libata-core.c 186.7 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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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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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 <linux/io.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/semaphore.h>
#include <asm/byteorder.h>
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#include <linux/cdrom.h>
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#include "libata.h"

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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
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static unsigned int ata_dev_set_feature(struct ata_device *dev,
					u8 enable, u8 feature);
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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 atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (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;
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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 libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
module_param_named(dma, libata_dma_mask, int, 0444);
MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");

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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 = 0;
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module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands");

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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->link->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.
 */
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unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
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{
	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.
 */
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void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
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{
	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[] = {
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	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
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	{ -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:
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 *	Matching XFER_* value, 0xff if no match found.
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 */
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u8 ata_xfer_mask2mode(unsigned long xfer_mask)
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{
	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;
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	return 0xff;
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}

/**
 *	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.
 */
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unsigned long ata_xfer_mode2mask(u8 xfer_mode)
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{
	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)
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			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
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	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.
 */
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int ata_xfer_mode2shift(unsigned long xfer_mode)
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{
	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
578
 *	@mode_mask, or the constant C string "<n/a>".
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 */
580
const char *ata_mode_string(unsigned long xfer_mask)
L
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581
{
582 583 584 585 586 587
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
588 589
		"PIO5",
		"PIO6",
590 591 592
		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
593 594
		"MWDMA3",
		"MWDMA4",
595 596 597 598 599 600 601 602 603
		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
604
	int highbit;
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606 607 608
	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>";
}

612 613 614 615 616 617 618 619 620 621 622 623
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)
625
{
T
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626
	if (ata_dev_enabled(dev)) {
T
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627
		if (ata_msg_drv(dev->link->ap))
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			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
629
		ata_acpi_on_disable(dev);
630 631
		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
					     ATA_DNXFER_QUIET);
632 633 634 635
		dev->class++;
	}
}

636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691
static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
{
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
	u32 scontrol;
	unsigned int err_mask;
	int rc;

	/*
	 * disallow DIPM for drivers which haven't set
	 * ATA_FLAG_IPM.  This is because when DIPM is enabled,
	 * phy ready will be set in the interrupt status on
	 * state changes, which will cause some drivers to
	 * think there are errors - additionally drivers will
	 * need to disable hot plug.
	 */
	if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
		ap->pm_policy = NOT_AVAILABLE;
		return -EINVAL;
	}

	/*
	 * For DIPM, we will only enable it for the
	 * min_power setting.
	 *
	 * Why?  Because Disks are too stupid to know that
	 * If the host rejects a request to go to SLUMBER
	 * they should retry at PARTIAL, and instead it
	 * just would give up.  So, for medium_power to
	 * work at all, we need to only allow HIPM.
	 */
	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
	if (rc)
		return rc;

	switch (policy) {
	case MIN_POWER:
		/* no restrictions on IPM transitions */
		scontrol &= ~(0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

		/* enable DIPM */
		if (dev->flags & ATA_DFLAG_DIPM)
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_DIPM);
		break;
	case MEDIUM_POWER:
		/* allow IPM to PARTIAL */
		scontrol &= ~(0x1 << 8);
		scontrol |= (0x2 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

692 693 694 695 696
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow transitions to SLUMBER, which effectively
		 * disable DIPM if it does not support PARTIAL
		 */
697 698 699 700 701 702 703 704 705
		break;
	case NOT_AVAILABLE:
	case MAX_PERFORMANCE:
		/* disable all IPM transitions */
		scontrol |= (0x3 << 8);
		rc = sata_scr_write(link, SCR_CONTROL, scontrol);
		if (rc)
			return rc;

706 707 708 709 710
		/*
		 * we don't have to disable DIPM since IPM flags
		 * disallow all transitions which effectively
		 * disable DIPM anyway.
		 */
711 712 713 714 715 716 717 718 719 720 721
		break;
	}

	/* FIXME: handle SET FEATURES failure */
	(void) err_mask;

	return 0;
}

/**
 *	ata_dev_enable_pm - enable SATA interface power management
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 *	@dev:  device to enable power management
 *	@policy: the link power management policy
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
 *
 *	Enable SATA Interface power management.  This will enable
 *	Device Interface Power Management (DIPM) for min_power
 * 	policy, and then call driver specific callbacks for
 *	enabling Host Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: -EINVAL if IPM is not supported, 0 otherwise.
 */
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
{
	int rc = 0;
	struct ata_port *ap = dev->link->ap;

	/* set HIPM first, then DIPM */
	if (ap->ops->enable_pm)
		rc = ap->ops->enable_pm(ap, policy);
	if (rc)
		goto enable_pm_out;
	rc = ata_dev_set_dipm(dev, policy);

enable_pm_out:
	if (rc)
		ap->pm_policy = MAX_PERFORMANCE;
	else
		ap->pm_policy = policy;
	return /* rc */;	/* hopefully we can use 'rc' eventually */
}

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#ifdef CONFIG_PM
754 755
/**
 *	ata_dev_disable_pm - disable SATA interface power management
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 *	@dev: device to disable power management
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
 *
 *	Disable SATA Interface power management.  This will disable
 *	Device Interface Power Management (DIPM) without changing
 * 	policy,  call driver specific callbacks for disabling Host
 * 	Initiated Power management.
 *
 *	Locking: Caller.
 *	Returns: void
 */
static void ata_dev_disable_pm(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	ata_dev_set_dipm(dev, MAX_PERFORMANCE);
	if (ap->ops->disable_pm)
		ap->ops->disable_pm(ap);
}
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#endif	/* CONFIG_PM */
775 776 777 778 779 780 781 782 783

void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
	ap->pm_policy = policy;
	ap->link.eh_info.action |= ATA_EHI_LPM;
	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
	ata_port_schedule_eh(ap);
}

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#ifdef CONFIG_PM
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
static void ata_lpm_enable(struct ata_host *host)
{
	struct ata_link *link;
	struct ata_port *ap;
	struct ata_device *dev;
	int i;

	for (i = 0; i < host->n_ports; i++) {
		ap = host->ports[i];
		ata_port_for_each_link(link, ap) {
			ata_link_for_each_dev(dev, link)
				ata_dev_disable_pm(dev);
		}
	}
}

static void ata_lpm_disable(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		ata_lpm_schedule(ap, ap->pm_policy);
	}
}
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810
#endif	/* CONFIG_PM */
811 812


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/**
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 *	ata_devchk - PATA device presence detection
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815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
 *	@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);
L
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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:
868 869
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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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.
876 877 878 879 880 881 882 883 884 885 886 887 888 889
	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
L
Linus Torvalds 已提交
890
	 */
891
	if ((tf->lbam == 0) && (tf->lbah == 0)) {
L
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892 893 894 895
		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

896
	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

901 902 903 904 905 906
	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
		DPRINTK("found PMP device by sig\n");
		return ATA_DEV_PMP;
	}

	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
907
		printk(KERN_INFO "ata: SEMB device ignored\n");
908 909 910
		return ATA_DEV_SEMB_UNSUP; /* not yet */
	}

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911 912 913 914 915 916
	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
 *	ata_dev_try_classify - Parse returned ATA device signature
917 918
 *	@dev: ATA device to classify (starting at zero)
 *	@present: device seems present
919
 *	@r_err: Value of error register on completion
L
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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.
932 933 934
 *
 *	RETURNS:
 *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
L
Linus Torvalds 已提交
935
 */
936 937
unsigned int ata_dev_try_classify(struct ata_device *dev, int present,
				  u8 *r_err)
L
Linus Torvalds 已提交
938
{
939
	struct ata_port *ap = dev->link->ap;
L
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940 941 942 943
	struct ata_taskfile tf;
	unsigned int class;
	u8 err;

944
	ap->ops->dev_select(ap, dev->devno);
L
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945 946 947 948

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

	ap->ops->tf_read(ap, &tf);
949
	err = tf.feature;
950 951
	if (r_err)
		*r_err = err;
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953 954
	/* see if device passed diags: continue and warn later */
	if (err == 0)
955
		/* diagnostic fail : do nothing _YET_ */
956
		dev->horkage |= ATA_HORKAGE_DIAGNOSTIC;
957
	else if (err == 1)
L
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958
		/* do nothing */ ;
959
	else if ((dev->devno == 0) && (err == 0x81))
L
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960 961
		/* do nothing */ ;
	else
962
		return ATA_DEV_NONE;
L
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963

964
	/* determine if device is ATA or ATAPI */
L
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965
	class = ata_dev_classify(&tf);
966

967 968 969 970 971 972 973 974 975 976 977 978 979 980
	if (class == ATA_DEV_UNKNOWN) {
		/* If the device failed diagnostic, it's likely to
		 * have reported incorrect device signature too.
		 * Assume ATA device if the device seems present but
		 * device signature is invalid with diagnostic
		 * failure.
		 */
		if (present && (dev->horkage & ATA_HORKAGE_DIAGNOSTIC))
			class = ATA_DEV_ATA;
		else
			class = ATA_DEV_NONE;
	} else if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
		class = ATA_DEV_NONE;

981
	return class;
L
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982 983 984
}

/**
985
 *	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.
 */

999 1000
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
{
	unsigned int c;

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

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

		ofs++;
		len -= 2;
	}
}

1018
/**
1019
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1020 1021 1022 1023 1024
 *	@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.
 *
1025
 *	This function is identical to ata_id_string except that it
1026 1027 1028 1029 1030 1031
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1032 1033
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1034 1035 1036 1037 1038
{
	unsigned char *p;

	WARN_ON(!(len & 1));

1039
	ata_id_string(id, s, ofs, len - 1);
1040 1041 1042 1043 1044 1045

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
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1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
			return ata_id_u64(id, 100);
		else
			return ata_id_u32(id, 60);
	} else {
		if (ata_id_current_chs_valid(id))
			return ata_id_u32(id, 57);
		else
			return id[1] * id[3] * id[6];
	}
}

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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;
}

/**
1089 1090 1091
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
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 *
1093 1094
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
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1095
 *
1096 1097 1098
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
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1099
 */
1100
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
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1101
{
1102
	unsigned int err_mask;
A
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1103
	struct ata_taskfile tf;
1104
	int lba48 = ata_id_has_lba48(dev->id);
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1105 1106 1107

	ata_tf_init(dev, &tf);

1108
	/* always clear all address registers */
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1109 1110
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1111 1112 1113 1114 1115
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
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1116 1117

	tf.protocol |= ATA_PROT_NODATA;
1118 1119
	tf.device |= ATA_LBA;

1120
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1121 1122 1123 1124 1125 1126 1127
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to read native "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
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1129 1130 1131 1132
	if (lba48)
		*max_sectors = ata_tf_to_lba48(&tf);
	else
		*max_sectors = ata_tf_to_lba(&tf);
1133
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1134
		(*max_sectors)--;
1135
	return 0;
A
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1136 1137 1138
}

/**
1139 1140
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
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 *	@new_sectors: new max sectors value to set for the device
A
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 *
1143 1144 1145 1146 1147 1148
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
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 */
T
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1150
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1151
{
1152
	unsigned int err_mask;
A
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1153
	struct ata_taskfile tf;
1154
	int lba48 = ata_id_has_lba48(dev->id);
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	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1161 1162 1163 1164 1165 1166 1167 1168

	if (lba48) {
		tf.command = ATA_CMD_SET_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
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	} else {
1170 1171
		tf.command = ATA_CMD_SET_MAX;

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1172 1173 1174
		tf.device |= (new_sectors >> 24) & 0xf;
	}

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1175
	tf.protocol |= ATA_PROT_NODATA;
1176
	tf.device |= ATA_LBA;
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1177 1178 1179 1180 1181

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

1182
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	if (err_mask) {
		ata_dev_printk(dev, KERN_WARNING, "failed to set "
			       "max address (err_mask=0x%x)\n", err_mask);
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
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}

/**
 *	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.
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 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
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 */
T
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static int ata_hpa_resize(struct ata_device *dev)
A
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1207
{
T
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	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1212
	int rc;
J
Jeff Garzik 已提交
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1214 1215 1216 1217
	/* do we need to do it? */
	if (dev->class != ATA_DEV_ATA ||
	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1218
		return 0;
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1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
		/* If HPA isn't going to be unlocked, skip HPA
		 * resizing from the next try.
		 */
		if (!ata_ignore_hpa) {
			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
				       "broken, will skip HPA handling\n");
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
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		}
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1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
		return rc;
	}

	/* nothing to do? */
	if (native_sectors <= sectors || !ata_ignore_hpa) {
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
			ata_dev_printk(dev, KERN_INFO,
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
			ata_dev_printk(dev, KERN_WARNING,
				"native sectors (%llu) is smaller than "
				"sectors (%llu)\n",
				(unsigned long long)native_sectors,
				(unsigned long long)sectors);
		return 0;
	}

	/* let's unlock HPA */
	rc = ata_set_max_sectors(dev, native_sectors);
	if (rc == -EACCES) {
		/* if device aborted the command, skip HPA resizing */
		ata_dev_printk(dev, KERN_WARNING, "device aborted resize "
			       "(%llu -> %llu), skipping HPA handling\n",
			       (unsigned long long)sectors,
			       (unsigned long long)native_sectors);
		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
		return 0;
	} else if (rc)
		return rc;

	/* re-read IDENTIFY data */
	rc = ata_dev_reread_id(dev, 0);
	if (rc) {
		ata_dev_printk(dev, KERN_ERR, "failed to re-read IDENTIFY "
			       "data after HPA resizing\n");
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
		ata_dev_printk(dev, KERN_INFO,
			"HPA unlocked: %llu -> %llu, native %llu\n",
			(unsigned long long)sectors,
			(unsigned long long)new_sectors,
			(unsigned long long)native_sectors);
	}

	return 0;
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}

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1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
/**
 *	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.
 */
1303
void ata_noop_dev_select(struct ata_port *ap, unsigned int device)
L
Linus Torvalds 已提交
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{
}

E
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L
Linus Torvalds 已提交
1308 1309 1310 1311 1312 1313 1314
/**
 *	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
E
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 *	ATA channel.  Works with both PIO and MMIO.
 *
 *	May be used as the dev_select() entry in ata_port_operations.
L
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1318 1319 1320 1321 1322
 *
 *	LOCKING:
 *	caller.
 */

1323
void ata_std_dev_select(struct ata_port *ap, unsigned int device)
L
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1324 1325 1326 1327 1328 1329 1330 1331
{
	u8 tmp;

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

T
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1332
	iowrite8(tmp, ap->ioaddr.device_addr);
L
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1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
	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)
{
T
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1358
	if (ata_msg_probe(ap))
T
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1359 1360
		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, "
				"device %u, wait %u\n", device, wait);
L
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	if (wait)
		ata_wait_idle(ap);

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

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

/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1376
 *	@id: IDENTIFY DEVICE page to dump
L
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 *
1378 1379
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
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 *
 *	LOCKING:
 *	caller.
 */

1385
static inline void ata_dump_id(const u16 *id)
L
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{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1392 1393 1394 1395 1396
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
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	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1402 1403 1404 1405 1406
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1407 1408
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1409 1410
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1411 1412
}

1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
/**
 *	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
 */
1428
unsigned long ata_id_xfermask(const u16 *id)
1429
{
1430
	unsigned long pio_mask, mwdma_mask, udma_mask;
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441

	/* 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.
		 */
1442
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1443
		if (mode < 5)	/* Valid PIO range */
1444
			pio_mask = (2 << mode) - 1;
1445 1446
		else
			pio_mask = 1;
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456

		/* 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;
1457

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
	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);
	}

1475 1476 1477
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1478 1479 1480 1481

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

T
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1482
/**
1483
 *	ata_pio_queue_task - Queue port_task
T
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1484
 *	@ap: The ata_port to queue port_task for
1485
 *	@fn: workqueue function to be scheduled
1486
 *	@data: data for @fn to use
1487
 *	@delay: delay time for workqueue function
T
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1488 1489 1490 1491 1492 1493 1494
 *
 *	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
1495
 *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
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1496 1497 1498 1499 1500
 *	synchronization.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
1501 1502
static void ata_pio_queue_task(struct ata_port *ap, void *data,
			       unsigned long delay)
T
Tejun Heo 已提交
1503
{
1504
	ap->port_task_data = data;
T
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1505

1506 1507
	/* may fail if ata_port_flush_task() in progress */
	queue_delayed_work(ata_wq, &ap->port_task, delay);
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1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523
}

/**
 *	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");

1524
	cancel_rearming_delayed_work(&ap->port_task);
T
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1525

1526 1527
	if (ata_msg_ctl(ap))
		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
T
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1528 1529
}

1530
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1531
{
1532
	struct completion *waiting = qc->private_data;
1533 1534 1535 1536 1537

	complete(waiting);
}

/**
1538
 *	ata_exec_internal_sg - execute libata internal command
1539 1540
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1541
 *	@cdb: CDB for packet command
1542
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1543
 *	@sgl: sg list for the data buffer of the command
1544
 *	@n_elem: Number of sg entries
1545
 *	@timeout: Timeout in msecs (0 for default)
1546 1547 1548 1549 1550 1551 1552 1553 1554
 *
 *	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.
1555 1556 1557
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1558
 */
1559 1560
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1561
			      int dma_dir, struct scatterlist *sgl,
1562
			      unsigned int n_elem, unsigned long timeout)
1563
{
T
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1564 1565
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1566 1567
	u8 command = tf->command;
	struct ata_queued_cmd *qc;
1568
	unsigned int tag, preempted_tag;
1569
	u32 preempted_sactive, preempted_qc_active;
1570
	int preempted_nr_active_links;
1571
	DECLARE_COMPLETION_ONSTACK(wait);
1572
	unsigned long flags;
1573
	unsigned int err_mask;
1574
	int rc;
1575

1576
	spin_lock_irqsave(ap->lock, flags);
1577

1578
	/* no internal command while frozen */
1579
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1580
		spin_unlock_irqrestore(ap->lock, flags);
1581 1582 1583
		return AC_ERR_SYSTEM;
	}

1584
	/* initialize internal qc */
1585

1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
	/* 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;

1596
	if (test_and_set_bit(tag, &ap->qc_allocated))
1597
		BUG();
1598
	qc = __ata_qc_from_tag(ap, tag);
1599 1600 1601 1602 1603 1604 1605

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

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1606 1607
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1608
	preempted_qc_active = ap->qc_active;
1609
	preempted_nr_active_links = ap->nr_active_links;
T
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1610 1611
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1612
	ap->qc_active = 0;
1613
	ap->nr_active_links = 0;
1614 1615

	/* prepare & issue qc */
1616
	qc->tf = *tf;
1617 1618
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1619
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1620 1621
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1622
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1623
		struct scatterlist *sg;
1624

