libata-core.c 169.5 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

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

#include "libata.h"

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#define DRV_VERSION	"2.21"	/* must be exactly four chars */
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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
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unsigned int ata_print_id = 1;
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static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

		ofs++;
		len -= 2;
	}
}

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

	WARN_ON(!(len & 1));

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

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

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

	return ++sectors;
}

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

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

	return ++sectors;
}

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

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

	ata_tf_init(dev, &tf);

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

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

	return ata_tf_to_lba48(&tf);
}

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

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

	ata_tf_init(dev, &tf);

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

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

	return ata_tf_to_lba(&tf);
}

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

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

	new_sectors--;

	ata_tf_init(dev, &tf);

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

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

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

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

	return ata_tf_to_lba48(&tf);
}

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

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

	new_sectors--;

	ata_tf_init(dev, &tf);

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

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

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

	return ata_tf_to_lba(&tf);
}

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

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

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

1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1158
 *	@id: IDENTIFY DEVICE page to dump
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 *
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 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

1167
static inline void ata_dump_id(const u16 *id)
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{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1174 1175 1176 1177 1178
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
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1179 1180 1181 1182 1183
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1184 1185 1186 1187 1188
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1189 1190
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1191 1192
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1193 1194
}

1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
static unsigned int ata_id_xfermask(const u16 *id)
{
	unsigned int pio_mask, mwdma_mask, udma_mask;

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1224
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1225 1226 1227 1228
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238

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

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1239

1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
		int pio = id[163] & 0x7;
		int dma = (id[163] >> 3) & 7;

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

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

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1264 1265 1266
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1267
 *	@fn: workqueue function to be scheduled
1268
 *	@data: data for @fn to use
1269
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
 *
 *	Schedule @fn(@data) for execution after @delay jiffies using
 *	port_task.  There is one port_task per port and it's the
 *	user(low level driver)'s responsibility to make sure that only
 *	one task is active at any given time.
 *
 *	libata core layer takes care of synchronization between
 *	port_task and EH.  ata_port_queue_task() may be ignored for EH
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
1283
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1284 1285 1286 1287
			 unsigned long delay)
{
	int rc;

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

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

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

	/* rc == 0 means that another user is using port task */
	WARN_ON(rc == 0);
}

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

	DPRINTK("ENTER\n");

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

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

	/*
	 * At this point, if a task is running, it's guaranteed to see
	 * the FLUSH flag; thus, it will never queue pio tasks again.
	 * Cancel and flush.
	 */
	if (!cancel_delayed_work(&ap->port_task)) {
1329
		if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1330 1331
			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
					__FUNCTION__);
1332
		cancel_work_sync(&ap->port_task.work);
T
Tejun Heo 已提交
1333 1334
	}

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

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

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

	complete(waiting);
}

/**
1351
 *	ata_exec_internal_sg - execute libata internal command
1352 1353
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1354
 *	@cdb: CDB for packet command
1355
 *	@dma_dir: Data tranfer direction of the command
1356 1357
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1358 1359 1360 1361 1362 1363 1364 1365 1366
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1367 1368 1369
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1370
 */
1371 1372 1373 1374
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
			      int dma_dir, struct scatterlist *sg,
			      unsigned int n_elem)
1375
{
T
Tejun Heo 已提交
1376
	struct ata_port *ap = dev->ap;
1377 1378
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1379
	unsigned int tag, preempted_tag;
1380
	u32 preempted_sactive, preempted_qc_active;
1381
	DECLARE_COMPLETION_ONSTACK(wait);
1382
	unsigned long flags;
1383
	unsigned int err_mask;
1384
	int rc;
1385

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

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

1394
	/* initialize internal qc */
1395

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

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

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

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

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

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

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

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

1442
	ata_qc_issue(qc);
1443

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

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

	ata_port_flush_task(ap);
1449

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

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

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

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

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

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

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

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

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

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

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

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

1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511
	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
	 * Until those drivers are fixed, we detect the condition
	 * here, fail the command with AC_ERR_SYSTEM and reenable the
	 * port.
	 *
	 * Note that this doesn't change any behavior as internal
	 * command failure results in disabling the device in the
	 * higher layer for LLDDs without new reset/EH callbacks.
	 *
	 * Kill the following code as soon as those drivers are fixed.
	 */
1512
	if (ap->flags & ATA_FLAG_DISABLED) {
1513 1514 1515 1516
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

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

1519
	return err_mask;
1520 1521
}

1522
/**
1523
 *	ata_exec_internal - execute libata internal command
1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
			   int dma_dir, void *buf, unsigned int buflen)
{
1544 1545
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1546

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

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

1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1570
 */
1571
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1572 1573 1574 1575 1576 1577 1578 1579 1580
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

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

1584 1585 1586 1587 1588 1589 1590
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
J
Jeff Garzik 已提交
1591

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

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

A
Alan Cox 已提交
1615 1616
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1617 1618
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1619
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1620 1621 1622 1623
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1624 1625
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1626 1627
		}
	}
A
Alan Cox 已提交
1628
	return 3 << ATA_SHIFT_PIO;
1629 1630
}

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

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

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

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

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

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

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

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

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

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

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

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

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

1728
	/* sanity check */
1729
	rc = -EINVAL;
A
Alan Cox 已提交
1730
	reason = "device reports invalid type";
1731 1732 1733 1734 1735 1736 1737

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1738 1739
	}

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

1766
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1767 1768 1769 1770 1771 1772 1773 1774 1775
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
		 * IDENTIFY
		 * INITIALIZE DEVICE PARAMETERS
		 * anything else..
		 * Some drives were very specific about that exact sequence.
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1776
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1777 1778 1779 1780 1781 1782 1783 1784 1785
			if (err_mask) {
				rc = -EIO;
				reason = "INIT_DEV_PARAMS failed";
				goto err_out;
			}

			/* current CHS translation info (id[53-58]) might be
			 * changed. reread the identify device info.
			 */
1786
			flags &= ~ATA_READID_POSTRESET;
1787 1788 1789 1790 1791
			goto retry;
		}
	}

	*p_class = class;
1792

1793 1794 1795
	return 0;

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

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

1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
	struct ata_port *ap = dev->ap;
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
		return;
	}
1817 1818 1819 1820
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1821
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1822
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1823 1824 1825 1826 1827 1828 1829 1830 1831
		dev->flags |= ATA_DFLAG_NCQ;
	}

	if (hdepth >= ddepth)
		snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
	else
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
}

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

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

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

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

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

1875
	/* print device capabilities */
1876
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1877 1878 1879
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
1880
			       __FUNCTION__,
1881 1882
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1883

1884
	/* initialize to-be-configured parameters */
1885
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1886 1887 1888 1889 1890 1891 1892
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;

L
Linus Torvalds 已提交
1893 1894 1895 1896
	/*
	 * common ATA, ATAPI feature tests
	 */

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

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

1903 1904 1905 1906 1907 1908 1909
	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
			sizeof(fwrevbuf));

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

L
Linus Torvalds 已提交
1910 1911
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1912 1913
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1914 1915 1916
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1917 1918 1919 1920 1921
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1922
		dev->n_sectors = ata_id_n_sectors(id);
1923

1924 1925 1926
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

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

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

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

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

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

1948
			/* print device info to dmesg */
1949 1950 1951 1952 1953 1954 1955
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
1956
					(unsigned long long)dev->n_sectors,
1957 1958
					dev->multi_count, lba_desc, ncq_desc);
			}
1959
		} else {
1960 1961 1962
			/* CHS */

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

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

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

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

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

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

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

L
Linus Torvalds 已提交
2010
		/* print device info to dmesg */
2011
		if (ata_msg_drv(ap) && print_info)
2012 2013 2014
			ata_dev_printk(dev, KERN_INFO,
				       "ATAPI: %s, %s, max %s%s\n",
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2015 2016
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
2017 2018
	}

2019 2020 2021 2022 2023
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
	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");
		}
	}

2036
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2037
	if (ata_dev_knobble(dev)) {
2038
		if (ata_msg_drv(ap) && print_info)
2039 2040
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2041
		dev->udma_mask &= ATA_UDMA5;
2042 2043 2044
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2045
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_MAX_SEC_128)
2046 2047
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2048

2049 2050 2051 2052
	/* limit ATAPI DMA to R/W commands only */
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_DMA_RW_ONLY)
		dev->horkage |= ATA_HORKAGE_DMA_RW_ONLY;

