libata-core.c 170.0 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/byteorder.h>
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#include <linux/cdrom.h>
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#include "libata.h"

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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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const struct ata_port_operations ata_base_port_ops = {
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	.prereset		= ata_std_prereset,
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	.postreset		= ata_std_postreset,
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	.error_handler		= ata_std_error_handler,
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};

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

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

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

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struct workqueue_struct *ata_aux_wq;

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

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

static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;

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

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static int atapi_enabled = 1;
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module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");

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

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

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

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

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

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

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

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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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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];
}

603 604 605 606 607 608
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
631
};
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/**
634
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
635 636
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
638
 *	Examine the device configuration and tf->flags to calculate
639
 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
644
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;
649

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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
651 652
	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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654 655
	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)) {
658 659
		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
660
		index = dev->multi_count ? 0 : 8;
661 662
	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
664
	}
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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;
697
			block |= (u64)tf->hob_lbal << 24;
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
		} else
			block |= (tf->device & 0xf) << 24;

		block |= tf->lbah << 16;
		block |= tf->lbam << 8;
		block |= tf->lbal;
	} else {
		u32 cyl, head, sect;

		cyl = tf->lbam | (tf->lbah << 8);
		head = tf->device & 0xf;
		sect = tf->lbal;

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

	return block;
}

717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
/**
 *	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;

744
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
		/* 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;
}

840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
/**
 *	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.
 */
855 856 857
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
858 859 860 861 862 863
{
	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);
}

864 865 866 867 868 869 870 871 872 873
/**
 *	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.
 */
874 875
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
876 877 878 879 880 881 882 883 884
{
	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;
}

885
static const struct ata_xfer_ent {
886
	int shift, bits;
887 888
	u8 base;
} ata_xfer_tbl[] = {
889 890 891
	{ 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 },
892 893 894 895 896 897 898 899 900 901 902 903 904 905
	{ -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:
906
 *	Matching XFER_* value, 0xff if no match found.
907
 */
908
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
909 910 911 912 913 914 915
{
	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;
916
	return 0xff;
917 918 919 920 921 922 923 924 925 926 927 928 929 930
}

/**
 *	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.
 */
931
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
932 933 934 935 936
{
	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)
937 938
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953
	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.
 */
954
int ata_xfer_mode2shift(unsigned long xfer_mode)
955 956 957 958 959 960 961 962 963
{
	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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/**
965 966
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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967 968
 *
 *	Determine string which represents the highest speed
969
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
976
 *	@mode_mask, or the constant C string "<n/a>".
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 */
978
const char *ata_mode_string(unsigned long xfer_mask)
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{
980 981 982 983 984 985
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
986 987
		"PIO5",
		"PIO6",
988 989 990
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
991 992
		"MWDMA3",
		"MWDMA4",
993 994 995 996 997 998 999 1000 1001
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
1002
	int highbit;
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1004 1005 1006
	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>";
}

1010 1011 1012 1013 1014
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1015
		"6.0 Gbps",
1016 1017 1018 1019 1020 1021 1022
	};

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

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
{
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
	u32 scontrol;
	unsigned int err_mask;
	int rc;

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

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

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

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

1079 1080 1081 1082 1083
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
1084 1085 1086 1087 1088 1089 1090 1091 1092
		break;
	case NOT_AVAILABLE:
	case MAX_PERFORMANCE:
		/* disable all IPM transitions */
		scontrol |= (0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

1093 1094 1095 1096 1097
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
		break;
	}

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

	return 0;
}

/**
 *	ata_dev_enable_pm - enable SATA interface power management
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 *	@dev:  device to enable power management
 *	@policy: the link power management policy
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
 *
 *	Enable SATA Interface power management.  This will enable
 *	Device Interface Power Management (DIPM) for min_power
 * 	policy, and then call driver specific callbacks for
 *	enabling Host Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: -EINVAL if IPM is not supported, 0 otherwise.
 */
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
{
	int rc = 0;
	struct ata_port *ap = dev->link->ap;

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

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

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#ifdef CONFIG_PM
1141 1142
/**
 *	ata_dev_disable_pm - disable SATA interface power management
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 *	@dev: device to disable power management
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
 *
 *	Disable SATA Interface power management.  This will disable
 *	Device Interface Power Management (DIPM) without changing
 * 	policy,  call driver specific callbacks for disabling Host
 * 	Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: void
 */
static void ata_dev_disable_pm(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	ata_dev_set_dipm(dev, MAX_PERFORMANCE);
	if (ap->ops->disable_pm)
		ap->ops->disable_pm(ap);
}
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#endif	/* CONFIG_PM */
1162 1163 1164 1165

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1166
	ap->link.eh_info.action |= ATA_EH_LPM;
1167 1168 1169 1170
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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#ifdef CONFIG_PM
1172 1173 1174 1175 1176 1177 1178 1179 1180
static void ata_lpm_enable(struct ata_host *host)
{
	struct ata_link *link;
	struct ata_port *ap;
	struct ata_device *dev;
	int i;

	for (i = 0; i < host->n_ports; i++) {
		ap = host->ports[i];
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		ata_for_each_link(link, ap, EDGE) {
			ata_for_each_dev(dev, link, ALL)
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
				ata_dev_disable_pm(dev);
		}
	}
}

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

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		ata_lpm_schedule(ap, ap->pm_policy);
	}
}
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#endif	/* CONFIG_PM */
1198

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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:
1211 1212
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
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{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
L
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	 */
1234
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1239
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1244 1245 1246 1247 1248 1249
	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)) {
1250
		printk(KERN_INFO "ata: SEMB device ignored\n");
1251 1252 1253
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

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

/**
1259
 *	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.
 */

1273 1274
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
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{
	unsigned int c;

1278 1279
	BUG_ON(len & 1);

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

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

		ofs++;
		len -= 2;
	}
}

1294
/**
1295
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1296 1297 1298 1299 1300
 *	@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.
 *
1301
 *	This function is identical to ata_id_string except that it
1302 1303 1304 1305 1306 1307
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1308 1309
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1310 1311 1312
{
	unsigned char *p;

1313
	ata_id_string(id, s, ofs, len - 1);
1314 1315 1316 1317 1318 1319

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

1336
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
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{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1342
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
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	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1347
	return sectors;
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}

1350
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
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{
	u64 sectors = 0;

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

1359
	return sectors;
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}

/**
1363 1364 1365
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
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 *
1367 1368
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
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 *
1370 1371 1372
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
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 */
1374
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
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{
1376
	unsigned int err_mask;
A
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1377
	struct ata_taskfile tf;
1378
	int lba48 = ata_id_has_lba48(dev->id);
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	ata_tf_init(dev, &tf);

1382
	/* always clear all address registers */
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	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1385 1386 1387 1388 1389
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
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	tf.protocol |= ATA_PROT_NODATA;
1392 1393
	tf.device |= ATA_LBA;

1394
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1395 1396 1397 1398 1399 1400 1401
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
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1403
	if (lba48)
1404
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1405
	else
1406
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1407
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1408
		(*max_sectors)--;
1409
	return 0;
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1410 1411 1412
}

/**
1413 1414
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
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 *	@new_sectors: new max sectors value to set for the device
A
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 *
1417 1418 1419 1420 1421 1422
 *	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
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 */
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1424
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
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1425
{
1426
	unsigned int err_mask;
A
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1427
	struct ata_taskfile tf;
1428
	int lba48 = ata_id_has_lba48(dev->id);
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1429 1430 1431 1432 1433 1434

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1435 1436 1437 1438 1439 1440 1441 1442

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

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
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	} else {
1444 1445
		tf.command = ATA_CMD_SET_MAX;

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1446 1447 1448
		tf.device |= (new_sectors >> 24) & 0xf;
	}

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	tf.protocol |= ATA_PROT_NODATA;
1450
	tf.device |= ATA_LBA;
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1451 1452 1453 1454 1455

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

1456
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
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}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
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 *
 *	RETURNS:
 *	0 on success, -errno on failure.
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 */
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1480
static int ata_hpa_resize(struct ata_device *dev)
A
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{
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	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1486
	int rc;
J
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1487

T
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1488 1489 1490 1491
	/* 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))
1492
		return 0;
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T
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1494 1495 1496
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
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		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
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1499
		 */
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1500
		if (rc == -EACCES || !ata_ignore_hpa) {
T
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1501
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
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1502
				       "broken, skipping HPA handling\n");
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1503 1504 1505 1506 1507
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
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		}
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1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
		return rc;
	}

	/* nothing to do? */
	if (native_sectors <= sectors || !ata_ignore_hpa) {
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
			ata_dev_printk(dev, KERN_INFO,
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
			ata_dev_printk(dev, KERN_WARNING,
				"native sectors (%llu) is smaller than "
				"sectors (%llu)\n",
				(unsigned long long)native_sectors,
				(unsigned long long)sectors);
		return 0;
	}

	/* let's unlock HPA */
	rc = ata_set_max_sectors(dev, native_sectors);
	if (rc == -EACCES) {
		/* if device aborted the command, skip HPA resizing */
		ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
			       "(%llu -> %llu), skipping HPA handling\n",
			       (unsigned long long)sectors,
			       (unsigned long long)native_sectors);
		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
		return 0;
	} else if (rc)
		return rc;

	/* re-read IDENTIFY data */
	rc = ata_dev_reread_id(dev, 0);
	if (rc) {
		ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
			       "data after HPA resizing\n");
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
		ata_dev_printk(dev, KERN_INFO,
			"HPA unlocked: %llu -> %llu, native %llu\n",
			(unsigned long long)sectors,
			(unsigned long long)new_sectors,
			(unsigned long long)native_sectors);
	}

	return 0;
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1563 1564
}

L
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1565 1566
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1567
 *	@id: IDENTIFY DEVICE page to dump
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1568
 *
1569 1570
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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1571 1572 1573 1574 1575
 *
 *	LOCKING:
 *	caller.
 */

1576
static inline void ata_dump_id(const u16 *id)
L
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1577 1578 1579 1580 1581 1582
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1583 1584 1585 1586 1587
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
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1588 1589 1590 1591 1592
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1593 1594 1595 1596 1597
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
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1598 1599
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1600 1601
		id[88],
		id[93]);
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1602 1603
}

