libata-core.c 178.1 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 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 = 1;
module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in 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",
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		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
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	int highbit;
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	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>";
}

595 596 597 598 599 600 601 602 603 604 605 606
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)
608
{
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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");
612 613
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
614 615 616 617
		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:
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
 *	the event of failure.
 */

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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.
	 */

	if (((tf->lbam == 0) && (tf->lbah == 0)) ||
	    ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

	if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
	    ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

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

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
702 703
 *	@dev: ATA device to classify (starting at zero)
 *	@present: device seems present
704
 *	@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.
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 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */
721 722
unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
				  u8 *r_err)
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{
724
	struct ata_port *ap = dev->link->ap;
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	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

729
	ap->ops->dev_select(ap, dev->devno);
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	memset(&tf, 0, sizeof(tf));

	ap->ops->tf_read(ap, &tf);
734
	err = tf.feature;
735 736
	if (r_err)
		*r_err = err;
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738
	/* see if device passed diags: if master then continue and warn later */
739
	if (err == 0 && dev->devno == 0)
740
		/* diagnostic fail : do nothing _YET_ */
741
		dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
742
	else if (err == 1)
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		/* do nothing */ ;
744
	else if ((dev->devno == 0) && (err == 0x81))
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		/* do nothing */ ;
	else
747
		return ATA_DEV_NONE;
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749
	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
751

752 753 754 755 756 757 758 759 760 761 762 763 764 765
	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;

766
	return class;
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}

/**
770
 *	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.
 */

784 785
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;
	}
}

803
/**
804
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
805 806 807 808 809
 *	@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.
 *
810
 *	This function is identical to ata_id_string except that it
811 812 813 814 815 816
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
817 818
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
819 820 821 822 823
{
	unsigned char *p;

	WARN_ON(!(len & 1));

824
	ata_id_string(id, s, ofs, len - 1);
825 826 827 828 829 830

	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;
}

/**
874 875 876
 *	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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 *
878 879
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
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 *
881 882 883
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
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 */
885
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
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{
887
	unsigned int err_mask;
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	struct ata_taskfile tf;
889
	int lba48 = ata_id_has_lba48(dev->id);
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	ata_tf_init(dev, &tf);

893
	/* always clear all address registers */
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	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

896 897 898 899 900
	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;
903 904 905 906 907 908 909 910 911 912
	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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914 915 916 917
	if (lba48)
		*max_sectors = ata_tf_to_lba48(&tf);
	else
		*max_sectors = ata_tf_to_lba(&tf);
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919
	return 0;
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}

/**
923 924
 *	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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 *
927 928 929 930 931 932
 *	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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{
936
	unsigned int err_mask;
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	struct ata_taskfile tf;
938
	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;
945 946 947 948 949 950 951 952 953 954 955

	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;
	} else
		tf.command = ATA_CMD_SET_MAX;

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	tf.protocol |= ATA_PROT_NODATA;
957
	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;

963 964 965 966 967 968 969 970 971 972 973
	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)
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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;
993
	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))
999
		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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}

1072 1073 1074
/**
 *	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
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
 *
 *	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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1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
 *
 *	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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1155
	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)
{
T
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	if (ata_msg_probe(ap))
T
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1182 1183
		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
L
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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)
L
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1192 1193 1194 1195 1196 1197 1198
			msleep(150);
		ata_wait_idle(ap);
	}
}

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1199
 *	@id: IDENTIFY DEVICE page to dump
L
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 *
1201 1202
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
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1203 1204 1205 1206 1207
 *
 *	LOCKING:
 *	caller.
 */

1208
static inline void ata_dump_id(const u16 *id)
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1209 1210 1211 1212 1213 1214
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1215 1216 1217 1218 1219
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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1220 1221 1222 1223 1224
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1225 1226 1227 1228 1229
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
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1230 1231
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1232 1233
		id[88],
		id[93]);
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}

1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
/**
 *	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.
		 */
1265
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1266 1267 1268 1269
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279

		/* 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;
1280

1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
	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);
	}

1298 1299 1300
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1301 1302 1303 1304

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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1305 1306 1307
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1308
 *	@fn: workqueue function to be scheduled
1309
 *	@data: data for @fn to use
1310
 *	@delay: delay time for workqueue function
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1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
 *
 *	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.
 */
1324
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1325 1326
			 unsigned long delay)
{
1327 1328
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
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1329

1330 1331
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
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1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
}

/**
 *	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");

1348
	cancel_rearming_delayed_work(&ap->port_task);
T
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1349

1350 1351
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
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1352 1353
}

1354
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1355
{
1356
	struct completion *waiting = qc->private_data;
1357 1358 1359 1360 1361

	complete(waiting);
}

/**
1362
 *	ata_exec_internal_sg - execute libata internal command
1363 1364
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1365
 *	@cdb: CDB for packet command
1366
 *	@dma_dir: Data tranfer direction of the command
1367 1368
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1369 1370 1371 1372 1373 1374 1375 1376 1377
 *
 *	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.
1378 1379 1380
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1381
 */
1382 1383 1384 1385
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)
1386
{
T
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1387 1388
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1389 1390
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1391
	unsigned int tag, preempted_tag;
1392
	u32 preempted_sactive, preempted_qc_active;
1393
	DECLARE_COMPLETION_ONSTACK(wait);
1394
	unsigned long flags;
1395
	unsigned int err_mask;
1396
	int rc;
1397

1398
	spin_lock_irqsave(ap->lock, flags);
1399

1400
	/* no internal command while frozen */
1401
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1402
		spin_unlock_irqrestore(ap->lock, flags);
1403 1404 1405
		return AC_ERR_SYSTEM;
	}

1406
	/* initialize internal qc */
1407

1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
	/* 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;

1418
	if (test_and_set_bit(tag, &ap->qc_allocated))
1419
		BUG();
1420
	qc = __ata_qc_from_tag(ap, tag);
1421 1422 1423 1424 1425 1426 1427

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

T
Tejun Heo 已提交
1428 1429
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1430
	preempted_qc_active = ap->qc_active;
T
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1431 1432
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1433
	ap->qc_active = 0;
1434 1435

	/* prepare & issue qc */
1436
	qc->tf = *tf;
1437 1438
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1439
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1440 1441
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1442 1443 1444 1445 1446 1447
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1448
		qc->nbytes = buflen;
1449 1450
	}

1451
	qc->private_data = &wait;
1452 1453
	qc->complete_fn = ata_qc_complete_internal;

1454
	ata_qc_issue(qc);
1455

1456
	spin_unlock_irqrestore(ap->lock, flags);
1457

A
Andrew Morton 已提交
1458
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1459 1460

	ata_port_flush_task(ap);
1461

1462
	if (!rc) {
1463
		spin_lock_irqsave(ap->lock, flags);
1464 1465 1466

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1467 1468
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1469
		 */
1470
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1471 1472 1473 1474 1475 1476
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1477

1478 1479
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1480
					"qc timeout (cmd 0x%x)\n", command);
1481 1482
		}

1483
		spin_unlock_irqrestore(ap->lock, flags);
1484 1485
	}

1486 1487 1488 1489
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
	/* 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;
1500 1501
	}

1502
	/* finish up */
1503
	spin_lock_irqsave(ap->lock, flags);
1504

1505
	*tf = qc->result_tf;
1506 1507 1508
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
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1509 1510
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1511
	ap->qc_active = preempted_qc_active;
1512

1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
	/* 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.
	 */
1524
	if (ap->flags & ATA_FLAG_DISABLED) {
1525 1526 1527 1528
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1529
	spin_unlock_irqrestore(ap->lock, flags);
1530

1531
	return err_mask;
1532 1533
}

1534
/**
1535
 *	ata_exec_internal - execute libata internal command
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555
 *	@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)
{
1556 1557
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1558

1559 1560 1561 1562 1563 1564
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1565

1566
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1567 1568
}

1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
/**
 *	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
1582
 */
1583
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1584 1585 1586 1587 1588 1589 1590 1591 1592
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1593
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1594 1595
}

1596 1597 1598 1599 1600 1601 1602
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
J
Jeff Garzik 已提交
1603

1604 1605
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1606 1607
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1608
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1609
		return 0;
A
Alan Cox 已提交
1610 1611 1612 1613 1614
	/* 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))
1615
		return 1;
A
Alan Cox 已提交
1616 1617
	return 0;
}
1618

A
Alan Cox 已提交
1619 1620 1621 1622 1623 1624 1625
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
J
Jeff Garzik 已提交
1626

A
Alan Cox 已提交
1627 1628
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1629 1630
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1631
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1632 1633 1634 1635
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1636 1637
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1638 1639
		}
	}
A
Alan Cox 已提交
1640
	return 3 << ATA_SHIFT_PIO;
1641 1642
}

L
Linus Torvalds 已提交
1643
/**
1644 1645 1646
 *	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)
1647
 *	@flags: ATA_READID_* flags
1648
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1649
 *
1650 1651
 *	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
1652 1653
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1654
 *
1655 1656 1657
 *	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
1658
 *	LOCKING:
1659 1660 1661 1662
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1663
 */
1664
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1665
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1666
{
T
Tejun Heo 已提交
1667
	struct ata_port *ap = dev->link->ap;
1668
	unsigned int class = *p_class;
1669
	struct ata_taskfile tf;
1670 1671
	unsigned int err_mask = 0;
	const char *reason;
1672
	int may_fallback = 1, tried_spinup = 0;
1673
	int rc;
L
Linus Torvalds 已提交
1674

1675
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1676
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1677

1678 1679
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1680
	ata_tf_init(dev, &tf);
1681

1682 1683
	switch (class) {
	case ATA_DEV_ATA:
1684
		tf.command = ATA_CMD_ID_ATA;
1685 1686
		break;
	case ATA_DEV_ATAPI:
1687
		tf.command = ATA_CMD_ID_ATAPI;
1688 1689 1690 1691 1692
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1693 1694
	}

1695
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705

	/* 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
1706

T
Tejun Heo 已提交
1707
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1708
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1709
	if (err_mask) {
1710
		if (err_mask & AC_ERR_NODEV_HINT) {
1711
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1712
				ap->print_id, dev->devno);
1713 1714 1715
			return -ENOENT;
		}

1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730
		/* 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;
		}

1731 1732
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1733 1734 1735
		goto err_out;
	}

1736 1737 1738 1739 1740
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1741
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1742

1743
	/* sanity check */
1744
	rc = -EINVAL;
A
Alan Cox 已提交
1745
	reason = "device reports invalid type";
1746 1747 1748 1749 1750 1751 1752

	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;
1753 1754
	}

1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
	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);
1768
		if (err_mask && id[2] != 0x738c) {
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
			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;
	}

1781
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1782 1783 1784
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
1785 1786
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1787 1788
		 * anything else..
		 * Some drives were very specific about that exact sequence.
1789 1790 1791
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
1792 1793
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1794
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1795 1796 1797 1798 1799 1800 1801 1802 1803
			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.
			 */
1804
			flags &= ~ATA_READID_POSTRESET;
1805 1806 1807 1808 1809
			goto retry;
		}
	}

	*p_class = class;
1810

1811 1812 1813
	return 0;

 err_out:
T
Tejun Heo 已提交
1814
	if (ata_msg_warn(ap))
1815
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1816
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1817 1818 1819
	return rc;
}

T
Tejun Heo 已提交
1820
static inline u8 ata_dev_knobble(struct ata_device *dev)
1821
{
T
Tejun Heo 已提交
1822 1823
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1824 1825
}

1826 1827 1828
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
1829
	struct ata_port *ap = dev->link->ap;
1830 1831 1832 1833 1834 1835
	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
1836
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
1837 1838 1839
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1840
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1841
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1842 1843 1844 1845 1846 1847 1848 1849 1850
		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);
}

1851
/**
1852 1853 1854 1855 1856
 *	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.
1857 1858
 *
 *	LOCKING:
1859 1860 1861 1862
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1863
 */
1864
int ata_dev_configure(struct ata_device *dev)
1865
{
T
Tejun Heo 已提交
1866 1867
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
1868
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1869
	const u16 *id = dev->id;
1870
	unsigned int xfer_mask;
1871
	char revbuf[7];		/* XYZ-99\0 */
1872 1873
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1874
	int rc;
1875

1876
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1877 1878
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1879
		return 0;
1880 1881
	}

1882
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1883
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1884

T
Tejun Heo 已提交
1885 1886 1887
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
1888 1889 1890 1891
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1892

T
Tejun Heo 已提交
1893 1894 1895 1896 1897
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

1898
	/* print device capabilities */
1899
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1900 1901 1902
		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",
1903
			       __FUNCTION__,
1904 1905
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1906

1907
	/* initialize to-be-configured parameters */
1908
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1909 1910 1911 1912 1913 1914 1915
	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
1916 1917 1918 1919
	/*
	 * common ATA, ATAPI feature tests
	 */

1920
	/* find max transfer mode; for printk only */
1921
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1922

1923 1924
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1925

1926 1927 1928 1929 1930 1931 1932
	/* 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
1933 1934
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1935 1936
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1937 1938 1939
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1940 1941 1942 1943 1944
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1945
		dev->n_sectors = ata_id_n_sectors(id);
1946

1947 1948 1949
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1950
		if (ata_id_has_lba(id)) {
1951
			const char *lba_desc;
1952
			char ncq_desc[20];
1953

1954 1955
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1956
			if (ata_id_has_lba48(id)) {
1957
				dev->flags |= ATA_DFLAG_LBA48;
1958
				lba_desc = "LBA48";
1959 1960 1961 1962

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1963
			}
1964

1965 1966 1967
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1968
			/* print device info to dmesg */
1969 1970 1971 1972 1973 1974 1975
			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",
1976
					(unsigned long long)dev->n_sectors,
1977 1978
					dev->multi_count, lba_desc, ncq_desc);
			}
1979
		} else {
1980 1981 1982
			/* CHS */

			/* Default translation */
1983 1984 1985
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1986

1987
			if (ata_id_current_chs_valid(id)) {
1988
				/* Current CHS translation is valid. */
1989 1990 1991
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1992 1993 1994
			}

			/* print device info to dmesg */
1995
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1996
				ata_dev_printk(dev, KERN_INFO,
1997 1998 1999
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2000
				ata_dev_printk(dev, KERN_INFO,
2001 2002 2003 2004 2005
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2006 2007
		}

2008
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2009 2010 2011
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2012
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2013 2014
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2015

2016
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2017
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2018
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2019 2020
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2021
			rc = -EINVAL;
L
Linus Torvalds 已提交
2022 2023
			goto err_out_nosup;
		}
2024
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2025

2026 2027 2028 2029
		/*
		 * check to see if this ATAPI device supports
		 * Asynchronous Notification
		 */
T
Tejun Heo 已提交
2030 2031 2032
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id)) {
			unsigned int err_mask;

2033
			/* issue SET feature command to turn this on */
T
Tejun Heo 已提交
2034 2035
			err_mask = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
			if (err_mask)
2036
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2037 2038 2039
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2040
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2041 2042
				atapi_an_string = ", ATAPI AN";
			}
2043 2044
		}

2045
		if (ata_id_cdb_intr(dev->id)) {
2046
			dev->flags |= ATA_DFLAG_CDB_INTR;
2047 2048
			cdb_intr_string = ", CDB intr";
		}
2049

L
Linus Torvalds 已提交
2050
		/* print device info to dmesg */
2051
		if (ata_msg_drv(ap) && print_info)
2052
			ata_dev_printk(dev, KERN_INFO,
T
Tejun Heo 已提交
2053
				       "ATAPI: %s, %s, max %s%s%s\n",
2054
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2055
				       ata_mode_string(xfer_mask),
T
Tejun Heo 已提交
2056
				       cdb_intr_string, atapi_an_string);
L
Linus Torvalds 已提交
2057 2058
	}

2059 2060 2061 2062 2063
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
	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");
		}
	}

2076
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2077
	if (ata_dev_knobble(dev)) {
2078
		if (ata_msg_drv(ap) && print_info)
2079 2080
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2081
		dev->udma_mask &= ATA_UDMA5;
2082 2083 2084
		dev->max_sectors = ATA_MAX_SECTORS;
	}

T
Tejun Heo 已提交
2085
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2086 2087
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2088

2089
	if (ap->ops->dev_config)
2090
		ap->ops->dev_config(dev);
2091

2092 2093 2094
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2095
	return 0;
L
Linus Torvalds 已提交
2096 2097

err_out_nosup:
2098
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2099 2100
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2101
	return rc;
L
Linus Torvalds 已提交
2102 2103
}

A
Alan Cox 已提交
2104
/**
2105
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2106 2107
 *	@ap: port
 *
2108
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2109 2110 2111 2112 2113 2114 2115 2116 2117
 *	detection.
 */

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

/**
2118
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2119 2120
 *	@ap: port
 *
2121
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153
 *	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
2154 2155 2156 2157
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2158 2159 2160 2161
 *	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
2162
 *	LOCKING:
J
Jeff Garzik 已提交
2163
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2164 2165
 *
 *	RETURNS:
2166
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2167 2168
 */

2169
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2170
{
2171
	unsigned int classes[ATA_MAX_DEVICES];
2172
	int tries[ATA_MAX_DEVICES];
2173
	int rc;
2174
	struct ata_device *dev;
L
Linus Torvalds 已提交
2175

2176
	ata_port_probe(ap);
2177

2178 2179
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2180 2181

 retry:
2182
	/* reset and determine device classes */
2183
	ap->ops->phy_reset(ap);
2184

2185
	ata_link_for_each_dev(dev, &ap->link) {
2186 2187 2188 2189 2190
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2191

2192
		dev->class = ATA_DEV_UNKNOWN;
2193
	}
L
Linus Torvalds 已提交
2194

2195
	ata_port_probe(ap);
2196

A
Alan Cox 已提交
2197 2198 2199
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

2200 2201
	ata_link_for_each_dev(dev, &ap->link)
		dev->pio_mode = XFER_PIO_0;
A
Alan Cox 已提交
2202

2203 2204 2205 2206
	/* 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 */

2207 2208 2209
	ata_link_for_each_dev(dev, &ap->link) {
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2210

2211
		if (!ata_dev_enabled(dev))
2212 2213
			continue;

2214 2215
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2216 2217
		if (rc)
			goto fail;
2218 2219
	}

A
Alan Cox 已提交
2220 2221 2222 2223
	/* 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
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
	/* 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;
	}

2235 2236 2237
	/* 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 */

2238
	ata_link_for_each_dev(dev, &ap->link) {
2239 2240
		if (!ata_dev_enabled(dev))
			continue;
2241

T
Tejun Heo 已提交
2242
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2243
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2244
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2245 2246
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2247 2248
	}

2249
	/* configure transfer mode */
2250
	rc = ata_set_mode(&ap->link, &dev);
2251
	if (rc)
2252
		goto fail;
L
Linus Torvalds 已提交
2253

2254 2255
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2256
			return 0;
L
Linus Torvalds 已提交
2257

2258 2259
	/* no device present, disable port */
	ata_port_disable(ap);
2260
	return -ENODEV;
2261 2262

 fail:
2263 2264
	tries[dev->devno]--;

2265 2266
	switch (rc) {
	case -EINVAL:
2267
		/* eeek, something went very wrong, give up */
2268 2269
		tries[dev->devno] = 0;
		break;
2270 2271 2272 2273

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2274
	case -EIO:
2275 2276 2277 2278
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2279
			sata_down_spd_limit(&ap->link);
2280 2281
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2282 2283
	}

2284
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2285
		ata_dev_disable(dev);
2286

2287
	goto retry;
L
Linus Torvalds 已提交
2288 2289 2290
}

/**
J
Jeff Garzik 已提交
2291 2292
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2293
 *
J
Jeff Garzik 已提交
2294 2295 2296
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2297
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2298
 *	serialization.
L
Linus Torvalds 已提交
2299 2300 2301 2302
 */

void ata_port_probe(struct ata_port *ap)
{
2303
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2304 2305
}

2306 2307
/**
 *	sata_print_link_status - Print SATA link status
2308
 *	@link: SATA link to printk link status about
2309 2310 2311 2312 2313 2314
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2315
void sata_print_link_status(struct ata_link *link)
2316
{
2317
	u32 sstatus, scontrol, tmp;
2318

2319
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2320
		return;
2321
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2322

2323
	if (ata_link_online(link)) {
2324
		tmp = (sstatus >> 4) & 0xf;
2325
		ata_link_printk(link, KERN_INFO,
2326 2327
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2328
	} else {
2329
		ata_link_printk(link, KERN_INFO,
2330 2331
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2332 2333 2334
	}
}

L
Linus Torvalds 已提交
2335
/**
J
Jeff Garzik 已提交
2336 2337
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2338
 *
J
Jeff Garzik 已提交
2339 2340 2341
 *	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
2342 2343
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2344
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2345 2346 2347 2348
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
2349
	struct ata_link *link = &ap->link;
L
Linus Torvalds 已提交
2350
	unsigned long timeout = jiffies + (HZ * 5);
2351
	u32 sstatus;
L
Linus Torvalds 已提交
2352 2353

