libata-core.c 171.3 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 <linux/log2.h>
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#include <linux/slab.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 <linux/ratelimit.h>
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#include "libata.h"
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#include "libata-transport.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);
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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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);
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MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
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static int atapi_dmadir = 0;
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module_param(atapi_dmadir, int, 0444);
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MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
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int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
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MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
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int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
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MODULE_PARM_DESC(fua, "FUA support (0=off [default], 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, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
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MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
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static int atapi_an;
module_param(atapi_an, int, 0444);
MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)");

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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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static bool ata_sstatus_online(u32 sstatus)
{
	return (sstatus & 0xf) == 0x3;
}

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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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/**
636
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
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 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
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 *	Examine the device configuration and tf->flags to calculate
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 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
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static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
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{
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	u8 cmd;
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	int index, fua, lba48, write;
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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
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	}
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	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
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}

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

	if (tf->flags & ATA_TFLAG_LBA) {
		if (tf->flags & ATA_TFLAG_LBA48) {
			block |= (u64)tf->hob_lbah << 40;
			block |= (u64)tf->hob_lbam << 32;
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			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;

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		if (!sect) {
			ata_dev_printk(dev, KERN_WARNING, "device reported "
				       "invalid CHS sector 0\n");
			sect = 1; /* oh well */
		}

		block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
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	}

	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;

752
	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.
 */
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unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
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{
	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.
 */
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void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
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{
	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;
}

893
static const struct ata_xfer_ent {
894
	int shift, bits;
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	u8 base;
} ata_xfer_tbl[] = {
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	{ 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:
914
 *	Matching XFER_* value, 0xff if no match found.
915
 */
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u8 ata_xfer_mask2mode(unsigned long xfer_mask)
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{
	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;
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	return 0xff;
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}

/**
 *	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.
 */
939
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
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{
	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)
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			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
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	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.
 */
962
int ata_xfer_mode2shift(unsigned long xfer_mode)
963 964 965 966 967 968 969 970 971
{
	const struct ata_xfer_ent *ent;

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

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/**
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 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
977
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
984
 *	@mode_mask, or the constant C string "<n/a>".
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 */
986
const char *ata_mode_string(unsigned long xfer_mask)
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{
988 989 990 991 992 993
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
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		"PIO5",
		"PIO6",
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		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
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		"MWDMA3",
		"MWDMA4",
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		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
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	int highbit;
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	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
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	return "<n/a>";
}

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const char *sata_spd_string(unsigned int spd)
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{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
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		"6.0 Gbps",
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	};

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

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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:
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 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
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{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
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	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
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	 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
	 * SEMB signature.  This is worked around in
	 * ata_dev_read_id().
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	 */
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	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

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

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	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)) {
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		DPRINTK("found SEMB device by sig (could be ATA device)\n");
		return ATA_DEV_SEMB;
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	}

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

/**
1094
 *	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.
 */

1108 1109
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

1113 1114
	BUG_ON(len & 1);

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

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

		ofs++;
		len -= 2;
	}
}

1129
/**
1130
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1131 1132 1133 1134 1135
 *	@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.
 *
1136
 *	This function is identical to ata_id_string except that it
1137 1138 1139 1140 1141 1142
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1143 1144
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1145 1146 1147
{
	unsigned char *p;

1148
	ata_id_string(id, s, ofs, len - 1);
1149 1150 1151 1152 1153 1154

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
Edward Falk 已提交
1155

T
Tejun Heo 已提交
1156 1157 1158 1159
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1160
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
T
Tejun Heo 已提交
1161
		else
1162
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
T
Tejun Heo 已提交
1163 1164
	} else {
		if (ata_id_current_chs_valid(id))
1165 1166
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
T
Tejun Heo 已提交
1167
		else
1168 1169
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
T
Tejun Heo 已提交
1170 1171 1172
	}
}

1173
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1174 1175 1176 1177 1178
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1179
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
A
Alan Cox 已提交
1180 1181 1182 1183
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1184
	return sectors;
A
Alan Cox 已提交
1185 1186
}

1187
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1188 1189 1190 1191 1192 1193 1194 1195
{
	u64 sectors = 0;

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

1196
	return sectors;
A
Alan Cox 已提交
1197 1198 1199
}

/**
1200 1201 1202
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
Alan Cox 已提交
1203
 *
1204 1205
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
Alan Cox 已提交
1206
 *
1207 1208 1209
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
Alan Cox 已提交
1210
 */
1211
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1212
{
1213
	unsigned int err_mask;
A
Alan Cox 已提交
1214
	struct ata_taskfile tf;
1215
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1216 1217 1218

	ata_tf_init(dev, &tf);

1219
	/* always clear all address registers */
A
Alan Cox 已提交
1220 1221
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1222 1223 1224 1225 1226
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
Alan Cox 已提交
1227 1228

	tf.protocol |= ATA_PROT_NODATA;
1229 1230
	tf.device |= ATA_LBA;

1231
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1232 1233 1234 1235 1236 1237 1238
	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;
	}
A
Alan Cox 已提交
1239

1240
	if (lba48)
1241
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1242
	else
1243
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1244
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1245
		(*max_sectors)--;
1246
	return 0;
A
Alan Cox 已提交
1247 1248 1249
}

/**
1250 1251
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1252
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
1253
 *
1254 1255 1256 1257 1258 1259
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
Alan Cox 已提交
1260
 */
T
Tejun Heo 已提交
1261
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1262
{
1263
	unsigned int err_mask;
A
Alan Cox 已提交
1264
	struct ata_taskfile tf;
1265
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1266 1267 1268 1269 1270 1271

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1272 1273 1274 1275 1276 1277 1278 1279

	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;
T
Tejun Heo 已提交
1280
	} else {
1281 1282
		tf.command = ATA_CMD_SET_MAX;

T
Tejun Heo 已提交
1283 1284 1285
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1286
	tf.protocol |= ATA_PROT_NODATA;
1287
	tf.device |= ATA_LBA;
A
Alan Cox 已提交
1288 1289 1290 1291 1292

	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;

1293
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
	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;
A
Alan Cox 已提交
1304 1305 1306 1307 1308 1309 1310 1311 1312
}

/**
 *	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.
T
Tejun Heo 已提交
1313 1314 1315
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
Alan Cox 已提交
1316
 */
T
Tejun Heo 已提交
1317
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1318
{
T
Tejun Heo 已提交
1319 1320
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
T
Tejun Heo 已提交
1321
	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
T
Tejun Heo 已提交
1322 1323
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1324
	int rc;
J
Jeff Garzik 已提交
1325

T
Tejun Heo 已提交
1326 1327 1328 1329
	/* 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))
1330
		return 0;
A
Alan Cox 已提交
1331

T
Tejun Heo 已提交
1332 1333 1334
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
Tejun Heo 已提交
1335 1336
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1337
		 */
T
Tejun Heo 已提交
1338
		if (rc == -EACCES || !unlock_hpa) {
T
Tejun Heo 已提交
1339
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1340
				       "broken, skipping HPA handling\n");
T
Tejun Heo 已提交
1341 1342 1343 1344 1345
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
Alan Cox 已提交
1346
		}
T
Tejun Heo 已提交
1347

T
Tejun Heo 已提交
1348 1349
		return rc;
	}
T
Tejun Heo 已提交
1350
	dev->n_native_sectors = native_sectors;
T
Tejun Heo 已提交
1351 1352

	/* nothing to do? */
T
Tejun Heo 已提交
1353
	if (native_sectors <= sectors || !unlock_hpa) {
T
Tejun Heo 已提交
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
		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;
A
Alan Cox 已提交
1402 1403
}

L
Linus Torvalds 已提交
1404 1405
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1406
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1407
 *
1408 1409
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1410 1411 1412 1413 1414
 *
 *	LOCKING:
 *	caller.
 */

1415
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1416 1417 1418 1419 1420 1421
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1422 1423 1424 1425 1426
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1427 1428 1429 1430 1431
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1432 1433 1434 1435 1436
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1437 1438
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1439 1440
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1441 1442
}

1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
/**
 *	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
 */
1458
unsigned long ata_id_xfermask(const u16 *id)
1459
{
1460
	unsigned long pio_mask, mwdma_mask, udma_mask;
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471

	/* 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.
		 */
1472
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1473
		if (mode < 5)	/* Valid PIO range */
1474
			pio_mask = (2 << mode) - 1;
1475 1476
		else
			pio_mask = 1;
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486

		/* 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;
1487

1488 1489 1490 1491
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
S
Sergei Shtylyov 已提交
1492 1493
		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504

		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);
	}

1505 1506 1507
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1508 1509 1510 1511

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

1512
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1513
{
1514
	struct completion *waiting = qc->private_data;
1515 1516 1517 1518 1519

	complete(waiting);
}

/**
1520
 *	ata_exec_internal_sg - execute libata internal command
1521 1522
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1523
 *	@cdb: CDB for packet command
1524
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1525
 *	@sgl: sg list for the data buffer of the command
1526
 *	@n_elem: Number of sg entries
1527
 *	@timeout: Timeout in msecs (0 for default)
1528 1529 1530 1531 1532 1533 1534 1535 1536
 *
 *	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.
1537 1538 1539
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1540
 */
1541 1542
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1543
			      int dma_dir, struct scatterlist *sgl,
1544
			      unsigned int n_elem, unsigned long timeout)
1545
{
T
Tejun Heo 已提交
1546 1547
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1548
	u8 command = tf->command;
1549
	int auto_timeout = 0;
1550
	struct ata_queued_cmd *qc;
1551
	unsigned int tag, preempted_tag;
1552
	u32 preempted_sactive, preempted_qc_active;
1553
	int preempted_nr_active_links;
1554
	DECLARE_COMPLETION_ONSTACK(wait);
1555
	unsigned long flags;
1556
	unsigned int err_mask;
1557
	int rc;
1558

1559
	spin_lock_irqsave(ap->lock, flags);
1560

1561
	/* no internal command while frozen */
1562
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1563
		spin_unlock_irqrestore(ap->lock, flags);
1564 1565 1566
		return AC_ERR_SYSTEM;
	}

1567
	/* initialize internal qc */
1568

1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
	/* 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;

1579 1580
	if (test_and_set_bit(tag, &ap->qc_allocated))
		BUG();
1581
	qc = __ata_qc_from_tag(ap, tag);
1582 1583 1584 1585 1586 1587 1588

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

T
Tejun Heo 已提交
1589 1590
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1591
	preempted_qc_active = ap->qc_active;
1592
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1593 1594
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1595
	ap->qc_active = 0;
1596
	ap->nr_active_links = 0;
1597 1598

	/* prepare & issue qc */
1599
	qc->tf = *tf;
1600 1601
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1602
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1603 1604
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1605
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1606
		struct scatterlist *sg;
1607

J
Jens Axboe 已提交
1608 1609
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1610

J
Jens Axboe 已提交
1611
		ata_sg_init(qc, sgl, n_elem);
1612
		qc->nbytes = buflen;
1613 1614
	}

1615
	qc->private_data = &wait;
1616 1617
	qc->complete_fn = ata_qc_complete_internal;

