diff options
| -rw-r--r-- | common/usb_storage.c | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/common/usb_storage.c b/common/usb_storage.c index 0cd6399..099edd3 100644 --- a/common/usb_storage.c +++ b/common/usb_storage.c @@ -157,12 +157,13 @@ struct us_data { #ifdef CONFIG_USB_EHCI /* - * The U-Boot EHCI driver cannot handle more than 5 page aligned buffers - * of 4096 bytes in a transfer without running itself out of qt_buffers + * The U-Boot EHCI driver can handle any transfer length as long as there is + * enough free heap space left, but the SCSI READ(10) and WRITE(10) commands are + * limited to 65535 blocks. */ -#define USB_MAX_XFER_BLK(start, blksz) (((4096 * 5) - (start % 4096)) / blksz) +#define USB_MAX_XFER_BLK 65535 #else -#define USB_MAX_XFER_BLK(start, blksz) 20 +#define USB_MAX_XFER_BLK 20 #endif static struct us_data usb_stor[USB_MAX_STOR_DEV]; @@ -1050,7 +1051,7 @@ static void usb_bin_fixup(struct usb_device_descriptor descriptor, unsigned long usb_stor_read(int device, unsigned long blknr, unsigned long blkcnt, void *buffer) { - unsigned long start, blks, buf_addr, max_xfer_blk; + unsigned long start, blks, buf_addr; unsigned short smallblks; struct usb_device *dev; struct us_data *ss; @@ -1092,14 +1093,12 @@ unsigned long usb_stor_read(int device, unsigned long blknr, /* XXX need some comment here */ retry = 2; srb->pdata = (unsigned char *)buf_addr; - max_xfer_blk = USB_MAX_XFER_BLK(buf_addr, - usb_dev_desc[device].blksz); - if (blks > max_xfer_blk) - smallblks = (unsigned short) max_xfer_blk; + if (blks > USB_MAX_XFER_BLK) + smallblks = USB_MAX_XFER_BLK; else smallblks = (unsigned short) blks; retry_it: - if (smallblks == max_xfer_blk) + if (smallblks == USB_MAX_XFER_BLK) usb_show_progress(); srb->datalen = usb_dev_desc[device].blksz * smallblks; srb->pdata = (unsigned char *)buf_addr; @@ -1120,7 +1119,7 @@ retry_it: start, smallblks, buf_addr); usb_disable_asynch(0); /* asynch transfer allowed */ - if (blkcnt >= max_xfer_blk) + if (blkcnt >= USB_MAX_XFER_BLK) debug("\n"); return blkcnt; } @@ -1128,7 +1127,7 @@ retry_it: unsigned long usb_stor_write(int device, unsigned long blknr, unsigned long blkcnt, const void *buffer) { - unsigned long start, blks, buf_addr, max_xfer_blk; + unsigned long start, blks, buf_addr; unsigned short smallblks; struct usb_device *dev; struct us_data *ss; @@ -1173,14 +1172,12 @@ unsigned long usb_stor_write(int device, unsigned long blknr, */ retry = 2; srb->pdata = (unsigned char *)buf_addr; - max_xfer_blk = USB_MAX_XFER_BLK(buf_addr, - usb_dev_desc[device].blksz); - if (blks > max_xfer_blk) - smallblks = (unsigned short) max_xfer_blk; + if (blks > USB_MAX_XFER_BLK) + smallblks = USB_MAX_XFER_BLK; else smallblks = (unsigned short) blks; retry_it: - if (smallblks == max_xfer_blk) + if (smallblks == USB_MAX_XFER_BLK) usb_show_progress(); srb->datalen = usb_dev_desc[device].blksz * smallblks; srb->pdata = (unsigned char *)buf_addr; @@ -1201,7 +1198,7 @@ retry_it: start, smallblks, buf_addr); usb_disable_asynch(0); /* asynch transfer allowed */ - if (blkcnt >= max_xfer_blk) + if (blkcnt >= USB_MAX_XFER_BLK) debug("\n"); return blkcnt; |