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include/linux/dma-mapping.h
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#ifndef _LINUX_DMA_MAPPING_H #define _LINUX_DMA_MAPPING_H |
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#include <linux/device.h> #include <linux/err.h> /* These definitions mirror those in pci.h, so they can be used * interchangeably with their PCI_ counterparts */ enum dma_data_direction { DMA_BIDIRECTIONAL = 0, DMA_TO_DEVICE = 1, DMA_FROM_DEVICE = 2, DMA_NONE = 3, }; |
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#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) |
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/* * NOTE: do not use the below macros in new code and do not add new definitions * here. * * Instead, just open-code DMA_BIT_MASK(n) within your driver */ #define DMA_64BIT_MASK DMA_BIT_MASK(64) |
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#define DMA_48BIT_MASK DMA_BIT_MASK(48) #define DMA_47BIT_MASK DMA_BIT_MASK(47) #define DMA_40BIT_MASK DMA_BIT_MASK(40) #define DMA_39BIT_MASK DMA_BIT_MASK(39) #define DMA_35BIT_MASK DMA_BIT_MASK(35) #define DMA_32BIT_MASK DMA_BIT_MASK(32) #define DMA_31BIT_MASK DMA_BIT_MASK(31) #define DMA_30BIT_MASK DMA_BIT_MASK(30) #define DMA_29BIT_MASK DMA_BIT_MASK(29) #define DMA_28BIT_MASK DMA_BIT_MASK(28) #define DMA_24BIT_MASK DMA_BIT_MASK(24) |
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#define DMA_MASK_NONE 0x0ULL |
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static inline int valid_dma_direction(int dma_direction) { return ((dma_direction == DMA_BIDIRECTIONAL) || (dma_direction == DMA_TO_DEVICE) || (dma_direction == DMA_FROM_DEVICE)); } |
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static inline int is_device_dma_capable(struct device *dev) { return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; } |
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static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size) { return addr + size <= mask; } |
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#ifdef CONFIG_HAS_DMA |
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#include <asm/dma-mapping.h> |
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#else #include <asm-generic/dma-mapping-broken.h> #endif |
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/* Backwards compat, remove in 2.7.x */ #define dma_sync_single dma_sync_single_for_cpu #define dma_sync_sg dma_sync_sg_for_cpu |
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static inline u64 dma_get_mask(struct device *dev) { |
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if (dev && dev->dma_mask && *dev->dma_mask) |
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return *dev->dma_mask; return DMA_32BIT_MASK; } |
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extern u64 dma_get_required_mask(struct device *dev); |
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static inline unsigned int dma_get_max_seg_size(struct device *dev) { return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; } static inline unsigned int dma_set_max_seg_size(struct device *dev, unsigned int size) { if (dev->dma_parms) { dev->dma_parms->max_segment_size = size; return 0; } else return -EIO; } |
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static inline unsigned long dma_get_seg_boundary(struct device *dev) { return dev->dma_parms ? dev->dma_parms->segment_boundary_mask : 0xffffffff; } static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) { if (dev->dma_parms) { dev->dma_parms->segment_boundary_mask = mask; return 0; } else return -EIO; } |
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/* flags for the coherent memory api */ #define DMA_MEMORY_MAP 0x01 #define DMA_MEMORY_IO 0x02 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 #define DMA_MEMORY_EXCLUSIVE 0x08 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY static inline int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, int flags) { return 0; } static inline void dma_release_declared_memory(struct device *dev) { } static inline void * dma_mark_declared_memory_occupied(struct device *dev, dma_addr_t device_addr, size_t size) { return ERR_PTR(-EBUSY); } #endif |
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/* * Managed DMA API */ extern void *dmam_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, int flags); extern void dmam_release_declared_memory(struct device *dev); #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ static inline int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, gfp_t gfp) { return 0; } |
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static inline void dmam_release_declared_memory(struct device *dev) { } #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ |
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#ifndef CONFIG_HAVE_DMA_ATTRS struct dma_attrs; #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ dma_map_single(dev, cpu_addr, size, dir) #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ dma_unmap_single(dev, dma_addr, size, dir) #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ dma_map_sg(dev, sgl, nents, dir) #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ dma_unmap_sg(dev, sgl, nents, dir) #endif /* CONFIG_HAVE_DMA_ATTRS */ |
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#endif |