libata-core.c 154.0 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

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

#include "libata.h"

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


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

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

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

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

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

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

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

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

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

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))
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		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
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	if (wait)
		ata_wait_idle(ap);

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
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
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1396

1397
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1398

1399
 retry:
T
Tejun Heo 已提交
1400
	ata_tf_init(dev, &tf);
1401

1402 1403
	switch (class) {
	case ATA_DEV_ATA:
1404
		tf.command = ATA_CMD_ID_ATA;
1405 1406
		break;
	case ATA_DEV_ATAPI:
1407
		tf.command = ATA_CMD_ID_ATAPI;
1408 1409 1410 1411 1412
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1413 1414
	}

1415
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425

	/* 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
1426

T
Tejun Heo 已提交
1427
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1428
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1429
	if (err_mask) {
1430
		if (err_mask & AC_ERR_NODEV_HINT) {
1431
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1432
				ap->print_id, dev->devno);
1433 1434 1435
			return -ENOENT;
		}

1436 1437
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1438 1439 1440
		goto err_out;
	}

1441
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1442

1443
	/* sanity check */
1444 1445 1446 1447 1448 1449 1450 1451 1452
	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;
1453 1454
	}

1455
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1456 1457 1458 1459 1460 1461 1462 1463 1464
		/*
		 * 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
1465
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1466 1467 1468 1469 1470 1471 1472 1473 1474
			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.
			 */
1475
			flags &= ~ATA_READID_POSTRESET;
1476 1477 1478 1479 1480
			goto retry;
		}
	}

	*p_class = class;
1481

1482 1483 1484
	return 0;

 err_out:
T
Tejun Heo 已提交
1485
	if (ata_msg_warn(ap))
1486
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1487
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1488 1489 1490
	return rc;
}

T
Tejun Heo 已提交
1491
static inline u8 ata_dev_knobble(struct ata_device *dev)
1492
{
T
Tejun Heo 已提交
1493
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1494 1495
}

1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
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;
	}
1506 1507 1508 1509
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1510
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1511
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1512 1513 1514 1515 1516 1517 1518 1519 1520
		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);
}

1521 1522 1523 1524
static void ata_set_port_max_cmd_len(struct ata_port *ap)
{
	int i;

J
Jeff Garzik 已提交
1525 1526 1527
	if (ap->scsi_host) {
		unsigned int len = 0;

1528
		for (i = 0; i < ATA_MAX_DEVICES; i++)
J
Jeff Garzik 已提交
1529 1530 1531
			len = max(len, ap->device[i].cdb_len);

		ap->scsi_host->max_cmd_len = len;
1532 1533 1534
	}
}

1535
/**
1536 1537 1538 1539 1540
 *	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.
1541 1542
 *
 *	LOCKING:
1543 1544 1545 1546
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1547
 */
1548
int ata_dev_configure(struct ata_device *dev)
1549
{
T
Tejun Heo 已提交
1550
	struct ata_port *ap = dev->ap;
1551
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1552
	const u16 *id = dev->id;
1553
	unsigned int xfer_mask;
1554
	char revbuf[7];		/* XYZ-99\0 */
1555 1556
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1557
	int rc;
1558

1559
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1560 1561
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1562
		return 0;
1563 1564
	}

1565
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1566
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1567

1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
	/* set _SDD */
	rc = ata_acpi_push_id(ap, dev->devno);
	if (rc) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set _SDD(%d)\n",
			rc);
	}

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

1578
	/* print device capabilities */
1579
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1580 1581 1582
		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",
1583
			       __FUNCTION__,
1584 1585
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1586

1587
	/* initialize to-be-configured parameters */
1588
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1589 1590 1591 1592 1593 1594 1595
	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
1596 1597 1598 1599
	/*
	 * common ATA, ATAPI feature tests
	 */

1600
	/* find max transfer mode; for printk only */
1601
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1602

1603 1604
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1605 1606 1607

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1608 1609
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1610 1611 1612
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1613 1614 1615 1616 1617
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1618
		dev->n_sectors = ata_id_n_sectors(id);
1619

1620
		/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
1621
		ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
1622 1623
				sizeof(fwrevbuf));

1624
		ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
1625 1626 1627 1628 1629
				sizeof(modelbuf));

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

1630
		if (ata_id_has_lba(id)) {
1631
			const char *lba_desc;
1632
			char ncq_desc[20];
1633

1634 1635
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1636
			if (ata_id_has_lba48(id)) {
1637
				dev->flags |= ATA_DFLAG_LBA48;
1638
				lba_desc = "LBA48";
1639 1640 1641 1642

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1643
			}
1644

1645 1646 1647
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1648
			/* print device info to dmesg */
1649 1650 1651 1652 1653 1654 1655
			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",
1656
					(unsigned long long)dev->n_sectors,
1657 1658
					dev->multi_count, lba_desc, ncq_desc);
			}
1659
		} else {
1660 1661 1662
			/* CHS */

			/* Default translation */
1663 1664 1665
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1666

1667
			if (ata_id_current_chs_valid(id)) {
1668
				/* Current CHS translation is valid. */
1669 1670 1671
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1672 1673 1674
			}

			/* print device info to dmesg */
1675
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1676
				ata_dev_printk(dev, KERN_INFO,
1677 1678 1679 1680 1681 1682 1683 1684 1685
					"%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);
			}
1686 1687
		}

1688
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1689 1690 1691
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1692
	else if (dev->class == ATA_DEV_ATAPI) {
1693 1694
		char *cdb_intr_string = "";

1695
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1696
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1697
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1698 1699
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1700
			rc = -EINVAL;
L
Linus Torvalds 已提交
1701 1702
			goto err_out_nosup;
		}
1703
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1704

1705
		if (ata_id_cdb_intr(dev->id)) {
1706
			dev->flags |= ATA_DFLAG_CDB_INTR;
1707 1708
			cdb_intr_string = ", CDB intr";
		}
1709

L
Linus Torvalds 已提交
1710
		/* print device info to dmesg */
1711
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1712 1713 1714
			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
1715 1716
	}

1717 1718 1719 1720 1721
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	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");
		}
	}

1734
	ata_set_port_max_cmd_len(ap);
1735

1736
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1737
	if (ata_dev_knobble(dev)) {
1738
		if (ata_msg_drv(ap) && print_info)
1739 1740
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1741
		dev->udma_mask &= ATA_UDMA5;
1742 1743 1744 1745 1746 1747
		dev->max_sectors = ATA_MAX_SECTORS;
	}

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

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
	int tries[ATA_MAX_DEVICES];
1779
	int i, rc;
1780
	struct ata_device *dev;
L
Linus Torvalds 已提交
1781

1782
	ata_port_probe(ap);
1783

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

 retry:
1788
	/* reset and determine device classes */
1789
	ap->ops->phy_reset(ap);
1790

1791 1792
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1793

1794 1795 1796 1797 1798
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1799

1800
		dev->class = ATA_DEV_UNKNOWN;
1801
	}
L
Linus Torvalds 已提交
1802

1803
	ata_port_probe(ap);
1804

A
Alan Cox 已提交
1805 1806 1807 1808 1809 1810
	/* 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;

1811
	/* read IDENTIFY page and configure devices */
L
Linus Torvalds 已提交
1812
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1813
		dev = &ap->device[i];
1814

1815 1816
		if (tries[i])
			dev->class = classes[i];
1817

1818
		if (!ata_dev_enabled(dev))
1819 1820
			continue;

1821 1822
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1823 1824 1825
		if (rc)
			goto fail;

1826 1827 1828
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1829 1830
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1831 1832
	}

1833
	/* configure transfer mode */
1834
	rc = ata_set_mode(ap, &dev);
1835
	if (rc)
1836
		goto fail;
L
Linus Torvalds 已提交
1837

