libata-core.c 192.6 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/jiffies.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>

#include "libata.h"

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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
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static unsigned int ata_dev_set_feature(struct ata_device *dev,
					u8 enable, u8 feature);
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static void ata_dev_xfermask(struct ata_device *dev);
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static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
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unsigned int ata_print_id = 1;
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static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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int atapi_enabled = 1;
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module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");

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int atapi_dmadir = 0;
module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");

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int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");

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int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");

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static int ata_ignore_hpa;
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module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");

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static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
module_param_named(dma, libata_dma_mask, int, 0444);
MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");

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static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
module_param(ata_probe_timeout, int, 0444);
MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");

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int libata_noacpi = 0;
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module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@pmp: Port multiplier port
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 *	@is_cmd: This FIS is for command
 *	@fis: Buffer into which data will output
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 *
 *	Converts a standard ATA taskfile to a Serial ATA
 *	FIS structure (Register - Host to Device).
 *
 *	LOCKING:
 *	Inherited from caller.
 */
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void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
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{
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	fis[0] = 0x27;			/* Register - Host to Device FIS */
	fis[1] = pmp & 0xf;		/* Port multiplier number*/
	if (is_cmd)
		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */

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	fis[2] = tf->command;
	fis[3] = tf->feature;

	fis[4] = tf->lbal;
	fis[5] = tf->lbam;
	fis[6] = tf->lbah;
	fis[7] = tf->device;

	fis[8] = tf->hob_lbal;
	fis[9] = tf->hob_lbam;
	fis[10] = tf->hob_lbah;
	fis[11] = tf->hob_feature;

	fis[12] = tf->nsect;
	fis[13] = tf->hob_nsect;
	fis[14] = 0;
	fis[15] = tf->ctl;

	fis[16] = 0;
	fis[17] = 0;
	fis[18] = 0;
	fis[19] = 0;
}

/**
 *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
 *	@fis: Buffer from which data will be input
 *	@tf: Taskfile to output
 *
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 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
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 *
 *	LOCKING:
 *	Inherited from caller.
 */

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void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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{
	tf->command	= fis[2];	/* status */
	tf->feature	= fis[3];	/* error */

	tf->lbal	= fis[4];
	tf->lbam	= fis[5];
	tf->lbah	= fis[6];
	tf->device	= fis[7];

	tf->hob_lbal	= fis[8];
	tf->hob_lbam	= fis[9];
	tf->hob_lbah	= fis[10];

	tf->nsect	= fis[12];
	tf->hob_nsect	= fis[13];
}

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static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
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	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
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	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
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	0,
	0,
	0,
	0,
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	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
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	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
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};
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/**
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 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
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 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
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 *	Examine the device configuration and tf->flags to calculate
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 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
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static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
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{
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	u8 cmd;
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	int index, fua, lba48, write;
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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
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	}
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	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
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}

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/**
 *	ata_tf_read_block - Read block address from ATA taskfile
 *	@tf: ATA taskfile of interest
 *	@dev: ATA device @tf belongs to
 *
 *	LOCKING:
 *	None.
 *
 *	Read block address from @tf.  This function can handle all
 *	three address formats - LBA, LBA48 and CHS.  tf->protocol and
 *	flags select the address format to use.
 *
 *	RETURNS:
 *	Block address read from @tf.
 */
u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
{
	u64 block = 0;

	if (tf->flags & ATA_TFLAG_LBA) {
		if (tf->flags & ATA_TFLAG_LBA48) {
			block |= (u64)tf->hob_lbah << 40;
			block |= (u64)tf->hob_lbam << 32;
			block |= tf->hob_lbal << 24;
		} else
			block |= (tf->device & 0xf) << 24;

		block |= tf->lbah << 16;
		block |= tf->lbam << 8;
		block |= tf->lbal;
	} else {
		u32 cyl, head, sect;

		cyl = tf->lbam | (tf->lbah << 8);
		head = tf->device & 0xf;
		sect = tf->lbal;

		block = (cyl * dev->heads + head) * dev->sectors + sect;
	}

	return block;
}

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/**
 *	ata_build_rw_tf - Build ATA taskfile for given read/write request
 *	@tf: Target ATA taskfile
 *	@dev: ATA device @tf belongs to
 *	@block: Block address
 *	@n_block: Number of blocks
 *	@tf_flags: RW/FUA etc...
 *	@tag: tag
 *
 *	LOCKING:
 *	None.
 *
 *	Build ATA taskfile @tf for read/write request described by
 *	@block, @n_block, @tf_flags and @tag on @dev.
 *
 *	RETURNS:
 *
 *	0 on success, -ERANGE if the request is too large for @dev,
 *	-EINVAL if the request is invalid.
 */
int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
		    u64 block, u32 n_block, unsigned int tf_flags,
		    unsigned int tag)
{
	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf->flags |= tf_flags;

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	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
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		/* yay, NCQ */
		if (!lba_48_ok(block, n_block))
			return -ERANGE;

		tf->protocol = ATA_PROT_NCQ;
		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;

		if (tf->flags & ATA_TFLAG_WRITE)
			tf->command = ATA_CMD_FPDMA_WRITE;
		else
			tf->command = ATA_CMD_FPDMA_READ;

		tf->nsect = tag << 3;
		tf->hob_feature = (n_block >> 8) & 0xff;
		tf->feature = n_block & 0xff;

		tf->hob_lbah = (block >> 40) & 0xff;
		tf->hob_lbam = (block >> 32) & 0xff;
		tf->hob_lbal = (block >> 24) & 0xff;
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device = 1 << 6;
		if (tf->flags & ATA_TFLAG_FUA)
			tf->device |= 1 << 7;
	} else if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

		if (lba_28_ok(block, n_block)) {
			/* use LBA28 */
			tf->device |= (block >> 24) & 0xf;
		} else if (lba_48_ok(block, n_block)) {
			if (!(dev->flags & ATA_DFLAG_LBA48))
				return -ERANGE;

			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;

			tf->hob_nsect = (n_block >> 8) & 0xff;

			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
		} else
			/* request too large even for LBA48 */
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		tf->nsect = n_block & 0xff;

		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device |= ATA_LBA;
	} else {
		/* CHS */
		u32 sect, head, cyl, track;

		/* The request -may- be too large for CHS addressing. */
		if (!lba_28_ok(block, n_block))
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
			(u32)block, track, cyl, head, sect);

		/* Check whether the converted CHS can fit.
		   Cylinder: 0-65535
		   Head: 0-15
		   Sector: 1-255*/
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
			return -ERANGE;

		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
	}

	return 0;
}

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/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
static unsigned int ata_pack_xfermask(unsigned int pio_mask,
				      unsigned int mwdma_mask,
				      unsigned int udma_mask)
{
	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}

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/**
 *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 *	@xfer_mask: xfer_mask to unpack
 *	@pio_mask: resulting pio_mask
 *	@mwdma_mask: resulting mwdma_mask
 *	@udma_mask: resulting udma_mask
 *
 *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 *	Any NULL distination masks will be ignored.
 */
static void ata_unpack_xfermask(unsigned int xfer_mask,
				unsigned int *pio_mask,
				unsigned int *mwdma_mask,
				unsigned int *udma_mask)
{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

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static const struct ata_xfer_ent {
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	int shift, bits;
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	u8 base;
} ata_xfer_tbl[] = {
	{ ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching XFER_* value, 0 if no match found.
 */
static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
{
	int highbit = fls(xfer_mask) - 1;
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
			return ent->base + highbit - ent->shift;
	return 0;
}

/**
 *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_mask for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mask, 0 if no match found.
 */
static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
			return 1 << (ent->shift + xfer_mode - ent->base);
	return 0;
}

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
static int ata_xfer_mode2shift(unsigned int xfer_mode)
{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
			return ent->shift;
	return -1;
}

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/**
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 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
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 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
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 *	@mode_mask, or the constant C string "<n/a>".
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 */
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static const char *ata_mode_string(unsigned int xfer_mask)
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{
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	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
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		"PIO5",
		"PIO6",
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		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
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		"MWDMA3",
		"MWDMA4",
583 584 585 586 587 588 589 590 591
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
592
	int highbit;
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594 595 596
	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
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	return "<n/a>";
}

600 601 602 603 604 605 606 607 608 609 610 611
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
	};

	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
		return "<unknown>";
	return spd_str[spd - 1];
}

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void ata_dev_disable(struct ata_device *dev)
613
{
T
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	if (ata_dev_enabled(dev)) {
T
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615
		if (ata_msg_drv(dev->link->ap))
T
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			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
617 618
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
619 620 621 622
		dev->class++;
	}
}

623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
{
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
	u32 scontrol;
	unsigned int err_mask;
	int rc;

	/*
	 * disallow DIPM for drivers which haven't set
	 * ATA_FLAG_IPM.  This is because when DIPM is enabled,
	 * phy ready will be set in the interrupt status on
	 * state changes, which will cause some drivers to
	 * think there are errors - additionally drivers will
	 * need to disable hot plug.
	 */
	if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
		ap->pm_policy = NOT_AVAILABLE;
		return -EINVAL;
	}

	/*
	 * For DIPM, we will only enable it for the
	 * min_power setting.
	 *
	 * Why?  Because Disks are too stupid to know that
	 * If the host rejects a request to go to SLUMBER
	 * they should retry at PARTIAL, and instead it
	 * just would give up.  So, for medium_power to
	 * work at all, we need to only allow HIPM.
	 */
	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
	if (rc)
		return rc;

	switch (policy) {
	case MIN_POWER:
		/* no restrictions on IPM transitions */
		scontrol &= ~(0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

		/* enable DIPM */
		if (dev->flags & ATA_DFLAG_DIPM)
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_DIPM);
		break;
	case MEDIUM_POWER:
		/* allow IPM to PARTIAL */
		scontrol &= ~(0x1 << 8);
		scontrol |= (0x2 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

679 680 681 682 683
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
684 685 686 687 688 689 690 691 692
		break;
	case NOT_AVAILABLE:
	case MAX_PERFORMANCE:
		/* disable all IPM transitions */
		scontrol |= (0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

693 694 695 696 697
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
698 699 700 701 702 703 704 705 706 707 708
		break;
	}

	/* FIXME: handle SET FEATURES failure */
	(void) err_mask;

	return 0;
}

/**
 *	ata_dev_enable_pm - enable SATA interface power management
S
Stephen Hemminger 已提交
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 *	@dev:  device to enable power management
 *	@policy: the link power management policy
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
 *
 *	Enable SATA Interface power management.  This will enable
 *	Device Interface Power Management (DIPM) for min_power
 * 	policy, and then call driver specific callbacks for
 *	enabling Host Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: -EINVAL if IPM is not supported, 0 otherwise.
 */
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
{
	int rc = 0;
	struct ata_port *ap = dev->link->ap;

	/* set HIPM first, then DIPM */
	if (ap->ops->enable_pm)
		rc = ap->ops->enable_pm(ap, policy);
	if (rc)
		goto enable_pm_out;
	rc = ata_dev_set_dipm(dev, policy);

enable_pm_out:
	if (rc)
		ap->pm_policy = MAX_PERFORMANCE;
	else
		ap->pm_policy = policy;
	return /* rc */;	/* hopefully we can use 'rc' eventually */
}

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740
#ifdef CONFIG_PM
741 742
/**
 *	ata_dev_disable_pm - disable SATA interface power management
S
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743
 *	@dev: device to disable power management
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760
 *
 *	Disable SATA Interface power management.  This will disable
 *	Device Interface Power Management (DIPM) without changing
 * 	policy,  call driver specific callbacks for disabling Host
 * 	Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: void
 */
static void ata_dev_disable_pm(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	ata_dev_set_dipm(dev, MAX_PERFORMANCE);
	if (ap->ops->disable_pm)
		ap->ops->disable_pm(ap);
}
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#endif	/* CONFIG_PM */
762 763 764 765 766 767 768 769 770

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
	ap->link.eh_info.action |= ATA_EHI_LPM;
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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#ifdef CONFIG_PM
772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
static void ata_lpm_enable(struct ata_host *host)
{
	struct ata_link *link;
	struct ata_port *ap;
	struct ata_device *dev;
	int i;

	for (i = 0; i < host->n_ports; i++) {
		ap = host->ports[i];
		ata_port_for_each_link(link, ap) {
			ata_link_for_each_dev(dev, link)
				ata_dev_disable_pm(dev);
		}
	}
}

static void ata_lpm_disable(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		ata_lpm_schedule(ap, ap->pm_policy);
	}
}
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#endif	/* CONFIG_PM */
798 799


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/**
T
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801
 *	ata_devchk - PATA device presence detection
L
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802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
 *
 *	This technique was originally described in
 *	Hale Landis's ATADRVR (www.ata-atapi.com), and
 *	later found its way into the ATA/ATAPI spec.
 *
 *	Write a pattern to the ATA shadow registers,
 *	and if a device is present, it will respond by
 *	correctly storing and echoing back the
 *	ATA shadow register contents.
 *
 *	LOCKING:
 *	caller.
 */

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static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
L
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819 820 821 822 823 824
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

	ap->ops->dev_select(ap, device);

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	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
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827

T
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828 829
	iowrite8(0xaa, ioaddr->nsect_addr);
	iowrite8(0x55, ioaddr->lbal_addr);
L
Linus Torvalds 已提交
830

T
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831 832
	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
L
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834 835
	nsect = ioread8(ioaddr->nsect_addr);
	lbal = ioread8(ioaddr->lbal_addr);
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836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_dev_classify - determine device type based on ATA-spec signature
 *	@tf: ATA taskfile register set for device to be identified
 *
 *	Determine from taskfile register contents whether a device is
 *	ATA or ATAPI, as per "Signature and persistence" section
 *	of ATA/PI spec (volume 1, sect 5.14).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
855 856
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
J
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
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859 860 861 862
{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
863 864 865 866 867 868 869 870 871 872 873 874 875 876
	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
L
Linus Torvalds 已提交
877
	 */
878
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
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879 880 881 882
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

883
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
L
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884 885 886 887
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

888 889 890 891 892 893
	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
		DPRINTK("found PMP device by sig\n");
		return ATA_DEV_PMP;
	}

	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
894
		printk(KERN_INFO "ata: SEMB device ignored\n");
895 896 897
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

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898 899 900 901 902 903
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
904 905
 *	@dev: ATA device to classify (starting at zero)
 *	@present: device seems present
906
 *	@r_err: Value of error register on completion
L
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
919 920 921
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
L
Linus Torvalds 已提交
922
 */
923 924
unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
				  u8 *r_err)
L
Linus Torvalds 已提交
925
{
926
	struct ata_port *ap = dev->link->ap;
L
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927 928 929 930
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

931
	ap->ops->dev_select(ap, dev->devno);
L
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932 933 934 935

	memset(&tf, 0, sizeof(tf));

	ap->ops->tf_read(ap, &tf);
936
	err = tf.feature;
937 938
	if (r_err)
		*r_err = err;
L
Linus Torvalds 已提交
939

940
	/* see if device passed diags: if master then continue and warn later */
941
	if (err == 0 && dev->devno == 0)
942
		/* diagnostic fail : do nothing _YET_ */
943
		dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
944
	else if (err == 1)
L
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945
		/* do nothing */ ;
946
	else if ((dev->devno == 0) && (err == 0x81))
L
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947 948
		/* do nothing */ ;
	else
949
		return ATA_DEV_NONE;
L
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950

951
	/* determine if device is ATA or ATAPI */
L
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952
	class = ata_dev_classify(&tf);
953

954 955 956 957 958 959 960 961 962 963 964 965 966 967
	if (class == ATA_DEV_UNKNOWN) {
		/* If the device failed diagnostic, it's likely to
		 * have reported incorrect device signature too.
		 * Assume ATA device if the device seems present but
		 * device signature is invalid with diagnostic
		 * failure.
		 */
		if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
			class = ATA_DEV_ATA;
		else
			class = ATA_DEV_NONE;
	} else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
		class = ATA_DEV_NONE;

968
	return class;
L
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969 970 971
}

/**
972
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
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973 974 975 976 977 978 979 980 981 982 983 984 985
 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an even number.
 *
 *	The strings in the IDENTIFY DEVICE page are broken up into
 *	16-bit chunks.  Run through the string, and output each
 *	8-bit chunk linearly, regardless of platform.
 *
 *	LOCKING:
 *	caller.
 */

986 987
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
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988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
{
	unsigned int c;

	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

		c = id[ofs] & 0xff;
		*s = c;
		s++;

		ofs++;
		len -= 2;
	}
}

1005
/**
1006
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1007 1008 1009 1010 1011
 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an odd number.
 *
1012
 *	This function is identical to ata_id_string except that it
1013 1014 1015 1016 1017 1018
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1019 1020
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1021 1022 1023 1024 1025
{
	unsigned char *p;

	WARN_ON(!(len & 1));

1026
	ata_id_string(id, s, ofs, len - 1);
1027 1028 1029 1030 1031 1032

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
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T
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1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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Alan Cox 已提交
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075
static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
	sectors |= (tf->hob_lbal & 0xff) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

	return ++sectors;
}

static u64 ata_tf_to_lba(struct ata_taskfile *tf)
{
	u64 sectors = 0;

	sectors |= (tf->device & 0x0f) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

	return ++sectors;
}

/**
1076 1077 1078
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
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1079
 *
1080 1081
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
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1082
 *
1083 1084 1085
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
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1086
 */
1087
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1088
{
1089
	unsigned int err_mask;
A
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1090
	struct ata_taskfile tf;
1091
	int lba48 = ata_id_has_lba48(dev->id);
A
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1092 1093 1094

	ata_tf_init(dev, &tf);

1095
	/* always clear all address registers */
A
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1096 1097
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1098 1099 1100 1101 1102
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
Alan Cox 已提交
1103 1104

	tf.protocol |= ATA_PROT_NODATA;
1105 1106
	tf.device |= ATA_LBA;

1107
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1108 1109 1110 1111 1112 1113 1114
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
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1115

1116 1117 1118 1119
	if (lba48)
		*max_sectors = ata_tf_to_lba48(&tf);
	else
		*max_sectors = ata_tf_to_lba(&tf);
1120
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1121
		(*max_sectors)--;
1122
	return 0;
A
Alan Cox 已提交
1123 1124 1125
}

/**
1126 1127
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1128
 *	@new_sectors: new max sectors value to set for the device
A
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1129
 *
1130 1131 1132 1133 1134 1135
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
Alan Cox 已提交
1136
 */
T
Tejun Heo 已提交
1137
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1138
{
1139
	unsigned int err_mask;
A
Alan Cox 已提交
1140
	struct ata_taskfile tf;
1141
	int lba48 = ata_id_has_lba48(dev->id);
A
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	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1148 1149 1150 1151 1152 1153 1154 1155

	if (lba48) {
		tf.command = ATA_CMD_SET_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
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	} else {
1157 1158
		tf.command = ATA_CMD_SET_MAX;

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		tf.device |= (new_sectors >> 24) & 0xf;
	}

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	tf.protocol |= ATA_PROT_NODATA;
1163
	tf.device |= ATA_LBA;
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	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;

1169
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
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}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
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 *
 *	RETURNS:
 *	0 on success, -errno on failure.
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 */
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static int ata_hpa_resize(struct ata_device *dev)
A
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{
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	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1199
	int rc;
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	/* do we need to do it? */
	if (dev->class != ATA_DEV_ATA ||
	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1205
		return 0;
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	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
		/* If HPA isn't going to be unlocked, skip HPA
		 * resizing from the next try.
		 */
		if (!ata_ignore_hpa) {
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
				       "broken, will skip HPA handling\n");
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
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		}
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		return rc;
	}

	/* nothing to do? */
	if (native_sectors <= sectors || !ata_ignore_hpa) {
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
			ata_dev_printk(dev, KERN_INFO,
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
			ata_dev_printk(dev, KERN_WARNING,
				"native sectors (%llu) is smaller than "
				"sectors (%llu)\n",
				(unsigned long long)native_sectors,
				(unsigned long long)sectors);
		return 0;
	}

	/* let's unlock HPA */
	rc = ata_set_max_sectors(dev, native_sectors);
	if (rc == -EACCES) {
		/* if device aborted the command, skip HPA resizing */
		ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
			       "(%llu -> %llu), skipping HPA handling\n",
			       (unsigned long long)sectors,
			       (unsigned long long)native_sectors);
		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
		return 0;
	} else if (rc)
		return rc;