2053
	if (ap->ops->dev_config)
2054
		ap->ops->dev_config(dev);
2055

2056 2057 2058
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2059
	return 0;
L
Linus Torvalds 已提交
2060 2061

err_out_nosup:
2062
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2063 2064
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2065
	return rc;
L
Linus Torvalds 已提交
2066 2067
}

A
Alan Cox 已提交
2068
/**
2069
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2070 2071
 *	@ap: port
 *
2072
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2073 2074 2075 2076 2077 2078 2079 2080 2081
 *	detection.
 */

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

/**
2082
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2083 2084
 *	@ap: port
 *
2085
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
 *	detection.
 */

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

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

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

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

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

L
Linus Torvalds 已提交
2118 2119 2120 2121
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2122 2123 2124 2125
 *	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
2126
 *	LOCKING:
J
Jeff Garzik 已提交
2127
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2128 2129
 *
 *	RETURNS:
2130
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2131 2132
 */

2133
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2134
{
2135
	unsigned int classes[ATA_MAX_DEVICES];
2136
	int tries[ATA_MAX_DEVICES];
2137
	int i, rc;
2138
	struct ata_device *dev;
L
Linus Torvalds 已提交
2139

2140
	ata_port_probe(ap);
2141

2142 2143 2144 2145
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
2146
	/* reset and determine device classes */
2147
	ap->ops->phy_reset(ap);
2148

2149 2150
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
2151

2152 2153 2154 2155 2156
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2157

2158
		dev->class = ATA_DEV_UNKNOWN;
2159
	}
L
Linus Torvalds 已提交
2160

2161
	ata_port_probe(ap);
2162

A
Alan Cox 已提交
2163 2164 2165 2166 2167 2168
	/* 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;

2169 2170 2171 2172 2173
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

	for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
2174
		dev = &ap->device[i];
2175

2176 2177
		if (tries[i])
			dev->class = classes[i];
2178

2179
		if (!ata_dev_enabled(dev))
2180 2181
			continue;

2182 2183
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2184 2185
		if (rc)
			goto fail;
2186 2187
	}

A
Alan Cox 已提交
2188 2189 2190 2191
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

2192 2193 2194 2195 2196 2197 2198
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

	for(i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;
2199

2200 2201 2202
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2203 2204
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2205 2206
	}

2207
	/* configure transfer mode */
2208
	rc = ata_set_mode(ap, &dev);
2209
	if (rc)
2210
		goto fail;
L
Linus Torvalds 已提交
2211

2212 2213 2214
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
2215

2216 2217
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
2218
	ap->ops->port_disable(ap);
2219
	return -ENODEV;
2220 2221

 fail:
2222 2223
	tries[dev->devno]--;

2224 2225
	switch (rc) {
	case -EINVAL:
2226
		/* eeek, something went very wrong, give up */
2227 2228
		tries[dev->devno] = 0;
		break;
2229 2230 2231 2232

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2233
	case -EIO:
2234 2235 2236 2237 2238 2239 2240
		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);
		}
2241 2242
	}

2243
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2244
		ata_dev_disable(dev);
2245

2246
	goto retry;
L
Linus Torvalds 已提交
2247 2248 2249
}

/**
J
Jeff Garzik 已提交
2250 2251
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2252
 *
J
Jeff Garzik 已提交
2253 2254 2255
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2256
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2257
 *	serialization.
L
Linus Torvalds 已提交
2258 2259 2260 2261
 */

void ata_port_probe(struct ata_port *ap)
{
2262
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2263 2264
}

2265 2266 2267 2268 2269 2270 2271 2272 2273
/**
 *	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.
 */
2274
void sata_print_link_status(struct ata_port *ap)
2275
{
2276
	u32 sstatus, scontrol, tmp;
2277

2278
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2279
		return;
2280
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2281

2282
	if (ata_port_online(ap)) {
2283
		tmp = (sstatus >> 4) & 0xf;
2284 2285 2286
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2287
	} else {
2288 2289 2290
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2291 2292 2293
	}
}

L
Linus Torvalds 已提交
2294
/**
J
Jeff Garzik 已提交
2295 2296
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2297
 *
J
Jeff Garzik 已提交
2298 2299 2300
 *	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
2301 2302
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2303
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2304 2305 2306 2307 2308 2309 2310 2311
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2312
		/* issue phy wake/reset */
2313
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2314 2315 2316
		/* 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
2317
	}
2318 2319
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2320 2321 2322 2323

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2324
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2325 2326 2327 2328
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2329 2330
	/* print link status */
	sata_print_link_status(ap);
2331

2332
	/* TODO: phy layer with polling, timeouts, etc. */
2333
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2334
		ata_port_probe(ap);
2335
	else
L
Linus Torvalds 已提交
2336 2337
		ata_port_disable(ap);

2338
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349
		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
2350 2351
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2352
 *
J
Jeff Garzik 已提交
2353 2354
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2355 2356
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2357
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2358 2359 2360 2361 2362
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2363
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2364 2365 2366 2367
		return;
	ata_bus_reset(ap);
}

2368 2369 2370 2371 2372 2373 2374
/**
 *	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
 */
2375

T
Tejun Heo 已提交
2376
struct ata_device *ata_dev_pair(struct ata_device *adev)
2377
{
T
Tejun Heo 已提交
2378
	struct ata_port *ap = adev->ap;
2379
	struct ata_device *pair = &ap->device[1 - adev->devno];
2380
	if (!ata_dev_enabled(pair))
2381 2382 2383 2384
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2385
/**
J
Jeff Garzik 已提交
2386 2387
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2388
 *
J
Jeff Garzik 已提交
2389 2390 2391 2392 2393
 *	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
2394
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2395
 *	serialization.
L
Linus Torvalds 已提交
2396 2397 2398 2399 2400 2401
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2402
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2403 2404
}

2405
/**
2406
 *	sata_down_spd_limit - adjust SATA spd limit downward
2407 2408 2409 2410
 *	@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
2411
 *	using sata_set_spd().
2412 2413 2414 2415 2416 2417 2418
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2419
int sata_down_spd_limit(struct ata_port *ap)
2420
{
2421 2422
	u32 sstatus, spd, mask;
	int rc, highbit;
2423

2424 2425 2426
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2427 2428 2429 2430 2431 2432 2433

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

2434
	spd = (sstatus >> 4) & 0xf;
2435 2436 2437 2438 2439 2440 2441 2442 2443
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2444 2445
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2446 2447 2448 2449

	return 0;
}

2450
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
{
	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;
}

/**
2466
 *	sata_set_spd_needed - is SATA spd configuration needed
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
 *	@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.
 */
2480
int sata_set_spd_needed(struct ata_port *ap)
2481 2482 2483
{
	u32 scontrol;

2484
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2485 2486
		return 0;

2487
	return __sata_set_spd_needed(ap, &scontrol);
2488 2489 2490
}

/**
2491
 *	sata_set_spd - set SATA spd according to spd limit
2492 2493 2494 2495 2496 2497 2498 2499 2500
 *	@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
2501
 *	changed.  Negative errno if SCR registers are inaccessible.
2502
 */
2503
int sata_set_spd(struct ata_port *ap)
2504 2505
{
	u32 scontrol;
2506
	int rc;
2507

2508 2509
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2510

2511
	if (!__sata_set_spd_needed(ap, &scontrol))
2512 2513
		return 0;

2514 2515 2516
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2517 2518 2519
	return 1;
}

A
Alan Cox 已提交
2520 2521 2522 2523 2524
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2525
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2526
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2527 2528 2529
 * 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
2530 2531 2532 2533 2534 2535 2536 2537 2538
 */

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 },

2539 2540
	{ 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
2541 2542 2543 2544 2545
	{ 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 }, */
2546

A
Alan Cox 已提交
2547 2548 2549
	{ 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 },
2550

A
Alan Cox 已提交
2551 2552 2553 2554
	{ 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 },

2555 2556
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
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Alan Cox 已提交
2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601
	{ 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
2602
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2603
			return NULL;
2604
	return t;
A
Alan Cox 已提交
2605 2606 2607 2608 2609 2610 2611 2612 2613
}

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;

	/*
2614
	 * Find the mode.
2615
	 */
A
Alan Cox 已提交
2616 2617 2618 2619

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

2620 2621
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641
	/*
	 * 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.
	 */

2642
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2643 2644

	/*
2645 2646 2647
	 * 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
2648 2649
	 */

2650
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2651 2652 2653 2654 2655
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2656
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
	 */

