libata-core.c 173.6 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.h>
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#include <linux/log2.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/byteorder.h>
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#include <linux/cdrom.h>
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#include "libata.h"

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

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

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

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

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struct workqueue_struct *ata_aux_wq;

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

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

static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;

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

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static int atapi_enabled = 1;
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module_param(atapi_enabled, int, 0444);
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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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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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

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

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

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

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	return NULL;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	case GPCMD_READ_CD:
	case GPCMD_READ_CD_MSF:
		return ATAPI_READ_CD;

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

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

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

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

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

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

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

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

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

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

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

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

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static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
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	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
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	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
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	0,
	0,
	0,
	0,
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	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
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	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
632
};
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/**
635
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
636 637
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
639
 *	Examine the device configuration and tf->flags to calculate
640
 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
645
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)) {
659 660
		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
661
		index = dev->multi_count ? 0 : 8;
662 663
	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
665
	}
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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;
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
		} else
			block |= (tf->device & 0xf) << 24;

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

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

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

	return block;
}

718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744
/**
 *	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;

745
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
		/* 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.
 */
856 857 858
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
859 860 861 862 863 864
{
	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);
}

865 866 867 868 869 870 871 872 873 874
/**
 *	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.
 */
875 876
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
877 878 879 880 881 882 883 884 885
{
	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;
}

886
static const struct ata_xfer_ent {
887
	int shift, bits;
888 889
	u8 base;
} ata_xfer_tbl[] = {
890 891 892
	{ 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:
907
 *	Matching XFER_* value, 0xff if no match found.
908
 */
909
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
910 911 912 913 914 915 916
{
	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;
917
	return 0xff;
918 919 920 921 922 923 924 925 926 927 928 929 930 931
}

/**
 *	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.
 */
932
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
933 934 935 936 937
{
	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)
938 939
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
	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.
 */
955
int ata_xfer_mode2shift(unsigned long xfer_mode)
956 957 958 959 960 961 962 963 964
{
	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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/**
966 967
 *	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
970
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
977
 *	@mode_mask, or the constant C string "<n/a>".
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 */
979
const char *ata_mode_string(unsigned long xfer_mask)
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{
981 982 983 984 985 986
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
987 988
		"PIO5",
		"PIO6",
989 990 991
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
992 993
		"MWDMA3",
		"MWDMA4",
994 995 996 997 998 999 1000 1001 1002
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
1003
	int highbit;
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1005 1006 1007
	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>";
}

1011 1012 1013 1014 1015
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1016
		"6.0 Gbps",
1017 1018 1019 1020 1021 1022 1023
	};

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

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
{
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
	u32 scontrol;
	unsigned int err_mask;
	int rc;

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

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

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

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

1080 1081 1082 1083 1084
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
1085 1086 1087 1088 1089 1090 1091 1092 1093
		break;
	case NOT_AVAILABLE:
	case MAX_PERFORMANCE:
		/* disable all IPM transitions */
		scontrol |= (0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

1094 1095 1096 1097 1098
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109
		break;
	}

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

	return 0;
}

/**
 *	ata_dev_enable_pm - enable SATA interface power management
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 *	@dev:  device to enable power management
 *	@policy: the link power management policy
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
 *
 *	Enable SATA Interface power management.  This will enable
 *	Device Interface Power Management (DIPM) for min_power
 * 	policy, and then call driver specific callbacks for
 *	enabling Host Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: -EINVAL if IPM is not supported, 0 otherwise.
 */
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
{
	int rc = 0;
	struct ata_port *ap = dev->link->ap;

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

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

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#ifdef CONFIG_PM
1142 1143
/**
 *	ata_dev_disable_pm - disable SATA interface power management
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 *	@dev: device to disable power management
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
 *
 *	Disable SATA Interface power management.  This will disable
 *	Device Interface Power Management (DIPM) without changing
 * 	policy,  call driver specific callbacks for disabling Host
 * 	Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: void
 */
static void ata_dev_disable_pm(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	ata_dev_set_dipm(dev, MAX_PERFORMANCE);
	if (ap->ops->disable_pm)
		ap->ops->disable_pm(ap);
}
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#endif	/* CONFIG_PM */
1163 1164 1165 1166

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1167
	ap->link.eh_info.action |= ATA_EH_LPM;
1168 1169 1170 1171
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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1172
#ifdef CONFIG_PM
1173 1174 1175 1176 1177 1178 1179 1180 1181
static void ata_lpm_enable(struct ata_host *host)
{
	struct ata_link *link;
	struct ata_port *ap;
	struct ata_device *dev;
	int i;

	for (i = 0; i < host->n_ports; i++) {
		ap = host->ports[i];
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		ata_for_each_link(link, ap, EDGE) {
			ata_for_each_dev(dev, link, ALL)
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
				ata_dev_disable_pm(dev);
		}
	}
}

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

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		ata_lpm_schedule(ap, ap->pm_policy);
	}
}
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#endif	/* CONFIG_PM */
1199

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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:
1212 1213
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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Linus Torvalds 已提交
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 */
J
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
Linus Torvalds 已提交
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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.
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
	 *
	 * 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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Tejun Heo 已提交
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	 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
	 * SEMB signature.  This is worked around in
	 * ata_dev_read_id().
L
Linus Torvalds 已提交
1237
	 */
1238
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1243
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1248 1249 1250 1251 1252 1253
	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;
1256 1257
	}

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

/**
1263
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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Linus Torvalds 已提交
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
 *	@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.
 */

1277 1278
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
Linus Torvalds 已提交
1279 1280 1281
{
	unsigned int c;

1282 1283
	BUG_ON(len & 1);

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

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

		ofs++;
		len -= 2;
	}
}

1298
/**
1299
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1300 1301 1302 1303 1304
 *	@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.
 *
1305
 *	This function is identical to ata_id_string except that it
1306 1307 1308 1309 1310 1311
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1312 1313
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1314 1315 1316
{
	unsigned char *p;

1317
	ata_id_string(id, s, ofs, len - 1);
1318 1319 1320 1321 1322 1323

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1329
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
T
Tejun Heo 已提交
1330
		else
1331
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
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1332 1333
	} else {
		if (ata_id_current_chs_valid(id))
1334 1335
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
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1336
		else
1337 1338
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
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	}
}

1342
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
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{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1348
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
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	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1353
	return sectors;
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}

1356
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
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1357 1358 1359 1360 1361 1362 1363 1364
{
	u64 sectors = 0;

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

1365
	return sectors;
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}

/**
1369 1370 1371
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
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 *
1373 1374
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
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 *
1376 1377 1378
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
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 */
1380
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
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1381
{
1382
	unsigned int err_mask;
A
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1383
	struct ata_taskfile tf;
1384
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1385 1386 1387

	ata_tf_init(dev, &tf);

1388
	/* always clear all address registers */
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	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1391 1392 1393 1394 1395
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
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	tf.protocol |= ATA_PROT_NODATA;
1398 1399
	tf.device |= ATA_LBA;

1400
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1401 1402 1403 1404 1405 1406 1407
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
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1409
	if (lba48)
1410
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1411
	else
1412
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1413
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1414
		(*max_sectors)--;
1415
	return 0;
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1416 1417 1418
}

/**
1419 1420
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
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Randy Dunlap 已提交
1421
 *	@new_sectors: new max sectors value to set for the device
A
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 *
1423 1424 1425 1426 1427 1428
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
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 */
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1430
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
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1431
{
1432
	unsigned int err_mask;
A
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1433
	struct ata_taskfile tf;
1434
	int lba48 = ata_id_has_lba48(dev->id);
A
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1435 1436 1437 1438 1439 1440

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1441 1442 1443 1444 1445 1446 1447 1448

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

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
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1449
	} else {
1450 1451
		tf.command = ATA_CMD_SET_MAX;

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

A
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1455
	tf.protocol |= ATA_PROT_NODATA;
1456
	tf.device |= ATA_LBA;
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1457 1458 1459 1460 1461

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

1462
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
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}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
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 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
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1485
 */
T
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1486
static int ata_hpa_resize(struct ata_device *dev)
A
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1487
{
T
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	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1492
	int rc;
J
Jeff Garzik 已提交
1493

T
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1494 1495 1496 1497
	/* 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))
1498
		return 0;
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1500 1501 1502
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
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1503 1504
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
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1505
		 */
T
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1506
		if (rc == -EACCES || !ata_ignore_hpa) {
T
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1507
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1508
				       "broken, skipping HPA handling\n");
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1509 1510 1511 1512 1513
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
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1514
		}
T
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1515

T
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1516 1517
		return rc;
	}
T
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1518
	dev->n_native_sectors = native_sectors;
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1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569

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

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

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

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

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

	return 0;
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1570 1571
}

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

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

1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
1626
unsigned long ata_id_xfermask(const u16 *id)
1627
{
1628
	unsigned long pio_mask, mwdma_mask, udma_mask;
1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1640
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1641
		if (mode < 5)	/* Valid PIO range */
1642
			pio_mask = (2 << mode) - 1;
1643 1644
		else
			pio_mask = 1;
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654

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

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1655

1656 1657 1658 1659
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
S
Sergei Shtylyov 已提交
1660 1661
		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672

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

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

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1680
/**
1681
 *	ata_pio_queue_task - Queue port_task
T
Tejun Heo 已提交
1682
 *	@ap: The ata_port to queue port_task for
1683
 *	@data: data for @fn to use
1684
 *	@delay: delay time in msecs for workqueue function
T
Tejun Heo 已提交
1685 1686 1687 1688 1689 1690 1691
 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
1692
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
T
Tejun Heo 已提交
1693 1694 1695 1696 1697
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
1698
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1699
{
1700
	ap->port_task_data = data;
T
Tejun Heo 已提交
1701

