libata-core.c 160.1 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 <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);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");

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static int atapi_dmadir = 0;
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module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");

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int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");

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int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 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, "Disables the use of ACPI in probe/suspend/resume when set");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");

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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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/*
 * Iterator helpers.  Don't use directly.
 *
 * LOCKING:
 * Host lock or EH context.
 */
struct ata_link *__ata_port_next_link(struct ata_port *ap,
				      struct ata_link *link, bool dev_only)
{
	/* NULL link indicates start of iteration */
	if (!link) {
		if (dev_only && sata_pmp_attached(ap))
			return ap->pmp_link;
		return &ap->link;
	}

	/* we just iterated over the host link, what's next? */
	if (ata_is_host_link(link)) {
		if (!sata_pmp_attached(ap))
			return NULL;
		return ap->pmp_link;
	}

	/* iterate to the next PMP link */
	if (++link < ap->pmp_link + ap->nr_pmp_links)
		return link;
	return NULL;
}

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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
 *	points to the host link whether PMP is attached or not.
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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, i;

	if (ata_is_host_link(link))
		linkno = 15;
	else
		linkno = link->pmp;

	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;

	/* allow n.15 for the first device attached to host port */
	if (ata_is_host_link(dev->link) && devno == 0)
		alt_devno = 15;

	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;

	/* allow n.15 for the first device attached to host port */
	if (ata_is_host_link(dev->link) && devno == 0)
		alt_devno = 15;

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

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

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

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

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

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

	return block;
}

603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
/**
 *	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;

630
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
		/* 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;
}

726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
/**
 *	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.
 */
741 742 743
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
744 745 746 747 748 749
{
	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);
}

750 751 752 753 754 755 756 757 758 759
/**
 *	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.
 */
760 761
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
762 763 764 765 766 767 768 769 770
{
	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;
}

771
static const struct ata_xfer_ent {
772
	int shift, bits;
773 774
	u8 base;
} ata_xfer_tbl[] = {
775 776 777
	{ 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 },
778 779 780 781 782 783 784 785 786 787 788 789 790 791
	{ -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:
792
 *	Matching XFER_* value, 0xff if no match found.
793
 */
794
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
795 796 797 798 799 800 801
{
	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;
802
	return 0xff;
803 804 805 806 807 808 809 810 811 812 813 814 815 816
}

/**
 *	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.
 */
817
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
818 819 820 821 822
{
	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)
823 824
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
	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.
 */
840
int ata_xfer_mode2shift(unsigned long xfer_mode)
841 842 843 844 845 846 847 848 849
{
	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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/**
851 852
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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853 854
 *
 *	Determine string which represents the highest speed
855
 *	(highest bit in @modemask).
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856 857 858 859 860 861
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
862
 *	@mode_mask, or the constant C string "<n/a>".
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863
 */
864
const char *ata_mode_string(unsigned long xfer_mask)
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{
866 867 868 869 870 871
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
872 873
		"PIO5",
		"PIO6",
874 875 876
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
877 878
		"MWDMA3",
		"MWDMA4",
879 880 881 882 883 884 885 886 887
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
888
	int highbit;
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890 891 892
	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>";
}

896 897 898 899 900 901 902 903 904 905 906 907
static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
	};

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

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void ata_dev_disable(struct ata_device *dev)
909
{
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	if (ata_dev_enabled(dev)) {
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		if (ata_msg_drv(dev->link->ap))
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			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
913
		ata_acpi_on_disable(dev);
914 915
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
916 917 918 919
		dev->class++;
	}
}

920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975
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;

976 977 978 979 980
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
981 982 983 984 985 986 987 988 989
		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;

990 991 992 993 994
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
995 996 997 998 999 1000 1001 1002 1003 1004 1005
		break;
	}

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

	return 0;
}

/**
 *	ata_dev_enable_pm - enable SATA interface power management
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Stephen Hemminger 已提交
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 *	@dev:  device to enable power management
 *	@policy: the link power management policy
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
 *
 *	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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1037
#ifdef CONFIG_PM
1038 1039
/**
 *	ata_dev_disable_pm - disable SATA interface power management
S
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1040
 *	@dev: device to disable power management
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
 *
 *	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 */
1059 1060 1061 1062

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1063
	ap->link.eh_info.action |= ATA_EH_LPM;
1064 1065 1066 1067
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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1068
#ifdef CONFIG_PM
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
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];
		ata_port_for_each_link(link, ap) {
			ata_link_for_each_dev(dev, link)
				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 */
1095

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1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
/**
 *	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:
1108 1109
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
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1112 1113 1114 1115
{
	/* 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.
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
	 *
	 * 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.
L
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1130
	 */
1131
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
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1132 1133 1134 1135
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1136
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
L
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1137 1138 1139 1140
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1141 1142 1143 1144 1145 1146
	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)) {
1147
		printk(KERN_INFO "ata: SEMB device ignored\n");
1148 1149 1150
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

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1151 1152 1153 1154 1155
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
1156
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
 *	@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.
 */

1170 1171
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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1172 1173 1174
{
	unsigned int c;

1175 1176
	BUG_ON(len & 1);

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1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

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

		ofs++;
		len -= 2;
	}
}

1191
/**
1192
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1193 1194 1195 1196 1197
 *	@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.
 *
1198
 *	This function is identical to ata_id_string except that it
1199 1200 1201 1202 1203 1204
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1205 1206
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1207 1208 1209
{
	unsigned char *p;

1210
	ata_id_string(id, s, ofs, len - 1);
1211 1212 1213 1214 1215 1216

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
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1217

T
Tejun Heo 已提交
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

1233
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
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1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
{
	u64 sectors = 0;

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

1244
	return sectors;
A
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1245 1246
}

1247
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1248 1249 1250 1251 1252 1253 1254 1255
{
	u64 sectors = 0;

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

1256
	return sectors;
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1257 1258 1259
}

/**
1260 1261 1262
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
Alan Cox 已提交
1263
 *
1264 1265
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
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1266
 *
1267 1268 1269
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
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1270
 */
1271
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1272
{
1273
	unsigned int err_mask;
A
Alan Cox 已提交
1274
	struct ata_taskfile tf;
1275
	int lba48 = ata_id_has_lba48(dev->id);
A
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1276 1277 1278

	ata_tf_init(dev, &tf);

1279
	/* always clear all address registers */
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1280 1281
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1282 1283 1284 1285 1286
	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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1287 1288

	tf.protocol |= ATA_PROT_NODATA;
1289 1290
	tf.device |= ATA_LBA;

1291
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1292 1293 1294 1295 1296 1297 1298
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
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1299

1300
	if (lba48)
1301
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1302
	else
1303
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1304
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1305
		(*max_sectors)--;
1306
	return 0;
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1307 1308 1309
}

/**
1310 1311
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1312
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
1313
 *
1314 1315 1316 1317 1318 1319
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
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1320
 */
T
Tejun Heo 已提交
1321
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1322
{
1323
	unsigned int err_mask;
A
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1324
	struct ata_taskfile tf;
1325
	int lba48 = ata_id_has_lba48(dev->id);
A
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1326 1327 1328 1329 1330 1331

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1332 1333 1334 1335 1336 1337 1338 1339

	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
1340
	} else {
1341 1342
		tf.command = ATA_CMD_SET_MAX;

T
Tejun Heo 已提交
1343 1344 1345
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1346
	tf.protocol |= ATA_PROT_NODATA;
1347
	tf.device |= ATA_LBA;
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1348 1349 1350 1351 1352

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

1353
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363
	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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1364 1365 1366 1367 1368 1369 1370 1371 1372
}

/**
 *	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
1373 1374 1375
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
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1376
 */
T
Tejun Heo 已提交
1377
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1378
{
T
Tejun Heo 已提交
1379 1380 1381 1382
	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;
1383
	int rc;
J
Jeff Garzik 已提交
1384

T
Tejun Heo 已提交
1385 1386 1387 1388
	/* 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))
1389
		return 0;
A
Alan Cox 已提交
1390

T
Tejun Heo 已提交
1391 1392 1393
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
Tejun Heo 已提交
1394 1395
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1396
		 */
T
Tejun Heo 已提交
1397
		if (rc == -EACCES || !ata_ignore_hpa) {
T
Tejun Heo 已提交
1398
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1399
				       "broken, skipping HPA handling\n");
T
Tejun Heo 已提交
1400 1401 1402 1403 1404
			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
1405
		}
T
Tejun Heo 已提交
1406

T
Tejun Heo 已提交
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
		return rc;
	}

	/* 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
Alan Cox 已提交
1460 1461
}

L
Linus Torvalds 已提交
1462 1463
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1464
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1465
 *
1466 1467
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1468 1469 1470 1471 1472
 *
 *	LOCKING:
 *	caller.
 */

1473
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1474 1475 1476 1477 1478 1479
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1480 1481 1482 1483 1484
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1485 1486 1487 1488 1489
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1490 1491 1492 1493 1494
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1495 1496
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1497 1498
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1499 1500
}

1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
/**
 *	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
 */
1516
unsigned long ata_id_xfermask(const u16 *id)
1517
{
1518
	unsigned long pio_mask, mwdma_mask, udma_mask;
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529

