libata-core.c 155.3 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/jiffies.h>
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#include <linux/scatterlist.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>

#include "libata.h"

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#define DRV_VERSION	"2.10"	/* must be exactly four chars */


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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
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static unsigned int ata_print_id = 1;
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static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@fis: Buffer into which data will output
 *	@pmp: Port multiplier port
 *
 *	Converts a standard ATA taskfile to a Serial ATA
 *	FIS structure (Register - Host to Device).
 *
 *	LOCKING:
 *	Inherited from caller.
 */

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void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
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{
	fis[0] = 0x27;	/* Register - Host to Device FIS */
	fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
					    bit 7 indicates Command FIS */
	fis[2] = tf->command;
	fis[3] = tf->feature;

	fis[4] = tf->lbal;
	fis[5] = tf->lbam;
	fis[6] = tf->lbah;
	fis[7] = tf->device;

	fis[8] = tf->hob_lbal;
	fis[9] = tf->hob_lbam;
	fis[10] = tf->hob_lbah;
	fis[11] = tf->hob_feature;

	fis[12] = tf->nsect;
	fis[13] = tf->hob_nsect;
	fis[14] = 0;
	fis[15] = tf->ctl;

	fis[16] = 0;
	fis[17] = 0;
	fis[18] = 0;
	fis[19] = 0;
}

/**
 *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
 *	@fis: Buffer from which data will be input
 *	@tf: Taskfile to output
 *
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 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
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 *
 *	LOCKING:
 *	Inherited from caller.
 */

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void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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{
	tf->command	= fis[2];	/* status */
	tf->feature	= fis[3];	/* error */

	tf->lbal	= fis[4];
	tf->lbam	= fis[5];
	tf->lbah	= fis[6];
	tf->device	= fis[7];

	tf->hob_lbal	= fis[8];
	tf->hob_lbam	= fis[9];
	tf->hob_lbah	= fis[10];

	tf->nsect	= fis[12];
	tf->hob_nsect	= fis[13];
}

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static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
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	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
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	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
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	0,
	0,
	0,
	0,
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	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
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	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
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};
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/**
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 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
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 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
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 *	Examine the device configuration and tf->flags to calculate
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 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
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static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
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{
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	u8 cmd;
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	int index, fua, lba48, write;
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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
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	}
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	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
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}

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
693
 *	@r_err: Value of error register on completion
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
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 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

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unsigned int
712
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
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{
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

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

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

	ap->ops->tf_read(ap, &tf);
723
	err = tf.feature;
724 725
	if (r_err)
		*r_err = err;
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727 728 729 730 731
	/* see if device passed diags: if master then continue and warn later */
	if (err == 0 && device == 0)
		/* diagnostic fail : do nothing _YET_ */
		ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
	else if (err == 1)
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		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
736
		return ATA_DEV_NONE;
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738
	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
740

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	if (class == ATA_DEV_UNKNOWN)
742
		return ATA_DEV_NONE;
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	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
744 745
		return ATA_DEV_NONE;
	return class;
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}

/**
749
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an even number.
 *
 *	The strings in the IDENTIFY DEVICE page are broken up into
 *	16-bit chunks.  Run through the string, and output each
 *	8-bit chunk linearly, regardless of platform.
 *
 *	LOCKING:
 *	caller.
 */

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

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

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

		ofs++;
		len -= 2;
	}
}

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

	WARN_ON(!(len & 1));

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

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

826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
 *	@mode: mode to assume if we cannot tell
 *
 *	Set up the timing values for the device based upon the identify
 *	reported values for the DMA mode. This function is used by drivers
 *	which rely upon firmware configured modes, but wish to report the
 *	mode correctly when possible.
 *
 *	In addition we emit similarly formatted messages to the default
 *	ata_dev_set_mode handler, in order to provide consistency of
 *	presentation.
 */

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

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

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

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

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

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

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

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

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

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	iowrite8(tmp, ap->ioaddr.device_addr);
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	ata_pause(ap);		/* needed; also flushes, for mmio */
}

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

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
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	if (ata_msg_probe(ap))
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		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
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	if (wait)
		ata_wait_idle(ap);

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
953
 *	@id: IDENTIFY DEVICE page to dump
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 *
955 956
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

962
static inline void ata_dump_id(const u16 *id)
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{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
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		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
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		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
986 987
		id[88],
		id[93]);
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}

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/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
static unsigned int ata_id_xfermask(const u16 *id)
{
	unsigned int pio_mask, mwdma_mask, udma_mask;

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

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

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1034

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

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

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

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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

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

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

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

	DPRINTK("ENTER\n");

1111
	spin_lock_irqsave(ap->lock, flags);
1112
	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
1113
	spin_unlock_irqrestore(ap->lock, flags);
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	DPRINTK("flush #1\n");
	flush_workqueue(ata_wq);

	/*
	 * At this point, if a task is running, it's guaranteed to see
	 * the FLUSH flag; thus, it will never queue pio tasks again.
	 * Cancel and flush.
	 */
	if (!cancel_delayed_work(&ap->port_task)) {
1124
		if (ata_msg_ctl(ap))
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			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
					__FUNCTION__);
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		flush_workqueue(ata_wq);
	}

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

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

	complete(waiting);
}

/**
1146
 *	ata_exec_internal_sg - execute libata internal command
1147 1148
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1149
 *	@cdb: CDB for packet command
1150
 *	@dma_dir: Data tranfer direction of the command
1151 1152
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1153 1154 1155 1156 1157 1158 1159 1160 1161
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1162 1163 1164
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1165
 */
1166 1167 1168 1169
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
			      int dma_dir, struct scatterlist *sg,
			      unsigned int n_elem)
1170
{
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	struct ata_port *ap = dev->ap;
1172 1173
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1174
	unsigned int tag, preempted_tag;
1175
	u32 preempted_sactive, preempted_qc_active;
1176
	DECLARE_COMPLETION_ONSTACK(wait);
1177
	unsigned long flags;
1178
	unsigned int err_mask;
1179
	int rc;
1180

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

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

1189
	/* initialize internal qc */
1190

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

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

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

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

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

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

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

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

1237
	ata_qc_issue(qc);
1238

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

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

	ata_port_flush_task(ap);
1244

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

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

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

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

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

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

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

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

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

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

1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1303
	if (ap->flags & ATA_FLAG_DISABLED) {
1304 1305 1306 1307
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

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

1310
	return err_mask;
1311 1312
}

1313
/**
1314
 *	ata_exec_internal - execute libata internal command
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
			   int dma_dir, void *buf, unsigned int buflen)
{
1335 1336
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1337

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

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

1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1361
 */
1362
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1363 1364 1365 1366 1367 1368 1369 1370 1371
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1468

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

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

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

1485
	/* sanity check */
1486 1487 1488 1489 1490 1491 1492 1493 1494
	rc = -EINVAL;
	reason = "device reports illegal type";

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1495 1496
	}

1497
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1498 1499 1500 1501 1502 1503 1504 1505 1506
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
		 * IDENTIFY
		 * INITIALIZE DEVICE PARAMETERS
		 * anything else..
		 * Some drives were very specific about that exact sequence.
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1507
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1508 1509 1510 1511 1512 1513 1514 1515 1516
			if (err_mask) {
				rc = -EIO;
				reason = "INIT_DEV_PARAMS failed";
				goto err_out;
			}

			/* current CHS translation info (id[53-58]) might be
			 * changed. reread the identify device info.
			 */
1517
			flags &= ~ATA_READID_POSTRESET;
1518 1519 1520 1521 1522
			goto retry;
		}
	}

	*p_class = class;
1523

1524 1525 1526
	return 0;

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

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

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
	struct ata_port *ap = dev->ap;
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
1548 1549 1550 1551
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1552
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1553
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1554 1555 1556 1557 1558 1559 1560 1561 1562
		dev->flags |= ATA_DFLAG_NCQ;
	}

