libata-core.c 164.7 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/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>
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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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#define DRV_VERSION	"2.20"	/* must be exactly four chars */
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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
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unsigned int ata_print_id = 1;
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static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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int atapi_enabled = 1;
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module_param(atapi_enabled, int, 0444);
MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");

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

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int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");

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

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int libata_noacpi = 1;
module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in suspend/resume when set");

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
static unsigned int ata_pack_xfermask(unsigned int pio_mask,
				      unsigned int mwdma_mask,
				      unsigned int udma_mask)
{
	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}

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/**
 *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 *	@xfer_mask: xfer_mask to unpack
 *	@pio_mask: resulting pio_mask
 *	@mwdma_mask: resulting mwdma_mask
 *	@udma_mask: resulting udma_mask
 *
 *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 *	Any NULL distination masks will be ignored.
 */
static void ata_unpack_xfermask(unsigned int xfer_mask,
				unsigned int *pio_mask,
				unsigned int *mwdma_mask,
				unsigned int *udma_mask)
{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

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static const struct ata_xfer_ent {
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	int shift, bits;
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	u8 base;
} ata_xfer_tbl[] = {
	{ ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching XFER_* value, 0 if no match found.
 */
static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
{
	int highbit = fls(xfer_mask) - 1;
	const struct ata_xfer_ent *ent;

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

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

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

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
static int ata_xfer_mode2shift(unsigned int xfer_mode)
{
	const struct ata_xfer_ent *ent;

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

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/**
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 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
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 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
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 *	@mode_mask, or the constant C string "<n/a>".
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 */
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static const char *ata_mode_string(unsigned int xfer_mask)
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{
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	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
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		"PIO5",
		"PIO6",
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		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
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		"MWDMA3",
		"MWDMA4",
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		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
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	int highbit;
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	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
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	return "<n/a>";
}

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static const char *sata_spd_string(unsigned int spd)
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
	};

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

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void ata_dev_disable(struct ata_device *dev)
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{
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	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
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		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
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		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
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		dev->class++;
	}
}

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/**
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 *	ata_devchk - PATA device presence detection
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 *	@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.
 */

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

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

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	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
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	iowrite8(0xaa, ioaddr->nsect_addr);
	iowrite8(0x55, ioaddr->lbal_addr);
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	iowrite8(0x55, ioaddr->nsect_addr);
	iowrite8(0xaa, ioaddr->lbal_addr);
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	nsect = ioread8(ioaddr->nsect_addr);
	lbal = ioread8(ioaddr->lbal_addr);
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	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	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)
693
 *	@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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unsigned int
712
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);
723
	err = tf.feature;
724 725
	if (r_err)
		*r_err = err;
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727 728 729 730 731
	/* see if device passed diags: if master then continue and warn later */
	if (err == 0 && device == 0)
		/* diagnostic fail : do nothing _YET_ */
		ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
	else if (err == 1)
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		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
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		return ATA_DEV_NONE;
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738
	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
740

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	if (class == ATA_DEV_UNKNOWN)
742
		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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}

/**
749
 *	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;
	}
}

782
/**
783
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
784 785 786 787 788
 *	@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.
 *
789
 *	This function is identical to ata_id_string except that it
790 791 792 793 794 795
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
796 797
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
798 799 800 801 802
{
	unsigned char *p;

	WARN_ON(!(len & 1));

803
	ata_id_string(id, s, ofs, len - 1);
804 805 806 807 808 809

	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];
	}
}

826 827 828
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
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 *	@unknown: mode to assume if we cannot tell
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 *
 *	Set up the timing values for the device based upon the identify
 *	reported values for the DMA mode. This function is used by drivers
 *	which rely upon firmware configured modes, but wish to report the
 *	mode correctly when possible.
 *
 *	In addition we emit similarly formatted messages to the default
 *	ata_dev_set_mode handler, in order to provide consistency of
 *	presentation.
 */

void ata_id_to_dma_mode(struct ata_device *dev, u8 unknown)
{
	unsigned int mask;
	u8 mode;

	/* Pack the DMA modes */
	mask = ((dev->id[63] >> 8) << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA;
	if (dev->id[53] & 0x04)
		mask |= ((dev->id[88] >> 8) << ATA_SHIFT_UDMA) & ATA_MASK_UDMA;

	/* Select the mode in use */
	mode = ata_xfer_mask2mode(mask);

	if (mode != 0) {
		ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(mask));
	} else {
		/* SWDMA perhaps ? */
		mode = unknown;
		ata_dev_printk(dev, KERN_INFO, "configured for DMA\n");
	}

	/* Configure the device reporting */
	dev->xfer_mode = mode;
	dev->xfer_shift = ata_xfer_mode2shift(mode);
}

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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;

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	iowrite8(tmp, ap->ioaddr.device_addr);
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	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)
{
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	if (ata_msg_probe(ap))
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		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
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	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
953
 *	@id: IDENTIFY DEVICE page to dump
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 *
955 956
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

962
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",
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		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",
979 980 981 982 983
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
986 987
		id[88],
		id[93]);
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}

990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
static unsigned int ata_id_xfermask(const u16 *id)
{
	unsigned int pio_mask, mwdma_mask, udma_mask;

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1019
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1020 1021 1022 1023
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033

		/* But wait.. there's more. Design your standards by
		 * committee and you too can get a free iordy field to
		 * process. However its the speeds not the modes that
		 * are supported... Note drivers using the timing API
		 * will get this right anyway
		 */
	}

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1034

1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
		int pio = id[163] & 0x7;
		int dma = (id[163] >> 3) & 7;

		if (pio)
			pio_mask |= (1 << 5);
		if (pio > 1)
			pio_mask |= (1 << 6);
		if (dma)
			mwdma_mask |= (1 << 3);
		if (dma > 1)
			mwdma_mask |= (1 << 4);
	}

1052 1053 1054
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1055 1056 1057 1058

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1062
 *	@fn: workqueue function to be scheduled
1063
 *	@data: data for @fn to use
1064
 *	@delay: delay time for workqueue function
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 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
 *	port_task and EH.  ata_port_queue_task() may be ignored for EH
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
1078
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
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			 unsigned long delay)
{
	int rc;

1083
	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
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		return;

1086 1087
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
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1089
	rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
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	/* rc == 0 means that another user is using port task */
	WARN_ON(rc == 0);
}

/**
 *	ata_port_flush_task - Flush port_task
 *	@ap: The ata_port to flush port_task for
 *
 *	After this function completes, port_task is guranteed not to
 *	be running or scheduled.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
void ata_port_flush_task(struct ata_port *ap)
{
	unsigned long flags;

	DPRINTK("ENTER\n");

1111
	spin_lock_irqsave(ap->lock, flags);
1112
	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
1113
	spin_unlock_irqrestore(ap->lock, flags);
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	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.
	 */
	if (!cancel_delayed_work(&ap->port_task)) {
1124
		if (ata_msg_ctl(ap))
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			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
					__FUNCTION__);
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		flush_workqueue(ata_wq);
	}

1130
	spin_lock_irqsave(ap->lock, flags);
1131
	ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
1132
	spin_unlock_irqrestore(ap->lock, flags);
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1134 1135
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
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}

1138
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1139
{
1140
	struct completion *waiting = qc->private_data;
1141 1142 1143 1144 1145

	complete(waiting);
}

/**
1146
 *	ata_exec_internal_sg - execute libata internal command
1147 1148
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1149
 *	@cdb: CDB for packet command
1150
 *	@dma_dir: Data tranfer direction of the command
1151 1152
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1153 1154 1155 1156 1157 1158 1159 1160 1161
 *
 *	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.
1162 1163 1164
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1165
 */
1166 1167 1168 1169
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
			      int dma_dir, struct scatterlist *sg,
			      unsigned int n_elem)
1170
{
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	struct ata_port *ap = dev->ap;
1172 1173
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1174
	unsigned int tag, preempted_tag;
1175
	u32 preempted_sactive, preempted_qc_active;
1176
	DECLARE_COMPLETION_ONSTACK(wait);
1177
	unsigned long flags;
1178
	unsigned int err_mask;
1179
	int rc;
1180

1181
	spin_lock_irqsave(ap->lock, flags);
1182

1183
	/* no internal command while frozen */
1184
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1185
		spin_unlock_irqrestore(ap->lock, flags);
1186 1187 1188
		return AC_ERR_SYSTEM;
	}

1189
	/* initialize internal qc */
1190

1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

1201
	if (test_and_set_bit(tag, &ap->qc_allocated))
1202
		BUG();
1203
	qc = __ata_qc_from_tag(ap, tag);
1204 1205 1206 1207 1208 1209 1210 1211

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

	preempted_tag = ap->active_tag;
1212 1213
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1214
	ap->active_tag = ATA_TAG_POISON;
1215 1216
	ap->sactive = 0;
	ap->qc_active = 0;
1217 1218

	/* prepare & issue qc */
1219
	qc->tf = *tf;
1220 1221
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1222
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1223 1224
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1225 1226 1227 1228 1229 1230
		unsigned int i, buflen = 0;

		for (i = 0; i < n_elem; i++)
			buflen += sg[i].length;

		ata_sg_init(qc, sg, n_elem);
1231
		qc->nbytes = buflen;
1232 1233
	}

1234
	qc->private_data = &wait;
1235 1236
	qc->complete_fn = ata_qc_complete_internal;

1237
	ata_qc_issue(qc);
1238

1239
	spin_unlock_irqrestore(ap->lock, flags);
1240

A
Andrew Morton 已提交
1241
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1242 1243

	ata_port_flush_task(ap);
1244

1245
	if (!rc) {
1246
		spin_lock_irqsave(ap->lock, flags);
1247 1248 1249

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1250 1251
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1252
		 */
1253
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1254 1255 1256 1257 1258 1259
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1260

1261 1262
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1263
					"qc timeout (cmd 0x%x)\n", command);
1264 1265
		}

1266
		spin_unlock_irqrestore(ap->lock, flags);
1267 1268
	}

1269 1270 1271 1272
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

		if (!qc->err_mask)
			qc->err_mask |= AC_ERR_OTHER;

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1283 1284
	}

1285
	/* finish up */
1286
	spin_lock_irqsave(ap->lock, flags);
1287

1288
	*tf = qc->result_tf;
1289 1290 1291
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1292
	ap->active_tag = preempted_tag;
1293 1294
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1295

1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1307
	if (ap->flags & ATA_FLAG_DISABLED) {
1308 1309 1310 1311
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1312
	spin_unlock_irqrestore(ap->lock, flags);
1313

1314
	return err_mask;
1315 1316
}

1317
/**
1318
 *	ata_exec_internal - execute libata internal command
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
			   int dma_dir, void *buf, unsigned int buflen)
{
1339 1340
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1341

1342 1343 1344 1345 1346 1347
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1348

1349
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1350 1351
}

1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1365
 */
1366
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1367 1368 1369 1370 1371 1372 1373 1374 1375
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1376
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1377 1378
}

1379 1380 1381 1382 1383 1384 1385
/**
 *	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.
 */
A
Alan Cox 已提交
1386
 
1387 1388
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1389 1390 1391
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
	if (adev->ap->flags & ATA_FLAG_NO_IORDY)
1392
		return 0;
A
Alan Cox 已提交
1393 1394 1395 1396 1397
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1398
		return 1;
A
Alan Cox 已提交
1399 1400
	return 0;
}
1401

A
Alan Cox 已提交
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
 
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1412 1413
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1414
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1415 1416 1417 1418
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1419 1420
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1421 1422
		}
	}
A
Alan Cox 已提交
1423
	return 3 << ATA_SHIFT_PIO;
1424 1425
}

L
Linus Torvalds 已提交
1426
/**
1427 1428 1429
 *	ata_dev_read_id - Read ID data from the specified device
 *	@dev: target device
 *	@p_class: pointer to class of the target device (may be changed)
1430
 *	@flags: ATA_READID_* flags
1431
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1432
 *
1433 1434
 *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
 *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
T
Tejun Heo 已提交
1435 1436
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1437 1438
 *
 *	LOCKING:
1439 1440 1441 1442
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1443
 */
1444
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1445
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1446
{
T
Tejun Heo 已提交
1447
	struct ata_port *ap = dev->ap;
1448
	unsigned int class = *p_class;
1449
	struct ata_taskfile tf;
1450 1451 1452
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1453

1454
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1455
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1456

1457
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1458

1459
 retry:
T
Tejun Heo 已提交
1460
	ata_tf_init(dev, &tf);
1461

1462 1463
	switch (class) {
	case ATA_DEV_ATA:
1464
		tf.command = ATA_CMD_ID_ATA;
1465 1466
		break;
	case ATA_DEV_ATAPI:
1467
		tf.command = ATA_CMD_ID_ATAPI;
1468 1469 1470 1471 1472
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1473 1474
	}

1475
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1476 1477 1478 1479 1480 1481 1482 1483 1484 1485

	/* Some devices choke if TF registers contain garbage.  Make
	 * sure those are properly initialized.
	 */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1486