	/* 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.
		 */
1530
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1531
		if (mode < 5)	/* Valid PIO range */
1532
			pio_mask = (2 << mode) - 1;
1533 1534
		else
			pio_mask = 1;
1535 1536 1537 1538 1539 1540 1541 1542 1543 1544

		/* 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;
1545

1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
		int pio = id[163] & 0x7;
		int dma = (id[163] >> 3) & 7;

		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);
	}

1563 1564 1565
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1566 1567 1568 1569

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1570
/**
1571
 *	ata_pio_queue_task - Queue port_task
T
Tejun Heo 已提交
1572
 *	@ap: The ata_port to queue port_task for
1573
 *	@fn: workqueue function to be scheduled
1574
 *	@data: data for @fn to use
1575
 *	@delay: delay time in msecs for workqueue function
T
Tejun Heo 已提交
1576 1577 1578 1579 1580 1581 1582
 *
 *	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
1583
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
T
Tejun Heo 已提交
1584 1585 1586 1587 1588
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
1589
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1590
{
1591
	ap->port_task_data = data;
T
Tejun Heo 已提交
1592

1593
	/* may fail if ata_port_flush_task() in progress */
1594
	queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
T
Tejun Heo 已提交
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
}

/**
 *	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");

1611
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1612

1613
	if (ata_msg_ctl(ap))
1614
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
T
Tejun Heo 已提交
1615 1616
}

1617
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1618
{
1619
	struct completion *waiting = qc->private_data;
1620 1621 1622 1623 1624

	complete(waiting);
}

/**
1625
 *	ata_exec_internal_sg - execute libata internal command
1626 1627
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1628
 *	@cdb: CDB for packet command
1629
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1630
 *	@sgl: sg list for the data buffer of the command
1631
 *	@n_elem: Number of sg entries
1632
 *	@timeout: Timeout in msecs (0 for default)
1633 1634 1635 1636 1637 1638 1639 1640 1641
 *
 *	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.
1642 1643 1644
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1645
 */
1646 1647
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1648
			      int dma_dir, struct scatterlist *sgl,
1649
			      unsigned int n_elem, unsigned long timeout)
1650
{
T
Tejun Heo 已提交
1651 1652
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1653
	u8 command = tf->command;
1654
	int auto_timeout = 0;
1655
	struct ata_queued_cmd *qc;
1656
	unsigned int tag, preempted_tag;
1657
	u32 preempted_sactive, preempted_qc_active;
1658
	int preempted_nr_active_links;
1659
	DECLARE_COMPLETION_ONSTACK(wait);
1660
	unsigned long flags;
1661
	unsigned int err_mask;
1662
	int rc;
1663

1664
	spin_lock_irqsave(ap->lock, flags);
1665

1666
	/* no internal command while frozen */
1667
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1668
		spin_unlock_irqrestore(ap->lock, flags);
1669 1670 1671
		return AC_ERR_SYSTEM;
	}

1672
	/* initialize internal qc */
1673

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
	/* 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;

1684
	if (test_and_set_bit(tag, &ap->qc_allocated))
1685
		BUG();
1686
	qc = __ata_qc_from_tag(ap, tag);
1687 1688 1689 1690 1691 1692 1693

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

T
Tejun Heo 已提交
1694 1695
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1696
	preempted_qc_active = ap->qc_active;
1697
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1698 1699
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1700
	ap->qc_active = 0;
1701
	ap->nr_active_links = 0;
1702 1703

	/* prepare & issue qc */
1704
	qc->tf = *tf;
1705 1706
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1707
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1708 1709
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1710
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1711
		struct scatterlist *sg;
1712

J
Jens Axboe 已提交
1713 1714
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1715

J
Jens Axboe 已提交
1716
		ata_sg_init(qc, sgl, n_elem);
1717
		qc->nbytes = buflen;
1718 1719
	}

1720
	qc->private_data = &wait;
1721 1722
	qc->complete_fn = ata_qc_complete_internal;

1723
	ata_qc_issue(qc);
1724

1725
	spin_unlock_irqrestore(ap->lock, flags);
1726

1727 1728 1729 1730 1731 1732 1733 1734
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1735 1736

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1737 1738

	ata_port_flush_task(ap);
1739

1740
	if (!rc) {
1741
		spin_lock_irqsave(ap->lock, flags);
1742 1743 1744

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1745 1746
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1747
		 */
1748
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1749 1750 1751 1752 1753 1754
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1755

1756 1757
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1758
					"qc timeout (cmd 0x%x)\n", command);
1759 1760
		}

1761
		spin_unlock_irqrestore(ap->lock, flags);
1762 1763
	}

1764 1765 1766 1767
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
	/* 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;
1778 1779
	}

1780
	/* finish up */
1781
	spin_lock_irqsave(ap->lock, flags);
1782

1783
	*tf = qc->result_tf;
1784 1785 1786
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1787 1788
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1789
	ap->qc_active = preempted_qc_active;
1790
	ap->nr_active_links = preempted_nr_active_links;
1791

1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802
	/* 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.
	 */
1803
	if (ap->flags & ATA_FLAG_DISABLED) {
1804 1805 1806 1807
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1808
	spin_unlock_irqrestore(ap->lock, flags);
1809

1810 1811 1812
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1813
	return err_mask;
1814 1815
}

1816
/**
1817
 *	ata_exec_internal - execute libata internal command
1818 1819 1820 1821 1822 1823
 *	@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
1824
 *	@timeout: Timeout in msecs (0 for default)
1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
 *
 *	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,
1837 1838
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1839
{
1840 1841
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1842

1843 1844 1845 1846 1847 1848
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1849

1850 1851
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1852 1853
}

1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866
/**
 *	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
1867
 */
1868
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1869 1870 1871 1872 1873 1874 1875 1876 1877
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1878
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1879 1880
}

1881 1882 1883 1884 1885 1886 1887
/**
 *	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.
 */
J
Jeff Garzik 已提交
1888

1889 1890
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1891 1892
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1893
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1894
		return 0;
A
Alan Cox 已提交
1895 1896 1897 1898 1899
	/* 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))
1900
		return 1;
A
Alan Cox 已提交
1901 1902
	return 0;
}
1903

A
Alan Cox 已提交
1904 1905 1906 1907 1908 1909 1910
/**
 *	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.
 */
J
Jeff Garzik 已提交
1911

A
Alan Cox 已提交
1912 1913
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1914 1915
	/* 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
1916
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1917 1918 1919 1920
		/* 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
1921 1922
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1923 1924
		}
	}
A
Alan Cox 已提交
1925
	return 3 << ATA_SHIFT_PIO;
1926 1927
}

1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
/**
 *	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
1945
/**
1946 1947 1948
 *	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)
1949
 *	@flags: ATA_READID_* flags
1950
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1951
 *
1952 1953
 *	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
1954 1955
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1956
 *
1957
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1958
 *	now we abort if we hit that case.
1959
 *
L
Linus Torvalds 已提交
1960
 *	LOCKING:
1961 1962 1963 1964
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1965
 */
1966
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1967
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1968
{
T
Tejun Heo 已提交
1969
	struct ata_port *ap = dev->link->ap;
1970
	unsigned int class = *p_class;
1971
	struct ata_taskfile tf;
1972 1973
	unsigned int err_mask = 0;
	const char *reason;
1974
	int may_fallback = 1, tried_spinup = 0;
1975
	int rc;
L
Linus Torvalds 已提交
1976

1977
	if (ata_msg_ctl(ap))
1978
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
1979

1980
retry:
T
Tejun Heo 已提交
1981
	ata_tf_init(dev, &tf);
1982

1983 1984
	switch (class) {
	case ATA_DEV_ATA:
1985
		tf.command = ATA_CMD_ID_ATA;
1986 1987
		break;
	case ATA_DEV_ATAPI:
1988
		tf.command = ATA_CMD_ID_ATAPI;
1989 1990 1991 1992 1993
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1994 1995
	}

1996
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006

	/* 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
2007

2008 2009 2010 2011 2012
	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);

2013
	if (err_mask) {
2014
		if (err_mask & AC_ERR_NODEV_HINT) {
2015 2016
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
2017 2018 2019
			return -ENOENT;
		}

2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042
		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;
2043 2044
		}

2045 2046
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
2047 2048 2049
		goto err_out;
	}

2050 2051 2052 2053 2054
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

2055
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
2056

2057
	/* sanity check */
2058
	rc = -EINVAL;
A
Alan Cox 已提交
2059
	reason = "device reports invalid type";
2060 2061 2062 2063 2064 2065 2066

	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;
2067 2068
	}

2069 2070 2071 2072 2073 2074 2075
	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.
		 */
2076
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2077
		if (err_mask && id[2] != 0x738c) {
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
			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;
	}

2090
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2091 2092 2093
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2094 2095
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2096 2097
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2098 2099 2100
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2101 2102
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2103
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2104 2105 2106 2107 2108 2109 2110 2111 2112
			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.
			 */
2113
			flags &= ~ATA_READID_POSTRESET;
2114 2115 2116 2117 2118
			goto retry;
		}
	}

	*p_class = class;
2119

2120 2121 2122
	return 0;

 err_out:
T
Tejun Heo 已提交
2123
	if (ata_msg_warn(ap))
2124
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2125
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2126 2127 2128
	return rc;
}

T
Tejun Heo 已提交
2129
static inline u8 ata_dev_knobble(struct ata_device *dev)
2130
{
T
Tejun Heo 已提交
2131 2132
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2133 2134
}

