libata-core.c 176.2 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.h>
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/byteorder.h>
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#include <linux/cdrom.h>
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#include "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
633
};
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/**
636
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
637 638
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
640
 *	Examine the device configuration and tf->flags to calculate
641
 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
646
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;
651

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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
662
		index = dev->multi_count ? 0 : 8;
663 664
	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
666
	}
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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;
699
			block |= (u64)tf->hob_lbal << 24;
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		} else
			block |= (tf->device & 0xf) << 24;

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

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

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

		block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
720 721 722 723 724
	}

	return block;
}

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

752
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
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		/* yay, NCQ */
		if (!lba_48_ok(block, n_block))
			return -ERANGE;

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
863 864 865
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
866 867 868 869 870 871
{
	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);
}

872 873 874 875 876 877 878 879 880 881
/**
 *	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.
 */
882 883
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
884 885 886 887 888 889 890 891 892
{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

893
static const struct ata_xfer_ent {
894
	int shift, bits;
895 896
	u8 base;
} ata_xfer_tbl[] = {
897 898 899
	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
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	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
914
 *	Matching XFER_* value, 0xff if no match found.
915
 */
916
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
917 918 919 920 921 922 923
{
	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;
924
	return 0xff;
925 926 927 928 929 930 931 932 933 934 935 936 937 938
}

/**
 *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_mask for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mask, 0 if no match found.
 */
939
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
940 941 942 943 944
{
	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)
945 946
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	return 0;
}

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
962
int ata_xfer_mode2shift(unsigned long xfer_mode)
963 964 965 966 967 968 969 970 971
{
	const struct ata_xfer_ent *ent;

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

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/**
973 974
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
977
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
984
 *	@mode_mask, or the constant C string "<n/a>".
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 */
986
const char *ata_mode_string(unsigned long xfer_mask)
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{
988 989 990 991 992 993
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
994 995
		"PIO5",
		"PIO6",
996 997 998
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
999 1000
		"MWDMA3",
		"MWDMA4",
1001 1002 1003 1004 1005 1006 1007 1008 1009
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
1010
	int highbit;
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1012 1013 1014
	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>";
}

1018 1019 1020 1021 1022
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1023
		"6.0 Gbps",
1024 1025 1026 1027 1028 1029 1030
	};

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

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 1080 1081 1082 1083 1084 1085 1086
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;

1087 1088 1089 1090 1091
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
1092 1093 1094 1095 1096 1097 1098 1099 1100
		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;

1101 1102 1103 1104 1105
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
		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
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
 *
 *	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
1149 1150
/**
 *	ata_dev_disable_pm - disable SATA interface power management
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 *	@dev: device to disable power management
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
 *
 *	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 */
1170 1171 1172 1173

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1174
	ap->link.eh_info.action |= ATA_EH_LPM;
1175 1176 1177 1178
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

S
Stephen Rothwell 已提交
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#ifdef CONFIG_PM
1180 1181 1182 1183 1184 1185 1186 1187 1188
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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Tejun Heo 已提交
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		ata_for_each_link(link, ap, EDGE) {
			ata_for_each_dev(dev, link, ALL)
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
				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 */
1206

L
Linus Torvalds 已提交
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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:
1219 1220
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
L
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 */
J
Jeff Garzik 已提交
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
Linus Torvalds 已提交
1223 1224 1225 1226
{
	/* 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.
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
	 *
	 * 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
1244
	 */
1245
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
Linus Torvalds 已提交
1246 1247 1248 1249
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1250
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
L
Linus Torvalds 已提交
1251 1252 1253 1254
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1255 1256 1257 1258 1259 1260
	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;
1263 1264
	}

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1265 1266 1267 1268 1269
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
1270
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
Linus Torvalds 已提交
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
 *	@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.
 */

1284 1285
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
Linus Torvalds 已提交
1286 1287 1288
{
	unsigned int c;

1289 1290
	BUG_ON(len & 1);

L
Linus Torvalds 已提交
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

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

		ofs++;
		len -= 2;
	}
}

1305
/**
1306
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1307 1308 1309 1310 1311
 *	@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.
 *
1312
 *	This function is identical to ata_id_string except that it
1313 1314 1315 1316 1317 1318
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1319 1320
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1321 1322 1323
{
	unsigned char *p;

1324
	ata_id_string(id, s, ofs, len - 1);
1325 1326 1327 1328 1329 1330

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
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T
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1332 1333 1334 1335
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1336
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
T
Tejun Heo 已提交
1337
		else
1338
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
T
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1339 1340
	} else {
		if (ata_id_current_chs_valid(id))
1341 1342
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
T
Tejun Heo 已提交
1343
		else
1344 1345
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
T
Tejun Heo 已提交
1346 1347 1348
	}
}

1349
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1350 1351 1352 1353 1354
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1355
	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);

1360
	return sectors;
A
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1361 1362
}

1363
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
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1364 1365 1366 1367 1368 1369 1370 1371
{
	u64 sectors = 0;

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

1372
	return sectors;
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1373 1374 1375
}

/**
1376 1377 1378
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
Alan Cox 已提交
1379
 *
1380 1381
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
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 *
1383 1384 1385
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
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1386
 */
1387
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1388
{
1389
	unsigned int err_mask;
A
Alan Cox 已提交
1390
	struct ata_taskfile tf;
1391
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1392 1393 1394

	ata_tf_init(dev, &tf);

1395
	/* always clear all address registers */
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1396 1397
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1398 1399 1400 1401 1402
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
Alan Cox 已提交
1403 1404

	tf.protocol |= ATA_PROT_NODATA;
1405 1406
	tf.device |= ATA_LBA;

1407
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1408 1409 1410 1411 1412 1413 1414
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
A
Alan Cox 已提交
1415

1416
	if (lba48)
1417
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1418
	else
1419
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1420
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1421
		(*max_sectors)--;
1422
	return 0;
A
Alan Cox 已提交
1423 1424 1425
}

/**
1426 1427
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1428
 *	@new_sectors: new max sectors value to set for the device
A
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1429
 *
1430 1431 1432 1433 1434 1435
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
Alan Cox 已提交
1436
 */
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Tejun Heo 已提交
1437
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1438
{
1439
	unsigned int err_mask;
A
Alan Cox 已提交
1440
	struct ata_taskfile tf;
1441
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1442 1443 1444 1445 1446 1447

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1448 1449 1450 1451 1452 1453 1454 1455

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

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
T
Tejun Heo 已提交
1456
	} else {
1457 1458
		tf.command = ATA_CMD_SET_MAX;

T
Tejun Heo 已提交
1459 1460 1461
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1462
	tf.protocol |= ATA_PROT_NODATA;
1463
	tf.device |= ATA_LBA;
A
Alan Cox 已提交
1464 1465 1466 1467 1468

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

1469
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479
	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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1480 1481 1482 1483 1484 1485 1486 1487 1488
}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
T
Tejun Heo 已提交
1489 1490 1491
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
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1492
 */
T
Tejun Heo 已提交
1493
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1494
{
T
Tejun Heo 已提交
1495 1496
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
T
Tejun Heo 已提交
1497
	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
T
Tejun Heo 已提交
1498 1499
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1500
	int rc;
J
Jeff Garzik 已提交
1501

T
Tejun Heo 已提交
1502 1503 1504 1505
	/* 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))
1506
		return 0;
A
Alan Cox 已提交
1507

T
Tejun Heo 已提交
1508 1509 1510
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
Tejun Heo 已提交
1511 1512
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1513
		 */
T
Tejun Heo 已提交
1514
		if (rc == -EACCES || !unlock_hpa) {
T
Tejun Heo 已提交
1515
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1516
				       "broken, skipping HPA handling\n");
T
Tejun Heo 已提交
1517 1518 1519 1520 1521
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
Alan Cox 已提交
1522
		}
T
Tejun Heo 已提交
1523

T
Tejun Heo 已提交
1524 1525
		return rc;
	}
T
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1526
	dev->n_native_sectors = native_sectors;
T
Tejun Heo 已提交
1527 1528

	/* nothing to do? */
T
Tejun Heo 已提交
1529
	if (native_sectors <= sectors || !unlock_hpa) {
T
Tejun Heo 已提交
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 1570 1571 1572 1573 1574 1575 1576 1577
		if (!print_info || native_sectors == sectors)
			return 0;

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

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

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

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

	return 0;
A
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1578 1579
}

L
Linus Torvalds 已提交
1580 1581
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1582
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1583
 *
1584 1585
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1586 1587 1588 1589 1590
 *
 *	LOCKING:
 *	caller.
 */

1591
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1592 1593 1594 1595 1596 1597
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1598 1599 1600 1601 1602
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1603 1604 1605 1606 1607
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1608 1609 1610 1611 1612
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1613 1614
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1615 1616
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1617 1618
}

1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633
/**
 *	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
 */
1634
unsigned long ata_id_xfermask(const u16 *id)
1635
{
1636
	unsigned long pio_mask, mwdma_mask, udma_mask;
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647

	/* 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.
		 */
1648
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1649
		if (mode < 5)	/* Valid PIO range */
1650
			pio_mask = (2 << mode) - 1;
1651 1652
		else
			pio_mask = 1;
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662

		/* 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;
1663

1664 1665 1666 1667
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
S
Sergei Shtylyov 已提交
1668 1669
		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680

		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);
	}

1681 1682 1683
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1684 1685 1686 1687

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1688
/**
1689
 *	ata_pio_queue_task - Queue port_task
T
Tejun Heo 已提交
1690
 *	@ap: The ata_port to queue port_task for
1691
 *	@data: data for @fn to use
1692
 *	@delay: delay time in msecs for workqueue function
T
Tejun Heo 已提交
1693 1694 1695 1696 1697 1698 1699
 *
 *	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
1700
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
T
Tejun Heo 已提交
1701 1702 1703 1704 1705
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
1706
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1707
{
1708
	ap->port_task_data = data;
T
Tejun Heo 已提交
1709

