From 4954a9a211f1863e3ca3958fd56ad06e1bddc22d Mon Sep 17 00:00:00 2001 From: Jayachandran C Date: Mon, 10 Jun 2013 06:28:08 +0000 Subject: [PATCH] MIPS: Support SWIOTLB in default dma operations Provide a default implementation of phys_to_dma and dma_to_phys in mach-generic/dma_coherence.h. If CONFIG_NEED_SG_DMA_LENGTH is defined, the dma_length field in struct scatterlist is used. Set this up in mips_dma_map_sg so that the default mips DMA ops can be used when SWIOTLB is enabled. Signed-off-by: Jayachandran C Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5409/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/mach-generic/dma-coherence.h | 12 ++++++++++++ arch/mips/mm/dma-default.c | 3 +++ 2 files changed, 15 insertions(+) diff --git a/arch/mips/include/asm/mach-generic/dma-coherence.h b/arch/mips/include/asm/mach-generic/dma-coherence.h index fe23034..74cb992 100644 --- a/arch/mips/include/asm/mach-generic/dma-coherence.h +++ b/arch/mips/include/asm/mach-generic/dma-coherence.h @@ -66,4 +66,16 @@ static inline int plat_device_is_coherent(struct device *dev) #endif } +#ifdef CONFIG_SWIOTLB +static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + return paddr; +} + +static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) +{ + return daddr; +} +#endif + #endif /* __ASM_MACH_GENERIC_DMA_COHERENCE_H */ diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index caf92ec..aaccf1c 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -246,6 +246,9 @@ static int mips_dma_map_sg(struct device *dev, struct scatterlist *sg, if (!plat_device_is_coherent(dev)) __dma_sync(sg_page(sg), sg->offset, sg->length, direction); +#ifdef CONFIG_NEED_SG_DMA_LENGTH + sg->dma_length = sg->length; +#endif sg->dma_address = plat_map_dma_mem_page(dev, sg_page(sg)) + sg->offset; } -- 2.7.4