libata-pmp-prep: add PMP related constants, fields, ops and update helpers

Add PMP related constants, fields and ops.  Also, update
ata_class_enabled/disabled() such that PMP classes are considered.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 26 insertions, 4 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 3ab2196c651a..c3820f105ffa 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -155,7 +155,11 @@ enum {
         ATA_DEV_ATA_UNSUP       = 2,    /* ATA device (unsupported) */
         ATA_DEV_ATAPI           = 3,    /* ATAPI device */
         ATA_DEV_ATAPI_UNSUP     = 4,    /* ATAPI device (unsupported) */
-        ATA_DEV_NONE            = 5,    /* no device */
+        ATA_DEV_PMP             = 5,    /* SATA port multiplier */
+        ATA_DEV_PMP_UNSUP       = 6,    /* SATA port multiplier (unsupported) */
+        ATA_DEV_SEMB            = 7,    /* SEMB */
+        ATA_DEV_SEMB_UNSUP      = 8,    /* SEMB (unsupported) */
+        ATA_DEV_NONE            = 9,    /* no device */
 
         /* struct ata_link flags */
         ATA_LFLAG_HRST_TO_RESUME = (1 << 0), /* hardreset to resume link */
@@ -181,6 +185,7 @@ enum {
         ATA_FLAG_NO_IORDY       = (1 << 16), /* controller lacks iordy */
         ATA_FLAG_ACPI_SATA      = (1 << 17), /* need native SATA ACPI layout */
         ATA_FLAG_AN             = (1 << 18), /* controller supports AN */
+        ATA_FLAG_PMP            = (1 << 19), /* controller supports PMP */
 
         /* The following flag belongs to ap->pflags but is kept in
          * ap->flags because it's referenced in many LLDs and will be
@@ -299,6 +304,10 @@ enum {
         /* how hard are we gonna try to probe/recover devices */
         ATA_PROBE_MAX_TRIES     = 3,
         ATA_EH_DEV_TRIES        = 3,
+        ATA_EH_PMP_TRIES        = 5,
+        ATA_EH_PMP_LINK_TRIES   = 3,
+
+        SATA_PMP_SCR_TIMEOUT    = 250,
 
         /* Horkage types. May be set by libata or controller on drives
            (some horkage may be drive/controller pair dependant */
@@ -450,7 +459,12 @@ struct ata_device {
         /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
         u64                     n_sectors;      /* size of device, if ATA */
         unsigned int            class;          /* ATA_DEV_xxx */
-        u16                     id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
+
+        union {
+                u16             id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
+                u32             gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */
+        };
+
         u8                      pio_mode;
         u8                      dma_mode;
         u8                      xfer_mode;
@@ -628,6 +642,12 @@ struct ata_port_operations {
         void (*qc_prep) (struct ata_queued_cmd *qc);
         unsigned int (*qc_issue) (struct ata_queued_cmd *qc);
 
+        /* port multiplier */
+        void (*pmp_attach) (struct ata_port *ap);
+        void (*pmp_detach) (struct ata_port *ap);
+        int (*pmp_read) (struct ata_device *dev, int pmp, int reg, u32 *r_val);
+        int (*pmp_write) (struct ata_device *dev, int pmp, int reg, u32 val);
+
         /* Error handlers.  ->error_handler overrides ->eng_timeout and
          * indicates that new-style EH is in place.
          */
@@ -1033,12 +1053,14 @@ static inline unsigned int ata_tag_internal(unsigned int tag)
  */
 static inline unsigned int ata_class_enabled(unsigned int class)
 {
-        return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
+        return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI ||
+                class == ATA_DEV_PMP || class == ATA_DEV_SEMB;
 }
 
 static inline unsigned int ata_class_disabled(unsigned int class)
 {
-        return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP;
+        return class == ATA_DEV_ATA_UNSUP || class == ATA_DEV_ATAPI_UNSUP ||
+                class == ATA_DEV_PMP_UNSUP || class == ATA_DEV_SEMB_UNSUP;
 }
 
 static inline unsigned int ata_class_absent(unsigned int class)