J
Jens Axboe 已提交
1625 1626
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1627

J
Jens Axboe 已提交
1628
		ata_sg_init(qc, sgl, n_elem);
1629
		qc->nbytes = buflen;
1630 1631
	}

1632
	qc->private_data = &wait;
1633 1634
	qc->complete_fn = ata_qc_complete_internal;

1635
	ata_qc_issue(qc);
1636

1637
	spin_unlock_irqrestore(ap->lock, flags);
1638

1639 1640 1641 1642
	if (!timeout)
		timeout = ata_probe_timeout * 1000 / HZ;

	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1643 1644

	ata_port_flush_task(ap);
1645

1646
	if (!rc) {
1647
		spin_lock_irqsave(ap->lock, flags);
1648 1649 1650

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1651 1652
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1653
		 */
1654
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1655 1656 1657 1658 1659 1660
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1661

1662 1663
			if (ata_msg_warn(ap))
				ata_dev_printk(dev, KERN_WARNING,
T
Tejun Heo 已提交
1664
					"qc timeout (cmd 0x%x)\n", command);
1665 1666
		}

1667
		spin_unlock_irqrestore(ap->lock, flags);
1668 1669
	}

1670 1671 1672 1673
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

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

1686
	/* finish up */
1687
	spin_lock_irqsave(ap->lock, flags);
1688

1689
	*tf = qc->result_tf;
1690 1691 1692
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1693 1694
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1695
	ap->qc_active = preempted_qc_active;
1696
	ap->nr_active_links = preempted_nr_active_links;
1697

1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
	/* 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.
	 */
1709
	if (ap->flags & ATA_FLAG_DISABLED) {
1710 1711 1712 1713
		err_mask |= AC_ERR_SYSTEM;
		ata_port_probe(ap);
	}

1714
	spin_unlock_irqrestore(ap->lock, flags);
1715

1716
	return err_mask;
1717 1718
}

1719
/**
1720
 *	ata_exec_internal - execute libata internal command
1721 1722 1723 1724 1725 1726
 *	@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
1727
 *	@timeout: Timeout in msecs (0 for default)
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739
 *
 *	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,
1740 1741
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1742
{
1743 1744
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1745

1746 1747 1748 1749 1750 1751
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1752

1753 1754
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1755 1756
}

1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
/**
 *	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
1770
 */
1771
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1772 1773 1774 1775 1776 1777 1778 1779 1780
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1781
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1782 1783
}

1784 1785 1786 1787 1788 1789 1790
/**
 *	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
1791

1792 1793
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
A
Alan Cox 已提交
1794 1795
	/* Controller doesn't support  IORDY. Probably a pointless check
	   as the caller should know this */
T
Tejun Heo 已提交
1796
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1797
		return 0;
A
Alan Cox 已提交
1798 1799 1800 1801 1802
	/* 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))
1803
		return 1;
A
Alan Cox 已提交
1804 1805
	return 0;
}
1806

A
Alan Cox 已提交
1807 1808 1809 1810 1811 1812 1813
/**
 *	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
1814

A
Alan Cox 已提交
1815 1816
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1817 1818
	/* 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
1819
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1820 1821 1822 1823
		/* 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
1824 1825
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1826 1827
		}
	}
A
Alan Cox 已提交
1828
	return 3 << ATA_SHIFT_PIO;
1829 1830
}

L
Linus Torvalds 已提交
1831
/**
1832 1833 1834
 *	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)
1835
 *	@flags: ATA_READID_* flags
1836
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1837
 *
1838 1839
 *	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
1840 1841
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1842
 *
1843
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1844
 *	now we abort if we hit that case.
1845
 *
L
Linus Torvalds 已提交
1846
 *	LOCKING:
1847 1848 1849 1850
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1851
 */
1852
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1853
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1854
{
T
Tejun Heo 已提交
1855
	struct ata_port *ap = dev->link->ap;
1856
	unsigned int class = *p_class;
1857
	struct ata_taskfile tf;
1858 1859
	unsigned int err_mask = 0;
	const char *reason;
1860
	int may_fallback = 1, tried_spinup = 0;
1861
	int rc;
L
Linus Torvalds 已提交
1862

1863
	if (ata_msg_ctl(ap))
T
Tejun Heo 已提交
1864
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
1865

1866 1867
	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
 retry:
T
Tejun Heo 已提交
1868
	ata_tf_init(dev, &tf);
1869

1870 1871
	switch (class) {
	case ATA_DEV_ATA:
1872
		tf.command = ATA_CMD_ID_ATA;
1873 1874
		break;
	case ATA_DEV_ATAPI:
1875
		tf.command = ATA_CMD_ID_ATAPI;
1876 1877 1878 1879 1880
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1881 1882
	}

1883
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893

	/* 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
1894

T
Tejun Heo 已提交
1895
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1896
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1897
	if (err_mask) {
1898
		if (err_mask & AC_ERR_NODEV_HINT) {
1899
			DPRINTK("ata%u.%d: NODEV after polling detection\n",
T
Tejun Heo 已提交
1900
				ap->print_id, dev->devno);
1901 1902 1903
			return -ENOENT;
		}

1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
		/* 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;
		}

1919 1920
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1921 1922 1923
		goto err_out;
	}

1924 1925 1926 1927 1928
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1929
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1930

1931
	/* sanity check */
1932
	rc = -EINVAL;
A
Alan Cox 已提交
1933
	reason = "device reports invalid type";
1934 1935 1936 1937 1938 1939 1940

	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;
1941 1942
	}

1943 1944 1945 1946 1947 1948 1949
	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.
		 */
1950
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1951
		if (err_mask && id[2] != 0x738c) {
1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963
			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;
	}

1964
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
1965 1966 1967
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
1968 1969
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1970 1971
		 * anything else..
		 * Some drives were very specific about that exact sequence.
1972 1973 1974
		 *
		 * Note that ATA4 says lba is mandatory so the second check
		 * shoud never trigger.
1975 1976
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
1977
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1978 1979 1980 1981 1982 1983 1984 1985 1986
			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.
			 */
1987
			flags &= ~ATA_READID_POSTRESET;
1988 1989 1990 1991 1992
			goto retry;
		}
	}

	*p_class = class;
1993

1994 1995 1996
	return 0;

 err_out:
T
Tejun Heo 已提交
1997
	if (ata_msg_warn(ap))
1998
		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
T
Tejun Heo 已提交
1999
			       "(%s, err_mask=0x%x)\n", reason, err_mask);
2000 2001 2002
	return rc;
}

T
Tejun Heo 已提交
2003
static inline u8 ata_dev_knobble(struct ata_device *dev)
2004
{
T
Tejun Heo 已提交
2005 2006
	struct ata_port *ap = dev->link->ap;
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2007 2008
}

2009 2010 2011
static void ata_dev_config_ncq(struct ata_device *dev,
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2012
	struct ata_port *ap = dev->link->ap;
2013 2014 2015 2016 2017 2018
	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
2019
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2020 2021 2022
		snprintf(desc, desc_sz, "NCQ (not used)");
		return;
	}
2023
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2024
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2025 2026 2027 2028 2029 2030 2031 2032 2033
		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);
}

2034
/**
2035 2036 2037 2038 2039
 *	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.
2040 2041
 *
 *	LOCKING:
2042 2043 2044 2045
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2046
 */
2047
int ata_dev_configure(struct ata_device *dev)
2048
{
T
Tejun Heo 已提交
2049 2050
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2051
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2052
	const u16 *id = dev->id;
2053
	unsigned long xfer_mask;
2054
	char revbuf[7];		/* XYZ-99\0 */
2055 2056
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2057
	int rc;
2058

2059
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
T
Tejun Heo 已提交
2060 2061
		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
			       __FUNCTION__);
2062
		return 0;
2063 2064
	}

2065
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2066
		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__);
L
Linus Torvalds 已提交
2067

T
Tejun Heo 已提交
2068 2069 2070
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);

T
Tejun Heo 已提交
2071 2072 2073 2074
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2075

T
Tejun Heo 已提交
2076 2077 2078 2079 2080
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2081
	/* print device capabilities */
2082
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2083 2084 2085
		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",
2086
			       __FUNCTION__,
2087 2088
			       id[49], id[82], id[83], id[84],
			       id[85], id[86], id[87], id[88]);
2089

2090
	/* initialize to-be-configured parameters */
2091
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2092 2093 2094 2095 2096 2097 2098
	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
2099 2100 2101 2102
	/*
	 * common ATA, ATAPI feature tests
	 */

2103
	/* find max transfer mode; for printk only */
2104
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2105

2106 2107
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2108

2109 2110 2111 2112 2113 2114 2115
	/* 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
2116 2117
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2118 2119
		if (ata_id_is_cfa(id)) {
			if (id[162] & 1) /* CPRM may make this media unusable */
T
Tejun Heo 已提交
2120 2121 2122
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
2123
			snprintf(revbuf, 7, "CFA");
2124
		} else {
2125
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2126 2127 2128 2129 2130 2131
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
				ata_dev_printk(dev, KERN_WARNING,
					       "supports DRM functions and may "
					       "not be fully accessable.\n");
		}
2132

2133
		dev->n_sectors = ata_id_n_sectors(id);
2134

2135 2136 2137
		if (dev->id[59] & 0x100)
			dev->multi_count = dev->id[59] & 0xff;

2138
		if (ata_id_has_lba(id)) {
2139
			const char *lba_desc;
2140
			char ncq_desc[20];
2141

2142 2143
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2144
			if (ata_id_has_lba48(id)) {
2145
				dev->flags |= ATA_DFLAG_LBA48;
2146
				lba_desc = "LBA48";
2147 2148 2149 2150

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2151
			}
2152

2153 2154 2155
			/* config NCQ */
			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));

2156
			/* print device info to dmesg */
2157 2158 2159 2160 2161 2162 2163
			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",
2164
					(unsigned long long)dev->n_sectors,
2165 2166
					dev->multi_count, lba_desc, ncq_desc);
			}
2167
		} else {
2168 2169 2170
			/* CHS */

			/* Default translation */
2171 2172 2173
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2174

2175
			if (ata_id_current_chs_valid(id)) {
2176
				/* Current CHS translation is valid. */
2177 2178 2179
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2180 2181 2182
			}

			/* print device info to dmesg */
2183
			if (ata_msg_drv(ap) && print_info) {
T
Tejun Heo 已提交
2184
				ata_dev_printk(dev, KERN_INFO,
2185 2186 2187
					"%s: %s, %s, max %s\n",
					revbuf,	modelbuf, fwrevbuf,
					ata_mode_string(xfer_mask));
J
Jeff Garzik 已提交
2188
				ata_dev_printk(dev, KERN_INFO,
2189 2190 2191 2192 2193
					"%Lu sectors, multi %u, CHS %u/%u/%u\n",
					(unsigned long long)dev->n_sectors,
					dev->multi_count, dev->cylinders,
					dev->heads, dev->sectors);
			}
2194 2195
		}

2196
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2197 2198 2199
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2200
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2201 2202
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2203
		u32 sntf;
2204

2205
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2206
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2207
			if (ata_msg_warn(ap))
T
Tejun Heo 已提交
2208 2209
				ata_dev_printk(dev, KERN_WARNING,
					       "unsupported CDB len\n");
2210
			rc = -EINVAL;
L
Linus Torvalds 已提交
2211 2212
			goto err_out_nosup;
		}
2213
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2214

2215 2216 2217 2218
		/* Enable ATAPI AN if both the host and device have
		 * the support.  If PMP is attached, SNTF is required
		 * to enable ATAPI AN to discern between PHY status
		 * changed notifications and ATAPI ANs.
2219
		 */
2220 2221 2222
		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
		    (!ap->nr_pmp_links ||
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
T
Tejun Heo 已提交
2223 2224
			unsigned int err_mask;

2225
			/* issue SET feature command to turn this on */
2226 2227
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2228
			if (err_mask)
2229
				ata_dev_printk(dev, KERN_ERR,
T
Tejun Heo 已提交
2230 2231 2232
					"failed to enable ATAPI AN "
					"(err_mask=0x%x)\n", err_mask);
			else {
2233
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2234 2235
				atapi_an_string = ", ATAPI AN";
			}
2236 2237
		}

2238
		if (ata_id_cdb_intr(dev->id)) {
2239
			dev->flags |= ATA_DFLAG_CDB_INTR;
2240 2241
			cdb_intr_string = ", CDB intr";
		}
2242

L
Linus Torvalds 已提交
2243
		/* print device info to dmesg */
2244
		if (ata_msg_drv(ap) && print_info)
2245
			ata_dev_printk(dev, KERN_INFO,
T
Tejun Heo 已提交
2246
				       "ATAPI: %s, %s, max %s%s%s\n",
2247
				       modelbuf, fwrevbuf,
T
Tejun Heo 已提交
2248
				       ata_mode_string(xfer_mask),
T
Tejun Heo 已提交
2249
				       cdb_intr_string, atapi_an_string);
L
Linus Torvalds 已提交
2250 2251
	}

2252 2253 2254 2255 2256
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2257 2258 2259 2260 2261 2262 2263
	if (!(dev->horkage & ATA_HORKAGE_IPM)) {
		if (ata_id_has_hipm(dev->id))
			dev->flags |= ATA_DFLAG_HIPM;
		if (ata_id_has_dipm(dev->id))
			dev->flags |= ATA_DFLAG_DIPM;
	}

2264 2265
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2266
	if (ata_dev_knobble(dev)) {
2267
		if (ata_msg_drv(ap) && print_info)
2268 2269
			ata_dev_printk(dev, KERN_INFO,
				       "applying bridge limits\n");
2270
		dev->udma_mask &= ATA_UDMA5;
2271 2272 2273
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2274
	if ((dev->class == ATA_DEV_ATAPI) &&
2275
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2276
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2277 2278
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2279

T
Tejun Heo 已提交
2280
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2281 2282
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2283

2284 2285 2286 2287 2288 2289 2290
	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
		dev->horkage |= ATA_HORKAGE_IPM;

		/* reset link pm_policy for this port to no pm */
		ap->pm_policy = MAX_PERFORMANCE;
	}

2291
	if (ap->ops->dev_config)
2292
		ap->ops->dev_config(dev);
2293

2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
	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. Do this after the dev_config call as some controllers
		   with buggy firmware may want to avoid reporting false device
		   bugs */

		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");
		}
	}

2309 2310 2311
	if (ata_msg_probe(ap))
		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
			__FUNCTION__, ata_chk_status(ap));
2312
	return 0;
L
Linus Torvalds 已提交
2313 2314

err_out_nosup:
2315
	if (ata_msg_probe(ap))
T
Tejun Heo 已提交
2316 2317
		ata_dev_printk(dev, KERN_DEBUG,
			       "%s: EXIT, err\n", __FUNCTION__);
2318
	return rc;
L
Linus Torvalds 已提交
2319 2320
}

A
Alan Cox 已提交
2321
/**
2322
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2323 2324
 *	@ap: port
 *
2325
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2326 2327 2328 2329 2330 2331 2332 2333 2334
 *	detection.
 */

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

/**
2335
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2336 2337
 *	@ap: port
 *
2338
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358
 *	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;
}

T
Tejun Heo 已提交
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370
/**
 *	ata_cable_ignore	-	return ignored PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which don't use cable type to limit
 *	transfer mode.
 */
int ata_cable_ignore(struct ata_port *ap)
{
	return ATA_CBL_PATA_IGN;
}

A
Alan Cox 已提交
2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382
/**
 *	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
2383 2384 2385 2386
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2387 2388 2389 2390
 *	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
2391
 *	LOCKING:
J
Jeff Garzik 已提交
2392
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2393 2394
 *
 *	RETURNS:
2395
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2396 2397
 */

2398
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2399
{
2400
	unsigned int classes[ATA_MAX_DEVICES];
2401
	int tries[ATA_MAX_DEVICES];
2402
	int rc;
2403
	struct ata_device *dev;
L
Linus Torvalds 已提交
2404

2405
	ata_port_probe(ap);
2406

2407 2408
	ata_link_for_each_dev(dev, &ap->link)
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2409 2410

 retry:
T
Tejun Heo 已提交
2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
	ata_link_for_each_dev(dev, &ap->link) {
		/* If we issue an SRST then an ATA drive (not ATAPI)
		 * may change configuration and be in PIO0 timing. If
		 * we do a hard reset (or are coming from power on)
		 * this is true for ATA or ATAPI. Until we've set a
		 * suitable controller mode we should not touch the
		 * bus as we may be talking too fast.
		 */
		dev->pio_mode = XFER_PIO_0;

		/* If the controller has a pio mode setup function
		 * then use it to set the chipset to rights. Don't
		 * touch the DMA setup as that will be dealt with when
		 * configuring devices.
		 */
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}

2430
	/* reset and determine device classes */
2431
	ap->ops->phy_reset(ap);
2432

2433
	ata_link_for_each_dev(dev, &ap->link) {
2434 2435 2436 2437 2438
		if (!(ap->flags & ATA_FLAG_DISABLED) &&
		    dev->class != ATA_DEV_UNKNOWN)
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2439

2440
		dev->class = ATA_DEV_UNKNOWN;
2441
	}
L
Linus Torvalds 已提交
2442

2443
	ata_port_probe(ap);
2444

2445 2446 2447 2448
	/* 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 */

2449 2450 2451
	ata_link_for_each_dev(dev, &ap->link) {
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2452

2453
		if (!ata_dev_enabled(dev))
2454 2455
			continue;

2456 2457
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2458 2459
		if (rc)
			goto fail;
2460 2461
	}

A
Alan Cox 已提交
2462 2463 2464 2465
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

A
Alan Cox 已提交
2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476
	/* We may have SATA bridge glue hiding here irrespective of the
	   reported cable types and sensed types */
	ata_link_for_each_dev(dev, &ap->link) {
		if (!ata_dev_enabled(dev))
			continue;
		/* SATA drives indicate we have a bridge. We don't know which
		   end of the link the bridge is which is a problem */
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;
	}

2477 2478 2479
	/* 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 */

2480
	ata_link_for_each_dev(dev, &ap->link) {
2481 2482
		if (!ata_dev_enabled(dev))
			continue;
2483

T
Tejun Heo 已提交
2484
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2485
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2486
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2487 2488
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2489 2490
	}

2491
	/* configure transfer mode */
2492
	rc = ata_set_mode(&ap->link, &dev);
2493
	if (rc)
2494
		goto fail;
L
Linus Torvalds 已提交
2495

2496 2497
	ata_link_for_each_dev(dev, &ap->link)
		if (ata_dev_enabled(dev))
2498
			return 0;
L
Linus Torvalds 已提交
2499