2135 2136 2137
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2138
	struct ata_port *ap = dev->link->ap;
2139 2140 2141 2142 2143 2144
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
T
Tejun Heo 已提交
2145
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2146 2147 2148
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2149
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2150
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2151 2152 2153 2154 2155 2156 2157 2158 2159
		dev->flags |= ATA_DFLAG_NCQ;
	}

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

2160
/**
2161 2162 2163 2164 2165
 *	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.
2166 2167
 *
 *	LOCKING:
2168 2169 2170 2171
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2172
 */
2173
int ata_dev_configure(struct ata_device *dev)
2174
{
T
Tejun Heo 已提交
2175 2176
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2177
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2178
	const u16 *id = dev->id;
2179
	unsigned long xfer_mask;
2180
	char revbuf[7];		/* XYZ-99\0 */
2181 2182
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2183
	int rc;
2184

2185
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2186
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2187
			       __func__);
2188
		return 0;
2189 2190
	}

2191
	if (ata_msg_probe(ap))
2192
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2193

T
Tejun Heo 已提交
2194 2195
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2196
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2197

2198 2199 2200 2201 2202 2203 2204
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
		ata_dev_printk(dev, KERN_INFO,
			       "unsupported device, disabling\n");
		ata_dev_disable(dev);
		return 0;
	}

2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
	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;
	}

T
Tejun Heo 已提交
2215 2216 2217 2218
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2219

T
Tejun Heo 已提交
2220 2221 2222 2223 2224
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2225
	/* print device capabilities */
2226
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2227 2228 2229
		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",
2230
			       __func__,
2231 2232
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2233

2234
	/* initialize to-be-configured parameters */
2235
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2236 2237 2238 2239 2240 2241 2242
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
2243 2244 2245 2246
	/*
	 * common ATA, ATAPI feature tests
	 */

2247
	/* find max transfer mode; for printk only */
2248
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2249

2250 2251
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2252

2253 2254 2255 2256 2257 2258 2259
	/* 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
2260 2261
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2262 2263
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
2264 2265 2266
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2267
			snprintf(revbuf, 7, "CFA");
2268
		} else {
2269
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2270 2271 2272 2273 2274 2275
			/* 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");
		}
2276

2277
		dev->n_sectors = ata_id_n_sectors(id);
2278

2279 2280 2281
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

2282
		if (ata_id_has_lba(id)) {
2283
			const char *lba_desc;
2284
			char ncq_desc[20];
2285

2286 2287
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2288
			if (ata_id_has_lba48(id)) {
2289
				dev->flags |= ATA_DFLAG_LBA48;
2290
				lba_desc = "LBA48";
2291 2292 2293 2294

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2295
			}
2296

2297 2298 2299
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2300
			/* print device info to dmesg */
2301 2302 2303 2304 2305 2306 2307
			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",
2308
					(unsigned long long)dev->n_sectors,
2309 2310
					dev->multi_count, lba_desc, ncq_desc);
			}
2311
		} else {
2312 2313 2314
			/* CHS */

			/* Default translation */
2315 2316 2317
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2318

2319
			if (ata_id_current_chs_valid(id)) {
2320
				/* Current CHS translation is valid. */
2321 2322 2323
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2324 2325 2326
			}

			/* print device info to dmesg */
2327
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2328
				ata_dev_printk(dev, KERN_INFO,
2329 2330 2331
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2332
				ata_dev_printk(dev, KERN_INFO,
2333 2334 2335 2336 2337
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2338 2339
		}

2340
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2341 2342 2343
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2344
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2345 2346
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2347
		const char *dma_dir_string = "";
2348
		u32 sntf;
2349

2350
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2351
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2352
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2353 2354
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2355
			rc = -EINVAL;
L
Linus Torvalds 已提交
2356 2357
			goto err_out_nosup;
		}
2358
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2359

2360 2361 2362 2363
		/* 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.
2364
		 */
2365
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2366
		    (!sata_pmp_attached(ap) ||
2367
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2368 2369
			unsigned int err_mask;

2370
			/* issue SET feature command to turn this on */
2371 2372
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2373
			if (err_mask)
2374
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2375 2376 2377
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2378
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2379 2380
				atapi_an_string = ", ATAPI AN";
			}
2381 2382
		}

2383
		if (ata_id_cdb_intr(dev->id)) {
2384
			dev->flags |= ATA_DFLAG_CDB_INTR;
2385 2386
			cdb_intr_string = ", CDB intr";
		}
2387

2388 2389 2390 2391 2392
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2393
		/* print device info to dmesg */
2394
		if (ata_msg_drv(ap) && print_info)
2395
			ata_dev_printk(dev, KERN_INFO,
2396
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2397
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2398
				       ata_mode_string(xfer_mask),
2399 2400
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2401 2402
	}

2403 2404 2405 2406 2407
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2408 2409 2410 2411 2412 2413 2414
	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;
	}

2415 2416
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2417
	if (ata_dev_knobble(dev)) {
2418
		if (ata_msg_drv(ap) && print_info)
2419 2420
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2421
		dev->udma_mask &= ATA_UDMA5;
2422 2423 2424
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2425
	if ((dev->class == ATA_DEV_ATAPI) &&
2426
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2427
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2428 2429
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2430

T
Tejun Heo 已提交
2431
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2432 2433
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2434

2435 2436 2437 2438 2439 2440 2441
	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;
	}

2442
	if (ap->ops->dev_config)
2443
		ap->ops->dev_config(dev);
2444

2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
	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");
		}
	}

2460
	return 0;
L
Linus Torvalds 已提交
2461 2462

err_out_nosup:
2463
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2464
		ata_dev_printk(dev, KERN_DEBUG,
2465
			       "%s: EXIT, err\n", __func__);
2466
	return rc;
L
Linus Torvalds 已提交
2467 2468
}

A
Alan Cox 已提交
2469
/**
2470
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2471 2472
 *	@ap: port
 *
2473
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2474 2475 2476 2477 2478 2479 2480 2481 2482
 *	detection.
 */

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

/**
2483
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2484 2485
 *	@ap: port
 *
2486
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
 *	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
2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518
/**
 *	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
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
/**
 *	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
2531 2532 2533 2534
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2535 2536 2537 2538
 *	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
2539
 *	LOCKING:
J
Jeff Garzik 已提交
2540
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2541 2542
 *
 *	RETURNS:
2543
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2544 2545
 */

2546
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2547
{
2548
	unsigned int classes[ATA_MAX_DEVICES];
2549
	int tries[ATA_MAX_DEVICES];
2550
	int rc;
2551
	struct ata_device *dev;
L
Linus Torvalds 已提交
2552

2553
	ata_port_probe(ap);
2554

2555 2556
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2557 2558

 retry:
T
Tejun Heo 已提交
2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577
	ata_link_for_each_dev(dev, &ap->link) {
		/* 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);
	}

2578
	/* reset and determine device classes */
2579
	ap->ops->phy_reset(ap);
2580

2581
	ata_link_for_each_dev(dev, &ap->link) {
2582 2583 2584 2585 2586
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2587

2588
		dev->class = ATA_DEV_UNKNOWN;
2589
	}
L
Linus Torvalds 已提交
2590

2591
	ata_port_probe(ap);
2592

2593 2594 2595 2596
	/* 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 */

2597
	ata_link_for_each_dev_reverse(dev, &ap->link) {
2598 2599
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2600

2601
		if (!ata_dev_enabled(dev))
2602 2603
			continue;

2604 2605
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2606 2607
		if (rc)
			goto fail;
2608 2609
	}

A
Alan Cox 已提交
2610 2611 2612 2613
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

A
Alan Cox 已提交
2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
	/* We may have SATA bridge glue hiding here irrespective of the
	   reported cable types and sensed types */
	ata_link_for_each_dev(dev, &ap->link) {
		if (!ata_dev_enabled(dev))
			continue;
		/* SATA drives indicate we have a bridge. We don't know which
		   end of the link the bridge is which is a problem */
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;
	}

2625 2626 2627
	/* 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 */

2628
	ata_link_for_each_dev(dev, &ap->link) {
2629 2630
		if (!ata_dev_enabled(dev))
			continue;
2631

T
Tejun Heo 已提交
2632
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2633
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2634
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2635 2636
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2637 2638
	}

2639
	/* configure transfer mode */
2640
	rc = ata_set_mode(&ap->link, &dev);
2641
	if (rc)
2642
		goto fail;
L
Linus Torvalds 已提交
2643

2644 2645
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2646
			return 0;
L
Linus Torvalds 已提交
2647

2648 2649
	/* no device present, disable port */
	ata_port_disable(ap);
2650
	return -ENODEV;
2651 2652

 fail:
2653 2654
	tries[dev->devno]--;

2655 2656
	switch (rc) {
	case -EINVAL:
2657
		/* eeek, something went very wrong, give up */
2658 2659
		tries[dev->devno] = 0;
		break;
2660 2661 2662 2663

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2664
	case -EIO:
2665 2666 2667 2668
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2669
			sata_down_spd_limit(&ap->link);
2670 2671
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2672 2673
	}

2674
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2675
		ata_dev_disable(dev);
2676