1710
	/* may fail if ata_port_flush_task() in progress */
1711
	queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
T
Tejun Heo 已提交
1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
}

/**
 *	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");

1728
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1729

1730
	if (ata_msg_ctl(ap))
1731
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
T
Tejun Heo 已提交
1732 1733
}

1734
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1735
{
1736
	struct completion *waiting = qc->private_data;
1737 1738 1739 1740 1741

	complete(waiting);
}

/**
1742
 *	ata_exec_internal_sg - execute libata internal command
1743 1744
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1745
 *	@cdb: CDB for packet command
1746
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1747
 *	@sgl: sg list for the data buffer of the command
1748
 *	@n_elem: Number of sg entries
1749
 *	@timeout: Timeout in msecs (0 for default)
1750 1751 1752 1753 1754 1755 1756 1757 1758
 *
 *	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.
1759 1760 1761
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1762
 */
1763 1764
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1765
			      int dma_dir, struct scatterlist *sgl,
1766
			      unsigned int n_elem, unsigned long timeout)
1767
{
T
Tejun Heo 已提交
1768 1769
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1770
	u8 command = tf->command;
1771
	int auto_timeout = 0;
1772
	struct ata_queued_cmd *qc;
1773
	unsigned int tag, preempted_tag;
1774
	u32 preempted_sactive, preempted_qc_active;
1775
	int preempted_nr_active_links;
1776
	DECLARE_COMPLETION_ONSTACK(wait);
1777
	unsigned long flags;
1778
	unsigned int err_mask;
1779
	int rc;
1780

1781
	spin_lock_irqsave(ap->lock, flags);
1782

1783
	/* no internal command while frozen */
1784
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1785
		spin_unlock_irqrestore(ap->lock, flags);
1786 1787 1788
		return AC_ERR_SYSTEM;
	}

1789
	/* initialize internal qc */
1790

1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
	/* 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;

1801 1802
	if (test_and_set_bit(tag, &ap->qc_allocated))
		BUG();
1803
	qc = __ata_qc_from_tag(ap, tag);
1804 1805 1806 1807 1808 1809 1810

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

T
Tejun Heo 已提交
1811 1812
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1813
	preempted_qc_active = ap->qc_active;
1814
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1815 1816
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1817
	ap->qc_active = 0;
1818
	ap->nr_active_links = 0;
1819 1820

	/* prepare & issue qc */
1821
	qc->tf = *tf;
1822 1823
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1824
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1825 1826
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1827
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1828
		struct scatterlist *sg;
1829

J
Jens Axboe 已提交
1830 1831
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1832

J
Jens Axboe 已提交
1833
		ata_sg_init(qc, sgl, n_elem);
1834
		qc->nbytes = buflen;
1835 1836
	}

1837
	qc->private_data = &wait;
1838 1839
	qc->complete_fn = ata_qc_complete_internal;

1840
	ata_qc_issue(qc);
1841

1842
	spin_unlock_irqrestore(ap->lock, flags);
1843

1844 1845 1846 1847 1848 1849 1850 1851
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1852 1853

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1854 1855

	ata_port_flush_task(ap);
1856

1857
	if (!rc) {
1858
		spin_lock_irqsave(ap->lock, flags);
1859 1860 1861

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1862 1863
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1864
		 */
1865
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1866 1867 1868 1869 1870 1871
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1872

1873 1874
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1875
					"qc timeout (cmd 0x%x)\n", command);
1876 1877
		}

1878
		spin_unlock_irqrestore(ap->lock, flags);
1879 1880
	}

1881 1882 1883 1884
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
	/* 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;
1895 1896
	}

1897
	/* finish up */
1898
	spin_lock_irqsave(ap->lock, flags);
1899

1900
	*tf = qc->result_tf;
1901 1902 1903
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1904 1905
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1906
	ap->qc_active = preempted_qc_active;
1907
	ap->nr_active_links = preempted_nr_active_links;
1908

1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
	/* 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.
	 */
1920
	if (ap->flags & ATA_FLAG_DISABLED) {
1921 1922 1923 1924
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1925
	spin_unlock_irqrestore(ap->lock, flags);
1926

1927 1928 1929
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1930
	return err_mask;
1931 1932
}

1933
/**
1934
 *	ata_exec_internal - execute libata internal command
1935 1936 1937 1938 1939 1940
 *	@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
1941
 *	@timeout: Timeout in msecs (0 for default)
1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953
 *
 *	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,
1954 1955
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1956
{
1957 1958
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1959

1960 1961 1962 1963 1964 1965
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1966

1967 1968
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1969 1970
}

1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
/**
 *	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
1984
 */
1985
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1986 1987 1988 1989 1990 1991 1992 1993 1994
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1995
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1996 1997
}

1998 1999 2000 2001 2002 2003 2004 2005 2006
/**
 *	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
2007 2008 2009 2010 2011 2012 2013 2014 2015
	/* 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
2016
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
2017
		return 0;
2018 2019 2020 2021
	/* 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
2022 2023 2024 2025 2026
	/* 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))
2027
		return 1;
A
Alan Cox 已提交
2028 2029
	return 0;
}
2030

A
Alan Cox 已提交
2031 2032 2033 2034 2035 2036 2037 2038 2039
/**
 *	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)
{
2040 2041
	/* 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
2042
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
2043 2044 2045 2046
		/* 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
2047 2048
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
2049 2050
		}
	}
A
Alan Cox 已提交
2051
	return 3 << ATA_SHIFT_PIO;
2052 2053
}

2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
/**
 *	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
2071
/**
2072 2073 2074
 *	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)
2075
 *	@flags: ATA_READID_* flags
2076
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
2077
 *
2078 2079
 *	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
2080 2081
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
2082
 *
2083
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2084
 *	now we abort if we hit that case.
2085
 *
L
Linus Torvalds 已提交
2086
 *	LOCKING:
2087 2088 2089 2090
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2091
 */
2092
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2093
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
2094
{
T
Tejun Heo 已提交
2095
	struct ata_port *ap = dev->link->ap;
2096
	unsigned int class = *p_class;
2097
	struct ata_taskfile tf;
2098 2099
	unsigned int err_mask = 0;
	const char *reason;
T
Tejun Heo 已提交
2100
	bool is_semb = class == ATA_DEV_SEMB;
2101
	int may_fallback = 1, tried_spinup = 0;
2102
	int rc;
L
Linus Torvalds 已提交
2103

2104
	if (ata_msg_ctl(ap))
2105
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2106

2107
retry:
T
Tejun Heo 已提交
2108
	ata_tf_init(dev, &tf);
2109

2110
	switch (class) {
T
Tejun Heo 已提交
2111 2112
	case ATA_DEV_SEMB:
		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
2113
	case ATA_DEV_ATA:
2114
		tf.command = ATA_CMD_ID_ATA;
2115 2116
		break;
	case ATA_DEV_ATAPI:
2117
		tf.command = ATA_CMD_ID_ATAPI;
2118 2119 2120 2121 2122
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
2123 2124
	}

2125
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
2126 2127 2128 2129 2130 2131 2132 2133 2134 2135

	/* 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
2136

2137 2138 2139 2140 2141
	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);

2142
	if (err_mask) {
2143
		if (err_mask & AC_ERR_NODEV_HINT) {
2144 2145
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
2146 2147 2148
			return -ENOENT;
		}

T
Tejun Heo 已提交
2149 2150 2151 2152 2153 2154 2155 2156
		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;
		}

2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
		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;
2180 2181
		}

2182 2183
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
2184 2185 2186
		goto err_out;
	}

2187 2188 2189 2190 2191
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

2192
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
2193

2194
	/* sanity check */
2195
	rc = -EINVAL;
A
Alan Cox 已提交
2196
	reason = "device reports invalid type";
2197 2198 2199 2200 2201 2202 2203

	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;
2204 2205
	}

2206 2207 2208 2209 2210 2211 2212
	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.
		 */
2213
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2214
		if (err_mask && id[2] != 0x738c) {
2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226
			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;
	}

2227
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2228 2229 2230
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2231 2232
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2233 2234
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2235 2236
		 *
		 * Note that ATA4 says lba is mandatory so the second check
2237
		 * should never trigger.
2238 2239
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2240
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2241 2242 2243 2244 2245 2246 2247 2248 2249
			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.
			 */
2250
			flags &= ~ATA_READID_POSTRESET;
2251 2252 2253 2254 2255
			goto retry;
		}
	}

	*p_class = class;
2256

2257 2258 2259
	return 0;

 err_out:
T
Tejun Heo 已提交
2260
	if (ata_msg_warn(ap))
2261
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2262
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2263 2264 2265
	return rc;
}

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 2292 2293 2294 2295 2296 2297 2298 2299
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
2300
static inline u8 ata_dev_knobble(struct ata_device *dev)
2301
{
T
Tejun Heo 已提交
2302
	struct ata_port *ap = dev->link->ap;
2303 2304 2305 2306

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

T
Tejun Heo 已提交
2307
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2308 2309
}

2310
static int ata_dev_config_ncq(struct ata_device *dev,
2311 2312
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2313
	struct ata_port *ap = dev->link->ap;
2314
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2315 2316
	unsigned int err_mask;
	char *aa_desc = "";
2317 2318 2319

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2320
		return 0;
2321
	}
T
Tejun Heo 已提交
2322
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2323
		snprintf(desc, desc_sz, "NCQ (not used)");
2324
		return 0;
2325
	}
2326
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2327
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2328 2329 2330
		dev->flags |= ATA_DFLAG_NCQ;
	}

2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346
	if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
		(ap->flags & ATA_FLAG_FPDMA_AA) &&
		ata_id_has_fpdma_aa(dev->id)) {
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
			SATA_FPDMA_AA);
		if (err_mask) {
			ata_dev_printk(dev, KERN_ERR, "failed to enable AA"
				"(error_mask=0x%x)\n", err_mask);
			if (err_mask != AC_ERR_DEV) {
				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
				return -EIO;
			}
		} else
			aa_desc = ", AA";
	}

