[libata] check for SATA async notify support

Check to see if an ATAPI device supports Asynchronous Notification.
If so, enable it, if the host controller supports AN.

Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 64 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index c0f3c78a2be0..9f87f7ddd485 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -70,6 +70,7 @@ const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
 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_AN(struct ata_device *dev, u8 enable);
 static void ata_dev_xfermask(struct ata_device *dev);
 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
 
@@ -1987,6 +1988,22 @@ int ata_dev_configure(struct ata_device *dev)
                 }
                 dev->cdb_len = (unsigned int) rc;
 
+                /*
+                 * check to see if this ATAPI device supports
+                 * Asynchronous Notification
+                 */
+                if ((ap->flags & ATA_FLAG_AN) && ata_id_has_AN(id)) {
+                        int err;
+                        /* issue SET feature command to turn this on */
+                        err = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
+                        if (err)
+                                ata_dev_printk(dev, KERN_ERR,
+                                                "unable to set AN, err %x\n",
+                                                err);
+                        else
+                                dev->flags |= ATA_DFLAG_AN;
+                }
+
                 if (ata_id_cdb_intr(dev->id)) {
                         dev->flags |= ATA_DFLAG_CDB_INTR;
                         cdb_intr_string = ", CDB intr";
@@ -3975,6 +3992,42 @@ static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
 }
 
 /**
+ *      ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
+ *      @dev: Device to which command will be sent
+ *      @enable: Whether to enable or disable the feature
+ *
+ *      Issue SET FEATURES - SATA FEATURES command to device @dev
+ *      on port @ap with sector count set to indicate Asynchronous
+ *      Notification feature
+ *
+ *      LOCKING:
+ *      PCI/etc. bus probe sem.
+ *
+ *      RETURNS:
+ *      0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable)
+{
+        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 = SATA_AN;
+
+        err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 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)
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 40c7af05fdb9..fba8e1459832 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -230,6 +230,12 @@ enum {
 
         SETFEATURES_SPINUP      = 0x07, /* Spin-up drive */
 
+        SETFEATURES_SATA_ENABLE = 0x10, /* Enable use of SATA feature */
+        SETFEATURES_SATA_DISABLE = 0x90, /* Disable use of SATA feature */
+
+        /* SETFEATURE Sector counts for SATA features */
+        SATA_AN                 = 0x05,  /* Asynchronous Notification */
+
         /* ATAPI stuff */
         ATAPI_PKT_DMA           = (1 << 0),
         ATAPI_DMADIR            = (1 << 2),     /* ATAPI data dir:
@@ -357,6 +363,9 @@ struct ata_taskfile {
 #define ata_id_queue_depth(id)  (((id)[75] & 0x1f) + 1)
 #define ata_id_removeable(id)   ((id)[0] & (1 << 7))
 #define ata_id_has_dword_io(id) ((id)[50] & (1 << 0))
+#define ata_id_has_AN(id)       \
+        ( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
+          ((id)[78] & (1 << 5)) )
 #define ata_id_iordy_disable(id) ((id)[49] & (1 << 10))
 #define ata_id_has_iordy(id) ((id)[49] & (1 << 11))
 #define ata_id_u32(id,n)        \
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7a1793bd2371..6dd5b437210d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -139,6 +139,7 @@ enum {
         ATA_DFLAG_FLUSH_EXT     = (1 << 4), /* do FLUSH_EXT instead of FLUSH */
         ATA_DFLAG_ACPI_PENDING  = (1 << 5), /* ACPI resume action pending */
         ATA_DFLAG_ACPI_FAILED   = (1 << 6), /* ACPI on devcfg has failed */
+        ATA_DFLAG_AN            = (1 << 7), /* device supports AN */
         ATA_DFLAG_CFG_MASK      = (1 << 8) - 1,
 
         ATA_DFLAG_PIO           = (1 << 8), /* device limited to PIO mode */
@@ -179,6 +180,7 @@ enum {
         ATA_FLAG_IGN_SIMPLEX    = (1 << 15), /* ignore SIMPLEX */
         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 */
 
         /* The following flag belongs to ap->pflags but is kept in
          * ap->flags because it's referenced in many LLDs and will be