libata-core.c 157.8 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/jiffies.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;
};

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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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 = ATA_TMOUT_INTERNAL / HZ;
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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/**
 *	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;
	}
}

/**
 *	ata_force_spd_limit - force SATA spd limit according to libata.force
 *	@link: ATA link of interest
 *
 *	Force 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.
 *
 *	LOCKING:
 *	EH context.
 */
static void ata_force_spd_limit(struct ata_link *link)
{
	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;

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

		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);
		return;
	}
}

/**
 *	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;
}

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

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	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
		/* 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;
}

687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
/**
 *	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.
 */
702 703 704
unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
705 706 707 708 709 710
{
	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);
}

711 712 713 714 715 716 717 718 719 720
/**
 *	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.
 */
721 722
void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
723 724 725 726 727 728 729 730 731
{
	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;
}

732
static const struct ata_xfer_ent {
733
	int shift, bits;
734 735
	u8 base;
} ata_xfer_tbl[] = {
736 737 738
	{ 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 },
739 740 741 742 743 744 745 746 747 748 749 750 751 752
	{ -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:
753
 *	Matching XFER_* value, 0xff if no match found.
754
 */
755
u8 ata_xfer_mask2mode(unsigned long xfer_mask)
756 757 758 759 760 761 762
{
	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;
763
	return 0xff;
764 765 766 767 768 769 770 771 772 773 774 775 776 777
}

/**
 *	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.
 */
778
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
779 780 781 782 783
{
	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)
784 785
			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
	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.
 */
801
int ata_xfer_mode2shift(unsigned long xfer_mode)
802 803 804 805 806 807 808 809 810
{
	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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811
/**
812 813
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
L
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814 815
 *
 *	Determine string which represents the highest speed
816
 *	(highest bit in @modemask).
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817 818 819 820 821 822
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
823
 *	@mode_mask, or the constant C string "<n/a>".
L
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824
 */
825
const char *ata_mode_string(unsigned long xfer_mask)
L
Linus Torvalds 已提交
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{
827 828 829 830 831 832
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
833 834
		"PIO5",
		"PIO6",
835 836 837
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
838 839
		"MWDMA3",
		"MWDMA4",
840 841 842 843 844 845 846 847 848
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
849
	int highbit;
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Linus Torvalds 已提交
850

851 852 853
	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
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854 855 856
	return "<n/a>";
}

857 858 859 860 861 862 863 864 865 866 867 868
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)
870
{
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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");
874
		ata_acpi_on_disable(dev);
875 876
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
877 878 879 880
		dev->class++;
	}
}

881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
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;

937 938 939 940 941
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
942 943 944 945 946 947 948 949 950
		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;

951 952 953 954 955
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
956 957 958 959 960 961 962 963 964 965 966
		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
967 968
 *	@dev:  device to enable power management
 *	@policy: the link power management policy
969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997
 *
 *	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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998
#ifdef CONFIG_PM
999 1000
/**
 *	ata_dev_disable_pm - disable SATA interface power management
S
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1001
 *	@dev: device to disable power management
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
 *
 *	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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1019
#endif	/* CONFIG_PM */
1020 1021 1022 1023

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
1024
	ap->link.eh_info.action |= ATA_EH_LPM;
1025 1026 1027 1028
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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1029
#ifdef CONFIG_PM
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
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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1055
#endif	/* CONFIG_PM */
1056

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1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
/**
 *	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:
1069 1070
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
L
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 */
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1072
unsigned int ata_dev_classify(const struct ata_taskfile *tf)
L
Linus Torvalds 已提交
1073 1074 1075 1076
{
	/* 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.
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
	 *
	 * 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
Linus Torvalds 已提交
1091
	 */
1092
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
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1093 1094 1095 1096
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

1097
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
L
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1098 1099 1100 1101
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

1102 1103 1104 1105 1106 1107
	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)) {
1108
		printk(KERN_INFO "ata: SEMB device ignored\n");
1109 1110 1111
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

L
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1112 1113 1114 1115 1116
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
1117
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
L
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1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
 *	@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.
 */

1131 1132
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

1150
/**
1151
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1152 1153 1154 1155 1156
 *	@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.
 *
1157
 *	This function is identical to ata_id_string except that it
1158 1159 1160 1161 1162 1163
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1164 1165
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1166 1167 1168 1169 1170
{
	unsigned char *p;

	WARN_ON(!(len & 1));

1171
	ata_id_string(id, s, ofs, len - 1);
1172 1173 1174 1175 1176 1177

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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Tejun Heo 已提交
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
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];
	}
}

1194
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
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1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
{
	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);

1205
	return sectors;
A
Alan Cox 已提交
1206 1207
}

1208
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1209 1210 1211 1212 1213 1214 1215 1216
{
	u64 sectors = 0;

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

1217
	return sectors;
A
Alan Cox 已提交
1218 1219 1220
}

/**
1221 1222 1223
 *	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
1224
 *
1225 1226
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
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1227
 *
1228 1229 1230
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
Alan Cox 已提交
1231
 */
1232
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1233
{
1234
	unsigned int err_mask;
A
Alan Cox 已提交
1235
	struct ata_taskfile tf;
1236
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1237 1238 1239

	ata_tf_init(dev, &tf);

1240
	/* always clear all address registers */
A
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1241 1242
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1243 1244 1245 1246 1247
	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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1248 1249

	tf.protocol |= ATA_PROT_NODATA;
1250 1251
	tf.device |= ATA_LBA;

1252
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1253 1254 1255 1256 1257 1258 1259
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
A
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1260

1261
	if (lba48)
1262
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1263
	else
1264
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1265
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1266
		(*max_sectors)--;
1267
	return 0;
A
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1268 1269 1270
}

/**
1271 1272
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1273
 *	@new_sectors: new max sectors value to set for the device
A
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1274
 *
1275 1276 1277 1278 1279 1280
 *	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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1281
 */
T
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1282
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1283
{
1284
	unsigned int err_mask;
A
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1285
	struct ata_taskfile tf;
1286
	int lba48 = ata_id_has_lba48(dev->id);
A
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1287 1288 1289 1290 1291 1292

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1293 1294 1295 1296 1297 1298 1299 1300

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

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
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1301
	} else {
1302 1303
		tf.command = ATA_CMD_SET_MAX;

T
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1304 1305 1306
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1307
	tf.protocol |= ATA_PROT_NODATA;
1308
	tf.device |= ATA_LBA;
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1309 1310 1311 1312 1313

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

1314
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
	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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1325 1326 1327 1328 1329 1330 1331 1332 1333
}

/**
 *	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
1334 1335 1336
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
Alan Cox 已提交
1337
 */
T
Tejun Heo 已提交
1338
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1339
{
T
Tejun Heo 已提交
1340 1341 1342 1343
	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;
1344
	int rc;
J
Jeff Garzik 已提交
1345

T
Tejun Heo 已提交
1346 1347 1348 1349
	/* 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))
1350
		return 0;
A
Alan Cox 已提交
1351

T
Tejun Heo 已提交
1352 1353 1354
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
Tejun Heo 已提交
1355 1356
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1357
		 */
T
Tejun Heo 已提交
1358
		if (rc == -EACCES || !ata_ignore_hpa) {
T
Tejun Heo 已提交
1359
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
T
Tejun Heo 已提交
1360
				       "broken, skipping HPA handling\n");
T
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1361 1362 1363 1364 1365
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
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1366
		}
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1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
		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
1421 1422
}

L
Linus Torvalds 已提交
1423 1424
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1425
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1426
 *
1427 1428
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1429 1430 1431 1432 1433
 *
 *	LOCKING:
 *	caller.
 */

1434
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1435 1436 1437 1438 1439 1440
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1441 1442 1443 1444 1445
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1446 1447 1448 1449 1450
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1451 1452 1453 1454 1455
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1456 1457
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1458 1459
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1460 1461
}

1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
/**
 *	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
 */
1477
unsigned long ata_id_xfermask(const u16 *id)
1478
{
1479
	unsigned long pio_mask, mwdma_mask, udma_mask;
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490

	/* 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.
		 */
1491
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1492
		if (mode < 5)	/* Valid PIO range */
1493
			pio_mask = (2 << mode) - 1;
1494 1495
		else
			pio_mask = 1;
1496 1497 1498 1499 1500 1501 1502 1503 1504 1505

		/* 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;
1506

1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
	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);
	}

1524 1525 1526
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1527 1528 1529 1530

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1531
/**
1532
 *	ata_pio_queue_task - Queue port_task
T
Tejun Heo 已提交
1533
 *	@ap: The ata_port to queue port_task for
1534
 *	@fn: workqueue function to be scheduled
1535
 *	@data: data for @fn to use
1536
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1537 1538 1539 1540 1541 1542 1543
 *
 *	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
1544
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
T
Tejun Heo 已提交
1545 1546 1547 1548 1549
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
1550
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
T
Tejun Heo 已提交
1551
{
1552
	ap->port_task_data = data;
T
Tejun Heo 已提交
1553

