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 <jchandra@xxxxxxxxxxxx>
---
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;
}
--
1.7.9.5
