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_40BIT_MASK 0x000000ffffffffffULL 18 #define DMA_39BIT_MASK 0x0000007fffffffffULL 19 #define DMA_32BIT_MASK 0x00000000ffffffffULL 20 #define DMA_31BIT_MASK 0x000000007fffffffULL 21 #define DMA_30BIT_MASK 0x000000003fffffffULL 22 #define DMA_29BIT_MASK 0x000000001fffffffULL 23 #define DMA_28BIT_MASK 0x000000000fffffffULL 24 #define DMA_24BIT_MASK 0x0000000000ffffffULL 25 26 #include <asm/dma-mapping.h> 27 28 /* Backwards compat, remove in 2.7.x */ 29 #define dma_sync_single dma_sync_single_for_cpu 30 #define dma_sync_sg dma_sync_sg_for_cpu 31 32 extern u64 dma_get_required_mask(struct device *dev); 33 34 /* flags for the coherent memory api */ 35 #define DMA_MEMORY_MAP 0x01 36 #define DMA_MEMORY_IO 0x02 37 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 38 #define DMA_MEMORY_EXCLUSIVE 0x08 39 40 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 41 static inline int 42 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 43 dma_addr_t device_addr, size_t size, int flags) 44 { 45 return 0; 46 } 47 48 static inline void 49 dma_release_declared_memory(struct device *dev) 50 { 51 } 52 53 static inline void * 54 dma_mark_declared_memory_occupied(struct device *dev, 55 dma_addr_t device_addr, size_t size) 56 { 57 return ERR_PTR(-EBUSY); 58 } 59 #endif 60 61 #endif 62 63 64