libata-core.c 153.4 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

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

#include "libata.h"

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


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

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
693
 *	@r_err: Value of error register on completion
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
706 707 708
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

711 712
static unsigned int
ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
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{
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

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

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

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

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

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

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

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

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

		ofs++;
		len -= 2;
	}
}

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

	WARN_ON(!(len & 1));

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

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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

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

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

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

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

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

void ata_dev_select(struct ata_port *ap, unsigned int device,
			   unsigned int wait, unsigned int can_sleep)
{
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	if (ata_msg_probe(ap))
894
		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, ata%u: "
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				"device %u, wait %u\n", ap->id, device, wait);
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	if (wait)
		ata_wait_idle(ap);

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
911
 *	@id: IDENTIFY DEVICE page to dump
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 *
913 914
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

920
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",
927 928 929 930 931
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
937 938 939 940 941
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
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	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
944 945
		id[88],
		id[93]);
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}

948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976
/**
 *	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.
		 */
977
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
978 979 980 981
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
982 983 984 985 986 987 988 989 990 991

		/* 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;
992

993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
	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);
	}

1010 1011 1012
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1013 1014 1015 1016

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1020
 *	@fn: workqueue function to be scheduled
1021
 *	@data: data for @fn to use
1022
 *	@delay: delay time for workqueue function
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 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
 *	port_task and EH.  ata_port_queue_task() may be ignored for EH
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
1036
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
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			 unsigned long delay)
{
	int rc;

1041
	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
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		return;

1044 1045
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
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1047
	rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
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	/* rc == 0 means that another user is using port task */
	WARN_ON(rc == 0);
}

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

	DPRINTK("ENTER\n");

1069
	spin_lock_irqsave(ap->lock, flags);
1070
	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
1071
	spin_unlock_irqrestore(ap->lock, flags);
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	DPRINTK("flush #1\n");
	flush_workqueue(ata_wq);

	/*
	 * At this point, if a task is running, it's guaranteed to see
	 * the FLUSH flag; thus, it will never queue pio tasks again.
	 * Cancel and flush.
	 */
	if (!cancel_delayed_work(&ap->port_task)) {
1082
		if (ata_msg_ctl(ap))
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			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
					__FUNCTION__);
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		flush_workqueue(ata_wq);
	}

1088
	spin_lock_irqsave(ap->lock, flags);
1089
	ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
1090
	spin_unlock_irqrestore(ap->lock, flags);
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1092 1093
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
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}

1096
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1097
{
1098
	struct completion *waiting = qc->private_data;
1099 1100 1101 1102 1103

	complete(waiting);
}

/**
1104
 *	ata_exec_internal_sg - execute libata internal command
1105 1106
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1107
 *	@cdb: CDB for packet command
1108
 *	@dma_dir: Data tranfer direction of the command
1109 1110
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1111 1112 1113 1114 1115 1116 1117 1118 1119
 *
 *	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.
1120 1121 1122
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1123
 */
1124 1125 1126 1127
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)
1128
{
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	struct ata_port *ap = dev->ap;
1130 1131
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1132
	unsigned int tag, preempted_tag;
1133
	u32 preempted_sactive, preempted_qc_active;
1134
	DECLARE_COMPLETION_ONSTACK(wait);
1135
	unsigned long flags;
1136
	unsigned int err_mask;
1137
	int rc;
1138

1139
	spin_lock_irqsave(ap->lock, flags);
1140

1141
	/* no internal command while frozen */
1142
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1143
		spin_unlock_irqrestore(ap->lock, flags);
1144 1145 1146
		return AC_ERR_SYSTEM;
	}

1147
	/* initialize internal qc */
1148

1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
	/* 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;

1159
	if (test_and_set_bit(tag, &ap->qc_allocated))
1160
		BUG();
1161
	qc = __ata_qc_from_tag(ap, tag);
1162 1163 1164 1165 1166 1167 1168 1169

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

	preempted_tag = ap->active_tag;
1170 1171
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1172
	ap->active_tag = ATA_TAG_POISON;
1173 1174
	ap->sactive = 0;
	ap->qc_active = 0;
1175 1176

	/* prepare & issue qc */
1177
	qc->tf = *tf;
1178 1179
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1180
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1181 1182
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1183 1184 1185 1186 1187 1188
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1189
		qc->nbytes = buflen;
1190 1191
	}

1192
	qc->private_data = &wait;
1193 1194
	qc->complete_fn = ata_qc_complete_internal;

1195
	ata_qc_issue(qc);
1196

1197
	spin_unlock_irqrestore(ap->lock, flags);
1198

A
Andrew Morton 已提交
1199
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1200 1201

	ata_port_flush_task(ap);
1202

1203
	if (!rc) {
1204
		spin_lock_irqsave(ap->lock, flags);
1205 1206 1207

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1208 1209
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1210
		 */
1211
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1212 1213 1214 1215 1216 1217
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1218

1219 1220
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1221
					"qc timeout (cmd 0x%x)\n", command);
1222 1223
		}

1224
		spin_unlock_irqrestore(ap->lock, flags);
1225 1226
	}

1227 1228 1229 1230
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

A
Alan 已提交
1231
	if ((qc->flags & ATA_QCFLAG_FAILED) && !qc->err_mask) {
1232
		if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1233
			ata_dev_printk(dev, KERN_WARNING,
1234
				"zero err_mask for failed "
T
Tejun Heo 已提交
1235
				"internal command, assuming AC_ERR_OTHER\n");
1236 1237 1238
		qc->err_mask |= AC_ERR_OTHER;
	}

1239
	/* finish up */
1240
	spin_lock_irqsave(ap->lock, flags);
1241

1242
	*tf = qc->result_tf;
1243 1244 1245
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1246
	ap->active_tag = preempted_tag;
1247 1248
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1249

1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
	/* 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.
	 */
1261
	if (ap->flags & ATA_FLAG_DISABLED) {
1262 1263 1264 1265
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

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

1268
	return err_mask;
1269 1270
}

1271
/**
1272
 *	ata_exec_internal - execute libata internal command
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
 *	@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)
{
1293 1294
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1295

1296 1297 1298 1299 1300 1301
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1302

1303
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1304 1305
}

1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
/**
 *	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
1319
 */
1320
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1321 1322 1323 1324 1325 1326 1327 1328 1329
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1330
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1331 1332
}

1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */

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

	if (speed < 2)
		return 0;
	if (speed > 2)
		return 1;
1350

1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
	/* If we have no drive specific rule, then PIO 2 is non IORDY */

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

L
Linus Torvalds 已提交
1366
/**
1367 1368 1369
 *	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)
1370
 *	@flags: ATA_READID_* flags
1371
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1372
 *
1373 1374
 *	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
1375 1376
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1377 1378
 *
 *	LOCKING:
1379 1380 1381 1382
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1383
 */
1384
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1385
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1386
{
T
Tejun Heo 已提交
1387
	struct ata_port *ap = dev->ap;
1388
	unsigned int class = *p_class;
1389
	struct ata_taskfile tf;
1390 1391 1392
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1393

1394
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1395 1396
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1397

1398
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1399

1400
 retry:
T
Tejun Heo 已提交
1401
	ata_tf_init(dev, &tf);
1402

1403 1404
	switch (class) {
	case ATA_DEV_ATA:
1405
		tf.command = ATA_CMD_ID_ATA;
1406 1407
		break;
	case ATA_DEV_ATAPI:
1408
		tf.command = ATA_CMD_ID_ATAPI;
1409 1410 1411 1412 1413
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1414 1415
	}

1416
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1417 1418 1419 1420 1421 1422 1423 1424 1425 1426

	/* 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
1427

T
Tejun Heo 已提交
1428
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1429
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1430
	if (err_mask) {
1431
		if (err_mask & AC_ERR_NODEV_HINT) {
1432 1433 1434 1435 1436
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
				ap->id, dev->devno);
			return -ENOENT;
		}

1437 1438
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1439 1440 1441
		goto err_out;
	}

1442
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1443

1444
	/* sanity check */
1445 1446 1447 1448 1449 1450 1451 1452 1453
	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;
1454 1455
	}

1456
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1457 1458 1459 1460 1461 1462 1463 1464 1465
		/*
		 * 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
1466
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1467 1468 1469 1470 1471 1472 1473 1474 1475
			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.
			 */
1476
			flags &= ~ATA_READID_POSTRESET;
1477 1478 1479 1480 1481
			goto retry;
		}
	}

	*p_class = class;
1482

1483 1484 1485
	return 0;

 err_out:
T
Tejun Heo 已提交
1486
	if (ata_msg_warn(ap))
1487
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1488
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1489 1490 1491
	return rc;
}

T
Tejun Heo 已提交
1492
static inline u8 ata_dev_knobble(struct ata_device *dev)
1493
{
T
Tejun Heo 已提交
1494
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1495 1496
}

1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
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;
	}
1507 1508 1509 1510
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1511
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1512
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1513 1514 1515 1516 1517 1518 1519 1520 1521
		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);
}

1522 1523 1524 1525
static void ata_set_port_max_cmd_len(struct ata_port *ap)
{
	int i;

J
Jeff Garzik 已提交
1526 1527 1528
	if (ap->scsi_host) {
		unsigned int len = 0;