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

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

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

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

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

	complete(waiting);
}

/**
1734
 *	ata_exec_internal_sg - execute libata internal command
1735 1736
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1737
 *	@cdb: CDB for packet command
1738
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1739
 *	@sgl: sg list for the data buffer of the command
1740
 *	@n_elem: Number of sg entries
1741
 *	@timeout: Timeout in msecs (0 for default)
1742 1743 1744 1745 1746 1747 1748 1749 1750
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1751 1752 1753
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1754
 */
1755 1756
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1757
			      int dma_dir, struct scatterlist *sgl,
1758
			      unsigned int n_elem, unsigned long timeout)
1759
{
T
Tejun Heo 已提交
1760 1761
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1762
	u8 command = tf->command;
1763
	int auto_timeout = 0;
1764
	struct ata_queued_cmd *qc;
1765
	unsigned int tag, preempted_tag;
1766
	u32 preempted_sactive, preempted_qc_active;
1767
	int preempted_nr_active_links;
1768
	DECLARE_COMPLETION_ONSTACK(wait);
1769
	unsigned long flags;
1770
	unsigned int err_mask;
1771
	int rc;
1772

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

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

1781
	/* initialize internal qc */
1782

1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

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

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

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

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

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

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

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

1832
	ata_qc_issue(qc);
1833

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

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

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

	ata_port_flush_task(ap);
1848

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

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

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

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

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

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

1877 1878 1879 1880 1881 1882 1883 1884 1885 1886
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

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

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1887 1888
	}

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

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

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

1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1912
	if (ap->flags & ATA_FLAG_DISABLED) {
1913 1914 1915 1916
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

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

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

1922
	return err_mask;
1923 1924
}

1925
/**
1926
 *	ata_exec_internal - execute libata internal command
1927 1928 1929 1930 1931 1932
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
1933
 *	@timeout: Timeout in msecs (0 for default)
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
1946 1947
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1948
{
1949 1950
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1951

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

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

1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1976
 */
1977
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1978 1979 1980 1981 1982 1983 1984 1985 1986
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

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

1990 1991 1992 1993 1994 1995 1996 1997 1998
/**
 *	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
1999 2000 2001 2002 2003 2004 2005 2006 2007
	/* 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
2008
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
2009
		return 0;
2010 2011 2012 2013
	/* 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
2014 2015 2016 2017 2018
	/* 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))
2019
		return 1;
A
Alan Cox 已提交
2020 2021
	return 0;
}
2022

A
Alan Cox 已提交
2023 2024 2025 2026 2027 2028 2029 2030 2031
/**
 *	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)
{
2032 2033
	/* 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
2034
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
2035 2036 2037 2038
		/* 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
2039 2040
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
2041 2042
		}
	}
A
Alan Cox 已提交
2043
	return 3 << ATA_SHIFT_PIO;
2044 2045
}

2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062
/**
 *	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
2063
/**
2064 2065 2066
 *	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)
2067
 *	@flags: ATA_READID_* flags
2068
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
2069
 *
2070 2071
 *	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
2072 2073
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
2074
 *
2075
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2076
 *	now we abort if we hit that case.
2077
 *
L
Linus Torvalds 已提交
2078
 *	LOCKING:
2079 2080 2081 2082
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2083
 */
2084
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2085
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
2086
{
T
Tejun Heo 已提交
2087
	struct ata_port *ap = dev->link->ap;
2088
	unsigned int class = *p_class;
2089
	struct ata_taskfile tf;
2090 2091
	unsigned int err_mask = 0;
	const char *reason;
T
Tejun Heo 已提交
2092
	bool is_semb = class == ATA_DEV_SEMB;
2093
	int may_fallback = 1, tried_spinup = 0;
2094
	int rc;
L
Linus Torvalds 已提交
2095

2096
	if (ata_msg_ctl(ap))
2097
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2098

2099
retry:
T
Tejun Heo 已提交
2100
	ata_tf_init(dev, &tf);
2101

2102
	switch (class) {
T
Tejun Heo 已提交
2103 2104
	case ATA_DEV_SEMB:
		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
2105
	case ATA_DEV_ATA:
2106
		tf.command = ATA_CMD_ID_ATA;
2107 2108
		break;
	case ATA_DEV_ATAPI:
2109
		tf.command = ATA_CMD_ID_ATAPI;
2110 2111 2112 2113 2114
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
2115 2116
	}

2117
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127

	/* 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
2128

2129 2130 2131 2132 2133
	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);

2134
	if (err_mask) {
2135
		if (err_mask & AC_ERR_NODEV_HINT) {
2136 2137
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
2138 2139 2140
			return -ENOENT;
		}

T
Tejun Heo 已提交
2141 2142 2143 2144 2145 2146 2147 2148
		if (is_semb) {
			ata_dev_printk(dev, KERN_INFO, "IDENTIFY failed on "
				       "device w/ SEMB sig, disabled\n");
			/* SEMB is not supported yet */
			*p_class = ATA_DEV_SEMB_UNSUP;
			return 0;
		}

2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171
		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			/* Device or controller might have reported
			 * the wrong device class.  Give a shot at the
			 * other IDENTIFY if the current one is
			 * aborted by the device.
			 */
			if (may_fallback) {
				may_fallback = 0;

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

			/* Control reaches here iff the device aborted
			 * both flavors of IDENTIFYs which happens
			 * sometimes with phantom devices.
			 */
			ata_dev_printk(dev, KERN_DEBUG,
				       "both IDENTIFYs aborted, assuming NODEV\n");
			return -ENOENT;
2172 2173
		}

2174 2175
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
2176 2177 2178
		goto err_out;
	}

2179 2180 2181 2182 2183
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

2184
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
2185

2186
	/* sanity check */
2187
	rc = -EINVAL;
A
Alan Cox 已提交
2188
	reason = "device reports invalid type";
2189 2190 2191 2192 2193 2194 2195

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
2196 2197
	}

2198 2199 2200 2201 2202 2203 2204
	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.
		 */
2205
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2206
		if (err_mask && id[2] != 0x738c) {
2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218
			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;
	}

2219
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2220 2221 2222
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2223 2224
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2225 2226
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2227 2228 2229
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2230 2231
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2232
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2233 2234 2235 2236 2237 2238 2239 2240 2241
			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.
			 */
2242
			flags &= ~ATA_READID_POSTRESET;
2243 2244 2245 2246 2247
			goto retry;
		}
	}

	*p_class = class;
2248

2249 2250 2251
	return 0;

 err_out:
T
Tejun Heo 已提交
2252
	if (ata_msg_warn(ap))
2253
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2254
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2255 2256 2257
	return rc;
}

2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
static int ata_do_link_spd_horkage(struct ata_device *dev)
{
	struct ata_link *plink = ata_dev_phys_link(dev);
	u32 target, target_limit;

	if (!sata_scr_valid(plink))
		return 0;

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

	target_limit = (1 << target) - 1;

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

	plink->sata_spd_limit = target_limit;

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

T
Tejun Heo 已提交
2292
static inline u8 ata_dev_knobble(struct ata_device *dev)
2293
{
T
Tejun Heo 已提交
2294
	struct ata_port *ap = dev->link->ap;
2295 2296 2297 2298

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

T
Tejun Heo 已提交
2299
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2300 2301
}

2302 2303 2304
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2305
	struct ata_port *ap = dev->link->ap;
2306 2307 2308 2309 2310 2311
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
T
Tejun Heo 已提交
2312
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2313 2314 2315
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2316
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2317
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2318 2319 2320 2321 2322 2323 2324 2325 2326
		dev->flags |= ATA_DFLAG_NCQ;
	}

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

2327
/**
2328 2329 2330 2331 2332
 *	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.
2333 2334
 *
 *	LOCKING:
2335 2336 2337 2338
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2339
 */
2340
int ata_dev_configure(struct ata_device *dev)
2341
{
T
Tejun Heo 已提交
2342 2343
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2344
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2345
	const u16 *id = dev->id;
2346
	unsigned long xfer_mask;
2347
	char revbuf[7];		/* XYZ-99\0 */
2348 2349
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2350
	int rc;
2351

2352
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2353
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2354
			       __func__);
2355
		return 0;
2356 2357
	}

2358
	if (ata_msg_probe(ap))
2359
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2360

T
Tejun Heo 已提交
2361 2362
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2363
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2364

2365 2366 2367 2368 2369 2370 2371
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2372 2373 2374 2375 2376 2377 2378 2379 2380 2381
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_WARNING,
			"WARNING: ATAPI is %s, device ignored.\n",
			atapi_enabled ? "not supported with this driver"
				      : "disabled");
		ata_dev_disable(dev);
		return 0;
	}

2382 2383 2384 2385
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2386 2387 2388 2389
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2390

T
Tejun Heo 已提交
2391 2392 2393 2394 2395
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2396
	/* print device capabilities */
2397
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2398 2399 2400
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
2401
			       __func__,
2402 2403
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2404

2405
	/* initialize to-be-configured parameters */
2406
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2407 2408 2409 2410 2411 2412
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2413
	dev->multi_count = 0;
2414

L
Linus Torvalds 已提交
2415 2416 2417 2418
	/*
	 * common ATA, ATAPI feature tests
	 */

2419
	/* find max transfer mode; for printk only */
2420
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2421

2422 2423
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2424

2425 2426 2427 2428 2429 2430 2431
	/* 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
2432 2433
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2434
		if (ata_id_is_cfa(id)) {
S
Sergei Shtylyov 已提交
2435 2436
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
T
Tejun Heo 已提交
2437 2438 2439
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2440
			snprintf(revbuf, 7, "CFA");
2441
		} else {
2442
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2443 2444 2445 2446 2447 2448
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
		}
2449

2450
		dev->n_sectors = ata_id_n_sectors(id);
2451

2452 2453 2454 2455 2456 2457 2458 2459 2460
		/* 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;
		}
2461

2462
		if (ata_id_has_lba(id)) {
2463
			const char *lba_desc;
2464
			char ncq_desc[20];
2465

2466 2467
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2468
			if (ata_id_has_lba48(id)) {
2469
				dev->flags |= ATA_DFLAG_LBA48;
2470
				lba_desc = "LBA48";
2471 2472 2473 2474

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2475
			}
2476

2477 2478 2479
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2480
			/* print device info to dmesg */
2481 2482 2483 2484 2485 2486 2487
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
2488
					(unsigned long long)dev->n_sectors,
2489 2490
					dev->multi_count, lba_desc, ncq_desc);
			}
2491
		} else {
2492 2493 2494
			/* CHS */

