diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 56bf13cbd19863..7e937519a9301b 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -71,5 +71,6 @@ obj-$(CONFIG_ATA_GENERIC)	+= ata_generic.o
 # Should be last libata driver
 obj-$(CONFIG_PATA_LEGACY)	+= pata_legacy.o
 
-libata-objs	:= libata-core.o libata-scsi.o libata-sff.o libata-eh.o
+libata-objs	:= libata-core.o libata-scsi.o libata-sff.o libata-eh.o \
+		   libata-pmp.o
 libata-$(CONFIG_ATA_ACPI)	+= libata-acpi.o
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index eb9709864a21ab..9e7f55b710441f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3865,6 +3865,9 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
 	{ "IOMEGA  ZIP 250       ATAPI", NULL,	ATA_HORKAGE_NODMA }, /* temporary fix */
 	{ "IOMEGA  ZIP 250       ATAPI       Floppy",
 				NULL,		ATA_HORKAGE_NODMA },
+	/* Odd clown on sil3726/4726 PMPs */
+	{ "Config  Disk",	NULL,		ATA_HORKAGE_NODMA |
+						ATA_HORKAGE_SKIP_PM },
 
 	/* Weird ATAPI devices */
 	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
@@ -7251,6 +7254,14 @@ EXPORT_SYMBOL_GPL(ata_pci_default_filter);
 EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
 #endif /* CONFIG_PCI */
 
+EXPORT_SYMBOL_GPL(sata_pmp_read_init_tf);
+EXPORT_SYMBOL_GPL(sata_pmp_read_val);
+EXPORT_SYMBOL_GPL(sata_pmp_write_init_tf);
+EXPORT_SYMBOL_GPL(sata_pmp_std_prereset);
+EXPORT_SYMBOL_GPL(sata_pmp_std_hardreset);
+EXPORT_SYMBOL_GPL(sata_pmp_std_postreset);
+EXPORT_SYMBOL_GPL(sata_pmp_do_eh);
+
 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
new file mode 100644
index 00000000000000..671d171055a3d3
--- /dev/null
+++ b/drivers/ata/libata-pmp.c
@@ -0,0 +1,1182 @@
+/*
+ * libata-pmp.c - libata port multiplier support
+ *
+ * Copyright (c) 2007  SUSE Linux Products GmbH
+ * Copyright (c) 2007  Tejun Heo <teheo@suse.de>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/libata.h>
+#include "libata.h"
+
+/**
+ *	sata_pmp_read - read PMP register
+ *	@link: link to read PMP register for
+ *	@reg: register to read
+ *	@r_val: resulting value
+ *
+ *	Wrapper around ap->ops->pmp_read to make it easier to call and
+ *	nomarlize error return value.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
+{
+	struct ata_port *ap = link->ap;
+	struct ata_device *pmp_dev = ap->link.device;
+	int rc;
+
+	might_sleep();
+
+	rc = ap->ops->pmp_read(pmp_dev, link->pmp, reg, r_val);
+	if (rc)
+		rc = -EIO;
+	return rc;
+}
+
+/**
+ *	sata_pmp_write - write PMP register
+ *	@link: link to write PMP register for
+ *	@reg: register to write
+ *	@r_val: value to write
+ *
+ *	Wrapper around ap->ops->pmp_write to make it easier to call
+ *	and nomarlize error return value.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sata_pmp_write(struct ata_link *link, int reg, u32 val)
+{
+	struct ata_port *ap = link->ap;
+	struct ata_device *pmp_dev = ap->link.device;
+	int rc;
+
+	might_sleep();
+
+	rc = ap->ops->pmp_write(pmp_dev, link->pmp, reg, val);
+	if (rc)
+		rc = -EIO;
+	return rc;
+}
+
+/**
+ *	sata_pmp_read_init_tf - initialize TF for PMP read
+ *	@tf: taskfile to initialize
+ *	@dev: PMP dev
+ *	@pmp: port multiplier port number
+ *	@reg: register to read
+ *
+ *	Initialize @tf for PMP read command.
+ *
+ *	LOCKING:
+ *	None.
+ */
+void sata_pmp_read_init_tf(struct ata_taskfile *tf,
+			   struct ata_device *dev, int pmp, int reg)
+{
+	ata_tf_init(dev, tf);
+	tf->command = ATA_CMD_PMP_READ;
+	tf->protocol = ATA_PROT_NODATA;
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf->feature = reg;
+	tf->device = pmp;
+}
+
+/**
+ *	sata_pmp_read_val - extract PMP read result from TF
+ *	@tf: target TF
+ *
+ *	Determine PMP read result from @tf.
