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[linux-3.10.git] / include / asm-sh / dma-mapping.h
1 #ifndef __ASM_SH_DMA_MAPPING_H
2 #define __ASM_SH_DMA_MAPPING_H
3
4 #include <linux/config.h>
5 #include <linux/mm.h>
6 #include <asm/scatterlist.h>
7 #include <asm/cacheflush.h>
8 #include <asm/io.h>
9
10 extern struct bus_type pci_bus_type;
11
12 /* arch/sh/mm/consistent.c */
13 extern void *consistent_alloc(gfp_t gfp, size_t size, dma_addr_t *handle);
14 extern void consistent_free(void *vaddr, size_t size);
15 extern void consistent_sync(void *vaddr, size_t size, int direction);
16
17 #define dma_supported(dev, mask)        (1)
18
19 static inline int dma_set_mask(struct device *dev, u64 mask)
20 {
21         if (!dev->dma_mask || !dma_supported(dev, mask))
22                 return -EIO;
23
24         *dev->dma_mask = mask;
25
26         return 0;
27 }
28
29 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
30                          dma_addr_t *dma_handle, gfp_t flag)
31 {
32         if (sh_mv.mv_consistent_alloc) {
33                 void *ret;
34
35                 ret = sh_mv.mv_consistent_alloc(dev, size, dma_handle, flag);
36                 if (ret != NULL)
37                         return ret;
38         }
39
40         return consistent_alloc(flag, size, dma_handle);
41 }
42
43 static inline void dma_free_coherent(struct device *dev, size_t size,
44                        void *vaddr, dma_addr_t dma_handle)
45 {
46         if (sh_mv.mv_consistent_free) {
47                 int ret;
48
49                 ret = sh_mv.mv_consistent_free(dev, size, vaddr, dma_handle);
50                 if (ret == 0)
51                         return;
52         }
53
54         consistent_free(vaddr, size);
55 }
56
57 static inline void dma_cache_sync(void *vaddr, size_t size,
58                                   enum dma_data_direction dir)
59 {
60         consistent_sync(vaddr, size, (int)dir);
61 }
62
63 static inline dma_addr_t dma_map_single(struct device *dev,
64                                         void *ptr, size_t size,
65                                         enum dma_data_direction dir)
66 {
67 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
68         if (dev->bus == &pci_bus_type)
69                 return virt_to_bus(ptr);
70 #endif
71         dma_cache_sync(ptr, size, dir);
72
73         return virt_to_bus(ptr);
74 }
75
76 #define dma_unmap_single(dev, addr, size, dir)  do { } while (0)
77
78 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
79                              int nents, enum dma_data_direction dir)
80 {
81         int i;
82
83         for (i = 0; i < nents; i++) {
84 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
85                 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
86                                sg[i].length, dir);
87 #endif
88                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
89         }
90
91         return nents;
92 }
93
94 #define dma_unmap_sg(dev, sg, nents, dir)       do { } while (0)
95
96 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
97                                       unsigned long offset, size_t size,
98                                       enum dma_data_direction dir)
99 {
100         return dma_map_single(dev, page_address(page) + offset, size, dir);
101 }
102
103 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
104                                   size_t size, enum dma_data_direction dir)
105 {
106         dma_unmap_single(dev, dma_address, size, dir);
107 }
108
109 static inline void dma_sync_single(struct device *dev, dma_addr_t dma_handle,
110                                    size_t size, enum dma_data_direction dir)
111 {
112 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
113         if (dev->bus == &pci_bus_type)
114                 return;
115 #endif
116         dma_cache_sync(bus_to_virt(dma_handle), size, dir);
117 }
118
119 static inline void dma_sync_single_range(struct device *dev,
120                                          dma_addr_t dma_handle,
121                                          unsigned long offset, size_t size,
122                                          enum dma_data_direction dir)
123 {
124 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
125         if (dev->bus == &pci_bus_type)
126                 return;
127 #endif
128         dma_cache_sync(bus_to_virt(dma_handle) + offset, size, dir);
129 }
130
131 static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
132                                int nelems, enum dma_data_direction dir)
133 {
134         int i;
135
136         for (i = 0; i < nelems; i++) {
137 #if !defined(CONFIG_PCI) || defined(CONFIG_SH_PCIDMA_NONCOHERENT)
138                 dma_cache_sync(page_address(sg[i].page) + sg[i].offset,
139                                sg[i].length, dir);
140 #endif
141                 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
142         }
143 }
144
145 static void dma_sync_single_for_cpu(struct device *dev,
146                                     dma_addr_t dma_handle, size_t size,
147                                     enum dma_data_direction dir)
148         __attribute__ ((alias("dma_sync_single")));
149
150 static void dma_sync_single_for_device(struct device *dev,
151                                        dma_addr_t dma_handle, size_t size,
152                                        enum dma_data_direction dir)
153         __attribute__ ((alias("dma_sync_single")));
154
155 static void dma_sync_sg_for_cpu(struct device *dev,
156                                 struct scatterlist *sg, int nelems,
157                                 enum dma_data_direction dir)
158         __attribute__ ((alias("dma_sync_sg")));
159
160 static void dma_sync_sg_for_device(struct device *dev,
161                                    struct scatterlist *sg, int nelems,
162                                    enum dma_data_direction dir)
163         __attribute__ ((alias("dma_sync_sg")));
164
165 static inline int dma_get_cache_alignment(void)
166 {
167         /*
168          * Each processor family will define its own L1_CACHE_SHIFT,
169          * L1_CACHE_BYTES wraps to this, so this is always safe.
170          */
171         return L1_CACHE_BYTES;
172 }
173
174 static inline int dma_mapping_error(dma_addr_t dma_addr)
175 {
176         return dma_addr == 0;
177 }
178
179 #endif /* __ASM_SH_DMA_MAPPING_H */
180