lib/devres.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/err.h>
   3 #include <linux/pci.h>
   4 #include <linux/io.h>
   5 #include <linux/gfp.h>
   6 #include <linux/export.h>
   7 #include <linux/of_address.h>
   8
   9 enum devm_ioremap_type {
  10         DEVM_IOREMAP = 0,
  11         DEVM_IOREMAP_UC,
  12         DEVM_IOREMAP_WC,
  13 };
  14
  15 void devm_ioremap_release(struct device *dev, void *res)
  16 {
  17         iounmap(*(void __iomem **)res);
  18 }
  19
  20 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  21 {
  22         return *(void **)res == match_data;
  23 }
  24
  25 static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
  26                                     resource_size_t size,
  27                                     enum devm_ioremap_type type)
  28 {
  29         void __iomem **ptr, *addr = NULL;
  30
  31         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  32         if (!ptr)
  33                 return NULL;
  34
  35         switch (type) {
  36         case DEVM_IOREMAP:
  37                 addr = ioremap(offset, size);
  38                 break;
  39         case DEVM_IOREMAP_UC:
  40                 addr = ioremap_uc(offset, size);
  41                 break;
  42         case DEVM_IOREMAP_WC:
  43                 addr = ioremap_wc(offset, size);
  44                 break;
  45         }
  46
  47         if (addr) {
  48                 *ptr = addr;
  49                 devres_add(dev, ptr);
  50         } else
  51                 devres_free(ptr);
  52
  53         return addr;
  54 }
  55
  56 /**
  57  * devm_ioremap - Managed ioremap()
  58  * @dev: Generic device to remap IO address for
  59  * @offset: Resource address to map
  60  * @size: Size of map
  61  *
  62  * Managed ioremap().  Map is automatically unmapped on driver detach.
  63  */
  64 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  65                            resource_size_t size)
  66 {
  67         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP);
  68 }
  69 EXPORT_SYMBOL(devm_ioremap);
  70
  71 /**
  72  * devm_ioremap_uc - Managed ioremap_uc()
  73  * @dev: Generic device to remap IO address for
  74  * @offset: Resource address to map
  75  * @size: Size of map
  76  *
  77  * Managed ioremap_uc().  Map is automatically unmapped on driver detach.
  78  */
  79 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
  80                               resource_size_t size)
  81 {
  82         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
  83 }
  84 EXPORT_SYMBOL_GPL(devm_ioremap_uc);
  85
  86 /**
  87  * devm_ioremap_wc - Managed ioremap_wc()
  88  * @dev: Generic device to remap IO address for
  89  * @offset: Resource address to map
  90  * @size: Size of map
  91  *
  92  * Managed ioremap_wc().  Map is automatically unmapped on driver detach.
  93  */
  94 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
  95                               resource_size_t size)
  96 {
  97         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
  98 }
  99 EXPORT_SYMBOL(devm_ioremap_wc);
 100
 101 /**
 102  * devm_iounmap - Managed iounmap()
 103  * @dev: Generic device to unmap for
 104  * @addr: Address to unmap
 105  *
 106  * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
 107  */
 108 void devm_iounmap(struct device *dev, void __iomem *addr)
 109 {
 110         WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
 111                                (__force void *)addr));
 112         iounmap(addr);
 113 }
 114 EXPORT_SYMBOL(devm_iounmap);
 115
 116 static void __iomem *
 117 __devm_ioremap_resource(struct device *dev, const struct resource *res,
 118                         enum devm_ioremap_type type)
 119 {
 120         resource_size_t size;
 121         void __iomem *dest_ptr;
 122         char *pretty_name;
 123
 124         BUG_ON(!dev);
 125
 126         if (!res || resource_type(res) != IORESOURCE_MEM) {
 127                 dev_err(dev, "invalid resource\n");
 128                 return IOMEM_ERR_PTR(-EINVAL);
 129         }
 130
 131         size = resource_size(res);
 132
 133         if (res->name)
 134                 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s",
 135                                              dev_name(dev), res->name);
 136         else
 137                 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
 138         if (!pretty_name)
 139                 return IOMEM_ERR_PTR(-ENOMEM);
 140
 141         if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
 142                 dev_err(dev, "can't request region for resource %pR\n", res);
 143                 return IOMEM_ERR_PTR(-EBUSY);
 144         }
 145
 146         dest_ptr = __devm_ioremap(dev, res->start, size, type);
 147         if (!dest_ptr) {
 148                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 149                 devm_release_mem_region(dev, res->start, size);
 150                 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
 151         }
 152
 153         return dest_ptr;
 154 }
 155
 156 /**
 157  * devm_ioremap_resource() - check, request region, and ioremap resource
 158  * @dev: generic device to handle the resource for
 159  * @res: resource to be handled
 160  *
 161  * Checks that a resource is a valid memory region, requests the memory
 162  * region and ioremaps it. All operations are managed and will be undone
 163  * on driver detach.