T
Tejun Heo 已提交
1487
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1488
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1489
	if (err_mask) {
1490
		if (err_mask & AC_ERR_NODEV_HINT) {
1491
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1492
				ap->print_id, dev->devno);
1493 1494 1495
			return -ENOENT;
		}

1496 1497
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1498 1499 1500
		goto err_out;
	}

1501
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1502

1503
	/* sanity check */
1504 1505 1506 1507 1508 1509 1510 1511 1512
	rc = -EINVAL;
	reason = "device reports illegal type";

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1513 1514
	}

1515
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1516 1517 1518 1519 1520 1521 1522 1523 1524
		/*
		 * 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)) {
T
Tejun Heo 已提交
1525
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1526 1527 1528 1529 1530 1531 1532 1533 1534
			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.
			 */
1535
			flags &= ~ATA_READID_POSTRESET;
1536 1537 1538 1539 1540
			goto retry;
		}
	}

	*p_class = class;
1541

1542 1543 1544
	return 0;

 err_out:
T
Tejun Heo 已提交
1545
	if (ata_msg_warn(ap))
1546
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1547
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1548 1549 1550
	return rc;
}

T
Tejun Heo 已提交
1551
static inline u8 ata_dev_knobble(struct ata_device *dev)
1552
{
T
Tejun Heo 已提交
1553
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1554 1555
}

1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
	struct ata_port *ap = dev->ap;
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
1566 1567 1568 1569
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1570
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1571
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1572 1573 1574 1575 1576 1577 1578 1579 1580
		dev->flags |= ATA_DFLAG_NCQ;
	}

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

1581
/**
1582 1583 1584 1585 1586
 *	ata_dev_configure - Configure the specified ATA/ATAPI device
 *	@dev: Target device to configure
 *
 *	Configure @dev according to @dev->id.  Generic and low-level
 *	driver specific fixups are also applied.
1587 1588
 *
 *	LOCKING:
1589 1590 1591 1592
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1593
 */
1594
int ata_dev_configure(struct ata_device *dev)
1595
{
T
Tejun Heo 已提交
1596
	struct ata_port *ap = dev->ap;
1597
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1598
	const u16 *id = dev->id;
1599
	unsigned int xfer_mask;
1600
	char revbuf[7];		/* XYZ-99\0 */
1601 1602
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1603
	int rc;
1604

1605
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1606 1607
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1608
		return 0;
1609 1610
	}

1611
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1612
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1613

1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
	/* set _SDD */
	rc = ata_acpi_push_id(ap, dev->devno);
	if (rc) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set _SDD(%d)\n",
			rc);
	}

	/* retrieve and execute the ATA task file of _GTF */
	ata_acpi_exec_tfs(ap);

1624
	/* print device capabilities */
1625
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1626 1627 1628
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
1629
			       __FUNCTION__,
1630 1631
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1632

1633
	/* initialize to-be-configured parameters */
1634
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1635 1636 1637 1638 1639 1640 1641
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
1642 1643 1644 1645
	/*
	 * common ATA, ATAPI feature tests
	 */

1646
	/* find max transfer mode; for printk only */
1647
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1648

1649 1650
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1651 1652 1653

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1654 1655
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1656 1657 1658
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1659 1660 1661 1662 1663
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1664
		dev->n_sectors = ata_id_n_sectors(id);
1665

1666
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1667
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1668 1669
				sizeof(fwrevbuf));

1670
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1671 1672 1673 1674 1675
				sizeof(modelbuf));

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

1676
		if (ata_id_has_lba(id)) {
1677
			const char *lba_desc;
1678
			char ncq_desc[20];
1679

1680 1681
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1682
			if (ata_id_has_lba48(id)) {
1683
				dev->flags |= ATA_DFLAG_LBA48;
1684
				lba_desc = "LBA48";
1685 1686 1687 1688

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1689
			}
1690

1691 1692 1693
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1694
			/* print device info to dmesg */
1695 1696 1697 1698 1699 1700 1701
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
1702
					(unsigned long long)dev->n_sectors,
1703 1704
					dev->multi_count, lba_desc, ncq_desc);
			}
1705
		} else {
1706 1707 1708
			/* CHS */

			/* Default translation */
1709 1710 1711
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1712

1713
			if (ata_id_current_chs_valid(id)) {
1714
				/* Current CHS translation is valid. */
1715 1716 1717
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1718 1719 1720
			}

			/* print device info to dmesg */
1721
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1722
				ata_dev_printk(dev, KERN_INFO,
1723 1724 1725
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1726
				ata_dev_printk(dev, KERN_INFO,
1727 1728 1729 1730 1731
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1732 1733
		}

1734
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1735 1736 1737
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1738
	else if (dev->class == ATA_DEV_ATAPI) {
1739 1740
		char *cdb_intr_string = "";

1741
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1742
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1743
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1744 1745
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1746
			rc = -EINVAL;
L
Linus Torvalds 已提交
1747 1748
			goto err_out_nosup;
		}
1749
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1750

1751
		if (ata_id_cdb_intr(dev->id)) {
1752
			dev->flags |= ATA_DFLAG_CDB_INTR;
1753 1754
			cdb_intr_string = ", CDB intr";
		}
1755

L
Linus Torvalds 已提交
1756
		/* print device info to dmesg */
1757
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1758 1759 1760
			ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1761 1762
	}

1763 1764 1765 1766 1767
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
		/* Let the user know. We don't want to disallow opens for
		   rescue purposes, or in case the vendor is just a blithering
		   idiot */
                if (print_info) {
			ata_dev_printk(dev, KERN_WARNING,
"Drive reports diagnostics failure. This may indicate a drive\n");
			ata_dev_printk(dev, KERN_WARNING,
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

1780
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1781
	if (ata_dev_knobble(dev)) {
1782
		if (ata_msg_drv(ap) && print_info)
1783 1784
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1785
		dev->udma_mask &= ATA_UDMA5;
1786 1787 1788
		dev->max_sectors = ATA_MAX_SECTORS;
	}

1789
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
1790 1791
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
1792

1793 1794 1795 1796
	/* limit ATAPI DMA to R/W commands only */
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
		dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;

1797
	if (ap->ops->dev_config)
1798
		ap->ops->dev_config(dev);
1799

1800 1801 1802
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1803
	return 0;
L
Linus Torvalds 已提交
1804 1805

err_out_nosup:
1806
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1807 1808
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1809
	return rc;
L
Linus Torvalds 已提交
1810 1811
}

A
Alan Cox 已提交
1812
/**
1813
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
1814 1815
 *	@ap: port
 *
1816
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
1817 1818 1819 1820 1821 1822 1823 1824 1825
 *	detection.
 */

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

/**
1826
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
1827 1828
 *	@ap: port
 *
1829
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861
 *	detection.
 */

int ata_cable_80wire(struct ata_port *ap)
{
	return ATA_CBL_PATA80;
}

/**
 *	ata_cable_unknown	-	return unknown PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which have no PATA cable detection.
 */

int ata_cable_unknown(struct ata_port *ap)
{
	return ATA_CBL_PATA_UNK;
}

/**
 *	ata_cable_sata	-	return SATA cable type
 *	@ap: port
 *
 *	Helper method for drivers which have SATA cables
 */

int ata_cable_sata(struct ata_port *ap)
{
	return ATA_CBL_SATA;
}

L
Linus Torvalds 已提交
1862 1863 1864 1865
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1866 1867 1868 1869
 *	Master ATA bus probing function.  Initiates a hardware-dependent
 *	bus reset, then attempts to identify any devices found on
 *	the bus.
 *
L
Linus Torvalds 已提交
1870
 *	LOCKING:
J
Jeff Garzik 已提交
1871
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1872 1873
 *
 *	RETURNS:
1874
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1875 1876
 */

1877
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1878
{
1879
	unsigned int classes[ATA_MAX_DEVICES];
1880
	int tries[ATA_MAX_DEVICES];
1881
	int i, rc;
1882
	struct ata_device *dev;
L
Linus Torvalds 已提交
1883

1884
	ata_port_probe(ap);
1885

1886 1887 1888 1889
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
1890
	/* reset and determine device classes */
1891
	ap->ops->phy_reset(ap);
1892

1893 1894
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1895

1896 1897 1898 1899 1900
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1901

1902
		dev->class = ATA_DEV_UNKNOWN;
1903
	}
L
Linus Torvalds 已提交
1904

1905
	ata_port_probe(ap);
1906

A
Alan Cox 已提交
1907 1908 1909 1910 1911 1912
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

	for (i = 0; i < ATA_MAX_DEVICES; i++)
		ap->device[i].pio_mode = XFER_PIO_0;

1913 1914 1915 1916 1917
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

	for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
1918
		dev = &ap->device[i];
1919

1920 1921
		if (tries[i])
			dev->class = classes[i];
1922

1923
		if (!ata_dev_enabled(dev))
1924 1925
			continue;

1926 1927
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1928 1929
		if (rc)
			goto fail;
1930 1931
	}

A
Alan Cox 已提交
1932 1933 1934 1935
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

1936 1937 1938 1939 1940 1941 1942
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

	for(i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;
1943

1944 1945 1946
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1947 1948
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1949 1950
	}

1951
	/* configure transfer mode */
1952
	rc = ata_set_mode(ap, &dev);
1953
	if (rc)
1954
		goto fail;
L
Linus Torvalds 已提交
1955

1956 1957 1958
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1959

1960 1961
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1962
	ap->ops->port_disable(ap);
1963
	return -ENODEV;
1964 1965

 fail:
1966 1967
	tries[dev->devno]--;

1968 1969
	switch (rc) {
	case -EINVAL:
1970
		/* eeek, something went very wrong, give up */
1971 1972
		tries[dev->devno] = 0;
		break;
1973 1974 1975 1976

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
1977
	case -EIO:
1978 1979 1980 1981 1982 1983 1984
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
			sata_down_spd_limit(ap);
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
1985 1986
	}

1987
	if (!tries[dev->devno])
T
Tejun Heo 已提交
1988
		ata_dev_disable(dev);
1989

1990
	goto retry;
L
Linus Torvalds 已提交
1991 1992 1993
}

/**
J
Jeff Garzik 已提交
1994 1995
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1996
 *
J
Jeff Garzik 已提交
1997 1998 1999
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2000
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2001
 *	serialization.
L
Linus Torvalds 已提交
2002 2003 2004 2005
 */

void ata_port_probe(struct ata_port *ap)
{
2006
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2007 2008
}

2009 2010 2011 2012 2013 2014 2015 2016 2017
/**
 *	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.
 */
2018
void sata_print_link_status(struct ata_port *ap)
2019
{
2020
	u32 sstatus, scontrol, tmp;
2021

2022
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2023
		return;
2024
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2025

2026
	if (ata_port_online(ap)) {
2027
		tmp = (sstatus >> 4) & 0xf;
2028 2029 2030
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2031
	} else {
2032 2033 2034
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2035 2036 2037
	}
}

L
Linus Torvalds 已提交
2038
/**
J
Jeff Garzik 已提交
2039 2040
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2041
 *
J
Jeff Garzik 已提交
2042 2043 2044
 *	This function issues commands to standard SATA Sxxx
 *	PHY registers, to wake up the phy (and device), and
 *	clear any reset condition.
L
Linus Torvalds 已提交
2045 2046
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2047
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2048 2049 2050 2051 2052 2053 2054 2055
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2056
		/* issue phy wake/reset */
2057
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2058 2059 2060
		/* Couldn't find anything in SATA I/II specs, but
		 * AHCI-1.1 10.4.2 says at least 1 ms. */
		mdelay(1);
L
Linus Torvalds 已提交
2061
	}
2062 2063
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2064 2065 2066 2067

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2068
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2069 2070 2071 2072
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2073 2074
	/* print link status */
	sata_print_link_status(ap);
2075

2076
	/* TODO: phy layer with polling, timeouts, etc. */
2077
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2078
		ata_port_probe(ap);
2079
	else
L
Linus Torvalds 已提交
2080 2081
		ata_port_disable(ap);

2082
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093
		return;

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

	ap->cbl = ATA_CBL_SATA;
}

/**
J
Jeff Garzik 已提交
2094 2095
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2096
 *
J
Jeff Garzik 已提交
2097 2098
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2099 2100
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2101
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2102 2103 2104 2105 2106
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2107
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2108 2109 2110 2111
		return;
	ata_bus_reset(ap);
}

2112 2113 2114 2115 2116 2117 2118
/**
 *	ata_dev_pair		-	return other device on cable
 *	@adev: device
 *
 *	Obtain the other device on the same cable, or if none is
 *	present NULL is returned
 */
2119

