libata-core.c 169.6 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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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/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/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.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/byteorder.h>
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#include <linux/cdrom.h>
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#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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const struct ata_port_operations ata_base_port_ops = {
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	.prereset		= ata_std_prereset,
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	.postreset		= ata_std_postreset,
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	.error_handler		= ata_std_error_handler,
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};

const struct ata_port_operations sata_port_ops = {
	.inherits		= &ata_base_port_ops,

	.qc_defer		= ata_std_qc_defer,
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	.hardreset		= sata_std_hardreset,
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};

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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
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static unsigned int ata_dev_set_feature(struct ata_device *dev,
					u8 enable, u8 feature);
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static void ata_dev_xfermask(struct ata_device *dev);
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static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
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unsigned int ata_print_id = 1;
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static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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struct ata_force_param {
	const char	*name;
	unsigned int	cbl;
	int		spd_limit;
	unsigned long	xfer_mask;
	unsigned int	horkage_on;
	unsigned int	horkage_off;
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	unsigned int	lflags;
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};

struct ata_force_ent {
	int			port;
	int			device;
	struct ata_force_param	param;
};

static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;

static char ata_force_param_buf[PAGE_SIZE] __initdata;
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/* param_buf is thrown away after initialization, disallow read */
module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
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MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");

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

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

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

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

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

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

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int libata_noacpi = 0;
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module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");

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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_link_next - link iteration helper
 *	@link: the previous link, NULL to start
 *	@ap: ATA port containing links to iterate
 *	@mode: iteration mode, one of ATA_LITER_*
 *
 *	LOCKING:
 *	Host lock or EH context.
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 *
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 *	RETURNS:
 *	Pointer to the next link.
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 */
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struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
			       enum ata_link_iter_mode mode)
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{
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	BUG_ON(mode != ATA_LITER_EDGE &&
	       mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);

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	/* NULL link indicates start of iteration */
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	if (!link)
		switch (mode) {
		case ATA_LITER_EDGE:
		case ATA_LITER_PMP_FIRST:
			if (sata_pmp_attached(ap))
				return ap->pmp_link;
			/* fall through */
		case ATA_LITER_HOST_FIRST:
			return &ap->link;
		}
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	/* we just iterated over the host link, what's next? */
	if (link == &ap->link)
		switch (mode) {
		case ATA_LITER_HOST_FIRST:
			if (sata_pmp_attached(ap))
				return ap->pmp_link;
			/* fall through */
		case ATA_LITER_PMP_FIRST:
			if (unlikely(ap->slave_link))
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				return ap->slave_link;
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			/* fall through */
		case ATA_LITER_EDGE:
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			return NULL;
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		}
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	/* slave_link excludes PMP */
	if (unlikely(link == ap->slave_link))
		return NULL;

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	/* we were over a PMP link */
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	if (++link < ap->pmp_link + ap->nr_pmp_links)
		return link;
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	if (mode == ATA_LITER_PMP_FIRST)
		return &ap->link;

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	return NULL;
}

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/**
 *	ata_dev_next - device iteration helper
 *	@dev: the previous device, NULL to start
 *	@link: ATA link containing devices to iterate
 *	@mode: iteration mode, one of ATA_DITER_*
 *
 *	LOCKING:
 *	Host lock or EH context.
 *
 *	RETURNS:
 *	Pointer to the next device.
 */
struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
				enum ata_dev_iter_mode mode)
{
	BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
	       mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);

	/* NULL dev indicates start of iteration */
	if (!dev)
		switch (mode) {
		case ATA_DITER_ENABLED:
		case ATA_DITER_ALL:
			dev = link->device;
			goto check;
		case ATA_DITER_ENABLED_REVERSE:
		case ATA_DITER_ALL_REVERSE:
			dev = link->device + ata_link_max_devices(link) - 1;
			goto check;
		}

 next:
	/* move to the next one */
	switch (mode) {
	case ATA_DITER_ENABLED:
	case ATA_DITER_ALL:
		if (++dev < link->device + ata_link_max_devices(link))
			goto check;
		return NULL;
	case ATA_DITER_ENABLED_REVERSE:
	case ATA_DITER_ALL_REVERSE:
		if (--dev >= link->device)
			goto check;
		return NULL;
	}

 check:
	if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
	    !ata_dev_enabled(dev))
		goto next;
	return dev;
}

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/**
 *	ata_dev_phys_link - find physical link for a device
 *	@dev: ATA device to look up physical link for
 *
 *	Look up physical link which @dev is attached to.  Note that
 *	this is different from @dev->link only when @dev is on slave
 *	link.  For all other cases, it's the same as @dev->link.
 *
 *	LOCKING:
 *	Don't care.
 *
 *	RETURNS:
 *	Pointer to the found physical link.
 */
struct ata_link *ata_dev_phys_link(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	if (!ap->slave_link)
		return dev->link;
	if (!dev->devno)
		return &ap->link;
	return ap->slave_link;
}

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/**
 *	ata_force_cbl - force cable type according to libata.force
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 *	@ap: ATA port of interest
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 *
 *	Force cable type according to libata.force and whine about it.
 *	The last entry which has matching port number is used, so it
 *	can be specified as part of device force parameters.  For
 *	example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
 *	same effect.
 *
 *	LOCKING:
 *	EH context.
 */
void ata_force_cbl(struct ata_port *ap)
{
	int i;

	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];

		if (fe->port != -1 && fe->port != ap->print_id)
			continue;

		if (fe->param.cbl == ATA_CBL_NONE)
			continue;

		ap->cbl = fe->param.cbl;
		ata_port_printk(ap, KERN_NOTICE,
				"FORCE: cable set to %s\n", fe->param.name);
		return;
	}
}

/**
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 *	ata_force_link_limits - force link limits according to libata.force
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 *	@link: ATA link of interest
 *
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 *	Force link flags and SATA spd limit according to libata.force
 *	and whine about it.  When only the port part is specified
 *	(e.g. 1:), the limit applies to all links connected to both
 *	the host link and all fan-out ports connected via PMP.  If the
 *	device part is specified as 0 (e.g. 1.00:), it specifies the
 *	first fan-out link not the host link.  Device number 15 always
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 *	points to the host link whether PMP is attached or not.  If the
 *	controller has slave link, device number 16 points to it.
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 *
 *	LOCKING:
 *	EH context.
 */
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static void ata_force_link_limits(struct ata_link *link)
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{
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	bool did_spd = false;
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	int linkno = link->pmp;
	int i;
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	if (ata_is_host_link(link))
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		linkno += 15;
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	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];

		if (fe->port != -1 && fe->port != link->ap->print_id)
			continue;

		if (fe->device != -1 && fe->device != linkno)
			continue;

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		/* only honor the first spd limit */
		if (!did_spd && fe->param.spd_limit) {
			link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
			ata_link_printk(link, KERN_NOTICE,
					"FORCE: PHY spd limit set to %s\n",
					fe->param.name);
			did_spd = true;
		}
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		/* let lflags stack */
		if (fe->param.lflags) {
			link->flags |= fe->param.lflags;
			ata_link_printk(link, KERN_NOTICE,
					"FORCE: link flag 0x%x forced -> 0x%x\n",
					fe->param.lflags, link->flags);
		}
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	}
}

/**
 *	ata_force_xfermask - force xfermask according to libata.force
 *	@dev: ATA device of interest
 *
 *	Force xfer_mask according to libata.force and whine about it.
 *	For consistency with link selection, device number 15 selects
 *	the first device connected to the host link.
 *
 *	LOCKING:
 *	EH context.
 */
static void ata_force_xfermask(struct ata_device *dev)
{
	int devno = dev->link->pmp + dev->devno;
	int alt_devno = devno;
	int i;

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	/* allow n.15/16 for devices attached to host port */
	if (ata_is_host_link(dev->link))
		alt_devno += 15;
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	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];
		unsigned long pio_mask, mwdma_mask, udma_mask;

		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
			continue;

		if (fe->device != -1 && fe->device != devno &&
		    fe->device != alt_devno)
			continue;

		if (!fe->param.xfer_mask)
			continue;

		ata_unpack_xfermask(fe->param.xfer_mask,
				    &pio_mask, &mwdma_mask, &udma_mask);
		if (udma_mask)
			dev->udma_mask = udma_mask;
		else if (mwdma_mask) {
			dev->udma_mask = 0;
			dev->mwdma_mask = mwdma_mask;
		} else {
			dev->udma_mask = 0;
			dev->mwdma_mask = 0;
			dev->pio_mask = pio_mask;
		}

		ata_dev_printk(dev, KERN_NOTICE,
			"FORCE: xfer_mask set to %s\n", fe->param.name);
		return;
	}
}

/**
 *	ata_force_horkage - force horkage according to libata.force
 *	@dev: ATA device of interest
 *
 *	Force horkage according to libata.force and whine about it.
 *	For consistency with link selection, device number 15 selects
 *	the first device connected to the host link.
 *
 *	LOCKING:
 *	EH context.
 */
static void ata_force_horkage(struct ata_device *dev)
{
	int devno = dev->link->pmp + dev->devno;
	int alt_devno = devno;
	int i;

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	/* allow n.15/16 for devices attached to host port */
	if (ata_is_host_link(dev->link))
		alt_devno += 15;
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	for (i = 0; i < ata_force_tbl_size; i++) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];

		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
			continue;

		if (fe->device != -1 && fe->device != devno &&
		    fe->device != alt_devno)
			continue;

		if (!(~dev->horkage & fe->param.horkage_on) &&
		    !(dev->horkage & fe->param.horkage_off))
			continue;

		dev->horkage |= fe->param.horkage_on;
		dev->horkage &= ~fe->param.horkage_off;

		ata_dev_printk(dev, KERN_NOTICE,
			"FORCE: horkage modified (%s)\n", fe->param.name);
	}
}

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/**
 *	atapi_cmd_type - Determine ATAPI command type from SCSI opcode
 *	@opcode: SCSI opcode
 *
 *	Determine ATAPI command type from @opcode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
 */
int atapi_cmd_type(u8 opcode)
{
	switch (opcode) {
	case GPCMD_READ_10:
	case GPCMD_READ_12:
		return ATAPI_READ;

	case GPCMD_WRITE_10:
	case GPCMD_WRITE_12:
	case GPCMD_WRITE_AND_VERIFY_10:
		return ATAPI_WRITE;

	case GPCMD_READ_CD:
	case GPCMD_READ_CD_MSF:
		return ATAPI_READ_CD;

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	case ATA_16:
	case ATA_12:
		if (atapi_passthru16)
			return ATAPI_PASS_THRU;
		/* fall thru */
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	default:
		return ATAPI_MISC;
	}
}

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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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/**
629
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
630 631
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
633
 *	Examine the device configuration and tf->flags to calculate
634
 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
639
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;
655
		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;
692
			block |= (u64)tf->hob_lbal << 24;
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		} 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;

739
	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.
 */
850 851 852
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
853 854 855 856 857 858
{
	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.
 */
869 870
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
871 872 873 874 875 876 877 878 879
{
	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;
}

880
static const struct ata_xfer_ent {
881
	int shift, bits;
882 883
	u8 base;
} ata_xfer_tbl[] = {
884 885 886
	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
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	{ -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:
901
 *	Matching XFER_* value, 0xff if no match found.
902
 */
903
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
904 905 906 907 908 909 910
{
	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;
911
	return 0xff;
912 913 914 915 916 917 918 919 920 921 922 923 924 925
}

/**
 *	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.
 */
926
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
927 928 929 930 931
{
	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)
932 933
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
	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.
 */
949
int ata_xfer_mode2shift(unsigned long xfer_mode)
950 951 952 953 954 955 956 957 958
{
	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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/**
960 961
 *	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
964
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
971
 *	@mode_mask, or the constant C string "<n/a>".
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 */
973
const char *ata_mode_string(unsigned long xfer_mask)
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{
975 976 977 978 979 980
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
981 982
		"PIO5",
		"PIO6",
983 984 985
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
986 987
		"MWDMA3",
		"MWDMA4",
988 989 990 991 992 993 994 995 996
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
997
	int highbit;
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999 1000 1001
	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>";
}

1005 1006 1007 1008 1009
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1010
		"6.0 Gbps",
1011 1012 1013 1014 1015 1016 1017
	};

	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)
1019
{
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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");
1023
		ata_acpi_on_disable(dev);
1024 1025
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
1026 1027 1028 1029
		dev->class++;
	}
}

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
{
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
	u32 scontrol;
	unsigned int err_mask;
	int rc;

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

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

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

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

1086 1087 1088 1089 1090
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
1091 1092 1093 1094 1095 1096 1097 1098 1099
		break;
	case NOT_AVAILABLE:
	case MAX_PERFORMANCE:
		/* disable all IPM transitions */
		scontrol |= (0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

1100 1101 1102 1103 1104
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
		break;
	}

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

	return 0;
}

/**
 *	ata_dev_enable_pm - enable SATA interface power management
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 *	@dev:  device to enable power management
 *	@policy: the link power management policy
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
 *
 *	Enable SATA Interface power management.  This will enable
 *	Device Interface Power Management (DIPM) for min_power
 * 	policy, and then call driver specific callbacks for
 *	enabling Host Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: -EINVAL if IPM is not supported, 0 otherwise.
 */
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
{
	int rc = 0;
	struct ata_port *ap = dev->link->ap;

