libata-core.c 171.1 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
 *	@pmp: Port multiplier port
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 *	@is_cmd: This FIS is for command
 *	@fis: Buffer into which data will output
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 *
 *	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 pmp, int is_cmd, u8 *fis)
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{
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	fis[0] = 0x27;			/* Register - Host to Device FIS */
	fis[1] = pmp & 0xf;		/* Port multiplier number*/
	if (is_cmd)
		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */

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	fis[2] = tf->command;
	fis[3] = tf->feature;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return block;
}

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

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

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

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

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

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

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

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

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

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

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

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

		tf->nsect = n_block & 0xff;

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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void ata_dev_disable(struct ata_device *dev)
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{
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	if (ata_dev_enabled(dev)) {
		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)
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 *	@r_err: Value of error register on completion
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 *
 *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
 *	an ATA/ATAPI-defined set of values is placed in the ATA
 *	shadow registers, indicating the results of device detection
 *	and diagnostics.
 *
 *	Select the ATA device, and read the values from the ATA shadow
 *	registers.  Then parse according to the Error register value,
 *	and the spec-defined values examined by ata_dev_classify().
 *
 *	LOCKING:
 *	caller.
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 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
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 */

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

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

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

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

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

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

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

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

		ofs++;
		len -= 2;
	}
}

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/**
791
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
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 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an odd number.
 *
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 *	This function is identical to ata_id_string except that it
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 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
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void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
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{
	unsigned char *p;

	WARN_ON(!(len & 1));

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	ata_id_string(id, s, ofs, len - 1);
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	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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static u64 ata_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;
}

1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
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];
	}
}

1034 1035 1036
/**
 *	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
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 *	@id: IDENTIFY DEVICE page to dump
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 *
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 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
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 *
 *	LOCKING:
 *	caller.
 */

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static inline void ata_dump_id(const u16 *id)
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1171 1172 1173 1174 1175 1176
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1177 1178 1179 1180 1181
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1182 1183 1184 1185 1186
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1187 1188 1189 1190 1191
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1192 1193
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1194 1195
		id[88],
		id[93]);
L
Linus Torvalds 已提交
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 1225 1226
/**
 *	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.
		 */
1227
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1228 1229 1230 1231
		if (mode < 5)	/* Valid PIO range */
                	pio_mask = (2 << mode) - 1;
		else
			pio_mask = 1;
1232 1233 1234 1235 1236 1237 1238 1239 1240 1241

		/* 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;
1242

1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
	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);
	}

1260 1261 1262
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1263 1264 1265 1266

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
Tejun Heo 已提交
1267 1268 1269
/**
 *	ata_port_queue_task - Queue port_task
 *	@ap: The ata_port to queue port_task for
1270
 *	@fn: workqueue function to be scheduled
1271
 *	@data: data for @fn to use
1272
 *	@delay: delay time for workqueue function
T
Tejun Heo 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
 *
 *	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.
 */
1286
void ata_port_queue_task(struct ata_port *ap, work_func_t fn, void *data,
T
Tejun Heo 已提交
1287 1288
			 unsigned long delay)
{
1289 1290
	PREPARE_DELAYED_WORK(&ap->port_task, fn);
	ap->port_task_data = data;
T
Tejun Heo 已提交
1291

1292 1293
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
T
Tejun Heo 已提交
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309
}

/**
 *	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");

1310
	cancel_rearming_delayed_work(&ap->port_task);
T
Tejun Heo 已提交
1311

1312 1313
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
Tejun Heo 已提交
1314 1315
}

1316
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1317
{
1318
	struct completion *waiting = qc->private_data;
1319 1320 1321 1322 1323

	complete(waiting);
}

/**
1324
 *	ata_exec_internal_sg - execute libata internal command
1325 1326
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1327
 *	@cdb: CDB for packet command
1328
 *	@dma_dir: Data tranfer direction of the command
1329 1330
 *	@sg: sg list for the data buffer of the command
 *	@n_elem: Number of sg entries
1331 1332 1333 1334 1335 1336 1337 1338 1339
 *
 *	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.
1340 1341 1342
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1343
 */
1344 1345 1346 1347
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)
1348
{
T
Tejun Heo 已提交
1349
	struct ata_port *ap = dev->ap;
1350 1351
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1352
	unsigned int tag, preempted_tag;
1353
	u32 preempted_sactive, preempted_qc_active;
1354
	DECLARE_COMPLETION_ONSTACK(wait);
1355
	unsigned long flags;
1356
	unsigned int err_mask;
1357
	int rc;
1358

1359
	spin_lock_irqsave(ap->lock, flags);
1360

1361
	/* no internal command while frozen */
1362
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1363
		spin_unlock_irqrestore(ap->lock, flags);
1364 1365 1366
		return AC_ERR_SYSTEM;
	}

1367
	/* initialize internal qc */
1368

1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
	/* 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;

1379
	if (test_and_set_bit(tag, &ap->qc_allocated))
1380
		BUG();
1381
	qc = __ata_qc_from_tag(ap, tag);
1382 1383 1384 1385 1386 1387 1388 1389

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

	preempted_tag = ap->active_tag;
1390 1391
	preempted_sactive = ap->sactive;
	preempted_qc_active = ap->qc_active;
1392
	ap->active_tag = ATA_TAG_POISON;
1393 1394
	ap->sactive = 0;
	ap->qc_active = 0;
1395 1396

	/* prepare & issue qc */
1397
	qc->tf = *tf;
1398 1399
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1400
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1401 1402
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1403 1404 1405 1406 1407 1408
		unsigned int i, buflen = 0;

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

		ata_sg_init(qc, sg, n_elem);
1409
		qc->nbytes = buflen;
1410 1411
	}

1412
	qc->private_data = &wait;
1413 1414
	qc->complete_fn = ata_qc_complete_internal;

1415
	ata_qc_issue(qc);
1416

1417
	spin_unlock_irqrestore(ap->lock, flags);
1418

A
Andrew Morton 已提交
1419
	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
1420 1421

	ata_port_flush_task(ap);
1422

1423
	if (!rc) {
1424
		spin_lock_irqsave(ap->lock, flags);
1425 1426 1427

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1428 1429
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1430
		 */
1431
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1432 1433 1434 1435 1436 1437
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1438

1439 1440
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1441
					"qc timeout (cmd 0x%x)\n", command);
1442 1443
		}

1444
		spin_unlock_irqrestore(ap->lock, flags);
1445 1446
	}

1447 1448 1449 1450
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1451 1452 1453 1454 1455 1456 1457 1458 1459 1460
	/* 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;
1461 1462
	}

1463
	/* finish up */
1464
	spin_lock_irqsave(ap->lock, flags);
1465

1466
	*tf = qc->result_tf;
1467 1468 1469
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1470
	ap->active_tag = preempted_tag;
1471 1472
	ap->sactive = preempted_sactive;
	ap->qc_active = preempted_qc_active;
1473

1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
	/* 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.
	 */
1485
	if (ap->flags & ATA_FLAG_DISABLED) {
1486 1487 1488 1489
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1490
	spin_unlock_irqrestore(ap->lock, flags);
1491

1492
	return err_mask;
1493 1494
}

1495
/**
1496
 *	ata_exec_internal - execute libata internal command
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
 *	@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)
{
1517 1518
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1519

1520 1521 1522 1523 1524 1525
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1526

1527
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem);
1528 1529
}

1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
/**
 *	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
1543
 */
1544
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1545 1546 1547 1548 1549 1550 1551 1552 1553
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1554
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
1555 1556
}

1557 1558 1559 1560 1561 1562 1563
/**
 *	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
1564

1565 1566
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1567 1568 1569
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
	if (adev->ap->flags & ATA_FLAG_NO_IORDY)
1570
		return 0;
A
Alan Cox 已提交
1571 1572 1573 1574 1575
	/* 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))
1576
		return 1;
A
Alan Cox 已提交
1577 1578
	return 0;
}
1579

A
Alan Cox 已提交
1580 1581 1582 1583 1584 1585 1586
/**
 *	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
1587

A
Alan Cox 已提交
1588 1589
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1590 1591
	/* 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
1592
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1593 1594 1595 1596
		/* 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
1597 1598
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1599 1600
		}
	}
A
Alan Cox 已提交
1601
	return 3 << ATA_SHIFT_PIO;
1602 1603
}

L
Linus Torvalds 已提交
1604
/**
1605 1606 1607
 *	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)
1608
 *	@flags: ATA_READID_* flags
1609
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1610
 *
1611 1612
 *	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
1613 1614
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1615 1616
 *
 *	LOCKING:
1617 1618 1619 1620
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1621
 */
1622
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1623
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1624
{
T
Tejun Heo 已提交
1625
	struct ata_port *ap = dev->ap;
1626
	unsigned int class = *p_class;
1627
	struct ata_taskfile tf;
1628 1629
	unsigned int err_mask = 0;
	const char *reason;
1630
	int may_fallback = 1, tried_spinup = 0;
1631
	int rc;
L
Linus Torvalds 已提交
1632

1633
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1634
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1635

1636 1637
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1638
	ata_tf_init(dev, &tf);
1639

1640 1641
	switch (class) {
	case ATA_DEV_ATA:
1642
		tf.command = ATA_CMD_ID_ATA;
1643 1644
		break;
	case ATA_DEV_ATAPI:
1645
		tf.command = ATA_CMD_ID_ATAPI;
1646 1647 1648 1649 1650
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1651 1652
	}

1653
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663

	/* 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
1664

T
Tejun Heo 已提交
1665
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1666
				     id, sizeof(id[0]) * ATA_ID_WORDS);
1667
	if (err_mask) {
1668
		if (err_mask & AC_ERR_NODEV_HINT) {
1669
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1670
				ap->print_id, dev->devno);
1671 1672 1673
			return -ENOENT;
		}

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
		/* 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;
		}

1689 1690
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1691 1692 1693
		goto err_out;
	}

1694 1695 1696 1697 1698
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1699
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1700

1701
	/* sanity check */
1702
	rc = -EINVAL;
A
Alan Cox 已提交
1703
	reason = "device reports invalid type";
1704 1705 1706 1707 1708 1709 1710

	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;
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 1737 1738
	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;
	}

1739
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1740 1741 1742 1743 1744 1745 1746 1747 1748
		/*
		 * 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
1749
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1750 1751 1752 1753 1754 1755 1756 1757 1758
			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.
			 */
1759
			flags &= ~ATA_READID_POSTRESET;
1760 1761 1762 1763 1764
			goto retry;
		}
	}

	*p_class = class;
1765

1766 1767 1768
	return 0;

 err_out:
T
Tejun Heo 已提交
1769
	if (ata_msg_warn(ap))
1770
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1771
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
1772 1773 1774
	return rc;
}

T
Tejun Heo 已提交
1775
static inline u8 ata_dev_knobble(struct ata_device *dev)
1776
{
T
Tejun Heo 已提交
1777
	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
1778 1779
}

