libata-core.c 157.3 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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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
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static unsigned int ata_unique_id = 1;
static struct workqueue_struct *ata_wq;

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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/**
 *	ata_pio_devchk - PATA device presence detection
 *	@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.
 */

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

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

	outb(0x55, ioaddr->nsect_addr);
	outb(0xaa, ioaddr->lbal_addr);

	outb(0xaa, ioaddr->nsect_addr);
	outb(0x55, ioaddr->lbal_addr);

	outb(0x55, ioaddr->nsect_addr);
	outb(0xaa, ioaddr->lbal_addr);

	nsect = inb(ioaddr->nsect_addr);
	lbal = inb(ioaddr->lbal_addr);

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_mmio_devchk - PATA device presence detection
 *	@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.
 */

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

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

	writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
	writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);

	writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
	writeb(0x55, (void __iomem *) ioaddr->lbal_addr);

	writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
	writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);

	nsect = readb((void __iomem *) ioaddr->nsect_addr);
	lbal = readb((void __iomem *) ioaddr->lbal_addr);

	if ((nsect == 0x55) && (lbal == 0xaa))
		return 1;	/* we found a device */

	return 0;		/* nothing found */
}

/**
 *	ata_devchk - PATA device presence detection
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
 *
 *	Dispatch ATA device presence detection, depending
 *	on whether we are using PIO or MMIO to talk to the
 *	ATA shadow registers.
 *
 *	LOCKING:
 *	caller.
 */

static unsigned int ata_devchk(struct ata_port *ap,
				    unsigned int device)
{
	if (ap->flags & ATA_FLAG_MMIO)
		return ata_mmio_devchk(ap, device);
	return ata_pio_devchk(ap, device);
}

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

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

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

	ap->ops->tf_read(ap, &tf);
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	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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}

/**
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 *	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;
	}
}

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/**
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 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C 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 odd number.
 *
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 *	This function is identical to ata_id_string except that it
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 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
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void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
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{
	unsigned char *p;

	WARN_ON(!(len & 1));

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	ata_id_string(id, s, ofs, len - 1);
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	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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

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

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

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

	if (ap->flags & ATA_FLAG_MMIO) {
		writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
	} else {
		outb(tmp, ap->ioaddr.device_addr);
	}
	ata_pause(ap);		/* needed; also flushes, for mmio */
}

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

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

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

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

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

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

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

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

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	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
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	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

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

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	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
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		return;

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

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

	DPRINTK("ENTER\n");

1132
	spin_lock_irqsave(ap->lock, flags);
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	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
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	spin_unlock_irqrestore(ap->lock, flags);
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	DPRINTK("flush #1\n");
	flush_workqueue(ata_wq);

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

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

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void ata_qc_complete_internal(struct ata_queued_cmd *qc)
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{
1161
	struct completion *waiting = qc->private_data;
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	complete(waiting);
}

/**
1167
 *	ata_exec_internal_sg - execute libata internal command
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 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
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 *	@cdb: CDB for packet command
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 *	@dma_dir: Data tranfer direction of the command
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 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
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 *
 *	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.
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 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
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 */
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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)
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{
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	struct ata_port *ap = dev->ap;
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	u8 command = tf->command;
	struct ata_queued_cmd *qc;
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	unsigned int tag, preempted_tag;
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	u32 preempted_sactive, preempted_qc_active;
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	DECLARE_COMPLETION_ONSTACK(wait);
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	unsigned long flags;
1199
	unsigned int err_mask;
1200
	int rc;
1201

1202
	spin_lock_irqsave(ap->lock, flags);
1203

1204
	/* no internal command while frozen */
1205
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1206
		spin_unlock_irqrestore(ap->lock, flags);
1207 1208 1209
		return AC_ERR_SYSTEM;
	}

1210
	/* initialize internal qc */
1211

1212 1213 1214 1215 1216 1217 1218 1219 1220 1221
	/* 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;

1222
	if (test_and_set_bit(tag, &ap->qc_allocated))
1223
		BUG();
1224
	qc = __ata_qc_from_tag(ap, tag);
1225 1226 1227 1228 1229 1230 1231 1232

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

	preempted_tag = ap->active_tag;
1233 1234
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1235
	ap->active_tag = ATA_TAG_POISON;
1236 1237
	ap->sactive = 0;
	ap->qc_active = 0;
1238 1239

	/* prepare & issue qc */
1240
	qc->tf = *tf;
1241 1242
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1243
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1244 1245
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1246 1247 1248 1249 1250 1251
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1252
		qc->nsect = buflen / ATA_SECT_SIZE;
1253
		qc->nbytes = buflen;
1254 1255
	}

1256
	qc->private_data = &wait;
1257 1258
	qc->complete_fn = ata_qc_complete_internal;

1259
	ata_qc_issue(qc);
1260

1261
	spin_unlock_irqrestore(ap->lock, flags);
1262

A
Andrew Morton 已提交
1263
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1264 1265

	ata_port_flush_task(ap);
1266

1267
	if (!rc) {
1268
		spin_lock_irqsave(ap->lock, flags);
1269 1270 1271

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1272 1273
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1274
		 */
1275
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1276 1277 1278 1279 1280 1281
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1282

1283 1284
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1285
					"qc timeout (cmd 0x%x)\n", command);
1286 1287
		}

1288
		spin_unlock_irqrestore(ap->lock, flags);
1289 1290
	}

1291 1292 1293 1294 1295
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

	if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
1296
		if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1297
			ata_dev_printk(dev, KERN_WARNING,
1298
				"zero err_mask for failed "
T
Tejun Heo 已提交
1299
				"internal command, assuming AC_ERR_OTHER\n");
1300 1301 1302
		qc->err_mask |= AC_ERR_OTHER;
	}

1303
	/* finish up */
1304
	spin_lock_irqsave(ap->lock, flags);
1305

1306
	*tf = qc->result_tf;
1307 1308 1309
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1310
	ap->active_tag = preempted_tag;
1311 1312
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1313

1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
	/* 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.
	 */
1325
	if (ap->flags & ATA_FLAG_DISABLED) {
1326 1327 1328 1329
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1330
	spin_unlock_irqrestore(ap->lock, flags);
1331

1332
	return err_mask;
1333 1334
}

1335
/**
1336
 *	ata_exec_internal - execute libata internal command
1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
 *	@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)
{
1357 1358
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1359

1360 1361 1362 1363 1364 1365
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1366

1367
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1368 1369
}

1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
/**
 *	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
1383
 */
1384
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1385 1386 1387 1388 1389 1390 1391 1392 1393
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1394
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1395 1396
}

1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */

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

	if (speed < 2)
		return 0;
	if (speed > 2)
		return 1;
1414

1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
	/* If we have no drive specific rule, then PIO 2 is non IORDY */

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

L
Linus Torvalds 已提交
1430
/**
1431 1432 1433
 *	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)
1434
 *	@flags: ATA_READID_* flags
1435
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1436
 *
1437 1438
 *	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
1439 1440
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1441 1442
 *
 *	LOCKING:
1443 1444 1445 1446
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1447
 */
1448
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1449
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1450
{
T
Tejun Heo 已提交
1451
	struct ata_port *ap = dev->ap;
1452
	unsigned int class = *p_class;
1453
	struct ata_taskfile tf;
1454 1455 1456
	unsigned int err_mask = 0;
	const char *reason;
	int rc;
L
Linus Torvalds 已提交
1457

1458
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1459 1460
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1461

1462
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
L
Linus Torvalds 已提交
1463

1464
 retry:
T
Tejun Heo 已提交
1465
	ata_tf_init(dev, &tf);
1466

1467 1468
	switch (class) {
	case ATA_DEV_ATA:
1469
		tf.command = ATA_CMD_ID_ATA;
1470 1471
		break;
	case ATA_DEV_ATAPI:
1472
		tf.command = ATA_CMD_ID_ATAPI;
1473 1474 1475 1476 1477
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1478 1479
	}

1480
	tf.protocol = ATA_PROT_PIO;
1481
	tf.flags |= ATA_TFLAG_POLLING; /* for polling presence detection */
L
Linus Torvalds 已提交
1482

T
Tejun Heo 已提交
1483
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1484
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1485
	if (err_mask) {
1486
		if (err_mask & AC_ERR_NODEV_HINT) {
1487 1488 1489 1490 1491
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
				ap->id, dev->devno);
			return -ENOENT;
		}

1492 1493
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1494 1495 1496
		goto err_out;
	}

1497
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1498

1499
	/* sanity check */
1500 1501 1502 1503 1504 1505 1506 1507 1508
	rc = -EINVAL;
	reason = "device reports illegal type";

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1509 1510
	}

1511
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1512 1513 1514 1515 1516 1517 1518 1519 1520
		/*
		 * 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
1521
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1522 1523 1524 1525 1526 1527 1528 1529 1530
			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.
			 */
1531
			flags &= ~ATA_READID_POSTRESET;
1532 1533 1534 1535 1536
			goto retry;
		}
	}

	*p_class = class;
1537

1538 1539 1540
	return 0;

 err_out:
T
Tejun Heo 已提交
1541
	if (ata_msg_warn(ap))
1542
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1543
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1544 1545 1546
	return rc;
}

T
Tejun Heo 已提交
1547
static inline u8 ata_dev_knobble(struct ata_device *dev)
1548
{
T
Tejun Heo 已提交
1549
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1550 1551
}

1552 1553 1554 1555 1556 1557 1558 1559 1560 1561
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;
	}
1562 1563 1564 1565
	if (ata_device_blacklisted(dev) & ATA_HORKAGE_NONCQ) {
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1566
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1567
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1568 1569 1570 1571 1572 1573 1574 1575 1576
		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);
}

1577 1578 1579 1580
static void ata_set_port_max_cmd_len(struct ata_port *ap)
{
	int i;

J
Jeff Garzik 已提交
1581 1582 1583
	if (ap->scsi_host) {
		unsigned int len = 0;

1584
		for (i = 0; i < ATA_MAX_DEVICES; i++)
J
Jeff Garzik 已提交
1585 1586 1587
			len = max(len, ap->device[i].cdb_len);

		ap->scsi_host->max_cmd_len = len;
1588 1589 1590
	}
}

1591
/**
1592 1593 1594 1595 1596
 *	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.
1597 1598
 *
 *	LOCKING:
1599 1600 1601 1602
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1603
 */
1604
int ata_dev_configure(struct ata_device *dev)
1605
{
T
Tejun Heo 已提交
1606
	struct ata_port *ap = dev->ap;
1607
	int print_info = ap->eh_context.i.flags & ATA_EHI_PRINTINFO;
1608
	const u16 *id = dev->id;
1609
	unsigned int xfer_mask;
1610
	char revbuf[7];		/* XYZ-99\0 */
1611
	int rc;
1612

1613
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1614 1615 1616
		ata_dev_printk(dev, KERN_INFO,
			       "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
			       __FUNCTION__, ap->id, dev->devno);
1617
		return 0;
1618 1619
	}

1620
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1621 1622
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
			       __FUNCTION__, ap->id, dev->devno);
L
Linus Torvalds 已提交
1623

1624
	/* print device capabilities */
1625
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1626 1627 1628
		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",
1629
			       __FUNCTION__,
1630 1631
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1632

1633
	/* initialize to-be-configured parameters */
1634
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1635 1636 1637 1638 1639 1640 1641
	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
1642 1643 1644 1645
	/*
	 * common ATA, ATAPI feature tests
	 */