	/* re-read IDENTIFY data */
	rc = ata_dev_reread_id(dev, 0);
	if (rc) {
		ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
			       "data after HPA resizing\n");
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
		ata_dev_printk(dev, KERN_INFO,
			"HPA unlocked: %llu -> %llu, native %llu\n",
			(unsigned long long)sectors,
			(unsigned long long)new_sectors,
			(unsigned long long)native_sectors);
	}

	return 0;
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}

1278 1279 1280
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
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 *	@unknown: mode to assume if we cannot tell
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319
 *
 *	Set up the timing values for the device based upon the identify
 *	reported values for the DMA mode. This function is used by drivers
 *	which rely upon firmware configured modes, but wish to report the
 *	mode correctly when possible.
 *
 *	In addition we emit similarly formatted messages to the default
 *	ata_dev_set_mode handler, in order to provide consistency of
 *	presentation.
 */

void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
{
	unsigned int mask;
	u8 mode;

	/* Pack the DMA modes */
	mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
	if (dev->id[53] & 0x04)
		mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;

	/* Select the mode in use */
	mode = ata_xfer_mask2mode(mask);

	if (mode != 0) {
		ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(mask));
	} else {
		/* SWDMA perhaps ? */
		mode = unknown;
		ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
	}

	/* Configure the device reporting */
	dev->xfer_mode = mode;
	dev->xfer_shift = ata_xfer_mode2shift(mode);
}

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/**
 *	ata_noop_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *
 *	This function performs no actual function.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
 *
 *	LOCKING:
 *	caller.
 */
1332
void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
L
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{
}

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L
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/**
 *	ata_std_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *
 *	Use the method defined in the ATA specification to
 *	make either device 0, or device 1, active on the
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 *	ATA channel.  Works with both PIO and MMIO.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
L
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 *
 *	LOCKING:
 *	caller.
 */

1352
void ata_std_dev_select(struct ata_port *ap, unsigned int device)
L
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{
	u8 tmp;

	if (device == 0)
		tmp = ATA_DEVICE_OBS;
	else
		tmp = ATA_DEVICE_OBS | ATA_DEV1;

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	iowrite8(tmp, ap->ioaddr.device_addr);
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	ata_pause(ap);		/* needed; also flushes, for mmio */
}

/**
 *	ata_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *	@wait: non-zero to wait for Status register BSY bit to clear
 *	@can_sleep: non-zero if context allows sleeping
 *
 *	Use the method defined in the ATA specification to
 *	make either device 0, or device 1, active on the
 *	ATA channel.
 *
 *	This is a high-level version of ata_std_dev_select(),
 *	which additionally provides the services of inserting
 *	the proper pauses and status polling, where needed.
 *
 *	LOCKING:
 *	caller.
 */

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
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	if (ata_msg_probe(ap))
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		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
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	if (wait)
		ata_wait_idle(ap);

	ap->ops->dev_select(ap, device);

	if (wait) {
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		if (can_sleep && ap->link.device[device].class == ATA_DEV_ATAPI)
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			msleep(150);
		ata_wait_idle(ap);
	}
}

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1405
 *	@id: IDENTIFY DEVICE page to dump
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Linus Torvalds 已提交
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 *
1407 1408
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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1409 1410 1411 1412 1413
 *
 *	LOCKING:
 *	caller.
 */

1414
static inline void ata_dump_id(const u16 *id)
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{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1421 1422 1423 1424 1425
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1431 1432 1433 1434 1435
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1438 1439
		id[88],
		id[93]);
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}

1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
static unsigned int ata_id_xfermask(const u16 *id)
{
	unsigned int pio_mask, mwdma_mask, udma_mask;

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1471
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1472
		if (mode < 5)	/* Valid PIO range */
1473
			pio_mask = (2 << mode) - 1;
1474 1475
		else
			pio_mask = 1;
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485

		/* But wait.. there's more. Design your standards by
		 * committee and you too can get a free iordy field to
		 * process. However its the speeds not the modes that
		 * are supported... Note drivers using the timing API
		 * will get this right anyway
		 */
	}

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1486

1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
		int pio = id[163] & 0x7;
		int dma = (id[163] >> 3) & 7;

		if (pio)
			pio_mask |= (1 << 5);
		if (pio > 1)
			pio_mask |= (1 << 6);
		if (dma)
			mwdma_mask |= (1 << 3);
		if (dma > 1)
			mwdma_mask |= (1 << 4);
	}

1504 1505 1506
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1507 1508 1509 1510

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1514
 *	@fn: workqueue function to be scheduled
1515
 *	@data: data for @fn to use
1516
 *	@delay: delay time for workqueue function
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 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
 *	port_task and EH.  ata_port_queue_task() may be ignored for EH
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
1530
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
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			 unsigned long delay)
{
1533 1534
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
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1536 1537
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
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}

/**
 *	ata_port_flush_task - Flush port_task
 *	@ap: The ata_port to flush port_task for
 *
 *	After this function completes, port_task is guranteed not to
 *	be running or scheduled.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
void ata_port_flush_task(struct ata_port *ap)
{
	DPRINTK("ENTER\n");

1554
	cancel_rearming_delayed_work(&ap->port_task);
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1556 1557
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
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}

1560
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1561
{
1562
	struct completion *waiting = qc->private_data;
1563 1564 1565 1566 1567

	complete(waiting);
}

/**
1568
 *	ata_exec_internal_sg - execute libata internal command
1569 1570
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1571
 *	@cdb: CDB for packet command
1572
 *	@dma_dir: Data tranfer direction of the command
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Randy Dunlap 已提交
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 *	@sgl: sg list for the data buffer of the command
1574
 *	@n_elem: Number of sg entries
1575
 *	@timeout: Timeout in msecs (0 for default)
1576 1577 1578 1579 1580 1581 1582 1583 1584
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1585 1586 1587
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1588
 */
1589 1590
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
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1591
			      int dma_dir, struct scatterlist *sgl,
1592
			      unsigned int n_elem, unsigned long timeout)
1593
{
T
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1594 1595
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1596 1597
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1598
	unsigned int tag, preempted_tag;
1599
	u32 preempted_sactive, preempted_qc_active;
1600
	int preempted_nr_active_links;
1601
	DECLARE_COMPLETION_ONSTACK(wait);
1602
	unsigned long flags;
1603
	unsigned int err_mask;
1604
	int rc;
1605

1606
	spin_lock_irqsave(ap->lock, flags);
1607

1608
	/* no internal command while frozen */
1609
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1610
		spin_unlock_irqrestore(ap->lock, flags);
1611 1612 1613
		return AC_ERR_SYSTEM;
	}

1614
	/* initialize internal qc */
1615

1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

1626
	if (test_and_set_bit(tag, &ap->qc_allocated))
1627
		BUG();
1628
	qc = __ata_qc_from_tag(ap, tag);
1629 1630 1631 1632 1633 1634 1635

	qc->tag = tag;
	qc->scsicmd = NULL;
	qc->ap = ap;
	qc->dev = dev;
	ata_qc_reinit(qc);

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1636 1637
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1638
	preempted_qc_active = ap->qc_active;
1639
	preempted_nr_active_links = ap->nr_active_links;
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1640 1641
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1642
	ap->qc_active = 0;
1643
	ap->nr_active_links = 0;
1644 1645

	/* prepare & issue qc */
1646
	qc->tf = *tf;
1647 1648
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1649
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1650 1651
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1652
		unsigned int i, buflen = 0;
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1653
		struct scatterlist *sg;
1654

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1655 1656
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1657

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1658
		ata_sg_init(qc, sgl, n_elem);
1659
		qc->nbytes = buflen;
1660 1661
	}

1662
	qc->private_data = &wait;
1663 1664
	qc->complete_fn = ata_qc_complete_internal;

1665
	ata_qc_issue(qc);
1666

1667
	spin_unlock_irqrestore(ap->lock, flags);
1668

1669 1670 1671 1672
	if (!timeout)
		timeout = ata_probe_timeout * 1000 / HZ;

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1673 1674

	ata_port_flush_task(ap);
1675

1676
	if (!rc) {
1677
		spin_lock_irqsave(ap->lock, flags);
1678 1679 1680

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1681 1682
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1683
		 */
1684
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1685 1686 1687 1688 1689 1690
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1691

1692 1693
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
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1694
					"qc timeout (cmd 0x%x)\n", command);
1695 1696
		}

1697
		spin_unlock_irqrestore(ap->lock, flags);
1698 1699
	}

1700 1701 1702 1703
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

		if (!qc->err_mask)
			qc->err_mask |= AC_ERR_OTHER;

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1714 1715
	}

1716
	/* finish up */
1717
	spin_lock_irqsave(ap->lock, flags);
1718

1719
	*tf = qc->result_tf;
1720 1721 1722
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1723 1724
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1725
	ap->qc_active = preempted_qc_active;
1726
	ap->nr_active_links = preempted_nr_active_links;
1727

1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1739
	if (ap->flags & ATA_FLAG_DISABLED) {
1740 1741 1742 1743
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1744
	spin_unlock_irqrestore(ap->lock, flags);
1745

1746
	return err_mask;
1747 1748
}

1749
/**
1750
 *	ata_exec_internal - execute libata internal command
1751 1752 1753 1754 1755 1756
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
1757
 *	@timeout: Timeout in msecs (0 for default)
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
1770 1771
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1772
{
1773 1774
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1775

1776 1777 1778 1779 1780 1781
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1782

1783 1784
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1785 1786
}

1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1800
 */
1801
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1802 1803 1804 1805 1806 1807 1808 1809 1810
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = cmd;
	tf.flags |= ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;

1811
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1812 1813
}

1814 1815 1816 1817 1818 1819 1820
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
J
Jeff Garzik 已提交
1821

1822 1823
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1824 1825
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1826
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1827
		return 0;
A
Alan Cox 已提交
1828 1829 1830 1831 1832
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1833
		return 1;
A
Alan Cox 已提交
1834 1835
	return 0;
}
1836

A
Alan Cox 已提交
1837 1838 1839 1840 1841 1842 1843
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
J
Jeff Garzik 已提交
1844

A
Alan Cox 已提交
1845 1846
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1847 1848
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1849
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1850 1851 1852 1853
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1854 1855
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1856 1857
		}
	}
A
Alan Cox 已提交
1858
	return 3 << ATA_SHIFT_PIO;
1859 1860
}

L
Linus Torvalds 已提交
1861
/**
1862 1863 1864
 *	ata_dev_read_id - Read ID data from the specified device
 *	@dev: target device
 *	@p_class: pointer to class of the target device (may be changed)
1865
 *	@flags: ATA_READID_* flags
1866
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1867
 *
1868 1869
 *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
 *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
T
Tejun Heo 已提交
1870 1871
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1872
 *
1873
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1874
 *	now we abort if we hit that case.
1875
 *
L
Linus Torvalds 已提交
1876
 *	LOCKING:
1877 1878 1879 1880
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1881
 */
1882
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1883
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1884
{
T
Tejun Heo 已提交
1885
	struct ata_port *ap = dev->link->ap;
1886
	unsigned int class = *p_class;
1887
	struct ata_taskfile tf;
1888 1889
	unsigned int err_mask = 0;
	const char *reason;
1890
	int may_fallback = 1, tried_spinup = 0;
1891
	int rc;
L
Linus Torvalds 已提交
1892

1893
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1894
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1895

1896 1897
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1898
	ata_tf_init(dev, &tf);
1899

1900 1901
	switch (class) {
	case ATA_DEV_ATA:
1902
		tf.command = ATA_CMD_ID_ATA;
1903 1904
		break;
	case ATA_DEV_ATAPI:
1905
		tf.command = ATA_CMD_ID_ATAPI;
1906 1907 1908 1909 1910
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1911 1912
	}

1913
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1914 1915 1916 1917 1918 1919 1920 1921 1922 1923

	/* Some devices choke if TF registers contain garbage.  Make
	 * sure those are properly initialized.
	 */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1924

T
Tejun Heo 已提交
1925
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1926
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1927
	if (err_mask) {
1928
		if (err_mask & AC_ERR_NODEV_HINT) {
1929
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1930
				ap->print_id, dev->devno);
1931 1932 1933
			return -ENOENT;
		}

1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948
		/* Device or controller might have reported the wrong
		 * device class.  Give a shot at the other IDENTIFY if
		 * the current one is aborted by the device.
		 */
		if (may_fallback &&
		    (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			may_fallback = 0;

			if (class == ATA_DEV_ATA)
				class = ATA_DEV_ATAPI;
			else
				class = ATA_DEV_ATA;
			goto retry;
		}

1949 1950
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1951 1952 1953
		goto err_out;
	}

1954 1955 1956 1957 1958
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1959
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1960

1961
	/* sanity check */
1962
	rc = -EINVAL;
A
Alan Cox 已提交
1963
	reason = "device reports invalid type";
1964 1965 1966 1967 1968 1969 1970

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1971 1972
	}

1973 1974 1975 1976 1977 1978 1979
	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
		tried_spinup = 1;
		/*
		 * Drive powered-up in standby mode, and requires a specific
		 * SET_FEATURES spin-up subcommand before it will accept
		 * anything other than the original IDENTIFY command.
		 */
1980
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1981
		if (err_mask && id[2] != 0x738c) {
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
			rc = -EIO;
			reason = "SPINUP failed";
			goto err_out;
		}
		/*
		 * If the drive initially returned incomplete IDENTIFY info,
		 * we now must reissue the IDENTIFY command.
		 */
		if (id[2] == 0x37c8)
			goto retry;
	}

1994
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1995 1996 1997
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
1998 1999
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2000 2001
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2002 2003 2004
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2005 2006
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2007
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2008 2009 2010 2011 2012 2013 2014 2015 2016
			if (err_mask) {
				rc = -EIO;
				reason = "INIT_DEV_PARAMS failed";
				goto err_out;
			}

			/* current CHS translation info (id[53-58]) might be
			 * changed. reread the identify device info.
			 */
2017
			flags &= ~ATA_READID_POSTRESET;
2018 2019 2020 2021 2022
			goto retry;
		}
	}

	*p_class = class;
2023

2024 2025 2026
	return 0;

 err_out:
T
Tejun Heo 已提交
2027
	if (ata_msg_warn(ap))
2028
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2029
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2030 2031 2032
	return rc;
}

T
Tejun Heo 已提交
2033
static inline u8 ata_dev_knobble(struct ata_device *dev)
2034
{
T
Tejun Heo 已提交
2035 2036
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2037 2038
}

2039 2040 2041
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2042
	struct ata_port *ap = dev->link->ap;
2043 2044 2045 2046 2047 2048
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
T
Tejun Heo 已提交
2049
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2050 2051 2052
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2053
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2054
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2055 2056 2057 2058 2059 2060 2061 2062 2063
		dev->flags |= ATA_DFLAG_NCQ;
	}

	if (hdepth >= ddepth)
		snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
	else
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
}

2064
/**
2065 2066 2067 2068 2069
 *	ata_dev_configure - Configure the specified ATA/ATAPI device
 *	@dev: Target device to configure
 *
 *	Configure @dev according to @dev->id.  Generic and low-level
 *	driver specific fixups are also applied.
2070 2071
 *
 *	LOCKING:
2072 2073 2074 2075
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2076
 */
2077
int ata_dev_configure(struct ata_device *dev)
2078
{
T
Tejun Heo 已提交
2079 2080
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2081
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2082
	const u16 *id = dev->id;
2083
	unsigned int xfer_mask;
2084
	char revbuf[7];		/* XYZ-99\0 */
2085 2086
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2087
	int rc;
2088

2089
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2090 2091
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
2092
		return 0;
2093 2094
	}

2095
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2096
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
2097

T
Tejun Heo 已提交
2098 2099 2100
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
2101 2102 2103 2104
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2105

T
Tejun Heo 已提交
2106 2107 2108 2109 2110
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2111
	/* print device capabilities */
2112
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2113 2114 2115
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
2116
			       __FUNCTION__,
2117 2118
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2119

2120
	/* initialize to-be-configured parameters */
2121
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2122 2123 2124 2125 2126 2127 2128
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
2129 2130 2131 2132
	/*
	 * common ATA, ATAPI feature tests
	 */

2133
	/* find max transfer mode; for printk only */
2134
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2135

2136 2137
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2138

2139 2140 2141 2142 2143 2144 2145
	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
			sizeof(fwrevbuf));

	ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
			sizeof(modelbuf));

L
Linus Torvalds 已提交
2146 2147
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2148 2149
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
2150 2151 2152
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2153
			snprintf(revbuf, 7, "CFA");
2154 2155
		} else
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2156

2157
		dev->n_sectors = ata_id_n_sectors(id);
2158

2159 2160 2161
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

2162
		if (ata_id_has_lba(id)) {
2163
			const char *lba_desc;
2164
			char ncq_desc[20];
2165

2166 2167
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2168
			if (ata_id_has_lba48(id)) {
2169
				dev->flags |= ATA_DFLAG_LBA48;
2170
				lba_desc = "LBA48";
2171 2172 2173 2174

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2175
			}
2176

2177 2178 2179
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2180
			/* print device info to dmesg */
2181 2182 2183 2184 2185 2186 2187
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
2188
					(unsigned long long)dev->n_sectors,
2189 2190
					dev->multi_count, lba_desc, ncq_desc);
			}
2191
		} else {
2192 2193 2194
			/* CHS */

			/* Default translation */
2195 2196 2197
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2198

2199
			if (ata_id_current_chs_valid(id)) {
2200
				/* Current CHS translation is valid. */
2201 2202 2203
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2204 2205 2206
			}

			/* print device info to dmesg */
2207
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2208
				ata_dev_printk(dev, KERN_INFO,
2209 2210 2211
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2212
				ata_dev_printk(dev, KERN_INFO,
2213 2214 2215 2216 2217
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2218 2219
		}

2220
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2221 2222 2223
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2224
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2225 2226
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2227
		u32 sntf;
2228

2229
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2230
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2231
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2232 2233
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2234
			rc = -EINVAL;
L
Linus Torvalds 已提交
2235 2236
			goto err_out_nosup;
		}
2237
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2238

2239 2240 2241 2242
		/* Enable ATAPI AN if both the host and device have
		 * the support.  If PMP is attached, SNTF is required
		 * to enable ATAPI AN to discern between PHY status
		 * changed notifications and ATAPI ANs.
2243
		 */
2244 2245 2246
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
		    (!ap->nr_pmp_links ||
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2247 2248
			unsigned int err_mask;

2249
			/* issue SET feature command to turn this on */
2250 2251
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2252
			if (err_mask)
2253
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2254 2255 2256
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2257
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2258 2259
				atapi_an_string = ", ATAPI AN";
			}
2260 2261
		}

2262
		if (ata_id_cdb_intr(dev->id)) {
2263
			dev->flags |= ATA_DFLAG_CDB_INTR;
2264 2265
			cdb_intr_string = ", CDB intr";
		}
2266

L
Linus Torvalds 已提交
2267
		/* print device info to dmesg */
2268
		if (ata_msg_drv(ap) && print_info)
2269
			ata_dev_printk(dev, KERN_INFO,
T
Tejun Heo 已提交
2270
				       "ATAPI: %s, %s, max %s%s%s\n",
2271
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2272
				       ata_mode_string(xfer_mask),
T
Tejun Heo 已提交
2273
				       cdb_intr_string, atapi_an_string);
L
Linus Torvalds 已提交
2274 2275
	}

2276 2277 2278 2279 2280
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2281 2282 2283 2284 2285 2286 2287
	if (!(dev->horkage & ATA_HORKAGE_IPM)) {
		if (ata_id_has_hipm(dev->id))
			dev->flags |= ATA_DFLAG_HIPM;
		if (ata_id_has_dipm(dev->id))
			dev->flags |= ATA_DFLAG_DIPM;
	}

2288 2289 2290 2291
	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
		/* Let the user know. We don't want to disallow opens for
		   rescue purposes, or in case the vendor is just a blithering
		   idiot */
2292
		if (print_info) {
2293 2294 2295 2296 2297 2298 2299
			ata_dev_printk(dev, KERN_WARNING,
"Drive reports diagnostics failure. This may indicate a drive\n");
			ata_dev_printk(dev, KERN_WARNING,
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2300
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2301
	if (ata_dev_knobble(dev)) {
2302
		if (ata_msg_drv(ap) && print_info)
2303 2304
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2305
		dev->udma_mask &= ATA_UDMA5;
2306 2307 2308
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2309 2310 2311 2312
	if ((dev->class == ATA_DEV_ATAPI) &&
	    (atapi_command_packet_set(id) == TYPE_TAPE))
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;

