libata-core.c 122.0 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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 */

#include <linux/config.h>
#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/highmem.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 <scsi/scsi.h>
#include "scsi_priv.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/io.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>

#include "libata.h"

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static unsigned int ata_dev_init_params(struct ata_port *ap,
					struct ata_device *dev);
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static void ata_set_mode(struct ata_port *ap);
static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
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static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift);
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static int fgb(u32 bitmap);
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static int ata_choose_xfer_mode(const struct ata_port *ap,
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				u8 *xfer_mode_out,
				unsigned int *xfer_shift_out);

static unsigned int ata_unique_id = 1;
static struct workqueue_struct *ata_wq;

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int atapi_enabled = 0;
module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (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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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@fis: Buffer into which data will output
 *	@pmp: Port multiplier port
 *
 *	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 *fis, u8 pmp)
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{
	fis[0] = 0x27;	/* Register - Host to Device FIS */
	fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
					    bit 7 indicates Command FIS */
	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
 *	@qc: command to examine and configure
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 *
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 *	Examine the device configuration and tf->flags to calculate 
 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
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int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
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{
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	struct ata_taskfile *tf = &qc->tf;
	struct ata_device *dev = qc->dev;
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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 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
		/* 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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static const char * const xfer_mode_str[] = {
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	"UDMA/16",
	"UDMA/25",
	"UDMA/33",
	"UDMA/44",
	"UDMA/66",
	"UDMA/100",
	"UDMA/133",
	"UDMA7",
	"MWDMA0",
	"MWDMA1",
	"MWDMA2",
	"PIO0",
	"PIO1",
	"PIO2",
	"PIO3",
	"PIO4",
};

/**
 *	ata_udma_string - convert UDMA bit offset to string
 *	@mask: mask of bits supported; only highest bit counts.
 *
 *	Determine string which represents the highest speed
 *	(highest bit in @udma_mask).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
 *	@udma_mask, or the constant C string "<n/a>".
 */

static const char *ata_mode_string(unsigned int mask)
{
	int i;

	for (i = 7; i >= 0; i--)
		if (mask & (1 << i))
			goto out;
	for (i = ATA_SHIFT_MWDMA + 2; i >= ATA_SHIFT_MWDMA; i--)
		if (mask & (1 << i))
			goto out;
	for (i = ATA_SHIFT_PIO + 4; i >= ATA_SHIFT_PIO; i--)
		if (mask & (1 << i))
			goto out;

	return "<n/a>";

out:
	return xfer_mode_str[i];
}

/**
 *	ata_pio_devchk - PATA device presence detection
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
 *
 *	This technique was originally described in
 *	Hale Landis's ATADRVR (www.ata-atapi.com), and
 *	later found its way into the ATA/ATAPI spec.
 *
 *	Write a pattern to the ATA shadow registers,
 *	and if a device is present, it will respond by
 *	correctly storing and echoing back the
 *	ATA shadow register contents.
 *
 *	LOCKING:
 *	caller.
 */

static unsigned int ata_pio_devchk(struct ata_port *ap,
				   unsigned int device)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

	ap->ops->dev_select(ap, device);

	outb(0x55, ioaddr->nsect_addr);
	outb(0xaa, ioaddr->lbal_addr);

	outb(0xaa, ioaddr->nsect_addr);
	outb(0x55, ioaddr->lbal_addr);

	outb(0x55, ioaddr->nsect_addr);
	outb(0xaa, ioaddr->lbal_addr);

	nsect = inb(ioaddr->nsect_addr);
	lbal = inb(ioaddr->lbal_addr);

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_mmio_devchk - PATA device presence detection
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
 *
 *	This technique was originally described in
 *	Hale Landis's ATADRVR (www.ata-atapi.com), and
 *	later found its way into the ATA/ATAPI spec.
 *
 *	Write a pattern to the ATA shadow registers,
 *	and if a device is present, it will respond by
 *	correctly storing and echoing back the
 *	ATA shadow register contents.
 *
 *	LOCKING:
 *	caller.
 */

static unsigned int ata_mmio_devchk(struct ata_port *ap,
				    unsigned int device)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	u8 nsect, lbal;

	ap->ops->dev_select(ap, device);

	writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
	writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);

	writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
	writeb(0x55, (void __iomem *) ioaddr->lbal_addr);

	writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
	writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);

	nsect = readb((void __iomem *) ioaddr->nsect_addr);
	lbal = readb((void __iomem *) ioaddr->lbal_addr);

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_devchk - PATA device presence detection
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
 *
 *	Dispatch ATA device presence detection, depending
 *	on whether we are using PIO or MMIO to talk to the
 *	ATA shadow registers.
 *
 *	LOCKING:
 *	caller.
 */

static unsigned int ata_devchk(struct ata_port *ap,
				    unsigned int device)
{
	if (ap->flags & ATA_FLAG_MMIO)
		return ata_mmio_devchk(ap, device);
	return ata_pio_devchk(ap, device);
}

/**
 *	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:
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
 *	the event of failure.
 */

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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
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{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
	 */

	if (((tf->lbam == 0) && (tf->lbah == 0)) ||
	    ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

	if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
	    ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

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

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
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 *	@r_err: Value of error register on completion
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
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 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

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static unsigned int
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
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{
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

	ap->ops->dev_select(ap, device);

	memset(&tf, 0, sizeof(tf));

	ap->ops->tf_read(ap, &tf);
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	err = tf.feature;
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	if (r_err)
		*r_err = err;
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	/* see if device passed diags */
	if (err == 1)
		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
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		return ATA_DEV_NONE;
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	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
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	if (class == ATA_DEV_UNKNOWN)
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		return ATA_DEV_NONE;
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	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
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		return ATA_DEV_NONE;
	return class;
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}

/**
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 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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 *	@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.
 */

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void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

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/**
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 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
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 *	@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.
 *
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 *	This function is identical to ata_id_string except that it
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 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
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void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
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{
	unsigned char *p;

	WARN_ON(!(len & 1));

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	ata_id_string(id, s, ofs, len - 1);
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	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			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];
	}
}

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/**
 *	ata_noop_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *
 *	This function performs no actual function.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
 *
 *	LOCKING:
 *	caller.
 */
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void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
{
}

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/**
 *	ata_std_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *
 *	Use the method defined in the ATA specification to
 *	make either device 0, or device 1, active on the
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 *	ATA channel.  Works with both PIO and MMIO.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
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 *
 *	LOCKING:
 *	caller.
 */

void ata_std_dev_select (struct ata_port *ap, unsigned int device)
{
	u8 tmp;

	if (device == 0)
		tmp = ATA_DEVICE_OBS;
	else
		tmp = ATA_DEVICE_OBS | ATA_DEV1;

	if (ap->flags & ATA_FLAG_MMIO) {
		writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
	} else {
		outb(tmp, ap->ioaddr.device_addr);
	}
	ata_pause(ap);		/* needed; also flushes, for mmio */
}

/**
 *	ata_dev_select - Select device 0/1 on ATA bus
 *	@ap: ATA channel to manipulate
 *	@device: ATA device (numbered from zero) to select
 *	@wait: non-zero to wait for Status register BSY bit to clear
 *	@can_sleep: non-zero if context allows sleeping
 *
 *	Use the method defined in the ATA specification to
 *	make either device 0, or device 1, active on the
 *	ATA channel.
 *
 *	This is a high-level version of ata_std_dev_select(),
 *	which additionally provides the services of inserting
 *	the proper pauses and status polling, where needed.
 *
 *	LOCKING:
 *	caller.
 */

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
	VPRINTK("ENTER, ata%u: device %u, wait %u\n",
		ap->id, device, wait);

	if (wait)
		ata_wait_idle(ap);

	ap->ops->dev_select(ap, device);

	if (wait) {
		if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
			msleep(150);
		ata_wait_idle(ap);
	}
}

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
658
 *	@id: IDENTIFY DEVICE page to dump
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 *
660 661
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

667
static inline void ata_dump_id(const u16 *id)
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{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
674 675 676 677 678
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
684 685 686 687 688
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
691 692
		id[88],
		id[93]);
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}

695 696 697 698 699 700 701
/*
 *	Compute the PIO modes available 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 ?). 
 */

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static unsigned int ata_pio_modes(const struct ata_device *adev)
703 704 705
{
	u16 modes;

706 707
	/* Usual case. Word 53 indicates word 64 is valid */
	if (adev->id[ATA_ID_FIELD_VALID] & (1 << 1)) {
708 709 710 711 712 713
		modes = adev->id[ATA_ID_PIO_MODES] & 0x03;
		modes <<= 3;
		modes |= 0x7;
		return modes;
	}

714 715 716
	/* If word 64 isn't valid then Word 51 high byte holds the PIO timing
	   number for the maximum. Turn it into a mask and return it */
	modes = (2 << ((adev->id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF)) - 1 ;
717
	return modes;
718 719 720 721
	/* 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 */
722 723
}

724 725 726
static inline void
ata_queue_packet_task(struct ata_port *ap)
{
727 728
	if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
		queue_work(ata_wq, &ap->packet_task);
729 730 731 732 733
}

static inline void
ata_queue_pio_task(struct ata_port *ap)
{
734 735
	if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
		queue_work(ata_wq, &ap->pio_task);
736 737 738 739 740
}

static inline void
ata_queue_delayed_pio_task(struct ata_port *ap, unsigned long delay)
{
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
	if (!(ap->flags & ATA_FLAG_FLUSH_PIO_TASK))
		queue_delayed_work(ata_wq, &ap->pio_task, delay);
}

/**
 *	ata_flush_pio_tasks - Flush pio_task and packet_task
 *	@ap: the target ata_port
 *
 *	After this function completes, pio_task and packet_task are
 *	guranteed not to be running or scheduled.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */

static void ata_flush_pio_tasks(struct ata_port *ap)
{
	int tmp = 0;
	unsigned long flags;

	DPRINTK("ENTER\n");

	spin_lock_irqsave(&ap->host_set->lock, flags);
	ap->flags |= ATA_FLAG_FLUSH_PIO_TASK;
	spin_unlock_irqrestore(&ap->host_set->lock, flags);

	DPRINTK("flush #1\n");
	flush_workqueue(ata_wq);

	/*
	 * At this point, if a task is running, it's guaranteed to see
	 * the FLUSH flag; thus, it will never queue pio tasks again.
	 * Cancel and flush.
	 */
	tmp |= cancel_delayed_work(&ap->pio_task);
	tmp |= cancel_delayed_work(&ap->packet_task);
	if (!tmp) {
		DPRINTK("flush #2\n");
		flush_workqueue(ata_wq);
	}

	spin_lock_irqsave(&ap->host_set->lock, flags);
	ap->flags &= ~ATA_FLAG_FLUSH_PIO_TASK;
	spin_unlock_irqrestore(&ap->host_set->lock, flags);

	DPRINTK("EXIT\n");
787 788
}

789
void ata_qc_complete_internal(struct ata_queued_cmd *qc)
790
{
791
	struct completion *waiting = qc->private_data;
792

793
	qc->ap->ops->tf_read(qc->ap, &qc->tf);
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
	complete(waiting);
}

/**
 *	ata_exec_internal - execute libata internal command
 *	@ap: Port to which the command is sent
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
 *
 *	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.
 */

static unsigned
ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
		  struct ata_taskfile *tf,
		  int dma_dir, void *buf, unsigned int buflen)
{
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
	DECLARE_COMPLETION(wait);
	unsigned long flags;
825
	unsigned int err_mask;
826 827 828 829 830 831 832 833 834 835 836 837 838

	spin_lock_irqsave(&ap->host_set->lock, flags);

	qc = ata_qc_new_init(ap, dev);
	BUG_ON(qc == NULL);

	qc->tf = *tf;
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
		ata_sg_init_one(qc, buf, buflen);
		qc->nsect = buflen / ATA_SECT_SIZE;
	}

839
	qc->private_data = &wait;
840 841
	qc->complete_fn = ata_qc_complete_internal;

842 843
	qc->err_mask = ata_qc_issue(qc);
	if (qc->err_mask)
844
		ata_qc_complete(qc);
845 846 847 848 849 850 851 852 853 854 855 856

	spin_unlock_irqrestore(&ap->host_set->lock, flags);

	if (!wait_for_completion_timeout(&wait, ATA_TMOUT_INTERNAL)) {
		spin_lock_irqsave(&ap->host_set->lock, flags);

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
		 * again.  If completion irq occurs after here but
		 * before the caller cleans up, it will result in a
		 * spurious interrupt.  We can live with that.
		 */
857
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
858
			qc->err_mask = AC_ERR_TIMEOUT;
859 860 861 862 863 864 865 866
			ata_qc_complete(qc);
			printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
			       ap->id, command);
		}

		spin_unlock_irqrestore(&ap->host_set->lock, flags);
	}

867 868 869 870 871 872
	*tf = qc->tf;
	err_mask = qc->err_mask;

	ata_qc_free(qc);

	return err_mask;
873 874
}

875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */

unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
	int pio;
	int speed = adev->pio_mode - XFER_PIO_0;

	if (speed < 2)
		return 0;
	if (speed > 2)
		return 1;
		
	/* If we have no drive specific rule, then PIO 2 is non IORDY */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
		pio = adev->id[ATA_ID_EIDE_PIO];
		/* 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 */
				return 1;
			return 0;
		}
	}
	return 0;
}

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/**
909 910 911 912 913
 *	ata_dev_read_id - Read ID data from the specified device
 *	@ap: port on which target device resides
 *	@dev: target device
 *	@p_class: pointer to class of the target device (may be changed)
 *	@post_reset: is this read ID post-reset?
914
 *	@p_id: read IDENTIFY page (newly allocated)
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 *
916 917 918 919 920
 *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
 *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
 *	devices.  This function also takes care of EDD signature
 *	misreporting (to be removed once EDD support is gone) and
 *	issues ATA_CMD_INIT_DEV_PARAMS for pre-ATA4 drives.
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 *
 *	LOCKING:
923 924 925 926
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
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 */
928
static int ata_dev_read_id(struct ata_port *ap, struct ata_device *dev,
929
			   unsigned int *p_class, int post_reset, u16 **p_id)
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{
931
	unsigned int class = *p_class;
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	unsigned int using_edd;
933
	struct ata_taskfile tf;
934
	unsigned int err_mask = 0;
935
	u16 *id;
936 937
	const char *reason;
	int rc;
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938

939
	DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
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940

941 942
	if (ap->ops->probe_reset ||
	    ap->flags & (ATA_FLAG_SRST | ATA_FLAG_SATA_RESET))
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		using_edd = 0;
	else
		using_edd = 1;

947
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
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949 950 951 952 953 954 955
	id = kmalloc(sizeof(id[0]) * ATA_ID_WORDS, GFP_KERNEL);
	if (id == NULL) {
		rc = -ENOMEM;
		reason = "out of memory";
		goto err_out;
	}

956 957
 retry:
	ata_tf_init(ap, &tf, dev->devno);
958

959 960
	switch (class) {
	case ATA_DEV_ATA:
961
		tf.command = ATA_CMD_ID_ATA;
962 963
		break;
	case ATA_DEV_ATAPI:
964
		tf.command = ATA_CMD_ID_ATAPI;
965 966 967 968 969
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
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	}

972
	tf.protocol = ATA_PROT_PIO;
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974
	err_mask = ata_exec_internal(ap, dev, &tf, DMA_FROM_DEVICE,
975
				     id, sizeof(id[0]) * ATA_ID_WORDS);
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977
	if (err_mask) {
978 979 980
		rc = -EIO;
		reason = "I/O error";