1646
	/* find max transfer mode; for printk only */
1647
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1648

1649 1650
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1651 1652 1653

	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1654 1655 1656 1657 1658 1659 1660 1661 1662
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
				ata_dev_printk(dev, KERN_WARNING, "ata%u: device %u  supports DRM functions and may not be fully accessable.\n",
					ap->id, dev->devno);
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1663
		dev->n_sectors = ata_id_n_sectors(id);
1664

1665
		if (ata_id_has_lba(id)) {
1666
			const char *lba_desc;
1667
			char ncq_desc[20];
1668

1669 1670
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1671
			if (ata_id_has_lba48(id)) {
1672
				dev->flags |= ATA_DFLAG_LBA48;
1673
				lba_desc = "LBA48";
1674 1675 1676 1677

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1678
			}
1679

1680 1681 1682
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1683
			/* print device info to dmesg */
1684
			if (ata_msg_drv(ap) && print_info)
1685
				ata_dev_printk(dev, KERN_INFO, "%s, "
1686
					"max %s, %Lu sectors: %s %s\n",
1687
					revbuf,
1688 1689
					ata_mode_string(xfer_mask),
					(unsigned long long)dev->n_sectors,
1690
					lba_desc, ncq_desc);
1691
		} else {
1692 1693 1694
			/* CHS */

			/* Default translation */
1695 1696 1697
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1698

1699
			if (ata_id_current_chs_valid(id)) {
1700
				/* Current CHS translation is valid. */
1701 1702 1703
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1704 1705 1706
			}

			/* print device info to dmesg */
1707
			if (ata_msg_drv(ap) && print_info)
1708
				ata_dev_printk(dev, KERN_INFO, "%s, "
1709
					"max %s, %Lu sectors: CHS %u/%u/%u\n",
1710
					revbuf,
1711 1712
					ata_mode_string(xfer_mask),
					(unsigned long long)dev->n_sectors,
T
Tejun Heo 已提交
1713 1714
					dev->cylinders, dev->heads,
					dev->sectors);
L
Linus Torvalds 已提交
1715 1716
		}

1717 1718
		if (dev->id[59] & 0x100) {
			dev->multi_count = dev->id[59] & 0xff;
1719
			if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1720 1721 1722
				ata_dev_printk(dev, KERN_INFO,
					"ata%u: dev %u multi count %u\n",
					ap->id, dev->devno, dev->multi_count);
1723 1724
		}

1725
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1726 1727 1728
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1729
	else if (dev->class == ATA_DEV_ATAPI) {
1730 1731
		char *cdb_intr_string = "";

1732
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1733
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1734
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1735 1736
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1737
			rc = -EINVAL;
L
Linus Torvalds 已提交
1738 1739
			goto err_out_nosup;
		}
1740
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1741

1742
		if (ata_id_cdb_intr(dev->id)) {
1743
			dev->flags |= ATA_DFLAG_CDB_INTR;
1744 1745
			cdb_intr_string = ", CDB intr";
		}
1746

L
Linus Torvalds 已提交
1747
		/* print device info to dmesg */
1748
		if (ata_msg_drv(ap) && print_info)
T
Tejun Heo 已提交
1749 1750 1751
			ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1752 1753
	}

1754 1755 1756 1757 1758
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770
	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");
		}
	}

1771
	ata_set_port_max_cmd_len(ap);
1772

1773
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
1774
	if (ata_dev_knobble(dev)) {
1775
		if (ata_msg_drv(ap) && print_info)
1776 1777
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
1778
		dev->udma_mask &= ATA_UDMA5;
1779 1780 1781 1782 1783 1784
		dev->max_sectors = ATA_MAX_SECTORS;
	}

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

1785 1786 1787
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
1788
	return 0;
L
Linus Torvalds 已提交
1789 1790

err_out_nosup:
1791
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1792 1793
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
1794
	return rc;
L
Linus Torvalds 已提交
1795 1796 1797 1798 1799 1800
}

/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
1801 1802 1803 1804
 *	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
1805
 *	LOCKING:
J
Jeff Garzik 已提交
1806
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1807 1808
 *
 *	RETURNS:
1809
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
1810 1811
 */

1812
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
1813
{
1814
	unsigned int classes[ATA_MAX_DEVICES];
1815 1816
	int tries[ATA_MAX_DEVICES];
	int i, rc, down_xfermask;
1817
	struct ata_device *dev;
L
Linus Torvalds 已提交
1818

1819
	ata_port_probe(ap);
1820

1821 1822 1823 1824 1825 1826
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
	down_xfermask = 0;

1827
	/* reset and determine device classes */
1828
	ap->ops->phy_reset(ap);
1829

1830 1831
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
1832

1833 1834 1835 1836 1837
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
1838

1839
		dev->class = ATA_DEV_UNKNOWN;
1840
	}
L
Linus Torvalds 已提交
1841

1842
	ata_port_probe(ap);
1843

A
Alan Cox 已提交
1844 1845 1846 1847 1848 1849
	/* 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;

1850
	/* read IDENTIFY page and configure devices */
L
Linus Torvalds 已提交
1851
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
1852
		dev = &ap->device[i];
1853

1854 1855
		if (tries[i])
			dev->class = classes[i];
1856

1857
		if (!ata_dev_enabled(dev))
1858 1859
			continue;

1860 1861
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
1862 1863 1864
		if (rc)
			goto fail;

1865 1866 1867
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
1868 1869
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
1870 1871
	}

1872
	/* configure transfer mode */
1873
	rc = ata_set_mode(ap, &dev);
1874 1875 1876
	if (rc) {
		down_xfermask = 1;
		goto fail;
1877
	}
L
Linus Torvalds 已提交
1878

1879 1880 1881
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
1882

1883 1884
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
1885
	ap->ops->port_disable(ap);
1886
	return -ENODEV;
1887 1888 1889 1890 1891 1892 1893 1894

 fail:
	switch (rc) {
	case -EINVAL:
	case -ENODEV:
		tries[dev->devno] = 0;
		break;
	case -EIO:
1895
		sata_down_spd_limit(ap);
1896 1897 1898 1899
		/* fall through */
	default:
		tries[dev->devno]--;
		if (down_xfermask &&
T
Tejun Heo 已提交
1900
		    ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
1901 1902 1903
			tries[dev->devno] = 0;
	}

1904
	if (!tries[dev->devno]) {
T
Tejun Heo 已提交
1905 1906
		ata_down_xfermask_limit(dev, 1);
		ata_dev_disable(dev);
1907 1908
	}

1909
	goto retry;
L
Linus Torvalds 已提交
1910 1911 1912
}

/**
J
Jeff Garzik 已提交
1913 1914
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
1915
 *
J
Jeff Garzik 已提交
1916 1917 1918
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
1919
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
1920
 *	serialization.
L
Linus Torvalds 已提交
1921 1922 1923 1924
 */

void ata_port_probe(struct ata_port *ap)
{
1925
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
1926 1927
}

1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938
/**
 *	sata_print_link_status - Print SATA link status
 *	@ap: SATA port to printk link status about
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
static void sata_print_link_status(struct ata_port *ap)
{
1939
	u32 sstatus, scontrol, tmp;
1940

1941
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
1942
		return;
1943
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
1944

1945
	if (ata_port_online(ap)) {
1946
		tmp = (sstatus >> 4) & 0xf;
1947 1948 1949
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
1950
	} else {
1951 1952 1953
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
1954 1955 1956
	}
}

L
Linus Torvalds 已提交
1957
/**
J
Jeff Garzik 已提交
1958 1959
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
1960
 *
J
Jeff Garzik 已提交
1961 1962 1963
 *	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
1964 1965
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1966
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
1967 1968 1969 1970 1971 1972 1973 1974
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
1975
		/* issue phy wake/reset */
1976
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
1977 1978 1979
		/* 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
1980
	}
1981 1982
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
1983 1984 1985 1986

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
1987
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
1988 1989 1990 1991
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

1992 1993
	/* print link status */
	sata_print_link_status(ap);
1994

1995
	/* TODO: phy layer with polling, timeouts, etc. */
1996
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
1997
		ata_port_probe(ap);
1998
	else
L
Linus Torvalds 已提交
1999 2000
		ata_port_disable(ap);

2001
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
		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
2013 2014
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2015
 *
J
Jeff Garzik 已提交
2016 2017
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2018 2019
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2020
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2021 2022 2023 2024 2025
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2026
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2027 2028 2029 2030
		return;
	ata_bus_reset(ap);
}

2031 2032 2033 2034 2035 2036 2037
/**
 *	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
 */
2038

T
Tejun Heo 已提交
2039
struct ata_device *ata_dev_pair(struct ata_device *adev)
2040
{
T
Tejun Heo 已提交
2041
	struct ata_port *ap = adev->ap;
2042
	struct ata_device *pair = &ap->device[1 - adev->devno];
2043
	if (!ata_dev_enabled(pair))
2044 2045 2046 2047
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2048
/**
J
Jeff Garzik 已提交
2049 2050
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2051
 *
J
Jeff Garzik 已提交
2052 2053 2054 2055 2056
 *	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
2057
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2058
 *	serialization.
L
Linus Torvalds 已提交
2059 2060 2061 2062 2063 2064
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2065
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2066 2067
}

2068
/**
2069
 *	sata_down_spd_limit - adjust SATA spd limit downward
2070 2071 2072 2073
 *	@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
2074
 *	using sata_set_spd().
2075 2076 2077 2078 2079 2080 2081
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2082
int sata_down_spd_limit(struct ata_port *ap)
2083
{
2084 2085
	u32 sstatus, spd, mask;
	int rc, highbit;
2086

2087 2088 2089
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2090 2091 2092 2093 2094 2095 2096

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

2097
	spd = (sstatus >> 4) & 0xf;
2098 2099 2100 2101 2102 2103 2104 2105 2106
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2107 2108
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2109 2110 2111 2112

	return 0;
}

2113
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128
{
	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;
}

/**
2129
 *	sata_set_spd_needed - is SATA spd configuration needed
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142
 *	@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.
 */
2143
int sata_set_spd_needed(struct ata_port *ap)
2144 2145 2146
{
	u32 scontrol;

2147
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2148 2149
		return 0;

2150
	return __sata_set_spd_needed(ap, &scontrol);
2151 2152 2153
}

/**
2154
 *	sata_set_spd - set SATA spd according to spd limit
2155 2156 2157 2158 2159 2160 2161 2162 2163
 *	@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
2164
 *	changed.  Negative errno if SCR registers are inaccessible.
2165
 */
2166
int sata_set_spd(struct ata_port *ap)
2167 2168
{
	u32 scontrol;
2169
	int rc;
2170

2171 2172
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2173

2174
	if (!__sata_set_spd_needed(ap, &scontrol))
2175 2176
		return 0;

2177 2178 2179
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2180 2181 2182
	return 1;
}

A
Alan Cox 已提交
2183 2184 2185 2186 2187
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2188
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2189
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2190 2191 2192
 * 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
2193 2194 2195 2196 2197 2198 2199 2200 2201
 */

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 },

2202 2203
	{ 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
2204 2205 2206 2207 2208
	{ 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 }, */
2209

A
Alan Cox 已提交
2210 2211 2212
	{ 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 },
2213

A
Alan Cox 已提交
2214 2215 2216 2217
	{ 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 },

2218 2219
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
A
Alan Cox 已提交
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
	{ 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
2265
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2266
			return NULL;
2267
	return t;
A
Alan Cox 已提交
2268 2269 2270 2271 2272 2273 2274 2275 2276
}