1618
	ata_qc_issue(qc);
1619

1620
	spin_unlock_irqrestore(ap->lock, flags);
1621

1622 1623 1624 1625 1626 1627 1628 1629
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1630

1631 1632 1633
	if (ap->ops->error_handler)
		ata_eh_release(ap);

1634
	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1635

1636 1637 1638
	if (ap->ops->error_handler)
		ata_eh_acquire(ap);

1639
	ata_sff_flush_pio_task(ap);
1640

1641
	if (!rc) {
1642
		spin_lock_irqsave(ap->lock, flags);
1643 1644 1645

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1646 1647
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1648
		 */
1649
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1650 1651 1652 1653 1654 1655
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1656

1657 1658
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1659
					"qc timeout (cmd 0x%x)\n", command);
1660 1661
		}

1662
		spin_unlock_irqrestore(ap->lock, flags);
1663 1664
	}

1665 1666 1667 1668
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
	/* 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;
1679 1680
	}

1681
	/* finish up */
1682
	spin_lock_irqsave(ap->lock, flags);
1683

1684
	*tf = qc->result_tf;
1685 1686 1687
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1688 1689
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1690
	ap->qc_active = preempted_qc_active;
1691
	ap->nr_active_links = preempted_nr_active_links;
1692

1693
	spin_unlock_irqrestore(ap->lock, flags);
1694

1695 1696 1697
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1698
	return err_mask;
1699 1700
}

1701
/**
1702
 *	ata_exec_internal - execute libata internal command
1703 1704 1705 1706 1707 1708
 *	@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
1709
 *	@timeout: Timeout in msecs (0 for default)
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
 *
 *	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,
1722 1723
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1724
{
1725 1726
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1727

1728 1729 1730 1731 1732 1733
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1734

1735 1736
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1737 1738
}

1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
/**
 *	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
1752
 */
1753
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1754 1755 1756 1757 1758 1759 1760 1761 1762
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1763
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1764 1765
}

1766 1767 1768 1769 1770 1771 1772 1773 1774
/**
 *	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.
 */
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
T
Tejun Heo 已提交
1775 1776 1777 1778 1779 1780 1781 1782 1783
	/* Don't set IORDY if we're preparing for reset.  IORDY may
	 * lead to controller lock up on certain controllers if the
	 * port is not occupied.  See bko#11703 for details.
	 */
	if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
		return 0;
	/* Controller doesn't support IORDY.  Probably a pointless
	 * check as the caller should know this.
	 */
T
Tejun Heo 已提交
1784
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1785
		return 0;
1786 1787 1788 1789
	/* 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
1790 1791 1792 1793 1794
	/* 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))
1795
		return 1;
A
Alan Cox 已提交
1796 1797
	return 0;
}
1798

A
Alan Cox 已提交
1799 1800 1801 1802 1803 1804 1805 1806 1807
/**
 *	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.
 */
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1808 1809
	/* 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
1810
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1811 1812 1813 1814
		/* 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
1815 1816
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1817 1818
		}
	}
A
Alan Cox 已提交
1819
	return 3 << ATA_SHIFT_PIO;
1820 1821
}

1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
/**
 *	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
1839
/**
1840 1841 1842
 *	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)
1843
 *	@flags: ATA_READID_* flags
1844
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1845
 *
1846 1847
 *	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
1848 1849
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1850
 *
1851
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1852
 *	now we abort if we hit that case.
1853
 *
L
Linus Torvalds 已提交
1854
 *	LOCKING:
1855 1856 1857 1858
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1859
 */
1860
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1861
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1862
{
T
Tejun Heo 已提交
1863
	struct ata_port *ap = dev->link->ap;
1864
	unsigned int class = *p_class;
1865
	struct ata_taskfile tf;
1866 1867
	unsigned int err_mask = 0;
	const char *reason;
T
Tejun Heo 已提交
1868
	bool is_semb = class == ATA_DEV_SEMB;
1869
	int may_fallback = 1, tried_spinup = 0;
1870
	int rc;
L
Linus Torvalds 已提交
1871

1872
	if (ata_msg_ctl(ap))
1873
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
1874

1875
retry:
T
Tejun Heo 已提交
1876
	ata_tf_init(dev, &tf);
1877

1878
	switch (class) {
T
Tejun Heo 已提交
1879 1880
	case ATA_DEV_SEMB:
		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
1881
	case ATA_DEV_ATA:
1882
		tf.command = ATA_CMD_ID_ATA;
1883 1884
		break;
	case ATA_DEV_ATAPI:
1885
		tf.command = ATA_CMD_ID_ATAPI;
1886 1887 1888 1889 1890
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1891 1892
	}

1893
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903

	/* 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
1904

1905 1906 1907 1908 1909
	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);

1910
	if (err_mask) {
1911
		if (err_mask & AC_ERR_NODEV_HINT) {
1912 1913
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
1914 1915 1916
			return -ENOENT;
		}

T
Tejun Heo 已提交
1917 1918 1919 1920 1921 1922 1923 1924
		if (is_semb) {
			ata_dev_printk(dev, KERN_INFO, "IDENTIFY failed on "
				       "device w/ SEMB sig, disabled\n");
			/* SEMB is not supported yet */
			*p_class = ATA_DEV_SEMB_UNSUP;
			return 0;
		}

1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
		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;
1948 1949
		}

1950 1951
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1952 1953 1954
		goto err_out;
	}

1955 1956 1957 1958 1959 1960 1961 1962
	if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
		ata_dev_printk(dev, KERN_DEBUG, "dumping IDENTIFY data, "
			       "class=%d may_fallback=%d tried_spinup=%d\n",
			       class, may_fallback, tried_spinup);
		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
			       16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
	}

1963 1964 1965 1966 1967
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1968
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1969

1970
	/* sanity check */
1971
	rc = -EINVAL;
A
Alan Cox 已提交
1972
	reason = "device reports invalid type";
1973 1974 1975 1976 1977 1978 1979

	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;
1980 1981
	}

1982 1983 1984 1985 1986 1987 1988
	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.
		 */
1989
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1990
		if (err_mask && id[2] != 0x738c) {
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
			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;
	}

2003
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2004 2005 2006
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2007 2008
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2009 2010
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2011 2012
		 *
		 * Note that ATA4 says lba is mandatory so the second check
2013
		 * should never trigger.
2014 2015
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2016
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2017 2018 2019 2020 2021 2022 2023 2024 2025
			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.
			 */
2026
			flags &= ~ATA_READID_POSTRESET;
2027 2028 2029 2030 2031
			goto retry;
		}
	}

	*p_class = class;
2032

2033 2034 2035
	return 0;

 err_out:
T
Tejun Heo 已提交
2036
	if (ata_msg_warn(ap))
2037
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2038
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2039 2040 2041
	return rc;
}

2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
static int ata_do_link_spd_horkage(struct ata_device *dev)
{
	struct ata_link *plink = ata_dev_phys_link(dev);
	u32 target, target_limit;

	if (!sata_scr_valid(plink))
		return 0;

	if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
		target = 1;
	else
		return 0;

	target_limit = (1 << target) - 1;

	/* if already on stricter limit, no need to push further */
	if (plink->sata_spd_limit <= target_limit)
		return 0;

	plink->sata_spd_limit = target_limit;

	/* Request another EH round by returning -EAGAIN if link is
	 * going faster than the target speed.  Forward progress is
	 * guaranteed by setting sata_spd_limit to target_limit above.
	 */
	if (plink->sata_spd > target) {
		ata_dev_printk(dev, KERN_INFO,
			       "applying link speed limit horkage to %s\n",
			       sata_spd_string(target));
		return -EAGAIN;
	}
	return 0;
}

T
Tejun Heo 已提交
2076
static inline u8 ata_dev_knobble(struct ata_device *dev)
2077
{
T
Tejun Heo 已提交
2078
	struct ata_port *ap = dev->link->ap;
2079 2080 2081 2082

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

T
Tejun Heo 已提交
2083
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2084 2085
}

2086
static int ata_dev_config_ncq(struct ata_device *dev,
2087 2088
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2089
	struct ata_port *ap = dev->link->ap;
2090
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2091 2092
	unsigned int err_mask;
	char *aa_desc = "";
2093 2094 2095

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2096
		return 0;
2097
	}
T
Tejun Heo 已提交
2098
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2099
		snprintf(desc, desc_sz, "NCQ (not used)");
2100
		return 0;
2101
	}
2102
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2103
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2104 2105 2106
		dev->flags |= ATA_DFLAG_NCQ;
	}

2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122
	if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
		(ap->flags & ATA_FLAG_FPDMA_AA) &&
		ata_id_has_fpdma_aa(dev->id)) {
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
			SATA_FPDMA_AA);
		if (err_mask) {
			ata_dev_printk(dev, KERN_ERR, "failed to enable AA"
				"(error_mask=0x%x)\n", err_mask);
			if (err_mask != AC_ERR_DEV) {
				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
				return -EIO;
			}
		} else
			aa_desc = ", AA";
	}

2123
	if (hdepth >= ddepth)
2124
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2125
	else
2126 2127 2128
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
	return 0;
2129 2130
}

2131
/**
2132 2133 2134 2135 2136
 *	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.
2137 2138
 *
 *	LOCKING:
2139 2140 2141 2142
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2143
 */
2144
int ata_dev_configure(struct ata_device *dev)
2145
{
T
Tejun Heo 已提交
2146 2147
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2148
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2149
	const u16 *id = dev->id;
2150
	unsigned long xfer_mask;
2151
	char revbuf[7];		/* XYZ-99\0 */
2152 2153
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2154
	int rc;
2155

2156
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2157
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2158
			       __func__);
2159
		return 0;
2160 2161
	}

2162
	if (ata_msg_probe(ap))
2163
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2164

T
Tejun Heo 已提交
2165 2166
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2167
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2168

2169 2170 2171 2172 2173 2174 2175
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2176 2177 2178 2179 2180 2181 2182 2183 2184 2185
	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;
	}

2186 2187 2188 2189
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2190 2191 2192 2193
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2194

T
Tejun Heo 已提交
2195 2196 2197 2198 2199
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2200
	/* print device capabilities */
2201
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2202 2203 2204
		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",
2205
			       __func__,
2206 2207
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2208

2209
	/* initialize to-be-configured parameters */
2210
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2211 2212 2213 2214 2215 2216
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2217
	dev->multi_count = 0;
2218

L
Linus Torvalds 已提交
2219 2220 2221 2222
	/*
	 * common ATA, ATAPI feature tests
	 */

2223
	/* find max transfer mode; for printk only */
2224
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2225

2226 2227
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2228

2229 2230 2231 2232 2233 2234 2235
	/* 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
2236 2237
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2238
		if (ata_id_is_cfa(id)) {
S
Sergei Shtylyov 已提交
2239 2240
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
T
Tejun Heo 已提交
2241 2242
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
2243
					       "not be fully accessible.\n");
2244
			snprintf(revbuf, 7, "CFA");
2245
		} else {
2246
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2247 2248 2249 2250
			/* 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 "
2251
					       "not be fully accessible.\n");
2252
		}
2253

