libata-core.c 173.0 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.h>
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#include <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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atomic_t ata_print_id = ATOMIC_INIT(0);
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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;
698
			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;
719 720 721 722 723
	}

	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;
894 895
	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);
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
	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;
	}

1073
	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

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
1976 1977 1978 1979 1980 1981
		if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
							ata_id_is_ata(id)) {
			ata_dev_dbg(dev,
				"host indicates ignore ATA devices, ignored\n");
			return -ENOENT;
		}
1982 1983 1984
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1985 1986
	}

1987 1988 1989 1990 1991 1992 1993
	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.
		 */
1994
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1995
		if (err_mask && id[2] != 0x738c) {
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
			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;
	}

2008
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2009 2010 2011
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2012 2013
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2014 2015
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2016 2017
		 *
		 * Note that ATA4 says lba is mandatory so the second check
2018
		 * should never trigger.
2019 2020
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2021
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2022 2023 2024 2025 2026 2027 2028 2029 2030
			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.
			 */
2031
			flags &= ~ATA_READID_POSTRESET;
2032 2033 2034 2035 2036
			goto retry;
		}
	}

	*p_class = class;
2037

2038 2039 2040
	return 0;

 err_out:
T
Tejun Heo 已提交
2041
	if (ata_msg_warn(ap))
2042 2043
		ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
			     reason, err_mask);
2044 2045 2046
	return rc;
}

2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072
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) {
2073 2074
		ata_dev_info(dev, "applying link speed limit horkage to %s\n",
			     sata_spd_string(target));
2075 2076 2077 2078 2079
		return -EAGAIN;
	}
	return 0;
}

T
Tejun Heo 已提交
2080
static inline u8 ata_dev_knobble(struct ata_device *dev)
2081
{
T
Tejun Heo 已提交
2082
	struct ata_port *ap = dev->link->ap;
2083 2084 2085 2086

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

T
Tejun Heo 已提交
2087
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2088 2089
}

2090
static int ata_dev_config_ncq(struct ata_device *dev,
2091 2092
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2093
	struct ata_port *ap = dev->link->ap;
2094
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2095 2096
	unsigned int err_mask;
	char *aa_desc = "";
2097 2098 2099

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2100
		return 0;
2101
	}
T
Tejun Heo 已提交
2102
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2103
		snprintf(desc, desc_sz, "NCQ (not used)");
2104
		return 0;
2105
	}
2106
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2107
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2108 2109 2110
		dev->flags |= ATA_DFLAG_NCQ;
	}

2111 2112 2113 2114 2115 2116
	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) {
2117 2118 2119
			ata_dev_err(dev,
				    "failed to enable AA (error_mask=0x%x)\n",
				    err_mask);
2120 2121 2122 2123 2124 2125 2126 2127
			if (err_mask != AC_ERR_DEV) {
				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
				return -EIO;
			}
		} else
			aa_desc = ", AA";
	}

2128
	if (hdepth >= ddepth)
2129
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2130
	else
2131 2132 2133
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
	return 0;
2134 2135
}

2136
/**
2137 2138 2139 2140 2141
 *	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.
2142 2143
 *
 *	LOCKING:
2144 2145 2146 2147
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2148
 */
2149
int ata_dev_configure(struct ata_device *dev)
2150
{
T
Tejun Heo 已提交
2151 2152
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2153
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2154
	const u16 *id = dev->id;
2155
	unsigned long xfer_mask;
2156
	char revbuf[7];		/* XYZ-99\0 */
2157 2158
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2159
	int rc;
2160

2161
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2162
		ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2163
		return 0;
2164 2165
	}

2166
	if (ata_msg_probe(ap))
2167
		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2168

T
Tejun Heo 已提交
2169 2170
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2171
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2172

2173
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
2174
		ata_dev_info(dev, "unsupported device, disabling\n");
2175 2176 2177 2178
		ata_dev_disable(dev);
		return 0;
	}

2179 2180
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
2181 2182 2183
		ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
			     atapi_enabled ? "not supported with this driver"
			     : "disabled");
2184 2185 2186 2187
		ata_dev_disable(dev);
		return 0;
	}

2188 2189 2190 2191
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2192 2193 2194 2195
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2196

T
Tejun Heo 已提交
2197 2198 2199 2200 2201
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2202
	/* print device capabilities */
2203
	if (ata_msg_probe(ap))
2204 2205 2206 2207 2208 2209
		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]);
2210

2211
	/* initialize to-be-configured parameters */
2212
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2213 2214 2215 2216 2217 2218
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2219
	dev->multi_count = 0;
2220

L
Linus Torvalds 已提交
2221 2222 2223 2224
	/*
	 * common ATA, ATAPI feature tests
	 */

2225
	/* find max transfer mode; for printk only */
2226
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2227

2228 2229
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2230

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

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

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

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

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

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

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

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

			/* Default translation */
2300 2301 2302
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2303

2304
			if (ata_id_current_chs_valid(id)) {
2305
				/* Current CHS translation is valid. */
2306 2307 2308
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2309 2310 2311
			}

			/* print device info to dmesg */
2312
			if (ata_msg_drv(ap) && print_info) {
2313 2314 2315 2316 2317 2318 2319 2320
				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);
2321
			}
2322 2323
		}

2324
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2325 2326 2327
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2328
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2329 2330
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2331
		const char *dma_dir_string = "";
2332
		u32 sntf;
2333

2334
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2335
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2336
			if (ata_msg_warn(ap))
2337
				ata_dev_warn(dev, "unsupported CDB len\n");
2338
			rc = -EINVAL;
L
Linus Torvalds 已提交
2339 2340
			goto err_out_nosup;
		}
2341
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2342

2343 2344 2345 2346
		/* 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.
2347
		 */
T
Tejun Heo 已提交
2348 2349
		if (atapi_an &&
		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2350
		    (!sata_pmp_attached(ap) ||
2351
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2352 2353
			unsigned int err_mask;

2354
			/* issue SET feature command to turn this on */
2355 2356
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2357
			if (err_mask)
2358 2359 2360
				ata_dev_err(dev,
					    "failed to enable ATAPI AN (err_mask=0x%x)\n",
					    err_mask);
T
Tejun Heo 已提交
2361
			else {
2362
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2363 2364
				atapi_an_string = ", ATAPI AN";
			}
2365 2366
		}

2367
		if (ata_id_cdb_intr(dev->id)) {
2368
			dev->flags |= ATA_DFLAG_CDB_INTR;
2369 2370
			cdb_intr_string = ", CDB intr";
		}
2371

2372 2373 2374 2375 2376
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2377
		/* print device info to dmesg */
2378
		if (ata_msg_drv(ap) && print_info)
2379 2380 2381 2382 2383 2384
			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
2385 2386
	}

2387 2388 2389 2390 2391
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2392 2393
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2394
	if (ata_dev_knobble(dev)) {
2395
		if (ata_msg_drv(ap) && print_info)
2396
			ata_dev_info(dev, "applying bridge limits\n");
2397
		dev->udma_mask &= ATA_UDMA5;
2398 2399 2400
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2401
	if ((dev->class == ATA_DEV_ATAPI) &&
2402
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2403
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2404 2405
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2406

T
Tejun Heo 已提交
2407
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2408 2409
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2410

2411
	if (ap->ops->dev_config)
2412
		ap->ops->dev_config(dev);
2413

2414 2415 2416 2417 2418 2419 2420 2421
	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) {
2422
			ata_dev_warn(dev,
2423
"Drive reports diagnostics failure. This may indicate a drive\n");
2424
			ata_dev_warn(dev,
2425 2426 2427 2428
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2429
	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2430 2431
		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");
2432 2433
	}

2434
	return 0;
L
Linus Torvalds 已提交
2435 2436

err_out_nosup:
2437
	if (ata_msg_probe(ap))
2438
		ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2439
	return rc;
L
Linus Torvalds 已提交
2440 2441
}

A
Alan Cox 已提交
2442
/**
2443
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2444 2445
 *	@ap: port
 *
2446
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2447 2448 2449 2450 2451 2452 2453 2454 2455
 *	detection.
 */

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

/**
2456
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2457 2458
 *	@ap: port
 *
2459
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
 *	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
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491
/**
 *	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
2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503
/**
 *	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
2504 2505 2506 2507
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2508 2509 2510 2511
 *	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
2512
 *	LOCKING:
J
Jeff Garzik 已提交
2513
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2514 2515
 *
 *	RETURNS:
2516
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2517 2518
 */

2519
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2520
{
2521
	unsigned int classes[ATA_MAX_DEVICES];
2522
	int tries[ATA_MAX_DEVICES];
2523
	int rc;
2524
	struct ata_device *dev;
L
Linus Torvalds 已提交
2525