2677
	goto retry;
L
Linus Torvalds 已提交
2678 2679 2680
}

/**
J
Jeff Garzik 已提交
2681 2682
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2683
 *
J
Jeff Garzik 已提交
2684 2685 2686
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2687
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2688
 *	serialization.
L
Linus Torvalds 已提交
2689 2690 2691 2692
 */

void ata_port_probe(struct ata_port *ap)
{
2693
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2694 2695
}

2696 2697
/**
 *	sata_print_link_status - Print SATA link status
2698
 *	@link: SATA link to printk link status about
2699 2700 2701 2702 2703 2704
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2705
static void sata_print_link_status(struct ata_link *link)
2706
{
2707
	u32 sstatus, scontrol, tmp;
2708

2709
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2710
		return;
2711
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2712

2713
	if (ata_link_online(link)) {
2714
		tmp = (sstatus >> 4) & 0xf;
2715
		ata_link_printk(link, KERN_INFO,
2716 2717
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2718
	} else {
2719
		ata_link_printk(link, KERN_INFO,
2720 2721
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2722 2723 2724
	}
}

2725 2726 2727 2728 2729 2730 2731
/**
 *	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
 */
2732

T
Tejun Heo 已提交
2733
struct ata_device *ata_dev_pair(struct ata_device *adev)
2734
{
T
Tejun Heo 已提交
2735 2736
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2737
	if (!ata_dev_enabled(pair))
2738 2739 2740 2741
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2742
/**
J
Jeff Garzik 已提交
2743 2744
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2745
 *
J
Jeff Garzik 已提交
2746 2747 2748 2749 2750
 *	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
2751
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2752
 *	serialization.
L
Linus Torvalds 已提交
2753 2754 2755 2756
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2757 2758
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2759
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2760 2761
}

2762
/**
2763
 *	sata_down_spd_limit - adjust SATA spd limit downward
2764
 *	@link: Link to adjust SATA spd limit for
2765
 *
2766
 *	Adjust SATA spd limit of @link downward.  Note that this
2767
 *	function only adjusts the limit.  The change must be applied
2768
 *	using sata_set_spd().
2769 2770 2771 2772 2773 2774 2775
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2776
int sata_down_spd_limit(struct ata_link *link)
2777
{
2778 2779
	u32 sstatus, spd, mask;
	int rc, highbit;
2780

2781
	if (!sata_scr_valid(link))
2782 2783 2784
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2785
	 * If not, use cached value in link->sata_spd.
2786
	 */
2787
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2788 2789 2790
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2791
		spd = link->sata_spd;
2792

2793
	mask = link->sata_spd_limit;
2794 2795
	if (mask <= 1)
		return -EINVAL;
2796 2797

	/* unconditionally mask off the highest bit */
2798 2799 2800
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2801 2802 2803 2804 2805 2806 2807 2808 2809
	/* 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? */
2810 2811 2812
	if (!mask)
		return -EINVAL;

2813
	link->sata_spd_limit = mask;
2814

2815
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2816
			sata_spd_string(fls(mask)));
2817 2818 2819 2820

	return 0;
}

2821
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2822
{
2823 2824
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2825

2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
	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;
2837
	else
2838
		target = fls(limit);
2839 2840

	spd = (*scontrol >> 4) & 0xf;
2841
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2842

2843
	return spd != target;
2844 2845 2846
}

/**
2847
 *	sata_set_spd_needed - is SATA spd configuration needed
2848
 *	@link: Link in question
2849 2850
 *
 *	Test whether the spd limit in SControl matches
2851
 *	@link->sata_spd_limit.  This function is used to determine
2852 2853 2854 2855 2856 2857 2858 2859 2860
 *	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
2861
static int sata_set_spd_needed(struct ata_link *link)
2862 2863 2864
{
	u32 scontrol;

2865
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2866
		return 1;
2867

2868
	return __sata_set_spd_needed(link, &scontrol);
2869 2870 2871
}

/**
2872
 *	sata_set_spd - set SATA spd according to spd limit
2873
 *	@link: Link to set SATA spd for
2874
 *
2875
 *	Set SATA spd of @link according to sata_spd_limit.
2876 2877 2878 2879 2880 2881
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2882
 *	changed.  Negative errno if SCR registers are inaccessible.
2883
 */
2884
int sata_set_spd(struct ata_link *link)
2885 2886
{
	u32 scontrol;
2887
	int rc;
2888

2889
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2890
		return rc;
2891

2892
	if (!__sata_set_spd_needed(link, &scontrol))
2893 2894
		return 0;

2895
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2896 2897
		return rc;

2898 2899 2900
	return 1;
}

A
Alan Cox 已提交
2901 2902 2903 2904 2905
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2906
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2907
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2908 2909 2910
 * 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
2911 2912 2913
 */

static const struct ata_timing ata_timing[] = {
2914 2915 2916 2917 2918 2919 2920 2921
/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
A
Alan Cox 已提交
2922

2923 2924 2925
	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
A
Alan Cox 已提交
2926

2927 2928 2929
	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
2930
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
2931
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
A
Alan Cox 已提交
2932 2933

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
2934 2935 2936 2937 2938 2939 2940
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
A
Alan Cox 已提交
2941 2942 2943 2944

	{ 0xFF }
};

2945 2946
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
	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->cycle   = EZ(t->cycle   * 1000,  T);
	q->udma    = EZ(t->udma    * 1000, UT);
}

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);
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2973
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2974
{
2975 2976 2977 2978
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2979

2980 2981 2982
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
2983 2984 2985 2986 2987 2988 2989 2990 2991
}

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;

	/*
2992
	 * Find the mode.
2993
	 */
A
Alan Cox 已提交
2994 2995 2996 2997

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

2998 2999
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
3000 3001 3002 3003 3004 3005 3006
	/*
	 * 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));
3007
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
3008 3009
			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];
3010
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
3011 3012 3013 3014 3015 3016 3017 3018 3019
			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.
	 */

3020
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3021 3022

	/*
3023 3024 3025
	 * 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
3026 3027
	 */

3028
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3029 3030 3031 3032 3033
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3034
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045
	 */

	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
3046

3047 3048 3049 3050 3051
	/* 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
3052 3053 3054 3055

	return 0;
}

3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106
/**
 *	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;
}

3107 3108 3109
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3110
 *	@sel: ATA_DNXFER_* selector
3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121
 *
 *	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
 */
3122
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3123
{
3124
	char buf[32];
3125 3126
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3127
	int quiet, highbit;
3128

3129 3130
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3131

3132 3133 3134 3135
	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);
3136

3137 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 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188
	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);
	}
3189 3190 3191 3192 3193 3194 3195

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

	return 0;
}

T
Tejun Heo 已提交
3196
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3197
{
T
Tejun Heo 已提交
3198
	struct ata_eh_context *ehc = &dev->link->eh_context;
3199 3200
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3201 3202
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
3203

3204
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3205 3206 3207
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
3208
	err_mask = ata_dev_set_xfermode(dev);
3209

3210 3211 3212 3213 3214 3215 3216 3217 3218 3219
	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;

3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234
	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;
	}
3235 3236
	/* 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 */
3237
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3238 3239
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3240
		ign_dev_err = 1;
3241

3242 3243 3244
	/* 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
3245

3246 3247 3248 3249 3250 3251
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3252

3253 3254
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3255

3256 3257 3258 3259
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3260
	return 0;
3261 3262 3263 3264 3265

 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
3266 3267 3268
}

/**
3269
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3270
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3271
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3272
 *
3273 3274 3275
 *	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
3276
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3277
 *
L
Linus Torvalds 已提交
3278
 *	LOCKING:
J
Jeff Garzik 已提交
3279
 *	PCI/etc. bus probe sem.
3280 3281 3282
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3283
 */
3284

3285
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3286
{
3287
	struct ata_port *ap = link->ap;
3288
	struct ata_device *dev;
3289
	int rc = 0, used_dma = 0, found = 0;
3290

3291
	/* step 1: calculate xfer_mask */
3292
	ata_link_for_each_dev(dev, link) {
3293
		unsigned long pio_mask, dma_mask;
3294
		unsigned int mode_mask;
3295

3296
		if (!ata_dev_enabled(dev))
3297 3298
			continue;

3299 3300 3301 3302 3303 3304
		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
3305
		ata_dev_xfermask(dev);
3306
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3307

3308 3309
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3310 3311 3312 3313 3314 3315

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

3316 3317
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3318

3319
		found = 1;
3320
		if (ata_dma_enabled(dev))
3321
			used_dma = 1;
3322
	}
3323
	if (!found)
3324
		goto out;
3325 3326

	/* step 2: always set host PIO timings */
3327
	ata_link_for_each_dev(dev, link) {
3328 3329 3330
		if (!ata_dev_enabled(dev))
			continue;

3331
		if (dev->pio_mode == 0xff) {
3332
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3333
			rc = -EINVAL;
3334
			goto out;
3335 3336 3337 3338 3339 3340 3341
		}

		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
3342

3343
	/* step 3: set host DMA timings */
3344
	ata_link_for_each_dev(dev, link) {
3345
		if (!ata_dev_enabled(dev) || !ata_dma_enabled(dev))
3346 3347 3348 3349 3350 3351 3352
			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
3353 3354

	/* step 4: update devices' xfer mode */
3355
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
3356
		/* don't update suspended devices' xfer mode */
3357
		if (!ata_dev_enabled(dev))
3358 3359
			continue;