1554 1555
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571
}

/**
 *	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");

1572
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1573

1574
	if (ata_msg_ctl(ap))
1575
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
T
Tejun Heo 已提交
1576 1577
}

1578
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1579
{
1580
	struct completion *waiting = qc->private_data;
1581 1582 1583 1584 1585

	complete(waiting);
}

/**
1586
 *	ata_exec_internal_sg - execute libata internal command
1587 1588
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1589
 *	@cdb: CDB for packet command
1590
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1591
 *	@sgl: sg list for the data buffer of the command
1592
 *	@n_elem: Number of sg entries
1593
 *	@timeout: Timeout in msecs (0 for default)
1594 1595 1596 1597 1598 1599 1600 1601 1602
 *
 *	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.
1603 1604 1605
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1606
 */
1607 1608
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1609
			      int dma_dir, struct scatterlist *sgl,
1610
			      unsigned int n_elem, unsigned long timeout)
1611
{
T
Tejun Heo 已提交
1612 1613
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1614 1615
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1616
	unsigned int tag, preempted_tag;
1617
	u32 preempted_sactive, preempted_qc_active;
1618
	int preempted_nr_active_links;
1619
	DECLARE_COMPLETION_ONSTACK(wait);
1620
	unsigned long flags;
1621
	unsigned int err_mask;
1622
	int rc;
1623

1624
	spin_lock_irqsave(ap->lock, flags);
1625

1626
	/* no internal command while frozen */
1627
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1628
		spin_unlock_irqrestore(ap->lock, flags);
1629 1630 1631
		return AC_ERR_SYSTEM;
	}

1632
	/* initialize internal qc */
1633

1634 1635 1636 1637 1638 1639 1640 1641 1642 1643
	/* 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;

1644
	if (test_and_set_bit(tag, &ap->qc_allocated))
1645
		BUG();
1646
	qc = __ata_qc_from_tag(ap, tag);
1647 1648 1649 1650 1651 1652 1653

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

T
Tejun Heo 已提交
1654 1655
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1656
	preempted_qc_active = ap->qc_active;
1657
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1658 1659
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1660
	ap->qc_active = 0;
1661
	ap->nr_active_links = 0;
1662 1663

	/* prepare & issue qc */
1664
	qc->tf = *tf;
1665 1666
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1667
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1668 1669
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1670
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1671
		struct scatterlist *sg;
1672

J
Jens Axboe 已提交
1673 1674
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1675

J
Jens Axboe 已提交
1676
		ata_sg_init(qc, sgl, n_elem);
1677
		qc->nbytes = buflen;
1678 1679
	}

1680
	qc->private_data = &wait;
1681 1682
	qc->complete_fn = ata_qc_complete_internal;

1683
	ata_qc_issue(qc);
1684

1685
	spin_unlock_irqrestore(ap->lock, flags);
1686

1687 1688 1689 1690
	if (!timeout)
		timeout = ata_probe_timeout * 1000 / HZ;

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1691 1692

	ata_port_flush_task(ap);
1693

1694
	if (!rc) {
1695
		spin_lock_irqsave(ap->lock, flags);
1696 1697 1698

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1699 1700
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1701
		 */
1702
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1703 1704 1705 1706 1707 1708
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1709

1710 1711
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1712
					"qc timeout (cmd 0x%x)\n", command);
1713 1714
		}

1715
		spin_unlock_irqrestore(ap->lock, flags);
1716 1717
	}

1718 1719 1720 1721
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1722 1723 1724 1725 1726 1727 1728 1729 1730 1731
	/* 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;
1732 1733
	}

1734
	/* finish up */
1735
	spin_lock_irqsave(ap->lock, flags);
1736

1737
	*tf = qc->result_tf;
1738 1739 1740
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1741 1742
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1743
	ap->qc_active = preempted_qc_active;
1744
	ap->nr_active_links = preempted_nr_active_links;
1745

1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756
	/* 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.
	 */
1757
	if (ap->flags & ATA_FLAG_DISABLED) {
1758 1759 1760 1761
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

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

1764
	return err_mask;
1765 1766
}

1767
/**
1768
 *	ata_exec_internal - execute libata internal command
1769 1770 1771 1772 1773 1774
 *	@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
1775
 *	@timeout: Timeout in msecs (0 for default)
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
 *
 *	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,
1788 1789
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1790
{
1791 1792
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1793

1794 1795 1796 1797 1798 1799
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1800

1801 1802
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1803 1804
}

1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817
/**
 *	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
1818
 */
1819
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1820 1821 1822 1823 1824 1825 1826 1827 1828
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1829
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1830 1831
}

1832 1833 1834 1835 1836 1837 1838
/**
 *	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
1839

1840 1841
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1842 1843
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1844
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1845
		return 0;
A
Alan Cox 已提交
1846 1847 1848 1849 1850
	/* 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))
1851
		return 1;
A
Alan Cox 已提交
1852 1853
	return 0;
}
1854

A
Alan Cox 已提交
1855 1856 1857 1858 1859 1860 1861
/**
 *	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
1862

A
Alan Cox 已提交
1863 1864
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1865 1866
	/* 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
1867
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1868 1869 1870 1871
		/* 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
1872 1873
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1874 1875
		}
	}
A
Alan Cox 已提交
1876
	return 3 << ATA_SHIFT_PIO;
1877 1878
}

L
Linus Torvalds 已提交
1879
/**
1880 1881 1882
 *	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)
1883
 *	@flags: ATA_READID_* flags
1884
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1885
 *
1886 1887
 *	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
1888 1889
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1890
 *
1891
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1892
 *	now we abort if we hit that case.
1893
 *
L
Linus Torvalds 已提交
1894
 *	LOCKING:
1895 1896 1897 1898
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1899
 */
1900
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1901
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1902
{
T
Tejun Heo 已提交
1903
	struct ata_port *ap = dev->link->ap;
1904
	unsigned int class = *p_class;
1905
	struct ata_taskfile tf;
1906 1907
	unsigned int err_mask = 0;
	const char *reason;
1908
	int may_fallback = 1, tried_spinup = 0;
1909
	int rc;
L
Linus Torvalds 已提交
1910

1911
	if (ata_msg_ctl(ap))
1912
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
1913

1914
 retry:
T
Tejun Heo 已提交
1915
	ata_tf_init(dev, &tf);
1916

1917 1918
	switch (class) {
	case ATA_DEV_ATA:
1919
		tf.command = ATA_CMD_ID_ATA;
1920 1921
		break;
	case ATA_DEV_ATAPI:
1922
		tf.command = ATA_CMD_ID_ATAPI;
1923 1924 1925 1926 1927
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1928 1929
	}

1930
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940

	/* 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
1941

T
Tejun Heo 已提交
1942
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1943
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1944
	if (err_mask) {
1945
		if (err_mask & AC_ERR_NODEV_HINT) {
1946 1947
			ata_dev_printk(dev, KERN_DEBUG,
				       "NODEV after polling detection\n");
1948 1949 1950
			return -ENOENT;
		}

1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973
		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;
1974 1975
		}

1976 1977
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1978 1979 1980
		goto err_out;
	}

1981 1982 1983 1984 1985
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1986
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1987

1988
	/* sanity check */
1989
	rc = -EINVAL;
A
Alan Cox 已提交
1990
	reason = "device reports invalid type";
1991 1992 1993 1994 1995 1996 1997

	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;
1998 1999
	}

2000 2001 2002 2003 2004 2005 2006
	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.
		 */
2007
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2008
		if (err_mask && id[2] != 0x738c) {
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
			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;
	}

2021
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2022 2023 2024
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2025 2026
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2027 2028
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2029 2030 2031
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
2032 2033
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2034
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2035 2036 2037 2038 2039 2040 2041 2042 2043
			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.
			 */
2044
			flags &= ~ATA_READID_POSTRESET;
2045 2046 2047 2048 2049
			goto retry;
		}
	}

	*p_class = class;
2050

2051 2052 2053
	return 0;

 err_out:
T
Tejun Heo 已提交
2054
	if (ata_msg_warn(ap))
2055
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
2056
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2057 2058 2059
	return rc;
}

T
Tejun Heo 已提交
2060
static inline u8 ata_dev_knobble(struct ata_device *dev)
2061
{
T
Tejun Heo 已提交
2062 2063
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2064 2065
}

2066 2067 2068
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2069
	struct ata_port *ap = dev->link->ap;
2070 2071 2072 2073 2074 2075
	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
2076
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2077 2078 2079
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2080
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2081
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2082 2083 2084 2085 2086 2087 2088 2089 2090
		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);
}

