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Commit 6d6ef30e authored by Arve Hjønnevåg's avatar Arve Hjønnevåg Committed by Dmitry Shmidt
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ANDROID: Optionally flush entire dcache from v6_dma_flush_range 



If CACHE_FLUSH_RANGE_LIMIT is defined, then the entire dcache will
be flushed if the requested range is larger than this limit.

Change-Id: I29277d645a9d6716b1952cf3b870c78496261dd0
Signed-off-by: default avatarArve Hjønnevåg <arve@android.com>
parent c6023aa6

arch/arm/mm/cache-v6.S

+17 −0
Original line number Diff line number Diff line
@@ -270,6 +270,11 @@ v6_dma_clean_range: 
 *	- end     - virtual end address of region

 */

ENTRY(v6_dma_flush_range)

#ifdef CONFIG_CACHE_FLUSH_RANGE_LIMIT

	sub	r2, r1, r0

	cmp	r2, #CONFIG_CACHE_FLUSH_RANGE_LIMIT

	bhi	v6_dma_flush_dcache_all

#endif

#ifdef CONFIG_DMA_CACHE_RWFO

	ldrb	r2, [r0]		@ read for ownership

	strb	r2, [r0]		@ write for ownership
@@ -292,6 +297,18 @@ ENTRY(v6_dma_flush_range) 
	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer

	ret	lr



#ifdef CONFIG_CACHE_FLUSH_RANGE_LIMIT

v6_dma_flush_dcache_all:

	mov	r0, #0

#ifdef HARVARD_CACHE

	mcr	p15, 0, r0, c7, c14, 0		@ D cache clean+invalidate

#else

	mcr	p15, 0, r0, c7, c15, 0		@ Cache clean+invalidate

#endif

	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer

	mov	pc, lr

#endif



/*

 *	dma_map_area(start, size, dir)

 *	- start	- kernel virtual start address