2347
	if (hdepth >= ddepth)
2348
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2349
	else
2350 2351 2352
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
	return 0;
2353 2354
}

2355
/**
2356 2357 2358 2359 2360
 *	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.
2361 2362
 *
 *	LOCKING:
2363 2364 2365 2366
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2367
 */
2368
int ata_dev_configure(struct ata_device *dev)
2369
{
T
Tejun Heo 已提交
2370 2371
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2372
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2373
	const u16 *id = dev->id;
2374
	unsigned long xfer_mask;
2375
	char revbuf[7];		/* XYZ-99\0 */
2376 2377
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2378
	int rc;
2379

2380
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2381
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2382
			       __func__);
2383
		return 0;
2384 2385
	}

2386
	if (ata_msg_probe(ap))
2387
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2388

T
Tejun Heo 已提交
2389 2390
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2391
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2392

2393 2394 2395 2396 2397 2398 2399
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2400 2401 2402 2403 2404 2405 2406 2407 2408 2409
	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;
	}

2410 2411 2412 2413
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2414 2415 2416 2417
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2418

T
Tejun Heo 已提交
2419 2420 2421 2422 2423
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2424
	/* print device capabilities */
2425
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2426 2427 2428
		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",
2429
			       __func__,
2430 2431
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2432

2433
	/* initialize to-be-configured parameters */
2434
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2435 2436 2437 2438 2439 2440
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2441
	dev->multi_count = 0;
2442

L
Linus Torvalds 已提交
2443 2444 2445 2446
	/*
	 * common ATA, ATAPI feature tests
	 */

2447
	/* find max transfer mode; for printk only */
2448
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2449

2450 2451
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2452

2453 2454 2455 2456 2457 2458 2459
	/* 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
2460 2461
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2462
		if (ata_id_is_cfa(id)) {
S
Sergei Shtylyov 已提交
2463 2464
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
T
Tejun Heo 已提交
2465 2466 2467
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2468
			snprintf(revbuf, 7, "CFA");
2469
		} else {
2470
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2471 2472 2473 2474 2475 2476
			/* 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");
		}
2477

2478
		dev->n_sectors = ata_id_n_sectors(id);
2479

2480 2481 2482 2483 2484 2485 2486 2487 2488
		/* 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;
		}
2489

2490
		if (ata_id_has_lba(id)) {
2491
			const char *lba_desc;
2492
			char ncq_desc[24];
2493

2494 2495
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2496
			if (ata_id_has_lba48(id)) {
2497
				dev->flags |= ATA_DFLAG_LBA48;
2498
				lba_desc = "LBA48";
2499 2500 2501 2502

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2503
			}
2504

2505
			/* config NCQ */
2506 2507 2508
			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
			if (rc)
				return rc;
2509

2510
			/* print device info to dmesg */
2511 2512 2513 2514 2515 2516 2517
			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",
2518
					(unsigned long long)dev->n_sectors,
2519 2520
					dev->multi_count, lba_desc, ncq_desc);
			}
2521
		} else {
2522 2523 2524
			/* CHS */

			/* Default translation */
2525 2526 2527
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2528

2529
			if (ata_id_current_chs_valid(id)) {
2530
				/* Current CHS translation is valid. */
2531 2532 2533
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2534 2535 2536
			}

			/* print device info to dmesg */
2537
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2538
				ata_dev_printk(dev, KERN_INFO,
2539 2540 2541
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2542
				ata_dev_printk(dev, KERN_INFO,
2543 2544 2545 2546 2547
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2548 2549
		}

2550
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2551 2552 2553
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2554
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2555 2556
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2557
		const char *dma_dir_string = "";
2558
		u32 sntf;
2559

2560
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2561
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2562
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2563 2564
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2565
			rc = -EINVAL;
L
Linus Torvalds 已提交
2566 2567
			goto err_out_nosup;
		}
2568
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2569

2570 2571 2572 2573
		/* 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.
2574
		 */
2575
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2576
		    (!sata_pmp_attached(ap) ||
2577
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2578 2579
			unsigned int err_mask;

2580
			/* issue SET feature command to turn this on */
2581 2582
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2583
			if (err_mask)
2584
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2585 2586 2587
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2588
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2589 2590
				atapi_an_string = ", ATAPI AN";
			}
2591 2592
		}

2593
		if (ata_id_cdb_intr(dev->id)) {
2594
			dev->flags |= ATA_DFLAG_CDB_INTR;
2595 2596
			cdb_intr_string = ", CDB intr";
		}
2597

2598 2599 2600 2601 2602
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2603
		/* print device info to dmesg */
2604
		if (ata_msg_drv(ap) && print_info)
2605
			ata_dev_printk(dev, KERN_INFO,
2606
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2607
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2608
				       ata_mode_string(xfer_mask),
2609 2610
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2611 2612
	}

2613 2614 2615 2616 2617
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2618 2619 2620 2621 2622 2623 2624
	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;
	}

2625 2626
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2627
	if (ata_dev_knobble(dev)) {
2628
		if (ata_msg_drv(ap) && print_info)
2629 2630
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2631
		dev->udma_mask &= ATA_UDMA5;
2632 2633 2634
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2635
	if ((dev->class == ATA_DEV_ATAPI) &&
2636
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2637
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2638 2639
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2640

T
Tejun Heo 已提交
2641
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2642 2643
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2644

2645 2646 2647 2648 2649 2650 2651
	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;
	}

2652
	if (ap->ops->dev_config)
2653
		ap->ops->dev_config(dev);
2654

2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669
	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");
		}
	}

2670 2671 2672 2673 2674 2675 2676
	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");
	}

2677
	return 0;
L
Linus Torvalds 已提交
2678 2679

err_out_nosup:
2680
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2681
		ata_dev_printk(dev, KERN_DEBUG,
2682
			       "%s: EXIT, err\n", __func__);
2683
	return rc;
L
Linus Torvalds 已提交
2684 2685
}

A
Alan Cox 已提交
2686
/**
2687
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2688 2689
 *	@ap: port
 *
2690
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2691 2692 2693 2694 2695 2696 2697 2698 2699
 *	detection.
 */

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

/**
2700
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2701 2702
 *	@ap: port
 *
2703
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723
 *	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
2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735
/**
 *	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
2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747
/**
 *	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
2748 2749 2750 2751
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2752 2753 2754 2755
 *	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
2756
 *	LOCKING:
J
Jeff Garzik 已提交
2757
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2758 2759
 *
 *	RETURNS:
2760
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2761 2762
 */

2763
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2764
{
2765
	unsigned int classes[ATA_MAX_DEVICES];
2766
	int tries[ATA_MAX_DEVICES];
2767
	int rc;
2768
	struct ata_device *dev;
L
Linus Torvalds 已提交
2769

2770
	ata_port_probe(ap);
2771

T
Tejun Heo 已提交
2772
	ata_for_each_dev(dev, &ap->link, ALL)
2773
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2774 2775

 retry:
T
Tejun Heo 已提交
2776
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794
		/* 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);
	}

2795
	/* reset and determine device classes */
2796
	ap->ops->phy_reset(ap);
2797

T
Tejun Heo 已提交
2798
	ata_for_each_dev(dev, &ap->link, ALL) {
2799 2800 2801 2802 2803
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2804

2805
		dev->class = ATA_DEV_UNKNOWN;
2806
	}
L
Linus Torvalds 已提交
2807

2808
	ata_port_probe(ap);
2809

2810 2811 2812 2813
	/* 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
2814
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2815 2816
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2817

2818
		if (!ata_dev_enabled(dev))
2819 2820
			continue;

2821 2822
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2823 2824
		if (rc)
			goto fail;
2825 2826
	}

A
Alan Cox 已提交
2827 2828 2829 2830
	/* 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
2831 2832 2833 2834 2835 2836
	/* 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
2837 2838 2839
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2840 2841 2842
	/* 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
2843
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2844
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2845
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2846
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2847 2848
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2849 2850
	}

2851
	/* configure transfer mode */
2852
	rc = ata_set_mode(&ap->link, &dev);
2853
	if (rc)
2854
		goto fail;
L
Linus Torvalds 已提交
2855

T
Tejun Heo 已提交
2856 2857
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2858

2859 2860
	/* no device present, disable port */
	ata_port_disable(ap);
2861
	return -ENODEV;
2862 2863

 fail:
2864 2865
	tries[dev->devno]--;

2866 2867
	switch (rc) {
	case -EINVAL:
2868
		/* eeek, something went very wrong, give up */
2869 2870
		tries[dev->devno] = 0;
		break;
2871 2872 2873 2874

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2875
	case -EIO:
2876 2877 2878 2879
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2880
			sata_down_spd_limit(&ap->link, 0);
2881 2882
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2883 2884
	}

2885
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2886
		ata_dev_disable(dev);
2887

2888
	goto retry;
L
Linus Torvalds 已提交
2889 2890 2891
}

/**
J
Jeff Garzik 已提交
2892 2893
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2894
 *
J
Jeff Garzik 已提交
2895 2896 2897
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2898
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2899
 *	serialization.
L
Linus Torvalds 已提交
2900 2901 2902 2903
 */

void ata_port_probe(struct ata_port *ap)
{
2904
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2905 2906
}

2907 2908
/**
 *	sata_print_link_status - Print SATA link status
2909
 *	@link: SATA link to printk link status about
2910 2911 2912 2913 2914 2915
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2916
static void sata_print_link_status(struct ata_link *link)
2917
{
2918
	u32 sstatus, scontrol, tmp;
2919

2920
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2921
		return;
2922
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2923

