1 #ifndef _ASM_LINUX_DMA_MAPPING_H
2 #define _ASM_LINUX_DMA_MAPPING_H
4 #include <linux/device.h>
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,
16 #define DMA_BIT_MASK(n) ((1ULL<<(n))-1)
18 #define DMA_64BIT_MASK (~0ULL)
19 #define DMA_48BIT_MASK DMA_BIT_MASK(48)
20 #define DMA_47BIT_MASK DMA_BIT_MASK(47)
21 #define DMA_40BIT_MASK DMA_BIT_MASK(40)
22 #define DMA_39BIT_MASK DMA_BIT_MASK(39)
23 #define DMA_35BIT_MASK DMA_BIT_MASK(35)
24 #define DMA_32BIT_MASK DMA_BIT_MASK(32)
25 #define DMA_31BIT_MASK DMA_BIT_MASK(31)
26 #define DMA_30BIT_MASK DMA_BIT_MASK(30)
27 #define DMA_29BIT_MASK DMA_BIT_MASK(29)
28 #define DMA_28BIT_MASK DMA_BIT_MASK(28)
29 #define DMA_24BIT_MASK DMA_BIT_MASK(24)
31 #define DMA_MASK_NONE 0x0ULL
33 static inline int valid_dma_direction(int dma_direction)
35 return ((dma_direction == DMA_BIDIRECTIONAL) ||
36 (dma_direction == DMA_TO_DEVICE) ||
37 (dma_direction == DMA_FROM_DEVICE));
40 static inline int is_device_dma_capable(struct device *dev)
42 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
46 #include <asm/dma-mapping.h>
48 #include <asm-generic/dma-mapping-broken.h>
51 /* Backwards compat, remove in 2.7.x */
52 #define dma_sync_single dma_sync_single_for_cpu
53 #define dma_sync_sg dma_sync_sg_for_cpu
55 extern u64 dma_get_required_mask(struct device *dev);
57 /* flags for the coherent memory api */
58 #define DMA_MEMORY_MAP 0x01
59 #define DMA_MEMORY_IO 0x02
60 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
61 #define DMA_MEMORY_EXCLUSIVE 0x08
63 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
65 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
66 dma_addr_t device_addr, size_t size, int flags)
72 dma_release_declared_memory(struct device *dev)
77 dma_mark_declared_memory_occupied(struct device *dev,
78 dma_addr_t device_addr, size_t size)
80 return ERR_PTR(-EBUSY);
87 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
88 dma_addr_t *dma_handle, gfp_t gfp);
89 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
90 dma_addr_t dma_handle);
91 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
92 dma_addr_t *dma_handle, gfp_t gfp);
93 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
94 dma_addr_t dma_handle);
95 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
96 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
97 dma_addr_t device_addr, size_t size,
99 extern void dmam_release_declared_memory(struct device *dev);
100 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
101 static inline int dmam_declare_coherent_memory(struct device *dev,
102 dma_addr_t bus_addr, dma_addr_t device_addr,
103 size_t size, gfp_t gfp)
108 static inline void dmam_release_declared_memory(struct device *dev)
111 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */