libata-core.c 172.6 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.h>
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/byteorder.h>
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#include <linux/cdrom.h>
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#include <linux/ratelimit.h>
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#include <linux/pm_runtime.h>
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#include "libata.h"
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#include "libata-transport.h"
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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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const struct ata_port_operations ata_base_port_ops = {
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	.prereset		= ata_std_prereset,
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	.postreset		= ata_std_postreset,
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	.error_handler		= ata_std_error_handler,
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};

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

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

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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
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static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
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unsigned int ata_print_id = 1;
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struct ata_force_param {
	const char	*name;
	unsigned int	cbl;
	int		spd_limit;
	unsigned long	xfer_mask;
	unsigned int	horkage_on;
	unsigned int	horkage_off;
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	unsigned int	lflags;
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};

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

static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;

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

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static int atapi_enabled = 1;
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module_param(atapi_enabled, int, 0444);
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MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
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static int atapi_dmadir = 0;
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module_param(atapi_dmadir, int, 0444);
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MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
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int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
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MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
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int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
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MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
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static int ata_ignore_hpa;
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module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");

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

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

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int libata_noacpi = 0;
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module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
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MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
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static int atapi_an;
module_param(atapi_an, int, 0444);
MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)");

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

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

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

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

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

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	return NULL;
}

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

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

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

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

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

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

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

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

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

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

		ap->cbl = fe->param.cbl;
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		ata_port_notice(ap, "FORCE: cable set to %s\n", fe->param.name);
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		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;
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			ata_link_notice(link, "FORCE: PHY spd limit set to %s\n",
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					fe->param.name);
			did_spd = true;
		}
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		/* let lflags stack */
		if (fe->param.lflags) {
			link->flags |= fe->param.lflags;
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			ata_link_notice(link,
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					"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;
		}

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

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

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

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

	case GPCMD_READ_CD:
	case GPCMD_READ_CD_MSF:
		return ATAPI_READ_CD;

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

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/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@pmp: Port multiplier port
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 *	@is_cmd: This FIS is for command
 *	@fis: Buffer into which data will output
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 *
 *	Converts a standard ATA taskfile to a Serial ATA
 *	FIS structure (Register - Host to Device).
 *
 *	LOCKING:
 *	Inherited from caller.
 */
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void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
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{
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	fis[0] = 0x27;			/* Register - Host to Device FIS */
	fis[1] = pmp & 0xf;		/* Port multiplier number*/
	if (is_cmd)
		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */

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	fis[2] = tf->command;
	fis[3] = tf->feature;

	fis[4] = tf->lbal;
	fis[5] = tf->lbam;
	fis[6] = tf->lbah;
	fis[7] = tf->device;

	fis[8] = tf->hob_lbal;
	fis[9] = tf->hob_lbam;
	fis[10] = tf->hob_lbah;
	fis[11] = tf->hob_feature;

	fis[12] = tf->nsect;
	fis[13] = tf->hob_nsect;
	fis[14] = 0;
	fis[15] = tf->ctl;

	fis[16] = 0;
	fis[17] = 0;
	fis[18] = 0;
	fis[19] = 0;
}

/**
 *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
 *	@fis: Buffer from which data will be input
 *	@tf: Taskfile to output
 *
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 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
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 *
 *	LOCKING:
 *	Inherited from caller.
 */

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void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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{
	tf->command	= fis[2];	/* status */
	tf->feature	= fis[3];	/* error */

	tf->lbal	= fis[4];
	tf->lbam	= fis[5];
	tf->lbah	= fis[6];
	tf->device	= fis[7];

	tf->hob_lbal	= fis[8];
	tf->hob_lbam	= fis[9];
	tf->hob_lbah	= fis[10];

	tf->nsect	= fis[12];
	tf->hob_nsect	= fis[13];
}

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static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
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	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
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	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
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	0,
	0,
	0,
	0,
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	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
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	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
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};
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/**
635
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
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 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
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 *	Examine the device configuration and tf->flags to calculate
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 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
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static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
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{
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	u8 cmd;
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	int index, fua, lba48, write;
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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
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	}
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	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
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}

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

	if (tf->flags & ATA_TFLAG_LBA) {
		if (tf->flags & ATA_TFLAG_LBA48) {
			block |= (u64)tf->hob_lbah << 40;
			block |= (u64)tf->hob_lbam << 32;
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			block |= (u64)tf->hob_lbal << 24;
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		} else
			block |= (tf->device & 0xf) << 24;

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

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

712
		if (!sect) {
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			ata_dev_warn(dev,
				     "device reported invalid CHS sector 0\n");
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			sect = 1; /* oh well */
		}

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

	return block;
}

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/**
 *	ata_build_rw_tf - Build ATA taskfile for given read/write request
 *	@tf: Target ATA taskfile
 *	@dev: ATA device @tf belongs to
 *	@block: Block address
 *	@n_block: Number of blocks
 *	@tf_flags: RW/FUA etc...
 *	@tag: tag
 *
 *	LOCKING:
 *	None.
 *
 *	Build ATA taskfile @tf for read/write request described by
 *	@block, @n_block, @tf_flags and @tag on @dev.
 *
 *	RETURNS:
 *
 *	0 on success, -ERANGE if the request is too large for @dev,
 *	-EINVAL if the request is invalid.
 */
int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
		    u64 block, u32 n_block, unsigned int tf_flags,
		    unsigned int tag)
{
	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf->flags |= tf_flags;

751
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
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		/* yay, NCQ */
		if (!lba_48_ok(block, n_block))
			return -ERANGE;

		tf->protocol = ATA_PROT_NCQ;
		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;

		if (tf->flags & ATA_TFLAG_WRITE)
			tf->command = ATA_CMD_FPDMA_WRITE;
		else
			tf->command = ATA_CMD_FPDMA_READ;

		tf->nsect = tag << 3;
		tf->hob_feature = (n_block >> 8) & 0xff;
		tf->feature = n_block & 0xff;

		tf->hob_lbah = (block >> 40) & 0xff;
		tf->hob_lbam = (block >> 32) & 0xff;
		tf->hob_lbal = (block >> 24) & 0xff;
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device = 1 << 6;
		if (tf->flags & ATA_TFLAG_FUA)
			tf->device |= 1 << 7;
	} else if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

		if (lba_28_ok(block, n_block)) {
			/* use LBA28 */
			tf->device |= (block >> 24) & 0xf;
		} else if (lba_48_ok(block, n_block)) {
			if (!(dev->flags & ATA_DFLAG_LBA48))
				return -ERANGE;

			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;

			tf->hob_nsect = (n_block >> 8) & 0xff;

			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
		} else
			/* request too large even for LBA48 */
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		tf->nsect = n_block & 0xff;

		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device |= ATA_LBA;
	} else {
		/* CHS */
		u32 sect, head, cyl, track;

		/* The request -may- be too large for CHS addressing. */
		if (!lba_28_ok(block, n_block))
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
			(u32)block, track, cyl, head, sect);

		/* Check whether the converted CHS can fit.
		   Cylinder: 0-65535
		   Head: 0-15
		   Sector: 1-255*/
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
			return -ERANGE;

		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
	}

	return 0;
}

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/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
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unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
865 866 867 868 869 870
{
	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}

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/**
 *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 *	@xfer_mask: xfer_mask to unpack
 *	@pio_mask: resulting pio_mask
 *	@mwdma_mask: resulting mwdma_mask
 *	@udma_mask: resulting udma_mask
 *
 *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 *	Any NULL distination masks will be ignored.
 */
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void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
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{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

892
static const struct ata_xfer_ent {
893
	int shift, bits;
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	u8 base;
} ata_xfer_tbl[] = {
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	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
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	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
913
 *	Matching XFER_* value, 0xff if no match found.
914
 */
915
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
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{
	int highbit = fls(xfer_mask) - 1;
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
			return ent->base + highbit - ent->shift;
923
	return 0xff;
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}

/**
 *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_mask for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mask, 0 if no match found.
 */
938
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
939 940 941 942 943
{
	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)
944 945
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
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	return 0;
}

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
961
int ata_xfer_mode2shift(unsigned long xfer_mode)
962 963 964 965 966 967 968 969 970
{
	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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/**
972 973
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
976
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
983
 *	@mode_mask, or the constant C string "<n/a>".
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 */
985
const char *ata_mode_string(unsigned long xfer_mask)
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{
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	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
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		"PIO5",
		"PIO6",
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		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
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		"MWDMA3",
		"MWDMA4",
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		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
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	int highbit;
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	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
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	return "<n/a>";
}

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const char *sata_spd_string(unsigned int spd)
1018 1019 1020 1021
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1022
		"6.0 Gbps",
1023 1024 1025 1026 1027 1028 1029
	};

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

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/**
 *	ata_dev_classify - determine device type based on ATA-spec signature
 *	@tf: ATA taskfile register set for device to be identified
 *
 *	Determine from taskfile register contents whether a device is
 *	ATA or ATAPI, as per "Signature and persistence" section
 *	of ATA/PI spec (volume 1, sect 5.14).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
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 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
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{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
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	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
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	 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
	 * SEMB signature.  This is worked around in
	 * ata_dev_read_id().
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	 */
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	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

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

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

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

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

/**
1093
 *	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.
 */

1107 1108
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

1112 1113
	BUG_ON(len & 1);

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

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

		ofs++;
		len -= 2;
	}
}

1128
/**
1129
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1130 1131 1132 1133 1134
 *	@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.
 *
1135
 *	This function is identical to ata_id_string except that it
1136 1137 1138 1139 1140 1141
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1142 1143
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1144 1145 1146
{
	unsigned char *p;

1147
	ata_id_string(id, s, ofs, len - 1);
1148 1149 1150 1151 1152 1153

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
Edward Falk 已提交
1154

T
Tejun Heo 已提交
1155 1156 1157 1158
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1159
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
T
Tejun Heo 已提交
1160
		else
1161
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
T
Tejun Heo 已提交
1162 1163
	} else {
		if (ata_id_current_chs_valid(id))
1164 1165
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
T
Tejun Heo 已提交
1166
		else
1167 1168
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
T
Tejun Heo 已提交
1169 1170 1171
	}
}

1172
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1173 1174 1175 1176 1177
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1178
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
A
Alan Cox 已提交
1179 1180 1181 1182
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1183
	return sectors;
A
Alan Cox 已提交
1184 1185
}

1186
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1187 1188 1189 1190 1191 1192 1193 1194
{
	u64 sectors = 0;

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

1195
	return sectors;
A
Alan Cox 已提交
1196 1197 1198
}

/**
1199 1200 1201
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
Alan Cox 已提交
1202
 *
1203 1204
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
Alan Cox 已提交
1205
 *
1206 1207 1208
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
Alan Cox 已提交
1209
 */
1210
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1211
{
1212
	unsigned int err_mask;
A
Alan Cox 已提交
1213
	struct ata_taskfile tf;
1214
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1215 1216 1217

	ata_tf_init(dev, &tf);

1218
	/* always clear all address registers */
A
Alan Cox 已提交
1219 1220
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1221 1222 1223 1224 1225
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
Alan Cox 已提交
1226 1227

	tf.protocol |= ATA_PROT_NODATA;
1228 1229
	tf.device |= ATA_LBA;

1230
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1231
	if (err_mask) {
1232 1233 1234
		ata_dev_warn(dev,
			     "failed to read native max address (err_mask=0x%x)\n",
			     err_mask);
1235 1236 1237 1238
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
A
Alan Cox 已提交
1239

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

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

	new_sectors--;

	ata_tf_init(dev, &tf);

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

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

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
T
Tejun Heo 已提交
1280
	} else {
1281 1282
		tf.command = ATA_CMD_SET_MAX;

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

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

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

1293
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1294
	if (err_mask) {
1295 1296 1297
		ata_dev_warn(dev,
			     "failed to set max address (err_mask=0x%x)\n",
			     err_mask);
1298 1299 1300 1301 1302 1303 1304
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
A
Alan Cox 已提交
1305 1306 1307 1308 1309 1310 1311 1312 1313
}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
T
Tejun Heo 已提交
1314 1315 1316
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
Alan Cox 已提交
1317
 */
T
Tejun Heo 已提交
1318
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1319
{
T
Tejun Heo 已提交
1320 1321
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
T
Tejun Heo 已提交
1322
	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
T
Tejun Heo 已提交
1323 1324
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1325
	int rc;
J
Jeff Garzik 已提交
1326

T
Tejun Heo 已提交
1327 1328 1329 1330
	/* 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))
1331
		return 0;
A
Alan Cox 已提交
1332

