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-rw-r--r--drivers/scsi/libata-core.c140
-rw-r--r--drivers/scsi/libata-scsi.c280
-rw-r--r--include/linux/ata.h14
-rw-r--r--include/linux/libata.h6
4 files changed, 312 insertions, 128 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 0b5d3a5b7eda..96355b05fe5c 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -52,6 +52,7 @@
static unsigned int ata_busy_sleep (struct ata_port *ap,
unsigned long tmout_pat,
unsigned long tmout);
+static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev);
static void ata_set_mode(struct ata_port *ap);
static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev);
static unsigned int ata_get_mode_mask(struct ata_port *ap, int shift);
@@ -1008,7 +1009,7 @@ static inline void ata_dump_id(struct ata_device *dev)
static void ata_dev_identify(struct ata_port *ap, unsigned int device)
{
struct ata_device *dev = &ap->device[device];
- unsigned int i;
+ unsigned int major_version;
u16 tmp;
unsigned long xfer_modes;
u8 status;
@@ -1106,9 +1107,9 @@ retry:
* common ATA, ATAPI feature tests
*/
- /* we require LBA and DMA support (bits 8 & 9 of word 49) */
- if (!ata_id_has_dma(dev->id) || !ata_id_has_lba(dev->id)) {
- printk(KERN_DEBUG "ata%u: no dma/lba\n", ap->id);
+ /* we require DMA support (bits 8 of word 49) */
+ if (!ata_id_has_dma(dev->id)) {
+ printk(KERN_DEBUG "ata%u: no dma\n", ap->id);
goto err_out_nosup;
}
@@ -1128,32 +1129,69 @@ retry:
if (!ata_id_is_ata(dev->id)) /* sanity check */
goto err_out_nosup;
+ /* get major version */
tmp = dev->id[ATA_ID_MAJOR_VER];
- for (i = 14; i >= 1; i--)
- if (tmp & (1 << i))
+ for (major_version = 14; major_version >= 1; major_version--)
+ if (tmp & (1 << major_version))
break;
- /* we require at least ATA-3 */
- if (i < 3) {
- printk(KERN_DEBUG "ata%u: no ATA-3\n", ap->id);
- goto err_out_nosup;
- }
+ /*
+ * The exact sequence expected by certain pre-ATA4 drives is:
+ * SRST RESET
+ * IDENTIFY
+ * INITIALIZE DEVICE PARAMETERS
+ * anything else..
+ * Some drives were very specific about that exact sequence.
+ */
+ if (major_version < 4 || (!ata_id_has_lba(dev->id)))
+ ata_dev_init_params(ap, dev);
+
+ if (ata_id_has_lba(dev->id)) {
+ dev->flags |= ATA_DFLAG_LBA;
+
+ if (ata_id_has_lba48(dev->id)) {
+ dev->flags |= ATA_DFLAG_LBA48;
+ dev->n_sectors = ata_id_u64(dev->id, 100);
+ } else {
+ dev->n_sectors = ata_id_u32(dev->id, 60);
+ }
+
+ /* print device info to dmesg */
+ printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors:%s\n",
+ ap->id, device,
+ major_version,
+ ata_mode_string(xfer_modes),
+ (unsigned long long)dev->n_sectors,
+ dev->flags & ATA_DFLAG_LBA48 ? " LBA48" : " LBA");
+ } else {
+ /* CHS */
+
+ /* Default translation */
+ dev->cylinders = dev->id[1];
+ dev->heads = dev->id[3];
+ dev->sectors = dev->id[6];
+ dev->n_sectors = dev->cylinders * dev->heads * dev->sectors;
+
+ if (ata_id_current_chs_valid(dev->id)) {
+ /* Current CHS translation is valid. */
+ dev->cylinders = dev->id[54];
