lib/devres.c

   1 #include <linux/err.h>
   2 #include <linux/pci.h>
   3 #include <linux/io.h>
   4 #include <linux/gfp.h>
   5 #include <linux/export.h>
   6
   7 void devm_ioremap_release(struct device *dev, void *res)
   8 {
   9         iounmap(*(void __iomem **)res);
  10 }
  11
  12 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  13 {
  14         return *(void **)res == match_data;
  15 }
  16
  17 /**
  18  * devm_ioremap - Managed ioremap()
  19  * @dev: Generic device to remap IO address for
  20  * @offset: BUS offset to map
  21  * @size: Size of map
  22  *
  23  * Managed ioremap().  Map is automatically unmapped on driver detach.
  24  */
  25 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  26                            resource_size_t size)
  27 {
  28         void __iomem **ptr, *addr;
  29
  30         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  31         if (!ptr)
  32                 return NULL;
  33
  34         addr = ioremap(offset, size);
  35         if (addr) {
  36                 *ptr = addr;
  37                 devres_add(dev, ptr);
  38         } else
  39                 devres_free(ptr);
  40
  41         return addr;
  42 }
  43 EXPORT_SYMBOL(devm_ioremap);
  44
  45 /**
  46  * devm_ioremap_nocache - Managed ioremap_nocache()
  47  * @dev: Generic device to remap IO address for
  48  * @offset: BUS offset to map
  49  * @size: Size of map
  50  *
  51  * Managed ioremap_nocache().  Map is automatically unmapped on driver
  52  * detach.
  53  */
  54 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  55                                    resource_size_t size)
  56 {
  57         void __iomem **ptr, *addr;
  58
  59         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  60         if (!ptr)
  61                 return NULL;
  62
  63         addr = ioremap_nocache(offset, size);
  64         if (addr) {
  65                 *ptr = addr;
  66                 devres_add(dev, ptr);
  67         } else
  68                 devres_free(ptr);
  69
  70         return addr;
  71 }
  72 EXPORT_SYMBOL(devm_ioremap_nocache);
  73
  74 /**
  75  * devm_ioremap_wc - Managed ioremap_wc()
  76  * @dev: Generic device to remap IO address for
  77  * @offset: BUS offset to map
  78  * @size: Size of map
  79  *
  80  * Managed ioremap_wc().  Map is automatically unmapped on driver detach.
  81  */
  82 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
  83                               resource_size_t size)
  84 {
  85         void __iomem **ptr, *addr;
  86
  87         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  88         if (!ptr)
  89                 return NULL;
  90
  91         addr = ioremap_wc(offset, size);
  92         if (addr) {
  93                 *ptr = addr;
  94                 devres_add(dev, ptr);
  95         } else
  96                 devres_free(ptr);
  97
  98         return addr;
  99 }
 100 EXPORT_SYMBOL(devm_ioremap_wc);
 101
 102 /**
 103  * devm_iounmap - Managed iounmap()
 104  * @dev: Generic device to unmap for
 105  * @addr: Address to unmap
 106  *
 107  * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
 108  */
 109 void devm_iounmap(struct device *dev, void __iomem *addr)
 110 {
 111         WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
 112                                (__force void *)addr));
 113         iounmap(addr);
 114 }
 115 EXPORT_SYMBOL(devm_iounmap);
 116
 117 /**
 118  * devm_ioremap_resource() - check, request region, and ioremap resource
 119  * @dev: generic device to handle the resource for
 120  * @res: resource to be handled
 121  *
 122  * Checks that a resource is a valid memory region, requests the memory
 123  * region and ioremaps it. All operations are managed and will be undone
 124  * on driver detach.
