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 #define DMA_MASK_NONE 0x0ULL 28 29 static inline int valid_dma_direction(int dma_direction) 30 { 31 return ((dma_direction == DMA_BIDIRECTIONAL) || 32 (dma_direction == DMA_TO_DEVICE) || 33 (dma_direction == DMA_FROM_DEVICE)); 34 } 35 36 static inline int is_device_dma_capable(struct device *dev) 37 { 38 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; 39 } 40 41 #ifdef CONFIG_HAS_DMA 42 #include <asm/dma-mapping.h> 43 #else 44 #include <asm-generic/dma-mapping-broken.h> 45 #endif 46 47 /* Backwards compat, remove in 2.7.x */ 48 #define dma_sync_single dma_sync_single_for_cpu 49 #define dma_sync_sg dma_sync_sg_for_cpu 50 51 extern u64 dma_get_required_mask(struct device *dev); 52 53 /* flags for the coherent memory api */ 54 #define DMA_MEMORY_MAP 0x01 55 #define DMA_MEMORY_IO 0x02 56 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 57 #define DMA_MEMORY_EXCLUSIVE 0x08 58 59 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 60 static inline int 61 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 62 dma_addr_t device_addr, size_t size, int flags) 63 { 64 return 0; 65 } 66 67 static inline void 68 dma_release_declared_memory(struct device *dev) 69 { 70 } 71 72 static inline void * 73 dma_mark_declared_memory_occupied(struct device *dev, 74 dma_addr_t device_addr, size_t size) 75 { 76 return ERR_PTR(-EBUSY); 77 } 78 #endif 79 80 /* 81 * Managed DMA API 82 */ 83 extern void *dmam_alloc_coherent(struct device *dev, size_t size, 84 dma_addr_t *dma_handle, gfp_t gfp); 85 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, 86 dma_addr_t dma_handle); 87 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, 88 dma_addr_t *dma_handle, gfp_t gfp); 89 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, 90 dma_addr_t dma_handle); 91 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 92 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 93 dma_addr_t device_addr, size_t size, 94 int flags); 95 extern void dmam_release_declared_memory(struct device *dev); 96 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 97 static inline int dmam_declare_coherent_memory(struct device *dev, 98 dma_addr_t bus_addr, dma_addr_t device_addr, 99 size_t size, gfp_t gfp) 100 { 101 return 0; 102 } 103 104 static inline void dmam_release_declared_memory(struct device *dev) 105 { 106 } 107 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 108 109 #endif 110