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2354
		/* issue phy wake/reset */
2355
		sata_scr_write_flush(link, SCR_CONTROL, 0x301);
2356 2357 2358
		/* 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
2359
	}
2360
	/* phy wake/clear reset */
2361
	sata_scr_write_flush(link, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2362 2363 2364 2365

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2366
		sata_scr_read(link, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2367 2368 2369 2370
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2371
	/* print link status */
2372
	sata_print_link_status(link);
2373

2374
	/* TODO: phy layer with polling, timeouts, etc. */
2375
	if (!ata_link_offline(link))
L
Linus Torvalds 已提交
2376
		ata_port_probe(ap);
2377
	else
L
Linus Torvalds 已提交
2378 2379
		ata_port_disable(ap);

2380
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391
		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
2392 2393
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2394
 *
J
Jeff Garzik 已提交
2395 2396
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2397 2398
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2399
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2400 2401 2402 2403 2404
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2405
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2406 2407 2408 2409
		return;
	ata_bus_reset(ap);
}

2410 2411 2412 2413 2414 2415 2416
/**
 *	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
 */
2417

T
Tejun Heo 已提交
2418
struct ata_device *ata_dev_pair(struct ata_device *adev)
2419
{
T
Tejun Heo 已提交
2420 2421
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2422
	if (!ata_dev_enabled(pair))
2423 2424 2425 2426
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2427
/**
J
Jeff Garzik 已提交
2428 2429
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2430
 *
J
Jeff Garzik 已提交
2431 2432 2433 2434 2435
 *	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
2436
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2437
 *	serialization.
L
Linus Torvalds 已提交
2438 2439 2440 2441
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2442 2443
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2444
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2445 2446
}

2447
/**
2448
 *	sata_down_spd_limit - adjust SATA spd limit downward
2449
 *	@link: Link to adjust SATA spd limit for
2450
 *
2451
 *	Adjust SATA spd limit of @link downward.  Note that this
2452
 *	function only adjusts the limit.  The change must be applied
2453
 *	using sata_set_spd().
2454 2455 2456 2457 2458 2459 2460
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2461
int sata_down_spd_limit(struct ata_link *link)
2462
{
2463 2464
	u32 sstatus, spd, mask;
	int rc, highbit;
2465

2466
	if (!sata_scr_valid(link))
2467 2468 2469
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2470
	 * If not, use cached value in link->sata_spd.
2471
	 */
2472
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2473 2474 2475
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2476
		spd = link->sata_spd;
2477

2478
	mask = link->sata_spd_limit;
2479 2480
	if (mask <= 1)
		return -EINVAL;
2481 2482

	/* unconditionally mask off the highest bit */
2483 2484 2485
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2486 2487 2488 2489 2490 2491 2492 2493 2494
	/* 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? */
2495 2496 2497
	if (!mask)
		return -EINVAL;

2498
	link->sata_spd_limit = mask;
2499

2500
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2501
			sata_spd_string(fls(mask)));
2502 2503 2504 2505

	return 0;
}

2506
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2507 2508 2509
{
	u32 spd, limit;

2510
	if (link->sata_spd_limit == UINT_MAX)
2511 2512
		limit = 0;
	else
2513
		limit = fls(link->sata_spd_limit);
2514 2515 2516 2517 2518 2519 2520 2521

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

	return spd != limit;
}

/**
2522
 *	sata_set_spd_needed - is SATA spd configuration needed
2523
 *	@link: Link in question
2524 2525
 *
 *	Test whether the spd limit in SControl matches
2526
 *	@link->sata_spd_limit.  This function is used to determine
2527 2528 2529 2530 2531 2532 2533 2534 2535
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2536
int sata_set_spd_needed(struct ata_link *link)
2537 2538 2539
{
	u32 scontrol;

2540
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2541 2542
		return 0;

2543
	return __sata_set_spd_needed(link, &scontrol);
2544 2545 2546
}

/**
2547
 *	sata_set_spd - set SATA spd according to spd limit
2548
 *	@link: Link to set SATA spd for
2549
 *
2550
 *	Set SATA spd of @link according to sata_spd_limit.
2551 2552 2553 2554 2555 2556
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2557
 *	changed.  Negative errno if SCR registers are inaccessible.
2558
 */
2559
int sata_set_spd(struct ata_link *link)
2560 2561
{
	u32 scontrol;
2562
	int rc;
2563

2564
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2565
		return rc;
2566

2567
	if (!__sata_set_spd_needed(link, &scontrol))
2568 2569
		return 0;

2570
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2571 2572
		return rc;

2573 2574 2575
	return 1;
}

A
Alan Cox 已提交
2576 2577 2578 2579 2580
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2581
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2582
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2583 2584 2585
 * 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
2586 2587 2588 2589 2590 2591 2592 2593 2594
 */

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 },

2595 2596
	{ 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
2597 2598 2599 2600 2601
	{ 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 }, */
2602

A
Alan Cox 已提交
2603 2604 2605
	{ 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 },
2606

A
Alan Cox 已提交
2607 2608 2609 2610
	{ 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 },

2611 2612
	{ 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
2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657
	{ 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
2658
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2659
			return NULL;
2660
	return t;
A
Alan Cox 已提交
2661 2662 2663 2664 2665 2666 2667 2668 2669
}

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;

	/*
2670
	 * Find the mode.
2671
	 */
A
Alan Cox 已提交
2672 2673 2674 2675

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

2676 2677
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
	/*
	 * 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.
	 */

2698
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2699 2700

	/*
2701 2702 2703
	 * 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
2704 2705
	 */

2706
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2707 2708 2709 2710 2711
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2712
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723
	 */

	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
2724

2725 2726 2727 2728 2729
	/* 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
2730 2731 2732 2733

	return 0;
}

2734 2735 2736
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2737
 *	@sel: ATA_DNXFER_* selector
2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748
 *
 *	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
 */
2749
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2750
{
2751 2752 2753 2754
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2755

2756 2757
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2758

2759 2760 2761 2762
	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);
2763

2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815
	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);
	}
2816 2817 2818 2819 2820 2821 2822

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

	return 0;
}

T
Tejun Heo 已提交
2823
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2824
{
T
Tejun Heo 已提交
2825
	struct ata_eh_context *ehc = &dev->link->eh_context;
2826 2827
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2828

2829
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2830 2831 2832
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2833
	err_mask = ata_dev_set_xfermode(dev);
2834 2835 2836
	/* 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
2837 2838 2839 2840 2841
	/* 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;
2842
	if (err_mask) {
2843 2844
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2845 2846
		return -EIO;
	}
L
Linus Torvalds 已提交
2847

2848
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
2849
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
2850
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2851
	if (rc)
2852
		return rc;
2853

2854 2855
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2856

2857 2858
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2859
	return 0;
L
Linus Torvalds 已提交
2860 2861 2862
}

/**
2863
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
2864
 *	@link: link on which timings will be programmed
2865
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2866
 *
2867 2868 2869
 *	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
2870
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2871
 *
L
Linus Torvalds 已提交
2872
 *	LOCKING:
J
Jeff Garzik 已提交
2873
 *	PCI/etc. bus probe sem.
2874 2875 2876
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2877
 */
2878

2879
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2880
{
2881
	struct ata_port *ap = link->ap;
2882
	struct ata_device *dev;
2883
	int rc = 0, used_dma = 0, found = 0;
2884

2885
	/* step 1: calculate xfer_mask */
2886
	ata_link_for_each_dev(dev, link) {
2887
		unsigned int pio_mask, dma_mask;
2888

2889
		if (!ata_dev_enabled(dev))
2890 2891
			continue;

T
Tejun Heo 已提交
2892
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2893

2894 2895 2896 2897
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2898

2899
		found = 1;
2900 2901
		if (dev->dma_mode)
			used_dma = 1;
2902
	}
2903
	if (!found)
2904
		goto out;
2905 2906

	/* step 2: always set host PIO timings */
2907
	ata_link_for_each_dev(dev, link) {
2908 2909 2910 2911
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2912
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2913
			rc = -EINVAL;
2914
			goto out;
2915 2916 2917 2918 2919 2920 2921
		}

		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
2922

2923
	/* step 3: set host DMA timings */
2924
	ata_link_for_each_dev(dev, link) {
2925 2926 2927 2928 2929 2930 2931 2932
		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
2933 2934

	/* step 4: update devices' xfer mode */
2935
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
2936
		/* don't update suspended devices' xfer mode */
2937
		if (!ata_dev_enabled(dev))
2938 2939
			continue;

T
Tejun Heo 已提交
2940
		rc = ata_dev_set_mode(dev);
2941
		if (rc)
2942
			goto out;
2943
	}
L
Linus Torvalds 已提交
2944

2945 2946
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2947
	 */
J
Jeff Garzik 已提交
2948
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2949
		ap->host->simplex_claimed = ap;
2950

2951 2952 2953 2954
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2955 2956
}

2957 2958
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
2959
 *	@link: link on which timings will be programmed
2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971
 *	@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
 */
2972
int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
2973
{
2974 2975
	struct ata_port *ap = link->ap;

2976 2977
	/* has private set_mode? */
	if (ap->ops->set_mode)
2978 2979
		return ap->ops->set_mode(link, r_failed_dev);
	return ata_do_set_mode(link, r_failed_dev);
2980 2981
}

2982 2983 2984 2985 2986 2987 2988 2989 2990 2991
/**
 *	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
2992
 *	spin_lock_irqsave(host lock)
2993 2994 2995 2996 2997 2998 2999 3000 3001
 */

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
3002 3003 3004 3005 3006 3007
/**
 *	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
3008 3009 3010
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
3011 3012 3013 3014 3015
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
3016
 */
3017 3018
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
3019 3020 3021 3022 3023 3024 3025
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
3026 3027
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3028 3029 3030 3031
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

3032
	if (status != 0xff && (status & ATA_BUSY))
3033
		ata_port_printk(ap, KERN_WARNING,
3034 3035
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
3036 3037

	timeout = timer_start + tmout;
3038 3039
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3040 3041 3042 3043
		msleep(50);
		status = ata_chk_status(ap);
	}

3044 3045 3046
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
3047
	if (status & ATA_BUSY) {
3048
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
3049 3050
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
3051
		return -EBUSY;
L
Linus Torvalds 已提交
3052 3053 3054 3055 3056
	}

	return 0;
}

3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081
/**
 *	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;
3082
		if (!ata_link_online(&ap->link) && status == 0xff)
3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100
			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
3101 3102 3103 3104
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3105
	int rc, ret = 0;
L
Linus Torvalds 已提交
3106 3107 3108 3109

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3110 3111
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3112 3113 3114 3115 3116
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3117
	}
L
Linus Torvalds 已提交
3118