T
Tejun Heo 已提交
2526
	ata_for_each_dev(dev, &ap->link, ALL)
2527
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2528 2529

 retry:
T
Tejun Heo 已提交
2530
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548
		/* 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);
	}

2549
	/* reset and determine device classes */
2550
	ap->ops->phy_reset(ap);
2551

T
Tejun Heo 已提交
2552
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2553
		if (dev->class != ATA_DEV_UNKNOWN)
2554 2555 2556
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2557

2558
		dev->class = ATA_DEV_UNKNOWN;
2559
	}
L
Linus Torvalds 已提交
2560

2561 2562 2563 2564
	/* 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
2565
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2566 2567
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2568

2569
		if (!ata_dev_enabled(dev))
2570 2571
			continue;

2572 2573
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2574 2575
		if (rc)
			goto fail;
2576 2577
	}

A
Alan Cox 已提交
2578 2579 2580 2581
	/* 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
2582 2583 2584 2585 2586 2587
	/* 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
2588 2589 2590
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2591 2592 2593
	/* 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
2594
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2595
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2596
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2597
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2598 2599
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2600 2601
	}

2602
	/* configure transfer mode */
2603
	rc = ata_set_mode(&ap->link, &dev);
2604
	if (rc)
2605
		goto fail;
L
Linus Torvalds 已提交
2606

T
Tejun Heo 已提交
2607 2608
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2609

2610
	return -ENODEV;
2611 2612

 fail:
2613 2614
	tries[dev->devno]--;

2615 2616
	switch (rc) {
	case -EINVAL:
2617
		/* eeek, something went very wrong, give up */
2618 2619
		tries[dev->devno] = 0;
		break;
2620 2621 2622 2623

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2624
	case -EIO:
2625 2626 2627 2628
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2629
			sata_down_spd_limit(&ap->link, 0);
2630 2631
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2632 2633
	}

2634
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2635
		ata_dev_disable(dev);
2636

2637
	goto retry;
L
Linus Torvalds 已提交
2638 2639
}

2640 2641
/**
 *	sata_print_link_status - Print SATA link status
2642
 *	@link: SATA link to printk link status about
2643 2644 2645 2646 2647 2648
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2649
static void sata_print_link_status(struct ata_link *link)
2650
{
2651
	u32 sstatus, scontrol, tmp;
2652

2653
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2654
		return;
2655
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2656

T
Tejun Heo 已提交
2657
	if (ata_phys_link_online(link)) {
2658
		tmp = (sstatus >> 4) & 0xf;
2659 2660
		ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
			      sata_spd_string(tmp), sstatus, scontrol);
2661
	} else {
2662 2663
		ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
			      sstatus, scontrol);
2664 2665 2666
	}
}

2667 2668 2669 2670 2671 2672 2673
/**
 *	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
 */
2674

T
Tejun Heo 已提交
2675
struct ata_device *ata_dev_pair(struct ata_device *adev)
2676
{
T
Tejun Heo 已提交
2677 2678
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2679
	if (!ata_dev_enabled(pair))
2680 2681 2682 2683
		return NULL;
	return pair;
}

2684
/**
2685
 *	sata_down_spd_limit - adjust SATA spd limit downward
2686
 *	@link: Link to adjust SATA spd limit for
2687
 *	@spd_limit: Additional limit
2688
 *
2689
 *	Adjust SATA spd limit of @link downward.  Note that this
2690
 *	function only adjusts the limit.  The change must be applied
2691
 *	using sata_set_spd().
2692
 *
2693 2694 2695 2696 2697
 *	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.
 *
2698 2699 2700 2701 2702 2703
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2704
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2705
{
2706
	u32 sstatus, spd, mask;
2707
	int rc, bit;
2708

2709
	if (!sata_scr_valid(link))
2710 2711 2712
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2713
	 * If not, use cached value in link->sata_spd.
2714
	 */
2715
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2716
	if (rc == 0 && ata_sstatus_online(sstatus))
2717 2718
		spd = (sstatus >> 4) & 0xf;
	else
2719
		spd = link->sata_spd;
2720

2721
	mask = link->sata_spd_limit;
2722 2723
	if (mask <= 1)
		return -EINVAL;
2724 2725

	/* unconditionally mask off the highest bit */
2726 2727
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2728

2729 2730 2731 2732 2733 2734 2735 2736 2737
	/* 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? */
2738 2739 2740
	if (!mask)
		return -EINVAL;

2741 2742 2743 2744 2745 2746 2747 2748 2749
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

2750
	link->sata_spd_limit = mask;
2751

2752 2753
	ata_link_warn(link, "limiting SATA link speed to %s\n",
		      sata_spd_string(fls(mask)));
2754 2755 2756 2757

	return 0;
}

2758
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2759
{
2760 2761
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2762

2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773
	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;
2774
	else
2775
		target = fls(limit);
2776 2777

	spd = (*scontrol >> 4) & 0xf;
2778
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2779

2780
	return spd != target;
2781 2782 2783
}

/**
2784
 *	sata_set_spd_needed - is SATA spd configuration needed
2785
 *	@link: Link in question
2786 2787
 *
 *	Test whether the spd limit in SControl matches
2788
 *	@link->sata_spd_limit.  This function is used to determine
2789 2790 2791 2792 2793 2794 2795 2796 2797
 *	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
2798
static int sata_set_spd_needed(struct ata_link *link)
2799 2800 2801
{
	u32 scontrol;

2802
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2803
		return 1;
2804

2805
	return __sata_set_spd_needed(link, &scontrol);
2806 2807 2808
}

/**
2809
 *	sata_set_spd - set SATA spd according to spd limit
2810
 *	@link: Link to set SATA spd for
2811
 *
2812
 *	Set SATA spd of @link according to sata_spd_limit.
2813 2814 2815 2816 2817 2818
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2819
 *	changed.  Negative errno if SCR registers are inaccessible.
2820
 */
2821
int sata_set_spd(struct ata_link *link)
2822 2823
{
	u32 scontrol;
2824
	int rc;
2825

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

2829
	if (!__sata_set_spd_needed(link, &scontrol))
2830 2831
		return 0;

2832
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2833 2834
		return rc;

2835 2836 2837
	return 1;
}

A
Alan Cox 已提交
2838 2839 2840 2841 2842
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2843
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2844
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2845 2846 2847
 * 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
2848 2849 2850
 */

static const struct ata_timing ata_timing[] = {
2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877
/*	{ 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
2878 2879 2880 2881

	{ 0xFF }
};

2882 2883
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2884 2885 2886

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
2887 2888 2889 2890 2891 2892 2893 2894 2895
	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
2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906
}

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);
2907
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
2908 2909 2910 2911
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2912
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2913
{
2914 2915 2916 2917
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2918

2919 2920 2921
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
2922 2923 2924 2925 2926
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
2927
	const u16 *id = adev->id;
A
Alan Cox 已提交
2928 2929 2930 2931
	const struct ata_timing *s;
	struct ata_timing p;

	/*
2932
	 * Find the mode.
2933
	 */
A
Alan Cox 已提交
2934 2935 2936 2937

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

2938 2939
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2940 2941 2942 2943 2944
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

2945
	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
A
Alan Cox 已提交
2946
		memset(&p, 0, sizeof(p));
2947

2948
		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
2949 2950 2951 2952 2953 2954 2955 2956
			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
2957 2958 2959 2960 2961 2962 2963
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

2964
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2965 2966

	/*
2967 2968 2969
	 * 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
2970 2971
	 */

2972
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2973 2974 2975 2976 2977
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2978
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
	 */

	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
2990

2991 2992 2993 2994 2995
	/* 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
2996 2997 2998 2999

	return 0;
}

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 3045 3046 3047 3048 3049 3050
/**
 *	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;
}

3051 3052 3053
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3054
 *	@sel: ATA_DNXFER_* selector
3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065
 *
 *	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
 */
3066
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3067
{
3068
	char buf[32];
3069 3070
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3071
	int quiet, highbit;
3072

3073 3074
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3075

3076 3077 3078 3079
	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);
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 3124 3125 3126 3127 3128 3129
	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));

3130
		ata_dev_warn(dev, "limiting speed to %s\n", buf);
3131
	}
3132 3133 3134 3135 3136 3137 3138

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

	return 0;
}

T
Tejun Heo 已提交
3139
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3140
{
3141
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3142
	struct ata_eh_context *ehc = &dev->link->eh_context;
3143
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3144 3145
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3146
	unsigned int err_mask = 0;
3147
	int rc;
L
Linus Torvalds 已提交
3148