T
Tejun Heo 已提交
2313
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2314 2315
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2316

2317 2318 2319 2320 2321 2322 2323
	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
		dev->horkage |= ATA_HORKAGE_IPM;

		/* reset link pm_policy for this port to no pm */
		ap->pm_policy = MAX_PERFORMANCE;
	}

2324
	if (ap->ops->dev_config)
2325
		ap->ops->dev_config(dev);
2326

2327 2328 2329
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2330
	return 0;
L
Linus Torvalds 已提交
2331 2332

err_out_nosup:
2333
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2334 2335
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2336
	return rc;
L
Linus Torvalds 已提交
2337 2338
}

A
Alan Cox 已提交
2339
/**
2340
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2341 2342
 *	@ap: port
 *
2343
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2344 2345 2346 2347 2348 2349 2350 2351 2352
 *	detection.
 */

int ata_cable_40wire(struct ata_port *ap)
{
	return ATA_CBL_PATA40;
}

/**
2353
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2354 2355
 *	@ap: port
 *
2356
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
 *	detection.
 */

int ata_cable_80wire(struct ata_port *ap)
{
	return ATA_CBL_PATA80;
}

/**
 *	ata_cable_unknown	-	return unknown PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which have no PATA cable detection.
 */

int ata_cable_unknown(struct ata_port *ap)
{
	return ATA_CBL_PATA_UNK;
}

/**
 *	ata_cable_sata	-	return SATA cable type
 *	@ap: port
 *
 *	Helper method for drivers which have SATA cables
 */

int ata_cable_sata(struct ata_port *ap)
{
	return ATA_CBL_SATA;
}

L
Linus Torvalds 已提交
2389 2390 2391 2392
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2393 2394 2395 2396
 *	Master ATA bus probing function.  Initiates a hardware-dependent
 *	bus reset, then attempts to identify any devices found on
 *	the bus.
 *
L
Linus Torvalds 已提交
2397
 *	LOCKING:
J
Jeff Garzik 已提交
2398
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2399 2400
 *
 *	RETURNS:
2401
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2402 2403
 */

2404
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2405
{
2406
	unsigned int classes[ATA_MAX_DEVICES];
2407
	int tries[ATA_MAX_DEVICES];
2408
	int rc;
2409
	struct ata_device *dev;
L
Linus Torvalds 已提交
2410

2411
	ata_port_probe(ap);
2412

2413 2414
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2415 2416

 retry:
T
Tejun Heo 已提交
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435
	ata_link_for_each_dev(dev, &ap->link) {
		/* If we issue an SRST then an ATA drive (not ATAPI)
		 * may change configuration and be in PIO0 timing. If
		 * we do a hard reset (or are coming from power on)
		 * this is true for ATA or ATAPI. Until we've set a
		 * suitable controller mode we should not touch the
		 * bus as we may be talking too fast.
		 */
		dev->pio_mode = XFER_PIO_0;

		/* If the controller has a pio mode setup function
		 * then use it to set the chipset to rights. Don't
		 * touch the DMA setup as that will be dealt with when
		 * configuring devices.
		 */
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}

2436
	/* reset and determine device classes */
2437
	ap->ops->phy_reset(ap);
2438

2439
	ata_link_for_each_dev(dev, &ap->link) {
2440 2441 2442 2443 2444
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2445

2446
		dev->class = ATA_DEV_UNKNOWN;
2447
	}
L
Linus Torvalds 已提交
2448

2449
	ata_port_probe(ap);
2450

2451 2452 2453 2454
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

2455 2456 2457
	ata_link_for_each_dev(dev, &ap->link) {
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2458

2459
		if (!ata_dev_enabled(dev))
2460 2461
			continue;

2462 2463
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2464 2465
		if (rc)
			goto fail;
2466 2467
	}

A
Alan Cox 已提交
2468 2469 2470 2471
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

A
Alan Cox 已提交
2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482
	/* We may have SATA bridge glue hiding here irrespective of the
	   reported cable types and sensed types */
	ata_link_for_each_dev(dev, &ap->link) {
		if (!ata_dev_enabled(dev))
			continue;
		/* SATA drives indicate we have a bridge. We don't know which
		   end of the link the bridge is which is a problem */
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;
	}

2483 2484 2485
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

2486
	ata_link_for_each_dev(dev, &ap->link) {
2487 2488
		if (!ata_dev_enabled(dev))
			continue;
2489

T
Tejun Heo 已提交
2490
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2491
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2492
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2493 2494
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2495 2496
	}

2497
	/* configure transfer mode */
2498
	rc = ata_set_mode(&ap->link, &dev);
2499
	if (rc)
2500
		goto fail;
L
Linus Torvalds 已提交
2501

2502 2503
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2504
			return 0;
L
Linus Torvalds 已提交
2505

2506 2507
	/* no device present, disable port */
	ata_port_disable(ap);
2508
	return -ENODEV;
2509 2510

 fail:
2511 2512
	tries[dev->devno]--;

2513 2514
	switch (rc) {
	case -EINVAL:
2515
		/* eeek, something went very wrong, give up */
2516 2517
		tries[dev->devno] = 0;
		break;
2518 2519 2520 2521

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2522
	case -EIO:
2523 2524 2525 2526
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2527
			sata_down_spd_limit(&ap->link);
2528 2529
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2530 2531
	}

2532
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2533
		ata_dev_disable(dev);
2534

2535
	goto retry;
L
Linus Torvalds 已提交
2536 2537 2538
}

/**
J
Jeff Garzik 已提交
2539 2540
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2541
 *
J
Jeff Garzik 已提交
2542 2543 2544
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2545
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2546
 *	serialization.
L
Linus Torvalds 已提交
2547 2548 2549 2550
 */

void ata_port_probe(struct ata_port *ap)
{
2551
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2552 2553
}

2554 2555
/**
 *	sata_print_link_status - Print SATA link status
2556
 *	@link: SATA link to printk link status about
2557 2558 2559 2560 2561 2562
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2563
void sata_print_link_status(struct ata_link *link)
2564
{
2565
	u32 sstatus, scontrol, tmp;
2566

2567
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2568
		return;
2569
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2570

2571
	if (ata_link_online(link)) {
2572
		tmp = (sstatus >> 4) & 0xf;
2573
		ata_link_printk(link, KERN_INFO,
2574 2575
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2576
	} else {
2577
		ata_link_printk(link, KERN_INFO,
2578 2579
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2580 2581 2582
	}
}

L
Linus Torvalds 已提交
2583
/**
J
Jeff Garzik 已提交
2584 2585
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2586
 *
J
Jeff Garzik 已提交
2587 2588 2589
 *	This function issues commands to standard SATA Sxxx
 *	PHY registers, to wake up the phy (and device), and
 *	clear any reset condition.
L
Linus Torvalds 已提交
2590 2591
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2592
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2593 2594 2595 2596
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
2597
	struct ata_link *link = &ap->link;
L
Linus Torvalds 已提交
2598
	unsigned long timeout = jiffies + (HZ * 5);
2599
	u32 sstatus;
L
Linus Torvalds 已提交
2600 2601

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2602
		/* issue phy wake/reset */
2603
		sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2604 2605 2606
		/* Couldn't find anything in SATA I/II specs, but
		 * AHCI-1.1 10.4.2 says at least 1 ms. */
		mdelay(1);
L
Linus Torvalds 已提交
2607
	}
2608
	/* phy wake/clear reset */
2609
	sata_scr_write_flush(link, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2610 2611 2612 2613

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2614
		sata_scr_read(link, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2615 2616 2617 2618
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2619
	/* print link status */
2620
	sata_print_link_status(link);
2621

2622
	/* TODO: phy layer with polling, timeouts, etc. */
2623
	if (!ata_link_offline(link))
L
Linus Torvalds 已提交
2624
		ata_port_probe(ap);
2625
	else
L
Linus Torvalds 已提交
2626 2627
		ata_port_disable(ap);

2628
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
		return;

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
		ata_port_disable(ap);
		return;
	}

	ap->cbl = ATA_CBL_SATA;
}

/**
J
Jeff Garzik 已提交
2640 2641
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2642
 *
J
Jeff Garzik 已提交
2643 2644
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2645 2646
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2647
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2648 2649 2650 2651 2652
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2653
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2654 2655 2656 2657
		return;
	ata_bus_reset(ap);
}

2658 2659 2660 2661 2662 2663 2664
/**
 *	ata_dev_pair		-	return other device on cable
 *	@adev: device
 *
 *	Obtain the other device on the same cable, or if none is
 *	present NULL is returned
 */
2665

T
Tejun Heo 已提交
2666
struct ata_device *ata_dev_pair(struct ata_device *adev)
2667
{
T
Tejun Heo 已提交
2668 2669
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2670
	if (!ata_dev_enabled(pair))
2671 2672 2673 2674
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2675
/**
J
Jeff Garzik 已提交
2676 2677
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2678
 *
J
Jeff Garzik 已提交
2679 2680 2681 2682 2683
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is disabled, and should
 *	never attempt to probe or communicate with devices
 *	on this port.
 *
J
Jeff Garzik 已提交
2684
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2685
 *	serialization.
L
Linus Torvalds 已提交
2686 2687 2688 2689
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2690 2691
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2692
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2693 2694
}

2695
/**
2696
 *	sata_down_spd_limit - adjust SATA spd limit downward
2697
 *	@link: Link to adjust SATA spd limit for
2698
 *
2699
 *	Adjust SATA spd limit of @link downward.  Note that this
2700
 *	function only adjusts the limit.  The change must be applied
2701
 *	using sata_set_spd().
2702 2703 2704 2705 2706 2707 2708
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2709
int sata_down_spd_limit(struct ata_link *link)
2710
{
2711 2712
	u32 sstatus, spd, mask;
	int rc, highbit;
2713

2714
	if (!sata_scr_valid(link))
2715 2716 2717
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2718
	 * If not, use cached value in link->sata_spd.
2719
	 */
2720
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2721 2722 2723
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2724
		spd = link->sata_spd;
2725

2726
	mask = link->sata_spd_limit;
2727 2728
	if (mask <= 1)
		return -EINVAL;
2729 2730

	/* unconditionally mask off the highest bit */
2731 2732 2733
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2734 2735 2736 2737 2738 2739 2740 2741 2742
	/* Mask off all speeds higher than or equal to the current
	 * one.  Force 1.5Gbps if current SPD is not available.
	 */
	if (spd > 1)
		mask &= (1 << (spd - 1)) - 1;
	else
		mask &= 1;

	/* were we already at the bottom? */
2743 2744 2745
	if (!mask)
		return -EINVAL;

2746
	link->sata_spd_limit = mask;
2747

2748
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2749
			sata_spd_string(fls(mask)));
2750 2751 2752 2753

	return 0;
}

2754
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2755
{
2756 2757
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2758

2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769
	limit = link->sata_spd_limit;

	/* Don't configure downstream link faster than upstream link.
	 * It doesn't speed up anything and some PMPs choke on such
	 * configuration.
	 */
	if (!ata_is_host_link(link) && host_link->sata_spd)
		limit &= (1 << host_link->sata_spd) - 1;

	if (limit == UINT_MAX)
		target = 0;
2770
	else
2771
		target = fls(limit);
2772 2773

	spd = (*scontrol >> 4) & 0xf;
2774
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2775

2776
	return spd != target;
2777 2778 2779
}

/**
2780
 *	sata_set_spd_needed - is SATA spd configuration needed
2781
 *	@link: Link in question
2782 2783
 *
 *	Test whether the spd limit in SControl matches
2784
 *	@link->sata_spd_limit.  This function is used to determine
2785 2786 2787 2788 2789 2790 2791 2792 2793
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2794
int sata_set_spd_needed(struct ata_link *link)
2795 2796 2797
{
	u32 scontrol;

2798
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2799
		return 1;
2800

2801
	return __sata_set_spd_needed(link, &scontrol);
2802 2803 2804
}

/**
2805
 *	sata_set_spd - set SATA spd according to spd limit
2806
 *	@link: Link to set SATA spd for
2807
 *
2808
 *	Set SATA spd of @link according to sata_spd_limit.
2809 2810 2811 2812 2813 2814
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2815
 *	changed.  Negative errno if SCR registers are inaccessible.
2816
 */
2817
int sata_set_spd(struct ata_link *link)
2818 2819
{
	u32 scontrol;
2820
	int rc;
2821

2822
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2823
		return rc;
2824

2825
	if (!__sata_set_spd_needed(link, &scontrol))
2826 2827
		return 0;

2828
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2829 2830
		return rc;

2831 2832 2833
	return 1;
}

A
Alan Cox 已提交
2834 2835 2836 2837 2838
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2839
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2840
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2841 2842 2843
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
A
Alan Cox 已提交
2844 2845 2846 2847 2848 2849 2850 2851 2852
 */

static const struct ata_timing ata_timing[] = {

	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },

2853 2854
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
A
Alan Cox 已提交
2855 2856 2857 2858 2859
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
2860

A
Alan Cox 已提交
2861 2862 2863
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
2864

A
Alan Cox 已提交
2865 2866 2867 2868
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },

2869 2870
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
A
Alan Cox 已提交
2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },

	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },

/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */

	{ 0xFF }
};

2883 2884
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
	q->setup   = EZ(t->setup   * 1000,  T);
	q->act8b   = EZ(t->act8b   * 1000,  T);
	q->rec8b   = EZ(t->rec8b   * 1000,  T);
	q->cyc8b   = EZ(t->cyc8b   * 1000,  T);
	q->active  = EZ(t->active  * 1000,  T);
	q->recover = EZ(t->recover * 1000,  T);
	q->cycle   = EZ(t->cycle   * 1000,  T);
	q->udma    = EZ(t->udma    * 1000, UT);
}

void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
		      struct ata_timing *m, unsigned int what)
{
	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2911
static const struct ata_timing *ata_timing_find_mode(unsigned short speed)
A
Alan Cox 已提交
2912 2913 2914 2915
{
	const struct ata_timing *t;

	for (t = ata_timing; t->mode != speed; t++)
A
Alan Cox 已提交
2916
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2917
			return NULL;
2918
	return t;
A
Alan Cox 已提交
2919 2920 2921 2922 2923 2924 2925 2926 2927
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
	const struct ata_timing *s;
	struct ata_timing p;

	/*
2928
	 * Find the mode.
2929
	 */
A
Alan Cox 已提交
2930 2931 2932 2933

	if (!(s = ata_timing_find_mode(speed)))
		return -EINVAL;

2934 2935
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2936 2937 2938 2939 2940 2941 2942
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
		memset(&p, 0, sizeof(p));
2943
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
2944 2945
			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
2946
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
2947 2948 2949 2950 2951 2952 2953 2954 2955
			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
		}
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

	/*
	 * Convert the timing to bus clock counts.
	 */

2956
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2957 2958

	/*
2959 2960 2961
	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
	 * S.M.A.R.T * and some other commands. We have to ensure that the
	 * DMA cycle timing is slower/equal than the fastest PIO timing.
A
Alan Cox 已提交
2962 2963
	 */

2964
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2965 2966 2967 2968 2969
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2970
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
	 */

	if (t->act8b + t->rec8b < t->cyc8b) {
		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
		t->rec8b = t->cyc8b - t->act8b;
	}

	if (t->active + t->recover < t->cycle) {
		t->active += (t->cycle - (t->active + t->recover)) / 2;
		t->recover = t->cycle - t->active;
	}
J
Jeff Garzik 已提交
2982

2983 2984 2985 2986 2987
	/* In a few cases quantisation may produce enough errors to
	   leave t->cycle too low for the sum of active and recovery
	   if so we must correct this */
	if (t->active + t->recover > t->cycle)
		t->cycle = t->active + t->recover;
A
Alan Cox 已提交
2988 2989 2990 2991

	return 0;
}

2992 2993 2994
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2995
 *	@sel: ATA_DNXFER_* selector
2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
3007
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3008
{
3009 3010 3011 3012
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
3013

3014 3015
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3016

3017 3018 3019 3020
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3021

3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

	case ATA_DNXFER_DMA:
		if (udma_mask) {
			highbit = fls(udma_mask) - 1;
			udma_mask &= ~(1 << highbit);
			if (!udma_mask)
				return -ENOENT;
		} else if (mwdma_mask) {
			highbit = fls(mwdma_mask) - 1;
			mwdma_mask &= ~(1 << highbit);
			if (!mwdma_mask)
				return -ENOENT;
		}
		break;

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

	case ATA_DNXFER_FORCE_PIO0:
		pio_mask &= 1;
	case ATA_DNXFER_FORCE_PIO:
		mwdma_mask = 0;
		udma_mask = 0;
		break;

	default:
		BUG();
	}

	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);

	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
		return -ENOENT;

	if (!quiet) {
		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
			snprintf(buf, sizeof(buf), "%s:%s",
				 ata_mode_string(xfer_mask),
				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
		else
			snprintf(buf, sizeof(buf), "%s",
				 ata_mode_string(xfer_mask));

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
3074 3075 3076 3077 3078 3079 3080

	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
			    &dev->udma_mask);

	return 0;
}

T
Tejun Heo 已提交
3081
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3082
{
T
Tejun Heo 已提交
3083
	struct ata_eh_context *ehc = &dev->link->eh_context;
3084 3085
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
3086

3087
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3088 3089 3090
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
3091
	err_mask = ata_dev_set_xfermode(dev);
3092

3093 3094
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3095 3096
		err_mask &= ~AC_ERR_DEV;

A
Alan Cox 已提交
3097 3098 3099 3100 3101
	/* Some very old devices and some bad newer ones fail any kind of
	   SET_XFERMODE request but support PIO0-2 timings and no IORDY */
	if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
			dev->pio_mode <= XFER_PIO_2)
		err_mask &= ~AC_ERR_DEV;
3102

3103 3104 3105 3106 3107 3108 3109
	/* Early MWDMA devices do DMA but don't allow DMA mode setting.
	   Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
	if (dev->xfer_shift == ATA_SHIFT_MWDMA && 
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
		err_mask &= ~AC_ERR_DEV;

3110
	if (err_mask) {
3111 3112
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
3113 3114
		return -EIO;
	}
L
Linus Torvalds 已提交
3115

3116
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
3117
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3118
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3119
	if (rc)
3120
		return rc;
3121

3122 3123
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3124

3125 3126
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
3127
	return 0;
L
Linus Torvalds 已提交
3128 3129 3130
}

/**
3131
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3132
 *	@link: link on which timings will be programmed
3133
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
3134
 *
3135 3136 3137
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
3138
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3139
 *
L
Linus Torvalds 已提交
3140
 *	LOCKING:
J
Jeff Garzik 已提交
3141
 *	PCI/etc. bus probe sem.
3142 3143 3144
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3145
 */
3146

3147
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3148
{
3149
	struct ata_port *ap = link->ap;
3150
	struct ata_device *dev;
3151
	int rc = 0, used_dma = 0, found = 0;
3152

3153
	/* step 1: calculate xfer_mask */
3154
	ata_link_for_each_dev(dev, link) {
3155
		unsigned int pio_mask, dma_mask;
3156
		unsigned int mode_mask;
3157

3158
		if (!ata_dev_enabled(dev))
3159 3160
			continue;

3161 3162 3163 3164 3165 3166
		mode_mask = ATA_DMA_MASK_ATA;
		if (dev->class == ATA_DEV_ATAPI)
			mode_mask = ATA_DMA_MASK_ATAPI;
		else if (ata_id_is_cfa(dev->id))
			mode_mask = ATA_DMA_MASK_CFA;

T
Tejun Heo 已提交
3167
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
3168

3169 3170
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3171 3172 3173 3174 3175 3176

		if (libata_dma_mask & mode_mask)
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
		else
			dma_mask = 0;

3177 3178
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3179

3180
		found = 1;
3181 3182
		if (dev->dma_mode)
			used_dma = 1;
3183
	}
3184
	if (!found)
3185
		goto out;
3186 3187

	/* step 2: always set host PIO timings */
3188
	ata_link_for_each_dev(dev, link) {
3189 3190 3191 3192
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
3193
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3194
			rc = -EINVAL;
3195
			goto out;
3196 3197 3198 3199 3200 3201 3202
		}

		dev->xfer_mode = dev->pio_mode;
		dev->xfer_shift = ATA_SHIFT_PIO;
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}
L
Linus Torvalds 已提交
3203