3119 3120
	/* 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
3121
	 */
3122 3123
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3124 3125

		ap->ops->dev_select(ap, 1);
3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140

		/* 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 */
		}

3141
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3142 3143 3144 3145 3146
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3147
	}
L
Linus Torvalds 已提交
3148 3149 3150 3151 3152 3153 3154

	/* 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);
3155

T
Tejun Heo 已提交
3156
	return ret;
L
Linus Torvalds 已提交
3157 3158
}

3159 3160
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3161 3162 3163
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3164
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3165 3166

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3167 3168 3169 3170 3171
	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
3172 3173 3174 3175 3176 3177 3178 3179

	/* 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.
3180 3181
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3182 3183 3184
	 */
	msleep(150);

3185
	/* Before we perform post reset processing we want to see if
3186 3187 3188
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3189
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3190
		return -ENODEV;
3191

3192
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
}

/**
 *	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
3208
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3209
 *	Obtains host lock.
L
Linus Torvalds 已提交
3210 3211
 *
 *	SIDE EFFECTS:
3212
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3213 3214 3215 3216
 */

void ata_bus_reset(struct ata_port *ap)
{
T
Tejun Heo 已提交
3217
	struct ata_device *device = ap->link.device;
L
Linus Torvalds 已提交
3218 3219 3220
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3221
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3222
	int rc;
L
Linus Torvalds 已提交
3223

T
Tejun Heo 已提交
3224
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243

	/* 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
3244 3245 3246
	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
3247
			goto err_out;
T
Tejun Heo 已提交
3248
	}
L
Linus Torvalds 已提交
3249 3250 3251 3252

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3253
	device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
L
Linus Torvalds 已提交
3254
	if ((slave_possible) && (err != 0x81))
3255
		device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
L
Linus Torvalds 已提交
3256 3257

	/* is double-select really necessary? */
T
Tejun Heo 已提交
3258
	if (device[1].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3259
		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3260
	if (device[0].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3261 3262 3263
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
T
Tejun Heo 已提交
3264 3265
	if ((device[0].class == ATA_DEV_NONE) &&
	    (device[1].class == ATA_DEV_NONE))
L
Linus Torvalds 已提交
3266 3267 3268 3269
		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
3270
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3271 3272 3273 3274 3275 3276
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3277
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
3278
	ata_port_disable(ap);
L
Linus Torvalds 已提交
3279 3280 3281 3282

	DPRINTK("EXIT\n");
}

3283
/**
3284 3285
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3286
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3287
 *	@deadline: deadline jiffies for the operation
3288
 *
3289
*	Make sure SStatus of @link reaches stable state, determined by
3290 3291
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3292 3293
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3294 3295
 *	until timeout then returns 0 if DET is stable at 1.
 *
3296 3297 3298
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3299 3300 3301 3302 3303 3304
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3305 3306
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3307
{
3308
	unsigned long interval_msec = params[0];
3309 3310
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3311 3312 3313
	u32 last, cur;
	int rc;

3314 3315 3316 3317
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3318
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3319 3320 3321 3322 3323 3324 3325 3326
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3327
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3328 3329 3330 3331 3332
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3333
			if (cur == 1 && time_before(jiffies, deadline))
3334 3335 3336 3337 3338 3339 3340 3341 3342 3343
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3344 3345 3346
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3347
		if (time_after(jiffies, deadline))
3348
			return -EPIPE;
3349 3350 3351 3352
	}
}

/**
3353 3354
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3355
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3356
 *	@deadline: deadline jiffies for the operation
3357
 *
3358
 *	Resume SATA phy @link and debounce it.
3359 3360 3361 3362 3363 3364 3365
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3366 3367
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3368 3369
{
	u32 scontrol;
3370 3371
	int rc;

3372
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3373
		return rc;
3374

3375
	scontrol = (scontrol & 0x0f0) | 0x300;
3376

3377
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3378
		return rc;
3379

3380 3381 3382 3383
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3384

3385
	return sata_link_debounce(link, params, deadline);
3386 3387
}

3388 3389
/**
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3390
 *	@link: ATA link to be reset
3391
 *	@deadline: deadline jiffies for the operation
3392
 *
T
Tejun Heo 已提交
3393
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3394 3395 3396 3397
 *	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.
3398 3399 3400 3401 3402 3403 3404
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3405
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3406
{
T
Tejun Heo 已提交
3407
	struct ata_port *ap = link->ap;
3408
	struct ata_eh_context *ehc = &link->eh_context;
3409
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3410 3411
	int rc;

T
Tejun Heo 已提交
3412
	/* handle link resume */
3413
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3414
	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3415 3416
		ehc->i.action |= ATA_EH_HARDRESET;

3417 3418 3419 3420
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3421
	/* if SATA, resume link */
3422
	if (ap->flags & ATA_FLAG_SATA) {
3423
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3424 3425
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3426
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3427 3428 3429 3430 3431 3432
					"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.
	 */
3433
	if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
T
Tejun Heo 已提交
3434
		rc = ata_wait_ready(ap, deadline);
3435
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3436
			ata_link_printk(link, KERN_WARNING, "device not ready "
T
Tejun Heo 已提交
3437 3438 3439 3440
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3441 3442 3443 3444

	return 0;
}

3445 3446
/**
 *	ata_std_softreset - reset host port via ATA SRST
T
Tejun Heo 已提交
3447
 *	@link: ATA link to reset
3448
 *	@classes: resulting classes of attached devices
3449
 *	@deadline: deadline jiffies for the operation
3450
 *
3451
 *	Reset host port using ATA SRST.
3452 3453 3454 3455 3456 3457 3458
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3459
int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3460
		      unsigned long deadline)
3461
{
T
Tejun Heo 已提交
3462
	struct ata_port *ap = link->ap;
3463
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3464 3465
	unsigned int devmask = 0;
	int rc;
3466 3467 3468 3469
	u8 err;

	DPRINTK("ENTER\n");

3470
	if (ata_link_offline(link)) {
3471 3472 3473 3474
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485
	/* 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);
3486
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3487
	/* if link is occupied, -ENODEV too is an error */
3488
	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
T
Tejun Heo 已提交
3489
		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3490
		return rc;
3491 3492 3493
	}

	/* determine by signature whether we have ATA or ATAPI devices */
3494 3495
	classes[0] = ata_dev_try_classify(&link->device[0],
					  devmask & (1 << 0), &err);
3496
	if (slave_possible && err != 0x81)
3497 3498
		classes[1] = ata_dev_try_classify(&link->device[1],
						  devmask & (1 << 1), &err);
3499

3500
 out:
3501 3502 3503 3504 3505
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
T
Tejun Heo 已提交
3506 3507
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
3508
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3509
 *	@deadline: deadline jiffies for the operation
3510
 *
T
Tejun Heo 已提交
3511
 *	SATA phy-reset @link using DET bits of SControl register.
3512 3513 3514 3515 3516 3517 3518
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3519
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3520
			unsigned long deadline)
3521
{
3522
	u32 scontrol;
3523
	int rc;
3524

3525 3526
	DPRINTK("ENTER\n");

3527
	if (sata_set_spd_needed(link)) {
3528 3529 3530 3531 3532
		/* 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.
		 */
3533
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3534
			goto out;
3535

3536
		scontrol = (scontrol & 0x0f0) | 0x304;
3537

3538
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3539
			goto out;
3540

3541
		sata_set_spd(link);
3542 3543 3544
	}

	/* issue phy wake/reset */
3545
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3546
		goto out;
3547

3548
	scontrol = (scontrol & 0x0f0) | 0x301;
3549

3550
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3551
		goto out;
3552

3553
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3554 3555 3556 3557
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3558 3559
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3560 3561 3562 3563 3564 3565 3566
 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
3567
 *	@link: link to reset
3568
 *	@class: resulting class of attached device
3569
 *	@deadline: deadline jiffies for the operation
3570 3571 3572 3573 3574 3575 3576 3577 3578 3579
 *
 *	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
3580
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3581
		       unsigned long deadline)
3582
{
T
Tejun Heo 已提交
3583
	struct ata_port *ap = link->ap;
3584
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3585 3586 3587 3588 3589
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
T
Tejun Heo 已提交
3590
	rc = sata_link_hardreset(link, timing, deadline);
3591
	if (rc) {
T
Tejun Heo 已提交
3592
		ata_link_printk(link, KERN_ERR,
3593 3594 3595
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3596 3597

	/* TODO: phy layer with polling, timeouts, etc. */
3598
	if (ata_link_offline(link)) {
3599 3600 3601 3602 3603
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3604 3605 3606
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3607
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3608 3609
	/* link occupied, -ENODEV too is an error */
	if (rc) {
T
Tejun Heo 已提交
3610
		ata_link_printk(link, KERN_ERR,
3611 3612
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3613 3614
	}

3615 3616
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3617
	*class = ata_dev_try_classify(link->device, 1, NULL);
3618 3619 3620 3621 3622 3623 3624

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

/**
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3625
 *	@link: the target ata_link
3626 3627 3628 3629 3630 3631 3632 3633 3634
 *	@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
3635
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3636
{
T
Tejun Heo 已提交
3637
	struct ata_port *ap = link->ap;
3638 3639
	u32 serror;

3640 3641 3642
	DPRINTK("ENTER\n");

	/* print link status */
3643
	sata_print_link_status(link);
3644

3645
	/* clear SError */
3646 3647
	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
		sata_scr_write(link, SCR_ERROR, serror);
3648

3649 3650 3651 3652 3653 3654
	/* 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);

3655 3656 3657 3658 3659 3660 3661
	/* 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
3662 3663
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3664 3665 3666 3667

	DPRINTK("EXIT\n");
}

3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683
/**
 *	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
3684 3685
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3686 3687
{
	const u16 *old_id = dev->id;
3688 3689
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3690 3691

	if (dev->class != new_class) {
3692 3693
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3694 3695 3696
		return 0;
	}

3697 3698 3699 3700
	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]));
3701 3702

	if (strcmp(model[0], model[1])) {
3703 3704
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3705 3706 3707 3708
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3709 3710
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3711 3712 3713 3714 3715 3716 3717
		return 0;
	}

	return 1;
}

/**
3718
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3719
 *	@dev: target ATA device
3720
 *	@readid_flags: read ID flags
3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
 *
 *	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
 */
3731
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3732
{
3733
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3734
	u16 *id = (void *)dev->link->ap->sector_buf;
3735 3736
	int rc;

3737
	/* read ID data */
3738
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3739
	if (rc)
3740
		return rc;
3741 3742

	/* is the device still there? */
3743 3744
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3745

