libata-core.c 183.5 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;
927 928 929 930 931 932 933 934 935 936
	tf.device |= ATA_LBA;

	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	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;

991 992 993 994 995 996 997 998 999 1000 1001
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	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 1398 1399 1400 1401 1402 1403 1404 1405
 *
 *	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.
1406 1407 1408
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1409
 */
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,
			      unsigned int n_elem)
1414
{
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1415 1416
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1417 1418
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1419
	unsigned int tag, preempted_tag;
1420
	u32 preempted_sactive, preempted_qc_active;
1421
	int preempted_nr_active_links;
1422
	DECLARE_COMPLETION_ONSTACK(wait);
1423
	unsigned long flags;
1424
	unsigned int err_mask;
1425
	int rc;
1426

1427
	spin_lock_irqsave(ap->lock, flags);
1428

1429
	/* no internal command while frozen */
1430
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1431
		spin_unlock_irqrestore(ap->lock, flags);
1432 1433 1434
		return AC_ERR_SYSTEM;
	}

1435
	/* initialize internal qc */
1436

1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
	/* 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;

1447
	if (test_and_set_bit(tag, &ap->qc_allocated))
1448
		BUG();
1449
	qc = __ata_qc_from_tag(ap, tag);
1450 1451 1452 1453 1454 1455 1456

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

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1457 1458
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1459
	preempted_qc_active = ap->qc_active;
1460
	preempted_nr_active_links = ap->nr_active_links;
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1461 1462
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1463
	ap->qc_active = 0;
1464
	ap->nr_active_links = 0;
1465 1466

	/* prepare & issue qc */
1467
	qc->tf = *tf;
1468 1469
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1470
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1471 1472
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1473 1474 1475 1476 1477 1478
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1479
		qc->nbytes = buflen;
1480 1481
	}

1482
	qc->private_data = &wait;
1483 1484
	qc->complete_fn = ata_qc_complete_internal;

1485
	ata_qc_issue(qc);
1486

1487
	spin_unlock_irqrestore(ap->lock, flags);
1488

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	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1490 1491

	ata_port_flush_task(ap);
1492

1493
	if (!rc) {
1494
		spin_lock_irqsave(ap->lock, flags);
1495 1496 1497

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1498 1499
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1500
		 */
1501
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1502 1503 1504 1505 1506 1507
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1508

1509 1510
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
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					"qc timeout (cmd 0x%x)\n", command);
1512 1513
		}

1514
		spin_unlock_irqrestore(ap->lock, flags);
1515 1516
	}

1517 1518 1519 1520
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
	/* 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;
1531 1532
	}

1533
	/* finish up */
1534
	spin_lock_irqsave(ap->lock, flags);
1535

1536
	*tf = qc->result_tf;
1537 1538 1539
	err_mask = qc->err_mask;

	ata_qc_free(qc);
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1540 1541
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1542
	ap->qc_active = preempted_qc_active;
1543
	ap->nr_active_links = preempted_nr_active_links;
1544

1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
	/* 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.
	 */
1556
	if (ap->flags & ATA_FLAG_DISABLED) {
1557 1558 1559 1560
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1561
	spin_unlock_irqrestore(ap->lock, flags);
1562

1563
	return err_mask;
1564 1565
}

1566
/**
1567
 *	ata_exec_internal - execute libata internal command
1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
 *	@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
 *
 *	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,
			   int dma_dir, void *buf, unsigned int buflen)
{
1588 1589
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1590

1591 1592 1593 1594 1595 1596
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1597

1598
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1599 1600
}

1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
/**
 *	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
1614
 */
1615
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1616 1617 1618 1619 1620 1621 1622 1623 1624
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1625
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1626 1627
}

1628 1629 1630 1631 1632 1633 1634
/**
 *	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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1636 1637
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
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1638 1639
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
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1640
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1641
		return 0;
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1642 1643 1644 1645 1646
	/* 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))
1647
		return 1;
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1648 1649
	return 0;
}
1650

A
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1651 1652 1653 1654 1655 1656 1657
/**
 *	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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1658

A
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1659 1660
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1661 1662
	/* 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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1663
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1664 1665 1666 1667
		/* 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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1668 1669
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1670 1671
		}
	}
A
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1672
	return 3 << ATA_SHIFT_PIO;
1673 1674
}

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1675
/**
1676 1677 1678
 *	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)
1679
 *	@flags: ATA_READID_* flags
1680
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1681
 *
1682 1683
 *	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
1684 1685
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1686
 *
1687 1688 1689
 *	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
1690
 *	LOCKING:
1691 1692 1693 1694
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1695
 */
1696
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1697
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1698
{
T
Tejun Heo 已提交
1699
	struct ata_port *ap = dev->link->ap;
1700
	unsigned int class = *p_class;
1701
	struct ata_taskfile tf;
1702 1703
	unsigned int err_mask = 0;
	const char *reason;
1704
	int may_fallback = 1, tried_spinup = 0;
1705
	int rc;
L
Linus Torvalds 已提交
1706

1707
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1708
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1709

1710 1711
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1712
	ata_tf_init(dev, &tf);
1713

1714 1715
	switch (class) {
	case ATA_DEV_ATA:
1716
		tf.command = ATA_CMD_ID_ATA;
1717 1718
		break;
	case ATA_DEV_ATAPI:
1719
		tf.command = ATA_CMD_ID_ATAPI;
1720 1721 1722 1723 1724
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1725 1726
	}

1727
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737

	/* 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
1738

T
Tejun Heo 已提交
1739
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1740
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1741
	if (err_mask) {
1742
		if (err_mask & AC_ERR_NODEV_HINT) {
1743
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1744
				ap->print_id, dev->devno);
1745 1746 1747
			return -ENOENT;
		}

1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
		/* 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;
		}

1763 1764
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1765 1766 1767
		goto err_out;
	}

1768 1769 1770 1771 1772
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1773
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1774

1775
	/* sanity check */
1776
	rc = -EINVAL;
A
Alan Cox 已提交
1777
	reason = "device reports invalid type";
1778 1779 1780 1781 1782 1783 1784

	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;
1785 1786
	}

1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
	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;
		err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1800
		if (err_mask && id[2] != 0x738c) {
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812
			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;
	}

1813
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1814 1815 1816
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
1817 1818
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1819 1820
		 * anything else..
		 * Some drives were very specific about that exact sequence.
1821 1822 1823
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
1824 1825
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1826
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1827 1828 1829 1830 1831 1832 1833 1834 1835
			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.
			 */
1836
			flags &= ~ATA_READID_POSTRESET;
1837 1838 1839 1840 1841
			goto retry;
		}
	}

	*p_class = class;
1842

1843 1844 1845
	return 0;

 err_out:
T
Tejun Heo 已提交
1846
	if (ata_msg_warn(ap))
1847
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1848
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1849 1850 1851
	return rc;
}

T
Tejun Heo 已提交
1852
static inline u8 ata_dev_knobble(struct ata_device *dev)
1853
{
T
Tejun Heo 已提交
1854 1855
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1856 1857
}

1858 1859 1860
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
1861
	struct ata_port *ap = dev->link->ap;
1862 1863 1864 1865 1866 1867
	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
1868
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
1869 1870 1871
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1872
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1873
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1874 1875 1876 1877 1878 1879 1880 1881 1882
		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);
}

1883
/**
1884 1885 1886 1887 1888
 *	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.
1889 1890
 *
 *	LOCKING:
1891 1892 1893 1894
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1895
 */
1896
int ata_dev_configure(struct ata_device *dev)
1897
{
T
Tejun Heo 已提交
1898 1899
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
1900
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1901
	const u16 *id = dev->id;
1902
	unsigned int xfer_mask;
1903
	char revbuf[7];		/* XYZ-99\0 */
1904 1905
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1906
	int rc;
1907

1908
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1909 1910
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1911
		return 0;
1912 1913
	}

1914
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1915
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1916

T
Tejun Heo 已提交
1917 1918 1919
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
1920 1921 1922 1923
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1924

T
Tejun Heo 已提交
1925 1926 1927 1928 1929
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

1930
	/* print device capabilities */
1931
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1932 1933 1934
		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",
1935
			       __FUNCTION__,
1936 1937
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1938

1939
	/* initialize to-be-configured parameters */
1940
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1941 1942 1943 1944 1945 1946 1947
	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
1948 1949 1950 1951
	/*
	 * common ATA, ATAPI feature tests
	 */

1952
	/* find max transfer mode; for printk only */
1953
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1954

1955 1956
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1957

1958 1959 1960 1961 1962 1963 1964
	/* 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
1965 1966
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1967 1968
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1969 1970 1971
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1972 1973 1974 1975 1976
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1977
		dev->n_sectors = ata_id_n_sectors(id);
1978

1979 1980 1981
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1982
		if (ata_id_has_lba(id)) {
1983
			const char *lba_desc;
1984
			char ncq_desc[20];
1985

1986 1987
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1988
			if (ata_id_has_lba48(id)) {
1989
				dev->flags |= ATA_DFLAG_LBA48;
1990
				lba_desc = "LBA48";
1991 1992 1993 1994

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1995
			}
1996

1997 1998 1999
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2000
			/* print device info to dmesg */
2001 2002 2003 2004 2005 2006 2007
			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",
2008
					(unsigned long long)dev->n_sectors,
2009 2010
					dev->multi_count, lba_desc, ncq_desc);
			}
2011
		} else {
2012 2013 2014
			/* CHS */

			/* Default translation */
2015 2016 2017
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2018

2019
			if (ata_id_current_chs_valid(id)) {
2020
				/* Current CHS translation is valid. */
2021 2022 2023
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2024 2025 2026
			}

			/* print device info to dmesg */
2027
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2028
				ata_dev_printk(dev, KERN_INFO,
2029 2030 2031
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2032
				ata_dev_printk(dev, KERN_INFO,
2033 2034 2035 2036 2037
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2038 2039
		}

2040
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2041 2042 2043
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2044
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2045 2046
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2047
		u32 sntf;
2048

2049
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2050
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2051
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2052 2053
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2054
			rc = -EINVAL;
L
Linus Torvalds 已提交
2055 2056
			goto err_out_nosup;
		}
2057
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2058