 164  *
 165  * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
 166  * on failure. Usage example:
 167  *
 168  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 169  *      base = devm_ioremap_resource(&pdev->dev, res);
 170  *      if (IS_ERR(base))
 171  *              return PTR_ERR(base);
 172  */
 173 void __iomem *devm_ioremap_resource(struct device *dev,
 174                                     const struct resource *res)
 175 {
 176         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
 177 }
 178 EXPORT_SYMBOL(devm_ioremap_resource);
 179
 180 /**
 181  * devm_ioremap_resource_wc() - write-combined variant of
 182  *                              devm_ioremap_resource()
 183  * @dev: generic device to handle the resource for
 184  * @res: resource to be handled
 185  *
 186  * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
 187  * on failure. Usage example:
 188  */
 189 void __iomem *devm_ioremap_resource_wc(struct device *dev,
 190                                        const struct resource *res)
 191 {
 192         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
 193 }
 194
 195 /*
 196  * devm_of_iomap - Requests a resource and maps the memory mapped IO
 197  *                 for a given device_node managed by a given device
 198  *
 199  * Checks that a resource is a valid memory region, requests the memory
 200  * region and ioremaps it. All operations are managed and will be undone
 201  * on driver detach of the device.
 202  *
 203  * This is to be used when a device requests/maps resources described
 204  * by other device tree nodes (children or otherwise).
 205  *
 206  * @dev:        The device "managing" the resource
 207  * @node:       The device-tree node where the resource resides
 208  * @index:      index of the MMIO range in the "reg" property
 209  * @size:       Returns the size of the resource (pass NULL if not needed)
 210  * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded
 211  * error code on failure. Usage example:
 212  *
 213  *      base = devm_of_iomap(&pdev->dev, node, 0, NULL);
 214  *      if (IS_ERR(base))
 215  *              return PTR_ERR(base);
 216  *
 217  * Please Note: This is not a one-to-one replacement for of_iomap() because the
 218  * of_iomap() function does not track whether the region is already mapped.  If
 219  * two drivers try to map the same memory, the of_iomap() function will succeed
 220  * but the the devm_of_iomap() function will return -EBUSY.
 221  *
 222  */
 223 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
 224                             resource_size_t *size)
 225 {
 226         struct resource res;
 227
 228         if (of_address_to_resource(node, index, &res))
 229                 return IOMEM_ERR_PTR(-EINVAL);
 230         if (size)
 231                 *size = resource_size(&res);
 232         return devm_ioremap_resource(dev, &res);
 233 }
 234 EXPORT_SYMBOL(devm_of_iomap);
 235
 236 #ifdef CONFIG_HAS_IOPORT_MAP
 237 /*
 238  * Generic iomap devres
 239  */
 240 static void devm_ioport_map_release(struct device *dev, void *res)
 241 {
 242         ioport_unmap(*(void __iomem **)res);
 243 }
 244
 245 static int devm_ioport_map_match(struct device *dev, void *res,
 246                                  void *match_data)
 247 {
 248         return *(void **)res == match_data;
 249 }
 250
 251 /**
 252  * devm_ioport_map - Managed ioport_map()
 253  * @dev: Generic device to map ioport for
 254  * @port: Port to map
 255  * @nr: Number of ports to map
 256  *
 257  * Managed ioport_map().  Map is automatically unmapped on driver
 258  * detach.