3746
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3747 3748 3749 3750 3751 3752
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3753
 *	@new_class: new class code
3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764
 *	@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
 */
3765 3766
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3767
{
3768
	u64 n_sectors = dev->n_sectors;
3769 3770 3771 3772 3773
	int rc;

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

3774 3775 3776 3777 3778 3779 3780 3781 3782
	/* 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;
	}

3783 3784 3785 3786
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3787 3788

	/* configure device according to the new ID */
3789
	rc = ata_dev_configure(dev);
3790 3791 3792 3793
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
3794 3795
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
3796 3797 3798 3799
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
3800 3801 3802 3803

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

3804 3805 3806 3807 3808
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3809 3810

 fail:
3811
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3812 3813 3814
	return rc;
}

3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851
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 },
3852
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3853
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3854 3855
	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
				NULL,		ATA_HORKAGE_NODMA },
3856

3857
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3858
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3859

3860 3861 3862 3863 3864
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3865 3866
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3867
	/* NCQ is broken */
3868
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3869
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
3870
	{ "HITACHI HDS7250SASUN500G 0621KTAWSD", "K2AOAJ0AHITACHI",
3871 3872
	  ATA_HORKAGE_NONCQ },

3873 3874 3875 3876 3877
	/* 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, },
3878 3879
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3880
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3881
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3882
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3883
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
3884
	{ "ST9160821AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3885
	{ "ST3160812AS",	"3.AD",		ATA_HORKAGE_NONCQ, },
3886
	{ "SAMSUNG HD401LJ",	"ZZ100-15",	ATA_HORKAGE_NONCQ, },
3887

3888 3889 3890 3891 3892
	/* 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 },
3893 3894 3895

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3896
};
3897

3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914
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
3915
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3916
{
T
Tejun Heo 已提交
3917 3918
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3919
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3920

T
Tejun Heo 已提交
3921 3922
	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
3923

3924
	while (ad->model_num) {
3925
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3926 3927
			if (ad->model_rev == NULL)
				return ad->horkage;
3928
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3929
				return ad->horkage;
3930
		}
3931
		ad++;
3932
	}
L
Linus Torvalds 已提交
3933 3934 3935
	return 0;
}

3936 3937 3938 3939 3940 3941
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
3942
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3943 3944
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
3945
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3946 3947
}

3948 3949 3950 3951
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3952 3953 3954 3955
 *	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...
3956 3957 3958 3959
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3960
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3961
{
T
Tejun Heo 已提交
3962 3963
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
3964
	struct ata_host *host = ap->host;
3965
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3966

3967
	/* controller modes available */
3968 3969 3970
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3971
	/* drive modes available */
3972 3973 3974
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3975

3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986
	/*
	 *	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));
	}

3987 3988
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3989 3990
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3991
	}
3992

3993 3994
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3995 3996 3997
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3998
	}
3999

J
Jeff Garzik 已提交
4000 4001 4002
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4003
	if (ap->ops->mode_filter)
4004
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4005

4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024
	/* 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);
		}

4025 4026
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4027 4028 4029 4030 4031 4032
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4033 4034 4035
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4036
 *	LOCKING:
J
Jeff Garzik 已提交
4037
 *	PCI/etc. bus probe sem.
4038 4039 4040
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4041 4042
 */

T
Tejun Heo 已提交
4043
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4044
{
4045
	struct ata_taskfile tf;
4046
	unsigned int err_mask;
L
Linus Torvalds 已提交
4047 4048 4049 4050

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

T
Tejun Heo 已提交
4051 4052 4053
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4054
	ata_tf_init(dev, &tf);
4055 4056
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4057
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4058 4059
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
4060

T
Tejun Heo 已提交
4061
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097

	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
4098

4099 4100
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4101 4102
}

4103 4104 4105
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4106 4107
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4108 4109
 *
 *	LOCKING:
4110 4111 4112 4113
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4114
 */
T
Tejun Heo 已提交
4115 4116
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4117
{
4118
	struct ata_taskfile tf;
4119
	unsigned int err_mask;
4120 4121 4122

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4123
		return AC_ERR_INVALID;
4124 4125 4126 4127

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

T
Tejun Heo 已提交
4128
	ata_tf_init(dev, &tf);
4129 4130 4131 4132 4133
	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 */
4134

T
Tejun Heo 已提交
4135
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
4136 4137 4138 4139 4140
	/* 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;
4141

4142 4143
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4144 4145
}

L
Linus Torvalds 已提交
4146
/**
J
Jeff Garzik 已提交
4147 4148 4149 4150
 *	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
4151 4152
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4153
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4154
 */
4155
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4156 4157
{
	struct ata_port *ap = qc->ap;
4158
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4159
	int dir = qc->dma_dir;
4160
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4161

4162 4163
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4164 4165

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4166
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4167

J
Jeff Garzik 已提交
4168
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4169

4170 4171 4172 4173 4174 4175 4176 4177
	/* 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) {
4178
		if (qc->n_elem)
4179
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4180 4181 4182 4183 4184 4185
		/* 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);
4186
			kunmap_atomic(addr, KM_IRQ0);
4187 4188
		}
	} else {
4189
		if (qc->n_elem)
4190
			dma_unmap_single(ap->dev,
4191 4192
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4193 4194 4195 4196 4197 4198
		/* 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
4199 4200

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4201
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4202 4203 4204 4205 4206 4207
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4208 4209 4210
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4211
 *	LOCKING:
J
Jeff Garzik 已提交
4212
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4213 4214 4215 4216 4217
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4218 4219
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4220

4221
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4222
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4223 4224

	idx = 0;
4225
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254
		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);
}
4255

4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317
/**
 *	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
4318 4319 4320 4321
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4322 4323 4324 4325
 *	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
4326
 *	LOCKING:
J
Jeff Garzik 已提交
4327
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4328
 *
L
Linus Torvalds 已提交
4329 4330 4331 4332 4333 4334
 *	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;
4335 4336 4337 4338 4339 4340

	/* 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;
4341

L
Linus Torvalds 已提交
4342
	if (ap->ops->check_atapi_dma)
4343
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4344

4345
	return 0;
L
Linus Torvalds 已提交
4346
}
4347

L
Linus Torvalds 已提交
4348 4349 4350 4351
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4352 4353
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4354
 *	LOCKING:
J
Jeff Garzik 已提交
4355
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4356 4357 4358 4359 4360 4361 4362 4363 4364
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381
/**
 *	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);
}

4382 4383
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4384 4385 4386 4387 4388 4389 4390 4391 4392 4393
/**
 *	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
4394
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4395 4396
 */

L
Linus Torvalds 已提交
4397 4398 4399 4400
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4401
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4402
	qc->n_elem = 1;
4403
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4404
	qc->buf_virt = buf;
4405
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4406

4407
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4408 4409
}

J
Jeff Garzik 已提交
4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420
/**
 *	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
4421
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4422 4423
 */

L
Linus Torvalds 已提交
4424 4425 4426 4427
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4428
	qc->__sg = sg;
L
Linus Torvalds 已提交
4429
	qc->n_elem = n_elem;
4430
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4431 4432 4433
}

/**
J
Jeff Garzik 已提交
4434 4435 4436 4437
 *	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
4438 4439
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4440
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4441 4442
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4443
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4444 4445 4446 4447 4448 4449
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4450
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4451
	dma_addr_t dma_address;
4452
	int trim_sg = 0;
L
Linus Torvalds 已提交
4453

4454 4455 4456 4457 4458 4459
	/* 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;

4460
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471

		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;
4472 4473
		if (sg->length == 0)
			trim_sg = 1;
4474 4475 4476 4477 4478

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

4479 4480
	if (trim_sg) {
		qc->n_elem--;
4481 4482 4483
		goto skip_map;
	}

4484
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4485
				     sg->length, dir);
4486 4487 4488
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4489
		return -1;
4490
	}
L
Linus Torvalds 已提交
4491 4492

	sg_dma_address(sg) = dma_address;
4493
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4494

4495
skip_map:
L
Linus Torvalds 已提交
4496 4497 4498 4499 4500 4501 4502
	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
4503 4504 4505 4506
 *	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
4507 4508
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4509
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4510 4511
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4512
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4513 4514 4515 4516 4517 4518
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4519 4520
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4521
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4522

T
Tejun Heo 已提交
4523
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4524
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4525

4526 4527 4528 4529 4530 4531 4532
	/* 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;

4533
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547

		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);
4548
			kunmap_atomic(addr, KM_IRQ0);
4549 4550 4551 4552 4553 4554
		}

		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;
4555 4556
		if (lsg->length == 0)
			trim_sg = 1;
4557 4558 4559 4560 4561

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

4562 4563 4564 4565 4566 4567 4568 4569 4570
	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
4571
	dir = qc->dma_dir;
4572
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4573 4574 4575
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4576
		return -1;
4577
	}
L
Linus Torvalds 已提交
4578 4579 4580

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

4581
skip_map:
L
Linus Torvalds 已提交
4582 4583 4584 4585 4586
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4587
/**
4588
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4589 4590 4591 4592 4593 4594 4595 4596
 *	@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
4597
 *	Inherited from caller.
E
Edward Falk 已提交
4598
 */
L
Linus Torvalds 已提交
4599 4600 4601 4602 4603 4604 4605 4606 4607 4608
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
4609
/**
T
Tejun Heo 已提交
4610
 *	ata_data_xfer - Transfer data by PIO
4611
 *	@adev: device to target
A
Albert Lee 已提交
4612 4613
 *	@buf: data buffer
 *	@buflen: buffer length
4614
 *	@write_data: read/write
A
Albert Lee 已提交
4615 4616 4617 4618 4619 4620
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4621 4622
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4623
{
T
Tejun Heo 已提交
4624
	struct ata_port *ap = adev->link->ap;
A
Albert Lee 已提交
4625
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4626

A
Albert Lee 已提交
4627
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4628
	if (write_data)
T
Tejun Heo 已提交
4629
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4630
	else
T
Tejun Heo 已提交
4631
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4632 4633 4634 4635 4636 4637 4638 4639

	/* 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
4640
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4641
		} else {
T
Tejun Heo 已提交
4642
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4643 4644 4645
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4646 4647
}

4648
/**
T
Tejun Heo 已提交
4649
 *	ata_data_xfer_noirq - Transfer data by PIO
4650 4651 4652 4653 4654
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4655
 *	Transfer data from/to the device data register by PIO. Do the
4656 4657 4658 4659 4660
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4661 4662
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4663 4664 4665
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4666
	ata_data_xfer(adev, buf, buflen, write_data);
4667 4668 4669 4670
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4671
/**
4672
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4673 4674
 *	@qc: Command on going
 *
4675
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4676 4677 4678 4679 4680
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4681 4682 4683
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4684
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4685 4686 4687 4688 4689
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4690
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4691
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4692 4693