2059 2060 2061 2062
		/* 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.
2063
		 */
2064 2065 2066
		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
2067 2068
			unsigned int err_mask;

2069
			/* issue SET feature command to turn this on */
T
Tejun Heo 已提交
2070 2071
			err_mask = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
			if (err_mask)
2072
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2073 2074 2075
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2076
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2077 2078
				atapi_an_string = ", ATAPI AN";
			}
2079 2080
		}

2081
		if (ata_id_cdb_intr(dev->id)) {
2082
			dev->flags |= ATA_DFLAG_CDB_INTR;
2083 2084
			cdb_intr_string = ", CDB intr";
		}
2085

L
Linus Torvalds 已提交
2086
		/* print device info to dmesg */
2087
		if (ata_msg_drv(ap) && print_info)
2088
			ata_dev_printk(dev, KERN_INFO,
T
Tejun Heo 已提交
2089
				       "ATAPI: %s, %s, max %s%s%s\n",
2090
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2091
				       ata_mode_string(xfer_mask),
T
Tejun Heo 已提交
2092
				       cdb_intr_string, atapi_an_string);
L
Linus Torvalds 已提交
2093 2094
	}

2095 2096 2097 2098 2099
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111
	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");
		}
	}

2112
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2113
	if (ata_dev_knobble(dev)) {
2114
		if (ata_msg_drv(ap) && print_info)
2115 2116
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2117
		dev->udma_mask &= ATA_UDMA5;
2118 2119 2120
		dev->max_sectors = ATA_MAX_SECTORS;
	}

T
Tejun Heo 已提交
2121
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2122 2123
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2124

2125
	if (ap->ops->dev_config)
2126
		ap->ops->dev_config(dev);
2127

2128 2129 2130
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2131
	return 0;
L
Linus Torvalds 已提交
2132 2133

err_out_nosup:
2134
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2135 2136
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2137
	return rc;
L
Linus Torvalds 已提交
2138 2139
}

A
Alan Cox 已提交
2140
/**
2141
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2142 2143
 *	@ap: port
 *
2144
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2145 2146 2147 2148 2149 2150 2151 2152 2153
 *	detection.
 */

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

/**
2154
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2155 2156
 *	@ap: port
 *
2157
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189
 *	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
2190 2191 2192 2193
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2194 2195 2196 2197
 *	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
2198
 *	LOCKING:
J
Jeff Garzik 已提交
2199
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2200 2201
 *
 *	RETURNS:
2202
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2203 2204
 */

2205
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2206
{
2207
	unsigned int classes[ATA_MAX_DEVICES];
2208
	int tries[ATA_MAX_DEVICES];
2209
	int rc;
2210
	struct ata_device *dev;
L
Linus Torvalds 已提交
2211

2212
	ata_port_probe(ap);
2213

2214 2215
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2216 2217

 retry:
2218
	/* reset and determine device classes */
2219
	ap->ops->phy_reset(ap);
2220

2221
	ata_link_for_each_dev(dev, &ap->link) {
2222 2223 2224 2225 2226
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2227

2228
		dev->class = ATA_DEV_UNKNOWN;
2229
	}
L
Linus Torvalds 已提交
2230

2231
	ata_port_probe(ap);
2232

A
Alan Cox 已提交
2233 2234 2235
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

2236 2237
	ata_link_for_each_dev(dev, &ap->link)
		dev->pio_mode = XFER_PIO_0;
A
Alan Cox 已提交
2238

2239 2240 2241 2242
	/* 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 */

2243 2244 2245
	ata_link_for_each_dev(dev, &ap->link) {
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2246

2247
		if (!ata_dev_enabled(dev))
2248 2249
			continue;

2250 2251
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2252 2253
		if (rc)
			goto fail;
2254 2255
	}

A
Alan Cox 已提交
2256 2257 2258 2259
	/* 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
2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
	/* 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;
	}

2271 2272 2273
	/* 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 */

2274
	ata_link_for_each_dev(dev, &ap->link) {
2275 2276
		if (!ata_dev_enabled(dev))
			continue;
2277

T
Tejun Heo 已提交
2278
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2279
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2280
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2281 2282
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2283 2284
	}

2285
	/* configure transfer mode */
2286
	rc = ata_set_mode(&ap->link, &dev);
2287
	if (rc)
2288
		goto fail;
L
Linus Torvalds 已提交
2289

2290 2291
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2292
			return 0;
L
Linus Torvalds 已提交
2293

2294 2295
	/* no device present, disable port */
	ata_port_disable(ap);
2296
	return -ENODEV;
2297 2298

 fail:
2299 2300
	tries[dev->devno]--;

2301 2302
	switch (rc) {
	case -EINVAL:
2303
		/* eeek, something went very wrong, give up */
2304 2305
		tries[dev->devno] = 0;
		break;
2306 2307 2308 2309

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2310
	case -EIO:
2311 2312 2313 2314
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2315
			sata_down_spd_limit(&ap->link);
2316 2317
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2318 2319
	}

2320
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2321
		ata_dev_disable(dev);
2322

2323
	goto retry;
L
Linus Torvalds 已提交
2324 2325 2326
}

/**
J
Jeff Garzik 已提交
2327 2328
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2329
 *
J
Jeff Garzik 已提交
2330 2331 2332
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2333
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2334
 *	serialization.
L
Linus Torvalds 已提交
2335 2336 2337 2338
 */

void ata_port_probe(struct ata_port *ap)
{
2339
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2340 2341
}

2342 2343
/**
 *	sata_print_link_status - Print SATA link status
2344
 *	@link: SATA link to printk link status about
2345 2346 2347 2348 2349 2350
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2351
void sata_print_link_status(struct ata_link *link)
2352
{
2353
	u32 sstatus, scontrol, tmp;
2354

2355
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2356
		return;
2357
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2358

2359
	if (ata_link_online(link)) {
2360
		tmp = (sstatus >> 4) & 0xf;
2361
		ata_link_printk(link, KERN_INFO,
2362 2363
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2364
	} else {
2365
		ata_link_printk(link, KERN_INFO,
2366 2367
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2368 2369 2370
	}
}

L
Linus Torvalds 已提交
2371
/**
J
Jeff Garzik 已提交
2372 2373
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2374
 *
J
Jeff Garzik 已提交
2375 2376 2377
 *	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
2378 2379
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2380
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2381 2382 2383 2384
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
2385
	struct ata_link *link = &ap->link;
L
Linus Torvalds 已提交
2386
	unsigned long timeout = jiffies + (HZ * 5);
2387
	u32 sstatus;
L
Linus Torvalds 已提交
2388 2389

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2390
		/* issue phy wake/reset */
2391
		sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2392 2393 2394
		/* 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
2395
	}
2396
	/* phy wake/clear reset */
2397
	sata_scr_write_flush(link, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2398 2399 2400 2401

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2402
		sata_scr_read(link, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2403 2404 2405 2406
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2407
	/* print link status */
2408
	sata_print_link_status(link);
2409

2410
	/* TODO: phy layer with polling, timeouts, etc. */
2411
	if (!ata_link_offline(link))
L
Linus Torvalds 已提交
2412
		ata_port_probe(ap);
2413
	else
L
Linus Torvalds 已提交
2414 2415
		ata_port_disable(ap);

2416
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427
		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
2428 2429
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2430
 *
J
Jeff Garzik 已提交
2431 2432
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2433 2434
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2435
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2436 2437 2438 2439 2440
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2441
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2442 2443 2444 2445
		return;
	ata_bus_reset(ap);
}

2446 2447 2448 2449 2450 2451 2452
/**
 *	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
 */
2453

T
Tejun Heo 已提交
2454
struct ata_device *ata_dev_pair(struct ata_device *adev)
2455
{
T
Tejun Heo 已提交
2456 2457
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2458
	if (!ata_dev_enabled(pair))
2459 2460 2461 2462
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2463
/**
J
Jeff Garzik 已提交
2464 2465
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2466
 *
J
Jeff Garzik 已提交
2467 2468 2469 2470 2471
 *	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
2472
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2473
 *	serialization.
L
Linus Torvalds 已提交
2474 2475 2476 2477
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2478 2479
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2480
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2481 2482
}

2483
/**
2484
 *	sata_down_spd_limit - adjust SATA spd limit downward
2485
 *	@link: Link to adjust SATA spd limit for
2486
 *
2487
 *	Adjust SATA spd limit of @link downward.  Note that this
2488
 *	function only adjusts the limit.  The change must be applied
2489
 *	using sata_set_spd().
2490 2491 2492 2493 2494 2495 2496
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2497
int sata_down_spd_limit(struct ata_link *link)
2498
{
2499 2500
	u32 sstatus, spd, mask;
	int rc, highbit;
2501

2502
	if (!sata_scr_valid(link))
2503 2504 2505
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2506
	 * If not, use cached value in link->sata_spd.
2507
	 */
2508
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2509 2510 2511
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2512
		spd = link->sata_spd;
2513

2514
	mask = link->sata_spd_limit;
2515 2516
	if (mask <= 1)
		return -EINVAL;
2517 2518

	/* unconditionally mask off the highest bit */
2519 2520 2521
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2522 2523 2524 2525 2526 2527 2528 2529 2530
	/* 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? */
2531 2532 2533
	if (!mask)
		return -EINVAL;

2534
	link->sata_spd_limit = mask;
2535

2536
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2537
			sata_spd_string(fls(mask)));
2538 2539 2540 2541

	return 0;
}

2542
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2543 2544 2545
{
	u32 spd, limit;

2546
	if (link->sata_spd_limit == UINT_MAX)
2547 2548
		limit = 0;
	else
2549
		limit = fls(link->sata_spd_limit);
2550 2551 2552 2553 2554 2555 2556 2557

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

	return spd != limit;
}

/**
2558
 *	sata_set_spd_needed - is SATA spd configuration needed
2559
 *	@link: Link in question
2560 2561
 *
 *	Test whether the spd limit in SControl matches
2562
 *	@link->sata_spd_limit.  This function is used to determine
2563 2564 2565 2566 2567 2568 2569 2570 2571
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2572
int sata_set_spd_needed(struct ata_link *link)
2573 2574 2575
{
	u32 scontrol;

2576
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2577 2578
		return 0;

