libata-core.c 157.5 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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/* 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_unique_id = 1;
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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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;

	if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
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			   ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ &&
	    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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		dev->class++;
	}
}

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

/**
 *	ata_dev_classify - determine device type based on ATA-spec signature
 *	@tf: ATA taskfile register set for device to be identified
 *
 *	Determine from taskfile register contents whether a device is
 *	ATA or ATAPI, as per "Signature and persistence" section
 *	of ATA/PI spec (volume 1, sect 5.14).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
 *	the event of failure.
 */

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

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

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

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

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

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

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

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

	ap->ops->tf_read(ap, &tf);
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	err = tf.feature;
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	if (r_err)
		*r_err = err;
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	/* see if device passed diags: if master then continue and warn later */
	if (err == 0 && device == 0)
		/* diagnostic fail : do nothing _YET_ */
		ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
	else if (err == 1)
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		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
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		return ATA_DEV_NONE;
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	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
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	if (class == ATA_DEV_UNKNOWN)
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		return ATA_DEV_NONE;
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	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
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		return ATA_DEV_NONE;
	return class;
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}

/**
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 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an even number.
 *
 *	The strings in the IDENTIFY DEVICE page are broken up into
 *	16-bit chunks.  Run through the string, and output each
 *	8-bit chunk linearly, regardless of platform.
 *
 *	LOCKING:
 *	caller.
 */

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

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

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

		ofs++;
		len -= 2;
	}
}

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

	WARN_ON(!(len & 1));

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	ata_id_string(id, s, ofs, len - 1);
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	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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

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

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

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

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

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

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
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	if (ata_msg_probe(ap))
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		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, ata%u: "
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				"device %u, wait %u\n", ap->id, 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
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 *	@id: IDENTIFY DEVICE page to dump
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 *
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 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

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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",
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		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.
		 */
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		u8 mode = id[ATA_ID_OLD_PIO_MODES] & 0xFF;
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
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		/* 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;
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	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);
	}

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	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
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	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
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 *	@fn: workqueue function to be scheduled
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 *	@data: data for @fn to use
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 *	@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.
 */
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void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
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			 unsigned long delay)
{
	int rc;

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	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
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		return;

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	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
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	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");

1132
	spin_lock_irqsave(ap->lock, flags);
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	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
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	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)) {
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		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);
	}

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

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void ata_qc_complete_internal(struct ata_queued_cmd *qc)
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{
1161
	struct completion *waiting = qc->private_data;
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	complete(waiting);
}

/**
1167
 *	ata_exec_internal_sg - execute libata internal command
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 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
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 *	@cdb: CDB for packet command
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 *	@dma_dir: Data tranfer direction of the command
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 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
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 *
 *	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.
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 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
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 */
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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)
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{
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	struct ata_port *ap = dev->ap;
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	u8 command = tf->command;
	struct ata_queued_cmd *qc;
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	unsigned int tag, preempted_tag;
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	u32 preempted_sactive, preempted_qc_active;
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	DECLARE_COMPLETION_ONSTACK(wait);
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	unsigned long flags;
1199
	unsigned int err_mask;
1200
	int rc;
1201

1202
	spin_lock_irqsave(ap->lock, flags);
1203

1204
	/* no internal command while frozen */
1205
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1206
		spin_unlock_irqrestore(ap->lock, flags);
1207 1208 1209
		return AC_ERR_SYSTEM;
	}

1210
	/* initialize internal qc */
1211

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221
	/* 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;

1222
	if (test_and_set_bit(tag, &ap->qc_allocated))
1223
		BUG();
1224
	qc = __ata_qc_from_tag(ap, tag);
1225 1226 1227 1228 1229 1230 1231 1232

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

	preempted_tag = ap->active_tag;
1233 1234
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1235
	ap->active_tag = ATA_TAG_POISON;
1236 1237
	ap->sactive = 0;
	ap->qc_active = 0;
1238 1239

	/* prepare & issue qc */
1240
	qc->tf = *tf;
1241 1242
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1243
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1244 1245
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1246 1247 1248 1249 1250 1251
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1252 1253 1254
		qc->nsect = buflen / ATA_SECT_SIZE;
	}

1255
	qc->private_data = &wait;
1256 1257
	qc->complete_fn = ata_qc_complete_internal;

1258
	ata_qc_issue(qc);
1259

1260
	spin_unlock_irqrestore(ap->lock, flags);
1261

A
Andrew Morton 已提交
1262
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1263 1264

	ata_port_flush_task(ap);
1265

1266
	if (!rc) {
1267
		spin_lock_irqsave(ap->lock, flags);
1268 1269 1270

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1271 1272
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1273
		 */
1274
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1275 1276 1277 1278 1279 1280
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1281

1282 1283
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1284
					"qc timeout (cmd 0x%x)\n", command);
1285 1286
		}

1287
		spin_unlock_irqrestore(ap->lock, flags);
1288 1289
	}

1290 1291 1292 1293 1294
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

	if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
1295
		if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1296
			ata_dev_printk(dev, KERN_WARNING,
1297
				"zero err_mask for failed "
T
Tejun Heo 已提交
1298
				"internal command, assuming AC_ERR_OTHER\n");
1299 1300 1301
		qc->err_mask |= AC_ERR_OTHER;
	}

1302
	/* finish up */
1303
	spin_lock_irqsave(ap->lock, flags);
1304

1305
	*tf = qc->result_tf;
1306 1307 1308
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1309
	ap->active_tag = preempted_tag;
1310 1311
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1312

1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
	/* 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.
	 */
1324
	if (ap->flags & ATA_FLAG_DISABLED) {
1325 1326 1327 1328
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1329
	spin_unlock_irqrestore(ap->lock, flags);
1330

1331
	return err_mask;
1332 1333
}

1334
/**
1335
 *	ata_exec_internal - execute libata internal command
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
 *	@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)
{
1356 1357
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1358

1359 1360 1361 1362 1363 1364
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1365

1366
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1367 1368
}

1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381
/**
 *	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
1382
 */
1383
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1384 1385 1386 1387 1388 1389 1390 1391 1392
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1393
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1394 1395
}

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412
/**
 *	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;
1413

1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
	/* 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
1429
/**
1430 1431 1432
 *	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)
1433
 *	@flags: ATA_READID_* flags
1434
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1435
 *
1436 1437
 *	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
1438 1439
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1440 1441
 *
 *	LOCKING:
1442 1443 1444 1445
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1446
 */
1447
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1448
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1449
{
T
Tejun Heo 已提交
1450
	struct ata_port *ap = dev->ap;
1451
	unsigned int class = *p_class;
1452
	struct ata_taskfile tf;
1453 1454 1455
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1456

1457
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1458 1459
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1460

1461
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1462

1463
 retry:
T
Tejun Heo 已提交
1464
	ata_tf_init(dev, &tf);
1465

1466 1467
	switch (class) {
	case ATA_DEV_ATA:
1468
		tf.command = ATA_CMD_ID_ATA;
1469 1470
		break;
	case ATA_DEV_ATAPI:
1471
		tf.command = ATA_CMD_ID_ATAPI;
1472 1473 1474 1475 1476
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1477 1478
	}

1479
	tf.protocol = ATA_PROT_PIO;
1480
	tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
L
Linus Torvalds 已提交
1481

T
Tejun Heo 已提交
1482
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1483
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1484
	if (err_mask) {
1485
		if (err_mask & AC_ERR_NODEV_HINT) {
1486 1487 1488 1489 1490
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
				ap->id, dev->devno);
			return -ENOENT;
		}

1491 1492
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1493 1494 1495
		goto err_out;
	}

1496
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1497

1498
	/* sanity check */
1499 1500 1501 1502 1503 1504 1505 1506 1507
	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;
1508 1509
	}

1510
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1511 1512 1513 1514 1515 1516 1517 1518 1519
		/*
		 * 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
1520
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1521 1522 1523 1524 1525 1526 1527 1528 1529
			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.
			 */
1530
			flags &= ~ATA_READID_POSTRESET;
1531 1532 1533 1534 1535
			goto retry;
		}
	}

	*p_class = class;
1536

1537 1538 1539
	return 0;

 err_out:
T
Tejun Heo 已提交
1540
	if (ata_msg_warn(ap))
1541
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1542
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1543 1544 1545
	return rc;
}

T
Tejun Heo 已提交
1546
static inline u8 ata_dev_knobble(struct ata_device *dev)
1547
{
T
Tejun Heo 已提交
1548
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1549 1550
}

1551 1552 1553 1554 1555 1556 1557 1558 1559 1560
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;
	}
1561 1562 1563 1564
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1565
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1566
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1567 1568 1569 1570 1571 1572 1573 1574 1575
		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);
}

1576 1577 1578 1579
static void ata_set_port_max_cmd_len(struct ata_port *ap)
{
	int i;

J
Jeff Garzik 已提交
1580 1581 1582
	if (ap->scsi_host) {
		unsigned int len = 0;

1583
		for (i = 0; i < ATA_MAX_DEVICES; i++)
J
Jeff Garzik 已提交
1584 1585 1586
			len = max(len, ap->device[i].cdb_len);

		ap->scsi_host->max_cmd_len = len;
1587 1588 1589
	}
}

1590
/**
1591 1592 1593 1594 1595
 *	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.
1596 1597
 *
 *	LOCKING:
1598 1599 1600 1601
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1602
 */
1603
int ata_dev_configure(struct ata_device *dev)
1604
{
T
Tejun Heo 已提交
1605
	struct ata_port *ap = dev->ap;
1606
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1607
	const u16 *id = dev->id;
1608
	unsigned int xfer_mask;
1609
	char revbuf[7];		/* XYZ-99\0 */
1610
	int rc;
1611