T
Tejun Heo 已提交
2120
struct ata_device *ata_dev_pair(struct ata_device *adev)
2121
{
T
Tejun Heo 已提交
2122
	struct ata_port *ap = adev->ap;
2123
	struct ata_device *pair = &ap->device[1 - adev->devno];
2124
	if (!ata_dev_enabled(pair))
2125 2126 2127 2128
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2129
/**
J
Jeff Garzik 已提交
2130 2131
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2132
 *
J
Jeff Garzik 已提交
2133 2134 2135 2136 2137
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is disabled, and should
 *	never attempt to probe or communicate with devices
 *	on this port.
 *
J
Jeff Garzik 已提交
2138
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2139
 *	serialization.
L
Linus Torvalds 已提交
2140 2141 2142 2143 2144 2145
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2146
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2147 2148
}

2149
/**
2150
 *	sata_down_spd_limit - adjust SATA spd limit downward
2151 2152 2153 2154
 *	@ap: Port to adjust SATA spd limit for
 *
 *	Adjust SATA spd limit of @ap downward.  Note that this
 *	function only adjusts the limit.  The change must be applied
2155
 *	using sata_set_spd().
2156 2157 2158 2159 2160 2161 2162
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2163
int sata_down_spd_limit(struct ata_port *ap)
2164
{
2165 2166
	u32 sstatus, spd, mask;
	int rc, highbit;
2167

2168 2169 2170
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2171 2172 2173 2174 2175 2176 2177

	mask = ap->sata_spd_limit;
	if (mask <= 1)
		return -EINVAL;
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2178
	spd = (sstatus >> 4) & 0xf;
2179 2180 2181 2182 2183 2184 2185 2186 2187
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2188 2189
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2190 2191 2192 2193

	return 0;
}

2194
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209
{
	u32 spd, limit;

	if (ap->sata_spd_limit == UINT_MAX)
		limit = 0;
	else
		limit = fls(ap->sata_spd_limit);

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

	return spd != limit;
}

/**
2210
 *	sata_set_spd_needed - is SATA spd configuration needed
2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223
 *	@ap: Port in question
 *
 *	Test whether the spd limit in SControl matches
 *	@ap->sata_spd_limit.  This function is used to determine
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2224
int sata_set_spd_needed(struct ata_port *ap)
2225 2226 2227
{
	u32 scontrol;

2228
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2229 2230
		return 0;

2231
	return __sata_set_spd_needed(ap, &scontrol);
2232 2233 2234
}

/**
2235
 *	sata_set_spd - set SATA spd according to spd limit
2236 2237 2238 2239 2240 2241 2242 2243 2244
 *	@ap: Port to set SATA spd for
 *
 *	Set SATA spd of @ap according to sata_spd_limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2245
 *	changed.  Negative errno if SCR registers are inaccessible.
2246
 */
2247
int sata_set_spd(struct ata_port *ap)
2248 2249
{
	u32 scontrol;
2250
	int rc;
2251

2252 2253
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2254

2255
	if (!__sata_set_spd_needed(ap, &scontrol))
2256 2257
		return 0;

2258 2259 2260
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2261 2262 2263
	return 1;
}

A
Alan Cox 已提交
2264 2265 2266 2267 2268
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2269
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2270
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2271 2272 2273
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
A
Alan Cox 已提交
2274 2275 2276 2277 2278 2279 2280 2281 2282
 */

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 },

2283 2284
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
A
Alan Cox 已提交
2285 2286 2287 2288 2289
	{ 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 }, */
2290

A
Alan Cox 已提交
2291 2292 2293
	{ 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 },
2294

A
Alan Cox 已提交
2295 2296 2297 2298
	{ 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 },

2299 2300
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
A
Alan Cox 已提交
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 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
	{ 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
2346
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2347
			return NULL;
2348
	return t;
A
Alan Cox 已提交
2349 2350 2351 2352 2353 2354 2355 2356 2357
}

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;

	/*
2358
	 * Find the mode.
2359
	 */
A
Alan Cox 已提交
2360 2361 2362 2363

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

2364 2365
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
	/*
	 * 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.
	 */

2386
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2387 2388

	/*
2389 2390 2391
	 * 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
2392 2393
	 */

2394
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2395 2396 2397 2398 2399
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2400
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
	 */

	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;
}

2416 2417 2418
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2419
 *	@sel: ATA_DNXFER_* selector
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2431
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2432
{
2433 2434 2435 2436
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2437

2438 2439
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2440

2441 2442 2443 2444
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2445

2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

	case ATA_DNXFER_DMA:
		if (udma_mask) {
			highbit = fls(udma_mask) - 1;
			udma_mask &= ~(1 << highbit);
			if (!udma_mask)
				return -ENOENT;
		} else if (mwdma_mask) {
			highbit = fls(mwdma_mask) - 1;
			mwdma_mask &= ~(1 << highbit);
			if (!mwdma_mask)
				return -ENOENT;
		}
		break;

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

	case ATA_DNXFER_FORCE_PIO0:
		pio_mask &= 1;
	case ATA_DNXFER_FORCE_PIO:
		mwdma_mask = 0;
		udma_mask = 0;
		break;

	default:
		BUG();
	}

	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);

	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
		return -ENOENT;

	if (!quiet) {
		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
			snprintf(buf, sizeof(buf), "%s:%s",
				 ata_mode_string(xfer_mask),
				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
		else
			snprintf(buf, sizeof(buf), "%s",
				 ata_mode_string(xfer_mask));

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
2498 2499 2500 2501 2502 2503 2504

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

	return 0;
}

T
Tejun Heo 已提交
2505
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2506
{
2507
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2508 2509
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2510

2511
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2512 2513 2514
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2515
	err_mask = ata_dev_set_xfermode(dev);
2516 2517 2518 2519
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
        	err_mask &= ~AC_ERR_DEV;

2520
	if (err_mask) {
2521 2522
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2523 2524
		return -EIO;
	}
L
Linus Torvalds 已提交
2525

2526
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2527
	rc = ata_dev_revalidate(dev, 0);
2528
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2529
	if (rc)
2530
		return rc;
2531

2532 2533
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2534

2535 2536
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2537
	return 0;
L
Linus Torvalds 已提交
2538 2539 2540
}

/**
2541
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
L
Linus Torvalds 已提交
2542
 *	@ap: port on which timings will be programmed
2543
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2544
 *
2545 2546 2547
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
2548
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2549
 *
L
Linus Torvalds 已提交
2550
 *	LOCKING:
J
Jeff Garzik 已提交
2551
 *	PCI/etc. bus probe sem.
2552 2553 2554
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2555
 */
2556 2557

int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2558
{
2559
	struct ata_device *dev;
2560
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2561

2562

2563 2564
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2565
		unsigned int pio_mask, dma_mask;
2566

2567 2568
		dev = &ap->device[i];

2569
		if (!ata_dev_enabled(dev))
2570 2571
			continue;

T
Tejun Heo 已提交
2572
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2573

2574 2575 2576 2577
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
2578

2579
		found = 1;
2580 2581
		if (dev->dma_mode)
			used_dma = 1;
2582
	}
2583
	if (!found)
2584
		goto out;
2585 2586

	/* step 2: always set host PIO timings */
2587 2588 2589 2590 2591 2592
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2593
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2594
			rc = -EINVAL;
2595
			goto out;
2596 2597 2598 2599 2600 2601 2602
		}

		dev->xfer_mode = dev->pio_mode;
		dev->xfer_shift = ATA_SHIFT_PIO;
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}
L
Linus Torvalds 已提交
2603

2604
	/* step 3: set host DMA timings */
2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];

		if (!ata_dev_enabled(dev) || !dev->dma_mode)
			continue;

		dev->xfer_mode = dev->dma_mode;
		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
		if (ap->ops->set_dmamode)
			ap->ops->set_dmamode(ap, dev);
	}
L
Linus Torvalds 已提交
2616 2617

	/* step 4: update devices' xfer mode */
2618
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2619
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2620

A
Alan 已提交
2621
		/* don't update suspended devices' xfer mode */
2622
		if (!ata_dev_ready(dev))
2623 2624
			continue;

T
Tejun Heo 已提交
2625
		rc = ata_dev_set_mode(dev);
2626
		if (rc)
2627
			goto out;
2628
	}
L
Linus Torvalds 已提交
2629

2630 2631
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2632
	 */
J
Jeff Garzik 已提交
2633
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2634
		ap->host->simplex_claimed = ap;
2635

2636
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2637 2638
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);
2639 2640 2641 2642
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2643 2644
}

2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
 *	@r_failed_dev: out paramter for failed device
 *
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
{
	/* has private set_mode? */
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
	return ata_do_set_mode(ap, r_failed_dev);
}

2668 2669 2670 2671 2672 2673 2674 2675 2676 2677
/**
 *	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:
J
Jeff Garzik 已提交
2678
 *	spin_lock_irqsave(host lock)
2679 2680 2681 2682 2683 2684 2685 2686 2687
 */

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
2688 2689 2690 2691 2692 2693
/**
 *	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
2694 2695 2696
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2697 2698 2699 2700 2701
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2702
 */
2703 2704
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2705 2706 2707 2708 2709 2710 2711
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2712 2713
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2714 2715 2716 2717
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2718
	if (status != 0xff && (status & ATA_BUSY))
2719
		ata_port_printk(ap, KERN_WARNING,
2720 2721
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2722 2723

	timeout = timer_start + tmout;
2724 2725
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2726 2727 2728 2729
		msleep(50);
		status = ata_chk_status(ap);
	}

2730 2731 2732
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2733
	if (status & ATA_BUSY) {
2734
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2735 2736
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2737
		return -EBUSY;
L
Linus Torvalds 已提交
2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763
	}

	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);
T
Tejun Heo 已提交
2764 2765
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789
		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);
}

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

T
Tejun Heo 已提交
2790
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
2791 2792

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2793 2794 2795 2796 2797
	iowrite8(ap->ctl, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2798 2799 2800 2801 2802 2803 2804 2805

	/* 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.
2806 2807
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2808 2809 2810
	 */
	msleep(150);

2811
	/* Before we perform post reset processing we want to see if
2812 2813 2814
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2815 2816
	if (ata_check_status(ap) == 0xFF)
		return 0;
2817

L
Linus Torvalds 已提交
2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835
	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
2836
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2837
 *	Obtains host lock.
L
Linus Torvalds 已提交
2838 2839
 *
 *	SIDE EFFECTS:
2840
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2841 2842 2843 2844 2845 2846 2847
 */

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;
T
Tejun Heo 已提交
2848
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2849

T
Tejun Heo 已提交
2850
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870

	/* 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)
T
Tejun Heo 已提交
2871 2872
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2873 2874 2875 2876

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2877
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2878
	if ((slave_possible) && (err != 0x81))
2879
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2880 2881

	/* re-enable interrupts */
2882
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896

	/* 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 */
T
Tejun Heo 已提交
2897
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2898 2899 2900 2901 2902 2903
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2904
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2905 2906 2907 2908 2909
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Make sure SStatus of @ap reaches stable state, determined by
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
 *	beginning of the stable state.  Because, after hot unplugging,
 *	DET gets stuck at 1 on some controllers, this functions waits
 *	until timeout then returns 0 if DET is stable at 1.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
2929
{
2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
	unsigned long interval_msec = params[0];
	unsigned long duration = params[1] * HZ / 1000;
	unsigned long timeout = jiffies + params[2] * HZ / 1000;
	unsigned long last_jiffies;
	u32 last, cur;
	int rc;

	if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
		if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
			if (cur == 1 && time_before(jiffies, timeout))
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

		/* check timeout */
		if (time_after(jiffies, timeout))
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
{
	u32 scontrol;
2985 2986 2987 2988
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2989

2990
	scontrol = (scontrol & 0x0f0) | 0x300;
2991 2992 2993

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2994

2995 2996 2997 2998
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2999

3000
	return sata_phy_debounce(ap, params);
3001 3002
}

3003 3004 3005 3006 3007 3008 3009 3010
static void ata_wait_spinup(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
	unsigned long end, secs;
	int rc;

	/* first, debounce phy if SATA */
	if (ap->cbl == ATA_CBL_SATA) {
3011
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046

		/* if debounced successfully and offline, no need to wait */
		if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
			return;
	}

	/* okay, let's give the drive time to spin up */
	end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
	secs = ((end - jiffies) + HZ - 1) / HZ;

	if (time_after(jiffies, end))
		return;

	if (secs > 5)
		ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
				"(%lu secs)\n", secs);

	schedule_timeout_uninterruptible(end - jiffies);
}

/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
 *
 *	@ap is about to be reset.  Initialize it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_std_prereset(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
3047
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3048 3049
	int rc;

3050 3051 3052 3053 3054 3055 3056 3057
	/* handle link resume & hotplug spinup */
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

	if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
	    (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
		ata_wait_spinup(ap);
3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082

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

	/* if SATA, resume phy */
	if (ap->cbl == ATA_CBL_SATA) {
		rc = sata_phy_resume(ap, timing);
		if (rc && rc != -EOPNOTSUPP) {
			/* phy resume failed */
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"link for reset (errno=%d)\n", rc);
			return rc;
		}
	}

	/* Wait for !BSY if the controller can wait for the first D2H
	 * Reg FIS and we don't know that no device is attached.
	 */
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	return 0;
}