1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
/**
 *	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
 */
1619
unsigned long ata_id_xfermask(const u16 *id)
1620
{
1621
	unsigned long pio_mask, mwdma_mask, udma_mask;
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632

	/* 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.
		 */
1633
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1634
		if (mode < 5)	/* Valid PIO range */
1635
			pio_mask = (2 << mode) - 1;
1636 1637
		else
			pio_mask = 1;
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647

		/* 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;
1648

1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
		int pio = id[163] & 0x7;
		int dma = (id[163] >> 3) & 7;

		if (pio)
			pio_mask |= (1 << 5);
		if (pio > 1)
			pio_mask |= (1 << 6);
		if (dma)
			mwdma_mask |= (1 << 3);
		if (dma > 1)
			mwdma_mask |= (1 << 4);
	}

1666 1667 1668
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1669 1670 1671 1672

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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1673
/**
1674
 *	ata_pio_queue_task - Queue port_task
T
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1675
 *	@ap: The ata_port to queue port_task for
1676
 *	@data: data for @fn to use
1677
 *	@delay: delay time in msecs for workqueue function
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1678 1679 1680 1681 1682 1683 1684
 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
1685
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
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1686 1687 1688 1689 1690
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
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1691
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1692
{
1693
	ap->port_task_data = data;
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1694

1695
	/* may fail if ata_port_flush_task() in progress */
1696
	queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
T
Tejun Heo 已提交
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
}

/**
 *	ata_port_flush_task - Flush port_task
 *	@ap: The ata_port to flush port_task for
 *
 *	After this function completes, port_task is guranteed not to
 *	be running or scheduled.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
void ata_port_flush_task(struct ata_port *ap)
{
	DPRINTK("ENTER\n");

1713
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1714

1715
	if (ata_msg_ctl(ap))
1716
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
T
Tejun Heo 已提交
1717 1718
}

1719
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1720
{
1721
	struct completion *waiting = qc->private_data;
1722 1723 1724 1725 1726

	complete(waiting);
}

/**
1727
 *	ata_exec_internal_sg - execute libata internal command
1728 1729
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1730
 *	@cdb: CDB for packet command
1731
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1732
 *	@sgl: sg list for the data buffer of the command
1733
 *	@n_elem: Number of sg entries
1734
 *	@timeout: Timeout in msecs (0 for default)
1735 1736 1737 1738 1739 1740 1741 1742 1743
 *
 *	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.
1744 1745 1746
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1747
 */
1748 1749
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1750
			      int dma_dir, struct scatterlist *sgl,
1751
			      unsigned int n_elem, unsigned long timeout)
1752
{
T
Tejun Heo 已提交
1753 1754
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1755
	u8 command = tf->command;
1756
	int auto_timeout = 0;
1757
	struct ata_queued_cmd *qc;
1758
	unsigned int tag, preempted_tag;
1759
	u32 preempted_sactive, preempted_qc_active;
1760
	int preempted_nr_active_links;
1761
	DECLARE_COMPLETION_ONSTACK(wait);
1762
	unsigned long flags;
1763
	unsigned int err_mask;
1764
	int rc;
1765

1766
	spin_lock_irqsave(ap->lock, flags);
1767

1768
	/* no internal command while frozen */
1769
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1770
		spin_unlock_irqrestore(ap->lock, flags);
1771 1772 1773
		return AC_ERR_SYSTEM;
	}

1774
	/* initialize internal qc */
1775

1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
	/* 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;

1786 1787
	if (test_and_set_bit(tag, &ap->qc_allocated))
		BUG();
1788
	qc = __ata_qc_from_tag(ap, tag);
1789 1790 1791 1792 1793 1794 1795

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

T
Tejun Heo 已提交
1796 1797
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1798
	preempted_qc_active = ap->qc_active;
1799
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1800 1801
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1802
	ap->qc_active = 0;
1803
	ap->nr_active_links = 0;
1804 1805

	/* prepare & issue qc */
1806
	qc->tf = *tf;
1807 1808
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1809
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1810 1811
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1812
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1813
		struct scatterlist *sg;
1814

J
Jens Axboe 已提交
1815 1816
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1817

J
Jens Axboe 已提交
1818
		ata_sg_init(qc, sgl, n_elem);
1819
		qc->nbytes = buflen;
1820 1821
	}

1822
	qc->private_data = &wait;
1823 1824
	qc->complete_fn = ata_qc_complete_internal;

1825
	ata_qc_issue(qc);
1826

1827
	spin_unlock_irqrestore(ap->lock, flags);
1828

1829 1830 1831 1832 1833 1834 1835 1836
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1837 1838

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1839 1840

	ata_port_flush_task(ap);
1841

1842
	if (!rc) {
1843
		spin_lock_irqsave(ap->lock, flags);
1844 1845 1846

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1847 1848
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1849
		 */
1850
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1851 1852 1853 1854 1855 1856
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1857

1858 1859
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1860
					"qc timeout (cmd 0x%x)\n", command);
1861 1862
		}

1863
		spin_unlock_irqrestore(ap->lock, flags);
1864 1865
	}

1866 1867 1868 1869
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
	/* 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;
1880 1881
	}

1882
	/* finish up */
1883
	spin_lock_irqsave(ap->lock, flags);
1884

1885
	*tf = qc->result_tf;
1886 1887 1888
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1889 1890
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1891
	ap->qc_active = preempted_qc_active;
1892
	ap->nr_active_links = preempted_nr_active_links;
1893

1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1905
	if (ap->flags & ATA_FLAG_DISABLED) {
1906 1907 1908 1909
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1910
	spin_unlock_irqrestore(ap->lock, flags);
1911

1912 1913 1914
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1915
	return err_mask;
1916 1917
}

1918
/**
1919
 *	ata_exec_internal - execute libata internal command
1920 1921 1922 1923 1924 1925
 *	@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
1926
 *	@timeout: Timeout in msecs (0 for default)
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938
 *
 *	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,
1939 1940
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1941
{
1942 1943
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1944

1945 1946 1947 1948 1949 1950
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1951

1952 1953
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1954 1955
}

1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968
/**
 *	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
1969
 */
1970
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1971 1972 1973 1974 1975 1976 1977 1978 1979
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1980
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1981 1982
}

1983 1984 1985 1986 1987 1988 1989
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
J
Jeff Garzik 已提交
1990

1991 1992
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1993 1994
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1995
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1996
		return 0;
1997 1998 1999 2000
	/* 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
2001 2002 2003 2004 2005
	/* 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))
2006
		return 1;
A
Alan Cox 已提交
2007 2008
	return 0;
}
2009

A
Alan Cox 已提交
2010 2011 2012 2013 2014 2015 2016
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
J
Jeff Garzik 已提交
2017

A
Alan Cox 已提交
2018 2019
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
2020 2021
	/* 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
2022
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
2023 2024 2025 2026
		/* 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
2027 2028
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
2029 2030
		}
	}
A
Alan Cox 已提交
2031
	return 3 << ATA_SHIFT_PIO;
2032 2033
}

2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050
/**
 *	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
2051
/**
2052 2053 2054
 *	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)
2055
 *	@flags: ATA_READID_* flags
2056
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
2057
 *
2058 2059
 *	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
2060 2061
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
2062
 *
2063
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2064
 *	now we abort if we hit that case.
2065
 *
L
Linus Torvalds 已提交
2066
 *	LOCKING:
2067 2068 2069 2070
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2071
 */
2072
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2073
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
2074
{
T
Tejun Heo 已提交
2075
	struct ata_port *ap = dev->link->ap;
2076
	unsigned int class = *p_class;
2077
	struct ata_taskfile tf;
2078 2079
	unsigned int err_mask = 0;
	const char *reason;
2080
	int may_fallback = 1, tried_spinup = 0;
2081
	int rc;
L
Linus Torvalds 已提交
2082

2083
	if (ata_msg_ctl(ap))
2084
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2085

2086
retry:
T
Tejun Heo 已提交
2087
	ata_tf_init(dev, &tf);
2088

2089 2090
	switch (class) {
	case ATA_DEV_ATA:
2091
		tf.command = ATA_CMD_ID_ATA;
2092 2093
		break;
	case ATA_DEV_ATAPI:
2094
		tf.command = ATA_CMD_ID_ATAPI;
2095 2096 2097 2098 2099
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
2100 2101
	}

2102
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
2103 2104 2105 2106 2107 2108 2109 2110 2111 2112

	/* 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
2113

2114 2115 2116 2117 2118
	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);

2119
	if (err_mask) {
2120
		if (err_mask & AC_ERR_NODEV_HINT) {
2121 2122
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
2123 2124 2125
			return -ENOENT;
		}

2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148
		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;
2149 2150
		}

2151 2152
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
2153 2154 2155
		goto err_out;
	}

2156 2157 2158 2159 2160
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

2161
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
2162

2163
	/* sanity check */
2164
	rc = -EINVAL;
A
Alan Cox 已提交
2165
	reason = "device reports invalid type";
2166 2167 2168 2169 2170 2171 2172

	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;
2173 2174
	}

2175 2176 2177 2178 2179 2180 2181
	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.
		 */
2182
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2183
		if (err_mask && id[2] != 0x738c) {
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
			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;
	}

2196
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2197 2198 2199
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2200 2201
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2202 2203
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2204 2205 2206
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2207 2208
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2209
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2210 2211 2212 2213 2214 2215 2216 2217 2218
			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.
			 */
2219
			flags &= ~ATA_READID_POSTRESET;
2220 2221 2222 2223 2224
			goto retry;
		}
	}

	*p_class = class;
2225

2226 2227 2228
	return 0;

 err_out:
T
Tejun Heo 已提交
2229
	if (ata_msg_warn(ap))
2230
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2231
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2232 2233 2234
	return rc;
}

T
Tejun Heo 已提交
2235
static inline u8 ata_dev_knobble(struct ata_device *dev)
2236
{
T
Tejun Heo 已提交
2237
	struct ata_port *ap = dev->link->ap;
2238 2239 2240 2241

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

T
Tejun Heo 已提交
2242
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2243 2244
}