981 982
		if (err_mask & ~AC_ERR_DEV)
			goto err_out;
983

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		/*
		 * arg!  EDD works for all test cases, but seems to return
		 * the ATA signature for some ATAPI devices.  Until the
		 * reason for this is found and fixed, we fix up the mess
		 * here.  If IDENTIFY DEVICE returns command aborted
		 * (as ATAPI devices do), then we issue an
		 * IDENTIFY PACKET DEVICE.
		 *
		 * ATA software reset (SRST, the default) does not appear
		 * to have this problem.
		 */
995
		if ((using_edd) && (class == ATA_DEV_ATA)) {
996
			u8 err = tf.feature;
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			if (err & ATA_ABORTED) {
998
				class = ATA_DEV_ATAPI;
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				goto retry;
			}
		}
		goto err_out;
	}

1005
	swap_buf_le16(id, ATA_ID_WORDS);
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	/* print device capabilities */
	printk(KERN_DEBUG "ata%u: dev %u cfg "
	       "49:%04x 82:%04x 83:%04x 84:%04x 85:%04x 86:%04x 87:%04x 88:%04x\n",
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
	       ap->id, dev->devno,
	       id[49], id[82], id[83], id[84], id[85], id[86], id[87], id[88]);

	/* sanity check */
	if ((class == ATA_DEV_ATA) != ata_id_is_ata(id)) {
		rc = -EINVAL;
		reason = "device reports illegal type";
		goto err_out;
	}

	if (post_reset && class == ATA_DEV_ATA) {
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
		 * IDENTIFY
		 * INITIALIZE DEVICE PARAMETERS
		 * anything else..
		 * Some drives were very specific about that exact sequence.
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
			err_mask = ata_dev_init_params(ap, dev);
			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.
			 */
			post_reset = 0;
			goto retry;
		}
	}

	*p_class = class;
1046
	*p_id = id;
1047 1048 1049 1050 1051
	return 0;

 err_out:
	printk(KERN_WARNING "ata%u: dev %u failed to IDENTIFY (%s)\n",
	       ap->id, dev->devno, reason);
1052
	kfree(id);
1053 1054 1055
	return rc;
}

1056 1057 1058 1059 1060 1061
static inline u8 ata_dev_knobble(const struct ata_port *ap,
				 struct ata_device *dev)
{
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
}

1062
/**
1063 1064 1065
 *	ata_dev_configure - Configure the specified ATA/ATAPI device
 *	@ap: Port on which target device resides
 *	@dev: Target device to configure
1066
 *	@print_info: Enable device info printout
1067 1068 1069
 *
 *	Configure @dev according to @dev->id.  Generic and low-level
 *	driver specific fixups are also applied.
1070 1071
 *
 *	LOCKING:
1072 1073 1074 1075
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1076
 */
1077 1078
static int ata_dev_configure(struct ata_port *ap, struct ata_device *dev,
			     int print_info)
1079 1080 1081 1082 1083 1084
{
	unsigned long xfer_modes;
	int i, rc;

	if (!ata_dev_present(dev)) {
		DPRINTK("ENTER/EXIT (host %u, dev %u) -- nodev\n",
1085 1086
			ap->id, dev->devno);
		return 0;
1087 1088
	}

1089
	DPRINTK("ENTER, host %u, dev %u\n", ap->id, dev->devno);
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1091 1092 1093 1094 1095 1096 1097 1098 1099
	/* initialize to-be-configured parameters */
	dev->flags = 0;
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

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	/*
	 * common ATA, ATAPI feature tests
	 */

1104 1105 1106
	/* we require DMA support (bits 8 of word 49) */
	if (!ata_id_has_dma(dev->id)) {
		printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
1107
		rc = -EINVAL;
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		goto err_out_nosup;
	}

	/* quick-n-dirty find max transfer mode; for printk only */
	xfer_modes = dev->id[ATA_ID_UDMA_MODES];
	if (!xfer_modes)
		xfer_modes = (dev->id[ATA_ID_MWDMA_MODES]) << ATA_SHIFT_MWDMA;
1115 1116
	if (!xfer_modes)
		xfer_modes = ata_pio_modes(dev);
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1117

1118
	ata_dump_id(dev->id);
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	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1122 1123
		dev->n_sectors = ata_id_n_sectors(dev->id);

1124
		if (ata_id_has_lba(dev->id)) {
1125
			const char *lba_desc;
1126

1127 1128 1129
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
			if (ata_id_has_lba48(dev->id)) {
1130
				dev->flags |= ATA_DFLAG_LBA48;
1131 1132
				lba_desc = "LBA48";
			}
1133 1134

			/* print device info to dmesg */
1135 1136 1137 1138 1139 1140 1141 1142
			if (print_info)
				printk(KERN_INFO "ata%u: dev %u ATA-%d, "
				       "max %s, %Lu sectors: %s\n",
				       ap->id, dev->devno,
				       ata_id_major_version(dev->id),
				       ata_mode_string(xfer_modes),
				       (unsigned long long)dev->n_sectors,
				       lba_desc);
1143
		} else {
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
			/* CHS */

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

			if (ata_id_current_chs_valid(dev->id)) {
				/* Current CHS translation is valid. */
				dev->cylinders = dev->id[54];
				dev->heads     = dev->id[55];
				dev->sectors   = dev->id[56];
			}

			/* print device info to dmesg */
1159 1160 1161 1162 1163 1164 1165 1166
			if (print_info)
				printk(KERN_INFO "ata%u: dev %u ATA-%d, "
				       "max %s, %Lu sectors: CHS %u/%u/%u\n",
				       ap->id, dev->devno,
				       ata_id_major_version(dev->id),
				       ata_mode_string(xfer_modes),
				       (unsigned long long)dev->n_sectors,
				       dev->cylinders, dev->heads, dev->sectors);
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1167 1168
		}

1169
		dev->cdb_len = 16;
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1170 1171 1172
	}

	/* ATAPI-specific feature tests */
J
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1173
	else if (dev->class == ATA_DEV_ATAPI) {
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1174 1175 1176
		rc = atapi_cdb_len(dev->id);
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
			printk(KERN_WARNING "ata%u: unsupported CDB len\n", ap->id);
1177
			rc = -EINVAL;
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			goto err_out_nosup;
		}
1180
		dev->cdb_len = (unsigned int) rc;
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1181 1182

		/* print device info to dmesg */
1183 1184 1185
		if (print_info)
			printk(KERN_INFO "ata%u: dev %u ATAPI, max %s\n",
			       ap->id, dev->devno, ata_mode_string(xfer_modes));
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	}

1188 1189 1190 1191 1192 1193
	ap->host->max_cmd_len = 0;
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		ap->host->max_cmd_len = max_t(unsigned int,
					      ap->host->max_cmd_len,
					      ap->device[i].cdb_len);

1194 1195
	/* limit bridge transfers to udma5, 200 sectors */
	if (ata_dev_knobble(ap, dev)) {
1196 1197 1198
		if (print_info)
			printk(KERN_INFO "ata%u(%u): applying bridge limits\n",
			       ap->id, dev->devno);
1199 1200 1201 1202 1203 1204 1205
		ap->udma_mask &= ATA_UDMA5;
		dev->max_sectors = ATA_MAX_SECTORS;
	}

	if (ap->ops->dev_config)
		ap->ops->dev_config(ap, dev);

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	DPRINTK("EXIT, drv_stat = 0x%x\n", ata_chk_status(ap));
1207
	return 0;
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err_out_nosup:
	printk(KERN_WARNING "ata%u: dev %u not supported, ignoring\n",
1211
	       ap->id, dev->devno);
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	DPRINTK("EXIT, err\n");
1213
	return rc;
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}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
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 *	Master ATA bus probing function.  Initiates a hardware-dependent
 *	bus reset, then attempts to identify any devices found on
 *	the bus.
 *
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 *	LOCKING:
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 *	PCI/etc. bus probe sem.
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 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */

static int ata_bus_probe(struct ata_port *ap)
{
1233 1234
	unsigned int classes[ATA_MAX_DEVICES];
	unsigned int i, rc, found = 0;
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1236
	ata_port_probe(ap);
1237

1238 1239
	/* reset */
	if (ap->ops->probe_reset) {
1240
		rc = ap->ops->probe_reset(ap, classes);
1241 1242 1243
		if (rc) {
			printk("ata%u: reset failed (errno=%d)\n", ap->id, rc);
			return rc;
1244
		}
1245 1246 1247 1248 1249

		for (i = 0; i < ATA_MAX_DEVICES; i++)
			if (classes[i] == ATA_DEV_UNKNOWN)
				classes[i] = ATA_DEV_NONE;
	} else {
1250 1251
		ap->ops->phy_reset(ap);

1252 1253 1254 1255 1256 1257 1258 1259
		for (i = 0; i < ATA_MAX_DEVICES; i++) {
			if (!(ap->flags & ATA_FLAG_PORT_DISABLED))
				classes[i] = ap->device[i].class;
			else
				ap->device[i].class = ATA_DEV_UNKNOWN;
		}
		ata_port_probe(ap);
	}
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1261
	/* read IDENTIFY page and configure devices */
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	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1263 1264
		struct ata_device *dev = &ap->device[i];

1265 1266
		dev->class = classes[i];

1267 1268 1269 1270 1271 1272 1273 1274 1275
		if (!ata_dev_present(dev))
			continue;

		WARN_ON(dev->id != NULL);
		if (ata_dev_read_id(ap, dev, &dev->class, 1, &dev->id)) {
			dev->class = ATA_DEV_NONE;
			continue;
		}

1276
		if (ata_dev_configure(ap, dev, 1)) {
1277 1278
			dev->class++;	/* disable device */
			continue;
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		}
1280 1281

		found = 1;
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	}

1284
	if (!found)
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		goto err_out_disable;

	ata_set_mode(ap);
	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		goto err_out_disable;

	return 0;

err_out_disable:
	ap->ops->port_disable(ap);
	return -1;
}

/**
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 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
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 *
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 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
 *	LOCKING: host_set lock, or some other form of
 *	serialization.
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 */

void ata_port_probe(struct ata_port *ap)
{
	ap->flags &= ~ATA_FLAG_PORT_DISABLED;
}

1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
/**
 *	sata_print_link_status - Print SATA link status
 *	@ap: SATA port to printk link status about
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
static void sata_print_link_status(struct ata_port *ap)
{
	u32 sstatus, tmp;
	const char *speed;

	if (!ap->ops->scr_read)
		return;

	sstatus = scr_read(ap, SCR_STATUS);

	if (sata_dev_present(ap)) {
		tmp = (sstatus >> 4) & 0xf;
		if (tmp & (1 << 0))
			speed = "1.5";
		else if (tmp & (1 << 1))
			speed = "3.0";
		else
			speed = "<unknown>";
		printk(KERN_INFO "ata%u: SATA link up %s Gbps (SStatus %X)\n",
		       ap->id, speed, sstatus);
	} else {
		printk(KERN_INFO "ata%u: SATA link down (SStatus %X)\n",
		       ap->id, sstatus);
	}
}

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/**
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 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
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 *
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 *	This function issues commands to standard SATA Sxxx
 *	PHY registers, to wake up the phy (and device), and
 *	clear any reset condition.
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 *
 *	LOCKING:
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 *	PCI/etc. bus probe sem.
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 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1367 1368
		/* issue phy wake/reset */
		scr_write_flush(ap, SCR_CONTROL, 0x301);
1369 1370 1371
		/* Couldn't find anything in SATA I/II specs, but
		 * AHCI-1.1 10.4.2 says at least 1 ms. */
		mdelay(1);
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	}
1373
	scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */
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	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
		sstatus = scr_read(ap, SCR_STATUS);
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1383 1384
	/* print link status */
	sata_print_link_status(ap);
1385

1386 1387
	/* TODO: phy layer with polling, timeouts, etc. */
	if (sata_dev_present(ap))
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		ata_port_probe(ap);
1389
	else
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		ata_port_disable(ap);

	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
		ata_port_disable(ap);
		return;
	}

	ap->cbl = ATA_CBL_SATA;
}

/**
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 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
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 *
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 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
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 *
 *	LOCKING:
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 *	PCI/etc. bus probe sem.
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 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;
	ata_bus_reset(ap);
}

/**
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 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
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 *
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 *	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.
 *
 *	LOCKING: host_set lock, or some other form of
 *	serialization.
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 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
	ap->flags |= ATA_FLAG_PORT_DISABLED;
}

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/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
 * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
 * for PIO 5, which is a nonstandard extension and UDMA6, which
 * is currently supported only by Maxtor drives. 
 */

static const struct ata_timing ata_timing[] = {

	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },

	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
                                          
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
                                          
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },

/*	{ XFER_PIO_5,     20,  50,  30, 100,  50,  30, 100,   0 }, */
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },

	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },

/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */

	{ 0xFF }
};

#define ENOUGH(v,unit)		(((v)-1)/(unit)+1)
#define EZ(v,unit)		((v)?ENOUGH(v,unit):0)

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);
}

static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
{
	const struct ata_timing *t;

	for (t = ata_timing; t->mode != speed; t++)
A
Alan Cox 已提交
1520
		if (t->mode == 0xFF)
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1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
			return NULL;
	return t; 
}

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;

	/*
	 * Find the mode. 
1533
	 */
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1534 1535 1536 1537

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

1538 1539
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
	/*
	 * 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));
		if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
			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];
		} else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
			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.
	 */

1560
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
1561 1562

	/*
1563 1564 1565
	 * 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
1566 1567 1568 1569 1570 1571 1572 1573
	 */

	if (speed > XFER_PIO_4) {
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
1574
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589
	 */

	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;
	}

	return 0;
}

J
Jeff Garzik 已提交
1590
static const struct {
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1591 1592 1593 1594 1595 1596 1597 1598
	unsigned int shift;
	u8 base;
} xfer_mode_classes[] = {
	{ ATA_SHIFT_UDMA,	XFER_UDMA_0 },
	{ ATA_SHIFT_MWDMA,	XFER_MW_DMA_0 },
	{ ATA_SHIFT_PIO,	XFER_PIO_0 },
};

1599
static u8 base_from_shift(unsigned int shift)
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1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627
{
	int i;

	for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++)
		if (xfer_mode_classes[i].shift == shift)
			return xfer_mode_classes[i].base;

	return 0xff;
}

static void ata_dev_set_mode(struct ata_port *ap, struct ata_device *dev)
{
	int ofs, idx;
	u8 base;

	if (!ata_dev_present(dev) || (ap->flags & ATA_FLAG_PORT_DISABLED))
		return;

	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

	ata_dev_set_xfermode(ap, dev);

	base = base_from_shift(dev->xfer_shift);
	ofs = dev->xfer_mode - base;
	idx = ofs + dev->xfer_shift;
	WARN_ON(idx >= ARRAY_SIZE(xfer_mode_str));

1628 1629 1630 1631 1632 1633
	if (ata_dev_revalidate(ap, dev, 0)) {
		printk(KERN_ERR "ata%u: failed to revalidate after set "
		       "xfermode, disabled\n", ap->id);
		ata_port_disable(ap);
	}