3083 3084 3085 3086 3087
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
3088
 *	Reset host port using ATA SRST.
3089 3090 3091 3092 3093 3094 3095
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3096
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
3097 3098 3099 3100 3101 3102 3103
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

3104
	if (ata_port_offline(ap)) {
3105 3106 3107 3108
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121
	/* 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) {
3122 3123
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
3124 3125 3126 3127 3128 3129 3130 3131
		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);

3132
 out:
3133 3134 3135 3136 3137
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3138
 *	sata_port_hardreset - reset port via SATA phy reset
3139
 *	@ap: port to reset
3140
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3141 3142 3143 3144 3145 3146 3147 3148 3149
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3150
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3151
{
3152
	u32 scontrol;
3153
	int rc;
3154

3155 3156
	DPRINTK("ENTER\n");

3157
	if (sata_set_spd_needed(ap)) {
3158 3159 3160 3161 3162
		/* SATA spec says nothing about how to reconfigure
		 * spd.  To be on the safe side, turn off phy during
		 * reconfiguration.  This works for at least ICH7 AHCI
		 * and Sil3124.
		 */
3163
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3164
			goto out;
3165

3166
		scontrol = (scontrol & 0x0f0) | 0x304;
3167 3168

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3169
			goto out;
3170

3171
		sata_set_spd(ap);
3172 3173 3174
	}

	/* issue phy wake/reset */
3175
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3176
		goto out;
3177

3178
	scontrol = (scontrol & 0x0f0) | 0x301;
3179 3180

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3181
		goto out;
3182

3183
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3184 3185 3186 3187
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3188
	/* bring phy back */
3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222
	rc = sata_phy_resume(ap, timing);
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
 *	@ap: port to reset
 *	@class: resulting class of attached device
 *
 *	SATA phy-reset host port using DET bits of SControl register,
 *	wait for !BSY and classify the attached device.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
	rc = sata_port_hardreset(ap, timing);
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3223 3224

	/* TODO: phy layer with polling, timeouts, etc. */
3225
	if (ata_port_offline(ap)) {
3226 3227 3228 3229 3230
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3231 3232 3233
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3234
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3235 3236
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3237 3238 3239
		return -EIO;
	}

3240 3241
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261
	*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.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
{
3262 3263
	u32 serror;

3264 3265 3266
	DPRINTK("ENTER\n");

	/* print link status */
3267
	sata_print_link_status(ap);
3268

3269 3270 3271 3272
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3273
	/* re-enable interrupts */
3274 3275
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3276 3277 3278 3279 3280 3281 3282

	/* 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);

3283 3284 3285 3286 3287 3288 3289
	/* 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 */
T
Tejun Heo 已提交
3290 3291
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3292 3293 3294 3295

	DPRINTK("EXIT\n");
}

3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
/**
 *	ata_dev_same_device - Determine whether new ID matches configured device
 *	@dev: device to compare against
 *	@new_class: class of the new device
 *	@new_id: IDENTIFY page of the new device
 *
 *	Compare @new_class and @new_id against @dev and determine
 *	whether @dev is the device indicated by @new_class and
 *	@new_id.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if @dev matches @new_class and @new_id, 0 otherwise.
 */
T
Tejun Heo 已提交
3312 3313
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3314 3315
{
	const u16 *old_id = dev->id;
3316 3317
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3318 3319 3320
	u64 new_n_sectors;

	if (dev->class != new_class) {
3321 3322
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3323 3324 3325
		return 0;
	}

3326 3327 3328 3329
	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3330 3331 3332
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3333 3334
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3335 3336 3337 3338
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3339 3340
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3341 3342 3343 3344
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3345 3346 3347 3348
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3349 3350 3351 3352 3353 3354 3355 3356 3357
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3358
 *	@readid_flags: read ID flags
3359 3360 3361 3362 3363 3364 3365 3366 3367 3368
 *
 *	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
 */
3369
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3370
{
3371
	unsigned int class = dev->class;
3372
	u16 *id = (void *)dev->ap->sector_buf;
3373 3374
	int rc;

3375 3376 3377 3378
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3379

3380
	/* read ID data */
3381
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3382 3383 3384 3385
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3386
	if (!ata_dev_same_device(dev, class, id)) {
3387 3388 3389 3390
		rc = -ENODEV;
		goto fail;
	}

3391
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3392 3393

	/* configure device according to the new ID */
3394
	rc = ata_dev_configure(dev);
3395 3396
	if (rc == 0)
		return 0;
3397 3398

 fail:
3399
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3400 3401 3402
	return rc;
}

3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },

3441
	/* Weird ATAPI devices */
3442 3443
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |
						ATA_HORKAGE_DMA_RW_ONLY },
3444

3445 3446 3447 3448 3449
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3450 3451
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3452 3453
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3454 3455
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3456 3457 3458 3459 3460
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
3461 3462 3463 3464 3465

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3466
};
3467

3468
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3469
{
T
Tejun Heo 已提交
3470 3471
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3472
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3473

T
Tejun Heo 已提交
3474 3475
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
3476

3477
	while (ad->model_num) {
T
Tejun Heo 已提交
3478
		if (!strcmp(ad->model_num, model_num)) {
3479 3480
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3481
			if (!strcmp(ad->model_rev, model_rev))
3482
				return ad->horkage;
3483
		}
3484
		ad++;
3485
	}
L
Linus Torvalds 已提交
3486 3487 3488
	return 0;
}

3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500
static int ata_dma_blacklisted(const struct ata_device *dev)
{
	/* We don't support polling DMA.
	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
	 */
	if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
	return (ata_device_blacklisted(dev) & ATA_HORKAGE_NODMA) ? 1 : 0;
}

3501 3502 3503 3504
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3505 3506 3507 3508
 *	Compute supported xfermask of @dev and store it in
 *	dev->*_mask.  This function is responsible for applying all
 *	known limits including host controller limits, device
 *	blacklist, etc...
3509 3510 3511 3512
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3513
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3514
{
T
Tejun Heo 已提交
3515
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3516
	struct ata_host *host = ap->host;
3517
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3518

3519
	/* controller modes available */
3520 3521 3522
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3523
	/* drive modes available */
3524 3525 3526
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3527

3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538
	/*
	 *	CFA Advanced TrueIDE timings are not allowed on a shared
	 *	cable
	 */
	if (ata_dev_pair(dev)) {
		/* No PIO5 or PIO6 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
		/* No MWDMA3 or MWDMA 4 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
	}

3539 3540
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3541 3542
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3543
	}
3544

3545 3546
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3547 3548 3549
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3550
	}
3551

J
Jeff Garzik 已提交
3552 3553 3554
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

3555
	if (ap->ops->mode_filter)
3556
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3557

3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

3577 3578
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3579 3580 3581 3582 3583 3584
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3585 3586 3587
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3588
 *	LOCKING:
J
Jeff Garzik 已提交
3589
 *	PCI/etc. bus probe sem.
3590 3591 3592
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3593 3594
 */

T
Tejun Heo 已提交
3595
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3596
{
3597
	struct ata_taskfile tf;
3598
	unsigned int err_mask;
L
Linus Torvalds 已提交
3599 3600 3601 3602

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

T
Tejun Heo 已提交
3603
	ata_tf_init(dev, &tf);
3604 3605 3606 3607 3608
	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;
L
Linus Torvalds 已提交
3609

T
Tejun Heo 已提交
3610
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3611

3612 3613
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3614 3615
}

3616 3617 3618
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3619 3620
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3621 3622
 *
 *	LOCKING:
3623 3624 3625 3626
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3627
 */
T
Tejun Heo 已提交
3628 3629
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3630
{
3631
	struct ata_taskfile tf;
3632
	unsigned int err_mask;
3633 3634 3635

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3636
		return AC_ERR_INVALID;
3637 3638 3639 3640

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

T
Tejun Heo 已提交
3641
	ata_tf_init(dev, &tf);
3642 3643 3644 3645 3646
	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 */
3647

T
Tejun Heo 已提交
3648
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3649

3650 3651
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3652 3653
}

L
Linus Torvalds 已提交
3654
/**
J
Jeff Garzik 已提交
3655 3656 3657 3658
 *	ata_sg_clean - Unmap DMA memory associated with command
 *	@qc: Command containing DMA memory to be released
 *
 *	Unmap all mapped DMA memory associated with this command.
L
Linus Torvalds 已提交
3659 3660
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3661
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3662
 */
3663
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3664 3665
{
	struct ata_port *ap = qc->ap;
3666
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3667
	int dir = qc->dma_dir;
3668
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3669

3670 3671
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3672 3673

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3674
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3675

J
Jeff Garzik 已提交
3676
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3677

3678 3679 3680 3681 3682 3683 3684 3685
	/* 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) {
3686
		if (qc->n_elem)
3687
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3688 3689 3690 3691 3692 3693
		/* 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);
3694
			kunmap_atomic(addr, KM_IRQ0);
3695 3696
		}
	} else {
3697
		if (qc->n_elem)
3698
			dma_unmap_single(ap->dev,
3699 3700
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3701 3702 3703 3704 3705 3706
		/* restore sg */
		sg->length += qc->pad_len;
		if (pad_buf)
			memcpy(qc->buf_virt + sg->length - qc->pad_len,
			       pad_buf, qc->pad_len);
	}
L
Linus Torvalds 已提交
3707 3708

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3709
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3710 3711 3712 3713 3714 3715
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3716 3717 3718
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3719
 *	LOCKING:
J
Jeff Garzik 已提交
3720
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3721 3722 3723 3724 3725
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3726 3727
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3728

3729
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3730
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3731 3732

	idx = 0;
3733
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766
		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
 *
J
Jeff Garzik 已提交
3767 3768 3769 3770
 *	Allow low-level driver to filter ATA PACKET commands, returning
 *	a status indicating whether or not it is OK to use DMA for the
 *	supplied PACKET command.
 *
L
Linus Torvalds 已提交
3771
 *	LOCKING:
J
Jeff Garzik 已提交
3772
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3773
 *
L
Linus Torvalds 已提交
3774 3775 3776 3777 3778 3779 3780 3781
 *	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 */

3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801
	/* some drives can only do ATAPI DMA on read/write */
	if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
		struct scsi_cmnd *cmd = qc->scsicmd;
		u8 *scsicmd = cmd->cmnd;

		switch (scsicmd[0]) {
		case READ_10:
		case WRITE_10:
		case READ_12:
		case WRITE_12:
		case READ_6:
		case WRITE_6:
			/* atapi dma maybe ok */
			break;
		default:
			/* turn off atapi dma */
			return 1;
		}
	}

L
Linus Torvalds 已提交
3802 3803 3804 3805 3806 3807 3808 3809 3810
	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
 *
J
Jeff Garzik 已提交
3811 3812
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3813
 *	LOCKING:
J
Jeff Garzik 已提交
3814
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3815 3816 3817 3818 3819 3820 3821 3822 3823
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3824 3825
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3826 3827 3828 3829 3830 3831 3832 3833 3834 3835
/**
 *	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:
J
Jeff Garzik 已提交
3836
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3837 3838
 */

L
Linus Torvalds 已提交
3839 3840 3841 3842
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3843
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3844
	qc->n_elem = 1;
3845
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3846
	qc->buf_virt = buf;
3847
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3848

3849
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3850 3851
}

J
Jeff Garzik 已提交
3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862
/**
 *	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:
J
Jeff Garzik 已提交
3863
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3864 3865
 */

L
Linus Torvalds 已提交
3866 3867 3868 3869
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3870
	qc->__sg = sg;
L
Linus Torvalds 已提交
3871
	qc->n_elem = n_elem;
3872
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3873 3874 3875
}

/**
J
Jeff Garzik 已提交
3876 3877 3878 3879
 *	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
3880 3881
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3882
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3883 3884
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3885
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3886 3887 3888 3889 3890 3891
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3892
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3893
	dma_addr_t dma_address;
3894
	int trim_sg = 0;
L
Linus Torvalds 已提交
3895

3896 3897 3898 3899 3900 3901
	/* 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;

3902
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913

		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;
3914 3915
		if (sg->length == 0)
			trim_sg = 1;
3916 3917 3918 3919 3920

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

3921 3922
	if (trim_sg) {
		qc->n_elem--;
3923 3924 3925
		goto skip_map;
	}

3926
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3927
				     sg->length, dir);
3928 3929 3930
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3931
		return -1;
3932
	}
L
Linus Torvalds 已提交
3933 3934

	sg_dma_address(sg) = dma_address;
3935
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3936

3937
skip_map:
L
Linus Torvalds 已提交
3938 3939 3940 3941 3942 3943 3944
	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
3945 3946 3947 3948
 *	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
3949 3950
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3951
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3952 3953
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3954
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3955 3956 3957 3958 3959 3960
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3961 3962
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3963
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3964

T
Tejun Heo 已提交
3965
	VPRINTK("ENTER, ata%u\n", ap->print_id);
3966
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3967

3968 3969 3970 3971 3972 3973 3974
	/* 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;

