dma-mapping.h revision 73e5a848426fae8e7f1f685389aa61d7a98e7c36 
1#ifndef _ASM_S390_DMA_MAPPING_H
2#define _ASM_S390_DMA_MAPPING_H
3
4#include <linux/kernel.h>
5#include <linux/types.h>
6#include <linux/mm.h>
7#include <linux/scatterlist.h>
8#include <linux/dma-attrs.h>
9#include <linux/dma-debug.h>
10#include <linux/io.h>
11
12#define DMA_ERROR_CODE		(~(dma_addr_t) 0x0)
13
14extern struct dma_map_ops s390_dma_ops;
15
16static inline struct dma_map_ops *get_dma_ops(struct device *dev)
17{
18	return &s390_dma_ops;
19}
20
21extern int dma_set_mask(struct device *dev, u64 mask);
22
23static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
24				  enum dma_data_direction direction)
25{
26}
27
28#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
29#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
30
31#include <asm-generic/dma-mapping-common.h>
32
33static inline int dma_supported(struct device *dev, u64 mask)
34{
35	struct dma_map_ops *dma_ops = get_dma_ops(dev);
36
37	if (dma_ops->dma_supported == NULL)
38		return 1;
39	return dma_ops->dma_supported(dev, mask);
40}
41
42static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
43{
44	if (!dev->dma_mask)
45		return 0;
46	return addr + size - 1 <= *dev->dma_mask;
47}
48
49static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
50{
51	struct dma_map_ops *dma_ops = get_dma_ops(dev);
52
53	if (dma_ops->mapping_error)
54		return dma_ops->mapping_error(dev, dma_addr);
55	return (dma_addr == DMA_ERROR_CODE);
56}
57
58static inline void *dma_alloc_coherent(struct device *dev, size_t size,
59				       dma_addr_t *dma_handle, gfp_t flag)
60{
61	struct dma_map_ops *ops = get_dma_ops(dev);
62	void *ret;
63
64	ret = ops->alloc(dev, size, dma_handle, flag, NULL);
65	debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
66	return ret;
67}
68
69static inline void dma_free_coherent(struct device *dev, size_t size,
70				     void *cpu_addr, dma_addr_t dma_handle)
71{
72	struct dma_map_ops *dma_ops = get_dma_ops(dev);
73
74	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
75	dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
76}
77
78#endif /* _ASM_S390_DMA_MAPPING_H */
79