Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 6636 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
new file mode 100644
index 0000000..b07b2ff
--- /dev/null
+++ b/drivers/ata/libata-core.c
@@ -0,0 +1,6636 @@
+/*
+ *  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/
+ *
+ *  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)
+ *
+ */
+
+#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/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>
+#include <linux/scatterlist.h>
+#include <linux/io.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <asm/byteorder.h>
+#include <linux/cdrom.h>
+
+#include "libata.h"
+
+
+/* debounce timing parameters in msecs { interval, duration, timeout } */
+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 };
+
+const struct ata_port_operations ata_base_port_ops = {
+	.prereset		= ata_std_prereset,
+	.postreset		= ata_std_postreset,
+	.error_handler		= ata_std_error_handler,
+};
+
+const struct ata_port_operations sata_port_ops = {
+	.inherits		= &ata_base_port_ops,
+
+	.qc_defer		= ata_std_qc_defer,
+	.hardreset		= sata_std_hardreset,
+};
+
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+					u16 heads, u16 sectors);
+static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
+static unsigned int ata_dev_set_feature(struct ata_device *dev,
+					u8 enable, u8 feature);
+static void ata_dev_xfermask(struct ata_device *dev);
+static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
+
+unsigned int ata_print_id = 1;
+static struct workqueue_struct *ata_wq;
+
+struct workqueue_struct *ata_aux_wq;
+
+struct ata_force_param {
+	const char	*name;
+	unsigned int	cbl;
+	int		spd_limit;
+	unsigned long	xfer_mask;
+	unsigned int	horkage_on;
+	unsigned int	horkage_off;
+	unsigned int	lflags;
+};
+
+struct ata_force_ent {
+	int			port;
+	int			device;
+	struct ata_force_param	param;
+};
+
+static struct ata_force_ent *ata_force_tbl;
+static int ata_force_tbl_size;
+
+static char ata_force_param_buf[PAGE_SIZE] __initdata;
+/* param_buf is thrown away after initialization, disallow read */
+module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
+MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");
+
+static int atapi_enabled = 1;
+module_param(atapi_enabled, int, 0444);
+MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
+
+static int atapi_dmadir = 0;
+module_param(atapi_dmadir, int, 0444);
+MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
+
+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)");
+
+int libata_fua = 0;
+module_param_named(fua, libata_fua, int, 0444);
+MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
+
+static int ata_ignore_hpa;
+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)");
+
+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)");
+
+static int ata_probe_timeout;
+module_param(ata_probe_timeout, int, 0444);
+MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
+
+int libata_noacpi = 0;
+module_param_named(noacpi, libata_noacpi, int, 0444);
+MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume when set");
+
+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");
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("Library module for ATA devices");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+
+/*
+ * Iterator helpers.  Don't use directly.
+ *
+ * LOCKING:
+ * Host lock or EH context.
+ */
+struct ata_link *__ata_port_next_link(struct ata_port *ap,
+				      struct ata_link *link, bool dev_only)
+{
+	/* NULL link indicates start of iteration */
+	if (!link) {
+		if (dev_only && sata_pmp_attached(ap))
+			return ap->pmp_link;
+		return &ap->link;
+	}
+
+	/* we just iterated over the host master link, what's next? */
+	if (link == &ap->link) {
+		if (!sata_pmp_attached(ap)) {
+			if (unlikely(ap->slave_link) && !dev_only)
+				return ap->slave_link;
+			return NULL;
+		}
+		return ap->pmp_link;
+	}
+
+	/* slave_link excludes PMP */
+	if (unlikely(link == ap->slave_link))
+		return NULL;
+
+	/* iterate to the next PMP link */
+	if (++link < ap->pmp_link + ap->nr_pmp_links)
+		return link;
+	return NULL;
+}
+
+/**
+ *	ata_dev_phys_link - find physical link for a device
+ *	@dev: ATA device to look up physical link for
+ *
+ *	Look up physical link which @dev is attached to.  Note that
+ *	this is different from @dev->link only when @dev is on slave
+ *	link.  For all other cases, it's the same as @dev->link.
+ *
+ *	LOCKING:
+ *	Don't care.
+ *
+ *	RETURNS:
+ *	Pointer to the found physical link.
+ */
+struct ata_link *ata_dev_phys_link(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->link->ap;
+
+	if (!ap->slave_link)
+		return dev->link;
+	if (!dev->devno)
+		return &ap->link;
+	return ap->slave_link;
+}
+
+/**
+ *	ata_force_cbl - force cable type according to libata.force
+ *	@ap: ATA port of interest
+ *
+ *	Force cable type according to libata.force and whine about it.
+ *	The last entry which has matching port number is used, so it
+ *	can be specified as part of device force parameters.  For
+ *	example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
+ *	same effect.
+ *
+ *	LOCKING:
+ *	EH context.
+ */
+void ata_force_cbl(struct ata_port *ap)
+{
+	int i;
+
+	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
+		const struct ata_force_ent *fe = &ata_force_tbl[i];
+
+		if (fe->port != -1 && fe->port != ap->print_id)
+			continue;
+
+		if (fe->param.cbl == ATA_CBL_NONE)
+			continue;
+
+		ap->cbl = fe->param.cbl;
+		ata_port_printk(ap, KERN_NOTICE,
+				"FORCE: cable set to %s\n", fe->param.name);
+		return;
+	}
+}
+
+/**
+ *	ata_force_link_limits - force link limits according to libata.force
+ *	@link: ATA link of interest
+ *
+ *	Force link flags and SATA spd limit according to libata.force
+ *	and whine about it.  When only the port part is specified
+ *	(e.g. 1:), the limit applies to all links connected to both
+ *	the host link and all fan-out ports connected via PMP.  If the
+ *	device part is specified as 0 (e.g. 1.00:), it specifies the
+ *	first fan-out link not the host link.  Device number 15 always
+ *	points to the host link whether PMP is attached or not.  If the
+ *	controller has slave link, device number 16 points to it.
+ *
+ *	LOCKING:
+ *	EH context.
+ */
+static void ata_force_link_limits(struct ata_link *link)
+{
+	bool did_spd = false;
+	int linkno = link->pmp;
+	int i;
+
+	if (ata_is_host_link(link))
+		linkno += 15;
+
+	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
+		const struct ata_force_ent *fe = &ata_force_tbl[i];
+
+		if (fe->port != -1 && fe->port != link->ap->print_id)
+			continue;
+
+		if (fe->device != -1 && fe->device != linkno)
+			continue;
+
+		/* only honor the first spd limit */
+		if (!did_spd && fe->param.spd_limit) {
+			link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
+			ata_link_printk(link, KERN_NOTICE,
+					"FORCE: PHY spd limit set to %s\n",
+					fe->param.name);
+			did_spd = true;
+		}
+
+		/* let lflags stack */
+		if (fe->param.lflags) {
+			link->flags |= fe->param.lflags;
+			ata_link_printk(link, KERN_NOTICE,
+					"FORCE: link flag 0x%x forced -> 0x%x\n",
+					fe->param.lflags, link->flags);
+		}
+	}
+}
+
+/**
+ *	ata_force_xfermask - force xfermask according to libata.force
+ *	@dev: ATA device of interest
+ *
+ *	Force xfer_mask according to libata.force and whine about it.
+ *	For consistency with link selection, device number 15 selects
+ *	the first device connected to the host link.
+ *
+ *	LOCKING:
+ *	EH context.
+ */
+static void ata_force_xfermask(struct ata_device *dev)
+{
+	int devno = dev->link->pmp + dev->devno;
+	int alt_devno = devno;
+	int i;
+
+	/* allow n.15/16 for devices attached to host port */
+	if (ata_is_host_link(dev->link))
+		alt_devno += 15;
+
+	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
+		const struct ata_force_ent *fe = &ata_force_tbl[i];
+		unsigned long pio_mask, mwdma_mask, udma_mask;
+
+		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
+			continue;
+
+		if (fe->device != -1 && fe->device != devno &&
+		    fe->device != alt_devno)
+			continue;
+
+		if (!fe->param.xfer_mask)
+			continue;
+
+		ata_unpack_xfermask(fe->param.xfer_mask,
+				    &pio_mask, &mwdma_mask, &udma_mask);
+		if (udma_mask)
+			dev->udma_mask = udma_mask;
+		else if (mwdma_mask) {
+			dev->udma_mask = 0;
+			dev->mwdma_mask = mwdma_mask;
+		} else {
+			dev->udma_mask = 0;
+			dev->mwdma_mask = 0;
+			dev->pio_mask = pio_mask;
+		}
+
+		ata_dev_printk(dev, KERN_NOTICE,
+			"FORCE: xfer_mask set to %s\n", fe->param.name);
+		return;
+	}
+}
+
+/**
+ *	ata_force_horkage - force horkage according to libata.force
+ *	@dev: ATA device of interest
+ *
+ *	Force horkage according to libata.force and whine about it.
+ *	For consistency with link selection, device number 15 selects
+ *	the first device connected to the host link.
+ *
+ *	LOCKING:
+ *	EH context.
+ */
+static void ata_force_horkage(struct ata_device *dev)
+{
+	int devno = dev->link->pmp + dev->devno;
+	int alt_devno = devno;
+	int i;
+
+	/* allow n.15/16 for devices attached to host port */
+	if (ata_is_host_link(dev->link))
+		alt_devno += 15;
+
+	for (i = 0; i < ata_force_tbl_size; i++) {
+		const struct ata_force_ent *fe = &ata_force_tbl[i];
+
+		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
+			continue;
+
+		if (fe->device != -1 && fe->device != devno &&
+		    fe->device != alt_devno)
+			continue;
+
+		if (!(~dev->horkage & fe->param.horkage_on) &&
+		    !(dev->horkage & fe->param.horkage_off))
+			continue;
+
+		dev->horkage |= fe->param.horkage_on;
+		dev->horkage &= ~fe->param.horkage_off;
+
+		ata_dev_printk(dev, KERN_NOTICE,
+			"FORCE: horkage modified (%s)\n", fe->param.name);
+	}
+}
+
+/**
+ *	atapi_cmd_type - Determine ATAPI command type from SCSI opcode
+ *	@opcode: SCSI opcode
+ *
+ *	Determine ATAPI command type from @opcode.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
+ */
+int atapi_cmd_type(u8 opcode)
+{
+	switch (opcode) {
+	case GPCMD_READ_10:
+	case GPCMD_READ_12:
+		return ATAPI_READ;
+
+	case GPCMD_WRITE_10:
+	case GPCMD_WRITE_12:
+	case GPCMD_WRITE_AND_VERIFY_10:
+		return ATAPI_WRITE;
+
+	case GPCMD_READ_CD:
+	case GPCMD_READ_CD_MSF:
+		return ATAPI_READ_CD;
+
+	case ATA_16:
+	case ATA_12:
+		if (atapi_passthru16)
+			return ATAPI_PASS_THRU;
+		/* fall thru */
+	default:
+		return ATAPI_MISC;
+	}
+}
+
+/**
+ *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
+ *	@tf: Taskfile to convert
+ *	@pmp: Port multiplier port
+ *	@is_cmd: This FIS is for command
+ *	@fis: Buffer into which data will output
+ *
+ *	Converts a standard ATA taskfile to a Serial ATA
+ *	FIS structure (Register - Host to Device).
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
+{
+	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 */
+
+	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
+ *
+ *	Converts a serial ATA FIS structure to a standard ATA taskfile.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
+{
+	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];
+}
+
+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,
+	0,
+	0,
+	0,
+	ATA_CMD_WRITE_MULTI_FUA_EXT,
+	/* pio */
+	ATA_CMD_PIO_READ,
+	ATA_CMD_PIO_WRITE,
+	ATA_CMD_PIO_READ_EXT,
+	ATA_CMD_PIO_WRITE_EXT,
+	0,
+	0,
+	0,
+	0,
+	/* dma */
+	ATA_CMD_READ,
+	ATA_CMD_WRITE,
+	ATA_CMD_READ_EXT,
+	ATA_CMD_WRITE_EXT,
+	0,
+	0,
+	0,
+	ATA_CMD_WRITE_FUA_EXT
+};
+
+/**
+ *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
+ *	@tf: command to examine and configure
+ *	@dev: device tf belongs to
+ *
+ *	Examine the device configuration and tf->flags to calculate
+ *	the proper read/write commands and protocol to use.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
+{
+	u8 cmd;
+
+	int index, fua, lba48, write;
+
+	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
+	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
+	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
+
+	if (dev->flags & ATA_DFLAG_PIO) {
+		tf->protocol = ATA_PROT_PIO;
+		index = dev->multi_count ? 0 : 8;
+	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
+		/* Unable to use DMA due to host limitation */
+		tf->protocol = ATA_PROT_PIO;
+		index = dev->multi_count ? 0 : 8;
+	} else {
+		tf->protocol = ATA_PROT_DMA;
+		index = 16;
+	}
+
+	cmd = ata_rw_cmds[index + fua + lba48 + write];
+	if (cmd) {
+		tf->command = cmd;
+		return 0;
+	}
+	return -1;
+}
+
+/**
+ *	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 |= (u64)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;
+}
+
+/**
+ *	ata_build_rw_tf - Build ATA taskfile for given read/write request
+ *	@tf: Target ATA taskfile
+ *	@dev: ATA device @tf belongs to
+ *	@block: Block address
+ *	@n_block: Number of blocks
+ *	@tf_flags: RW/FUA etc...
+ *	@tag: tag
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	Build ATA taskfile @tf for read/write request described by
+ *	@block, @n_block, @tf_flags and @tag on @dev.
+ *
+ *	RETURNS:
+ *
+ *	0 on success, -ERANGE if the request is too large for @dev,
+ *	-EINVAL if the request is invalid.
+ */
+int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
+		    u64 block, u32 n_block, unsigned int tf_flags,
+		    unsigned int tag)
+{
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf->flags |= tf_flags;
+
+	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
+		/* 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;
+}
+
+/**
+ *	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.
+ */
+unsigned long ata_pack_xfermask(unsigned long pio_mask,
+				unsigned long mwdma_mask,
+				unsigned long udma_mask)
+{
+	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
+		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
+		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
+}
+
+/**
+ *	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.
+ */
+void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
+			 unsigned long *mwdma_mask, unsigned long *udma_mask)
+{
+	if (pio_mask)
+		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
+	if (mwdma_mask)
+		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
+	if (udma_mask)
+		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
+}
+
+static const struct ata_xfer_ent {
+	int shift, bits;
+	u8 base;
+} ata_xfer_tbl[] = {
+	{ 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 },
+	{ -1, },
+};
+
+/**
+ *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
+ *	@xfer_mask: xfer_mask of interest
+ *
+ *	Return matching XFER_* value for @xfer_mask.  Only the highest
+ *	bit of @xfer_mask is considered.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Matching XFER_* value, 0xff if no match found.
+ */
+u8 ata_xfer_mask2mode(unsigned long xfer_mask)
+{
+	int highbit = fls(xfer_mask) - 1;
+	const struct ata_xfer_ent *ent;
+
+	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
+			return ent->base + highbit - ent->shift;
+	return 0xff;
+}
+
+/**
+ *	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.
+ */
+unsigned long ata_xfer_mode2mask(u8 xfer_mode)
+{
+	const struct ata_xfer_ent *ent;
+
+	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
+			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
+				& ~((1 << ent->shift) - 1);
+	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.
+ */
+int ata_xfer_mode2shift(unsigned long xfer_mode)
+{
+	const struct ata_xfer_ent *ent;
+
+	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
+			return ent->shift;
+	return -1;
+}
+
+/**
+ *	ata_mode_string - convert xfer_mask to string
+ *	@xfer_mask: mask of bits supported; only highest bit counts.
+ *
+ *	Determine string which represents the highest speed
+ *	(highest bit in @modemask).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Constant C string representing highest speed listed in
+ *	@mode_mask, or the constant C string "<n/a>".