2500 2501
	/* no device present, disable port */
	ata_port_disable(ap);
2502
	return -ENODEV;
2503 2504

 fail:
2505 2506
	tries[dev->devno]--;

2507 2508
	switch (rc) {
	case -EINVAL:
2509
		/* eeek, something went very wrong, give up */
2510 2511
		tries[dev->devno] = 0;
		break;
2512 2513 2514 2515

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2516
	case -EIO:
2517 2518 2519 2520
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2521
			sata_down_spd_limit(&ap->link);
2522 2523
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2524 2525
	}

2526
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2527
		ata_dev_disable(dev);
2528

2529
	goto retry;
L
Linus Torvalds 已提交
2530 2531 2532
}

/**
J
Jeff Garzik 已提交
2533 2534
 *	ata_port_probe - Mark port as enabled
 *	@ap: Port for which we indicate enablement
L
Linus Torvalds 已提交
2535
 *
J
Jeff Garzik 已提交
2536 2537 2538
 *	Modify @ap data structure such that the system
 *	thinks that the entire port is enabled.
 *
J
Jeff Garzik 已提交
2539
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2540
 *	serialization.
L
Linus Torvalds 已提交
2541 2542 2543 2544
 */

void ata_port_probe(struct ata_port *ap)
{
2545
	ap->flags &= ~ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2546 2547
}

2548 2549
/**
 *	sata_print_link_status - Print SATA link status
2550
 *	@link: SATA link to printk link status about
2551 2552 2553 2554 2555 2556
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2557
void sata_print_link_status(struct ata_link *link)
2558
{
2559
	u32 sstatus, scontrol, tmp;
2560

2561
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2562
		return;
2563
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2564

2565
	if (ata_link_online(link)) {
2566
		tmp = (sstatus >> 4) & 0xf;
2567
		ata_link_printk(link, KERN_INFO,
2568 2569
				"SATA link up %s (SStatus %X SControl %X)\n",
				sata_spd_string(tmp), sstatus, scontrol);
2570
	} else {
2571
		ata_link_printk(link, KERN_INFO,
2572 2573
				"SATA link down (SStatus %X SControl %X)\n",
				sstatus, scontrol);
2574 2575 2576
	}
}

2577 2578 2579 2580 2581 2582 2583
/**
 *	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
 */
2584

T
Tejun Heo 已提交
2585
struct ata_device *ata_dev_pair(struct ata_device *adev)
2586
{
T
Tejun Heo 已提交
2587 2588
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2589
	if (!ata_dev_enabled(pair))
2590 2591 2592 2593
		return NULL;
	return pair;
}

L
Linus Torvalds 已提交
2594
/**
J
Jeff Garzik 已提交
2595 2596
 *	ata_port_disable - Disable port.
 *	@ap: Port to be disabled.
L
Linus Torvalds 已提交
2597
 *
J
Jeff Garzik 已提交
2598 2599 2600 2601 2602
 *	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
2603
 *	LOCKING: host lock, or some other form of
J
Jeff Garzik 已提交
2604
 *	serialization.
L
Linus Torvalds 已提交
2605 2606 2607 2608
 */

void ata_port_disable(struct ata_port *ap)
{
T
Tejun Heo 已提交
2609 2610
	ap->link.device[0].class = ATA_DEV_NONE;
	ap->link.device[1].class = ATA_DEV_NONE;
2611
	ap->flags |= ATA_FLAG_DISABLED;
L
Linus Torvalds 已提交
2612 2613
}

2614
/**
2615
 *	sata_down_spd_limit - adjust SATA spd limit downward
2616
 *	@link: Link to adjust SATA spd limit for
2617
 *
2618
 *	Adjust SATA spd limit of @link downward.  Note that this
2619
 *	function only adjusts the limit.  The change must be applied
2620
 *	using sata_set_spd().
2621 2622 2623 2624 2625 2626 2627
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2628
int sata_down_spd_limit(struct ata_link *link)
2629
{
2630 2631
	u32 sstatus, spd, mask;
	int rc, highbit;
2632

2633
	if (!sata_scr_valid(link))
2634 2635 2636
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2637
	 * If not, use cached value in link->sata_spd.
2638
	 */
2639
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2640 2641 2642
	if (rc == 0)
		spd = (sstatus >> 4) & 0xf;
	else
2643
		spd = link->sata_spd;
2644

2645
	mask = link->sata_spd_limit;
2646 2647
	if (mask <= 1)
		return -EINVAL;
2648 2649

	/* unconditionally mask off the highest bit */
2650 2651 2652
	highbit = fls(mask) - 1;
	mask &= ~(1 << highbit);

2653 2654 2655 2656 2657 2658 2659 2660 2661
	/* 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? */
2662 2663 2664
	if (!mask)
		return -EINVAL;

2665
	link->sata_spd_limit = mask;
2666

2667
	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
2668
			sata_spd_string(fls(mask)));
2669 2670 2671 2672

	return 0;
}

2673
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2674
{
2675 2676
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2677

2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
	limit = link->sata_spd_limit;

	/* Don't configure downstream link faster than upstream link.
	 * It doesn't speed up anything and some PMPs choke on such
	 * configuration.
	 */
	if (!ata_is_host_link(link) && host_link->sata_spd)
		limit &= (1 << host_link->sata_spd) - 1;

	if (limit == UINT_MAX)
		target = 0;
2689
	else
2690
		target = fls(limit);
2691 2692

	spd = (*scontrol >> 4) & 0xf;
2693
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2694

2695
	return spd != target;
2696 2697 2698
}

/**
2699
 *	sata_set_spd_needed - is SATA spd configuration needed
2700
 *	@link: Link in question
2701 2702
 *
 *	Test whether the spd limit in SControl matches
2703
 *	@link->sata_spd_limit.  This function is used to determine
2704 2705 2706 2707 2708 2709 2710 2711 2712
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2713
int sata_set_spd_needed(struct ata_link *link)
2714 2715 2716
{
	u32 scontrol;

2717
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2718
		return 1;
2719

2720
	return __sata_set_spd_needed(link, &scontrol);
2721 2722 2723
}

/**
2724
 *	sata_set_spd - set SATA spd according to spd limit
2725
 *	@link: Link to set SATA spd for
2726
 *
2727
 *	Set SATA spd of @link according to sata_spd_limit.
2728 2729 2730 2731 2732 2733
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2734
 *	changed.  Negative errno if SCR registers are inaccessible.
2735
 */
2736
int sata_set_spd(struct ata_link *link)
2737 2738
{
	u32 scontrol;
2739
	int rc;
2740

2741
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2742
		return rc;
2743

2744
	if (!__sata_set_spd_needed(link, &scontrol))
2745 2746
		return 0;

2747
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2748 2749
		return rc;

2750 2751 2752
	return 1;
}

A
Alan Cox 已提交
2753 2754 2755 2756 2757
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2758
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2759
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2760 2761 2762
 * 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
2763 2764 2765
 */

static const struct ata_timing ata_timing[] = {
2766 2767 2768 2769 2770 2771 2772 2773
/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 100,   0 },
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20,  80,   0 },
A
Alan Cox 已提交
2774

2775 2776 2777
	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
A
Alan Cox 已提交
2778

2779 2780 2781
	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
2782
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
2783
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
A
Alan Cox 已提交
2784 2785

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
2786 2787 2788 2789 2790 2791 2792
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
A
Alan Cox 已提交
2793 2794 2795 2796

	{ 0xFF }
};

2797 2798
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824

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);
}

2825
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2826
{
2827 2828 2829 2830
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2831

2832 2833 2834
	if (xfer_mode == t->mode)
		return t;
	return NULL;
A
Alan Cox 已提交
2835 2836 2837 2838 2839 2840 2841 2842 2843
}

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;

	/*
2844
	 * Find the mode.
2845
	 */
A
Alan Cox 已提交
2846 2847 2848 2849

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

2850 2851
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2852 2853 2854 2855 2856 2857 2858
	/*
	 * 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));
2859
		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
A
Alan Cox 已提交
2860 2861
			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];
2862
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
A
Alan Cox 已提交
2863 2864 2865 2866 2867 2868 2869 2870 2871
			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.
	 */

2872
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
2873 2874

	/*
2875 2876 2877
	 * 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
2878 2879
	 */

2880
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
2881 2882 2883 2884 2885
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
2886
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897
	 */

	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
2898

2899 2900 2901 2902 2903
	/* 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
2904 2905 2906 2907

	return 0;
}

2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958
/**
 *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
 *	@xfer_shift: ATA_SHIFT_* value for transfer type to examine.
 *	@cycle: cycle duration in ns
 *
 *	Return matching xfer mode for @cycle.  The returned mode is of
 *	the transfer type specified by @xfer_shift.  If @cycle is too
 *	slow for @xfer_shift, 0xff is returned.  If @cycle is faster
 *	than the fastest known mode, the fasted mode is returned.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mode, 0xff if no match found.
 */
u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
{
	u8 base_mode = 0xff, last_mode = 0xff;
	const struct ata_xfer_ent *ent;
	const struct ata_timing *t;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (ent->shift == xfer_shift)
			base_mode = ent->base;

	for (t = ata_timing_find_mode(base_mode);
	     t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
		unsigned short this_cycle;

		switch (xfer_shift) {
		case ATA_SHIFT_PIO:
		case ATA_SHIFT_MWDMA:
			this_cycle = t->cycle;
			break;
		case ATA_SHIFT_UDMA:
			this_cycle = t->udma;
			break;
		default:
			return 0xff;
		}

		if (cycle > this_cycle)
			break;

		last_mode = t->mode;
	}

	return last_mode;
}

2959 2960 2961
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
2962
 *	@sel: ATA_DNXFER_* selector
2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
 *
 *	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
 */
2974
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
2975
{
2976
	char buf[32];
2977 2978
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
2979
	int quiet, highbit;
2980

2981 2982
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
2983

2984 2985 2986 2987
	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);
2988

2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040
	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);
	}
3041 3042 3043 3044 3045 3046 3047

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

	return 0;
}

T
Tejun Heo 已提交
3048
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3049
{
T
Tejun Heo 已提交
3050
	struct ata_eh_context *ehc = &dev->link->eh_context;
3051 3052
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3053 3054
	unsigned int err_mask;
	int rc;
L
Linus Torvalds 已提交
3055

3056
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3057 3058 3059
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

T
Tejun Heo 已提交
3060
	err_mask = ata_dev_set_xfermode(dev);
3061

3062 3063 3064 3065 3066 3067 3068 3069 3070 3071
	if (err_mask & ~AC_ERR_DEV)
		goto fail;

	/* revalidate */
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
	if (rc)
		return rc;

3072 3073
	/* Old CFA may refuse this command, which is just fine */
	if (dev->xfer_shift == ATA_SHIFT_PIO && ata_id_is_cfa(dev->id))
3074
		ign_dev_err = 1;
3075

A
Alan Cox 已提交
3076 3077 3078 3079
	/* Some very old devices and some bad newer ones fail any kind of
	   SET_XFERMODE request but support PIO0-2 timings and no IORDY */
	if (dev->xfer_shift == ATA_SHIFT_PIO && !ata_id_has_iordy(dev->id) &&
			dev->pio_mode <= XFER_PIO_2)
3080
		ign_dev_err = 1;
3081

3082 3083
	/* Early MWDMA devices do DMA but don't allow DMA mode setting.
	   Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3084
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3085 3086
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3087
		ign_dev_err = 1;
3088

3089 3090 3091
	/* if the device is actually configured correctly, ignore dev err */
	if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
		ign_dev_err = 1;
L
Linus Torvalds 已提交
3092

3093 3094 3095 3096 3097 3098
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3099

3100 3101
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3102

3103 3104 3105 3106
	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		       dev_err_whine);

3107
	return 0;
3108 3109 3110 3111 3112

 fail:
	ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
		       "(err_mask=0x%x)\n", err_mask);
	return -EIO;
L
Linus Torvalds 已提交
3113 3114 3115
}

/**
3116
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3117
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3118
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3119
 *
3120 3121 3122
 *	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
3123
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3124
 *
L
Linus Torvalds 已提交
3125
 *	LOCKING:
J
Jeff Garzik 已提交
3126
 *	PCI/etc. bus probe sem.
3127 3128 3129
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3130
 */
3131

3132
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3133
{
3134
	struct ata_port *ap = link->ap;
3135
	struct ata_device *dev;
3136
	int rc = 0, used_dma = 0, found = 0;
3137

3138
	/* step 1: calculate xfer_mask */
3139
	ata_link_for_each_dev(dev, link) {
3140
		unsigned long pio_mask, dma_mask;
3141
		unsigned int mode_mask;
3142

3143
		if (!ata_dev_enabled(dev))
3144 3145
			continue;

3146 3147 3148 3149 3150 3151
		mode_mask = ATA_DMA_MASK_ATA;
		if (dev->class == ATA_DEV_ATAPI)
			mode_mask = ATA_DMA_MASK_ATAPI;
		else if (ata_id_is_cfa(dev->id))
			mode_mask = ATA_DMA_MASK_CFA;

T
Tejun Heo 已提交
3152
		ata_dev_xfermask(dev);
L
Linus Torvalds 已提交
3153

3154 3155
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
3156 3157 3158 3159 3160 3161

		if (libata_dma_mask & mode_mask)
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
		else
			dma_mask = 0;

3162 3163
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3164

3165
		found = 1;
3166
		if (dev->dma_mode != 0xff)
3167
			used_dma = 1;
3168
	}
3169
	if (!found)
3170
		goto out;
3171 3172

	/* step 2: always set host PIO timings */
3173
	ata_link_for_each_dev(dev, link) {
3174 3175 3176
		if (!ata_dev_enabled(dev))
			continue;

3177
		if (dev->pio_mode == 0xff) {
3178
			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
3179
			rc = -EINVAL;
3180
			goto out;
3181 3182 3183 3184 3185 3186 3187
		}

		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
3188

3189
	/* step 3: set host DMA timings */
3190
	ata_link_for_each_dev(dev, link) {
3191
		if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
3192 3193 3194 3195 3196 3197 3198
			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
3199 3200

	/* step 4: update devices' xfer mode */
3201
	ata_link_for_each_dev(dev, link) {
A
Alan 已提交
3202
		/* don't update suspended devices' xfer mode */
3203
		if (!ata_dev_enabled(dev))
3204 3205
			continue;

T
Tejun Heo 已提交
3206
		rc = ata_dev_set_mode(dev);
3207
		if (rc)
3208
			goto out;
3209
	}
L
Linus Torvalds 已提交
3210

3211 3212
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3213
	 */
J
Jeff Garzik 已提交
3214
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3215
		ap->host->simplex_claimed = ap;
3216

3217 3218 3219 3220
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3221 3222
}

3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
/**
 *	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
3233
 *	spin_lock_irqsave(host lock)
3234 3235 3236 3237 3238 3239 3240 3241 3242
 */

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
3243 3244 3245 3246 3247 3248
/**
 *	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
3249 3250 3251
 *	Sleep until ATA Status register bit BSY clears,
 *	or a timeout occurs.
 *
3252 3253 3254 3255 3256
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
3257
 */
3258 3259
int ata_busy_sleep(struct ata_port *ap,
		   unsigned long tmout_pat, unsigned long tmout)
L
Linus Torvalds 已提交
3260 3261 3262 3263 3264 3265 3266
{
	unsigned long timer_start, timeout;
	u8 status;

	status = ata_busy_wait(ap, ATA_BUSY, 300);
	timer_start = jiffies;
	timeout = timer_start + tmout_pat;
3267 3268
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3269 3270 3271 3272
		msleep(50);
		status = ata_busy_wait(ap, ATA_BUSY, 3);
	}

3273
	if (status != 0xff && (status & ATA_BUSY))
3274
		ata_port_printk(ap, KERN_WARNING,
3275 3276
				"port is slow to respond, please be patient "
				"(Status 0x%x)\n", status);
L
Linus Torvalds 已提交
3277 3278

	timeout = timer_start + tmout;
3279 3280
	while (status != 0xff && (status & ATA_BUSY) &&
	       time_before(jiffies, timeout)) {
L
Linus Torvalds 已提交
3281 3282 3283 3284
		msleep(50);
		status = ata_chk_status(ap);
	}

3285 3286 3287
	if (status == 0xff)
		return -ENODEV;

L
Linus Torvalds 已提交
3288
	if (status & ATA_BUSY) {
3289
		ata_port_printk(ap, KERN_ERR, "port failed to respond "
3290 3291
				"(%lu secs, Status 0x%x)\n",
				tmout / HZ, status);
3292
		return -EBUSY;
L
Linus Torvalds 已提交
3293 3294 3295 3296 3297
	}

	return 0;
}

3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335
/**
 *	ata_wait_after_reset - wait before checking status after reset
 *	@ap: port containing status register to be polled
 *	@deadline: deadline jiffies for the operation
 *
 *	After reset, we need to pause a while before reading status.
 *	Also, certain combination of controller and device report 0xff
 *	for some duration (e.g. until SATA PHY is up and running)
 *	which is interpreted as empty port in ATA world.  This
 *	function also waits for such devices to get out of 0xff
 *	status.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_wait_after_reset(struct ata_port *ap, unsigned long deadline)
{
	unsigned long until = jiffies + ATA_TMOUT_FF_WAIT;

	if (time_before(until, deadline))
		deadline = until;

	/* 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.
	 *
	 * Old drivers/ide uses the 2mS rule and then waits for ready.
	 */
	msleep(150);

	/* Wait for 0xff to clear.  Some SATA devices take a long time
	 * to clear 0xff after reset.  For example, HHD424020F7SV00
	 * iVDR needs >= 800ms while.  Quantum GoVault needs even more
	 * than that.
3336 3337 3338 3339
	 *
	 * Note that some PATA controllers (pata_ali) explode if
	 * status register is read more than once when there's no
	 * device attached.
3340
	 */
3341 3342 3343
	if (ap->flags & ATA_FLAG_SATA) {
		while (1) {
			u8 status = ata_chk_status(ap);
3344

3345 3346
			if (status != 0xff || time_after(jiffies, deadline))
				return;
3347

3348 3349
			msleep(50);
		}
3350 3351 3352
	}
}

3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377
/**
 *	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;
3378
		if (!ata_link_online(&ap->link) && status == 0xff)
3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396
			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
3397 3398 3399 3400
{
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int dev0 = devmask & (1 << 0);
	unsigned int dev1 = devmask & (1 << 1);
T
Tejun Heo 已提交
3401
	int rc, ret = 0;
L
Linus Torvalds 已提交
3402 3403 3404 3405

