Title: [6024] trunk/drivers/usb/musb: Introduce new MUSB_POLL_DMA option and new anomaly handling for BF527
- Revision
- 6024
- Author
- cooloney
- Date
- 2009-01-15 05:39:42 -0600 (Thu, 15 Jan 2009)
Log Message
Introduce new MUSB_POLL_DMA option and new anomaly handling for BF527
- MUSB_POLL_DMA option use DMA polling method to do FIFO read/write
when we usb PIO mode. Adding this because pure PIO mode is no very
stable during the USB testing
- Add ANOMALY_05000380 handling for BF527 (< 0.2 silicon)
Modified Paths
Diff
Modified: trunk/drivers/usb/musb/Kconfig (6023 => 6024)
--- trunk/drivers/usb/musb/Kconfig 2009-01-15 07:51:56 UTC (rev 6023)
+++ trunk/drivers/usb/musb/Kconfig 2009-01-15 11:39:42 UTC (rev 6024)
@@ -147,6 +147,14 @@
you can still disable it at run time using the "use_dma=n" module
parameter.
+config MUSB_DMA_POLL
+ bool 'Using DMA polling in MUSB PIO mode'
+ depends on MUSB_PIO_ONLY && BLACKFIN
+ default y if BLACKFIN
+ help
+ Using DMA busy loop polling to copy to/from FIFO. Because pure
+ PIO mode sometimes is also unstable in our testing.
+
config USB_INVENTRA_DMA
bool
depends on USB_MUSB_HDRC && !MUSB_PIO_ONLY
Modified: trunk/drivers/usb/musb/blackfin.c (6023 => 6024)
--- trunk/drivers/usb/musb/blackfin.c 2009-01-15 07:51:56 UTC (rev 6023)
+++ trunk/drivers/usb/musb/blackfin.c 2009-01-15 11:39:42 UTC (rev 6024)
@@ -30,6 +30,10 @@
{
void __iomem *fifo = hw_ep->fifo;
void __iomem *epio = hw_ep->regs;
+#if defined(CONFIG_MUSB_DMA_POLL) && (!ANOMALY_05000380)
+ u8 epnum = hw_ep->epnum;
+ u16 dma_reg = 0;
+#endif
prefetch((u8 *)src);
@@ -40,12 +44,48 @@
dump_fifo_data(src, len);
+#if defined(CONFIG_MUSB_DMA_POLL) && (!ANOMALY_05000380)
+ flush_dcache_range((unsigned int)src,
+ (unsigned int)(src + len));
+
+ /* Setup DMA address register */
+ dma_reg = (u16) ((u32) src & 0xFFFF);
+ bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
+ SSYNC();
+
+ dma_reg = (u16) (((u32) src >> 16) & 0xFFFF);
+ bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
+ SSYNC();
+
+ /* Setup DMA count register */
+ bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
+ bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
+ SSYNC();
+
+ /* Enable the DMA */
+ dma_reg = (epnum << 4) | DMA_ENA | INT_ENA | DIRECTION;
+ bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
+ SSYNC();
+
+ /* Wait for compelete */
+ while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
+ cpu_relax();
+
+ /* acknowledge dma interrupt */
+ bfin_write_USB_DMA_INTERRUPT(1 << epnum);
+ SSYNC();
+
+ /* Reset DMA */
+ bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
+ SSYNC();
+#else
if (unlikely((unsigned long)src & 0x01))
outsw_8((unsigned long)fifo, src,
len & 0x01 ? (len >> 1) + 1 : len >> 1);
else
outsw((unsigned long)fifo, src,
len & 0x01 ? (len >> 1) + 1 : len >> 1);
+#endif
}
/*
@@ -55,7 +95,7 @@
{
void __iomem *fifo = hw_ep->fifo;
-#ifdef CONFIG_BF52x
+#if defined(CONFIG_MUSB_DMA_POLL)
u8 epnum = hw_ep->epnum;
u16 dma_reg = 0;
Modified: trunk/drivers/usb/musb/blackfin.h (6023 => 6024)
--- trunk/drivers/usb/musb/blackfin.h 2009-01-15 07:51:56 UTC (rev 6023)
+++ trunk/drivers/usb/musb/blackfin.h 2009-01-15 11:39:42 UTC (rev 6024)
@@ -32,7 +32,7 @@
#define dump_fifo_data(buf, len) do {} while (0)
#endif
-#ifdef CONFIG_BF52x
+#if defined(CONFIG_MUSB_DMA_POLL)
#define USB_DMA_BASE USB_DMA_INTERRUPT
#define USB_DMAx_CTRL 0x04
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