2245 2246 2247
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2248
	struct ata_port *ap = dev->link->ap;
2249 2250 2251 2252 2253 2254
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
T
Tejun Heo 已提交
2255
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2256 2257 2258
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2259
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2260
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2261 2262 2263 2264 2265 2266 2267 2268 2269
		dev->flags |= ATA_DFLAG_NCQ;
	}

	if (hdepth >= ddepth)
		snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
	else
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
}

2270
/**
2271 2272 2273 2274 2275
 *	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.
2276 2277
 *
 *	LOCKING:
2278 2279 2280 2281
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2282
 */
2283
int ata_dev_configure(struct ata_device *dev)
2284
{
T
Tejun Heo 已提交
2285 2286
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2287
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2288
	const u16 *id = dev->id;
2289
	unsigned long xfer_mask;
2290
	char revbuf[7];		/* XYZ-99\0 */
2291 2292
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2293
	int rc;
2294

2295
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2296
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2297
			       __func__);
2298
		return 0;
2299 2300
	}

2301
	if (ata_msg_probe(ap))
2302
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2303

T
Tejun Heo 已提交
2304 2305
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2306
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2307

2308 2309 2310 2311 2312 2313 2314
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2315 2316 2317 2318 2319 2320 2321 2322 2323 2324
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_WARNING,
			"WARNING: ATAPI is %s, device ignored.\n",
			atapi_enabled ? "not supported with this driver"
				      : "disabled");
		ata_dev_disable(dev);
		return 0;
	}

T
Tejun Heo 已提交
2325 2326 2327 2328
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2329

T
Tejun Heo 已提交
2330 2331 2332 2333 2334
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2335
	/* print device capabilities */
2336
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2337 2338 2339
		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",
2340
			       __func__,
2341 2342
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2343

2344
	/* initialize to-be-configured parameters */
2345
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2346 2347 2348 2349 2350 2351 2352
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
2353 2354 2355 2356
	/*
	 * common ATA, ATAPI feature tests
	 */

2357
	/* find max transfer mode; for printk only */
2358
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2359

2360 2361
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2362

2363 2364 2365 2366 2367 2368 2369
	/* 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
2370 2371
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2372 2373
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
2374 2375 2376
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2377
			snprintf(revbuf, 7, "CFA");
2378
		} else {
2379
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2380 2381 2382 2383 2384 2385
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
		}
2386

2387
		dev->n_sectors = ata_id_n_sectors(id);
2388

2389 2390 2391
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

2392
		if (ata_id_has_lba(id)) {
2393
			const char *lba_desc;
2394
			char ncq_desc[20];
2395

2396 2397
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2398
			if (ata_id_has_lba48(id)) {
2399
				dev->flags |= ATA_DFLAG_LBA48;
2400
				lba_desc = "LBA48";
2401 2402 2403 2404

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2405
			}
2406

2407 2408 2409
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2410
			/* print device info to dmesg */
2411 2412 2413 2414 2415 2416 2417
			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",
2418
					(unsigned long long)dev->n_sectors,
2419 2420
					dev->multi_count, lba_desc, ncq_desc);
			}
2421
		} else {
2422 2423 2424
			/* CHS */

			/* Default translation */
2425 2426 2427
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2428

2429
			if (ata_id_current_chs_valid(id)) {
2430
				/* Current CHS translation is valid. */
2431 2432 2433
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2434 2435 2436
			}

			/* print device info to dmesg */
2437
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2438
				ata_dev_printk(dev, KERN_INFO,
2439 2440 2441
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2442
				ata_dev_printk(dev, KERN_INFO,
2443 2444 2445 2446 2447
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2448 2449
		}

2450
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2451 2452 2453
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2454
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2455 2456
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2457
		const char *dma_dir_string = "";
2458
		u32 sntf;
2459

2460
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2461
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2462
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2463 2464
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2465
			rc = -EINVAL;
L
Linus Torvalds 已提交
2466 2467
			goto err_out_nosup;
		}
2468
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2469

2470 2471 2472 2473
		/* 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.
2474
		 */
2475
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2476
		    (!sata_pmp_attached(ap) ||
2477
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2478 2479
			unsigned int err_mask;

2480
			/* issue SET feature command to turn this on */
2481 2482
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2483
			if (err_mask)
2484
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2485 2486 2487
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2488
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2489 2490
				atapi_an_string = ", ATAPI AN";
			}
2491 2492
		}

2493
		if (ata_id_cdb_intr(dev->id)) {
2494
			dev->flags |= ATA_DFLAG_CDB_INTR;
2495 2496
			cdb_intr_string = ", CDB intr";
		}
2497

2498 2499 2500 2501 2502
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2503
		/* print device info to dmesg */
2504
		if (ata_msg_drv(ap) && print_info)
2505
			ata_dev_printk(dev, KERN_INFO,
2506
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2507
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2508
				       ata_mode_string(xfer_mask),
2509 2510
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2511 2512
	}

2513 2514 2515 2516 2517
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2518 2519 2520 2521 2522 2523 2524
	if (!(dev->horkage & ATA_HORKAGE_IPM)) {
		if (ata_id_has_hipm(dev->id))
			dev->flags |= ATA_DFLAG_HIPM;
		if (ata_id_has_dipm(dev->id))
			dev->flags |= ATA_DFLAG_DIPM;
	}

2525 2526
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2527
	if (ata_dev_knobble(dev)) {
2528
		if (ata_msg_drv(ap) && print_info)
2529 2530
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2531
		dev->udma_mask &= ATA_UDMA5;
2532 2533 2534
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2535
	if ((dev->class == ATA_DEV_ATAPI) &&
2536
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2537
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2538 2539
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2540

T
Tejun Heo 已提交
2541
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2542 2543
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2544

2545 2546 2547 2548 2549 2550 2551
	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
		dev->horkage |= ATA_HORKAGE_IPM;

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

2552
	if (ap->ops->dev_config)
2553
		ap->ops->dev_config(dev);
2554

2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
	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");
		}
	}

2570 2571 2572 2573 2574 2575 2576
	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");
	}

2577
	return 0;
L
Linus Torvalds 已提交
2578 2579

err_out_nosup:
2580
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2581
		ata_dev_printk(dev, KERN_DEBUG,
2582
			       "%s: EXIT, err\n", __func__);
2583
	return rc;
L
Linus Torvalds 已提交
2584 2585
}

A
Alan Cox 已提交
2586
/**
2587
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2588 2589
 *	@ap: port
 *
2590
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2591 2592 2593 2594 2595 2596 2597 2598 2599
 *	detection.
 */

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

/**
2600
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2601 2602
 *	@ap: port
 *
2603
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
 *	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
2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635
/**
 *	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
2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647
/**
 *	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
2648 2649 2650 2651
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2652 2653 2654 2655
 *	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
2656
 *	LOCKING:
J
Jeff Garzik 已提交
2657
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2658 2659
 *
 *	RETURNS:
2660
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2661 2662
 */

2663
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2664
{
2665
	unsigned int classes[ATA_MAX_DEVICES];
2666
	int tries[ATA_MAX_DEVICES];
2667
	int rc;
2668
	struct ata_device *dev;
L
Linus Torvalds 已提交
2669

2670
	ata_port_probe(ap);
2671

T
Tejun Heo 已提交
2672
	ata_for_each_dev(dev, &ap->link, ALL)
2673
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2674 2675

 retry:
T
Tejun Heo 已提交
2676
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694
		/* 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);
	}

2695
	/* reset and determine device classes */
2696
	ap->ops->phy_reset(ap);
2697

T
Tejun Heo 已提交
2698
	ata_for_each_dev(dev, &ap->link, ALL) {
2699 2700 2701 2702 2703
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2704

2705
		dev->class = ATA_DEV_UNKNOWN;
2706
	}
L
Linus Torvalds 已提交
2707

2708
	ata_port_probe(ap);
2709

2710 2711 2712 2713
	/* 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
2714
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2715 2716
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2717

2718
		if (!ata_dev_enabled(dev))
2719 2720
			continue;

2721 2722
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2723 2724
		if (rc)
			goto fail;
2725 2726
	}

A
Alan Cox 已提交
2727 2728 2729 2730
	/* 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
2731 2732 2733 2734 2735 2736
	/* 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
2737 2738 2739
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2740 2741 2742
	/* 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
2743
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2744
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2745
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2746
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2747 2748
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2749 2750
	}

2751
	/* configure transfer mode */
2752
	rc = ata_set_mode(&ap->link, &dev);
2753
	if (rc)
2754
		goto fail;
L
Linus Torvalds 已提交
2755

T
Tejun Heo 已提交
2756 2757
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2758

2759 2760
	/* no device present, disable port */
	ata_port_disable(ap);
2761
	return -ENODEV;
2762 2763

 fail:
2764 2765
	tries[dev->devno]--;

2766 2767
	switch (rc) {
	case -EINVAL:
2768
		/* eeek, something went very wrong, give up */
2769 2770
		tries[dev->devno] = 0;
		break;
2771 2772 2773 2774

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2775
	case -EIO:
2776 2777 2778 2779
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2780
			sata_down_spd_limit(&ap->link, 0);
2781 2782
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2783 2784
	}

2785
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2786
		ata_dev_disable(dev);
2787

2788
	goto retry;
L
Linus Torvalds 已提交
2789 2790 2791
}

/**
J
Jeff Garzik 已提交
2792 2793
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2794
 *
J
Jeff Garzik 已提交
2795 2796 2797
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2798
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2799
 *	serialization.
L
Linus Torvalds 已提交
2800 2801 2802 2803
 */

void ata_port_probe(struct ata_port *ap)
{
2804
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2805 2806
}

2807 2808
/**
 *	sata_print_link_status - Print SATA link status
2809
 *	@link: SATA link to printk link status about
2810 2811 2812 2813 2814 2815
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2816
static void sata_print_link_status(struct ata_link *link)
2817
{
2818
	u32 sstatus, scontrol, tmp;
2819

2820
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2821
		return;
2822
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2823

T
Tejun Heo 已提交
2824
	if (ata_phys_link_online(link)) {
2825
		tmp = (sstatus >> 4) & 0xf;
2826
		ata_link_printk(link, KERN_INFO,
2827 2828
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2829
	} else {
2830
		ata_link_printk(link, KERN_INFO,
2831 2832
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2833 2834 2835
	}
}

