Change table chaining layout
[linux-2.6.git] / include / asm-x86 / dma-mapping_32.h
1 #ifndef _ASM_I386_DMA_MAPPING_H
2 #define _ASM_I386_DMA_MAPPING_H
3
4 #include <linux/mm.h>
5 #include <linux/scatterlist.h>
6
7 #include <asm/cache.h>
8 #include <asm/io.h>
9 #include <asm/bug.h>
10
11 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
12 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
13
14 void *dma_alloc_coherent(struct device *dev, size_t size,
15                            dma_addr_t *dma_handle, gfp_t flag);
16
17 void dma_free_coherent(struct device *dev, size_t size,
18                          void *vaddr, dma_addr_t dma_handle);
19
20 static inline dma_addr_t
21 dma_map_single(struct device *dev, void *ptr, size_t size,
22                enum dma_data_direction direction)
23 {
24         BUG_ON(!valid_dma_direction(direction));
25         WARN_ON(size == 0);
26         flush_write_buffers();
27         return virt_to_phys(ptr);
28 }
29
30 static inline void
31 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
32                  enum dma_data_direction direction)
33 {
34         BUG_ON(!valid_dma_direction(direction));
35 }
36
37 static inline int
38 dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
39            enum dma_data_direction direction)
40 {
41         struct scatterlist *sg;
42         int i;
43
44         BUG_ON(!valid_dma_direction(direction));
45         WARN_ON(nents == 0 || sglist[0].length == 0);
46
47         for_each_sg(sglist, sg, nents, i) {
48                 BUG_ON(!sg_page(sg));
49
50                 sg->dma_address = sg_phys(sg);
51         }
52
53         flush_write_buffers();
54         return nents;
55 }
56
57 static inline dma_addr_t
58 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
59              size_t size, enum dma_data_direction direction)
60 {
61         BUG_ON(!valid_dma_direction(direction));
62         return page_to_phys(page) + offset;
63 }
64
65 static inline void
66 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
67                enum dma_data_direction direction)
68 {
69         BUG_ON(!valid_dma_direction(direction));
70 }
71
72
73 static inline void
74 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
75              enum dma_data_direction direction)
76 {
77         BUG_ON(!valid_dma_direction(direction));
78 }
79
80 static inline void
81 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
82                         enum dma_data_direction direction)
83 {
84 }
85
86 static inline void
87 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
88                         enum dma_data_direction direction)
89 {
90         flush_write_buffers();
91 }
92
93 static inline void
94 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
95                               unsigned long offset, size_t size,
96                               enum dma_data_direction direction)
97 {
98 }
99
100 static inline void
101 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
102                                  unsigned long offset, size_t size,
103                                  enum dma_data_direction direction)
104 {
105         flush_write_buffers();
106 }
107
108 static inline void
109 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
110                     enum dma_data_direction direction)
111 {
112 }
113
114 static inline void
115 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
116                     enum dma_data_direction direction)
117 {
118         flush_write_buffers();
119 }
120
121 static inline int
122 dma_mapping_error(dma_addr_t dma_addr)
123 {
124         return 0;
125 }
126
127 extern int forbid_dac;
128
129 static inline int
130 dma_supported(struct device *dev, u64 mask)
131 {
132         /*
133          * we fall back to GFP_DMA when the mask isn't all 1s,
134          * so we can't guarantee allocations that must be
135          * within a tighter range than GFP_DMA..
136          */
137         if(mask < 0x00ffffff)
138                 return 0;
139
140         /* Work around chipset bugs */
141         if (forbid_dac > 0 && mask > 0xffffffffULL)
142                 return 0;
143
144         return 1;
145 }
146
147 static inline int
148 dma_set_mask(struct device *dev, u64 mask)
149 {
150         if(!dev->dma_mask || !dma_supported(dev, mask))
151                 return -EIO;
152
153         *dev->dma_mask = mask;
154
155         return 0;
156 }
157
158 static inline int
159 dma_get_cache_alignment(void)
160 {
161         /* no easy way to get cache size on all x86, so return the
162          * maximum possible, to be safe */
163         return (1 << INTERNODE_CACHE_SHIFT);
164 }
165
166 #define dma_is_consistent(d, h) (1)
167
168 static inline void
169 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
170                enum dma_data_direction direction)
171 {
172         flush_write_buffers();
173 }
174
175 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
176 extern int
177 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
178                             dma_addr_t device_addr, size_t size, int flags);
179
180 extern void
181 dma_release_declared_memory(struct device *dev);
182
183 extern void *
184 dma_mark_declared_memory_occupied(struct device *dev,
185                                   dma_addr_t device_addr, size_t size);
186
187 #endif