3975
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989

		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);
3990
			kunmap_atomic(addr, KM_IRQ0);
3991 3992 3993 3994 3995 3996
		}

		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;
3997 3998
		if (lsg->length == 0)
			trim_sg = 1;
3999 4000 4001 4002 4003

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

4004 4005 4006 4007 4008 4009 4010 4011 4012
	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
4013
	dir = qc->dma_dir;
4014
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4015 4016 4017
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4018
		return -1;
4019
	}
L
Linus Torvalds 已提交
4020 4021 4022

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

4023
skip_map:
L
Linus Torvalds 已提交
4024 4025 4026 4027 4028
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4029
/**
4030
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4031 4032 4033 4034 4035 4036 4037 4038
 *	@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
4039
 *	Inherited from caller.
E
Edward Falk 已提交
4040
 */
L
Linus Torvalds 已提交
4041 4042 4043 4044 4045 4046 4047 4048 4049 4050
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
4051
/**
T
Tejun Heo 已提交
4052
 *	ata_data_xfer - Transfer data by PIO
4053
 *	@adev: device to target
A
Albert Lee 已提交
4054 4055
 *	@buf: data buffer
 *	@buflen: buffer length
4056
 *	@write_data: read/write
A
Albert Lee 已提交
4057 4058 4059 4060 4061 4062
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4063 4064
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4065
{
4066
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4067
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4068

A
Albert Lee 已提交
4069
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4070
	if (write_data)
T
Tejun Heo 已提交
4071
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4072
	else
T
Tejun Heo 已提交
4073
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4074 4075 4076 4077 4078 4079 4080 4081

	/* 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);
T
Tejun Heo 已提交
4082
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4083
		} else {
T
Tejun Heo 已提交
4084
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4085 4086 4087
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4088 4089
}

4090
/**
T
Tejun Heo 已提交
4091
 *	ata_data_xfer_noirq - Transfer data by PIO
4092 4093 4094 4095 4096
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4097
 *	Transfer data from/to the device data register by PIO. Do the
4098 4099 4100 4101 4102
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4103 4104
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4105 4106 4107
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4108
	ata_data_xfer(adev, buf, buflen, write_data);
4109 4110 4111 4112
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4113
/**
4114
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4115 4116
 *	@qc: Command on going
 *
4117
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4118 4119 4120 4121 4122
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4123 4124 4125
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4126
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4127 4128 4129 4130 4131
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4132
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4133
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4134 4135

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4136
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4137 4138 4139 4140 4141 4142 4143

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

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

4144 4145 4146
	if (PageHighMem(page)) {
		unsigned long flags;

4147
		/* FIXME: use a bounce buffer */
4148 4149
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4150

4151
		/* do the actual data transfer */
4152
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4153

4154 4155 4156 4157
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4158
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4159
	}
L
Linus Torvalds 已提交
4160

4161 4162
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4163

T
Tejun Heo 已提交
4164
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4165 4166 4167 4168 4169
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4170
/**
4171
 *	ata_pio_sectors - Transfer one or many sectors.
4172 4173
 *	@qc: Command on going
 *
4174
 *	Transfer one or many sectors of data from/to the
4175 4176 4177 4178 4179
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4180

4181 4182 4183 4184 4185 4186
static void ata_pio_sectors(struct ata_queued_cmd *qc)
{
	if (is_multi_taskfile(&qc->tf)) {
		/* READ/WRITE MULTIPLE */
		unsigned int nsect;

J
Jeff Garzik 已提交
4187
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4188

4189
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4190
			    qc->dev->multi_count);
4191 4192 4193 4194 4195 4196
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212
/**
 *	atapi_send_cdb - Write CDB bytes to hardware
 *	@ap: Port to which ATAPI device is attached.
 *	@qc: Taskfile currently active
 *
 *	When device has indicated its readiness to accept
 *	a CDB, this function is called.  Send the CDB.
 *
 *	LOCKING:
 *	caller.
 */

static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
{
	/* send SCSI cdb */
	DPRINTK("send cdb\n");
4213
	WARN_ON(qc->dev->cdb_len < 12);
4214

4215
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230
	ata_altstatus(ap); /* flush */

	switch (qc->tf.protocol) {
	case ATA_PROT_ATAPI:
		ap->hsm_task_state = HSM_ST;
		break;
	case ATA_PROT_ATAPI_NODATA:
		ap->hsm_task_state = HSM_ST_LAST;
		break;
	case ATA_PROT_ATAPI_DMA:
		ap->hsm_task_state = HSM_ST_LAST;
		/* initiate bmdma */
		ap->ops->bmdma_start(qc);
		break;
	}
L
Linus Torvalds 已提交
4231 4232
}

A
Albert Lee 已提交
4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244
/**
 *	__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
4245 4246 4247
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4248
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4249 4250 4251 4252 4253
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4254
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4255
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4256 4257

next_sg:
4258
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4259
		/*
4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270
		 * 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 */
4271 4272
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4273 4274

		for (i = 0; i < words; i++)
4275
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4276

A
Albert Lee 已提交
4277
		ap->hsm_task_state = HSM_ST_LAST;
4278 4279 4280
		return;
	}

4281
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4282 4283 4284 4285 4286 4287 4288 4289

	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;

4290
	/* don't overrun current sg */
4291
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4292 4293 4294 4295

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

4296 4297
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4298 4299 4300
	if (PageHighMem(page)) {
		unsigned long flags;

4301
		/* FIXME: use bounce buffer */
4302 4303
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4304

4305
		/* do the actual data transfer */
4306
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4307

4308 4309 4310 4311
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4312
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4313
	}
L
Linus Torvalds 已提交
4314 4315 4316 4317 4318

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

4319
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4320 4321 4322 4323
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4324
	if (bytes)
L
Linus Torvalds 已提交
4325 4326 4327
		goto next_sg;
}

A
Albert Lee 已提交
4328 4329 4330 4331 4332 4333 4334 4335 4336 4337
/**
 *	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
4338 4339 4340 4341 4342 4343 4344
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;

4345 4346 4347 4348 4349 4350 4351 4352 4353 4354
	/* Abuse qc->result_tf for temp storage of intermediate TF
	 * here to save some kernel stack usage.
	 * For normal completion, qc->result_tf is not relevant. For
	 * error, qc->result_tf is later overwritten by ata_qc_complete().
	 * So, the correctness of qc->result_tf is not affected.
	 */
	ap->ops->tf_read(ap, &qc->result_tf);
	ireason = qc->result_tf.nsect;
	bc_lo = qc->result_tf.lbam;
	bc_hi = qc->result_tf.lbah;
L
Linus Torvalds 已提交
4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365
	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;

T
Tejun Heo 已提交
4366
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4367

L
Linus Torvalds 已提交
4368 4369 4370 4371 4372
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4373
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4374
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4375
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4376 4377 4378
}

/**
4379 4380 4381
 *	ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
 *	@ap: the target ata_port
 *	@qc: qc on going
L
Linus Torvalds 已提交
4382
 *
4383 4384
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4385
 */
4386 4387

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4388
{
4389 4390
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4391

4392 4393 4394 4395
	if (ap->hsm_task_state == HSM_ST_FIRST) {
		if (qc->tf.protocol == ATA_PROT_PIO &&
		    (qc->tf.flags & ATA_TFLAG_WRITE))
		    return 1;
L
Linus Torvalds 已提交
4396

4397 4398 4399
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4400 4401
	}

4402 4403
	return 0;
}
L
Linus Torvalds 已提交
4404

T
Tejun Heo 已提交
4405 4406 4407 4408 4409 4410 4411 4412
/**
 *	ata_hsm_qc_complete - finish a qc running on standard HSM
 *	@qc: Command to complete
 *	@in_wq: 1 if called from workqueue, 0 otherwise
 *
 *	Finish @qc which is running on standard HSM.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4413
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4414 4415 4416 4417 4418 4419 4420 4421 4422
 *	Otherwise, none on entry and grabs host lock.
 */
static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
{
	struct ata_port *ap = qc->ap;
	unsigned long flags;

	if (ap->ops->error_handler) {
		if (in_wq) {
4423
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4424

J
Jeff Garzik 已提交
4425 4426
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4427 4428 4429 4430
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4431
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4432 4433 4434 4435 4436
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4437
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4438 4439 4440 4441 4442 4443 4444 4445
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4446
			spin_lock_irqsave(ap->lock, flags);
4447
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4448
			ata_qc_complete(qc);
4449
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4450 4451 4452
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4453

4454
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4455 4456
}

4457 4458 4459 4460 4461 4462 4463 4464 4465 4466
/**
 *	ata_hsm_move - move the HSM to the next state.
 *	@ap: the target ata_port
 *	@qc: qc on going
 *	@status: current device status
 *	@in_wq: 1 if called from workqueue, 0 otherwise
 *
 *	RETURNS:
 *	1 when poll next status needed, 0 otherwise.
 */
4467 4468
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4469
{
4470 4471 4472
	unsigned long flags = 0;
	int poll_next;

4473 4474
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4475 4476 4477 4478
	/* Make sure ata_qc_issue_prot() does not throw things
	 * like DMA polling into the workqueue. Notice that
	 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
	 */
4479
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4480

4481
fsm_start:
4482
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4483
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4484

4485 4486
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4487 4488 4489 4490 4491 4492 4493 4494
		/* Send first data block or PACKET CDB */

		/* If polling, we will stay in the work queue after
		 * sending the data. Otherwise, interrupt handler
		 * takes over after sending the data.
		 */
		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);

4495
		/* check device status */
4496 4497 4498 4499 4500 4501 4502 4503 4504
		if (unlikely((status & ATA_DRQ) == 0)) {
			/* handle BSY=0, DRQ=0 as error */
			if (likely(status & (ATA_ERR | ATA_DF)))
				/* device stops HSM for abort/error */
				qc->err_mask |= AC_ERR_DEV;
			else
				/* HSM violation. Let EH handle this */
				qc->err_mask |= AC_ERR_HSM;

A
Albert Lee 已提交
4505
			ap->hsm_task_state = HSM_ST_ERR;
4506
			goto fsm_start;
L
Linus Torvalds 已提交
4507 4508
		}

4509 4510
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4511 4512 4513
		 * We ignore DRQ here and stop the HSM by
		 * changing hsm_task_state to HSM_ST_ERR and
		 * let the EH abort the command or reset the device.
4514 4515
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4516 4517
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4518
			qc->err_mask |= AC_ERR_HSM;
4519 4520
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4521
		}
L
Linus Torvalds 已提交
4522

4523 4524 4525 4526 4527 4528
		/* Send the CDB (atapi) or the first data block (ata pio out).
		 * During the state transition, interrupt handler shouldn't
		 * be invoked before the data transfer is complete and
		 * hsm_task_state is changed. Hence, the following locking.
		 */
		if (in_wq)
4529
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4530

4531 4532 4533 4534
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4535

4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547
			/* ata_pio_sectors() might change the state
			 * to HSM_ST_LAST. so, the state is changed here
			 * before ata_pio_sectors().
			 */
			ap->hsm_task_state = HSM_ST;
			ata_pio_sectors(qc);
			ata_altstatus(ap); /* flush */
		} else
			/* send CDB */
			atapi_send_cdb(ap, qc);

		if (in_wq)
4548
			spin_unlock_irqrestore(ap->lock, flags);
4549 4550 4551 4552

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4553
		break;
4554

4555 4556 4557 4558 4559
	case HSM_ST:
		/* complete command or read/write the data register */
		if (qc->tf.protocol == ATA_PROT_ATAPI) {
			/* ATAPI PIO protocol */
			if ((status & ATA_DRQ) == 0) {
4560 4561 4562
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4563 4564 4565
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4566

4567 4568
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4569 4570 4571
			 * We ignore DRQ here and stop the HSM by
			 * changing hsm_task_state to HSM_ST_ERR and
			 * let the EH abort the command or reset the device.
4572 4573
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4574 4575 4576
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4577
				qc->err_mask |= AC_ERR_HSM;
4578 4579
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4580
			}
L
Linus Torvalds 已提交
4581

4582
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4583

4584 4585 4586
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4587

4588 4589 4590 4591
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4592 4593 4594 4595
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4596 4597 4598 4599 4600 4601
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4602

4603 4604 4605
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4606

4607 4608 4609 4610 4611 4612 4613 4614 4615
			/* For PIO reads, some devices may ask for
			 * data transfer (DRQ=1) alone with ERR=1.
			 * We respect DRQ here and transfer one
			 * block of junk data before changing the
			 * hsm_task_state to HSM_ST_ERR.
			 *
			 * For PIO writes, ERR=1 DRQ=1 doesn't make
			 * sense since the data block has been
			 * transferred to the device.
4616 4617 4618 4619
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4620 4621 4622 4623 4624 4625 4626

				if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
					ata_pio_sectors(qc);
					ata_altstatus(ap);
					status = ata_wait_idle(ap);
				}

4627 4628 4629
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4630 4631 4632 4633 4634 4635
				/* ata_pio_sectors() might change the
				 * state to HSM_ST_LAST. so, the state
				 * is changed after ata_pio_sectors().
				 */
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4636 4637
			}