+ */
+const char *ata_mode_string(unsigned long xfer_mask)
+{
+	static const char * const xfer_mode_str[] = {
+		"PIO0",
+		"PIO1",
+		"PIO2",
+		"PIO3",
+		"PIO4",
+		"PIO5",
+		"PIO6",
+		"MWDMA0",
+		"MWDMA1",
+		"MWDMA2",
+		"MWDMA3",
+		"MWDMA4",
+		"UDMA/16",
+		"UDMA/25",
+		"UDMA/33",
+		"UDMA/44",
+		"UDMA/66",
+		"UDMA/100",
+		"UDMA/133",
+		"UDMA7",
+	};
+	int highbit;
+
+	highbit = fls(xfer_mask) - 1;
+	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
+		return xfer_mode_str[highbit];
+	return "<n/a>";
+}
+
+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];
+}
+
+void ata_dev_disable(struct ata_device *dev)
+{
+	if (ata_dev_enabled(dev)) {
+		if (ata_msg_drv(dev->link->ap))
+			ata_dev_printk(dev, KERN_WARNING, "disabled\n");
+		ata_acpi_on_disable(dev);
+		ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 |
+					     ATA_DNXFER_QUIET);
+		dev->class++;
+	}
+}
+
+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;
+
+		/*
+		 * we don't have to disable DIPM since IPM flags
+		 * disallow transitions to SLUMBER, which effectively
+		 * disable DIPM if it does not support PARTIAL
+		 */
+		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;
+
+		/*
+		 * we don't have to disable DIPM since IPM flags
+		 * disallow all transitions which effectively
+		 * disable DIPM anyway.
+		 */
+		break;
+	}
+
+	/* FIXME: handle SET FEATURES failure */
+	(void) err_mask;
+
+	return 0;
+}
+
+/**
+ *	ata_dev_enable_pm - enable SATA interface power management
+ *	@dev:  device to enable power management
+ *	@policy: the link power management policy
+ *
+ *	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 */
+}
+
+#ifdef CONFIG_PM
+/**
+ *	ata_dev_disable_pm - disable SATA interface power management
+ *	@dev: device to disable power management
+ *
+ *	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);
+}
+#endif	/* CONFIG_PM */
+
+void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
+{
+	ap->pm_policy = policy;
+	ap->link.eh_info.action |= ATA_EH_LPM;
+	ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
+	ata_port_schedule_eh(ap);
+}
+
+#ifdef CONFIG_PM
+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);
+	}
+}
+#endif	/* CONFIG_PM */
+
+/**
+ *	ata_dev_classify - determine device type based on ATA-spec signature
+ *	@tf: ATA taskfile register set for device to be identified
+ *
+ *	Determine from taskfile register contents whether a device is
+ *	ATA or ATAPI, as per "Signature and persistence" section
+ *	of ATA/PI spec (volume 1, sect 5.14).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
+ *	%ATA_DEV_UNKNOWN the event of failure.
+ */
+unsigned int ata_dev_classify(const struct ata_taskfile *tf)
+{
+	/* 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.
+	 *
+	 * 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.
+	 */
+	if ((tf->lbam == 0) && (tf->lbah == 0)) {
+		DPRINTK("found ATA device by sig\n");
+		return ATA_DEV_ATA;
+	}
+
+	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
+		DPRINTK("found ATAPI device by sig\n");
+		return ATA_DEV_ATAPI;
+	}
+
+	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)) {
+		printk(KERN_INFO "ata: SEMB device ignored\n");
+		return ATA_DEV_SEMB_UNSUP; /* not yet */
+	}
+
+	DPRINTK("unknown device\n");
+	return ATA_DEV_UNKNOWN;
+}
+
+/**
+ *	ata_id_string - Convert IDENTIFY DEVICE page into string
+ *	@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.
+ */
+
+void ata_id_string(const u16 *id, unsigned char *s,
+		   unsigned int ofs, unsigned int len)
+{
+	unsigned int c;
+
+	BUG_ON(len & 1);
+
+	while (len > 0) {
+		c = id[ofs] >> 8;
+		*s = c;
+		s++;
+
+		c = id[ofs] & 0xff;
+		*s = c;
+		s++;
+
+		ofs++;
+		len -= 2;
+	}
+}
+
+/**
+ *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
+ *	@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.
+ *
+ *	This function is identical to ata_id_string except that it
+ *	trims trailing spaces and terminates the resulting string with
+ *	null.  @len must be actual maximum length (even number) + 1.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+void ata_id_c_string(const u16 *id, unsigned char *s,
+		     unsigned int ofs, unsigned int len)
+{
+	unsigned char *p;
+
+	ata_id_string(id, s, ofs, len - 1);
+
+	p = s + strnlen(s, len - 1);
+	while (p > s && p[-1] == ' ')
+		p--;
+	*p = '\0';
+}
+
+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, ATA_ID_LBA_CAPACITY_2);
+		else
+			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
+	} else {
+		if (ata_id_current_chs_valid(id))
+			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
+			       id[ATA_ID_CUR_SECTORS];
+		else
+			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
+			       id[ATA_ID_SECTORS];
+	}
+}
+
+u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
+{
+	u64 sectors = 0;
+
+	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
+	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
+	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
+	sectors |= (tf->lbah & 0xff) << 16;
+	sectors |= (tf->lbam & 0xff) << 8;
+	sectors |= (tf->lbal & 0xff);
+
+	return sectors;
+}
+
+u64 ata_tf_to_lba(const struct ata_taskfile *tf)
+{
+	u64 sectors = 0;
+
+	sectors |= (tf->device & 0x0f) << 24;
+	sectors |= (tf->lbah & 0xff) << 16;
+	sectors |= (tf->lbam & 0xff) << 8;
+	sectors |= (tf->lbal & 0xff);
+
+	return sectors;
+}
+
+/**
+ *	ata_read_native_max_address - Read native max address
+ *	@dev: target device
+ *	@max_sectors: out parameter for the result native max address
+ *
+ *	Perform an LBA48 or LBA28 native size query upon the device in
+ *	question.
+ *
+ *	RETURNS:
+ *	0 on success, -EACCES if command is aborted by the drive.
+ *	-EIO on other errors.
+ */
+static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
+{
+	unsigned int err_mask;
+	struct ata_taskfile tf;
+	int lba48 = ata_id_has_lba48(dev->id);
+
+	ata_tf_init(dev, &tf);
+
+	/* always clear all address registers */
+	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+
+	if (lba48) {
+		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
+		tf.flags |= ATA_TFLAG_LBA48;
+	} else
+		tf.command = ATA_CMD_READ_NATIVE_MAX;
+
+	tf.protocol |= ATA_PROT_NODATA;
+	tf.device |= ATA_LBA;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+	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;
+	}
+
+	if (lba48)
+		*max_sectors = ata_tf_to_lba48(&tf) + 1;
+	else
+		*max_sectors = ata_tf_to_lba(&tf) + 1;
+	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
+		(*max_sectors)--;
+	return 0;
+}
+
+/**
+ *	ata_set_max_sectors - Set max sectors
+ *	@dev: target device
+ *	@new_sectors: new max sectors value to set for the device
+ *
+ *	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.
+ */
+static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
+{
+	unsigned int err_mask;
+	struct ata_taskfile tf;
+	int lba48 = ata_id_has_lba48(dev->id);
+
+	new_sectors--;
+
+	ata_tf_init(dev, &tf);
+
+	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+
+	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;
+	} else {
+		tf.command = ATA_CMD_SET_MAX;
+
+		tf.device |= (new_sectors >> 24) & 0xf;
+	}
+
+	tf.protocol |= ATA_PROT_NODATA;
+	tf.device |= ATA_LBA;
+
+	tf.lbal = (new_sectors >> 0) & 0xff;
+	tf.lbam = (new_sectors >> 8) & 0xff;
+	tf.lbah = (new_sectors >> 16) & 0xff;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+	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;
+}
+
+/**
+ *	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.
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int ata_hpa_resize(struct ata_device *dev)
+{
+	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;
+	int rc;
+
+	/* 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))
+		return 0;
+
+	/* read native max address */
+	rc = ata_read_native_max_address(dev, &native_sectors);
+	if (rc) {
+		/* If device aborted the command or HPA isn't going to
+		 * be unlocked, skip HPA resizing.
+		 */
+		if (rc == -EACCES || !ata_ignore_hpa) {
+			ata_dev_printk(dev, KERN_WARNING, "HPA support seems "
+				       "broken, skipping HPA handling\n");
+			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
+
+			/* we can continue if device aborted the command */
+			if (rc == -EACCES)
+				rc = 0;
+		}
+
+		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;
+}
+
+/**
+ *	ata_dump_id - IDENTIFY DEVICE info debugging output
+ *	@id: IDENTIFY DEVICE page to dump
+ *
+ *	Dump selected 16-bit words from the given IDENTIFY DEVICE
+ *	page.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static inline void ata_dump_id(const u16 *id)
+{
+	DPRINTK("49==0x%04x  "
+		"53==0x%04x  "
+		"63==0x%04x  "
+		"64==0x%04x  "
+		"75==0x%04x  \n",
+		id[49],
+		id[53],
+		id[63],
+		id[64],
+		id[75]);
+	DPRINTK("80==0x%04x  "
+		"81==0x%04x  "
+		"82==0x%04x  "
+		"83==0x%04x  "
+		"84==0x%04x  \n",
+		id[80],
+		id[81],
+		id[82],
+		id[83],
+		id[84]);
+	DPRINTK("88==0x%04x  "
+		"93==0x%04x\n",
+		id[88],
+		id[93]);
+}
+
+/**
+ *	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
+ */
+unsigned long ata_id_xfermask(const u16 *id)
+{
+	unsigned long pio_mask, mwdma_mask, udma_mask;
+
+	/* Usual case. Word 53 indicates word 64 is valid */
+	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
+		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
+		pio_mask <<= 3;
+		pio_mask |= 0x7;
+	} else {
+		/* If word 64 isn't valid then Word 51 high byte holds
+		 * the PIO timing number for the maximum. Turn it into
+		 * a mask.
+		 */
+		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
+		if (mode < 5)	/* Valid PIO range */
+			pio_mask = (2 << mode) - 1;
+		else
+			pio_mask = 1;
+
+		/* 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;
+
+	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);
+	}
+
+	udma_mask = 0;
+	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
+		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
+
+	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
+}
+
+/**
+ *	ata_pio_queue_task - Queue port_task
+ *	@ap: The ata_port to queue port_task for
+ *	@data: data for @fn to use
+ *	@delay: delay time in msecs for workqueue function
+ *
+ *	Schedule @fn(@data) for execution after @delay jiffies using
+ *	port_task.  There is one port_task per port and it's the
+ *	user(low level driver)'s responsibility to make sure that only
+ *	one task is active at any given time.
+ *
+ *	libata core layer takes care of synchronization between
+ *	port_task and EH.  ata_pio_queue_task() may be ignored for EH
+ *	synchronization.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
+{
+	ap->port_task_data = data;
+
+	/* may fail if ata_port_flush_task() in progress */
+	queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
+}
+
+/**
+ *	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");
+
+	cancel_rearming_delayed_work(&ap->port_task);
+
+	if (ata_msg_ctl(ap))
+		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
+}
+
+static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
+{
+	struct completion *waiting = qc->private_data;
+
+	complete(waiting);
+}
+
+/**
+ *	ata_exec_internal_sg - execute libata internal command
+ *	@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
+ *	@sgl: sg list for the data buffer of the command
+ *	@n_elem: Number of sg entries
+ *	@timeout: Timeout in msecs (0 for default)
+ *
+ *	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.
+ *
+ *	RETURNS:
+ *	Zero on success, AC_ERR_* mask on failure
+ */
+unsigned ata_exec_internal_sg(struct ata_device *dev,
+			      struct ata_taskfile *tf, const u8 *cdb,
+			      int dma_dir, struct scatterlist *sgl,
+			      unsigned int n_elem, unsigned long timeout)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = link->ap;
+	u8 command = tf->command;
+	int auto_timeout = 0;
+	struct ata_queued_cmd *qc;
+	unsigned int tag, preempted_tag;
+	u32 preempted_sactive, preempted_qc_active;
+	int preempted_nr_active_links;
+	DECLARE_COMPLETION_ONSTACK(wait);
+	unsigned long flags;
+	unsigned int err_mask;
+	int rc;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* no internal command while frozen */
+	if (ap->pflags & ATA_PFLAG_FROZEN) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		return AC_ERR_SYSTEM;
+	}
+
+	/* initialize internal qc */
+
+	/* 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;
+
+	if (test_and_set_bit(tag, &ap->qc_allocated))
+		BUG();
+	qc = __ata_qc_from_tag(ap, tag);
+
+	qc->tag = tag;
+	qc->scsicmd = NULL;
+	qc->ap = ap;
+	qc->dev = dev;
+	ata_qc_reinit(qc);
+
+	preempted_tag = link->active_tag;
+	preempted_sactive = link->sactive;
+	preempted_qc_active = ap->qc_active;
+	preempted_nr_active_links = ap->nr_active_links;
+	link->active_tag = ATA_TAG_POISON;
+	link->sactive = 0;
+	ap->qc_active = 0;
+	ap->nr_active_links = 0;
+
+	/* prepare & issue qc */
+	qc->tf = *tf;
+	if (cdb)
+		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
+	qc->dma_dir = dma_dir;
+	if (dma_dir != DMA_NONE) {
+		unsigned int i, buflen = 0;
+		struct scatterlist *sg;
+
+		for_each_sg(sgl, sg, n_elem, i)
+			buflen += sg->length;
+
+		ata_sg_init(qc, sgl, n_elem);
+		qc->nbytes = buflen;
+	}
+
+	qc->private_data = &wait;
+	qc->complete_fn = ata_qc_complete_internal;
+
+	ata_qc_issue(qc);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	if (!timeout) {
+		if (ata_probe_timeout)
+			timeout = ata_probe_timeout * 1000;
+		else {
+			timeout = ata_internal_cmd_timeout(dev, command);
+			auto_timeout = 1;
+		}
+	}
+
+	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
+
+	ata_port_flush_task(ap);
+
+	if (!rc) {
+		spin_lock_irqsave(ap->lock, flags);
+
+		/* We're racing with irq here.  If we lose, the
+		 * following test prevents us from completing the qc
+		 * twice.  If we win, the port is frozen and will be
+		 * cleaned up by ->post_internal_cmd().
+		 */
+		if (qc->flags & ATA_QCFLAG_ACTIVE) {
+			qc->err_mask |= AC_ERR_TIMEOUT;
+
+			if (ap->ops->error_handler)
+				ata_port_freeze(ap);
+			else
+				ata_qc_complete(qc);
+
+			if (ata_msg_warn(ap))
+				ata_dev_printk(dev, KERN_WARNING,
+					"qc timeout (cmd 0x%x)\n", command);
+		}
+
+		spin_unlock_irqrestore(ap->lock, flags);
+	}
+
+	/* do post_internal_cmd */
+	if (ap->ops->post_internal_cmd)
+		ap->ops->post_internal_cmd(qc);
+
+	/* 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;
+	}
+
+	/* finish up */
+	spin_lock_irqsave(ap->lock, flags);
+
+	*tf = qc->result_tf;
+	err_mask = qc->err_mask;
+
+	ata_qc_free(qc);
+	link->active_tag = preempted_tag;
+	link->sactive = preempted_sactive;
+	ap->qc_active = preempted_qc_active;
+	ap->nr_active_links = preempted_nr_active_links;
+
+	/* 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.
+	 */
+	if (ap->flags & ATA_FLAG_DISABLED) {
+		err_mask |= AC_ERR_SYSTEM;
+		ata_port_probe(ap);
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
+		ata_internal_cmd_timed_out(dev, command);
+
+	return err_mask;
+}
+
+/**
+ *	ata_exec_internal - execute libata internal command
+ *	@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
+ *	@timeout: Timeout in msecs (0 for default)
+ *
+ *	Wrapper around ata_exec_internal_sg() which takes simple
+ *	buffer instead of sg list.
+ *
+ *	LOCKING:
+ *	None.  Should be called with kernel context, might sleep.
