include/asm-generic/dma-mapping.h

   1 /* Copyright (C) 2002 by James.Bottomley@HansenPartnership.com
   2  *
   3  * Implements the generic device dma API via the existing pci_ one
   4  * for unconverted architectures
   5  */
   6
   7 #ifndef _ASM_GENERIC_DMA_MAPPING_H
   8 #define _ASM_GENERIC_DMA_MAPPING_H
   9
  10
  11 #ifdef CONFIG_PCI
  12
  13 /* we implement the API below in terms of the existing PCI one,
  14  * so include it */
  15 #include <linux/pci.h>
  16 /* need struct page definitions */
  17 #include <linux/mm.h>
  18
  19 static inline int
  20 dma_supported(struct device *dev, u64 mask)
  21 {
  22         BUG_ON(dev->bus != &pci_bus_type);
  23
  24         return pci_dma_supported(to_pci_dev(dev), mask);
  25 }
  26
  27 static inline int
  28 dma_set_mask(struct device *dev, u64 dma_mask)
  29 {
  30         BUG_ON(dev->bus != &pci_bus_type);
  31
  32         return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
  33 }
  34
  35 static inline void *
  36 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  37                    gfp_t flag)
  38 {
  39         BUG_ON(dev->bus != &pci_bus_type);
  40
  41         return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
  42 }
  43
  44 static inline void
  45 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
  46                     dma_addr_t dma_handle)
  47 {
  48         BUG_ON(dev->bus != &pci_bus_type);
  49
  50         pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
  51 }
  52
  53 static inline dma_addr_t
  54 dma_map_single(struct device *dev, void *cpu_addr, size_t size,
  55                enum dma_data_direction direction)
  56 {
  57         BUG_ON(dev->bus != &pci_bus_type);
  58
  59         return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
  60 }
  61
  62 static inline void
  63 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  64                  enum dma_data_direction direction)
  65 {
  66         BUG_ON(dev->bus != &pci_bus_type);
  67
  68         pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
  69 }
  70
  71 static inline dma_addr_t
  72 dma_map_page(struct device *dev, struct page *page,
  73              unsigned long offset, size_t size,
  74              enum dma_data_direction direction)
  75 {
  76         BUG_ON(dev->bus != &pci_bus_type);
  77
  78         return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
  79 }
  80
  81 static inline void
  82 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  83                enum dma_data_direction direction)
  84 {
  85         BUG_ON(dev->bus != &pci_bus_type);
  86
  87         pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
  88 }
  89
  90 static inline int
  91 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  92            enum dma_data_direction direction)
  93 {
  94         BUG_ON(dev->bus != &pci_bus_type);
  95
  96         return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
  97 }
  98
  99 static inline void
 100 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 101              enum dma_data_direction direction)
 102 {
 103         BUG_ON(dev->bus != &pci_bus_type);
 104
 105         pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
 106 }
 107
 108 static inline void
 109 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 110                         enum dma_data_direction direction)
 111 {
 112         BUG_ON(dev->bus != &pci_bus_type);
 113
 114         pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
 115                                     size, (int)direction);
 116 }
 117
 118 static inline void
 119 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 120                            enum dma_data_direction direction)
 121 {
 122         BUG_ON(dev->bus != &pci_bus_type);
 123
 124         pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
 125                                        size, (int)direction);
 126 }
 127
 128 static inline void
 129 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 130                     enum dma_data_direction direction)
 131 {
 132         BUG_ON(dev->bus != &pci_bus_type);
 133
 134         pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg, nelems, (int)direction);
 135 }
 136
 137 static inline void
 138 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 139                        enum dma_data_direction direction)
 140 {
 141         BUG_ON(dev->bus != &pci_bus_type);
 142
 143         pci_dma_sync_sg_for_device(to_pci_dev(dev), sg, nelems, (int)direction);
 144 }
 145
 146 static inline int
 147 dma_mapping_error(dma_addr_t dma_addr)
 148 {
 149         return pci_dma_mapping_error(dma_addr);
 150 }
 151
 152
 153 #else
 154
 155 static inline int
 156 dma_supported(struct device *dev, u64 mask)
 157 {
 158         return 0;
 159 }
 160
 161 static inline int
 162 dma_set_mask(struct device *dev, u64 dma_mask)
 163 {
 164         BUG();
 165         return 0;
 166 }
 167
 168 static inline void *
 169 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 170                    gfp_t flag)
 171 {
 172         BUG();
 173         return NULL;
 174 }
 175
 176 static inline void
 177 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
 178                     dma_addr_t dma_handle)
 179 {
 180         BUG();
 181 }
 182
 183 static inline dma_addr_t
 184 dma_map_single(struct device *dev, void *cpu_addr, size_t size,
 185                enum dma_data_direction direction)
 186 {
 187         BUG();
 188         return 0;
 189 }
 190
 191 static inline void
 192 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 193                  enum dma_data_direction direction)
 194 {
 195         BUG();
 196 }
 197
 198 static inline dma_addr_t
 199 dma_map_page(struct device *dev, struct page *page,
 200              unsigned long offset, size_t size,
 201              enum dma_data_direction direction)
 202 {
 203         BUG();
 204         return 0;
 205 }
 206
 207 static inline void
 208 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 209                enum dma_data_direction direction)
 210 {
 211         BUG();
 212 }
 213
 214 static inline int
 215 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 216            enum dma_data_direction direction)
 217 {
 218         BUG();
 219         return 0;
 220 }
 221
 222 static inline void
 223 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 224              enum dma_data_direction direction)
 225 {
 226         BUG();
 227 }
 228
 229 static inline void
 230 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 231                         enum dma_data_direction direction)
 232 {
 233         BUG();
 234 }
 235
 236 static inline void
 237 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 238                            enum dma_data_direction direction)
 239 {
 240         BUG();
 241 }
 242
 243 static inline void
 244 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 245                     enum dma_data_direction direction)
 246 {
 247         BUG();
 248 }
 249
 250 static inline void
 251 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 252                        enum dma_data_direction direction)
 253 {
 254         BUG();
 255 }
 256
 257 static inline int
 258 dma_error(dma_addr_t dma_addr)
 259 {
 260         return 0;
 261 }
 262
 263 #endif
 264
 265 /* Now for the API extensions over the pci_ one */
 266
 267 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 268 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 269 #define dma_is_consistent(d)    (1)
 270
 271 static inline int
 272 dma_get_cache_alignment(void)
 273 {
 274         /* no easy way to get cache size on all processors, so return
 275          * the maximum possible, to be safe */
 276         return (1 << INTERNODE_CACHE_SHIFT);
 277 }
 278
 279 static inline void
 280 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 281                               unsigned long offset, size_t size,
 282                               enum dma_data_direction direction)
 283 {
 284         /* just sync everything, that's all the pci API can do */
 285         dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction);
 286 }
 287
 288 static inline void
 289 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 290                                  unsigned long offset, size_t size,
 291                                  enum dma_data_direction direction)
 292 {
 293         /* just sync everything, that's all the pci API can do */
 294         dma_sync_single_for_device(dev, dma_handle, offset+size, direction);
 295 }
 296
 297 static inline void
 298 dma_cache_sync(void *vaddr, size_t size,
 299                enum dma_data_direction direction)
 300 {
 301         /* could define this in terms of the dma_cache ... operations,
 302          * but if you get this on a platform, you should convert the platform
 303          * to using the generic device DMA API */
 304         BUG();
 305 }
 306
 307 #endif
 308