libata-core.c 170.2 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 */

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

#include "libata.h"

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

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struct workqueue_struct *ata_aux_wq;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;		/* nothing found */
}

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

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

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

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

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

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
 *	@ap: ATA channel to examine
 *	@device: Device to examine (starting at zero)
699
 *	@r_err: Value of error register on completion
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
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 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

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unsigned int
718
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);
729
	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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}

/**
755
 *	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;
	}
}

788
/**
789
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
790 791 792 793 794
 *	@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.
 *
795
 *	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));

809
	ata_id_string(id, s, ofs, len - 1);
810 811 812 813 814 815

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

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

	return ++sectors;
}

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

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

	return ++sectors;
}

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

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

	ata_tf_init(dev, &tf);

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

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

	return ata_tf_to_lba48(&tf);
}

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

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

	ata_tf_init(dev, &tf);

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

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

	return ata_tf_to_lba(&tf);
}

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

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

	new_sectors--;

	ata_tf_init(dev, &tf);

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

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

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

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

	return ata_tf_to_lba48(&tf);
}

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

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

	new_sectors--;

	ata_tf_init(dev, &tf);

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

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

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

	return ata_tf_to_lba(&tf);
}

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

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

	if (hpa_sectors > sectors) {
		ata_dev_printk(dev, KERN_INFO,
			"Host Protected Area detected:\n"
			"\tcurrent size: %lld sectors\n"
			"\tnative size: %lld sectors\n",
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			(long long)sectors, (long long)hpa_sectors);
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		if (ata_ignore_hpa) {
			if (ata_id_has_lba48(dev->id))
				hpa_sectors = ata_set_native_max_address_ext(dev, hpa_sectors);
			else
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				hpa_sectors = ata_set_native_max_address(dev,
								hpa_sectors);
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			if (hpa_sectors) {
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				ata_dev_printk(dev, KERN_INFO, "native size "
					"increased to %lld sectors\n",
					(long long)hpa_sectors);
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				return hpa_sectors;
			}
		}
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	} else if (hpa_sectors < sectors)
		ata_dev_printk(dev, KERN_WARNING, "%s 1: hpa sectors (%lld) "
			       "is smaller than sectors (%lld)\n", __FUNCTION__,
			       (long long)hpa_sectors, (long long)sectors);

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	return sectors;
}

1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
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];
	}
}

1032 1033 1034
/**
 *	ata_id_to_dma_mode	-	Identify DMA mode from id block
 *	@dev: device to identify
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 *	@unknown: mode to assume if we cannot tell
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 *
 *	Set up the timing values for the device based upon the identify
 *	reported values for the DMA mode. This function is used by drivers
 *	which rely upon firmware configured modes, but wish to report the
 *	mode correctly when possible.
 *
 *	In addition we emit similarly formatted messages to the default
 *	ata_dev_set_mode handler, in order to provide consistency of
 *	presentation.
 */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1159
 *	@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",
1175 1176 1177 1178 1179
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1180 1181 1182 1183 1184
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1185 1186 1187 1188 1189
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1190 1191
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1192 1193
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1194 1195
}

1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
/**
 *	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.
		 */
1225
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1226 1227 1228 1229
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239

		/* 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;
1240

1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
	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);
	}

1258 1259 1260
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1261 1262 1263 1264

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1265 1266 1267
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1268
 *	@fn: workqueue function to be scheduled
1269
 *	@data: data for @fn to use
1270
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
 *
 *	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.
 */
1284
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1285 1286
			 unsigned long delay)
{
1287 1288
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
Tejun Heo 已提交
1289

1290 1291
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
}

/**
 *	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)
{
	DPRINTK("ENTER\n");

1308
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1309

1310 1311
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
Tejun Heo 已提交
1312 1313
}

1314
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1315
{
1316
	struct completion *waiting = qc->private_data;
1317 1318 1319 1320 1321

	complete(waiting);
}

/**
1322
 *	ata_exec_internal_sg - execute libata internal command
1323 1324
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1325
 *	@cdb: CDB for packet command
1326
 *	@dma_dir: Data tranfer direction of the command
1327 1328
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1329 1330 1331 1332 1333 1334 1335 1336 1337
 *
 *	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.
1338 1339 1340
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1341
 */
1342 1343 1344 1345
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)
1346
{
T
Tejun Heo 已提交
1347
	struct ata_port *ap = dev->ap;
1348 1349
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1350
	unsigned int tag, preempted_tag;
1351
	u32 preempted_sactive, preempted_qc_active;
1352
	DECLARE_COMPLETION_ONSTACK(wait);
1353
	unsigned long flags;
1354
	unsigned int err_mask;
1355
	int rc;
1356

1357
	spin_lock_irqsave(ap->lock, flags);
1358

1359
	/* no internal command while frozen */
1360
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1361
		spin_unlock_irqrestore(ap->lock, flags);
1362 1363 1364
		return AC_ERR_SYSTEM;
	}

1365
	/* initialize internal qc */
1366

1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
	/* 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;

1377
	if (test_and_set_bit(tag, &ap->qc_allocated))
1378
		BUG();
1379
	qc = __ata_qc_from_tag(ap, tag);
1380 1381 1382 1383 1384 1385 1386 1387

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

	preempted_tag = ap->active_tag;
1388 1389
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1390
	ap->active_tag = ATA_TAG_POISON;
1391 1392
	ap->sactive = 0;
	ap->qc_active = 0;
1393 1394

	/* prepare & issue qc */
1395
	qc->tf = *tf;
1396 1397
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1398
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1399 1400
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1401 1402 1403 1404 1405 1406
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1407
		qc->nbytes = buflen;
1408 1409
	}

1410
	qc->private_data = &wait;
1411 1412
	qc->complete_fn = ata_qc_complete_internal;

1413
	ata_qc_issue(qc);
1414

1415
	spin_unlock_irqrestore(ap->lock, flags);
1416

A
Andrew Morton 已提交
1417
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1418 1419

	ata_port_flush_task(ap);
1420

1421
	if (!rc) {
1422
		spin_lock_irqsave(ap->lock, flags);
1423 1424 1425

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1426 1427
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1428
		 */
1429
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1430 1431 1432 1433 1434 1435
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1436

1437 1438
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1439
					"qc timeout (cmd 0x%x)\n", command);
1440 1441
		}

1442
		spin_unlock_irqrestore(ap->lock, flags);
1443 1444
	}

1445 1446 1447 1448
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

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

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1459 1460
	}

1461
	/* finish up */
1462
	spin_lock_irqsave(ap->lock, flags);
1463

1464
	*tf = qc->result_tf;
1465 1466 1467
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1468
	ap->active_tag = preempted_tag;
1469 1470
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1471

1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
	/* 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.
	 */
1483
	if (ap->flags & ATA_FLAG_DISABLED) {
1484 1485 1486 1487
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1488
	spin_unlock_irqrestore(ap->lock, flags);
1489

1490
	return err_mask;
1491 1492
}

1493
/**
1494
 *	ata_exec_internal - execute libata internal command
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
 *	@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)
{
1515 1516
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1517

1518 1519 1520 1521 1522 1523
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1524

1525
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1526 1527
}

1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540
/**
 *	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
1541
 */
1542
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1543 1544 1545 1546 1547 1548 1549 1550 1551
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1552
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1553 1554
}

1555 1556 1557 1558 1559 1560 1561
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
J
Jeff Garzik 已提交
1562

1563 1564
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1565 1566 1567
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
	if (adev->ap->flags & ATA_FLAG_NO_IORDY)
1568
		return 0;
A
Alan Cox 已提交
1569 1570 1571 1572 1573
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1574
		return 1;
A
Alan Cox 已提交
1575 1576
	return 0;
}
1577

A
Alan Cox 已提交
1578 1579 1580 1581 1582 1583 1584
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
J
Jeff Garzik 已提交
1585

A
Alan Cox 已提交
1586 1587
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1588 1589
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1590
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1591 1592 1593 1594
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1595 1596
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1597 1598
		}
	}
A
Alan Cox 已提交
1599
	return 3 << ATA_SHIFT_PIO;
1600 1601
}

L
Linus Torvalds 已提交
1602
/**
1603 1604 1605
 *	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)
1606
 *	@flags: ATA_READID_* flags
1607
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1608
 *
1609 1610
 *	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
1611 1612
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1613 1614
 *
 *	LOCKING:
1615 1616 1617 1618
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1619
 */
1620
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1621
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1622
{
T
Tejun Heo 已提交
1623
	struct ata_port *ap = dev->ap;
1624
	unsigned int class = *p_class;
1625
	struct ata_taskfile tf;
1626 1627
	unsigned int err_mask = 0;
	const char *reason;
1628
	int may_fallback = 1, tried_spinup = 0;
1629
	int rc;
L
Linus Torvalds 已提交
1630

1631
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1632
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1633

1634 1635
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1636
	ata_tf_init(dev, &tf);
1637

1638 1639
	switch (class) {
	case ATA_DEV_ATA:
1640
		tf.command = ATA_CMD_ID_ATA;
1641 1642
		break;
	case ATA_DEV_ATAPI:
1643
		tf.command = ATA_CMD_ID_ATAPI;
1644 1645 1646 1647 1648
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1649 1650
	}

1651
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661

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

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1662

T
Tejun Heo 已提交
1663
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1664
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1665
	if (err_mask) {
1666
		if (err_mask & AC_ERR_NODEV_HINT) {
1667
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1668
				ap->print_id, dev->devno);
1669 1670 1671
			return -ENOENT;
		}

1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
		/* Device or controller might have reported the wrong
		 * device class.  Give a shot at the other IDENTIFY if
		 * the current one is aborted by the device.
		 */
		if (may_fallback &&
		    (err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			may_fallback = 0;

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

1687 1688
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1689 1690 1691
		goto err_out;
	}

1692 1693 1694 1695 1696
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1697
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1698

1699
	/* sanity check */
1700
	rc = -EINVAL;
A
Alan Cox 已提交
1701
	reason = "device reports invalid type";
1702 1703 1704 1705 1706 1707 1708