+ *
+ *	RETURNS:
+ *	Zero on success, AC_ERR_* mask on failure
+ */
+unsigned ata_exec_internal(struct ata_device *dev,
+			   struct ata_taskfile *tf, const u8 *cdb,
+			   int dma_dir, void *buf, unsigned int buflen,
+			   unsigned long timeout)
+{
+	struct scatterlist *psg = NULL, sg;
+	unsigned int n_elem = 0;
+
+	if (dma_dir != DMA_NONE) {
+		WARN_ON(!buf);
+		sg_init_one(&sg, buf, buflen);
+		psg = &sg;
+		n_elem++;
+	}
+
+	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
+				    timeout);
+}
+
+/**
+ *	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
+ */
+unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
+{
+	struct ata_taskfile tf;
+
+	ata_tf_init(dev, &tf);
+
+	tf.command = cmd;
+	tf.flags |= ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+
+	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+}
+
+/**
+ *	ata_pio_need_iordy	-	check if iordy needed
+ *	@adev: ATA device
+ *
+ *	Check if the current speed of the device requires IORDY. Used
+ *	by various controllers for chip configuration.
+ */
+
+unsigned int ata_pio_need_iordy(const struct ata_device *adev)
+{
+	/* Controller doesn't support  IORDY. Probably a pointless check
+	   as the caller should know this */
+	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
+		return 0;
+	/* 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))
+		return 1;
+	return 0;
+}
+
+/**
+ *	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.
+ */
+
+static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
+{
+	/* If we have no drive specific rule, then PIO 2 is non IORDY */
+	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
+		u16 pio = adev->id[ATA_ID_EIDE_PIO];
+		/* Is the speed faster than the drive allows non IORDY ? */
+		if (pio) {
+			/* This is cycle times not frequency - watch the logic! */
+			if (pio > 240)	/* PIO2 is 240nS per cycle */
+				return 3 << ATA_SHIFT_PIO;
+			return 7 << ATA_SHIFT_PIO;
+		}
+	}
+	return 3 << ATA_SHIFT_PIO;
+}
+
+/**
+ *	ata_do_dev_read_id		-	default ID read method
+ *	@dev: device
+ *	@tf: proposed taskfile
+ *	@id: data buffer
+ *
+ *	Issue the identify taskfile and hand back the buffer containing
+ *	identify data. For some RAID controllers and for pre ATA devices
+ *	this function is wrapped or replaced by the driver
+ */
+unsigned int ata_do_dev_read_id(struct ata_device *dev,
+					struct ata_taskfile *tf, u16 *id)
+{
+	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
+				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
+}
+
+/**
+ *	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)
+ *	@flags: ATA_READID_* flags
+ *	@id: buffer to read IDENTIFY data into
+ *
+ *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
+ *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
+ *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
+ *	for pre-ATA4 drives.
+ *
+ *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
+ *	now we abort if we hit that case.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+		    unsigned int flags, u16 *id)
+{
+	struct ata_port *ap = dev->link->ap;
+	unsigned int class = *p_class;
+	struct ata_taskfile tf;
+	unsigned int err_mask = 0;
+	const char *reason;
+	int may_fallback = 1, tried_spinup = 0;
+	int rc;
+
+	if (ata_msg_ctl(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
+
+retry:
+	ata_tf_init(dev, &tf);
+
+	switch (class) {
+	case ATA_DEV_ATA:
+		tf.command = ATA_CMD_ID_ATA;
+		break;
+	case ATA_DEV_ATAPI:
+		tf.command = ATA_CMD_ID_ATAPI;
+		break;
+	default:
+		rc = -ENODEV;
+		reason = "unsupported class";
+		goto err_out;
+	}
+
+	tf.protocol = ATA_PROT_PIO;
+
+	/* 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;
+
+	if (ap->ops->read_id)
+		err_mask = ap->ops->read_id(dev, &tf, id);
+	else
+		err_mask = ata_do_dev_read_id(dev, &tf, id);
+
+	if (err_mask) {
+		if (err_mask & AC_ERR_NODEV_HINT) {
+			ata_dev_printk(dev, KERN_DEBUG,
+				       "NODEV after polling detection\n");
+			return -ENOENT;
+		}
+
+		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
+			/* 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) {
+				may_fallback = 0;
+
+				if (class == ATA_DEV_ATA)
+					class = ATA_DEV_ATAPI;
+				else
+					class = ATA_DEV_ATA;
+				goto retry;
+			}
+
+			/* Control reaches here iff the device aborted
+			 * both flavors of IDENTIFYs which happens
+			 * sometimes with phantom devices.
+			 */
+			ata_dev_printk(dev, KERN_DEBUG,
+				       "both IDENTIFYs aborted, assuming NODEV\n");
+			return -ENOENT;
+		}
+
+		rc = -EIO;
+		reason = "I/O error";
+		goto err_out;
+	}
+
+	/* Falling back doesn't make sense if ID data was read
+	 * successfully at least once.
+	 */
+	may_fallback = 0;
+
+	swap_buf_le16(id, ATA_ID_WORDS);
+
+	/* sanity check */
+	rc = -EINVAL;
+	reason = "device reports invalid type";
+
+	if (class == ATA_DEV_ATA) {
+		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
+			goto err_out;
+	} else {
+		if (ata_id_is_ata(id))
+			goto err_out;
+	}
+
+	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.
+		 */
+		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
+		if (err_mask && id[2] != 0x738c) {
+			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;
+	}
+
+	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
+		/*
+		 * The exact sequence expected by certain pre-ATA4 drives is:
+		 * SRST RESET
+		 * IDENTIFY (optional in early ATA)
+		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
+		 * anything else..
+		 * Some drives were very specific about that exact sequence.
+		 *
+		 * Note that ATA4 says lba is mandatory so the second check
+		 * shoud never trigger.
+		 */
+		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
+			err_mask = ata_dev_init_params(dev, id[3], id[6]);
+			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.
+			 */
+			flags &= ~ATA_READID_POSTRESET;
+			goto retry;
+		}
+	}
+
+	*p_class = class;
+
+	return 0;
+
+ err_out:
+	if (ata_msg_warn(ap))
+		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
+			       "(%s, err_mask=0x%x)\n", reason, err_mask);
+	return rc;
+}
+
+static inline u8 ata_dev_knobble(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->link->ap;
+
+	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
+		return 0;
+
+	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
+}
+
+static void ata_dev_config_ncq(struct ata_device *dev,
+			       char *desc, size_t desc_sz)
+{
+	struct ata_port *ap = dev->link->ap;
+	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
+
+	if (!ata_id_has_ncq(dev->id)) {
+		desc[0] = '\0';
+		return;
+	}
+	if (dev->horkage & ATA_HORKAGE_NONCQ) {
+		snprintf(desc, desc_sz, "NCQ (not used)");
+		return;
+	}
+	if (ap->flags & ATA_FLAG_NCQ) {
+		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
+		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);
+}
+
+/**
+ *	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.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise
+ */
+int ata_dev_configure(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->link->ap;
+	struct ata_eh_context *ehc = &dev->link->eh_context;
+	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
+	const u16 *id = dev->id;
+	unsigned long xfer_mask;
+	char revbuf[7];		/* XYZ-99\0 */
+	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
+	char modelbuf[ATA_ID_PROD_LEN+1];
+	int rc;
+
+	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
+		ata_dev_printk(dev, KERN_INFO, "%s: ENTER/EXIT -- nodev\n",
+			       __func__);
+		return 0;
+	}
+
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __func__);
+
+	/* set horkage */
+	dev->horkage |= ata_dev_blacklisted(dev);
+	ata_force_horkage(dev);
+
+	if (dev->horkage & ATA_HORKAGE_DISABLE) {
+		ata_dev_printk(dev, KERN_INFO,
+			       "unsupported device, disabling\n");
+		ata_dev_disable(dev);
+		return 0;
+	}
+
+	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
+	    dev->class == ATA_DEV_ATAPI) {
+		ata_dev_printk(dev, KERN_WARNING,
+			"WARNING: ATAPI is %s, device ignored.\n",
+			atapi_enabled ? "not supported with this driver"
+				      : "disabled");
+		ata_dev_disable(dev);
+		return 0;
+	}
+
+	/* let ACPI work its magic */
+	rc = ata_acpi_on_devcfg(dev);
+	if (rc)
+		return rc;
+
+	/* massage HPA, do it early as it might change IDENTIFY data */
+	rc = ata_hpa_resize(dev);
+	if (rc)
+		return rc;
+
+	/* print device capabilities */
+	if (ata_msg_probe(ap))
+		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",
+			       __func__,
+			       id[49], id[82], id[83], id[84],
+			       id[85], id[86], id[87], id[88]);
+
+	/* initialize to-be-configured parameters */
+	dev->flags &= ~ATA_DFLAG_CFG_MASK;
+	dev->max_sectors = 0;
+	dev->cdb_len = 0;
+	dev->n_sectors = 0;
+	dev->cylinders = 0;
+	dev->heads = 0;
+	dev->sectors = 0;
+
+	/*
+	 * common ATA, ATAPI feature tests
+	 */
+
+	/* find max transfer mode; for printk only */
+	xfer_mask = ata_id_xfermask(id);
+
+	if (ata_msg_probe(ap))
+		ata_dump_id(id);
+
+	/* 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));
+
+	/* ATA-specific feature tests */
+	if (dev->class == ATA_DEV_ATA) {
+		if (ata_id_is_cfa(id)) {
+			if (id[162] & 1) /* CPRM may make this media unusable */
+				ata_dev_printk(dev, KERN_WARNING,
+					       "supports DRM functions and may "
+					       "not be fully accessable.\n");
+			snprintf(revbuf, 7, "CFA");
+		} else {
+			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
+			/* 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");
+		}
+
+		dev->n_sectors = ata_id_n_sectors(id);
+
+		if (dev->id[59] & 0x100)
+			dev->multi_count = dev->id[59] & 0xff;
+
+		if (ata_id_has_lba(id)) {
+			const char *lba_desc;
+			char ncq_desc[20];
+
+			lba_desc = "LBA";
+			dev->flags |= ATA_DFLAG_LBA;
+			if (ata_id_has_lba48(id)) {
+				dev->flags |= ATA_DFLAG_LBA48;
+				lba_desc = "LBA48";
+
+				if (dev->n_sectors >= (1UL << 28) &&
+				    ata_id_has_flush_ext(id))
+					dev->flags |= ATA_DFLAG_FLUSH_EXT;
+			}
+
+			/* config NCQ */
+			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
+
+			/* print device info to dmesg */
+			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",
+					(unsigned long long)dev->n_sectors,
+					dev->multi_count, lba_desc, ncq_desc);
+			}
+		} else {
+			/* CHS */
+
+			/* Default translation */
+			dev->cylinders	= id[1];
+			dev->heads	= id[3];
+			dev->sectors	= id[6];
+
+			if (ata_id_current_chs_valid(id)) {
+				/* Current CHS translation is valid. */
+				dev->cylinders = id[54];
+				dev->heads     = id[55];
+				dev->sectors   = id[56];
+			}
+
+			/* print device info to dmesg */
+			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, CHS %u/%u/%u\n",
+					(unsigned long long)dev->n_sectors,
+					dev->multi_count, dev->cylinders,
+					dev->heads, dev->sectors);
+			}
+		}
+
+		dev->cdb_len = 16;
+	}
+
+	/* ATAPI-specific feature tests */
+	else if (dev->class == ATA_DEV_ATAPI) {
+		const char *cdb_intr_string = "";
+		const char *atapi_an_string = "";
+		const char *dma_dir_string = "";
+		u32 sntf;
+
+		rc = atapi_cdb_len(id);
+		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
+			if (ata_msg_warn(ap))
+				ata_dev_printk(dev, KERN_WARNING,
+					       "unsupported CDB len\n");
+			rc = -EINVAL;
+			goto err_out_nosup;
+		}
+		dev->cdb_len = (unsigned int) rc;
+
+		/* 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.
+		 */
+		if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
+		    (!sata_pmp_attached(ap) ||
+		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
+			unsigned int err_mask;
+
+			/* issue SET feature command to turn this on */
+			err_mask = ata_dev_set_feature(dev,
+					SETFEATURES_SATA_ENABLE, SATA_AN);
+			if (err_mask)
+				ata_dev_printk(dev, KERN_ERR,
+					"failed to enable ATAPI AN "
+					"(err_mask=0x%x)\n", err_mask);
+			else {
+				dev->flags |= ATA_DFLAG_AN;
+				atapi_an_string = ", ATAPI AN";
+			}
+		}
+
+		if (ata_id_cdb_intr(dev->id)) {
+			dev->flags |= ATA_DFLAG_CDB_INTR;
+			cdb_intr_string = ", CDB intr";
+		}
+
+		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
+			dev->flags |= ATA_DFLAG_DMADIR;
+			dma_dir_string = ", DMADIR";
+		}
+
+		/* print device info to dmesg */
+		if (ata_msg_drv(ap) && print_info)
+			ata_dev_printk(dev, KERN_INFO,
+				       "ATAPI: %s, %s, max %s%s%s%s\n",
+				       modelbuf, fwrevbuf,
+				       ata_mode_string(xfer_mask),
+				       cdb_intr_string, atapi_an_string,
+				       dma_dir_string);
+	}
+
+	/* determine max_sectors */
+	dev->max_sectors = ATA_MAX_SECTORS;
+	if (dev->flags & ATA_DFLAG_LBA48)
+		dev->max_sectors = ATA_MAX_SECTORS_LBA48;
+
+	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;
+	}
+
+	/* Limit PATA drive on SATA cable bridge transfers to udma5,
+	   200 sectors */
+	if (ata_dev_knobble(dev)) {
+		if (ata_msg_drv(ap) && print_info)
+			ata_dev_printk(dev, KERN_INFO,
+				       "applying bridge limits\n");
+		dev->udma_mask &= ATA_UDMA5;
+		dev->max_sectors = ATA_MAX_SECTORS;
+	}
+
+	if ((dev->class == ATA_DEV_ATAPI) &&
+	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
+		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
+		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
+	}
+
+	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
+		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
+					 dev->max_sectors);
+
+	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;
+	}
+
+	if (ap->ops->dev_config)
+		ap->ops->dev_config(dev);
+
+	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");
+		}
+	}
+
+	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
+		ata_dev_printk(dev, KERN_WARNING, "WARNING: device requires "
+			       "firmware update to be fully functional.\n");
+		ata_dev_printk(dev, KERN_WARNING, "         contact the vendor "
+			       "or visit http://ata.wiki.kernel.org.\n");
+	}
+
+	return 0;
+
+err_out_nosup:
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG,
+			       "%s: EXIT, err\n", __func__);
+	return rc;
+}
+
+/**
+ *	ata_cable_40wire	-	return 40 wire cable type
+ *	@ap: port
+ *
+ *	Helper method for drivers which want to hardwire 40 wire cable
+ *	detection.
+ */
+
+int ata_cable_40wire(struct ata_port *ap)
+{
+	return ATA_CBL_PATA40;
+}
+
+/**
+ *	ata_cable_80wire	-	return 80 wire cable type
+ *	@ap: port
+ *
+ *	Helper method for drivers which want to hardwire 80 wire cable
+ *	detection.
+ */
+
+int ata_cable_80wire(struct ata_port *ap)
+{
+	return ATA_CBL_PATA80;
+}
+
+/**
+ *	ata_cable_unknown	-	return unknown PATA cable.
+ *	@ap: port
+ *
+ *	Helper method for drivers which have no PATA cable detection.
+ */
+
+int ata_cable_unknown(struct ata_port *ap)
+{
+	return ATA_CBL_PATA_UNK;
+}
+
+/**
+ *	ata_cable_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;
+}
+
+/**
+ *	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;
+}
+
+/**
+ *	ata_bus_probe - Reset and probe ATA bus
+ *	@ap: Bus to probe
+ *
+ *	Master ATA bus probing function.  Initiates a hardware-dependent
+ *	bus reset, then attempts to identify any devices found on
+ *	the bus.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno otherwise.