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;

	/*
2277
	 * Find the mode.
2278
	 */
A
Alan Cox 已提交
2279 2280 2281 2282

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

2283 2284
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304
	/*
	 * 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.
	 */

2305
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2306 2307

	/*
2308 2309 2310
	 * 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
2311 2312
	 */

2313
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2314 2315 2316 2317 2318
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2319
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
	 */

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

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

	return 0;
}

2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
 *	@force_pio0: Force PIO0
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
T
Tejun Heo 已提交
2350
int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
{
	unsigned long xfer_mask;
	int highbit;

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

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

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

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

2374 2375
	ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
		       ata_mode_string(xfer_mask));
2376 2377 2378 2379 2380 2381 2382

	return 0;

 fail:
	return -EINVAL;
}

T
Tejun Heo 已提交
2383
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2384
{
2385
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2386 2387
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2388

2389
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2390 2391 2392
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2393
	err_mask = ata_dev_set_xfermode(dev);
2394
	if (err_mask) {
2395 2396
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2397 2398
		return -EIO;
	}
L
Linus Torvalds 已提交
2399

2400
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2401
	rc = ata_dev_revalidate(dev, 0);
2402
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2403
	if (rc)
2404
		return rc;
2405

2406 2407
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2408

2409 2410
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2411
	return 0;
L
Linus Torvalds 已提交
2412 2413 2414 2415 2416
}

/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
2417
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2418
 *
2419 2420 2421
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2422
 *
L
Linus Torvalds 已提交
2423
 *	LOCKING:
J
Jeff Garzik 已提交
2424
 *	PCI/etc. bus probe sem.
2425 2426 2427
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2428
 */
2429
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2430
{
2431
	struct ata_device *dev;
2432
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2433

2434
	/* has private set_mode? */
A
Alan 已提交
2435 2436
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
2437

2438 2439
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2440
		unsigned int pio_mask, dma_mask;
2441

2442 2443
		dev = &ap->device[i];

2444
		if (!ata_dev_enabled(dev))
2445 2446
			continue;

T
Tejun Heo 已提交
2447
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2448

2449 2450 2451 2452
		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);
2453

2454
		found = 1;
2455 2456
		if (dev->dma_mode)
			used_dma = 1;
2457
	}
2458
	if (!found)
2459
		goto out;
2460 2461

	/* step 2: always set host PIO timings */
2462 2463 2464 2465 2466 2467
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2468
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2469
			rc = -EINVAL;
2470
			goto out;
2471 2472 2473 2474 2475 2476 2477
		}

		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
2478

2479
	/* step 3: set host DMA timings */
2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490
	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
2491 2492

	/* step 4: update devices' xfer mode */
2493
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2494
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2495

2496 2497
		/* don't udpate suspended devices' xfer mode */
		if (!ata_dev_ready(dev))
2498 2499
			continue;

T
Tejun Heo 已提交
2500
		rc = ata_dev_set_mode(dev);
2501
		if (rc)
2502
			goto out;
2503
	}
L
Linus Torvalds 已提交
2504

2505 2506
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2507
	 */
J
Jeff Garzik 已提交
2508 2509
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
		ap->host->simplex_claimed = 1;
2510

2511
	/* step5: chip specific finalisation */
L
Linus Torvalds 已提交
2512 2513 2514
	if (ap->ops->post_set_mode)
		ap->ops->post_set_mode(ap);

2515 2516 2517 2518
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2519 2520
}

2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
/**
 *	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
2531
 *	spin_lock_irqsave(host lock)
2532 2533 2534 2535 2536 2537 2538 2539 2540
 */

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
2541 2542 2543 2544 2545 2546
/**
 *	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
2547 2548 2549
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2550 2551 2552 2553 2554
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2555
 */
2556 2557
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2558 2559 2560 2561 2562 2563 2564
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2565 2566
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2567 2568 2569 2570
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2571
	if (status != 0xff && (status & ATA_BUSY))
2572
		ata_port_printk(ap, KERN_WARNING,
2573 2574
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2575 2576

	timeout = timer_start + tmout;
2577 2578
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2579 2580 2581 2582
		msleep(50);
		status = ata_chk_status(ap);
	}

2583 2584 2585
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2586
	if (status & ATA_BUSY) {
2587
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2588 2589
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2590
		return -EBUSY;
L
Linus Torvalds 已提交
2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671
	}

	return 0;
}

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

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

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

		ap->ops->dev_select(ap, 1);
		if (ap->flags & ATA_FLAG_MMIO) {
			nsect = readb((void __iomem *) ioaddr->nsect_addr);
			lbal = readb((void __iomem *) ioaddr->lbal_addr);
		} else {
			nsect = inb(ioaddr->nsect_addr);
			lbal = inb(ioaddr->lbal_addr);
		}
		if ((nsect == 1) && (lbal == 1))
			break;
		if (time_after(jiffies, timeout)) {
			dev1 = 0;
			break;
		}
		msleep(50);	/* give drive a breather */
	}
	if (dev1)
		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);

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

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

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

	/* software reset.  causes dev0 to be selected */
	if (ap->flags & ATA_FLAG_MMIO) {
		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
		udelay(20);	/* FIXME: flush */
		writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
		udelay(20);	/* FIXME: flush */
		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
	} else {
		outb(ap->ctl, ioaddr->ctl_addr);
		udelay(10);
		outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
		udelay(10);
		outb(ap->ctl, ioaddr->ctl_addr);
	}

	/* 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.
2672 2673
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
2674 2675 2676
	 */
	msleep(150);

2677
	/* Before we perform post reset processing we want to see if
2678 2679 2680
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
2681 2682
	if (ata_check_status(ap) == 0xFF)
		return 0;
2683

L
Linus Torvalds 已提交
2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701
	ata_bus_post_reset(ap, devmask);

	return 0;
}

/**
 *	ata_bus_reset - reset host port and associated ATA channel
 *	@ap: port to reset
 *
 *	This is typically the first time we actually start issuing
 *	commands to the ATA channel.  We wait for BSY to clear, then
 *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
 *	result.  Determine what devices, if any, are on the channel
 *	by looking at the device 0/1 error register.  Look at the signature
 *	stored in each device's taskfile registers, to determine if
 *	the device is ATA or ATAPI.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2702
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
2703
 *	Obtains host lock.
L
Linus Torvalds 已提交
2704 2705
 *
 *	SIDE EFFECTS:
2706
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
2707 2708 2709 2710 2711 2712 2713
 */

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
2714
	unsigned int dev0, dev1 = 0, devmask = 0;
L
Linus Torvalds 已提交
2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736

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

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

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

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

	/* issue bus reset */
	if (ap->flags & ATA_FLAG_SRST)
T
Tejun Heo 已提交
2737 2738
		if (ata_bus_softreset(ap, devmask))
			goto err_out;
L
Linus Torvalds 已提交
2739 2740 2741 2742

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
2743
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
2744
	if ((slave_possible) && (err != 0x81))
2745
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773

	/* re-enable interrupts */
	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
		ata_irq_on(ap);

	/* 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 */
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
		else
			outb(ap->ctl, ioaddr->ctl_addr);
	}

	DPRINTK("EXIT\n");
	return;

err_out:
2774
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
2775 2776 2777 2778 2779
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Make sure SStatus of @ap reaches stable state, determined by
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
 *	beginning of the stable state.  Because, after hot unplugging,
 *	DET gets stuck at 1 on some controllers, this functions waits
 *	until timeout then returns 0 if DET is stable at 1.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
2799
{
2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854
	unsigned long interval_msec = params[0];
	unsigned long duration = params[1] * HZ / 1000;
	unsigned long timeout = jiffies + params[2] * HZ / 1000;
	unsigned long last_jiffies;
	u32 last, cur;
	int rc;

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

	last = cur;
	last_jiffies = jiffies;

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

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

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

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

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
{
	u32 scontrol;
2855 2856 2857 2858
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2859

2860
	scontrol = (scontrol & 0x0f0) | 0x300;
2861 2862 2863

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
2864

2865 2866 2867 2868
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
2869

2870
	return sata_phy_debounce(ap, params);
2871 2872
}

2873 2874 2875 2876 2877 2878 2879 2880
static void ata_wait_spinup(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
	unsigned long end, secs;
	int rc;

	/* first, debounce phy if SATA */
	if (ap->cbl == ATA_CBL_SATA) {
2881
		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916

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

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

	if (time_after(jiffies, end))
		return;

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

	schedule_timeout_uninterruptible(end - jiffies);
}

/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
 *
 *	@ap is about to be reset.  Initialize it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_std_prereset(struct ata_port *ap)
{
	struct ata_eh_context *ehc = &ap->eh_context;
2917
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
2918 2919
	int rc;

2920 2921 2922 2923 2924 2925 2926 2927
	/* handle link resume & hotplug spinup */
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

	if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
	    (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
		ata_wait_spinup(ap);
2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952

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

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

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

	return 0;
}

2953 2954 2955 2956 2957
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
 *
2958
 *	Reset host port using ATA SRST.
2959 2960 2961 2962 2963 2964 2965
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
2966
int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
2967 2968 2969 2970 2971 2972 2973
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	unsigned int devmask = 0, err_mask;
	u8 err;

	DPRINTK("ENTER\n");

2974
	if (ata_port_offline(ap)) {
2975 2976 2977 2978
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991
	/* determine if device 0/1 are present */
	if (ata_devchk(ap, 0))
		devmask |= (1 << 0);
	if (slave_possible && ata_devchk(ap, 1))
		devmask |= (1 << 1);

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

	/* issue bus reset */
	DPRINTK("about to softreset, devmask=%x\n", devmask);
	err_mask = ata_bus_softreset(ap, devmask);
	if (err_mask) {
2992 2993
		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
				err_mask);
2994 2995 2996 2997 2998 2999 3000 3001
		return -EIO;
	}

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

3002
 out:
3003 3004 3005 3006 3007
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3008
 *	sata_port_hardreset - reset port via SATA phy reset
3009
 *	@ap: port to reset
3010
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3011 3012 3013 3014 3015 3016 3017 3018 3019
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3020
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing)
3021
{
3022
	u32 scontrol;
3023
	int rc;
3024

3025 3026
	DPRINTK("ENTER\n");

3027
	if (sata_set_spd_needed(ap)) {
3028 3029 3030 3031 3032
		/* 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.
		 */
3033
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3034
			goto out;
3035

3036
		scontrol = (scontrol & 0x0f0) | 0x304;
3037 3038

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3039
			goto out;
3040

3041
		sata_set_spd(ap);
3042 3043 3044
	}

	/* issue phy wake/reset */
3045
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3046
		goto out;
3047

3048
	scontrol = (scontrol & 0x0f0) | 0x301;
3049 3050

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3051
		goto out;
3052

3053
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3054 3055 3056 3057
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3058
	/* bring phy back */
3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
	rc = sata_phy_resume(ap, timing);
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

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

	DPRINTK("ENTER\n");

	/* do hardreset */
	rc = sata_port_hardreset(ap, timing);
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3093 3094

	/* TODO: phy layer with polling, timeouts, etc. */
3095
	if (ata_port_offline(ap)) {
3096 3097 3098 3099 3100 3101
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
3102 3103
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (device not ready)\n");
3104 3105 3106
		return -EIO;
	}

3107 3108
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128
	*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)
{
3129 3130
	u32 serror;

3131 3132 3133
	DPRINTK("ENTER\n");