 259  */
 260 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 261                                unsigned int nr)
 262 {
 263         void __iomem **ptr, *addr;
 264
 265         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 266         if (!ptr)
 267                 return NULL;
 268
 269         addr = ioport_map(port, nr);
 270         if (addr) {
 271                 *ptr = addr;
 272                 devres_add(dev, ptr);
 273         } else
 274                 devres_free(ptr);
 275
 276         return addr;
 277 }
 278 EXPORT_SYMBOL(devm_ioport_map);
 279
 280 /**
 281  * devm_ioport_unmap - Managed ioport_unmap()
 282  * @dev: Generic device to unmap for
 283  * @addr: Address to unmap
 284  *
 285  * Managed ioport_unmap().  @addr must have been mapped using
 286  * devm_ioport_map().
 287  */
 288 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 289 {
 290         ioport_unmap(addr);
 291         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 292                                devm_ioport_map_match, (__force void *)addr));
 293 }
 294 EXPORT_SYMBOL(devm_ioport_unmap);
 295 #endif /* CONFIG_HAS_IOPORT_MAP */
 296
 297 #ifdef CONFIG_PCI
 298 /*
 299  * PCI iomap devres
 300  */
 301 #define PCIM_IOMAP_MAX  PCI_STD_NUM_BARS
 302
 303 struct pcim_iomap_devres {
 304         void __iomem *table[PCIM_IOMAP_MAX];
 305 };
 306
 307 static void pcim_iomap_release(struct device *gendev, void *res)
 308 {
 309         struct pci_dev *dev = to_pci_dev(gendev);
 310         struct pcim_iomap_devres *this = res;
 311         int i;
 312
 313         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 314                 if (this->table[i])
 315                         pci_iounmap(dev, this->table[i]);
 316 }
 317
 318 /**
 319  * pcim_iomap_table - access iomap allocation table
 320  * @pdev: PCI device to access iomap table for
 321  *
 322  * Access iomap allocation table for @dev.  If iomap table doesn't
 323  * exist and @pdev is managed, it will be allocated.  All iomaps
 324  * recorded in the iomap table are automatically unmapped on driver
 325  * detach.
 326  *
 327  * This function might sleep when the table is first allocated but can
 328  * be safely called without context and guaranteed to succed once
 329  * allocated.
 330  */
 331 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 332 {
 333         struct pcim_iomap_devres *dr, *new_dr;
 334
 335         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 336         if (dr)
 337                 return dr->table;
 338
 339         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 340         if (!new_dr)
 341                 return NULL;
 342         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 343         return dr->table;
 344 }
 345 EXPORT_SYMBOL(pcim_iomap_table);
 346
 347 /**
 348  * pcim_iomap - Managed pcim_iomap()
 349  * @pdev: PCI device to iomap for
 350  * @bar: BAR to iomap
 351  * @maxlen: Maximum length of iomap
 352  *
 353  * Managed pci_iomap().  Map is automatically unmapped on driver
 354  * detach.