+ */
+
+int ata_bus_probe(struct ata_port *ap)
+{
+	unsigned int classes[ATA_MAX_DEVICES];
+	int tries[ATA_MAX_DEVICES];
+	int rc;
+	struct ata_device *dev;
+
+	ata_port_probe(ap);
+
+	ata_link_for_each_dev(dev, &ap->link)
+		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
+
+ retry:
+	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);
+	}
+
+	/* reset and determine device classes */
+	ap->ops->phy_reset(ap);
+
+	ata_link_for_each_dev(dev, &ap->link) {
+		if (!(ap->flags & ATA_FLAG_DISABLED) &&
+		    dev->class != ATA_DEV_UNKNOWN)
+			classes[dev->devno] = dev->class;
+		else
+			classes[dev->devno] = ATA_DEV_NONE;
+
+		dev->class = ATA_DEV_UNKNOWN;
+	}
+
+	ata_port_probe(ap);
+
+	/* 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 */
+
+	ata_link_for_each_dev_reverse(dev, &ap->link) {
+		if (tries[dev->devno])
+			dev->class = classes[dev->devno];
+
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
+				     dev->id);
+		if (rc)
+			goto fail;
+	}
+
+	/* Now ask for the cable type as PDIAG- should have been released */
+	if (ap->ops->cable_detect)
+		ap->cbl = ap->ops->cable_detect(ap);
+
+	/* 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;
+	}
+
+	/* 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 */
+
+	ata_link_for_each_dev(dev, &ap->link) {
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
+		rc = ata_dev_configure(dev);
+		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
+		if (rc)
+			goto fail;
+	}
+
+	/* configure transfer mode */
+	rc = ata_set_mode(&ap->link, &dev);
+	if (rc)
+		goto fail;
+
+	ata_link_for_each_dev(dev, &ap->link)
+		if (ata_dev_enabled(dev))
+			return 0;
+
+	/* no device present, disable port */
+	ata_port_disable(ap);
+	return -ENODEV;
+
+ fail:
+	tries[dev->devno]--;
+
+	switch (rc) {
+	case -EINVAL:
+		/* eeek, something went very wrong, give up */
+		tries[dev->devno] = 0;
+		break;
+
+	case -ENODEV:
+		/* give it just one more chance */
+		tries[dev->devno] = min(tries[dev->devno], 1);
+	case -EIO:
+		if (tries[dev->devno] == 1) {
+			/* This is the last chance, better to slow
+			 * down than lose it.
+			 */
+			sata_down_spd_limit(&ap->link);
+			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
+		}
+	}
+
+	if (!tries[dev->devno])
+		ata_dev_disable(dev);
+
+	goto retry;
+}
+
+/**
+ *	ata_port_probe - Mark port as enabled
+ *	@ap: Port for which we indicate enablement
+ *
+ *	Modify @ap data structure such that the system
+ *	thinks that the entire port is enabled.
+ *
+ *	LOCKING: host lock, or some other form of
+ *	serialization.
+ */
+
+void ata_port_probe(struct ata_port *ap)
+{
+	ap->flags &= ~ATA_FLAG_DISABLED;
+}
+
+/**
+ *	sata_print_link_status - Print SATA link status
+ *	@link: SATA link to printk link status about
+ *
+ *	This function prints link speed and status of a SATA link.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void sata_print_link_status(struct ata_link *link)
+{
+	u32 sstatus, scontrol, tmp;
+
+	if (sata_scr_read(link, SCR_STATUS, &sstatus))
+		return;
+	sata_scr_read(link, SCR_CONTROL, &scontrol);
+
+	if (ata_phys_link_online(link)) {
+		tmp = (sstatus >> 4) & 0xf;
+		ata_link_printk(link, KERN_INFO,
+				"SATA link up %s (SStatus %X SControl %X)\n",
+				sata_spd_string(tmp), sstatus, scontrol);
+	} else {
+		ata_link_printk(link, KERN_INFO,
+				"SATA link down (SStatus %X SControl %X)\n",
+				sstatus, scontrol);
+	}
+}
+
+/**
+ *	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
+ */
+
+struct ata_device *ata_dev_pair(struct ata_device *adev)
+{
+	struct ata_link *link = adev->link;
+	struct ata_device *pair = &link->device[1 - adev->devno];
+	if (!ata_dev_enabled(pair))
+		return NULL;
+	return pair;
+}
+
+/**
+ *	ata_port_disable - Disable port.
+ *	@ap: Port to be disabled.
+ *
+ *	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.
+ *
+ *	LOCKING: host lock, or some other form of
+ *	serialization.
+ */
+
+void ata_port_disable(struct ata_port *ap)
+{
+	ap->link.device[0].class = ATA_DEV_NONE;
+	ap->link.device[1].class = ATA_DEV_NONE;
+	ap->flags |= ATA_FLAG_DISABLED;
+}
+
+/**
+ *	sata_down_spd_limit - adjust SATA spd limit downward
+ *	@link: Link to adjust SATA spd limit for
+ *
+ *	Adjust SATA spd limit of @link downward.  Note that this
+ *	function only adjusts the limit.  The change must be applied
+ *	using sata_set_spd().
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure
+ */
+int sata_down_spd_limit(struct ata_link *link)
+{
+	u32 sstatus, spd, mask;
+	int rc, highbit;
+
+	if (!sata_scr_valid(link))
+		return -EOPNOTSUPP;
+
+	/* If SCR can be read, use it to determine the current SPD.
+	 * If not, use cached value in link->sata_spd.
+	 */
+	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
+	if (rc == 0)
+		spd = (sstatus >> 4) & 0xf;
+	else
+		spd = link->sata_spd;
+
+	mask = link->sata_spd_limit;
+	if (mask <= 1)
+		return -EINVAL;
+
+	/* unconditionally mask off the highest bit */
+	highbit = fls(mask) - 1;
+	mask &= ~(1 << highbit);
+
+	/* 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? */
+	if (!mask)
+		return -EINVAL;
+
+	link->sata_spd_limit = mask;
+
+	ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
+			sata_spd_string(fls(mask)));
+
+	return 0;
+}
+
+static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
+{
+	struct ata_link *host_link = &link->ap->link;
+	u32 limit, target, spd;
+
+	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;
+	else
+		target = fls(limit);
+
+	spd = (*scontrol >> 4) & 0xf;
+	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
+
+	return spd != target;
+}
+
+/**
+ *	sata_set_spd_needed - is SATA spd configuration needed
+ *	@link: Link in question
+ *
+ *	Test whether the spd limit in SControl matches
+ *	@link->sata_spd_limit.  This function is used to determine
+ *	whether hardreset is necessary to apply SATA spd
+ *	configuration.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	1 if SATA spd configuration is needed, 0 otherwise.
+ */
+static int sata_set_spd_needed(struct ata_link *link)
+{
+	u32 scontrol;
+
+	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
+		return 1;
+
+	return __sata_set_spd_needed(link, &scontrol);
+}
+
+/**
+ *	sata_set_spd - set SATA spd according to spd limit
+ *	@link: Link to set SATA spd for
+ *
+ *	Set SATA spd of @link according to sata_spd_limit.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 if spd doesn't need to be changed, 1 if spd has been
+ *	changed.  Negative errno if SCR registers are inaccessible.
+ */
+int sata_set_spd(struct ata_link *link)
+{
+	u32 scontrol;
+	int rc;
+
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	if (!__sata_set_spd_needed(link, &scontrol))
+		return 0;
+
+	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+		return rc;
+
+	return 1;
+}
+
+/*
+ * This mode timing computation functionality is ported over from
+ * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
+ */
+/*
+ * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
+ * These were taken from ATA/ATAPI-6 standard, rev 0a, except
+ * for UDMA6, which is currently supported only by Maxtor drives.
+ *
+ * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
+ */
+
+static const struct ata_timing ata_timing[] = {
+/*	{ 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 },
+
+	{ 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 },
+
+	{ 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 },
+	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 100,   0 },
+	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20,  80,   0 },
+
+/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
+	{ 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 },
+
+	{ 0xFF }
+};
+
+#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
+#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
+
+static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
+{
+	q->setup   = EZ(t->setup   * 1000,  T);
+	q->act8b   = EZ(t->act8b   * 1000,  T);
+	q->rec8b   = EZ(t->rec8b   * 1000,  T);
+	q->cyc8b   = EZ(t->cyc8b   * 1000,  T);
+	q->active  = EZ(t->active  * 1000,  T);
+	q->recover = EZ(t->recover * 1000,  T);
+	q->cycle   = EZ(t->cycle   * 1000,  T);
+	q->udma    = EZ(t->udma    * 1000, UT);
+}
+
+void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
+		      struct ata_timing *m, unsigned int what)
+{
+	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
+	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
+	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
+	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
+	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
+	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
+	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
+	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
+}
+
+const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
+{
+	const struct ata_timing *t = ata_timing;
+
+	while (xfer_mode > t->mode)
+		t++;
+
+	if (xfer_mode == t->mode)
+		return t;
+	return NULL;
+}
+
+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;
+
+	/*
+	 * Find the mode.
+	 */
+
+	if (!(s = ata_timing_find_mode(speed)))
+		return -EINVAL;
+
+	memcpy(t, s, sizeof(*s));
+
+	/*
+	 * If the drive is an EIDE drive, it can tell us it needs extended
+	 * PIO/MW_DMA cycle timing.
+	 */
+
+	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
+		memset(&p, 0, sizeof(p));
+		if (speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
+			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
+					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
+		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
+			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
+		}
+		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
+	}
+
+	/*
+	 * Convert the timing to bus clock counts.
+	 */
+
+	ata_timing_quantize(t, t, T, UT);
+
+	/*
+	 * 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.
+	 */
+
+	if (speed > XFER_PIO_6) {
+		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
+		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
+	}
+
+	/*
+	 * Lengthen active & recovery time so that cycle time is correct.
+	 */
+
+	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;
+	}
+
+	/* 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;
+
+	return 0;
+}
+
+/**
+ *	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;
+}
+
+/**
+ *	ata_down_xfermask_limit - adjust dev xfer masks downward
+ *	@dev: Device to adjust xfer masks
+ *	@sel: ATA_DNXFER_* selector
+ *
+ *	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
+ */
+int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
+{
+	char buf[32];
+	unsigned long orig_mask, xfer_mask;
+	unsigned long pio_mask, mwdma_mask, udma_mask;
+	int quiet, highbit;
+
+	quiet = !!(sel & ATA_DNXFER_QUIET);
+	sel &= ~ATA_DNXFER_QUIET;
+
+	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);
+
+	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);
+	}
+
+	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
+			    &dev->udma_mask);
+
+	return 0;
+}
+
+static int ata_dev_set_mode(struct ata_device *dev)
+{
+	struct ata_eh_context *ehc = &dev->link->eh_context;
+	const char *dev_err_whine = "";
+	int ign_dev_err = 0;
+	unsigned int err_mask;
+	int rc;
+
+	dev->flags &= ~ATA_DFLAG_PIO;
+	if (dev->xfer_shift == ATA_SHIFT_PIO)
+		dev->flags |= ATA_DFLAG_PIO;
+
+	err_mask = ata_dev_set_xfermode(dev);
+
+	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;
+
+	if (dev->xfer_shift == ATA_SHIFT_PIO) {
+		/* Old CFA may refuse this command, which is just fine */
+		if (ata_id_is_cfa(dev->id))
+			ign_dev_err = 1;
+		/* Catch several broken garbage emulations plus some pre
+		   ATA devices */
+		if (ata_id_major_version(dev->id) == 0 &&
+					dev->pio_mode <= XFER_PIO_2)
+			ign_dev_err = 1;
+		/* 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 (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
+			ign_dev_err = 1;
+	}
+	/* 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 */
+	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
+	    dev->dma_mode == XFER_MW_DMA_0 &&
+	    (dev->id[63] >> 8) & 1)
+		ign_dev_err = 1;
+
+	/* 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;
+
+	if (err_mask & AC_ERR_DEV) {
+		if (!ign_dev_err)
+			goto fail;
+		else
+			dev_err_whine = " (device error ignored)";
+	}
+
+	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
+		dev->xfer_shift, (int)dev->xfer_mode);
+
+	ata_dev_printk(dev, KERN_INFO, "configured for %s%s\n",
+		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
+		       dev_err_whine);
+
+	return 0;
+
+ fail:
+	ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
+		       "(err_mask=0x%x)\n", err_mask);
+	return -EIO;
+}
+
+/**
+ *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
+ *	@link: link on which timings will be programmed
+ *	@r_failed_dev: out parameter for failed device
+ *
+ *	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
+ *	returned in @r_failed_dev.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno otherwise
+ */
+
+int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
+{
+	struct ata_port *ap = link->ap;
+	struct ata_device *dev;
+	int rc = 0, used_dma = 0, found = 0;
+
+	/* step 1: calculate xfer_mask */
+	ata_link_for_each_dev(dev, link) {
+		unsigned long pio_mask, dma_mask;
+		unsigned int mode_mask;
+
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		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;
+
+		ata_dev_xfermask(dev);
+		ata_force_xfermask(dev);
+
+		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
+		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
+
+		if (libata_dma_mask & mode_mask)
+			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
+		else
+			dma_mask = 0;
+
+		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
+		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
+
+		found = 1;
+		if (ata_dma_enabled(dev))
+			used_dma = 1;
+	}
+	if (!found)
+		goto out;
+
+	/* step 2: always set host PIO timings */
+	ata_link_for_each_dev(dev, link) {
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		if (dev->pio_mode == 0xff) {
+			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
+			rc = -EINVAL;
+			goto out;
+		}
+
+		dev->xfer_mode = dev->pio_mode;
+		dev->xfer_shift = ATA_SHIFT_PIO;
+		if (ap->ops->set_piomode)
+			ap->ops->set_piomode(ap, dev);
+	}
+
+	/* step 3: set host DMA timings */
+	ata_link_for_each_dev(dev, link) {
+		if (!ata_dev_enabled(dev) || !ata_dma_enabled(dev))
+			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);
+	}
+
+	/* step 4: update devices' xfer mode */
+	ata_link_for_each_dev(dev, link) {
+		/* don't update suspended devices' xfer mode */
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		rc = ata_dev_set_mode(dev);
+		if (rc)
+			goto out;
+	}
+
+	/* Record simplex status. If we selected DMA then the other
+	 * host channels are not permitted to do so.
+	 */
+	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
+		ap->host->simplex_claimed = ap;
+
+ out:
+	if (rc)
+		*r_failed_dev = dev;
+	return rc;
+}
+
+/**
+ *	ata_wait_ready - wait for link to become ready
+ *	@link: link to be waited on
+ *	@deadline: deadline jiffies for the operation
+ *	@check_ready: callback to check link readiness
+ *
+ *	Wait for @link to become ready.  @check_ready should return
+ *	positive number if @link is ready, 0 if it isn't, -ENODEV if
+ *	link doesn't seem to be occupied, other errno for other error
+ *	conditions.
+ *
+ *	Transient -ENODEV conditions are allowed for
+ *	ATA_TMOUT_FF_WAIT.
+ *
+ *	LOCKING:
+ *	EH context.
+ *
+ *	RETURNS:
+ *	0 if @linke is ready before @deadline; otherwise, -errno.
+ */
+int ata_wait_ready(struct ata_link *link, unsigned long deadline,
+		   int (*check_ready)(struct ata_link *link))
+{
+	unsigned long start = jiffies;
+	unsigned long nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
+	int warned = 0;
+
+	/* Slave readiness can't be tested separately from master.  On
+	 * M/S emulation configuration, this function should be called
+	 * only on the master and it will handle both master and slave.
+	 */
+	WARN_ON(link == link->ap->slave_link);
+
+	if (time_after(nodev_deadline, deadline))
+		nodev_deadline = deadline;
+
+	while (1) {
+		unsigned long now = jiffies;
+		int ready, tmp;
+
+		ready = tmp = check_ready(link);
+		if (ready > 0)
+			return 0;
+
+		/* -ENODEV could be transient.  Ignore -ENODEV if link
+		 * is online.  Also, 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.  Wait for
+		 * ATA_TMOUT_FF_WAIT on -ENODEV if link isn't offline.
+		 *
+		 * Note that some PATA controllers (pata_ali) explode
+		 * if status register is read more than once when
+		 * there's no device attached.