1838 1839 1840
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1841

1842 1843
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1844
	ap->ops->port_disable(ap);
1845
	return -ENODEV;
1846 1847

 fail:
1848 1849
	tries[dev->devno]--;

1850 1851
	switch (rc) {
	case -EINVAL:
1852
		/* eeek, something went very wrong, give up */
1853 1854
		tries[dev->devno] = 0;
		break;
1855 1856 1857 1858

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
1859
	case -EIO:
1860 1861 1862 1863 1864 1865 1866
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
			sata_down_spd_limit(ap);
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
1867 1868
	}

1869
	if (!tries[dev->devno])
T
Tejun Heo 已提交
1870
		ata_dev_disable(dev);
1871

1872
	goto retry;
L
Linus Torvalds 已提交
1873 1874 1875
}

/**
J
Jeff Garzik 已提交
1876 1877
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1878
 *
J
Jeff Garzik 已提交
1879 1880 1881
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1882
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1883
 *	serialization.
L
Linus Torvalds 已提交
1884 1885 1886 1887
 */

void ata_port_probe(struct ata_port *ap)
{
1888
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1889 1890
}

1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
/**
 *	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)
{
1902
	u32 sstatus, scontrol, tmp;
1903

1904
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1905
		return;
1906
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1907

1908
	if (ata_port_online(ap)) {
1909
		tmp = (sstatus >> 4) & 0xf;
1910 1911 1912
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1913
	} else {
1914 1915 1916
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1917 1918 1919
	}
}

L
Linus Torvalds 已提交
1920
/**
J
Jeff Garzik 已提交
1921 1922
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1923
 *
J
Jeff Garzik 已提交
1924 1925 1926
 *	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
1927 1928
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1929
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1930 1931 1932 1933 1934 1935 1936 1937
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1938
		/* issue phy wake/reset */
1939
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1940 1941 1942
		/* 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
1943
	}
1944 1945
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1946 1947 1948 1949

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1950
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1951 1952 1953 1954
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1955 1956
	/* print link status */
	sata_print_link_status(ap);
1957

1958
	/* TODO: phy layer with polling, timeouts, etc. */
1959
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
1960
		ata_port_probe(ap);
1961
	else
L
Linus Torvalds 已提交
1962 1963
		ata_port_disable(ap);

1964
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
		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
1976 1977
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1978
 *
J
Jeff Garzik 已提交
1979 1980
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
1981 1982
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1983
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1984 1985 1986 1987 1988
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
1989
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
1990 1991 1992 1993
		return;
	ata_bus_reset(ap);
}

1994 1995 1996 1997 1998 1999 2000
/**
 *	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
 */
2001

T
Tejun Heo 已提交
2002
struct ata_device *ata_dev_pair(struct ata_device *adev)
2003
{
T
Tejun Heo 已提交
2004
	struct ata_port *ap = adev->ap;
2005
	struct ata_device *pair = &ap->device[1 - adev->devno];
2006
	if (!ata_dev_enabled(pair))
2007 2008 2009 2010
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2011
/**
J
Jeff Garzik 已提交
2012 2013
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2014
 *
J
Jeff Garzik 已提交
2015 2016 2017 2018 2019
 *	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
2020
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2021
 *	serialization.
L
Linus Torvalds 已提交
2022 2023 2024 2025 2026 2027
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2028
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2029 2030
}

2031
/**
2032
 *	sata_down_spd_limit - adjust SATA spd limit downward
2033 2034 2035 2036
 *	@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
2037
 *	using sata_set_spd().
2038 2039 2040 2041 2042 2043 2044
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2045
int sata_down_spd_limit(struct ata_port *ap)
2046
{
2047 2048
	u32 sstatus, spd, mask;
	int rc, highbit;
2049

2050 2051 2052
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2053 2054 2055 2056 2057 2058 2059

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

2060
	spd = (sstatus >> 4) & 0xf;
2061 2062 2063 2064 2065 2066 2067 2068 2069
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2070 2071
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2072 2073 2074 2075

	return 0;
}

2076
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091
{
	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;
}

/**
2092
 *	sata_set_spd_needed - is SATA spd configuration needed
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
 *	@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.
 */
2106
int sata_set_spd_needed(struct ata_port *ap)
2107 2108 2109
{
	u32 scontrol;

2110
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2111 2112
		return 0;

2113
	return __sata_set_spd_needed(ap, &scontrol);
2114 2115 2116
}

/**
2117
 *	sata_set_spd - set SATA spd according to spd limit
2118 2119 2120 2121 2122 2123 2124 2125 2126
 *	@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
2127
 *	changed.  Negative errno if SCR registers are inaccessible.
2128
 */
2129
int sata_set_spd(struct ata_port *ap)
2130 2131
{
	u32 scontrol;
2132
	int rc;
2133

2134 2135
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2136

2137
	if (!__sata_set_spd_needed(ap, &scontrol))
2138 2139
		return 0;

2140 2141 2142
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2143 2144 2145
	return 1;
}

A
Alan Cox 已提交
2146 2147 2148 2149 2150
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2151
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2152
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2153 2154 2155
 * 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
2156 2157 2158 2159 2160 2161 2162 2163 2164
 */

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 },

2165 2166
	{ 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
2167 2168 2169 2170 2171
	{ 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 }, */
2172

A
Alan Cox 已提交
2173 2174 2175
	{ 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 },
2176

A
Alan Cox 已提交
2177 2178 2179 2180
	{ 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 },

2181 2182
	{ 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
2183 2184 2185 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
	{ 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
2228
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2229
			return NULL;
2230
	return t;
A
Alan Cox 已提交
2231 2232 2233 2234 2235 2236 2237 2238 2239
}

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;

	/*
2240
	 * Find the mode.
2241
	 */
A
Alan Cox 已提交
2242 2243 2244 2245

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

2246 2247
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267
	/*
	 * 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.
	 */

2268
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2269 2270

	/*
2271 2272 2273
	 * 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
2274 2275
	 */

2276
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2277 2278 2279 2280 2281
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2282
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297
	 */

	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;
}

2298 2299 2300
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2301
 *	@sel: ATA_DNXFER_* selector
2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
 *
 *	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
 */
2313
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2314
{
2315 2316 2317 2318
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2319

2320 2321
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2322

2323 2324 2325 2326
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2327

2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

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

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

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

	default:
		BUG();
	}

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

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

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

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
2380 2381 2382 2383 2384 2385 2386

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

	return 0;
}

T
Tejun Heo 已提交
2387
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2388
{
2389
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2390 2391
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2392

2393
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2394 2395 2396
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2397
	err_mask = ata_dev_set_xfermode(dev);
2398 2399 2400 2401
	/* 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;

2402
	if (err_mask) {
2403 2404
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2405 2406
		return -EIO;
	}
L
Linus Torvalds 已提交
2407

2408
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2409
	rc = ata_dev_revalidate(dev, 0);
2410
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2411
	if (rc)
2412
		return rc;
2413

2414 2415
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2416

2417 2418
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2419
	return 0;
L
Linus Torvalds 已提交
2420 2421 2422 2423 2424
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2425
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2426
 *
2427 2428 2429
 *	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
2430
 *
L
Linus Torvalds 已提交
2431
 *	LOCKING:
J
Jeff Garzik 已提交
2432
 *	PCI/etc. bus probe sem.
2433 2434 2435
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2436
 */
2437
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2438
{
2439
	struct ata_device *dev;
2440
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2441

2442
	/* has private set_mode? */
A
Alan 已提交
2443 2444
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2445

2446 2447
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2448
		unsigned int pio_mask, dma_mask;
2449

2450 2451
		dev = &ap->device[i];

2452
		if (!ata_dev_enabled(dev))
2453 2454
			continue;