4638 4639 4640 4641 4642 4643
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4644
				status = ata_wait_idle(ap);
4645 4646 4647 4648 4649
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4650
		poll_next = 1;
L
Linus Torvalds 已提交
4651 4652
		break;

A
Albert Lee 已提交
4653
	case HSM_ST_LAST:
4654 4655
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4656 4657 4658 4659 4660
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4661
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4662
			ap->print_id, qc->dev->devno, status);
4663

4664 4665
		WARN_ON(qc->err_mask);

4666
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4667

4668
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4669
		ata_hsm_qc_complete(qc, in_wq);
4670 4671

		poll_next = 0;
L
Linus Torvalds 已提交
4672 4673
		break;

A
Albert Lee 已提交
4674
	case HSM_ST_ERR:
4675 4676 4677 4678 4679 4680
		/* make sure qc->err_mask is available to
		 * know what's wrong and recover
		 */
		WARN_ON(qc->err_mask == 0);

		ap->hsm_task_state = HSM_ST_IDLE;
4681

4682
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4683
		ata_hsm_qc_complete(qc, in_wq);
4684 4685

		poll_next = 0;
4686 4687
		break;
	default:
4688
		poll_next = 0;
4689
		BUG();
L
Linus Torvalds 已提交
4690 4691
	}

4692
	return poll_next;
L
Linus Torvalds 已提交
4693 4694
}

4695
static void ata_pio_task(struct work_struct *work)
4696
{
4697 4698 4699
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4700
	u8 status;
4701
	int poll_next;
4702

J
Jeff Garzik 已提交
4703
fsm_start:
4704
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4705

4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717
	/*
	 * 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, queue delayed work.
	 */
	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) {
4718
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4719 4720
			return;
		}
4721 4722
	}

4723 4724
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4725

4726 4727 4728 4729
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4730
		goto fsm_start;
4731 4732
}

L
Linus Torvalds 已提交
4733 4734 4735 4736 4737 4738
/**
 *	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
4739
 *	None.
L
Linus Torvalds 已提交
4740 4741 4742 4743 4744 4745 4746
 */

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

4747
	/* no command while frozen */
4748
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4749 4750
		return NULL;

4751 4752
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4753
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4754
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

/**
 *	ata_qc_new_init - Request an available ATA command, and initialize it
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4769
 *	None.
L
Linus Torvalds 已提交
4770 4771
 */

T
Tejun Heo 已提交
4772
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4773
{
T
Tejun Heo 已提交
4774
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4775 4776 4777 4778 4779 4780 4781 4782
	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
4783
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796
	}

	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
4797
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4798 4799 4800
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4801 4802 4803
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4804
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4805

4806 4807 4808 4809
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4810
		clear_bit(tag, &ap->qc_allocated);
4811
	}
L
Linus Torvalds 已提交
4812 4813
}

4814
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4815
{
4816 4817
	struct ata_port *ap = qc->ap;

4818 4819
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4820 4821 4822 4823

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

4824
	/* command should be marked inactive atomically with qc completion */
4825 4826 4827 4828
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4829

4830 4831 4832 4833 4834
	/* 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;
4835
	ap->qc_active &= ~(1 << qc->tag);
4836

L
Linus Torvalds 已提交
4837
	/* call completion callback */
4838
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4839 4840
}

4841 4842 4843 4844 4845
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4846
	ap->ops->tf_read(ap, &qc->result_tf);
4847 4848
}

4849 4850 4851 4852 4853 4854 4855 4856 4857
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *	@err_mask: ATA Status register contents
 *
 *	Indicate to the mid and upper layers that an ATA
 *	command has completed, with either an ok or not-ok status.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4858
 *	spin_lock_irqsave(host lock)
4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877
 */
void ata_qc_complete(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	/* XXX: New EH and old EH use different mechanisms to
	 * synchronize EH with regular execution path.
	 *
	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
	 * Normal execution path is responsible for not accessing a
	 * failed qc.  libata core enforces the rule by returning NULL
	 * from ata_qc_from_tag() for failed qcs.
	 *
	 * Old EH depends on ata_qc_complete() nullifying completion
	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
	 * not synchronize with interrupt handler.  Only PIO task is
	 * taken care of.
	 */
	if (ap->ops->error_handler) {
4878
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4879 4880 4881 4882 4883 4884 4885

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

		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			if (!ata_tag_internal(qc->tag)) {
				/* always fill result TF for failed qc */
4886
				fill_result_tf(qc);
4887 4888 4889 4890 4891 4892 4893
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4894
			fill_result_tf(qc);
4895 4896 4897 4898 4899 4900 4901 4902

		__ata_qc_complete(qc);
	} else {
		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
			return;

		/* read result TF if failed or requested */
		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4903
			fill_result_tf(qc);
4904 4905 4906 4907 4908

		__ata_qc_complete(qc);
	}
}

4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *	@finish_qc: LLDD callback invoked before completing a qc
 *
 *	Complete in-flight commands.  This functions is meant to be
 *	called from low-level driver's interrupt routine to complete
 *	requests normally.  ap->qc_active and @qc_active is compared
 *	and commands are completed accordingly.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4921
 *	spin_lock_irqsave(host lock)
4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
			     void (*finish_qc)(struct ata_queued_cmd *))
{
	int nr_done = 0;
	u32 done_mask;
	int i;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
		ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
				"(%08x->%08x)\n", ap->qc_active, qc_active);
		return -EINVAL;
	}

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

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

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

	return nr_done;
}

L
Linus Torvalds 已提交
4958 4959 4960 4961 4962
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4963
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991
	case ATA_PROT_DMA:
	case ATA_PROT_ATAPI_DMA:
		return 1;

	case ATA_PROT_ATAPI:
	case ATA_PROT_PIO:
		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:
J
Jeff Garzik 已提交
4992
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4993
 */
4994
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4995 4996 4997
{
	struct ata_port *ap = qc->ap;

4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011
	/* Make sure only one non-NCQ command is outstanding.  The
	 * check is skipped for old EH because it reuses active qc to
	 * request ATAPI sense.
	 */
	WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));

	if (qc->tf.protocol == ATA_PROT_NCQ) {
		WARN_ON(ap->sactive & (1 << qc->tag));
		ap->sactive |= 1 << qc->tag;
	} else {
		WARN_ON(ap->sactive);
		ap->active_tag = qc->tag;
	}

5012
	qc->flags |= ATA_QCFLAG_ACTIVE;
5013
	ap->qc_active |= 1 << qc->tag;
5014

L
Linus Torvalds 已提交
5015 5016 5017
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5018
				goto sg_err;
L
Linus Torvalds 已提交
5019 5020
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5021
				goto sg_err;
L
Linus Torvalds 已提交
5022 5023 5024 5025 5026 5027 5028
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5029 5030 5031 5032
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5033

5034 5035
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5036 5037 5038
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049
}

/**
 *	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
5050 5051
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5052
 *	LOCKING:
J
Jeff Garzik 已提交
5053
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5054 5055
 *
 *	RETURNS:
5056
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5057 5058
 */

5059
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5060 5061 5062
{
	struct ata_port *ap = qc->ap;

5063 5064 5065 5066 5067 5068
	/* Use polling pio if the LLD doesn't handle
	 * interrupt driven pio and atapi CDB interrupt.
	 */
	if (ap->flags & ATA_FLAG_PIO_POLLING) {
		switch (qc->tf.protocol) {
		case ATA_PROT_PIO:
5069
		case ATA_PROT_NODATA:
5070 5071 5072 5073 5074 5075
		case ATA_PROT_ATAPI:
		case ATA_PROT_ATAPI_NODATA:
			qc->tf.flags |= ATA_TFLAG_POLLING;
			break;
		case ATA_PROT_ATAPI_DMA:
			if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
5076
				/* see ata_dma_blacklisted() */
5077 5078 5079 5080 5081 5082 5083
				BUG();
			break;
		default:
			break;
		}
	}

5084 5085 5086 5087 5088 5089 5090 5091
	/* Some controllers show flaky interrupt behavior after
	 * setting xfer mode.  Use polling instead.
	 */
	if (unlikely(qc->tf.command == ATA_CMD_SET_FEATURES &&
		     qc->tf.feature == SETFEATURES_XFER) &&
	    (ap->flags & ATA_FLAG_SETXFER_POLLING))
		qc->tf.flags |= ATA_TFLAG_POLLING;

5092
	/* select the device */
L
Linus Torvalds 已提交
5093 5094
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5095
	/* start the command */
L
Linus Torvalds 已提交
5096 5097
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5098 5099 5100
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5101
		ata_tf_to_host(ap, &qc->tf);
5102 5103 5104
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5105
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5106

L
Linus Torvalds 已提交
5107 5108 5109
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5110
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5111

L
Linus Torvalds 已提交
5112 5113 5114
		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 */
5115
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5116 5117
		break;

5118 5119 5120
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5121

J
Jeff Garzik 已提交
5122
		ata_tf_to_host(ap, &qc->tf);
5123

5124 5125 5126
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5127
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5128 5129

			/* always send first data block using
5130
			 * the ata_pio_task() codepath.
5131
			 */
5132
		} else {
5133 5134 5135 5136
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5137
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5138 5139 5140 5141

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5142 5143
		}

L
Linus Torvalds 已提交
5144 5145 5146 5147
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5148 5149 5150
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5151
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5152

5153 5154 5155 5156 5157
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
		    (qc->tf.flags & ATA_TFLAG_POLLING))
5158
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5159 5160 5161
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5162
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5163

L
Linus Torvalds 已提交
5164 5165
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5166 5167 5168 5169
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5170
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5171 5172 5173 5174
		break;

	default:
		WARN_ON(1);
5175
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190
	}

	return 0;
}

/**
 *	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:
J
Jeff Garzik 已提交
5191
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5192 5193 5194 5195 5196 5197 5198 5199
 *
 *	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)
{
5200
	struct ata_eh_info *ehi = &ap->eh_info;
5201
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5202

5203
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5204
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5205

5206 5207 5208
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5209 5210 5211
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5212

5213 5214 5215 5216 5217
		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
		 * The flag was turned on only for atapi devices.
		 * No need to check is_atapi_taskfile(&qc->tf) again.
		 */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
L
Linus Torvalds 已提交
5218 5219
			goto idle_irq;
		break;
5220 5221 5222 5223 5224
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
5225 5226
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5227 5228 5229 5230 5231 5232 5233

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

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
5234 5235 5236 5237 5238 5239

			if (unlikely(host_stat & ATA_DMA_ERR)) {
				/* error when transfering data to/from memory */
				qc->err_mask |= AC_ERR_HOST_BUS;
				ap->hsm_task_state = HSM_ST_ERR;
			}
5240 5241 5242 5243
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5244 5245 5246 5247
	default:
		goto idle_irq;
	}

5248 5249 5250 5251
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5252

5253 5254 5255 5256
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5257

5258 5259
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5260

5261
	ata_hsm_move(ap, qc, status, 0);
5262 5263 5264 5265 5266

	if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
				       qc->tf.protocol == ATA_PROT_ATAPI_DMA))
		ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);

L
Linus Torvalds 已提交
5267 5268 5269 5270 5271 5272 5273
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5274
		ap->ops->irq_ack(ap, 0); /* debug trap */
5275
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5276
		return 1;
L
Linus Torvalds 已提交
5277 5278 5279 5280 5281 5282 5283
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5284
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5285
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5286
 *
J
Jeff Garzik 已提交
5287 5288 5289
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5290
 *	LOCKING:
J
Jeff Garzik 已提交
5291
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5292 5293
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5294
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5295 5296
 */

5297
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5298
{
J
Jeff Garzik 已提交
5299
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5300 5301 5302 5303 5304
	unsigned int i;
	unsigned int handled = 0;
	unsigned long flags;

	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
J
Jeff Garzik 已提交
5305
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5306

J
Jeff Garzik 已提交
5307
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5308 5309
		struct ata_port *ap;

J
Jeff Garzik 已提交
5310
		ap = host->ports[i];
5311
		if (ap &&
J
Jeff Garzik 已提交
5312
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5313 5314 5315
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5316
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5317
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5318 5319 5320 5321
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5322
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5323 5324 5325 5326

	return IRQ_RETVAL(handled);
}

5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463
/**
 *	sata_scr_valid - test whether SCRs are accessible
 *	@ap: ATA port to test SCR accessibility for
 *
 *	Test whether SCRs are accessible for @ap.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
int sata_scr_valid(struct ata_port *ap)
{
	return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
}

/**
 *	sata_scr_read - read SCR register of the specified port
 *	@ap: ATA port to read SCR for
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
 *	Read SCR register @reg of @ap into *@val.  This function is
 *	guaranteed to succeed if the cable type of the port is SATA
 *	and the port implements ->scr_read.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
{
	if (sata_scr_valid(ap)) {
		*val = ap->ops->scr_read(ap, reg);
		return 0;
	}
	return -EOPNOTSUPP;
}