1529
		for (i = 0; i < ATA_MAX_DEVICES; i++)
J
Jeff Garzik 已提交
1530 1531 1532
			len = max(len, ap->device[i].cdb_len);

		ap->scsi_host->max_cmd_len = len;
1533 1534 1535
	}
}

1536
/**
1537 1538 1539 1540 1541
 *	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.
1542 1543
 *
 *	LOCKING:
1544 1545 1546 1547
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1548
 */
1549
int ata_dev_configure(struct ata_device *dev)
1550
{
T
Tejun Heo 已提交
1551
	struct ata_port *ap = dev->ap;
1552
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1553
	const u16 *id = dev->id;
1554
	unsigned int xfer_mask;
1555
	char revbuf[7];		/* XYZ-99\0 */
1556 1557
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1558
	int rc;
1559

1560
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1561 1562 1563
		ata_dev_printk(dev, KERN_INFO,
			       "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
			       __FUNCTION__, ap->id, dev->devno);
1564
		return 0;
1565 1566
	}

1567
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1568 1569
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1570

1571
	/* print device capabilities */
1572
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1573 1574 1575
		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",
1576
			       __FUNCTION__,
1577 1578
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1579

1580
	/* initialize to-be-configured parameters */
1581
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1582 1583 1584 1585 1586 1587 1588
	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
1589 1590 1591 1592
	/*
	 * common ATA, ATAPI feature tests
	 */

1593
	/* find max transfer mode; for printk only */
1594
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1595

1596 1597
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1598 1599 1600

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1601 1602 1603 1604 1605 1606 1607 1608 1609
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
				ata_dev_printk(dev, KERN_WARNING, "ata%u: device %u  supports DRM functions and may not be fully accessable.\n",
					ap->id, dev->devno);
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1610
		dev->n_sectors = ata_id_n_sectors(id);
1611

1612
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1613
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1614 1615
				sizeof(fwrevbuf));

1616
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1617 1618 1619 1620 1621
				sizeof(modelbuf));

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

1622
		if (ata_id_has_lba(id)) {
1623
			const char *lba_desc;
1624
			char ncq_desc[20];
1625

1626 1627
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1628
			if (ata_id_has_lba48(id)) {
1629
				dev->flags |= ATA_DFLAG_LBA48;
1630
				lba_desc = "LBA48";
1631 1632 1633 1634

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1635
			}
1636

1637 1638 1639
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1640
			/* print device info to dmesg */
1641 1642 1643 1644 1645 1646 1647
			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",
1648
					(unsigned long long)dev->n_sectors,
1649 1650
					dev->multi_count, lba_desc, ncq_desc);
			}
1651
		} else {
1652 1653 1654
			/* CHS */

			/* Default translation */
1655 1656 1657
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1658

1659
			if (ata_id_current_chs_valid(id)) {
1660
				/* Current CHS translation is valid. */
1661 1662 1663
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1664 1665 1666
			}

			/* print device info to dmesg */
1667
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1668
				ata_dev_printk(dev, KERN_INFO,
1669 1670 1671 1672 1673 1674 1675 1676 1677
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO, 
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1678 1679
		}

1680
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1681 1682 1683
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1684
	else if (dev->class == ATA_DEV_ATAPI) {
1685 1686
		char *cdb_intr_string = "";

1687
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1688
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1689
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1690 1691
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1692
			rc = -EINVAL;
L
Linus Torvalds 已提交
1693 1694
			goto err_out_nosup;
		}
1695
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1696

1697
		if (ata_id_cdb_intr(dev->id)) {
1698
			dev->flags |= ATA_DFLAG_CDB_INTR;
1699 1700
			cdb_intr_string = ", CDB intr";
		}
1701

L
Linus Torvalds 已提交
1702
		/* print device info to dmesg */
1703
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1704 1705 1706
			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
1707 1708
	}

1709 1710 1711 1712 1713
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
	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");
		}
	}

1726
	ata_set_port_max_cmd_len(ap);
1727

1728
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1729
	if (ata_dev_knobble(dev)) {
1730
		if (ata_msg_drv(ap) && print_info)
1731 1732
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1733
		dev->udma_mask &= ATA_UDMA5;
1734 1735 1736 1737 1738 1739
		dev->max_sectors = ATA_MAX_SECTORS;
	}

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

1740 1741 1742 1743 1744 1745 1746 1747
	/* set _SDD */
	rc = ata_acpi_push_id(ap, dev->devno);
	if (rc) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set _SDD(%d)\n",
			rc);
		goto err_out_nosup;
	}

1748 1749 1750
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1751
	return 0;
L
Linus Torvalds 已提交
1752 1753

err_out_nosup:
1754
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1755 1756
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1757
	return rc;
L
Linus Torvalds 已提交
1758 1759 1760 1761 1762 1763
}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1764 1765 1766 1767
 *	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
1768
 *	LOCKING:
J
Jeff Garzik 已提交
1769
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1770 1771
 *
 *	RETURNS:
1772
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1773 1774
 */

1775
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1776
{
1777
	unsigned int classes[ATA_MAX_DEVICES];
1778 1779
	int tries[ATA_MAX_DEVICES];
	int i, rc, down_xfermask;
1780
	struct ata_device *dev;
L
Linus Torvalds 已提交
1781

1782
	ata_port_probe(ap);
1783

1784 1785 1786 1787 1788 1789
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
	down_xfermask = 0;

1790
	/* reset and determine device classes */
1791
	ap->ops->phy_reset(ap);
1792

1793 1794 1795
	/* retrieve and execute the ATA task file of _GTF */
	ata_acpi_exec_tfs(ap);

1796 1797
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1798

1799 1800 1801 1802 1803
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1804

1805
		dev->class = ATA_DEV_UNKNOWN;
1806
	}
L
Linus Torvalds 已提交
1807

1808
	ata_port_probe(ap);
1809

A
Alan Cox 已提交
1810 1811 1812 1813 1814 1815
	/* 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;

1816
	/* read IDENTIFY page and configure devices */
L
Linus Torvalds 已提交
1817
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1818
		dev = &ap->device[i];
1819

1820 1821
		if (tries[i])
			dev->class = classes[i];
1822

1823
		if (!ata_dev_enabled(dev))
1824 1825
			continue;

1826 1827
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1828 1829 1830
		if (rc)
			goto fail;

1831 1832 1833
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1834 1835
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1836 1837
	}

1838
	/* configure transfer mode */
1839
	rc = ata_set_mode(ap, &dev);
1840 1841 1842
	if (rc) {
		down_xfermask = 1;
		goto fail;
1843
	}
L
Linus Torvalds 已提交
1844

1845 1846 1847
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1848

1849 1850
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1851
	ap->ops->port_disable(ap);
1852
	return -ENODEV;
1853 1854 1855 1856 1857 1858 1859 1860

 fail:
	switch (rc) {
	case -EINVAL:
	case -ENODEV:
		tries[dev->devno] = 0;
		break;
	case -EIO:
1861
		sata_down_spd_limit(ap);
1862 1863 1864 1865
		/* fall through */
	default:
		tries[dev->devno]--;
		if (down_xfermask &&
T
Tejun Heo 已提交
1866
		    ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1867 1868 1869
			tries[dev->devno] = 0;
	}

1870
	if (!tries[dev->devno]) {
T
Tejun Heo 已提交
1871 1872
		ata_down_xfermask_limit(dev, 1);
		ata_dev_disable(dev);
1873 1874
	}

1875
	goto retry;
L
Linus Torvalds 已提交
1876 1877 1878
}

/**
J
Jeff Garzik 已提交
1879 1880
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1881
 *
J
Jeff Garzik 已提交
1882 1883 1884
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1885
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1886
 *	serialization.
L
Linus Torvalds 已提交
1887 1888 1889 1890
 */

void ata_port_probe(struct ata_port *ap)
{
1891
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1892 1893
}

1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
/**
 *	sata_print_link_status - Print SATA link status
 *	@ap: SATA port to printk link status about
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
static void sata_print_link_status(struct ata_port *ap)
{
1905
	u32 sstatus, scontrol, tmp;
1906

1907
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1908
		return;
1909
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1910

1911
	if (ata_port_online(ap)) {
1912
		tmp = (sstatus >> 4) & 0xf;
1913 1914 1915
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1916
	} else {
1917 1918 1919
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1920 1921 1922
	}
}

L
Linus Torvalds 已提交
1923
/**
J
Jeff Garzik 已提交
1924 1925
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1926
 *
J
Jeff Garzik 已提交
1927 1928 1929
 *	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
1930 1931
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1932
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1933 1934 1935 1936 1937 1938 1939 1940
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1941
		/* issue phy wake/reset */
1942
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1943 1944 1945
		/* 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
1946
	}
1947 1948
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1949 1950 1951 1952

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1953
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1954 1955 1956 1957
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1958 1959
	/* print link status */
	sata_print_link_status(ap);
1960

1961
	/* TODO: phy layer with polling, timeouts, etc. */
1962
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
1963
		ata_port_probe(ap);
1964
	else
L
Linus Torvalds 已提交
1965 1966
		ata_port_disable(ap);

1967
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
		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
1979 1980
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1981
 *
J
Jeff Garzik 已提交
1982 1983
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
1984 1985
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1986
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1987 1988 1989 1990 1991
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
1992
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
1993 1994 1995 1996
		return;
	ata_bus_reset(ap);
}

1997 1998 1999 2000 2001 2002 2003
/**
 *	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
 */
2004

T
Tejun Heo 已提交
2005
struct ata_device *ata_dev_pair(struct ata_device *adev)
2006
{
T
Tejun Heo 已提交
2007
	struct ata_port *ap = adev->ap;
2008
	struct ata_device *pair = &ap->device[1 - adev->devno];
2009
	if (!ata_dev_enabled(pair))
2010 2011 2012 2013
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2014
/**
J
Jeff Garzik 已提交
2015 2016
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2017
 *
J
Jeff Garzik 已提交
2018 2019 2020 2021 2022
 *	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
2023
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2024
 *	serialization.
L
Linus Torvalds 已提交
2025 2026 2027 2028 2029 2030
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2031
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2032 2033
}