2254
		dev->n_sectors = ata_id_n_sectors(id);
2255

2256 2257 2258 2259 2260 2261 2262 2263 2264
		/* get current R/W Multiple count setting */
		if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
			unsigned int max = dev->id[47] & 0xff;
			unsigned int cnt = dev->id[59] & 0xff;
			/* only recognize/allow powers of two here */
			if (is_power_of_2(max) && is_power_of_2(cnt))
				if (cnt <= max)
					dev->multi_count = cnt;
		}
2265

2266
		if (ata_id_has_lba(id)) {
2267
			const char *lba_desc;
2268
			char ncq_desc[24];
2269

2270 2271
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2272
			if (ata_id_has_lba48(id)) {
2273
				dev->flags |= ATA_DFLAG_LBA48;
2274
				lba_desc = "LBA48";
2275 2276 2277 2278

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2279
			}
2280

2281
			/* config NCQ */
2282 2283 2284
			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
			if (rc)
				return rc;
2285

2286
			/* print device info to dmesg */
2287 2288 2289 2290 2291 2292 2293
			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",
2294
					(unsigned long long)dev->n_sectors,
2295 2296
					dev->multi_count, lba_desc, ncq_desc);
			}
2297
		} else {
2298 2299 2300
			/* CHS */

			/* Default translation */
2301 2302 2303
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2304

2305
			if (ata_id_current_chs_valid(id)) {
2306
				/* Current CHS translation is valid. */
2307 2308 2309
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2310 2311 2312
			}

			/* print device info to dmesg */
2313
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2314
				ata_dev_printk(dev, KERN_INFO,
2315 2316 2317
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2318
				ata_dev_printk(dev, KERN_INFO,
2319 2320 2321 2322 2323
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2324 2325
		}

2326
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2327 2328 2329
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2330
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2331 2332
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2333
		const char *dma_dir_string = "";
2334
		u32 sntf;
2335

2336
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2337
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2338
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2339 2340
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2341
			rc = -EINVAL;
L
Linus Torvalds 已提交
2342 2343
			goto err_out_nosup;
		}
2344
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2345

2346 2347 2348 2349
		/* 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.
2350
		 */
T
Tejun Heo 已提交
2351 2352
		if (atapi_an &&
		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2353
		    (!sata_pmp_attached(ap) ||
2354
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2355 2356
			unsigned int err_mask;

2357
			/* issue SET feature command to turn this on */
2358 2359
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2360
			if (err_mask)
2361
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2362 2363 2364
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2365
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2366 2367
				atapi_an_string = ", ATAPI AN";
			}
2368 2369
		}

2370
		if (ata_id_cdb_intr(dev->id)) {
2371
			dev->flags |= ATA_DFLAG_CDB_INTR;
2372 2373
			cdb_intr_string = ", CDB intr";
		}
2374

2375 2376 2377 2378 2379
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2380
		/* print device info to dmesg */
2381
		if (ata_msg_drv(ap) && print_info)
2382
			ata_dev_printk(dev, KERN_INFO,
2383
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2384
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2385
				       ata_mode_string(xfer_mask),
2386 2387
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2388 2389
	}

2390 2391 2392 2393 2394
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2395 2396
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2397
	if (ata_dev_knobble(dev)) {
2398
		if (ata_msg_drv(ap) && print_info)
2399 2400
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2401
		dev->udma_mask &= ATA_UDMA5;
2402 2403 2404
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2405
	if ((dev->class == ATA_DEV_ATAPI) &&
2406
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2407
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2408 2409
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2410

T
Tejun Heo 已提交
2411
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2412 2413
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2414

2415
	if (ap->ops->dev_config)
2416
		ap->ops->dev_config(dev);
2417

2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
	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");
		}
	}

2433 2434 2435 2436 2437 2438 2439
	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");
	}

2440
	return 0;
L
Linus Torvalds 已提交
2441 2442

err_out_nosup:
2443
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2444
		ata_dev_printk(dev, KERN_DEBUG,
2445
			       "%s: EXIT, err\n", __func__);
2446
	return rc;
L
Linus Torvalds 已提交
2447 2448
}

A
Alan Cox 已提交
2449
/**
2450
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2451 2452
 *	@ap: port
 *
2453
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2454 2455 2456 2457 2458 2459 2460 2461 2462
 *	detection.
 */

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

/**
2463
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2464 2465
 *	@ap: port
 *
2466
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486
 *	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
2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
/**
 *	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
2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510
/**
 *	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
2511 2512 2513 2514
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2515 2516 2517 2518
 *	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
2519
 *	LOCKING:
J
Jeff Garzik 已提交
2520
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2521 2522
 *
 *	RETURNS:
2523
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2524 2525
 */

2526
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2527
{
2528
	unsigned int classes[ATA_MAX_DEVICES];
2529
	int tries[ATA_MAX_DEVICES];
2530
	int rc;
2531
	struct ata_device *dev;
L
Linus Torvalds 已提交
2532

T
Tejun Heo 已提交
2533
	ata_for_each_dev(dev, &ap->link, ALL)
2534
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2535 2536

 retry:
T
Tejun Heo 已提交
2537
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555
		/* 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);
	}

2556
	/* reset and determine device classes */
2557
	ap->ops->phy_reset(ap);
2558

T
Tejun Heo 已提交
2559
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2560
		if (dev->class != ATA_DEV_UNKNOWN)
2561 2562 2563
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2564

2565
		dev->class = ATA_DEV_UNKNOWN;
2566
	}
L
Linus Torvalds 已提交
2567

2568 2569 2570 2571
	/* 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
2572
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2573 2574
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2575

2576
		if (!ata_dev_enabled(dev))
2577 2578
			continue;

2579 2580
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2581 2582
		if (rc)
			goto fail;
2583 2584
	}

A
Alan Cox 已提交
2585 2586 2587 2588
	/* 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
2589 2590 2591 2592 2593 2594
	/* 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
2595 2596 2597
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2598 2599 2600
	/* 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
2601
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2602
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2603
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2604
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2605 2606
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2607 2608
	}

2609
	/* configure transfer mode */
2610
	rc = ata_set_mode(&ap->link, &dev);
2611
	if (rc)
2612
		goto fail;
L
Linus Torvalds 已提交
2613

T
Tejun Heo 已提交
2614 2615
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2616

2617
	return -ENODEV;
2618 2619

 fail:
2620 2621
	tries[dev->devno]--;

2622 2623
	switch (rc) {
	case -EINVAL:
2624
		/* eeek, something went very wrong, give up */
2625 2626
		tries[dev->devno] = 0;
		break;
2627 2628 2629 2630

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2631
	case -EIO:
2632 2633 2634 2635
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2636
			sata_down_spd_limit(&ap->link, 0);
2637 2638
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2639 2640
	}

2641
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2642
		ata_dev_disable(dev);
2643

2644
	goto retry;
L
Linus Torvalds 已提交
2645 2646
}

2647 2648
/**
 *	sata_print_link_status - Print SATA link status
2649
 *	@link: SATA link to printk link status about
2650 2651 2652 2653 2654 2655
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2656
static void sata_print_link_status(struct ata_link *link)
2657
{
2658
	u32 sstatus, scontrol, tmp;
2659

2660
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2661
		return;
2662
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2663

T
Tejun Heo 已提交
2664
	if (ata_phys_link_online(link)) {
2665
		tmp = (sstatus >> 4) & 0xf;
2666
		ata_link_printk(link, KERN_INFO,
2667 2668
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2669
	} else {
2670
		ata_link_printk(link, KERN_INFO,
2671 2672
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2673 2674 2675
	}
}

2676 2677 2678 2679 2680 2681 2682
/**
 *	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
 */
2683

T
Tejun Heo 已提交
2684
struct ata_device *ata_dev_pair(struct ata_device *adev)
2685
{
T
Tejun Heo 已提交
2686 2687
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2688
	if (!ata_dev_enabled(pair))
2689 2690 2691 2692
		return NULL;
	return pair;
}

2693
/**
2694
 *	sata_down_spd_limit - adjust SATA spd limit downward
2695
 *	@link: Link to adjust SATA spd limit for
2696
 *	@spd_limit: Additional limit
2697
 *
2698
 *	Adjust SATA spd limit of @link downward.  Note that this
2699
 *	function only adjusts the limit.  The change must be applied
2700
 *	using sata_set_spd().
2701
 *
2702 2703 2704 2705 2706
 *	If @spd_limit is non-zero, the speed is limited to equal to or
 *	lower than @spd_limit if such speed is supported.  If
 *	@spd_limit is slower than any supported speed, only the lowest
 *	supported speed is allowed.
 *
2707 2708 2709 2710 2711 2712
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2713
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2714
{
2715
	u32 sstatus, spd, mask;
2716
	int rc, bit;
2717

2718
	if (!sata_scr_valid(link))
2719 2720 2721
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2722
	 * If not, use cached value in link->sata_spd.
2723
	 */
2724
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2725
	if (rc == 0 && ata_sstatus_online(sstatus))
2726 2727
		spd = (sstatus >> 4) & 0xf;
	else
2728
		spd = link->sata_spd;
2729

2730
	mask = link->sata_spd_limit;
2731 2732
	if (mask <= 1)
		return -EINVAL;
2733 2734

	/* unconditionally mask off the highest bit */
2735 2736
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2737

2738 2739 2740 2741 2742 2743 2744 2745 2746
	/* 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? */
2747 2748 2749
	if (!mask)
		return -EINVAL;

2750 2751 2752 2753 2754 2755 2756 2757 2758
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

2759
	link->sata_spd_limit = mask;
2760

2761
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2762
			sata_spd_string(fls(mask)));
2763 2764 2765 2766

	return 0;
}

2767
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2768
{
2769 2770
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2771

2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782
	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;
2783
	else
2784
		target = fls(limit);
2785 2786

	spd = (*scontrol >> 4) & 0xf;
2787
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2788

2789
	return spd != target;
2790 2791 2792
}

/**
2793
 *	sata_set_spd_needed - is SATA spd configuration needed
2794
 *	@link: Link in question
2795 2796
 *
 *	Test whether the spd limit in SControl matches
2797
 *	@link->sata_spd_limit.  This function is used to determine
2798 2799 2800 2801 2802 2803 2804 2805 2806
 *	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
2807
static int sata_set_spd_needed(struct ata_link *link)
2808 2809 2810
{
	u32 scontrol;

2811
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2812
		return 1;
2813

2814
	return __sata_set_spd_needed(link, &scontrol);
2815 2816 2817
}

/**
2818
 *	sata_set_spd - set SATA spd according to spd limit
2819
 *	@link: Link to set SATA spd for
2820
 *
2821
 *	Set SATA spd of @link according to sata_spd_limit.
2822 2823 2824 2825 2826 2827
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2828
 *	changed.  Negative errno if SCR registers are inaccessible.
2829
 */
2830
int sata_set_spd(struct ata_link *link)
2831 2832
{
	u32 scontrol;
2833
	int rc;
2834

