libata-core.c 152.6 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

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

#include "libata.h"

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


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

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

	if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
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			   ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ &&
	    likely(tag != ATA_TAG_INTERNAL)) {
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		/* yay, NCQ */
		if (!lba_48_ok(block, n_block))
			return -ERANGE;

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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/**
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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)
689
 *	@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.
702 703 704
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

707 708
static unsigned int
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
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{
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

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

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

	ap->ops->tf_read(ap, &tf);
719
	err = tf.feature;
720 721
	if (r_err)
		*r_err = err;
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723 724 725 726 727
	/* 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
732
		return ATA_DEV_NONE;
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734
	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
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	if (class == ATA_DEV_UNKNOWN)
738
		return ATA_DEV_NONE;
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	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
740 741
		return ATA_DEV_NONE;
	return class;
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}

/**
745
 *	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.
 */

759 760
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;
	}
}

778
/**
779
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
780 781 782 783 784
 *	@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.
 *
785
 *	This function is identical to ata_id_string except that it
786 787 788 789 790 791
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
792 793
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
794 795 796 797 798
{
	unsigned char *p;

	WARN_ON(!(len & 1));

799
	ata_id_string(id, s, ofs, len - 1);
800 801 802 803 804 805

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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

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

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

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

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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, ata%u: "
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				"device %u, wait %u\n", ap->id, device, wait);
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	if (wait)
		ata_wait_idle(ap);

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
907
 *	@id: IDENTIFY DEVICE page to dump
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 *
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 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

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

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

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
973
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
974 975 976 977
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
978 979 980 981 982 983 984 985 986 987

		/* 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;
988

989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
	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);
	}

1006 1007 1008
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1009 1010 1011 1012

	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
1016
 *	@fn: workqueue function to be scheduled
1017
 *	@data: data for @fn to use
1018
 *	@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.
 */
1032
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
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			 unsigned long delay)
{
	int rc;

1037
	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
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		return;

1040 1041
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
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1043
	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");

1065
	spin_lock_irqsave(ap->lock, flags);
1066
	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
1067
	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)) {
1078
		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);
	}

1084
	spin_lock_irqsave(ap->lock, flags);
1085
	ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
1086
	spin_unlock_irqrestore(ap->lock, flags);
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1088 1089
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
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}

1092
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1093
{
1094
	struct completion *waiting = qc->private_data;
1095 1096 1097 1098 1099

	complete(waiting);
}

/**
1100
 *	ata_exec_internal_sg - execute libata internal command
1101 1102
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1103
 *	@cdb: CDB for packet command
1104
 *	@dma_dir: Data tranfer direction of the command
1105 1106
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1107 1108 1109 1110 1111 1112 1113 1114 1115
 *
 *	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.
1116 1117 1118
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1119
 */
1120 1121 1122 1123
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)
1124
{
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	struct ata_port *ap = dev->ap;
1126 1127
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1128
	unsigned int tag, preempted_tag;
1129
	u32 preempted_sactive, preempted_qc_active;
1130
	DECLARE_COMPLETION_ONSTACK(wait);
1131
	unsigned long flags;
1132
	unsigned int err_mask;
1133
	int rc;
1134

1135
	spin_lock_irqsave(ap->lock, flags);
1136

1137
	/* no internal command while frozen */
1138
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1139
		spin_unlock_irqrestore(ap->lock, flags);
1140 1141 1142
		return AC_ERR_SYSTEM;
	}

1143
	/* initialize internal qc */
1144

1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	/* 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;

1155
	if (test_and_set_bit(tag, &ap->qc_allocated))
1156
		BUG();
1157
	qc = __ata_qc_from_tag(ap, tag);
1158 1159 1160 1161 1162 1163 1164 1165

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

	preempted_tag = ap->active_tag;
1166 1167
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1168
	ap->active_tag = ATA_TAG_POISON;
1169 1170
	ap->sactive = 0;
	ap->qc_active = 0;
1171 1172

	/* prepare & issue qc */
1173
	qc->tf = *tf;
1174 1175
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1176
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1177 1178
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1179 1180 1181 1182 1183 1184
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1185
		qc->nbytes = buflen;
1186 1187
	}

1188
	qc->private_data = &wait;
1189 1190
	qc->complete_fn = ata_qc_complete_internal;

1191
	ata_qc_issue(qc);
1192

1193
	spin_unlock_irqrestore(ap->lock, flags);
1194

A
Andrew Morton 已提交
1195
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1196 1197

	ata_port_flush_task(ap);
1198

1199
	if (!rc) {
1200
		spin_lock_irqsave(ap->lock, flags);
1201 1202 1203

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1204 1205
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1206
		 */
1207
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1208 1209 1210 1211 1212 1213
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1214

1215 1216
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1217
					"qc timeout (cmd 0x%x)\n", command);
1218 1219
		}

1220
		spin_unlock_irqrestore(ap->lock, flags);
1221 1222
	}

1223 1224 1225 1226
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

A
Alan 已提交
1227
	if ((qc->flags & ATA_QCFLAG_FAILED) && !qc->err_mask) {
1228
		if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1229
			ata_dev_printk(dev, KERN_WARNING,
1230
				"zero err_mask for failed "
T
Tejun Heo 已提交
1231
				"internal command, assuming AC_ERR_OTHER\n");
1232 1233 1234
		qc->err_mask |= AC_ERR_OTHER;
	}

1235
	/* finish up */
1236
	spin_lock_irqsave(ap->lock, flags);
1237

1238
	*tf = qc->result_tf;
1239 1240 1241
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1242
	ap->active_tag = preempted_tag;
1243 1244
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1245

1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	/* 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.
	 */
1257
	if (ap->flags & ATA_FLAG_DISABLED) {
1258 1259 1260 1261
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1262
	spin_unlock_irqrestore(ap->lock, flags);
1263

1264
	return err_mask;
1265 1266
}

1267
/**
1268
 *	ata_exec_internal - execute libata internal command
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
 *	@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)
{
1289 1290
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1291

1292 1293 1294 1295 1296 1297
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1298

1299
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1300 1301
}

1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
/**
 *	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
1315
 */
1316
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1317 1318 1319 1320 1321 1322 1323 1324 1325
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1326
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1327 1328
}

1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
/**
 *	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;
1346

1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
	/* 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
1362
/**
1363 1364 1365
 *	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)
1366
 *	@flags: ATA_READID_* flags
1367
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1368
 *
1369 1370
 *	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
1371 1372
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1373 1374
 *
 *	LOCKING:
1375 1376 1377 1378
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1379
 */
1380
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1381
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1382
{
T
Tejun Heo 已提交
1383
	struct ata_port *ap = dev->ap;
1384
	unsigned int class = *p_class;
1385
	struct ata_taskfile tf;
1386 1387 1388
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1389

1390
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1391 1392
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1393

1394
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1395

1396
 retry:
T
Tejun Heo 已提交
1397
	ata_tf_init(dev, &tf);
1398

1399 1400
	switch (class) {
	case ATA_DEV_ATA:
1401
		tf.command = ATA_CMD_ID_ATA;
1402 1403
		break;
	case ATA_DEV_ATAPI:
1404
		tf.command = ATA_CMD_ID_ATAPI;
1405 1406 1407 1408 1409
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1410 1411
	}

1412
	tf.protocol = ATA_PROT_PIO;
1413
	tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
L
Linus Torvalds 已提交
1414

T
Tejun Heo 已提交
1415
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1416
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1417
	if (err_mask) {
1418
		if (err_mask & AC_ERR_NODEV_HINT) {
1419 1420 1421 1422 1423
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
				ap->id, dev->devno);
			return -ENOENT;
		}

1424 1425
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1426 1427 1428
		goto err_out;
	}

1429
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1430

1431
	/* sanity check */
1432 1433 1434 1435 1436 1437 1438 1439 1440
	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;
1441 1442
	}

1443
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1444 1445 1446 1447 1448 1449 1450 1451 1452
		/*
		 * 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
1453
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1454 1455 1456 1457 1458 1459 1460 1461 1462
			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.
			 */
1463
			flags &= ~ATA_READID_POSTRESET;
1464 1465 1466 1467 1468
			goto retry;
		}
	}

	*p_class = class;
1469

1470 1471 1472
	return 0;

 err_out:
T
Tejun Heo 已提交
1473
	if (ata_msg_warn(ap))
1474
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1475
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1476 1477 1478
	return rc;
}

T
Tejun Heo 已提交
1479
static inline u8 ata_dev_knobble(struct ata_device *dev)
1480
{
T
Tejun Heo 已提交
1481
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1482 1483
}