	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;
1709 1710
	}

1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
		tried_spinup = 1;
		/*
		 * Drive powered-up in standby mode, and requires a specific
		 * SET_FEATURES spin-up subcommand before it will accept
		 * anything other than the original IDENTIFY command.
		 */
		ata_tf_init(dev, &tf);
		tf.command = ATA_CMD_SET_FEATURES;
		tf.feature = SETFEATURES_SPINUP;
		tf.protocol = ATA_PROT_NODATA;
		tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
		err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
		if (err_mask) {
			rc = -EIO;
			reason = "SPINUP failed";
			goto err_out;
		}
		/*
		 * If the drive initially returned incomplete IDENTIFY info,
		 * we now must reissue the IDENTIFY command.
		 */
		if (id[2] == 0x37c8)
			goto retry;
	}

1737
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1738 1739 1740 1741 1742 1743 1744 1745 1746
		/*
		 * 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
1747
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1748 1749 1750 1751 1752 1753 1754 1755 1756
			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.
			 */
1757
			flags &= ~ATA_READID_POSTRESET;
1758 1759 1760 1761 1762
			goto retry;
		}
	}

	*p_class = class;
1763

1764 1765 1766
	return 0;

 err_out:
T
Tejun Heo 已提交
1767
	if (ata_msg_warn(ap))
1768
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1769
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1770 1771 1772
	return rc;
}

T
Tejun Heo 已提交
1773
static inline u8 ata_dev_knobble(struct ata_device *dev)
1774
{
T
Tejun Heo 已提交
1775
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1776 1777
}

1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
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;
	}
T
Tejun Heo 已提交
1788
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
1789 1790 1791
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1792
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1793
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1794 1795 1796 1797 1798 1799 1800 1801 1802
		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);
}

1803
/**
1804 1805 1806 1807 1808
 *	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.
1809 1810
 *
 *	LOCKING:
1811 1812 1813 1814
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1815
 */
1816
int ata_dev_configure(struct ata_device *dev)
1817
{
T
Tejun Heo 已提交
1818
	struct ata_port *ap = dev->ap;
T
Tejun Heo 已提交
1819 1820
	struct ata_eh_context *ehc = &ap->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1821
	const u16 *id = dev->id;
1822
	unsigned int xfer_mask;
1823
	char revbuf[7];		/* XYZ-99\0 */
1824 1825
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1826
	int rc;
1827

1828
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1829 1830
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1831
		return 0;
1832 1833
	}

1834
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1835
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1836

T
Tejun Heo 已提交
1837 1838 1839
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
1840 1841 1842 1843
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1844

1845
	/* print device capabilities */
1846
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1847 1848 1849
		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",
1850
			       __FUNCTION__,
1851 1852
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1853

1854
	/* initialize to-be-configured parameters */
1855
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1856 1857 1858 1859 1860 1861 1862
	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
1863 1864 1865 1866
	/*
	 * common ATA, ATAPI feature tests
	 */

1867
	/* find max transfer mode; for printk only */
1868
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1869

1870 1871
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1872

1873 1874 1875 1876 1877 1878 1879
	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
			sizeof(fwrevbuf));

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

L
Linus Torvalds 已提交
1880 1881
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1882 1883
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1884 1885 1886
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1887 1888 1889 1890 1891
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1892
		dev->n_sectors = ata_id_n_sectors(id);
1893

1894 1895 1896
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1897
		if (ata_id_has_lba(id)) {
1898
			const char *lba_desc;
1899
			char ncq_desc[20];
1900

1901 1902
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1903
			if (ata_id_has_lba48(id)) {
1904
				dev->flags |= ATA_DFLAG_LBA48;
1905
				lba_desc = "LBA48";
1906 1907 1908 1909

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1910
			}
1911

A
Alan Cox 已提交
1912 1913 1914
			if (ata_id_hpa_enabled(dev->id))
				dev->n_sectors = ata_hpa_resize(dev);

1915 1916 1917
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1918
			/* print device info to dmesg */
1919 1920 1921 1922 1923 1924 1925
			if (ata_msg_drv(ap) && print_info) {
				ata_dev_printk(dev, KERN_INFO,
					"%s: %s, %s, max %s\n",
					revbuf, modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
				ata_dev_printk(dev, KERN_INFO,
					"%Lu sectors, multi %u: %s %s\n",
1926
					(unsigned long long)dev->n_sectors,
1927 1928
					dev->multi_count, lba_desc, ncq_desc);
			}
1929
		} else {
1930 1931 1932
			/* CHS */

			/* Default translation */
1933 1934 1935
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1936

1937
			if (ata_id_current_chs_valid(id)) {
1938
				/* Current CHS translation is valid. */
1939 1940 1941
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1942 1943 1944
			}

			/* print device info to dmesg */
1945
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1946
				ata_dev_printk(dev, KERN_INFO,
1947 1948 1949
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1950
				ata_dev_printk(dev, KERN_INFO,
1951 1952 1953 1954 1955
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1956 1957
		}

1958
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1959 1960 1961
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1962
	else if (dev->class == ATA_DEV_ATAPI) {
1963 1964
		char *cdb_intr_string = "";

1965
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1966
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1967
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1968 1969
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1970
			rc = -EINVAL;
L
Linus Torvalds 已提交
1971 1972
			goto err_out_nosup;
		}
1973
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1974

1975
		if (ata_id_cdb_intr(dev->id)) {
1976
			dev->flags |= ATA_DFLAG_CDB_INTR;
1977 1978
			cdb_intr_string = ", CDB intr";
		}
1979

L
Linus Torvalds 已提交
1980
		/* print device info to dmesg */
1981
		if (ata_msg_drv(ap) && print_info)
1982 1983 1984
			ata_dev_printk(dev, KERN_INFO,
				       "ATAPI: %s, %s, max %s%s\n",
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
1985 1986
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1987 1988
	}

1989 1990 1991 1992 1993
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
	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");
		}
	}

2006
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2007
	if (ata_dev_knobble(dev)) {
2008
		if (ata_msg_drv(ap) && print_info)
2009 2010
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2011
		dev->udma_mask &= ATA_UDMA5;
2012 2013 2014
		dev->max_sectors = ATA_MAX_SECTORS;
	}

T
Tejun Heo 已提交
2015
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2016 2017
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2018

2019
	if (ap->ops->dev_config)
2020
		ap->ops->dev_config(dev);
2021

2022 2023 2024
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2025
	return 0;
L
Linus Torvalds 已提交
2026 2027

err_out_nosup:
2028
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2029 2030
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2031
	return rc;
L
Linus Torvalds 已提交
2032 2033
}

A
Alan Cox 已提交
2034
/**
2035
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2036 2037
 *	@ap: port
 *
2038
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2039 2040 2041 2042 2043 2044 2045 2046 2047
 *	detection.
 */

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

/**
2048
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2049 2050
 *	@ap: port
 *
2051
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083
 *	detection.
 */

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

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

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

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

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

L
Linus Torvalds 已提交
2084 2085 2086 2087
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2088 2089 2090 2091
 *	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
2092
 *	LOCKING:
J
Jeff Garzik 已提交
2093
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2094 2095
 *
 *	RETURNS:
2096
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2097 2098
 */

2099
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2100
{
2101
	unsigned int classes[ATA_MAX_DEVICES];
2102
	int tries[ATA_MAX_DEVICES];
2103
	int i, rc;
2104
	struct ata_device *dev;
L
Linus Torvalds 已提交
2105

2106
	ata_port_probe(ap);
2107

2108 2109 2110 2111
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
2112
	/* reset and determine device classes */
2113
	ap->ops->phy_reset(ap);
2114

2115 2116
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
2117

2118 2119 2120 2121 2122
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2123

2124
		dev->class = ATA_DEV_UNKNOWN;
2125
	}
L
Linus Torvalds 已提交
2126

2127
	ata_port_probe(ap);
2128

A
Alan Cox 已提交
2129 2130 2131 2132 2133 2134
	/* 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;

2135 2136 2137 2138 2139
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

	for (i = ATA_MAX_DEVICES - 1; i >=  0; i--) {
2140
		dev = &ap->device[i];
2141

2142 2143
		if (tries[i])
			dev->class = classes[i];
2144

2145
		if (!ata_dev_enabled(dev))
2146 2147
			continue;

2148 2149
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2150 2151
		if (rc)
			goto fail;
2152 2153
	}

A
Alan Cox 已提交
2154 2155 2156 2157
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

2158 2159 2160 2161 2162 2163 2164
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

	for(i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;
2165

2166 2167 2168
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2169 2170
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2171 2172
	}

2173
	/* configure transfer mode */
2174
	rc = ata_set_mode(ap, &dev);
2175
	if (rc)
2176
		goto fail;
L
Linus Torvalds 已提交
2177

2178 2179 2180
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
2181

2182 2183
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
2184
	ap->ops->port_disable(ap);
2185
	return -ENODEV;
2186 2187

 fail:
2188 2189
	tries[dev->devno]--;

2190 2191
	switch (rc) {
	case -EINVAL:
2192
		/* eeek, something went very wrong, give up */
2193 2194
		tries[dev->devno] = 0;
		break;
2195 2196 2197 2198

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2199
	case -EIO:
2200 2201 2202 2203 2204 2205 2206
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
			sata_down_spd_limit(ap);
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2207 2208
	}

2209
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2210
		ata_dev_disable(dev);
2211

2212
	goto retry;
L
Linus Torvalds 已提交
2213 2214 2215
}

/**
J
Jeff Garzik 已提交
2216 2217
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2218
 *
J
Jeff Garzik 已提交
2219 2220 2221
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2222
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2223
 *	serialization.
L
Linus Torvalds 已提交
2224 2225 2226 2227
 */

void ata_port_probe(struct ata_port *ap)
{
2228
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2229 2230
}