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4694
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4695 4696 4697 4698 4699 4700 4701

	/* 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");

4702 4703 4704
	if (PageHighMem(page)) {
		unsigned long flags;

4705
		/* FIXME: use a bounce buffer */
4706 4707
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4708

4709
		/* do the actual data transfer */
4710
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4711

4712 4713 4714 4715
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4716
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4717
	}
L
Linus Torvalds 已提交
4718

4719 4720
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4721

T
Tejun Heo 已提交
4722
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4723 4724 4725 4726 4727
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4728
/**
4729
 *	ata_pio_sectors - Transfer one or many sectors.
4730 4731
 *	@qc: Command on going
 *
4732
 *	Transfer one or many sectors of data from/to the
4733 4734 4735 4736 4737
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4738

4739 4740 4741 4742 4743 4744
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
4745
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4746

4747
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4748
			    qc->dev->multi_count);
4749 4750 4751 4752
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
4753 4754

	ata_altstatus(qc->ap); /* flush */
4755 4756
}

4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772
/**
 *	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");
4773
	WARN_ON(qc->dev->cdb_len < 12);
4774

4775
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790
	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
4791 4792
}

A
Albert Lee 已提交
4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804
/**
 *	__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
4805 4806 4807
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4808
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4809 4810 4811 4812 4813
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4814
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4815
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4816 4817

next_sg:
4818
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4819
		/*
4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830
		 * 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 */
4831 4832
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4833 4834

		for (i = 0; i < words; i++)
4835
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4836

A
Albert Lee 已提交
4837
		ap->hsm_task_state = HSM_ST_LAST;
4838 4839 4840
		return;
	}

4841
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4842 4843 4844 4845 4846 4847 4848 4849

	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;

4850
	/* don't overrun current sg */
4851
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4852 4853 4854 4855

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

4856 4857
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4858 4859 4860
	if (PageHighMem(page)) {
		unsigned long flags;

4861
		/* FIXME: use bounce buffer */
4862 4863
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4864

4865
		/* do the actual data transfer */
4866
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4867

4868 4869 4870 4871
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4872
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4873
	}
L
Linus Torvalds 已提交
4874 4875 4876 4877 4878

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

4879
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4880 4881 4882 4883
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4884
	if (bytes)
L
Linus Torvalds 已提交
4885 4886 4887
		goto next_sg;
}

A
Albert Lee 已提交
4888 4889 4890 4891 4892 4893 4894 4895 4896 4897
/**
 *	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
4898 4899 4900 4901 4902 4903 4904
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;

4905 4906 4907 4908 4909 4910 4911 4912 4913 4914
	/* 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
4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925
	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
4926
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4927

L
Linus Torvalds 已提交
4928
	__atapi_pio_bytes(qc, bytes);
4929
	ata_altstatus(ap); /* flush */
L
Linus Torvalds 已提交
4930 4931 4932 4933

	return;

err_out:
4934
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4935
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4936
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4937 4938 4939
}

/**
4940 4941 4942
 *	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
4943
 *
4944 4945
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4946
 */
4947 4948

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4949
{
4950 4951
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4952

4953 4954 4955 4956
	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
4957

4958 4959 4960
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4961 4962
	}

4963 4964
	return 0;
}
L
Linus Torvalds 已提交
4965

T
Tejun Heo 已提交
4966 4967 4968 4969 4970 4971 4972 4973
/**
 *	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
4974
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4975 4976 4977 4978 4979 4980 4981 4982 4983
 *	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) {
4984
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4985

J
Jeff Garzik 已提交
4986 4987
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4988 4989 4990 4991
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4992
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4993 4994 4995 4996 4997
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4998
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4999 5000 5001 5002 5003 5004 5005 5006
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
5007
			spin_lock_irqsave(ap->lock, flags);
5008
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5009
			ata_qc_complete(qc);
5010
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5011 5012 5013 5014 5015
		} else
			ata_qc_complete(qc);
	}
}

5016 5017 5018 5019 5020 5021 5022 5023 5024 5025
/**
 *	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.
 */
5026 5027
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
5028
{
5029 5030 5031
	unsigned long flags = 0;
	int poll_next;

5032 5033
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

5034 5035 5036 5037
	/* 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).
	 */
5038
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5039

5040
fsm_start:
5041
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
5042
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5043

5044 5045
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5046 5047 5048 5049 5050 5051 5052 5053
		/* 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);

5054
		/* check device status */
5055 5056 5057 5058 5059 5060 5061 5062 5063
		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
5064
			ap->hsm_task_state = HSM_ST_ERR;
5065
			goto fsm_start;
L
Linus Torvalds 已提交
5066 5067
		}

5068 5069
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
5070 5071 5072
		 * 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.
5073 5074
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5075 5076
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
5077
			qc->err_mask |= AC_ERR_HSM;
5078 5079
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
5080
		}
L
Linus Torvalds 已提交
5081

5082 5083 5084 5085 5086 5087
		/* 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)
5088
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
5089

5090 5091 5092 5093
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
5094

5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105
			/* 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)
5106
			spin_unlock_irqrestore(ap->lock, flags);
5107 5108 5109 5110

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
5111
		break;
5112

5113 5114 5115 5116 5117
	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) {
5118 5119 5120
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
5121 5122 5123
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5124

5125 5126
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
5127 5128 5129
			 * 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.
5130 5131
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5132 5133 5134
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
5135
				qc->err_mask |= AC_ERR_HSM;
5136 5137
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5138
			}
L
Linus Torvalds 已提交
5139

5140
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
5141

5142 5143 5144
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
5145

5146 5147 5148 5149
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
5150 5151 5152 5153
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
5154 5155 5156 5157 5158 5159
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
5160

5161 5162 5163
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5164

5165 5166 5167 5168 5169 5170 5171 5172 5173
			/* 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.
5174 5175 5176 5177
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5178 5179 5180 5181 5182 5183

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

5184 5185 5186
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5187 5188 5189 5190 5191 5192
				/* 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;
5193 5194
			}

5195 5196 5197 5198 5199
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
5200
				status = ata_wait_idle(ap);
5201 5202 5203 5204
				goto fsm_start;
			}
		}

5205
		poll_next = 1;
L
Linus Torvalds 已提交
5206 5207
		break;

A
Albert Lee 已提交
5208
	case HSM_ST_LAST:
5209 5210
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5211 5212 5213 5214 5215
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5216
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5217
			ap->print_id, qc->dev->devno, status);
5218

5219 5220
		WARN_ON(qc->err_mask);

5221
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5222

5223
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5224
		ata_hsm_qc_complete(qc, in_wq);
5225 5226

		poll_next = 0;
L
Linus Torvalds 已提交
5227 5228
		break;

A
Albert Lee 已提交
5229
	case HSM_ST_ERR:
5230 5231 5232 5233 5234 5235
		/* 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;
5236

5237
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5238
		ata_hsm_qc_complete(qc, in_wq);
5239 5240

		poll_next = 0;
5241 5242
		break;
	default:
5243
		poll_next = 0;
5244
		BUG();
L
Linus Torvalds 已提交
5245 5246
	}

5247
	return poll_next;
L
Linus Torvalds 已提交
5248 5249
}

5250
static void ata_pio_task(struct work_struct *work)
5251
{
5252 5253 5254
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5255
	u8 status;
5256
	int poll_next;
5257

J
Jeff Garzik 已提交
5258
fsm_start:
5259
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5260

5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272
	/*
	 * 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) {
5273
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5274 5275
			return;
		}
5276 5277
	}

5278 5279
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5280

5281 5282 5283 5284
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5285
		goto fsm_start;
5286 5287
}

L
Linus Torvalds 已提交
5288 5289 5290 5291 5292 5293
/**
 *	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
5294
 *	None.
L
Linus Torvalds 已提交
5295 5296 5297 5298 5299 5300 5301
 */

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

5302
	/* no command while frozen */
5303
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5304 5305
		return NULL;

5306 5307
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5308
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5309
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323
			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
5324
 *	None.
L
Linus Torvalds 已提交
5325 5326
 */

T
Tejun Heo 已提交
5327
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5328
{
T
Tejun Heo 已提交
5329
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
5330 5331 5332 5333 5334 5335 5336 5337
	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
5338
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351
	}

	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
5352
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5353 5354 5355
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5356 5357 5358
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5359
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5360

5361 5362 5363 5364
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5365
		clear_bit(tag, &ap->qc_allocated);
5366
	}
L
Linus Torvalds 已提交
5367 5368
}

5369
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5370
{
5371
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5372
	struct ata_link *link = qc->dev->link;
5373

5374 5375
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5376 5377 5378 5379

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

5380
	/* command should be marked inactive atomically with qc completion */
5381
	if (qc->tf.protocol == ATA_PROT_NCQ)
T
Tejun Heo 已提交
5382
		link->sactive &= ~(1 << qc->tag);
5383
	else
T
Tejun Heo 已提交
5384
		link->active_tag = ATA_TAG_POISON;
5385

5386 5387 5388 5389 5390
	/* 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;
5391
	ap->qc_active &= ~(1 << qc->tag);
5392

L
Linus Torvalds 已提交
5393
	/* call completion callback */
5394
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5395 5396
}

5397 5398 5399 5400 5401
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5402
	ap->ops->tf_read(ap, &qc->result_tf);
5403 5404
}

5405 5406 5407 5408 5409 5410 5411 5412 5413
/**
 *	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
5414
 *	spin_lock_irqsave(host lock)
5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433
 */
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) {
5434
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5435 5436 5437 5438 5439 5440 5441

		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 */
5442
				fill_result_tf(qc);
5443 5444 5445 5446 5447 5448 5449
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5450
			fill_result_tf(qc);
5451 5452 5453 5454 5455 5456 5457 5458

		__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)
5459
			fill_result_tf(qc);
5460 5461 5462 5463 5464

		__ata_qc_complete(qc);
	}
}

5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476
/**
 *	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
5477
 *	spin_lock_irqsave(host lock)
5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513
 *
 *	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
5514 5515 5516 5517 5518
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5519
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547
	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
5548
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5549
 */
5550
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5551 5552
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5553
	struct ata_link *link = qc->dev->link;
L
Linus Torvalds 已提交
5554

5555 5556 5557 5558
	/* 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
5559
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5560 5561

	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5562 5563
		WARN_ON(link->sactive & (1 << qc->tag));
		link->sactive |= 1 << qc->tag;
5564
	} else {
T
Tejun Heo 已提交
5565 5566
		WARN_ON(link->sactive);
		link->active_tag = qc->tag;
5567 5568
	}