1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
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;
	}
1494 1495 1496 1497
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1498
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1499
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1500 1501 1502 1503 1504 1505 1506 1507 1508
		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);
}

1509 1510 1511 1512
static void ata_set_port_max_cmd_len(struct ata_port *ap)
{
	int i;

J
Jeff Garzik 已提交
1513 1514 1515
	if (ap->scsi_host) {
		unsigned int len = 0;

1516
		for (i = 0; i < ATA_MAX_DEVICES; i++)
J
Jeff Garzik 已提交
1517 1518 1519
			len = max(len, ap->device[i].cdb_len);

		ap->scsi_host->max_cmd_len = len;
1520 1521 1522
	}
}

1523
/**
1524 1525 1526 1527 1528
 *	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.
1529 1530
 *
 *	LOCKING:
1531 1532 1533 1534
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1535
 */
1536
int ata_dev_configure(struct ata_device *dev)
1537
{
T
Tejun Heo 已提交
1538
	struct ata_port *ap = dev->ap;
1539
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1540
	const u16 *id = dev->id;
1541
	unsigned int xfer_mask;
1542
	char revbuf[7];		/* XYZ-99\0 */
1543 1544
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1545
	int rc;
1546

1547
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1548 1549 1550
		ata_dev_printk(dev, KERN_INFO,
			       "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
			       __FUNCTION__, ap->id, dev->devno);
1551
		return 0;
1552 1553
	}

1554
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1555 1556
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1557

1558
	/* print device capabilities */
1559
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1560 1561 1562
		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",
1563
			       __FUNCTION__,
1564 1565
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1566

1567
	/* initialize to-be-configured parameters */
1568
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1569 1570 1571 1572 1573 1574 1575
	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
1576 1577 1578 1579
	/*
	 * common ATA, ATAPI feature tests
	 */

1580
	/* find max transfer mode; for printk only */
1581
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1582

1583 1584
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1585 1586 1587

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1588 1589 1590 1591 1592 1593 1594 1595 1596
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
				ata_dev_printk(dev, KERN_WARNING, "ata%u: device %u  supports DRM functions and may not be fully accessable.\n",
					ap->id, dev->devno);
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1597
		dev->n_sectors = ata_id_n_sectors(id);
1598

1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV_OFS,
				sizeof(fwrevbuf));

		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD_OFS,
				sizeof(modelbuf));

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

1609
		if (ata_id_has_lba(id)) {
1610
			const char *lba_desc;
1611
			char ncq_desc[20];
1612

1613 1614
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1615
			if (ata_id_has_lba48(id)) {
1616
				dev->flags |= ATA_DFLAG_LBA48;
1617
				lba_desc = "LBA48";
1618 1619 1620 1621

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1622
			}
1623

1624 1625 1626
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1627
			/* print device info to dmesg */
1628 1629 1630 1631 1632 1633 1634
			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",
1635
					(unsigned long long)dev->n_sectors,
1636 1637
					dev->multi_count, lba_desc, ncq_desc);
			}
1638
		} else {
1639 1640 1641
			/* CHS */

			/* Default translation */
1642 1643 1644
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1645

1646
			if (ata_id_current_chs_valid(id)) {
1647
				/* Current CHS translation is valid. */
1648 1649 1650
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1651 1652 1653
			}

			/* print device info to dmesg */
1654
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1655
				ata_dev_printk(dev, KERN_INFO,
1656 1657 1658 1659 1660 1661 1662 1663 1664
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO, 
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1665 1666
		}

1667
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1668 1669 1670
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1671
	else if (dev->class == ATA_DEV_ATAPI) {
1672 1673
		char *cdb_intr_string = "";

1674
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1675
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1676
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1677 1678
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1679
			rc = -EINVAL;
L
Linus Torvalds 已提交
1680 1681
			goto err_out_nosup;
		}
1682
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1683

1684
		if (ata_id_cdb_intr(dev->id)) {
1685
			dev->flags |= ATA_DFLAG_CDB_INTR;
1686 1687
			cdb_intr_string = ", CDB intr";
		}
1688

L
Linus Torvalds 已提交
1689
		/* print device info to dmesg */
1690
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1691 1692 1693
			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
1694 1695
	}

1696 1697 1698 1699 1700
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
	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");
		}
	}

1713
	ata_set_port_max_cmd_len(ap);
1714

1715
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1716
	if (ata_dev_knobble(dev)) {
1717
		if (ata_msg_drv(ap) && print_info)
1718 1719
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1720
		dev->udma_mask &= ATA_UDMA5;
1721 1722 1723 1724 1725 1726
		dev->max_sectors = ATA_MAX_SECTORS;
	}

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

1727 1728 1729
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1730
	return 0;
L
Linus Torvalds 已提交
1731 1732

err_out_nosup:
1733
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1734 1735
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1736
	return rc;
L
Linus Torvalds 已提交
1737 1738 1739 1740 1741 1742
}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1743 1744 1745 1746
 *	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
1747
 *	LOCKING:
J
Jeff Garzik 已提交
1748
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1749 1750
 *
 *	RETURNS:
1751
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1752 1753
 */

1754
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1755
{
1756
	unsigned int classes[ATA_MAX_DEVICES];
1757 1758
	int tries[ATA_MAX_DEVICES];
	int i, rc, down_xfermask;
1759
	struct ata_device *dev;
L
Linus Torvalds 已提交
1760

1761
	ata_port_probe(ap);
1762

1763 1764 1765 1766 1767 1768
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
	down_xfermask = 0;

1769
	/* reset and determine device classes */
1770
	ap->ops->phy_reset(ap);
1771

1772 1773
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1774

1775 1776 1777 1778 1779
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1780

1781
		dev->class = ATA_DEV_UNKNOWN;
1782
	}
L
Linus Torvalds 已提交
1783

1784
	ata_port_probe(ap);
1785

A
Alan Cox 已提交
1786 1787 1788 1789 1790 1791
	/* 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;

1792
	/* read IDENTIFY page and configure devices */
L
Linus Torvalds 已提交
1793
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1794
		dev = &ap->device[i];
1795

1796 1797
		if (tries[i])
			dev->class = classes[i];
1798

1799
		if (!ata_dev_enabled(dev))
1800 1801
			continue;

1802 1803
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1804 1805 1806
		if (rc)
			goto fail;

1807 1808 1809
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1810 1811
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1812 1813
	}

1814
	/* configure transfer mode */
1815
	rc = ata_set_mode(ap, &dev);
1816 1817 1818
	if (rc) {
		down_xfermask = 1;
		goto fail;
1819
	}
L
Linus Torvalds 已提交
1820

1821 1822 1823
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1824

1825 1826
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1827
	ap->ops->port_disable(ap);
1828
	return -ENODEV;
1829 1830 1831 1832 1833 1834 1835 1836

 fail:
	switch (rc) {
	case -EINVAL:
	case -ENODEV:
		tries[dev->devno] = 0;
		break;
	case -EIO:
1837
		sata_down_spd_limit(ap);
1838 1839 1840 1841
		/* fall through */
	default:
		tries[dev->devno]--;
		if (down_xfermask &&
T
Tejun Heo 已提交
1842
		    ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1843 1844 1845
			tries[dev->devno] = 0;
	}

1846
	if (!tries[dev->devno]) {
T
Tejun Heo 已提交
1847 1848
		ata_down_xfermask_limit(dev, 1);
		ata_dev_disable(dev);
1849 1850
	}

1851
	goto retry;
L
Linus Torvalds 已提交
1852 1853 1854
}

/**
J
Jeff Garzik 已提交
1855 1856
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1857
 *
J
Jeff Garzik 已提交
1858 1859 1860
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1861
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1862
 *	serialization.
L
Linus Torvalds 已提交
1863 1864 1865 1866
 */

void ata_port_probe(struct ata_port *ap)
{
1867
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1868 1869
}

1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
/**
 *	sata_print_link_status - Print SATA link status
 *	@ap: SATA port to printk link status about
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
static void sata_print_link_status(struct ata_port *ap)
{
1881
	u32 sstatus, scontrol, tmp;
1882

1883
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1884
		return;
1885
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1886

1887
	if (ata_port_online(ap)) {
1888
		tmp = (sstatus >> 4) & 0xf;
1889 1890 1891
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1892
	} else {
1893 1894 1895
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1896 1897 1898
	}
}