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

	if (t->active + t->recover < t->cycle) {
		t->active += (t->cycle - (t->active + t->recover)) / 2;
		t->recover = t->cycle - t->active;
	}
J
Jeff Garzik 已提交
2668

2669 2670 2671 2672 2673
	/* In a few cases quantisation may produce enough errors to
	   leave t->cycle too low for the sum of active and recovery
	   if so we must correct this */
	if (t->active + t->recover > t->cycle)
		t->cycle = t->active + t->recover;
A
Alan Cox 已提交
2674 2675 2676 2677

	return 0;
}

2678 2679 2680
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2681
 *	@sel: ATA_DNXFER_* selector
2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692
 *
 *	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
 */
2693
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2694
{
2695 2696 2697 2698
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2699

2700 2701
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2702

2703 2704 2705 2706
	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);
2707

2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759
	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);
	}
2760 2761 2762 2763 2764 2765 2766

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

	return 0;
}

T
Tejun Heo 已提交
2767
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2768
{
2769
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2770 2771
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2772

2773
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2774 2775 2776
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2777
	err_mask = ata_dev_set_xfermode(dev);
2778 2779 2780 2781
	/* 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;

2782
	if (err_mask) {
2783 2784
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2785 2786
		return -EIO;
	}
L
Linus Torvalds 已提交
2787

2788
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2789
	rc = ata_dev_revalidate(dev, 0);
2790
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2791
	if (rc)
2792
		return rc;
2793

2794 2795
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2796

2797 2798
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2799
	return 0;
L
Linus Torvalds 已提交
2800 2801 2802
}

/**
2803
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
L
Linus Torvalds 已提交
2804
 *	@ap: port on which timings will be programmed
2805
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2806
 *
2807 2808 2809
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
2810
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2811
 *
L
Linus Torvalds 已提交
2812
 *	LOCKING:
J
Jeff Garzik 已提交
2813
 *	PCI/etc. bus probe sem.
2814 2815 2816
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2817
 */
2818 2819

int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2820
{
2821
	struct ata_device *dev;
2822
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2823

2824

2825 2826
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2827
		unsigned int pio_mask, dma_mask;
2828

2829 2830
		dev = &ap->device[i];

2831
		if (!ata_dev_enabled(dev))
2832 2833
			continue;

T
Tejun Heo 已提交
2834
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2835

2836 2837 2838 2839
		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);
2840

2841
		found = 1;
2842 2843
		if (dev->dma_mode)
			used_dma = 1;
2844
	}
2845
	if (!found)
2846
		goto out;
2847 2848

	/* step 2: always set host PIO timings */
2849 2850 2851 2852 2853 2854
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2855
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2856
			rc = -EINVAL;
2857
			goto out;
2858 2859 2860 2861 2862 2863 2864
		}

		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
2865

2866
	/* step 3: set host DMA timings */
2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877
	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
2878 2879

	/* step 4: update devices' xfer mode */
2880
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2881
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2882

A
Alan 已提交
2883
		/* don't update suspended devices' xfer mode */
2884
		if (!ata_dev_enabled(dev))
2885 2886
			continue;

T
Tejun Heo 已提交
2887
		rc = ata_dev_set_mode(dev);
2888
		if (rc)
2889
			goto out;
2890
	}
L
Linus Torvalds 已提交
2891

2892 2893
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2894
	 */
J
Jeff Garzik 已提交
2895
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2896
		ap->host->simplex_claimed = ap;
2897

2898 2899 2900 2901
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2902 2903
}

2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
 *	@r_failed_dev: out paramter for failed device
 *
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
{
	/* has private set_mode? */
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
	return ata_do_set_mode(ap, r_failed_dev);
}

2927 2928 2929 2930 2931 2932 2933 2934 2935 2936
/**
 *	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
2937
 *	spin_lock_irqsave(host lock)
2938 2939 2940 2941 2942 2943 2944 2945 2946
 */

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
2947 2948 2949 2950 2951 2952
/**
 *	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
2953 2954 2955
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2956 2957 2958 2959 2960
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2961
 */
2962 2963
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2964 2965 2966 2967 2968 2969 2970
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2971 2972
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2973 2974 2975 2976
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2977
	if (status != 0xff && (status & ATA_BUSY))
2978
		ata_port_printk(ap, KERN_WARNING,
2979 2980
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2981 2982

	timeout = timer_start + tmout;
2983 2984
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2985 2986 2987 2988
		msleep(50);
		status = ata_chk_status(ap);
	}

2989 2990 2991
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2992
	if (status & ATA_BUSY) {
2993
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2994 2995
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2996
		return -EBUSY;
L
Linus Torvalds 已提交
2997 2998 2999 3000 3001
	}

	return 0;
}

3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026
/**
 *	ata_wait_ready - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	Sleep until ATA Status register bit BSY clears, or timeout
 *	occurs.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
{
	unsigned long start = jiffies;
	int warned = 0;

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

		if (!(status & ATA_BUSY))
			return 0;
3027
		if (!ata_port_online(ap) && status == 0xff)
3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045
			return -ENODEV;
		if (time_after(now, deadline))
			return -EBUSY;

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

		msleep(50);
	}
}

static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
			      unsigned long deadline)
L
Linus Torvalds 已提交
3046 3047 3048 3049
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3050
	int rc, ret = 0;
L
Linus Torvalds 已提交
3051 3052 3053 3054

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

3064 3065
	/* if device 1 was found in ata_devchk, wait for register
	 * access briefly, then wait for BSY to clear.
L
Linus Torvalds 已提交
3066
	 */
3067 3068
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3069 3070

		ap->ops->dev_select(ap, 1);
3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085

		/* Wait for register access.  Some ATAPI devices fail
		 * to set nsect/lbal after reset, so don't waste too
		 * much time on it.  We're gonna wait for !BSY anyway.
		 */
		for (i = 0; i < 2; i++) {
			u8 nsect, lbal;

			nsect = ioread8(ioaddr->nsect_addr);
			lbal = ioread8(ioaddr->lbal_addr);
			if ((nsect == 1) && (lbal == 1))
				break;
			msleep(50);	/* give drive a breather */
		}

3086
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3087 3088 3089 3090 3091
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3092
	}
L
Linus Torvalds 已提交
3093 3094 3095 3096 3097 3098 3099

	/* 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);
3100

T
Tejun Heo 已提交
3101
	return ret;
L
Linus Torvalds 已提交
3102 3103
}

3104 3105
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3106 3107 3108
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3109
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3110 3111

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3112 3113 3114 3115 3116
	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
3117 3118 3119 3120 3121 3122 3123 3124

	/* 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.
3125 3126
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3127 3128 3129
	 */
	msleep(150);

3130
	/* Before we perform post reset processing we want to see if
3131 3132 3133
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3134
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3135
		return -ENODEV;
3136

3137
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152
}

/**
 *	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
3153
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3154
 *	Obtains host lock.
L
Linus Torvalds 已提交
3155 3156
 *
 *	SIDE EFFECTS:
3157
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3158 3159 3160 3161 3162 3163 3164
 */

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
3165
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3166
	int rc;
L
Linus Torvalds 已提交
3167

T
Tejun Heo 已提交
3168
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187

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

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

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

	/* issue bus reset */
T
Tejun Heo 已提交
3188 3189 3190
	if (ap->flags & ATA_FLAG_SRST) {
		rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
		if (rc && rc != -ENODEV)
T
Tejun Heo 已提交
3191
			goto err_out;
T
Tejun Heo 已提交
3192
	}
L
Linus Torvalds 已提交
3193 3194 3195 3196

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3197
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
3198
	if ((slave_possible) && (err != 0x81))
3199
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
3200 3201

	/* re-enable interrupts */
3202
	ap->ops->irq_on(ap);
L
Linus Torvalds 已提交
3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216

	/* 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
3217
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3218 3219 3220 3221 3222 3223
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3224
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
3225 3226 3227 3228 3229
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

3230 3231 3232 3233
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3234
 *	@deadline: deadline jiffies for the operation
3235 3236 3237 3238
 *
 *	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
3239 3240
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3241 3242
 *	until timeout then returns 0 if DET is stable at 1.
 *
3243 3244 3245
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3246 3247 3248 3249 3250 3251
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3252 3253
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
		      unsigned long deadline)
3254
{
3255
	unsigned long interval_msec = params[0];
3256 3257
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3258 3259 3260
	u32 last, cur;
	int rc;

