libata-core.c 155.7 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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static 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 noacpi;
module_param(noacpi, int, 0444);
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
736
		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))
744 745
		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.
 */
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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];
	}
}

826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
 *	@mode: mode to assume if we cannot tell
 *
 *	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",
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		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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}

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/**
 *	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);

A
Alan 已提交
1273
	if ((qc->flags & ATA_QCFLAG_FAILED) && !qc->err_mask) {
1274
		if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1275
			ata_dev_printk(dev, KERN_WARNING,
1276
				"zero err_mask for failed "
T
Tejun Heo 已提交
1277
				"internal command, assuming AC_ERR_OTHER\n");
1278 1279 1280
		qc->err_mask |= AC_ERR_OTHER;
	}

1281
	/* finish up */
1282
	spin_lock_irqsave(ap->lock, flags);
1283

1284
	*tf = qc->result_tf;
1285 1286 1287
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1288
	ap->active_tag = preempted_tag;
1289 1290
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1291

1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	/* 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.
	 */
1303
	if (ap->flags & ATA_FLAG_DISABLED) {
1304 1305 1306 1307
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1308
	spin_unlock_irqrestore(ap->lock, flags);
1309

1310
	return err_mask;
1311 1312
}

1313
/**
1314
 *	ata_exec_internal - execute libata internal command
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
 *	@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)
{
1335 1336
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1337

1338 1339 1340 1341 1342 1343
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1344

1345
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1346 1347
}

1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
/**
 *	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
1361
 */
1362
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1363 1364 1365 1366 1367 1368 1369 1370 1371
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1372
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1373 1374
}

1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */

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

	if (speed < 2)
		return 0;
	if (speed > 2)
		return 1;
1392

1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
	/* If we have no drive specific rule, then PIO 2 is non IORDY */

	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
		pio = adev->id[ATA_ID_EIDE_PIO];
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
				return 1;
			return 0;
		}
	}
	return 0;
}

L
Linus Torvalds 已提交
1408
/**
1409 1410 1411
 *	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)
1412
 *	@flags: ATA_READID_* flags
1413
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1414
 *
1415 1416
 *	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
1417 1418
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1419 1420
 *
 *	LOCKING:
1421 1422 1423 1424
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1425
 */
1426
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1427
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1428
{
T
Tejun Heo 已提交
1429
	struct ata_port *ap = dev->ap;
1430
	unsigned int class = *p_class;
1431
	struct ata_taskfile tf;
1432 1433 1434
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1435

1436
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1437
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1438

1439
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1440

1441
 retry:
T
Tejun Heo 已提交
1442
	ata_tf_init(dev, &tf);
1443

1444 1445
	switch (class) {
	case ATA_DEV_ATA:
1446
		tf.command = ATA_CMD_ID_ATA;
1447 1448
		break;
	case ATA_DEV_ATAPI:
1449
		tf.command = ATA_CMD_ID_ATAPI;
1450 1451 1452 1453 1454
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1455 1456
	}

1457
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467

	/* 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
1468

T
Tejun Heo 已提交
1469
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1470
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1471
	if (err_mask) {
1472
		if (err_mask & AC_ERR_NODEV_HINT) {
1473
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1474
				ap->print_id, dev->devno);
1475 1476 1477
			return -ENOENT;
		}

1478 1479
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1480 1481 1482
		goto err_out;
	}

1483
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1484

1485
	/* sanity check */
1486 1487 1488 1489 1490 1491 1492 1493 1494
	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;
1495 1496
	}

1497
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1498 1499 1500 1501 1502 1503 1504 1505 1506
		/*
		 * 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
1507
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1508 1509 1510 1511 1512 1513 1514 1515 1516
			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.
			 */
1517
			flags &= ~ATA_READID_POSTRESET;
1518 1519 1520 1521 1522
			goto retry;
		}
	}

	*p_class = class;
1523

1524 1525 1526
	return 0;

 err_out:
T
Tejun Heo 已提交
1527
	if (ata_msg_warn(ap))
1528
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1529
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1530 1531 1532
	return rc;
}

T
Tejun Heo 已提交
1533
static inline u8 ata_dev_knobble(struct ata_device *dev)
1534
{
T
Tejun Heo 已提交
1535
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1536 1537
}

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
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;
	}
1548 1549 1550 1551
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1552
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1553
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1554 1555 1556 1557 1558 1559 1560 1561 1562
		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);
}

1563 1564 1565 1566
static void ata_set_port_max_cmd_len(struct ata_port *ap)
{
	int i;

J
Jeff Garzik 已提交
1567 1568 1569
	if (ap->scsi_host) {
		unsigned int len = 0;

1570
		for (i = 0; i < ATA_MAX_DEVICES; i++)
J
Jeff Garzik 已提交
1571 1572 1573
			len = max(len, ap->device[i].cdb_len);

		ap->scsi_host->max_cmd_len = len;
1574 1575 1576
	}
}

1577
/**
1578 1579 1580 1581 1582
 *	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.
1583 1584
 *
 *	LOCKING:
1585 1586 1587 1588
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1589
 */
1590
int ata_dev_configure(struct ata_device *dev)
1591
{
T
Tejun Heo 已提交
1592
	struct ata_port *ap = dev->ap;
1593
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1594
	const u16 *id = dev->id;
1595
	unsigned int xfer_mask;
1596
	char revbuf[7];		/* XYZ-99\0 */
1597 1598
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1599
	int rc;
1600

1601
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1602 1603
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1604
		return 0;
1605 1606
	}

1607
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1608
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1609

1610 1611 1612 1613 1614 1615 1616 1617 1618 1619
	/* 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);

1620
	/* print device capabilities */
1621
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1622 1623 1624
		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",
1625
			       __FUNCTION__,
1626 1627
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1628

1629
	/* initialize to-be-configured parameters */
1630
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1631 1632 1633 1634 1635 1636 1637
	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
1638 1639 1640 1641
	/*
	 * common ATA, ATAPI feature tests
	 */

1642
	/* find max transfer mode; for printk only */
1643
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1644

1645 1646
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1647 1648 1649

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1650 1651
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1652 1653 1654
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1655 1656 1657 1658 1659
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1660
		dev->n_sectors = ata_id_n_sectors(id);
1661

1662
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1663
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1664 1665
				sizeof(fwrevbuf));

1666
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1667 1668 1669 1670 1671
				sizeof(modelbuf));

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

1672
		if (ata_id_has_lba(id)) {
1673
			const char *lba_desc;
1674
			char ncq_desc[20];
1675

1676 1677
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1678
			if (ata_id_has_lba48(id)) {
1679
				dev->flags |= ATA_DFLAG_LBA48;
1680
				lba_desc = "LBA48";
1681 1682 1683 1684

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1685
			}
1686

1687 1688 1689
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1690
			/* print device info to dmesg */
1691 1692 1693 1694 1695 1696 1697
			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",
1698
					(unsigned long long)dev->n_sectors,
1699 1700
					dev->multi_count, lba_desc, ncq_desc);
			}
1701
		} else {
1702 1703 1704
			/* CHS */

			/* Default translation */
1705 1706 1707
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1708

1709
			if (ata_id_current_chs_valid(id)) {
1710
				/* Current CHS translation is valid. */
1711 1712 1713
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1714 1715 1716
			}

			/* print device info to dmesg */
1717
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1718
				ata_dev_printk(dev, KERN_INFO,
1719 1720 1721
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1722
				ata_dev_printk(dev, KERN_INFO,
1723 1724 1725 1726 1727
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1728 1729
		}

1730
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1731 1732 1733
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1734
	else if (dev->class == ATA_DEV_ATAPI) {
1735 1736
		char *cdb_intr_string = "";

1737
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1738
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1739
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1740 1741
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1742
			rc = -EINVAL;
L
Linus Torvalds 已提交
1743 1744
			goto err_out_nosup;
		}
1745
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1746

1747
		if (ata_id_cdb_intr(dev->id)) {
1748
			dev->flags |= ATA_DFLAG_CDB_INTR;
1749 1750
			cdb_intr_string = ", CDB intr";
		}
1751