L
Linus Torvalds 已提交
1899
/**
J
Jeff Garzik 已提交
1900 1901
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1902
 *
J
Jeff Garzik 已提交
1903 1904 1905
 *	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
1906 1907
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1908
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1909 1910 1911 1912 1913 1914 1915 1916
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1917
		/* issue phy wake/reset */
1918
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1919 1920 1921
		/* 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
1922
	}
1923 1924
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1925 1926 1927 1928

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1929
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1930 1931 1932 1933
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1934 1935
	/* print link status */
	sata_print_link_status(ap);
1936

1937
	/* TODO: phy layer with polling, timeouts, etc. */
1938
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
1939
		ata_port_probe(ap);
1940
	else
L
Linus Torvalds 已提交
1941 1942
		ata_port_disable(ap);

1943
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
		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
1955 1956
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1957
 *
J
Jeff Garzik 已提交
1958 1959
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
1960 1961
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1962
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1963 1964 1965 1966 1967
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
1968
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
1969 1970 1971 1972
		return;
	ata_bus_reset(ap);
}

1973 1974 1975 1976 1977 1978 1979
/**
 *	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
 */
1980

T
Tejun Heo 已提交
1981
struct ata_device *ata_dev_pair(struct ata_device *adev)
1982
{
T
Tejun Heo 已提交
1983
	struct ata_port *ap = adev->ap;
1984
	struct ata_device *pair = &ap->device[1 - adev->devno];
1985
	if (!ata_dev_enabled(pair))
1986 1987 1988 1989
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
1990
/**
J
Jeff Garzik 已提交
1991 1992
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
1993
 *
J
Jeff Garzik 已提交
1994 1995 1996 1997 1998
 *	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
1999
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2000
 *	serialization.
L
Linus Torvalds 已提交
2001 2002 2003 2004 2005 2006
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2007
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2008 2009
}

2010
/**
2011
 *	sata_down_spd_limit - adjust SATA spd limit downward
2012 2013 2014 2015
 *	@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
2016
 *	using sata_set_spd().
2017 2018 2019 2020 2021 2022 2023
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2024
int sata_down_spd_limit(struct ata_port *ap)
2025
{
2026 2027
	u32 sstatus, spd, mask;
	int rc, highbit;
2028

2029 2030 2031
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2032 2033 2034 2035 2036 2037 2038

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

2039
	spd = (sstatus >> 4) & 0xf;
2040 2041 2042 2043 2044 2045 2046 2047 2048
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2049 2050
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2051 2052 2053 2054

	return 0;
}

2055
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070
{
	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;
}

/**
2071
 *	sata_set_spd_needed - is SATA spd configuration needed
2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084
 *	@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.
 */
2085
int sata_set_spd_needed(struct ata_port *ap)
2086 2087 2088
{
	u32 scontrol;

2089
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2090 2091
		return 0;

2092
	return __sata_set_spd_needed(ap, &scontrol);
2093 2094 2095
}

/**
2096
 *	sata_set_spd - set SATA spd according to spd limit
2097 2098 2099 2100 2101 2102 2103 2104 2105
 *	@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
2106
 *	changed.  Negative errno if SCR registers are inaccessible.
2107
 */
2108
int sata_set_spd(struct ata_port *ap)
2109 2110
{
	u32 scontrol;
2111
	int rc;
2112

2113 2114
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2115

2116
	if (!__sata_set_spd_needed(ap, &scontrol))
2117 2118
		return 0;

2119 2120 2121
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2122 2123 2124
	return 1;
}

A
Alan Cox 已提交
2125 2126 2127 2128 2129
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2130
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2131
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2132 2133 2134
 * 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
2135 2136 2137 2138 2139 2140 2141 2142 2143
 */

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 },

2144 2145
	{ 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
2146 2147 2148 2149 2150
	{ 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 }, */
2151

A
Alan Cox 已提交
2152 2153 2154
	{ 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 },
2155

A
Alan Cox 已提交
2156 2157 2158 2159
	{ 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 },

2160 2161
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
A
Alan Cox 已提交
2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206
	{ 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
2207
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2208
			return NULL;
2209
	return t;
A
Alan Cox 已提交
2210 2211 2212 2213 2214 2215 2216 2217 2218
}

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;

	/*
2219
	 * Find the mode.
2220
	 */
A
Alan Cox 已提交
2221 2222 2223 2224

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

2225 2226
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246
	/*
	 * 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.
	 */

2247
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2248 2249

	/*
2250 2251 2252
	 * 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
2253 2254
	 */

2255
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2256 2257 2258 2259 2260
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2261
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276
	 */

	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;
}

2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
 *	@force_pio0: Force PIO0
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
T
Tejun Heo 已提交
2292
int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
{
	unsigned long xfer_mask;
	int highbit;

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

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

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

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

2316 2317
	ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
		       ata_mode_string(xfer_mask));
2318 2319 2320 2321 2322 2323 2324

	return 0;

 fail:
	return -EINVAL;
}

T
Tejun Heo 已提交
2325
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2326
{
2327
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2328 2329
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2330

2331
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2332 2333 2334
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2335
	err_mask = ata_dev_set_xfermode(dev);
2336
	if (err_mask) {
2337 2338
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2339 2340
		return -EIO;
	}
L
Linus Torvalds 已提交
2341

2342
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2343
	rc = ata_dev_revalidate(dev, 0);
2344
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2345
	if (rc)
2346
		return rc;
2347

2348 2349
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2350

2351 2352
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2353
	return 0;
L
Linus Torvalds 已提交
2354 2355 2356 2357 2358
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2359
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2360
 *
2361 2362 2363
 *	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
2364
 *
L
Linus Torvalds 已提交
2365
 *	LOCKING:
J
Jeff Garzik 已提交
2366
 *	PCI/etc. bus probe sem.
2367 2368 2369
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2370
 */
2371
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2372
{
2373
	struct ata_device *dev;
2374
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2375

2376
	/* has private set_mode? */
A
Alan 已提交
2377 2378
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2379

2380 2381
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2382
		unsigned int pio_mask, dma_mask;
2383

2384 2385
		dev = &ap->device[i];

2386
		if (!ata_dev_enabled(dev))
2387 2388
			continue;

T
Tejun Heo 已提交
2389
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2390

2391 2392 2393 2394
		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);
2395

2396
		found = 1;
2397 2398
		if (dev->dma_mode)
			used_dma = 1;
2399
	}
2400
	if (!found)
2401
		goto out;
2402 2403

	/* step 2: always set host PIO timings */
2404 2405 2406 2407 2408 2409
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2410
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2411
			rc = -EINVAL;
2412
			goto out;
2413 2414 2415 2416 2417 2418 2419
		}

		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
2420

2421
	/* step 3: set host DMA timings */
2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
	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
2433 2434

	/* step 4: update devices' xfer mode */
2435
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2436
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2437

A
Alan 已提交
2438
		/* don't update suspended devices' xfer mode */
2439
		if (!ata_dev_ready(dev))
2440 2441
			continue;

T
Tejun Heo 已提交
2442
		rc = ata_dev_set_mode(dev);
2443
		if (rc)
2444
			goto out;
2445
	}
L
Linus Torvalds 已提交
2446

2447 2448
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2449
	 */
J
Jeff Garzik 已提交
2450 2451
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
		ap->host->simplex_claimed = 1;
2452

2453
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2454 2455 2456
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

2457 2458 2459 2460
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2461 2462
}

2463 2464 2465 2466 2467 2468 2469 2470 2471 2472
/**
 *	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
2473
 *	spin_lock_irqsave(host lock)
2474 2475 2476 2477 2478 2479 2480 2481 2482
 */

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
2483 2484 2485 2486 2487 2488
/**
 *	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
2489 2490 2491
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2492 2493 2494 2495 2496
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2497
 */
2498 2499
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2500 2501 2502 2503 2504 2505 2506
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2507 2508
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2509 2510 2511 2512
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2513
	if (status != 0xff && (status & ATA_BUSY))
2514
		ata_port_printk(ap, KERN_WARNING,
2515 2516
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2517 2518

	timeout = timer_start + tmout;
2519 2520
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2521 2522 2523 2524
		msleep(50);
		status = ata_chk_status(ap);
	}

2525 2526 2527
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2528
	if (status & ATA_BUSY) {
2529
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2530 2531
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2532
		return -EBUSY;
L
Linus Torvalds 已提交
2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558
	}

	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
2559 2560
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

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

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

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

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2588 2589 2590 2591 2592
	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
2593 2594 2595 2596 2597 2598 2599 2600

	/* 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.
2601 2602
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2603 2604 2605
	 */
	msleep(150);

2606
	/* Before we perform post reset processing we want to see if
2607 2608 2609
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2610 2611
	if (ata_check_status(ap) == 0xFF)
		return 0;
2612

