libata-core.c 174.4 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

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

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

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

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

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

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struct workqueue_struct *ata_aux_wq;

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

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

static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;

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

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

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

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

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int libata_noacpi = 0;
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module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
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MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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

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

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

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

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	return NULL;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	case GPCMD_READ_CD:
	case GPCMD_READ_CD_MSF:
		return ATAPI_READ_CD;

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

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

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

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

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

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

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

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

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

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

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

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

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static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
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	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
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	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
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	0,
	0,
	0,
	0,
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	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
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	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
632
};
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/**
635
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
636 637
 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
639
 *	Examine the device configuration and tf->flags to calculate
640
 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
645
static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
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{
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	u8 cmd;
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	int index, fua, lba48, write;
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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
661
		index = dev->multi_count ? 0 : 8;
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	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
665
	}
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	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
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}

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

	if (tf->flags & ATA_TFLAG_LBA) {
		if (tf->flags & ATA_TFLAG_LBA48) {
			block |= (u64)tf->hob_lbah << 40;
			block |= (u64)tf->hob_lbam << 32;
698
			block |= (u64)tf->hob_lbal << 24;
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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;
719 720 721 722 723
	}

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
862 863 864
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
865 866 867 868 869 870
{
	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}

871 872 873 874 875 876 877 878 879 880
/**
 *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 *	@xfer_mask: xfer_mask to unpack
 *	@pio_mask: resulting pio_mask
 *	@mwdma_mask: resulting mwdma_mask
 *	@udma_mask: resulting udma_mask
 *
 *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 *	Any NULL distination masks will be ignored.
 */
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void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
883 884 885 886 887 888 889 890 891
{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

892
static const struct ata_xfer_ent {
893
	int shift, bits;
894 895
	u8 base;
} ata_xfer_tbl[] = {
896 897 898
	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
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	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
913
 *	Matching XFER_* value, 0xff if no match found.
914
 */
915
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
916 917 918 919 920 921 922
{
	int highbit = fls(xfer_mask) - 1;
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
			return ent->base + highbit - ent->shift;
923
	return 0xff;
924 925 926 927 928 929 930 931 932 933 934 935 936 937
}

/**
 *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_mask for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mask, 0 if no match found.
 */
938
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
939 940 941 942 943
{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
944 945
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
	return 0;
}

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
961
int ata_xfer_mode2shift(unsigned long xfer_mode)
962 963 964 965 966 967 968 969 970
{
	const struct ata_xfer_ent *ent;

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

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/**
972 973
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
976
 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
983
 *	@mode_mask, or the constant C string "<n/a>".
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 */
985
const char *ata_mode_string(unsigned long xfer_mask)
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{
987 988 989 990 991 992
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
993 994
		"PIO5",
		"PIO6",
995 996 997
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
998 999
		"MWDMA3",
		"MWDMA4",
1000 1001 1002 1003 1004 1005 1006 1007 1008
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
1009
	int highbit;
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1011 1012 1013
	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>";
}

1017 1018 1019 1020 1021
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1022
		"6.0 Gbps",
1023 1024 1025 1026 1027 1028 1029
	};

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

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
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;

1086 1087 1088 1089 1090
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
1091 1092 1093 1094 1095 1096 1097 1098 1099
		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;

1100 1101 1102 1103 1104
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
		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
1118 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
 *
 *	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
1148 1149
/**
 *	ata_dev_disable_pm - disable SATA interface power management
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 *	@dev: device to disable power management
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
 *
 *	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 */
1169 1170 1171 1172

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1173
	ap->link.eh_info.action |= ATA_EH_LPM;
1174 1175 1176 1177
	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
1179 1180 1181 1182 1183 1184 1185 1186 1187
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];
T
Tejun Heo 已提交
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		ata_for_each_link(link, ap, EDGE) {
			ata_for_each_dev(dev, link, ALL)
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
				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 */
1205

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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:
1218 1219
 *	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
1222 1223 1224 1225
{
	/* 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.
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
	 *
	 * 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
1243
	 */
1244
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
Linus Torvalds 已提交
1245 1246 1247 1248
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1249
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
L
Linus Torvalds 已提交
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1254 1255 1256 1257 1258 1259
	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;
1262 1263
	}

L
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1264 1265 1266 1267 1268
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
1269
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
Linus Torvalds 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
 *	@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.
 */

1283 1284
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
L
Linus Torvalds 已提交
1285 1286 1287
{
	unsigned int c;

1288 1289
	BUG_ON(len & 1);

L
Linus Torvalds 已提交
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

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

		ofs++;
		len -= 2;
	}
}

1304
/**
1305
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1306 1307 1308 1309 1310
 *	@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.
 *
1311
 *	This function is identical to ata_id_string except that it
1312 1313 1314 1315 1316 1317
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1318 1319
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1320 1321 1322
{
	unsigned char *p;

1323
	ata_id_string(id, s, ofs, len - 1);
1324 1325 1326 1327 1328 1329

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
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T
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1331 1332 1333 1334
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1335
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
T
Tejun Heo 已提交
1336
		else
1337
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
T
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1338 1339
	} else {
		if (ata_id_current_chs_valid(id))
1340 1341
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
T
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1342
		else
1343 1344
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
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Tejun Heo 已提交
1345 1346 1347
	}
}

1348
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1349 1350 1351 1352 1353
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1354
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
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1355 1356 1357 1358
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1359
	return sectors;
A
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1360 1361
}

1362
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
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1363 1364 1365 1366 1367 1368 1369 1370
{
	u64 sectors = 0;

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

1371
	return sectors;
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1372 1373 1374
}

/**
1375 1376 1377
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
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1378
 *
1379 1380
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
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 *
1382 1383 1384
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
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1385
 */
1386
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1387
{
1388
	unsigned int err_mask;
A
Alan Cox 已提交
1389
	struct ata_taskfile tf;
1390
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1391 1392 1393

	ata_tf_init(dev, &tf);

1394
	/* always clear all address registers */
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1395 1396
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1397 1398 1399 1400 1401
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
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1402 1403

	tf.protocol |= ATA_PROT_NODATA;
1404 1405
	tf.device |= ATA_LBA;

1406
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1407 1408 1409 1410 1411 1412 1413
	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
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1414

1415
	if (lba48)
1416
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1417
	else
1418
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1419
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1420
		(*max_sectors)--;
1421
	return 0;
A
Alan Cox 已提交
1422 1423 1424
}

/**
1425 1426
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1427
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
1428
 *
1429 1430 1431 1432 1433 1434
 *	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
1435
 */
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Tejun Heo 已提交
1436
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1437
{
1438
	unsigned int err_mask;
A
Alan Cox 已提交
1439
	struct ata_taskfile tf;
1440
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1441 1442 1443 1444 1445 1446

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1447 1448 1449 1450 1451 1452 1453 1454

	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
1455
	} else {
1456 1457
		tf.command = ATA_CMD_SET_MAX;

T
Tejun Heo 已提交
1458 1459 1460
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1461
	tf.protocol |= ATA_PROT_NODATA;
1462
	tf.device |= ATA_LBA;
A
Alan Cox 已提交
1463 1464 1465 1466 1467

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

1468
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1469 1470 1471 1472 1473 1474 1475 1476 1477 1478
	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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1479 1480 1481 1482 1483 1484 1485 1486 1487
}

/**
 *	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
1488 1489 1490
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
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1491
 */
T
Tejun Heo 已提交
1492
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1493
{
T
Tejun Heo 已提交
1494 1495 1496 1497
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1498
	int rc;
J
Jeff Garzik 已提交
1499

T
Tejun Heo 已提交
1500 1501 1502 1503
	/* 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))
1504
		return 0;
A
Alan Cox 已提交
1505

T
Tejun Heo 已提交
1506 1507 1508
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
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1509 1510
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1511
		 */
T
Tejun Heo 已提交
1512
		if (rc == -EACCES || !ata_ignore_hpa) {
T
Tejun Heo 已提交
1513
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1514
				       "broken, skipping HPA handling\n");
T
Tejun Heo 已提交
1515 1516 1517 1518 1519
			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
1520
		}
T
Tejun Heo 已提交
1521

T
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1522 1523
		return rc;
	}
T
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1524
	dev->n_native_sectors = native_sectors;
T
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1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575

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

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

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

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

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

	return 0;
A
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1576 1577
}

L
Linus Torvalds 已提交
1578 1579
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1580
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1581
 *
1582 1583
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1584 1585 1586 1587 1588
 *
 *	LOCKING:
 *	caller.
 */

1589
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1596 1597 1598 1599 1600
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1601 1602 1603 1604 1605
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1606 1607 1608 1609 1610
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1611 1612
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1613 1614
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1615 1616
}

1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
/**
 *	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
 */
1632
unsigned long ata_id_xfermask(const u16 *id)
1633
{
1634
	unsigned long pio_mask, mwdma_mask, udma_mask;
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645

	/* 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.
		 */
1646
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1647
		if (mode < 5)	/* Valid PIO range */
1648
			pio_mask = (2 << mode) - 1;
1649 1650
		else
			pio_mask = 1;
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660

		/* 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;
1661

1662 1663 1664 1665
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
S
Sergei Shtylyov 已提交
1666 1667
		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678

		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);
	}

1679 1680 1681
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1682 1683 1684 1685

