[PATCH 2/3] define ARM-specific dma_coherent_write_sync

Mark Salter
2011-08-31T21:30:38Z

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