T
Tejun Heo 已提交
2924
	if (ata_phys_link_online(link)) {
2925
		tmp = (sstatus >> 4) & 0xf;
2926
		ata_link_printk(link, KERN_INFO,
2927 2928
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2929
	} else {
2930
		ata_link_printk(link, KERN_INFO,
2931 2932
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2933 2934 2935
	}
}

2936 2937 2938 2939 2940 2941 2942
/**
 *	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
 */
2943

T
Tejun Heo 已提交
2944
struct ata_device *ata_dev_pair(struct ata_device *adev)
2945
{
T
Tejun Heo 已提交
2946 2947
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2948
	if (!ata_dev_enabled(pair))
2949 2950 2951 2952
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2953
/**
J
Jeff Garzik 已提交
2954 2955
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2956
 *
J
Jeff Garzik 已提交
2957 2958 2959 2960 2961
 *	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
2962
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2963
 *	serialization.
L
Linus Torvalds 已提交
2964 2965 2966 2967
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2968 2969
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2970
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2971 2972
}

2973
/**
2974
 *	sata_down_spd_limit - adjust SATA spd limit downward
2975
 *	@link: Link to adjust SATA spd limit for
2976
 *	@spd_limit: Additional limit
2977
 *
2978
 *	Adjust SATA spd limit of @link downward.  Note that this
2979
 *	function only adjusts the limit.  The change must be applied
2980
 *	using sata_set_spd().
2981
 *
2982 2983 2984 2985 2986
 *	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.
 *
2987 2988 2989 2990 2991 2992
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2993
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2994
{
2995
	u32 sstatus, spd, mask;
2996
	int rc, bit;
2997

2998
	if (!sata_scr_valid(link))
2999 3000 3001
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
3002
	 * If not, use cached value in link->sata_spd.
3003
	 */
3004
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3005
	if (rc == 0 && ata_sstatus_online(sstatus))
3006 3007
		spd = (sstatus >> 4) & 0xf;
	else
3008
		spd = link->sata_spd;
3009

3010
	mask = link->sata_spd_limit;
3011 3012
	if (mask <= 1)
		return -EINVAL;
3013 3014

	/* unconditionally mask off the highest bit */
3015 3016
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
3017

3018 3019 3020 3021 3022 3023 3024 3025 3026
	/* 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? */
3027 3028 3029
	if (!mask)
		return -EINVAL;

3030 3031 3032 3033 3034 3035 3036 3037 3038
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

3039
	link->sata_spd_limit = mask;
3040

3041
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
3042
			sata_spd_string(fls(mask)));
3043 3044 3045 3046

	return 0;
}

3047
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3048
{
3049 3050
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
3051

3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062
	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;
3063
	else
3064
		target = fls(limit);
3065 3066

	spd = (*scontrol >> 4) & 0xf;
3067
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3068

3069
	return spd != target;
3070 3071 3072
}

/**
3073
 *	sata_set_spd_needed - is SATA spd configuration needed
3074
 *	@link: Link in question
3075 3076
 *
 *	Test whether the spd limit in SControl matches
3077
 *	@link->sata_spd_limit.  This function is used to determine
3078 3079 3080 3081 3082 3083 3084 3085 3086
 *	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
3087
static int sata_set_spd_needed(struct ata_link *link)
3088 3089 3090
{
	u32 scontrol;

3091
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3092
		return 1;
3093

3094
	return __sata_set_spd_needed(link, &scontrol);
3095 3096 3097
}

/**
3098
 *	sata_set_spd - set SATA spd according to spd limit
3099
 *	@link: Link to set SATA spd for
3100
 *
3101
 *	Set SATA spd of @link according to sata_spd_limit.
3102 3103 3104 3105 3106 3107
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
3108
 *	changed.  Negative errno if SCR registers are inaccessible.
3109
 */
3110
int sata_set_spd(struct ata_link *link)
3111 3112
{
	u32 scontrol;
3113
	int rc;
3114

3115
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3116
		return rc;
3117

3118
	if (!__sata_set_spd_needed(link, &scontrol))
3119 3120
		return 0;

3121
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3122 3123
		return rc;

3124 3125 3126
	return 1;
}

A
Alan Cox 已提交
3127 3128 3129 3130 3131
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
3132
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
3133
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3134 3135 3136
 * 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
3137 3138 3139
 */

static const struct ata_timing ata_timing[] = {
3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166
/*	{ 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
3167 3168 3169 3170

	{ 0xFF }
};

3171 3172
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
3173 3174 3175

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
3176 3177 3178 3179 3180 3181 3182 3183 3184
	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
3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195
}

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);
3196
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
3197 3198 3199 3200
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

3201
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
3202
{
3203 3204 3205 3206
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
3207

3208 3209 3210
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
3211 3212 3213 3214 3215
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
3216
	const u16 *id = adev->id;
A
Alan Cox 已提交
3217 3218 3219 3220
	const struct ata_timing *s;
	struct ata_timing p;

	/*
3221
	 * Find the mode.
3222
	 */
A
Alan Cox 已提交
3223 3224 3225 3226

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

3227 3228
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
3229 3230 3231 3232 3233
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

3234
	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
A
Alan Cox 已提交
3235
		memset(&p, 0, sizeof(p));
3236

3237
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
3238 3239 3240 3241 3242 3243 3244 3245
			if (speed <= XFER_PIO_2)
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
			else if ((speed <= XFER_PIO_4) ||
				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
			p.cycle = id[ATA_ID_EIDE_DMA_MIN];

A
Alan Cox 已提交
3246 3247 3248 3249 3250 3251 3252
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

3253
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3254 3255

	/*
3256 3257 3258
	 * 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
3259 3260
	 */

3261
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3262 3263 3264 3265 3266
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3267
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278
	 */

	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
3279

3280 3281 3282 3283 3284
	/* 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
3285 3286 3287 3288

	return 0;
}

3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339
/**
 *	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;
}

3340 3341 3342
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3343
 *	@sel: ATA_DNXFER_* selector
3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354
 *
 *	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
 */
3355
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3356
{
3357
	char buf[32];
3358 3359
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3360
	int quiet, highbit;
3361

3362 3363
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3364

3365 3366 3367 3368
	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);
3369

3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
	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);
	}
3422 3423 3424 3425 3426 3427 3428

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

	return 0;
}

T
Tejun Heo 已提交
3429
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3430
{
3431
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3432
	struct ata_eh_context *ehc = &dev->link->eh_context;
3433
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3434 3435
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3436
	unsigned int err_mask = 0;
3437
	int rc;
L
Linus Torvalds 已提交
3438

3439
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3440 3441 3442
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3443 3444 3445 3446 3447 3448 3449 3450 3451
	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);
	}
3452

3453 3454 3455 3456 3457 3458 3459 3460 3461 3462
	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;

3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477
	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;
	}
3478 3479
	/* 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 */
3480
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3481 3482
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3483
		ign_dev_err = 1;
3484

3485 3486 3487
	/* 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
3488

3489 3490 3491 3492 3493 3494
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3495

3496 3497
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3498

3499 3500 3501 3502
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3503
	return 0;
3504 3505 3506 3507 3508

 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
3509 3510 3511
}

/**
3512
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3513
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3514
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3515
 *
3516 3517 3518
 *	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
3519
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3520
 *
L
Linus Torvalds 已提交
3521
 *	LOCKING:
J
Jeff Garzik 已提交
3522
 *	PCI/etc. bus probe sem.
3523 3524 3525
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3526
 */
3527

3528
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3529
{
3530
	struct ata_port *ap = link->ap;
3531
	struct ata_device *dev;
3532
	int rc = 0, used_dma = 0, found = 0;
3533

3534
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3535
	ata_for_each_dev(dev, link, ENABLED) {
3536
		unsigned long pio_mask, dma_mask;
3537
		unsigned int mode_mask;
3538

3539 3540 3541 3542 3543 3544
		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
3545
		ata_dev_xfermask(dev);
3546
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3547

3548 3549
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3550 3551 3552 3553 3554 3555

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

3556 3557
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3558

3559
		found = 1;
3560
		if (ata_dma_enabled(dev))
3561
			used_dma = 1;
3562
	}
3563
	if (!found)
3564
		goto out;
3565 3566

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3567
	ata_for_each_dev(dev, link, ENABLED) {
3568
		if (dev->pio_mode == 0xff) {
3569
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3570
			rc = -EINVAL;
3571
			goto out;
3572 3573 3574 3575 3576 3577 3578
		}

		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
3579

3580
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3581 3582
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3583 3584 3585 3586 3587 3588 3589
			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
3590 3591

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3592
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3593
		rc = ata_dev_set_mode(dev);
3594
		if (rc)
3595
			goto out;
3596
	}
L
Linus Torvalds 已提交
3597

3598 3599
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3600
	 */
J
Jeff Garzik 已提交
3601
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3602
		ap->host->simplex_claimed = ap;
3603

3604 3605 3606 3607
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
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
/**
 *	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;
3634
	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3635 3636
	int warned = 0;

T
Tejun Heo 已提交
3637 3638 3639 3640 3641 3642
	/* 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);

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 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704
	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.
 */
3705
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3706 3707
				int (*check_ready)(struct ata_link *link))
{
3708
	msleep(ATA_WAIT_AFTER_RESET);
3709 3710 3711 3712

	return ata_wait_ready(link, deadline, check_ready);
}

3713
/**
3714 3715
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3716
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3717
 *	@deadline: deadline jiffies for the operation
3718
 *
3719
*	Make sure SStatus of @link reaches stable state, determined by
3720 3721
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3722 3723
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3724 3725
 *	until timeout then returns 0 if DET is stable at 1.
 *
3726 3727 3728
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3729 3730 3731 3732 3733 3734
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3735 3736
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3737
{
3738 3739
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3740
	unsigned long last_jiffies, t;
3741 3742 3743
	u32 last, cur;
	int rc;

3744
	t = ata_deadline(jiffies, params[2]);
3745 3746 3747
	if (time_before(t, deadline))
		deadline = t;