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

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

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

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

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

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

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

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

1610 1611 1612 1613 1614 1615 1616 1617 1618 1619
	/* set _SDD */
	rc = ata_acpi_push_id(ap, dev->devno);
	if (rc) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set _SDD(%d)\n",
			rc);
	}

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

1620
	/* print device capabilities */
1621
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1622 1623 1624
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
1625
			       __FUNCTION__,
1626 1627
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1628

1629
	/* initialize to-be-configured parameters */
1630
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1631 1632 1633 1634 1635 1636 1637
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
1638 1639 1640 1641
	/*
	 * common ATA, ATAPI feature tests
	 */

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

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

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

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

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

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

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

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

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

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

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

1690
			/* print device info to dmesg */
1691 1692 1693 1694 1695 1696 1697
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
1698
					(unsigned long long)dev->n_sectors,
1699 1700
					dev->multi_count, lba_desc, ncq_desc);
			}
1701
		} else {
1702 1703 1704
			/* CHS */

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

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

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

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

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

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

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

L
Linus Torvalds 已提交
1752
		/* print device info to dmesg */
1753
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1754 1755 1756
			ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1757 1758
	}

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

1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
		/* Let the user know. We don't want to disallow opens for
		   rescue purposes, or in case the vendor is just a blithering
		   idiot */
                if (print_info) {
			ata_dev_printk(dev, KERN_WARNING,
"Drive reports diagnostics failure. This may indicate a drive\n");
			ata_dev_printk(dev, KERN_WARNING,
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

1776
	ata_set_port_max_cmd_len(ap);
1777

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

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

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

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

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1806 1807 1808 1809
 *	Master ATA bus probing function.  Initiates a hardware-dependent
 *	bus reset, then attempts to identify any devices found on
 *	the bus.
 *
L
Linus Torvalds 已提交
1810
 *	LOCKING:
J
Jeff Garzik 已提交
1811
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1812 1813
 *
 *	RETURNS:
1814
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1815 1816
 */

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

1824
	ata_port_probe(ap);
1825

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

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

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

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

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

1845
	ata_port_probe(ap);
1846

A
Alan Cox 已提交
1847 1848 1849 1850 1851 1852
	/* after the reset the device state is PIO 0 and the controller
	   state is undefined. Record the mode */

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

1853
	/* read IDENTIFY page and configure devices */
L
Linus Torvalds 已提交
1854
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1855
		dev = &ap->device[i];
1856

1857 1858
		if (tries[i])
			dev->class = classes[i];
1859

1860
		if (!ata_dev_enabled(dev))
1861 1862
			continue;

1863 1864
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1865 1866 1867
		if (rc)
			goto fail;

1868 1869 1870
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1871 1872
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1873 1874
	}

1875
	/* configure transfer mode */
1876
	rc = ata_set_mode(ap, &dev);
1877
	if (rc)
1878
		goto fail;
L
Linus Torvalds 已提交
1879

1880 1881 1882
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1883

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

 fail:
1890 1891
	tries[dev->devno]--;

1892 1893
	switch (rc) {
	case -EINVAL:
1894
		/* eeek, something went very wrong, give up */
1895 1896
		tries[dev->devno] = 0;
		break;
1897 1898 1899 1900

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
1901
	case -EIO:
1902 1903 1904 1905 1906 1907 1908
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
			sata_down_spd_limit(ap);
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
1909 1910
	}

1911
	if (!tries[dev->devno])
T
Tejun Heo 已提交
1912
		ata_dev_disable(dev);
1913

1914
	goto retry;
L
Linus Torvalds 已提交
1915 1916 1917
}

/**
J
Jeff Garzik 已提交
1918 1919
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1920
 *
J
Jeff Garzik 已提交
1921 1922 1923
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1924
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1925
 *	serialization.
L
Linus Torvalds 已提交
1926 1927 1928 1929
 */

void ata_port_probe(struct ata_port *ap)
{
1930
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1931 1932
}

1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
/**
 *	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)
{
1944
	u32 sstatus, scontrol, tmp;
1945

1946
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1947
		return;
1948
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1949

1950
	if (ata_port_online(ap)) {
1951
		tmp = (sstatus >> 4) & 0xf;
1952 1953 1954
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1955
	} else {
1956 1957 1958
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1959 1960 1961
	}
}

L
Linus Torvalds 已提交
1962
/**
J
Jeff Garzik 已提交
1963 1964
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1965
 *
J
Jeff Garzik 已提交
1966 1967 1968
 *	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
1969 1970
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1971
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1972 1973 1974 1975 1976 1977 1978 1979
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1980
		/* issue phy wake/reset */
1981
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1982 1983 1984
		/* 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
1985
	}
1986 1987
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1988 1989 1990 1991

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1992
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1993 1994 1995 1996
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1997 1998
	/* print link status */
	sata_print_link_status(ap);
1999

2000
	/* TODO: phy layer with polling, timeouts, etc. */
2001
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2002
		ata_port_probe(ap);
2003
	else
L
Linus Torvalds 已提交
2004 2005
		ata_port_disable(ap);

2006
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
		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
2018 2019
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2020
 *
J
Jeff Garzik 已提交
2021 2022
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2023 2024
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2025
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2026 2027 2028 2029 2030
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2031
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2032 2033 2034 2035
		return;
	ata_bus_reset(ap);
}

2036 2037 2038 2039 2040 2041 2042
/**
 *	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
 */
2043

T
Tejun Heo 已提交
2044
struct ata_device *ata_dev_pair(struct ata_device *adev)
2045
{
T
Tejun Heo 已提交
2046
	struct ata_port *ap = adev->ap;
2047
	struct ata_device *pair = &ap->device[1 - adev->devno];
2048
	if (!ata_dev_enabled(pair))
2049 2050 2051 2052
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2053
/**
J
Jeff Garzik 已提交
2054 2055
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2056
 *
J
Jeff Garzik 已提交
2057 2058 2059 2060 2061
 *	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
2062
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2063
 *	serialization.
L
Linus Torvalds 已提交
2064 2065 2066 2067 2068 2069
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2070
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2071 2072
}

2073
/**
2074
 *	sata_down_spd_limit - adjust SATA spd limit downward
2075 2076 2077 2078
 *	@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
2079
 *	using sata_set_spd().
2080 2081 2082 2083 2084 2085 2086
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2087
int sata_down_spd_limit(struct ata_port *ap)
2088
{
2089 2090
	u32 sstatus, spd, mask;
	int rc, highbit;
2091

2092 2093 2094
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2095 2096 2097 2098 2099 2100 2101

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

2102
	spd = (sstatus >> 4) & 0xf;
2103 2104 2105 2106 2107 2108 2109 2110 2111
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2112 2113
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2114 2115 2116 2117

	return 0;
}

2118
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133
{
	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;
}

/**
2134
 *	sata_set_spd_needed - is SATA spd configuration needed
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147
 *	@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.
 */
2148
int sata_set_spd_needed(struct ata_port *ap)
2149 2150 2151
{
	u32 scontrol;

2152
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2153 2154
		return 0;

2155
	return __sata_set_spd_needed(ap, &scontrol);
2156 2157 2158
}

/**
2159
 *	sata_set_spd - set SATA spd according to spd limit
2160 2161 2162 2163 2164 2165 2166 2167 2168
 *	@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
2169
 *	changed.  Negative errno if SCR registers are inaccessible.
2170
 */
2171
int sata_set_spd(struct ata_port *ap)
2172 2173
{
	u32 scontrol;
2174
	int rc;
2175

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

2179
	if (!__sata_set_spd_needed(ap, &scontrol))
2180 2181
		return 0;

2182 2183 2184
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2185 2186 2187
	return 1;
}

A
Alan Cox 已提交
2188 2189 2190 2191 2192
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2193
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2194
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2195 2196 2197
 * 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
2198 2199 2200 2201 2202 2203 2204 2205 2206
 */

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 },

2207 2208
	{ 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
2209 2210 2211 2212 2213
	{ 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 }, */
2214