			/* Default translation */
2495 2496 2497
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2498

2499
			if (ata_id_current_chs_valid(id)) {
2500
				/* Current CHS translation is valid. */
2501 2502 2503
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2504 2505 2506
			}

			/* print device info to dmesg */
2507
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2508
				ata_dev_printk(dev, KERN_INFO,
2509 2510 2511
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2512
				ata_dev_printk(dev, KERN_INFO,
2513 2514 2515 2516 2517
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2518 2519
		}

2520
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2521 2522 2523
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2524
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2525 2526
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2527
		const char *dma_dir_string = "";
2528
		u32 sntf;
2529

2530
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2531
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2532
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2533 2534
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2535
			rc = -EINVAL;
L
Linus Torvalds 已提交
2536 2537
			goto err_out_nosup;
		}
2538
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2539

2540 2541 2542 2543
		/* 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.
2544
		 */
2545
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2546
		    (!sata_pmp_attached(ap) ||
2547
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2548 2549
			unsigned int err_mask;

2550
			/* issue SET feature command to turn this on */
2551 2552
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2553
			if (err_mask)
2554
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2555 2556 2557
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2558
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2559 2560
				atapi_an_string = ", ATAPI AN";
			}
2561 2562
		}

2563
		if (ata_id_cdb_intr(dev->id)) {
2564
			dev->flags |= ATA_DFLAG_CDB_INTR;
2565 2566
			cdb_intr_string = ", CDB intr";
		}
2567

2568 2569 2570 2571 2572
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2573
		/* print device info to dmesg */
2574
		if (ata_msg_drv(ap) && print_info)
2575
			ata_dev_printk(dev, KERN_INFO,
2576
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2577
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2578
				       ata_mode_string(xfer_mask),
2579 2580
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2581 2582
	}

2583 2584 2585 2586 2587
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2588 2589 2590 2591 2592 2593 2594
	if (!(dev->horkage & ATA_HORKAGE_IPM)) {
		if (ata_id_has_hipm(dev->id))
			dev->flags |= ATA_DFLAG_HIPM;
		if (ata_id_has_dipm(dev->id))
			dev->flags |= ATA_DFLAG_DIPM;
	}

2595 2596
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2597
	if (ata_dev_knobble(dev)) {
2598
		if (ata_msg_drv(ap) && print_info)
2599 2600
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2601
		dev->udma_mask &= ATA_UDMA5;
2602 2603 2604
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2605
	if ((dev->class == ATA_DEV_ATAPI) &&
2606
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2607
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2608 2609
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2610

T
Tejun Heo 已提交
2611
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2612 2613
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2614

2615 2616 2617 2618 2619 2620 2621
	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
		dev->horkage |= ATA_HORKAGE_IPM;

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

2622
	if (ap->ops->dev_config)
2623
		ap->ops->dev_config(dev);
2624

2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
		/* Let the user know. We don't want to disallow opens for
		   rescue purposes, or in case the vendor is just a blithering
		   idiot. Do this after the dev_config call as some controllers
		   with buggy firmware may want to avoid reporting false device
		   bugs */

		if (print_info) {
			ata_dev_printk(dev, KERN_WARNING,
"Drive reports diagnostics failure. This may indicate a drive\n");
			ata_dev_printk(dev, KERN_WARNING,
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2640 2641 2642 2643 2644 2645 2646
	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
		ata_dev_printk(dev, KERN_WARNING, "WARNING: device requires "
			       "firmware update to be fully functional.\n");
		ata_dev_printk(dev, KERN_WARNING, "         contact the vendor "
			       "or visit http://ata.wiki.kernel.org.\n");
	}

2647
	return 0;
L
Linus Torvalds 已提交
2648 2649

err_out_nosup:
2650
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2651
		ata_dev_printk(dev, KERN_DEBUG,
2652
			       "%s: EXIT, err\n", __func__);
2653
	return rc;
L
Linus Torvalds 已提交
2654 2655
}

A
Alan Cox 已提交
2656
/**
2657
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2658 2659
 *	@ap: port
 *
2660
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2661 2662 2663 2664 2665 2666 2667 2668 2669
 *	detection.
 */

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

/**
2670
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2671 2672
 *	@ap: port
 *
2673
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
 *	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
2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705
/**
 *	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
2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717
/**
 *	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
2718 2719 2720 2721
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2722 2723 2724 2725
 *	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
2726
 *	LOCKING:
J
Jeff Garzik 已提交
2727
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2728 2729
 *
 *	RETURNS:
2730
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2731 2732
 */

2733
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2734
{
2735
	unsigned int classes[ATA_MAX_DEVICES];
2736
	int tries[ATA_MAX_DEVICES];
2737
	int rc;
2738
	struct ata_device *dev;
L
Linus Torvalds 已提交
2739

2740
	ata_port_probe(ap);
2741

T
Tejun Heo 已提交
2742
	ata_for_each_dev(dev, &ap->link, ALL)
2743
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2744 2745

 retry:
T
Tejun Heo 已提交
2746
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764
		/* 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);
	}

2765
	/* reset and determine device classes */
2766
	ap->ops->phy_reset(ap);
2767

T
Tejun Heo 已提交
2768
	ata_for_each_dev(dev, &ap->link, ALL) {
2769 2770 2771 2772 2773
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2774

2775
		dev->class = ATA_DEV_UNKNOWN;
2776
	}
L
Linus Torvalds 已提交
2777

2778
	ata_port_probe(ap);
2779

2780 2781 2782 2783
	/* 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
2784
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2785 2786
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2787

2788
		if (!ata_dev_enabled(dev))
2789 2790
			continue;

2791 2792
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2793 2794
		if (rc)
			goto fail;
2795 2796
	}

A
Alan Cox 已提交
2797 2798 2799 2800
	/* 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
2801 2802 2803 2804 2805 2806
	/* 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
2807 2808 2809
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2810 2811 2812
	/* 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
2813
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2814
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2815
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2816
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2817 2818
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2819 2820
	}

2821
	/* configure transfer mode */
2822
	rc = ata_set_mode(&ap->link, &dev);
2823
	if (rc)
2824
		goto fail;
L
Linus Torvalds 已提交
2825

T
Tejun Heo 已提交
2826 2827
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2828

2829 2830
	/* no device present, disable port */
	ata_port_disable(ap);
2831
	return -ENODEV;
2832 2833

 fail:
2834 2835
	tries[dev->devno]--;

2836 2837
	switch (rc) {
	case -EINVAL:
2838
		/* eeek, something went very wrong, give up */
2839 2840
		tries[dev->devno] = 0;
		break;
2841 2842 2843 2844

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2845
	case -EIO:
2846 2847 2848 2849
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2850
			sata_down_spd_limit(&ap->link, 0);
2851 2852
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2853 2854
	}

2855
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2856
		ata_dev_disable(dev);
2857

2858
	goto retry;
L
Linus Torvalds 已提交
2859 2860 2861
}

/**
J
Jeff Garzik 已提交
2862 2863
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2864
 *
J
Jeff Garzik 已提交
2865 2866 2867
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2868
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2869
 *	serialization.
L
Linus Torvalds 已提交
2870 2871 2872 2873
 */

void ata_port_probe(struct ata_port *ap)
{
2874
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2875 2876
}

2877 2878
/**
 *	sata_print_link_status - Print SATA link status
2879
 *	@link: SATA link to printk link status about
2880 2881 2882 2883 2884 2885
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2886
static void sata_print_link_status(struct ata_link *link)
2887
{
2888
	u32 sstatus, scontrol, tmp;
2889

2890
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2891
		return;
2892
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2893

T
Tejun Heo 已提交
2894
	if (ata_phys_link_online(link)) {
2895
		tmp = (sstatus >> 4) & 0xf;
2896
		ata_link_printk(link, KERN_INFO,
2897 2898
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2899
	} else {
2900
		ata_link_printk(link, KERN_INFO,
2901 2902
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2903 2904 2905
	}
}

2906 2907 2908 2909 2910 2911 2912
/**
 *	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
 */
2913

T
Tejun Heo 已提交
2914
struct ata_device *ata_dev_pair(struct ata_device *adev)
2915
{
T
Tejun Heo 已提交
2916 2917
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2918
	if (!ata_dev_enabled(pair))
2919 2920 2921 2922
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2923
/**
J
Jeff Garzik 已提交
2924 2925
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2926
 *
J
Jeff Garzik 已提交
2927 2928 2929 2930 2931
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is disabled, and should
 *	never attempt to probe or communicate with devices
 *	on this port.
 *
J
Jeff Garzik 已提交
2932
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2933
 *	serialization.
L
Linus Torvalds 已提交
2934 2935 2936 2937
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2938 2939
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2940
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2941 2942
}

2943
/**
2944
 *	sata_down_spd_limit - adjust SATA spd limit downward
2945
 *	@link: Link to adjust SATA spd limit for
2946
 *	@spd_limit: Additional limit
2947
 *
2948
 *	Adjust SATA spd limit of @link downward.  Note that this
2949
 *	function only adjusts the limit.  The change must be applied
2950
 *	using sata_set_spd().
2951
 *
2952 2953 2954 2955 2956
 *	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.
 *
2957 2958 2959 2960 2961 2962
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2963
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2964
{
2965
	u32 sstatus, spd, mask;
2966
	int rc, bit;
2967

2968
	if (!sata_scr_valid(link))
2969 2970 2971
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2972
	 * If not, use cached value in link->sata_spd.
2973
	 */
2974
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2975
	if (rc == 0 && ata_sstatus_online(sstatus))
2976 2977
		spd = (sstatus >> 4) & 0xf;
	else
2978
		spd = link->sata_spd;
2979

2980
	mask = link->sata_spd_limit;
2981 2982
	if (mask <= 1)
		return -EINVAL;
2983 2984

	/* unconditionally mask off the highest bit */
2985 2986
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2987

2988 2989 2990 2991 2992 2993 2994 2995 2996
	/* 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? */
2997 2998 2999
	if (!mask)
		return -EINVAL;

3000 3001 3002 3003 3004 3005 3006 3007 3008
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

