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authorBenoît Thébaudeau <benoit.thebaudeau@advansee.com>2012-08-10 18:23:25 +0200
committerMarek Vasut <marex@denx.de>2012-09-01 16:21:52 +0200
commit4bee5c83ea46b5c7a5670f7decd6ba2515483d9c (patch)
treef0489678b5decc4aac48c7ea6fd20d4564fd97fa /common/usb_storage.c
parentcffcc503580907d733e694d505e12ff6ec6c679a (diff)
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usb_storage: Remove EHCI constraints
Now that the EHCI driver allocates its qTDs from the heap, the MSC driver is only limited by the SCSI commands it uses. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com> Cc: Marek Vasut <marex@denx.de> Cc: Ilya Yanok <ilya.yanok@cogentembedded.com> Cc: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
Diffstat (limited to 'common/usb_storage.c')
-rw-r--r--common/usb_storage.c33
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;