diff options
| author | Marek Vasut <marex@denx.de> | 2013-07-10 03:16:38 +0200 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2013-07-29 23:01:32 +0200 |
| commit | 5804b8859a3317d3deb1e6adafc2a2604d276f1c (patch) | |
| tree | 88dc1ce03060652e26a5cbc4cd527049bdd2882d /drivers/usb | |
| parent | ab65da1446d8ba423514c2236291962adf2bd2a6 (diff) | |
usb: mv_udc: Add cacheline length check
Check the length of system cacheline at compile-time and fail
if the system uses too long cachelines.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Lei Wen <leiwen@marvell.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/mv_udc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/gadget/mv_udc.c b/drivers/usb/gadget/mv_udc.c index bbf4418a2e..1ead2f2459 100644 --- a/drivers/usb/gadget/mv_udc.c +++ b/drivers/usb/gadget/mv_udc.c @@ -21,6 +21,16 @@ #error This driver only supports one single controller. #endif +/* + * Check if the system has too long cachelines. If the cachelines are + * longer then 128b, the driver will not be able flush/invalidate data + * cache over separate QH entries. We use 128b because one QH entry is + * 64b long and there are always two QH list entries for each endpoint. + */ +#if ARCH_DMA_MINALIGN > 128 +#error This driver can not work on systems with caches longer than 128b +#endif + #ifndef DEBUG #define DBG(x...) do {} while (0) #else |