3149
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3150 3151 3152
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3153 3154 3155 3156
	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
		dev_err_whine = " (SET_XFERMODE skipped)";
	else {
		if (nosetxfer)
3157 3158 3159
			ata_dev_warn(dev,
				     "NOSETXFER but PATA detected - can't "
				     "skip SETXFER, might malfunction\n");
3160 3161
		err_mask = ata_dev_set_xfermode(dev);
	}
3162

3163 3164 3165 3166 3167 3168 3169 3170 3171 3172
	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;

3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187
	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;
	}
3188 3189
	/* 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 */
3190
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3191 3192
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3193
		ign_dev_err = 1;
3194

3195 3196 3197
	/* 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
3198

3199 3200 3201 3202 3203 3204
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3205

3206 3207
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3208

3209 3210 3211
	ata_dev_info(dev, "configured for %s%s\n",
		     ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		     dev_err_whine);
3212

3213
	return 0;
3214 3215

 fail:
3216
	ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3217
	return -EIO;
L
Linus Torvalds 已提交
3218 3219 3220
}

/**
3221
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3222
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3223
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3224
 *
3225 3226 3227
 *	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
3228
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3229
 *
L
Linus Torvalds 已提交
3230
 *	LOCKING:
J
Jeff Garzik 已提交
3231
 *	PCI/etc. bus probe sem.
3232 3233 3234
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3235
 */
3236

3237
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3238
{
3239
	struct ata_port *ap = link->ap;
3240
	struct ata_device *dev;
3241
	int rc = 0, used_dma = 0, found = 0;
3242

3243
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3244
	ata_for_each_dev(dev, link, ENABLED) {
3245
		unsigned long pio_mask, dma_mask;
3246
		unsigned int mode_mask;
3247

3248 3249 3250 3251 3252 3253
		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
3254
		ata_dev_xfermask(dev);
3255
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3256

3257
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3258 3259

		if (libata_dma_mask & mode_mask)
3260 3261
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
						     dev->udma_mask);
3262 3263 3264
		else
			dma_mask = 0;

3265 3266
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3267

3268
		found = 1;
3269
		if (ata_dma_enabled(dev))
3270
			used_dma = 1;
3271
	}
3272
	if (!found)
3273
		goto out;
3274 3275

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3276
	ata_for_each_dev(dev, link, ENABLED) {
3277
		if (dev->pio_mode == 0xff) {
3278
			ata_dev_warn(dev, "no PIO support\n");
3279
			rc = -EINVAL;
3280
			goto out;
3281 3282 3283 3284 3285 3286 3287
		}

		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
3288

3289
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3290 3291
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3292 3293 3294 3295 3296 3297 3298
			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
3299 3300

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3301
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3302
		rc = ata_dev_set_mode(dev);
3303
		if (rc)
3304
			goto out;
3305
	}
L
Linus Torvalds 已提交
3306

3307 3308
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3309
	 */
J
Jeff Garzik 已提交
3310
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3311
		ap->host->simplex_claimed = ap;
3312

3313 3314 3315 3316
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3317 3318
}

3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342
/**
 *	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;
3343
	unsigned long nodev_deadline;
3344 3345
	int warned = 0;

3346 3347 3348 3349 3350 3351
	/* 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
3352 3353 3354 3355 3356 3357
	/* 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);

3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368
	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;

3369 3370
		/*
		 * -ENODEV could be transient.  Ignore -ENODEV if link
3371
		 * is online.  Also, some SATA devices take a long
3372 3373 3374
		 * time to clear 0xff after reset.  Wait for
		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
		 * offline.
3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395
		 *
		 * 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)) {
3396
			ata_link_warn(link,
3397 3398 3399 3400 3401
				"link is slow to respond, please be patient "
				"(ready=%d)\n", tmp);
			warned = 1;
		}

3402
		ata_msleep(link->ap, 50);
3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419
	}
}

/**
 *	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.
 */
3420
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3421 3422
				int (*check_ready)(struct ata_link *link))
{
3423
	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3424 3425 3426 3427

	return ata_wait_ready(link, deadline, check_ready);
}

3428
/**
3429 3430
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3431
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3432
 *	@deadline: deadline jiffies for the operation
3433
 *
3434
 *	Make sure SStatus of @link reaches stable state, determined by
3435 3436
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3437 3438
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3439 3440
 *	until timeout then returns 0 if DET is stable at 1.
 *
3441 3442 3443
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3444 3445 3446 3447 3448 3449
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3450 3451
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3452
{
3453 3454
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3455
	unsigned long last_jiffies, t;
3456 3457 3458
	u32 last, cur;
	int rc;

3459
	t = ata_deadline(jiffies, params[2]);
3460 3461 3462
	if (time_before(t, deadline))
		deadline = t;

3463
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3464 3465 3466 3467 3468 3469 3470
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3471
		ata_msleep(link->ap, interval);
3472
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3473 3474 3475 3476 3477
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3478
			if (cur == 1 && time_before(jiffies, deadline))
3479
				continue;
3480 3481
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3482 3483 3484 3485 3486 3487 3488 3489
				return 0;
			continue;
		}

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

3490 3491 3492
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3493
		if (time_after(jiffies, deadline))
3494
			return -EPIPE;
3495 3496 3497 3498
	}
}

/**
3499 3500
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3501
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3502
 *	@deadline: deadline jiffies for the operation
3503
 *
3504
 *	Resume SATA phy @link and debounce it.
3505 3506 3507 3508 3509 3510 3511
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3512 3513
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3514
{
3515
	int tries = ATA_LINK_RESUME_TRIES;
3516
	u32 scontrol, serror;
3517 3518
	int rc;

3519
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3520
		return rc;
3521

3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535
	/*
	 * 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.
		 */
3536
		ata_msleep(link->ap, 200);
3537

3538 3539 3540 3541
		/* is SControl restored correctly? */
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
			return rc;
	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3542

3543
	if ((scontrol & 0xf0f) != 0x300) {
3544
		ata_link_warn(link, "failed to resume link (SControl %X)\n",
3545
			     scontrol);
3546 3547 3548 3549
		return 0;
	}

	if (tries < ATA_LINK_RESUME_TRIES)
3550 3551
		ata_link_warn(link, "link resume succeeded after %d retries\n",
			      ATA_LINK_RESUME_TRIES - tries);
3552

3553 3554 3555
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3556
	/* clear SError, some PHYs require this even for SRST to work */
3557 3558 3559
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3560
	return rc != -EINVAL ? rc : 0;
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 3603 3604 3605 3606 3607 3608
/**
 *	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:
3609 3610 3611 3612 3613 3614 3615 3616
		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);
		}
3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634
		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);
}

3635
/**
3636
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3637
 *	@link: ATA link to be reset
3638
 *	@deadline: deadline jiffies for the operation
3639
 *
T
Tejun Heo 已提交
3640
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3641 3642 3643 3644
 *	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.
3645 3646 3647 3648 3649 3650 3651
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3652
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3653
{
T
Tejun Heo 已提交
3654
	struct ata_port *ap = link->ap;
3655
	struct ata_eh_context *ehc = &link->eh_context;
3656
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3657 3658 3659 3660 3661 3662
	int rc;

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

3663
	/* if SATA, resume link */
3664
	if (ap->flags & ATA_FLAG_SATA) {
3665
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3666 3667
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3668 3669 3670
			ata_link_warn(link,
				      "failed to resume link for reset (errno=%d)\n",
				      rc);
3671 3672
	}

3673
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3674
	if (ata_phys_link_offline(link))
3675 3676
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3677 3678 3679
	return 0;
}

3680
/**
T
Tejun Heo 已提交
3681 3682 3683
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3684
 *	@deadline: deadline jiffies for the operation
3685 3686
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3687
 *
T
Tejun Heo 已提交
3688
 *	SATA phy-reset @link using DET bits of SControl register.
3689 3690 3691 3692 3693 3694 3695 3696
 *	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.
3697 3698 3699 3700 3701 3702 3703
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3704
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3705 3706
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3707
{
T
Tejun Heo 已提交
3708
	u32 scontrol;
3709
	int rc;
3710

3711 3712
	DPRINTK("ENTER\n");

3713 3714 3715
	if (online)
		*online = false;

3716
	if (sata_set_spd_needed(link)) {
3717 3718 3719 3720 3721
		/* 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.
		 */
3722
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3723
			goto out;
3724

3725
		scontrol = (scontrol & 0x0f0) | 0x304;
3726

3727
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3728
			goto out;
3729

3730
		sata_set_spd(link);
3731 3732 3733
	}

	/* issue phy wake/reset */
3734
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3735
		goto out;
3736

