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

1 files changed, 177 insertions, 103 deletions

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 */