A
Alan Cox 已提交
2215 2216 2217
	{ 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 },
2218

A
Alan Cox 已提交
2219 2220 2221 2222
	{ 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 },

2223 2224
	{ 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
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 2264 2265 2266 2267 2268 2269
	{ 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
2270
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2271
			return NULL;
2272
	return t;
A
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2273 2274 2275 2276 2277 2278 2279 2280 2281
}

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;

	/*
2282
	 * Find the mode.
2283
	 */
A
Alan Cox 已提交
2284 2285 2286 2287

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

2288 2289
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309
	/*
	 * 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.
	 */

2310
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2311 2312

	/*
2313 2314 2315
	 * 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
2316 2317
	 */

2318
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2319 2320 2321 2322 2323
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2324
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
	 */

	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;
}

2340 2341 2342
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2343
 *	@sel: ATA_DNXFER_* selector
2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354
 *
 *	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
 */
2355
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2356
{
2357 2358 2359 2360
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2361

2362 2363
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2364

2365 2366 2367 2368
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2369

2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

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

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

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

	default:
		BUG();
	}

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

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

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

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
2422 2423 2424 2425 2426 2427 2428

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

	return 0;
}

T
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2429
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2430
{
2431
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2432 2433
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2434

2435
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2436 2437 2438
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2439
	err_mask = ata_dev_set_xfermode(dev);
2440 2441 2442 2443
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
        	err_mask &= ~AC_ERR_DEV;

2444
	if (err_mask) {
2445 2446
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2447 2448
		return -EIO;
	}
L
Linus Torvalds 已提交
2449

2450
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2451
	rc = ata_dev_revalidate(dev, 0);
2452
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2453
	if (rc)
2454
		return rc;
2455

2456 2457
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2458

2459 2460
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2461
	return 0;
L
Linus Torvalds 已提交
2462 2463 2464 2465 2466
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2467
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2468
 *
2469 2470 2471
 *	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
2472
 *
L
Linus Torvalds 已提交
2473
 *	LOCKING:
J
Jeff Garzik 已提交
2474
 *	PCI/etc. bus probe sem.
2475 2476 2477
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2478
 */
2479
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2480
{
2481
	struct ata_device *dev;
2482
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2483

2484
	/* has private set_mode? */
A
Alan 已提交
2485 2486
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2487

2488 2489
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2490
		unsigned int pio_mask, dma_mask;
2491

2492 2493
		dev = &ap->device[i];

2494
		if (!ata_dev_enabled(dev))
2495 2496
			continue;

T
Tejun Heo 已提交
2497
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2498

2499 2500 2501 2502
		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);
2503

2504
		found = 1;
2505 2506
		if (dev->dma_mode)
			used_dma = 1;
2507
	}
2508
	if (!found)
2509
		goto out;
2510 2511

	/* step 2: always set host PIO timings */
2512 2513 2514 2515 2516 2517
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2518
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2519
			rc = -EINVAL;
2520
			goto out;
2521 2522 2523 2524 2525 2526 2527
		}

		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
2528

2529
	/* step 3: set host DMA timings */
2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540
	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
2541 2542

	/* step 4: update devices' xfer mode */
2543
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2544
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2545

A
Alan 已提交
2546
		/* don't update suspended devices' xfer mode */
2547
		if (!ata_dev_ready(dev))
2548 2549
			continue;

T
Tejun Heo 已提交
2550
		rc = ata_dev_set_mode(dev);
2551
		if (rc)
2552
			goto out;
2553
	}
L
Linus Torvalds 已提交
2554

2555 2556
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2557
	 */
J
Jeff Garzik 已提交
2558 2559
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
		ap->host->simplex_claimed = 1;
2560

2561
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2562 2563 2564
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

2565 2566 2567 2568
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2569 2570
}

2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
/**
 *	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
2581
 *	spin_lock_irqsave(host lock)
2582 2583 2584 2585 2586 2587 2588 2589 2590
 */

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
2591 2592 2593 2594 2595 2596
/**
 *	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
2597 2598 2599
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2600 2601 2602 2603 2604
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2605
 */
2606 2607
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2608 2609 2610 2611 2612 2613 2614
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2615 2616
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2617 2618 2619 2620
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2621
	if (status != 0xff && (status & ATA_BUSY))
2622
		ata_port_printk(ap, KERN_WARNING,
2623 2624
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2625 2626

	timeout = timer_start + tmout;
2627 2628
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2629 2630 2631 2632
		msleep(50);
		status = ata_chk_status(ap);
	}

2633 2634 2635
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2636
	if (status & ATA_BUSY) {
2637
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2638 2639
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2640
		return -EBUSY;
L
Linus Torvalds 已提交
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
	}

	return 0;
}

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

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

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

		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
2667 2668
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

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

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

T
Tejun Heo 已提交
2693
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
2694 2695

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2696 2697 2698 2699 2700
	iowrite8(ap->ctl, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2701 2702 2703 2704 2705 2706 2707 2708

	/* 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.
2709 2710
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2711 2712 2713
	 */
	msleep(150);

2714
	/* Before we perform post reset processing we want to see if
2715 2716 2717
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2718 2719
	if (ata_check_status(ap) == 0xFF)
		return 0;
2720

L
Linus Torvalds 已提交
2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738
	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
2739
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2740
 *	Obtains host lock.
L
Linus Torvalds 已提交
2741 2742
 *
 *	SIDE EFFECTS:
2743
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2744 2745 2746 2747 2748 2749 2750
 */

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
2751
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2752

T
Tejun Heo 已提交
2753
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773

	/* 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
2774 2775
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2776 2777 2778 2779

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2780
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2781
	if ((slave_possible) && (err != 0x81))
2782
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2783 2784

	/* re-enable interrupts */
2785
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799

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

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

	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
		/* set up device control for ATA_FLAG_SATA_RESET */
T
Tejun Heo 已提交
2800
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2801 2802 2803 2804 2805 2806
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2807
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2808 2809 2810 2811 2812
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831
/**
 *	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)
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 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887
	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;
2888 2889 2890 2891
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2892

2893
	scontrol = (scontrol & 0x0f0) | 0x300;
2894 2895 2896

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2897

2898 2899 2900 2901
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2902

2903
	return sata_phy_debounce(ap, params);
2904 2905
}

2906 2907 2908 2909 2910 2911 2912 2913
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) {
2914
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949

		/* 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;
2950
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2951 2952
	int rc;

2953 2954 2955 2956 2957 2958 2959 2960
	/* 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);
2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985

	/* 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;
}

2986 2987 2988 2989 2990
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2991
 *	Reset host port using ATA SRST.
2992 2993 2994 2995 2996 2997 2998
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2999
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
3000 3001 3002 3003 3004 3005 3006
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

3007
	if (ata_port_offline(ap)) {
3008 3009 3010 3011
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
	/* 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) {
3025 3026
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
3027 3028 3029 3030 3031 3032 3033 3034
		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);

3035
 out:
3036 3037 3038 3039 3040
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3041
 *	sata_port_hardreset - reset port via SATA phy reset
3042
 *	@ap: port to reset
3043
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3044 3045 3046 3047 3048 3049 3050 3051 3052
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3053
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3054
{
3055
	u32 scontrol;
3056
	int rc;
3057

3058 3059
	DPRINTK("ENTER\n");

3060
	if (sata_set_spd_needed(ap)) {
3061 3062 3063 3064 3065
		/* 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.
		 */
3066
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3067
			goto out;
3068

3069
		scontrol = (scontrol & 0x0f0) | 0x304;
3070 3071

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3072
			goto out;
3073

3074
		sata_set_spd(ap);
3075 3076 3077
	}

	/* issue phy wake/reset */
3078
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3079
		goto out;
3080

3081
	scontrol = (scontrol & 0x0f0) | 0x301;
3082 3083

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3084
		goto out;
3085

3086
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3087 3088 3089 3090
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3091
	/* bring phy back */
3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125
	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;
	}
3126 3127