5569
	qc->flags |= ATA_QCFLAG_ACTIVE;
5570
	ap->qc_active |= 1 << qc->tag;
5571

L
Linus Torvalds 已提交
5572 5573 5574
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5575
				goto sg_err;
L
Linus Torvalds 已提交
5576 5577
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5578
				goto sg_err;
L
Linus Torvalds 已提交
5579 5580 5581 5582 5583 5584 5585
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5586 5587 5588 5589
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5590

5591 5592
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5593 5594 5595
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606
}

/**
 *	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
5607 5608
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5609
 *	LOCKING:
J
Jeff Garzik 已提交
5610
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5611 5612
 *
 *	RETURNS:
5613
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5614 5615
 */

5616
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5617 5618 5619
{
	struct ata_port *ap = qc->ap;

5620 5621 5622 5623 5624 5625
	/* 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:
5626
		case ATA_PROT_NODATA:
5627 5628 5629 5630 5631 5632
		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)
5633
				/* see ata_dma_blacklisted() */
5634 5635 5636 5637 5638 5639 5640
				BUG();
			break;
		default:
			break;
		}
	}

5641
	/* select the device */
L
Linus Torvalds 已提交
5642 5643
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5644
	/* start the command */
L
Linus Torvalds 已提交
5645 5646
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5647 5648 5649
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5650
		ata_tf_to_host(ap, &qc->tf);
5651 5652 5653
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5654
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5655

L
Linus Torvalds 已提交
5656 5657 5658
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5659
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5660

L
Linus Torvalds 已提交
5661 5662 5663
		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 */
5664
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5665 5666
		break;

5667 5668 5669
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5670

J
Jeff Garzik 已提交
5671
		ata_tf_to_host(ap, &qc->tf);
5672

5673 5674 5675
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5676
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5677 5678

			/* always send first data block using
5679
			 * the ata_pio_task() codepath.
5680
			 */
5681
		} else {
5682 5683 5684 5685
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5686
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5687 5688 5689 5690

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5691 5692
		}

L
Linus Torvalds 已提交
5693 5694 5695 5696
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5697 5698 5699
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5700
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5701

5702 5703 5704 5705 5706
		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))
5707
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5708 5709 5710
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5711
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5712

L
Linus Torvalds 已提交
5713 5714
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5715 5716 5717 5718
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5719
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5720 5721 5722 5723
		break;

	default:
		WARN_ON(1);
5724
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739
	}

	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
5740
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5741 5742 5743 5744 5745 5746 5747 5748
 *
 *	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
5749
	struct ata_eh_info *ehi = &ap->link.eh_info;
5750
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5751

5752
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5753
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5754

5755 5756 5757
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5758 5759 5760
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5761

5762 5763 5764 5765 5766
		/* 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
5767 5768
			goto idle_irq;
		break;
5769 5770 5771 5772 5773
	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
5774 5775
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5776 5777 5778 5779 5780 5781 5782

			/* 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);
5783 5784 5785 5786 5787 5788

			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;
			}
5789 5790 5791 5792
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5793 5794 5795 5796
	default:
		goto idle_irq;
	}

5797 5798 5799 5800
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5801

5802 5803 5804 5805
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5806

5807 5808
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5809

5810
	ata_hsm_move(ap, qc, status, 0);
5811 5812 5813 5814 5815

	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
5816 5817 5818 5819 5820 5821 5822
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5823 5824
		ata_chk_status(ap);
		ap->ops->irq_clear(ap);
5825
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5826
		return 1;
L
Linus Torvalds 已提交
5827 5828 5829 5830 5831 5832 5833
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5834
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5835
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5836
 *
J
Jeff Garzik 已提交
5837 5838 5839
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5840
 *	LOCKING:
J
Jeff Garzik 已提交
5841
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5842 5843
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5844
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5845 5846
 */

5847
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5848
{
J
Jeff Garzik 已提交
5849
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5850 5851 5852 5853 5854
	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
5855
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5856

J
Jeff Garzik 已提交
5857
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5858 5859
		struct ata_port *ap;

J
Jeff Garzik 已提交
5860
		ap = host->ports[i];
5861
		if (ap &&
J
Jeff Garzik 已提交
5862
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5863 5864
			struct ata_queued_cmd *qc;

T
Tejun Heo 已提交
5865
			qc = ata_qc_from_tag(ap, ap->link.active_tag);
5866
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5867
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5868 5869 5870 5871
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5872
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5873 5874 5875 5876

	return IRQ_RETVAL(handled);
}

5877 5878
/**
 *	sata_scr_valid - test whether SCRs are accessible
5879
 *	@link: ATA link to test SCR accessibility for
5880
 *
5881
 *	Test whether SCRs are accessible for @link.
5882 5883 5884 5885 5886 5887 5888
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5889
int sata_scr_valid(struct ata_link *link)
5890
{
5891 5892
	struct ata_port *ap = link->ap;

5893
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5894 5895 5896 5897
}

/**
 *	sata_scr_read - read SCR register of the specified port
5898
 *	@link: ATA link to read SCR for
5899 5900 5901
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5902
 *	Read SCR register @reg of @link into *@val.  This function is
5903 5904 5905 5906 5907 5908 5909 5910 5911
 *	guaranteed to succeed if the cable type of the port is SATA
 *	and the port implements ->scr_read.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5912
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5913
{
5914 5915 5916
	struct ata_port *ap = link->ap;

	if (sata_scr_valid(link))
5917
		return ap->ops->scr_read(ap, reg, val);
5918 5919 5920 5921 5922
	return -EOPNOTSUPP;
}

/**
 *	sata_scr_write - write SCR register of the specified port
5923
 *	@link: ATA link to write SCR for
5924 5925 5926
 *	@reg: SCR to write
 *	@val: value to write
 *
5927
 *	Write @val to SCR register @reg of @link.  This function is
5928 5929 5930 5931 5932 5933 5934 5935 5936
 *	guaranteed to succeed if the cable type of the port is SATA
 *	and the port implements ->scr_read.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5937
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5938
{
5939 5940 5941
	struct ata_port *ap = link->ap;

	if (sata_scr_valid(link))
5942
		return ap->ops->scr_write(ap, reg, val);
5943 5944 5945 5946 5947
	return -EOPNOTSUPP;
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5948
 *	@link: ATA link to write SCR for
5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960
 *	@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:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5961
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5962
{
5963
	struct ata_port *ap = link->ap;
5964 5965
	int rc;

5966
	if (sata_scr_valid(link)) {
5967 5968 5969 5970
		rc = ap->ops->scr_write(ap, reg, val);
		if (rc == 0)
			rc = ap->ops->scr_read(ap, reg, &val);
		return rc;
5971 5972 5973 5974 5975
	}
	return -EOPNOTSUPP;
}

/**
5976 5977
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
5978
 *
5979 5980 5981
 *	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).
5982 5983 5984 5985 5986 5987 5988
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
5989
int ata_link_online(struct ata_link *link)
5990 5991 5992
{
	u32 sstatus;

5993 5994
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
5995 5996 5997 5998 5999
		return 1;
	return 0;
}

/**
6000 6001
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
6002
 *
6003 6004 6005
 *	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).
6006 6007 6008 6009 6010 6011 6012
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
6013
int ata_link_offline(struct ata_link *link)
6014 6015 6016
{
	u32 sstatus;

6017 6018
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
6019 6020 6021
		return 1;
	return 0;
}
E
Edward Falk 已提交
6022

6023
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
6024
{
6025
	unsigned int err_mask;
J
Jens Axboe 已提交
6026 6027 6028 6029 6030
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

6031
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
6032 6033 6034 6035
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

6036 6037 6038 6039
	/* 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 */
6040 6041 6042 6043 6044 6045 6046
	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
6047 6048
}

6049
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6050 6051 6052
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
6053 6054 6055 6056
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
6057 6058
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6059
		struct ata_link *link;
6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078

		/* 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;
6079 6080 6081 6082
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100

		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
6101 6102
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
6103 6104
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
6105
 *	Suspend @host.  Actual operation is performed by EH.  This
6106 6107 6108 6109 6110 6111 6112 6113 6114
 *	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
6115
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6116
{
6117
	int rc;
6118

J
Jeff Garzik 已提交
6119
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6120 6121
	if (rc == 0)
		host->dev->power.power_state = mesg;
6122 6123 6124 6125
	return rc;
}

/**
J
Jeff Garzik 已提交
6126 6127
 *	ata_host_resume - resume host
 *	@host: host to resume
6128
 *
J
Jeff Garzik 已提交
6129
 *	Resume @host.  Actual operation is performed by EH.  This
6130 6131 6132 6133 6134 6135
 *	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
6136
void ata_host_resume(struct ata_host *host)
6137
{
J
Jeff Garzik 已提交
6138 6139 6140
	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;
6141
}
6142
#endif
6143

6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155
/**
 *	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.
 */
6156
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
6157
{
6158
	struct device *dev = ap->dev;
6159
	int rc;
L
Linus Torvalds 已提交
6160

6161 6162
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
6163 6164 6165
	if (!ap->prd)
		return -ENOMEM;

6166
	rc = ata_pad_alloc(ap, dev);
6167
	if (rc)
6168
		return rc;
L
Linus Torvalds 已提交
6169

6170 6171
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
6172 6173 6174
	return 0;
}

6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185
/**
 *	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
6186 6187
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
6188 6189
	unsigned long flags;

6190
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
6191 6192
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
6193

6194 6195
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6196
	 * host lock.
6197
	 */
6198
	spin_lock_irqsave(ap->lock, flags);
6199
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6200
	dev->horkage = 0;
6201
	spin_unlock_irqrestore(ap->lock, flags);
6202

6203 6204
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6205 6206 6207 6208 6209
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

6210 6211 6212 6213
/**
 *	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
6214
 *	@pmp: Port multiplier port number
6215 6216 6217 6218 6219 6220
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
6221
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6222 6223 6224 6225 6226 6227 6228
{
	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
6229
	link->pmp = pmp;
6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255
	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.
 */
6256
int sata_link_init_spd(struct ata_link *link)
6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273
{
	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
6274
/**
6275 6276
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6277
 *
6278 6279 6280 6281
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6282
 *
L
Linus Torvalds 已提交
6283
 *	LOCKING:
6284
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6285
 */
6286
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6287
{
6288
	struct ata_port *ap;
L
Linus Torvalds 已提交
6289

6290 6291 6292 6293 6294 6295
	DPRINTK("ENTER\n");

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

6296
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6297
	ap->lock = &host->lock;
6298
	ap->flags = ATA_FLAG_DISABLED;
6299
	ap->print_id = -1;
L
Linus Torvalds 已提交
6300
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6301
	ap->host = host;
6302
	ap->dev = host->dev;
L
Linus Torvalds 已提交
6303
	ap->last_ctl = 0xFF;
6304 6305 6306 6307 6308 6309

