libata-core.c 169.0 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	"2.21"	/* 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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unsigned int ata_print_id = 1;
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static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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

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

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

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static int ata_ignore_hpa = 0;
module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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void ata_dev_disable(struct ata_device *dev)
602
{
603
	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
604
		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
605 606
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
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		dev->class++;
	}
}

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
697
 *	@r_err: Value of error register on completion
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
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 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

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unsigned int
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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);
727
	err = tf.feature;
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	if (r_err)
		*r_err = err;
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	/* see if device passed diags: if master then continue and warn later */
	if (err == 0 && device == 0)
		/* diagnostic fail : do nothing _YET_ */
		ap->device[device].horkage |= ATA_HORKAGE_DIAGNOSTIC;
	else if (err == 1)
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		/* do nothing */ ;
	else if ((device == 0) && (err == 0x81))
		/* do nothing */ ;
	else
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		return ATA_DEV_NONE;
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	/* determine if device is ATA or ATAPI */
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	class = ata_dev_classify(&tf);
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	if (class == ATA_DEV_UNKNOWN)
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		return ATA_DEV_NONE;
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	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
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		return ATA_DEV_NONE;
	return class;
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}

/**
753
 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an even number.
 *
 *	The strings in the IDENTIFY DEVICE page are broken up into
 *	16-bit chunks.  Run through the string, and output each
 *	8-bit chunk linearly, regardless of platform.
 *
 *	LOCKING:
 *	caller.
 */

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

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

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

		ofs++;
		len -= 2;
	}
}

786
/**
787
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
788 789 790 791 792
 *	@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.
 *
793
 *	This function is identical to ata_id_string except that it
794 795 796 797 798 799
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
800 801
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
802 803 804 805 806
{
	unsigned char *p;

	WARN_ON(!(len & 1));

807
	ata_id_string(id, s, ofs, len - 1);
808 809 810 811 812 813

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
	sectors |= (tf->hob_lbal & 0xff) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

	return ++sectors;
}

static u64 ata_tf_to_lba(struct ata_taskfile *tf)
{
	u64 sectors = 0;

	sectors |= (tf->device & 0x0f) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

	return ++sectors;
}

/**
 *	ata_read_native_max_address_ext	-	LBA48 native max query
 *	@dev: Device to query
 *
 *	Perform an LBA48 size query upon the device in question. Return the
 *	actual LBA48 size or zero if the command fails.
 */

static u64 ata_read_native_max_address_ext(struct ata_device *dev)
{
	unsigned int err;
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;
	tf.device |= 0x40;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba48(&tf);
}

/**
 *	ata_read_native_max_address	-	LBA28 native max query
 *	@dev: Device to query
 *
 *	Performa an LBA28 size query upon the device in question. Return the
 *	actual LBA28 size or zero if the command fails.
 */

static u64 ata_read_native_max_address(struct ata_device *dev)
{
	unsigned int err;
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_READ_NATIVE_MAX;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;
	tf.device |= 0x40;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba(&tf);
}

/**
 *	ata_set_native_max_address_ext	-	LBA48 native max set
 *	@dev: Device to query
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 *	@new_sectors: new max sectors value to set for the device
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 *
 *	Perform an LBA48 size set max upon the device in question. Return the
 *	actual LBA48 size or zero if the command fails.
 */

static u64 ata_set_native_max_address_ext(struct ata_device *dev, u64 new_sectors)
{
	unsigned int err;
	struct ata_taskfile tf;

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_SET_MAX_EXT;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;
	tf.device |= 0x40;

	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;

	tf.hob_lbal = (new_sectors >> 24) & 0xff;
	tf.hob_lbam = (new_sectors >> 32) & 0xff;
	tf.hob_lbah = (new_sectors >> 40) & 0xff;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba48(&tf);
}

/**
 *	ata_set_native_max_address	-	LBA28 native max set
 *	@dev: Device to query
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 *	@new_sectors: new max sectors value to set for the device
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 *
 *	Perform an LBA28 size set max upon the device in question. Return the
 *	actual LBA28 size or zero if the command fails.
 */

static u64 ata_set_native_max_address(struct ata_device *dev, u64 new_sectors)
{
	unsigned int err;
	struct ata_taskfile tf;

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.command = ATA_CMD_SET_MAX;
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
	tf.protocol |= ATA_PROT_NODATA;

	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;
	tf.device |= ((new_sectors >> 24) & 0x0f) | 0x40;

	err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
	if (err)
		return 0;

	return ata_tf_to_lba(&tf);
}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
 */

static u64 ata_hpa_resize(struct ata_device *dev)
{
	u64 sectors = dev->n_sectors;
	u64 hpa_sectors;
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	if (ata_id_has_lba48(dev->id))
		hpa_sectors = ata_read_native_max_address_ext(dev);
	else
		hpa_sectors = ata_read_native_max_address(dev);

	/* if no hpa, both should be equal */
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	ata_dev_printk(dev, KERN_INFO, "%s 1: sectors = %lld, "
				"hpa_sectors = %lld\n",
		__FUNCTION__, (long long)sectors, (long long)hpa_sectors);
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	if (hpa_sectors > sectors) {
		ata_dev_printk(dev, KERN_INFO,
			"Host Protected Area detected:\n"
			"\tcurrent size: %lld sectors\n"
			"\tnative size: %lld sectors\n",
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			(long long)sectors, (long long)hpa_sectors);
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		if (ata_ignore_hpa) {
			if (ata_id_has_lba48(dev->id))
				hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
			else
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				hpa_sectors = ata_set_native_max_address(dev,
								hpa_sectors);
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			if (hpa_sectors) {
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				ata_dev_printk(dev, KERN_INFO, "native size "
					"increased to %lld sectors\n",
					(long long)hpa_sectors);
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				return hpa_sectors;
			}
		}
	}
	return sectors;
}

1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
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];
	}
}

1031 1032 1033
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
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 *	@unknown: mode to assume if we cannot tell
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 *
 *	Set up the timing values for the device based upon the identify
 *	reported values for the DMA mode. This function is used by drivers
 *	which rely upon firmware configured modes, but wish to report the
 *	mode correctly when possible.
 *
 *	In addition we emit similarly formatted messages to the default
 *	ata_dev_set_mode handler, in order to provide consistency of
 *	presentation.
 */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1158
 *	@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.
 */

1167
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",
1174 1175 1176 1177 1178
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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1179 1180 1181 1182 1183
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1184 1185 1186 1187 1188
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1189 1190
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1191 1192
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1193 1194
}

1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
/**
 *	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.
		 */
1224
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1225 1226 1227 1228
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

		/* 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;
1239

1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	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);
	}

1257 1258 1259
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1260 1261 1262 1263

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1264 1265 1266
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1267
 *	@fn: workqueue function to be scheduled
1268
 *	@data: data for @fn to use
1269
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
 *
 *	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.
 */
1283
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1284 1285 1286 1287
			 unsigned long delay)
{
	int rc;

1288
	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
T
Tejun Heo 已提交
1289 1290
		return;

1291 1292
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
Tejun Heo 已提交
1293

1294
	rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315

	/* 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");

1316
	spin_lock_irqsave(ap->lock, flags);
1317
	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
1318
	spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
1319 1320

	DPRINTK("flush #1\n");
1321
	cancel_work_sync(&ap->port_task.work); /* akpm: seems unneeded */
T
Tejun Heo 已提交
1322 1323 1324 1325 1326 1327 1328

	/*
	 * 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)) {
1329
		if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1330 1331
			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
					__FUNCTION__);
1332
		cancel_work_sync(&ap->port_task.work);
T
Tejun Heo 已提交
1333 1334
	}

1335
	spin_lock_irqsave(ap->lock, flags);
1336
	ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
1337
	spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
1338

1339 1340
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
Tejun Heo 已提交
1341 1342
}

1343
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1344
{
1345
	struct completion *waiting = qc->private_data;
1346 1347 1348 1349 1350

	complete(waiting);
}

/**
1351
 *	ata_exec_internal_sg - execute libata internal command
1352 1353
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1354
 *	@cdb: CDB for packet command
1355
 *	@dma_dir: Data tranfer direction of the command
1356 1357
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1358 1359 1360 1361 1362 1363 1364 1365 1366
 *
 *	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.
1367 1368 1369
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1370
 */
1371 1372 1373 1374
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)
1375
{
T
Tejun Heo 已提交
1376
	struct ata_port *ap = dev->ap;
1377 1378
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1379
	unsigned int tag, preempted_tag;
1380
	u32 preempted_sactive, preempted_qc_active;
1381
	DECLARE_COMPLETION_ONSTACK(wait);
1382
	unsigned long flags;
1383
	unsigned int err_mask;
1384
	int rc;
1385

1386
	spin_lock_irqsave(ap->lock, flags);
1387

1388
	/* no internal command while frozen */
1389
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1390
		spin_unlock_irqrestore(ap->lock, flags);
1391 1392 1393
		return AC_ERR_SYSTEM;
	}

1394
	/* initialize internal qc */
1395

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	/* 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;

1406
	if (test_and_set_bit(tag, &ap->qc_allocated))
1407
		BUG();
1408
	qc = __ata_qc_from_tag(ap, tag);
1409 1410 1411 1412 1413 1414 1415 1416

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

	preempted_tag = ap->active_tag;
1417 1418
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1419
	ap->active_tag = ATA_TAG_POISON;
1420 1421
	ap->sactive = 0;
	ap->qc_active = 0;
1422 1423

	/* prepare & issue qc */
1424
	qc->tf = *tf;
1425 1426
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1427
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1428 1429
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1430 1431 1432 1433 1434 1435
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1436
		qc->nbytes = buflen;
1437 1438
	}

1439
	qc->private_data = &wait;
1440 1441
	qc->complete_fn = ata_qc_complete_internal;

1442
	ata_qc_issue(qc);
1443

1444
	spin_unlock_irqrestore(ap->lock, flags);
1445

A
Andrew Morton 已提交
1446
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1447 1448

	ata_port_flush_task(ap);
1449

1450
	if (!rc) {
1451
		spin_lock_irqsave(ap->lock, flags);
1452 1453 1454

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1455 1456
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1457
		 */
1458
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1459 1460 1461 1462 1463 1464
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1465

1466 1467
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1468
					"qc timeout (cmd 0x%x)\n", command);
1469 1470
		}