2835
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2836
		return rc;
2837

2838
	if (!__sata_set_spd_needed(link, &scontrol))
2839 2840
		return 0;

2841
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2842 2843
		return rc;

2844 2845 2846
	return 1;
}

A
Alan Cox 已提交
2847 2848 2849 2850 2851
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2852
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2853
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2854 2855 2856
 * 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
2857 2858 2859
 */

static const struct ata_timing ata_timing[] = {
2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886
/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0,  960,   0 }, */
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 0,  600,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 0,  383,   0 },
	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 0,  240,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 0,  180,   0 },
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 0,  120,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 0,  100,   0 },
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20, 0,   80,   0 },

	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 50, 960,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 30, 480,   0 },
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 20, 240,   0 },

	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 20, 480,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 5,  150,   0 },
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 5,  120,   0 },
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 5,  100,   0 },
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20, 5,   80,   0 },

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0, 0,    0, 150 }, */
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0, 0,    0, 120 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0, 0,    0,  80 },
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0, 0,    0,  60 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0, 0,    0,  45 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0, 0,    0,  30 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0, 0,    0,  20 },
	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0, 0,    0,  15 },
A
Alan Cox 已提交
2887 2888 2889 2890

	{ 0xFF }
};

2891 2892
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2893 2894 2895

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
2896 2897 2898 2899 2900 2901 2902 2903 2904
	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->dmack_hold	= EZ(t->dmack_hold * 1000,  T);
	q->cycle	= EZ(t->cycle      * 1000,  T);
	q->udma		= EZ(t->udma       * 1000, UT);
A
Alan Cox 已提交
2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
}

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);
2916
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
2917 2918 2919 2920
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2921
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2922
{
2923 2924 2925 2926
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2927

2928 2929 2930
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
2931 2932 2933 2934 2935
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
2936
	const u16 *id = adev->id;
A
Alan Cox 已提交
2937 2938 2939 2940
	const struct ata_timing *s;
	struct ata_timing p;

	/*
2941
	 * Find the mode.
2942
	 */
A
Alan Cox 已提交
2943 2944 2945 2946

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

2947 2948
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2949 2950 2951 2952 2953
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

2954
	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
A
Alan Cox 已提交
2955
		memset(&p, 0, sizeof(p));
2956

2957
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
2958 2959 2960 2961 2962 2963 2964 2965
			if (speed <= XFER_PIO_2)
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
			else if ((speed <= XFER_PIO_4) ||
				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
			p.cycle = id[ATA_ID_EIDE_DMA_MIN];

A
Alan Cox 已提交
2966 2967 2968 2969 2970 2971 2972
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

2973
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2974 2975

	/*
2976 2977 2978
	 * 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
2979 2980
	 */

2981
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2982 2983 2984 2985 2986
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2987
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
	 */

	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
2999

3000 3001 3002 3003 3004
	/* 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
3005 3006 3007 3008

	return 0;
}

3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059
/**
 *	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;
}

3060 3061 3062
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3063
 *	@sel: ATA_DNXFER_* selector
3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074
 *
 *	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
 */
3075
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3076
{
3077
	char buf[32];
3078 3079
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3080
	int quiet, highbit;
3081

3082 3083
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3084

3085 3086 3087 3088
	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);
3089

3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141
	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);
	}
3142 3143 3144 3145 3146 3147 3148

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

	return 0;
}

T
Tejun Heo 已提交
3149
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3150
{
3151
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3152
	struct ata_eh_context *ehc = &dev->link->eh_context;
3153
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3154 3155
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3156
	unsigned int err_mask = 0;
3157
	int rc;
L
Linus Torvalds 已提交
3158

3159
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3160 3161 3162
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3163 3164 3165 3166 3167 3168 3169 3170 3171
	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
		dev_err_whine = " (SET_XFERMODE skipped)";
	else {
		if (nosetxfer)
			ata_dev_printk(dev, KERN_WARNING,
				       "NOSETXFER but PATA detected - can't "
				       "skip SETXFER, might malfunction\n");
		err_mask = ata_dev_set_xfermode(dev);
	}
3172

3173 3174 3175 3176 3177 3178 3179 3180 3181 3182
	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;

3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197
	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;
	}
3198 3199
	/* 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 */
3200
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3201 3202
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3203
		ign_dev_err = 1;
3204

3205 3206 3207
	/* 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
3208

3209 3210 3211 3212 3213 3214
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3215

3216 3217
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3218

3219 3220 3221 3222
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3223
	return 0;
3224 3225 3226 3227 3228

 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
3229 3230 3231
}

/**
3232
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3233
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3234
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3235
 *
3236 3237 3238
 *	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
3239
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3240
 *
L
Linus Torvalds 已提交
3241
 *	LOCKING:
J
Jeff Garzik 已提交
3242
 *	PCI/etc. bus probe sem.
3243 3244 3245
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3246
 */
3247

3248
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3249
{
3250
	struct ata_port *ap = link->ap;
3251
	struct ata_device *dev;
3252
	int rc = 0, used_dma = 0, found = 0;
3253

3254
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3255
	ata_for_each_dev(dev, link, ENABLED) {
3256
		unsigned long pio_mask, dma_mask;
3257
		unsigned int mode_mask;
3258

3259 3260 3261 3262 3263 3264
		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
3265
		ata_dev_xfermask(dev);
3266
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3267

3268 3269
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3270 3271 3272 3273 3274 3275

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

3276 3277
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3278

3279
		found = 1;
3280
		if (ata_dma_enabled(dev))
3281
			used_dma = 1;
3282
	}
3283
	if (!found)
3284
		goto out;
3285 3286

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3287
	ata_for_each_dev(dev, link, ENABLED) {
3288
		if (dev->pio_mode == 0xff) {
3289
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3290
			rc = -EINVAL;
3291
			goto out;
3292 3293 3294 3295 3296 3297 3298
		}

		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
3299

3300
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3301 3302
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3303 3304 3305 3306 3307 3308 3309
			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
3310 3311

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3312
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3313
		rc = ata_dev_set_mode(dev);
3314
		if (rc)
3315
			goto out;
3316
	}
L
Linus Torvalds 已提交
3317

3318 3319
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3320
	 */
J
Jeff Garzik 已提交
3321
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3322
		ap->host->simplex_claimed = ap;
3323

3324 3325 3326 3327
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3328 3329
}

3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353
/**
 *	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;
3354
	unsigned long nodev_deadline;
3355 3356
	int warned = 0;

3357 3358 3359 3360 3361 3362
	/* choose which 0xff timeout to use, read comment in libata.h */
	if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
	else
		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);

T
Tejun Heo 已提交
3363 3364 3365 3366 3367 3368
	/* 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);

3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379
	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;

3380 3381
		/*
		 * -ENODEV could be transient.  Ignore -ENODEV if link
3382
		 * is online.  Also, some SATA devices take a long
3383 3384 3385
		 * time to clear 0xff after reset.  Wait for
		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
		 * offline.
3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412
		 *
		 * 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;
		}

3413
		ata_msleep(link->ap, 50);
3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430
	}
}

/**
 *	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.
 */
3431
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3432 3433
				int (*check_ready)(struct ata_link *link))
{
3434
	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3435 3436 3437 3438

	return ata_wait_ready(link, deadline, check_ready);
}

3439
/**
3440 3441
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3442
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3443
 *	@deadline: deadline jiffies for the operation
3444
 *
3445
 *	Make sure SStatus of @link reaches stable state, determined by
3446 3447
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3448 3449
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3450 3451
 *	until timeout then returns 0 if DET is stable at 1.
 *
3452 3453 3454
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3455 3456 3457 3458 3459 3460
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3461 3462
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3463
{
3464 3465
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3466
	unsigned long last_jiffies, t;
3467 3468 3469
	u32 last, cur;
	int rc;

3470
	t = ata_deadline(jiffies, params[2]);
3471 3472 3473
	if (time_before(t, deadline))
		deadline = t;

3474
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3475 3476 3477 3478 3479 3480 3481
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3482
		ata_msleep(link->ap, interval);
3483
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3484 3485 3486 3487 3488
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3489
			if (cur == 1 && time_before(jiffies, deadline))
3490
				continue;
3491 3492
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3493 3494 3495 3496 3497 3498 3499 3500
				return 0;
			continue;
		}

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

3501 3502 3503
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3504
		if (time_after(jiffies, deadline))
3505
			return -EPIPE;
3506 3507 3508 3509
	}
}

/**
3510 3511
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3512
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3513
 *	@deadline: deadline jiffies for the operation
3514
 *
3515
 *	Resume SATA phy @link and debounce it.
3516 3517 3518 3519 3520 3521 3522
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3523 3524
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3525
{
3526
	int tries = ATA_LINK_RESUME_TRIES;
3527
	u32 scontrol, serror;
3528 3529
	int rc;

3530
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3531
		return rc;
3532

3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546
	/*
	 * Writes to SControl sometimes get ignored under certain
	 * controllers (ata_piix SIDPR).  Make sure DET actually is
	 * cleared.
	 */
	do {
		scontrol = (scontrol & 0x0f0) | 0x300;
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
			return rc;
		/*
		 * Some PHYs react badly if SStatus is pounded
		 * immediately after resuming.  Delay 200ms before
		 * debouncing.
		 */
3547
		ata_msleep(link->ap, 200);
3548

3549 3550 3551 3552
		/* is SControl restored correctly? */
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
			return rc;
	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3553

3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564
	if ((scontrol & 0xf0f) != 0x300) {
		ata_link_printk(link, KERN_ERR,
				"failed to resume link (SControl %X)\n",
				scontrol);
		return 0;
	}

	if (tries < ATA_LINK_RESUME_TRIES)
		ata_link_printk(link, KERN_WARNING,
				"link resume succeeded after %d retries\n",
				ATA_LINK_RESUME_TRIES - tries);
3565

3566 3567 3568
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3569
	/* clear SError, some PHYs require this even for SRST to work */
3570 3571 3572
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3573
	return rc != -EINVAL ? rc : 0;
3574 3575
}

3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641
/**
 *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
 *	@link: ATA link to manipulate SControl for
 *	@policy: LPM policy to configure
 *	@spm_wakeup: initiate LPM transition to active state
 *
 *	Manipulate the IPM field of the SControl register of @link
 *	according to @policy.  If @policy is ATA_LPM_MAX_POWER and
 *	@spm_wakeup is %true, the SPM field is manipulated to wake up
 *	the link.  This function also clears PHYRDY_CHG before
 *	returning.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 on succes, -errno otherwise.
 */
int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
		      bool spm_wakeup)
{
	struct ata_eh_context *ehc = &link->eh_context;
	bool woken_up = false;
	u32 scontrol;
	int rc;

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

	switch (policy) {
	case ATA_LPM_MAX_POWER:
		/* disable all LPM transitions */
		scontrol |= (0x3 << 8);
		/* initiate transition to active state */
		if (spm_wakeup) {
			scontrol |= (0x4 << 12);
			woken_up = true;
		}
		break;
	case ATA_LPM_MED_POWER:
		/* allow LPM to PARTIAL */
		scontrol &= ~(0x1 << 8);
		scontrol |= (0x2 << 8);
		break;
	case ATA_LPM_MIN_POWER:
		/* no restrictions on LPM transitions */
		scontrol &= ~(0x3 << 8);
		break;
	default:
		WARN_ON(1);
	}