3737
	scontrol = (scontrol & 0x0f0) | 0x301;
3738

3739
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3740
		goto out;
3741

3742
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3743 3744
	 * 10.4.2 says at least 1 ms.
	 */
3745
	ata_msleep(link->ap, 1);
3746

3747 3748
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3749 3750 3751
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3752
	if (ata_phys_link_offline(link))
3753 3754 3755 3756 3757 3758
		goto out;

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

T
Tejun Heo 已提交
3759
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3760 3761 3762 3763 3764 3765 3766 3767
		/* 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;

3768 3769
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780
			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);
3781
 out:
3782 3783 3784 3785
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3786
		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
3787
	}
3788 3789 3790 3791
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817
/**
 *	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;
}

3818
/**
3819
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3820
 *	@link: the target ata_link
3821 3822 3823 3824 3825 3826 3827 3828 3829
 *	@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)
 */
3830
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3831
{
3832 3833
	u32 serror;

3834 3835
	DPRINTK("ENTER\n");

3836 3837 3838 3839
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3840
	/* print link status */
3841
	sata_print_link_status(link);
3842 3843 3844 3845

	DPRINTK("EXIT\n");
}

3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861
/**
 *	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
3862 3863
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3864 3865
{
	const u16 *old_id = dev->id;
3866 3867
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3868 3869

	if (dev->class != new_class) {
3870 3871
		ata_dev_info(dev, "class mismatch %d != %d\n",
			     dev->class, new_class);
3872 3873 3874
		return 0;
	}

3875 3876 3877 3878
	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]));
3879 3880

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

	if (strcmp(serial[0], serial[1])) {
3887 3888
		ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
			     serial[0], serial[1]);
3889 3890 3891 3892 3893 3894 3895
		return 0;
	}

	return 1;
}

/**
3896
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3897
 *	@dev: target ATA device
3898
 *	@readid_flags: read ID flags
3899 3900 3901 3902 3903 3904 3905 3906 3907 3908
 *
 *	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
 */
3909
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3910
{
3911
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3912
	u16 *id = (void *)dev->link->ap->sector_buf;
3913 3914
	int rc;

3915
	/* read ID data */
3916
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3917
	if (rc)
3918
		return rc;
3919 3920

	/* is the device still there? */
3921 3922
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3923

3924
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3925 3926 3927 3928 3929 3930
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3931
 *	@new_class: new class code
3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942
 *	@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
 */
3943 3944
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3945
{
3946
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
3947
	u64 n_native_sectors = dev->n_native_sectors;
3948 3949 3950 3951 3952
	int rc;

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

3953 3954
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
3955 3956 3957
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
3958 3959
		ata_dev_info(dev, "class mismatch %u != %u\n",
			     dev->class, new_class);
3960 3961 3962 3963
		rc = -ENODEV;
		goto fail;
	}

3964 3965 3966 3967
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3968 3969

	/* configure device according to the new ID */
3970
	rc = ata_dev_configure(dev);
3971 3972 3973 3974
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
T
Tejun Heo 已提交
3975 3976 3977 3978 3979
	if (dev->class != ATA_DEV_ATA || !n_sectors ||
	    dev->n_sectors == n_sectors)
		return 0;

	/* n_sectors has changed */
3980 3981 3982
	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
3983 3984 3985 3986 3987 3988 3989 3990

	/*
	 * 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) {
3991 3992 3993
		ata_dev_warn(dev,
			     "new n_sectors matches native, probably "
			     "late HPA unlock, n_sectors updated\n");
3994
		/* use the larger n_sectors */
T
Tejun Heo 已提交
3995
		return 0;
3996 3997
	}

T
Tejun Heo 已提交
3998 3999 4000 4001 4002 4003 4004 4005 4006
	/*
	 * 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)) {
4007 4008 4009
		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
4010 4011 4012 4013 4014
		/* try unlocking HPA */
		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
		rc = -EIO;
	} else
		rc = -ENODEV;
4015

T
Tejun Heo 已提交
4016 4017 4018
	/* restore original n_[native_]sectors and fail */
	dev->n_native_sectors = n_native_sectors;
	dev->n_sectors = n_sectors;
4019
 fail:
4020
	ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4021 4022 4023
	return rc;
}

4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040
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 },
4041
	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
4042 4043 4044 4045 4046
	{ "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 },
4047
	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
4048 4049 4050 4051 4052 4053 4054 4055 4056 4057
	{ "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 },
4058
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4059
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4060
	{ "2GB ATA Flash Disk", "ADMA428M",	ATA_HORKAGE_NODMA },
4061
	/* Odd clown on sil3726/4726 PMPs */
4062
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4063

4064
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4065
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4066
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4067

4068 4069 4070 4071
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4072
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4073
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4074 4075
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4076
	/* NCQ is broken */
4077
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4078
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4079
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4080
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4081
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4082

4083
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4084
	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4085
						ATA_HORKAGE_FIRMWARE_WARN },
4086

4087
	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4088 4089
						ATA_HORKAGE_FIRMWARE_WARN },

4090
	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4091 4092
						ATA_HORKAGE_FIRMWARE_WARN },

4093
	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4094 4095
						ATA_HORKAGE_FIRMWARE_WARN },

4096 4097 4098 4099 4100
	/* 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, },
4101

4102 4103 4104
	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },

4105 4106 4107 4108 4109
	/* 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 },
4110

T
Tejun Heo 已提交
4111 4112 4113
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4114 4115 4116
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4117
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4118

A
Alan Cox 已提交
4119 4120
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4121
	/* Maybe we should just blacklist TSSTcorp... */
4122
	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4123

4124 4125 4126
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4127 4128 4129
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },

4130 4131 4132 4133
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
4134
	{ "PIONEER DVD-RW  DVRTD08",	NULL,	ATA_HORKAGE_NOSETXFER },
4135 4136
	{ "PIONEER DVD-RW  DVRTD08A",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-215",	NULL,	ATA_HORKAGE_NOSETXFER },
4137 4138
	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
4139

4140 4141
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4142
};
4143

4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155
/**
 *	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.
4156 4157
 *		[a-d]	matches a single character from the range: a, b, c, or d.
 *		[a-d0-9] matches a single character from either range.
4158
 *
4159 4160
 *	The special characters ?, [, -, or *, can be matched using a set, eg. [*]
 *	Behaviour with malformed patterns is undefined, though generally reasonable.
4161
 *
4162
 *	Sample patterns:  "SD1?",  "SD1[0-5]",  "*R0",  "SD*1?[012]*xx"
4163 4164 4165 4166 4167 4168 4169 4170 4171
 *
 *	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)
4172
{
4173 4174 4175 4176 4177 4178 4179 4180 4181
	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 */
4182 4183 4184 4185 4186 4187 4188
			while (*++pattern && *pattern != ']' && *text != *pattern) {
				if (*pattern == '-' && *(pattern - 1) != '[')
					if (*text > *(pattern - 1) && *text < *(pattern + 1)) {
						++pattern;
						break;
					}
			}
4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203
			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 */
4204 4205
		}
	}
4206 4207 4208
	if (!*text && !*pattern)
		return 0;  /* End of both strings: match */
	return 1;  /* No match */
4209
}
4210

T
Tejun Heo 已提交
4211
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4212
{
T
Tejun Heo 已提交
4213 4214
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4215
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4216

T
Tejun Heo 已提交
4217 4218
	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
4219

4220
	while (ad->model_num) {
4221
		if (!glob_match(model_num, ad->model_num)) {
4222 4223
			if (ad->model_rev == NULL)
				return ad->horkage;
4224
			if (!glob_match(model_rev, ad->model_rev))
4225
				return ad->horkage;
4226
		}
4227
		ad++;
4228
	}
L
Linus Torvalds 已提交
4229 4230 4231
	return 0;
}

4232 4233 4234 4235 4236 4237
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
4238
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4239 4240
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4241
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4242 4243
}

A
Alan Cox 已提交
4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258
/**
 *	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);
}

4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276
/**
 *	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
4277
	/* If the controller thinks we are 40 wire, we are. */
4278 4279
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4280 4281

	/* If the controller thinks we are 80 wire, we are. */
4282 4283
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4284 4285 4286 4287 4288

	/* 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
4289 4290
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4291 4292 4293 4294 4295 4296 4297 4298 4299 4300

	/* 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
4301 4302 4303
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4304 4305 4306 4307 4308 4309
				return 0;
		}
	}
	return 1;
}

4310 4311 4312 4313
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4314 4315 4316 4317
 *	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...
4318 4319 4320 4321
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4322
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4323
{
T
Tejun Heo 已提交
4324 4325
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4326
	struct ata_host *host = ap->host;
4327
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4328