1612
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1613 1614 1615
		ata_dev_printk(dev, KERN_INFO,
			       "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
			       __FUNCTION__, ap->id, dev->devno);
1616
		return 0;
1617 1618
	}

1619
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1620 1621
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1622

1623
	/* print device capabilities */
1624
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1625 1626 1627
		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",
1628
			       __FUNCTION__,
1629 1630
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1631

1632
	/* initialize to-be-configured parameters */
1633
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1634 1635 1636 1637 1638 1639 1640
	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
1641 1642 1643 1644
	/*
	 * common ATA, ATAPI feature tests
	 */

1645
	/* find max transfer mode; for printk only */
1646
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1647

1648 1649
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1650 1651 1652

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1653 1654 1655 1656 1657 1658 1659 1660 1661
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
				ata_dev_printk(dev, KERN_WARNING, "ata%u: device %u  supports DRM functions and may not be fully accessable.\n",
					ap->id, dev->devno);
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1662
		dev->n_sectors = ata_id_n_sectors(id);
1663

1664
		if (ata_id_has_lba(id)) {
1665
			const char *lba_desc;
1666
			char ncq_desc[20];
1667

1668 1669
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1670
			if (ata_id_has_lba48(id)) {
1671
				dev->flags |= ATA_DFLAG_LBA48;
1672
				lba_desc = "LBA48";
1673 1674 1675 1676

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1677
			}
1678

1679 1680 1681
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1682
			/* print device info to dmesg */
1683
			if (ata_msg_drv(ap) && print_info)
1684
				ata_dev_printk(dev, KERN_INFO, "%s, "
1685
					"max %s, %Lu sectors: %s %s\n",
1686
					revbuf,
1687 1688
					ata_mode_string(xfer_mask),
					(unsigned long long)dev->n_sectors,
1689
					lba_desc, ncq_desc);
1690
		} else {
1691 1692 1693
			/* CHS */

			/* Default translation */
1694 1695 1696
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1697

1698
			if (ata_id_current_chs_valid(id)) {
1699
				/* Current CHS translation is valid. */
1700 1701 1702
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1703 1704 1705
			}

			/* print device info to dmesg */
1706
			if (ata_msg_drv(ap) && print_info)
1707
				ata_dev_printk(dev, KERN_INFO, "%s, "
1708
					"max %s, %Lu sectors: CHS %u/%u/%u\n",
1709
					revbuf,
1710 1711
					ata_mode_string(xfer_mask),
					(unsigned long long)dev->n_sectors,
T
Tejun Heo 已提交
1712 1713
					dev->cylinders, dev->heads,
					dev->sectors);
L
Linus Torvalds 已提交
1714 1715
		}

1716 1717
		if (dev->id[59] & 0x100) {
			dev->multi_count = dev->id[59] & 0xff;
1718
			if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1719 1720 1721
				ata_dev_printk(dev, KERN_INFO,
					"ata%u: dev %u multi count %u\n",
					ap->id, dev->devno, dev->multi_count);
1722 1723
		}

1724
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1725 1726 1727
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1728
	else if (dev->class == ATA_DEV_ATAPI) {
1729 1730
		char *cdb_intr_string = "";

1731
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1732
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1733
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1734 1735
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1736
			rc = -EINVAL;
L
Linus Torvalds 已提交
1737 1738
			goto err_out_nosup;
		}
1739
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1740

1741
		if (ata_id_cdb_intr(dev->id)) {
1742
			dev->flags |= ATA_DFLAG_CDB_INTR;
1743 1744
			cdb_intr_string = ", CDB intr";
		}
1745

L
Linus Torvalds 已提交
1746
		/* print device info to dmesg */
1747
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1748 1749 1750
			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
1751 1752
	}

1753 1754 1755 1756 1757
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	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");
		}
	}

1770
	ata_set_port_max_cmd_len(ap);
1771

1772
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1773
	if (ata_dev_knobble(dev)) {
1774
		if (ata_msg_drv(ap) && print_info)
1775 1776
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1777
		dev->udma_mask &= ATA_UDMA5;
1778 1779 1780 1781 1782 1783
		dev->max_sectors = ATA_MAX_SECTORS;
	}

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

1784 1785 1786
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1787
	return 0;
L
Linus Torvalds 已提交
1788 1789

err_out_nosup:
1790
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1791 1792
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1793
	return rc;
L
Linus Torvalds 已提交
1794 1795 1796 1797 1798 1799
}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1800 1801 1802 1803
 *	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
1804
 *	LOCKING:
J
Jeff Garzik 已提交
1805
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1806 1807
 *
 *	RETURNS:
1808
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1809 1810
 */

1811
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1812
{
1813
	unsigned int classes[ATA_MAX_DEVICES];
1814 1815
	int tries[ATA_MAX_DEVICES];
	int i, rc, down_xfermask;
1816
	struct ata_device *dev;
L
Linus Torvalds 已提交
1817

1818
	ata_port_probe(ap);
1819

1820 1821 1822 1823 1824 1825
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
	down_xfermask = 0;

1826
	/* reset and determine device classes */
1827
	ap->ops->phy_reset(ap);
1828

1829 1830
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1831

1832 1833 1834 1835 1836
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1837

1838
		dev->class = ATA_DEV_UNKNOWN;
1839
	}
L
Linus Torvalds 已提交
1840

1841
	ata_port_probe(ap);
1842

A
Alan Cox 已提交
1843 1844 1845 1846 1847 1848
	/* 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;

1849
	/* read IDENTIFY page and configure devices */
L
Linus Torvalds 已提交
1850
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1851
		dev = &ap->device[i];
1852

1853 1854
		if (tries[i])
			dev->class = classes[i];
1855

1856
		if (!ata_dev_enabled(dev))
1857 1858
			continue;

1859 1860
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1861 1862 1863
		if (rc)
			goto fail;

1864 1865 1866
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1867 1868
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1869 1870
	}

1871
	/* configure transfer mode */
1872
	rc = ata_set_mode(ap, &dev);
1873 1874 1875
	if (rc) {
		down_xfermask = 1;
		goto fail;
1876
	}
L
Linus Torvalds 已提交
1877

1878 1879 1880
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1881

1882 1883
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1884
	ap->ops->port_disable(ap);
1885
	return -ENODEV;
1886 1887 1888 1889 1890 1891 1892 1893

 fail:
	switch (rc) {
	case -EINVAL:
	case -ENODEV:
		tries[dev->devno] = 0;
		break;
	case -EIO:
1894
		sata_down_spd_limit(ap);
1895 1896 1897 1898
		/* fall through */
	default:
		tries[dev->devno]--;
		if (down_xfermask &&
T
Tejun Heo 已提交
1899
		    ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1900 1901 1902
			tries[dev->devno] = 0;
	}

1903
	if (!tries[dev->devno]) {
T
Tejun Heo 已提交
1904 1905
		ata_down_xfermask_limit(dev, 1);
		ata_dev_disable(dev);
1906 1907
	}

1908
	goto retry;
L
Linus Torvalds 已提交
1909 1910 1911
}

/**
J
Jeff Garzik 已提交
1912 1913
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1914
 *
J
Jeff Garzik 已提交
1915 1916 1917
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1918
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1919
 *	serialization.
L
Linus Torvalds 已提交
1920 1921 1922 1923
 */

void ata_port_probe(struct ata_port *ap)
{
1924
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1925 1926
}

1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
/**
 *	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)
{
1938
	u32 sstatus, scontrol, tmp;
1939

1940
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1941
		return;
1942
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1943

1944
	if (ata_port_online(ap)) {
1945
		tmp = (sstatus >> 4) & 0xf;
1946 1947 1948
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1949
	} else {
1950 1951 1952
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1953 1954 1955
	}
}

L
Linus Torvalds 已提交
1956
/**
J
Jeff Garzik 已提交
1957 1958
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1959
 *
J
Jeff Garzik 已提交
1960 1961 1962
 *	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
1963 1964
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1965
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1966 1967 1968 1969 1970 1971 1972 1973
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1974
		/* issue phy wake/reset */
1975
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1976 1977 1978
		/* 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
1979
	}
1980 1981
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1982 1983 1984 1985

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1986
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1987 1988 1989 1990
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1991 1992
	/* print link status */
	sata_print_link_status(ap);
1993

1994
	/* TODO: phy layer with polling, timeouts, etc. */
1995
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
1996
		ata_port_probe(ap);
1997
	else
L
Linus Torvalds 已提交
1998 1999
		ata_port_disable(ap);

2000
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
		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
2012 2013
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2014
 *
J
Jeff Garzik 已提交
2015 2016
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2017 2018
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2019
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2020 2021 2022 2023 2024
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2025
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2026 2027 2028 2029
		return;
	ata_bus_reset(ap);
}

2030 2031 2032 2033 2034 2035 2036
/**
 *	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
 */
2037

T
Tejun Heo 已提交
2038
struct ata_device *ata_dev_pair(struct ata_device *adev)
2039
{
T
Tejun Heo 已提交
2040
	struct ata_port *ap = adev->ap;
2041
	struct ata_device *pair = &ap->device[1 - adev->devno];
2042
	if (!ata_dev_enabled(pair))
2043 2044 2045 2046
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2047
/**
J
Jeff Garzik 已提交
2048 2049
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2050
 *
J
Jeff Garzik 已提交
2051 2052 2053 2054 2055
 *	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
2056
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2057
 *	serialization.
L
Linus Torvalds 已提交
2058 2059 2060 2061 2062 2063
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2064
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2065 2066
}