3748
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3749 3750 3751 3752 3753 3754 3755
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3756
		msleep(interval);
3757
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3758 3759 3760 3761 3762
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3763
			if (cur == 1 && time_before(jiffies, deadline))
3764
				continue;
3765 3766
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3767 3768 3769 3770 3771 3772 3773 3774
				return 0;
			continue;
		}

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

3775 3776 3777
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3778
		if (time_after(jiffies, deadline))
3779
			return -EPIPE;
3780 3781 3782 3783
	}
}

/**
3784 3785
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3786
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3787
 *	@deadline: deadline jiffies for the operation
3788
 *
3789
 *	Resume SATA phy @link and debounce it.
3790 3791 3792 3793 3794 3795 3796
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3797 3798
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3799
{
3800
	int tries = ATA_LINK_RESUME_TRIES;
3801
	u32 scontrol, serror;
3802 3803
	int rc;

3804
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3805
		return rc;
3806

3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821
	/*
	 * Writes to SControl sometimes get ignored under certain
	 * controllers (ata_piix SIDPR).  Make sure DET actually is
	 * cleared.
	 */
	do {
		scontrol = (scontrol & 0x0f0) | 0x300;
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
			return rc;
		/*
		 * Some PHYs react badly if SStatus is pounded
		 * immediately after resuming.  Delay 200ms before
		 * debouncing.
		 */
		msleep(200);
3822

3823 3824 3825 3826
		/* is SControl restored correctly? */
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
			return rc;
	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3827

3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838
	if ((scontrol & 0xf0f) != 0x300) {
		ata_link_printk(link, KERN_ERR,
				"failed to resume link (SControl %X)\n",
				scontrol);
		return 0;
	}

	if (tries < ATA_LINK_RESUME_TRIES)
		ata_link_printk(link, KERN_WARNING,
				"link resume succeeded after %d retries\n",
				ATA_LINK_RESUME_TRIES - tries);
3839

3840 3841 3842
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3843
	/* clear SError, some PHYs require this even for SRST to work */
3844 3845 3846
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3847
	return rc != -EINVAL ? rc : 0;
3848 3849
}

3850
/**
3851
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3852
 *	@link: ATA link to be reset
3853
 *	@deadline: deadline jiffies for the operation
3854
 *
T
Tejun Heo 已提交
3855
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3856 3857 3858 3859
 *	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.
3860 3861 3862 3863 3864 3865 3866
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3867
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3868
{
T
Tejun Heo 已提交
3869
	struct ata_port *ap = link->ap;
3870
	struct ata_eh_context *ehc = &link->eh_context;
3871
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3872 3873 3874 3875 3876 3877
	int rc;

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

3878
	/* if SATA, resume link */
3879
	if (ap->flags & ATA_FLAG_SATA) {
3880
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3881 3882
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3883
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3884 3885 3886
					"link for reset (errno=%d)\n", rc);
	}

3887
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3888
	if (ata_phys_link_offline(link))
3889 3890
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3891 3892 3893
	return 0;
}

3894
/**
T
Tejun Heo 已提交
3895 3896 3897
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3898
 *	@deadline: deadline jiffies for the operation
3899 3900
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3901
 *
T
Tejun Heo 已提交
3902
 *	SATA phy-reset @link using DET bits of SControl register.
3903 3904 3905 3906 3907 3908 3909 3910
 *	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.
3911 3912 3913 3914 3915 3916 3917
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3918
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3919 3920
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3921
{
T
Tejun Heo 已提交
3922
	u32 scontrol;
3923
	int rc;
3924

3925 3926
	DPRINTK("ENTER\n");

3927 3928 3929
	if (online)
		*online = false;

3930
	if (sata_set_spd_needed(link)) {
3931 3932 3933 3934 3935
		/* 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.
		 */
3936
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3937
			goto out;
3938

3939
		scontrol = (scontrol & 0x0f0) | 0x304;
3940

3941
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3942
			goto out;
3943

3944
		sata_set_spd(link);
3945 3946 3947
	}

	/* issue phy wake/reset */
3948
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3949
		goto out;
3950

3951
	scontrol = (scontrol & 0x0f0) | 0x301;
3952

3953
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3954
		goto out;
3955

3956
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3957 3958 3959 3960
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3961 3962
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3963 3964 3965
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3966
	if (ata_phys_link_offline(link))
3967 3968 3969 3970 3971 3972
		goto out;

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

T
Tejun Heo 已提交
3973
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3974 3975 3976 3977 3978 3979 3980 3981
		/* 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;

3982 3983
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994
			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);
3995
 out:
3996 3997 3998 3999
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
4000 4001
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
4002
	}
4003 4004 4005 4006
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032
/**
 *	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;
}

4033
/**
4034
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
4035
 *	@link: the target ata_link
4036 4037 4038 4039 4040 4041 4042 4043 4044
 *	@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)
 */
4045
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
4046
{
4047 4048
	u32 serror;

4049 4050
	DPRINTK("ENTER\n");

4051 4052 4053 4054
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

4055
	/* print link status */
4056
	sata_print_link_status(link);
4057 4058 4059 4060

	DPRINTK("EXIT\n");
}

4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076
/**
 *	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
4077 4078
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
4079 4080
{
	const u16 *old_id = dev->id;
4081 4082
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4083 4084

	if (dev->class != new_class) {
4085 4086
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
4087 4088 4089
		return 0;
	}

4090 4091 4092 4093
	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]));
4094 4095

	if (strcmp(model[0], model[1])) {
4096 4097
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
4098 4099 4100 4101
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
4102 4103
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
4104 4105 4106 4107 4108 4109 4110
		return 0;
	}

	return 1;
}

/**
4111
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
4112
 *	@dev: target ATA device
4113
 *	@readid_flags: read ID flags
4114 4115 4116 4117 4118 4119 4120 4121 4122 4123
 *
 *	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
 */
4124
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4125
{
4126
	unsigned int class = dev->class;
T
Tejun Heo 已提交
4127
	u16 *id = (void *)dev->link->ap->sector_buf;
4128 4129
	int rc;

4130
	/* read ID data */
4131
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4132
	if (rc)
4133
		return rc;
4134 4135

	/* is the device still there? */
4136 4137
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
4138

4139
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4140 4141 4142 4143 4144 4145
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4146
 *	@new_class: new class code
4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157
 *	@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
 */
4158 4159
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4160
{
4161
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
4162
	u64 n_native_sectors = dev->n_native_sectors;
4163 4164 4165 4166 4167
	int rc;

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

4168 4169
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
4170 4171 4172
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
4173 4174 4175 4176 4177 4178
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

4179 4180 4181 4182
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4183 4184

	/* configure device according to the new ID */
4185
	rc = ata_dev_configure(dev);
4186 4187 4188 4189
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
T
Tejun Heo 已提交
4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211
	if (dev->class != ATA_DEV_ATA || !n_sectors ||
	    dev->n_sectors == n_sectors)
		return 0;

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

	/*
	 * Something could have caused HPA to be unlocked
	 * involuntarily.  If n_native_sectors hasn't changed and the
	 * new size matches it, keep the device.
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
		ata_dev_printk(dev, KERN_WARNING,
			       "new n_sectors matches native, probably "
			       "late HPA unlock, continuing\n");
		/* keep using the old n_sectors */
		dev->n_sectors = n_sectors;
		return 0;
4212 4213
	}

T
Tejun Heo 已提交
4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230
	/*
	 * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
	 * unlocking HPA in those cases.
	 *
	 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
	    !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
		ata_dev_printk(dev, KERN_WARNING,
			       "old n_sectors matches native, probably "
			       "late HPA lock, will try to unlock HPA\n");
		/* try unlocking HPA */
		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
		rc = -EIO;
	} else
		rc = -ENODEV;
4231

T
Tejun Heo 已提交
4232 4233 4234
	/* restore original n_[native_]sectors and fail */
	dev->n_native_sectors = n_native_sectors;
	dev->n_sectors = n_sectors;
4235
 fail:
4236
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4237 4238 4239
	return rc;
}

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
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 },
4276
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4277
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4278
	/* Odd clown on sil3726/4726 PMPs */
4279
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4280

4281
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4282
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4283
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4284

4285 4286 4287 4288
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4289
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4290
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4291 4292
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4293
	/* NCQ is broken */
4294
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4295
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4296
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4297
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4298
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4299

4300
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4301
	{ "ST31500341AS",	"SD15",		ATA_HORKAGE_NONCQ |
4302
						ATA_HORKAGE_FIRMWARE_WARN },
4303
	{ "ST31500341AS",	"SD16",		ATA_HORKAGE_NONCQ |
4304
						ATA_HORKAGE_FIRMWARE_WARN },
4305
	{ "ST31500341AS",	"SD17",		ATA_HORKAGE_NONCQ |
4306
						ATA_HORKAGE_FIRMWARE_WARN },
4307
	{ "ST31500341AS",	"SD18",		ATA_HORKAGE_NONCQ |
4308
						ATA_HORKAGE_FIRMWARE_WARN },
4309
	{ "ST31500341AS",	"SD19",		ATA_HORKAGE_NONCQ |
4310
						ATA_HORKAGE_FIRMWARE_WARN },
4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364

	{ "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 |
4365 4366
						ATA_HORKAGE_FIRMWARE_WARN },

4367 4368 4369 4370 4371
	/* 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, },
4372

4373 4374 4375
	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },

4376 4377 4378 4379 4380
	/* 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 },
4381

T
Tejun Heo 已提交
4382 4383 4384
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4385 4386 4387
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4388
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4389

A
Alan Cox 已提交
4390 4391
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4392 4393 4394
	/* 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
4395
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4396 4397 4398
	{ "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
4399

4400 4401 4402
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4403 4404 4405
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },

4406 4407 4408 4409 4410 4411
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
	{ "PIONEER DVD-RW  DVRTD08",	"1.00",	ATA_HORKAGE_NOSETXFER },

4412 4413
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4414
};
4415

4416
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4417 4418 4419 4420 4421 4422 4423 4424 4425 4426
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4427
	else {
4428
		len = strlen(name);
4429 4430 4431 4432 4433 4434
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4435 4436 4437 4438

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4439
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4440
{
T
Tejun Heo 已提交
4441 4442
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4443
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4444

T
Tejun Heo 已提交
4445 4446
	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
4447

4448
	while (ad->model_num) {
4449
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4450 4451
			if (ad->model_rev == NULL)
				return ad->horkage;
4452
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4453
				return ad->horkage;
4454
		}
4455
		ad++;
4456
	}
L
Linus Torvalds 已提交
4457 4458 4459
	return 0;
}

4460 4461 4462 4463 4464 4465
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
4466
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4467 4468
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4469
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4470 4471
}

A
Alan Cox 已提交
4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486
/**
 *	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);
}

4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504
/**
 *	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
4505
	/* If the controller thinks we are 40 wire, we are. */
4506 4507
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4508 4509

	/* If the controller thinks we are 80 wire, we are. */
4510 4511
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4512 4513 4514 4515 4516

	/* 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
4517 4518
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4519 4520 4521 4522 4523 4524 4525 4526 4527 4528

	/* 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
4529 4530 4531
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4532 4533 4534 4535 4536 4537
				return 0;
		}
	}
	return 1;
}

4538 4539 4540 4541
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4542 4543 4544 4545
 *	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...
4546 4547 4548 4549
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4550
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4551
{
T
Tejun Heo 已提交
4552 4553
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4554
	struct ata_host *host = ap->host;
4555
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4556

4557
	/* controller modes available */
4558 4559 4560
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4561
	/* drive modes available */
4562 4563 4564
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4565

4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576
	/*
	 *	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));
	}

4577 4578
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4579 4580
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4581
	}
4582

4583
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4584
	    host->simplex_claimed && host->simplex_claimed != ap) {
4585 4586 4587
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4588
	}
4589

J
Jeff Garzik 已提交
4590 4591 4592
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4593
	if (ap->ops->mode_filter)
4594
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4595

4596 4597 4598 4599 4600 4601 4602 4603 4604 4605
	/* 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 */
4606
		if (cable_is_40wire(ap)) {
4607
			ata_dev_printk(dev, KERN_WARNING,
4608 4609 4610 4611
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4612 4613
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4614 4615 4616 4617 4618 4619
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4620 4621 4622
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4623
 *	LOCKING:
J
Jeff Garzik 已提交
4624
 *	PCI/etc. bus probe sem.
4625 4626 4627
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4628 4629
 */

T
Tejun Heo 已提交
4630
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4631
{
4632
	struct ata_taskfile tf;
4633
	unsigned int err_mask;
L
Linus Torvalds 已提交
4634 4635 4636 4637

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

T
Tejun Heo 已提交
4638 4639 4640
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4641
	ata_tf_init(dev, &tf);
4642 4643
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4644
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4645
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4646
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4647 4648
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4649 4650
	/* 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
4651
		tf.nsect = 0x01;
A
Alan Cox 已提交
4652 4653
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4654

4655
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4656 4657 4658 4659 4660

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4661
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4662 4663
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4664
 *	@feature: The sector count represents the feature to set
4665 4666
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4667
 *	on port @ap with sector count
4668 4669 4670 4671 4672 4673 4674
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4675 4676
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688
{
	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;
4689
	tf.nsect = feature;
4690

4691
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4692

4693 4694
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4695 4696
}

4697 4698 4699
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4700 4701
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4702 4703
 *
 *	LOCKING:
4704 4705 4706 4707
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4708
 */
T
Tejun Heo 已提交
4709 4710
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4711
{
4712
	struct ata_taskfile tf;
4713
	unsigned int err_mask;
4714 4715 4716

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4717
		return AC_ERR_INVALID;
4718 4719 4720 4721

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

T
Tejun Heo 已提交
4722
	ata_tf_init(dev, &tf);
4723 4724 4725 4726 4727
	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 */
4728

4729
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4730 4731 4732 4733 4734
	/* 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;
4735

4736 4737
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4738 4739
}

L
Linus Torvalds 已提交
4740
/**
J
Jeff Garzik 已提交
4741 4742 4743 4744
 *	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
4745 4746
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4747
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4748
 */
4749
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4750 4751
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4752
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4753 4754
	int dir = qc->dma_dir;

4755
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4756

4757
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4758

4759
	if (qc->n_elem)
4760
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4761 4762

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4763
	qc->sg = NULL;
L
Linus Torvalds 已提交
4764 4765 4766
}

/**
4767
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4768 4769
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4770 4771 4772 4773
 *	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
4774
 *	LOCKING:
T
Tejun Heo 已提交
4775 4776 4777 4778 4779
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4780
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4781 4782
{
	struct ata_port *ap = qc->ap;
4783

T
Tejun Heo 已提交
4784 4785 4786
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4787 4788
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4789
		return 1;
4790

T
Tejun Heo 已提交
4791 4792
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4793

T
Tejun Heo 已提交
4794 4795
	return 0;
}
L
Linus Torvalds 已提交
4796

T
Tejun Heo 已提交
4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814
/**
 *	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;
4815

T
Tejun Heo 已提交
4816 4817 4818 4819 4820 4821 4822
	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;
	}
4823

T
Tejun Heo 已提交
4824 4825
	return ATA_DEFER_LINK;
}
4826

T
Tejun Heo 已提交
4827
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4828

T
Tejun Heo 已提交
4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848
/**
 *	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;
}
4849

T
Tejun Heo 已提交
4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866
/**
 *	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
4867

T
Tejun Heo 已提交
4868
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4869

T
Tejun Heo 已提交
4870 4871 4872
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4873

T
Tejun Heo 已提交
4874
	DPRINTK("%d sg elements mapped\n", n_elem);
4875
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4876 4877
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4878

T
Tejun Heo 已提交
4879
	return 0;
L
Linus Torvalds 已提交
4880 4881
}

T
Tejun Heo 已提交
4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894
/**
 *	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)
4895
{
T
Tejun Heo 已提交
4896 4897
#ifdef __BIG_ENDIAN
	unsigned int i;
4898

T
Tejun Heo 已提交
4899 4900 4901
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4902 4903
}

4904 4905
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4906
 *	@ap: target port
4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933
 *
 *	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
4934 4935 4936 4937 4938
/**
 *	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
4939
 *	None.
L
Linus Torvalds 已提交
4940 4941
 */

4942
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4943
{
T
Tejun Heo 已提交
4944
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4945 4946
	struct ata_queued_cmd *qc;

4947
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4948 4949 4950 4951 4952
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4953
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4954 4955 4956 4957 4958
	}

	return qc;
}

4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970
/**
 *	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)
{
4971
	struct ata_port *ap;
4972 4973
	unsigned int tag;

4974
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4975
	ap = qc->ap;
4976 4977 4978 4979 4980 4981 4982 4983 4984

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

4985
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4986
{
4987 4988
	struct ata_port *ap;
	struct ata_link *link;
4989

4990 4991
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4992 4993
	ap = qc->ap;
	link = qc->dev->link;
L
Linus Torvalds 已提交
4994 4995 4996 4997

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

4998
	/* command should be marked inactive atomically with qc completion */
4999
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5000
		link->sactive &= ~(1 << qc->tag);
5001 5002 5003
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
5004
		link->active_tag = ATA_TAG_POISON;
5005 5006 5007 5008 5009 5010 5011
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
5012

5013 5014 5015 5016 5017
	/* 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;
5018
	ap->qc_active &= ~(1 << qc->tag);
5019

L
Linus Torvalds 已提交
5020
	/* call completion callback */
5021
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5022 5023
}

5024 5025 5026 5027 5028
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5029
	ap->ops->qc_fill_rtf(qc);
5030 5031
}

5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047
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;
}

5048 5049 5050 5051 5052 5053 5054 5055
/**
 *	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
5056
 *	spin_lock_irqsave(host lock)
5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075
 */
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) {
5076 5077 5078
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

5079 5080 5081 5082
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5083 5084 5085 5086
			/* always fill result TF for failed qc */
			fill_result_tf(qc);

			if (!ata_tag_internal(qc->tag))
5087
				ata_qc_schedule_eh(qc);
5088 5089 5090
			else
				__ata_qc_complete(qc);
			return;
5091 5092
		}

5093 5094
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

5095 5096
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5097
			fill_result_tf(qc);
5098

5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113
		/* 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;
5114 5115 5116 5117

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
5118 5119
		}

5120 5121 5122
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

5123 5124 5125 5126 5127 5128 5129
		__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)
5130
			fill_result_tf(qc);
5131 5132 5133 5134 5135

		__ata_qc_complete(qc);
	}
}

5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146
/**
 *	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
5147
 *	spin_lock_irqsave(host lock)
5148 5149 5150 5151
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
5152
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164
{
	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;
	}

5165
	while (done_mask) {
5166
		struct ata_queued_cmd *qc;
5167
		unsigned int tag = __ffs(done_mask);
5168

5169 5170
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
5171 5172 5173
			ata_qc_complete(qc);
			nr_done++;
		}
5174
		done_mask &= ~(1 << tag);
5175 5176 5177 5178 5179
	}

	return nr_done;
}

L
Linus Torvalds 已提交
5180 5181 5182 5183 5184 5185 5186 5187 5188 5189
/**
 *	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
5190
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5191
 */
5192
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5193 5194
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5195
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
5196
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5197

5198 5199 5200 5201
	/* 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.
	 */
5202
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5203

5204
	if (ata_is_ncq(prot)) {
5205
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5206 5207 5208

