libata-core.c 158.5 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

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

#include "libata.h"

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

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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void ata_dev_disable(struct ata_device *dev)
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{
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	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
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		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
601 602
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
603 604 605 606
		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.
706 707 708
 *
 *	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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	/* see if device passed diags: if master then continue and warn later */
	if (err == 0 && device == 0)
		/* diagnostic fail : do nothing _YET_ */
		ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
	else if (err == 1)
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		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
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		return ATA_DEV_NONE;
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738
	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
740

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	if (class == ATA_DEV_UNKNOWN)
742
		return ATA_DEV_NONE;
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	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
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.
 */

763 764
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

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

	WARN_ON(!(len & 1));

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

962
static inline void ata_dump_id(const u16 *id)
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{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
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		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
979 980 981 982 983
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
986 987
		id[88],
		id[93]);
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}

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

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

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

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1034

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

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

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

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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

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

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

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

	DPRINTK("ENTER\n");

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

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

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

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

	complete(waiting);
}

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

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

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

1189
	/* initialize internal qc */
1190

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

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

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

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

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

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

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

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

1237
	ata_qc_issue(qc);
1238

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

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

	ata_port_flush_task(ap);
1244

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

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

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

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

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

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

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 1567 1568
 *	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.
1569 1570
 *
 *	LOCKING:
1571 1572 1573 1574
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1575
 */
1576
int ata_dev_configure(struct ata_device *dev)
1577
{
T
Tejun Heo 已提交
1578
	struct ata_port *ap = dev->ap;
1579
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1580
	const u16 *id = dev->id;
1581
	unsigned int xfer_mask;
1582
	char revbuf[7];		/* XYZ-99\0 */
1583 1584
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1585
	int rc;
1586

1587
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1588 1589
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1590
		return 0;
1591 1592
	}

1593
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1594
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1595

1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
	/* 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);

1606
	/* print device capabilities */
1607
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1608 1609 1610
		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",
1611
			       __FUNCTION__,
1612 1613
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1614

1615
	/* initialize to-be-configured parameters */
1616
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1617 1618 1619 1620 1621 1622 1623
	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
1624 1625 1626 1627
	/*
	 * common ATA, ATAPI feature tests
	 */

1628
	/* find max transfer mode; for printk only */
1629
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1630

1631 1632
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1633 1634 1635

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1636 1637
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1638 1639 1640
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1641 1642 1643 1644 1645
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1646
		dev->n_sectors = ata_id_n_sectors(id);
1647

1648
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1649
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1650 1651
				sizeof(fwrevbuf));

1652
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1653 1654 1655 1656 1657
				sizeof(modelbuf));

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

1658
		if (ata_id_has_lba(id)) {
1659
			const char *lba_desc;
1660
			char ncq_desc[20];
1661

1662 1663
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1664
			if (ata_id_has_lba48(id)) {
1665
				dev->flags |= ATA_DFLAG_LBA48;
1666
				lba_desc = "LBA48";
1667 1668 1669 1670

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1671
			}
1672

1673 1674 1675
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1676
			/* print device info to dmesg */
1677 1678 1679 1680 1681 1682 1683
			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",
1684
					(unsigned long long)dev->n_sectors,
1685 1686
					dev->multi_count, lba_desc, ncq_desc);
			}
1687
		} else {
1688 1689 1690
			/* CHS */

			/* Default translation */
1691 1692 1693
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1694

1695
			if (ata_id_current_chs_valid(id)) {
1696
				/* Current CHS translation is valid. */
1697 1698 1699
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1700 1701 1702
			}

			/* print device info to dmesg */
1703
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1704
				ata_dev_printk(dev, KERN_INFO,
1705 1706 1707
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1708
				ata_dev_printk(dev, KERN_INFO,
1709 1710 1711 1712 1713
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1714 1715
		}

1716
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1717 1718 1719
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1720
	else if (dev->class == ATA_DEV_ATAPI) {
1721 1722
		char *cdb_intr_string = "";

1723
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1724
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1725
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1726 1727
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1728
			rc = -EINVAL;
L
Linus Torvalds 已提交
1729 1730
			goto err_out_nosup;
		}
1731
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1732

1733
		if (ata_id_cdb_intr(dev->id)) {
1734
			dev->flags |= ATA_DFLAG_CDB_INTR;
1735 1736
			cdb_intr_string = ", CDB intr";
		}
1737

L
Linus Torvalds 已提交
1738
		/* print device info to dmesg */
1739
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1740 1741 1742
			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
1743 1744
	}

1745 1746 1747 1748 1749
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	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");
		}
	}

1762
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1763
	if (ata_dev_knobble(dev)) {
1764
		if (ata_msg_drv(ap) && print_info)
1765 1766
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1767
		dev->udma_mask &= ATA_UDMA5;
1768 1769 1770
		dev->max_sectors = ATA_MAX_SECTORS;
	}

1771 1772 1773
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
		dev->max_sectors = min(ATA_MAX_SECTORS_128, dev->max_sectors);

1774 1775 1776 1777
	/* limit ATAPI DMA to R/W commands only */
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
		dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;

1778
	if (ap->ops->dev_config)
1779
		ap->ops->dev_config(dev);
1780

1781 1782 1783
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1784
	return 0;
L
Linus Torvalds 已提交
1785 1786

err_out_nosup:
1787
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1788 1789
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1790
	return rc;
L
Linus Torvalds 已提交
1791 1792
}

A
Alan Cox 已提交
1793
/**
1794
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
1795 1796
 *	@ap: port
 *
1797
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
1798 1799 1800 1801 1802 1803 1804 1805 1806
 *	detection.
 */

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

/**
1807
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
1808 1809
 *	@ap: port
 *
1810
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
 *	detection.
 */

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

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

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

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

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

L
Linus Torvalds 已提交
1843 1844 1845 1846
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1847 1848 1849 1850
 *	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
1851
 *	LOCKING:
J
Jeff Garzik 已提交
1852
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1853 1854
 *
 *	RETURNS:
1855
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1856 1857
 */

1858
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1859
{
1860
	unsigned int classes[ATA_MAX_DEVICES];
1861
	int tries[ATA_MAX_DEVICES];
1862
	int i, rc;
1863
	struct ata_device *dev;
L
Linus Torvalds 已提交
1864

1865
	ata_port_probe(ap);
1866

1867 1868 1869 1870
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
1871
	/* reset and determine device classes */
1872
	ap->ops->phy_reset(ap);
1873

1874 1875
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1876

1877 1878 1879 1880 1881
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1882

1883
		dev->class = ATA_DEV_UNKNOWN;
1884
	}
L
Linus Torvalds 已提交
1885

1886
	ata_port_probe(ap);
1887

A
Alan Cox 已提交
1888 1889 1890 1891 1892 1893
	/* 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;

1894 1895 1896 1897 1898
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

	for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
1899
		dev = &ap->device[i];
1900

1901 1902
		if (tries[i])
			dev->class = classes[i];
1903

1904
		if (!ata_dev_enabled(dev))
1905 1906
			continue;

1907 1908
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1909 1910
		if (rc)
			goto fail;
1911 1912
	}

A
Alan Cox 已提交
1913 1914 1915 1916
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

1917 1918 1919 1920 1921 1922 1923
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

	for(i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;
1924

1925 1926 1927
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1928 1929
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1930 1931
	}

1932
	/* configure transfer mode */
1933
	rc = ata_set_mode(ap, &dev);
1934
	if (rc)
1935
		goto fail;
L
Linus Torvalds 已提交
1936