+ *
+ *	LOCKING:
+ *	None.
+ */
+u32 sata_pmp_read_val(const struct ata_taskfile *tf)
+{
+	return tf->nsect | tf->lbal << 8 | tf->lbam << 16 | tf->lbah << 24;
+}
+
+/**
+ *	sata_pmp_read_init_tf - initialize TF for PMP write
+ *	@tf: taskfile to initialize
+ *	@dev: PMP dev
+ *	@pmp: port multiplier port number
+ *	@reg: register to read
+ *	@val: value to write
+ *
+ *	Initialize @tf for PMP write command.
+ *
+ *	LOCKING:
+ *	None.
+ */
+void sata_pmp_write_init_tf(struct ata_taskfile *tf,
+			    struct ata_device *dev, int pmp, int reg, u32 val)
+{
+	ata_tf_init(dev, tf);
+	tf->command = ATA_CMD_PMP_WRITE;
+	tf->protocol = ATA_PROT_NODATA;
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf->feature = reg;
+	tf->device = pmp;
+	tf->nsect = val & 0xff;
+	tf->lbal = (val >> 8) & 0xff;
+	tf->lbam = (val >> 16) & 0xff;
+	tf->lbah = (val >> 24) & 0xff;
+}
+
+/**
+ *	sata_pmp_scr_read - read PSCR
+ *	@link: ATA link to read PSCR for
+ *	@reg: PSCR to read
+ *	@r_val: resulting value
+ *
+ *	Read PSCR @reg into @r_val for @link, to be called from
+ *	ata_scr_read().
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
+{
+	if (reg > SATA_PMP_PSCR_CONTROL)
+		return -EINVAL;
+
+	return sata_pmp_read(link, reg, r_val);
+}
+
+/**
+ *	sata_pmp_scr_write - write PSCR
+ *	@link: ATA link to write PSCR for
+ *	@reg: PSCR to write
+ *	@val: value to be written
+ *
+ *	Write @val to PSCR @reg for @link, to be called from
+ *	ata_scr_write() and ata_scr_write_flush().
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
+{
+	if (reg > SATA_PMP_PSCR_CONTROL)
+		return -EINVAL;
+
+	return sata_pmp_write(link, reg, val);
+}
+
+/**
+ *	sata_pmp_std_prereset - prepare PMP link for reset
+ *	@link: link to be reset
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	@link is about to be reset.  Initialize it.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline)
+{
+	struct ata_eh_context *ehc = &link->eh_context;
+	const unsigned long *timing = sata_ehc_deb_timing(ehc);
+	int rc;
+
+	/* force HRST? */
+	if (link->flags & ATA_LFLAG_NO_SRST)
+		ehc->i.action |= ATA_EH_HARDRESET;
+
+	/* handle link resume */
+	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
+	    (link->flags & ATA_LFLAG_HRST_TO_RESUME))
+		ehc->i.action |= ATA_EH_HARDRESET;
+
+	/* if we're about to do hardreset, nothing more to do */
+	if (ehc->i.action & ATA_EH_HARDRESET)
+		return 0;
+
+	/* resume link */
+	rc = sata_link_resume(link, timing, deadline);
+	if (rc) {
+		/* phy resume failed */
+		ata_link_printk(link, KERN_WARNING, "failed to resume link "
+				"for reset (errno=%d)\n", rc);
+		return rc;
+	}
+
+	/* clear SError bits including .X which blocks the port when set */
+	rc = sata_scr_write(link, SCR_ERROR, 0xffffffff);
+	if (rc) {
+		ata_link_printk(link, KERN_ERR,
+				"failed to clear SError (errno=%d)\n", rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+/**
+ *	sata_pmp_std_hardreset - standard hardreset method for PMP link
+ *	@link: link to be reset
+ *	@class: resulting class of attached device
+ *	@deadline: deadline jiffies for the operation
+ *
+ *	Hardreset PMP port @link.  Note that this function doesn't
+ *	wait for BSY clearance.  There simply isn't a generic way to
+ *	wait the event.  Instead, this function return -EAGAIN thus
+ *	telling libata-EH to followup with softreset.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class,
+			   unsigned long deadline)
+{
+	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
+	u32 tmp;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	/* do hardreset */