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1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
	DPRINTK("idx=%d xfer_shift=%u, xfer_mode=0x%x, base=0x%x, offset=%d\n",
		idx, dev->xfer_shift, (int)dev->xfer_mode, (int)base, ofs);

	printk(KERN_INFO "ata%u: dev %u configured for %s\n",
		ap->id, dev->devno, xfer_mode_str[idx]);
}

static int ata_host_set_pio(struct ata_port *ap)
{
	unsigned int mask;
	int x, i;
	u8 base, xfer_mode;

	mask = ata_get_mode_mask(ap, ATA_SHIFT_PIO);
	x = fgb(mask);
	if (x < 0) {
		printk(KERN_WARNING "ata%u: no PIO support\n", ap->id);
		return -1;
	}

	base = base_from_shift(ATA_SHIFT_PIO);
	xfer_mode = base + x;

	DPRINTK("base 0x%x xfer_mode 0x%x mask 0x%x x %d\n",
		(int)base, (int)xfer_mode, mask, x);

	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
		if (ata_dev_present(dev)) {
			dev->pio_mode = xfer_mode;
			dev->xfer_mode = xfer_mode;
			dev->xfer_shift = ATA_SHIFT_PIO;
			if (ap->ops->set_piomode)
				ap->ops->set_piomode(ap, dev);
		}
	}

	return 0;
}

static void ata_host_set_dma(struct ata_port *ap, u8 xfer_mode,
			    unsigned int xfer_shift)
{
	int i;

	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
		if (ata_dev_present(dev)) {
			dev->dma_mode = xfer_mode;
			dev->xfer_mode = xfer_mode;
			dev->xfer_shift = xfer_shift;
			if (ap->ops->set_dmamode)
				ap->ops->set_dmamode(ap, dev);
		}
	}
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
 *
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 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).
 *
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 *	LOCKING:
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 *	PCI/etc. bus probe sem.
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 */
static void ata_set_mode(struct ata_port *ap)
{
1702
	unsigned int xfer_shift;
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1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
	u8 xfer_mode;
	int rc;

	/* step 1: always set host PIO timings */
	rc = ata_host_set_pio(ap);
	if (rc)
		goto err_out;

	/* step 2: choose the best data xfer mode */
	xfer_mode = xfer_shift = 0;
	rc = ata_choose_xfer_mode(ap, &xfer_mode, &xfer_shift);
	if (rc)
		goto err_out;

	/* step 3: if that xfer mode isn't PIO, set host DMA timings */
	if (xfer_shift != ATA_SHIFT_PIO)
		ata_host_set_dma(ap, xfer_mode, xfer_shift);

	/* step 4: update devices' xfer mode */
	ata_dev_set_mode(ap, &ap->device[0]);
	ata_dev_set_mode(ap, &ap->device[1]);

	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;

	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

	return;

err_out:
	ata_port_disable(ap);
}

1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756
/**
 *	ata_tf_to_host - issue ATA taskfile to host controller
 *	@ap: port to which command is being issued
 *	@tf: ATA taskfile register set
 *
 *	Issues ATA taskfile register set to ATA host controller,
 *	with proper synchronization with interrupt handler and
 *	other threads.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static inline void ata_tf_to_host(struct ata_port *ap,
				  const struct ata_taskfile *tf)
{
	ap->ops->tf_load(ap, tf);
	ap->ops->exec_command(ap, tf);
}

L
Linus Torvalds 已提交
1757 1758 1759 1760 1761 1762
/**
 *	ata_busy_sleep - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@tmout_pat: impatience timeout
 *	@tmout: overall timeout
 *
J
Jeff Garzik 已提交
1763 1764 1765 1766
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
 *	LOCKING: None.
L
Linus Torvalds 已提交
1767 1768
 */

1769 1770
unsigned int ata_busy_sleep (struct ata_port *ap,
			     unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

	if (status & ATA_BUSY)
		printk(KERN_WARNING "ata%u is slow to respond, "
		       "please be patient\n", ap->id);

	timeout = timer_start + tmout;
	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
		msleep(50);
		status = ata_chk_status(ap);
	}

	if (status & ATA_BUSY) {
		printk(KERN_ERR "ata%u failed to respond (%lu secs)\n",
		       ap->id, tmout / HZ);
		return 1;
	}

	return 0;
}

static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
	unsigned long timeout;

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
	if (dev0)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	/* if device 1 was found in ata_devchk, wait for
	 * register access, then wait for BSY to clear
	 */
	timeout = jiffies + ATA_TMOUT_BOOT;
	while (dev1) {
		u8 nsect, lbal;

		ap->ops->dev_select(ap, 1);
		if (ap->flags & ATA_FLAG_MMIO) {
			nsect = readb((void __iomem *) ioaddr->nsect_addr);
			lbal = readb((void __iomem *) ioaddr->lbal_addr);
		} else {
			nsect = inb(ioaddr->nsect_addr);
			lbal = inb(ioaddr->lbal_addr);
		}
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	/* is all this really necessary? */
	ap->ops->dev_select(ap, 0);
	if (dev1)
		ap->ops->dev_select(ap, 1);
	if (dev0)
		ap->ops->dev_select(ap, 0);
}

/**
J
Jeff Garzik 已提交
1850 1851 1852 1853 1854
 *	ata_bus_edd - Issue EXECUTE DEVICE DIAGNOSTIC command.
 *	@ap: Port to reset and probe
 *
 *	Use the EXECUTE DEVICE DIAGNOSTIC command to reset and
 *	probe the bus.  Not often used these days.
L
Linus Torvalds 已提交
1855 1856
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1857
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
1858
 *	Obtains host_set lock.
L
Linus Torvalds 已提交
1859 1860 1861 1862 1863 1864
 *
 */

static unsigned int ata_bus_edd(struct ata_port *ap)
{
	struct ata_taskfile tf;
J
Jeff Garzik 已提交
1865
	unsigned long flags;
L
Linus Torvalds 已提交
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875

	/* set up execute-device-diag (bus reset) taskfile */
	/* also, take interrupts to a known state (disabled) */
	DPRINTK("execute-device-diag\n");
	ata_tf_init(ap, &tf, 0);
	tf.ctl |= ATA_NIEN;
	tf.command = ATA_CMD_EDD;
	tf.protocol = ATA_PROT_NODATA;

	/* do bus reset */
J
Jeff Garzik 已提交
1876
	spin_lock_irqsave(&ap->host_set->lock, flags);
L
Linus Torvalds 已提交
1877
	ata_tf_to_host(ap, &tf);
J
Jeff Garzik 已提交
1878
	spin_unlock_irqrestore(&ap->host_set->lock, flags);
L
Linus Torvalds 已提交
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937

	/* spec says at least 2ms.  but who knows with those
	 * crazy ATAPI devices...
	 */
	msleep(150);

	return ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
}

static unsigned int ata_bus_softreset(struct ata_port *ap,
				      unsigned int devmask)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

	DPRINTK("ata%u: bus reset via SRST\n", ap->id);

	/* software reset.  causes dev0 to be selected */
	if (ap->flags & ATA_FLAG_MMIO) {
		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
		udelay(20);	/* FIXME: flush */
		writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
		udelay(20);	/* FIXME: flush */
		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
	} else {
		outb(ap->ctl, ioaddr->ctl_addr);
		udelay(10);
		outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
		udelay(10);
		outb(ap->ctl, ioaddr->ctl_addr);
	}

	/* spec mandates ">= 2ms" before checking status.
	 * We wait 150ms, because that was the magic delay used for
	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
	 * between when the ATA command register is written, and then
	 * status is checked.  Because waiting for "a while" before
	 * checking status is fine, post SRST, we perform this magic
	 * delay here as well.
	 */
	msleep(150);

	ata_bus_post_reset(ap, devmask);

	return 0;
}

/**
 *	ata_bus_reset - reset host port and associated ATA channel
 *	@ap: port to reset
 *
 *	This is typically the first time we actually start issuing
 *	commands to the ATA channel.  We wait for BSY to clear, then
 *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
 *	result.  Determine what devices, if any, are on the channel
 *	by looking at the device 0/1 error register.  Look at the signature
 *	stored in each device's taskfile registers, to determine if
 *	the device is ATA or ATAPI.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1938 1939
 *	PCI/etc. bus probe sem.
 *	Obtains host_set lock.
L
Linus Torvalds 已提交
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
 *
 *	SIDE EFFECTS:
 *	Sets ATA_FLAG_PORT_DISABLED if bus reset fails.
 */

void ata_bus_reset(struct ata_port *ap)
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
	unsigned int dev0, dev1 = 0, rc = 0, devmask = 0;

	DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);

	/* determine if device 0/1 are present */
	if (ap->flags & ATA_FLAG_SATA_RESET)
		dev0 = 1;
	else {
		dev0 = ata_devchk(ap, 0);
		if (slave_possible)
			dev1 = ata_devchk(ap, 1);
	}

	if (dev0)
		devmask |= (1 << 0);
	if (dev1)
		devmask |= (1 << 1);

	/* select device 0 again */
	ap->ops->dev_select(ap, 0);

	/* issue bus reset */
	if (ap->flags & ATA_FLAG_SRST)
		rc = ata_bus_softreset(ap, devmask);
	else if ((ap->flags & ATA_FLAG_SATA_RESET) == 0) {
		/* set up device control */
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
		else
			outb(ap->ctl, ioaddr->ctl_addr);
		rc = ata_bus_edd(ap);
	}

	if (rc)
		goto err_out;

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
1989
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
1990
	if ((slave_possible) && (err != 0x81))
1991
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

	/* re-enable interrupts */
	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
		ata_irq_on(ap);

	/* is double-select really necessary? */
	if (ap->device[1].class != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 1);
	if (ap->device[0].class != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
	if ((ap->device[0].class == ATA_DEV_NONE) &&
	    (ap->device[1].class == ATA_DEV_NONE))
		goto err_out;

	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
		/* set up device control for ATA_FLAG_SATA_RESET */
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
		else
			outb(ap->ctl, ioaddr->ctl_addr);
	}

	DPRINTK("EXIT\n");
	return;

err_out:
	printk(KERN_ERR "ata%u: disabling port\n", ap->id);
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
static int sata_phy_resume(struct ata_port *ap)
{
	unsigned long timeout = jiffies + (HZ * 5);
	u32 sstatus;

	scr_write_flush(ap, SCR_CONTROL, 0x300);

	/* Wait for phy to become ready, if necessary. */
	do {
		msleep(200);
		sstatus = scr_read(ap, SCR_STATUS);
		if ((sstatus & 0xf) != 1)
			return 0;
	} while (time_before(jiffies, timeout));

	return -1;
}

2044 2045 2046 2047 2048 2049
/**
 *	ata_std_probeinit - initialize probing
 *	@ap: port to be probed
 *
 *	@ap is about to be probed.  Initialize it.  This function is
 *	to be used as standard callback for ata_drive_probe_reset().
2050 2051 2052 2053 2054 2055
 *
 *	NOTE!!! Do not use this function as probeinit if a low level
 *	driver implements only hardreset.  Just pass NULL as probeinit
 *	in that case.  Using this function is probably okay but doing
 *	so makes reset sequence different from the original
 *	->phy_reset implementation and Jeff nervous.  :-P
2056 2057 2058
 */
extern void ata_std_probeinit(struct ata_port *ap)
{
2059
	if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read) {
2060
		sata_phy_resume(ap);
2061 2062 2063
		if (sata_dev_present(ap))
			ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
	}
2064 2065
}

2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@verbose: fail verbosely
 *	@classes: resulting classes of attached devices
 *
 *	Reset host port using ATA SRST.  This function is to be used
 *	as standard callback for ata_drive_*_reset() functions.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_std_softreset(struct ata_port *ap, int verbose, unsigned int *classes)
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

2089 2090 2091 2092 2093
	if (ap->ops->scr_read && !sata_dev_present(ap)) {
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
	/* determine if device 0/1 are present */
	if (ata_devchk(ap, 0))
		devmask |= (1 << 0);
	if (slave_possible && ata_devchk(ap, 1))
		devmask |= (1 << 1);

	/* select device 0 again */
	ap->ops->dev_select(ap, 0);

	/* issue bus reset */
	DPRINTK("about to softreset, devmask=%x\n", devmask);
	err_mask = ata_bus_softreset(ap, devmask);
	if (err_mask) {
		if (verbose)
			printk(KERN_ERR "ata%u: SRST failed (err_mask=0x%x)\n",
			       ap->id, err_mask);
		else
			DPRINTK("EXIT, softreset failed (err_mask=0x%x)\n",
				err_mask);
		return -EIO;
	}

	/* determine by signature whether we have ATA or ATAPI devices */
	classes[0] = ata_dev_try_classify(ap, 0, &err);
	if (slave_possible && err != 0x81)
		classes[1] = ata_dev_try_classify(ap, 1, &err);

2121
 out:
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
 *	@ap: port to reset
 *	@verbose: fail verbosely
 *	@class: resulting class of attached device
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *	This function is to be used as standard callback for
 *	ata_drive_*_reset().
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int sata_std_hardreset(struct ata_port *ap, int verbose, unsigned int *class)
{
	DPRINTK("ENTER\n");

	/* Issue phy wake/reset */
	scr_write_flush(ap, SCR_CONTROL, 0x301);

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

2155 2156
	/* Bring phy back */
	sata_phy_resume(ap);
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173

	/* TODO: phy layer with polling, timeouts, etc. */
	if (!sata_dev_present(ap)) {
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
		if (verbose)
			printk(KERN_ERR "ata%u: COMRESET failed "
			       "(device not ready)\n", ap->id);
		else
			DPRINTK("EXIT, device not ready\n");
		return -EIO;
	}

2174 2175
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200
	*class = ata_dev_try_classify(ap, 0, NULL);

	DPRINTK("EXIT, class=%u\n", *class);
	return 0;
}

/**
 *	ata_std_postreset - standard postreset callback
 *	@ap: the target ata_port
 *	@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.
 *
 *	This function is to be used as standard callback for
 *	ata_drive_*_reset().
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
{
	DPRINTK("ENTER\n");

2201
	/* set cable type if it isn't already set */
2202 2203 2204 2205 2206 2207 2208
	if (ap->cbl == ATA_CBL_NONE && ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

	/* print link status */
	if (ap->cbl == ATA_CBL_SATA)
		sata_print_link_status(ap);

2209 2210 2211
	/* re-enable interrupts */
	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
		ata_irq_on(ap);
2212 2213 2214 2215 2216 2217 2218

	/* is double-select really necessary? */
	if (classes[0] != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 1);
	if (classes[1] != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 0);

2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231
	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		DPRINTK("EXIT, no device\n");
		return;
	}

	/* set up device control */
	if (ap->ioaddr.ctl_addr) {
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
		else
			outb(ap->ctl, ap->ioaddr.ctl_addr);
	}
2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253

	DPRINTK("EXIT\n");
}

/**
 *	ata_std_probe_reset - standard probe reset method
 *	@ap: prot to perform probe-reset
 *	@classes: resulting classes of attached devices
 *
 *	The stock off-the-shelf ->probe_reset method.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_std_probe_reset(struct ata_port *ap, unsigned int *classes)
{
	ata_reset_fn_t hardreset;

	hardreset = NULL;
2254
	if (ap->flags & ATA_FLAG_SATA && ap->ops->scr_read)
2255 2256
		hardreset = sata_std_hardreset;

2257
	return ata_drive_probe_reset(ap, ata_std_probeinit,
2258
				     ata_std_softreset, hardreset,
2259 2260 2261
				     ata_std_postreset, classes);
}