2836 2837 2838 2839 2840 2841 2842
/**
 *	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
 */
2843

T
Tejun Heo 已提交
2844
struct ata_device *ata_dev_pair(struct ata_device *adev)
2845
{
T
Tejun Heo 已提交
2846 2847
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2848
	if (!ata_dev_enabled(pair))
2849 2850 2851 2852
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2853
/**
J
Jeff Garzik 已提交
2854 2855
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2856
 *
J
Jeff Garzik 已提交
2857 2858 2859 2860 2861
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is disabled, and should
 *	never attempt to probe or communicate with devices
 *	on this port.
 *
J
Jeff Garzik 已提交
2862
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2863
 *	serialization.
L
Linus Torvalds 已提交
2864 2865 2866 2867
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2868 2869
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2870
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2871 2872
}

2873
/**
2874
 *	sata_down_spd_limit - adjust SATA spd limit downward
2875
 *	@link: Link to adjust SATA spd limit for
2876
 *	@spd_limit: Additional limit
2877
 *
2878
 *	Adjust SATA spd limit of @link downward.  Note that this
2879
 *	function only adjusts the limit.  The change must be applied
2880
 *	using sata_set_spd().
2881
 *
2882 2883 2884 2885 2886
 *	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.
 *
2887 2888 2889 2890 2891 2892
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2893
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2894
{
2895
	u32 sstatus, spd, mask;
2896
	int rc, bit;
2897

2898
	if (!sata_scr_valid(link))
2899 2900 2901
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2902
	 * If not, use cached value in link->sata_spd.
2903
	 */
2904
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2905
	if (rc == 0 && ata_sstatus_online(sstatus))
2906 2907
		spd = (sstatus >> 4) & 0xf;
	else
2908
		spd = link->sata_spd;
2909

2910
	mask = link->sata_spd_limit;
2911 2912
	if (mask <= 1)
		return -EINVAL;
2913 2914

	/* unconditionally mask off the highest bit */
2915 2916
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2917

2918 2919 2920 2921 2922 2923 2924 2925 2926
	/* 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? */
2927 2928 2929
	if (!mask)
		return -EINVAL;

2930 2931 2932 2933 2934 2935 2936 2937 2938
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

2939
	link->sata_spd_limit = mask;
2940

2941
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2942
			sata_spd_string(fls(mask)));
2943 2944 2945 2946

	return 0;
}

2947
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2948
{
2949 2950
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2951

2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962
	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;
2963
	else
2964
		target = fls(limit);
2965 2966

	spd = (*scontrol >> 4) & 0xf;
2967
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2968

2969
	return spd != target;
2970 2971 2972
}

/**
2973
 *	sata_set_spd_needed - is SATA spd configuration needed
2974
 *	@link: Link in question
2975 2976
 *
 *	Test whether the spd limit in SControl matches
2977
 *	@link->sata_spd_limit.  This function is used to determine
2978 2979 2980 2981 2982 2983 2984 2985 2986
 *	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
2987
static int sata_set_spd_needed(struct ata_link *link)
2988 2989 2990
{
	u32 scontrol;

2991
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2992
		return 1;
2993

2994
	return __sata_set_spd_needed(link, &scontrol);
2995 2996 2997
}

/**
2998
 *	sata_set_spd - set SATA spd according to spd limit
2999
 *	@link: Link to set SATA spd for
3000
 *
3001
 *	Set SATA spd of @link according to sata_spd_limit.
3002 3003 3004 3005 3006 3007
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
3008
 *	changed.  Negative errno if SCR registers are inaccessible.
3009
 */
3010
int sata_set_spd(struct ata_link *link)
3011 3012
{
	u32 scontrol;
3013
	int rc;
3014

3015
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3016
		return rc;
3017

3018
	if (!__sata_set_spd_needed(link, &scontrol))
3019 3020
		return 0;

3021
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3022 3023
		return rc;

3024 3025 3026
	return 1;
}

A
Alan Cox 已提交
3027 3028 3029 3030 3031
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
3032
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
3033
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3034 3035 3036
 * 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
3037 3038 3039
 */

static const struct ata_timing ata_timing[] = {
3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066
/*	{ 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
3067 3068 3069 3070

	{ 0xFF }
};

3071 3072
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
3073 3074 3075

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
3076 3077 3078 3079 3080 3081 3082 3083 3084
	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
3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095
}

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);
3096
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
3097 3098 3099 3100
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

3101
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
3102
{
3103 3104 3105 3106
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
3107

3108 3109 3110
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
3111 3112 3113 3114 3115 3116 3117 3118 3119
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
	const struct ata_timing *s;
	struct ata_timing p;

	/*
3120
	 * Find the mode.
3121
	 */
A
Alan Cox 已提交
3122 3123 3124 3125

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

3126 3127
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
3128 3129 3130 3131 3132 3133 3134
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
		memset(&p, 0, sizeof(p));
3135
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
3136 3137
			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
3138
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
3139 3140 3141 3142 3143 3144 3145 3146 3147
			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
		}
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

3148
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3149 3150

	/*
3151 3152 3153
	 * 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
3154 3155
	 */

3156
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3157 3158 3159 3160 3161
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3162
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173
	 */

	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
3174

3175 3176 3177 3178 3179
	/* 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
3180 3181 3182 3183

	return 0;
}

3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234
/**
 *	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;
}

3235 3236 3237
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3238
 *	@sel: ATA_DNXFER_* selector
3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249
 *
 *	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
 */
3250
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3251
{
3252
	char buf[32];
3253 3254
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3255
	int quiet, highbit;
3256

3257 3258
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3259

3260 3261 3262 3263
	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);
3264

3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316
	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);
	}
3317 3318 3319 3320 3321 3322 3323

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

	return 0;
}

T
Tejun Heo 已提交
3324
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3325
{
T
Tejun Heo 已提交
3326
	struct ata_eh_context *ehc = &dev->link->eh_context;
3327 3328
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3329 3330
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
3331

3332
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3333 3334 3335
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
3336
	err_mask = ata_dev_set_xfermode(dev);
3337

3338 3339 3340 3341 3342 3343 3344 3345 3346 3347
	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;

3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362
	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;
	}
3363 3364
	/* 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 */
3365
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3366 3367
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3368
		ign_dev_err = 1;
3369

3370 3371 3372
	/* 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
3373

3374 3375 3376 3377 3378 3379
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3380

3381 3382
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3383

3384 3385 3386 3387
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3388
	return 0;
3389 3390 3391 3392 3393

 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
3394 3395 3396
}

/**
3397
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3398
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3399
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3400
 *
3401 3402 3403
 *	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
3404
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3405
 *
L
Linus Torvalds 已提交
3406
 *	LOCKING:
J
Jeff Garzik 已提交
3407
 *	PCI/etc. bus probe sem.
3408 3409 3410
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3411
 */
3412

3413
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3414
{
3415
	struct ata_port *ap = link->ap;
3416
	struct ata_device *dev;
3417
	int rc = 0, used_dma = 0, found = 0;
3418

3419
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3420
	ata_for_each_dev(dev, link, ENABLED) {
3421
		unsigned long pio_mask, dma_mask;
3422
		unsigned int mode_mask;
3423

3424 3425 3426 3427 3428 3429
		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
3430
		ata_dev_xfermask(dev);
3431
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3432

3433 3434
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3435 3436 3437 3438 3439 3440

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

3441 3442
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3443

3444
		found = 1;
3445
		if (ata_dma_enabled(dev))
3446
			used_dma = 1;
3447
	}
3448
	if (!found)
3449
		goto out;
3450 3451

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3452
	ata_for_each_dev(dev, link, ENABLED) {
3453
		if (dev->pio_mode == 0xff) {
3454
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3455
			rc = -EINVAL;
3456
			goto out;
3457 3458 3459 3460 3461 3462 3463
		}

		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
3464

3465
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3466 3467
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3468 3469 3470 3471 3472 3473 3474
			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
3475 3476

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3477
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3478
		rc = ata_dev_set_mode(dev);
3479
		if (rc)
3480
			goto out;
3481
	}
L
Linus Torvalds 已提交
3482

3483 3484
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3485
	 */
J
Jeff Garzik 已提交
3486
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3487
		ap->host->simplex_claimed = ap;
3488

3489 3490 3491 3492
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3493 3494
}

3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518
/**
 *	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;
3519
	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3520 3521
	int warned = 0;

T
Tejun Heo 已提交
3522 3523 3524 3525 3526 3527
	/* 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);

3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589
	if (time_after(nodev_deadline, deadline))
		nodev_deadline = deadline;

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

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

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

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

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

		msleep(50);
	}
}

/**
 *	ata_wait_after_reset - wait for link to become ready after reset
 *	@link: link to be waited on
 *	@deadline: deadline jiffies for the operation
 *	@check_ready: callback to check link readiness
 *
 *	Wait for @link to become ready after reset.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 if @linke is ready before @deadline; otherwise, -errno.
 */
3590
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3591 3592
				int (*check_ready)(struct ata_link *link))
{
3593
	msleep(ATA_WAIT_AFTER_RESET);
3594 3595 3596 3597

	return ata_wait_ready(link, deadline, check_ready);
}

3598
/**
3599 3600
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3601
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3602
 *	@deadline: deadline jiffies for the operation
3603
 *
3604
*	Make sure SStatus of @link reaches stable state, determined by
3605 3606
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3607 3608
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3609 3610
 *	until timeout then returns 0 if DET is stable at 1.
 *
3611 3612 3613
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3614 3615 3616 3617 3618 3619
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3620 3621
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3622
{
3623 3624
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3625
	unsigned long last_jiffies, t;
3626 3627 3628
	u32 last, cur;
	int rc;

3629
	t = ata_deadline(jiffies, params[2]);
3630 3631 3632
	if (time_before(t, deadline))
		deadline = t;

3633
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3634 3635 3636 3637 3638 3639 3640
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3641
		msleep(interval);
3642
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3643 3644 3645 3646 3647
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3648
			if (cur == 1 && time_before(jiffies, deadline))
3649
				continue;
3650 3651
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3652 3653 3654 3655 3656 3657 3658 3659
				return 0;
			continue;
		}