2034
/**
2035
 *	sata_down_spd_limit - adjust SATA spd limit downward
2036 2037 2038 2039
 *	@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
2040
 *	using sata_set_spd().
2041 2042 2043 2044 2045 2046 2047
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2048
int sata_down_spd_limit(struct ata_port *ap)
2049
{
2050 2051
	u32 sstatus, spd, mask;
	int rc, highbit;
2052

2053 2054 2055
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2056 2057 2058 2059 2060 2061 2062

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

2063
	spd = (sstatus >> 4) & 0xf;
2064 2065 2066 2067 2068 2069 2070 2071 2072
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2073 2074
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2075 2076 2077 2078

	return 0;
}

2079
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094
{
	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;
}

/**
2095
 *	sata_set_spd_needed - is SATA spd configuration needed
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
 *	@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.
 */
2109
int sata_set_spd_needed(struct ata_port *ap)
2110 2111 2112
{
	u32 scontrol;

2113
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2114 2115
		return 0;

2116
	return __sata_set_spd_needed(ap, &scontrol);
2117 2118 2119
}

/**
2120
 *	sata_set_spd - set SATA spd according to spd limit
2121 2122 2123 2124 2125 2126 2127 2128 2129
 *	@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
2130
 *	changed.  Negative errno if SCR registers are inaccessible.
2131
 */
2132
int sata_set_spd(struct ata_port *ap)
2133 2134
{
	u32 scontrol;
2135
	int rc;
2136

2137 2138
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2139

2140
	if (!__sata_set_spd_needed(ap, &scontrol))
2141 2142
		return 0;

2143 2144 2145
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2146 2147 2148
	return 1;
}

A
Alan Cox 已提交
2149 2150 2151 2152 2153
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2154
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2155
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2156 2157 2158
 * 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
2159 2160 2161 2162 2163 2164 2165 2166 2167
 */

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 },

2168 2169
	{ 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
2170 2171 2172 2173 2174
	{ 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 }, */
2175

A
Alan Cox 已提交
2176 2177 2178
	{ 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 },
2179

A
Alan Cox 已提交
2180 2181 2182 2183
	{ 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 },

2184 2185
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
A
Alan Cox 已提交
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230
	{ 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
2231
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2232
			return NULL;
2233
	return t;
A
Alan Cox 已提交
2234 2235 2236 2237 2238 2239 2240 2241 2242
}

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;

	/*
2243
	 * Find the mode.
2244
	 */
A
Alan Cox 已提交
2245 2246 2247 2248

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

2249 2250
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
	/*
	 * 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.
	 */

2271
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2272 2273

	/*
2274 2275 2276
	 * 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
2277 2278
	 */

2279
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2280 2281 2282 2283 2284
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2285
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300
	 */

	if (t->act8b + t->rec8b < t->cyc8b) {
		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
		t->rec8b = t->cyc8b - t->act8b;
	}

	if (t->active + t->recover < t->cycle) {
		t->active += (t->cycle - (t->active + t->recover)) / 2;
		t->recover = t->cycle - t->active;
	}

	return 0;
}

2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
 *	@force_pio0: Force PIO0
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
T
Tejun Heo 已提交
2316
int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
{
	unsigned long xfer_mask;
	int highbit;

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

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

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

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

2340 2341
	ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
		       ata_mode_string(xfer_mask));
2342 2343 2344 2345 2346 2347 2348

	return 0;

 fail:
	return -EINVAL;
}

T
Tejun Heo 已提交
2349
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2350
{
2351
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2352 2353
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2354

2355
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2356 2357 2358
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2359
	err_mask = ata_dev_set_xfermode(dev);
2360 2361 2362 2363
	/* 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;

2364
	if (err_mask) {
2365 2366
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2367 2368
		return -EIO;
	}
L
Linus Torvalds 已提交
2369

2370
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2371
	rc = ata_dev_revalidate(dev, 0);
2372
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2373
	if (rc)
2374
		return rc;
2375

2376 2377
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2378

2379 2380
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2381
	return 0;
L
Linus Torvalds 已提交
2382 2383 2384 2385 2386
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2387
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2388
 *
2389 2390 2391
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2392
 *
L
Linus Torvalds 已提交
2393
 *	LOCKING:
J
Jeff Garzik 已提交
2394
 *	PCI/etc. bus probe sem.
2395 2396 2397
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2398
 */
2399
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2400
{
2401
	struct ata_device *dev;
2402
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2403

2404
	/* has private set_mode? */
A
Alan 已提交
2405 2406
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2407

2408 2409
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2410
		unsigned int pio_mask, dma_mask;
2411

2412 2413
		dev = &ap->device[i];

2414
		if (!ata_dev_enabled(dev))
2415 2416
			continue;

T
Tejun Heo 已提交
2417
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2418

2419 2420 2421 2422
		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);
2423

2424
		found = 1;
2425 2426
		if (dev->dma_mode)
			used_dma = 1;
2427
	}
2428
	if (!found)
2429
		goto out;
2430 2431

	/* step 2: always set host PIO timings */
2432 2433 2434 2435 2436 2437
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2438
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2439
			rc = -EINVAL;
2440
			goto out;
2441 2442 2443 2444 2445 2446 2447
		}

		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
2448

2449
	/* step 3: set host DMA timings */
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460
	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
2461 2462

	/* step 4: update devices' xfer mode */
2463
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2464
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2465

A
Alan 已提交
2466
		/* don't update suspended devices' xfer mode */
2467
		if (!ata_dev_ready(dev))
2468 2469
			continue;

T
Tejun Heo 已提交
2470
		rc = ata_dev_set_mode(dev);
2471
		if (rc)
2472
			goto out;
2473
	}
L
Linus Torvalds 已提交
2474

2475 2476
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2477
	 */
J
Jeff Garzik 已提交
2478 2479
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
		ap->host->simplex_claimed = 1;
2480

2481
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2482 2483 2484
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

2485 2486 2487 2488
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2489 2490
}

2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
/**
 *	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
2501
 *	spin_lock_irqsave(host lock)
2502 2503 2504 2505 2506 2507 2508 2509 2510
 */

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
2511 2512 2513 2514 2515 2516
/**
 *	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
2517 2518 2519
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2520 2521 2522 2523 2524
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2525
 */
2526 2527
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2528 2529 2530 2531 2532 2533 2534
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2535 2536
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2537 2538 2539 2540
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2541
	if (status != 0xff && (status & ATA_BUSY))
2542
		ata_port_printk(ap, KERN_WARNING,
2543 2544
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2545 2546

	timeout = timer_start + tmout;
2547 2548
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2549 2550 2551 2552
		msleep(50);
		status = ata_chk_status(ap);
	}

2553 2554 2555
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2556
	if (status & ATA_BUSY) {
2557
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2558 2559
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2560
		return -EBUSY;
L
Linus Torvalds 已提交
2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
	}

	return 0;
}

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

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

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

		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
2587 2588
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

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

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

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

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2616 2617 2618 2619 2620
	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
2621 2622 2623 2624 2625 2626 2627 2628

	/* 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.
2629 2630
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2631 2632 2633
	 */
	msleep(150);

2634
	/* Before we perform post reset processing we want to see if
2635 2636 2637
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2638 2639
	if (ata_check_status(ap) == 0xFF)
		return 0;
2640

L
Linus Torvalds 已提交
2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658
	ata_bus_post_reset(ap, devmask);

	return 0;
}

/**
 *	ata_bus_reset - reset host port and associated ATA channel
 *	@ap: port to reset
 *
 *	This is typically the first time we actually start issuing
 *	commands to the ATA channel.  We wait for BSY to clear, then
 *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
 *	result.  Determine what devices, if any, are on the channel
 *	by looking at the device 0/1 error register.  Look at the signature
 *	stored in each device's taskfile registers, to determine if
 *	the device is ATA or ATAPI.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2659
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2660
 *	Obtains host lock.
L
Linus Torvalds 已提交
2661 2662
 *
 *	SIDE EFFECTS:
2663
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2664 2665 2666 2667 2668 2669 2670
 */

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
2671
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693

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

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

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

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

	/* issue bus reset */
	if (ap->flags & ATA_FLAG_SRST)
T
Tejun Heo 已提交
2694 2695
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2696 2697 2698 2699

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2700
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2701
	if ((slave_possible) && (err != 0x81))
2702
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2703 2704

	/* re-enable interrupts */
2705
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719

	/* 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
2720
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2721 2722 2723 2724 2725 2726
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2727
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2728 2729 2730 2731 2732
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Make sure SStatus of @ap reaches stable state, determined by
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
 *	beginning of the stable state.  Because, after hot unplugging,
 *	DET gets stuck at 1 on some controllers, this functions waits
 *	until timeout then returns 0 if DET is stable at 1.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
2752
{
2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807
	unsigned long interval_msec = params[0];
	unsigned long duration = params[1] * HZ / 1000;
	unsigned long timeout = jiffies + params[2] * HZ / 1000;
	unsigned long last_jiffies;
	u32 last, cur;
	int rc;

	if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
		if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
			if (cur == 1 && time_before(jiffies, timeout))
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

		/* check timeout */
		if (time_after(jiffies, timeout))
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
{
	u32 scontrol;
2808 2809 2810 2811
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2812

