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| author | Christoph Hellwig <hch@lst.de> | 2019-06-25 11:01:35 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2019-07-01 11:17:00 +0200 |
| commit | 69878ef47562f32e02d0b7975c990e1c0339320d (patch) | |
| tree | 8a33017b7cacf7905dc0c2a85c6b64d283c51610 /arch/m68k/kernel | |
| parent | 34dc63a5fb9b7f5dcb49f61552226c6314f347f6 (diff) | |
| download | linux-69878ef47562f32e02d0b7975c990e1c0339320d.tar.gz linux-69878ef47562f32e02d0b7975c990e1c0339320d.tar.bz2 linux-69878ef47562f32e02d0b7975c990e1c0339320d.zip | |
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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/kernel')
| -rw-r--r-- | arch/m68k/kernel/dma.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c index e7bf355589e7..30cd59caf037 100644 --- a/arch/m68k/kernel/dma.c +++ b/arch/m68k/kernel/dma.c @@ -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) { |