L
Linus Torvalds 已提交
2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630
	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
2631
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2632
 *	Obtains host lock.
L
Linus Torvalds 已提交
2633 2634
 *
 *	SIDE EFFECTS:
2635
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2636 2637 2638 2639 2640 2641 2642
 */

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
2643
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665

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

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

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

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

	/* issue bus reset */
	if (ap->flags & ATA_FLAG_SRST)
T
Tejun Heo 已提交
2666 2667
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2668 2669 2670 2671

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2672
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2673
	if ((slave_possible) && (err != 0x81))
2674
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2675 2676

	/* re-enable interrupts */
2677
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691

	/* 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
2692
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2693 2694 2695 2696 2697 2698
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2699
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2700 2701 2702 2703 2704
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723
/**
 *	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)
2724
{
2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779
	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;
2780 2781 2782 2783
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2784

2785
	scontrol = (scontrol & 0x0f0) | 0x300;
2786 2787 2788

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2789

2790 2791 2792 2793
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2794

2795
	return sata_phy_debounce(ap, params);
2796 2797
}

2798 2799 2800 2801 2802 2803 2804 2805
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) {
2806
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841

		/* 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;
2842
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2843 2844
	int rc;

2845 2846 2847 2848 2849 2850 2851 2852
	/* 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);
2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877

	/* 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;
}

2878 2879 2880 2881 2882
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2883
 *	Reset host port using ATA SRST.
2884 2885 2886 2887 2888 2889 2890
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2891
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2892 2893 2894 2895 2896 2897 2898
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

2899
	if (ata_port_offline(ap)) {
2900 2901 2902 2903
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916
	/* 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) {
2917 2918
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
2919 2920 2921 2922 2923 2924 2925 2926
		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);

2927
 out:
2928 2929 2930 2931 2932
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
2933
 *	sata_port_hardreset - reset port via SATA phy reset
2934
 *	@ap: port to reset
2935
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
2936 2937 2938 2939 2940 2941 2942 2943 2944
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2945
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
2946
{
2947
	u32 scontrol;
2948
	int rc;
2949

2950 2951
	DPRINTK("ENTER\n");

2952
	if (sata_set_spd_needed(ap)) {
2953 2954 2955 2956 2957
		/* 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.
		 */
2958
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2959
			goto out;
2960

2961
		scontrol = (scontrol & 0x0f0) | 0x304;
2962 2963

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2964
			goto out;
2965

2966
		sata_set_spd(ap);
2967 2968 2969
	}

	/* issue phy wake/reset */
2970
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2971
		goto out;
2972

2973
	scontrol = (scontrol & 0x0f0) | 0x301;
2974 2975

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
2976
		goto out;
2977

2978
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
2979 2980 2981 2982
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

2983
	/* bring phy back */
2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017
	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;
	}
3018 3019

	/* TODO: phy layer with polling, timeouts, etc. */
3020
	if (ata_port_offline(ap)) {
3021 3022 3023 3024 3025
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3026 3027 3028
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3029
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3030 3031
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3032 3033 3034
		return -EIO;
	}

3035 3036
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056
	*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)
{
3057 3058
	u32 serror;

3059 3060 3061
	DPRINTK("ENTER\n");

	/* print link status */
3062
	sata_print_link_status(ap);
3063

3064 3065 3066 3067
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3068
	/* re-enable interrupts */
3069 3070
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3071 3072 3073 3074 3075 3076 3077

	/* 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);

3078 3079 3080 3081 3082 3083 3084
	/* 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
3085 3086
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3087 3088 3089 3090

	DPRINTK("EXIT\n");
}

3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106
/**
 *	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
3107 3108
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3109 3110
{
	const u16 *old_id = dev->id;
3111 3112
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3113 3114 3115
	u64 new_n_sectors;

	if (dev->class != new_class) {
3116 3117
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3118 3119 3120
		return 0;
	}

3121 3122 3123 3124
	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]));
3125 3126 3127
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3128 3129
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3130 3131 3132 3133
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3134 3135
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3136 3137 3138 3139
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3140 3141 3142 3143
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3144 3145 3146 3147 3148 3149 3150 3151 3152
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3153
 *	@readid_flags: read ID flags
3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
 *
 *	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
 */
3164
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3165
{
3166
	unsigned int class = dev->class;
3167
	u16 *id = (void *)dev->ap->sector_buf;
3168 3169
	int rc;

3170 3171 3172 3173
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3174

3175
	/* read ID data */
3176
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3177 3178 3179 3180
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3181
	if (!ata_dev_same_device(dev, class, id)) {
3182 3183 3184 3185
		rc = -ENODEV;
		goto fail;
	}

3186
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3187 3188

	/* configure device according to the new ID */
3189
	rc = ata_dev_configure(dev);
3190 3191
	if (rc == 0)
		return 0;
3192 3193

 fail:
3194
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3195 3196 3197
	return rc;
}

3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

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

	/* Devices we expect to fail diagnostics */

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

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3247
};
3248

3249
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3250
{
T
Tejun Heo 已提交
3251 3252
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3253
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3254

T
Tejun Heo 已提交
3255 3256
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
3257

3258
	while (ad->model_num) {
T
Tejun Heo 已提交
3259
		if (!strcmp(ad->model_num, model_num)) {
3260 3261
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3262
			if (!strcmp(ad->model_rev, model_rev))
3263
				return ad->horkage;
3264
		}
3265
		ad++;
3266
	}
L
Linus Torvalds 已提交
3267 3268 3269
	return 0;
}

3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281
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;
}

3282 3283 3284 3285
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3286 3287 3288 3289
 *	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...
3290 3291 3292 3293
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3294
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3295
{
T
Tejun Heo 已提交
3296
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3297
	struct ata_host *host = ap->host;
3298
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3299

3300
	/* controller modes available */
3301 3302 3303 3304 3305 3306 3307 3308
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 */
	if (ap->cbl == ATA_CBL_PATA40)
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3309 3310 3311 3312 3313 3314 3315
	/* Apply drive side cable rule. Unknown or 80 pin cables reported
	 * host side are checked drive side as well. Cases where we know a
	 * 40wire cable is used safely for 80 are not checked here.
	 */
        if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);

L
Linus Torvalds 已提交
3316

3317 3318 3319
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3320

3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331
	/*
	 *	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));
	}

3332 3333
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3334 3335
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3336
	}
3337

J
Jeff Garzik 已提交
3338
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
3339 3340 3341
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3342
	}
3343

3344 3345 3346
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3347 3348
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3349 3350 3351 3352 3353 3354
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3355 3356 3357
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3358
 *	LOCKING:
J
Jeff Garzik 已提交
3359
 *	PCI/etc. bus probe sem.
3360 3361 3362
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3363 3364
 */

T
Tejun Heo 已提交
3365
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3366
{
3367
	struct ata_taskfile tf;
3368
	unsigned int err_mask;
L
Linus Torvalds 已提交
3369 3370 3371 3372

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

T
Tejun Heo 已提交
3373
	ata_tf_init(dev, &tf);
3374 3375 3376 3377 3378
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3379

T
Tejun Heo 已提交
3380
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3381

3382 3383
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3384 3385
}

3386 3387 3388
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3389 3390
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3391 3392
 *
 *	LOCKING:
3393 3394 3395 3396
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3397
 */
T
Tejun Heo 已提交
3398 3399
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3400
{
3401
	struct ata_taskfile tf;
3402
	unsigned int err_mask;
3403 3404 3405

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3406
		return AC_ERR_INVALID;
3407 3408 3409 3410

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

T
Tejun Heo 已提交
3411
	ata_tf_init(dev, &tf);
3412 3413 3414 3415 3416
	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 */
3417

T
Tejun Heo 已提交
3418
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3419

3420 3421
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3422 3423
}

L
Linus Torvalds 已提交
3424
/**
J
Jeff Garzik 已提交
3425 3426 3427 3428
 *	ata_sg_clean - Unmap DMA memory associated with command
 *	@qc: Command containing DMA memory to be released
 *
 *	Unmap all mapped DMA memory associated with this command.
L
Linus Torvalds 已提交
3429 3430
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3431
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3432
 */
3433
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3434 3435
{
	struct ata_port *ap = qc->ap;
3436
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3437
	int dir = qc->dma_dir;
3438
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3439

3440 3441
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3442 3443

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3444
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3445