3204
	/* step 3: set host DMA timings */
3205
	ata_link_for_each_dev(dev, link) {
3206 3207 3208 3209 3210 3211 3212 3213
		if (!ata_dev_enabled(dev) || !dev->dma_mode)
			continue;

		dev->xfer_mode = dev->dma_mode;
		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
		if (ap->ops->set_dmamode)
			ap->ops->set_dmamode(ap, dev);
	}
L
Linus Torvalds 已提交
3214 3215

	/* step 4: update devices' xfer mode */
3216
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
3217
		/* don't update suspended devices' xfer mode */
3218
		if (!ata_dev_enabled(dev))
3219 3220
			continue;

T
Tejun Heo 已提交
3221
		rc = ata_dev_set_mode(dev);
3222
		if (rc)
3223
			goto out;
3224
	}
L
Linus Torvalds 已提交
3225

3226 3227
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3228
	 */
J
Jeff Garzik 已提交
3229
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3230
		ap->host->simplex_claimed = ap;
3231

3232 3233 3234 3235
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3236 3237
}

3238 3239
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
3240
 *	@link: link on which timings will be programmed
3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252
 *	@r_failed_dev: out paramter for failed device
 *
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
3253
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3254
{
3255 3256
	struct ata_port *ap = link->ap;

3257 3258
	/* has private set_mode? */
	if (ap->ops->set_mode)
3259 3260
		return ap->ops->set_mode(link, r_failed_dev);
	return ata_do_set_mode(link, r_failed_dev);
3261 3262
}

3263 3264 3265 3266 3267 3268 3269 3270 3271 3272
/**
 *	ata_tf_to_host - issue ATA taskfile to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues ATA taskfile register set to ATA host controller,
 *	with proper synchronization with interrupt handler and
 *	other threads.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3273
 *	spin_lock_irqsave(host lock)
3274 3275 3276 3277 3278 3279 3280 3281 3282
 */

static inline void ata_tf_to_host(struct ata_port *ap,
				  const struct ata_taskfile *tf)
{
	ap->ops->tf_load(ap, tf);
	ap->ops->exec_command(ap, tf);
}

L
Linus Torvalds 已提交
3283 3284 3285 3286 3287 3288
/**
 *	ata_busy_sleep - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@tmout_pat: impatience timeout
 *	@tmout: overall timeout
 *
J
Jeff Garzik 已提交
3289 3290 3291
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
3292 3293 3294 3295 3296
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
3297
 */
3298 3299
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
3300 3301 3302 3303 3304 3305 3306
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
3307 3308
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3309 3310 3311 3312
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

3313
	if (status != 0xff && (status & ATA_BUSY))
3314
		ata_port_printk(ap, KERN_WARNING,
3315 3316
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
3317 3318

	timeout = timer_start + tmout;
3319 3320
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3321 3322 3323 3324
		msleep(50);
		status = ata_chk_status(ap);
	}

3325 3326 3327
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
3328
	if (status & ATA_BUSY) {
3329
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
3330 3331
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
3332
		return -EBUSY;
L
Linus Torvalds 已提交
3333 3334 3335 3336 3337
	}

	return 0;
}

3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
/**
 *	ata_wait_after_reset - wait before checking status after reset
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	After reset, we need to pause a while before reading status.
 *	Also, certain combination of controller and device report 0xff
 *	for some duration (e.g. until SATA PHY is up and running)
 *	which is interpreted as empty port in ATA world.  This
 *	function also waits for such devices to get out of 0xff
 *	status.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_wait_after_reset(struct ata_port *ap, unsigned long deadline)
{
	unsigned long until = jiffies + ATA_TMOUT_FF_WAIT;

	if (time_before(until, deadline))
		deadline = until;

	/* Spec mandates ">= 2ms" before checking status.  We wait
	 * 150ms, because that was the magic delay used for ATAPI
	 * devices in Hale Landis's ATADRVR, for the period of time
	 * between when the ATA command register is written, and then
	 * status is checked.  Because waiting for "a while" before
	 * checking status is fine, post SRST, we perform this magic
	 * delay here as well.
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready.
	 */
	msleep(150);

	/* Wait for 0xff to clear.  Some SATA devices take a long time
	 * to clear 0xff after reset.  For example, HHD424020F7SV00
	 * iVDR needs >= 800ms while.  Quantum GoVault needs even more
	 * than that.
3376 3377 3378 3379
	 *
	 * Note that some PATA controllers (pata_ali) explode if
	 * status register is read more than once when there's no
	 * device attached.
3380
	 */
3381 3382 3383
	if (ap->flags & ATA_FLAG_SATA) {
		while (1) {
			u8 status = ata_chk_status(ap);
3384

3385 3386
			if (status != 0xff || time_after(jiffies, deadline))
				return;
3387

3388 3389
			msleep(50);
		}
3390 3391 3392
	}
}

3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417
/**
 *	ata_wait_ready - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	Sleep until ATA Status register bit BSY clears, or timeout
 *	occurs.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
{
	unsigned long start = jiffies;
	int warned = 0;

	while (1) {
		u8 status = ata_chk_status(ap);
		unsigned long now = jiffies;

		if (!(status & ATA_BUSY))
			return 0;
3418
		if (!ata_link_online(&ap->link) && status == 0xff)
3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436
			return -ENODEV;
		if (time_after(now, deadline))
			return -EBUSY;

		if (!warned && time_after(now, start + 5 * HZ) &&
		    (deadline - now > 3 * HZ)) {
			ata_port_printk(ap, KERN_WARNING,
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
			warned = 1;
		}

		msleep(50);
	}
}

static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
			      unsigned long deadline)
L
Linus Torvalds 已提交
3437 3438 3439 3440
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3441
	int rc, ret = 0;
L
Linus Torvalds 已提交
3442 3443 3444 3445

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3446 3447
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3448 3449 3450 3451 3452
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3453
	}
L
Linus Torvalds 已提交
3454

3455 3456
	/* if device 1 was found in ata_devchk, wait for register
	 * access briefly, then wait for BSY to clear.
L
Linus Torvalds 已提交
3457
	 */
3458 3459
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3460 3461

		ap->ops->dev_select(ap, 1);
3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476

		/* Wait for register access.  Some ATAPI devices fail
		 * to set nsect/lbal after reset, so don't waste too
		 * much time on it.  We're gonna wait for !BSY anyway.
		 */
		for (i = 0; i < 2; i++) {
			u8 nsect, lbal;

			nsect = ioread8(ioaddr->nsect_addr);
			lbal = ioread8(ioaddr->lbal_addr);
			if ((nsect == 1) && (lbal == 1))
				break;
			msleep(50);	/* give drive a breather */
		}

3477
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3478 3479 3480 3481 3482
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3483
	}
L
Linus Torvalds 已提交
3484 3485 3486 3487 3488 3489 3490

	/* is all this really necessary? */
	ap->ops->dev_select(ap, 0);
	if (dev1)
		ap->ops->dev_select(ap, 1);
	if (dev0)
		ap->ops->dev_select(ap, 0);
3491

T
Tejun Heo 已提交
3492
	return ret;
L
Linus Torvalds 已提交
3493 3494
}

3495 3496
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3497 3498 3499
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3500
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3501 3502

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3503 3504 3505 3506 3507
	iowrite8(ap->ctl, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3508

3509 3510
	/* wait a while before checking status */
	ata_wait_after_reset(ap, deadline);
L
Linus Torvalds 已提交
3511

3512
	/* Before we perform post reset processing we want to see if
3513 3514 3515
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3516
	if (ata_chk_status(ap) == 0xFF)
T
Tejun Heo 已提交
3517
		return -ENODEV;
3518

3519
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534
}

/**
 *	ata_bus_reset - reset host port and associated ATA channel
 *	@ap: port to reset
 *
 *	This is typically the first time we actually start issuing
 *	commands to the ATA channel.  We wait for BSY to clear, then
 *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
 *	result.  Determine what devices, if any, are on the channel
 *	by looking at the device 0/1 error register.  Look at the signature
 *	stored in each device's taskfile registers, to determine if
 *	the device is ATA or ATAPI.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3535
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3536
 *	Obtains host lock.
L
Linus Torvalds 已提交
3537 3538
 *
 *	SIDE EFFECTS:
3539
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3540 3541 3542 3543
 */

void ata_bus_reset(struct ata_port *ap)
{
T
Tejun Heo 已提交
3544
	struct ata_device *device = ap->link.device;
L
Linus Torvalds 已提交
3545 3546 3547
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3548
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3549
	int rc;
L
Linus Torvalds 已提交
3550

T
Tejun Heo 已提交
3551
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570

	/* determine if device 0/1 are present */
	if (ap->flags & ATA_FLAG_SATA_RESET)
		dev0 = 1;
	else {
		dev0 = ata_devchk(ap, 0);
		if (slave_possible)
			dev1 = ata_devchk(ap, 1);
	}

	if (dev0)
		devmask |= (1 << 0);
	if (dev1)
		devmask |= (1 << 1);

	/* select device 0 again */
	ap->ops->dev_select(ap, 0);

	/* issue bus reset */
T
Tejun Heo 已提交
3571 3572 3573
	if (ap->flags & ATA_FLAG_SRST) {
		rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
		if (rc && rc != -ENODEV)
T
Tejun Heo 已提交
3574
			goto err_out;
T
Tejun Heo 已提交
3575
	}
L
Linus Torvalds 已提交
3576 3577 3578 3579

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3580
	device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
L
Linus Torvalds 已提交
3581
	if ((slave_possible) && (err != 0x81))
3582
		device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
L
Linus Torvalds 已提交
3583 3584

	/* is double-select really necessary? */
T
Tejun Heo 已提交
3585
	if (device[1].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3586
		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3587
	if (device[0].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3588 3589 3590
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
T
Tejun Heo 已提交
3591 3592
	if ((device[0].class == ATA_DEV_NONE) &&
	    (device[1].class == ATA_DEV_NONE))
L
Linus Torvalds 已提交
3593 3594 3595 3596
		goto err_out;

	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
		/* set up device control for ATA_FLAG_SATA_RESET */
T
Tejun Heo 已提交
3597
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3598 3599 3600 3601 3602 3603
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3604
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
3605
	ata_port_disable(ap);
L
Linus Torvalds 已提交
3606 3607 3608 3609

	DPRINTK("EXIT\n");
}

3610
/**
3611 3612
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3613
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3614
 *	@deadline: deadline jiffies for the operation
3615
 *
3616
*	Make sure SStatus of @link reaches stable state, determined by
3617 3618
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3619 3620
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3621 3622
 *	until timeout then returns 0 if DET is stable at 1.
 *
3623 3624 3625
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3626 3627 3628 3629 3630 3631
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3632 3633
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3634
{
3635
	unsigned long interval_msec = params[0];
3636 3637
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3638 3639 3640
	u32 last, cur;
	int rc;

3641 3642 3643 3644
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3645
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3646 3647 3648 3649 3650 3651 3652 3653
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3654
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3655 3656 3657 3658 3659
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3660
			if (cur == 1 && time_before(jiffies, deadline))
3661 3662 3663 3664 3665 3666 3667 3668 3669 3670
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

		/* unstable, start over */
		last = cur;
		last_jiffies = jiffies;

3671 3672 3673
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3674
		if (time_after(jiffies, deadline))
3675
			return -EPIPE;
3676 3677 3678 3679
	}
}

/**
3680 3681
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3682
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3683
 *	@deadline: deadline jiffies for the operation
3684
 *
3685
 *	Resume SATA phy @link and debounce it.
3686 3687 3688 3689 3690 3691 3692
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3693 3694
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3695 3696
{
	u32 scontrol;
3697 3698
	int rc;

3699
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3700
		return rc;
3701

3702
	scontrol = (scontrol & 0x0f0) | 0x300;
3703

3704
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3705
		return rc;
3706

3707 3708 3709 3710
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3711

3712
	return sata_link_debounce(link, params, deadline);
3713 3714
}

3715 3716
/**
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3717
 *	@link: ATA link to be reset
3718
 *	@deadline: deadline jiffies for the operation
3719
 *
T
Tejun Heo 已提交
3720
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3721 3722 3723 3724
 *	prereset makes libata abort whole reset sequence and give up
 *	that port, so prereset should be best-effort.  It does its
 *	best to prepare for reset sequence but if things go wrong, it
 *	should just whine, not fail.
3725 3726 3727 3728 3729 3730 3731
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3732
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3733
{
T
Tejun Heo 已提交
3734
	struct ata_port *ap = link->ap;
3735
	struct ata_eh_context *ehc = &link->eh_context;
3736
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3737 3738
	int rc;

T
Tejun Heo 已提交
3739
	/* handle link resume */
3740
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3741
	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3742 3743
		ehc->i.action |= ATA_EH_HARDRESET;

3744 3745 3746 3747 3748 3749
	/* Some PMPs don't work with only SRST, force hardreset if PMP
	 * is supported.
	 */
	if (ap->flags & ATA_FLAG_PMP)
		ehc->i.action |= ATA_EH_HARDRESET;

3750 3751 3752 3753
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3754
	/* if SATA, resume link */
3755
	if (ap->flags & ATA_FLAG_SATA) {
3756
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3757 3758
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3759
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3760 3761 3762 3763 3764 3765
					"link for reset (errno=%d)\n", rc);
	}

	/* Wait for !BSY if the controller can wait for the first D2H
	 * Reg FIS and we don't know that no device is attached.
	 */
3766
	if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
T
Tejun Heo 已提交
3767
		rc = ata_wait_ready(ap, deadline);
3768
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3769
			ata_link_printk(link, KERN_WARNING, "device not ready "
T
Tejun Heo 已提交
3770 3771 3772 3773
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3774 3775 3776 3777

	return 0;
}

3778 3779
/**
 *	ata_std_softreset - reset host port via ATA SRST
T
Tejun Heo 已提交
3780
 *	@link: ATA link to reset
3781
 *	@classes: resulting classes of attached devices
3782
 *	@deadline: deadline jiffies for the operation
3783
 *
3784
 *	Reset host port using ATA SRST.
3785 3786 3787 3788 3789 3790 3791
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3792
int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3793
		      unsigned long deadline)
3794
{
T
Tejun Heo 已提交
3795
	struct ata_port *ap = link->ap;
3796
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3797 3798
	unsigned int devmask = 0;
	int rc;
3799 3800 3801 3802
	u8 err;

	DPRINTK("ENTER\n");

3803
	if (ata_link_offline(link)) {
3804 3805 3806 3807
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818
	/* determine if device 0/1 are present */
	if (ata_devchk(ap, 0))
		devmask |= (1 << 0);
	if (slave_possible && ata_devchk(ap, 1))
		devmask |= (1 << 1);

	/* select device 0 again */
	ap->ops->dev_select(ap, 0);

	/* issue bus reset */
	DPRINTK("about to softreset, devmask=%x\n", devmask);
3819
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3820
	/* if link is occupied, -ENODEV too is an error */
3821
	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
T
Tejun Heo 已提交
3822
		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3823
		return rc;
3824 3825 3826
	}

	/* determine by signature whether we have ATA or ATAPI devices */
3827 3828
	classes[0] = ata_dev_try_classify(&link->device[0],
					  devmask & (1 << 0), &err);
3829
	if (slave_possible && err != 0x81)
3830 3831
		classes[1] = ata_dev_try_classify(&link->device[1],
						  devmask & (1 << 1), &err);
3832

3833
 out:
3834 3835 3836 3837 3838
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
T
Tejun Heo 已提交
3839 3840
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
3841
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3842
 *	@deadline: deadline jiffies for the operation
3843
 *
T
Tejun Heo 已提交
3844
 *	SATA phy-reset @link using DET bits of SControl register.
3845 3846 3847 3848 3849 3850 3851
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3852
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3853
			unsigned long deadline)
3854
{
3855
	u32 scontrol;
3856
	int rc;
3857

3858 3859
	DPRINTK("ENTER\n");

3860
	if (sata_set_spd_needed(link)) {
3861 3862 3863 3864 3865
		/* SATA spec says nothing about how to reconfigure
		 * spd.  To be on the safe side, turn off phy during
		 * reconfiguration.  This works for at least ICH7 AHCI
		 * and Sil3124.
		 */
3866
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3867
			goto out;
3868

3869
		scontrol = (scontrol & 0x0f0) | 0x304;
3870

3871
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3872
			goto out;
3873

3874
		sata_set_spd(link);
3875 3876 3877
	}

	/* issue phy wake/reset */
3878
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3879
		goto out;
3880

3881
	scontrol = (scontrol & 0x0f0) | 0x301;
3882

3883
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3884
		goto out;
3885

3886
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3887 3888 3889 3890
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3891 3892
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3893 3894 3895 3896 3897 3898 3899
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
T
Tejun Heo 已提交
3900
 *	@link: link to reset
3901
 *	@class: resulting class of attached device
3902
 *	@deadline: deadline jiffies for the operation
3903 3904 3905 3906 3907 3908 3909 3910 3911 3912
 *
 *	SATA phy-reset host port using DET bits of SControl register,
 *	wait for !BSY and classify the attached device.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3913
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3914
		       unsigned long deadline)
3915
{
T
Tejun Heo 已提交
3916
	struct ata_port *ap = link->ap;
3917
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3918 3919 3920 3921 3922
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
T
Tejun Heo 已提交
3923
	rc = sata_link_hardreset(link, timing, deadline);
3924
	if (rc) {
T
Tejun Heo 已提交
3925
		ata_link_printk(link, KERN_ERR,
3926 3927 3928
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3929 3930

	/* TODO: phy layer with polling, timeouts, etc. */
3931
	if (ata_link_offline(link)) {
3932 3933 3934 3935 3936
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3937 3938
	/* wait a while before checking status */
	ata_wait_after_reset(ap, deadline);
3939

3940 3941 3942 3943 3944 3945 3946 3947 3948 3949
	/* If PMP is supported, we have to do follow-up SRST.  Note
	 * that some PMPs don't send D2H Reg FIS after hardreset at
	 * all if the first port is empty.  Wait for it just for a
	 * second and request follow-up SRST.
	 */
	if (ap->flags & ATA_FLAG_PMP) {
		ata_wait_ready(ap, jiffies + HZ);
		return -EAGAIN;
	}

3950
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3951 3952
	/* link occupied, -ENODEV too is an error */
	if (rc) {
T
Tejun Heo 已提交
3953
		ata_link_printk(link, KERN_ERR,
3954 3955
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3956 3957
	}

3958 3959
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3960
	*class = ata_dev_try_classify(link->device, 1, NULL);
3961 3962 3963 3964 3965 3966 3967

	DPRINTK("EXIT, class=%u\n", *class);
	return 0;
}

/**
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3968
 *	@link: the target ata_link
3969 3970 3971 3972 3973 3974 3975 3976 3977
 *	@classes: classes of attached devices
 *
 *	This function is invoked after a successful reset.  Note that
 *	the device might have been reset more than once using
 *	different reset methods before postreset is invoked.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
T
Tejun Heo 已提交
3978
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3979
{
T
Tejun Heo 已提交
3980
	struct ata_port *ap = link->ap;
3981 3982
	u32 serror;

3983 3984 3985
	DPRINTK("ENTER\n");

	/* print link status */
3986
	sata_print_link_status(link);
3987

3988
	/* clear SError */
3989 3990
	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
		sata_scr_write(link, SCR_ERROR, serror);
3991

3992 3993 3994 3995 3996 3997
	/* is double-select really necessary? */
	if (classes[0] != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 1);
	if (classes[1] != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 0);

3998 3999 4000 4001 4002 4003 4004
	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		DPRINTK("EXIT, no device\n");
		return;
	}

	/* set up device control */
T
Tejun Heo 已提交
4005 4006
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
4007 4008 4009 4010

	DPRINTK("EXIT\n");
}

4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026
/**
 *	ata_dev_same_device - Determine whether new ID matches configured device
 *	@dev: device to compare against
 *	@new_class: class of the new device
 *	@new_id: IDENTIFY page of the new device
 *
 *	Compare @new_class and @new_id against @dev and determine
 *	whether @dev is the device indicated by @new_class and
 *	@new_id.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if @dev matches @new_class and @new_id, 0 otherwise.
 */
T
Tejun Heo 已提交
4027 4028
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
4029 4030
{
	const u16 *old_id = dev->id;
4031 4032
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4033 4034

	if (dev->class != new_class) {
4035 4036
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
4037 4038 4039
		return 0;
	}