T
Tejun Heo 已提交
1333 1334 1335
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
Tejun Heo 已提交
1336 1337
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1338
		 */
T
Tejun Heo 已提交
1339
		if (rc == -EACCES || !unlock_hpa) {
1340 1341
			ata_dev_warn(dev,
				     "HPA support seems broken, skipping HPA handling\n");
T
Tejun Heo 已提交
1342 1343 1344 1345 1346
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
Alan Cox 已提交
1347
		}
T
Tejun Heo 已提交
1348

T
Tejun Heo 已提交
1349 1350
		return rc;
	}
T
Tejun Heo 已提交
1351
	dev->n_native_sectors = native_sectors;
T
Tejun Heo 已提交
1352 1353

	/* nothing to do? */
T
Tejun Heo 已提交
1354
	if (native_sectors <= sectors || !unlock_hpa) {
T
Tejun Heo 已提交
1355 1356 1357 1358
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
1359
			ata_dev_info(dev,
T
Tejun Heo 已提交
1360 1361 1362 1363
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
1364 1365
			ata_dev_warn(dev,
				"native sectors (%llu) is smaller than sectors (%llu)\n",
T
Tejun Heo 已提交
1366 1367 1368 1369 1370 1371 1372 1373 1374
				(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 */
1375 1376 1377 1378
		ata_dev_warn(dev,
			     "device aborted resize (%llu -> %llu), skipping HPA handling\n",
			     (unsigned long long)sectors,
			     (unsigned long long)native_sectors);
T
Tejun Heo 已提交
1379 1380 1381 1382 1383 1384 1385 1386
		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) {
1387 1388
		ata_dev_err(dev,
			    "failed to re-read IDENTIFY data after HPA resizing\n");
T
Tejun Heo 已提交
1389 1390 1391 1392 1393
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
1394
		ata_dev_info(dev,
T
Tejun Heo 已提交
1395 1396 1397 1398 1399 1400 1401
			"HPA unlocked: %llu -> %llu, native %llu\n",
			(unsigned long long)sectors,
			(unsigned long long)new_sectors,
			(unsigned long long)native_sectors);
	}

	return 0;
A
Alan Cox 已提交
1402 1403
}

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

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

1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
1458
unsigned long ata_id_xfermask(const u16 *id)
1459
{
1460
	unsigned long pio_mask, mwdma_mask, udma_mask;
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1472
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1473
		if (mode < 5)	/* Valid PIO range */
1474
			pio_mask = (2 << mode) - 1;
1475 1476
		else
			pio_mask = 1;
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486

		/* But wait.. there's more. Design your standards by
		 * committee and you too can get a free iordy field to
		 * process. However its the speeds not the modes that
		 * are supported... Note drivers using the timing API
		 * will get this right anyway
		 */
	}

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1487

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

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

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

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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

	complete(waiting);
}

/**
1520
 *	ata_exec_internal_sg - execute libata internal command
1521 1522
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1523
 *	@cdb: CDB for packet command
1524
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1525
 *	@sgl: sg list for the data buffer of the command
1526
 *	@n_elem: Number of sg entries
1527
 *	@timeout: Timeout in msecs (0 for default)
1528 1529 1530 1531 1532 1533 1534 1535 1536
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1537 1538 1539
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1540
 */
1541 1542
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1543
			      int dma_dir, struct scatterlist *sgl,
1544
			      unsigned int n_elem, unsigned long timeout)
1545
{
T
Tejun Heo 已提交
1546 1547
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1548
	u8 command = tf->command;
1549
	int auto_timeout = 0;
1550
	struct ata_queued_cmd *qc;
1551
	unsigned int tag, preempted_tag;
1552
	u32 preempted_sactive, preempted_qc_active;
1553
	int preempted_nr_active_links;
1554
	DECLARE_COMPLETION_ONSTACK(wait);
1555
	unsigned long flags;
1556
	unsigned int err_mask;
1557
	int rc;
1558

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

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

1567
	/* initialize internal qc */
1568

1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

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

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

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

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

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

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

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

1618
	ata_qc_issue(qc);
1619

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

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

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

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

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

1639
	ata_sff_flush_pio_task(ap);
1640

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

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

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

1657
			if (ata_msg_warn(ap))
1658 1659
				ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
					     command);
1660 1661
		}

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

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

1669 1670 1671 1672 1673 1674 1675 1676 1677 1678
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

		if (!qc->err_mask)
			qc->err_mask |= AC_ERR_OTHER;

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1679 1680
	}

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

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

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

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

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

1698
	return err_mask;
1699 1700
}

1701
/**
1702
 *	ata_exec_internal - execute libata internal command
1703 1704 1705 1706 1707 1708
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
1709
 *	@timeout: Timeout in msecs (0 for default)
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
1722 1723
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1724
{
1725 1726
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1727

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

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

1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1752
 */
1753
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1754 1755 1756 1757 1758 1759 1760 1761 1762
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

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

1766 1767 1768 1769 1770 1771 1772 1773 1774
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
T
Tejun Heo 已提交
1775 1776 1777 1778 1779 1780 1781 1782 1783
	/* Don't set IORDY if we're preparing for reset.  IORDY may
	 * lead to controller lock up on certain controllers if the
	 * port is not occupied.  See bko#11703 for details.
	 */
	if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
		return 0;
	/* Controller doesn't support IORDY.  Probably a pointless
	 * check as the caller should know this.
	 */
T
Tejun Heo 已提交
1784
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1785
		return 0;
1786 1787 1788 1789
	/* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
	if (ata_id_is_cfa(adev->id)
	    && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
		return 0;
A
Alan Cox 已提交
1790 1791 1792 1793 1794
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1795
		return 1;
A
Alan Cox 已提交
1796 1797
	return 0;
}
1798

A
Alan Cox 已提交
1799 1800 1801 1802 1803 1804 1805 1806 1807
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1808 1809
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1810
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1811 1812 1813 1814
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1815 1816
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1817 1818
		}
	}
A
Alan Cox 已提交
1819
	return 3 << ATA_SHIFT_PIO;
1820 1821
}

1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
/**
 *	ata_do_dev_read_id		-	default ID read method
 *	@dev: device
 *	@tf: proposed taskfile
 *	@id: data buffer
 *
 *	Issue the identify taskfile and hand back the buffer containing
 *	identify data. For some RAID controllers and for pre ATA devices
 *	this function is wrapped or replaced by the driver
 */
unsigned int ata_do_dev_read_id(struct ata_device *dev,
					struct ata_taskfile *tf, u16 *id)
{
	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
}

L
Linus Torvalds 已提交
1839
/**
1840 1841 1842
 *	ata_dev_read_id - Read ID data from the specified device
 *	@dev: target device
 *	@p_class: pointer to class of the target device (may be changed)
1843
 *	@flags: ATA_READID_* flags
1844
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1845
 *
1846 1847
 *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
 *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
T
Tejun Heo 已提交
1848 1849
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1850
 *
1851
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1852
 *	now we abort if we hit that case.
1853
 *
L
Linus Torvalds 已提交
1854
 *	LOCKING:
1855 1856 1857 1858
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1859
 */
1860
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1861
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1862
{
T
Tejun Heo 已提交
1863
	struct ata_port *ap = dev->link->ap;
1864
	unsigned int class = *p_class;
1865
	struct ata_taskfile tf;
1866 1867
	unsigned int err_mask = 0;
	const char *reason;
T
Tejun Heo 已提交
1868
	bool is_semb = class == ATA_DEV_SEMB;
1869
	int may_fallback = 1, tried_spinup = 0;
1870
	int rc;
L
Linus Torvalds 已提交
1871

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

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

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

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

	/* Some devices choke if TF registers contain garbage.  Make
	 * sure those are properly initialized.
	 */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1904

1905 1906 1907 1908 1909
	if (ap->ops->read_id)
		err_mask = ap->ops->read_id(dev, &tf, id);
	else
		err_mask = ata_do_dev_read_id(dev, &tf, id);

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

T
Tejun Heo 已提交
1916
		if (is_semb) {
1917 1918
			ata_dev_info(dev,
		     "IDENTIFY failed on device w/ SEMB sig, disabled\n");
T
Tejun Heo 已提交
1919 1920 1921 1922 1923
			/* SEMB is not supported yet */
			*p_class = ATA_DEV_SEMB_UNSUP;
			return 0;
		}

1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
		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.
			 */
1944 1945
			ata_dev_dbg(dev,
				    "both IDENTIFYs aborted, assuming NODEV\n");
1946
			return -ENOENT;
1947 1948
		}

1949 1950
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1951 1952 1953
		goto err_out;
	}

1954
	if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1955 1956 1957
		ata_dev_dbg(dev, "dumping IDENTIFY data, "
			    "class=%d may_fallback=%d tried_spinup=%d\n",
			    class, may_fallback, tried_spinup);
1958 1959 1960 1961
		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
			       16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
	}

1962 1963 1964 1965 1966
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1967
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1968

1969
	/* sanity check */
1970
	rc = -EINVAL;
A
Alan Cox 已提交
1971
	reason = "device reports invalid type";
1972 1973 1974 1975 1976 1977 1978

	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;
1979 1980
	}

1981 1982 1983 1984 1985 1986 1987
	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.
		 */
1988
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1989
		if (err_mask && id[2] != 0x738c) {
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001
			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;
	}

2002
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2003 2004 2005
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2006 2007
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2008 2009
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2010 2011
		 *
		 * Note that ATA4 says lba is mandatory so the second check
2012
		 * should never trigger.
2013 2014
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2015
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2016 2017 2018 2019 2020 2021 2022 2023 2024
			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.
			 */
2025
			flags &= ~ATA_READID_POSTRESET;
2026 2027 2028 2029 2030
			goto retry;
		}
	}

	*p_class = class;
2031

2032 2033 2034
	return 0;

 err_out:
T
Tejun Heo 已提交
2035
	if (ata_msg_warn(ap))
2036 2037
		ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
			     reason, err_mask);
2038 2039 2040
	return rc;
}

2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066
static int ata_do_link_spd_horkage(struct ata_device *dev)
{
	struct ata_link *plink = ata_dev_phys_link(dev);
	u32 target, target_limit;

	if (!sata_scr_valid(plink))
		return 0;

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

	target_limit = (1 << target) - 1;

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

	plink->sata_spd_limit = target_limit;

	/* Request another EH round by returning -EAGAIN if link is
	 * going faster than the target speed.  Forward progress is
	 * guaranteed by setting sata_spd_limit to target_limit above.
	 */
	if (plink->sata_spd > target) {
2067 2068
		ata_dev_info(dev, "applying link speed limit horkage to %s\n",
			     sata_spd_string(target));
2069 2070 2071 2072 2073
		return -EAGAIN;
	}
	return 0;
}

T
Tejun Heo 已提交
2074
static inline u8 ata_dev_knobble(struct ata_device *dev)
2075
{
T
Tejun Heo 已提交
2076
	struct ata_port *ap = dev->link->ap;
2077 2078 2079 2080

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

T
Tejun Heo 已提交
2081
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2082 2083
}

2084
static int ata_dev_config_ncq(struct ata_device *dev,
2085 2086
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2087
	struct ata_port *ap = dev->link->ap;
2088
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2089 2090
	unsigned int err_mask;
	char *aa_desc = "";
2091 2092 2093

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2094
		return 0;
2095
	}
T
Tejun Heo 已提交
2096
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2097
		snprintf(desc, desc_sz, "NCQ (not used)");
2098
		return 0;
2099
	}
2100
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2101
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2102 2103 2104
		dev->flags |= ATA_DFLAG_NCQ;
	}

2105 2106 2107 2108 2109 2110
	if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
		(ap->flags & ATA_FLAG_FPDMA_AA) &&
		ata_id_has_fpdma_aa(dev->id)) {
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
			SATA_FPDMA_AA);
		if (err_mask) {
2111 2112 2113
			ata_dev_err(dev,
				    "failed to enable AA (error_mask=0x%x)\n",
				    err_mask);
2114 2115 2116 2117 2118 2119 2120 2121
			if (err_mask != AC_ERR_DEV) {
				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
				return -EIO;
			}
		} else
			aa_desc = ", AA";
	}

2122
	if (hdepth >= ddepth)
2123
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2124
	else
2125 2126 2127
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
	return 0;
2128 2129
}

2130
/**
2131 2132 2133 2134 2135
 *	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.
2136 2137
 *
 *	LOCKING:
2138 2139 2140 2141
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2142
 */
2143
int ata_dev_configure(struct ata_device *dev)
2144
{
T
Tejun Heo 已提交
2145 2146
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2147
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2148
	const u16 *id = dev->id;
2149
	unsigned long xfer_mask;
2150
	char revbuf[7];		/* XYZ-99\0 */
2151 2152
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2153
	int rc;
2154

2155
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2156
		ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2157
		return 0;
2158 2159
	}

2160
	if (ata_msg_probe(ap))
2161
		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2162