+	rc = sata_link_hardreset(link, timing, deadline);
+	if (rc) {
+		ata_link_printk(link, KERN_ERR,
+				"COMRESET failed (errno=%d)\n", rc);
+		goto out;
+	}
+
+	/* clear SError bits including .X which blocks the port when set */
+	rc = sata_scr_write(link, SCR_ERROR, 0xffffffff);
+	if (rc) {
+		ata_link_printk(link, KERN_ERR, "failed to clear SError "
+				"during hardreset (errno=%d)\n", rc);
+		goto out;
+	}
+
+	/* if device is present, follow up with srst to wait for !BSY */
+	if (ata_link_online(link))
+		rc = -EAGAIN;
+ out:
+	/* if SCR isn't accessible, we need to reset the PMP */
+	if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp))
+		rc = -ERESTART;
+
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+
+/**
+ *	ata_std_postreset - standard postreset method for PMP link
+ *	@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 sata_pmp_std_postreset(struct ata_link *link, unsigned int *class)
+{
+	u32 serror;
+
+	DPRINTK("ENTER\n");
+
+	/* clear SError */
+	if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
+		sata_scr_write(link, SCR_ERROR, serror);
+
+	/* print link status */
+	sata_print_link_status(link);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	sata_pmp_read_gscr - read GSCR block of SATA PMP
+ *	@dev: PMP device
+ *	@gscr: buffer to read GSCR block into
+ *
+ *	Read selected PMP GSCRs from the PMP at @dev.  This will serve
+ *	as configuration and identification info for the PMP.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
+{
+	static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
+	int i, rc;
+
+	for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
+		int reg = gscr_to_read[i];
+
+		rc = sata_pmp_read(dev->link, reg, &gscr[reg]);
+		if (rc) {
+			ata_dev_printk(dev, KERN_ERR, "failed to read "
+				       "PMP GSCR[%d] (errno=%d)\n", reg, rc);
+			return rc;
+		}
+	}
+
+	return 0;
+}
+
+static const char *sata_pmp_spec_rev_str(const u32 *gscr)
+{
+	u32 rev = gscr[SATA_PMP_GSCR_REV];
+
+	if (rev & (1 << 2))
+		return "1.1";
+	if (rev & (1 << 1))
+		return "1.0";
+	return "<unknown>";
+}
+
+static int sata_pmp_configure(struct ata_device *dev, int print_info)
+{
+	struct ata_port *ap = dev->link->ap;
+	u32 *gscr = dev->gscr;
+	const char *reason;
+	int nr_ports, rc;
+
+	nr_ports = sata_pmp_gscr_ports(gscr);
+
+	if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
+		rc = -EINVAL;
+		reason = "invalid nr_ports";
+		goto fail;
+	}
+
+	if ((ap->flags & ATA_FLAG_AN) &&
+	    (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
+		dev->flags |= ATA_DFLAG_AN;
+
+	/* monitor SERR_PHYRDY_CHG on fan-out ports */
+	rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, SERR_PHYRDY_CHG);
+	if (rc) {
+		reason = "failed to write GSCR_ERROR_EN";
+		goto fail;
+	}
+
+	/* turn off notification till fan-out ports are reset and configured */
+	if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
+		gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
+
+		rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN,
+				    gscr[SATA_PMP_GSCR_FEAT_EN]);
+		if (rc) {
+			reason = "failed to write GSCR_FEAT_EN";
+			goto fail;
+		}
+	}
+
+	if (print_info) {
+		ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
+			       "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
+			       sata_pmp_spec_rev_str(gscr),
+			       sata_pmp_gscr_vendor(gscr),
+			       sata_pmp_gscr_devid(gscr),
+			       sata_pmp_gscr_rev(gscr),
+			       nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
+			       gscr[SATA_PMP_GSCR_FEAT]);
+