1471
		spin_unlock_irqrestore(ap->lock, flags);
1472 1473
	}

1474 1475 1476 1477
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

		if (!qc->err_mask)
			qc->err_mask |= AC_ERR_OTHER;

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1488 1489
	}

1490
	/* finish up */
1491
	spin_lock_irqsave(ap->lock, flags);
1492

1493
	*tf = qc->result_tf;
1494 1495 1496
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1497
	ap->active_tag = preempted_tag;
1498 1499
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1500

1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
	/* 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.
	 */
1512
	if (ap->flags & ATA_FLAG_DISABLED) {
1513 1514 1515 1516
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1517
	spin_unlock_irqrestore(ap->lock, flags);
1518

1519
	return err_mask;
1520 1521
}

1522
/**
1523
 *	ata_exec_internal - execute libata internal command
1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
 *	@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)
{
1544 1545
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1546

1547 1548 1549 1550 1551 1552
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1553

1554
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1555 1556
}

1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
/**
 *	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
1570
 */
1571
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1572 1573 1574 1575 1576 1577 1578 1579 1580
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1581
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1582 1583
}

1584 1585 1586 1587 1588 1589 1590
/**
 *	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.
 */
J
Jeff Garzik 已提交
1591

1592 1593
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1594 1595 1596
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
	if (adev->ap->flags & ATA_FLAG_NO_IORDY)
1597
		return 0;
A
Alan Cox 已提交
1598 1599 1600 1601 1602
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1603
		return 1;
A
Alan Cox 已提交
1604 1605
	return 0;
}
1606

A
Alan Cox 已提交
1607 1608 1609 1610 1611 1612 1613
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
J
Jeff Garzik 已提交
1614

A
Alan Cox 已提交
1615 1616
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1617 1618
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1619
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1620 1621 1622 1623
		/* 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 */
A
Alan Cox 已提交
1624 1625
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1626 1627
		}
	}
A
Alan Cox 已提交
1628
	return 3 << ATA_SHIFT_PIO;
1629 1630
}

L
Linus Torvalds 已提交
1631
/**
1632 1633 1634
 *	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)
1635
 *	@flags: ATA_READID_* flags
1636
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1637
 *
1638 1639
 *	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
1640 1641
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1642 1643
 *
 *	LOCKING:
1644 1645 1646 1647
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1648
 */
1649
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1650
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1651
{
T
Tejun Heo 已提交
1652
	struct ata_port *ap = dev->ap;
1653
	unsigned int class = *p_class;
1654
	struct ata_taskfile tf;
1655 1656
	unsigned int err_mask = 0;
	const char *reason;
1657
	int may_fallback = 1, tried_spinup = 0;
1658
	int rc;
L
Linus Torvalds 已提交
1659

1660
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1661
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1662

1663 1664
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1665
	ata_tf_init(dev, &tf);
1666

1667 1668
	switch (class) {
	case ATA_DEV_ATA:
1669
		tf.command = ATA_CMD_ID_ATA;
1670 1671
		break;
	case ATA_DEV_ATAPI:
1672
		tf.command = ATA_CMD_ID_ATAPI;
1673 1674 1675 1676 1677
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1678 1679
	}

1680
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690

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

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1691

T
Tejun Heo 已提交
1692
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1693
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1694
	if (err_mask) {
1695
		if (err_mask & AC_ERR_NODEV_HINT) {
1696
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1697
				ap->print_id, dev->devno);
1698 1699 1700
			return -ENOENT;
		}

1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
		/* Device or controller might have reported the wrong
		 * device class.  Give a shot at the other IDENTIFY if
		 * the current one is aborted by the device.
		 */
		if (may_fallback &&
		    (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			may_fallback = 0;

			if (class == ATA_DEV_ATA)
				class = ATA_DEV_ATAPI;
			else
				class = ATA_DEV_ATA;
			goto retry;
		}

1716 1717
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1718 1719 1720
		goto err_out;
	}

1721 1722 1723 1724 1725
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1726
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1727

1728
	/* sanity check */
1729 1730 1731 1732 1733 1734 1735 1736 1737
	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;
1738 1739
	}

1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
		tried_spinup = 1;
		/*
		 * Drive powered-up in standby mode, and requires a specific
		 * SET_FEATURES spin-up subcommand before it will accept
		 * anything other than the original IDENTIFY command.
		 */
		ata_tf_init(dev, &tf);
		tf.command = ATA_CMD_SET_FEATURES;
		tf.feature = SETFEATURES_SPINUP;
		tf.protocol = ATA_PROT_NODATA;
		tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
		err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
		if (err_mask) {
			rc = -EIO;
			reason = "SPINUP failed";
			goto err_out;
		}
		/*
		 * If the drive initially returned incomplete IDENTIFY info,
		 * we now must reissue the IDENTIFY command.
		 */
		if (id[2] == 0x37c8)
			goto retry;
	}

1766
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1767 1768 1769 1770 1771 1772 1773 1774 1775
		/*
		 * 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
1776
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1777 1778 1779 1780 1781 1782 1783 1784 1785
			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.
			 */
1786
			flags &= ~ATA_READID_POSTRESET;
1787 1788 1789 1790 1791
			goto retry;
		}
	}

	*p_class = class;
1792

1793 1794 1795
	return 0;

 err_out:
T
Tejun Heo 已提交
1796
	if (ata_msg_warn(ap))
1797
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1798
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1799 1800 1801
	return rc;
}

T
Tejun Heo 已提交
1802
static inline u8 ata_dev_knobble(struct ata_device *dev)
1803
{
T
Tejun Heo 已提交
1804
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1805 1806
}

1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
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;
	}
1817 1818 1819 1820
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1821
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1822
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1823 1824 1825 1826 1827 1828 1829 1830 1831
		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);
}

1832
/**
1833 1834 1835 1836 1837
 *	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.
1838 1839
 *
 *	LOCKING:
1840 1841 1842 1843
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1844
 */
1845
int ata_dev_configure(struct ata_device *dev)
1846
{
T
Tejun Heo 已提交
1847
	struct ata_port *ap = dev->ap;
1848
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1849
	const u16 *id = dev->id;
1850
	unsigned int xfer_mask;
1851
	char revbuf[7];		/* XYZ-99\0 */
1852 1853
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1854
	int rc;
1855

1856
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1857 1858
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1859
		return 0;
1860 1861
	}

1862
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1863
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1864

1865
	/* set _SDD */
1866
	rc = ata_acpi_push_id(dev);
1867 1868 1869 1870 1871 1872 1873 1874
	if (rc) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set _SDD(%d)\n",
			rc);
	}

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

1875
	/* print device capabilities */
1876
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1877 1878 1879
		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",
1880
			       __FUNCTION__,
1881 1882
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1883

1884
	/* initialize to-be-configured parameters */
1885
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1886 1887 1888 1889 1890 1891 1892
	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
1893 1894 1895 1896
	/*
	 * common ATA, ATAPI feature tests
	 */

1897
	/* find max transfer mode; for printk only */
1898
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1899

1900 1901
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1902 1903 1904

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1905 1906
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1907 1908 1909
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1910 1911 1912 1913 1914
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1915
		dev->n_sectors = ata_id_n_sectors(id);
1916

1917
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1918
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1919 1920
				sizeof(fwrevbuf));

1921
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1922 1923 1924 1925 1926
				sizeof(modelbuf));

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

1927
		if (ata_id_has_lba(id)) {
1928
			const char *lba_desc;
1929
			char ncq_desc[20];
1930

1931 1932
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1933
			if (ata_id_has_lba48(id)) {
1934
				dev->flags |= ATA_DFLAG_LBA48;
1935
				lba_desc = "LBA48";
1936 1937 1938 1939

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1940
			}
1941

A
Alan Cox 已提交
1942 1943 1944
			if (ata_id_hpa_enabled(dev->id))
				dev->n_sectors = ata_hpa_resize(dev);

1945 1946 1947
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1948
			/* print device info to dmesg */
1949 1950 1951 1952 1953 1954 1955
			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",
1956
					(unsigned long long)dev->n_sectors,
1957 1958
					dev->multi_count, lba_desc, ncq_desc);
			}
1959
		} else {
1960 1961 1962
			/* CHS */

			/* Default translation */
1963 1964 1965
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1966

1967
			if (ata_id_current_chs_valid(id)) {
1968
				/* Current CHS translation is valid. */
1969 1970 1971
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1972 1973 1974
			}

			/* print device info to dmesg */
1975
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1976
				ata_dev_printk(dev, KERN_INFO,
1977 1978 1979
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1980
				ata_dev_printk(dev, KERN_INFO,
1981 1982 1983 1984 1985
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1986 1987
		}

1988
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1989 1990 1991
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1992
	else if (dev->class == ATA_DEV_ATAPI) {
1993 1994
		char *cdb_intr_string = "";

1995
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1996
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1997
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1998 1999
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2000
			rc = -EINVAL;
L
Linus Torvalds 已提交
2001 2002
			goto err_out_nosup;
		}
2003
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2004

2005
		if (ata_id_cdb_intr(dev->id)) {
2006
			dev->flags |= ATA_DFLAG_CDB_INTR;
2007 2008
			cdb_intr_string = ", CDB intr";
		}
2009

L
Linus Torvalds 已提交
2010
		/* print device info to dmesg */
2011
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
2012 2013 2014
			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
2015 2016
	}

2017 2018 2019 2020 2021
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
	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");
		}
	}

2034
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2035
	if (ata_dev_knobble(dev)) {
2036
		if (ata_msg_drv(ap) && print_info)
2037 2038
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2039
		dev->udma_mask &= ATA_UDMA5;
2040 2041 2042
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2043
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
2044 2045
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2046

2047 2048 2049 2050
	/* limit ATAPI DMA to R/W commands only */
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
		dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;

2051
	if (ap->ops->dev_config)
2052
		ap->ops->dev_config(dev);
2053

2054 2055 2056
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2057
	return 0;
L
Linus Torvalds 已提交
2058 2059

err_out_nosup:
2060
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2061 2062
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2063
	return rc;
L
Linus Torvalds 已提交
2064 2065
}

A
Alan Cox 已提交
2066
/**
2067
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2068 2069
 *	@ap: port
 *
2070
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2071 2072 2073 2074 2075 2076 2077 2078 2079
 *	detection.
 */

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

/**
2080
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2081 2082
 *	@ap: port
 *
2083
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115
 *	detection.
 */