/**
 *	sata_scr_write - write SCR register of the specified port
 *	@ap: ATA port to write SCR for
 *	@reg: SCR to write
 *	@val: value to write
 *
 *	Write @val to SCR register @reg of @ap.  This function is
 *	guaranteed to succeed if the cable type of the port is SATA
 *	and the port implements ->scr_read.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
int sata_scr_write(struct ata_port *ap, int reg, u32 val)
{
	if (sata_scr_valid(ap)) {
		ap->ops->scr_write(ap, reg, val);
		return 0;
	}
	return -EOPNOTSUPP;
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
 *	@ap: ATA port to write SCR for
 *	@reg: SCR to write
 *	@val: value to write
 *
 *	This function is identical to sata_scr_write() except that this
 *	function performs flush after writing to the register.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
{
	if (sata_scr_valid(ap)) {
		ap->ops->scr_write(ap, reg, val);
		ap->ops->scr_read(ap, reg);
		return 0;
	}
	return -EOPNOTSUPP;
}

/**
 *	ata_port_online - test whether the given port is online
 *	@ap: ATA port to test
 *
 *	Test whether @ap is online.  Note that this function returns 0
 *	if online status of @ap cannot be obtained, so
 *	ata_port_online(ap) != !ata_port_offline(ap).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
int ata_port_online(struct ata_port *ap)
{
	u32 sstatus;

	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
		return 1;
	return 0;
}

/**
 *	ata_port_offline - test whether the given port is offline
 *	@ap: ATA port to test
 *
 *	Test whether @ap is offline.  Note that this function returns
 *	0 if offline status of @ap cannot be obtained, so
 *	ata_port_online(ap) != !ata_port_offline(ap).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
int ata_port_offline(struct ata_port *ap)
{
	u32 sstatus;

	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
		return 1;
	return 0;
}
E
Edward Falk 已提交
5464

5465
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5466
{
5467
	unsigned int err_mask;
J
Jens Axboe 已提交
5468 5469 5470 5471 5472
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5473
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5474 5475 5476 5477
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5478 5479 5480 5481 5482 5483 5484
	err_mask = ata_do_simple_cmd(dev, cmd);
	if (err_mask) {
		ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
		return -EIO;
	}

	return 0;
J
Jens Axboe 已提交
5485 5486
}

5487
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5488 5489 5490
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5491 5492 5493 5494
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5495 5496
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535

		/* Previous resume operation might still be in
		 * progress.  Wait for PM_PENDING to clear.
		 */
		if (ap->pflags & ATA_PFLAG_PM_PENDING) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
		}

		/* request PM ops to EH */
		spin_lock_irqsave(ap->lock, flags);

		ap->pm_mesg = mesg;
		if (wait) {
			rc = 0;
			ap->pm_result = &rc;
		}

		ap->pflags |= ATA_PFLAG_PM_PENDING;
		ap->eh_info.action |= action;
		ap->eh_info.flags |= ehi_flags;

		ata_port_schedule_eh(ap);

		spin_unlock_irqrestore(ap->lock, flags);

		/* wait and check result */
		if (wait) {
			ata_port_wait_eh(ap);
			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
			if (rc)
				return rc;
		}
	}

	return 0;
}

/**
J
Jeff Garzik 已提交
5536 5537
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5538 5539
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5540
 *	Suspend @host.  Actual operation is performed by EH.  This
5541 5542 5543 5544 5545 5546 5547 5548 5549
 *	function requests EH to perform PM operations and waits for EH
 *	to finish.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
J
Jeff Garzik 已提交
5550
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5551 5552 5553
{
	int i, j, rc;

J
Jeff Garzik 已提交
5554
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5555 5556 5557 5558 5559 5560 5561
	if (rc)
		goto fail;

	/* EH is quiescent now.  Fail if we have any ready device.
	 * This happens if hotplug occurs between completion of device
	 * suspension and here.
	 */
J
Jeff Garzik 已提交
5562 5563
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577

		for (j = 0; j < ATA_MAX_DEVICES; j++) {
			struct ata_device *dev = &ap->device[j];

			if (ata_dev_ready(dev)) {
				ata_port_printk(ap, KERN_WARNING,
						"suspend failed, device %d "
						"still active\n", dev->devno);
				rc = -EBUSY;
				goto fail;
			}
		}
	}

J
Jeff Garzik 已提交
5578
	host->dev->power.power_state = mesg;
5579 5580 5581
	return 0;

 fail:
J
Jeff Garzik 已提交
5582
	ata_host_resume(host);
5583 5584 5585 5586
	return rc;
}

/**
J
Jeff Garzik 已提交
5587 5588
 *	ata_host_resume - resume host
 *	@host: host to resume
5589
 *
J
Jeff Garzik 已提交
5590
 *	Resume @host.  Actual operation is performed by EH.  This
5591 5592 5593 5594 5595 5596
 *	function requests EH to perform PM operations and returns.
 *	Note that all resume operations are performed parallely.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
J
Jeff Garzik 已提交
5597
void ata_host_resume(struct ata_host *host)
5598
{
J
Jeff Garzik 已提交
5599 5600 5601
	ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
	host->dev->power.power_state = PMSG_ON;
5602
}
5603
#endif
5604

5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616
/**
 *	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.
 */
5617
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5618
{
5619
	struct device *dev = ap->dev;
5620
	int rc;
L
Linus Torvalds 已提交
5621

5622 5623
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5624 5625 5626
	if (!ap->prd)
		return -ENOMEM;

5627
	rc = ata_pad_alloc(ap, dev);
5628
	if (rc)
5629
		return rc;
L
Linus Torvalds 已提交
5630

5631 5632
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5633 5634 5635
	return 0;
}

5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647
/**
 *	ata_dev_init - Initialize an ata_device structure
 *	@dev: Device structure to initialize
 *
 *	Initialize @dev in preparation for probing.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
void ata_dev_init(struct ata_device *dev)
{
	struct ata_port *ap = dev->ap;
5648 5649
	unsigned long flags;

5650 5651 5652
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5653 5654
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5655
	 * host lock.
5656
	 */
5657
	spin_lock_irqsave(ap->lock, flags);
5658
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5659
	spin_unlock_irqrestore(ap->lock, flags);
5660

5661 5662
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5663 5664 5665 5666 5667
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5668
/**
5669 5670
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5671
 *
5672 5673 5674 5675
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5676
 *
L
Linus Torvalds 已提交
5677
 *	LOCKING:
5678
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5679
 */
5680
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5681
{
5682
	struct ata_port *ap;
L
Linus Torvalds 已提交
5683 5684
	unsigned int i;

5685 5686 5687 5688 5689 5690
	DPRINTK("ENTER\n");

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

J
Jeff Garzik 已提交
5691
	ap->lock = &host->lock;
5692
	ap->flags = ATA_FLAG_DISABLED;
5693
	ap->print_id = -1;
L
Linus Torvalds 已提交
5694
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5695
	ap->host = host;
5696 5697
	ap->dev = host->dev;

5698
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5699 5700
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5701 5702 5703 5704 5705 5706

#if defined(ATA_VERBOSE_DEBUG)
	/* turn on all debugging levels */
	ap->msg_enable = 0x00FF;
#elif defined(ATA_DEBUG)
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
T
Tejun Heo 已提交
5707
#else
5708
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5709
#endif
L
Linus Torvalds 已提交
5710

5711 5712 5713
	INIT_DELAYED_WORK(&ap->port_task, NULL);
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5714
	INIT_LIST_HEAD(&ap->eh_done_q);
5715
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5716

5717 5718
	ap->cbl = ATA_CBL_NONE;

5719 5720
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5721
		dev->ap = ap;
5722
		dev->devno = i;
5723
		ata_dev_init(dev);
5724
	}
L
Linus Torvalds 已提交
5725 5726 5727 5728 5729 5730 5731 5732

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

5733 5734 5735 5736 5737 5738 5739 5740
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

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

5741 5742 5743 5744
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
5745 5746 5747
			ap->ops->port_stop(ap);
	}

5748
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
5749
		host->ops->host_stop(host);
5750

5751 5752 5753
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5754 5755 5756 5757
		if (!ap)
			continue;

		if (ap->scsi_host)
5758 5759
			scsi_host_put(ap->scsi_host);

5760
		kfree(ap);
5761 5762 5763
		host->ports[i] = NULL;
	}

5764
	dev_set_drvdata(gendev, NULL);
5765 5766
}

5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return NULL;

	/* alloc a container for our list of ATA ports (buses) */
	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
	/* alloc a container for our list of ATA ports (buses) */
	host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
	if (!host)
		goto err_out;

	devres_add(dev, host);
	dev_set_drvdata(dev, host);

	spin_lock_init(&host->lock);
	host->dev = dev;
	host->n_ports = max_ports;

	/* allocate ports bound to this host */
	for (i = 0; i < max_ports; i++) {
		struct ata_port *ap;

		ap = ata_port_alloc(host);
		if (!ap)
			goto err_out;

		ap->port_no = i;
		host->ports[i] = ap;
	}

	devres_remove_group(dev, NULL);
	return host;

 err_out:
	devres_release_group(dev, NULL);
	return NULL;
}

5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

	host = ata_host_alloc(dev, n_ports);
	if (!host)
		return NULL;

	for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (ppi[j])
			pi = ppi[j++];

		ap->pio_mask = pi->pio_mask;
		ap->mwdma_mask = pi->mwdma_mask;
		ap->udma_mask = pi->udma_mask;
		ap->flags |= pi->flags;
		ap->ops = pi->port_ops;

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

	return host;
}

5881 5882 5883 5884 5885 5886 5887
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
5888 5889
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
	int i, rc;

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

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

5907 5908 5909
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
				ata_port_printk(ap, KERN_ERR, "failed to "
						"start port (errno=%d)\n", rc);
				goto err_out;
			}
		}

		ata_eh_freeze_port(ap);
	}

	host->flags |= ATA_HOST_STARTED;
	return 0;

 err_out:
	while (--i >= 0) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}
	return rc;
}

5935
/**
J
Jeff Garzik 已提交
5936 5937 5938 5939 5940
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5941 5942 5943 5944 5945
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
5946
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
5947 5948
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5949
{
J
Jeff Garzik 已提交
5950 5951 5952 5953
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5954 5955
}

5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
		dev_printk(KERN_ERR, host->dev,
			   "BUG: trying to register unstarted host\n");
		WARN_ON(1);
		return -EINVAL;
	}

	/* Blow away unused ports.  This happens when LLD can't
	 * determine the exact number of ports to allocate at
	 * allocation time.
	 */
	for (i = host->n_ports; host->ports[i]; i++)
		kfree(host->ports[i]);

	/* give ports names and add SCSI hosts */
	for (i = 0; i < host->n_ports; i++)
		host->ports[i]->print_id = ata_print_id++;

	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
		return rc;

	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int irq_line;
		u32 scontrol;
		unsigned long xfer_mask;

		/* set SATA cable type if still unset */
		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
			ap->cbl = ATA_CBL_SATA;

		/* init sata_spd_limit to the current value */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
			ap->hw_sata_spd_limit &= (1 << spd) - 1;
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

		/* report the secondary IRQ for second channel legacy */
		irq_line = host->irq;
		if (i == 1 && host->irq2)
			irq_line = host->irq2;

		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

		/* print per-port info to dmesg */
		if (!ata_port_is_dummy(ap))
			ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
					"ctl 0x%p bmdma 0x%p irq %d\n",
					ap->cbl == ATA_CBL_SATA ? 'S' : 'P',
					ata_mode_string(xfer_mask),
					ap->ioaddr.cmd_addr,
					ap->ioaddr.ctl_addr,
					ap->ioaddr.bmdma_addr,
					irq_line);
		else
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

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

		/* probe */
		if (ap->ops->error_handler) {
			struct ata_eh_info *ehi = &ap->eh_info;
			unsigned long flags;

			ata_port_probe(ap);

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

			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

			ap->pflags |= ATA_PFLAG_LOADING;
			ata_port_schedule_eh(ap);

			spin_unlock_irqrestore(ap->lock, flags);

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
			rc = ata_bus_probe(ap);
			DPRINTK("ata%u: bus probe end\n", ap->print_id);

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
	}

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

		ata_scsi_scan_host(ap);
	}

	return 0;
}

6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
	int rc;

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

	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

	rc = ata_host_register(host, sht);
	/* if failed, just free the IRQ and leave ports alone */
	if (rc)
		devm_free_irq(host->dev, irq, host);

	return rc;
}

L
Linus Torvalds 已提交
6135
/**
J
Jeff Garzik 已提交
6136 6137 6138 6139 6140 6141 6142 6143 6144 6145
 *	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
6146 6147
 *
 *	LOCKING:
J
Jeff Garzik 已提交
6148
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
6149 6150
 *
 *	RETURNS:
J
Jeff Garzik 已提交
6151
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
6152
 */
J
Jeff Garzik 已提交
6153
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
6154
{
6155
	unsigned int i;
L
Linus Torvalds 已提交
6156
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
6157
	struct ata_host *host;
6158
	int rc;
L
Linus Torvalds 已提交
6159 6160

