libata-core.c 183.8 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 <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/io.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_AN(struct ata_device *dev, u8 enable);
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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 = 0;
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",
582 583 584 585 586 587 588 589 590
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
591
	int highbit;
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593 594 595
	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>";
}

599 600 601 602 603 604 605 606 607 608 609 610
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)
612
{
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	if (ata_dev_enabled(dev)) {
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		if (ata_msg_drv(dev->link->ap))
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			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
616 617
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
618 619 620 621
		dev->class++;
	}
}

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/**
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 *	ata_devchk - PATA device presence detection
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 *	@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)
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{
	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);
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	iowrite8(0xaa, ioaddr->nsect_addr);
	iowrite8(0x55, ioaddr->lbal_addr);
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	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
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	nsect = ioread8(ioaddr->nsect_addr);
	lbal = ioread8(ioaddr->lbal_addr);
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	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:
677 678
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
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{
	/* 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.
685 686 687 688 689 690 691 692 693 694 695 696 697 698
	 *
	 * 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.
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	 */
700
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

705
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

710 711 712 713 714 715 716 717 718 719
	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)) {
		printk("ata: SEMB device ignored\n");
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

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	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
726 727
 *	@dev: ATA device to classify (starting at zero)
 *	@present: device seems present
728
 *	@r_err: Value of error register on completion
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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.
741 742 743
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */
745 746
unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
				  u8 *r_err)
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{
748
	struct ata_port *ap = dev->link->ap;
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	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

753
	ap->ops->dev_select(ap, dev->devno);
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	memset(&tf, 0, sizeof(tf));

	ap->ops->tf_read(ap, &tf);
758
	err = tf.feature;
759 760
	if (r_err)
		*r_err = err;
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762
	/* see if device passed diags: if master then continue and warn later */
763
	if (err == 0 && dev->devno == 0)
764
		/* diagnostic fail : do nothing _YET_ */
765
		dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
766
	else if (err == 1)
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		/* do nothing */ ;
768
	else if ((dev->devno == 0) && (err == 0x81))
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		/* do nothing */ ;
	else
771
		return ATA_DEV_NONE;
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773
	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
775

776 777 778 779 780 781 782 783 784 785 786 787 788 789
	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;

790
	return class;
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}

/**
794
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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 *	@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.
 */

808 809
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

827
/**
828
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
829 830 831 832 833
 *	@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.
 *
834
 *	This function is identical to ata_id_string except that it
835 836 837 838 839 840
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
841 842
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
843 844 845 846 847
{
	unsigned char *p;

	WARN_ON(!(len & 1));

848
	ata_id_string(id, s, ofs, len - 1);
849 850 851 852 853 854

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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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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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;
}

/**
898 899 900
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
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 *
902 903
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
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 *
905 906 907
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
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 */
909
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
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{
911
	unsigned int err_mask;
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	struct ata_taskfile tf;
913
	int lba48 = ata_id_has_lba48(dev->id);
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	ata_tf_init(dev, &tf);

917
	/* always clear all address registers */
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	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

920 921 922 923 924
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
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	tf.protocol |= ATA_PROT_NODATA;
927 928
	tf.device |= ATA_LBA;

929
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
930 931 932 933 934 935 936
	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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938 939 940 941
	if (lba48)
		*max_sectors = ata_tf_to_lba48(&tf);
	else
		*max_sectors = ata_tf_to_lba(&tf);
942 943
        if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
		(*max_sectors)--;
944
	return 0;
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}

/**
948 949
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
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 *	@new_sectors: new max sectors value to set for the device
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 *
952 953 954 955 956 957
 *	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.
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 */
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static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
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{
961
	unsigned int err_mask;
A
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962
	struct ata_taskfile tf;
963
	int lba48 = ata_id_has_lba48(dev->id);
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	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
970 971 972 973 974 975 976 977

	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 {
979 980
		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;
985
	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;

991
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
992 993 994 995 996 997 998 999 1000 1001
	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;
1021
	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))
1027
		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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}

1100 1101 1102
/**
 *	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
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
 *
 *	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.
 */
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void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
{
}

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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.
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 *
 *	LOCKING:
 *	caller.
 */

void ata_std_dev_select (struct ata_port *ap, unsigned int device)
{
	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
1227
 *	@id: IDENTIFY DEVICE page to dump
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 *
1229 1230
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

1236
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",
1243 1244 1245 1246 1247
		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",
1253 1254 1255 1256 1257
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1260 1261
		id[88],
		id[93]);
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}

1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
/**
 *	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.
		 */
1293
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1294 1295 1296 1297
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307

		/* 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;
1308

1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325
	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);
	}

1326 1327 1328
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1329 1330 1331 1332

	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
1336
 *	@fn: workqueue function to be scheduled
1337
 *	@data: data for @fn to use
1338
 *	@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.
 */
1352
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
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			 unsigned long delay)
{
1355 1356
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
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1358 1359
	/* 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");

1376
	cancel_rearming_delayed_work(&ap->port_task);
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1378 1379
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
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}

1382
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1383
{
1384
	struct completion *waiting = qc->private_data;
1385 1386 1387 1388 1389

	complete(waiting);
}

/**
1390
 *	ata_exec_internal_sg - execute libata internal command
1391 1392
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1393
 *	@cdb: CDB for packet command
1394
 *	@dma_dir: Data tranfer direction of the command
1395 1396
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1397
 *	@timeout: Timeout in msecs (0 for default)
1398 1399 1400 1401 1402 1403 1404 1405 1406
 *
 *	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.
1407 1408 1409
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1410
 */
1411 1412 1413
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
			      int dma_dir, struct scatterlist *sg,
1414
			      unsigned int n_elem, unsigned long timeout)
1415
{
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	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1418 1419
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1420
	unsigned int tag, preempted_tag;
1421
	u32 preempted_sactive, preempted_qc_active;
1422
	int preempted_nr_active_links;
1423
	DECLARE_COMPLETION_ONSTACK(wait);
1424
	unsigned long flags;
1425
	unsigned int err_mask;
1426
	int rc;
1427

1428
	spin_lock_irqsave(ap->lock, flags);
1429

1430
	/* no internal command while frozen */
1431
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1432
		spin_unlock_irqrestore(ap->lock, flags);
1433 1434 1435
		return AC_ERR_SYSTEM;
	}

1436
	/* initialize internal qc */
1437

1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	/* 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;

1448
	if (test_and_set_bit(tag, &ap->qc_allocated))
1449
		BUG();
1450
	qc = __ata_qc_from_tag(ap, tag);
1451 1452 1453 1454 1455 1456 1457

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

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	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1460
	preempted_qc_active = ap->qc_active;
1461
	preempted_nr_active_links = ap->nr_active_links;
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	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1464
	ap->qc_active = 0;
1465
	ap->nr_active_links = 0;
1466 1467

	/* prepare & issue qc */
1468
	qc->tf = *tf;
1469 1470
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1471
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1472 1473
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1474 1475 1476 1477 1478 1479
		unsigned int i, buflen = 0;

		for (i = 0; i < n_elem; i++)
			buflen += sg[i].length;

		ata_sg_init(qc, sg, n_elem);
1480
		qc->nbytes = buflen;
1481 1482
	}

1483
	qc->private_data = &wait;
1484 1485
	qc->complete_fn = ata_qc_complete_internal;

1486
	ata_qc_issue(qc);
1487

1488
	spin_unlock_irqrestore(ap->lock, flags);
1489

1490 1491 1492 1493
	if (!timeout)
		timeout = ata_probe_timeout * 1000 / HZ;

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1494 1495

	ata_port_flush_task(ap);
1496

1497
	if (!rc) {
1498
		spin_lock_irqsave(ap->lock, flags);
1499 1500 1501

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1502 1503
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1504
		 */
1505
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1506 1507 1508 1509 1510 1511
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1512

1513 1514
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
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					"qc timeout (cmd 0x%x)\n", command);
1516 1517
		}

1518
		spin_unlock_irqrestore(ap->lock, flags);
1519 1520
	}

1521 1522 1523 1524
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
	/* 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;
1535 1536
	}

1537
	/* finish up */
1538
	spin_lock_irqsave(ap->lock, flags);
1539

1540
	*tf = qc->result_tf;
1541 1542 1543
	err_mask = qc->err_mask;

	ata_qc_free(qc);
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1544 1545
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1546
	ap->qc_active = preempted_qc_active;
1547
	ap->nr_active_links = preempted_nr_active_links;
1548

1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
	/* 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.
	 */
1560
	if (ap->flags & ATA_FLAG_DISABLED) {
1561 1562 1563 1564
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1565
	spin_unlock_irqrestore(ap->lock, flags);
1566

1567
	return err_mask;
1568 1569
}

1570
/**
1571
 *	ata_exec_internal - execute libata internal command
1572 1573 1574 1575 1576 1577
 *	@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
1578
 *	@timeout: Timeout in msecs (0 for default)
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
 *
 *	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,
1591 1592
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1593
{
1594 1595
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1596

1597 1598 1599 1600 1601 1602
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1603

1604 1605
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1606 1607
}

1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
/**
 *	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
1621
 */
1622
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1623 1624 1625 1626 1627 1628 1629 1630 1631
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1632
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1633 1634
}

1635 1636 1637 1638 1639 1640 1641
/**
 *	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.
 */
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1643 1644
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
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1645 1646
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
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1647
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1648
		return 0;
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1649 1650 1651 1652 1653
	/* 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))
1654
		return 1;
A
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1655 1656
	return 0;
}
1657

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1658 1659 1660 1661 1662 1663 1664
/**
 *	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.
 */
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1665

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1666 1667
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1668 1669
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
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1670
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1671 1672 1673 1674
		/* 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
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1675 1676
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1677 1678
		}
	}
A
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1679
	return 3 << ATA_SHIFT_PIO;
1680 1681
}

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1682
/**
1683 1684 1685
 *	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)
1686
 *	@flags: ATA_READID_* flags
1687
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1688
 *
1689 1690
 *	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
1691 1692
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1693
 *
1694 1695 1696
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
 *	now we abort if we hit that case. 
 *
L
Linus Torvalds 已提交
1697
 *	LOCKING:
1698 1699 1700 1701
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1702
 */
1703
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1704
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1705
{
T
Tejun Heo 已提交
1706
	struct ata_port *ap = dev->link->ap;
1707
	unsigned int class = *p_class;
1708
	struct ata_taskfile tf;
1709 1710
	unsigned int err_mask = 0;
	const char *reason;
1711
	int may_fallback = 1, tried_spinup = 0;
1712
	int rc;
L
Linus Torvalds 已提交
1713

1714
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1715
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1716

1717 1718
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1719
	ata_tf_init(dev, &tf);
1720

1721 1722
	switch (class) {
	case ATA_DEV_ATA:
1723
		tf.command = ATA_CMD_ID_ATA;
1724 1725
		break;
	case ATA_DEV_ATAPI:
1726
		tf.command = ATA_CMD_ID_ATAPI;
1727 1728 1729 1730 1731
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1732 1733
	}

1734
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744

	/* 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
1745

T
Tejun Heo 已提交
1746
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1747
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1748
	if (err_mask) {
1749
		if (err_mask & AC_ERR_NODEV_HINT) {
1750
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1751
				ap->print_id, dev->devno);
1752 1753 1754
			return -ENOENT;
		}