	/* print link status */
3134
	sata_print_link_status(ap);
3135

3136 3137 3138 3139
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3140
	/* re-enable interrupts */
3141 3142 3143 3144 3145
	if (!ap->ops->error_handler) {
		/* FIXME: hack. create a hook instead */
		if (ap->ioaddr.ctl_addr)
			ata_irq_on(ap);
	}
3146 3147 3148 3149 3150 3151 3152

	/* 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);

3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165
	/* 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 */
	if (ap->ioaddr.ctl_addr) {
		if (ap->flags & ATA_FLAG_MMIO)
			writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
		else
			outb(ap->ctl, ap->ioaddr.ctl_addr);
	}
3166 3167 3168 3169

	DPRINTK("EXIT\n");
}

3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185
/**
 *	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
3186 3187
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3188 3189 3190 3191 3192 3193
{
	const u16 *old_id = dev->id;
	unsigned char model[2][41], serial[2][21];
	u64 new_n_sectors;

	if (dev->class != new_class) {
3194 3195
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3196 3197 3198 3199 3200 3201 3202 3203 3204 3205
		return 0;
	}

	ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
	new_n_sectors = ata_id_n_sectors(new_id);

	if (strcmp(model[0], model[1])) {
3206 3207
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3208 3209 3210 3211
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3212 3213
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3214 3215 3216 3217
		return 0;
	}

	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
3218 3219 3220 3221
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)dev->n_sectors,
			       (unsigned long long)new_n_sectors);
3222 3223 3224 3225 3226 3227 3228 3229 3230
		return 0;
	}

	return 1;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3231
 *	@readid_flags: read ID flags
3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
 *
 *	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
 */
3242
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
3243
{
3244
	unsigned int class = dev->class;
3245
	u16 *id = (void *)dev->ap->sector_buf;
3246 3247
	int rc;

3248 3249 3250 3251
	if (!ata_dev_enabled(dev)) {
		rc = -ENODEV;
		goto fail;
	}
3252

3253
	/* read ID data */
3254
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3255 3256 3257 3258
	if (rc)
		goto fail;

	/* is the device still there? */
T
Tejun Heo 已提交
3259
	if (!ata_dev_same_device(dev, class, id)) {
3260 3261 3262 3263
		rc = -ENODEV;
		goto fail;
	}

3264
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3265 3266

	/* configure device according to the new ID */
3267
	rc = ata_dev_configure(dev);
3268 3269
	if (rc == 0)
		return 0;
3270 3271

 fail:
3272
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3273 3274 3275
	return rc;
}

3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

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

	/* Devices we expect to fail diagnostics */

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

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3325
};
3326

3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337
static int ata_strim(char *s, size_t len)
{
	len = strnlen(s, len);

	/* ATAPI specifies that empty space is blank-filled; remove blanks */
	while ((len > 0) && (s[len - 1] == ' ')) {
		len--;
		s[len] = 0;
	}
	return len;
}
L
Linus Torvalds 已提交
3338

3339
unsigned long ata_device_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3340
{
3341 3342 3343
	unsigned char model_num[40];
	unsigned char model_rev[16];
	unsigned int nlen, rlen;
3344
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3345

3346 3347 3348 3349 3350 3351
	ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
			  sizeof(model_num));
	ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
			  sizeof(model_rev));
	nlen = ata_strim(model_num, sizeof(model_num));
	rlen = ata_strim(model_rev, sizeof(model_rev));
L
Linus Torvalds 已提交
3352

3353 3354 3355 3356 3357 3358
	while (ad->model_num) {
		if (!strncmp(ad->model_num, model_num, nlen)) {
			if (ad->model_rev == NULL)
				return ad->horkage;
			if (!strncmp(ad->model_rev, model_rev, rlen))
				return ad->horkage;
3359
		}
3360
		ad++;
3361
	}
L
Linus Torvalds 已提交
3362 3363 3364
	return 0;
}

3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376
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;
}

3377 3378 3379 3380
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3381 3382 3383 3384
 *	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...
3385 3386 3387 3388
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3389
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3390
{
T
Tejun Heo 已提交
3391
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3392
	struct ata_host *host = ap->host;
3393
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3394

3395
	/* controller modes available */
3396 3397 3398 3399 3400 3401 3402 3403
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 */
	if (ap->cbl == ATA_CBL_PATA40)
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
3404 3405 3406 3407 3408 3409 3410
	/* Apply drive side cable rule. Unknown or 80 pin cables reported
	 * host side are checked drive side as well. Cases where we know a
	 * 40wire cable is used safely for 80 are not checked here.
	 */
        if (ata_drive_40wire(dev->id) && (ap->cbl == ATA_CBL_PATA_UNK || ap->cbl == ATA_CBL_PATA80))
		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);

L
Linus Torvalds 已提交
3411

3412 3413 3414
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3415

3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426
	/*
	 *	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));
	}

3427 3428
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3429 3430
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3431
	}
3432

J
Jeff Garzik 已提交
3433
	if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed) {
3434 3435 3436
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3437
	}
3438

3439 3440 3441
	if (ap->ops->mode_filter)
		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);

3442 3443
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3444 3445 3446 3447 3448 3449
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3450 3451 3452
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3453
 *	LOCKING:
J
Jeff Garzik 已提交
3454
 *	PCI/etc. bus probe sem.
3455 3456 3457
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3458 3459
 */

T
Tejun Heo 已提交
3460
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3461
{
3462
	struct ata_taskfile tf;
3463
	unsigned int err_mask;
L
Linus Torvalds 已提交
3464 3465 3466 3467

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

T
Tejun Heo 已提交
3468
	ata_tf_init(dev, &tf);
3469 3470 3471 3472 3473
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3474

T
Tejun Heo 已提交
3475
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3476

3477 3478
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3479 3480
}

3481 3482 3483
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3484 3485
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3486 3487
 *
 *	LOCKING:
3488 3489 3490 3491
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3492
 */
T
Tejun Heo 已提交
3493 3494
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3495
{
3496
	struct ata_taskfile tf;
3497
	unsigned int err_mask;
3498 3499 3500

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3501
		return AC_ERR_INVALID;
3502 3503 3504 3505

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

T
Tejun Heo 已提交
3506
	ata_tf_init(dev, &tf);
3507 3508 3509 3510 3511
	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 */
3512

T
Tejun Heo 已提交
3513
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3514

3515 3516
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3517 3518
}

L
Linus Torvalds 已提交
3519
/**
J
Jeff Garzik 已提交
3520 3521 3522 3523
 *	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
3524 3525
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3526
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3527
 */
3528
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3529 3530
{
	struct ata_port *ap = qc->ap;
3531
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3532
	int dir = qc->dma_dir;
3533
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3534

3535 3536
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3537 3538

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3539
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3540

J
Jeff Garzik 已提交
3541
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3542

3543 3544 3545 3546 3547 3548 3549 3550
	/* 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) {
3551
		if (qc->n_elem)
3552
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
3553 3554 3555 3556 3557 3558
		/* 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);
3559
			kunmap_atomic(addr, KM_IRQ0);
3560 3561
		}
	} else {
3562
		if (qc->n_elem)
3563
			dma_unmap_single(ap->dev,
3564 3565
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
3566 3567 3568 3569 3570 3571
		/* 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
3572 3573

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
3574
	qc->__sg = NULL;
L
Linus Torvalds 已提交
3575 3576 3577 3578 3579 3580
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
3581 3582 3583
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
3584
 *	LOCKING:
J
Jeff Garzik 已提交
3585
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3586 3587 3588 3589 3590
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3591 3592
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
3593

3594
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
3595
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
3596 3597

	idx = 0;
3598
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631
		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
3632 3633 3634 3635
 *	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
3636
 *	LOCKING:
J
Jeff Garzik 已提交
3637
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3638
 *
L
Linus Torvalds 已提交
3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
int ata_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int rc = 0; /* Assume ATAPI DMA is OK by default */

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

	return rc;
}
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
3656 3657
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
3658
 *	LOCKING:
J
Jeff Garzik 已提交
3659
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3660 3661 3662 3663 3664 3665 3666 3667 3668
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

3669 3670
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
3671 3672 3673 3674 3675 3676 3677 3678 3679 3680
/**
 *	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
3681
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3682 3683
 */

L
Linus Torvalds 已提交
3684 3685 3686 3687
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

3688
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
3689
	qc->n_elem = 1;
3690
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
3691
	qc->buf_virt = buf;
3692
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
3693

3694
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
3695 3696
}

J
Jeff Garzik 已提交
3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707
/**
 *	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
3708
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
3709 3710
 */

L
Linus Torvalds 已提交
3711 3712 3713 3714
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
3715
	qc->__sg = sg;
L
Linus Torvalds 已提交
3716
	qc->n_elem = n_elem;
3717
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
3718 3719 3720
}

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

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
3737
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3738
	dma_addr_t dma_address;
3739
	int trim_sg = 0;
L
Linus Torvalds 已提交
3740

3741 3742 3743 3744 3745 3746
	/* 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;

3747
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758

		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;
3759 3760
		if (sg->length == 0)
			trim_sg = 1;
3761 3762 3763 3764 3765

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

3766 3767
	if (trim_sg) {
		qc->n_elem--;
3768 3769 3770
		goto skip_map;
	}

3771
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
3772
				     sg->length, dir);
3773 3774 3775
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
3776
		return -1;
3777
	}
L
Linus Torvalds 已提交
3778 3779

	sg_dma_address(sg) = dma_address;
3780
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
3781

3782
skip_map:
L
Linus Torvalds 已提交
3783 3784 3785 3786 3787 3788 3789
	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
3790 3791 3792 3793
 *	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
3794 3795
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3796
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3797 3798
 *
 *	RETURNS:
J
Jeff Garzik 已提交
3799
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
3800 3801 3802 3803 3804 3805
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
3806 3807
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
3808
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
3809 3810

	VPRINTK("ENTER, ata%u\n", ap->id);
3811
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
3812

3813 3814 3815 3816 3817 3818 3819
	/* 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;

3820
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834

		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);
3835
			kunmap_atomic(addr, KM_IRQ0);
3836 3837 3838 3839 3840 3841
		}

		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;
3842 3843
		if (lsg->length == 0)
			trim_sg = 1;
3844 3845 3846 3847 3848

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

3849 3850 3851 3852 3853 3854 3855 3856 3857
	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
3858
	dir = qc->dma_dir;
3859
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
3860 3861 3862
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
3863
		return -1;
3864
	}
L
Linus Torvalds 已提交
3865 3866 3867

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

3868
skip_map:
L
Linus Torvalds 已提交
3869 3870 3871 3872 3873
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
3874
/**
3875
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
3876 3877 3878 3879 3880 3881 3882 3883
 *	@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
3884
 *	Inherited from caller.
E
Edward Falk 已提交
3885
 */
L
Linus Torvalds 已提交
3886 3887 3888 3889 3890 3891 3892 3893 3894 3895
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
3896 3897
/**
 *	ata_mmio_data_xfer - Transfer data by MMIO
3898
 *	@adev: device for this I/O
A
Albert Lee 已提交
3899 3900
 *	@buf: data buffer
 *	@buflen: buffer length
3901
 *	@write_data: read/write
A
Albert Lee 已提交
3902 3903 3904 3905 3906 3907 3908
 *
 *	Transfer data from/to the device data register by MMIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

T
Tejun Heo 已提交
3909
void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
3910
			unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3911
{
3912
	struct ata_port *ap = adev->ap;
L
Linus Torvalds 已提交
3913 3914 3915 3916 3917
	unsigned int i;
	unsigned int words = buflen >> 1;
	u16 *buf16 = (u16 *) buf;
	void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;

