Hi Jeff, These are the patches for libata CHS support. Tested OK with my old 1994 ST-5850A hardddisk.
Changes:
1. Add the flags, utility function and CHS fields to the <linux/ata.h> and
<linux/libata.h> headers.
2. ata_dev_identify() pathed to report and initialize CHS fields in ata_device.
ata_qc_new_init() patched to initialize the ATA_TFLAG_LBA to the
ata_taskfile.
3. ata_scsi_verify_xlat(), ata_scsi_rw_xlat() patched to support CHS
translation.
ata_scsiop_read_cap() patched to report capacity for CHS-only drives.
Attached please find the patch 1/3 against the libata-dev-2.6 tree for your
review. Thanks.
Albert
Signed-off-by: Albert Lee <[EMAIL PROTECTED]>
----------------------------------------------------------------------------------------------
diff -Nru libata-dev-2.6/include/linux/ata.h
libata-dev-2.6-mod/include/linux/ata.h
--- libata-dev-2.6/include/linux/ata.h 2005-02-05 10:42:06.000000000 +0800
+++ libata-dev-2.6-mod/include/linux/ata.h 2005-02-05 11:04:33.000000000 +0800
@@ -172,6 +172,7 @@
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 {
@@ -241,6 +242,18 @@
((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 -Nru libata-dev-2.6/include/linux/libata.h
libata-dev-2.6-mod/include/linux/libata.h
--- libata-dev-2.6/include/linux/libata.h 2005-02-05 10:42:07.000000000 +0800
+++ libata-dev-2.6-mod/include/linux/libata.h 2005-02-05 11:05:58.000000000
+0800
@@ -95,6 +95,7 @@
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 */
@@ -279,6 +280,11 @@
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 {
chs1.diff
Description: Binary data