2067
/**
2068
 *	sata_down_spd_limit - adjust SATA spd limit downward
2069 2070 2071 2072
 *	@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
2073
 *	using sata_set_spd().
2074 2075 2076 2077 2078 2079 2080
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2081
int sata_down_spd_limit(struct ata_port *ap)
2082
{
2083 2084
	u32 sstatus, spd, mask;
	int rc, highbit;
2085

2086 2087 2088
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2089 2090 2091 2092 2093 2094 2095

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

2096
	spd = (sstatus >> 4) & 0xf;
2097 2098 2099 2100 2101 2102 2103 2104 2105
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2106 2107
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2108 2109 2110 2111

	return 0;
}

2112
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127
{
	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;
}

/**
2128
 *	sata_set_spd_needed - is SATA spd configuration needed
2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
 *	@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.
 */
2142
int sata_set_spd_needed(struct ata_port *ap)
2143 2144 2145
{
	u32 scontrol;

2146
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2147 2148
		return 0;

2149
	return __sata_set_spd_needed(ap, &scontrol);
2150 2151 2152
}

/**
2153
 *	sata_set_spd - set SATA spd according to spd limit
2154 2155 2156 2157 2158 2159 2160 2161 2162
 *	@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
2163
 *	changed.  Negative errno if SCR registers are inaccessible.
2164
 */
2165
int sata_set_spd(struct ata_port *ap)
2166 2167
{
	u32 scontrol;
2168
	int rc;
2169

2170 2171
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2172

2173
	if (!__sata_set_spd_needed(ap, &scontrol))
2174 2175
		return 0;

2176 2177 2178
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2179 2180 2181
	return 1;
}

A
Alan Cox 已提交
2182 2183 2184 2185 2186
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2187
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2188
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2189 2190 2191
 * 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
2192 2193 2194 2195 2196 2197 2198 2199 2200
 */

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 },

2201 2202
	{ 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
2203 2204 2205 2206 2207
	{ 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 }, */
2208

A
Alan Cox 已提交
2209 2210 2211
	{ 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 },
2212

A
Alan Cox 已提交
2213 2214 2215 2216
	{ 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 },

2217 2218
	{ 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
2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 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
	{ 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
2264
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2265
			return NULL;
2266
	return t;
A
Alan Cox 已提交
2267 2268 2269 2270 2271 2272 2273 2274 2275
}

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;

	/*
2276
	 * Find the mode.
2277
	 */
A
Alan Cox 已提交
2278 2279 2280 2281

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

2282 2283
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303
	/*
	 * 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.
	 */

2304
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2305 2306

	/*
2307 2308 2309
	 * 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
2310 2311
	 */

2312
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2313 2314 2315 2316 2317
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2318
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333
	 */

	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;
}

2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
 *	@force_pio0: Force PIO0
 *
 *	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
 */
T
Tejun Heo 已提交
2349
int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372
{
	unsigned long xfer_mask;
	int highbit;

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

	if (!xfer_mask)
		goto fail;
	/* don't gear down to MWDMA from UDMA, go directly to PIO */
	if (xfer_mask & ATA_MASK_UDMA)
		xfer_mask &= ~ATA_MASK_MWDMA;

	highbit = fls(xfer_mask) - 1;
	xfer_mask &= ~(1 << highbit);
	if (force_pio0)
		xfer_mask &= 1 << ATA_SHIFT_PIO;
	if (!xfer_mask)
		goto fail;

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

2373 2374
	ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
		       ata_mode_string(xfer_mask));
2375 2376 2377 2378 2379 2380 2381

	return 0;

 fail:
	return -EINVAL;
}

T
Tejun Heo 已提交
2382
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2383
{
2384
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2385 2386
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2387

2388
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2389 2390 2391
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2392
	err_mask = ata_dev_set_xfermode(dev);
2393
	if (err_mask) {
2394 2395
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2396 2397
		return -EIO;
	}
L
Linus Torvalds 已提交
2398

2399
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2400
	rc = ata_dev_revalidate(dev, 0);
2401
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2402
	if (rc)
2403
		return rc;
2404

2405 2406
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2407

2408 2409
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2410
	return 0;
L
Linus Torvalds 已提交
2411 2412 2413 2414 2415
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2416
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2417
 *
2418 2419 2420
 *	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
2421
 *
L
Linus Torvalds 已提交
2422
 *	LOCKING:
J
Jeff Garzik 已提交
2423
 *	PCI/etc. bus probe sem.
2424 2425 2426
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2427
 */
2428
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2429
{
2430
	struct ata_device *dev;
2431
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2432

2433 2434 2435 2436 2437 2438
	/* has private set_mode? */
	if (ap->ops->set_mode) {
		/* FIXME: make ->set_mode handle no device case and
		 * return error code and failing device on failure.
		 */
		for (i = 0; i < ATA_MAX_DEVICES; i++) {
2439
			if (ata_dev_ready(&ap->device[i])) {
2440 2441 2442 2443 2444 2445 2446
				ap->ops->set_mode(ap);
				break;
			}
		}
		return 0;
	}

2447 2448
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2449
		unsigned int pio_mask, dma_mask;
2450

2451 2452
		dev = &ap->device[i];

2453
		if (!ata_dev_enabled(dev))
2454 2455
			continue;

T
Tejun Heo 已提交
2456
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2457

2458 2459 2460 2461
		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);
2462

2463
		found = 1;
2464 2465
		if (dev->dma_mode)
			used_dma = 1;
2466
	}
2467
	if (!found)
2468
		goto out;
2469 2470

	/* step 2: always set host PIO timings */
2471 2472 2473 2474 2475 2476
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2477
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2478
			rc = -EINVAL;
2479
			goto out;
2480 2481 2482 2483 2484 2485 2486
		}

		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
2487

2488
	/* step 3: set host DMA timings */
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499
	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
2500 2501

	/* step 4: update devices' xfer mode */
2502
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2503
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2504

2505 2506
		/* don't udpate suspended devices' xfer mode */
		if (!ata_dev_ready(dev))
2507 2508
			continue;

T
Tejun Heo 已提交
2509
		rc = ata_dev_set_mode(dev);
2510
		if (rc)
2511
			goto out;
2512
	}
L
Linus Torvalds 已提交
2513

2514 2515
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2516
	 */
J
Jeff Garzik 已提交
2517 2518
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
		ap->host->simplex_claimed = 1;
2519

2520
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2521 2522 2523
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

2524 2525 2526 2527
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2528 2529
}

2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
/**
 *	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
2540
 *	spin_lock_irqsave(host lock)
2541 2542 2543 2544 2545 2546 2547 2548 2549
 */

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
2550 2551 2552 2553 2554 2555
/**
 *	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
2556 2557 2558
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2559 2560 2561 2562 2563
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2564
 */
2565 2566
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2567 2568 2569 2570 2571 2572 2573
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2574 2575
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2576 2577 2578 2579
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2580
	if (status != 0xff && (status & ATA_BUSY))
2581
		ata_port_printk(ap, KERN_WARNING,
2582 2583
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2584 2585

	timeout = timer_start + tmout;
2586 2587
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2588 2589 2590 2591
		msleep(50);
		status = ata_chk_status(ap);
	}

2592 2593 2594
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2595
	if (status & ATA_BUSY) {
2596
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2597 2598
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2599
		return -EBUSY;
L
Linus Torvalds 已提交
2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680
	}

	return 0;
}

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

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

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

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

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

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

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

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

	/* spec mandates ">= 2ms" before checking status.
	 * We wait 150ms, because that was the magic delay used for
	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
	 * between when the ATA command register is written, and then
	 * status is checked.  Because waiting for "a while" before
	 * checking status is fine, post SRST, we perform this magic
	 * delay here as well.
2681 2682
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2683 2684 2685
	 */
	msleep(150);

2686
	/* Before we perform post reset processing we want to see if
2687 2688 2689
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2690 2691
	if (ata_check_status(ap) == 0xFF)
		return 0;
2692

L
Linus Torvalds 已提交
2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710
	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
2711
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2712
 *	Obtains host lock.
L
Linus Torvalds 已提交
2713 2714
 *
 *	SIDE EFFECTS:
2715
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2716 2717 2718 2719 2720 2721 2722
 */

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
2723
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745

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

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

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

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

	/* issue bus reset */
	if (ap->flags & ATA_FLAG_SRST)
T
Tejun Heo 已提交
2746 2747
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2748 2749 2750 2751

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2752
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2753
	if ((slave_possible) && (err != 0x81))
2754
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
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2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782

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

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

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

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

	DPRINTK("EXIT\n");
	return;

err_out:
2783
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2784 2785 2786 2787 2788
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807
/**
 *	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)
2808
{
2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863
	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;
2864 2865 2866 2867
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2868

2869
	scontrol = (scontrol & 0x0f0) | 0x300;
2870 2871 2872

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2873

2874 2875 2876 2877
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2878

2879
	return sata_phy_debounce(ap, params);
2880 2881
}

2882 2883 2884 2885 2886 2887 2888 2889
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) {
2890
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925

		/* 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;
2926
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2927 2928
	int rc;

2929 2930 2931 2932 2933 2934 2935 2936
	/* 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);
2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961

	/* 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;
}

2962 2963 2964 2965 2966
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2967
 *	Reset host port using ATA SRST.
2968 2969 2970 2971 2972 2973 2974
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2975
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2976 2977 2978 2979 2980 2981 2982
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