1937 1938 1939
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1940

1941 1942
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1943
	ap->ops->port_disable(ap);
1944
	return -ENODEV;
1945 1946

 fail:
1947 1948
	tries[dev->devno]--;

1949 1950
	switch (rc) {
	case -EINVAL:
1951
		/* eeek, something went very wrong, give up */
1952 1953
		tries[dev->devno] = 0;
		break;
1954 1955 1956 1957

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
1958
	case -EIO:
1959 1960 1961 1962 1963 1964 1965
		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);
		}
1966 1967
	}

1968
	if (!tries[dev->devno])
T
Tejun Heo 已提交
1969
		ata_dev_disable(dev);
1970

1971
	goto retry;
L
Linus Torvalds 已提交
1972 1973 1974
}

/**
J
Jeff Garzik 已提交
1975 1976
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1977
 *
J
Jeff Garzik 已提交
1978 1979 1980
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1981
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1982
 *	serialization.
L
Linus Torvalds 已提交
1983 1984 1985 1986
 */

void ata_port_probe(struct ata_port *ap)
{
1987
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1988 1989
}

1990 1991 1992 1993 1994 1995 1996 1997 1998
/**
 *	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.
 */
1999
void sata_print_link_status(struct ata_port *ap)
2000
{
2001
	u32 sstatus, scontrol, tmp;
2002

2003
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2004
		return;
2005
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2006

2007
	if (ata_port_online(ap)) {
2008
		tmp = (sstatus >> 4) & 0xf;
2009 2010 2011
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2012
	} else {
2013 2014 2015
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2016 2017 2018
	}
}

L
Linus Torvalds 已提交
2019
/**
J
Jeff Garzik 已提交
2020 2021
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2022
 *
J
Jeff Garzik 已提交
2023 2024 2025
 *	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
2026 2027
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2028
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2029 2030 2031 2032 2033 2034 2035 2036
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2037
		/* issue phy wake/reset */
2038
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2039 2040 2041
		/* 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
2042
	}
2043 2044
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2045 2046 2047 2048

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2049
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2050 2051 2052 2053
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2054 2055
	/* print link status */
	sata_print_link_status(ap);
2056

2057
	/* TODO: phy layer with polling, timeouts, etc. */
2058
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2059
		ata_port_probe(ap);
2060
	else
L
Linus Torvalds 已提交
2061 2062
		ata_port_disable(ap);

2063
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
		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
2075 2076
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2077
 *
J
Jeff Garzik 已提交
2078 2079
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2080 2081
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2082
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2083 2084 2085 2086 2087
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2088
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2089 2090 2091 2092
		return;
	ata_bus_reset(ap);
}

2093 2094 2095 2096 2097 2098 2099
/**
 *	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
 */
2100

T
Tejun Heo 已提交
2101
struct ata_device *ata_dev_pair(struct ata_device *adev)
2102
{
T
Tejun Heo 已提交
2103
	struct ata_port *ap = adev->ap;
2104
	struct ata_device *pair = &ap->device[1 - adev->devno];
2105
	if (!ata_dev_enabled(pair))
2106 2107 2108 2109
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2110
/**
J
Jeff Garzik 已提交
2111 2112
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2113
 *
J
Jeff Garzik 已提交
2114 2115 2116 2117 2118
 *	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
2119
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2120
 *	serialization.
L
Linus Torvalds 已提交
2121 2122 2123 2124 2125 2126
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2127
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2128 2129
}

2130
/**
2131
 *	sata_down_spd_limit - adjust SATA spd limit downward
2132 2133 2134 2135
 *	@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
2136
 *	using sata_set_spd().
2137 2138 2139 2140 2141 2142 2143
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2144
int sata_down_spd_limit(struct ata_port *ap)
2145
{
2146 2147
	u32 sstatus, spd, mask;
	int rc, highbit;
2148

2149 2150 2151
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2152 2153 2154 2155 2156 2157 2158

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

2159
	spd = (sstatus >> 4) & 0xf;
2160 2161 2162 2163 2164 2165 2166 2167 2168
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2169 2170
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2171 2172 2173 2174

	return 0;
}

2175
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190
{
	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;
}

/**
2191
 *	sata_set_spd_needed - is SATA spd configuration needed
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204
 *	@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.
 */
2205
int sata_set_spd_needed(struct ata_port *ap)
2206 2207 2208
{
	u32 scontrol;

2209
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2210 2211
		return 0;

2212
	return __sata_set_spd_needed(ap, &scontrol);
2213 2214 2215
}

/**
2216
 *	sata_set_spd - set SATA spd according to spd limit
2217 2218 2219 2220 2221 2222 2223 2224 2225
 *	@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
2226
 *	changed.  Negative errno if SCR registers are inaccessible.
2227
 */
2228
int sata_set_spd(struct ata_port *ap)
2229 2230
{
	u32 scontrol;
2231
	int rc;
2232

2233 2234
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2235

2236
	if (!__sata_set_spd_needed(ap, &scontrol))
2237 2238
		return 0;

2239 2240 2241
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2242 2243 2244
	return 1;
}

A
Alan Cox 已提交
2245 2246 2247 2248 2249
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2250
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2251
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2252 2253 2254
 * 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
2255 2256 2257 2258 2259 2260 2261 2262 2263
 */

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 },

2264 2265
	{ 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
2266 2267 2268 2269 2270
	{ 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 }, */
2271

A
Alan Cox 已提交
2272 2273 2274
	{ 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 },
2275

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2276 2277 2278 2279
	{ 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 },

2280 2281
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
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Alan Cox 已提交
2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
	{ 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
2327
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2328
			return NULL;
2329
	return t;
A
Alan Cox 已提交
2330 2331 2332 2333 2334 2335 2336 2337 2338
}

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;

	/*
2339
	 * Find the mode.
2340
	 */
A
Alan Cox 已提交
2341 2342 2343 2344

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

2345 2346
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366
	/*
	 * 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.
	 */

2367
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2368 2369

	/*
2370 2371 2372
	 * 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
2373 2374
	 */

2375
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2376 2377 2378 2379 2380
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2381
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396
	 */

	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;
}

2397 2398 2399
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2400
 *	@sel: ATA_DNXFER_* selector
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411
 *
 *	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
 */
2412
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2413
{
2414 2415 2416 2417
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2418

2419 2420
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2421

2422 2423 2424 2425
	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);
2426

2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
	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);
	}
2479 2480 2481 2482 2483 2484 2485

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

	return 0;
}

T
Tejun Heo 已提交
2486
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2487
{
2488
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2489 2490
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2491

2492
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2493 2494 2495
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2496
	err_mask = ata_dev_set_xfermode(dev);
2497 2498 2499 2500
	/* 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;

2501
	if (err_mask) {
2502 2503
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2504 2505
		return -EIO;
	}
L
Linus Torvalds 已提交
2506

2507
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2508
	rc = ata_dev_revalidate(dev, 0);
2509
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2510
	if (rc)
2511
		return rc;
2512

2513 2514
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2515

2516 2517
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2518
	return 0;
L
Linus Torvalds 已提交
2519 2520 2521 2522 2523
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2524
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2525
 *
2526 2527 2528
 *	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
2529
 *
L
Linus Torvalds 已提交
2530
 *	LOCKING:
J
Jeff Garzik 已提交
2531
 *	PCI/etc. bus probe sem.
2532 2533 2534
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2535
 */
2536
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2537
{
2538
	struct ata_device *dev;
2539
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2540

2541
	/* has private set_mode? */
A
Alan 已提交
2542 2543
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2544

2545 2546
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2547
		unsigned int pio_mask, dma_mask;
2548

2549 2550
		dev = &ap->device[i];