4040 4041 4042 4043
	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
4044 4045

	if (strcmp(model[0], model[1])) {
4046 4047
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
4048 4049 4050 4051
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
4052 4053
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
4054 4055 4056 4057 4058 4059 4060
		return 0;
	}

	return 1;
}

/**
4061
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
4062
 *	@dev: target ATA device
4063
 *	@readid_flags: read ID flags
4064 4065 4066 4067 4068 4069 4070 4071 4072 4073
 *
 *	Re-read IDENTIFY page and make sure @dev is still attached to
 *	the port.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
4074
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4075
{
4076
	unsigned int class = dev->class;
T
Tejun Heo 已提交
4077
	u16 *id = (void *)dev->link->ap->sector_buf;
4078 4079
	int rc;

4080
	/* read ID data */
4081
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4082
	if (rc)
4083
		return rc;
4084 4085

	/* is the device still there? */
4086 4087
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
4088

4089
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4090 4091 4092 4093 4094 4095
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4096
 *	@new_class: new class code
4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107
 *	@readid_flags: read ID flags
 *
 *	Re-read IDENTIFY page, make sure @dev is still attached to the
 *	port and reconfigure it according to the new IDENTIFY page.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
4108 4109
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4110
{
4111
	u64 n_sectors = dev->n_sectors;
4112 4113 4114 4115 4116
	int rc;

	if (!ata_dev_enabled(dev))
		return -ENODEV;

4117 4118 4119 4120 4121 4122 4123 4124 4125
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
	    new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

4126 4127 4128 4129
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4130 4131

	/* configure device according to the new ID */
4132
	rc = ata_dev_configure(dev);
4133 4134 4135 4136
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4137 4138
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
4139 4140 4141 4142
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
4143 4144 4145 4146

		/* restore original n_sectors */
		dev->n_sectors = n_sectors;

4147 4148 4149 4150 4151
		rc = -ENODEV;
		goto fail;
	}

	return 0;
4152 4153

 fail:
4154
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4155 4156 4157
	return rc;
}

4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
4194
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4195
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4196 4197 4198
	/* Odd clown on sil3726/4726 PMPs */
	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
						ATA_HORKAGE_SKIP_PM },
4199

4200
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4201
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4202

4203 4204 4205 4206
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4207
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4208 4209
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4210
	/* NCQ is broken */
4211
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4212
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4213 4214
	{ "HITACHI HDS7250SASUN500G*", NULL,    ATA_HORKAGE_NONCQ },
	{ "HITACHI HDS7225SBSUN250G*", NULL,    ATA_HORKAGE_NONCQ },
4215
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4216

4217 4218 4219 4220 4221
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
4222 4223
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
4224
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
4225
	{ "HDT722516DLA380",	"V43OA96A",	ATA_HORKAGE_NONCQ, },
4226
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
4227
	{ "Hitachi HTS542525K9SA00", "BBFOC31P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
4228
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4229
	{ "WDC WD3200AAJS-00RYA0", "12.01B01",	ATA_HORKAGE_NONCQ, },
4230
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
4231
	{ "ST9120822AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
4232
	{ "ST9160821AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
4233
	{ "ST9160821AS",	"3.ALD",	ATA_HORKAGE_NONCQ, },
4234
	{ "ST9160821AS",	"3.CCD",	ATA_HORKAGE_NONCQ, },
4235 4236
	{ "ST3160812AS",	"3.ADJ",	ATA_HORKAGE_NONCQ, },
	{ "ST980813AS",		"3.ADB",	ATA_HORKAGE_NONCQ, },
4237
	{ "SAMSUNG HD401LJ",	"ZZ100-15",	ATA_HORKAGE_NONCQ, },
4238
	{ "Maxtor 7V300F0",	"VA111900",	ATA_HORKAGE_NONCQ, },
4239

4240 4241 4242 4243 4244
	/* devices which puke on READ_NATIVE_MAX */
	{ "HDS724040KLSA80",	"KFAOA20N",	ATA_HORKAGE_BROKEN_HPA, },
	{ "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
	{ "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
	{ "MAXTOR 6L080L4",	"A93.0500",	ATA_HORKAGE_BROKEN_HPA },
4245

4246 4247 4248 4249
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },

A
Alan Cox 已提交
4250 4251 4252 4253
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },

4254 4255
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4256
};
4257

4258
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4259 4260 4261 4262 4263 4264 4265 4266 4267 4268
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4269
	else {
4270
		len = strlen(name);
4271 4272 4273 4274 4275 4276
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4277 4278 4279 4280

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4281
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4282
{
T
Tejun Heo 已提交
4283 4284
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4285
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4286

T
Tejun Heo 已提交
4287 4288
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
4289

4290
	while (ad->model_num) {
4291
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4292 4293
			if (ad->model_rev == NULL)
				return ad->horkage;
4294
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4295
				return ad->horkage;
4296
		}
4297
		ad++;
4298
	}
L
Linus Torvalds 已提交
4299 4300 4301
	return 0;
}

4302 4303 4304 4305 4306 4307
static int ata_dma_blacklisted(const struct ata_device *dev)
{
	/* We don't support polling DMA.
	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
	 */
T
Tejun Heo 已提交
4308
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4309 4310
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4311
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4312 4313
}

A
Alan Cox 已提交
4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328
/**
 *	ata_is_40wire		-	check drive side detection
 *	@dev: device
 *
 *	Perform drive side detection decoding, allowing for device vendors
 *	who can't follow the documentation.
 */

static int ata_is_40wire(struct ata_device *dev)
{
	if (dev->horkage & ATA_HORKAGE_IVB)
		return ata_drive_40wire_relaxed(dev->id);
	return ata_drive_40wire(dev->id);
}

4329 4330 4331 4332
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4333 4334 4335 4336
 *	Compute supported xfermask of @dev and store it in
 *	dev->*_mask.  This function is responsible for applying all
 *	known limits including host controller limits, device
 *	blacklist, etc...
4337 4338 4339 4340
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4341
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4342
{
T
Tejun Heo 已提交
4343 4344
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4345
	struct ata_host *host = ap->host;
4346
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4347

4348
	/* controller modes available */
4349 4350 4351
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4352
	/* drive modes available */
4353 4354 4355
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4356

4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367
	/*
	 *	CFA Advanced TrueIDE timings are not allowed on a shared
	 *	cable
	 */
	if (ata_dev_pair(dev)) {
		/* No PIO5 or PIO6 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
		/* No MWDMA3 or MWDMA 4 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
	}

4368 4369
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4370 4371
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4372
	}
4373

4374
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4375
	    host->simplex_claimed && host->simplex_claimed != ap) {
4376 4377 4378
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4379
	}
4380

J
Jeff Garzik 已提交
4381 4382 4383
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4384
	if (ap->ops->mode_filter)
4385
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4386

4387 4388 4389 4390 4391 4392 4393 4394 4395 4396
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
4397
		if ((ap->cbl == ATA_CBL_PATA40) ||
A
Alan Cox 已提交
4398
		    (ata_is_40wire(dev) &&
4399 4400 4401
		    (ap->cbl == ATA_CBL_PATA_UNK ||
		     ap->cbl == ATA_CBL_PATA80))) {
			ata_dev_printk(dev, KERN_WARNING,
4402 4403 4404 4405
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4406 4407
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4408 4409 4410 4411 4412 4413
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4414 4415 4416
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4417
 *	LOCKING:
J
Jeff Garzik 已提交
4418
 *	PCI/etc. bus probe sem.
4419 4420 4421
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4422 4423
 */

T
Tejun Heo 已提交
4424
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4425
{
4426
	struct ata_taskfile tf;
4427
	unsigned int err_mask;
L
Linus Torvalds 已提交
4428 4429 4430 4431

	/* set up set-features taskfile */
	DPRINTK("set features - xfer mode\n");

T
Tejun Heo 已提交
4432 4433 4434
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4435
	ata_tf_init(dev, &tf);
4436 4437
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4438
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4439 4440
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
4441

4442
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4443 4444 4445 4446 4447

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4448
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4449 4450
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4451
 *	@feature: The sector count represents the feature to set
4452 4453
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4454
 *	on port @ap with sector count
4455 4456 4457 4458 4459 4460 4461
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4462 4463
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475
{
	struct ata_taskfile tf;
	unsigned int err_mask;

	/* set up set-features taskfile */
	DPRINTK("set features - SATA features\n");

	ata_tf_init(dev, &tf);
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = enable;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
4476
	tf.nsect = feature;
4477

4478
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4479

4480 4481
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4482 4483
}

4484 4485 4486
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4487 4488
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4489 4490
 *
 *	LOCKING:
4491 4492 4493 4494
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4495
 */
T
Tejun Heo 已提交
4496 4497
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4498
{
4499
	struct ata_taskfile tf;
4500
	unsigned int err_mask;
4501 4502 4503

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4504
		return AC_ERR_INVALID;
4505 4506 4507 4508

	/* set up init dev params taskfile */
	DPRINTK("init dev params \n");

T
Tejun Heo 已提交
4509
	ata_tf_init(dev, &tf);
4510 4511 4512 4513 4514
	tf.command = ATA_CMD_INIT_DEV_PARAMS;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = sectors;
	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4515

4516
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4517 4518 4519 4520 4521
	/* A clean abort indicates an original or just out of spec drive
	   and we should continue as we issue the setup based on the
	   drive reported working geometry */
	if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
		err_mask = 0;
4522

4523 4524
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4525 4526
}

L
Linus Torvalds 已提交
4527
/**
J
Jeff Garzik 已提交
4528 4529 4530 4531
 *	ata_sg_clean - Unmap DMA memory associated with command
 *	@qc: Command containing DMA memory to be released
 *
 *	Unmap all mapped DMA memory associated with this command.
L
Linus Torvalds 已提交
4532 4533
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4534
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4535
 */
4536
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4537 4538
{
	struct ata_port *ap = qc->ap;
4539
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4540
	int dir = qc->dma_dir;
4541
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4542

4543 4544
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4545 4546

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4547
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4548

J
Jeff Garzik 已提交
4549
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4550

4551 4552 4553 4554 4555 4556 4557 4558
	/* if we padded the buffer out to 32-bit bound, and data
	 * xfer direction is from-device, we must copy from the
	 * pad buffer back into the supplied buffer
	 */
	if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
		pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);

	if (qc->flags & ATA_QCFLAG_SG) {
4559
		if (qc->n_elem)
4560
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4561
		/* restore last sg */
J
Jens Axboe 已提交
4562
		sg_last(sg, qc->orig_n_elem)->length += qc->pad_len;
4563 4564
		if (pad_buf) {
			struct scatterlist *psg = &qc->pad_sgent;
J
Jens Axboe 已提交
4565
			void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4566
			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4567
			kunmap_atomic(addr, KM_IRQ0);
4568 4569
		}
	} else {
4570
		if (qc->n_elem)
4571
			dma_unmap_single(ap->dev,
4572 4573
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4574 4575 4576 4577 4578 4579
		/* restore sg */
		sg->length += qc->pad_len;
		if (pad_buf)
			memcpy(qc->buf_virt + sg->length - qc->pad_len,
			       pad_buf, qc->pad_len);
	}
L
Linus Torvalds 已提交
4580 4581

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4582
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4583 4584 4585 4586 4587 4588
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4589 4590 4591
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4592
 *	LOCKING:
J
Jeff Garzik 已提交
4593
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4594 4595 4596 4597 4598
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4599 4600
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4601

4602
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4603
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4604 4605

	idx = 0;
4606
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635
		u32 addr, offset;
		u32 sg_len, len;

		/* determine if physical DMA addr spans 64K boundary.
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);

		while (sg_len) {
			offset = addr & 0xffff;
			len = sg_len;
			if ((offset + sg_len) > 0x10000)
				len = 0x10000 - offset;

			ap->prd[idx].addr = cpu_to_le32(addr);
			ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);

			idx++;
			sg_len -= len;
			addr += len;
		}
	}

	if (idx)
		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
}
4636

4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663
/**
 *	ata_fill_sg_dumb - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command. Perform the fill
 *	so that we avoid writing any length 64K records for
 *	controllers that don't follow the spec.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 */
static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct scatterlist *sg;
	unsigned int idx;

	WARN_ON(qc->__sg == NULL);
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);

	idx = 0;
	ata_for_each_sg(sg, qc) {
		u32 addr, offset;
		u32 sg_len, len, blen;

4664
		/* determine if physical DMA addr spans 64K boundary.
4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);

		while (sg_len) {
			offset = addr & 0xffff;
			len = sg_len;
			if ((offset + sg_len) > 0x10000)
				len = 0x10000 - offset;

			blen = len & 0xffff;
			ap->prd[idx].addr = cpu_to_le32(addr);
			if (blen == 0) {
			   /* Some PATA chipsets like the CS5530 can't
			      cope with 0x0000 meaning 64K as the spec says */
				ap->prd[idx].flags_len = cpu_to_le32(0x8000);
				blen = 0x8000;
				ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
			}
			ap->prd[idx].flags_len = cpu_to_le32(blen);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);

			idx++;
			sg_len -= len;
			addr += len;
		}
	}

	if (idx)
		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
}

L
Linus Torvalds 已提交
4699 4700 4701 4702
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4703 4704 4705 4706
 *	Allow low-level driver to filter ATA PACKET commands, returning
 *	a status indicating whether or not it is OK to use DMA for the
 *	supplied PACKET command.
 *
L
Linus Torvalds 已提交
4707
 *	LOCKING:
J
Jeff Garzik 已提交
4708
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4709
 *
L
Linus Torvalds 已提交
4710 4711 4712 4713 4714 4715
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4716 4717 4718 4719 4720 4721

	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
	if (unlikely(qc->nbytes & 15))
		return 1;
4722

L
Linus Torvalds 已提交
4723
	if (ap->ops->check_atapi_dma)
4724
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4725

4726
	return 0;
L
Linus Torvalds 已提交
4727
}
4728

4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758
/**
 *	ata_std_qc_defer - Check whether a qc needs to be deferred
 *	@qc: ATA command in question
 *
 *	Non-NCQ commands cannot run with any other command, NCQ or
 *	not.  As upper layer only knows the queue depth, we are
 *	responsible for maintaining exclusion.  This function checks
 *	whether a new command @qc can be issued.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	ATA_DEFER_* if deferring is needed, 0 otherwise.
 */
int ata_std_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_link *link = qc->dev->link;

	if (qc->tf.protocol == ATA_PROT_NCQ) {
		if (!ata_tag_valid(link->active_tag))
			return 0;
	} else {
		if (!ata_tag_valid(link->active_tag) && !link->sactive)
			return 0;
	}

	return ATA_DEFER_LINK;
}

L
Linus Torvalds 已提交
4759 4760 4761 4762
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4763 4764
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4765
 *	LOCKING:
J
Jeff Garzik 已提交
4766
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4767 4768 4769 4770 4771 4772 4773 4774 4775
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792
/**
 *	ata_dumb_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
 *	Prepare ATA taskfile for submission.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg_dumb(qc);
}

4793 4794
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4795 4796 4797 4798 4799 4800 4801 4802 4803 4804
/**
 *	ata_sg_init_one - Associate command with memory buffer
 *	@qc: Command to be associated
 *	@buf: Memory buffer
 *	@buflen: Length of memory buffer, in bytes.
 *
 *	Initialize the data-related elements of queued_cmd @qc
 *	to point to a single memory buffer, @buf of byte length @buflen.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4805
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4806 4807
 */

L
Linus Torvalds 已提交
4808 4809 4810 4811
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4812
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4813
	qc->n_elem = 1;
4814
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4815
	qc->buf_virt = buf;
4816
	qc->nbytes = buflen;
J
Jens Axboe 已提交
4817
	qc->cursg = qc->__sg;
L
Linus Torvalds 已提交
4818

4819
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4820 4821
}

J
Jeff Garzik 已提交
4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832
/**
 *	ata_sg_init - Associate command with scatter-gather table.
 *	@qc: Command to be associated
 *	@sg: Scatter-gather table.
 *	@n_elem: Number of elements in s/g table.
 *
 *	Initialize the data-related elements of queued_cmd @qc
 *	to point to a scatter-gather table @sg, containing @n_elem
 *	elements.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4833
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4834 4835
 */

L
Linus Torvalds 已提交
4836 4837 4838 4839
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4840
	qc->__sg = sg;
L
Linus Torvalds 已提交
4841
	qc->n_elem = n_elem;
4842
	qc->orig_n_elem = n_elem;
J
Jens Axboe 已提交
4843
	qc->cursg = qc->__sg;
L
Linus Torvalds 已提交
4844 4845 4846
}

/**
J
Jeff Garzik 已提交
4847 4848 4849 4850
 *	ata_sg_setup_one - DMA-map the memory buffer associated with a command.
 *	@qc: Command with memory buffer to be mapped.
 *
 *	DMA-map the memory buffer associated with queued_cmd @qc.
L
Linus Torvalds 已提交
4851 4852
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4853
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4854 4855
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4856
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4857 4858 4859 4860 4861 4862
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4863
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4864
	dma_addr_t dma_address;
4865
	int trim_sg = 0;
L
Linus Torvalds 已提交
4866

4867 4868 4869 4870 4871 4872
	/* we must lengthen transfers to end on a 32-bit boundary */
	qc->pad_len = sg->length & 3;
	if (qc->pad_len) {
		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;

4873
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		if (qc->tf.flags & ATA_TFLAG_WRITE)
			memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
			       qc->pad_len);

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim sg */
		sg->length -= qc->pad_len;
4885 4886
		if (sg->length == 0)
			trim_sg = 1;
4887 4888 4889 4890 4891

		DPRINTK("padding done, sg->length=%u pad_len=%u\n",
			sg->length, qc->pad_len);
	}

4892 4893
	if (trim_sg) {
		qc->n_elem--;
4894 4895 4896
		goto skip_map;
	}

4897
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4898
				     sg->length, dir);
4899 4900 4901
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4902
		return -1;
4903
	}
L
Linus Torvalds 已提交
4904 4905

	sg_dma_address(sg) = dma_address;
4906
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4907

4908
skip_map:
L
Linus Torvalds 已提交
4909 4910 4911 4912 4913 4914 4915
	DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
		qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

	return 0;
}

/**
J
Jeff Garzik 已提交
4916 4917 4918 4919
 *	ata_sg_setup - DMA-map the scatter-gather table associated with a command.
 *	@qc: Command with scatter-gather table to be mapped.
 *
 *	DMA-map the scatter-gather table associated with queued_cmd @qc.
L
Linus Torvalds 已提交
4920 4921
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4922
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4923 4924
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4925
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4926 4927 4928 4929 4930 4931
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4932
	struct scatterlist *sg = qc->__sg;
J
Jens Axboe 已提交
4933
	struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
4934
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4935

T
Tejun Heo 已提交
4936
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4937
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4938

4939 4940 4941 4942 4943 4944 4945
	/* we must lengthen transfers to end on a 32-bit boundary */
	qc->pad_len = lsg->length & 3;
	if (qc->pad_len) {
		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;
		unsigned int offset;

4946
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4947 4948 4949 4950 4951 4952 4953 4954

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		/*
		 * psg->page/offset are used to copy to-be-written
		 * data in this function or read data in ata_sg_clean.
		 */
		offset = lsg->offset + lsg->length - qc->pad_len;
4955
		sg_init_table(psg, 1);
4956 4957
		sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT),
				qc->pad_len, offset_in_page(offset));
4958 4959

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
J
Jens Axboe 已提交
4960
			void *addr = kmap_atomic(sg_page(psg), KM_IRQ0);
4961
			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4962
			kunmap_atomic(addr, KM_IRQ0);
4963 4964 4965 4966 4967 4968
		}

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim last sg */
		lsg->length -= qc->pad_len;
4969 4970
		if (lsg->length == 0)
			trim_sg = 1;
4971 4972 4973 4974 4975

		DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
			qc->n_elem - 1, lsg->length, qc->pad_len);
	}

4976 4977 4978 4979 4980 4981 4982 4983 4984
	pre_n_elem = qc->n_elem;
	if (trim_sg && pre_n_elem)
		pre_n_elem--;

	if (!pre_n_elem) {
		n_elem = 0;
		goto skip_map;
	}

L
Linus Torvalds 已提交
4985
	dir = qc->dma_dir;
4986
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4987 4988 4989
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4990
		return -1;
4991
	}
L
Linus Torvalds 已提交
4992 4993 4994

