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70b8562dcf
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>
39 lines
830 B
C
39 lines
830 B
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2018 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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*/
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#ifndef __ASM_RISCV_DMA_MAPPING_H
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#define __ASM_RISCV_DMA_MAPPING_H
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#include <linux/dma-direction.h>
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#define dma_mapping_error(x, y) 0
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static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
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{
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*handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
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return (void *)*handle;
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}
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static inline void dma_free_coherent(void *addr)
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{
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free(addr);
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}
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static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
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enum dma_data_direction dir)
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{
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return (unsigned long)vaddr;
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}
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static inline void dma_unmap_single(volatile void *vaddr, size_t len,
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unsigned long paddr)
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{
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}
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#endif /* __ASM_RISCV_DMA_MAPPING_H */
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