Don't include linux/config.h from anywhere else in include/
[linux-2.6] / include / asm-sh / dma-mapping.h
1 #ifndef __ASM_SH_DMA_MAPPING_H
2 #define __ASM_SH_DMA_MAPPING_H
3
4 #include <linux/mm.h>
5 #include <asm/scatterlist.h>
6 #include <asm/cacheflush.h>
7 #include <asm/io.h>
8
9 extern struct bus_type pci_bus_type;
10
11 /* arch/sh/mm/consistent.c */
12 extern void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle);
13 extern void consistent_free(void *vaddr, size_t size);
14 extern void consistent_sync(void *vaddr, size_t size, int direction);
15
16 #define dma_supported(dev, mask)        (1)
17
18 static inline int dma_set_mask(struct device *dev, u64 mask)
19 {
20         if (!dev->dma_mask || !dma_supported(dev, mask))
21                 return -EIO;
22
23         *dev->dma_mask = mask;
24
25         return 0;
26 }
27
28 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
29                          dma_addr_t *dma_handle, gfp_t flag)
30 {
31         if (sh_mv.mv_consistent_alloc) {
32                 void *ret;
33
34                 ret = sh_mv.mv_consistent_alloc(dev, size, dma_handle, flag);
35                 if (ret != NULL)
36                         return ret;
37         }
38
39         return consistent_alloc(flag, size, dma_handle);
40 }
41
42 static inline void dma_free_coherent(struct device *dev, size_t size,
43                        void *vaddr, dma_addr_t dma_handle)
44 {
45         if (sh_mv.mv_consistent_free) {
46                 int ret;
47
48                 ret = sh_mv.mv_consistent_free(dev, size, vaddr, dma_handle);
49                 if (ret == 0)
50                         return;
51         }
52
53         consistent_free(vaddr, size);
54 }
55
56 static inline void dma_cache_sync(void *vaddr, size_t size,
57                                   enum dma_data_direction dir)
58 {
59         consistent_sync(vaddr, size, (int)dir);
60 }
61
62 static inline dma_addr_t dma_map_single(struct device *dev,
63                                         void *ptr, size_t size,
64                                         enum dma_data_direction dir)
65 {
66 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
67         if (dev->bus == &pci_bus_type)
68                 return virt_to_bus(ptr);
69 #endif
70         dma_cache_sync(ptr, size, dir);
71
72         return virt_to_bus(ptr);
73 }
74
75 #define dma_unmap_single(dev, addr, size, dir)  do { } while (0)
76
77 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
78                              int nents, enum dma_data_direction dir)
79 {
80         int i;
81
82         for (i = 0; i < nents; i++) {
83 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
84                 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
85                                sg[i].length, dir);
86 #endif
87                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
88         }
89
90         return nents;
91 }
92
93 #define dma_unmap_sg(dev, sg, nents, dir)       do { } while (0)
94
95 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
96                                       unsigned long offset, size_t size,
97                                       enum dma_data_direction dir)
98 {
99         return dma_map_single(dev, page_address(page) + offset, size, dir);
100 }
101
102 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
103                                   size_t size, enum dma_data_direction dir)
104 {
105         dma_unmap_single(dev, dma_address, size, dir);
106 }
107
108 static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
109                                    size_t size, enum dma_data_direction dir)
110 {
111 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
112         if (dev->bus == &pci_bus_type)
113                 return;
114 #endif
115         dma_cache_sync(bus_to_virt(dma_handle), size, dir);
116 }
117
118 static inline void dma_sync_single_range(struct device *dev,
119                                          dma_addr_t dma_handle,
120                                          unsigned long offset, size_t size,
121                                          enum dma_data_direction dir)
122 {
123 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
124         if (dev->bus == &pci_bus_type)
125                 return;
126 #endif
127         dma_cache_sync(bus_to_virt(dma_handle) + offset, size, dir);
128 }
129
130 static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
131                                int nelems, enum dma_data_direction dir)
132 {
133         int i;
134
135         for (i = 0; i < nelems; i++) {
136 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
137                 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
138                                sg[i].length, dir);
139 #endif
140                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
141         }
142 }
143
144 static void dma_sync_single_for_cpu(struct device *dev,
145                                     dma_addr_t dma_handle, size_t size,
146                                     enum dma_data_direction dir)
147         __attribute__ ((alias("dma_sync_single")));
148
149 static void dma_sync_single_for_device(struct device *dev,
150                                        dma_addr_t dma_handle, size_t size,
151                                        enum dma_data_direction dir)
152         __attribute__ ((alias("dma_sync_single")));
153
154 static void dma_sync_sg_for_cpu(struct device *dev,
155                                 struct scatterlist *sg, int nelems,
156                                 enum dma_data_direction dir)
157         __attribute__ ((alias("dma_sync_sg")));
158
159 static void dma_sync_sg_for_device(struct device *dev,
160                                    struct scatterlist *sg, int nelems,
161                                    enum dma_data_direction dir)
162         __attribute__ ((alias("dma_sync_sg")));
163
164 static inline int dma_get_cache_alignment(void)
165 {
166         /*
167          * Each processor family will define its own L1_CACHE_SHIFT,
168          * L1_CACHE_BYTES wraps to this, so this is always safe.
169          */
170         return L1_CACHE_BYTES;
171 }
172
173 static inline int dma_mapping_error(dma_addr_t dma_addr)
174 {
175         return dma_addr == 0;
176 }
177
178 #endif /* __ASM_SH_DMA_MAPPING_H */
179