2983
	if (ata_port_offline(ap)) {
2984 2985 2986 2987
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000
	/* 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) {
3001 3002
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
3003 3004 3005 3006 3007 3008 3009 3010
		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);

3011
 out:
3012 3013 3014 3015 3016
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3017
 *	sata_port_hardreset - reset port via SATA phy reset
3018
 *	@ap: port to reset
3019
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3020 3021 3022 3023 3024 3025 3026 3027 3028
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3029
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3030
{
3031
	u32 scontrol;
3032
	int rc;
3033

3034 3035
	DPRINTK("ENTER\n");

3036
	if (sata_set_spd_needed(ap)) {
3037 3038 3039 3040 3041
		/* 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.
		 */
3042
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3043
			goto out;
3044

3045
		scontrol = (scontrol & 0x0f0) | 0x304;
3046 3047

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3048
			goto out;
3049

3050
		sata_set_spd(ap);
3051 3052 3053
	}

	/* issue phy wake/reset */
3054
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3055
		goto out;
3056

3057
	scontrol = (scontrol & 0x0f0) | 0x301;
3058 3059

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3060
		goto out;
3061

3062
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3063 3064 3065 3066
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3067
	/* bring phy back */
3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101
	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;
	}
3102 3103

	/* TODO: phy layer with polling, timeouts, etc. */
3104
	if (ata_port_offline(ap)) {
3105 3106 3107 3108 3109 3110
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3111 3112
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3113 3114 3115
		return -EIO;
	}

3116 3117
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137
	*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)
{
3138 3139
	u32 serror;

3140 3141 3142
	DPRINTK("ENTER\n");

	/* print link status */
3143
	sata_print_link_status(ap);
3144

3145 3146 3147 3148
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3149
	/* re-enable interrupts */
3150 3151 3152 3153 3154
	if (!ap->ops->error_handler) {
		/* FIXME: hack. create a hook instead */
		if (ap->ioaddr.ctl_addr)
			ata_irq_on(ap);
	}
3155 3156 3157 3158 3159 3160 3161

	/* 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);

3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174
	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		DPRINTK("EXIT, no device\n");
		return;
	}

	/* set up device control */
	if (ap->ioaddr.ctl_addr) {
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
		else
			outb(ap->ctl, ap->ioaddr.ctl_addr);
	}
3175 3176 3177 3178

	DPRINTK("EXIT\n");
}

3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194
/**
 *	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
3195 3196
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3197 3198 3199 3200 3201 3202
{
	const u16 *old_id = dev->id;
	unsigned char model[2][41], serial[2][21];
	u64 new_n_sectors;

	if (dev->class != new_class) {
3203 3204
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3205 3206 3207 3208 3209 3210 3211 3212 3213 3214
		return 0;
	}

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

	if (strcmp(model[0], model[1])) {
3215 3216
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3217 3218 3219 3220
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3221 3222
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3223 3224 3225 3226
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3227 3228 3229 3230
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3231 3232 3233 3234 3235 3236 3237 3238 3239
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3240
 *	@readid_flags: read ID flags
3241 3242 3243 3244 3245 3246 3247 3248 3249 3250
 *
 *	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
 */
3251
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3252
{
3253
	unsigned int class = dev->class;
3254
	u16 *id = (void *)dev->ap->sector_buf;
3255 3256
	int rc;

3257 3258 3259 3260
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3261

3262
	/* read ID data */
3263
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3264 3265 3266 3267
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3268
	if (!ata_dev_same_device(dev, class, id)) {
3269 3270 3271 3272
		rc = -ENODEV;
		goto fail;
	}

3273
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3274 3275

	/* configure device according to the new ID */
3276
	rc = ata_dev_configure(dev);
3277 3278
	if (rc == 0)
		return 0;
3279 3280

 fail:
3281
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3282 3283 3284
	return rc;
}

3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333
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 },
	{ "SanDisk SDP3B-64", 	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 },

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3334
};
3335

3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346
static int ata_strim(char *s, size_t len)
{
	len = strnlen(s, len);

	/* ATAPI specifies that empty space is blank-filled; remove blanks */
	while ((len > 0) && (s[len - 1] == ' ')) {
		len--;
		s[len] = 0;
	}
	return len;
}
L
Linus Torvalds 已提交
3347

3348
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3349
{
3350 3351 3352
	unsigned char model_num[40];
	unsigned char model_rev[16];
	unsigned int nlen, rlen;
3353
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3354

3355 3356 3357 3358 3359 3360
	ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
			  sizeof(model_num));
	ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
			  sizeof(model_rev));
	nlen = ata_strim(model_num, sizeof(model_num));
	rlen = ata_strim(model_rev, sizeof(model_rev));
L
Linus Torvalds 已提交
3361

3362 3363 3364 3365 3366 3367
	while (ad->model_num) {
		if (!strncmp(ad->model_num, model_num, nlen)) {
			if (ad->model_rev == NULL)
				return ad->horkage;
			if (!strncmp(ad->model_rev, model_rev, rlen))
				return ad->horkage;
3368
		}
3369
		ad++;
3370
	}
L
Linus Torvalds 已提交
3371 3372 3373
	return 0;
}

3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385
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;
}

3386 3387 3388 3389
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3390 3391 3392 3393
 *	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...
3394 3395 3396 3397
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3398
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3399
{
T
Tejun Heo 已提交
3400
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3401
	struct ata_host *host = ap->host;
3402
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3403

3404
	/* controller modes available */
3405 3406 3407 3408 3409 3410 3411 3412
	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);
3413 3414 3415 3416 3417 3418 3419
	/* 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
3420

3421 3422 3423
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3424

3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435
	/*
	 *	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));
	}

3436 3437
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3438 3439
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3440
	}
3441

J
Jeff Garzik 已提交
3442
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
3443 3444 3445
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3446
	}
3447

3448 3449 3450
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3451 3452
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3453 3454 3455 3456 3457 3458
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3459 3460 3461
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3462
 *	LOCKING:
J
Jeff Garzik 已提交
3463
 *	PCI/etc. bus probe sem.
3464 3465 3466
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3467 3468
 */

T
Tejun Heo 已提交
3469
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3470
{
3471
	struct ata_taskfile tf;
3472
	unsigned int err_mask;
L
Linus Torvalds 已提交
3473 3474 3475 3476

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

T
Tejun Heo 已提交
3477
	ata_tf_init(dev, &tf);
3478 3479 3480 3481 3482
	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
3483

T
Tejun Heo 已提交
3484
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3485

3486 3487
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3488 3489
}

3490 3491 3492
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3493 3494
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3495 3496
 *
 *	LOCKING:
3497 3498 3499 3500
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3501
 */
T
Tejun Heo 已提交
3502 3503
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3504
{
3505
	struct ata_taskfile tf;
3506
	unsigned int err_mask;
3507 3508 3509

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3510
		return AC_ERR_INVALID;
3511 3512 3513 3514

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

T
Tejun Heo 已提交
3515
	ata_tf_init(dev, &tf);
3516 3517 3518 3519 3520
	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 */
3521

T
Tejun Heo 已提交
3522
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3523

3524 3525
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3526 3527
}

L
Linus Torvalds 已提交
3528
/**
J
Jeff Garzik 已提交
3529 3530 3531 3532
 *	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
3533 3534
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3535
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3536
 */
3537
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3538 3539
{
	struct ata_port *ap = qc->ap;
3540
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3541
	int dir = qc->dma_dir;
3542
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3543

3544 3545
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3546 3547

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3548
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3549

J
Jeff Garzik 已提交
3550
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3551

3552 3553 3554 3555 3556 3557 3558 3559
	/* 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) {
3560
		if (qc->n_elem)
3561
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3562 3563 3564 3565 3566 3567
		/* 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);
3568
			kunmap_atomic(addr, KM_IRQ0);
3569 3570
		}
	} else {
3571
		if (qc->n_elem)
3572
			dma_unmap_single(ap->dev,
3573 3574
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3575 3576 3577 3578 3579 3580
		/* 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
3581 3582

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3583
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3584 3585 3586 3587 3588 3589
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3590 3591 3592
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3593
 *	LOCKING:
J
Jeff Garzik 已提交
3594
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3595 3596 3597 3598 3599
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3600 3601
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3602

3603
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3604
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3605 3606

	idx = 0;
3607
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640
		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
3641 3642 3643 3644
 *	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
3645
 *	LOCKING:
J
Jeff Garzik 已提交
3646
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3647
 *
L
Linus Torvalds 已提交
3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664
 *	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
3665 3666
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3667
 *	LOCKING:
J
Jeff Garzik 已提交
3668
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3669 3670 3671 3672 3673 3674 3675 3676 3677
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3678 3679
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3680 3681 3682 3683 3684 3685 3686 3687 3688 3689
/**
 *	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
3690
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3691 3692
 */

L
Linus Torvalds 已提交
3693 3694 3695 3696
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3697
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3698
	qc->n_elem = 1;
3699
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3700
	qc->buf_virt = buf;
3701
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3702

3703
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3704 3705
}

J
Jeff Garzik 已提交
3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716
/**
 *	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
3717
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3718 3719
 */

L
Linus Torvalds 已提交
3720 3721 3722 3723
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3724
	qc->__sg = sg;
L
Linus Torvalds 已提交
3725
	qc->n_elem = n_elem;
3726
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3727 3728 3729
}

/**
J
Jeff Garzik 已提交
3730 3731 3732 3733
 *	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
3734 3735
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3736
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3737 3738
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3739
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3740 3741 3742 3743 3744 3745
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3746
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3747
	dma_addr_t dma_address;
3748
	int trim_sg = 0;
L
Linus Torvalds 已提交
3749