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

	/* give the link time to transit out of LPM state */
	if (woken_up)
		msleep(10);

	/* clear PHYRDY_CHG from SError */
	ehc->i.serror &= ~SERR_PHYRDY_CHG;
	return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
}

3642
/**
3643
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3644
 *	@link: ATA link to be reset
3645
 *	@deadline: deadline jiffies for the operation
3646
 *
T
Tejun Heo 已提交
3647
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3648 3649 3650 3651
 *	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.
3652 3653 3654 3655 3656 3657 3658
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3659
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3660
{
T
Tejun Heo 已提交
3661
	struct ata_port *ap = link->ap;
3662
	struct ata_eh_context *ehc = &link->eh_context;
3663
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3664 3665 3666 3667 3668 3669
	int rc;

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

3670
	/* if SATA, resume link */
3671
	if (ap->flags & ATA_FLAG_SATA) {
3672
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3673 3674
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3675
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3676 3677 3678
					"link for reset (errno=%d)\n", rc);
	}

3679
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3680
	if (ata_phys_link_offline(link))
3681 3682
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3683 3684 3685
	return 0;
}

3686
/**
T
Tejun Heo 已提交
3687 3688 3689
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3690
 *	@deadline: deadline jiffies for the operation
3691 3692
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3693
 *
T
Tejun Heo 已提交
3694
 *	SATA phy-reset @link using DET bits of SControl register.
3695 3696 3697 3698 3699 3700 3701 3702
 *	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.
3703 3704 3705 3706 3707 3708 3709
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3710
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3711 3712
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3713
{
T
Tejun Heo 已提交
3714
	u32 scontrol;
3715
	int rc;
3716

3717 3718
	DPRINTK("ENTER\n");

3719 3720 3721
	if (online)
		*online = false;

3722
	if (sata_set_spd_needed(link)) {
3723 3724 3725 3726 3727
		/* 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.
		 */
3728
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3729
			goto out;
3730

3731
		scontrol = (scontrol & 0x0f0) | 0x304;
3732

3733
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3734
			goto out;
3735

3736
		sata_set_spd(link);
3737 3738 3739
	}

	/* issue phy wake/reset */
3740
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3741
		goto out;
3742

3743
	scontrol = (scontrol & 0x0f0) | 0x301;
3744

3745
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3746
		goto out;
3747

3748
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3749 3750
	 * 10.4.2 says at least 1 ms.
	 */
3751
	ata_msleep(link->ap, 1);
3752

3753 3754
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3755 3756 3757
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3758
	if (ata_phys_link_offline(link))
3759 3760 3761 3762 3763 3764
		goto out;

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

T
Tejun Heo 已提交
3765
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3766 3767 3768 3769 3770 3771 3772 3773
		/* 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;

3774 3775
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786
			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);
3787
 out:
3788 3789 3790 3791
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3792 3793
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3794
	}
3795 3796 3797 3798
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824
/**
 *	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;
}

3825
/**
3826
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3827
 *	@link: the target ata_link
3828 3829 3830 3831 3832 3833 3834 3835 3836
 *	@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)
 */
3837
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3838
{
3839 3840
	u32 serror;

3841 3842
	DPRINTK("ENTER\n");

3843 3844 3845 3846
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3847
	/* print link status */
3848
	sata_print_link_status(link);
3849 3850 3851 3852

	DPRINTK("EXIT\n");
}

3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868
/**
 *	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
3869 3870
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3871 3872
{
	const u16 *old_id = dev->id;
3873 3874
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3875 3876

	if (dev->class != new_class) {
3877 3878
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3879 3880 3881
		return 0;
	}

3882 3883 3884 3885
	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]));
3886 3887

	if (strcmp(model[0], model[1])) {
3888 3889
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3890 3891 3892 3893
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3894 3895
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3896 3897 3898 3899 3900 3901 3902
		return 0;
	}

	return 1;
}

/**
3903
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3904
 *	@dev: target ATA device
3905
 *	@readid_flags: read ID flags
3906 3907 3908 3909 3910 3911 3912 3913 3914 3915
 *
 *	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
 */
3916
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3917
{
3918
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3919
	u16 *id = (void *)dev->link->ap->sector_buf;
3920 3921
	int rc;

3922
	/* read ID data */
3923
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3924
	if (rc)
3925
		return rc;
3926 3927

	/* is the device still there? */
3928 3929
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3930

3931
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3932 3933 3934 3935 3936 3937
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3938
 *	@new_class: new class code
3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949
 *	@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
 */
3950 3951
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3952
{
3953
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
3954
	u64 n_native_sectors = dev->n_native_sectors;
3955 3956 3957 3958 3959
	int rc;

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

3960 3961
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
3962 3963 3964
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
3965 3966 3967 3968 3969 3970
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

3971 3972 3973 3974
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3975 3976

	/* configure device according to the new ID */
3977
	rc = ata_dev_configure(dev);
3978 3979 3980 3981
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
T
Tejun Heo 已提交
3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999
	if (dev->class != ATA_DEV_ATA || !n_sectors ||
	    dev->n_sectors == n_sectors)
		return 0;

	/* n_sectors has changed */
	ata_dev_printk(dev, KERN_WARNING, "n_sectors mismatch %llu != %llu\n",
		       (unsigned long long)n_sectors,
		       (unsigned long long)dev->n_sectors);

	/*
	 * Something could have caused HPA to be unlocked
	 * involuntarily.  If n_native_sectors hasn't changed and the
	 * new size matches it, keep the device.
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
		ata_dev_printk(dev, KERN_WARNING,
			       "new n_sectors matches native, probably "
4000 4001
			       "late HPA unlock, n_sectors updated\n");
		/* use the larger n_sectors */
T
Tejun Heo 已提交
4002
		return 0;
4003 4004
	}

T
Tejun Heo 已提交
4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021
	/*
	 * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
	 * unlocking HPA in those cases.
	 *
	 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
	    !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
		ata_dev_printk(dev, KERN_WARNING,
			       "old n_sectors matches native, probably "
			       "late HPA lock, will try to unlock HPA\n");
		/* try unlocking HPA */
		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
		rc = -EIO;
	} else
		rc = -ENODEV;
4022

T
Tejun Heo 已提交
4023 4024 4025
	/* restore original n_[native_]sectors and fail */
	dev->n_native_sectors = n_native_sectors;
	dev->n_sectors = n_sectors;
4026
 fail:
4027
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4028 4029 4030
	return rc;
}

4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047
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 },
4048
	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
4049 4050 4051 4052 4053
	{ "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 },
4054
	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
4055 4056 4057 4058 4059 4060 4061 4062 4063 4064
	{ "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 },
4065
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4066
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4067
	/* Odd clown on sil3726/4726 PMPs */
4068
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4069

4070
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4071
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4072
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4073

4074 4075 4076 4077
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4078
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4079
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4080 4081
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4082
	/* NCQ is broken */
4083
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4084
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4085
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4086
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4087
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4088

4089
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4090
	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4091
						ATA_HORKAGE_FIRMWARE_WARN },
4092

4093
	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4094 4095
						ATA_HORKAGE_FIRMWARE_WARN },

4096
	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4097 4098
						ATA_HORKAGE_FIRMWARE_WARN },

4099
	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4100 4101
						ATA_HORKAGE_FIRMWARE_WARN },

4102 4103 4104 4105 4106
	/* 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, },
4107

4108 4109 4110
	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },

4111 4112 4113 4114 4115
	/* 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 },
4116

T
Tejun Heo 已提交
4117 4118 4119
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4120 4121 4122
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4123
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4124

A
Alan Cox 已提交
4125 4126
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4127
	/* Maybe we should just blacklist TSSTcorp... */
4128
	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4129

4130 4131 4132
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4133 4134 4135
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },

4136 4137 4138 4139 4140
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
	{ "PIONEER DVD-RW  DVRTD08",	"1.00",	ATA_HORKAGE_NOSETXFER },
4141
	{ "PIONEER DVD-RW  DVR-212D",	"1.28", ATA_HORKAGE_NOSETXFER },
4142

4143 4144
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4145
};
4146

4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158
/**
 *	glob_match - match a text string against a glob-style pattern
 *	@text: the string to be examined
 *	@pattern: the glob-style pattern to be matched against
 *
 *	Either/both of text and pattern can be empty strings.
 *
 *	Match text against a glob-style pattern, with wildcards and simple sets:
 *
 *		?	matches any single character.
 *		*	matches any run of characters.
 *		[xyz]	matches a single character from the set: x, y, or z.
4159 4160
 *		[a-d]	matches a single character from the range: a, b, c, or d.
 *		[a-d0-9] matches a single character from either range.
4161
 *
4162 4163
 *	The special characters ?, [, -, or *, can be matched using a set, eg. [*]
 *	Behaviour with malformed patterns is undefined, though generally reasonable.
4164
 *
4165
 *	Sample patterns:  "SD1?",  "SD1[0-5]",  "*R0",  "SD*1?[012]*xx"
4166 4167 4168 4169 4170 4171 4172 4173 4174
 *
 *	This function uses one level of recursion per '*' in pattern.
 *	Since it calls _nothing_ else, and has _no_ explicit local variables,
 *	this will not cause stack problems for any reasonable use here.
 *
 *	RETURNS:
 *	0 on match, 1 otherwise.
 */
static int glob_match (const char *text, const char *pattern)
4175
{
4176 4177 4178 4179 4180 4181 4182 4183 4184
	do {
		/* Match single character or a '?' wildcard */
		if (*text == *pattern || *pattern == '?') {
			if (!*pattern++)
				return 0;  /* End of both strings: match */
		} else {
			/* Match single char against a '[' bracketed ']' pattern set */
			if (!*text || *pattern != '[')
				break;  /* Not a pattern set */
4185 4186 4187 4188 4189 4190 4191
			while (*++pattern && *pattern != ']' && *text != *pattern) {
				if (*pattern == '-' && *(pattern - 1) != '[')
					if (*text > *(pattern - 1) && *text < *(pattern + 1)) {
						++pattern;
						break;
					}
			}
4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206
			if (!*pattern || *pattern == ']')
				return 1;  /* No match */
			while (*pattern && *pattern++ != ']');
		}
	} while (*++text && *pattern);

	/* Match any run of chars against a '*' wildcard */
	if (*pattern == '*') {
		if (!*++pattern)
			return 0;  /* Match: avoid recursion at end of pattern */
		/* Loop to handle additional pattern chars after the wildcard */
		while (*text) {
			if (glob_match(text, pattern) == 0)
				return 0;  /* Remainder matched */
			++text;  /* Absorb (match) this char and try again */
4207 4208
		}
	}
4209 4210 4211
	if (!*text && !*pattern)
		return 0;  /* End of both strings: match */
	return 1;  /* No match */
4212
}
4213

