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 #include <linux/config.h>
  11
  12 #ifdef CONFIG_PCI
  13
  14 /* we implement the API below in terms of the existing PCI one,
  15  * so include it */
  16 #include <linux/pci.h>
  17 /* need struct page definitions */
  18 #include <linux/mm.h>
  19
  20 static inline int
  21 dma_supported(struct device *dev, u64 mask)
  22 {
  23         BUG_ON(dev->bus != &pci_bus_type);
  24
  25         return pci_dma_supported(to_pci_dev(dev), mask);
  26 }
  27
  28 static inline int
  29 dma_set_mask(struct device *dev, u64 dma_mask)
  30 {
  31         BUG_ON(dev->bus != &pci_bus_type);
  32
  33         return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
  34 }
  35
  36 static inline void *
  37 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  38                    gfp_t flag)
  39 {
  40         BUG_ON(dev->bus != &pci_bus_type);
  41
  42         return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
  43 }
  44
  45 static inline void
  46 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
  47                     dma_addr_t dma_handle)
  48 {
  49         BUG_ON(dev->bus != &pci_bus_type);
  50
  51         pci_free_consistent(to_pci_dev(dev), size, cpu_addr, dma_handle);
  52 }
  53
  54 static inline dma_addr_t
  55 dma_map_single(struct device *dev, void *cpu_addr, size_t size,
  56                enum dma_data_direction direction)
  57 {
  58         BUG_ON(dev->bus != &pci_bus_type);
  59
  60         return pci_map_single(to_pci_dev(dev), cpu_addr, size, (int)direction);
  61 }
  62
  63 static inline void
  64 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  65                  enum dma_data_direction direction)
  66 {
  67         BUG_ON(dev->bus != &pci_bus_type);
  68
  69         pci_unmap_single(to_pci_dev(dev), dma_addr, size, (int)direction);
  70 }
  71
  72 static inline dma_addr_t
  73 dma_map_page(struct device *dev, struct page *page,
  74              unsigned long offset, size_t size,
  75              enum dma_data_direction direction)
  76 {
  77         BUG_ON(dev->bus != &pci_bus_type);
  78
  79         return pci_map_page(to_pci_dev(dev), page, offset, size, (int)direction);
  80 }
  81
  82 static inline void
  83 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  84                enum dma_data_direction direction)
  85 {
  86         BUG_ON(dev->bus != &pci_bus_type);
  87
  88         pci_unmap_page(to_pci_dev(dev), dma_address, size, (int)direction);
  89 }
  90
  91 static inline int
  92 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  93            enum dma_data_direction direction)
  94 {
  95         BUG_ON(dev->bus != &pci_bus_type);
  96
  97         return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
  98 }
  99
 100 static inline void
 101 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 102              enum dma_data_direction direction)
 103 {
 104         BUG_ON(dev->bus != &pci_bus_type);
 105
 106         pci_unmap_sg(to_pci_dev(dev), sg, nhwentries, (int)direction);
 107 }
 108
 109 static inline void
 110 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 111                         enum dma_data_direction direction)
 112 {
 113         BUG_ON(dev->bus != &pci_bus_type);
 114
 115         pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
 116                                     size, (int)direction);
 117 }
 118
 119 static inline void
 120 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 121                            enum dma_data_direction direction)
 122 {
 123         BUG_ON(dev->bus != &pci_bus_type);
 124
 125         pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
 126                                        size, (int)direction);
 127 }
 128
 129 static inline void
 130 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 131                     enum dma_data_direction direction)
 132 {
 133         BUG_ON(dev->bus != &pci_bus_type);
 134
 135         pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg, nelems, (int)direction);
 136 }
 137
 138 static inline void
 139 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 140                        enum dma_data_direction direction)
 141 {
 142         BUG_ON(dev->bus != &pci_bus_type);
 143
 144         pci_dma_sync_sg_for_device(to_pci_dev(dev), sg, nelems, (int)direction);
 145 }
 146
 147 static inline int
 148 dma_mapping_error(dma_addr_t dma_addr)
 149 {
 150         return pci_dma_mapping_error(dma_addr);
 151 }
 152
 153
 154 #else
 155
 156 static inline int
 157 dma_supported(struct device *dev, u64 mask)
 158 {
 159         return 0;
 160 }
 161
 162 static inline int
 163 dma_set_mask(struct device *dev, u64 dma_mask)
 164 {
 165         BUG();
 166         return 0;
 167 }
 168
 169 static inline void *
 170 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 171                    gfp_t flag)
 172 {
 173         BUG();
 174         return NULL;
 175 }
 176
 177 static inline void
 178 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
 179                     dma_addr_t dma_handle)
 180 {
 181         BUG();
 182 }
 183
 184 static inline dma_addr_t
 185 dma_map_single(struct device *dev, void *cpu_addr, size_t size,
 186                enum dma_data_direction direction)
 187 {
 188         BUG();
 189         return 0;
 190 }
 191
 192 static inline void
 193 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 194                  enum dma_data_direction direction)
 195 {
 196         BUG();
 197 }
 198
 199 static inline dma_addr_t
 200 dma_map_page(struct device *dev, struct page *page,
 201              unsigned long offset, size_t size,
 202              enum dma_data_direction direction)
 203 {
 204         BUG();
 205         return 0;
 206 }
 207
 208 static inline void
 209 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 210                enum dma_data_direction direction)
 211 {
 212         BUG();
 213 }
 214
 215 static inline int
 216 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 217            enum dma_data_direction direction)
 218 {
 219         BUG();
 220         return 0;
 221 }
 222
 223 static inline void
 224 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 225              enum dma_data_direction direction)
 226 {
 227         BUG();
 228 }
 229
 230 static inline void
 231 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 232                         enum dma_data_direction direction)
 233 {
 234         BUG();
 235 }
 236
 237 static inline void
 238 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 239                            enum dma_data_direction direction)
 240 {
 241         BUG();
 242 }
 243
 244 static inline void
 245 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 246                     enum dma_data_direction direction)
 247 {
 248         BUG();
 249 }
 250
 251 static inline void
 252 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 253                        enum dma_data_direction direction)
 254 {
 255         BUG();
 256 }
 257
 258 static inline int
 259 dma_error(dma_addr_t dma_addr)
 260 {
 261         return 0;
 262 }
 263
 264 #endif
 265
 266 /* Now for the API extensions over the pci_ one */
 267
 268 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 269 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 270 #define dma_is_consistent(d)    (1)
 271
 272 static inline int
 273 dma_get_cache_alignment(void)
 274 {
 275         /* no easy way to get cache size on all processors, so return
 276          * the maximum possible, to be safe */
 277         return (1 << L1_CACHE_SHIFT_MAX);
 278 }
 279
 280 static inline void
 281 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 282                               unsigned long offset, size_t size,
 283                               enum dma_data_direction direction)
 284 {
 285         /* just sync everything, that's all the pci API can do */
 286         dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction);
 287 }
 288
 289 static inline void
 290 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 291                                  unsigned long offset, size_t size,
 292                                  enum dma_data_direction direction)
 293 {
 294         /* just sync everything, that's all the pci API can do */
 295         dma_sync_single_for_device(dev, dma_handle, offset+size, direction);
 296 }
 297
 298 static inline void
 299 dma_cache_sync(void *vaddr, size_t size,
 300                enum dma_data_direction direction)
 301 {
 302         /* could define this in terms of the dma_cache ... operations,
 303          * but if you get this on a platform, you should convert the platform
 304          * to using the generic device DMA API */
 305         BUG();
 306 }
 307
 308 #endif
 309