3750 3751 3752 3753 3754 3755
	/* 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;

3756
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767

		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;
3768 3769
		if (sg->length == 0)
			trim_sg = 1;
3770 3771 3772 3773 3774

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

3775 3776
	if (trim_sg) {
		qc->n_elem--;
3777 3778 3779
		goto skip_map;
	}

3780
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3781
				     sg->length, dir);
3782 3783 3784
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3785
		return -1;
3786
	}
L
Linus Torvalds 已提交
3787 3788

	sg_dma_address(sg) = dma_address;
3789
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3790

3791
skip_map:
L
Linus Torvalds 已提交
3792 3793 3794 3795 3796 3797 3798
	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
3799 3800 3801 3802
 *	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
3803 3804
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3805
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3806 3807
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3808
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3809 3810 3811 3812 3813 3814
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3815 3816
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3817
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3818 3819

	VPRINTK("ENTER, ata%u\n", ap->id);
3820
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3821

3822 3823 3824 3825 3826 3827 3828
	/* 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;

3829
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843

		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);
3844
			kunmap_atomic(addr, KM_IRQ0);
3845 3846 3847 3848 3849 3850
		}

		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;
3851 3852
		if (lsg->length == 0)
			trim_sg = 1;
3853 3854 3855 3856 3857

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

3858 3859 3860 3861 3862 3863 3864 3865 3866
	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
3867
	dir = qc->dma_dir;
3868
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3869 3870 3871
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3872
		return -1;
3873
	}
L
Linus Torvalds 已提交
3874 3875 3876

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

3877
skip_map:
L
Linus Torvalds 已提交
3878 3879 3880 3881 3882
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3883
/**
3884
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3885 3886 3887 3888 3889 3890 3891 3892
 *	@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
3893
 *	Inherited from caller.
E
Edward Falk 已提交
3894
 */
L
Linus Torvalds 已提交
3895 3896 3897 3898 3899 3900 3901 3902 3903 3904
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
3905 3906
/**
 *	ata_mmio_data_xfer - Transfer data by MMIO
3907
 *	@adev: device for this I/O
A
Albert Lee 已提交
3908 3909
 *	@buf: data buffer
 *	@buflen: buffer length
3910
 *	@write_data: read/write
A
Albert Lee 已提交
3911 3912 3913 3914 3915 3916 3917
 *
 *	Transfer data from/to the device data register by MMIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

T
Tejun Heo 已提交
3918
void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
3919
			unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3920
{
3921
	struct ata_port *ap = adev->ap;
L
Linus Torvalds 已提交
3922 3923 3924 3925 3926
	unsigned int i;
	unsigned int words = buflen >> 1;
	u16 *buf16 = (u16 *) buf;
	void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;

A
Albert Lee 已提交
3927
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3928 3929 3930 3931 3932 3933 3934
	if (write_data) {
		for (i = 0; i < words; i++)
			writew(le16_to_cpu(buf16[i]), mmio);
	} else {
		for (i = 0; i < words; i++)
			buf16[i] = cpu_to_le16(readw(mmio));
	}
A
Albert Lee 已提交
3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948

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

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
			writew(le16_to_cpu(align_buf[0]), mmio);
		} else {
			align_buf[0] = cpu_to_le16(readw(mmio));
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3949 3950
}

A
Albert Lee 已提交
3951 3952
/**
 *	ata_pio_data_xfer - Transfer data by PIO
3953
 *	@adev: device to target
A
Albert Lee 已提交
3954 3955
 *	@buf: data buffer
 *	@buflen: buffer length
3956
 *	@write_data: read/write
A
Albert Lee 已提交
3957 3958 3959 3960 3961 3962 3963
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

T
Tejun Heo 已提交
3964
void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
3965
		       unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3966
{
3967
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3968
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3969

A
Albert Lee 已提交
3970
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3971
	if (write_data)
A
Albert Lee 已提交
3972
		outsw(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3973
	else
A
Albert Lee 已提交
3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988
		insw(ap->ioaddr.data_addr, buf, words);

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

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
			outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
		} else {
			align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3989 3990
}

3991 3992 3993 3994 3995 3996 3997
/**
 *	ata_pio_data_xfer_noirq - Transfer data by PIO
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3998
 *	Transfer data from/to the device data register by PIO. Do the
3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
				    unsigned int buflen, int write_data)
{
	unsigned long flags;
	local_irq_save(flags);
	ata_pio_data_xfer(adev, buf, buflen, write_data);
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4015 4016 4017 4018 4019 4020 4021 4022 4023 4024
/**
 *	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
4025 4026 4027
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4028
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4029 4030 4031 4032 4033 4034
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

	if (qc->cursect == (qc->nsect - 1))
A
Albert Lee 已提交
4035
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4036 4037 4038 4039 4040 4041 4042 4043 4044 4045

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

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

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

4046 4047 4048
	if (PageHighMem(page)) {
		unsigned long flags;

4049
		/* FIXME: use a bounce buffer */
4050 4051
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4052

4053
		/* do the actual data transfer */
4054
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
4055

4056 4057 4058 4059
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4060
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
4061
	}
L
Linus Torvalds 已提交
4062 4063 4064 4065

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

4066
	if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4067 4068 4069 4070 4071
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4072 4073 4074 4075
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
4076
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
4077 4078 4079 4080 4081
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4082

4083 4084 4085 4086 4087 4088
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
4089
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4090

4091 4092 4093 4094 4095 4096 4097
		nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113
/**
 *	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");
4114
	WARN_ON(qc->dev->cdb_len < 12);
4115

4116
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131
	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
4132 4133
}

A
Albert Lee 已提交
4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145
/**
 *	__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
4146 4147 4148
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4149
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4150 4151 4152 4153 4154
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4155
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4156
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4157 4158

next_sg:
4159
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4160
		/*
4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171
		 * 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 */
4172 4173
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4174 4175

		for (i = 0; i < words; i++)
4176
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4177

A
Albert Lee 已提交
4178
		ap->hsm_task_state = HSM_ST_LAST;
4179 4180 4181
		return;
	}

4182
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4183 4184 4185 4186 4187 4188 4189 4190

	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;

4191
	/* don't overrun current sg */
4192
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4193 4194 4195 4196

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

4197 4198
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4199 4200 4201
	if (PageHighMem(page)) {
		unsigned long flags;

4202
		/* FIXME: use bounce buffer */
4203 4204
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4205

4206
		/* do the actual data transfer */
4207
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4208

4209 4210 4211 4212
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4213
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4214
	}
L
Linus Torvalds 已提交
4215 4216 4217 4218 4219

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

4220
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4221 4222 4223 4224
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4225
	if (bytes)
L
Linus Torvalds 已提交
4226 4227 4228
		goto next_sg;
}

A
Albert Lee 已提交
4229 4230 4231 4232 4233 4234 4235 4236 4237 4238
/**
 *	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
4239 4240 4241 4242 4243 4244 4245
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;

4246 4247 4248 4249 4250 4251 4252 4253 4254 4255
	/* 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
4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266
	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;

4267 4268
	VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);

L
Linus Torvalds 已提交
4269 4270 4271 4272 4273
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4274
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4275
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4276
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4277 4278 4279
}

/**
4280 4281 4282
 *	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
4283
 *
4284 4285
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4286
 */
4287 4288

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4289
{
4290 4291
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4292

4293 4294 4295 4296
	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
4297

4298 4299 4300
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4301 4302
	}

4303 4304
	return 0;
}
L
Linus Torvalds 已提交
4305

T
Tejun Heo 已提交
4306 4307 4308 4309 4310 4311 4312 4313
/**
 *	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
4314
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4315 4316 4317 4318 4319 4320 4321 4322 4323
 *	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) {
4324
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4325

J
Jeff Garzik 已提交
4326 4327
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4328 4329 4330 4331 4332 4333 4334 4335 4336 4337
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
					ata_irq_on(ap);
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4338
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4339 4340 4341 4342 4343 4344 4345 4346
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4347
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4348 4349
			ata_irq_on(ap);
			ata_qc_complete(qc);
4350
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4351 4352 4353
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4354

4355
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4356 4357
}

4358 4359 4360 4361 4362 4363 4364 4365 4366 4367
/**
 *	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.
 */
4368 4369
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4370
{
4371 4372 4373
	unsigned long flags = 0;
	int poll_next;

4374 4375
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4376 4377 4378 4379
	/* 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).
	 */
4380
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4381

4382
fsm_start:
4383 4384 4385
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state, status);

4386 4387
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4388 4389 4390 4391 4392 4393 4394 4395
		/* 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);

4396
		/* check device status */
4397 4398 4399 4400 4401 4402 4403 4404 4405
		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
4406
			ap->hsm_task_state = HSM_ST_ERR;
4407
			goto fsm_start;
L
Linus Torvalds 已提交
4408 4409
		}

4410 4411
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4412 4413 4414
		 * 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.
4415 4416 4417 4418
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
			       ap->id, status);
4419
			qc->err_mask |= AC_ERR_HSM;
4420 4421
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4422
		}
L
Linus Torvalds 已提交
4423

4424 4425 4426 4427 4428 4429
		/* 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)
4430
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4431

4432 4433 4434 4435
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4436

4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448
			/* 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)
4449
			spin_unlock_irqrestore(ap->lock, flags);
4450 4451 4452 4453

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4454
		break;
4455

4456 4457 4458 4459 4460
	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) {
4461 4462 4463
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4464 4465 4466
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4467