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1686
/**
1687
 *	ata_pio_queue_task - Queue port_task
T
Tejun Heo 已提交
1688
 *	@ap: The ata_port to queue port_task for
1689
 *	@data: data for @fn to use
1690
 *	@delay: delay time in msecs for workqueue function
T
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1691 1692 1693 1694 1695 1696 1697
 *
 *	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
1698
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
T
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1699 1700 1701 1702 1703
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
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1704
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1705
{
1706
	ap->port_task_data = data;
T
Tejun Heo 已提交
1707

1708
	/* may fail if ata_port_flush_task() in progress */
1709
	queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
T
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1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
}

/**
 *	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");

1726
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1727

1728
	if (ata_msg_ctl(ap))
1729
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
T
Tejun Heo 已提交
1730 1731
}

1732
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1733
{
1734
	struct completion *waiting = qc->private_data;
1735 1736 1737 1738 1739

	complete(waiting);
}

/**
1740
 *	ata_exec_internal_sg - execute libata internal command
1741 1742
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1743
 *	@cdb: CDB for packet command
1744
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1745
 *	@sgl: sg list for the data buffer of the command
1746
 *	@n_elem: Number of sg entries
1747
 *	@timeout: Timeout in msecs (0 for default)
1748 1749 1750 1751 1752 1753 1754 1755 1756
 *
 *	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.
1757 1758 1759
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1760
 */
1761 1762
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1763
			      int dma_dir, struct scatterlist *sgl,
1764
			      unsigned int n_elem, unsigned long timeout)
1765
{
T
Tejun Heo 已提交
1766 1767
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1768
	u8 command = tf->command;
1769
	int auto_timeout = 0;
1770
	struct ata_queued_cmd *qc;
1771
	unsigned int tag, preempted_tag;
1772
	u32 preempted_sactive, preempted_qc_active;
1773
	int preempted_nr_active_links;
1774
	DECLARE_COMPLETION_ONSTACK(wait);
1775
	unsigned long flags;
1776
	unsigned int err_mask;
1777
	int rc;
1778

1779
	spin_lock_irqsave(ap->lock, flags);
1780

1781
	/* no internal command while frozen */
1782
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1783
		spin_unlock_irqrestore(ap->lock, flags);
1784 1785 1786
		return AC_ERR_SYSTEM;
	}

1787
	/* initialize internal qc */
1788

1789 1790 1791 1792 1793 1794 1795 1796 1797 1798
	/* 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;

1799 1800
	if (test_and_set_bit(tag, &ap->qc_allocated))
		BUG();
1801
	qc = __ata_qc_from_tag(ap, tag);
1802 1803 1804 1805 1806 1807 1808

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

T
Tejun Heo 已提交
1809 1810
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1811
	preempted_qc_active = ap->qc_active;
1812
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1813 1814
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1815
	ap->qc_active = 0;
1816
	ap->nr_active_links = 0;
1817 1818

	/* prepare & issue qc */
1819
	qc->tf = *tf;
1820 1821
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1822
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1823 1824
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1825
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1826
		struct scatterlist *sg;
1827

J
Jens Axboe 已提交
1828 1829
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1830

J
Jens Axboe 已提交
1831
		ata_sg_init(qc, sgl, n_elem);
1832
		qc->nbytes = buflen;
1833 1834
	}

1835
	qc->private_data = &wait;
1836 1837
	qc->complete_fn = ata_qc_complete_internal;

1838
	ata_qc_issue(qc);
1839

1840
	spin_unlock_irqrestore(ap->lock, flags);
1841

1842 1843 1844 1845 1846 1847 1848 1849
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1850 1851

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1852 1853

	ata_port_flush_task(ap);
1854

1855
	if (!rc) {
1856
		spin_lock_irqsave(ap->lock, flags);
1857 1858 1859

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1860 1861
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1862
		 */
1863
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1864 1865 1866 1867 1868 1869
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1870

1871 1872
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1873
					"qc timeout (cmd 0x%x)\n", command);
1874 1875
		}

1876
		spin_unlock_irqrestore(ap->lock, flags);
1877 1878
	}

1879 1880 1881 1882
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1883 1884 1885 1886 1887 1888 1889 1890 1891 1892
	/* 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;
1893 1894
	}

1895
	/* finish up */
1896
	spin_lock_irqsave(ap->lock, flags);
1897

1898
	*tf = qc->result_tf;
1899 1900 1901
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1902 1903
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1904
	ap->qc_active = preempted_qc_active;
1905
	ap->nr_active_links = preempted_nr_active_links;
1906

1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917
	/* 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.
	 */
1918
	if (ap->flags & ATA_FLAG_DISABLED) {
1919 1920 1921 1922
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1923
	spin_unlock_irqrestore(ap->lock, flags);
1924

1925 1926 1927
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1928
	return err_mask;
1929 1930
}

1931
/**
1932
 *	ata_exec_internal - execute libata internal command
1933 1934 1935 1936 1937 1938
 *	@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
1939
 *	@timeout: Timeout in msecs (0 for default)
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
 *
 *	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,
1952 1953
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1954
{
1955 1956
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1957

1958 1959 1960 1961 1962 1963
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1964

1965 1966
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1967 1968
}

1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
/**
 *	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
1982
 */
1983
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1984 1985 1986 1987 1988 1989 1990 1991 1992
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1993
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1994 1995
}

1996 1997 1998 1999 2000 2001 2002 2003 2004
/**
 *	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
2005 2006 2007 2008 2009 2010 2011 2012 2013
	/* 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
2014
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
2015
		return 0;
2016 2017 2018 2019
	/* 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
2020 2021 2022 2023 2024
	/* 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))
2025
		return 1;
A
Alan Cox 已提交
2026 2027
	return 0;
}
2028

A
Alan Cox 已提交
2029 2030 2031 2032 2033 2034 2035 2036 2037
/**
 *	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)
{
2038 2039
	/* 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
2040
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
2041 2042 2043 2044
		/* 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
2045 2046
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
2047 2048
		}
	}
A
Alan Cox 已提交
2049
	return 3 << ATA_SHIFT_PIO;
2050 2051
}

2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068
/**
 *	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
2069
/**
2070 2071 2072
 *	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)
2073
 *	@flags: ATA_READID_* flags
2074
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
2075
 *
2076 2077
 *	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
2078 2079
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
2080
 *
2081
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
2082
 *	now we abort if we hit that case.
2083
 *
L
Linus Torvalds 已提交
2084
 *	LOCKING:
2085 2086 2087 2088
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2089
 */
2090
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
2091
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
2092
{
T
Tejun Heo 已提交
2093
	struct ata_port *ap = dev->link->ap;
2094
	unsigned int class = *p_class;
2095
	struct ata_taskfile tf;
2096 2097
	unsigned int err_mask = 0;
	const char *reason;
T
Tejun Heo 已提交
2098
	bool is_semb = class == ATA_DEV_SEMB;
2099
	int may_fallback = 1, tried_spinup = 0;
2100
	int rc;
L
Linus Torvalds 已提交
2101

2102
	if (ata_msg_ctl(ap))
2103
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2104

2105
retry:
T
Tejun Heo 已提交
2106
	ata_tf_init(dev, &tf);
2107

2108
	switch (class) {
T
Tejun Heo 已提交
2109 2110
	case ATA_DEV_SEMB:
		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
2111
	case ATA_DEV_ATA:
2112
		tf.command = ATA_CMD_ID_ATA;
2113 2114
		break;
	case ATA_DEV_ATAPI:
2115
		tf.command = ATA_CMD_ID_ATAPI;
2116 2117 2118 2119 2120
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
2121 2122
	}

2123
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
2124 2125 2126 2127 2128 2129 2130 2131 2132 2133

	/* 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
2134

2135 2136 2137 2138 2139
	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);

2140
	if (err_mask) {
2141
		if (err_mask & AC_ERR_NODEV_HINT) {
2142 2143
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
2144 2145 2146
			return -ENOENT;
		}

T
Tejun Heo 已提交
2147 2148 2149 2150 2151 2152 2153 2154
		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;
		}

2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177
		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;
2178 2179
		}

2180 2181
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
2182 2183 2184
		goto err_out;
	}

2185 2186 2187 2188 2189
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

2190
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
2191

2192
	/* sanity check */
2193
	rc = -EINVAL;
A
Alan Cox 已提交
2194
	reason = "device reports invalid type";
2195 2196 2197 2198 2199 2200 2201

	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;
2202 2203
	}

2204 2205 2206 2207 2208 2209 2210
	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.
		 */
2211
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2212
		if (err_mask && id[2] != 0x738c) {
2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224
			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;
	}

2225
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2226 2227 2228
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2229 2230
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2231 2232
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2233 2234 2235
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2236 2237
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2238
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2239 2240 2241 2242 2243 2244 2245 2246 2247
			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.
			 */
2248
			flags &= ~ATA_READID_POSTRESET;
2249 2250 2251 2252 2253
			goto retry;
		}
	}

	*p_class = class;
2254

2255 2256 2257
	return 0;

 err_out:
T
Tejun Heo 已提交
2258
	if (ata_msg_warn(ap))
2259
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2260
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2261 2262 2263
	return rc;
}

2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297
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
2298
static inline u8 ata_dev_knobble(struct ata_device *dev)
2299
{
T
Tejun Heo 已提交
2300
	struct ata_port *ap = dev->link->ap;
2301 2302 2303 2304

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

T
Tejun Heo 已提交
2305
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2306 2307
}

2308
static int ata_dev_config_ncq(struct ata_device *dev,
2309 2310
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2311
	struct ata_port *ap = dev->link->ap;
2312
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2313 2314
	unsigned int err_mask;
	char *aa_desc = "";
2315 2316 2317