T
Tejun Heo 已提交
2163 2164
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2165
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2166

2167
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
2168
		ata_dev_info(dev, "unsupported device, disabling\n");
2169 2170 2171 2172
		ata_dev_disable(dev);
		return 0;
	}

2173 2174
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
2175 2176 2177
		ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
			     atapi_enabled ? "not supported with this driver"
			     : "disabled");
2178 2179 2180 2181
		ata_dev_disable(dev);
		return 0;
	}

2182 2183 2184 2185
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2186 2187 2188 2189
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2190

T
Tejun Heo 已提交
2191 2192 2193 2194 2195
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2196
	/* print device capabilities */
2197
	if (ata_msg_probe(ap))
2198 2199 2200 2201 2202 2203
		ata_dev_dbg(dev,
			    "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			    "85:%04x 86:%04x 87:%04x 88:%04x\n",
			    __func__,
			    id[49], id[82], id[83], id[84],
			    id[85], id[86], id[87], id[88]);
2204

2205
	/* initialize to-be-configured parameters */
2206
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2207 2208 2209 2210 2211 2212
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2213
	dev->multi_count = 0;
2214

L
Linus Torvalds 已提交
2215 2216 2217 2218
	/*
	 * common ATA, ATAPI feature tests
	 */

2219
	/* find max transfer mode; for printk only */
2220
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2221

2222 2223
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2224

2225 2226 2227 2228 2229 2230 2231
	/* 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
2232 2233
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2234
		if (ata_id_is_cfa(id)) {
S
Sergei Shtylyov 已提交
2235 2236
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2237 2238
				ata_dev_warn(dev,
	"supports DRM functions and may not be fully accessible\n");
2239
			snprintf(revbuf, 7, "CFA");
2240
		} else {
2241
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2242 2243
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
2244 2245
				ata_dev_warn(dev,
	"supports DRM functions and may not be fully accessible\n");
2246
		}
2247

2248
		dev->n_sectors = ata_id_n_sectors(id);
2249

2250 2251 2252 2253 2254 2255 2256 2257 2258
		/* get current R/W Multiple count setting */
		if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
			unsigned int max = dev->id[47] & 0xff;
			unsigned int cnt = dev->id[59] & 0xff;
			/* only recognize/allow powers of two here */
			if (is_power_of_2(max) && is_power_of_2(cnt))
				if (cnt <= max)
					dev->multi_count = cnt;
		}
2259

2260
		if (ata_id_has_lba(id)) {
2261
			const char *lba_desc;
2262
			char ncq_desc[24];
2263

2264 2265
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2266
			if (ata_id_has_lba48(id)) {
2267
				dev->flags |= ATA_DFLAG_LBA48;
2268
				lba_desc = "LBA48";
2269 2270 2271 2272

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2273
			}
2274

2275
			/* config NCQ */
2276 2277 2278
			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
			if (rc)
				return rc;
2279

2280
			/* print device info to dmesg */
2281
			if (ata_msg_drv(ap) && print_info) {
2282 2283 2284 2285 2286
				ata_dev_info(dev, "%s: %s, %s, max %s\n",
					     revbuf, modelbuf, fwrevbuf,
					     ata_mode_string(xfer_mask));
				ata_dev_info(dev,
					     "%llu sectors, multi %u: %s %s\n",
2287
					(unsigned long long)dev->n_sectors,
2288 2289
					dev->multi_count, lba_desc, ncq_desc);
			}
2290
		} else {
2291 2292 2293
			/* CHS */

			/* Default translation */
2294 2295 2296
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2297

2298
			if (ata_id_current_chs_valid(id)) {
2299
				/* Current CHS translation is valid. */
2300 2301 2302
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2303 2304 2305
			}

			/* print device info to dmesg */
2306
			if (ata_msg_drv(ap) && print_info) {
2307 2308 2309 2310 2311 2312 2313 2314
				ata_dev_info(dev, "%s: %s, %s, max %s\n",
					     revbuf,	modelbuf, fwrevbuf,
					     ata_mode_string(xfer_mask));
				ata_dev_info(dev,
					     "%llu sectors, multi %u, CHS %u/%u/%u\n",
					     (unsigned long long)dev->n_sectors,
					     dev->multi_count, dev->cylinders,
					     dev->heads, dev->sectors);
2315
			}
2316 2317
		}

2318
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2319 2320 2321
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2322
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2323 2324
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2325
		const char *dma_dir_string = "";
2326
		u32 sntf;
2327

2328
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2329
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2330
			if (ata_msg_warn(ap))
2331
				ata_dev_warn(dev, "unsupported CDB len\n");
2332
			rc = -EINVAL;
L
Linus Torvalds 已提交
2333 2334
			goto err_out_nosup;
		}
2335
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2336

2337 2338 2339 2340
		/* 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.
2341
		 */
T
Tejun Heo 已提交
2342 2343
		if (atapi_an &&
		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2344
		    (!sata_pmp_attached(ap) ||
2345
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2346 2347
			unsigned int err_mask;

2348
			/* issue SET feature command to turn this on */
2349 2350
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2351
			if (err_mask)
2352 2353 2354
				ata_dev_err(dev,
					    "failed to enable ATAPI AN (err_mask=0x%x)\n",
					    err_mask);
T
Tejun Heo 已提交
2355
			else {
2356
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2357 2358
				atapi_an_string = ", ATAPI AN";
			}
2359 2360
		}

2361
		if (ata_id_cdb_intr(dev->id)) {
2362
			dev->flags |= ATA_DFLAG_CDB_INTR;
2363 2364
			cdb_intr_string = ", CDB intr";
		}
2365

2366 2367 2368 2369 2370
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2371
		/* print device info to dmesg */
2372
		if (ata_msg_drv(ap) && print_info)
2373 2374 2375 2376 2377 2378
			ata_dev_info(dev,
				     "ATAPI: %s, %s, max %s%s%s%s\n",
				     modelbuf, fwrevbuf,
				     ata_mode_string(xfer_mask),
				     cdb_intr_string, atapi_an_string,
				     dma_dir_string);
L
Linus Torvalds 已提交
2379 2380
	}

2381 2382 2383 2384 2385
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2386 2387
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2388
	if (ata_dev_knobble(dev)) {
2389
		if (ata_msg_drv(ap) && print_info)
2390
			ata_dev_info(dev, "applying bridge limits\n");
2391
		dev->udma_mask &= ATA_UDMA5;
2392 2393 2394
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2395
	if ((dev->class == ATA_DEV_ATAPI) &&
2396
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2397
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2398 2399
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2400

T
Tejun Heo 已提交
2401
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2402 2403
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2404

2405
	if (ap->ops->dev_config)
2406
		ap->ops->dev_config(dev);
2407

2408 2409 2410 2411 2412 2413 2414 2415
	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) {
2416
			ata_dev_warn(dev,
2417
"Drive reports diagnostics failure. This may indicate a drive\n");
2418
			ata_dev_warn(dev,
2419 2420 2421 2422
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2423
	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2424 2425
		ata_dev_warn(dev, "WARNING: device requires firmware update to be fully functional\n");
		ata_dev_warn(dev, "         contact the vendor or visit http://ata.wiki.kernel.org\n");
2426 2427
	}

2428
	return 0;
L
Linus Torvalds 已提交
2429 2430

err_out_nosup:
2431
	if (ata_msg_probe(ap))
2432
		ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2433
	return rc;
L
Linus Torvalds 已提交
2434 2435
}

A
Alan Cox 已提交
2436
/**
2437
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2438 2439
 *	@ap: port
 *
2440
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2441 2442 2443 2444 2445 2446 2447 2448 2449
 *	detection.
 */

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

/**
2450
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2451 2452
 *	@ap: port
 *
2453
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473
 *	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
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485
/**
 *	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
2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497
/**
 *	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
2498 2499 2500 2501
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2502 2503 2504 2505
 *	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
2506
 *	LOCKING:
J
Jeff Garzik 已提交
2507
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2508 2509
 *
 *	RETURNS:
2510
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2511 2512
 */

2513
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2514
{
2515
	unsigned int classes[ATA_MAX_DEVICES];
2516
	int tries[ATA_MAX_DEVICES];
2517
	int rc;
2518
	struct ata_device *dev;
L
Linus Torvalds 已提交
2519

T
Tejun Heo 已提交
2520
	ata_for_each_dev(dev, &ap->link, ALL)
2521
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2522 2523

 retry:
T
Tejun Heo 已提交
2524
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542
		/* 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);
	}

2543
	/* reset and determine device classes */
2544
	ap->ops->phy_reset(ap);
2545

T
Tejun Heo 已提交
2546
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2547
		if (dev->class != ATA_DEV_UNKNOWN)
2548 2549 2550
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2551

2552
		dev->class = ATA_DEV_UNKNOWN;
2553
	}
L
Linus Torvalds 已提交
2554

2555 2556 2557 2558
	/* 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
2559
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2560 2561
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2562

2563
		if (!ata_dev_enabled(dev))
2564 2565
			continue;

2566 2567
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2568 2569
		if (rc)
			goto fail;
2570 2571
	}

A
Alan Cox 已提交
2572 2573 2574 2575
	/* 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
2576 2577 2578 2579 2580 2581
	/* 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
2582 2583 2584
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2585 2586 2587
	/* 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
2588
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2589
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2590
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2591
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2592 2593
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2594 2595
	}

2596
	/* configure transfer mode */
2597
	rc = ata_set_mode(&ap->link, &dev);
2598
	if (rc)
2599
		goto fail;
L
Linus Torvalds 已提交
2600

T
Tejun Heo 已提交
2601 2602
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2603

2604
	return -ENODEV;
2605 2606

 fail:
2607 2608
	tries[dev->devno]--;

2609 2610
	switch (rc) {
	case -EINVAL:
2611
		/* eeek, something went very wrong, give up */
2612 2613
		tries[dev->devno] = 0;
		break;
2614 2615 2616 2617

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2618
	case -EIO:
2619 2620 2621 2622
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2623
			sata_down_spd_limit(&ap->link, 0);
2624 2625
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2626 2627
	}

2628
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2629
		ata_dev_disable(dev);
2630

2631
	goto retry;
L
Linus Torvalds 已提交
2632 2633
}

2634 2635
/**
 *	sata_print_link_status - Print SATA link status
2636
 *	@link: SATA link to printk link status about
2637 2638 2639 2640 2641 2642
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2643
static void sata_print_link_status(struct ata_link *link)
2644
{
2645
	u32 sstatus, scontrol, tmp;
2646

2647
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2648
		return;
2649
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2650

T
Tejun Heo 已提交
2651
	if (ata_phys_link_online(link)) {
2652
		tmp = (sstatus >> 4) & 0xf;
2653 2654
		ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
			      sata_spd_string(tmp), sstatus, scontrol);
2655
	} else {
2656 2657
		ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
			      sstatus, scontrol);
2658 2659 2660
	}
}

2661 2662 2663 2664 2665 2666 2667
/**
 *	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
 */
2668

T
Tejun Heo 已提交
2669
struct ata_device *ata_dev_pair(struct ata_device *adev)
2670
{
T
Tejun Heo 已提交
2671 2672
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2673
	if (!ata_dev_enabled(pair))
2674 2675 2676 2677
		return NULL;
	return pair;
}

2678
/**
2679
 *	sata_down_spd_limit - adjust SATA spd limit downward
2680
 *	@link: Link to adjust SATA spd limit for
2681
 *	@spd_limit: Additional limit
2682
 *
2683
 *	Adjust SATA spd limit of @link downward.  Note that this
2684
 *	function only adjusts the limit.  The change must be applied
2685
 *	using sata_set_spd().
2686
 *
2687 2688 2689 2690 2691
 *	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.
 *
2692 2693 2694 2695 2696 2697
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2698
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2699
{
2700
	u32 sstatus, spd, mask;
2701
	int rc, bit;
2702

2703
	if (!sata_scr_valid(link))
2704 2705 2706
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2707
	 * If not, use cached value in link->sata_spd.
2708
	 */
2709
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2710
	if (rc == 0 && ata_sstatus_online(sstatus))
2711 2712
		spd = (sstatus >> 4) & 0xf;
	else
2713
		spd = link->sata_spd;
2714

2715
	mask = link->sata_spd_limit;
2716 2717
	if (mask <= 1)
		return -EINVAL;
2718 2719

	/* unconditionally mask off the highest bit */
2720 2721
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2722

2723 2724 2725 2726 2727 2728 2729 2730 2731
	/* 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? */
2732 2733 2734
	if (!mask)
		return -EINVAL;

2735 2736 2737 2738 2739 2740 2741 2742 2743
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

