Linux kernel mirror (for testing)
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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_48BIT_MASK 0x0000ffffffffffffULL
18#define DMA_40BIT_MASK 0x000000ffffffffffULL
19#define DMA_39BIT_MASK 0x0000007fffffffffULL
20#define DMA_32BIT_MASK 0x00000000ffffffffULL
21#define DMA_31BIT_MASK 0x000000007fffffffULL
22#define DMA_30BIT_MASK 0x000000003fffffffULL
23#define DMA_29BIT_MASK 0x000000001fffffffULL
24#define DMA_28BIT_MASK 0x000000000fffffffULL
25#define DMA_24BIT_MASK 0x0000000000ffffffULL
26
27static inline int valid_dma_direction(int dma_direction)
28{
29 return ((dma_direction == DMA_BIDIRECTIONAL) ||
30 (dma_direction == DMA_TO_DEVICE) ||
31 (dma_direction == DMA_FROM_DEVICE));
32}
33
34#ifdef CONFIG_HAS_DMA
35#include <asm/dma-mapping.h>
36#else
37#include <asm-generic/dma-mapping-broken.h>
38#endif
39
40/* Backwards compat, remove in 2.7.x */
41#define dma_sync_single dma_sync_single_for_cpu
42#define dma_sync_sg dma_sync_sg_for_cpu
43
44extern u64 dma_get_required_mask(struct device *dev);
45
46/* flags for the coherent memory api */
47#define DMA_MEMORY_MAP 0x01
48#define DMA_MEMORY_IO 0x02
49#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
50#define DMA_MEMORY_EXCLUSIVE 0x08
51
52#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
53static inline int
54dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
55 dma_addr_t device_addr, size_t size, int flags)
56{
57 return 0;
58}
59
60static inline void
61dma_release_declared_memory(struct device *dev)
62{
63}
64
65static inline void *
66dma_mark_declared_memory_occupied(struct device *dev,
67 dma_addr_t device_addr, size_t size)
68{
69 return ERR_PTR(-EBUSY);
70}
71#endif
72
73/*
74 * Managed DMA API
75 */
76extern void *dmam_alloc_coherent(struct device *dev, size_t size,
77 dma_addr_t *dma_handle, gfp_t gfp);
78extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
79 dma_addr_t dma_handle);
80extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
81 dma_addr_t *dma_handle, gfp_t gfp);
82extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
83 dma_addr_t dma_handle);
84#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
85extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
86 dma_addr_t device_addr, size_t size,
87 int flags);
88extern void dmam_release_declared_memory(struct device *dev);
89#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
90static inline int dmam_declare_coherent_memory(struct device *dev,
91 dma_addr_t bus_addr, dma_addr_t device_addr,
92 size_t size, gfp_t gfp)
93{
94 return 0;
95}
96
97static inline void dmam_release_declared_memory(struct device *dev)
98{
99}
100#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
101
102#endif