T
Tejun Heo 已提交
3360
		rc = ata_dev_set_mode(dev);
3361
		if (rc)
3362
			goto out;
3363
	}
L
Linus Torvalds 已提交
3364

3365 3366
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3367
	 */
J
Jeff Garzik 已提交
3368
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3369
		ap->host->simplex_claimed = ap;
3370

3371 3372 3373 3374
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
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
/**
 *	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;
3401
	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465
	int warned = 0;

	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.
 */
3466
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3467 3468
				int (*check_ready)(struct ata_link *link))
{
3469
	msleep(ATA_WAIT_AFTER_RESET);
3470 3471 3472 3473

	return ata_wait_ready(link, deadline, check_ready);
}

3474
/**
3475 3476
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3477
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3478
 *	@deadline: deadline jiffies for the operation
3479
 *
3480
*	Make sure SStatus of @link reaches stable state, determined by
3481 3482
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3483 3484
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3485 3486
 *	until timeout then returns 0 if DET is stable at 1.
 *
3487 3488 3489
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3490 3491 3492 3493 3494 3495
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3496 3497
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3498
{
3499 3500
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3501
	unsigned long last_jiffies, t;
3502 3503 3504
	u32 last, cur;
	int rc;

3505
	t = ata_deadline(jiffies, params[2]);
3506 3507 3508
	if (time_before(t, deadline))
		deadline = t;

3509
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3510 3511 3512 3513 3514 3515 3516
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3517
		msleep(interval);
3518
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3519 3520 3521 3522 3523
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3524
			if (cur == 1 && time_before(jiffies, deadline))
3525
				continue;
3526 3527
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3528 3529 3530 3531 3532 3533 3534 3535
				return 0;
			continue;
		}

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

3536 3537 3538
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3539
		if (time_after(jiffies, deadline))
3540
			return -EPIPE;
3541 3542 3543 3544
	}
}

/**
3545 3546
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3547
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3548
 *	@deadline: deadline jiffies for the operation
3549
 *
3550
 *	Resume SATA phy @link and debounce it.
3551 3552 3553 3554 3555 3556 3557
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3558 3559
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3560
{
3561
	u32 scontrol, serror;
3562 3563
	int rc;

3564
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3565
		return rc;
3566

3567
	scontrol = (scontrol & 0x0f0) | 0x300;
3568

3569
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3570
		return rc;
3571

3572 3573 3574 3575
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3576

3577 3578 3579
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3580
	/* clear SError, some PHYs require this even for SRST to work */
3581 3582 3583
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3584
	return rc != -EINVAL ? rc : 0;
3585 3586
}

3587
/**
3588
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3589
 *	@link: ATA link to be reset
3590
 *	@deadline: deadline jiffies for the operation
3591
 *
T
Tejun Heo 已提交
3592
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3593 3594 3595 3596
 *	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.
3597 3598 3599 3600 3601 3602 3603
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3604
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3605
{
T
Tejun Heo 已提交
3606
	struct ata_port *ap = link->ap;
3607
	struct ata_eh_context *ehc = &link->eh_context;
3608
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3609 3610 3611 3612 3613 3614
	int rc;

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

3615
	/* if SATA, resume link */
3616
	if (ap->flags & ATA_FLAG_SATA) {
3617
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3618 3619
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3620
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3621 3622 3623
					"link for reset (errno=%d)\n", rc);
	}

3624 3625 3626 3627
	/* no point in trying softreset on offline link */
	if (ata_link_offline(link))
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3628 3629 3630
	return 0;
}

3631
/**
T
Tejun Heo 已提交
3632 3633 3634
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3635
 *	@deadline: deadline jiffies for the operation
3636 3637
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3638
 *
T
Tejun Heo 已提交
3639
 *	SATA phy-reset @link using DET bits of SControl register.
3640 3641 3642 3643 3644 3645 3646 3647
 *	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.
3648 3649 3650 3651 3652 3653 3654
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3655
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3656 3657
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3658
{
T
Tejun Heo 已提交
3659
	u32 scontrol;
3660
	int rc;
3661

3662 3663
	DPRINTK("ENTER\n");

3664 3665 3666
	if (online)
		*online = false;

3667
	if (sata_set_spd_needed(link)) {
3668 3669 3670 3671 3672
		/* 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.
		 */
3673
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3674
			goto out;
3675

3676
		scontrol = (scontrol & 0x0f0) | 0x304;
3677

3678
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3679
			goto out;
3680

3681
		sata_set_spd(link);
3682 3683 3684
	}

	/* issue phy wake/reset */
3685
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3686
		goto out;
3687

3688
	scontrol = (scontrol & 0x0f0) | 0x301;
3689

3690
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3691
		goto out;
3692

3693
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3694 3695 3696 3697
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3698 3699
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3700 3701 3702 3703 3704 3705 3706 3707 3708 3709
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
	if (ata_link_offline(link))
		goto out;

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

T
Tejun Heo 已提交
3710
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3711 3712 3713 3714 3715 3716 3717 3718
		/* 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;

3719 3720
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731
			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);
3732
 out:
3733 3734 3735 3736
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3737 3738
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3739
	}
3740 3741 3742 3743
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769
/**
 *	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;
}

3770
/**
3771
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3772
 *	@link: the target ata_link
3773 3774 3775 3776 3777 3778 3779 3780 3781
 *	@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)
 */
3782
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3783
{
3784 3785
	u32 serror;

3786 3787
	DPRINTK("ENTER\n");

3788 3789 3790 3791
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3792
	/* print link status */
3793
	sata_print_link_status(link);
3794 3795 3796 3797

	DPRINTK("EXIT\n");
}

3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813
/**
 *	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
3814 3815
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3816 3817
{
	const u16 *old_id = dev->id;
3818 3819
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3820 3821

	if (dev->class != new_class) {
3822 3823
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3824 3825 3826
		return 0;
	}

3827 3828 3829 3830
	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]));
3831 3832

	if (strcmp(model[0], model[1])) {
3833 3834
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3835 3836 3837 3838
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3839 3840
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3841 3842 3843 3844 3845 3846 3847
		return 0;
	}

	return 1;
}

/**
3848
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3849
 *	@dev: target ATA device
3850
 *	@readid_flags: read ID flags
3851 3852 3853 3854 3855 3856 3857 3858 3859 3860
 *
 *	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
 */
3861
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3862
{
3863
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3864
	u16 *id = (void *)dev->link->ap->sector_buf;
3865 3866
	int rc;

3867
	/* read ID data */
3868
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3869
	if (rc)
3870
		return rc;
3871 3872

	/* is the device still there? */
3873 3874
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3875

3876
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3877 3878 3879 3880 3881 3882
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3883
 *	@new_class: new class code
3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894
 *	@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
 */
3895 3896
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3897
{
3898
	u64 n_sectors = dev->n_sectors;
3899 3900 3901 3902 3903
	int rc;

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

3904 3905 3906 3907 3908 3909 3910 3911 3912
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
	    new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

3913 3914 3915 3916
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3917 3918

	/* configure device according to the new ID */
3919
	rc = ata_dev_configure(dev);
3920 3921 3922 3923
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
3924 3925
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
3926 3927 3928 3929
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
3930 3931 3932 3933

		/* restore original n_sectors */
		dev->n_sectors = n_sectors;

3934 3935 3936 3937 3938
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3939 3940

 fail:
3941
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3942 3943 3944
	return rc;
}

3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980
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 },
3981
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
3982
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3983
	/* Odd clown on sil3726/4726 PMPs */
3984
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
3985

3986
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3987
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3988

3989 3990 3991 3992
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
3993
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
3994
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3995 3996
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3997
	/* NCQ is broken */
3998
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3999
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4000
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4001
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4002

4003 4004 4005 4006 4007
	/* 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, },
4008

4009 4010 4011 4012 4013
	/* 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 },
4014

4015 4016 4017
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4018
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4019

A
Alan Cox 已提交
4020 4021
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4022 4023 4024
	/* 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
4025
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4026 4027 4028
	{ "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
4029

4030 4031
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4032
};
4033

4034
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4035 4036 4037 4038 4039 4040 4041 4042 4043 4044
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4045
	else {
4046
		len = strlen(name);
4047 4048 4049 4050 4051 4052
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4053 4054 4055 4056

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4057
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4058
{
T
Tejun Heo 已提交
4059 4060
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4061
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4062

T
Tejun Heo 已提交
4063 4064
	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
4065

4066
	while (ad->model_num) {
4067
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4068 4069
			if (ad->model_rev == NULL)
				return ad->horkage;
4070
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4071
				return ad->horkage;
4072
		}
4073
		ad++;
4074
	}
L
Linus Torvalds 已提交
4075 4076 4077
	return 0;
}

4078 4079 4080 4081 4082 4083
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
4084
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4085 4086
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4087
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4088 4089
}

A
Alan Cox 已提交
4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104
/**
 *	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);
}

4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128
/**
 *	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;

	/* If the controller thinks we are 40 wire, we are */
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
	/* If the controller thinks we are 80 wire, we are */
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
A
Alan Cox 已提交
4129 4130 4131 4132
	/* 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 */
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151
	/* 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
        */
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link) {
			if (!ata_is_40wire(dev))
				return 0;
		}
	}
	return 1;
}