+		if (!(dev->flags & ATA_DFLAG_AN))
+			ata_dev_printk(dev, KERN_INFO,
+				"Asynchronous notification not supported, "
+				"hotplug won't\n         work on fan-out "
+				"ports. Use warm-plug instead.\n");
+	}
+
+	return 0;
+
+ fail:
+	ata_dev_printk(dev, KERN_ERR,
+		       "failed to configure Port Multiplier (%s)\n", reason);
+	return rc;
+}
+
+static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
+{
+	struct ata_link *pmp_link = ap->pmp_link;
+	int i;
+
+	if (!pmp_link) {
+		pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
+				   GFP_NOIO);
+		if (!pmp_link)
+			return -ENOMEM;
+
+		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
+			ata_link_init(ap, &pmp_link[i], i);
+
+		ap->pmp_link = pmp_link;
+	}
+
+	for (i = 0; i < nr_ports; i++) {
+		struct ata_link *link = &pmp_link[i];
+		struct ata_eh_context *ehc = &link->eh_context;
+
+		link->flags = 0;
+		ehc->i.probe_mask |= 1;
+		ehc->i.action |= ATA_EH_SOFTRESET;
+		ehc->i.flags |= ATA_EHI_RESUME_LINK;
+	}
+
+	return 0;
+}
+
+static void sata_pmp_quirks(struct ata_port *ap)
+{
+	u32 *gscr = ap->link.device->gscr;
+	u16 vendor = sata_pmp_gscr_vendor(gscr);
+	u16 devid = sata_pmp_gscr_devid(gscr);
+	struct ata_link *link;
+
+	if (vendor == 0x1095 && devid == 0x3726) {
+		/* sil3726 quirks */
+		ata_port_for_each_link(link, ap) {
+			/* SError.N need a kick in the ass to get working */
+			link->flags |= ATA_LFLAG_HRST_TO_RESUME;
+
+			/* class code report is unreliable */
+			if (link->pmp < 5)
+				link->flags |= ATA_LFLAG_ASSUME_ATA;
+
+			/* port 5 is for SEMB device and it doesn't like SRST */
+			if (link->pmp == 5)
+				link->flags |= ATA_LFLAG_NO_SRST |
+					       ATA_LFLAG_ASSUME_SEMB;
+		}
+	} else if (vendor == 0x1095 && devid == 0x4723) {
+		/* sil4723 quirks */
+		ata_port_for_each_link(link, ap) {
+			/* SError.N need a kick in the ass to get working */
+			link->flags |= ATA_LFLAG_HRST_TO_RESUME;
+
+			/* class code report is unreliable */
+			if (link->pmp < 2)
+				link->flags |= ATA_LFLAG_ASSUME_ATA;
+
+			/* the config device at port 2 locks up on SRST */
+			if (link->pmp == 2)
+				link->flags |= ATA_LFLAG_NO_SRST |
+					       ATA_LFLAG_ASSUME_ATA;
+		}
+	} else if (vendor == 0x1095 && devid == 0x4726) {
+		/* sil4726 quirks */
+		ata_port_for_each_link(link, ap) {
+			/* SError.N need a kick in the ass to get working */
+			link->flags |= ATA_LFLAG_HRST_TO_RESUME;
+
+			/* class code report is unreliable */
+			if (link->pmp < 5)
+				link->flags |= ATA_LFLAG_ASSUME_ATA;
+
+			/* The config device, which can be either at
+			 * port 0 or 5, locks up on SRST.
+			 */
+			if (link->pmp == 0 || link->pmp == 5)
+				link->flags |= ATA_LFLAG_NO_SRST |
+					       ATA_LFLAG_ASSUME_ATA;
+
+			/* Port 6 is for SEMB device which doesn't
+			 * like SRST either.
+			 */
+			if (link->pmp == 6)
+				link->flags |= ATA_LFLAG_NO_SRST |
+					       ATA_LFLAG_ASSUME_SEMB;
+		}
+	} else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
+					devid == 0x5734 || devid == 0x5744)) {
+		/* sil5723/5744 quirks */
+
+		/* sil5723/5744 has either two or three downstream
+		 * ports depending on operation mode.  The last port
+		 * is empty if any actual IO device is available or
+		 * occupied by a pseudo configuration device
+		 * otherwise.  Don't try hard to recover it.
+		 */
+		ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
+	} else if (vendor == 0x11ab && devid == 0x4140) {
+		/* Marvell 88SM4140 quirks.  Fan-out ports require PHY
+		 * reset to work; other than that, it behaves very
+		 * nicely.
