diff options
author | Iru Cai <mytbk920423@gmail.com> | 2019-10-30 14:21:52 +0800 |
---|---|---|
committer | Iru Cai <mytbk920423@gmail.com> | 2019-10-30 14:48:38 +0800 |
commit | ae51f41d14f548d494ac41e0d21137c5a4c3f59c (patch) | |
tree | 6ddb9d1aaa7bd5bad5bbf8497edc2e08ff208d79 /arch/nios2/include/asm/dma-mapping.h | |
download | uext4-ae51f41d14f548d494ac41e0d21137c5a4c3f59c.tar.xz |
import the U-Boot code and make it compile
Diffstat (limited to 'arch/nios2/include/asm/dma-mapping.h')
-rw-r--r-- | arch/nios2/include/asm/dma-mapping.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h new file mode 100644 index 0000000..65f67bc --- /dev/null +++ b/arch/nios2/include/asm/dma-mapping.h @@ -0,0 +1,24 @@ +#ifndef __ASM_NIOS2_DMA_MAPPING_H +#define __ASM_NIOS2_DMA_MAPPING_H + +#include <memalign.h> +#include <asm/io.h> + +/* + * dma_alloc_coherent() return cache-line aligned allocation which is mapped + * to uncached io region. + */ +static inline void *dma_alloc_coherent(size_t len, unsigned long *handle) +{ + unsigned long addr = (unsigned long)malloc_cache_aligned(len); + + if (!addr) + return NULL; + + invalidate_dcache_range(addr, addr + len); + if (handle) + *handle = addr; + + return map_physmem(addr, len, MAP_NOCACHE); +} +#endif /* __ASM_NIOS2_DMA_MAPPING_H */ |