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Commit eb964909 authored by Michael Hennerich's avatar Michael Hennerich Committed by Mike Frysinger
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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: default avatarMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent d1401e1d

arch/blackfin/include/asm/io.h

+7 −1
Original line number Diff line number Diff line
@@ -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