2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
static int do_probe_reset(struct ata_port *ap, ata_reset_fn_t reset,
			  ata_postreset_fn_t postreset,
			  unsigned int *classes)
{
	int i, rc;

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		classes[i] = ATA_DEV_UNKNOWN;

	rc = reset(ap, 0, classes);
	if (rc)
		return rc;

	/* If any class isn't ATA_DEV_UNKNOWN, consider classification
	 * is complete and convert all ATA_DEV_UNKNOWN to
	 * ATA_DEV_NONE.
	 */
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (classes[i] != ATA_DEV_UNKNOWN)
			break;

	if (i < ATA_MAX_DEVICES)
		for (i = 0; i < ATA_MAX_DEVICES; i++)
			if (classes[i] == ATA_DEV_UNKNOWN)
				classes[i] = ATA_DEV_NONE;

	if (postreset)
		postreset(ap, classes);

	return classes[0] != ATA_DEV_UNKNOWN ? 0 : -ENODEV;
}

/**
 *	ata_drive_probe_reset - Perform probe reset with given methods
 *	@ap: port to reset
2297
 *	@probeinit: probeinit method (can be NULL)
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
 *	@softreset: softreset method (can be NULL)
 *	@hardreset: hardreset method (can be NULL)
 *	@postreset: postreset method (can be NULL)
 *	@classes: resulting classes of attached devices
 *
 *	Reset the specified port and classify attached devices using
 *	given methods.  This function prefers softreset but tries all
 *	possible reset sequences to reset and classify devices.  This
 *	function is intended to be used for constructing ->probe_reset
 *	callback by low level drivers.
 *
 *	Reset methods should follow the following rules.
 *
 *	- Return 0 on sucess, -errno on failure.
 *	- If classification is supported, fill classes[] with
 *	  recognized class codes.
 *	- If classification is not supported, leave classes[] alone.
 *	- If verbose is non-zero, print error message on failure;
 *	  otherwise, shut up.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -EINVAL if no reset method is avaliable, -ENODEV
 *	if classification fails, and any error code from reset
 *	methods.
 */
2326
int ata_drive_probe_reset(struct ata_port *ap, ata_probeinit_fn_t probeinit,
2327 2328 2329 2330 2331
			  ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
			  ata_postreset_fn_t postreset, unsigned int *classes)
{
	int rc = -EINVAL;

2332 2333 2334
	if (probeinit)
		probeinit(ap);

2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
	if (softreset) {
		rc = do_probe_reset(ap, softreset, postreset, classes);
		if (rc == 0)
			return 0;
	}

	if (!hardreset)
		return rc;

	rc = do_probe_reset(ap, hardreset, postreset, classes);
	if (rc == 0 || rc != -ENODEV)
		return rc;

	if (softreset)
		rc = do_probe_reset(ap, softreset, postreset, classes);

	return rc;
}

2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467
/**
 *	ata_dev_same_device - Determine whether new ID matches configured device
 *	@ap: port on which the device to compare against resides
 *	@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.
 */
static int ata_dev_same_device(struct ata_port *ap, struct ata_device *dev,
			       unsigned int new_class, const u16 *new_id)
{
	const u16 *old_id = dev->id;
	unsigned char model[2][41], serial[2][21];
	u64 new_n_sectors;

	if (dev->class != new_class) {
		printk(KERN_INFO
		       "ata%u: dev %u class mismatch %d != %d\n",
		       ap->id, dev->devno, dev->class, new_class);
		return 0;
	}

	ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
		printk(KERN_INFO
		       "ata%u: dev %u model number mismatch '%s' != '%s'\n",
		       ap->id, dev->devno, model[0], model[1]);
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
		printk(KERN_INFO
		       "ata%u: dev %u serial number mismatch '%s' != '%s'\n",
		       ap->id, dev->devno, serial[0], serial[1]);
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
		printk(KERN_INFO
		       "ata%u: dev %u n_sectors mismatch %llu != %llu\n",
		       ap->id, dev->devno, (unsigned long long)dev->n_sectors,
		       (unsigned long long)new_n_sectors);
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@ap: port on which the device to revalidate resides
 *	@dev: device to revalidate
 *	@post_reset: is this revalidation after reset?
 *
 *	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
 */
int ata_dev_revalidate(struct ata_port *ap, struct ata_device *dev,
		       int post_reset)
{
	unsigned int class;
	u16 *id;
	int rc;

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

	class = dev->class;
	id = NULL;

	/* allocate & read ID data */
	rc = ata_dev_read_id(ap, dev, &class, post_reset, &id);
	if (rc)
		goto fail;

	/* is the device still there? */
	if (!ata_dev_same_device(ap, dev, class, id)) {
		rc = -ENODEV;
		goto fail;
	}

	kfree(dev->id);
	dev->id = id;

	/* configure device according to the new ID */
	return ata_dev_configure(ap, dev, 0);

 fail:
	printk(KERN_ERR "ata%u: dev %u revalidation failed (errno=%d)\n",
	       ap->id, dev->devno, rc);
	kfree(id);
	return rc;
}

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static void ata_pr_blacklisted(const struct ata_port *ap,
			       const struct ata_device *dev)
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{
	printk(KERN_WARNING "ata%u: dev %u is on DMA blacklist, disabling DMA\n",
		ap->id, dev->devno);
}

2475
static const char * const ata_dma_blacklist [] = {
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	"WDC AC11000H",
	"WDC AC22100H",
	"WDC AC32500H",
	"WDC AC33100H",
	"WDC AC31600H",
	"WDC AC32100H",
	"WDC AC23200L",
	"Compaq CRD-8241B",
	"CRD-8400B",
	"CRD-8480B",
	"CRD-8482B",
 	"CRD-84",
	"SanDisk SDP3B",
	"SanDisk SDP3B-64",
	"SANYO CD-ROM CRD",
	"HITACHI CDR-8",
	"HITACHI CDR-8335",
	"HITACHI CDR-8435",
	"Toshiba CD-ROM XM-6202B",
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	"TOSHIBA CD-ROM XM-1702BC",
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	"CD-532E-A",
	"E-IDE CD-ROM CR-840",
	"CD-ROM Drive/F5A",
	"WPI CDD-820",
	"SAMSUNG CD-ROM SC-148C",
	"SAMSUNG CD-ROM SC",
	"SanDisk SDP3B-64",
	"ATAPI CD-ROM DRIVE 40X MAXIMUM",
	"_NEC DV5800A",
};

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static int ata_dma_blacklisted(const struct ata_device *dev)
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{
2509
	unsigned char model_num[41];
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	int i;

2512
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
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	for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i++)
2515
		if (!strcmp(ata_dma_blacklist[i], model_num))
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			return 1;

	return 0;
}

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static unsigned int ata_get_mode_mask(const struct ata_port *ap, int shift)
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{
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	const struct ata_device *master, *slave;
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	unsigned int mask;

	master = &ap->device[0];
	slave = &ap->device[1];

2529
	WARN_ON(!ata_dev_present(master) && !ata_dev_present(slave));
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	if (shift == ATA_SHIFT_UDMA) {
		mask = ap->udma_mask;
		if (ata_dev_present(master)) {
			mask &= (master->id[ATA_ID_UDMA_MODES] & 0xff);
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			if (ata_dma_blacklisted(master)) {
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				mask = 0;
				ata_pr_blacklisted(ap, master);
			}
		}
		if (ata_dev_present(slave)) {
			mask &= (slave->id[ATA_ID_UDMA_MODES] & 0xff);
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			if (ata_dma_blacklisted(slave)) {
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				mask = 0;
				ata_pr_blacklisted(ap, slave);
			}
		}
	}
	else if (shift == ATA_SHIFT_MWDMA) {
		mask = ap->mwdma_mask;
		if (ata_dev_present(master)) {
			mask &= (master->id[ATA_ID_MWDMA_MODES] & 0x07);
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			if (ata_dma_blacklisted(master)) {
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				mask = 0;
				ata_pr_blacklisted(ap, master);
			}
		}
		if (ata_dev_present(slave)) {
			mask &= (slave->id[ATA_ID_MWDMA_MODES] & 0x07);
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			if (ata_dma_blacklisted(slave)) {
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				mask = 0;
				ata_pr_blacklisted(ap, slave);
			}
		}
	}
	else if (shift == ATA_SHIFT_PIO) {
		mask = ap->pio_mask;
		if (ata_dev_present(master)) {
			/* spec doesn't return explicit support for
			 * PIO0-2, so we fake it
			 */
			u16 tmp_mode = master->id[ATA_ID_PIO_MODES] & 0x03;
			tmp_mode <<= 3;
			tmp_mode |= 0x7;
			mask &= tmp_mode;
		}
		if (ata_dev_present(slave)) {
			/* spec doesn't return explicit support for
			 * PIO0-2, so we fake it
			 */
			u16 tmp_mode = slave->id[ATA_ID_PIO_MODES] & 0x03;
			tmp_mode <<= 3;
			tmp_mode |= 0x7;
			mask &= tmp_mode;
		}
	}
	else {
		mask = 0xffffffff; /* shut up compiler warning */
		BUG();
	}

	return mask;
}

/* find greatest bit */
static int fgb(u32 bitmap)
{
	unsigned int i;
	int x = -1;

	for (i = 0; i < 32; i++)
		if (bitmap & (1 << i))
			x = i;

	return x;
}

/**
 *	ata_choose_xfer_mode - attempt to find best transfer mode
 *	@ap: Port for which an xfer mode will be selected
 *	@xfer_mode_out: (output) SET FEATURES - XFER MODE code
 *	@xfer_shift_out: (output) bit shift that selects this mode
 *
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 *	Based on host and device capabilities, determine the
 *	maximum transfer mode that is amenable to all.
 *
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 *	LOCKING:
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 *	PCI/etc. bus probe sem.
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 *
 *	RETURNS:
 *	Zero on success, negative on error.
 */

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static int ata_choose_xfer_mode(const struct ata_port *ap,
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				u8 *xfer_mode_out,
				unsigned int *xfer_shift_out)
{
	unsigned int mask, shift;
	int x, i;

	for (i = 0; i < ARRAY_SIZE(xfer_mode_classes); i++) {
		shift = xfer_mode_classes[i].shift;
		mask = ata_get_mode_mask(ap, shift);

		x = fgb(mask);
		if (x >= 0) {
			*xfer_mode_out = xfer_mode_classes[i].base + x;
			*xfer_shift_out = shift;
			return 0;
		}
	}

	return -1;
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@ap: Port associated with device @dev
 *	@dev: Device to which command will be sent
 *
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 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
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 *	LOCKING:
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 *	PCI/etc. bus probe sem.
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 */

static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
{
2659
	struct ata_taskfile tf;
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	/* set up set-features taskfile */
	DPRINTK("set features - xfer mode\n");

2664 2665 2666 2667 2668 2669
	ata_tf_init(ap, &tf, dev->devno);
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
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2671 2672 2673
	if (ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0)) {
		printk(KERN_ERR "ata%u: failed to set xfermode, disabled\n",
		       ap->id);
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		ata_port_disable(ap);
2675
	}
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	DPRINTK("EXIT\n");
}

2680 2681 2682 2683 2684 2685
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@ap: Port associated with device @dev
 *	@dev: Device to which command will be sent
 *
 *	LOCKING:
2686 2687 2688 2689
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
2690 2691
 */

2692 2693
static unsigned int ata_dev_init_params(struct ata_port *ap,
					struct ata_device *dev)
2694
{
2695
	struct ata_taskfile tf;
2696
	unsigned int err_mask;
2697 2698 2699 2700 2701
	u16 sectors = dev->id[6];
	u16 heads   = dev->id[3];

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
2702
		return 0;
2703 2704 2705 2706

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

2707 2708 2709 2710 2711 2712
	ata_tf_init(ap, &tf, dev->devno);
	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 */
2713

2714
	err_mask = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
2715

2716 2717
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
2718 2719
}

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/**
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 *	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.
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 *
 *	LOCKING:
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 *	spin_lock_irqsave(host_set lock)
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 */

static void ata_sg_clean(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
2733
	struct scatterlist *sg = qc->__sg;
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	int dir = qc->dma_dir;
2735
	void *pad_buf = NULL;
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2737 2738
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
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	if (qc->flags & ATA_QCFLAG_SINGLE)
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		WARN_ON(qc->n_elem > 1);
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	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
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2745 2746 2747 2748 2749 2750 2751 2752
	/* if we padded the buffer out to 32-bit bound, and data
	 * xfer direction is from-device, we must copy from the
	 * pad buffer back into the supplied buffer
	 */
	if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
		pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);

	if (qc->flags & ATA_QCFLAG_SG) {
2753 2754
		if (qc->n_elem)
			dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
2755 2756 2757 2758 2759 2760
		/* restore last sg */
		sg[qc->orig_n_elem - 1].length += qc->pad_len;
		if (pad_buf) {
			struct scatterlist *psg = &qc->pad_sgent;
			void *addr = kmap_atomic(psg->page, KM_IRQ0);
			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
2761
			kunmap_atomic(addr, KM_IRQ0);
2762 2763
		}
	} else {
2764
		if (qc->n_elem)
2765 2766 2767
			dma_unmap_single(ap->host_set->dev,
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
2768 2769 2770 2771 2772 2773
		/* restore sg */
		sg->length += qc->pad_len;
		if (pad_buf)
			memcpy(qc->buf_virt + sg->length - qc->pad_len,
			       pad_buf, qc->pad_len);
	}
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	qc->flags &= ~ATA_QCFLAG_DMAMAP;
2776
	qc->__sg = NULL;
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}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
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 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
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 *	LOCKING:
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 *	spin_lock_irqsave(host_set lock)
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 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
2793 2794
	struct scatterlist *sg;
	unsigned int idx;
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2796
	WARN_ON(qc->__sg == NULL);
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	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
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	idx = 0;
2800
	ata_for_each_sg(sg, qc) {
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		u32 addr, offset;
		u32 sg_len, len;

		/* determine if physical DMA addr spans 64K boundary.
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);

		while (sg_len) {
			offset = addr & 0xffff;
			len = sg_len;
			if ((offset + sg_len) > 0x10000)
				len = 0x10000 - offset;

			ap->prd[idx].addr = cpu_to_le32(addr);
			ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);

			idx++;
			sg_len -= len;
			addr += len;
		}
	}

	if (idx)
		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
}
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
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 *	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.
 *
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 *	LOCKING:
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 *	spin_lock_irqsave(host_set lock)
 *
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 *	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;
	int rc = 0; /* Assume ATAPI DMA is OK by default */

	if (ap->ops->check_atapi_dma)
		rc = ap->ops->check_atapi_dma(qc);

	return rc;
}
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
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 *	Prepare ATA taskfile for submission.
 *
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 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

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/**
 *	ata_sg_init_one - Associate command with memory buffer
 *	@qc: Command to be associated
 *	@buf: Memory buffer
 *	@buflen: Length of memory buffer, in bytes.
 *
 *	Initialize the data-related elements of queued_cmd @qc
 *	to point to a single memory buffer, @buf of byte length @buflen.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

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Linus Torvalds 已提交
2884 2885 2886 2887 2888 2889 2890
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	struct scatterlist *sg;

	qc->flags |= ATA_QCFLAG_SINGLE;

	memset(&qc->sgent, 0, sizeof(qc->sgent));
2891
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
2892
	qc->n_elem = 1;
2893
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
2894 2895
	qc->buf_virt = buf;