1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
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
1790
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
1791 1792 1793
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
1794
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
1795
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
1796 1797 1798 1799 1800 1801 1802 1803 1804
		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);
}

1805
/**
1806 1807 1808 1809 1810
 *	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.
1811 1812
 *
 *	LOCKING:
1813 1814 1815 1816
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
1817
 */
1818
int ata_dev_configure(struct ata_device *dev)
1819
{
T
Tejun Heo 已提交
1820
	struct ata_port *ap = dev->ap;
T
Tejun Heo 已提交
1821 1822
	struct ata_eh_context *ehc = &ap->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1823
	const u16 *id = dev->id;
1824
	unsigned int xfer_mask;
1825
	char revbuf[7];		/* XYZ-99\0 */
1826 1827
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
1828
	int rc;
1829

1830
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
1831 1832
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
1833
		return 0;
1834 1835
	}

1836
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1837
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1838

T
Tejun Heo 已提交
1839 1840 1841
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
1842 1843 1844 1845
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
1846

1847
	/* print device capabilities */
1848
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
1849 1850 1851
		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",
1852
			       __FUNCTION__,
1853 1854
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
1855

1856
	/* initialize to-be-configured parameters */
1857
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
1858 1859 1860 1861 1862 1863 1864
	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
1865 1866 1867 1868
	/*
	 * common ATA, ATAPI feature tests
	 */

1869
	/* find max transfer mode; for printk only */
1870
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
1871

1872 1873
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
1874

1875 1876 1877 1878 1879 1880 1881
	/* 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
1882 1883
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
1884 1885
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
1886 1887 1888
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
1889 1890 1891 1892 1893
			snprintf(revbuf, 7, "CFA");
		}
		else
			snprintf(revbuf, 7, "ATA-%d",  ata_id_major_version(id));

1894
		dev->n_sectors = ata_id_n_sectors(id);
1895

1896 1897 1898
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

1899
		if (ata_id_has_lba(id)) {
1900
			const char *lba_desc;
1901
			char ncq_desc[20];
1902

1903 1904
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
1905
			if (ata_id_has_lba48(id)) {
1906
				dev->flags |= ATA_DFLAG_LBA48;
1907
				lba_desc = "LBA48";
1908 1909 1910 1911

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
1912
			}
1913

A
Alan Cox 已提交
1914 1915 1916
			if (ata_id_hpa_enabled(dev->id))
				dev->n_sectors = ata_hpa_resize(dev);

1917 1918 1919
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

1920
			/* print device info to dmesg */
1921 1922 1923 1924 1925 1926 1927
			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",
1928
					(unsigned long long)dev->n_sectors,
1929 1930
					dev->multi_count, lba_desc, ncq_desc);
			}
1931
		} else {
1932 1933 1934
			/* CHS */

			/* Default translation */
1935 1936 1937
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
1938

1939
			if (ata_id_current_chs_valid(id)) {
1940
				/* Current CHS translation is valid. */
1941 1942 1943
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
1944 1945 1946
			}

			/* print device info to dmesg */
1947
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
1948
				ata_dev_printk(dev, KERN_INFO,
1949 1950 1951
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
1952
				ata_dev_printk(dev, KERN_INFO,
1953 1954 1955 1956 1957
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
1958 1959
		}

1960
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
1961 1962 1963
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
1964
	else if (dev->class == ATA_DEV_ATAPI) {
1965 1966
		char *cdb_intr_string = "";

1967
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
1968
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
1969
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
1970 1971
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
1972
			rc = -EINVAL;
L
Linus Torvalds 已提交
1973 1974
			goto err_out_nosup;
		}
1975
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
1976

1977
		if (ata_id_cdb_intr(dev->id)) {
1978
			dev->flags |= ATA_DFLAG_CDB_INTR;
1979 1980
			cdb_intr_string = ", CDB intr";
		}
1981

L
Linus Torvalds 已提交
1982
		/* print device info to dmesg */
1983
		if (ata_msg_drv(ap) && print_info)
1984 1985 1986
			ata_dev_printk(dev, KERN_INFO,
				       "ATAPI: %s, %s, max %s%s\n",
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
1987 1988
				       ata_mode_string(xfer_mask),
				       cdb_intr_string);
L
Linus Torvalds 已提交
1989 1990
	}

1991 1992 1993 1994 1995
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
	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");
		}
	}

2008
	/* limit bridge transfers to udma5, 200 sectors */
T
Tejun Heo 已提交
2009
	if (ata_dev_knobble(dev)) {
2010
		if (ata_msg_drv(ap) && print_info)
2011 2012
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2013
		dev->udma_mask &= ATA_UDMA5;
2014 2015 2016
		dev->max_sectors = ATA_MAX_SECTORS;
	}

T
Tejun Heo 已提交
2017
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2018 2019
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2020

2021
	if (ap->ops->dev_config)
2022
		ap->ops->dev_config(dev);
2023

2024 2025 2026
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2027
	return 0;
L
Linus Torvalds 已提交
2028 2029

err_out_nosup:
2030
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2031 2032
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2033
	return rc;
L
Linus Torvalds 已提交
2034 2035
}

A
Alan Cox 已提交
2036
/**
2037
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2038 2039
 *	@ap: port
 *
2040
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2041 2042 2043 2044 2045 2046 2047 2048 2049
 *	detection.
 */

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

/**
2050
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2051 2052
 *	@ap: port
 *
2053
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
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 2084 2085
 *	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
2086 2087 2088 2089
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2090 2091 2092 2093
 *	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
2094
 *	LOCKING:
J
Jeff Garzik 已提交
2095
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2096 2097
 *
 *	RETURNS:
2098
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2099 2100
 */

2101
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2102
{
2103
	unsigned int classes[ATA_MAX_DEVICES];
2104
	int tries[ATA_MAX_DEVICES];
2105
	int i, rc;
2106
	struct ata_device *dev;
L
Linus Torvalds 已提交
2107

2108
	ata_port_probe(ap);
2109

2110 2111 2112 2113
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		tries[i] = ATA_PROBE_MAX_TRIES;

 retry:
2114
	/* reset and determine device classes */
2115
	ap->ops->phy_reset(ap);
2116

2117 2118
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
2119

2120 2121 2122 2123 2124
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2125

2126
		dev->class = ATA_DEV_UNKNOWN;
2127
	}
L
Linus Torvalds 已提交
2128

2129
	ata_port_probe(ap);
2130

A
Alan Cox 已提交
2131 2132 2133 2134 2135 2136
	/* 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;

2137 2138 2139 2140 2141
	/* 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--) {
2142
		dev = &ap->device[i];
2143

2144 2145
		if (tries[i])
			dev->class = classes[i];
2146

2147
		if (!ata_dev_enabled(dev))
2148 2149
			continue;

2150 2151
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2152 2153
		if (rc)
			goto fail;
2154 2155
	}

A
Alan Cox 已提交
2156 2157 2158 2159
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

2160 2161 2162 2163 2164 2165 2166
	/* 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;
2167

2168 2169 2170
		ap->eh_context.i.flags |= ATA_EHI_PRINTINFO;
		rc = ata_dev_configure(dev);
		ap->eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2171 2172
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2173 2174
	}

2175
	/* configure transfer mode */
2176
	rc = ata_set_mode(ap, &dev);
2177
	if (rc)
2178
		goto fail;
L
Linus Torvalds 已提交
2179

2180 2181 2182
	for (i = 0; i < ATA_MAX_DEVICES; i++)
		if (ata_dev_enabled(&ap->device[i]))
			return 0;
L
Linus Torvalds 已提交
2183

2184 2185
	/* no device present, disable port */
	ata_port_disable(ap);
L
Linus Torvalds 已提交
2186
	ap->ops->port_disable(ap);
2187
	return -ENODEV;
2188 2189

 fail:
2190 2191
	tries[dev->devno]--;

2192 2193
	switch (rc) {
	case -EINVAL:
2194
		/* eeek, something went very wrong, give up */
2195 2196
		tries[dev->devno] = 0;
		break;
2197 2198 2199 2200

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2201
	case -EIO:
2202 2203 2204 2205 2206 2207 2208
		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);
		}
2209 2210
	}

2211
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2212
		ata_dev_disable(dev);
2213

2214
	goto retry;
L
Linus Torvalds 已提交
2215 2216 2217
}

/**
J
Jeff Garzik 已提交
2218 2219
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2220
 *
J
Jeff Garzik 已提交
2221 2222 2223
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2224
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2225
 *	serialization.
L
Linus Torvalds 已提交
2226 2227 2228 2229
 */

void ata_port_probe(struct ata_port *ap)
{
2230
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2231 2232
}

2233 2234 2235 2236 2237 2238 2239 2240 2241
/**
 *	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.
 */
2242
void sata_print_link_status(struct ata_port *ap)
2243
{
2244
	u32 sstatus, scontrol, tmp;
2245

2246
	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
2247
		return;
2248
	sata_scr_read(ap, SCR_CONTROL, &scontrol);
2249

2250
	if (ata_port_online(ap)) {
2251
		tmp = (sstatus >> 4) & 0xf;
2252 2253 2254
		ata_port_printk(ap, KERN_INFO,
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2255
	} else {
2256 2257 2258
		ata_port_printk(ap, KERN_INFO,
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2259 2260 2261
	}
}

L
Linus Torvalds 已提交
2262
/**
J
Jeff Garzik 已提交
2263 2264
 *	__sata_phy_reset - Wake/reset a low-level SATA PHY
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2265
 *
J
Jeff Garzik 已提交
2266 2267 2268
 *	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
2269 2270
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2271
 *	PCI/etc. bus probe sem.
L
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2272 2273 2274 2275 2276 2277 2278 2279
 *
 */
void __sata_phy_reset(struct ata_port *ap)
{
	u32 sstatus;
	unsigned long timeout = jiffies + (HZ * 5);

	if (ap->flags & ATA_FLAG_SATA_RESET) {
2280
		/* issue phy wake/reset */
2281
		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
2282 2283 2284
		/* 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
2285
	}
2286 2287
	/* phy wake/clear reset */
	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
L
Linus Torvalds 已提交
2288 2289 2290 2291

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
2292
		sata_scr_read(ap, SCR_STATUS, &sstatus);
L
Linus Torvalds 已提交
2293 2294 2295 2296
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

2297 2298
	/* print link status */
	sata_print_link_status(ap);
2299

2300
	/* TODO: phy layer with polling, timeouts, etc. */
2301
	if (!ata_port_offline(ap))
L
Linus Torvalds 已提交
2302
		ata_port_probe(ap);
2303
	else
L
Linus Torvalds 已提交
2304 2305
		ata_port_disable(ap);

