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x86: Add dma-mapping.h to architectural code

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Some cross-platform drivers rely on this header present.
Make it so for x86.

It's just a copy'n'paste of arch/arm/include/asm/dma-mapping.h.

Suggested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Andy Shevchenko 2017-07-06 14:41:51 +03:00 committed by Bin Meng
parent 8f8a12d1e7
commit b7026b0c98
1 changed files with 41 additions and 0 deletions
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41
arch/x86/include/asm/dma-mapping.h Normal file
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/*
* (C) Copyright 2007
* Stelian Pop <stelian@popies.net>
* Lead Tech Design <www.leadtechdesign.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_X86_DMA_MAPPING_H
#define __ASM_X86_DMA_MAPPING_H
#define dma_mapping_error(x, y) 0
enum dma_data_direction {
DMA_BIDIRECTIONAL = 0,
DMA_TO_DEVICE = 1,
DMA_FROM_DEVICE = 2,
};
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_X86_DMA_MAPPING_H */