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

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

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#ifdef CONFIG_PM
1148 1149
/**
 *	ata_dev_disable_pm - disable SATA interface power management
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 *	@dev: device to disable power management
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
 *
 *	Disable SATA Interface power management.  This will disable
 *	Device Interface Power Management (DIPM) without changing
 * 	policy,  call driver specific callbacks for disabling Host
 * 	Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: void
 */
static void ata_dev_disable_pm(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	ata_dev_set_dipm(dev, MAX_PERFORMANCE);
	if (ap->ops->disable_pm)
		ap->ops->disable_pm(ap);
}
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#endif	/* CONFIG_PM */
1169 1170 1171 1172

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1173
	ap->link.eh_info.action |= ATA_EH_LPM;
1174 1175 1176 1177
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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#ifdef CONFIG_PM
1179 1180 1181 1182 1183 1184 1185 1186 1187
static void ata_lpm_enable(struct ata_host *host)
{
	struct ata_link *link;
	struct ata_port *ap;
	struct ata_device *dev;
	int i;

	for (i = 0; i < host->n_ports; i++) {
		ap = host->ports[i];
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		ata_for_each_link(link, ap, EDGE) {
			ata_for_each_dev(dev, link, ALL)
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
				ata_dev_disable_pm(dev);
		}
	}
}

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

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		ata_lpm_schedule(ap, ap->pm_policy);
	}
}
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#endif	/* CONFIG_PM */
1205

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/**
 *	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:
1218 1219
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
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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.
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
L
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	 */
1241
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1246
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1251 1252 1253 1254 1255 1256
	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
		DPRINTK("found PMP device by sig\n");
		return ATA_DEV_PMP;
	}

	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1257
		printk(KERN_INFO "ata: SEMB device ignored\n");
1258 1259 1260
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

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

/**
1266
 *	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.
 */

1280 1281
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
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1282 1283 1284
{
	unsigned int c;

1285 1286
	BUG_ON(len & 1);

L
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1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

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

		ofs++;
		len -= 2;
	}
}

1301
/**
1302
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1303 1304 1305 1306 1307
 *	@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.
 *
1308
 *	This function is identical to ata_id_string except that it
1309 1310 1311 1312 1313 1314
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1315 1316
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1317 1318 1319
{
	unsigned char *p;

1320
	ata_id_string(id, s, ofs, len - 1);
1321 1322 1323 1324 1325 1326

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
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];
	}
}

1343
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
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{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1349
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
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	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1354
	return sectors;
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}

1357
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
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{
	u64 sectors = 0;

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

1366
	return sectors;
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}

/**
1370 1371 1372
 *	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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 *
1374 1375
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
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 *
1377 1378 1379
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
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 */
1381
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
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{
1383
	unsigned int err_mask;
A
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1384
	struct ata_taskfile tf;
1385
	int lba48 = ata_id_has_lba48(dev->id);
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	ata_tf_init(dev, &tf);

1389
	/* always clear all address registers */
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	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1392 1393 1394 1395 1396
	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;
1399 1400
	tf.device |= ATA_LBA;

1401
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1402 1403 1404 1405 1406 1407 1408
	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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1410
	if (lba48)
1411
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1412
	else
1413
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1414
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1415
		(*max_sectors)--;
1416
	return 0;
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}

/**
1420 1421
 *	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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 *
1424 1425 1426 1427 1428 1429
 *	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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1431
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
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1432
{
1433
	unsigned int err_mask;
A
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1434
	struct ata_taskfile tf;
1435
	int lba48 = ata_id_has_lba48(dev->id);
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1436 1437 1438 1439 1440 1441

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1442 1443 1444 1445 1446 1447 1448 1449

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

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
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1450
	} else {
1451 1452
		tf.command = ATA_CMD_SET_MAX;

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1453 1454 1455
		tf.device |= (new_sectors >> 24) & 0xf;
	}

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	tf.protocol |= ATA_PROT_NODATA;
1457
	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;

1463
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
	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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 */
T
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1487
static int ata_hpa_resize(struct ata_device *dev)
A
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1488
{
T
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1489 1490 1491 1492
	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;
1493
	int rc;
J
Jeff Garzik 已提交
1494

T
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1495 1496 1497 1498
	/* 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))
1499
		return 0;
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T
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1501 1502 1503
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
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1504 1505
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1506
		 */
T
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1507
		if (rc == -EACCES || !ata_ignore_hpa) {
T
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1508
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1509
				       "broken, skipping HPA handling\n");
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1510 1511 1512 1513 1514
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
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1515
		}
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1516

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1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
		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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1570 1571
}

L
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1572 1573
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1574
 *	@id: IDENTIFY DEVICE page to dump
L
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1575
 *
1576 1577
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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1578 1579 1580 1581 1582
 *
 *	LOCKING:
 *	caller.
 */

1583
static inline void ata_dump_id(const u16 *id)
L
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1584 1585 1586 1587 1588 1589
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1590 1591 1592 1593 1594
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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1595 1596 1597 1598 1599
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1600 1601 1602 1603 1604
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
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1605 1606
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1607 1608
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1609 1610
}

1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
/**
 *	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
 */
1626
unsigned long ata_id_xfermask(const u16 *id)
1627
{
1628
	unsigned long pio_mask, mwdma_mask, udma_mask;
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639

	/* 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.
		 */
1640
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1641
		if (mode < 5)	/* Valid PIO range */
1642
			pio_mask = (2 << mode) - 1;
1643 1644
		else
			pio_mask = 1;
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654

		/* 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;
1655

1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
	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);
	}

1673 1674 1675
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1676 1677 1678 1679

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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1680
/**
1681
 *	ata_pio_queue_task - Queue port_task
T
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1682
 *	@ap: The ata_port to queue port_task for
1683
 *	@data: data for @fn to use
1684
 *	@delay: delay time in msecs for workqueue function
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1685 1686 1687 1688 1689 1690 1691
 *
 *	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
1692
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
T
Tejun Heo 已提交
1693 1694 1695 1696 1697
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
1698
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1699
{
1700
	ap->port_task_data = data;
T
Tejun Heo 已提交
1701

1702
	/* may fail if ata_port_flush_task() in progress */
1703
	queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
T
Tejun Heo 已提交
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
}

/**
 *	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");

1720
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1721

1722
	if (ata_msg_ctl(ap))
1723
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
T
Tejun Heo 已提交
1724 1725
}

1726
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1727
{
1728
	struct completion *waiting = qc->private_data;
1729 1730 1731 1732 1733

	complete(waiting);
}

/**
1734
 *	ata_exec_internal_sg - execute libata internal command
1735 1736
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1737
 *	@cdb: CDB for packet command
1738
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1739
 *	@sgl: sg list for the data buffer of the command
1740
 *	@n_elem: Number of sg entries
1741
 *	@timeout: Timeout in msecs (0 for default)
1742 1743 1744 1745 1746 1747 1748 1749 1750
 *
 *	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.
1751 1752 1753
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1754
 */
1755 1756
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1757
			      int dma_dir, struct scatterlist *sgl,
1758
			      unsigned int n_elem, unsigned long timeout)
1759
{
T
Tejun Heo 已提交
1760 1761
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1762
	u8 command = tf->command;
1763
	int auto_timeout = 0;
1764
	struct ata_queued_cmd *qc;
1765
	unsigned int tag, preempted_tag;
1766
	u32 preempted_sactive, preempted_qc_active;
1767
	int preempted_nr_active_links;
1768
	DECLARE_COMPLETION_ONSTACK(wait);
1769
	unsigned long flags;
1770
	unsigned int err_mask;
1771
	int rc;
1772

1773
	spin_lock_irqsave(ap->lock, flags);
1774

1775
	/* no internal command while frozen */
1776
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1777
		spin_unlock_irqrestore(ap->lock, flags);
1778 1779 1780
		return AC_ERR_SYSTEM;
	}

1781
	/* initialize internal qc */
1782

1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
	/* 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;

1793 1794
	if (test_and_set_bit(tag, &ap->qc_allocated))
		BUG();
1795
	qc = __ata_qc_from_tag(ap, tag);
1796 1797 1798 1799 1800 1801 1802

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

T
Tejun Heo 已提交
1803 1804
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1805
	preempted_qc_active = ap->qc_active;
1806
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1807 1808
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1809
	ap->qc_active = 0;
1810
	ap->nr_active_links = 0;
1811 1812

	/* prepare & issue qc */
1813
	qc->tf = *tf;
1814 1815
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1816
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1817 1818
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1819
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1820
		struct scatterlist *sg;
1821

J
Jens Axboe 已提交
1822 1823
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1824

J
Jens Axboe 已提交
1825
		ata_sg_init(qc, sgl, n_elem);
1826
		qc->nbytes = buflen;
1827 1828
	}

1829
	qc->private_data = &wait;
1830 1831
	qc->complete_fn = ata_qc_complete_internal;

1832
	ata_qc_issue(qc);
1833

1834
	spin_unlock_irqrestore(ap->lock, flags);
1835

1836 1837 1838 1839 1840 1841 1842 1843
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1844 1845

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1846 1847

	ata_port_flush_task(ap);
1848

1849
	if (!rc) {
1850
		spin_lock_irqsave(ap->lock, flags);
1851 1852 1853

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1854 1855
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1856
		 */
1857
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1858 1859 1860 1861 1862 1863
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1864

1865 1866
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1867
					"qc timeout (cmd 0x%x)\n", command);
1868 1869
		}

1870
		spin_unlock_irqrestore(ap->lock, flags);
1871 1872
	}

1873 1874 1875 1876
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1877 1878 1879 1880 1881 1882 1883 1884 1885 1886
	/* 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;
1887 1888
	}

1889
	/* finish up */
1890
	spin_lock_irqsave(ap->lock, flags);
1891

1892
	*tf = qc->result_tf;
1893 1894 1895
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1896 1897
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1898
	ap->qc_active = preempted_qc_active;
1899
	ap->nr_active_links = preempted_nr_active_links;
1900

1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	/* 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.
	 */
1912
	if (ap->flags & ATA_FLAG_DISABLED) {
1913 1914 1915 1916
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1917
	spin_unlock_irqrestore(ap->lock, flags);
1918

1919 1920 1921
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1922
	return err_mask;
1923 1924
}

1925
/**
1926
 *	ata_exec_internal - execute libata internal command
1927 1928 1929 1930 1931 1932
 *	@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
1933
 *	@timeout: Timeout in msecs (0 for default)
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945
 *
 *	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,
1946 1947
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1948
{
1949 1950
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1951

1952 1953 1954 1955 1956 1957
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1958

1959 1960
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1961 1962
}

1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
/**
 *	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
1976
 */
1977
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1978 1979 1980 1981 1982 1983 1984 1985 1986
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1987
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1988 1989
}

1990 1991 1992 1993 1994 1995 1996
/**
 *	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
1997

1998 1999
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
2000 2001
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
2002
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
2003
		return 0;
2004 2005 2006 2007
	/* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
	if (ata_id_is_cfa(adev->id)
	    && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
		return 0;
A
Alan Cox 已提交
2008 2009 2010 2011 2012
	/* 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))
2013
		return 1;
A
Alan Cox 已提交
2014 2015
	return 0;
}
2016

A
Alan Cox 已提交
2017 2018 2019 2020 2021 2022 2023
/**
 *	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
2024

A
Alan Cox 已提交
2025 2026
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
2027 2028
	/* 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
2029
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
2030 2031 2032 2033
		/* 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
2034 2035
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
2036 2037
		}
	}
A
Alan Cox 已提交
2038
	return 3 << ATA_SHIFT_PIO;
2039 2040
}

2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057
/**
 *	ata_do_dev_read_id		-	default ID read method
 *	@dev: device
 *	@tf: proposed taskfile
 *	@id: data buffer
 *
 *	Issue the identify taskfile and hand back the buffer containing
 *	identify data. For some RAID controllers and for pre ATA devices
 *	this function is wrapped or replaced by the driver
 */
unsigned int ata_do_dev_read_id(struct ata_device *dev,
					struct ata_taskfile *tf, u16 *id)
{
	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
}

L
Linus Torvalds 已提交
2058
/**
2059 2060 2061
 *	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)
2062
 *	@flags: ATA_READID_* flags
2063
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
2064
 *
2065 2066
 *	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
2067 2068
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
2069
 *
2070
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2071
 *	now we abort if we hit that case.
2072
 *
L
Linus Torvalds 已提交
2073
 *	LOCKING:
2074 2075 2076 2077
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2078
 */
2079
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2080
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
2081
{
T
Tejun Heo 已提交
2082
	struct ata_port *ap = dev->link->ap;
2083
	unsigned int class = *p_class;
2084
	struct ata_taskfile tf;
2085 2086
	unsigned int err_mask = 0;
	const char *reason;
2087
	int may_fallback = 1, tried_spinup = 0;
2088
	int rc;
L
Linus Torvalds 已提交
2089

2090
	if (ata_msg_ctl(ap))
2091
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2092