+		 */
+		ata_port_for_each_link(link, ap)
+			link->flags |= ATA_LFLAG_HRST_TO_RESUME;
+	}
+}
+
+/**
+ *	sata_pmp_attach - attach a SATA PMP device
+ *	@dev: SATA PMP device to attach
+ *
+ *	Configure and attach SATA PMP device @dev.  This function is
+ *	also responsible for allocating and initializing PMP links.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_pmp_attach(struct ata_device *dev)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = link->ap;
+	unsigned long flags;
+	struct ata_link *tlink;
+	int rc;
+
+	/* is it hanging off the right place? */
+	if (!(ap->flags & ATA_FLAG_PMP)) {
+		ata_dev_printk(dev, KERN_ERR,
+			       "host does not support Port Multiplier\n");
+		return -EINVAL;
+	}
+
+	if (!ata_is_host_link(link)) {
+		ata_dev_printk(dev, KERN_ERR,
+			       "Port Multipliers cannot be nested\n");
+		return -EINVAL;
+	}
+
+	if (dev->devno) {
+		ata_dev_printk(dev, KERN_ERR,
+			       "Port Multiplier must be the first device\n");
+		return -EINVAL;
+	}
+
+	WARN_ON(link->pmp != 0);
+	link->pmp = SATA_PMP_CTRL_PORT;
+
+	/* read GSCR block */
+	rc = sata_pmp_read_gscr(dev, dev->gscr);
+	if (rc)
+		goto fail;
+
+	/* config PMP */
+	rc = sata_pmp_configure(dev, 1);
+	if (rc)
+		goto fail;
+
+	rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
+	if (rc) {
+		ata_dev_printk(dev, KERN_INFO,
+			       "failed to initialize PMP links\n");
+		goto fail;
+	}
+
+	/* attach it */
+	spin_lock_irqsave(ap->lock, flags);
+	WARN_ON(ap->nr_pmp_links);
+	ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	sata_pmp_quirks(ap);
+
+	if (ap->ops->pmp_attach)
+		ap->ops->pmp_attach(ap);
+
+	ata_port_for_each_link(tlink, ap)
+		sata_link_init_spd(tlink);
+
+	return 0;
+
+ fail:
+	link->pmp = 0;
+	return rc;
+}
+
+/**
+ *	sata_pmp_detach - detach a SATA PMP device
+ *	@dev: SATA PMP device to detach
+ *
+ *	Detach SATA PMP device @dev.  This function is also
+ *	responsible for deconfiguring PMP links.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void sata_pmp_detach(struct ata_device *dev)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = link->ap;
+	struct ata_link *tlink;
+	unsigned long flags;
+
+	ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
+
+	WARN_ON(!ata_is_host_link(link) || dev->devno ||
+		link->pmp != SATA_PMP_CTRL_PORT);
+
+	if (ap->ops->pmp_detach)
+		ap->ops->pmp_detach(ap);
+
+	ata_port_for_each_link(tlink, ap)
+		ata_eh_detach_dev(tlink->device);
+
+	spin_lock_irqsave(ap->lock, flags);
+	ap->nr_pmp_links = 0;
+	link->pmp = 0;
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	sata_pmp_same_pmp - does new GSCR matches the configured PMP?
+ *	@dev: PMP device to compare against
+ *	@new_gscr: GSCR block of the new device
+ *
+ *	Compare @new_gscr against @dev and determine whether @dev is
+ *	the PMP described by @new_gscr.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if @dev matches @new_gscr, 0 otherwise.
+ */
+static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
+{
+	const u32 *old_gscr = dev->gscr;
+	u16 old_vendor, new_vendor, old_devid, new_devid;
+	int old_nr_ports, new_nr_ports;
+
+	old_vendor = sata_pmp_gscr_vendor(old_gscr);
+	new_vendor = sata_pmp_gscr_vendor(new_gscr);
+	old_devid = sata_pmp_gscr_devid(old_gscr);
+	new_devid = sata_pmp_gscr_devid(new_gscr);
+	old_nr_ports = sata_pmp_gscr_ports(old_gscr);
+	new_nr_ports = sata_pmp_gscr_ports(new_gscr);
+
+	if (old_vendor != new_vendor) {
+		ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
+			       "vendor mismatch '0x%x' != '0x%x'\n",
+			       old_vendor, new_vendor);
+		return 0;
+	}
+
+	if (old_devid != new_devid) {
+		ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
+			       "device ID mismatch '0x%x' != '0x%x'\n",
+			       old_devid, new_devid);
+		return 0;
+	}
+
+	if (old_nr_ports != new_nr_ports) {
+		ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
+			       "nr_ports mismatch '0x%x' != '0x%x'\n",
+			       old_nr_ports, new_nr_ports);
+		return 0;
+	}
+
+	return 1;
+}
+
+/**
+ *	sata_pmp_revalidate - revalidate SATA PMP
+ *	@dev: PMP device to revalidate
+ *	@new_class: new class code
+ *
+ *	Re-read GSCR block and make sure @dev is still attached to the
+ *	port and properly configured.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
+{
+	struct ata_link *link = dev->link;
+	struct ata_port *ap = link->ap;
+	u32 *gscr = (void *)ap->sector_buf;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
+