L
Linus Torvalds 已提交
1752
		/* print device info to dmesg */
1753
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1754 1755 1756
			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
1757 1758
	}

1759 1760 1761 1762 1763
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
	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");
		}
	}

1776
	ata_set_port_max_cmd_len(ap);
1777

1778
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1779
	if (ata_dev_knobble(dev)) {
1780
		if (ata_msg_drv(ap) && print_info)
1781 1782
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1783
		dev->udma_mask &= ATA_UDMA5;
1784 1785 1786 1787 1788 1789
		dev->max_sectors = ATA_MAX_SECTORS;
	}

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

1790 1791 1792
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1793
	return 0;
L
Linus Torvalds 已提交
1794 1795

err_out_nosup:
1796
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1797 1798
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1799
	return rc;
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804 1805
}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1806 1807 1808 1809
 *	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
1810
 *	LOCKING:
J
Jeff Garzik 已提交
1811
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1812 1813
 *
 *	RETURNS:
1814
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1815 1816
 */

1817
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1818
{
1819
	unsigned int classes[ATA_MAX_DEVICES];
1820
	int tries[ATA_MAX_DEVICES];
1821
	int i, rc;
1822
	struct ata_device *dev;
L
Linus Torvalds 已提交
1823

1824
	ata_port_probe(ap);
1825

1826 1827 1828 1829
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
1830
	/* reset and determine device classes */
1831
	ap->ops->phy_reset(ap);
1832

1833 1834
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1835

1836 1837 1838 1839 1840
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1841

1842
		dev->class = ATA_DEV_UNKNOWN;
1843
	}
L
Linus Torvalds 已提交
1844

1845
	ata_port_probe(ap);
1846

A
Alan Cox 已提交
1847 1848 1849 1850 1851 1852
	/* 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;

1853 1854 1855 1856 1857
	/* 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--) {
1858
		dev = &ap->device[i];
1859

1860 1861
		if (tries[i])
			dev->class = classes[i];
1862

1863
		if (!ata_dev_enabled(dev))
1864 1865
			continue;

1866 1867
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1868 1869
		if (rc)
			goto fail;
1870 1871 1872 1873 1874 1875 1876 1877 1878
	}

	/* 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;
1879

1880 1881 1882
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1883 1884
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1885 1886
	}

1887
	/* configure transfer mode */
1888
	rc = ata_set_mode(ap, &dev);
1889
	if (rc)
1890
		goto fail;
L
Linus Torvalds 已提交
1891

1892 1893 1894
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1895

1896 1897
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1898
	ap->ops->port_disable(ap);
1899
	return -ENODEV;
1900 1901

 fail:
1902 1903
	tries[dev->devno]--;

1904 1905
	switch (rc) {
	case -EINVAL:
1906
		/* eeek, something went very wrong, give up */
1907 1908
		tries[dev->devno] = 0;
		break;
1909 1910 1911 1912

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
1913
	case -EIO:
1914 1915 1916 1917 1918 1919 1920
		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);
		}
1921 1922
	}

1923
	if (!tries[dev->devno])
T
Tejun Heo 已提交
1924
		ata_dev_disable(dev);
1925

1926
	goto retry;
L
Linus Torvalds 已提交
1927 1928 1929
}

/**
J
Jeff Garzik 已提交
1930 1931
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1932
 *
J
Jeff Garzik 已提交
1933 1934 1935
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1936
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1937
 *	serialization.
L
Linus Torvalds 已提交
1938 1939 1940 1941
 */

void ata_port_probe(struct ata_port *ap)
{
1942
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1943 1944
}

1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
/**
 *	sata_print_link_status - Print SATA link status
 *	@ap: SATA port to printk link status about
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
static void sata_print_link_status(struct ata_port *ap)
{
1956
	u32 sstatus, scontrol, tmp;
1957

1958
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1959
		return;
1960
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1961

1962
	if (ata_port_online(ap)) {
1963
		tmp = (sstatus >> 4) & 0xf;
1964 1965 1966
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1967
	} else {
1968 1969 1970
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1971 1972 1973
	}
}

L
Linus Torvalds 已提交
1974
/**
J
Jeff Garzik 已提交
1975 1976
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1977
 *
J
Jeff Garzik 已提交
1978 1979 1980
 *	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
1981 1982
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1983
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1984 1985 1986 1987 1988 1989 1990 1991
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1992
		/* issue phy wake/reset */
1993
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1994 1995 1996
		/* 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
1997
	}
1998 1999
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2000 2001 2002 2003

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2004
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2005 2006 2007 2008
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2009 2010
	/* print link status */
	sata_print_link_status(ap);
2011

2012
	/* TODO: phy layer with polling, timeouts, etc. */
2013
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2014
		ata_port_probe(ap);
2015
	else
L
Linus Torvalds 已提交
2016 2017
		ata_port_disable(ap);

2018
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
		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
2030 2031
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2032
 *
J
Jeff Garzik 已提交
2033 2034
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2035 2036
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2037
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2038 2039 2040 2041 2042
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2043
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2044 2045 2046 2047
		return;
	ata_bus_reset(ap);
}

2048 2049 2050 2051 2052 2053 2054
/**
 *	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
 */
2055

T
Tejun Heo 已提交
2056
struct ata_device *ata_dev_pair(struct ata_device *adev)
2057
{
T
Tejun Heo 已提交
2058
	struct ata_port *ap = adev->ap;
2059
	struct ata_device *pair = &ap->device[1 - adev->devno];
2060
	if (!ata_dev_enabled(pair))
2061 2062 2063 2064
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2065
/**
J
Jeff Garzik 已提交
2066 2067
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2068
 *
J
Jeff Garzik 已提交
2069 2070 2071 2072 2073
 *	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
2074
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2075
 *	serialization.
L
Linus Torvalds 已提交
2076 2077 2078 2079 2080 2081
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2082
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2083 2084
}

2085
/**
2086
 *	sata_down_spd_limit - adjust SATA spd limit downward
2087 2088 2089 2090
 *	@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
2091
 *	using sata_set_spd().
2092 2093 2094 2095 2096 2097 2098
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2099
int sata_down_spd_limit(struct ata_port *ap)
2100
{
2101 2102
	u32 sstatus, spd, mask;
	int rc, highbit;
2103

2104 2105 2106
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2107 2108 2109 2110 2111 2112 2113

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

2114
	spd = (sstatus >> 4) & 0xf;
2115 2116 2117 2118 2119 2120 2121 2122 2123
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2124 2125
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2126 2127 2128 2129

	return 0;
}

2130
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145
{
	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;
}

/**
2146
 *	sata_set_spd_needed - is SATA spd configuration needed
2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159
 *	@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.
 */
2160
int sata_set_spd_needed(struct ata_port *ap)
2161 2162 2163
{
	u32 scontrol;

2164
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2165 2166
		return 0;

2167
	return __sata_set_spd_needed(ap, &scontrol);
2168 2169 2170
}

/**
2171
 *	sata_set_spd - set SATA spd according to spd limit
2172 2173 2174 2175 2176 2177 2178 2179 2180
 *	@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
2181
 *	changed.  Negative errno if SCR registers are inaccessible.
2182
 */
2183
int sata_set_spd(struct ata_port *ap)
2184 2185
{
	u32 scontrol;
2186
	int rc;
2187

2188 2189
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2190

2191
	if (!__sata_set_spd_needed(ap, &scontrol))
2192 2193
		return 0;

2194 2195 2196
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2197 2198 2199
	return 1;
}

A
Alan Cox 已提交
2200 2201 2202 2203 2204
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2205
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2206
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2207 2208 2209
 * 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
2210 2211 2212 2213 2214 2215 2216 2217 2218
 */

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 },

2219 2220
	{ 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
2221 2222 2223 2224 2225
	{ 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 }, */
2226

A
Alan Cox 已提交
2227 2228 2229
	{ 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 },
2230

A
Alan Cox 已提交
2231 2232 2233 2234
	{ 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 },