1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
		/* 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;
		}

1770 1771
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1772 1773 1774
		goto err_out;
	}

1775 1776 1777 1778 1779
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1780
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1781

1782
	/* sanity check */
1783
	rc = -EINVAL;
A
Alan Cox 已提交
1784
	reason = "device reports invalid type";
1785 1786 1787 1788 1789 1790 1791

	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;
1792 1793
	}

1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
	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.
		 */
		ata_tf_init(dev, &tf);
		tf.command = ATA_CMD_SET_FEATURES;
		tf.feature = SETFEATURES_SPINUP;
		tf.protocol = ATA_PROT_NODATA;
		tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1806 1807
		err_mask = ata_exec_internal(dev, &tf, NULL,
					     DMA_NONE, NULL, 0, 0);
1808
		if (err_mask && id[2] != 0x738c) {
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
			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;
	}

1821
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1822 1823 1824
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
1825 1826
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1827 1828
		 * anything else..
		 * Some drives were very specific about that exact sequence.
1829 1830 1831
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
1832 1833
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1834
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1835 1836 1837 1838 1839 1840 1841 1842 1843
			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.
			 */
1844
			flags &= ~ATA_READID_POSTRESET;
1845 1846 1847 1848 1849
			goto retry;
		}
	}

	*p_class = class;
1850

1851 1852 1853
	return 0;

 err_out:
T
Tejun Heo 已提交
1854
	if (ata_msg_warn(ap))
1855
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1856
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1857 1858 1859
	return rc;
}

T
Tejun Heo 已提交
1860
static inline u8 ata_dev_knobble(struct ata_device *dev)
1861
{
T
Tejun Heo 已提交
1862 1863
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1864 1865
}

1866 1867 1868
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
1869
	struct ata_port *ap = dev->link->ap;
1870 1871 1872 1873 1874 1875
	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
1876
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
1877 1878 1879
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1880
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1881
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1882 1883 1884 1885 1886 1887 1888 1889 1890
		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);
}

1891
/**
1892 1893 1894 1895 1896
 *	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.
1897 1898
 *
 *	LOCKING:
1899 1900 1901 1902
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1903
 */
1904
int ata_dev_configure(struct ata_device *dev)
1905
{
T
Tejun Heo 已提交
1906 1907
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
1908
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1909
	const u16 *id = dev->id;
1910
	unsigned int xfer_mask;
1911
	char revbuf[7];		/* XYZ-99\0 */
1912 1913
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1914
	int rc;
1915

1916
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1917 1918
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1919
		return 0;
1920 1921
	}

1922
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1923
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1924

T
Tejun Heo 已提交
1925 1926 1927
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
1928 1929 1930 1931
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1932

T
Tejun Heo 已提交
1933 1934 1935 1936 1937
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

1938
	/* print device capabilities */
1939
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1940 1941 1942
		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",
1943
			       __FUNCTION__,
1944 1945
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1946

1947
	/* initialize to-be-configured parameters */
1948
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1949 1950 1951 1952 1953 1954 1955
	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
1956 1957 1958 1959
	/*
	 * common ATA, ATAPI feature tests
	 */

1960
	/* find max transfer mode; for printk only */
1961
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1962

1963 1964
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1965

1966 1967 1968 1969 1970 1971 1972
	/* 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
1973 1974
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1975 1976
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1977 1978 1979
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1980 1981 1982 1983 1984
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1985
		dev->n_sectors = ata_id_n_sectors(id);
1986

1987 1988 1989
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1990
		if (ata_id_has_lba(id)) {
1991
			const char *lba_desc;
1992
			char ncq_desc[20];
1993

1994 1995
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1996
			if (ata_id_has_lba48(id)) {
1997
				dev->flags |= ATA_DFLAG_LBA48;
1998
				lba_desc = "LBA48";
1999 2000 2001 2002

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2003
			}
2004

2005 2006 2007
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2008
			/* print device info to dmesg */
2009 2010 2011 2012 2013 2014 2015
			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",
2016
					(unsigned long long)dev->n_sectors,
2017 2018
					dev->multi_count, lba_desc, ncq_desc);
			}
2019
		} else {
2020 2021 2022
			/* CHS */

			/* Default translation */
2023 2024 2025
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2026

2027
			if (ata_id_current_chs_valid(id)) {
2028
				/* Current CHS translation is valid. */
2029 2030 2031
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2032 2033 2034
			}

			/* print device info to dmesg */
2035
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2036
				ata_dev_printk(dev, KERN_INFO,
2037 2038 2039
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2040
				ata_dev_printk(dev, KERN_INFO,
2041 2042 2043 2044 2045
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2046 2047
		}

2048
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2049 2050 2051
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2052
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2053 2054
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2055
		u32 sntf;
2056

2057
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2058
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2059
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2060 2061
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2062
			rc = -EINVAL;
L
Linus Torvalds 已提交
2063 2064
			goto err_out_nosup;
		}
2065
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2066

2067 2068 2069 2070
		/* 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.
2071
		 */
2072 2073 2074
		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
2075 2076
			unsigned int err_mask;

2077
			/* issue SET feature command to turn this on */
T
Tejun Heo 已提交
2078 2079
			err_mask = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
			if (err_mask)
2080
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2081 2082 2083
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2084
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2085 2086
				atapi_an_string = ", ATAPI AN";
			}
2087 2088
		}

2089
		if (ata_id_cdb_intr(dev->id)) {
2090
			dev->flags |= ATA_DFLAG_CDB_INTR;
2091 2092
			cdb_intr_string = ", CDB intr";
		}
2093

L
Linus Torvalds 已提交
2094
		/* print device info to dmesg */
2095
		if (ata_msg_drv(ap) && print_info)
2096
			ata_dev_printk(dev, KERN_INFO,
T
Tejun Heo 已提交
2097
				       "ATAPI: %s, %s, max %s%s%s\n",
2098
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2099
				       ata_mode_string(xfer_mask),
T
Tejun Heo 已提交
2100
				       cdb_intr_string, atapi_an_string);
L
Linus Torvalds 已提交
2101 2102
	}

2103 2104 2105 2106 2107
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
	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 */
                if (print_info) {
			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");
		}
	}

2120
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2121
	if (ata_dev_knobble(dev)) {
2122
		if (ata_msg_drv(ap) && print_info)
2123 2124
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2125
		dev->udma_mask &= ATA_UDMA5;
2126 2127 2128
		dev->max_sectors = ATA_MAX_SECTORS;
	}

T
Tejun Heo 已提交
2129
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2130 2131
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2132

2133
	if (ap->ops->dev_config)
2134
		ap->ops->dev_config(dev);
2135

2136 2137 2138
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2139
	return 0;
L
Linus Torvalds 已提交
2140 2141

err_out_nosup:
2142
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2143 2144
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2145
	return rc;
L
Linus Torvalds 已提交
2146 2147
}

A
Alan Cox 已提交
2148
/**
2149
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2150 2151
 *	@ap: port
 *
2152
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2153 2154 2155 2156 2157 2158 2159 2160 2161
 *	detection.
 */

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

/**
2162
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2163 2164
 *	@ap: port
 *
2165
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197
 *	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
2198 2199 2200 2201
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2202 2203 2204 2205
 *	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
2206
 *	LOCKING:
J
Jeff Garzik 已提交
2207
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2208 2209
 *
 *	RETURNS:
2210
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2211 2212
 */

2213
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2214
{
2215
	unsigned int classes[ATA_MAX_DEVICES];
2216
	int tries[ATA_MAX_DEVICES];
2217
	int rc;
2218
	struct ata_device *dev;
L
Linus Torvalds 已提交
2219

2220
	ata_port_probe(ap);
2221

2222 2223
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2224 2225

 retry:
2226
	/* reset and determine device classes */
2227
	ap->ops->phy_reset(ap);
2228

2229
	ata_link_for_each_dev(dev, &ap->link) {
2230 2231 2232 2233 2234
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2235

2236
		dev->class = ATA_DEV_UNKNOWN;
2237
	}
L
Linus Torvalds 已提交
2238

2239
	ata_port_probe(ap);
2240

A
Alan Cox 已提交
2241 2242 2243
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

2244 2245
	ata_link_for_each_dev(dev, &ap->link)
		dev->pio_mode = XFER_PIO_0;
A
Alan Cox 已提交
2246

2247 2248 2249 2250
	/* 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 */

2251 2252 2253
	ata_link_for_each_dev(dev, &ap->link) {
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2254

2255
		if (!ata_dev_enabled(dev))
2256 2257
			continue;

2258 2259
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2260 2261
		if (rc)
			goto fail;
2262 2263
	}

A
Alan Cox 已提交
2264 2265 2266 2267
	/* 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
2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278
	/* 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;
	}

2279 2280 2281
	/* 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 */

2282
	ata_link_for_each_dev(dev, &ap->link) {
2283 2284
		if (!ata_dev_enabled(dev))
			continue;
2285

T
Tejun Heo 已提交
2286
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2287
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2288
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2289 2290
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2291 2292
	}

2293
	/* configure transfer mode */
2294
	rc = ata_set_mode(&ap->link, &dev);
2295
	if (rc)
2296
		goto fail;
L
Linus Torvalds 已提交
2297

2298 2299
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2300
			return 0;
L
Linus Torvalds 已提交
2301

2302 2303
	/* no device present, disable port */
	ata_port_disable(ap);
2304
	return -ENODEV;
2305 2306

 fail:
2307 2308
	tries[dev->devno]--;

2309 2310
	switch (rc) {
	case -EINVAL:
2311
		/* eeek, something went very wrong, give up */
2312 2313
		tries[dev->devno] = 0;
		break;
2314 2315 2316 2317

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2318
	case -EIO:
2319 2320 2321 2322
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2323
			sata_down_spd_limit(&ap->link);
2324 2325
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2326 2327
	}

2328
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2329
		ata_dev_disable(dev);
2330

2331
	goto retry;
L
Linus Torvalds 已提交
2332 2333 2334
}

/**
J
Jeff Garzik 已提交
2335 2336
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2337
 *
J
Jeff Garzik 已提交
2338 2339 2340
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2341
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2342
 *	serialization.
L
Linus Torvalds 已提交
2343 2344 2345 2346
 */

void ata_port_probe(struct ata_port *ap)
{
2347
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2348 2349
}

2350 2351
/**
 *	sata_print_link_status - Print SATA link status
2352
 *	@link: SATA link to printk link status about
2353 2354 2355 2356 2357 2358
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2359
void sata_print_link_status(struct ata_link *link)
2360
{
2361
	u32 sstatus, scontrol, tmp;
2362

2363
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2364
		return;
2365
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2366

2367
	if (ata_link_online(link)) {
2368
		tmp = (sstatus >> 4) & 0xf;
2369
		ata_link_printk(link, KERN_INFO,
2370 2371
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2372
	} else {
2373
		ata_link_printk(link, KERN_INFO,
2374 2375
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2376 2377 2378
	}
}