4152 4153 4154 4155
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4156 4157 4158 4159
 *	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...
4160 4161 4162 4163
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4164
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4165
{
T
Tejun Heo 已提交
4166 4167
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4168
	struct ata_host *host = ap->host;
4169
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4170

4171
	/* controller modes available */
4172 4173 4174
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4175
	/* drive modes available */
4176 4177 4178
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4179

4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190
	/*
	 *	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));
	}

4191 4192
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4193 4194
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4195
	}
4196

4197
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4198
	    host->simplex_claimed && host->simplex_claimed != ap) {
4199 4200 4201
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4202
	}
4203

J
Jeff Garzik 已提交
4204 4205 4206
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4207
	if (ap->ops->mode_filter)
4208
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4209

4210 4211 4212 4213 4214 4215 4216 4217 4218 4219
	/* 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 */
4220
		if (cable_is_40wire(ap)) {
4221
			ata_dev_printk(dev, KERN_WARNING,
4222 4223 4224 4225
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4226 4227
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4228 4229 4230 4231 4232 4233
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4234 4235 4236
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4237
 *	LOCKING:
J
Jeff Garzik 已提交
4238
 *	PCI/etc. bus probe sem.
4239 4240 4241
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4242 4243
 */

T
Tejun Heo 已提交
4244
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4245
{
4246
	struct ata_taskfile tf;
4247
	unsigned int err_mask;
L
Linus Torvalds 已提交
4248 4249 4250 4251

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

T
Tejun Heo 已提交
4252 4253 4254
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4255
	ata_tf_init(dev, &tf);
4256 4257
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4258
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4259
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4260
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4261 4262
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4263 4264
	/* 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
4265
		tf.nsect = 0x01;
A
Alan Cox 已提交
4266 4267
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4268

4269
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4270 4271 4272 4273 4274

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4275
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4276 4277
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4278
 *	@feature: The sector count represents the feature to set
4279 4280
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4281
 *	on port @ap with sector count
4282 4283 4284 4285 4286 4287 4288
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4289 4290
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302
{
	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;
4303
	tf.nsect = feature;
4304

4305
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4306

4307 4308
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4309 4310
}

4311 4312 4313
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4314 4315
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4316 4317
 *
 *	LOCKING:
4318 4319 4320 4321
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4322
 */
T
Tejun Heo 已提交
4323 4324
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4325
{
4326
	struct ata_taskfile tf;
4327
	unsigned int err_mask;
4328 4329 4330

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4331
		return AC_ERR_INVALID;
4332 4333 4334 4335

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

T
Tejun Heo 已提交
4336
	ata_tf_init(dev, &tf);
4337 4338 4339 4340 4341
	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 */
4342

4343
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4344 4345 4346 4347 4348
	/* 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;
4349

4350 4351
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4352 4353
}

L
Linus Torvalds 已提交
4354
/**
J
Jeff Garzik 已提交
4355 4356 4357 4358
 *	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
4359 4360
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4361
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4362
 */
4363
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4364 4365
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4366
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4367 4368
	int dir = qc->dma_dir;

4369
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4370

4371
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4372

4373 4374
	if (qc->n_elem)
		dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
L
Linus Torvalds 已提交
4375 4376

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4377
	qc->sg = NULL;
L
Linus Torvalds 已提交
4378 4379 4380
}

/**
4381
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4382 4383
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4384 4385 4386 4387
 *	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
4388
 *	LOCKING:
T
Tejun Heo 已提交
4389 4390 4391 4392 4393
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4394
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4395 4396
{
	struct ata_port *ap = qc->ap;
4397

T
Tejun Heo 已提交
4398 4399 4400 4401 4402
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
	if (unlikely(qc->nbytes & 15))
		return 1;
4403

T
Tejun Heo 已提交
4404 4405
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4406

T
Tejun Heo 已提交
4407 4408
	return 0;
}
L
Linus Torvalds 已提交
4409

T
Tejun Heo 已提交
4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427
/**
 *	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;
4428

T
Tejun Heo 已提交
4429 4430 4431 4432 4433 4434 4435
	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;
	}
4436

T
Tejun Heo 已提交
4437 4438
	return ATA_DEFER_LINK;
}
4439

T
Tejun Heo 已提交
4440
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4441

T
Tejun Heo 已提交
4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461
/**
 *	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;
}
4462

T
Tejun Heo 已提交
4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479
/**
 *	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
4480

T
Tejun Heo 已提交
4481
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4482

T
Tejun Heo 已提交
4483 4484 4485
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4486

T
Tejun Heo 已提交
4487
	DPRINTK("%d sg elements mapped\n", n_elem);
4488

T
Tejun Heo 已提交
4489 4490
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4491

T
Tejun Heo 已提交
4492
	return 0;
L
Linus Torvalds 已提交
4493 4494
}

T
Tejun Heo 已提交
4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507
/**
 *	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)
4508
{
T
Tejun Heo 已提交
4509 4510
#ifdef __BIG_ENDIAN
	unsigned int i;
4511

T
Tejun Heo 已提交
4512 4513 4514
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4515 4516
}

L
Linus Torvalds 已提交
4517 4518 4519 4520 4521 4522
/**
 *	ata_qc_new - Request an available ATA command, for queueing
 *	@ap: Port associated with device @dev
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4523
 *	None.
L
Linus Torvalds 已提交
4524 4525 4526 4527 4528 4529 4530
 */

static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
{
	struct ata_queued_cmd *qc = NULL;
	unsigned int i;

4531
	/* no command while frozen */
4532
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4533 4534
		return NULL;

4535 4536
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4537
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4538
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

/**
 *	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
4553
 *	None.
L
Linus Torvalds 已提交
4554 4555
 */

T
Tejun Heo 已提交
4556
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4557
{
T
Tejun Heo 已提交
4558
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4559 4560 4561 4562 4563 4564 4565 4566
	struct ata_queued_cmd *qc;

	qc = ata_qc_new(ap);
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4567
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580
	}

	return qc;
}

/**
 *	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:
J
Jeff Garzik 已提交
4581
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4582 4583 4584
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4585 4586 4587
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4588
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4589

4590 4591 4592 4593
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4594
		clear_bit(tag, &ap->qc_allocated);
4595
	}
L
Linus Torvalds 已提交
4596 4597
}

4598
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4599
{
4600
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4601
	struct ata_link *link = qc->dev->link;
4602

4603 4604
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4605 4606 4607 4608

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

4609
	/* command should be marked inactive atomically with qc completion */
4610
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4611
		link->sactive &= ~(1 << qc->tag);
4612 4613 4614
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4615
		link->active_tag = ATA_TAG_POISON;
4616 4617 4618 4619 4620 4621 4622
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4623

4624 4625 4626 4627 4628
	/* 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;
4629
	ap->qc_active &= ~(1 << qc->tag);
4630

L
Linus Torvalds 已提交
4631
	/* call completion callback */
4632
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4633 4634
}

4635 4636 4637 4638 4639
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4640
	ap->ops->qc_fill_rtf(qc);
4641 4642
}

4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658
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;
}

4659 4660 4661 4662 4663 4664 4665 4666 4667
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *	@err_mask: ATA Status register contents
 *
 *	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
4668
 *	spin_lock_irqsave(host lock)
4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687
 */
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) {
4688 4689 4690
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4691
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4692 4693 4694 4695 4696 4697 4698

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

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			if (!ata_tag_internal(qc->tag)) {
				/* always fill result TF for failed qc */
4699
				fill_result_tf(qc);
4700 4701 4702 4703 4704 4705 4706
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4707
			fill_result_tf(qc);
4708

4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723
		/* 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;
4724 4725 4726 4727

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4728 4729
		}

4730 4731 4732
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4733 4734 4735 4736 4737 4738 4739
		__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)
4740
			fill_result_tf(qc);
4741 4742 4743 4744 4745

		__ata_qc_complete(qc);
	}
}

4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756
/**
 *	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
4757
 *	spin_lock_irqsave(host lock)
4758 4759 4760 4761
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4762
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790
{
	int nr_done = 0;
	u32 done_mask;
	int i;

	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;
	}

	for (i = 0; i < ATA_MAX_QUEUE; i++) {
		struct ata_queued_cmd *qc;

		if (!(done_mask & (1 << i)))
			continue;

		if ((qc = ata_qc_from_tag(ap, i))) {
			ata_qc_complete(qc);
			nr_done++;
		}
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4791 4792 4793 4794 4795 4796 4797 4798 4799 4800
/**
 *	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
4801
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4802
 */
4803
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4804 4805
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4806
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
4807
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
4808

4809 4810 4811 4812
	/* 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.
	 */
T
Tejun Heo 已提交
4813
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4814

4815
	if (ata_is_ncq(prot)) {
T
Tejun Heo 已提交
4816
		WARN_ON(link->sactive & (1 << qc->tag));
4817 4818 4819

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
4820
		link->sactive |= 1 << qc->tag;
4821
	} else {
T
Tejun Heo 已提交
4822
		WARN_ON(link->sactive);
4823 4824

		ap->nr_active_links++;
T
Tejun Heo 已提交
4825
		link->active_tag = qc->tag;
4826 4827
	}

4828
	qc->flags |= ATA_QCFLAG_ACTIVE;
4829
	ap->qc_active |= 1 << qc->tag;
4830

4831 4832 4833
	/* 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
4834
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
4835