2091
/**
2092 2093 2094 2095 2096
 *	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.
2097 2098
 *
 *	LOCKING:
2099 2100 2101 2102
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2103
 */
2104
int ata_dev_configure(struct ata_device *dev)
2105
{
T
Tejun Heo 已提交
2106 2107
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2108
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2109
	const u16 *id = dev->id;
2110
	unsigned long xfer_mask;
2111
	char revbuf[7];		/* XYZ-99\0 */
2112 2113
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2114
	int rc;
2115

2116
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2117
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
2118
			       __func__);
2119
		return 0;
2120 2121
	}

2122
	if (ata_msg_probe(ap))
2123
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2124

T
Tejun Heo 已提交
2125 2126
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2127
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2128

T
Tejun Heo 已提交
2129 2130 2131 2132
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2133

T
Tejun Heo 已提交
2134 2135 2136 2137 2138
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2139
	/* print device capabilities */
2140
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2141 2142 2143
		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",
2144
			       __func__,
2145 2146
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2147

2148
	/* initialize to-be-configured parameters */
2149
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2150 2151 2152 2153 2154 2155 2156
	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
2157 2158 2159 2160
	/*
	 * common ATA, ATAPI feature tests
	 */

2161
	/* find max transfer mode; for printk only */
2162
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2163

2164 2165
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2166

2167 2168 2169 2170 2171 2172 2173
	/* 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
2174 2175
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2176 2177
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
2178 2179 2180
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2181
			snprintf(revbuf, 7, "CFA");
2182
		} else {
2183
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2184 2185 2186 2187 2188 2189
			/* 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");
		}
2190

2191
		dev->n_sectors = ata_id_n_sectors(id);
2192

2193 2194 2195
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

2196
		if (ata_id_has_lba(id)) {
2197
			const char *lba_desc;
2198
			char ncq_desc[20];
2199

2200 2201
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2202
			if (ata_id_has_lba48(id)) {
2203
				dev->flags |= ATA_DFLAG_LBA48;
2204
				lba_desc = "LBA48";
2205 2206 2207 2208

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2209
			}
2210

2211 2212 2213
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2214
			/* print device info to dmesg */
2215 2216 2217 2218 2219 2220 2221
			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",
2222
					(unsigned long long)dev->n_sectors,
2223 2224
					dev->multi_count, lba_desc, ncq_desc);
			}
2225
		} else {
2226 2227 2228
			/* CHS */

			/* Default translation */
2229 2230 2231
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2232

2233
			if (ata_id_current_chs_valid(id)) {
2234
				/* Current CHS translation is valid. */
2235 2236 2237
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2238 2239 2240
			}

			/* print device info to dmesg */
2241
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2242
				ata_dev_printk(dev, KERN_INFO,
2243 2244 2245
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2246
				ata_dev_printk(dev, KERN_INFO,
2247 2248 2249 2250 2251
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2252 2253
		}

2254
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2255 2256 2257
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2258
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2259 2260
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2261
		const char *dma_dir_string = "";
2262
		u32 sntf;
2263

2264
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2265
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2266
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2267 2268
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2269
			rc = -EINVAL;
L
Linus Torvalds 已提交
2270 2271
			goto err_out_nosup;
		}
2272
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2273

2274 2275 2276 2277
		/* 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.
2278
		 */
2279
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2280
		    (!sata_pmp_attached(ap) ||
2281
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2282 2283
			unsigned int err_mask;

2284
			/* issue SET feature command to turn this on */
2285 2286
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2287
			if (err_mask)
2288
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2289 2290 2291
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2292
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2293 2294
				atapi_an_string = ", ATAPI AN";
			}
2295 2296
		}

2297
		if (ata_id_cdb_intr(dev->id)) {
2298
			dev->flags |= ATA_DFLAG_CDB_INTR;
2299 2300
			cdb_intr_string = ", CDB intr";
		}
2301

2302 2303 2304 2305 2306
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

L
Linus Torvalds 已提交
2307
		/* print device info to dmesg */
2308
		if (ata_msg_drv(ap) && print_info)
2309
			ata_dev_printk(dev, KERN_INFO,
2310
				       "ATAPI: %s, %s, max %s%s%s%s\n",
2311
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2312
				       ata_mode_string(xfer_mask),
2313 2314
				       cdb_intr_string, atapi_an_string,
				       dma_dir_string);
L
Linus Torvalds 已提交
2315 2316
	}

2317 2318 2319 2320 2321
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2322 2323 2324 2325 2326 2327 2328
	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;
	}

2329 2330
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2331
	if (ata_dev_knobble(dev)) {
2332
		if (ata_msg_drv(ap) && print_info)
2333 2334
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2335
		dev->udma_mask &= ATA_UDMA5;
2336 2337 2338
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2339
	if ((dev->class == ATA_DEV_ATAPI) &&
2340
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2341
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2342 2343
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2344

T
Tejun Heo 已提交
2345
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2346 2347
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2348

2349 2350 2351 2352 2353 2354 2355
	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;
	}

2356
	if (ap->ops->dev_config)
2357
		ap->ops->dev_config(dev);
2358

2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
	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");
		}
	}

2374
	return 0;
L
Linus Torvalds 已提交
2375 2376

err_out_nosup:
2377
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2378
		ata_dev_printk(dev, KERN_DEBUG,
2379
			       "%s: EXIT, err\n", __func__);
2380
	return rc;
L
Linus Torvalds 已提交
2381 2382
}

A
Alan Cox 已提交
2383
/**
2384
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2385 2386
 *	@ap: port
 *
2387
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2388 2389 2390 2391 2392 2393 2394 2395 2396
 *	detection.
 */

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

/**
2397
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2398 2399
 *	@ap: port
 *
2400
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420
 *	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
2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
/**
 *	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
2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444
/**
 *	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
2445 2446 2447 2448
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2449 2450 2451 2452
 *	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
2453
 *	LOCKING:
J
Jeff Garzik 已提交
2454
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2455 2456
 *
 *	RETURNS:
2457
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2458 2459
 */

2460
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2461
{
2462
	unsigned int classes[ATA_MAX_DEVICES];
2463
	int tries[ATA_MAX_DEVICES];
2464
	int rc;
2465
	struct ata_device *dev;
L
Linus Torvalds 已提交
2466

2467
	ata_port_probe(ap);
2468

2469 2470
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2471 2472

 retry:
T
Tejun Heo 已提交
2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491
	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);
	}

2492
	/* reset and determine device classes */
2493
	ap->ops->phy_reset(ap);
2494

2495
	ata_link_for_each_dev(dev, &ap->link) {
2496 2497 2498 2499 2500
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2501

2502
		dev->class = ATA_DEV_UNKNOWN;
2503
	}
L
Linus Torvalds 已提交
2504

2505
	ata_port_probe(ap);
2506

2507 2508 2509 2510
	/* 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 */

2511
	ata_link_for_each_dev_reverse(dev, &ap->link) {
2512 2513
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2514

2515
		if (!ata_dev_enabled(dev))
2516 2517
			continue;

2518 2519
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2520 2521
		if (rc)
			goto fail;
2522 2523
	}

A
Alan Cox 已提交
2524 2525 2526 2527
	/* 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
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
	/* 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;
	}

2539 2540 2541
	/* 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 */

2542
	ata_link_for_each_dev(dev, &ap->link) {
2543 2544
		if (!ata_dev_enabled(dev))
			continue;
2545

T
Tejun Heo 已提交
2546
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2547
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2548
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2549 2550
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2551 2552
	}

2553
	/* configure transfer mode */
2554
	rc = ata_set_mode(&ap->link, &dev);
2555
	if (rc)
2556
		goto fail;
L
Linus Torvalds 已提交
2557

2558 2559
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2560
			return 0;
L
Linus Torvalds 已提交
2561

2562 2563
	/* no device present, disable port */
	ata_port_disable(ap);
2564
	return -ENODEV;
2565 2566

 fail:
2567 2568
	tries[dev->devno]--;

2569 2570
	switch (rc) {
	case -EINVAL:
2571
		/* eeek, something went very wrong, give up */
2572 2573
		tries[dev->devno] = 0;
		break;
2574 2575 2576 2577

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2578
	case -EIO:
2579 2580 2581 2582
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2583
			sata_down_spd_limit(&ap->link);
2584 2585
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2586 2587
	}

2588
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2589
		ata_dev_disable(dev);
2590

2591
	goto retry;
L
Linus Torvalds 已提交
2592 2593 2594
}

/**
J
Jeff Garzik 已提交
2595 2596
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2597
 *
J
Jeff Garzik 已提交
2598 2599 2600
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2601
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2602
 *	serialization.
L
Linus Torvalds 已提交
2603 2604 2605 2606
 */

void ata_port_probe(struct ata_port *ap)
{
2607
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2608 2609
}