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5209
		link->sactive |= 1 << qc->tag;
5210
	} else {
5211
		WARN_ON_ONCE(link->sactive);
5212 5213

		ap->nr_active_links++;
T
Tejun Heo 已提交
5214
		link->active_tag = qc->tag;
5215 5216
	}

5217
	qc->flags |= ATA_QCFLAG_ACTIVE;
5218
	ap->qc_active |= 1 << qc->tag;
5219

5220 5221 5222
	/* 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
5223
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5224

T
Tejun Heo 已提交
5225
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5226
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5227 5228
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
5229

T
Tejun Heo 已提交
5230
	/* if device is sleeping, schedule reset and abort the link */
5231
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5232
		link->eh_info.action |= ATA_EH_RESET;
5233 5234 5235 5236 5237
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5238 5239
	ap->ops->qc_prep(qc);

5240 5241 5242 5243
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5244

5245
sg_err:
5246 5247 5248
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5249 5250
}

5251 5252
/**
 *	sata_scr_valid - test whether SCRs are accessible
5253
 *	@link: ATA link to test SCR accessibility for
5254
 *
5255
 *	Test whether SCRs are accessible for @link.
5256 5257 5258 5259 5260 5261 5262
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5263
int sata_scr_valid(struct ata_link *link)
5264
{
5265 5266
	struct ata_port *ap = link->ap;

5267
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5268 5269 5270 5271
}

/**
 *	sata_scr_read - read SCR register of the specified port
5272
 *	@link: ATA link to read SCR for
5273 5274 5275
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5276
 *	Read SCR register @reg of @link into *@val.  This function is
5277 5278
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5279 5280
 *
 *	LOCKING:
5281
 *	None if @link is ap->link.  Kernel thread context otherwise.
5282 5283 5284 5285
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5286
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5287
{
5288 5289
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5290
			return link->ap->ops->scr_read(link, reg, val);
5291 5292 5293 5294
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5295 5296 5297 5298
}

/**
 *	sata_scr_write - write SCR register of the specified port
5299
 *	@link: ATA link to write SCR for
5300 5301 5302
 *	@reg: SCR to write
 *	@val: value to write
 *
5303
 *	Write @val to SCR register @reg of @link.  This function is
5304 5305
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5306 5307
 *
 *	LOCKING:
5308
 *	None if @link is ap->link.  Kernel thread context otherwise.
5309 5310 5311 5312
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5313
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5314
{
5315 5316
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5317
			return link->ap->ops->scr_write(link, reg, val);
5318 5319
		return -EOPNOTSUPP;
	}
5320

5321
	return sata_pmp_scr_write(link, reg, val);
5322 5323 5324 5325
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5326
 *	@link: ATA link to write SCR for
5327 5328 5329 5330 5331 5332 5333
 *	@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:
5334
 *	None if @link is ap->link.  Kernel thread context otherwise.
5335 5336 5337 5338
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5339
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5340
{
5341 5342
	if (ata_is_host_link(link)) {
		int rc;
5343

5344
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5345
			rc = link->ap->ops->scr_write(link, reg, val);
5346
			if (rc == 0)
T
Tejun Heo 已提交
5347
				rc = link->ap->ops->scr_read(link, reg, &val);
5348 5349 5350
			return rc;
		}
		return -EOPNOTSUPP;
5351
	}
5352 5353

	return sata_pmp_scr_write(link, reg, val);
5354 5355 5356
}

/**
T
Tejun Heo 已提交
5357
 *	ata_phys_link_online - test whether the given link is online
5358
 *	@link: ATA link to test
5359
 *
5360 5361 5362
 *	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).
5363 5364 5365 5366 5367
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5368
 *	True if the port online status is available and online.
5369
 */
T
Tejun Heo 已提交
5370
bool ata_phys_link_online(struct ata_link *link)
5371 5372 5373
{
	u32 sstatus;

5374
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5375
	    ata_sstatus_online(sstatus))
5376 5377
		return true;
	return false;
5378 5379 5380
}

/**
T
Tejun Heo 已提交
5381
 *	ata_phys_link_offline - test whether the given link is offline
5382
 *	@link: ATA link to test
5383
 *
5384 5385 5386
 *	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).
5387 5388 5389 5390 5391
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5392
 *	True if the port offline status is available and offline.
5393
 */
T
Tejun Heo 已提交
5394
bool ata_phys_link_offline(struct ata_link *link)
5395 5396 5397
{
	u32 sstatus;

5398
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5399
	    !ata_sstatus_online(sstatus))
5400 5401
		return true;
	return false;
5402
}
E
Edward Falk 已提交
5403

T
Tejun Heo 已提交
5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455
/**
 *	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));
}

5456
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5457 5458 5459
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5460 5461 5462 5463
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5464 5465
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5466
		struct ata_link *link;
5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485

		/* 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
5486
		ata_for_each_link(link, ap, HOST_FIRST) {
5487 5488 5489
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507

		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
5508 5509
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5510 5511
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5512
 *	Suspend @host.  Actual operation is performed by EH.  This
5513 5514 5515 5516 5517 5518 5519 5520 5521
 *	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
5522
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5523
{
5524
	int rc;
5525

5526 5527 5528 5529 5530 5531
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5532
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5533 5534
	if (rc == 0)
		host->dev->power.power_state = mesg;
5535 5536 5537 5538
	return rc;
}

/**
J
Jeff Garzik 已提交
5539 5540
 *	ata_host_resume - resume host
 *	@host: host to resume
5541
 *
J
Jeff Garzik 已提交
5542
 *	Resume @host.  Actual operation is performed by EH.  This
5543 5544 5545 5546 5547 5548
 *	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
5549
void ata_host_resume(struct ata_host *host)
5550
{
T
Tejun Heo 已提交
5551
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5552
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5553
	host->dev->power.power_state = PMSG_ON;
5554 5555 5556

	/* reenable link pm */
	ata_lpm_disable(host);
5557
}
5558
#endif
5559

5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571
/**
 *	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.
 */
5572
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5573
{
5574
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5575

5576 5577
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5578 5579 5580 5581 5582 5583
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594
/**
 *	ata_dev_init - Initialize an ata_device structure
 *	@dev: Device structure to initialize
 *
 *	Initialize @dev in preparation for probing.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
void ata_dev_init(struct ata_device *dev)
{
T
Tejun Heo 已提交
5595
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5596
	struct ata_port *ap = link->ap;
5597 5598
	unsigned long flags;

T
Tejun Heo 已提交
5599
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5600 5601
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5602

5603 5604
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5605
	 * host lock.
5606
	 */
5607
	spin_lock_irqsave(ap->lock, flags);
5608
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5609
	dev->horkage = 0;
5610
	spin_unlock_irqrestore(ap->lock, flags);
5611

5612 5613
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5614 5615 5616 5617 5618
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5619 5620 5621 5622
/**
 *	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
5623
 *	@pmp: Port multiplier port number
5624 5625 5626 5627 5628 5629
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5630
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5631 5632 5633 5634 5635 5636 5637
{
	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
5638
	link->pmp = pmp;
5639 5640 5641 5642 5643 5644 5645 5646 5647
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

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

		dev->link = link;
		dev->devno = dev - link->device;
T
Tejun Heo 已提交
5648 5649 5650
#ifdef CONFIG_ATA_ACPI
		dev->gtf_filter = ata_acpi_gtf_filter;
#endif
5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667
		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.
 */
5668
int sata_link_init_spd(struct ata_link *link)
5669
{
5670
	u8 spd;
5671 5672
	int rc;

T
Tejun Heo 已提交
5673
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5674 5675 5676
	if (rc)
		return rc;

T
Tejun Heo 已提交
5677
	spd = (link->saved_scontrol >> 4) & 0xf;
5678 5679 5680
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5681
	ata_force_link_limits(link);
5682

5683 5684 5685 5686 5687
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5688
/**
5689 5690
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5691
 *
5692 5693 5694 5695
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5696
 *
L
Linus Torvalds 已提交
5697
 *	LOCKING:
5698
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5699
 */
5700
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5701
{
5702
	struct ata_port *ap;
L
Linus Torvalds 已提交
5703

5704 5705 5706 5707 5708 5709
	DPRINTK("ENTER\n");

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

5710
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5711
	ap->lock = &host->lock;
5712
	ap->flags = ATA_FLAG_DISABLED;
5713
	ap->print_id = -1;
L
Linus Torvalds 已提交
5714
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5715
	ap->host = host;
5716
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5717
	ap->last_ctl = 0xFF;
5718 5719 5720 5721 5722 5723

#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
5724
#else
5725
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5726
#endif
L
Linus Torvalds 已提交
5727

T
Tejun Heo 已提交
5728
#ifdef CONFIG_ATA_SFF
5729
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5730 5731
#else
	INIT_DELAYED_WORK(&ap->port_task, NULL);
T
Tejun Heo 已提交
5732
#endif
5733 5734
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5735
	INIT_LIST_HEAD(&ap->eh_done_q);
5736
	init_waitqueue_head(&ap->eh_wait_q);
5737
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5738 5739 5740
	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
5741

5742 5743
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5744
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5745 5746 5747 5748 5749 5750 5751 5752

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

5753 5754 5755 5756 5757
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5758 5759 5760
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5761 5762 5763 5764
		if (!ap)
			continue;

		if (ap->scsi_host)
5765 5766
			scsi_host_put(ap->scsi_host);

5767
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5768
		kfree(ap->slave_link);
5769
		kfree(ap);
5770 5771 5772
		host->ports[i] = NULL;
	}

5773
	dev_set_drvdata(gendev, NULL);
5774 5775
}

5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840
/**
 *	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;
}

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 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878
/**
 *	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;
5879
		ap->link.flags |= pi->link_flags;
5880 5881 5882 5883 5884 5885 5886 5887 5888
		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
5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 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 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950
/**
 *	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;
}

5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968
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);
}

5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990
/**
 *	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)
{
5991
	static DEFINE_SPINLOCK(lock);
5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018
	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);
}