+	if (!ata_dev_enabled(dev)) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	/* wrong class? */
+	if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	/* read GSCR */
+	rc = sata_pmp_read_gscr(dev, gscr);
+	if (rc)
+		goto fail;
+
+	/* is the pmp still there? */
+	if (!sata_pmp_same_pmp(dev, gscr)) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
+
+	rc = sata_pmp_configure(dev, 0);
+	if (rc)
+		goto fail;
+
+	ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
+
+	DPRINTK("EXIT, rc=0\n");
+	return 0;
+
+ fail:
+	ata_dev_printk(dev, KERN_ERR,
+		       "PMP revalidation failed (errno=%d)\n", rc);
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+
+/**
+ *	sata_pmp_revalidate_quick - revalidate SATA PMP quickly
+ *	@dev: PMP device to revalidate
+ *
+ *	Make sure the attached PMP is accessible.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+static int sata_pmp_revalidate_quick(struct ata_device *dev)
+{
+	u32 prod_id;
+	int rc;
+
+	rc = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
+	if (rc) {
+		ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID\n");
+		return rc;
+	}
+
+	if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
+		ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
+		/* something weird is going on, request full PMP recovery */
+		return -EIO;
+	}
+
+	return 0;
+}
+
+/**
+ *	sata_pmp_eh_recover_pmp - recover PMP
+ *	@ap: ATA port PMP is attached to
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method
+ *	@hardreset: hardreset method
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	Recover PMP attached to @ap.  Recovery procedure is somewhat
+ *	similar to that of ata_eh_recover() except that reset should
+ *	always be performed in hard->soft sequence and recovery
+ *	failure results in PMP detachment.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
+		ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+		ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
+{
+	struct ata_link *link = &ap->link;
+	struct ata_eh_context *ehc = &link->eh_context;
+	struct ata_device *dev = link->device;
+	int tries = ATA_EH_PMP_TRIES;
+	int detach = 0, rc = 0;
+	int reval_failed = 0;
+
+	DPRINTK("ENTER\n");
+
+	if (dev->flags & ATA_DFLAG_DETACH) {
+		detach = 1;
+		goto fail;
+	}
+
+ retry:
+	ehc->classes[0] = ATA_DEV_UNKNOWN;
+
+	if (ehc->i.action & ATA_EH_RESET_MASK) {
+		struct ata_link *tlink;
+
+		ata_eh_freeze_port(ap);
+
+		/* reset */
+		ehc->i.action = ATA_EH_HARDRESET;
+		rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
+				  postreset);
+		if (rc) {
+			ata_link_printk(link, KERN_ERR,
+					"failed to reset PMP, giving up\n");
+			goto fail;
+		}
+
+		ata_eh_thaw_port(ap);
+
+		/* PMP is reset, SErrors cannot be trusted, scan all */
+		ata_port_for_each_link(tlink, ap)
+			ata_ehi_schedule_probe(&tlink->eh_context.i);
+	}
+
+	/* If revalidation is requested, revalidate and reconfigure;
+	 * otherwise, do quick revalidation.
+	 */
+	if (ehc->i.action & ATA_EH_REVALIDATE)
+		rc = sata_pmp_revalidate(dev, ehc->classes[0]);
+	else
+		rc = sata_pmp_revalidate_quick(dev);
+
+	if (rc) {
+		tries--;
+
+		if (rc == -ENODEV) {
+			ehc->i.probe_mask |= 1;
+			detach = 1;
+			/* give it just two more chances */
+			tries = min(tries, 2);
+		}
+
+		if (tries) {
+			int sleep = ehc->i.flags & ATA_EHI_DID_RESET;
+
+			/* consecutive revalidation failures? speed down */
+			if (reval_failed)
+				sata_down_spd_limit(link);
+			else
+				reval_failed = 1;
+
+			ata_dev_printk(dev, KERN_WARNING,
+				       "retrying hardreset%s\n",
+				       sleep ? " in 5 secs" : "");
+			if (sleep)
+				ssleep(5);
+			ehc->i.action |= ATA_EH_HARDRESET;
+			goto retry;
+		} else {
+			ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
+				       "after %d tries, giving up\n",
+				       ATA_EH_PMP_TRIES);
+			goto fail;
+		}
+	}
+
+	/* okay, PMP resurrected */
+	ehc->i.flags = 0;
+
+	DPRINTK("EXIT, rc=0\n");
+	return 0;
+
+ fail:
+	sata_pmp_detach(dev);
+	if (detach)
+		ata_eh_detach_dev(dev);
+	else
+		ata_dev_disable(dev);
+
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+
+static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
+{
+	struct ata_link *link;
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	ata_port_for_each_link(link, ap) {
+		if (!(link->flags & ATA_LFLAG_DISABLED))
+			continue;
+
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		/* Some PMPs require hardreset sequence to get
+		 * SError.N working.