2231 2232 2233 2234 2235 2236 2237 2238 2239
/**
 *	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.
 */
2240
void sata_print_link_status(struct ata_port *ap)
2241
{
2242
	u32 sstatus, scontrol, tmp;
2243

2244
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2245
		return;
2246
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2247

2248
	if (ata_port_online(ap)) {
2249
		tmp = (sstatus >> 4) & 0xf;
2250 2251 2252
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2253
	} else {
2254 2255 2256
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2257 2258 2259
	}
}

L
Linus Torvalds 已提交
2260
/**
J
Jeff Garzik 已提交
2261 2262
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2263
 *
J
Jeff Garzik 已提交
2264 2265 2266
 *	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
2267 2268
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2269
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2270 2271 2272 2273 2274 2275 2276 2277
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2278
		/* issue phy wake/reset */
2279
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2280 2281 2282
		/* 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
2283
	}
2284 2285
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2286 2287 2288 2289

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2290
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2291 2292 2293 2294
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2295 2296
	/* print link status */
	sata_print_link_status(ap);
2297

2298
	/* TODO: phy layer with polling, timeouts, etc. */
2299
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2300
		ata_port_probe(ap);
2301
	else
L
Linus Torvalds 已提交
2302 2303
		ata_port_disable(ap);

2304
	if (ap->flags & ATA_FLAG_DISABLED)
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2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
		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
2316 2317
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2318
 *
J
Jeff Garzik 已提交
2319 2320
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2321 2322
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2323
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2324 2325 2326 2327 2328
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2329
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2330 2331 2332 2333
		return;
	ata_bus_reset(ap);
}

2334 2335 2336 2337 2338 2339 2340
/**
 *	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
 */
2341

T
Tejun Heo 已提交
2342
struct ata_device *ata_dev_pair(struct ata_device *adev)
2343
{
T
Tejun Heo 已提交
2344
	struct ata_port *ap = adev->ap;
2345
	struct ata_device *pair = &ap->device[1 - adev->devno];
2346
	if (!ata_dev_enabled(pair))
2347 2348 2349 2350
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2351
/**
J
Jeff Garzik 已提交
2352 2353
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2354
 *
J
Jeff Garzik 已提交
2355 2356 2357 2358 2359
 *	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
2360
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2361
 *	serialization.
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2362 2363 2364 2365 2366 2367
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2368
	ap->flags |= ATA_FLAG_DISABLED;
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Linus Torvalds 已提交
2369 2370
}

2371
/**
2372
 *	sata_down_spd_limit - adjust SATA spd limit downward
2373 2374 2375 2376
 *	@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
2377
 *	using sata_set_spd().
2378 2379 2380 2381 2382 2383 2384
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2385
int sata_down_spd_limit(struct ata_port *ap)
2386
{
2387 2388
	u32 sstatus, spd, mask;
	int rc, highbit;
2389

2390 2391 2392
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
	if (rc)
		return rc;
2393 2394 2395 2396 2397 2398 2399

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

2400
	spd = (sstatus >> 4) & 0xf;
2401 2402 2403 2404 2405 2406 2407 2408 2409
	if (spd <= 1)
		return -EINVAL;
	spd--;
	mask &= (1 << spd) - 1;
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2410 2411
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2412 2413 2414 2415

	return 0;
}

2416
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
{
	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;
}

/**
2432
 *	sata_set_spd_needed - is SATA spd configuration needed
2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445
 *	@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.
 */
2446
int sata_set_spd_needed(struct ata_port *ap)
2447 2448 2449
{
	u32 scontrol;

2450
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2451 2452
		return 0;

2453
	return __sata_set_spd_needed(ap, &scontrol);
2454 2455 2456
}

/**
2457
 *	sata_set_spd - set SATA spd according to spd limit
2458 2459 2460 2461 2462 2463 2464 2465 2466
 *	@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
2467
 *	changed.  Negative errno if SCR registers are inaccessible.
2468
 */
2469
int sata_set_spd(struct ata_port *ap)
2470 2471
{
	u32 scontrol;
2472
	int rc;
2473

2474 2475
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2476

2477
	if (!__sata_set_spd_needed(ap, &scontrol))
2478 2479
		return 0;

2480 2481 2482
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2483 2484 2485
	return 1;
}

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Alan Cox 已提交
2486 2487 2488 2489 2490
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2491
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2492
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2493 2494 2495
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
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2496 2497 2498 2499 2500 2501 2502 2503 2504
 */

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 },

2505 2506
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
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2507 2508 2509 2510 2511
	{ 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 }, */
2512

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2513 2514 2515
	{ 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 },
2516

A
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2517 2518 2519 2520
	{ 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 },

2521 2522
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
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Alan Cox 已提交
2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
	{ 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
2568
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2569
			return NULL;
2570
	return t;
A
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2571 2572 2573 2574 2575 2576 2577 2578 2579
}

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;

	/*
2580
	 * Find the mode.
2581
	 */
A
Alan Cox 已提交
2582 2583 2584 2585

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

2586 2587
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607
	/*
	 * 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.
	 */

2608
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2609 2610

	/*
2611 2612 2613
	 * 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
2614 2615
	 */

2616
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2617 2618 2619 2620 2621
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2622
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633
	 */

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

	if (t->active + t->recover < t->cycle) {
		t->active += (t->cycle - (t->active + t->recover)) / 2;
		t->recover = t->cycle - t->active;
	}
J
Jeff Garzik 已提交
2634

2635 2636 2637 2638 2639
	/* In a few cases quantisation may produce enough errors to
	   leave t->cycle too low for the sum of active and recovery
	   if so we must correct this */
	if (t->active + t->recover > t->cycle)
		t->cycle = t->active + t->recover;
A
Alan Cox 已提交
2640 2641 2642 2643

	return 0;
}

2644 2645 2646
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2647
 *	@sel: ATA_DNXFER_* selector
2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658
 *
 *	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
 */
2659
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2660
{
2661 2662 2663 2664
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2665

2666 2667
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2668

2669 2670 2671 2672
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
2673

2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

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

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

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

	default:
		BUG();
	}

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

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

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

		ata_dev_printk(dev, KERN_WARNING,
			       "limiting speed to %s\n", buf);
	}
2726 2727 2728 2729 2730 2731 2732

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

	return 0;
}

T
Tejun Heo 已提交
2733
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2734
{
2735
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2736 2737
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2738

2739
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2740 2741 2742
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2743
	err_mask = ata_dev_set_xfermode(dev);
2744 2745 2746 2747
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
        	err_mask &= ~AC_ERR_DEV;

2748
	if (err_mask) {
2749 2750
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2751 2752
		return -EIO;
	}
L
Linus Torvalds 已提交
2753

2754
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2755
	rc = ata_dev_revalidate(dev, 0);
2756
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2757
	if (rc)
2758
		return rc;
2759

2760 2761
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2762

2763 2764
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2765
	return 0;
L
Linus Torvalds 已提交
2766 2767 2768
}

/**
2769
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
L
Linus Torvalds 已提交
2770
 *	@ap: port on which timings will be programmed
2771
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2772
 *
2773 2774 2775
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
2776
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2777
 *
L
Linus Torvalds 已提交
2778
 *	LOCKING:
J
Jeff Garzik 已提交
2779
 *	PCI/etc. bus probe sem.
2780 2781 2782
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2783
 */
2784 2785

int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2786
{
2787
	struct ata_device *dev;
2788
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2789

2790

2791 2792
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2793
		unsigned int pio_mask, dma_mask;
2794

2795 2796
		dev = &ap->device[i];

2797
		if (!ata_dev_enabled(dev))
2798 2799
			continue;

T
Tejun Heo 已提交
2800
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2801

2802 2803 2804 2805
		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);
2806

2807
		found = 1;
2808 2809
		if (dev->dma_mode)
			used_dma = 1;
2810
	}
2811
	if (!found)
2812
		goto out;
2813 2814

	/* step 2: always set host PIO timings */
2815 2816 2817 2818 2819 2820
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2821
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2822
			rc = -EINVAL;
2823
			goto out;
2824 2825 2826 2827 2828 2829 2830
		}

		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
2831

2832
	/* step 3: set host DMA timings */
2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843
	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
2844 2845

	/* step 4: update devices' xfer mode */
2846
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2847
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2848

A
Alan 已提交
2849
		/* don't update suspended devices' xfer mode */
2850
		if (!ata_dev_enabled(dev))
2851 2852
			continue;

T
Tejun Heo 已提交
2853
		rc = ata_dev_set_mode(dev);
2854
		if (rc)
2855
			goto out;
2856
	}
L
Linus Torvalds 已提交
2857

2858 2859
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2860
	 */
J
Jeff Garzik 已提交
2861
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2862
		ap->host->simplex_claimed = ap;
2863

2864 2865 2866 2867
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2868 2869
}

2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892
/**
 *	ata_set_mode - Program timings and issue SET FEATURES - XFER
 *	@ap: port on which timings will be programmed
 *	@r_failed_dev: out paramter for failed device
 *
 *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_set_mode() fails, pointer to the failing device is
 *	returned in @r_failed_dev.
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
{
	/* has private set_mode? */
	if (ap->ops->set_mode)
		return ap->ops->set_mode(ap, r_failed_dev);
	return ata_do_set_mode(ap, r_failed_dev);
}

2893 2894 2895 2896 2897 2898 2899 2900 2901 2902
/**
 *	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
2903
 *	spin_lock_irqsave(host lock)
2904 2905 2906 2907 2908 2909 2910 2911 2912
 */

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
2913 2914 2915 2916 2917 2918
/**
 *	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
2919 2920 2921
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2922 2923 2924 2925 2926
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2927
 */
2928 2929
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2930 2931 2932 2933 2934 2935 2936
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2937 2938
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2939 2940 2941 2942
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2943
	if (status != 0xff && (status & ATA_BUSY))
2944
		ata_port_printk(ap, KERN_WARNING,
2945 2946
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2947 2948

	timeout = timer_start + tmout;
2949 2950
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2951 2952 2953 2954
		msleep(50);
		status = ata_chk_status(ap);
	}