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

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

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

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

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

L
Linus Torvalds 已提交
2116 2117 2118 2119
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2120 2121 2122 2123
 *	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
2124
 *	LOCKING:
J
Jeff Garzik 已提交
2125
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2126 2127
 *
 *	RETURNS:
2128
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2129 2130
 */

2131
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2132
{
2133
	unsigned int classes[ATA_MAX_DEVICES];
2134
	int tries[ATA_MAX_DEVICES];
2135
	int i, rc;
2136
	struct ata_device *dev;
L
Linus Torvalds 已提交
2137

2138
	ata_port_probe(ap);
2139

2140 2141 2142 2143
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
2144
	/* reset and determine device classes */
2145
	ap->ops->phy_reset(ap);
2146

2147 2148
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
2149

2150 2151 2152 2153 2154
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2155

2156
		dev->class = ATA_DEV_UNKNOWN;
2157
	}
L
Linus Torvalds 已提交
2158

2159
	ata_port_probe(ap);
2160

A
Alan Cox 已提交
2161 2162 2163 2164 2165 2166
	/* 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;

2167 2168 2169 2170 2171
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

	for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
2172
		dev = &ap->device[i];
2173

2174 2175
		if (tries[i])
			dev->class = classes[i];
2176

2177
		if (!ata_dev_enabled(dev))
2178 2179
			continue;

2180 2181
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2182 2183
		if (rc)
			goto fail;
2184 2185
	}

A
Alan Cox 已提交
2186 2187 2188 2189
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

2190 2191 2192 2193 2194 2195 2196
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

	for(i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;
2197

2198 2199 2200
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2201 2202
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2203 2204
	}

2205
	/* configure transfer mode */
2206
	rc = ata_set_mode(ap, &dev);
2207
	if (rc)
2208
		goto fail;
L
Linus Torvalds 已提交
2209

2210 2211 2212
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
2213

2214 2215
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
2216
	ap->ops->port_disable(ap);
2217
	return -ENODEV;
2218 2219

 fail:
2220 2221
	tries[dev->devno]--;

2222 2223
	switch (rc) {
	case -EINVAL:
2224
		/* eeek, something went very wrong, give up */
2225 2226
		tries[dev->devno] = 0;
		break;
2227 2228 2229 2230

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2231
	case -EIO:
2232 2233 2234 2235 2236 2237 2238
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
			sata_down_spd_limit(ap);
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2239 2240
	}

2241
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2242
		ata_dev_disable(dev);
2243

2244
	goto retry;
L
Linus Torvalds 已提交
2245 2246 2247
}

/**
J
Jeff Garzik 已提交
2248 2249
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2250
 *
J
Jeff Garzik 已提交
2251 2252 2253
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2254
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2255
 *	serialization.
L
Linus Torvalds 已提交
2256 2257 2258 2259
 */

void ata_port_probe(struct ata_port *ap)
{
2260
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2261 2262
}

2263 2264 2265 2266 2267 2268 2269 2270 2271
/**
 *	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.
 */
2272
void sata_print_link_status(struct ata_port *ap)
2273
{
2274
	u32 sstatus, scontrol, tmp;
2275

2276
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2277
		return;
2278
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2279

2280
	if (ata_port_online(ap)) {
2281
		tmp = (sstatus >> 4) & 0xf;
2282 2283 2284
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2285
	} else {
2286 2287 2288
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2289 2290 2291
	}
}

L
Linus Torvalds 已提交
2292
/**
J
Jeff Garzik 已提交
2293 2294
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2295
 *
J
Jeff Garzik 已提交
2296 2297 2298
 *	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
2299 2300
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2301
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2302 2303 2304 2305 2306 2307 2308 2309
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2310
		/* issue phy wake/reset */
2311
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2312 2313 2314
		/* 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
2315
	}
2316 2317
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2318 2319 2320 2321

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2322
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2323 2324 2325 2326
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2327 2328
	/* print link status */
	sata_print_link_status(ap);
2329

2330
	/* TODO: phy layer with polling, timeouts, etc. */
2331
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2332
		ata_port_probe(ap);
2333
	else
L
Linus Torvalds 已提交
2334 2335
		ata_port_disable(ap);

2336
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347
		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
2348 2349
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2350
 *
J
Jeff Garzik 已提交
2351 2352
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2353 2354
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2355
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2356 2357 2358 2359 2360
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2361
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2362 2363 2364 2365
		return;
	ata_bus_reset(ap);
}

2366 2367 2368 2369 2370 2371 2372
/**
 *	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
 */
2373

T
Tejun Heo 已提交
2374
struct ata_device *ata_dev_pair(struct ata_device *adev)
2375
{
T
Tejun Heo 已提交
2376
	struct ata_port *ap = adev->ap;
2377
	struct ata_device *pair = &ap->device[1 - adev->devno];
2378
	if (!ata_dev_enabled(pair))
2379 2380 2381 2382
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2383
/**
J
Jeff Garzik 已提交
2384 2385
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2386
 *
J
Jeff Garzik 已提交
2387 2388 2389 2390 2391
 *	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
2392
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2393
 *	serialization.
L
Linus Torvalds 已提交
2394 2395 2396 2397 2398 2399
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2400
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2401 2402
}

2403
/**
2404
 *	sata_down_spd_limit - adjust SATA spd limit downward
2405 2406 2407 2408
 *	@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
2409
 *	using sata_set_spd().
2410 2411 2412 2413 2414 2415 2416
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2417
int sata_down_spd_limit(struct ata_port *ap)
2418
{
2419 2420
	u32 sstatus, spd, mask;
	int rc, highbit;
2421

2422 2423 2424
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2425 2426 2427 2428 2429 2430 2431

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

2432
	spd = (sstatus >> 4) & 0xf;
2433 2434 2435 2436 2437 2438 2439 2440 2441
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2442 2443
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2444 2445 2446 2447

	return 0;
}

2448
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463
{
	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;
}

/**
2464
 *	sata_set_spd_needed - is SATA spd configuration needed
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477
 *	@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.
 */
2478
int sata_set_spd_needed(struct ata_port *ap)
2479 2480 2481
{
	u32 scontrol;

2482
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2483 2484
		return 0;

2485
	return __sata_set_spd_needed(ap, &scontrol);
2486 2487 2488
}

/**
2489
 *	sata_set_spd - set SATA spd according to spd limit
2490 2491 2492 2493 2494 2495 2496 2497 2498
 *	@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
2499
 *	changed.  Negative errno if SCR registers are inaccessible.
2500
 */
2501
int sata_set_spd(struct ata_port *ap)
2502 2503
{
	u32 scontrol;
2504
	int rc;
2505

2506 2507
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2508

2509
	if (!__sata_set_spd_needed(ap, &scontrol))
2510 2511
		return 0;

2512 2513 2514
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2515 2516 2517
	return 1;
}

A
Alan Cox 已提交
2518 2519 2520 2521 2522
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2523
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2524
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2525 2526 2527
 * 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
2528 2529 2530 2531 2532 2533 2534 2535 2536
 */

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 },

2537 2538
	{ 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
2539 2540 2541 2542 2543
	{ 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 }, */
2544

A
Alan Cox 已提交
2545 2546 2547
	{ 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 },
2548

A
Alan Cox 已提交
2549 2550 2551 2552
	{ 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 },

2553 2554
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
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Alan Cox 已提交
2555 2556 2557 2558 2559 2560 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 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599
	{ 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
2600
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2601
			return NULL;
2602
	return t;
A
Alan Cox 已提交
2603 2604 2605 2606 2607 2608 2609 2610 2611
}

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;

	/*
2612
	 * Find the mode.
2613
	 */
A
Alan Cox 已提交
2614 2615 2616 2617

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

2618 2619
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
	/*
	 * 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.
	 */

2640
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2641 2642

	/*
2643 2644 2645
	 * 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
2646 2647
	 */

2648
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2649 2650 2651 2652 2653
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2654
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665
	 */

	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;
	}
J
Jeff Garzik 已提交
2666

2667 2668 2669 2670 2671
	/* In a few cases quantisation may produce enough errors to
	   leave t->cycle too low for the sum of active and recovery
	   if so we must correct this */
	if (t->active + t->recover > t->cycle)
		t->cycle = t->active + t->recover;
A
Alan Cox 已提交
2672 2673 2674 2675

	return 0;
}

2676 2677 2678
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2679
 *	@sel: ATA_DNXFER_* selector
2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690
 *
 *	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
 */
2691
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2692
{
2693 2694 2695 2696
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2697

2698 2699
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2700

2701 2702 2703 2704
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2705

2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 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
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

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

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

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

	default:
		BUG();
	}

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

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

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

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
2758 2759 2760 2761 2762 2763 2764

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

	return 0;
}

T
Tejun Heo 已提交
2765
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2766
{
2767
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2768 2769
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2770

2771
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2772 2773 2774
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2775
	err_mask = ata_dev_set_xfermode(dev);
2776 2777 2778 2779
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
        	err_mask &= ~AC_ERR_DEV;

2780
	if (err_mask) {
2781 2782
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2783 2784
		return -EIO;
	}
L
Linus Torvalds 已提交
2785

2786
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2787
	rc = ata_dev_revalidate(dev, 0);
2788
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2789
	if (rc)
2790
		return rc;
2791

2792 2793
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2794

2795 2796
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2797
	return 0;
L
Linus Torvalds 已提交
2798 2799 2800
}

/**
2801
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
L
Linus Torvalds 已提交
2802
 *	@ap: port on which timings will be programmed
2803
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2804
 *
2805 2806 2807
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
2808
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2809
 *
L
Linus Torvalds 已提交
2810
 *	LOCKING:
J
Jeff Garzik 已提交
2811
 *	PCI/etc. bus probe sem.
2812 2813 2814
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2815
 */
2816 2817

int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2818
{
2819
	struct ata_device *dev;
2820
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2821

2822

2823 2824
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2825
		unsigned int pio_mask, dma_mask;
2826

2827 2828
		dev = &ap->device[i];

2829
		if (!ata_dev_enabled(dev))
2830 2831
			continue;

T
Tejun Heo 已提交
2832
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2833

2834 2835 2836 2837
		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);
2838

2839
		found = 1;
2840 2841
		if (dev->dma_mode)
			used_dma = 1;
2842
	}
2843
	if (!found)
2844
		goto out;
2845 2846