2306
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
		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
2318 2319
 *	sata_phy_reset - Reset SATA bus.
 *	@ap: SATA port associated with target SATA PHY.
L
Linus Torvalds 已提交
2320
 *
J
Jeff Garzik 已提交
2321 2322
 *	This function resets the SATA bus, and then probes
 *	the bus for devices.
L
Linus Torvalds 已提交
2323 2324
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2325
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2326 2327 2328 2329 2330
 *
 */
void sata_phy_reset(struct ata_port *ap)
{
	__sata_phy_reset(ap);
2331
	if (ap->flags & ATA_FLAG_DISABLED)
L
Linus Torvalds 已提交
2332 2333 2334 2335
		return;
	ata_bus_reset(ap);
}

2336 2337 2338 2339 2340 2341 2342
/**
 *	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
 */
2343

T
Tejun Heo 已提交
2344
struct ata_device *ata_dev_pair(struct ata_device *adev)
2345
{
T
Tejun Heo 已提交
2346
	struct ata_port *ap = adev->ap;
2347
	struct ata_device *pair = &ap->device[1 - adev->devno];
2348
	if (!ata_dev_enabled(pair))
2349 2350 2351 2352
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2353
/**
J
Jeff Garzik 已提交
2354 2355
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2356
 *
J
Jeff Garzik 已提交
2357 2358 2359 2360 2361
 *	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
2362
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2363
 *	serialization.
L
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2364 2365 2366 2367 2368 2369
 */

void ata_port_disable(struct ata_port *ap)
{
	ap->device[0].class = ATA_DEV_NONE;
	ap->device[1].class = ATA_DEV_NONE;
2370
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2371 2372
}

2373
/**
2374
 *	sata_down_spd_limit - adjust SATA spd limit downward
2375 2376 2377 2378
 *	@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
2379
 *	using sata_set_spd().
2380 2381 2382 2383 2384 2385 2386
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2387
int sata_down_spd_limit(struct ata_port *ap)
2388
{
2389 2390
	u32 sstatus, spd, mask;
	int rc, highbit;
2391

2392 2393 2394 2395 2396 2397
	if (!sata_scr_valid(ap))
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
	 * If not, use cached value in ap->sata_spd.
	 */
2398
	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
2399 2400 2401 2402
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
		spd = ap->sata_spd;
2403 2404 2405 2406

	mask = ap->sata_spd_limit;
	if (mask <= 1)
		return -EINVAL;
2407 2408

	/* unconditionally mask off the highest bit */
2409 2410 2411
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2412 2413 2414 2415 2416 2417 2418 2419 2420
	/* Mask off all speeds higher than or equal to the current
	 * one.  Force 1.5Gbps if current SPD is not available.
	 */
	if (spd > 1)
		mask &= (1 << (spd - 1)) - 1;
	else
		mask &= 1;

	/* were we already at the bottom? */
2421 2422 2423 2424 2425
	if (!mask)
		return -EINVAL;

	ap->sata_spd_limit = mask;

2426 2427
	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
			sata_spd_string(fls(mask)));
2428 2429 2430 2431

	return 0;
}

2432
static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447
{
	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;
}

/**
2448
 *	sata_set_spd_needed - is SATA spd configuration needed
2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461
 *	@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.
 */
2462
int sata_set_spd_needed(struct ata_port *ap)
2463 2464 2465
{
	u32 scontrol;

2466
	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
2467 2468
		return 0;

2469
	return __sata_set_spd_needed(ap, &scontrol);
2470 2471 2472
}

/**
2473
 *	sata_set_spd - set SATA spd according to spd limit
2474 2475 2476 2477 2478 2479 2480 2481 2482
 *	@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
2483
 *	changed.  Negative errno if SCR registers are inaccessible.
2484
 */
2485
int sata_set_spd(struct ata_port *ap)
2486 2487
{
	u32 scontrol;
2488
	int rc;
2489

2490 2491
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
2492

2493
	if (!__sata_set_spd_needed(ap, &scontrol))
2494 2495
		return 0;

2496 2497 2498
	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;

2499 2500 2501
	return 1;
}

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Alan Cox 已提交
2502 2503 2504 2505 2506
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2507
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2508
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2509 2510 2511
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
A
Alan Cox 已提交
2512 2513 2514 2515 2516 2517 2518 2519 2520
 */

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 },

2521 2522
	{ 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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2523 2524 2525 2526 2527
	{ 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 }, */
2528

A
Alan Cox 已提交
2529 2530 2531
	{ 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 },
2532

A
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2533 2534 2535 2536
	{ 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 },

2537 2538
	{ 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
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 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583
	{ 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
2584
		if (t->mode == 0xFF)
A
Alan Cox 已提交
2585
			return NULL;
2586
	return t;
A
Alan Cox 已提交
2587 2588 2589 2590 2591 2592 2593 2594 2595
}

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;

	/*
2596
	 * Find the mode.
2597
	 */
A
Alan Cox 已提交
2598 2599 2600 2601

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

2602 2603
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
	/*
	 * 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.
	 */

2624
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2625 2626

	/*
2627 2628 2629
	 * 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
2630 2631
	 */

2632
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2633 2634 2635 2636 2637
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2638
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649
	 */

	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
2650

2651 2652 2653 2654 2655
	/* 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
2656 2657 2658 2659

	return 0;
}

2660 2661 2662
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2663
 *	@sel: ATA_DNXFER_* selector
2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674
 *
 *	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
 */
2675
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2676
{
2677 2678 2679 2680
	char buf[32];
	unsigned int orig_mask, xfer_mask;
	unsigned int pio_mask, mwdma_mask, udma_mask;
	int quiet, highbit;
2681

2682 2683
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2684

2685 2686 2687 2688
	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);
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 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
	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);
	}
2742 2743 2744 2745 2746 2747 2748

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

	return 0;
}

T
Tejun Heo 已提交
2749
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
2750
{
2751
	struct ata_eh_context *ehc = &dev->ap->eh_context;
2752 2753
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
2754

2755
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
2756 2757 2758
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
2759
	err_mask = ata_dev_set_xfermode(dev);
2760 2761 2762 2763
	/* 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;

2764
	if (err_mask) {
2765 2766
		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
			       "(err_mask=0x%x)\n", err_mask);
2767 2768
		return -EIO;
	}
L
Linus Torvalds 已提交
2769

2770
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
T
Tejun Heo 已提交
2771
	rc = ata_dev_revalidate(dev, 0);
2772
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
2773
	if (rc)
2774
		return rc;
2775

2776 2777
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
2778

2779 2780
	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
2781
	return 0;
L
Linus Torvalds 已提交
2782 2783 2784
}

/**
2785
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
L
Linus Torvalds 已提交
2786
 *	@ap: port on which timings will be programmed
2787
 *	@r_failed_dev: out paramter for failed device
L
Linus Torvalds 已提交
2788
 *
2789 2790 2791
 *	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
2792
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
2793
 *
L
Linus Torvalds 已提交
2794
 *	LOCKING:
J
Jeff Garzik 已提交
2795
 *	PCI/etc. bus probe sem.
2796 2797 2798
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
2799
 */
2800 2801

int ata_do_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
2802
{
2803
	struct ata_device *dev;
2804
	int i, rc = 0, used_dma = 0, found = 0;
L
Linus Torvalds 已提交
2805

2806

2807 2808
	/* step 1: calculate xfer_mask */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2809
		unsigned int pio_mask, dma_mask;
2810

2811 2812
		dev = &ap->device[i];

2813
		if (!ata_dev_enabled(dev))
2814 2815
			continue;

T
Tejun Heo 已提交
2816
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
2817

2818 2819 2820 2821
		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);
2822

2823
		found = 1;
2824 2825
		if (dev->dma_mode)
			used_dma = 1;
2826
	}
2827
	if (!found)
2828
		goto out;
2829 2830

	/* step 2: always set host PIO timings */
2831 2832 2833 2834 2835 2836
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];
		if (!ata_dev_enabled(dev))
			continue;

		if (!dev->pio_mode) {
2837
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
2838
			rc = -EINVAL;
2839
			goto out;
2840 2841 2842 2843 2844 2845 2846
		}

		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
2847

2848
	/* step 3: set host DMA timings */
2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859
	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
2860 2861

	/* step 4: update devices' xfer mode */
2862
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
2863
		dev = &ap->device[i];
L
Linus Torvalds 已提交
2864

A
Alan 已提交
2865
		/* don't update suspended devices' xfer mode */
2866
		if (!ata_dev_enabled(dev))
2867 2868
			continue;

T
Tejun Heo 已提交
2869
		rc = ata_dev_set_mode(dev);
2870
		if (rc)
2871
			goto out;
2872
	}
L
Linus Torvalds 已提交
2873

2874 2875
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
2876
	 */
J
Jeff Garzik 已提交
2877
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
2878
		ap->host->simplex_claimed = ap;
2879

2880 2881 2882 2883
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
2884 2885
}

2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908
/**
 *	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);
}

2909 2910 2911 2912 2913 2914 2915 2916 2917 2918
/**
 *	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
2919
 *	spin_lock_irqsave(host lock)
2920 2921 2922 2923 2924 2925 2926 2927 2928
 */

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
2929 2930 2931 2932 2933 2934
/**
 *	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
2935 2936 2937
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
2938 2939 2940 2941 2942
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
2943
 */
2944 2945
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
2946 2947 2948 2949 2950 2951 2952
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
2953 2954
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2955 2956 2957 2958
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

2959
	if (status != 0xff && (status & ATA_BUSY))
2960
		ata_port_printk(ap, KERN_WARNING,
2961 2962
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
2963 2964

	timeout = timer_start + tmout;
2965 2966
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
2967 2968 2969 2970
		msleep(50);
		status = ata_chk_status(ap);
	}

2971 2972 2973
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
2974
	if (status & ATA_BUSY) {
2975
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
2976 2977
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
2978
		return -EBUSY;
L
Linus Torvalds 已提交
2979 2980 2981 2982 2983
	}

	return 0;
}

2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008
/**
 *	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;
3009
		if (!ata_port_online(ap) && status == 0xff)
3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027
			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
3028 3029 3030 3031
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3032
	int rc, ret = 0;
L
Linus Torvalds 已提交
3033 3034 3035 3036

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3037 3038
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3039 3040 3041 3042 3043
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3044
	}
L
Linus Torvalds 已提交
3045

3046 3047
	/* 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
3048
	 */
3049 3050
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3051 3052

		ap->ops->dev_select(ap, 1);
3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067

		/* 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 */
		}

3068
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3069 3070 3071 3072 3073
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3074
	}
L
Linus Torvalds 已提交
3075 3076 3077 3078 3079 3080 3081

	/* 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);
3082

T
Tejun Heo 已提交
3083
	return ret;
L
Linus Torvalds 已提交
3084 3085
}

3086 3087
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3088 3089 3090
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3091
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3092 3093

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3094 3095 3096 3097 3098
	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
3099 3100 3101 3102 3103 3104 3105 3106

	/* 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.
3107 3108
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready
L
Linus Torvalds 已提交
3109 3110 3111
	 */
	msleep(150);

3112
	/* Before we perform post reset processing we want to see if
3113 3114 3115
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3116
	if (ata_check_status(ap) == 0xFF)
T
Tejun Heo 已提交
3117
		return -ENODEV;
3118