+		 */
+		if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) &&
+		    (link->eh_context.i.flags & ATA_EHI_RESUME_LINK))
+			sata_link_hardreset(link, sata_deb_timing_normal,
+					    jiffies + ATA_TMOUT_INTERNAL_QUICK);
+
+		/* unconditionally clear SError.N */
+		rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
+		if (rc) {
+			ata_link_printk(link, KERN_ERR, "failed to clear "
+					"SError.N (errno=%d)\n", rc);
+			return rc;
+		}
+
+		spin_lock_irqsave(ap->lock, flags);
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	return 0;
+}
+
+static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
+{
+	struct ata_port *ap = link->ap;
+	unsigned long flags;
+
+	if (link_tries[link->pmp] && --link_tries[link->pmp])
+		return 1;
+
+	/* disable this link */
+	if (!(link->flags & ATA_LFLAG_DISABLED)) {
+		ata_link_printk(link, KERN_WARNING,
+			"failed to recover link after %d tries, disabling\n",
+			ATA_EH_PMP_LINK_TRIES);
+
+		spin_lock_irqsave(ap->lock, flags);
+		link->flags |= ATA_LFLAG_DISABLED;
+		spin_unlock_irqrestore(ap->lock, flags);
+	}
+
+	ata_dev_disable(link->device);
+	link->eh_context.i.action = 0;
+
+	return 0;
+}
+
+/**
+ *	sata_pmp_eh_recover - recover PMP-enabled port
+ *	@ap: ATA port to recover
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method
+ *	@hardreset: hardreset method
+ *	@postreset: postreset method (can be NULL)
+ *	@pmp_prereset: PMP prereset method (can be NULL)
+ *	@pmp_softreset: PMP softreset method (can be NULL)
+ *	@pmp_hardreset: PMP hardreset method (can be NULL)
+ *	@pmp_postreset: PMP postreset method (can be NULL)
+ *
+ *	Drive EH recovery operation for PMP enabled port @ap.  This
+ *	function recovers host and PMP ports with proper retrials and
+ *	fallbacks.  Actual recovery operations are performed using
+ *	ata_eh_recover() and sata_pmp_eh_recover_pmp().
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sata_pmp_eh_recover(struct ata_port *ap,
+		ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+		ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
+		ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
+		ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
+{
+	int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
+	struct ata_link *pmp_link = &ap->link;
+	struct ata_device *pmp_dev = pmp_link->device;
+	struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
+	struct ata_link *link;
+	struct ata_device *dev;
+	u32 gscr_error, sntf;
+	int cnt, rc;
+
+	pmp_tries = ATA_EH_PMP_TRIES;
+	ata_port_for_each_link(link, ap)
+		link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
+
+ retry:
+	/* PMP attached? */
+	if (!ap->nr_pmp_links) {
+		rc = ata_eh_recover(ap, prereset, softreset, hardreset,
+				    postreset, NULL);
+		if (rc) {
+			ata_link_for_each_dev(dev, &ap->link)
+				ata_dev_disable(dev);
+			return rc;
+		}
+
+		if (pmp_dev->class != ATA_DEV_PMP)
+			return 0;
+
+		/* new PMP online */
+		ata_port_for_each_link(link, ap)
+			link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
+
+		/* fall through */
+	}
+
+	/* recover pmp */
+	rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset,
+				     postreset);
+	if (rc)
+		goto pmp_fail;
+
+	/* handle disabled links */
+	rc = sata_pmp_eh_handle_disabled_links(ap);
+	if (rc)
+		goto pmp_fail;
+
+	/* recover links */
+	rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset,
+			    pmp_postreset, &link);
+	if (rc)
+		goto link_fail;
+
+	/* Connection status might have changed while resetting other
+	 * links, check SATA_PMP_GSCR_ERROR before returning.