J
Jeff Garzik 已提交
3446
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3447

3448 3449 3450 3451 3452 3453 3454 3455
	/* 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) {
3456
		if (qc->n_elem)
3457
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3458 3459 3460 3461 3462 3463
		/* 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);
3464
			kunmap_atomic(addr, KM_IRQ0);
3465 3466
		}
	} else {
3467
		if (qc->n_elem)
3468
			dma_unmap_single(ap->dev,
3469 3470
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3471 3472 3473 3474 3475 3476
		/* 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
3477 3478

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3479
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3480 3481 3482 3483 3484 3485
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3486 3487 3488
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3489
 *	LOCKING:
J
Jeff Garzik 已提交
3490
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3491 3492 3493 3494 3495
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3496 3497
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3498

3499
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3500
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3501 3502

	idx = 0;
3503
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536
		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
3537 3538 3539 3540
 *	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
3541
 *	LOCKING:
J
Jeff Garzik 已提交
3542
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3543
 *
L
Linus Torvalds 已提交
3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int rc = 0; /* Assume ATAPI DMA is OK by default */

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

	return rc;
}
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
3561 3562
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3563
 *	LOCKING:
J
Jeff Garzik 已提交
3564
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3565 3566 3567 3568 3569 3570 3571 3572 3573
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3574 3575
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3576 3577 3578 3579 3580 3581 3582 3583 3584 3585
/**
 *	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
3586
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3587 3588
 */

L
Linus Torvalds 已提交
3589 3590 3591 3592
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3593
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3594
	qc->n_elem = 1;
3595
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3596
	qc->buf_virt = buf;
3597
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3598

3599
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3600 3601
}

J
Jeff Garzik 已提交
3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612
/**
 *	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
3613
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3614 3615
 */

L
Linus Torvalds 已提交
3616 3617 3618 3619
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3620
	qc->__sg = sg;
L
Linus Torvalds 已提交
3621
	qc->n_elem = n_elem;
3622
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3623 3624 3625
}

/**
J
Jeff Garzik 已提交
3626 3627 3628 3629
 *	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
3630 3631
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3632
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3633 3634
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3635
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3636 3637 3638 3639 3640 3641
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3642
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3643
	dma_addr_t dma_address;
3644
	int trim_sg = 0;
L
Linus Torvalds 已提交
3645

3646 3647 3648 3649 3650 3651
	/* 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;

3652
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663

		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;
3664 3665
		if (sg->length == 0)
			trim_sg = 1;
3666 3667 3668 3669 3670

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

3671 3672
	if (trim_sg) {
		qc->n_elem--;
3673 3674 3675
		goto skip_map;
	}

3676
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3677
				     sg->length, dir);
3678 3679 3680
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3681
		return -1;
3682
	}
L
Linus Torvalds 已提交
3683 3684

	sg_dma_address(sg) = dma_address;
3685
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3686

3687
skip_map:
L
Linus Torvalds 已提交
3688 3689 3690 3691 3692 3693 3694
	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
3695 3696 3697 3698
 *	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
3699 3700
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3701
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3702 3703
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3704
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3705 3706 3707 3708 3709 3710
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3711 3712
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3713
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3714 3715

	VPRINTK("ENTER, ata%u\n", ap->id);
3716
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3717

3718 3719 3720 3721 3722 3723 3724
	/* 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;

3725
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739

		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);
3740
			kunmap_atomic(addr, KM_IRQ0);
3741 3742 3743 3744 3745 3746
		}

		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;
3747 3748
		if (lsg->length == 0)
			trim_sg = 1;
3749 3750 3751 3752 3753

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

3754 3755 3756 3757 3758 3759 3760 3761 3762
	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
3763
	dir = qc->dma_dir;
3764
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3765 3766 3767
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3768
		return -1;
3769
	}
L
Linus Torvalds 已提交
3770 3771 3772

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

3773
skip_map:
L
Linus Torvalds 已提交
3774 3775 3776 3777 3778
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3779
/**
3780
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3781 3782 3783 3784 3785 3786 3787 3788
 *	@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
3789
 *	Inherited from caller.
E
Edward Falk 已提交
3790
 */
L
Linus Torvalds 已提交
3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
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
3801
/**
T
Tejun Heo 已提交
3802
 *	ata_data_xfer - Transfer data by PIO
3803
 *	@adev: device to target
A
Albert Lee 已提交
3804 3805
 *	@buf: data buffer
 *	@buflen: buffer length
3806
 *	@write_data: read/write
A
Albert Lee 已提交
3807 3808 3809 3810 3811 3812
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3813 3814
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3815
{
3816
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3817
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3818

A
Albert Lee 已提交
3819
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3820
	if (write_data)
T
Tejun Heo 已提交
3821
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3822
	else
T
Tejun Heo 已提交
3823
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
3824 3825 3826 3827 3828 3829 3830 3831

	/* 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
3832
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
3833
		} else {
T
Tejun Heo 已提交
3834
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
3835 3836 3837
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3838 3839
}

3840
/**
T
Tejun Heo 已提交
3841
 *	ata_data_xfer_noirq - Transfer data by PIO
3842 3843 3844 3845 3846
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3847
 *	Transfer data from/to the device data register by PIO. Do the
3848 3849 3850 3851 3852
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3853 3854
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
3855 3856 3857
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
3858
	ata_data_xfer(adev, buf, buflen, write_data);
3859 3860 3861 3862
	local_irq_restore(flags);
}


A
Albert Lee 已提交
3863 3864 3865 3866 3867 3868 3869 3870 3871 3872
/**
 *	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
3873 3874 3875
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3876
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3877 3878 3879 3880 3881
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
3882
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
3883
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3884 3885

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
3886
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
3887 3888 3889 3890 3891 3892 3893

	/* 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");

3894 3895 3896
	if (PageHighMem(page)) {
		unsigned long flags;

3897
		/* FIXME: use a bounce buffer */
3898 3899
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
3900

3901
		/* do the actual data transfer */
3902
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
3903

3904 3905 3906 3907
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
3908
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
3909
	}
L
Linus Torvalds 已提交
3910

T
Tejun Heo 已提交
3911 3912
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
3913

T
Tejun Heo 已提交
3914
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
3915 3916 3917 3918 3919
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

3920 3921 3922 3923
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
3924
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
3925 3926 3927 3928 3929
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
3930

3931 3932 3933 3934 3935 3936
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
3937
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
3938

T
Tejun Heo 已提交
3939 3940
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
3941 3942 3943 3944 3945 3946
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962
/**
 *	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");
3963
	WARN_ON(qc->dev->cdb_len < 12);
3964

3965
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980
	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
3981 3982
}

A
Albert Lee 已提交
3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994
/**
 *	__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
3995 3996 3997
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3998
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3999 4000 4001 4002 4003
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4004
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4005
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4006 4007

next_sg:
4008
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4009
		/*
4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020
		 * 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 */
4021 4022
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4023 4024

		for (i = 0; i < words; i++)
4025
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4026

A
Albert Lee 已提交
4027
		ap->hsm_task_state = HSM_ST_LAST;
4028 4029 4030
		return;
	}

4031
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4032 4033 4034 4035 4036 4037 4038 4039

	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;

4040
	/* don't overrun current sg */
4041
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4042 4043 4044 4045

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

4046 4047
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4048 4049 4050
	if (PageHighMem(page)) {
		unsigned long flags;

4051
		/* FIXME: use bounce buffer */
4052 4053
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4054

4055
		/* do the actual data transfer */
4056
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4057

4058 4059 4060 4061
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4062
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4063
	}
L
Linus Torvalds 已提交
4064 4065 4066 4067 4068

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

4069
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4070 4071 4072 4073
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4074
	if (bytes)
L
Linus Torvalds 已提交
4075 4076 4077
		goto next_sg;
}

A
Albert Lee 已提交
4078 4079 4080 4081 4082 4083 4084 4085 4086 4087
/**
 *	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
4088 4089 4090 4091 4092 4093 4094
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;

4095 4096 4097 4098 4099 4100 4101 4102 4103 4104
	/* 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
4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115
	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;

4116 4117
	VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);

L
Linus Torvalds 已提交
4118 4119 4120 4121 4122
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4123
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4124
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4125
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4126 4127 4128
}

/**
4129 4130 4131
 *	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
4132
 *
4133 4134
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4135
 */
4136 4137

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4138
{
4139 4140
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4141

4142 4143 4144 4145
	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
4146

4147 4148 4149
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4150 4151
	}

4152 4153
	return 0;
}
L
Linus Torvalds 已提交
4154

T
Tejun Heo 已提交
4155 4156 4157 4158 4159 4160 4161 4162
/**
 *	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
4163
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4164 4165 4166 4167 4168 4169 4170 4171 4172
 *	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) {
4173
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4174

