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_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) 17 18 /* 19 * NOTE: do not use the below macros in new code and do not add new definitions 20 * here. 21 * 22 * Instead, just open-code DMA_BIT_MASK(n) within your driver 23 */ 24 #define DMA_64BIT_MASK DMA_BIT_MASK(64) 25 #define DMA_48BIT_MASK DMA_BIT_MASK(48) 26 #define DMA_47BIT_MASK DMA_BIT_MASK(47) 27 #define DMA_40BIT_MASK DMA_BIT_MASK(40) 28 #define DMA_39BIT_MASK DMA_BIT_MASK(39) 29 #define DMA_35BIT_MASK DMA_BIT_MASK(35) 30 #define DMA_32BIT_MASK DMA_BIT_MASK(32) 31 #define DMA_31BIT_MASK DMA_BIT_MASK(31) 32 #define DMA_30BIT_MASK DMA_BIT_MASK(30) 33 #define DMA_29BIT_MASK DMA_BIT_MASK(29) 34 #define DMA_28BIT_MASK DMA_BIT_MASK(28) 35 #define DMA_24BIT_MASK DMA_BIT_MASK(24) 36 37 #define DMA_MASK_NONE 0x0ULL 38 39 static inline int valid_dma_direction(int dma_direction) 40 { 41 return ((dma_direction == DMA_BIDIRECTIONAL) || 42 (dma_direction == DMA_TO_DEVICE) || 43 (dma_direction == DMA_FROM_DEVICE)); 44 } 45 46 static inline int is_device_dma_capable(struct device *dev) 47 { 48 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; 49 } 50 51 #ifdef CONFIG_HAS_DMA 52 #include <asm/dma-mapping.h> 53 #else 54 #include <asm-generic/dma-mapping-broken.h> 55 #endif 56 57 /* Backwards compat, remove in 2.7.x */ 58 #define dma_sync_single dma_sync_single_for_cpu 59 #define dma_sync_sg dma_sync_sg_for_cpu 60 61 extern u64 dma_get_required_mask(struct device *dev); 62 63 /* flags for the coherent memory api */ 64 #define DMA_MEMORY_MAP 0x01 65 #define DMA_MEMORY_IO 0x02 66 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 67 #define DMA_MEMORY_EXCLUSIVE 0x08 68 69 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 70 static inline int 71 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 72 dma_addr_t device_addr, size_t size, int flags) 73 { 74 return 0; 75 } 76 77 static inline void 78 dma_release_declared_memory(struct device *dev) 79 { 80 } 81 82 static inline void * 83 dma_mark_declared_memory_occupied(struct device *dev, 84 dma_addr_t device_addr, size_t size) 85 { 86 return ERR_PTR(-EBUSY); 87 } 88 #endif 89 90 /* 91 * Managed DMA API 92 */ 93 extern void *dmam_alloc_coherent(struct device *dev, size_t size, 94 dma_addr_t *dma_handle, gfp_t gfp); 95 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, 96 dma_addr_t dma_handle); 97 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, 98 dma_addr_t *dma_handle, gfp_t gfp); 99 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, 100 dma_addr_t dma_handle); 101 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 102 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 103 dma_addr_t device_addr, size_t size, 104 int flags); 105 extern void dmam_release_declared_memory(struct device *dev); 106 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 107 static inline int dmam_declare_coherent_memory(struct device *dev, 108 dma_addr_t bus_addr, dma_addr_t device_addr, 109 size_t size, gfp_t gfp) 110 { 111 return 0; 112 } 113 114 static inline void dmam_release_declared_memory(struct device *dev) 115 { 116 } 117 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 118 119 #endif 120