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MIPS: Add option to disable software I/O coherency.

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Some MIPS controllers have hardware I/O coherency. This patch
detects those and turns off software coherency. A new kernel
command line option also allows the user to manually turn
software coherency on or off.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
This commit is contained in:
Steven J. Hill
2013-03-25 13:47:29 -05:00
parent c34c09c81d
commit b6d92b4a6b
7 changed files with 112 additions and 24 deletions
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arch/mips/include/asm/dma-mapping.h
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@@ -2,6 +2,7 @@
#define _ASM_DMA_MAPPING_H
#include <asm/scatterlist.h>
#include <asm/dma-coherence.h>
#include <asm/cache.h>
#include <asm-generic/dma-coherent.h>