+		 */
+		if (ready == -ENODEV) {
+			if (ata_link_online(link))
+				ready = 0;
+			else if ((link->ap->flags & ATA_FLAG_SATA) &&
+				 !ata_link_offline(link) &&
+				 time_before(now, nodev_deadline))
+				ready = 0;
+		}
+
+		if (ready)
+			return ready;
+		if (time_after(now, deadline))
+			return -EBUSY;
+
+		if (!warned && time_after(now, start + 5 * HZ) &&
+		    (deadline - now > 3 * HZ)) {
+			ata_link_printk(link, KERN_WARNING,
+				"link is slow to respond, please be patient "
+				"(ready=%d)\n", tmp);
+			warned = 1;
+		}
+
+		msleep(50);
+	}
+}
+
+/**
+ *	ata_wait_after_reset - wait for link to become ready after reset
+ *	@link: link to be waited on
+ *	@deadline: deadline jiffies for the operation
+ *	@check_ready: callback to check link readiness
+ *
+ *	Wait for @link to become ready after reset.
+ *
+ *	LOCKING:
+ *	EH context.
+ *
+ *	RETURNS:
+ *	0 if @linke is ready before @deadline; otherwise, -errno.
+ */
+int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
+				int (*check_ready)(struct ata_link *link))
+{
+	msleep(ATA_WAIT_AFTER_RESET);
+
+	return ata_wait_ready(link, deadline, check_ready);
+}
+
+/**
+ *	sata_link_debounce - debounce SATA phy status
+ *	@link: ATA link to debounce SATA phy status for
+ *	@params: timing parameters { interval, duratinon, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *
+*	Make sure SStatus of @link reaches stable state, determined by
+ *	holding the same value where DET is not 1 for @duration polled
+ *	every @interval, before @timeout.  Timeout constraints the
+ *	beginning of the stable state.  Because DET gets stuck at 1 on
+ *	some controllers after hot unplugging, this functions waits
+ *	until timeout then returns 0 if DET is stable at 1.
+ *
+ *	@timeout is further limited by @deadline.  The sooner of the
+ *	two is used.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_link_debounce(struct ata_link *link, const unsigned long *params,
+		       unsigned long deadline)
+{
+	unsigned long interval = params[0];
+	unsigned long duration = params[1];
+	unsigned long last_jiffies, t;
+	u32 last, cur;
+	int rc;
+
+	t = ata_deadline(jiffies, params[2]);
+	if (time_before(t, deadline))
+		deadline = t;
+
+	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
+		return rc;
+	cur &= 0xf;
+
+	last = cur;
+	last_jiffies = jiffies;
+
+	while (1) {
+		msleep(interval);
+		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
+			return rc;
+		cur &= 0xf;
+
+		/* DET stable? */
+		if (cur == last) {
+			if (cur == 1 && time_before(jiffies, deadline))
+				continue;
+			if (time_after(jiffies,
+				       ata_deadline(last_jiffies, duration)))
+				return 0;
+			continue;
+		}
+
+		/* unstable, start over */
+		last = cur;
+		last_jiffies = jiffies;
+
+		/* Check deadline.  If debouncing failed, return
+		 * -EPIPE to tell upper layer to lower link speed.
+		 */
+		if (time_after(jiffies, deadline))
+			return -EPIPE;
+	}
+}
+
+/**
+ *	sata_link_resume - resume SATA link
+ *	@link: ATA link to resume SATA
+ *	@params: timing parameters { interval, duratinon, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Resume SATA phy @link and debounce it.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_link_resume(struct ata_link *link, const unsigned long *params,
+		     unsigned long deadline)
+{
+	u32 scontrol, serror;
+	int rc;
+
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	scontrol = (scontrol & 0x0f0) | 0x300;
+
+	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+		return rc;
+
+	/* Some PHYs react badly if SStatus is pounded immediately
+	 * after resuming.  Delay 200ms before debouncing.
+	 */
+	msleep(200);
+
+	if ((rc = sata_link_debounce(link, params, deadline)))
+		return rc;
+
+	/* clear SError, some PHYs require this even for SRST to work */
+	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
+		rc = sata_scr_write(link, SCR_ERROR, serror);
+
+	return rc != -EINVAL ? rc : 0;
+}
+
+/**
+ *	ata_std_prereset - prepare for reset
+ *	@link: ATA link to be reset
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	@link is about to be reset.  Initialize it.  Failure from
+ *	prereset makes libata abort whole reset sequence and give up
+ *	that port, so prereset should be best-effort.  It does its
+ *	best to prepare for reset sequence but if things go wrong, it
+ *	should just whine, not fail.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_std_prereset(struct ata_link *link, unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct ata_eh_context *ehc = &link->eh_context;
+	const unsigned long *timing = sata_ehc_deb_timing(ehc);
+	int rc;
+
+	/* if we're about to do hardreset, nothing more to do */
+	if (ehc->i.action & ATA_EH_HARDRESET)
+		return 0;
+
+	/* if SATA, resume link */
+	if (ap->flags & ATA_FLAG_SATA) {
+		rc = sata_link_resume(link, timing, deadline);
+		/* whine about phy resume failure but proceed */
+		if (rc && rc != -EOPNOTSUPP)
+			ata_link_printk(link, KERN_WARNING, "failed to resume "
+					"link for reset (errno=%d)\n", rc);
+	}
+
+	/* no point in trying softreset on offline link */
+	if (ata_phys_link_offline(link))
+		ehc->i.action &= ~ATA_EH_SOFTRESET;
+
+	return 0;
+}
+
+/**
+ *	sata_link_hardreset - reset link via SATA phy reset
+ *	@link: link to reset
+ *	@timing: timing parameters { interval, duratinon, timeout } in msec
+ *	@deadline: deadline jiffies for the operation
+ *	@online: optional out parameter indicating link onlineness
+ *	@check_ready: optional callback to check link readiness
+ *
+ *	SATA phy-reset @link using DET bits of SControl register.
+ *	After hardreset, link readiness is waited upon using
+ *	ata_wait_ready() if @check_ready is specified.  LLDs are
+ *	allowed to not specify @check_ready and wait itself after this
+ *	function returns.  Device classification is LLD's
+ *	responsibility.
+ *
+ *	*@online is set to one iff reset succeeded and @link is online
+ *	after reset.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
+			unsigned long deadline,
+			bool *online, int (*check_ready)(struct ata_link *))
+{
+	u32 scontrol;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	if (online)
+		*online = false;
+
+	if (sata_set_spd_needed(link)) {
+		/* 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.
+		 */
+		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+			goto out;
+
+		scontrol = (scontrol & 0x0f0) | 0x304;
+
+		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
+			goto out;
+
+		sata_set_spd(link);
+	}
+
+	/* issue phy wake/reset */
+	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
+		goto out;
+
+	scontrol = (scontrol & 0x0f0) | 0x301;
+
+	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
+		goto out;
+
+	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
+	 * 10.4.2 says at least 1 ms.
+	 */
+	msleep(1);
+
+	/* bring link back */
+	rc = sata_link_resume(link, timing, deadline);
+	if (rc)
+		goto out;
+	/* if link is offline nothing more to do */
+	if (ata_phys_link_offline(link))
+		goto out;
+
+	/* Link is online.  From this point, -ENODEV too is an error. */
+	if (online)
+		*online = true;
+
+	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
+		/* If PMP is supported, we have to do follow-up SRST.
+		 * Some PMPs don't send D2H Reg FIS after hardreset if
+		 * the first port is empty.  Wait only for
+		 * ATA_TMOUT_PMP_SRST_WAIT.
+		 */
+		if (check_ready) {
+			unsigned long pmp_deadline;
+
+			pmp_deadline = ata_deadline(jiffies,
+						    ATA_TMOUT_PMP_SRST_WAIT);
+			if (time_after(pmp_deadline, deadline))
+				pmp_deadline = deadline;
+			ata_wait_ready(link, pmp_deadline, check_ready);
+		}
+		rc = -EAGAIN;
+		goto out;
+	}
+
+	rc = 0;
+	if (check_ready)
+		rc = ata_wait_ready(link, deadline, check_ready);
+ out:
+	if (rc && rc != -EAGAIN) {
+		/* online is set iff link is online && reset succeeded */
+		if (online)
+			*online = false;
+		ata_link_printk(link, KERN_ERR,
+				"COMRESET failed (errno=%d)\n", rc);
+	}
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+
+/**
+ *	sata_std_hardreset - COMRESET w/o waiting or classification
+ *	@link: link to reset
+ *	@class: resulting class of attached device
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Standard SATA COMRESET w/o waiting or classification.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 if link offline, -EAGAIN if link online, -errno on errors.
+ */
+int sata_std_hardreset(struct ata_link *link, unsigned int *class,
+		       unsigned long deadline)
+{
+	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
+	bool online;
+	int rc;
+
+	/* do hardreset */
+	rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
+	return online ? -EAGAIN : rc;
+}
+
+/**
+ *	ata_std_postreset - standard postreset callback
+ *	@link: the target ata_link
+ *	@classes: classes of attached devices
+ *
+ *	This function is invoked after a successful reset.  Note that
+ *	the device might have been reset more than once using
+ *	different reset methods before postreset is invoked.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_std_postreset(struct ata_link *link, unsigned int *classes)
+{
+	u32 serror;
+
+	DPRINTK("ENTER\n");
+
+	/* reset complete, clear SError */
+	if (!sata_scr_read(link, SCR_ERROR, &serror))
+		sata_scr_write(link, SCR_ERROR, serror);
+
+	/* print link status */
+	sata_print_link_status(link);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	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.
+ */
+static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
+			       const u16 *new_id)
+{
+	const u16 *old_id = dev->id;
+	unsigned char model[2][ATA_ID_PROD_LEN + 1];
+	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
+
+	if (dev->class != new_class) {
+		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
+			       dev->class, new_class);
+		return 0;
+	}
+
+	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]));
+
+	if (strcmp(model[0], model[1])) {
+		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
+			       "'%s' != '%s'\n", model[0], model[1]);
+		return 0;
+	}
+
+	if (strcmp(serial[0], serial[1])) {
+		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
+			       "'%s' != '%s'\n", serial[0], serial[1]);
+		return 0;
+	}
+
+	return 1;
+}
+
+/**
+ *	ata_dev_reread_id - Re-read IDENTIFY data
+ *	@dev: target ATA device
+ *	@readid_flags: read ID flags
+ *
+ *	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
+ */
+int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
+{
+	unsigned int class = dev->class;
+	u16 *id = (void *)dev->link->ap->sector_buf;
+	int rc;
+
+	/* read ID data */
+	rc = ata_dev_read_id(dev, &class, readid_flags, id);
+	if (rc)
+		return rc;
+
+	/* is the device still there? */
+	if (!ata_dev_same_device(dev, class, id))
+		return -ENODEV;
+
+	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
+	return 0;
+}
+
+/**
+ *	ata_dev_revalidate - Revalidate ATA device
+ *	@dev: device to revalidate
+ *	@new_class: new class code
+ *	@readid_flags: read ID flags
+ *
+ *	Re-read IDENTIFY page, make sure @dev is still attached to the
+ *	port and reconfigure it according to the new IDENTIFY page.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, negative errno otherwise
+ */
+int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
+		       unsigned int readid_flags)
+{
+	u64 n_sectors = dev->n_sectors;
+	int rc;
+
+	if (!ata_dev_enabled(dev))
+		return -ENODEV;
+
+	/* 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;
+	}
+
+	/* re-read ID */
+	rc = ata_dev_reread_id(dev, readid_flags);
+	if (rc)
+		goto fail;
+
+	/* configure device according to the new ID */
+	rc = ata_dev_configure(dev);
+	if (rc)
+		goto fail;
+
+	/* verify n_sectors hasn't changed */
+	if (dev->class == ATA_DEV_ATA && n_sectors &&
+	    dev->n_sectors != n_sectors) {
+		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
+			       "%llu != %llu\n",
+			       (unsigned long long)n_sectors,
+			       (unsigned long long)dev->n_sectors);
+
+		/* restore original n_sectors */
+		dev->n_sectors = n_sectors;
+
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	return 0;
+
+ fail:
+	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
+	return rc;
+}
+
+struct ata_blacklist_entry {
+	const char *model_num;
+	const char *model_rev;
+	unsigned long horkage;
+};
+
+static const struct ata_blacklist_entry ata_device_blacklist [] = {
+	/* Devices with DMA related problems under Linux */
+	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
+	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
+	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
+	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
+	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
+	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
+	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
+	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
+	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
+	{ "CRD-8480B",		NULL,		ATA_HORKAGE_NODMA },
+	{ "CRD-8482B",		NULL,		ATA_HORKAGE_NODMA },
+	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
+	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
+	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
+	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
+	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
+	{ "HITACHI CDR-8335",	NULL,		ATA_HORKAGE_NODMA },
+	{ "HITACHI CDR-8435",	NULL,		ATA_HORKAGE_NODMA },
+	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
+	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
+	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
+	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
+	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
+	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
+	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
+	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
+	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
+	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
+	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
+	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
+	/* Odd clown on sil3726/4726 PMPs */
+	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
+
+	/* Weird ATAPI devices */
+	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
+	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
+
+	/* Devices we expect to fail diagnostics */
+
+	/* Devices where NCQ should be avoided */
+	/* NCQ is slow */
+	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
+	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
+	/* http://thread.gmane.org/gmane.linux.ide/14907 */
+	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
+	/* NCQ is broken */
+	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
+	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
+	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
+	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
+
+	/* Seagate NCQ + FLUSH CACHE firmware bug */
+	{ "ST31500341AS",	"SD15",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31500341AS",	"SD16",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31500341AS",	"SD17",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31500341AS",	"SD18",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31500341AS",	"SD19",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+
+	{ "ST31000333AS",	"SD15",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31000333AS",	"SD16",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31000333AS",	"SD17",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31000333AS",	"SD18",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST31000333AS",	"SD19",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+
+	{ "ST3640623AS",	"SD15",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640623AS",	"SD16",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640623AS",	"SD17",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640623AS",	"SD18",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640623AS",	"SD19",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+
+	{ "ST3640323AS",	"SD15",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640323AS",	"SD16",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640323AS",	"SD17",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640323AS",	"SD18",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3640323AS",	"SD19",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+
+	{ "ST3320813AS",	"SD15",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320813AS",	"SD16",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320813AS",	"SD17",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320813AS",	"SD18",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320813AS",	"SD19",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+
+	{ "ST3320613AS",	"SD15",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320613AS",	"SD16",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320613AS",	"SD17",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320613AS",	"SD18",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+	{ "ST3320613AS",	"SD19",		ATA_HORKAGE_NONCQ |
+						ATA_HORKAGE_FIRMWARE_WARN },
+
+	/* 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, },
+
+	/* 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 },
+
+	/* Devices which report 1 sector over size HPA */
+	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
+	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
+	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
+
+	/* Devices which get the IVB wrong */
+	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
+	/* Maybe we should just blacklist TSSTcorp... */
+	{ "TSSTcorp CDDVDW SH-S202H", "SB00",	  ATA_HORKAGE_IVB, },
+	{ "TSSTcorp CDDVDW SH-S202H", "SB01",	  ATA_HORKAGE_IVB, },
+	{ "TSSTcorp CDDVDW SH-S202J", "SB00",	  ATA_HORKAGE_IVB, },
+	{ "TSSTcorp CDDVDW SH-S202J", "SB01",	  ATA_HORKAGE_IVB, },
+	{ "TSSTcorp CDDVDW SH-S202N", "SB00",	  ATA_HORKAGE_IVB, },
+	{ "TSSTcorp CDDVDW SH-S202N", "SB01",	  ATA_HORKAGE_IVB, },
+
+	/* Devices that do not need bridging limits applied */
+	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
+
+	/* End Marker */
+	{ }
+};
+
+static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
+{
+	const char *p;
+	int len;
+
+	/*
+	 * check for trailing wildcard: *\0
+	 */
+	p = strchr(patt, wildchar);
+	if (p && ((*(p + 1)) == 0))
+		len = p - patt;
+	else {
+		len = strlen(name);
+		if (!len) {
+			if (!*patt)
+				return 0;
+			return -1;
+		}
+	}
+
+	return strncmp(patt, name, len);
+}
+
+static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
+{
+	unsigned char model_num[ATA_ID_PROD_LEN + 1];
+	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
+	const struct ata_blacklist_entry *ad = ata_device_blacklist;
+
+	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));
+
+	while (ad->model_num) {
+		if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
+			if (ad->model_rev == NULL)
+				return ad->horkage;
+			if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
+				return ad->horkage;
+		}
+		ad++;
+	}
+	return 0;
+}
+
+static int ata_dma_blacklisted(const struct ata_device *dev)
+{
+	/* We don't support polling DMA.
