1 /* Public domain. */ 2 3 #ifndef _LINUX_DMA_BUF_MAP_H 4 #define _LINUX_DMA_BUF_MAP_H 5 6 #include <linux/io.h> 7 #include <linux/string.h> 8 9 struct dma_buf_map { 10 union { 11 void *vaddr_iomem; 12 void *vaddr; 13 }; 14 bool is_iomem; 15 }; 16 17 static inline void 18 dma_buf_map_incr(struct dma_buf_map *dbm, size_t n) 19 { 20 if (dbm->is_iomem) 21 dbm->vaddr_iomem += n; 22 else 23 dbm->vaddr += n; 24 } 25 26 static inline void 27 dma_buf_map_memcpy_to(struct dma_buf_map *dbm, const void *src, size_t len) 28 { 29 if (dbm->is_iomem) 30 memcpy_toio(dbm->vaddr_iomem, src, len); 31 else 32 memcpy(dbm->vaddr, src, len); 33 } 34 35 static inline bool 36 dma_buf_map_is_null(const struct dma_buf_map *dbm) 37 { 38 if (dbm->is_iomem) 39 return (dbm->vaddr_iomem == NULL); 40 else 41 return (dbm->vaddr == NULL); 42 } 43 44 static inline bool 45 dma_buf_map_is_set(const struct dma_buf_map *dbm) 46 { 47 if (dbm->is_iomem) 48 return (dbm->vaddr_iomem != NULL); 49 else 50 return (dbm->vaddr != NULL); 51 } 52 53 static inline bool 54 dma_buf_map_is_equal( 55 const struct dma_buf_map *dbm_a, const struct dma_buf_map *dbm_b) 56 { 57 if (dbm_a->is_iomem != dbm_b->is_iomem) 58 return (false); 59 60 if (dbm_a->is_iomem) 61 return (dbm_a->vaddr_iomem == dbm_b->vaddr_iomem); 62 else 63 return (dbm_a->vaddr == dbm_b->vaddr); 64 } 65 66 static inline void 67 dma_buf_map_clear(struct dma_buf_map *dbm) 68 { 69 if (dbm->is_iomem) { 70 dbm->vaddr_iomem = NULL; 71 dbm->is_iomem = false; 72 } else { 73 dbm->vaddr = NULL; 74 } 75 } 76 77 static inline void 78 dma_buf_map_set_vaddr_iomem(struct dma_buf_map *dbm, void *addr) 79 { 80 dbm->vaddr_iomem = addr; 81 dbm->is_iomem = true; 82 } 83 84 static inline void 85 dma_buf_map_set_vaddr(struct dma_buf_map *dbm, void *addr) 86 { 87 dbm->vaddr = addr; 88 dbm->is_iomem = false; 89 } 90 91 #endif 92