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authorTom Rini <trini@ti.com>2012-07-15 22:14:24 +0000
committerMarek Vasut <marex@denx.de>2012-07-18 14:43:29 +0200
commit71c5de4f4af5e0995f89dffa79f48f26bd095f50 (patch)
tree404ca9d37ccb271ccaf370e5eff5807c34bd90be /include/usb.h
parentc7701af59f011e39f52647620a71cc6f2f551d2d (diff)
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ehci-hcd.c, musb_core, usb.h: Add USB_DMA_MINALIGN define for cache alignment
The USB spec says that 32 bytes is the minimum required alignment. However on some platforms we have a larger minimum requirement for cache coherency. In those cases, use that value rather than the USB spec minimum. We add a cpp check to <usb.h> to define USB_DMA_MINALIGN and make use of it in ehci-hcd.c and musb_core.h. We cannot use MAX() here as we are not allowed to have tests inside of align(...). Signed-off-by: Tom Rini <trini@ti.com> [marek.vasut]: introduce some crazy macro voodoo Signed-off-by: Marek Vasut <marex@denx.de> [ilya.yanok]: moved external buffer fixes to separate patch, we use {ALLOC,DEFINE}_ALIGN_BUFFER macros with alignment of USB_DMA_MINALIGN for qh_list, qh and qtd structures to make sure they are proper aligned for both controller and cache operations. Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>
Diffstat (limited to 'include/usb.h')
-rw-r--r--include/usb.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/usb.h b/include/usb.h
index 6da91e7..ba3d169 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -29,6 +29,16 @@
#include <usb_defs.h>
#include <usbdescriptors.h>
+/*
+ * The EHCI spec says that we must align to at least 32 bytes. However,
+ * some platforms require larger alignment.
+ */
+#if ARCH_DMA_MINALIGN > 32
+#define USB_DMA_MINALIGN ARCH_DMA_MINALIGN
+#else
+#define USB_DMA_MINALIGN 32
+#endif
+
/* Everything is aribtrary */
#define USB_ALTSETTINGALLOC 4
#define USB_MAXALTSETTING 128 /* Hard limit */