+	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
+	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
+	 */
+	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
+	    (dev->flags & ATA_DFLAG_CDB_INTR))
+		return 1;
+	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
+}
+
+/**
+ *	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);
+}
+
+/**
+ *	cable_is_40wire		-	40/80/SATA decider
+ *	@ap: port to consider
+ *
+ *	This function encapsulates the policy for speed management
+ *	in one place. At the moment we don't cache the result but
+ *	there is a good case for setting ap->cbl to the result when
+ *	we are called with unknown cables (and figuring out if it
+ *	impacts hotplug at all).
+ *
+ *	Return 1 if the cable appears to be 40 wire.
+ */
+
+static int cable_is_40wire(struct ata_port *ap)
+{
+	struct ata_link *link;
+	struct ata_device *dev;
+
+	/* If the controller thinks we are 40 wire, we are. */
+	if (ap->cbl == ATA_CBL_PATA40)
+		return 1;
+
+	/* If the controller thinks we are 80 wire, we are. */
+	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
+		return 0;
+
+	/* If the system is known to be 40 wire short cable (eg
+	 * laptop), then we allow 80 wire modes even if the drive
+	 * isn't sure.
+	 */
+	if (ap->cbl == ATA_CBL_PATA40_SHORT)
+		return 0;
+
+	/* If the controller doesn't know, we scan.
+	 *
+	 * Note: We look for all 40 wire detects at this point.  Any
+	 *       80 wire detect is taken to be 80 wire cable because
+	 * - in many setups only the one drive (slave if present) will
+	 *   give a valid detect
+	 * - if you have a non detect capable drive you don't want it
+	 *   to colour the choice
+	 */
+	ata_port_for_each_link(link, ap) {
+		ata_link_for_each_dev(dev, link) {
+			if (ata_dev_enabled(dev) && !ata_is_40wire(dev))
+				return 0;
+		}
+	}
+	return 1;
+}
+
+/**
+ *	ata_dev_xfermask - Compute supported xfermask of the given device
+ *	@dev: Device to compute xfermask for
+ *
+ *	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...
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_dev_xfermask(struct ata_device *dev)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = link->ap;
+	struct ata_host *host = ap->host;
+	unsigned long xfer_mask;
+
+	/* controller modes available */
+	xfer_mask = ata_pack_xfermask(ap->pio_mask,
+				      ap->mwdma_mask, ap->udma_mask);
+
+	/* drive modes available */
+	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
+				       dev->mwdma_mask, dev->udma_mask);
+	xfer_mask &= ata_id_xfermask(dev->id);
+
+	/*
+	 *	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));
+	}
+
+	if (ata_dma_blacklisted(dev)) {
+		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+		ata_dev_printk(dev, KERN_WARNING,
+			       "device is on DMA blacklist, disabling DMA\n");
+	}
+
+	if ((host->flags & ATA_HOST_SIMPLEX) &&
+	    host->simplex_claimed && host->simplex_claimed != ap) {
+		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
+			       "other device, disabling DMA\n");
+	}
+
+	if (ap->flags & ATA_FLAG_NO_IORDY)
+		xfer_mask &= ata_pio_mask_no_iordy(dev);
+
+	if (ap->ops->mode_filter)
+		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
+
+	/* Apply cable rule here.  Don't apply it early because when
+	 * we handle hot plug the cable type can itself change.
+	 * Check this last so that we know if the transfer rate was
+	 * solely limited by the cable.
+	 * Unknown or 80 wire cables reported host side are checked
+	 * drive side as well. Cases where we know a 40wire cable
+	 * is used safely for 80 are not checked here.
+	 */
+	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
+		/* UDMA/44 or higher would be available */
+		if (cable_is_40wire(ap)) {
+			ata_dev_printk(dev, KERN_WARNING,
+				 "limited to UDMA/33 due to 40-wire cable\n");
+			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
+		}
+
+	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
+			    &dev->mwdma_mask, &dev->udma_mask);
+}
+
+/**
+ *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
+ *	@dev: Device to which command will be sent
+ *
+ *	Issue SET FEATURES - XFER MODE command to device @dev
+ *	on port @ap.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+
+static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	/* set up set-features taskfile */
+	DPRINTK("set features - xfer mode\n");
+
+	/* Some controllers and ATAPI devices show flaky interrupt
+	 * behavior after setting xfer mode.  Use polling instead.
+	 */
+	ata_tf_init(dev, &tf);
+	tf.command = ATA_CMD_SET_FEATURES;
+	tf.feature = SETFEATURES_XFER;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
+	tf.protocol = ATA_PROT_NODATA;
+	/* If we are using IORDY we must send the mode setting command */
+	if (ata_pio_need_iordy(dev))
+		tf.nsect = dev->xfer_mode;
+	/* If the device has IORDY and the controller does not - turn it off */
+ 	else if (ata_id_has_iordy(dev->id))
+		tf.nsect = 0x01;
+	else /* In the ancient relic department - skip all of this */
+		return 0;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+/**
+ *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
+ *	@dev: Device to which command will be sent
+ *	@enable: Whether to enable or disable the feature
+ *	@feature: The sector count represents the feature to set
+ *
+ *	Issue SET FEATURES - SATA FEATURES command to device @dev
+ *	on port @ap with sector count
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
+					u8 feature)
+{
+	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;
+	tf.nsect = feature;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
+ *	ata_dev_init_params - Issue INIT DEV PARAMS command
+ *	@dev: Device to which command will be sent
+ *	@heads: Number of heads (taskfile parameter)
+ *	@sectors: Number of sectors (taskfile parameter)
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+					u16 heads, u16 sectors)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	/* Number of sectors per track 1-255. Number of heads 1-16 */
+	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
+		return AC_ERR_INVALID;
+
+	/* set up init dev params taskfile */
+	DPRINTK("init dev params \n");
+
+	ata_tf_init(dev, &tf);
+	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 */
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
+	/* 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;
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
+ *	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.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+void ata_sg_clean(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scatterlist *sg = qc->sg;
+	int dir = qc->dma_dir;
+
+	WARN_ON(sg == NULL);
+
+	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
+
+	if (qc->n_elem)
+		dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
+
+	qc->flags &= ~ATA_QCFLAG_DMAMAP;
+	qc->sg = NULL;
+}
+
+/**
+ *	atapi_check_dma - Check whether ATAPI DMA can be supported
+ *	@qc: Metadata associated with taskfile to check
+ *
+ *	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.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS: 0 when ATAPI DMA can be used
+ *               nonzero otherwise
+ */
+int atapi_check_dma(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
+	 * few ATAPI devices choke on such DMA requests.
+	 */
+	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
+	    unlikely(qc->nbytes & 15))
+		return 1;
+
+	if (ap->ops->check_atapi_dma)
+		return ap->ops->check_atapi_dma(qc);
+
+	return 0;
+}
+
+/**
+ *	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;
+}
+
+void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
+
+/**
+ *	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:
+ *	spin_lock_irqsave(host lock)
+ */
+void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
+		 unsigned int n_elem)
+{
+	qc->sg = sg;
+	qc->n_elem = n_elem;
+	qc->cursg = qc->sg;
+}
+
+/**
+ *	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;
+	unsigned int n_elem;
+
+	VPRINTK("ENTER, ata%u\n", ap->print_id);
+
+	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
+	if (n_elem < 1)
+		return -1;
+
+	DPRINTK("%d sg elements mapped\n", n_elem);
+
+	qc->n_elem = n_elem;
+	qc->flags |= ATA_QCFLAG_DMAMAP;
+
+	return 0;
+}
+
+/**
+ *	swap_buf_le16 - swap halves of 16-bit words in place
+ *	@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:
+ *	Inherited from caller.
+ */
+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 */
+}
+
+/**
+ *	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:
+ *	None.
+ */
+
+static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc = NULL;
+	unsigned int i;
+
+	/* no command while frozen */
+	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
+		return NULL;
+
+	/* the last tag is reserved for internal command. */
+	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
+		if (!test_and_set_bit(i, &ap->qc_allocated)) {
+			qc = __ata_qc_from_tag(ap, i);
+			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
+ *	@tag: command tag
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->link->ap;
+	struct ata_queued_cmd *qc;
+
+	qc = ata_qc_new(ap);
+	if (qc) {
+		qc->scsicmd = NULL;
+		qc->ap = ap;
+		qc->dev = dev;
+
+		ata_qc_reinit(qc);
+	}
+
+	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:
+ *	spin_lock_irqsave(host lock)
+ */
+void ata_qc_free(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int tag;
+
+	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
+
+	qc->flags = 0;
+	tag = qc->tag;
+	if (likely(ata_tag_valid(tag))) {
+		qc->tag = ATA_TAG_POISON;
+		clear_bit(tag, &ap->qc_allocated);
+	}
+}
+
+void __ata_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_link *link = qc->dev->link;
+
+	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
+	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
+
+	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
+		ata_sg_clean(qc);
+
+	/* command should be marked inactive atomically with qc completion */
+	if (qc->tf.protocol == ATA_PROT_NCQ) {
+		link->sactive &= ~(1 << qc->tag);
+		if (!link->sactive)
+			ap->nr_active_links--;
+	} else {
+		link->active_tag = ATA_TAG_POISON;
+		ap->nr_active_links--;
+	}
+
+	/* clear exclusive status */
+	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
+		     ap->excl_link == link))
+		ap->excl_link = NULL;
+
+	/* 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;
+	ap->qc_active &= ~(1 << qc->tag);
+
+	/* call completion callback */
+	qc->complete_fn(qc);
+}
+
+static void fill_result_tf(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	qc->result_tf.flags = qc->tf.flags;
+	ap->ops->qc_fill_rtf(qc);
+}
+
+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;
+}
+
+/**
+ *	ata_qc_complete - Complete an active ATA command
+ *	@qc: Command to complete
+ *
+ *	Indicate to the mid and upper layers that an ATA
+ *	command has completed, with either an ok or not-ok status.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+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) {
+		struct ata_device *dev = qc->dev;
+		struct ata_eh_info *ehi = &dev->link->eh_info;
+
+		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
+
+		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 */
+				fill_result_tf(qc);
+				ata_qc_schedule_eh(qc);
+				return;
+			}
+		}
+
+		/* read result TF if requested */
+		if (qc->flags & ATA_QCFLAG_RESULT_TF)
+			fill_result_tf(qc);
+
+		/* 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;
+
+		case ATA_CMD_SLEEP:
+			dev->flags |= ATA_DFLAG_SLEEPING;
+			break;
+		}
+
+		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
+			ata_verify_xfer(qc);
+
+		__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)
+			fill_result_tf(qc);
+
+		__ata_qc_complete(qc);
+	}
+}
+
+/**
+ *	ata_qc_complete_multiple - Complete multiple qcs successfully
+ *	@ap: port in question
+ *	@qc_active: new qc_active mask
+ *
+ *	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:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Number of completed commands on success, -errno otherwise.
+ */
+int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
+{
+	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))) {
+			ata_qc_complete(qc);
+			nr_done++;
+		}
+	}
+
+	return nr_done;
+}
+
+/**
+ *	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:
+ *	spin_lock_irqsave(host lock)
+ */
+void ata_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_link *link = qc->dev->link;
+	u8 prot = qc->tf.protocol;
+
+	/* Make sure only one non-NCQ command is outstanding.  The
+	 * check is skipped for old EH because it reuses active qc to
+	 * request ATAPI sense.
+	 */
+	WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
+
+	if (ata_is_ncq(prot)) {
+		WARN_ON(link->sactive & (1 << qc->tag));
+
+		if (!link->sactive)
+			ap->nr_active_links++;
+		link->sactive |= 1 << qc->tag;
+	} else {
+		WARN_ON(link->sactive);
+
+		ap->nr_active_links++;
+		link->active_tag = qc->tag;
+	}
+
+	qc->flags |= ATA_QCFLAG_ACTIVE;
+	ap->qc_active |= 1 << qc->tag;
+
+	/* We guarantee to LLDs that they will have at least one
+	 * non-zero sg if the command is a data command.
+	 */
+	BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes));
+
+	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
+				 (ap->flags & ATA_FLAG_PIO_DMA)))
+		if (ata_sg_setup(qc))
+			goto sg_err;
+
+	/* if device is sleeping, schedule reset and abort the link */
+	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
+		link->eh_info.action |= ATA_EH_RESET;
+		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
+		ata_link_abort(link);
+		return;
+	}
+
+	ap->ops->qc_prep(qc);
+
+	qc->err_mask |= ap->ops->qc_issue(qc);
+	if (unlikely(qc->err_mask))
+		goto err;
+	return;
+
+sg_err:
+	qc->err_mask |= AC_ERR_SYSTEM;
+err:
+	ata_qc_complete(qc);
+}
+
+/**
+ *	sata_scr_valid - test whether SCRs are accessible
+ *	@link: ATA link to test SCR accessibility for
+ *
+ *	Test whether SCRs are accessible for @link.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if SCRs are accessible, 0 otherwise.
+ */
+int sata_scr_valid(struct ata_link *link)
+{
+	struct ata_port *ap = link->ap;
+
+	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
+}
+
+/**
+ *	sata_scr_read - read SCR register of the specified port
+ *	@link: ATA link to read SCR for
+ *	@reg: SCR to read
+ *	@val: Place to store read value
+ *
+ *	Read SCR register @reg of @link into *@val.  This function is
+ *	guaranteed to succeed if @link is ap->link, the cable type of
+ *	the port is SATA and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None if @link is ap->link.  Kernel thread context otherwise.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_read(struct ata_link *link, int reg, u32 *val)
+{
+	if (ata_is_host_link(link)) {
+		if (sata_scr_valid(link))
+			return link->ap->ops->scr_read(link, reg, val);
+		return -EOPNOTSUPP;
+	}
+
+	return sata_pmp_scr_read(link, reg, val);
+}
+
+/**
+ *	sata_scr_write - write SCR register of the specified port
+ *	@link: ATA link to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	Write @val to SCR register @reg of @link.  This function is
+ *	guaranteed to succeed if @link is ap->link, the cable type of
+ *	the port is SATA and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None if @link is ap->link.  Kernel thread context otherwise.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write(struct ata_link *link, int reg, u32 val)
+{
+	if (ata_is_host_link(link)) {
+		if (sata_scr_valid(link))
+			return link->ap->ops->scr_write(link, reg, val);
+		return -EOPNOTSUPP;
+	}
+
+	return sata_pmp_scr_write(link, reg, val);
+}
+
+/**
+ *	sata_scr_write_flush - write SCR register of the specified port and flush
+ *	@link: ATA link to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	This function is identical to sata_scr_write() except that this
+ *	function performs flush after writing to the register.
+ *
+ *	LOCKING:
+ *	None if @link is ap->link.  Kernel thread context otherwise.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
+{
+	if (ata_is_host_link(link)) {
+		int rc;
+
+		if (sata_scr_valid(link)) {
+			rc = link->ap->ops->scr_write(link, reg, val);
+			if (rc == 0)
+				rc = link->ap->ops->scr_read(link, reg, &val);
+			return rc;
+		}
+		return -EOPNOTSUPP;
+	}
+
+	return sata_pmp_scr_write(link, reg, val);
+}
+
+/**
+ *	ata_phys_link_online - test whether the given link is online
+ *	@link: ATA link to test
+ *
+ *	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).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	True if the port online status is available and online.
+ */
+bool ata_phys_link_online(struct ata_link *link)
+{
+	u32 sstatus;
+
+	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
+	    (sstatus & 0xf) == 0x3)
+		return true;
+	return false;
+}
+
+/**
+ *	ata_phys_link_offline - test whether the given link is offline
+ *	@link: ATA link to test
+ *
+ *	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).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	True if the port offline status is available and offline.