2093
retry:
T
Tejun Heo 已提交
2094
	ata_tf_init(dev, &tf);
2095

2096 2097
	switch (class) {
	case ATA_DEV_ATA:
2098
		tf.command = ATA_CMD_ID_ATA;
2099 2100
		break;
	case ATA_DEV_ATAPI:
2101
		tf.command = ATA_CMD_ID_ATAPI;
2102 2103 2104 2105 2106
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
2107 2108
	}

2109
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
2110 2111 2112 2113 2114 2115 2116 2117 2118 2119

	/* 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
2120

2121 2122 2123 2124 2125
	if (ap->ops->read_id)
		err_mask = ap->ops->read_id(dev, &tf, id);
	else
		err_mask = ata_do_dev_read_id(dev, &tf, id);

2126
	if (err_mask) {
2127
		if (err_mask & AC_ERR_NODEV_HINT) {
2128 2129
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
2130 2131 2132
			return -ENOENT;
		}

2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			/* 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) {
				may_fallback = 0;

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

			/* Control reaches here iff the device aborted
			 * both flavors of IDENTIFYs which happens
			 * sometimes with phantom devices.
			 */
			ata_dev_printk(dev, KERN_DEBUG,
				       "both IDENTIFYs aborted, assuming NODEV\n");
			return -ENOENT;
2156 2157
		}

2158 2159
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
2160 2161 2162
		goto err_out;
	}

2163 2164 2165 2166 2167
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

2168
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
2169

2170
	/* sanity check */
2171
	rc = -EINVAL;
A
Alan Cox 已提交
2172
	reason = "device reports invalid type";
2173 2174 2175 2176 2177 2178 2179

	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;
2180 2181
	}

2182 2183 2184 2185 2186 2187 2188
	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.
		 */
2189
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2190
		if (err_mask && id[2] != 0x738c) {
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
			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;
	}

2203
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2204 2205 2206
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2207 2208
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2209 2210
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2211 2212 2213
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2214 2215
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2216
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2217 2218 2219 2220 2221 2222 2223 2224 2225
			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.
			 */
2226
			flags &= ~ATA_READID_POSTRESET;
2227 2228 2229 2230 2231
			goto retry;
		}
	}

	*p_class = class;
2232

2233 2234 2235
	return 0;

 err_out:
T
Tejun Heo 已提交
2236
	if (ata_msg_warn(ap))
2237
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2238
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2239 2240 2241
	return rc;
}

T
Tejun Heo 已提交
2242
static inline u8 ata_dev_knobble(struct ata_device *dev)
2243
{
T
Tejun Heo 已提交
2244
	struct ata_port *ap = dev->link->ap;
2245 2246 2247 2248

	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
		return 0;

T
Tejun Heo 已提交
2249
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2250 2251
}

2252 2253 2254
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2255
	struct ata_port *ap = dev->link->ap;
2256 2257 2258 2259 2260 2261
	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
2262
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2263 2264 2265
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2266
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2267
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2268 2269 2270 2271 2272 2273 2274 2275 2276
		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);
}

2277
/**
2278 2279 2280 2281 2282
 *	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.
2283 2284
 *
 *	LOCKING:
2285 2286 2287 2288
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2289
 */
2290
int ata_dev_configure(struct ata_device *dev)
2291
{
T
Tejun Heo 已提交
2292 2293
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2294
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2295
	const u16 *id = dev->id;
2296
	unsigned long xfer_mask;
2297
	char revbuf[7];		/* XYZ-99\0 */
2298 2299
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2300
	int rc;
2301

2302
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2303
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2304
			       __func__);
2305
		return 0;
2306 2307
	}

2308
	if (ata_msg_probe(ap))
2309
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2310

T
Tejun Heo 已提交
2311 2312
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2313
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2314

2315 2316 2317 2318 2319 2320 2321
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2322 2323 2324 2325 2326 2327 2328 2329 2330 2331
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_WARNING,
			"WARNING: ATAPI is %s, device ignored.\n",
			atapi_enabled ? "not supported with this driver"
				      : "disabled");
		ata_dev_disable(dev);
		return 0;
	}

T
Tejun Heo 已提交
2332 2333 2334 2335
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2336

T
Tejun Heo 已提交
2337 2338 2339 2340 2341
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2342
	/* print device capabilities */
2343
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2344 2345 2346
		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",
2347
			       __func__,
2348 2349
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2350

2351
	/* initialize to-be-configured parameters */
2352
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2353 2354 2355 2356 2357 2358 2359
	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
2360 2361 2362 2363
	/*
	 * common ATA, ATAPI feature tests
	 */

2364
	/* find max transfer mode; for printk only */
2365
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2366

2367 2368
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2369

2370 2371 2372 2373 2374 2375 2376
	/* 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
2377 2378
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2379 2380
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
2381 2382 2383
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2384
			snprintf(revbuf, 7, "CFA");
2385
		} else {
2386
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2387 2388 2389 2390 2391 2392
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
		}
2393

2394
		dev->n_sectors = ata_id_n_sectors(id);
2395

2396 2397 2398
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

2399
		if (ata_id_has_lba(id)) {
2400
			const char *lba_desc;
2401
			char ncq_desc[20];
2402

2403 2404
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2405
			if (ata_id_has_lba48(id)) {
2406
				dev->flags |= ATA_DFLAG_LBA48;
2407
				lba_desc = "LBA48";
2408 2409 2410 2411

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2412
			}
2413

2414 2415 2416
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2417
			/* print device info to dmesg */
2418 2419 2420 2421 2422 2423 2424
			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",
2425
					(unsigned long long)dev->n_sectors,
2426 2427
					dev->multi_count, lba_desc, ncq_desc);
			}
2428
		} else {
2429 2430 2431
			/* CHS */

			/* Default translation */
2432 2433 2434
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2435

2436
			if (ata_id_current_chs_valid(id)) {
2437
				/* Current CHS translation is valid. */
2438 2439 2440
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2441 2442 2443
			}

			/* print device info to dmesg */
2444
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2445
				ata_dev_printk(dev, KERN_INFO,
2446 2447 2448
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2449
				ata_dev_printk(dev, KERN_INFO,
2450 2451 2452 2453 2454
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2455 2456
		}

2457
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2458 2459 2460
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2461
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2462 2463
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2464
		const char *dma_dir_string = "";
2465
		u32 sntf;
2466

2467
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2468
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2469
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2470 2471
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2472
			rc = -EINVAL;
L
Linus Torvalds 已提交
2473 2474
			goto err_out_nosup;
		}
2475
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2476

2477 2478 2479 2480
		/* Enable ATAPI AN if both the host and device have
		 * the support.  If PMP is attached, SNTF is required
		 * to enable ATAPI AN to discern between PHY status
		 * changed notifications and ATAPI ANs.
2481
		 */
2482
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2483
		    (!sata_pmp_attached(ap) ||
2484
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2485 2486
			unsigned int err_mask;

2487
			/* issue SET feature command to turn this on */
2488 2489
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2490
			if (err_mask)
2491
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2492 2493 2494
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2495
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2496 2497
				atapi_an_string = ", ATAPI AN";
			}
2498 2499
		}

2500
		if (ata_id_cdb_intr(dev->id)) {
2501
			dev->flags |= ATA_DFLAG_CDB_INTR;
2502 2503
			cdb_intr_string = ", CDB intr";
		}
2504

2505 2506 2507 2508 2509
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2510
		/* print device info to dmesg */
2511
		if (ata_msg_drv(ap) && print_info)
2512
			ata_dev_printk(dev, KERN_INFO,
2513
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2514
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2515
				       ata_mode_string(xfer_mask),
2516 2517
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2518 2519
	}

2520 2521 2522 2523 2524
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2525 2526 2527 2528 2529 2530 2531
	if (!(dev->horkage & ATA_HORKAGE_IPM)) {
		if (ata_id_has_hipm(dev->id))
			dev->flags |= ATA_DFLAG_HIPM;
		if (ata_id_has_dipm(dev->id))
			dev->flags |= ATA_DFLAG_DIPM;
	}

2532 2533
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2534
	if (ata_dev_knobble(dev)) {
2535
		if (ata_msg_drv(ap) && print_info)
2536 2537
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2538
		dev->udma_mask &= ATA_UDMA5;
2539 2540 2541
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2542
	if ((dev->class == ATA_DEV_ATAPI) &&
2543
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2544
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2545 2546
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2547

T
Tejun Heo 已提交
2548
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2549 2550
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2551

2552 2553 2554 2555 2556 2557 2558
	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
		dev->horkage |= ATA_HORKAGE_IPM;

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

2559
	if (ap->ops->dev_config)
2560
		ap->ops->dev_config(dev);
2561

2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
	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. Do this after the dev_config call as some controllers
		   with buggy firmware may want to avoid reporting false device
		   bugs */

		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");
		}
	}

2577 2578 2579 2580 2581 2582 2583
	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
		ata_dev_printk(dev, KERN_WARNING, "WARNING: device requires "
			       "firmware update to be fully functional.\n");
		ata_dev_printk(dev, KERN_WARNING, "         contact the vendor "
			       "or visit http://ata.wiki.kernel.org.\n");
	}

2584
	return 0;
L
Linus Torvalds 已提交
2585 2586

err_out_nosup:
2587
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2588
		ata_dev_printk(dev, KERN_DEBUG,
2589
			       "%s: EXIT, err\n", __func__);
2590
	return rc;
L
Linus Torvalds 已提交
2591 2592
}

A
Alan Cox 已提交
2593
/**
2594
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2595 2596
 *	@ap: port
 *
2597
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2598 2599 2600 2601 2602 2603 2604 2605 2606
 *	detection.
 */

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

/**
2607
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2608 2609
 *	@ap: port
 *
2610
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630
 *	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;
}

T
Tejun Heo 已提交
2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642
/**
 *	ata_cable_ignore	-	return ignored PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which don't use cable type to limit
 *	transfer mode.
 */
int ata_cable_ignore(struct ata_port *ap)
{
	return ATA_CBL_PATA_IGN;
}

A
Alan Cox 已提交
2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654
/**
 *	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
2655 2656 2657 2658
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2659 2660 2661 2662
 *	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
2663
 *	LOCKING:
J
Jeff Garzik 已提交
2664
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2665 2666
 *
 *	RETURNS:
2667
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2668 2669
 */

2670
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2671
{
2672
	unsigned int classes[ATA_MAX_DEVICES];
2673
	int tries[ATA_MAX_DEVICES];
2674
	int rc;
2675
	struct ata_device *dev;
L
Linus Torvalds 已提交
2676

2677
	ata_port_probe(ap);
2678

T
Tejun Heo 已提交
2679
	ata_for_each_dev(dev, &ap->link, ALL)
2680
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2681 2682

 retry:
T
Tejun Heo 已提交
2683
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701
		/* If we issue an SRST then an ATA drive (not ATAPI)
		 * may change configuration and be in PIO0 timing. If
		 * we do a hard reset (or are coming from power on)
		 * this is true for ATA or ATAPI. Until we've set a
		 * suitable controller mode we should not touch the
		 * bus as we may be talking too fast.
		 */
		dev->pio_mode = XFER_PIO_0;

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

2702
	/* reset and determine device classes */
2703
	ap->ops->phy_reset(ap);
2704

T
Tejun Heo 已提交
2705
	ata_for_each_dev(dev, &ap->link, ALL) {
2706 2707 2708 2709 2710
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2711

2712
		dev->class = ATA_DEV_UNKNOWN;
2713
	}
L
Linus Torvalds 已提交
2714

2715
	ata_port_probe(ap);
2716

2717 2718 2719 2720
	/* 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 */

T
Tejun Heo 已提交
2721
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2722 2723
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2724

2725
		if (!ata_dev_enabled(dev))
2726 2727
			continue;

2728 2729
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2730 2731
		if (rc)
			goto fail;
2732 2733
	}

A
Alan Cox 已提交
2734 2735 2736 2737
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

T
Tejun Heo 已提交
2738 2739 2740 2741 2742 2743
	/* We may have SATA bridge glue hiding here irrespective of
	 * the reported cable types and sensed types.  When SATA
	 * drives indicate we have a bridge, we don't know which end
	 * of the link the bridge is which is a problem.
	 */
	ata_for_each_dev(dev, &ap->link, ENABLED)
A
Alan Cox 已提交
2744 2745 2746
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2747 2748 2749
	/* 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 */

T
Tejun Heo 已提交
2750
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2751
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2752
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2753
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2754 2755
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2756 2757
	}

2758
	/* configure transfer mode */
2759
	rc = ata_set_mode(&ap->link, &dev);
2760
	if (rc)
2761
		goto fail;
L
Linus Torvalds 已提交
2762

T
Tejun Heo 已提交
2763 2764
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2765

2766 2767
	/* no device present, disable port */
	ata_port_disable(ap);
2768
	return -ENODEV;
2769 2770

 fail:
2771 2772
	tries[dev->devno]--;

2773 2774
	switch (rc) {
	case -EINVAL:
2775
		/* eeek, something went very wrong, give up */
2776 2777
		tries[dev->devno] = 0;
		break;
2778 2779 2780 2781