 355  */
 356 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 357 {
 358         void __iomem **tbl;
 359
 360         BUG_ON(bar >= PCIM_IOMAP_MAX);
 361
 362         tbl = (void __iomem **)pcim_iomap_table(pdev);
 363         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 364                 return NULL;
 365
 366         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 367         return tbl[bar];
 368 }
 369 EXPORT_SYMBOL(pcim_iomap);
 370
 371 /**
 372  * pcim_iounmap - Managed pci_iounmap()
 373  * @pdev: PCI device to iounmap for
 374  * @addr: Address to unmap
 375  *
 376  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 377  */
 378 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 379 {
 380         void __iomem **tbl;
 381         int i;
 382
 383         pci_iounmap(pdev, addr);
 384
 385         tbl = (void __iomem **)pcim_iomap_table(pdev);
 386         BUG_ON(!tbl);
 387
 388         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 389                 if (tbl[i] == addr) {
 390                         tbl[i] = NULL;
 391                         return;
 392                 }
 393         WARN_ON(1);
 394 }
 395 EXPORT_SYMBOL(pcim_iounmap);
 396
 397 /**
 398  * pcim_iomap_regions - Request and iomap PCI BARs
 399  * @pdev: PCI device to map IO resources for
 400  * @mask: Mask of BARs to request and iomap
 401  * @name: Name used when requesting regions
 402  *
 403  * Request and iomap regions specified by @mask.
 404  */
 405 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 406 {
 407         void __iomem * const *iomap;
 408         int i, rc;
 409
 410         iomap = pcim_iomap_table(pdev);
 411         if (!iomap)
 412                 return -ENOMEM;
 413
 414         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 415                 unsigned long len;
 416
 417                 if (!(mask & (1 << i)))
 418                         continue;
 419
 420                 rc = -EINVAL;
 421                 len = pci_resource_len(pdev, i);
 422                 if (!len)
 423                         goto err_inval;
 424
 425                 rc = pci_request_region(pdev, i, name);
 426                 if (rc)
 427                         goto err_inval;
 428
 429                 rc = -ENOMEM;
 430                 if (!pcim_iomap(pdev, i, 0))
 431                         goto err_region;
 432         }
 433
 434         return 0;
 435
 436  err_region:
 437         pci_release_region(pdev, i);
 438  err_inval:
 439         while (--i >= 0) {
 440                 if (!(mask & (1 << i)))
 441                         continue;
 442                 pcim_iounmap(pdev, iomap[i]);
 443                 pci_release_region(pdev, i);
 444         }
 445
 446         return rc;
 447 }
 448 EXPORT_SYMBOL(pcim_iomap_regions);
 449
 450 /**
 451  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 452  * @pdev: PCI device to map IO resources for
 453  * @mask: Mask of BARs to iomap
 454  * @name: Name used when requesting regions
 455  *
 456  * Request all PCI BARs and iomap regions specified by @mask.
 457  */
 458 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 459                                    const char *name)
 460 {
 461         int request_mask = ((1 << 6) - 1) & ~mask;
 462         int rc;
 463
 464         rc = pci_request_selected_regions(pdev, request_mask, name);
 465         if (rc)
 466                 return rc;
 467
 468         rc = pcim_iomap_regions(pdev, mask, name);
 469         if (rc)
 470                 pci_release_selected_regions(pdev, request_mask);
 471         return rc;
 472 }
 473 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 474
 475 /**
 476  * pcim_iounmap_regions - Unmap and release PCI BARs
 477  * @pdev: PCI device to map IO resources for
 478  * @mask: Mask of BARs to unmap and release
 479  *
 480  * Unmap and release regions specified by @mask.
 481  */
 482 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 483 {
 484         void __iomem * const *iomap;
 485         int i;
 486
 487         iomap = pcim_iomap_table(pdev);
 488         if (!iomap)
 489                 return;
 490
 491         for (i = 0; i < PCIM_IOMAP_MAX; i++) {
 492                 if (!(mask & (1 << i)))
 493                         continue;
 494
 495                 pcim_iounmap(pdev, iomap[i]);
 496                 pci_release_region(pdev, i);
 497         }
 498 }
 499 EXPORT_SYMBOL(pcim_iounmap_regions);
 500 #endif /* CONFIG_PCI */