2579
	return __sata_set_spd_needed(link, &scontrol);
2580 2581 2582
}

/**
2583
 *	sata_set_spd - set SATA spd according to spd limit
2584
 *	@link: Link to set SATA spd for
2585
 *
2586
 *	Set SATA spd of @link according to sata_spd_limit.
2587 2588 2589 2590 2591 2592
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2593
 *	changed.  Negative errno if SCR registers are inaccessible.
2594
 */
2595
int sata_set_spd(struct ata_link *link)
2596 2597
{
	u32 scontrol;
2598
	int rc;
2599

2600
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2601
		return rc;
2602

2603
	if (!__sata_set_spd_needed(link, &scontrol))
2604 2605
		return 0;

2606
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2607 2608
		return rc;

2609 2610 2611
	return 1;
}

A
Alan Cox 已提交
2612 2613 2614 2615 2616
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2617
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2618
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2619 2620 2621
 * 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
2622 2623 2624 2625 2626 2627 2628 2629 2630
 */

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 },

2631 2632
	{ 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
2633 2634 2635 2636 2637
	{ 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 }, */
2638

A
Alan Cox 已提交
2639 2640 2641
	{ 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 },
2642

A
Alan Cox 已提交
2643 2644 2645 2646
	{ 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 },

2647 2648
	{ 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
2649 2650 2651 2652 2653 2654 2655 2656 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
	{ 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
2694
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2695
			return NULL;
2696
	return t;
A
Alan Cox 已提交
2697 2698 2699 2700 2701 2702 2703 2704 2705
}

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;

	/*
2706
	 * Find the mode.
2707
	 */
A
Alan Cox 已提交
2708 2709 2710 2711

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

2712 2713
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733
	/*
	 * 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.
	 */

2734
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2735 2736

	/*
2737 2738 2739
	 * 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
2740 2741
	 */

2742
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2743 2744 2745 2746 2747
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2748
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759
	 */

	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
2760

2761 2762 2763 2764 2765
	/* 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
2766 2767 2768 2769

	return 0;
}

2770 2771 2772
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2773
 *	@sel: ATA_DNXFER_* selector
2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784
 *
 *	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
 */
2785
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2786
{
2787 2788 2789 2790
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2791

2792 2793
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2794

2795 2796 2797 2798
	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);
2799

2800 2801 2802 2803 2804 2805 2806 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
	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);
	}
2852 2853 2854 2855 2856 2857 2858

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

	return 0;
}

T
Tejun Heo 已提交
2859
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2860
{
T
Tejun Heo 已提交
2861
	struct ata_eh_context *ehc = &dev->link->eh_context;
2862 2863
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2864

2865
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2866 2867 2868
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2869
	err_mask = ata_dev_set_xfermode(dev);
2870 2871 2872
	/* 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
2873 2874 2875 2876 2877
	/* 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;
2878
	if (err_mask) {
2879 2880
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2881 2882
		return -EIO;
	}
L
Linus Torvalds 已提交
2883

2884
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
2885
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
2886
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2887
	if (rc)
2888
		return rc;
2889

2890 2891
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2892

2893 2894
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2895
	return 0;
L
Linus Torvalds 已提交
2896 2897 2898
}

/**
2899
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2900
 *	@link: link on which timings will be programmed
2901
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2902
 *
2903 2904 2905
 *	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
2906
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2907
 *
L
Linus Torvalds 已提交
2908
 *	LOCKING:
J
Jeff Garzik 已提交
2909
 *	PCI/etc. bus probe sem.
2910 2911 2912
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2913
 */
2914

2915
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2916
{
2917
	struct ata_port *ap = link->ap;
2918
	struct ata_device *dev;
2919
	int rc = 0, used_dma = 0, found = 0;
2920

2921
	/* step 1: calculate xfer_mask */
2922
	ata_link_for_each_dev(dev, link) {
2923
		unsigned int pio_mask, dma_mask;
2924
		unsigned int mode_mask;
2925

2926
		if (!ata_dev_enabled(dev))
2927 2928
			continue;

2929 2930 2931 2932 2933 2934
		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
2935
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2936

2937 2938
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
2939 2940 2941 2942 2943 2944

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

2945 2946
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2947

2948
		found = 1;
2949 2950
		if (dev->dma_mode)
			used_dma = 1;
2951
	}
2952
	if (!found)
2953
		goto out;
2954 2955

	/* step 2: always set host PIO timings */
2956
	ata_link_for_each_dev(dev, link) {
2957 2958 2959 2960
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2961
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2962
			rc = -EINVAL;
2963
			goto out;
2964 2965 2966 2967 2968 2969 2970
		}

		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
2971

2972
	/* step 3: set host DMA timings */
2973
	ata_link_for_each_dev(dev, link) {
2974 2975 2976 2977 2978 2979 2980 2981
		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
2982 2983

	/* step 4: update devices' xfer mode */
2984
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
2985
		/* don't update suspended devices' xfer mode */
2986
		if (!ata_dev_enabled(dev))
2987 2988
			continue;

T
Tejun Heo 已提交
2989
		rc = ata_dev_set_mode(dev);
2990
		if (rc)
2991
			goto out;
2992
	}
L
Linus Torvalds 已提交
2993

2994 2995
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2996
	 */
J
Jeff Garzik 已提交
2997
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2998
		ap->host->simplex_claimed = ap;
2999

3000 3001 3002 3003
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3004 3005
}

3006 3007
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
3008
 *	@link: link on which timings will be programmed
3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020
 *	@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
 */
3021
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3022
{
3023 3024
	struct ata_port *ap = link->ap;

3025 3026
	/* has private set_mode? */
	if (ap->ops->set_mode)
3027 3028
		return ap->ops->set_mode(link, r_failed_dev);
	return ata_do_set_mode(link, r_failed_dev);
3029 3030
}

3031 3032 3033 3034 3035 3036 3037 3038 3039 3040
/**
 *	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
3041
 *	spin_lock_irqsave(host lock)
3042 3043 3044 3045 3046 3047 3048 3049 3050
 */

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
3051 3052 3053 3054 3055 3056
/**
 *	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
3057 3058 3059
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
3060 3061 3062 3063 3064
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
3065
 */
3066 3067
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
3068 3069 3070 3071 3072 3073 3074
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
3075 3076
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3077 3078 3079 3080
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

3081
	if (status != 0xff && (status & ATA_BUSY))
3082
		ata_port_printk(ap, KERN_WARNING,
3083 3084
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
3085 3086

	timeout = timer_start + tmout;
3087 3088
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3089 3090 3091 3092
		msleep(50);
		status = ata_chk_status(ap);
	}

3093 3094 3095
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
3096
	if (status & ATA_BUSY) {
3097
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
3098 3099
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
3100
		return -EBUSY;
L
Linus Torvalds 已提交
3101 3102 3103 3104 3105
	}

	return 0;
}

3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130
/**
 *	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;
3131
		if (!ata_link_online(&ap->link) && status == 0xff)
3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149
			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
3150 3151 3152 3153
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3154
	int rc, ret = 0;
L
Linus Torvalds 已提交
3155 3156 3157 3158

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3159 3160
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3161 3162 3163 3164 3165
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3166
	}
L
Linus Torvalds 已提交
3167

3168 3169
	/* 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
3170
	 */
3171 3172
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3173 3174

		ap->ops->dev_select(ap, 1);
3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189

		/* 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 */
		}

3190
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3191 3192 3193 3194 3195
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3196
	}
L
Linus Torvalds 已提交
3197 3198 3199 3200 3201 3202 3203

	/* 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);
3204

T
Tejun Heo 已提交
3205
	return ret;
L
Linus Torvalds 已提交
3206 3207
}

3208 3209
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3210 3211
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
3212 3213
	struct ata_device *dev;
	int i = 0;
L
Linus Torvalds 已提交
3214

T
Tejun Heo 已提交
3215
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3216 3217

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3218 3219 3220 3221 3222
	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
3223

3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
	/* 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
3243 3244 3245 3246 3247 3248 3249
	/* 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.
3250 3251
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3252 3253 3254
	 */
	msleep(150);

3255
	/* Before we perform post reset processing we want to see if
3256 3257 3258
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3259
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3260
		return -ENODEV;
3261

3262
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277
}

/**
 *	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
3278
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3279
 *	Obtains host lock.
L
Linus Torvalds 已提交
3280 3281
 *
 *	SIDE EFFECTS:
3282
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3283 3284 3285 3286
 */

void ata_bus_reset(struct ata_port *ap)
{
T
Tejun Heo 已提交
3287
	struct ata_device *device = ap->link.device;
L
Linus Torvalds 已提交
3288 3289 3290
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3291
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3292
	int rc;
L
Linus Torvalds 已提交
3293

T
Tejun Heo 已提交
3294
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313

	/* 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
3314 3315 3316
	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
3317
			goto err_out;
T
Tejun Heo 已提交
3318
	}
L
Linus Torvalds 已提交
3319 3320 3321 3322

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3323
	device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
L
Linus Torvalds 已提交
3324
	if ((slave_possible) && (err != 0x81))
3325
		device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
L
Linus Torvalds 已提交
3326 3327

	/* is double-select really necessary? */
T
Tejun Heo 已提交
3328
	if (device[1].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3329
		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3330
	if (device[0].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3331 3332 3333
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
T
Tejun Heo 已提交
3334 3335
	if ((device[0].class == ATA_DEV_NONE) &&
	    (device[1].class == ATA_DEV_NONE))
L
Linus Torvalds 已提交
3336 3337 3338 3339
		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
3340
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3341 3342 3343 3344 3345 3346
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3347
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
3348
	ata_port_disable(ap);
L
Linus Torvalds 已提交
3349 3350 3351 3352

	DPRINTK("EXIT\n");
}

3353
/**
3354 3355
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3356
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3357
 *	@deadline: deadline jiffies for the operation
3358
 *
3359
*	Make sure SStatus of @link reaches stable state, determined by
3360 3361
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3362 3363
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3364 3365
 *	until timeout then returns 0 if DET is stable at 1.
 *
3366 3367 3368
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3369 3370 3371 3372 3373 3374
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3375 3376
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3377
{
3378
	unsigned long interval_msec = params[0];
3379 3380
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3381 3382 3383
	u32 last, cur;
	int rc;