2610 2611
/**
 *	sata_print_link_status - Print SATA link status
2612
 *	@link: SATA link to printk link status about
2613 2614 2615 2616 2617 2618
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2619
static void sata_print_link_status(struct ata_link *link)
2620
{
2621
	u32 sstatus, scontrol, tmp;
2622

2623
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2624
		return;
2625
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2626

2627
	if (ata_link_online(link)) {
2628
		tmp = (sstatus >> 4) & 0xf;
2629
		ata_link_printk(link, KERN_INFO,
2630 2631
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2632
	} else {
2633
		ata_link_printk(link, KERN_INFO,
2634 2635
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2636 2637 2638
	}
}

2639 2640 2641 2642 2643 2644 2645
/**
 *	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
 */
2646

T
Tejun Heo 已提交
2647
struct ata_device *ata_dev_pair(struct ata_device *adev)
2648
{
T
Tejun Heo 已提交
2649 2650
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2651
	if (!ata_dev_enabled(pair))
2652 2653 2654 2655
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2656
/**
J
Jeff Garzik 已提交
2657 2658
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2659
 *
J
Jeff Garzik 已提交
2660 2661 2662 2663 2664
 *	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
2665
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2666
 *	serialization.
L
Linus Torvalds 已提交
2667 2668 2669 2670
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2671 2672
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2673
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2674 2675
}

2676
/**
2677
 *	sata_down_spd_limit - adjust SATA spd limit downward
2678
 *	@link: Link to adjust SATA spd limit for
2679
 *
2680
 *	Adjust SATA spd limit of @link downward.  Note that this
2681
 *	function only adjusts the limit.  The change must be applied
2682
 *	using sata_set_spd().
2683 2684 2685 2686 2687 2688 2689
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2690
int sata_down_spd_limit(struct ata_link *link)
2691
{
2692 2693
	u32 sstatus, spd, mask;
	int rc, highbit;
2694

2695
	if (!sata_scr_valid(link))
2696 2697 2698
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2699
	 * If not, use cached value in link->sata_spd.
2700
	 */
2701
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2702 2703 2704
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2705
		spd = link->sata_spd;
2706

2707
	mask = link->sata_spd_limit;
2708 2709
	if (mask <= 1)
		return -EINVAL;
2710 2711

	/* unconditionally mask off the highest bit */
2712 2713 2714
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2715 2716 2717 2718 2719 2720 2721 2722 2723
	/* 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? */
2724 2725 2726
	if (!mask)
		return -EINVAL;

2727
	link->sata_spd_limit = mask;
2728

2729
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2730
			sata_spd_string(fls(mask)));
2731 2732 2733 2734

	return 0;
}

2735
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2736
{
2737 2738
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2739

2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750
	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;
2751
	else
2752
		target = fls(limit);
2753 2754

	spd = (*scontrol >> 4) & 0xf;
2755
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2756

2757
	return spd != target;
2758 2759 2760
}

/**
2761
 *	sata_set_spd_needed - is SATA spd configuration needed
2762
 *	@link: Link in question
2763 2764
 *
 *	Test whether the spd limit in SControl matches
2765
 *	@link->sata_spd_limit.  This function is used to determine
2766 2767 2768 2769 2770 2771 2772 2773 2774
 *	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
2775
static int sata_set_spd_needed(struct ata_link *link)
2776 2777 2778
{
	u32 scontrol;

2779
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2780
		return 1;
2781

2782
	return __sata_set_spd_needed(link, &scontrol);
2783 2784 2785
}

/**
2786
 *	sata_set_spd - set SATA spd according to spd limit
2787
 *	@link: Link to set SATA spd for
2788
 *
2789
 *	Set SATA spd of @link according to sata_spd_limit.
2790 2791 2792 2793 2794 2795
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2796
 *	changed.  Negative errno if SCR registers are inaccessible.
2797
 */
2798
int sata_set_spd(struct ata_link *link)
2799 2800
{
	u32 scontrol;
2801
	int rc;
2802

2803
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2804
		return rc;
2805

2806
	if (!__sata_set_spd_needed(link, &scontrol))
2807 2808
		return 0;

2809
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2810 2811
		return rc;

2812 2813 2814
	return 1;
}

A
Alan Cox 已提交
2815 2816 2817 2818 2819
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2820
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2821
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2822 2823 2824
 * 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
2825 2826 2827
 */

static const struct ata_timing ata_timing[] = {
2828 2829 2830 2831 2832 2833 2834 2835
/*	{ 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
2836

2837 2838 2839
	{ 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
2840

2841 2842 2843
	{ 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 },
2844
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
2845
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
A
Alan Cox 已提交
2846 2847

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
2848 2849 2850 2851 2852 2853 2854
	{ 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
2855 2856 2857 2858

	{ 0xFF }
};

2859 2860
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886

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);
}

2887
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2888
{
2889 2890 2891 2892
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2893

2894 2895 2896
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
2897 2898 2899 2900 2901 2902 2903 2904 2905
}

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;

	/*
2906
	 * Find the mode.
2907
	 */
A
Alan Cox 已提交
2908 2909 2910 2911

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

2912 2913
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2914 2915 2916 2917 2918 2919 2920
	/*
	 * 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));
2921
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
2922 2923
			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];
2924
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
2925 2926 2927 2928 2929 2930 2931 2932 2933
			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.
	 */

2934
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2935 2936

	/*
2937 2938 2939
	 * 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
2940 2941
	 */

2942
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2943 2944 2945 2946 2947
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2948
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959
	 */

	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
2960

2961 2962 2963 2964 2965
	/* 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
2966 2967 2968 2969

	return 0;
}

2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020
/**
 *	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;
}

3021 3022 3023
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3024
 *	@sel: ATA_DNXFER_* selector
3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
 *
 *	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
 */
3036
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3037
{
3038
	char buf[32];
3039 3040
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3041
	int quiet, highbit;
3042

3043 3044
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3045

3046 3047 3048 3049
	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);
3050

3051 3052 3053 3054 3055 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
	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);
	}
3103 3104 3105 3106 3107 3108 3109

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

	return 0;
}

T
Tejun Heo 已提交
3110
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3111
{
T
Tejun Heo 已提交
3112
	struct ata_eh_context *ehc = &dev->link->eh_context;
3113 3114
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3115 3116
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
3117

3118
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3119 3120 3121
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
3122
	err_mask = ata_dev_set_xfermode(dev);
3123

3124 3125 3126 3127 3128 3129 3130 3131 3132 3133
	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;

3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148
	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;
	}
3149 3150
	/* 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 */
3151
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3152 3153
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3154
		ign_dev_err = 1;
3155

3156 3157 3158
	/* 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
3159

3160 3161 3162 3163 3164 3165
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3166

3167 3168
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3169

3170 3171 3172 3173
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3174
	return 0;
3175 3176 3177 3178 3179

 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
3180 3181 3182
}

/**
3183
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3184
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3185
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3186
 *
3187 3188 3189
 *	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
3190
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3191
 *
L
Linus Torvalds 已提交
3192
 *	LOCKING:
J
Jeff Garzik 已提交
3193
 *	PCI/etc. bus probe sem.
3194 3195 3196
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3197
 */
3198

3199
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3200
{
3201
	struct ata_port *ap = link->ap;
3202
	struct ata_device *dev;
3203
	int rc = 0, used_dma = 0, found = 0;
3204

3205
	/* step 1: calculate xfer_mask */
3206
	ata_link_for_each_dev(dev, link) {
3207
		unsigned long pio_mask, dma_mask;
3208
		unsigned int mode_mask;
3209

3210
		if (!ata_dev_enabled(dev))
3211 3212
			continue;

3213 3214 3215 3216 3217 3218
		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
3219
		ata_dev_xfermask(dev);
3220
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3221

3222 3223
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3224 3225 3226 3227 3228 3229

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

3230 3231
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3232

3233
		found = 1;
3234
		if (dev->dma_mode != 0xff)
3235
			used_dma = 1;
3236
	}
3237
	if (!found)
3238
		goto out;
3239 3240

	/* step 2: always set host PIO timings */
3241
	ata_link_for_each_dev(dev, link) {
3242 3243 3244
		if (!ata_dev_enabled(dev))
			continue;

3245
		if (dev->pio_mode == 0xff) {
3246
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3247
			rc = -EINVAL;
3248
			goto out;
3249 3250 3251 3252 3253 3254 3255
		}

		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
3256

3257
	/* step 3: set host DMA timings */
3258
	ata_link_for_each_dev(dev, link) {
3259
		if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3260 3261 3262 3263 3264 3265 3266
			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
3267 3268

	/* step 4: update devices' xfer mode */
3269
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
3270
		/* don't update suspended devices' xfer mode */
3271
		if (!ata_dev_enabled(dev))
3272 3273
			continue;

