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