3384 3385 3386 3387
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3388
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3389 3390 3391 3392 3393 3394 3395 3396
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3397
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3398 3399 3400 3401 3402
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3403
			if (cur == 1 && time_before(jiffies, deadline))
3404 3405 3406 3407 3408 3409 3410 3411 3412 3413
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3414 3415 3416
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3417
		if (time_after(jiffies, deadline))
3418
			return -EPIPE;
3419 3420 3421 3422
	}
}

/**
3423 3424
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3425
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3426
 *	@deadline: deadline jiffies for the operation
3427
 *
3428
 *	Resume SATA phy @link and debounce it.
3429 3430 3431 3432 3433 3434 3435
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3436 3437
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3438 3439
{
	u32 scontrol;
3440 3441
	int rc;

3442
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3443
		return rc;
3444

3445
	scontrol = (scontrol & 0x0f0) | 0x300;
3446

3447
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3448
		return rc;
3449

3450 3451 3452 3453
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3454

3455
	return sata_link_debounce(link, params, deadline);
3456 3457
}

3458 3459
/**
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3460
 *	@link: ATA link to be reset
3461
 *	@deadline: deadline jiffies for the operation
3462
 *
T
Tejun Heo 已提交
3463
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3464 3465 3466 3467
 *	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.
3468 3469 3470 3471 3472 3473 3474
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3475
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3476
{
T
Tejun Heo 已提交
3477
	struct ata_port *ap = link->ap;
3478
	struct ata_eh_context *ehc = &link->eh_context;
3479
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3480 3481
	int rc;

T
Tejun Heo 已提交
3482
	/* handle link resume */
3483
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3484
	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3485 3486
		ehc->i.action |= ATA_EH_HARDRESET;

3487 3488 3489 3490 3491 3492
	/* 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;

3493 3494 3495 3496
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3497
	/* if SATA, resume link */
3498
	if (ap->flags & ATA_FLAG_SATA) {
3499
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3500 3501
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3502
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3503 3504 3505 3506 3507 3508
					"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.
	 */
3509
	if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
T
Tejun Heo 已提交
3510
		rc = ata_wait_ready(ap, deadline);
3511
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3512
			ata_link_printk(link, KERN_WARNING, "device not ready "
T
Tejun Heo 已提交
3513 3514 3515 3516
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3517 3518 3519 3520

	return 0;
}

3521 3522
/**
 *	ata_std_softreset - reset host port via ATA SRST
T
Tejun Heo 已提交
3523
 *	@link: ATA link to reset
3524
 *	@classes: resulting classes of attached devices
3525
 *	@deadline: deadline jiffies for the operation
3526
 *
3527
 *	Reset host port using ATA SRST.
3528 3529 3530 3531 3532 3533 3534
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3535
int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3536
		      unsigned long deadline)
3537
{
T
Tejun Heo 已提交
3538
	struct ata_port *ap = link->ap;
3539
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3540 3541
	unsigned int devmask = 0;
	int rc;
3542 3543 3544 3545
	u8 err;

	DPRINTK("ENTER\n");

3546
	if (ata_link_offline(link)) {
3547 3548 3549 3550
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561
	/* 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);
3562
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3563
	/* if link is occupied, -ENODEV too is an error */
3564
	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
T
Tejun Heo 已提交
3565
		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3566
		return rc;
3567 3568 3569
	}

	/* determine by signature whether we have ATA or ATAPI devices */
3570 3571
	classes[0] = ata_dev_try_classify(&link->device[0],
					  devmask & (1 << 0), &err);
3572
	if (slave_possible && err != 0x81)
3573 3574
		classes[1] = ata_dev_try_classify(&link->device[1],
						  devmask & (1 << 1), &err);
3575

3576
 out:
3577 3578 3579 3580 3581
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
T
Tejun Heo 已提交
3582 3583
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
3584
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3585
 *	@deadline: deadline jiffies for the operation
3586
 *
T
Tejun Heo 已提交
3587
 *	SATA phy-reset @link using DET bits of SControl register.
3588 3589 3590 3591 3592 3593 3594
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3595
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3596
			unsigned long deadline)
3597
{
3598
	u32 scontrol;
3599
	int rc;
3600

3601 3602
	DPRINTK("ENTER\n");

3603
	if (sata_set_spd_needed(link)) {
3604 3605 3606 3607 3608
		/* 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.
		 */
3609
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3610
			goto out;
3611

3612
		scontrol = (scontrol & 0x0f0) | 0x304;
3613

3614
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3615
			goto out;
3616

3617
		sata_set_spd(link);
3618 3619 3620
	}

	/* issue phy wake/reset */
3621
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3622
		goto out;
3623

3624
	scontrol = (scontrol & 0x0f0) | 0x301;
3625

3626
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3627
		goto out;
3628

3629
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3630 3631 3632 3633
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3634 3635
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3636 3637 3638 3639 3640 3641 3642
 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
3643
 *	@link: link to reset
3644
 *	@class: resulting class of attached device
3645
 *	@deadline: deadline jiffies for the operation
3646 3647 3648 3649 3650 3651 3652 3653 3654 3655
 *
 *	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
3656
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3657
		       unsigned long deadline)
3658
{
T
Tejun Heo 已提交
3659
	struct ata_port *ap = link->ap;
3660
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3661 3662 3663 3664 3665
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
T
Tejun Heo 已提交
3666
	rc = sata_link_hardreset(link, timing, deadline);
3667
	if (rc) {
T
Tejun Heo 已提交
3668
		ata_link_printk(link, KERN_ERR,
3669 3670 3671
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3672 3673

	/* TODO: phy layer with polling, timeouts, etc. */
3674
	if (ata_link_offline(link)) {
3675 3676 3677 3678 3679
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3680 3681 3682
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3683 3684 3685 3686 3687 3688 3689 3690 3691 3692
	/* 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;
	}

3693
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3694 3695
	/* link occupied, -ENODEV too is an error */
	if (rc) {
T
Tejun Heo 已提交
3696
		ata_link_printk(link, KERN_ERR,
3697 3698
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3699 3700
	}

3701 3702
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3703
	*class = ata_dev_try_classify(link->device, 1, NULL);
3704 3705 3706 3707 3708 3709 3710

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

/**
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3711
 *	@link: the target ata_link
3712 3713 3714 3715 3716 3717 3718 3719 3720
 *	@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
3721
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3722
{
T
Tejun Heo 已提交
3723
	struct ata_port *ap = link->ap;
3724 3725
	u32 serror;

3726 3727 3728
	DPRINTK("ENTER\n");

	/* print link status */
3729
	sata_print_link_status(link);
3730

3731
	/* clear SError */
3732 3733
	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
		sata_scr_write(link, SCR_ERROR, serror);
3734

3735 3736 3737 3738 3739 3740
	/* 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);

3741 3742 3743 3744 3745 3746 3747
	/* 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
3748 3749
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3750 3751 3752 3753

	DPRINTK("EXIT\n");
}

3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769
/**
 *	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
3770 3771
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3772 3773
{
	const u16 *old_id = dev->id;
3774 3775
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3776 3777

	if (dev->class != new_class) {
3778 3779
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3780 3781 3782
		return 0;
	}

3783 3784 3785 3786
	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]));
3787 3788

	if (strcmp(model[0], model[1])) {
3789 3790
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3791 3792 3793 3794
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3795 3796
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3797 3798 3799 3800 3801 3802 3803
		return 0;
	}

	return 1;
}

/**
3804
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3805
 *	@dev: target ATA device
3806
 *	@readid_flags: read ID flags
3807 3808 3809 3810 3811 3812 3813 3814 3815 3816
 *
 *	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
 */
3817
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3818
{
3819
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3820
	u16 *id = (void *)dev->link->ap->sector_buf;
3821 3822
	int rc;

3823
	/* read ID data */
3824
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3825
	if (rc)
3826
		return rc;
3827 3828

	/* is the device still there? */
3829 3830
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3831

3832
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3833 3834 3835 3836 3837 3838
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3839
 *	@new_class: new class code
3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850
 *	@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
 */
3851 3852
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3853
{
3854
	u64 n_sectors = dev->n_sectors;
3855 3856 3857 3858 3859
	int rc;

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

3860 3861 3862 3863 3864 3865 3866 3867 3868
	/* 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;
	}

3869 3870 3871 3872
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3873 3874

	/* configure device according to the new ID */
3875
	rc = ata_dev_configure(dev);
3876 3877 3878 3879
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
3880 3881
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
3882 3883 3884 3885
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
3886 3887 3888 3889

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

3890 3891 3892 3893 3894
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3895 3896

 fail:
3897
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3898 3899 3900
	return rc;
}

3901 3902 3903 3904 3905 3906 3907 3908 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
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 },
3938
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3939
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3940 3941
	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
				NULL,		ATA_HORKAGE_NODMA },
3942 3943 3944
	/* Odd clown on sil3726/4726 PMPs */
	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
						ATA_HORKAGE_SKIP_PM },
3945

3946
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3947
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3948

3949 3950 3951 3952 3953
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3954 3955
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3956
	/* NCQ is broken */
3957
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3958
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
3959 3960
	{ "HITACHI HDS7250SASUN500G*", NULL,    ATA_HORKAGE_NONCQ },
	{ "HITACHI HDS7225SBSUN250G*", NULL,    ATA_HORKAGE_NONCQ },
3961
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
3962

3963 3964 3965 3966 3967
	/* 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, },
3968 3969
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3970
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3971
	{ "HDT722516DLA380",	"V43OA96A",	ATA_HORKAGE_NONCQ, },
3972
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3973
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3974
	{ "WDC WD3200AAJS-00RYA0", "12.01B01",	ATA_HORKAGE_NONCQ, },
3975
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
3976
	{ "ST9120822AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3977
	{ "ST9160821AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3978 3979
	{ "ST3160812AS",	"3.ADJ",	ATA_HORKAGE_NONCQ, },
	{ "ST980813AS",		"3.ADB",	ATA_HORKAGE_NONCQ, },
3980
	{ "SAMSUNG HD401LJ",	"ZZ100-15",	ATA_HORKAGE_NONCQ, },
3981

3982 3983 3984 3985 3986
	/* 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 },
3987

