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

1 files changed, 115 insertions, 25 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;