3119
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134
}

/**
 *	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
3135
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3136
 *	Obtains host lock.
L
Linus Torvalds 已提交
3137 3138
 *
 *	SIDE EFFECTS:
3139
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3140 3141 3142 3143 3144 3145 3146
 */

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
3147
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3148
	int rc;
L
Linus Torvalds 已提交
3149

T
Tejun Heo 已提交
3150
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169

	/* 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
3170 3171 3172
	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
3173
			goto err_out;
T
Tejun Heo 已提交
3174
	}
L
Linus Torvalds 已提交
3175 3176 3177 3178

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3179
	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
L
Linus Torvalds 已提交
3180
	if ((slave_possible) && (err != 0x81))
3181
		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
L
Linus Torvalds 已提交
3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195

	/* 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
3196
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3197 3198 3199 3200 3201 3202
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3203
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
L
Linus Torvalds 已提交
3204 3205 3206 3207 3208
	ap->ops->port_disable(ap);

	DPRINTK("EXIT\n");
}

3209 3210 3211 3212
/**
 *	sata_phy_debounce - debounce SATA phy status
 *	@ap: ATA port to debounce SATA phy status for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3213
 *	@deadline: deadline jiffies for the operation
3214 3215 3216 3217
 *
 *	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
3218 3219
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3220 3221
 *	until timeout then returns 0 if DET is stable at 1.
 *
3222 3223 3224
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3225 3226 3227 3228 3229 3230
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3231 3232
int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
		      unsigned long deadline)
3233
{
3234
	unsigned long interval_msec = params[0];
3235 3236
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3237 3238 3239
	u32 last, cur;
	int rc;

3240 3241 3242 3243
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258
	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) {
3259
			if (cur == 1 && time_before(jiffies, deadline))
3260 3261 3262 3263 3264 3265 3266 3267 3268 3269
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3270 3271 3272
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3273
		if (time_after(jiffies, deadline))
3274
			return -EPIPE;
3275 3276 3277 3278 3279 3280 3281
	}
}

/**
 *	sata_phy_resume - resume SATA phy
 *	@ap: ATA port to resume SATA phy for
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3282
 *	@deadline: deadline jiffies for the operation
3283 3284 3285 3286 3287 3288 3289 3290 3291
 *
 *	Resume SATA phy of @ap and debounce it.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3292 3293
int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
		    unsigned long deadline)
3294 3295
{
	u32 scontrol;
3296 3297 3298 3299
	int rc;

	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
		return rc;
3300

3301
	scontrol = (scontrol & 0x0f0) | 0x300;
3302 3303 3304

	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
		return rc;
3305

3306 3307 3308 3309
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3310

3311
	return sata_phy_debounce(ap, params, deadline);
3312 3313
}

3314 3315 3316
/**
 *	ata_std_prereset - prepare for reset
 *	@ap: ATA port to be reset
3317
 *	@deadline: deadline jiffies for the operation
3318
 *
T
Tejun Heo 已提交
3319 3320 3321 3322 3323
 *	@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.
3324 3325 3326 3327 3328 3329 3330
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3331
int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
3332 3333
{
	struct ata_eh_context *ehc = &ap->eh_context;
3334
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3335 3336
	int rc;

T
Tejun Heo 已提交
3337
	/* handle link resume */
3338 3339 3340 3341
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
		ehc->i.action |= ATA_EH_HARDRESET;

3342 3343 3344 3345 3346
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

	/* if SATA, resume phy */
3347
	if (ap->flags & ATA_FLAG_SATA) {
3348
		rc = sata_phy_resume(ap, timing, deadline);
T
Tejun Heo 已提交
3349 3350
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3351 3352 3353 3354 3355 3356 3357
			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
3358 3359
	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
		rc = ata_wait_ready(ap, deadline);
3360
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3361 3362 3363 3364 3365
			ata_port_printk(ap, KERN_WARNING, "device not ready "
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3366 3367 3368 3369

	return 0;
}

3370 3371 3372 3373
/**
 *	ata_std_softreset - reset host port via ATA SRST
 *	@ap: port to reset
 *	@classes: resulting classes of attached devices
3374
 *	@deadline: deadline jiffies for the operation
3375
 *
3376
 *	Reset host port using ATA SRST.
3377 3378 3379 3380 3381 3382 3383
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3384 3385
int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
		      unsigned long deadline)
3386 3387
{
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3388 3389
	unsigned int devmask = 0;
	int rc;
3390 3391 3392 3393
	u8 err;

	DPRINTK("ENTER\n");

3394
	if (ata_port_offline(ap)) {
3395 3396 3397 3398
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409
	/* 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);
3410
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3411 3412
	/* if link is occupied, -ENODEV too is an error */
	if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
3413 3414
		ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
		return rc;
3415 3416 3417 3418 3419 3420 3421
	}

	/* 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);

3422
 out:
3423 3424 3425 3426 3427
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
3428
 *	sata_port_hardreset - reset port via SATA phy reset
3429
 *	@ap: port to reset
3430
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3431
 *	@deadline: deadline jiffies for the operation
3432 3433 3434 3435 3436 3437 3438 3439 3440
 *
 *	SATA phy-reset host port using DET bits of SControl register.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3441 3442
int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
			unsigned long deadline)
3443
{
3444
	u32 scontrol;
3445
	int rc;
3446

3447 3448
	DPRINTK("ENTER\n");

3449
	if (sata_set_spd_needed(ap)) {
3450 3451 3452 3453 3454
		/* 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.
		 */
3455
		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3456
			goto out;
3457

3458
		scontrol = (scontrol & 0x0f0) | 0x304;
3459 3460

		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
3461
			goto out;
3462

3463
		sata_set_spd(ap);
3464 3465 3466
	}

	/* issue phy wake/reset */
3467
	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
3468
		goto out;
3469

3470
	scontrol = (scontrol & 0x0f0) | 0x301;
3471 3472

	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
3473
		goto out;
3474

3475
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3476 3477 3478 3479
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3480
	/* bring phy back */
3481
	rc = sata_phy_resume(ap, timing, deadline);
3482 3483 3484 3485 3486 3487 3488 3489 3490
 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
3491
 *	@deadline: deadline jiffies for the operation
3492 3493 3494 3495 3496 3497 3498 3499 3500 3501
 *
 *	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.
 */
3502 3503
int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
		       unsigned long deadline)
3504 3505 3506 3507 3508 3509 3510
{
	const unsigned long *timing = sata_ehc_deb_timing(&ap->eh_context);
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
3511
	rc = sata_port_hardreset(ap, timing, deadline);
3512 3513 3514 3515 3516
	if (rc) {
		ata_port_printk(ap, KERN_ERR,
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3517 3518

	/* TODO: phy layer with polling, timeouts, etc. */
3519
	if (ata_port_offline(ap)) {
3520 3521 3522 3523 3524
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3525 3526 3527
	/* wait a while before checking status, see SRST for more info */
	msleep(150);

3528
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3529 3530
	/* link occupied, -ENODEV too is an error */
	if (rc) {
3531
		ata_port_printk(ap, KERN_ERR,
3532 3533
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3534 3535
	}

3536 3537
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557
	*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)
{
3558 3559
	u32 serror;

3560 3561 3562
	DPRINTK("ENTER\n");

	/* print link status */
3563
	sata_print_link_status(ap);
3564

3565 3566 3567 3568
	/* clear SError */
	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
		sata_scr_write(ap, SCR_ERROR, serror);

3569 3570 3571 3572 3573 3574
	/* 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);

3575 3576 3577 3578 3579 3580 3581
	/* 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
3582 3583
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3584 3585 3586 3587

	DPRINTK("EXIT\n");
}

3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603
/**
 *	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
3604 3605
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3606 3607
{
	const u16 *old_id = dev->id;
3608 3609
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3610 3611

	if (dev->class != new_class) {
3612 3613
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3614 3615 3616
		return 0;
	}

3617 3618 3619 3620
	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]));
3621 3622

	if (strcmp(model[0], model[1])) {
3623 3624
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
3625 3626 3627 3628
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3629 3630
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
3631 3632 3633 3634 3635 3636 3637
		return 0;
	}

	return 1;
}

/**
3638
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3639
 *	@dev: target ATA device
3640
 *	@readid_flags: read ID flags
3641 3642 3643 3644 3645 3646 3647 3648 3649 3650
 *
 *	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
 */
3651
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3652
{
3653
	unsigned int class = dev->class;
3654
	u16 *id = (void *)dev->ap->sector_buf;
3655 3656
	int rc;

3657
	/* read ID data */
3658
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3659
	if (rc)
3660
		return rc;
3661 3662

	/* is the device still there? */
3663 3664
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3665

3666
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685
	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)
{
3686
	u64 n_sectors = dev->n_sectors;
3687 3688 3689 3690 3691 3692 3693 3694 3695
	int rc;

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

	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
3696 3697

	/* configure device according to the new ID */
3698
	rc = ata_dev_configure(dev);
3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712
	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;
3713 3714

 fail:
3715
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
3716 3717 3718
	return rc;
}

3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755
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 },
3756
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3757
	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
3758 3759
	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
				NULL,		ATA_HORKAGE_NODMA },
3760

3761
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
3762
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3763

3764 3765 3766 3767 3768
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
        { "WDC WD740ADFD-00",   NULL,		ATA_HORKAGE_NONCQ },
3769 3770
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3771 3772
	/* NCQ is broken */
	{ "Maxtor 6L250S0",     "BANC1G10",     ATA_HORKAGE_NONCQ },
3773
	{ "Maxtor 6B200M0",	"BANC1BM0",	ATA_HORKAGE_NONCQ },
3774
	{ "Maxtor 6B200M0",	"BANC1B10",	ATA_HORKAGE_NONCQ },
3775 3776
	{ "HITACHI HDS7250SASUN500G 0621KTAWSD", "K2AOAJ0AHITACHI",
	 ATA_HORKAGE_NONCQ },
3777 3778
	/* NCQ hard hangs device under heavier load, needs hard power cycle */
	{ "Maxtor 6B250S0",	"BANC1B70",	ATA_HORKAGE_NONCQ },
3779 3780 3781 3782 3783
	/* 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, },
3784 3785
	/* Drives which do spurious command completion */
	{ "HTS541680J9SA00",	"SB2IC7EP",	ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3786
	{ "HTS541612J9SA00",	"SBDIC7JP",	ATA_HORKAGE_NONCQ, },
3787
	{ "Hitachi HTS541616J9SA00", "SB4OC70P", ATA_HORKAGE_NONCQ, },
T
Tejun Heo 已提交
3788
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
3789
	{ "FUJITSU MHV2080BH",	"00840028",	ATA_HORKAGE_NONCQ, },
3790
	{ "ST9160821AS",	"3.CLF",	ATA_HORKAGE_NONCQ, },
3791 3792 3793 3794 3795