3009
	link->sata_spd_limit = mask;
3010

3011
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
3012
			sata_spd_string(fls(mask)));
3013 3014 3015 3016

	return 0;
}

3017
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3018
{
3019 3020
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
3021

3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032
	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;
3033
	else
3034
		target = fls(limit);
3035 3036

	spd = (*scontrol >> 4) & 0xf;
3037
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3038

3039
	return spd != target;
3040 3041 3042
}

/**
3043
 *	sata_set_spd_needed - is SATA spd configuration needed
3044
 *	@link: Link in question
3045 3046
 *
 *	Test whether the spd limit in SControl matches
3047
 *	@link->sata_spd_limit.  This function is used to determine
3048 3049 3050 3051 3052 3053 3054 3055 3056
 *	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
3057
static int sata_set_spd_needed(struct ata_link *link)
3058 3059 3060
{
	u32 scontrol;

3061
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3062
		return 1;
3063

3064
	return __sata_set_spd_needed(link, &scontrol);
3065 3066 3067
}

/**
3068
 *	sata_set_spd - set SATA spd according to spd limit
3069
 *	@link: Link to set SATA spd for
3070
 *
3071
 *	Set SATA spd of @link according to sata_spd_limit.
3072 3073 3074 3075 3076 3077
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
3078
 *	changed.  Negative errno if SCR registers are inaccessible.
3079
 */
3080
int sata_set_spd(struct ata_link *link)
3081 3082
{
	u32 scontrol;
3083
	int rc;
3084

3085
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3086
		return rc;
3087

3088
	if (!__sata_set_spd_needed(link, &scontrol))
3089 3090
		return 0;

3091
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3092 3093
		return rc;

3094 3095 3096
	return 1;
}

A
Alan Cox 已提交
3097 3098 3099 3100 3101
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
3102
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
3103
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3104 3105 3106
 * 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
3107 3108 3109
 */

static const struct ata_timing ata_timing[] = {
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136
/*	{ 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
3137 3138 3139 3140

	{ 0xFF }
};

3141 3142
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
3143 3144 3145

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
3146 3147 3148 3149 3150 3151 3152 3153 3154
	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
3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165
}

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);
3166
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
3167 3168 3169 3170
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

3171
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
3172
{
3173 3174 3175 3176
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
3177

3178 3179 3180
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
3181 3182 3183 3184 3185 3186 3187 3188 3189
}

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

	/*
3190
	 * Find the mode.
3191
	 */
A
Alan Cox 已提交
3192 3193 3194 3195

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

3196 3197
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
3198 3199 3200 3201 3202 3203 3204
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
		memset(&p, 0, sizeof(p));
3205
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
3206 3207
			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
3208
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
3209 3210 3211 3212 3213 3214 3215 3216 3217
			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
		}
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

3218
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3219 3220

	/*
3221 3222 3223
	 * 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
3224 3225
	 */

3226
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3227 3228 3229 3230 3231
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3232
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
	 */

	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
3244

3245 3246 3247 3248 3249
	/* 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
3250 3251 3252 3253

	return 0;
}

3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304
/**
 *	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;
}

3305 3306 3307
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3308
 *	@sel: ATA_DNXFER_* selector
3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319
 *
 *	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
 */
3320
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3321
{
3322
	char buf[32];
3323 3324
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3325
	int quiet, highbit;
3326

3327 3328
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3329

3330 3331 3332 3333
	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);
3334

3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

	case ATA_DNXFER_DMA:
		if (udma_mask) {
			highbit = fls(udma_mask) - 1;
			udma_mask &= ~(1 << highbit);
			if (!udma_mask)
				return -ENOENT;
		} else if (mwdma_mask) {
			highbit = fls(mwdma_mask) - 1;
			mwdma_mask &= ~(1 << highbit);
			if (!mwdma_mask)
				return -ENOENT;
		}
		break;

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

	case ATA_DNXFER_FORCE_PIO0:
		pio_mask &= 1;
	case ATA_DNXFER_FORCE_PIO:
		mwdma_mask = 0;
		udma_mask = 0;
		break;

	default:
		BUG();
	}

	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);

	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
		return -ENOENT;

	if (!quiet) {
		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
			snprintf(buf, sizeof(buf), "%s:%s",
				 ata_mode_string(xfer_mask),
				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
		else
			snprintf(buf, sizeof(buf), "%s",
				 ata_mode_string(xfer_mask));

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
3387 3388 3389 3390 3391 3392 3393

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

	return 0;
}

T
Tejun Heo 已提交
3394
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3395
{
3396
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3397
	struct ata_eh_context *ehc = &dev->link->eh_context;
3398
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3399 3400
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3401
	unsigned int err_mask = 0;
3402
	int rc;
L
Linus Torvalds 已提交
3403

3404
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3405 3406 3407
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3408 3409 3410 3411 3412 3413 3414 3415 3416
	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
		dev_err_whine = " (SET_XFERMODE skipped)";
	else {
		if (nosetxfer)
			ata_dev_printk(dev, KERN_WARNING,
				       "NOSETXFER but PATA detected - can't "
				       "skip SETXFER, might malfunction\n");
		err_mask = ata_dev_set_xfermode(dev);
	}
3417

3418 3419 3420 3421 3422 3423 3424 3425 3426 3427
	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;

3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442
	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;
	}
3443 3444
	/* 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 */
3445
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3446 3447
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3448
		ign_dev_err = 1;
3449

3450 3451 3452
	/* 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
3453

3454 3455 3456 3457 3458 3459
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3460

3461 3462
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3463

3464 3465 3466 3467
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3468
	return 0;
3469 3470 3471 3472 3473

 fail:
	ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
		       "(err_mask=0x%x)\n", err_mask);
	return -EIO;
L
Linus Torvalds 已提交
3474 3475 3476
}

/**
3477
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3478
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3479
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3480
 *
3481 3482 3483
 *	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
3484
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3485
 *
L
Linus Torvalds 已提交
3486
 *	LOCKING:
J
Jeff Garzik 已提交
3487
 *	PCI/etc. bus probe sem.
3488 3489 3490
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3491
 */
3492

3493
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3494
{
3495
	struct ata_port *ap = link->ap;
3496
	struct ata_device *dev;
3497
	int rc = 0, used_dma = 0, found = 0;
3498

3499
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3500
	ata_for_each_dev(dev, link, ENABLED) {
3501
		unsigned long pio_mask, dma_mask;
3502
		unsigned int mode_mask;
3503

3504 3505 3506 3507 3508 3509
		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
3510
		ata_dev_xfermask(dev);
3511
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3512

3513 3514
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3515 3516 3517 3518 3519 3520

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

3521 3522
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3523

3524
		found = 1;
3525
		if (ata_dma_enabled(dev))
3526
			used_dma = 1;
3527
	}
3528
	if (!found)
3529
		goto out;
3530 3531

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3532
	ata_for_each_dev(dev, link, ENABLED) {
3533
		if (dev->pio_mode == 0xff) {
3534
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3535
			rc = -EINVAL;
3536
			goto out;
3537 3538 3539 3540 3541 3542 3543
		}

		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
3544

3545
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3546 3547
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3548 3549 3550 3551 3552 3553 3554
			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
3555 3556

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3557
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3558
		rc = ata_dev_set_mode(dev);
3559
		if (rc)
3560
			goto out;
3561
	}
L
Linus Torvalds 已提交
3562

3563 3564
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3565
	 */
J
Jeff Garzik 已提交
3566
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3567
		ap->host->simplex_claimed = ap;
3568

3569 3570 3571 3572
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
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
/**
 *	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;
3599
	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3600 3601
	int warned = 0;

T
Tejun Heo 已提交
3602 3603 3604 3605 3606 3607
	/* 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);

3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669
	if (time_after(nodev_deadline, deadline))
		nodev_deadline = deadline;

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

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

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

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

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

		msleep(50);
	}
}

/**
 *	ata_wait_after_reset - wait for link to become ready after reset
 *	@link: link to be waited on
 *	@deadline: deadline jiffies for the operation
 *	@check_ready: callback to check link readiness
 *
 *	Wait for @link to become ready after reset.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 if @linke is ready before @deadline; otherwise, -errno.
 */
3670
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3671 3672
				int (*check_ready)(struct ata_link *link))
{
3673
	msleep(ATA_WAIT_AFTER_RESET);
3674 3675 3676 3677

	return ata_wait_ready(link, deadline, check_ready);
}

3678
/**
3679 3680
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3681
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3682
 *	@deadline: deadline jiffies for the operation
3683
 *
3684
*	Make sure SStatus of @link reaches stable state, determined by
3685 3686
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3687 3688
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3689 3690
 *	until timeout then returns 0 if DET is stable at 1.
 *
3691 3692 3693
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3694 3695 3696 3697 3698 3699
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3700 3701
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3702
{
3703 3704
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3705
	unsigned long last_jiffies, t;
3706 3707 3708
	u32 last, cur;
	int rc;

3709
	t = ata_deadline(jiffies, params[2]);
3710 3711 3712
	if (time_before(t, deadline))
		deadline = t;

3713
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3714 3715 3716 3717 3718 3719 3720
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3721
		msleep(interval);
3722
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3723 3724 3725 3726 3727
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3728
			if (cur == 1 && time_before(jiffies, deadline))
3729
				continue;
3730 3731
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3732 3733 3734 3735 3736 3737 3738 3739
				return 0;
			continue;
		}

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

3740 3741 3742
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3743
		if (time_after(jiffies, deadline))
3744
			return -EPIPE;
3745 3746 3747 3748
	}
}

/**
3749 3750
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3751
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3752
 *	@deadline: deadline jiffies for the operation
3753
 *
3754
 *	Resume SATA phy @link and debounce it.
3755 3756 3757 3758 3759 3760 3761
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3762 3763
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3764
{
3765
	u32 scontrol, serror;
3766 3767
	int rc;

3768
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3769
		return rc;
3770

3771
	scontrol = (scontrol & 0x0f0) | 0x300;
3772

3773
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3774
		return rc;
3775

3776 3777 3778 3779
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3780

3781 3782 3783
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3784
	/* clear SError, some PHYs require this even for SRST to work */
3785 3786 3787
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3788
	return rc != -EINVAL ? rc : 0;
3789 3790
}