T
Tejun Heo 已提交
2455
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2456

2457 2458 2459 2460
		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);
2461

2462
		found = 1;
2463 2464
		if (dev->dma_mode)
			used_dma = 1;
2465
	}
2466
	if (!found)
2467
		goto out;
2468 2469

	/* step 2: always set host PIO timings */
2470 2471 2472 2473 2474 2475
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2476
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2477
			rc = -EINVAL;
2478
			goto out;
2479 2480 2481 2482 2483 2484 2485
		}

		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
2486

2487
	/* step 3: set host DMA timings */
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
	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
2499 2500

	/* step 4: update devices' xfer mode */
2501
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2502
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2503

A
Alan 已提交
2504
		/* don't update suspended devices' xfer mode */
2505
		if (!ata_dev_ready(dev))
2506 2507
			continue;

T
Tejun Heo 已提交
2508
		rc = ata_dev_set_mode(dev);
2509
		if (rc)
2510
			goto out;
2511
	}
L
Linus Torvalds 已提交
2512

2513 2514
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2515
	 */
J
Jeff Garzik 已提交
2516 2517
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
		ap->host->simplex_claimed = 1;
2518

2519
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2520 2521 2522
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

2523 2524 2525 2526
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2527 2528
}

2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
/**
 *	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
2539
 *	spin_lock_irqsave(host lock)
2540 2541 2542 2543 2544 2545 2546 2547 2548
 */

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
2549 2550 2551 2552 2553 2554
/**
 *	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
2555 2556 2557
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2558 2559 2560 2561 2562
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2563
 */
2564 2565
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2566 2567 2568 2569 2570 2571 2572
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2573 2574
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2575 2576 2577 2578
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2579
	if (status != 0xff && (status & ATA_BUSY))
2580
		ata_port_printk(ap, KERN_WARNING,
2581 2582
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2583 2584

	timeout = timer_start + tmout;
2585 2586
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2587 2588 2589 2590
		msleep(50);
		status = ata_chk_status(ap);
	}

2591 2592 2593
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2594
	if (status & ATA_BUSY) {
2595
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2596 2597
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2598
		return -EBUSY;
L
Linus Torvalds 已提交
2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
	}

	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
2625 2626
		nsect = ioread8(ioaddr->nsect_addr);
		lbal = ioread8(ioaddr->lbal_addr);
L
Linus Torvalds 已提交
2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

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

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

T
Tejun Heo 已提交
2651
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
2652 2653

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
2654 2655 2656 2657 2658
	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
2659 2660 2661 2662 2663 2664 2665 2666

	/* 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.
2667 2668
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2669 2670 2671
	 */
	msleep(150);

2672
	/* Before we perform post reset processing we want to see if
2673 2674 2675
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2676 2677
	if (ata_check_status(ap) == 0xFF)
		return 0;
2678

L
Linus Torvalds 已提交
2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696
	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
2697
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2698
 *	Obtains host lock.
L
Linus Torvalds 已提交
2699 2700
 *
 *	SIDE EFFECTS:
2701
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2702 2703 2704 2705 2706 2707 2708
 */

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
2709
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2710

T
Tejun Heo 已提交
2711
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731

	/* 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
2732 2733
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2734 2735 2736 2737

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2738
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2739
	if ((slave_possible) && (err != 0x81))
2740
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2741 2742

	/* re-enable interrupts */
2743
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757

	/* 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
2758
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
2759 2760 2761 2762 2763 2764
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2765
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2766 2767 2768 2769 2770
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789
/**
 *	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)
2790
{
2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
	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;
2846 2847 2848 2849
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2850

2851
	scontrol = (scontrol & 0x0f0) | 0x300;
2852 2853 2854

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2855

2856 2857 2858 2859
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2860

2861
	return sata_phy_debounce(ap, params);
2862 2863
}

2864 2865 2866 2867 2868 2869 2870 2871
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) {
2872
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2873 2874 2875 2876 2877 2878 2879 2880 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 2906 2907

		/* 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;
2908
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2909 2910
	int rc;

2911 2912 2913 2914 2915 2916 2917 2918
	/* 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);
2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943

	/* 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;
}

2944 2945 2946 2947 2948
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2949
 *	Reset host port using ATA SRST.
2950 2951 2952 2953 2954 2955 2956
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2957
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2958 2959 2960 2961 2962 2963 2964
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

2965
	if (ata_port_offline(ap)) {
2966 2967 2968 2969
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982
	/* 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) {
2983 2984
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
2985 2986 2987 2988 2989 2990 2991 2992
		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);

2993
 out:
2994 2995 2996 2997 2998
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
2999
 *	sata_port_hardreset - reset port via SATA phy reset
3000
 *	@ap: port to reset
3001
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3002 3003 3004 3005 3006 3007 3008 3009 3010
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3011
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3012
{
3013
	u32 scontrol;
3014
	int rc;
3015

3016 3017
	DPRINTK("ENTER\n");

3018
	if (sata_set_spd_needed(ap)) {
3019 3020 3021 3022 3023
		/* 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.
		 */
3024
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3025
			goto out;
3026

3027
		scontrol = (scontrol & 0x0f0) | 0x304;
3028 3029

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3030
			goto out;
3031

3032
		sata_set_spd(ap);
3033 3034 3035
	}

	/* issue phy wake/reset */
3036
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3037
		goto out;
3038

3039
	scontrol = (scontrol & 0x0f0) | 0x301;
3040 3041

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3042
		goto out;
3043

3044
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3045 3046 3047 3048
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3049
	/* bring phy back */
3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083
	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;
	}
3084 3085

	/* TODO: phy layer with polling, timeouts, etc. */
3086
	if (ata_port_offline(ap)) {
3087 3088 3089 3090 3091
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3092 3093 3094
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3095
	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3096 3097
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3098 3099 3100
		return -EIO;
	}

3101 3102
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122
	*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)
{
3123 3124
	u32 serror;

3125 3126 3127
	DPRINTK("ENTER\n");

	/* print link status */
3128
	sata_print_link_status(ap);
3129

3130 3131 3132 3133
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3134
	/* re-enable interrupts */
3135 3136
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3137 3138 3139 3140 3141 3142 3143

	/* 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);

3144 3145 3146 3147 3148 3149 3150
	/* 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
3151 3152
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3153 3154 3155 3156

	DPRINTK("EXIT\n");
}

3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172
/**
 *	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
3173 3174
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3175 3176
{
	const u16 *old_id = dev->id;
3177 3178
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3179 3180 3181
	u64 new_n_sectors;

	if (dev->class != new_class) {
3182 3183
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3184 3185 3186
		return 0;
	}

3187 3188 3189 3190
	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]));
3191 3192 3193
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3194 3195
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3196 3197 3198 3199
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3200 3201
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3202 3203 3204 3205
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3206 3207 3208 3209
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3210 3211 3212 3213 3214 3215 3216 3217 3218
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3219
 *	@readid_flags: read ID flags
3220 3221 3222 3223 3224 3225 3226 3227 3228 3229
 *
 *	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
 */
3230
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3231
{
3232
	unsigned int class = dev->class;
3233
	u16 *id = (void *)dev->ap->sector_buf;
3234 3235
	int rc;

3236 3237 3238 3239
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3240

3241
	/* read ID data */
3242
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3243 3244 3245 3246
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3247
	if (!ata_dev_same_device(dev, class, id)) {
3248 3249 3250 3251
		rc = -ENODEV;
		goto fail;
	}

3252
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3253 3254

	/* configure device according to the new ID */
3255
	rc = ata_dev_configure(dev);
3256 3257
	if (rc == 0)
		return 0;
3258 3259

 fail:
3260
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3261 3262 3263
	return rc;
}