2235 2236
	{ 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
2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281
	{ 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
2282
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2283
			return NULL;
2284
	return t;
A
Alan Cox 已提交
2285 2286 2287 2288 2289 2290 2291 2292 2293
}

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;

	/*
2294
	 * Find the mode.
2295
	 */
A
Alan Cox 已提交
2296 2297 2298 2299

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

2300 2301
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321
	/*
	 * 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.
	 */

2322
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2323 2324

	/*
2325 2326 2327
	 * 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
2328 2329
	 */

2330
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2331 2332 2333 2334 2335
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2336
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351
	 */

	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;
}

2352 2353 2354
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2355
 *	@sel: ATA_DNXFER_* selector
2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366
 *
 *	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
 */
2367
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2368
{
2369 2370 2371 2372
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2373

2374 2375
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2376

2377 2378 2379 2380
	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);
2381

2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433
	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);
	}
2434 2435 2436 2437 2438 2439 2440

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

	return 0;
}

T
Tejun Heo 已提交
2441
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2442
{
2443
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2444 2445
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2446

2447
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2448 2449 2450
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2451
	err_mask = ata_dev_set_xfermode(dev);
2452 2453 2454 2455
	/* 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;

2456
	if (err_mask) {
2457 2458
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2459 2460
		return -EIO;
	}
L
Linus Torvalds 已提交
2461

2462
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2463
	rc = ata_dev_revalidate(dev, 0);
2464
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2465
	if (rc)
2466
		return rc;
2467

2468 2469
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2470

2471 2472
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2473
	return 0;
L
Linus Torvalds 已提交
2474 2475 2476 2477 2478
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2479
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2480
 *
2481 2482 2483
 *	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.
J
Jeff Garzik 已提交
2484
 *
L
Linus Torvalds 已提交
2485
 *	LOCKING:
J
Jeff Garzik 已提交
2486
 *	PCI/etc. bus probe sem.
2487 2488 2489
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2490
 */
2491
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2492
{
2493
	struct ata_device *dev;
2494
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2495

2496
	/* has private set_mode? */
A
Alan 已提交
2497 2498
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2499

2500 2501
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2502
		unsigned int pio_mask, dma_mask;
2503

2504 2505
		dev = &ap->device[i];

2506
		if (!ata_dev_enabled(dev))
2507 2508
			continue;

T
Tejun Heo 已提交
2509
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2510

2511 2512 2513 2514
		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);
2515

2516
		found = 1;
2517 2518
		if (dev->dma_mode)
			used_dma = 1;
2519
	}
2520
	if (!found)
2521
		goto out;
2522 2523

	/* step 2: always set host PIO timings */
2524 2525 2526 2527 2528 2529
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2530
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2531
			rc = -EINVAL;
2532
			goto out;
2533 2534 2535 2536 2537 2538 2539
		}

		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
2540

2541
	/* step 3: set host DMA timings */
2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
	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
2553 2554

	/* step 4: update devices' xfer mode */
2555
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2556
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2557

A
Alan 已提交
2558
		/* don't update suspended devices' xfer mode */
2559
		if (!ata_dev_ready(dev))
2560 2561
			continue;

T
Tejun Heo 已提交
2562
		rc = ata_dev_set_mode(dev);
2563
		if (rc)
2564
			goto out;
2565
	}
L
Linus Torvalds 已提交
2566

2567 2568
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2569
	 */
J
Jeff Garzik 已提交
2570
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2571
		ap->host->simplex_claimed = ap;
2572

2573
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2574 2575
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);
2576 2577 2578 2579
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2580 2581
}

2582 2583 2584 2585 2586 2587 2588 2589 2590 2591
/**
 *	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
2592
 *	spin_lock_irqsave(host lock)
2593 2594 2595 2596 2597 2598 2599 2600 2601
 */

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
2602 2603 2604 2605 2606 2607
/**
 *	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
2608 2609 2610
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2611 2612 2613 2614 2615
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2616
 */
2617 2618
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2619 2620 2621 2622 2623 2624 2625
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2626 2627
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2628 2629 2630 2631
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2632
	if (status != 0xff && (status & ATA_BUSY))
2633
		ata_port_printk(ap, KERN_WARNING,
2634 2635
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2636 2637

	timeout = timer_start + tmout;
2638 2639
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2640 2641 2642 2643
		msleep(50);
		status = ata_chk_status(ap);
	}

2644 2645 2646
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2647
	if (status & ATA_BUSY) {
2648
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2649 2650
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2651
		return -EBUSY;
L
Linus Torvalds 已提交
2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677
	}

	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
2678 2679
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703
		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
2704
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
2705 2706

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2707 2708 2709 2710 2711
	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
2712 2713 2714 2715 2716 2717 2718 2719

	/* 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.
2720 2721
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2722 2723 2724
	 */
	msleep(150);

2725
	/* Before we perform post reset processing we want to see if
2726 2727 2728
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2729 2730
	if (ata_check_status(ap) == 0xFF)
		return 0;
2731

L
Linus Torvalds 已提交
2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749
	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
2750
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2751
 *	Obtains host lock.
L
Linus Torvalds 已提交
2752 2753
 *
 *	SIDE EFFECTS:
2754
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2755 2756 2757 2758 2759 2760 2761
 */

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
2762
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2763

T
Tejun Heo 已提交
2764
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784

	/* 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
2785 2786
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2787 2788 2789 2790

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2791
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2792
	if ((slave_possible) && (err != 0x81))
2793
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2794 2795

	/* re-enable interrupts */
2796
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810

	/* 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
2811
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2812 2813 2814 2815 2816 2817
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2818
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2819 2820 2821 2822 2823
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842
/**
 *	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)
2843
{
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
	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;
2899 2900 2901 2902
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2903

2904
	scontrol = (scontrol & 0x0f0) | 0x300;
2905 2906 2907

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2908

2909 2910 2911 2912
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2913

2914
	return sata_phy_debounce(ap, params);
2915 2916
}

2917 2918 2919 2920 2921 2922 2923 2924
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) {
2925
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2926 2927 2928 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

		/* 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;
2961
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2962 2963
	int rc;

2964 2965 2966 2967 2968 2969 2970 2971
	/* 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);
2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996

	/* 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;
}

2997 2998 2999 3000 3001
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
3002
 *	Reset host port using ATA SRST.
3003 3004 3005 3006 3007 3008 3009
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3010
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
3011 3012 3013 3014 3015 3016 3017
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

3018
	if (ata_port_offline(ap)) {
3019 3020 3021 3022
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
	/* 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) {
3036 3037
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
3038 3039 3040 3041 3042 3043 3044 3045
		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);

3046
 out:
3047 3048 3049 3050 3051
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3052
 *	sata_port_hardreset - reset port via SATA phy reset
3053
 *	@ap: port to reset
3054
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3055 3056 3057 3058 3059 3060 3061 3062 3063
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3064
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3065
{
3066
	u32 scontrol;
3067
	int rc;
3068

3069 3070
	DPRINTK("ENTER\n");

3071
	if (sata_set_spd_needed(ap)) {
3072 3073 3074 3075 3076
		/* 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.
		 */
3077
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3078
			goto out;
3079

3080
		scontrol = (scontrol & 0x0f0) | 0x304;
3081 3082

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3083
			goto out;
3084

3085
		sata_set_spd(ap);
3086 3087 3088
	}

	/* issue phy wake/reset */
3089
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3090
		goto out;
3091

3092
	scontrol = (scontrol & 0x0f0) | 0x301;
3093 3094

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3095
		goto out;
3096

3097
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3098 3099 3100 3101
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3102
	/* bring phy back */
3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136
	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;
	}
3137 3138

	/* TODO: phy layer with polling, timeouts, etc. */
3139
	if (ata_port_offline(ap)) {
3140 3141 3142 3143 3144
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3145 3146 3147
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3148
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3149 3150
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3151 3152 3153
		return -EIO;
	}

3154 3155
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
	*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)
{
3176 3177
	u32 serror;

3178 3179 3180
	DPRINTK("ENTER\n");