2744
	link->sata_spd_limit = mask;
2745

2746 2747
	ata_link_warn(link, "limiting SATA link speed to %s\n",
		      sata_spd_string(fls(mask)));
2748 2749 2750 2751

	return 0;
}

2752
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2753
{
2754 2755
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2756

2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767
	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;
2768
	else
2769
		target = fls(limit);
2770 2771

	spd = (*scontrol >> 4) & 0xf;
2772
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2773

2774
	return spd != target;
2775 2776 2777
}

/**
2778
 *	sata_set_spd_needed - is SATA spd configuration needed
2779
 *	@link: Link in question
2780 2781
 *
 *	Test whether the spd limit in SControl matches
2782
 *	@link->sata_spd_limit.  This function is used to determine
2783 2784 2785 2786 2787 2788 2789 2790 2791
 *	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
2792
static int sata_set_spd_needed(struct ata_link *link)
2793 2794 2795
{
	u32 scontrol;

2796
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2797
		return 1;
2798

2799
	return __sata_set_spd_needed(link, &scontrol);
2800 2801 2802
}

/**
2803
 *	sata_set_spd - set SATA spd according to spd limit
2804
 *	@link: Link to set SATA spd for
2805
 *
2806
 *	Set SATA spd of @link according to sata_spd_limit.
2807 2808 2809 2810 2811 2812
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2813
 *	changed.  Negative errno if SCR registers are inaccessible.
2814
 */
2815
int sata_set_spd(struct ata_link *link)
2816 2817
{
	u32 scontrol;
2818
	int rc;
2819

2820
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2821
		return rc;
2822

2823
	if (!__sata_set_spd_needed(link, &scontrol))
2824 2825
		return 0;

2826
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2827 2828
		return rc;

2829 2830 2831
	return 1;
}

A
Alan Cox 已提交
2832 2833 2834 2835 2836
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2837
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2838
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2839 2840 2841
 * 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
2842 2843 2844
 */

static const struct ata_timing ata_timing[] = {
2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871
/*	{ 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
2872 2873 2874 2875

	{ 0xFF }
};

2876 2877
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2878 2879 2880

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
2881 2882 2883 2884 2885 2886 2887 2888 2889
	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
2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900
}

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);
2901
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
2902 2903 2904 2905
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2906
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2907
{
2908 2909 2910 2911
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2912

2913 2914 2915
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
2916 2917 2918 2919 2920
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
2921
	const u16 *id = adev->id;
A
Alan Cox 已提交
2922 2923 2924 2925
	const struct ata_timing *s;
	struct ata_timing p;

	/*
2926
	 * Find the mode.
2927
	 */
A
Alan Cox 已提交
2928 2929 2930 2931

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

2932 2933
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2934 2935 2936 2937 2938
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

2939
	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
A
Alan Cox 已提交
2940
		memset(&p, 0, sizeof(p));
2941

2942
		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
2943 2944 2945 2946 2947 2948 2949 2950
			if (speed <= XFER_PIO_2)
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
			else if ((speed <= XFER_PIO_4) ||
				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
			p.cycle = id[ATA_ID_EIDE_DMA_MIN];

A
Alan Cox 已提交
2951 2952 2953 2954 2955 2956 2957
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

2958
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2959 2960

	/*
2961 2962 2963
	 * 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
2964 2965
	 */

2966
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2967 2968 2969 2970 2971
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2972
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983
	 */

	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
2984

2985 2986 2987 2988 2989
	/* 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
2990 2991 2992 2993

	return 0;
}

2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044
/**
 *	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;
}

3045 3046 3047
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3048
 *	@sel: ATA_DNXFER_* selector
3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059
 *
 *	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
 */
3060
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3061
{
3062
	char buf[32];
3063 3064
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3065
	int quiet, highbit;
3066

3067 3068
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3069

3070 3071 3072 3073
	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);
3074

3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123
	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));

3124
		ata_dev_warn(dev, "limiting speed to %s\n", buf);
3125
	}
3126 3127 3128 3129 3130 3131 3132

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

	return 0;
}

T
Tejun Heo 已提交
3133
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3134
{
3135
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3136
	struct ata_eh_context *ehc = &dev->link->eh_context;
3137
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3138 3139
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3140
	unsigned int err_mask = 0;
3141
	int rc;
L
Linus Torvalds 已提交
3142

3143
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3144 3145 3146
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3147 3148 3149 3150
	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
		dev_err_whine = " (SET_XFERMODE skipped)";
	else {
		if (nosetxfer)
3151 3152 3153
			ata_dev_warn(dev,
				     "NOSETXFER but PATA detected - can't "
				     "skip SETXFER, might malfunction\n");
3154 3155
		err_mask = ata_dev_set_xfermode(dev);
	}
3156

3157 3158 3159 3160 3161 3162 3163 3164 3165 3166
	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;

3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181
	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;
	}
3182 3183
	/* 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 */
3184
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3185 3186
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3187
		ign_dev_err = 1;
3188

3189 3190 3191
	/* 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
3192

3193 3194 3195 3196 3197 3198
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3199

3200 3201
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3202

3203 3204 3205
	ata_dev_info(dev, "configured for %s%s\n",
		     ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		     dev_err_whine);
3206

3207
	return 0;
3208 3209

 fail:
3210
	ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3211
	return -EIO;
L
Linus Torvalds 已提交
3212 3213 3214
}

/**
3215
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3216
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3217
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3218
 *
3219 3220 3221
 *	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
3222
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3223
 *
L
Linus Torvalds 已提交
3224
 *	LOCKING:
J
Jeff Garzik 已提交
3225
 *	PCI/etc. bus probe sem.
3226 3227 3228
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3229
 */
3230

3231
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3232
{
3233
	struct ata_port *ap = link->ap;
3234
	struct ata_device *dev;
3235
	int rc = 0, used_dma = 0, found = 0;
3236

3237
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3238
	ata_for_each_dev(dev, link, ENABLED) {
3239
		unsigned long pio_mask, dma_mask;
3240
		unsigned int mode_mask;
3241

3242 3243 3244 3245 3246 3247
		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
3248
		ata_dev_xfermask(dev);
3249
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3250

3251
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3252 3253

		if (libata_dma_mask & mode_mask)
3254 3255
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
						     dev->udma_mask);
3256 3257 3258
		else
			dma_mask = 0;

3259 3260
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3261

3262
		found = 1;
3263
		if (ata_dma_enabled(dev))
3264
			used_dma = 1;
3265
	}
3266
	if (!found)
3267
		goto out;
3268 3269

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3270
	ata_for_each_dev(dev, link, ENABLED) {
3271
		if (dev->pio_mode == 0xff) {
3272
			ata_dev_warn(dev, "no PIO support\n");
3273
			rc = -EINVAL;
3274
			goto out;
3275 3276 3277 3278 3279 3280 3281
		}

		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
3282

3283
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3284 3285
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3286 3287 3288 3289 3290 3291 3292
			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
3293 3294

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3295
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3296
		rc = ata_dev_set_mode(dev);
3297
		if (rc)
3298
			goto out;
3299
	}
L
Linus Torvalds 已提交
3300

3301 3302
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3303
	 */
J
Jeff Garzik 已提交
3304
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3305
		ap->host->simplex_claimed = ap;
3306

3307 3308 3309 3310
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3311 3312
}

3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
/**
 *	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;
3337
	unsigned long nodev_deadline;
3338 3339
	int warned = 0;

3340 3341 3342 3343 3344 3345
	/* choose which 0xff timeout to use, read comment in libata.h */
	if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
	else
		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);

T
Tejun Heo 已提交
3346 3347 3348 3349 3350 3351
	/* 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);

3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362
	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;

3363 3364
		/*
		 * -ENODEV could be transient.  Ignore -ENODEV if link
3365
		 * is online.  Also, some SATA devices take a long
3366 3367 3368
		 * time to clear 0xff after reset.  Wait for
		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
		 * offline.
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389
		 *
		 * 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)) {
3390
			ata_link_warn(link,
3391 3392 3393 3394 3395
				"link is slow to respond, please be patient "
				"(ready=%d)\n", tmp);
			warned = 1;
		}

3396
		ata_msleep(link->ap, 50);
3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413
	}
}

/**
 *	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.
 */
3414
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3415 3416
				int (*check_ready)(struct ata_link *link))
{
3417
	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3418 3419 3420 3421

	return ata_wait_ready(link, deadline, check_ready);
}

3422
/**
3423 3424
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3425
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3426
 *	@deadline: deadline jiffies for the operation
3427
 *
3428
 *	Make sure SStatus of @link reaches stable state, determined by
3429 3430
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3431 3432
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3433 3434
 *	until timeout then returns 0 if DET is stable at 1.
 *
3435 3436 3437
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3438 3439 3440 3441 3442 3443
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3444 3445
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3446
{
3447 3448
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3449
	unsigned long last_jiffies, t;
3450 3451 3452
	u32 last, cur;
	int rc;

3453
	t = ata_deadline(jiffies, params[2]);
3454 3455 3456
	if (time_before(t, deadline))
		deadline = t;

3457
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3458 3459 3460 3461 3462 3463 3464
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3465
		ata_msleep(link->ap, interval);
3466
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3467 3468 3469 3470 3471
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3472
			if (cur == 1 && time_before(jiffies, deadline))
3473
				continue;
3474 3475
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3476 3477 3478 3479 3480 3481 3482 3483
				return 0;
			continue;
		}

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

3484 3485 3486
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3487
		if (time_after(jiffies, deadline))
3488
			return -EPIPE;
3489 3490 3491 3492
	}
}

/**
3493 3494
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3495
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3496
 *	@deadline: deadline jiffies for the operation
3497
 *
3498
 *	Resume SATA phy @link and debounce it.
3499 3500 3501 3502 3503 3504 3505
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3506 3507
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3508
{
3509
	int tries = ATA_LINK_RESUME_TRIES;
3510
	u32 scontrol, serror;
3511 3512
	int rc;

3513
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3514
		return rc;
3515

3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529
	/*
	 * Writes to SControl sometimes get ignored under certain
	 * controllers (ata_piix SIDPR).  Make sure DET actually is
	 * cleared.
	 */
	do {
		scontrol = (scontrol & 0x0f0) | 0x300;
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
			return rc;
		/*
		 * Some PHYs react badly if SStatus is pounded
		 * immediately after resuming.  Delay 200ms before
		 * debouncing.
		 */
3530
		ata_msleep(link->ap, 200);
3531

3532 3533 3534 3535
		/* is SControl restored correctly? */
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
			return rc;
	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3536

3537
	if ((scontrol & 0xf0f) != 0x300) {
3538
		ata_link_warn(link, "failed to resume link (SControl %X)\n",
3539
			     scontrol);
3540 3541 3542 3543
		return 0;
	}

	if (tries < ATA_LINK_RESUME_TRIES)
3544 3545
		ata_link_warn(link, "link resume succeeded after %d retries\n",
			      ATA_LINK_RESUME_TRIES - tries);
3546

3547 3548 3549
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3550
	/* clear SError, some PHYs require this even for SRST to work */
3551 3552 3553
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3554
	return rc != -EINVAL ? rc : 0;
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 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602
/**
 *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
 *	@link: ATA link to manipulate SControl for
 *	@policy: LPM policy to configure
 *	@spm_wakeup: initiate LPM transition to active state
 *
 *	Manipulate the IPM field of the SControl register of @link
 *	according to @policy.  If @policy is ATA_LPM_MAX_POWER and
 *	@spm_wakeup is %true, the SPM field is manipulated to wake up
 *	the link.  This function also clears PHYRDY_CHG before
 *	returning.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 on succes, -errno otherwise.
 */
int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
		      bool spm_wakeup)
{
	struct ata_eh_context *ehc = &link->eh_context;
	bool woken_up = false;
	u32 scontrol;
	int rc;

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

	switch (policy) {
	case ATA_LPM_MAX_POWER:
		/* disable all LPM transitions */
		scontrol |= (0x3 << 8);
		/* initiate transition to active state */
		if (spm_wakeup) {
			scontrol |= (0x4 << 12);
			woken_up = true;
		}
		break;
	case ATA_LPM_MED_POWER:
		/* allow LPM to PARTIAL */
		scontrol &= ~(0x1 << 8);
		scontrol |= (0x2 << 8);
		break;
	case ATA_LPM_MIN_POWER:
3603 3604 3605 3606 3607 3608 3609 3610
		if (ata_link_nr_enabled(link) > 0)
			/* no restrictions on LPM transitions */
			scontrol &= ~(0x3 << 8);
		else {
			/* empty port, power off */
			scontrol &= ~0xf;
			scontrol |= (0x1 << 2);
		}
3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628
		break;
	default:
		WARN_ON(1);
	}