A
Albert Lee 已提交
3918
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3919 3920 3921 3922 3923 3924 3925
	if (write_data) {
		for (i = 0; i < words; i++)
			writew(le16_to_cpu(buf16[i]), mmio);
	} else {
		for (i = 0; i < words; i++)
			buf16[i] = cpu_to_le16(readw(mmio));
	}
A
Albert Lee 已提交
3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939

	/* 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);
			writew(le16_to_cpu(align_buf[0]), mmio);
		} else {
			align_buf[0] = cpu_to_le16(readw(mmio));
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3940 3941
}

A
Albert Lee 已提交
3942 3943
/**
 *	ata_pio_data_xfer - Transfer data by PIO
3944
 *	@adev: device to target
A
Albert Lee 已提交
3945 3946
 *	@buf: data buffer
 *	@buflen: buffer length
3947
 *	@write_data: read/write
A
Albert Lee 已提交
3948 3949 3950 3951 3952 3953 3954
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

T
Tejun Heo 已提交
3955
void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
3956
		       unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
3957
{
3958
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
3959
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
3960

A
Albert Lee 已提交
3961
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
3962
	if (write_data)
A
Albert Lee 已提交
3963
		outsw(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
3964
	else
A
Albert Lee 已提交
3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979
		insw(ap->ioaddr.data_addr, buf, words);

	/* 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);
			outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
		} else {
			align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
3980 3981
}

3982 3983 3984 3985 3986 3987 3988
/**
 *	ata_pio_data_xfer_noirq - Transfer data by PIO
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
3989
 *	Transfer data from/to the device data register by PIO. Do the
3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
				    unsigned int buflen, int write_data)
{
	unsigned long flags;
	local_irq_save(flags);
	ata_pio_data_xfer(adev, buf, buflen, write_data);
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4006 4007 4008 4009 4010 4011 4012 4013 4014 4015
/**
 *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
 *	@qc: Command on going
 *
 *	Transfer ATA_SECT_SIZE of data from/to the ATA device.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4016 4017 4018
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4019
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4020 4021 4022 4023 4024 4025
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

	if (qc->cursect == (qc->nsect - 1))
A
Albert Lee 已提交
4026
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4027 4028 4029 4030 4031 4032 4033 4034 4035 4036

	page = sg[qc->cursg].page;
	offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;

	/* 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");

4037 4038 4039
	if (PageHighMem(page)) {
		unsigned long flags;

4040
		/* FIXME: use a bounce buffer */
4041 4042
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4043

4044
		/* do the actual data transfer */
4045
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
L
Linus Torvalds 已提交
4046

4047 4048 4049 4050
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4051
		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
4052
	}
L
Linus Torvalds 已提交
4053 4054 4055 4056

	qc->cursect++;
	qc->cursg_ofs++;

4057
	if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4058 4059 4060 4061 4062
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4063 4064 4065 4066
/**
 *	ata_pio_sectors - Transfer one or many 512-byte sectors.
 *	@qc: Command on going
 *
4067
 *	Transfer one or many ATA_SECT_SIZE of data from/to the
4068 4069 4070 4071 4072
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4073

4074 4075 4076 4077 4078 4079
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
4080
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4081

4082 4083 4084 4085 4086 4087 4088
		nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104
/**
 *	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");
4105
	WARN_ON(qc->dev->cdb_len < 12);
4106

4107
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122
	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
4123 4124
}

A
Albert Lee 已提交
4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136
/**
 *	__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
4137 4138 4139
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4140
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4141 4142 4143 4144 4145
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4146
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4147
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4148 4149

next_sg:
4150
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4151
		/*
4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162
		 * 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 */
4163 4164
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4165 4166

		for (i = 0; i < words; i++)
4167
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4168

A
Albert Lee 已提交
4169
		ap->hsm_task_state = HSM_ST_LAST;
4170 4171 4172
		return;
	}

4173
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4174 4175 4176 4177 4178 4179 4180 4181

	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;

4182
	/* don't overrun current sg */
4183
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4184 4185 4186 4187

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

4188 4189
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4190 4191 4192
	if (PageHighMem(page)) {
		unsigned long flags;

4193
		/* FIXME: use bounce buffer */
4194 4195
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4196

4197
		/* do the actual data transfer */
4198
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4199

4200 4201 4202 4203
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4204
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4205
	}
L
Linus Torvalds 已提交
4206 4207 4208 4209 4210

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

4211
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4212 4213 4214 4215
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4216
	if (bytes)
L
Linus Torvalds 已提交
4217 4218 4219
		goto next_sg;
}

A
Albert Lee 已提交
4220 4221 4222 4223 4224 4225 4226 4227 4228 4229
/**
 *	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
4230 4231 4232 4233 4234 4235 4236
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;

4237 4238 4239 4240 4241 4242 4243 4244 4245 4246
	/* 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
4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257
	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;

4258 4259
	VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);

L
Linus Torvalds 已提交
4260 4261 4262 4263 4264
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4265
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4266
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4267
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4268 4269 4270
}

/**
4271 4272 4273
 *	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
4274
 *
4275 4276
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4277
 */
4278 4279

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4280
{
4281 4282
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4283

4284 4285 4286 4287
	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
4288

4289 4290 4291
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4292 4293
	}

4294 4295
	return 0;
}
L
Linus Torvalds 已提交
4296

T
Tejun Heo 已提交
4297 4298 4299 4300 4301 4302 4303 4304
/**
 *	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
4305
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4306 4307 4308 4309 4310 4311 4312 4313 4314
 *	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) {
4315
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4316

J
Jeff Garzik 已提交
4317 4318
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4319 4320 4321 4322 4323 4324 4325 4326 4327 4328
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
					ata_irq_on(ap);
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4329
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4330 4331 4332 4333 4334 4335 4336 4337
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4338
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4339 4340
			ata_irq_on(ap);
			ata_qc_complete(qc);
4341
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4342 4343 4344
		} else
			ata_qc_complete(qc);
	}
L
Linus Torvalds 已提交
4345

4346
	ata_altstatus(ap); /* flush */
T
Tejun Heo 已提交
4347 4348
}

4349 4350 4351 4352 4353 4354 4355 4356 4357 4358
/**
 *	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.
 */
4359 4360
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4361
{
4362 4363 4364
	unsigned long flags = 0;
	int poll_next;

4365 4366
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4367 4368 4369 4370
	/* 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).
	 */
4371
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4372

4373
fsm_start:
4374 4375 4376
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state, status);

4377 4378
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4379 4380 4381 4382 4383 4384 4385 4386
		/* 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);

4387
		/* check device status */
4388 4389 4390 4391 4392 4393 4394 4395 4396
		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
4397
			ap->hsm_task_state = HSM_ST_ERR;
4398
			goto fsm_start;
L
Linus Torvalds 已提交
4399 4400
		}

4401 4402
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4403 4404 4405
		 * 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.
4406 4407 4408 4409
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
			       ap->id, status);
4410
			qc->err_mask |= AC_ERR_HSM;
4411 4412
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4413
		}
L
Linus Torvalds 已提交
4414

4415 4416 4417 4418 4419 4420
		/* 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)
4421
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4422

4423 4424 4425 4426
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4427

4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439
			/* 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)
4440
			spin_unlock_irqrestore(ap->lock, flags);
4441 4442 4443 4444

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4445
		break;
4446

4447 4448 4449 4450 4451
	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) {
4452 4453 4454
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4455 4456 4457
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4458

4459 4460
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4461 4462 4463
			 * 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.
4464 4465 4466 4467
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
				       ap->id, status);
4468
				qc->err_mask |= AC_ERR_HSM;
4469 4470
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4471
			}
L
Linus Torvalds 已提交
4472

4473
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4474

4475 4476 4477
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4478

4479 4480 4481 4482
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4483 4484 4485 4486
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4487 4488 4489 4490 4491 4492
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4493

4494 4495 4496
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4497

4498 4499 4500 4501 4502 4503 4504 4505 4506
			/* 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.
4507 4508 4509 4510
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4511 4512 4513 4514 4515 4516 4517

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

4518 4519 4520
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

4521 4522 4523 4524 4525 4526
				/* 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;
4527 4528
			}

4529 4530 4531 4532 4533 4534
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
4535
				status = ata_wait_idle(ap);
4536 4537 4538 4539 4540
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
4541
		poll_next = 1;
L
Linus Torvalds 已提交
4542 4543
		break;

A
Albert Lee 已提交
4544
	case HSM_ST_LAST:
4545 4546
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
4547 4548 4549 4550 4551
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
4552 4553
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
			ap->id, qc->dev->devno, status);
4554

4555 4556
		WARN_ON(qc->err_mask);

4557
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
4558

4559
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4560
		ata_hsm_qc_complete(qc, in_wq);
4561 4562

		poll_next = 0;
L
Linus Torvalds 已提交
4563 4564
		break;

A
Albert Lee 已提交
4565
	case HSM_ST_ERR:
4566 4567 4568 4569 4570 4571
		/* 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;
4572

4573
		/* complete taskfile transaction */
T
Tejun Heo 已提交
4574
		ata_hsm_qc_complete(qc, in_wq);
4575 4576

		poll_next = 0;
4577 4578
		break;
	default:
4579
		poll_next = 0;
4580
		BUG();
L
Linus Torvalds 已提交
4581 4582
	}

4583
	return poll_next;
L
Linus Torvalds 已提交
4584 4585
}

4586
static void ata_pio_task(struct work_struct *work)
4587
{
4588 4589 4590
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
4591
	u8 status;
4592
	int poll_next;
4593

J
Jeff Garzik 已提交
4594
fsm_start:
4595
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
4596

4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608
	/*
	 * 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) {
4609
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
4610 4611
			return;
		}
4612 4613
	}

4614 4615
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
4616

4617 4618 4619 4620
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
4621
		goto fsm_start;
4622 4623
}

L
Linus Torvalds 已提交
4624 4625 4626 4627 4628 4629
/**
 *	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
4630
 *	None.
L
Linus Torvalds 已提交
4631 4632 4633 4634 4635 4636 4637
 */

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

4638
	/* no command while frozen */
4639
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
4640 4641
		return NULL;

4642 4643
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
4644
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
4645
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659
			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
4660
 *	None.
L
Linus Torvalds 已提交
4661 4662
 */

T
Tejun Heo 已提交
4663
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4664
{
T
Tejun Heo 已提交
4665
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
4666 4667 4668 4669 4670 4671 4672 4673
	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
4674
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687
	}

	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
4688
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4689 4690 4691
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4692 4693 4694
	struct ata_port *ap = qc->ap;
	unsigned int tag;

4695
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
4696

4697 4698 4699 4700
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4701
		clear_bit(tag, &ap->qc_allocated);
4702
	}
L
Linus Torvalds 已提交
4703 4704
}

4705
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4706
{
4707 4708
	struct ata_port *ap = qc->ap;

4709 4710
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
4711 4712 4713 4714

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

4715
	/* command should be marked inactive atomically with qc completion */
4716 4717 4718 4719
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
4720

4721 4722 4723 4724 4725
	/* 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;
4726
	ap->qc_active &= ~(1 << qc->tag);
4727

L
Linus Torvalds 已提交
4728
	/* call completion callback */
4729
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4730 4731
}

4732 4733 4734 4735 4736 4737 4738 4739
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