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2782
	case -EIO:
2783 2784 2785 2786
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2787
			sata_down_spd_limit(&ap->link);
2788 2789
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2790 2791
	}

2792
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2793
		ata_dev_disable(dev);
2794

2795
	goto retry;
L
Linus Torvalds 已提交
2796 2797 2798
}

/**
J
Jeff Garzik 已提交
2799 2800
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2801
 *
J
Jeff Garzik 已提交
2802 2803 2804
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2805
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2806
 *	serialization.
L
Linus Torvalds 已提交
2807 2808 2809 2810
 */

void ata_port_probe(struct ata_port *ap)
{
2811
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2812 2813
}

2814 2815
/**
 *	sata_print_link_status - Print SATA link status
2816
 *	@link: SATA link to printk link status about
2817 2818 2819 2820 2821 2822
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2823
static void sata_print_link_status(struct ata_link *link)
2824
{
2825
	u32 sstatus, scontrol, tmp;
2826

2827
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2828
		return;
2829
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2830

T
Tejun Heo 已提交
2831
	if (ata_phys_link_online(link)) {
2832
		tmp = (sstatus >> 4) & 0xf;
2833
		ata_link_printk(link, KERN_INFO,
2834 2835
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2836
	} else {
2837
		ata_link_printk(link, KERN_INFO,
2838 2839
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2840 2841 2842
	}
}

2843 2844 2845 2846 2847 2848 2849
/**
 *	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
 */
2850

T
Tejun Heo 已提交
2851
struct ata_device *ata_dev_pair(struct ata_device *adev)
2852
{
T
Tejun Heo 已提交
2853 2854
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2855
	if (!ata_dev_enabled(pair))
2856 2857 2858 2859
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2860
/**
J
Jeff Garzik 已提交
2861 2862
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2863
 *
J
Jeff Garzik 已提交
2864 2865 2866 2867 2868
 *	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
2869
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2870
 *	serialization.
L
Linus Torvalds 已提交
2871 2872 2873 2874
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2875 2876
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2877
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2878 2879
}

2880
/**
2881
 *	sata_down_spd_limit - adjust SATA spd limit downward
2882
 *	@link: Link to adjust SATA spd limit for
2883
 *
2884
 *	Adjust SATA spd limit of @link downward.  Note that this
2885
 *	function only adjusts the limit.  The change must be applied
2886
 *	using sata_set_spd().
2887 2888 2889 2890 2891 2892 2893
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2894
int sata_down_spd_limit(struct ata_link *link)
2895
{
2896 2897
	u32 sstatus, spd, mask;
	int rc, highbit;
2898

2899
	if (!sata_scr_valid(link))
2900 2901 2902
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2903
	 * If not, use cached value in link->sata_spd.
2904
	 */
2905
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2906 2907 2908
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2909
		spd = link->sata_spd;
2910

2911
	mask = link->sata_spd_limit;
2912 2913
	if (mask <= 1)
		return -EINVAL;
2914 2915

	/* unconditionally mask off the highest bit */
2916 2917 2918
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2919 2920 2921 2922 2923 2924 2925 2926 2927
	/* 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? */
2928 2929 2930
	if (!mask)
		return -EINVAL;

2931
	link->sata_spd_limit = mask;
2932

2933
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2934
			sata_spd_string(fls(mask)));
2935 2936 2937 2938

	return 0;
}

2939
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2940
{
2941 2942
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2943

2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954
	limit = link->sata_spd_limit;

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

	if (limit == UINT_MAX)
		target = 0;
2955
	else
2956
		target = fls(limit);
2957 2958

	spd = (*scontrol >> 4) & 0xf;
2959
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2960

2961
	return spd != target;
2962 2963 2964
}

/**
2965
 *	sata_set_spd_needed - is SATA spd configuration needed
2966
 *	@link: Link in question
2967 2968
 *
 *	Test whether the spd limit in SControl matches
2969
 *	@link->sata_spd_limit.  This function is used to determine
2970 2971 2972 2973 2974 2975 2976 2977 2978
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
A
Adrian Bunk 已提交
2979
static int sata_set_spd_needed(struct ata_link *link)
2980 2981 2982
{
	u32 scontrol;

2983
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2984
		return 1;
2985

2986
	return __sata_set_spd_needed(link, &scontrol);
2987 2988 2989
}

/**
2990
 *	sata_set_spd - set SATA spd according to spd limit
2991
 *	@link: Link to set SATA spd for
2992
 *
2993
 *	Set SATA spd of @link according to sata_spd_limit.
2994 2995 2996 2997 2998 2999
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
3000
 *	changed.  Negative errno if SCR registers are inaccessible.
3001
 */
3002
int sata_set_spd(struct ata_link *link)
3003 3004
{
	u32 scontrol;
3005
	int rc;
3006

3007
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3008
		return rc;
3009

3010
	if (!__sata_set_spd_needed(link, &scontrol))
3011 3012
		return 0;

3013
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3014 3015
		return rc;

3016 3017 3018
	return 1;
}

A
Alan Cox 已提交
3019 3020 3021 3022 3023
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
3024
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
3025
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3026 3027 3028
 * 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
3029 3030 3031
 */

static const struct ata_timing ata_timing[] = {
3032 3033 3034 3035 3036 3037 3038 3039
/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
A
Alan Cox 已提交
3040

3041 3042 3043
	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
A
Alan Cox 已提交
3044

3045 3046 3047
	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
3048
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
3049
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
A
Alan Cox 已提交
3050 3051

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
3052 3053 3054 3055 3056 3057 3058
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
A
Alan Cox 已提交
3059 3060 3061 3062

	{ 0xFF }
};

3063 3064
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090

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);
}

3091
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
3092
{
3093 3094 3095 3096
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
3097

3098 3099 3100
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
3101 3102 3103 3104 3105 3106 3107 3108 3109
}

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;

	/*
3110
	 * Find the mode.
3111
	 */
A
Alan Cox 已提交
3112 3113 3114 3115

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

3116 3117
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
3118 3119 3120 3121 3122 3123 3124
	/*
	 * 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));
3125
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
3126 3127
			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];
3128
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
3129 3130 3131 3132 3133 3134 3135 3136 3137
			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.
	 */

3138
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3139 3140

	/*
3141 3142 3143
	 * 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
3144 3145
	 */

3146
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3147 3148 3149 3150 3151
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3152
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
	 */

	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
3164

3165 3166 3167 3168 3169
	/* 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
3170 3171 3172 3173

	return 0;
}

3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
/**
 *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
 *	@xfer_shift: ATA_SHIFT_* value for transfer type to examine.
 *	@cycle: cycle duration in ns
 *
 *	Return matching xfer mode for @cycle.  The returned mode is of
 *	the transfer type specified by @xfer_shift.  If @cycle is too
 *	slow for @xfer_shift, 0xff is returned.  If @cycle is faster
 *	than the fastest known mode, the fasted mode is returned.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mode, 0xff if no match found.
 */
u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
{
	u8 base_mode = 0xff, last_mode = 0xff;
	const struct ata_xfer_ent *ent;
	const struct ata_timing *t;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (ent->shift == xfer_shift)
			base_mode = ent->base;

	for (t = ata_timing_find_mode(base_mode);
	     t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
		unsigned short this_cycle;

		switch (xfer_shift) {
		case ATA_SHIFT_PIO:
		case ATA_SHIFT_MWDMA:
			this_cycle = t->cycle;
			break;
		case ATA_SHIFT_UDMA:
			this_cycle = t->udma;
			break;
		default:
			return 0xff;
		}

		if (cycle > this_cycle)
			break;

		last_mode = t->mode;
	}

	return last_mode;
}

3225 3226 3227
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3228
 *	@sel: ATA_DNXFER_* selector
3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239
 *
 *	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
 */
3240
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3241
{
3242
	char buf[32];
3243 3244
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3245
	int quiet, highbit;
3246

3247 3248
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3249

3250 3251 3252 3253
	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);
3254

3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306
	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);
	}
3307 3308 3309 3310 3311 3312 3313

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

	return 0;
}

T
Tejun Heo 已提交
3314
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3315
{
T
Tejun Heo 已提交
3316
	struct ata_eh_context *ehc = &dev->link->eh_context;
3317 3318
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3319 3320
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
3321

3322
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3323 3324 3325
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
3326
	err_mask = ata_dev_set_xfermode(dev);
3327

3328 3329 3330 3331 3332 3333 3334 3335 3336 3337
	if (err_mask & ~AC_ERR_DEV)
		goto fail;

	/* revalidate */
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
	if (rc)
		return rc;

3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352
	if (dev->xfer_shift == ATA_SHIFT_PIO) {
		/* Old CFA may refuse this command, which is just fine */
		if (ata_id_is_cfa(dev->id))
			ign_dev_err = 1;
		/* Catch several broken garbage emulations plus some pre
		   ATA devices */
		if (ata_id_major_version(dev->id) == 0 &&
					dev->pio_mode <= XFER_PIO_2)
			ign_dev_err = 1;
		/* 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 (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
			ign_dev_err = 1;
	}
3353 3354
	/* Early MWDMA devices do DMA but don't allow DMA mode setting.
	   Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3355
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3356 3357
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3358
		ign_dev_err = 1;
3359

3360 3361 3362
	/* if the device is actually configured correctly, ignore dev err */
	if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
		ign_dev_err = 1;
L
Linus Torvalds 已提交
3363

3364 3365 3366 3367 3368 3369
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3370

3371 3372
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3373

3374 3375 3376 3377
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3378
	return 0;
3379 3380 3381 3382 3383

 fail:
	ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
		       "(err_mask=0x%x)\n", err_mask);
	return -EIO;
L
Linus Torvalds 已提交
3384 3385 3386
}

/**
3387
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3388
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3389
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3390
 *
3391 3392 3393
 *	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
3394
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3395
 *
L
Linus Torvalds 已提交
3396
 *	LOCKING:
J
Jeff Garzik 已提交
3397
 *	PCI/etc. bus probe sem.
3398 3399 3400
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3401
 */
3402

3403
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3404
{
3405
	struct ata_port *ap = link->ap;
3406
	struct ata_device *dev;
3407
	int rc = 0, used_dma = 0, found = 0;
3408

3409
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3410
	ata_for_each_dev(dev, link, ENABLED) {
3411
		unsigned long pio_mask, dma_mask;
3412
		unsigned int mode_mask;
3413

3414 3415 3416 3417 3418 3419
		mode_mask = ATA_DMA_MASK_ATA;
		if (dev->class == ATA_DEV_ATAPI)
			mode_mask = ATA_DMA_MASK_ATAPI;
		else if (ata_id_is_cfa(dev->id))
			mode_mask = ATA_DMA_MASK_CFA;

T
Tejun Heo 已提交
3420
		ata_dev_xfermask(dev);
3421
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3422

3423 3424
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3425 3426 3427 3428 3429 3430

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

3431 3432
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3433

3434
		found = 1;
3435
		if (ata_dma_enabled(dev))
3436
			used_dma = 1;
3437
	}
3438
	if (!found)
3439
		goto out;
3440 3441

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3442
	ata_for_each_dev(dev, link, ENABLED) {
3443
		if (dev->pio_mode == 0xff) {
3444
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3445
			rc = -EINVAL;
3446
			goto out;
3447 3448 3449 3450 3451 3452 3453
		}

		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
3454

3455
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3456 3457
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3458 3459 3460 3461 3462 3463 3464
			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
3465 3466

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3467
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3468
		rc = ata_dev_set_mode(dev);
3469
		if (rc)
3470
			goto out;
3471
	}
L
Linus Torvalds 已提交
3472

3473 3474
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3475
	 */
J
Jeff Garzik 已提交
3476
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3477
		ap->host->simplex_claimed = ap;
3478

3479 3480 3481 3482
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3483 3484
}

3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508
/**
 *	ata_wait_ready - wait for link to become ready
 *	@link: link to be waited on
 *	@deadline: deadline jiffies for the operation
 *	@check_ready: callback to check link readiness
 *
 *	Wait for @link to become ready.  @check_ready should return
 *	positive number if @link is ready, 0 if it isn't, -ENODEV if
 *	link doesn't seem to be occupied, other errno for other error
 *	conditions.
 *
 *	Transient -ENODEV conditions are allowed for
 *	ATA_TMOUT_FF_WAIT.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 if @linke is ready before @deadline; otherwise, -errno.
 */
int ata_wait_ready(struct ata_link *link, unsigned long deadline,
		   int (*check_ready)(struct ata_link *link))
{
	unsigned long start = jiffies;
3509
	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3510 3511
	int warned = 0;

T
Tejun Heo 已提交
3512 3513 3514 3515 3516 3517
	/* Slave readiness can't be tested separately from master.  On
	 * M/S emulation configuration, this function should be called
	 * only on the master and it will handle both master and slave.
	 */
	WARN_ON(link == link->ap->slave_link);

3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579
	if (time_after(nodev_deadline, deadline))
		nodev_deadline = deadline;

	while (1) {
		unsigned long now = jiffies;
		int ready, tmp;

		ready = tmp = check_ready(link);
		if (ready > 0)
			return 0;

