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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>
This commit is contained in:
Michael Hennerich 2010-06-18 08:30:08 +00:00 committed by Mike Frysinger
parent d1401e1dc2
commit eb9649095f
1 changed files with 7 additions and 1 deletions
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8
arch/blackfin/include/asm/io.h
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@ -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