T
Tejun Heo 已提交
4214
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4215
{
T
Tejun Heo 已提交
4216 4217
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4218
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4219

T
Tejun Heo 已提交
4220 4221
	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
4222

4223
	while (ad->model_num) {
4224
		if (!glob_match(model_num, ad->model_num)) {
4225 4226
			if (ad->model_rev == NULL)
				return ad->horkage;
4227
			if (!glob_match(model_rev, ad->model_rev))
4228
				return ad->horkage;
4229
		}
4230
		ad++;
4231
	}
L
Linus Torvalds 已提交
4232 4233 4234
	return 0;
}

4235 4236 4237 4238 4239 4240
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
4241
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4242 4243
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4244
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4245 4246
}

A
Alan Cox 已提交
4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261
/**
 *	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);
}

4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279
/**
 *	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
4280
	/* If the controller thinks we are 40 wire, we are. */
4281 4282
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4283 4284

	/* If the controller thinks we are 80 wire, we are. */
4285 4286
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4287 4288 4289 4290 4291

	/* 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
4292 4293
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4294 4295 4296 4297 4298 4299 4300 4301 4302 4303

	/* 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
Tejun Heo 已提交
4304 4305 4306
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4307 4308 4309 4310 4311 4312
				return 0;
		}
	}
	return 1;
}

4313 4314 4315 4316
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4317 4318 4319 4320
 *	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...
4321 4322 4323 4324
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4325
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4326
{
T
Tejun Heo 已提交
4327 4328
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4329
	struct ata_host *host = ap->host;
4330
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4331

4332
	/* controller modes available */
4333 4334 4335
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4336
	/* drive modes available */
4337 4338 4339
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4340

4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351
	/*
	 *	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));
	}

4352 4353
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4354 4355
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4356
	}
4357

4358
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4359
	    host->simplex_claimed && host->simplex_claimed != ap) {
4360 4361 4362
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4363
	}
4364

J
Jeff Garzik 已提交
4365 4366 4367
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4368
	if (ap->ops->mode_filter)
4369
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4370

4371 4372 4373 4374 4375 4376 4377 4378 4379 4380
	/* 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 */
4381
		if (cable_is_40wire(ap)) {
4382
			ata_dev_printk(dev, KERN_WARNING,
4383 4384 4385 4386
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4387 4388
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4389 4390 4391 4392 4393 4394
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4395 4396 4397
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4398
 *	LOCKING:
J
Jeff Garzik 已提交
4399
 *	PCI/etc. bus probe sem.
4400 4401 4402
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4403 4404
 */

T
Tejun Heo 已提交
4405
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4406
{
4407
	struct ata_taskfile tf;
4408
	unsigned int err_mask;
L
Linus Torvalds 已提交
4409 4410 4411 4412

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

T
Tejun Heo 已提交
4413 4414 4415
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4416
	ata_tf_init(dev, &tf);
4417 4418
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4419
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4420
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4421
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4422 4423
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4424 4425
	/* 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
4426
		tf.nsect = 0x01;
A
Alan Cox 已提交
4427 4428
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4429

4430
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4431 4432 4433 4434

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
4435

4436
/**
4437
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4438 4439
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4440
 *	@feature: The sector count represents the feature to set
4441 4442
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4443
 *	on port @ap with sector count
4444 4445 4446 4447 4448 4449 4450
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4451
unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463
{
	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;
4464
	tf.nsect = feature;
4465

4466
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4467

4468 4469
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4470 4471
}

4472 4473 4474
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4475 4476
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4477 4478
 *
 *	LOCKING:
4479 4480 4481 4482
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4483
 */
T
Tejun Heo 已提交
4484 4485
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4486
{
4487
	struct ata_taskfile tf;
4488
	unsigned int err_mask;
4489 4490 4491

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4492
		return AC_ERR_INVALID;
4493 4494 4495 4496

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

T
Tejun Heo 已提交
4497
	ata_tf_init(dev, &tf);
4498 4499 4500 4501 4502
	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 */
4503

4504
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4505 4506 4507 4508 4509
	/* 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;
4510

4511 4512
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4513 4514
}

L
Linus Torvalds 已提交
4515
/**
J
Jeff Garzik 已提交
4516 4517 4518 4519
 *	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
4520 4521
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4522
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4523
 */
4524
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4525 4526
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4527
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4528 4529
	int dir = qc->dma_dir;

4530
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4531

4532
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4533

4534
	if (qc->n_elem)
4535
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4536 4537

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4538
	qc->sg = NULL;
L
Linus Torvalds 已提交
4539 4540 4541
}

/**
4542
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4543 4544
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4545 4546 4547 4548
 *	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
4549
 *	LOCKING:
T
Tejun Heo 已提交
4550 4551 4552 4553 4554
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4555
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4556 4557
{
	struct ata_port *ap = qc->ap;
4558

T
Tejun Heo 已提交
4559 4560 4561
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4562 4563
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4564
		return 1;
4565

T
Tejun Heo 已提交
4566 4567
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4568

T
Tejun Heo 已提交
4569 4570
	return 0;
}
L
Linus Torvalds 已提交
4571

T
Tejun Heo 已提交
4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589
/**
 *	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;
4590

T
Tejun Heo 已提交
4591 4592 4593 4594 4595 4596 4597
	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;
	}
4598

T
Tejun Heo 已提交
4599 4600
	return ATA_DEFER_LINK;
}
4601

T
Tejun Heo 已提交
4602
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4603

T
Tejun Heo 已提交
4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623
/**
 *	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;
}
4624

T
Tejun Heo 已提交
4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641
/**
 *	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
4642

T
Tejun Heo 已提交
4643
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4644

T
Tejun Heo 已提交
4645 4646 4647
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4648

T
Tejun Heo 已提交
4649
	DPRINTK("%d sg elements mapped\n", n_elem);
4650
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4651 4652
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4653

T
Tejun Heo 已提交
4654
	return 0;
L
Linus Torvalds 已提交
4655 4656
}

T
Tejun Heo 已提交
4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669
/**
 *	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)
4670
{
T
Tejun Heo 已提交
4671 4672
#ifdef __BIG_ENDIAN
	unsigned int i;
4673

T
Tejun Heo 已提交
4674 4675 4676
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4677 4678
}

4679 4680
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4681
 *	@ap: target port
4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708
 *
 *	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
4709 4710 4711 4712 4713
/**
 *	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
4714
 *	None.
L
Linus Torvalds 已提交
4715 4716
 */

4717
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4718
{
T
Tejun Heo 已提交
4719
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4720 4721
	struct ata_queued_cmd *qc;

4722
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4723 4724 4725 4726 4727
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4728
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4729 4730 4731 4732 4733
	}

	return qc;
}

4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745
/**
 *	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)
{
4746
	struct ata_port *ap;
4747 4748
	unsigned int tag;

4749
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4750
	ap = qc->ap;
4751 4752 4753 4754 4755 4756 4757 4758 4759

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

4760
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4761
{
4762 4763
	struct ata_port *ap;
	struct ata_link *link;
4764

4765 4766
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4767 4768
	ap = qc->ap;
	link = qc->dev->link;
L
Linus Torvalds 已提交
4769 4770 4771 4772

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

4773
	/* command should be marked inactive atomically with qc completion */
4774
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4775
		link->sactive &= ~(1 << qc->tag);
4776 4777 4778
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4779
		link->active_tag = ATA_TAG_POISON;
4780 4781 4782 4783 4784 4785 4786
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4787

4788 4789 4790 4791 4792
	/* 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;
4793
	ap->qc_active &= ~(1 << qc->tag);
4794

L
Linus Torvalds 已提交
4795
	/* call completion callback */
4796
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4797 4798
}

4799 4800 4801 4802 4803
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4804
	ap->ops->qc_fill_rtf(qc);
4805 4806
}

4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

	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;
}

4820 4821 4822 4823
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
4824 4825 4826 4827 4828 4829 4830
 *	Indicate to the mid and upper layers that an ATA command has
 *	completed, with either an ok or not-ok status.
 *
 *	Refrain from calling this function multiple times when
 *	successfully completing multiple NCQ commands.
 *	ata_qc_complete_multiple() should be used instead, which will
 *	properly update IRQ expect state.
4831 4832
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4833
 *	spin_lock_irqsave(host lock)
4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852
 */
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) {
4853 4854 4855
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4856 4857 4858
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

4859 4860 4861 4862 4863
		/*
		 * Finish internal commands without any further processing
		 * and always with the result TF filled.
		 */
		if (unlikely(ata_tag_internal(qc->tag))) {
4864
			fill_result_tf(qc);
4865 4866 4867
			__ata_qc_complete(qc);
			return;
		}
4868

4869 4870 4871 4872 4873 4874 4875
		/*
		 * Non-internal qc has failed.  Fill the result TF and
		 * summon EH.
		 */
		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			fill_result_tf(qc);
			ata_qc_schedule_eh(qc);
4876
			return;
4877 4878
		}

4879 4880
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

4881 4882
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4883
			fill_result_tf(qc);
4884

4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899
		/* 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;
4900 4901 4902 4903

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4904 4905
		}

4906 4907 4908
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4909 4910 4911 4912 4913 4914 4915
		__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)
4916
			fill_result_tf(qc);
4917 4918 4919 4920 4921

		__ata_qc_complete(qc);
	}
}

4922 4923 4924 4925 4926 4927 4928 4929 4930 4931
/**
 *	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.
 *
4932 4933 4934 4935
 *	Always use this function when completing multiple NCQ commands
 *	from IRQ handlers instead of calling ata_qc_complete()
 *	multiple times to keep IRQ expect status properly in sync.
 *
4936
 *	LOCKING:
J
Jeff Garzik 已提交
4937
 *	spin_lock_irqsave(host lock)
4938 4939 4940 4941
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4942
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954
{
	int nr_done = 0;
	u32 done_mask;

	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;
	}

4955
	while (done_mask) {
4956
		struct ata_queued_cmd *qc;
4957
		unsigned int tag = __ffs(done_mask);
4958

4959 4960
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
4961 4962 4963
			ata_qc_complete(qc);
			nr_done++;
		}
4964
		done_mask &= ~(1 << tag);
4965 4966 4967 4968 4969
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4970 4971 4972 4973 4974 4975 4976 4977 4978 4979
/**
 *	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
4980
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4981
 */
4982
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4983 4984
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4985
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
4986
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
4987

4988 4989 4990 4991
	/* 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.
	 */
4992
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4993

4994
	if (ata_is_ncq(prot)) {
4995
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
4996 4997 4998

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
4999
		link->sactive |= 1 << qc->tag;
5000
	} else {
5001
		WARN_ON_ONCE(link->sactive);
5002 5003

		ap->nr_active_links++;
T
Tejun Heo 已提交
5004
		link->active_tag = qc->tag;
5005 5006
	}

5007
	qc->flags |= ATA_QCFLAG_ACTIVE;
5008
	ap->qc_active |= 1 << qc->tag;
5009

5010 5011
	/*
	 * We guarantee to LLDs that they will have at least one
5012 5013
	 * non-zero sg if the command is a data command.
	 */
5014 5015 5016
	if (WARN_ON_ONCE(ata_is_data(prot) &&
			 (!qc->sg || !qc->n_elem || !qc->nbytes)))
		goto sys_err;
5017

