diff options
| author | Tom Rini <trini@ti.com> | 2012-07-15 22:14:24 +0000 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2012-07-18 14:43:29 +0200 |
| commit | 71c5de4f4af5e0995f89dffa79f48f26bd095f50 (patch) | |
| tree | 404ca9d37ccb271ccaf370e5eff5807c34bd90be /include/usb.h | |
| parent | c7701af59f011e39f52647620a71cc6f2f551d2d (diff) | |
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.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/usb.h b/include/usb.h index 6da91e7232e..ba3d169ea8c 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 */ |