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

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

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

3629
/**
3630
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3631
 *	@link: ATA link to be reset
3632
 *	@deadline: deadline jiffies for the operation
3633
 *
T
Tejun Heo 已提交
3634
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3635 3636 3637 3638
 *	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.
3639 3640 3641 3642 3643 3644 3645
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3646
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3647
{
T
Tejun Heo 已提交
3648
	struct ata_port *ap = link->ap;
3649
	struct ata_eh_context *ehc = &link->eh_context;
3650
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3651 3652 3653 3654 3655 3656
	int rc;

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

3657
	/* if SATA, resume link */
3658
	if (ap->flags & ATA_FLAG_SATA) {
3659
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3660 3661
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3662 3663 3664
			ata_link_warn(link,
				      "failed to resume link for reset (errno=%d)\n",
				      rc);
3665 3666
	}

3667
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3668
	if (ata_phys_link_offline(link))
3669 3670
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3671 3672 3673
	return 0;
}

3674
/**
T
Tejun Heo 已提交
3675 3676 3677
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3678
 *	@deadline: deadline jiffies for the operation
3679 3680
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3681
 *
T
Tejun Heo 已提交
3682
 *	SATA phy-reset @link using DET bits of SControl register.
3683 3684 3685 3686 3687 3688 3689 3690
 *	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.
3691 3692 3693 3694 3695 3696 3697
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3698
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3699 3700
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3701
{
T
Tejun Heo 已提交
3702
	u32 scontrol;
3703
	int rc;
3704

3705 3706
	DPRINTK("ENTER\n");

3707 3708 3709
	if (online)
		*online = false;

3710
	if (sata_set_spd_needed(link)) {
3711 3712 3713 3714 3715
		/* 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.
		 */
3716
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3717
			goto out;
3718

3719
		scontrol = (scontrol & 0x0f0) | 0x304;
3720

3721
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3722
			goto out;
3723

3724
		sata_set_spd(link);
3725 3726 3727
	}

	/* issue phy wake/reset */
3728
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3729
		goto out;
3730

3731
	scontrol = (scontrol & 0x0f0) | 0x301;
3732

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

3736
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3737 3738
	 * 10.4.2 says at least 1 ms.
	 */
3739
	ata_msleep(link->ap, 1);
3740

3741 3742
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3743 3744 3745
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3746
	if (ata_phys_link_offline(link))
3747 3748 3749 3750 3751 3752
		goto out;

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

T
Tejun Heo 已提交
3753
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3754 3755 3756 3757 3758 3759 3760 3761
		/* 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;

3762 3763
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774
			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);
3775
 out:
3776 3777 3778 3779
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3780
		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
3781
	}
3782 3783 3784 3785
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811
/**
 *	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;
}

3812
/**
3813
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3814
 *	@link: the target ata_link
3815 3816 3817 3818 3819 3820 3821 3822 3823
 *	@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)
 */
3824
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3825
{
3826 3827
	u32 serror;

3828 3829
	DPRINTK("ENTER\n");

3830 3831 3832 3833
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3834
	/* print link status */
3835
	sata_print_link_status(link);
3836 3837 3838 3839

	DPRINTK("EXIT\n");
}

3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855
/**
 *	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
3856 3857
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3858 3859
{
	const u16 *old_id = dev->id;
3860 3861
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3862 3863

	if (dev->class != new_class) {
3864 3865
		ata_dev_info(dev, "class mismatch %d != %d\n",
			     dev->class, new_class);
3866 3867 3868
		return 0;
	}

3869 3870 3871 3872
	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]));
3873 3874

	if (strcmp(model[0], model[1])) {
3875 3876
		ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
			     model[0], model[1]);
3877 3878 3879 3880
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3881 3882
		ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
			     serial[0], serial[1]);
3883 3884 3885 3886 3887 3888 3889
		return 0;
	}

	return 1;
}

/**
3890
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3891
 *	@dev: target ATA device
3892
 *	@readid_flags: read ID flags
3893 3894 3895 3896 3897 3898 3899 3900 3901 3902
 *
 *	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
 */
3903
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3904
{
3905
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3906
	u16 *id = (void *)dev->link->ap->sector_buf;
3907 3908
	int rc;

3909
	/* read ID data */
3910
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3911
	if (rc)
3912
		return rc;
3913 3914

	/* is the device still there? */
3915 3916
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3917

3918
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3919 3920 3921 3922 3923 3924
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3925
 *	@new_class: new class code
3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936
 *	@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
 */
3937 3938
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3939
{
3940
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
3941
	u64 n_native_sectors = dev->n_native_sectors;
3942 3943 3944 3945 3946
	int rc;

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

3947 3948
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
3949 3950 3951
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
3952 3953
		ata_dev_info(dev, "class mismatch %u != %u\n",
			     dev->class, new_class);
3954 3955 3956 3957
		rc = -ENODEV;
		goto fail;
	}

3958 3959 3960 3961
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3962 3963

	/* configure device according to the new ID */
3964
	rc = ata_dev_configure(dev);
3965 3966 3967 3968
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
T
Tejun Heo 已提交
3969 3970 3971 3972 3973
	if (dev->class != ATA_DEV_ATA || !n_sectors ||
	    dev->n_sectors == n_sectors)
		return 0;

	/* n_sectors has changed */
3974 3975 3976
	ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
		     (unsigned long long)n_sectors,
		     (unsigned long long)dev->n_sectors);
T
Tejun Heo 已提交
3977 3978 3979 3980 3981 3982 3983 3984

	/*
	 * Something could have caused HPA to be unlocked
	 * involuntarily.  If n_native_sectors hasn't changed and the
	 * new size matches it, keep the device.
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
3985 3986 3987
		ata_dev_warn(dev,
			     "new n_sectors matches native, probably "
			     "late HPA unlock, n_sectors updated\n");
3988
		/* use the larger n_sectors */
T
Tejun Heo 已提交
3989
		return 0;
3990 3991
	}

T
Tejun Heo 已提交
3992 3993 3994 3995 3996 3997 3998 3999 4000
	/*
	 * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
	 * unlocking HPA in those cases.
	 *
	 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
	    !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
4001 4002 4003
		ata_dev_warn(dev,
			     "old n_sectors matches native, probably "
			     "late HPA lock, will try to unlock HPA\n");
T
Tejun Heo 已提交
4004 4005 4006 4007 4008
		/* try unlocking HPA */
		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
		rc = -EIO;
	} else
		rc = -ENODEV;
4009

T
Tejun Heo 已提交
4010 4011 4012
	/* restore original n_[native_]sectors and fail */
	dev->n_native_sectors = n_native_sectors;
	dev->n_sectors = n_sectors;
4013
 fail:
4014
	ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4015 4016 4017
	return rc;
}

4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034
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 },
4035
	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
4036 4037 4038 4039 4040
	{ "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 },
4041
	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
4042 4043 4044 4045 4046 4047 4048 4049 4050 4051
	{ "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 },
4052
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4053
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4054
	/* Odd clown on sil3726/4726 PMPs */
4055
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4056

4057
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4058
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4059
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4060

4061 4062 4063 4064
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4065
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4066
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4067 4068
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4069
	/* NCQ is broken */
4070
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4071
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4072
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4073
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4074
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4075

4076
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4077
	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4078
						ATA_HORKAGE_FIRMWARE_WARN },
4079

4080
	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4081 4082
						ATA_HORKAGE_FIRMWARE_WARN },

4083
	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4084 4085
						ATA_HORKAGE_FIRMWARE_WARN },

4086
	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4087 4088
						ATA_HORKAGE_FIRMWARE_WARN },

4089 4090 4091 4092 4093
	/* 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, },
4094

4095 4096 4097
	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },

4098 4099 4100 4101 4102
	/* 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 },
4103

T
Tejun Heo 已提交
4104 4105 4106
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4107 4108 4109
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4110
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4111

A
Alan Cox 已提交
4112 4113
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4114
	/* Maybe we should just blacklist TSSTcorp... */
4115
	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4116

4117 4118 4119
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4120 4121 4122
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },

4123 4124 4125 4126
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
4127 4128 4129
	{ "PIONEER DVD-RW  DVRTD08",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
4130

4131 4132
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4133
};
4134

4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146
/**
 *	glob_match - match a text string against a glob-style pattern
 *	@text: the string to be examined
 *	@pattern: the glob-style pattern to be matched against
 *
 *	Either/both of text and pattern can be empty strings.
 *
 *	Match text against a glob-style pattern, with wildcards and simple sets:
 *
 *		?	matches any single character.
 *		*	matches any run of characters.
 *		[xyz]	matches a single character from the set: x, y, or z.
4147 4148
 *		[a-d]	matches a single character from the range: a, b, c, or d.
 *		[a-d0-9] matches a single character from either range.
4149
 *
4150 4151
 *	The special characters ?, [, -, or *, can be matched using a set, eg. [*]
 *	Behaviour with malformed patterns is undefined, though generally reasonable.
4152
 *
4153
 *	Sample patterns:  "SD1?",  "SD1[0-5]",  "*R0",  "SD*1?[012]*xx"
4154 4155 4156 4157 4158 4159 4160 4161 4162
 *
 *	This function uses one level of recursion per '*' in pattern.
 *	Since it calls _nothing_ else, and has _no_ explicit local variables,
 *	this will not cause stack problems for any reasonable use here.
 *
 *	RETURNS:
 *	0 on match, 1 otherwise.
 */
static int glob_match (const char *text, const char *pattern)
4163
{
4164 4165 4166 4167 4168 4169 4170 4171 4172
	do {
		/* Match single character or a '?' wildcard */
		if (*text == *pattern || *pattern == '?') {
			if (!*pattern++)
				return 0;  /* End of both strings: match */
		} else {
			/* Match single char against a '[' bracketed ']' pattern set */
			if (!*text || *pattern != '[')
				break;  /* Not a pattern set */
4173 4174 4175 4176 4177 4178 4179
			while (*++pattern && *pattern != ']' && *text != *pattern) {
				if (*pattern == '-' && *(pattern - 1) != '[')
					if (*text > *(pattern - 1) && *text < *(pattern + 1)) {
						++pattern;
						break;
					}
			}
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194
			if (!*pattern || *pattern == ']')
				return 1;  /* No match */
			while (*pattern && *pattern++ != ']');
		}
	} while (*++text && *pattern);

	/* Match any run of chars against a '*' wildcard */
	if (*pattern == '*') {
		if (!*++pattern)
			return 0;  /* Match: avoid recursion at end of pattern */
		/* Loop to handle additional pattern chars after the wildcard */
		while (*text) {
			if (glob_match(text, pattern) == 0)
				return 0;  /* Remainder matched */
			++text;  /* Absorb (match) this char and try again */
4195 4196
		}
	}
4197 4198 4199
	if (!*text && !*pattern)
		return 0;  /* End of both strings: match */
	return 1;  /* No match */
4200
}
4201

T
Tejun Heo 已提交
4202
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4203
{
T
Tejun Heo 已提交
4204 4205
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4206
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4207

T
Tejun Heo 已提交
4208 4209
	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
4210

4211
	while (ad->model_num) {
4212
		if (!glob_match(model_num, ad->model_num)) {
4213 4214
			if (ad->model_rev == NULL)
				return ad->horkage;
4215
			if (!glob_match(model_rev, ad->model_rev))
4216
				return ad->horkage;
4217
		}
4218
		ad++;
4219
	}
L
Linus Torvalds 已提交
4220 4221 4222
	return 0;
}

4223 4224 4225 4226 4227 4228
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
4229
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4230 4231
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4232
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4233 4234
}

A
Alan Cox 已提交
4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249
/**
 *	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);
}

4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267
/**
 *	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
4268
	/* If the controller thinks we are 40 wire, we are. */
4269 4270
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4271 4272

	/* If the controller thinks we are 80 wire, we are. */
4273 4274
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4275 4276 4277 4278 4279

	/* 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
4280 4281
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4282 4283 4284 4285 4286 4287 4288 4289 4290 4291

	/* 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
4292 4293 4294
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4295 4296 4297 4298 4299 4300
				return 0;
		}
	}
	return 1;
}

4301 4302 4303 4304
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4305 4306 4307 4308
 *	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...
4309 4310 4311 4312
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4313
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4314
{
T
Tejun Heo 已提交
4315 4316
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4317
	struct ata_host *host = ap->host;
4318
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4319

4320
	/* controller modes available */
4321 4322 4323
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4324
	/* drive modes available */
4325 4326 4327
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4328

4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339
	/*
	 *	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));
	}

4340 4341
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4342 4343
		ata_dev_warn(dev,
			     "device is on DMA blacklist, disabling DMA\n");
4344
	}
4345

4346
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4347
	    host->simplex_claimed && host->simplex_claimed != ap) {
4348
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4349 4350
		ata_dev_warn(dev,
			     "simplex DMA is claimed by other device, disabling DMA\n");
4351
	}
4352