2551
		if (!ata_dev_enabled(dev))
2552 2553
			continue;

T
Tejun Heo 已提交
2554
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2555

2556 2557 2558 2559
		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);
2560

2561
		found = 1;
2562 2563
		if (dev->dma_mode)
			used_dma = 1;
2564
	}
2565
	if (!found)
2566
		goto out;
2567 2568

	/* step 2: always set host PIO timings */
2569 2570 2571 2572 2573 2574
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2575
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2576
			rc = -EINVAL;
2577
			goto out;
2578 2579 2580 2581 2582 2583 2584
		}

		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
2585

2586
	/* step 3: set host DMA timings */
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597
	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
2598 2599

	/* step 4: update devices' xfer mode */
2600
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2601
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2602

A
Alan 已提交
2603
		/* don't update suspended devices' xfer mode */
2604
		if (!ata_dev_ready(dev))
2605 2606
			continue;

T
Tejun Heo 已提交
2607
		rc = ata_dev_set_mode(dev);
2608
		if (rc)
2609
			goto out;
2610
	}
L
Linus Torvalds 已提交
2611

2612 2613
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2614
	 */
J
Jeff Garzik 已提交
2615
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2616
		ap->host->simplex_claimed = ap;
2617

2618
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2619 2620
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);
2621 2622 2623 2624
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2625 2626
}

2627 2628 2629 2630 2631 2632 2633 2634 2635 2636
/**
 *	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
2637
 *	spin_lock_irqsave(host lock)
2638 2639 2640 2641 2642 2643 2644 2645 2646
 */

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
2647 2648 2649 2650 2651 2652
/**
 *	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
2653 2654 2655
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2656 2657 2658 2659 2660
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2661
 */
2662 2663
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2664 2665 2666 2667 2668 2669 2670
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2671 2672
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2673 2674 2675 2676
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2677
	if (status != 0xff && (status & ATA_BUSY))
2678
		ata_port_printk(ap, KERN_WARNING,
2679 2680
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2681 2682

	timeout = timer_start + tmout;
2683 2684
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2685 2686 2687 2688
		msleep(50);
		status = ata_chk_status(ap);
	}

2689 2690 2691
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2692
	if (status & ATA_BUSY) {
2693
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2694 2695
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2696
		return -EBUSY;
L
Linus Torvalds 已提交
2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722
	}

	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
2723 2724
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748
		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
2749
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
2750 2751

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2752 2753 2754 2755 2756
	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
2757 2758 2759 2760 2761 2762 2763 2764

	/* 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.
2765 2766
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2767 2768 2769
	 */
	msleep(150);

2770
	/* Before we perform post reset processing we want to see if
2771 2772 2773
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2774 2775
	if (ata_check_status(ap) == 0xFF)
		return 0;
2776

L
Linus Torvalds 已提交
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794
	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
2795
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2796
 *	Obtains host lock.
L
Linus Torvalds 已提交
2797 2798
 *
 *	SIDE EFFECTS:
2799
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2800 2801 2802 2803 2804 2805 2806
 */

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
2807
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2808

T
Tejun Heo 已提交
2809
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829

	/* 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
2830 2831
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2832 2833 2834 2835

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2836
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2837
	if ((slave_possible) && (err != 0x81))
2838
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2839 2840

	/* re-enable interrupts */
2841
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855

	/* 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
2856
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2857 2858 2859 2860 2861 2862
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2863
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2864 2865 2866 2867 2868
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887
/**
 *	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)
2888
{
2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943
	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;
2944 2945 2946 2947
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2948

2949
	scontrol = (scontrol & 0x0f0) | 0x300;
2950 2951 2952

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2953

2954 2955 2956 2957
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2958

2959
	return sata_phy_debounce(ap, params);
2960 2961
}

2962 2963 2964 2965 2966 2967 2968 2969
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) {
2970
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005

		/* 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;
3006
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3007 3008
	int rc;

3009 3010 3011 3012 3013 3014 3015 3016
	/* 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);
3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041

	/* 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;
}

3042 3043 3044 3045 3046
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
3047
 *	Reset host port using ATA SRST.
3048 3049 3050 3051 3052 3053 3054
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3055
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
3056 3057 3058 3059 3060 3061 3062
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

3063
	if (ata_port_offline(ap)) {
3064 3065 3066 3067
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080
	/* 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) {
3081 3082
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
3083 3084 3085 3086 3087 3088 3089 3090
		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);

3091
 out:
3092 3093 3094 3095 3096
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3097
 *	sata_port_hardreset - reset port via SATA phy reset
3098
 *	@ap: port to reset
3099
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3100 3101 3102 3103 3104 3105 3106 3107 3108
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3109
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3110
{
3111
	u32 scontrol;
3112
	int rc;
3113

3114 3115
	DPRINTK("ENTER\n");

3116
	if (sata_set_spd_needed(ap)) {
3117 3118 3119 3120 3121
		/* 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.
		 */
3122
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3123
			goto out;
3124

3125
		scontrol = (scontrol & 0x0f0) | 0x304;
3126 3127

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3128
			goto out;
3129

3130
		sata_set_spd(ap);
3131 3132 3133
	}

	/* issue phy wake/reset */
3134
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3135
		goto out;
3136

3137
	scontrol = (scontrol & 0x0f0) | 0x301;
3138 3139

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3140
		goto out;
3141

3142
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3143 3144 3145 3146
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3147
	/* bring phy back */
3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181
	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;
	}
3182 3183

	/* TODO: phy layer with polling, timeouts, etc. */
3184
	if (ata_port_offline(ap)) {
3185 3186 3187 3188 3189
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3190 3191 3192
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3193
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3194 3195
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3196 3197 3198
		return -EIO;
	}

3199 3200
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220
	*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)
{
3221 3222
	u32 serror;

3223 3224 3225
	DPRINTK("ENTER\n");

	/* print link status */
3226
	sata_print_link_status(ap);
3227

3228 3229 3230 3231
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3232
	/* re-enable interrupts */
3233 3234
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3235 3236 3237 3238 3239 3240 3241

	/* 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);

3242 3243 3244 3245 3246 3247 3248
	/* 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
3249 3250
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3251 3252 3253 3254

	DPRINTK("EXIT\n");
}

3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270
/**
 *	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
3271 3272
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3273 3274
{
	const u16 *old_id = dev->id;
3275 3276
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3277 3278 3279
	u64 new_n_sectors;

	if (dev->class != new_class) {
3280 3281
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3282 3283 3284
		return 0;
	}

3285 3286 3287 3288
	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]));
3289 3290 3291
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3292 3293
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3294 3295 3296 3297
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3298 3299
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3300 3301 3302 3303
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3304 3305 3306 3307
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3308 3309 3310 3311 3312 3313 3314 3315 3316
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3317
 *	@readid_flags: read ID flags
3318 3319 3320 3321 3322 3323 3324 3325 3326 3327
 *
 *	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
 */
3328
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3329
{
3330
	unsigned int class = dev->class;
3331
	u16 *id = (void *)dev->ap->sector_buf;
3332 3333
	int rc;

3334 3335 3336 3337
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3338

3339
	/* read ID data */
3340
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3341 3342 3343 3344
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3345
	if (!ata_dev_same_device(dev, class, id)) {
3346 3347 3348 3349
		rc = -ENODEV;
		goto fail;
	}

3350
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3351 3352

	/* configure device according to the new ID */
3353
	rc = ata_dev_configure(dev);
3354 3355
	if (rc == 0)
		return 0;
3356 3357

 fail:
3358
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3359 3360 3361
	return rc;
}

3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399
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 },

