dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs
[linux-2.6.git] / include / linux / dma-mapping.h
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 */
9 enum 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
27 static 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
44 extern 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
53 static inline int
54 dma_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
60 static inline void
61 dma_release_declared_memory(struct device *dev)
62 {
63 }
64
65 static inline void *
66 dma_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  */
76 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
77                                  dma_addr_t *dma_handle, gfp_t gfp);
78 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
79                                dma_addr_t dma_handle);
80 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
81                                     dma_addr_t *dma_handle, gfp_t gfp);
82 extern 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
85 extern 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);
88 extern void dmam_release_declared_memory(struct device *dev);
89 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
90 static 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
97 static inline void dmam_release_declared_memory(struct device *dev)
98 {
99 }
100 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
101
102 #endif