	/* Devices with NCQ limits */

	/* End Marker */
	{ }
L
Linus Torvalds 已提交
3796
};
3797

T
Tejun Heo 已提交
3798
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
3799
{
T
Tejun Heo 已提交
3800 3801
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
3802
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
3803

T
Tejun Heo 已提交
3804 3805
	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
3806

3807
	while (ad->model_num) {
T
Tejun Heo 已提交
3808
		if (!strcmp(ad->model_num, model_num)) {
3809 3810
			if (ad->model_rev == NULL)
				return ad->horkage;
T
Tejun Heo 已提交
3811
			if (!strcmp(ad->model_rev, model_rev))
3812
				return ad->horkage;
3813
		}
3814
		ad++;
3815
	}
L
Linus Torvalds 已提交
3816 3817 3818
	return 0;
}

3819 3820 3821 3822 3823 3824 3825 3826 3827
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
3828
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
3829 3830
}

3831 3832 3833 3834
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
3835 3836 3837 3838
 *	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...
3839 3840 3841 3842
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
3843
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
3844
{
T
Tejun Heo 已提交
3845
	struct ata_port *ap = dev->ap;
J
Jeff Garzik 已提交
3846
	struct ata_host *host = ap->host;
3847
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
3848

3849
	/* controller modes available */
3850 3851 3852
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

3853
	/* drive modes available */
3854 3855 3856
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
3857

3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868
	/*
	 *	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));
	}

3869 3870
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
3871 3872
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
3873
	}
3874

3875 3876
	if ((host->flags & ATA_HOST_SIMPLEX) &&
            host->simplex_claimed && host->simplex_claimed != ap) {
3877 3878 3879
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
3880
	}
3881

J
Jeff Garzik 已提交
3882 3883 3884
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

3885
	if (ap->ops->mode_filter)
3886
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
3887

3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906
	/* 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);
		}

3907 3908
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
3909 3910 3911 3912 3913 3914
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
3915 3916 3917
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
3918
 *	LOCKING:
J
Jeff Garzik 已提交
3919
 *	PCI/etc. bus probe sem.
3920 3921 3922
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
3923 3924
 */

T
Tejun Heo 已提交
3925
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
3926
{
3927
	struct ata_taskfile tf;
3928
	unsigned int err_mask;
L
Linus Torvalds 已提交
3929 3930 3931 3932

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

T
Tejun Heo 已提交
3933 3934 3935
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
3936
	ata_tf_init(dev, &tf);
3937 3938
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
3939
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
3940 3941
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = dev->xfer_mode;
L
Linus Torvalds 已提交
3942

T
Tejun Heo 已提交
3943
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
L
Linus Torvalds 已提交
3944

3945 3946
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
3947 3948
}

3949 3950 3951
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
3952 3953
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
3954 3955
 *
 *	LOCKING:
3956 3957 3958 3959
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
3960
 */
T
Tejun Heo 已提交
3961 3962
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
3963
{
3964
	struct ata_taskfile tf;
3965
	unsigned int err_mask;
3966 3967 3968

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
3969
		return AC_ERR_INVALID;
3970 3971 3972 3973

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

T
Tejun Heo 已提交
3974
	ata_tf_init(dev, &tf);
3975 3976 3977 3978 3979
	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 */
3980

T
Tejun Heo 已提交
3981
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
3982

3983 3984
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
3985 3986
}

L
Linus Torvalds 已提交
3987
/**
J
Jeff Garzik 已提交
3988 3989 3990 3991
 *	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
3992 3993
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3994
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
3995
 */
3996
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
3997 3998
{
	struct ata_port *ap = qc->ap;
3999
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4000
	int dir = qc->dma_dir;
4001
	void *pad_buf = NULL;
L
Linus Torvalds 已提交
4002

4003 4004
	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4005 4006

	if (qc->flags & ATA_QCFLAG_SINGLE)
J
Jeff Garzik 已提交
4007
		WARN_ON(qc->n_elem > 1);
L
Linus Torvalds 已提交
4008

J
Jeff Garzik 已提交
4009
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4010

4011 4012 4013 4014 4015 4016 4017 4018
	/* 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) {
4019
		if (qc->n_elem)
4020
			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
4021 4022 4023 4024 4025 4026
		/* 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);
4027
			kunmap_atomic(addr, KM_IRQ0);
4028 4029
		}
	} else {
4030
		if (qc->n_elem)
4031
			dma_unmap_single(ap->dev,
4032 4033
				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
				dir);
4034 4035 4036 4037 4038 4039
		/* 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
4040 4041

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4042
	qc->__sg = NULL;
L
Linus Torvalds 已提交
4043 4044 4045 4046 4047 4048
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4049 4050 4051
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4052
 *	LOCKING:
J
Jeff Garzik 已提交
4053
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4054 4055 4056 4057 4058
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4059 4060
	struct scatterlist *sg;
	unsigned int idx;
L
Linus Torvalds 已提交
4061

4062
	WARN_ON(qc->__sg == NULL);
J
Jeff Garzik 已提交
4063
	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
L
Linus Torvalds 已提交
4064 4065

	idx = 0;
4066
	ata_for_each_sg(sg, qc) {
L
Linus Torvalds 已提交
4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095
		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);
}
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 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158
/**
 *	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
4159 4160 4161 4162
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4163 4164 4165 4166
 *	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
4167
 *	LOCKING:
J
Jeff Garzik 已提交
4168
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4169
 *
L
Linus Torvalds 已提交
4170 4171 4172 4173 4174 4175
 *	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;
4176 4177 4178 4179 4180 4181

	/* 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;
4182

L
Linus Torvalds 已提交
4183
	if (ap->ops->check_atapi_dma)
4184
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4185

4186
	return 0;
L
Linus Torvalds 已提交
4187
}
4188

L
Linus Torvalds 已提交
4189 4190 4191 4192
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4193 4194
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4195
 *	LOCKING:
J
Jeff Garzik 已提交
4196
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4197 4198 4199 4200 4201 4202 4203 4204 4205
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222
/**
 *	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);
}

4223 4224
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4225 4226 4227 4228 4229 4230 4231 4232 4233 4234
/**
 *	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
4235
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4236 4237
 */

L
Linus Torvalds 已提交
4238 4239 4240 4241
void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
{
	qc->flags |= ATA_QCFLAG_SINGLE;

4242
	qc->__sg = &qc->sgent;
L
Linus Torvalds 已提交
4243
	qc->n_elem = 1;
4244
	qc->orig_n_elem = 1;
L
Linus Torvalds 已提交
4245
	qc->buf_virt = buf;
4246
	qc->nbytes = buflen;
L
Linus Torvalds 已提交
4247

4248
	sg_init_one(&qc->sgent, buf, buflen);
L
Linus Torvalds 已提交
4249 4250
}

J
Jeff Garzik 已提交
4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261
/**
 *	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
4262
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4263 4264
 */

L
Linus Torvalds 已提交
4265 4266 4267 4268
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->flags |= ATA_QCFLAG_SG;
4269
	qc->__sg = sg;
L
Linus Torvalds 已提交
4270
	qc->n_elem = n_elem;
4271
	qc->orig_n_elem = n_elem;
L
Linus Torvalds 已提交
4272 4273 4274
}

/**
J
Jeff Garzik 已提交
4275 4276 4277 4278
 *	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
4279 4280
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4281
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4282 4283
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4284
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4285 4286 4287 4288 4289 4290
 */

static int ata_sg_setup_one(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	int dir = qc->dma_dir;
4291
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4292
	dma_addr_t dma_address;
4293
	int trim_sg = 0;
L
Linus Torvalds 已提交
4294

4295 4296 4297 4298 4299 4300
	/* 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;

4301
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312

		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;
4313 4314
		if (sg->length == 0)
			trim_sg = 1;
4315 4316 4317 4318 4319

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

4320 4321
	if (trim_sg) {
		qc->n_elem--;
4322 4323 4324
		goto skip_map;
	}

4325
	dma_address = dma_map_single(ap->dev, qc->buf_virt,
4326
				     sg->length, dir);
4327 4328 4329
	if (dma_mapping_error(dma_address)) {
		/* restore sg */
		sg->length += qc->pad_len;
L
Linus Torvalds 已提交
4330
		return -1;
4331
	}
L
Linus Torvalds 已提交
4332 4333

	sg_dma_address(sg) = dma_address;
4334
	sg_dma_len(sg) = sg->length;
L
Linus Torvalds 已提交
4335

4336
skip_map:
L
Linus Torvalds 已提交
4337 4338 4339 4340 4341 4342 4343
	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
4344 4345 4346 4347
 *	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
4348 4349
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4350
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4351 4352
 *
 *	RETURNS:
J
Jeff Garzik 已提交
4353
 *	Zero on success, negative on error.
L
Linus Torvalds 已提交
4354 4355 4356 4357 4358 4359
 *
 */

static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4360 4361
	struct scatterlist *sg = qc->__sg;
	struct scatterlist *lsg = &sg[qc->n_elem - 1];
4362
	int n_elem, pre_n_elem, dir, trim_sg = 0;
L
Linus Torvalds 已提交
4363

T
Tejun Heo 已提交
4364
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4365
	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
L
Linus Torvalds 已提交
4366

4367 4368 4369 4370 4371 4372 4373
	/* 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;

4374
		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388

		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);
4389
			kunmap_atomic(addr, KM_IRQ0);
4390 4391 4392 4393 4394 4395
		}

		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;
4396 4397
		if (lsg->length == 0)
			trim_sg = 1;
4398 4399 4400 4401 4402

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

4403 4404 4405 4406 4407 4408 4409 4410 4411
	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
4412
	dir = qc->dma_dir;
4413
	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
4414 4415 4416
	if (n_elem < 1) {
		/* restore last sg */
		lsg->length += qc->pad_len;
L
Linus Torvalds 已提交
4417
		return -1;
4418
	}
L
Linus Torvalds 已提交
4419 4420 4421

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

4422
skip_map:
L
Linus Torvalds 已提交
4423 4424 4425 4426 4427
	qc->n_elem = n_elem;

	return 0;
}

E
Edward Falk 已提交
4428
/**
4429
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4430 4431 4432 4433 4434 4435 4436 4437
 *	@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
4438
 *	Inherited from caller.
E
Edward Falk 已提交
4439
 */
L
Linus Torvalds 已提交
4440 4441 4442 4443 4444 4445 4446 4447 4448 4449
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
4450
/**
T
Tejun Heo 已提交
4451
 *	ata_data_xfer - Transfer data by PIO
4452
 *	@adev: device to target
A
Albert Lee 已提交
4453 4454
 *	@buf: data buffer
 *	@buflen: buffer length
4455
 *	@write_data: read/write
A
Albert Lee 已提交
4456 4457 4458 4459 4460 4461
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4462 4463
void ata_data_xfer(struct ata_device *adev, unsigned char *buf,
		   unsigned int buflen, int write_data)
L
Linus Torvalds 已提交
4464
{
4465
	struct ata_port *ap = adev->ap;
A
Albert Lee 已提交
4466
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4467