T
Tejun Heo 已提交
3274
		rc = ata_dev_set_mode(dev);
3275
		if (rc)
3276
			goto out;
3277
	}
L
Linus Torvalds 已提交
3278

3279 3280
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3281
	 */
J
Jeff Garzik 已提交
3282
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3283
		ap->host->simplex_claimed = ap;
3284

3285 3286 3287 3288
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3289 3290
}

3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379
/**
 *	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;
	unsigned long nodev_deadline = start + ATA_TMOUT_FF_WAIT;
	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.
 */
3380
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3381 3382 3383 3384 3385 3386 3387
				int (*check_ready)(struct ata_link *link))
{
	msleep(ATA_WAIT_AFTER_RESET_MSECS);

	return ata_wait_ready(link, deadline, check_ready);
}

3388
/**
3389 3390
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3391
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3392
 *	@deadline: deadline jiffies for the operation
3393
 *
3394
*	Make sure SStatus of @link reaches stable state, determined by
3395 3396
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3397 3398
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3399 3400
 *	until timeout then returns 0 if DET is stable at 1.
 *
3401 3402 3403
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3404 3405 3406 3407 3408 3409
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3410 3411
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3412
{
3413
	unsigned long interval_msec = params[0];
3414 3415
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3416 3417 3418
	u32 last, cur;
	int rc;

3419 3420 3421 3422
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3423
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3424 3425 3426 3427 3428 3429 3430 3431
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3432
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3433 3434 3435 3436 3437
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3438
			if (cur == 1 && time_before(jiffies, deadline))
3439 3440 3441 3442 3443 3444 3445 3446 3447 3448
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3449 3450 3451
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3452
		if (time_after(jiffies, deadline))
3453
			return -EPIPE;
3454 3455 3456 3457
	}
}

/**
3458 3459
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3460
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3461
 *	@deadline: deadline jiffies for the operation
3462
 *
3463
 *	Resume SATA phy @link and debounce it.
3464 3465 3466 3467 3468 3469 3470
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3471 3472
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3473
{
3474
	u32 scontrol, serror;
3475 3476
	int rc;

3477
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3478
		return rc;
3479

3480
	scontrol = (scontrol & 0x0f0) | 0x300;
3481

3482
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3483
		return rc;
3484

3485 3486 3487 3488
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3489

3490 3491 3492
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3493
	/* clear SError, some PHYs require this even for SRST to work */
3494 3495 3496
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3497
	return rc != -EINVAL ? rc : 0;
3498 3499
}

3500
/**
3501
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3502
 *	@link: ATA link to be reset
3503
 *	@deadline: deadline jiffies for the operation
3504
 *
T
Tejun Heo 已提交
3505
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3506 3507 3508 3509
 *	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.
3510 3511 3512 3513 3514 3515 3516
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3517
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3518
{
T
Tejun Heo 已提交
3519
	struct ata_port *ap = link->ap;
3520
	struct ata_eh_context *ehc = &link->eh_context;
3521
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3522 3523 3524 3525 3526 3527
	int rc;

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

3528
	/* if SATA, resume link */
3529
	if (ap->flags & ATA_FLAG_SATA) {
3530
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3531 3532
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3533
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3534 3535 3536
					"link for reset (errno=%d)\n", rc);
	}

3537 3538 3539 3540
	/* no point in trying softreset on offline link */
	if (ata_link_offline(link))
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3541 3542 3543
	return 0;
}

3544
/**
T
Tejun Heo 已提交
3545 3546 3547
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3548
 *	@deadline: deadline jiffies for the operation
3549 3550
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3551
 *
T
Tejun Heo 已提交
3552
 *	SATA phy-reset @link using DET bits of SControl register.
3553 3554 3555 3556 3557 3558 3559 3560
 *	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.
3561 3562 3563 3564 3565 3566 3567
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3568
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3569 3570
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3571
{
T
Tejun Heo 已提交
3572
	u32 scontrol;
3573
	int rc;
3574

3575 3576
	DPRINTK("ENTER\n");

3577 3578 3579
	if (online)
		*online = false;

3580
	if (sata_set_spd_needed(link)) {
3581 3582 3583 3584 3585
		/* 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.
		 */
3586
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3587
			goto out;
3588

3589
		scontrol = (scontrol & 0x0f0) | 0x304;
3590

3591
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3592
			goto out;
3593

3594
		sata_set_spd(link);
3595 3596 3597
	}

	/* issue phy wake/reset */
3598
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3599
		goto out;
3600

3601
	scontrol = (scontrol & 0x0f0) | 0x301;
3602

3603
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3604
		goto out;
3605

3606
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3607 3608 3609 3610
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3611 3612
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3613 3614 3615 3616 3617 3618 3619 3620 3621 3622
	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
3623
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643
		/* 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;

			pmp_deadline = jiffies + ATA_TMOUT_PMP_SRST_WAIT;
			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);
3644
 out:
3645 3646 3647 3648
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3649 3650
		ata_link_printk(link, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
3651
	}
3652 3653 3654 3655
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681
/**
 *	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;
}

3682
/**
3683
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3684
 *	@link: the target ata_link
3685 3686 3687 3688 3689 3690 3691 3692 3693
 *	@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)
 */
3694
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3695
{
3696 3697
	u32 serror;

3698 3699
	DPRINTK("ENTER\n");

3700 3701 3702 3703
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3704
	/* print link status */
3705
	sata_print_link_status(link);
3706 3707 3708 3709

	DPRINTK("EXIT\n");
}

3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725
/**
 *	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
3726 3727
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3728 3729
{
	const u16 *old_id = dev->id;
3730 3731
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3732 3733

	if (dev->class != new_class) {
3734 3735
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3736 3737 3738
		return 0;
	}

3739 3740 3741 3742
	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]));
3743 3744

	if (strcmp(model[0], model[1])) {
3745 3746
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3747 3748 3749 3750
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3751 3752
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3753 3754 3755 3756 3757 3758 3759
		return 0;
	}

	return 1;
}

/**
3760
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3761
 *	@dev: target ATA device
3762
 *	@readid_flags: read ID flags
3763 3764 3765 3766 3767 3768 3769 3770 3771 3772
 *
 *	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
 */
3773
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3774
{
3775
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3776
	u16 *id = (void *)dev->link->ap->sector_buf;
3777 3778
	int rc;

3779
	/* read ID data */
3780
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3781
	if (rc)
3782
		return rc;
3783 3784

	/* is the device still there? */
3785 3786
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3787

3788
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3789 3790 3791 3792 3793 3794
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3795
 *	@new_class: new class code
3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806
 *	@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
 */
3807 3808
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3809
{
3810
	u64 n_sectors = dev->n_sectors;
3811 3812 3813 3814 3815
	int rc;

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

3816 3817 3818 3819 3820 3821 3822 3823 3824
	/* 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;
	}

3825 3826 3827 3828
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3829 3830

	/* configure device according to the new ID */
3831
	rc = ata_dev_configure(dev);
3832 3833 3834 3835
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
3836 3837
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
3838 3839 3840 3841
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
3842 3843 3844 3845

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

3846 3847 3848 3849 3850
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3851 3852

 fail:
3853
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3854 3855 3856
	return rc;
}

3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892
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 },
3893
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
3894
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3895 3896 3897
	/* Odd clown on sil3726/4726 PMPs */
	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
						ATA_HORKAGE_SKIP_PM },
3898

3899
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3900
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3901

3902 3903 3904 3905
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
3906
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
3907
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3908 3909
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3910
	/* NCQ is broken */
3911
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3912
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
3913
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
3914
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
3915

3916 3917 3918 3919 3920
	/* 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, },
3921

3922 3923 3924 3925 3926
	/* 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 },
3927

3928 3929 3930
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
3931
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
3932

A
Alan Cox 已提交
3933 3934
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
3935 3936 3937
	/* 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
3938
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
3939 3940 3941
	{ "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
3942

3943 3944
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3945
};
3946

3947
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
3948 3949 3950 3951 3952 3953 3954 3955 3956 3957
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
3958
	else {
3959
		len = strlen(name);
3960 3961 3962 3963 3964 3965
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
3966 3967 3968 3969

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
3970
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3971
{
T
Tejun Heo 已提交
3972 3973
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3974
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3975

T
Tejun Heo 已提交
3976 3977
	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
3978

3979
	while (ad->model_num) {
3980
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
3981 3982
			if (ad->model_rev == NULL)
				return ad->horkage;
3983
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
3984
				return ad->horkage;
3985
		}
3986
		ad++;
3987
	}
L
Linus Torvalds 已提交
3988 3989 3990
	return 0;
}

3991 3992 3993 3994 3995 3996
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
3997
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
3998 3999
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4000
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4001 4002
}

A
Alan Cox 已提交
4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017
/**
 *	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);
}