2813
	scontrol = (scontrol & 0x0f0) | 0x300;
2814 2815 2816

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2817

2818 2819 2820 2821
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2822

2823
	return sata_phy_debounce(ap, params);
2824 2825
}

2826 2827 2828 2829 2830 2831 2832 2833
static void ata_wait_spinup(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
	unsigned long end, secs;
	int rc;

	/* first, debounce phy if SATA */
	if (ap->cbl == ATA_CBL_SATA) {
2834
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869

		/* if debounced successfully and offline, no need to wait */
		if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
			return;
	}

	/* okay, let's give the drive time to spin up */
	end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
	secs = ((end - jiffies) + HZ - 1) / HZ;

	if (time_after(jiffies, end))
		return;

	if (secs > 5)
		ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
				"(%lu secs)\n", secs);

	schedule_timeout_uninterruptible(end - jiffies);
}

/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
 *
 *	@ap is about to be reset.  Initialize it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_std_prereset(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
2870
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2871 2872
	int rc;

2873 2874 2875 2876 2877 2878 2879 2880
	/* handle link resume & hotplug spinup */
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

	if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
	    (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
		ata_wait_spinup(ap);
2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905

	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

	/* if SATA, resume phy */
	if (ap->cbl == ATA_CBL_SATA) {
		rc = sata_phy_resume(ap, timing);
		if (rc && rc != -EOPNOTSUPP) {
			/* phy resume failed */
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"link for reset (errno=%d)\n", rc);
			return rc;
		}
	}

	/* Wait for !BSY if the controller can wait for the first D2H
	 * Reg FIS and we don't know that no device is attached.
	 */
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

	return 0;
}

2906 2907 2908 2909 2910
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2911
 *	Reset host port using ATA SRST.
2912 2913 2914 2915 2916 2917 2918
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2919
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2920 2921 2922 2923 2924 2925 2926
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

2927
	if (ata_port_offline(ap)) {
2928 2929 2930 2931
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944
	/* determine if device 0/1 are present */
	if (ata_devchk(ap, 0))
		devmask |= (1 << 0);
	if (slave_possible && ata_devchk(ap, 1))
		devmask |= (1 << 1);

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

	/* issue bus reset */
	DPRINTK("about to softreset, devmask=%x\n", devmask);
	err_mask = ata_bus_softreset(ap, devmask);
	if (err_mask) {
2945 2946
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
2947 2948 2949 2950 2951 2952 2953 2954
		return -EIO;
	}

	/* determine by signature whether we have ATA or ATAPI devices */
	classes[0] = ata_dev_try_classify(ap, 0, &err);
	if (slave_possible && err != 0x81)
		classes[1] = ata_dev_try_classify(ap, 1, &err);

2955
 out:
2956 2957 2958 2959 2960
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
2961
 *	sata_port_hardreset - reset port via SATA phy reset
2962
 *	@ap: port to reset
2963
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
2964 2965 2966 2967 2968 2969 2970 2971 2972
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2973
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
2974
{
2975
	u32 scontrol;
2976
	int rc;
2977

2978 2979
	DPRINTK("ENTER\n");

2980
	if (sata_set_spd_needed(ap)) {
2981 2982 2983 2984 2985
		/* 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.
		 */
2986
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2987
			goto out;
2988

2989
		scontrol = (scontrol & 0x0f0) | 0x304;
2990 2991

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
2992
			goto out;
2993

2994
		sata_set_spd(ap);
2995 2996 2997
	}

	/* issue phy wake/reset */
2998
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
2999
		goto out;
3000

3001
	scontrol = (scontrol & 0x0f0) | 0x301;
3002 3003

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3004
		goto out;
3005

3006
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3007 3008 3009 3010
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3011
	/* bring phy back */
3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045
	rc = sata_phy_resume(ap, timing);
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
 *	@ap: port to reset
 *	@class: resulting class of attached device
 *
 *	SATA phy-reset host port using DET bits of SControl register,
 *	wait for !BSY and classify the attached device.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
	rc = sata_port_hardreset(ap, timing);
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3046 3047

	/* TODO: phy layer with polling, timeouts, etc. */
3048
	if (ata_port_offline(ap)) {
3049 3050 3051 3052 3053
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3054 3055 3056
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3057
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3058 3059
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3060 3061 3062
		return -EIO;
	}

3063 3064
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084
	*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)
{
3085 3086
	u32 serror;

3087 3088 3089
	DPRINTK("ENTER\n");

	/* print link status */
3090
	sata_print_link_status(ap);
3091

3092 3093 3094 3095
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3096
	/* re-enable interrupts */
3097 3098
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3099 3100 3101 3102 3103 3104 3105

	/* 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);

3106 3107 3108 3109 3110 3111 3112
	/* 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
3113 3114
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3115 3116 3117 3118

	DPRINTK("EXIT\n");
}

3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134
/**
 *	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
3135 3136
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3137 3138
{
	const u16 *old_id = dev->id;
3139 3140
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3141 3142 3143
	u64 new_n_sectors;

	if (dev->class != new_class) {
3144 3145
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3146 3147 3148
		return 0;
	}

3149 3150 3151 3152
	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]));
3153 3154 3155
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3156 3157
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3158 3159 3160 3161
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3162 3163
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3164 3165 3166 3167
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3168 3169 3170 3171
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3172 3173 3174 3175 3176 3177 3178 3179 3180
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3181
 *	@readid_flags: read ID flags
3182 3183 3184 3185 3186 3187 3188 3189 3190 3191
 *
 *	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
 */
3192
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3193
{
3194
	unsigned int class = dev->class;
3195
	u16 *id = (void *)dev->ap->sector_buf;
3196 3197
	int rc;

3198 3199 3200 3201
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3202

3203
	/* read ID data */
3204
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3205 3206 3207 3208
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3209
	if (!ata_dev_same_device(dev, class, id)) {
3210 3211 3212 3213
		rc = -ENODEV;
		goto fail;
	}

3214
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3215 3216

	/* configure device according to the new ID */
3217
	rc = ata_dev_configure(dev);
3218 3219
	if (rc == 0)
		return 0;
3220 3221

 fail:
3222
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3223 3224 3225
	return rc;
}

3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

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

	/* Devices we expect to fail diagnostics */

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

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3275
};
3276

3277
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3278
{
T
Tejun Heo 已提交
3279 3280
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3281
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3282

T
Tejun Heo 已提交
3283 3284
	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
3285

3286
	while (ad->model_num) {
T
Tejun Heo 已提交
3287
		if (!strcmp(ad->model_num, model_num)) {
3288 3289
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3290
			if (!strcmp(ad->model_rev, model_rev))
3291
				return ad->horkage;
3292
		}
3293
		ad++;
3294
	}
L
Linus Torvalds 已提交
3295 3296 3297
	return 0;
}

3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309
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;
}

3310 3311 3312 3313
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3314 3315 3316 3317
 *	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...
3318 3319 3320 3321
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3322
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3323
{
T
Tejun Heo 已提交
3324
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3325
	struct ata_host *host = ap->host;
3326
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3327

3328
	/* controller modes available */
3329 3330 3331 3332 3333 3334 3335 3336
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 */
	if (ap->cbl == ATA_CBL_PATA40)
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3337 3338 3339 3340 3341 3342 3343
	/* Apply drive side cable rule. Unknown or 80 pin cables reported
	 * host side are checked drive side as well. Cases where we know a
	 * 40wire cable is used safely for 80 are not checked here.
	 */
        if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);

L
Linus Torvalds 已提交
3344

3345 3346 3347
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3348

3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359
	/*
	 *	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));
	}

3360 3361
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3362 3363
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3364
	}
3365

J
Jeff Garzik 已提交
3366
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
3367 3368 3369
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3370
	}
3371

3372 3373 3374
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3375 3376
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3377 3378 3379 3380 3381 3382
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3383 3384 3385
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3386
 *	LOCKING:
J
Jeff Garzik 已提交
3387
 *	PCI/etc. bus probe sem.
3388 3389 3390
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3391 3392
 */

T
Tejun Heo 已提交
3393
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3394
{
3395
	struct ata_taskfile tf;
3396
	unsigned int err_mask;
L
Linus Torvalds 已提交
3397 3398 3399 3400

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

T
Tejun Heo 已提交
3401
	ata_tf_init(dev, &tf);
3402 3403 3404 3405 3406
	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
3407

T
Tejun Heo 已提交
3408
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3409

3410 3411
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3412 3413
}

3414 3415 3416
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3417 3418
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3419 3420
 *
 *	LOCKING:
3421 3422 3423 3424
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3425
 */
T
Tejun Heo 已提交
3426 3427
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3428
{
3429
	struct ata_taskfile tf;
3430
	unsigned int err_mask;
3431 3432 3433

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3434
		return AC_ERR_INVALID;
3435 3436 3437 3438

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

T
Tejun Heo 已提交
3439
	ata_tf_init(dev, &tf);
3440 3441 3442 3443 3444
	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 */
3445

T
Tejun Heo 已提交
3446
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3447

3448 3449
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3450 3451
}

L
Linus Torvalds 已提交
3452
/**
J
Jeff Garzik 已提交
3453 3454 3455 3456
 *	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
3457 3458
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3459
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3460
 */
3461
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3462 3463
{
	struct ata_port *ap = qc->ap;
3464
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3465
	int dir = qc->dma_dir;
3466
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3467

3468 3469
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3470 3471

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3472
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3473