#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
6310
#else
6311
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6312
#endif
L
Linus Torvalds 已提交
6313

6314 6315 6316
	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);
6317
	INIT_LIST_HEAD(&ap->eh_done_q);
6318
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6319 6320 6321
	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
6322

6323 6324
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
6325
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
6326 6327 6328 6329 6330 6331 6332 6333

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

6334 6335 6336 6337 6338 6339 6340 6341
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];

6342 6343 6344 6345
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6346 6347 6348
			ap->ops->port_stop(ap);
	}

6349
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6350
		host->ops->host_stop(host);
6351

6352 6353 6354
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6355 6356 6357 6358
		if (!ap)
			continue;

		if (ap->scsi_host)
6359 6360
			scsi_host_put(ap->scsi_host);

6361
		kfree(ap);
6362 6363 6364
		host->ports[i] = NULL;
	}

6365
	dev_set_drvdata(gendev, NULL);
6366 6367
}

6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 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 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432
/**
 *	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;
}

6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470
/**
 *	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;
6471
		ap->link.flags |= pi->link_flags;
6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482
		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;
}

6483 6484 6485 6486 6487 6488 6489
/**
 *	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
6490 6491
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508
 *
 *	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];

6509 6510 6511
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536
		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;
}

6537
/**
J
Jeff Garzik 已提交
6538 6539 6540 6541 6542
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6543 6544 6545 6546 6547
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6548
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6549 6550
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6551
{
J
Jeff Garzik 已提交
6552 6553 6554 6555
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6556 6557
}

6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600
/**
 *	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;

6601 6602 6603
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6604 6605 6606 6607 6608 6609 6610 6611 6612 6613
	/* 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 */
6614
		sata_link_init_spd(&ap->link);
6615

6616
		/* print per-port info to dmesg */
6617 6618 6619 6620
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

		if (!ata_port_is_dummy(ap))
6621 6622
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6623
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6624
					ata_mode_string(xfer_mask),
6625
					ap->link.eh_info.desc);
6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637
		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
6638
			struct ata_eh_info *ehi = &ap->link.eh_info;
6639 6640 6641 6642 6643 6644 6645
			unsigned long flags;

			ata_port_probe(ap);

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

6646 6647
			ehi->probe_mask =
				(1 << ata_link_max_devices(&ap->link)) - 1;
6648 6649 6650
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

6651
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679
			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];

6680
		ata_scsi_scan_host(ap, 1);
6681 6682 6683 6684 6685
	}

	return 0;
}

6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708
/**
 *	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)
{
6709
	int i, rc;
6710 6711 6712 6713 6714 6715 6716 6717 6718 6719

	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;

6720 6721
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6722

6723 6724 6725 6726 6727 6728 6729 6730
	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;
}

6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744
/**
 *	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;
6745
	struct ata_link *link;
6746
	struct ata_device *dev;
6747 6748

	if (!ap->ops->error_handler)
6749
		goto skip_eh;
6750 6751

	/* tell EH we're leaving & flush EH */
6752
	spin_lock_irqsave(ap->lock, flags);
6753
	ap->pflags |= ATA_PFLAG_UNLOADING;
6754
	spin_unlock_irqrestore(ap->lock, flags);
6755 6756 6757 6758 6759 6760

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6761
	spin_lock_irqsave(ap->lock, flags);
6762

6763 6764 6765 6766
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
6767

6768
	spin_unlock_irqrestore(ap->lock, flags);
6769 6770 6771 6772 6773

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6774
	spin_lock_irqsave(ap->lock, flags);
6775
	ata_port_freeze(ap);	/* won't be thawed */
6776
	spin_unlock_irqrestore(ap->lock, flags);
6777 6778

	ata_port_wait_eh(ap);
6779
	cancel_rearming_delayed_work(&ap->hotplug_task);
6780

6781
 skip_eh:
6782
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6783
	scsi_remove_host(ap->scsi_host);
6784 6785
}

T
Tejun Heo 已提交
6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802
/**
 *	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
6803 6804 6805
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6806 6807 6808 6809 6810 6811 6812
 *
 *	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
6813
 */
E
Edward Falk 已提交
6814

L
Linus Torvalds 已提交
6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828
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
6829

6830 6831
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6832 6833 6834 6835
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6836 6837 6838
 *	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
6839 6840 6841 6842
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6843
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6844 6845
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6846
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6847

T
Tejun Heo 已提交
6848
	ata_host_detach(host);
L
Linus Torvalds 已提交
6849 6850 6851
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6852
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883
{
	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
6884

6885
#ifdef CONFIG_PM
6886
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6887 6888
{
	pci_save_state(pdev);
6889
	pci_disable_device(pdev);
6890

6891
	if (mesg.event == PM_EVENT_SUSPEND)
6892
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6893 6894
}

6895
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6896
{
6897 6898
	int rc;

J
Jens Axboe 已提交
6899 6900
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6901

T
Tejun Heo 已提交
6902
	rc = pcim_enable_device(pdev);
6903 6904 6905 6906 6907 6908
	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
6909
	pci_set_master(pdev);
6910
	return 0;
6911 6912
}

6913
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6914
{
J
Jeff Garzik 已提交
6915
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6916 6917
	int rc = 0;

J
Jeff Garzik 已提交
6918
	rc = ata_host_suspend(host, mesg);
6919 6920 6921
	if (rc)
		return rc;

6922
	ata_pci_device_do_suspend(pdev, mesg);
6923 6924 6925 6926 6927 6928

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6929
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6930
	int rc;
6931

6932 6933 6934 6935
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6936
}
6937 6938
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6939 6940 6941 6942 6943
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6944
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6945 6946 6947 6948
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6949 6950 6951 6952 6953 6954
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6955 6956 6957 6958 6959 6960 6961
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6962
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6963 6964
}

6965
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6966 6967
module_exit(ata_exit);

6968
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6969
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985 6986 6987 6988

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;
}

6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999 7000 7001 7002 7003 7004 7005 7006 7007 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
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

	/* Calculate timeout _after_ the first read to make sure
	 * preceding writes reach the controller before starting to
	 * eat away the timeout.
	 */
	timeout = jiffies + (timeout_msec * HZ) / 1000;

	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
		msleep(interval_msec);
		tmp = ioread32(reg);
	}

	return tmp;
}

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Tejun Heo 已提交
7035 7036 7037 7038 7039 7040 7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062 7063 7064 7065 7066
/*
 * 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,
};

7067 7068 7069 7070
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

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/*
 * libata is essentially a library of internal helper functions for
 * low-level ATA host controller drivers.  As such, the API/ABI is
 * likely to change as new drivers are added and updated.
 * Do not depend on ABI/API stability.
 */

7078 7079 7080
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
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7081
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7082
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
7085
EXPORT_SYMBOL_GPL(ata_host_init);
7086
EXPORT_SYMBOL_GPL(ata_host_alloc);
7087
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7088
EXPORT_SYMBOL_GPL(ata_host_start);
7089
EXPORT_SYMBOL_GPL(ata_host_register);
7090
EXPORT_SYMBOL_GPL(ata_host_activate);
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7091
EXPORT_SYMBOL_GPL(ata_host_detach);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
7094
EXPORT_SYMBOL_GPL(ata_hsm_move);
7095
EXPORT_SYMBOL_GPL(ata_qc_complete);
7096
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
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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);
7102
EXPORT_SYMBOL_GPL(sata_print_link_status);
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EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
7109
EXPORT_SYMBOL_GPL(ata_sff_port_start);
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7110
EXPORT_SYMBOL_GPL(ata_interrupt);
7111
EXPORT_SYMBOL_GPL(ata_do_set_mode);
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Tejun Heo 已提交
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EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
7114
EXPORT_SYMBOL_GPL(ata_qc_prep);
7115
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7116
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
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EXPORT_SYMBOL_GPL(ata_bmdma_setup);
EXPORT_SYMBOL_GPL(ata_bmdma_start);
EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
EXPORT_SYMBOL_GPL(ata_bmdma_status);
EXPORT_SYMBOL_GPL(ata_bmdma_stop);
7122 7123 7124 7125 7126
EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
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EXPORT_SYMBOL_GPL(ata_port_probe);
7128
EXPORT_SYMBOL_GPL(ata_dev_disable);
7129
EXPORT_SYMBOL_GPL(sata_set_spd);
7130 7131
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
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EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
7135
EXPORT_SYMBOL_GPL(ata_std_prereset);
7136
EXPORT_SYMBOL_GPL(ata_std_softreset);
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7137
EXPORT_SYMBOL_GPL(sata_link_hardreset);
7138 7139
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
7140 7141
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
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7142
EXPORT_SYMBOL_GPL(ata_port_disable);
7143
EXPORT_SYMBOL_GPL(ata_ratelimit);
7144
EXPORT_SYMBOL_GPL(ata_wait_register);
7145
EXPORT_SYMBOL_GPL(ata_busy_sleep);
7146
EXPORT_SYMBOL_GPL(ata_wait_ready);
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7147
EXPORT_SYMBOL_GPL(ata_port_queue_task);
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Linus Torvalds 已提交
7148 7149 7150
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7151
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7152
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
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7153
EXPORT_SYMBOL_GPL(ata_host_intr);
7154 7155 7156 7157
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);
7158 7159
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
7160
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
7161 7162
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
7163
#endif /* CONFIG_PM */
7164 7165
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
7166
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_scsi_simulate);

7169
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
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7170 7171 7172
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

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Linus Torvalds 已提交
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#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
7175
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
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Tejun Heo 已提交
7176
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7177
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
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EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7180
#ifdef CONFIG_PM
7181 7182
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
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Jens Axboe 已提交
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EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7185
#endif /* CONFIG_PM */
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7186 7187
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
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Linus Torvalds 已提交
7188
#endif /* CONFIG_PCI */
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Jens Axboe 已提交
7189

T
Tejun Heo 已提交
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EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7193 7194 7195 7196
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
7197
EXPORT_SYMBOL_GPL(ata_eng_timeout);
7198
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7199
EXPORT_SYMBOL_GPL(ata_link_abort);
7200
EXPORT_SYMBOL_GPL(ata_port_abort);
7201 7202 7203
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7204 7205
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
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Tejun Heo 已提交
7206
EXPORT_SYMBOL_GPL(ata_do_eh);
7207
EXPORT_SYMBOL_GPL(ata_irq_on);
A
Akira Iguchi 已提交
7208
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
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Alan Cox 已提交
7209 7210 7211 7212 7213

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