L
Linus Torvalds 已提交
2379
/**
J
Jeff Garzik 已提交
2380 2381
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2382
 *
J
Jeff Garzik 已提交
2383 2384 2385
 *	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
2386 2387
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2388
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2389 2390 2391 2392
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
2393
	struct ata_link *link = &ap->link;
L
Linus Torvalds 已提交
2394
	unsigned long timeout = jiffies + (HZ * 5);
2395
	u32 sstatus;
L
Linus Torvalds 已提交
2396 2397

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2398
		/* issue phy wake/reset */
2399
		sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2400 2401 2402
		/* 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
2403
	}
2404
	/* phy wake/clear reset */
2405
	sata_scr_write_flush(link, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2406 2407 2408 2409

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2410
		sata_scr_read(link, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2411 2412 2413 2414
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2415
	/* print link status */
2416
	sata_print_link_status(link);
2417

2418
	/* TODO: phy layer with polling, timeouts, etc. */
2419
	if (!ata_link_offline(link))
L
Linus Torvalds 已提交
2420
		ata_port_probe(ap);
2421
	else
L
Linus Torvalds 已提交
2422 2423
		ata_port_disable(ap);

2424
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435
		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
2436 2437
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2438
 *
J
Jeff Garzik 已提交
2439 2440
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2441 2442
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2443
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2444 2445 2446 2447 2448
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2449
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2450 2451 2452 2453
		return;
	ata_bus_reset(ap);
}

2454 2455 2456 2457 2458 2459 2460
/**
 *	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
 */
2461

T
Tejun Heo 已提交
2462
struct ata_device *ata_dev_pair(struct ata_device *adev)
2463
{
T
Tejun Heo 已提交
2464 2465
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2466
	if (!ata_dev_enabled(pair))
2467 2468 2469 2470
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2471
/**
J
Jeff Garzik 已提交
2472 2473
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2474
 *
J
Jeff Garzik 已提交
2475 2476 2477 2478 2479
 *	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
2480
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2481
 *	serialization.
L
Linus Torvalds 已提交
2482 2483 2484 2485
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2486 2487
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2488
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2489 2490
}

2491
/**
2492
 *	sata_down_spd_limit - adjust SATA spd limit downward
2493
 *	@link: Link to adjust SATA spd limit for
2494
 *
2495
 *	Adjust SATA spd limit of @link downward.  Note that this
2496
 *	function only adjusts the limit.  The change must be applied
2497
 *	using sata_set_spd().
2498 2499 2500 2501 2502 2503 2504
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2505
int sata_down_spd_limit(struct ata_link *link)
2506
{
2507 2508
	u32 sstatus, spd, mask;
	int rc, highbit;
2509

2510
	if (!sata_scr_valid(link))
2511 2512 2513
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2514
	 * If not, use cached value in link->sata_spd.
2515
	 */
2516
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2517 2518 2519
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2520
		spd = link->sata_spd;
2521

2522
	mask = link->sata_spd_limit;
2523 2524
	if (mask <= 1)
		return -EINVAL;
2525 2526

	/* unconditionally mask off the highest bit */
2527 2528 2529
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2530 2531 2532 2533 2534 2535 2536 2537 2538
	/* 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? */
2539 2540 2541
	if (!mask)
		return -EINVAL;

2542
	link->sata_spd_limit = mask;
2543

2544
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2545
			sata_spd_string(fls(mask)));
2546 2547 2548 2549

	return 0;
}

2550
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2551 2552 2553
{
	u32 spd, limit;

2554
	if (link->sata_spd_limit == UINT_MAX)
2555 2556
		limit = 0;
	else
2557
		limit = fls(link->sata_spd_limit);
2558 2559 2560 2561 2562 2563 2564 2565

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

	return spd != limit;
}

/**
2566
 *	sata_set_spd_needed - is SATA spd configuration needed
2567
 *	@link: Link in question
2568 2569
 *
 *	Test whether the spd limit in SControl matches
2570
 *	@link->sata_spd_limit.  This function is used to determine
2571 2572 2573 2574 2575 2576 2577 2578 2579
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2580
int sata_set_spd_needed(struct ata_link *link)
2581 2582 2583
{
	u32 scontrol;

2584
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2585 2586
		return 0;

2587
	return __sata_set_spd_needed(link, &scontrol);
2588 2589 2590
}

/**
2591
 *	sata_set_spd - set SATA spd according to spd limit
2592
 *	@link: Link to set SATA spd for
2593
 *
2594
 *	Set SATA spd of @link according to sata_spd_limit.
2595 2596 2597 2598 2599 2600
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2601
 *	changed.  Negative errno if SCR registers are inaccessible.
2602
 */
2603
int sata_set_spd(struct ata_link *link)
2604 2605
{
	u32 scontrol;
2606
	int rc;
2607

2608
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2609
		return rc;
2610

2611
	if (!__sata_set_spd_needed(link, &scontrol))
2612 2613
		return 0;

2614
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2615 2616
		return rc;

2617 2618 2619
	return 1;
}

A
Alan Cox 已提交
2620 2621 2622 2623 2624
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2625
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2626
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2627 2628 2629
 * 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
2630 2631 2632 2633 2634 2635 2636 2637 2638
 */

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 },

2639 2640
	{ 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
2641 2642 2643 2644 2645
	{ 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 }, */
2646

A
Alan Cox 已提交
2647 2648 2649
	{ 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 },
2650

A
Alan Cox 已提交
2651 2652 2653 2654
	{ 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 },

2655 2656
	{ 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
2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701
	{ 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 }
};

#define ENOUGH(v,unit)		(((v)-1)/(unit)+1)
#define EZ(v,unit)		((v)?ENOUGH(v,unit):0)

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);
}

static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
{
	const struct ata_timing *t;

	for (t = ata_timing; t->mode != speed; t++)
A
Alan Cox 已提交
2702
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2703
			return NULL;
2704
	return t;
A
Alan Cox 已提交
2705 2706 2707 2708 2709 2710 2711 2712 2713
}

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;

	/*
2714
	 * Find the mode.
2715
	 */
A
Alan Cox 已提交
2716 2717 2718 2719

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

2720 2721
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
	/*
	 * 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));
		if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
			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];
		} else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
			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.
	 */

2742
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2743 2744

	/*
2745 2746 2747
	 * 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
2748 2749
	 */

2750
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2751 2752 2753 2754 2755
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2756
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767
	 */

	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
2768

2769 2770 2771 2772 2773
	/* 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
2774 2775 2776 2777

	return 0;
}

2778 2779 2780
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2781
 *	@sel: ATA_DNXFER_* selector
2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792
 *
 *	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
 */
2793
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2794
{
2795 2796 2797 2798
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2799

2800 2801
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2802

2803 2804 2805 2806
	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);
2807

2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859
	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);
	}
2860 2861 2862 2863 2864 2865 2866

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

	return 0;
}

T
Tejun Heo 已提交
2867
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2868
{
T
Tejun Heo 已提交
2869
	struct ata_eh_context *ehc = &dev->link->eh_context;
2870 2871
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2872

2873
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2874 2875 2876
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2877
	err_mask = ata_dev_set_xfermode(dev);
2878 2879 2880
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
        	err_mask &= ~AC_ERR_DEV;
A
Alan Cox 已提交
2881 2882 2883 2884 2885
	/* 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;
2886
	if (err_mask) {
2887 2888
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2889 2890
		return -EIO;
	}
L
Linus Torvalds 已提交
2891

2892
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
2893
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
2894
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2895
	if (rc)
2896
		return rc;
2897

2898 2899
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2900

2901 2902
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2903
	return 0;
L
Linus Torvalds 已提交
2904 2905 2906
}

/**
2907
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2908
 *	@link: link on which timings will be programmed
2909
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2910
 *
2911 2912 2913
 *	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
2914
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2915
 *
L
Linus Torvalds 已提交
2916
 *	LOCKING:
J
Jeff Garzik 已提交
2917
 *	PCI/etc. bus probe sem.
2918 2919 2920
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2921
 */
2922

2923
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2924
{
2925
	struct ata_port *ap = link->ap;
2926
	struct ata_device *dev;
2927
	int rc = 0, used_dma = 0, found = 0;
2928

2929
	/* step 1: calculate xfer_mask */
2930
	ata_link_for_each_dev(dev, link) {
2931
		unsigned int pio_mask, dma_mask;
2932
		unsigned int mode_mask;
2933

2934
		if (!ata_dev_enabled(dev))
2935 2936
			continue;

2937 2938 2939 2940 2941 2942
		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
2943
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2944

2945 2946
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2947 2948 2949 2950 2951 2952

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

2953 2954
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2955

2956
		found = 1;
2957 2958
		if (dev->dma_mode)
			used_dma = 1;
2959
	}
2960
	if (!found)
2961
		goto out;
2962 2963

	/* step 2: always set host PIO timings */
2964
	ata_link_for_each_dev(dev, link) {
2965 2966 2967 2968
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2969
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2970
			rc = -EINVAL;
2971
			goto out;
2972 2973 2974 2975 2976 2977 2978
		}

		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
2979

2980
	/* step 3: set host DMA timings */
2981
	ata_link_for_each_dev(dev, link) {
2982 2983 2984 2985 2986 2987 2988 2989
		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
2990 2991

	/* step 4: update devices' xfer mode */
2992
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
2993
		/* don't update suspended devices' xfer mode */
2994
		if (!ata_dev_enabled(dev))
2995 2996
			continue;

T
Tejun Heo 已提交
2997
		rc = ata_dev_set_mode(dev);
2998
		if (rc)
2999
			goto out;
3000
	}
L
Linus Torvalds 已提交
3001

3002 3003
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3004
	 */
J
Jeff Garzik 已提交
3005
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3006
		ap->host->simplex_claimed = ap;
3007

3008 3009 3010 3011
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3012 3013
}

3014 3015
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
3016
 *	@link: link on which timings will be programmed
3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028
 *	@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
 */
3029
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3030
{
3031 3032
	struct ata_port *ap = link->ap;

3033 3034
	/* has private set_mode? */
	if (ap->ops->set_mode)
3035 3036
		return ap->ops->set_mode(link, r_failed_dev);
	return ata_do_set_mode(link, r_failed_dev);
3037 3038
}

3039 3040 3041 3042 3043 3044 3045 3046 3047 3048
/**
 *	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
3049
 *	spin_lock_irqsave(host lock)
3050 3051 3052 3053 3054 3055 3056 3057 3058
 */

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
3059 3060 3061 3062 3063 3064
/**
 *	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
3065 3066 3067
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
3068 3069 3070 3071 3072
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
3073
 */
3074 3075
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
3076 3077 3078 3079 3080 3081 3082
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
3083 3084
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3085 3086 3087 3088
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

3089
	if (status != 0xff && (status & ATA_BUSY))
3090
		ata_port_printk(ap, KERN_WARNING,
3091 3092
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
3093 3094

	timeout = timer_start + tmout;
3095 3096
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3097 3098 3099 3100
		msleep(50);
		status = ata_chk_status(ap);
	}

3101 3102 3103
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
3104
	if (status & ATA_BUSY) {
3105
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
3106 3107
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
3108
		return -EBUSY;
L
Linus Torvalds 已提交
3109 3110 3111 3112 3113
	}

	return 0;
}

3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
/**
 *	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;
3139
		if (!ata_link_online(&ap->link) && status == 0xff)
3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157
			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
3158 3159 3160 3161
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3162
	int rc, ret = 0;
L
Linus Torvalds 已提交
3163 3164 3165 3166