4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041
/**
 *	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
4042 4043 4044 4045
	/* 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;
4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064
	/* 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;
}

4065 4066 4067 4068
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4069 4070 4071 4072
 *	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...
4073 4074 4075 4076
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4077
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4078
{
T
Tejun Heo 已提交
4079 4080
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4081
	struct ata_host *host = ap->host;
4082
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4083

4084
	/* controller modes available */
4085 4086 4087
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4088
	/* drive modes available */
4089 4090 4091
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4092

4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103
	/*
	 *	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));
	}

4104 4105
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4106 4107
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4108
	}
4109

4110
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4111
	    host->simplex_claimed && host->simplex_claimed != ap) {
4112 4113 4114
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4115
	}
4116

J
Jeff Garzik 已提交
4117 4118 4119
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4120
	if (ap->ops->mode_filter)
4121
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4122

4123 4124 4125 4126 4127 4128 4129 4130 4131 4132
	/* 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 */
4133
		if (cable_is_40wire(ap)) {
4134
			ata_dev_printk(dev, KERN_WARNING,
4135 4136 4137 4138
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4139 4140
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4141 4142 4143 4144 4145 4146
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4147 4148 4149
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4150
 *	LOCKING:
J
Jeff Garzik 已提交
4151
 *	PCI/etc. bus probe sem.
4152 4153 4154
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4155 4156
 */

T
Tejun Heo 已提交
4157
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4158
{
4159
	struct ata_taskfile tf;
4160
	unsigned int err_mask;
L
Linus Torvalds 已提交
4161 4162 4163 4164

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

T
Tejun Heo 已提交
4165 4166 4167
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4168
	ata_tf_init(dev, &tf);
4169 4170
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4171
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4172
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4173
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4174 4175
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4176 4177
	/* 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
4178
		tf.nsect = 0x01;
A
Alan Cox 已提交
4179 4180
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4181

4182
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4183 4184 4185 4186 4187

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4188
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4189 4190
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4191
 *	@feature: The sector count represents the feature to set
4192 4193
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4194
 *	on port @ap with sector count
4195 4196 4197 4198 4199 4200 4201
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4202 4203
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215
{
	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;
4216
	tf.nsect = feature;
4217

4218
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4219

4220 4221
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4222 4223
}

4224 4225 4226
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4227 4228
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4229 4230
 *
 *	LOCKING:
4231 4232 4233 4234
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4235
 */
T
Tejun Heo 已提交
4236 4237
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4238
{
4239
	struct ata_taskfile tf;
4240
	unsigned int err_mask;
4241 4242 4243

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4244
		return AC_ERR_INVALID;
4245 4246 4247 4248

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

T
Tejun Heo 已提交
4249
	ata_tf_init(dev, &tf);
4250 4251 4252 4253 4254
	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 */
4255

4256
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4257 4258 4259 4260 4261
	/* 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;
4262

4263 4264
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4265 4266
}

L
Linus Torvalds 已提交
4267
/**
J
Jeff Garzik 已提交
4268 4269 4270 4271
 *	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
4272 4273
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4274
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4275
 */
4276
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4277 4278
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4279
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4280 4281
	int dir = qc->dma_dir;

4282
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4283

4284
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4285

4286 4287
	if (qc->n_elem)
		dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
L
Linus Torvalds 已提交
4288 4289

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4290
	qc->sg = NULL;
L
Linus Torvalds 已提交
4291 4292 4293 4294 4295 4296
}

/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4297 4298 4299 4300
 *	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
4301
 *	LOCKING:
T
Tejun Heo 已提交
4302 4303 4304 4305 4306 4307 4308 4309
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4310

T
Tejun Heo 已提交
4311 4312 4313 4314 4315
	/* 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;
4316

T
Tejun Heo 已提交
4317 4318
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4319

T
Tejun Heo 已提交
4320 4321
	return 0;
}
L
Linus Torvalds 已提交
4322

T
Tejun Heo 已提交
4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340
/**
 *	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;
4341

T
Tejun Heo 已提交
4342 4343 4344 4345 4346 4347 4348
	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;
	}
4349

T
Tejun Heo 已提交
4350 4351
	return ATA_DEFER_LINK;
}
4352

T
Tejun Heo 已提交
4353
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4354

T
Tejun Heo 已提交
4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374
/**
 *	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;
}
4375

T
Tejun Heo 已提交
4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392
/**
 *	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
4393

T
Tejun Heo 已提交
4394
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4395

T
Tejun Heo 已提交
4396 4397 4398
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4399

T
Tejun Heo 已提交
4400
	DPRINTK("%d sg elements mapped\n", n_elem);
4401

T
Tejun Heo 已提交
4402 4403
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4404

T
Tejun Heo 已提交
4405
	return 0;
L
Linus Torvalds 已提交
4406 4407
}

T
Tejun Heo 已提交
4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420
/**
 *	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)
4421
{
T
Tejun Heo 已提交
4422 4423
#ifdef __BIG_ENDIAN
	unsigned int i;
4424

T
Tejun Heo 已提交
4425 4426 4427
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4428 4429
}

L
Linus Torvalds 已提交
4430 4431 4432 4433 4434 4435
/**
 *	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
4436
 *	None.
L
Linus Torvalds 已提交
4437 4438 4439 4440 4441 4442 4443
 */

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

4444
	/* no command while frozen */
4445
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4446 4447
		return NULL;

4448 4449
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4450
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4451
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465
			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
4466
 *	None.
L
Linus Torvalds 已提交
4467 4468
 */

T
Tejun Heo 已提交
4469
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4470
{
T
Tejun Heo 已提交
4471
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4472 4473 4474 4475 4476 4477 4478 4479
	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
4480
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493
	}

	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
4494
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4495 4496 4497
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4498 4499 4500
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4501
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4502

4503 4504 4505 4506
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4507
		clear_bit(tag, &ap->qc_allocated);
4508
	}
L
Linus Torvalds 已提交
4509 4510
}

4511
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4512
{
4513
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4514
	struct ata_link *link = qc->dev->link;
4515

4516 4517
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4518 4519 4520 4521

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

4522
	/* command should be marked inactive atomically with qc completion */
4523
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4524
		link->sactive &= ~(1 << qc->tag);
4525 4526 4527
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4528
		link->active_tag = ATA_TAG_POISON;
4529 4530 4531 4532 4533 4534 4535
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4536

4537 4538 4539 4540 4541
	/* 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;
4542
	ap->qc_active &= ~(1 << qc->tag);
4543

L
Linus Torvalds 已提交
4544
	/* call completion callback */
4545
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4546 4547
}

4548 4549 4550 4551 4552
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4553
	ap->ops->qc_fill_rtf(qc);
4554 4555
}

4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571
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;
}

4572 4573 4574 4575 4576 4577 4578 4579 4580
/**
 *	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
4581
 *	spin_lock_irqsave(host lock)
4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600
 */
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) {
4601 4602 4603
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4604
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4605 4606 4607 4608 4609 4610 4611

		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 */
4612
				fill_result_tf(qc);
4613 4614 4615 4616 4617 4618 4619
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4620
			fill_result_tf(qc);
4621

4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636
		/* 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;
4637 4638 4639 4640

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4641 4642
		}

4643 4644 4645
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4646 4647 4648 4649 4650 4651 4652
		__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)
4653
			fill_result_tf(qc);
4654 4655 4656 4657 4658

		__ata_qc_complete(qc);
	}
}

4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669
/**
 *	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
4670
 *	spin_lock_irqsave(host lock)
4671 4672 4673 4674
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4675
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703
{
	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
4704 4705 4706 4707 4708 4709 4710 4711 4712 4713
/**
 *	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
4714
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4715
 */
4716
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4717 4718
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4719
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
4720
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
4721

4722 4723 4724 4725
	/* 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
4726
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4727

4728
	if (ata_is_ncq(prot)) {
T
Tejun Heo 已提交
4729
		WARN_ON(link->sactive & (1 << qc->tag));
4730 4731 4732

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
4733
		link->sactive |= 1 << qc->tag;
4734
	} else {
T
Tejun Heo 已提交
4735
		WARN_ON(link->sactive);
4736 4737

		ap->nr_active_links++;
T
Tejun Heo 已提交
4738
		link->active_tag = qc->tag;
4739 4740
	}

4741
	qc->flags |= ATA_QCFLAG_ACTIVE;
4742
	ap->qc_active |= 1 << qc->tag;
4743

4744 4745 4746
	/* 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
4747
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
4748

T
Tejun Heo 已提交
4749
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4750
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
4751 4752
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
4753

T
Tejun Heo 已提交
4754
	/* if device is sleeping, schedule reset and abort the link */
4755
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
4756
		link->eh_info.action |= ATA_EH_RESET;
4757 4758 4759 4760 4761
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
4762 4763
	ap->ops->qc_prep(qc);