3400
	/* Weird ATAPI devices */
3401 3402
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |
						ATA_HORKAGE_DMA_RW_ONLY },
3403

3404 3405 3406 3407 3408
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3409 3410
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3411 3412
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3413 3414
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3415 3416 3417 3418 3419
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
3420 3421 3422 3423 3424

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
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3425
};
3426

3427
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
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3428
{
T
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3429 3430
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3431
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3432

T
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3433 3434
	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
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3435

3436
	while (ad->model_num) {
T
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3437
		if (!strcmp(ad->model_num, model_num)) {
3438 3439
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3440
			if (!strcmp(ad->model_rev, model_rev))
3441
				return ad->horkage;
3442
		}
3443
		ad++;
3444
	}
L
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3445 3446 3447
	return 0;
}

3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459
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;
}

3460 3461 3462 3463
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3464 3465 3466 3467
 *	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...
3468 3469 3470 3471
 *
 *	LOCKING:
 *	None.
 */
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3472
static void ata_dev_xfermask(struct ata_device *dev)
L
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3473
{
T
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3474
	struct ata_port *ap = dev->ap;
J
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3475
	struct ata_host *host = ap->host;
3476
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3477

3478
	/* controller modes available */
3479 3480 3481
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3482
	/* drive modes available */
3483 3484 3485
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3486

3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497
	/*
	 *	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));
	}

3498 3499
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3500 3501
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3502
	}
3503

3504 3505
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3506 3507 3508
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3509
	}
3510

3511 3512 3513
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

3533 3534
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3535 3536 3537 3538 3539 3540
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3541 3542 3543
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3544
 *	LOCKING:
J
Jeff Garzik 已提交
3545
 *	PCI/etc. bus probe sem.
3546 3547 3548
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3549 3550
 */

T
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3551
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3552
{
3553
	struct ata_taskfile tf;
3554
	unsigned int err_mask;
L
Linus Torvalds 已提交
3555 3556 3557 3558

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

T
Tejun Heo 已提交
3559
	ata_tf_init(dev, &tf);
3560 3561 3562 3563 3564
	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
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3565

T
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3566
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
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3567

3568 3569
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
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3570 3571
}

3572 3573 3574
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3575 3576
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3577 3578
 *
 *	LOCKING:
3579 3580 3581 3582
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3583
 */
T
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3584 3585
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3586
{
3587
	struct ata_taskfile tf;
3588
	unsigned int err_mask;
3589 3590 3591

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3592
		return AC_ERR_INVALID;
3593 3594 3595 3596

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

T
Tejun Heo 已提交
3597
	ata_tf_init(dev, &tf);
3598 3599 3600 3601 3602
	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 */
3603

T
Tejun Heo 已提交
3604
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3605

3606 3607
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3608 3609
}

L
Linus Torvalds 已提交
3610
/**
J
Jeff Garzik 已提交
3611 3612 3613 3614
 *	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
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3615 3616
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3617
 *	spin_lock_irqsave(host lock)
L
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3618
 */
3619
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3620 3621
{
	struct ata_port *ap = qc->ap;
3622
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3623
	int dir = qc->dma_dir;
3624
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3625

3626 3627
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3628 3629

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3630
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3631

J
Jeff Garzik 已提交
3632
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3633

3634 3635 3636 3637 3638 3639 3640 3641
	/* 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) {
3642
		if (qc->n_elem)
3643
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3644 3645 3646 3647 3648 3649
		/* 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);
3650
			kunmap_atomic(addr, KM_IRQ0);
3651 3652
		}
	} else {
3653
		if (qc->n_elem)
3654
			dma_unmap_single(ap->dev,
3655 3656
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3657 3658 3659 3660 3661 3662
		/* 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
3663 3664

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3665
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3666 3667 3668 3669 3670 3671
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3672 3673 3674
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
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3675
 *	LOCKING:
J
Jeff Garzik 已提交
3676
 *	spin_lock_irqsave(host lock)
L
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3677 3678 3679 3680 3681
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3682 3683
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3684

3685
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3686
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3687 3688

	idx = 0;
3689
	ata_for_each_sg(sg, qc) {
L
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3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722
		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
3723 3724 3725 3726
 *	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
3727
 *	LOCKING:
J
Jeff Garzik 已提交
3728
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3729
 *
L
Linus Torvalds 已提交
3730 3731 3732 3733 3734 3735 3736 3737
 *	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 */

3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757
	/* some drives can only do ATAPI DMA on read/write */
	if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
		struct scsi_cmnd *cmd = qc->scsicmd;
		u8 *scsicmd = cmd->cmnd;

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

L
Linus Torvalds 已提交
3758 3759 3760 3761 3762 3763 3764 3765 3766
	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
3767 3768
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3769
 *	LOCKING:
J
Jeff Garzik 已提交
3770
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3771 3772 3773 3774 3775 3776 3777 3778 3779
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3780 3781
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3782 3783 3784 3785 3786 3787 3788 3789 3790 3791
/**
 *	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
3792
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3793 3794
 */

L
Linus Torvalds 已提交
3795 3796 3797 3798
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3799
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3800
	qc->n_elem = 1;
3801
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3802
	qc->buf_virt = buf;
3803
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3804

3805
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3806 3807
}

J
Jeff Garzik 已提交
3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818
/**
 *	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
3819
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3820 3821
 */

L
Linus Torvalds 已提交
3822 3823 3824 3825
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3826
	qc->__sg = sg;
L
Linus Torvalds 已提交
3827
	qc->n_elem = n_elem;
3828
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3829 3830 3831
}

/**
J
Jeff Garzik 已提交
3832 3833 3834 3835
 *	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
3836 3837
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3838
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3839 3840
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3841
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3842 3843 3844 3845 3846 3847
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3848
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3849
	dma_addr_t dma_address;
3850
	int trim_sg = 0;
L
Linus Torvalds 已提交
3851

3852 3853 3854 3855 3856 3857
	/* 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;

3858
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869

		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;
3870 3871
		if (sg->length == 0)
			trim_sg = 1;
3872 3873 3874 3875 3876

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

3877 3878
	if (trim_sg) {
		qc->n_elem--;
3879 3880 3881
		goto skip_map;
	}

3882
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3883
				     sg->length, dir);
3884 3885 3886
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3887
		return -1;
3888
	}
L
Linus Torvalds 已提交
3889 3890

	sg_dma_address(sg) = dma_address;
3891
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3892

3893
skip_map:
L
Linus Torvalds 已提交
3894 3895 3896 3897 3898 3899 3900
	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
3901 3902 3903 3904
 *	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
3905 3906
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3907
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3908 3909
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3910
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3911 3912 3913 3914 3915 3916
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3917 3918
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3919
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3920

T
Tejun Heo 已提交
3921
	VPRINTK("ENTER, ata%u\n", ap->print_id);
3922
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3923

3924 3925 3926 3927 3928 3929 3930
	/* 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;

3931
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945

		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);
3946
			kunmap_atomic(addr, KM_IRQ0);
3947 3948 3949 3950 3951 3952
		}

		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;
3953 3954
		if (lsg->length == 0)
			trim_sg = 1;
3955 3956 3957 3958 3959

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

3960 3961 3962 3963 3964 3965 3966 3967 3968
	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
3969
	dir = qc->dma_dir;
3970
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3971 3972 3973
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3974
		return -1;
3975
	}
L
Linus Torvalds 已提交
3976 3977 3978