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3167 3168
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3169 3170 3171 3172 3173
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3174
	}
L
Linus Torvalds 已提交
3175

3176 3177
	/* 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
3178
	 */
3179 3180
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3181 3182

		ap->ops->dev_select(ap, 1);
3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197

		/* 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 */
		}

3198
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3199 3200 3201 3202 3203
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3204
	}
L
Linus Torvalds 已提交
3205 3206 3207 3208 3209 3210 3211

	/* 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);
3212

T
Tejun Heo 已提交
3213
	return ret;
L
Linus Torvalds 已提交
3214 3215
}

3216 3217
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3218 3219
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
3220 3221
	struct ata_device *dev;
	int i = 0;
L
Linus Torvalds 已提交
3222

T
Tejun Heo 已提交
3223
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3224 3225

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3226 3227 3228 3229 3230
	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
3231

3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250
	/* If we issued an SRST then an ATA drive (not ATAPI)
	 * may have changed configuration and be in PIO0 timing. If
	 * we did 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.
	 */

	ata_link_for_each_dev(dev, &ap->link)
		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 revalidating */
	if (ap->ops->set_piomode) {
		ata_link_for_each_dev(dev, &ap->link)
			if (devmask & (1 << i++))
				ap->ops->set_piomode(ap, dev);
	}

L
Linus Torvalds 已提交
3251 3252 3253 3254 3255 3256 3257
	/* 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.
3258 3259
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3260 3261 3262
	 */
	msleep(150);

3263
	/* Before we perform post reset processing we want to see if
3264 3265 3266
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3267
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3268
		return -ENODEV;
3269

3270
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285
}

/**
 *	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
3286
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3287
 *	Obtains host lock.
L
Linus Torvalds 已提交
3288 3289
 *
 *	SIDE EFFECTS:
3290
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3291 3292 3293 3294
 */

void ata_bus_reset(struct ata_port *ap)
{
T
Tejun Heo 已提交
3295
	struct ata_device *device = ap->link.device;
L
Linus Torvalds 已提交
3296 3297 3298
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3299
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3300
	int rc;
L
Linus Torvalds 已提交
3301

T
Tejun Heo 已提交
3302
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321

	/* 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
3322 3323 3324
	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
3325
			goto err_out;
T
Tejun Heo 已提交
3326
	}
L
Linus Torvalds 已提交
3327 3328 3329 3330

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3331
	device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
L
Linus Torvalds 已提交
3332
	if ((slave_possible) && (err != 0x81))
3333
		device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
L
Linus Torvalds 已提交
3334 3335

	/* is double-select really necessary? */
T
Tejun Heo 已提交
3336
	if (device[1].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3337
		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3338
	if (device[0].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3339 3340 3341
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
T
Tejun Heo 已提交
3342 3343
	if ((device[0].class == ATA_DEV_NONE) &&
	    (device[1].class == ATA_DEV_NONE))
L
Linus Torvalds 已提交
3344 3345 3346 3347
		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
3348
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3349 3350 3351 3352 3353 3354
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3355
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
3356
	ata_port_disable(ap);
L
Linus Torvalds 已提交
3357 3358 3359 3360

	DPRINTK("EXIT\n");
}

3361
/**
3362 3363
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3364
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3365
 *	@deadline: deadline jiffies for the operation
3366
 *
3367
*	Make sure SStatus of @link reaches stable state, determined by
3368 3369
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3370 3371
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3372 3373
 *	until timeout then returns 0 if DET is stable at 1.
 *
3374 3375 3376
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3377 3378 3379 3380 3381 3382
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3383 3384
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3385
{
3386
	unsigned long interval_msec = params[0];
3387 3388
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3389 3390 3391
	u32 last, cur;
	int rc;

3392 3393 3394 3395
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3396
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3397 3398 3399 3400 3401 3402 3403 3404
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3405
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3406 3407 3408 3409 3410
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3411
			if (cur == 1 && time_before(jiffies, deadline))
3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3422 3423 3424
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3425
		if (time_after(jiffies, deadline))
3426
			return -EPIPE;
3427 3428 3429 3430
	}
}

/**
3431 3432
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3433
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3434
 *	@deadline: deadline jiffies for the operation
3435
 *
3436
 *	Resume SATA phy @link and debounce it.
3437 3438 3439 3440 3441 3442 3443
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3444 3445
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3446 3447
{
	u32 scontrol;
3448 3449
	int rc;

3450
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3451
		return rc;
3452

3453
	scontrol = (scontrol & 0x0f0) | 0x300;
3454

3455
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3456
		return rc;
3457

3458 3459 3460 3461
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3462

3463
	return sata_link_debounce(link, params, deadline);
3464 3465
}

3466 3467
/**
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3468
 *	@link: ATA link to be reset
3469
 *	@deadline: deadline jiffies for the operation
3470
 *
T
Tejun Heo 已提交
3471
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3472 3473 3474 3475
 *	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.
3476 3477 3478 3479 3480 3481 3482
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3483
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3484
{
T
Tejun Heo 已提交
3485
	struct ata_port *ap = link->ap;
3486
	struct ata_eh_context *ehc = &link->eh_context;
3487
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3488 3489
	int rc;

T
Tejun Heo 已提交
3490
	/* handle link resume */
3491
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3492
	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3493 3494
		ehc->i.action |= ATA_EH_HARDRESET;

3495 3496 3497 3498 3499 3500
	/* 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;

3501 3502 3503 3504
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3505
	/* if SATA, resume link */
3506
	if (ap->flags & ATA_FLAG_SATA) {
3507
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3508 3509
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3510
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3511 3512 3513 3514 3515 3516
					"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.
	 */
3517
	if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
T
Tejun Heo 已提交
3518
		rc = ata_wait_ready(ap, deadline);
3519
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3520
			ata_link_printk(link, KERN_WARNING, "device not ready "
T
Tejun Heo 已提交
3521 3522 3523 3524
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3525 3526 3527 3528

	return 0;
}

3529 3530
/**
 *	ata_std_softreset - reset host port via ATA SRST
T
Tejun Heo 已提交
3531
 *	@link: ATA link to reset
3532
 *	@classes: resulting classes of attached devices
3533
 *	@deadline: deadline jiffies for the operation
3534
 *
3535
 *	Reset host port using ATA SRST.
3536 3537 3538 3539 3540 3541 3542
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3543
int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3544
		      unsigned long deadline)
3545
{
T
Tejun Heo 已提交
3546
	struct ata_port *ap = link->ap;
3547
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3548 3549
	unsigned int devmask = 0;
	int rc;
3550 3551 3552 3553
	u8 err;

	DPRINTK("ENTER\n");

3554
	if (ata_link_offline(link)) {
3555 3556 3557 3558
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569
	/* 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);
3570
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3571
	/* if link is occupied, -ENODEV too is an error */
3572
	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
T
Tejun Heo 已提交
3573
		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3574
		return rc;
3575 3576 3577
	}

	/* determine by signature whether we have ATA or ATAPI devices */
3578 3579
	classes[0] = ata_dev_try_classify(&link->device[0],
					  devmask & (1 << 0), &err);
3580
	if (slave_possible && err != 0x81)
3581 3582
		classes[1] = ata_dev_try_classify(&link->device[1],
						  devmask & (1 << 1), &err);
3583

3584
 out:
3585 3586 3587 3588 3589
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
T
Tejun Heo 已提交
3590 3591
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
3592
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3593
 *	@deadline: deadline jiffies for the operation
3594
 *
T
Tejun Heo 已提交
3595
 *	SATA phy-reset @link using DET bits of SControl register.
3596 3597 3598 3599 3600 3601 3602
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3603
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3604
			unsigned long deadline)
3605
{
3606
	u32 scontrol;
3607
	int rc;
3608

3609 3610
	DPRINTK("ENTER\n");

3611
	if (sata_set_spd_needed(link)) {
3612 3613 3614 3615 3616
		/* 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.
		 */
3617
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3618
			goto out;
3619

3620
		scontrol = (scontrol & 0x0f0) | 0x304;
3621

3622
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3623
			goto out;
3624

3625
		sata_set_spd(link);
3626 3627 3628
	}

	/* issue phy wake/reset */
3629
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3630
		goto out;
3631

3632
	scontrol = (scontrol & 0x0f0) | 0x301;
3633

3634
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3635
		goto out;
3636

3637
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3638 3639 3640 3641
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3642 3643
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3644 3645 3646 3647 3648 3649 3650
 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
3651
 *	@link: link to reset
3652
 *	@class: resulting class of attached device
3653
 *	@deadline: deadline jiffies for the operation
3654 3655 3656 3657 3658 3659 3660 3661 3662 3663
 *
 *	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
3664
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3665
		       unsigned long deadline)
3666
{
T
Tejun Heo 已提交
3667
	struct ata_port *ap = link->ap;
3668
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3669 3670 3671 3672 3673
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
T
Tejun Heo 已提交
3674
	rc = sata_link_hardreset(link, timing, deadline);
3675
	if (rc) {
T
Tejun Heo 已提交
3676
		ata_link_printk(link, KERN_ERR,
3677 3678 3679
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3680 3681

	/* TODO: phy layer with polling, timeouts, etc. */
3682
	if (ata_link_offline(link)) {
3683 3684 3685 3686 3687
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3688 3689 3690
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3691 3692 3693 3694 3695 3696 3697 3698 3699 3700
	/* 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;
	}

3701
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3702 3703
	/* link occupied, -ENODEV too is an error */
	if (rc) {
T
Tejun Heo 已提交
3704
		ata_link_printk(link, KERN_ERR,
3705 3706
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3707 3708
	}

3709 3710
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3711
	*class = ata_dev_try_classify(link->device, 1, NULL);
3712 3713 3714 3715 3716 3717 3718

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

/**
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3719
 *	@link: the target ata_link
3720 3721 3722 3723 3724 3725 3726 3727 3728
 *	@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
3729
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3730
{
T
Tejun Heo 已提交
3731
	struct ata_port *ap = link->ap;
3732 3733
	u32 serror;

3734 3735 3736
	DPRINTK("ENTER\n");

	/* print link status */
3737
	sata_print_link_status(link);
3738

3739
	/* clear SError */
3740 3741
	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
		sata_scr_write(link, SCR_ERROR, serror);
3742

3743 3744 3745 3746 3747 3748
	/* 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);

3749 3750 3751 3752 3753 3754 3755
	/* 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
3756 3757
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3758 3759 3760 3761

	DPRINTK("EXIT\n");
}

3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777
/**
 *	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
3778 3779
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3780 3781
{
	const u16 *old_id = dev->id;
3782 3783
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3784 3785

	if (dev->class != new_class) {
3786 3787
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3788 3789 3790
		return 0;
	}