+ dev->heads = dev->id[55];
+ dev->sectors = dev->id[56];
+
+ dev->n_sectors = ata_id_u32(dev->id, 57);
+ }
+
+ /* print device info to dmesg */
+ printk(KERN_INFO "ata%u: dev %u ATA-%d, max %s, %Lu sectors: CHS %d/%d/%d\n",
+ ap->id, device,
+ major_version,
+ ata_mode_string(xfer_modes),
+ (unsigned long long)dev->n_sectors,
+ (int)dev->cylinders, (int)dev->heads, (int)dev->sectors);
- if (ata_id_has_lba48(dev->id)) {
- dev->flags |= ATA_DFLAG_LBA48;
- dev->n_sectors = ata_id_u64(dev->id, 100);
- } else {
- dev->n_sectors = ata_id_u32(dev->id, 60);
}
ap->host->max_cmd_len = 16;
-
- /* print device info to dmesg */
- printk(KERN_INFO "ata%u: dev %u ATA, max %s, %Lu sectors:%s\n",
- ap->id, device,
- ata_mode_string(xfer_modes),
- (unsigned long long)dev->n_sectors,
- dev->flags & ATA_DFLAG_LBA48 ? " lba48" : "");
}
/* ATAPI-specific feature tests */
@@ -1947,6 +1985,54 @@ static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
}
/**
+ * ata_dev_init_params - Issue INIT DEV PARAMS command
+ * @ap: Port associated with device @dev
+ * @dev: Device to which command will be sent
+ *
+ * LOCKING:
+ */
+
+static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev)
+{
+ DECLARE_COMPLETION(wait);
+ struct ata_queued_cmd *qc;
+ int rc;
+ unsigned long flags;
+ u16 sectors = dev->id[6];
+ u16 heads = dev->id[3];
+
+ /* Number of sectors per track 1-255. Number of heads 1-16 */
+ if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
+ return;
+
+ /* set up init dev params taskfile */
+ DPRINTK("init dev params \n");
+
+ qc = ata_qc_new_init(ap, dev);
+ BUG_ON(qc == NULL);
+
+ qc->tf.command = ATA_CMD_INIT_DEV_PARAMS;
+ qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ qc->tf.protocol = ATA_PROT_NODATA;
+ qc->tf.nsect = sectors;
+ qc->tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
+
+ qc->waiting = &wait;
+ qc->complete_fn = ata_qc_complete_noop;
+
+ spin_lock_irqsave(&ap->host_set->lock, flags);
+ rc = ata_qc_issue(qc);
+ spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
+ if (rc)
+ ata_port_disable(ap);
+ else
+ wait_for_completion(&wait);
+
+ DPRINTK("EXIT\n");
+}
+
+/**
* ata_sg_clean -
* @qc:
*
@@ -2736,8 +2822,12 @@ struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
ata_tf_init(ap, &qc->tf, dev->devno);
- if (dev->flags & ATA_DFLAG_LBA48)
- qc->tf.flags |= ATA_TFLAG_LBA48;
+ if (dev->flags & ATA_DFLAG_LBA) {
+ qc->tf.flags |= ATA_TFLAG_LBA;
+
+ if (dev->flags & ATA_DFLAG_LBA48)
+ qc->tf.flags |= ATA_TFLAG_LBA48;
+ }
}
return qc;
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 4c96df060c3b..8b065ef0e39a 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -435,77 +435,107 @@ static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
{
struct ata_taskfile *tf = &qc->tf;
+ struct ata_device *dev = qc->dev;
+ unsigned int lba = tf->flags & ATA_TFLAG_LBA;
unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48;
u64 dev_sectors = qc->dev->n_sectors;
- u64 sect = 0;
- u32 n_sect = 0;
+ u64 block = 0;
+ u32 n_block = 0;
