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 9struct dma_buf_map { 10 union { 11 void *vaddr_iomem; 12 void *vaddr; 13 }; 14 bool is_iomem; 15}; 16 17static inline void 18dma_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 26static inline void 27dma_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 35static inline bool 36dma_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 44static inline bool 45dma_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 53static inline bool 54dma_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 66static inline void 67dma_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 77static inline void 78dma_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 84static inline void 85dma_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