	DPRINTK("%d sg elements mapped\n", n_elem);

4995
skip_map:
L
Linus Torvalds 已提交
4996 4997 4998 4999 5000
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
5001
/**
5002
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
5003 5004 5005 5006 5007 5008 5009 5010
 *	@buf:  Buffer to swap
 *	@buf_words:  Number of 16-bit words in buffer.
 *
 *	Swap halves of 16-bit words if needed to convert from
 *	little-endian byte order to native cpu byte order, or
 *	vice-versa.
 *
 *	LOCKING:
R
Randy Dunlap 已提交
5011
 *	Inherited from caller.
E
Edward Falk 已提交
5012
 */
L
Linus Torvalds 已提交
5013 5014 5015 5016 5017 5018 5019 5020 5021 5022
void swap_buf_le16(u16 *buf, unsigned int buf_words)
{
#ifdef __BIG_ENDIAN
	unsigned int i;

	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
}

A
Albert Lee 已提交
5023
/**
T
Tejun Heo 已提交
5024
 *	ata_data_xfer - Transfer data by PIO
5025
 *	@adev: device to target
A
Albert Lee 已提交
5026 5027
 *	@buf: data buffer
 *	@buflen: buffer length
5028
 *	@write_data: read/write
A
Albert Lee 已提交
5029 5030 5031 5032 5033 5034
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
5035 5036
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
5037
{
T
Tejun Heo 已提交
5038
	struct ata_port *ap = adev->link->ap;
A
Albert Lee 已提交
5039
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
5040

A
Albert Lee 已提交
5041
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
5042
	if (write_data)
T
Tejun Heo 已提交
5043
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
5044
	else
T
Tejun Heo 已提交
5045
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
5046 5047 5048 5049 5050 5051 5052 5053

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
		u16 align_buf[1] = { 0 };
		unsigned char *trailing_buf = buf + buflen - 1;

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
T
Tejun Heo 已提交
5054
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
5055
		} else {
T
Tejun Heo 已提交
5056
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
5057 5058 5059
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
5060 5061
}

5062
/**
T
Tejun Heo 已提交
5063
 *	ata_data_xfer_noirq - Transfer data by PIO
5064 5065 5066 5067 5068
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
5069
 *	Transfer data from/to the device data register by PIO. Do the
5070 5071 5072 5073 5074
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
5075 5076
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
5077 5078 5079
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
5080
	ata_data_xfer(adev, buf, buflen, write_data);
5081 5082 5083 5084
	local_irq_restore(flags);
}


A
Albert Lee 已提交
5085
/**
5086
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
5087 5088
 *	@qc: Command on going
 *
5089
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
5090 5091 5092 5093 5094
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
5095 5096 5097 5098 5099 5100 5101 5102
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

5103
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
5104
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5105

J
Jens Axboe 已提交
5106
	page = sg_page(qc->cursg);
J
Jens Axboe 已提交
5107
	offset = qc->cursg->offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
5108 5109 5110 5111 5112 5113 5114

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

5115 5116 5117
	if (PageHighMem(page)) {
		unsigned long flags;

5118
		/* FIXME: use a bounce buffer */
5119 5120
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
5121

5122
		/* do the actual data transfer */
5123
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
5124

5125 5126 5127 5128
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
5129
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
5130
	}
L
Linus Torvalds 已提交
5131

5132 5133
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
5134

J
Jens Axboe 已提交
5135 5136
	if (qc->cursg_ofs == qc->cursg->length) {
		qc->cursg = sg_next(qc->cursg);
L
Linus Torvalds 已提交
5137 5138 5139 5140
		qc->cursg_ofs = 0;
	}
}

5141
/**
5142
 *	ata_pio_sectors - Transfer one or many sectors.
5143 5144
 *	@qc: Command on going
 *
5145
 *	Transfer one or many sectors of data from/to the
5146 5147 5148 5149 5150
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
5151

5152 5153 5154 5155 5156 5157
static void ata_pio_sectors(struct ata_queued_cmd *qc)
{
	if (is_multi_taskfile(&qc->tf)) {
		/* READ/WRITE MULTIPLE */
		unsigned int nsect;

J
Jeff Garzik 已提交
5158
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
5159

5160
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
5161
			    qc->dev->multi_count);
5162 5163 5164 5165
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
5166 5167

	ata_altstatus(qc->ap); /* flush */
5168 5169
}

5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185
/**
 *	atapi_send_cdb - Write CDB bytes to hardware
 *	@ap: Port to which ATAPI device is attached.
 *	@qc: Taskfile currently active
 *
 *	When device has indicated its readiness to accept
 *	a CDB, this function is called.  Send the CDB.
 *
 *	LOCKING:
 *	caller.
 */

static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
{
	/* send SCSI cdb */
	DPRINTK("send cdb\n");
5186
	WARN_ON(qc->dev->cdb_len < 12);
5187

5188
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203
	ata_altstatus(ap); /* flush */

	switch (qc->tf.protocol) {
	case ATA_PROT_ATAPI:
		ap->hsm_task_state = HSM_ST;
		break;
	case ATA_PROT_ATAPI_NODATA:
		ap->hsm_task_state = HSM_ST_LAST;
		break;
	case ATA_PROT_ATAPI_DMA:
		ap->hsm_task_state = HSM_ST_LAST;
		/* initiate bmdma */
		ap->ops->bmdma_start(qc);
		break;
	}
L
Linus Torvalds 已提交
5204 5205
}

A
Albert Lee 已提交
5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217
/**
 *	__atapi_pio_bytes - Transfer data from/to the ATAPI device.
 *	@qc: Command on going
 *	@bytes: number of bytes
 *
 *	Transfer Transfer data from/to the ATAPI device.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 */

L
Linus Torvalds 已提交
5218 5219 5220
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
5221
	struct scatterlist *sg = qc->__sg;
F
FUJITA Tomonori 已提交
5222
	struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
L
Linus Torvalds 已提交
5223 5224 5225 5226
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;
F
FUJITA Tomonori 已提交
5227
	int no_more_sg = 0;
L
Linus Torvalds 已提交
5228

5229
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
5230
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5231 5232

next_sg:
F
FUJITA Tomonori 已提交
5233
	if (unlikely(no_more_sg)) {
J
Jeff Garzik 已提交
5234
		/*
5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245
		 * The end of qc->sg is reached and the device expects
		 * more data to transfer. In order not to overrun qc->sg
		 * and fulfill length specified in the byte count register,
		 *    - for read case, discard trailing data from the device
		 *    - for write case, padding zero data to the device
		 */
		u16 pad_buf[1] = { 0 };
		unsigned int words = bytes >> 1;
		unsigned int i;

		if (words) /* warning if bytes > 1 */
5246 5247
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
5248 5249

		for (i = 0; i < words; i++)
5250
			ap->ops->data_xfer(qc->dev, (unsigned char *)pad_buf, 2, do_write);
5251

A
Albert Lee 已提交
5252
		ap->hsm_task_state = HSM_ST_LAST;
5253 5254 5255
		return;
	}

J
Jens Axboe 已提交
5256
	sg = qc->cursg;
L
Linus Torvalds 已提交
5257

J
Jens Axboe 已提交
5258
	page = sg_page(sg);
L
Linus Torvalds 已提交
5259 5260 5261 5262 5263 5264
	offset = sg->offset + qc->cursg_ofs;

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

5265
	/* don't overrun current sg */
5266
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
5267 5268 5269 5270

	/* don't cross page boundaries */
	count = min(count, (unsigned int)PAGE_SIZE - offset);

5271 5272
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

5273 5274 5275
	if (PageHighMem(page)) {
		unsigned long flags;

5276
		/* FIXME: use bounce buffer */
5277 5278
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
5279

5280
		/* do the actual data transfer */
5281
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5282

5283 5284 5285 5286
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
5287
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5288
	}
L
Linus Torvalds 已提交
5289 5290 5291 5292 5293

	bytes -= count;
	qc->curbytes += count;
	qc->cursg_ofs += count;

5294
	if (qc->cursg_ofs == sg->length) {
F
FUJITA Tomonori 已提交
5295 5296 5297
		if (qc->cursg == lsg)
			no_more_sg = 1;

J
Jens Axboe 已提交
5298
		qc->cursg = sg_next(qc->cursg);
L
Linus Torvalds 已提交
5299 5300 5301
		qc->cursg_ofs = 0;
	}

5302
	if (bytes)
L
Linus Torvalds 已提交
5303 5304 5305
		goto next_sg;
}

A
Albert Lee 已提交
5306 5307 5308 5309 5310 5311 5312 5313 5314 5315
/**
 *	atapi_pio_bytes - Transfer data from/to the ATAPI device.
 *	@qc: Command on going
 *
 *	Transfer Transfer data from/to the ATAPI device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
5316 5317 5318 5319 5320 5321 5322
static void atapi_pio_bytes(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *dev = qc->dev;
	unsigned int ireason, bc_lo, bc_hi, bytes;
	int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;

5323 5324 5325 5326 5327 5328 5329 5330 5331 5332
	/* Abuse qc->result_tf for temp storage of intermediate TF
	 * here to save some kernel stack usage.
	 * For normal completion, qc->result_tf is not relevant. For
	 * error, qc->result_tf is later overwritten by ata_qc_complete().
	 * So, the correctness of qc->result_tf is not affected.
	 */
	ap->ops->tf_read(ap, &qc->result_tf);
	ireason = qc->result_tf.nsect;
	bc_lo = qc->result_tf.lbam;
	bc_hi = qc->result_tf.lbah;
L
Linus Torvalds 已提交
5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343
	bytes = (bc_hi << 8) | bc_lo;

	/* shall be cleared to zero, indicating xfer of data */
	if (ireason & (1 << 0))
		goto err_out;

	/* make sure transfer direction matches expected */
	i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
	if (do_write != i_write)
		goto err_out;

T
Tejun Heo 已提交
5344
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5345

L
Linus Torvalds 已提交
5346
	__atapi_pio_bytes(qc, bytes);
5347
	ata_altstatus(ap); /* flush */
L
Linus Torvalds 已提交
5348 5349 5350 5351

	return;

err_out:
5352
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5353
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
5354
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
5355 5356 5357
}

/**
5358 5359 5360
 *	ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
 *	@ap: the target ata_port
 *	@qc: qc on going
L
Linus Torvalds 已提交
5361
 *
5362 5363
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
5364
 */
5365 5366

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5367
{
5368 5369
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
5370

5371 5372 5373 5374
	if (ap->hsm_task_state == HSM_ST_FIRST) {
		if (qc->tf.protocol == ATA_PROT_PIO &&
		    (qc->tf.flags & ATA_TFLAG_WRITE))
		    return 1;
L
Linus Torvalds 已提交
5375

5376 5377 5378
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
5379 5380
	}

5381 5382
	return 0;
}
L
Linus Torvalds 已提交
5383

T
Tejun Heo 已提交
5384 5385 5386 5387 5388 5389 5390 5391
/**
 *	ata_hsm_qc_complete - finish a qc running on standard HSM
 *	@qc: Command to complete
 *	@in_wq: 1 if called from workqueue, 0 otherwise
 *
 *	Finish @qc which is running on standard HSM.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5392
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
5393 5394 5395 5396 5397 5398 5399 5400 5401
 *	Otherwise, none on entry and grabs host lock.
 */
static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
{
	struct ata_port *ap = qc->ap;
	unsigned long flags;

	if (ap->ops->error_handler) {
		if (in_wq) {
5402
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
5403

J
Jeff Garzik 已提交
5404 5405
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
5406 5407 5408 5409
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5410
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5411 5412 5413 5414 5415
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

5416
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5417 5418 5419 5420 5421 5422 5423 5424
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
5425
			spin_lock_irqsave(ap->lock, flags);
5426
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5427
			ata_qc_complete(qc);
5428
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5429 5430 5431 5432 5433
		} else
			ata_qc_complete(qc);
	}
}

5434 5435 5436 5437 5438 5439 5440 5441 5442 5443
/**
 *	ata_hsm_move - move the HSM to the next state.
 *	@ap: the target ata_port
 *	@qc: qc on going
 *	@status: current device status
 *	@in_wq: 1 if called from workqueue, 0 otherwise
 *
 *	RETURNS:
 *	1 when poll next status needed, 0 otherwise.
 */
5444 5445
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
5446
{
5447 5448 5449
	unsigned long flags = 0;
	int poll_next;

5450 5451
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

5452 5453 5454 5455
	/* Make sure ata_qc_issue_prot() does not throw things
	 * like DMA polling into the workqueue. Notice that
	 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
	 */
5456
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5457

5458
fsm_start:
5459
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
5460
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5461

5462 5463
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5464 5465 5466 5467 5468 5469 5470 5471
		/* Send first data block or PACKET CDB */

		/* If polling, we will stay in the work queue after
		 * sending the data. Otherwise, interrupt handler
		 * takes over after sending the data.
		 */
		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);

5472
		/* check device status */
5473 5474 5475 5476 5477 5478 5479 5480 5481
		if (unlikely((status & ATA_DRQ) == 0)) {
			/* handle BSY=0, DRQ=0 as error */
			if (likely(status & (ATA_ERR | ATA_DF)))
				/* device stops HSM for abort/error */
				qc->err_mask |= AC_ERR_DEV;
			else
				/* HSM violation. Let EH handle this */
				qc->err_mask |= AC_ERR_HSM;

A
Albert Lee 已提交
5482
			ap->hsm_task_state = HSM_ST_ERR;
5483
			goto fsm_start;
L
Linus Torvalds 已提交
5484 5485
		}

5486 5487
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
5488 5489 5490
		 * We ignore DRQ here and stop the HSM by
		 * changing hsm_task_state to HSM_ST_ERR and
		 * let the EH abort the command or reset the device.
5491 5492
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5493 5494
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
5495
			qc->err_mask |= AC_ERR_HSM;
5496 5497
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
5498
		}
L
Linus Torvalds 已提交
5499

5500 5501 5502 5503 5504 5505
		/* Send the CDB (atapi) or the first data block (ata pio out).
		 * During the state transition, interrupt handler shouldn't
		 * be invoked before the data transfer is complete and
		 * hsm_task_state is changed. Hence, the following locking.
		 */
		if (in_wq)
5506
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
5507

5508 5509 5510 5511
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
5512

5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523
			/* ata_pio_sectors() might change the state
			 * to HSM_ST_LAST. so, the state is changed here
			 * before ata_pio_sectors().
			 */
			ap->hsm_task_state = HSM_ST;
			ata_pio_sectors(qc);
		} else
			/* send CDB */
			atapi_send_cdb(ap, qc);

		if (in_wq)
5524
			spin_unlock_irqrestore(ap->lock, flags);
5525 5526 5527 5528

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
5529
		break;
5530

5531 5532 5533 5534 5535
	case HSM_ST:
		/* complete command or read/write the data register */
		if (qc->tf.protocol == ATA_PROT_ATAPI) {
			/* ATAPI PIO protocol */
			if ((status & ATA_DRQ) == 0) {
5536 5537 5538
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
5539 5540 5541
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5542

5543 5544
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
5545 5546 5547
			 * We ignore DRQ here and stop the HSM by
			 * changing hsm_task_state to HSM_ST_ERR and
			 * let the EH abort the command or reset the device.
5548 5549
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5550 5551 5552
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
5553
				qc->err_mask |= AC_ERR_HSM;
5554 5555
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5556
			}
L
Linus Torvalds 已提交
5557

5558
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
5559

5560 5561 5562
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
5563

5564 5565 5566 5567
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
5568 5569 5570 5571
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
5572 5573 5574 5575 5576 5577
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
5578

5579 5580 5581
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5582

5583 5584 5585 5586 5587 5588 5589 5590 5591
			/* For PIO reads, some devices may ask for
			 * data transfer (DRQ=1) alone with ERR=1.
			 * We respect DRQ here and transfer one
			 * block of junk data before changing the
			 * hsm_task_state to HSM_ST_ERR.
			 *
			 * For PIO writes, ERR=1 DRQ=1 doesn't make
			 * sense since the data block has been
			 * transferred to the device.
5592 5593 5594 5595
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5596 5597 5598 5599 5600 5601

				if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
					ata_pio_sectors(qc);
					status = ata_wait_idle(ap);
				}

5602 5603 5604
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5605 5606 5607 5608 5609 5610
				/* ata_pio_sectors() might change the
				 * state to HSM_ST_LAST. so, the state
				 * is changed after ata_pio_sectors().
				 */
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5611 5612
			}

5613 5614 5615 5616 5617
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
5618
				status = ata_wait_idle(ap);
5619 5620 5621 5622
				goto fsm_start;
			}
		}

5623
		poll_next = 1;
L
Linus Torvalds 已提交
5624 5625
		break;

A
Albert Lee 已提交
5626
	case HSM_ST_LAST:
5627 5628
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5629 5630 5631 5632 5633
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5634
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5635
			ap->print_id, qc->dev->devno, status);
5636

5637 5638
		WARN_ON(qc->err_mask);

5639
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5640

5641
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5642
		ata_hsm_qc_complete(qc, in_wq);
5643 5644

		poll_next = 0;
L
Linus Torvalds 已提交
5645 5646
		break;

A
Albert Lee 已提交
5647
	case HSM_ST_ERR:
5648 5649 5650 5651 5652 5653
		/* make sure qc->err_mask is available to
		 * know what's wrong and recover
		 */
		WARN_ON(qc->err_mask == 0);

		ap->hsm_task_state = HSM_ST_IDLE;
5654

5655
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5656
		ata_hsm_qc_complete(qc, in_wq);
5657 5658

		poll_next = 0;
5659 5660
		break;
	default:
5661
		poll_next = 0;
5662
		BUG();
L
Linus Torvalds 已提交
5663 5664
	}

5665
	return poll_next;
L
Linus Torvalds 已提交
5666 5667
}

5668
static void ata_pio_task(struct work_struct *work)
5669
{
5670 5671 5672
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5673
	u8 status;
5674
	int poll_next;
5675

J
Jeff Garzik 已提交
5676
fsm_start:
5677
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5678

5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690
	/*
	 * This is purely heuristic.  This is a fast path.
	 * Sometimes when we enter, BSY will be cleared in
	 * a chk-status or two.  If not, the drive is probably seeking
	 * or something.  Snooze for a couple msecs, then
	 * chk-status again.  If still busy, queue delayed work.
	 */
	status = ata_busy_wait(ap, ATA_BUSY, 5);
	if (status & ATA_BUSY) {
		msleep(2);
		status = ata_busy_wait(ap, ATA_BUSY, 10);
		if (status & ATA_BUSY) {
5691
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5692 5693
			return;
		}
5694 5695
	}

5696 5697
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5698

5699 5700 5701 5702
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5703
		goto fsm_start;
5704 5705
}

L
Linus Torvalds 已提交
5706 5707 5708 5709 5710 5711
/**
 *	ata_qc_new - Request an available ATA command, for queueing
 *	@ap: Port associated with device @dev
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5712
 *	None.
L
Linus Torvalds 已提交
5713 5714 5715 5716 5717 5718 5719
 */

static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
{
	struct ata_queued_cmd *qc = NULL;
	unsigned int i;

5720
	/* no command while frozen */
5721
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5722 5723
		return NULL;

5724 5725
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5726
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5727
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

/**
 *	ata_qc_new_init - Request an available ATA command, and initialize it
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5742
 *	None.
L
Linus Torvalds 已提交
5743 5744
 */

T
Tejun Heo 已提交
5745
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5746
{
T
Tejun Heo 已提交
5747
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
5748 5749 5750 5751 5752 5753 5754 5755
	struct ata_queued_cmd *qc;

	qc = ata_qc_new(ap);
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
5756
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769
	}

	return qc;
}

/**
 *	ata_qc_free - free unused ata_queued_cmd
 *	@qc: Command to complete
 *
 *	Designed to free unused ata_queued_cmd object
 *	in case something prevents using it.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5770
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5771 5772 5773
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5774 5775 5776
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5777
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5778

5779 5780 5781 5782
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5783
		clear_bit(tag, &ap->qc_allocated);
5784
	}
L
Linus Torvalds 已提交
5785 5786
}

5787
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5788
{
5789
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5790
	struct ata_link *link = qc->dev->link;
5791

5792 5793
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5794 5795 5796 5797

	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
		ata_sg_clean(qc);