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->protocol = ATA_PROT_NODATA;
- tf->device |= ATA_LBA;
if (scsicmd[0] == VERIFY) {
- sect |= ((u64)scsicmd[2]) << 24;
- sect |= ((u64)scsicmd[3]) << 16;
- sect |= ((u64)scsicmd[4]) << 8;
- sect |= ((u64)scsicmd[5]);
+ block |= ((u64)scsicmd[2]) << 24;
+ block |= ((u64)scsicmd[3]) << 16;
+ block |= ((u64)scsicmd[4]) << 8;
+ block |= ((u64)scsicmd[5]);
- n_sect |= ((u32)scsicmd[7]) << 8;
- n_sect |= ((u32)scsicmd[8]);
+ n_block |= ((u32)scsicmd[7]) << 8;
+ n_block |= ((u32)scsicmd[8]);
}
else if (scsicmd[0] == VERIFY_16) {
- sect |= ((u64)scsicmd[2]) << 56;
- sect |= ((u64)scsicmd[3]) << 48;
- sect |= ((u64)scsicmd[4]) << 40;
- sect |= ((u64)scsicmd[5]) << 32;
- sect |= ((u64)scsicmd[6]) << 24;
- sect |= ((u64)scsicmd[7]) << 16;
- sect |= ((u64)scsicmd[8]) << 8;
- sect |= ((u64)scsicmd[9]);
-
- n_sect |= ((u32)scsicmd[10]) << 24;
- n_sect |= ((u32)scsicmd[11]) << 16;
- n_sect |= ((u32)scsicmd[12]) << 8;
- n_sect |= ((u32)scsicmd[13]);
+ block |= ((u64)scsicmd[2]) << 56;
+ block |= ((u64)scsicmd[3]) << 48;
+ block |= ((u64)scsicmd[4]) << 40;
+ block |= ((u64)scsicmd[5]) << 32;
+ block |= ((u64)scsicmd[6]) << 24;
+ block |= ((u64)scsicmd[7]) << 16;
+ block |= ((u64)scsicmd[8]) << 8;
+ block |= ((u64)scsicmd[9]);
+
+ n_block |= ((u32)scsicmd[10]) << 24;
+ n_block |= ((u32)scsicmd[11]) << 16;
+ n_block |= ((u32)scsicmd[12]) << 8;
+ n_block |= ((u32)scsicmd[13]);
}
else
return 1;
- if (!n_sect)
+ if (!n_block)
return 1;
- if (sect >= dev_sectors)
+ if (block >= dev_sectors)
return 1;
- if ((sect + n_sect) > dev_sectors)
+ if ((block + n_block) > dev_sectors)
return 1;
if (lba48) {
- if (n_sect > (64 * 1024))
+ if (n_block > (64 * 1024))
return 1;
} else {
- if (n_sect > 256)
+ if (n_block > 256)
return 1;
}
- if (lba48) {
- tf->command = ATA_CMD_VERIFY_EXT;
+ if (lba) {
+ if (lba48) {
+ tf->command = ATA_CMD_VERIFY_EXT;
- tf->hob_nsect = (n_sect >> 8) & 0xff;
+ tf->hob_nsect = (n_block >> 8) & 0xff;
- tf->hob_lbah = (sect >> 40) & 0xff;
- tf->hob_lbam = (sect >> 32) & 0xff;
- tf->hob_lbal = (sect >> 24) & 0xff;
- } else {
- tf->command = ATA_CMD_VERIFY;
+ tf->hob_lbah = (block >> 40) & 0xff;
+ tf->hob_lbam = (block >> 32) & 0xff;
+ tf->hob_lbal = (block >> 24) & 0xff;
+ } else {
+ tf->command = ATA_CMD_VERIFY;
- tf->device |= (sect >> 24) & 0xf;
- }
+ tf->device |= (block >> 24) & 0xf;
+ }
+
+ tf->nsect = n_block & 0xff;
- tf->nsect = n_sect & 0xff;
+ tf->lbah = (block >> 16) & 0xff;
+ tf->lbam = (block >> 8) & 0xff;
+ tf->lbal = block & 0xff;
- tf->lbah = (sect >> 16) & 0xff;
- tf->lbam = (sect >> 8) & 0xff;
- tf->lbal = sect & 0xff;
+ tf->device |= ATA_LBA;
+ } else {
+ /* CHS */
+ u32 sect, head, cyl, track;
+
+ /* Convert LBA to CHS */
+ track = (u32)block / dev->sectors;
+ cyl = track / dev->heads;
+ head = track % dev->heads;
+ sect = (u32)block % dev->sectors + 1;
+
+ DPRINTK("block[%u] track[%u] cyl[%u] head[%u] sect[%u] \n", (u32)block, track, cyl, head, sect);
+
+ /* Check whether the converted CHS can fit.