+ */
+bool ata_phys_link_offline(struct ata_link *link)
+{
+	u32 sstatus;
+
+	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
+	    (sstatus & 0xf) != 0x3)
+		return true;
+	return false;
+}
+
+/**
+ *	ata_link_online - test whether the given link is online
+ *	@link: ATA link to test
+ *
+ *	Test whether @link is online.  This is identical to
+ *	ata_phys_link_online() when there's no slave link.  When
+ *	there's a slave link, this function should only be called on
+ *	the master link and will return true if any of M/S links is
+ *	online.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	True if the port online status is available and online.
+ */
+bool ata_link_online(struct ata_link *link)
+{
+	struct ata_link *slave = link->ap->slave_link;
+
+	WARN_ON(link == slave);	/* shouldn't be called on slave link */
+
+	return ata_phys_link_online(link) ||
+		(slave && ata_phys_link_online(slave));
+}
+
+/**
+ *	ata_link_offline - test whether the given link is offline
+ *	@link: ATA link to test
+ *
+ *	Test whether @link is offline.  This is identical to
+ *	ata_phys_link_offline() when there's no slave link.  When
+ *	there's a slave link, this function should only be called on
+ *	the master link and will return true if both M/S links are
+ *	offline.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	True if the port offline status is available and offline.
+ */
+bool ata_link_offline(struct ata_link *link)
+{
+	struct ata_link *slave = link->ap->slave_link;
+
+	WARN_ON(link == slave);	/* shouldn't be called on slave link */
+
+	return ata_phys_link_offline(link) &&
+		(!slave || ata_phys_link_offline(slave));
+}
+
+#ifdef CONFIG_PM
+static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
+			       unsigned int action, unsigned int ehi_flags,
+			       int wait)
+{
+	unsigned long flags;
+	int i, rc;
+
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+		struct ata_link *link;
+
+		/* 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;
+		__ata_port_for_each_link(link, ap) {
+			link->eh_info.action |= action;
+			link->eh_info.flags |= ehi_flags;
+		}
+
+		ata_port_schedule_eh(ap);
+
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		/* wait and check result */
+		if (wait) {
+			ata_port_wait_eh(ap);
+			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
+			if (rc)
+				return rc;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_host_suspend - suspend host
+ *	@host: host to suspend
+ *	@mesg: PM message
+ *
+ *	Suspend @host.  Actual operation is performed by EH.  This
+ *	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.
+ */
+int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
+{
+	int rc;
+
+	/*
+	 * disable link pm on all ports before requesting
+	 * any pm activity
+	 */
+	ata_lpm_enable(host);
+
+	rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
+	if (rc == 0)
+		host->dev->power.power_state = mesg;
+	return rc;
+}
+
+/**
+ *	ata_host_resume - resume host
+ *	@host: host to resume
+ *
+ *	Resume @host.  Actual operation is performed by EH.  This
+ *	function requests EH to perform PM operations and returns.
+ *	Note that all resume operations are performed parallely.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_host_resume(struct ata_host *host)
+{
+	ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
+			    ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
+	host->dev->power.power_state = PMSG_ON;
+
+	/* reenable link pm */
+	ata_lpm_disable(host);
+}
+#endif
+
+/**
+ *	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.
+ */
+int ata_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->dev;
+
+	ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma,
+				      GFP_KERNEL);
+	if (!ap->prd)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/**
+ *	ata_dev_init - Initialize an ata_device structure
+ *	@dev: Device structure to initialize
+ *
+ *	Initialize @dev in preparation for probing.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_dev_init(struct ata_device *dev)
+{
+	struct ata_link *link = ata_dev_phys_link(dev);
+	struct ata_port *ap = link->ap;
+	unsigned long flags;
+
+	/* SATA spd limit is bound to the attached device, reset together */
+	link->sata_spd_limit = link->hw_sata_spd_limit;
+	link->sata_spd = 0;
+
+	/* High bits of dev->flags are used to record warm plug
+	 * requests which occur asynchronously.  Synchronize using
+	 * host lock.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+	dev->flags &= ~ATA_DFLAG_INIT_MASK;
+	dev->horkage = 0;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
+	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
+	dev->pio_mask = UINT_MAX;
+	dev->mwdma_mask = UINT_MAX;
+	dev->udma_mask = UINT_MAX;
+}
+
+/**
+ *	ata_link_init - Initialize an ata_link structure
+ *	@ap: ATA port link is attached to
+ *	@link: Link structure to initialize
+ *	@pmp: Port multiplier port number
+ *
+ *	Initialize @link.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
+{
+	int i;
+
+	/* clear everything except for devices */
+	memset(link, 0, offsetof(struct ata_link, device[0]));
+
+	link->ap = ap;
+	link->pmp = pmp;
+	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.
+ */
+int sata_link_init_spd(struct ata_link *link)
+{
+	u8 spd;
+	int rc;
+
+	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
+	if (rc)
+		return rc;
+
+	spd = (link->saved_scontrol >> 4) & 0xf;
+	if (spd)
+		link->hw_sata_spd_limit &= (1 << spd) - 1;
+
+	ata_force_link_limits(link);
+
+	link->sata_spd_limit = link->hw_sata_spd_limit;
+
+	return 0;
+}
+
+/**
+ *	ata_port_alloc - allocate and initialize basic ATA port resources
+ *	@host: ATA host this allocated port belongs to
+ *
+ *	Allocate and initialize basic ATA port resources.
+ *
+ *	RETURNS:
+ *	Allocate ATA port on success, NULL on failure.
+ *
+ *	LOCKING:
+ *	Inherited from calling layer (may sleep).
+ */
+struct ata_port *ata_port_alloc(struct ata_host *host)
+{
+	struct ata_port *ap;
+
+	DPRINTK("ENTER\n");
+
+	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
+	if (!ap)
+		return NULL;
+
+	ap->pflags |= ATA_PFLAG_INITIALIZING;
+	ap->lock = &host->lock;
+	ap->flags = ATA_FLAG_DISABLED;
+	ap->print_id = -1;
+	ap->ctl = ATA_DEVCTL_OBS;
+	ap->host = host;
+	ap->dev = host->dev;
+	ap->last_ctl = 0xFF;
+
+#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;
+#else
+	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
+#endif
+
+#ifdef CONFIG_ATA_SFF
+	INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
+#else
+	INIT_DELAYED_WORK(&ap->port_task, NULL);
+#endif
+	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
+	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
+	INIT_LIST_HEAD(&ap->eh_done_q);
+	init_waitqueue_head(&ap->eh_wait_q);
+	init_completion(&ap->park_req_pending);
+	init_timer_deferrable(&ap->fastdrain_timer);
+	ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
+	ap->fastdrain_timer.data = (unsigned long)ap;
+
+	ap->cbl = ATA_CBL_NONE;
+
+	ata_link_init(ap, &ap->link, 0);
+
+#ifdef ATA_IRQ_TRAP
+	ap->stats.unhandled_irq = 1;
+	ap->stats.idle_irq = 1;
+#endif
+	return ap;
+}
+
+static void ata_host_release(struct device *gendev, void *res)
+{
+	struct ata_host *host = dev_get_drvdata(gendev);
+	int i;
+
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+
+		if (!ap)
+			continue;
+
+		if (ap->scsi_host)
+			scsi_host_put(ap->scsi_host);
+
+		kfree(ap->pmp_link);
+		kfree(ap->slave_link);
+		kfree(ap);
+		host->ports[i] = NULL;
+	}
+
+	dev_set_drvdata(gendev, NULL);
+}
+
+/**
+ *	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;
+}
+
+/**
+ *	ata_host_alloc_pinfo - alloc host and init with port_info array
+ *	@dev: generic device this host is associated with
+ *	@ppi: array of ATA port_info to initialize host with
+ *	@n_ports: number of ATA ports attached to this host
+ *
+ *	Allocate ATA host and initialize with info from @ppi.  If NULL
+ *	terminated, @ppi may contain fewer entries than @n_ports.  The
+ *	last entry will be used for the remaining ports.
+ *
+ *	RETURNS:
+ *	Allocate ATA host on success, NULL on failure.
+ *
+ *	LOCKING:
+ *	Inherited from calling layer (may sleep).
+ */
+struct ata_host *ata_host_alloc_pinfo(struct device *dev,
+				      const struct ata_port_info * const * ppi,
+				      int n_ports)
+{
+	const struct ata_port_info *pi;
+	struct ata_host *host;
+	int i, j;
+
+	host = ata_host_alloc(dev, n_ports);
+	if (!host)
+		return NULL;
+
+	for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+
+		if (ppi[j])
+			pi = ppi[j++];
+
+		ap->pio_mask = pi->pio_mask;
+		ap->mwdma_mask = pi->mwdma_mask;
+		ap->udma_mask = pi->udma_mask;
+		ap->flags |= pi->flags;
+		ap->link.flags |= pi->link_flags;
+		ap->ops = pi->port_ops;
+
+		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
+			host->ops = pi->port_ops;
+	}
+
+	return host;
+}
+
+/**
+ *	ata_slave_link_init - initialize slave link
+ *	@ap: port to initialize slave link for
+ *
+ *	Create and initialize slave link for @ap.  This enables slave
+ *	link handling on the port.
+ *
+ *	In libata, a port contains links and a link contains devices.
+ *	There is single host link but if a PMP is attached to it,
+ *	there can be multiple fan-out links.  On SATA, there's usually
+ *	a single device connected to a link but PATA and SATA
+ *	controllers emulating TF based interface can have two - master
+ *	and slave.
+ *
+ *	However, there are a few controllers which don't fit into this
+ *	abstraction too well - SATA controllers which emulate TF
+ *	interface with both master and slave devices but also have
+ *	separate SCR register sets for each device.  These controllers
+ *	need separate links for physical link handling
+ *	(e.g. onlineness, link speed) but should be treated like a
+ *	traditional M/S controller for everything else (e.g. command
+ *	issue, softreset).
+ *
+ *	slave_link is libata's way of handling this class of
+ *	controllers without impacting core layer too much.  For
+ *	anything other than physical link handling, the default host
+ *	link is used for both master and slave.  For physical link
+ *	handling, separate @ap->slave_link is used.  All dirty details
+ *	are implemented inside libata core layer.  From LLD's POV, the
+ *	only difference is that prereset, hardreset and postreset are
+ *	called once more for the slave link, so the reset sequence
+ *	looks like the following.
+ *
+ *	prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
+ *	softreset(M) -> postreset(M) -> postreset(S)
+ *
+ *	Note that softreset is called only for the master.  Softreset
+ *	resets both M/S by definition, so SRST on master should handle
+ *	both (the standard method will work just fine).
+ *
+ *	LOCKING:
+ *	Should be called before host is registered.
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int ata_slave_link_init(struct ata_port *ap)
+{
+	struct ata_link *link;
+
+	WARN_ON(ap->slave_link);
+	WARN_ON(ap->flags & ATA_FLAG_PMP);
+
+	link = kzalloc(sizeof(*link), GFP_KERNEL);
+	if (!link)
+		return -ENOMEM;
+
+	ata_link_init(ap, link, 1);
+	ap->slave_link = link;
+	return 0;
+}
+
+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);
+}
+
+/**
+ *	ata_finalize_port_ops - finalize ata_port_operations
+ *	@ops: ata_port_operations to finalize
+ *
+ *	An ata_port_operations can inherit from another ops and that
+ *	ops can again inherit from another.  This can go on as many
+ *	times as necessary as long as there is no loop in the
+ *	inheritance chain.
+ *
+ *	Ops tables are finalized when the host is started.  NULL or
+ *	unspecified entries are inherited from the closet ancestor
+ *	which has the method and the entry is populated with it.
+ *	After finalization, the ops table directly points to all the
+ *	methods and ->inherits is no longer necessary and cleared.
+ *
+ *	Using ATA_OP_NULL, inheriting ops can force a method to NULL.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_finalize_port_ops(struct ata_port_operations *ops)
+{
+	static DEFINE_SPINLOCK(lock);
+	const struct ata_port_operations *cur;
+	void **begin = (void **)ops;
+	void **end = (void **)&ops->inherits;
+	void **pp;
+
+	if (!ops || !ops->inherits)
+		return;
+
+	spin_lock(&lock);
+
+	for (cur = ops->inherits; cur; cur = cur->inherits) {
+		void **inherit = (void **)cur;
+
+		for (pp = begin; pp < end; pp++, inherit++)
+			if (!*pp)
+				*pp = *inherit;
+	}
+
+	for (pp = begin; pp < end; pp++)
+		if (IS_ERR(*pp))
+			*pp = NULL;
+
+	ops->inherits = NULL;
+
+	spin_unlock(&lock);
+}
+
+/**
+ *	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
+ *	once.  If host->ops isn't initialized yet, its set to the
+ *	first non-dummy port ops.
+ *
+ *	LOCKING:
+ *	Inherited from calling layer (may sleep).
+ *
+ *	RETURNS:
+ *	0 if all ports are started successfully, -errno otherwise.
+ */
+int ata_host_start(struct ata_host *host)
+{
+	int have_stop = 0;
+	void *start_dr = NULL;
+	int i, rc;
+
+	if (host->flags & ATA_HOST_STARTED)
+		return 0;
+
+	ata_finalize_port_ops(host->ops);
+
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+
+		ata_finalize_port_ops(ap->ops);
+
+		if (!host->ops && !ata_port_is_dummy(ap))
+			host->ops = ap->ops;
+
+		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];
+
+		if (ap->ops->port_start) {
+			rc = ap->ops->port_start(ap);
+			if (rc) {
+				if (rc != -ENODEV)
+					dev_printk(KERN_ERR, host->dev,
+						"failed to start port %d "
+						"(errno=%d)\n", i, rc);
+				goto err_out;
+			}
+		}
+		ata_eh_freeze_port(ap);
+	}
+
+	if (start_dr)
+		devres_add(host->dev, start_dr);
+	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);
+	}
+	devres_free(start_dr);
+	return rc;
+}
+
+/**
+ *	ata_sas_host_init - Initialize a host struct
+ *	@host:	host to initialize
+ *	@dev:	device host is attached to
+ *	@flags:	host flags
+ *	@ops:	port_ops
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ */
+/* KILLME - the only user left is ipr */
+void ata_host_init(struct ata_host *host, struct device *dev,
+		   unsigned long flags, struct ata_port_operations *ops)
+{
+	spin_lock_init(&host->lock);
+	host->dev = dev;
+	host->flags = flags;
+	host->ops = ops;
+}
+
+/**
+ *	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;
+
+	/* associate with ACPI nodes */
+	ata_acpi_associate(host);
+
+	/* 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 */
+		sata_link_init_spd(&ap->link);
+		if (ap->slave_link)
+			sata_link_init_spd(ap->slave_link);
+
+		/* print per-port info to dmesg */
+		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
+					      ap->udma_mask);
+
+		if (!ata_port_is_dummy(ap)) {
+			ata_port_printk(ap, KERN_INFO,
+					"%cATA max %s %s\n",
+					(ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
+					ata_mode_string(xfer_mask),
+					ap->link.eh_info.desc);
+			ata_ehi_clear_desc(&ap->link.eh_info);
+		} else
+			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
+	}
+
+	/* perform each probe synchronously */
+	DPRINTK("probe begin\n");
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+
+		/* probe */
+		if (ap->ops->error_handler) {
+			struct ata_eh_info *ehi = &ap->link.eh_info;
+			unsigned long flags;
+
+			ata_port_probe(ap);
+
+			/* kick EH for boot probing */
+			spin_lock_irqsave(ap->lock, flags);
+
+			ehi->probe_mask |= ATA_ALL_DEVICES;
+			ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
+			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+
+			ap->pflags &= ~ATA_PFLAG_INITIALIZING;
+			ap->pflags |= ATA_PFLAG_LOADING;
+			ata_port_schedule_eh(ap);
+
+			spin_unlock_irqrestore(ap->lock, flags);
+
+			/* wait for EH to finish */
+			ata_port_wait_eh(ap);
+		} else {
+			DPRINTK("ata%u: bus probe begin\n", ap->print_id);
+			rc = ata_bus_probe(ap);
+			DPRINTK("ata%u: bus probe end\n", ap->print_id);
+
+			if (rc) {
+				/* FIXME: do something useful here?
+				 * Current libata behavior will
+				 * tear down everything when
+				 * the module is removed
+				 * or the h/w is unplugged.