	/* step 2: always set host PIO timings */
2847 2848 2849 2850 2851 2852
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2853
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2854
			rc = -EINVAL;
2855
			goto out;
2856 2857 2858 2859 2860 2861 2862
		}

		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
2863

2864
	/* step 3: set host DMA timings */
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875
	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
2876 2877

	/* step 4: update devices' xfer mode */
2878
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2879
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2880

A
Alan 已提交
2881
		/* don't update suspended devices' xfer mode */
2882
		if (!ata_dev_enabled(dev))
2883 2884
			continue;

T
Tejun Heo 已提交
2885
		rc = ata_dev_set_mode(dev);
2886
		if (rc)
2887
			goto out;
2888
	}
L
Linus Torvalds 已提交
2889

2890 2891
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2892
	 */
J
Jeff Garzik 已提交
2893
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2894
		ap->host->simplex_claimed = ap;
2895

2896 2897 2898 2899
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2900 2901
}

2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
 *	@r_failed_dev: out paramter for failed device
 *
 *	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.
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
{
	/* has private set_mode? */
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
	return ata_do_set_mode(ap, r_failed_dev);
}

2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
/**
 *	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
2935
 *	spin_lock_irqsave(host lock)
2936 2937 2938 2939 2940 2941 2942 2943 2944
 */

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
2945 2946 2947 2948 2949 2950
/**
 *	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
2951 2952 2953
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2954 2955 2956 2957 2958
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2959
 */
2960 2961
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2962 2963 2964 2965 2966 2967 2968
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2969 2970
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2971 2972 2973 2974
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2975
	if (status != 0xff && (status & ATA_BUSY))
2976
		ata_port_printk(ap, KERN_WARNING,
2977 2978
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2979 2980

	timeout = timer_start + tmout;
2981 2982
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2983 2984 2985 2986
		msleep(50);
		status = ata_chk_status(ap);
	}

2987 2988 2989
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2990
	if (status & ATA_BUSY) {
2991
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2992 2993
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2994
		return -EBUSY;
L
Linus Torvalds 已提交
2995 2996 2997 2998 2999
	}

	return 0;
}

3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
/**
 *	ata_wait_ready - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	Sleep until ATA Status register bit BSY clears, or timeout
 *	occurs.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
{
	unsigned long start = jiffies;
	int warned = 0;

	while (1) {
		u8 status = ata_chk_status(ap);
		unsigned long now = jiffies;

		if (!(status & ATA_BUSY))
			return 0;
3025
		if (!ata_port_online(ap) && status == 0xff)
3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043
			return -ENODEV;
		if (time_after(now, deadline))
			return -EBUSY;

		if (!warned && time_after(now, start + 5 * HZ) &&
		    (deadline - now > 3 * HZ)) {
			ata_port_printk(ap, KERN_WARNING,
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
			warned = 1;
		}

		msleep(50);
	}
}

static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
			      unsigned long deadline)
L
Linus Torvalds 已提交
3044 3045 3046 3047
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3048
	int rc, ret = 0;
L
Linus Torvalds 已提交
3049 3050 3051 3052

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3053 3054
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3055 3056 3057 3058 3059
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3060
	}
L
Linus Torvalds 已提交
3061 3062 3063 3064 3065 3066 3067 3068

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

		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3069 3070
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
3071 3072
		if ((nsect == 1) && (lbal == 1))
			break;
3073 3074
		if (time_after(jiffies, deadline))
			return -EBUSY;
L
Linus Torvalds 已提交
3075 3076
		msleep(50);	/* give drive a breather */
	}
3077 3078
	if (dev1) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3079 3080 3081 3082 3083
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3084
	}
L
Linus Torvalds 已提交
3085 3086 3087 3088 3089 3090 3091

	/* 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);
3092

T
Tejun Heo 已提交
3093
	return ret;
L
Linus Torvalds 已提交
3094 3095
}

3096 3097
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3098 3099 3100
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3101
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3102 3103

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3104 3105 3106 3107 3108
	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
3109 3110 3111 3112 3113 3114 3115 3116

	/* 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.
3117 3118
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3119 3120 3121
	 */
	msleep(150);

3122
	/* Before we perform post reset processing we want to see if
3123 3124 3125
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3126
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3127
		return -ENODEV;
3128

3129
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144
}

/**
 *	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
3145
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3146
 *	Obtains host lock.
L
Linus Torvalds 已提交
3147 3148
 *
 *	SIDE EFFECTS:
3149
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3150 3151 3152 3153 3154 3155 3156
 */

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
3157
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3158
	int rc;
L
Linus Torvalds 已提交
3159

T
Tejun Heo 已提交
3160
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179

	/* 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 */
T
Tejun Heo 已提交
3180 3181 3182
	if (ap->flags & ATA_FLAG_SRST) {
		rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
		if (rc && rc != -ENODEV)
T
Tejun Heo 已提交
3183
			goto err_out;
T
Tejun Heo 已提交
3184
	}
L
Linus Torvalds 已提交
3185 3186 3187 3188

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3189
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
3190
	if ((slave_possible) && (err != 0x81))
3191
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
3192 3193

	/* re-enable interrupts */
3194
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208

	/* 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
3209
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3210 3211 3212 3213 3214 3215
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3216
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
3217 3218 3219 3220 3221
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

3222 3223 3224 3225
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3226
 *	@deadline: deadline jiffies for the operation
3227 3228 3229 3230
 *
 *	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
3231 3232
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3233 3234
 *	until timeout then returns 0 if DET is stable at 1.
 *
3235 3236 3237
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3238 3239 3240 3241 3242 3243
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3244 3245
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
		      unsigned long deadline)
3246
{
3247
	unsigned long interval_msec = params[0];
3248 3249
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3250 3251 3252
	u32 last, cur;
	int rc;

3253 3254 3255 3256
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271
	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) {
3272
			if (cur == 1 && time_before(jiffies, deadline))
3273 3274 3275 3276 3277 3278 3279 3280 3281 3282
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

		/* unstable, start over */
		last = cur;
		last_jiffies = jiffies;

3283 3284
		/* check deadline */
		if (time_after(jiffies, deadline))
3285 3286 3287 3288 3289 3290 3291 3292
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3293
 *	@deadline: deadline jiffies for the operation
3294 3295 3296 3297 3298 3299 3300 3301 3302
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3303 3304
int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
		    unsigned long deadline)
3305 3306
{
	u32 scontrol;
3307 3308 3309 3310
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
3311

3312
	scontrol = (scontrol & 0x0f0) | 0x300;
3313 3314 3315

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
3316

3317 3318 3319 3320
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3321

3322
	return sata_phy_debounce(ap, params, deadline);
3323 3324
}

3325 3326 3327
/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
3328
 *	@deadline: deadline jiffies for the operation
3329
 *
T
Tejun Heo 已提交
3330 3331 3332 3333 3334
 *	@ap is about to be reset.  Initialize it.  Failure from
 *	prereset makes libata abort whole reset sequence and give up
 *	that port, so prereset should be best-effort.  It does its
 *	best to prepare for reset sequence but if things go wrong, it
 *	should just whine, not fail.
3335 3336 3337 3338 3339 3340 3341
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3342
int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
3343 3344
{
	struct ata_eh_context *ehc = &ap->eh_context;
3345
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3346 3347
	int rc;

T
Tejun Heo 已提交
3348
	/* handle link resume */
3349 3350 3351 3352
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

3353 3354 3355 3356 3357 3358
	/* 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) {
3359
		rc = sata_phy_resume(ap, timing, deadline);
T
Tejun Heo 已提交
3360 3361
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3362 3363 3364 3365 3366 3367 3368
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"link for reset (errno=%d)\n", 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.
	 */
T
Tejun Heo 已提交
3369 3370
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
		rc = ata_wait_ready(ap, deadline);
3371
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3372 3373 3374 3375 3376
			ata_port_printk(ap, KERN_WARNING, "device not ready "
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3377 3378 3379 3380

	return 0;
}

3381 3382 3383 3384
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
3385
 *	@deadline: deadline jiffies for the operation
3386
 *
3387
 *	Reset host port using ATA SRST.
3388 3389 3390 3391 3392 3393 3394
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3395 3396
int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
		      unsigned long deadline)
3397 3398
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3399 3400
	unsigned int devmask = 0;
	int rc;
3401 3402 3403 3404
	u8 err;

	DPRINTK("ENTER\n");

3405
	if (ata_port_offline(ap)) {
3406 3407 3408 3409
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420
	/* 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);
3421
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3422 3423
	/* if link is occupied, -ENODEV too is an error */
	if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
3424 3425
		ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
		return rc;
3426 3427 3428 3429 3430 3431 3432
	}

	/* 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);

3433
 out:
3434 3435 3436 3437 3438
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3439
 *	sata_port_hardreset - reset port via SATA phy reset
3440
 *	@ap: port to reset
3441
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3442
 *	@deadline: deadline jiffies for the operation
3443 3444 3445 3446 3447 3448 3449 3450 3451
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3452 3453
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
			unsigned long deadline)
3454
{
3455
	u32 scontrol;
3456
	int rc;
3457

3458 3459
	DPRINTK("ENTER\n");

3460
	if (sata_set_spd_needed(ap)) {
3461 3462 3463 3464 3465
		/* 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.
		 */
3466
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3467
			goto out;
3468

3469
		scontrol = (scontrol & 0x0f0) | 0x304;
3470 3471

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3472
			goto out;
3473

3474
		sata_set_spd(ap);
3475 3476 3477
	}

	/* issue phy wake/reset */
3478
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3479
		goto out;
3480

3481
	scontrol = (scontrol & 0x0f0) | 0x301;
3482 3483

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3484
		goto out;
3485

3486
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3487 3488 3489 3490
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3491
	/* bring phy back */
3492
	rc = sata_phy_resume(ap, timing, deadline);
3493 3494 3495 3496 3497 3498 3499 3500 3501
 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
3502
 *	@deadline: deadline jiffies for the operation
3503 3504 3505 3506 3507 3508 3509 3510 3511 3512
 *
 *	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.
 */
3513 3514
int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
		       unsigned long deadline)
3515 3516 3517 3518 3519 3520 3521
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
3522
	rc = sata_port_hardreset(ap, timing, deadline);
3523 3524 3525 3526 3527
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3528 3529

