When performing large bulk reads from a CD or DVD using the U-Boot usb_storage driver, it generates requests of up to 20 blocks at a time.
With a standard 512-byte block size, that is 10240 bytes and within the limit of U-Boot's EHCI driver (maximum 5 pages at 4k per page).
Unfortunately CD-ROM media has a 2048-byte blocksize, resulting in a maximum transfer size of 40960 bytes, which does not fit.
Since the EHCI specification is impossibly obtuse and far beyond my comprehension, I chose to dynamically compute the limit based on the blocksize.
Signed-off-by: Kyle Moffett Kyle.D.Moffett@boeing.com
--
v2: Minor whitespace fixes
--- common/usb_storage.c | 45 +++++++++++++++++++++++++-------------------- 1 files changed, 25 insertions(+), 20 deletions(-)
diff --git a/common/usb_storage.c b/common/usb_storage.c index d9a2585..de84c8d 100644 --- a/common/usb_storage.c +++ b/common/usb_storage.c @@ -151,6 +151,7 @@ struct us_data { unsigned int irqpipe; /* pipe for release_irq */ unsigned char irqmaxp; /* max packed for irq Pipe */ unsigned char irqinterval; /* Intervall for IRQ Pipe */ + unsigned long max_xfer_blk; /* Max blocks per xfer */ ccb *srb; /* current srb */ trans_reset transport_reset; /* reset routine */ trans_cmnd transport; /* transport routine */ @@ -1041,14 +1042,13 @@ static void usb_bin_fixup(struct usb_device_descriptor descriptor, } #endif /* CONFIG_USB_BIN_FIXUP */
-#define USB_MAX_READ_BLK 20 - unsigned long usb_stor_read(int device, unsigned long blknr, unsigned long blkcnt, void *buffer) { unsigned long start, blks, buf_addr; unsigned short smallblks; struct usb_device *dev; + struct us_data *ss; int retry, i; ccb *srb = &usb_ccb;
@@ -1066,13 +1066,14 @@ unsigned long usb_stor_read(int device, unsigned long blknr, if (dev->devnum == usb_dev_desc[device].target) break; } + ss = (struct us_data *)dev->privptr;
usb_disable_asynch(1); /* asynch transfer not allowed */ srb->lun = usb_dev_desc[device].lun; buf_addr = (unsigned long)buffer; start = blknr; blks = blkcnt; - if (usb_test_unit_ready(srb, (struct us_data *)dev->privptr)) { + if (usb_test_unit_ready(srb, ss)) { printf("Device NOT ready\n Request Sense returned %02X %02X" " %02X\n", srb->sense_buf[2], srb->sense_buf[12], srb->sense_buf[13]); @@ -1086,19 +1087,18 @@ unsigned long usb_stor_read(int device, unsigned long blknr, /* XXX need some comment here */ retry = 2; srb->pdata = (unsigned char *)buf_addr; - if (blks > USB_MAX_READ_BLK) - smallblks = USB_MAX_READ_BLK; + if (blks > ss->max_xfer_blk) + smallblks = ss->max_xfer_blk; else smallblks = (unsigned short) blks; retry_it: - if (smallblks == USB_MAX_READ_BLK) + if (smallblks == ss->max_xfer_blk) usb_show_progress(); srb->datalen = usb_dev_desc[device].blksz * smallblks; srb->pdata = (unsigned char *)buf_addr; - if (usb_read_10(srb, (struct us_data *)dev->privptr, start, - smallblks)) { + if (usb_read_10(srb, ss, start, smallblks)) { USB_STOR_PRINTF("Read ERROR\n"); - usb_request_sense(srb, (struct us_data *)dev->privptr); + usb_request_sense(srb, ss); if (retry--) goto retry_it; blkcnt -= blks; @@ -1113,19 +1113,18 @@ retry_it: start, smallblks, buf_addr);
usb_disable_asynch(0); /* asynch transfer allowed */ - if (blkcnt >= USB_MAX_READ_BLK) + if (blkcnt >= ss->max_xfer_blk) debug("\n"); return blkcnt; }
-#define USB_MAX_WRITE_BLK 20 - unsigned long usb_stor_write(int device, unsigned long blknr, unsigned long blkcnt, const void *buffer) { unsigned long start, blks, buf_addr; unsigned short smallblks; struct usb_device *dev; + struct us_data *ss; int retry, i; ccb *srb = &usb_ccb;
@@ -1143,6 +1142,7 @@ unsigned long usb_stor_write(int device, unsigned long blknr, if (dev->devnum == usb_dev_desc[device].target) break; } + ss = (struct us_data *)dev->privptr;
usb_disable_asynch(1); /* asynch transfer not allowed */
@@ -1150,7 +1150,7 @@ unsigned long usb_stor_write(int device, unsigned long blknr, buf_addr = (unsigned long)buffer; start = blknr; blks = blkcnt; - if (usb_test_unit_ready(srb, (struct us_data *)dev->privptr)) { + if (usb_test_unit_ready(srb, ss)) { printf("Device NOT ready\n Request Sense returned %02X %02X" " %02X\n", srb->sense_buf[2], srb->sense_buf[12], srb->sense_buf[13]); @@ -1166,19 +1166,18 @@ unsigned long usb_stor_write(int device, unsigned long blknr, */ retry = 2; srb->pdata = (unsigned char *)buf_addr; - if (blks > USB_MAX_WRITE_BLK) - smallblks = USB_MAX_WRITE_BLK; + if (blks > ss->max_xfer_blk) + smallblks = ss->max_xfer_blk; else smallblks = (unsigned short) blks; retry_it: - if (smallblks == USB_MAX_WRITE_BLK) + if (smallblks == ss->max_xfer_blk) usb_show_progress(); srb->datalen = usb_dev_desc[device].blksz * smallblks; srb->pdata = (unsigned char *)buf_addr; - if (usb_write_10(srb, (struct us_data *)dev->privptr, start, - smallblks)) { + if (usb_write_10(srb, ss, start, smallblks)) { USB_STOR_PRINTF("Write ERROR\n"); - usb_request_sense(srb, (struct us_data *)dev->privptr); + usb_request_sense(srb, ss); if (retry--) goto retry_it; blkcnt -= blks; @@ -1193,7 +1192,7 @@ retry_it: start, smallblks, buf_addr);
usb_disable_asynch(0); /* asynch transfer allowed */ - if (blkcnt >= USB_MAX_WRITE_BLK) + if (blkcnt >= ss->max_xfer_blk) debug("\n"); return blkcnt;
@@ -1419,6 +1418,12 @@ int usb_stor_get_info(struct usb_device *dev, struct us_data *ss, USB_STOR_PRINTF(" address %d\n", dev_desc->target); USB_STOR_PRINTF("partype: %d\n", dev_desc->part_type);
+ /* + * The U-Boot EHCI driver cannot handle more than 4096 * 5 bytes in a + * transfer without running itself out of qt_buffers. + */ + ss->max_xfer_blk = (4096 * 5) / dev_desc->blksz; + init_part(dev_desc);
USB_STOR_PRINTF("partype: %d\n", dev_desc->part_type);