From 69878ef47562f32e02d0b7975c990e1c0339320d Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 25 Jun 2019 11:01:35 +0200 Subject: 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 Signed-off-by: Geert Uytterhoeven --- arch/m68k/kernel/dma.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/m68k/kernel') 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 #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) { -- cgit v1.2.3