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2318
		return 0;
2319
	}
T
Tejun Heo 已提交
2320
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2321
		snprintf(desc, desc_sz, "NCQ (not used)");
2322
		return 0;
2323
	}
2324
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2325
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2326 2327 2328
		dev->flags |= ATA_DFLAG_NCQ;
	}

2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344
	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";
	}

2345
	if (hdepth >= ddepth)
2346
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2347
	else
2348 2349 2350
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
	return 0;
2351 2352
}

2353
/**
2354 2355 2356 2357 2358
 *	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.
2359 2360
 *
 *	LOCKING:
2361 2362 2363 2364
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2365
 */
2366
int ata_dev_configure(struct ata_device *dev)
2367
{
T
Tejun Heo 已提交
2368 2369
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2370
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2371
	const u16 *id = dev->id;
2372
	unsigned long xfer_mask;
2373
	char revbuf[7];		/* XYZ-99\0 */
2374 2375
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2376
	int rc;
2377

2378
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2379
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2380
			       __func__);
2381
		return 0;
2382 2383
	}

2384
	if (ata_msg_probe(ap))
2385
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2386

T
Tejun Heo 已提交
2387 2388
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2389
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2390

2391 2392 2393 2394 2395 2396 2397
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2398 2399 2400 2401 2402 2403 2404 2405 2406 2407
	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;
	}

2408 2409 2410 2411
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2412 2413 2414 2415
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2416

T
Tejun Heo 已提交
2417 2418 2419 2420 2421
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2422
	/* print device capabilities */
2423
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2424 2425 2426
		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",
2427
			       __func__,
2428 2429
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2430

2431
	/* initialize to-be-configured parameters */
2432
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2433 2434 2435 2436 2437 2438
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2439
	dev->multi_count = 0;
2440

L
Linus Torvalds 已提交
2441 2442 2443 2444
	/*
	 * common ATA, ATAPI feature tests
	 */

2445
	/* find max transfer mode; for printk only */
2446
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2447

2448 2449
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2450

2451 2452 2453 2454 2455 2456 2457
	/* 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
2458 2459
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2460
		if (ata_id_is_cfa(id)) {
S
Sergei Shtylyov 已提交
2461 2462
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
T
Tejun Heo 已提交
2463 2464 2465
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2466
			snprintf(revbuf, 7, "CFA");
2467
		} else {
2468
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2469 2470 2471 2472 2473 2474
			/* 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");
		}
2475

2476
		dev->n_sectors = ata_id_n_sectors(id);
2477

2478 2479 2480 2481 2482 2483 2484 2485 2486
		/* 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;
		}
2487

2488
		if (ata_id_has_lba(id)) {
2489
			const char *lba_desc;
2490
			char ncq_desc[24];
2491

2492 2493
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2494
			if (ata_id_has_lba48(id)) {
2495
				dev->flags |= ATA_DFLAG_LBA48;
2496
				lba_desc = "LBA48";
2497 2498 2499 2500

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2501
			}
2502

2503
			/* config NCQ */
2504 2505 2506
			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
			if (rc)
				return rc;
2507

2508
			/* print device info to dmesg */
2509 2510 2511 2512 2513 2514 2515
			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",
2516
					(unsigned long long)dev->n_sectors,
2517 2518
					dev->multi_count, lba_desc, ncq_desc);
			}
2519
		} else {
2520 2521 2522
			/* CHS */

			/* Default translation */
2523 2524 2525
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2526

2527
			if (ata_id_current_chs_valid(id)) {
2528
				/* Current CHS translation is valid. */
2529 2530 2531
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2532 2533 2534
			}

			/* print device info to dmesg */
2535
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2536
				ata_dev_printk(dev, KERN_INFO,
2537 2538 2539
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2540
				ata_dev_printk(dev, KERN_INFO,
2541 2542 2543 2544 2545
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2546 2547
		}

2548
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2549 2550 2551
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2552
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2553 2554
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2555
		const char *dma_dir_string = "";
2556
		u32 sntf;
2557

2558
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2559
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2560
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2561 2562
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2563
			rc = -EINVAL;
L
Linus Torvalds 已提交
2564 2565
			goto err_out_nosup;
		}
2566
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2567

2568 2569 2570 2571
		/* 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.
2572
		 */
2573
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2574
		    (!sata_pmp_attached(ap) ||
2575
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2576 2577
			unsigned int err_mask;

2578
			/* issue SET feature command to turn this on */
2579 2580
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2581
			if (err_mask)
2582
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2583 2584 2585
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2586
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2587 2588
				atapi_an_string = ", ATAPI AN";
			}
2589 2590
		}

2591
		if (ata_id_cdb_intr(dev->id)) {
2592
			dev->flags |= ATA_DFLAG_CDB_INTR;
2593 2594
			cdb_intr_string = ", CDB intr";
		}
2595

2596 2597 2598 2599 2600
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2601
		/* print device info to dmesg */
2602
		if (ata_msg_drv(ap) && print_info)
2603
			ata_dev_printk(dev, KERN_INFO,
2604
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2605
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2606
				       ata_mode_string(xfer_mask),
2607 2608
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2609 2610
	}

2611 2612 2613 2614 2615
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2616 2617 2618 2619 2620 2621 2622
	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;
	}

2623 2624
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2625
	if (ata_dev_knobble(dev)) {
2626
		if (ata_msg_drv(ap) && print_info)
2627 2628
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2629
		dev->udma_mask &= ATA_UDMA5;
2630 2631 2632
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2633
	if ((dev->class == ATA_DEV_ATAPI) &&
2634
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2635
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2636 2637
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2638

T
Tejun Heo 已提交
2639
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2640 2641
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2642

2643 2644 2645 2646 2647 2648 2649
	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;
	}

2650
	if (ap->ops->dev_config)
2651
		ap->ops->dev_config(dev);
2652

2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
	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");
		}
	}

2668 2669 2670 2671 2672 2673 2674
	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");
	}

2675
	return 0;
L
Linus Torvalds 已提交
2676 2677

err_out_nosup:
2678
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2679
		ata_dev_printk(dev, KERN_DEBUG,
2680
			       "%s: EXIT, err\n", __func__);
2681
	return rc;
L
Linus Torvalds 已提交
2682 2683
}

A
Alan Cox 已提交
2684
/**
2685
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2686 2687
 *	@ap: port
 *
2688
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2689 2690 2691 2692 2693 2694 2695 2696 2697
 *	detection.
 */

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

/**
2698
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2699 2700
 *	@ap: port
 *
2701
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721
 *	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
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733
/**
 *	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
2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745
/**
 *	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
2746 2747 2748 2749
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2750 2751 2752 2753
 *	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
2754
 *	LOCKING:
J
Jeff Garzik 已提交
2755
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2756 2757
 *
 *	RETURNS:
2758
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2759 2760
 */

2761
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2762
{
2763
	unsigned int classes[ATA_MAX_DEVICES];
2764
	int tries[ATA_MAX_DEVICES];
2765
	int rc;
2766
	struct ata_device *dev;
L
Linus Torvalds 已提交
2767

2768
	ata_port_probe(ap);
2769

T
Tejun Heo 已提交
2770
	ata_for_each_dev(dev, &ap->link, ALL)
2771
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2772 2773

 retry:
T
Tejun Heo 已提交
2774
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792
		/* 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);
	}

2793
	/* reset and determine device classes */
2794
	ap->ops->phy_reset(ap);
2795

T
Tejun Heo 已提交
2796
	ata_for_each_dev(dev, &ap->link, ALL) {
2797 2798 2799 2800 2801
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2802

2803
		dev->class = ATA_DEV_UNKNOWN;
2804
	}
L
Linus Torvalds 已提交
2805

2806
	ata_port_probe(ap);
2807

2808 2809 2810 2811
	/* 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
2812
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2813 2814
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2815

2816
		if (!ata_dev_enabled(dev))
2817 2818
			continue;

2819 2820
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2821 2822
		if (rc)
			goto fail;
2823 2824
	}

A
Alan Cox 已提交
2825 2826 2827 2828
	/* 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
2829 2830 2831 2832 2833 2834
	/* 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
2835 2836 2837
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2838 2839 2840
	/* 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
2841
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2842
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2843
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2844
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2845 2846
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2847 2848
	}

2849
	/* configure transfer mode */
2850
	rc = ata_set_mode(&ap->link, &dev);
2851
	if (rc)
2852
		goto fail;
L
Linus Torvalds 已提交
2853

T
Tejun Heo 已提交
2854 2855
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2856

2857 2858
	/* no device present, disable port */
	ata_port_disable(ap);
2859
	return -ENODEV;
2860 2861

 fail:
2862 2863
	tries[dev->devno]--;

2864 2865
	switch (rc) {
	case -EINVAL:
2866
		/* eeek, something went very wrong, give up */
2867 2868
		tries[dev->devno] = 0;
		break;
2869 2870 2871 2872

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2873
	case -EIO:
2874 2875 2876 2877
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2878
			sata_down_spd_limit(&ap->link, 0);
2879 2880
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2881 2882
	}

2883
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2884
		ata_dev_disable(dev);
2885

2886
	goto retry;
L
Linus Torvalds 已提交
2887 2888 2889
}

/**
J
Jeff Garzik 已提交
2890 2891
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2892
 *
J
Jeff Garzik 已提交
2893 2894 2895
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2896
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2897
 *	serialization.
L
Linus Torvalds 已提交
2898 2899 2900 2901
 */

void ata_port_probe(struct ata_port *ap)
{
2902
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2903 2904
}

