tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __ASM_SH_DMA_MAPPING_H
2#define __ASM_SH_DMA_MAPPING_H
3
4extern struct dma_map_ops *dma_ops;
5extern void no_iommu_init(void);
6
7static inline struct dma_map_ops *get_dma_ops(struct device *dev)
8{
9 return dma_ops;
10}
11
12#include <asm-generic/dma-coherent.h>
13#include <asm-generic/dma-mapping-common.h>
14
15static inline int dma_supported(struct device *dev, u64 mask)
16{
17 struct dma_map_ops *ops = get_dma_ops(dev);
18
19 if (ops->dma_supported)
20 return ops->dma_supported(dev, mask);
21
22 return 1;
23}
24
25static inline int dma_set_mask(struct device *dev, u64 mask)
26{
27 struct dma_map_ops *ops = get_dma_ops(dev);
28
29 if (!dev->dma_mask || !dma_supported(dev, mask))
30 return -EIO;
31 if (ops->set_dma_mask)
32 return ops->set_dma_mask(dev, mask);
33
34 *dev->dma_mask = mask;
35
36 return 0;
37}
38
39void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
40 enum dma_data_direction dir);
41
42#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
43#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
44
45#ifdef CONFIG_DMA_COHERENT
46#define dma_is_consistent(d, h) (1)
47#else
48#define dma_is_consistent(d, h) (0)
49#endif
50
51static inline int dma_get_cache_alignment(void)
52{
53 /*
54 * Each processor family will define its own L1_CACHE_SHIFT,
55 * L1_CACHE_BYTES wraps to this, so this is always safe.
56 */
57 return L1_CACHE_BYTES;
58}
59
60static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
61{
62 struct dma_map_ops *ops = get_dma_ops(dev);
63
64 if (ops->mapping_error)
65 return ops->mapping_error(dev, dma_addr);
66
67 return dma_addr == 0;
68}
69
70static inline void *dma_alloc_coherent(struct device *dev, size_t size,
71 dma_addr_t *dma_handle, gfp_t gfp)
72{
73 struct dma_map_ops *ops = get_dma_ops(dev);
74 void *memory;
75
76 if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
77 return memory;
78 if (!ops->alloc_coherent)
79 return NULL;
80
81 memory = ops->alloc_coherent(dev, size, dma_handle, gfp);
82 debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
83
84 return memory;
85}
86
87static inline void dma_free_coherent(struct device *dev, size_t size,
88 void *vaddr, dma_addr_t dma_handle)
89{
90 struct dma_map_ops *ops = get_dma_ops(dev);
91
92 if (dma_release_from_coherent(dev, get_order(size), vaddr))
93 return;
94
95 debug_dma_free_coherent(dev, size, vaddr, dma_handle);
96 if (ops->free_coherent)
97 ops->free_coherent(dev, size, vaddr, dma_handle);
98}
99
100/* arch/sh/mm/consistent.c */
101extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
102 dma_addr_t *dma_addr, gfp_t flag);
103extern void dma_generic_free_coherent(struct device *dev, size_t size,
104 void *vaddr, dma_addr_t dma_handle);
105
106#endif /* __ASM_SH_DMA_MAPPING_H */