	/* TODO: phy layer with polling, timeouts, etc. */
3128
	if (ata_port_offline(ap)) {
3129 3130 3131 3132 3133
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3134 3135 3136
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3137
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3138 3139
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3140 3141 3142
		return -EIO;
	}

3143 3144
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164
	*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)
{
3165 3166
	u32 serror;

3167 3168 3169
	DPRINTK("ENTER\n");

	/* print link status */
3170
	sata_print_link_status(ap);
3171

3172 3173 3174 3175
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3176
	/* re-enable interrupts */
3177 3178
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3179 3180 3181 3182 3183 3184 3185

	/* 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);

3186 3187 3188 3189 3190 3191 3192
	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		DPRINTK("EXIT, no device\n");
		return;
	}

	/* set up device control */
T
Tejun Heo 已提交
3193 3194
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3195 3196 3197 3198

	DPRINTK("EXIT\n");
}

3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214
/**
 *	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
3215 3216
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3217 3218
{
	const u16 *old_id = dev->id;
3219 3220
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3221 3222 3223
	u64 new_n_sectors;

	if (dev->class != new_class) {
3224 3225
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3226 3227 3228
		return 0;
	}

3229 3230 3231 3232
	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3233 3234 3235
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3236 3237
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3238 3239 3240 3241
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3242 3243
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3244 3245 3246 3247
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3248 3249 3250 3251
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3252 3253 3254 3255 3256 3257 3258 3259 3260
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3261
 *	@readid_flags: read ID flags
3262 3263 3264 3265 3266 3267 3268 3269 3270 3271
 *
 *	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
 */
3272
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3273
{
3274
	unsigned int class = dev->class;
3275
	u16 *id = (void *)dev->ap->sector_buf;
3276 3277
	int rc;

3278 3279 3280 3281
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3282

3283
	/* read ID data */
3284
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3285 3286 3287 3288
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3289
	if (!ata_dev_same_device(dev, class, id)) {
3290 3291 3292 3293
		rc = -ENODEV;
		goto fail;
	}

3294
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3295 3296

	/* configure device according to the new ID */
3297
	rc = ata_dev_configure(dev);
3298 3299
	if (rc == 0)
		return 0;
3300 3301

 fail:
3302
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3303 3304 3305
	return rc;
}

3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

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

	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3354
};
3355

3356
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3357
{
T
Tejun Heo 已提交
3358 3359
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3360
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3361

T
Tejun Heo 已提交
3362 3363
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
3364

3365
	while (ad->model_num) {
T
Tejun Heo 已提交
3366
		if (!strcmp(ad->model_num, model_num)) {
3367 3368
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3369
			if (!strcmp(ad->model_rev, model_rev))
3370
				return ad->horkage;
3371
		}
3372
		ad++;
3373
	}
L
Linus Torvalds 已提交
3374 3375 3376
	return 0;
}

3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388
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;
}

3389 3390 3391 3392
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3393 3394 3395 3396
 *	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...
3397 3398 3399 3400
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3401
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3402
{
T
Tejun Heo 已提交
3403
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3404
	struct ata_host *host = ap->host;
3405
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3406

3407
	/* controller modes available */
3408 3409 3410 3411 3412 3413 3414 3415
	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);
3416 3417 3418 3419 3420 3421 3422
	/* 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
3423

3424 3425 3426
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3427

3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438
	/*
	 *	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));
	}

3439 3440
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3441 3442
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3443
	}
3444

J
Jeff Garzik 已提交
3445
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
3446 3447 3448
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3449
	}
3450

3451 3452 3453
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3454 3455
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3456 3457 3458 3459 3460 3461
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3462 3463 3464
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3465
 *	LOCKING:
J
Jeff Garzik 已提交
3466
 *	PCI/etc. bus probe sem.
3467 3468 3469
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3470 3471
 */

T
Tejun Heo 已提交
3472
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3473
{
3474
	struct ata_taskfile tf;
3475
	unsigned int err_mask;
L
Linus Torvalds 已提交
3476 3477 3478 3479

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

T
Tejun Heo 已提交
3480
	ata_tf_init(dev, &tf);
3481 3482 3483 3484 3485
	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
3486

T
Tejun Heo 已提交
3487
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3488

3489 3490
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3491 3492
}

3493 3494 3495
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3496 3497
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3498 3499
 *
 *	LOCKING:
3500 3501 3502 3503
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3504
 */
T
Tejun Heo 已提交
3505 3506
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3507
{
3508
	struct ata_taskfile tf;
3509
	unsigned int err_mask;
3510 3511 3512

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3513
		return AC_ERR_INVALID;
3514 3515 3516 3517

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

T
Tejun Heo 已提交
3518
	ata_tf_init(dev, &tf);
3519 3520 3521 3522 3523
	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 */
3524

T
Tejun Heo 已提交
3525
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3526

3527 3528
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3529 3530
}

L
Linus Torvalds 已提交
3531
/**
J
Jeff Garzik 已提交
3532 3533 3534 3535
 *	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
3536 3537
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3538
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3539
 */
3540
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3541 3542
{
	struct ata_port *ap = qc->ap;
3543
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3544
	int dir = qc->dma_dir;
3545
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3546

3547 3548
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3549 3550

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3551
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3552

J
Jeff Garzik 已提交
3553
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3554

3555 3556 3557 3558 3559 3560 3561 3562
	/* 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) {
3563
		if (qc->n_elem)
3564
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3565 3566 3567 3568 3569 3570
		/* 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);
3571
			kunmap_atomic(addr, KM_IRQ0);
3572 3573
		}
	} else {
3574
		if (qc->n_elem)
3575
			dma_unmap_single(ap->dev,
3576 3577
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3578 3579 3580 3581 3582 3583
		/* 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
3584 3585

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3586
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3587 3588 3589 3590 3591 3592
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3593 3594 3595
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3596
 *	LOCKING:
J
Jeff Garzik 已提交
3597
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3598 3599 3600 3601 3602
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3603 3604
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3605

3606
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3607
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3608 3609

	idx = 0;
3610
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
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 3641 3642 3643
		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
3644 3645 3646 3647
 *	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
3648
 *	LOCKING:
J
Jeff Garzik 已提交
3649
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3650
 *
L
Linus Torvalds 已提交
3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667
 *	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
3668 3669
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3670
 *	LOCKING:
J
Jeff Garzik 已提交
3671
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3672 3673 3674 3675 3676 3677 3678 3679 3680
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3681 3682
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3683 3684 3685 3686 3687 3688 3689 3690 3691 3692
/**
 *	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
3693
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3694 3695
 */

L
Linus Torvalds 已提交
3696 3697 3698 3699
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3700
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3701
	qc->n_elem = 1;
3702
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3703
	qc->buf_virt = buf;
3704
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3705

3706
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3707 3708
}

J
Jeff Garzik 已提交
3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719
/**
 *	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
3720
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3721 3722
 */

L
Linus Torvalds 已提交
3723 3724 3725 3726
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3727
	qc->__sg = sg;
L
Linus Torvalds 已提交
3728
	qc->n_elem = n_elem;
3729
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3730 3731 3732
}

/**
J
Jeff Garzik 已提交
3733 3734 3735 3736
 *	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
3737 3738
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3739
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3740 3741
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3742
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3743 3744 3745 3746 3747 3748
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3749
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3750
	dma_addr_t dma_address;
3751
	int trim_sg = 0;
L
Linus Torvalds 已提交
3752

3753 3754 3755 3756 3757 3758
	/* 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;

3759
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770

		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;
3771 3772
		if (sg->length == 0)
			trim_sg = 1;
3773 3774 3775 3776 3777

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

3778 3779
	if (trim_sg) {
		qc->n_elem--;
3780 3781 3782
		goto skip_map;
	}

3783
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3784
				     sg->length, dir);
3785 3786 3787
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3788
		return -1;
3789
	}
L
Linus Torvalds 已提交
3790 3791

	sg_dma_address(sg) = dma_address;
3792
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3793

