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dma-mapping.h
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1 /*
2  * OpenRISC Linux
3  *
4  * Linux architectural port borrowing liberally from similar works of
5  * others. All original copyrights apply as per the original source
6  * declaration.
7  *
8  * OpenRISC implementation:
9  * Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  */
16 
17 #ifndef __ASM_OPENRISC_DMA_MAPPING_H
18 #define __ASM_OPENRISC_DMA_MAPPING_H
19 
20 /*
21  * See Documentation/DMA-API-HOWTO.txt and
22  * Documentation/DMA-API.txt for documentation.
23  */
24 
25 #include <linux/dma-debug.h>
27 #include <linux/kmemcheck.h>
28 #include <linux/dma-mapping.h>
29 
30 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
31 
32 extern struct dma_map_ops or1k_dma_map_ops;
33 
34 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
35 {
36  return &or1k_dma_map_ops;
37 }
38 
40 
41 #define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL)
42 
43 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
45  struct dma_attrs *attrs)
46 {
47  struct dma_map_ops *ops = get_dma_ops(dev);
48  void *memory;
49 
50  memory = ops->alloc(dev, size, dma_handle, gfp, attrs);
51 
52  debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
53 
54  return memory;
55 }
56 
57 #define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
58 
59 static inline void dma_free_attrs(struct device *dev, size_t size,
61  struct dma_attrs *attrs)
62 {
63  struct dma_map_ops *ops = get_dma_ops(dev);
64 
65  debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
66 
67  ops->free(dev, size, cpu_addr, dma_handle, attrs);
68 }
69 
70 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
72 {
73  struct dma_attrs attrs;
74 
75  dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
76 
77  return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
78 }
79 
80 static inline void dma_free_noncoherent(struct device *dev, size_t size,
82 {
83  struct dma_attrs attrs;
84 
85  dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
86 
87  dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
88 }
89 
90 static inline int dma_supported(struct device *dev, u64 dma_mask)
91 {
92  /* Support 32 bit DMA mask exclusively */
93  return dma_mask == DMA_BIT_MASK(32);
94 }
95 
96 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
97 {
98  return 0;
99 }
100 
101 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
102 {
103  if (!dev->dma_mask || !dma_supported(dev, dma_mask))
104  return -EIO;
105 
106  *dev->dma_mask = dma_mask;
107 
108  return 0;
109 }
110 #endif /* __ASM_OPENRISC_DMA_MAPPING_H */