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

3660 3661 3662
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3663
		if (time_after(jiffies, deadline))
3664
			return -EPIPE;
3665 3666 3667 3668
	}
}

/**
3669 3670
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3671
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3672
 *	@deadline: deadline jiffies for the operation
3673
 *
3674
 *	Resume SATA phy @link and debounce it.
3675 3676 3677 3678 3679 3680 3681
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3682 3683
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3684
{
3685
	u32 scontrol, serror;
3686 3687
	int rc;

3688
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3689
		return rc;
3690

3691
	scontrol = (scontrol & 0x0f0) | 0x300;
3692

3693
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3694
		return rc;
3695

3696 3697 3698 3699
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3700

3701 3702 3703
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3704
	/* clear SError, some PHYs require this even for SRST to work */
3705 3706 3707
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3708
	return rc != -EINVAL ? rc : 0;
3709 3710
}

3711
/**
3712
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3713
 *	@link: ATA link to be reset
3714
 *	@deadline: deadline jiffies for the operation
3715
 *
T
Tejun Heo 已提交
3716
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3717 3718 3719 3720
 *	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.
3721 3722 3723 3724 3725 3726 3727
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3728
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3729
{
T
Tejun Heo 已提交
3730
	struct ata_port *ap = link->ap;
3731
	struct ata_eh_context *ehc = &link->eh_context;
3732
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3733 3734 3735 3736 3737 3738
	int rc;

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

3739
	/* if SATA, resume link */
3740
	if (ap->flags & ATA_FLAG_SATA) {
3741
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3742 3743
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3744
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3745 3746 3747
					"link for reset (errno=%d)\n", rc);
	}

3748
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3749
	if (ata_phys_link_offline(link))
3750 3751
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3752 3753 3754
	return 0;
}

3755
/**
T
Tejun Heo 已提交
3756 3757 3758
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3759
 *	@deadline: deadline jiffies for the operation
3760 3761
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3762
 *
T
Tejun Heo 已提交
3763
 *	SATA phy-reset @link using DET bits of SControl register.
3764 3765 3766 3767 3768 3769 3770 3771
 *	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.
3772 3773 3774 3775 3776 3777 3778
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3779
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3780 3781
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3782
{
T
Tejun Heo 已提交
3783
	u32 scontrol;
3784
	int rc;
3785

3786 3787
	DPRINTK("ENTER\n");

3788 3789 3790
	if (online)
		*online = false;

3791
	if (sata_set_spd_needed(link)) {
3792 3793 3794 3795 3796
		/* 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.
		 */
3797
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3798
			goto out;
3799

3800
		scontrol = (scontrol & 0x0f0) | 0x304;
3801

3802
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3803
			goto out;
3804

3805
		sata_set_spd(link);
3806 3807 3808
	}

	/* issue phy wake/reset */
3809
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3810
		goto out;
3811

3812
	scontrol = (scontrol & 0x0f0) | 0x301;
3813

3814
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3815
		goto out;
3816

3817
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3818 3819 3820 3821
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3822 3823
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3824 3825 3826
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3827
	if (ata_phys_link_offline(link))
3828 3829 3830 3831 3832 3833
		goto out;

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

T
Tejun Heo 已提交
3834
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3835 3836 3837 3838 3839 3840 3841 3842
		/* 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;

3843 3844
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855
			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);
3856
 out:
3857 3858 3859 3860
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3861 3862
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3863
	}
3864 3865 3866 3867
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893
/**
 *	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;
}

3894
/**
3895
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3896
 *	@link: the target ata_link
3897 3898 3899 3900 3901 3902 3903 3904 3905
 *	@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)
 */
3906
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3907
{
3908 3909
	u32 serror;

3910 3911
	DPRINTK("ENTER\n");

3912 3913 3914 3915
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3916
	/* print link status */
3917
	sata_print_link_status(link);
3918 3919 3920 3921

	DPRINTK("EXIT\n");
}

3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937
/**
 *	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
3938 3939
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3940 3941
{
	const u16 *old_id = dev->id;
3942 3943
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3944 3945

	if (dev->class != new_class) {
3946 3947
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3948 3949 3950
		return 0;
	}

3951 3952 3953 3954
	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]));
3955 3956

	if (strcmp(model[0], model[1])) {
3957 3958
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3959 3960 3961 3962
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3963 3964
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3965 3966 3967 3968 3969 3970 3971
		return 0;
	}

	return 1;
}

/**
3972
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3973
 *	@dev: target ATA device
3974
 *	@readid_flags: read ID flags
3975 3976 3977 3978 3979 3980 3981 3982 3983 3984
 *
 *	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
 */
3985
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3986
{
3987
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3988
	u16 *id = (void *)dev->link->ap->sector_buf;
3989 3990
	int rc;

3991
	/* read ID data */
3992
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3993
	if (rc)
3994
		return rc;
3995 3996

	/* is the device still there? */
3997 3998
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3999

4000
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4001 4002 4003 4004 4005 4006
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4007
 *	@new_class: new class code
4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018
 *	@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
 */
4019 4020
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4021
{
4022
	u64 n_sectors = dev->n_sectors;
4023 4024 4025 4026 4027
	int rc;

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

4028 4029 4030 4031 4032 4033 4034 4035 4036
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
	    new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

4037 4038 4039 4040
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4041 4042

	/* configure device according to the new ID */
4043
	rc = ata_dev_configure(dev);
4044 4045 4046 4047
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4048 4049
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
4050 4051 4052 4053
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
4054 4055 4056 4057

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

4058 4059 4060 4061 4062
		rc = -ENODEV;
		goto fail;
	}

	return 0;
4063 4064

 fail:
4065
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4066 4067 4068
	return rc;
}

4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
4105
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4106
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4107
	/* Odd clown on sil3726/4726 PMPs */
4108
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4109

4110
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4111
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4112
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4113

4114 4115 4116 4117
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4118
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4119
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4120 4121
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4122
	/* NCQ is broken */
4123
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4124
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4125
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4126
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4127
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4128

4129
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4130
	{ "ST31500341AS",	"SD15",		ATA_HORKAGE_NONCQ |
4131
						ATA_HORKAGE_FIRMWARE_WARN },
4132
	{ "ST31500341AS",	"SD16",		ATA_HORKAGE_NONCQ |
4133
						ATA_HORKAGE_FIRMWARE_WARN },
4134
	{ "ST31500341AS",	"SD17",		ATA_HORKAGE_NONCQ |
4135
						ATA_HORKAGE_FIRMWARE_WARN },
4136
	{ "ST31500341AS",	"SD18",		ATA_HORKAGE_NONCQ |
4137
						ATA_HORKAGE_FIRMWARE_WARN },
4138
	{ "ST31500341AS",	"SD19",		ATA_HORKAGE_NONCQ |
4139
						ATA_HORKAGE_FIRMWARE_WARN },
4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193

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

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

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

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

	{ "ST3320613AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD19",		ATA_HORKAGE_NONCQ |
4194 4195
						ATA_HORKAGE_FIRMWARE_WARN },

4196 4197 4198 4199 4200
	/* 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, },
4201

4202 4203 4204 4205 4206
	/* 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 },
4207

4208 4209 4210
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4211
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4212

A
Alan Cox 已提交
4213 4214
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4215 4216 4217
	/* Maybe we should just blacklist TSSTcorp... */
	{ "TSSTcorp CDDVDW SH-S202H", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202H", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4218
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4219 4220 4221
	{ "TSSTcorp CDDVDW SH-S202J", "SB01",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4222

4223 4224 4225
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4226 4227
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4228
};
4229

4230
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4231 4232 4233 4234 4235 4236 4237 4238 4239 4240
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4241
	else {
4242
		len = strlen(name);
4243 4244 4245 4246 4247 4248
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4249 4250 4251 4252

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4253
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4254
{
T
Tejun Heo 已提交
4255 4256
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4257
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4258

T
Tejun Heo 已提交
4259 4260
	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
4261

4262
	while (ad->model_num) {
4263
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4264 4265
			if (ad->model_rev == NULL)
				return ad->horkage;
4266
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4267
				return ad->horkage;
4268
		}
4269
		ad++;
4270
	}
L
Linus Torvalds 已提交
4271 4272 4273
	return 0;
}

4274 4275 4276 4277 4278 4279
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
4280
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4281 4282
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4283
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4284 4285
}

A
Alan Cox 已提交
4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300
/**
 *	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);
}

4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318
/**
 *	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
4319
	/* If the controller thinks we are 40 wire, we are. */
4320 4321
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4322 4323

	/* If the controller thinks we are 80 wire, we are. */
4324 4325
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4326 4327 4328 4329 4330

	/* 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
4331 4332
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4333 4334 4335 4336 4337 4338 4339 4340 4341 4342

	/* 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
4343 4344 4345
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4346 4347 4348 4349 4350 4351
				return 0;
		}
	}
	return 1;
}

4352 4353 4354 4355
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4356 4357 4358 4359
 *	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...
4360 4361 4362 4363
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4364
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4365
{
T
Tejun Heo 已提交
4366 4367
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4368
	struct ata_host *host = ap->host;
4369
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4370

4371
	/* controller modes available */
4372 4373 4374
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4375
	/* drive modes available */
4376 4377 4378
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4379

4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390
	/*
	 *	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));
	}

4391 4392
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4393 4394
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4395
	}
4396

4397
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4398
	    host->simplex_claimed && host->simplex_claimed != ap) {
4399 4400 4401
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4402
	}
4403

J
Jeff Garzik 已提交
4404 4405 4406
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4407
	if (ap->ops->mode_filter)
4408
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4409

4410 4411 4412 4413 4414 4415 4416 4417 4418 4419
	/* 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 */
4420
		if (cable_is_40wire(ap)) {
4421
			ata_dev_printk(dev, KERN_WARNING,
4422 4423 4424 4425
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4426 4427
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4428 4429 4430 4431 4432 4433
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4434 4435 4436
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4437
 *	LOCKING:
J
Jeff Garzik 已提交
4438
 *	PCI/etc. bus probe sem.
4439 4440 4441
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4442 4443
 */