	/* TODO: phy layer with polling, timeouts, etc. */
3530
	if (ata_port_offline(ap)) {
3531 3532 3533 3534 3535
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3536 3537 3538
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3539
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3540 3541
	/* link occupied, -ENODEV too is an error */
	if (rc) {
3542
		ata_port_printk(ap, KERN_ERR,
3543 3544
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3545 3546
	}

3547 3548
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568
	*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)
{
3569 3570
	u32 serror;

3571 3572 3573
	DPRINTK("ENTER\n");

	/* print link status */
3574
	sata_print_link_status(ap);
3575

3576 3577 3578 3579
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3580
	/* re-enable interrupts */
3581 3582
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3583 3584 3585 3586 3587 3588 3589

	/* 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);

3590 3591 3592 3593 3594 3595 3596
	/* 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
3597 3598
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3599 3600 3601 3602

	DPRINTK("EXIT\n");
}

3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618
/**
 *	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
3619 3620
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3621 3622
{
	const u16 *old_id = dev->id;
3623 3624
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3625 3626

	if (dev->class != new_class) {
3627 3628
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3629 3630 3631
		return 0;
	}

3632 3633 3634 3635
	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]));
3636 3637

	if (strcmp(model[0], model[1])) {
3638 3639
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3640 3641 3642 3643
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3644 3645
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3646 3647 3648 3649 3650 3651 3652
		return 0;
	}

	return 1;
}

/**
3653 3654
 *	ata_dev_reread_id - Re-read IDENTIFY data
 *	@adev: target ATA device
3655
 *	@readid_flags: read ID flags
3656 3657 3658 3659 3660 3661 3662 3663 3664 3665
 *
 *	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
 */
3666
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3667
{
3668
	unsigned int class = dev->class;
3669
	u16 *id = (void *)dev->ap->sector_buf;
3670 3671
	int rc;

3672
	/* read ID data */
3673
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3674
	if (rc)
3675
		return rc;
3676 3677

	/* is the device still there? */
3678 3679
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3680

3681
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
 *	@readid_flags: read ID flags
 *
 *	Re-read IDENTIFY page, make sure @dev is still attached to the
 *	port and reconfigure it according to the new IDENTIFY page.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
{
3701
	u64 n_sectors = dev->n_sectors;
3702 3703 3704 3705 3706 3707 3708 3709 3710
	int rc;

	if (!ata_dev_enabled(dev))
		return -ENODEV;

	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3711 3712

	/* configure device according to the new ID */
3713
	rc = ata_dev_configure(dev);
3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
	if (dev->class == ATA_DEV_ATA && dev->n_sectors != n_sectors) {
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
		rc = -ENODEV;
		goto fail;
	}

	return 0;
3728 3729

 fail:
3730
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3731 3732 3733
	return rc;
}

3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },
3771
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3772

3773
	/* Weird ATAPI devices */
3774 3775
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |
						ATA_HORKAGE_DMA_RW_ONLY },
3776

3777 3778 3779 3780 3781
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3782 3783
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3784 3785
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3786
	{ "Maxtor 6B200M0",	"BANC1B10",	ATA_HORKAGE_NONCQ },
3787 3788
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3789 3790 3791 3792 3793
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
3794 3795 3796 3797 3798

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3799
};
3800

3801
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3802
{
T
Tejun Heo 已提交
3803 3804
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3805
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3806

T
Tejun Heo 已提交
3807 3808
	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
3809

3810
	while (ad->model_num) {
T
Tejun Heo 已提交
3811
		if (!strcmp(ad->model_num, model_num)) {
3812 3813
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3814
			if (!strcmp(ad->model_rev, model_rev))
3815
				return ad->horkage;
3816
		}
3817
		ad++;
3818
	}
L
Linus Torvalds 已提交
3819 3820 3821
	return 0;
}

3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833
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;
}

3834 3835 3836 3837
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3838 3839 3840 3841
 *	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...
3842 3843 3844 3845
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3846
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3847
{
T
Tejun Heo 已提交
3848
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3849
	struct ata_host *host = ap->host;
3850
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3851

3852
	/* controller modes available */
3853 3854 3855
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3856
	/* drive modes available */
3857 3858 3859
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3860

3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871
	/*
	 *	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));
	}

3872 3873
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3874 3875
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3876
	}
3877

3878 3879
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3880 3881 3882
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3883
	}
3884

J
Jeff Garzik 已提交
3885 3886 3887
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

3888
	if (ap->ops->mode_filter)
3889
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3890

3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

3910 3911
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3912 3913 3914 3915 3916 3917
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3918 3919 3920
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3921
 *	LOCKING:
J
Jeff Garzik 已提交
3922
 *	PCI/etc. bus probe sem.
3923 3924 3925
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3926 3927
 */

T
Tejun Heo 已提交
3928
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3929
{
3930
	struct ata_taskfile tf;
3931
	unsigned int err_mask;
L
Linus Torvalds 已提交
3932 3933 3934 3935

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

T
Tejun Heo 已提交
3936
	ata_tf_init(dev, &tf);
3937 3938 3939 3940 3941
	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
3942

T
Tejun Heo 已提交
3943
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3944

3945 3946
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3947 3948
}

3949 3950 3951
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3952 3953
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3954 3955
 *
 *	LOCKING:
3956 3957 3958 3959
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3960
 */
T
Tejun Heo 已提交
3961 3962
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3963
{
3964
	struct ata_taskfile tf;
3965
	unsigned int err_mask;
3966 3967 3968

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3969
		return AC_ERR_INVALID;
3970 3971 3972 3973

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

T
Tejun Heo 已提交
3974
	ata_tf_init(dev, &tf);
3975 3976 3977 3978 3979
	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 */
3980

T
Tejun Heo 已提交
3981
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3982

3983 3984
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3985 3986
}

L
Linus Torvalds 已提交
3987
/**
J
Jeff Garzik 已提交
3988 3989 3990 3991
 *	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
3992 3993
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3994
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3995
 */
3996
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3997 3998
{
	struct ata_port *ap = qc->ap;
3999
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4000
	int dir = qc->dma_dir;
4001
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4002

4003 4004
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4005 4006

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4007
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4008

J
Jeff Garzik 已提交
4009
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4010

4011 4012 4013 4014 4015 4016 4017 4018
	/* 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) {
4019
		if (qc->n_elem)
4020
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4021 4022 4023 4024 4025 4026
		/* 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);
4027
			kunmap_atomic(addr, KM_IRQ0);
4028 4029
		}
	} else {
4030
		if (qc->n_elem)
4031
			dma_unmap_single(ap->dev,
4032 4033
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4034 4035 4036 4037 4038 4039
		/* 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
4040 4041

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4042
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4043 4044 4045 4046 4047 4048
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4049 4050 4051
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4052
 *	LOCKING:
J
Jeff Garzik 已提交
4053
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4054 4055 4056 4057 4058
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4059 4060
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4061

4062
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4063
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4064 4065

	idx = 0;
4066
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099
		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
4100 4101 4102 4103
 *	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
4104
 *	LOCKING:
J
Jeff Garzik 已提交
4105
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4106
 *
L
Linus Torvalds 已提交
4107 4108 4109 4110 4111 4112 4113 4114
 *	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 */

4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134
	/* some drives can only do ATAPI DMA on read/write */
	if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
		struct scsi_cmnd *cmd = qc->scsicmd;
		u8 *scsicmd = cmd->cmnd;

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

L
Linus Torvalds 已提交
4135 4136 4137 4138 4139 4140 4141 4142 4143
	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
4144 4145
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4146
 *	LOCKING:
J
Jeff Garzik 已提交
4147
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4148 4149 4150 4151 4152 4153 4154 4155 4156
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4157 4158
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4159 4160 4161 4162 4163 4164 4165 4166 4167 4168
/**
 *	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
4169
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4170 4171
 */

L
Linus Torvalds 已提交
4172 4173 4174 4175
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4176
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4177
	qc->n_elem = 1;
4178
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4179
	qc->buf_virt = buf;
4180
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4181

4182
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4183 4184
}

J
Jeff Garzik 已提交
4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195
/**
 *	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
4196
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4197 4198
 */

L
Linus Torvalds 已提交
4199 4200 4201 4202
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4203
	qc->__sg = sg;
L
Linus Torvalds 已提交
4204
	qc->n_elem = n_elem;
4205
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4206 4207 4208
}

/**
J
Jeff Garzik 已提交
4209 4210 4211 4212
 *	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
4213 4214
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4215
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4216 4217
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4218
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4219 4220 4221 4222 4223 4224
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4225
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4226
	dma_addr_t dma_address;
4227
	int trim_sg = 0;
L
Linus Torvalds 已提交
4228

4229 4230 4231 4232 4233 4234
	/* 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;

4235
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246

		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;
4247 4248
		if (sg->length == 0)
			trim_sg = 1;
4249 4250 4251 4252 4253

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

4254 4255
	if (trim_sg) {
		qc->n_elem--;
4256 4257 4258
		goto skip_map;
	}

4259
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4260
				     sg->length, dir);
4261 4262 4263
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4264
		return -1;
4265
	}
L
Linus Torvalds 已提交
4266 4267

	sg_dma_address(sg) = dma_address;
4268
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4269

4270
skip_map:
L
Linus Torvalds 已提交
4271 4272 4273 4274 4275 4276 4277
	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
4278 4279 4280 4281
 *	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
4282 4283
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4284
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4285 4286
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4287
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4288 4289 4290 4291 4292 4293
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4294 4295
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4296
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4297

T
Tejun Heo 已提交
4298
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4299
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4300

4301 4302 4303 4304 4305 4306 4307
	/* 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;

4308
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322

		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);
4323
			kunmap_atomic(addr, KM_IRQ0);
4324 4325 4326 4327 4328 4329
		}

		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;
4330 4331
		if (lsg->length == 0)
			trim_sg = 1;
4332 4333 4334 4335 4336

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

4337 4338 4339 4340 4341 4342 4343 4344 4345
	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
4346
	dir = qc->dma_dir;
4347
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4348 4349 4350
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4351
		return -1;
4352
	}
L
Linus Torvalds 已提交
4353 4354 4355