3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

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

	/* Devices we expect to fail diagnostics */

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

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3312
};
3313

3314
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3315
{
T
Tejun Heo 已提交
3316 3317
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3318
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3319

T
Tejun Heo 已提交
3320 3321
	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
3322

3323
	while (ad->model_num) {
T
Tejun Heo 已提交
3324
		if (!strcmp(ad->model_num, model_num)) {
3325 3326
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3327
			if (!strcmp(ad->model_rev, model_rev))
3328
				return ad->horkage;
3329
		}
3330
		ad++;
3331
	}
L
Linus Torvalds 已提交
3332 3333 3334
	return 0;
}

3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346
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;
}

3347 3348 3349 3350
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3351 3352 3353 3354
 *	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...
3355 3356 3357 3358
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3359
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3360
{
T
Tejun Heo 已提交
3361
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3362
	struct ata_host *host = ap->host;
3363
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3364

3365
	/* controller modes available */
3366 3367 3368 3369 3370 3371 3372 3373
	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);
3374 3375 3376 3377 3378 3379 3380
	/* 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
3381

3382 3383 3384
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3385

3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396
	/*
	 *	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));
	}

3397 3398
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3399 3400
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3401
	}
3402

J
Jeff Garzik 已提交
3403
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
3404 3405 3406
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3407
	}
3408

3409 3410 3411
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3412 3413
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3414 3415 3416 3417 3418 3419
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3420 3421 3422
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3423
 *	LOCKING:
J
Jeff Garzik 已提交
3424
 *	PCI/etc. bus probe sem.
3425 3426 3427
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3428 3429
 */

T
Tejun Heo 已提交
3430
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3431
{
3432
	struct ata_taskfile tf;
3433
	unsigned int err_mask;
L
Linus Torvalds 已提交
3434 3435 3436 3437

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

T
Tejun Heo 已提交
3438
	ata_tf_init(dev, &tf);
3439 3440 3441 3442 3443
	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
3444

T
Tejun Heo 已提交
3445
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3446

3447 3448
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3449 3450
}

3451 3452 3453
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3454 3455
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3456 3457
 *
 *	LOCKING:
3458 3459 3460 3461
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3462
 */
T
Tejun Heo 已提交
3463 3464
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3465
{
3466
	struct ata_taskfile tf;
3467
	unsigned int err_mask;
3468 3469 3470

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3471
		return AC_ERR_INVALID;
3472 3473 3474 3475

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

T
Tejun Heo 已提交
3476
	ata_tf_init(dev, &tf);
3477 3478 3479 3480 3481
	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 */
3482

T
Tejun Heo 已提交
3483
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3484

3485 3486
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3487 3488
}

L
Linus Torvalds 已提交
3489
/**
J
Jeff Garzik 已提交
3490 3491 3492 3493
 *	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
3494 3495
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3496
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3497
 */
3498
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3499 3500
{
	struct ata_port *ap = qc->ap;
3501
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3502
	int dir = qc->dma_dir;
3503
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3504

3505 3506
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3507 3508

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3509
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3510

J
Jeff Garzik 已提交
3511
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3512

3513 3514 3515 3516 3517 3518 3519 3520
	/* 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) {
3521
		if (qc->n_elem)
3522
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3523 3524 3525 3526 3527 3528
		/* 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);
3529
			kunmap_atomic(addr, KM_IRQ0);
3530 3531
		}
	} else {
3532
		if (qc->n_elem)
3533
			dma_unmap_single(ap->dev,
3534 3535
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3536 3537 3538 3539 3540 3541
		/* 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
3542 3543

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3544
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3545 3546 3547 3548 3549 3550
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3551 3552 3553
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3554
 *	LOCKING:
J
Jeff Garzik 已提交
3555
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3556 3557 3558 3559 3560
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3561 3562
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3563

3564
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3565
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3566 3567

	idx = 0;
3568
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601
		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
3602 3603 3604 3605
 *	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
3606
 *	LOCKING:
J
Jeff Garzik 已提交
3607
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3608
 *
L
Linus Torvalds 已提交
3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625
 *	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
3626 3627
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3628
 *	LOCKING:
J
Jeff Garzik 已提交
3629
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3630 3631 3632 3633 3634 3635 3636 3637 3638
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3639 3640
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3641 3642 3643 3644 3645 3646 3647 3648 3649 3650
/**
 *	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
3651
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3652 3653
 */

L
Linus Torvalds 已提交
3654 3655 3656 3657
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3658
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3659
	qc->n_elem = 1;
3660
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3661
	qc->buf_virt = buf;
3662
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3663

3664
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3665 3666
}

J
Jeff Garzik 已提交
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677
/**
 *	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
3678
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3679 3680
 */

L
Linus Torvalds 已提交
3681 3682 3683 3684
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3685
	qc->__sg = sg;
L
Linus Torvalds 已提交
3686
	qc->n_elem = n_elem;
3687
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3688 3689 3690
}

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

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3707
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3708
	dma_addr_t dma_address;
3709
	int trim_sg = 0;
L
Linus Torvalds 已提交
3710

3711 3712 3713 3714 3715 3716
	/* 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;

3717
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728

		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;
3729 3730
		if (sg->length == 0)
			trim_sg = 1;
3731 3732 3733 3734 3735

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

3736 3737
	if (trim_sg) {
		qc->n_elem--;
3738 3739 3740
		goto skip_map;
	}

3741
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3742
				     sg->length, dir);
3743 3744 3745
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3746
		return -1;
3747
	}
L
Linus Torvalds 已提交
3748 3749

	sg_dma_address(sg) = dma_address;
3750
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3751

3752
skip_map:
L
Linus Torvalds 已提交
3753 3754 3755 3756 3757 3758 3759
	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
3760 3761 3762 3763
 *	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
3764 3765
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3766
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3767 3768
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3769
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3770 3771 3772 3773 3774 3775
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3776 3777
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3778
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3779

T
Tejun Heo 已提交
3780
	VPRINTK("ENTER, ata%u\n", ap->print_id);
3781
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3782

3783 3784 3785 3786 3787 3788 3789
	/* 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;

3790
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804

		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);
3805
			kunmap_atomic(addr, KM_IRQ0);
3806 3807 3808 3809 3810 3811
		}

		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;
3812 3813
		if (lsg->length == 0)
			trim_sg = 1;
3814 3815 3816 3817 3818

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

3819 3820 3821 3822 3823 3824 3825 3826 3827
	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
3828
	dir = qc->dma_dir;
3829
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3830 3831 3832
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3833
		return -1;
3834
	}
L
Linus Torvalds 已提交
3835 3836 3837

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

3838
skip_map:
L
Linus Torvalds 已提交
3839 3840 3841 3842 3843
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3844
/**
3845
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3846 3847 3848 3849 3850 3851 3852 3853
 *	@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
3854
 *	Inherited from caller.
E
Edward Falk 已提交
3855
 */
L
Linus Torvalds 已提交
3856 3857 3858 3859 3860 3861 3862 3863 3864 3865
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
3866
/**
T
Tejun Heo 已提交
3867
 *	ata_data_xfer - Transfer data by PIO
3868
 *	@adev: device to target
A
Albert Lee 已提交
3869 3870
 *	@buf: data buffer
 *	@buflen: buffer length
3871
 *	@write_data: read/write
A
Albert Lee 已提交
3872 3873 3874 3875 3876 3877
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3878 3879
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3880
{
3881
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3882
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3883

A
Albert Lee 已提交
3884
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3885
	if (write_data)
T
Tejun Heo 已提交
3886
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3887
	else
T
Tejun Heo 已提交
3888
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
3889 3890 3891 3892 3893 3894 3895 3896

	/* 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
3897
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
3898
		} else {
T
Tejun Heo 已提交
3899
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
3900 3901 3902
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3903 3904
}