3794
skip_map:
L
Linus Torvalds 已提交
3795 3796 3797 3798 3799 3800 3801
	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
3802 3803 3804 3805
 *	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
3806 3807
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3808
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3809 3810
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3811
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3812 3813 3814 3815 3816 3817
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3818 3819
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3820
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3821

T
Tejun Heo 已提交
3822
	VPRINTK("ENTER, ata%u\n", ap->print_id);
3823
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3824

3825 3826 3827 3828 3829 3830 3831
	/* 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;

3832
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846

		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);
3847
			kunmap_atomic(addr, KM_IRQ0);
3848 3849 3850 3851 3852 3853
		}

		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;
3854 3855
		if (lsg->length == 0)
			trim_sg = 1;
3856 3857 3858 3859 3860

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

3861 3862 3863 3864 3865 3866 3867 3868 3869
	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
3870
	dir = qc->dma_dir;
3871
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3872 3873 3874
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3875
		return -1;
3876
	}
L
Linus Torvalds 已提交
3877 3878 3879

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

3880
skip_map:
L
Linus Torvalds 已提交
3881 3882 3883 3884 3885
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3886
/**
3887
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3888 3889 3890 3891 3892 3893 3894 3895
 *	@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
3896
 *	Inherited from caller.
E
Edward Falk 已提交
3897
 */
L
Linus Torvalds 已提交
3898 3899 3900 3901 3902 3903 3904 3905 3906 3907
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
3908
/**
T
Tejun Heo 已提交
3909
 *	ata_data_xfer - Transfer data by PIO
3910
 *	@adev: device to target
A
Albert Lee 已提交
3911 3912
 *	@buf: data buffer
 *	@buflen: buffer length
3913
 *	@write_data: read/write
A
Albert Lee 已提交
3914 3915 3916 3917 3918 3919
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3920 3921
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3922
{
3923
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3924
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3925

A
Albert Lee 已提交
3926
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3927
	if (write_data)
T
Tejun Heo 已提交
3928
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3929
	else
T
Tejun Heo 已提交
3930
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
3931 3932 3933 3934 3935 3936 3937 3938

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

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
T
Tejun Heo 已提交
3939
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
3940
		} else {
T
Tejun Heo 已提交
3941
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
3942 3943 3944
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3945 3946
}

3947
/**
T
Tejun Heo 已提交
3948
 *	ata_data_xfer_noirq - Transfer data by PIO
3949 3950 3951 3952 3953
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3954
 *	Transfer data from/to the device data register by PIO. Do the
3955 3956 3957 3958 3959
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3960 3961
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
3962 3963 3964
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
3965
	ata_data_xfer(adev, buf, buflen, write_data);
3966 3967 3968 3969
	local_irq_restore(flags);
}


A
Albert Lee 已提交
3970 3971 3972 3973 3974 3975 3976 3977 3978 3979
/**
 *	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
3980 3981 3982
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3983
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3984 3985 3986 3987 3988
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
3989
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
3990
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3991 3992

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
3993
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
3994 3995 3996 3997 3998 3999 4000

	/* 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");

4001 4002 4003
	if (PageHighMem(page)) {
		unsigned long flags;

4004
		/* FIXME: use a bounce buffer */
4005 4006
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4007

4008
		/* do the actual data transfer */
4009
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
4010

4011 4012 4013 4014
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4015
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
4016
	}
L
Linus Torvalds 已提交
4017

T
Tejun Heo 已提交
4018 4019
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
4020

T
Tejun Heo 已提交
4021
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4022 4023 4024 4025 4026
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4027 4028 4029 4030
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
4031
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
4032 4033 4034 4035 4036
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4037

4038 4039 4040 4041 4042 4043
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
4044
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4045

T
Tejun Heo 已提交
4046 4047
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
4048 4049 4050 4051 4052 4053
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069
/**
 *	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");
4070
	WARN_ON(qc->dev->cdb_len < 12);
4071

4072
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087
	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
4088 4089
}

A
Albert Lee 已提交
4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101
/**
 *	__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
4102 4103 4104
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4105
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4106 4107 4108 4109 4110
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4111
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4112
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4113 4114

next_sg:
4115
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4116
		/*
4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127
		 * 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 */
4128 4129
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4130 4131

		for (i = 0; i < words; i++)
4132
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4133

A
Albert Lee 已提交
4134
		ap->hsm_task_state = HSM_ST_LAST;
4135 4136 4137
		return;
	}

4138
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4139 4140 4141 4142 4143 4144 4145 4146

	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;

4147
	/* don't overrun current sg */
4148
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4149 4150 4151 4152

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

4153 4154
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4155 4156 4157
	if (PageHighMem(page)) {
		unsigned long flags;

4158
		/* FIXME: use bounce buffer */
4159 4160
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4161

4162
		/* do the actual data transfer */
4163
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4164

4165 4166 4167 4168
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4169
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4170
	}
L
Linus Torvalds 已提交
4171 4172 4173 4174 4175

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

4176
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4177 4178 4179 4180
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4181
	if (bytes)
L
Linus Torvalds 已提交
4182 4183 4184
		goto next_sg;
}

A
Albert Lee 已提交
4185 4186 4187 4188 4189 4190 4191 4192 4193 4194
/**
 *	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
4195 4196 4197 4198 4199 4200 4201
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;

4202 4203 4204 4205 4206 4207 4208 4209 4210 4211
	/* 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
4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222
	bytes = (bc_hi << 8) | bc_lo;

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

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

T
Tejun Heo 已提交
4223
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4224

L
Linus Torvalds 已提交
4225 4226 4227 4228 4229
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4230
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4231
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4232
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4233 4234 4235
}

/**
4236 4237 4238
 *	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
4239
 *
4240 4241
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4242
 */
4243 4244

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4245
{
4246 4247
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4248

4249 4250 4251 4252
	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
4253

4254 4255 4256
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4257 4258
	}

4259 4260
	return 0;
}
L
Linus Torvalds 已提交
4261

T
Tejun Heo 已提交
4262 4263 4264 4265 4266 4267 4268 4269
/**
 *	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
4270
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4271 4272 4273 4274 4275 4276 4277 4278 4279
 *	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) {
4280
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4281

J
Jeff Garzik 已提交
4282 4283
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4284 4285 4286 4287
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4288
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4289 4290 4291 4292 4293
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4294
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4295 4296 4297 4298 4299 4300 4301 4302
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4303
			spin_lock_irqsave(ap->lock, flags);
4304
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4305
			ata_qc_complete(qc);
4306
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4307 4308 4309
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4310

4311
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4312 4313
}

4314 4315 4316 4317 4318 4319 4320 4321 4322 4323
/**
 *	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.
 */
4324 4325
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4326
{
4327 4328 4329
	unsigned long flags = 0;
	int poll_next;

4330 4331
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4332 4333 4334 4335
	/* 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).
	 */
4336
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4337

4338
fsm_start:
4339
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4340
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4341

4342 4343
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4344 4345 4346 4347 4348 4349 4350 4351
		/* 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);

4352
		/* check device status */
4353 4354 4355 4356 4357 4358 4359 4360 4361
		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
4362
			ap->hsm_task_state = HSM_ST_ERR;
4363
			goto fsm_start;
L
Linus Torvalds 已提交
4364 4365
		}

4366 4367
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4368 4369 4370
		 * 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.
4371 4372
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4373 4374
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4375
			qc->err_mask |= AC_ERR_HSM;
4376 4377
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4378
		}
L
Linus Torvalds 已提交
4379

4380 4381 4382 4383 4384 4385
		/* 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)
4386
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4387

4388 4389 4390 4391
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4392

4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404
			/* 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)
4405
			spin_unlock_irqrestore(ap->lock, flags);
4406 4407 4408 4409

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4410
		break;
4411

4412 4413 4414 4415 4416
	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) {
4417 4418 4419
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4420 4421 4422
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4423

