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m68k: Implement arch_dma_prep_coherent()

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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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Christoph Hellwig 2019-06-25 11:01:35 +02:00 committed by Geert Uytterhoeven
parent 34dc63a5fb
commit 69878ef475
2 changed files with 6 additions and 0 deletions
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1
arch/m68k/Kconfig
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@ -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

5
arch/m68k/kernel/dma.c
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@ -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)
{