J
Jeff Garzik 已提交
4353 4354 4355
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4356
	if (ap->ops->mode_filter)
4357
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4358

4359 4360 4361 4362 4363 4364 4365 4366 4367 4368
	/* 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 */
4369
		if (cable_is_40wire(ap)) {
4370 4371
			ata_dev_warn(dev,
				     "limited to UDMA/33 due to 40-wire cable\n");
4372 4373 4374
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4375 4376
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4377 4378 4379 4380 4381 4382
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4383 4384 4385
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4386
 *	LOCKING:
J
Jeff Garzik 已提交
4387
 *	PCI/etc. bus probe sem.
4388 4389 4390
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4391 4392
 */

T
Tejun Heo 已提交
4393
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4394
{
4395
	struct ata_taskfile tf;
4396
	unsigned int err_mask;
L
Linus Torvalds 已提交
4397 4398 4399 4400

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

T
Tejun Heo 已提交
4401 4402 4403
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4404
	ata_tf_init(dev, &tf);
4405 4406
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4407
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4408
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4409
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4410 4411
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4412 4413
	/* 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
4414
		tf.nsect = 0x01;
A
Alan Cox 已提交
4415 4416
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4417

4418
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4419 4420 4421 4422

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
4423

4424
/**
4425
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4426 4427
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4428
 *	@feature: The sector count represents the feature to set
4429 4430
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4431
 *	on port @ap with sector count
4432 4433 4434 4435 4436 4437 4438
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4439
unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451
{
	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;
4452
	tf.nsect = feature;
4453

4454
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4455

4456 4457
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4458 4459
}

4460 4461 4462
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4463 4464
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4465 4466
 *
 *	LOCKING:
4467 4468 4469 4470
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4471
 */
T
Tejun Heo 已提交
4472 4473
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4474
{
4475
	struct ata_taskfile tf;
4476
	unsigned int err_mask;
4477 4478 4479

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4480
		return AC_ERR_INVALID;
4481 4482 4483 4484

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

T
Tejun Heo 已提交
4485
	ata_tf_init(dev, &tf);
4486 4487 4488 4489 4490
	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 */
4491

4492
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4493 4494 4495 4496 4497
	/* 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;
4498

4499 4500
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4501 4502
}

L
Linus Torvalds 已提交
4503
/**
J
Jeff Garzik 已提交
4504 4505 4506 4507
 *	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
4508 4509
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4510
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4511
 */
4512
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4513 4514
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4515
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4516 4517
	int dir = qc->dma_dir;

4518
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4519

4520
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4521

4522
	if (qc->n_elem)
4523
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4524 4525

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4526
	qc->sg = NULL;
L
Linus Torvalds 已提交
4527 4528 4529
}

/**
4530
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4531 4532
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4533 4534 4535 4536
 *	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
4537
 *	LOCKING:
T
Tejun Heo 已提交
4538 4539 4540 4541 4542
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4543
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4544 4545
{
	struct ata_port *ap = qc->ap;
4546

T
Tejun Heo 已提交
4547 4548 4549
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4550 4551
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4552
		return 1;
4553

T
Tejun Heo 已提交
4554 4555
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4556

T
Tejun Heo 已提交
4557 4558
	return 0;
}
L
Linus Torvalds 已提交
4559

T
Tejun Heo 已提交
4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577
/**
 *	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;
4578

T
Tejun Heo 已提交
4579 4580 4581 4582 4583 4584 4585
	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;
	}
4586

T
Tejun Heo 已提交
4587 4588
	return ATA_DEFER_LINK;
}
4589

T
Tejun Heo 已提交
4590
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4591

T
Tejun Heo 已提交
4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611
/**
 *	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;
}
4612

T
Tejun Heo 已提交
4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629
/**
 *	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
4630

T
Tejun Heo 已提交
4631
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4632

T
Tejun Heo 已提交
4633 4634 4635
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4636

T
Tejun Heo 已提交
4637
	DPRINTK("%d sg elements mapped\n", n_elem);
4638
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4639 4640
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4641

T
Tejun Heo 已提交
4642
	return 0;
L
Linus Torvalds 已提交
4643 4644
}

T
Tejun Heo 已提交
4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657
/**
 *	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)
4658
{
T
Tejun Heo 已提交
4659 4660
#ifdef __BIG_ENDIAN
	unsigned int i;
4661

T
Tejun Heo 已提交
4662 4663 4664
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4665 4666
}

4667 4668
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4669
 *	@ap: target port
4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696
 *
 *	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
4697 4698 4699 4700 4701
/**
 *	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
4702
 *	None.
L
Linus Torvalds 已提交
4703 4704
 */

4705
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4706
{
T
Tejun Heo 已提交
4707
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4708 4709
	struct ata_queued_cmd *qc;

4710
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4711 4712 4713 4714 4715
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4716
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4717 4718 4719 4720 4721
	}

	return qc;
}

4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733
/**
 *	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)
{
4734
	struct ata_port *ap;
4735 4736
	unsigned int tag;

4737
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4738
	ap = qc->ap;
4739 4740 4741 4742 4743 4744 4745 4746 4747

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

4748
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4749
{
4750 4751
	struct ata_port *ap;
	struct ata_link *link;
4752

4753 4754
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4755 4756
	ap = qc->ap;
	link = qc->dev->link;
L
Linus Torvalds 已提交
4757 4758 4759 4760

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

4761
	/* command should be marked inactive atomically with qc completion */
4762
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4763
		link->sactive &= ~(1 << qc->tag);
4764 4765 4766
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4767
		link->active_tag = ATA_TAG_POISON;
4768 4769 4770 4771 4772 4773 4774
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4775

4776 4777 4778 4779 4780
	/* 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;
4781
	ap->qc_active &= ~(1 << qc->tag);
4782

L
Linus Torvalds 已提交
4783
	/* call completion callback */
4784
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4785 4786
}

4787 4788 4789 4790 4791
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4792
	ap->ops->qc_fill_rtf(qc);
4793 4794
}

4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

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

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

	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}

4808 4809 4810 4811
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
4812 4813 4814 4815 4816 4817 4818
 *	Indicate to the mid and upper layers that an ATA command has
 *	completed, with either an ok or not-ok status.
 *
 *	Refrain from calling this function multiple times when
 *	successfully completing multiple NCQ commands.
 *	ata_qc_complete_multiple() should be used instead, which will
 *	properly update IRQ expect state.
4819 4820
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4821
 *	spin_lock_irqsave(host lock)
4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840
 */
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) {
4841 4842 4843
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4844 4845 4846
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

4847 4848 4849 4850 4851
		/*
		 * Finish internal commands without any further processing
		 * and always with the result TF filled.
		 */
		if (unlikely(ata_tag_internal(qc->tag))) {
4852
			fill_result_tf(qc);
4853 4854 4855
			__ata_qc_complete(qc);
			return;
		}
4856

4857 4858 4859 4860 4861 4862 4863
		/*
		 * Non-internal qc has failed.  Fill the result TF and
		 * summon EH.
		 */
		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			fill_result_tf(qc);
			ata_qc_schedule_eh(qc);
4864
			return;
4865 4866
		}

4867 4868
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

4869 4870
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4871
			fill_result_tf(qc);
4872

4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887
		/* 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;
4888 4889 4890 4891

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4892 4893
		}

4894 4895 4896
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4897 4898 4899 4900 4901 4902 4903
		__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)
4904
			fill_result_tf(qc);
4905 4906 4907 4908 4909

		__ata_qc_complete(qc);
	}
}

4910 4911 4912 4913 4914 4915 4916 4917 4918 4919
/**
 *	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.
 *
4920 4921 4922 4923
 *	Always use this function when completing multiple NCQ commands
 *	from IRQ handlers instead of calling ata_qc_complete()
 *	multiple times to keep IRQ expect status properly in sync.
 *
4924
 *	LOCKING:
J
Jeff Garzik 已提交
4925
 *	spin_lock_irqsave(host lock)
4926 4927 4928 4929
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4930
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4931 4932 4933 4934 4935 4936 4937
{
	int nr_done = 0;
	u32 done_mask;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
4938 4939
		ata_port_err(ap, "illegal qc_active transition (%08x->%08x)\n",
			     ap->qc_active, qc_active);
4940 4941 4942
		return -EINVAL;
	}

4943
	while (done_mask) {
4944
		struct ata_queued_cmd *qc;
4945
		unsigned int tag = __ffs(done_mask);
4946

4947 4948
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
4949 4950 4951
			ata_qc_complete(qc);
			nr_done++;
		}
4952
		done_mask &= ~(1 << tag);
4953 4954 4955 4956 4957
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4958 4959 4960 4961 4962 4963 4964 4965 4966 4967
/**
 *	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
4968
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4969
 */
4970
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4971 4972
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4973
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
4974
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
4975

4976 4977 4978 4979
	/* 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.
	 */
4980
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4981

4982
	if (ata_is_ncq(prot)) {
4983
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
4984 4985 4986

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
4987
		link->sactive |= 1 << qc->tag;
4988
	} else {
4989
		WARN_ON_ONCE(link->sactive);
4990 4991

		ap->nr_active_links++;
T
Tejun Heo 已提交
4992
		link->active_tag = qc->tag;
4993 4994
	}

4995
	qc->flags |= ATA_QCFLAG_ACTIVE;
4996
	ap->qc_active |= 1 << qc->tag;
4997

4998 4999
	/*
	 * We guarantee to LLDs that they will have at least one
5000 5001
	 * non-zero sg if the command is a data command.
	 */
5002 5003 5004
	if (WARN_ON_ONCE(ata_is_data(prot) &&
			 (!qc->sg || !qc->n_elem || !qc->nbytes)))
		goto sys_err;
5005

T
Tejun Heo 已提交
5006
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5007
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5008
		if (ata_sg_setup(qc))
5009
			goto sys_err;
L
Linus Torvalds 已提交
5010

T
Tejun Heo 已提交
5011
	/* if device is sleeping, schedule reset and abort the link */
5012
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5013
		link->eh_info.action |= ATA_EH_RESET;
5014 5015 5016 5017 5018
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5019 5020
	ap->ops->qc_prep(qc);

5021 5022 5023 5024
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5025

5026
sys_err:
5027 5028 5029
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5030 5031
}

5032 5033
/**
 *	sata_scr_valid - test whether SCRs are accessible
5034
 *	@link: ATA link to test SCR accessibility for
5035
 *
5036
 *	Test whether SCRs are accessible for @link.
5037 5038 5039 5040 5041 5042 5043
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5044
int sata_scr_valid(struct ata_link *link)
5045
{
5046 5047
	struct ata_port *ap = link->ap;

5048
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5049 5050 5051 5052
}

/**
 *	sata_scr_read - read SCR register of the specified port
5053
 *	@link: ATA link to read SCR for
5054 5055 5056
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5057
 *	Read SCR register @reg of @link into *@val.  This function is
5058 5059
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5060 5061
 *
 *	LOCKING:
5062
 *	None if @link is ap->link.  Kernel thread context otherwise.
5063 5064 5065 5066
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5067
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5068
{
5069 5070
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5071
			return link->ap->ops->scr_read(link, reg, val);
5072 5073 5074 5075
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5076 5077 5078 5079
}

/**
 *	sata_scr_write - write SCR register of the specified port
5080
 *	@link: ATA link to write SCR for
5081 5082 5083
 *	@reg: SCR to write
 *	@val: value to write
 *
5084
 *	Write @val to SCR register @reg of @link.  This function is
5085 5086
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5087 5088
 *
 *	LOCKING:
5089
 *	None if @link is ap->link.  Kernel thread context otherwise.
5090 5091 5092 5093
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5094
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5095
{
5096 5097
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5098
			return link->ap->ops->scr_write(link, reg, val);
5099 5100
		return -EOPNOTSUPP;
	}
5101

5102
	return sata_pmp_scr_write(link, reg, val);
5103 5104 5105 5106
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5107
 *	@link: ATA link to write SCR for
5108 5109 5110 5111 5112 5113 5114
 *	@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:
5115
 *	None if @link is ap->link.  Kernel thread context otherwise.
5116 5117 5118 5119
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5120
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5121
{
5122 5123
	if (ata_is_host_link(link)) {
		int rc;
5124

5125
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5126
			rc = link->ap->ops->scr_write(link, reg, val);
5127
			if (rc == 0)
T
Tejun Heo 已提交
5128
				rc = link->ap->ops->scr_read(link, reg, &val);
5129 5130 5131
			return rc;
		}
		return -EOPNOTSUPP;
5132
	}
5133 5134

	return sata_pmp_scr_write(link, reg, val);
5135 5136 5137
}

/**
T
Tejun Heo 已提交
5138
 *	ata_phys_link_online - test whether the given link is online
5139
 *	@link: ATA link to test
5140
 *
5141 5142 5143
 *	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).
5144 5145 5146 5147 5148
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5149
 *	True if the port online status is available and online.
5150
 */
T
Tejun Heo 已提交
5151
bool ata_phys_link_online(struct ata_link *link)
5152 5153 5154
{
	u32 sstatus;