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

3979
skip_map:
L
Linus Torvalds 已提交
3980 3981 3982 3983 3984
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3985
/**
3986
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3987 3988 3989 3990 3991 3992 3993 3994
 *	@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
3995
 *	Inherited from caller.
E
Edward Falk 已提交
3996
 */
L
Linus Torvalds 已提交
3997 3998 3999 4000 4001 4002 4003 4004 4005 4006
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
4007
/**
T
Tejun Heo 已提交
4008
 *	ata_data_xfer - Transfer data by PIO
4009
 *	@adev: device to target
A
Albert Lee 已提交
4010 4011
 *	@buf: data buffer
 *	@buflen: buffer length
4012
 *	@write_data: read/write
A
Albert Lee 已提交
4013 4014 4015 4016 4017 4018
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4019 4020
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4021
{
4022
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4023
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4024

A
Albert Lee 已提交
4025
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4026
	if (write_data)
T
Tejun Heo 已提交
4027
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4028
	else
T
Tejun Heo 已提交
4029
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4030 4031 4032 4033 4034 4035 4036 4037

	/* 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
4038
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4039
		} else {
T
Tejun Heo 已提交
4040
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4041 4042 4043
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4044 4045
}

4046
/**
T
Tejun Heo 已提交
4047
 *	ata_data_xfer_noirq - Transfer data by PIO
4048 4049 4050 4051 4052
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4053
 *	Transfer data from/to the device data register by PIO. Do the
4054 4055 4056 4057 4058
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4059 4060
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4061 4062 4063
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4064
	ata_data_xfer(adev, buf, buflen, write_data);
4065 4066 4067 4068
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4069 4070 4071 4072 4073 4074 4075 4076 4077 4078
/**
 *	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
4079 4080 4081
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4082
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4083 4084 4085 4086 4087
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
4088
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
4089
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4090 4091

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4092
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4093 4094 4095 4096 4097 4098 4099

	/* 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");

4100 4101 4102
	if (PageHighMem(page)) {
		unsigned long flags;

4103
		/* FIXME: use a bounce buffer */
4104 4105
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4106

4107
		/* do the actual data transfer */
4108
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
4109

4110 4111 4112 4113
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4114
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
4115
	}
L
Linus Torvalds 已提交
4116

T
Tejun Heo 已提交
4117 4118
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
4119

T
Tejun Heo 已提交
4120
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4121 4122 4123 4124 4125
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4126 4127 4128 4129
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
4130
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
4131 4132 4133 4134 4135
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4136

4137 4138 4139 4140 4141 4142
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
4143
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4144

T
Tejun Heo 已提交
4145 4146
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
4147 4148 4149 4150 4151 4152
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168
/**
 *	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");
4169
	WARN_ON(qc->dev->cdb_len < 12);
4170

4171
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186
	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
4187 4188
}

A
Albert Lee 已提交
4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200
/**
 *	__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
4201 4202 4203
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4204
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4205 4206 4207 4208 4209
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4210
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4211
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4212 4213

next_sg:
4214
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4215
		/*
4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226
		 * 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 */
4227 4228
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4229 4230

		for (i = 0; i < words; i++)
4231
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4232

A
Albert Lee 已提交
4233
		ap->hsm_task_state = HSM_ST_LAST;
4234 4235 4236
		return;
	}

4237
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4238 4239 4240 4241 4242 4243 4244 4245

	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;

4246
	/* don't overrun current sg */
4247
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4248 4249 4250 4251

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

4252 4253
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4254 4255 4256
	if (PageHighMem(page)) {
		unsigned long flags;

4257
		/* FIXME: use bounce buffer */
4258 4259
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4260

4261
		/* do the actual data transfer */
4262
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4263

4264 4265 4266 4267
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4268
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4269
	}
L
Linus Torvalds 已提交
4270 4271 4272 4273 4274

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

4275
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4276 4277 4278 4279
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4280
	if (bytes)
L
Linus Torvalds 已提交
4281 4282 4283
		goto next_sg;
}

A
Albert Lee 已提交
4284 4285 4286 4287 4288 4289 4290 4291 4292 4293
/**
 *	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
4294 4295 4296 4297 4298 4299 4300
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;

4301 4302 4303 4304 4305 4306 4307 4308 4309 4310
	/* 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
4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321
	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
4322
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4323

L
Linus Torvalds 已提交
4324 4325 4326 4327 4328
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4329
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4330
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4331
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4332 4333 4334
}

/**
4335 4336 4337
 *	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
4338
 *
4339 4340
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4341
 */
4342 4343

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4344
{
4345 4346
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4347

4348 4349 4350 4351
	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
4352

4353 4354 4355
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4356 4357
	}

4358 4359
	return 0;
}
L
Linus Torvalds 已提交
4360

T
Tejun Heo 已提交
4361 4362 4363 4364 4365 4366 4367 4368
/**
 *	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
4369
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4370 4371 4372 4373 4374 4375 4376 4377 4378
 *	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) {
4379
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4380

J
Jeff Garzik 已提交
4381 4382
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4383 4384 4385 4386
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4387
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4388 4389 4390 4391 4392
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4393
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4394 4395 4396 4397 4398 4399 4400 4401
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4402
			spin_lock_irqsave(ap->lock, flags);
4403
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4404
			ata_qc_complete(qc);
4405
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4406 4407 4408
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4409

4410
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4411 4412
}

4413 4414 4415 4416 4417 4418 4419 4420 4421 4422
/**
 *	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.
 */
4423 4424
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4425
{
4426 4427 4428
	unsigned long flags = 0;
	int poll_next;

4429 4430
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4431 4432 4433 4434
	/* 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).
	 */
4435
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4436

4437
fsm_start:
4438
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4439
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4440

4441 4442
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4443 4444 4445 4446 4447 4448 4449 4450
		/* 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);

4451
		/* check device status */
4452 4453 4454 4455 4456 4457 4458 4459 4460
		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
4461
			ap->hsm_task_state = HSM_ST_ERR;
4462
			goto fsm_start;
L
Linus Torvalds 已提交
4463 4464
		}

4465 4466
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4467 4468 4469
		 * 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.
4470 4471
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4472 4473
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4474
			qc->err_mask |= AC_ERR_HSM;
4475 4476
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4477
		}
L
Linus Torvalds 已提交
4478

4479 4480 4481 4482 4483 4484
		/* 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)
4485
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4486

4487 4488 4489 4490
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4491

4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503
			/* 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)
4504
			spin_unlock_irqrestore(ap->lock, flags);
4505 4506 4507 4508

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4509
		break;
4510

4511 4512 4513 4514 4515
	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) {
4516 4517 4518
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4519 4520 4521
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4522

4523 4524
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4525 4526 4527
			 * 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.
4528 4529
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4530 4531 4532
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4533
				qc->err_mask |= AC_ERR_HSM;
4534 4535
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4536
			}
L
Linus Torvalds 已提交
4537

4538
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4539

4540 4541 4542
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4543

4544 4545 4546 4547
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4548 4549 4550 4551
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4552 4553 4554 4555 4556 4557
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4558

4559 4560 4561
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4562

4563 4564 4565 4566 4567 4568 4569 4570 4571
			/* 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.
4572 4573 4574 4575
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4576 4577 4578 4579 4580 4581 4582

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

4583 4584 4585
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4586 4587 4588 4589 4590 4591
				/* 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;
4592 4593
			}

4594 4595 4596 4597 4598 4599
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4600
				status = ata_wait_idle(ap);
4601 4602 4603 4604 4605
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4606
		poll_next = 1;
L
Linus Torvalds 已提交
4607 4608
		break;

A
Albert Lee 已提交
4609
	case HSM_ST_LAST:
4610 4611
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4612 4613 4614 4615 4616
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4617
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4618
			ap->print_id, qc->dev->devno, status);
4619