T
Tejun Heo 已提交
5018
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5019
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5020
		if (ata_sg_setup(qc))
5021
			goto sys_err;
L
Linus Torvalds 已提交
5022

T
Tejun Heo 已提交
5023
	/* if device is sleeping, schedule reset and abort the link */
5024
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5025
		link->eh_info.action |= ATA_EH_RESET;
5026 5027 5028 5029 5030
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5031 5032
	ap->ops->qc_prep(qc);

5033 5034 5035 5036
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5037

5038
sys_err:
5039 5040 5041
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5042 5043
}

5044 5045
/**
 *	sata_scr_valid - test whether SCRs are accessible
5046
 *	@link: ATA link to test SCR accessibility for
5047
 *
5048
 *	Test whether SCRs are accessible for @link.
5049 5050 5051 5052 5053 5054 5055
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5056
int sata_scr_valid(struct ata_link *link)
5057
{
5058 5059
	struct ata_port *ap = link->ap;

5060
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5061 5062 5063 5064
}

/**
 *	sata_scr_read - read SCR register of the specified port
5065
 *	@link: ATA link to read SCR for
5066 5067 5068
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5069
 *	Read SCR register @reg of @link into *@val.  This function is
5070 5071
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5072 5073
 *
 *	LOCKING:
5074
 *	None if @link is ap->link.  Kernel thread context otherwise.
5075 5076 5077 5078
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5079
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5080
{
5081 5082
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5083
			return link->ap->ops->scr_read(link, reg, val);
5084 5085 5086 5087
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5088 5089 5090 5091
}

/**
 *	sata_scr_write - write SCR register of the specified port
5092
 *	@link: ATA link to write SCR for
5093 5094 5095
 *	@reg: SCR to write
 *	@val: value to write
 *
5096
 *	Write @val to SCR register @reg of @link.  This function is
5097 5098
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5099 5100
 *
 *	LOCKING:
5101
 *	None if @link is ap->link.  Kernel thread context otherwise.
5102 5103 5104 5105
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5106
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5107
{
5108 5109
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5110
			return link->ap->ops->scr_write(link, reg, val);
5111 5112
		return -EOPNOTSUPP;
	}
5113

5114
	return sata_pmp_scr_write(link, reg, val);
5115 5116 5117 5118
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5119
 *	@link: ATA link to write SCR for
5120 5121 5122 5123 5124 5125 5126
 *	@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:
5127
 *	None if @link is ap->link.  Kernel thread context otherwise.
5128 5129 5130 5131
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5132
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5133
{
5134 5135
	if (ata_is_host_link(link)) {
		int rc;
5136

5137
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5138
			rc = link->ap->ops->scr_write(link, reg, val);
5139
			if (rc == 0)
T
Tejun Heo 已提交
5140
				rc = link->ap->ops->scr_read(link, reg, &val);
5141 5142 5143
			return rc;
		}
		return -EOPNOTSUPP;
5144
	}
5145 5146

	return sata_pmp_scr_write(link, reg, val);
5147 5148 5149
}

/**
T
Tejun Heo 已提交
5150
 *	ata_phys_link_online - test whether the given link is online
5151
 *	@link: ATA link to test
5152
 *
5153 5154 5155
 *	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).
5156 5157 5158 5159 5160
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5161
 *	True if the port online status is available and online.
5162
 */
T
Tejun Heo 已提交
5163
bool ata_phys_link_online(struct ata_link *link)
5164 5165 5166
{
	u32 sstatus;

5167
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5168
	    ata_sstatus_online(sstatus))
5169 5170
		return true;
	return false;
5171 5172 5173
}

/**
T
Tejun Heo 已提交
5174
 *	ata_phys_link_offline - test whether the given link is offline
5175
 *	@link: ATA link to test
5176
 *
5177 5178 5179
 *	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).
5180 5181 5182 5183 5184
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5185
 *	True if the port offline status is available and offline.
5186
 */
T
Tejun Heo 已提交
5187
bool ata_phys_link_offline(struct ata_link *link)
5188 5189 5190
{
	u32 sstatus;

5191
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5192
	    !ata_sstatus_online(sstatus))
5193 5194
		return true;
	return false;
5195
}
E
Edward Falk 已提交
5196

T
Tejun Heo 已提交
5197 5198 5199 5200 5201 5202 5203 5204 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
/**
 *	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));
}

5249
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5250 5251 5252
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5253 5254 5255 5256
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5257 5258
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5259
		struct ata_link *link;
5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278

		/* 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
5279
		ata_for_each_link(link, ap, HOST_FIRST) {
5280 5281 5282
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300

		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
5301 5302
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5303 5304
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5305
 *	Suspend @host.  Actual operation is performed by EH.  This
5306 5307 5308 5309 5310 5311 5312 5313 5314
 *	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
5315
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5316
{
5317
	unsigned int ehi_flags = ATA_EHI_QUIET;
5318
	int rc;
5319

5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331
	/*
	 * On some hardware, device fails to respond after spun down
	 * for suspend.  As the device won't be used before being
	 * resumed, we don't need to touch the device.  Ask EH to skip
	 * the usual stuff and proceed directly to suspend.
	 *
	 * http://thread.gmane.org/gmane.linux.ide/46764
	 */
	if (mesg.event == PM_EVENT_SUSPEND)
		ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;

	rc = ata_host_request_pm(host, mesg, 0, ehi_flags, 1);
5332 5333
	if (rc == 0)
		host->dev->power.power_state = mesg;
5334 5335 5336 5337
	return rc;
}

/**
J
Jeff Garzik 已提交
5338 5339
 *	ata_host_resume - resume host
 *	@host: host to resume
5340
 *
J
Jeff Garzik 已提交
5341
 *	Resume @host.  Actual operation is performed by EH.  This
5342 5343 5344 5345 5346 5347
 *	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
5348
void ata_host_resume(struct ata_host *host)
5349
{
T
Tejun Heo 已提交
5350
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5351
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5352
	host->dev->power.power_state = PMSG_ON;
5353
}
5354
#endif
5355

5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366
/**
 *	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
5367
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5368
	struct ata_port *ap = link->ap;
5369 5370
	unsigned long flags;

T
Tejun Heo 已提交
5371
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5372 5373
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5374

5375 5376
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5377
	 * host lock.
5378
	 */
5379
	spin_lock_irqsave(ap->lock, flags);
5380
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5381
	dev->horkage = 0;
5382
	spin_unlock_irqrestore(ap->lock, flags);
5383

5384 5385
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5386 5387 5388 5389 5390
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5391 5392 5393 5394
/**
 *	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
5395
 *	@pmp: Port multiplier port number
5396 5397 5398 5399 5400 5401
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5402
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5403 5404 5405 5406
{
	int i;

	/* clear everything except for devices */
G
Gwendal Grignou 已提交
5407 5408
	memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
	       ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5409 5410

	link->ap = ap;
T
Tejun Heo 已提交
5411
	link->pmp = pmp;
5412 5413 5414 5415 5416 5417 5418 5419 5420
	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;
T
Tejun Heo 已提交
5421 5422 5423
#ifdef CONFIG_ATA_ACPI
		dev->gtf_filter = ata_acpi_gtf_filter;
#endif
5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440
		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.
 */
5441
int sata_link_init_spd(struct ata_link *link)
5442
{
5443
	u8 spd;
5444 5445
	int rc;

T
Tejun Heo 已提交
5446
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5447 5448 5449
	if (rc)
		return rc;

T
Tejun Heo 已提交
5450
	spd = (link->saved_scontrol >> 4) & 0xf;
5451 5452 5453
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5454
	ata_force_link_limits(link);
5455

5456 5457 5458 5459 5460
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5461
/**
5462 5463
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5464
 *
5465 5466 5467 5468
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5469
 *
L
Linus Torvalds 已提交
5470
 *	LOCKING:
5471
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5472
 */
5473
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5474
{
5475
	struct ata_port *ap;
L
Linus Torvalds 已提交
5476

5477 5478 5479 5480 5481
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;
5482

5483
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5484
	ap->lock = &host->lock;
5485
	ap->print_id = -1;
J
Jeff Garzik 已提交
5486
	ap->host = host;
5487
	ap->dev = host->dev;
5488 5489 5490 5491 5492 5493

#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
5494
#else
5495
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5496
#endif
L
Linus Torvalds 已提交
5497

5498
	mutex_init(&ap->scsi_scan_mutex);
5499 5500
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5501
	INIT_LIST_HEAD(&ap->eh_done_q);
5502
	init_waitqueue_head(&ap->eh_wait_q);
5503
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5504 5505 5506
	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
5507

5508 5509
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5510
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5511 5512 5513 5514 5515

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
5516 5517
	ata_sff_port_init(ap);

L
Linus Torvalds 已提交
5518 5519 5520
	return ap;
}

5521 5522 5523 5524 5525
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5526 5527 5528
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5529 5530 5531 5532
		if (!ap)
			continue;

		if (ap->scsi_host)
5533 5534
			scsi_host_put(ap->scsi_host);

5535
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5536
		kfree(ap->slave_link);
5537
		kfree(ap);
5538 5539 5540
		host->ports[i] = NULL;
	}

5541
	dev_set_drvdata(gendev, NULL);
5542 5543
}

5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585
/**
 *	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);
5586
	mutex_init(&host->eh_mutex);
5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609
	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;
}

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

5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737
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);
}

5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759
/**
 *	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)
{
5760
	static DEFINE_SPINLOCK(lock);
5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787
	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);
}

5788 5789 5790 5791 5792 5793 5794
/**
 *	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
5795 5796
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5797 5798 5799 5800 5801 5802 5803 5804 5805
 *
 *	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)
{
5806 5807
	int have_stop = 0;
	void *start_dr = NULL;
5808 5809 5810 5811 5812
	int i, rc;

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

5813 5814
	ata_finalize_port_ops(host->ops);

5815 5816 5817
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5818 5819
		ata_finalize_port_ops(ap->ops);

5820 5821 5822
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838
		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];

5839 5840 5841
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5842
				if (rc != -ENODEV)
A
Andrew Morton 已提交
5843 5844 5845
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
5846 5847 5848 5849 5850 5851
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5852 5853
	if (start_dr)
		devres_add(host->dev, start_dr);
5854 5855 5856 5857 5858 5859 5860 5861 5862 5863
	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);
	}
5864
	devres_free(start_dr);
5865 5866 5867
	return rc;
}

5868
/**
J
Jeff Garzik 已提交
5869 5870 5871 5872 5873
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5874 5875 5876 5877 5878
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5879
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5880
void ata_host_init(struct ata_host *host, struct device *dev,
5881
		   unsigned long flags, struct ata_port_operations *ops)
5882
{
J
Jeff Garzik 已提交
5883
	spin_lock_init(&host->lock);
5884
	mutex_init(&host->eh_mutex);
J
Jeff Garzik 已提交
5885 5886 5887
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5888 5889
}