	/* print link status */
3181
	sata_print_link_status(ap);
3182

3183 3184 3185 3186
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3187
	/* re-enable interrupts */
3188 3189
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3190 3191 3192 3193 3194 3195 3196

	/* 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);

3197 3198 3199 3200 3201 3202 3203
	/* 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
3204 3205
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3206 3207 3208 3209

	DPRINTK("EXIT\n");
}

3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
/**
 *	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
3226 3227
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3228 3229
{
	const u16 *old_id = dev->id;
3230 3231
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3232 3233 3234
	u64 new_n_sectors;

	if (dev->class != new_class) {
3235 3236
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3237 3238 3239
		return 0;
	}

3240 3241 3242 3243
	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]));
3244 3245 3246
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3247 3248
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3249 3250 3251 3252
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3253 3254
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3255 3256 3257 3258
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3259 3260 3261 3262
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3263 3264 3265 3266 3267 3268 3269 3270 3271
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3272
 *	@readid_flags: read ID flags
3273 3274 3275 3276 3277 3278 3279 3280 3281 3282
 *
 *	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
 */
3283
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3284
{
3285
	unsigned int class = dev->class;
3286
	u16 *id = (void *)dev->ap->sector_buf;
3287 3288
	int rc;

3289 3290 3291 3292
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3293

3294
	/* read ID data */
3295
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3296 3297 3298 3299
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3300
	if (!ata_dev_same_device(dev, class, id)) {
3301 3302 3303 3304
		rc = -ENODEV;
		goto fail;
	}

3305
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3306 3307

	/* configure device according to the new ID */
3308
	rc = ata_dev_configure(dev);
3309 3310
	if (rc == 0)
		return 0;
3311 3312

 fail:
3313
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3314 3315 3316
	return rc;
}

3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359
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 },

	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3360 3361
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3362 3363 3364 3365 3366

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3367
};
3368

3369
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3370
{
T
Tejun Heo 已提交
3371 3372
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3373
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3374

T
Tejun Heo 已提交
3375 3376
	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
3377

3378
	while (ad->model_num) {
T
Tejun Heo 已提交
3379
		if (!strcmp(ad->model_num, model_num)) {
3380 3381
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3382
			if (!strcmp(ad->model_rev, model_rev))
3383
				return ad->horkage;
3384
		}
3385
		ad++;
3386
	}
L
Linus Torvalds 已提交
3387 3388 3389
	return 0;
}

3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401
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;
}

3402 3403 3404 3405
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3406 3407 3408 3409
 *	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...
3410 3411 3412 3413
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3414
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3415
{
T
Tejun Heo 已提交
3416
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3417
	struct ata_host *host = ap->host;
3418
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3419

3420
	/* controller modes available */
3421 3422 3423 3424 3425 3426 3427 3428
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 */
	if (ap->cbl == ATA_CBL_PATA40)
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3429 3430 3431 3432 3433 3434 3435
	/* Apply drive side cable rule. Unknown or 80 pin 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 (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);

L
Linus Torvalds 已提交
3436

3437 3438 3439
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3440

3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451
	/*
	 *	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));
	}

3452 3453
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3454 3455
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3456
	}
3457

A
Alan 已提交
3458
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed != ap) {
3459 3460 3461
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3462
	}
3463

3464 3465 3466
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3467 3468
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3469 3470 3471 3472 3473 3474
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3475 3476 3477
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3478
 *	LOCKING:
J
Jeff Garzik 已提交
3479
 *	PCI/etc. bus probe sem.
3480 3481 3482
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3483 3484
 */

T
Tejun Heo 已提交
3485
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3486
{
3487
	struct ata_taskfile tf;
3488
	unsigned int err_mask;
L
Linus Torvalds 已提交
3489 3490 3491 3492

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

T
Tejun Heo 已提交
3493
	ata_tf_init(dev, &tf);
3494 3495 3496 3497 3498
	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
3499

T
Tejun Heo 已提交
3500
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3501

3502 3503
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3504 3505
}

3506 3507 3508
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3509 3510
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3511 3512
 *
 *	LOCKING:
3513 3514 3515 3516
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3517
 */
T
Tejun Heo 已提交
3518 3519
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3520
{
3521
	struct ata_taskfile tf;
3522
	unsigned int err_mask;
3523 3524 3525

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3526
		return AC_ERR_INVALID;
3527 3528 3529 3530

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

T
Tejun Heo 已提交
3531
	ata_tf_init(dev, &tf);
3532 3533 3534 3535 3536
	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 */
3537

T
Tejun Heo 已提交
3538
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3539

3540 3541
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3542 3543
}

L
Linus Torvalds 已提交
3544
/**
J
Jeff Garzik 已提交
3545 3546 3547 3548
 *	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
3549 3550
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3551
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3552
 */
3553
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3554 3555
{
	struct ata_port *ap = qc->ap;
3556
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3557
	int dir = qc->dma_dir;
3558
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3559

3560 3561
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3562 3563

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3564
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3565

J
Jeff Garzik 已提交
3566
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3567

3568 3569 3570 3571 3572 3573 3574 3575
	/* 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) {
3576
		if (qc->n_elem)
3577
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3578 3579 3580 3581 3582 3583
		/* 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);
3584
			kunmap_atomic(addr, KM_IRQ0);
3585 3586
		}
	} else {
3587
		if (qc->n_elem)
3588
			dma_unmap_single(ap->dev,
3589 3590
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3591 3592 3593 3594 3595 3596
		/* 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
3597 3598

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3599
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3600 3601 3602 3603 3604 3605
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3606 3607 3608
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3609
 *	LOCKING:
J
Jeff Garzik 已提交
3610
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3611 3612 3613 3614 3615
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3616 3617
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3618

3619
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3620
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3621 3622

	idx = 0;
3623
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656
		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
3657 3658 3659 3660
 *	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
3661
 *	LOCKING:
J
Jeff Garzik 已提交
3662
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3663
 *
L
Linus Torvalds 已提交
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int rc = 0; /* Assume ATAPI DMA is OK by default */

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

	return rc;
}
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
3681 3682
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3683
 *	LOCKING:
J
Jeff Garzik 已提交
3684
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3685 3686 3687 3688 3689 3690 3691 3692 3693
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3694 3695
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3696 3697 3698 3699 3700 3701 3702 3703 3704 3705
/**
 *	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
3706
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3707 3708
 */

L
Linus Torvalds 已提交
3709 3710 3711 3712
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3713
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3714
	qc->n_elem = 1;
3715
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3716
	qc->buf_virt = buf;
3717
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3718

3719
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3720 3721
}

J
Jeff Garzik 已提交
3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732
/**
 *	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
3733
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3734 3735
 */

L
Linus Torvalds 已提交
3736 3737 3738 3739
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3740
	qc->__sg = sg;
L
Linus Torvalds 已提交
3741
	qc->n_elem = n_elem;
3742
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3743 3744 3745
}

/**
J
Jeff Garzik 已提交
3746 3747 3748 3749
 *	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
3750 3751
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3752
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3753 3754
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3755
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3756 3757 3758 3759 3760 3761
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3762
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3763
	dma_addr_t dma_address;
3764
	int trim_sg = 0;
L
Linus Torvalds 已提交
3765

3766 3767 3768 3769 3770 3771
	/* 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;

3772
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783

		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;
3784 3785
		if (sg->length == 0)
			trim_sg = 1;
3786 3787 3788 3789 3790

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

3791 3792
	if (trim_sg) {
		qc->n_elem--;
3793 3794 3795
		goto skip_map;
	}

3796
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3797
				     sg->length, dir);
3798 3799 3800
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3801
		return -1;
3802
	}
L
Linus Torvalds 已提交
3803 3804

	sg_dma_address(sg) = dma_address;
3805
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3806

3807
skip_map:
L
Linus Torvalds 已提交
3808 3809 3810 3811 3812 3813 3814
	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
3815 3816 3817 3818
 *	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
3819 3820
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3821
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3822 3823
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3824
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3825 3826 3827 3828 3829 3830
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3831 3832
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3833
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3834