		/* -ENODEV could be transient.  Ignore -ENODEV if link
		 * is online.  Also, some SATA devices take a long
		 * time to clear 0xff after reset.  For example,
		 * HHD424020F7SV00 iVDR needs >= 800ms while Quantum
		 * GoVault needs even more than that.  Wait for
		 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
		 *
		 * Note that some PATA controllers (pata_ali) explode
		 * if status register is read more than once when
		 * there's no device attached.
		 */
		if (ready == -ENODEV) {
			if (ata_link_online(link))
				ready = 0;
			else if ((link->ap->flags & ATA_FLAG_SATA) &&
				 !ata_link_offline(link) &&
				 time_before(now, nodev_deadline))
				ready = 0;
		}

		if (ready)
			return ready;
		if (time_after(now, deadline))
			return -EBUSY;

		if (!warned && time_after(now, start + 5 * HZ) &&
		    (deadline - now > 3 * HZ)) {
			ata_link_printk(link, KERN_WARNING,
				"link is slow to respond, please be patient "
				"(ready=%d)\n", tmp);
			warned = 1;
		}

		msleep(50);
	}
}

/**
 *	ata_wait_after_reset - wait for link to become ready after reset
 *	@link: link to be waited on
 *	@deadline: deadline jiffies for the operation
 *	@check_ready: callback to check link readiness
 *
 *	Wait for @link to become ready after reset.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 if @linke is ready before @deadline; otherwise, -errno.
 */
3580
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3581 3582
				int (*check_ready)(struct ata_link *link))
{
3583
	msleep(ATA_WAIT_AFTER_RESET);
3584 3585 3586 3587

	return ata_wait_ready(link, deadline, check_ready);
}

3588
/**
3589 3590
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3591
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3592
 *	@deadline: deadline jiffies for the operation
3593
 *
3594
*	Make sure SStatus of @link reaches stable state, determined by
3595 3596
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3597 3598
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3599 3600
 *	until timeout then returns 0 if DET is stable at 1.
 *
3601 3602 3603
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3604 3605 3606 3607 3608 3609
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3610 3611
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3612
{
3613 3614
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3615
	unsigned long last_jiffies, t;
3616 3617 3618
	u32 last, cur;
	int rc;

3619
	t = ata_deadline(jiffies, params[2]);
3620 3621 3622
	if (time_before(t, deadline))
		deadline = t;

3623
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3624 3625 3626 3627 3628 3629 3630
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3631
		msleep(interval);
3632
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3633 3634 3635 3636 3637
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3638
			if (cur == 1 && time_before(jiffies, deadline))
3639
				continue;
3640 3641
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3642 3643 3644 3645 3646 3647 3648 3649
				return 0;
			continue;
		}

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

3650 3651 3652
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3653
		if (time_after(jiffies, deadline))
3654
			return -EPIPE;
3655 3656 3657 3658
	}
}

/**
3659 3660
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3661
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3662
 *	@deadline: deadline jiffies for the operation
3663
 *
3664
 *	Resume SATA phy @link and debounce it.
3665 3666 3667 3668 3669 3670 3671
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3672 3673
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3674
{
3675
	u32 scontrol, serror;
3676 3677
	int rc;

3678
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3679
		return rc;
3680

3681
	scontrol = (scontrol & 0x0f0) | 0x300;
3682

3683
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3684
		return rc;
3685

3686 3687 3688 3689
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3690

3691 3692 3693
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3694
	/* clear SError, some PHYs require this even for SRST to work */
3695 3696 3697
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3698
	return rc != -EINVAL ? rc : 0;
3699 3700
}

3701
/**
3702
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3703
 *	@link: ATA link to be reset
3704
 *	@deadline: deadline jiffies for the operation
3705
 *
T
Tejun Heo 已提交
3706
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3707 3708 3709 3710
 *	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.
3711 3712 3713 3714 3715 3716 3717
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3718
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3719
{
T
Tejun Heo 已提交
3720
	struct ata_port *ap = link->ap;
3721
	struct ata_eh_context *ehc = &link->eh_context;
3722
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3723 3724 3725 3726 3727 3728
	int rc;

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

3729
	/* if SATA, resume link */
3730
	if (ap->flags & ATA_FLAG_SATA) {
3731
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3732 3733
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3734
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3735 3736 3737
					"link for reset (errno=%d)\n", rc);
	}

3738
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3739
	if (ata_phys_link_offline(link))
3740 3741
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3742 3743 3744
	return 0;
}

3745
/**
T
Tejun Heo 已提交
3746 3747 3748
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3749
 *	@deadline: deadline jiffies for the operation
3750 3751
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3752
 *
T
Tejun Heo 已提交
3753
 *	SATA phy-reset @link using DET bits of SControl register.
3754 3755 3756 3757 3758 3759 3760 3761
 *	After hardreset, link readiness is waited upon using
 *	ata_wait_ready() if @check_ready is specified.  LLDs are
 *	allowed to not specify @check_ready and wait itself after this
 *	function returns.  Device classification is LLD's
 *	responsibility.
 *
 *	*@online is set to one iff reset succeeded and @link is online
 *	after reset.
3762 3763 3764 3765 3766 3767 3768
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3769
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3770 3771
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3772
{
T
Tejun Heo 已提交
3773
	u32 scontrol;
3774
	int rc;
3775

3776 3777
	DPRINTK("ENTER\n");

3778 3779 3780
	if (online)
		*online = false;

3781
	if (sata_set_spd_needed(link)) {
3782 3783 3784 3785 3786
		/* 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.
		 */
3787
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3788
			goto out;
3789

3790
		scontrol = (scontrol & 0x0f0) | 0x304;
3791

3792
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3793
			goto out;
3794

3795
		sata_set_spd(link);
3796 3797 3798
	}

	/* issue phy wake/reset */
3799
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3800
		goto out;
3801

3802
	scontrol = (scontrol & 0x0f0) | 0x301;
3803

3804
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3805
		goto out;
3806

3807
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3808 3809 3810 3811
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3812 3813
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3814 3815 3816
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3817
	if (ata_phys_link_offline(link))
3818 3819 3820 3821 3822 3823
		goto out;

	/* Link is online.  From this point, -ENODEV too is an error. */
	if (online)
		*online = true;

T
Tejun Heo 已提交
3824
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3825 3826 3827 3828 3829 3830 3831 3832
		/* If PMP is supported, we have to do follow-up SRST.
		 * Some PMPs don't send D2H Reg FIS after hardreset if
		 * the first port is empty.  Wait only for
		 * ATA_TMOUT_PMP_SRST_WAIT.
		 */
		if (check_ready) {
			unsigned long pmp_deadline;

3833 3834
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845
			if (time_after(pmp_deadline, deadline))
				pmp_deadline = deadline;
			ata_wait_ready(link, pmp_deadline, check_ready);
		}
		rc = -EAGAIN;
		goto out;
	}

	rc = 0;
	if (check_ready)
		rc = ata_wait_ready(link, deadline, check_ready);
3846
 out:
3847 3848 3849 3850
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3851 3852
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3853
	}
3854 3855 3856 3857
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883
/**
 *	sata_std_hardreset - COMRESET w/o waiting or classification
 *	@link: link to reset
 *	@class: resulting class of attached device
 *	@deadline: deadline jiffies for the operation
 *
 *	Standard SATA COMRESET w/o waiting or classification.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 if link offline, -EAGAIN if link online, -errno on errors.
 */
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
		       unsigned long deadline)
{
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
	bool online;
	int rc;

	/* do hardreset */
	rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
	return online ? -EAGAIN : rc;
}

3884
/**
3885
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3886
 *	@link: the target ata_link
3887 3888 3889 3890 3891 3892 3893 3894 3895
 *	@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)
 */
3896
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3897
{
3898 3899
	u32 serror;

3900 3901
	DPRINTK("ENTER\n");

3902 3903 3904 3905
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3906
	/* print link status */
3907
	sata_print_link_status(link);
3908 3909 3910 3911

	DPRINTK("EXIT\n");
}

3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927
/**
 *	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
3928 3929
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3930 3931
{
	const u16 *old_id = dev->id;
3932 3933
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3934 3935

	if (dev->class != new_class) {
3936 3937
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3938 3939 3940
		return 0;
	}

3941 3942 3943 3944
	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]));
3945 3946

	if (strcmp(model[0], model[1])) {
3947 3948
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3949 3950 3951 3952
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3953 3954
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3955 3956 3957 3958 3959 3960 3961
		return 0;
	}

	return 1;
}

/**
3962
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3963
 *	@dev: target ATA device
3964
 *	@readid_flags: read ID flags
3965 3966 3967 3968 3969 3970 3971 3972 3973 3974
 *
 *	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
 */
3975
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3976
{
3977
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3978
	u16 *id = (void *)dev->link->ap->sector_buf;
3979 3980
	int rc;

3981
	/* read ID data */
3982
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3983
	if (rc)
3984
		return rc;
3985 3986

	/* is the device still there? */
3987 3988
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3989

3990
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3991 3992 3993 3994 3995 3996
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3997
 *	@new_class: new class code
3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008
 *	@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
 */
4009 4010
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4011
{
4012
	u64 n_sectors = dev->n_sectors;
4013 4014 4015 4016 4017
	int rc;

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

4018 4019 4020 4021 4022 4023 4024 4025 4026
	/* 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;
	}

4027 4028 4029 4030
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4031 4032

	/* configure device according to the new ID */
4033
	rc = ata_dev_configure(dev);
4034 4035 4036 4037
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4038 4039
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
4040 4041 4042 4043
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
4044 4045 4046 4047

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

4048 4049 4050 4051 4052
		rc = -ENODEV;
		goto fail;
	}

	return 0;
4053 4054

 fail:
4055
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4056 4057 4058
	return rc;
}

4059 4060 4061 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
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 },
4095
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4096
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4097
	/* Odd clown on sil3726/4726 PMPs */
4098
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4099

4100
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4101
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4102
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4103

4104 4105 4106 4107
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4108
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4109
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4110 4111
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4112
	/* NCQ is broken */
4113
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4114
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4115
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4116
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4117
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4118

4119
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4120
	{ "ST31500341AS",	"SD15",		ATA_HORKAGE_NONCQ |
4121
						ATA_HORKAGE_FIRMWARE_WARN },
4122
	{ "ST31500341AS",	"SD16",		ATA_HORKAGE_NONCQ |
4123
						ATA_HORKAGE_FIRMWARE_WARN },
4124
	{ "ST31500341AS",	"SD17",		ATA_HORKAGE_NONCQ |
4125
						ATA_HORKAGE_FIRMWARE_WARN },
4126
	{ "ST31500341AS",	"SD18",		ATA_HORKAGE_NONCQ |
4127
						ATA_HORKAGE_FIRMWARE_WARN },
4128
	{ "ST31500341AS",	"SD19",		ATA_HORKAGE_NONCQ |
4129
						ATA_HORKAGE_FIRMWARE_WARN },
4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183

	{ "ST31000333AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST31000333AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST31000333AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST31000333AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST31000333AS",	"SD19",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },

	{ "ST3640623AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640623AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640623AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640623AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640623AS",	"SD19",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },

	{ "ST3640323AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640323AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640323AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640323AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3640323AS",	"SD19",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },

	{ "ST3320813AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320813AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320813AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320813AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320813AS",	"SD19",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },

	{ "ST3320613AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD19",		ATA_HORKAGE_NONCQ |
4184 4185
						ATA_HORKAGE_FIRMWARE_WARN },

4186 4187 4188 4189 4190
	/* 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, },
4191

4192 4193 4194 4195 4196
	/* 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 },
4197

4198 4199 4200
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4201
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4202

A
Alan Cox 已提交
4203 4204
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4205 4206 4207
	/* Maybe we should just blacklist TSSTcorp... */
	{ "TSSTcorp CDDVDW SH-S202H", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202H", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4208
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4209 4210 4211
	{ "TSSTcorp CDDVDW SH-S202J", "SB01",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4212

4213 4214 4215
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4216 4217
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4218
};
4219

4220
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4221 4222 4223 4224 4225 4226 4227 4228 4229 4230
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4231
	else {
4232
		len = strlen(name);
4233 4234 4235 4236 4237 4238
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4239 4240 4241 4242

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4243
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4244
{
T
Tejun Heo 已提交
4245 4246
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4247
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4248

T
Tejun Heo 已提交
4249 4250
	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
4251

4252
	while (ad->model_num) {
4253
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4254 4255
			if (ad->model_rev == NULL)
				return ad->horkage;
4256
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4257
				return ad->horkage;
4258
		}
4259
		ad++;
4260
	}
L
Linus Torvalds 已提交
4261 4262 4263
	return 0;
}

4264 4265 4266 4267 4268 4269
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
4270
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4271 4272
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4273
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4274 4275
}

A
Alan Cox 已提交
4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290
/**
 *	ata_is_40wire		-	check drive side detection
 *	@dev: device
 *
 *	Perform drive side detection decoding, allowing for device vendors
 *	who can't follow the documentation.
 */

