#ifndef _LINUX_DMA_MAPPING_H #define _LINUX_DMA_MAPPING_H #include <linux/device.h> #include <linux/err.h> #include <linux/dma-attrs.h> #include <linux/scatterlist.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, }; struct dma_map_ops { void* (*alloc_coherent)(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); void (*free_coherent)(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); dma_addr_t (*map_page)(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); void (*unmap_page)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); void (*sync_single_for_device)(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir); void (*sync_single_range_for_cpu)(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction dir); void (*sync_single_range_for_device)(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction dir); void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir); void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir); int (*mapping_error)(struct device *dev, dma_addr_t dma_addr); int (*dma_supported)(struct device *dev, u64 mask); int is_phys; }; #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) typedef u64 DMA_nnBIT_MASK __deprecated; /* * 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_nnBIT_MASK)DMA_BIT_MASK(64) #define DMA_48BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(48) #define DMA_47BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(47) #define DMA_40BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(40) #define DMA_39BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(39) #define DMA_35BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(35) #define DMA_32BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(32) #define DMA_31BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(31) #define DMA_30BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(30) #define DMA_29BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(29) #define DMA_28BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(28) #define DMA_24BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(24) #define DMA_MASK_NONE 0x0ULL static inline int valid_dma_direction(int dma_direction) { return ((dma_direction == DMA_BIDIRECTIONAL) || (dma_direction == DMA_TO_DEVICE) || (dma_direction == DMA_FROM_DEVICE)); } static inline int is_device_dma_capable(struct device *dev) { return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; } static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size) { return addr + size <= mask; } #ifdef CONFIG_HAS_DMA #include <asm/dma-mapping.h> #else #include <asm-generic/dma-mapping-broken.h> #endif /* for backwards compatibility, removed soon */ static inline void __deprecated dma_sync_single(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) { dma_sync_single_for_cpu(dev, addr, size, dir); } static inline void __deprecated dma_sync_sg(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction dir) { dma_sync_sg_for_cpu(dev, sg, nelems, dir); } static inline u64 dma_get_mask(struct device *dev) { if (dev && dev->dma_mask && *dev->dma_mask) return *dev->dma_mask; return DMA_BIT_MASK(32); } extern u64 dma_get_required_mask(struct device *dev); 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; } 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; } /* 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 /* * 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; } static inline void dmam_release_declared_memory(struct device *dev) { } #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ #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 */ #endif