J
Jeff Garzik 已提交
3474
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3475

3476 3477 3478 3479 3480 3481 3482 3483
	/* 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) {
3484
		if (qc->n_elem)
3485
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3486 3487 3488 3489 3490 3491
		/* 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);
3492
			kunmap_atomic(addr, KM_IRQ0);
3493 3494
		}
	} else {
3495
		if (qc->n_elem)
3496
			dma_unmap_single(ap->dev,
3497 3498
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3499 3500 3501 3502 3503 3504
		/* 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
3505 3506

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3507
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3508 3509 3510 3511 3512 3513
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3514 3515 3516
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3517
 *	LOCKING:
J
Jeff Garzik 已提交
3518
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3519 3520 3521 3522 3523
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3524 3525
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3526

3527
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3528
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3529 3530

	idx = 0;
3531
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564
		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
3565 3566 3567 3568
 *	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
3569
 *	LOCKING:
J
Jeff Garzik 已提交
3570
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3571
 *
L
Linus Torvalds 已提交
3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int rc = 0; /* Assume ATAPI DMA is OK by default */

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

	return rc;
}
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
3589 3590
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3591
 *	LOCKING:
J
Jeff Garzik 已提交
3592
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3593 3594 3595 3596 3597 3598 3599 3600 3601
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3602 3603
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3604 3605 3606 3607 3608 3609 3610 3611 3612 3613
/**
 *	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
3614
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3615 3616
 */

L
Linus Torvalds 已提交
3617 3618 3619 3620
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3621
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3622
	qc->n_elem = 1;
3623
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3624
	qc->buf_virt = buf;
3625
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3626

3627
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3628 3629
}

J
Jeff Garzik 已提交
3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640
/**
 *	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
3641
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3642 3643
 */

L
Linus Torvalds 已提交
3644 3645 3646 3647
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3648
	qc->__sg = sg;
L
Linus Torvalds 已提交
3649
	qc->n_elem = n_elem;
3650
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3651 3652 3653
}

/**
J
Jeff Garzik 已提交
3654 3655 3656 3657
 *	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
3658 3659
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3660
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3661 3662
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3663
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3664 3665 3666 3667 3668 3669
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3670
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3671
	dma_addr_t dma_address;
3672
	int trim_sg = 0;
L
Linus Torvalds 已提交
3673

3674 3675 3676 3677 3678 3679
	/* 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;

3680
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691

		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;
3692 3693
		if (sg->length == 0)
			trim_sg = 1;
3694 3695 3696 3697 3698

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

3699 3700
	if (trim_sg) {
		qc->n_elem--;
3701 3702 3703
		goto skip_map;
	}

3704
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3705
				     sg->length, dir);
3706 3707 3708
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3709
		return -1;
3710
	}
L
Linus Torvalds 已提交
3711 3712

	sg_dma_address(sg) = dma_address;
3713
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3714

3715
skip_map:
L
Linus Torvalds 已提交
3716 3717 3718 3719 3720 3721 3722
	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
3723 3724 3725 3726
 *	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
3727 3728
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3729
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3730 3731
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3732
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3733 3734 3735 3736 3737 3738
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3739 3740
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3741
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3742 3743

	VPRINTK("ENTER, ata%u\n", ap->id);
3744
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3745

3746 3747 3748 3749 3750 3751 3752
	/* 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;

3753
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767

		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);
3768
			kunmap_atomic(addr, KM_IRQ0);
3769 3770 3771 3772 3773 3774
		}

		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;
3775 3776
		if (lsg->length == 0)
			trim_sg = 1;
3777 3778 3779 3780 3781

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

3782 3783 3784 3785 3786 3787 3788 3789 3790
	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
3791
	dir = qc->dma_dir;
3792
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3793 3794 3795
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3796
		return -1;
3797
	}
L
Linus Torvalds 已提交
3798 3799 3800

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

3801
skip_map:
L
Linus Torvalds 已提交
3802 3803 3804 3805 3806
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3807
/**
3808
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3809 3810 3811 3812 3813 3814 3815 3816
 *	@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
3817
 *	Inherited from caller.
E
Edward Falk 已提交
3818
 */
L
Linus Torvalds 已提交
3819 3820 3821 3822 3823 3824 3825 3826 3827 3828
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
3829
/**
T
Tejun Heo 已提交
3830
 *	ata_data_xfer - Transfer data by PIO
3831
 *	@adev: device to target
A
Albert Lee 已提交
3832 3833
 *	@buf: data buffer
 *	@buflen: buffer length
3834
 *	@write_data: read/write
A
Albert Lee 已提交
3835 3836 3837 3838 3839 3840
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3841 3842
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3843
{
3844
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3845
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3846

A
Albert Lee 已提交
3847
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3848
	if (write_data)
T
Tejun Heo 已提交
3849
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3850
	else
T
Tejun Heo 已提交
3851
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
3852 3853 3854 3855 3856 3857 3858 3859

	/* 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
3860
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
3861
		} else {
T
Tejun Heo 已提交
3862
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
3863 3864 3865
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3866 3867
}

3868
/**
T
Tejun Heo 已提交
3869
 *	ata_data_xfer_noirq - Transfer data by PIO
3870 3871 3872 3873 3874
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3875
 *	Transfer data from/to the device data register by PIO. Do the
3876 3877 3878 3879 3880
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3881 3882
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
3883 3884 3885
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
3886
	ata_data_xfer(adev, buf, buflen, write_data);
3887 3888 3889 3890
	local_irq_restore(flags);
}


A
Albert Lee 已提交
3891 3892 3893 3894 3895 3896 3897 3898 3899 3900
/**
 *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
 *	@qc: Command on going
 *
 *	Transfer ATA_SECT_SIZE of data from/to the ATA device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
3901 3902 3903
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3904
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3905 3906 3907 3908 3909
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
3910
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
3911
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3912 3913

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
3914
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
3915 3916 3917 3918 3919 3920 3921

	/* 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");

3922 3923 3924
	if (PageHighMem(page)) {
		unsigned long flags;

3925
		/* FIXME: use a bounce buffer */
3926 3927
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
3928

3929
		/* do the actual data transfer */
3930
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
3931

3932 3933 3934 3935
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
3936
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
3937
	}
L
Linus Torvalds 已提交
3938

T
Tejun Heo 已提交
3939 3940
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
3941

T
Tejun Heo 已提交
3942
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
3943 3944 3945 3946 3947
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

3948 3949 3950 3951
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
3952
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
3953 3954 3955 3956 3957
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
3958

3959 3960 3961 3962 3963 3964
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
3965
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
3966

T
Tejun Heo 已提交
3967 3968
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
3969 3970 3971 3972 3973 3974
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990
/**
 *	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");
3991
	WARN_ON(qc->dev->cdb_len < 12);
3992

3993
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008
	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
4009 4010
}

A
Albert Lee 已提交
4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022
/**
 *	__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
4023 4024 4025
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4026
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4027 4028 4029 4030 4031
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4032
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4033
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4034 4035

next_sg:
4036
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4037
		/*
4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048
		 * 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 */
4049 4050
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4051 4052

		for (i = 0; i < words; i++)
4053
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4054

A
Albert Lee 已提交
4055
		ap->hsm_task_state = HSM_ST_LAST;
4056 4057 4058
		return;
	}

4059
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4060 4061 4062 4063 4064 4065 4066 4067

	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;

4068
	/* don't overrun current sg */
4069
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4070 4071 4072 4073

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

4074 4075
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4076 4077 4078
	if (PageHighMem(page)) {
		unsigned long flags;

4079
		/* FIXME: use bounce buffer */
4080 4081
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4082

4083
		/* do the actual data transfer */
4084
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4085

4086 4087 4088 4089
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4090
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4091
	}
L
Linus Torvalds 已提交
4092 4093 4094 4095 4096

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

4097
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4098 4099 4100 4101
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4102
	if (bytes)
L
Linus Torvalds 已提交
4103 4104 4105
		goto next_sg;
}

A
Albert Lee 已提交
4106 4107 4108 4109 4110 4111 4112 4113 4114 4115
/**
 *	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
4116 4117 4118 4119 4120 4121 4122
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;

4123 4124 4125 4126 4127 4128 4129 4130 4131 4132
	/* 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
4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143
	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;

4144 4145
	VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);

L
Linus Torvalds 已提交
4146 4147 4148 4149 4150
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4151
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4152
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4153
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4154 4155 4156
}

/**
4157 4158 4159
 *	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
4160
 *
4161 4162
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4163
 */
4164 4165

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4166
{
4167 4168
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4169

4170 4171 4172 4173
	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
4174

4175 4176 4177
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4178 4179
	}

4180 4181
	return 0;
}
L
Linus Torvalds 已提交
4182

T
Tejun Heo 已提交
4183 4184 4185 4186 4187 4188 4189 4190
/**
 *	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
4191
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4192 4193 4194 4195 4196 4197 4198 4199 4200
 *	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) {
4201
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4202

J
Jeff Garzik 已提交
4203 4204
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4205 4206 4207 4208
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4209
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4210 4211 4212 4213 4214
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4215
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4216 4217 4218 4219 4220 4221 4222 4223
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4224
			spin_lock_irqsave(ap->lock, flags);
4225
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4226
			ata_qc_complete(qc);
4227
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4228 4229 4230
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4231

4232
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4233 4234
}

4235 4236 4237 4238 4239 4240 4241 4242 4243 4244
/**
 *	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.
 */
4245 4246
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4247
{
4248 4249 4250
	unsigned long flags = 0;
	int poll_next;

4251 4252
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4253 4254 4255 4256
	/* 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).
	 */
4257
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4258