T
Tejun Heo 已提交
3835
	VPRINTK("ENTER, ata%u\n", ap->print_id);
3836
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3837

3838 3839 3840 3841 3842 3843 3844
	/* 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;

3845
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859

		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);
3860
			kunmap_atomic(addr, KM_IRQ0);
3861 3862 3863 3864 3865 3866
		}

		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;
3867 3868
		if (lsg->length == 0)
			trim_sg = 1;
3869 3870 3871 3872 3873

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

3874 3875 3876 3877 3878 3879 3880 3881 3882
	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
3883
	dir = qc->dma_dir;
3884
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3885 3886 3887
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3888
		return -1;
3889
	}
L
Linus Torvalds 已提交
3890 3891 3892

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

3893
skip_map:
L
Linus Torvalds 已提交
3894 3895 3896 3897 3898
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3899
/**
3900
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3901 3902 3903 3904 3905 3906 3907 3908
 *	@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
3909
 *	Inherited from caller.
E
Edward Falk 已提交
3910
 */
L
Linus Torvalds 已提交
3911 3912 3913 3914 3915 3916 3917 3918 3919 3920
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
3921
/**
T
Tejun Heo 已提交
3922
 *	ata_data_xfer - Transfer data by PIO
3923
 *	@adev: device to target
A
Albert Lee 已提交
3924 3925
 *	@buf: data buffer
 *	@buflen: buffer length
3926
 *	@write_data: read/write
A
Albert Lee 已提交
3927 3928 3929 3930 3931 3932
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3933 3934
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3935
{
3936
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3937
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3938

A
Albert Lee 已提交
3939
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3940
	if (write_data)
T
Tejun Heo 已提交
3941
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3942
	else
T
Tejun Heo 已提交
3943
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
3944 3945 3946 3947 3948 3949 3950 3951

	/* 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
3952
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
3953
		} else {
T
Tejun Heo 已提交
3954
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
3955 3956 3957
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3958 3959
}

3960
/**
T
Tejun Heo 已提交
3961
 *	ata_data_xfer_noirq - Transfer data by PIO
3962 3963 3964 3965 3966
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3967
 *	Transfer data from/to the device data register by PIO. Do the
3968 3969 3970 3971 3972
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3973 3974
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
3975 3976 3977
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
3978
	ata_data_xfer(adev, buf, buflen, write_data);
3979 3980 3981 3982
	local_irq_restore(flags);
}


A
Albert Lee 已提交
3983 3984 3985 3986 3987 3988 3989 3990 3991 3992
/**
 *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
 *	@qc: Command on going
 *
 *	Transfer ATA_SECT_SIZE of data from/to the ATA device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3993 3994 3995
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3996
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3997 3998 3999 4000 4001
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
4002
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
4003
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4004 4005

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4006
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4007 4008 4009 4010 4011 4012 4013

	/* 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");

4014 4015 4016
	if (PageHighMem(page)) {
		unsigned long flags;

4017
		/* FIXME: use a bounce buffer */
4018 4019
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4020

4021
		/* do the actual data transfer */
4022
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
4023

4024 4025 4026 4027
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4028
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
4029
	}
L
Linus Torvalds 已提交
4030

T
Tejun Heo 已提交
4031 4032
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
4033

T
Tejun Heo 已提交
4034
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4035 4036 4037 4038 4039
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4040 4041 4042 4043
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
4044
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
4045 4046 4047 4048 4049
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4050

4051 4052 4053 4054 4055 4056
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
4057
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4058

T
Tejun Heo 已提交
4059 4060
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
4061 4062 4063 4064 4065 4066
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082
/**
 *	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");
4083
	WARN_ON(qc->dev->cdb_len < 12);
4084

4085
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100
	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
4101 4102
}

A
Albert Lee 已提交
4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114
/**
 *	__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
4115 4116 4117
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4118
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4119 4120 4121 4122 4123
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4124
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4125
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4126 4127

next_sg:
4128
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4129
		/*
4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140
		 * 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 */
4141 4142
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4143 4144

		for (i = 0; i < words; i++)
4145
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4146

A
Albert Lee 已提交
4147
		ap->hsm_task_state = HSM_ST_LAST;
4148 4149 4150
		return;
	}

4151
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4152 4153 4154 4155 4156 4157 4158 4159

	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;

4160
	/* don't overrun current sg */
4161
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4162 4163 4164 4165

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

4166 4167
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4168 4169 4170
	if (PageHighMem(page)) {
		unsigned long flags;

4171
		/* FIXME: use bounce buffer */
4172 4173
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4174

4175
		/* do the actual data transfer */
4176
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4177

4178 4179 4180 4181
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4182
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4183
	}
L
Linus Torvalds 已提交
4184 4185 4186 4187 4188

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

4189
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4190 4191 4192 4193
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4194
	if (bytes)
L
Linus Torvalds 已提交
4195 4196 4197
		goto next_sg;
}

A
Albert Lee 已提交
4198 4199 4200 4201 4202 4203 4204 4205 4206 4207
/**
 *	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
4208 4209 4210 4211 4212 4213 4214
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;

4215 4216 4217 4218 4219 4220 4221 4222 4223 4224
	/* 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
4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235
	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
4236
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4237

L
Linus Torvalds 已提交
4238 4239 4240 4241 4242
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4243
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4244
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4245
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4246 4247 4248
}

/**
4249 4250 4251
 *	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
4252
 *
4253 4254
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4255
 */
4256 4257

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4258
{
4259 4260
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4261

4262 4263 4264 4265
	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
4266

4267 4268 4269
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4270 4271
	}

4272 4273
	return 0;
}
L
Linus Torvalds 已提交
4274

T
Tejun Heo 已提交
4275 4276 4277 4278 4279 4280 4281 4282
/**
 *	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
4283
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4284 4285 4286 4287 4288 4289 4290 4291 4292
 *	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) {
4293
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4294

J
Jeff Garzik 已提交
4295 4296
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4297 4298 4299 4300
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4301
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4302 4303 4304 4305 4306
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4307
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4308 4309 4310 4311 4312 4313 4314 4315
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4316
			spin_lock_irqsave(ap->lock, flags);
4317
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4318
			ata_qc_complete(qc);
4319
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4320 4321 4322
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4323

4324
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4325 4326
}

4327 4328 4329 4330 4331 4332 4333 4334 4335 4336
/**
 *	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.
 */
4337 4338
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4339
{
4340 4341 4342
	unsigned long flags = 0;
	int poll_next;

4343 4344
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4345 4346 4347 4348
	/* 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).
	 */
4349
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4350

4351
fsm_start:
4352
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4353
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4354

4355 4356
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4357 4358 4359 4360 4361 4362 4363 4364
		/* 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);

4365
		/* check device status */
4366 4367 4368 4369 4370 4371 4372 4373 4374
		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
4375
			ap->hsm_task_state = HSM_ST_ERR;
4376
			goto fsm_start;
L
Linus Torvalds 已提交
4377 4378
		}

4379 4380
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4381 4382 4383
		 * 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.
4384 4385
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4386 4387
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4388
			qc->err_mask |= AC_ERR_HSM;
4389 4390
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4391
		}
L
Linus Torvalds 已提交
4392

4393 4394 4395 4396 4397 4398
		/* 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)
4399
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4400

4401 4402 4403 4404
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4405

4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417
			/* 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)
4418
			spin_unlock_irqrestore(ap->lock, flags);
4419 4420 4421 4422

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4423
		break;
4424

4425 4426 4427 4428 4429
	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) {
4430 4431 4432
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4433 4434 4435
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4436

4437 4438
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4439 4440 4441
			 * 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.
4442 4443
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4444 4445 4446
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4447
				qc->err_mask |= AC_ERR_HSM;
4448 4449
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4450
			}
L
Linus Torvalds 已提交
4451

4452
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4453

4454 4455 4456
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4457

4458 4459 4460 4461
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4462 4463 4464 4465
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4466 4467 4468 4469 4470 4471
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4472