3905
/**
T
Tejun Heo 已提交
3906
 *	ata_data_xfer_noirq - Transfer data by PIO
3907 3908 3909 3910 3911
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3912
 *	Transfer data from/to the device data register by PIO. Do the
3913 3914 3915 3916 3917
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
3918 3919
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
3920 3921 3922
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
3923
	ata_data_xfer(adev, buf, buflen, write_data);
3924 3925 3926 3927
	local_irq_restore(flags);
}


A
Albert Lee 已提交
3928 3929 3930 3931 3932 3933 3934 3935 3936 3937
/**
 *	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
3938 3939 3940
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
3941
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3942 3943 3944 3945 3946
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

T
Tejun Heo 已提交
3947
	if (qc->curbytes == qc->nbytes - ATA_SECT_SIZE)
A
Albert Lee 已提交
3948
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
3949 3950

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
3951
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
3952 3953 3954 3955 3956 3957 3958

	/* 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");

3959 3960 3961
	if (PageHighMem(page)) {
		unsigned long flags;

3962
		/* FIXME: use a bounce buffer */
3963 3964
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
3965

3966
		/* do the actual data transfer */
3967
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
3968

3969 3970 3971 3972
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
3973
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
3974
	}
L
Linus Torvalds 已提交
3975

T
Tejun Heo 已提交
3976 3977
	qc->curbytes += ATA_SECT_SIZE;
	qc->cursg_ofs += ATA_SECT_SIZE;
L
Linus Torvalds 已提交
3978

T
Tejun Heo 已提交
3979
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
3980 3981 3982 3983 3984
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

3985 3986 3987 3988
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
3989
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
3990 3991 3992 3993 3994
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
3995

3996 3997 3998 3999 4000 4001
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
4002
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4003

T
Tejun Heo 已提交
4004 4005
		nsect = min((qc->nbytes - qc->curbytes) / ATA_SECT_SIZE,
			    qc->dev->multi_count);
4006 4007 4008 4009 4010 4011
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027
/**
 *	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");
4028
	WARN_ON(qc->dev->cdb_len < 12);
4029

4030
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045
	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
4046 4047
}

A
Albert Lee 已提交
4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059
/**
 *	__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
4060 4061 4062
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4063
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4064 4065 4066 4067 4068
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4069
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4070
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4071 4072

next_sg:
4073
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4074
		/*
4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085
		 * 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 */
4086 4087
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4088 4089

		for (i = 0; i < words; i++)
4090
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4091

A
Albert Lee 已提交
4092
		ap->hsm_task_state = HSM_ST_LAST;
4093 4094 4095
		return;
	}

4096
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4097 4098 4099 4100 4101 4102 4103 4104

	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;

4105
	/* don't overrun current sg */
4106
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4107 4108 4109 4110

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

4111 4112
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4113 4114 4115
	if (PageHighMem(page)) {
		unsigned long flags;

4116
		/* FIXME: use bounce buffer */
4117 4118
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4119

4120
		/* do the actual data transfer */
4121
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4122

4123 4124 4125 4126
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4127
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4128
	}
L
Linus Torvalds 已提交
4129 4130 4131 4132 4133

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

4134
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4135 4136 4137 4138
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4139
	if (bytes)
L
Linus Torvalds 已提交
4140 4141 4142
		goto next_sg;
}

A
Albert Lee 已提交
4143 4144 4145 4146 4147 4148 4149 4150 4151 4152
/**
 *	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
4153 4154 4155 4156 4157 4158 4159
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;

4160 4161 4162 4163 4164 4165 4166 4167 4168 4169
	/* 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
4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180
	bytes = (bc_hi << 8) | bc_lo;

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

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

T
Tejun Heo 已提交
4181
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4182

L
Linus Torvalds 已提交
4183 4184 4185 4186 4187
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4188
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4189
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4190
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4191 4192 4193
}

/**
4194 4195 4196
 *	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
4197
 *
4198 4199
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4200
 */
4201 4202

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4203
{
4204 4205
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4206

4207 4208 4209 4210
	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
4211

4212 4213 4214
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4215 4216
	}

4217 4218
	return 0;
}
L
Linus Torvalds 已提交
4219

T
Tejun Heo 已提交
4220 4221 4222 4223 4224 4225 4226 4227
/**
 *	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
4228
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4229 4230 4231 4232 4233 4234 4235 4236 4237
 *	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) {
4238
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4239

J
Jeff Garzik 已提交
4240 4241
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4242 4243 4244 4245
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4246
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4247 4248 4249 4250 4251
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4252
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4253 4254 4255 4256 4257 4258 4259 4260
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4261
			spin_lock_irqsave(ap->lock, flags);
4262
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4263
			ata_qc_complete(qc);
4264
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4265 4266 4267
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4268

4269
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4270 4271
}

4272 4273 4274 4275 4276 4277 4278 4279 4280 4281
/**
 *	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.
 */
4282 4283
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4284
{
4285 4286 4287
	unsigned long flags = 0;
	int poll_next;

4288 4289
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4290 4291 4292 4293
	/* 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).
	 */
4294
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4295

4296
fsm_start:
4297
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4298
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4299

4300 4301
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4302 4303 4304 4305 4306 4307 4308 4309
		/* 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);

4310
		/* check device status */
4311 4312 4313 4314 4315 4316 4317 4318 4319
		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
4320
			ap->hsm_task_state = HSM_ST_ERR;
4321
			goto fsm_start;
L
Linus Torvalds 已提交
4322 4323
		}

4324 4325
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4326 4327 4328
		 * 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.
4329 4330
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4331 4332
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4333
			qc->err_mask |= AC_ERR_HSM;
4334 4335
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4336
		}
L
Linus Torvalds 已提交
4337

4338 4339 4340 4341 4342 4343
		/* 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)
4344
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4345

4346 4347 4348 4349
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4350

4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362
			/* 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)
4363
			spin_unlock_irqrestore(ap->lock, flags);
4364 4365 4366 4367

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4368
		break;
4369

4370 4371 4372 4373 4374
	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) {
4375 4376 4377
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4378 4379 4380
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4381

4382 4383
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4384 4385 4386
			 * 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.
4387 4388
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4389 4390 4391
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4392
				qc->err_mask |= AC_ERR_HSM;
4393 4394
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4395
			}
L
Linus Torvalds 已提交
4396

4397
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4398

4399 4400 4401
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4402

4403 4404 4405 4406
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4407 4408 4409 4410
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4411 4412 4413 4414 4415 4416
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4417

4418 4419 4420
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4421

4422 4423 4424 4425 4426 4427 4428 4429 4430
			/* 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.
4431 4432 4433 4434
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4435 4436 4437 4438 4439 4440 4441

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

4442 4443 4444
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4445 4446 4447 4448 4449 4450
				/* 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;
4451 4452
			}

4453 4454 4455 4456 4457 4458
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4459
				status = ata_wait_idle(ap);
4460 4461 4462 4463 4464
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4465
		poll_next = 1;
L
Linus Torvalds 已提交
4466 4467
		break;

A
Albert Lee 已提交
4468
	case HSM_ST_LAST:
4469 4470
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4471 4472 4473 4474 4475
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4476
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
4477
			ap->print_id, qc->dev->devno, status);
4478

4479 4480
		WARN_ON(qc->err_mask);

4481
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4482

4483
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4484
		ata_hsm_qc_complete(qc, in_wq);
4485 4486

		poll_next = 0;
L
Linus Torvalds 已提交
4487 4488
		break;

A
Albert Lee 已提交
4489
	case HSM_ST_ERR:
4490 4491 4492 4493 4494 4495
		/* 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;
4496