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

4356
skip_map:
L
Linus Torvalds 已提交
4357 4358 4359 4360 4361
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4362
/**
4363
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4364 4365 4366 4367 4368 4369 4370 4371
 *	@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
4372
 *	Inherited from caller.
E
Edward Falk 已提交
4373
 */
L
Linus Torvalds 已提交
4374 4375 4376 4377 4378 4379 4380 4381 4382 4383
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
4384
/**
T
Tejun Heo 已提交
4385
 *	ata_data_xfer - Transfer data by PIO
4386
 *	@adev: device to target
A
Albert Lee 已提交
4387 4388
 *	@buf: data buffer
 *	@buflen: buffer length
4389
 *	@write_data: read/write
A
Albert Lee 已提交
4390 4391 4392 4393 4394 4395
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4396 4397
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4398
{
4399
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4400
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4401

A
Albert Lee 已提交
4402
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4403
	if (write_data)
T
Tejun Heo 已提交
4404
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4405
	else
T
Tejun Heo 已提交
4406
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4407 4408 4409 4410 4411 4412 4413 4414

	/* 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
4415
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4416
		} else {
T
Tejun Heo 已提交
4417
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4418 4419 4420
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4421 4422
}

4423
/**
T
Tejun Heo 已提交
4424
 *	ata_data_xfer_noirq - Transfer data by PIO
4425 4426 4427 4428 4429
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4430
 *	Transfer data from/to the device data register by PIO. Do the
4431 4432 4433 4434 4435
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4436 4437
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4438 4439 4440
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4441
	ata_data_xfer(adev, buf, buflen, write_data);
4442 4443 4444 4445
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4446
/**
4447
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4448 4449
 *	@qc: Command on going
 *
4450
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4451 4452 4453 4454 4455
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4456 4457 4458
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4459
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4460 4461 4462 4463 4464
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4465
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4466
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4467 4468

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4469
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4470 4471 4472 4473 4474 4475 4476

	/* 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");

4477 4478 4479
	if (PageHighMem(page)) {
		unsigned long flags;

4480
		/* FIXME: use a bounce buffer */
4481 4482
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4483

4484
		/* do the actual data transfer */
4485
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4486

4487 4488 4489 4490
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4491
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4492
	}
L
Linus Torvalds 已提交
4493

4494 4495
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4496

T
Tejun Heo 已提交
4497
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4498 4499 4500 4501 4502
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4503
/**
4504
 *	ata_pio_sectors - Transfer one or many sectors.
4505 4506
 *	@qc: Command on going
 *
4507
 *	Transfer one or many sectors of data from/to the
4508 4509 4510 4511 4512
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4513

4514 4515 4516 4517 4518 4519
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
4520
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4521

4522
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4523
			    qc->dev->multi_count);
4524 4525 4526 4527 4528 4529
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545
/**
 *	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");
4546
	WARN_ON(qc->dev->cdb_len < 12);
4547

4548
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563
	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
4564 4565
}

A
Albert Lee 已提交
4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577
/**
 *	__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
4578 4579 4580
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4581
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4582 4583 4584 4585 4586
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4587
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4588
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4589 4590

next_sg:
4591
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4592
		/*
4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603
		 * 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 */
4604 4605
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4606 4607

		for (i = 0; i < words; i++)
4608
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4609

A
Albert Lee 已提交
4610
		ap->hsm_task_state = HSM_ST_LAST;
4611 4612 4613
		return;
	}

4614
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4615 4616 4617 4618 4619 4620 4621 4622

	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;

4623
	/* don't overrun current sg */
4624
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4625 4626 4627 4628

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

4629 4630
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4631 4632 4633
	if (PageHighMem(page)) {
		unsigned long flags;

4634
		/* FIXME: use bounce buffer */
4635 4636
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4637

4638
		/* do the actual data transfer */
4639
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4640

4641 4642 4643 4644
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4645
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4646
	}
L
Linus Torvalds 已提交
4647 4648 4649 4650 4651

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

4652
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4653 4654 4655 4656
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4657
	if (bytes)
L
Linus Torvalds 已提交
4658 4659 4660
		goto next_sg;
}

A
Albert Lee 已提交
4661 4662 4663 4664 4665 4666 4667 4668 4669 4670
/**
 *	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
4671 4672 4673 4674 4675 4676 4677
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;

4678 4679 4680 4681 4682 4683 4684 4685 4686 4687
	/* 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
4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698
	bytes = (bc_hi << 8) | bc_lo;

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

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

T
Tejun Heo 已提交
4699
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4700

L
Linus Torvalds 已提交
4701 4702 4703 4704 4705
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4706
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4707
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4708
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4709 4710 4711
}

/**
4712 4713 4714
 *	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
4715
 *
4716 4717
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4718
 */
4719 4720

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4721
{
4722 4723
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4724

4725 4726 4727 4728
	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
4729

4730 4731 4732
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4733 4734
	}

4735 4736
	return 0;
}
L
Linus Torvalds 已提交
4737

T
Tejun Heo 已提交
4738 4739 4740 4741 4742 4743 4744 4745
/**
 *	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
4746
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4747 4748 4749 4750 4751 4752 4753 4754 4755
 *	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) {
4756
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4757

J
Jeff Garzik 已提交
4758 4759
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4760 4761 4762 4763
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4764
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4765 4766 4767 4768 4769
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4770
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4771 4772 4773 4774 4775 4776 4777 4778
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4779
			spin_lock_irqsave(ap->lock, flags);
4780
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4781
			ata_qc_complete(qc);
4782
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4783 4784 4785
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4786

4787
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4788 4789
}

4790 4791 4792 4793 4794 4795 4796 4797 4798 4799
/**
 *	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.
 */
4800 4801
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4802
{
4803 4804 4805
	unsigned long flags = 0;
	int poll_next;

4806 4807
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4808 4809 4810 4811
	/* 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).
	 */
4812
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4813

4814
fsm_start:
4815
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4816
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4817

4818 4819
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4820 4821 4822 4823 4824 4825 4826 4827
		/* 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);

4828
		/* check device status */
4829 4830 4831 4832 4833 4834 4835 4836 4837
		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
4838
			ap->hsm_task_state = HSM_ST_ERR;
4839
			goto fsm_start;
L
Linus Torvalds 已提交
4840 4841
		}

4842 4843
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4844 4845 4846
		 * 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.
4847 4848
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4849 4850
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4851
			qc->err_mask |= AC_ERR_HSM;
4852 4853
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4854
		}
L
Linus Torvalds 已提交
4855

4856 4857 4858 4859 4860 4861
		/* 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)
4862
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4863

4864 4865 4866 4867
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4868

4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880
			/* 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)
4881
			spin_unlock_irqrestore(ap->lock, flags);
4882 4883 4884 4885

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4886
		break;
4887

4888 4889 4890 4891 4892
	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) {
4893 4894 4895
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4896 4897 4898
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4899

4900 4901
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4902 4903 4904
			 * 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.
4905 4906
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4907 4908 4909
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4910
				qc->err_mask |= AC_ERR_HSM;
4911 4912
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4913
			}
L
Linus Torvalds 已提交
4914

4915
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4916

4917 4918 4919
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4920

4921 4922 4923 4924
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4925 4926 4927 4928
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4929 4930 4931 4932 4933 4934
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4935

4936 4937 4938
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4939

4940 4941 4942 4943 4944 4945 4946 4947 4948
			/* 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.
4949 4950 4951 4952
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4953 4954 4955 4956 4957 4958 4959

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

4960 4961 4962
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4963 4964 4965 4966 4967 4968
				/* 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;
4969 4970
			}

4971 4972 4973 4974 4975 4976
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4977
				status = ata_wait_idle(ap);
4978 4979 4980 4981 4982
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4983
		poll_next = 1;
L
Linus Torvalds 已提交
4984 4985
		break;

A
Albert Lee 已提交
4986
	case HSM_ST_LAST:
4987 4988
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4989 4990 4991 4992 4993
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4994
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4995
			ap->print_id, qc->dev->devno, status);
4996

4997 4998
		WARN_ON(qc->err_mask);

4999
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5000

5001
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5002
		ata_hsm_qc_complete(qc, in_wq);
5003 5004

		poll_next = 0;
L
Linus Torvalds 已提交
5005 5006
		break;

A
Albert Lee 已提交
5007
	case HSM_ST_ERR:
5008 5009 5010 5011 5012 5013
		/* 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;
5014

5015
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5016
		ata_hsm_qc_complete(qc, in_wq);
5017 5018

		poll_next = 0;
5019 5020
		break;
	default:
5021
		poll_next = 0;
5022
		BUG();
L
Linus Torvalds 已提交
5023 5024
	}

5025
	return poll_next;
L
Linus Torvalds 已提交
5026 5027
}

5028
static void ata_pio_task(struct work_struct *work)
5029
{
5030 5031 5032
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5033
	u8 status;
5034
	int poll_next;
5035

J
Jeff Garzik 已提交
5036
fsm_start:
5037
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5038

5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050
	/*
	 * 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) {
5051
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5052 5053
			return;
		}
5054 5055
	}

5056 5057
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5058

5059 5060 5061 5062
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5063
		goto fsm_start;
5064 5065
}

L
Linus Torvalds 已提交
5066 5067 5068 5069 5070 5071
/**
 *	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
5072
 *	None.
L
Linus Torvalds 已提交
5073 5074 5075 5076 5077 5078 5079
 */

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

5080
	/* no command while frozen */
5081
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5082 5083
		return NULL;

5084 5085
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5086
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5087
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101
			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
5102
 *	None.
L
Linus Torvalds 已提交
5103 5104
 */

T
Tejun Heo 已提交
5105
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5106
{
T
Tejun Heo 已提交
5107
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
5108 5109 5110 5111 5112 5113 5114 5115
	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
5116
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129
	}

	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
5130
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5131 5132 5133
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5134 5135 5136
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5137
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5138

5139 5140 5141 5142
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5143
		clear_bit(tag, &ap->qc_allocated);
5144
	}
L
Linus Torvalds 已提交
5145 5146
}

5147
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5148
{
5149 5150
	struct ata_port *ap = qc->ap;

5151 5152
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5153 5154 5155 5156

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

5157
	/* command should be marked inactive atomically with qc completion */
5158 5159 5160 5161
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
5162

5163 5164 5165 5166 5167
	/* 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;
5168
	ap->qc_active &= ~(1 << qc->tag);
5169

L
Linus Torvalds 已提交
5170
	/* call completion callback */
5171
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5172 5173
}

5174 5175 5176 5177 5178
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5179
	ap->ops->tf_read(ap, &qc->result_tf);
5180 5181
}