2955 2956 2957
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2958
	if (status & ATA_BUSY) {
2959
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2960 2961
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2962
		return -EBUSY;
L
Linus Torvalds 已提交
2963 2964 2965 2966 2967
	}

	return 0;
}

2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992
/**
 *	ata_wait_ready - sleep until BSY clears, or timeout
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	Sleep until ATA Status register bit BSY clears, or timeout
 *	occurs.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
{
	unsigned long start = jiffies;
	int warned = 0;

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

		if (!(status & ATA_BUSY))
			return 0;
2993
		if (!ata_port_online(ap) && status == 0xff)
2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011
			return -ENODEV;
		if (time_after(now, deadline))
			return -EBUSY;

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

		msleep(50);
	}
}

static int ata_bus_post_reset(struct ata_port *ap, unsigned int devmask,
			      unsigned long deadline)
L
Linus Torvalds 已提交
3012 3013 3014 3015
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3016
	int rc, ret = 0;
L
Linus Torvalds 已提交
3017 3018 3019 3020

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3021 3022
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3023 3024 3025 3026 3027
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3028
	}
L
Linus Torvalds 已提交
3029

3030 3031
	/* if device 1 was found in ata_devchk, wait for register
	 * access briefly, then wait for BSY to clear.
L
Linus Torvalds 已提交
3032
	 */
3033 3034
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3035 3036

		ap->ops->dev_select(ap, 1);
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051

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

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

3052
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3053 3054 3055 3056 3057
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3058
	}
L
Linus Torvalds 已提交
3059 3060 3061 3062 3063 3064 3065

	/* 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);
3066

T
Tejun Heo 已提交
3067
	return ret;
L
Linus Torvalds 已提交
3068 3069
}

3070 3071
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3072 3073 3074
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3075
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3076 3077

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3078 3079 3080 3081 3082
	iowrite8(ap->ctl, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
	udelay(20);	/* FIXME: flush */
	iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3083 3084 3085 3086 3087 3088 3089 3090

	/* 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.
3091 3092
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3093 3094 3095
	 */
	msleep(150);

3096
	/* Before we perform post reset processing we want to see if
3097 3098 3099
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3100
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3101
		return -ENODEV;
3102

3103
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118
}

/**
 *	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
3119
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3120
 *	Obtains host lock.
L
Linus Torvalds 已提交
3121 3122
 *
 *	SIDE EFFECTS:
3123
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3124 3125 3126 3127 3128 3129 3130
 */

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
3131
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3132
	int rc;
L
Linus Torvalds 已提交
3133

T
Tejun Heo 已提交
3134
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153

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

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

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

	/* issue bus reset */
T
Tejun Heo 已提交
3154 3155 3156
	if (ap->flags & ATA_FLAG_SRST) {
		rc = ata_bus_softreset(ap, devmask, jiffies + 40 * HZ);
		if (rc && rc != -ENODEV)
T
Tejun Heo 已提交
3157
			goto err_out;
T
Tejun Heo 已提交
3158
	}
L
Linus Torvalds 已提交
3159 3160 3161 3162

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3163
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
3164
	if ((slave_possible) && (err != 0x81))
3165
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179

	/* is double-select really necessary? */
	if (ap->device[1].class != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 1);
	if (ap->device[0].class != ATA_DEV_NONE)
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
	if ((ap->device[0].class == ATA_DEV_NONE) &&
	    (ap->device[1].class == ATA_DEV_NONE))
		goto err_out;

	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
		/* set up device control for ATA_FLAG_SATA_RESET */
T
Tejun Heo 已提交
3180
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3181 3182 3183 3184 3185 3186
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3187
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
3188 3189 3190 3191 3192
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

3193 3194 3195 3196
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3197
 *	@deadline: deadline jiffies for the operation
3198 3199 3200 3201
 *
 *	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
3202 3203
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3204 3205
 *	until timeout then returns 0 if DET is stable at 1.
 *
3206 3207 3208
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3209 3210 3211 3212 3213 3214
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3215 3216
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
		      unsigned long deadline)
3217
{
3218
	unsigned long interval_msec = params[0];
3219 3220
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3221 3222 3223
	u32 last, cur;
	int rc;

3224 3225 3226 3227
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
	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) {
3243
			if (cur == 1 && time_before(jiffies, deadline))
3244 3245 3246 3247 3248 3249 3250 3251 3252 3253
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3254 3255
		/* check deadline */
		if (time_after(jiffies, deadline))
3256 3257 3258 3259 3260 3261 3262 3263
			return -EBUSY;
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3264
 *	@deadline: deadline jiffies for the operation
3265 3266 3267 3268 3269 3270 3271 3272 3273
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3274 3275
int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
		    unsigned long deadline)
3276 3277
{
	u32 scontrol;
3278 3279 3280 3281
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
3282

3283
	scontrol = (scontrol & 0x0f0) | 0x300;
3284 3285 3286

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
3287

3288 3289 3290 3291
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3292

3293
	return sata_phy_debounce(ap, params, deadline);
3294 3295
}

3296 3297 3298
/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
3299
 *	@deadline: deadline jiffies for the operation
3300
 *
T
Tejun Heo 已提交
3301 3302 3303 3304 3305
 *	@ap is about to be reset.  Initialize it.  Failure from
 *	prereset makes libata abort whole reset sequence and give up
 *	that port, so prereset should be best-effort.  It does its
 *	best to prepare for reset sequence but if things go wrong, it
 *	should just whine, not fail.
3306 3307 3308 3309 3310 3311 3312
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3313
int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
3314 3315
{
	struct ata_eh_context *ehc = &ap->eh_context;
3316
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3317 3318
	int rc;

T
Tejun Heo 已提交
3319
	/* handle link resume */
3320 3321 3322 3323
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

3324 3325 3326 3327 3328
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

	/* if SATA, resume phy */
3329
	if (ap->flags & ATA_FLAG_SATA) {
3330
		rc = sata_phy_resume(ap, timing, deadline);
T
Tejun Heo 已提交
3331 3332
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3333 3334 3335 3336 3337 3338 3339
			ata_port_printk(ap, KERN_WARNING, "failed to resume "
					"link for reset (errno=%d)\n", rc);
	}

	/* Wait for !BSY if the controller can wait for the first D2H
	 * Reg FIS and we don't know that no device is attached.
	 */
T
Tejun Heo 已提交
3340 3341
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
		rc = ata_wait_ready(ap, deadline);
3342
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3343 3344 3345 3346 3347
			ata_port_printk(ap, KERN_WARNING, "device not ready "
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3348 3349 3350 3351

	return 0;
}

3352 3353 3354 3355
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
3356
 *	@deadline: deadline jiffies for the operation
3357
 *
3358
 *	Reset host port using ATA SRST.
3359 3360 3361 3362 3363 3364 3365
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3366 3367
int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
		      unsigned long deadline)
3368 3369
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3370 3371
	unsigned int devmask = 0;
	int rc;
3372 3373 3374 3375
	u8 err;

	DPRINTK("ENTER\n");

3376
	if (ata_port_offline(ap)) {
3377 3378 3379 3380
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391
	/* 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);
3392
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3393 3394
	/* if link is occupied, -ENODEV too is an error */
	if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
3395 3396
		ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
		return rc;
3397 3398 3399 3400 3401 3402 3403
	}

	/* 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);

3404
 out:
3405 3406 3407 3408 3409
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3410
 *	sata_port_hardreset - reset port via SATA phy reset
3411
 *	@ap: port to reset
3412
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3413
 *	@deadline: deadline jiffies for the operation
3414 3415 3416 3417 3418 3419 3420 3421 3422
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3423 3424
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
			unsigned long deadline)
3425
{
3426
	u32 scontrol;
3427
	int rc;
3428

3429 3430
	DPRINTK("ENTER\n");

3431
	if (sata_set_spd_needed(ap)) {
3432 3433 3434 3435 3436
		/* 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.
		 */
3437
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3438
			goto out;
3439

3440
		scontrol = (scontrol & 0x0f0) | 0x304;
3441 3442

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3443
			goto out;
3444

3445
		sata_set_spd(ap);
3446 3447 3448
	}

	/* issue phy wake/reset */
3449
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3450
		goto out;
3451

3452
	scontrol = (scontrol & 0x0f0) | 0x301;
3453 3454

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3455
		goto out;
3456

3457
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3458 3459 3460 3461
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3462
	/* bring phy back */
3463
	rc = sata_phy_resume(ap, timing, deadline);
3464 3465 3466 3467 3468 3469 3470 3471 3472
 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
3473
 *	@deadline: deadline jiffies for the operation
3474 3475 3476 3477 3478 3479 3480 3481 3482 3483
 *
 *	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.
 */
3484 3485
int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
		       unsigned long deadline)
3486 3487 3488 3489 3490 3491 3492
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
3493
	rc = sata_port_hardreset(ap, timing, deadline);
3494 3495 3496 3497 3498
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3499 3500

	/* TODO: phy layer with polling, timeouts, etc. */
3501
	if (ata_port_offline(ap)) {
3502 3503 3504 3505 3506
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3507 3508 3509
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3510
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3511 3512
	/* link occupied, -ENODEV too is an error */
	if (rc) {
3513
		ata_port_printk(ap, KERN_ERR,
3514 3515
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3516 3517
	}

3518 3519
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539
	*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)
{
3540 3541
	u32 serror;

3542 3543 3544
	DPRINTK("ENTER\n");

	/* print link status */
3545
	sata_print_link_status(ap);
3546

3547 3548 3549 3550
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3551 3552 3553 3554 3555 3556
	/* 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);

3557 3558 3559 3560 3561 3562 3563
	/* bail out if no device is present */
	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
		DPRINTK("EXIT, no device\n");
		return;
	}

	/* set up device control */
T
Tejun Heo 已提交
3564 3565
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3566 3567 3568 3569