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
6161

6162 6163 6164 6165
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
6166

6167 6168 6169 6170 6171 6172
	if (!ent->port_ops->error_handler &&
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
		dev_printk(KERN_ERR, dev, "no reset mechanism available\n");
		return 0;
	}

6173 6174 6175
	if (!devres_open_group(dev, ata_device_add, GFP_KERNEL))
		return 0;

6176 6177
	/* allocate host */
	host = ata_host_alloc(dev, ent->n_ports);
L
Linus Torvalds 已提交
6178

J
Jeff Garzik 已提交
6179 6180
	host->irq = ent->irq;
	host->irq2 = ent->irq2;
T
Tejun Heo 已提交
6181
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
6182
	host->private_data = ent->private_data;
6183 6184
	host->ops = ent->port_ops;
	host->flags = ent->_host_flags;
L
Linus Torvalds 已提交
6185

J
Jeff Garzik 已提交
6186
	for (i = 0; i < host->n_ports; i++) {
6187
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
6188

T
Tejun Heo 已提交
6189 6190 6191 6192 6193 6194
		/* dummy? */
		if (ent->dummy_port_mask & (1 << i)) {
			ap->ops = &ata_dummy_port_ops;
			continue;
		}

6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207
		if (ap->port_no == 1 && ent->pinfo2) {
			ap->pio_mask = ent->pinfo2->pio_mask;
			ap->mwdma_mask = ent->pinfo2->mwdma_mask;
			ap->udma_mask = ent->pinfo2->udma_mask;
			ap->flags |= ent->pinfo2->flags;
			ap->ops = ent->pinfo2->port_ops;
		} else {
			ap->pio_mask = ent->pio_mask;
			ap->mwdma_mask = ent->mwdma_mask;
			ap->udma_mask = ent->udma_mask;
			ap->flags |= ent->port_flags;
			ap->ops = ent->port_ops;
		}
L
Linus Torvalds 已提交
6208

6209 6210
		memcpy(&ap->ioaddr, &ent->port[ap->port_no],
		       sizeof(struct ata_ioports));
L
Linus Torvalds 已提交
6211 6212
	}

6213
	/* start and freeze ports before requesting IRQ */
6214 6215 6216 6217
	rc = ata_host_start(host);
	if (rc)
		goto err_out;

6218
	/* obtain irq, that may be shared between channels */
6219 6220
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
6221 6222 6223
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
6224
		goto err_out;
6225
	}
L
Linus Torvalds 已提交
6226

6227 6228 6229 6230 6231 6232
	/* do we have a second IRQ for the other channel, eg legacy mode */
	if (ent->irq2) {
		/* We will get weird core code crashes later if this is true
		   so trap it now */
		BUG_ON(ent->irq == ent->irq2);

6233 6234 6235
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
6236 6237 6238
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
6239
			goto err_out;
6240 6241 6242
		}
	}

6243
	/* resource acquisition complete */
T
Tejun Heo 已提交
6244
	devres_remove_group(dev, ata_device_add);
6245

6246 6247 6248 6249
	/* register */
	rc = ata_host_register(host, ent->sht);
	if (rc)
		goto err_out;
L
Linus Torvalds 已提交
6250

6251 6252
	VPRINTK("EXIT, returning %u\n", host->n_ports);
	return host->n_ports; /* success */
L
Linus Torvalds 已提交
6253

6254 6255
 err_out:
	devres_release_group(dev, ata_device_add);
6256
	VPRINTK("EXIT, returning 0\n");
L
Linus Torvalds 已提交
6257 6258 6259
	return 0;
}

6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276
/**
 *	ata_port_detach - Detach ATA port in prepration of device removal
 *	@ap: ATA port to be detached
 *
 *	Detach all ATA devices and the associated SCSI devices of @ap;
 *	then, remove the associated SCSI host.  @ap is guaranteed to
 *	be quiescent on return from this function.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_port_detach(struct ata_port *ap)
{
	unsigned long flags;
	int i;

	if (!ap->ops->error_handler)
6277
		goto skip_eh;
6278 6279

	/* tell EH we're leaving & flush EH */
6280
	spin_lock_irqsave(ap->lock, flags);
6281
	ap->pflags |= ATA_PFLAG_UNLOADING;
6282
	spin_unlock_irqrestore(ap->lock, flags);
6283 6284 6285 6286 6287 6288

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6289
	spin_lock_irqsave(ap->lock, flags);
6290 6291 6292 6293

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

6294
	spin_unlock_irqrestore(ap->lock, flags);
6295 6296 6297 6298 6299

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6300
	spin_lock_irqsave(ap->lock, flags);
6301
	ata_port_freeze(ap);	/* won't be thawed */
6302
	spin_unlock_irqrestore(ap->lock, flags);
6303 6304 6305 6306 6307 6308 6309 6310 6311 6312

	ata_port_wait_eh(ap);

	/* Flush hotplug task.  The sequence is similar to
	 * ata_port_flush_task().
	 */
	flush_workqueue(ata_aux_wq);
	cancel_delayed_work(&ap->hotplug_task);
	flush_workqueue(ata_aux_wq);

6313
 skip_eh:
6314
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6315
	scsi_remove_host(ap->scsi_host);
6316 6317
}

T
Tejun Heo 已提交
6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
}

6335 6336 6337 6338 6339
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

6340
	probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
6341 6342 6343 6344 6345 6346 6347 6348 6349 6350
	if (!probe_ent) {
		printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
		       kobject_name(&(dev->kobj)));
		return NULL;
	}

	INIT_LIST_HEAD(&probe_ent->node);
	probe_ent->dev = dev;

	probe_ent->sht = port->sht;
J
Jeff Garzik 已提交
6351
	probe_ent->port_flags = port->flags;
6352 6353 6354 6355
	probe_ent->pio_mask = port->pio_mask;
	probe_ent->mwdma_mask = port->mwdma_mask;
	probe_ent->udma_mask = port->udma_mask;
	probe_ent->port_ops = port->port_ops;
6356
	probe_ent->private_data = port->private_data;
6357 6358 6359 6360

	return probe_ent;
}

L
Linus Torvalds 已提交
6361 6362 6363
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6364 6365 6366 6367 6368 6369 6370
 *
 *	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
6371
 */
E
Edward Falk 已提交
6372

L
Linus Torvalds 已提交
6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386
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
6387

6388 6389
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6390 6391 6392 6393
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6394 6395 6396
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
6397 6398 6399 6400
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6401
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6402 6403
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6404
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6405

T
Tejun Heo 已提交
6406
	ata_host_detach(host);
L
Linus Torvalds 已提交
6407 6408 6409
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6410
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441
{
	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
6442

6443
#ifdef CONFIG_PM
6444
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6445 6446
{
	pci_save_state(pdev);
6447
	pci_disable_device(pdev);
6448

6449
	if (mesg.event == PM_EVENT_SUSPEND)
6450
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6451 6452
}

6453
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6454
{
6455 6456
	int rc;

J
Jens Axboe 已提交
6457 6458
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6459

T
Tejun Heo 已提交
6460
	rc = pcim_enable_device(pdev);
6461 6462 6463 6464 6465 6466
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
6467
	pci_set_master(pdev);
6468
	return 0;
6469 6470
}

6471
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6472
{
J
Jeff Garzik 已提交
6473
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6474 6475
	int rc = 0;

J
Jeff Garzik 已提交
6476
	rc = ata_host_suspend(host, mesg);
6477 6478 6479
	if (rc)
		return rc;

6480
	ata_pci_device_do_suspend(pdev, mesg);
6481 6482 6483 6484 6485 6486

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6487
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6488
	int rc;
6489

6490 6491 6492 6493
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6494
}
6495 6496
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6497 6498 6499 6500 6501
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6502
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6503 6504 6505 6506
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6507 6508 6509 6510 6511 6512
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6513 6514 6515 6516 6517 6518 6519
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6520
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6521 6522
}

6523
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6524 6525
module_exit(ata_exit);

6526
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6527
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546

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;
}

6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

	/* Calculate timeout _after_ the first read to make sure
	 * preceding writes reach the controller before starting to
	 * eat away the timeout.
	 */
	timeout = jiffies + (timeout_msec * HZ) / 1000;

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

	return tmp;
}

T
Tejun Heo 已提交
6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625
/*
 * Dummy port_ops
 */
static void ata_dummy_noret(struct ata_port *ap)	{ }
static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }

static u8 ata_dummy_check_status(struct ata_port *ap)
{
	return ATA_DRDY;
}

static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
{
	return AC_ERR_SYSTEM;
}

const struct ata_port_operations ata_dummy_port_ops = {
	.port_disable		= ata_port_disable,
	.check_status		= ata_dummy_check_status,
	.check_altstatus	= ata_dummy_check_status,
	.dev_select		= ata_noop_dev_select,
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
	.freeze			= ata_dummy_noret,
	.thaw			= ata_dummy_noret,
	.error_handler		= ata_dummy_noret,
	.post_internal_cmd	= ata_dummy_qc_noret,
	.irq_clear		= ata_dummy_noret,
	.port_start		= ata_dummy_ret0,
	.port_stop		= ata_dummy_noret,
};

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Linus Torvalds 已提交
6626 6627 6628 6629 6630 6631 6632
/*
 * 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.
 */

6633 6634 6635
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
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Tejun Heo 已提交
6636
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6637 6638
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6639
EXPORT_SYMBOL_GPL(ata_host_init);
6640
EXPORT_SYMBOL_GPL(ata_host_alloc);
6641
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6642
EXPORT_SYMBOL_GPL(ata_host_start);
6643
EXPORT_SYMBOL_GPL(ata_host_register);
6644
EXPORT_SYMBOL_GPL(ata_host_activate);
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Linus Torvalds 已提交
6645
EXPORT_SYMBOL_GPL(ata_device_add);
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Tejun Heo 已提交
6646
EXPORT_SYMBOL_GPL(ata_host_detach);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6649
EXPORT_SYMBOL_GPL(ata_hsm_move);
6650
EXPORT_SYMBOL_GPL(ata_qc_complete);
6651
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
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);
6657
EXPORT_SYMBOL_GPL(sata_print_link_status);
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Linus Torvalds 已提交
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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_interrupt);
6665
EXPORT_SYMBOL_GPL(ata_do_set_mode);
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Tejun Heo 已提交
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EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
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Linus Torvalds 已提交
6668
EXPORT_SYMBOL_GPL(ata_qc_prep);
6669
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
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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);
6675 6676 6677 6678 6679
EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
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Linus Torvalds 已提交
6680
EXPORT_SYMBOL_GPL(ata_port_probe);
6681
EXPORT_SYMBOL_GPL(ata_dev_disable);
6682
EXPORT_SYMBOL_GPL(sata_set_spd);
6683 6684
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6688
EXPORT_SYMBOL_GPL(ata_std_prereset);
6689
EXPORT_SYMBOL_GPL(ata_std_softreset);
6690
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6691 6692
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6693 6694
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
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Linus Torvalds 已提交
6695
EXPORT_SYMBOL_GPL(ata_port_disable);
6696
EXPORT_SYMBOL_GPL(ata_ratelimit);
6697
EXPORT_SYMBOL_GPL(ata_wait_register);
6698
EXPORT_SYMBOL_GPL(ata_busy_sleep);
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Tejun Heo 已提交
6699
EXPORT_SYMBOL_GPL(ata_port_queue_task);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6703
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6704
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
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Linus Torvalds 已提交
6705
EXPORT_SYMBOL_GPL(ata_host_intr);
6706 6707 6708 6709 6710 6711
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
EXPORT_SYMBOL_GPL(ata_port_online);
EXPORT_SYMBOL_GPL(ata_port_offline);
6712
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6713 6714
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6715
#endif /* CONFIG_PM */
6716 6717
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6718
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6719
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
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Linus Torvalds 已提交
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EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6722
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6723 6724 6725
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

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Linus Torvalds 已提交
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#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
6729
EXPORT_SYMBOL_GPL(ata_pci_init_native_host);
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Linus Torvalds 已提交
6730 6731
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6732
#ifdef CONFIG_PM
6733 6734
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6735 6736
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6737
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6738 6739
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
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Linus Torvalds 已提交
6740
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6741

6742
#ifdef CONFIG_PM
J
Jens Axboe 已提交
6743 6744
EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6745
#endif /* CONFIG_PM */
6746 6747

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6748 6749
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6750 6751 6752
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6753 6754
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
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Tejun Heo 已提交
6755
EXPORT_SYMBOL_GPL(ata_do_eh);
6756 6757 6758 6759
EXPORT_SYMBOL_GPL(ata_irq_on);
EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
EXPORT_SYMBOL_GPL(ata_irq_ack);
EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
A
Akira Iguchi 已提交
6760
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6761 6762 6763 6764 6765

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
EXPORT_SYMBOL_GPL(ata_cable_sata);