3791
/**
3792
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3793
 *	@link: ATA link to be reset
3794
 *	@deadline: deadline jiffies for the operation
3795
 *
T
Tejun Heo 已提交
3796
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3797 3798 3799 3800
 *	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.
3801 3802 3803 3804 3805 3806 3807
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3808
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3809
{
T
Tejun Heo 已提交
3810
	struct ata_port *ap = link->ap;
3811
	struct ata_eh_context *ehc = &link->eh_context;
3812
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3813 3814 3815 3816 3817 3818
	int rc;

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

3819
	/* if SATA, resume link */
3820
	if (ap->flags & ATA_FLAG_SATA) {
3821
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3822 3823
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3824
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3825 3826 3827
					"link for reset (errno=%d)\n", rc);
	}

3828
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3829
	if (ata_phys_link_offline(link))
3830 3831
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3832 3833 3834
	return 0;
}

3835
/**
T
Tejun Heo 已提交
3836 3837 3838
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3839
 *	@deadline: deadline jiffies for the operation
3840 3841
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3842
 *
T
Tejun Heo 已提交
3843
 *	SATA phy-reset @link using DET bits of SControl register.
3844 3845 3846 3847 3848 3849 3850 3851
 *	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.
3852 3853 3854 3855 3856 3857 3858
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3859
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3860 3861
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3862
{
T
Tejun Heo 已提交
3863
	u32 scontrol;
3864
	int rc;
3865

3866 3867
	DPRINTK("ENTER\n");

3868 3869 3870
	if (online)
		*online = false;

3871
	if (sata_set_spd_needed(link)) {
3872 3873 3874 3875 3876
		/* 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.
		 */
3877
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3878
			goto out;
3879

3880
		scontrol = (scontrol & 0x0f0) | 0x304;
3881

3882
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3883
			goto out;
3884

3885
		sata_set_spd(link);
3886 3887 3888
	}

	/* issue phy wake/reset */
3889
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3890
		goto out;
3891

3892
	scontrol = (scontrol & 0x0f0) | 0x301;
3893

3894
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3895
		goto out;
3896

3897
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3898 3899 3900 3901
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3902 3903
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3904 3905 3906
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3907
	if (ata_phys_link_offline(link))
3908 3909 3910 3911 3912 3913
		goto out;

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

T
Tejun Heo 已提交
3914
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3915 3916 3917 3918 3919 3920 3921 3922
		/* 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;

3923 3924
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935
			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);
3936
 out:
3937 3938 3939 3940
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3941 3942
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3943
	}
3944 3945 3946 3947
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973
/**
 *	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;
}

3974
/**
3975
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3976
 *	@link: the target ata_link
3977 3978 3979 3980 3981 3982 3983 3984 3985
 *	@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)
 */
3986
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3987
{
3988 3989
	u32 serror;

3990 3991
	DPRINTK("ENTER\n");

3992 3993 3994 3995
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3996
	/* print link status */
3997
	sata_print_link_status(link);
3998 3999 4000 4001

	DPRINTK("EXIT\n");
}

4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017
/**
 *	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
4018 4019
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
4020 4021
{
	const u16 *old_id = dev->id;
4022 4023
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4024 4025

	if (dev->class != new_class) {
4026 4027
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
4028 4029 4030
		return 0;
	}

4031 4032 4033 4034
	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]));
4035 4036

	if (strcmp(model[0], model[1])) {
4037 4038
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
4039 4040 4041 4042
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
4043 4044
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
4045 4046 4047 4048 4049 4050 4051
		return 0;
	}

	return 1;
}

/**
4052
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
4053
 *	@dev: target ATA device
4054
 *	@readid_flags: read ID flags
4055 4056 4057 4058 4059 4060 4061 4062 4063 4064
 *
 *	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
 */
4065
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4066
{
4067
	unsigned int class = dev->class;
T
Tejun Heo 已提交
4068
	u16 *id = (void *)dev->link->ap->sector_buf;
4069 4070
	int rc;

4071
	/* read ID data */
4072
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4073
	if (rc)
4074
		return rc;
4075 4076

	/* is the device still there? */
4077 4078
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
4079

4080
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4081 4082 4083 4084 4085 4086
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4087
 *	@new_class: new class code
4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098
 *	@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
 */
4099 4100
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4101
{
4102
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
4103
	u64 n_native_sectors = dev->n_native_sectors;
4104 4105 4106 4107 4108
	int rc;

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

4109 4110
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
4111 4112 4113
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
4114 4115 4116 4117 4118 4119
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

4120 4121 4122 4123
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4124 4125

	/* configure device according to the new ID */
4126
	rc = ata_dev_configure(dev);
4127 4128 4129 4130
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4131 4132
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
T
Tejun Heo 已提交
4133
		ata_dev_printk(dev, KERN_WARNING, "n_sectors mismatch "
4134 4135 4136
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
T
Tejun Heo 已提交
4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156
		/*
		 * Something could have caused HPA to be unlocked
		 * involuntarily.  If n_native_sectors hasn't changed
		 * and the new size matches it, keep the device.
		 */
		if (dev->n_native_sectors == n_native_sectors &&
		    dev->n_sectors > n_sectors &&
		    dev->n_sectors == n_native_sectors) {
			ata_dev_printk(dev, KERN_WARNING,
				       "new n_sectors matches native, probably "
				       "late HPA unlock, continuing\n");
			/* keep using the old n_sectors */
			dev->n_sectors = n_sectors;
		} else {
			/* restore original n_[native]_sectors and fail */
			dev->n_native_sectors = n_native_sectors;
			dev->n_sectors = n_sectors;
			rc = -ENODEV;
			goto fail;
		}
4157 4158 4159
	}

	return 0;
4160 4161

 fail:
4162
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4163 4164 4165
	return rc;
}

4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
4202
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4203
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4204
	/* Odd clown on sil3726/4726 PMPs */
4205
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4206

4207
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4208
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4209
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4210

4211 4212 4213 4214
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4215
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4216
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4217 4218
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4219
	/* NCQ is broken */
4220
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4221
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4222
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4223
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4224
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4225

4226
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4227
	{ "ST31500341AS",	"SD15",		ATA_HORKAGE_NONCQ |
4228
						ATA_HORKAGE_FIRMWARE_WARN },
4229
	{ "ST31500341AS",	"SD16",		ATA_HORKAGE_NONCQ |
4230
						ATA_HORKAGE_FIRMWARE_WARN },
4231
	{ "ST31500341AS",	"SD17",		ATA_HORKAGE_NONCQ |
4232
						ATA_HORKAGE_FIRMWARE_WARN },
4233
	{ "ST31500341AS",	"SD18",		ATA_HORKAGE_NONCQ |
4234
						ATA_HORKAGE_FIRMWARE_WARN },
4235
	{ "ST31500341AS",	"SD19",		ATA_HORKAGE_NONCQ |
4236
						ATA_HORKAGE_FIRMWARE_WARN },
4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290

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

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

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

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

	{ "ST3320613AS",	"SD15",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD16",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD17",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD18",		ATA_HORKAGE_NONCQ |
						ATA_HORKAGE_FIRMWARE_WARN },
	{ "ST3320613AS",	"SD19",		ATA_HORKAGE_NONCQ |
4291 4292
						ATA_HORKAGE_FIRMWARE_WARN },

4293 4294 4295 4296 4297
	/* 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, },
4298

4299 4300 4301 4302 4303
	/* 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 },
4304

T
Tejun Heo 已提交
4305 4306 4307
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4308 4309 4310
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4311
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4312

A
Alan Cox 已提交
4313 4314
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4315 4316 4317
	/* Maybe we should just blacklist TSSTcorp... */
	{ "TSSTcorp CDDVDW SH-S202H", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202H", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4318
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4319 4320 4321
	{ "TSSTcorp CDDVDW SH-S202J", "SB01",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4322

4323 4324 4325
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4326 4327 4328
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },

4329 4330 4331 4332 4333 4334
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
	{ "PIONEER DVD-RW  DVRTD08",	"1.00",	ATA_HORKAGE_NOSETXFER },

4335 4336
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4337
};
4338

4339
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4340 4341 4342 4343 4344 4345 4346 4347 4348 4349
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4350
	else {
4351
		len = strlen(name);
4352 4353 4354 4355 4356 4357
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4358 4359 4360 4361

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4362
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4363
{
T
Tejun Heo 已提交
4364 4365
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4366
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4367

T
Tejun Heo 已提交
4368 4369
	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
4370

4371
	while (ad->model_num) {
4372
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4373 4374
			if (ad->model_rev == NULL)
				return ad->horkage;
4375
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4376
				return ad->horkage;
4377
		}
4378
		ad++;
4379
	}
L
Linus Torvalds 已提交
4380 4381 4382
	return 0;
}

4383 4384 4385 4386 4387 4388
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
4389
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4390 4391
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4392
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4393 4394
}

A
Alan Cox 已提交
4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409
/**
 *	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);
}

4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427
/**
 *	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
4428
	/* If the controller thinks we are 40 wire, we are. */
4429 4430
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4431 4432

	/* If the controller thinks we are 80 wire, we are. */
4433 4434
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4435 4436 4437 4438 4439

	/* 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
4440 4441
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4442 4443 4444 4445 4446 4447 4448 4449 4450 4451

	/* 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
4452 4453 4454
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4455 4456 4457 4458 4459 4460
				return 0;
		}
	}
	return 1;
}

4461 4462 4463 4464
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4465 4466 4467 4468
 *	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...
4469 4470 4471 4472
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4473
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4474
{
T
Tejun Heo 已提交
4475 4476
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4477
	struct ata_host *host = ap->host;
4478
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4479

4480
	/* controller modes available */
4481 4482 4483
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4484
	/* drive modes available */
4485 4486 4487
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4488

4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499
	/*
	 *	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));
	}

4500 4501
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4502 4503
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4504
	}
4505

4506
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4507
	    host->simplex_claimed && host->simplex_claimed != ap) {
4508 4509 4510
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4511
	}
4512