+	 */
+
+	/* clear SNotification */
+	rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
+	if (rc == 0)
+		sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
+
+	/* enable notification */
+	if (pmp_dev->flags & ATA_DFLAG_AN) {
+		pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
+
+		rc = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN,
+				    pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]);
+		if (rc) {
+			ata_dev_printk(pmp_dev, KERN_ERR,
+				       "failed to write PMP_FEAT_EN\n");
+			goto pmp_fail;
+		}
+	}
+
+	/* check GSCR_ERROR */
+	rc = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
+	if (rc) {
+		ata_dev_printk(pmp_dev, KERN_ERR,
+			       "failed to read PMP_GSCR_ERROR\n");
+		goto pmp_fail;
+	}
+
+	cnt = 0;
+	ata_port_for_each_link(link, ap) {
+		if (!(gscr_error & (1 << link->pmp)))
+			continue;
+
+		if (sata_pmp_handle_link_fail(link, link_tries)) {
+			ata_ehi_hotplugged(&link->eh_context.i);
+			cnt++;
+		} else {
+			ata_link_printk(link, KERN_WARNING,
+				"PHY status changed but maxed out on retries, "
+				"giving up\n");
+			ata_link_printk(link, KERN_WARNING,
+				"Manully issue scan to resume this link\n");
+		}
+	}
+
+	if (cnt) {
+		ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
+				"ports, repeating recovery\n");
+		goto retry;
+	}
+
+	return 0;
+
+ link_fail:
+	if (sata_pmp_handle_link_fail(link, link_tries)) {
+		pmp_ehc->i.action |= ATA_EH_HARDRESET;
+		goto retry;
+	}
+
+	/* fall through */
+ pmp_fail:
+	/* Control always ends up here after detaching PMP.  Shut up
+	 * and return if we're unloading.
+	 */
+	if (ap->pflags & ATA_PFLAG_UNLOADING)
+		return rc;
+
+	if (!ap->nr_pmp_links)
+		goto retry;
+
+	if (--pmp_tries) {
+		ata_port_printk(ap, KERN_WARNING,
+				"failed to recover PMP, retrying in 5 secs\n");
+		pmp_ehc->i.action |= ATA_EH_HARDRESET;
+		ssleep(5);
+		goto retry;
+	}
+
+	ata_port_printk(ap, KERN_ERR,
+			"failed to recover PMP after %d tries, giving up\n",
+			ATA_EH_PMP_TRIES);
+	sata_pmp_detach(pmp_dev);
+	ata_dev_disable(pmp_dev);
+
+	return rc;
+}
+
+/**
+ *	sata_pmp_do_eh - do standard error handling for PMP-enabled host
+ *	@ap: host port to handle error for
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method
+ *	@hardreset: hardreset method
+ *	@postreset: postreset method (can be NULL)
+ *	@pmp_prereset: PMP prereset method (can be NULL)
+ *	@pmp_softreset: PMP softreset method (can be NULL)
+ *	@pmp_hardreset: PMP hardreset method (can be NULL)
+ *	@pmp_postreset: PMP postreset method (can be NULL)
+ *
+ *	Perform standard error handling sequence for PMP-enabled host
+ *	@ap.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void sata_pmp_do_eh(struct ata_port *ap,
+		ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+		ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
+		ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
+		ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
+{
+	ata_eh_autopsy(ap);
+	ata_eh_report(ap);
+	sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset,
+			    pmp_prereset, pmp_softreset, pmp_hardreset,
+			    pmp_postreset);
+	ata_eh_finish(ap);
+}
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index ebe22982e80ccf..a9b9c9e1e10502 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -153,6 +153,11 @@ extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
 extern void ata_scsi_dev_rescan(struct work_struct *work);
 extern int ata_bus_probe(struct ata_port *ap);
 
+/* libata-pmp.c */
+extern int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *val);
+extern int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val);
+extern int sata_pmp_attach(struct ata_device *dev);
+
 /* libata-eh.c */
 extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
 extern void ata_scsi_error(struct Scsi_Host *host);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index f9ed198e4fcda3..3cfdb5f676212d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -944,6 +944,25 @@ extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bit
 extern unsigned long ata_pci_default_filter(struct ata_device *, unsigned long);
 #endif /* CONFIG_PCI */
 
+/*
+ * PMP
+ */
+extern void sata_pmp_read_init_tf(struct ata_taskfile *tf,
+				  struct ata_device *dev, int pmp, int reg);
+extern u32 sata_pmp_read_val(const struct ata_taskfile *tf);
+extern void sata_pmp_write_init_tf(struct ata_taskfile *tf,
+				   struct ata_device *dev,
+				   int pmp, int reg, u32 val);
+extern int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline);
+extern int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class,
+				  unsigned long deadline);
+extern void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class);
+extern void sata_pmp_do_eh(struct ata_port *ap,
+		ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+		ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
+		ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
+		ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset);
+
 /*
  * EH
  */