3261 3262 3263 3264
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279
	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) {
3280
			if (cur == 1 && time_before(jiffies, deadline))
3281 3282 3283 3284 3285 3286 3287 3288 3289 3290
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3291 3292
		/* check deadline */
		if (time_after(jiffies, deadline))
3293 3294 3295 3296 3297 3298 3299 3300
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3301
 *	@deadline: deadline jiffies for the operation
3302 3303 3304 3305 3306 3307 3308 3309 3310
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3311 3312
int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
		    unsigned long deadline)
3313 3314
{
	u32 scontrol;
3315 3316 3317 3318
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
3319

3320
	scontrol = (scontrol & 0x0f0) | 0x300;
3321 3322 3323

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
3324

3325 3326 3327 3328
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3329

3330
	return sata_phy_debounce(ap, params, deadline);
3331 3332
}

3333 3334 3335
/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
3336
 *	@deadline: deadline jiffies for the operation
3337
 *
T
Tejun Heo 已提交
3338 3339 3340 3341 3342
 *	@ap is about to be reset.  Initialize it.  Failure from
 *	prereset makes libata abort whole reset sequence and give up
 *	that port, so prereset should be best-effort.  It does its
 *	best to prepare for reset sequence but if things go wrong, it
 *	should just whine, not fail.
3343 3344 3345 3346 3347 3348 3349
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3350
int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
3351 3352
{
	struct ata_eh_context *ehc = &ap->eh_context;
3353
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3354 3355
	int rc;

T
Tejun Heo 已提交
3356
	/* handle link resume */
3357 3358 3359 3360
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

3361 3362 3363 3364 3365 3366
	/* 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) {
3367
		rc = sata_phy_resume(ap, timing, deadline);
T
Tejun Heo 已提交
3368 3369
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3370 3371 3372 3373 3374 3375 3376
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"link for reset (errno=%d)\n", rc);
	}

	/* Wait for !BSY if the controller can wait for the first D2H
	 * Reg FIS and we don't know that no device is attached.
	 */
T
Tejun Heo 已提交
3377 3378
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
		rc = ata_wait_ready(ap, deadline);
3379
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3380 3381 3382 3383 3384
			ata_port_printk(ap, KERN_WARNING, "device not ready "
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3385 3386 3387 3388

	return 0;
}

3389 3390 3391 3392
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
3393
 *	@deadline: deadline jiffies for the operation
3394
 *
3395
 *	Reset host port using ATA SRST.
3396 3397 3398 3399 3400 3401 3402
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3403 3404
int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
		      unsigned long deadline)
3405 3406
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3407 3408
	unsigned int devmask = 0;
	int rc;
3409 3410 3411 3412
	u8 err;

	DPRINTK("ENTER\n");

3413
	if (ata_port_offline(ap)) {
3414 3415 3416 3417
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428
	/* 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);
3429
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3430 3431
	/* if link is occupied, -ENODEV too is an error */
	if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
3432 3433
		ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
		return rc;
3434 3435 3436 3437 3438 3439 3440
	}

	/* 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);

3441
 out:
3442 3443 3444 3445 3446
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3447
 *	sata_port_hardreset - reset port via SATA phy reset
3448
 *	@ap: port to reset
3449
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3450
 *	@deadline: deadline jiffies for the operation
3451 3452 3453 3454 3455 3456 3457 3458 3459
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3460 3461
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
			unsigned long deadline)
3462
{
3463
	u32 scontrol;
3464
	int rc;
3465

3466 3467
	DPRINTK("ENTER\n");

3468
	if (sata_set_spd_needed(ap)) {
3469 3470 3471 3472 3473
		/* 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.
		 */
3474
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3475
			goto out;
3476

3477
		scontrol = (scontrol & 0x0f0) | 0x304;
3478 3479

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3480
			goto out;
3481

3482
		sata_set_spd(ap);
3483 3484 3485
	}

	/* issue phy wake/reset */
3486
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3487
		goto out;
3488

3489
	scontrol = (scontrol & 0x0f0) | 0x301;
3490 3491

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3492
		goto out;
3493

3494
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3495 3496 3497 3498
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3499
	/* bring phy back */
3500
	rc = sata_phy_resume(ap, timing, deadline);
3501 3502 3503 3504 3505 3506 3507 3508 3509
 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
3510
 *	@deadline: deadline jiffies for the operation
3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
 *
 *	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.
 */
3521 3522
int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
		       unsigned long deadline)
3523 3524 3525 3526 3527 3528 3529
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
3530
	rc = sata_port_hardreset(ap, timing, deadline);
3531 3532 3533 3534 3535
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3536 3537

	/* TODO: phy layer with polling, timeouts, etc. */
3538
	if (ata_port_offline(ap)) {
3539 3540 3541 3542 3543
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3544 3545 3546
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3547
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3548 3549
	/* link occupied, -ENODEV too is an error */
	if (rc) {
3550
		ata_port_printk(ap, KERN_ERR,
3551 3552
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3553 3554
	}

3555 3556
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576
	*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)
{
3577 3578
	u32 serror;

3579 3580 3581
	DPRINTK("ENTER\n");

	/* print link status */
3582
	sata_print_link_status(ap);
3583

3584 3585 3586 3587
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3588
	/* re-enable interrupts */
3589 3590
	if (!ap->ops->error_handler)
		ap->ops->irq_on(ap);
3591 3592 3593 3594 3595 3596 3597

	/* 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);

3598 3599 3600 3601 3602 3603 3604
	/* 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
3605 3606
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3607 3608 3609 3610

	DPRINTK("EXIT\n");
}

3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626
/**
 *	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
3627 3628
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3629 3630
{
	const u16 *old_id = dev->id;
3631 3632
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3633 3634

	if (dev->class != new_class) {
3635 3636
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3637 3638 3639
		return 0;
	}

3640 3641 3642 3643
	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]));
3644 3645

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

	if (strcmp(serial[0], serial[1])) {
3652 3653
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3654 3655 3656 3657 3658 3659 3660
		return 0;
	}

	return 1;
}

/**
3661 3662
 *	ata_dev_reread_id - Re-read IDENTIFY data
 *	@adev: target ATA device
3663
 *	@readid_flags: read ID flags
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673
 *
 *	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
 */
3674
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3675
{
3676
	unsigned int class = dev->class;
3677
	u16 *id = (void *)dev->ap->sector_buf;
3678 3679
	int rc;

3680
	/* read ID data */
3681
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3682
	if (rc)
3683
		return rc;
3684 3685

	/* is the device still there? */
3686 3687
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3688

3689
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
 *	@readid_flags: read ID flags
 *
 *	Re-read IDENTIFY page, make sure @dev is still attached to the
 *	port and reconfigure it according to the new IDENTIFY page.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
{
3709
	u64 n_sectors = dev->n_sectors;
3710 3711 3712 3713 3714 3715 3716 3717 3718
	int rc;

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

	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3719 3720

	/* configure device according to the new ID */
3721
	rc = ata_dev_configure(dev);
3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735
	if (rc)
		goto fail;

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

	return 0;
3736 3737

 fail:
3738
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3739 3740 3741
	return rc;
}

3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778
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 },
3779
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3780
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3781

3782
	/* Weird ATAPI devices */
3783 3784
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |
						ATA_HORKAGE_DMA_RW_ONLY },
3785

3786 3787 3788 3789 3790
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3791 3792
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3793 3794
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3795
	{ "Maxtor 6B200M0",	"BANC1B10",	ATA_HORKAGE_NONCQ },
3796 3797
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3798 3799 3800 3801 3802
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
3803 3804
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3805 3806
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3807 3808 3809 3810 3811

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3812
};
3813

3814
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3815
{
T
Tejun Heo 已提交
3816 3817
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3818
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3819

T
Tejun Heo 已提交
3820 3821
	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
3822

3823
	while (ad->model_num) {
T
Tejun Heo 已提交
3824
		if (!strcmp(ad->model_num, model_num)) {
3825 3826
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3827
			if (!strcmp(ad->model_rev, model_rev))
3828
				return ad->horkage;
3829
		}
3830
		ad++;
3831
	}
L
Linus Torvalds 已提交
3832 3833 3834
	return 0;
}

3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846
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;
}

3847 3848 3849 3850
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3851 3852 3853 3854
 *	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...
3855 3856 3857 3858
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3859
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3860
{
T
Tejun Heo 已提交
3861
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3862
	struct ata_host *host = ap->host;
3863
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3864

