mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-28 07:03:31 +08:00
9d86b89c59
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+ */
|
|
/*
|
|
* 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 <common.h>
|
|
#include <linux/types.h>
|
|
#include <asm/cache.h>
|
|
#include <cpu_func.h>
|
|
#include <linux/dma-direction.h>
|
|
#include <malloc.h>
|
|
|
|
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);
|
|
}
|
|
|
|
#endif /* __ASM_RISCV_DMA_MAPPING_H */
|