A
Albert Lee 已提交
4468
	/* Transfer multiple of 2 bytes */
L
Linus Torvalds 已提交
4469
	if (write_data)
T
Tejun Heo 已提交
4470
		iowrite16_rep(ap->ioaddr.data_addr, buf, words);
L
Linus Torvalds 已提交
4471
	else
T
Tejun Heo 已提交
4472
		ioread16_rep(ap->ioaddr.data_addr, buf, words);
A
Albert Lee 已提交
4473 4474 4475 4476 4477 4478 4479 4480

	/* 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
4481
			iowrite16(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
A
Albert Lee 已提交
4482
		} else {
T
Tejun Heo 已提交
4483
			align_buf[0] = cpu_to_le16(ioread16(ap->ioaddr.data_addr));
A
Albert Lee 已提交
4484 4485 4486
			memcpy(trailing_buf, align_buf, 1);
		}
	}
L
Linus Torvalds 已提交
4487 4488
}

4489
/**
T
Tejun Heo 已提交
4490
 *	ata_data_xfer_noirq - Transfer data by PIO
4491 4492 4493 4494 4495
 *	@adev: device to target
 *	@buf: data buffer
 *	@buflen: buffer length
 *	@write_data: read/write
 *
T
Tejun Heo 已提交
4496
 *	Transfer data from/to the device data register by PIO. Do the
4497 4498 4499 4500 4501
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
T
Tejun Heo 已提交
4502 4503
void ata_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			 unsigned int buflen, int write_data)
4504 4505 4506
{
	unsigned long flags;
	local_irq_save(flags);
T
Tejun Heo 已提交
4507
	ata_data_xfer(adev, buf, buflen, write_data);
4508 4509 4510 4511
	local_irq_restore(flags);
}


A
Albert Lee 已提交
4512
/**
4513
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4514 4515
 *	@qc: Command on going
 *
4516
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4517 4518 4519 4520 4521
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4522 4523 4524
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4525
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4526 4527 4528 4529 4530
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4531
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4532
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4533 4534

	page = sg[qc->cursg].page;
T
Tejun Heo 已提交
4535
	offset = sg[qc->cursg].offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4536 4537 4538 4539 4540 4541 4542

	/* 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");

4543 4544 4545
	if (PageHighMem(page)) {
		unsigned long flags;

4546
		/* FIXME: use a bounce buffer */
4547 4548
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4549

4550
		/* do the actual data transfer */
4551
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4552

4553 4554 4555 4556
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4557
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4558
	}
L
Linus Torvalds 已提交
4559

4560 4561
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4562

T
Tejun Heo 已提交
4563
	if (qc->cursg_ofs == (&sg[qc->cursg])->length) {
L
Linus Torvalds 已提交
4564 4565 4566 4567 4568
		qc->cursg++;
		qc->cursg_ofs = 0;
	}
}

4569
/**
4570
 *	ata_pio_sectors - Transfer one or many sectors.
4571 4572
 *	@qc: Command on going
 *
4573
 *	Transfer one or many sectors of data from/to the
4574 4575 4576 4577 4578
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4579

4580 4581 4582 4583 4584 4585
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
4586
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4587

4588
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4589
			    qc->dev->multi_count);
4590 4591 4592 4593 4594 4595
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
}

4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611
/**
 *	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");
4612
	WARN_ON(qc->dev->cdb_len < 12);
4613

4614
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629
	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
4630 4631
}

A
Albert Lee 已提交
4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643
/**
 *	__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
4644 4645 4646
static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
4647
	struct scatterlist *sg = qc->__sg;
L
Linus Torvalds 已提交
4648 4649 4650 4651 4652
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned char *buf;
	unsigned int offset, count;

4653
	if (qc->curbytes + bytes >= qc->nbytes)
A
Albert Lee 已提交
4654
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4655 4656

next_sg:
4657
	if (unlikely(qc->cursg >= qc->n_elem)) {
J
Jeff Garzik 已提交
4658
		/*
4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669
		 * 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 */
4670 4671
			ata_dev_printk(qc->dev, KERN_WARNING,
				       "%u bytes trailing data\n", bytes);
4672 4673

		for (i = 0; i < words; i++)
4674
			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
4675

A
Albert Lee 已提交
4676
		ap->hsm_task_state = HSM_ST_LAST;
4677 4678 4679
		return;
	}

4680
	sg = &qc->__sg[qc->cursg];
L
Linus Torvalds 已提交
4681 4682 4683 4684 4685 4686 4687 4688

	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;

4689
	/* don't overrun current sg */
4690
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
4691 4692 4693 4694

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

4695 4696
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

4697 4698 4699
	if (PageHighMem(page)) {
		unsigned long flags;

4700
		/* FIXME: use bounce buffer */
4701 4702
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4703

4704
		/* do the actual data transfer */
4705
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4706

4707 4708 4709 4710
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4711
		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
4712
	}
L
Linus Torvalds 已提交
4713 4714 4715 4716 4717

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

4718
	if (qc->cursg_ofs == sg->length) {
L
Linus Torvalds 已提交
4719 4720 4721 4722
		qc->cursg++;
		qc->cursg_ofs = 0;
	}

4723
	if (bytes)
L
Linus Torvalds 已提交
4724 4725 4726
		goto next_sg;
}

A
Albert Lee 已提交
4727 4728 4729 4730 4731 4732 4733 4734 4735 4736
/**
 *	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
4737 4738 4739 4740 4741 4742 4743
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;

4744 4745 4746 4747 4748 4749 4750 4751 4752 4753
	/* 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
4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764
	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
4765
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
4766

L
Linus Torvalds 已提交
4767 4768 4769 4770 4771
	__atapi_pio_bytes(qc, bytes);

	return;

err_out:
4772
	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
4773
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
4774
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
4775 4776 4777
}

/**
4778 4779 4780
 *	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
4781
 *
4782 4783
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
4784
 */
4785 4786

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4787
{
4788 4789
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
4790

4791 4792 4793 4794
	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
4795

4796 4797 4798
		if (is_atapi_taskfile(&qc->tf) &&
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
4799 4800
	}

4801 4802
	return 0;
}
L
Linus Torvalds 已提交
4803

T
Tejun Heo 已提交
4804 4805 4806 4807 4808 4809 4810 4811
/**
 *	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
4812
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
4813 4814 4815 4816 4817 4818 4819 4820 4821
 *	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) {
4822
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
4823

J
Jeff Garzik 已提交
4824 4825
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
4826 4827 4828 4829
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
4830
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4831 4832 4833 4834 4835
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

4836
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4837 4838 4839 4840 4841 4842 4843 4844
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
4845
			spin_lock_irqsave(ap->lock, flags);
4846
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
4847
			ata_qc_complete(qc);
4848
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
4849 4850 4851 4852 4853
		} else
			ata_qc_complete(qc);
	}
}

4854 4855 4856 4857 4858 4859 4860 4861 4862 4863
/**
 *	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.
 */
4864 4865
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
4866
{
4867 4868 4869
	unsigned long flags = 0;
	int poll_next;

4870 4871
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

4872 4873 4874 4875
	/* 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).
	 */
4876
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
4877

4878
fsm_start:
4879
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
4880
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
4881

4882 4883
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
4884 4885 4886 4887 4888 4889 4890 4891
		/* 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);

4892
		/* check device status */
4893 4894 4895 4896 4897 4898 4899 4900 4901
		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
4902
			ap->hsm_task_state = HSM_ST_ERR;
4903
			goto fsm_start;
L
Linus Torvalds 已提交
4904 4905
		}

4906 4907
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
4908 4909 4910
		 * 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.
4911 4912
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4913 4914
			ata_port_printk(ap, KERN_WARNING, "DRQ=1 with device "
					"error, dev_stat 0x%X\n", status);
4915
			qc->err_mask |= AC_ERR_HSM;
4916 4917
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
4918
		}
L
Linus Torvalds 已提交
4919

4920 4921 4922 4923 4924 4925
		/* 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)
4926
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
4927

4928 4929 4930 4931
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
4932

4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944
			/* 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)
4945
			spin_unlock_irqrestore(ap->lock, flags);
4946 4947 4948 4949

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
4950
		break;
4951

4952 4953 4954 4955 4956
	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) {
4957 4958 4959
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
4960 4961 4962
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
4963

4964 4965
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
4966 4967 4968
			 * 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.
4969 4970
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
4971 4972 4973
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
4974
				qc->err_mask |= AC_ERR_HSM;
4975 4976
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
4977
			}
L
Linus Torvalds 已提交
4978

4979
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
4980

4981 4982 4983
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
4984

4985 4986 4987 4988
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
4989 4990 4991 4992
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
4993 4994 4995 4996 4997 4998
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
4999

5000 5001 5002
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5003

5004 5005 5006 5007 5008 5009 5010 5011 5012
			/* 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.
5013 5014 5015 5016
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5017 5018 5019 5020 5021 5022 5023

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

5024 5025 5026
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5027 5028 5029 5030 5031 5032
				/* 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;
5033 5034
			}

5035 5036 5037 5038 5039 5040
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
				ata_altstatus(ap);
5041
				status = ata_wait_idle(ap);
5042 5043 5044 5045 5046
				goto fsm_start;
			}
		}

		ata_altstatus(ap); /* flush */
5047
		poll_next = 1;
L
Linus Torvalds 已提交
5048 5049
		break;

A
Albert Lee 已提交
5050
	case HSM_ST_LAST:
5051 5052
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5053 5054 5055 5056 5057
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5058
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5059
			ap->print_id, qc->dev->devno, status);
5060

5061 5062
		WARN_ON(qc->err_mask);

5063
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5064

5065
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5066
		ata_hsm_qc_complete(qc, in_wq);
5067 5068

		poll_next = 0;
L
Linus Torvalds 已提交
5069 5070
		break;

A
Albert Lee 已提交
5071
	case HSM_ST_ERR:
5072 5073 5074 5075 5076 5077
		/* 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;
5078

5079
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5080
		ata_hsm_qc_complete(qc, in_wq);
5081 5082

		poll_next = 0;
5083 5084
		break;
	default:
5085
		poll_next = 0;
5086
		BUG();
L
Linus Torvalds 已提交
5087 5088
	}

5089
	return poll_next;
L
Linus Torvalds 已提交
5090 5091
}

5092
static void ata_pio_task(struct work_struct *work)
5093
{
5094 5095 5096
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5097
	u8 status;
5098
	int poll_next;
5099

J
Jeff Garzik 已提交
5100
fsm_start:
5101
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5102

5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114
	/*
	 * 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) {
5115
			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
5116 5117
			return;
		}
5118 5119
	}

5120 5121
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5122

5123 5124 5125 5126
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5127
		goto fsm_start;
5128 5129
}

L
Linus Torvalds 已提交
5130 5131 5132 5133 5134 5135
/**
 *	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
5136
 *	None.
L
Linus Torvalds 已提交
5137 5138 5139 5140 5141 5142 5143
 */

