tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
28extern struct dma_map_ops *dma_ops;
29
30static 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
40static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
41{
42 return (dma_addr_t)paddr;
43}
44
45static 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
50static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
51{
52 struct dma_map_ops *ops = get_dma_ops(dev);
53 debug_dma_mapping_error(dev, dev_addr);
54 return ops->mapping_error(dev, dev_addr);
55}
56
57static 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
63static 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
72static 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
80static inline void dma_mark_clean(void *addr, size_t size)
81{
82}
83
84static 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
98static 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 */
113static 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
119static 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 */