diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2010-06-18 08:30:08 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2010-08-06 12:55:51 -0400 |
| commit | eb9649095f4e81a6535c10377da3d5f48b9ad822 (patch) | |
| tree | 9f95ef1ccaa4551d7a3794631562d1a4e6254682 /arch/blackfin | |
| parent | d1401e1dc22606a91f577ad3dfd68ae7e60e0357 (diff) | |
Blackfin: make sure mmiowb inserts a write barrier with SSYNC
Add SSYNC to our implementation of I/O write barrier to ensure ordering
of I/O space writes. This will make sure that writes following the
barrier will arrive after all previous writes.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/include/asm/io.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/blackfin/include/asm/io.h b/arch/blackfin/include/asm/io.h index 29e55b9d88b..234fbac17ec 100644 --- a/arch/blackfin/include/asm/io.h +++ b/arch/blackfin/include/asm/io.h @@ -124,7 +124,13 @@ static inline unsigned int readl(const volatile void __iomem *addr) #define iowrite16(val, x) writew(val, x) #define iowrite32(val, x) writel(val, x) -#define mmiowb() wmb() +/** + * I/O write barrier + * + * Ensure ordering of I/O space writes. This will make sure that writes + * following the barrier will arrive after all previous writes. + */ +#define mmiowb() do { SSYNC(); wmb(); } while (0) #define IO_SPACE_LIMIT 0xffffffff |