J
Jeff Garzik 已提交
4513 4514 4515
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4516
	if (ap->ops->mode_filter)
4517
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4518

4519 4520 4521 4522 4523 4524 4525 4526 4527 4528
	/* 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 */
4529
		if (cable_is_40wire(ap)) {
4530
			ata_dev_printk(dev, KERN_WARNING,
4531 4532 4533 4534
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4535 4536
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4537 4538 4539 4540 4541 4542
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4543 4544 4545
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4546
 *	LOCKING:
J
Jeff Garzik 已提交
4547
 *	PCI/etc. bus probe sem.
4548 4549 4550
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4551 4552
 */

T
Tejun Heo 已提交
4553
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4554
{
4555
	struct ata_taskfile tf;
4556
	unsigned int err_mask;
L
Linus Torvalds 已提交
4557 4558 4559 4560

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

T
Tejun Heo 已提交
4561 4562 4563
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4564
	ata_tf_init(dev, &tf);
4565 4566
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4567
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4568
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4569
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4570 4571
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4572 4573
	/* 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
4574
		tf.nsect = 0x01;
A
Alan Cox 已提交
4575 4576
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4577

4578
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4579 4580 4581 4582 4583

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4584
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4585 4586
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4587
 *	@feature: The sector count represents the feature to set
4588 4589
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4590
 *	on port @ap with sector count
4591 4592 4593 4594 4595 4596 4597
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4598 4599
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611
{
	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;
4612
	tf.nsect = feature;
4613

4614
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4615

4616 4617
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4618 4619
}

4620 4621 4622
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4623 4624
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4625 4626
 *
 *	LOCKING:
4627 4628 4629 4630
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4631
 */
T
Tejun Heo 已提交
4632 4633
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4634
{
4635
	struct ata_taskfile tf;
4636
	unsigned int err_mask;
4637 4638 4639

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4640
		return AC_ERR_INVALID;
4641 4642 4643 4644

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

T
Tejun Heo 已提交
4645
	ata_tf_init(dev, &tf);
4646 4647 4648 4649 4650
	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 */
4651

4652
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4653 4654 4655 4656 4657
	/* 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;
4658

4659 4660
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4661 4662
}

L
Linus Torvalds 已提交
4663
/**
J
Jeff Garzik 已提交
4664 4665 4666 4667
 *	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
4668 4669
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4670
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4671
 */
4672
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4673 4674
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4675
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4676 4677
	int dir = qc->dma_dir;

4678
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4679

4680
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4681

4682
	if (qc->n_elem)
4683
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4684 4685

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4686
	qc->sg = NULL;
L
Linus Torvalds 已提交
4687 4688 4689
}

/**
4690
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4691 4692
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4693 4694 4695 4696
 *	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
4697
 *	LOCKING:
T
Tejun Heo 已提交
4698 4699 4700 4701 4702
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4703
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4704 4705
{
	struct ata_port *ap = qc->ap;
4706

T
Tejun Heo 已提交
4707 4708 4709
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4710 4711
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4712
		return 1;
4713

T
Tejun Heo 已提交
4714 4715
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4716

T
Tejun Heo 已提交
4717 4718
	return 0;
}
L
Linus Torvalds 已提交
4719

T
Tejun Heo 已提交
4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737
/**
 *	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;
4738

T
Tejun Heo 已提交
4739 4740 4741 4742 4743 4744 4745
	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;
	}
4746

T
Tejun Heo 已提交
4747 4748
	return ATA_DEFER_LINK;
}
4749

T
Tejun Heo 已提交
4750
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4751

T
Tejun Heo 已提交
4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771
/**
 *	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;
}
4772

T
Tejun Heo 已提交
4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789
/**
 *	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
4790

T
Tejun Heo 已提交
4791
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4792

T
Tejun Heo 已提交
4793 4794 4795
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4796

T
Tejun Heo 已提交
4797
	DPRINTK("%d sg elements mapped\n", n_elem);
4798
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4799 4800
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4801

T
Tejun Heo 已提交
4802
	return 0;
L
Linus Torvalds 已提交
4803 4804
}

T
Tejun Heo 已提交
4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817
/**
 *	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)
4818
{
T
Tejun Heo 已提交
4819 4820
#ifdef __BIG_ENDIAN
	unsigned int i;
4821

T
Tejun Heo 已提交
4822 4823 4824
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4825 4826
}

4827 4828
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4829
 *	@ap: target port
4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856
 *
 *	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
4857 4858 4859 4860 4861
/**
 *	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
4862
 *	None.
L
Linus Torvalds 已提交
4863 4864
 */

4865
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4866
{
T
Tejun Heo 已提交
4867
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4868 4869
	struct ata_queued_cmd *qc;

4870
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4871 4872 4873 4874 4875
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4876
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4877 4878 4879 4880 4881
	}

	return qc;
}

4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896
/**
 *	ata_qc_free - free unused ata_queued_cmd
 *	@qc: Command to complete
 *
 *	Designed to free unused ata_queued_cmd object
 *	in case something prevents using it.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4897
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4898 4899 4900 4901 4902 4903 4904 4905 4906

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

4907
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4908
{
4909
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4910
	struct ata_link *link = qc->dev->link;
4911

4912 4913
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4914 4915 4916 4917

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

4918
	/* command should be marked inactive atomically with qc completion */
4919
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4920
		link->sactive &= ~(1 << qc->tag);
4921 4922 4923
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4924
		link->active_tag = ATA_TAG_POISON;
4925 4926 4927 4928 4929 4930 4931
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4932

4933 4934 4935 4936 4937
	/* 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;
4938
	ap->qc_active &= ~(1 << qc->tag);
4939

L
Linus Torvalds 已提交
4940
	/* call completion callback */
4941
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4942 4943
}

4944 4945 4946 4947 4948
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4949
	ap->ops->qc_fill_rtf(qc);
4950 4951
}

4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

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

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

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

	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}

4968 4969 4970 4971 4972 4973 4974 4975
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
 *	Indicate to the mid and upper layers that an ATA
 *	command has completed, with either an ok or not-ok status.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4976
 *	spin_lock_irqsave(host lock)
4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995
 */
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) {
4996 4997 4998
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4999
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
5000 5001 5002 5003 5004 5005 5006

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

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			if (!ata_tag_internal(qc->tag)) {
				/* always fill result TF for failed qc */
5007
				fill_result_tf(qc);
5008 5009 5010 5011 5012 5013 5014
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5015
			fill_result_tf(qc);
5016

5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031
		/* 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;
5032 5033 5034 5035

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
5036 5037
		}

5038 5039 5040
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

5041 5042 5043 5044 5045 5046 5047
		__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)
5048
			fill_result_tf(qc);
5049 5050 5051 5052 5053

		__ata_qc_complete(qc);
	}
}

5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *
 *	Complete in-flight commands.  This functions is meant to be
 *	called from low-level driver's interrupt routine to complete
 *	requests normally.  ap->qc_active and @qc_active is compared
 *	and commands are completed accordingly.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5065
 *	spin_lock_irqsave(host lock)
5066 5067 5068 5069
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
5070
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082
{
	int nr_done = 0;
	u32 done_mask;

	done_mask = ap->qc_active ^ qc_active;

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

5083
	while (done_mask) {
5084
		struct ata_queued_cmd *qc;
5085
		unsigned int tag = __ffs(done_mask);
5086

5087 5088
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
5089 5090 5091
			ata_qc_complete(qc);
			nr_done++;
		}
5092
		done_mask &= ~(1 << tag);
5093 5094 5095 5096 5097
	}

	return nr_done;
}

L
Linus Torvalds 已提交
5098 5099 5100 5101 5102 5103 5104 5105 5106 5107
/**
 *	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
5108
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5109
 */
5110
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5111 5112
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5113
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
5114
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5115

5116 5117 5118 5119
	/* 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.
	 */
5120
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5121

5122
	if (ata_is_ncq(prot)) {
5123
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5124 5125 5126

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5127
		link->sactive |= 1 << qc->tag;
5128
	} else {
5129
		WARN_ON_ONCE(link->sactive);
5130 5131

		ap->nr_active_links++;
T
Tejun Heo 已提交
5132
		link->active_tag = qc->tag;
5133 5134
	}

5135
	qc->flags |= ATA_QCFLAG_ACTIVE;
5136
	ap->qc_active |= 1 << qc->tag;
5137

5138 5139 5140
	/* We guarantee to LLDs that they will have at least one
	 * non-zero sg if the command is a data command.
	 */
T
Tejun Heo 已提交
5141
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5142

T
Tejun Heo 已提交
5143
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5144
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5145 5146
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
5147

T
Tejun Heo 已提交
5148
	/* if device is sleeping, schedule reset and abort the link */
5149
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5150
		link->eh_info.action |= ATA_EH_RESET;
5151 5152 5153 5154 5155
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5156 5157
	ap->ops->qc_prep(qc);

5158 5159 5160 5161
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5162

5163
sg_err:
5164 5165 5166
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5167 5168
}

5169 5170
/**
 *	sata_scr_valid - test whether SCRs are accessible
5171
 *	@link: ATA link to test SCR accessibility for
5172
 *
5173
 *	Test whether SCRs are accessible for @link.
5174 5175 5176 5177 5178 5179 5180
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5181
int sata_scr_valid(struct ata_link *link)
5182
{
5183 5184
	struct ata_port *ap = link->ap;

5185
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5186 5187 5188 5189
}

/**
 *	sata_scr_read - read SCR register of the specified port
5190
 *	@link: ATA link to read SCR for
5191 5192 5193
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5194
 *	Read SCR register @reg of @link into *@val.  This function is
5195 5196
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5197 5198
 *
 *	LOCKING:
5199
 *	None if @link is ap->link.  Kernel thread context otherwise.
5200 5201 5202 5203
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5204
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5205
{
5206 5207
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5208
			return link->ap->ops->scr_read(link, reg, val);
5209 5210 5211 5212
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5213 5214 5215 5216
}