	/* if device 0 was found in ata_devchk, wait for its
	 * BSY bit to clear
	 */
3406 3407
	if (dev0) {
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3408 3409 3410 3411 3412
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3413
	}
L
Linus Torvalds 已提交
3414

3415 3416
	/* 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
3417
	 */
3418 3419
	if (dev1) {
		int i;
L
Linus Torvalds 已提交
3420 3421

		ap->ops->dev_select(ap, 1);
3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436

		/* 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 */
		}

3437
		rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3438 3439 3440 3441 3442
		if (rc) {
			if (rc != -ENODEV)
				return rc;
			ret = rc;
		}
3443
	}
L
Linus Torvalds 已提交
3444 3445 3446 3447 3448 3449 3450

	/* 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);
3451

T
Tejun Heo 已提交
3452
	return ret;
L
Linus Torvalds 已提交
3453 3454
}

3455 3456
static int ata_bus_softreset(struct ata_port *ap, unsigned int devmask,
			     unsigned long deadline)
L
Linus Torvalds 已提交
3457 3458 3459
{
	struct ata_ioports *ioaddr = &ap->ioaddr;

T
Tejun Heo 已提交
3460
	DPRINTK("ata%u: bus reset via SRST\n", ap->print_id);
L
Linus Torvalds 已提交
3461 3462

	/* software reset.  causes dev0 to be selected */
T
Tejun Heo 已提交
3463 3464 3465 3466 3467
	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
3468

3469 3470
	/* wait a while before checking status */
	ata_wait_after_reset(ap, deadline);
L
Linus Torvalds 已提交
3471

3472
	/* Before we perform post reset processing we want to see if
3473 3474 3475
	 * the bus shows 0xFF because the odd clown forgets the D7
	 * pulldown resistor.
	 */
3476
	if (ata_chk_status(ap) == 0xFF)
T
Tejun Heo 已提交
3477
		return -ENODEV;
3478

3479
	return ata_bus_post_reset(ap, devmask, deadline);
L
Linus Torvalds 已提交
3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494
}

/**
 *	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
3495
 *	PCI/etc. bus probe sem.
J
Jeff Garzik 已提交
3496
 *	Obtains host lock.
L
Linus Torvalds 已提交
3497 3498
 *
 *	SIDE EFFECTS:
3499
 *	Sets ATA_FLAG_DISABLED if bus reset fails.
L
Linus Torvalds 已提交
3500 3501 3502 3503
 */

void ata_bus_reset(struct ata_port *ap)
{
T
Tejun Heo 已提交
3504
	struct ata_device *device = ap->link.device;
L
Linus Torvalds 已提交
3505 3506 3507
	struct ata_ioports *ioaddr = &ap->ioaddr;
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
	u8 err;
T
Tejun Heo 已提交
3508
	unsigned int dev0, dev1 = 0, devmask = 0;
T
Tejun Heo 已提交
3509
	int rc;
L
Linus Torvalds 已提交
3510

T
Tejun Heo 已提交
3511
	DPRINTK("ENTER, host %u, port %u\n", ap->print_id, ap->port_no);
L
Linus Torvalds 已提交
3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530

	/* 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
3531 3532 3533
	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
3534
			goto err_out;
T
Tejun Heo 已提交
3535
	}
L
Linus Torvalds 已提交
3536 3537 3538 3539

	/*
	 * determine by signature whether we have ATA or ATAPI devices
	 */
3540
	device[0].class = ata_dev_try_classify(&device[0], dev0, &err);
L
Linus Torvalds 已提交
3541
	if ((slave_possible) && (err != 0x81))
3542
		device[1].class = ata_dev_try_classify(&device[1], dev1, &err);
L
Linus Torvalds 已提交
3543 3544

	/* is double-select really necessary? */
T
Tejun Heo 已提交
3545
	if (device[1].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3546
		ap->ops->dev_select(ap, 1);
T
Tejun Heo 已提交
3547
	if (device[0].class != ATA_DEV_NONE)
L
Linus Torvalds 已提交
3548 3549 3550
		ap->ops->dev_select(ap, 0);

	/* if no devices were detected, disable this port */
T
Tejun Heo 已提交
3551 3552
	if ((device[0].class == ATA_DEV_NONE) &&
	    (device[1].class == ATA_DEV_NONE))
L
Linus Torvalds 已提交
3553 3554 3555 3556
		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
3557
		iowrite8(ap->ctl, ioaddr->ctl_addr);
L
Linus Torvalds 已提交
3558 3559 3560 3561 3562 3563
	}

	DPRINTK("EXIT\n");
	return;

err_out:
3564
	ata_port_printk(ap, KERN_ERR, "disabling port\n");
3565
	ata_port_disable(ap);
L
Linus Torvalds 已提交
3566 3567 3568 3569

	DPRINTK("EXIT\n");
}

3570
/**
3571 3572
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3573
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3574
 *	@deadline: deadline jiffies for the operation
3575
 *
3576
*	Make sure SStatus of @link reaches stable state, determined by
3577 3578
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3579 3580
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3581 3582
 *	until timeout then returns 0 if DET is stable at 1.
 *
3583 3584 3585
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3586 3587 3588 3589 3590 3591
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3592 3593
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3594
{
3595
	unsigned long interval_msec = params[0];
3596 3597
	unsigned long duration = msecs_to_jiffies(params[1]);
	unsigned long last_jiffies, t;
3598 3599 3600
	u32 last, cur;
	int rc;

3601 3602 3603 3604
	t = jiffies + msecs_to_jiffies(params[2]);
	if (time_before(t, deadline))
		deadline = t;

3605
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3606 3607 3608 3609 3610 3611 3612 3613
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
		msleep(interval_msec);
3614
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3615 3616 3617 3618 3619
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3620
			if (cur == 1 && time_before(jiffies, deadline))
3621 3622 3623 3624 3625 3626 3627 3628 3629 3630
				continue;
			if (time_after(jiffies, last_jiffies + duration))
				return 0;
			continue;
		}

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

3631 3632 3633
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3634
		if (time_after(jiffies, deadline))
3635
			return -EPIPE;
3636 3637 3638 3639
	}
}

/**
3640 3641
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3642
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3643
 *	@deadline: deadline jiffies for the operation
3644
 *
3645
 *	Resume SATA phy @link and debounce it.
3646 3647 3648 3649 3650 3651 3652
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3653 3654
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3655 3656
{
	u32 scontrol;
3657 3658
	int rc;

3659
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3660
		return rc;
3661

3662
	scontrol = (scontrol & 0x0f0) | 0x300;
3663

3664
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3665
		return rc;
3666

3667 3668 3669 3670
	/* Some PHYs react badly if SStatus is pounded immediately
	 * after resuming.  Delay 200ms before debouncing.
	 */
	msleep(200);
3671

3672
	return sata_link_debounce(link, params, deadline);
3673 3674
}

3675 3676
/**
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3677
 *	@link: ATA link to be reset
3678
 *	@deadline: deadline jiffies for the operation
3679
 *
T
Tejun Heo 已提交
3680
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3681 3682 3683 3684
 *	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.
3685 3686 3687 3688 3689 3690 3691
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3692
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3693
{
T
Tejun Heo 已提交
3694
	struct ata_port *ap = link->ap;
3695
	struct ata_eh_context *ehc = &link->eh_context;
3696
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3697 3698
	int rc;

T
Tejun Heo 已提交
3699
	/* handle link resume */
3700
	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
3701
	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
3702 3703
		ehc->i.action |= ATA_EH_HARDRESET;

3704 3705 3706 3707 3708 3709
	/* Some PMPs don't work with only SRST, force hardreset if PMP
	 * is supported.
	 */
	if (ap->flags & ATA_FLAG_PMP)
		ehc->i.action |= ATA_EH_HARDRESET;

3710 3711 3712 3713
	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3714
	/* if SATA, resume link */
3715
	if (ap->flags & ATA_FLAG_SATA) {
3716
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3717 3718
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
T
Tejun Heo 已提交
3719
			ata_link_printk(link, KERN_WARNING, "failed to resume "
3720 3721 3722 3723 3724 3725
					"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.
	 */
3726
	if (!(link->flags & ATA_LFLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
T
Tejun Heo 已提交
3727
		rc = ata_wait_ready(ap, deadline);
3728
		if (rc && rc != -ENODEV) {
T
Tejun Heo 已提交
3729
			ata_link_printk(link, KERN_WARNING, "device not ready "
T
Tejun Heo 已提交
3730 3731 3732 3733
					"(errno=%d), forcing hardreset\n", rc);
			ehc->i.action |= ATA_EH_HARDRESET;
		}
	}
3734 3735 3736 3737

	return 0;
}

3738 3739
/**
 *	ata_std_softreset - reset host port via ATA SRST
T
Tejun Heo 已提交
3740
 *	@link: ATA link to reset
3741
 *	@classes: resulting classes of attached devices
3742
 *	@deadline: deadline jiffies for the operation
3743
 *
3744
 *	Reset host port using ATA SRST.
3745 3746 3747 3748 3749 3750 3751
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3752
int ata_std_softreset(struct ata_link *link, unsigned int *classes,
3753
		      unsigned long deadline)
3754
{
T
Tejun Heo 已提交
3755
	struct ata_port *ap = link->ap;
3756
	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
3757 3758
	unsigned int devmask = 0;
	int rc;
3759 3760 3761 3762
	u8 err;

	DPRINTK("ENTER\n");

3763
	if (ata_link_offline(link)) {
3764 3765 3766 3767
		classes[0] = ATA_DEV_NONE;
		goto out;
	}

3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778
	/* 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);
3779
	rc = ata_bus_softreset(ap, devmask, deadline);
T
Tejun Heo 已提交
3780
	/* if link is occupied, -ENODEV too is an error */
3781
	if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
T
Tejun Heo 已提交
3782
		ata_link_printk(link, KERN_ERR, "SRST failed (errno=%d)\n", rc);
3783
		return rc;
3784 3785 3786
	}

	/* determine by signature whether we have ATA or ATAPI devices */
3787 3788
	classes[0] = ata_dev_try_classify(&link->device[0],
					  devmask & (1 << 0), &err);
3789
	if (slave_possible && err != 0x81)
3790 3791
		classes[1] = ata_dev_try_classify(&link->device[1],
						  devmask & (1 << 1), &err);
3792

3793
 out:
3794 3795 3796 3797 3798
	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
	return 0;
}

/**
T
Tejun Heo 已提交
3799 3800
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
3801
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3802
 *	@deadline: deadline jiffies for the operation
3803
 *
T
Tejun Heo 已提交
3804
 *	SATA phy-reset @link using DET bits of SControl register.
3805 3806 3807 3808 3809 3810 3811
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3812
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3813
			unsigned long deadline)
3814
{
3815
	u32 scontrol;
3816
	int rc;
3817

3818 3819
	DPRINTK("ENTER\n");

3820
	if (sata_set_spd_needed(link)) {
3821 3822 3823 3824 3825
		/* 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.
		 */
3826
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3827
			goto out;
3828

3829
		scontrol = (scontrol & 0x0f0) | 0x304;
3830

3831
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3832
			goto out;
3833

3834
		sata_set_spd(link);
3835 3836 3837
	}

	/* issue phy wake/reset */
3838
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3839
		goto out;
3840

3841
	scontrol = (scontrol & 0x0f0) | 0x301;
3842

3843
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3844
		goto out;
3845

3846
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3847 3848 3849 3850
	 * 10.4.2 says at least 1 ms.
	 */
	msleep(1);

3851 3852
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3853 3854 3855 3856 3857 3858 3859
 out:
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

/**
 *	sata_std_hardreset - reset host port via SATA phy reset
T
Tejun Heo 已提交
3860
 *	@link: link to reset
3861
 *	@class: resulting class of attached device
3862
 *	@deadline: deadline jiffies for the operation
3863 3864 3865 3866 3867 3868 3869 3870 3871 3872
 *
 *	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.
 */
T
Tejun Heo 已提交
3873
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3874
		       unsigned long deadline)
3875
{
T
Tejun Heo 已提交
3876
	struct ata_port *ap = link->ap;
3877
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3878 3879 3880 3881 3882
	int rc;

	DPRINTK("ENTER\n");

	/* do hardreset */
T
Tejun Heo 已提交
3883
	rc = sata_link_hardreset(link, timing, deadline);
3884
	if (rc) {
T
Tejun Heo 已提交
3885
		ata_link_printk(link, KERN_ERR,
3886 3887 3888
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
	}
3889 3890

	/* TODO: phy layer with polling, timeouts, etc. */
3891
	if (ata_link_offline(link)) {
3892 3893 3894 3895 3896
		*class = ATA_DEV_NONE;
		DPRINTK("EXIT, link offline\n");
		return 0;
	}

3897 3898
	/* wait a while before checking status */
	ata_wait_after_reset(ap, deadline);
3899

3900 3901 3902 3903 3904 3905 3906 3907 3908 3909
	/* If PMP is supported, we have to do follow-up SRST.  Note
	 * that some PMPs don't send D2H Reg FIS after hardreset at
	 * all if the first port is empty.  Wait for it just for a
	 * second and request follow-up SRST.
	 */
	if (ap->flags & ATA_FLAG_PMP) {
		ata_wait_ready(ap, jiffies + HZ);
		return -EAGAIN;
	}

3910
	rc = ata_wait_ready(ap, deadline);
T
Tejun Heo 已提交
3911 3912
	/* link occupied, -ENODEV too is an error */
	if (rc) {
T
Tejun Heo 已提交
3913
		ata_link_printk(link, KERN_ERR,
3914 3915
				"COMRESET failed (errno=%d)\n", rc);
		return rc;
3916 3917
	}

3918 3919
	ap->ops->dev_select(ap, 0);	/* probably unnecessary */

3920
	*class = ata_dev_try_classify(link->device, 1, NULL);
3921 3922 3923 3924 3925 3926 3927

	DPRINTK("EXIT, class=%u\n", *class);
	return 0;
}

/**
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3928
 *	@link: the target ata_link
3929 3930 3931 3932 3933 3934 3935 3936 3937
 *	@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)
 */
T
Tejun Heo 已提交
3938
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3939
{
T
Tejun Heo 已提交
3940
	struct ata_port *ap = link->ap;
3941 3942
	u32 serror;

3943 3944 3945
	DPRINTK("ENTER\n");

	/* print link status */
3946
	sata_print_link_status(link);
3947

3948
	/* clear SError */
3949 3950
	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
		sata_scr_write(link, SCR_ERROR, serror);
3951
	link->eh_info.serror = 0;
3952

3953 3954 3955 3956 3957 3958
	/* 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);

3959 3960 3961 3962 3963 3964 3965
	/* 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
3966 3967
	if (ap->ioaddr.ctl_addr)
		iowrite8(ap->ctl, ap->ioaddr.ctl_addr);
3968 3969 3970 3971

	DPRINTK("EXIT\n");
}

3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987
/**
 *	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
3988 3989
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3990 3991
{
	const u16 *old_id = dev->id;
3992 3993
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3994 3995

	if (dev->class != new_class) {
3996 3997
		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
			       dev->class, new_class);
3998 3999 4000
		return 0;
	}

4001 4002 4003 4004
	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]));
4005 4006

	if (strcmp(model[0], model[1])) {
4007 4008
		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
			       "'%s' != '%s'\n", model[0], model[1]);
4009 4010 4011 4012
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
4013 4014
		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
			       "'%s' != '%s'\n", serial[0], serial[1]);
4015 4016 4017 4018 4019 4020 4021
		return 0;
	}

	return 1;
}

/**
4022
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
4023
 *	@dev: target ATA device
4024
 *	@readid_flags: read ID flags
4025 4026 4027 4028 4029 4030 4031 4032 4033 4034
 *
 *	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
 */
4035
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4036
{
4037
	unsigned int class = dev->class;
T
Tejun Heo 已提交
4038
	u16 *id = (void *)dev->link->ap->sector_buf;
4039 4040
	int rc;

4041
	/* read ID data */
4042
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4043
	if (rc)
4044
		return rc;
4045 4046

	/* is the device still there? */
4047 4048
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
4049

4050
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4051 4052 4053 4054 4055 4056
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4057
 *	@new_class: new class code
4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068
 *	@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
 */
4069 4070
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4071
{
4072
	u64 n_sectors = dev->n_sectors;
4073 4074 4075 4076 4077
	int rc;

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

4078 4079 4080 4081 4082 4083 4084 4085 4086
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
	    new_class != ATA_DEV_ATA && new_class != ATA_DEV_ATAPI) {
		ata_dev_printk(dev, KERN_INFO, "class mismatch %u != %u\n",
			       dev->class, new_class);
		rc = -ENODEV;
		goto fail;
	}

4087 4088 4089 4090
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4091 4092

	/* configure device according to the new ID */
4093
	rc = ata_dev_configure(dev);
4094 4095 4096 4097
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4098 4099
	if (dev->class == ATA_DEV_ATA && n_sectors &&
	    dev->n_sectors != n_sectors) {
4100 4101 4102 4103
		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
			       "%llu != %llu\n",
			       (unsigned long long)n_sectors,
			       (unsigned long long)dev->n_sectors);
4104 4105 4106 4107

		/* restore original n_sectors */
		dev->n_sectors = n_sectors;

4108 4109 4110 4111 4112
		rc = -ENODEV;
		goto fail;
	}

	return 0;
4113 4114

 fail:
4115
	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
4116 4117 4118
	return rc;
}

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
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 },
4155
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4156
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4157 4158 4159
	/* Odd clown on sil3726/4726 PMPs */
	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
						ATA_HORKAGE_SKIP_PM },
4160

4161
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4162
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4163

4164 4165 4166 4167
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4168
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4169
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4170 4171
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4172
	/* NCQ is broken */
4173
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4174
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4175
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4176
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4177

4178 4179 4180 4181 4182
	/* 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, },
4183

4184 4185 4186 4187 4188
	/* devices which puke on READ_NATIVE_MAX */
	{ "HDS724040KLSA80",	"KFAOA20N",	ATA_HORKAGE_BROKEN_HPA, },
	{ "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
	{ "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
	{ "MAXTOR 6L080L4",	"A93.0500",	ATA_HORKAGE_BROKEN_HPA },
4189

4190 4191 4192
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4193
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4194

A
Alan Cox 已提交
4195 4196 4197
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
P
Peter Missel 已提交
4198 4199 4200
	{ "TSSTcorp CDDVDW SH-S202J", "SB01",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB00",	  ATA_HORKAGE_IVB, },
	{ "TSSTcorp CDDVDW SH-S202N", "SB01",	  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4201

4202 4203
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4204
};
4205

4206
static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
4207 4208 4209 4210 4211 4212 4213 4214 4215 4216
{
	const char *p;
	int len;