4620 4621
		WARN_ON(qc->err_mask);

4622
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4623

4624
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4625
		ata_hsm_qc_complete(qc, in_wq);
4626 4627

		poll_next = 0;
L
Linus Torvalds 已提交
4628 4629
		break;

A
Albert Lee 已提交
4630
	case HSM_ST_ERR:
4631 4632 4633 4634 4635 4636
		/* 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;
4637

4638
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4639
		ata_hsm_qc_complete(qc, in_wq);
4640 4641

		poll_next = 0;
4642 4643
		break;
	default:
4644
		poll_next = 0;
4645
		BUG();
L
Linus Torvalds 已提交
4646 4647
	}

4648
	return poll_next;
L
Linus Torvalds 已提交
4649 4650
}

4651
static void ata_pio_task(struct work_struct *work)
4652
{
4653 4654 4655
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4656
	u8 status;
4657
	int poll_next;
4658

J
Jeff Garzik 已提交
4659
fsm_start:
4660
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4661

4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673
	/*
	 * 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) {
4674
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4675 4676
			return;
		}
4677 4678
	}

4679 4680
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4681

4682 4683 4684 4685
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4686
		goto fsm_start;
4687 4688
}

L
Linus Torvalds 已提交
4689 4690 4691 4692 4693 4694
/**
 *	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
4695
 *	None.
L
Linus Torvalds 已提交
4696 4697 4698 4699 4700 4701 4702
 */

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

4703
	/* no command while frozen */
4704
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4705 4706
		return NULL;

4707 4708
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4709
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4710
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724
			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
4725
 *	None.
L
Linus Torvalds 已提交
4726 4727
 */

T
Tejun Heo 已提交
4728
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4729
{
T
Tejun Heo 已提交
4730
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4731 4732 4733 4734 4735 4736 4737 4738
	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
4739
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752
	}

	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
4753
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4754 4755 4756
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4757 4758 4759
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4760
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4761

4762 4763 4764 4765
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4766
		clear_bit(tag, &ap->qc_allocated);
4767
	}
L
Linus Torvalds 已提交
4768 4769
}

4770
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4771
{
4772 4773
	struct ata_port *ap = qc->ap;

4774 4775
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4776 4777 4778 4779

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

4780
	/* command should be marked inactive atomically with qc completion */
4781 4782 4783 4784
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4785

4786 4787 4788 4789 4790
	/* 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;
4791
	ap->qc_active &= ~(1 << qc->tag);
4792

L
Linus Torvalds 已提交
4793
	/* call completion callback */
4794
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4795 4796
}

4797 4798 4799 4800 4801
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4802
	ap->ops->tf_read(ap, &qc->result_tf);
4803 4804
}

4805 4806 4807 4808 4809 4810 4811 4812 4813
/**
 *	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
4814
 *	spin_lock_irqsave(host lock)
4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833
 */
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) {
4834
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4835 4836 4837 4838 4839 4840 4841

		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 */
4842
				fill_result_tf(qc);
4843 4844 4845 4846 4847 4848 4849
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4850
			fill_result_tf(qc);
4851 4852 4853 4854 4855 4856 4857 4858

		__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)
4859
			fill_result_tf(qc);
4860 4861 4862 4863 4864

		__ata_qc_complete(qc);
	}
}

4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876
/**
 *	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
4877
 *	spin_lock_irqsave(host lock)
4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913
 *
 *	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
4914 4915 4916 4917 4918
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4919
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947
	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
4948
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4949
 */
4950
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4951 4952 4953
{
	struct ata_port *ap = qc->ap;

4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967
	/* 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;
	}

4968
	qc->flags |= ATA_QCFLAG_ACTIVE;
4969
	ap->qc_active |= 1 << qc->tag;
4970

L
Linus Torvalds 已提交
4971 4972 4973
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4974
				goto sg_err;
L
Linus Torvalds 已提交
4975 4976
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4977
				goto sg_err;
L
Linus Torvalds 已提交
4978 4979 4980 4981 4982 4983 4984
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4985 4986 4987 4988
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4989

4990 4991
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4992 4993 4994
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005
}

/**
 *	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
5006 5007
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5008
 *	LOCKING:
J
Jeff Garzik 已提交
5009
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5010 5011
 *
 *	RETURNS:
5012
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5013 5014
 */

5015
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5016 5017 5018
{
	struct ata_port *ap = qc->ap;

5019 5020 5021 5022 5023 5024
	/* 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:
5025
		case ATA_PROT_NODATA:
5026 5027 5028 5029 5030 5031
		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)
5032
				/* see ata_dma_blacklisted() */
5033 5034 5035 5036 5037 5038 5039
				BUG();
			break;
		default:
			break;
		}
	}

5040 5041 5042 5043 5044 5045 5046 5047
	/* 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;

5048
	/* select the device */
L
Linus Torvalds 已提交
5049 5050
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5051
	/* start the command */
L
Linus Torvalds 已提交
5052 5053
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5054 5055 5056
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5057
		ata_tf_to_host(ap, &qc->tf);
5058 5059 5060
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5061
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5062

L
Linus Torvalds 已提交
5063 5064 5065
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5066
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5067

L
Linus Torvalds 已提交
5068 5069 5070
		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 */
5071
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5072 5073
		break;

5074 5075 5076
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5077

J
Jeff Garzik 已提交
5078
		ata_tf_to_host(ap, &qc->tf);
5079

5080 5081 5082
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5083
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5084 5085

			/* always send first data block using
5086
			 * the ata_pio_task() codepath.
5087
			 */
5088
		} else {
5089 5090 5091 5092
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5093
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5094 5095 5096 5097

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5098 5099
		}

L
Linus Torvalds 已提交
5100 5101 5102 5103
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5104 5105 5106
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5107
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5108

5109 5110 5111 5112 5113
		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))
5114
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5115 5116 5117
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5118
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5119

L
Linus Torvalds 已提交
5120 5121
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5122 5123 5124 5125
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5126
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5127 5128 5129 5130
		break;

	default:
		WARN_ON(1);
5131
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146
	}

	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
5147
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5148 5149 5150 5151 5152 5153 5154 5155
 *
 *	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)
{
5156
	struct ata_eh_info *ehi = &ap->eh_info;
5157
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5158

5159
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5160
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5161

5162 5163 5164
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5165 5166 5167
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5168

5169 5170 5171 5172 5173
		/* 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
5174 5175
			goto idle_irq;
		break;
5176 5177 5178 5179 5180
	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
5181 5182
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5183 5184 5185 5186 5187 5188 5189

			/* 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);
5190 5191 5192 5193 5194 5195

			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;
			}
5196 5197 5198 5199
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5200 5201 5202 5203
	default:
		goto idle_irq;
	}

5204 5205 5206 5207
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5208

5209 5210 5211 5212
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5213

5214 5215
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5216

5217
	ata_hsm_move(ap, qc, status, 0);
5218 5219 5220 5221 5222

	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
5223 5224 5225 5226 5227 5228 5229
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5230
		ap->ops->irq_ack(ap, 0); /* debug trap */
5231
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5232
		return 1;
L
Linus Torvalds 已提交
5233 5234 5235 5236 5237 5238 5239
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5240
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5241
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5242
 *
J
Jeff Garzik 已提交
5243 5244 5245
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5246
 *	LOCKING:
J
Jeff Garzik 已提交
5247
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5248 5249
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5250
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5251 5252
 */

5253
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5254
{
J
Jeff Garzik 已提交
5255
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5256 5257 5258 5259 5260
	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
5261
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5262

