c2ddd3d1b8831a98fe139639e131f458bfc41d99
[linux-2.6.git] / include / asm-x86 / dma-mapping.h
1 #ifndef _ASM_DMA_MAPPING_H_
2 #define _ASM_DMA_MAPPING_H_
3
4 /*
5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
6  * documentation.
7  */
8
9 #include <linux/scatterlist.h>
10 #include <asm/io.h>
11 #include <asm/swiotlb.h>
12
13 extern dma_addr_t bad_dma_address;
14 extern int iommu_merge;
15 extern struct device fallback_dev;
16 extern int panic_on_overflow;
17 extern int force_iommu;
18
19 struct dma_mapping_ops {
20         int             (*mapping_error)(dma_addr_t dma_addr);
21         void*           (*alloc_coherent)(struct device *dev, size_t size,
22                                 dma_addr_t *dma_handle, gfp_t gfp);
23         void            (*free_coherent)(struct device *dev, size_t size,
24                                 void *vaddr, dma_addr_t dma_handle);
25         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
26                                 size_t size, int direction);
27         /* like map_single, but doesn't check the device mask */
28         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
29                                 size_t size, int direction);
30         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
31                                 size_t size, int direction);
32         void            (*sync_single_for_cpu)(struct device *hwdev,
33                                 dma_addr_t dma_handle, size_t size,
34                                 int direction);
35         void            (*sync_single_for_device)(struct device *hwdev,
36                                 dma_addr_t dma_handle, size_t size,
37                                 int direction);
38         void            (*sync_single_range_for_cpu)(struct device *hwdev,
39                                 dma_addr_t dma_handle, unsigned long offset,
40                                 size_t size, int direction);
41         void            (*sync_single_range_for_device)(struct device *hwdev,
42                                 dma_addr_t dma_handle, unsigned long offset,
43                                 size_t size, int direction);
44         void            (*sync_sg_for_cpu)(struct device *hwdev,
45                                 struct scatterlist *sg, int nelems,
46                                 int direction);
47         void            (*sync_sg_for_device)(struct device *hwdev,
48                                 struct scatterlist *sg, int nelems,
49                                 int direction);
50         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
51                                 int nents, int direction);
52         void            (*unmap_sg)(struct device *hwdev,
53                                 struct scatterlist *sg, int nents,
54                                 int direction);
55         int             (*dma_supported)(struct device *hwdev, u64 mask);
56         int             is_phys;
57 };
58
59 extern const struct dma_mapping_ops *dma_ops;
60
61 static inline int dma_mapping_error(dma_addr_t dma_addr)
62 {
63         if (dma_ops->mapping_error)
64                 return dma_ops->mapping_error(dma_addr);
65
66         return (dma_addr == bad_dma_address);
67 }
68
69 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
70 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
71
72 void *dma_alloc_coherent(struct device *dev, size_t size,
73                            dma_addr_t *dma_handle, gfp_t flag);
74
75 void dma_free_coherent(struct device *dev, size_t size,
76                          void *vaddr, dma_addr_t dma_handle);
77
78
79 extern int dma_supported(struct device *hwdev, u64 mask);
80 extern int dma_set_mask(struct device *dev, u64 mask);
81
82 static inline dma_addr_t
83 dma_map_single(struct device *hwdev, void *ptr, size_t size,
84                int direction)
85 {
86         BUG_ON(!valid_dma_direction(direction));
87         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
88 }
89
90 static inline void
91 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
92                  int direction)
93 {
94         BUG_ON(!valid_dma_direction(direction));
95         if (dma_ops->unmap_single)
96                 dma_ops->unmap_single(dev, addr, size, direction);
97 }
98
99 static inline int
100 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
101            int nents, int direction)
102 {
103         BUG_ON(!valid_dma_direction(direction));
104         return dma_ops->map_sg(hwdev, sg, nents, direction);
105 }
106
107 static inline void
108 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
109              int direction)
110 {
111         BUG_ON(!valid_dma_direction(direction));
112         if (dma_ops->unmap_sg)
113                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
114 }
115
116 static inline void
117 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
118                         size_t size, int direction)
119 {
120         BUG_ON(!valid_dma_direction(direction));
121         if (dma_ops->sync_single_for_cpu)
122                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
123                                              direction);
124         flush_write_buffers();
125 }
126
127 static inline void
128 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
129                            size_t size, int direction)
130 {
131         BUG_ON(!valid_dma_direction(direction));
132         if (dma_ops->sync_single_for_device)
133                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
134                                                 direction);
135         flush_write_buffers();
136 }
137
138 static inline void
139 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
140                               unsigned long offset, size_t size, int direction)
141 {
142         BUG_ON(!valid_dma_direction(direction));
143         if (dma_ops->sync_single_range_for_cpu)
144                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
145                                                    size, direction);
146
147         flush_write_buffers();
148 }
149
150 static inline void
151 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
152                                  unsigned long offset, size_t size,
153                                  int direction)
154 {
155         BUG_ON(!valid_dma_direction(direction));
156         if (dma_ops->sync_single_range_for_device)
157                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
158                                                       offset, size, direction);
159
160         flush_write_buffers();
161 }
162
163 static inline void
164 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
165                     int nelems, int direction)
166 {
167         BUG_ON(!valid_dma_direction(direction));
168         if (dma_ops->sync_sg_for_cpu)
169                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
170         flush_write_buffers();
171 }
172
173 static inline void
174 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
175                        int nelems, int direction)
176 {
177         BUG_ON(!valid_dma_direction(direction));
178         if (dma_ops->sync_sg_for_device)
179                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
180
181         flush_write_buffers();
182 }
183
184 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
185                                       size_t offset, size_t size,
186                                       int direction)
187 {
188         BUG_ON(!valid_dma_direction(direction));
189         return dma_ops->map_single(dev, page_to_phys(page)+offset,
190                                    size, direction);
191 }
192
193 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
194                                   size_t size, int direction)
195 {
196         dma_unmap_single(dev, addr, size, direction);
197 }
198
199 static inline void
200 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
201         enum dma_data_direction dir)
202 {
203         flush_write_buffers();
204 }
205
206 static inline int dma_get_cache_alignment(void)
207 {
208         /* no easy way to get cache size on all x86, so return the
209          * maximum possible, to be safe */
210         return boot_cpu_data.x86_clflush_size;
211 }
212
213 #define dma_is_consistent(d, h) (1)
214
215 #ifdef CONFIG_X86_32
216 #  define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
217 struct dma_coherent_mem {
218         void            *virt_base;
219         u32             device_base;
220         int             size;
221         int             flags;
222         unsigned long   *bitmap;
223 };
224
225 extern int
226 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
227                             dma_addr_t device_addr, size_t size, int flags);
228
229 extern void
230 dma_release_declared_memory(struct device *dev);
231
232 extern void *
233 dma_mark_declared_memory_occupied(struct device *dev,
234                                   dma_addr_t device_addr, size_t size);
235 #endif /* CONFIG_X86_32 */
236 #endif