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>

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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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arch/m68k/Kconfig

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5

arch/m68k/kernel/dma.c

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