2905 2906
/**
 *	sata_print_link_status - Print SATA link status
2907
 *	@link: SATA link to printk link status about
2908 2909 2910 2911 2912 2913
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2914
static void sata_print_link_status(struct ata_link *link)
2915
{
2916
	u32 sstatus, scontrol, tmp;
2917

2918
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2919
		return;
2920
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2921

T
Tejun Heo 已提交
2922
	if (ata_phys_link_online(link)) {
2923
		tmp = (sstatus >> 4) & 0xf;
2924
		ata_link_printk(link, KERN_INFO,
2925 2926
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2927
	} else {
2928
		ata_link_printk(link, KERN_INFO,
2929 2930
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2931 2932 2933
	}
}

2934 2935 2936 2937 2938 2939 2940
/**
 *	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
 */
2941

T
Tejun Heo 已提交
2942
struct ata_device *ata_dev_pair(struct ata_device *adev)
2943
{
T
Tejun Heo 已提交
2944 2945
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2946
	if (!ata_dev_enabled(pair))
2947 2948 2949 2950
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2951
/**
J
Jeff Garzik 已提交
2952 2953
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2954
 *
J
Jeff Garzik 已提交
2955 2956 2957 2958 2959
 *	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
2960
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2961
 *	serialization.
L
Linus Torvalds 已提交
2962 2963 2964 2965
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2966 2967
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2968
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2969 2970
}

2971
/**
2972
 *	sata_down_spd_limit - adjust SATA spd limit downward
2973
 *	@link: Link to adjust SATA spd limit for
2974
 *	@spd_limit: Additional limit
2975
 *
2976
 *	Adjust SATA spd limit of @link downward.  Note that this
2977
 *	function only adjusts the limit.  The change must be applied
2978
 *	using sata_set_spd().
2979
 *
2980 2981 2982 2983 2984
 *	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.
 *
2985 2986 2987 2988 2989 2990
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2991
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2992
{
2993
	u32 sstatus, spd, mask;
2994
	int rc, bit;
2995

2996
	if (!sata_scr_valid(link))
2997 2998 2999
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
3000
	 * If not, use cached value in link->sata_spd.
3001
	 */
3002
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3003
	if (rc == 0 && ata_sstatus_online(sstatus))
3004 3005
		spd = (sstatus >> 4) & 0xf;
	else
3006
		spd = link->sata_spd;
3007

3008
	mask = link->sata_spd_limit;
3009 3010
	if (mask <= 1)
		return -EINVAL;
3011 3012

	/* unconditionally mask off the highest bit */
3013 3014
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
3015

3016 3017 3018 3019 3020 3021 3022 3023 3024
	/* 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? */
3025 3026 3027
	if (!mask)
		return -EINVAL;

3028 3029 3030 3031 3032 3033 3034 3035 3036
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

3037
	link->sata_spd_limit = mask;
3038

3039
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
3040
			sata_spd_string(fls(mask)));
3041 3042 3043 3044

	return 0;
}

3045
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3046
{
3047 3048
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
3049

3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060
	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;
3061
	else
3062
		target = fls(limit);
3063 3064

	spd = (*scontrol >> 4) & 0xf;
3065
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3066

3067
	return spd != target;
3068 3069 3070
}

/**
3071
 *	sata_set_spd_needed - is SATA spd configuration needed
3072
 *	@link: Link in question
3073 3074
 *
 *	Test whether the spd limit in SControl matches
3075
 *	@link->sata_spd_limit.  This function is used to determine
3076 3077 3078 3079 3080 3081 3082 3083 3084
 *	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
3085
static int sata_set_spd_needed(struct ata_link *link)
3086 3087 3088
{
	u32 scontrol;

3089
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3090
		return 1;
3091

3092
	return __sata_set_spd_needed(link, &scontrol);
3093 3094 3095
}

/**
3096
 *	sata_set_spd - set SATA spd according to spd limit
3097
 *	@link: Link to set SATA spd for
3098
 *
3099
 *	Set SATA spd of @link according to sata_spd_limit.
3100 3101 3102 3103 3104 3105
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
3106
 *	changed.  Negative errno if SCR registers are inaccessible.
3107
 */
3108
int sata_set_spd(struct ata_link *link)
3109 3110
{
	u32 scontrol;
3111
	int rc;
3112

3113
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3114
		return rc;
3115

3116
	if (!__sata_set_spd_needed(link, &scontrol))
3117 3118
		return 0;

3119
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3120 3121
		return rc;

3122 3123 3124
	return 1;
}

A
Alan Cox 已提交
3125 3126 3127 3128 3129
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
3130
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
3131
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3132 3133 3134
 * 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
3135 3136 3137
 */

static const struct ata_timing ata_timing[] = {
3138 3139 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
/*	{ 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
3165 3166 3167 3168

	{ 0xFF }
};

3169 3170
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
3171 3172 3173

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
3174 3175 3176 3177 3178 3179 3180 3181 3182
	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
3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193
}

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);
3194
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
3195 3196 3197 3198
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

3199
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
3200
{
3201 3202 3203 3204
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
3205

3206 3207 3208
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
3209 3210 3211 3212 3213 3214 3215 3216 3217
}

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

	/*
3218
	 * Find the mode.
3219
	 */
A
Alan Cox 已提交
3220 3221 3222 3223

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

3224 3225
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
3226 3227 3228 3229 3230 3231 3232
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
		memset(&p, 0, sizeof(p));
3233
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
3234 3235
			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
3236
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
3237 3238 3239 3240 3241 3242 3243 3244 3245
			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
		}
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

3246
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3247 3248

	/*
3249 3250 3251
	 * 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
3252 3253
	 */

3254
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3255 3256 3257 3258 3259
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3260
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271
	 */

	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
3272

3273 3274 3275 3276 3277
	/* 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
3278 3279 3280 3281

	return 0;
}

3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332
/**
 *	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;
}

3333 3334 3335
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3336
 *	@sel: ATA_DNXFER_* selector
3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347
 *
 *	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
 */
3348
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3349
{
3350
	char buf[32];
3351 3352
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3353
	int quiet, highbit;
3354

3355 3356
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3357

3358 3359 3360 3361
	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);
3362

3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 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
	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);
	}
3415 3416 3417 3418 3419 3420 3421

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

	return 0;
}

T
Tejun Heo 已提交
3422
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3423
{
3424
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3425
	struct ata_eh_context *ehc = &dev->link->eh_context;
3426
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3427 3428
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3429
	unsigned int err_mask = 0;
3430
	int rc;
L
Linus Torvalds 已提交
3431

3432
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3433 3434 3435
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3436 3437 3438 3439 3440 3441 3442 3443 3444
	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);
	}
3445

3446 3447 3448 3449 3450 3451 3452 3453 3454 3455
	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;

3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470
	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;
	}
3471 3472
	/* 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 */
3473
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3474 3475
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3476
		ign_dev_err = 1;
3477

3478 3479 3480
	/* 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
3481

3482 3483 3484 3485 3486 3487
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3488

3489 3490
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3491

3492 3493 3494 3495
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3496
	return 0;
3497 3498 3499 3500 3501

 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
3502 3503 3504
}

/**
3505
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3506
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3507
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3508
 *
3509 3510 3511
 *	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
3512
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3513
 *
L
Linus Torvalds 已提交
3514
 *	LOCKING:
J
Jeff Garzik 已提交
3515
 *	PCI/etc. bus probe sem.
3516 3517 3518
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3519
 */
3520

3521
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3522
{
3523
	struct ata_port *ap = link->ap;
3524
	struct ata_device *dev;
3525
	int rc = 0, used_dma = 0, found = 0;
3526

3527
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3528
	ata_for_each_dev(dev, link, ENABLED) {
3529
		unsigned long pio_mask, dma_mask;
3530
		unsigned int mode_mask;
3531

3532 3533 3534 3535 3536 3537
		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
3538
		ata_dev_xfermask(dev);
3539
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3540

3541 3542
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3543 3544 3545 3546 3547 3548

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

3549 3550
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3551

3552
		found = 1;
3553
		if (ata_dma_enabled(dev))
3554
			used_dma = 1;
3555
	}
3556
	if (!found)
3557
		goto out;
3558 3559

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3560
	ata_for_each_dev(dev, link, ENABLED) {
3561
		if (dev->pio_mode == 0xff) {
3562
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3563
			rc = -EINVAL;
3564
			goto out;
3565 3566 3567 3568 3569 3570 3571
		}

		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
3572

3573
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3574 3575
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3576 3577 3578 3579 3580 3581 3582
			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
3583 3584

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3585
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3586
		rc = ata_dev_set_mode(dev);
3587
		if (rc)
3588
			goto out;
3589
	}
L
Linus Torvalds 已提交
3590

3591 3592
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3593
	 */
J
Jeff Garzik 已提交
3594
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3595
		ap->host->simplex_claimed = ap;
3596

3597 3598 3599 3600
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3601 3602
}

3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626
/**
 *	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;
3627
	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3628 3629
	int warned = 0;

T
Tejun Heo 已提交
3630 3631 3632 3633 3634 3635
	/* 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);

3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 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
	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.
 */
3698
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3699 3700
				int (*check_ready)(struct ata_link *link))
{
3701
	msleep(ATA_WAIT_AFTER_RESET);
3702 3703 3704 3705

	return ata_wait_ready(link, deadline, check_ready);
}

3706
/**
3707 3708
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3709
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3710
 *	@deadline: deadline jiffies for the operation
3711
 *
3712
*	Make sure SStatus of @link reaches stable state, determined by
3713 3714
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3715 3716
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3717 3718
 *	until timeout then returns 0 if DET is stable at 1.
 *
3719 3720 3721
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3722 3723 3724 3725 3726 3727
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3728 3729
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3730
{
3731 3732
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3733
	unsigned long last_jiffies, t;
3734 3735 3736
	u32 last, cur;
	int rc;