	DPRINTK("EXIT\n");
}

3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585
/**
 *	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
3586 3587
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3588 3589
{
	const u16 *old_id = dev->id;
3590 3591
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3592 3593

	if (dev->class != new_class) {
3594 3595
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3596 3597 3598
		return 0;
	}

3599 3600 3601 3602
	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3603 3604

	if (strcmp(model[0], model[1])) {
3605 3606
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3607 3608 3609 3610
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3611 3612
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3613 3614 3615 3616 3617 3618 3619
		return 0;
	}

	return 1;
}

/**
3620
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3621
 *	@dev: target ATA device
3622
 *	@readid_flags: read ID flags
3623 3624 3625 3626 3627 3628 3629 3630 3631 3632
 *
 *	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
 */
3633
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3634
{
3635
	unsigned int class = dev->class;
3636
	u16 *id = (void *)dev->ap->sector_buf;
3637 3638
	int rc;

3639
	/* read ID data */
3640
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3641
	if (rc)
3642
		return rc;
3643 3644

	/* is the device still there? */
3645 3646
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3647

3648
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
 *	@readid_flags: read ID flags
 *
 *	Re-read IDENTIFY page, make sure @dev is still attached to the
 *	port and reconfigure it according to the new IDENTIFY page.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags)
{
3668
	u64 n_sectors = dev->n_sectors;
3669 3670 3671 3672 3673 3674 3675 3676 3677
	int rc;

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

	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3678 3679

	/* configure device according to the new ID */
3680
	rc = ata_dev_configure(dev);
3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694
	if (rc)
		goto fail;

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

	return 0;
3695 3696

 fail:
3697
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3698 3699 3700
	return rc;
}

3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },
3738
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3739
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3740 3741
	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
				NULL,		ATA_HORKAGE_NODMA },
3742

3743
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3744
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3745

3746 3747 3748 3749 3750
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3751 3752
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3753 3754
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3755
	{ "Maxtor 6B200M0",	"BANC1BM0",	ATA_HORKAGE_NONCQ },
3756
	{ "Maxtor 6B200M0",	"BANC1B10",	ATA_HORKAGE_NONCQ },
3757 3758
	{ "HITACHI HDS7250SASUN500G 0621KTAWSD", "K2AOAJ0AHITACHI",
	 ATA_HORKAGE_NONCQ },
3759 3760
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3761 3762 3763 3764 3765
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
3766 3767
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3768
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3769
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3770
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3771
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
3772 3773 3774 3775 3776

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3777
};
3778

T
Tejun Heo 已提交
3779
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3780
{
T
Tejun Heo 已提交
3781 3782
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3783
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3784

T
Tejun Heo 已提交
3785 3786
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
3787

3788
	while (ad->model_num) {
T
Tejun Heo 已提交
3789
		if (!strcmp(ad->model_num, model_num)) {
3790 3791
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3792
			if (!strcmp(ad->model_rev, model_rev))
3793
				return ad->horkage;
3794
		}
3795
		ad++;
3796
	}
L
Linus Torvalds 已提交
3797 3798 3799
	return 0;
}

3800 3801 3802 3803 3804 3805 3806 3807 3808
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;
T
Tejun Heo 已提交
3809
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3810 3811
}

3812 3813 3814 3815
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3816 3817 3818 3819
 *	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...
3820 3821 3822 3823
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3824
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3825
{
T
Tejun Heo 已提交
3826
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3827
	struct ata_host *host = ap->host;
3828
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3829

3830
	/* controller modes available */
3831 3832 3833
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3834
	/* drive modes available */
3835 3836 3837
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3838

3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849
	/*
	 *	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));
	}

3850 3851
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3852 3853
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3854
	}
3855

3856 3857
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3858 3859 3860
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3861
	}
3862

J
Jeff Garzik 已提交
3863 3864 3865
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

3866
	if (ap->ops->mode_filter)
3867
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3868

3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
		if((ap->cbl == ATA_CBL_PATA40) ||
   		    (ata_drive_40wire(dev->id) &&
		     (ap->cbl == ATA_CBL_PATA_UNK ||
                     ap->cbl == ATA_CBL_PATA80))) {
		      	ata_dev_printk(dev, KERN_WARNING,
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

3888 3889
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3890 3891 3892 3893 3894 3895
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3896 3897 3898
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3899
 *	LOCKING:
J
Jeff Garzik 已提交
3900
 *	PCI/etc. bus probe sem.
3901 3902 3903
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3904 3905
 */

T
Tejun Heo 已提交
3906
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3907
{
3908
	struct ata_taskfile tf;
3909
	unsigned int err_mask;
L
Linus Torvalds 已提交
3910 3911 3912 3913

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

T
Tejun Heo 已提交
3914 3915 3916
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
3917
	ata_tf_init(dev, &tf);
3918 3919
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
3920
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
3921 3922
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3923

T
Tejun Heo 已提交
3924
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3925

3926 3927
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3928 3929
}

3930 3931 3932
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3933 3934
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3935 3936
 *
 *	LOCKING:
3937 3938 3939 3940
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3941
 */
T
Tejun Heo 已提交
3942 3943
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3944
{
3945
	struct ata_taskfile tf;
3946
	unsigned int err_mask;
3947 3948 3949

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3950
		return AC_ERR_INVALID;
3951 3952 3953 3954

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

T
Tejun Heo 已提交
3955
	ata_tf_init(dev, &tf);
3956 3957 3958 3959 3960
	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 */
3961

T
Tejun Heo 已提交
3962
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3963

3964 3965
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3966 3967
}

L
Linus Torvalds 已提交
3968
/**
J
Jeff Garzik 已提交
3969 3970 3971 3972
 *	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
3973 3974
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3975
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3976
 */
3977
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3978 3979
{
	struct ata_port *ap = qc->ap;
3980
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
3981
	int dir = qc->dma_dir;
3982
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
3983

3984 3985
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
3986 3987

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
3988
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
3989

J
Jeff Garzik 已提交
3990
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
3991

3992 3993 3994 3995 3996 3997 3998 3999
	/* 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) {
4000
		if (qc->n_elem)
4001
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4002 4003 4004 4005 4006 4007
		/* 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);
4008
			kunmap_atomic(addr, KM_IRQ0);
4009 4010
		}
	} else {
4011
		if (qc->n_elem)
4012
			dma_unmap_single(ap->dev,
4013 4014
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4015 4016 4017 4018 4019 4020
		/* 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
4021 4022

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4023
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4024 4025 4026 4027 4028 4029
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4030 4031 4032
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4033
 *	LOCKING:
J
Jeff Garzik 已提交
4034
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4035 4036 4037 4038 4039
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4040 4041
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4042

4043
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4044
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4045 4046

	idx = 0;
4047
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076
		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);
}
4077

4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139
/**
 *	ata_fill_sg_dumb - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command. Perform the fill
 *	so that we avoid writing any length 64K records for
 *	controllers that don't follow the spec.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 */
static void ata_fill_sg_dumb(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct scatterlist *sg;
	unsigned int idx;

	WARN_ON(qc->__sg == NULL);
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);

	idx = 0;
	ata_for_each_sg(sg, qc) {
		u32 addr, offset;
		u32 sg_len, len, blen;

 		/* 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;

			blen = len & 0xffff;
			ap->prd[idx].addr = cpu_to_le32(addr);
			if (blen == 0) {
			   /* Some PATA chipsets like the CS5530 can't
			      cope with 0x0000 meaning 64K as the spec says */
				ap->prd[idx].flags_len = cpu_to_le32(0x8000);
				blen = 0x8000;
				ap->prd[++idx].addr = cpu_to_le32(addr + 0x8000);
			}
			ap->prd[idx].flags_len = cpu_to_le32(blen);
			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);
}

L
Linus Torvalds 已提交
4140 4141 4142 4143
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4144 4145 4146 4147
 *	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
4148
 *	LOCKING:
J
Jeff Garzik 已提交
4149
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4150
 *
L
Linus Torvalds 已提交
4151 4152 4153 4154 4155 4156
 *	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;
4157 4158 4159 4160 4161 4162

	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
	if (unlikely(qc->nbytes & 15))
		return 1;
4163

L
Linus Torvalds 已提交
4164
	if (ap->ops->check_atapi_dma)
4165
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4166

4167
	return 0;
L
Linus Torvalds 已提交
4168
}
4169

L
Linus Torvalds 已提交
4170 4171 4172 4173
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4174 4175
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4176
 *	LOCKING:
J
Jeff Garzik 已提交
4177
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4178 4179 4180 4181 4182 4183 4184 4185 4186
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203
/**
 *	ata_dumb_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
 *	Prepare ATA taskfile for submission.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_dumb_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg_dumb(qc);
}

4204 4205
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4206 4207 4208 4209 4210 4211 4212 4213 4214 4215
/**
 *	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
4216
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4217 4218
 */

L
Linus Torvalds 已提交
4219 4220 4221 4222
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4223
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4224
	qc->n_elem = 1;
4225
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4226
	qc->buf_virt = buf;
4227
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4228

4229
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4230 4231
}

J
Jeff Garzik 已提交
4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242
/**
 *	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
4243
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4244 4245
 */

L
Linus Torvalds 已提交
4246 4247 4248 4249
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4250
	qc->__sg = sg;
L
Linus Torvalds 已提交
4251
	qc->n_elem = n_elem;
4252
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4253 4254 4255
}

/**
J
Jeff Garzik 已提交
4256 4257 4258 4259
 *	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
4260 4261
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4262
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4263 4264
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4265
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4266 4267 4268 4269 4270 4271
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4272
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4273
	dma_addr_t dma_address;
4274
	int trim_sg = 0;
L
Linus Torvalds 已提交
4275

4276 4277 4278 4279 4280 4281
	/* 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;

4282
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293

		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;
4294 4295
		if (sg->length == 0)
			trim_sg = 1;
4296 4297 4298 4299 4300