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

5144
	/* no command while frozen */
5145
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5146 5147
		return NULL;

5148 5149
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5150
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5151
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165
			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
5166
 *	None.
L
Linus Torvalds 已提交
5167 5168
 */

T
Tejun Heo 已提交
5169
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5170
{
T
Tejun Heo 已提交
5171
	struct ata_port *ap = dev->ap;
L
Linus Torvalds 已提交
5172 5173 5174 5175 5176 5177 5178 5179
	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
5180
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193
	}

	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
5194
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5195 5196 5197
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5198 5199 5200
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5201
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5202

5203 5204 5205 5206
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5207
		clear_bit(tag, &ap->qc_allocated);
5208
	}
L
Linus Torvalds 已提交
5209 5210
}

5211
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5212
{
5213 5214
	struct ata_port *ap = qc->ap;

5215 5216
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5217 5218 5219 5220

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

5221
	/* command should be marked inactive atomically with qc completion */
5222 5223 5224 5225
	if (qc->tf.protocol == ATA_PROT_NCQ)
		ap->sactive &= ~(1 << qc->tag);
	else
		ap->active_tag = ATA_TAG_POISON;
5226

5227 5228 5229 5230 5231
	/* 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;
5232
	ap->qc_active &= ~(1 << qc->tag);
5233

L
Linus Torvalds 已提交
5234
	/* call completion callback */
5235
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5236 5237
}

5238 5239 5240 5241 5242
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5243
	ap->ops->tf_read(ap, &qc->result_tf);
5244 5245
}

5246 5247 5248 5249 5250 5251 5252 5253 5254
/**
 *	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
5255
 *	spin_lock_irqsave(host lock)
5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274
 */
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) {
5275
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5276 5277 5278 5279 5280 5281 5282

		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 */
5283
				fill_result_tf(qc);
5284 5285 5286 5287 5288 5289 5290
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5291
			fill_result_tf(qc);
5292 5293 5294 5295 5296 5297 5298 5299

		__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)
5300
			fill_result_tf(qc);
5301 5302 5303 5304 5305

		__ata_qc_complete(qc);
	}
}

5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317
/**
 *	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
5318
 *	spin_lock_irqsave(host lock)
5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354
 *
 *	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
5355 5356 5357 5358 5359
static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	switch (qc->tf.protocol) {
5360
	case ATA_PROT_NCQ:
L
Linus Torvalds 已提交
5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388
	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
5389
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5390
 */
5391
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5392 5393 5394
{
	struct ata_port *ap = qc->ap;

5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408
	/* 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;
	}

5409
	qc->flags |= ATA_QCFLAG_ACTIVE;
5410
	ap->qc_active |= 1 << qc->tag;
5411

L
Linus Torvalds 已提交
5412 5413 5414
	if (ata_should_dma_map(qc)) {
		if (qc->flags & ATA_QCFLAG_SG) {
			if (ata_sg_setup(qc))
5415
				goto sg_err;
L
Linus Torvalds 已提交
5416 5417
		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
			if (ata_sg_setup_one(qc))
5418
				goto sg_err;
L
Linus Torvalds 已提交
5419 5420 5421 5422 5423 5424 5425
		}
	} else {
		qc->flags &= ~ATA_QCFLAG_DMAMAP;
	}

	ap->ops->qc_prep(qc);

5426 5427 5428 5429
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5430

5431 5432
sg_err:
	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5433 5434 5435
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446
}

/**
 *	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
5447 5448
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5449
 *	LOCKING:
J
Jeff Garzik 已提交
5450
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5451 5452
 *
 *	RETURNS:
5453
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5454 5455
 */

5456
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5457 5458 5459
{
	struct ata_port *ap = qc->ap;

5460 5461 5462 5463 5464 5465
	/* 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:
5466
		case ATA_PROT_NODATA:
5467 5468 5469 5470 5471 5472
		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)
5473
				/* see ata_dma_blacklisted() */
5474 5475 5476 5477 5478 5479 5480
				BUG();
			break;
		default:
			break;
		}
	}

5481
	/* select the device */
L
Linus Torvalds 已提交
5482 5483
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5484
	/* start the command */
L
Linus Torvalds 已提交
5485 5486
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5487 5488 5489
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5490
		ata_tf_to_host(ap, &qc->tf);
5491 5492 5493
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5494
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5495

L
Linus Torvalds 已提交
5496 5497 5498
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5499
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5500

L
Linus Torvalds 已提交
5501 5502 5503
		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 */
5504
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5505 5506
		break;

5507 5508 5509
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5510

J
Jeff Garzik 已提交
5511
		ata_tf_to_host(ap, &qc->tf);
5512

5513 5514 5515
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5516
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
5517 5518

			/* always send first data block using
5519
			 * the ata_pio_task() codepath.
5520
			 */
5521
		} else {
5522 5523 5524 5525
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5526
				ata_port_queue_task(ap, ata_pio_task, qc, 0);
5527 5528 5529 5530

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5531 5532
		}

L
Linus Torvalds 已提交
5533 5534 5535 5536
		break;

	case ATA_PROT_ATAPI:
	case ATA_PROT_ATAPI_NODATA:
5537 5538 5539
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5540
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5541

5542 5543 5544 5545 5546
		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))
5547
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5548 5549 5550
		break;

	case ATA_PROT_ATAPI_DMA:
J
Jeff Garzik 已提交
5551
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5552

L
Linus Torvalds 已提交
5553 5554
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5555 5556 5557 5558
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5559
			ata_port_queue_task(ap, ata_pio_task, qc, 0);
L
Linus Torvalds 已提交
5560 5561 5562 5563
		break;

	default:
		WARN_ON(1);
5564
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579
	}

	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
5580
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5581 5582 5583 5584 5585 5586 5587 5588
 *
 *	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)
{
5589
	struct ata_eh_info *ehi = &ap->eh_info;
5590
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5591

5592
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5593
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5594

5595 5596 5597
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5598 5599 5600
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5601

5602 5603 5604 5605 5606
		/* 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
5607 5608
			goto idle_irq;
		break;
5609 5610 5611 5612 5613
	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
5614 5615
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
5616 5617 5618 5619 5620 5621 5622

			/* 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);
5623 5624 5625 5626 5627 5628

			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;
			}
5629 5630 5631 5632
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
5633 5634 5635 5636
	default:
		goto idle_irq;
	}

5637 5638 5639 5640
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
5641

5642 5643 5644 5645
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
5646

5647 5648
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
5649

5650
	ata_hsm_move(ap, qc, status, 0);
5651 5652 5653 5654 5655

	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
5656 5657 5658 5659 5660 5661 5662
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
5663
		ap->ops->irq_ack(ap, 0); /* debug trap */
5664
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
5665
		return 1;
L
Linus Torvalds 已提交
5666 5667 5668 5669 5670 5671 5672
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
5673
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
5674
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
5675
 *
J
Jeff Garzik 已提交
5676 5677 5678
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
5679
 *	LOCKING:
J
Jeff Garzik 已提交
5680
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
5681 5682
 *
 *	RETURNS:
J
Jeff Garzik 已提交
5683
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
5684 5685
 */

5686
irqreturn_t ata_interrupt (int irq, void *dev_instance)
L
Linus Torvalds 已提交
5687
{
J
Jeff Garzik 已提交
5688
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
5689 5690 5691 5692 5693
	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
5694
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
5695

J
Jeff Garzik 已提交
5696
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
5697 5698
		struct ata_port *ap;

J
Jeff Garzik 已提交
5699
		ap = host->ports[i];
5700
		if (ap &&
J
Jeff Garzik 已提交
5701
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
5702 5703 5704
			struct ata_queued_cmd *qc;

			qc = ata_qc_from_tag(ap, ap->active_tag);
5705
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
5706
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
5707 5708 5709 5710
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
5711
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
5712 5713 5714 5715

	return IRQ_RETVAL(handled);
}

5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729
/**
 *	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)
{
5730
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750
}

/**
 *	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)
{
5751 5752
	if (sata_scr_valid(ap))
		return ap->ops->scr_read(ap, reg, val);
5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773
	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)
{
5774 5775
	if (sata_scr_valid(ap))
		return ap->ops->scr_write(ap, reg, val);
5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795
	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)
{
5796 5797
	int rc;

5798
	if (sata_scr_valid(ap)) {
5799 5800 5801 5802
		rc = ap->ops->scr_write(ap, reg, val);
		if (rc == 0)
			rc = ap->ops->scr_read(ap, reg, &val);
		return rc;
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 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851
	}
	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
5852

5853
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
5854
{
5855
	unsigned int err_mask;
J
Jens Axboe 已提交
5856 5857 5858 5859 5860
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

5861
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
5862 5863 5864 5865
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

5866 5867 5868 5869 5870 5871 5872
	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
5873 5874
}

5875
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
5876 5877 5878
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
5879 5880 5881 5882
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
5883 5884
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923

		/* 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
5924 5925
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5926 5927
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
5928
 *	Suspend @host.  Actual operation is performed by EH.  This
5929 5930 5931 5932 5933 5934 5935 5936 5937
 *	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
5938
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5939
{
5940
	int rc;
5941

J
Jeff Garzik 已提交
5942
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
5943 5944
	if (rc == 0)
		host->dev->power.power_state = mesg;
5945 5946 5947 5948
	return rc;
}

/**
J
Jeff Garzik 已提交
5949 5950
 *	ata_host_resume - resume host
 *	@host: host to resume
5951
 *
J
Jeff Garzik 已提交
5952
 *	Resume @host.  Actual operation is performed by EH.  This
5953 5954 5955 5956 5957 5958
 *	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
5959
void ata_host_resume(struct ata_host *host)
5960
{
J
Jeff Garzik 已提交
5961 5962 5963
	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;
5964
}
5965
#endif
5966

5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978
/**
 *	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.
 */
5979
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
5980
{
5981
	struct device *dev = ap->dev;
5982
	int rc;
L
Linus Torvalds 已提交
5983

5984 5985
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
5986 5987 5988
	if (!ap->prd)
		return -ENOMEM;

5989
	rc = ata_pad_alloc(ap, dev);
5990
	if (rc)
5991
		return rc;
L
Linus Torvalds 已提交
5992

5993 5994
	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd,
		(unsigned long long)ap->prd_dma);
L
Linus Torvalds 已提交
5995 5996 5997
	return 0;
}

5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009
/**
 *	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;
6010 6011
	unsigned long flags;

6012 6013
	/* SATA spd limit is bound to the first device */
	ap->sata_spd_limit = ap->hw_sata_spd_limit;
6014
	ap->sata_spd = 0;
6015

6016 6017
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6018
	 * host lock.
6019
	 */
6020
	spin_lock_irqsave(ap->lock, flags);
6021
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6022
	spin_unlock_irqrestore(ap->lock, flags);
6023

6024 6025
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6026 6027 6028 6029 6030
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