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

4740 4741 4742 4743 4744 4745 4746 4747 4748
/**
 *	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
4749
 *	spin_lock_irqsave(host lock)
4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768
 */
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) {
4769
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
4770 4771 4772 4773 4774 4775 4776

		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 */
4777
				fill_result_tf(qc);
4778 4779 4780 4781 4782 4783 4784
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4785
			fill_result_tf(qc);
4786 4787 4788 4789 4790 4791 4792 4793

		__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)
4794
			fill_result_tf(qc);
4795 4796 4797 4798 4799

		__ata_qc_complete(qc);
	}
}

4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811
/**
 *	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
4812
 *	spin_lock_irqsave(host lock)
4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848
 *
 *	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
4849 4850 4851 4852 4853
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
4854
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882
	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
4883
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4884
 */
4885
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4886 4887 4888
{
	struct ata_port *ap = qc->ap;

4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902
	/* 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;
	}

4903
	qc->flags |= ATA_QCFLAG_ACTIVE;
4904
	ap->qc_active |= 1 << qc->tag;
4905

L
Linus Torvalds 已提交
4906 4907 4908
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
4909
				goto sg_err;
L
Linus Torvalds 已提交
4910 4911
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
4912
				goto sg_err;
L
Linus Torvalds 已提交
4913 4914 4915 4916 4917 4918 4919
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

4920 4921 4922 4923
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
4924

4925 4926
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4927 4928 4929
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940
}

/**
 *	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
4941 4942
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
4943
 *	LOCKING:
J
Jeff Garzik 已提交
4944
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4945 4946
 *
 *	RETURNS:
4947
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
4948 4949
 */

4950
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4951 4952 4953
{
	struct ata_port *ap = qc->ap;

4954 4955 4956 4957 4958 4959
	/* 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:
4960
		case ATA_PROT_NODATA:
4961 4962 4963 4964 4965 4966
		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)
4967
				/* see ata_dma_blacklisted() */
4968 4969 4970 4971 4972 4973 4974
				BUG();
			break;
		default:
			break;
		}
	}

4975 4976 4977 4978 4979 4980 4981 4982
	/* Some controllers show flaky interrupt behavior after
	 * setting xfer mode.  Use polling instead.
	 */
	if (unlikely(qc->tf.command == ATA_CMD_SET_FEATURES &&
		     qc->tf.feature == SETFEATURES_XFER) &&
	    (ap->flags & ATA_FLAG_SETXFER_POLLING))
		qc->tf.flags |= ATA_TFLAG_POLLING;

4983
	/* select the device */
L
Linus Torvalds 已提交
4984 4985
	ata_dev_select(ap, qc->dev->devno, 1, 0);

4986
	/* start the command */
L
Linus Torvalds 已提交
4987 4988
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
4989 4990 4991
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
4992
		ata_tf_to_host(ap, &qc->tf);
4993 4994 4995
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
4996
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
4997

L
Linus Torvalds 已提交
4998 4999 5000
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5001
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5002

L
Linus Torvalds 已提交
5003 5004 5005
		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 */
5006
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5007 5008
		break;

5009 5010 5011
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5012

J
Jeff Garzik 已提交
5013
		ata_tf_to_host(ap, &qc->tf);
5014

5015 5016 5017
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5018
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5019 5020

			/* always send first data block using
5021
			 * the ata_pio_task() codepath.
5022
			 */
5023
		} else {
5024 5025 5026 5027
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5028
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5029 5030 5031 5032

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5033 5034
		}

L
Linus Torvalds 已提交
5035 5036 5037 5038
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5039 5040 5041
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5042
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5043

5044 5045 5046 5047 5048
		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))
5049
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5050 5051 5052
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5053
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5054

L
Linus Torvalds 已提交
5055 5056
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5057 5058 5059 5060
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5061
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5062 5063 5064 5065
		break;

	default:
		WARN_ON(1);
5066
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081
	}

	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
5082
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5083 5084 5085 5086 5087 5088 5089 5090
 *
 *	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)
{
5091
	struct ata_eh_info *ehi = &ap->eh_info;
5092
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5093

5094 5095
	VPRINTK("ata%u: protocol %d task_state %d\n",
		ap->id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5096

5097 5098 5099
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5100 5101 5102
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5103

5104 5105 5106 5107 5108
		/* 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
5109 5110
			goto idle_irq;
		break;
5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
			VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);

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

			/* before we do anything else, clear DMA-Start bit */
			ap->ops->bmdma_stop(qc);
5124 5125 5126 5127 5128 5129

			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;
			}
5130 5131 5132 5133
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5134 5135 5136 5137
	default:
		goto idle_irq;
	}

5138 5139 5140 5141
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5142

5143 5144 5145 5146
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5147

5148 5149
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5150

5151
	ata_hsm_move(ap, qc, status, 0);
5152 5153 5154 5155 5156

	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
5157 5158 5159 5160 5161 5162 5163 5164
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
		ata_irq_ack(ap, 0); /* debug trap */
5165
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5166
		return 1;
L
Linus Torvalds 已提交
5167 5168 5169 5170 5171 5172 5173
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5174
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5175
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5176
 *
J
Jeff Garzik 已提交
5177 5178 5179
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5180
 *	LOCKING:
J
Jeff Garzik 已提交
5181
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5182 5183
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5184
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5185 5186
 */

5187
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5188
{
J
Jeff Garzik 已提交
5189
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5190 5191 5192 5193 5194
	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
5195
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5196

J
Jeff Garzik 已提交
5197
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5198 5199
		struct ata_port *ap;

J
Jeff Garzik 已提交
5200
		ap = host->ports[i];
5201
		if (ap &&
J
Jeff Garzik 已提交
5202
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5203 5204 5205
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5206
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5207
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5208 5209 5210 5211
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5212
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5213 5214 5215 5216

	return IRQ_RETVAL(handled);
}

5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353
/**
 *	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
5354

5355
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5356
{
5357
	unsigned int err_mask;
J
Jens Axboe 已提交
5358 5359 5360 5361 5362
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5363
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5364 5365 5366 5367
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5368 5369 5370 5371 5372 5373 5374
	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
5375 5376
}

J
Jeff Garzik 已提交
5377 5378 5379
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5380 5381 5382 5383
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5384 5385
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424

		/* 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
5425 5426
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5427 5428
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5429
 *	Suspend @host.  Actual operation is performed by EH.  This
5430 5431 5432 5433 5434 5435 5436 5437 5438
 *	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
5439
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5440 5441 5442
{
	int i, j, rc;

J
Jeff Garzik 已提交
5443
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5444 5445 5446 5447 5448 5449 5450
	if (rc)
		goto fail;

	/* EH is quiescent now.  Fail if we have any ready device.
	 * This happens if hotplug occurs between completion of device
	 * suspension and here.
	 */
J
Jeff Garzik 已提交
5451 5452
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466

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

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

J
Jeff Garzik 已提交
5467
	host->dev->power.power_state = mesg;
5468 5469 5470
	return 0;

 fail:
J
Jeff Garzik 已提交
5471
	ata_host_resume(host);
5472 5473 5474 5475
	return rc;
}

/**
J
Jeff Garzik 已提交
5476 5477
 *	ata_host_resume - resume host
 *	@host: host to resume
5478
 *
J
Jeff Garzik 已提交
5479
 *	Resume @host.  Actual operation is performed by EH.  This
5480 5481 5482 5483 5484 5485
 *	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
5486
void ata_host_resume(struct ata_host *host)
5487
{
J
Jeff Garzik 已提交
5488 5489 5490
	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;
5491 5492
}

5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505
/**
 *	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.
 */

L
Linus Torvalds 已提交
5506 5507
int ata_port_start (struct ata_port *ap)
{
5508
	struct device *dev = ap->dev;
5509
	int rc;
L
Linus Torvalds 已提交
5510 5511 5512 5513 5514

	ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
	if (!ap->prd)
		return -ENOMEM;

5515 5516
	rc = ata_pad_alloc(ap, dev);
	if (rc) {
5517
		dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
5518
		return rc;
5519 5520
	}

L
Linus Torvalds 已提交
5521 5522 5523 5524 5525
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);

	return 0;
}

E
Edward Falk 已提交
5526 5527 5528 5529 5530 5531 5532 5533 5534 5535

/**
 *	ata_port_stop - Undo ata_port_start()
 *	@ap: Port to shut down
 *
 *	Frees the PRD table.
 *
 *	May be used as the port_stop() entry in ata_port_operations.
 *
 *	LOCKING:
R
Randy Dunlap 已提交
5536
 *	Inherited from caller.
E
Edward Falk 已提交
5537 5538
 */

L
Linus Torvalds 已提交
5539 5540
void ata_port_stop (struct ata_port *ap)
{
5541
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
5542 5543

	dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
5544
	ata_pad_free(ap, dev);
L
Linus Torvalds 已提交
5545 5546
}

J
Jeff Garzik 已提交
5547
void ata_host_stop (struct ata_host *host)
J
Jeff Garzik 已提交
5548
{
J
Jeff Garzik 已提交
5549 5550
	if (host->mmio_base)
		iounmap(host->mmio_base);
J
Jeff Garzik 已提交
5551 5552
}

5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564
/**
 *	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;
5565 5566
	unsigned long flags;

5567 5568 5569
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5570 5571
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5572
	 * host lock.
5573
	 */
5574
	spin_lock_irqsave(ap->lock, flags);
5575
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5576
	spin_unlock_irqrestore(ap->lock, flags);
5577

5578 5579
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
5580 5581 5582 5583 5584
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
5585
/**
B
Brian King 已提交
5586
 *	ata_port_init - Initialize an ata_port structure
L
Linus Torvalds 已提交
5587
 *	@ap: Structure to initialize
J
Jeff Garzik 已提交
5588
 *	@host: Collection of hosts to which @ap belongs
L
Linus Torvalds 已提交
5589 5590 5591
 *	@ent: Probe information provided by low-level driver
 *	@port_no: Port number associated with this ata_port
 *
B
Brian King 已提交
5592
 *	Initialize a new ata_port structure.
J
Jeff Garzik 已提交
5593
 *
L
Linus Torvalds 已提交
5594
 *	LOCKING:
J
Jeff Garzik 已提交
5595
 *	Inherited from caller.
L
Linus Torvalds 已提交
5596
 */
J
Jeff Garzik 已提交
5597
void ata_port_init(struct ata_port *ap, struct ata_host *host,
B
Brian King 已提交
5598
		   const struct ata_probe_ent *ent, unsigned int port_no)
L
Linus Torvalds 已提交
5599 5600 5601
{
	unsigned int i;

J
Jeff Garzik 已提交
5602
	ap->lock = &host->lock;
5603
	ap->flags = ATA_FLAG_DISABLED;
B
Brian King 已提交
5604
	ap->id = ata_unique_id++;
L
Linus Torvalds 已提交
5605
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
5606
	ap->host = host;
5607
	ap->dev = ent->dev;
L
Linus Torvalds 已提交
5608
	ap->port_no = port_no;
5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621
	if (port_no == 1 && ent->pinfo2) {
		ap->pio_mask = ent->pinfo2->pio_mask;
		ap->mwdma_mask = ent->pinfo2->mwdma_mask;
		ap->udma_mask = ent->pinfo2->udma_mask;
		ap->flags |= ent->pinfo2->flags;
		ap->ops = ent->pinfo2->port_ops;
	} else {
		ap->pio_mask = ent->pio_mask;
		ap->mwdma_mask = ent->mwdma_mask;
		ap->udma_mask = ent->udma_mask;
		ap->flags |= ent->port_flags;
		ap->ops = ent->port_ops;
	}
5622
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
5623 5624
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
5625 5626 5627 5628 5629 5630