4473 4474 4475
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4476

4477 4478 4479 4480 4481 4482 4483 4484 4485
			/* 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.
4486 4487 4488 4489
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4490 4491 4492 4493 4494 4495 4496

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

4497 4498 4499
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4500 4501 4502 4503 4504 4505
				/* 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;
4506 4507
			}

4508 4509 4510 4511 4512 4513
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4514
				status = ata_wait_idle(ap);
4515 4516 4517 4518 4519
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4520
		poll_next = 1;
L
Linus Torvalds 已提交
4521 4522
		break;

A
Albert Lee 已提交
4523
	case HSM_ST_LAST:
4524 4525
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4526 4527 4528 4529 4530
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4531
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4532
			ap->print_id, qc->dev->devno, status);
4533

4534 4535
		WARN_ON(qc->err_mask);

4536
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4537

4538
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4539
		ata_hsm_qc_complete(qc, in_wq);
4540 4541

		poll_next = 0;
L
Linus Torvalds 已提交
4542 4543
		break;

A
Albert Lee 已提交
4544
	case HSM_ST_ERR:
4545 4546 4547 4548 4549 4550
		/* 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;
4551

4552
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4553
		ata_hsm_qc_complete(qc, in_wq);
4554 4555

		poll_next = 0;
4556 4557
		break;
	default:
4558
		poll_next = 0;
4559
		BUG();
L
Linus Torvalds 已提交
4560 4561
	}

4562
	return poll_next;
L
Linus Torvalds 已提交
4563 4564
}

4565
static void ata_pio_task(struct work_struct *work)
4566
{
4567 4568 4569
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4570
	u8 status;
4571
	int poll_next;
4572

J
Jeff Garzik 已提交
4573
fsm_start:
4574
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4575

4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587
	/*
	 * 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) {
4588
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4589 4590
			return;
		}
4591 4592
	}

4593 4594
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4595

4596 4597 4598 4599
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4600
		goto fsm_start;
4601 4602
}

L
Linus Torvalds 已提交
4603 4604 4605 4606 4607 4608
/**
 *	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
4609
 *	None.
L
Linus Torvalds 已提交
4610 4611 4612 4613 4614 4615 4616
 */

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

4617
	/* no command while frozen */
4618
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4619 4620
		return NULL;

4621 4622
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4623
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4624
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638
			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
4639
 *	None.
L
Linus Torvalds 已提交
4640 4641
 */

T
Tejun Heo 已提交
4642
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4643
{
T
Tejun Heo 已提交
4644
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4645 4646 4647 4648 4649 4650 4651 4652
	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
4653
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666
	}

	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
4667
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4668 4669 4670
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4671 4672 4673
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4674
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4675

4676 4677 4678 4679
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4680
		clear_bit(tag, &ap->qc_allocated);
4681
	}
L
Linus Torvalds 已提交
4682 4683
}

4684
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4685
{
4686 4687
	struct ata_port *ap = qc->ap;

4688 4689
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4690 4691 4692 4693

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

4694
	/* command should be marked inactive atomically with qc completion */
4695 4696 4697 4698
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4699

4700 4701 4702 4703 4704
	/* 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;
4705
	ap->qc_active &= ~(1 << qc->tag);
4706

L
Linus Torvalds 已提交
4707
	/* call completion callback */
4708
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4709 4710
}

4711 4712 4713 4714 4715 4716 4717 4718
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

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

4719 4720 4721 4722 4723 4724 4725 4726 4727
/**
 *	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
4728
 *	spin_lock_irqsave(host lock)
4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747
 */
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) {
4748
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4749 4750 4751 4752 4753 4754 4755

		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 */
4756
				fill_result_tf(qc);
4757 4758 4759 4760 4761 4762 4763
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4764
			fill_result_tf(qc);
4765 4766 4767 4768 4769 4770 4771 4772

		__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)
4773
			fill_result_tf(qc);
4774 4775 4776 4777 4778

		__ata_qc_complete(qc);
	}
}

4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790
/**
 *	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
4791
 *	spin_lock_irqsave(host lock)
4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827
 *
 *	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
4828 4829 4830 4831 4832
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4833
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861
	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
4862
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4863
 */
4864
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4865 4866 4867
{
	struct ata_port *ap = qc->ap;

4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881
	/* 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;
	}

4882
	qc->flags |= ATA_QCFLAG_ACTIVE;
4883
	ap->qc_active |= 1 << qc->tag;
4884

L
Linus Torvalds 已提交
4885 4886 4887
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4888
				goto sg_err;
L
Linus Torvalds 已提交
4889 4890
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4891
				goto sg_err;
L
Linus Torvalds 已提交
4892 4893 4894 4895 4896 4897 4898
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4899 4900 4901 4902
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4903

4904 4905
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4906 4907 4908
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919
}

/**
 *	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
4920 4921
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4922
 *	LOCKING:
J
Jeff Garzik 已提交
4923
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4924 4925
 *
 *	RETURNS:
4926
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4927 4928
 */

4929
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4930 4931 4932
{
	struct ata_port *ap = qc->ap;

4933 4934 4935 4936 4937 4938
	/* 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:
4939
		case ATA_PROT_NODATA:
4940 4941 4942 4943 4944 4945
		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)
4946
				/* see ata_dma_blacklisted() */
4947 4948 4949 4950 4951 4952 4953
				BUG();
			break;
		default:
			break;
		}
	}

4954 4955 4956 4957 4958 4959 4960 4961
	/* 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;

4962
	/* select the device */
L
Linus Torvalds 已提交
4963 4964
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4965
	/* start the command */
L
Linus Torvalds 已提交
4966 4967
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4968 4969 4970
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4971
		ata_tf_to_host(ap, &qc->tf);
4972 4973 4974
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
4975
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4976

L
Linus Torvalds 已提交
4977 4978 4979
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
4980
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4981

L
Linus Torvalds 已提交
4982 4983 4984
		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 */
4985
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4986 4987
		break;

4988 4989 4990
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
4991

J
Jeff Garzik 已提交
4992
		ata_tf_to_host(ap, &qc->tf);
4993

4994 4995 4996
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
4997
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4998 4999

			/* always send first data block using
5000
			 * the ata_pio_task() codepath.
5001
			 */
5002
		} else {
5003 5004 5005 5006
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5007
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5008 5009 5010 5011

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5012 5013
		}

L
Linus Torvalds 已提交
5014 5015 5016 5017
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5018 5019 5020
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5021
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5022

5023 5024 5025 5026 5027
		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))
5028
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5029 5030 5031
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5032
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5033

L
Linus Torvalds 已提交
5034 5035
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5036 5037 5038 5039
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5040
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5041 5042 5043 5044
		break;

	default:
		WARN_ON(1);
5045
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060
	}

	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
5061
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5062 5063 5064 5065 5066 5067 5068 5069
 *
 *	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)
{
5070
	struct ata_eh_info *ehi = &ap->eh_info;
5071
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5072

5073
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5074
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5075

5076 5077 5078
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5079 5080 5081
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5082

5083 5084 5085 5086 5087
		/* 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
5088 5089
			goto idle_irq;
		break;
5090 5091 5092 5093 5094
	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
5095 5096
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5097 5098 5099 5100 5101 5102 5103

			/* 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);
5104 5105 5106 5107 5108 5109

			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;
			}
5110 5111 5112 5113
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5114 5115 5116 5117
	default:
		goto idle_irq;
	}

5118 5119 5120 5121
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5122

5123 5124 5125 5126
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5127

5128 5129
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5130

5131
	ata_hsm_move(ap, qc, status, 0);
5132 5133 5134 5135 5136

	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
5137 5138 5139 5140 5141 5142 5143
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5144
		ap->ops->irq_ack(ap, 0); /* debug trap */
5145
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5146
		return 1;
L
Linus Torvalds 已提交
5147 5148 5149 5150 5151 5152 5153
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5154
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5155
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5156
 *
J
Jeff Garzik 已提交
5157 5158 5159
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5160
 *	LOCKING:
J
Jeff Garzik 已提交
5161
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5162 5163
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5164
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5165 5166
 */