4497
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4498
		ata_hsm_qc_complete(qc, in_wq);
4499 4500

		poll_next = 0;
4501 4502
		break;
	default:
4503
		poll_next = 0;
4504
		BUG();
L
Linus Torvalds 已提交
4505 4506
	}

4507
	return poll_next;
L
Linus Torvalds 已提交
4508 4509
}

4510
static void ata_pio_task(struct work_struct *work)
4511
{
4512 4513 4514
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4515
	u8 status;
4516
	int poll_next;
4517

J
Jeff Garzik 已提交
4518
fsm_start:
4519
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4520

4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532
	/*
	 * 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) {
4533
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4534 4535
			return;
		}
4536 4537
	}

4538 4539
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4540

4541 4542 4543 4544
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4545
		goto fsm_start;
4546 4547
}

L
Linus Torvalds 已提交
4548 4549 4550 4551 4552 4553
/**
 *	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
4554
 *	None.
L
Linus Torvalds 已提交
4555 4556 4557 4558 4559 4560 4561
 */

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

4562
	/* no command while frozen */
4563
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4564 4565
		return NULL;

4566 4567
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4568
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4569
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583
			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
4584
 *	None.
L
Linus Torvalds 已提交
4585 4586
 */

T
Tejun Heo 已提交
4587
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4588
{
T
Tejun Heo 已提交
4589
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4590 4591 4592 4593 4594 4595 4596 4597
	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
4598
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611
	}

	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
4612
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4613 4614 4615
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4616 4617 4618
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4619
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4620

4621 4622 4623 4624
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4625
		clear_bit(tag, &ap->qc_allocated);
4626
	}
L
Linus Torvalds 已提交
4627 4628
}

4629
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4630
{
4631 4632
	struct ata_port *ap = qc->ap;

4633 4634
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4635 4636 4637 4638

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

4639
	/* command should be marked inactive atomically with qc completion */
4640 4641 4642 4643
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4644

4645 4646 4647 4648 4649
	/* 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;
4650
	ap->qc_active &= ~(1 << qc->tag);
4651

L
Linus Torvalds 已提交
4652
	/* call completion callback */
4653
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4654 4655
}

4656 4657 4658 4659 4660 4661 4662 4663
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;
}

4664 4665 4666 4667 4668 4669 4670 4671 4672
/**
 *	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
4673
 *	spin_lock_irqsave(host lock)
4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692
 */
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) {
4693
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4694 4695 4696 4697 4698 4699 4700

		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 */
4701
				fill_result_tf(qc);
4702 4703 4704 4705 4706 4707 4708
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4709
			fill_result_tf(qc);
4710 4711 4712 4713 4714 4715 4716 4717

		__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)
4718
			fill_result_tf(qc);
4719 4720 4721 4722 4723

		__ata_qc_complete(qc);
	}
}

4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735
/**
 *	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
4736
 *	spin_lock_irqsave(host lock)
4737 4738 4739 4740 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 4769 4770 4771 4772
 *
 *	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
4773 4774 4775 4776 4777
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4778
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806
	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
4807
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4808
 */
4809
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4810 4811 4812
{
	struct ata_port *ap = qc->ap;

4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826
	/* 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;
	}

4827
	qc->flags |= ATA_QCFLAG_ACTIVE;
4828
	ap->qc_active |= 1 << qc->tag;
4829

L
Linus Torvalds 已提交
4830 4831 4832
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4833
				goto sg_err;
L
Linus Torvalds 已提交
4834 4835
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4836
				goto sg_err;
L
Linus Torvalds 已提交
4837 4838 4839 4840 4841 4842 4843
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4844 4845 4846 4847
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4848

4849 4850
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4851 4852 4853
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864
}

/**
 *	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
4865 4866
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4867
 *	LOCKING:
J
Jeff Garzik 已提交
4868
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4869 4870
 *
 *	RETURNS:
4871
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4872 4873
 */

4874
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4875 4876 4877
{
	struct ata_port *ap = qc->ap;

4878 4879 4880 4881 4882 4883
	/* 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:
4884
		case ATA_PROT_NODATA:
4885 4886 4887 4888 4889 4890
		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)
4891
				/* see ata_dma_blacklisted() */
4892 4893 4894 4895 4896 4897 4898
				BUG();
			break;
		default:
			break;
		}
	}

4899 4900 4901 4902 4903 4904 4905 4906
	/* 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;

4907
	/* select the device */
L
Linus Torvalds 已提交
4908 4909
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4910
	/* start the command */
L
Linus Torvalds 已提交
4911 4912
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4913 4914 4915
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4916
		ata_tf_to_host(ap, &qc->tf);
4917 4918 4919
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
4920
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4921

L
Linus Torvalds 已提交
4922 4923 4924
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
4925
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4926

L
Linus Torvalds 已提交
4927 4928 4929
		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 */
4930
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4931 4932
		break;

4933 4934 4935
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
4936

J
Jeff Garzik 已提交
4937
		ata_tf_to_host(ap, &qc->tf);
4938

4939 4940 4941
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
4942
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4943 4944

			/* always send first data block using
4945
			 * the ata_pio_task() codepath.
4946
			 */
4947
		} else {
4948 4949 4950 4951
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
4952
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
4953 4954 4955 4956

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
4957 4958
		}

L
Linus Torvalds 已提交
4959 4960 4961 4962
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
4963 4964 4965
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4966
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
4967

4968 4969 4970 4971 4972
		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))
4973
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
4974 4975 4976
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
4977
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
4978

L
Linus Torvalds 已提交
4979 4980
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
4981 4982 4983 4984
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
4985
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
4986 4987 4988 4989
		break;

	default:
		WARN_ON(1);
4990
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005
	}

	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
5006
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5007 5008 5009 5010 5011 5012 5013 5014
 *
 *	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)
{
5015
	struct ata_eh_info *ehi = &ap->eh_info;
5016
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5017

5018
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5019
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5020

5021 5022 5023
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5024 5025 5026
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5027

5028 5029 5030 5031 5032
		/* 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
5033 5034
			goto idle_irq;
		break;
5035 5036 5037 5038 5039
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
5040 5041
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5042 5043 5044 5045 5046 5047 5048

			/* 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);
5049 5050 5051 5052 5053 5054

			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;
			}
5055 5056 5057 5058
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5059 5060 5061 5062
	default:
		goto idle_irq;
	}

5063 5064 5065 5066
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5067

5068 5069 5070 5071
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5072

5073 5074
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5075

5076
	ata_hsm_move(ap, qc, status, 0);
5077 5078 5079 5080 5081

	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
5082 5083 5084 5085 5086 5087 5088
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5089
		ap->ops->irq_ack(ap, 0); /* debug trap */
5090
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5091
		return 1;
L
Linus Torvalds 已提交
5092 5093 5094 5095 5096 5097 5098
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5099
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5100
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5101
 *
J
Jeff Garzik 已提交
5102 5103 5104
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5105
 *	LOCKING:
J
Jeff Garzik 已提交
5106
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5107 5108
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5109
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5110 5111
 */

5112
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5113
{
J
Jeff Garzik 已提交
5114
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5115 5116 5117 5118 5119
	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
5120
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5121

J
Jeff Garzik 已提交
5122
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5123 5124
		struct ata_port *ap;

J
Jeff Garzik 已提交
5125
		ap = host->ports[i];
5126
		if (ap &&
J
Jeff Garzik 已提交
5127
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5128 5129 5130
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5131
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5132
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5133 5134 5135 5136
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5137
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5138 5139 5140 5141

	return IRQ_RETVAL(handled);
}

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 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278
/**
 *	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
5279

5280
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5281
{
5282
	unsigned int err_mask;
J
Jens Axboe 已提交
5283 5284 5285 5286 5287
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5288
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5289 5290 5291 5292
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5293 5294 5295 5296 5297 5298 5299
	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
5300 5301
}