4468 4469
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4470 4471 4472
			 * 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.
4473 4474 4475 4476
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
				       ap->id, status);
4477
				qc->err_mask |= AC_ERR_HSM;
4478 4479
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4480
			}
L
Linus Torvalds 已提交
4481

4482
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4483

4484 4485 4486
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4487

4488 4489 4490 4491
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4492 4493 4494 4495
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4496 4497 4498 4499 4500 4501
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4502

4503 4504 4505
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4506

4507 4508 4509 4510 4511 4512 4513 4514 4515
			/* 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.
4516 4517 4518 4519
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4520 4521 4522 4523 4524 4525 4526

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

4527 4528 4529
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4530 4531 4532 4533 4534 4535
				/* 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;
4536 4537
			}

4538 4539 4540 4541 4542 4543
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4544
				status = ata_wait_idle(ap);
4545 4546 4547 4548 4549
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4550
		poll_next = 1;
L
Linus Torvalds 已提交
4551 4552
		break;

A
Albert Lee 已提交
4553
	case HSM_ST_LAST:
4554 4555
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4556 4557 4558 4559 4560
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4561 4562
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
			ap->id, qc->dev->devno, status);
4563

4564 4565
		WARN_ON(qc->err_mask);

4566
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4567

4568
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4569
		ata_hsm_qc_complete(qc, in_wq);
4570 4571

		poll_next = 0;
L
Linus Torvalds 已提交
4572 4573
		break;

A
Albert Lee 已提交
4574
	case HSM_ST_ERR:
4575 4576 4577 4578 4579 4580
		/* 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;
4581

4582
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4583
		ata_hsm_qc_complete(qc, in_wq);
4584 4585

		poll_next = 0;
4586 4587
		break;
	default:
4588
		poll_next = 0;
4589
		BUG();
L
Linus Torvalds 已提交
4590 4591
	}

4592
	return poll_next;
L
Linus Torvalds 已提交
4593 4594
}

4595
static void ata_pio_task(struct work_struct *work)
4596
{
4597 4598 4599
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4600
	u8 status;
4601
	int poll_next;
4602

J
Jeff Garzik 已提交
4603
fsm_start:
4604
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4605

4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617
	/*
	 * 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) {
4618
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4619 4620
			return;
		}
4621 4622
	}

4623 4624
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4625

4626 4627 4628 4629
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4630
		goto fsm_start;
4631 4632
}

L
Linus Torvalds 已提交
4633 4634 4635 4636 4637 4638
/**
 *	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
4639
 *	None.
L
Linus Torvalds 已提交
4640 4641 4642 4643 4644 4645 4646
 */

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

4647
	/* no command while frozen */
4648
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4649 4650
		return NULL;

4651 4652
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4653
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4654
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668
			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
4669
 *	None.
L
Linus Torvalds 已提交
4670 4671
 */

T
Tejun Heo 已提交
4672
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4673
{
T
Tejun Heo 已提交
4674
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4675 4676 4677 4678 4679 4680 4681 4682
	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
4683
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696
	}

	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
4697
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4698 4699 4700
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4701 4702 4703
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4704
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4705

4706 4707 4708 4709
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4710
		clear_bit(tag, &ap->qc_allocated);
4711
	}
L
Linus Torvalds 已提交
4712 4713
}

4714
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4715
{
4716 4717
	struct ata_port *ap = qc->ap;

4718 4719
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4720 4721 4722 4723

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

4724
	/* command should be marked inactive atomically with qc completion */
4725 4726 4727 4728
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4729

4730 4731 4732 4733 4734
	/* 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;
4735
	ap->qc_active &= ~(1 << qc->tag);
4736

L
Linus Torvalds 已提交
4737
	/* call completion callback */
4738
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4739 4740
}

4741 4742 4743 4744 4745 4746 4747 4748
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;
}

4749 4750 4751 4752 4753 4754 4755 4756 4757
/**
 *	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
4758
 *	spin_lock_irqsave(host lock)
4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777
 */
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) {
4778
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4779 4780 4781 4782 4783 4784 4785

		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 */
4786
				fill_result_tf(qc);
4787 4788 4789 4790 4791 4792 4793
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4794
			fill_result_tf(qc);
4795 4796 4797 4798 4799 4800 4801 4802

		__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)
4803
			fill_result_tf(qc);
4804 4805 4806 4807 4808

		__ata_qc_complete(qc);
	}
}

4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820
/**
 *	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
4821
 *	spin_lock_irqsave(host lock)
4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857
 *
 *	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
4858 4859 4860 4861 4862
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4863
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891
	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
4892
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4893
 */
4894
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4895 4896 4897
{
	struct ata_port *ap = qc->ap;

4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911
	/* 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;
	}

4912
	qc->flags |= ATA_QCFLAG_ACTIVE;
4913
	ap->qc_active |= 1 << qc->tag;
4914

L
Linus Torvalds 已提交
4915 4916 4917
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4918
				goto sg_err;
L
Linus Torvalds 已提交
4919 4920
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4921
				goto sg_err;
L
Linus Torvalds 已提交
4922 4923 4924 4925 4926 4927 4928
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4929 4930 4931 4932
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4933

4934 4935
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4936 4937 4938
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949
}

/**
 *	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
4950 4951
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4952
 *	LOCKING:
J
Jeff Garzik 已提交
4953
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4954 4955
 *
 *	RETURNS:
4956
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4957 4958
 */

4959
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4960 4961 4962
{
	struct ata_port *ap = qc->ap;

4963 4964 4965 4966 4967 4968
	/* 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:
4969
		case ATA_PROT_NODATA:
4970 4971 4972 4973 4974 4975
		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)
4976
				/* see ata_dma_blacklisted() */
4977 4978 4979 4980 4981 4982 4983
				BUG();
			break;
		default:
			break;
		}
	}

4984 4985 4986 4987 4988 4989 4990 4991
	/* 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;

4992
	/* select the device */
L
Linus Torvalds 已提交
4993 4994
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4995
	/* start the command */
L
Linus Torvalds 已提交
4996 4997
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4998 4999 5000
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5001
		ata_tf_to_host(ap, &qc->tf);
5002 5003 5004
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5005
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5006

L
Linus Torvalds 已提交
5007 5008 5009
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5010
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5011

L
Linus Torvalds 已提交
5012 5013 5014
		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 */
5015
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5016 5017
		break;

5018 5019 5020
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5021

J
Jeff Garzik 已提交
5022
		ata_tf_to_host(ap, &qc->tf);
5023

5024 5025 5026
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5027
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5028 5029

			/* always send first data block using
5030
			 * the ata_pio_task() codepath.
5031
			 */
5032
		} else {
5033 5034 5035 5036
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5037
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5038 5039 5040 5041

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5042 5043
		}

L
Linus Torvalds 已提交
5044 5045 5046 5047
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5048 5049 5050
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5051
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5052

5053 5054 5055 5056 5057
		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))
5058
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5059 5060 5061
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5062
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5063

L
Linus Torvalds 已提交
5064 5065
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5066 5067 5068 5069
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5070
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5071 5072 5073 5074
		break;

	default:
		WARN_ON(1);
5075
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090
	}

	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
5091
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5092 5093 5094 5095 5096 5097 5098 5099
 *
 *	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)
{
5100
	struct ata_eh_info *ehi = &ap->eh_info;
5101
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5102

5103 5104
	VPRINTK("ata%u: protocol %d task_state %d\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5105

5106 5107 5108
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5109 5110 5111
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5112

5113 5114 5115 5116 5117
		/* 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
5118 5119
			goto idle_irq;
		break;
5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132
	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);
			VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);

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

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
5133 5134 5135 5136 5137 5138

			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;
			}
5139 5140 5141 5142
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5143 5144 5145 5146
	default:
		goto idle_irq;
	}

5147 5148 5149 5150
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5151

5152 5153 5154 5155
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5156

5157 5158
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5159

5160
	ata_hsm_move(ap, qc, status, 0);
5161 5162 5163 5164 5165

	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
5166 5167 5168 5169 5170 5171 5172 5173
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
		ata_irq_ack(ap, 0); /* debug trap */
5174
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5175
		return 1;
L
Linus Torvalds 已提交
5176 5177 5178 5179 5180 5181 5182
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5183
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5184
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5185
 *
J
Jeff Garzik 已提交
5186 5187 5188
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5189
 *	LOCKING:
J
Jeff Garzik 已提交
5190
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5191 5192
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5193
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5194 5195
 */

5196
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5197
{
J
Jeff Garzik 已提交
5198
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5199 5200 5201 5202 5203
	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
5204
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5205

J
Jeff Garzik 已提交
5206
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5207 5208
		struct ata_port *ap;

J
Jeff Garzik 已提交
5209
		ap = host->ports[i];
5210
		if (ap &&
J
Jeff Garzik 已提交
5211
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5212 5213 5214
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5215
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5216
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5217 5218 5219 5220
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5221
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5222 5223 5224 5225

	return IRQ_RETVAL(handled);
}

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 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362
/**
 *	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
5363

5364
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5365
{
5366
	unsigned int err_mask;
J
Jens Axboe 已提交
5367 5368 5369 5370 5371
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5372
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5373 5374 5375 5376
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5377 5378 5379 5380 5381 5382 5383
	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
5384 5385
}

J
Jeff Garzik 已提交
5386 5387 5388
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5389 5390 5391 5392
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5393 5394
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433

		/* 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
5434 5435
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5436 5437
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5438
 *	Suspend @host.  Actual operation is performed by EH.  This
5439 5440 5441 5442 5443 5444 5445 5446 5447
 *	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
5448
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5449 5450 5451
{
	int i, j, rc;

