From 69878ef47562f32e02d0b7975c990e1c0339320d Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 25 Jun 2019 11:01:35 +0200 Subject: [PATCH] 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/Kconfig | 1 + arch/m68k/kernel/dma.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 3a52bf4..00f5c98 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 e7bf355..30cd59c 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) { -- 2.7.4