4424 4425
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4426 4427 4428
			 * 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.
4429 4430
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4431 4432 4433
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4434
				qc->err_mask |= AC_ERR_HSM;
4435 4436
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4437
			}
L
Linus Torvalds 已提交
4438

4439
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4440

4441 4442 4443
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4444

4445 4446 4447 4448
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4449 4450 4451 4452
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4453 4454 4455 4456 4457 4458
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4459

4460 4461 4462
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4463

4464 4465 4466 4467 4468 4469 4470 4471 4472
			/* 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.
4473 4474 4475 4476
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4477 4478 4479 4480 4481 4482 4483

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

4484 4485 4486
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4487 4488 4489 4490 4491 4492
				/* 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;
4493 4494
			}

4495 4496 4497 4498 4499 4500
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4501
				status = ata_wait_idle(ap);
4502 4503 4504 4505 4506
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4507
		poll_next = 1;
L
Linus Torvalds 已提交
4508 4509
		break;

A
Albert Lee 已提交
4510
	case HSM_ST_LAST:
4511 4512
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4513 4514 4515 4516 4517
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4518
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4519
			ap->print_id, qc->dev->devno, status);
4520

4521 4522
		WARN_ON(qc->err_mask);

4523
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4524

4525
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4526
		ata_hsm_qc_complete(qc, in_wq);
4527 4528

		poll_next = 0;
L
Linus Torvalds 已提交
4529 4530
		break;

A
Albert Lee 已提交
4531
	case HSM_ST_ERR:
4532 4533 4534 4535 4536 4537
		/* 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;
4538

4539
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4540
		ata_hsm_qc_complete(qc, in_wq);
4541 4542

		poll_next = 0;
4543 4544
		break;
	default:
4545
		poll_next = 0;
4546
		BUG();
L
Linus Torvalds 已提交
4547 4548
	}

4549
	return poll_next;
L
Linus Torvalds 已提交
4550 4551
}

4552
static void ata_pio_task(struct work_struct *work)
4553
{
4554 4555 4556
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4557
	u8 status;
4558
	int poll_next;
4559

J
Jeff Garzik 已提交
4560
fsm_start:
4561
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4562

4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574
	/*
	 * 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) {
4575
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4576 4577
			return;
		}
4578 4579
	}

4580 4581
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4582

4583 4584 4585 4586
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4587
		goto fsm_start;
4588 4589
}

L
Linus Torvalds 已提交
4590 4591 4592 4593 4594 4595
/**
 *	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
4596
 *	None.
L
Linus Torvalds 已提交
4597 4598 4599 4600 4601 4602 4603
 */

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

4604
	/* no command while frozen */
4605
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4606 4607
		return NULL;

4608 4609
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4610
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4611
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625
			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
4626
 *	None.
L
Linus Torvalds 已提交
4627 4628
 */

T
Tejun Heo 已提交
4629
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4630
{
T
Tejun Heo 已提交
4631
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4632 4633 4634 4635 4636 4637 4638 4639
	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
4640
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653
	}

	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
4654
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4655 4656 4657
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4658 4659 4660
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4661
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4662

4663 4664 4665 4666
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4667
		clear_bit(tag, &ap->qc_allocated);
4668
	}
L
Linus Torvalds 已提交
4669 4670
}

4671
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4672
{
4673 4674
	struct ata_port *ap = qc->ap;

4675 4676
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4677 4678 4679 4680

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

4681
	/* command should be marked inactive atomically with qc completion */
4682 4683 4684 4685
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4686

4687 4688 4689 4690 4691
	/* 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;
4692
	ap->qc_active &= ~(1 << qc->tag);
4693

L
Linus Torvalds 已提交
4694
	/* call completion callback */
4695
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4696 4697
}

4698 4699 4700 4701 4702 4703 4704 4705
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;
}

4706 4707 4708 4709 4710 4711 4712 4713 4714
/**
 *	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
4715
 *	spin_lock_irqsave(host lock)
4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734
 */
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) {
4735
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4736 4737 4738 4739 4740 4741 4742

		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 */
4743
				fill_result_tf(qc);
4744 4745 4746 4747 4748 4749 4750
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4751
			fill_result_tf(qc);
4752 4753 4754 4755 4756 4757 4758 4759

		__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)
4760
			fill_result_tf(qc);
4761 4762 4763 4764 4765

		__ata_qc_complete(qc);
	}
}

4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777
/**
 *	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
4778
 *	spin_lock_irqsave(host lock)
4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814
 *
 *	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
4815 4816 4817 4818 4819
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4820
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848
	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
4849
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4850
 */
4851
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4852 4853 4854
{
	struct ata_port *ap = qc->ap;

4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868
	/* 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;
	}

4869
	qc->flags |= ATA_QCFLAG_ACTIVE;
4870
	ap->qc_active |= 1 << qc->tag;
4871

L
Linus Torvalds 已提交
4872 4873 4874
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4875
				goto sg_err;
L
Linus Torvalds 已提交
4876 4877
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4878
				goto sg_err;
L
Linus Torvalds 已提交
4879 4880 4881 4882 4883 4884 4885
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4886 4887 4888 4889
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4890

4891 4892
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4893 4894 4895
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906
}

/**
 *	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
4907 4908
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4909
 *	LOCKING:
J
Jeff Garzik 已提交
4910
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4911 4912
 *
 *	RETURNS:
4913
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4914 4915
 */

4916
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4917 4918 4919
{
	struct ata_port *ap = qc->ap;

4920 4921 4922 4923 4924 4925
	/* 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:
4926
		case ATA_PROT_NODATA:
4927 4928 4929 4930 4931 4932
		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)
4933
				/* see ata_dma_blacklisted() */
4934 4935 4936 4937 4938 4939 4940
				BUG();
			break;
		default:
			break;
		}
	}

4941 4942 4943 4944 4945 4946 4947 4948
	/* 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;

4949
	/* select the device */
L
Linus Torvalds 已提交
4950 4951
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4952
	/* start the command */
L
Linus Torvalds 已提交
4953 4954
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4955 4956 4957
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4958
		ata_tf_to_host(ap, &qc->tf);
4959 4960 4961
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
4962
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4963

L
Linus Torvalds 已提交
4964 4965 4966
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
4967
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4968

L
Linus Torvalds 已提交
4969 4970 4971
		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 */
4972
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4973 4974
		break;

4975 4976 4977
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
4978

J
Jeff Garzik 已提交
4979
		ata_tf_to_host(ap, &qc->tf);
4980

4981 4982 4983
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
4984
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4985 4986

			/* always send first data block using
4987
			 * the ata_pio_task() codepath.
4988
			 */
4989
		} else {
4990 4991 4992 4993
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
4994
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
4995 4996 4997 4998

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
4999 5000
		}

L
Linus Torvalds 已提交
5001 5002 5003 5004
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5005 5006 5007
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5008
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5009

5010 5011 5012 5013 5014
		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))
5015
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5016 5017 5018
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5019
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5020

L
Linus Torvalds 已提交
5021 5022
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5023 5024 5025 5026
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5027
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5028 5029 5030 5031
		break;

	default:
		WARN_ON(1);
5032
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047
	}

	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
5048
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5049 5050 5051 5052 5053 5054 5055 5056
 *
 *	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)
{
5057
	struct ata_eh_info *ehi = &ap->eh_info;
5058
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5059

5060
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5061
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5062

5063 5064 5065
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5066 5067 5068
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5069

5070 5071 5072 5073 5074
		/* 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
5075 5076
			goto idle_irq;
		break;
5077 5078 5079 5080 5081
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
5082 5083
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5084 5085 5086 5087 5088 5089 5090

			/* 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);
5091 5092 5093 5094 5095 5096

			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;
			}
5097 5098 5099 5100
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5101 5102 5103 5104
	default:
		goto idle_irq;
	}