J
Jeff Garzik 已提交
5302 5303 5304
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5305 5306 5307 5308
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5309 5310
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349

		/* 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
5350 5351
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5352 5353
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5354
 *	Suspend @host.  Actual operation is performed by EH.  This
5355 5356 5357 5358 5359 5360 5361 5362 5363
 *	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
5364
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5365 5366 5367
{
	int i, j, rc;

J
Jeff Garzik 已提交
5368
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5369 5370 5371 5372 5373 5374 5375
	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
5376 5377
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391

		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
5392
	host->dev->power.power_state = mesg;
5393 5394 5395
	return 0;

 fail:
J
Jeff Garzik 已提交
5396
	ata_host_resume(host);
5397 5398 5399 5400
	return rc;
}

/**
J
Jeff Garzik 已提交
5401 5402
 *	ata_host_resume - resume host
 *	@host: host to resume
5403
 *
J
Jeff Garzik 已提交
5404
 *	Resume @host.  Actual operation is performed by EH.  This
5405 5406 5407 5408 5409 5410
 *	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
5411
void ata_host_resume(struct ata_host *host)
5412
{
J
Jeff Garzik 已提交
5413 5414 5415
	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;
5416 5417
}

5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429
/**
 *	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.
 */
5430
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5431
{
5432
	struct device *dev = ap->dev;
5433
	int rc;
L
Linus Torvalds 已提交
5434

5435 5436
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5437 5438 5439
	if (!ap->prd)
		return -ENOMEM;

5440
	rc = ata_pad_alloc(ap, dev);
5441
	if (rc)
5442
		return rc;
L
Linus Torvalds 已提交
5443

5444 5445
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5446 5447 5448
	return 0;
}

5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460
/**
 *	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;
5461 5462
	unsigned long flags;

5463 5464 5465
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5466 5467
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5468
	 * host lock.
5469
	 */
5470
	spin_lock_irqsave(ap->lock, flags);
5471
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5472
	spin_unlock_irqrestore(ap->lock, flags);
5473

5474 5475
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5476 5477 5478 5479 5480
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5481
/**
B
Brian King 已提交
5482
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5483
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5484
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5485 5486 5487
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5488
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5489
 *
L
Linus Torvalds 已提交
5490
 *	LOCKING:
J
Jeff Garzik 已提交
5491
 *	Inherited from caller.
L
Linus Torvalds 已提交
5492
 */
J
Jeff Garzik 已提交
5493
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5494
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5495 5496 5497
{
	unsigned int i;

J
Jeff Garzik 已提交
5498
	ap->lock = &host->lock;
5499
	ap->flags = ATA_FLAG_DISABLED;
T
Tejun Heo 已提交
5500
	ap->print_id = ata_print_id++;
L
Linus Torvalds 已提交
5501
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5502
	ap->host = host;
5503
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5504
	ap->port_no = port_no;
5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517
	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;
	}
5518
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5519 5520
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5521 5522 5523 5524 5525 5526

#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
5527
#else
5528
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5529
#endif
L
Linus Torvalds 已提交
5530

5531 5532 5533
	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);
5534
	INIT_LIST_HEAD(&ap->eh_done_q);
5535
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5536

5537 5538 5539 5540 5541
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5542 5543
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5544
		dev->ap = ap;
5545
		dev->devno = i;
5546
		ata_dev_init(dev);
5547
	}
L
Linus Torvalds 已提交
5548 5549 5550 5551 5552 5553 5554 5555 5556

#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
5557
/**
5558 5559 5560
 *	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
5561
 *
5562
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5563 5564 5565 5566
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5567
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5568
{
J
Jeff Garzik 已提交
5569
	ap->scsi_host = shost;
B
Brian King 已提交
5570

T
Tejun Heo 已提交
5571
	shost->unique_id = ap->print_id;
5572 5573 5574 5575
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5576 5577
}

L
Linus Torvalds 已提交
5578
/**
5579
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5580
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5581
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5582 5583
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5584 5585
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5586
 *	LOCKING:
J
Jeff Garzik 已提交
5587
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5588 5589
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5590
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5591
 */
5592
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5593
				      struct ata_host *host,
L
Linus Torvalds 已提交
5594 5595
				      unsigned int port_no)
{
5596
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5597 5598 5599
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5600

5601
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5602
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5603 5604 5605 5606 5607
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5608 5609
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5610 5611
		return NULL;

5612
	shost->transportt = &ata_scsi_transport_template;
5613

5614
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5615

J
Jeff Garzik 已提交
5616
	ata_port_init(ap, host, ent, port_no);
5617
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5618 5619 5620 5621

	return ap;
}

5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642
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);
}

5643
/**
J
Jeff Garzik 已提交
5644 5645 5646 5647 5648
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5649 5650 5651 5652 5653 5654
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5655 5656
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5657
{
J
Jeff Garzik 已提交
5658 5659 5660 5661
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5662 5663
}

L
Linus Torvalds 已提交
5664
/**
J
Jeff Garzik 已提交
5665 5666 5667 5668 5669 5670 5671 5672 5673 5674
 *	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
5675 5676
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5677
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5678 5679
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5680
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5681
 */
J
Jeff Garzik 已提交
5682
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5683
{
5684
	unsigned int i;
L
Linus Torvalds 已提交
5685
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5686
	struct ata_host *host;
5687
	int rc;
L
Linus Torvalds 已提交
5688 5689

	DPRINTK("ENTER\n");
J
Jeff Garzik 已提交
5690

5691 5692 5693 5694
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
5695 5696 5697 5698

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

L
Linus Torvalds 已提交
5699
	/* alloc a container for our list of ATA ports (buses) */
5700 5701
	host = devres_alloc(ata_host_release, sizeof(struct ata_host) +
			    (ent->n_ports * sizeof(void *)), GFP_KERNEL);
J
Jeff Garzik 已提交
5702
	if (!host)
5703 5704 5705
		goto err_out;
	devres_add(dev, host);
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5706

J
Jeff Garzik 已提交
5707 5708 5709 5710
	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
5711
	host->iomap = ent->iomap;
J
Jeff Garzik 已提交
5712
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5713 5714

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5715
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5716 5717
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5718
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5719

J
Jeff Garzik 已提交
5720
		ap = ata_port_add(ent, host, i);
5721
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5722 5723 5724
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5725 5726 5727 5728 5729 5730 5731 5732 5733 5734
		/* 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
5735 5736
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5737 5738 5739
			goto err_out;
		}

5740 5741 5742 5743
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5744 5745 5746 5747 5748
		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
5749 5750
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
				"ctl 0x%p bmdma 0x%p irq %d\n",
5751 5752 5753 5754 5755
				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,
5756
				irq_line);
L
Linus Torvalds 已提交
5757

5758 5759
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5760 5761
	}

5762
	/* obtain irq, that may be shared between channels */
5763 5764
	rc = devm_request_irq(dev, ent->irq, ent->port_ops->irq_handler,
			      ent->irq_flags, DRV_NAME, host);
5765 5766 5767
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5768
		goto err_out;
5769
	}
L
Linus Torvalds 已提交
5770

5771 5772 5773 5774 5775 5776
	/* 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);

5777 5778 5779
		rc = devm_request_irq(dev, ent->irq2,
				ent->port_ops->irq_handler, ent->irq_flags,
				DRV_NAME, host);
5780 5781 5782
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
5783
			goto err_out;
5784 5785 5786
		}
	}

5787
	/* resource acquisition complete */
T
Tejun Heo 已提交
5788
	devres_remove_group(dev, ata_device_add);
5789

L
Linus Torvalds 已提交
5790 5791
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5792 5793
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5794
		u32 scontrol;
L
Linus Torvalds 已提交
5795 5796
		int rc;