3865
	/* controller modes available */
3866 3867 3868
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3869
	/* drive modes available */
3870 3871 3872
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3873

3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884
	/*
	 *	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));
	}

3885 3886
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3887 3888
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3889
	}
3890

3891 3892
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3893 3894 3895
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3896
	}
3897

J
Jeff Garzik 已提交
3898 3899 3900
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

3901
	if (ap->ops->mode_filter)
3902
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3903

3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

3923 3924
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3925 3926 3927 3928 3929 3930
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3931 3932 3933
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3934
 *	LOCKING:
J
Jeff Garzik 已提交
3935
 *	PCI/etc. bus probe sem.
3936 3937 3938
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3939 3940
 */

T
Tejun Heo 已提交
3941
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3942
{
3943
	struct ata_taskfile tf;
3944
	unsigned int err_mask;
L
Linus Torvalds 已提交
3945 3946 3947 3948

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

T
Tejun Heo 已提交
3949 3950 3951
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
3952
	ata_tf_init(dev, &tf);
3953 3954
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
3955
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
3956 3957
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3958

T
Tejun Heo 已提交
3959
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3960

3961 3962
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3963 3964
}

3965 3966 3967
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3968 3969
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3970 3971
 *
 *	LOCKING:
3972 3973 3974 3975
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3976
 */
T
Tejun Heo 已提交
3977 3978
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3979
{
3980
	struct ata_taskfile tf;
3981
	unsigned int err_mask;
3982 3983 3984

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3985
		return AC_ERR_INVALID;
3986 3987 3988 3989

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

T
Tejun Heo 已提交
3990
	ata_tf_init(dev, &tf);
3991 3992 3993 3994 3995
	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 */
3996

T
Tejun Heo 已提交
3997
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3998

3999 4000
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4001 4002
}

L
Linus Torvalds 已提交
4003
/**
J
Jeff Garzik 已提交
4004 4005 4006 4007
 *	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
4008 4009
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4010
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4011
 */
4012
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4013 4014
{
	struct ata_port *ap = qc->ap;
4015
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4016
	int dir = qc->dma_dir;
4017
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4018

4019 4020
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4021 4022

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4023
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4024

J
Jeff Garzik 已提交
4025
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4026

4027 4028 4029 4030 4031 4032 4033 4034
	/* 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) {
4035
		if (qc->n_elem)
4036
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4037 4038 4039 4040 4041 4042
		/* 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);
4043
			kunmap_atomic(addr, KM_IRQ0);
4044 4045
		}
	} else {
4046
		if (qc->n_elem)
4047
			dma_unmap_single(ap->dev,
4048 4049
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4050 4051 4052 4053 4054 4055
		/* 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
4056 4057

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4058
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4059 4060 4061 4062 4063 4064
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4065 4066 4067
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4068
 *	LOCKING:
J
Jeff Garzik 已提交
4069
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4070 4071 4072 4073 4074
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4075 4076
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4077

4078
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4079
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4080 4081

	idx = 0;
4082
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115
		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
4116 4117 4118 4119
 *	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
4120
 *	LOCKING:
J
Jeff Garzik 已提交
4121
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4122
 *
L
Linus Torvalds 已提交
4123 4124 4125 4126 4127 4128 4129 4130
 *	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 */

4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150
	/* some drives can only do ATAPI DMA on read/write */
	if (unlikely(qc->dev->horkage & ATA_HORKAGE_DMA_RW_ONLY)) {
		struct scsi_cmnd *cmd = qc->scsicmd;
		u8 *scsicmd = cmd->cmnd;

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

L
Linus Torvalds 已提交
4151 4152 4153 4154 4155 4156 4157 4158 4159
	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
4160 4161
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4162
 *	LOCKING:
J
Jeff Garzik 已提交
4163
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4164 4165 4166 4167 4168 4169 4170 4171 4172
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4173 4174
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4175 4176 4177 4178 4179 4180 4181 4182 4183 4184
/**
 *	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
4185
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4186 4187
 */

L
Linus Torvalds 已提交
4188 4189 4190 4191
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4192
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4193
	qc->n_elem = 1;
4194
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4195
	qc->buf_virt = buf;
4196
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4197

4198
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4199 4200
}

J
Jeff Garzik 已提交
4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211
/**
 *	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
4212
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4213 4214
 */

L
Linus Torvalds 已提交
4215 4216 4217 4218
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4219
	qc->__sg = sg;
L
Linus Torvalds 已提交
4220
	qc->n_elem = n_elem;
4221
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4222 4223 4224
}

/**
J
Jeff Garzik 已提交
4225 4226 4227 4228
 *	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
4229 4230
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4231
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4232 4233
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4234
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4235 4236 4237 4238 4239 4240
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4241
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4242
	dma_addr_t dma_address;
4243
	int trim_sg = 0;
L
Linus Torvalds 已提交
4244

4245 4246 4247 4248 4249 4250
	/* 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;

4251
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262

		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;
4263 4264
		if (sg->length == 0)
			trim_sg = 1;
4265 4266 4267 4268 4269

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

4270 4271
	if (trim_sg) {
		qc->n_elem--;
4272 4273 4274
		goto skip_map;
	}

4275
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4276
				     sg->length, dir);
4277 4278 4279
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4280
		return -1;
4281
	}
L
Linus Torvalds 已提交
4282 4283

	sg_dma_address(sg) = dma_address;
4284
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4285

4286
skip_map:
L
Linus Torvalds 已提交
4287 4288 4289 4290 4291 4292 4293
	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
4294 4295 4296 4297
 *	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
4298 4299
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4300
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4301 4302
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4303
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4304 4305 4306 4307 4308 4309
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4310 4311
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4312
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4313

T
Tejun Heo 已提交
4314
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4315
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4316

4317 4318 4319 4320 4321 4322 4323
	/* 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;

4324
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338

		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);
4339
			kunmap_atomic(addr, KM_IRQ0);
4340 4341 4342 4343 4344 4345
		}

		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;
4346 4347
		if (lsg->length == 0)
			trim_sg = 1;
4348 4349 4350 4351 4352

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

4353 4354 4355 4356 4357 4358 4359 4360 4361
	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
4362
	dir = qc->dma_dir;
4363
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4364 4365 4366
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4367
		return -1;
4368
	}
L
Linus Torvalds 已提交
4369 4370 4371

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

4372
skip_map:
L
Linus Torvalds 已提交
4373 4374 4375 4376 4377
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4378
/**
4379
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4380 4381 4382 4383 4384 4385 4386 4387
 *	@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
4388
 *	Inherited from caller.
E
Edward Falk 已提交
4389
 */
L
Linus Torvalds 已提交
4390 4391 4392 4393 4394 4395 4396 4397 4398 4399
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
4400
/**
T
Tejun Heo 已提交
4401
 *	ata_data_xfer - Transfer data by PIO
4402
 *	@adev: device to target
A
Albert Lee 已提交
4403 4404
 *	@buf: data buffer
 *	@buflen: buffer length
4405
 *	@write_data: read/write
A
Albert Lee 已提交
4406 4407 4408 4409 4410 4411
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4412 4413
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4414
{
4415
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4416
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4417

A
Albert Lee 已提交
4418
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4419
	if (write_data)
T
Tejun Heo 已提交
4420
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4421
	else
T
Tejun Heo 已提交
4422
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4423 4424 4425 4426 4427 4428 4429 4430

	/* 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
4431
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4432
		} else {
T
Tejun Heo 已提交
4433
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4434 4435 4436
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4437 4438
}

4439
/**
T
Tejun Heo 已提交
4440
 *	ata_data_xfer_noirq - Transfer data by PIO
4441 4442 4443 4444 4445
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4446
 *	Transfer data from/to the device data register by PIO. Do the
4447 4448 4449 4450 4451
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4452 4453
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4454 4455 4456
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4457
	ata_data_xfer(adev, buf, buflen, write_data);
4458 4459 4460 4461
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4462
/**
4463
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4464 4465
 *	@qc: Command on going
 *
4466
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4467 4468 4469 4470 4471
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4472 4473 4474
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4475
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4476 4477 4478 4479 4480
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4481
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4482
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4483 4484

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4485
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4486 4487 4488 4489 4490 4491 4492

	/* 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");

4493 4494 4495
	if (PageHighMem(page)) {
		unsigned long flags;

4496
		/* FIXME: use a bounce buffer */
4497 4498
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4499

4500
		/* do the actual data transfer */
4501
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4502