4329
	/* controller modes available */
4330 4331 4332
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4333
	/* drive modes available */
4334 4335 4336
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4337

4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348
	/*
	 *	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));
	}

4349 4350
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4351 4352
		ata_dev_warn(dev,
			     "device is on DMA blacklist, disabling DMA\n");
4353
	}
4354

4355
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4356
	    host->simplex_claimed && host->simplex_claimed != ap) {
4357
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4358 4359
		ata_dev_warn(dev,
			     "simplex DMA is claimed by other device, disabling DMA\n");
4360
	}
4361

J
Jeff Garzik 已提交
4362 4363 4364
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4365
	if (ap->ops->mode_filter)
4366
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4367

4368 4369 4370 4371 4372 4373 4374 4375 4376 4377
	/* 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 */
4378
		if (cable_is_40wire(ap)) {
4379 4380
			ata_dev_warn(dev,
				     "limited to UDMA/33 due to 40-wire cable\n");
4381 4382 4383
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4384 4385
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4386 4387 4388 4389 4390 4391
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4392 4393 4394
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4395
 *	LOCKING:
J
Jeff Garzik 已提交
4396
 *	PCI/etc. bus probe sem.
4397 4398 4399
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4400 4401
 */

T
Tejun Heo 已提交
4402
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4403
{
4404
	struct ata_taskfile tf;
4405
	unsigned int err_mask;
L
Linus Torvalds 已提交
4406 4407 4408 4409

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

T
Tejun Heo 已提交
4410 4411 4412
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4413
	ata_tf_init(dev, &tf);
4414 4415
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4416
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4417
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4418
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4419 4420
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4421 4422
	/* 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
4423
		tf.nsect = 0x01;
A
Alan Cox 已提交
4424 4425
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4426

4427
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4428 4429 4430 4431

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
4432

4433
/**
4434
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4435 4436
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4437
 *	@feature: The sector count represents the feature to set
4438 4439
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4440
 *	on port @ap with sector count
4441 4442 4443 4444 4445 4446 4447
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4448
unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460
{
	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;
4461
	tf.nsect = feature;
4462

4463
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4464

4465 4466
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4467 4468
}

4469 4470 4471
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4472 4473
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4474 4475
 *
 *	LOCKING:
4476 4477 4478 4479
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4480
 */
T
Tejun Heo 已提交
4481 4482
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4483
{
4484
	struct ata_taskfile tf;
4485
	unsigned int err_mask;
4486 4487 4488

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4489
		return AC_ERR_INVALID;
4490 4491 4492 4493

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

T
Tejun Heo 已提交
4494
	ata_tf_init(dev, &tf);
4495 4496 4497 4498 4499
	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 */
4500

4501
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4502 4503 4504 4505 4506
	/* 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;
4507

4508 4509
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4510 4511
}

L
Linus Torvalds 已提交
4512
/**
J
Jeff Garzik 已提交
4513 4514 4515 4516
 *	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
4517 4518
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4519
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4520
 */
4521
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4522 4523
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4524
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4525 4526
	int dir = qc->dma_dir;

4527
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4528

4529
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4530

4531
	if (qc->n_elem)
4532
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4533 4534

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4535
	qc->sg = NULL;
L
Linus Torvalds 已提交
4536 4537 4538
}

/**
4539
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4540 4541
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4542 4543 4544 4545
 *	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
4546
 *	LOCKING:
T
Tejun Heo 已提交
4547 4548 4549 4550 4551
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4552
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4553 4554
{
	struct ata_port *ap = qc->ap;
4555

T
Tejun Heo 已提交
4556 4557 4558
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4559 4560
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4561
		return 1;
4562

T
Tejun Heo 已提交
4563 4564
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4565

T
Tejun Heo 已提交
4566 4567
	return 0;
}
L
Linus Torvalds 已提交
4568

T
Tejun Heo 已提交
4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586
/**
 *	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;
4587

T
Tejun Heo 已提交
4588 4589 4590 4591 4592 4593 4594
	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;
	}
4595

T
Tejun Heo 已提交
4596 4597
	return ATA_DEFER_LINK;
}
4598

T
Tejun Heo 已提交
4599
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4600

T
Tejun Heo 已提交
4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620
/**
 *	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;
}
4621

T
Tejun Heo 已提交
4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638
/**
 *	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
4639

T
Tejun Heo 已提交
4640
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4641

T
Tejun Heo 已提交
4642 4643 4644
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4645

T
Tejun Heo 已提交
4646
	DPRINTK("%d sg elements mapped\n", n_elem);
4647
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4648 4649
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4650

T
Tejun Heo 已提交
4651
	return 0;
L
Linus Torvalds 已提交
4652 4653
}

T
Tejun Heo 已提交
4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666
/**
 *	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)
4667
{
T
Tejun Heo 已提交
4668 4669
#ifdef __BIG_ENDIAN
	unsigned int i;
4670

T
Tejun Heo 已提交
4671 4672 4673
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4674 4675
}

4676 4677
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4678
 *	@ap: target port
4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705
 *
 *	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
4706 4707 4708 4709 4710
/**
 *	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
4711
 *	None.
L
Linus Torvalds 已提交
4712 4713
 */

4714
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4715
{
T
Tejun Heo 已提交
4716
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4717 4718
	struct ata_queued_cmd *qc;

4719
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4720 4721 4722 4723 4724
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4725
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4726 4727 4728 4729 4730
	}

	return qc;
}

4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742
/**
 *	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)
{
4743
	struct ata_port *ap;
4744 4745
	unsigned int tag;

4746
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4747
	ap = qc->ap;
4748 4749 4750 4751 4752 4753 4754 4755 4756

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

4757
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4758
{
4759 4760
	struct ata_port *ap;
	struct ata_link *link;
4761

4762 4763
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4764 4765
	ap = qc->ap;
	link = qc->dev->link;
L
Linus Torvalds 已提交
4766 4767 4768 4769

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

4770
	/* command should be marked inactive atomically with qc completion */
4771
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4772
		link->sactive &= ~(1 << qc->tag);
4773 4774 4775
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4776
		link->active_tag = ATA_TAG_POISON;
4777 4778 4779 4780 4781 4782 4783
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4784

4785 4786 4787 4788 4789
	/* 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;
4790
	ap->qc_active &= ~(1 << qc->tag);
4791

L
Linus Torvalds 已提交
4792
	/* call completion callback */
4793
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4794 4795
}

4796 4797 4798 4799 4800
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4801
	ap->ops->qc_fill_rtf(qc);
4802 4803
}

4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816
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;
}

4817 4818 4819 4820
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
4821 4822 4823 4824 4825 4826 4827
 *	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.
4828 4829
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4830
 *	spin_lock_irqsave(host lock)
4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849
 */
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) {
4850 4851 4852
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4853 4854 4855
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

4856 4857 4858 4859 4860
		/*
		 * Finish internal commands without any further processing
		 * and always with the result TF filled.
		 */
		if (unlikely(ata_tag_internal(qc->tag))) {
4861
			fill_result_tf(qc);
4862 4863 4864
			__ata_qc_complete(qc);
			return;
		}
4865

4866 4867 4868 4869 4870 4871 4872
		/*
		 * 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);
4873
			return;
4874 4875
		}

4876 4877
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

4878 4879
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4880
			fill_result_tf(qc);
4881

4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896
		/* 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;
4897 4898 4899 4900

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4901 4902
		}

4903 4904 4905
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4906 4907 4908 4909 4910 4911 4912
		__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)
4913
			fill_result_tf(qc);
4914 4915 4916 4917 4918

		__ata_qc_complete(qc);
	}
}

4919 4920 4921 4922 4923 4924 4925 4926 4927 4928
/**
 *	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.
 *
4929 4930 4931 4932
 *	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.
 *
4933
 *	LOCKING:
J
Jeff Garzik 已提交
4934
 *	spin_lock_irqsave(host lock)
4935 4936 4937 4938
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4939
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4940 4941 4942 4943 4944 4945 4946
{
	int nr_done = 0;
	u32 done_mask;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
4947 4948
		ata_port_err(ap, "illegal qc_active transition (%08x->%08x)\n",
			     ap->qc_active, qc_active);
4949 4950 4951
		return -EINVAL;
	}

4952
	while (done_mask) {
4953
		struct ata_queued_cmd *qc;
4954
		unsigned int tag = __ffs(done_mask);
4955

4956 4957
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
4958 4959 4960
			ata_qc_complete(qc);
			nr_done++;
		}
4961
		done_mask &= ~(1 << tag);
4962 4963 4964 4965 4966
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4967 4968 4969 4970 4971 4972 4973 4974 4975 4976
/**
 *	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
4977
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4978
 */
4979
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4980 4981
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4982
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
4983
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
4984