	/*
	 * check for trailing wildcard: *\0
	 */
	p = strchr(patt, wildchar);
	if (p && ((*(p + 1)) == 0))
		len = p - patt;
4217
	else {
4218
		len = strlen(name);
4219 4220 4221 4222 4223 4224
		if (!len) {
			if (!*patt)
				return 0;
			return -1;
		}
	}
4225 4226 4227 4228

	return strncmp(patt, name, len);
}

T
Tejun Heo 已提交
4229
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4230
{
T
Tejun Heo 已提交
4231 4232
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4233
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4234

T
Tejun Heo 已提交
4235 4236
	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
4237

4238
	while (ad->model_num) {
4239
		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
4240 4241
			if (ad->model_rev == NULL)
				return ad->horkage;
4242
			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
4243
				return ad->horkage;
4244
		}
4245
		ad++;
4246
	}
L
Linus Torvalds 已提交
4247 4248 4249
	return 0;
}

4250 4251 4252 4253 4254 4255
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.
	 */
T
Tejun Heo 已提交
4256
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4257 4258
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4259
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4260 4261
}

A
Alan Cox 已提交
4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276
/**
 *	ata_is_40wire		-	check drive side detection
 *	@dev: device
 *
 *	Perform drive side detection decoding, allowing for device vendors
 *	who can't follow the documentation.
 */

static int ata_is_40wire(struct ata_device *dev)
{
	if (dev->horkage & ATA_HORKAGE_IVB)
		return ata_drive_40wire_relaxed(dev->id);
	return ata_drive_40wire(dev->id);
}

4277 4278 4279 4280
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4281 4282 4283 4284
 *	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...
4285 4286 4287 4288
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4289
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4290
{
T
Tejun Heo 已提交
4291 4292
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4293
	struct ata_host *host = ap->host;
4294
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4295

4296
	/* controller modes available */
4297 4298 4299
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4300
	/* drive modes available */
4301 4302 4303
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4304

4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315
	/*
	 *	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));
	}

4316 4317
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4318 4319
		ata_dev_printk(dev, KERN_WARNING,
			       "device is on DMA blacklist, disabling DMA\n");
4320
	}
4321

4322
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4323
	    host->simplex_claimed && host->simplex_claimed != ap) {
4324 4325 4326
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
			       "other device, disabling DMA\n");
4327
	}
4328

J
Jeff Garzik 已提交
4329 4330 4331
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4332
	if (ap->ops->mode_filter)
4333
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4334

4335 4336 4337 4338 4339 4340 4341 4342 4343 4344
	/* 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 */
4345
		if ((ap->cbl == ATA_CBL_PATA40) ||
A
Alan Cox 已提交
4346
		    (ata_is_40wire(dev) &&
4347 4348 4349
		    (ap->cbl == ATA_CBL_PATA_UNK ||
		     ap->cbl == ATA_CBL_PATA80))) {
			ata_dev_printk(dev, KERN_WARNING,
4350 4351 4352 4353
				 "limited to UDMA/33 due to 40-wire cable\n");
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4354 4355
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4356 4357 4358 4359 4360 4361
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4362 4363 4364
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4365
 *	LOCKING:
J
Jeff Garzik 已提交
4366
 *	PCI/etc. bus probe sem.
4367 4368 4369
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4370 4371
 */

T
Tejun Heo 已提交
4372
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4373
{
4374
	struct ata_taskfile tf;
4375
	unsigned int err_mask;
L
Linus Torvalds 已提交
4376 4377 4378 4379

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

T
Tejun Heo 已提交
4380 4381 4382
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4383
	ata_tf_init(dev, &tf);
4384 4385
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4386
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4387
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4388
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4389 4390
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4391 4392
	/* If the device has IORDY and the controller does not - turn it off */
 	else if (ata_id_has_iordy(dev->id))
J
Jeff Garzik 已提交
4393
		tf.nsect = 0x01;
A
Alan Cox 已提交
4394 4395
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4396

4397
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4398 4399 4400 4401 4402

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
/**
4403
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4404 4405
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4406
 *	@feature: The sector count represents the feature to set
4407 4408
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4409
 *	on port @ap with sector count
4410 4411 4412 4413 4414 4415 4416
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4417 4418
static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
					u8 feature)
4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430
{
	struct ata_taskfile tf;
	unsigned int err_mask;

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

	ata_tf_init(dev, &tf);
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = enable;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
4431
	tf.nsect = feature;
4432

4433
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4434

4435 4436
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4437 4438
}

4439 4440 4441
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4442 4443
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4444 4445
 *
 *	LOCKING:
4446 4447 4448 4449
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4450
 */
T
Tejun Heo 已提交
4451 4452
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4453
{
4454
	struct ata_taskfile tf;
4455
	unsigned int err_mask;
4456 4457 4458

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4459
		return AC_ERR_INVALID;
4460 4461 4462 4463

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

T
Tejun Heo 已提交
4464
	ata_tf_init(dev, &tf);
4465 4466 4467 4468 4469
	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 */
4470

4471
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4472 4473 4474 4475 4476
	/* A clean abort indicates an original or just out of spec drive
	   and we should continue as we issue the setup based on the
	   drive reported working geometry */
	if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
		err_mask = 0;
4477

4478 4479
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4480 4481
}

L
Linus Torvalds 已提交
4482
/**
J
Jeff Garzik 已提交
4483 4484 4485 4486
 *	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
4487 4488
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4489
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4490
 */
4491
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4492 4493
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4494
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4495 4496
	int dir = qc->dma_dir;

4497
	WARN_ON(sg == NULL);
L
Linus Torvalds 已提交
4498

4499
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4500

4501 4502
	if (qc->n_elem)
		dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
L
Linus Torvalds 已提交
4503 4504

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4505
	qc->sg = NULL;
L
Linus Torvalds 已提交
4506 4507 4508 4509 4510 4511
}

/**
 *	ata_fill_sg - Fill PCI IDE PRD table
 *	@qc: Metadata associated with taskfile to be transferred
 *
J
Jeff Garzik 已提交
4512 4513 4514
 *	Fill PCI IDE PRD (scatter-gather) table with segments
 *	associated with the current disk command.
 *
L
Linus Torvalds 已提交
4515
 *	LOCKING:
J
Jeff Garzik 已提交
4516
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4517 4518 4519 4520 4521
 *
 */
static void ata_fill_sg(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4522
	struct scatterlist *sg;
T
Tejun Heo 已提交
4523
	unsigned int si, pi;
L
Linus Torvalds 已提交
4524

T
Tejun Heo 已提交
4525 4526
	pi = 0;
	for_each_sg(qc->sg, sg, qc->n_elem, si) {
L
Linus Torvalds 已提交
4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542
		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;

T
Tejun Heo 已提交
4543 4544 4545
			ap->prd[pi].addr = cpu_to_le32(addr);
			ap->prd[pi].flags_len = cpu_to_le32(len & 0xffff);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", pi, addr, len);
L
Linus Torvalds 已提交
4546

T
Tejun Heo 已提交
4547
			pi++;
L
Linus Torvalds 已提交
4548 4549 4550 4551 4552
			sg_len -= len;
			addr += len;
		}
	}

T
Tejun Heo 已提交
4553
	ap->prd[pi - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
L
Linus Torvalds 已提交
4554
}
4555

4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572
/**
 *	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;
T
Tejun Heo 已提交
4573
	unsigned int si, pi;
4574

T
Tejun Heo 已提交
4575 4576
	pi = 0;
	for_each_sg(qc->sg, sg, qc->n_elem, si) {
4577 4578 4579
		u32 addr, offset;
		u32 sg_len, len, blen;

4580
		/* determine if physical DMA addr spans 64K boundary.
4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593
		 * 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;
T
Tejun Heo 已提交
4594
			ap->prd[pi].addr = cpu_to_le32(addr);
4595 4596 4597
			if (blen == 0) {
			   /* Some PATA chipsets like the CS5530 can't
			      cope with 0x0000 meaning 64K as the spec says */
T
Tejun Heo 已提交
4598
				ap->prd[pi].flags_len = cpu_to_le32(0x8000);
4599
				blen = 0x8000;
T
Tejun Heo 已提交
4600
				ap->prd[++pi].addr = cpu_to_le32(addr + 0x8000);
4601
			}
T
Tejun Heo 已提交
4602 4603
			ap->prd[pi].flags_len = cpu_to_le32(blen);
			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", pi, addr, len);
4604

T
Tejun Heo 已提交
4605
			pi++;
4606 4607 4608 4609 4610
			sg_len -= len;
			addr += len;
		}
	}

T
Tejun Heo 已提交
4611
	ap->prd[pi - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
4612 4613
}

L
Linus Torvalds 已提交
4614 4615 4616 4617
/**
 *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4618 4619 4620 4621
 *	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
4622
 *	LOCKING:
J
Jeff Garzik 已提交
4623
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4624
 *
L
Linus Torvalds 已提交
4625 4626 4627 4628 4629 4630
 *	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;
4631 4632 4633 4634 4635 4636

	/* 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;
4637

L
Linus Torvalds 已提交
4638
	if (ap->ops->check_atapi_dma)
4639
		return ap->ops->check_atapi_dma(qc);
L
Linus Torvalds 已提交
4640

4641
	return 0;
L
Linus Torvalds 已提交
4642
}
4643

4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673
/**
 *	ata_std_qc_defer - Check whether a qc needs to be deferred
 *	@qc: ATA command in question
 *
 *	Non-NCQ commands cannot run with any other command, NCQ or
 *	not.  As upper layer only knows the queue depth, we are
 *	responsible for maintaining exclusion.  This function checks
 *	whether a new command @qc can be issued.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	ATA_DEFER_* if deferring is needed, 0 otherwise.
 */
int ata_std_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_link *link = qc->dev->link;

	if (qc->tf.protocol == ATA_PROT_NCQ) {
		if (!ata_tag_valid(link->active_tag))
			return 0;
	} else {
		if (!ata_tag_valid(link->active_tag) && !link->sactive)
			return 0;
	}

	return ATA_DEFER_LINK;
}

L
Linus Torvalds 已提交
4674 4675 4676 4677
/**
 *	ata_qc_prep - Prepare taskfile for submission
 *	@qc: Metadata associated with taskfile to be prepared
 *
J
Jeff Garzik 已提交
4678 4679
 *	Prepare ATA taskfile for submission.
 *
L
Linus Torvalds 已提交
4680
 *	LOCKING:
J
Jeff Garzik 已提交
4681
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4682 4683 4684 4685 4686 4687 4688 4689 4690
 */
void ata_qc_prep(struct ata_queued_cmd *qc)
{
	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	ata_fill_sg(qc);
}

4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707
/**
 *	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);
}

4708 4709
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }

J
Jeff Garzik 已提交
4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720
/**
 *	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
4721
 *	spin_lock_irqsave(host lock)
J
Jeff Garzik 已提交
4722
 */
L
Linus Torvalds 已提交
4723 4724 4725
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
T
Tejun Heo 已提交
4726
	qc->sg = sg;
L
Linus Torvalds 已提交
4727
	qc->n_elem = n_elem;
T
Tejun Heo 已提交
4728
	qc->cursg = qc->sg;
L
Linus Torvalds 已提交
4729 4730
}

T
Tejun Heo 已提交
4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746
/**
 *	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.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	Zero on success, negative on error.
 *
 */
static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
4747
	unsigned int n_elem;
T
Tejun Heo 已提交
4748 4749 4750

	VPRINTK("ENTER, ata%u\n", ap->print_id);

4751 4752 4753
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
T
Tejun Heo 已提交
4754

4755
	DPRINTK("%d sg elements mapped\n", n_elem);
L
Linus Torvalds 已提交
4756

4757
	qc->n_elem = n_elem;
4758
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4759 4760 4761 4762

	return 0;
}

E
Edward Falk 已提交
4763
/**
4764
 *	swap_buf_le16 - swap halves of 16-bit words in place
E
Edward Falk 已提交
4765 4766 4767 4768 4769 4770 4771 4772
 *	@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
4773
 *	Inherited from caller.
E
Edward Falk 已提交
4774
 */
L
Linus Torvalds 已提交
4775 4776 4777 4778 4779 4780 4781 4782 4783 4784
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
4785
/**
T
Tejun Heo 已提交
4786
 *	ata_data_xfer - Transfer data by PIO
4787
 *	@dev: device to target
A
Albert Lee 已提交
4788 4789
 *	@buf: data buffer
 *	@buflen: buffer length
4790
 *	@rw: read/write
A
Albert Lee 已提交
4791 4792 4793 4794 4795
 *
 *	Transfer data from/to the device data register by PIO.
 *
 *	LOCKING:
 *	Inherited from caller.
4796 4797 4798
 *
 *	RETURNS:
 *	Bytes consumed.
A
Albert Lee 已提交
4799
 */
4800 4801
unsigned int ata_data_xfer(struct ata_device *dev, unsigned char *buf,
			   unsigned int buflen, int rw)
L
Linus Torvalds 已提交
4802
{
4803 4804
	struct ata_port *ap = dev->link->ap;
	void __iomem *data_addr = ap->ioaddr.data_addr;
A
Albert Lee 已提交
4805
	unsigned int words = buflen >> 1;
L
Linus Torvalds 已提交
4806

A
Albert Lee 已提交
4807
	/* Transfer multiple of 2 bytes */
4808 4809
	if (rw == READ)
		ioread16_rep(data_addr, buf, words);
L
Linus Torvalds 已提交
4810
	else
4811
		iowrite16_rep(data_addr, buf, words);
A
Albert Lee 已提交
4812 4813 4814

	/* Transfer trailing 1 byte, if any. */
	if (unlikely(buflen & 0x01)) {
A
Al Viro 已提交
4815
		__le16 align_buf[1] = { 0 };
A
Albert Lee 已提交
4816 4817
		unsigned char *trailing_buf = buf + buflen - 1;

4818 4819
		if (rw == READ) {
			align_buf[0] = cpu_to_le16(ioread16(data_addr));
A
Albert Lee 已提交
4820
			memcpy(trailing_buf, align_buf, 1);
4821 4822 4823
		} else {
			memcpy(align_buf, trailing_buf, 1);
			iowrite16(le16_to_cpu(align_buf[0]), data_addr);
A
Albert Lee 已提交
4824
		}
4825
		words++;
A
Albert Lee 已提交
4826
	}
4827 4828

	return words << 1;
L
Linus Torvalds 已提交
4829 4830
}

4831
/**
T
Tejun Heo 已提交
4832
 *	ata_data_xfer_noirq - Transfer data by PIO
4833
 *	@dev: device to target
4834 4835
 *	@buf: data buffer
 *	@buflen: buffer length
4836
 *	@rw: read/write
4837
 *
T
Tejun Heo 已提交
4838
 *	Transfer data from/to the device data register by PIO. Do the
4839 4840 4841 4842
 *	transfer with interrupts disabled.
 *
 *	LOCKING:
 *	Inherited from caller.
4843 4844 4845
 *
 *	RETURNS:
 *	Bytes consumed.
4846
 */
4847 4848
unsigned int ata_data_xfer_noirq(struct ata_device *dev, unsigned char *buf,
				 unsigned int buflen, int rw)
4849 4850
{
	unsigned long flags;
4851 4852
	unsigned int consumed;

4853
	local_irq_save(flags);
4854
	consumed = ata_data_xfer(dev, buf, buflen, rw);
4855
	local_irq_restore(flags);
4856 4857

	return consumed;
4858 4859 4860
}


A
Albert Lee 已提交
4861
/**
4862
 *	ata_pio_sector - Transfer a sector of data.
A
Albert Lee 已提交
4863 4864
 *	@qc: Command on going
 *
4865
 *	Transfer qc->sect_size bytes of data from/to the ATA device.
A
Albert Lee 已提交
4866 4867 4868 4869 4870
 *
 *	LOCKING:
 *	Inherited from caller.
 */

L
Linus Torvalds 已提交
4871 4872 4873 4874 4875 4876 4877 4878
static void ata_pio_sector(struct ata_queued_cmd *qc)
{
	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
	struct ata_port *ap = qc->ap;
	struct page *page;
	unsigned int offset;
	unsigned char *buf;

4879
	if (qc->curbytes == qc->nbytes - qc->sect_size)
A
Albert Lee 已提交
4880
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
4881

J
Jens Axboe 已提交
4882
	page = sg_page(qc->cursg);
J
Jens Axboe 已提交
4883
	offset = qc->cursg->offset + qc->cursg_ofs;
L
Linus Torvalds 已提交
4884 4885 4886 4887 4888 4889 4890

	/* 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");

4891 4892 4893
	if (PageHighMem(page)) {
		unsigned long flags;

4894
		/* FIXME: use a bounce buffer */
4895 4896
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
4897

4898
		/* do the actual data transfer */
4899
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
L
Linus Torvalds 已提交
4900

4901 4902 4903 4904
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
4905
		ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
4906
	}
L
Linus Torvalds 已提交
4907

4908 4909
	qc->curbytes += qc->sect_size;
	qc->cursg_ofs += qc->sect_size;
L
Linus Torvalds 已提交
4910

J
Jens Axboe 已提交
4911 4912
	if (qc->cursg_ofs == qc->cursg->length) {
		qc->cursg = sg_next(qc->cursg);
L
Linus Torvalds 已提交
4913 4914 4915 4916
		qc->cursg_ofs = 0;
	}
}

4917
/**
4918
 *	ata_pio_sectors - Transfer one or many sectors.
4919 4920
 *	@qc: Command on going
 *
4921
 *	Transfer one or many sectors of data from/to the
4922 4923 4924 4925 4926
 *	ATA device for the DRQ request.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
L
Linus Torvalds 已提交
4927

4928 4929 4930 4931 4932 4933
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
4934
		WARN_ON(qc->dev->multi_count == 0);
L
Linus Torvalds 已提交
4935

4936
		nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size,
T
Tejun Heo 已提交
4937
			    qc->dev->multi_count);
4938 4939 4940 4941
		while (nsect--)
			ata_pio_sector(qc);
	} else
		ata_pio_sector(qc);
4942 4943

	ata_altstatus(qc->ap); /* flush */
4944 4945
}

4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961
/**
 *	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");
4962
	WARN_ON(qc->dev->cdb_len < 12);
4963

4964
	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
4965 4966 4967
	ata_altstatus(ap); /* flush */

	switch (qc->tf.protocol) {
4968
	case ATAPI_PROT_PIO:
4969 4970
		ap->hsm_task_state = HSM_ST;
		break;
4971
	case ATAPI_PROT_NODATA:
4972 4973
		ap->hsm_task_state = HSM_ST_LAST;
		break;
4974
	case ATAPI_PROT_DMA:
4975 4976 4977 4978 4979
		ap->hsm_task_state = HSM_ST_LAST;
		/* initiate bmdma */
		ap->ops->bmdma_start(qc);
		break;
	}
L
Linus Torvalds 已提交
4980 4981
}