4503 4504 4505 4506
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4507
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4508
	}
L
Linus Torvalds 已提交
4509

4510 4511
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4512

T
Tejun Heo 已提交
4513
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4514 4515 4516 4517 4518
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4519
/**
4520
 *	ata_pio_sectors - Transfer one or many sectors.
4521 4522
 *	@qc: Command on going
 *
4523
 *	Transfer one or many sectors of data from/to the
4524 4525 4526 4527 4528
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4529

4530 4531 4532 4533 4534 4535
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
4536
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4537

4538
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4539
			    qc->dev->multi_count);
4540 4541 4542 4543 4544 4545
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561
/**
 *	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");
4562
	WARN_ON(qc->dev->cdb_len < 12);
4563

4564
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579
	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
4580 4581
}

A
Albert Lee 已提交
4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593
/**
 *	__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
4594 4595 4596
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4597
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4598 4599 4600 4601 4602
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4603
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4604
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4605 4606

next_sg:
4607
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4608
		/*
4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619
		 * 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 */
4620 4621
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4622 4623

		for (i = 0; i < words; i++)
4624
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4625

A
Albert Lee 已提交
4626
		ap->hsm_task_state = HSM_ST_LAST;
4627 4628 4629
		return;
	}

4630
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4631 4632 4633 4634 4635 4636 4637 4638

	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;

4639
	/* don't overrun current sg */
4640
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4641 4642 4643 4644

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

4645 4646
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4647 4648 4649
	if (PageHighMem(page)) {
		unsigned long flags;

4650
		/* FIXME: use bounce buffer */
4651 4652
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4653

4654
		/* do the actual data transfer */
4655
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4656

4657 4658 4659 4660
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4661
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4662
	}
L
Linus Torvalds 已提交
4663 4664 4665 4666 4667

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

4668
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4669 4670 4671 4672
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4673
	if (bytes)
L
Linus Torvalds 已提交
4674 4675 4676
		goto next_sg;
}

A
Albert Lee 已提交
4677 4678 4679 4680 4681 4682 4683 4684 4685 4686
/**
 *	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
4687 4688 4689 4690 4691 4692 4693
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;

4694 4695 4696 4697 4698 4699 4700 4701 4702 4703
	/* 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
4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714
	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
4715
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4716

L
Linus Torvalds 已提交
4717 4718 4719 4720 4721
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4722
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4723
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4724
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4725 4726 4727
}

/**
4728 4729 4730
 *	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
4731
 *
4732 4733
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4734
 */
4735 4736

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4737
{
4738 4739
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4740

4741 4742 4743 4744
	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
4745

4746 4747 4748
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4749 4750
	}

4751 4752
	return 0;
}
L
Linus Torvalds 已提交
4753

T
Tejun Heo 已提交
4754 4755 4756 4757 4758 4759 4760 4761
/**
 *	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
4762
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4763 4764 4765 4766 4767 4768 4769 4770 4771
 *	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) {
4772
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4773

J
Jeff Garzik 已提交
4774 4775
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4776 4777 4778 4779
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4780
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4781 4782 4783 4784 4785
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4786
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4787 4788 4789 4790 4791 4792 4793 4794
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4795
			spin_lock_irqsave(ap->lock, flags);
4796
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4797
			ata_qc_complete(qc);
4798
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4799 4800 4801
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4802

4803
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4804 4805
}

4806 4807 4808 4809 4810 4811 4812 4813 4814 4815
/**
 *	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.
 */
4816 4817
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4818
{
4819 4820 4821
	unsigned long flags = 0;
	int poll_next;

4822 4823
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4824 4825 4826 4827
	/* 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).
	 */
4828
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4829

4830
fsm_start:
4831
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4832
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4833

4834 4835
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4836 4837 4838 4839 4840 4841 4842 4843
		/* 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);

4844
		/* check device status */
4845 4846 4847 4848 4849 4850 4851 4852 4853
		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
4854
			ap->hsm_task_state = HSM_ST_ERR;
4855
			goto fsm_start;
L
Linus Torvalds 已提交
4856 4857
		}

4858 4859
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4860 4861 4862
		 * 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.
4863 4864
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4865 4866
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4867
			qc->err_mask |= AC_ERR_HSM;
4868 4869
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4870
		}
L
Linus Torvalds 已提交
4871

4872 4873 4874 4875 4876 4877
		/* 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)
4878
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4879

4880 4881 4882 4883
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4884

4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896
			/* 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)
4897
			spin_unlock_irqrestore(ap->lock, flags);
4898 4899 4900 4901

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4902
		break;
4903

4904 4905 4906 4907 4908
	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) {
4909 4910 4911
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4912 4913 4914
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4915

4916 4917
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4918 4919 4920
			 * 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.
4921 4922
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4923 4924 4925
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4926
				qc->err_mask |= AC_ERR_HSM;
4927 4928
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4929
			}
L
Linus Torvalds 已提交
4930

4931
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4932

4933 4934 4935
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4936

4937 4938 4939 4940
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4941 4942 4943 4944
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4945 4946 4947 4948 4949 4950
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4951

4952 4953 4954
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4955

4956 4957 4958 4959 4960 4961 4962 4963 4964
			/* 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.
4965 4966 4967 4968
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4969 4970 4971 4972 4973 4974 4975

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

4976 4977 4978
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4979 4980 4981 4982 4983 4984
				/* 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;
4985 4986
			}

4987 4988 4989 4990 4991 4992
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4993
				status = ata_wait_idle(ap);
4994 4995 4996 4997 4998
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4999
		poll_next = 1;
L
Linus Torvalds 已提交
5000 5001
		break;

A
Albert Lee 已提交
5002
	case HSM_ST_LAST:
5003 5004
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5005 5006 5007 5008 5009
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5010
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5011
			ap->print_id, qc->dev->devno, status);
5012

5013 5014
		WARN_ON(qc->err_mask);

5015
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5016

5017
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5018
		ata_hsm_qc_complete(qc, in_wq);
5019 5020

		poll_next = 0;
L
Linus Torvalds 已提交
5021 5022
		break;

A
Albert Lee 已提交
5023
	case HSM_ST_ERR:
5024 5025 5026 5027 5028 5029
		/* 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;
5030

5031
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5032
		ata_hsm_qc_complete(qc, in_wq);
5033 5034

		poll_next = 0;
5035 5036
		break;
	default:
5037
		poll_next = 0;
5038
		BUG();
L
Linus Torvalds 已提交
5039 5040
	}

5041
	return poll_next;
L
Linus Torvalds 已提交
5042 5043
}

5044
static void ata_pio_task(struct work_struct *work)
5045
{
5046 5047 5048
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5049
	u8 status;
5050
	int poll_next;
5051

J
Jeff Garzik 已提交
5052
fsm_start:
5053
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5054

5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066
	/*
	 * 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) {
5067
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5068 5069
			return;
		}
5070 5071
	}

5072 5073
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5074

5075 5076 5077 5078
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5079
		goto fsm_start;
5080 5081
}

L
Linus Torvalds 已提交
5082 5083 5084 5085 5086 5087
/**
 *	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
5088
 *	None.
L
Linus Torvalds 已提交
5089 5090 5091 5092 5093 5094 5095
 */

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

5096
	/* no command while frozen */
5097
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5098 5099
		return NULL;

5100 5101
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5102
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5103
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117
			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
5118
 *	None.
L
Linus Torvalds 已提交
5119 5120
 */

T
Tejun Heo 已提交
5121
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5122
{
T
Tejun Heo 已提交
5123
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
5124 5125 5126 5127 5128 5129 5130 5131
	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
5132
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145
	}

	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
5146
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5147 5148 5149
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5150 5151 5152
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5153
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5154

5155 5156 5157 5158
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5159
		clear_bit(tag, &ap->qc_allocated);
5160
	}
L
Linus Torvalds 已提交
5161 5162
}

5163
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5164
{
5165 5166
	struct ata_port *ap = qc->ap;

5167 5168
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5169 5170 5171 5172

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

5173
	/* command should be marked inactive atomically with qc completion */
5174 5175 5176 5177
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
5178

5179 5180 5181 5182 5183
	/* 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;
5184
	ap->qc_active &= ~(1 << qc->tag);
5185

L
Linus Torvalds 已提交
5186
	/* call completion callback */
5187
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5188 5189
}

5190 5191 5192 5193 5194
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5195
	ap->ops->tf_read(ap, &qc->result_tf);
5196 5197
}