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

4301 4302
	if (trim_sg) {
		qc->n_elem--;
4303 4304 4305
		goto skip_map;
	}

4306
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4307
				     sg->length, dir);
4308 4309 4310
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4311
		return -1;
4312
	}
L
Linus Torvalds 已提交
4313 4314

	sg_dma_address(sg) = dma_address;
4315
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4316

4317
skip_map:
L
Linus Torvalds 已提交
4318 4319 4320 4321 4322 4323 4324
	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
4325 4326 4327 4328
 *	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
4329 4330
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4331
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4332 4333
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4334
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4335 4336 4337 4338 4339 4340
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4341 4342
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4343
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4344

T
Tejun Heo 已提交
4345
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4346
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4347

4348 4349 4350 4351 4352 4353 4354
	/* 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;

4355
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369

		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);
4370
			kunmap_atomic(addr, KM_IRQ0);
4371 4372 4373 4374 4375 4376
		}

		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;
4377 4378
		if (lsg->length == 0)
			trim_sg = 1;
4379 4380 4381 4382 4383

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

4384 4385 4386 4387 4388 4389 4390 4391 4392
	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
4393
	dir = qc->dma_dir;
4394
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4395 4396 4397
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4398
		return -1;
4399
	}
L
Linus Torvalds 已提交
4400 4401 4402

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

4403
skip_map:
L
Linus Torvalds 已提交
4404 4405 4406 4407 4408
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4409
/**
4410
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4411 4412 4413 4414 4415 4416 4417 4418
 *	@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
4419
 *	Inherited from caller.
E
Edward Falk 已提交
4420
 */
L
Linus Torvalds 已提交
4421 4422 4423 4424 4425 4426 4427 4428 4429 4430
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
4431
/**
T
Tejun Heo 已提交
4432
 *	ata_data_xfer - Transfer data by PIO
4433
 *	@adev: device to target
A
Albert Lee 已提交
4434 4435
 *	@buf: data buffer
 *	@buflen: buffer length
4436
 *	@write_data: read/write
A
Albert Lee 已提交
4437 4438 4439 4440 4441 4442
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4443 4444
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4445
{
4446
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4447
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4448

A
Albert Lee 已提交
4449
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4450
	if (write_data)
T
Tejun Heo 已提交
4451
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4452
	else
T
Tejun Heo 已提交
4453
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4454 4455 4456 4457 4458 4459 4460 4461

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
		u16 align_buf[1] = { 0 };
		unsigned char *trailing_buf = buf + buflen - 1;

		if (write_data) {
			memcpy(align_buf, trailing_buf, 1);
T
Tejun Heo 已提交
4462
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4463
		} else {
T
Tejun Heo 已提交
4464
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4465 4466 4467
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4468 4469
}

4470
/**
T
Tejun Heo 已提交
4471
 *	ata_data_xfer_noirq - Transfer data by PIO
4472 4473 4474 4475 4476
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4477
 *	Transfer data from/to the device data register by PIO. Do the
4478 4479 4480 4481 4482
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4483 4484
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4485 4486 4487
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4488
	ata_data_xfer(adev, buf, buflen, write_data);
4489 4490 4491 4492
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4493
/**
4494
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4495 4496
 *	@qc: Command on going
 *
4497
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4498 4499 4500 4501 4502
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4503 4504 4505
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4506
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4507 4508 4509 4510 4511
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4512
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4513
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4514 4515

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4516
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4517 4518 4519 4520 4521 4522 4523

	/* 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");

4524 4525 4526
	if (PageHighMem(page)) {
		unsigned long flags;

4527
		/* FIXME: use a bounce buffer */
4528 4529
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4530

4531
		/* do the actual data transfer */
4532
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4533

4534 4535 4536 4537
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4538
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4539
	}
L
Linus Torvalds 已提交
4540

4541 4542
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4543

T
Tejun Heo 已提交
4544
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4545 4546 4547 4548 4549
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4550
/**
4551
 *	ata_pio_sectors - Transfer one or many sectors.
4552 4553
 *	@qc: Command on going
 *
4554
 *	Transfer one or many sectors of data from/to the
4555 4556 4557 4558 4559
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4560

4561 4562 4563 4564 4565 4566
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
4567
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4568

4569
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4570
			    qc->dev->multi_count);
4571 4572 4573 4574 4575 4576
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
/**
 *	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");
4593
	WARN_ON(qc->dev->cdb_len < 12);
4594

4595
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610
	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
4611 4612
}

A
Albert Lee 已提交
4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624
/**
 *	__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
4625 4626 4627
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4628
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4629 4630 4631 4632 4633
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4634
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4635
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4636 4637

next_sg:
4638
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4639
		/*
4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650
		 * 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 */
4651 4652
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4653 4654

		for (i = 0; i < words; i++)
4655
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4656

A
Albert Lee 已提交
4657
		ap->hsm_task_state = HSM_ST_LAST;
4658 4659 4660
		return;
	}

4661
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4662 4663 4664 4665 4666 4667 4668 4669

	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;

4670
	/* don't overrun current sg */
4671
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4672 4673 4674 4675

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

4676 4677
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4678 4679 4680
	if (PageHighMem(page)) {
		unsigned long flags;

4681
		/* FIXME: use bounce buffer */
4682 4683
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4684

4685
		/* do the actual data transfer */
4686
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4687

4688 4689 4690 4691
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4692
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4693
	}
L
Linus Torvalds 已提交
4694 4695 4696 4697 4698

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

4699
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4700 4701 4702 4703
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4704
	if (bytes)
L
Linus Torvalds 已提交
4705 4706 4707
		goto next_sg;
}

A
Albert Lee 已提交
4708 4709 4710 4711 4712 4713 4714 4715 4716 4717
/**
 *	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
4718 4719 4720 4721 4722 4723 4724
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;

4725 4726 4727 4728 4729 4730 4731 4732 4733 4734
	/* 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
4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745
	bytes = (bc_hi << 8) | bc_lo;

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

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

T
Tejun Heo 已提交
4746
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4747

L
Linus Torvalds 已提交
4748 4749 4750 4751 4752
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4753
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4754
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4755
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4756 4757 4758
}

/**
4759 4760 4761
 *	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
4762
 *
4763 4764
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4765
 */
4766 4767

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4768
{
4769 4770
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4771

4772 4773 4774 4775
	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
4776

4777 4778 4779
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4780 4781
	}

4782 4783
	return 0;
}
L
Linus Torvalds 已提交
4784

T
Tejun Heo 已提交
4785 4786 4787 4788 4789 4790 4791 4792
/**
 *	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
4793
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4794 4795 4796 4797 4798 4799 4800 4801 4802
 *	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) {
4803
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4804

J
Jeff Garzik 已提交
4805 4806
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4807 4808 4809 4810
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4811
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4812 4813 4814 4815 4816
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4817
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4818 4819 4820 4821 4822 4823 4824 4825
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4826
			spin_lock_irqsave(ap->lock, flags);
4827
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4828
			ata_qc_complete(qc);
4829
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4830 4831 4832 4833 4834
		} else
			ata_qc_complete(qc);
	}
}

4835 4836 4837 4838 4839 4840 4841 4842 4843 4844
/**
 *	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.
 */
4845 4846
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4847
{
4848 4849 4850
	unsigned long flags = 0;
	int poll_next;

4851 4852
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4853 4854 4855 4856
	/* 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).
	 */
4857
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4858

4859
fsm_start:
4860
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4861
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4862

4863 4864
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4865 4866 4867 4868 4869 4870 4871 4872
		/* 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);

4873
		/* check device status */
4874 4875 4876 4877 4878 4879 4880 4881 4882
		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
4883
			ap->hsm_task_state = HSM_ST_ERR;
4884
			goto fsm_start;
L
Linus Torvalds 已提交
4885 4886
		}

4887 4888
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4889 4890 4891
		 * 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.
4892 4893
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4894 4895
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4896
			qc->err_mask |= AC_ERR_HSM;
4897 4898
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4899
		}
L
Linus Torvalds 已提交
4900

4901 4902 4903 4904 4905 4906
		/* 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)
4907
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4908

4909 4910 4911 4912
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4913

4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925
			/* 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)
4926
			spin_unlock_irqrestore(ap->lock, flags);
4927 4928 4929 4930

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4931
		break;
4932

4933 4934 4935 4936 4937
	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) {
4938 4939 4940
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4941 4942 4943
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4944

4945 4946
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4947 4948 4949
			 * 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.
4950 4951
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4952 4953 4954
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4955
				qc->err_mask |= AC_ERR_HSM;
4956 4957
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4958
			}
L
Linus Torvalds 已提交
4959

4960
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4961

4962 4963 4964
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4965

4966 4967 4968 4969
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4970 4971 4972 4973
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4974 4975 4976 4977 4978 4979
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4980

4981 4982 4983
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4984

4985 4986 4987 4988 4989 4990 4991 4992 4993
			/* 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.
4994 4995 4996 4997
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
4998 4999 5000 5001 5002 5003 5004

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

5005 5006 5007
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5008 5009 5010 5011 5012 5013
				/* 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;
5014 5015
			}

5016 5017 5018 5019 5020 5021
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
5022
				status = ata_wait_idle(ap);
5023 5024 5025 5026 5027
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
5028
		poll_next = 1;
L
Linus Torvalds 已提交
5029 5030
		break;

A
Albert Lee 已提交
5031
	case HSM_ST_LAST:
5032 5033
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5034 5035 5036 5037 5038
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5039
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5040
			ap->print_id, qc->dev->devno, status);
5041

5042 5043
		WARN_ON(qc->err_mask);

5044
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5045

5046
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5047
		ata_hsm_qc_complete(qc, in_wq);
5048 5049

		poll_next = 0;
L
Linus Torvalds 已提交
5050 5051
		break;

A
Albert Lee 已提交
5052
	case HSM_ST_ERR:
5053 5054 5055 5056 5057 5058
		/* 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;
5059

5060
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5061
		ata_hsm_qc_complete(qc, in_wq);
5062 5063

		poll_next = 0;
5064 5065
		break;
	default:
5066
		poll_next = 0;
5067
		BUG();
L
Linus Torvalds 已提交
5068 5069
	}

