diff options
| author | Anup Patel <Anup.Patel@wdc.com> | 2019-02-25 08:14:17 +0000 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2019-02-27 09:12:33 +0800 |
| commit | 70b8562dcf03461cd01bcacab7520c7d1485176c (patch) | |
| tree | 23409e24b386153100d54af5c92a1653ff431c02 /arch/riscv | |
| parent | fdff1f96a6505bccb258f5b52e6c94c7e0b29512 (diff) | |
riscv: Add asm/dma-mapping.h for DMA mappings
This patch adds asm/dma-mapping.h for Linux-like DMA mappings
APIs required by some of the drivers (such as, Cadance MACB
Ethernet driver).
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Diffstat (limited to 'arch/riscv')
| -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 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (c) 2018 Western Digital Corporation or its affiliates. + * + * Authors: + * Anup Patel <anup.patel@wdc.com> + */ + +#ifndef __ASM_RISCV_DMA_MAPPING_H +#define __ASM_RISCV_DMA_MAPPING_H + +#include <linux/dma-direction.h> + +#define dma_mapping_error(x, y) 0 + +static inline void *dma_alloc_coherent(size_t len, unsigned long *handle) +{ + *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len); + return (void *)*handle; +} + +static inline void dma_free_coherent(void *addr) +{ + free(addr); +} + +static inline unsigned long dma_map_single(volatile void *vaddr, size_t len, + enum dma_data_direction dir) +{ + return (unsigned long)vaddr; +} + +static inline void dma_unmap_single(volatile void *vaddr, size_t len, + unsigned long paddr) +{ +} + +#endif /* __ASM_RISCV_DMA_MAPPING_H */ |