5890
int ata_port_probe(struct ata_port *ap)
5891
{
5892
	int rc = 0;
5893

5894 5895 5896 5897 5898 5899 5900 5901 5902
	/* probe */
	if (ap->ops->error_handler) {
		struct ata_eh_info *ehi = &ap->link.eh_info;
		unsigned long flags;

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

		ehi->probe_mask |= ATA_ALL_DEVICES;
5903
		ehi->action |= ATA_EH_RESET;
5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918
		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);
	}
5919 5920 5921 5922 5923 5924 5925
	return rc;
}


static void async_port_probe(void *data, async_cookie_t cookie)
{
	struct ata_port *ap = data;
5926

5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937
	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
	 */
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
		async_synchronize_cookie(cookie);

	(void)ata_port_probe(ap);
5938 5939 5940 5941 5942

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

	ata_scsi_scan_host(ap, 1);
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 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983
/**
 *	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++;

5984

G
Gwendal Grignou 已提交
5985 5986 5987 5988 5989 5990 5991 5992
	/* Create associated sysfs transport objects  */
	for (i = 0; i < host->n_ports; i++) {
		rc = ata_tport_add(host->dev,host->ports[i]);
		if (rc) {
			goto err_tadd;
		}
	}

5993 5994
	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
G
Gwendal Grignou 已提交
5995
		goto err_tadd;
5996

5997 5998 5999
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6000 6001 6002 6003 6004 6005 6006 6007 6008 6009
	/* 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 */
6010
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6011 6012
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6013

6014
		/* print per-port info to dmesg */
6015 6016 6017
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6018
		if (!ata_port_is_dummy(ap)) {
6019 6020
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6021
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6022
					ata_mode_string(xfer_mask),
6023
					ap->link.eh_info.desc);
6024 6025
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6026 6027 6028
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

V
Vegard Nossum 已提交
6029
	/* perform each probe asynchronously */
6030 6031
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6032
		async_schedule(async_port_probe, ap);
6033 6034 6035
	}

	return 0;
G
Gwendal Grignou 已提交
6036 6037 6038 6039 6040 6041 6042

 err_tadd:
	while (--i >= 0) {
		ata_tport_delete(host->ports[i]);
	}
	return rc;

6043 6044
}

6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057
/**
 *	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.
 *
6058 6059 6060 6061
 *	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.
 *
6062 6063 6064 6065 6066 6067 6068 6069 6070 6071
 *	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)
{
6072
	int i, rc;
6073 6074 6075 6076 6077

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

6078 6079 6080 6081 6082 6083
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6084 6085 6086 6087 6088
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6089 6090
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6091

6092 6093 6094 6095 6096 6097 6098 6099
	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;
}

6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110
/**
 *	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).
 */
6111
static void ata_port_detach(struct ata_port *ap)
6112 6113 6114 6115
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6116
		goto skip_eh;
6117 6118

	/* tell EH we're leaving & flush EH */
6119
	spin_lock_irqsave(ap->lock, flags);
6120
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6121
	ata_port_schedule_eh(ap);
6122
	spin_unlock_irqrestore(ap->lock, flags);
6123

T
Tejun Heo 已提交
6124
	/* wait till EH commits suicide */
6125 6126
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6127 6128
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6129

6130
	cancel_delayed_work_sync(&ap->hotplug_task);
6131

6132
 skip_eh:
G
Gwendal Grignou 已提交
6133 6134 6135 6136 6137 6138 6139
	if (ap->pmp_link) {
		int i;
		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
			ata_tlink_delete(&ap->pmp_link[i]);
	}
	ata_tport_delete(ap);

6140
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6141
	scsi_remove_host(ap->scsi_host);
6142 6143
}

T
Tejun Heo 已提交
6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158
/**
 *	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]);
6159 6160 6161

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6162 6163
}

6164 6165
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6166 6167 6168 6169
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6170 6171 6172
 *	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
6173 6174 6175 6176
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6177
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6178
{
6179
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6180
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6181

T
Tejun Heo 已提交
6182
	ata_host_detach(host);
L
Linus Torvalds 已提交
6183 6184 6185
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6186
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217
{
	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
6218

6219
#ifdef CONFIG_PM
6220
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6221 6222
{
	pci_save_state(pdev);
6223
	pci_disable_device(pdev);
6224

6225
	if (mesg.event & PM_EVENT_SLEEP)
6226
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6227 6228
}

6229
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6230
{
6231 6232
	int rc;

J
Jens Axboe 已提交
6233 6234
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6235

T
Tejun Heo 已提交
6236
	rc = pcim_enable_device(pdev);
6237 6238 6239 6240 6241 6242
	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
6243
	pci_set_master(pdev);
6244
	return 0;
6245 6246
}

6247
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6248
{
J
Jeff Garzik 已提交
6249
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6250 6251
	int rc = 0;

J
Jeff Garzik 已提交
6252
	rc = ata_host_suspend(host, mesg);
6253 6254 6255
	if (rc)
		return rc;

6256
	ata_pci_device_do_suspend(pdev, mesg);
6257 6258 6259 6260 6261 6262

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6263
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6264
	int rc;
6265

6266 6267 6268 6269
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6270
}
6271 6272
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6273 6274
#endif /* CONFIG_PCI */

6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294
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 },
6295
		{ "dump_id",	.horkage_on	= ATA_HORKAGE_DUMP_ID },
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
		{ "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) },
6330 6331 6332
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 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
	};
	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
6453 6454 6455

static int __init ata_init(void)
{
G
Gwendal Grignou 已提交
6456
	int rc;
6457

6458 6459
	ata_parse_force_param();

6460
	rc = ata_sff_init();
6461 6462 6463 6464
	if (rc) {
		kfree(ata_force_tbl);
		return rc;
	}
6465

G
Gwendal Grignou 已提交
6466 6467 6468 6469 6470 6471
	libata_transport_init();
	ata_scsi_transport_template = ata_attach_transport();
	if (!ata_scsi_transport_template) {
		ata_sff_exit();
		rc = -ENOMEM;
		goto err_out;
6472
	}
G
Gwendal Grignou 已提交
6473

L
Linus Torvalds 已提交
6474 6475
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
G
Gwendal Grignou 已提交
6476 6477 6478

err_out:
	return rc;
L
Linus Torvalds 已提交
6479 6480 6481 6482
}

static void __exit ata_exit(void)
{
G
Gwendal Grignou 已提交
6483 6484
	ata_release_transport(ata_scsi_transport_template);
	libata_transport_exit();
6485
	ata_sff_exit();
6486
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6487 6488
}

6489
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6490 6491
module_exit(ata_exit);

A
Akinobu Mita 已提交
6492
static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
6493 6494 6495

int ata_ratelimit(void)
{
A
Akinobu Mita 已提交
6496
	return __ratelimit(&ratelimit);
6497 6498
}

6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512
/**
 *	ata_msleep - ATA EH owner aware msleep
 *	@ap: ATA port to attribute the sleep to
 *	@msecs: duration to sleep in milliseconds
 *
 *	Sleeps @msecs.  If the current task is owner of @ap's EH, the
 *	ownership is released before going to sleep and reacquired
 *	after the sleep is complete.  IOW, other ports sharing the
 *	@ap->host will be allowed to own the EH while this task is
 *	sleeping.
 *
 *	LOCKING:
 *	Might sleep.
 */
6513 6514
void ata_msleep(struct ata_port *ap, unsigned int msecs)
{
6515 6516 6517 6518 6519
	bool owns_eh = ap && ap->host->eh_owner == current;

	if (owns_eh)
		ata_eh_release(ap);

6520
	msleep(msecs);
6521 6522 6523

	if (owns_eh)
		ata_eh_acquire(ap);
6524 6525
}

6526 6527
/**
 *	ata_wait_register - wait until register value changes
6528
 *	@ap: ATA port to wait register for, can be NULL
6529 6530 6531
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6532 6533
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549
 *
 *	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.
 */
6550
u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
6551
		      unsigned long interval, unsigned long timeout)
6552
{
6553
	unsigned long deadline;
6554 6555 6556 6557 6558 6559 6560 6561
	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.
	 */
6562
	deadline = ata_deadline(jiffies, timeout);
6563

6564
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6565
		ata_msleep(ap, interval);
6566 6567 6568 6569 6570 6571
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6572 6573 6574
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6575
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6576
{
T
Tejun Heo 已提交
6577
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6578 6579
}

T
Tejun Heo 已提交
6580
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6581
{
T
Tejun Heo 已提交
6582
	/* truly dummy */
T
Tejun Heo 已提交
6583 6584
}

6585
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6586 6587
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6588
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6589 6590
};

6591 6592 6593 6594
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6595 6596 6597 6598 6599 6600
/*
 * 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.
 */
6601 6602 6603
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6604 6605
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6606
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6607
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6608 6609
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6610
EXPORT_SYMBOL_GPL(ata_std_bios_param);
6611
EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
J
Jeff Garzik 已提交
6612
EXPORT_SYMBOL_GPL(ata_host_init);
6613
EXPORT_SYMBOL_GPL(ata_host_alloc);
6614
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6615
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6616
EXPORT_SYMBOL_GPL(ata_host_start);
6617
EXPORT_SYMBOL_GPL(ata_host_register);
6618
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6619
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6620
EXPORT_SYMBOL_GPL(ata_sg_init);
6621
EXPORT_SYMBOL_GPL(ata_qc_complete);
6622
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6623
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6624 6625
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6626 6627 6628 6629 6630 6631 6632
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);
6633
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6634
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6635
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6636
EXPORT_SYMBOL_GPL(ata_dev_disable);
6637
EXPORT_SYMBOL_GPL(sata_set_spd);
6638
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6639 6640
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6641
EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
6642
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6643
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6644
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6645
EXPORT_SYMBOL_GPL(ata_std_postreset);
6646 6647
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
6648
EXPORT_SYMBOL_GPL(ata_ratelimit);
6649
EXPORT_SYMBOL_GPL(ata_msleep);
6650
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6651 6652
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6653
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6654
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6655 6656 6657 6658
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);
6659 6660
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6661
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6662 6663
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6664
#endif /* CONFIG_PM */
6665 6666
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6667
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6668 6669
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6670
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6671
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6672 6673
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6674
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6675

L
Linus Torvalds 已提交
6676 6677 6678
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6679
#ifdef CONFIG_PM
6680 6681
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6682 6683
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6684
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6685
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6686

T
Tejun Heo 已提交
6687 6688 6689
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6690 6691 6692 6693
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6694
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6695
EXPORT_SYMBOL_GPL(ata_link_abort);
6696
EXPORT_SYMBOL_GPL(ata_port_abort);
6697
EXPORT_SYMBOL_GPL(ata_port_freeze);
6698
EXPORT_SYMBOL_GPL(sata_async_notification);
6699 6700
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6701 6702
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6703
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6704
EXPORT_SYMBOL_GPL(ata_do_eh);
6705
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6706 6707 6708 6709

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6710
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6711
EXPORT_SYMBOL_GPL(ata_cable_sata);