4259
fsm_start:
4260 4261 4262
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state, status);

4263 4264
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4265 4266 4267 4268 4269 4270 4271 4272
		/* 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);

4273
		/* check device status */
4274 4275 4276 4277 4278 4279 4280 4281 4282
		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
4283
			ap->hsm_task_state = HSM_ST_ERR;
4284
			goto fsm_start;
L
Linus Torvalds 已提交
4285 4286
		}

4287 4288
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4289 4290 4291
		 * 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.
4292 4293 4294 4295
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
			       ap->id, status);
4296
			qc->err_mask |= AC_ERR_HSM;
4297 4298
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4299
		}
L
Linus Torvalds 已提交
4300

4301 4302 4303 4304 4305 4306
		/* 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)
4307
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4308

4309 4310 4311 4312
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4313

4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325
			/* 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)
4326
			spin_unlock_irqrestore(ap->lock, flags);
4327 4328 4329 4330

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4331
		break;
4332

4333 4334 4335 4336 4337
	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) {
4338 4339 4340
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4341 4342 4343
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4344

4345 4346
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4347 4348 4349
			 * 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.
4350 4351 4352 4353
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
				       ap->id, status);
4354
				qc->err_mask |= AC_ERR_HSM;
4355 4356
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4357
			}
L
Linus Torvalds 已提交
4358

4359
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4360

4361 4362 4363
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4364

4365 4366 4367 4368
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4369 4370 4371 4372
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4373 4374 4375 4376 4377 4378
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4379

4380 4381 4382
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4383

4384 4385 4386 4387 4388 4389 4390 4391 4392
			/* 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.
4393 4394 4395 4396
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4397 4398 4399 4400 4401 4402 4403

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

4404 4405 4406
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4407 4408 4409 4410 4411 4412
				/* 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;
4413 4414
			}

4415 4416 4417 4418 4419 4420
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4421
				status = ata_wait_idle(ap);
4422 4423 4424 4425 4426
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4427
		poll_next = 1;
L
Linus Torvalds 已提交
4428 4429
		break;

A
Albert Lee 已提交
4430
	case HSM_ST_LAST:
4431 4432
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4433 4434 4435 4436 4437
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4438 4439
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
			ap->id, qc->dev->devno, status);
4440

4441 4442
		WARN_ON(qc->err_mask);

4443
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4444

4445
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4446
		ata_hsm_qc_complete(qc, in_wq);
4447 4448

		poll_next = 0;
L
Linus Torvalds 已提交
4449 4450
		break;

A
Albert Lee 已提交
4451
	case HSM_ST_ERR:
4452 4453 4454 4455 4456 4457
		/* 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;
4458

4459
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4460
		ata_hsm_qc_complete(qc, in_wq);
4461 4462

		poll_next = 0;
4463 4464
		break;
	default:
4465
		poll_next = 0;
4466
		BUG();
L
Linus Torvalds 已提交
4467 4468
	}

4469
	return poll_next;
L
Linus Torvalds 已提交
4470 4471
}

4472
static void ata_pio_task(struct work_struct *work)
4473
{
4474 4475 4476
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4477
	u8 status;
4478
	int poll_next;
4479

J
Jeff Garzik 已提交
4480
fsm_start:
4481
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4482

4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494
	/*
	 * 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) {
4495
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4496 4497
			return;
		}
4498 4499
	}

4500 4501
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4502

4503 4504 4505 4506
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4507
		goto fsm_start;
4508 4509
}

L
Linus Torvalds 已提交
4510 4511 4512 4513 4514 4515
/**
 *	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
4516
 *	None.
L
Linus Torvalds 已提交
4517 4518 4519 4520 4521 4522 4523
 */

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

4524
	/* no command while frozen */
4525
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4526 4527
		return NULL;

4528 4529
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4530
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4531
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545
			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
4546
 *	None.
L
Linus Torvalds 已提交
4547 4548
 */

T
Tejun Heo 已提交
4549
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4550
{
T
Tejun Heo 已提交
4551
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4552 4553 4554 4555 4556 4557 4558 4559
	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
4560
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573
	}

	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
4574
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4575 4576 4577
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4578 4579 4580
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4581
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4582

4583 4584 4585 4586
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4587
		clear_bit(tag, &ap->qc_allocated);
4588
	}
L
Linus Torvalds 已提交
4589 4590
}

4591
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4592
{
4593 4594
	struct ata_port *ap = qc->ap;

4595 4596
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4597 4598 4599 4600

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

4601
	/* command should be marked inactive atomically with qc completion */
4602 4603 4604 4605
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4606

4607 4608 4609 4610 4611
	/* 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;
4612
	ap->qc_active &= ~(1 << qc->tag);
4613

L
Linus Torvalds 已提交
4614
	/* call completion callback */
4615
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4616 4617
}

4618 4619 4620 4621 4622 4623 4624 4625
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

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

4626 4627 4628 4629 4630 4631 4632 4633 4634
/**
 *	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
4635
 *	spin_lock_irqsave(host lock)
4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654
 */
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) {
4655
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4656 4657 4658 4659 4660 4661 4662

		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 */
4663
				fill_result_tf(qc);
4664 4665 4666 4667 4668 4669 4670
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4671
			fill_result_tf(qc);
4672 4673 4674 4675 4676 4677 4678 4679

		__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)
4680
			fill_result_tf(qc);
4681 4682 4683 4684 4685

		__ata_qc_complete(qc);
	}
}

4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697
/**
 *	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
4698
 *	spin_lock_irqsave(host lock)
4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734
 *
 *	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
4735 4736 4737 4738 4739
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4740
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768
	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
4769
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4770
 */
4771
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4772 4773 4774
{
	struct ata_port *ap = qc->ap;

4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788
	/* 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;
	}

4789
	qc->flags |= ATA_QCFLAG_ACTIVE;
4790
	ap->qc_active |= 1 << qc->tag;
4791

L
Linus Torvalds 已提交
4792 4793 4794
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4795
				goto sg_err;
L
Linus Torvalds 已提交
4796 4797
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4798
				goto sg_err;
L
Linus Torvalds 已提交
4799 4800 4801 4802 4803 4804 4805
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4806 4807 4808 4809
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4810

4811 4812
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4813 4814 4815
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826
}

/**
 *	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
4827 4828
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4829
 *	LOCKING:
J
Jeff Garzik 已提交
4830
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4831 4832
 *
 *	RETURNS:
4833
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4834 4835
 */

4836
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4837 4838 4839
{
	struct ata_port *ap = qc->ap;

4840 4841 4842 4843 4844 4845
	/* 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:
4846
		case ATA_PROT_NODATA:
4847 4848 4849 4850 4851 4852
		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)
4853
				/* see ata_dma_blacklisted() */
4854 4855 4856 4857 4858 4859 4860
				BUG();
			break;
		default:
			break;
		}
	}

4861 4862 4863 4864 4865 4866 4867 4868
	/* 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;

4869
	/* select the device */
L
Linus Torvalds 已提交
4870 4871
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4872
	/* start the command */
L
Linus Torvalds 已提交
4873 4874
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4875 4876 4877
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4878
		ata_tf_to_host(ap, &qc->tf);
4879 4880 4881
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
4882
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4883

L
Linus Torvalds 已提交
4884 4885 4886
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
4887
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4888

L
Linus Torvalds 已提交
4889 4890 4891
		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 */
4892
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4893 4894
		break;

4895 4896 4897
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
4898

J
Jeff Garzik 已提交
4899
		ata_tf_to_host(ap, &qc->tf);
4900

4901 4902 4903
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
4904
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4905 4906

			/* always send first data block using
4907
			 * the ata_pio_task() codepath.
4908
			 */
4909
		} else {
4910 4911 4912 4913
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
4914
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
4915 4916 4917 4918

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
4919 4920
		}

L
Linus Torvalds 已提交
4921 4922 4923 4924
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
4925 4926 4927
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4928
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
4929

4930 4931 4932 4933 4934
		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))
4935
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
4936 4937 4938
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
4939
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4940

L
Linus Torvalds 已提交
4941 4942
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
4943 4944 4945 4946
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4947
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
4948 4949 4950 4951
		break;

	default:
		WARN_ON(1);
4952
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967
	}

	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
4968
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4969 4970 4971 4972 4973 4974 4975 4976
 *
 *	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)
{
4977
	struct ata_eh_info *ehi = &ap->eh_info;
4978
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
4979

4980 4981
	VPRINTK("ata%u: protocol %d task_state %d\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
4982

4983 4984 4985
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4986 4987 4988
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
4989

4990 4991 4992 4993 4994
		/* 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
4995 4996
			goto idle_irq;
		break;
4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
			VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);

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

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
5010 5011 5012 5013 5014 5015

			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;
			}
5016 5017 5018 5019
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5020 5021 5022 5023
	default:
		goto idle_irq;
	}

5024 5025 5026 5027
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5028

5029 5030 5031 5032
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5033

5034 5035
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5036

5037
	ata_hsm_move(ap, qc, status, 0);
5038 5039 5040 5041 5042

	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
5043 5044 5045 5046 5047 5048 5049
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5050
		ap->ops->irq_ack(ap, 0); /* debug trap */
5051
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5052
		return 1;
L
Linus Torvalds 已提交
5053 5054 5055 5056 5057 5058 5059
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5060
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5061
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5062
 *
J
Jeff Garzik 已提交
5063 5064 5065
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5066
 *	LOCKING:
J
Jeff Garzik 已提交
5067
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5068 5069
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5070
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5071 5072
 */