3988 3989 3990 3991
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },

3992 3993
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3994
};
3995

3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012
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
4013
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4014
{
T
Tejun Heo 已提交
4015 4016
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4017
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4018

T
Tejun Heo 已提交
4019 4020
	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
4021

4022
	while (ad->model_num) {
4023
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4024 4025
			if (ad->model_rev == NULL)
				return ad->horkage;
4026
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4027
				return ad->horkage;
4028
		}
4029
		ad++;
4030
	}
L
Linus Torvalds 已提交
4031 4032 4033
	return 0;
}

4034 4035 4036 4037 4038 4039
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
4040
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4041 4042
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4043
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4044 4045
}

4046 4047 4048 4049
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4050 4051 4052 4053
 *	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...
4054 4055 4056 4057
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4058
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4059
{
T
Tejun Heo 已提交
4060 4061
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4062
	struct ata_host *host = ap->host;
4063
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4064

4065
	/* controller modes available */
4066 4067 4068
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4069
	/* drive modes available */
4070 4071 4072
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4073

4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084
	/*
	 *	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));
	}

4085 4086
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4087 4088
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4089
	}
4090

4091 4092
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
4093 4094 4095
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4096
	}
4097

J
Jeff Garzik 已提交
4098 4099 4100
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4101
	if (ap->ops->mode_filter)
4102
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4103

4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122
	/* 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);
		}

4123 4124
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4125 4126 4127 4128 4129 4130
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4131 4132 4133
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4134
 *	LOCKING:
J
Jeff Garzik 已提交
4135
 *	PCI/etc. bus probe sem.
4136 4137 4138
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4139 4140
 */

T
Tejun Heo 已提交
4141
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4142
{
4143
	struct ata_taskfile tf;
4144
	unsigned int err_mask;
L
Linus Torvalds 已提交
4145 4146 4147 4148

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

T
Tejun Heo 已提交
4149 4150 4151
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4152
	ata_tf_init(dev, &tf);
4153 4154
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4155
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4156 4157
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
4158

T
Tejun Heo 已提交
4159
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195

	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;

	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
4196

4197 4198
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4199 4200
}

4201 4202 4203
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4204 4205
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4206 4207
 *
 *	LOCKING:
4208 4209 4210 4211
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4212
 */
T
Tejun Heo 已提交
4213 4214
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4215
{
4216
	struct ata_taskfile tf;
4217
	unsigned int err_mask;
4218 4219 4220

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4221
		return AC_ERR_INVALID;
4222 4223 4224 4225

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

T
Tejun Heo 已提交
4226
	ata_tf_init(dev, &tf);
4227 4228 4229 4230 4231
	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 */
4232

T
Tejun Heo 已提交
4233
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4234 4235 4236 4237 4238
	/* 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;
4239

4240 4241
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4242 4243
}

L
Linus Torvalds 已提交
4244
/**
J
Jeff Garzik 已提交
4245 4246 4247 4248
 *	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
4249 4250
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4251
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4252
 */
4253
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4254 4255
{
	struct ata_port *ap = qc->ap;
4256
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4257
	int dir = qc->dma_dir;
4258
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4259

4260 4261
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4262 4263

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4264
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4265

J
Jeff Garzik 已提交
4266
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4267

4268 4269 4270 4271 4272 4273 4274 4275
	/* 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) {
4276
		if (qc->n_elem)
4277
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4278 4279 4280 4281 4282 4283
		/* 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);
4284
			kunmap_atomic(addr, KM_IRQ0);
4285 4286
		}
	} else {
4287
		if (qc->n_elem)
4288
			dma_unmap_single(ap->dev,
4289 4290
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4291 4292 4293 4294 4295 4296
		/* 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
4297 4298

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4299
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4300 4301 4302 4303 4304 4305
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4306 4307 4308
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4309
 *	LOCKING:
J
Jeff Garzik 已提交
4310
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4311 4312 4313 4314 4315
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4316 4317
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4318

4319
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4320
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4321 4322

	idx = 0;
4323
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352
		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);
}
4353

4354 4355 4356 4357 4358 4359 4360 4361 4362 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
/**
 *	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
4416 4417 4418 4419
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4420 4421 4422 4423
 *	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
4424
 *	LOCKING:
J
Jeff Garzik 已提交
4425
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4426
 *
L
Linus Torvalds 已提交
4427 4428 4429 4430 4431 4432
 *	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;
4433 4434 4435 4436 4437 4438

	/* 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;
4439

L
Linus Torvalds 已提交
4440
	if (ap->ops->check_atapi_dma)
4441
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4442

4443
	return 0;
L
Linus Torvalds 已提交
4444
}
4445

4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475
/**
 *	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
4476 4477 4478 4479
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4480 4481
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4482
 *	LOCKING:
J
Jeff Garzik 已提交
4483
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4484 4485 4486 4487 4488 4489 4490 4491 4492
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509
/**
 *	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);
}

4510 4511
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4512 4513 4514 4515 4516 4517 4518 4519 4520 4521
/**
 *	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
4522
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4523 4524
 */

L
Linus Torvalds 已提交
4525 4526 4527 4528
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4529
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4530
	qc->n_elem = 1;
4531
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4532
	qc->buf_virt = buf;
4533
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4534

4535
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4536 4537
}

J
Jeff Garzik 已提交
4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548
/**
 *	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
4549
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4550 4551
 */

L
Linus Torvalds 已提交
4552 4553 4554 4555
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4556
	qc->__sg = sg;
L
Linus Torvalds 已提交
4557
	qc->n_elem = n_elem;
4558
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4559 4560 4561
}

/**
J
Jeff Garzik 已提交
4562 4563 4564 4565
 *	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
4566 4567
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4568
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4569 4570
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4571
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4572 4573 4574 4575 4576 4577
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4578
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4579
	dma_addr_t dma_address;
4580
	int trim_sg = 0;
L
Linus Torvalds 已提交
4581

4582 4583 4584 4585 4586 4587
	/* 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;

4588
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599

		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;
4600 4601
		if (sg->length == 0)
			trim_sg = 1;
4602 4603 4604 4605 4606

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

4607 4608
	if (trim_sg) {
		qc->n_elem--;
4609 4610 4611
		goto skip_map;
	}

4612
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4613
				     sg->length, dir);
4614 4615 4616
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4617
		return -1;
4618
	}
L
Linus Torvalds 已提交
4619 4620

	sg_dma_address(sg) = dma_address;
4621
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4622

4623
skip_map:
L
Linus Torvalds 已提交
4624 4625 4626 4627 4628 4629 4630
	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
4631 4632 4633 4634
 *	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
4635 4636
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4637
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4638 4639
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4640
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4641 4642 4643 4644 4645 4646
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4647 4648
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4649
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4650

T
Tejun Heo 已提交
4651
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4652
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4653

4654 4655 4656 4657 4658 4659 4660
	/* 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;

4661
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675

		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);
4676
			kunmap_atomic(addr, KM_IRQ0);
4677 4678 4679 4680 4681 4682
		}

		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;
4683 4684
		if (lsg->length == 0)
			trim_sg = 1;
4685 4686 4687 4688 4689

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

4690 4691 4692 4693 4694 4695 4696 4697 4698
	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
4699
	dir = qc->dma_dir;
4700
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4701 4702 4703
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4704
		return -1;
4705
	}
L
Linus Torvalds 已提交
4706 4707 4708

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

4709
skip_map:
L
Linus Torvalds 已提交
4710 4711 4712 4713 4714
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4715
/**
4716
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4717 4718 4719 4720 4721 4722 4723 4724
 *	@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
4725
 *	Inherited from caller.
E
Edward Falk 已提交
4726
 */
L
Linus Torvalds 已提交
4727 4728 4729 4730 4731 4732 4733 4734 4735 4736
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
4737
/**
T
Tejun Heo 已提交
4738
 *	ata_data_xfer - Transfer data by PIO
4739
 *	@adev: device to target
A
Albert Lee 已提交
4740 4741
 *	@buf: data buffer
 *	@buflen: buffer length
4742
 *	@write_data: read/write
A
Albert Lee 已提交
4743 4744 4745 4746 4747 4748
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4749 4750
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4751
{
T
Tejun Heo 已提交
4752
	struct ata_port *ap = adev->link->ap;
A
Albert Lee 已提交
4753
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4754

A
Albert Lee 已提交
4755
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4756
	if (write_data)
T
Tejun Heo 已提交
4757
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4758
	else
T
Tejun Heo 已提交
4759
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4760 4761 4762 4763 4764 4765 4766 4767

	/* 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
4768
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4769
		} else {
T
Tejun Heo 已提交
4770
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4771 4772 4773
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4774 4775
}

4776
/**
T
Tejun Heo 已提交
4777
 *	ata_data_xfer_noirq - Transfer data by PIO
4778 4779 4780 4781 4782
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4783
 *	Transfer data from/to the device data register by PIO. Do the
4784 4785 4786 4787 4788
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4789 4790
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4791 4792 4793
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4794
	ata_data_xfer(adev, buf, buflen, write_data);
4795 4796 4797 4798
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4799
/**
4800
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4801 4802
 *	@qc: Command on going
 *
4803
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4804 4805 4806 4807 4808
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4809 4810 4811
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4812
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4813 4814 4815 4816 4817
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4818
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4819
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4820 4821

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4822
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4823 4824 4825 4826 4827 4828 4829

	/* 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");

4830 4831 4832
	if (PageHighMem(page)) {
		unsigned long flags;

4833
		/* FIXME: use a bounce buffer */
4834 4835
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4836

4837
		/* do the actual data transfer */
4838
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4839

4840 4841 4842 4843
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4844
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4845
	}
L
Linus Torvalds 已提交
4846

4847 4848
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4849

T
Tejun Heo 已提交
4850
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4851 4852 4853 4854 4855
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4856
/**
4857
 *	ata_pio_sectors - Transfer one or many sectors.
4858 4859
 *	@qc: Command on going
 *
4860
 *	Transfer one or many sectors of data from/to the
4861 4862 4863 4864 4865
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4866

4867 4868 4869 4870 4871 4872
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
4873
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4874

4875
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4876
			    qc->dev->multi_count);
4877 4878 4879 4880
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
4881 4882

	ata_altstatus(qc->ap); /* flush */
4883 4884
}

4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900
/**
 *	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");
4901
	WARN_ON(qc->dev->cdb_len < 12);
4902