T
Tejun Heo 已提交
4836
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4837
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
4838 4839
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
4840

T
Tejun Heo 已提交
4841
	/* if device is sleeping, schedule reset and abort the link */
4842
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
4843
		link->eh_info.action |= ATA_EH_RESET;
4844 4845 4846 4847 4848
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
4849 4850
	ap->ops->qc_prep(qc);

4851 4852 4853 4854
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4855

4856
sg_err:
4857 4858 4859
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4860 4861
}

4862 4863
/**
 *	sata_scr_valid - test whether SCRs are accessible
4864
 *	@link: ATA link to test SCR accessibility for
4865
 *
4866
 *	Test whether SCRs are accessible for @link.
4867 4868 4869 4870 4871 4872 4873
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
4874
int sata_scr_valid(struct ata_link *link)
4875
{
4876 4877
	struct ata_port *ap = link->ap;

4878
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
4879 4880 4881 4882
}

/**
 *	sata_scr_read - read SCR register of the specified port
4883
 *	@link: ATA link to read SCR for
4884 4885 4886
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
4887
 *	Read SCR register @reg of @link into *@val.  This function is
4888 4889
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
4890 4891
 *
 *	LOCKING:
4892
 *	None if @link is ap->link.  Kernel thread context otherwise.
4893 4894 4895 4896
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
4897
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
4898
{
4899 4900
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
4901
			return link->ap->ops->scr_read(link, reg, val);
4902 4903 4904 4905
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
4906 4907 4908 4909
}

/**
 *	sata_scr_write - write SCR register of the specified port
4910
 *	@link: ATA link to write SCR for
4911 4912 4913
 *	@reg: SCR to write
 *	@val: value to write
 *
4914
 *	Write @val to SCR register @reg of @link.  This function is
4915 4916
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
4917 4918
 *
 *	LOCKING:
4919
 *	None if @link is ap->link.  Kernel thread context otherwise.
4920 4921 4922 4923
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
4924
int sata_scr_write(struct ata_link *link, int reg, u32 val)
4925
{
4926 4927
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
4928
			return link->ap->ops->scr_write(link, reg, val);
4929 4930
		return -EOPNOTSUPP;
	}
4931

4932
	return sata_pmp_scr_write(link, reg, val);
4933 4934 4935 4936
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
4937
 *	@link: ATA link to write SCR for
4938 4939 4940 4941 4942 4943 4944
 *	@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:
4945
 *	None if @link is ap->link.  Kernel thread context otherwise.
4946 4947 4948 4949
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
4950
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
4951
{
4952 4953
	if (ata_is_host_link(link)) {
		int rc;
4954

4955
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
4956
			rc = link->ap->ops->scr_write(link, reg, val);
4957
			if (rc == 0)
T
Tejun Heo 已提交
4958
				rc = link->ap->ops->scr_read(link, reg, &val);
4959 4960 4961
			return rc;
		}
		return -EOPNOTSUPP;
4962
	}
4963 4964

	return sata_pmp_scr_write(link, reg, val);
4965 4966 4967
}

/**
4968 4969
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
4970
 *
4971 4972 4973
 *	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).
4974 4975 4976 4977 4978 4979 4980
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
4981
int ata_link_online(struct ata_link *link)
4982 4983 4984
{
	u32 sstatus;

4985 4986
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
4987 4988 4989 4990 4991
		return 1;
	return 0;
}

/**
4992 4993
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
4994
 *
4995 4996 4997
 *	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).
4998 4999 5000 5001 5002 5003 5004
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
5005
int ata_link_offline(struct ata_link *link)
5006 5007 5008
{
	u32 sstatus;

5009 5010
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
5011 5012 5013
		return 1;
	return 0;
}
E
Edward Falk 已提交
5014

5015
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5016 5017 5018
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5019 5020 5021 5022
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5023 5024
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5025
		struct ata_link *link;
5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044

		/* 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;
5045 5046 5047 5048
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066

		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
5067 5068
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5069 5070
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5071
 *	Suspend @host.  Actual operation is performed by EH.  This
5072 5073 5074 5075 5076 5077 5078 5079 5080
 *	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
5081
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5082
{
5083
	int rc;
5084

5085 5086 5087 5088 5089 5090
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5091
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5092 5093
	if (rc == 0)
		host->dev->power.power_state = mesg;
5094 5095 5096 5097
	return rc;
}

/**
J
Jeff Garzik 已提交
5098 5099
 *	ata_host_resume - resume host
 *	@host: host to resume
5100
 *
J
Jeff Garzik 已提交
5101
 *	Resume @host.  Actual operation is performed by EH.  This
5102 5103 5104 5105 5106 5107
 *	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
5108
void ata_host_resume(struct ata_host *host)
5109
{
T
Tejun Heo 已提交
5110
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5111
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5112
	host->dev->power.power_state = PMSG_ON;
5113 5114 5115

	/* reenable link pm */
	ata_lpm_disable(host);
5116
}
5117
#endif
5118

5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130
/**
 *	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.
 */
5131
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5132
{
5133
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5134

5135 5136
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5137 5138 5139 5140 5141 5142
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153
/**
 *	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
5154 5155
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
5156 5157
	unsigned long flags;

5158
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
5159 5160
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5161

5162 5163
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5164
	 * host lock.
5165
	 */
5166
	spin_lock_irqsave(ap->lock, flags);
5167
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5168
	dev->horkage = 0;
5169
	spin_unlock_irqrestore(ap->lock, flags);
5170

5171 5172
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5173 5174 5175 5176 5177
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5178 5179 5180 5181
/**
 *	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
5182
 *	@pmp: Port multiplier port number
5183 5184 5185 5186 5187 5188
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5189
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5190 5191 5192 5193 5194 5195 5196
{
	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
5197
	link->pmp = pmp;
5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

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

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

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
5224
int sata_link_init_spd(struct ata_link *link)
5225
{
5226
	u8 spd;
5227 5228
	int rc;

T
Tejun Heo 已提交
5229
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5230 5231 5232
	if (rc)
		return rc;

T
Tejun Heo 已提交
5233
	spd = (link->saved_scontrol >> 4) & 0xf;
5234 5235 5236
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5237
	ata_force_link_limits(link);
5238

5239 5240 5241 5242 5243
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5244
/**
5245 5246
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5247
 *
5248 5249 5250 5251
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5252
 *
L
Linus Torvalds 已提交
5253
 *	LOCKING:
5254
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5255
 */
5256
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5257
{
5258
	struct ata_port *ap;
L
Linus Torvalds 已提交
5259

5260 5261 5262 5263 5264 5265
	DPRINTK("ENTER\n");

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

5266
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5267
	ap->lock = &host->lock;
5268
	ap->flags = ATA_FLAG_DISABLED;
5269
	ap->print_id = -1;
L
Linus Torvalds 已提交
5270
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5271
	ap->host = host;
5272
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5273
	ap->last_ctl = 0xFF;
5274 5275 5276 5277 5278 5279

#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
5280
#else
5281
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5282
#endif
L
Linus Torvalds 已提交
5283

T
Tejun Heo 已提交
5284
#ifdef CONFIG_ATA_SFF
5285
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
T
Tejun Heo 已提交
5286
#endif
5287 5288
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5289
	INIT_LIST_HEAD(&ap->eh_done_q);
5290
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
5291 5292 5293
	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
5294

5295 5296
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5297
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5298 5299 5300 5301 5302 5303 5304 5305

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

5306 5307 5308 5309 5310
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5311 5312 5313
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5314 5315 5316 5317
		if (!ap)
			continue;

		if (ap->scsi_host)
5318 5319
			scsi_host_put(ap->scsi_host);

5320
		kfree(ap->pmp_link);
5321
		kfree(ap);
5322 5323 5324
		host->ports[i] = NULL;
	}

5325
	dev_set_drvdata(gendev, NULL);
5326 5327
}

5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392
/**
 *	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;
}

5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430
/**
 *	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;
5431
		ap->link.flags |= pi->link_flags;
5432 5433 5434 5435 5436 5437 5438 5439 5440
		ap->ops = pi->port_ops;

		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
			host->ops = pi->port_ops;
	}

	return host;
}

5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458
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);
}

5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480
/**
 *	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)
{
5481
	static DEFINE_SPINLOCK(lock);
5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508
	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);
}

5509 5510 5511 5512 5513 5514 5515
/**
 *	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
5516 5517
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5518 5519 5520 5521 5522 5523 5524 5525 5526
 *
 *	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)
{
5527 5528
	int have_stop = 0;
	void *start_dr = NULL;
5529 5530 5531 5532 5533
	int i, rc;

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

5534 5535
	ata_finalize_port_ops(host->ops);

5536 5537 5538
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5539 5540
		ata_finalize_port_ops(ap->ops);

5541 5542 5543
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559
		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];

5560 5561 5562
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5563
				if (rc != -ENODEV)
A
Andrew Morton 已提交
5564 5565 5566
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
5567 5568 5569 5570 5571 5572
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5573 5574
	if (start_dr)
		devres_add(host->dev, start_dr);
5575 5576 5577 5578 5579 5580 5581 5582 5583 5584
	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);
	}
5585
	devres_free(start_dr);
5586 5587 5588
	return rc;
}

