Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...

[mv-sheeva.git] / drivers / usb / musb / blackfin.h

diff --git a/drivers/usb/musb/blackfin.h b/drivers/usb/musb/blackfin.h
index a240c1e53d16e16bf3acf214b2847b79d8643965..bd9352a2ef2a0b89f867121f998a9d3ef486bbed 100644 (file)
--- a/drivers/usb/musb/blackfin.h
+++ b/drivers/usb/musb/blackfin.h
@@ -14,6 +14,43 @@
  * Blackfin specific definitions
  */
 
+/* Anomalies notes:
+ *
+ *  05000450 - USB DMA Mode 1 Short Packet Data Corruption:
+ *             MUSB driver is designed to transfer buffer of N * maxpacket size
+ *             in DMA mode 1 and leave the rest of the data to the next
+ *             transfer in DMA mode 0, so we never transmit a short packet in
+ *             DMA mode 1.
+ *
+ *  05000463 - This anomaly doesn't affect this driver since it
+ *             never uses L1 or L2 memory as data destination.
+ *
+ *  05000464 - This anomaly doesn't affect this driver since it
+ *             never uses L1 or L2 memory as data source.
+ *
+ *  05000465 - The anomaly can be seen when SCLK is over 100 MHz, and there is
+ *             no way to workaround for bulk endpoints.  Since the wMaxPackSize
+ *             of bulk is less than or equal to 512, while the fifo size of
+ *             endpoint 5, 6, 7 is 1024, the double buffer mode is enabled
+ *             automatically when these endpoints are used for bulk OUT.
+ *
+ *  05000466 - This anomaly doesn't affect this driver since it never mixes
+ *             concurrent DMA and core accesses to the TX endpoint FIFOs.
+ *
+ *  05000467 - The workaround for this anomaly will introduce another
+ *             anomaly - 05000465.
+ */
+
+/* The Mentor USB DMA engine on BF52x (silicon v0.0 and v0.1) seems to be
+ * unstable in host mode.  This may be caused by Anomaly 05000380.  After
+ * digging out the root cause, we will change this number accordingly.
+ * So, need to either use silicon v0.2+ or disable DMA mode in MUSB.
+ */
+#if ANOMALY_05000380 && defined(CONFIG_BF52x) && \
+    defined(CONFIG_USB_MUSB_HDRC) && !defined(CONFIG_MUSB_PIO_ONLY)
+# error "Please use PIO mode in MUSB driver on bf52x chip v0.0 and v0.1"
+#endif
+
 #undef DUMP_FIFO_DATA
 #ifdef DUMP_FIFO_DATA
 static void dump_fifo_data(u8 *buf, u16 len)
@@ -32,7 +69,6 @@ static void dump_fifo_data(u8 *buf, u16 len)
 #define dump_fifo_data(buf, len)       do {} while (0)
 #endif
 
-#ifdef CONFIG_BF52x
 
 #define USB_DMA_BASE           USB_DMA_INTERRUPT
 #define USB_DMAx_CTRL          0x04
@@ -42,7 +78,6 @@ static void dump_fifo_data(u8 *buf, u16 len)
 #define USB_DMAx_COUNT_HIGH    0x14
 
 #define USB_DMA_REG(ep, reg)   (USB_DMA_BASE + 0x20 * ep + reg)
-#endif
 
 /* Almost 1 second */
 #define TIMER_DELAY    (1 * HZ)