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 103