A
Albert Lee 已提交
4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992
/**
 *	__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.
 *
 */
T
Tejun Heo 已提交
4993
static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
L
Linus Torvalds 已提交
4994
{
4995
	int rw = (qc->tf.flags & ATA_TFLAG_WRITE) ? WRITE : READ;
L
Linus Torvalds 已提交
4996
	struct ata_port *ap = qc->ap;
4997 4998
	struct ata_device *dev = qc->dev;
	struct ata_eh_info *ehi = &dev->link->eh_info;
T
Tejun Heo 已提交
4999
	struct scatterlist *sg;
L
Linus Torvalds 已提交
5000 5001
	struct page *page;
	unsigned char *buf;
5002
	unsigned int offset, count, consumed;
L
Linus Torvalds 已提交
5003 5004

next_sg:
T
Tejun Heo 已提交
5005 5006
	sg = qc->cursg;
	if (unlikely(!sg)) {
5007 5008 5009 5010
		ata_ehi_push_desc(ehi, "unexpected or too much trailing data "
				  "buf=%u cur=%u bytes=%u",
				  qc->nbytes, qc->curbytes, bytes);
		return -1;
T
Tejun Heo 已提交
5011
	}
L
Linus Torvalds 已提交
5012

J
Jens Axboe 已提交
5013
	page = sg_page(sg);
L
Linus Torvalds 已提交
5014 5015 5016 5017 5018 5019
	offset = sg->offset + qc->cursg_ofs;

	/* get the current page and offset */
	page = nth_page(page, (offset >> PAGE_SHIFT));
	offset %= PAGE_SIZE;

5020
	/* don't overrun current sg */
5021
	count = min(sg->length - qc->cursg_ofs, bytes);
L
Linus Torvalds 已提交
5022 5023 5024 5025

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

5026 5027
	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");

5028 5029 5030
	if (PageHighMem(page)) {
		unsigned long flags;

5031
		/* FIXME: use bounce buffer */
5032 5033
		local_irq_save(flags);
		buf = kmap_atomic(page, KM_IRQ0);
5034

5035
		/* do the actual data transfer */
5036
		consumed = ap->ops->data_xfer(dev,  buf + offset, count, rw);
5037

5038 5039 5040 5041
		kunmap_atomic(buf, KM_IRQ0);
		local_irq_restore(flags);
	} else {
		buf = page_address(page);
5042
		consumed = ap->ops->data_xfer(dev,  buf + offset, count, rw);
5043
	}
L
Linus Torvalds 已提交
5044

5045
	bytes -= min(bytes, consumed);
L
Linus Torvalds 已提交
5046 5047 5048
	qc->curbytes += count;
	qc->cursg_ofs += count;

5049
	if (qc->cursg_ofs == sg->length) {
J
Jens Axboe 已提交
5050
		qc->cursg = sg_next(qc->cursg);
L
Linus Torvalds 已提交
5051 5052 5053
		qc->cursg_ofs = 0;
	}

5054 5055 5056
	/* consumed can be larger than count only for the last transfer */
	WARN_ON(qc->cursg && count != consumed);

5057
	if (bytes)
L
Linus Torvalds 已提交
5058
		goto next_sg;
T
Tejun Heo 已提交
5059
	return 0;
L
Linus Torvalds 已提交
5060 5061
}

A
Albert Lee 已提交
5062 5063 5064 5065 5066 5067 5068 5069 5070 5071
/**
 *	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
5072 5073 5074 5075
static void atapi_pio_bytes(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *dev = qc->dev;
5076
	struct ata_eh_info *ehi = &dev->link->eh_info;
L
Linus Torvalds 已提交
5077 5078 5079
	unsigned int ireason, bc_lo, bc_hi, bytes;
	int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;

5080 5081 5082 5083 5084 5085 5086 5087 5088 5089
	/* 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
5090 5091 5092
	bytes = (bc_hi << 8) | bc_lo;

	/* shall be cleared to zero, indicating xfer of data */
5093
	if (unlikely(ireason & (1 << 0)))
5094
		goto atapi_check;
L
Linus Torvalds 已提交
5095 5096 5097

	/* make sure transfer direction matches expected */
	i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
5098
	if (unlikely(do_write != i_write))
5099
		goto atapi_check;
5100 5101

	if (unlikely(!bytes))
5102
		goto atapi_check;
L
Linus Torvalds 已提交
5103

T
Tejun Heo 已提交
5104
	VPRINTK("ata%u: xfering %d bytes\n", ap->print_id, bytes);
5105

5106
	if (unlikely(__atapi_pio_bytes(qc, bytes)))
T
Tejun Heo 已提交
5107
		goto err_out;
5108
	ata_altstatus(ap); /* flush */
L
Linus Torvalds 已提交
5109 5110 5111

	return;

5112 5113 5114 5115
 atapi_check:
	ata_ehi_push_desc(ehi, "ATAPI check failed (ireason=0x%x bytes=%u)",
			  ireason, bytes);
 err_out:
5116
	qc->err_mask |= AC_ERR_HSM;
A
Albert Lee 已提交
5117
	ap->hsm_task_state = HSM_ST_ERR;
L
Linus Torvalds 已提交
5118 5119 5120
}

/**
5121 5122 5123
 *	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
5124
 *
5125 5126
 *	RETURNS:
 *	1 if ok in workqueue, 0 otherwise.
L
Linus Torvalds 已提交
5127
 */
5128 5129

static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5130
{
5131 5132
	if (qc->tf.flags & ATA_TFLAG_POLLING)
		return 1;
L
Linus Torvalds 已提交
5133

5134 5135 5136 5137
	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
5138

T
Tejun Heo 已提交
5139
		if (ata_is_atapi(qc->tf.protocol) &&
5140 5141
		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
			return 1;
A
Albert Lee 已提交
5142 5143
	}

5144 5145
	return 0;
}
L
Linus Torvalds 已提交
5146

T
Tejun Heo 已提交
5147 5148 5149 5150 5151 5152 5153 5154
/**
 *	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
5155
 *	If @in_wq is zero, spin_lock_irqsave(host lock).
T
Tejun Heo 已提交
5156 5157 5158 5159 5160 5161 5162 5163 5164
 *	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) {
5165
			spin_lock_irqsave(ap->lock, flags);
T
Tejun Heo 已提交
5166

J
Jeff Garzik 已提交
5167 5168
			/* EH might have kicked in while host lock is
			 * released.
T
Tejun Heo 已提交
5169 5170 5171 5172
			 */
			qc = ata_qc_from_tag(ap, qc->tag);
			if (qc) {
				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
5173
					ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5174 5175 5176 5177 5178
					ata_qc_complete(qc);
				} else
					ata_port_freeze(ap);
			}

5179
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5180 5181 5182 5183 5184 5185 5186 5187
		} else {
			if (likely(!(qc->err_mask & AC_ERR_HSM)))
				ata_qc_complete(qc);
			else
				ata_port_freeze(ap);
		}
	} else {
		if (in_wq) {
5188
			spin_lock_irqsave(ap->lock, flags);
5189
			ap->ops->irq_on(ap);
T
Tejun Heo 已提交
5190
			ata_qc_complete(qc);
5191
			spin_unlock_irqrestore(ap->lock, flags);
T
Tejun Heo 已提交
5192 5193 5194 5195 5196
		} else
			ata_qc_complete(qc);
	}
}

5197 5198 5199 5200 5201 5202 5203 5204 5205 5206
/**
 *	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.
 */
5207 5208
int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
		 u8 status, int in_wq)
5209
{
5210 5211 5212
	unsigned long flags = 0;
	int poll_next;

5213 5214
	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);

5215 5216 5217 5218
	/* 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).
	 */
5219
	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
5220

5221
fsm_start:
5222
	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
T
Tejun Heo 已提交
5223
		ap->print_id, qc->tf.protocol, ap->hsm_task_state, status);
5224

5225 5226
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5227 5228 5229 5230 5231 5232 5233 5234
		/* 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);

5235
		/* check device status */
5236 5237 5238 5239 5240 5241 5242 5243 5244
		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
5245
			ap->hsm_task_state = HSM_ST_ERR;
5246
			goto fsm_start;
L
Linus Torvalds 已提交
5247 5248
		}

5249 5250
		/* Device should not ask for data transfer (DRQ=1)
		 * when it finds something wrong.
5251 5252 5253
		 * 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.
5254 5255
		 */
		if (unlikely(status & (ATA_ERR | ATA_DF))) {
5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268
			/* Some ATAPI tape drives forget to clear the ERR bit
			 * when doing the next command (mostly request sense).
			 * We ignore ERR here to workaround and proceed sending
			 * the CDB.
			 */
			if (!(qc->dev->horkage & ATA_HORKAGE_STUCK_ERR)) {
				ata_port_printk(ap, KERN_WARNING,
						"DRQ=1 with device error, "
						"dev_stat 0x%X\n", status);
				qc->err_mask |= AC_ERR_HSM;
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
5269
		}
L
Linus Torvalds 已提交
5270

5271 5272 5273 5274 5275 5276
		/* 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)
5277
			spin_lock_irqsave(ap->lock, flags);
L
Linus Torvalds 已提交
5278

5279 5280 5281 5282
		if (qc->tf.protocol == ATA_PROT_PIO) {
			/* PIO data out protocol.
			 * send first data block.
			 */
5283

5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294
			/* 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);
		} else
			/* send CDB */
			atapi_send_cdb(ap, qc);

		if (in_wq)
5295
			spin_unlock_irqrestore(ap->lock, flags);
5296 5297 5298 5299

		/* if polling, ata_pio_task() handles the rest.
		 * otherwise, interrupt handler takes over from here.
		 */
5300
		break;
5301

5302 5303
	case HSM_ST:
		/* complete command or read/write the data register */
5304
		if (qc->tf.protocol == ATAPI_PROT_PIO) {
5305 5306
			/* ATAPI PIO protocol */
			if ((status & ATA_DRQ) == 0) {
5307 5308 5309
				/* No more data to transfer or device error.
				 * Device error will be tagged in HSM_ST_LAST.
				 */
5310 5311 5312
				ap->hsm_task_state = HSM_ST_LAST;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5313

5314 5315
			/* Device should not ask for data transfer (DRQ=1)
			 * when it finds something wrong.
5316 5317 5318
			 * 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.
5319 5320
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
T
Tejun Heo 已提交
5321 5322 5323
				ata_port_printk(ap, KERN_WARNING, "DRQ=1 with "
						"device error, dev_stat 0x%X\n",
						status);
5324
				qc->err_mask |= AC_ERR_HSM;
5325 5326
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
5327
			}
L
Linus Torvalds 已提交
5328

5329
			atapi_pio_bytes(qc);
J
Jeff Garzik 已提交
5330

5331 5332 5333
			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
				/* bad ireason reported by device */
				goto fsm_start;
L
Linus Torvalds 已提交
5334

5335 5336 5337 5338
		} else {
			/* ATA PIO protocol */
			if (unlikely((status & ATA_DRQ) == 0)) {
				/* handle BSY=0, DRQ=0 as error */
5339 5340 5341 5342
				if (likely(status & (ATA_ERR | ATA_DF)))
					/* device stops HSM for abort/error */
					qc->err_mask |= AC_ERR_DEV;
				else
5343 5344 5345 5346 5347 5348
					/* HSM violation. Let EH handle this.
					 * Phantom devices also trigger this
					 * condition.  Mark hint.
					 */
					qc->err_mask |= AC_ERR_HSM |
							AC_ERR_NODEV_HINT;
5349

5350 5351 5352
				ap->hsm_task_state = HSM_ST_ERR;
				goto fsm_start;
			}
L
Linus Torvalds 已提交
5353

5354 5355 5356 5357 5358 5359 5360 5361 5362
			/* 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.
5363 5364 5365 5366
			 */
			if (unlikely(status & (ATA_ERR | ATA_DF))) {
				/* data might be corrputed */
				qc->err_mask |= AC_ERR_DEV;
5367 5368 5369 5370 5371 5372

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

5373 5374 5375
				if (status & (ATA_BUSY | ATA_DRQ))
					qc->err_mask |= AC_ERR_HSM;

5376 5377 5378 5379 5380 5381
				/* 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;
5382 5383
			}

5384 5385 5386 5387 5388
			ata_pio_sectors(qc);

			if (ap->hsm_task_state == HSM_ST_LAST &&
			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
				/* all data read */
5389
				status = ata_wait_idle(ap);
5390 5391 5392 5393
				goto fsm_start;
			}
		}

5394
		poll_next = 1;
L
Linus Torvalds 已提交
5395 5396
		break;

A
Albert Lee 已提交
5397
	case HSM_ST_LAST:
5398 5399
		if (unlikely(!ata_ok(status))) {
			qc->err_mask |= __ac_err_mask(status);
5400 5401 5402 5403 5404
			ap->hsm_task_state = HSM_ST_ERR;
			goto fsm_start;
		}

		/* no more data to transfer */
5405
		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
T
Tejun Heo 已提交
5406
			ap->print_id, qc->dev->devno, status);
5407

5408 5409
		WARN_ON(qc->err_mask);

5410
		ap->hsm_task_state = HSM_ST_IDLE;
L
Linus Torvalds 已提交
5411

5412
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5413
		ata_hsm_qc_complete(qc, in_wq);
5414 5415

		poll_next = 0;
L
Linus Torvalds 已提交
5416 5417
		break;

A
Albert Lee 已提交
5418
	case HSM_ST_ERR:
5419 5420 5421 5422 5423 5424
		/* 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;
5425

5426
		/* complete taskfile transaction */
T
Tejun Heo 已提交
5427
		ata_hsm_qc_complete(qc, in_wq);
5428 5429

		poll_next = 0;
5430 5431
		break;
	default:
5432
		poll_next = 0;
5433
		BUG();
L
Linus Torvalds 已提交
5434 5435
	}

5436
	return poll_next;
L
Linus Torvalds 已提交
5437 5438
}

5439
static void ata_pio_task(struct work_struct *work)
5440
{
5441 5442 5443
	struct ata_port *ap =
		container_of(work, struct ata_port, port_task.work);
	struct ata_queued_cmd *qc = ap->port_task_data;
5444
	u8 status;
5445
	int poll_next;
5446

J
Jeff Garzik 已提交
5447
fsm_start:
5448
	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
5449

5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461
	/*
	 * 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) {
5462
			ata_pio_queue_task(ap, qc, ATA_SHORT_PAUSE);
5463 5464
			return;
		}
5465 5466
	}

5467 5468
	/* move the HSM */
	poll_next = ata_hsm_move(ap, qc, status, 1);
5469

5470 5471 5472 5473
	/* another command or interrupt handler
	 * may be running at this point.
	 */
	if (poll_next)
J
Jeff Garzik 已提交
5474
		goto fsm_start;
5475 5476
}

L
Linus Torvalds 已提交
5477 5478 5479 5480 5481 5482
/**
 *	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
5483
 *	None.
L
Linus Torvalds 已提交
5484 5485 5486 5487 5488 5489 5490
 */

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

5491
	/* no command while frozen */
5492
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5493 5494
		return NULL;

5495 5496
	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
5497
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
5498
			qc = __ata_qc_from_tag(ap, i);
L
Linus Torvalds 已提交
5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512
			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
5513
 *	None.
L
Linus Torvalds 已提交
5514 5515
 */

T
Tejun Heo 已提交
5516
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
5517
{
T
Tejun Heo 已提交
5518
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
5519 5520 5521 5522 5523 5524 5525 5526
	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
5527
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540
	}

	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
5541
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5542 5543 5544
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
5545 5546 5547
	struct ata_port *ap = qc->ap;
	unsigned int tag;

5548
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
L
Linus Torvalds 已提交
5549

5550 5551 5552 5553
	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
5554
		clear_bit(tag, &ap->qc_allocated);
5555
	}
L
Linus Torvalds 已提交
5556 5557
}

5558
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5559
{
5560
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5561
	struct ata_link *link = qc->dev->link;
5562

5563 5564
	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
L
Linus Torvalds 已提交
5565 5566 5567 5568

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

5569
	/* command should be marked inactive atomically with qc completion */
5570
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
5571
		link->sactive &= ~(1 << qc->tag);
5572 5573 5574
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
5575
		link->active_tag = ATA_TAG_POISON;
5576 5577 5578 5579 5580 5581 5582
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
5583

5584 5585 5586 5587 5588
	/* 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;
5589
	ap->qc_active &= ~(1 << qc->tag);
5590

L
Linus Torvalds 已提交
5591
	/* call completion callback */
5592
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
5593 5594
}

5595 5596 5597 5598 5599
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
5600
	ap->ops->tf_read(ap, &qc->result_tf);
5601 5602
}

5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

	if (ata_tag_internal(qc->tag))
		return;

	if (ata_is_nodata(qc->tf.protocol))
		return;

	if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
		return;

	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}

5619 5620 5621 5622 5623 5624 5625 5626 5627
/**
 *	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
5628
 *	spin_lock_irqsave(host lock)
5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647
 */
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) {
5648 5649 5650
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

5651
		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
5652 5653 5654 5655 5656 5657 5658

		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 */
5659
				fill_result_tf(qc);
5660 5661 5662 5663 5664 5665 5666
				ata_qc_schedule_eh(qc);
				return;
			}
		}

		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5667
			fill_result_tf(qc);
5668

5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683
		/* Some commands need post-processing after successful
		 * completion.
		 */
		switch (qc->tf.command) {
		case ATA_CMD_SET_FEATURES:
			if (qc->tf.feature != SETFEATURES_WC_ON &&
			    qc->tf.feature != SETFEATURES_WC_OFF)
				break;
			/* fall through */
		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
		case ATA_CMD_SET_MULTI: /* multi_count changed */
			/* revalidate device */
			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
			ata_port_schedule_eh(ap);
			break;
5684 5685 5686 5687

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
5688 5689
		}

5690 5691 5692
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

5693 5694 5695 5696 5697 5698 5699
		__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)
5700
			fill_result_tf(qc);
5701 5702 5703 5704 5705

		__ata_qc_complete(qc);
	}
}

5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717
/**
 *	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
5718
 *	spin_lock_irqsave(host lock)
5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754
 *
 *	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
5755 5756 5757 5758 5759 5760 5761 5762 5763 5764
/**
 *	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
5765
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5766
 */
5767
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5768 5769
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5770
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
5771
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5772