#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
5631
#else
5632
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5633
#endif
L
Linus Torvalds 已提交
5634

5635 5636 5637
	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);
5638
	INIT_LIST_HEAD(&ap->eh_done_q);
5639
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
5640

5641 5642 5643 5644 5645
	/* set cable type */
	ap->cbl = ATA_CBL_NONE;
	if (ap->flags & ATA_FLAG_SATA)
		ap->cbl = ATA_CBL_SATA;

5646 5647
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
5648
		dev->ap = ap;
5649
		dev->devno = i;
5650
		ata_dev_init(dev);
5651
	}
L
Linus Torvalds 已提交
5652 5653 5654 5655 5656 5657 5658 5659 5660

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

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

B
Brian King 已提交
5661
/**
5662 5663 5664
 *	ata_port_init_shost - Initialize SCSI host associated with ATA port
 *	@ap: ATA port to initialize SCSI host for
 *	@shost: SCSI host associated with @ap
B
Brian King 已提交
5665
 *
5666
 *	Initialize SCSI host @shost associated with ATA port @ap.
B
Brian King 已提交
5667 5668 5669 5670
 *
 *	LOCKING:
 *	Inherited from caller.
 */
5671
static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
B
Brian King 已提交
5672
{
J
Jeff Garzik 已提交
5673
	ap->scsi_host = shost;
B
Brian King 已提交
5674

5675 5676 5677 5678 5679
	shost->unique_id = ap->id;
	shost->max_id = 16;
	shost->max_lun = 1;
	shost->max_channel = 1;
	shost->max_cmd_len = 12;
B
Brian King 已提交
5680 5681
}

L
Linus Torvalds 已提交
5682
/**
5683
 *	ata_port_add - Attach low-level ATA driver to system
L
Linus Torvalds 已提交
5684
 *	@ent: Information provided by low-level driver
J
Jeff Garzik 已提交
5685
 *	@host: Collections of ports to which we add
L
Linus Torvalds 已提交
5686 5687
 *	@port_no: Port number associated with this host
 *
J
Jeff Garzik 已提交
5688 5689
 *	Attach low-level ATA driver to system.
 *
L
Linus Torvalds 已提交
5690
 *	LOCKING:
J
Jeff Garzik 已提交
5691
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5692 5693
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5694
 *	New ata_port on success, for NULL on error.
L
Linus Torvalds 已提交
5695
 */
5696
static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
J
Jeff Garzik 已提交
5697
				      struct ata_host *host,
L
Linus Torvalds 已提交
5698 5699
				      unsigned int port_no)
{
5700
	struct Scsi_Host *shost;
L
Linus Torvalds 已提交
5701 5702 5703
	struct ata_port *ap;

	DPRINTK("ENTER\n");
T
Tejun Heo 已提交
5704

5705
	if (!ent->port_ops->error_handler &&
J
Jeff Garzik 已提交
5706
	    !(ent->port_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
T
Tejun Heo 已提交
5707 5708 5709 5710 5711
		printk(KERN_ERR "ata%u: no reset mechanism available\n",
		       port_no);
		return NULL;
	}

5712 5713
	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
	if (!shost)
L
Linus Torvalds 已提交
5714 5715
		return NULL;

5716
	shost->transportt = &ata_scsi_transport_template;
5717

5718
	ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
5719

J
Jeff Garzik 已提交
5720
	ata_port_init(ap, host, ent, port_no);
5721
	ata_port_init_shost(ap, shost);
L
Linus Torvalds 已提交
5722 5723 5724 5725

	return ap;
}

5726
/**
J
Jeff Garzik 已提交
5727 5728 5729 5730 5731
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
5732 5733 5734 5735 5736 5737
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */

J
Jeff Garzik 已提交
5738 5739
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
5740
{
J
Jeff Garzik 已提交
5741 5742 5743 5744
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
5745 5746
}

L
Linus Torvalds 已提交
5747
/**
J
Jeff Garzik 已提交
5748 5749 5750 5751 5752 5753 5754 5755 5756 5757
 *	ata_device_add - Register hardware device with ATA and SCSI layers
 *	@ent: Probe information describing hardware device to be registered
 *
 *	This function processes the information provided in the probe
 *	information struct @ent, allocates the necessary ATA and SCSI
 *	host information structures, initializes them, and registers
 *	everything with requisite kernel subsystems.
 *
 *	This function requests irqs, probes the ATA bus, and probes
 *	the SCSI bus.
L
Linus Torvalds 已提交
5758 5759
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5760
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
5761 5762
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5763
 *	Number of ports registered.  Zero on error (no ports registered).
L
Linus Torvalds 已提交
5764
 */
J
Jeff Garzik 已提交
5765
int ata_device_add(const struct ata_probe_ent *ent)
L
Linus Torvalds 已提交
5766
{
5767
	unsigned int i;
L
Linus Torvalds 已提交
5768
	struct device *dev = ent->dev;
J
Jeff Garzik 已提交
5769
	struct ata_host *host;
5770
	int rc;
L
Linus Torvalds 已提交
5771 5772

	DPRINTK("ENTER\n");
5773 5774 5775 5776 5777
	
	if (ent->irq == 0) {
		dev_printk(KERN_ERR, dev, "is not available: No interrupt assigned.\n");
		return 0;
	}
L
Linus Torvalds 已提交
5778
	/* alloc a container for our list of ATA ports (buses) */
J
Jeff Garzik 已提交
5779 5780 5781
	host = kzalloc(sizeof(struct ata_host) +
		       (ent->n_ports * sizeof(void *)), GFP_KERNEL);
	if (!host)
L
Linus Torvalds 已提交
5782 5783
		return 0;

J
Jeff Garzik 已提交
5784 5785 5786 5787 5788 5789
	ata_host_init(host, dev, ent->_host_flags, ent->port_ops);
	host->n_ports = ent->n_ports;
	host->irq = ent->irq;
	host->irq2 = ent->irq2;
	host->mmio_base = ent->mmio_base;
	host->private_data = ent->private_data;
L
Linus Torvalds 已提交
5790 5791

	/* register each port bound to this device */
J
Jeff Garzik 已提交
5792
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5793 5794
		struct ata_port *ap;
		unsigned long xfer_mode_mask;
5795
		int irq_line = ent->irq;
L
Linus Torvalds 已提交
5796

J
Jeff Garzik 已提交
5797
		ap = ata_port_add(ent, host, i);
5798
		host->ports[i] = ap;
L
Linus Torvalds 已提交
5799 5800 5801
		if (!ap)
			goto err_out;

T
Tejun Heo 已提交
5802 5803 5804 5805 5806 5807 5808 5809 5810 5811
		/* dummy? */
		if (ent->dummy_port_mask & (1 << i)) {
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
			ap->ops = &ata_dummy_port_ops;
			continue;
		}

		/* start port */
		rc = ap->ops->port_start(ap);
		if (rc) {
J
Jeff Garzik 已提交
5812 5813
			host->ports[i] = NULL;
			scsi_host_put(ap->scsi_host);
T
Tejun Heo 已提交
5814 5815 5816
			goto err_out;
		}

5817 5818 5819 5820
		/* Report the secondary IRQ for second channel legacy */
		if (i == 1 && ent->irq2)
			irq_line = ent->irq2;

L
Linus Torvalds 已提交
5821 5822 5823 5824 5825
		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
				(ap->pio_mask << ATA_SHIFT_PIO);

		/* print per-port info to dmesg */
5826
		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
5827
				"ctl 0x%lX bmdma 0x%lX irq %d\n",
5828 5829 5830 5831 5832
				ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
				ata_mode_string(xfer_mode_mask),
				ap->ioaddr.cmd_addr,
				ap->ioaddr.ctl_addr,
				ap->ioaddr.bmdma_addr,
5833
				irq_line);
L
Linus Torvalds 已提交
5834

5835 5836
		/* freeze port before requesting IRQ */
		ata_eh_freeze_port(ap);
L
Linus Torvalds 已提交
5837 5838
	}

5839
	/* obtain irq, that may be shared between channels */
5840
	rc = request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
J
Jeff Garzik 已提交
5841
			 DRV_NAME, host);
5842 5843 5844
	if (rc) {
		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
			   ent->irq, rc);
L
Linus Torvalds 已提交
5845
		goto err_out;
5846
	}
L
Linus Torvalds 已提交
5847

5848 5849 5850 5851 5852 5853 5854
	/* do we have a second IRQ for the other channel, eg legacy mode */
	if (ent->irq2) {
		/* We will get weird core code crashes later if this is true
		   so trap it now */
		BUG_ON(ent->irq == ent->irq2);

		rc = request_irq(ent->irq2, ent->port_ops->irq_handler, ent->irq_flags,
J
Jeff Garzik 已提交
5855
			 DRV_NAME, host);
5856 5857 5858 5859 5860 5861 5862
		if (rc) {
			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
				   ent->irq2, rc);
			goto err_out_free_irq;
		}
	}

L
Linus Torvalds 已提交
5863 5864
	/* perform each probe synchronously */
	DPRINTK("probe begin\n");
J
Jeff Garzik 已提交
5865 5866
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5867
		u32 scontrol;
L
Linus Torvalds 已提交
5868 5869
		int rc;

5870 5871 5872 5873 5874 5875 5876
		/* init sata_spd_limit to the current value */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
			ap->hw_sata_spd_limit &= (1 << spd) - 1;
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

J
Jeff Garzik 已提交
5877
		rc = scsi_add_host(ap->scsi_host, dev);
L
Linus Torvalds 已提交
5878
		if (rc) {
5879
			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
L
Linus Torvalds 已提交
5880 5881 5882 5883 5884 5885
			/* FIXME: do something useful here */
			/* FIXME: handle unconditional calls to
			 * scsi_scan_host and ata_host_remove, below,
			 * at the very least
			 */
		}
5886

5887
		if (ap->ops->error_handler) {
5888
			struct ata_eh_info *ehi = &ap->eh_info;
5889 5890 5891 5892 5893
			unsigned long flags;

			ata_port_probe(ap);

			/* kick EH for boot probing */
5894
			spin_lock_irqsave(ap->lock, flags);
5895

5896 5897 5898
			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5899

5900
			ap->pflags |= ATA_PFLAG_LOADING;
5901 5902
			ata_port_schedule_eh(ap);

5903
			spin_unlock_irqrestore(ap->lock, flags);
5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920

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

			if (rc) {
				/* FIXME: do something useful here?
				 * Current libata behavior will
				 * tear down everything when
				 * the module is removed
				 * or the h/w is unplugged.
				 */
			}
		}
L
Linus Torvalds 已提交
5921 5922 5923
	}

	/* probes are done, now scan each port's disk(s) */
5924
	DPRINTK("host probe begin\n");
J
Jeff Garzik 已提交
5925 5926
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
L
Linus Torvalds 已提交
5927

J
Jeff Garzik 已提交
5928
		ata_scsi_scan_host(ap);
L
Linus Torvalds 已提交
5929 5930
	}

J
Jeff Garzik 已提交
5931
	dev_set_drvdata(dev, host);
L
Linus Torvalds 已提交
5932 5933 5934 5935

