Blackfin arch: add mmiowb() as some drivers expect

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/blackfin/include/asm/io.h b/arch/blackfin/include/asm/io.h
index 7dc77a21fdf3..e7591ea2a0e0 100644
--- a/arch/blackfin/include/asm/io.h
+++ b/arch/blackfin/include/asm/io.h
@@ -108,6 +108,8 @@ 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()
+
 #define IO_SPACE_LIMIT 0xffffffff
 
 /* Values for nocacheflag and cmode */