5070
	return poll_next;
L
Linus Torvalds 已提交
5071 5072
}

5073
static void ata_pio_task(struct work_struct *work)
5074
{
5075 5076 5077
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5078
	u8 status;
5079
	int poll_next;
5080

J
Jeff Garzik 已提交
5081
fsm_start:
5082
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5083

5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095
	/*
	 * 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) {
5096
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5097 5098
			return;
		}
5099 5100
	}

5101 5102
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5103

5104 5105 5106 5107
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5108
		goto fsm_start;
5109 5110
}

L
Linus Torvalds 已提交
5111 5112 5113 5114 5115 5116
/**
 *	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
5117
 *	None.
L
Linus Torvalds 已提交
5118 5119 5120 5121 5122 5123 5124
 */

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

5125
	/* no command while frozen */
5126
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5127 5128
		return NULL;

5129 5130
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5131
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5132
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146
			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
5147
 *	None.
L
Linus Torvalds 已提交
5148 5149
 */

T
Tejun Heo 已提交
5150
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5151
{
T
Tejun Heo 已提交
5152
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
5153 5154 5155 5156 5157 5158 5159 5160
	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
5161
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174
	}

	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
5175
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5176 5177 5178
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5179 5180 5181
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5182
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5183

5184 5185 5186 5187
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5188
		clear_bit(tag, &ap->qc_allocated);
5189
	}
L
Linus Torvalds 已提交
5190 5191
}

5192
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5193
{
5194 5195
	struct ata_port *ap = qc->ap;

5196 5197
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5198 5199 5200 5201

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

5202
	/* command should be marked inactive atomically with qc completion */
5203 5204 5205 5206
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
5207

5208 5209 5210 5211 5212
	/* 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;
5213
	ap->qc_active &= ~(1 << qc->tag);
5214

L
Linus Torvalds 已提交
5215
	/* call completion callback */
5216
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5217 5218
}

5219 5220 5221 5222 5223
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5224
	ap->ops->tf_read(ap, &qc->result_tf);
5225 5226
}

5227 5228 5229 5230 5231 5232 5233 5234 5235
/**
 *	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
5236
 *	spin_lock_irqsave(host lock)
5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255
 */
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) {
5256
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5257 5258 5259 5260 5261 5262 5263

		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 */
5264
				fill_result_tf(qc);
5265 5266 5267 5268 5269 5270 5271
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5272
			fill_result_tf(qc);
5273 5274 5275 5276 5277 5278 5279 5280

		__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)
5281
			fill_result_tf(qc);
5282 5283 5284 5285 5286

		__ata_qc_complete(qc);
	}
}

5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298
/**
 *	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
5299
 *	spin_lock_irqsave(host lock)
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
 *
 *	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
5336 5337 5338 5339 5340
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5341
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369
	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
5370
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5371
 */
5372
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5373 5374 5375
{
	struct ata_port *ap = qc->ap;

5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389
	/* 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;
	}

5390
	qc->flags |= ATA_QCFLAG_ACTIVE;
5391
	ap->qc_active |= 1 << qc->tag;
5392

L
Linus Torvalds 已提交
5393 5394 5395
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5396
				goto sg_err;
L
Linus Torvalds 已提交
5397 5398
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5399
				goto sg_err;
L
Linus Torvalds 已提交
5400 5401 5402 5403 5404 5405 5406
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5407 5408 5409 5410
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5411

5412 5413
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5414 5415 5416
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427
}

/**
 *	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
5428 5429
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5430
 *	LOCKING:
J
Jeff Garzik 已提交
5431
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5432 5433
 *
 *	RETURNS:
5434
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5435 5436
 */

5437
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5438 5439 5440
{
	struct ata_port *ap = qc->ap;

5441 5442 5443 5444 5445 5446
	/* 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:
5447
		case ATA_PROT_NODATA:
5448 5449 5450 5451 5452 5453
		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)
5454
				/* see ata_dma_blacklisted() */
5455 5456 5457 5458 5459 5460 5461
				BUG();
			break;
		default:
			break;
		}
	}

5462
	/* select the device */
L
Linus Torvalds 已提交
5463 5464
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5465
	/* start the command */
L
Linus Torvalds 已提交
5466 5467
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5468 5469 5470
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5471
		ata_tf_to_host(ap, &qc->tf);
5472 5473 5474
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5475
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5476

L
Linus Torvalds 已提交
5477 5478 5479
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5480
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5481

L
Linus Torvalds 已提交
5482 5483 5484
		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 */
5485
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5486 5487
		break;

5488 5489 5490
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5491

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

5494 5495 5496
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5497
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5498 5499

			/* always send first data block using
5500
			 * the ata_pio_task() codepath.
5501
			 */
5502
		} else {
5503 5504 5505 5506
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5507
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5508 5509 5510 5511

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5512 5513
		}

L
Linus Torvalds 已提交
5514 5515 5516 5517
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5518 5519 5520
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5521
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5522

5523 5524 5525 5526 5527
		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))
5528
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5529 5530 5531
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5532
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5533

L
Linus Torvalds 已提交
5534 5535
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5536 5537 5538 5539
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5540
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5541 5542 5543 5544
		break;

	default:
		WARN_ON(1);
5545
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560
	}

	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
5561
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5562 5563 5564 5565 5566 5567 5568 5569
 *
 *	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)
{
5570
	struct ata_eh_info *ehi = &ap->eh_info;
5571
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5572

5573
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5574
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5575

5576 5577 5578
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5579 5580 5581
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5582

5583 5584 5585 5586 5587
		/* 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
5588 5589
			goto idle_irq;
		break;
5590 5591 5592 5593 5594
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
5595 5596
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5597 5598 5599 5600 5601 5602 5603

			/* 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);
5604 5605 5606 5607 5608 5609

			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;
			}
5610 5611 5612 5613
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5614 5615 5616 5617
	default:
		goto idle_irq;
	}

5618 5619 5620 5621
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5622

5623 5624 5625 5626
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5627

5628 5629
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5630

5631
	ata_hsm_move(ap, qc, status, 0);
5632 5633 5634 5635 5636

	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
5637 5638 5639 5640 5641 5642 5643
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5644
		ap->ops->irq_ack(ap, 0); /* debug trap */
5645
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5646
		return 1;
L
Linus Torvalds 已提交
5647 5648 5649 5650 5651 5652 5653
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5654
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5655
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5656
 *
J
Jeff Garzik 已提交
5657 5658 5659
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5660
 *	LOCKING:
J
Jeff Garzik 已提交
5661
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5662 5663
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5664
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5665 5666
 */

5667
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5668
{
J
Jeff Garzik 已提交
5669
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5670 5671 5672 5673 5674
	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
5675
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5676

J
Jeff Garzik 已提交
5677
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5678 5679
		struct ata_port *ap;

J
Jeff Garzik 已提交
5680
		ap = host->ports[i];
5681
		if (ap &&
J
Jeff Garzik 已提交
5682
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5683 5684 5685
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5686
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5687
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5688 5689 5690 5691
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5692
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5693 5694 5695 5696

	return IRQ_RETVAL(handled);
}

5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710
/**
 *	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)
{
5711
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833
}

/**
 *	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
5834

5835
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5836
{
5837
	unsigned int err_mask;
J
Jens Axboe 已提交
5838 5839 5840 5841 5842
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5843
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5844 5845 5846 5847
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5848 5849 5850 5851 5852 5853 5854
	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
5855 5856
}

5857
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5858 5859 5860
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5861 5862 5863 5864
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5865 5866
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905

		/* 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
5906 5907
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5908 5909
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5910
 *	Suspend @host.  Actual operation is performed by EH.  This
5911 5912 5913 5914 5915 5916 5917 5918 5919
 *	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
5920
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5921
{
5922
	int rc;
5923

J
Jeff Garzik 已提交
5924
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5925 5926
	if (rc == 0)
		host->dev->power.power_state = mesg;
5927 5928 5929 5930
	return rc;
}

/**
J
Jeff Garzik 已提交
5931 5932
 *	ata_host_resume - resume host
 *	@host: host to resume
5933
 *
J
Jeff Garzik 已提交
5934
 *	Resume @host.  Actual operation is performed by EH.  This
5935 5936 5937 5938 5939 5940
 *	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
5941
void ata_host_resume(struct ata_host *host)
5942
{
J
Jeff Garzik 已提交
5943 5944 5945
	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;
5946
}
5947
#endif
5948

5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960
/**
 *	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.
 */
5961
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5962
{
5963
	struct device *dev = ap->dev;
5964
	int rc;
L
Linus Torvalds 已提交
5965

5966 5967
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5968 5969 5970
	if (!ap->prd)
		return -ENOMEM;

5971
	rc = ata_pad_alloc(ap, dev);
5972
	if (rc)
5973
		return rc;
L
Linus Torvalds 已提交
5974

5975 5976
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5977 5978 5979
	return 0;
}

5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991
/**
 *	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;
5992 5993
	unsigned long flags;

5994 5995 5996
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;

5997 5998
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5999
	 * host lock.
6000
	 */
6001
	spin_lock_irqsave(ap->lock, flags);
6002
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6003
	spin_unlock_irqrestore(ap->lock, flags);
6004

6005 6006
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6007 6008 6009 6010 6011
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
6012
/**
6013 6014
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6015
 *
6016 6017 6018 6019
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6020
 *
L
Linus Torvalds 已提交
6021
 *	LOCKING:
6022
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6023
 */
6024
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6025
{
6026
	struct ata_port *ap;
L
Linus Torvalds 已提交
6027 6028
	unsigned int i;

6029 6030 6031 6032 6033 6034
	DPRINTK("ENTER\n");

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

6035
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6036
	ap->lock = &host->lock;
6037
	ap->flags = ATA_FLAG_DISABLED;
6038
	ap->print_id = -1;
L
Linus Torvalds 已提交
6039
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6040
	ap->host = host;
6041 6042
	ap->dev = host->dev;