5073
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5074
{
J
Jeff Garzik 已提交
5075
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5076 5077 5078 5079 5080
	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
5081
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5082

J
Jeff Garzik 已提交
5083
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5084 5085
		struct ata_port *ap;

J
Jeff Garzik 已提交
5086
		ap = host->ports[i];
5087
		if (ap &&
J
Jeff Garzik 已提交
5088
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5089 5090 5091
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5092
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5093
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5094 5095 5096 5097
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5098
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5099 5100 5101 5102

	return IRQ_RETVAL(handled);
}

5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239
/**
 *	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
5240

5241
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5242
{
5243
	unsigned int err_mask;
J
Jens Axboe 已提交
5244 5245 5246 5247 5248
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5249
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5250 5251 5252 5253
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5254 5255 5256 5257 5258 5259 5260
	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
5261 5262
}

J
Jeff Garzik 已提交
5263 5264 5265
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5266 5267 5268 5269
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5270 5271
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310

		/* 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
5311 5312
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5313 5314
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5315
 *	Suspend @host.  Actual operation is performed by EH.  This
5316 5317 5318 5319 5320 5321 5322 5323 5324
 *	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
5325
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5326 5327 5328
{
	int i, j, rc;

J
Jeff Garzik 已提交
5329
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5330 5331 5332 5333 5334 5335 5336
	if (rc)
		goto fail;

	/* EH is quiescent now.  Fail if we have any ready device.
	 * This happens if hotplug occurs between completion of device
	 * suspension and here.
	 */
J
Jeff Garzik 已提交
5337 5338
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352

		for (j = 0; j < ATA_MAX_DEVICES; j++) {
			struct ata_device *dev = &ap->device[j];

			if (ata_dev_ready(dev)) {
				ata_port_printk(ap, KERN_WARNING,
						"suspend failed, device %d "
						"still active\n", dev->devno);
				rc = -EBUSY;
				goto fail;
			}
		}
	}

J
Jeff Garzik 已提交
5353
	host->dev->power.power_state = mesg;
5354 5355 5356
	return 0;

 fail:
J
Jeff Garzik 已提交
5357
	ata_host_resume(host);
5358 5359 5360 5361
	return rc;
}

/**
J
Jeff Garzik 已提交
5362 5363
 *	ata_host_resume - resume host
 *	@host: host to resume
5364
 *
J
Jeff Garzik 已提交
5365
 *	Resume @host.  Actual operation is performed by EH.  This
5366 5367 5368 5369 5370 5371
 *	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
5372
void ata_host_resume(struct ata_host *host)
5373
{
J
Jeff Garzik 已提交
5374 5375 5376
	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;
5377 5378
}

5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390
/**
 *	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.
 */
5391
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5392
{
5393
	struct device *dev = ap->dev;
5394
	int rc;
L
Linus Torvalds 已提交
5395

5396 5397
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5398 5399 5400
	if (!ap->prd)
		return -ENOMEM;

5401
	rc = ata_pad_alloc(ap, dev);
5402
	if (rc)
5403
		return rc;
L
Linus Torvalds 已提交
5404

5405 5406
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5407 5408 5409
	return 0;
}

5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421
/**
 *	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;
5422 5423
	unsigned long flags;

5424 5425 5426
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5427 5428
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5429
	 * host lock.
5430
	 */
5431
	spin_lock_irqsave(ap->lock, flags);
5432
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5433
	spin_unlock_irqrestore(ap->lock, flags);
5434

5435 5436
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5437 5438 5439 5440 5441
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5442
/**
B
Brian King 已提交
5443
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5444
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5445
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5446 5447 5448
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5449
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5450
 *
L
Linus Torvalds 已提交
5451
 *	LOCKING:
J
Jeff Garzik 已提交
5452
 *	Inherited from caller.
L
Linus Torvalds 已提交
5453
 */
J
Jeff Garzik 已提交
5454
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5455
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5456 5457 5458
{
	unsigned int i;

J
Jeff Garzik 已提交
5459
	ap->lock = &host->lock;
5460
	ap->flags = ATA_FLAG_DISABLED;
B
Brian King 已提交
5461
	ap->id = ata_unique_id++;
L
Linus Torvalds 已提交
5462
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5463
	ap->host = host;
5464
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5465
	ap->port_no = port_no;
5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478
	if (port_no == 1 && ent->pinfo2) {
		ap->pio_mask = ent->pinfo2->pio_mask;
		ap->mwdma_mask = ent->pinfo2->mwdma_mask;
		ap->udma_mask = ent->pinfo2->udma_mask;
		ap->flags |= ent->pinfo2->flags;
		ap->ops = ent->pinfo2->port_ops;
	} else {
		ap->pio_mask = ent->pio_mask;
		ap->mwdma_mask = ent->mwdma_mask;
		ap->udma_mask = ent->udma_mask;
		ap->flags |= ent->port_flags;
		ap->ops = ent->port_ops;
	}
5479
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5480 5481
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5482 5483 5484 5485 5486 5487

#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
5488
#else
5489
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5490
#endif
L
Linus Torvalds 已提交
5491

5492 5493 5494
	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);
5495
	INIT_LIST_HEAD(&ap->eh_done_q);
5496
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5497

5498 5499 5500 5501 5502
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5503 5504
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5505
		dev->ap = ap;
5506
		dev->devno = i;
5507
		ata_dev_init(dev);
5508
	}
L
Linus Torvalds 已提交
5509 5510 5511 5512 5513 5514 5515 5516 5517

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

	memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
}

B
Brian King 已提交
5518
/**
5519 5520 5521
 *	ata_port_init_shost - Initialize SCSI host associated with ATA port
 *	@ap: ATA port to initialize SCSI host for
 *	@shost: SCSI host associated with @ap
B
Brian King 已提交
5522
 *
5523
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5524 5525 5526 5527
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5528
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5529
{
J
Jeff Garzik 已提交
5530
	ap->scsi_host = shost;
B
Brian King 已提交
5531

5532 5533 5534 5535 5536
	shost->unique_id = ap->id;
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5537 5538
}

L
Linus Torvalds 已提交
5539
/**
5540
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5541
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5542
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5543 5544
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5545 5546
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5547
 *	LOCKING:
J
Jeff Garzik 已提交
5548
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5549 5550
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5551
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5552
 */
5553
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5554
				      struct ata_host *host,
L
Linus Torvalds 已提交
5555 5556
				      unsigned int port_no)
{
5557
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5558 5559 5560
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5561

5562
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5563
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5564 5565 5566 5567 5568
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5569 5570
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5571 5572
		return NULL;

5573
	shost->transportt = &ata_scsi_transport_template;
5574

5575
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5576

J
Jeff Garzik 已提交
5577
	ata_port_init(ap, host, ent, port_no);
5578
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5579 5580 5581 5582

	return ap;
}

5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

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

		if (!ap)
			continue;

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

		scsi_host_put(ap->scsi_host);
	}

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

5604
/**
J
Jeff Garzik 已提交
5605 5606 5607 5608 5609
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5610 5611 5612 5613 5614 5615
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5616 5617
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5618
{
J
Jeff Garzik 已提交
5619 5620 5621 5622
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5623 5624
}

L
Linus Torvalds 已提交
5625
/**
J
Jeff Garzik 已提交
5626 5627 5628 5629 5630 5631 5632 5633 5634 5635
 *	ata_device_add - Register hardware device with ATA and SCSI layers
 *	@ent: Probe information describing hardware device to be registered
 *
 *	This function processes the information provided in the probe
 *	information struct @ent, allocates the necessary ATA and SCSI
 *	host information structures, initializes them, and registers
 *	everything with requisite kernel subsystems.
 *
 *	This function requests irqs, probes the ATA bus, and probes
 *	the SCSI bus.
L
Linus Torvalds 已提交
5636 5637
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5638
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5639 5640
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5641
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5642
 */
J
Jeff Garzik 已提交
5643
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5644
{
5645
	unsigned int i;
L
Linus Torvalds 已提交
5646
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5647
	struct ata_host *host;
5648
	int rc;
L
Linus Torvalds 已提交
5649 5650

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5651

5652 5653 5654 5655
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5656 5657 5658 5659

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

L
Linus Torvalds 已提交
5660
	/* alloc a container for our list of ATA ports (buses) */
5661 5662
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5663
	if (!host)
5664 5665 5666
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5667

J
Jeff Garzik 已提交
5668 5669 5670 5671
	ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
	host->n_ports = ent->n_ports;
	host->irq = ent->irq;
	host->irq2 = ent->irq2;
T
Tejun Heo 已提交
5672
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5673
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5674 5675

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5676
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5677 5678
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5679
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5680

J
Jeff Garzik 已提交
5681
		ap = ata_port_add(ent, host, i);
5682
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5683 5684 5685
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5686 5687 5688 5689 5690 5691 5692 5693 5694 5695
		/* dummy? */
		if (ent->dummy_port_mask & (1 << i)) {
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
			ap->ops = &ata_dummy_port_ops;
			continue;
		}

		/* start port */
		rc = ap->ops->port_start(ap);
		if (rc) {
J
Jeff Garzik 已提交
5696 5697
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5698 5699 5700
			goto err_out;
		}

5701 5702 5703 5704
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5705 5706 5707 5708 5709
		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
				(ap->pio_mask << ATA_SHIFT_PIO);

		/* print per-port info to dmesg */
T
Tejun Heo 已提交
5710 5711
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5712 5713 5714 5715 5716
				ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
				ata_mode_string(xfer_mode_mask),
				ap->ioaddr.cmd_addr,
				ap->ioaddr.ctl_addr,
				ap->ioaddr.bmdma_addr,
5717
				irq_line);
L
Linus Torvalds 已提交
5718