5198 5199 5200 5201 5202 5203 5204 5205 5206
/**
 *	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
5207
 *	spin_lock_irqsave(host lock)
5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226
 */
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) {
5227
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5228 5229 5230 5231 5232 5233 5234

		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 */
5235
				fill_result_tf(qc);
5236 5237 5238 5239 5240 5241 5242
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5243
			fill_result_tf(qc);
5244 5245 5246 5247 5248 5249 5250 5251

		__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)
5252
			fill_result_tf(qc);
5253 5254 5255 5256 5257

		__ata_qc_complete(qc);
	}
}

5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269
/**
 *	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
5270
 *	spin_lock_irqsave(host lock)
5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306
 *
 *	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
5307 5308 5309 5310 5311
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5312
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
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
	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
5341
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5342
 */
5343
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5344 5345 5346
{
	struct ata_port *ap = qc->ap;

5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360
	/* 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;
	}

5361
	qc->flags |= ATA_QCFLAG_ACTIVE;
5362
	ap->qc_active |= 1 << qc->tag;
5363

L
Linus Torvalds 已提交
5364 5365 5366
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5367
				goto sg_err;
L
Linus Torvalds 已提交
5368 5369
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5370
				goto sg_err;
L
Linus Torvalds 已提交
5371 5372 5373 5374 5375 5376 5377
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5378 5379 5380 5381
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5382

5383 5384
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5385 5386 5387
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398
}

/**
 *	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
5399 5400
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5401
 *	LOCKING:
J
Jeff Garzik 已提交
5402
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5403 5404
 *
 *	RETURNS:
5405
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5406 5407
 */

5408
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5409 5410 5411
{
	struct ata_port *ap = qc->ap;

5412 5413 5414 5415 5416 5417
	/* 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:
5418
		case ATA_PROT_NODATA:
5419 5420 5421 5422 5423 5424
		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)
5425
				/* see ata_dma_blacklisted() */
5426 5427 5428 5429 5430 5431 5432
				BUG();
			break;
		default:
			break;
		}
	}

5433
	/* select the device */
L
Linus Torvalds 已提交
5434 5435
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5436
	/* start the command */
L
Linus Torvalds 已提交
5437 5438
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5439 5440 5441
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5442
		ata_tf_to_host(ap, &qc->tf);
5443 5444 5445
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5446
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5447

L
Linus Torvalds 已提交
5448 5449 5450
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5451
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5452

L
Linus Torvalds 已提交
5453 5454 5455
		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 */
5456
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5457 5458
		break;

5459 5460 5461
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5462

J
Jeff Garzik 已提交
5463
		ata_tf_to_host(ap, &qc->tf);
5464

5465 5466 5467
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5468
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5469 5470

			/* always send first data block using
5471
			 * the ata_pio_task() codepath.
5472
			 */
5473
		} else {
5474 5475 5476 5477
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5478
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5479 5480 5481 5482

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5483 5484
		}

L
Linus Torvalds 已提交
5485 5486 5487 5488
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5489 5490 5491
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5492
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5493

5494 5495 5496 5497 5498
		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))
5499
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5500 5501 5502
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5503
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5504

L
Linus Torvalds 已提交
5505 5506
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5507 5508 5509 5510
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5511
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5512 5513 5514 5515
		break;

	default:
		WARN_ON(1);
5516
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531
	}

	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
5532
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5533 5534 5535 5536 5537 5538 5539 5540
 *
 *	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)
{
5541
	struct ata_eh_info *ehi = &ap->eh_info;
5542
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5543

5544
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5545
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5546

5547 5548 5549
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5550 5551 5552
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5553

5554 5555 5556 5557 5558
		/* 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
5559 5560
			goto idle_irq;
		break;
5561 5562 5563 5564 5565
	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
5566 5567
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5568 5569 5570 5571 5572 5573 5574

			/* 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);
5575 5576 5577 5578 5579 5580

			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;
			}
5581 5582 5583 5584
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5585 5586 5587 5588
	default:
		goto idle_irq;
	}

5589 5590 5591 5592
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5593

5594 5595 5596 5597
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5598

5599 5600
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5601

5602
	ata_hsm_move(ap, qc, status, 0);
5603 5604 5605 5606 5607

	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
5608 5609 5610 5611 5612 5613 5614
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5615
		ap->ops->irq_ack(ap, 0); /* debug trap */
5616
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5617
		return 1;
L
Linus Torvalds 已提交
5618 5619 5620 5621 5622 5623 5624
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5625
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5626
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5627
 *
J
Jeff Garzik 已提交
5628 5629 5630
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5631
 *	LOCKING:
J
Jeff Garzik 已提交
5632
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5633 5634
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5635
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5636 5637
 */

5638
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5639
{
J
Jeff Garzik 已提交
5640
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5641 5642 5643 5644 5645
	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
5646
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5647

J
Jeff Garzik 已提交
5648
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5649 5650
		struct ata_port *ap;

J
Jeff Garzik 已提交
5651
		ap = host->ports[i];
5652
		if (ap &&
J
Jeff Garzik 已提交
5653
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5654 5655 5656
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5657
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5658
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5659 5660 5661 5662
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5663
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5664 5665 5666 5667

	return IRQ_RETVAL(handled);
}

5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804
/**
 *	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
5805

5806
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5807
{
5808
	unsigned int err_mask;
J
Jens Axboe 已提交
5809 5810 5811 5812 5813
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5814
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5815 5816 5817 5818
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5819 5820 5821 5822 5823 5824 5825
	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
5826 5827
}

5828
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5829 5830 5831
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5832 5833 5834 5835
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5836 5837
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876

		/* 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
5877 5878
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5879 5880
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5881
 *	Suspend @host.  Actual operation is performed by EH.  This
5882 5883 5884 5885 5886 5887 5888 5889 5890
 *	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
5891
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5892
{
5893
	int rc;
5894

J
Jeff Garzik 已提交
5895
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5896 5897
	if (rc == 0)
		host->dev->power.power_state = mesg;
5898 5899 5900 5901
	return rc;
}

/**
J
Jeff Garzik 已提交
5902 5903
 *	ata_host_resume - resume host
 *	@host: host to resume
5904
 *
J
Jeff Garzik 已提交
5905
 *	Resume @host.  Actual operation is performed by EH.  This
5906 5907 5908 5909 5910 5911
 *	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
5912
void ata_host_resume(struct ata_host *host)
5913
{
J
Jeff Garzik 已提交
5914 5915 5916
	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;
5917
}
5918
#endif
5919

5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931
/**
 *	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.
 */
5932
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5933
{
5934
	struct device *dev = ap->dev;
5935
	int rc;
L
Linus Torvalds 已提交
5936

5937 5938
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5939 5940 5941
	if (!ap->prd)
		return -ENOMEM;

5942
	rc = ata_pad_alloc(ap, dev);
5943
	if (rc)
5944
		return rc;
L
Linus Torvalds 已提交
5945

5946 5947
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5948 5949 5950
	return 0;
}

5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962
/**
 *	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;
5963 5964
	unsigned long flags;

5965 5966 5967
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5968 5969
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5970
	 * host lock.
5971
	 */
5972
	spin_lock_irqsave(ap->lock, flags);
5973
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5974
	spin_unlock_irqrestore(ap->lock, flags);
5975

5976 5977
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5978 5979 5980 5981 5982
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5983
/**
5984 5985
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5986
 *
5987 5988 5989 5990
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5991
 *
L
Linus Torvalds 已提交
5992
 *	LOCKING:
5993
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5994
 */
5995
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5996
{
5997
	struct ata_port *ap;
L
Linus Torvalds 已提交
5998 5999
	unsigned int i;

6000 6001 6002 6003 6004 6005
	DPRINTK("ENTER\n");

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

6006
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6007
	ap->lock = &host->lock;
6008
	ap->flags = ATA_FLAG_DISABLED;
6009
	ap->print_id = -1;
L
Linus Torvalds 已提交
6010
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6011
	ap->host = host;
6012 6013
	ap->dev = host->dev;

6014
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
6015 6016
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
6017 6018 6019 6020 6021 6022

#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
6023
#else
6024
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6025
#endif
L
Linus Torvalds 已提交
6026

6027 6028 6029
	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);
6030
	INIT_LIST_HEAD(&ap->eh_done_q);
6031
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
6032

6033 6034
	ap->cbl = ATA_CBL_NONE;