3791 3792 3793 3794
	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]));
3795 3796

	if (strcmp(model[0], model[1])) {
3797 3798
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3799 3800 3801 3802
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3803 3804
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3805 3806 3807 3808 3809 3810 3811
		return 0;
	}

	return 1;
}

/**
3812
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3813
 *	@dev: target ATA device
3814
 *	@readid_flags: read ID flags
3815 3816 3817 3818 3819 3820 3821 3822 3823 3824
 *
 *	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
 */
3825
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3826
{
3827
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3828
	u16 *id = (void *)dev->link->ap->sector_buf;
3829 3830
	int rc;

3831
	/* read ID data */
3832
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3833
	if (rc)
3834
		return rc;
3835 3836

	/* is the device still there? */
3837 3838
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3839

3840
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3841 3842 3843 3844 3845 3846
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3847
 *	@new_class: new class code
3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858
 *	@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
 */
3859 3860
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3861
{
3862
	u64 n_sectors = dev->n_sectors;
3863 3864 3865 3866 3867
	int rc;

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

3868 3869 3870 3871 3872 3873 3874 3875 3876
	/* 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;
	}

3877 3878 3879 3880
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3881 3882

	/* configure device according to the new ID */
3883
	rc = ata_dev_configure(dev);
3884 3885 3886 3887
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
3888 3889
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
3890 3891 3892 3893
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
3894 3895 3896 3897

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

3898 3899 3900 3901 3902
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3903 3904

 fail:
3905
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3906 3907 3908
	return rc;
}

3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945
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 },
	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },
3946
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3947
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3948 3949
	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
				NULL,		ATA_HORKAGE_NODMA },
3950 3951 3952
	/* Odd clown on sil3726/4726 PMPs */
	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
						ATA_HORKAGE_SKIP_PM },
3953

3954
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3955
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3956

3957 3958 3959 3960 3961
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3962 3963
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3964
	/* NCQ is broken */
3965
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3966
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
3967 3968
	{ "HITACHI HDS7250SASUN500G*", NULL,    ATA_HORKAGE_NONCQ },
	{ "HITACHI HDS7225SBSUN250G*", NULL,    ATA_HORKAGE_NONCQ },
3969
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
3970

3971 3972 3973 3974 3975
	/* 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, },
3976 3977
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3978
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3979
	{ "HDT722516DLA380",	"V43OA96A",	ATA_HORKAGE_NONCQ, },
3980
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3981
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3982
	{ "WDC WD3200AAJS-00RYA0", "12.01B01",	ATA_HORKAGE_NONCQ, },
3983
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
3984
	{ "ST9120822AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3985
	{ "ST9160821AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3986
	{ "ST9160821AS",	"3.ALD",	ATA_HORKAGE_NONCQ, },
3987
	{ "ST9160821AS",	"3.CCD",	ATA_HORKAGE_NONCQ, },
3988 3989
	{ "ST3160812AS",	"3.ADJ",	ATA_HORKAGE_NONCQ, },
	{ "ST980813AS",		"3.ADB",	ATA_HORKAGE_NONCQ, },
3990
	{ "SAMSUNG HD401LJ",	"ZZ100-15",	ATA_HORKAGE_NONCQ, },
3991

3992 3993 3994 3995 3996
	/* 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 },
3997

3998 3999 4000 4001
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },

4002 4003
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4004
};
4005

4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022
int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
	else
		len = strlen(name);

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4023
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4024
{
T
Tejun Heo 已提交
4025 4026
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4027
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4028

T
Tejun Heo 已提交
4029 4030
	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
4031

4032
	while (ad->model_num) {
4033
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4034 4035
			if (ad->model_rev == NULL)
				return ad->horkage;
4036
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4037
				return ad->horkage;
4038
		}
4039
		ad++;
4040
	}
L
Linus Torvalds 已提交
4041 4042 4043
	return 0;
}

4044 4045 4046 4047 4048 4049
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
4050
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4051 4052
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4053
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4054 4055
}

4056 4057 4058 4059
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4060 4061 4062 4063
 *	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...
4064 4065 4066 4067
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4068
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4069
{
T
Tejun Heo 已提交
4070 4071
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4072
	struct ata_host *host = ap->host;
4073
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4074

4075
	/* controller modes available */
4076 4077 4078
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4079
	/* drive modes available */
4080 4081 4082
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4083

4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094
	/*
	 *	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));
	}

4095 4096
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4097 4098
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4099
	}
4100

4101 4102
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
4103 4104 4105
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4106
	}
4107

J
Jeff Garzik 已提交
4108 4109 4110
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4111
	if (ap->ops->mode_filter)
4112
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4113

4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132
	/* 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 */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4133 4134
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4135 4136 4137 4138 4139 4140
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4141 4142 4143
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4144
 *	LOCKING:
J
Jeff Garzik 已提交
4145
 *	PCI/etc. bus probe sem.
4146 4147 4148
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4149 4150
 */

T
Tejun Heo 已提交
4151
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4152
{
4153
	struct ata_taskfile tf;
4154
	unsigned int err_mask;
L
Linus Torvalds 已提交
4155 4156 4157 4158

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

T
Tejun Heo 已提交
4159 4160 4161
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4162
	ata_tf_init(dev, &tf);
4163 4164
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4165
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4166 4167
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
4168

4169
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}

/**
 *	ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
 *	on port @ap with sector count set to indicate Asynchronous
 *	Notification feature
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable)
{
	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;
	tf.nsect = SATA_AN;

4205
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4206

4207 4208
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4209 4210
}

4211 4212 4213
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4214 4215
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4216 4217
 *
 *	LOCKING:
4218 4219 4220 4221
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4222
 */
T
Tejun Heo 已提交
4223 4224
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4225
{
4226
	struct ata_taskfile tf;
4227
	unsigned int err_mask;
4228 4229 4230

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4231
		return AC_ERR_INVALID;
4232 4233 4234 4235

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

T
Tejun Heo 已提交
4236
	ata_tf_init(dev, &tf);
4237 4238 4239 4240 4241
	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 */
4242

4243
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4244 4245 4246 4247 4248
	/* 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;
4249

4250 4251
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4252 4253
}

L
Linus Torvalds 已提交
4254
/**
J
Jeff Garzik 已提交
4255 4256 4257 4258
 *	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
4259 4260
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4261
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4262
 */
4263
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4264 4265
{
	struct ata_port *ap = qc->ap;
4266
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4267
	int dir = qc->dma_dir;
4268
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4269

4270 4271
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4272 4273

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4274
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4275

J
Jeff Garzik 已提交
4276
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4277

4278 4279 4280 4281 4282 4283 4284 4285
	/* 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) {
4286
		if (qc->n_elem)
4287
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4288 4289 4290 4291 4292 4293
		/* restore last sg */
		sg[qc->orig_n_elem - 1].length += qc->pad_len;
		if (pad_buf) {
			struct scatterlist *psg = &qc->pad_sgent;
			void *addr = kmap_atomic(psg->page, KM_IRQ0);
			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
4294
			kunmap_atomic(addr, KM_IRQ0);
4295 4296
		}
	} else {
4297
		if (qc->n_elem)
4298
			dma_unmap_single(ap->dev,
4299 4300
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4301 4302 4303 4304 4305 4306
		/* 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
4307 4308

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4309
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4310 4311 4312 4313 4314 4315
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4316 4317 4318
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4319
 *	LOCKING:
J
Jeff Garzik 已提交
4320
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4321 4322 4323 4324 4325
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4326 4327
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4328

4329
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4330
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4331 4332

	idx = 0;
4333
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362
		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);
}
4363

4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425
/**
 *	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;

 		/* 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;

			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
4426 4427 4428 4429
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4430 4431 4432 4433
 *	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
4434
 *	LOCKING:
J
Jeff Garzik 已提交
4435
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4436
 *
L
Linus Torvalds 已提交
4437 4438 4439 4440 4441 4442
 *	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;
4443 4444 4445 4446 4447 4448

	/* 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;
4449

L
Linus Torvalds 已提交
4450
	if (ap->ops->check_atapi_dma)
4451
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4452

4453
	return 0;
L
Linus Torvalds 已提交
4454
}
4455

4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485
/**
 *	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
4486 4487 4488 4489
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4490 4491
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4492
 *	LOCKING:
J
Jeff Garzik 已提交
4493
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4494 4495 4496 4497 4498 4499 4500 4501 4502
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519
/**
 *	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);
}

4520 4521
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4522 4523 4524 4525 4526 4527 4528 4529 4530 4531
/**
 *	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
4532
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4533 4534
 */

L
Linus Torvalds 已提交
4535 4536 4537 4538
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4539
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4540
	qc->n_elem = 1;
4541
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4542
	qc->buf_virt = buf;
4543
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4544

4545
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4546 4547
}

J
Jeff Garzik 已提交
4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558
/**
 *	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
4559
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4560 4561
 */

L
Linus Torvalds 已提交
4562 4563 4564 4565
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4566
	qc->__sg = sg;
L
Linus Torvalds 已提交
4567
	qc->n_elem = n_elem;
4568
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4569 4570 4571
}

/**
J
Jeff Garzik 已提交
4572 4573 4574 4575
 *	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
4576 4577
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4578
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4579 4580
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4581
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4582 4583 4584 4585 4586 4587
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4588
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4589
	dma_addr_t dma_address;
4590
	int trim_sg = 0;
L
Linus Torvalds 已提交
4591

4592 4593 4594 4595 4596 4597
	/* 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;

4598
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609

		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;
4610 4611
		if (sg->length == 0)
			trim_sg = 1;
4612 4613 4614 4615 4616

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

4617 4618
	if (trim_sg) {
		qc->n_elem--;
4619 4620 4621
		goto skip_map;
	}

4622
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4623
				     sg->length, dir);
4624 4625 4626
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4627
		return -1;
4628
	}
L
Linus Torvalds 已提交
4629 4630

	sg_dma_address(sg) = dma_address;
4631
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4632

4633
skip_map:
L
Linus Torvalds 已提交
4634 4635 4636 4637 4638 4639 4640
	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
4641 4642 4643 4644
 *	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
4645 4646
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4647
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4648 4649
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4650
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4651 4652 4653 4654 4655 4656
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4657 4658
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4659
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4660

T
Tejun Heo 已提交
4661
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4662
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4663

4664 4665 4666 4667 4668 4669 4670
	/* 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;

4671
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685

		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;
		psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
		psg->offset = offset_in_page(offset);

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			void *addr = kmap_atomic(psg->page, KM_IRQ0);
			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
4686
			kunmap_atomic(addr, KM_IRQ0);
4687 4688 4689 4690 4691 4692
		}

		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;
4693 4694
		if (lsg->length == 0)
			trim_sg = 1;
4695 4696 4697 4698 4699

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

4700 4701 4702 4703 4704 4705 4706 4707 4708
	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
4709
	dir = qc->dma_dir;
4710
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4711 4712 4713
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4714
		return -1;
4715
	}
L
Linus Torvalds 已提交
4716 4717 4718

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

4719
skip_map:
L
Linus Torvalds 已提交
4720 4721 4722 4723 4724
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4725
/**
4726
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4727 4728 4729 4730 4731 4732 4733 4734
 *	@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
4735
 *	Inherited from caller.
E
Edward Falk 已提交
4736
 */
L
Linus Torvalds 已提交
4737 4738 4739 4740 4741 4742 4743 4744 4745 4746
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
4747
/**
T
Tejun Heo 已提交
4748
 *	ata_data_xfer - Transfer data by PIO
4749
 *	@adev: device to target
A
Albert Lee 已提交
4750 4751
 *	@buf: data buffer
 *	@buflen: buffer length
4752
 *	@write_data: read/write
A
Albert Lee 已提交
4753 4754 4755 4756 4757 4758
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4759 4760
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4761
{
T
Tejun Heo 已提交
4762
	struct ata_port *ap = adev->link->ap;
A
Albert Lee 已提交
4763
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4764