3737
	t = ata_deadline(jiffies, params[2]);
3738 3739 3740
	if (time_before(t, deadline))
		deadline = t;

3741
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3742 3743 3744 3745 3746 3747 3748
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3749
		msleep(interval);
3750
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3751 3752 3753 3754 3755
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3756
			if (cur == 1 && time_before(jiffies, deadline))
3757
				continue;
3758 3759
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3760 3761 3762 3763 3764 3765 3766 3767
				return 0;
			continue;
		}

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

3768 3769 3770
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3771
		if (time_after(jiffies, deadline))
3772
			return -EPIPE;
3773 3774 3775 3776
	}
}

/**
3777 3778
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3779
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3780
 *	@deadline: deadline jiffies for the operation
3781
 *
3782
 *	Resume SATA phy @link and debounce it.
3783 3784 3785 3786 3787 3788 3789
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3790 3791
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3792
{
3793
	u32 scontrol, serror;
3794 3795
	int rc;

3796
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3797
		return rc;
3798

3799
	scontrol = (scontrol & 0x0f0) | 0x300;
3800

3801
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3802
		return rc;
3803

3804 3805 3806 3807
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3808

3809 3810 3811
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3812
	/* clear SError, some PHYs require this even for SRST to work */
3813 3814 3815
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3816
	return rc != -EINVAL ? rc : 0;
3817 3818
}

3819
/**
3820
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3821
 *	@link: ATA link to be reset
3822
 *	@deadline: deadline jiffies for the operation
3823
 *
T
Tejun Heo 已提交
3824
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3825 3826 3827 3828
 *	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.
3829 3830 3831 3832 3833 3834 3835
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3836
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3837
{
T
Tejun Heo 已提交
3838
	struct ata_port *ap = link->ap;
3839
	struct ata_eh_context *ehc = &link->eh_context;
3840
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3841 3842 3843 3844 3845 3846
	int rc;

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

3847
	/* if SATA, resume link */
3848
	if (ap->flags & ATA_FLAG_SATA) {
3849
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3850 3851
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3852
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3853 3854 3855
					"link for reset (errno=%d)\n", rc);
	}

3856
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3857
	if (ata_phys_link_offline(link))
3858 3859
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3860 3861 3862
	return 0;
}

3863
/**
T
Tejun Heo 已提交
3864 3865 3866
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3867
 *	@deadline: deadline jiffies for the operation
3868 3869
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3870
 *
T
Tejun Heo 已提交
3871
 *	SATA phy-reset @link using DET bits of SControl register.
3872 3873 3874 3875 3876 3877 3878 3879
 *	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.
3880 3881 3882 3883 3884 3885 3886
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3887
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3888 3889
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3890
{
T
Tejun Heo 已提交
3891
	u32 scontrol;
3892
	int rc;
3893

3894 3895
	DPRINTK("ENTER\n");

3896 3897 3898
	if (online)
		*online = false;

3899
	if (sata_set_spd_needed(link)) {
3900 3901 3902 3903 3904
		/* 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.
		 */
3905
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3906
			goto out;
3907

3908
		scontrol = (scontrol & 0x0f0) | 0x304;
3909

3910
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3911
			goto out;
3912

3913
		sata_set_spd(link);
3914 3915 3916
	}

	/* issue phy wake/reset */
3917
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3918
		goto out;
3919

3920
	scontrol = (scontrol & 0x0f0) | 0x301;
3921

3922
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3923
		goto out;
3924

3925
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3926 3927 3928 3929
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3930 3931
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3932 3933 3934
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3935
	if (ata_phys_link_offline(link))
3936 3937 3938 3939 3940 3941
		goto out;

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

T
Tejun Heo 已提交
3942
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3943 3944 3945 3946 3947 3948 3949 3950
		/* 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;

3951 3952
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963
			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);
3964
 out:
3965 3966 3967 3968
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3969 3970
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3971
	}
3972 3973 3974 3975
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001
/**
 *	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;
}

4002
/**
4003
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
4004
 *	@link: the target ata_link
4005 4006 4007 4008 4009 4010 4011 4012 4013
 *	@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)
 */
4014
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
4015
{
4016 4017
	u32 serror;

4018 4019
	DPRINTK("ENTER\n");

4020 4021 4022 4023
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

4024
	/* print link status */
4025
	sata_print_link_status(link);
4026 4027 4028 4029

	DPRINTK("EXIT\n");
}

4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045
/**
 *	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
4046 4047
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
4048 4049
{
	const u16 *old_id = dev->id;
4050 4051
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4052 4053

	if (dev->class != new_class) {
4054 4055
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
4056 4057 4058
		return 0;
	}

4059 4060 4061 4062
	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]));
4063 4064

	if (strcmp(model[0], model[1])) {
4065 4066
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
4067 4068 4069 4070
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
4071 4072
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
4073 4074 4075 4076 4077 4078 4079
		return 0;
	}

	return 1;
}

/**
4080
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
4081
 *	@dev: target ATA device
4082
 *	@readid_flags: read ID flags
4083 4084 4085 4086 4087 4088 4089 4090 4091 4092
 *
 *	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
 */
4093
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4094
{
4095
	unsigned int class = dev->class;
T
Tejun Heo 已提交
4096
	u16 *id = (void *)dev->link->ap->sector_buf;
4097 4098
	int rc;

4099
	/* read ID data */
4100
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4101
	if (rc)
4102
		return rc;
4103 4104

	/* is the device still there? */
4105 4106
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
4107

4108
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4109 4110 4111 4112 4113 4114
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4115
 *	@new_class: new class code
4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126
 *	@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
 */
4127 4128
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4129
{
4130
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
4131
	u64 n_native_sectors = dev->n_native_sectors;
4132 4133 4134 4135 4136
	int rc;

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

4137 4138
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
4139 4140 4141
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
4142 4143 4144 4145 4146 4147
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

4148 4149 4150 4151
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4152 4153

	/* configure device according to the new ID */
4154
	rc = ata_dev_configure(dev);
4155 4156 4157 4158
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4159 4160
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
T
Tejun Heo 已提交
4161
		ata_dev_printk(dev, KERN_WARNING, "n_sectors mismatch "
4162 4163 4164
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
T
Tejun Heo 已提交
4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184
		/*
		 * Something could have caused HPA to be unlocked
		 * involuntarily.  If n_native_sectors hasn't changed
		 * and the new size matches it, keep the device.
		 */
		if (dev->n_native_sectors == n_native_sectors &&
		    dev->n_sectors > n_sectors &&
		    dev->n_sectors == n_native_sectors) {
			ata_dev_printk(dev, KERN_WARNING,
				       "new n_sectors matches native, probably "
				       "late HPA unlock, continuing\n");
			/* keep using the old n_sectors */
			dev->n_sectors = n_sectors;
		} else {
			/* restore original n_[native]_sectors and fail */
			dev->n_native_sectors = n_native_sectors;
			dev->n_sectors = n_sectors;
			rc = -ENODEV;
			goto fail;
		}
4185 4186 4187
	}

	return 0;
4188 4189

 fail:
4190
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4191 4192 4193
	return rc;
}

4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229
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 },
4230
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4231
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4232
	/* Odd clown on sil3726/4726 PMPs */
4233
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4234

4235
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4236
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4237
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4238

4239 4240 4241 4242
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4243
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4244
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4245 4246
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4247
	/* NCQ is broken */
4248
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4249
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4250
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4251
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4252
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4253

4254
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4255
	{ "ST31500341AS",	"SD15",		ATA_HORKAGE_NONCQ |
4256
						ATA_HORKAGE_FIRMWARE_WARN },
4257
	{ "ST31500341AS",	"SD16",		ATA_HORKAGE_NONCQ |
4258
						ATA_HORKAGE_FIRMWARE_WARN },
4259
	{ "ST31500341AS",	"SD17",		ATA_HORKAGE_NONCQ |
4260
						ATA_HORKAGE_FIRMWARE_WARN },
4261
	{ "ST31500341AS",	"SD18",		ATA_HORKAGE_NONCQ |
4262
						ATA_HORKAGE_FIRMWARE_WARN },
4263
	{ "ST31500341AS",	"SD19",		ATA_HORKAGE_NONCQ |
4264
						ATA_HORKAGE_FIRMWARE_WARN },
4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318

	{ "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 |
4319 4320
						ATA_HORKAGE_FIRMWARE_WARN },

4321 4322 4323 4324 4325
	/* 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, },
4326

4327 4328 4329 4330 4331
	/* 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 },
4332

T
Tejun Heo 已提交
4333 4334 4335
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4336 4337 4338
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4339
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4340

A
Alan Cox 已提交
4341 4342
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4343 4344 4345
	/* 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
4346
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4347 4348 4349
	{ "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
4350

4351 4352 4353
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },

4354 4355 4356
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },

4357 4358 4359 4360 4361 4362
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
	{ "PIONEER DVD-RW  DVRTD08",	"1.00",	ATA_HORKAGE_NOSETXFER },

4363 4364
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4365
};
4366

4367
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4368 4369 4370 4371 4372 4373 4374 4375 4376 4377
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4378
	else {
4379
		len = strlen(name);
4380 4381 4382 4383 4384 4385
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4386 4387 4388 4389