4764 4765 4766 4767
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4768

4769
sg_err:
4770 4771 4772
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4773 4774
}

4775 4776
/**
 *	sata_scr_valid - test whether SCRs are accessible
4777
 *	@link: ATA link to test SCR accessibility for
4778
 *
4779
 *	Test whether SCRs are accessible for @link.
4780 4781 4782 4783 4784 4785 4786
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
4787
int sata_scr_valid(struct ata_link *link)
4788
{
4789 4790
	struct ata_port *ap = link->ap;

4791
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
4792 4793 4794 4795
}

/**
 *	sata_scr_read - read SCR register of the specified port
4796
 *	@link: ATA link to read SCR for
4797 4798 4799
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
4800
 *	Read SCR register @reg of @link into *@val.  This function is
4801 4802
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
4803 4804
 *
 *	LOCKING:
4805
 *	None if @link is ap->link.  Kernel thread context otherwise.
4806 4807 4808 4809
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
4810
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
4811
{
4812 4813
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
4814

4815 4816 4817 4818 4819 4820
		if (sata_scr_valid(link))
			return ap->ops->scr_read(ap, reg, val);
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
4821 4822 4823 4824
}

/**
 *	sata_scr_write - write SCR register of the specified port
4825
 *	@link: ATA link to write SCR for
4826 4827 4828
 *	@reg: SCR to write
 *	@val: value to write
 *
4829
 *	Write @val to SCR register @reg of @link.  This function is
4830 4831
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
4832 4833
 *
 *	LOCKING:
4834
 *	None if @link is ap->link.  Kernel thread context otherwise.
4835 4836 4837 4838
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
4839
int sata_scr_write(struct ata_link *link, int reg, u32 val)
4840
{
4841 4842 4843 4844 4845 4846 4847
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;

		if (sata_scr_valid(link))
			return ap->ops->scr_write(ap, reg, val);
		return -EOPNOTSUPP;
	}
4848

4849
	return sata_pmp_scr_write(link, reg, val);
4850 4851 4852 4853
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
4854
 *	@link: ATA link to write SCR for
4855 4856 4857 4858 4859 4860 4861
 *	@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:
4862
 *	None if @link is ap->link.  Kernel thread context otherwise.
4863 4864 4865 4866
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
4867
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
4868
{
4869 4870 4871
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
		int rc;
4872

4873 4874 4875 4876 4877 4878 4879
		if (sata_scr_valid(link)) {
			rc = ap->ops->scr_write(ap, reg, val);
			if (rc == 0)
				rc = ap->ops->scr_read(ap, reg, &val);
			return rc;
		}
		return -EOPNOTSUPP;
4880
	}
4881 4882

	return sata_pmp_scr_write(link, reg, val);
4883 4884 4885
}

/**
4886 4887
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
4888
 *
4889 4890 4891
 *	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).
4892 4893 4894 4895 4896 4897 4898
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
4899
int ata_link_online(struct ata_link *link)
4900 4901 4902
{
	u32 sstatus;

4903 4904
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
4905 4906 4907 4908 4909
		return 1;
	return 0;
}

/**
4910 4911
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
4912
 *
4913 4914 4915
 *	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).
4916 4917 4918 4919 4920 4921 4922
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
4923
int ata_link_offline(struct ata_link *link)
4924 4925 4926
{
	u32 sstatus;

4927 4928
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
4929 4930 4931
		return 1;
	return 0;
}
E
Edward Falk 已提交
4932

4933
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
4934 4935 4936
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
4937 4938 4939 4940
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
4941 4942
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
4943
		struct ata_link *link;
4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962

		/* 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;
4963 4964 4965 4966
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984

		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
4985 4986
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
4987 4988
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
4989
 *	Suspend @host.  Actual operation is performed by EH.  This
4990 4991 4992 4993 4994 4995 4996 4997 4998
 *	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
4999
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5000
{
5001
	int rc;
5002

5003 5004 5005 5006 5007 5008
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
5009
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5010 5011
	if (rc == 0)
		host->dev->power.power_state = mesg;
5012 5013 5014 5015
	return rc;
}

/**
J
Jeff Garzik 已提交
5016 5017
 *	ata_host_resume - resume host
 *	@host: host to resume
5018
 *
J
Jeff Garzik 已提交
5019
 *	Resume @host.  Actual operation is performed by EH.  This
5020 5021 5022 5023 5024 5025
 *	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
5026
void ata_host_resume(struct ata_host *host)
5027
{
T
Tejun Heo 已提交
5028
	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
J
Jeff Garzik 已提交
5029
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
5030
	host->dev->power.power_state = PMSG_ON;
5031 5032 5033

	/* reenable link pm */
	ata_lpm_disable(host);
5034
}
5035
#endif
5036

5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048
/**
 *	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.
 */
5049
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5050
{
5051
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5052

5053 5054
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5055 5056 5057 5058 5059 5060
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071
/**
 *	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
5072 5073
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
5074 5075
	unsigned long flags;

5076
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
5077 5078
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5079

5080 5081
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5082
	 * host lock.
5083
	 */
5084
	spin_lock_irqsave(ap->lock, flags);
5085
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5086
	dev->horkage = 0;
5087
	spin_unlock_irqrestore(ap->lock, flags);
5088

5089 5090
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5091 5092 5093 5094 5095
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5096 5097 5098 5099
/**
 *	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
5100
 *	@pmp: Port multiplier port number
5101 5102 5103 5104 5105 5106
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5107
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5108 5109 5110 5111 5112 5113 5114
{
	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
5115
	link->pmp = pmp;
5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141
	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.
 */
5142
int sata_link_init_spd(struct ata_link *link)
5143
{
5144 5145
	u32 scontrol;
	u8 spd;
5146 5147 5148 5149 5150 5151 5152 5153 5154 5155
	int rc;

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

	spd = (scontrol >> 4) & 0xf;
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5156 5157
	ata_force_spd_limit(link);

5158 5159 5160 5161 5162
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5163
/**
5164 5165
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5166
 *
5167 5168 5169 5170
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5171
 *
L
Linus Torvalds 已提交
5172
 *	LOCKING:
5173
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5174
 */
5175
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5176
{
5177
	struct ata_port *ap;
L
Linus Torvalds 已提交
5178

5179 5180 5181 5182 5183 5184
	DPRINTK("ENTER\n");

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

5185
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5186
	ap->lock = &host->lock;
5187
	ap->flags = ATA_FLAG_DISABLED;
5188
	ap->print_id = -1;
L
Linus Torvalds 已提交
5189
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5190
	ap->host = host;
5191
	ap->dev = host->dev;
L
Linus Torvalds 已提交
5192
	ap->last_ctl = 0xFF;
5193 5194 5195 5196 5197 5198

#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
5199
#else
5200
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5201
#endif
L
Linus Torvalds 已提交
5202

T
Tejun Heo 已提交
5203
#ifdef CONFIG_ATA_SFF
5204
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
T
Tejun Heo 已提交
5205
#endif
5206 5207
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5208
	INIT_LIST_HEAD(&ap->eh_done_q);
5209
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
5210 5211 5212
	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
5213

5214 5215
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5216
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5217 5218 5219 5220 5221 5222 5223 5224

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

5225 5226 5227 5228 5229
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5230 5231 5232
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5233 5234 5235 5236
		if (!ap)
			continue;

		if (ap->scsi_host)
5237 5238
			scsi_host_put(ap->scsi_host);

5239
		kfree(ap->pmp_link);
5240
		kfree(ap);
5241 5242 5243
		host->ports[i] = NULL;
	}

5244
	dev_set_drvdata(gendev, NULL);
5245 5246
}

5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311
/**
 *	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;
}

5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349
/**
 *	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;
5350
		ap->link.flags |= pi->link_flags;
5351 5352 5353 5354 5355 5356 5357 5358 5359
		ap->ops = pi->port_ops;

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

	return host;
}

5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377
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);
}

5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427
/**
 *	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)
{
	static spinlock_t lock = SPIN_LOCK_UNLOCKED;
	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);
}

5428 5429 5430 5431 5432 5433 5434
/**
 *	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
5435 5436
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5437 5438 5439 5440 5441 5442 5443 5444 5445
 *
 *	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)
{
5446 5447
	int have_stop = 0;
	void *start_dr = NULL;
5448 5449 5450 5451 5452
	int i, rc;

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

5453 5454
	ata_finalize_port_ops(host->ops);

5455 5456 5457
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5458 5459
		ata_finalize_port_ops(ap->ops);

5460 5461 5462
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478
		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];

5479 5480 5481
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5482
				if (rc != -ENODEV)
A
Andrew Morton 已提交
5483 5484 5485
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
5486 5487 5488 5489 5490 5491
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5492 5493
	if (start_dr)
		devres_add(host->dev, start_dr);
5494 5495 5496 5497 5498 5499 5500 5501 5502 5503
	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);
	}
5504
	devres_free(start_dr);
5505 5506 5507
	return rc;
}