5798
	/* command should be marked inactive atomically with qc completion */
5799
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5800
		link->sactive &= ~(1 << qc->tag);
5801 5802 5803
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
5804
		link->active_tag = ATA_TAG_POISON;
5805 5806 5807 5808 5809 5810 5811
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
5812

5813 5814 5815 5816 5817
	/* atapi: mark qc as inactive to prevent the interrupt handler
	 * from completing the command twice later, before the error handler
	 * is called. (when rc != 0 and atapi request sense is needed)
	 */
	qc->flags &= ~ATA_QCFLAG_ACTIVE;
5818
	ap->qc_active &= ~(1 << qc->tag);
5819

L
Linus Torvalds 已提交
5820
	/* call completion callback */
5821
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5822 5823
}

5824 5825 5826 5827 5828
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5829
	ap->ops->tf_read(ap, &qc->result_tf);
5830 5831
}

5832 5833 5834 5835 5836 5837 5838 5839 5840
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *	@err_mask: ATA Status register contents
 *
 *	Indicate to the mid and upper layers that an ATA
 *	command has completed, with either an ok or not-ok status.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5841
 *	spin_lock_irqsave(host lock)
5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860
 */
void ata_qc_complete(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	/* XXX: New EH and old EH use different mechanisms to
	 * synchronize EH with regular execution path.
	 *
	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
	 * Normal execution path is responsible for not accessing a
	 * failed qc.  libata core enforces the rule by returning NULL
	 * from ata_qc_from_tag() for failed qcs.
	 *
	 * Old EH depends on ata_qc_complete() nullifying completion
	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
	 * not synchronize with interrupt handler.  Only PIO task is
	 * taken care of.
	 */
	if (ap->ops->error_handler) {
5861 5862 5863
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

5864
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5865 5866 5867 5868 5869 5870 5871

		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			if (!ata_tag_internal(qc->tag)) {
				/* always fill result TF for failed qc */
5872
				fill_result_tf(qc);
5873 5874 5875 5876 5877 5878 5879
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5880
			fill_result_tf(qc);
5881

5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896
		/* Some commands need post-processing after successful
		 * completion.
		 */
		switch (qc->tf.command) {
		case ATA_CMD_SET_FEATURES:
			if (qc->tf.feature != SETFEATURES_WC_ON &&
			    qc->tf.feature != SETFEATURES_WC_OFF)
				break;
			/* fall through */
		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
		case ATA_CMD_SET_MULTI: /* multi_count changed */
			/* revalidate device */
			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
			ata_port_schedule_eh(ap);
			break;
5897 5898 5899 5900

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
5901 5902
		}

5903 5904 5905 5906 5907 5908 5909
		__ata_qc_complete(qc);
	} else {
		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
			return;

		/* read result TF if failed or requested */
		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5910
			fill_result_tf(qc);
5911 5912 5913 5914 5915

		__ata_qc_complete(qc);
	}
}

5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *	@finish_qc: LLDD callback invoked before completing a qc
 *
 *	Complete in-flight commands.  This functions is meant to be
 *	called from low-level driver's interrupt routine to complete
 *	requests normally.  ap->qc_active and @qc_active is compared
 *	and commands are completed accordingly.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5928
 *	spin_lock_irqsave(host lock)
5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
			     void (*finish_qc)(struct ata_queued_cmd *))
{
	int nr_done = 0;
	u32 done_mask;
	int i;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
		ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
				"(%08x->%08x)\n", ap->qc_active, qc_active);
		return -EINVAL;
	}

	for (i = 0; i < ATA_MAX_QUEUE; i++) {
		struct ata_queued_cmd *qc;

		if (!(done_mask & (1 << i)))
			continue;

		if ((qc = ata_qc_from_tag(ap, i))) {
			if (finish_qc)
				finish_qc(qc);
			ata_qc_complete(qc);
			nr_done++;
		}
	}

	return nr_done;
}

L
Linus Torvalds 已提交
5965 5966 5967 5968 5969
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5970
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998
	case ATA_PROT_DMA:
	case ATA_PROT_ATAPI_DMA:
		return 1;

	case ATA_PROT_ATAPI:
	case ATA_PROT_PIO:
		if (ap->flags & ATA_FLAG_PIO_DMA)
			return 1;

		/* fall through */

	default:
		return 0;
	}

	/* never reached */
}

/**
 *	ata_qc_issue - issue taskfile to device
 *	@qc: command to issue to device
 *
 *	Prepare an ATA command to submission to device.
 *	This includes mapping the data into a DMA-able
 *	area, filling in the S/G table, and finally
 *	writing the taskfile to hardware, starting the command.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5999
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
6000
 */
6001
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
6002 6003
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
6004
	struct ata_link *link = qc->dev->link;
L
Linus Torvalds 已提交
6005

6006 6007 6008 6009
	/* Make sure only one non-NCQ command is outstanding.  The
	 * check is skipped for old EH because it reuses active qc to
	 * request ATAPI sense.
	 */
T
Tejun Heo 已提交
6010
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
6011 6012

	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
6013
		WARN_ON(link->sactive & (1 << qc->tag));
6014 6015 6016

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
6017
		link->sactive |= 1 << qc->tag;
6018
	} else {
T
Tejun Heo 已提交
6019
		WARN_ON(link->sactive);
6020 6021

		ap->nr_active_links++;
T
Tejun Heo 已提交
6022
		link->active_tag = qc->tag;
6023 6024
	}

6025
	qc->flags |= ATA_QCFLAG_ACTIVE;
6026
	ap->qc_active |= 1 << qc->tag;
6027

L
Linus Torvalds 已提交
6028 6029 6030
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
6031
				goto sg_err;
L
Linus Torvalds 已提交
6032 6033
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
6034
				goto sg_err;
L
Linus Torvalds 已提交
6035 6036 6037 6038 6039
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

6040 6041 6042 6043 6044 6045 6046 6047
	/* if device is sleeping, schedule softreset and abort the link */
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
		link->eh_info.action |= ATA_EH_SOFTRESET;
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
6048 6049
	ap->ops->qc_prep(qc);

6050 6051 6052 6053
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
6054

6055 6056
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
6057 6058 6059
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070
}

/**
 *	ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
 *	@qc: command to issue to device
 *
 *	Using various libata functions and hooks, this function
 *	starts an ATA command.  ATA commands are grouped into
 *	classes called "protocols", and issuing each type of protocol
 *	is slightly different.
 *
E
Edward Falk 已提交
6071 6072
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
6073
 *	LOCKING:
J
Jeff Garzik 已提交
6074
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
6075 6076
 *
 *	RETURNS:
6077
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
6078 6079
 */

6080
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
6081 6082 6083
{
	struct ata_port *ap = qc->ap;

6084 6085 6086 6087 6088 6089
	/* Use polling pio if the LLD doesn't handle
	 * interrupt driven pio and atapi CDB interrupt.
	 */
	if (ap->flags & ATA_FLAG_PIO_POLLING) {
		switch (qc->tf.protocol) {
		case ATA_PROT_PIO:
6090
		case ATA_PROT_NODATA:
6091 6092 6093 6094 6095 6096
		case ATA_PROT_ATAPI:
		case ATA_PROT_ATAPI_NODATA:
			qc->tf.flags |= ATA_TFLAG_POLLING;
			break;
		case ATA_PROT_ATAPI_DMA:
			if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
6097
				/* see ata_dma_blacklisted() */
6098 6099 6100 6101 6102 6103 6104
				BUG();
			break;
		default:
			break;
		}
	}

6105
	/* select the device */
L
Linus Torvalds 已提交
6106 6107
	ata_dev_select(ap, qc->dev->devno, 1, 0);

6108
	/* start the command */
L
Linus Torvalds 已提交
6109 6110
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
6111 6112 6113
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
6114
		ata_tf_to_host(ap, &qc->tf);
6115 6116 6117
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
6118
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
6119

L
Linus Torvalds 已提交
6120 6121 6122
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
6123
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6124

L
Linus Torvalds 已提交
6125 6126 6127
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
		ap->ops->bmdma_start(qc);	    /* initiate bmdma */
6128
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
6129 6130
		break;

6131 6132 6133
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
6134

J
Jeff Garzik 已提交
6135
		ata_tf_to_host(ap, &qc->tf);
6136

6137 6138 6139
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
6140
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
6141 6142

			/* always send first data block using
6143
			 * the ata_pio_task() codepath.
6144
			 */
6145
		} else {
6146 6147 6148 6149
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
6150
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
6151 6152 6153 6154

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
6155 6156
		}

L
Linus Torvalds 已提交
6157 6158 6159 6160
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
6161 6162 6163
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
6164
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
6165

6166 6167 6168 6169 6170
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
		    (qc->tf.flags & ATA_TFLAG_POLLING))
6171
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
6172 6173 6174
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
6175
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
6176

L
Linus Torvalds 已提交
6177 6178
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
6179 6180 6181 6182
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
6183
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
6184 6185 6186 6187
		break;

	default:
		WARN_ON(1);
6188
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203
	}

	return 0;
}

/**
 *	ata_host_intr - Handle host interrupt for given (port, task)
 *	@ap: Port on which interrupt arrived (possibly...)
 *	@qc: Taskfile currently active in engine
 *
 *	Handle host interrupt for given queued command.  Currently,
 *	only DMA interrupts are handled.  All other commands are
 *	handled via polling with interrupts disabled (nIEN bit).
 *
 *	LOCKING:
J
Jeff Garzik 已提交
6204
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
6205 6206 6207 6208 6209
 *
 *	RETURNS:
 *	One if interrupt was handled, zero if not (shared irq).
 */

6210 6211
inline unsigned int ata_host_intr(struct ata_port *ap,
				  struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
6212
{
T
Tejun Heo 已提交
6213
	struct ata_eh_info *ehi = &ap->link.eh_info;
6214
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
6215

6216
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
6217
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
6218

6219 6220 6221
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
6222 6223 6224
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
6225

6226 6227 6228 6229 6230
		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
		 * The flag was turned on only for atapi devices.
		 * No need to check is_atapi_taskfile(&qc->tf) again.
		 */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
L
Linus Torvalds 已提交
6231 6232
			goto idle_irq;
		break;
6233 6234 6235 6236 6237
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
6238 6239
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
6240 6241 6242 6243 6244 6245 6246

			/* if it's not our irq... */
			if (!(host_stat & ATA_DMA_INTR))
				goto idle_irq;

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
6247 6248 6249 6250 6251 6252

			if (unlikely(host_stat & ATA_DMA_ERR)) {
				/* error when transfering data to/from memory */
				qc->err_mask |= AC_ERR_HOST_BUS;
				ap->hsm_task_state = HSM_ST_ERR;
			}
6253 6254 6255 6256
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
6257 6258 6259 6260
	default:
		goto idle_irq;
	}

6261 6262 6263 6264
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
6265

6266 6267 6268 6269
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
6270

6271 6272
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
6273

6274
	ata_hsm_move(ap, qc, status, 0);
6275 6276 6277 6278 6279

	if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
				       qc->tf.protocol == ATA_PROT_ATAPI_DMA))
		ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);

L
Linus Torvalds 已提交
6280 6281 6282 6283 6284 6285 6286
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
6287 6288
		ata_chk_status(ap);
		ap->ops->irq_clear(ap);
6289
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
6290
		return 1;
L
Linus Torvalds 已提交
6291 6292 6293 6294 6295 6296 6297
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
6298
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
6299
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
6300
 *
J
Jeff Garzik 已提交
6301 6302 6303
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
6304
 *	LOCKING:
J
Jeff Garzik 已提交
6305
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
6306 6307
 *
 *	RETURNS:
J
Jeff Garzik 已提交
6308
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
6309 6310
 */

6311
irqreturn_t ata_interrupt(int irq, void *dev_instance)
L
Linus Torvalds 已提交
6312
{
J
Jeff Garzik 已提交
6313
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
6314 6315 6316 6317 6318
	unsigned int i;
	unsigned int handled = 0;
	unsigned long flags;

	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
J
Jeff Garzik 已提交
6319
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
6320

J
Jeff Garzik 已提交
6321
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
6322 6323
		struct ata_port *ap;

J
Jeff Garzik 已提交
6324
		ap = host->ports[i];
6325
		if (ap &&
J
Jeff Garzik 已提交
6326
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
6327 6328
			struct ata_queued_cmd *qc;

T
Tejun Heo 已提交
6329
			qc = ata_qc_from_tag(ap, ap->link.active_tag);
6330
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6331
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
6332 6333 6334 6335
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
6336
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
6337 6338 6339 6340

	return IRQ_RETVAL(handled);
}

6341 6342
/**
 *	sata_scr_valid - test whether SCRs are accessible
6343
 *	@link: ATA link to test SCR accessibility for
6344
 *
6345
 *	Test whether SCRs are accessible for @link.
6346 6347 6348 6349 6350 6351 6352
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
6353
int sata_scr_valid(struct ata_link *link)
6354
{
6355 6356
	struct ata_port *ap = link->ap;

6357
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6358 6359 6360 6361
}

/**
 *	sata_scr_read - read SCR register of the specified port
6362
 *	@link: ATA link to read SCR for
6363 6364 6365
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
6366
 *	Read SCR register @reg of @link into *@val.  This function is
6367 6368
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6369 6370
 *
 *	LOCKING:
6371
 *	None if @link is ap->link.  Kernel thread context otherwise.
6372 6373 6374 6375
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6376
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6377
{
6378 6379
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
6380

6381 6382 6383 6384 6385 6386
		if (sata_scr_valid(link))
			return ap->ops->scr_read(ap, reg, val);
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
6387 6388 6389 6390
}

/**
 *	sata_scr_write - write SCR register of the specified port
6391
 *	@link: ATA link to write SCR for
6392 6393 6394
 *	@reg: SCR to write
 *	@val: value to write
 *
6395
 *	Write @val to SCR register @reg of @link.  This function is
6396 6397
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6398 6399
 *
 *	LOCKING:
6400
 *	None if @link is ap->link.  Kernel thread context otherwise.
6401 6402 6403 6404
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6405
int sata_scr_write(struct ata_link *link, int reg, u32 val)
6406
{
6407 6408 6409 6410 6411 6412 6413
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;

		if (sata_scr_valid(link))
			return ap->ops->scr_write(ap, reg, val);
		return -EOPNOTSUPP;
	}
6414

6415
	return sata_pmp_scr_write(link, reg, val);
6416 6417 6418 6419
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
6420
 *	@link: ATA link to write SCR for
6421 6422 6423 6424 6425 6426 6427
 *	@reg: SCR to write
 *	@val: value to write
 *
 *	This function is identical to sata_scr_write() except that this
 *	function performs flush after writing to the register.
 *
 *	LOCKING:
6428
 *	None if @link is ap->link.  Kernel thread context otherwise.
6429 6430 6431 6432
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6433
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6434
{
6435 6436 6437
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
		int rc;
6438

6439 6440 6441 6442 6443 6444 6445
		if (sata_scr_valid(link)) {
			rc = ap->ops->scr_write(ap, reg, val);
			if (rc == 0)
				rc = ap->ops->scr_read(ap, reg, &val);
			return rc;
		}
		return -EOPNOTSUPP;
6446
	}
6447 6448

	return sata_pmp_scr_write(link, reg, val);
6449 6450 6451
}

/**
6452 6453
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
6454
 *
6455 6456 6457
 *	Test whether @link is online.  Note that this function returns
 *	0 if online status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
6458 6459 6460 6461 6462 6463 6464
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
6465
int ata_link_online(struct ata_link *link)
6466 6467 6468
{
	u32 sstatus;

6469 6470
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
6471 6472 6473 6474 6475
		return 1;
	return 0;
}

/**
6476 6477
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
6478
 *
6479 6480 6481
 *	Test whether @link is offline.  Note that this function
 *	returns 0 if offline status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
6482 6483 6484 6485 6486 6487 6488
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
6489
int ata_link_offline(struct ata_link *link)
6490 6491 6492
{
	u32 sstatus;

6493 6494
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
6495 6496 6497
		return 1;
	return 0;
}
E
Edward Falk 已提交
6498

6499
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
6500
{
6501
	unsigned int err_mask;
J
Jens Axboe 已提交
6502 6503 6504 6505 6506
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

6507
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
6508 6509 6510 6511
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

6512 6513
	/* This is wrong. On a failed flush we get back the LBA of the lost
	   sector and we should (assuming it wasn't aborted as unknown) issue
6514
	   a further flush command to continue the writeback until it
6515
	   does not error */
6516 6517 6518 6519 6520 6521 6522
	err_mask = ata_do_simple_cmd(dev, cmd);
	if (err_mask) {
		ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
		return -EIO;
	}

	return 0;
J
Jens Axboe 已提交
6523 6524
}

6525
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6526 6527 6528
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
6529 6530 6531 6532
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
6533 6534
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6535
		struct ata_link *link;
6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554

		/* Previous resume operation might still be in
		 * progress.  Wait for PM_PENDING to clear.
		 */
		if (ap->pflags & ATA_PFLAG_PM_PENDING) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
		}

		/* request PM ops to EH */
		spin_lock_irqsave(ap->lock, flags);

		ap->pm_mesg = mesg;
		if (wait) {
			rc = 0;
			ap->pm_result = &rc;
		}

		ap->pflags |= ATA_PFLAG_PM_PENDING;
6555 6556 6557 6558
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576

		ata_port_schedule_eh(ap);

		spin_unlock_irqrestore(ap->lock, flags);

		/* wait and check result */
		if (wait) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
			if (rc)
				return rc;
		}
	}

	return 0;
}

/**
J
Jeff Garzik 已提交
6577 6578
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
6579 6580
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
6581
 *	Suspend @host.  Actual operation is performed by EH.  This
6582 6583 6584 6585 6586 6587 6588 6589 6590
 *	function requests EH to perform PM operations and waits for EH
 *	to finish.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
J
Jeff Garzik 已提交
6591
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6592
{
6593
	int rc;
6594

6595 6596 6597 6598 6599 6600
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
6601
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6602 6603
	if (rc == 0)
		host->dev->power.power_state = mesg;
6604 6605 6606 6607
	return rc;
}

/**
J
Jeff Garzik 已提交
6608 6609
 *	ata_host_resume - resume host
 *	@host: host to resume
6610
 *
J
Jeff Garzik 已提交
6611
 *	Resume @host.  Actual operation is performed by EH.  This
6612 6613 6614 6615 6616 6617
 *	function requests EH to perform PM operations and returns.
 *	Note that all resume operations are performed parallely.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
J
Jeff Garzik 已提交
6618
void ata_host_resume(struct ata_host *host)
6619
{
J
Jeff Garzik 已提交
6620 6621 6622
	ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
	host->dev->power.power_state = PMSG_ON;
6623 6624 6625

	/* reenable link pm */
	ata_lpm_disable(host);
6626
}
6627
#endif
6628

6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640
/**
 *	ata_port_start - Set port up for dma.
 *	@ap: Port to initialize
 *
 *	Called just after data structures for each port are
 *	initialized.  Allocates space for PRD table.
 *
 *	May be used as the port_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
6641
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
6642
{
6643
	struct device *dev = ap->dev;
6644
	int rc;
L
Linus Torvalds 已提交
6645

6646 6647
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
6648 6649 6650
	if (!ap->prd)
		return -ENOMEM;

6651
	rc = ata_pad_alloc(ap, dev);
6652
	if (rc)
6653
		return rc;
L
Linus Torvalds 已提交
6654

6655 6656
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
6657 6658 6659
	return 0;
}

6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670
/**
 *	ata_dev_init - Initialize an ata_device structure
 *	@dev: Device structure to initialize
 *
 *	Initialize @dev in preparation for probing.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
void ata_dev_init(struct ata_device *dev)
{
T
Tejun Heo 已提交
6671 6672
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
6673 6674
	unsigned long flags;

6675
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
6676 6677
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
6678

6679 6680
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6681
	 * host lock.
6682
	 */
6683
	spin_lock_irqsave(ap->lock, flags);
6684
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6685
	dev->horkage = 0;
6686
	spin_unlock_irqrestore(ap->lock, flags);
6687

6688 6689
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6690 6691 6692 6693 6694
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

6695 6696 6697 6698
/**
 *	ata_link_init - Initialize an ata_link structure
 *	@ap: ATA port link is attached to
 *	@link: Link structure to initialize
T
Tejun Heo 已提交
6699
 *	@pmp: Port multiplier port number
6700 6701 6702 6703 6704 6705
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
6706
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6707 6708 6709 6710 6711 6712 6713
{
	int i;

