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dma-mapping.h
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1 /*
2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation, version 2.
7  *
8  * This program is distributed in the hope that it will be useful, but
9  * WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11  * NON INFRINGEMENT. See the GNU General Public License for
12  * more details.
13  */
14 
15 #ifndef _ASM_TILE_DMA_MAPPING_H
16 #define _ASM_TILE_DMA_MAPPING_H
17 
18 #include <linux/mm.h>
19 #include <linux/scatterlist.h>
20 #include <linux/cache.h>
21 #include <linux/io.h>
22 
23 extern struct dma_map_ops *tile_dma_map_ops;
24 extern struct dma_map_ops *gx_pci_dma_map_ops;
26 
27 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
28 {
29  if (dev && dev->archdata.dma_ops)
30  return dev->archdata.dma_ops;
31  else
32  return tile_dma_map_ops;
33 }
34 
35 static inline dma_addr_t get_dma_offset(struct device *dev)
36 {
37  return dev->archdata.dma_offset;
38 }
39 
40 static inline void set_dma_offset(struct device *dev, dma_addr_t off)
41 {
42  dev->archdata.dma_offset = off;
43 }
44 
45 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
46 {
47  return paddr + get_dma_offset(dev);
48 }
49 
50 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
51 {
52  return daddr - get_dma_offset(dev);
53 }
54 
55 static inline void dma_mark_clean(void *addr, size_t size) {}
56 
58 
59 static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
60 {
61  dev->archdata.dma_ops = ops;
62 }
63 
64 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
65 {
66  if (!dev->dma_mask)
67  return 0;
68 
69  return addr + size - 1 <= *dev->dma_mask;
70 }
71 
72 static inline int
74 {
75  return get_dma_ops(dev)->mapping_error(dev, dma_addr);
76 }
77 
78 static inline int
79 dma_supported(struct device *dev, u64 mask)
80 {
81  return get_dma_ops(dev)->dma_supported(dev, mask);
82 }
83 
84 static inline int
85 dma_set_mask(struct device *dev, u64 mask)
86 {
87  struct dma_map_ops *dma_ops = get_dma_ops(dev);
88 
89  /* Handle legacy PCI devices with limited memory addressability. */
90  if ((dma_ops == gx_pci_dma_map_ops) && (mask <= DMA_BIT_MASK(32))) {
91  set_dma_ops(dev, gx_legacy_pci_dma_map_ops);
92  set_dma_offset(dev, 0);
93  if (mask > dev->archdata.max_direct_dma_addr)
94  mask = dev->archdata.max_direct_dma_addr;
95  }
96 
97  if (!dev->dma_mask || !dma_supported(dev, mask))
98  return -EIO;
99 
100  *dev->dma_mask = mask;
101 
102  return 0;
103 }
104 
105 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
107  struct dma_attrs *attrs)
108 {
109  struct dma_map_ops *dma_ops = get_dma_ops(dev);
110  void *cpu_addr;
111 
112  cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
113 
114  debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
115 
116  return cpu_addr;
117 }
118 
119 static inline void dma_free_attrs(struct device *dev, size_t size,
120  void *cpu_addr, dma_addr_t dma_handle,
121  struct dma_attrs *attrs)
122 {
123  struct dma_map_ops *dma_ops = get_dma_ops(dev);
124 
125  debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
126 
127  dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
128 }
129 
130 #define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
131 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
132 #define dma_free_coherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
133 #define dma_free_noncoherent(d, s, v, h) dma_free_attrs(d, s, v, h, NULL)
134 
135 /*
136  * dma_alloc_noncoherent() is #defined to return coherent memory,
137  * so there's no need to do any flushing here.
138  */
139 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
141 {
142 }
143 
144 #endif /* _ASM_TILE_DMA_MAPPING_H */