2896
	sg = qc->__sg;
J
Jeff Garzik 已提交
2897
	sg_init_one(sg, buf, buflen);
L
Linus Torvalds 已提交
2898 2899
}

J
Jeff Garzik 已提交
2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913
/**
 *	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_set lock)
 */

L
Linus Torvalds 已提交
2914 2915 2916 2917
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
2918
	qc->__sg = sg;
L
Linus Torvalds 已提交
2919
	qc->n_elem = n_elem;
2920
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
2921 2922 2923
}

/**
J
Jeff Garzik 已提交
2924 2925 2926 2927
 *	ata_sg_setup_one - DMA-map the memory buffer associated with a command.
 *	@qc: Command with memory buffer to be mapped.
 *
 *	DMA-map the memory buffer associated with queued_cmd @qc.
L
Linus Torvalds 已提交
2928 2929 2930 2931 2932
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
J
Jeff Garzik 已提交
2933
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
2934 2935 2936 2937 2938 2939
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
2940
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
2941
	dma_addr_t dma_address;
2942
	int trim_sg = 0;
L
Linus Torvalds 已提交
2943

2944 2945 2946 2947 2948 2949
	/* we must lengthen transfers to end on a 32-bit boundary */
	qc->pad_len = sg->length & 3;
	if (qc->pad_len) {
		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;

2950
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		if (qc->tf.flags & ATA_TFLAG_WRITE)
			memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
			       qc->pad_len);

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim sg */
		sg->length -= qc->pad_len;
2962 2963
		if (sg->length == 0)
			trim_sg = 1;
2964 2965 2966 2967 2968

		DPRINTK("padding done, sg->length=%u pad_len=%u\n",
			sg->length, qc->pad_len);
	}

2969 2970
	if (trim_sg) {
		qc->n_elem--;
2971 2972 2973
		goto skip_map;
	}

L
Linus Torvalds 已提交
2974
	dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
2975
				     sg->length, dir);
2976 2977 2978
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
2979
		return -1;
2980
	}
L
Linus Torvalds 已提交
2981 2982

	sg_dma_address(sg) = dma_address;
2983
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
2984

2985
skip_map:
L
Linus Torvalds 已提交
2986 2987 2988 2989 2990 2991 2992
	DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
		qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

	return 0;
}

/**
J
Jeff Garzik 已提交
2993 2994 2995 2996
 *	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.
L
Linus Torvalds 已提交
2997 2998 2999 3000 3001
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3002
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3003 3004 3005 3006 3007 3008
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3009 3010
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3011
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3012 3013

	VPRINTK("ENTER, ata%u\n", ap->id);
3014
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3015

3016 3017 3018 3019 3020 3021 3022
	/* we must lengthen transfers to end on a 32-bit boundary */
	qc->pad_len = lsg->length & 3;
	if (qc->pad_len) {
		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
		struct scatterlist *psg = &qc->pad_sgent;
		unsigned int offset;

3023
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037

		memset(pad_buf, 0, ATA_DMA_PAD_SZ);

		/*
		 * psg->page/offset are used to copy to-be-written
		 * data in this function or read data in ata_sg_clean.
		 */
		offset = lsg->offset + lsg->length - qc->pad_len;
		psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
		psg->offset = offset_in_page(offset);

		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			void *addr = kmap_atomic(psg->page, KM_IRQ0);
			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
3038
			kunmap_atomic(addr, KM_IRQ0);
3039 3040 3041 3042 3043 3044
		}

		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
		/* trim last sg */
		lsg->length -= qc->pad_len;
3045 3046
		if (lsg->length == 0)
			trim_sg = 1;
3047 3048 3049 3050 3051

		DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
			qc->n_elem - 1, lsg->length, qc->pad_len);
	}

3052 3053 3054 3055 3056 3057 3058 3059 3060
	pre_n_elem = qc->n_elem;
	if (trim_sg && pre_n_elem)
		pre_n_elem--;

	if (!pre_n_elem) {
		n_elem = 0;
		goto skip_map;
	}

L
Linus Torvalds 已提交
3061
	dir = qc->dma_dir;
3062
	n_elem = dma_map_sg(ap->host_set->dev, sg, pre_n_elem, dir);
3063 3064 3065
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3066
		return -1;
3067
	}
L
Linus Torvalds 已提交
3068 3069 3070

	DPRINTK("%d sg elements mapped\n", n_elem);

3071
skip_map:
L
Linus Torvalds 已提交
3072 3073 3074 3075 3076
	qc->n_elem = n_elem;

	return 0;
}

3077 3078 3079
/**
 *	ata_poll_qc_complete - turn irq back on and finish qc
 *	@qc: Command to complete
R
Randy Dunlap 已提交
3080
 *	@err_mask: ATA status register content
3081 3082 3083 3084 3085
 *
 *	LOCKING:
 *	None.  (grabs host lock)
 */

3086
void ata_poll_qc_complete(struct ata_queued_cmd *qc)
3087 3088
{
	struct ata_port *ap = qc->ap;
J
Jeff Garzik 已提交
3089
	unsigned long flags;
3090

J
Jeff Garzik 已提交
3091
	spin_lock_irqsave(&ap->host_set->lock, flags);
3092 3093
	ap->flags &= ~ATA_FLAG_NOINTR;
	ata_irq_on(ap);
3094
	ata_qc_complete(qc);
J
Jeff Garzik 已提交
3095
	spin_unlock_irqrestore(&ap->host_set->lock, flags);
3096 3097
}

L
Linus Torvalds 已提交
3098
/**
3099
 *	ata_pio_poll - poll using PIO, depending on current state
R
Randy Dunlap 已提交
3100
 *	@ap: the target ata_port
L
Linus Torvalds 已提交
3101 3102
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3103
 *	None.  (executing in kernel thread context)
L
Linus Torvalds 已提交
3104 3105
 *
 *	RETURNS:
R
Randy Dunlap 已提交
3106
 *	timeout value to use
L
Linus Torvalds 已提交
3107 3108 3109 3110
 */

static unsigned long ata_pio_poll(struct ata_port *ap)
{
3111
	struct ata_queued_cmd *qc;
L
Linus Torvalds 已提交
3112
	u8 status;
A
Albert Lee 已提交
3113 3114 3115
	unsigned int poll_state = HSM_ST_UNKNOWN;
	unsigned int reg_state = HSM_ST_UNKNOWN;

3116
	qc = ata_qc_from_tag(ap, ap->active_tag);
3117
	WARN_ON(qc == NULL);
3118

A
Albert Lee 已提交
3119 3120 3121 3122 3123
	switch (ap->hsm_task_state) {
	case HSM_ST:
	case HSM_ST_POLL:
		poll_state = HSM_ST_POLL;
		reg_state = HSM_ST;
L
Linus Torvalds 已提交
3124
		break;
A
Albert Lee 已提交
3125 3126 3127 3128
	case HSM_ST_LAST:
	case HSM_ST_LAST_POLL:
		poll_state = HSM_ST_LAST_POLL;
		reg_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3129 3130 3131 3132 3133 3134 3135 3136 3137
		break;
	default:
		BUG();
		break;
	}

	status = ata_chk_status(ap);
	if (status & ATA_BUSY) {
		if (time_after(jiffies, ap->pio_task_timeout)) {
3138
			qc->err_mask |= AC_ERR_TIMEOUT;
3139
			ap->hsm_task_state = HSM_ST_TMOUT;
L
Linus Torvalds 已提交
3140 3141
			return 0;
		}
A
Albert Lee 已提交
3142
		ap->hsm_task_state = poll_state;
L
Linus Torvalds 已提交
3143 3144 3145
		return ATA_SHORT_PAUSE;
	}

A
Albert Lee 已提交
3146
	ap->hsm_task_state = reg_state;
L
Linus Torvalds 已提交
3147 3148 3149 3150
	return 0;
}

/**
R
Randy Dunlap 已提交
3151 3152
 *	ata_pio_complete - check if drive is busy or idle
 *	@ap: the target ata_port
L
Linus Torvalds 已提交
3153 3154
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3155
 *	None.  (executing in kernel thread context)
J
Jeff Garzik 已提交
3156 3157 3158
 *
 *	RETURNS:
 *	Non-zero if qc completed, zero otherwise.
L
Linus Torvalds 已提交
3159 3160
 */

J
Jeff Garzik 已提交
3161
static int ata_pio_complete (struct ata_port *ap)
L
Linus Torvalds 已提交
3162 3163 3164 3165 3166
{
	struct ata_queued_cmd *qc;
	u8 drv_stat;

	/*
A
Alan Cox 已提交
3167 3168 3169 3170
	 * This is purely heuristic.  This is a fast path.  Sometimes when
	 * we enter, BSY will be cleared in a chk-status or two.  If not,
	 * the drive is probably seeking or something.  Snooze for a couple
	 * msecs, then chk-status again.  If still busy, fall back to
A
Albert Lee 已提交
3171
	 * HSM_ST_POLL state.
L
Linus Torvalds 已提交
3172
	 */
A
Albert Lee 已提交
3173 3174
	drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
	if (drv_stat & ATA_BUSY) {
L
Linus Torvalds 已提交
3175
		msleep(2);
A
Albert Lee 已提交
3176 3177
		drv_stat = ata_busy_wait(ap, ATA_BUSY, 10);
		if (drv_stat & ATA_BUSY) {
A
Albert Lee 已提交
3178
			ap->hsm_task_state = HSM_ST_LAST_POLL;
L
Linus Torvalds 已提交
3179
			ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
J
Jeff Garzik 已提交
3180
			return 0;
L
Linus Torvalds 已提交
3181 3182 3183
		}
	}

3184
	qc = ata_qc_from_tag(ap, ap->active_tag);
3185
	WARN_ON(qc == NULL);
3186

L
Linus Torvalds 已提交
3187 3188
	drv_stat = ata_wait_idle(ap);
	if (!ata_ok(drv_stat)) {
3189
		qc->err_mask |= __ac_err_mask(drv_stat);
A
Albert Lee 已提交
3190
		ap->hsm_task_state = HSM_ST_ERR;
J
Jeff Garzik 已提交
3191
		return 0;
L
Linus Torvalds 已提交
3192 3193
	}

A
Albert Lee 已提交
3194
	ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
3195

3196
	WARN_ON(qc->err_mask);
3197
	ata_poll_qc_complete(qc);
J
Jeff Garzik 已提交
3198 3199 3200 3201

	/* another command may start at this point */

	return 1;
L
Linus Torvalds 已提交
3202 3203
}

E
Edward Falk 已提交
3204 3205

/**
3206
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3207 3208 3209 3210 3211 3212 3213 3214
 *	@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:
R
Randy Dunlap 已提交
3215
 *	Inherited from caller.
E
Edward Falk 已提交
3216
 */
L
Linus Torvalds 已提交
3217 3218 3219 3220 3221 3222 3223 3224 3225 3226
void swap_buf_le16(u16 *buf, unsigned int buf_words)
{
#ifdef __BIG_ENDIAN
	unsigned int i;

	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
}

A
Albert Lee 已提交
3227 3228 3229 3230 3231
/**
 *	ata_mmio_data_xfer - Transfer data by MMIO
 *	@ap: port to read/write
 *	@buf: data buffer
 *	@buflen: buffer length
3232
 *	@write_data: read/write
A
Albert Lee 已提交
3233 3234 3235 3236 3237 3238 3239
 *
 *	Transfer data from/to the device data register by MMIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3240 3241 3242 3243 3244 3245 3246 3247
static void ata_mmio_data_xfer(struct ata_port *ap, unsigned char *buf,
			       unsigned int buflen, int write_data)
{
	unsigned int i;
	unsigned int words = buflen >> 1;
	u16 *buf16 = (u16 *) buf;
	void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;

A
Albert Lee 已提交
3248
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3249 3250 3251 3252 3253 3254 3255
	if (write_data) {
		for (i = 0; i < words; i++)
			writew(le16_to_cpu(buf16[i]), mmio);
	} else {
		for (i = 0; i < words; i++)
			buf16[i] = cpu_to_le16(readw(mmio));
	}
A
Albert Lee 已提交
3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
		u16 align_buf[1] = { 0 };
		unsigned char *trailing_buf = buf + buflen - 1;

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
			writew(le16_to_cpu(align_buf[0]), mmio);
		} else {
			align_buf[0] = cpu_to_le16(readw(mmio));
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3270 3271
}

A
Albert Lee 已提交
3272 3273 3274 3275 3276
/**
 *	ata_pio_data_xfer - Transfer data by PIO
 *	@ap: port to read/write
 *	@buf: data buffer
 *	@buflen: buffer length
3277
 *	@write_data: read/write
A
Albert Lee 已提交
3278 3279 3280 3281 3282 3283 3284
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3285 3286 3287
static void ata_pio_data_xfer(struct ata_port *ap, unsigned char *buf,
			      unsigned int buflen, int write_data)
{
A
Albert Lee 已提交
3288
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3289

A
Albert Lee 已提交
3290
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3291
	if (write_data)
A
Albert Lee 已提交
3292
		outsw(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3293
	else
A
Albert Lee 已提交
3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308
		insw(ap->ioaddr.data_addr, buf, words);

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
		u16 align_buf[1] = { 0 };
		unsigned char *trailing_buf = buf + buflen - 1;

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
			outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
		} else {
			align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3309 3310
}

A
Albert Lee 已提交
3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323
/**
 *	ata_data_xfer - Transfer data from/to the data register.
 *	@ap: port to read/write
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@do_write: read/write
 *
 *	Transfer data from/to the device data register.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3324 3325 3326
static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
			  unsigned int buflen, int do_write)
{
3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341
	/* Make the crap hardware pay the costs not the good stuff */
	if (unlikely(ap->flags & ATA_FLAG_IRQ_MASK)) {
		unsigned long flags;
		local_irq_save(flags);
		if (ap->flags & ATA_FLAG_MMIO)
			ata_mmio_data_xfer(ap, buf, buflen, do_write);
		else
			ata_pio_data_xfer(ap, buf, buflen, do_write);
		local_irq_restore(flags);
	} else {
		if (ap->flags & ATA_FLAG_MMIO)
			ata_mmio_data_xfer(ap, buf, buflen, do_write);
		else
			ata_pio_data_xfer(ap, buf, buflen, do_write);
	}
L
Linus Torvalds 已提交
3342 3343
}

A
Albert Lee 已提交
3344 3345 3346 3347 3348 3349 3350 3351 3352 3353
/**
 *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
 *	@qc: Command on going
 *
 *	Transfer ATA_SECT_SIZE of data from/to the ATA device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3354 3355 3356
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3357
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3358 3359 3360 3361 3362 3363
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

	if (qc->cursect == (qc->nsect - 1))
A
Albert Lee 已提交
3364
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377

	page = sg[qc->cursg].page;
	offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

	buf = kmap(page) + offset;

	qc->cursect++;
	qc->cursg_ofs++;

3378
	if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

	/* do the actual data transfer */
	do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
	ata_data_xfer(ap, buf, ATA_SECT_SIZE, do_write);

	kunmap(page);
}

A
Albert Lee 已提交
3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403
/**
 *	__atapi_pio_bytes - Transfer data from/to the ATAPI device.
 *	@qc: Command on going
 *	@bytes: number of bytes
 *
 *	Transfer Transfer data from/to the ATAPI device.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 */

L
Linus Torvalds 已提交
3404 3405 3406
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3407
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3408 3409 3410 3411 3412
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

