[PATCH] libata: Add CompactFlash support

The CFA world has some additional rules and drive modes we need to support for
newer expansion cards and on embedded boxes

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index 8d708a3d505b..991b858acc30 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -170,12 +170,16 @@ enum {
         XFER_UDMA_2             = 0x42,
         XFER_UDMA_1             = 0x41,
         XFER_UDMA_0             = 0x40,
+        XFER_MW_DMA_4           = 0x24, /* CFA only */
+        XFER_MW_DMA_3           = 0x23, /* CFA only */
         XFER_MW_DMA_2           = 0x22,
         XFER_MW_DMA_1           = 0x21,
         XFER_MW_DMA_0           = 0x20,
         XFER_SW_DMA_2           = 0x12,
         XFER_SW_DMA_1           = 0x11,
         XFER_SW_DMA_0           = 0x10,
+        XFER_PIO_6              = 0x0E, /* CFA only */
+        XFER_PIO_5              = 0x0D, /* CFA only */
         XFER_PIO_4              = 0x0C,
         XFER_PIO_3              = 0x0B,
         XFER_PIO_2              = 0x0A,
@@ -274,7 +278,6 @@ struct ata_taskfile {
 };
 
 #define ata_id_is_ata(id)       (((id)[0] & (1 << 15)) == 0)
-#define ata_id_is_cfa(id)       ((id)[0] == 0x848A)
 #define ata_id_is_sata(id)      ((id)[93] == 0)
 #define ata_id_rahead_enabled(id) ((id)[85] & (1 << 6))
 #define ata_id_wcache_enabled(id) ((id)[85] & (1 << 5))
@@ -306,6 +309,9 @@ static inline unsigned int ata_id_major_version(const u16 *id)
 {
         unsigned int mver;
 
+        if (id[ATA_ID_MAJOR_VER] == 0xFFFF)
+                return 0;
+
         for (mver = 14; mver >= 1; mver--)
                 if (id[ATA_ID_MAJOR_VER] & (1 << mver))
                         break;
@@ -324,6 +330,18 @@ static inline int ata_id_current_chs_valid(const u16 *id)
                 id[56];    /* sectors in current translation */
 }
 
+static inline int ata_id_is_cfa(const u16 *id)
+{
+        u16 v = id[0];
+        if (v == 0x848A)        /* Standard CF */
+                return 1;
+        /* Could be CF hiding as standard ATA */
+        if (ata_id_major_version(id) >= 3 &&  id[82] != 0xFFFF &&
+                        (id[82] & ( 1 << 2)))
+                return 1;
+        return 0;
+}
+
 static inline int atapi_cdb_len(const u16 *dev_id)
 {
         u16 tmp = dev_id[0] & 0x3;