5167
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5168
{
J
Jeff Garzik 已提交
5169
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5170 5171 5172 5173 5174
	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
5175
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5176

J
Jeff Garzik 已提交
5177
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5178 5179
		struct ata_port *ap;

J
Jeff Garzik 已提交
5180
		ap = host->ports[i];
5181
		if (ap &&
J
Jeff Garzik 已提交
5182
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5183 5184 5185
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5186
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5187
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5188 5189 5190 5191
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5192
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5193 5194 5195 5196

	return IRQ_RETVAL(handled);
}

5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333
/**
 *	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
5334

5335
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5336
{
5337
	unsigned int err_mask;
J
Jens Axboe 已提交
5338 5339 5340 5341 5342
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5343
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5344 5345 5346 5347
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5348 5349 5350 5351 5352 5353 5354
	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
5355 5356
}

J
Jeff Garzik 已提交
5357 5358 5359
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5360 5361 5362 5363
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5364 5365
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
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

		/* 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
5405 5406
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5407 5408
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5409
 *	Suspend @host.  Actual operation is performed by EH.  This
5410 5411 5412 5413 5414 5415 5416 5417 5418
 *	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
5419
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5420 5421 5422
{
	int i, j, rc;

J
Jeff Garzik 已提交
5423
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5424 5425 5426 5427 5428 5429 5430
	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
5431 5432
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446

		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
5447
	host->dev->power.power_state = mesg;
5448 5449 5450
	return 0;

 fail:
J
Jeff Garzik 已提交
5451
	ata_host_resume(host);
5452 5453 5454 5455
	return rc;
}

/**
J
Jeff Garzik 已提交
5456 5457
 *	ata_host_resume - resume host
 *	@host: host to resume
5458
 *
J
Jeff Garzik 已提交
5459
 *	Resume @host.  Actual operation is performed by EH.  This
5460 5461 5462 5463 5464 5465
 *	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
5466
void ata_host_resume(struct ata_host *host)
5467
{
J
Jeff Garzik 已提交
5468 5469 5470
	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;
5471 5472
}

5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484
/**
 *	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.
 */
5485
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5486
{
5487
	struct device *dev = ap->dev;
5488
	int rc;
L
Linus Torvalds 已提交
5489

5490 5491
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5492 5493 5494
	if (!ap->prd)
		return -ENOMEM;

5495
	rc = ata_pad_alloc(ap, dev);
5496
	if (rc)
5497
		return rc;
L
Linus Torvalds 已提交
5498

5499 5500
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5501 5502 5503
	return 0;
}

5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515
/**
 *	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;
5516 5517
	unsigned long flags;

5518 5519 5520
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5521 5522
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5523
	 * host lock.
5524
	 */
5525
	spin_lock_irqsave(ap->lock, flags);
5526
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5527
	spin_unlock_irqrestore(ap->lock, flags);
5528

5529 5530
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5531 5532 5533 5534 5535
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5536
/**
B
Brian King 已提交
5537
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5538
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5539
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5540 5541 5542
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5543
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5544
 *
L
Linus Torvalds 已提交
5545
 *	LOCKING:
J
Jeff Garzik 已提交
5546
 *	Inherited from caller.
L
Linus Torvalds 已提交
5547
 */
J
Jeff Garzik 已提交
5548
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5549
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5550 5551 5552
{
	unsigned int i;

J
Jeff Garzik 已提交
5553
	ap->lock = &host->lock;
5554
	ap->flags = ATA_FLAG_DISABLED;
T
Tejun Heo 已提交
5555
	ap->print_id = ata_print_id++;
L
Linus Torvalds 已提交
5556
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5557
	ap->host = host;
5558
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5559
	ap->port_no = port_no;
5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572
	if (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;
	}
5573
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5574 5575
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5576 5577 5578 5579 5580 5581

#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
5582
#else
5583
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5584
#endif
L
Linus Torvalds 已提交
5585

5586 5587 5588
	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);
5589
	INIT_LIST_HEAD(&ap->eh_done_q);
5590
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5591

5592 5593 5594 5595 5596
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5597 5598
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5599
		dev->ap = ap;
5600
		dev->devno = i;
5601
		ata_dev_init(dev);
5602
	}
L
Linus Torvalds 已提交
5603 5604 5605 5606 5607 5608 5609 5610 5611

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

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

B
Brian King 已提交
5612
/**
5613 5614 5615
 *	ata_port_init_shost - Initialize SCSI host associated with ATA port
 *	@ap: ATA port to initialize SCSI host for
 *	@shost: SCSI host associated with @ap
B
Brian King 已提交
5616
 *
5617
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5618 5619 5620 5621
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5622
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5623
{
J
Jeff Garzik 已提交
5624
	ap->scsi_host = shost;
B
Brian King 已提交
5625

T
Tejun Heo 已提交
5626
	shost->unique_id = ap->print_id;
5627 5628 5629 5630
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5631 5632
}

L
Linus Torvalds 已提交
5633
/**
5634
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5635
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5636
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5637 5638
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5639 5640
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5641
 *	LOCKING:
J
Jeff Garzik 已提交
5642
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5643 5644
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5645
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5646
 */
5647
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5648
				      struct ata_host *host,
L
Linus Torvalds 已提交
5649 5650
				      unsigned int port_no)
{
5651
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5652 5653 5654
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5655

5656
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5657
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5658 5659 5660 5661 5662
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5663 5664
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5665 5666
		return NULL;

5667
	shost->transportt = &ata_scsi_transport_template;
5668

5669
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5670

J
Jeff Garzik 已提交
5671
	ata_port_init(ap, host, ent, port_no);
5672
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5673 5674 5675 5676

	return ap;
}

5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695
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];

		if (!ap)
			continue;

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

		scsi_host_put(ap->scsi_host);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
5696 5697

	dev_set_drvdata(gendev, NULL);
5698 5699
}

5700
/**
J
Jeff Garzik 已提交
5701 5702 5703 5704 5705
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5706 5707 5708 5709 5710 5711
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5712 5713
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5714
{
J
Jeff Garzik 已提交
5715 5716 5717 5718
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5719 5720
}

L
Linus Torvalds 已提交
5721
/**
J
Jeff Garzik 已提交
5722 5723 5724 5725 5726 5727 5728 5729 5730 5731
 *	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
5732 5733
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5734
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5735 5736
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5737
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5738
 */
J
Jeff Garzik 已提交
5739
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5740
{
5741
	unsigned int i;
L
Linus Torvalds 已提交
5742
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5743
	struct ata_host *host;
5744
	int rc;
L
Linus Torvalds 已提交
5745 5746

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5747

5748 5749 5750 5751
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5752 5753 5754 5755

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

L
Linus Torvalds 已提交
5756
	/* alloc a container for our list of ATA ports (buses) */
5757 5758
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5759
	if (!host)
5760 5761 5762
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5763

J
Jeff Garzik 已提交
5764 5765 5766 5767
	ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
	host->n_ports = ent->n_ports;
	host->irq = ent->irq;
	host->irq2 = ent->irq2;
T
Tejun Heo 已提交
5768
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5769
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5770 5771

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5772
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5773 5774
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5775
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5776

J
Jeff Garzik 已提交
5777
		ap = ata_port_add(ent, host, i);
5778
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5779 5780 5781
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5782 5783 5784 5785 5786 5787 5788 5789 5790 5791
		/* dummy? */
		if (ent->dummy_port_mask & (1 << i)) {
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
			ap->ops = &ata_dummy_port_ops;
			continue;
		}

		/* start port */
		rc = ap->ops->port_start(ap);
		if (rc) {
J
Jeff Garzik 已提交
5792 5793
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5794 5795 5796
			goto err_out;
		}

5797 5798 5799 5800
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5801 5802 5803 5804 5805
		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
				(ap->pio_mask << ATA_SHIFT_PIO);