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

4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308
/**
 *	cable_is_40wire		-	40/80/SATA decider
 *	@ap: port to consider
 *
 *	This function encapsulates the policy for speed management
 *	in one place. At the moment we don't cache the result but
 *	there is a good case for setting ap->cbl to the result when
 *	we are called with unknown cables (and figuring out if it
 *	impacts hotplug at all).
 *
 *	Return 1 if the cable appears to be 40 wire.
 */

static int cable_is_40wire(struct ata_port *ap)
{
	struct ata_link *link;
	struct ata_device *dev;

T
Tejun Heo 已提交
4309
	/* If the controller thinks we are 40 wire, we are. */
4310 4311
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4312 4313

	/* If the controller thinks we are 80 wire, we are. */
4314 4315
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4316 4317 4318 4319 4320

	/* If the system is known to be 40 wire short cable (eg
	 * laptop), then we allow 80 wire modes even if the drive
	 * isn't sure.
	 */
A
Alan Cox 已提交
4321 4322
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4323 4324 4325 4326 4327 4328 4329 4330 4331 4332

	/* If the controller doesn't know, we scan.
	 *
	 * Note: We look for all 40 wire detects at this point.  Any
	 *       80 wire detect is taken to be 80 wire cable because
	 * - in many setups only the one drive (slave if present) will
	 *   give a valid detect
	 * - if you have a non detect capable drive you don't want it
	 *   to colour the choice
	 */
T
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4333 4334 4335
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4336 4337 4338 4339 4340 4341
				return 0;
		}
	}
	return 1;
}

4342 4343 4344 4345
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4346 4347 4348 4349
 *	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...
4350 4351 4352 4353
 *
 *	LOCKING:
 *	None.
 */
T
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4354
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4355
{
T
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4356 4357
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4358
	struct ata_host *host = ap->host;
4359
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4360

4361
	/* controller modes available */
4362 4363 4364
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4365
	/* drive modes available */
4366 4367 4368
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4369

4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380
	/*
	 *	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));
	}

4381 4382
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4383 4384
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4385
	}
4386

4387
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4388
	    host->simplex_claimed && host->simplex_claimed != ap) {
4389 4390 4391
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4392
	}
4393

J
Jeff Garzik 已提交
4394 4395 4396
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4397
	if (ap->ops->mode_filter)
4398
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4399

4400 4401 4402 4403 4404 4405 4406 4407 4408 4409
	/* 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 */
4410
		if (cable_is_40wire(ap)) {
4411
			ata_dev_printk(dev, KERN_WARNING,
4412 4413 4414 4415
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4416 4417
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4418 4419 4420 4421 4422 4423
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4424 4425 4426
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4427
 *	LOCKING:
J
Jeff Garzik 已提交
4428
 *	PCI/etc. bus probe sem.
4429 4430 4431
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4432 4433
 */

T
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4434
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4435
{
4436
	struct ata_taskfile tf;
4437
	unsigned int err_mask;
L
Linus Torvalds 已提交
4438 4439 4440 4441

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

T
Tejun Heo 已提交
4442 4443 4444
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4445
	ata_tf_init(dev, &tf);
4446 4447
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4448
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4449
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4450
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4451 4452
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4453 4454
	/* If the device has IORDY and the controller does not - turn it off */
 	else if (ata_id_has_iordy(dev->id))
J
Jeff Garzik 已提交
4455
		tf.nsect = 0x01;
A
Alan Cox 已提交
4456 4457
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4458

4459
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4460 4461 4462 4463 4464

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4465
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4466 4467
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4468
 *	@feature: The sector count represents the feature to set
4469 4470
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4471
 *	on port @ap with sector count
4472 4473 4474 4475 4476 4477 4478
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4479 4480
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492
{
	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;
4493
	tf.nsect = feature;
4494

4495
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4496

4497 4498
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4499 4500
}

4501 4502 4503
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4504 4505
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4506 4507
 *
 *	LOCKING:
4508 4509 4510 4511
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4512
 */
T
Tejun Heo 已提交
4513 4514
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4515
{
4516
	struct ata_taskfile tf;
4517
	unsigned int err_mask;
4518 4519 4520

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4521
		return AC_ERR_INVALID;
4522 4523 4524 4525

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

T
Tejun Heo 已提交
4526
	ata_tf_init(dev, &tf);
4527 4528 4529 4530 4531
	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 */
4532

4533
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4534 4535 4536 4537 4538
	/* 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;
4539

4540 4541
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4542 4543
}

L
Linus Torvalds 已提交
4544
/**
J
Jeff Garzik 已提交
4545 4546 4547 4548
 *	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
4549 4550
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4551
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4552
 */
4553
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4554 4555
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4556
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4557 4558
	int dir = qc->dma_dir;

4559
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4560

4561
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4562

4563 4564
	if (qc->n_elem)
		dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
L
Linus Torvalds 已提交
4565 4566

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4567
	qc->sg = NULL;
L
Linus Torvalds 已提交
4568 4569 4570
}

/**
4571
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4572 4573
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4574 4575 4576 4577
 *	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
4578
 *	LOCKING:
T
Tejun Heo 已提交
4579 4580 4581 4582 4583
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4584
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4585 4586
{
	struct ata_port *ap = qc->ap;
4587

T
Tejun Heo 已提交
4588 4589 4590
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4591 4592
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4593
		return 1;
4594

T
Tejun Heo 已提交
4595 4596
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4597

T
Tejun Heo 已提交
4598 4599
	return 0;
}
L
Linus Torvalds 已提交
4600

T
Tejun Heo 已提交
4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618
/**
 *	ata_std_qc_defer - Check whether a qc needs to be deferred
 *	@qc: ATA command in question
 *
 *	Non-NCQ commands cannot run with any other command, NCQ or
 *	not.  As upper layer only knows the queue depth, we are
 *	responsible for maintaining exclusion.  This function checks
 *	whether a new command @qc can be issued.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	ATA_DEFER_* if deferring is needed, 0 otherwise.
 */
int ata_std_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_link *link = qc->dev->link;
4619

T
Tejun Heo 已提交
4620 4621 4622 4623 4624 4625 4626
	if (qc->tf.protocol == ATA_PROT_NCQ) {
		if (!ata_tag_valid(link->active_tag))
			return 0;
	} else {
		if (!ata_tag_valid(link->active_tag) && !link->sactive)
			return 0;
	}
4627

T
Tejun Heo 已提交
4628 4629
	return ATA_DEFER_LINK;
}
4630

T
Tejun Heo 已提交
4631
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4632

T
Tejun Heo 已提交
4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652
/**
 *	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:
 *	spin_lock_irqsave(host lock)
 */
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->sg = sg;
	qc->n_elem = n_elem;
	qc->cursg = qc->sg;
}
4653

T
Tejun Heo 已提交
4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670
/**
 *	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.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	Zero on success, negative on error.
 *
 */
static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int n_elem;
L
Linus Torvalds 已提交
4671

T
Tejun Heo 已提交
4672
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4673

T
Tejun Heo 已提交
4674 4675 4676
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4677

T
Tejun Heo 已提交
4678
	DPRINTK("%d sg elements mapped\n", n_elem);
4679

T
Tejun Heo 已提交
4680 4681
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4682

T
Tejun Heo 已提交
4683
	return 0;
L
Linus Torvalds 已提交
4684 4685
}

T
Tejun Heo 已提交
4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698
/**
 *	swap_buf_le16 - swap halves of 16-bit words in place
 *	@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:
 *	Inherited from caller.
 */
void swap_buf_le16(u16 *buf, unsigned int buf_words)
4699
{
T
Tejun Heo 已提交
4700 4701
#ifdef __BIG_ENDIAN
	unsigned int i;
4702

T
Tejun Heo 已提交
4703 4704 4705
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4706 4707
}

4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738
/**
 *	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:
 *	None.
 */

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

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

	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
			qc = __ata_qc_from_tag(ap, i);
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

L
Linus Torvalds 已提交
4739 4740 4741 4742 4743
/**
 *	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
4744
 *	None.
L
Linus Torvalds 已提交
4745 4746
 */

4747
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4748
{
T
Tejun Heo 已提交
4749
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4750 4751
	struct ata_queued_cmd *qc;

4752
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4753 4754 4755 4756 4757
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4758
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4759 4760 4761 4762 4763
	}

	return qc;
}

4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778
/**
 *	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:
 *	spin_lock_irqsave(host lock)
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4779
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4780 4781 4782 4783 4784 4785 4786 4787 4788

	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
		clear_bit(tag, &ap->qc_allocated);
	}
}

4789
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4790
{
4791
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4792
	struct ata_link *link = qc->dev->link;
4793

4794 4795
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4796 4797 4798 4799

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

4800
	/* command should be marked inactive atomically with qc completion */
4801
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4802
		link->sactive &= ~(1 << qc->tag);
4803 4804 4805
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4806
		link->active_tag = ATA_TAG_POISON;
4807 4808 4809 4810 4811 4812 4813
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4814

4815 4816 4817 4818 4819
	/* 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;
4820
	ap->qc_active &= ~(1 << qc->tag);
4821

L
Linus Torvalds 已提交
4822
	/* call completion callback */
4823
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4824 4825
}

4826 4827 4828 4829 4830
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4831
	ap->ops->qc_fill_rtf(qc);
4832 4833
}

4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

	if (ata_tag_internal(qc->tag))
		return;

	if (ata_is_nodata(qc->tf.protocol))
		return;

	if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
		return;

	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}

4850 4851 4852 4853 4854 4855 4856 4857
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
 *	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
4858
 *	spin_lock_irqsave(host lock)
4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877
 */
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) {
4878 4879 4880
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4881
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
4882 4883 4884 4885 4886 4887 4888

		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 */
4889
				fill_result_tf(qc);
4890 4891 4892 4893 4894 4895 4896
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4897
			fill_result_tf(qc);
4898

4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913
		/* Some commands need post-processing after successful
		 * completion.
		 */
		switch (qc->tf.command) {
		case ATA_CMD_SET_FEATURES:
			if (qc->tf.feature != SETFEATURES_WC_ON &&
			    qc->tf.feature != SETFEATURES_WC_OFF)
				break;
			/* fall through */
		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
		case ATA_CMD_SET_MULTI: /* multi_count changed */
			/* revalidate device */
			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
			ata_port_schedule_eh(ap);
			break;
4914 4915 4916 4917

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4918 4919
		}

4920 4921 4922
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4923 4924 4925 4926 4927 4928 4929
		__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)
4930
			fill_result_tf(qc);
4931 4932 4933 4934 4935

		__ata_qc_complete(qc);
	}
}

4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *
 *	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
4947
 *	spin_lock_irqsave(host lock)
4948 4949 4950 4951
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4952
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980
{
	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))) {
			ata_qc_complete(qc);
			nr_done++;
		}
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4981 4982 4983 4984 4985 4986 4987 4988 4989 4990
/**
 *	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
4991
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4992
 */
4993
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4994 4995
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4996
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
4997
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
4998

4999 5000 5001 5002
	/* 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.
	 */
5003
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5004

5005
	if (ata_is_ncq(prot)) {
5006
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5007 5008 5009

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5010
		link->sactive |= 1 << qc->tag;
5011
	} else {
5012
		WARN_ON_ONCE(link->sactive);
5013 5014

		ap->nr_active_links++;
T
Tejun Heo 已提交
5015
		link->active_tag = qc->tag;
5016 5017
	}

5018
	qc->flags |= ATA_QCFLAG_ACTIVE;
5019
	ap->qc_active |= 1 << qc->tag;
5020

5021 5022 5023
	/* We guarantee to LLDs that they will have at least one
	 * non-zero sg if the command is a data command.
	 */
T
Tejun Heo 已提交
5024
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5025

T
Tejun Heo 已提交
5026
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5027
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5028 5029
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
5030

T
Tejun Heo 已提交
5031
	/* if device is sleeping, schedule reset and abort the link */
5032
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5033
		link->eh_info.action |= ATA_EH_RESET;
5034 5035 5036 5037 5038
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5039 5040
	ap->ops->qc_prep(qc);

5041 5042 5043 5044
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5045

5046
sg_err:
5047 5048 5049
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5050 5051
}

5052 5053
/**
 *	sata_scr_valid - test whether SCRs are accessible
5054
 *	@link: ATA link to test SCR accessibility for
5055
 *
5056
 *	Test whether SCRs are accessible for @link.
5057 5058 5059 5060 5061 5062 5063
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5064
int sata_scr_valid(struct ata_link *link)
5065
{
5066 5067
	struct ata_port *ap = link->ap;

5068
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5069 5070 5071 5072
}

/**
 *	sata_scr_read - read SCR register of the specified port
5073
 *	@link: ATA link to read SCR for
5074 5075 5076
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5077
 *	Read SCR register @reg of @link into *@val.  This function is
5078 5079
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5080 5081
 *
 *	LOCKING:
5082
 *	None if @link is ap->link.  Kernel thread context otherwise.
5083 5084 5085 5086
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5087
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5088
{
5089 5090
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5091
			return link->ap->ops->scr_read(link, reg, val);
5092 5093 5094 5095
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5096 5097 5098 5099
}

