Attach is a patch that adds translation of scsi WRITE_BUFFER to ATA_DOWNLOAD_MICROCODE command. This patch enables firmware flashing of sata drives that are registered as scsi devices under linux; hence scsi to ata translation is needed. This patch provides the translation.
Imran Salim
Hewlett Pacakrd Company
Houston, TX
(281) 514-1531
diff -burp linux-2.6.16.60-0.21/drivers/ata/libata-scsi.c linux-2.6.16.60-0.21.ver1.[coderefactor]/drivers/ata/libata-scsi.c
--- linux-2.6.16.60-0.21/drivers/ata/libata-scsi.c 2009-03-06 07:45:22.000000000 -0500
+++ linux-2.6.16.60-0.21.ver1.[coderefactor]/drivers/ata/libata-scsi.c 2009-03-09 08:15:36.000000000 -0400
@@ -1417,6 +1417,78 @@ nothing_to_do:
return 1;
}
+/*
+ * ata_scsi_write_buffer_xlat - Translates SCSI 'Write Buffer' command
+ * into ATA equivalent 'Download Microcode' command. This function is
+ * implemented according to following spec.
+ * Working Draft American National Standard Information Technology
+ * SCSI/ATA Translation-2 (SAT-2)
+ * T10/1826-D Rev 5 Date: June 22, 2008
+ * @qc: Storage for translated ATA taskfile
+ *
+ * RETURNS:
+ * Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_write_buffer_xlat(struct ata_queued_cmd *qc)
+{
+ /* scsi */
+ int mode = 0;
+ int buff_id = 0;
+ int buff_offset = 0;
+ int parm_list_len = 0;
+
+ /* ata */
+ int n_sect = 0;
+
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ const u8 *cdb = scmd->cmnd;
+ struct ata_taskfile *tf = &qc->tf;
+
+ mode = cdb[1] & 0x07; /* First 3 bits 0x07=00000111 */
+ buff_id = cdb[2];
+
+ buff_offset |= cdb[3] << 24;
+ buff_offset |= cdb[4] << 16;
+ buff_offset |= cdb[5];
+
+ parm_list_len |= cdb[6] << 16;
+ parm_list_len |= cdb[7] << 8;
+ parm_list_len |= cdb[8];
+
+ n_sect = parm_list_len / ATA_SECT_SIZE;
+ qc->nsect = n_sect;
+
+ tf->nsect = n_sect & 0xff;
+ tf->lbal = (n_sect >> 8) & 0xff;
+ tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_WRITE;
+
+ switch (mode) {
+ case 0x02:
+ if (buff_id == 0 && buff_offset == 0 && parm_list_len == 512) {
+ tf->command = ATA_CMD_WRITE_BUFFER;
+ tf->protocol = ATA_PROT_PIO;
+ } else {
+ ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ }
+ break;
+ case 0x05:
+ tf->command = ATA_CMD_DOWNLOAD_MICROCODE;
+ tf->protocol = ATA_PROT_PIO;
+ tf->feature = 7;
+ break;
+ case 0x07:
+ tf->command = ATA_CMD_DOWNLOAD_MICROCODE;
+ tf->protocol = ATA_PROT_PIO;
+ tf->feature = 3;
+ break;
+ default:
+ ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ return 1;
+ }
+
+ return 0;
+}
+
static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
@@ -2730,6 +2802,9 @@ static inline ata_xlat_func_t ata_get_xl
case WRITE_16:
return ata_scsi_rw_xlat;
+ case WRITE_BUFFER:
+ return ata_scsi_write_buffer_xlat;
+
case SYNCHRONIZE_CACHE:
if (ata_try_flush_cache(dev))
return ata_scsi_flush_xlat;
diff -burp linux-2.6.16.60-0.21/include/linux/ata.h linux-2.6.16.60-0.21.ver1.[coderefactor]/include/linux/ata.h
--- linux-2.6.16.60-0.21/include/linux/ata.h 2009-03-06 07:45:53.000000000 -0500
+++ linux-2.6.16.60-0.21.ver1.[coderefactor]/include/linux/ata.h 2009-03-06 06:29:44.000000000 -0500
@@ -130,6 +130,7 @@ enum {
ATA_CMD_STANDBY = 0xE2, /* place in standby power mode */
ATA_CMD_IDLE = 0xE3, /* place in idle power mode */
ATA_CMD_EDD = 0x90, /* execute device diagnostic */
+ ATA_CMD_DOWNLOAD_MICROCODE = 0x92,
ATA_CMD_FLUSH = 0xE7,
ATA_CMD_FLUSH_EXT = 0xEA,
ATA_CMD_ID_ATA = 0xEC,
@@ -150,6 +151,7 @@ enum {
ATA_CMD_WRITE_MULTI = 0xC5,
ATA_CMD_WRITE_MULTI_EXT = 0x39,
ATA_CMD_WRITE_MULTI_FUA_EXT = 0xCE,
+ ATA_CMD_WRITE_BUFFER = 0xE8,
ATA_CMD_SET_FEATURES = 0xEF,
ATA_CMD_PACKET = 0xA0,
ATA_CMD_VERIFY = 0x40,
Signed-off-by: Imran Salim <imran.salim@xxxxxx>