L
Linus Torvalds 已提交
6031
/**
6032 6033
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6034
 *
6035 6036 6037 6038
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6039
 *
L
Linus Torvalds 已提交
6040
 *	LOCKING:
6041
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6042
 */
6043
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6044
{
6045
	struct ata_port *ap;
L
Linus Torvalds 已提交
6046 6047
	unsigned int i;

6048 6049 6050 6051 6052 6053
	DPRINTK("ENTER\n");

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

6054
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6055
	ap->lock = &host->lock;
6056
	ap->flags = ATA_FLAG_DISABLED;
6057
	ap->print_id = -1;
L
Linus Torvalds 已提交
6058
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6059
	ap->host = host;
6060 6061
	ap->dev = host->dev;

6062
	ap->hw_sata_spd_limit = UINT_MAX;
L
Linus Torvalds 已提交
6063 6064
	ap->active_tag = ATA_TAG_POISON;
	ap->last_ctl = 0xFF;
6065 6066 6067 6068 6069 6070

#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
6071
#else
6072
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6073
#endif
L
Linus Torvalds 已提交
6074

6075 6076 6077
	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);
6078
	INIT_LIST_HEAD(&ap->eh_done_q);
6079
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6080 6081 6082
	init_timer_deferrable(&ap->fastdrain_timer);
	ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
	ap->fastdrain_timer.data = (unsigned long)ap;
L
Linus Torvalds 已提交
6083

6084 6085
	ap->cbl = ATA_CBL_NONE;

6086 6087
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &ap->device[i];
T
Tejun Heo 已提交
6088
		dev->ap = ap;
6089
		dev->devno = i;
6090
		ata_dev_init(dev);
6091
	}
L
Linus Torvalds 已提交
6092 6093 6094 6095 6096 6097 6098 6099

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

6100 6101 6102 6103 6104 6105 6106 6107
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];

6108 6109 6110 6111
		if (!ap)
			continue;

		if ((host->flags & ATA_HOST_STARTED) && ap->ops->port_stop)
6112 6113 6114
			ap->ops->port_stop(ap);
	}

6115
	if ((host->flags & ATA_HOST_STARTED) && host->ops->host_stop)
6116
		host->ops->host_stop(host);
6117

6118 6119 6120
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6121 6122 6123 6124
		if (!ap)
			continue;

		if (ap->scsi_host)
6125 6126
			scsi_host_put(ap->scsi_host);

6127
		kfree(ap);
6128 6129 6130
		host->ports[i] = NULL;
	}

6131
	dev_set_drvdata(gendev, NULL);
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 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198
/**
 *	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;
}

6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242 6243 6244 6245 6246 6247
/**
 *	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;
}

6248 6249 6250 6251 6252 6253 6254
/**
 *	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
6255 6256
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273
 *
 *	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];

6274 6275 6276
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301
		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;
}

6302
/**
J
Jeff Garzik 已提交
6303 6304 6305 6306 6307
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6308 6309 6310 6311 6312
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6313
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6314 6315
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6316
{
J
Jeff Garzik 已提交
6317 6318 6319 6320
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6321 6322
}

6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364 6365
/**
 *	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;

6366 6367 6368
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382
	/* 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;
6383 6384
			if (spd)
				ap->hw_sata_spd_limit &= (1 << spd) - 1;
6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399
		}
		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",
6400
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429
					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;

6430
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458
			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];

6459
		ata_scsi_scan_host(ap, 1);
6460 6461 6462 6463 6464
	}

	return 0;
}

6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498
/**
 *	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
6499 6500 6501
	/* Used to print device info at probe */
	host->irq = irq;

6502 6503 6504 6505 6506 6507 6508 6509
	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;
}

6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526
/**
 *	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)
6527
		goto skip_eh;
6528 6529

	/* tell EH we're leaving & flush EH */
6530
	spin_lock_irqsave(ap->lock, flags);
6531
	ap->pflags |= ATA_PFLAG_UNLOADING;
6532
	spin_unlock_irqrestore(ap->lock, flags);
6533 6534 6535 6536 6537 6538

	ata_port_wait_eh(ap);

	/* EH is now guaranteed to see UNLOADING, so no new device
	 * will be attached.  Disable all existing devices.
	 */
6539
	spin_lock_irqsave(ap->lock, flags);
6540 6541 6542 6543

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

6544
	spin_unlock_irqrestore(ap->lock, flags);
6545 6546 6547 6548 6549

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
6550
	spin_lock_irqsave(ap->lock, flags);
6551
	ata_port_freeze(ap);	/* won't be thawed */
6552
	spin_unlock_irqrestore(ap->lock, flags);
6553 6554

	ata_port_wait_eh(ap);
6555
	cancel_rearming_delayed_work(&ap->hotplug_task);
6556

6557
 skip_eh:
6558
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6559
	scsi_remove_host(ap->scsi_host);
6560 6561
}

T
Tejun Heo 已提交
6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578
/**
 *	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
6579 6580 6581
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
6582 6583 6584 6585 6586 6587 6588
 *
 *	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
6589
 */
E
Edward Falk 已提交
6590

L
Linus Torvalds 已提交
6591 6592 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604
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
6605

6606 6607
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6608 6609 6610 6611
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6612 6613 6614
 *	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
6615 6616 6617 6618
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6619
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6620 6621
{
	struct device *dev = pci_dev_to_dev(pdev);
J
Jeff Garzik 已提交
6622
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
6623

T
Tejun Heo 已提交
6624
	ata_host_detach(host);
L
Linus Torvalds 已提交
6625 6626 6627
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6628
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659
{
	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
6660

6661
#ifdef CONFIG_PM
6662
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6663 6664
{
	pci_save_state(pdev);
6665
	pci_disable_device(pdev);
6666

6667
	if (mesg.event == PM_EVENT_SUSPEND)
6668
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6669 6670
}

6671
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6672
{
6673 6674
	int rc;

J
Jens Axboe 已提交
6675 6676
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6677

T
Tejun Heo 已提交
6678
	rc = pcim_enable_device(pdev);
6679 6680 6681 6682 6683 6684
	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
6685
	pci_set_master(pdev);
6686
	return 0;
6687 6688
}

6689
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6690
{
J
Jeff Garzik 已提交
6691
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6692 6693
	int rc = 0;

J
Jeff Garzik 已提交
6694
	rc = ata_host_suspend(host, mesg);
6695 6696 6697
	if (rc)
		return rc;

6698
	ata_pci_device_do_suspend(pdev, mesg);
6699 6700 6701 6702 6703 6704

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
6705
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
6706
	int rc;
6707

6708 6709 6710 6711
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6712
}
6713 6714
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6715 6716 6717 6718 6719
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
6720
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
6721 6722 6723 6724
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

6725 6726 6727 6728 6729 6730
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
6731 6732 6733 6734 6735 6736 6737
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
6738
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
6739 6740
}

6741
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6742 6743
module_exit(ata_exit);

6744
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
6745
static DEFINE_SPINLOCK(ata_ratelimit_lock);
6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764

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;
}

6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810
/**
 *	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
6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843
/*
 * 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,
};

6844 6845 6846 6847
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
6848 6849 6850 6851 6852 6853 6854
/*
 * 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.
 */

6855 6856 6857
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
6858
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6859
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
6860 6861
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
6862
EXPORT_SYMBOL_GPL(ata_host_init);
6863
EXPORT_SYMBOL_GPL(ata_host_alloc);
6864
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
6865
EXPORT_SYMBOL_GPL(ata_host_start);
6866
EXPORT_SYMBOL_GPL(ata_host_register);
6867
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6868
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6869 6870
EXPORT_SYMBOL_GPL(ata_sg_init);
EXPORT_SYMBOL_GPL(ata_sg_init_one);
6871
EXPORT_SYMBOL_GPL(ata_hsm_move);
6872
EXPORT_SYMBOL_GPL(ata_qc_complete);
6873
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
6874 6875 6876 6877 6878
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);
6879
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
6880 6881 6882 6883 6884 6885
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);
6886
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
6887
EXPORT_SYMBOL_GPL(ata_interrupt);
6888
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
6889 6890
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
L
Linus Torvalds 已提交
6891
EXPORT_SYMBOL_GPL(ata_qc_prep);
6892
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
6893
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
6894 6895 6896 6897 6898
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);
6899 6900 6901 6902 6903
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
6904
EXPORT_SYMBOL_GPL(ata_port_probe);
6905
EXPORT_SYMBOL_GPL(ata_dev_disable);
6906
EXPORT_SYMBOL_GPL(sata_set_spd);
6907 6908
EXPORT_SYMBOL_GPL(sata_phy_debounce);
EXPORT_SYMBOL_GPL(sata_phy_resume);
L
Linus Torvalds 已提交
6909 6910 6911
EXPORT_SYMBOL_GPL(sata_phy_reset);
EXPORT_SYMBOL_GPL(__sata_phy_reset);
EXPORT_SYMBOL_GPL(ata_bus_reset);
6912
EXPORT_SYMBOL_GPL(ata_std_prereset);
6913
EXPORT_SYMBOL_GPL(ata_std_softreset);
6914
EXPORT_SYMBOL_GPL(sata_port_hardreset);
6915 6916
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
6917 6918
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
6919
EXPORT_SYMBOL_GPL(ata_port_disable);
6920
EXPORT_SYMBOL_GPL(ata_ratelimit);
6921
EXPORT_SYMBOL_GPL(ata_wait_register);
6922
EXPORT_SYMBOL_GPL(ata_busy_sleep);
6923
EXPORT_SYMBOL_GPL(ata_wait_ready);
T
Tejun Heo 已提交
6924
EXPORT_SYMBOL_GPL(ata_port_queue_task);
L
Linus Torvalds 已提交
6925 6926 6927
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6928
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6929
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
6930
EXPORT_SYMBOL_GPL(ata_host_intr);
6931 6932 6933 6934 6935 6936
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);
6937
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6938 6939
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6940
#endif /* CONFIG_PM */
6941 6942
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6943
EXPORT_SYMBOL_GPL(ata_id_to_dma_mode);
L
Linus Torvalds 已提交
6944 6945
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6946
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
A
Alan Cox 已提交
6947 6948 6949
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);

L
Linus Torvalds 已提交
6950 6951
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
6952
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
T
Tejun Heo 已提交
6953
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
6954
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
L
Linus Torvalds 已提交
6955 6956
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6957
#ifdef CONFIG_PM
6958 6959
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6960 6961
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6962
#endif /* CONFIG_PM */
A
Alan Cox 已提交
6963 6964
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
6965
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6966

T
Tejun Heo 已提交
6967 6968 6969
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6970
EXPORT_SYMBOL_GPL(ata_eng_timeout);
6971 6972
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
EXPORT_SYMBOL_GPL(ata_port_abort);
6973 6974 6975
EXPORT_SYMBOL_GPL(ata_port_freeze);
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6976 6977
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
6978
EXPORT_SYMBOL_GPL(ata_do_eh);
6979 6980 6981 6982
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
6983
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
6984 6985 6986 6987 6988

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