5105 5106 5107 5108
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5109

5110 5111 5112 5113
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5114

5115 5116
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5117

5118
	ata_hsm_move(ap, qc, status, 0);
5119 5120 5121 5122 5123

	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
5124 5125 5126 5127 5128 5129 5130
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5131
		ap->ops->irq_ack(ap, 0); /* debug trap */
5132
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5133
		return 1;
L
Linus Torvalds 已提交
5134 5135 5136 5137 5138 5139 5140
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5141
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5142
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5143
 *
J
Jeff Garzik 已提交
5144 5145 5146
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5147
 *	LOCKING:
J
Jeff Garzik 已提交
5148
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5149 5150
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5151
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5152 5153
 */

5154
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5155
{
J
Jeff Garzik 已提交
5156
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5157 5158 5159 5160 5161
	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
5162
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5163

J
Jeff Garzik 已提交
5164
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5165 5166
		struct ata_port *ap;

J
Jeff Garzik 已提交
5167
		ap = host->ports[i];
5168
		if (ap &&
J
Jeff Garzik 已提交
5169
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5170 5171 5172
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5173
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5174
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5175 5176 5177 5178
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5179
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5180 5181 5182 5183

	return IRQ_RETVAL(handled);
}

5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320
/**
 *	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
5321

5322
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5323
{
5324
	unsigned int err_mask;
J
Jens Axboe 已提交
5325 5326 5327 5328 5329
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5330
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5331 5332 5333 5334
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5335 5336 5337 5338 5339 5340 5341
	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
5342 5343
}

J
Jeff Garzik 已提交
5344 5345 5346
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5347 5348 5349 5350
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5351 5352
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391

		/* 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
5392 5393
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5394 5395
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5396
 *	Suspend @host.  Actual operation is performed by EH.  This
5397 5398 5399 5400 5401 5402 5403 5404 5405
 *	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
5406
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5407 5408 5409
{
	int i, j, rc;

J
Jeff Garzik 已提交
5410
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5411 5412 5413 5414 5415 5416 5417
	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
5418 5419
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433

		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
5434
	host->dev->power.power_state = mesg;
5435 5436 5437
	return 0;

 fail:
J
Jeff Garzik 已提交
5438
	ata_host_resume(host);
5439 5440 5441 5442
	return rc;
}

/**
J
Jeff Garzik 已提交
5443 5444
 *	ata_host_resume - resume host
 *	@host: host to resume
5445
 *
J
Jeff Garzik 已提交
5446
 *	Resume @host.  Actual operation is performed by EH.  This
5447 5448 5449 5450 5451 5452
 *	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
5453
void ata_host_resume(struct ata_host *host)
5454
{
J
Jeff Garzik 已提交
5455 5456 5457
	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;
5458 5459
}

5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471
/**
 *	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.
 */
5472
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5473
{
5474
	struct device *dev = ap->dev;
5475
	int rc;
L
Linus Torvalds 已提交
5476

5477 5478
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5479 5480 5481
	if (!ap->prd)
		return -ENOMEM;

5482
	rc = ata_pad_alloc(ap, dev);
5483
	if (rc)
5484
		return rc;
L
Linus Torvalds 已提交
5485

5486 5487
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5488 5489 5490
	return 0;
}

5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502
/**
 *	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;
5503 5504
	unsigned long flags;

5505 5506 5507
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5508 5509
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5510
	 * host lock.
5511
	 */
5512
	spin_lock_irqsave(ap->lock, flags);
5513
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5514
	spin_unlock_irqrestore(ap->lock, flags);
5515

5516 5517
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5518 5519 5520 5521 5522
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5523
/**
B
Brian King 已提交
5524
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5525
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5526
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5527 5528 5529
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5530
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5531
 *
L
Linus Torvalds 已提交
5532
 *	LOCKING:
J
Jeff Garzik 已提交
5533
 *	Inherited from caller.
L
Linus Torvalds 已提交
5534
 */
J
Jeff Garzik 已提交
5535
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5536
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5537 5538 5539
{
	unsigned int i;

J
Jeff Garzik 已提交
5540
	ap->lock = &host->lock;
5541
	ap->flags = ATA_FLAG_DISABLED;
T
Tejun Heo 已提交
5542
	ap->print_id = ata_print_id++;
L
Linus Torvalds 已提交
5543
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5544
	ap->host = host;
5545
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5546
	ap->port_no = port_no;
5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559
	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;
	}
5560
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5561 5562
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5563 5564 5565 5566 5567 5568

#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
5569
#else
5570
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5571
#endif
L
Linus Torvalds 已提交
5572

5573 5574 5575
	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);
5576
	INIT_LIST_HEAD(&ap->eh_done_q);
5577
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5578

5579 5580 5581 5582 5583
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5584 5585
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5586
		dev->ap = ap;
5587
		dev->devno = i;
5588
		ata_dev_init(dev);
5589
	}
L
Linus Torvalds 已提交
5590 5591 5592 5593 5594 5595 5596 5597 5598

#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
5599
/**
5600 5601 5602
 *	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
5603
 *
5604
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5605 5606 5607 5608
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5609
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5610
{
J
Jeff Garzik 已提交
5611
	ap->scsi_host = shost;
B
Brian King 已提交
5612

T
Tejun Heo 已提交
5613
	shost->unique_id = ap->print_id;
5614 5615 5616 5617
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5618 5619
}

L
Linus Torvalds 已提交
5620
/**
5621
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5622
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5623
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5624 5625
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5626 5627
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5628
 *	LOCKING:
J
Jeff Garzik 已提交
5629
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5630 5631
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5632
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5633
 */
5634
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5635
				      struct ata_host *host,
L
Linus Torvalds 已提交
5636 5637
				      unsigned int port_no)
{
5638
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5639 5640 5641
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5642

5643
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5644
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5645 5646 5647 5648 5649
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5650 5651
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5652 5653
		return NULL;

5654
	shost->transportt = &ata_scsi_transport_template;
5655

5656
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5657

J
Jeff Garzik 已提交
5658
	ata_port_init(ap, host, ent, port_no);
5659
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5660 5661 5662 5663

	return ap;
}

5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

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

		if (!ap)
			continue;

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

		scsi_host_put(ap->scsi_host);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
}

5685
/**
J
Jeff Garzik 已提交
5686 5687 5688 5689 5690
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5691 5692 5693 5694 5695 5696
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5697 5698
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5699
{
J
Jeff Garzik 已提交
5700 5701 5702 5703
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5704 5705
}

L
Linus Torvalds 已提交
5706
/**
J
Jeff Garzik 已提交
5707 5708 5709 5710 5711 5712 5713 5714 5715 5716
 *	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
5717 5718
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5719
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5720 5721
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5722
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5723
 */
J
Jeff Garzik 已提交
5724
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5725
{
5726
	unsigned int i;
L
Linus Torvalds 已提交
5727
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5728
	struct ata_host *host;
5729
	int rc;
L
Linus Torvalds 已提交
5730 5731

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5732

5733 5734 5735 5736
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5737 5738 5739 5740

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

L
Linus Torvalds 已提交
5741
	/* alloc a container for our list of ATA ports (buses) */
5742 5743
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5744
	if (!host)
5745 5746 5747
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5748

J
Jeff Garzik 已提交
5749 5750 5751 5752
	ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
	host->n_ports = ent->n_ports;
	host->irq = ent->irq;
	host->irq2 = ent->irq2;
T
Tejun Heo 已提交
5753
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5754
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5755 5756

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5757
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5758 5759
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5760
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5761

J
Jeff Garzik 已提交
5762
		ap = ata_port_add(ent, host, i);
5763
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5764 5765 5766
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5767 5768 5769 5770 5771 5772 5773 5774 5775 5776
		/* 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
5777 5778
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5779 5780 5781
			goto err_out;
		}

5782 5783 5784 5785
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5786 5787 5788 5789 5790
		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
				(ap->pio_mask << ATA_SHIFT_PIO);