/**
 *	sata_scr_write - write SCR register of the specified port
5100
 *	@link: ATA link to write SCR for
5101 5102 5103
 *	@reg: SCR to write
 *	@val: value to write
 *
5104
 *	Write @val to SCR register @reg of @link.  This function is
5105 5106
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5107 5108
 *
 *	LOCKING:
5109
 *	None if @link is ap->link.  Kernel thread context otherwise.
5110 5111 5112 5113
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5114
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5115
{
5116 5117
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5118
			return link->ap->ops->scr_write(link, reg, val);
5119 5120
		return -EOPNOTSUPP;
	}
5121

5122
	return sata_pmp_scr_write(link, reg, val);
5123 5124 5125 5126
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5127
 *	@link: ATA link to write SCR for
5128 5129 5130 5131 5132 5133 5134
 *	@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:
5135
 *	None if @link is ap->link.  Kernel thread context otherwise.
5136 5137 5138 5139
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5140
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5141
{
5142 5143
	if (ata_is_host_link(link)) {
		int rc;
5144

5145
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5146
			rc = link->ap->ops->scr_write(link, reg, val);
5147
			if (rc == 0)
T
Tejun Heo 已提交
5148
				rc = link->ap->ops->scr_read(link, reg, &val);
5149 5150 5151
			return rc;
		}
		return -EOPNOTSUPP;
5152
	}
5153 5154

	return sata_pmp_scr_write(link, reg, val);
5155 5156 5157
}

/**
T
Tejun Heo 已提交
5158
 *	ata_phys_link_online - test whether the given link is online
5159
 *	@link: ATA link to test
5160
 *
5161 5162 5163
 *	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).
5164 5165 5166 5167 5168
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5169
 *	True if the port online status is available and online.
5170
 */
T
Tejun Heo 已提交
5171
bool ata_phys_link_online(struct ata_link *link)
5172 5173 5174
{
	u32 sstatus;

5175 5176
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
5177 5178
		return true;
	return false;
5179 5180 5181
}

/**
T
Tejun Heo 已提交
5182
 *	ata_phys_link_offline - test whether the given link is offline
5183
 *	@link: ATA link to test
5184
 *
5185 5186 5187
 *	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).
5188 5189 5190 5191 5192
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5193
 *	True if the port offline status is available and offline.
5194
 */
T
Tejun Heo 已提交
5195
bool ata_phys_link_offline(struct ata_link *link)
5196 5197 5198
{
	u32 sstatus;

5199 5200
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
5201 5202
		return true;
	return false;
5203
}
E
Edward Falk 已提交
5204

T
Tejun Heo 已提交
5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256
/**
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
 *
 *	Test whether @link is online.  This is identical to
 *	ata_phys_link_online() when there's no slave link.  When
 *	there's a slave link, this function should only be called on
 *	the master link and will return true if any of M/S links is
 *	online.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	True if the port online status is available and online.
 */
bool ata_link_online(struct ata_link *link)
{
	struct ata_link *slave = link->ap->slave_link;

	WARN_ON(link == slave);	/* shouldn't be called on slave link */

	return ata_phys_link_online(link) ||
		(slave && ata_phys_link_online(slave));
}

/**
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
 *
 *	Test whether @link is offline.  This is identical to
 *	ata_phys_link_offline() when there's no slave link.  When
 *	there's a slave link, this function should only be called on
 *	the master link and will return true if both M/S links are
 *	offline.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	True if the port offline status is available and offline.
 */
bool ata_link_offline(struct ata_link *link)
{
	struct ata_link *slave = link->ap->slave_link;

	WARN_ON(link == slave);	/* shouldn't be called on slave link */

	return ata_phys_link_offline(link) &&
		(!slave || ata_phys_link_offline(slave));
}

5257
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5258 5259 5260
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5261 5262 5263 5264
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5265 5266
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5267
		struct ata_link *link;
5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286

		/* 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;
T
Tejun Heo 已提交
5287
		ata_for_each_link(link, ap, HOST_FIRST) {
5288 5289 5290
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308

		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
5309 5310
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5311 5312
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5313
 *	Suspend @host.  Actual operation is performed by EH.  This
5314 5315 5316 5317 5318 5319 5320 5321 5322
 *	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
5323
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5324
{
5325
	int rc;
5326

5327 5328 5329 5330 5331 5332
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5333
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5334 5335
	if (rc == 0)
		host->dev->power.power_state = mesg;
5336 5337 5338 5339
	return rc;
}

/**
J
Jeff Garzik 已提交
5340 5341
 *	ata_host_resume - resume host
 *	@host: host to resume
5342
 *
J
Jeff Garzik 已提交
5343
 *	Resume @host.  Actual operation is performed by EH.  This
5344 5345 5346 5347 5348 5349
 *	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
5350
void ata_host_resume(struct ata_host *host)
5351
{
T
Tejun Heo 已提交
5352
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5353
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5354
	host->dev->power.power_state = PMSG_ON;
5355 5356 5357

	/* reenable link pm */
	ata_lpm_disable(host);
5358
}
5359
#endif
5360

5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372
/**
 *	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.
 */
5373
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5374
{
5375
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5376

5377 5378
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5379 5380 5381 5382 5383 5384
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395
/**
 *	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
5396
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5397
	struct ata_port *ap = link->ap;
5398 5399
	unsigned long flags;

T
Tejun Heo 已提交
5400
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5401 5402
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5403

5404 5405
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5406
	 * host lock.
5407
	 */
5408
	spin_lock_irqsave(ap->lock, flags);
5409
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5410
	dev->horkage = 0;
5411
	spin_unlock_irqrestore(ap->lock, flags);
5412

5413 5414
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5415 5416 5417 5418 5419
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5420 5421 5422 5423
/**
 *	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
5424
 *	@pmp: Port multiplier port number
5425 5426 5427 5428 5429 5430
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5431
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5432 5433 5434 5435 5436 5437 5438
{
	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
5439
	link->pmp = pmp;
5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465
	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.
 */
5466
int sata_link_init_spd(struct ata_link *link)
5467
{
5468
	u8 spd;
5469 5470
	int rc;

T
Tejun Heo 已提交
5471
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5472 5473 5474
	if (rc)
		return rc;

T
Tejun Heo 已提交
5475
	spd = (link->saved_scontrol >> 4) & 0xf;
5476 5477 5478
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5479
	ata_force_link_limits(link);
5480

5481 5482 5483 5484 5485
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5486
/**
5487 5488
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5489
 *
5490 5491 5492 5493
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5494
 *
L
Linus Torvalds 已提交
5495
 *	LOCKING:
5496
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5497
 */
5498
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5499
{
5500
	struct ata_port *ap;
L
Linus Torvalds 已提交
5501

5502 5503 5504 5505 5506 5507
	DPRINTK("ENTER\n");

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

5508
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5509
	ap->lock = &host->lock;
5510
	ap->flags = ATA_FLAG_DISABLED;
5511
	ap->print_id = -1;
L
Linus Torvalds 已提交
5512
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5513
	ap->host = host;
5514
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5515
	ap->last_ctl = 0xFF;
5516 5517 5518 5519 5520 5521

#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
5522
#else
5523
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5524
#endif
L
Linus Torvalds 已提交
5525

T
Tejun Heo 已提交
5526
#ifdef CONFIG_ATA_SFF
5527
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5528 5529
#else
	INIT_DELAYED_WORK(&ap->port_task, NULL);
T
Tejun Heo 已提交
5530
#endif
5531 5532
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5533
	INIT_LIST_HEAD(&ap->eh_done_q);
5534
	init_waitqueue_head(&ap->eh_wait_q);
5535
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5536 5537 5538
	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
5539

5540 5541
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5542
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5543 5544 5545 5546 5547 5548 5549 5550

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

5551 5552 5553 5554 5555
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5556 5557 5558
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5559 5560 5561 5562
		if (!ap)
			continue;

		if (ap->scsi_host)
5563 5564
			scsi_host_put(ap->scsi_host);

5565
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5566
		kfree(ap->slave_link);
5567
		kfree(ap);
5568 5569 5570
		host->ports[i] = NULL;
	}

5571
	dev_set_drvdata(gendev, NULL);
5572 5573
}

5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638
/**
 *	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;
}

5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676
/**
 *	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;
5677
		ap->link.flags |= pi->link_flags;
5678 5679 5680 5681 5682 5683 5684 5685 5686
		ap->ops = pi->port_ops;

		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
			host->ops = pi->port_ops;
	}

	return host;
}

T
Tejun Heo 已提交
5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748
/**
 *	ata_slave_link_init - initialize slave link
 *	@ap: port to initialize slave link for
 *
 *	Create and initialize slave link for @ap.  This enables slave
 *	link handling on the port.
 *
 *	In libata, a port contains links and a link contains devices.
 *	There is single host link but if a PMP is attached to it,
 *	there can be multiple fan-out links.  On SATA, there's usually
 *	a single device connected to a link but PATA and SATA
 *	controllers emulating TF based interface can have two - master
 *	and slave.
 *
 *	However, there are a few controllers which don't fit into this
 *	abstraction too well - SATA controllers which emulate TF
 *	interface with both master and slave devices but also have
 *	separate SCR register sets for each device.  These controllers
 *	need separate links for physical link handling
 *	(e.g. onlineness, link speed) but should be treated like a
 *	traditional M/S controller for everything else (e.g. command
 *	issue, softreset).
 *
 *	slave_link is libata's way of handling this class of
 *	controllers without impacting core layer too much.  For
 *	anything other than physical link handling, the default host
 *	link is used for both master and slave.  For physical link
 *	handling, separate @ap->slave_link is used.  All dirty details
 *	are implemented inside libata core layer.  From LLD's POV, the
 *	only difference is that prereset, hardreset and postreset are
 *	called once more for the slave link, so the reset sequence
 *	looks like the following.
 *
 *	prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
 *	softreset(M) -> postreset(M) -> postreset(S)
 *
 *	Note that softreset is called only for the master.  Softreset
 *	resets both M/S by definition, so SRST on master should handle
 *	both (the standard method will work just fine).
 *
 *	LOCKING:
 *	Should be called before host is registered.
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int ata_slave_link_init(struct ata_port *ap)
{
	struct ata_link *link;

	WARN_ON(ap->slave_link);
	WARN_ON(ap->flags & ATA_FLAG_PMP);

	link = kzalloc(sizeof(*link), GFP_KERNEL);
	if (!link)
		return -ENOMEM;

	ata_link_init(ap, link, 1);
	ap->slave_link = link;
	return 0;
}

5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766
static void ata_host_stop(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

	WARN_ON(!(host->flags & ATA_HOST_STARTED));

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

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
}

5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788
/**
 *	ata_finalize_port_ops - finalize ata_port_operations
 *	@ops: ata_port_operations to finalize
 *
 *	An ata_port_operations can inherit from another ops and that
 *	ops can again inherit from another.  This can go on as many
 *	times as necessary as long as there is no loop in the
 *	inheritance chain.
 *
 *	Ops tables are finalized when the host is started.  NULL or
 *	unspecified entries are inherited from the closet ancestor
 *	which has the method and the entry is populated with it.
 *	After finalization, the ops table directly points to all the
 *	methods and ->inherits is no longer necessary and cleared.
 *
 *	Using ATA_OP_NULL, inheriting ops can force a method to NULL.
 *
 *	LOCKING:
 *	None.
 */
static void ata_finalize_port_ops(struct ata_port_operations *ops)
{
5789
	static DEFINE_SPINLOCK(lock);
5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816
	const struct ata_port_operations *cur;
	void **begin = (void **)ops;
	void **end = (void **)&ops->inherits;
	void **pp;

	if (!ops || !ops->inherits)
		return;

	spin_lock(&lock);

	for (cur = ops->inherits; cur; cur = cur->inherits) {
		void **inherit = (void **)cur;

		for (pp = begin; pp < end; pp++, inherit++)
			if (!*pp)
				*pp = *inherit;
	}

	for (pp = begin; pp < end; pp++)
		if (IS_ERR(*pp))
			*pp = NULL;

	ops->inherits = NULL;

	spin_unlock(&lock);
}

5817 5818 5819 5820 5821 5822 5823
/**
 *	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
5824 5825
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5826 5827 5828 5829 5830 5831 5832 5833 5834
 *
 *	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)
{
5835 5836
	int have_stop = 0;
	void *start_dr = NULL;
5837 5838 5839 5840 5841
	int i, rc;

	if (host->flags & ATA_HOST_STARTED)
		return 0;

5842 5843
	ata_finalize_port_ops(host->ops);

5844 5845 5846
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5847 5848
		ata_finalize_port_ops(ap->ops);

5849 5850 5851
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867
		if (ap->ops->port_stop)
			have_stop = 1;
	}

	if (host->ops->host_stop)
		have_stop = 1;

	if (have_stop) {
		start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
		if (!start_dr)
			return -ENOMEM;
	}

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

5868 5869 5870
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5871
				if (rc != -ENODEV)
A
Andrew Morton 已提交
5872 5873 5874
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
5875 5876 5877 5878 5879 5880
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5881 5882
	if (start_dr)
		devres_add(host->dev, start_dr);
5883 5884 5885 5886 5887 5888 5889 5890 5891 5892
	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);
	}
5893
	devres_free(start_dr);
5894 5895 5896
	return rc;
}