 125  *
 126  * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
 127  * on failure. Usage example:
 128  *
 129  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 130  *      base = devm_ioremap_resource(&pdev->dev, res);
 131  *      if (IS_ERR(base))
 132  *              return PTR_ERR(base);
 133  */
 134 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 135 {
 136         resource_size_t size;
 137         const char *name;
 138         void __iomem *dest_ptr;
 139
 140         BUG_ON(!dev);
 141
 142         if (!res || resource_type(res) != IORESOURCE_MEM) {
 143                 dev_err(dev, "invalid resource\n");
 144                 return IOMEM_ERR_PTR(-EINVAL);
 145         }
 146
 147         size = resource_size(res);
 148         name = res->name ?: dev_name(dev);
 149
 150         if (!devm_request_mem_region(dev, res->start, size, name)) {
 151                 dev_err(dev, "can't request region for resource %pR\n", res);
 152                 return IOMEM_ERR_PTR(-EBUSY);
 153         }
 154
 155         dest_ptr = devm_ioremap(dev, res->start, size);
 156         if (!dest_ptr) {
 157                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 158                 devm_release_mem_region(dev, res->start, size);
 159                 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
 160         }
 161
 162         return dest_ptr;
 163 }
 164 EXPORT_SYMBOL(devm_ioremap_resource);
 165
 166 #ifdef CONFIG_HAS_IOPORT_MAP
 167 /*
 168  * Generic iomap devres
 169  */
 170 static void devm_ioport_map_release(struct device *dev, void *res)
 171 {
 172         ioport_unmap(*(void __iomem **)res);
 173 }
 174
 175 static int devm_ioport_map_match(struct device *dev, void *res,
 176                                  void *match_data)
 177 {
 178         return *(void **)res == match_data;
 179 }
 180
 181 /**
 182  * devm_ioport_map - Managed ioport_map()
 183  * @dev: Generic device to map ioport for
 184  * @port: Port to map
 185  * @nr: Number of ports to map
 186  *
 187  * Managed ioport_map().  Map is automatically unmapped on driver
 188  * detach.
 189  */
 190 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 191                                unsigned int nr)
 192 {
 193         void __iomem **ptr, *addr;
 194
 195         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 196         if (!ptr)
 197                 return NULL;
 198
 199         addr = ioport_map(port, nr);
 200         if (addr) {
 201                 *ptr = addr;
 202                 devres_add(dev, ptr);
 203         } else
 204                 devres_free(ptr);
 205
 206         return addr;
 207 }
 208 EXPORT_SYMBOL(devm_ioport_map);
 209
 210 /**
 211  * devm_ioport_unmap - Managed ioport_unmap()
 212  * @dev: Generic device to unmap for
 213  * @addr: Address to unmap
 214  *
 215  * Managed ioport_unmap().  @addr must have been mapped using
 216  * devm_ioport_map().
 217  */
 218 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 219 {
 220         ioport_unmap(addr);
 221         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 222                                devm_ioport_map_match, (__force void *)addr));
 223 }
 224 EXPORT_SYMBOL(devm_ioport_unmap);
 225 #endif /* CONFIG_HAS_IOPORT_MAP */
 226
 227 #ifdef CONFIG_PCI
 228 /*
 229  * PCI iomap devres
 230  */
 231 #define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 232
 233 struct pcim_iomap_devres {
 234         void __iomem *table[PCIM_IOMAP_MAX];
 235 };
 236
 237 static void pcim_iomap_release(struct device *gendev, void *res)
 238 {
 239         struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 240         struct pcim_iomap_devres *this = res;
 241         int i;
 242
 243         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 244                 if (this->table[i])
 245                         pci_iounmap(dev, this->table[i]);
 246 }
 247
 248 /**
 249  * pcim_iomap_table - access iomap allocation table
 250  * @pdev: PCI device to access iomap table for
 251  *
 252  * Access iomap allocation table for @dev.  If iomap table doesn't
 253  * exist and @pdev is managed, it will be allocated.  All iomaps
 254  * recorded in the iomap table are automatically unmapped on driver
 255  * detach.
 256  *
 257  * This function might sleep when the table is first allocated but can
 258  * be safely called without context and guaranteed to succed once
 259  * allocated.
 260  */
 261 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 262 {
 263         struct pcim_iomap_devres *dr, *new_dr;
 264
 265         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 266         if (dr)
 267                 return dr->table;
 268
 269         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 270         if (!new_dr)
 271                 return NULL;
 272         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 273         return dr->table;
 274 }
 275 EXPORT_SYMBOL(pcim_iomap_table);
 276
 277 /**
 278  * pcim_iomap - Managed pcim_iomap()
 279  * @pdev: PCI device to iomap for
 280  * @bar: BAR to iomap
 281  * @maxlen: Maximum length of iomap
 282  *
 283  * Managed pci_iomap().  Map is automatically unmapped on driver
 284  * detach.
