52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#ifndef _LINUX_DMA_MAPPING_H
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#define _LINUX_DMA_MAPPING_H
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#include <linux/sizes.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/dma-attrs.h>
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#include <linux/dma-direction.h>
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#include <linux/scatterlist.h>
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extern void *
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dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flag);
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#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
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#define DMA_MASK_NONE 0x0ULL
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static inline int valid_dma_direction(int dma_direction)
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{
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return ((dma_direction == DMA_BIDIRECTIONAL) ||
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(dma_direction == DMA_TO_DEVICE) ||
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(dma_direction == DMA_FROM_DEVICE));
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}
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static inline int is_device_dma_capable(struct device *dev)
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{
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return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
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}
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#ifdef CONFIG_HAS_DMA
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#include <asm/dma-mapping.h>
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#else
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#include <asm-generic/dma-mapping-broken.h>
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#endif
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#ifndef dma_max_pfn
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static inline unsigned long dma_max_pfn(struct device *dev)
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{
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return *dev->dma_mask >> PAGE_SHIFT;
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}
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#endif
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static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag)
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{
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void *ret = dma_alloc_coherent(dev, size, dma_handle,
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flag | __GFP_ZERO);
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return ret;
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}
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#endif
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