/**
 *	sata_scr_write - write SCR register of the specified port
5217
 *	@link: ATA link to write SCR for
5218 5219 5220
 *	@reg: SCR to write
 *	@val: value to write
 *
5221
 *	Write @val to SCR register @reg of @link.  This function is
5222 5223
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5224 5225
 *
 *	LOCKING:
5226
 *	None if @link is ap->link.  Kernel thread context otherwise.
5227 5228 5229 5230
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5231
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5232
{
5233 5234
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5235
			return link->ap->ops->scr_write(link, reg, val);
5236 5237
		return -EOPNOTSUPP;
	}
5238

5239
	return sata_pmp_scr_write(link, reg, val);
5240 5241 5242 5243
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5244
 *	@link: ATA link to write SCR for
5245 5246 5247 5248 5249 5250 5251
 *	@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:
5252
 *	None if @link is ap->link.  Kernel thread context otherwise.
5253 5254 5255 5256
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5257
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5258
{
5259 5260
	if (ata_is_host_link(link)) {
		int rc;
5261

5262
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5263
			rc = link->ap->ops->scr_write(link, reg, val);
5264
			if (rc == 0)
T
Tejun Heo 已提交
5265
				rc = link->ap->ops->scr_read(link, reg, &val);
5266 5267 5268
			return rc;
		}
		return -EOPNOTSUPP;
5269
	}
5270 5271

	return sata_pmp_scr_write(link, reg, val);
5272 5273 5274
}

/**
T
Tejun Heo 已提交
5275
 *	ata_phys_link_online - test whether the given link is online
5276
 *	@link: ATA link to test
5277
 *
5278 5279 5280
 *	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).
5281 5282 5283 5284 5285
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5286
 *	True if the port online status is available and online.
5287
 */
T
Tejun Heo 已提交
5288
bool ata_phys_link_online(struct ata_link *link)
5289 5290 5291
{
	u32 sstatus;

5292
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5293
	    ata_sstatus_online(sstatus))
5294 5295
		return true;
	return false;
5296 5297 5298
}

/**
T
Tejun Heo 已提交
5299
 *	ata_phys_link_offline - test whether the given link is offline
5300
 *	@link: ATA link to test
5301
 *
5302 5303 5304
 *	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).
5305 5306 5307 5308 5309
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5310
 *	True if the port offline status is available and offline.
5311
 */
T
Tejun Heo 已提交
5312
bool ata_phys_link_offline(struct ata_link *link)
5313 5314 5315
{
	u32 sstatus;

5316
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5317
	    !ata_sstatus_online(sstatus))
5318 5319
		return true;
	return false;
5320
}
E
Edward Falk 已提交
5321

T
Tejun Heo 已提交
5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373
/**
 *	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));
}

5374
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5375 5376 5377
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5378 5379 5380 5381
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5382 5383
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5384
		struct ata_link *link;
5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403

		/* Previous resume operation might still be in
		 * progress.  Wait for PM_PENDING to clear.
		 */
		if (ap->pflags & ATA_PFLAG_PM_PENDING) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
		}

		/* request PM ops to EH */
		spin_lock_irqsave(ap->lock, flags);

		ap->pm_mesg = mesg;
		if (wait) {
			rc = 0;
			ap->pm_result = &rc;
		}

		ap->pflags |= ATA_PFLAG_PM_PENDING;
T
Tejun Heo 已提交
5404
		ata_for_each_link(link, ap, HOST_FIRST) {
5405 5406 5407
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425

		ata_port_schedule_eh(ap);

		spin_unlock_irqrestore(ap->lock, flags);

		/* wait and check result */
		if (wait) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
			if (rc)
				return rc;
		}
	}

	return 0;
}

/**
J
Jeff Garzik 已提交
5426 5427
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5428 5429
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5430
 *	Suspend @host.  Actual operation is performed by EH.  This
5431 5432 5433 5434 5435 5436 5437 5438 5439
 *	function requests EH to perform PM operations and waits for EH
 *	to finish.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
J
Jeff Garzik 已提交
5440
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5441
{
5442
	int rc;
5443

5444 5445 5446 5447 5448 5449
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5450
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5451 5452
	if (rc == 0)
		host->dev->power.power_state = mesg;
5453 5454 5455 5456
	return rc;
}

/**
J
Jeff Garzik 已提交
5457 5458
 *	ata_host_resume - resume host
 *	@host: host to resume
5459
 *
J
Jeff Garzik 已提交
5460
 *	Resume @host.  Actual operation is performed by EH.  This
5461 5462 5463 5464 5465 5466
 *	function requests EH to perform PM operations and returns.
 *	Note that all resume operations are performed parallely.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
J
Jeff Garzik 已提交
5467
void ata_host_resume(struct ata_host *host)
5468
{
T
Tejun Heo 已提交
5469
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5470
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5471
	host->dev->power.power_state = PMSG_ON;
5472 5473 5474

	/* reenable link pm */
	ata_lpm_disable(host);
5475
}
5476
#endif
5477

5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489
/**
 *	ata_port_start - Set port up for dma.
 *	@ap: Port to initialize
 *
 *	Called just after data structures for each port are
 *	initialized.  Allocates space for PRD table.
 *
 *	May be used as the port_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5490
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5491
{
5492
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5493

5494 5495
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5496 5497 5498 5499 5500 5501
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512
/**
 *	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
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5513
	struct ata_link *link = ata_dev_phys_link(dev);
T
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5514
	struct ata_port *ap = link->ap;
5515 5516
	unsigned long flags;

T
Tejun Heo 已提交
5517
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5518 5519
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5520

5521 5522
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5523
	 * host lock.
5524
	 */
5525
	spin_lock_irqsave(ap->lock, flags);
5526
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5527
	dev->horkage = 0;
5528
	spin_unlock_irqrestore(ap->lock, flags);
5529

5530 5531
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5532 5533 5534 5535 5536
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5537 5538 5539 5540
/**
 *	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
5541
 *	@pmp: Port multiplier port number
5542 5543 5544 5545 5546 5547
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5548
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5549 5550 5551 5552 5553 5554 5555
{
	int i;

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

	link->ap = ap;
T
Tejun Heo 已提交
5556
	link->pmp = pmp;
5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

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

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

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
5583
int sata_link_init_spd(struct ata_link *link)
5584
{
5585
	u8 spd;
5586 5587
	int rc;

T
Tejun Heo 已提交
5588
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5589 5590 5591
	if (rc)
		return rc;

T
Tejun Heo 已提交
5592
	spd = (link->saved_scontrol >> 4) & 0xf;
5593 5594 5595
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5596
	ata_force_link_limits(link);
5597

5598 5599 5600 5601 5602
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5603
/**
5604 5605
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5606
 *
5607 5608 5609 5610
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5611
 *
L
Linus Torvalds 已提交
5612
 *	LOCKING:
5613
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5614
 */
5615
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5616
{
5617
	struct ata_port *ap;
L
Linus Torvalds 已提交
5618

5619 5620 5621 5622 5623 5624
	DPRINTK("ENTER\n");

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

5625
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5626
	ap->lock = &host->lock;
5627
	ap->flags = ATA_FLAG_DISABLED;
5628
	ap->print_id = -1;
L
Linus Torvalds 已提交
5629
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5630
	ap->host = host;
5631
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5632
	ap->last_ctl = 0xFF;
5633 5634 5635 5636 5637 5638

#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
5639
#else
5640
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5641
#endif
L
Linus Torvalds 已提交
5642

T
Tejun Heo 已提交
5643
#ifdef CONFIG_ATA_SFF
5644
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5645 5646
#else
	INIT_DELAYED_WORK(&ap->port_task, NULL);
T
Tejun Heo 已提交
5647
#endif
5648 5649
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5650
	INIT_LIST_HEAD(&ap->eh_done_q);
5651
	init_waitqueue_head(&ap->eh_wait_q);
5652
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5653 5654 5655
	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
5656

5657 5658
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5659
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5660 5661 5662 5663 5664 5665 5666 5667

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

5668 5669 5670 5671 5672
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5673 5674 5675
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5676 5677 5678 5679
		if (!ap)
			continue;

		if (ap->scsi_host)
5680 5681
			scsi_host_put(ap->scsi_host);

5682
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5683
		kfree(ap->slave_link);
5684
		kfree(ap);
5685 5686 5687
		host->ports[i] = NULL;
	}

5688
	dev_set_drvdata(gendev, NULL);
5689 5690
}

5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

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

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

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

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

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

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

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

	devres_remove_group(dev, NULL);
	return host;

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

5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793
/**
 *	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;
5794
		ap->link.flags |= pi->link_flags;
5795 5796 5797 5798 5799 5800 5801 5802 5803
		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
5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865
/**
 *	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;
}

5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883
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);
}

5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905
/**
 *	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)
{
5906
	static DEFINE_SPINLOCK(lock);
5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933
	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);
}

5934 5935 5936 5937 5938 5939 5940
/**
 *	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
5941 5942
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5943 5944 5945 5946 5947 5948 5949 5950 5951
 *
 *	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)
{
5952 5953
	int have_stop = 0;
	void *start_dr = NULL;
5954 5955 5956 5957 5958
	int i, rc;

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

5959 5960
	ata_finalize_port_ops(host->ops);

5961 5962 5963
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5964 5965
		ata_finalize_port_ops(ap->ops);

5966 5967 5968
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984
		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];

5985 5986 5987
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5988
				if (rc != -ENODEV)
A
Andrew Morton 已提交
5989 5990 5991
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
5992 5993 5994 5995 5996 5997
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5998 5999
	if (start_dr)
		devres_add(host->dev, start_dr);
6000 6001 6002 6003 6004 6005 6006 6007 6008 6009
	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);
	}
6010
	devres_free(start_dr);
6011 6012 6013
	return rc;
}

6014
/**
J
Jeff Garzik 已提交
6015 6016 6017 6018 6019
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6020 6021 6022 6023 6024
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6025
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6026
void ata_host_init(struct ata_host *host, struct device *dev,
6027
		   unsigned long flags, struct ata_port_operations *ops)
6028
{
J
Jeff Garzik 已提交
6029 6030 6031 6032
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6033 6034
}

6035 6036 6037 6038 6039

static void async_port_probe(void *data, async_cookie_t cookie)
{
	int rc;
	struct ata_port *ap = data;
6040 6041 6042 6043 6044