A
Albert Lee 已提交
4765
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4766
	if (write_data)
T
Tejun Heo 已提交
4767
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4768
	else
T
Tejun Heo 已提交
4769
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4770 4771 4772 4773 4774 4775 4776 4777

	/* 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
4778
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4779
		} else {
T
Tejun Heo 已提交
4780
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4781 4782 4783
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4784 4785
}

4786
/**
T
Tejun Heo 已提交
4787
 *	ata_data_xfer_noirq - Transfer data by PIO
4788 4789 4790 4791 4792
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4793
 *	Transfer data from/to the device data register by PIO. Do the
4794 4795 4796 4797 4798
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4799 4800
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4801 4802 4803
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4804
	ata_data_xfer(adev, buf, buflen, write_data);
4805 4806 4807 4808
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4809
/**
4810
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4811 4812
 *	@qc: Command on going
 *
4813
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4814 4815 4816 4817 4818
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4819 4820 4821
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4822
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4823 4824 4825 4826 4827
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4828
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4829
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4830 4831

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4832
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4833 4834 4835 4836 4837 4838 4839

	/* 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");

4840 4841 4842
	if (PageHighMem(page)) {
		unsigned long flags;

4843
		/* FIXME: use a bounce buffer */
4844 4845
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4846

4847
		/* do the actual data transfer */
4848
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4849

4850 4851 4852 4853
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4854
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4855
	}
L
Linus Torvalds 已提交
4856

4857 4858
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4859

T
Tejun Heo 已提交
4860
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4861 4862 4863 4864 4865
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4866
/**
4867
 *	ata_pio_sectors - Transfer one or many sectors.
4868 4869
 *	@qc: Command on going
 *
4870
 *	Transfer one or many sectors of data from/to the
4871 4872 4873 4874 4875
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4876

4877 4878 4879 4880 4881 4882
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
4883
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4884

4885
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4886
			    qc->dev->multi_count);
4887 4888 4889 4890
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
4891 4892

	ata_altstatus(qc->ap); /* flush */
4893 4894
}

4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910
/**
 *	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");
4911
	WARN_ON(qc->dev->cdb_len < 12);
4912

4913
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928
	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
4929 4930
}

A
Albert Lee 已提交
4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942
/**
 *	__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
4943 4944 4945
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4946
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4947 4948 4949 4950 4951
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4952
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4953
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4954 4955

next_sg:
4956
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4957
		/*
4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968
		 * 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 */
4969 4970
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4971 4972

		for (i = 0; i < words; i++)
4973
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4974

A
Albert Lee 已提交
4975
		ap->hsm_task_state = HSM_ST_LAST;
4976 4977 4978
		return;
	}

4979
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4980 4981 4982 4983 4984 4985 4986 4987

	page = sg->page;
	offset = sg->offset + qc->cursg_ofs;

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

4988
	/* don't overrun current sg */
4989
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4990 4991 4992 4993

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

4994 4995
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4996 4997 4998
	if (PageHighMem(page)) {
		unsigned long flags;

4999
		/* FIXME: use bounce buffer */
5000 5001
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
5002

5003
		/* do the actual data transfer */
5004
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5005

5006 5007 5008 5009
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
5010
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5011
	}
L
Linus Torvalds 已提交
5012 5013 5014 5015 5016

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

5017
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
5018 5019 5020 5021
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

5022
	if (bytes)
L
Linus Torvalds 已提交
5023 5024 5025
		goto next_sg;
}

A
Albert Lee 已提交
5026 5027 5028 5029 5030 5031 5032 5033 5034 5035
/**
 *	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
5036 5037 5038 5039 5040 5041 5042
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;

5043 5044 5045 5046 5047 5048 5049 5050 5051 5052
	/* 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
5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063
	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
5064
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5065

L
Linus Torvalds 已提交
5066
	__atapi_pio_bytes(qc, bytes);
5067
	ata_altstatus(ap); /* flush */
L
Linus Torvalds 已提交
5068 5069 5070 5071

	return;

err_out:
5072
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5073
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
5074
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
5075 5076 5077
}

/**
5078 5079 5080
 *	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
5081
 *
5082 5083
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
5084
 */
5085 5086

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5087
{
5088 5089
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
5090

5091 5092 5093 5094
	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
5095

5096 5097 5098
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
5099 5100
	}

5101 5102
	return 0;
}
L
Linus Torvalds 已提交
5103

T
Tejun Heo 已提交
5104 5105 5106 5107 5108 5109 5110 5111
/**
 *	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
5112
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
5113 5114 5115 5116 5117 5118 5119 5120 5121
 *	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) {
5122
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
5123

J
Jeff Garzik 已提交
5124 5125
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
5126 5127 5128 5129
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5130
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5131 5132 5133 5134 5135
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

5136
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5137 5138 5139 5140 5141 5142 5143 5144
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
5145
			spin_lock_irqsave(ap->lock, flags);
5146
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5147
			ata_qc_complete(qc);
5148
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5149 5150 5151 5152 5153
		} else
			ata_qc_complete(qc);
	}
}

5154 5155 5156 5157 5158 5159 5160 5161 5162 5163
/**
 *	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.
 */
5164 5165
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
5166
{
5167 5168 5169
	unsigned long flags = 0;
	int poll_next;

5170 5171
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

5172 5173 5174 5175
	/* 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).
	 */
5176
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5177

5178
fsm_start:
5179
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
5180
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5181

5182 5183
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5184 5185 5186 5187 5188 5189 5190 5191
		/* 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);

5192
		/* check device status */
5193 5194 5195 5196 5197 5198 5199 5200 5201
		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
5202
			ap->hsm_task_state = HSM_ST_ERR;
5203
			goto fsm_start;
L
Linus Torvalds 已提交
5204 5205
		}

5206 5207
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
5208 5209 5210
		 * 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.
5211 5212
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5213 5214
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
5215
			qc->err_mask |= AC_ERR_HSM;
5216 5217
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
5218
		}
L
Linus Torvalds 已提交
5219

5220 5221 5222 5223 5224 5225
		/* 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)
5226
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
5227

5228 5229 5230 5231
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
5232

5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243
			/* 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)
5244
			spin_unlock_irqrestore(ap->lock, flags);
5245 5246 5247 5248

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
5249
		break;
5250

5251 5252 5253 5254 5255
	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) {
5256 5257 5258
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
5259 5260 5261
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5262

5263 5264
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
5265 5266 5267
			 * 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.
5268 5269
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5270 5271 5272
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
5273
				qc->err_mask |= AC_ERR_HSM;
5274 5275
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5276
			}
L
Linus Torvalds 已提交
5277

5278
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
5279

5280 5281 5282
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
5283

5284 5285 5286 5287
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
5288 5289 5290 5291
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
5292 5293 5294 5295 5296 5297
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
5298

5299 5300 5301
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5302

5303 5304 5305 5306 5307 5308 5309 5310 5311
			/* 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.
5312 5313 5314 5315
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5316 5317 5318 5319 5320 5321

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

5322 5323 5324
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5325 5326 5327 5328 5329 5330
				/* 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;
5331 5332
			}

5333 5334 5335 5336 5337
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
5338
				status = ata_wait_idle(ap);
5339 5340 5341 5342
				goto fsm_start;
			}
		}

5343
		poll_next = 1;
L
Linus Torvalds 已提交
5344 5345
		break;

A
Albert Lee 已提交
5346
	case HSM_ST_LAST:
5347 5348
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5349 5350 5351 5352 5353
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5354
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5355
			ap->print_id, qc->dev->devno, status);
5356

5357 5358
		WARN_ON(qc->err_mask);

5359
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5360

5361
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5362
		ata_hsm_qc_complete(qc, in_wq);
5363 5364

		poll_next = 0;
L
Linus Torvalds 已提交
5365 5366
		break;

A
Albert Lee 已提交
5367
	case HSM_ST_ERR:
5368 5369 5370 5371 5372 5373
		/* 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;
5374

5375
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5376
		ata_hsm_qc_complete(qc, in_wq);
5377 5378

		poll_next = 0;
5379 5380
		break;
	default:
5381
		poll_next = 0;
5382
		BUG();
L
Linus Torvalds 已提交
5383 5384
	}

5385
	return poll_next;
L
Linus Torvalds 已提交
5386 5387
}

5388
static void ata_pio_task(struct work_struct *work)
5389
{
5390 5391 5392
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5393
	u8 status;
5394
	int poll_next;
5395

J
Jeff Garzik 已提交
5396
fsm_start:
5397
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5398

5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410
	/*
	 * 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) {
5411
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5412 5413
			return;
		}
5414 5415
	}

5416 5417
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5418

5419 5420 5421 5422
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5423
		goto fsm_start;
5424 5425
}

L
Linus Torvalds 已提交
5426 5427 5428 5429 5430 5431
/**
 *	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
5432
 *	None.
L
Linus Torvalds 已提交
5433 5434 5435 5436 5437 5438 5439
 */

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

5440
	/* no command while frozen */
5441
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5442 5443
		return NULL;

5444 5445
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5446
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5447
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461
			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
5462
 *	None.
L
Linus Torvalds 已提交
5463 5464
 */

T
Tejun Heo 已提交
5465
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5466
{
T
Tejun Heo 已提交
5467
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
5468 5469 5470 5471 5472 5473 5474 5475
	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
5476
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489
	}

	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
5490
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5491 5492 5493
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5494 5495 5496
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5497
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5498

5499 5500 5501 5502
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5503
		clear_bit(tag, &ap->qc_allocated);
5504
	}
L
Linus Torvalds 已提交
5505 5506
}

5507
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5508
{
5509
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5510
	struct ata_link *link = qc->dev->link;
5511

5512 5513
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5514 5515 5516 5517

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

5518
	/* command should be marked inactive atomically with qc completion */
5519
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5520
		link->sactive &= ~(1 << qc->tag);
5521 5522 5523
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
5524
		link->active_tag = ATA_TAG_POISON;
5525 5526 5527 5528 5529 5530 5531
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
5532

5533 5534 5535 5536 5537
	/* 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;
5538
	ap->qc_active &= ~(1 << qc->tag);
5539

L
Linus Torvalds 已提交
5540
	/* call completion callback */
5541
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5542 5543
}

5544 5545 5546 5547 5548
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5549
	ap->ops->tf_read(ap, &qc->result_tf);
5550 5551
}

5552 5553 5554 5555 5556 5557 5558 5559 5560
/**
 *	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
5561
 *	spin_lock_irqsave(host lock)
5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580
 */
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) {
5581
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5582 5583 5584 5585 5586 5587 5588

		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 */
5589
				fill_result_tf(qc);
5590 5591 5592 5593 5594 5595 5596
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5597
			fill_result_tf(qc);
5598 5599 5600 5601 5602 5603 5604 5605