J
Jeff Garzik 已提交
4175 4176
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4177 4178 4179 4180
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4181
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4182 4183 4184 4185 4186
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4187
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4188 4189 4190 4191 4192 4193 4194 4195
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4196
			spin_lock_irqsave(ap->lock, flags);
4197
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4198
			ata_qc_complete(qc);
4199
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4200 4201 4202
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4203

4204
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4205 4206
}

4207 4208 4209 4210 4211 4212 4213 4214 4215 4216
/**
 *	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.
 */
4217 4218
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4219
{
4220 4221 4222
	unsigned long flags = 0;
	int poll_next;

4223 4224
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4225 4226 4227 4228
	/* 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).
	 */
4229
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4230

4231
fsm_start:
4232 4233 4234
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state, status);

4235 4236
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4237 4238 4239 4240 4241 4242 4243 4244
		/* 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);

4245
		/* check device status */
4246 4247 4248 4249 4250 4251 4252 4253 4254
		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
4255
			ap->hsm_task_state = HSM_ST_ERR;
4256
			goto fsm_start;
L
Linus Torvalds 已提交
4257 4258
		}

4259 4260
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4261 4262 4263
		 * 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.
4264 4265 4266 4267
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
			       ap->id, status);
4268
			qc->err_mask |= AC_ERR_HSM;
4269 4270
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4271
		}
L
Linus Torvalds 已提交
4272

4273 4274 4275 4276 4277 4278
		/* 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)
4279
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4280

4281 4282 4283 4284
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4285

4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297
			/* 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)
4298
			spin_unlock_irqrestore(ap->lock, flags);
4299 4300 4301 4302

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4303
		break;
4304

4305 4306 4307 4308 4309
	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) {
4310 4311 4312
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4313 4314 4315
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4316

4317 4318
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4319 4320 4321
			 * 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.
4322 4323 4324 4325
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
				       ap->id, status);
4326
				qc->err_mask |= AC_ERR_HSM;
4327 4328
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4329
			}
L
Linus Torvalds 已提交
4330

4331
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4332

4333 4334 4335
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4336

4337 4338 4339 4340
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4341 4342 4343 4344
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4345 4346 4347 4348 4349 4350
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4351

4352 4353 4354
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4355

4356 4357 4358 4359 4360 4361 4362 4363 4364
			/* 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.
4365 4366 4367 4368
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4369 4370 4371 4372 4373 4374 4375

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

4376 4377 4378
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4379 4380 4381 4382 4383 4384
				/* 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;
4385 4386
			}

4387 4388 4389 4390 4391 4392
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4393
				status = ata_wait_idle(ap);
4394 4395 4396 4397 4398
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4399
		poll_next = 1;
L
Linus Torvalds 已提交
4400 4401
		break;

A
Albert Lee 已提交
4402
	case HSM_ST_LAST:
4403 4404
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4405 4406 4407 4408 4409
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4410 4411
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
			ap->id, qc->dev->devno, status);
4412

4413 4414
		WARN_ON(qc->err_mask);

4415
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4416

4417
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4418
		ata_hsm_qc_complete(qc, in_wq);
4419 4420

		poll_next = 0;
L
Linus Torvalds 已提交
4421 4422
		break;

A
Albert Lee 已提交
4423
	case HSM_ST_ERR:
4424 4425 4426 4427 4428 4429
		/* 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;
4430

4431
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4432
		ata_hsm_qc_complete(qc, in_wq);
4433 4434

		poll_next = 0;
4435 4436
		break;
	default:
4437
		poll_next = 0;
4438
		BUG();
L
Linus Torvalds 已提交
4439 4440
	}

4441
	return poll_next;
L
Linus Torvalds 已提交
4442 4443
}

4444
static void ata_pio_task(struct work_struct *work)
4445
{
4446 4447 4448
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4449
	u8 status;
4450
	int poll_next;
4451

J
Jeff Garzik 已提交
4452
fsm_start:
4453
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4454

4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466
	/*
	 * 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) {
4467
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4468 4469
			return;
		}
4470 4471
	}

4472 4473
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4474

4475 4476 4477 4478
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4479
		goto fsm_start;
4480 4481
}

L
Linus Torvalds 已提交
4482 4483 4484 4485 4486 4487
/**
 *	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
4488
 *	None.
L
Linus Torvalds 已提交
4489 4490 4491 4492 4493 4494 4495
 */

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

4496
	/* no command while frozen */
4497
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4498 4499
		return NULL;

4500 4501
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4502
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4503
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517
			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
4518
 *	None.
L
Linus Torvalds 已提交
4519 4520
 */

T
Tejun Heo 已提交
4521
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4522
{
T
Tejun Heo 已提交
4523
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4524 4525 4526 4527 4528 4529 4530 4531
	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
4532
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545
	}

	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
4546
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4547 4548 4549
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4550 4551 4552
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4553
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4554

4555 4556 4557 4558
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4559
		clear_bit(tag, &ap->qc_allocated);
4560
	}
L
Linus Torvalds 已提交
4561 4562
}

4563
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4564
{
4565 4566
	struct ata_port *ap = qc->ap;

4567 4568
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4569 4570 4571 4572

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

4573
	/* command should be marked inactive atomically with qc completion */
4574 4575 4576 4577
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4578

4579 4580 4581 4582 4583
	/* 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;
4584
	ap->qc_active &= ~(1 << qc->tag);
4585

L
Linus Torvalds 已提交
4586
	/* call completion callback */
4587
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4588 4589
}

4590 4591 4592 4593 4594 4595 4596 4597
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

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

4598 4599 4600 4601 4602 4603 4604 4605 4606
/**
 *	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
4607
 *	spin_lock_irqsave(host lock)
4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626
 */
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) {
4627
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4628 4629 4630 4631 4632 4633 4634

		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 */
4635
				fill_result_tf(qc);
4636 4637 4638 4639 4640 4641 4642
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4643
			fill_result_tf(qc);
4644 4645 4646 4647 4648 4649 4650 4651

		__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)
4652
			fill_result_tf(qc);
4653 4654 4655 4656 4657

		__ata_qc_complete(qc);
	}
}

4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669
/**
 *	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
4670
 *	spin_lock_irqsave(host lock)
4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706
 *
 *	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
4707 4708 4709 4710 4711
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4712
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740
	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
4741
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4742
 */
4743
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4744 4745 4746
{
	struct ata_port *ap = qc->ap;

4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760
	/* 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;
	}

4761
	qc->flags |= ATA_QCFLAG_ACTIVE;
4762
	ap->qc_active |= 1 << qc->tag;
4763

L
Linus Torvalds 已提交
4764 4765 4766
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4767
				goto sg_err;
L
Linus Torvalds 已提交
4768 4769
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4770
				goto sg_err;
L
Linus Torvalds 已提交
4771 4772 4773 4774 4775 4776 4777
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4778 4779 4780 4781
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4782

4783 4784
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4785 4786 4787
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798
}

/**
 *	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
4799 4800
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4801
 *	LOCKING:
J
Jeff Garzik 已提交
4802
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4803 4804
 *
 *	RETURNS:
4805
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4806 4807
 */

4808
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4809 4810 4811
{
	struct ata_port *ap = qc->ap;

4812 4813 4814 4815 4816 4817
	/* 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:
4818
		case ATA_PROT_NODATA:
4819 4820 4821 4822 4823 4824
		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)
4825
				/* see ata_dma_blacklisted() */
4826 4827 4828 4829 4830 4831 4832
				BUG();
			break;
		default:
			break;
		}
	}

4833 4834 4835 4836 4837 4838 4839 4840
	/* 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;

4841
	/* select the device */
L
Linus Torvalds 已提交
4842 4843
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4844
	/* start the command */
L
Linus Torvalds 已提交
4845 4846
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4847 4848 4849
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4850
		ata_tf_to_host(ap, &qc->tf);
4851 4852 4853
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
4854
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4855

L
Linus Torvalds 已提交
4856 4857 4858
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
4859
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4860

L
Linus Torvalds 已提交
4861 4862 4863
		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 */
4864
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4865 4866
		break;

4867 4868 4869
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
4870

J
Jeff Garzik 已提交
4871
		ata_tf_to_host(ap, &qc->tf);
4872

4873 4874 4875
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
4876
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4877 4878

			/* always send first data block using
4879
			 * the ata_pio_task() codepath.
4880
			 */
4881
		} else {
4882 4883 4884 4885
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
4886
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
4887 4888 4889 4890

