| #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_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 (*set_dma_mask)(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; |
| } |
| |
| #ifdef CONFIG_HAS_DMA |
| #include <asm/dma-mapping.h> |
| #else |
| #include <asm-generic/dma-mapping-broken.h> |
| #endif |
| |
| 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); |
| } |
| |
| static inline int dma_set_coherent_mask(struct device *dev, u64 mask) |
| { |
| if (!dma_supported(dev, mask)) |
| return -EIO; |
| dev->coherent_dma_mask = mask; |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| static inline int dma_get_cache_alignment(void) |
| { |
| #ifdef ARCH_DMA_MINALIGN |
| return ARCH_DMA_MINALIGN; |
| #endif |
| return 1; |
| } |
| |
| /* 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 */ |
| |
| #ifdef CONFIG_NEED_DMA_MAP_STATE |
| #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME |
| #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME |
| #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME) |
| #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL)) |
| #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME) |
| #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL)) |
| #else |
| #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) |
| #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) |
| #define dma_unmap_addr(PTR, ADDR_NAME) (0) |
| #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) |
| #define dma_unmap_len(PTR, LEN_NAME) (0) |
| #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) |
| #endif |
| |
| #endif |