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 */ 9enum 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 27static 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 40extern 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 49static inline int 50dma_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 56static inline void 57dma_release_declared_memory(struct device *dev) 58{ 59} 60 61static inline void * 62dma_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/* 70 * Managed DMA API 71 */ 72extern void *dmam_alloc_coherent(struct device *dev, size_t size, 73 dma_addr_t *dma_handle, gfp_t gfp); 74extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, 75 dma_addr_t dma_handle); 76extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, 77 dma_addr_t *dma_handle, gfp_t gfp); 78extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, 79 dma_addr_t dma_handle); 80#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 81extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 82 dma_addr_t device_addr, size_t size, 83 int flags); 84extern void dmam_release_declared_memory(struct device *dev); 85#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 86static inline int dmam_declare_coherent_memory(struct device *dev, 87 dma_addr_t bus_addr, dma_addr_t device_addr, 88 size_t size, gfp_t gfp) 89{ 90 return 0; 91} 92 93static inline void dmam_release_declared_memory(struct device *dev) 94{ 95} 96#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 97 98#endif 99