Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _ASM_LINUX_DMA_MAPPING_H
2#define _ASM_LINUX_DMA_MAPPING_H
3
4#include <linux/device.h>
5#include <linux/err.h>
6
7/* These definitions mirror those in pci.h, so they can be used
8 * interchangeably with their PCI_ counterparts */
9enum dma_data_direction {
10 DMA_BIDIRECTIONAL = 0,
11 DMA_TO_DEVICE = 1,
12 DMA_FROM_DEVICE = 2,
13 DMA_NONE = 3,
14};
15
16#define DMA_64BIT_MASK 0xffffffffffffffffULL
17#define DMA_32BIT_MASK 0x00000000ffffffffULL
18
19#include <asm/dma-mapping.h>
20
21/* Backwards compat, remove in 2.7.x */
22#define dma_sync_single dma_sync_single_for_cpu
23#define dma_sync_sg dma_sync_sg_for_cpu
24
25extern u64 dma_get_required_mask(struct device *dev);
26
27/* flags for the coherent memory api */
28#define DMA_MEMORY_MAP 0x01
29#define DMA_MEMORY_IO 0x02
30#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
31#define DMA_MEMORY_EXCLUSIVE 0x08
32
33#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
34static inline int
35dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
36 dma_addr_t device_addr, size_t size, int flags)
37{
38 return 0;
39}
40
41static inline void
42dma_release_declared_memory(struct device *dev)
43{
44}
45
46static inline void *
47dma_mark_declared_memory_occupied(struct device *dev,
48 dma_addr_t device_addr, size_t size)
49{
50 return ERR_PTR(-EBUSY);
51}
52#endif
53
54#endif
55
56