 285  */
 286 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 287 {
 288         void __iomem **tbl;
 289
 290         BUG_ON(bar >= PCIM_IOMAP_MAX);
 291
 292         tbl = (void __iomem **)pcim_iomap_table(pdev);
 293         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 294                 return NULL;
 295
 296         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 297         return tbl[bar];
 298 }
 299 EXPORT_SYMBOL(pcim_iomap);
 300
 301 /**
 302  * pcim_iounmap - Managed pci_iounmap()
 303  * @pdev: PCI device to iounmap for
 304  * @addr: Address to unmap
 305  *
 306  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 307  */
 308 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 309 {
 310         void __iomem **tbl;
 311         int i;
 312
 313         pci_iounmap(pdev, addr);
 314
 315         tbl = (void __iomem **)pcim_iomap_table(pdev);
 316         BUG_ON(!tbl);
 317
 318         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 319                 if (tbl[i] == addr) {
 320                         tbl[i] = NULL;
 321                         return;
 322                 }
 323         WARN_ON(1);
 324 }
 325 EXPORT_SYMBOL(pcim_iounmap);
 326
 327 /**
 328  * pcim_iomap_regions - Request and iomap PCI BARs
 329  * @pdev: PCI device to map IO resources for
 330  * @mask: Mask of BARs to request and iomap
 331  * @name: Name used when requesting regions
 332  *
 333  * Request and iomap regions specified by @mask.
 334  */
 335 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 336 {
 337         void __iomem * const *iomap;
 338         int i, rc;
 339
 340         iomap = pcim_iomap_table(pdev);
 341         if (!iomap)
 342                 return -ENOMEM;
 343
 344         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 345                 unsigned long len;
 346
 347                 if (!(mask & (1 << i)))
 348                         continue;
 349
 350                 rc = -EINVAL;
 351                 len = pci_resource_len(pdev, i);
 352                 if (!len)
 353                         goto err_inval;
 354
 355                 rc = pci_request_region(pdev, i, name);
 356                 if (rc)
 357                         goto err_inval;
 358
 359                 rc = -ENOMEM;
 360                 if (!pcim_iomap(pdev, i, 0))
 361                         goto err_region;
 362         }
 363
 364         return 0;
 365
 366  err_region:
 367         pci_release_region(pdev, i);
 368  err_inval:
 369         while (--i >= 0) {
 370                 if (!(mask & (1 << i)))
 371                         continue;
 372                 pcim_iounmap(pdev, iomap[i]);
 373                 pci_release_region(pdev, i);
 374         }
 375
 376         return rc;
 377 }
 378 EXPORT_SYMBOL(pcim_iomap_regions);
 379
 380 /**
 381  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 382  * @pdev: PCI device to map IO resources for
 383  * @mask: Mask of BARs to iomap
 384  * @name: Name used when requesting regions
 385  *
 386  * Request all PCI BARs and iomap regions specified by @mask.
 387  */
 388 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 389                                    const char *name)
 390 {
 391         int request_mask = ((1 << 6) - 1) & ~mask;
 392         int rc;
 393
 394         rc = pci_request_selected_regions(pdev, request_mask, name);
 395         if (rc)
 396                 return rc;
 397
 398         rc = pcim_iomap_regions(pdev, mask, name);
 399         if (rc)
 400                 pci_release_selected_regions(pdev, request_mask);
 401         return rc;
 402 }
 403 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 404
 405 /**
 406  * pcim_iounmap_regions - Unmap and release PCI BARs
 407  * @pdev: PCI device to map IO resources for
 408  * @mask: Mask of BARs to unmap and release
 409  *
 410  * Unmap and release regions specified by @mask.
 411  */
 412 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 413 {
 414         void __iomem * const *iomap;
 415         int i;
 416
 417         iomap = pcim_iomap_table(pdev);
 418         if (!iomap)
 419                 return;
 420
 421         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 422                 if (!(mask & (1 << i)))
 423                         continue;
 424
 425                 pcim_iounmap(pdev, iomap[i]);
 426                 pci_release_region(pdev, i);
 427         }
 428 }
 429 EXPORT_SYMBOL(pcim_iounmap_regions);
 430 #endif /* CONFIG_PCI */