+ Cylinder: 0-65535
+ Head: 0-15
+ Sector: 1-255*/
+ if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
+ return 1;
+
+ tf->command = ATA_CMD_VERIFY;
+ tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
+ tf->lbal = sect;
+ tf->lbam = cyl;
+ tf->lbah = cyl >> 8;
+ tf->device |= head;
+ }
return 0;
}
@@ -533,11 +563,14 @@ static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
{
struct ata_taskfile *tf = &qc->tf;
+ struct ata_device *dev = qc->dev;
+ unsigned int lba = tf->flags & ATA_TFLAG_LBA;
unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48;
+ u64 block = 0;
+ u32 n_block = 0;
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->protocol = qc->dev->xfer_protocol;
- tf->device |= ATA_LBA;
if (scsicmd[0] == READ_10 || scsicmd[0] == READ_6 ||
scsicmd[0] == READ_16) {
@@ -547,80 +580,111 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
tf->flags |= ATA_TFLAG_WRITE;
}
+ /* Calculate the SCSI LBA and transfer length. */
if (scsicmd[0] == READ_10 || scsicmd[0] == WRITE_10) {
- if (lba48) {
- tf->hob_nsect = scsicmd[7];
- tf->hob_lbal = scsicmd[2];
-
- qc->nsect = ((unsigned int)scsicmd[7] << 8) |
- scsicmd[8];
- } else {
- /* if we don't support LBA48 addressing, the request
- * -may- be too large. */
- if ((scsicmd[2] & 0xf0) || scsicmd[7])
- return 1;
-
- /* stores LBA27:24 in lower 4 bits of device reg */
- tf->device |= scsicmd[2];
+ block |= ((u64)scsicmd[2]) << 24;
+ block |= ((u64)scsicmd[3]) << 16;
+ block |= ((u64)scsicmd[4]) << 8;
+ block |= ((u64)scsicmd[5]);
- qc->nsect = scsicmd[8];
- }
-
- tf->nsect = scsicmd[8];
- tf->lbal = scsicmd[5];
- tf->lbam = scsicmd[4];
- tf->lbah = scsicmd[3];
+ n_block |= ((u32)scsicmd[7]) << 8;
+ n_block |= ((u32)scsicmd[8]);
VPRINTK("ten-byte command\n");
- return 0;
- }
-
- if (scsicmd[0] == READ_6 || scsicmd[0] == WRITE_6) {
- qc->nsect = tf->nsect = scsicmd[4];
- tf->lbal = scsicmd[3];
- tf->lbam = scsicmd[2];
- tf->lbah = scsicmd[1] & 0x1f; /* mask out reserved bits */
-
+ } else if (scsicmd[0] == READ_6 || scsicmd[0] == WRITE_6) {
+ block |= ((u64)scsicmd[2]) << 8;
+ block |= ((u64)scsicmd[3]);
+ n_block |= ((u32)scsicmd[4]);
+
VPRINTK("six-byte command\n");
- return 0;
+ } else if (scsicmd[0] == READ_16 || scsicmd[0] == WRITE_16) {
+ block |= ((u64)scsicmd[2]) << 56;
+ block |= ((u64)scsicmd[3]) << 48;
+ block |= ((u64)scsicmd[4]) << 40;
+ block |= ((u64)scsicmd[5]) << 32;
+ block |= ((u64)scsicmd[6]) << 24;
+ block |= ((u64)scsicmd[7]) << 16;
+ block |= ((u64)scsicmd[8]) << 8;
+ block |= ((u64)scsicmd[9]);
+
+ n_block |= ((u32)scsicmd[10]) << 24;
+ n_block |= ((u32)scsicmd[11]) << 16;
+ n_block |= ((u32)scsicmd[12]) << 8;
+ n_block |= ((u32)scsicmd[13]);
+
+ VPRINTK("sixteen-byte command\n");
+ } else {
+ DPRINTK("no-byte command\n");
+ return 1;
}
- if (scsicmd[0] == READ_16 || scsicmd[0] == WRITE_16) {
- /* rule out impossible LBAs and sector counts */
- if (scsicmd[2] || scsicmd[3] || scsicmd[10] || scsicmd[11])
- return 1;
+ /* Check and compose ATA command */
+ if (!n_block)
+ /* In ATA, sector count 0 means 256 or 65536 sectors, not 0 sectors. */
+ return 1;