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4390
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4391
{
T
Tejun Heo 已提交
4392 4393
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4394
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4395

T
Tejun Heo 已提交
4396 4397
	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
4398

4399
	while (ad->model_num) {
4400
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4401 4402
			if (ad->model_rev == NULL)
				return ad->horkage;
4403
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4404
				return ad->horkage;
4405
		}
4406
		ad++;
4407
	}
L
Linus Torvalds 已提交
4408 4409 4410
	return 0;
}

4411 4412 4413 4414 4415 4416
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
4417
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4418 4419
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4420
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4421 4422
}

A
Alan Cox 已提交
4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437
/**
 *	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);
}

4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455
/**
 *	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
4456
	/* If the controller thinks we are 40 wire, we are. */
4457 4458
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4459 4460

	/* If the controller thinks we are 80 wire, we are. */
4461 4462
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4463 4464 4465 4466 4467

	/* 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
4468 4469
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4470 4471 4472 4473 4474 4475 4476 4477 4478 4479

	/* 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
4480 4481 4482
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4483 4484 4485 4486 4487 4488
				return 0;
		}
	}
	return 1;
}

4489 4490 4491 4492
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4493 4494 4495 4496
 *	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...
4497 4498 4499 4500
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4501
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4502
{
T
Tejun Heo 已提交
4503 4504
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4505
	struct ata_host *host = ap->host;
4506
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4507

4508
	/* controller modes available */
4509 4510 4511
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4512
	/* drive modes available */
4513 4514 4515
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4516

4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527
	/*
	 *	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));
	}

4528 4529
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4530 4531
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4532
	}
4533

4534
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4535
	    host->simplex_claimed && host->simplex_claimed != ap) {
4536 4537 4538
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4539
	}
4540

J
Jeff Garzik 已提交
4541 4542 4543
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4544
	if (ap->ops->mode_filter)
4545
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4546

4547 4548 4549 4550 4551 4552 4553 4554 4555 4556
	/* 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 */
4557
		if (cable_is_40wire(ap)) {
4558
			ata_dev_printk(dev, KERN_WARNING,
4559 4560 4561 4562
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4563 4564
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4565 4566 4567 4568 4569 4570
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4571 4572 4573
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4574
 *	LOCKING:
J
Jeff Garzik 已提交
4575
 *	PCI/etc. bus probe sem.
4576 4577 4578
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4579 4580
 */

T
Tejun Heo 已提交
4581
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4582
{
4583
	struct ata_taskfile tf;
4584
	unsigned int err_mask;
L
Linus Torvalds 已提交
4585 4586 4587 4588

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

T
Tejun Heo 已提交
4589 4590 4591
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4592
	ata_tf_init(dev, &tf);
4593 4594
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4595
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4596
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4597
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4598 4599
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4600 4601
	/* 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
4602
		tf.nsect = 0x01;
A
Alan Cox 已提交
4603 4604
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4605

4606
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4607 4608 4609 4610 4611

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4612
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4613 4614
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4615
 *	@feature: The sector count represents the feature to set
4616 4617
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4618
 *	on port @ap with sector count
4619 4620 4621 4622 4623 4624 4625
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4626 4627
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639
{
	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;
4640
	tf.nsect = feature;
4641

4642
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4643

4644 4645
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4646 4647
}

4648 4649 4650
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4651 4652
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4653 4654
 *
 *	LOCKING:
4655 4656 4657 4658
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4659
 */
T
Tejun Heo 已提交
4660 4661
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4662
{
4663
	struct ata_taskfile tf;
4664
	unsigned int err_mask;
4665 4666 4667

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4668
		return AC_ERR_INVALID;
4669 4670 4671 4672

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

T
Tejun Heo 已提交
4673
	ata_tf_init(dev, &tf);
4674 4675 4676 4677 4678
	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 */
4679

4680
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4681 4682 4683 4684 4685
	/* 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;
4686

4687 4688
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4689 4690
}

L
Linus Torvalds 已提交
4691
/**
J
Jeff Garzik 已提交
4692 4693 4694 4695
 *	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
4696 4697
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4698
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4699
 */
4700
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4701 4702
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4703
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4704 4705
	int dir = qc->dma_dir;

4706
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4707

4708
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4709

4710
	if (qc->n_elem)
4711
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4712 4713

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4714
	qc->sg = NULL;
L
Linus Torvalds 已提交
4715 4716 4717
}

/**
4718
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4719 4720
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4721 4722 4723 4724
 *	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
4725
 *	LOCKING:
T
Tejun Heo 已提交
4726 4727 4728 4729 4730
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4731
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4732 4733
{
	struct ata_port *ap = qc->ap;
4734

T
Tejun Heo 已提交
4735 4736 4737
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4738 4739
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4740
		return 1;
4741

T
Tejun Heo 已提交
4742 4743
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4744

T
Tejun Heo 已提交
4745 4746
	return 0;
}
L
Linus Torvalds 已提交
4747

T
Tejun Heo 已提交
4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765
/**
 *	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;
4766

T
Tejun Heo 已提交
4767 4768 4769 4770 4771 4772 4773
	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;
	}
4774

T
Tejun Heo 已提交
4775 4776
	return ATA_DEFER_LINK;
}
4777

T
Tejun Heo 已提交
4778
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4779

T
Tejun Heo 已提交
4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799
/**
 *	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;
}
4800

T
Tejun Heo 已提交
4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817
/**
 *	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
4818

T
Tejun Heo 已提交
4819
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4820

T
Tejun Heo 已提交
4821 4822 4823
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4824

T
Tejun Heo 已提交
4825
	DPRINTK("%d sg elements mapped\n", n_elem);
4826
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4827 4828
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4829

T
Tejun Heo 已提交
4830
	return 0;
L
Linus Torvalds 已提交
4831 4832
}

T
Tejun Heo 已提交
4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845
/**
 *	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)
4846
{
T
Tejun Heo 已提交
4847 4848
#ifdef __BIG_ENDIAN
	unsigned int i;
4849

T
Tejun Heo 已提交
4850 4851 4852
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4853 4854
}

4855 4856
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4857
 *	@ap: target port
4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884
 *
 *	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
4885 4886 4887 4888 4889
/**
 *	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
4890
 *	None.
L
Linus Torvalds 已提交
4891 4892
 */

4893
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4894
{
T
Tejun Heo 已提交
4895
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4896 4897
	struct ata_queued_cmd *qc;

4898
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4899 4900 4901 4902 4903
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4904
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4905 4906 4907 4908 4909
	}

	return qc;
}

4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924
/**
 *	ata_qc_free - free unused ata_queued_cmd
 *	@qc: Command to complete
 *
 *	Designed to free unused ata_queued_cmd object
 *	in case something prevents using it.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4925
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4926 4927 4928 4929 4930 4931 4932 4933 4934

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

4935
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4936
{
4937
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4938
	struct ata_link *link = qc->dev->link;
4939

4940 4941
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4942 4943 4944 4945

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

4946
	/* command should be marked inactive atomically with qc completion */
4947
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4948
		link->sactive &= ~(1 << qc->tag);
4949 4950 4951
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4952
		link->active_tag = ATA_TAG_POISON;
4953 4954 4955 4956 4957 4958 4959
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4960

4961 4962 4963 4964 4965
	/* 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;
4966
	ap->qc_active &= ~(1 << qc->tag);
4967

L
Linus Torvalds 已提交
4968
	/* call completion callback */
4969
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4970 4971
}

4972 4973 4974 4975 4976
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4977
	ap->ops->qc_fill_rtf(qc);
4978 4979
}

4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995
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;
}

4996 4997 4998 4999 5000 5001 5002 5003
/**
 *	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
5004
 *	spin_lock_irqsave(host lock)
5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023
 */
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) {
5024 5025 5026
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

5027 5028 5029 5030
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5031 5032 5033 5034
			/* always fill result TF for failed qc */
			fill_result_tf(qc);

			if (!ata_tag_internal(qc->tag))
5035
				ata_qc_schedule_eh(qc);
5036 5037 5038
			else
				__ata_qc_complete(qc);
			return;
5039 5040
		}

5041 5042
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

5043 5044
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5045
			fill_result_tf(qc);
5046

5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061
		/* 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;
5062 5063 5064 5065

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
5066 5067
		}

5068 5069 5070
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

5071 5072 5073 5074 5075 5076 5077
		__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)
5078
			fill_result_tf(qc);
5079 5080 5081 5082 5083

		__ata_qc_complete(qc);
	}
}

5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094
/**
 *	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
5095
 *	spin_lock_irqsave(host lock)
5096 5097 5098 5099
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
5100
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112
{
	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;
	}

5113
	while (done_mask) {
5114
		struct ata_queued_cmd *qc;
5115
		unsigned int tag = __ffs(done_mask);
5116

5117 5118
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
5119 5120 5121
			ata_qc_complete(qc);
			nr_done++;
		}
5122
		done_mask &= ~(1 << tag);
5123 5124 5125 5126 5127
	}

	return nr_done;
}

L
Linus Torvalds 已提交
5128 5129 5130 5131 5132 5133 5134 5135 5136 5137
/**
 *	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
5138
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5139
 */
5140
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5141 5142
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5143
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
5144
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5145

5146 5147 5148 5149
	/* 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.
	 */
5150
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5151

5152
	if (ata_is_ncq(prot)) {
5153
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5154 5155 5156

