libata: add ATAPI_* cmd types and implement atapi_cmd_type()

Add ATAPI command types - ATAPI_READ, WRITE, RW_BUF, READ_CD and MISC,
and implement atapi_cmd_type() which takes SCSI opcode and returns to
which class the opcode belongs.  This will be used later to improve
ATAPI handling.

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

1 files changed, 28 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index cc4eaef6f889..03afcd63202d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -35,6 +35,7 @@
 #include <linux/workqueue.h>
 #include <scsi/scsi_host.h>
 #include <linux/acpi.h>
+#include <linux/cdrom.h>
 
 /*
  * Define if arch has non-standard setup.  This is a _PCI_ standard
@@ -346,6 +347,12 @@ enum {
         ATA_DMA_MASK_ATA        = (1 << 0),     /* DMA on ATA Disk */
         ATA_DMA_MASK_ATAPI      = (1 << 1),     /* DMA on ATAPI */
         ATA_DMA_MASK_CFA        = (1 << 2),     /* DMA on CF Card */
+
+        /* ATAPI command types */
+        ATAPI_READ              = 0,            /* READs */
+        ATAPI_WRITE             = 1,            /* WRITEs */
+        ATAPI_READ_CD           = 2,            /* READ CD [MSF] */
+        ATAPI_MISC              = 3,            /* the rest */
 };
 
 enum ata_xfer_mask {
@@ -1408,6 +1415,27 @@ static inline int ata_try_flush_cache(const struct ata_device *dev)
                ata_id_has_flush_ext(dev->id);
 }
 
+static inline 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;
+
+        default:
+                return ATAPI_MISC;
+        }
+}
+
 static inline unsigned int ac_err_mask(u8 status)
 {
         if (status & (ATA_BUSY | ATA_DRQ))