diff options
Diffstat (limited to 'arch/arc/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/arc/include/asm/dma-mapping.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h index 7fd150e..31f77ae 100644 --- a/arch/arc/include/asm/dma-mapping.h +++ b/arch/arc/include/asm/dma-mapping.h @@ -13,7 +13,23 @@ #include <asm-generic/dma-coherent.h> #include <asm/cacheflush.h> + +#ifndef CONFIG_ARC_PLAT_NEEDS_CPU_TO_DMA +/* + * dma_map_* API take cpu addresses, which is kernel logical address in the + * untranslated address space (0x8000_0000) based. The dma address (bus addr) + * ideally needs to be 0x0000_0000 based hence these glue routines. + * However given that intermediate bus bridges can ignore the high bit, we can + * do with these routines being no-ops. + * If a platform/device comes up which sriclty requires 0 based bus addr + * (e.g. AHB-PCI bridge on Angel4 board), then it can provide it's own versions + */ +#define plat_dma_addr_to_kernel(dev, addr) ((unsigned long)(addr)) +#define plat_kernel_addr_to_dma(dev, ptr) ((dma_addr_t)(ptr)) + +#else #include <plat/dma_addr.h> +#endif void *dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); |