5508
/**
J
Jeff Garzik 已提交
5509 5510 5511 5512 5513
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5514 5515 5516 5517 5518
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5519
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5520
void ata_host_init(struct ata_host *host, struct device *dev,
5521
		   unsigned long flags, struct ata_port_operations *ops)
5522
{
J
Jeff Garzik 已提交
5523 5524 5525 5526
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5527 5528
}

5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571
/**
 *	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;

5572 5573 5574
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

5575 5576 5577 5578 5579 5580 5581 5582 5583 5584
	/* 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 */
5585
		sata_link_init_spd(&ap->link);
5586

5587
		/* print per-port info to dmesg */
5588 5589 5590
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

5591
		if (!ata_port_is_dummy(ap)) {
5592 5593
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
5594
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5595
					ata_mode_string(xfer_mask),
5596
					ap->link.eh_info.desc);
5597 5598
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
5599 5600 5601 5602 5603 5604 5605 5606 5607 5608
			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
5609
			struct ata_eh_info *ehi = &ap->link.eh_info;
5610 5611 5612 5613 5614 5615 5616
			unsigned long flags;

			ata_port_probe(ap);

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

5617
			ehi->probe_mask |= ATA_ALL_DEVICES;
T
Tejun Heo 已提交
5618
			ehi->action |= ATA_EH_RESET;
5619 5620
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

5621
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
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
			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];

5650
		ata_scsi_scan_host(ap, 1);
5651
		ata_lpm_schedule(ap, ap->pm_policy);
5652 5653 5654 5655 5656
	}

	return 0;
}

5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669
/**
 *	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.
 *
5670 5671 5672 5673
 *	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.
 *
5674 5675 5676 5677 5678 5679 5680 5681 5682 5683
 *	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)
{
5684
	int i, rc;
5685 5686 5687 5688 5689

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

5690 5691 5692 5693 5694 5695
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

5696 5697 5698 5699 5700
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

5701 5702
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
5703

5704 5705 5706 5707 5708 5709 5710 5711
	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;
}

5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722
/**
 *	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).
 */
5723
static void ata_port_detach(struct ata_port *ap)
5724 5725
{
	unsigned long flags;
5726
	struct ata_link *link;
5727
	struct ata_device *dev;
5728 5729

	if (!ap->ops->error_handler)
5730
		goto skip_eh;
5731 5732

	/* tell EH we're leaving & flush EH */
5733
	spin_lock_irqsave(ap->lock, flags);
5734
	ap->pflags |= ATA_PFLAG_UNLOADING;
5735
	spin_unlock_irqrestore(ap->lock, flags);
5736 5737 5738

	ata_port_wait_eh(ap);

5739 5740
	/* EH is now guaranteed to see UNLOADING - EH context belongs
	 * to us.  Disable all existing devices.
5741
	 */
5742 5743 5744 5745
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
5746 5747 5748 5749 5750

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5751
	spin_lock_irqsave(ap->lock, flags);
5752
	ata_port_freeze(ap);	/* won't be thawed */
5753
	spin_unlock_irqrestore(ap->lock, flags);
5754 5755

	ata_port_wait_eh(ap);
5756
	cancel_rearming_delayed_work(&ap->hotplug_task);
5757

5758
 skip_eh:
5759
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5760
	scsi_remove_host(ap->scsi_host);
5761 5762
}

T
Tejun Heo 已提交
5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777
/**
 *	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]);
5778 5779 5780

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
5781 5782
}

5783 5784
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
5785 5786 5787 5788
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
5789 5790 5791
 *	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
5792 5793 5794 5795
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
5796
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
5797
{
5798
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
5799
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
5800

T
Tejun Heo 已提交
5801
	ata_host_detach(host);
L
Linus Torvalds 已提交
5802 5803 5804
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
5805
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836
{
	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
5837

5838
#ifdef CONFIG_PM
5839
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
5840 5841
{
	pci_save_state(pdev);
5842
	pci_disable_device(pdev);
5843

5844
	if (mesg.event & PM_EVENT_SLEEP)
5845
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
5846 5847
}

5848
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
5849
{
5850 5851
	int rc;

J
Jens Axboe 已提交
5852 5853
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
5854

T
Tejun Heo 已提交
5855
	rc = pcim_enable_device(pdev);
5856 5857 5858 5859 5860 5861
	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
5862
	pci_set_master(pdev);
5863
	return 0;
5864 5865
}

5866
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
5867
{
J
Jeff Garzik 已提交
5868
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
5869 5870
	int rc = 0;

J
Jeff Garzik 已提交
5871
	rc = ata_host_suspend(host, mesg);
5872 5873 5874
	if (rc)
		return rc;

5875
	ata_pci_device_do_suspend(pdev, mesg);
5876 5877 5878 5879 5880 5881

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
5882
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
5883
	int rc;
5884

5885 5886 5887 5888
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
5889
}
5890 5891
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
5892 5893
#endif /* CONFIG_PCI */

5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 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 6029 6030 6031 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
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) },
	};
	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
6068 6069 6070

static int __init ata_init(void)
{
A
Andrew Morton 已提交
6071
	ata_probe_timeout *= HZ;
6072 6073 6074

	ata_parse_force_param();

L
Linus Torvalds 已提交
6075 6076 6077 6078
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6079 6080 6081 6082 6083 6084
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6085 6086 6087 6088 6089 6090
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
6091
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6092
	destroy_workqueue(ata_wq);
6093
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6094 6095
}

6096
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6097 6098
module_exit(ata_exit);

6099
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6100
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119

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;
}

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 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	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,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	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.
	 */
	timeout = jiffies + (timeout_msec * HZ) / 1000;

	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
		msleep(interval_msec);
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6166 6167 6168
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6169
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6170
{
T
Tejun Heo 已提交
6171
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6172 6173
}

T
Tejun Heo 已提交
6174
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6175
{
T
Tejun Heo 已提交
6176
	/* truly dummy */
T
Tejun Heo 已提交
6177 6178
}

6179
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6180 6181
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6182
	.error_handler		= ata_dummy_error_handler,
T
Tejun Heo 已提交
6183 6184
};

6185 6186 6187 6188
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6189 6190 6191 6192 6193 6194
/*
 * 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.
 */
6195 6196 6197
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6198 6199
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6200
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6201
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
6202
EXPORT_SYMBOL_GPL(ata_std_bios_param);
J
Jeff Garzik 已提交
6203
EXPORT_SYMBOL_GPL(ata_host_init);
6204
EXPORT_SYMBOL_GPL(ata_host_alloc);
6205
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6206
EXPORT_SYMBOL_GPL(ata_host_start);
6207
EXPORT_SYMBOL_GPL(ata_host_register);
6208
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6209
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6210
EXPORT_SYMBOL_GPL(ata_sg_init);
6211
EXPORT_SYMBOL_GPL(ata_qc_complete);
6212
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6213
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6214 6215
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6216 6217 6218 6219 6220 6221 6222
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
6223
EXPORT_SYMBOL_GPL(ata_port_start);
6224
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6225
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6226
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6227
EXPORT_SYMBOL_GPL(ata_port_probe);
6228
EXPORT_SYMBOL_GPL(ata_dev_disable);
6229
EXPORT_SYMBOL_GPL(sata_set_spd);
6230
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6231 6232
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6233
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6234
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6235
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6236
EXPORT_SYMBOL_GPL(ata_std_postreset);
6237 6238
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6239
EXPORT_SYMBOL_GPL(ata_port_disable);
6240
EXPORT_SYMBOL_GPL(ata_ratelimit);
6241
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6242 6243 6244
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6245
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6246
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6247 6248 6249 6250
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);
6251 6252
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6253
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6254 6255
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6256
#endif /* CONFIG_PM */
6257 6258
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
L
Linus Torvalds 已提交
6259 6260
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6261
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6262
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6263 6264
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6265
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6266

L
Linus Torvalds 已提交
6267 6268 6269
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6270
#ifdef CONFIG_PM
6271 6272
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6273 6274
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6275
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6276
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6277

T
Tejun Heo 已提交
6278 6279 6280
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6281 6282 6283 6284
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6285
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6286
EXPORT_SYMBOL_GPL(ata_link_abort);
6287
EXPORT_SYMBOL_GPL(ata_port_abort);
6288
EXPORT_SYMBOL_GPL(ata_port_freeze);
6289
EXPORT_SYMBOL_GPL(sata_async_notification);
6290 6291
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6292 6293
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6294
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6295
EXPORT_SYMBOL_GPL(ata_do_eh);
6296
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6297 6298 6299 6300

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6301
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6302
EXPORT_SYMBOL_GPL(ata_cable_sata);