5155
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5156
	    ata_sstatus_online(sstatus))
5157 5158
		return true;
	return false;
5159 5160 5161
}

/**
T
Tejun Heo 已提交
5162
 *	ata_phys_link_offline - test whether the given link is offline
5163
 *	@link: ATA link to test
5164
 *
5165 5166 5167
 *	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).
5168 5169 5170 5171 5172
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5173
 *	True if the port offline status is available and offline.
5174
 */
T
Tejun Heo 已提交
5175
bool ata_phys_link_offline(struct ata_link *link)
5176 5177 5178
{
	u32 sstatus;

5179
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5180
	    !ata_sstatus_online(sstatus))
5181 5182
		return true;
	return false;
5183
}
E
Edward Falk 已提交
5184

T
Tejun Heo 已提交
5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236
/**
 *	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));
}

5237
#ifdef CONFIG_PM
L
Lin Ming 已提交
5238
static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
J
Jeff Garzik 已提交
5239 5240
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5241
{
L
Lin Ming 已提交
5242
	struct ata_link *link;
5243
	unsigned long flags;
L
Lin Ming 已提交
5244
	int rc;
5245

L
Lin Ming 已提交
5246 5247 5248 5249 5250 5251 5252
	/* 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);
	}
5253

L
Lin Ming 已提交
5254 5255
	/* request PM ops to EH */
	spin_lock_irqsave(ap->lock, flags);
5256

L
Lin Ming 已提交
5257 5258 5259 5260 5261
	ap->pm_mesg = mesg;
	if (wait) {
		rc = 0;
		ap->pm_result = &rc;
	}
5262

L
Lin Ming 已提交
5263 5264 5265 5266 5267
	ap->pflags |= ATA_PFLAG_PM_PENDING;
	ata_for_each_link(link, ap, HOST_FIRST) {
		link->eh_info.action |= action;
		link->eh_info.flags |= ehi_flags;
	}
5268

L
Lin Ming 已提交
5269
	ata_port_schedule_eh(ap);
5270

L
Lin Ming 已提交
5271
	spin_unlock_irqrestore(ap->lock, flags);
5272

L
Lin Ming 已提交
5273 5274 5275 5276
	/* wait and check result */
	if (wait) {
		ata_port_wait_eh(ap);
		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5277 5278
	}

L
Lin Ming 已提交
5279
	return rc;
5280 5281
}

L
Lin Ming 已提交
5282 5283
#define to_ata_port(d) container_of(d, struct ata_port, tdev)

L
Lin Ming 已提交
5284
static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
L
Lin Ming 已提交
5285 5286
{
	struct ata_port *ap = to_ata_port(dev);
L
Lin Ming 已提交
5287
	unsigned int ehi_flags = ATA_EHI_QUIET;
L
Lin Ming 已提交
5288 5289
	int rc;

L
Lin Ming 已提交
5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301
	/*
	 * On some hardware, device fails to respond after spun down
	 * for suspend.  As the device won't be used before being
	 * resumed, we don't need to touch the device.  Ask EH to skip
	 * the usual stuff and proceed directly to suspend.
	 *
	 * http://thread.gmane.org/gmane.linux.ide/46764
	 */
	if (mesg.event == PM_EVENT_SUSPEND)
		ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;

	rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, 1);
L
Lin Ming 已提交
5302 5303 5304 5305 5306 5307 5308 5309
	return rc;
}

static int ata_port_suspend(struct device *dev)
{
	if (pm_runtime_suspended(dev))
		return 0;

L
Lin Ming 已提交
5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326
	return ata_port_suspend_common(dev, PMSG_SUSPEND);
}

static int ata_port_do_freeze(struct device *dev)
{
	if (pm_runtime_suspended(dev))
		pm_runtime_resume(dev);

	return ata_port_suspend_common(dev, PMSG_FREEZE);
}

static int ata_port_poweroff(struct device *dev)
{
	if (pm_runtime_suspended(dev))
		return 0;

	return ata_port_suspend_common(dev, PMSG_HIBERNATE);
L
Lin Ming 已提交
5327 5328
}

5329
static int ata_port_resume_common(struct device *dev)
L
Lin Ming 已提交
5330 5331 5332 5333 5334 5335 5336 5337 5338
{
	struct ata_port *ap = to_ata_port(dev);
	int rc;

	rc = ata_port_request_pm(ap, PMSG_ON, ATA_EH_RESET,
		ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 1);
	return rc;
}

5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352
static int ata_port_resume(struct device *dev)
{
	int rc;

	rc = ata_port_resume_common(dev);
	if (!rc) {
		pm_runtime_disable(dev);
		pm_runtime_set_active(dev);
		pm_runtime_enable(dev);
	}

	return rc;
}

5353 5354 5355 5356 5357
static int ata_port_runtime_idle(struct device *dev)
{
	return pm_runtime_suspend(dev);
}

L
Lin Ming 已提交
5358 5359 5360
static const struct dev_pm_ops ata_port_pm_ops = {
	.suspend = ata_port_suspend,
	.resume = ata_port_resume,
L
Lin Ming 已提交
5361 5362 5363 5364
	.freeze = ata_port_do_freeze,
	.thaw = ata_port_resume,
	.poweroff = ata_port_poweroff,
	.restore = ata_port_resume,
5365

L
Lin Ming 已提交
5366
	.runtime_suspend = ata_port_suspend,
5367
	.runtime_resume = ata_port_resume_common,
5368
	.runtime_idle = ata_port_runtime_idle,
L
Lin Ming 已提交
5369 5370
};

5371
/**
J
Jeff Garzik 已提交
5372 5373
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5374 5375
 *	@mesg: PM message
 *
L
Lin Ming 已提交
5376
 *	Suspend @host.  Actual operation is performed by port suspend.
5377
 */
J
Jeff Garzik 已提交
5378
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5379
{
L
Lin Ming 已提交
5380 5381
	host->dev->power.power_state = mesg;
	return 0;
5382 5383 5384
}

/**
J
Jeff Garzik 已提交
5385 5386
 *	ata_host_resume - resume host
 *	@host: host to resume
5387
 *
L
Lin Ming 已提交
5388
 *	Resume @host.  Actual operation is performed by port resume.
5389
 */
J
Jeff Garzik 已提交
5390
void ata_host_resume(struct ata_host *host)
5391
{
5392
	host->dev->power.power_state = PMSG_ON;
5393
}
5394
#endif
5395

L
Lin Ming 已提交
5396 5397 5398 5399 5400 5401 5402
struct device_type ata_port_type = {
	.name = "ata_port",
#ifdef CONFIG_PM
	.pm = &ata_port_pm_ops,
#endif
};

5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413
/**
 *	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
5414
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5415
	struct ata_port *ap = link->ap;
5416 5417
	unsigned long flags;

T
Tejun Heo 已提交
5418
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5419 5420
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5421

5422 5423
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5424
	 * host lock.
5425
	 */
5426
	spin_lock_irqsave(ap->lock, flags);
5427
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5428
	dev->horkage = 0;
5429
	spin_unlock_irqrestore(ap->lock, flags);
5430

5431 5432
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5433 5434 5435 5436 5437
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5438 5439 5440 5441
/**
 *	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
5442
 *	@pmp: Port multiplier port number
5443 5444 5445 5446 5447 5448
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5449
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5450 5451 5452 5453
{
	int i;

	/* clear everything except for devices */
G
Gwendal Grignou 已提交
5454 5455
	memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
	       ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5456 5457

	link->ap = ap;
T
Tejun Heo 已提交
5458
	link->pmp = pmp;
5459 5460 5461 5462 5463 5464 5465 5466 5467
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

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

		dev->link = link;
		dev->devno = dev - link->device;
T
Tejun Heo 已提交
5468 5469 5470
#ifdef CONFIG_ATA_ACPI
		dev->gtf_filter = ata_acpi_gtf_filter;
#endif
5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487
		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.
 */
5488
int sata_link_init_spd(struct ata_link *link)
5489
{
5490
	u8 spd;
5491 5492
	int rc;

T
Tejun Heo 已提交
5493
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5494 5495 5496
	if (rc)
		return rc;

T
Tejun Heo 已提交
5497
	spd = (link->saved_scontrol >> 4) & 0xf;
5498 5499 5500
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5501
	ata_force_link_limits(link);
5502

5503 5504 5505 5506 5507
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5508
/**
5509 5510
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5511
 *
5512 5513 5514 5515
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5516
 *
L
Linus Torvalds 已提交
5517
 *	LOCKING:
5518
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5519
 */
5520
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5521
{
5522
	struct ata_port *ap;
L
Linus Torvalds 已提交
5523

5524 5525 5526 5527 5528
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;
5529

5530
	ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
J
Jeff Garzik 已提交
5531
	ap->lock = &host->lock;
5532
	ap->print_id = -1;
J
Jeff Garzik 已提交
5533
	ap->host = host;
5534
	ap->dev = host->dev;
5535 5536 5537 5538 5539 5540

#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
5541
#else
5542
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5543
#endif
L
Linus Torvalds 已提交
5544

5545
	mutex_init(&ap->scsi_scan_mutex);
5546 5547
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5548
	INIT_LIST_HEAD(&ap->eh_done_q);
5549
	init_waitqueue_head(&ap->eh_wait_q);
5550
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5551 5552 5553
	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
5554

5555 5556
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5557
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5558 5559 5560 5561 5562

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
5563 5564
	ata_sff_port_init(ap);

L
Linus Torvalds 已提交
5565 5566 5567
	return ap;
}

5568 5569 5570 5571 5572
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5573 5574 5575
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5576 5577 5578 5579
		if (!ap)
			continue;

		if (ap->scsi_host)
5580 5581
			scsi_host_put(ap->scsi_host);

5582
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5583
		kfree(ap->slave_link);
5584
		kfree(ap);
5585 5586 5587
		host->ports[i] = NULL;
	}

5588
	dev_set_drvdata(gendev, NULL);
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
/**
 *	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);
5633
	mutex_init(&host->eh_mutex);
5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656
	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;
}

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 5686 5687 5688 5689 5690 5691 5692 5693 5694
/**
 *	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;
5695
		ap->link.flags |= pi->link_flags;
5696 5697 5698 5699 5700 5701 5702 5703 5704
		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
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 5758 5759 5760 5761 5762 5763 5764 5765 5766
/**
 *	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;
}

5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784
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);
}

5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806
/**
 *	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)
{
5807
	static DEFINE_SPINLOCK(lock);
5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834
	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);
}

5835 5836 5837 5838 5839 5840 5841
/**
 *	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
5842 5843
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5844 5845 5846 5847 5848 5849 5850 5851 5852
 *
 *	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)
{
5853 5854
	int have_stop = 0;
	void *start_dr = NULL;
5855 5856 5857 5858 5859
	int i, rc;

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

5860 5861
	ata_finalize_port_ops(host->ops);

5862 5863 5864
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5865 5866
		ata_finalize_port_ops(ap->ops);

5867 5868 5869
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885
		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];

5886 5887 5888
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5889
				if (rc != -ENODEV)
5890 5891 5892
					dev_err(host->dev,
						"failed to start port %d (errno=%d)\n",
						i, rc);
5893 5894 5895 5896 5897 5898
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5899 5900
	if (start_dr)
		devres_add(host->dev, start_dr);
5901 5902 5903 5904 5905 5906 5907 5908 5909 5910
	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);
	}
5911
	devres_free(start_dr);
5912 5913 5914
	return rc;
}

5915
/**
J
Jeff Garzik 已提交
5916 5917 5918 5919 5920
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5921 5922 5923 5924 5925
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5926
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5927
void ata_host_init(struct ata_host *host, struct device *dev,
5928
		   unsigned long flags, struct ata_port_operations *ops)
5929
{
J
Jeff Garzik 已提交
5930
	spin_lock_init(&host->lock);
5931
	mutex_init(&host->eh_mutex);
J
Jeff Garzik 已提交
5932 5933 5934
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5935 5936
}

5937
int ata_port_probe(struct ata_port *ap)
5938
{
5939
	int rc = 0;
5940

5941 5942 5943 5944 5945 5946 5947 5948 5949
	/* probe */
	if (ap->ops->error_handler) {
		struct ata_eh_info *ehi = &ap->link.eh_info;
		unsigned long flags;

