[libata] C/H/S support, for older devices

2 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index f178894edd..d8981402cd 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -125,6 +125,7 @@ enum {
         ATA_CMD_PACKET          = 0xA0,
         ATA_CMD_VERIFY          = 0x40,
         ATA_CMD_VERIFY_EXT      = 0x42,
+        ATA_CMD_INIT_DEV_PARAMS = 0x91,
 
         /* SETFEATURES stuff */
         SETFEATURES_XFER        = 0x03,
@@ -174,6 +175,7 @@ enum {
         ATA_TFLAG_ISADDR        = (1 << 1), /* enable r/w to nsect/lba regs */
         ATA_TFLAG_DEVICE        = (1 << 2), /* enable r/w to device reg */
         ATA_TFLAG_WRITE         = (1 << 3), /* data dir: host->dev==1 (write) */
+        ATA_TFLAG_LBA           = (1 << 4), /* enable LBA */
 };
 
 enum ata_tf_protocols {
@@ -242,6 +244,18 @@ struct ata_taskfile {
           ((u64) (id)[(n) + 1] << 16) | \
           ((u64) (id)[(n) + 0]) )
 
+static inline int ata_id_current_chs_valid(u16 *id)
+{
+        /* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command 
+           has not been issued to the device then the values of 
+           id[54] to id[56] are vendor specific. */
+        return (id[53] & 0x01) && /* Current translation valid */
+                id[54] &&  /* cylinders in current translation */
+                id[55] &&  /* heads in current translation */
+                id[55] <= 16 &&
+                id[56];    /* sectors in current translation */
+}
+
 static inline int atapi_cdb_len(u16 *dev_id)
 {
         u16 tmp = dev_id[0] & 0x3;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 505160ab47..bd0df84cfd 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -95,6 +95,7 @@ enum {
         ATA_DFLAG_LBA48         = (1 << 0), /* device supports LBA48 */
         ATA_DFLAG_PIO           = (1 << 1), /* device currently in PIO mode */
         ATA_DFLAG_LOCK_SECTORS  = (1 << 2), /* don't adjust max_sectors */
+        ATA_DFLAG_LBA           = (1 << 3), /* device supports LBA */
 
         ATA_DEV_UNKNOWN         = 0,    /* unknown device */
         ATA_DEV_ATA             = 1,    /* ATA device */
@@ -278,6 +279,11 @@ struct ata_device {
         u8                      xfer_protocol;  /* taskfile xfer protocol */
         u8                      read_cmd;       /* opcode to use on read */
         u8                      write_cmd;      /* opcode to use on write */
+
+        /* for CHS addressing */
+        u16                     cylinders;      /* Number of cylinders */
+        u16                     heads;          /* Number of heads */
+        u16                     sectors;        /* Number of sectors per track */
 };
 
 struct ata_port {