J
Jeff Garzik 已提交
5452
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5453 5454 5455 5456 5457 5458 5459
	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
5460 5461
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475

		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
5476
	host->dev->power.power_state = mesg;
5477 5478 5479
	return 0;

 fail:
J
Jeff Garzik 已提交
5480
	ata_host_resume(host);
5481 5482 5483 5484
	return rc;
}

/**
J
Jeff Garzik 已提交
5485 5486
 *	ata_host_resume - resume host
 *	@host: host to resume
5487
 *
J
Jeff Garzik 已提交
5488
 *	Resume @host.  Actual operation is performed by EH.  This
5489 5490 5491 5492 5493 5494
 *	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
5495
void ata_host_resume(struct ata_host *host)
5496
{
J
Jeff Garzik 已提交
5497 5498 5499
	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;
5500 5501
}

5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514
/**
 *	ata_port_start - Set port up for dma.
 *	@ap: Port to initialize
 *
 *	Called just after data structures for each port are
 *	initialized.  Allocates space for PRD table.
 *
 *	May be used as the port_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
5515 5516
int ata_port_start (struct ata_port *ap)
{
5517
	struct device *dev = ap->dev;
5518
	int rc;
L
Linus Torvalds 已提交
5519 5520 5521 5522 5523

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

5524 5525
	rc = ata_pad_alloc(ap, dev);
	if (rc) {
5526
		dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
5527
		return rc;
5528 5529
	}

L
Linus Torvalds 已提交
5530 5531 5532 5533 5534
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);

	return 0;
}

E
Edward Falk 已提交
5535 5536 5537 5538 5539 5540 5541 5542 5543 5544

/**
 *	ata_port_stop - Undo ata_port_start()
 *	@ap: Port to shut down
 *
 *	Frees the PRD table.
 *
 *	May be used as the port_stop() entry in ata_port_operations.
 *
 *	LOCKING:
R
Randy Dunlap 已提交
5545
 *	Inherited from caller.
E
Edward Falk 已提交
5546 5547
 */

L
Linus Torvalds 已提交
5548 5549
void ata_port_stop (struct ata_port *ap)
{
5550
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5551 5552

	dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
5553
	ata_pad_free(ap, dev);
L
Linus Torvalds 已提交
5554 5555
}

J
Jeff Garzik 已提交
5556
void ata_host_stop (struct ata_host *host)
J
Jeff Garzik 已提交
5557
{
J
Jeff Garzik 已提交
5558 5559
	if (host->mmio_base)
		iounmap(host->mmio_base);
J
Jeff Garzik 已提交
5560 5561
}

5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573
/**
 *	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;
5574 5575
	unsigned long flags;

5576 5577 5578
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5579 5580
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5581
	 * host lock.
5582
	 */
5583
	spin_lock_irqsave(ap->lock, flags);
5584
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5585
	spin_unlock_irqrestore(ap->lock, flags);
5586

5587 5588
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5589 5590 5591 5592 5593
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5594
/**
B
Brian King 已提交
5595
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5596
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5597
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5598 5599 5600
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5601
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5602
 *
L
Linus Torvalds 已提交
5603
 *	LOCKING:
J
Jeff Garzik 已提交
5604
 *	Inherited from caller.
L
Linus Torvalds 已提交
5605
 */
J
Jeff Garzik 已提交
5606
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5607
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5608 5609 5610
{
	unsigned int i;

J
Jeff Garzik 已提交
5611
	ap->lock = &host->lock;
5612
	ap->flags = ATA_FLAG_DISABLED;
B
Brian King 已提交
5613
	ap->id = ata_unique_id++;
L
Linus Torvalds 已提交
5614
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5615
	ap->host = host;
5616
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5617
	ap->port_no = port_no;
5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630
	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;
	}
5631
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5632 5633
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5634 5635 5636 5637 5638 5639

#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
5640
#else
5641
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5642
#endif
L
Linus Torvalds 已提交
5643

5644 5645 5646
	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);
5647
	INIT_LIST_HEAD(&ap->eh_done_q);
5648
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5649

5650 5651 5652 5653 5654
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5655 5656
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5657
		dev->ap = ap;
5658
		dev->devno = i;
5659
		ata_dev_init(dev);
5660
	}
L
Linus Torvalds 已提交
5661 5662 5663 5664 5665 5666 5667 5668 5669

#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
5670
/**
5671 5672 5673
 *	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
5674
 *
5675
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5676 5677 5678 5679
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5680
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5681
{
J
Jeff Garzik 已提交
5682
	ap->scsi_host = shost;
B
Brian King 已提交
5683

5684 5685 5686 5687 5688
	shost->unique_id = ap->id;
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5689 5690
}

L
Linus Torvalds 已提交
5691
/**
5692
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5693
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5694
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5695 5696
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5697 5698
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5699
 *	LOCKING:
J
Jeff Garzik 已提交
5700
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5701 5702
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5703
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5704
 */
5705
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5706
				      struct ata_host *host,
L
Linus Torvalds 已提交
5707 5708
				      unsigned int port_no)
{
5709
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5710 5711 5712
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5713

5714
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5715
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5716 5717 5718 5719 5720
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5721 5722
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5723 5724
		return NULL;

5725
	shost->transportt = &ata_scsi_transport_template;
5726

5727
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5728

J
Jeff Garzik 已提交
5729
	ata_port_init(ap, host, ent, port_no);
5730
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5731 5732 5733 5734

	return ap;
}

5735
/**
J
Jeff Garzik 已提交
5736 5737 5738 5739 5740
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5741 5742 5743 5744 5745 5746
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5747 5748
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5749
{
J
Jeff Garzik 已提交
5750 5751 5752 5753
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5754 5755
}

L
Linus Torvalds 已提交
5756
/**
J
Jeff Garzik 已提交
5757 5758 5759 5760 5761 5762 5763 5764 5765 5766
 *	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
5767 5768
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5769
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5770 5771
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5772
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5773
 */
J
Jeff Garzik 已提交
5774
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5775
{
5776
	unsigned int i;
L
Linus Torvalds 已提交
5777
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5778
	struct ata_host *host;
5779
	int rc;
L
Linus Torvalds 已提交
5780 5781

	DPRINTK("ENTER\n");
5782 5783 5784 5785 5786
	
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
L
Linus Torvalds 已提交
5787
	/* alloc a container for our list of ATA ports (buses) */
J
Jeff Garzik 已提交
5788 5789 5790
	host = kzalloc(sizeof(struct ata_host) +
		       (ent->n_ports * sizeof(void *)), GFP_KERNEL);
	if (!host)
L
Linus Torvalds 已提交
5791 5792
		return 0;

J
Jeff Garzik 已提交
5793 5794 5795 5796 5797 5798
	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;
	host->mmio_base = ent->mmio_base;
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5799 5800

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5801
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5802 5803
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5804
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5805

J
Jeff Garzik 已提交
5806
		ap = ata_port_add(ent, host, i);
5807
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5808 5809 5810
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5811 5812 5813 5814 5815 5816 5817 5818 5819 5820
		/* 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
5821 5822
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5823 5824 5825
			goto err_out;
		}

5826 5827 5828 5829
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5830 5831 5832 5833 5834
		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 */
5835
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
5836
				"ctl 0x%lX bmdma 0x%lX irq %d\n",
5837 5838 5839 5840 5841
				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,
5842
				irq_line);
L
Linus Torvalds 已提交
5843

5844 5845
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5846 5847
	}

5848
	/* obtain irq, that may be shared between channels */
5849
	rc = request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
J
Jeff Garzik 已提交
5850
			 DRV_NAME, host);
5851 5852 5853
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5854
		goto err_out;
5855
	}
L
Linus Torvalds 已提交
5856

5857 5858 5859 5860 5861 5862 5863
	/* 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);

		rc = request_irq(ent->irq2, ent->port_ops->irq_handler, ent->irq_flags,
J
Jeff Garzik 已提交
5864
			 DRV_NAME, host);
5865 5866 5867 5868 5869 5870 5871
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
			goto err_out_free_irq;
		}
	}

L
Linus Torvalds 已提交
5872 5873
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5874 5875
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5876
		u32 scontrol;
L
Linus Torvalds 已提交
5877 5878
		int rc;

5879 5880 5881 5882 5883 5884 5885
		/* 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
5886
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5887
		if (rc) {
5888
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5889 5890 5891 5892 5893 5894
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5895

5896
		if (ap->ops->error_handler) {
5897
			struct ata_eh_info *ehi = &ap->eh_info;
5898 5899 5900 5901 5902
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5903
			spin_lock_irqsave(ap->lock, flags);
5904

5905 5906 5907
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5908

5909
			ap->pflags |= ATA_PFLAG_LOADING;
5910 5911
			ata_port_schedule_eh(ap);

5912
			spin_unlock_irqrestore(ap->lock, flags);
5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929

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

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
L
Linus Torvalds 已提交
5930 5931 5932
	}

	/* probes are done, now scan each port's disk(s) */
5933
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5934 5935
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5936

J
Jeff Garzik 已提交
5937
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5938 5939
	}

J
Jeff Garzik 已提交
5940
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5941 5942 5943 5944

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

5945
err_out_free_irq:
J
Jeff Garzik 已提交
5946
	free_irq(ent->irq, host);
L
Linus Torvalds 已提交
5947
err_out:
J
Jeff Garzik 已提交
5948 5949
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5950 5951
		if (ap) {
			ap->ops->port_stop(ap);
J
Jeff Garzik 已提交
5952
			scsi_host_put(ap->scsi_host);
5953
		}
L
Linus Torvalds 已提交
5954
	}
5955