		/* print per-port info to dmesg */
T
Tejun Heo 已提交
5791 5792
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5793 5794 5795 5796 5797
				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,
5798
				irq_line);
L
Linus Torvalds 已提交
5799

5800 5801
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5802 5803
	}

5804
	/* obtain irq, that may be shared between channels */
5805 5806
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5807 5808 5809
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5810
		goto err_out;
5811
	}
L
Linus Torvalds 已提交
5812

5813 5814 5815 5816 5817 5818
	/* 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);

5819 5820 5821
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5822 5823 5824
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5825
			goto err_out;
5826 5827 5828
		}
	}

5829
	/* resource acquisition complete */
T
Tejun Heo 已提交
5830
	devres_remove_group(dev, ata_device_add);
5831

L
Linus Torvalds 已提交
5832 5833
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5834 5835
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5836
		u32 scontrol;
L
Linus Torvalds 已提交
5837 5838
		int rc;

5839 5840 5841 5842 5843 5844 5845
		/* 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
5846
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5847
		if (rc) {
5848
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5849 5850 5851 5852 5853 5854
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5855

5856
		if (ap->ops->error_handler) {
5857
			struct ata_eh_info *ehi = &ap->eh_info;
5858 5859 5860 5861 5862
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5863
			spin_lock_irqsave(ap->lock, flags);
5864

5865 5866 5867
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5868

5869
			ap->pflags |= ATA_PFLAG_LOADING;
5870 5871
			ata_port_schedule_eh(ap);

5872
			spin_unlock_irqrestore(ap->lock, flags);
5873 5874 5875 5876

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
T
Tejun Heo 已提交
5877
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5878
			rc = ata_bus_probe(ap);
T
Tejun Heo 已提交
5879
			DPRINTK("ata%u: bus probe end\n", ap->print_id);
5880 5881 5882 5883 5884 5885 5886 5887 5888 5889

			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
5890 5891 5892
	}

	/* probes are done, now scan each port's disk(s) */
5893
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5894 5895
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5896

J
Jeff Garzik 已提交
5897
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5898 5899 5900 5901 5902
	}

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

5903 5904 5905 5906
 err_out:
	devres_release_group(dev, ata_device_add);
	dev_set_drvdata(dev, NULL);
	VPRINTK("EXIT, returning %d\n", rc);
L
Linus Torvalds 已提交
5907 5908 5909
	return 0;
}

5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926
/**
 *	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)
5927
		goto skip_eh;
5928 5929

	/* tell EH we're leaving & flush EH */
5930
	spin_lock_irqsave(ap->lock, flags);
5931
	ap->pflags |= ATA_PFLAG_UNLOADING;
5932
	spin_unlock_irqrestore(ap->lock, flags);
5933 5934 5935 5936 5937 5938

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5939
	spin_lock_irqsave(ap->lock, flags);
5940 5941 5942 5943

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

5944
	spin_unlock_irqrestore(ap->lock, flags);
5945 5946 5947 5948 5949

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5950
	spin_lock_irqsave(ap->lock, flags);
5951
	ata_port_freeze(ap);	/* won't be thawed */
5952
	spin_unlock_irqrestore(ap->lock, flags);
5953 5954 5955 5956 5957 5958 5959 5960 5961 5962

	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);

5963
 skip_eh:
5964
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5965
	scsi_remove_host(ap->scsi_host);
5966 5967
}

T
Tejun Heo 已提交
5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

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

5985 5986 5987 5988 5989
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

5990
	probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
5991 5992 5993 5994 5995 5996 5997 5998 5999 6000
	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
6001
	probe_ent->port_flags = port->flags;
6002 6003 6004 6005
	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;
6006
	probe_ent->private_data = port->private_data;
6007 6008 6009 6010

	return probe_ent;
}

L
Linus Torvalds 已提交
6011 6012 6013
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6014 6015 6016 6017 6018 6019 6020
 *
 *	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
6021
 */
E
Edward Falk 已提交
6022

L
Linus Torvalds 已提交
6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036
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
6037

6038 6039
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6040 6041 6042 6043
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6044 6045 6046
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
6047 6048 6049 6050
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6051
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6052 6053
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6054
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6055

T
Tejun Heo 已提交
6056
	ata_host_detach(host);
L
Linus Torvalds 已提交
6057 6058 6059
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6060
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091
{
	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
6092

6093
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6094 6095
{
	pci_save_state(pdev);
6096
	pci_disable_device(pdev);
6097

6098
	if (mesg.event == PM_EVENT_SUSPEND)
6099
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6100 6101
}

6102
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6103
{
6104 6105
	int rc;

J
Jens Axboe 已提交
6106 6107
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6108

T
Tejun Heo 已提交
6109
	rc = pcim_enable_device(pdev);
6110 6111 6112 6113 6114 6115
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
6116
	pci_set_master(pdev);
6117
	return 0;
6118 6119
}

6120
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6121
{
J
Jeff Garzik 已提交
6122
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6123 6124
	int rc = 0;

J
Jeff Garzik 已提交
6125
	rc = ata_host_suspend(host, mesg);
6126 6127 6128
	if (rc)
		return rc;

6129
	ata_pci_device_do_suspend(pdev, mesg);
6130 6131 6132 6133 6134 6135

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6136
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6137
	int rc;
6138

6139 6140 6141 6142
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6143
}
L
Linus Torvalds 已提交
6144 6145 6146 6147 6148
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6149
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6150 6151 6152 6153
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6154 6155 6156 6157 6158 6159
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6160 6161 6162 6163 6164 6165 6166
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6167
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6168 6169
}

6170
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6171 6172
module_exit(ata_exit);

6173
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6174
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193

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;
}

6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239
/**
 *	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
6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272
/*
 * 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
6273 6274 6275 6276 6277 6278 6279
/*
 * 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.
 */

6280 6281 6282
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
6283
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6284 6285
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6286
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6287
EXPORT_SYMBOL_GPL(ata_device_add);
T
Tejun Heo 已提交
6288
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6289 6290
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6291
EXPORT_SYMBOL_GPL(ata_hsm_move);
6292
EXPORT_SYMBOL_GPL(ata_qc_complete);
6293
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305
EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
EXPORT_SYMBOL_GPL(ata_interrupt);
T
Tejun Heo 已提交
6306 6307
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6308
EXPORT_SYMBOL_GPL(ata_qc_prep);
6309
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6310 6311 6312 6313 6314
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);
6315 6316 6317 6318 6319
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
6320
EXPORT_SYMBOL_GPL(ata_port_probe);
6321
EXPORT_SYMBOL_GPL(ata_dev_disable);
6322
EXPORT_SYMBOL_GPL(sata_set_spd);
6323 6324
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6325 6326 6327
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6328
EXPORT_SYMBOL_GPL(ata_std_prereset);
6329
EXPORT_SYMBOL_GPL(ata_std_softreset);
6330
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6331 6332
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6333 6334
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6335
EXPORT_SYMBOL_GPL(ata_port_disable);
6336
EXPORT_SYMBOL_GPL(ata_ratelimit);
6337
EXPORT_SYMBOL_GPL(ata_wait_register);
6338
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6339
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6340 6341 6342
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6343
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6344
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6345
EXPORT_SYMBOL_GPL(ata_host_intr);
6346 6347 6348 6349 6350 6351
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
6352 6353
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6354 6355
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6356
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6357
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6358 6359
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6360
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6361 6362 6363
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6364 6365 6366 6367 6368
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6369 6370
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6371 6372
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
Alan Cox 已提交
6373 6374
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6375
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6376 6377 6378

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6379 6380

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6381 6382
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6383 6384 6385
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6386 6387
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6388
EXPORT_SYMBOL_GPL(ata_do_eh);
6389 6390 6391 6392
EXPORT_SYMBOL_GPL(ata_irq_on);
EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
EXPORT_SYMBOL_GPL(ata_irq_ack);
EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
A
Akira Iguchi 已提交
6393
EXPORT_SYMBOL_GPL(ata_dev_try_classify);