5182 5183 5184 5185 5186 5187 5188 5189 5190
/**
 *	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
5191
 *	spin_lock_irqsave(host lock)
5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210
 */
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) {
5211
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5212 5213 5214 5215 5216 5217 5218

		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 */
5219
				fill_result_tf(qc);
5220 5221 5222 5223 5224 5225 5226
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5227
			fill_result_tf(qc);
5228 5229 5230 5231 5232 5233 5234 5235

		__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)
5236
			fill_result_tf(qc);
5237 5238 5239 5240 5241

		__ata_qc_complete(qc);
	}
}

5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253
/**
 *	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
5254
 *	spin_lock_irqsave(host lock)
5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290
 *
 *	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
5291 5292 5293 5294 5295
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5296
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324
	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
5325
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5326
 */
5327
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5328 5329 5330
{
	struct ata_port *ap = qc->ap;

5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344
	/* 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;
	}

5345
	qc->flags |= ATA_QCFLAG_ACTIVE;
5346
	ap->qc_active |= 1 << qc->tag;
5347

L
Linus Torvalds 已提交
5348 5349 5350
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5351
				goto sg_err;
L
Linus Torvalds 已提交
5352 5353
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5354
				goto sg_err;
L
Linus Torvalds 已提交
5355 5356 5357 5358 5359 5360 5361
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5362 5363 5364 5365
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5366

5367 5368
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5369 5370 5371
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382
}

/**
 *	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
5383 5384
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5385
 *	LOCKING:
J
Jeff Garzik 已提交
5386
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5387 5388
 *
 *	RETURNS:
5389
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5390 5391
 */

5392
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5393 5394 5395
{
	struct ata_port *ap = qc->ap;

5396 5397 5398 5399 5400 5401
	/* 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:
5402
		case ATA_PROT_NODATA:
5403 5404 5405 5406 5407 5408
		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)
5409
				/* see ata_dma_blacklisted() */
5410 5411 5412 5413 5414 5415 5416
				BUG();
			break;
		default:
			break;
		}
	}

5417 5418 5419 5420 5421 5422 5423 5424
	/* 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;

5425
	/* select the device */
L
Linus Torvalds 已提交
5426 5427
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5428
	/* start the command */
L
Linus Torvalds 已提交
5429 5430
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5431 5432 5433
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5434
		ata_tf_to_host(ap, &qc->tf);
5435 5436 5437
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5438
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5439

L
Linus Torvalds 已提交
5440 5441 5442
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5443
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5444

L
Linus Torvalds 已提交
5445 5446 5447
		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 */
5448
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5449 5450
		break;

5451 5452 5453
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5454

J
Jeff Garzik 已提交
5455
		ata_tf_to_host(ap, &qc->tf);
5456

5457 5458 5459
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5460
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5461 5462

			/* always send first data block using
5463
			 * the ata_pio_task() codepath.
5464
			 */
5465
		} else {
5466 5467 5468 5469
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5470
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5471 5472 5473 5474

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5475 5476
		}

L
Linus Torvalds 已提交
5477 5478 5479 5480
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5481 5482 5483
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5484
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5485

5486 5487 5488 5489 5490
		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))
5491
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5492 5493 5494
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5495
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5496

L
Linus Torvalds 已提交
5497 5498
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5499 5500 5501 5502
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5503
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5504 5505 5506 5507
		break;

	default:
		WARN_ON(1);
5508
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523
	}

	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
5524
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5525 5526 5527 5528 5529 5530 5531 5532
 *
 *	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)
{
5533
	struct ata_eh_info *ehi = &ap->eh_info;
5534
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5535

5536
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5537
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5538

5539 5540 5541
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5542 5543 5544
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5545

5546 5547 5548 5549 5550
		/* 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
5551 5552
			goto idle_irq;
		break;
5553 5554 5555 5556 5557
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
5558 5559
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5560 5561 5562 5563 5564 5565 5566

			/* 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);
5567 5568 5569 5570 5571 5572

			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;
			}
5573 5574 5575 5576
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5577 5578 5579 5580
	default:
		goto idle_irq;
	}

5581 5582 5583 5584
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5585

5586 5587 5588 5589
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5590

5591 5592
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5593

5594
	ata_hsm_move(ap, qc, status, 0);
5595 5596 5597 5598 5599

	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
5600 5601 5602 5603 5604 5605 5606
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5607
		ap->ops->irq_ack(ap, 0); /* debug trap */
5608
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5609
		return 1;
L
Linus Torvalds 已提交
5610 5611 5612 5613 5614 5615 5616
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5617
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5618
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5619
 *
J
Jeff Garzik 已提交
5620 5621 5622
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5623
 *	LOCKING:
J
Jeff Garzik 已提交
5624
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5625 5626
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5627
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5628 5629
 */

5630
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5631
{
J
Jeff Garzik 已提交
5632
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5633 5634 5635 5636 5637
	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
5638
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5639

J
Jeff Garzik 已提交
5640
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5641 5642
		struct ata_port *ap;

J
Jeff Garzik 已提交
5643
		ap = host->ports[i];
5644
		if (ap &&
J
Jeff Garzik 已提交
5645
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5646 5647 5648
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5649
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5650
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5651 5652 5653 5654
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5655
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5656 5657 5658 5659

	return IRQ_RETVAL(handled);
}

5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796
/**
 *	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
5797

5798
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5799
{
5800
	unsigned int err_mask;
J
Jens Axboe 已提交
5801 5802 5803 5804 5805
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5806
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5807 5808 5809 5810
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5811 5812 5813 5814 5815 5816 5817
	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
5818 5819
}

5820
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5821 5822 5823
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5824 5825 5826 5827
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5828 5829
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868

		/* 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
5869 5870
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5871 5872
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5873
 *	Suspend @host.  Actual operation is performed by EH.  This
5874 5875 5876 5877 5878 5879 5880 5881 5882
 *	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
5883
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5884
{
5885
	int rc;
5886

J
Jeff Garzik 已提交
5887
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5888 5889
	if (rc == 0)
		host->dev->power.power_state = mesg;
5890 5891 5892 5893
	return rc;
}

/**
J
Jeff Garzik 已提交
5894 5895
 *	ata_host_resume - resume host
 *	@host: host to resume
5896
 *
J
Jeff Garzik 已提交
5897
 *	Resume @host.  Actual operation is performed by EH.  This
5898 5899 5900 5901 5902 5903
 *	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
5904
void ata_host_resume(struct ata_host *host)
5905
{
J
Jeff Garzik 已提交
5906 5907 5908
	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;
5909
}
5910
#endif
5911

5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923
/**
 *	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.
 */
5924
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5925
{
5926
	struct device *dev = ap->dev;
5927
	int rc;
L
Linus Torvalds 已提交
5928

5929 5930
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5931 5932 5933
	if (!ap->prd)
		return -ENOMEM;

5934
	rc = ata_pad_alloc(ap, dev);
5935
	if (rc)
5936
		return rc;
L
Linus Torvalds 已提交
5937

5938 5939
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5940 5941 5942
	return 0;
}

5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954
/**
 *	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;
5955 5956
	unsigned long flags;

5957 5958 5959
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5960 5961
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5962
	 * host lock.
5963
	 */
5964
	spin_lock_irqsave(ap->lock, flags);
5965
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5966
	spin_unlock_irqrestore(ap->lock, flags);
5967

5968 5969
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5970 5971 5972 5973 5974
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5975
/**
5976 5977
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5978
 *
5979 5980 5981 5982
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5983
 *
L
Linus Torvalds 已提交
5984
 *	LOCKING:
5985
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5986
 */
5987
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5988
{
5989
	struct ata_port *ap;
L
Linus Torvalds 已提交
5990 5991
	unsigned int i;

5992 5993 5994 5995 5996 5997
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;

5998
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
5999
	ap->lock = &host->lock;
6000
	ap->flags = ATA_FLAG_DISABLED;
6001
	ap->print_id = -1;
L
Linus Torvalds 已提交
6002
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6003
	ap->host = host;
6004 6005
	ap->dev = host->dev;

6006
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
6007 6008
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
6009 6010 6011 6012 6013 6014

#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
6015
#else
6016
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6017
#endif
L
Linus Torvalds 已提交
6018

6019 6020 6021
	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);
6022
	INIT_LIST_HEAD(&ap->eh_done_q);
6023
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
6024

6025 6026
	ap->cbl = ATA_CBL_NONE;

6027 6028
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
6029
		dev->ap = ap;
6030
		dev->devno = i;
6031
		ata_dev_init(dev);
6032
	}
L
Linus Torvalds 已提交
6033 6034 6035 6036 6037 6038 6039 6040

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

6041 6042 6043 6044 6045 6046 6047 6048
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];

6049 6050 6051 6052
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6053 6054 6055
			ap->ops->port_stop(ap);
	}

6056
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6057
		host->ops->host_stop(host);
6058

6059 6060 6061
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6062 6063 6064 6065
		if (!ap)
			continue;

		if (ap->scsi_host)
6066 6067
			scsi_host_put(ap->scsi_host);

6068
		kfree(ap);
6069 6070 6071
		host->ports[i] = NULL;
	}

6072
	dev_set_drvdata(gendev, NULL);
6073 6074
}

6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 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 6136 6137 6138 6139
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return NULL;

	/* alloc a container for our list of ATA ports (buses) */
	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
	/* alloc a container for our list of ATA ports (buses) */
	host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
	if (!host)
		goto err_out;

	devres_add(dev, host);
	dev_set_drvdata(dev, host);

	spin_lock_init(&host->lock);
	host->dev = dev;
	host->n_ports = max_ports;

	/* allocate ports bound to this host */
	for (i = 0; i < max_ports; i++) {
		struct ata_port *ap;

		ap = ata_port_alloc(host);
		if (!ap)
			goto err_out;

		ap->port_no = i;
		host->ports[i] = ap;
	}

	devres_remove_group(dev, NULL);
	return host;

 err_out:
	devres_release_group(dev, NULL);
	return NULL;
}

6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

	host = ata_host_alloc(dev, n_ports);
	if (!host)
		return NULL;

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

		if (ppi[j])
			pi = ppi[j++];

		ap->pio_mask = pi->pio_mask;
		ap->mwdma_mask = pi->mwdma_mask;
		ap->udma_mask = pi->udma_mask;
		ap->flags |= pi->flags;
		ap->ops = pi->port_ops;