4903
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918
	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
4919 4920
}

A
Albert Lee 已提交
4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932
/**
 *	__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
4933 4934 4935
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4936
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4937 4938 4939 4940 4941
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4942
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4943
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4944 4945

next_sg:
4946
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4947
		/*
4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958
		 * 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 */
4959 4960
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4961 4962

		for (i = 0; i < words; i++)
4963
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4964

A
Albert Lee 已提交
4965
		ap->hsm_task_state = HSM_ST_LAST;
4966 4967 4968
		return;
	}

4969
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4970 4971 4972 4973 4974 4975 4976 4977

	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;

4978
	/* don't overrun current sg */
4979
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4980 4981 4982 4983

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

4984 4985
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4986 4987 4988
	if (PageHighMem(page)) {
		unsigned long flags;

4989
		/* FIXME: use bounce buffer */
4990 4991
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4992

4993
		/* do the actual data transfer */
4994
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4995

4996 4997 4998 4999
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
5000
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
5001
	}
L
Linus Torvalds 已提交
5002 5003 5004 5005 5006

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

5007
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
5008 5009 5010 5011
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

5012
	if (bytes)
L
Linus Torvalds 已提交
5013 5014 5015
		goto next_sg;
}

A
Albert Lee 已提交
5016 5017 5018 5019 5020 5021 5022 5023 5024 5025
/**
 *	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
5026 5027 5028 5029 5030 5031 5032
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;

5033 5034 5035 5036 5037 5038 5039 5040 5041 5042
	/* 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
5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053
	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
5054
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5055

L
Linus Torvalds 已提交
5056
	__atapi_pio_bytes(qc, bytes);
5057
	ata_altstatus(ap); /* flush */
L
Linus Torvalds 已提交
5058 5059 5060 5061

	return;

err_out:
5062
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
5063
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
5064
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
5065 5066 5067
}

/**
5068 5069 5070
 *	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
5071
 *
5072 5073
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
5074
 */
5075 5076

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5077
{
5078 5079
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
5080

5081 5082 5083 5084
	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
5085

5086 5087 5088
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
5089 5090
	}

5091 5092
	return 0;
}
L
Linus Torvalds 已提交
5093

T
Tejun Heo 已提交
5094 5095 5096 5097 5098 5099 5100 5101
/**
 *	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
5102
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
5103 5104 5105 5106 5107 5108 5109 5110 5111
 *	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) {
5112
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
5113

J
Jeff Garzik 已提交
5114 5115
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
5116 5117 5118 5119
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5120
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5121 5122 5123 5124 5125
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

5126
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5127 5128 5129 5130 5131 5132 5133 5134
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
5135
			spin_lock_irqsave(ap->lock, flags);
5136
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5137
			ata_qc_complete(qc);
5138
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5139 5140 5141 5142 5143
		} else
			ata_qc_complete(qc);
	}
}

5144 5145 5146 5147 5148 5149 5150 5151 5152 5153
/**
 *	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.
 */
5154 5155
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
5156
{
5157 5158 5159
	unsigned long flags = 0;
	int poll_next;

5160 5161
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

5162 5163 5164 5165
	/* 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).
	 */
5166
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5167

5168
fsm_start:
5169
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
5170
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5171

5172 5173
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5174 5175 5176 5177 5178 5179 5180 5181
		/* 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);

5182
		/* check device status */
5183 5184 5185 5186 5187 5188 5189 5190 5191
		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
5192
			ap->hsm_task_state = HSM_ST_ERR;
5193
			goto fsm_start;
L
Linus Torvalds 已提交
5194 5195
		}

5196 5197
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
5198 5199 5200
		 * 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.
5201 5202
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5203 5204
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
5205
			qc->err_mask |= AC_ERR_HSM;
5206 5207
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
5208
		}
L
Linus Torvalds 已提交
5209

5210 5211 5212 5213 5214 5215
		/* 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)
5216
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
5217

5218 5219 5220 5221
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
5222

5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233
			/* 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)
5234
			spin_unlock_irqrestore(ap->lock, flags);
5235 5236 5237 5238

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
5239
		break;
5240

5241 5242 5243 5244 5245
	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) {
5246 5247 5248
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
5249 5250 5251
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5252

5253 5254
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
5255 5256 5257
			 * 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.
5258 5259
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5260 5261 5262
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
5263
				qc->err_mask |= AC_ERR_HSM;
5264 5265
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5266
			}
L
Linus Torvalds 已提交
5267

5268
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
5269

5270 5271 5272
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
5273

5274 5275 5276 5277
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
5278 5279 5280 5281
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
5282 5283 5284 5285 5286 5287
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
5288

5289 5290 5291
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5292

5293 5294 5295 5296 5297 5298 5299 5300 5301
			/* 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.
5302 5303 5304 5305
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5306 5307 5308 5309 5310 5311

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

5312 5313 5314
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5315 5316 5317 5318 5319 5320
				/* 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;
5321 5322
			}

5323 5324 5325 5326 5327
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
5328
				status = ata_wait_idle(ap);
5329 5330 5331 5332
				goto fsm_start;
			}
		}

5333
		poll_next = 1;
L
Linus Torvalds 已提交
5334 5335
		break;

A
Albert Lee 已提交
5336
	case HSM_ST_LAST:
5337 5338
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5339 5340 5341 5342 5343
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5344
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5345
			ap->print_id, qc->dev->devno, status);
5346

5347 5348
		WARN_ON(qc->err_mask);

5349
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5350

5351
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5352
		ata_hsm_qc_complete(qc, in_wq);
5353 5354

		poll_next = 0;
L
Linus Torvalds 已提交
5355 5356
		break;

A
Albert Lee 已提交
5357
	case HSM_ST_ERR:
5358 5359 5360 5361 5362 5363
		/* 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;
5364

5365
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5366
		ata_hsm_qc_complete(qc, in_wq);
5367 5368

		poll_next = 0;
5369 5370
		break;
	default:
5371
		poll_next = 0;
5372
		BUG();
L
Linus Torvalds 已提交
5373 5374
	}

5375
	return poll_next;
L
Linus Torvalds 已提交
5376 5377
}

5378
static void ata_pio_task(struct work_struct *work)
5379
{
5380 5381 5382
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5383
	u8 status;
5384
	int poll_next;
5385

J
Jeff Garzik 已提交
5386
fsm_start:
5387
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5388

5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400
	/*
	 * 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) {
5401
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5402 5403
			return;
		}
5404 5405
	}

5406 5407
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5408

5409 5410 5411 5412
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5413
		goto fsm_start;
5414 5415
}

L
Linus Torvalds 已提交
5416 5417 5418 5419 5420 5421
/**
 *	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
5422
 *	None.
L
Linus Torvalds 已提交
5423 5424 5425 5426 5427 5428 5429
 */

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

5430
	/* no command while frozen */
5431
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5432 5433
		return NULL;

5434 5435
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5436
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5437
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451
			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
5452
 *	None.
L
Linus Torvalds 已提交
5453 5454
 */

T
Tejun Heo 已提交
5455
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5456
{
T
Tejun Heo 已提交
5457
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
5458 5459 5460 5461 5462 5463 5464 5465
	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
5466
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479
	}

	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
5480
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5481 5482 5483
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5484 5485 5486
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5487
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5488

5489 5490 5491 5492
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5493
		clear_bit(tag, &ap->qc_allocated);
5494
	}
L
Linus Torvalds 已提交
5495 5496
}

5497
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5498
{
5499
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5500
	struct ata_link *link = qc->dev->link;
5501

5502 5503
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5504 5505 5506 5507

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

5508
	/* command should be marked inactive atomically with qc completion */
5509
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5510
		link->sactive &= ~(1 << qc->tag);
5511 5512 5513
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
5514
		link->active_tag = ATA_TAG_POISON;
5515 5516 5517 5518 5519 5520 5521
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
5522

5523 5524 5525 5526 5527
	/* 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;
5528
	ap->qc_active &= ~(1 << qc->tag);
5529

L
Linus Torvalds 已提交
5530
	/* call completion callback */
5531
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5532 5533
}

5534 5535 5536 5537 5538
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5539
	ap->ops->tf_read(ap, &qc->result_tf);
5540 5541
}

5542 5543 5544 5545 5546 5547 5548 5549 5550
/**
 *	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
5551
 *	spin_lock_irqsave(host lock)
5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570
 */
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) {
5571
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5572 5573 5574 5575 5576 5577 5578

		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 */
5579
				fill_result_tf(qc);
5580 5581 5582 5583 5584 5585 5586
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5587
			fill_result_tf(qc);
5588 5589 5590 5591 5592 5593 5594 5595

		__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)
5596
			fill_result_tf(qc);
5597 5598 5599 5600 5601

		__ata_qc_complete(qc);
	}
}

5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613
/**
 *	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
5614
 *	spin_lock_irqsave(host lock)
5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 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
 *
 *	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
5651 5652 5653 5654 5655
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5656
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684
	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
5685
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5686
 */
5687
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5688 5689
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5690
	struct ata_link *link = qc->dev->link;
L
Linus Torvalds 已提交
5691

5692 5693 5694 5695
	/* 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
5696
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5697 5698

	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5699
		WARN_ON(link->sactive & (1 << qc->tag));
5700 5701 5702

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5703
		link->sactive |= 1 << qc->tag;
5704
	} else {
T
Tejun Heo 已提交
5705
		WARN_ON(link->sactive);
5706 5707

		ap->nr_active_links++;
T
Tejun Heo 已提交
5708
		link->active_tag = qc->tag;
5709 5710
	}

5711
	qc->flags |= ATA_QCFLAG_ACTIVE;
5712
	ap->qc_active |= 1 << qc->tag;
5713

L
Linus Torvalds 已提交
5714 5715 5716
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5717
				goto sg_err;
L
Linus Torvalds 已提交
5718 5719
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5720
				goto sg_err;
L
Linus Torvalds 已提交
5721 5722 5723 5724 5725 5726 5727
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5728 5729 5730 5731
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5732

5733 5734
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5735 5736 5737
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748
}