5897
/**
J
Jeff Garzik 已提交
5898 5899 5900 5901 5902
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5903 5904 5905 5906 5907
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5908
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5909
void ata_host_init(struct ata_host *host, struct device *dev,
5910
		   unsigned long flags, struct ata_port_operations *ops)
5911
{
J
Jeff Garzik 已提交
5912 5913 5914 5915
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5916 5917
}

5918 5919 5920 5921 5922

static void async_port_probe(void *data, async_cookie_t cookie)
{
	int rc;
	struct ata_port *ap = data;
5923 5924 5925 5926 5927

	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
5928 5929
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
5930
	 */
5931
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
5932 5933
		async_synchronize_cookie(cookie);

5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969
	/* probe */
	if (ap->ops->error_handler) {
		struct ata_eh_info *ehi = &ap->link.eh_info;
		unsigned long flags;

		ata_port_probe(ap);

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

		ehi->probe_mask |= ATA_ALL_DEVICES;
		ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
		ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

		ap->pflags &= ~ATA_PFLAG_INITIALIZING;
		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.
			 */
		}
	}
5970 5971 5972 5973 5974 5975

	/* in order to keep device order, we need to synchronize at this point */
	async_synchronize_cookie(cookie);

	ata_scsi_scan_host(ap, 1);

5976
}
5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019
/**
 *	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;

6020 6021 6022
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6023 6024 6025 6026 6027 6028 6029 6030 6031 6032
	/* 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 */
6033
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6034 6035
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6036

6037
		/* print per-port info to dmesg */
6038 6039 6040
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6041
		if (!ata_port_is_dummy(ap)) {
6042 6043
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6044
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6045
					ata_mode_string(xfer_mask),
6046
					ap->link.eh_info.desc);
6047 6048
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6049 6050 6051 6052 6053 6054 6055
			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];
6056
		async_schedule(async_port_probe, ap);
6057
	}
6058
	DPRINTK("probe end\n");
6059 6060 6061 6062

	return 0;
}

6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075
/**
 *	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.
 *
6076 6077 6078 6079
 *	An invalid IRQ skips the IRQ registration and expects the host to
 *	have set polling mode on the port. In this case, @irq_handler
 *	should be NULL.
 *
6080 6081 6082 6083 6084 6085 6086 6087 6088 6089
 *	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)
{
6090
	int i, rc;
6091 6092 6093 6094 6095

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

6096 6097 6098 6099 6100 6101
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6102 6103 6104 6105 6106
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6107 6108
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6109

6110 6111 6112 6113 6114 6115 6116 6117
	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;
}

6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128
/**
 *	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).
 */
6129
static void ata_port_detach(struct ata_port *ap)
6130 6131 6132 6133
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6134
		goto skip_eh;
6135 6136

	/* tell EH we're leaving & flush EH */
6137
	spin_lock_irqsave(ap->lock, flags);
6138
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6139
	ata_port_schedule_eh(ap);
6140
	spin_unlock_irqrestore(ap->lock, flags);
6141

T
Tejun Heo 已提交
6142
	/* wait till EH commits suicide */
6143 6144
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6145 6146
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6147

6148
	cancel_rearming_delayed_work(&ap->hotplug_task);
6149

6150
 skip_eh:
6151
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6152
	scsi_remove_host(ap->scsi_host);
6153 6154
}

T
Tejun Heo 已提交
6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169
/**
 *	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]);
6170 6171 6172

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6173 6174
}

6175 6176
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6177 6178 6179 6180
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6181 6182 6183
 *	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
6184 6185 6186 6187
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6188
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6189
{
6190
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6191
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6192

T
Tejun Heo 已提交
6193
	ata_host_detach(host);
L
Linus Torvalds 已提交
6194 6195 6196
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6197
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228
{
	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
6229

6230
#ifdef CONFIG_PM
6231
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6232 6233
{
	pci_save_state(pdev);
6234
	pci_disable_device(pdev);
6235

6236
	if (mesg.event & PM_EVENT_SLEEP)
6237
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6238 6239
}

6240
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6241
{
6242 6243
	int rc;

J
Jens Axboe 已提交
6244 6245
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6246

T
Tejun Heo 已提交
6247
	rc = pcim_enable_device(pdev);
6248 6249 6250 6251 6252 6253
	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
6254
	pci_set_master(pdev);
6255
	return 0;
6256 6257
}

6258
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6259
{
J
Jeff Garzik 已提交
6260
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6261 6262
	int rc = 0;

J
Jeff Garzik 已提交
6263
	rc = ata_host_suspend(host, mesg);
6264 6265 6266
	if (rc)
		return rc;

6267
	ata_pci_device_do_suspend(pdev, mesg);
6268 6269 6270 6271 6272 6273

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6274
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6275
	int rc;
6276

6277 6278 6279 6280
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6281
}
6282 6283
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6284 6285
#endif /* CONFIG_PCI */

6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339
static int __init ata_parse_force_one(char **cur,
				      struct ata_force_ent *force_ent,
				      const char **reason)
{
	/* FIXME: Currently, there's no way to tag init const data and
	 * using __initdata causes build failure on some versions of
	 * gcc.  Once __initdataconst is implemented, add const to the
	 * following structure.
	 */
	static struct ata_force_param force_tbl[] __initdata = {
		{ "40c",	.cbl		= ATA_CBL_PATA40 },
		{ "80c",	.cbl		= ATA_CBL_PATA80 },
		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
		{ "sata",	.cbl		= ATA_CBL_SATA },
		{ "1.5Gbps",	.spd_limit	= 1 },
		{ "3.0Gbps",	.spd_limit	= 2 },
		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
		{ "pio0",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 0) },
		{ "pio1",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 1) },
		{ "pio2",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 2) },
		{ "pio3",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 3) },
		{ "pio4",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 4) },
		{ "pio5",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 5) },
		{ "pio6",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 6) },
		{ "mwdma0",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 0) },
		{ "mwdma1",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 1) },
		{ "mwdma2",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 2) },
		{ "mwdma3",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 3) },
		{ "mwdma4",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 4) },
		{ "udma0",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma/16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma1",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma/25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma2",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma/33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma3",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma/44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma4",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma/66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma5",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma/100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma6",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma/133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma7",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 7) },
6340 6341 6342
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 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 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
	};
	char *start = *cur, *p = *cur;
	char *id, *val, *endp;
	const struct ata_force_param *match_fp = NULL;
	int nr_matches = 0, i;

	/* find where this param ends and update *cur */
	while (*p != '\0' && *p != ',')
		p++;

	if (*p == '\0')
		*cur = p;
	else
		*cur = p + 1;

	*p = '\0';

	/* parse */
	p = strchr(start, ':');
	if (!p) {
		val = strstrip(start);
		goto parse_val;
	}
	*p = '\0';

	id = strstrip(start);
	val = strstrip(p + 1);

	/* parse id */
	p = strchr(id, '.');
	if (p) {
		*p++ = '\0';
		force_ent->device = simple_strtoul(p, &endp, 10);
		if (p == endp || *endp != '\0') {
			*reason = "invalid device";
			return -EINVAL;
		}
	}

	force_ent->port = simple_strtoul(id, &endp, 10);
	if (p == endp || *endp != '\0') {
		*reason = "invalid port/link";
		return -EINVAL;
	}

 parse_val:
	/* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
	for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
		const struct ata_force_param *fp = &force_tbl[i];

		if (strncasecmp(val, fp->name, strlen(val)))
			continue;

		nr_matches++;
		match_fp = fp;

		if (strcasecmp(val, fp->name) == 0) {
			nr_matches = 1;
			break;
		}
	}

	if (!nr_matches) {
		*reason = "unknown value";
		return -EINVAL;
	}
	if (nr_matches > 1) {
		*reason = "ambigious value";
		return -EINVAL;
	}

	force_ent->param = *match_fp;

	return 0;
}

static void __init ata_parse_force_param(void)
{
	int idx = 0, size = 1;
	int last_port = -1, last_device = -1;
	char *p, *cur, *next;

	/* calculate maximum number of params and allocate force_tbl */
	for (p = ata_force_param_buf; *p; p++)
		if (*p == ',')
			size++;

	ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
	if (!ata_force_tbl) {
		printk(KERN_WARNING "ata: failed to extend force table, "
		       "libata.force ignored\n");
		return;
	}

	/* parse and populate the table */
	for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
		const char *reason = "";
		struct ata_force_ent te = { .port = -1, .device = -1 };

		next = cur;
		if (ata_parse_force_one(&next, &te, &reason)) {
			printk(KERN_WARNING "ata: failed to parse force "
			       "parameter \"%s\" (%s)\n",
			       cur, reason);
			continue;
		}

		if (te.port == -1) {
			te.port = last_port;
			te.device = last_device;
		}

		ata_force_tbl[idx++] = te;

		last_port = te.port;
		last_device = te.device;
	}

	ata_force_tbl_size = idx;
}
L
Linus Torvalds 已提交
6463 6464 6465

static int __init ata_init(void)
{
6466 6467
	ata_parse_force_param();

L
Linus Torvalds 已提交
6468 6469
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
6470
		goto free_force_tbl;
L
Linus Torvalds 已提交
6471

6472
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
6473 6474
	if (!ata_aux_wq)
		goto free_wq;
6475

L
Linus Torvalds 已提交
6476 6477
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6478 6479 6480 6481 6482 6483

free_wq:
	destroy_workqueue(ata_wq);
free_force_tbl:
	kfree(ata_force_tbl);
	return -ENOMEM;
L
Linus Torvalds 已提交
6484 6485 6486 6487
}

static void __exit ata_exit(void)
{
6488
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6489
	destroy_workqueue(ata_wq);
6490
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6491 6492
}

6493
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6494 6495
module_exit(ata_exit);

6496
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6497
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516

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;
}

6517 6518 6519 6520 6521
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6522 6523
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540
 *
 *	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,
6541
		      unsigned long interval, unsigned long timeout)
6542
{
6543
	unsigned long deadline;
6544 6545 6546 6547 6548 6549 6550 6551
	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.
	 */
6552
	deadline = ata_deadline(jiffies, timeout);
6553

6554 6555
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
		msleep(interval);
6556 6557 6558 6559 6560 6561
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6562 6563 6564
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6565
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6566
{
T
Tejun Heo 已提交
6567
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6568 6569
}

T
Tejun Heo 已提交
6570
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6571
{
T
Tejun Heo 已提交
6572
	/* truly dummy */
T
Tejun Heo 已提交
6573 6574
}

6575
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6576 6577
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6578
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6579 6580
};

6581 6582 6583 6584
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6585 6586 6587 6588 6589 6590
/*
 * 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.
 */
6591 6592 6593
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6594 6595
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6596
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6597
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6598 6599
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6600
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6601
EXPORT_SYMBOL_GPL(ata_host_init);
6602
EXPORT_SYMBOL_GPL(ata_host_alloc);
6603
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6604
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6605
EXPORT_SYMBOL_GPL(ata_host_start);
6606
EXPORT_SYMBOL_GPL(ata_host_register);
6607
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6608
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6609
EXPORT_SYMBOL_GPL(ata_sg_init);
6610
EXPORT_SYMBOL_GPL(ata_qc_complete);
6611
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6612
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6613 6614
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6615 6616 6617 6618 6619 6620 6621
EXPORT_SYMBOL_GPL(ata_pack_xfermask);
EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
EXPORT_SYMBOL_GPL(ata_mode_string);
EXPORT_SYMBOL_GPL(ata_id_xfermask);
L
Linus Torvalds 已提交
6622
EXPORT_SYMBOL_GPL(ata_port_start);
6623
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6624
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6625
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6626
EXPORT_SYMBOL_GPL(ata_port_probe);
6627
EXPORT_SYMBOL_GPL(ata_dev_disable);
6628
EXPORT_SYMBOL_GPL(sata_set_spd);
6629
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6630 6631
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6632
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6633
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6634
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6635
EXPORT_SYMBOL_GPL(ata_std_postreset);
6636 6637
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6638
EXPORT_SYMBOL_GPL(ata_port_disable);
6639
EXPORT_SYMBOL_GPL(ata_ratelimit);
6640
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6641 6642
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6643
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6644
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6645 6646 6647 6648
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);
6649 6650
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6651
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6652 6653
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6654
#endif /* CONFIG_PM */
6655 6656
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6657
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6658 6659
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6660
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6661
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6662 6663
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6664
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6665

L
Linus Torvalds 已提交
6666 6667 6668
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6669
#ifdef CONFIG_PM
6670 6671
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6672 6673
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6674
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6675
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6676

T
Tejun Heo 已提交
6677 6678 6679
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6680 6681 6682 6683
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6684
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6685
EXPORT_SYMBOL_GPL(ata_link_abort);
6686
EXPORT_SYMBOL_GPL(ata_port_abort);
6687
EXPORT_SYMBOL_GPL(ata_port_freeze);
6688
EXPORT_SYMBOL_GPL(sata_async_notification);
6689 6690
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6691 6692
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6693
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6694
EXPORT_SYMBOL_GPL(ata_do_eh);
6695
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6696 6697 6698 6699

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6700
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6701
EXPORT_SYMBOL_GPL(ata_cable_sata);