6019 6020 6021 6022 6023 6024 6025
/**
 *	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
6026 6027
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6028 6029 6030 6031 6032 6033 6034 6035 6036
 *
 *	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)
{
6037 6038
	int have_stop = 0;
	void *start_dr = NULL;
6039 6040 6041 6042 6043
	int i, rc;

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

6044 6045
	ata_finalize_port_ops(host->ops);

6046 6047 6048
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6049 6050
		ata_finalize_port_ops(ap->ops);

6051 6052 6053
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069
		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];

6070 6071 6072
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
6073
				if (rc != -ENODEV)
A
Andrew Morton 已提交
6074 6075 6076
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
6077 6078 6079 6080 6081 6082
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

6083 6084
	if (start_dr)
		devres_add(host->dev, start_dr);
6085 6086 6087 6088 6089 6090 6091 6092 6093 6094
	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);
	}
6095
	devres_free(start_dr);
6096 6097 6098
	return rc;
}

6099
/**
J
Jeff Garzik 已提交
6100 6101 6102 6103 6104
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6105 6106 6107 6108 6109
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6110
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6111
void ata_host_init(struct ata_host *host, struct device *dev,
6112
		   unsigned long flags, struct ata_port_operations *ops)
6113
{
J
Jeff Garzik 已提交
6114 6115 6116 6117
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6118 6119
}

6120 6121 6122 6123 6124

static void async_port_probe(void *data, async_cookie_t cookie)
{
	int rc;
	struct ata_port *ap = data;
6125 6126 6127 6128 6129

	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
6130 6131
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
6132
	 */
6133
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6134 6135
		async_synchronize_cookie(cookie);

6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171
	/* 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.
			 */
		}
	}
6172 6173 6174 6175 6176 6177

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

	ata_scsi_scan_host(ap, 1);

6178
}
6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221
/**
 *	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;

6222 6223 6224
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6225 6226 6227 6228 6229 6230 6231 6232 6233 6234
	/* 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 */
6235
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6236 6237
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6238

6239
		/* print per-port info to dmesg */
6240 6241 6242
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6243
		if (!ata_port_is_dummy(ap)) {
6244 6245
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6246
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6247
					ata_mode_string(xfer_mask),
6248
					ap->link.eh_info.desc);
6249 6250
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6251 6252 6253
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

V
Vegard Nossum 已提交
6254
	/* perform each probe asynchronously */
6255 6256
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6257
		async_schedule(async_port_probe, ap);
6258 6259 6260 6261 6262
	}

	return 0;
}

6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275
/**
 *	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.
 *
6276 6277 6278 6279
 *	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.
 *
6280 6281 6282 6283 6284 6285 6286 6287 6288 6289
 *	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)
{
6290
	int i, rc;
6291 6292 6293 6294 6295

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

6296 6297 6298 6299 6300 6301
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6302 6303 6304 6305 6306
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6307 6308
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6309

6310 6311 6312 6313 6314 6315 6316 6317
	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;
}

6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328
/**
 *	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).
 */
6329
static void ata_port_detach(struct ata_port *ap)
6330 6331 6332 6333
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6334
		goto skip_eh;
6335 6336

	/* tell EH we're leaving & flush EH */
6337
	spin_lock_irqsave(ap->lock, flags);
6338
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6339
	ata_port_schedule_eh(ap);
6340
	spin_unlock_irqrestore(ap->lock, flags);
6341

T
Tejun Heo 已提交
6342
	/* wait till EH commits suicide */
6343 6344
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6345 6346
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6347

6348
	cancel_rearming_delayed_work(&ap->hotplug_task);
6349

6350
 skip_eh:
6351
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6352
	scsi_remove_host(ap->scsi_host);
6353 6354
}

T
Tejun Heo 已提交
6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369
/**
 *	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]);
6370 6371 6372

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6373 6374
}

6375 6376
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6377 6378 6379 6380
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6381 6382 6383
 *	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
6384 6385 6386 6387
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6388
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6389
{
6390
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6391
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6392

T
Tejun Heo 已提交
6393
	ata_host_detach(host);
L
Linus Torvalds 已提交
6394 6395 6396
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6397
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428
{
	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
6429

6430
#ifdef CONFIG_PM
6431
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6432 6433
{
	pci_save_state(pdev);
6434
	pci_disable_device(pdev);
6435

6436
	if (mesg.event & PM_EVENT_SLEEP)
6437
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6438 6439
}

6440
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6441
{
6442 6443
	int rc;

J
Jens Axboe 已提交
6444 6445
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6446

T
Tejun Heo 已提交
6447
	rc = pcim_enable_device(pdev);
6448 6449 6450 6451 6452 6453
	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
6454
	pci_set_master(pdev);
6455
	return 0;
6456 6457
}

6458
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6459
{
J
Jeff Garzik 已提交
6460
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6461 6462
	int rc = 0;

J
Jeff Garzik 已提交
6463
	rc = ata_host_suspend(host, mesg);
6464 6465 6466
	if (rc)
		return rc;

6467
	ata_pci_device_do_suspend(pdev, mesg);
6468 6469 6470 6471 6472 6473

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6474
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6475
	int rc;
6476

6477 6478 6479 6480
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6481
}
6482 6483
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6484 6485
#endif /* CONFIG_PCI */

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
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) },
6540 6541 6542
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
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 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662
	};
	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
6663 6664 6665

static int __init ata_init(void)
{
6666 6667
	ata_parse_force_param();

6668 6669 6670 6671 6672 6673 6674
	/*
	 * FIXME: In UP case, there is only one workqueue thread and if you
	 * have more than one PIO device, latency is bloody awful, with
	 * occasional multi-second "hiccups" as one PIO device waits for
	 * another.  It's an ugly wart that users DO occasionally complain
	 * about; luckily most users have at most one PIO polled device.
	 */
L
Linus Torvalds 已提交
6675 6676
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
6677
		goto free_force_tbl;
L
Linus Torvalds 已提交
6678

6679
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
6680 6681
	if (!ata_aux_wq)
		goto free_wq;
6682

L
Linus Torvalds 已提交
6683 6684
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6685 6686 6687 6688 6689 6690

free_wq:
	destroy_workqueue(ata_wq);
free_force_tbl:
	kfree(ata_force_tbl);
	return -ENOMEM;
L
Linus Torvalds 已提交
6691 6692 6693 6694
}

static void __exit ata_exit(void)
{
6695
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6696
	destroy_workqueue(ata_wq);
6697
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6698 6699
}

6700
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6701 6702
module_exit(ata_exit);

6703
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6704
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723

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;
}

6724 6725 6726 6727 6728
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6729 6730
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747
 *
 *	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,
6748
		      unsigned long interval, unsigned long timeout)
6749
{
6750
	unsigned long deadline;
6751 6752 6753 6754 6755 6756 6757 6758
	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.
	 */
6759
	deadline = ata_deadline(jiffies, timeout);
6760

6761 6762
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
		msleep(interval);
6763 6764 6765 6766 6767 6768
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6769 6770 6771
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6772
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6773
{
T
Tejun Heo 已提交
6774
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6775 6776
}

T
Tejun Heo 已提交
6777
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6778
{
T
Tejun Heo 已提交
6779
	/* truly dummy */
T
Tejun Heo 已提交
6780 6781
}

6782
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6783 6784
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6785
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6786 6787
};

6788 6789 6790 6791
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6792 6793 6794 6795 6796 6797
/*
 * 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.
 */
6798 6799 6800
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6801 6802
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6803
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6804
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6805 6806
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6807
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6808
EXPORT_SYMBOL_GPL(ata_host_init);
6809
EXPORT_SYMBOL_GPL(ata_host_alloc);
6810
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6811
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6812
EXPORT_SYMBOL_GPL(ata_host_start);
6813
EXPORT_SYMBOL_GPL(ata_host_register);
6814
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6815
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6816
EXPORT_SYMBOL_GPL(ata_sg_init);
6817
EXPORT_SYMBOL_GPL(ata_qc_complete);
6818
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6819
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6820 6821
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6822 6823 6824 6825 6826 6827 6828
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
6829
EXPORT_SYMBOL_GPL(ata_port_start);
6830
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6831
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6832
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6833
EXPORT_SYMBOL_GPL(ata_port_probe);
6834
EXPORT_SYMBOL_GPL(ata_dev_disable);
6835
EXPORT_SYMBOL_GPL(sata_set_spd);
6836
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6837 6838
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6839
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6840
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6841
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6842
EXPORT_SYMBOL_GPL(ata_std_postreset);
6843 6844
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6845
EXPORT_SYMBOL_GPL(ata_port_disable);
6846
EXPORT_SYMBOL_GPL(ata_ratelimit);
6847
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6848 6849
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6850
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6851
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6852 6853 6854 6855
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);
6856 6857
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6858
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6859 6860
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6861
#endif /* CONFIG_PM */
6862 6863
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6864
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6865 6866
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6867
EXPORT_SYMBOL_GPL(ata_pio_queue_task);
6868
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6869
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6870 6871
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6872
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6873

L
Linus Torvalds 已提交
6874 6875 6876
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6877
#ifdef CONFIG_PM
6878 6879
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6880 6881
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6882
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6883
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6884

T
Tejun Heo 已提交
6885 6886 6887
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6888 6889 6890 6891
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6892
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6893
EXPORT_SYMBOL_GPL(ata_link_abort);
6894
EXPORT_SYMBOL_GPL(ata_port_abort);
6895
EXPORT_SYMBOL_GPL(ata_port_freeze);
6896
EXPORT_SYMBOL_GPL(sata_async_notification);
6897 6898
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6899 6900
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6901
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6902
EXPORT_SYMBOL_GPL(ata_do_eh);
6903
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6904 6905 6906 6907

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6908
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6909
EXPORT_SYMBOL_GPL(ata_cable_sata);