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09b55412 CM |
1 | /* |
2 | * Copyright (C) 2012 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | #ifndef __ASM_DMA_MAPPING_H | |
17 | #define __ASM_DMA_MAPPING_H | |
18 | ||
19 | #ifdef __KERNEL__ | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/vmalloc.h> | |
23 | ||
24 | #include <asm-generic/dma-coherent.h> | |
25 | ||
26 | #define ARCH_HAS_DMA_GET_REQUIRED_MASK | |
27 | ||
28 | extern struct dma_map_ops *dma_ops; | |
29 | ||
30 | static inline struct dma_map_ops *get_dma_ops(struct device *dev) | |
31 | { | |
32 | if (unlikely(!dev) || !dev->archdata.dma_ops) | |
33 | return dma_ops; | |
34 | else | |
35 | return dev->archdata.dma_ops; | |
36 | } | |
37 | ||
38 | #include <asm-generic/dma-mapping-common.h> | |
39 | ||
40 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) | |
41 | { | |
42 | return (dma_addr_t)paddr; | |
43 | } | |
44 | ||
45 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) | |
46 | { | |
47 | return (phys_addr_t)dev_addr; | |
48 | } | |
49 | ||
50 | static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr) | |
51 | { | |
52 | struct dma_map_ops *ops = get_dma_ops(dev); | |
bb7c4deb | 53 | debug_dma_mapping_error(dev, dev_addr); |
09b55412 CM |
54 | return ops->mapping_error(dev, dev_addr); |
55 | } | |
56 | ||
57 | static inline int dma_supported(struct device *dev, u64 mask) | |
58 | { | |
59 | struct dma_map_ops *ops = get_dma_ops(dev); | |
60 | return ops->dma_supported(dev, mask); | |
61 | } | |
62 | ||
63 | static inline int dma_set_mask(struct device *dev, u64 mask) | |
64 | { | |
65 | if (!dev->dma_mask || !dma_supported(dev, mask)) | |
66 | return -EIO; | |
67 | *dev->dma_mask = mask; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) | |
73 | { | |
74 | if (!dev->dma_mask) | |
75 | return 0; | |
76 | ||
77 | return addr + size - 1 <= *dev->dma_mask; | |
78 | } | |
79 | ||
80 | static inline void dma_mark_clean(void *addr, size_t size) | |
81 | { | |
82 | } | |
83 | ||
84 | static inline void *dma_alloc_coherent(struct device *dev, size_t size, | |
85 | dma_addr_t *dma_handle, gfp_t flags) | |
86 | { | |
87 | struct dma_map_ops *ops = get_dma_ops(dev); | |
88 | void *vaddr; | |
89 | ||
90 | if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr)) | |
91 | return vaddr; | |
92 | ||
93 | vaddr = ops->alloc(dev, size, dma_handle, flags, NULL); | |
94 | debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr); | |
95 | return vaddr; | |
96 | } | |
97 | ||
98 | static inline void dma_free_coherent(struct device *dev, size_t size, | |
99 | void *vaddr, dma_addr_t dev_addr) | |
100 | { | |
101 | struct dma_map_ops *ops = get_dma_ops(dev); | |
102 | ||
103 | if (dma_release_from_coherent(dev, get_order(size), vaddr)) | |
104 | return; | |
105 | ||
106 | debug_dma_free_coherent(dev, size, vaddr, dev_addr); | |
107 | ops->free(dev, size, vaddr, dev_addr, NULL); | |
108 | } | |
109 | ||
110 | /* | |
111 | * There is no dma_cache_sync() implementation, so just return NULL here. | |
112 | */ | |
113 | static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, | |
114 | dma_addr_t *handle, gfp_t flags) | |
115 | { | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | static inline void dma_free_noncoherent(struct device *dev, size_t size, | |
120 | void *cpu_addr, dma_addr_t handle) | |
121 | { | |
122 | } | |
123 | ||
124 | #endif /* __KERNEL__ */ | |
125 | #endif /* __ASM_DMA_MAPPING_H */ |