5719 5720
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5721 5722
	}

5723
	/* obtain irq, that may be shared between channels */
5724 5725
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5726 5727 5728
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5729
		goto err_out;
5730
	}
L
Linus Torvalds 已提交
5731

5732 5733 5734 5735 5736 5737
	/* do we have a second IRQ for the other channel, eg legacy mode */
	if (ent->irq2) {
		/* We will get weird core code crashes later if this is true
		   so trap it now */
		BUG_ON(ent->irq == ent->irq2);

5738 5739 5740
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5741 5742 5743
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5744
			goto err_out;
5745 5746 5747
		}
	}

5748
	/* resource acquisition complete */
T
Tejun Heo 已提交
5749
	devres_remove_group(dev, ata_device_add);
5750

L
Linus Torvalds 已提交
5751 5752
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5753 5754
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5755
		u32 scontrol;
L
Linus Torvalds 已提交
5756 5757
		int rc;

5758 5759 5760 5761 5762 5763 5764
		/* init sata_spd_limit to the current value */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
			ap->hw_sata_spd_limit &= (1 << spd) - 1;
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

J
Jeff Garzik 已提交
5765
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5766
		if (rc) {
5767
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5768 5769 5770 5771 5772 5773
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5774

5775
		if (ap->ops->error_handler) {
5776
			struct ata_eh_info *ehi = &ap->eh_info;
5777 5778 5779 5780 5781
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5782
			spin_lock_irqsave(ap->lock, flags);
5783

5784 5785 5786
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5787

5788
			ap->pflags |= ATA_PFLAG_LOADING;
5789 5790
			ata_port_schedule_eh(ap);

5791
			spin_unlock_irqrestore(ap->lock, flags);
5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808

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

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
L
Linus Torvalds 已提交
5809 5810 5811
	}

	/* probes are done, now scan each port's disk(s) */
5812
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5813 5814
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5815

J
Jeff Garzik 已提交
5816
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5817 5818 5819 5820 5821
	}

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

5822 5823 5824 5825
 err_out:
	devres_release_group(dev, ata_device_add);
	dev_set_drvdata(dev, NULL);
	VPRINTK("EXIT, returning %d\n", rc);
L
Linus Torvalds 已提交
5826 5827 5828
	return 0;
}

5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845
/**
 *	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)
5846
		goto skip_eh;
5847 5848

	/* tell EH we're leaving & flush EH */
5849
	spin_lock_irqsave(ap->lock, flags);
5850
	ap->pflags |= ATA_PFLAG_UNLOADING;
5851
	spin_unlock_irqrestore(ap->lock, flags);
5852 5853 5854 5855 5856 5857

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5858
	spin_lock_irqsave(ap->lock, flags);
5859 5860 5861 5862

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

5863
	spin_unlock_irqrestore(ap->lock, flags);
5864 5865 5866 5867 5868

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5869
	spin_lock_irqsave(ap->lock, flags);
5870
	ata_port_freeze(ap);	/* won't be thawed */
5871
	spin_unlock_irqrestore(ap->lock, flags);
5872 5873 5874 5875 5876 5877 5878 5879 5880 5881

	ata_port_wait_eh(ap);

	/* Flush hotplug task.  The sequence is similar to
	 * ata_port_flush_task().
	 */
	flush_workqueue(ata_aux_wq);
	cancel_delayed_work(&ap->hotplug_task);
	flush_workqueue(ata_aux_wq);

5882
 skip_eh:
5883
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5884
	scsi_remove_host(ap->scsi_host);
5885 5886
}

T
Tejun Heo 已提交
5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903
/**
 *	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]);
}

5904 5905 5906 5907 5908
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

5909 5910 5911 5912 5913
	/* XXX - the following if can go away once all LLDs are managed */
	if (!list_empty(&dev->devres_head))
		probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
	else
		probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
5914 5915 5916 5917 5918 5919 5920 5921 5922 5923
	if (!probe_ent) {
		printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
		       kobject_name(&(dev->kobj)));
		return NULL;
	}

	INIT_LIST_HEAD(&probe_ent->node);
	probe_ent->dev = dev;

	probe_ent->sht = port->sht;
J
Jeff Garzik 已提交
5924
	probe_ent->port_flags = port->flags;
5925 5926 5927 5928
	probe_ent->pio_mask = port->pio_mask;
	probe_ent->mwdma_mask = port->mwdma_mask;
	probe_ent->udma_mask = port->udma_mask;
	probe_ent->port_ops = port->port_ops;
5929
	probe_ent->private_data = port->private_data;
5930 5931 5932 5933

	return probe_ent;
}

L
Linus Torvalds 已提交
5934 5935 5936
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
5937 5938 5939 5940 5941 5942 5943
 *
 *	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
5944
 */
E
Edward Falk 已提交
5945

L
Linus Torvalds 已提交
5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959
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;
}

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5961 5962
#ifdef CONFIG_PCI

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/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
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 *	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.
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 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
5974
void ata_pci_remove_one(struct pci_dev *pdev)
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{
	struct device *dev = pci_dev_to_dev(pdev);
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	struct ata_host *host = dev_get_drvdata(dev);
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T
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	ata_host_detach(host);
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}

/* move to PCI subsystem */
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int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
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{
	unsigned long tmp = 0;

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

	default:
		return -EINVAL;
	}

	tmp &= bits->mask;

	return (tmp == bits->val) ? 1 : 0;
}
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6016
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
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{
	pci_save_state(pdev);
6019

6020
	if (mesg.event == PM_EVENT_SUSPEND) {
6021 6022 6023
		pci_disable_device(pdev);
		pci_set_power_state(pdev, PCI_D3hot);
	}
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}

6026
int ata_pci_device_do_resume(struct pci_dev *pdev)
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{
6028 6029
	int rc;

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	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6032

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	rc = pcim_enable_device(pdev);
6034 6035 6036 6037 6038 6039
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

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	pci_set_master(pdev);
6041
	return 0;
6042 6043
}

6044
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6045
{
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Jeff Garzik 已提交
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	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6047 6048
	int rc = 0;

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	rc = ata_host_suspend(host, mesg);
6050 6051 6052
	if (rc)
		return rc;

6053
	ata_pci_device_do_suspend(pdev, mesg);
6054 6055 6056 6057 6058 6059

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
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	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6061
	int rc;
6062

6063 6064 6065 6066
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
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}
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#endif /* CONFIG_PCI */


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

6078 6079 6080 6081 6082 6083
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

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

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6091
	destroy_workqueue(ata_aux_wq);
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Linus Torvalds 已提交
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}

6094
subsys_initcall(ata_init);
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module_exit(ata_exit);

6097
static unsigned long ratelimit_time;
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Ingo Molnar 已提交
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static DEFINE_SPINLOCK(ata_ratelimit_lock);
6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117

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;
}

6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

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

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

	return tmp;
}

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

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

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

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

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/*
 * libata is essentially a library of internal helper functions for
 * low-level ATA host controller drivers.  As such, the API/ABI is
 * likely to change as new drivers are added and updated.
 * Do not depend on ABI/API stability.
 */

6204 6205 6206
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
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EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
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EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
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EXPORT_SYMBOL_GPL(ata_host_init);
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EXPORT_SYMBOL_GPL(ata_device_add);
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EXPORT_SYMBOL_GPL(ata_host_detach);
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EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6215
EXPORT_SYMBOL_GPL(ata_hsm_move);
6216
EXPORT_SYMBOL_GPL(ata_qc_complete);
6217
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
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EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
EXPORT_SYMBOL_GPL(ata_interrupt);
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EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
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EXPORT_SYMBOL_GPL(ata_qc_prep);
6233
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
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EXPORT_SYMBOL_GPL(ata_bmdma_setup);
EXPORT_SYMBOL_GPL(ata_bmdma_start);
EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
EXPORT_SYMBOL_GPL(ata_bmdma_status);
EXPORT_SYMBOL_GPL(ata_bmdma_stop);
6239 6240 6241 6242 6243
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);
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EXPORT_SYMBOL_GPL(ata_port_probe);
6245
EXPORT_SYMBOL_GPL(sata_set_spd);
6246 6247
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6248 6249 6250
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6251
EXPORT_SYMBOL_GPL(ata_std_prereset);
6252
EXPORT_SYMBOL_GPL(ata_std_softreset);
6253
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6254 6255
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6256 6257
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
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6258
EXPORT_SYMBOL_GPL(ata_port_disable);
6259
EXPORT_SYMBOL_GPL(ata_ratelimit);
6260
EXPORT_SYMBOL_GPL(ata_wait_register);
6261
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6262
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
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6263 6264 6265
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6266
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6267
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
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EXPORT_SYMBOL_GPL(ata_host_intr);
6269 6270 6271 6272 6273 6274
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
EXPORT_SYMBOL_GPL(ata_port_online);
EXPORT_SYMBOL_GPL(ata_port_offline);
J
Jeff Garzik 已提交
6275 6276
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6277 6278
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6279
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6280 6281
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6282
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6283 6284 6285
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
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6286 6287 6288 6289 6290
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6291 6292
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6293 6294
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
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6295 6296
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
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6297
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6298 6299 6300

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6301 6302

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6303 6304
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6305 6306 6307
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6308 6309
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
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Tejun Heo 已提交
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EXPORT_SYMBOL_GPL(ata_do_eh);
6311 6312 6313 6314
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);