--- /dev/null
+/*
+ * 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);
+}
projects / linux-2.6 / commitdiff