	/* clear everything except for devices */
	memset(link, 0, offsetof(struct ata_link, device[0]));

	link->ap = ap;
T
Tejun Heo 已提交
6714
	link->pmp = pmp;
6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

	/* can't use iterator, ap isn't initialized yet */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &link->device[i];

		dev->link = link;
		dev->devno = dev - link->device;
		ata_dev_init(dev);
	}
}

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
6741
int sata_link_init_spd(struct ata_link *link)
6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758
{
	u32 scontrol, spd;
	int rc;

	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
	if (rc)
		return rc;

	spd = (scontrol >> 4) & 0xf;
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
6759
/**
6760 6761
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6762
 *
6763 6764 6765 6766
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6767
 *
L
Linus Torvalds 已提交
6768
 *	LOCKING:
6769
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6770
 */
6771
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6772
{
6773
	struct ata_port *ap;
L
Linus Torvalds 已提交
6774

6775 6776 6777 6778 6779 6780
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;

6781
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6782
	ap->lock = &host->lock;
6783
	ap->flags = ATA_FLAG_DISABLED;
6784
	ap->print_id = -1;
L
Linus Torvalds 已提交
6785
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6786
	ap->host = host;
6787
	ap->dev = host->dev;
L
Linus Torvalds 已提交
6788
	ap->last_ctl = 0xFF;
6789 6790 6791 6792 6793 6794

#if defined(ATA_VERBOSE_DEBUG)
	/* turn on all debugging levels */
	ap->msg_enable = 0x00FF;
#elif defined(ATA_DEBUG)
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
T
Tejun Heo 已提交
6795
#else
6796
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6797
#endif
L
Linus Torvalds 已提交
6798

6799 6800 6801
	INIT_DELAYED_WORK(&ap->port_task, NULL);
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6802
	INIT_LIST_HEAD(&ap->eh_done_q);
6803
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6804 6805 6806
	init_timer_deferrable(&ap->fastdrain_timer);
	ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
	ap->fastdrain_timer.data = (unsigned long)ap;
L
Linus Torvalds 已提交
6807

6808 6809
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
6810
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
6811 6812 6813 6814 6815 6816 6817 6818

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
	return ap;
}

6819 6820 6821 6822 6823
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

6824 6825 6826
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6827 6828 6829 6830
		if (!ap)
			continue;

		if (ap->scsi_host)
6831 6832
			scsi_host_put(ap->scsi_host);

6833
		kfree(ap->pmp_link);
6834
		kfree(ap);
6835 6836 6837
		host->ports[i] = NULL;
	}

6838
	dev_set_drvdata(gendev, NULL);
6839 6840
}

6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883 6884 6885 6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899 6900 6901 6902 6903 6904 6905
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return NULL;

	/* alloc a container for our list of ATA ports (buses) */
	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
	/* alloc a container for our list of ATA ports (buses) */
	host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
	if (!host)
		goto err_out;

	devres_add(dev, host);
	dev_set_drvdata(dev, host);

	spin_lock_init(&host->lock);
	host->dev = dev;
	host->n_ports = max_ports;

	/* allocate ports bound to this host */
	for (i = 0; i < max_ports; i++) {
		struct ata_port *ap;

		ap = ata_port_alloc(host);
		if (!ap)
			goto err_out;

		ap->port_no = i;
		host->ports[i] = ap;
	}

	devres_remove_group(dev, NULL);
	return host;

 err_out:
	devres_release_group(dev, NULL);
	return NULL;
}

6906 6907 6908 6909 6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923 6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

	host = ata_host_alloc(dev, n_ports);
	if (!host)
		return NULL;

	for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (ppi[j])
			pi = ppi[j++];

		ap->pio_mask = pi->pio_mask;
		ap->mwdma_mask = pi->mwdma_mask;
		ap->udma_mask = pi->udma_mask;
		ap->flags |= pi->flags;
6944
		ap->link.flags |= pi->link_flags;
6945 6946 6947 6948 6949 6950 6951 6952 6953 6954 6955
		ap->ops = pi->port_ops;

		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
			host->ops = pi->port_ops;
		if (!host->private_data && pi->private_data)
			host->private_data = pi->private_data;
	}

	return host;
}

6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969 6970 6971 6972 6973
static void ata_host_stop(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

	WARN_ON(!(host->flags & ATA_HOST_STARTED));

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
}

6974 6975 6976 6977 6978 6979 6980
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
6981 6982
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6983 6984 6985 6986 6987 6988 6989 6990 6991
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
6992 6993
	int have_stop = 0;
	void *start_dr = NULL;
6994 6995 6996 6997 6998 6999 7000 7001
	int i, rc;

	if (host->flags & ATA_HOST_STARTED)
		return 0;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

7002 7003 7004
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020
		if (ap->ops->port_stop)
			have_stop = 1;
	}

	if (host->ops->host_stop)
		have_stop = 1;

	if (have_stop) {
		start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
		if (!start_dr)
			return -ENOMEM;
	}

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
				ata_port_printk(ap, KERN_ERR, "failed to "
						"start port (errno=%d)\n", rc);
				goto err_out;
			}
		}

		ata_eh_freeze_port(ap);
	}

7033 7034
	if (start_dr)
		devres_add(host->dev, start_dr);
7035 7036 7037 7038 7039 7040 7041 7042 7043 7044
	host->flags |= ATA_HOST_STARTED;
	return 0;

 err_out:
	while (--i >= 0) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}
7045
	devres_free(start_dr);
7046 7047 7048
	return rc;
}

7049
/**
J
Jeff Garzik 已提交
7050 7051 7052 7053 7054
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
7055 7056 7057 7058 7059
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
7060
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
7061 7062
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
7063
{
J
Jeff Garzik 已提交
7064 7065 7066 7067
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
7068 7069
}

7070 7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092 7093 7094 7095 7096 7097 7098 7099 7100 7101 7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7112
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
		dev_printk(KERN_ERR, host->dev,
			   "BUG: trying to register unstarted host\n");
		WARN_ON(1);
		return -EINVAL;
	}

	/* Blow away unused ports.  This happens when LLD can't
	 * determine the exact number of ports to allocate at
	 * allocation time.
	 */
	for (i = host->n_ports; host->ports[i]; i++)
		kfree(host->ports[i]);

	/* give ports names and add SCSI hosts */
	for (i = 0; i < host->n_ports; i++)
		host->ports[i]->print_id = ata_print_id++;

	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
		return rc;

7113 7114 7115
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

7116 7117 7118 7119 7120 7121 7122 7123 7124 7125
	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		unsigned long xfer_mask;

		/* set SATA cable type if still unset */
		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
			ap->cbl = ATA_CBL_SATA;

		/* init sata_spd_limit to the current value */
7126
		sata_link_init_spd(&ap->link);
7127

7128
		/* print per-port info to dmesg */
7129 7130 7131
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

7132
		if (!ata_port_is_dummy(ap)) {
7133 7134
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
7135
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
7136
					ata_mode_string(xfer_mask),
7137
					ap->link.eh_info.desc);
7138 7139
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int rc;

		/* probe */
		if (ap->ops->error_handler) {
T
Tejun Heo 已提交
7151
			struct ata_eh_info *ehi = &ap->link.eh_info;
7152 7153 7154 7155 7156 7157 7158
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
			spin_lock_irqsave(ap->lock, flags);

7159 7160
			ehi->probe_mask =
				(1 << ata_link_max_devices(&ap->link)) - 1;
7161 7162 7163
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

7164
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
7165 7166 7167 7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184 7185 7186 7187 7188 7189 7190 7191 7192
			ap->pflags |= ATA_PFLAG_LOADING;
			ata_port_schedule_eh(ap);

			spin_unlock_irqrestore(ap->lock, flags);

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
			rc = ata_bus_probe(ap);
			DPRINTK("ata%u: bus probe end\n", ap->print_id);

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
	}

	/* probes are done, now scan each port's disk(s) */
	DPRINTK("host probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

7193
		ata_scsi_scan_host(ap, 1);
7194
		ata_lpm_schedule(ap, ap->pm_policy);
7195 7196 7197 7198 7199
	}

	return 0;
}

7200 7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
7213 7214 7215 7216
 *	An invalid IRQ skips the IRQ registration and expects the host to
 *	have set polling mode on the port. In this case, @irq_handler
 *	should be NULL.
 *
7217 7218 7219 7220 7221 7222 7223 7224 7225 7226
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
7227
	int i, rc;
7228 7229 7230 7231 7232

	rc = ata_host_start(host);
	if (rc)
		return rc;

7233 7234 7235 7236 7237 7238
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

7239 7240 7241 7242 7243
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

7244 7245
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
7246

7247 7248 7249 7250 7251 7252 7253 7254
	rc = ata_host_register(host, sht);
	/* if failed, just free the IRQ and leave ports alone */
	if (rc)
		devm_free_irq(host->dev, irq, host);

	return rc;
}

7255 7256 7257 7258 7259 7260 7261 7262 7263 7264 7265
/**
 *	ata_port_detach - Detach ATA port in prepration of device removal
 *	@ap: ATA port to be detached
 *
 *	Detach all ATA devices and the associated SCSI devices of @ap;
 *	then, remove the associated SCSI host.  @ap is guaranteed to
 *	be quiescent on return from this function.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
7266
static void ata_port_detach(struct ata_port *ap)
7267 7268
{
	unsigned long flags;
7269
	struct ata_link *link;
7270
	struct ata_device *dev;
7271 7272

	if (!ap->ops->error_handler)
7273
		goto skip_eh;
7274 7275

	/* tell EH we're leaving & flush EH */
7276
	spin_lock_irqsave(ap->lock, flags);
7277
	ap->pflags |= ATA_PFLAG_UNLOADING;
7278
	spin_unlock_irqrestore(ap->lock, flags);
7279 7280 7281 7282 7283 7284

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
7285
	spin_lock_irqsave(ap->lock, flags);
7286

7287 7288 7289 7290
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
7291

7292
	spin_unlock_irqrestore(ap->lock, flags);
7293 7294 7295 7296 7297

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
7298
	spin_lock_irqsave(ap->lock, flags);
7299
	ata_port_freeze(ap);	/* won't be thawed */
7300
	spin_unlock_irqrestore(ap->lock, flags);
7301 7302

	ata_port_wait_eh(ap);
7303
	cancel_rearming_delayed_work(&ap->hotplug_task);
7304

7305
 skip_eh:
7306
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
7307
	scsi_remove_host(ap->scsi_host);
7308 7309
}

T
Tejun Heo 已提交
7310 7311 7312 7313 7314 7315 7316 7317 7318 7319 7320 7321 7322 7323 7324 7325 7326
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
}

L
Linus Torvalds 已提交
7327 7328 7329
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
7330 7331 7332 7333 7334 7335 7336
 *
 *	Utility function which initializes data_addr, error_addr,
 *	feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
 *	device_addr, status_addr, and command_addr to standard offsets
 *	relative to cmd_addr.
 *
 *	Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
L
Linus Torvalds 已提交
7337
 */
E
Edward Falk 已提交
7338

L
Linus Torvalds 已提交
7339 7340 7341 7342 7343 7344 7345 7346 7347 7348 7349 7350 7351 7352
void ata_std_ports(struct ata_ioports *ioaddr)
{
	ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
	ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
	ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
	ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
	ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
	ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
	ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
	ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
	ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
	ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
}

E
Edward Falk 已提交
7353

7354 7355
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
7356 7357 7358 7359
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
7360 7361 7362
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
7363 7364 7365 7366
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
7367
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
7368
{
7369
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
7370
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
7371

T
Tejun Heo 已提交
7372
	ata_host_detach(host);
L
Linus Torvalds 已提交
7373 7374 7375
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
7376
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
7377 7378 7379 7380 7381 7382 7383 7384 7385 7386 7387 7388 7389 7390 7391 7392 7393 7394 7395 7396 7397 7398 7399 7400 7401 7402 7403 7404 7405 7406 7407
{
	unsigned long tmp = 0;

	switch (bits->width) {
	case 1: {
		u8 tmp8 = 0;
		pci_read_config_byte(pdev, bits->reg, &tmp8);
		tmp = tmp8;
		break;
	}
	case 2: {
		u16 tmp16 = 0;
		pci_read_config_word(pdev, bits->reg, &tmp16);
		tmp = tmp16;
		break;
	}
	case 4: {
		u32 tmp32 = 0;
		pci_read_config_dword(pdev, bits->reg, &tmp32);
		tmp = tmp32;
		break;
	}

	default:
		return -EINVAL;
	}

	tmp &= bits->mask;

	return (tmp == bits->val) ? 1 : 0;
}
J
Jens Axboe 已提交
7408

7409
#ifdef CONFIG_PM
7410
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
7411 7412
{
	pci_save_state(pdev);
7413
	pci_disable_device(pdev);
7414

7415
	if (mesg.event == PM_EVENT_SUSPEND)
7416
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
7417 7418
}

7419
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
7420
{
7421 7422
	int rc;

J
Jens Axboe 已提交
7423 7424
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
7425

T
Tejun Heo 已提交
7426
	rc = pcim_enable_device(pdev);
7427 7428 7429 7430 7431 7432
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
7433
	pci_set_master(pdev);
7434
	return 0;
7435 7436
}

7437
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7438
{
J
Jeff Garzik 已提交
7439
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7440 7441
	int rc = 0;

J
Jeff Garzik 已提交
7442
	rc = ata_host_suspend(host, mesg);
7443 7444 7445
	if (rc)
		return rc;

7446
	ata_pci_device_do_suspend(pdev, mesg);
7447 7448 7449 7450 7451 7452

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
7453
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7454
	int rc;
7455

7456 7457 7458 7459
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
7460
}
7461 7462
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
7463 7464 7465 7466 7467
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
7468
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
7469 7470 7471 7472
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

7473 7474 7475 7476 7477 7478
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
7479 7480 7481 7482 7483 7484 7485
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
7486
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
7487 7488
}

7489
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
7490 7491
module_exit(ata_exit);

7492
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
7493
static DEFINE_SPINLOCK(ata_ratelimit_lock);
7494 7495 7496 7497 7498 7499 7500 7501 7502 7503 7504 7505 7506 7507 7508 7509 7510 7511 7512

int ata_ratelimit(void)
{
	int rc;
	unsigned long flags;

	spin_lock_irqsave(&ata_ratelimit_lock, flags);

	if (time_after(jiffies, ratelimit_time)) {
		rc = 1;
		ratelimit_time = jiffies + (HZ/5);
	} else
		rc = 0;

	spin_unlock_irqrestore(&ata_ratelimit_lock, flags);

	return rc;
}

7513 7514 7515 7516 7517 7518 7519 7520 7521 7522 7523 7524 7525 7526 7527 7528 7529 7530 7531 7532 7533 7534 7535 7536 7537 7538 7539 7540 7541 7542 7543 7544 7545 7546 7547 7548 7549 7550 7551 7552 7553 7554 7555 7556 7557 7558
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

	/* Calculate timeout _after_ the first read to make sure
	 * preceding writes reach the controller before starting to
	 * eat away the timeout.
	 */
	timeout = jiffies + (timeout_msec * HZ) / 1000;

	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
		msleep(interval_msec);
		tmp = ioread32(reg);
	}

	return tmp;
}

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Tejun Heo 已提交
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/*
 * Dummy port_ops
 */
static void ata_dummy_noret(struct ata_port *ap)	{ }
static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }

static u8 ata_dummy_check_status(struct ata_port *ap)
{
	return ATA_DRDY;
}

static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
{
	return AC_ERR_SYSTEM;
}

const struct ata_port_operations ata_dummy_port_ops = {
	.check_status		= ata_dummy_check_status,
	.check_altstatus	= ata_dummy_check_status,
	.dev_select		= ata_noop_dev_select,
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
	.freeze			= ata_dummy_noret,
	.thaw			= ata_dummy_noret,
	.error_handler		= ata_dummy_noret,
	.post_internal_cmd	= ata_dummy_qc_noret,
	.irq_clear		= ata_dummy_noret,
	.port_start		= ata_dummy_ret0,
	.port_stop		= ata_dummy_noret,
};

7591 7592 7593 7594
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

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Linus Torvalds 已提交
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/*
 * libata is essentially a library of internal helper functions for
 * low-level ATA host controller drivers.  As such, the API/ABI is
 * likely to change as new drivers are added and updated.
 * Do not depend on ABI/API stability.
 */
7601 7602 7603
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
T
Tejun Heo 已提交
7604
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7605
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
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Linus Torvalds 已提交
7606 7607
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
7608
EXPORT_SYMBOL_GPL(ata_host_init);
7609
EXPORT_SYMBOL_GPL(ata_host_alloc);
7610
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7611
EXPORT_SYMBOL_GPL(ata_host_start);
7612
EXPORT_SYMBOL_GPL(ata_host_register);
7613
EXPORT_SYMBOL_GPL(ata_host_activate);
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Tejun Heo 已提交
7614
EXPORT_SYMBOL_GPL(ata_host_detach);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
7617
EXPORT_SYMBOL_GPL(ata_hsm_move);
7618
EXPORT_SYMBOL_GPL(ata_qc_complete);
7619
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
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Linus Torvalds 已提交
7620 7621 7622 7623 7624
EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
7625
EXPORT_SYMBOL_GPL(sata_print_link_status);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
7632
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
7633
EXPORT_SYMBOL_GPL(ata_interrupt);
7634
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
7635 7636
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7637
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
L
Linus Torvalds 已提交
7638
EXPORT_SYMBOL_GPL(ata_qc_prep);
7639
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7640
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_bmdma_setup);
EXPORT_SYMBOL_GPL(ata_bmdma_start);
EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
EXPORT_SYMBOL_GPL(ata_bmdma_status);
EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7646 7647 7648 7649 7650
EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
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Linus Torvalds 已提交
7651
EXPORT_SYMBOL_GPL(ata_port_probe);
7652
EXPORT_SYMBOL_GPL(ata_dev_disable);
7653
EXPORT_SYMBOL_GPL(sata_set_spd);
7654 7655
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
7659
EXPORT_SYMBOL_GPL(ata_std_prereset);
7660
EXPORT_SYMBOL_GPL(ata_std_softreset);
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7661
EXPORT_SYMBOL_GPL(sata_link_hardreset);
7662 7663
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
7664 7665
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
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Linus Torvalds 已提交
7666
EXPORT_SYMBOL_GPL(ata_port_disable);
7667
EXPORT_SYMBOL_GPL(ata_ratelimit);
7668
EXPORT_SYMBOL_GPL(ata_wait_register);
7669
EXPORT_SYMBOL_GPL(ata_busy_sleep);
7670
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7671
EXPORT_SYMBOL_GPL(ata_wait_ready);
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Tejun Heo 已提交
7672
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
7673 7674 7675
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7676
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7677
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
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Linus Torvalds 已提交
7678
EXPORT_SYMBOL_GPL(ata_host_intr);
7679 7680 7681 7682
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7683 7684
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
7685
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
7686 7687
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
7688
#endif /* CONFIG_PM */
7689 7690
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
7691
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
L
Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_scsi_simulate);

7694
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
7695 7696 7697
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
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#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
7700
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
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Tejun Heo 已提交
7701
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7702
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
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Linus Torvalds 已提交
7703 7704
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7705
#ifdef CONFIG_PM
7706 7707
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
7708 7709
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7710
#endif /* CONFIG_PM */
A
Alan Cox 已提交
7711 7712
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
7713
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
7714

7715
EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7716 7717 7718 7719 7720
EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
EXPORT_SYMBOL_GPL(sata_pmp_do_eh);

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EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7724 7725 7726 7727
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
7728
EXPORT_SYMBOL_GPL(ata_eng_timeout);
7729
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7730
EXPORT_SYMBOL_GPL(ata_link_abort);
7731
EXPORT_SYMBOL_GPL(ata_port_abort);
7732
EXPORT_SYMBOL_GPL(ata_port_freeze);
7733
EXPORT_SYMBOL_GPL(sata_async_notification);
7734 7735
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7736 7737
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
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Tejun Heo 已提交
7738
EXPORT_SYMBOL_GPL(ata_do_eh);
7739
EXPORT_SYMBOL_GPL(ata_irq_on);
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Akira Iguchi 已提交
7740
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
7741 7742 7743 7744 7745

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
EXPORT_SYMBOL_GPL(ata_cable_sata);