4985 4986 4987 4988
	/* 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.
	 */
4989
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4990

4991
	if (ata_is_ncq(prot)) {
4992
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
4993 4994 4995

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
4996
		link->sactive |= 1 << qc->tag;
4997
	} else {
4998
		WARN_ON_ONCE(link->sactive);
4999 5000

		ap->nr_active_links++;
T
Tejun Heo 已提交
5001
		link->active_tag = qc->tag;
5002 5003
	}

5004
	qc->flags |= ATA_QCFLAG_ACTIVE;
5005
	ap->qc_active |= 1 << qc->tag;
5006

5007 5008
	/*
	 * We guarantee to LLDs that they will have at least one
5009 5010
	 * non-zero sg if the command is a data command.
	 */
5011 5012 5013
	if (WARN_ON_ONCE(ata_is_data(prot) &&
			 (!qc->sg || !qc->n_elem || !qc->nbytes)))
		goto sys_err;
5014

T
Tejun Heo 已提交
5015
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5016
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5017
		if (ata_sg_setup(qc))
5018
			goto sys_err;
L
Linus Torvalds 已提交
5019

T
Tejun Heo 已提交
5020
	/* if device is sleeping, schedule reset and abort the link */
5021
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5022
		link->eh_info.action |= ATA_EH_RESET;
5023 5024 5025 5026 5027
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5028 5029
	ap->ops->qc_prep(qc);

5030 5031 5032 5033
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5034

5035
sys_err:
5036 5037 5038
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5039 5040
}

5041 5042
/**
 *	sata_scr_valid - test whether SCRs are accessible
5043
 *	@link: ATA link to test SCR accessibility for
5044
 *
5045
 *	Test whether SCRs are accessible for @link.
5046 5047 5048 5049 5050 5051 5052
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5053
int sata_scr_valid(struct ata_link *link)
5054
{
5055 5056
	struct ata_port *ap = link->ap;

5057
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5058 5059 5060 5061
}

/**
 *	sata_scr_read - read SCR register of the specified port
5062
 *	@link: ATA link to read SCR for
5063 5064 5065
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5066
 *	Read SCR register @reg of @link into *@val.  This function is
5067 5068
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5069 5070
 *
 *	LOCKING:
5071
 *	None if @link is ap->link.  Kernel thread context otherwise.
5072 5073 5074 5075
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5076
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5077
{
5078 5079
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5080
			return link->ap->ops->scr_read(link, reg, val);
5081 5082 5083 5084
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5085 5086 5087 5088
}

/**
 *	sata_scr_write - write SCR register of the specified port
5089
 *	@link: ATA link to write SCR for
5090 5091 5092
 *	@reg: SCR to write
 *	@val: value to write
 *
5093
 *	Write @val to SCR register @reg of @link.  This function is
5094 5095
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5096 5097
 *
 *	LOCKING:
5098
 *	None if @link is ap->link.  Kernel thread context otherwise.
5099 5100 5101 5102
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5103
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5104
{
5105 5106
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5107
			return link->ap->ops->scr_write(link, reg, val);
5108 5109
		return -EOPNOTSUPP;
	}
5110

5111
	return sata_pmp_scr_write(link, reg, val);
5112 5113 5114 5115
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5116
 *	@link: ATA link to write SCR for
5117 5118 5119 5120 5121 5122 5123
 *	@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:
5124
 *	None if @link is ap->link.  Kernel thread context otherwise.
5125 5126 5127 5128
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5129
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5130
{
5131 5132
	if (ata_is_host_link(link)) {
		int rc;
5133

5134
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5135
			rc = link->ap->ops->scr_write(link, reg, val);
5136
			if (rc == 0)
T
Tejun Heo 已提交
5137
				rc = link->ap->ops->scr_read(link, reg, &val);
5138 5139 5140
			return rc;
		}
		return -EOPNOTSUPP;
5141
	}
5142 5143

	return sata_pmp_scr_write(link, reg, val);
5144 5145 5146
}

/**
T
Tejun Heo 已提交
5147
 *	ata_phys_link_online - test whether the given link is online
5148
 *	@link: ATA link to test
5149
 *
5150 5151 5152
 *	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).
5153 5154 5155 5156 5157
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5158
 *	True if the port online status is available and online.
5159
 */
T
Tejun Heo 已提交
5160
bool ata_phys_link_online(struct ata_link *link)
5161 5162 5163
{
	u32 sstatus;

5164
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5165
	    ata_sstatus_online(sstatus))
5166 5167
		return true;
	return false;
5168 5169 5170
}

/**
T
Tejun Heo 已提交
5171
 *	ata_phys_link_offline - test whether the given link is offline
5172
 *	@link: ATA link to test
5173
 *
5174 5175 5176
 *	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).
5177 5178 5179 5180 5181
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5182
 *	True if the port offline status is available and offline.
5183
 */
T
Tejun Heo 已提交
5184
bool ata_phys_link_offline(struct ata_link *link)
5185 5186 5187
{
	u32 sstatus;

5188
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5189
	    !ata_sstatus_online(sstatus))
5190 5191
		return true;
	return false;
5192
}
E
Edward Falk 已提交
5193

T
Tejun Heo 已提交
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 5237 5238 5239 5240 5241 5242 5243 5244 5245
/**
 *	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));
}

5246
#ifdef CONFIG_PM
L
Lin Ming 已提交
5247
static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
J
Jeff Garzik 已提交
5248 5249
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5250
{
L
Lin Ming 已提交
5251
	struct ata_link *link;
5252
	unsigned long flags;
L
Lin Ming 已提交
5253
	int rc;
5254

L
Lin Ming 已提交
5255 5256 5257 5258 5259 5260 5261
	/* 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);
	}
5262

L
Lin Ming 已提交
5263 5264
	/* request PM ops to EH */
	spin_lock_irqsave(ap->lock, flags);
5265

L
Lin Ming 已提交
5266 5267 5268 5269 5270
	ap->pm_mesg = mesg;
	if (wait) {
		rc = 0;
		ap->pm_result = &rc;
	}
5271

L
Lin Ming 已提交
5272 5273 5274 5275 5276
	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;
	}
5277

L
Lin Ming 已提交
5278
	ata_port_schedule_eh(ap);
5279

L
Lin Ming 已提交
5280
	spin_unlock_irqrestore(ap->lock, flags);
5281

L
Lin Ming 已提交
5282 5283 5284 5285
	/* wait and check result */
	if (wait) {
		ata_port_wait_eh(ap);
		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5286 5287
	}

L
Lin Ming 已提交
5288
	return rc;
5289 5290
}

L
Lin Ming 已提交
5291 5292
#define to_ata_port(d) container_of(d, struct ata_port, tdev)

L
Lin Ming 已提交
5293
static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
L
Lin Ming 已提交
5294 5295
{
	struct ata_port *ap = to_ata_port(dev);
L
Lin Ming 已提交
5296
	unsigned int ehi_flags = ATA_EHI_QUIET;
L
Lin Ming 已提交
5297 5298
	int rc;

L
Lin Ming 已提交
5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310
	/*
	 * 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
5311 5312 5313 5314 5315 5316 5317 5318
	return rc;
}

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

L
Lin Ming 已提交
5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335
	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
5336 5337
}

5338
static int ata_port_resume_common(struct device *dev)
L
Lin Ming 已提交
5339 5340 5341 5342 5343 5344 5345 5346 5347
{
	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;
}

5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361
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;
}

5362 5363 5364 5365 5366
static int ata_port_runtime_idle(struct device *dev)
{
	return pm_runtime_suspend(dev);
}

L
Lin Ming 已提交
5367 5368 5369
static const struct dev_pm_ops ata_port_pm_ops = {
	.suspend = ata_port_suspend,
	.resume = ata_port_resume,
L
Lin Ming 已提交
5370 5371 5372 5373
	.freeze = ata_port_do_freeze,
	.thaw = ata_port_resume,
	.poweroff = ata_port_poweroff,
	.restore = ata_port_resume,
5374

L
Lin Ming 已提交
5375
	.runtime_suspend = ata_port_suspend,
5376
	.runtime_resume = ata_port_resume_common,
5377
	.runtime_idle = ata_port_runtime_idle,
L
Lin Ming 已提交
5378 5379
};

5380
/**
J
Jeff Garzik 已提交
5381 5382
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5383 5384
 *	@mesg: PM message
 *
L
Lin Ming 已提交
5385
 *	Suspend @host.  Actual operation is performed by port suspend.
5386
 */
J
Jeff Garzik 已提交
5387
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5388
{
L
Lin Ming 已提交
5389 5390
	host->dev->power.power_state = mesg;
	return 0;
5391 5392 5393
}