6043
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
6044 6045
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
6046 6047 6048 6049 6050 6051

#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
6052
#else
6053
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6054
#endif
L
Linus Torvalds 已提交
6055

6056 6057 6058
	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);
6059
	INIT_LIST_HEAD(&ap->eh_done_q);
6060
	init_waitqueue_head(&ap->eh_wait_q);
L
Linus Torvalds 已提交
6061

6062 6063
	ap->cbl = ATA_CBL_NONE;

6064 6065
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
6066
		dev->ap = ap;
6067
		dev->devno = i;
6068
		ata_dev_init(dev);
6069
	}
L
Linus Torvalds 已提交
6070 6071 6072 6073 6074 6075 6076 6077

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

6078 6079 6080 6081 6082 6083 6084 6085
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

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

6086 6087 6088 6089
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6090 6091 6092
			ap->ops->port_stop(ap);
	}

6093
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6094
		host->ops->host_stop(host);
6095

6096 6097 6098
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6099 6100 6101 6102
		if (!ap)
			continue;

		if (ap->scsi_host)
6103 6104
			scsi_host_put(ap->scsi_host);

6105
		kfree(ap);
6106 6107 6108
		host->ports[i] = NULL;
	}

6109
	dev_set_drvdata(gendev, NULL);
6110 6111
}

6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

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

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

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

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

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

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

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

	devres_remove_group(dev, NULL);
	return host;

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

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 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

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

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

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

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

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

	return host;
}

6226 6227 6228 6229 6230 6231 6232
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
6233 6234
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
	int i, rc;

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

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

6252 6253 6254
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
				ata_port_printk(ap, KERN_ERR, "failed to "
						"start port (errno=%d)\n", rc);
				goto err_out;
			}
		}

		ata_eh_freeze_port(ap);
	}

	host->flags |= ATA_HOST_STARTED;
	return 0;

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

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

6280
/**
J
Jeff Garzik 已提交
6281 6282 6283 6284 6285
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6286 6287 6288 6289 6290
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6291
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6292 6293
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6294
{
J
Jeff Garzik 已提交
6295 6296 6297 6298
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6299 6300
}

6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

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

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

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

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

6344 6345 6346
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360
	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		int irq_line;
		u32 scontrol;
		unsigned long xfer_mask;

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

		/* init sata_spd_limit to the current value */
		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
			int spd = (scontrol >> 4) & 0xf;
6361 6362
			if (spd)
				ap->hw_sata_spd_limit &= (1 << spd) - 1;
6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377
		}
		ap->sata_spd_limit = ap->hw_sata_spd_limit;

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

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

		/* print per-port info to dmesg */
		if (!ata_port_is_dummy(ap))
			ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%p "
					"ctl 0x%p bmdma 0x%p irq %d\n",
6378
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407
					ata_mode_string(xfer_mask),
					ap->ioaddr.cmd_addr,
					ap->ioaddr.ctl_addr,
					ap->ioaddr.bmdma_addr,
					irq_line);
		else
			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
	}

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

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

			ata_port_probe(ap);

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

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

6408
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442
			ap->pflags |= ATA_PFLAG_LOADING;
			ata_port_schedule_eh(ap);

			spin_unlock_irqrestore(ap->lock, flags);

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

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

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

		ata_scsi_scan_host(ap);
	}

	return 0;
}

6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
	int rc;

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

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

T
Tejun Heo 已提交
6477 6478 6479
	/* Used to print device info at probe */
	host->irq = irq;

6480 6481 6482 6483 6484 6485 6486 6487
	rc = ata_host_register(host, sht);
	/* if failed, just free the IRQ and leave ports alone */
	if (rc)
		devm_free_irq(host->dev, irq, host);

	return rc;
}

6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504
/**
 *	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)
6505
		goto skip_eh;
6506 6507

	/* tell EH we're leaving & flush EH */
6508
	spin_lock_irqsave(ap->lock, flags);
6509
	ap->pflags |= ATA_PFLAG_UNLOADING;
6510
	spin_unlock_irqrestore(ap->lock, flags);
6511 6512 6513 6514 6515 6516

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6517
	spin_lock_irqsave(ap->lock, flags);
6518 6519 6520 6521

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

6522
	spin_unlock_irqrestore(ap->lock, flags);
6523 6524 6525 6526 6527

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6528
	spin_lock_irqsave(ap->lock, flags);
6529
	ata_port_freeze(ap);	/* won't be thawed */
6530
	spin_unlock_irqrestore(ap->lock, flags);
6531 6532

	ata_port_wait_eh(ap);
6533
	cancel_rearming_delayed_work(&ap->hotplug_task);
6534

6535
 skip_eh:
6536
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6537
	scsi_remove_host(ap->scsi_host);
6538 6539
}

T
Tejun Heo 已提交
6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

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

L
Linus Torvalds 已提交
6557 6558 6559
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6560 6561 6562 6563 6564 6565 6566
 *
 *	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
6567
 */
E
Edward Falk 已提交
6568

L
Linus Torvalds 已提交
6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582
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
6583

6584 6585
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6586 6587 6588 6589
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6590 6591 6592
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
6593 6594 6595 6596
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6597
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6598 6599
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6600
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6601

T
Tejun Heo 已提交
6602
	ata_host_detach(host);
L
Linus Torvalds 已提交
6603 6604 6605
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6606
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637
{
	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
6638

6639
#ifdef CONFIG_PM
6640
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6641 6642
{
	pci_save_state(pdev);
6643
	pci_disable_device(pdev);
6644

6645
	if (mesg.event == PM_EVENT_SUSPEND)
6646
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6647 6648
}

6649
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6650
{
6651 6652
	int rc;

J
Jens Axboe 已提交
6653 6654
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6655

T
Tejun Heo 已提交
6656
	rc = pcim_enable_device(pdev);
6657 6658 6659 6660 6661 6662
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev,
			   "failed to enable device after resume (%d)\n", rc);
		return rc;
	}

J
Jens Axboe 已提交
6663
	pci_set_master(pdev);
6664
	return 0;
6665 6666
}

6667
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6668
{
J
Jeff Garzik 已提交
6669
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6670 6671
	int rc = 0;

J
Jeff Garzik 已提交
6672
	rc = ata_host_suspend(host, mesg);
6673 6674 6675
	if (rc)
		return rc;

6676
	ata_pci_device_do_suspend(pdev, mesg);
6677 6678 6679 6680 6681 6682

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6683
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6684
	int rc;
6685

6686 6687 6688 6689
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6690
}
6691 6692
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6693 6694 6695 6696 6697
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6698
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6699 6700 6701 6702
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6703 6704 6705 6706 6707 6708
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6709 6710 6711 6712 6713 6714 6715
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6716
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6717 6718
}

6719
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6720 6721
module_exit(ata_exit);

6722
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6723
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742

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;
}

6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788
/**
 *	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
6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821
/*
 * 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,
};

6822 6823 6824 6825
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6826 6827 6828 6829 6830 6831 6832
/*
 * 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.
 */

6833 6834 6835
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
6836
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6837
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
6838 6839
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6840
EXPORT_SYMBOL_GPL(ata_host_init);
6841
EXPORT_SYMBOL_GPL(ata_host_alloc);
6842
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6843
EXPORT_SYMBOL_GPL(ata_host_start);
6844
EXPORT_SYMBOL_GPL(ata_host_register);
6845
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6846
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6847 6848
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6849
EXPORT_SYMBOL_GPL(ata_hsm_move);
6850
EXPORT_SYMBOL_GPL(ata_qc_complete);
6851
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6852 6853 6854 6855 6856
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);
6857
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6858 6859 6860 6861 6862 6863
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);
6864
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
6865
EXPORT_SYMBOL_GPL(ata_interrupt);
6866
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
6867 6868
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6869
EXPORT_SYMBOL_GPL(ata_qc_prep);
6870
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
6871
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6872 6873 6874 6875 6876
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);
6877 6878 6879 6880 6881
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
6882
EXPORT_SYMBOL_GPL(ata_port_probe);
6883
EXPORT_SYMBOL_GPL(ata_dev_disable);
6884
EXPORT_SYMBOL_GPL(sata_set_spd);
6885 6886
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6887 6888 6889
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6890
EXPORT_SYMBOL_GPL(ata_std_prereset);
6891
EXPORT_SYMBOL_GPL(ata_std_softreset);
6892
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6893 6894
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6895 6896
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6897
EXPORT_SYMBOL_GPL(ata_port_disable);
6898
EXPORT_SYMBOL_GPL(ata_ratelimit);
6899
EXPORT_SYMBOL_GPL(ata_wait_register);
6900
EXPORT_SYMBOL_GPL(ata_busy_sleep);
6901
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
6902
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6903 6904 6905
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6906
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6907
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6908
EXPORT_SYMBOL_GPL(ata_host_intr);
6909 6910 6911 6912 6913 6914
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);
6915
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6916 6917
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6918
#endif /* CONFIG_PM */
6919 6920
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6921
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
L
Linus Torvalds 已提交
6922 6923
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6924
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6925 6926 6927
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6928 6929
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6930
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
T
Tejun Heo 已提交
6931
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
6932
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
L
Linus Torvalds 已提交
6933 6934
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6935
#ifdef CONFIG_PM
6936 6937
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6938 6939
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6940
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6941 6942
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6943
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6944

6945
EXPORT_SYMBOL_GPL(ata_eng_timeout);
6946 6947
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6948 6949 6950
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6951 6952
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6953
EXPORT_SYMBOL_GPL(ata_do_eh);
6954 6955 6956 6957
EXPORT_SYMBOL_GPL(ata_irq_on);
EXPORT_SYMBOL_GPL(ata_dummy_irq_on);
EXPORT_SYMBOL_GPL(ata_irq_ack);
EXPORT_SYMBOL_GPL(ata_dummy_irq_ack);
A
Akira Iguchi 已提交
6958
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6959 6960 6961 6962 6963

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