+				 */
+			}
+		}
+	}
+
+	/* probes are done, now scan each port's disk(s) */
+	DPRINTK("host probe begin\n");
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+
+		ata_scsi_scan_host(ap, 1);
+	}
+
+	return 0;
+}
+
+/**
+ *	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.
+ *
+ *	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.
+ *
+ *	LOCKING:
+ *	Inherited from calling layer (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_host_activate(struct ata_host *host, int irq,
+		      irq_handler_t irq_handler, unsigned long irq_flags,
+		      struct scsi_host_template *sht)
+{
+	int i, rc;
+
+	rc = ata_host_start(host);
+	if (rc)
+		return rc;
+
+	/* Special case for polling mode */
+	if (!irq) {
+		WARN_ON(irq_handler);
+		return ata_host_register(host, sht);
+	}
+
+	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
+			      dev_driver_string(host->dev), host);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < host->n_ports; i++)
+		ata_port_desc(host->ports[i], "irq %d", irq);
+
+	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;
+}
+
+/**
+ *	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).
+ */
+static void ata_port_detach(struct ata_port *ap)
+{
+	unsigned long flags;
+	struct ata_link *link;
+	struct ata_device *dev;
+
+	if (!ap->ops->error_handler)
+		goto skip_eh;
+
+	/* tell EH we're leaving & flush EH */
+	spin_lock_irqsave(ap->lock, flags);
+	ap->pflags |= ATA_PFLAG_UNLOADING;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_port_wait_eh(ap);
+
+	/* EH is now guaranteed to see UNLOADING - EH context belongs
+	 * to us.  Restore SControl and disable all existing devices.
+	 */
+	__ata_port_for_each_link(link, ap) {
+		sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
+		ata_link_for_each_dev(dev, link)
+			ata_dev_disable(dev);
+	}
+
+	/* Final freeze & EH.  All in-flight commands are aborted.  EH
+	 * will be skipped and retrials will be terminated with bad
+	 * target.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+	ata_port_freeze(ap);	/* won't be thawed */
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_port_wait_eh(ap);
+	cancel_rearming_delayed_work(&ap->hotplug_task);
+
+ skip_eh:
+	/* remove the associated SCSI host */
+	scsi_remove_host(ap->scsi_host);
+}
+
+/**
+ *	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]);
+
+	/* the host is dead now, dissociate ACPI */
+	ata_acpi_dissociate(host);
+}
+
+#ifdef CONFIG_PCI
+
+/**
+ *	ata_pci_remove_one - PCI layer callback for device removal
+ *	@pdev: PCI device that was removed
+ *
+ *	PCI layer indicates to libata via this hook that hot-unplug or
+ *	module unload event has occurred.  Detach all ports.  Resource
+ *	release is handled via devres.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ */
+void ata_pci_remove_one(struct pci_dev *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ata_host *host = dev_get_drvdata(dev);
+
+	ata_host_detach(host);
+}
+
+/* move to PCI subsystem */
+int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
+{
+	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;
+}
+
+#ifdef CONFIG_PM
+void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	pci_save_state(pdev);
+	pci_disable_device(pdev);
+
+	if (mesg.event & PM_EVENT_SLEEP)
+		pci_set_power_state(pdev, PCI_D3hot);
+}
+
+int ata_pci_device_do_resume(struct pci_dev *pdev)
+{
+	int rc;
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+
+	rc = pcim_enable_device(pdev);
+	if (rc) {
+		dev_printk(KERN_ERR, &pdev->dev,
+			   "failed to enable device after resume (%d)\n", rc);
+		return rc;
+	}
+
+	pci_set_master(pdev);
+	return 0;
+}
+
+int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	struct ata_host *host = dev_get_drvdata(&pdev->dev);
+	int rc = 0;
+
+	rc = ata_host_suspend(host, mesg);
+	if (rc)
+		return rc;
+
+	ata_pci_device_do_suspend(pdev, mesg);
+
+	return 0;
+}
+
+int ata_pci_device_resume(struct pci_dev *pdev)
+{
+	struct ata_host *host = dev_get_drvdata(&pdev->dev);
+	int rc;
+
+	rc = ata_pci_device_do_resume(pdev);
+	if (rc == 0)
+		ata_host_resume(host);
+	return rc;
+}
+#endif /* CONFIG_PM */
+
+#endif /* CONFIG_PCI */
+
+static int __init ata_parse_force_one(char **cur,
+				      struct ata_force_ent *force_ent,
+				      const char **reason)
+{
+	/* FIXME: Currently, there's no way to tag init const data and
+	 * using __initdata causes build failure on some versions of
+	 * gcc.  Once __initdataconst is implemented, add const to the
+	 * following structure.
+	 */
+	static struct ata_force_param force_tbl[] __initdata = {
+		{ "40c",	.cbl		= ATA_CBL_PATA40 },
+		{ "80c",	.cbl		= ATA_CBL_PATA80 },
+		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
+		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
+		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
+		{ "sata",	.cbl		= ATA_CBL_SATA },
+		{ "1.5Gbps",	.spd_limit	= 1 },
+		{ "3.0Gbps",	.spd_limit	= 2 },
+		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
+		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
+		{ "pio0",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 0) },
+		{ "pio1",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 1) },
+		{ "pio2",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 2) },
+		{ "pio3",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 3) },
+		{ "pio4",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 4) },
+		{ "pio5",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 5) },
+		{ "pio6",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 6) },
+		{ "mwdma0",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 0) },
+		{ "mwdma1",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 1) },
+		{ "mwdma2",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 2) },
+		{ "mwdma3",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 3) },
+		{ "mwdma4",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 4) },
+		{ "udma0",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
+		{ "udma16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
+		{ "udma/16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
+		{ "udma1",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
+		{ "udma25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
+		{ "udma/25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
+		{ "udma2",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
+		{ "udma33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
+		{ "udma/33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
+		{ "udma3",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
+		{ "udma44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
+		{ "udma/44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
+		{ "udma4",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
+		{ "udma66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
+		{ "udma/66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
+		{ "udma5",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
+		{ "udma100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
+		{ "udma/100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
+		{ "udma6",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
+		{ "udma133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
+		{ "udma/133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
+		{ "udma7",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 7) },
+		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
+		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
+		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
+	};
+	char *start = *cur, *p = *cur;
+	char *id, *val, *endp;
+	const struct ata_force_param *match_fp = NULL;
+	int nr_matches = 0, i;
+
+	/* find where this param ends and update *cur */
+	while (*p != '\0' && *p != ',')
+		p++;
+
+	if (*p == '\0')
+		*cur = p;
+	else
+		*cur = p + 1;
+
+	*p = '\0';
+
+	/* parse */
+	p = strchr(start, ':');
+	if (!p) {
+		val = strstrip(start);
+		goto parse_val;
+	}
+	*p = '\0';
+
+	id = strstrip(start);
+	val = strstrip(p + 1);
+
+	/* parse id */
+	p = strchr(id, '.');
+	if (p) {
+		*p++ = '\0';
+		force_ent->device = simple_strtoul(p, &endp, 10);
+		if (p == endp || *endp != '\0') {
+			*reason = "invalid device";
+			return -EINVAL;
+		}
+	}
+
+	force_ent->port = simple_strtoul(id, &endp, 10);
+	if (p == endp || *endp != '\0') {
+		*reason = "invalid port/link";
+		return -EINVAL;
+	}
+
+ parse_val:
+	/* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
+	for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
+		const struct ata_force_param *fp = &force_tbl[i];
+
+		if (strncasecmp(val, fp->name, strlen(val)))
+			continue;
+
+		nr_matches++;
+		match_fp = fp;
+
+		if (strcasecmp(val, fp->name) == 0) {
+			nr_matches = 1;
+			break;
+		}
+	}
+
+	if (!nr_matches) {
+		*reason = "unknown value";
+		return -EINVAL;
+	}
+	if (nr_matches > 1) {
+		*reason = "ambigious value";
+		return -EINVAL;
+	}
+
+	force_ent->param = *match_fp;
+
+	return 0;
+}
+
+static void __init ata_parse_force_param(void)
+{
+	int idx = 0, size = 1;
+	int last_port = -1, last_device = -1;
+	char *p, *cur, *next;
+
+	/* calculate maximum number of params and allocate force_tbl */
+	for (p = ata_force_param_buf; *p; p++)
+		if (*p == ',')
+			size++;
+
+	ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
+	if (!ata_force_tbl) {
+		printk(KERN_WARNING "ata: failed to extend force table, "
+		       "libata.force ignored\n");
+		return;
+	}
+
+	/* parse and populate the table */
+	for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
+		const char *reason = "";
+		struct ata_force_ent te = { .port = -1, .device = -1 };
+
+		next = cur;
+		if (ata_parse_force_one(&next, &te, &reason)) {
+			printk(KERN_WARNING "ata: failed to parse force "
+			       "parameter \"%s\" (%s)\n",
+			       cur, reason);
+			continue;
+		}
+
+		if (te.port == -1) {
+			te.port = last_port;
+			te.device = last_device;
+		}
+
+		ata_force_tbl[idx++] = te;
+
+		last_port = te.port;
+		last_device = te.device;
+	}
+
+	ata_force_tbl_size = idx;
+}
+
+static int __init ata_init(void)
+{
+	ata_parse_force_param();
+
+	ata_wq = create_workqueue("ata");
+	if (!ata_wq)
+		goto free_force_tbl;
+
+	ata_aux_wq = create_singlethread_workqueue("ata_aux");
+	if (!ata_aux_wq)
+		goto free_wq;
+
+	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
+	return 0;
+
+free_wq:
+	destroy_workqueue(ata_wq);
+free_force_tbl:
+	kfree(ata_force_tbl);
+	return -ENOMEM;
+}
+
+static void __exit ata_exit(void)
+{
+	kfree(ata_force_tbl);
+	destroy_workqueue(ata_wq);
+	destroy_workqueue(ata_aux_wq);
+}
+
+subsys_initcall(ata_init);
+module_exit(ata_exit);
+
+static unsigned long ratelimit_time;
+static DEFINE_SPINLOCK(ata_ratelimit_lock);
+
+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;
+}
+
+/**
+ *	ata_wait_register - wait until register value changes
+ *	@reg: IO-mapped register
+ *	@mask: Mask to apply to read register value
+ *	@val: Wait condition
+ *	@interval: polling interval in milliseconds
+ *	@timeout: 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, unsigned long timeout)
+{
+	unsigned long deadline;
+	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.
+	 */
+	deadline = ata_deadline(jiffies, timeout);
+
+	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
+		msleep(interval);
+		tmp = ioread32(reg);
+	}
+
+	return tmp;
+}
+
+/*
+ * Dummy port_ops
+ */
+static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
+{
+	return AC_ERR_SYSTEM;
+}
+
+static void ata_dummy_error_handler(struct ata_port *ap)
+{
+	/* truly dummy */
+}
+
+struct ata_port_operations ata_dummy_port_ops = {
+	.qc_prep		= ata_noop_qc_prep,
+	.qc_issue		= ata_dummy_qc_issue,
+	.error_handler		= ata_dummy_error_handler,
+};
+
+const struct ata_port_info ata_dummy_port_info = {
+	.port_ops		= &ata_dummy_port_ops,
+};
+
+/*
+ * 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.
+ */
+EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
+EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
+EXPORT_SYMBOL_GPL(sata_deb_timing_long);
+EXPORT_SYMBOL_GPL(ata_base_port_ops);
+EXPORT_SYMBOL_GPL(sata_port_ops);
+EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
+EXPORT_SYMBOL_GPL(ata_dummy_port_info);
+EXPORT_SYMBOL_GPL(__ata_port_next_link);
+EXPORT_SYMBOL_GPL(ata_std_bios_param);
+EXPORT_SYMBOL_GPL(ata_host_init);
+EXPORT_SYMBOL_GPL(ata_host_alloc);
+EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
+EXPORT_SYMBOL_GPL(ata_slave_link_init);
+EXPORT_SYMBOL_GPL(ata_host_start);
+EXPORT_SYMBOL_GPL(ata_host_register);
+EXPORT_SYMBOL_GPL(ata_host_activate);
+EXPORT_SYMBOL_GPL(ata_host_detach);
+EXPORT_SYMBOL_GPL(ata_sg_init);
+EXPORT_SYMBOL_GPL(ata_qc_complete);
+EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
+EXPORT_SYMBOL_GPL(atapi_cmd_type);
+EXPORT_SYMBOL_GPL(ata_tf_to_fis);
+EXPORT_SYMBOL_GPL(ata_tf_from_fis);
+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);
+EXPORT_SYMBOL_GPL(ata_port_start);
+EXPORT_SYMBOL_GPL(ata_do_set_mode);
+EXPORT_SYMBOL_GPL(ata_std_qc_defer);
+EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
+EXPORT_SYMBOL_GPL(ata_port_probe);
+EXPORT_SYMBOL_GPL(ata_dev_disable);
+EXPORT_SYMBOL_GPL(sata_set_spd);
+EXPORT_SYMBOL_GPL(ata_wait_after_reset);
+EXPORT_SYMBOL_GPL(sata_link_debounce);
+EXPORT_SYMBOL_GPL(sata_link_resume);
+EXPORT_SYMBOL_GPL(ata_std_prereset);
+EXPORT_SYMBOL_GPL(sata_link_hardreset);
+EXPORT_SYMBOL_GPL(sata_std_hardreset);
+EXPORT_SYMBOL_GPL(ata_std_postreset);
+EXPORT_SYMBOL_GPL(ata_dev_classify);
+EXPORT_SYMBOL_GPL(ata_dev_pair);
+EXPORT_SYMBOL_GPL(ata_port_disable);
+EXPORT_SYMBOL_GPL(ata_ratelimit);
+EXPORT_SYMBOL_GPL(ata_wait_register);
+EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
+EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
+EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
+EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
+EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
+EXPORT_SYMBOL_GPL(sata_scr_valid);
+EXPORT_SYMBOL_GPL(sata_scr_read);
+EXPORT_SYMBOL_GPL(sata_scr_write);
+EXPORT_SYMBOL_GPL(sata_scr_write_flush);
+EXPORT_SYMBOL_GPL(ata_link_online);
+EXPORT_SYMBOL_GPL(ata_link_offline);
+#ifdef CONFIG_PM
+EXPORT_SYMBOL_GPL(ata_host_suspend);
+EXPORT_SYMBOL_GPL(ata_host_resume);
+#endif /* CONFIG_PM */
+EXPORT_SYMBOL_GPL(ata_id_string);
+EXPORT_SYMBOL_GPL(ata_id_c_string);
+EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
+EXPORT_SYMBOL_GPL(ata_scsi_simulate);
+
+EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
+EXPORT_SYMBOL_GPL(ata_timing_find_mode);
+EXPORT_SYMBOL_GPL(ata_timing_compute);
+EXPORT_SYMBOL_GPL(ata_timing_merge);
+EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
+
+#ifdef CONFIG_PCI
+EXPORT_SYMBOL_GPL(pci_test_config_bits);
+EXPORT_SYMBOL_GPL(ata_pci_remove_one);
+#ifdef CONFIG_PM
+EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
+EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
+EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
+EXPORT_SYMBOL_GPL(ata_pci_device_resume);
+#endif /* CONFIG_PM */
+#endif /* CONFIG_PCI */
+
+EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
+EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
+EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
+EXPORT_SYMBOL_GPL(ata_port_desc);
+#ifdef CONFIG_PCI
+EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
+#endif /* CONFIG_PCI */
+EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
+EXPORT_SYMBOL_GPL(ata_link_abort);
+EXPORT_SYMBOL_GPL(ata_port_abort);
+EXPORT_SYMBOL_GPL(ata_port_freeze);
+EXPORT_SYMBOL_GPL(sata_async_notification);
+EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
+EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
+EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
+EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
+EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
+EXPORT_SYMBOL_GPL(ata_do_eh);
+EXPORT_SYMBOL_GPL(ata_std_error_handler);
+
+EXPORT_SYMBOL_GPL(ata_cable_40wire);
+EXPORT_SYMBOL_GPL(ata_cable_80wire);
+EXPORT_SYMBOL_GPL(ata_cable_unknown);
+EXPORT_SYMBOL_GPL(ata_cable_ignore);
+EXPORT_SYMBOL_GPL(ata_cable_sata);