6035 6036
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
6037
		dev->ap = ap;
6038
		dev->devno = i;
6039
		ata_dev_init(dev);
6040
	}
L
Linus Torvalds 已提交
6041 6042 6043 6044 6045 6046 6047 6048

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

6049 6050 6051 6052 6053 6054 6055 6056
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];

6057 6058 6059 6060
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6061 6062 6063
			ap->ops->port_stop(ap);
	}

6064
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6065
		host->ops->host_stop(host);
6066

6067 6068 6069
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6070 6071 6072 6073
		if (!ap)
			continue;

		if (ap->scsi_host)
6074 6075
			scsi_host_put(ap->scsi_host);

6076
		kfree(ap);
6077 6078 6079
		host->ports[i] = NULL;
	}

6080
	dev_set_drvdata(gendev, NULL);
6081 6082
}

6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

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

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

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

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

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

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

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

	devres_remove_group(dev, NULL);
	return host;

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

6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

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

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

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

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

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

	return host;
}

6197 6198 6199 6200 6201 6202 6203
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
6204 6205
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
	int i, rc;

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

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

6223 6224 6225
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
				ata_port_printk(ap, KERN_ERR, "failed to "
						"start port (errno=%d)\n", rc);
				goto err_out;
			}
		}

		ata_eh_freeze_port(ap);
	}

	host->flags |= ATA_HOST_STARTED;
	return 0;

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

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

6251
/**
J
Jeff Garzik 已提交
6252 6253 6254 6255 6256
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6257 6258 6259 6260 6261
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6262
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6263 6264
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6265
{
J
Jeff Garzik 已提交
6266 6267 6268 6269
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6270 6271
}

6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

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

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

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

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

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

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

		/* init sata_spd_limit to the current value */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
6329 6330
			if (spd)
				ap->hw_sata_spd_limit &= (1 << spd) - 1;
6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

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

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

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

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

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

			ata_port_probe(ap);

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

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

6376
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410
			ap->pflags |= ATA_PFLAG_LOADING;
			ata_port_schedule_eh(ap);

			spin_unlock_irqrestore(ap->lock, flags);

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

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

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

		ata_scsi_scan_host(ap);
	}

	return 0;
}

6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
	int rc;

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

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

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

6450 6451 6452
	/* Used to print device info at probe */
	host->irq = irq;

6453 6454 6455
	return rc;
}

6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472
/**
 *	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)
6473
		goto skip_eh;
6474 6475

	/* tell EH we're leaving & flush EH */
6476
	spin_lock_irqsave(ap->lock, flags);
6477
	ap->pflags |= ATA_PFLAG_UNLOADING;
6478
	spin_unlock_irqrestore(ap->lock, flags);
6479 6480 6481 6482 6483 6484

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6485
	spin_lock_irqsave(ap->lock, flags);
6486 6487 6488 6489

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

6490
	spin_unlock_irqrestore(ap->lock, flags);
6491 6492 6493 6494 6495

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6496
	spin_lock_irqsave(ap->lock, flags);
6497
	ata_port_freeze(ap);	/* won't be thawed */
6498
	spin_unlock_irqrestore(ap->lock, flags);
6499 6500 6501 6502 6503 6504

	ata_port_wait_eh(ap);

	/* Flush hotplug task.  The sequence is similar to
	 * ata_port_flush_task().
	 */
6505
	cancel_work_sync(&ap->hotplug_task.work); /* akpm: why? */
6506
	cancel_delayed_work(&ap->hotplug_task);
6507
	cancel_work_sync(&ap->hotplug_task.work);
6508

6509
 skip_eh:
6510
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6511
	scsi_remove_host(ap->scsi_host);
6512 6513
}

T
Tejun Heo 已提交
6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
}

L
Linus Torvalds 已提交
6531 6532 6533
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6534 6535 6536 6537 6538 6539 6540
 *
 *	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
6541
 */
E
Edward Falk 已提交
6542

L
Linus Torvalds 已提交
6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556
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
6557

6558 6559
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6560 6561 6562 6563
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6564 6565 6566
 *	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
6567 6568 6569 6570
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6571
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6572 6573
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6574
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6575

T
Tejun Heo 已提交
6576
	ata_host_detach(host);
L
Linus Torvalds 已提交
6577 6578 6579
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6580
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611
{
	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
6612

6613
#ifdef CONFIG_PM
6614
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6615 6616
{
	pci_save_state(pdev);
6617
	pci_disable_device(pdev);
6618

6619
	if (mesg.event == PM_EVENT_SUSPEND)
6620
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6621 6622
}

6623
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6624
{
6625 6626
	int rc;

J
Jens Axboe 已提交
6627 6628
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6629

T
Tejun Heo 已提交
6630
	rc = pcim_enable_device(pdev);
6631 6632 6633 6634 6635 6636
	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
6637
	pci_set_master(pdev);
6638
	return 0;
6639 6640
}

6641
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6642
{
J
Jeff Garzik 已提交
6643
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6644 6645
	int rc = 0;

J
Jeff Garzik 已提交
6646
	rc = ata_host_suspend(host, mesg);
6647 6648 6649
	if (rc)
		return rc;

6650
	ata_pci_device_do_suspend(pdev, mesg);
6651 6652 6653 6654 6655 6656

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6657
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6658
	int rc;
6659

6660 6661 6662 6663
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6664
}
6665 6666
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6667 6668 6669 6670 6671
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6672
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6673 6674 6675 6676
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6677 6678 6679 6680 6681 6682
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6683 6684 6685 6686 6687 6688 6689
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6690
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6691 6692
}

6693
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6694 6695
module_exit(ata_exit);

6696
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6697
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716

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;
}

6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762
/**
 *	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
6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795
/*
 * 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,
};

6796 6797 6798 6799
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6800 6801 6802 6803 6804 6805 6806
/*
 * 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.
 */

6807 6808 6809
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
6810
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6811
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
6812 6813
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6814
EXPORT_SYMBOL_GPL(ata_host_init);
6815
EXPORT_SYMBOL_GPL(ata_host_alloc);
6816
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6817
EXPORT_SYMBOL_GPL(ata_host_start);
6818
EXPORT_SYMBOL_GPL(ata_host_register);
6819
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6820
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6821 6822
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6823
EXPORT_SYMBOL_GPL(ata_hsm_move);
6824
EXPORT_SYMBOL_GPL(ata_qc_complete);
6825
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6826 6827 6828 6829 6830
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);
6831
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6832 6833 6834 6835 6836 6837
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);
6838
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
6839
EXPORT_SYMBOL_GPL(ata_interrupt);
6840
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
6841 6842
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6843
EXPORT_SYMBOL_GPL(ata_qc_prep);
6844
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6845 6846 6847 6848 6849
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);
6850 6851 6852 6853 6854
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
6855
EXPORT_SYMBOL_GPL(ata_port_probe);
6856
EXPORT_SYMBOL_GPL(ata_dev_disable);
6857
EXPORT_SYMBOL_GPL(sata_set_spd);
6858 6859
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6860 6861 6862
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6863
EXPORT_SYMBOL_GPL(ata_std_prereset);
6864
EXPORT_SYMBOL_GPL(ata_std_softreset);
6865
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6866 6867
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6868 6869
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6870
EXPORT_SYMBOL_GPL(ata_port_disable);
6871
EXPORT_SYMBOL_GPL(ata_ratelimit);
6872
EXPORT_SYMBOL_GPL(ata_wait_register);
6873
EXPORT_SYMBOL_GPL(ata_busy_sleep);
6874
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
6875
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6876 6877 6878
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6879
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6880
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6881
EXPORT_SYMBOL_GPL(ata_host_intr);
6882 6883 6884 6885 6886 6887
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);
6888
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6889 6890
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6891
#endif /* CONFIG_PM */
6892 6893
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6894
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
6895
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6896 6897
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6898
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6899 6900 6901
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6902 6903
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6904
EXPORT_SYMBOL_GPL(ata_pci_init_native_host);
T
Tejun Heo 已提交
6905
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
6906
EXPORT_SYMBOL_GPL(ata_pci_prepare_native_host);
L
Linus Torvalds 已提交
6907 6908
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6909
#ifdef CONFIG_PM
6910 6911
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6912 6913
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6914
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6915 6916
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6917
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6918

6919
EXPORT_SYMBOL_GPL(ata_eng_timeout);
6920 6921
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6922 6923 6924
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6925 6926
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6927
EXPORT_SYMBOL_GPL(ata_do_eh);
6928 6929 6930 6931
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
6932
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6933 6934 6935 6936 6937

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