/**
J
Jeff Garzik 已提交
5394 5395
 *	ata_host_resume - resume host
 *	@host: host to resume
5396
 *
L
Lin Ming 已提交
5397
 *	Resume @host.  Actual operation is performed by port resume.
5398
 */
J
Jeff Garzik 已提交
5399
void ata_host_resume(struct ata_host *host)
5400
{
5401
	host->dev->power.power_state = PMSG_ON;
5402
}
5403
#endif
5404

L
Lin Ming 已提交
5405 5406 5407 5408 5409 5410 5411
struct device_type ata_port_type = {
	.name = "ata_port",
#ifdef CONFIG_PM
	.pm = &ata_port_pm_ops,
#endif
};

5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422
/**
 *	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
5423
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5424
	struct ata_port *ap = link->ap;
5425 5426
	unsigned long flags;

T
Tejun Heo 已提交
5427
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5428 5429
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5430

5431 5432
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5433
	 * host lock.
5434
	 */
5435
	spin_lock_irqsave(ap->lock, flags);
5436
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5437
	dev->horkage = 0;
5438
	spin_unlock_irqrestore(ap->lock, flags);
5439

5440 5441
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5442 5443 5444 5445 5446
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5447 5448 5449 5450
/**
 *	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
5451
 *	@pmp: Port multiplier port number
5452 5453 5454 5455 5456 5457
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5458
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5459 5460 5461 5462
{
	int i;

	/* clear everything except for devices */
G
Gwendal Grignou 已提交
5463 5464
	memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
	       ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5465 5466

	link->ap = ap;
T
Tejun Heo 已提交
5467
	link->pmp = pmp;
5468 5469 5470 5471 5472 5473 5474 5475 5476
	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
5477 5478 5479
#ifdef CONFIG_ATA_ACPI
		dev->gtf_filter = ata_acpi_gtf_filter;
#endif
5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496
		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.
 */
5497
int sata_link_init_spd(struct ata_link *link)
5498
{
5499
	u8 spd;
5500 5501
	int rc;

T
Tejun Heo 已提交
5502
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5503 5504 5505
	if (rc)
		return rc;

T
Tejun Heo 已提交
5506
	spd = (link->saved_scontrol >> 4) & 0xf;
5507 5508 5509
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5510
	ata_force_link_limits(link);
5511

5512 5513 5514 5515 5516
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5517
/**
5518 5519
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5520
 *
5521 5522 5523 5524
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5525
 *
L
Linus Torvalds 已提交
5526
 *	LOCKING:
5527
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5528
 */
5529
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5530
{
5531
	struct ata_port *ap;
L
Linus Torvalds 已提交
5532

5533 5534 5535 5536 5537
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;
5538

5539
	ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
J
Jeff Garzik 已提交
5540
	ap->lock = &host->lock;
5541
	ap->print_id = -1;
J
Jeff Garzik 已提交
5542
	ap->host = host;
5543
	ap->dev = host->dev;
5544 5545 5546 5547 5548 5549

#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
5550
#else
5551
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5552
#endif
L
Linus Torvalds 已提交
5553

5554
	mutex_init(&ap->scsi_scan_mutex);
5555 5556
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5557
	INIT_LIST_HEAD(&ap->eh_done_q);
5558
	init_waitqueue_head(&ap->eh_wait_q);
5559
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5560 5561 5562
	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
5563

5564 5565
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5566
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5567 5568 5569 5570 5571

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
5572 5573
	ata_sff_port_init(ap);

L
Linus Torvalds 已提交
5574 5575 5576
	return ap;
}

5577 5578 5579 5580 5581
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5582 5583 5584
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5585 5586 5587 5588
		if (!ap)
			continue;

		if (ap->scsi_host)
5589 5590
			scsi_host_put(ap->scsi_host);

5591
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5592
		kfree(ap->slave_link);
5593
		kfree(ap);
5594 5595 5596
		host->ports[i] = NULL;
	}

5597
	dev_set_drvdata(gendev, NULL);
5598 5599
}

5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641
/**
 *	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);
5642
	mutex_init(&host->eh_mutex);
5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665
	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;
}

5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703
/**
 *	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;
5704
		ap->link.flags |= pi->link_flags;
5705 5706 5707 5708 5709 5710 5711 5712 5713
		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
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 5767 5768 5769 5770 5771 5772 5773 5774 5775
/**
 *	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;
}

5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793
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);
}

5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815
/**
 *	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)
{
5816
	static DEFINE_SPINLOCK(lock);
5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843
	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);
}

5844 5845 5846 5847 5848 5849 5850
/**
 *	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
5851 5852
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5853 5854 5855 5856 5857 5858 5859 5860 5861
 *
 *	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)
{
5862 5863
	int have_stop = 0;
	void *start_dr = NULL;
5864 5865 5866 5867 5868
	int i, rc;

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

5869 5870
	ata_finalize_port_ops(host->ops);

5871 5872 5873
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5874 5875
		ata_finalize_port_ops(ap->ops);

5876 5877 5878
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894
		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];

5895 5896 5897
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5898
				if (rc != -ENODEV)
5899 5900 5901
					dev_err(host->dev,
						"failed to start port %d (errno=%d)\n",
						i, rc);
5902 5903 5904 5905 5906 5907
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5908 5909
	if (start_dr)
		devres_add(host->dev, start_dr);
5910 5911 5912 5913 5914 5915 5916 5917 5918 5919
	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);
	}
5920
	devres_free(start_dr);
5921 5922 5923
	return rc;
}

5924
/**
J
Jeff Garzik 已提交
5925 5926 5927 5928 5929
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5930 5931 5932 5933 5934
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5935
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5936
void ata_host_init(struct ata_host *host, struct device *dev,
5937
		   unsigned long flags, struct ata_port_operations *ops)
5938
{
J
Jeff Garzik 已提交
5939
	spin_lock_init(&host->lock);
5940
	mutex_init(&host->eh_mutex);
J
Jeff Garzik 已提交
5941 5942 5943
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5944 5945
}

D
Dan Williams 已提交
5946
void __ata_port_probe(struct ata_port *ap)
5947
{
D
Dan Williams 已提交
5948 5949
	struct ata_eh_info *ehi = &ap->link.eh_info;
	unsigned long flags;
5950

D
Dan Williams 已提交
5951 5952
	/* kick EH for boot probing */
	spin_lock_irqsave(ap->lock, flags);
5953

D
Dan Williams 已提交
5954 5955 5956
	ehi->probe_mask |= ATA_ALL_DEVICES;
	ehi->action |= ATA_EH_RESET;
	ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5957

D
Dan Williams 已提交
5958 5959 5960
	ap->pflags &= ~ATA_PFLAG_INITIALIZING;
	ap->pflags |= ATA_PFLAG_LOADING;
	ata_port_schedule_eh(ap);
5961

D
Dan Williams 已提交
5962 5963
	spin_unlock_irqrestore(ap->lock, flags);
}
5964

D
Dan Williams 已提交
5965 5966 5967
int ata_port_probe(struct ata_port *ap)
{
	int rc = 0;
5968

D
Dan Williams 已提交
5969 5970
	if (ap->ops->error_handler) {
		__ata_port_probe(ap);
5971 5972 5973 5974 5975 5976
		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);
	}
5977 5978 5979 5980 5981 5982 5983
	return rc;
}


static void async_port_probe(void *data, async_cookie_t cookie)
{
	struct ata_port *ap = data;
5984

5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995
	/*
	 * 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);
5996 5997 5998 5999 6000

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

	ata_scsi_scan_host(ap, 1);
6001
}
6002

6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024
/**
 *	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)) {
6025
		dev_err(host->dev, "BUG: trying to register unstarted host\n");
6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038
		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++)
D
Dan Williams 已提交
6039
		host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
6040

6041

G
Gwendal Grignou 已提交
6042 6043 6044 6045 6046 6047 6048 6049
	/* 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;
		}
	}

6050 6051
	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
G
Gwendal Grignou 已提交
6052
		goto err_tadd;
6053

6054 6055 6056
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6057 6058 6059 6060 6061 6062 6063 6064 6065 6066
	/* 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 */
6067
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6068 6069
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6070

6071
		/* print per-port info to dmesg */
6072 6073 6074
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6075
		if (!ata_port_is_dummy(ap)) {
6076 6077 6078 6079
			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);
6080 6081
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6082
			ata_port_info(ap, "DUMMY\n");
6083 6084
	}