+ if (lba) {
if (lba48) {
- tf->hob_nsect = scsicmd[12];
- tf->hob_lbal = scsicmd[6];
- tf->hob_lbam = scsicmd[5];
- tf->hob_lbah = scsicmd[4];
-
- qc->nsect = ((unsigned int)scsicmd[12] << 8) |
- scsicmd[13];
- } else {
- /* once again, filter out impossible non-zero values */
- if (scsicmd[4] || scsicmd[5] || scsicmd[12] ||
- (scsicmd[6] & 0xf0))
+ /* The request -may- be too large for LBA48. */
+ if ((block >> 48) || (n_block > 65536))
return 1;
- /* stores LBA27:24 in lower 4 bits of device reg */
- tf->device |= scsicmd[6];
+ tf->hob_nsect = (n_block >> 8) & 0xff;
+
+ tf->hob_lbah = (block >> 40) & 0xff;
+ tf->hob_lbam = (block >> 32) & 0xff;
+ tf->hob_lbal = (block >> 24) & 0xff;
+ } else {
+ /* LBA28 */
+
+ /* The request -may- be too large for LBA28. */
+ if ((block >> 28) || (n_block > 256))
+ return 1;
- qc->nsect = scsicmd[13];
+ tf->device |= (block >> 24) & 0xf;
}
+
+ qc->nsect = n_block;
+ tf->nsect = n_block & 0xff;
- tf->nsect = scsicmd[13];
- tf->lbal = scsicmd[9];
- tf->lbam = scsicmd[8];
- tf->lbah = scsicmd[7];
+ tf->lbah = (block >> 16) & 0xff;
+ tf->lbam = (block >> 8) & 0xff;
+ tf->lbal = block & 0xff;
- VPRINTK("sixteen-byte command\n");
- return 0;
+ tf->device |= ATA_LBA;
+ } else {
+ /* CHS */
+ u32 sect, head, cyl, track;
+
+ /* The request -may- be too large for CHS addressing. */
+ if ((block >> 28) || (n_block > 256))
+ return 1;
+
+ /* Convert LBA to CHS */
+ track = (u32)block / dev->sectors;
+ cyl = track / dev->heads;
+ head = track % dev->heads;
+ sect = (u32)block % dev->sectors + 1;
+
+ DPRINTK("block[%u] track[%u] cyl[%u] head[%u] sect[%u] \n",
+ (u32)block, track, cyl, head, sect);
+
+ /* Check whether the converted CHS can fit.
+ Cylinder: 0-65535
+ Head: 0-15
+ Sector: 1-255*/
+ if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
+ return 1;
+
+ qc->nsect = n_block;
+ tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
+ tf->lbal = sect;
+ tf->lbam = cyl;
+ tf->lbah = cyl >> 8;
+ tf->device |= head;
}
- DPRINTK("no-byte command\n");
- return 1;
+ return 0;
}
static int ata_scsi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
@@ -1167,10 +1231,20 @@ unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
VPRINTK("ENTER\n");
- if (ata_id_has_lba48(args->id))
- n_sectors = ata_id_u64(args->id, 100);
- else
- n_sectors = ata_id_u32(args->id, 60);
+ if (ata_id_has_lba(args->id)) {
+ if (ata_id_has_lba48(args->id))
+ n_sectors = ata_id_u64(args->id, 100);
+ else
+ n_sectors = ata_id_u32(args->id, 60);
+ } else {
+ /* CHS default translation */
+ n_sectors = args->id[1] * args->id[3] * args->id[6];
+
+ if (ata_id_current_chs_valid(args->id))
+ /* CHS current translation */
+ n_sectors = ata_id_u32(args->id, 57);
+ }
+
n_sectors--; /* ATA TotalUserSectors - 1 */
tmp = n_sectors; /* note: truncates, if lba48 */
diff --git a/include/linux/ata.h b/include/linux/ata.h
index f178894edd04..d8981402cd5b 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 505160ab472b..bd0df84cfd87 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 {
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-27 22:42:04 +0300