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riscv: Add asm/dma-mapping.h for DMA mappings

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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>
This commit is contained in:
Anup Patel 2019-02-25 08:14:17 +00:00 committed by Andes
parent fdff1f96a6
commit 70b8562dcf
1 changed files with 38 additions and 0 deletions
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38
arch/riscv/include/asm/dma-mapping.h Normal file
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/* 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 */