J
Jeff Garzik 已提交
5956
	kfree(host);
L
Linus Torvalds 已提交
5957 5958 5959 5960
	VPRINTK("EXIT, returning 0\n");
	return 0;
}

5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977
/**
 *	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)
5978
		goto skip_eh;
5979 5980

	/* tell EH we're leaving & flush EH */
5981
	spin_lock_irqsave(ap->lock, flags);
5982
	ap->pflags |= ATA_PFLAG_UNLOADING;
5983
	spin_unlock_irqrestore(ap->lock, flags);
5984 5985 5986 5987 5988 5989

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5990
	spin_lock_irqsave(ap->lock, flags);
5991 5992 5993 5994

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

5995
	spin_unlock_irqrestore(ap->lock, flags);
5996 5997 5998 5999 6000

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6001
	spin_lock_irqsave(ap->lock, flags);
6002
	ata_port_freeze(ap);	/* won't be thawed */
6003
	spin_unlock_irqrestore(ap->lock, flags);
6004 6005 6006 6007 6008 6009 6010 6011 6012 6013

	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);

6014
 skip_eh:
6015
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6016
	scsi_remove_host(ap->scsi_host);
6017 6018
}

6019
/**
J
Jeff Garzik 已提交
6020 6021
 *	ata_host_remove - PCI layer callback for device removal
 *	@host: ATA host set that was removed
6022
 *
6023
 *	Unregister all objects associated with this host set. Free those
6024 6025 6026 6027 6028 6029
 *	objects.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */

J
Jeff Garzik 已提交
6030
void ata_host_remove(struct ata_host *host)
6031 6032 6033
{
	unsigned int i;

J
Jeff Garzik 已提交
6034 6035
	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
6036

J
Jeff Garzik 已提交
6037 6038 6039
	free_irq(host->irq, host);
	if (host->irq2)
		free_irq(host->irq2, host);
6040

J
Jeff Garzik 已提交
6041 6042
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6043

J
Jeff Garzik 已提交
6044
		ata_scsi_release(ap->scsi_host);
6045 6046 6047 6048

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

6049 6050 6051 6052 6053
			/* FIXME: Add -ac IDE pci mods to remove these special cases */
			if (ioaddr->cmd_addr == ATA_PRIMARY_CMD)
				release_region(ATA_PRIMARY_CMD, 8);
			else if (ioaddr->cmd_addr == ATA_SECONDARY_CMD)
				release_region(ATA_SECONDARY_CMD, 8);
6054 6055
		}

J
Jeff Garzik 已提交
6056
		scsi_host_put(ap->scsi_host);
6057 6058
	}

J
Jeff Garzik 已提交
6059 6060
	if (host->ops->host_stop)
		host->ops->host_stop(host);
6061

J
Jeff Garzik 已提交
6062
	kfree(host);
6063 6064
}

L
Linus Torvalds 已提交
6065 6066
/**
 *	ata_scsi_release - SCSI layer callback hook for host unload
6067
 *	@shost: libata host to be unloaded
L
Linus Torvalds 已提交
6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078
 *
 *	Performs all duties necessary to shut down a libata port...
 *	Kill port kthread, disable port, and release resources.
 *
 *	LOCKING:
 *	Inherited from SCSI layer.
 *
 *	RETURNS:
 *	One.
 */

J
Jeff Garzik 已提交
6079
int ata_scsi_release(struct Scsi_Host *shost)
L
Linus Torvalds 已提交
6080
{
J
Jeff Garzik 已提交
6081
	struct ata_port *ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
6082 6083 6084 6085

	DPRINTK("ENTER\n");

	ap->ops->port_disable(ap);
6086
	ap->ops->port_stop(ap);
L
Linus Torvalds 已提交
6087 6088 6089 6090 6091

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

6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

	probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
	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
6108
	probe_ent->port_flags = port->flags;
6109 6110 6111 6112
	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;
6113
	probe_ent->private_data = port->private_data;
6114 6115 6116 6117

	return probe_ent;
}

L
Linus Torvalds 已提交
6118 6119 6120
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6121 6122 6123 6124 6125 6126 6127
 *
 *	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
6128
 */
E
Edward Falk 已提交
6129

L
Linus Torvalds 已提交
6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143
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
6144

6145 6146
#ifdef CONFIG_PCI

J
Jeff Garzik 已提交
6147
void ata_pci_host_stop (struct ata_host *host)
6148
{
J
Jeff Garzik 已提交
6149
	struct pci_dev *pdev = to_pci_dev(host->dev);
6150

J
Jeff Garzik 已提交
6151
	pci_iounmap(pdev, host->mmio_base);
6152 6153
}

L
Linus Torvalds 已提交
6154 6155 6156 6157 6158
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
 *	PCI layer indicates to libata via this hook that
R
Randy Dunlap 已提交
6159
 *	hot-unplug or module unload event has occurred.
L
Linus Torvalds 已提交
6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170
 *	Handle this by unregistering all objects associated
 *	with this PCI device.  Free those objects.  Then finally
 *	release PCI resources and disable device.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */

void ata_pci_remove_one (struct pci_dev *pdev)
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6171
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6172

J
Jeff Garzik 已提交
6173
	ata_host_remove(host);
6174

L
Linus Torvalds 已提交
6175 6176 6177 6178 6179 6180
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	dev_set_drvdata(dev, NULL);
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6181
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212
{
	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
6213

6214
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6215 6216
{
	pci_save_state(pdev);
6217

6218
	if (mesg.event == PM_EVENT_SUSPEND) {
6219 6220 6221
		pci_disable_device(pdev);
		pci_set_power_state(pdev, PCI_D3hot);
	}
J
Jens Axboe 已提交
6222 6223
}

6224
void ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6225 6226 6227 6228 6229
{
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	pci_enable_device(pdev);
	pci_set_master(pdev);
6230 6231
}

6232
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6233
{
J
Jeff Garzik 已提交
6234
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6235 6236
	int rc = 0;

J
Jeff Garzik 已提交
6237
	rc = ata_host_suspend(host, mesg);
6238 6239 6240
	if (rc)
		return rc;

6241
	ata_pci_device_do_suspend(pdev, mesg);
6242 6243 6244 6245 6246 6247

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6248
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6249 6250

	ata_pci_device_do_resume(pdev);
J
Jeff Garzik 已提交
6251
	ata_host_resume(host);
J
Jens Axboe 已提交
6252 6253
	return 0;
}
L
Linus Torvalds 已提交
6254 6255 6256 6257 6258
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6259
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6260 6261 6262 6263
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6264 6265 6266 6267 6268 6269
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6270 6271 6272 6273 6274 6275 6276
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6277
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6278 6279
}

6280
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6281 6282
module_exit(ata_exit);

6283
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6284
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303

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;
}

6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349
/**
 *	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
6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382
/*
 * 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
6383 6384 6385 6386 6387 6388 6389
/*
 * 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.
 */

6390 6391 6392
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
6393
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6394 6395
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6396
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6397
EXPORT_SYMBOL_GPL(ata_device_add);
6398
EXPORT_SYMBOL_GPL(ata_port_detach);
J
Jeff Garzik 已提交
6399
EXPORT_SYMBOL_GPL(ata_host_remove);
L
Linus Torvalds 已提交
6400 6401
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6402
EXPORT_SYMBOL_GPL(ata_hsm_move);
6403
EXPORT_SYMBOL_GPL(ata_qc_complete);
6404
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416
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_port_stop);
J
Jeff Garzik 已提交
6417
EXPORT_SYMBOL_GPL(ata_host_stop);
L
Linus Torvalds 已提交
6418
EXPORT_SYMBOL_GPL(ata_interrupt);
6419 6420
EXPORT_SYMBOL_GPL(ata_mmio_data_xfer);
EXPORT_SYMBOL_GPL(ata_pio_data_xfer);
6421
EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq);
L
Linus Torvalds 已提交
6422
EXPORT_SYMBOL_GPL(ata_qc_prep);
6423
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6424 6425 6426 6427 6428
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);
6429 6430 6431 6432 6433
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
6434
EXPORT_SYMBOL_GPL(ata_port_probe);
6435
EXPORT_SYMBOL_GPL(sata_set_spd);
6436 6437
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6438 6439 6440
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6441
EXPORT_SYMBOL_GPL(ata_std_prereset);
6442
EXPORT_SYMBOL_GPL(ata_std_softreset);
6443
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6444 6445
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6446 6447
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6448
EXPORT_SYMBOL_GPL(ata_port_disable);
6449
EXPORT_SYMBOL_GPL(ata_ratelimit);
6450
EXPORT_SYMBOL_GPL(ata_wait_register);
6451
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6452
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6453 6454 6455
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6456
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6457
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6458 6459
EXPORT_SYMBOL_GPL(ata_scsi_release);
EXPORT_SYMBOL_GPL(ata_host_intr);
6460 6461 6462 6463 6464 6465
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
6466 6467
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6468 6469
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6470
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6471 6472
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6473
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6474 6475 6476
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6477 6478
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6479
EXPORT_SYMBOL_GPL(ata_pci_host_stop);
L
Linus Torvalds 已提交
6480 6481 6482
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6483 6484
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6485 6486
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
Alan Cox 已提交
6487 6488
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6489
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6490 6491 6492

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6493 6494

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6495 6496
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6497 6498 6499
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6500 6501
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
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EXPORT_SYMBOL_GPL(ata_do_eh);