T
Tejun Heo 已提交
4444
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4445
{
4446
	struct ata_taskfile tf;
4447
	unsigned int err_mask;
L
Linus Torvalds 已提交
4448 4449 4450 4451

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

T
Tejun Heo 已提交
4452 4453 4454
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4455
	ata_tf_init(dev, &tf);
4456 4457
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4458
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4459
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4460
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4461 4462
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4463 4464
	/* 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
4465
		tf.nsect = 0x01;
A
Alan Cox 已提交
4466 4467
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4468

4469
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4470 4471 4472 4473 4474

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4475
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4476 4477
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4478
 *	@feature: The sector count represents the feature to set
4479 4480
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4481
 *	on port @ap with sector count
4482 4483 4484 4485 4486 4487 4488
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4489 4490
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502
{
	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;
4503
	tf.nsect = feature;
4504

4505
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4506

4507 4508
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4509 4510
}

4511 4512 4513
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4514 4515
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4516 4517
 *
 *	LOCKING:
4518 4519 4520 4521
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4522
 */
T
Tejun Heo 已提交
4523 4524
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4525
{
4526
	struct ata_taskfile tf;
4527
	unsigned int err_mask;
4528 4529 4530

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4531
		return AC_ERR_INVALID;
4532 4533 4534 4535

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

T
Tejun Heo 已提交
4536
	ata_tf_init(dev, &tf);
4537 4538 4539 4540 4541
	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 */
4542

4543
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4544 4545 4546 4547 4548
	/* 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;
4549

4550 4551
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4552 4553
}

L
Linus Torvalds 已提交
4554
/**
J
Jeff Garzik 已提交
4555 4556 4557 4558
 *	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
4559 4560
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4561
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4562
 */
4563
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4564 4565
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4566
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4567 4568
	int dir = qc->dma_dir;

4569
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4570

4571
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4572

4573 4574
	if (qc->n_elem)
		dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
L
Linus Torvalds 已提交
4575 4576

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4577
	qc->sg = NULL;
L
Linus Torvalds 已提交
4578 4579 4580
}

/**
4581
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4582 4583
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4584 4585 4586 4587
 *	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
4588
 *	LOCKING:
T
Tejun Heo 已提交
4589 4590 4591 4592 4593
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4594
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4595 4596
{
	struct ata_port *ap = qc->ap;
4597

T
Tejun Heo 已提交
4598 4599 4600
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4601 4602
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4603
		return 1;
4604

T
Tejun Heo 已提交
4605 4606
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4607

T
Tejun Heo 已提交
4608 4609
	return 0;
}
L
Linus Torvalds 已提交
4610

T
Tejun Heo 已提交
4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628
/**
 *	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;
4629

T
Tejun Heo 已提交
4630 4631 4632 4633 4634 4635 4636
	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;
	}
4637

T
Tejun Heo 已提交
4638 4639
	return ATA_DEFER_LINK;
}
4640

T
Tejun Heo 已提交
4641
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4642

T
Tejun Heo 已提交
4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662
/**
 *	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;
}
4663

T
Tejun Heo 已提交
4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680
/**
 *	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
4681

T
Tejun Heo 已提交
4682
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4683

T
Tejun Heo 已提交
4684 4685 4686
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4687

T
Tejun Heo 已提交
4688
	DPRINTK("%d sg elements mapped\n", n_elem);
4689

T
Tejun Heo 已提交
4690 4691
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4692

T
Tejun Heo 已提交
4693
	return 0;
L
Linus Torvalds 已提交
4694 4695
}

T
Tejun Heo 已提交
4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708
/**
 *	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)
4709
{
T
Tejun Heo 已提交
4710 4711
#ifdef __BIG_ENDIAN
	unsigned int i;
4712

T
Tejun Heo 已提交
4713 4714 4715
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4716 4717
}

4718 4719
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4720
 *	@ap: target port
4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747
 *
 *	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
4748 4749 4750 4751 4752
/**
 *	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
4753
 *	None.
L
Linus Torvalds 已提交
4754 4755
 */

4756
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4757
{
T
Tejun Heo 已提交
4758
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4759 4760
	struct ata_queued_cmd *qc;

4761
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4762 4763 4764 4765 4766
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4767
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4768 4769 4770 4771 4772
	}

	return qc;
}

4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787
/**
 *	ata_qc_free - free unused ata_queued_cmd
 *	@qc: Command to complete
 *
 *	Designed to free unused ata_queued_cmd object
 *	in case something prevents using it.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4788
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4789 4790 4791 4792 4793 4794 4795 4796 4797

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

4798
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4799
{
4800
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4801
	struct ata_link *link = qc->dev->link;
4802

4803 4804
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4805 4806 4807 4808

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

4809
	/* command should be marked inactive atomically with qc completion */
4810
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4811
		link->sactive &= ~(1 << qc->tag);
4812 4813 4814
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4815
		link->active_tag = ATA_TAG_POISON;
4816 4817 4818 4819 4820 4821 4822
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4823

4824 4825 4826 4827 4828
	/* 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;
4829
	ap->qc_active &= ~(1 << qc->tag);
4830

L
Linus Torvalds 已提交
4831
	/* call completion callback */
4832
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4833 4834
}

4835 4836 4837 4838 4839
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4840
	ap->ops->qc_fill_rtf(qc);
4841 4842
}

4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

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

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

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

	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}

4859 4860 4861 4862 4863 4864 4865 4866
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
 *	Indicate to the mid and upper layers that an ATA
 *	command has completed, with either an ok or not-ok status.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4867
 *	spin_lock_irqsave(host lock)
4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886
 */
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) {
4887 4888 4889
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4890
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
4891 4892 4893 4894 4895 4896 4897

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

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			if (!ata_tag_internal(qc->tag)) {
				/* always fill result TF for failed qc */
4898
				fill_result_tf(qc);
4899 4900 4901 4902 4903 4904 4905
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4906
			fill_result_tf(qc);
4907

4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922
		/* 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;
4923 4924 4925 4926

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4927 4928
		}

4929 4930 4931
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4932 4933 4934 4935 4936 4937 4938
		__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)
4939
			fill_result_tf(qc);
4940 4941 4942 4943 4944

		__ata_qc_complete(qc);
	}
}

4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *
 *	Complete in-flight commands.  This functions is meant to be
 *	called from low-level driver's interrupt routine to complete
 *	requests normally.  ap->qc_active and @qc_active is compared
 *	and commands are completed accordingly.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4956
 *	spin_lock_irqsave(host lock)
4957 4958 4959 4960
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4961
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989
{
	int nr_done = 0;
	u32 done_mask;
	int i;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
		ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
				"(%08x->%08x)\n", ap->qc_active, qc_active);
		return -EINVAL;
	}

	for (i = 0; i < ATA_MAX_QUEUE; i++) {
		struct ata_queued_cmd *qc;

		if (!(done_mask & (1 << i)))
			continue;

		if ((qc = ata_qc_from_tag(ap, i))) {
			ata_qc_complete(qc);
			nr_done++;
		}
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4990 4991 4992 4993 4994 4995 4996 4997 4998 4999
/**
 *	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
5000
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5001
 */
5002
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5003 5004
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5005
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
5006
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5007

5008 5009 5010 5011
	/* 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.
	 */
5012
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5013

5014
	if (ata_is_ncq(prot)) {
5015
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5016 5017 5018

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5019
		link->sactive |= 1 << qc->tag;
5020
	} else {
5021
		WARN_ON_ONCE(link->sactive);
5022 5023

		ap->nr_active_links++;
T
Tejun Heo 已提交
5024
		link->active_tag = qc->tag;
5025 5026
	}

5027
	qc->flags |= ATA_QCFLAG_ACTIVE;
5028
	ap->qc_active |= 1 << qc->tag;
5029

5030 5031 5032
	/* We guarantee to LLDs that they will have at least one
	 * non-zero sg if the command is a data command.
	 */
T
Tejun Heo 已提交
5033
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5034

T
Tejun Heo 已提交
5035
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5036
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5037 5038
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
5039

T
Tejun Heo 已提交
5040
	/* if device is sleeping, schedule reset and abort the link */
5041
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5042
		link->eh_info.action |= ATA_EH_RESET;
5043 5044 5045 5046 5047
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5048 5049
	ap->ops->qc_prep(qc);

5050 5051 5052 5053
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5054

5055
sg_err:
5056 5057 5058
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5059 5060
}

5061 5062
/**
 *	sata_scr_valid - test whether SCRs are accessible
5063
 *	@link: ATA link to test SCR accessibility for
5064
 *
5065
 *	Test whether SCRs are accessible for @link.
5066 5067 5068 5069 5070 5071 5072
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5073
int sata_scr_valid(struct ata_link *link)
5074
{
5075 5076
	struct ata_port *ap = link->ap;

5077
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5078 5079 5080 5081
}

/**
 *	sata_scr_read - read SCR register of the specified port
5082
 *	@link: ATA link to read SCR for
5083 5084 5085
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5086
 *	Read SCR register @reg of @link into *@val.  This function is
5087 5088
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5089 5090
 *
 *	LOCKING:
5091
 *	None if @link is ap->link.  Kernel thread context otherwise.
5092 5093 5094 5095
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5096
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5097
{
5098 5099
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5100
			return link->ap->ops->scr_read(link, reg, val);
5101 5102 5103 5104
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5105 5106 5107 5108
}

/**
 *	sata_scr_write - write SCR register of the specified port
5109
 *	@link: ATA link to write SCR for
5110 5111 5112
 *	@reg: SCR to write
 *	@val: value to write
 *
5113
 *	Write @val to SCR register @reg of @link.  This function is
5114 5115
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5116 5117
 *
 *	LOCKING:
5118
 *	None if @link is ap->link.  Kernel thread context otherwise.
5119 5120 5121 5122
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5123
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5124
{
5125 5126
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5127
			return link->ap->ops->scr_write(link, reg, val);
5128 5129
		return -EOPNOTSUPP;
	}
5130

5131
	return sata_pmp_scr_write(link, reg, val);
5132 5133 5134 5135
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5136
 *	@link: ATA link to write SCR for
5137 5138 5139 5140 5141 5142 5143
 *	@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:
5144
 *	None if @link is ap->link.  Kernel thread context otherwise.
5145 5146 5147 5148
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5149
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5150
{
5151 5152
	if (ata_is_host_link(link)) {
		int rc;
5153