3413
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
3414
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3415 3416

next_sg:
3417
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
3418
		/*
3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429
		 * The end of qc->sg is reached and the device expects
		 * more data to transfer. In order not to overrun qc->sg
		 * and fulfill length specified in the byte count register,
		 *    - for read case, discard trailing data from the device
		 *    - for write case, padding zero data to the device
		 */
		u16 pad_buf[1] = { 0 };
		unsigned int words = bytes >> 1;
		unsigned int i;

		if (words) /* warning if bytes > 1 */
J
Jeff Garzik 已提交
3430
			printk(KERN_WARNING "ata%u: %u bytes trailing data\n",
3431 3432 3433 3434 3435
			       ap->id, bytes);

		for (i = 0; i < words; i++)
			ata_data_xfer(ap, (unsigned char*)pad_buf, 2, do_write);

A
Albert Lee 已提交
3436
		ap->hsm_task_state = HSM_ST_LAST;
3437 3438 3439
		return;
	}

3440
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
3441 3442 3443 3444 3445 3446 3447 3448

	page = sg->page;
	offset = sg->offset + qc->cursg_ofs;

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

3449
	/* don't overrun current sg */
3450
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
3451 3452 3453 3454 3455 3456 3457 3458 3459 3460

	/* don't cross page boundaries */
	count = min(count, (unsigned int)PAGE_SIZE - offset);

	buf = kmap(page) + offset;

	bytes -= count;
	qc->curbytes += count;
	qc->cursg_ofs += count;

3461
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

	/* do the actual data transfer */
	ata_data_xfer(ap, buf, count, do_write);

	kunmap(page);

3473
	if (bytes)
L
Linus Torvalds 已提交
3474 3475 3476
		goto next_sg;
}

A
Albert Lee 已提交
3477 3478 3479 3480 3481 3482 3483 3484 3485 3486
/**
 *	atapi_pio_bytes - Transfer data from/to the ATAPI device.
 *	@qc: Command on going
 *
 *	Transfer Transfer data from/to the ATAPI device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515
static void atapi_pio_bytes(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *dev = qc->dev;
	unsigned int ireason, bc_lo, bc_hi, bytes;
	int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;

	ap->ops->tf_read(ap, &qc->tf);
	ireason = qc->tf.nsect;
	bc_lo = qc->tf.lbam;
	bc_hi = qc->tf.lbah;
	bytes = (bc_hi << 8) | bc_lo;

	/* shall be cleared to zero, indicating xfer of data */
	if (ireason & (1 << 0))
		goto err_out;

	/* make sure transfer direction matches expected */
	i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
	if (do_write != i_write)
		goto err_out;

	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
	printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
	      ap->id, dev->devno);
3516
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
3517
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
3518 3519 3520
}

/**
R
Randy Dunlap 已提交
3521 3522
 *	ata_pio_block - start PIO on a block
 *	@ap: the target ata_port
L
Linus Torvalds 已提交
3523 3524
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3525
 *	None.  (executing in kernel thread context)
L
Linus Torvalds 已提交
3526 3527 3528 3529 3530 3531 3532 3533
 */

static void ata_pio_block(struct ata_port *ap)
{
	struct ata_queued_cmd *qc;
	u8 status;

	/*
R
Randy Dunlap 已提交
3534
	 * This is purely heuristic.  This is a fast path.
L
Linus Torvalds 已提交
3535 3536 3537 3538
	 * Sometimes when we enter, BSY will be cleared in
	 * a chk-status or two.  If not, the drive is probably seeking
	 * or something.  Snooze for a couple msecs, then
	 * chk-status again.  If still busy, fall back to
A
Albert Lee 已提交
3539
	 * HSM_ST_POLL state.
L
Linus Torvalds 已提交
3540 3541 3542 3543 3544 3545
	 */
	status = ata_busy_wait(ap, ATA_BUSY, 5);
	if (status & ATA_BUSY) {
		msleep(2);
		status = ata_busy_wait(ap, ATA_BUSY, 10);
		if (status & ATA_BUSY) {
A
Albert Lee 已提交
3546
			ap->hsm_task_state = HSM_ST_POLL;
L
Linus Torvalds 已提交
3547 3548 3549 3550 3551 3552
			ap->pio_task_timeout = jiffies + ATA_TMOUT_PIO;
			return;
		}
	}

	qc = ata_qc_from_tag(ap, ap->active_tag);
3553
	WARN_ON(qc == NULL);
L
Linus Torvalds 已提交
3554

A
Albert Lee 已提交
3555 3556 3557 3558 3559 3560 3561 3562
	/* check error */
	if (status & (ATA_ERR | ATA_DF)) {
		qc->err_mask |= AC_ERR_DEV;
		ap->hsm_task_state = HSM_ST_ERR;
		return;
	}

	/* transfer data if any */
L
Linus Torvalds 已提交
3563
	if (is_atapi_taskfile(&qc->tf)) {
A
Albert Lee 已提交
3564
		/* DRQ=0 means no more data to transfer */
L
Linus Torvalds 已提交
3565
		if ((status & ATA_DRQ) == 0) {
A
Albert Lee 已提交
3566
			ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3567 3568 3569 3570 3571 3572 3573
			return;
		}

		atapi_pio_bytes(qc);
	} else {
		/* handle BSY=0, DRQ=0 as error */
		if ((status & ATA_DRQ) == 0) {
3574
			qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
3575
			ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
3576 3577 3578 3579 3580 3581 3582 3583 3584 3585
			return;
		}

		ata_pio_sector(qc);
	}
}

static void ata_pio_error(struct ata_port *ap)
{
	struct ata_queued_cmd *qc;
3586

L
Linus Torvalds 已提交
3587
	qc = ata_qc_from_tag(ap, ap->active_tag);
3588
	WARN_ON(qc == NULL);
L
Linus Torvalds 已提交
3589

3590 3591 3592
	if (qc->tf.command != ATA_CMD_PACKET)
		printk(KERN_WARNING "ata%u: PIO error\n", ap->id);

3593 3594 3595
	/* make sure qc->err_mask is available to 
	 * know what's wrong and recover
	 */
3596
	WARN_ON(qc->err_mask == 0);
3597

A
Albert Lee 已提交
3598
	ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
3599

3600
	ata_poll_qc_complete(qc);
L
Linus Torvalds 已提交
3601 3602 3603 3604 3605
}

static void ata_pio_task(void *_data)
{
	struct ata_port *ap = _data;
J
Jeff Garzik 已提交
3606 3607 3608 3609 3610 3611
	unsigned long timeout;
	int qc_completed;

fsm_start:
	timeout = 0;
	qc_completed = 0;
L
Linus Torvalds 已提交
3612

A
Albert Lee 已提交
3613 3614
	switch (ap->hsm_task_state) {
	case HSM_ST_IDLE:
L
Linus Torvalds 已提交
3615 3616
		return;

A
Albert Lee 已提交
3617
	case HSM_ST:
L
Linus Torvalds 已提交
3618 3619 3620
		ata_pio_block(ap);
		break;

A
Albert Lee 已提交
3621
	case HSM_ST_LAST:
J
Jeff Garzik 已提交
3622
		qc_completed = ata_pio_complete(ap);
L
Linus Torvalds 已提交
3623 3624
		break;

A
Albert Lee 已提交
3625 3626
	case HSM_ST_POLL:
	case HSM_ST_LAST_POLL:
L
Linus Torvalds 已提交
3627 3628 3629
		timeout = ata_pio_poll(ap);
		break;

A
Albert Lee 已提交
3630 3631
	case HSM_ST_TMOUT:
	case HSM_ST_ERR:
L
Linus Torvalds 已提交
3632 3633 3634 3635 3636
		ata_pio_error(ap);
		return;
	}

	if (timeout)
3637
		ata_queue_delayed_pio_task(ap, timeout);
J
Jeff Garzik 已提交
3638 3639
	else if (!qc_completed)
		goto fsm_start;
L
Linus Torvalds 已提交
3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657
}

/**
 *	ata_qc_timeout - Handle timeout of queued command
 *	@qc: Command that timed out
 *
 *	Some part of the kernel (currently, only the SCSI layer)
 *	has noticed that the active command on port @ap has not
 *	completed after a specified length of time.  Handle this
 *	condition by disabling DMA (if necessary) and completing
 *	transactions, with error if necessary.
 *
 *	This also handles the case of the "lost interrupt", where
 *	for some reason (possibly hardware bug, possibly driver bug)
 *	an interrupt was not delivered to the driver, even though the
 *	transaction completed successfully.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3658
 *	Inherited from SCSI layer (none, can sleep)
L
Linus Torvalds 已提交
3659 3660 3661 3662 3663
 */

static void ata_qc_timeout(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
J
Jeff Garzik 已提交
3664
	struct ata_host_set *host_set = ap->host_set;
L
Linus Torvalds 已提交
3665
	u8 host_stat = 0, drv_stat;
J
Jeff Garzik 已提交
3666
	unsigned long flags;
L
Linus Torvalds 已提交
3667 3668 3669

	DPRINTK("ENTER\n");

3670 3671 3672
	ata_flush_pio_tasks(ap);
	ap->hsm_task_state = HSM_ST_IDLE;

J
Jeff Garzik 已提交
3673 3674
	spin_lock_irqsave(&host_set->lock, flags);

L
Linus Torvalds 已提交
3675 3676 3677 3678 3679 3680 3681
	switch (qc->tf.protocol) {

	case ATA_PROT_DMA:
	case ATA_PROT_ATAPI_DMA:
		host_stat = ap->ops->bmdma_status(ap);

		/* before we do anything else, clear DMA-Start bit */
3682
		ap->ops->bmdma_stop(qc);
L
Linus Torvalds 已提交
3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696

		/* fall through */

	default:
		ata_altstatus(ap);
		drv_stat = ata_chk_status(ap);

		/* ack bmdma irq events */
		ap->ops->irq_clear(ap);

		printk(KERN_ERR "ata%u: command 0x%x timeout, stat 0x%x host_stat 0x%x\n",
		       ap->id, qc->tf.command, drv_stat, host_stat);

		/* complete taskfile transaction */
3697
		qc->err_mask |= ac_err_mask(drv_stat);
L
Linus Torvalds 已提交
3698 3699
		break;
	}
J
Jeff Garzik 已提交
3700 3701 3702

	spin_unlock_irqrestore(&host_set->lock, flags);

3703 3704
	ata_eh_qc_complete(qc);

L
Linus Torvalds 已提交
3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
	DPRINTK("EXIT\n");
}

/**
 *	ata_eng_timeout - Handle timeout of queued command
 *	@ap: Port on which timed-out command is active
 *
 *	Some part of the kernel (currently, only the SCSI layer)
 *	has noticed that the active command on port @ap has not
 *	completed after a specified length of time.  Handle this
 *	condition by disabling DMA (if necessary) and completing
 *	transactions, with error if necessary.
 *
 *	This also handles the case of the "lost interrupt", where
 *	for some reason (possibly hardware bug, possibly driver bug)
 *	an interrupt was not delivered to the driver, even though the
 *	transaction completed successfully.
 *
 *	LOCKING:
 *	Inherited from SCSI layer (none, can sleep)
 */

void ata_eng_timeout(struct ata_port *ap)
{
	DPRINTK("ENTER\n");

3731
	ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
L
Linus Torvalds 已提交
3732 3733 3734 3735 3736 3737 3738 3739 3740 3741

	DPRINTK("EXIT\n");
}

/**
 *	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
3742
 *	None.
L
Linus Torvalds 已提交
3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767
 */

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

	for (i = 0; i < ATA_MAX_QUEUE; i++)
		if (!test_and_set_bit(i, &ap->qactive)) {
			qc = ata_qc_from_tag(ap, i);
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

/**
 *	ata_qc_new_init - Request an available ATA command, and initialize it
 *	@ap: Port associated with device @dev
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3768
 *	None.
L
Linus Torvalds 已提交
3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781
 */

struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
				      struct ata_device *dev)
{
	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
3782
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795
	}

	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
3796
 *	spin_lock_irqsave(host_set lock)
L
Linus Torvalds 已提交
3797 3798 3799
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
3800 3801 3802
	struct ata_port *ap = qc->ap;
	unsigned int tag;

3803
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
3804

3805 3806 3807 3808 3809 3810 3811 3812
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		if (tag == ap->active_tag)
			ap->active_tag = ATA_TAG_POISON;
		qc->tag = ATA_TAG_POISON;
		clear_bit(tag, &ap->qactive);
	}
L
Linus Torvalds 已提交
3813 3814
}

3815
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3816
{
3817 3818
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
3819 3820 3821 3822

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

3823 3824 3825 3826 3827 3828
	/* 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;

L
Linus Torvalds 已提交
3829
	/* call completion callback */
3830
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869
}

static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
	case ATA_PROT_DMA:
	case ATA_PROT_ATAPI_DMA:
		return 1;

	case ATA_PROT_ATAPI:
	case ATA_PROT_PIO:
	case ATA_PROT_PIO_MULT:
		if (ap->flags & ATA_FLAG_PIO_DMA)
			return 1;

		/* fall through */

	default:
		return 0;
	}

	/* never reached */
}

/**
 *	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:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
3870
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
3871 3872
 */

3873
unsigned int ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3874 3875 3876 3877 3878 3879
{
	struct ata_port *ap = qc->ap;

	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
3880
				goto sg_err;
L
Linus Torvalds 已提交
3881 3882
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
3883
				goto sg_err;
L
Linus Torvalds 已提交
3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

	qc->ap->active_tag = qc->tag;
	qc->flags |= ATA_QCFLAG_ACTIVE;

	return ap->ops->qc_issue(qc);

3896 3897
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3898
	return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
3899 3900
}

E
Edward Falk 已提交
3901

L
Linus Torvalds 已提交
3902 3903 3904 3905 3906 3907 3908 3909 3910
/**
 *	ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
 *	@qc: command to issue to device
 *
 *	Using various libata functions and hooks, this function
 *	starts an ATA command.  ATA commands are grouped into
 *	classes called "protocols", and issuing each type of protocol
 *	is slightly different.
 *
E
Edward Falk 已提交
3911 3912
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
3913 3914 3915 3916
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
3917
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
3918 3919
 */

3920
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3921 3922 3923 3924 3925 3926 3927
{
	struct ata_port *ap = qc->ap;

	ata_dev_select(ap, qc->dev->devno, 1, 0);

	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
J
Jeff Garzik 已提交
3928
		ata_tf_to_host(ap, &qc->tf);
L
Linus Torvalds 已提交
3929 3930 3931 3932 3933 3934 3935 3936 3937 3938
		break;

	case ATA_PROT_DMA:
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
		ap->ops->bmdma_start(qc);	    /* initiate bmdma */
		break;

	case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
		ata_qc_set_polling(qc);
J
Jeff Garzik 已提交
3939
		ata_tf_to_host(ap, &qc->tf);
A
Albert Lee 已提交
3940
		ap->hsm_task_state = HSM_ST;
3941
		ata_queue_pio_task(ap);
L
Linus Torvalds 已提交
3942 3943 3944 3945
		break;

	case ATA_PROT_ATAPI:
		ata_qc_set_polling(qc);
J
Jeff Garzik 已提交
3946
		ata_tf_to_host(ap, &qc->tf);
3947
		ata_queue_packet_task(ap);
L
Linus Torvalds 已提交
3948 3949 3950
		break;

	case ATA_PROT_ATAPI_NODATA:
3951
		ap->flags |= ATA_FLAG_NOINTR;
J
Jeff Garzik 已提交
3952
		ata_tf_to_host(ap, &qc->tf);
3953
		ata_queue_packet_task(ap);
L
Linus Torvalds 已提交
3954 3955 3956
		break;

	case ATA_PROT_ATAPI_DMA:
3957
		ap->flags |= ATA_FLAG_NOINTR;
L
Linus Torvalds 已提交
3958 3959
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
3960
		ata_queue_packet_task(ap);
L
Linus Torvalds 已提交
3961 3962 3963 3964
		break;

	default:
		WARN_ON(1);
3965
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
3966 3967 3968 3969 3970 3971
	}

	return 0;
}

/**
E
Edward Falk 已提交
3972
 *	ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
L
Linus Torvalds 已提交
3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001
 *	@qc: Info associated with this ATA transaction.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
	u8 dmactl;
	void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;