		__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)
5606
			fill_result_tf(qc);
5607 5608 5609 5610 5611

		__ata_qc_complete(qc);
	}
}

5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623
/**
 *	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
5624
 *	spin_lock_irqsave(host lock)
5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660
 *
 *	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
5661 5662 5663 5664 5665
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5666
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694
	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
5695
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5696
 */
5697
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5698 5699
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5700
	struct ata_link *link = qc->dev->link;
L
Linus Torvalds 已提交
5701

5702 5703 5704 5705
	/* 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
5706
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5707 5708

	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5709
		WARN_ON(link->sactive & (1 << qc->tag));
5710 5711 5712

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5713
		link->sactive |= 1 << qc->tag;
5714
	} else {
T
Tejun Heo 已提交
5715
		WARN_ON(link->sactive);
5716 5717

		ap->nr_active_links++;
T
Tejun Heo 已提交
5718
		link->active_tag = qc->tag;
5719 5720
	}

5721
	qc->flags |= ATA_QCFLAG_ACTIVE;
5722
	ap->qc_active |= 1 << qc->tag;
5723

L
Linus Torvalds 已提交
5724 5725 5726
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5727
				goto sg_err;
L
Linus Torvalds 已提交
5728 5729
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5730
				goto sg_err;
L
Linus Torvalds 已提交
5731 5732 5733 5734 5735 5736 5737
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5738 5739 5740 5741
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5742

5743 5744
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5745 5746 5747
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758
}

/**
 *	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
5759 5760
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5761
 *	LOCKING:
J
Jeff Garzik 已提交
5762
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5763 5764
 *
 *	RETURNS:
5765
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5766 5767
 */

5768
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5769 5770 5771
{
	struct ata_port *ap = qc->ap;

5772 5773 5774 5775 5776 5777
	/* 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:
5778
		case ATA_PROT_NODATA:
5779 5780 5781 5782 5783 5784
		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)
5785
				/* see ata_dma_blacklisted() */
5786 5787 5788 5789 5790 5791 5792
				BUG();
			break;
		default:
			break;
		}
	}

5793
	/* select the device */
L
Linus Torvalds 已提交
5794 5795
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5796
	/* start the command */
L
Linus Torvalds 已提交
5797 5798
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5799 5800 5801
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5802
		ata_tf_to_host(ap, &qc->tf);
5803 5804 5805
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5806
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5807

L
Linus Torvalds 已提交
5808 5809 5810
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5811
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5812

L
Linus Torvalds 已提交
5813 5814 5815
		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 */
5816
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5817 5818
		break;

5819 5820 5821
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5822

J
Jeff Garzik 已提交
5823
		ata_tf_to_host(ap, &qc->tf);
5824

5825 5826 5827
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5828
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5829 5830

			/* always send first data block using
5831
			 * the ata_pio_task() codepath.
5832
			 */
5833
		} else {
5834 5835 5836 5837
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5838
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5839 5840 5841 5842

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5843 5844
		}

L
Linus Torvalds 已提交
5845 5846 5847 5848
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5849 5850 5851
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5852
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5853

5854 5855 5856 5857 5858
		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))
5859
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5860 5861 5862
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5863
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5864

L
Linus Torvalds 已提交
5865 5866
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5867 5868 5869 5870
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5871
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5872 5873 5874 5875
		break;

	default:
		WARN_ON(1);
5876
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891
	}

	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
5892
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5893 5894 5895 5896 5897 5898 5899 5900
 *
 *	RETURNS:
 *	One if interrupt was handled, zero if not (shared irq).
 */

inline unsigned int ata_host_intr (struct ata_port *ap,
				   struct ata_queued_cmd *qc)
{
T
Tejun Heo 已提交
5901
	struct ata_eh_info *ehi = &ap->link.eh_info;
5902
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5903

5904
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5905
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5906

5907 5908 5909
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5910 5911 5912
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5913

5914 5915 5916 5917 5918
		/* 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
5919 5920
			goto idle_irq;
		break;
5921 5922 5923 5924 5925
	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
5926 5927
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5928 5929 5930 5931 5932 5933 5934

			/* 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);
5935 5936 5937 5938 5939 5940

			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;
			}
5941 5942 5943 5944
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5945 5946 5947 5948
	default:
		goto idle_irq;
	}

5949 5950 5951 5952
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5953

5954 5955 5956 5957
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5958

5959 5960
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5961

5962
	ata_hsm_move(ap, qc, status, 0);
5963 5964 5965 5966 5967

	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
5968 5969 5970 5971 5972 5973 5974
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5975 5976
		ata_chk_status(ap);
		ap->ops->irq_clear(ap);
5977
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5978
		return 1;
L
Linus Torvalds 已提交
5979 5980 5981 5982 5983 5984 5985
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5986
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5987
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5988
 *
J
Jeff Garzik 已提交
5989 5990 5991
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5992
 *	LOCKING:
J
Jeff Garzik 已提交
5993
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5994 5995
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5996
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5997 5998
 */

5999
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
6000
{
J
Jeff Garzik 已提交
6001
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
6002 6003 6004 6005 6006
	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
6007
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
6008

J
Jeff Garzik 已提交
6009
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
6010 6011
		struct ata_port *ap;

J
Jeff Garzik 已提交
6012
		ap = host->ports[i];
6013
		if (ap &&
J
Jeff Garzik 已提交
6014
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
6015 6016
			struct ata_queued_cmd *qc;

T
Tejun Heo 已提交
6017
			qc = ata_qc_from_tag(ap, ap->link.active_tag);
6018
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6019
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
6020 6021 6022 6023
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
6024
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
6025 6026 6027 6028

	return IRQ_RETVAL(handled);
}

6029 6030
/**
 *	sata_scr_valid - test whether SCRs are accessible
6031
 *	@link: ATA link to test SCR accessibility for
6032
 *
6033
 *	Test whether SCRs are accessible for @link.
6034 6035 6036 6037 6038 6039 6040
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
6041
int sata_scr_valid(struct ata_link *link)
6042
{
6043 6044
	struct ata_port *ap = link->ap;

6045
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6046 6047 6048 6049
}

/**
 *	sata_scr_read - read SCR register of the specified port
6050
 *	@link: ATA link to read SCR for
6051 6052 6053
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
6054
 *	Read SCR register @reg of @link into *@val.  This function is
6055 6056
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6057 6058
 *
 *	LOCKING:
6059
 *	None if @link is ap->link.  Kernel thread context otherwise.
6060 6061 6062 6063
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6064
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6065
{
6066 6067
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
6068

6069 6070 6071 6072 6073 6074
		if (sata_scr_valid(link))
			return ap->ops->scr_read(ap, reg, val);
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
6075 6076 6077 6078
}

/**
 *	sata_scr_write - write SCR register of the specified port
6079
 *	@link: ATA link to write SCR for
6080 6081 6082
 *	@reg: SCR to write
 *	@val: value to write
 *
6083
 *	Write @val to SCR register @reg of @link.  This function is
6084 6085
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6086 6087
 *
 *	LOCKING:
6088
 *	None if @link is ap->link.  Kernel thread context otherwise.
6089 6090 6091 6092
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6093
int sata_scr_write(struct ata_link *link, int reg, u32 val)
6094
{
6095 6096 6097 6098 6099 6100 6101
	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;
	}
6102

6103
	return sata_pmp_scr_write(link, reg, val);
6104 6105 6106 6107
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
6108
 *	@link: ATA link to write SCR for
6109 6110 6111 6112 6113 6114 6115
 *	@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:
6116
 *	None if @link is ap->link.  Kernel thread context otherwise.
6117 6118 6119 6120
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6121
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6122
{
6123 6124 6125
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
		int rc;
6126

6127 6128 6129 6130 6131 6132 6133
		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;
6134
	}
6135 6136

	return sata_pmp_scr_write(link, reg, val);
6137 6138 6139
}

/**
6140 6141
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
6142
 *
6143 6144 6145
 *	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).
6146 6147 6148 6149 6150 6151 6152
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
6153
int ata_link_online(struct ata_link *link)
6154 6155 6156
{
	u32 sstatus;

6157 6158
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
6159 6160 6161 6162 6163
		return 1;
	return 0;
}

/**
6164 6165
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
6166
 *
6167 6168 6169
 *	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).
6170 6171 6172 6173 6174 6175 6176
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
6177
int ata_link_offline(struct ata_link *link)
6178 6179 6180
{
	u32 sstatus;

6181 6182
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
6183 6184 6185
		return 1;
	return 0;
}
E
Edward Falk 已提交
6186

6187
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
6188
{
6189
	unsigned int err_mask;
J
Jens Axboe 已提交
6190 6191 6192 6193 6194
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

6195
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
6196 6197 6198 6199
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

6200 6201 6202 6203
	/* 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
	   a further flush command to continue the writeback until it 
	   does not error */
6204 6205 6206 6207 6208 6209 6210
	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
6211 6212
}

6213
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6214 6215 6216
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
6217 6218 6219 6220
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
6221 6222
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6223
		struct ata_link *link;
6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242

		/* 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;
6243 6244 6245 6246
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264

		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
6265 6266
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
6267 6268
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
6269
 *	Suspend @host.  Actual operation is performed by EH.  This
6270 6271 6272 6273 6274 6275 6276 6277 6278
 *	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
6279
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6280
{
6281
	int rc;
6282

J
Jeff Garzik 已提交
6283
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6284 6285
	if (rc == 0)
		host->dev->power.power_state = mesg;
6286 6287 6288 6289
	return rc;
}

/**
J
Jeff Garzik 已提交
6290 6291
 *	ata_host_resume - resume host
 *	@host: host to resume
6292
 *
J
Jeff Garzik 已提交
6293
 *	Resume @host.  Actual operation is performed by EH.  This
6294 6295 6296 6297 6298 6299
 *	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
6300
void ata_host_resume(struct ata_host *host)
6301
{
J
Jeff Garzik 已提交
6302 6303 6304
	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;
6305
}
6306
#endif
6307

6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319
/**
 *	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.
 */
6320
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
6321
{
6322
	struct device *dev = ap->dev;
6323
	int rc;
L
Linus Torvalds 已提交
6324

6325 6326
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
6327 6328 6329
	if (!ap->prd)
		return -ENOMEM;

6330
	rc = ata_pad_alloc(ap, dev);
6331
	if (rc)
6332
		return rc;
L
Linus Torvalds 已提交
6333

6334 6335
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
6336 6337 6338
	return 0;
}

6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349
/**
 *	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
6350 6351
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
6352 6353
	unsigned long flags;

6354
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
6355 6356
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
6357

6358 6359
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6360
	 * host lock.
6361
	 */
6362
	spin_lock_irqsave(ap->lock, flags);
6363
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6364
	dev->horkage = 0;
6365
	spin_unlock_irqrestore(ap->lock, flags);
6366

6367 6368
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6369 6370 6371 6372 6373
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