		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
			host->ops = pi->port_ops;
		if (!host->private_data && pi->private_data)
			host->private_data = pi->private_data;
	}

	return host;
}

6189 6190 6191 6192 6193 6194 6195
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
6196 6197
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
	int i, rc;

	if (host->flags & ATA_HOST_STARTED)
		return 0;

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

6215 6216 6217
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
				ata_port_printk(ap, KERN_ERR, "failed to "
						"start port (errno=%d)\n", rc);
				goto err_out;
			}
		}

		ata_eh_freeze_port(ap);
	}

	host->flags |= ATA_HOST_STARTED;
	return 0;

 err_out:
	while (--i >= 0) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}
	return rc;
}

6243
/**
J
Jeff Garzik 已提交
6244 6245 6246 6247 6248
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6249 6250 6251 6252 6253
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6254
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6255 6256
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6257
{
J
Jeff Garzik 已提交
6258 6259 6260 6261
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6262 6263
}

6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
		dev_printk(KERN_ERR, host->dev,
			   "BUG: trying to register unstarted host\n");
		WARN_ON(1);
		return -EINVAL;
	}

	/* Blow away unused ports.  This happens when LLD can't
	 * determine the exact number of ports to allocate at
	 * allocation time.
	 */
	for (i = host->n_ports; host->ports[i]; i++)
		kfree(host->ports[i]);

	/* give ports names and add SCSI hosts */
	for (i = 0; i < host->n_ports; i++)
		host->ports[i]->print_id = ata_print_id++;

	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
		return rc;

	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int irq_line;
		u32 scontrol;
		unsigned long xfer_mask;

		/* set SATA cable type if still unset */
		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
			ap->cbl = ATA_CBL_SATA;

		/* 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;

		/* report the secondary IRQ for second channel legacy */
		irq_line = host->irq;
		if (i == 1 && host->irq2)
			irq_line = host->irq2;

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

		/* print per-port info to dmesg */
		if (!ata_port_is_dummy(ap))
			ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
					"ctl 0x%p bmdma 0x%p irq %d\n",
					ap->cbl == ATA_CBL_SATA ? 'S' : 'P',
					ata_mode_string(xfer_mask),
					ap->ioaddr.cmd_addr,
					ap->ioaddr.ctl_addr,
					ap->ioaddr.bmdma_addr,
					irq_line);
		else
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int rc;

		/* probe */
		if (ap->ops->error_handler) {
			struct ata_eh_info *ehi = &ap->eh_info;
			unsigned long flags;

			ata_port_probe(ap);

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

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

6367
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401
			ap->pflags |= ATA_PFLAG_LOADING;
			ata_port_schedule_eh(ap);

			spin_unlock_irqrestore(ap->lock, flags);

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

	/* probes are done, now scan each port's disk(s) */
	DPRINTK("host probe begin\n");
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		ata_scsi_scan_host(ap);
	}

	return 0;
}

6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
	int rc;

	rc = ata_host_start(host);
	if (rc)
		return rc;

	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

	rc = ata_host_register(host, sht);
	/* if failed, just free the IRQ and leave ports alone */
	if (rc)
		devm_free_irq(host->dev, irq, host);

	return rc;
}

6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460
/**
 *	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)
6461
		goto skip_eh;
6462 6463

	/* tell EH we're leaving & flush EH */
6464
	spin_lock_irqsave(ap->lock, flags);
6465
	ap->pflags |= ATA_PFLAG_UNLOADING;
6466
	spin_unlock_irqrestore(ap->lock, flags);
6467 6468 6469 6470 6471 6472

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6473
	spin_lock_irqsave(ap->lock, flags);
6474 6475 6476 6477

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

6478
	spin_unlock_irqrestore(ap->lock, flags);
6479 6480 6481 6482 6483

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6484
	spin_lock_irqsave(ap->lock, flags);
6485
	ata_port_freeze(ap);	/* won't be thawed */
6486
	spin_unlock_irqrestore(ap->lock, flags);
6487 6488 6489 6490 6491 6492

	ata_port_wait_eh(ap);

	/* Flush hotplug task.  The sequence is similar to
	 * ata_port_flush_task().
	 */
6493
	cancel_work_sync(&ap->hotplug_task.work); /* akpm: why? */
6494
	cancel_delayed_work(&ap->hotplug_task);
6495
	cancel_work_sync(&ap->hotplug_task.work);
6496

6497
 skip_eh:
6498
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6499
	scsi_remove_host(ap->scsi_host);
6500 6501
}

T
Tejun Heo 已提交
6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518
/**
 *	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]);
}

L
Linus Torvalds 已提交
6519 6520 6521
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6522 6523 6524 6525 6526 6527 6528
 *
 *	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
6529
 */
E
Edward Falk 已提交
6530

L
Linus Torvalds 已提交
6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544
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
6545

6546 6547
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6548 6549 6550 6551
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6552 6553 6554
 *	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
6555 6556 6557 6558
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6559
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6560 6561
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6562
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6563

T
Tejun Heo 已提交
6564
	ata_host_detach(host);
L
Linus Torvalds 已提交
6565 6566 6567
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6568
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599
{
	unsigned long tmp = 0;

	switch (bits->width) {
	case 1: {
		u8 tmp8 = 0;
		pci_read_config_byte(pdev, bits->reg, &tmp8);
		tmp = tmp8;
		break;
	}
	case 2: {
		u16 tmp16 = 0;
		pci_read_config_word(pdev, bits->reg, &tmp16);
		tmp = tmp16;
		break;
	}
	case 4: {
		u32 tmp32 = 0;
		pci_read_config_dword(pdev, bits->reg, &tmp32);
		tmp = tmp32;
		break;
	}

	default:
		return -EINVAL;
	}

	tmp &= bits->mask;

	return (tmp == bits->val) ? 1 : 0;
}
J
Jens Axboe 已提交
6600

6601
#ifdef CONFIG_PM
6602
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6603 6604
{
	pci_save_state(pdev);
6605
	pci_disable_device(pdev);
6606

6607
	if (mesg.event == PM_EVENT_SUSPEND)
6608
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6609 6610
}

6611
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6612
{
6613 6614
	int rc;

J
Jens Axboe 已提交
6615 6616
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6617

T
Tejun Heo 已提交
6618
	rc = pcim_enable_device(pdev);
6619 6620 6621 6622 6623 6624
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
6625
	pci_set_master(pdev);
6626
	return 0;
6627 6628
}

6629
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6630
{
J
Jeff Garzik 已提交
6631
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6632 6633
	int rc = 0;

J
Jeff Garzik 已提交
6634
	rc = ata_host_suspend(host, mesg);
6635 6636 6637
	if (rc)
		return rc;

6638
	ata_pci_device_do_suspend(pdev, mesg);
6639 6640 6641 6642 6643 6644

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6645
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6646
	int rc;
6647

6648 6649 6650 6651
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6652
}
6653 6654
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6655 6656 6657 6658 6659
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6660
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6661 6662 6663 6664
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6665 6666 6667 6668 6669 6670
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6671 6672 6673 6674 6675 6676 6677
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6678
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6679 6680
}

6681
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6682 6683
module_exit(ata_exit);

6684
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6685
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704

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;
}

6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

	/* Calculate timeout _after_ the first read to make sure
	 * preceding writes reach the controller before starting to
	 * eat away the timeout.
	 */
	timeout = jiffies + (timeout_msec * HZ) / 1000;

	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
		msleep(interval_msec);
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783
/*
 * 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,
};

6784 6785 6786 6787
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6788 6789 6790 6791 6792 6793 6794
/*
 * 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.
 */

6795 6796 6797
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
T
Tejun Heo 已提交
6798
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6799
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
6800 6801
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6802
EXPORT_SYMBOL_GPL(ata_host_init);
6803
EXPORT_SYMBOL_GPL(ata_host_alloc);
6804
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6805
EXPORT_SYMBOL_GPL(ata_host_start);
6806
EXPORT_SYMBOL_GPL(ata_host_register);
6807
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6808
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6809 6810
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6811
EXPORT_SYMBOL_GPL(ata_hsm_move);
6812
EXPORT_SYMBOL_GPL(ata_qc_complete);
6813
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6814 6815 6816 6817 6818
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);
6819
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6820 6821 6822 6823 6824 6825 6826
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);
6827
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
6828 6829
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6830
EXPORT_SYMBOL_GPL(ata_qc_prep);
6831
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6832 6833 6834 6835 6836
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);
6837 6838 6839 6840 6841
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
6842
EXPORT_SYMBOL_GPL(ata_port_probe);
6843
EXPORT_SYMBOL_GPL(ata_dev_disable);
6844
EXPORT_SYMBOL_GPL(sata_set_spd);
6845 6846
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6847 6848 6849
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6850
EXPORT_SYMBOL_GPL(ata_std_prereset);
6851
EXPORT_SYMBOL_GPL(ata_std_softreset);
6852
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6853 6854
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6855 6856
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6857
EXPORT_SYMBOL_GPL(ata_port_disable);
6858
EXPORT_SYMBOL_GPL(ata_ratelimit);
6859
EXPORT_SYMBOL_GPL(ata_wait_register);
6860
EXPORT_SYMBOL_GPL(ata_busy_sleep);
6861
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
6862
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6863 6864 6865
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6866
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6867
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6868
EXPORT_SYMBOL_GPL(ata_host_intr);
6869 6870 6871 6872 6873 6874
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);
6875
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6876 6877
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6878
#endif /* CONFIG_PM */
6879 6880
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6881
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6882
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6883 6884
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6885
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6886 6887 6888
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6889 6890
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6891
EXPORT_SYMBOL_GPL(ata_pci_init_native_host);
T
Tejun Heo 已提交
6892
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
6893
EXPORT_SYMBOL_GPL(ata_pci_prepare_native_host);
L
Linus Torvalds 已提交
6894 6895
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6896
#ifdef CONFIG_PM
6897 6898
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6899 6900
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6901
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6902 6903
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6904
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6905

6906
EXPORT_SYMBOL_GPL(ata_eng_timeout);
6907 6908
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6909 6910 6911
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6912 6913
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6914
EXPORT_SYMBOL_GPL(ata_do_eh);
6915 6916 6917 6918
EXPORT_SYMBOL_GPL(ata_irq_on);
EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
EXPORT_SYMBOL_GPL(ata_irq_ack);
EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
A
Akira Iguchi 已提交
6919
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6920 6921 6922 6923 6924

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