	/* load PRD table addr. */
	mb();	/* make sure PRD table writes are visible to controller */
	writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);

	/* specify data direction, triple-check start bit is clear */
	dmactl = readb(mmio + ATA_DMA_CMD);
	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
	if (!rw)
		dmactl |= ATA_DMA_WR;
	writeb(dmactl, mmio + ATA_DMA_CMD);

	/* issue r/w command */
	ap->ops->exec_command(ap, &qc->tf);
}

/**
4002
 *	ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
L
Linus Torvalds 已提交
4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078
 *	@qc: Info associated with this ATA transaction.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
	u8 dmactl;

	/* start host DMA transaction */
	dmactl = readb(mmio + ATA_DMA_CMD);
	writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);

	/* Strictly, one may wish to issue a readb() here, to
	 * flush the mmio write.  However, control also passes
	 * to the hardware at this point, and it will interrupt
	 * us when we are to resume control.  So, in effect,
	 * we don't care when the mmio write flushes.
	 * Further, a read of the DMA status register _immediately_
	 * following the write may not be what certain flaky hardware
	 * is expected, so I think it is best to not add a readb()
	 * without first all the MMIO ATA cards/mobos.
	 * Or maybe I'm just being paranoid.
	 */
}

/**
 *	ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
 *	@qc: Info associated with this ATA transaction.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
	u8 dmactl;

	/* load PRD table addr. */
	outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);

	/* specify data direction, triple-check start bit is clear */
	dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
	if (!rw)
		dmactl |= ATA_DMA_WR;
	outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);

	/* issue r/w command */
	ap->ops->exec_command(ap, &qc->tf);
}

/**
 *	ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
 *	@qc: Info associated with this ATA transaction.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	u8 dmactl;

	/* start host DMA transaction */
	dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
	outb(dmactl | ATA_DMA_START,
	     ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
}

E
Edward Falk 已提交
4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090

/**
 *	ata_bmdma_start - Start a PCI IDE BMDMA transaction
 *	@qc: Info associated with this ATA transaction.
 *
 *	Writes the ATA_DMA_START flag to the DMA command register.
 *
 *	May be used as the bmdma_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */
L
Linus Torvalds 已提交
4091 4092 4093 4094 4095 4096 4097 4098
void ata_bmdma_start(struct ata_queued_cmd *qc)
{
	if (qc->ap->flags & ATA_FLAG_MMIO)
		ata_bmdma_start_mmio(qc);
	else
		ata_bmdma_start_pio(qc);
}

E
Edward Falk 已提交
4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112

/**
 *	ata_bmdma_setup - Set up PCI IDE BMDMA transaction
 *	@qc: Info associated with this ATA transaction.
 *
 *	Writes address of PRD table to device's PRD Table Address
 *	register, sets the DMA control register, and calls
 *	ops->exec_command() to start the transfer.
 *
 *	May be used as the bmdma_setup() entry in ata_port_operations.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */
L
Linus Torvalds 已提交
4113 4114 4115 4116 4117 4118 4119 4120
void ata_bmdma_setup(struct ata_queued_cmd *qc)
{
	if (qc->ap->flags & ATA_FLAG_MMIO)
		ata_bmdma_setup_mmio(qc);
	else
		ata_bmdma_setup_pio(qc);
}

E
Edward Falk 已提交
4121 4122 4123

/**
 *	ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
J
Jeff Garzik 已提交
4124
 *	@ap: Port associated with this ATA transaction.
E
Edward Falk 已提交
4125 4126 4127 4128 4129 4130 4131 4132 4133
 *
 *	Clear interrupt and error flags in DMA status register.
 *
 *	May be used as the irq_clear() entry in ata_port_operations.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

L
Linus Torvalds 已提交
4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145
void ata_bmdma_irq_clear(struct ata_port *ap)
{
    if (ap->flags & ATA_FLAG_MMIO) {
        void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
        writeb(readb(mmio), mmio);
    } else {
        unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
        outb(inb(addr), addr);
    }

}

E
Edward Falk 已提交
4146 4147 4148

/**
 *	ata_bmdma_status - Read PCI IDE BMDMA status
J
Jeff Garzik 已提交
4149
 *	@ap: Port associated with this ATA transaction.
E
Edward Falk 已提交
4150 4151 4152 4153 4154 4155 4156 4157 4158
 *
 *	Read and return BMDMA status register.
 *
 *	May be used as the bmdma_status() entry in ata_port_operations.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

L
Linus Torvalds 已提交
4159 4160 4161 4162 4163 4164 4165
u8 ata_bmdma_status(struct ata_port *ap)
{
	u8 host_stat;
	if (ap->flags & ATA_FLAG_MMIO) {
		void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
		host_stat = readb(mmio + ATA_DMA_STATUS);
	} else
4166
		host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
L
Linus Torvalds 已提交
4167 4168 4169
	return host_stat;
}

E
Edward Falk 已提交
4170 4171 4172

/**
 *	ata_bmdma_stop - Stop PCI IDE BMDMA transfer
4173
 *	@qc: Command we are ending DMA for
E
Edward Falk 已提交
4174 4175 4176 4177 4178 4179 4180 4181 4182
 *
 *	Clears the ATA_DMA_START flag in the dma control register
 *
 *	May be used as the bmdma_stop() entry in ata_port_operations.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

4183
void ata_bmdma_stop(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4184
{
4185
	struct ata_port *ap = qc->ap;
L
Linus Torvalds 已提交
4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236
	if (ap->flags & ATA_FLAG_MMIO) {
		void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;

		/* clear start/stop bit */
		writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
			mmio + ATA_DMA_CMD);
	} else {
		/* clear start/stop bit */
		outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
			ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
	}

	/* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
	ata_altstatus(ap);        /* dummy read */
}

/**
 *	ata_host_intr - Handle host interrupt for given (port, task)
 *	@ap: Port on which interrupt arrived (possibly...)
 *	@qc: Taskfile currently active in engine
 *
 *	Handle host interrupt for given queued command.  Currently,
 *	only DMA interrupts are handled.  All other commands are
 *	handled via polling with interrupts disabled (nIEN bit).
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	One if interrupt was handled, zero if not (shared irq).
 */

inline unsigned int ata_host_intr (struct ata_port *ap,
				   struct ata_queued_cmd *qc)
{
	u8 status, host_stat;

	switch (qc->tf.protocol) {

	case ATA_PROT_DMA:
	case ATA_PROT_ATAPI_DMA:
	case ATA_PROT_ATAPI:
		/* check status of DMA engine */
		host_stat = ap->ops->bmdma_status(ap);
		VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);

		/* if it's not our irq... */
		if (!(host_stat & ATA_DMA_INTR))
			goto idle_irq;

		/* before we do anything else, clear DMA-Start bit */
4237
		ap->ops->bmdma_stop(qc);
L
Linus Torvalds 已提交
4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258

		/* fall through */

	case ATA_PROT_ATAPI_NODATA:
	case ATA_PROT_NODATA:
		/* check altstatus */
		status = ata_altstatus(ap);
		if (status & ATA_BUSY)
			goto idle_irq;

		/* check main status, clearing INTRQ */
		status = ata_chk_status(ap);
		if (unlikely(status & ATA_BUSY))
			goto idle_irq;
		DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
			ap->id, qc->tf.protocol, status);

		/* ack bmdma irq events */
		ap->ops->irq_clear(ap);

		/* complete taskfile transaction */
4259 4260
		qc->err_mask |= ac_err_mask(status);
		ata_qc_complete(qc);
L
Linus Torvalds 已提交
4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283
		break;

	default:
		goto idle_irq;
	}

	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
		handled = 1;
		ata_irq_ack(ap, 0); /* debug trap */
		printk(KERN_WARNING "ata%d: irq trap\n", ap->id);
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
4284 4285
 *	@irq: irq line (unused)
 *	@dev_instance: pointer to our ata_host_set information structure
L
Linus Torvalds 已提交
4286 4287
 *	@regs: unused
 *
J
Jeff Garzik 已提交
4288 4289 4290
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
4291
 *	LOCKING:
J
Jeff Garzik 已提交
4292
 *	Obtains host_set lock during operation.
L
Linus Torvalds 已提交
4293 4294
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4295
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311
 */

irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
{
	struct ata_host_set *host_set = dev_instance;
	unsigned int i;
	unsigned int handled = 0;
	unsigned long flags;

	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
	spin_lock_irqsave(&host_set->lock, flags);

	for (i = 0; i < host_set->n_ports; i++) {
		struct ata_port *ap;

		ap = host_set->ports[i];
4312 4313
		if (ap &&
		    !(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
L
Linus Torvalds 已提交
4314 4315 4316
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
4317 4318
			if (qc && (!(qc->tf.ctl & ATA_NIEN)) &&
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348
				handled |= ata_host_intr(ap, qc);
		}
	}

	spin_unlock_irqrestore(&host_set->lock, flags);

	return IRQ_RETVAL(handled);
}

/**
 *	atapi_packet_task - Write CDB bytes to hardware
 *	@_data: Port to which ATAPI device is attached.
 *
 *	When device has indicated its readiness to accept
 *	a CDB, this function is called.  Send the CDB.
 *	If DMA is to be performed, exit immediately.
 *	Otherwise, we are in polling mode, so poll
 *	status under operation succeeds or fails.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */

static void atapi_packet_task(void *_data)
{
	struct ata_port *ap = _data;
	struct ata_queued_cmd *qc;
	u8 status;

	qc = ata_qc_from_tag(ap, ap->active_tag);
4349 4350
	WARN_ON(qc == NULL);
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4351 4352 4353

	/* sleep-wait for BSY to clear */
	DPRINTK("busy wait\n");
4354
	if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
4355
		qc->err_mask |= AC_ERR_TIMEOUT;
4356 4357
		goto err_out;
	}
L
Linus Torvalds 已提交
4358 4359 4360

	/* make sure DRQ is set */
	status = ata_chk_status(ap);
4361
	if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
4362
		qc->err_mask |= AC_ERR_HSM;
L
Linus Torvalds 已提交
4363
		goto err_out;
4364
	}
L
Linus Torvalds 已提交
4365 4366 4367

	/* send SCSI cdb */
	DPRINTK("send cdb\n");
4368
	WARN_ON(qc->dev->cdb_len < 12);
L
Linus Torvalds 已提交
4369

4370 4371 4372
	if (qc->tf.protocol == ATA_PROT_ATAPI_DMA ||
	    qc->tf.protocol == ATA_PROT_ATAPI_NODATA) {
		unsigned long flags;
L
Linus Torvalds 已提交
4373

4374 4375 4376 4377 4378 4379 4380 4381
		/* Once we're done issuing command and kicking bmdma,
		 * irq handler takes over.  To not lose irq, we need
		 * to clear NOINTR flag before sending cdb, but
		 * interrupt handler shouldn't be invoked before we're
		 * finished.  Hence, the following locking.
		 */
		spin_lock_irqsave(&ap->host_set->lock, flags);
		ap->flags &= ~ATA_FLAG_NOINTR;
4382
		ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
4383 4384 4385 4386
		if (qc->tf.protocol == ATA_PROT_ATAPI_DMA)
			ap->ops->bmdma_start(qc);	/* initiate bmdma */
		spin_unlock_irqrestore(&ap->host_set->lock, flags);
	} else {
4387
		ata_data_xfer(ap, qc->cdb, qc->dev->cdb_len, 1);
L
Linus Torvalds 已提交
4388

4389
		/* PIO commands are handled by polling */
A
Albert Lee 已提交
4390
		ap->hsm_task_state = HSM_ST;
4391
		ata_queue_pio_task(ap);
L
Linus Torvalds 已提交
4392 4393 4394 4395 4396
	}

	return;

err_out:
4397
	ata_poll_qc_complete(qc);
L
Linus Torvalds 已提交
4398 4399
}

E
Edward Falk 已提交
4400

J
Jens Axboe 已提交
4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451
/*
 * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
 * without filling any other registers
 */
static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
			     u8 cmd)
{
	struct ata_taskfile tf;
	int err;

	ata_tf_init(ap, &tf, dev->devno);

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

	err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
	if (err)
		printk(KERN_ERR "%s: ata command failed: %d\n",
				__FUNCTION__, err);

	return err;
}

static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
{
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

	if (ata_id_has_flush_ext(dev->id))
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

	return ata_do_simple_cmd(ap, dev, cmd);
}

static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
{
	return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
}

static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
{
	return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
}

/**
 *	ata_device_resume - wakeup a previously suspended devices
4452 4453
 *	@ap: port the device is connected to
 *	@dev: the device to resume
J
Jens Axboe 已提交
4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475
 *
 *	Kick the drive back into action, by sending it an idle immediate
 *	command and making sure its transfer mode matches between drive
 *	and host.
 *
 */
int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
{
	if (ap->flags & ATA_FLAG_SUSPENDED) {
		ap->flags &= ~ATA_FLAG_SUSPENDED;
		ata_set_mode(ap);
	}
	if (!ata_dev_present(dev))
		return 0;
	if (dev->class == ATA_DEV_ATA)
		ata_start_drive(ap, dev);

	return 0;
}

/**
 *	ata_device_suspend - prepare a device for suspend
4476 4477
 *	@ap: port the device is connected to
 *	@dev: the device to suspend
J
Jens Axboe 已提交
4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493
 *
 *	Flush the cache on the drive, if appropriate, then issue a
 *	standbynow command.
 */
int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
{
	if (!ata_dev_present(dev))
		return 0;
	if (dev->class == ATA_DEV_ATA)
		ata_flush_cache(ap, dev);

	ata_standby_drive(ap, dev);
	ap->flags |= ATA_FLAG_SUSPENDED;
	return 0;
}

4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506
/**
 *	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.
 */

L
Linus Torvalds 已提交
4507 4508 4509
int ata_port_start (struct ata_port *ap)
{
	struct device *dev = ap->host_set->dev;
4510
	int rc;
L
Linus Torvalds 已提交
4511 4512 4513 4514 4515

	ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
	if (!ap->prd)
		return -ENOMEM;

4516 4517
	rc = ata_pad_alloc(ap, dev);
	if (rc) {
4518
		dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4519
		return rc;
4520 4521
	}

L
Linus Torvalds 已提交
4522 4523 4524 4525 4526
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);

	return 0;
}

E
Edward Falk 已提交
4527 4528 4529 4530 4531 4532 4533 4534 4535 4536

/**
 *	ata_port_stop - Undo ata_port_start()
 *	@ap: Port to shut down
 *
 *	Frees the PRD table.
 *
 *	May be used as the port_stop() entry in ata_port_operations.
 *
 *	LOCKING:
R
Randy Dunlap 已提交
4537
 *	Inherited from caller.
E
Edward Falk 已提交
4538 4539
 */

