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The implementation of dma_map_single() and dma_unmap_single() is exactly the same for all the architectures that support them. Factor them out to <linux/dma-mapping.h>, and make all drivers to include <linux/dma-mapping.h> instead of <asm/dma-mapping.h>. If we need to differentiate them for some architectures, we can move the generic definitions to <asm-generic/dma-mapping.h>. Add some comments to the helpers. The concept is quite similar to the DMA-API of Linux kernel. Drivers are agnostic about what is going on behind the scene. Just call dma_map_single() before the DMA, and dma_unmap_single() after it. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
31 lines
652 B
C
31 lines
652 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 <common.h>
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#include <linux/types.h>
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#include <asm/cache.h>
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#include <cpu_func.h>
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#include <linux/dma-direction.h>
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#include <malloc.h>
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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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#endif /* __ASM_RISCV_DMA_MAPPING_H */
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