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

		ehi->probe_mask |= ATA_ALL_DEVICES;
5950
		ehi->action |= ATA_EH_RESET;
5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965
		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);
	}
5966 5967 5968 5969 5970 5971 5972
	return rc;
}


static void async_port_probe(void *data, async_cookie_t cookie)
{
	struct ata_port *ap = data;
5973

5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984
	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
	 */
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
		async_synchronize_cookie(cookie);

	(void)ata_port_probe(ap);
5985 5986 5987 5988 5989

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

	ata_scsi_scan_host(ap, 1);
5990
}
5991

5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013
/**
 *	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)) {
6014
		dev_err(host->dev, "BUG: trying to register unstarted host\n");
6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029
		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++;

6030

G
Gwendal Grignou 已提交
6031 6032 6033 6034 6035 6036 6037 6038
	/* Create associated sysfs transport objects  */
	for (i = 0; i < host->n_ports; i++) {
		rc = ata_tport_add(host->dev,host->ports[i]);
		if (rc) {
			goto err_tadd;
		}
	}

6039 6040
	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
G
Gwendal Grignou 已提交
6041
		goto err_tadd;
6042

6043 6044 6045
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6046 6047 6048 6049 6050 6051 6052 6053 6054 6055
	/* 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 */
6056
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6057 6058
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6059

6060
		/* print per-port info to dmesg */
6061 6062 6063
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6064
		if (!ata_port_is_dummy(ap)) {
6065 6066 6067 6068
			ata_port_info(ap, "%cATA max %s %s\n",
				      (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
				      ata_mode_string(xfer_mask),
				      ap->link.eh_info.desc);
6069 6070
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6071
			ata_port_info(ap, "DUMMY\n");
6072 6073
	}

V
Vegard Nossum 已提交
6074
	/* perform each probe asynchronously */
6075 6076
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6077
		async_schedule(async_port_probe, ap);
6078 6079 6080
	}

	return 0;
G
Gwendal Grignou 已提交
6081 6082 6083 6084 6085 6086 6087

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

6088 6089
}

6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102
/**
 *	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.
 *
6103 6104 6105 6106
 *	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.
 *
6107 6108 6109 6110 6111 6112 6113 6114 6115 6116
 *	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)
{
6117
	int i, rc;
6118 6119 6120 6121 6122

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

6123 6124 6125 6126 6127 6128
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6129 6130 6131 6132 6133
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6134 6135
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6136

6137 6138 6139 6140 6141 6142 6143 6144
	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;
}

6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155
/**
 *	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).
 */
6156
static void ata_port_detach(struct ata_port *ap)
6157 6158 6159 6160
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6161
		goto skip_eh;
6162 6163

	/* tell EH we're leaving & flush EH */
6164
	spin_lock_irqsave(ap->lock, flags);
6165
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6166
	ata_port_schedule_eh(ap);
6167
	spin_unlock_irqrestore(ap->lock, flags);
6168

T
Tejun Heo 已提交
6169
	/* wait till EH commits suicide */
6170 6171
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6172 6173
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6174

6175
	cancel_delayed_work_sync(&ap->hotplug_task);
6176

6177
 skip_eh:
G
Gwendal Grignou 已提交
6178 6179 6180 6181 6182 6183 6184
	if (ap->pmp_link) {
		int i;
		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
			ata_tlink_delete(&ap->pmp_link[i]);
	}
	ata_tport_delete(ap);

6185
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6186
	scsi_remove_host(ap->scsi_host);
6187 6188
}

T
Tejun Heo 已提交
6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203
/**
 *	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]);
6204 6205 6206

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6207 6208
}

6209 6210
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6211 6212 6213 6214
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6215 6216 6217
 *	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
6218 6219 6220 6221
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6222
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6223
{
6224
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6225
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6226

T
Tejun Heo 已提交
6227
	ata_host_detach(host);
L
Linus Torvalds 已提交
6228 6229 6230
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6231
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262
{
	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
6263

6264
#ifdef CONFIG_PM
6265
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6266 6267
{
	pci_save_state(pdev);
6268
	pci_disable_device(pdev);
6269

6270
	if (mesg.event & PM_EVENT_SLEEP)
6271
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6272 6273
}

6274
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6275
{
6276 6277
	int rc;

J
Jens Axboe 已提交
6278 6279
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6280

T
Tejun Heo 已提交
6281
	rc = pcim_enable_device(pdev);
6282
	if (rc) {
6283 6284
		dev_err(&pdev->dev,
			"failed to enable device after resume (%d)\n", rc);
6285 6286 6287
		return rc;
	}

J
Jens Axboe 已提交
6288
	pci_set_master(pdev);
6289
	return 0;
6290 6291
}

6292
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6293
{
J
Jeff Garzik 已提交
6294
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6295 6296
	int rc = 0;

J
Jeff Garzik 已提交
6297
	rc = ata_host_suspend(host, mesg);
6298 6299 6300
	if (rc)
		return rc;

6301
	ata_pci_device_do_suspend(pdev, mesg);
6302 6303 6304 6305 6306 6307

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6308
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6309
	int rc;
6310

6311 6312 6313 6314
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6315
}
6316 6317
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6318 6319
#endif /* CONFIG_PCI */

6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339
static int __init ata_parse_force_one(char **cur,
				      struct ata_force_ent *force_ent,
				      const char **reason)
{
	/* FIXME: Currently, there's no way to tag init const data and
	 * using __initdata causes build failure on some versions of
	 * gcc.  Once __initdataconst is implemented, add const to the
	 * following structure.
	 */
	static struct ata_force_param force_tbl[] __initdata = {
		{ "40c",	.cbl		= ATA_CBL_PATA40 },
		{ "80c",	.cbl		= ATA_CBL_PATA80 },
		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
		{ "sata",	.cbl		= ATA_CBL_SATA },
		{ "1.5Gbps",	.spd_limit	= 1 },
		{ "3.0Gbps",	.spd_limit	= 2 },
		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
6340
		{ "dump_id",	.horkage_on	= ATA_HORKAGE_DUMP_ID },
6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374
		{ "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) },
6375 6376 6377
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
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 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497
	};
	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
6498 6499 6500

static int __init ata_init(void)
{
G
Gwendal Grignou 已提交
6501
	int rc;
6502

6503 6504
	ata_parse_force_param();

6505
	rc = ata_sff_init();
6506 6507 6508 6509
	if (rc) {
		kfree(ata_force_tbl);
		return rc;
	}
6510

G
Gwendal Grignou 已提交
6511 6512 6513 6514 6515 6516
	libata_transport_init();
	ata_scsi_transport_template = ata_attach_transport();
	if (!ata_scsi_transport_template) {
		ata_sff_exit();
		rc = -ENOMEM;
		goto err_out;
6517
	}
G
Gwendal Grignou 已提交
6518

L
Linus Torvalds 已提交
6519 6520
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
G
Gwendal Grignou 已提交
6521 6522 6523

err_out:
	return rc;
L
Linus Torvalds 已提交
6524 6525 6526 6527
}

static void __exit ata_exit(void)
{
G
Gwendal Grignou 已提交
6528 6529
	ata_release_transport(ata_scsi_transport_template);
	libata_transport_exit();
6530
	ata_sff_exit();
6531
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6532 6533
}

6534
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6535 6536
module_exit(ata_exit);

A
Akinobu Mita 已提交
6537
static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
6538 6539 6540

int ata_ratelimit(void)
{
A
Akinobu Mita 已提交
6541
	return __ratelimit(&ratelimit);
6542 6543
}

6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557
/**
 *	ata_msleep - ATA EH owner aware msleep
 *	@ap: ATA port to attribute the sleep to
 *	@msecs: duration to sleep in milliseconds
 *
 *	Sleeps @msecs.  If the current task is owner of @ap's EH, the
 *	ownership is released before going to sleep and reacquired
 *	after the sleep is complete.  IOW, other ports sharing the
 *	@ap->host will be allowed to own the EH while this task is
 *	sleeping.
 *
 *	LOCKING:
 *	Might sleep.
 */
6558 6559
void ata_msleep(struct ata_port *ap, unsigned int msecs)
{
6560 6561 6562 6563 6564
	bool owns_eh = ap && ap->host->eh_owner == current;

	if (owns_eh)
		ata_eh_release(ap);

6565
	msleep(msecs);
6566 6567 6568

	if (owns_eh)
		ata_eh_acquire(ap);
6569 6570
}

6571 6572
/**
 *	ata_wait_register - wait until register value changes
6573
 *	@ap: ATA port to wait register for, can be NULL
6574 6575 6576
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6577 6578
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594
 *
 *	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.
 */
6595
u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
6596
		      unsigned long interval, unsigned long timeout)
6597
{
6598
	unsigned long deadline;
6599 6600 6601 6602 6603 6604 6605 6606
	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.
	 */
6607
	deadline = ata_deadline(jiffies, timeout);
6608

6609
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6610
		ata_msleep(ap, interval);
6611 6612 6613 6614 6615 6616
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6617 6618 6619
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6620
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6621
{
T
Tejun Heo 已提交
6622
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6623 6624
}

T
Tejun Heo 已提交
6625
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6626
{
T
Tejun Heo 已提交
6627
	/* truly dummy */
T
Tejun Heo 已提交
6628 6629
}

6630
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6631 6632
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6633
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6634 6635
};

6636 6637 6638 6639
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709
/*
 * Utility print functions
 */
int ata_port_printk(const struct ata_port *ap, const char *level,
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	r = printk("%sata%u: %pV", level, ap->print_id, &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(ata_port_printk);

int ata_link_printk(const struct ata_link *link, const char *level,
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	if (sata_pmp_attached(link->ap) || link->ap->slave_link)
		r = printk("%sata%u.%02u: %pV",
			   level, link->ap->print_id, link->pmp, &vaf);
	else
		r = printk("%sata%u: %pV",
			   level, link->ap->print_id, &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(ata_link_printk);

int ata_dev_printk(const struct ata_device *dev, const char *level,
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	r = printk("%sata%u.%02u: %pV",
		   level, dev->link->ap->print_id, dev->link->pmp + dev->devno,
		   &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(ata_dev_printk);

6710 6711 6712 6713 6714 6715
void ata_print_version(const struct device *dev, const char *version)
{
	dev_printk(KERN_DEBUG, dev, "version %s\n", version);
}
EXPORT_SYMBOL(ata_print_version);

L
Linus Torvalds 已提交
6716 6717 6718 6719 6720 6721
/*
 * 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.
 */
6722 6723 6724
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6725 6726
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6727
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6728
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6729 6730
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6731
EXPORT_SYMBOL_GPL(ata_std_bios_param);
6732
EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
J
Jeff Garzik 已提交
6733
EXPORT_SYMBOL_GPL(ata_host_init);
6734
EXPORT_SYMBOL_GPL(ata_host_alloc);
6735
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6736
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6737
EXPORT_SYMBOL_GPL(ata_host_start);
6738
EXPORT_SYMBOL_GPL(ata_host_register);
6739
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6740
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6741
EXPORT_SYMBOL_GPL(ata_sg_init);
6742
EXPORT_SYMBOL_GPL(ata_qc_complete);
6743
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6744
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6745 6746
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6747 6748 6749 6750 6751 6752 6753
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);
6754
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6755
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6756
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6757
EXPORT_SYMBOL_GPL(ata_dev_disable);
6758
EXPORT_SYMBOL_GPL(sata_set_spd);
6759
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6760 6761
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6762
EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
6763
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6764
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6765
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6766
EXPORT_SYMBOL_GPL(ata_std_postreset);
6767 6768
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
6769
EXPORT_SYMBOL_GPL(ata_ratelimit);
6770
EXPORT_SYMBOL_GPL(ata_msleep);
6771
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6772 6773
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6774
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6775
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6776
EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
6777 6778 6779 6780
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);
6781 6782
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6783
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6784 6785
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6786
#endif /* CONFIG_PM */
6787 6788
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6789
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6790 6791
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6792
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6793
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6794 6795
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6796
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6797

L
Linus Torvalds 已提交
6798 6799 6800
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6801
#ifdef CONFIG_PM
6802 6803
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6804 6805
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6806
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6807
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6808

T
Tejun Heo 已提交
6809 6810 6811
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6812 6813 6814 6815
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6816
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6817
EXPORT_SYMBOL_GPL(ata_link_abort);
6818
EXPORT_SYMBOL_GPL(ata_port_abort);
6819
EXPORT_SYMBOL_GPL(ata_port_freeze);
6820
EXPORT_SYMBOL_GPL(sata_async_notification);
6821 6822
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6823 6824
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6825
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6826
EXPORT_SYMBOL_GPL(ata_do_eh);
6827
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6828 6829 6830 6831

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6832
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6833
EXPORT_SYMBOL_GPL(ata_cable_sata);