5154
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5155
			rc = link->ap->ops->scr_write(link, reg, val);
5156
			if (rc == 0)
T
Tejun Heo 已提交
5157
				rc = link->ap->ops->scr_read(link, reg, &val);
5158 5159 5160
			return rc;
		}
		return -EOPNOTSUPP;
5161
	}
5162 5163

	return sata_pmp_scr_write(link, reg, val);
5164 5165 5166
}

/**
T
Tejun Heo 已提交
5167
 *	ata_phys_link_online - test whether the given link is online
5168
 *	@link: ATA link to test
5169
 *
5170 5171 5172
 *	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).
5173 5174 5175 5176 5177
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5178
 *	True if the port online status is available and online.
5179
 */
T
Tejun Heo 已提交
5180
bool ata_phys_link_online(struct ata_link *link)
5181 5182 5183
{
	u32 sstatus;

5184
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5185
	    ata_sstatus_online(sstatus))
5186 5187
		return true;
	return false;
5188 5189 5190
}

/**
T
Tejun Heo 已提交
5191
 *	ata_phys_link_offline - test whether the given link is offline
5192
 *	@link: ATA link to test
5193
 *
5194 5195 5196
 *	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).
5197 5198 5199 5200 5201
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5202
 *	True if the port offline status is available and offline.
5203
 */
T
Tejun Heo 已提交
5204
bool ata_phys_link_offline(struct ata_link *link)
5205 5206 5207
{
	u32 sstatus;

5208
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5209
	    !ata_sstatus_online(sstatus))
5210 5211
		return true;
	return false;
5212
}
E
Edward Falk 已提交
5213

T
Tejun Heo 已提交
5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265
/**
 *	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));
}

5266
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5267 5268 5269
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5270 5271 5272 5273
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5274 5275
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5276
		struct ata_link *link;
5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295

		/* 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
5296
		ata_for_each_link(link, ap, HOST_FIRST) {
5297 5298 5299
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317

		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
5318 5319
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5320 5321
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5322
 *	Suspend @host.  Actual operation is performed by EH.  This
5323 5324 5325 5326 5327 5328 5329 5330 5331
 *	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
5332
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5333
{
5334
	int rc;
5335

5336 5337 5338 5339 5340 5341
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5342
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5343 5344
	if (rc == 0)
		host->dev->power.power_state = mesg;
5345 5346 5347 5348
	return rc;
}

/**
J
Jeff Garzik 已提交
5349 5350
 *	ata_host_resume - resume host
 *	@host: host to resume
5351
 *
J
Jeff Garzik 已提交
5352
 *	Resume @host.  Actual operation is performed by EH.  This
5353 5354 5355 5356 5357 5358
 *	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
5359
void ata_host_resume(struct ata_host *host)
5360
{
T
Tejun Heo 已提交
5361
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5362
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5363
	host->dev->power.power_state = PMSG_ON;
5364 5365 5366

	/* reenable link pm */
	ata_lpm_disable(host);
5367
}
5368
#endif
5369

5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381
/**
 *	ata_port_start - Set port up for dma.
 *	@ap: Port to initialize
 *
 *	Called just after data structures for each port are
 *	initialized.  Allocates space for PRD table.
 *
 *	May be used as the port_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5382
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5383
{
5384
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5385

5386 5387
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5388 5389 5390 5391 5392 5393
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404
/**
 *	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
5405
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5406
	struct ata_port *ap = link->ap;
5407 5408
	unsigned long flags;

T
Tejun Heo 已提交
5409
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5410 5411
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5412

5413 5414
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5415
	 * host lock.
5416
	 */
5417
	spin_lock_irqsave(ap->lock, flags);
5418
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5419
	dev->horkage = 0;
5420
	spin_unlock_irqrestore(ap->lock, flags);
5421

5422 5423
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5424 5425 5426 5427 5428
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5429 5430 5431 5432
/**
 *	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
5433
 *	@pmp: Port multiplier port number
5434 5435 5436 5437 5438 5439
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5440
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5441 5442 5443 5444 5445 5446 5447
{
	int i;

	/* clear everything except for devices */
	memset(link, 0, offsetof(struct ata_link, device[0]));

	link->ap = ap;
T
Tejun Heo 已提交
5448
	link->pmp = pmp;
5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

	/* can't use iterator, ap isn't initialized yet */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &link->device[i];

		dev->link = link;
		dev->devno = dev - link->device;
		ata_dev_init(dev);
	}
}

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
5475
int sata_link_init_spd(struct ata_link *link)
5476
{
5477
	u8 spd;
5478 5479
	int rc;

T
Tejun Heo 已提交
5480
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5481 5482 5483
	if (rc)
		return rc;

T
Tejun Heo 已提交
5484
	spd = (link->saved_scontrol >> 4) & 0xf;
5485 5486 5487
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5488
	ata_force_link_limits(link);
5489

5490 5491 5492 5493 5494
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5495
/**
5496 5497
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5498
 *
5499 5500 5501 5502
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5503
 *
L
Linus Torvalds 已提交
5504
 *	LOCKING:
5505
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5506
 */
5507
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5508
{
5509
	struct ata_port *ap;
L
Linus Torvalds 已提交
5510

5511 5512 5513 5514 5515 5516
	DPRINTK("ENTER\n");

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

5517
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5518
	ap->lock = &host->lock;
5519
	ap->flags = ATA_FLAG_DISABLED;
5520
	ap->print_id = -1;
L
Linus Torvalds 已提交
5521
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5522
	ap->host = host;
5523
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5524
	ap->last_ctl = 0xFF;
5525 5526 5527 5528 5529 5530

#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
5531
#else
5532
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5533
#endif
L
Linus Torvalds 已提交
5534

T
Tejun Heo 已提交
5535
#ifdef CONFIG_ATA_SFF
5536
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5537 5538
#else
	INIT_DELAYED_WORK(&ap->port_task, NULL);
T
Tejun Heo 已提交
5539
#endif
5540 5541
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5542
	INIT_LIST_HEAD(&ap->eh_done_q);
5543
	init_waitqueue_head(&ap->eh_wait_q);
5544
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5545 5546 5547
	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
5548

5549 5550
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5551
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5552 5553 5554 5555 5556 5557 5558 5559

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

5560 5561 5562 5563 5564
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5565 5566 5567
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5568 5569 5570 5571
		if (!ap)
			continue;

		if (ap->scsi_host)
5572 5573
			scsi_host_put(ap->scsi_host);

5574
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5575
		kfree(ap->slave_link);
5576
		kfree(ap);
5577 5578 5579
		host->ports[i] = NULL;
	}

5580
	dev_set_drvdata(gendev, NULL);
5581 5582
}

5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return NULL;

	/* alloc a container for our list of ATA ports (buses) */
	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
	/* alloc a container for our list of ATA ports (buses) */
	host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
	if (!host)
		goto err_out;

	devres_add(dev, host);
	dev_set_drvdata(dev, host);

	spin_lock_init(&host->lock);
	host->dev = dev;
	host->n_ports = max_ports;

	/* allocate ports bound to this host */
	for (i = 0; i < max_ports; i++) {
		struct ata_port *ap;

		ap = ata_port_alloc(host);
		if (!ap)
			goto err_out;

		ap->port_no = i;
		host->ports[i] = ap;
	}

	devres_remove_group(dev, NULL);
	return host;

 err_out:
	devres_release_group(dev, NULL);
	return NULL;
}

5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685
/**
 *	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;
5686
		ap->link.flags |= pi->link_flags;
5687 5688 5689 5690 5691 5692 5693 5694 5695
		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
5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757
/**
 *	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;
}

5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775
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);
}

5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797
/**
 *	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)
{
5798
	static DEFINE_SPINLOCK(lock);
5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825
	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);
}

5826 5827 5828 5829 5830 5831 5832
/**
 *	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
5833 5834
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5835 5836 5837 5838 5839 5840 5841 5842 5843
 *
 *	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)
{
5844 5845
	int have_stop = 0;
	void *start_dr = NULL;
5846 5847 5848 5849 5850
	int i, rc;

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

5851 5852
	ata_finalize_port_ops(host->ops);

5853 5854 5855
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5856 5857
		ata_finalize_port_ops(ap->ops);

5858 5859 5860
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876
		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];

5877 5878 5879
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5880
				if (rc != -ENODEV)
A
Andrew Morton 已提交
5881 5882 5883
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
5884 5885 5886 5887 5888 5889
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5890 5891
	if (start_dr)
		devres_add(host->dev, start_dr);
5892 5893 5894 5895 5896 5897 5898 5899 5900 5901
	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);
	}
5902
	devres_free(start_dr);
5903 5904 5905
	return rc;
}

5906
/**
J
Jeff Garzik 已提交
5907 5908 5909 5910 5911
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5912 5913 5914 5915 5916
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5917
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5918
void ata_host_init(struct ata_host *host, struct device *dev,
5919
		   unsigned long flags, struct ata_port_operations *ops)
5920
{
J
Jeff Garzik 已提交
5921 5922 5923 5924
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5925 5926
}

5927 5928 5929 5930 5931

static void async_port_probe(void *data, async_cookie_t cookie)
{
	int rc;
	struct ata_port *ap = data;
5932 5933 5934 5935 5936

	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
5937 5938
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
5939
	 */
5940
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
5941 5942
		async_synchronize_cookie(cookie);

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
	/* probe */
	if (ap->ops->error_handler) {
		struct ata_eh_info *ehi = &ap->link.eh_info;
		unsigned long flags;

		ata_port_probe(ap);

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

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

		ap->pflags &= ~ATA_PFLAG_INITIALIZING;
		ap->pflags |= ATA_PFLAG_LOADING;
		ata_port_schedule_eh(ap);

		spin_unlock_irqrestore(ap->lock, flags);

		/* wait for EH to finish */
		ata_port_wait_eh(ap);
	} else {
		DPRINTK("ata%u: bus probe begin\n", ap->print_id);
		rc = ata_bus_probe(ap);
		DPRINTK("ata%u: bus probe end\n", ap->print_id);

		if (rc) {
			/* FIXME: do something useful here?
			 * Current libata behavior will
			 * tear down everything when
			 * the module is removed
			 * or the h/w is unplugged.
			 */
		}
	}
5979 5980 5981 5982 5983 5984

