From 9d86b89c590832c9bcb1c69d5ccdecdf731f97ae Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Fri, 14 Feb 2020 16:40:19 +0900 Subject: dma-mapping: move dma_map_(un)single() to The implementation of dma_map_single() and dma_unmap_single() is exactly the same for all the architectures that support them. Factor them out to , and make all drivers to include instead of . If we need to differentiate them for some architectures, we can move the generic definitions to . Add some comments to the helpers. The concept is quite similar to the DMA-API of Linux kernel. Drivers are agnostic about what is going on behind the scene. Just call dma_map_single() before the DMA, and dma_unmap_single() after it. Signed-off-by: Masahiro Yamada --- arch/nds32/include/asm/dma-mapping.h | 24 ------------------------ 1 file changed, 24 deletions(-) (limited to 'arch/nds32') diff --git a/arch/nds32/include/asm/dma-mapping.h b/arch/nds32/include/asm/dma-mapping.h index 784f489..f8668f1 100644 --- a/arch/nds32/include/asm/dma-mapping.h +++ b/arch/nds32/include/asm/dma-mapping.h @@ -19,28 +19,4 @@ static void *dma_alloc_coherent(size_t len, unsigned long *handle) return (void *)*handle; } -static inline dma_addr_t dma_map_single(void *vaddr, size_t len, - enum dma_data_direction dir) -{ - unsigned long addr = (unsigned long)vaddr; - - len = ALIGN(len, ARCH_DMA_MINALIGN); - - if (dir == DMA_FROM_DEVICE) - invalidate_dcache_range(addr, addr + len); - else - flush_dcache_range(addr, addr + len); - - return addr; -} - -static inline void dma_unmap_single(dma_addr_t addr, size_t len, - enum dma_data_direction dir) -{ - len = ALIGN(len, ARCH_DMA_MINALIGN); - - if (dir != DMA_TO_DEVICE) - invalidate_dcache_range(addr, addr + len); -} - #endif /* __ASM_NDS_DMA_MAPPING_H */ -- cgit v1.1