L
Linus Torvalds 已提交
4540 4541 4542 4543 4544
void ata_port_stop (struct ata_port *ap)
{
	struct device *dev = ap->host_set->dev;

	dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
4545
	ata_pad_free(ap, dev);
L
Linus Torvalds 已提交
4546 4547
}

J
Jeff Garzik 已提交
4548 4549 4550 4551 4552 4553 4554
void ata_host_stop (struct ata_host_set *host_set)
{
	if (host_set->mmio_base)
		iounmap(host_set->mmio_base);
}


L
Linus Torvalds 已提交
4555 4556 4557 4558 4559 4560
/**
 *	ata_host_remove - Unregister SCSI host structure with upper layers
 *	@ap: Port to unregister
 *	@do_unregister: 1 if we fully unregister, 0 to just stop the port
 *
 *	LOCKING:
R
Randy Dunlap 已提交
4561
 *	Inherited from caller.
L
Linus Torvalds 已提交
4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583
 */

static void ata_host_remove(struct ata_port *ap, unsigned int do_unregister)
{
	struct Scsi_Host *sh = ap->host;

	DPRINTK("ENTER\n");

	if (do_unregister)
		scsi_remove_host(sh);

	ap->ops->port_stop(ap);
}

/**
 *	ata_host_init - Initialize an ata_port structure
 *	@ap: Structure to initialize
 *	@host: associated SCSI mid-layer structure
 *	@host_set: Collection of hosts to which @ap belongs
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
J
Jeff Garzik 已提交
4584 4585 4586
 *	Initialize a new ata_port structure, and its associated
 *	scsi_host.
 *
L
Linus Torvalds 已提交
4587
 *	LOCKING:
J
Jeff Garzik 已提交
4588
 *	Inherited from caller.
L
Linus Torvalds 已提交
4589 4590 4591 4592
 */

static void ata_host_init(struct ata_port *ap, struct Scsi_Host *host,
			  struct ata_host_set *host_set,
J
Jeff Garzik 已提交
4593
			  const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
4594 4595 4596 4597 4598 4599 4600 4601
{
	unsigned int i;

	host->max_id = 16;
	host->max_lun = 1;
	host->max_channel = 1;
	host->unique_id = ata_unique_id++;
	host->max_cmd_len = 12;
4602

L
Linus Torvalds 已提交
4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621
	ap->flags = ATA_FLAG_PORT_DISABLED;
	ap->id = host->unique_id;
	ap->host = host;
	ap->ctl = ATA_DEVCTL_OBS;
	ap->host_set = host_set;
	ap->port_no = port_no;
	ap->hard_port_no =
		ent->legacy_mode ? ent->hard_port_no : port_no;
	ap->pio_mask = ent->pio_mask;
	ap->mwdma_mask = ent->mwdma_mask;
	ap->udma_mask = ent->udma_mask;
	ap->flags |= ent->host_flags;
	ap->ops = ent->port_ops;
	ap->cbl = ATA_CBL_NONE;
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;

	INIT_WORK(&ap->packet_task, atapi_packet_task, ap);
	INIT_WORK(&ap->pio_task, ata_pio_task, ap);
4622
	INIT_LIST_HEAD(&ap->eh_done_q);
L
Linus Torvalds 已提交
4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		ap->device[i].devno = i;

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

	memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
}

/**
 *	ata_host_add - Attach low-level ATA driver to system
 *	@ent: Information provided by low-level driver
 *	@host_set: Collections of ports to which we add
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
4641 4642
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
4643
 *	LOCKING:
J
Jeff Garzik 已提交
4644
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
4645 4646
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4647
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
4648 4649
 */

J
Jeff Garzik 已提交
4650
static struct ata_port * ata_host_add(const struct ata_probe_ent *ent,
L
Linus Torvalds 已提交
4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678
				      struct ata_host_set *host_set,
				      unsigned int port_no)
{
	struct Scsi_Host *host;
	struct ata_port *ap;
	int rc;

	DPRINTK("ENTER\n");
	host = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!host)
		return NULL;

	ap = (struct ata_port *) &host->hostdata[0];

	ata_host_init(ap, host, host_set, ent, port_no);

	rc = ap->ops->port_start(ap);
	if (rc)
		goto err_out;

	return ap;

err_out:
	scsi_host_put(host);
	return NULL;
}

/**
J
Jeff Garzik 已提交
4679 4680 4681 4682 4683 4684 4685 4686 4687 4688
 *	ata_device_add - Register hardware device with ATA and SCSI layers
 *	@ent: Probe information describing hardware device to be registered
 *
 *	This function processes the information provided in the probe
 *	information struct @ent, allocates the necessary ATA and SCSI
 *	host information structures, initializes them, and registers
 *	everything with requisite kernel subsystems.
 *
 *	This function requests irqs, probes the ATA bus, and probes
 *	the SCSI bus.
L
Linus Torvalds 已提交
4689 4690
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4691
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
4692 4693
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4694
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
4695 4696
 */

J
Jeff Garzik 已提交
4697
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
4698 4699 4700 4701 4702 4703 4704
{
	unsigned int count = 0, i;
	struct device *dev = ent->dev;
	struct ata_host_set *host_set;

	DPRINTK("ENTER\n");
	/* alloc a container for our list of ATA ports (buses) */
4705
	host_set = kzalloc(sizeof(struct ata_host_set) +
L
Linus Torvalds 已提交
4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747
			   (ent->n_ports * sizeof(void *)), GFP_KERNEL);
	if (!host_set)
		return 0;
	spin_lock_init(&host_set->lock);

	host_set->dev = dev;
	host_set->n_ports = ent->n_ports;
	host_set->irq = ent->irq;
	host_set->mmio_base = ent->mmio_base;
	host_set->private_data = ent->private_data;
	host_set->ops = ent->port_ops;

	/* register each port bound to this device */
	for (i = 0; i < ent->n_ports; i++) {
		struct ata_port *ap;
		unsigned long xfer_mode_mask;

		ap = ata_host_add(ent, host_set, i);
		if (!ap)
			goto err_out;

		host_set->ports[i] = ap;
		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
				(ap->pio_mask << ATA_SHIFT_PIO);

		/* print per-port info to dmesg */
		printk(KERN_INFO "ata%u: %cATA max %s cmd 0x%lX ctl 0x%lX "
				 "bmdma 0x%lX irq %lu\n",
			ap->id,
			ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
			ata_mode_string(xfer_mode_mask),
	       		ap->ioaddr.cmd_addr,
	       		ap->ioaddr.ctl_addr,
	       		ap->ioaddr.bmdma_addr,
	       		ent->irq);

		ata_chk_status(ap);
		host_set->ops->irq_clear(ap);
		count++;
	}

4748 4749
	if (!count)
		goto err_free_ret;
L
Linus Torvalds 已提交
4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763

	/* obtain irq, that is shared between channels */
	if (request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
			DRV_NAME, host_set))
		goto err_out;

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < count; i++) {
		struct ata_port *ap;
		int rc;

		ap = host_set->ports[i];

4764
		DPRINTK("ata%u: bus probe begin\n", ap->id);
L
Linus Torvalds 已提交
4765
		rc = ata_bus_probe(ap);
4766
		DPRINTK("ata%u: bus probe end\n", ap->id);
L
Linus Torvalds 已提交
4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789

		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.
			 */
		}

		rc = scsi_add_host(ap->host, dev);
		if (rc) {
			printk(KERN_ERR "ata%u: scsi_add_host failed\n",
			       ap->id);
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
	}

	/* probes are done, now scan each port's disk(s) */
4790
	DPRINTK("host probe begin\n");
L
Linus Torvalds 已提交
4791 4792 4793
	for (i = 0; i < count; i++) {
		struct ata_port *ap = host_set->ports[i];

J
Jeff Garzik 已提交
4794
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806
	}

	dev_set_drvdata(dev, host_set);

	VPRINTK("EXIT, returning %u\n", ent->n_ports);
	return ent->n_ports; /* success */

err_out:
	for (i = 0; i < count; i++) {
		ata_host_remove(host_set->ports[i], 1);
		scsi_host_put(host_set->ports[i]->host);
	}
4807
err_free_ret:
L
Linus Torvalds 已提交
4808 4809 4810 4811 4812
	kfree(host_set);
	VPRINTK("EXIT, returning 0\n");
	return 0;
}

4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858
/**
 *	ata_host_set_remove - PCI layer callback for device removal
 *	@host_set: ATA host set that was removed
 *
 *	Unregister all objects associated with this host set. Free those 
 *	objects.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */

void ata_host_set_remove(struct ata_host_set *host_set)
{
	struct ata_port *ap;
	unsigned int i;

	for (i = 0; i < host_set->n_ports; i++) {
		ap = host_set->ports[i];
		scsi_remove_host(ap->host);
	}

	free_irq(host_set->irq, host_set);

	for (i = 0; i < host_set->n_ports; i++) {
		ap = host_set->ports[i];

		ata_scsi_release(ap->host);

		if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
			struct ata_ioports *ioaddr = &ap->ioaddr;

			if (ioaddr->cmd_addr == 0x1f0)
				release_region(0x1f0, 8);
			else if (ioaddr->cmd_addr == 0x170)
				release_region(0x170, 8);
		}

		scsi_host_put(ap->host);
	}

	if (host_set->ops->host_stop)
		host_set->ops->host_stop(host_set);

	kfree(host_set);
}

L
Linus Torvalds 已提交
4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875
/**
 *	ata_scsi_release - SCSI layer callback hook for host unload
 *	@host: libata host to be unloaded
 *
 *	Performs all duties necessary to shut down a libata port...
 *	Kill port kthread, disable port, and release resources.
 *
 *	LOCKING:
 *	Inherited from SCSI layer.
 *
 *	RETURNS:
 *	One.
 */

int ata_scsi_release(struct Scsi_Host *host)
{
	struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
4876
	int i;
L
Linus Torvalds 已提交
4877 4878 4879 4880 4881

	DPRINTK("ENTER\n");

	ap->ops->port_disable(ap);
	ata_host_remove(ap, 0);
4882 4883
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		kfree(ap->device[i].id);
L
Linus Torvalds 已提交
4884 4885 4886 4887 4888 4889 4890 4891

	DPRINTK("EXIT\n");
	return 1;
}

/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
4892 4893 4894 4895 4896 4897 4898
 *
 *	Utility function which initializes data_addr, error_addr,
 *	feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
 *	device_addr, status_addr, and command_addr to standard offsets
 *	relative to cmd_addr.
 *
 *	Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
L
Linus Torvalds 已提交
4899
 */
E
Edward Falk 已提交
4900

L
Linus Torvalds 已提交
4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914
void ata_std_ports(struct ata_ioports *ioaddr)
{
	ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
	ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
	ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
	ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
	ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
	ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
	ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
	ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
	ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
	ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
}

E
Edward Falk 已提交
4915

4916 4917 4918 4919 4920 4921 4922 4923 4924
#ifdef CONFIG_PCI

void ata_pci_host_stop (struct ata_host_set *host_set)
{
	struct pci_dev *pdev = to_pci_dev(host_set->dev);

	pci_iounmap(pdev, host_set->mmio_base);
}

L
Linus Torvalds 已提交
4925 4926 4927 4928 4929
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
 *	PCI layer indicates to libata via this hook that
R
Randy Dunlap 已提交
4930
 *	hot-unplug or module unload event has occurred.
L
Linus Torvalds 已提交
4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943
 *	Handle this by unregistering all objects associated
 *	with this PCI device.  Free those objects.  Then finally
 *	release PCI resources and disable device.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */

void ata_pci_remove_one (struct pci_dev *pdev)
{
	struct device *dev = pci_dev_to_dev(pdev);
	struct ata_host_set *host_set = dev_get_drvdata(dev);

4944
	ata_host_set_remove(host_set);
L
Linus Torvalds 已提交
4945 4946 4947 4948 4949 4950
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	dev_set_drvdata(dev, NULL);
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
4951
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982
{
	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
4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999

int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
{
	pci_save_state(pdev);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, PCI_D3hot);
	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	pci_enable_device(pdev);
	pci_set_master(pdev);
	return 0;
}
L
Linus Torvalds 已提交
5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
}

module_init(ata_init);
module_exit(ata_exit);

5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041
static unsigned long ratelimit_time;
static spinlock_t ata_ratelimit_lock = SPIN_LOCK_UNLOCKED;

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;
}

L
Linus Torvalds 已提交
5042 5043 5044 5045 5046 5047 5048 5049 5050 5051
/*
 * 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.
 */

EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
EXPORT_SYMBOL_GPL(ata_device_add);
5052
EXPORT_SYMBOL_GPL(ata_host_set_remove);
L
Linus Torvalds 已提交
5053 5054
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
5055
EXPORT_SYMBOL_GPL(__ata_qc_complete);
L
Linus Torvalds 已提交
5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068
EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_eng_timeout);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
EXPORT_SYMBOL_GPL(ata_port_stop);
J
Jeff Garzik 已提交
5069
EXPORT_SYMBOL_GPL(ata_host_stop);
L
Linus Torvalds 已提交
5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080
EXPORT_SYMBOL_GPL(ata_interrupt);
EXPORT_SYMBOL_GPL(ata_qc_prep);
EXPORT_SYMBOL_GPL(ata_bmdma_setup);
EXPORT_SYMBOL_GPL(ata_bmdma_start);
EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
EXPORT_SYMBOL_GPL(ata_bmdma_status);
EXPORT_SYMBOL_GPL(ata_bmdma_stop);
EXPORT_SYMBOL_GPL(ata_port_probe);
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
5081
EXPORT_SYMBOL_GPL(ata_std_probeinit);
5082 5083 5084 5085
EXPORT_SYMBOL_GPL(ata_std_softreset);
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
EXPORT_SYMBOL_GPL(ata_std_probe_reset);
5086
EXPORT_SYMBOL_GPL(ata_drive_probe_reset);
5087
EXPORT_SYMBOL_GPL(ata_dev_revalidate);
L
Linus Torvalds 已提交
5088
EXPORT_SYMBOL_GPL(ata_port_disable);
5089
EXPORT_SYMBOL_GPL(ata_ratelimit);
5090
EXPORT_SYMBOL_GPL(ata_busy_sleep);
L
Linus Torvalds 已提交
5091 5092
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
5093
EXPORT_SYMBOL_GPL(ata_scsi_timed_out);
L
Linus Torvalds 已提交
5094 5095 5096 5097 5098
EXPORT_SYMBOL_GPL(ata_scsi_error);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
EXPORT_SYMBOL_GPL(ata_scsi_release);
EXPORT_SYMBOL_GPL(ata_host_intr);
EXPORT_SYMBOL_GPL(ata_dev_classify);
5099 5100
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
L
Linus Torvalds 已提交
5101
EXPORT_SYMBOL_GPL(ata_scsi_simulate);
5102 5103
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
L
Linus Torvalds 已提交
5104

5105
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
5106 5107 5108
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
5109 5110
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
5111
EXPORT_SYMBOL_GPL(ata_pci_host_stop);
L
Linus Torvalds 已提交
5112 5113 5114
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
J
Jens Axboe 已提交
5115 5116
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
L
Linus Torvalds 已提交
5117
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
5118 5119 5120 5121 5122

EXPORT_SYMBOL_GPL(ata_device_suspend);
EXPORT_SYMBOL_GPL(ata_device_resume);
EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);