[U-Boot] [PATCH v4 4/7] usb_storage: Remove EHCI constraints

Benoît Thébaudeau
2012-08-10T16:23:25Z

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: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Ilya Yanok <ilya.yanok@cogentembedded.com>
Cc: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
---
Changes for v2: None.
Changes for v3:
- Patch swapped with the currently preceding one.
Changes for v4: None.

.../common/usb_storage.c | 33 +++++++++-----------
1 file changed, 15 insertions(+), 18 deletions(-)

diff --git u-boot-usb-4f8254e.orig/common/usb_storage.c u-boot-usb-4f8254e/common/usb_storage.c
index 0cd6399..822bd64 100644
--- u-boot-usb-4f8254e.orig/common/usb_storage.c
+++ u-boot-usb-4f8254e/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 bytes.
*/
-#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;