From mboxrd@z Thu Jan 1 00:00:00 1970 From: msalter@redhat.com (Mark Salter) Date: Wed, 31 Aug 2011 17:30:13 -0400 Subject: [PATCH 2/3] define ARM-specific dma_coherent_write_sync In-Reply-To: <1314826214-22428-1-git-send-email-msalter@redhat.com> References: <1314826214-22428-1-git-send-email-msalter@redhat.com> Message-ID: <1314826214-22428-3-git-send-email-msalter@redhat.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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