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5157
		link->sactive |= 1 << qc->tag;
5158
	} else {
5159
		WARN_ON_ONCE(link->sactive);
5160 5161

		ap->nr_active_links++;
T
Tejun Heo 已提交
5162
		link->active_tag = qc->tag;
5163 5164
	}

5165
	qc->flags |= ATA_QCFLAG_ACTIVE;
5166
	ap->qc_active |= 1 << qc->tag;
5167

5168 5169 5170
	/* 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
5171
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5172

T
Tejun Heo 已提交
5173
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5174
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5175 5176
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
5177

T
Tejun Heo 已提交
5178
	/* if device is sleeping, schedule reset and abort the link */
5179
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5180
		link->eh_info.action |= ATA_EH_RESET;
5181 5182 5183 5184 5185
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5186 5187
	ap->ops->qc_prep(qc);

5188 5189 5190 5191
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5192

5193
sg_err:
5194 5195 5196
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5197 5198
}

5199 5200
/**
 *	sata_scr_valid - test whether SCRs are accessible
5201
 *	@link: ATA link to test SCR accessibility for
5202
 *
5203
 *	Test whether SCRs are accessible for @link.
5204 5205 5206 5207 5208 5209 5210
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5211
int sata_scr_valid(struct ata_link *link)
5212
{
5213 5214
	struct ata_port *ap = link->ap;

5215
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5216 5217 5218 5219
}

/**
 *	sata_scr_read - read SCR register of the specified port
5220
 *	@link: ATA link to read SCR for
5221 5222 5223
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5224
 *	Read SCR register @reg of @link into *@val.  This function is
5225 5226
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5227 5228
 *
 *	LOCKING:
5229
 *	None if @link is ap->link.  Kernel thread context otherwise.
5230 5231 5232 5233
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5234
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5235
{
5236 5237
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5238
			return link->ap->ops->scr_read(link, reg, val);
5239 5240 5241 5242
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5243 5244 5245 5246
}

/**
 *	sata_scr_write - write SCR register of the specified port
5247
 *	@link: ATA link to write SCR for
5248 5249 5250
 *	@reg: SCR to write
 *	@val: value to write
 *
5251
 *	Write @val to SCR register @reg of @link.  This function is
5252 5253
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5254 5255
 *
 *	LOCKING:
5256
 *	None if @link is ap->link.  Kernel thread context otherwise.
5257 5258 5259 5260
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5261
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5262
{
5263 5264
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5265
			return link->ap->ops->scr_write(link, reg, val);
5266 5267
		return -EOPNOTSUPP;
	}
5268

5269
	return sata_pmp_scr_write(link, reg, val);
5270 5271 5272 5273
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5274
 *	@link: ATA link to write SCR for
5275 5276 5277 5278 5279 5280 5281
 *	@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:
5282
 *	None if @link is ap->link.  Kernel thread context otherwise.
5283 5284 5285 5286
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5287
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5288
{
5289 5290
	if (ata_is_host_link(link)) {
		int rc;
5291

5292
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5293
			rc = link->ap->ops->scr_write(link, reg, val);
5294
			if (rc == 0)
T
Tejun Heo 已提交
5295
				rc = link->ap->ops->scr_read(link, reg, &val);
5296 5297 5298
			return rc;
		}
		return -EOPNOTSUPP;
5299
	}
5300 5301

	return sata_pmp_scr_write(link, reg, val);
5302 5303 5304
}

/**
T
Tejun Heo 已提交
5305
 *	ata_phys_link_online - test whether the given link is online
5306
 *	@link: ATA link to test
5307
 *
5308 5309 5310
 *	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).
5311 5312 5313 5314 5315
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5316
 *	True if the port online status is available and online.
5317
 */
T
Tejun Heo 已提交
5318
bool ata_phys_link_online(struct ata_link *link)
5319 5320 5321
{
	u32 sstatus;

5322
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5323
	    ata_sstatus_online(sstatus))
5324 5325
		return true;
	return false;
5326 5327 5328
}

/**
T
Tejun Heo 已提交
5329
 *	ata_phys_link_offline - test whether the given link is offline
5330
 *	@link: ATA link to test
5331
 *
5332 5333 5334
 *	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).
5335 5336 5337 5338 5339
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5340
 *	True if the port offline status is available and offline.
5341
 */
T
Tejun Heo 已提交
5342
bool ata_phys_link_offline(struct ata_link *link)
5343 5344 5345
{
	u32 sstatus;

5346
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5347
	    !ata_sstatus_online(sstatus))
5348 5349
		return true;
	return false;
5350
}
E
Edward Falk 已提交
5351

T
Tejun Heo 已提交
5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403
/**
 *	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));
}

5404
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5405 5406 5407
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5408 5409 5410 5411
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5412 5413
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5414
		struct ata_link *link;
5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433

		/* 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
5434
		ata_for_each_link(link, ap, HOST_FIRST) {
5435 5436 5437
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455

		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
5456 5457
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5458 5459
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5460
 *	Suspend @host.  Actual operation is performed by EH.  This
5461 5462 5463 5464 5465 5466 5467 5468 5469
 *	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
5470
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5471
{
5472
	int rc;
5473

5474 5475 5476 5477 5478 5479
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5480
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5481 5482
	if (rc == 0)
		host->dev->power.power_state = mesg;
5483 5484 5485 5486
	return rc;
}

/**
J
Jeff Garzik 已提交
5487 5488
 *	ata_host_resume - resume host
 *	@host: host to resume
5489
 *
J
Jeff Garzik 已提交
5490
 *	Resume @host.  Actual operation is performed by EH.  This
5491 5492 5493 5494 5495 5496
 *	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
5497
void ata_host_resume(struct ata_host *host)
5498
{
T
Tejun Heo 已提交
5499
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5500
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5501
	host->dev->power.power_state = PMSG_ON;
5502 5503 5504

	/* reenable link pm */
	ata_lpm_disable(host);
5505
}
5506
#endif
5507

5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519
/**
 *	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.
 */
5520
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5521
{
5522
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5523

5524 5525
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5526 5527 5528 5529 5530 5531
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542
/**
 *	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
5543
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5544
	struct ata_port *ap = link->ap;
5545 5546
	unsigned long flags;

T
Tejun Heo 已提交
5547
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5548 5549
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5550

5551 5552
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5553
	 * host lock.
5554
	 */
5555
	spin_lock_irqsave(ap->lock, flags);
5556
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5557
	dev->horkage = 0;
5558
	spin_unlock_irqrestore(ap->lock, flags);
5559

5560 5561
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5562 5563 5564 5565 5566
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5567 5568 5569 5570
/**
 *	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
5571
 *	@pmp: Port multiplier port number
5572 5573 5574 5575 5576 5577
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5578
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5579 5580 5581 5582 5583 5584 5585
{
	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
5586
	link->pmp = pmp;
5587 5588 5589 5590 5591 5592 5593 5594 5595
	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
5596 5597 5598
#ifdef CONFIG_ATA_ACPI
		dev->gtf_filter = ata_acpi_gtf_filter;
#endif
5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615
		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.
 */
5616
int sata_link_init_spd(struct ata_link *link)
5617
{
5618
	u8 spd;
5619 5620
	int rc;

T
Tejun Heo 已提交
5621
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5622 5623 5624
	if (rc)
		return rc;

T
Tejun Heo 已提交
5625
	spd = (link->saved_scontrol >> 4) & 0xf;
5626 5627 5628
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5629
	ata_force_link_limits(link);
5630

5631 5632 5633 5634 5635
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5636
/**
5637 5638
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5639
 *
5640 5641 5642 5643
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5644
 *
L
Linus Torvalds 已提交
5645
 *	LOCKING:
5646
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5647
 */
5648
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5649
{
5650
	struct ata_port *ap;
L
Linus Torvalds 已提交
5651

5652 5653 5654 5655 5656 5657
	DPRINTK("ENTER\n");

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

5658
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5659
	ap->lock = &host->lock;
5660
	ap->flags = ATA_FLAG_DISABLED;
5661
	ap->print_id = -1;
L
Linus Torvalds 已提交
5662
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5663
	ap->host = host;
5664
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5665
	ap->last_ctl = 0xFF;
5666 5667 5668 5669 5670 5671

#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
5672
#else
5673
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5674
#endif
L
Linus Torvalds 已提交
5675

T
Tejun Heo 已提交
5676
#ifdef CONFIG_ATA_SFF
5677
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
5678 5679
#else
	INIT_DELAYED_WORK(&ap->port_task, NULL);
T
Tejun Heo 已提交
5680
#endif
5681 5682
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5683
	INIT_LIST_HEAD(&ap->eh_done_q);
5684
	init_waitqueue_head(&ap->eh_wait_q);
5685
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5686 5687 5688
	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
5689

5690 5691
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5692
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5693 5694 5695 5696 5697 5698 5699 5700

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

5701 5702 5703 5704 5705
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5706 5707 5708
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5709 5710 5711 5712
		if (!ap)
			continue;

		if (ap->scsi_host)
5713 5714
			scsi_host_put(ap->scsi_host);

5715
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5716
		kfree(ap->slave_link);
5717
		kfree(ap);
5718 5719 5720
		host->ports[i] = NULL;
	}

5721
	dev_set_drvdata(gendev, NULL);
5722 5723
}

5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788
/**
 *	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;
}

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
/**
 *	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;
5827
		ap->link.flags |= pi->link_flags;
5828 5829 5830 5831 5832 5833 5834 5835 5836
		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
5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898
/**
 *	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;
}

5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916
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);
}

5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938
/**
 *	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)
{
5939
	static DEFINE_SPINLOCK(lock);
5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966
	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);
}