5589
/**
J
Jeff Garzik 已提交
5590 5591 5592 5593 5594
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5595 5596 5597 5598 5599
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5600
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5601
void ata_host_init(struct ata_host *host, struct device *dev,
5602
		   unsigned long flags, struct ata_port_operations *ops)
5603
{
J
Jeff Garzik 已提交
5604 5605 5606 5607
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5608 5609
}

5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652
/**
 *	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;

5653 5654 5655
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

5656 5657 5658 5659 5660 5661 5662 5663 5664 5665
	/* 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 */
5666
		sata_link_init_spd(&ap->link);
5667

5668
		/* print per-port info to dmesg */
5669 5670 5671
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

5672
		if (!ata_port_is_dummy(ap)) {
5673 5674
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
5675
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5676
					ata_mode_string(xfer_mask),
5677
					ap->link.eh_info.desc);
5678 5679
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
5680 5681 5682 5683 5684 5685 5686 5687 5688 5689
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		/* probe */
		if (ap->ops->error_handler) {
T
Tejun Heo 已提交
5690
			struct ata_eh_info *ehi = &ap->link.eh_info;
5691 5692 5693 5694 5695 5696 5697
			unsigned long flags;

			ata_port_probe(ap);

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

5698
			ehi->probe_mask |= ATA_ALL_DEVICES;
5699
			ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
5700 5701
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

5702
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730
			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.
				 */
			}
		}
	}

	/* probes are done, now scan each port's disk(s) */
	DPRINTK("host probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5731
		ata_scsi_scan_host(ap, 1);
5732 5733 5734 5735 5736
	}

	return 0;
}

5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749
/**
 *	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.
 *
5750 5751 5752 5753
 *	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.
 *
5754 5755 5756 5757 5758 5759 5760 5761 5762 5763
 *	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)
{
5764
	int i, rc;
5765 5766 5767 5768 5769

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

5770 5771 5772 5773 5774 5775
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

5776 5777 5778 5779 5780
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

5781 5782
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
5783

5784 5785 5786 5787 5788 5789 5790 5791
	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;
}

5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802
/**
 *	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).
 */
5803
static void ata_port_detach(struct ata_port *ap)
5804 5805
{
	unsigned long flags;
5806
	struct ata_link *link;
5807
	struct ata_device *dev;
5808 5809

	if (!ap->ops->error_handler)
5810
		goto skip_eh;
5811 5812

	/* tell EH we're leaving & flush EH */
5813
	spin_lock_irqsave(ap->lock, flags);
5814
	ap->pflags |= ATA_PFLAG_UNLOADING;
5815
	spin_unlock_irqrestore(ap->lock, flags);
5816 5817 5818

	ata_port_wait_eh(ap);

5819
	/* EH is now guaranteed to see UNLOADING - EH context belongs
T
Tejun Heo 已提交
5820
	 * to us.  Restore SControl and disable all existing devices.
5821
	 */
T
Tejun Heo 已提交
5822 5823
	__ata_port_for_each_link(link, ap) {
		sata_scr_write(link, SCR_CONTROL, link->saved_scontrol);
5824 5825 5826
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
5827 5828 5829 5830 5831

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5832
	spin_lock_irqsave(ap->lock, flags);
5833
	ata_port_freeze(ap);	/* won't be thawed */
5834
	spin_unlock_irqrestore(ap->lock, flags);
5835 5836

	ata_port_wait_eh(ap);
5837
	cancel_rearming_delayed_work(&ap->hotplug_task);
5838

5839
 skip_eh:
5840
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5841
	scsi_remove_host(ap->scsi_host);
5842 5843
}

T
Tejun Heo 已提交
5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858
/**
 *	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]);
5859 5860 5861

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
5862 5863
}

5864 5865
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
5866 5867 5868 5869
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
5870 5871 5872
 *	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
5873 5874 5875 5876
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
5877
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
5878
{
5879
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
5880
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
5881

T
Tejun Heo 已提交
5882
	ata_host_detach(host);
L
Linus Torvalds 已提交
5883 5884 5885
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
5886
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917
{
	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
5918

5919
#ifdef CONFIG_PM
5920
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
5921 5922
{
	pci_save_state(pdev);
5923
	pci_disable_device(pdev);
5924

5925
	if (mesg.event & PM_EVENT_SLEEP)
5926
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
5927 5928
}

5929
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
5930
{
5931 5932
	int rc;

J
Jens Axboe 已提交
5933 5934
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
5935

T
Tejun Heo 已提交
5936
	rc = pcim_enable_device(pdev);
5937 5938 5939 5940 5941 5942
	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
5943
	pci_set_master(pdev);
5944
	return 0;
5945 5946
}

5947
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
5948
{
J
Jeff Garzik 已提交
5949
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
5950 5951
	int rc = 0;

J
Jeff Garzik 已提交
5952
	rc = ata_host_suspend(host, mesg);
5953 5954 5955
	if (rc)
		return rc;

5956
	ata_pci_device_do_suspend(pdev, mesg);
5957 5958 5959 5960 5961 5962

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
5963
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
5964
	int rc;
5965

5966 5967 5968 5969
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
5970
}
5971 5972
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
5973 5974
#endif /* CONFIG_PCI */

5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028
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) },
6029 6030 6031
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 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 6120 6121 6122 6123 6124 6125 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
	};
	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
6152 6153 6154

static int __init ata_init(void)
{
6155 6156
	ata_parse_force_param();

L
Linus Torvalds 已提交
6157 6158
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
6159
		goto free_force_tbl;
L
Linus Torvalds 已提交
6160

6161
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
6162 6163
	if (!ata_aux_wq)
		goto free_wq;
6164

L
Linus Torvalds 已提交
6165 6166
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6167 6168 6169 6170 6171 6172

free_wq:
	destroy_workqueue(ata_wq);
free_force_tbl:
	kfree(ata_force_tbl);
	return -ENOMEM;
L
Linus Torvalds 已提交
6173 6174 6175 6176
}

static void __exit ata_exit(void)
{
6177
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6178
	destroy_workqueue(ata_wq);
6179
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6180 6181
}

6182
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6183 6184
module_exit(ata_exit);

6185
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6186
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205

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;
}

6206 6207 6208 6209 6210
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6211 6212
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229
 *
 *	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,
6230
		      unsigned long interval, unsigned long timeout)
6231
{
6232
	unsigned long deadline;
6233 6234 6235 6236 6237 6238 6239 6240
	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.
	 */
6241
	deadline = ata_deadline(jiffies, timeout);
6242

6243 6244
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
		msleep(interval);
6245 6246 6247 6248 6249 6250
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6251 6252 6253
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6254
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6255
{
T
Tejun Heo 已提交
6256
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6257 6258
}

T
Tejun Heo 已提交
6259
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6260
{
T
Tejun Heo 已提交
6261
	/* truly dummy */
T
Tejun Heo 已提交
6262 6263
}

6264
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6265 6266
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6267
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6268 6269
};

6270 6271 6272 6273
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6274 6275 6276 6277 6278 6279
/*
 * 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.
 */
6280 6281 6282
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6283 6284
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6285
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6286
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6287
EXPORT_SYMBOL_GPL(__ata_port_next_link);
L
Linus Torvalds 已提交
6288
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6289
EXPORT_SYMBOL_GPL(ata_host_init);
6290
EXPORT_SYMBOL_GPL(ata_host_alloc);
6291
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6292
EXPORT_SYMBOL_GPL(ata_host_start);
6293
EXPORT_SYMBOL_GPL(ata_host_register);
6294
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6295
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6296
EXPORT_SYMBOL_GPL(ata_sg_init);
6297
EXPORT_SYMBOL_GPL(ata_qc_complete);
6298
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6299
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6300 6301
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6302 6303 6304 6305 6306 6307 6308
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
6309
EXPORT_SYMBOL_GPL(ata_port_start);
6310
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6311
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6312
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6313
EXPORT_SYMBOL_GPL(ata_port_probe);
6314
EXPORT_SYMBOL_GPL(ata_dev_disable);
6315
EXPORT_SYMBOL_GPL(sata_set_spd);
6316
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6317 6318
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6319
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6320
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6321
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6322
EXPORT_SYMBOL_GPL(ata_std_postreset);
6323 6324
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6325
EXPORT_SYMBOL_GPL(ata_port_disable);
6326
EXPORT_SYMBOL_GPL(ata_ratelimit);
6327
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6328 6329 6330
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6331
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6332
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6333 6334 6335 6336
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);
6337 6338
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6339
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6340 6341
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6342
#endif /* CONFIG_PM */
6343 6344
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6345
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6346 6347
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6348
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6349
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6350 6351
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6352
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6353

L
Linus Torvalds 已提交
6354 6355 6356
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6357
#ifdef CONFIG_PM
6358 6359
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6360 6361
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6362
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6363
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6364

T
Tejun Heo 已提交
6365 6366 6367
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6368 6369 6370 6371
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6372
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6373
EXPORT_SYMBOL_GPL(ata_link_abort);
6374
EXPORT_SYMBOL_GPL(ata_port_abort);
6375
EXPORT_SYMBOL_GPL(ata_port_freeze);
6376
EXPORT_SYMBOL_GPL(sata_async_notification);
6377 6378
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6379 6380
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6381
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6382
EXPORT_SYMBOL_GPL(ata_do_eh);
6383
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6384 6385 6386 6387

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6388
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6389
EXPORT_SYMBOL_GPL(ata_cable_sata);