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The GuruPlug's microSD card reader is a USB mass storage device that
has two logical units (LUNs), i.e., two "SCSI disks". This patch
adds multi-LUN support to the USB MSD driver.
See the thread at <http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/85425>.
--- u-boot/common/usb_storage.c 1970-01-01 01:00:01.000000000 +0100
+++ u-boot/common/usb_storage.c 2010-10-02 00:38:15.000000000 +0200
@@ -204,6 +204,22 @@ int usb_stor_info(void)
return 1;
}
+static unsigned int usb_get_max_lun(struct us_data *us)
+{
+ int len;
+ unsigned char result;
+ len = usb_control_msg(us->pusb_dev,
+ usb_rcvctrlpipe(us->pusb_dev, 0),
+ US_BBB_GET_MAX_LUN,
+ USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+ 0, us->ifnum,
+ &result, sizeof(result),
+ USB_CNTL_TIMEOUT * 5);
+ USB_STOR_PRINTF("Get Max LUN -> len = %i, result = %i\n",
+ len, (int) result);
+ return (len > 0) ? result : 0;
+}
+
/*******************************************************************************
* scan the usb and reports device info
* to the user if mode = 1
@@ -241,13 +257,21 @@ int usb_stor_scan(int mode)
break; /* no more devices avaiable */
if (usb_storage_probe(dev, 0, &usb_stor[usb_max_devs])) {
- /* ok, it is a storage devices
- * get info and fill it in
- */
- if (usb_stor_get_info(dev, &usb_stor[usb_max_devs],
- &usb_dev_desc[usb_max_devs]) == 1)
+ /* OK, it's a storage device. Iterate over its LUNs
+ * and populate `usb_dev_desc'. */
+ int lun, max_lun, start = usb_max_devs;
+
+ max_lun = usb_get_max_lun(&usb_stor[usb_max_devs]);
+ for (lun = 0;
+ lun <= max_lun && usb_max_devs < USB_MAX_STOR_DEV;
+ lun++) {
+ usb_dev_desc[usb_max_devs].lun = lun;
+ if (usb_stor_get_info(dev, &usb_stor[start],
+ &usb_dev_desc[usb_max_devs]) == 1) {
usb_max_devs++;
}
+ }
+ }
/* if storage device */
if (usb_max_devs == USB_MAX_STOR_DEV) {
printf("max USB Storage Device reached: %d stopping\n",
@@ -882,6 +906,7 @@ static int usb_inquiry(ccb *srb, struct
do {
memset(&srb->cmd[0], 0, 12);
srb->cmd[0] = SCSI_INQUIRY;
+ srb->cmd[1] = srb->lun << 5;
srb->cmd[4] = 36;
srb->datalen = 36;
srb->cmdlen = 12;
@@ -905,6 +930,7 @@ static int usb_request_sense(ccb *srb, s
ptr = (char *)srb->pdata;
memset(&srb->cmd[0], 0, 12);
srb->cmd[0] = SCSI_REQ_SENSE;
+ srb->cmd[1] = srb->lun << 5;
srb->cmd[4] = 18;
srb->datalen = 18;
srb->pdata = &srb->sense_buf[0];
@@ -924,6 +950,7 @@ static int usb_test_unit_ready(ccb *srb,
do {
memset(&srb->cmd[0], 0, 12);
srb->cmd[0] = SCSI_TST_U_RDY;
+ srb->cmd[1] = srb->lun << 5;
srb->datalen = 0;
srb->cmdlen = 12;
if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD)
@@ -943,6 +970,7 @@ static int usb_read_capacity(ccb *srb, s
do {
memset(&srb->cmd[0], 0, 12);
srb->cmd[0] = SCSI_RD_CAPAC;
+ srb->cmd[1] = srb->lun << 5;
srb->datalen = 8;
srb->cmdlen = 12;
if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD)
@@ -957,6 +985,7 @@ static int usb_read_10(ccb *srb, struct
{
memset(&srb->cmd[0], 0, 12);
srb->cmd[0] = SCSI_READ10;
+ srb->cmd[1] = srb->lun << 5;
srb->cmd[2] = ((unsigned char) (start >> 24)) & 0xff;
srb->cmd[3] = ((unsigned char) (start >> 16)) & 0xff;
srb->cmd[4] = ((unsigned char) (start >> 8)) & 0xff;
@@ -973,6 +1002,7 @@ static int usb_write_10(ccb *srb, struct
{
memset(&srb->cmd[0], 0, 12);
srb->cmd[0] = SCSI_WRITE10;
+ srb->cmd[1] = srb->lun << 5;
srb->cmd[2] = ((unsigned char) (start >> 24)) & 0xff;
srb->cmd[3] = ((unsigned char) (start >> 16)) & 0xff;
srb->cmd[4] = ((unsigned char) (start >> 8)) & 0xff;
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