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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 | |
| parent | 34dc63a5fb9b7f5dcb49f61552226c6314f347f6 (diff) | |
| download | linux-cip-69878ef47562f32e02d0b7975c990e1c0339320d.tar.gz | |
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>
| -rw-r--r-- | arch/m68k/Kconfig | 1 | ||||
| -rw-r--r-- | arch/m68k/kernel/dma.c | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 3a52bf46e0433f..00f5c98a5e05d7 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -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 diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c index e7bf355589e780..30cd59caf037ee 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) { |