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 #include <asm/dma-mapping.h> 35 36 /* Backwards compat, remove in 2.7.x */ 37 #define dma_sync_single dma_sync_single_for_cpu 38 #define dma_sync_sg dma_sync_sg_for_cpu 39 40 extern u64 dma_get_required_mask(struct device *dev); 41 42 /* flags for the coherent memory api */ 43 #define DMA_MEMORY_MAP 0x01 44 #define DMA_MEMORY_IO 0x02 45 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 46 #define DMA_MEMORY_EXCLUSIVE 0x08 47 48 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 49 static inline int 50 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 51 dma_addr_t device_addr, size_t size, int flags) 52 { 53 return 0; 54 } 55 56 static inline void 57 dma_release_declared_memory(struct device *dev) 58 { 59 } 60 61 static inline void * 62 dma_mark_declared_memory_occupied(struct device *dev, 63 dma_addr_t device_addr, size_t size) 64 { 65 return ERR_PTR(-EBUSY); 66 } 67 #endif 68 69 #endif 70 71 72