[PATCH] libata CHS: calculate read/write commands and protocol on the fly (revise #6)

     - merge ata_prot_to_cmd() and ata_dev_set_protocol() as
       ata_rwcmd_protocol()
     - pave road for read/write multiple support
     - remove usage of pre-cached command and protocol values and call
       ata_rwcmd_protocol() instead

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>

==============
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 6 insertions, 4 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index ecb7346d0c16..630908c9378b 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -128,6 +128,10 @@ enum {
         ATA_CMD_PIO_READ_EXT    = 0x24,
         ATA_CMD_PIO_WRITE       = 0x30,
         ATA_CMD_PIO_WRITE_EXT   = 0x34,
+        ATA_CMD_READ_MULTI      = 0xC4,
+        ATA_CMD_READ_MULTI_EXT  = 0x29,
+        ATA_CMD_WRITE_MULTI     = 0xC5,
+        ATA_CMD_WRITE_MULTI_EXT = 0x39,
         ATA_CMD_SET_FEATURES    = 0xEF,
         ATA_CMD_PACKET          = 0xA0,
         ATA_CMD_VERIFY          = 0x40,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7929cfc9318d..0261c55f3483 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -283,10 +283,8 @@ struct ata_device {
         u8                      xfer_mode;
         unsigned int            xfer_shift;     /* ATA_SHIFT_xxx */
 
-        /* cache info about current transfer mode */
-        u8                      xfer_protocol;  /* taskfile xfer protocol */
-        u8                      read_cmd;       /* opcode to use on read */
-        u8                      write_cmd;      /* opcode to use on write */
+        unsigned int            multi_count;    /* sectors count for
+                                                   READ/WRITE MULTIPLE */
 
         /* for CHS addressing */
         u16                     cylinders;      /* Number of cylinders */