5773 5774 5775 5776
	/* 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.
	 */
T
Tejun Heo 已提交
5777
	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5778

5779
	if (ata_is_ncq(prot)) {
T
Tejun Heo 已提交
5780
		WARN_ON(link->sactive & (1 << qc->tag));
5781 5782 5783

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5784
		link->sactive |= 1 << qc->tag;
5785
	} else {
T
Tejun Heo 已提交
5786
		WARN_ON(link->sactive);
5787 5788

		ap->nr_active_links++;
T
Tejun Heo 已提交
5789
		link->active_tag = qc->tag;
5790 5791
	}

5792
	qc->flags |= ATA_QCFLAG_ACTIVE;
5793
	ap->qc_active |= 1 << qc->tag;
5794

5795 5796 5797
	/* We guarantee to LLDs that they will have at least one
	 * non-zero sg if the command is a data command.
	 */
T
Tejun Heo 已提交
5798
	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
5799

T
Tejun Heo 已提交
5800
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5801
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5802 5803
		if (ata_sg_setup(qc))
			goto sg_err;
L
Linus Torvalds 已提交
5804

5805 5806 5807 5808 5809 5810 5811 5812
	/* if device is sleeping, schedule softreset and abort the link */
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
		link->eh_info.action |= ATA_EH_SOFTRESET;
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5813 5814
	ap->ops->qc_prep(qc);

5815 5816 5817 5818
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5819

5820
sg_err:
5821 5822 5823
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834
}

/**
 *	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
5835 5836
 *	May be used as the qc_issue() entry in ata_port_operations.
 *
L
Linus Torvalds 已提交
5837
 *	LOCKING:
J
Jeff Garzik 已提交
5838
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5839 5840
 *
 *	RETURNS:
5841
 *	Zero on success, AC_ERR_* mask on failure
L
Linus Torvalds 已提交
5842 5843
 */

5844
unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5845 5846 5847
{
	struct ata_port *ap = qc->ap;

5848 5849 5850 5851 5852 5853
	/* 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:
5854
		case ATA_PROT_NODATA:
5855 5856
		case ATAPI_PROT_PIO:
		case ATAPI_PROT_NODATA:
5857 5858
			qc->tf.flags |= ATA_TFLAG_POLLING;
			break;
5859
		case ATAPI_PROT_DMA:
5860
			if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
5861
				/* see ata_dma_blacklisted() */
5862 5863 5864 5865 5866 5867 5868
				BUG();
			break;
		default:
			break;
		}
	}

5869
	/* select the device */
L
Linus Torvalds 已提交
5870 5871
	ata_dev_select(ap, qc->dev->devno, 1, 0);

5872
	/* start the command */
L
Linus Torvalds 已提交
5873 5874
	switch (qc->tf.protocol) {
	case ATA_PROT_NODATA:
5875 5876 5877
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5878
		ata_tf_to_host(ap, &qc->tf);
5879 5880 5881
		ap->hsm_task_state = HSM_ST_LAST;

		if (qc->tf.flags & ATA_TFLAG_POLLING)
5882
			ata_pio_queue_task(ap, qc, 0);
5883

L
Linus Torvalds 已提交
5884 5885 5886
		break;

	case ATA_PROT_DMA:
J
Jeff Garzik 已提交
5887
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5888

L
Linus Torvalds 已提交
5889 5890 5891
		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 */
5892
		ap->hsm_task_state = HSM_ST_LAST;
L
Linus Torvalds 已提交
5893 5894
		break;

5895 5896 5897
	case ATA_PROT_PIO:
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);
L
Linus Torvalds 已提交
5898

J
Jeff Garzik 已提交
5899
		ata_tf_to_host(ap, &qc->tf);
5900

5901 5902 5903
		if (qc->tf.flags & ATA_TFLAG_WRITE) {
			/* PIO data out protocol */
			ap->hsm_task_state = HSM_ST_FIRST;
5904
			ata_pio_queue_task(ap, qc, 0);
5905 5906

			/* always send first data block using
5907
			 * the ata_pio_task() codepath.
5908
			 */
5909
		} else {
5910 5911 5912 5913
			/* PIO data in protocol */
			ap->hsm_task_state = HSM_ST;

			if (qc->tf.flags & ATA_TFLAG_POLLING)
5914
				ata_pio_queue_task(ap, qc, 0);
5915 5916 5917 5918

			/* if polling, ata_pio_task() handles the rest.
			 * otherwise, interrupt handler takes over from here.
			 */
5919 5920
		}

L
Linus Torvalds 已提交
5921 5922
		break;

5923 5924
	case ATAPI_PROT_PIO:
	case ATAPI_PROT_NODATA:
5925 5926 5927
		if (qc->tf.flags & ATA_TFLAG_POLLING)
			ata_qc_set_polling(qc);

J
Jeff Garzik 已提交
5928
		ata_tf_to_host(ap, &qc->tf);
J
Jeff Garzik 已提交
5929

5930 5931 5932 5933 5934
		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))
5935
			ata_pio_queue_task(ap, qc, 0);
L
Linus Torvalds 已提交
5936 5937
		break;

5938
	case ATAPI_PROT_DMA:
J
Jeff Garzik 已提交
5939
		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
5940

L
Linus Torvalds 已提交
5941 5942
		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
5943 5944 5945 5946
		ap->hsm_task_state = HSM_ST_FIRST;

		/* send cdb by polling if no cdb interrupt */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
5947
			ata_pio_queue_task(ap, qc, 0);
L
Linus Torvalds 已提交
5948 5949 5950 5951
		break;

	default:
		WARN_ON(1);
5952
		return AC_ERR_SYSTEM;
L
Linus Torvalds 已提交
5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967
	}

	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
5968
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5969 5970 5971 5972 5973
 *
 *	RETURNS:
 *	One if interrupt was handled, zero if not (shared irq).
 */

5974 5975
inline unsigned int ata_host_intr(struct ata_port *ap,
				  struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5976
{
T
Tejun Heo 已提交
5977
	struct ata_eh_info *ehi = &ap->link.eh_info;
5978
	u8 status, host_stat = 0;
L
Linus Torvalds 已提交
5979

5980
	VPRINTK("ata%u: protocol %d task_state %d\n",
T
Tejun Heo 已提交
5981
		ap->print_id, qc->tf.protocol, ap->hsm_task_state);
L
Linus Torvalds 已提交
5982

5983 5984 5985
	/* Check whether we are expecting interrupt in this state */
	switch (ap->hsm_task_state) {
	case HSM_ST_FIRST:
5986 5987 5988
		/* Some pre-ATAPI-4 devices assert INTRQ
		 * at this state when ready to receive CDB.
		 */
L
Linus Torvalds 已提交
5989

5990
		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
T
Tejun Heo 已提交
5991 5992
		 * The flag was turned on only for atapi devices.  No
		 * need to check ata_is_atapi(qc->tf.protocol) again.
5993 5994
		 */
		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
L
Linus Torvalds 已提交
5995 5996
			goto idle_irq;
		break;
5997 5998
	case HSM_ST_LAST:
		if (qc->tf.protocol == ATA_PROT_DMA ||
5999
		    qc->tf.protocol == ATAPI_PROT_DMA) {
6000 6001
			/* check status of DMA engine */
			host_stat = ap->ops->bmdma_status(ap);
T
Tejun Heo 已提交
6002 6003
			VPRINTK("ata%u: host_stat 0x%X\n",
				ap->print_id, host_stat);
6004 6005 6006 6007 6008 6009 6010

			/* 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);
6011 6012 6013 6014 6015 6016

			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;
			}
6017 6018 6019 6020
		}
		break;
	case HSM_ST:
		break;
L
Linus Torvalds 已提交
6021 6022 6023 6024
	default:
		goto idle_irq;
	}

6025 6026 6027 6028
	/* check altstatus */
	status = ata_altstatus(ap);
	if (status & ATA_BUSY)
		goto idle_irq;
L
Linus Torvalds 已提交
6029

6030 6031 6032 6033
	/* check main status, clearing INTRQ */
	status = ata_chk_status(ap);
	if (unlikely(status & ATA_BUSY))
		goto idle_irq;
L
Linus Torvalds 已提交
6034

6035 6036
	/* ack bmdma irq events */
	ap->ops->irq_clear(ap);
L
Linus Torvalds 已提交
6037

6038
	ata_hsm_move(ap, qc, status, 0);
6039 6040

	if (unlikely(qc->err_mask) && (qc->tf.protocol == ATA_PROT_DMA ||
6041
				       qc->tf.protocol == ATAPI_PROT_DMA))
6042 6043
		ata_ehi_push_desc(ehi, "BMDMA stat 0x%x", host_stat);

L
Linus Torvalds 已提交
6044 6045 6046 6047 6048 6049 6050
	return 1;	/* irq handled */

idle_irq:
	ap->stats.idle_irq++;

#ifdef ATA_IRQ_TRAP
	if ((ap->stats.idle_irq % 1000) == 0) {
6051 6052
		ata_chk_status(ap);
		ap->ops->irq_clear(ap);
6053
		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
6054
		return 1;
L
Linus Torvalds 已提交
6055 6056 6057 6058 6059 6060 6061
	}
#endif
	return 0;	/* irq not handled */
}

/**
 *	ata_interrupt - Default ATA host interrupt handler
J
Jeff Garzik 已提交
6062
 *	@irq: irq line (unused)
J
Jeff Garzik 已提交
6063
 *	@dev_instance: pointer to our ata_host information structure
L
Linus Torvalds 已提交
6064
 *
J
Jeff Garzik 已提交
6065 6066 6067
 *	Default interrupt handler for PCI IDE devices.  Calls
 *	ata_host_intr() for each port that is not disabled.
 *
L
Linus Torvalds 已提交
6068
 *	LOCKING:
J
Jeff Garzik 已提交
6069
 *	Obtains host lock during operation.
L
Linus Torvalds 已提交
6070 6071
 *
 *	RETURNS:
J
Jeff Garzik 已提交
6072
 *	IRQ_NONE or IRQ_HANDLED.
L
Linus Torvalds 已提交
6073 6074
 */

6075
irqreturn_t ata_interrupt(int irq, void *dev_instance)
L
Linus Torvalds 已提交
6076
{
J
Jeff Garzik 已提交
6077
	struct ata_host *host = dev_instance;
L
Linus Torvalds 已提交
6078 6079 6080 6081 6082
	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
6083
	spin_lock_irqsave(&host->lock, flags);
L
Linus Torvalds 已提交
6084

J
Jeff Garzik 已提交
6085
	for (i = 0; i < host->n_ports; i++) {
L
Linus Torvalds 已提交
6086 6087
		struct ata_port *ap;

J
Jeff Garzik 已提交
6088
		ap = host->ports[i];
6089
		if (ap &&
J
Jeff Garzik 已提交
6090
		    !(ap->flags & ATA_FLAG_DISABLED)) {
L
Linus Torvalds 已提交
6091 6092
			struct ata_queued_cmd *qc;

T
Tejun Heo 已提交
6093
			qc = ata_qc_from_tag(ap, ap->link.active_tag);
6094
			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
6095
			    (qc->flags & ATA_QCFLAG_ACTIVE))
L
Linus Torvalds 已提交
6096 6097 6098 6099
				handled |= ata_host_intr(ap, qc);
		}
	}

J
Jeff Garzik 已提交
6100
	spin_unlock_irqrestore(&host->lock, flags);
L
Linus Torvalds 已提交
6101 6102 6103 6104

	return IRQ_RETVAL(handled);
}

6105 6106
/**
 *	sata_scr_valid - test whether SCRs are accessible
6107
 *	@link: ATA link to test SCR accessibility for
6108
 *
6109
 *	Test whether SCRs are accessible for @link.
6110 6111 6112 6113 6114 6115 6116
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
6117
int sata_scr_valid(struct ata_link *link)
6118
{
6119 6120
	struct ata_port *ap = link->ap;

6121
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
6122 6123 6124 6125
}

/**
 *	sata_scr_read - read SCR register of the specified port
6126
 *	@link: ATA link to read SCR for
6127 6128 6129
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
6130
 *	Read SCR register @reg of @link into *@val.  This function is
6131 6132
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6133 6134
 *
 *	LOCKING:
6135
 *	None if @link is ap->link.  Kernel thread context otherwise.
6136 6137 6138 6139
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6140
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
6141
{
6142 6143
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
6144

6145 6146 6147 6148 6149 6150
		if (sata_scr_valid(link))
			return ap->ops->scr_read(ap, reg, val);
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
6151 6152 6153 6154
}

/**
 *	sata_scr_write - write SCR register of the specified port
6155
 *	@link: ATA link to write SCR for
6156 6157 6158
 *	@reg: SCR to write
 *	@val: value to write
 *
6159
 *	Write @val to SCR register @reg of @link.  This function is
6160 6161
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
6162 6163
 *
 *	LOCKING:
6164
 *	None if @link is ap->link.  Kernel thread context otherwise.
6165 6166 6167 6168
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6169
int sata_scr_write(struct ata_link *link, int reg, u32 val)
6170
{
6171 6172 6173 6174 6175 6176 6177
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;

		if (sata_scr_valid(link))
			return ap->ops->scr_write(ap, reg, val);
		return -EOPNOTSUPP;
	}
6178

6179
	return sata_pmp_scr_write(link, reg, val);
6180 6181 6182 6183
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
6184
 *	@link: ATA link to write SCR for
6185 6186 6187 6188 6189 6190 6191
 *	@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:
6192
 *	None if @link is ap->link.  Kernel thread context otherwise.
6193 6194 6195 6196
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
6197
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
6198
{
6199 6200 6201
	if (ata_is_host_link(link)) {
		struct ata_port *ap = link->ap;
		int rc;
6202

6203 6204 6205 6206 6207 6208 6209
		if (sata_scr_valid(link)) {
			rc = ap->ops->scr_write(ap, reg, val);
			if (rc == 0)
				rc = ap->ops->scr_read(ap, reg, &val);
			return rc;
		}
		return -EOPNOTSUPP;
6210
	}
6211 6212

	return sata_pmp_scr_write(link, reg, val);
6213 6214 6215
}

/**
6216 6217
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
6218
 *
6219 6220 6221
 *	Test whether @link is online.  Note that this function returns
 *	0 if online status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
6222 6223 6224 6225 6226 6227 6228
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port online status is available and online.
 */
6229
int ata_link_online(struct ata_link *link)
6230 6231 6232
{
	u32 sstatus;

6233 6234
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) == 0x3)
6235 6236 6237 6238 6239
		return 1;
	return 0;
}

/**
6240 6241
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
6242
 *
6243 6244 6245
 *	Test whether @link is offline.  Note that this function
 *	returns 0 if offline status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
6246 6247 6248 6249 6250 6251 6252
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if the port offline status is available and offline.
 */
6253
int ata_link_offline(struct ata_link *link)
6254 6255 6256
{
	u32 sstatus;

6257 6258
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
	    (sstatus & 0xf) != 0x3)
6259 6260 6261
		return 1;
	return 0;
}
E
Edward Falk 已提交
6262

6263
int ata_flush_cache(struct ata_device *dev)
J
Jens Axboe 已提交
6264
{
6265
	unsigned int err_mask;
J
Jens Axboe 已提交
6266 6267 6268 6269 6270
	u8 cmd;

	if (!ata_try_flush_cache(dev))
		return 0;

6271
	if (dev->flags & ATA_DFLAG_FLUSH_EXT)
J
Jens Axboe 已提交
6272 6273 6274 6275
		cmd = ATA_CMD_FLUSH_EXT;
	else
		cmd = ATA_CMD_FLUSH;

6276 6277
	/* This is wrong. On a failed flush we get back the LBA of the lost
	   sector and we should (assuming it wasn't aborted as unknown) issue
6278
	   a further flush command to continue the writeback until it
6279
	   does not error */
6280 6281 6282 6283 6284 6285 6286
	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
6287 6288
}

6289
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6290 6291 6292
static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
			       unsigned int action, unsigned int ehi_flags,
			       int wait)
6293 6294 6295 6296
{
	unsigned long flags;
	int i, rc;

J
Jeff Garzik 已提交
6297 6298
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6299
		struct ata_link *link;
6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318

		/* 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;
6319 6320 6321 6322
		__ata_port_for_each_link(link, ap) {
			link->eh_info.action |= action;
			link->eh_info.flags |= ehi_flags;
		}
6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340

		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
6341 6342
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
6343 6344
 *	@mesg: PM message
 *
J
Jeff Garzik 已提交
6345
 *	Suspend @host.  Actual operation is performed by EH.  This
6346 6347 6348 6349 6350 6351 6352 6353 6354
 *	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
6355
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
6356
{
6357
	int rc;
6358

6359 6360 6361 6362 6363 6364
	/*
	 * disable link pm on all ports before requesting
	 * any pm activity
	 */
	ata_lpm_enable(host);

J
Jeff Garzik 已提交
6365
	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
6366 6367
	if (rc == 0)
		host->dev->power.power_state = mesg;
6368 6369 6370 6371
	return rc;
}

/**
J
Jeff Garzik 已提交
6372 6373
 *	ata_host_resume - resume host
 *	@host: host to resume
6374
 *
J
Jeff Garzik 已提交
6375
 *	Resume @host.  Actual operation is performed by EH.  This
6376 6377 6378 6379 6380 6381
 *	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
6382
void ata_host_resume(struct ata_host *host)
6383
{
J
Jeff Garzik 已提交
6384 6385 6386
	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;
6387 6388 6389

	/* reenable link pm */
	ata_lpm_disable(host);
6390
}
6391
#endif
6392

6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404
/**
 *	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.
 */
6405
int ata_port_start(struct ata_port *ap)
L
Linus Torvalds 已提交
6406
{
6407
	struct device *dev = ap->dev;
L
Linus Torvalds 已提交
6408

6409 6410
	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
				      GFP_KERNEL);
L
Linus Torvalds 已提交
6411 6412 6413 6414 6415 6416
	if (!ap->prd)
		return -ENOMEM;

	return 0;
}

6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427
/**
 *	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)
{
T
Tejun Heo 已提交
6428 6429
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
6430 6431
	unsigned long flags;

6432
	/* SATA spd limit is bound to the first device */
T
Tejun Heo 已提交
6433 6434
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
6435

6436 6437
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
6438
	 * host lock.
6439
	 */
6440
	spin_lock_irqsave(ap->lock, flags);
6441
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
6442
	dev->horkage = 0;
6443
	spin_unlock_irqrestore(ap->lock, flags);
6444

6445 6446
	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
6447 6448 6449 6450 6451
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