/**
 *	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
5749 5750
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5751
 *	LOCKING:
J
Jeff Garzik 已提交
5752
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5753 5754
 *
 *	RETURNS:
5755
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5756 5757
 */

5758
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5759 5760 5761
{
	struct ata_port *ap = qc->ap;

5762 5763 5764 5765 5766 5767
	/* 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:
5768
		case ATA_PROT_NODATA:
5769 5770 5771 5772 5773 5774
		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)
5775
				/* see ata_dma_blacklisted() */
5776 5777 5778 5779 5780 5781 5782
				BUG();
			break;
		default:
			break;
		}
	}

5783
	/* select the device */
L
Linus Torvalds 已提交
5784 5785
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5786
	/* start the command */
L
Linus Torvalds 已提交
5787 5788
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5789 5790 5791
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5792
		ata_tf_to_host(ap, &qc->tf);
5793 5794 5795
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5796
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5797

L
Linus Torvalds 已提交
5798 5799 5800
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5801
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5802

L
Linus Torvalds 已提交
5803 5804 5805
		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 */
5806
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5807 5808
		break;

5809 5810 5811
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5812

J
Jeff Garzik 已提交
5813
		ata_tf_to_host(ap, &qc->tf);
5814

5815 5816 5817
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5818
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5819 5820

			/* always send first data block using
5821
			 * the ata_pio_task() codepath.
5822
			 */
5823
		} else {
5824 5825 5826 5827
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5828
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5829 5830 5831 5832

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5833 5834
		}

L
Linus Torvalds 已提交
5835 5836 5837 5838
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5839 5840 5841
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5842
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5843

5844 5845 5846 5847 5848
		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))
5849
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5850 5851 5852
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5853
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5854

L
Linus Torvalds 已提交
5855 5856
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5857 5858 5859 5860
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5861
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5862 5863 5864 5865
		break;

	default:
		WARN_ON(1);
5866
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881
	}

	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
5882
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5883 5884 5885 5886 5887 5888 5889 5890
 *
 *	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
5891
	struct ata_eh_info *ehi = &ap->link.eh_info;
5892
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5893

5894
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5895
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5896

5897 5898 5899
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5900 5901 5902
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5903

5904 5905 5906 5907 5908
		/* 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
5909 5910
			goto idle_irq;
		break;
5911 5912 5913 5914 5915
	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
5916 5917
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5918 5919 5920 5921 5922 5923 5924

			/* 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);
5925 5926 5927 5928 5929 5930

			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;
			}
5931 5932 5933 5934
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5935 5936 5937 5938
	default:
		goto idle_irq;
	}

5939 5940 5941 5942
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5943

5944 5945 5946 5947
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5948

5949 5950
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5951

5952
	ata_hsm_move(ap, qc, status, 0);
5953 5954 5955 5956 5957

	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
5958 5959 5960 5961 5962 5963 5964
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5965 5966
		ata_chk_status(ap);
		ap->ops->irq_clear(ap);
5967
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5968
		return 1;
L
Linus Torvalds 已提交
5969 5970 5971 5972 5973 5974 5975
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5976
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5977
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5978
 *
J
Jeff Garzik 已提交
5979 5980 5981
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5982
 *	LOCKING:
J
Jeff Garzik 已提交
5983
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5984 5985
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5986
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5987 5988
 */

5989
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5990
{
J
Jeff Garzik 已提交
5991
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5992 5993 5994 5995 5996
	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
5997
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5998

J
Jeff Garzik 已提交
5999
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
6000 6001
		struct ata_port *ap;

J
Jeff Garzik 已提交
6002
		ap = host->ports[i];
6003
		if (ap &&
J
Jeff Garzik 已提交
6004
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
6005 6006
			struct ata_queued_cmd *qc;

T
Tejun Heo 已提交
6007
			qc = ata_qc_from_tag(ap, ap->link.active_tag);
6008
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6009
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
6010 6011 6012 6013
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
6014
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
6015 6016 6017 6018

	return IRQ_RETVAL(handled);
}

6019 6020
/**
 *	sata_scr_valid - test whether SCRs are accessible
6021
 *	@link: ATA link to test SCR accessibility for
6022
 *
6023
 *	Test whether SCRs are accessible for @link.
6024 6025 6026 6027 6028 6029 6030
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
6031
int sata_scr_valid(struct ata_link *link)
6032
{
6033 6034
	struct ata_port *ap = link->ap;

6035
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6036 6037 6038 6039
}

/**
 *	sata_scr_read - read SCR register of the specified port
6040
 *	@link: ATA link to read SCR for
6041 6042 6043
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
6044
 *	Read SCR register @reg of @link into *@val.  This function is
6045 6046
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6047 6048
 *
 *	LOCKING:
6049
 *	None if @link is ap->link.  Kernel thread context otherwise.
6050 6051 6052 6053
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6054
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6055
{
6056 6057
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
6058

6059 6060 6061 6062 6063 6064
		if (sata_scr_valid(link))
			return ap->ops->scr_read(ap, reg, val);
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
6065 6066 6067 6068
}

/**
 *	sata_scr_write - write SCR register of the specified port
6069
 *	@link: ATA link to write SCR for
6070 6071 6072
 *	@reg: SCR to write
 *	@val: value to write
 *
6073
 *	Write @val to SCR register @reg of @link.  This function is
6074 6075
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6076 6077
 *
 *	LOCKING:
6078
 *	None if @link is ap->link.  Kernel thread context otherwise.
6079 6080 6081 6082
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6083
int sata_scr_write(struct ata_link *link, int reg, u32 val)
6084
{
6085 6086 6087 6088 6089 6090 6091
	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;
	}
6092

6093
	return sata_pmp_scr_write(link, reg, val);
6094 6095 6096 6097
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
6098
 *	@link: ATA link to write SCR for
6099 6100 6101 6102 6103 6104 6105
 *	@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:
6106
 *	None if @link is ap->link.  Kernel thread context otherwise.
6107 6108 6109 6110
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6111
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6112
{
6113 6114 6115
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
		int rc;
6116

6117 6118 6119 6120 6121 6122 6123
		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;
6124
	}
6125 6126

	return sata_pmp_scr_write(link, reg, val);
6127 6128 6129
}

/**
6130 6131
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
6132
 *
6133 6134 6135
 *	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).
6136 6137 6138 6139 6140 6141 6142
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
6143
int ata_link_online(struct ata_link *link)
6144 6145 6146
{
	u32 sstatus;

6147 6148
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
6149 6150 6151 6152 6153
		return 1;
	return 0;
}

/**
6154 6155
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
6156
 *
6157 6158 6159
 *	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).
6160 6161 6162 6163 6164 6165 6166
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
6167
int ata_link_offline(struct ata_link *link)
6168 6169 6170
{
	u32 sstatus;

6171 6172
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
6173 6174 6175
		return 1;
	return 0;
}
E
Edward Falk 已提交
6176

6177
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
6178
{
6179
	unsigned int err_mask;
J
Jens Axboe 已提交
6180 6181 6182 6183 6184
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

6185
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
6186 6187 6188 6189
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

6190 6191 6192 6193
	/* 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 */
6194 6195 6196 6197 6198 6199 6200
	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
6201 6202
}

6203
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6204 6205 6206
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
6207 6208 6209 6210
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
6211 6212
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6213
		struct ata_link *link;
6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232

		/* 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;
6233 6234 6235 6236
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254

		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
6255 6256
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
6257 6258
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
6259
 *	Suspend @host.  Actual operation is performed by EH.  This
6260 6261 6262 6263 6264 6265 6266 6267 6268
 *	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
6269
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6270
{
6271
	int rc;
6272

J
Jeff Garzik 已提交
6273
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6274 6275
	if (rc == 0)
		host->dev->power.power_state = mesg;
6276 6277 6278 6279
	return rc;
}

/**
J
Jeff Garzik 已提交
6280 6281
 *	ata_host_resume - resume host
 *	@host: host to resume
6282
 *
J
Jeff Garzik 已提交
6283
 *	Resume @host.  Actual operation is performed by EH.  This
6284 6285 6286 6287 6288 6289
 *	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
6290
void ata_host_resume(struct ata_host *host)
6291
{
J
Jeff Garzik 已提交
6292 6293 6294
	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;
6295
}
6296
#endif
6297

6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309
/**
 *	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.
 */
6310
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
6311
{
6312
	struct device *dev = ap->dev;
6313
	int rc;
L
Linus Torvalds 已提交
6314

6315 6316
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
6317 6318 6319
	if (!ap->prd)
		return -ENOMEM;

6320
	rc = ata_pad_alloc(ap, dev);
6321
	if (rc)
6322
		return rc;
L
Linus Torvalds 已提交
6323

6324 6325
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
6326 6327 6328
	return 0;
}

6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339
/**
 *	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
6340 6341
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
6342 6343
	unsigned long flags;

6344
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
6345 6346
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
6347

6348 6349
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6350
	 * host lock.
6351
	 */
6352
	spin_lock_irqsave(ap->lock, flags);
6353
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6354
	dev->horkage = 0;
6355
	spin_unlock_irqrestore(ap->lock, flags);
6356

6357 6358
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6359 6360 6361 6362 6363
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

6364 6365 6366 6367
/**
 *	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
6368
 *	@pmp: Port multiplier port number
6369 6370 6371 6372 6373 6374
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
6375
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6376 6377 6378 6379 6380 6381 6382
{
	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
6383
	link->pmp = pmp;
6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409
	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.
 */
6410
int sata_link_init_spd(struct ata_link *link)
6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427
{
	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
6428
/**
6429 6430
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6431
 *
6432 6433 6434 6435
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6436
 *
L
Linus Torvalds 已提交
6437
 *	LOCKING:
6438
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6439
 */
6440
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6441
{
6442
	struct ata_port *ap;
L
Linus Torvalds 已提交
6443

6444 6445 6446 6447 6448 6449
	DPRINTK("ENTER\n");

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

6450
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6451
	ap->lock = &host->lock;
6452
	ap->flags = ATA_FLAG_DISABLED;
6453
	ap->print_id = -1;
L
Linus Torvalds 已提交
6454
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6455
	ap->host = host;
6456
	ap->dev = host->dev;
L
Linus Torvalds 已提交
6457
	ap->last_ctl = 0xFF;
6458 6459 6460 6461 6462 6463