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

5936
err_out_free_irq:
J
Jeff Garzik 已提交
5937
	free_irq(ent->irq, host);
L
Linus Torvalds 已提交
5938
err_out:
J
Jeff Garzik 已提交
5939 5940
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5941 5942
		if (ap) {
			ap->ops->port_stop(ap);
J
Jeff Garzik 已提交
5943
			scsi_host_put(ap->scsi_host);
5944
		}
L
Linus Torvalds 已提交
5945
	}
5946

J
Jeff Garzik 已提交
5947
	kfree(host);
L
Linus Torvalds 已提交
5948 5949 5950 5951
	VPRINTK("EXIT, returning 0\n");
	return 0;
}

5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968
/**
 *	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)
5969
		goto skip_eh;
5970 5971

	/* tell EH we're leaving & flush EH */
5972
	spin_lock_irqsave(ap->lock, flags);
5973
	ap->pflags |= ATA_PFLAG_UNLOADING;
5974
	spin_unlock_irqrestore(ap->lock, flags);
5975 5976 5977 5978 5979 5980

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
5981
	spin_lock_irqsave(ap->lock, flags);
5982 5983 5984 5985

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

5986
	spin_unlock_irqrestore(ap->lock, flags);
5987 5988 5989 5990 5991

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
5992
	spin_lock_irqsave(ap->lock, flags);
5993
	ata_port_freeze(ap);	/* won't be thawed */
5994
	spin_unlock_irqrestore(ap->lock, flags);
5995 5996 5997 5998 5999 6000 6001 6002 6003 6004

	ata_port_wait_eh(ap);

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

6005
 skip_eh:
6006
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6007
	scsi_remove_host(ap->scsi_host);
6008 6009
}

6010
/**
J
Jeff Garzik 已提交
6011 6012
 *	ata_host_remove - PCI layer callback for device removal
 *	@host: ATA host set that was removed
6013
 *
6014
 *	Unregister all objects associated with this host set. Free those
6015 6016 6017 6018 6019 6020
 *	objects.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */

J
Jeff Garzik 已提交
6021
void ata_host_remove(struct ata_host *host)
6022 6023 6024
{
	unsigned int i;

J
Jeff Garzik 已提交
6025 6026
	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
6027

J
Jeff Garzik 已提交
6028 6029 6030
	free_irq(host->irq, host);
	if (host->irq2)
		free_irq(host->irq2, host);
6031

J
Jeff Garzik 已提交
6032 6033
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6034

J
Jeff Garzik 已提交
6035
		ata_scsi_release(ap->scsi_host);
6036 6037 6038 6039

		if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
			struct ata_ioports *ioaddr = &ap->ioaddr;

6040 6041 6042 6043 6044
			/* FIXME: Add -ac IDE pci mods to remove these special cases */
			if (ioaddr->cmd_addr == ATA_PRIMARY_CMD)
				release_region(ATA_PRIMARY_CMD, 8);
			else if (ioaddr->cmd_addr == ATA_SECONDARY_CMD)
				release_region(ATA_SECONDARY_CMD, 8);
6045 6046
		}

J
Jeff Garzik 已提交
6047
		scsi_host_put(ap->scsi_host);
6048 6049
	}

J
Jeff Garzik 已提交
6050 6051
	if (host->ops->host_stop)
		host->ops->host_stop(host);
6052

J
Jeff Garzik 已提交
6053
	kfree(host);
6054 6055
}

L
Linus Torvalds 已提交
6056 6057
/**
 *	ata_scsi_release - SCSI layer callback hook for host unload
6058
 *	@shost: libata host to be unloaded
L
Linus Torvalds 已提交
6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069
 *
 *	Performs all duties necessary to shut down a libata port...
 *	Kill port kthread, disable port, and release resources.
 *
 *	LOCKING:
 *	Inherited from SCSI layer.
 *
 *	RETURNS:
 *	One.
 */

J
Jeff Garzik 已提交
6070
int ata_scsi_release(struct Scsi_Host *shost)
L
Linus Torvalds 已提交
6071
{
J
Jeff Garzik 已提交
6072
	struct ata_port *ap = ata_shost_to_port(shost);
L
Linus Torvalds 已提交
6073 6074 6075 6076

	DPRINTK("ENTER\n");

	ap->ops->port_disable(ap);
6077
	ap->ops->port_stop(ap);
L
Linus Torvalds 已提交
6078 6079 6080 6081 6082

	DPRINTK("EXIT\n");
	return 1;
}

6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098
struct ata_probe_ent *
ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
{
	struct ata_probe_ent *probe_ent;

	probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
	if (!probe_ent) {
		printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
		       kobject_name(&(dev->kobj)));
		return NULL;
	}

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

	probe_ent->sht = port->sht;
J
Jeff Garzik 已提交
6099
	probe_ent->port_flags = port->flags;
6100 6101 6102 6103
	probe_ent->pio_mask = port->pio_mask;
	probe_ent->mwdma_mask = port->mwdma_mask;
	probe_ent->udma_mask = port->udma_mask;
	probe_ent->port_ops = port->port_ops;
6104
	probe_ent->private_data = port->private_data;
6105 6106 6107 6108

	return probe_ent;
}

L
Linus Torvalds 已提交
6109 6110 6111
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6112 6113 6114 6115 6116 6117 6118
 *
 *	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
6119
 */
E
Edward Falk 已提交
6120

L
Linus Torvalds 已提交
6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134
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
6135

6136 6137
#ifdef CONFIG_PCI

J
Jeff Garzik 已提交
6138
void ata_pci_host_stop (struct ata_host *host)
6139
{
J
Jeff Garzik 已提交
6140
	struct pci_dev *pdev = to_pci_dev(host->dev);
6141

J
Jeff Garzik 已提交
6142
	pci_iounmap(pdev, host->mmio_base);
6143 6144
}

L
Linus Torvalds 已提交
6145 6146 6147 6148 6149
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
 *	PCI layer indicates to libata via this hook that
R
Randy Dunlap 已提交
6150
 *	hot-unplug or module unload event has occurred.
L
Linus Torvalds 已提交
6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161
 *	Handle this by unregistering all objects associated
 *	with this PCI device.  Free those objects.  Then finally
 *	release PCI resources and disable device.
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */

void ata_pci_remove_one (struct pci_dev *pdev)
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6162
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6163

J
Jeff Garzik 已提交
6164
	ata_host_remove(host);
6165

L
Linus Torvalds 已提交
6166 6167 6168 6169 6170 6171
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	dev_set_drvdata(dev, NULL);
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6172
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203
{
	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
6204

6205
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6206 6207
{
	pci_save_state(pdev);
6208

6209
	if (mesg.event == PM_EVENT_SUSPEND) {
6210 6211 6212
		pci_disable_device(pdev);
		pci_set_power_state(pdev, PCI_D3hot);
	}
J
Jens Axboe 已提交
6213 6214
}

6215
void ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6216 6217 6218 6219 6220
{
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
	pci_enable_device(pdev);
	pci_set_master(pdev);
6221 6222
}

6223
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6224
{
J
Jeff Garzik 已提交
6225
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6226 6227
	int rc = 0;

J
Jeff Garzik 已提交
6228
	rc = ata_host_suspend(host, mesg);
6229 6230 6231
	if (rc)
		return rc;

6232
	ata_pci_device_do_suspend(pdev, mesg);
6233 6234 6235 6236 6237 6238

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6239
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6240 6241

	ata_pci_device_do_resume(pdev);
J
Jeff Garzik 已提交
6242
	ata_host_resume(host);
J
Jens Axboe 已提交
6243 6244
	return 0;
}
L
Linus Torvalds 已提交
6245 6246 6247 6248 6249
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6250
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6251 6252 6253 6254
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6255 6256 6257 6258 6259 6260
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6261 6262 6263 6264 6265 6266 6267
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6268
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6269 6270
}

6271
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6272 6273
module_exit(ata_exit);

6274
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6275
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294

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;
}

6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340
/**
 *	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
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
/*
 * Dummy port_ops
 */
static void ata_dummy_noret(struct ata_port *ap)	{ }
static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }

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

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

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

L
Linus Torvalds 已提交
6374 6375 6376 6377 6378 6379 6380
/*
 * 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.
 */

6381 6382 6383
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
6384
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
L
Linus Torvalds 已提交
6385 6386
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6387
EXPORT_SYMBOL_GPL(ata_host_init);
L
Linus Torvalds 已提交
6388
EXPORT_SYMBOL_GPL(ata_device_add);
6389
EXPORT_SYMBOL_GPL(ata_port_detach);
J
Jeff Garzik 已提交
6390
EXPORT_SYMBOL_GPL(ata_host_remove);
L
Linus Torvalds 已提交
6391 6392
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6393
EXPORT_SYMBOL_GPL(ata_hsm_move);
6394
EXPORT_SYMBOL_GPL(ata_qc_complete);
6395
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407
EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
EXPORT_SYMBOL_GPL(ata_tf_load);
EXPORT_SYMBOL_GPL(ata_tf_read);
EXPORT_SYMBOL_GPL(ata_noop_dev_select);
EXPORT_SYMBOL_GPL(ata_std_dev_select);
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
EXPORT_SYMBOL_GPL(ata_port_stop);
J
Jeff Garzik 已提交
6408
EXPORT_SYMBOL_GPL(ata_host_stop);
L
Linus Torvalds 已提交
6409
EXPORT_SYMBOL_GPL(ata_interrupt);
6410 6411
EXPORT_SYMBOL_GPL(ata_mmio_data_xfer);
EXPORT_SYMBOL_GPL(ata_pio_data_xfer);
6412
EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq);
L
Linus Torvalds 已提交
6413
EXPORT_SYMBOL_GPL(ata_qc_prep);
6414
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6415 6416 6417 6418 6419
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);
6420 6421 6422 6423 6424
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
6425
EXPORT_SYMBOL_GPL(ata_port_probe);
6426
EXPORT_SYMBOL_GPL(sata_set_spd);
6427 6428
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6429 6430 6431
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6432
EXPORT_SYMBOL_GPL(ata_std_prereset);
6433
EXPORT_SYMBOL_GPL(ata_std_softreset);
6434
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6435 6436
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6437 6438
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6439
EXPORT_SYMBOL_GPL(ata_port_disable);
6440
EXPORT_SYMBOL_GPL(ata_ratelimit);
6441
EXPORT_SYMBOL_GPL(ata_wait_register);
6442
EXPORT_SYMBOL_GPL(ata_busy_sleep);
T
Tejun Heo 已提交
6443
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6444 6445 6446
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6447
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6448
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6449 6450
EXPORT_SYMBOL_GPL(ata_scsi_release);
EXPORT_SYMBOL_GPL(ata_host_intr);
6451 6452 6453 6454 6455 6456
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
EXPORT_SYMBOL_GPL(ata_port_online);
EXPORT_SYMBOL_GPL(ata_port_offline);
J
Jeff Garzik 已提交
6457 6458
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6459 6460
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6461
EXPORT_SYMBOL_GPL(ata_device_blacklisted);
L
Linus Torvalds 已提交
6462 6463
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6464
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6465 6466 6467
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6468 6469
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6470
EXPORT_SYMBOL_GPL(ata_pci_host_stop);
L
Linus Torvalds 已提交
6471 6472 6473
EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6474 6475
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6476 6477
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
A
Alan Cox 已提交
6478 6479
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6480
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6481 6482 6483

EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
6484 6485

EXPORT_SYMBOL_GPL(ata_eng_timeout);
6486 6487
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6488 6489 6490
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6491 6492
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6493
EXPORT_SYMBOL_GPL(ata_do_eh);