J
Jeff Garzik 已提交
5263
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5264 5265
		struct ata_port *ap;

J
Jeff Garzik 已提交
5266
		ap = host->ports[i];
5267
		if (ap &&
J
Jeff Garzik 已提交
5268
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5269 5270 5271
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5272
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5273
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5274 5275 5276 5277
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5278
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5279 5280 5281 5282

	return IRQ_RETVAL(handled);
}

5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419
/**
 *	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
5420

5421
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5422
{
5423
	unsigned int err_mask;
J
Jens Axboe 已提交
5424 5425 5426 5427 5428
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5429
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5430 5431 5432 5433
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5434 5435 5436 5437 5438 5439 5440
	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
5441 5442
}

5443
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5444 5445 5446
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5447 5448 5449 5450
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5451 5452
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491

		/* 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
5492 5493
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5494 5495
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5496
 *	Suspend @host.  Actual operation is performed by EH.  This
5497 5498 5499 5500 5501 5502 5503 5504 5505
 *	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
5506
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5507 5508 5509
{
	int i, j, rc;

J
Jeff Garzik 已提交
5510
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5511 5512 5513 5514 5515 5516 5517
	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
5518 5519
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533

		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
5534
	host->dev->power.power_state = mesg;
5535 5536 5537
	return 0;

 fail:
J
Jeff Garzik 已提交
5538
	ata_host_resume(host);
5539 5540 5541 5542
	return rc;
}

/**
J
Jeff Garzik 已提交
5543 5544
 *	ata_host_resume - resume host
 *	@host: host to resume
5545
 *
J
Jeff Garzik 已提交
5546
 *	Resume @host.  Actual operation is performed by EH.  This
5547 5548 5549 5550 5551 5552
 *	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
5553
void ata_host_resume(struct ata_host *host)
5554
{
J
Jeff Garzik 已提交
5555 5556 5557
	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;
5558
}
5559
#endif
5560

5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572
/**
 *	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.
 */
5573
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5574
{
5575
	struct device *dev = ap->dev;
5576
	int rc;
L
Linus Torvalds 已提交
5577

5578 5579
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5580 5581 5582
	if (!ap->prd)
		return -ENOMEM;

5583
	rc = ata_pad_alloc(ap, dev);
5584
	if (rc)
5585
		return rc;
L
Linus Torvalds 已提交
5586

5587 5588
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5589 5590 5591
	return 0;
}

5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603
/**
 *	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;
5604 5605
	unsigned long flags;

5606 5607 5608
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5609 5610
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5611
	 * host lock.
5612
	 */
5613
	spin_lock_irqsave(ap->lock, flags);
5614
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5615
	spin_unlock_irqrestore(ap->lock, flags);
5616

5617 5618
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5619 5620 5621 5622 5623
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5624
/**
B
Brian King 已提交
5625
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5626
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5627
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5628 5629 5630
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5631
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5632
 *
L
Linus Torvalds 已提交
5633
 *	LOCKING:
J
Jeff Garzik 已提交
5634
 *	Inherited from caller.
L
Linus Torvalds 已提交
5635
 */
J
Jeff Garzik 已提交
5636
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5637
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5638 5639 5640
{
	unsigned int i;

J
Jeff Garzik 已提交
5641
	ap->lock = &host->lock;
5642
	ap->flags = ATA_FLAG_DISABLED;
T
Tejun Heo 已提交
5643
	ap->print_id = ata_print_id++;
L
Linus Torvalds 已提交
5644
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5645
	ap->host = host;
5646
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5647
	ap->port_no = port_no;
5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660
	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;
	}
5661
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5662 5663
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5664 5665 5666 5667 5668 5669

#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
5670
#else
5671
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5672
#endif
L
Linus Torvalds 已提交
5673

5674 5675 5676
	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);
5677
	INIT_LIST_HEAD(&ap->eh_done_q);
5678
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5679

5680 5681 5682 5683 5684
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5685 5686
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5687
		dev->ap = ap;
5688
		dev->devno = i;
5689
		ata_dev_init(dev);
5690
	}
L
Linus Torvalds 已提交
5691 5692 5693 5694 5695 5696 5697 5698 5699

#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
5700
/**
5701 5702 5703
 *	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
5704
 *
5705
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5706 5707 5708 5709
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5710
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5711
{
J
Jeff Garzik 已提交
5712
	ap->scsi_host = shost;
B
Brian King 已提交
5713

T
Tejun Heo 已提交
5714
	shost->unique_id = ap->print_id;
5715 5716 5717
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
5718
	shost->max_cmd_len = 16;
B
Brian King 已提交
5719 5720
}

L
Linus Torvalds 已提交
5721
/**
5722
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5723
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5724
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5725 5726
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5727 5728
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5729
 *	LOCKING:
J
Jeff Garzik 已提交
5730
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5731 5732
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5733
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5734
 */
5735
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5736
				      struct ata_host *host,
L
Linus Torvalds 已提交
5737 5738
				      unsigned int port_no)
{
5739
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5740 5741 5742
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5743

5744
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5745
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5746 5747 5748 5749 5750
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5751 5752
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5753 5754
		return NULL;

5755
	shost->transportt = &ata_scsi_transport_template;
5756

5757
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5758

J
Jeff Garzik 已提交
5759
	ata_port_init(ap, host, ent, port_no);
5760
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5761 5762 5763 5764

	return ap;
}

5765 5766 5767 5768 5769 5770 5771 5772
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];

5773
		if (ap && ap->ops->port_stop)
5774 5775 5776 5777 5778
			ap->ops->port_stop(ap);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
5779

5780 5781 5782 5783 5784 5785 5786 5787 5788
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

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

		host->ports[i] = NULL;
	}

5789
	dev_set_drvdata(gendev, NULL);
5790 5791
}

5792
/**
J
Jeff Garzik 已提交
5793 5794 5795 5796 5797
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5798 5799 5800 5801 5802 5803
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5804 5805
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5806
{
J
Jeff Garzik 已提交
5807 5808 5809 5810
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5811 5812
}

L
Linus Torvalds 已提交
5813
/**
J
Jeff Garzik 已提交
5814 5815 5816 5817 5818 5819 5820 5821 5822 5823
 *	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
5824 5825
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5826
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5827 5828
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5829
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5830
 */
J
Jeff Garzik 已提交
5831
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5832
{
5833
	unsigned int i;
L
Linus Torvalds 已提交
5834
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5835
	struct ata_host *host;
5836
	int rc;
L
Linus Torvalds 已提交
5837 5838

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5839

5840 5841 5842 5843
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5844 5845 5846 5847

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

L
Linus Torvalds 已提交
5848
	/* alloc a container for our list of ATA ports (buses) */
5849 5850
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5851
	if (!host)
5852 5853 5854
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5855

J
Jeff Garzik 已提交
5856 5857 5858 5859
	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
5860
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5861
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5862 5863

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5864
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5865 5866
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5867
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5868

J
Jeff Garzik 已提交
5869
		ap = ata_port_add(ent, host, i);
5870
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5871 5872 5873
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5874 5875 5876 5877 5878 5879 5880 5881 5882 5883
		/* 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
5884 5885
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5886 5887 5888
			goto err_out;
		}

5889 5890 5891 5892
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5893 5894 5895 5896 5897
		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
5898 5899
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5900 5901 5902 5903 5904
				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,
5905
				irq_line);
L
Linus Torvalds 已提交
5906

5907 5908
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5909 5910
	}

5911
	/* obtain irq, that may be shared between channels */
5912 5913
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5914 5915 5916
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5917
		goto err_out;
5918
	}
L
Linus Torvalds 已提交
5919