V
Vegard Nossum 已提交
6085
	/* perform each probe asynchronously */
6086 6087
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6088
		async_schedule(async_port_probe, ap);
6089 6090 6091
	}

	return 0;
G
Gwendal Grignou 已提交
6092 6093 6094 6095 6096 6097 6098

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

6099 6100
}

6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113
/**
 *	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.
 *
6114 6115 6116 6117
 *	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.
 *
6118 6119 6120 6121 6122 6123 6124 6125 6126 6127
 *	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)
{
6128
	int i, rc;
6129 6130 6131 6132 6133

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

6134 6135 6136 6137 6138 6139
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6140 6141 6142 6143 6144
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6145 6146
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6147

6148 6149 6150 6151 6152 6153 6154 6155
	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;
}

6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166
/**
 *	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).
 */
6167
static void ata_port_detach(struct ata_port *ap)
6168 6169 6170 6171
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6172
		goto skip_eh;
6173 6174

	/* tell EH we're leaving & flush EH */
6175
	spin_lock_irqsave(ap->lock, flags);
6176
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6177
	ata_port_schedule_eh(ap);
6178
	spin_unlock_irqrestore(ap->lock, flags);
6179

T
Tejun Heo 已提交
6180
	/* wait till EH commits suicide */
6181 6182
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6183 6184
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6185

6186
	cancel_delayed_work_sync(&ap->hotplug_task);
6187

6188
 skip_eh:
G
Gwendal Grignou 已提交
6189 6190 6191 6192 6193 6194 6195
	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);

6196
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6197
	scsi_remove_host(ap->scsi_host);
6198 6199
}

T
Tejun Heo 已提交
6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214
/**
 *	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]);
6215 6216 6217

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6218 6219
}

6220 6221
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6222 6223 6224 6225
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6226 6227 6228
 *	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
6229 6230 6231 6232
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6233
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6234
{
6235
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6236
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6237

T
Tejun Heo 已提交
6238
	ata_host_detach(host);
L
Linus Torvalds 已提交
6239 6240 6241
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6242
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273
{
	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
6274

6275
#ifdef CONFIG_PM
6276
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6277 6278
{
	pci_save_state(pdev);
6279
	pci_disable_device(pdev);
6280

6281
	if (mesg.event & PM_EVENT_SLEEP)
6282
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6283 6284
}

6285
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6286
{
6287 6288
	int rc;

J
Jens Axboe 已提交
6289 6290
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6291

T
Tejun Heo 已提交
6292
	rc = pcim_enable_device(pdev);
6293
	if (rc) {
6294 6295
		dev_err(&pdev->dev,
			"failed to enable device after resume (%d)\n", rc);
6296 6297 6298
		return rc;
	}

J
Jens Axboe 已提交
6299
	pci_set_master(pdev);
6300
	return 0;
6301 6302
}

6303
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6304
{
J
Jeff Garzik 已提交
6305
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6306 6307
	int rc = 0;

J
Jeff Garzik 已提交
6308
	rc = ata_host_suspend(host, mesg);
6309 6310 6311
	if (rc)
		return rc;

6312
	ata_pci_device_do_suspend(pdev, mesg);
6313 6314 6315 6316 6317 6318

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6319
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6320
	int rc;
6321

6322 6323 6324 6325
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6326
}
6327 6328
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6329 6330
#endif /* CONFIG_PCI */

6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350
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 },
6351
		{ "dump_id",	.horkage_on	= ATA_HORKAGE_DUMP_ID },
6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385
		{ "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) },
6386 6387 6388
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
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 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508
	};
	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
6509 6510 6511

static int __init ata_init(void)
{
G
Gwendal Grignou 已提交
6512
	int rc;
6513

6514 6515
	ata_parse_force_param();

6516
	rc = ata_sff_init();
6517 6518 6519 6520
	if (rc) {
		kfree(ata_force_tbl);
		return rc;
	}
6521

G
Gwendal Grignou 已提交
6522 6523 6524 6525 6526 6527
	libata_transport_init();
	ata_scsi_transport_template = ata_attach_transport();
	if (!ata_scsi_transport_template) {
		ata_sff_exit();
		rc = -ENOMEM;
		goto err_out;
6528
	}
G
Gwendal Grignou 已提交
6529

L
Linus Torvalds 已提交
6530 6531
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
G
Gwendal Grignou 已提交
6532 6533 6534

err_out:
	return rc;
L
Linus Torvalds 已提交
6535 6536 6537 6538
}

static void __exit ata_exit(void)
{
G
Gwendal Grignou 已提交
6539 6540
	ata_release_transport(ata_scsi_transport_template);
	libata_transport_exit();
6541
	ata_sff_exit();
6542
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6543 6544
}

6545
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6546 6547
module_exit(ata_exit);

A
Akinobu Mita 已提交
6548
static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
6549 6550 6551

int ata_ratelimit(void)
{
A
Akinobu Mita 已提交
6552
	return __ratelimit(&ratelimit);
6553 6554
}

6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568
/**
 *	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.
 */
6569 6570
void ata_msleep(struct ata_port *ap, unsigned int msecs)
{
6571 6572 6573 6574 6575
	bool owns_eh = ap && ap->host->eh_owner == current;

	if (owns_eh)
		ata_eh_release(ap);

6576
	msleep(msecs);
6577 6578 6579

	if (owns_eh)
		ata_eh_acquire(ap);
6580 6581
}

6582 6583
/**
 *	ata_wait_register - wait until register value changes
6584
 *	@ap: ATA port to wait register for, can be NULL
6585 6586 6587
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6588 6589
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605
 *
 *	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.
 */
6606
u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
6607
		      unsigned long interval, unsigned long timeout)
6608
{
6609
	unsigned long deadline;
6610 6611 6612 6613 6614 6615 6616 6617
	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.
	 */
6618
	deadline = ata_deadline(jiffies, timeout);
6619

6620
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6621
		ata_msleep(ap, interval);
6622 6623 6624 6625 6626 6627
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6628 6629 6630
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6631
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6632
{
T
Tejun Heo 已提交
6633
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6634 6635
}

T
Tejun Heo 已提交
6636
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6637
{
T
Tejun Heo 已提交
6638
	/* truly dummy */
T
Tejun Heo 已提交
6639 6640
}

6641
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6642 6643
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6644
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6645 6646
};

6647 6648 6649 6650
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

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 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720
/*
 * 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);

6721 6722 6723 6724 6725 6726
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
6727 6728 6729 6730 6731 6732
/*
 * 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.
 */
6733 6734 6735
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6736 6737
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6738
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6739
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6740 6741
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6742
EXPORT_SYMBOL_GPL(ata_std_bios_param);
6743
EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
J
Jeff Garzik 已提交
6744
EXPORT_SYMBOL_GPL(ata_host_init);
6745
EXPORT_SYMBOL_GPL(ata_host_alloc);
6746
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6747
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6748
EXPORT_SYMBOL_GPL(ata_host_start);
6749
EXPORT_SYMBOL_GPL(ata_host_register);
6750
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6751
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6752
EXPORT_SYMBOL_GPL(ata_sg_init);
6753
EXPORT_SYMBOL_GPL(ata_qc_complete);
6754
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6755
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6756 6757
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6758 6759 6760 6761 6762 6763 6764
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);
6765
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6766
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6767
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6768
EXPORT_SYMBOL_GPL(ata_dev_disable);
6769
EXPORT_SYMBOL_GPL(sata_set_spd);
6770
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6771 6772
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6773
EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
6774
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6775
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6776
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6777
EXPORT_SYMBOL_GPL(ata_std_postreset);
6778 6779
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
6780
EXPORT_SYMBOL_GPL(ata_ratelimit);
6781
EXPORT_SYMBOL_GPL(ata_msleep);
6782
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6783 6784
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6785
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6786
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6787
EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
6788 6789 6790 6791
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);
6792 6793
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6794
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6795 6796
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6797
#endif /* CONFIG_PM */
6798 6799
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6800
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6801 6802
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6803
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6804
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6805 6806
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6807
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6808

L
Linus Torvalds 已提交
6809 6810 6811
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6812
#ifdef CONFIG_PM
6813 6814
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6815 6816
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6817
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6818
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6819

T
Tejun Heo 已提交
6820 6821 6822
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6823 6824 6825 6826
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6827
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6828
EXPORT_SYMBOL_GPL(ata_link_abort);
6829
EXPORT_SYMBOL_GPL(ata_port_abort);
6830
EXPORT_SYMBOL_GPL(ata_port_freeze);
6831
EXPORT_SYMBOL_GPL(sata_async_notification);
6832 6833
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6834 6835
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6836
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6837
EXPORT_SYMBOL_GPL(ata_do_eh);
6838
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6839 6840 6841 6842

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6843
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6844
EXPORT_SYMBOL_GPL(ata_cable_sata);