Messages in this thread Patch in this message | | | From | Mark Salter <> | Subject | [PATCH 2/3] define ARM-specific dma_coherent_write_sync | Date | Wed, 31 Aug 2011 17:30:13 -0400 |
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For ARM kernels using CONFIG_ARM_DMA_MEM_BUFFERABLE, this patch adds an ARM specific dma_coherent_write_sync() to override the default version. This routine forces out any data sitting in a write buffer between the CPU and memory.
Signed-off-by: Mark Salter <msalter@redhat.com> --- arch/arm/include/asm/dma-mapping.h | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 7a21d0b..e99562b 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -206,6 +206,16 @@ int dma_mmap_writecombine(struct device *, struct vm_area_struct *, void *, dma_addr_t, size_t); +#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE +#define ARCH_HAS_DMA_COHERENT_WRITE_SYNC + +static inline void dma_coherent_write_sync(void) +{ + dsb(); + outer_sync(); +} +#endif + #ifdef CONFIG_DMABOUNCE /* * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic" -- 1.7.6
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