diff options
Diffstat (limited to 'arch/riscv/include/asm/dma-mapping.h')
-rw-r--r-- | arch/riscv/include/asm/dma-mapping.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/dma-mapping.h b/arch/riscv/include/asm/dma-mapping.h new file mode 100644 index 0000000000..3d930c90ec --- /dev/null +++ b/arch/riscv/include/asm/dma-mapping.h | |||
@@ -0,0 +1,38 @@ | |||
1 | /* SPDX-License-Identifier: GPL-2.0+ */ | ||
2 | /* | ||
3 | * Copyright (c) 2018 Western Digital Corporation or its affiliates. | ||
4 | * | ||
5 | * Authors: | ||
6 | * Anup Patel <anup.patel@wdc.com> | ||
7 | */ | ||
8 | |||
9 | #ifndef __ASM_RISCV_DMA_MAPPING_H | ||
10 | #define __ASM_RISCV_DMA_MAPPING_H | ||
11 | |||
12 | #include <linux/dma-direction.h> | ||
13 | |||
14 | #define dma_mapping_error(x, y) 0 | ||
15 | |||
16 | static inline void *dma_alloc_coherent(size_t len, unsigned long *handle) | ||
17 | { | ||
18 | *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len); | ||
19 | return (void *)*handle; | ||
20 | } | ||
21 | |||
22 | static inline void dma_free_coherent(void *addr) | ||
23 | { | ||
24 | free(addr); | ||
25 | } | ||
26 | |||
27 | static inline unsigned long dma_map_single(volatile void *vaddr, size_t len, | ||
28 | enum dma_data_direction dir) | ||
29 | { | ||
30 | return (unsigned long)vaddr; | ||
31 | } | ||
32 | |||
33 | static inline void dma_unmap_single(volatile void *vaddr, size_t len, | ||
34 | unsigned long paddr) | ||
35 | { | ||
36 | } | ||
37 | |||
38 | #endif /* __ASM_RISCV_DMA_MAPPING_H */ | ||