6374 6375 6376 6377
/**
 *	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
6378
 *	@pmp: Port multiplier port number
6379 6380 6381 6382 6383 6384
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
6385
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6386 6387 6388 6389 6390 6391 6392
{
	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
6393
	link->pmp = pmp;
6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419
	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.
 */
6420
int sata_link_init_spd(struct ata_link *link)
6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437
{
	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
6438
/**
6439 6440
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6441
 *
6442 6443 6444 6445
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6446
 *
L
Linus Torvalds 已提交
6447
 *	LOCKING:
6448
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6449
 */
6450
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6451
{
6452
	struct ata_port *ap;
L
Linus Torvalds 已提交
6453

6454 6455 6456 6457 6458 6459
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;

6460
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6461
	ap->lock = &host->lock;
6462
	ap->flags = ATA_FLAG_DISABLED;
6463
	ap->print_id = -1;
L
Linus Torvalds 已提交
6464
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6465
	ap->host = host;
6466
	ap->dev = host->dev;
L
Linus Torvalds 已提交
6467
	ap->last_ctl = 0xFF;
6468 6469 6470 6471 6472 6473

#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
6474
#else
6475
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6476
#endif
L
Linus Torvalds 已提交
6477

6478 6479 6480
	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);
6481
	INIT_LIST_HEAD(&ap->eh_done_q);
6482
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6483 6484 6485
	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
6486

6487 6488
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
6489
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
6490 6491 6492 6493 6494 6495 6496 6497

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
	return ap;
}

6498 6499 6500 6501 6502 6503 6504 6505
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6506 6507 6508 6509
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6510 6511 6512
			ap->ops->port_stop(ap);
	}

6513
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6514
		host->ops->host_stop(host);
6515

6516 6517 6518
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6519 6520 6521 6522
		if (!ap)
			continue;

		if (ap->scsi_host)
6523 6524
			scsi_host_put(ap->scsi_host);

6525
		kfree(ap->pmp_link);
6526
		kfree(ap);
6527 6528 6529
		host->ports[i] = NULL;
	}

6530
	dev_set_drvdata(gendev, NULL);
6531 6532
}

6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597
/**
 *	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;
}

6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635
/**
 *	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;
6636
		ap->link.flags |= pi->link_flags;
6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647
		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;
}

6648 6649 6650 6651 6652 6653 6654
/**
 *	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
6655 6656
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673
 *
 *	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)
{
	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];

6674 6675 6676
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701
		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);
	}

	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);
	}
	return rc;
}

6702
/**
J
Jeff Garzik 已提交
6703 6704 6705 6706 6707
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6708 6709 6710 6711 6712
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6713
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6714 6715
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6716
{
J
Jeff Garzik 已提交
6717 6718 6719 6720
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6721 6722
}

6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765
/**
 *	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;

6766 6767 6768
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6769 6770 6771 6772 6773 6774 6775 6776 6777 6778
	/* 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 */
6779
		sata_link_init_spd(&ap->link);
6780

6781
		/* print per-port info to dmesg */
6782 6783 6784
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6785
		if (!ata_port_is_dummy(ap)) {
6786 6787
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6788
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6789
					ata_mode_string(xfer_mask),
6790
					ap->link.eh_info.desc);
6791 6792
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803
			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
6804
			struct ata_eh_info *ehi = &ap->link.eh_info;
6805 6806 6807 6808 6809 6810 6811
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
			spin_lock_irqsave(ap->lock, flags);

6812 6813
			ehi->probe_mask =
				(1 << ata_link_max_devices(&ap->link)) - 1;
6814 6815 6816
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

6817
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845
			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];

6846
		ata_scsi_scan_host(ap, 1);
6847 6848 6849 6850 6851
	}

	return 0;
}

6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871 6872 6873 6874
/**
 *	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.
 *
 *	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)
{
6875
	int i, rc;
6876 6877 6878 6879 6880 6881 6882 6883 6884 6885

	rc = ata_host_start(host);
	if (rc)
		return rc;

	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6886 6887
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6888

6889 6890 6891 6892 6893 6894 6895 6896
	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;
}

6897 6898 6899 6900 6901 6902 6903 6904 6905 6906 6907 6908 6909 6910
/**
 *	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).
 */
void ata_port_detach(struct ata_port *ap)
{
	unsigned long flags;
6911
	struct ata_link *link;
6912
	struct ata_device *dev;
6913 6914

	if (!ap->ops->error_handler)
6915
		goto skip_eh;
6916 6917

	/* tell EH we're leaving & flush EH */
6918
	spin_lock_irqsave(ap->lock, flags);
6919
	ap->pflags |= ATA_PFLAG_UNLOADING;
6920
	spin_unlock_irqrestore(ap->lock, flags);
6921 6922 6923 6924 6925 6926

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6927
	spin_lock_irqsave(ap->lock, flags);
6928

6929 6930 6931 6932
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
6933

6934
	spin_unlock_irqrestore(ap->lock, flags);
6935 6936 6937 6938 6939

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6940
	spin_lock_irqsave(ap->lock, flags);
6941
	ata_port_freeze(ap);	/* won't be thawed */
6942
	spin_unlock_irqrestore(ap->lock, flags);
6943 6944

	ata_port_wait_eh(ap);
6945
	cancel_rearming_delayed_work(&ap->hotplug_task);
6946

6947
 skip_eh:
6948
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6949
	scsi_remove_host(ap->scsi_host);
6950 6951
}

T
Tejun Heo 已提交
6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968
/**
 *	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
6969 6970 6971
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6972 6973 6974 6975 6976 6977 6978
 *
 *	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
6979
 */
E
Edward Falk 已提交
6980

L
Linus Torvalds 已提交
6981 6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994
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
6995

6996 6997
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6998 6999 7000 7001
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
7002 7003 7004
 *	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
7005 7006 7007 7008
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
7009
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
7010
{
7011
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
7012
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
7013

T
Tejun Heo 已提交
7014
	ata_host_detach(host);
L
Linus Torvalds 已提交
7015 7016 7017
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
7018
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
7019 7020 7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049
{
	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
7050

7051
#ifdef CONFIG_PM
7052
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
7053 7054
{
	pci_save_state(pdev);
7055
	pci_disable_device(pdev);
7056

7057
	if (mesg.event == PM_EVENT_SUSPEND)
7058
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
7059 7060
}

7061
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
7062
{
7063 7064
	int rc;

J
Jens Axboe 已提交
7065 7066
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
7067

T
Tejun Heo 已提交
7068
	rc = pcim_enable_device(pdev);
7069 7070 7071 7072 7073 7074
	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
7075
	pci_set_master(pdev);
7076
	return 0;
7077 7078
}

7079
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7080
{
J
Jeff Garzik 已提交
7081
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7082 7083
	int rc = 0;

J
Jeff Garzik 已提交
7084
	rc = ata_host_suspend(host, mesg);
7085 7086 7087
	if (rc)
		return rc;

7088
	ata_pci_device_do_suspend(pdev, mesg);
7089 7090 7091 7092 7093 7094

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
7095
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7096
	int rc;
7097

7098 7099 7100 7101
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
7102
}
7103 7104
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
7105 7106 7107 7108 7109
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
7110
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
7111 7112 7113 7114
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

7115 7116 7117 7118 7119 7120
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
7121 7122 7123 7124 7125 7126 7127
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
7128
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
7129 7130
}

7131
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
7132 7133
module_exit(ata_exit);

7134
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
7135
static DEFINE_SPINLOCK(ata_ratelimit_lock);
7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154

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;
}

7155 7156 7157 7158 7159 7160 7161 7162 7163 7164 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 7193 7194 7195 7196 7197 7198 7199 7200
/**
 *	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;
}

T
Tejun Heo 已提交
7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 7217 7218 7219 7220 7221 7222 7223 7224 7225 7226 7227 7228 7229 7230 7231 7232
/*
 * 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,
};

7233 7234 7235 7236
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
7237 7238 7239 7240 7241 7242 7243
/*
 * 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.
 */

7244 7245 7246
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
7247
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7248
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
7249 7250
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
7251
EXPORT_SYMBOL_GPL(ata_host_init);
7252
EXPORT_SYMBOL_GPL(ata_host_alloc);
7253
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7254
EXPORT_SYMBOL_GPL(ata_host_start);
7255
EXPORT_SYMBOL_GPL(ata_host_register);
7256
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
7257
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
7258 7259
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
7260
EXPORT_SYMBOL_GPL(ata_hsm_move);
7261
EXPORT_SYMBOL_GPL(ata_qc_complete);
7262
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
7263 7264 7265 7266 7267
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);
7268
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
7269 7270 7271 7272 7273 7274
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);
7275
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
7276
EXPORT_SYMBOL_GPL(ata_interrupt);
7277
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
7278 7279
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7280
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
L
Linus Torvalds 已提交
7281
EXPORT_SYMBOL_GPL(ata_qc_prep);
7282
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7283
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
7284 7285 7286 7287 7288
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);
7289 7290 7291 7292 7293
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);
L
Linus Torvalds 已提交
7294
EXPORT_SYMBOL_GPL(ata_port_probe);
7295
EXPORT_SYMBOL_GPL(ata_dev_disable);
7296
EXPORT_SYMBOL_GPL(sata_set_spd);
7297 7298
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
L
Linus Torvalds 已提交
7299 7300 7301
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
7302
EXPORT_SYMBOL_GPL(ata_std_prereset);
7303
EXPORT_SYMBOL_GPL(ata_std_softreset);
T
Tejun Heo 已提交
7304
EXPORT_SYMBOL_GPL(sata_link_hardreset);
7305 7306
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
7307 7308
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
7309
EXPORT_SYMBOL_GPL(ata_port_disable);
7310
EXPORT_SYMBOL_GPL(ata_ratelimit);
7311
EXPORT_SYMBOL_GPL(ata_wait_register);
7312
EXPORT_SYMBOL_GPL(ata_busy_sleep);
7313
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
7314
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
7315 7316 7317
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7318
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7319
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
7320
EXPORT_SYMBOL_GPL(ata_host_intr);
7321 7322 7323 7324
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);
7325 7326
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
7327
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
7328 7329
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
7330
#endif /* CONFIG_PM */
7331 7332
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
7333
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
L
Linus Torvalds 已提交
7334 7335
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

7336
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
7337 7338 7339
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
7340 7341
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
7342
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
T
Tejun Heo 已提交
7343
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7344
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
L
Linus Torvalds 已提交
7345 7346
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7347
#ifdef CONFIG_PM
7348 7349
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
7350 7351
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7352
#endif /* CONFIG_PM */
A
Alan Cox 已提交
7353 7354
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
7355
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
7356

7357
EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7358 7359 7360 7361 7362
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);

T
Tejun Heo 已提交
7363 7364 7365
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7366 7367 7368 7369
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
7370
EXPORT_SYMBOL_GPL(ata_eng_timeout);
7371
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7372
EXPORT_SYMBOL_GPL(ata_link_abort);
7373
EXPORT_SYMBOL_GPL(ata_port_abort);
7374
EXPORT_SYMBOL_GPL(ata_port_freeze);
7375
EXPORT_SYMBOL_GPL(sata_async_notification);
7376 7377
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7378 7379
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
7380
EXPORT_SYMBOL_GPL(ata_do_eh);
7381
EXPORT_SYMBOL_GPL(ata_irq_on);
A
Akira Iguchi 已提交
7382
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
7383 7384 7385 7386 7387

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
EXPORT_SYMBOL_GPL(ata_cable_sata);