Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Borislav Petkov | 34c6538 | 2007-10-18 03:05:06 -0700 | [diff] [blame^] | 16 | #define DMA_BIT_MASK(n) ((1ULL<<(n))-1) |
| 17 | |
| 18 | #define DMA_64BIT_MASK (~0ULL) |
| 19 | #define DMA_48BIT_MASK DMA_BIT_MASK(48) |
| 20 | #define DMA_47BIT_MASK DMA_BIT_MASK(47) |
| 21 | #define DMA_40BIT_MASK DMA_BIT_MASK(40) |
| 22 | #define DMA_39BIT_MASK DMA_BIT_MASK(39) |
| 23 | #define DMA_35BIT_MASK DMA_BIT_MASK(35) |
| 24 | #define DMA_32BIT_MASK DMA_BIT_MASK(32) |
| 25 | #define DMA_31BIT_MASK DMA_BIT_MASK(31) |
| 26 | #define DMA_30BIT_MASK DMA_BIT_MASK(30) |
| 27 | #define DMA_29BIT_MASK DMA_BIT_MASK(29) |
| 28 | #define DMA_28BIT_MASK DMA_BIT_MASK(28) |
| 29 | #define DMA_24BIT_MASK DMA_BIT_MASK(24) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
James Bottomley | 32e8f70 | 2007-10-16 01:23:55 -0700 | [diff] [blame] | 31 | #define DMA_MASK_NONE 0x0ULL |
| 32 | |
Rolf Eike Beer | d6bd3a3 | 2006-09-29 01:59:48 -0700 | [diff] [blame] | 33 | static inline int valid_dma_direction(int dma_direction) |
| 34 | { |
| 35 | return ((dma_direction == DMA_BIDIRECTIONAL) || |
| 36 | (dma_direction == DMA_TO_DEVICE) || |
| 37 | (dma_direction == DMA_FROM_DEVICE)); |
| 38 | } |
| 39 | |
James Bottomley | 32e8f70 | 2007-10-16 01:23:55 -0700 | [diff] [blame] | 40 | static inline int is_device_dma_capable(struct device *dev) |
| 41 | { |
| 42 | return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; |
| 43 | } |
| 44 | |
Dan Williams | 1b0fac4 | 2007-07-15 23:40:26 -0700 | [diff] [blame] | 45 | #ifdef CONFIG_HAS_DMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <asm/dma-mapping.h> |
Dan Williams | 1b0fac4 | 2007-07-15 23:40:26 -0700 | [diff] [blame] | 47 | #else |
| 48 | #include <asm-generic/dma-mapping-broken.h> |
| 49 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | /* Backwards compat, remove in 2.7.x */ |
| 52 | #define dma_sync_single dma_sync_single_for_cpu |
| 53 | #define dma_sync_sg dma_sync_sg_for_cpu |
| 54 | |
| 55 | extern u64 dma_get_required_mask(struct device *dev); |
| 56 | |
| 57 | /* flags for the coherent memory api */ |
| 58 | #define DMA_MEMORY_MAP 0x01 |
| 59 | #define DMA_MEMORY_IO 0x02 |
| 60 | #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 |
| 61 | #define DMA_MEMORY_EXCLUSIVE 0x08 |
| 62 | |
| 63 | #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY |
| 64 | static inline int |
| 65 | dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, |
| 66 | dma_addr_t device_addr, size_t size, int flags) |
| 67 | { |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static inline void |
| 72 | dma_release_declared_memory(struct device *dev) |
| 73 | { |
| 74 | } |
| 75 | |
| 76 | static inline void * |
| 77 | dma_mark_declared_memory_occupied(struct device *dev, |
| 78 | dma_addr_t device_addr, size_t size) |
| 79 | { |
| 80 | return ERR_PTR(-EBUSY); |
| 81 | } |
| 82 | #endif |
| 83 | |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 84 | /* |
| 85 | * Managed DMA API |
| 86 | */ |
| 87 | extern void *dmam_alloc_coherent(struct device *dev, size_t size, |
| 88 | dma_addr_t *dma_handle, gfp_t gfp); |
| 89 | extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, |
| 90 | dma_addr_t dma_handle); |
| 91 | extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, |
| 92 | dma_addr_t *dma_handle, gfp_t gfp); |
| 93 | extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, |
| 94 | dma_addr_t dma_handle); |
| 95 | #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY |
| 96 | extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, |
| 97 | dma_addr_t device_addr, size_t size, |
| 98 | int flags); |
| 99 | extern void dmam_release_declared_memory(struct device *dev); |
| 100 | #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ |
| 101 | static inline int dmam_declare_coherent_memory(struct device *dev, |
| 102 | dma_addr_t bus_addr, dma_addr_t device_addr, |
| 103 | size_t size, gfp_t gfp) |
| 104 | { |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | static inline void dmam_release_declared_memory(struct device *dev) |
| 109 | { |
| 110 | } |
| 111 | #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | #endif |