#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
6464
#else
6465
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6466
#endif
L
Linus Torvalds 已提交
6467

6468 6469 6470
	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);
6471
	INIT_LIST_HEAD(&ap->eh_done_q);
6472
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6473 6474 6475
	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
6476

6477 6478
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
6479
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
6480 6481 6482 6483 6484 6485 6486 6487

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

6488 6489 6490 6491 6492 6493 6494 6495
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];

6496 6497 6498 6499
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6500 6501 6502
			ap->ops->port_stop(ap);
	}

6503
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6504
		host->ops->host_stop(host);
6505

6506 6507 6508
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6509 6510 6511 6512
		if (!ap)
			continue;

		if (ap->scsi_host)
6513 6514
			scsi_host_put(ap->scsi_host);

6515
		kfree(ap->pmp_link);
6516
		kfree(ap);
6517 6518 6519
		host->ports[i] = NULL;
	}

6520
	dev_set_drvdata(gendev, NULL);
6521 6522
}

6523 6524 6525 6526 6527 6528 6529 6530 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
/**
 *	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;
}

6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 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
/**
 *	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;
6626
		ap->link.flags |= pi->link_flags;
6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637
		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;
}

6638 6639 6640 6641 6642 6643 6644
/**
 *	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
6645 6646
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663
 *
 *	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];

6664 6665 6666
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691
		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;
}

6692
/**
J
Jeff Garzik 已提交
6693 6694 6695 6696 6697
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6698 6699 6700 6701 6702
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6703
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6704 6705
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6706
{
J
Jeff Garzik 已提交
6707 6708 6709 6710
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6711 6712
}

6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755
/**
 *	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;

6756 6757 6758
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6759 6760 6761 6762 6763 6764 6765 6766 6767 6768
	/* 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 */
6769
		sata_link_init_spd(&ap->link);
6770

6771
		/* print per-port info to dmesg */
6772 6773 6774 6775
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

		if (!ata_port_is_dummy(ap))
6776 6777
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6778
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6779
					ata_mode_string(xfer_mask),
6780
					ap->link.eh_info.desc);
6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792
		else
			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
6793
			struct ata_eh_info *ehi = &ap->link.eh_info;
6794 6795 6796 6797 6798 6799 6800
			unsigned long flags;

			ata_port_probe(ap);

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

6801 6802
			ehi->probe_mask =
				(1 << ata_link_max_devices(&ap->link)) - 1;
6803 6804 6805
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

6806
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834
			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];

6835
		ata_scsi_scan_host(ap, 1);
6836 6837 6838 6839 6840
	}

	return 0;
}

6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863
/**
 *	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)
{
6864
	int i, rc;
6865 6866 6867 6868 6869 6870 6871 6872 6873 6874

	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;

6875 6876
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6877

6878 6879 6880 6881 6882 6883 6884 6885
	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;
}

6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899
/**
 *	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;
6900
	struct ata_link *link;
6901
	struct ata_device *dev;
6902 6903

	if (!ap->ops->error_handler)
6904
		goto skip_eh;
6905 6906

	/* tell EH we're leaving & flush EH */
6907
	spin_lock_irqsave(ap->lock, flags);
6908
	ap->pflags |= ATA_PFLAG_UNLOADING;
6909
	spin_unlock_irqrestore(ap->lock, flags);
6910 6911 6912 6913 6914 6915

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6916
	spin_lock_irqsave(ap->lock, flags);
6917

6918 6919 6920 6921
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
6922

6923
	spin_unlock_irqrestore(ap->lock, flags);
6924 6925 6926 6927 6928

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6929
	spin_lock_irqsave(ap->lock, flags);
6930
	ata_port_freeze(ap);	/* won't be thawed */
6931
	spin_unlock_irqrestore(ap->lock, flags);
6932 6933

	ata_port_wait_eh(ap);
6934
	cancel_rearming_delayed_work(&ap->hotplug_task);
6935

6936
 skip_eh:
6937
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6938
	scsi_remove_host(ap->scsi_host);
6939 6940
}

T
Tejun Heo 已提交
6941 6942 6943 6944 6945 6946 6947 6948 6949 6950 6951 6952 6953 6954 6955 6956 6957
/**
 *	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
6958 6959 6960
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6961 6962 6963 6964 6965 6966 6967
 *
 *	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
6968
 */
E
Edward Falk 已提交
6969

L
Linus Torvalds 已提交
6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983
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
6984

6985 6986
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6987 6988 6989 6990
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6991 6992 6993
 *	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
6994 6995 6996 6997
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6998
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6999 7000
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
7001
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
7002

T
Tejun Heo 已提交
7003
	ata_host_detach(host);
L
Linus Torvalds 已提交
7004 7005 7006
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
7007
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038
{
	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
7039

7040
#ifdef CONFIG_PM
7041
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
7042 7043
{
	pci_save_state(pdev);
7044
	pci_disable_device(pdev);
7045

7046
	if (mesg.event == PM_EVENT_SUSPEND)
7047
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
7048 7049
}

7050
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
7051
{
7052 7053
	int rc;

J
Jens Axboe 已提交
7054 7055
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
7056

T
Tejun Heo 已提交
7057
	rc = pcim_enable_device(pdev);
7058 7059 7060 7061 7062 7063
	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
7064
	pci_set_master(pdev);
7065
	return 0;
7066 7067
}

7068
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7069
{
J
Jeff Garzik 已提交
7070
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7071 7072
	int rc = 0;

J
Jeff Garzik 已提交
7073
	rc = ata_host_suspend(host, mesg);
7074 7075 7076
	if (rc)
		return rc;

7077
	ata_pci_device_do_suspend(pdev, mesg);
7078 7079 7080 7081 7082 7083

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
7084
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7085
	int rc;
7086

7087 7088 7089 7090
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
7091
}
7092 7093
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
7094 7095 7096 7097 7098
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
7099
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
7100 7101 7102 7103
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

7104 7105 7106 7107 7108 7109
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
7110 7111 7112 7113 7114 7115 7116
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
7117
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
7118 7119
}

7120
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
7121 7122
module_exit(ata_exit);

7123
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
7124
static DEFINE_SPINLOCK(ata_ratelimit_lock);
7125 7126 7127 7128 7129 7130 7131 7132 7133 7134 7135 7136 7137 7138 7139 7140 7141 7142 7143

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;
}

7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154 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
/**
 *	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
7190 7191 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 7217 7218 7219 7220 7221
/*
 * 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,
};

7222 7223 7224 7225
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
7226 7227 7228 7229 7230 7231 7232
/*
 * 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.
 */

7233 7234 7235
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
7236
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7237
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
7238 7239
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
7240
EXPORT_SYMBOL_GPL(ata_host_init);
7241
EXPORT_SYMBOL_GPL(ata_host_alloc);
7242
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7243
EXPORT_SYMBOL_GPL(ata_host_start);
7244
EXPORT_SYMBOL_GPL(ata_host_register);
7245
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
7246
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
7247 7248
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
7249
EXPORT_SYMBOL_GPL(ata_hsm_move);
7250
EXPORT_SYMBOL_GPL(ata_qc_complete);
7251
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
7252 7253 7254 7255 7256
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);
7257
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
7258 7259 7260 7261 7262 7263
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);
7264
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
7265
EXPORT_SYMBOL_GPL(ata_interrupt);
7266
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
7267 7268
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7269
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
L
Linus Torvalds 已提交
7270
EXPORT_SYMBOL_GPL(ata_qc_prep);
7271
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7272
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
7273 7274 7275 7276 7277
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);
7278 7279 7280 7281 7282
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
7283
EXPORT_SYMBOL_GPL(ata_port_probe);
7284
EXPORT_SYMBOL_GPL(ata_dev_disable);
7285
EXPORT_SYMBOL_GPL(sata_set_spd);
7286 7287
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
L
Linus Torvalds 已提交
7288 7289 7290
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
7291
EXPORT_SYMBOL_GPL(ata_std_prereset);
7292
EXPORT_SYMBOL_GPL(ata_std_softreset);
T
Tejun Heo 已提交
7293
EXPORT_SYMBOL_GPL(sata_link_hardreset);
7294 7295
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
7296 7297
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
7298
EXPORT_SYMBOL_GPL(ata_port_disable);
7299
EXPORT_SYMBOL_GPL(ata_ratelimit);
7300
EXPORT_SYMBOL_GPL(ata_wait_register);
7301
EXPORT_SYMBOL_GPL(ata_busy_sleep);
7302
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
7303
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
7304 7305 7306
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7307
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7308
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
7309
EXPORT_SYMBOL_GPL(ata_host_intr);
7310 7311 7312 7313
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);
7314 7315
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
7316
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
7317 7318
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
7319
#endif /* CONFIG_PM */
7320 7321
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
7322
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
L
Linus Torvalds 已提交
7323 7324
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

7325
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
7326 7327 7328
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
7329 7330
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
7331
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
T
Tejun Heo 已提交
7332
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7333
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
L
Linus Torvalds 已提交
7334 7335
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7336
#ifdef CONFIG_PM
7337 7338
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
7339 7340
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7341
#endif /* CONFIG_PM */
A
Alan Cox 已提交
7342 7343
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
7344
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
7345

7346
EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7347 7348 7349 7350 7351 7352 7353 7354
EXPORT_SYMBOL_GPL(sata_pmp_read_init_tf);
EXPORT_SYMBOL_GPL(sata_pmp_read_val);
EXPORT_SYMBOL_GPL(sata_pmp_write_init_tf);
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
7355 7356 7357
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7358 7359 7360 7361
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
7362
EXPORT_SYMBOL_GPL(ata_eng_timeout);
7363
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7364
EXPORT_SYMBOL_GPL(ata_link_abort);
7365
EXPORT_SYMBOL_GPL(ata_port_abort);
7366
EXPORT_SYMBOL_GPL(ata_port_freeze);
7367
EXPORT_SYMBOL_GPL(sata_async_notification);
7368 7369
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7370 7371
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
7372
EXPORT_SYMBOL_GPL(ata_do_eh);
7373
EXPORT_SYMBOL_GPL(ata_irq_on);
A
Akira Iguchi 已提交
7374
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
7375 7376 7377 7378 7379

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