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
4891 4892
		}

L
Linus Torvalds 已提交
4893 4894 4895 4896
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
4897 4898 4899
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4900
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
4901

4902 4903 4904 4905 4906
		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))
4907
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
4908 4909 4910
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
4911
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4912

L
Linus Torvalds 已提交
4913 4914
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
4915 4916 4917 4918
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4919
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
4920 4921 4922 4923
		break;

	default:
		WARN_ON(1);
4924
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939
	}

	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
4940
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4941 4942 4943 4944 4945 4946 4947 4948
 *
 *	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)
{
4949
	struct ata_eh_info *ehi = &ap->eh_info;
4950
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
4951

4952 4953
	VPRINTK("ata%u: protocol %d task_state %d\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
4954

4955 4956 4957
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4958 4959 4960
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
4961

4962 4963 4964 4965 4966
		/* 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
4967 4968
			goto idle_irq;
		break;
4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
			VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);

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

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
4982 4983 4984 4985 4986 4987

			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;
			}
4988 4989 4990 4991
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
4992 4993 4994 4995
	default:
		goto idle_irq;
	}

4996 4997 4998 4999
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5000

5001 5002 5003 5004
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5005

5006 5007
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5008

5009
	ata_hsm_move(ap, qc, status, 0);
5010 5011 5012 5013 5014

	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
5015 5016 5017 5018 5019 5020 5021
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5022
		ap->ops->irq_ack(ap, 0); /* debug trap */
5023
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5024
		return 1;
L
Linus Torvalds 已提交
5025 5026 5027 5028 5029 5030 5031
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5032
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5033
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5034
 *
J
Jeff Garzik 已提交
5035 5036 5037
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5038
 *	LOCKING:
J
Jeff Garzik 已提交
5039
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5040 5041
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5042
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5043 5044
 */

5045
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5046
{
J
Jeff Garzik 已提交
5047
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5048 5049 5050 5051 5052
	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
5053
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5054

J
Jeff Garzik 已提交
5055
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5056 5057
		struct ata_port *ap;

J
Jeff Garzik 已提交
5058
		ap = host->ports[i];
5059
		if (ap &&
J
Jeff Garzik 已提交
5060
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5061 5062 5063
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5064
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5065
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5066 5067 5068 5069
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5070
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5071 5072 5073 5074

	return IRQ_RETVAL(handled);
}

5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211
/**
 *	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
5212

5213
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5214
{
5215
	unsigned int err_mask;
J
Jens Axboe 已提交
5216 5217 5218 5219 5220
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5221
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5222 5223 5224 5225
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5226 5227 5228 5229 5230 5231 5232
	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
5233 5234
}

J
Jeff Garzik 已提交
5235 5236 5237
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5238 5239 5240 5241
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5242 5243
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282

		/* 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
5283 5284
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5285 5286
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5287
 *	Suspend @host.  Actual operation is performed by EH.  This
5288 5289 5290 5291 5292 5293 5294 5295 5296
 *	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
5297
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5298 5299 5300
{
	int i, j, rc;

J
Jeff Garzik 已提交
5301
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5302 5303 5304 5305 5306 5307 5308
	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
5309 5310
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324

		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
5325
	host->dev->power.power_state = mesg;
5326 5327 5328
	return 0;

 fail:
J
Jeff Garzik 已提交
5329
	ata_host_resume(host);
5330 5331 5332 5333
	return rc;
}

/**
J
Jeff Garzik 已提交
5334 5335
 *	ata_host_resume - resume host
 *	@host: host to resume
5336
 *
J
Jeff Garzik 已提交
5337
 *	Resume @host.  Actual operation is performed by EH.  This
5338 5339 5340 5341 5342 5343
 *	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
5344
void ata_host_resume(struct ata_host *host)
5345
{
J
Jeff Garzik 已提交
5346 5347 5348
	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;
5349 5350
}

5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362
/**
 *	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.
 */
5363
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5364
{
5365
	struct device *dev = ap->dev;
5366
	int rc;
L
Linus Torvalds 已提交
5367

5368 5369
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5370 5371 5372
	if (!ap->prd)
		return -ENOMEM;

5373
	rc = ata_pad_alloc(ap, dev);
5374
	if (rc)
5375
		return rc;
L
Linus Torvalds 已提交
5376

5377 5378
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5379 5380 5381
	return 0;
}

5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393
/**
 *	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;
5394 5395
	unsigned long flags;

5396 5397 5398
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5399 5400
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5401
	 * host lock.
5402
	 */
5403
	spin_lock_irqsave(ap->lock, flags);
5404
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5405
	spin_unlock_irqrestore(ap->lock, flags);
5406

5407 5408
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5409 5410 5411 5412 5413
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5414
/**
B
Brian King 已提交
5415
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5416
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5417
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5418 5419 5420
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5421
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5422
 *
L
Linus Torvalds 已提交
5423
 *	LOCKING:
J
Jeff Garzik 已提交
5424
 *	Inherited from caller.
L
Linus Torvalds 已提交
5425
 */
J
Jeff Garzik 已提交
5426
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5427
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5428 5429 5430
{
	unsigned int i;

J
Jeff Garzik 已提交
5431
	ap->lock = &host->lock;
5432
	ap->flags = ATA_FLAG_DISABLED;
B
Brian King 已提交
5433
	ap->id = ata_unique_id++;
L
Linus Torvalds 已提交
5434
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5435
	ap->host = host;
5436
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5437
	ap->port_no = port_no;
5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450
	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;
	}
5451
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5452 5453
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5454 5455 5456 5457 5458 5459

#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
5460
#else
5461
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5462
#endif
L
Linus Torvalds 已提交
5463

5464 5465 5466
	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);
5467
	INIT_LIST_HEAD(&ap->eh_done_q);
5468
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5469

5470 5471 5472 5473 5474
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5475 5476
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5477
		dev->ap = ap;
5478
		dev->devno = i;
5479
		ata_dev_init(dev);
5480
	}
L
Linus Torvalds 已提交
5481 5482 5483 5484 5485 5486 5487 5488 5489

#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
5490
/**
5491 5492 5493
 *	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
5494
 *
5495
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5496 5497 5498 5499
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5500
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5501
{
J
Jeff Garzik 已提交
5502
	ap->scsi_host = shost;
B
Brian King 已提交
5503

5504 5505 5506 5507 5508
	shost->unique_id = ap->id;
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5509 5510
}

L
Linus Torvalds 已提交
5511
/**
5512
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5513
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5514
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5515 5516
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5517 5518
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5519
 *	LOCKING:
J
Jeff Garzik 已提交
5520
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5521 5522
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5523
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5524
 */
5525
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5526
				      struct ata_host *host,
L
Linus Torvalds 已提交
5527 5528
				      unsigned int port_no)
{
5529
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5530 5531 5532
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5533

5534
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5535
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5536 5537 5538 5539 5540
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5541 5542
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5543 5544
		return NULL;

5545
	shost->transportt = &ata_scsi_transport_template;
5546

5547
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5548

J
Jeff Garzik 已提交
5549
	ata_port_init(ap, host, ent, port_no);
5550
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5551 5552 5553 5554

	return ap;
}

5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

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

		if (!ap)
			continue;

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

		scsi_host_put(ap->scsi_host);
	}

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

5576
/**
J
Jeff Garzik 已提交
5577 5578 5579 5580 5581
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5582 5583 5584 5585 5586 5587
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5588 5589
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5590
{
J
Jeff Garzik 已提交
5591 5592 5593 5594
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5595 5596
}

L
Linus Torvalds 已提交
5597
/**
J
Jeff Garzik 已提交
5598 5599 5600 5601 5602 5603 5604 5605 5606 5607
 *	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
5608 5609
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5610
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5611 5612
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5613
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5614
 */
J
Jeff Garzik 已提交
5615
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5616
{
5617
	unsigned int i;
L
Linus Torvalds 已提交
5618
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5619
	struct ata_host *host;
5620
	int rc;
L
Linus Torvalds 已提交
5621 5622

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5623

5624 5625 5626 5627
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5628 5629 5630 5631

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

L
Linus Torvalds 已提交
5632
	/* alloc a container for our list of ATA ports (buses) */
5633 5634
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5635
	if (!host)
5636 5637 5638
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5639

J
Jeff Garzik 已提交
5640 5641 5642 5643
	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
5644
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5645
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5646 5647

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5648
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5649 5650
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5651
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5652