5967 5968 5969 5970 5971 5972 5973
/**
 *	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
5974 5975
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5976 5977 5978 5979 5980 5981 5982 5983 5984
 *
 *	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)
{
5985 5986
	int have_stop = 0;
	void *start_dr = NULL;
5987 5988 5989 5990 5991
	int i, rc;

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

5992 5993
	ata_finalize_port_ops(host->ops);

5994 5995 5996
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5997 5998
		ata_finalize_port_ops(ap->ops);

5999 6000 6001
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017
		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];

6018 6019 6020
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
6021
				if (rc != -ENODEV)
A
Andrew Morton 已提交
6022 6023 6024
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
6025 6026 6027 6028 6029 6030
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

6031 6032
	if (start_dr)
		devres_add(host->dev, start_dr);
6033 6034 6035 6036 6037 6038 6039 6040 6041 6042
	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);
	}
6043
	devres_free(start_dr);
6044 6045 6046
	return rc;
}

6047
/**
J
Jeff Garzik 已提交
6048 6049 6050 6051 6052
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6053 6054 6055 6056 6057
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6058
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6059
void ata_host_init(struct ata_host *host, struct device *dev,
6060
		   unsigned long flags, struct ata_port_operations *ops)
6061
{
J
Jeff Garzik 已提交
6062 6063 6064 6065
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6066 6067
}

6068 6069 6070 6071 6072

static void async_port_probe(void *data, async_cookie_t cookie)
{
	int rc;
	struct ata_port *ap = data;
6073 6074 6075 6076 6077

	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
6078 6079
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
6080
	 */
6081
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6082 6083
		async_synchronize_cookie(cookie);

6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119
	/* 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.
			 */
		}
	}
6120 6121 6122 6123 6124 6125

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

	ata_scsi_scan_host(ap, 1);

6126
}
6127 6128 6129 6130 6131 6132 6133 6134 6135 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
/**
 *	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;

6170 6171 6172
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6173 6174 6175 6176 6177 6178 6179 6180 6181 6182
	/* 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 */
6183
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6184 6185
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6186

6187
		/* print per-port info to dmesg */
6188 6189 6190
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6191
		if (!ata_port_is_dummy(ap)) {
6192 6193
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6194
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6195
					ata_mode_string(xfer_mask),
6196
					ap->link.eh_info.desc);
6197 6198
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6199 6200 6201
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

V
Vegard Nossum 已提交
6202
	/* perform each probe asynchronously */
6203 6204
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6205
		async_schedule(async_port_probe, ap);
6206 6207 6208 6209 6210
	}

	return 0;
}

6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223
/**
 *	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.
 *
6224 6225 6226 6227
 *	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.
 *
6228 6229 6230 6231 6232 6233 6234 6235 6236 6237
 *	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)
{
6238
	int i, rc;
6239 6240 6241 6242 6243

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

6244 6245 6246 6247 6248 6249
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6250 6251 6252 6253 6254
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6255 6256
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6257

6258 6259 6260 6261 6262 6263 6264 6265
	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;
}

6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276
/**
 *	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).
 */
6277
static void ata_port_detach(struct ata_port *ap)
6278 6279 6280 6281
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6282
		goto skip_eh;
6283 6284

	/* tell EH we're leaving & flush EH */
6285
	spin_lock_irqsave(ap->lock, flags);
6286
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6287
	ata_port_schedule_eh(ap);
6288
	spin_unlock_irqrestore(ap->lock, flags);
6289

T
Tejun Heo 已提交
6290
	/* wait till EH commits suicide */
6291 6292
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6293 6294
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6295

6296
	cancel_rearming_delayed_work(&ap->hotplug_task);
6297

6298
 skip_eh:
6299
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6300
	scsi_remove_host(ap->scsi_host);
6301 6302
}

T
Tejun Heo 已提交
6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317
/**
 *	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]);
6318 6319 6320

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6321 6322
}

6323 6324
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6325 6326 6327 6328
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6329 6330 6331
 *	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
6332 6333 6334 6335
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6336
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6337
{
6338
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
6339
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6340

T
Tejun Heo 已提交
6341
	ata_host_detach(host);
L
Linus Torvalds 已提交
6342 6343 6344
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6345
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376
{
	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
6377

6378
#ifdef CONFIG_PM
6379
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6380 6381
{
	pci_save_state(pdev);
6382
	pci_disable_device(pdev);
6383

6384
	if (mesg.event & PM_EVENT_SLEEP)
6385
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6386 6387
}

6388
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6389
{
6390 6391
	int rc;

J
Jens Axboe 已提交
6392 6393
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6394

T
Tejun Heo 已提交
6395
	rc = pcim_enable_device(pdev);
6396 6397 6398 6399 6400 6401
	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
6402
	pci_set_master(pdev);
6403
	return 0;
6404 6405
}

6406
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6407
{
J
Jeff Garzik 已提交
6408
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6409 6410
	int rc = 0;

J
Jeff Garzik 已提交
6411
	rc = ata_host_suspend(host, mesg);
6412 6413 6414
	if (rc)
		return rc;

6415
	ata_pci_device_do_suspend(pdev, mesg);
6416 6417 6418 6419 6420 6421

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6422
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6423
	int rc;
6424

6425 6426 6427 6428
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6429
}
6430 6431
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6432 6433
#endif /* CONFIG_PCI */

6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487
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) },
6488 6489 6490
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 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
	};
	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
6611 6612 6613

static int __init ata_init(void)
{
6614 6615
	ata_parse_force_param();

L
Linus Torvalds 已提交
6616 6617
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
6618
		goto free_force_tbl;
L
Linus Torvalds 已提交
6619

6620
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
6621 6622
	if (!ata_aux_wq)
		goto free_wq;
6623

L
Linus Torvalds 已提交
6624 6625
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6626 6627 6628 6629 6630 6631

free_wq:
	destroy_workqueue(ata_wq);
free_force_tbl:
	kfree(ata_force_tbl);
	return -ENOMEM;
L
Linus Torvalds 已提交
6632 6633 6634 6635
}

static void __exit ata_exit(void)
{
6636
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6637
	destroy_workqueue(ata_wq);
6638
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6639 6640
}

6641
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6642 6643
module_exit(ata_exit);

6644
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6645
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664

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;
}

6665 6666 6667 6668 6669
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6670 6671
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688
 *
 *	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,
6689
		      unsigned long interval, unsigned long timeout)
6690
{
6691
	unsigned long deadline;
6692 6693 6694 6695 6696 6697 6698 6699
	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.
	 */
6700
	deadline = ata_deadline(jiffies, timeout);
6701

6702 6703
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
		msleep(interval);
6704 6705 6706 6707 6708 6709
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6710 6711 6712
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6713
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6714
{
T
Tejun Heo 已提交
6715
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6716 6717
}

T
Tejun Heo 已提交
6718
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6719
{
T
Tejun Heo 已提交
6720
	/* truly dummy */
T
Tejun Heo 已提交
6721 6722
}

6723
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6724 6725
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6726
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6727 6728
};

6729 6730 6731 6732
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6733 6734 6735 6736 6737 6738
/*
 * 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.
 */
6739 6740 6741
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6742 6743
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6744
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6745
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6746 6747
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6748
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6749
EXPORT_SYMBOL_GPL(ata_host_init);
6750
EXPORT_SYMBOL_GPL(ata_host_alloc);
6751
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6752
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6753
EXPORT_SYMBOL_GPL(ata_host_start);
6754
EXPORT_SYMBOL_GPL(ata_host_register);
6755
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6756
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6757
EXPORT_SYMBOL_GPL(ata_sg_init);
6758
EXPORT_SYMBOL_GPL(ata_qc_complete);
6759
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6760
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6761 6762
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6763 6764 6765 6766 6767 6768 6769
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
6770
EXPORT_SYMBOL_GPL(ata_port_start);
6771
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6772
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6773
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6774
EXPORT_SYMBOL_GPL(ata_port_probe);
6775
EXPORT_SYMBOL_GPL(ata_dev_disable);
6776
EXPORT_SYMBOL_GPL(sata_set_spd);
6777
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6778 6779
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6780
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6781
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6782
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6783
EXPORT_SYMBOL_GPL(ata_std_postreset);
6784 6785
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6786
EXPORT_SYMBOL_GPL(ata_port_disable);
6787
EXPORT_SYMBOL_GPL(ata_ratelimit);
6788
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6789 6790
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6791
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6792
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6793 6794 6795 6796
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);
6797 6798
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6799
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6800 6801
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6802
#endif /* CONFIG_PM */
6803 6804
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6805
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6806 6807
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6808
EXPORT_SYMBOL_GPL(ata_pio_queue_task);
6809
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6810
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6811 6812
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6813
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6814

L
Linus Torvalds 已提交
6815 6816 6817
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6818
#ifdef CONFIG_PM
6819 6820
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6821 6822
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6823
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6824
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6825

T
Tejun Heo 已提交
6826 6827 6828
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6829 6830 6831 6832
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6833
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6834
EXPORT_SYMBOL_GPL(ata_link_abort);
6835
EXPORT_SYMBOL_GPL(ata_port_abort);
6836
EXPORT_SYMBOL_GPL(ata_port_freeze);
6837
EXPORT_SYMBOL_GPL(sata_async_notification);
6838 6839
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6840 6841
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6842
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6843
EXPORT_SYMBOL_GPL(ata_do_eh);
6844
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6845 6846 6847 6848

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6849
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6850
EXPORT_SYMBOL_GPL(ata_cable_sata);