提交 4954a9a2 编写于 作者: J Jayachandran C 提交者: Ralf Baechle

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: NJayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5409/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
上级 0cecddec
......@@ -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 */
......@@ -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;
}
......
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