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

	ata_scsi_scan_host(ap, 1);

5985
}
5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
		dev_printk(KERN_ERR, host->dev,
			   "BUG: trying to register unstarted host\n");
		WARN_ON(1);
		return -EINVAL;
	}

	/* Blow away unused ports.  This happens when LLD can't
	 * determine the exact number of ports to allocate at
	 * allocation time.
	 */
	for (i = host->n_ports; host->ports[i]; i++)
		kfree(host->ports[i]);

	/* give ports names and add SCSI hosts */
	for (i = 0; i < host->n_ports; i++)
		host->ports[i]->print_id = ata_print_id++;

	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
		return rc;

6029 6030 6031
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6032 6033 6034 6035 6036 6037 6038 6039 6040 6041
	/* 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 */
6042
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6043 6044
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6045

6046
		/* print per-port info to dmesg */
6047 6048 6049
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6050
		if (!ata_port_is_dummy(ap)) {
6051 6052
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6053
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6054
					ata_mode_string(xfer_mask),
6055
					ap->link.eh_info.desc);
6056 6057
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6058 6059 6060 6061 6062 6063 6064
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6065
		async_schedule(async_port_probe, ap);
6066
	}
6067
	DPRINTK("probe end\n");
6068 6069 6070 6071

	return 0;
}

6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084
/**
 *	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.
 *
6085 6086 6087 6088
 *	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.
 *
6089 6090 6091 6092 6093 6094 6095 6096 6097 6098
 *	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)
{
6099
	int i, rc;
6100 6101 6102 6103 6104

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

6105 6106 6107 6108 6109 6110
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6111 6112 6113 6114 6115
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6116 6117
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6118

6119 6120 6121 6122 6123 6124 6125 6126
	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;
}

6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137
/**
 *	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).
 */
6138
static void ata_port_detach(struct ata_port *ap)
6139 6140 6141 6142
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6143
		goto skip_eh;
6144 6145

	/* tell EH we're leaving & flush EH */
6146
	spin_lock_irqsave(ap->lock, flags);
6147
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6148
	ata_port_schedule_eh(ap);
6149
	spin_unlock_irqrestore(ap->lock, flags);
6150

T
Tejun Heo 已提交
6151
	/* wait till EH commits suicide */
6152 6153
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6154 6155
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6156

6157
	cancel_rearming_delayed_work(&ap->hotplug_task);
6158

6159
 skip_eh:
6160
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6161
	scsi_remove_host(ap->scsi_host);
6162 6163
}

T
Tejun Heo 已提交
6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178
/**
 *	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]);
6179 6180 6181

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6182 6183
}

6184 6185
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6186 6187 6188 6189
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6190 6191 6192
 *	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
6193 6194 6195 6196
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6197
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6198
{
6199
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6200
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6201

T
Tejun Heo 已提交
6202
	ata_host_detach(host);
L
Linus Torvalds 已提交
6203 6204 6205
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6206
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237
{
	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
6238

6239
#ifdef CONFIG_PM
6240
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6241 6242
{
	pci_save_state(pdev);
6243
	pci_disable_device(pdev);
6244

6245
	if (mesg.event & PM_EVENT_SLEEP)
6246
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6247 6248
}

6249
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6250
{
6251 6252
	int rc;

J
Jens Axboe 已提交
6253 6254
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6255

T
Tejun Heo 已提交
6256
	rc = pcim_enable_device(pdev);
6257 6258 6259 6260 6261 6262
	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
6263
	pci_set_master(pdev);
6264
	return 0;
6265 6266
}

6267
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6268
{
J
Jeff Garzik 已提交
6269
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6270 6271
	int rc = 0;

J
Jeff Garzik 已提交
6272
	rc = ata_host_suspend(host, mesg);
6273 6274 6275
	if (rc)
		return rc;

6276
	ata_pci_device_do_suspend(pdev, mesg);
6277 6278 6279 6280 6281 6282

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6283
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6284
	int rc;
6285

6286 6287 6288 6289
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6290
}
6291 6292
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6293 6294
#endif /* CONFIG_PCI */

6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348
static int __init ata_parse_force_one(char **cur,
				      struct ata_force_ent *force_ent,
				      const char **reason)
{
	/* FIXME: Currently, there's no way to tag init const data and
	 * using __initdata causes build failure on some versions of
	 * gcc.  Once __initdataconst is implemented, add const to the
	 * following structure.
	 */
	static struct ata_force_param force_tbl[] __initdata = {
		{ "40c",	.cbl		= ATA_CBL_PATA40 },
		{ "80c",	.cbl		= ATA_CBL_PATA80 },
		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
		{ "sata",	.cbl		= ATA_CBL_SATA },
		{ "1.5Gbps",	.spd_limit	= 1 },
		{ "3.0Gbps",	.spd_limit	= 2 },
		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
		{ "pio0",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 0) },
		{ "pio1",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 1) },
		{ "pio2",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 2) },
		{ "pio3",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 3) },
		{ "pio4",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 4) },
		{ "pio5",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 5) },
		{ "pio6",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 6) },
		{ "mwdma0",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 0) },
		{ "mwdma1",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 1) },
		{ "mwdma2",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 2) },
		{ "mwdma3",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 3) },
		{ "mwdma4",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 4) },
		{ "udma0",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma/16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma1",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma/25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma2",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma/33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma3",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma/44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma4",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma/66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma5",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma/100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma6",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma/133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma7",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 7) },
6349 6350 6351
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471
	};
	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
6472 6473 6474

static int __init ata_init(void)
{
6475 6476
	ata_parse_force_param();

L
Linus Torvalds 已提交
6477 6478
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
6479
		goto free_force_tbl;
L
Linus Torvalds 已提交
6480

6481
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
6482 6483
	if (!ata_aux_wq)
		goto free_wq;
6484

L
Linus Torvalds 已提交
6485 6486
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6487 6488 6489 6490 6491 6492

free_wq:
	destroy_workqueue(ata_wq);
free_force_tbl:
	kfree(ata_force_tbl);
	return -ENOMEM;
L
Linus Torvalds 已提交
6493 6494 6495 6496
}

static void __exit ata_exit(void)
{
6497
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6498
	destroy_workqueue(ata_wq);
6499
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6500 6501
}

6502
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6503 6504
module_exit(ata_exit);

6505
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6506
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525

int ata_ratelimit(void)
{
	int rc;
	unsigned long flags;

	spin_lock_irqsave(&ata_ratelimit_lock, flags);

	if (time_after(jiffies, ratelimit_time)) {
		rc = 1;
		ratelimit_time = jiffies + (HZ/5);
	} else
		rc = 0;

	spin_unlock_irqrestore(&ata_ratelimit_lock, flags);

	return rc;
}

6526 6527 6528 6529 6530
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6531 6532
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6533 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.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6550
		      unsigned long interval, unsigned long timeout)
6551
{
6552
	unsigned long deadline;
6553 6554 6555 6556 6557 6558 6559 6560
	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.
	 */
6561
	deadline = ata_deadline(jiffies, timeout);
6562

6563 6564
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
		msleep(interval);
6565 6566 6567 6568 6569 6570
		tmp = ioread32(reg);
	}

	return tmp;
}

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

T
Tejun Heo 已提交
6579
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6580
{
T
Tejun Heo 已提交
6581
	/* truly dummy */
T
Tejun Heo 已提交
6582 6583
}

6584
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6585 6586
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6587
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6588 6589
};

6590 6591 6592 6593
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6594 6595 6596 6597 6598 6599
/*
 * 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.
 */
6600 6601 6602
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6603 6604
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6605
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6606
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6607 6608
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6609
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6610
EXPORT_SYMBOL_GPL(ata_host_init);
6611
EXPORT_SYMBOL_GPL(ata_host_alloc);
6612
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6613
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6614
EXPORT_SYMBOL_GPL(ata_host_start);
6615
EXPORT_SYMBOL_GPL(ata_host_register);
6616
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6617
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6618
EXPORT_SYMBOL_GPL(ata_sg_init);
6619
EXPORT_SYMBOL_GPL(ata_qc_complete);
6620
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6621
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6622 6623
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6624 6625 6626 6627 6628 6629 6630
EXPORT_SYMBOL_GPL(ata_pack_xfermask);
EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
EXPORT_SYMBOL_GPL(ata_mode_string);
EXPORT_SYMBOL_GPL(ata_id_xfermask);
L
Linus Torvalds 已提交
6631
EXPORT_SYMBOL_GPL(ata_port_start);
6632
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6633
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6634
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6635
EXPORT_SYMBOL_GPL(ata_port_probe);
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(ata_std_prereset);
T
Tejun Heo 已提交
6642
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6643
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6644
EXPORT_SYMBOL_GPL(ata_std_postreset);
6645 6646
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6647
EXPORT_SYMBOL_GPL(ata_port_disable);
6648
EXPORT_SYMBOL_GPL(ata_ratelimit);
6649
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6650 6651
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6652
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6653
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6654 6655 6656 6657
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);
6658 6659
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6660
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6661 6662
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6663
#endif /* CONFIG_PM */
6664 6665
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6666
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6667 6668
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6669
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6670
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6671 6672
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6673
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6674

L
Linus Torvalds 已提交
6675 6676 6677
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6678
#ifdef CONFIG_PM
6679 6680
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6681 6682
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6683
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6684
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6685

T
Tejun Heo 已提交
6686 6687 6688
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6689 6690 6691 6692
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6693
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6694
EXPORT_SYMBOL_GPL(ata_link_abort);
6695
EXPORT_SYMBOL_GPL(ata_port_abort);
6696
EXPORT_SYMBOL_GPL(ata_port_freeze);
6697
EXPORT_SYMBOL_GPL(sata_async_notification);
6698 6699
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6700 6701
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6702
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6703
EXPORT_SYMBOL_GPL(ata_do_eh);
6704
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6705 6706 6707 6708

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6709
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6710
EXPORT_SYMBOL_GPL(ata_cable_sata);