		/* print per-port info to dmesg */
T
Tejun Heo 已提交
5806 5807
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5808 5809 5810 5811 5812
				ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
				ata_mode_string(xfer_mode_mask),
				ap->ioaddr.cmd_addr,
				ap->ioaddr.ctl_addr,
				ap->ioaddr.bmdma_addr,
5813
				irq_line);
L
Linus Torvalds 已提交
5814

5815 5816
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5817 5818
	}

5819
	/* obtain irq, that may be shared between channels */
5820 5821
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5822 5823 5824
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5825
		goto err_out;
5826
	}
L
Linus Torvalds 已提交
5827

5828 5829 5830 5831 5832 5833
	/* 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);

5834 5835 5836
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5837 5838 5839
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5840
			goto err_out;
5841 5842 5843
		}
	}

5844
	/* resource acquisition complete */
T
Tejun Heo 已提交
5845
	devres_remove_group(dev, ata_device_add);
5846

L
Linus Torvalds 已提交
5847 5848
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5849 5850
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5851
		u32 scontrol;
L
Linus Torvalds 已提交
5852 5853
		int rc;

5854 5855 5856 5857 5858 5859 5860
		/* 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;

J
Jeff Garzik 已提交
5861
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5862
		if (rc) {
5863
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5864 5865 5866 5867 5868 5869
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5870

5871
		if (ap->ops->error_handler) {
5872
			struct ata_eh_info *ehi = &ap->eh_info;
5873 5874 5875 5876 5877
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5878
			spin_lock_irqsave(ap->lock, flags);
5879

5880 5881 5882
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5883

5884
			ap->pflags |= ATA_PFLAG_LOADING;
5885 5886
			ata_port_schedule_eh(ap);

5887
			spin_unlock_irqrestore(ap->lock, flags);
5888 5889 5890 5891

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
T
Tejun Heo 已提交
5892
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5893
			rc = ata_bus_probe(ap);
T
Tejun Heo 已提交
5894
			DPRINTK("ata%u: bus probe end\n", ap->print_id);
5895 5896 5897 5898 5899 5900 5901 5902 5903 5904

			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.
				 */
			}
		}
L
Linus Torvalds 已提交
5905 5906 5907
	}

	/* probes are done, now scan each port's disk(s) */
5908
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5909 5910
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5911

J
Jeff Garzik 已提交
5912
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5913 5914 5915 5916 5917
	}

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

5918 5919 5920
 err_out:
	devres_release_group(dev, ata_device_add);
	VPRINTK("EXIT, returning %d\n", rc);
L
Linus Torvalds 已提交
5921 5922 5923
	return 0;
}

5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940
/**
 *	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)
5941
		goto skip_eh;
5942 5943

	/* tell EH we're leaving & flush EH */
5944
	spin_lock_irqsave(ap->lock, flags);
5945
	ap->pflags |= ATA_PFLAG_UNLOADING;
5946
	spin_unlock_irqrestore(ap->lock, flags);
5947 5948 5949 5950 5951 5952

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5953
	spin_lock_irqsave(ap->lock, flags);
5954 5955 5956 5957

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

5958
	spin_unlock_irqrestore(ap->lock, flags);
5959 5960 5961 5962 5963

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5964
	spin_lock_irqsave(ap->lock, flags);
5965
	ata_port_freeze(ap);	/* won't be thawed */
5966
	spin_unlock_irqrestore(ap->lock, flags);
5967 5968 5969 5970 5971 5972 5973 5974 5975 5976

	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);

5977
 skip_eh:
5978
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5979
	scsi_remove_host(ap->scsi_host);
5980 5981
}

T
Tejun Heo 已提交
5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998
/**
 *	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]);
}

5999 6000 6001 6002 6003
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

6004
	probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
6005 6006 6007 6008 6009 6010 6011 6012 6013 6014
	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
6015
	probe_ent->port_flags = port->flags;
6016 6017 6018 6019
	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;
6020
	probe_ent->private_data = port->private_data;
6021 6022 6023 6024

	return probe_ent;
}

L
Linus Torvalds 已提交
6025 6026 6027
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6028 6029 6030 6031 6032 6033 6034
 *
 *	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
6035
 */
E
Edward Falk 已提交
6036

L
Linus Torvalds 已提交
6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050
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
6051

6052 6053
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6054 6055 6056 6057
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6058 6059 6060
 *	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
6061 6062 6063 6064
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6065
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6066 6067
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6068
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6069

T
Tejun Heo 已提交
6070
	ata_host_detach(host);
L
Linus Torvalds 已提交
6071 6072 6073
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6074
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105
{
	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
6106

6107
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6108 6109
{
	pci_save_state(pdev);
6110
	pci_disable_device(pdev);
6111

6112
	if (mesg.event == PM_EVENT_SUSPEND)
6113
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6114 6115
}

6116
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6117
{
6118 6119
	int rc;

J
Jens Axboe 已提交
6120 6121
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6122

T
Tejun Heo 已提交
6123
	rc = pcim_enable_device(pdev);
6124 6125 6126 6127 6128 6129
	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
6130
	pci_set_master(pdev);
6131
	return 0;
6132 6133
}

6134
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6135
{
J
Jeff Garzik 已提交
6136
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6137 6138
	int rc = 0;

J
Jeff Garzik 已提交
6139
	rc = ata_host_suspend(host, mesg);
6140 6141 6142
	if (rc)
		return rc;

6143
	ata_pci_device_do_suspend(pdev, mesg);
6144 6145 6146 6147 6148 6149

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6150
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6151
	int rc;
6152

6153 6154 6155 6156
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6157
}
L
Linus Torvalds 已提交
6158 6159 6160 6161 6162
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6163
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6164 6165 6166 6167
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6168 6169 6170 6171 6172 6173
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6174 6175 6176 6177 6178 6179 6180
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6181
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6182 6183
}

6184
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6185 6186
module_exit(ata_exit);

6187
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6188
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207

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;
}

6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253
/**
 *	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
6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286
/*
 * 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,
};

L
Linus Torvalds 已提交
6287 6288 6289 6290 6291 6292 6293
/*
 * 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.
 */

6294 6295 6296
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
T
Tejun Heo 已提交
6297
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6298 6299
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6300
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6301
EXPORT_SYMBOL_GPL(ata_device_add);
T
Tejun Heo 已提交
6302
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6303 6304
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6305
EXPORT_SYMBOL_GPL(ata_hsm_move);
6306
EXPORT_SYMBOL_GPL(ata_qc_complete);
6307
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319
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);
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);
T
Tejun Heo 已提交
6320 6321
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6322
EXPORT_SYMBOL_GPL(ata_qc_prep);
6323
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6324 6325 6326 6327 6328
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);
6329 6330 6331 6332 6333
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);
L
Linus Torvalds 已提交
6334
EXPORT_SYMBOL_GPL(ata_port_probe);
6335
EXPORT_SYMBOL_GPL(ata_dev_disable);
6336
EXPORT_SYMBOL_GPL(sata_set_spd);
6337 6338
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6339 6340 6341
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6342
EXPORT_SYMBOL_GPL(ata_std_prereset);
6343
EXPORT_SYMBOL_GPL(ata_std_softreset);
6344
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6345 6346
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6347 6348
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6349
EXPORT_SYMBOL_GPL(ata_port_disable);
6350
EXPORT_SYMBOL_GPL(ata_ratelimit);
6351
EXPORT_SYMBOL_GPL(ata_wait_register);
6352
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6353
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6354 6355 6356
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6357
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6358
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6359
EXPORT_SYMBOL_GPL(ata_host_intr);
6360 6361 6362 6363 6364 6365
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);
J
Jeff Garzik 已提交
6366 6367
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6368 6369
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6370
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6371
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6372 6373
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6374
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6375 6376 6377
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6378 6379 6380 6381 6382
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6383 6384
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6385 6386
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
Alan Cox 已提交
6387 6388
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6389
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6390 6391 6392

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6393 6394

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6395 6396
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6397 6398 6399
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6400 6401
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6402
EXPORT_SYMBOL_GPL(ata_do_eh);
6403 6404 6405 6406
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
6407
EXPORT_SYMBOL_GPL(ata_dev_try_classify);