J
Jeff Garzik 已提交
5653
		ap = ata_port_add(ent, host, i);
5654
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5655 5656 5657
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5658 5659 5660 5661 5662 5663 5664 5665 5666 5667
		/* 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
5668 5669
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5670 5671 5672
			goto err_out;
		}

5673 5674 5675 5676
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5677 5678 5679 5680 5681
		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
5682 5683
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5684 5685 5686 5687 5688
				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,
5689
				irq_line);
L
Linus Torvalds 已提交
5690

5691 5692
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5693 5694
	}

5695
	/* obtain irq, that may be shared between channels */
5696 5697
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5698 5699 5700
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5701
		goto err_out;
5702
	}
L
Linus Torvalds 已提交
5703

5704 5705 5706 5707 5708 5709
	/* 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);

5710 5711 5712
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5713 5714 5715
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5716
			goto err_out;
5717 5718 5719
		}
	}

5720
	/* resource acquisition complete */
T
Tejun Heo 已提交
5721
	devres_remove_group(dev, ata_device_add);
5722

L
Linus Torvalds 已提交
5723 5724
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5725 5726
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5727
		u32 scontrol;
L
Linus Torvalds 已提交
5728 5729
		int rc;

5730 5731 5732 5733 5734 5735 5736
		/* 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
5737
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5738
		if (rc) {
5739
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5740 5741 5742 5743 5744 5745
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5746

5747
		if (ap->ops->error_handler) {
5748
			struct ata_eh_info *ehi = &ap->eh_info;
5749 5750 5751 5752 5753
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5754
			spin_lock_irqsave(ap->lock, flags);
5755

5756 5757 5758
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5759

5760
			ap->pflags |= ATA_PFLAG_LOADING;
5761 5762
			ata_port_schedule_eh(ap);

5763
			spin_unlock_irqrestore(ap->lock, flags);
5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780

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

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
L
Linus Torvalds 已提交
5781 5782 5783
	}

	/* probes are done, now scan each port's disk(s) */
5784
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5785 5786
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5787

J
Jeff Garzik 已提交
5788
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5789 5790 5791 5792 5793
	}

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

5794 5795 5796 5797
 err_out:
	devres_release_group(dev, ata_device_add);
	dev_set_drvdata(dev, NULL);
	VPRINTK("EXIT, returning %d\n", rc);
L
Linus Torvalds 已提交
5798 5799 5800
	return 0;
}

5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817
/**
 *	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)
5818
		goto skip_eh;
5819 5820

	/* tell EH we're leaving & flush EH */
5821
	spin_lock_irqsave(ap->lock, flags);
5822
	ap->pflags |= ATA_PFLAG_UNLOADING;
5823
	spin_unlock_irqrestore(ap->lock, flags);
5824 5825 5826 5827 5828 5829

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5830
	spin_lock_irqsave(ap->lock, flags);
5831 5832 5833 5834

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

5835
	spin_unlock_irqrestore(ap->lock, flags);
5836 5837 5838 5839 5840

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5841
	spin_lock_irqsave(ap->lock, flags);
5842
	ata_port_freeze(ap);	/* won't be thawed */
5843
	spin_unlock_irqrestore(ap->lock, flags);
5844 5845 5846 5847 5848 5849 5850 5851 5852 5853

	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);

5854
 skip_eh:
5855
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5856
	scsi_remove_host(ap->scsi_host);
5857 5858
}

T
Tejun Heo 已提交
5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875
/**
 *	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]);
}

5876 5877 5878 5879 5880
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

5881 5882 5883 5884 5885
	/* XXX - the following if can go away once all LLDs are managed */
	if (!list_empty(&dev->devres_head))
		probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
	else
		probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
5886 5887 5888 5889 5890 5891 5892 5893 5894 5895
	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
5896
	probe_ent->port_flags = port->flags;
5897 5898 5899 5900
	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;
5901
	probe_ent->private_data = port->private_data;
5902 5903 5904 5905

	return probe_ent;
}

L
Linus Torvalds 已提交
5906 5907 5908
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
5909 5910 5911 5912 5913 5914 5915
 *
 *	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
5916
 */
E
Edward Falk 已提交
5917

L
Linus Torvalds 已提交
5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931
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
5932

5933 5934
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
5935 5936 5937 5938
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
5939 5940 5941
 *	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
5942 5943 5944 5945
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
5946
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
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{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
5949
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
5950

T
Tejun Heo 已提交
5951
	ata_host_detach(host);
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Linus Torvalds 已提交
5952 5953 5954
}

/* move to PCI subsystem */
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Jeff Garzik 已提交
5955
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
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{
	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;
}
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5988
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
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{
	pci_save_state(pdev);
5991

5992
	if (mesg.event == PM_EVENT_SUSPEND) {
5993 5994 5995
		pci_disable_device(pdev);
		pci_set_power_state(pdev, PCI_D3hot);
	}
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}

5998
int ata_pci_device_do_resume(struct pci_dev *pdev)
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{
6000 6001
	int rc;

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	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6004

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	rc = pcim_enable_device(pdev);
6006 6007 6008 6009 6010 6011
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

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Jens Axboe 已提交
6012
	pci_set_master(pdev);
6013
	return 0;
6014 6015
}

6016
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6017
{
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Jeff Garzik 已提交
6018
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6019 6020
	int rc = 0;

J
Jeff Garzik 已提交
6021
	rc = ata_host_suspend(host, mesg);
6022 6023 6024
	if (rc)
		return rc;

6025
	ata_pci_device_do_suspend(pdev, mesg);
6026 6027 6028 6029 6030 6031

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6032
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6033
	int rc;
6034

6035 6036 6037 6038
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
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Jens Axboe 已提交
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}
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6040 6041 6042 6043 6044
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
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6045
	ata_probe_timeout *= HZ;
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	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6050 6051 6052 6053 6054 6055
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

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	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6063
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6064 6065
}

6066
subsys_initcall(ata_init);
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6067 6068
module_exit(ata_exit);

6069
static unsigned long ratelimit_time;
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Ingo Molnar 已提交
6070
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089

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;
}

6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135
/**
 *	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;
}

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Tejun Heo 已提交
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/*
 * Dummy port_ops
 */
static void ata_dummy_noret(struct ata_port *ap)	{ }
static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }

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

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

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

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/*
 * 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.
 */

6176 6177 6178
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
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Tejun Heo 已提交
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EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
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6180 6181
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
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Jeff Garzik 已提交
6182
EXPORT_SYMBOL_GPL(ata_host_init);
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6183
EXPORT_SYMBOL_GPL(ata_device_add);
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Tejun Heo 已提交
6184
EXPORT_SYMBOL_GPL(ata_host_detach);
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6185 6186
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6187
EXPORT_SYMBOL_GPL(ata_hsm_move);
6188
EXPORT_SYMBOL_GPL(ata_qc_complete);
6189
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
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EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
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);
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EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
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EXPORT_SYMBOL_GPL(ata_qc_prep);
6205
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
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EXPORT_SYMBOL_GPL(ata_bmdma_setup);
EXPORT_SYMBOL_GPL(ata_bmdma_start);
EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
EXPORT_SYMBOL_GPL(ata_bmdma_status);
EXPORT_SYMBOL_GPL(ata_bmdma_stop);
6211 6212 6213 6214 6215
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
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EXPORT_SYMBOL_GPL(ata_port_probe);
6217
EXPORT_SYMBOL_GPL(sata_set_spd);
6218 6219
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6220 6221 6222
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6223
EXPORT_SYMBOL_GPL(ata_std_prereset);
6224
EXPORT_SYMBOL_GPL(ata_std_softreset);
6225
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6226 6227
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6228 6229
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6230
EXPORT_SYMBOL_GPL(ata_port_disable);
6231
EXPORT_SYMBOL_GPL(ata_ratelimit);
6232
EXPORT_SYMBOL_GPL(ata_wait_register);
6233
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6234
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6235 6236 6237
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6238
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6239
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6240
EXPORT_SYMBOL_GPL(ata_host_intr);
6241 6242 6243 6244 6245 6246
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
EXPORT_SYMBOL_GPL(ata_port_online);
EXPORT_SYMBOL_GPL(ata_port_offline);
J
Jeff Garzik 已提交
6247 6248
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6249 6250
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6251
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6252 6253
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6254
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6255 6256 6257
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6258 6259 6260 6261 6262
#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);
6263 6264
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6265 6266
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
Alan Cox 已提交
6267 6268
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6269
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6270 6271 6272

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6273 6274

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6275 6276
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6277 6278 6279
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6280 6281
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6282
EXPORT_SYMBOL_GPL(ata_do_eh);
6283 6284 6285 6286
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);