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Commit 69878ef4 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Geert Uytterhoeven
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m68k: Implement arch_dma_prep_coherent() 



When we remap memory as non-cached, to be used as a DMA coherent buffer,
we should writeback all cache and invalidate the cache lines so that we
make sure we have a clean slate.  Implement this using the cache_push()
helper.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
parent 34dc63a5

arch/m68k/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ config M68K 
	default y

	select ARCH_32BIT_OFF_T

	select ARCH_HAS_DMA_MMAP_PGPROT if MMU && !COLDFIRE

	select ARCH_HAS_DMA_PREP_COHERENT

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA

	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA

	select ARCH_NO_COHERENT_DMA_MMAP if !MMU

arch/m68k/kernel/dma.c

+5 −0
Original line number Diff line number Diff line
@@ -18,6 +18,11 @@ 
#include <asm/pgalloc.h>



#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)

void arch_dma_prep_coherent(struct page *page, size_t size)

{

	cache_push(page_to_phys(page), size);

}



pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,

		unsigned long attrs)

{