6452 6453 6454 6455
/**
 *	ata_link_init - Initialize an ata_link structure
 *	@ap: ATA port link is attached to
 *	@link: Link structure to initialize
T
Tejun Heo 已提交
6456
 *	@pmp: Port multiplier port number
6457 6458 6459 6460 6461 6462
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
6463
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
6464 6465 6466 6467 6468 6469 6470
{
	int i;

	/* clear everything except for devices */
	memset(link, 0, offsetof(struct ata_link, device[0]));

	link->ap = ap;
T
Tejun Heo 已提交
6471
	link->pmp = pmp;
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
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

	/* can't use iterator, ap isn't initialized yet */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &link->device[i];

		dev->link = link;
		dev->devno = dev - link->device;
		ata_dev_init(dev);
	}
}

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
6498
int sata_link_init_spd(struct ata_link *link)
6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515
{
	u32 scontrol, spd;
	int rc;

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

	spd = (scontrol >> 4) & 0xf;
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
6516
/**
6517 6518
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
6519
 *
6520 6521 6522 6523
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
6524
 *
L
Linus Torvalds 已提交
6525
 *	LOCKING:
6526
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
6527
 */
6528
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
6529
{
6530
	struct ata_port *ap;
L
Linus Torvalds 已提交
6531

6532 6533 6534 6535 6536 6537
	DPRINTK("ENTER\n");

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

6538
	ap->pflags |= ATA_PFLAG_INITIALIZING;
J
Jeff Garzik 已提交
6539
	ap->lock = &host->lock;
6540
	ap->flags = ATA_FLAG_DISABLED;
6541
	ap->print_id = -1;
L
Linus Torvalds 已提交
6542
	ap->ctl = ATA_DEVCTL_OBS;
J
Jeff Garzik 已提交
6543
	ap->host = host;
6544
	ap->dev = host->dev;
L
Linus Torvalds 已提交
6545
	ap->last_ctl = 0xFF;
6546 6547 6548 6549 6550 6551

#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
6552
#else
6553
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6554
#endif
L
Linus Torvalds 已提交
6555

6556
	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
6557 6558
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6559
	INIT_LIST_HEAD(&ap->eh_done_q);
6560
	init_waitqueue_head(&ap->eh_wait_q);
T
Tejun Heo 已提交
6561 6562 6563
	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
6564

6565 6566
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
6567
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
6568 6569 6570 6571 6572 6573 6574 6575

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

6576 6577 6578 6579 6580
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

6581 6582 6583
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

6584 6585 6586 6587
		if (!ap)
			continue;

		if (ap->scsi_host)
6588 6589
			scsi_host_put(ap->scsi_host);

6590
		kfree(ap->pmp_link);
6591
		kfree(ap);
6592 6593 6594
		host->ports[i] = NULL;
	}

6595
	dev_set_drvdata(gendev, NULL);
6596 6597
}

6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662
/**
 *	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;
}

6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700
/**
 *	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;
6701
		ap->link.flags |= pi->link_flags;
6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712
		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;
}

6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730
static void ata_host_stop(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

	WARN_ON(!(host->flags & ATA_HOST_STARTED));

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

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

	if (host->ops->host_stop)
		host->ops->host_stop(host);
}

6731 6732 6733 6734 6735 6736 6737
/**
 *	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
6738 6739
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
6740 6741 6742 6743 6744 6745 6746 6747 6748
 *
 *	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)
{
6749 6750
	int have_stop = 0;
	void *start_dr = NULL;
6751 6752 6753 6754 6755 6756 6757 6758
	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];

6759 6760 6761
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777
		if (ap->ops->port_stop)
			have_stop = 1;
	}

	if (host->ops->host_stop)
		have_stop = 1;

	if (have_stop) {
		start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
		if (!start_dr)
			return -ENOMEM;
	}

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

6778 6779 6780
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
6781
				if (rc != -ENODEV)
A
Andrew Morton 已提交
6782 6783 6784
					dev_printk(KERN_ERR, host->dev,
						"failed to start port %d "
						"(errno=%d)\n", i, rc);
6785 6786 6787 6788 6789 6790
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

6791 6792
	if (start_dr)
		devres_add(host->dev, start_dr);
6793 6794 6795 6796 6797 6798 6799 6800 6801 6802
	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);
	}
6803
	devres_free(start_dr);
6804 6805 6806
	return rc;
}

6807
/**
J
Jeff Garzik 已提交
6808 6809 6810 6811 6812
 *	ata_sas_host_init - Initialize a host struct
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@flags:	host flags
 *	@ops:	port_ops
6813 6814 6815 6816 6817
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 */
6818
/* KILLME - the only user left is ipr */
J
Jeff Garzik 已提交
6819 6820
void ata_host_init(struct ata_host *host, struct device *dev,
		   unsigned long flags, const struct ata_port_operations *ops)
6821
{
J
Jeff Garzik 已提交
6822 6823 6824 6825
	spin_lock_init(&host->lock);
	host->dev = dev;
	host->flags = flags;
	host->ops = ops;
6826 6827
}

6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869 6870
/**
 *	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;

6871 6872 6873
	/* associate with ACPI nodes */
	ata_acpi_associate(host);

6874 6875 6876 6877 6878 6879 6880 6881 6882 6883
	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		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 */
6884
		sata_link_init_spd(&ap->link);
6885

6886
		/* print per-port info to dmesg */
6887 6888 6889
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6890
		if (!ata_port_is_dummy(ap)) {
6891 6892
			ata_port_printk(ap, KERN_INFO,
					"%cATA max %s %s\n",
6893
					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6894
					ata_mode_string(xfer_mask),
6895
					ap->link.eh_info.desc);
6896 6897
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6898 6899 6900 6901 6902 6903 6904 6905 6906 6907
			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];

		/* probe */
		if (ap->ops->error_handler) {
T
Tejun Heo 已提交
6908
			struct ata_eh_info *ehi = &ap->link.eh_info;
6909 6910 6911 6912 6913 6914 6915
			unsigned long flags;

			ata_port_probe(ap);

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

6916 6917
			ehi->probe_mask =
				(1 << ata_link_max_devices(&ap->link)) - 1;
6918 6919 6920
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

6921
			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6922 6923 6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944 6945 6946 6947 6948 6949
			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];

6950
		ata_scsi_scan_host(ap, 1);
6951
		ata_lpm_schedule(ap, ap->pm_policy);
6952 6953 6954 6955 6956
	}

	return 0;
}

6957 6958 6959 6960 6961 6962 6963 6964 6965 6966 6967 6968 6969
/**
 *	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.
 *
6970 6971 6972 6973
 *	An invalid IRQ skips the IRQ registration and expects the host to
 *	have set polling mode on the port. In this case, @irq_handler
 *	should be NULL.
 *
6974 6975 6976 6977 6978 6979 6980 6981 6982 6983
 *	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)
{
6984
	int i, rc;
6985 6986 6987 6988 6989

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

6990 6991 6992 6993 6994 6995
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6996 6997 6998 6999 7000
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

7001 7002
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
7003

7004 7005 7006 7007 7008 7009 7010 7011
	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;
}

7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022
/**
 *	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).
 */
7023
static void ata_port_detach(struct ata_port *ap)
7024 7025
{
	unsigned long flags;
7026
	struct ata_link *link;
7027
	struct ata_device *dev;
7028 7029

	if (!ap->ops->error_handler)
7030
		goto skip_eh;
7031 7032

	/* tell EH we're leaving & flush EH */
7033
	spin_lock_irqsave(ap->lock, flags);
7034
	ap->pflags |= ATA_PFLAG_UNLOADING;
7035
	spin_unlock_irqrestore(ap->lock, flags);
7036 7037 7038

	ata_port_wait_eh(ap);

7039 7040
	/* EH is now guaranteed to see UNLOADING - EH context belongs
	 * to us.  Disable all existing devices.
7041
	 */
7042 7043 7044 7045
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link)
			ata_dev_disable(dev);
	}
7046 7047 7048 7049 7050

	/* Final freeze & EH.  All in-flight commands are aborted.  EH
	 * will be skipped and retrials will be terminated with bad
	 * target.
	 */
7051
	spin_lock_irqsave(ap->lock, flags);
7052
	ata_port_freeze(ap);	/* won't be thawed */
7053
	spin_unlock_irqrestore(ap->lock, flags);
7054 7055

	ata_port_wait_eh(ap);
7056
	cancel_rearming_delayed_work(&ap->hotplug_task);
7057

7058
 skip_eh:
7059
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
7060
	scsi_remove_host(ap->scsi_host);
7061 7062
}

T
Tejun Heo 已提交
7063 7064 7065 7066 7067 7068 7069 7070 7071 7072 7073 7074 7075 7076 7077
/**
 *	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]);
7078 7079 7080

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
7081 7082
}

L
Linus Torvalds 已提交
7083 7084 7085
/**
 *	ata_std_ports - initialize ioaddr with standard port offsets.
 *	@ioaddr: IO address structure to be initialized
E
Edward Falk 已提交
7086 7087 7088 7089 7090 7091 7092
 *
 *	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
7093
 */
E
Edward Falk 已提交
7094

L
Linus Torvalds 已提交
7095 7096 7097 7098 7099 7100 7101 7102 7103 7104 7105 7106 7107 7108
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
7109

7110 7111
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
7112 7113 7114 7115
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
7116 7117 7118
 *	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
7119 7120 7121 7122
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
7123
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
7124
{
7125
	struct device *dev = &pdev->dev;
J
Jeff Garzik 已提交
7126
	struct ata_host *host = dev_get_drvdata(dev);
L
Linus Torvalds 已提交
7127

T
Tejun Heo 已提交
7128
	ata_host_detach(host);
L
Linus Torvalds 已提交
7129 7130 7131
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
7132
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
7133 7134 7135 7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154 7155 7156 7157 7158 7159 7160 7161 7162 7163
{
	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
7164

7165
#ifdef CONFIG_PM
7166
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
7167 7168
{
	pci_save_state(pdev);
7169
	pci_disable_device(pdev);
7170

7171
	if (mesg.event == PM_EVENT_SUSPEND)
7172
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
7173 7174
}

7175
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
7176
{
7177 7178
	int rc;

J
Jens Axboe 已提交
7179 7180
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
7181

T
Tejun Heo 已提交
7182
	rc = pcim_enable_device(pdev);
7183 7184 7185 7186 7187 7188
	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
7189
	pci_set_master(pdev);
7190
	return 0;
7191 7192
}

7193
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
7194
{
J
Jeff Garzik 已提交
7195
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7196 7197
	int rc = 0;

J
Jeff Garzik 已提交
7198
	rc = ata_host_suspend(host, mesg);
7199 7200 7201
	if (rc)
		return rc;

7202
	ata_pci_device_do_suspend(pdev, mesg);
7203 7204 7205 7206 7207 7208

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
J
Jeff Garzik 已提交
7209
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
7210
	int rc;
7211

7212 7213 7214 7215
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
7216
}
7217 7218
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
7219 7220 7221 7222 7223
#endif /* CONFIG_PCI */


static int __init ata_init(void)
{
A
Andrew Morton 已提交
7224
	ata_probe_timeout *= HZ;
L
Linus Torvalds 已提交
7225 7226 7227 7228
	ata_wq = create_workqueue("ata");
	if (!ata_wq)
		return -ENOMEM;

7229 7230 7231 7232 7233 7234
	ata_aux_wq = create_singlethread_workqueue("ata_aux");
	if (!ata_aux_wq) {
		destroy_workqueue(ata_wq);
		return -ENOMEM;
	}

L
Linus Torvalds 已提交
7235 7236 7237 7238 7239 7240 7241
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
}

static void __exit ata_exit(void)
{
	destroy_workqueue(ata_wq);
7242
	destroy_workqueue(ata_aux_wq);
L
Linus Torvalds 已提交
7243 7244
}

7245
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
7246 7247
module_exit(ata_exit);

7248
static unsigned long ratelimit_time;
I
Ingo Molnar 已提交
7249
static DEFINE_SPINLOCK(ata_ratelimit_lock);
7250 7251 7252 7253 7254 7255 7256 7257 7258 7259 7260 7261 7262 7263 7264 7265 7266 7267 7268

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;
}

7269 7270 7271 7272 7273 7274 7275 7276 7277 7278 7279 7280 7281 7282 7283 7284 7285 7286 7287 7288 7289 7290 7291 7292 7293 7294 7295 7296 7297 7298 7299 7300 7301 7302 7303 7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314
/**
 *	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
7315 7316 7317 7318 7319 7320 7321 7322 7323 7324 7325 7326 7327 7328 7329 7330 7331 7332 7333 7334 7335 7336 7337 7338 7339 7340 7341 7342 7343 7344 7345 7346
/*
 * 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 = {
	.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,
};

7347 7348 7349 7350
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

L
Linus Torvalds 已提交
7351 7352 7353 7354 7355 7356
/*
 * 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.
 */
7357 7358 7359
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
7360
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7361
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
L
Linus Torvalds 已提交
7362 7363
EXPORT_SYMBOL_GPL(ata_std_bios_param);
EXPORT_SYMBOL_GPL(ata_std_ports);
J
Jeff Garzik 已提交
7364
EXPORT_SYMBOL_GPL(ata_host_init);
7365
EXPORT_SYMBOL_GPL(ata_host_alloc);
7366
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7367
EXPORT_SYMBOL_GPL(ata_host_start);
7368
EXPORT_SYMBOL_GPL(ata_host_register);
7369
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
7370
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
7371
EXPORT_SYMBOL_GPL(ata_sg_init);
7372
EXPORT_SYMBOL_GPL(ata_hsm_move);
7373
EXPORT_SYMBOL_GPL(ata_qc_complete);
7374
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
L
Linus Torvalds 已提交
7375 7376 7377 7378 7379
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);
7380
EXPORT_SYMBOL_GPL(sata_print_link_status);
L
Linus Torvalds 已提交
7381 7382
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7383 7384 7385 7386 7387 7388 7389
EXPORT_SYMBOL_GPL(ata_pack_xfermask);
EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
EXPORT_SYMBOL_GPL(ata_mode_string);
EXPORT_SYMBOL_GPL(ata_id_xfermask);
L
Linus Torvalds 已提交
7390 7391 7392 7393
EXPORT_SYMBOL_GPL(ata_check_status);
EXPORT_SYMBOL_GPL(ata_altstatus);
EXPORT_SYMBOL_GPL(ata_exec_command);
EXPORT_SYMBOL_GPL(ata_port_start);
7394
EXPORT_SYMBOL_GPL(ata_sff_port_start);
L
Linus Torvalds 已提交
7395
EXPORT_SYMBOL_GPL(ata_interrupt);
7396
EXPORT_SYMBOL_GPL(ata_do_set_mode);
T
Tejun Heo 已提交
7397 7398
EXPORT_SYMBOL_GPL(ata_data_xfer);
EXPORT_SYMBOL_GPL(ata_data_xfer_noirq);
7399
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
L
Linus Torvalds 已提交
7400
EXPORT_SYMBOL_GPL(ata_qc_prep);
7401
EXPORT_SYMBOL_GPL(ata_dumb_qc_prep);
7402
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
L
Linus Torvalds 已提交
7403 7404 7405 7406 7407
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);
7408 7409 7410 7411 7412
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
7413
EXPORT_SYMBOL_GPL(ata_port_probe);
7414
EXPORT_SYMBOL_GPL(ata_dev_disable);
7415
EXPORT_SYMBOL_GPL(sata_set_spd);
7416 7417
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
L
Linus Torvalds 已提交
7418
EXPORT_SYMBOL_GPL(ata_bus_reset);
7419
EXPORT_SYMBOL_GPL(ata_std_prereset);
7420
EXPORT_SYMBOL_GPL(ata_std_softreset);
T
Tejun Heo 已提交
7421
EXPORT_SYMBOL_GPL(sata_link_hardreset);
7422 7423
EXPORT_SYMBOL_GPL(sata_std_hardreset);
EXPORT_SYMBOL_GPL(ata_std_postreset);
7424 7425
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
L
Linus Torvalds 已提交
7426
EXPORT_SYMBOL_GPL(ata_port_disable);
7427
EXPORT_SYMBOL_GPL(ata_ratelimit);
7428
EXPORT_SYMBOL_GPL(ata_wait_register);
7429
EXPORT_SYMBOL_GPL(ata_busy_sleep);
7430
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7431
EXPORT_SYMBOL_GPL(ata_wait_ready);
L
Linus Torvalds 已提交
7432 7433 7434
EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7435
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7436
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
L
Linus Torvalds 已提交
7437
EXPORT_SYMBOL_GPL(ata_host_intr);
7438 7439 7440 7441
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);
7442 7443
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
7444
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
7445 7446
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
7447
#endif /* CONFIG_PM */
7448 7449
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
L
Linus Torvalds 已提交
7450 7451
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

7452
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7453
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
7454 7455
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
7456
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
7457

L
Linus Torvalds 已提交
7458 7459
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
7460
EXPORT_SYMBOL_GPL(ata_pci_init_sff_host);
T
Tejun Heo 已提交
7461
EXPORT_SYMBOL_GPL(ata_pci_init_bmdma);
7462
EXPORT_SYMBOL_GPL(ata_pci_prepare_sff_host);
7463
EXPORT_SYMBOL_GPL(ata_pci_activate_sff_host);
L
Linus Torvalds 已提交
7464 7465
EXPORT_SYMBOL_GPL(ata_pci_init_one);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7466
#ifdef CONFIG_PM
7467 7468
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
7469 7470
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7471
#endif /* CONFIG_PM */
A
Alan Cox 已提交
7472 7473
EXPORT_SYMBOL_GPL(ata_pci_default_filter);
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
L
Linus Torvalds 已提交
7474
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
7475

7476
EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
7477 7478 7479 7480 7481
EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
EXPORT_SYMBOL_GPL(sata_pmp_do_eh);

T
Tejun Heo 已提交
7482 7483 7484
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7485 7486 7487 7488
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
7489
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7490
EXPORT_SYMBOL_GPL(ata_link_abort);
7491
EXPORT_SYMBOL_GPL(ata_port_abort);
7492
EXPORT_SYMBOL_GPL(ata_port_freeze);
7493
EXPORT_SYMBOL_GPL(sata_async_notification);
7494 7495
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7496 7497
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
T
Tejun Heo 已提交
7498
EXPORT_SYMBOL_GPL(ata_do_eh);
7499
EXPORT_SYMBOL_GPL(ata_irq_on);
A
Akira Iguchi 已提交
7500
EXPORT_SYMBOL_GPL(ata_dev_try_classify);
A
Alan Cox 已提交
7501 7502 7503 7504

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
7505
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
7506
EXPORT_SYMBOL_GPL(ata_cable_sata);