5920 5921 5922 5923 5924 5925
	/* 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);

5926 5927 5928
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5929 5930 5931
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5932
			goto err_out;
5933 5934 5935
		}
	}

5936
	/* resource acquisition complete */
T
Tejun Heo 已提交
5937
	devres_remove_group(dev, ata_device_add);
5938

L
Linus Torvalds 已提交
5939 5940
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5941 5942
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5943
		u32 scontrol;
L
Linus Torvalds 已提交
5944 5945
		int rc;

5946 5947 5948 5949 5950 5951 5952
		/* 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
5953
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5954
		if (rc) {
5955
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5956 5957 5958 5959 5960 5961
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5962

5963
		if (ap->ops->error_handler) {
5964
			struct ata_eh_info *ehi = &ap->eh_info;
5965 5966 5967 5968 5969
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5970
			spin_lock_irqsave(ap->lock, flags);
5971

5972 5973 5974
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5975

5976
			ap->pflags |= ATA_PFLAG_LOADING;
5977 5978
			ata_port_schedule_eh(ap);

5979
			spin_unlock_irqrestore(ap->lock, flags);
5980 5981 5982 5983

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
T
Tejun Heo 已提交
5984
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5985
			rc = ata_bus_probe(ap);
T
Tejun Heo 已提交
5986
			DPRINTK("ata%u: bus probe end\n", ap->print_id);
5987 5988 5989 5990 5991 5992 5993 5994 5995 5996

			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
5997 5998 5999
	}

	/* probes are done, now scan each port's disk(s) */
6000
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
6001 6002
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
6003

J
Jeff Garzik 已提交
6004
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
6005 6006 6007 6008 6009
	}

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

6010 6011 6012
 err_out:
	devres_release_group(dev, ata_device_add);
	VPRINTK("EXIT, returning %d\n", rc);
L
Linus Torvalds 已提交
6013 6014 6015
	return 0;
}

6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032
/**
 *	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)
6033
		goto skip_eh;
6034 6035

	/* tell EH we're leaving & flush EH */
6036
	spin_lock_irqsave(ap->lock, flags);
6037
	ap->pflags |= ATA_PFLAG_UNLOADING;
6038
	spin_unlock_irqrestore(ap->lock, flags);
6039 6040 6041 6042 6043 6044

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6045
	spin_lock_irqsave(ap->lock, flags);
6046 6047 6048 6049

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

6050
	spin_unlock_irqrestore(ap->lock, flags);
6051 6052 6053 6054 6055

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6056
	spin_lock_irqsave(ap->lock, flags);
6057
	ata_port_freeze(ap);	/* won't be thawed */
6058
	spin_unlock_irqrestore(ap->lock, flags);
6059 6060 6061 6062 6063 6064 6065 6066 6067 6068

	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);

6069
 skip_eh:
6070
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6071
	scsi_remove_host(ap->scsi_host);
6072 6073
}

T
Tejun Heo 已提交
6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090
/**
 *	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]);
}

6091 6092 6093 6094 6095
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

6096
	probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
6097 6098 6099 6100 6101 6102 6103 6104 6105 6106
	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
6107
	probe_ent->port_flags = port->flags;
6108 6109 6110 6111
	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;
6112
	probe_ent->private_data = port->private_data;
6113 6114 6115 6116

	return probe_ent;
}

L
Linus Torvalds 已提交
6117 6118 6119
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6120 6121 6122 6123 6124 6125 6126
 *
 *	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
6127
 */
E
Edward Falk 已提交
6128

L
Linus Torvalds 已提交
6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142
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
6143

6144 6145
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6146 6147 6148 6149
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6150 6151 6152
 *	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
6153 6154 6155 6156
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6157
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6158 6159
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6160
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6161

T
Tejun Heo 已提交
6162
	ata_host_detach(host);
L
Linus Torvalds 已提交
6163 6164 6165
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6166
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197
{
	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
6198

6199
#ifdef CONFIG_PM
6200
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6201 6202
{
	pci_save_state(pdev);
6203
	pci_disable_device(pdev);
6204

6205
	if (mesg.event == PM_EVENT_SUSPEND)
6206
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6207 6208
}

6209
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6210
{
6211 6212
	int rc;

J
Jens Axboe 已提交
6213 6214
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6215

T
Tejun Heo 已提交
6216
	rc = pcim_enable_device(pdev);
6217 6218 6219 6220 6221 6222
	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
6223
	pci_set_master(pdev);
6224
	return 0;
6225 6226
}

6227
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6228
{
J
Jeff Garzik 已提交
6229
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6230 6231
	int rc = 0;

J
Jeff Garzik 已提交
6232
	rc = ata_host_suspend(host, mesg);
6233 6234 6235
	if (rc)
		return rc;

6236
	ata_pci_device_do_suspend(pdev, mesg);
6237 6238 6239 6240 6241 6242

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6243
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6244
	int rc;
6245

6246 6247 6248 6249
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6250
}
6251 6252
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6253 6254 6255 6256 6257
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6258
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6259 6260 6261 6262
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6263 6264 6265 6266 6267 6268
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6269 6270 6271 6272 6273 6274 6275
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6276
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6277 6278
}

6279
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6280 6281
module_exit(ata_exit);

6282
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6283
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302

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;
}

6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348
/**
 *	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
6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381
/*
 * 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
6382 6383 6384 6385 6386 6387 6388
/*
 * 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.
 */

6389 6390 6391
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
6392
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6393 6394
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6395
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6396
EXPORT_SYMBOL_GPL(ata_device_add);
T
Tejun Heo 已提交
6397
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6398 6399
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6400
EXPORT_SYMBOL_GPL(ata_hsm_move);
6401
EXPORT_SYMBOL_GPL(ata_qc_complete);
6402
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6403 6404 6405 6406 6407
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);
6408
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6409 6410 6411 6412 6413 6414 6415
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
6416 6417
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6418
EXPORT_SYMBOL_GPL(ata_qc_prep);
6419
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6420 6421 6422 6423 6424
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);
6425 6426 6427 6428 6429
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
6430
EXPORT_SYMBOL_GPL(ata_port_probe);
6431
EXPORT_SYMBOL_GPL(ata_dev_disable);
6432
EXPORT_SYMBOL_GPL(sata_set_spd);
6433 6434
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6435 6436 6437
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6438
EXPORT_SYMBOL_GPL(ata_std_prereset);
6439
EXPORT_SYMBOL_GPL(ata_std_softreset);
6440
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6441 6442
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6443 6444
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6445
EXPORT_SYMBOL_GPL(ata_port_disable);
6446
EXPORT_SYMBOL_GPL(ata_ratelimit);
6447
EXPORT_SYMBOL_GPL(ata_wait_register);
6448
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6449
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6450 6451 6452
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6453
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6454
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6455
EXPORT_SYMBOL_GPL(ata_host_intr);
6456 6457 6458 6459 6460 6461
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);
6462
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6463 6464
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6465
#endif /* CONFIG_PM */
6466 6467
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6468
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6469
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6470 6471
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6472
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6473 6474 6475
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6476 6477 6478 6479 6480
#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);
6481
#ifdef CONFIG_PM
6482 6483
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6484 6485
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6486
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6487 6488
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6489
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6490

6491
#ifdef CONFIG_PM
J
Jens Axboe 已提交
6492 6493
EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6494
#endif /* CONFIG_PM */
6495 6496

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6497 6498
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6499 6500 6501
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6502 6503
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6504
EXPORT_SYMBOL_GPL(ata_do_eh);
6505 6506 6507 6508
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
6509
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6510 6511 6512 6513 6514

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