5797 5798 5799 5800 5801 5802 5803
		/* 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
5804
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5805
		if (rc) {
5806
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5807 5808 5809 5810 5811 5812
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5813

5814
		if (ap->ops->error_handler) {
5815
			struct ata_eh_info *ehi = &ap->eh_info;
5816 5817 5818 5819 5820
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5821
			spin_lock_irqsave(ap->lock, flags);
5822

5823 5824 5825
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5826

5827
			ap->pflags |= ATA_PFLAG_LOADING;
5828 5829
			ata_port_schedule_eh(ap);

5830
			spin_unlock_irqrestore(ap->lock, flags);
5831 5832 5833 5834

			/* wait for EH to finish */
			ata_port_wait_eh(ap);
		} else {
T
Tejun Heo 已提交
5835
			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
5836
			rc = ata_bus_probe(ap);
T
Tejun Heo 已提交
5837
			DPRINTK("ata%u: bus probe end\n", ap->print_id);
5838 5839 5840 5841 5842 5843 5844 5845 5846 5847

			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
5848 5849 5850
	}

	/* probes are done, now scan each port's disk(s) */
5851
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5852 5853
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5854

J
Jeff Garzik 已提交
5855
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5856 5857 5858 5859 5860
	}

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

5861 5862 5863 5864
 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
5865 5866 5867
	return 0;
}

5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884
/**
 *	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)
5885
		goto skip_eh;
5886 5887

	/* tell EH we're leaving & flush EH */
5888
	spin_lock_irqsave(ap->lock, flags);
5889
	ap->pflags |= ATA_PFLAG_UNLOADING;
5890
	spin_unlock_irqrestore(ap->lock, flags);
5891 5892 5893 5894 5895 5896

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5897
	spin_lock_irqsave(ap->lock, flags);
5898 5899 5900 5901

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

5902
	spin_unlock_irqrestore(ap->lock, flags);
5903 5904 5905 5906 5907

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5908
	spin_lock_irqsave(ap->lock, flags);
5909
	ata_port_freeze(ap);	/* won't be thawed */
5910
	spin_unlock_irqrestore(ap->lock, flags);
5911 5912 5913 5914 5915 5916 5917 5918 5919 5920

	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);

5921
 skip_eh:
5922
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
5923
	scsi_remove_host(ap->scsi_host);
5924 5925
}

T
Tejun Heo 已提交
5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942
/**
 *	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]);
}

5943 5944 5945 5946 5947
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

5948
	probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
5949 5950 5951 5952 5953 5954 5955 5956 5957 5958
	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
5959
	probe_ent->port_flags = port->flags;
5960 5961 5962 5963
	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;
5964
	probe_ent->private_data = port->private_data;
5965 5966 5967 5968

	return probe_ent;
}

L
Linus Torvalds 已提交
5969 5970 5971
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
5972 5973 5974 5975 5976 5977 5978
 *
 *	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
5979
 */
E
Edward Falk 已提交
5980

L
Linus Torvalds 已提交
5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994
void ata_std_ports(struct ata_ioports *ioaddr)
{
	ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
	ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
	ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
	ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
	ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
	ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
	ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
	ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
	ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
	ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
}

E
Edward Falk 已提交
5995

5996 5997
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
5998 5999 6000 6001
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6002 6003 6004
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
6005 6006 6007 6008
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6009
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6010 6011
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6012
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6013

T
Tejun Heo 已提交
6014
	ata_host_detach(host);
L
Linus Torvalds 已提交
6015 6016 6017
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6018
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
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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;
}
J
Jens Axboe 已提交
6050

6051
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6052 6053
{
	pci_save_state(pdev);
6054
	pci_disable_device(pdev);
6055

6056
	if (mesg.event == PM_EVENT_SUSPEND)
6057
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6058 6059
}

6060
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6061
{
6062 6063
	int rc;

J
Jens Axboe 已提交
6064 6065
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6066

T
Tejun Heo 已提交
6067
	rc = pcim_enable_device(pdev);
6068 6069 6070 6071 6072 6073
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
6074
	pci_set_master(pdev);
6075
	return 0;
6076 6077
}

6078
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6079
{
J
Jeff Garzik 已提交
6080
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6081 6082
	int rc = 0;

J
Jeff Garzik 已提交
6083
	rc = ata_host_suspend(host, mesg);
6084 6085 6086
	if (rc)
		return rc;

6087
	ata_pci_device_do_suspend(pdev, mesg);
6088 6089 6090 6091 6092 6093

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6094
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6095
	int rc;
6096

6097 6098 6099 6100
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6101
}
L
Linus Torvalds 已提交
6102 6103 6104 6105 6106
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6107
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6108 6109 6110 6111
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6112 6113 6114 6115 6116 6117
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6118 6119 6120 6121 6122 6123 6124
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6125
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6126 6127
}

6128
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6129 6130
module_exit(ata_exit);

6131
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6132
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151

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;
}

6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197
/**
 *	ata_wait_register - wait until register value changes
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
 *	@interval_msec: polling interval in milliseconds
 *	@timeout_msec: timeout in milliseconds
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
		      unsigned long interval_msec,
		      unsigned long timeout_msec)
{
	unsigned long timeout;
	u32 tmp;

	tmp = ioread32(reg);

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

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

	return tmp;
}

T
Tejun Heo 已提交
6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230
/*
 * Dummy port_ops
 */
static void ata_dummy_noret(struct ata_port *ap)	{ }
static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }

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

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

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

L
Linus Torvalds 已提交
6231 6232 6233 6234 6235 6236 6237
/*
 * 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.
 */

6238 6239 6240
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
T
Tejun Heo 已提交
6241
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6242 6243
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6244
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6245
EXPORT_SYMBOL_GPL(ata_device_add);
T
Tejun Heo 已提交
6246
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6247 6248
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6249
EXPORT_SYMBOL_GPL(ata_hsm_move);
6250
EXPORT_SYMBOL_GPL(ata_qc_complete);
6251
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263
EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
EXPORT_SYMBOL_GPL(ata_interrupt);
T
Tejun Heo 已提交
6264 6265
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6266
EXPORT_SYMBOL_GPL(ata_qc_prep);
6267
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6268 6269 6270 6271 6272
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);
6273 6274 6275 6276 6277
EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
L
Linus Torvalds 已提交
6278
EXPORT_SYMBOL_GPL(ata_port_probe);
6279
EXPORT_SYMBOL_GPL(sata_set_spd);
6280 6281
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6282 6283 6284
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6285
EXPORT_SYMBOL_GPL(ata_std_prereset);
6286
EXPORT_SYMBOL_GPL(ata_std_softreset);
6287
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6288 6289
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6290 6291
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6292
EXPORT_SYMBOL_GPL(ata_port_disable);
6293
EXPORT_SYMBOL_GPL(ata_ratelimit);
6294
EXPORT_SYMBOL_GPL(ata_wait_register);
6295
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6296
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6297 6298 6299
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6300
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6301
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6302
EXPORT_SYMBOL_GPL(ata_host_intr);
6303 6304 6305 6306 6307 6308
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
6309 6310
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6311 6312
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6313
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6314 6315
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6316
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6317 6318 6319
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6320 6321 6322 6323 6324
#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);
6325 6326
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6327 6328
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
Alan Cox 已提交
6329 6330
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6331
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6332 6333 6334

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6335 6336

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6337 6338
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6339 6340 6341
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6342 6343
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6344
EXPORT_SYMBOL_GPL(ata_do_eh);
6345 6346 6347 6348
EXPORT_SYMBOL_GPL(ata_irq_on);
EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
EXPORT_SYMBOL_GPL(ata_irq_ack);
EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
A
Akira Iguchi 已提交
6349
EXPORT_SYMBOL_GPL(ata_dev_try_classify);