	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
6045 6046
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
6047
	 */
6048
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6049 6050
		async_synchronize_cookie(cookie);

6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086
	/* probe */
	if (ap->ops->error_handler) {
		struct ata_eh_info *ehi = &ap->link.eh_info;
		unsigned long flags;

		ata_port_probe(ap);

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

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

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

		spin_unlock_irqrestore(ap->lock, flags);

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

		if (rc) {
			/* FIXME: do something useful here?
			 * Current libata behavior will
			 * tear down everything when
			 * the module is removed
			 * or the h/w is unplugged.
			 */
		}
	}
6087 6088 6089 6090 6091 6092

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

	ata_scsi_scan_host(ap, 1);

6093
}
6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

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

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

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

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

6137 6138 6139
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6140 6141 6142 6143 6144 6145 6146 6147 6148 6149
	/* 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 */
6150
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6151 6152
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6153

6154
		/* print per-port info to dmesg */
6155 6156 6157
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6158
		if (!ata_port_is_dummy(ap)) {
6159 6160
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6161
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6162
					ata_mode_string(xfer_mask),
6163
					ap->link.eh_info.desc);
6164 6165
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6166 6167 6168
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

V
Vegard Nossum 已提交
6169
	/* perform each probe asynchronously */
6170 6171
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6172
		async_schedule(async_port_probe, ap);
6173 6174 6175 6176 6177
	}

	return 0;
}

6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190
/**
 *	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.
 *
6191 6192 6193 6194
 *	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.
 *
6195 6196 6197 6198 6199 6200 6201 6202 6203 6204
 *	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)
{
6205
	int i, rc;
6206 6207 6208 6209 6210

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

6211 6212 6213 6214 6215 6216
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6217 6218 6219 6220 6221
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6222 6223
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6224

6225 6226 6227 6228 6229 6230 6231 6232
	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;
}

6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243
/**
 *	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).
 */
6244
static void ata_port_detach(struct ata_port *ap)
6245 6246 6247 6248
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6249
		goto skip_eh;
6250 6251

	/* tell EH we're leaving & flush EH */
6252
	spin_lock_irqsave(ap->lock, flags);
6253
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6254
	ata_port_schedule_eh(ap);
6255
	spin_unlock_irqrestore(ap->lock, flags);
6256

T
Tejun Heo 已提交
6257
	/* wait till EH commits suicide */
6258 6259
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6260 6261
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6262

6263
	cancel_rearming_delayed_work(&ap->hotplug_task);
6264

6265
 skip_eh:
6266
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6267
	scsi_remove_host(ap->scsi_host);
6268 6269
}

T
Tejun Heo 已提交
6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284
/**
 *	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]);
6285 6286 6287

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6288 6289
}

6290 6291
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6292 6293 6294 6295
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6296 6297 6298
 *	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
6299 6300 6301 6302
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6303
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6304
{
6305
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6306
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6307

T
Tejun Heo 已提交
6308
	ata_host_detach(host);
L
Linus Torvalds 已提交
6309 6310 6311
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6312
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343
{
	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
6344

6345
#ifdef CONFIG_PM
6346
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6347 6348
{
	pci_save_state(pdev);
6349
	pci_disable_device(pdev);
6350

6351
	if (mesg.event & PM_EVENT_SLEEP)
6352
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6353 6354
}

6355
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6356
{
6357 6358
	int rc;

J
Jens Axboe 已提交
6359 6360
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6361

T
Tejun Heo 已提交
6362
	rc = pcim_enable_device(pdev);
6363 6364 6365 6366 6367 6368
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
6369
	pci_set_master(pdev);
6370
	return 0;
6371 6372
}

6373
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6374
{
J
Jeff Garzik 已提交
6375
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6376 6377
	int rc = 0;

J
Jeff Garzik 已提交
6378
	rc = ata_host_suspend(host, mesg);
6379 6380 6381
	if (rc)
		return rc;

6382
	ata_pci_device_do_suspend(pdev, mesg);
6383 6384 6385 6386 6387 6388

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6389
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6390
	int rc;
6391

6392 6393 6394 6395
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6396
}
6397 6398
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6399 6400
#endif /* CONFIG_PCI */

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
static int __init ata_parse_force_one(char **cur,
				      struct ata_force_ent *force_ent,
				      const char **reason)
{
	/* FIXME: Currently, there's no way to tag init const data and
	 * using __initdata causes build failure on some versions of
	 * gcc.  Once __initdataconst is implemented, add const to the
	 * following structure.
	 */
	static struct ata_force_param force_tbl[] __initdata = {
		{ "40c",	.cbl		= ATA_CBL_PATA40 },
		{ "80c",	.cbl		= ATA_CBL_PATA80 },
		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
		{ "sata",	.cbl		= ATA_CBL_SATA },
		{ "1.5Gbps",	.spd_limit	= 1 },
		{ "3.0Gbps",	.spd_limit	= 2 },
		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
		{ "pio0",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 0) },
		{ "pio1",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 1) },
		{ "pio2",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 2) },
		{ "pio3",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 3) },
		{ "pio4",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 4) },
		{ "pio5",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 5) },
		{ "pio6",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 6) },
		{ "mwdma0",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 0) },
		{ "mwdma1",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 1) },
		{ "mwdma2",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 2) },
		{ "mwdma3",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 3) },
		{ "mwdma4",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 4) },
		{ "udma0",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma/16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma1",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma/25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma2",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma/33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma3",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma/44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma4",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma/66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma5",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma/100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma6",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma/133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma7",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 7) },
6455 6456 6457
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
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 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577
	};
	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
6578 6579 6580

static int __init ata_init(void)
{
6581 6582
	ata_parse_force_param();

L
Linus Torvalds 已提交
6583 6584
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
6585
		goto free_force_tbl;
L
Linus Torvalds 已提交
6586

6587
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
6588 6589
	if (!ata_aux_wq)
		goto free_wq;
6590

L
Linus Torvalds 已提交
6591 6592
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6593 6594 6595 6596 6597 6598

free_wq:
	destroy_workqueue(ata_wq);
free_force_tbl:
	kfree(ata_force_tbl);
	return -ENOMEM;
L
Linus Torvalds 已提交
6599 6600 6601 6602
}

static void __exit ata_exit(void)
{
6603
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6604
	destroy_workqueue(ata_wq);
6605
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6606 6607
}

6608
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6609 6610
module_exit(ata_exit);

6611
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6612
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631

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

	spin_lock_irqsave(&ata_ratelimit_lock, flags);

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

	spin_unlock_irqrestore(&ata_ratelimit_lock, flags);

	return rc;
}

6632 6633 6634 6635 6636
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6637 6638
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
6656
		      unsigned long interval, unsigned long timeout)
6657
{
6658
	unsigned long deadline;
6659 6660 6661 6662 6663 6664 6665 6666
	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.
	 */
6667
	deadline = ata_deadline(jiffies, timeout);
6668

6669 6670
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
		msleep(interval);
6671 6672 6673 6674 6675 6676
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6677 6678 6679
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6680
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6681
{
T
Tejun Heo 已提交
6682
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6683 6684
}

T
Tejun Heo 已提交
6685
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6686
{
T
Tejun Heo 已提交
6687
	/* truly dummy */
T
Tejun Heo 已提交
6688 6689
}

6690
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6691 6692
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6693
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6694 6695
};

6696 6697 6698 6699
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6700 6701 6702 6703 6704 6705
/*
 * 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.
 */
6706 6707 6708
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6709 6710
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6711
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6712
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6713 6714
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6715
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6716
EXPORT_SYMBOL_GPL(ata_host_init);
6717
EXPORT_SYMBOL_GPL(ata_host_alloc);
6718
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6719
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6720
EXPORT_SYMBOL_GPL(ata_host_start);
6721
EXPORT_SYMBOL_GPL(ata_host_register);
6722
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6723
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6724
EXPORT_SYMBOL_GPL(ata_sg_init);
6725
EXPORT_SYMBOL_GPL(ata_qc_complete);
6726
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6727
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6728 6729
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6730 6731 6732 6733 6734 6735 6736
EXPORT_SYMBOL_GPL(ata_pack_xfermask);
EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
EXPORT_SYMBOL_GPL(ata_mode_string);
EXPORT_SYMBOL_GPL(ata_id_xfermask);
L
Linus Torvalds 已提交
6737
EXPORT_SYMBOL_GPL(ata_port_start);
6738
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6739
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6740
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6741
EXPORT_SYMBOL_GPL(ata_port_probe);
6742
EXPORT_SYMBOL_GPL(ata_dev_disable);
6743
EXPORT_SYMBOL_GPL(sata_set_spd);
6744
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6745 6746
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6747
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6748
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6749
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6750
EXPORT_SYMBOL_GPL(ata_std_postreset);
6751 6752
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6753
EXPORT_SYMBOL_GPL(ata_port_disable);
6754
EXPORT_SYMBOL_GPL(ata_ratelimit);
6755
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6756 6757
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6758
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6759
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6760 6761 6762 6763
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);
6764 6765
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6766
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6767 6768
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6769
#endif /* CONFIG_PM */
6770 6771
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6772
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6773 6774
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6775
EXPORT_SYMBOL_GPL(ata_pio_queue_task);
6776
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6777
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6778 6779
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6780
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6781

L
Linus Torvalds 已提交
6782 6783 6784
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6785
#ifdef CONFIG_PM
6786 6787
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6788 6789
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6790
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6791
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6792

T
Tejun Heo 已提交
6793 6794 6795
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6796 6797 6798 6799
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6800
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6801
EXPORT_SYMBOL_GPL(ata_link_abort);
6802
EXPORT_SYMBOL_GPL(ata_port_abort);
6803
EXPORT_SYMBOL_GPL(ata_port_freeze);
6804
EXPORT_SYMBOL_GPL(sata_async_notification);
6805 6806
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6807 6808
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6809
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6810
EXPORT_SYMBOL_GPL(ata_do_eh);
6811
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6812 6813 6814 6815

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6816
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6817
EXPORT_SYMBOL_GPL(ata_cable_sata);