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         DEVM_IOREMAP_NP,
  14 };
  15
  16 void devm_ioremap_release(struct device *dev, void *res)
  17 {
  18         iounmap(*(void __iomem **)res);
  19 }
  20
  21 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  22 {
  23         return *(void **)res == match_data;
  24 }
  25
  26 static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
  27                                     resource_size_t size,
  28                                     enum devm_ioremap_type type)
  29 {
  30         void __iomem **ptr, *addr = NULL;
  31
  32         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  33         if (!ptr)
  34                 return NULL;
  35
  36         switch (type) {
  37         case DEVM_IOREMAP:
  38                 addr = ioremap(offset, size);
  39                 break;
  40         case DEVM_IOREMAP_UC:
  41                 addr = ioremap_uc(offset, size);
  42                 break;
  43         case DEVM_IOREMAP_WC:
  44                 addr = ioremap_wc(offset, size);
  45                 break;
  46         case DEVM_IOREMAP_NP:
  47                 addr = ioremap_np(offset, size);
  48                 break;
  49         }
  50
  51         if (addr) {
  52                 *ptr = addr;
  53                 devres_add(dev, ptr);
  54         } else
  55                 devres_free(ptr);
  56
  57         return addr;
  58 }
  59
  60 /**
  61  * devm_ioremap - Managed ioremap()
  62  * @dev: Generic device to remap IO address for
  63  * @offset: Resource address to map
  64  * @size: Size of map
  65  *
  66  * Managed ioremap().  Map is automatically unmapped on driver detach.
  67  */
  68 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  69                            resource_size_t size)
  70 {
  71         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP);
  72 }
  73 EXPORT_SYMBOL(devm_ioremap);
  74
  75 /**
  76  * devm_ioremap_uc - Managed ioremap_uc()
  77  * @dev: Generic device to remap IO address for
  78  * @offset: Resource address to map
  79  * @size: Size of map
  80  *
  81  * Managed ioremap_uc().  Map is automatically unmapped on driver detach.
  82  */
  83 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
  84                               resource_size_t size)
  85 {
  86         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC);
  87 }
  88 EXPORT_SYMBOL_GPL(devm_ioremap_uc);
  89
  90 /**
  91  * devm_ioremap_wc - Managed ioremap_wc()
  92  * @dev: Generic device to remap IO address for
  93  * @offset: Resource address to map
  94  * @size: Size of map
  95  *
  96  * Managed ioremap_wc().  Map is automatically unmapped on driver detach.
  97  */
  98 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
  99                               resource_size_t size)
 100 {
 101         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
 102 }
 103 EXPORT_SYMBOL(devm_ioremap_wc);
 104
 105 /**
 106  * devm_ioremap_np - Managed ioremap_np()
 107  * @dev: Generic device to remap IO address for
 108  * @offset: Resource address to map
 109  * @size: Size of map
 110  *
 111  * Managed ioremap_np().  Map is automatically unmapped on driver detach.
 112  */
 113 void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
 114                               resource_size_t size)
 115 {
 116         return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_NP);
 117 }
 118 EXPORT_SYMBOL(devm_ioremap_np);
 119
 120 /**
 121  * devm_iounmap - Managed iounmap()
 122  * @dev: Generic device to unmap for
 123  * @addr: Address to unmap
 124  *
 125  * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
 126  */
 127 void devm_iounmap(struct device *dev, void __iomem *addr)
 128 {
 129         WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
 130                                (__force void *)addr));
 131         iounmap(addr);
 132 }
 133 EXPORT_SYMBOL(devm_iounmap);
 134
 135 static void __iomem *
 136 __devm_ioremap_resource(struct device *dev, const struct resource *res,
 137                         enum devm_ioremap_type type)
 138 {
 139         resource_size_t size;
 140         void __iomem *dest_ptr;
 141         char *pretty_name;
 142
 143         BUG_ON(!dev);
 144
 145         if (!res || resource_type(res) != IORESOURCE_MEM) {
 146                 dev_err(dev, "invalid resource\n");
 147                 return IOMEM_ERR_PTR(-EINVAL);
 148         }
 149
 150         if (type == DEVM_IOREMAP && res->flags & IORESOURCE_MEM_NONPOSTED)
 151                 type = DEVM_IOREMAP_NP;
 152
 153         size = resource_size(res);
 154
 155         if (res->name)
 156                 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s",
 157                                              dev_name(dev), res->name);
 158         else
 159                 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
 160         if (!pretty_name)
 161                 return IOMEM_ERR_PTR(-ENOMEM);
 162
 163         if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
 164                 dev_err(dev, "can't request region for resource %pR\n", res);
 165                 return IOMEM_ERR_PTR(-EBUSY);
 166         }
 167
 168         dest_ptr = __devm_ioremap(dev, res->start, size, type);
 169         if (!dest_ptr) {
 170                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 171                 devm_release_mem_region(dev, res->start, size);
 172                 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
 173         }
 174
 175         return dest_ptr;
 176 }
 177
 178 /**
 179  * devm_ioremap_resource() - check, request region, and ioremap resource
 180  * @dev: generic device to handle the resource for
 181  * @res: resource to be handled
 182  *
 183  * Checks that a resource is a valid memory region, requests the memory
 184  * region and ioremaps it. All operations are managed and will be undone
 185  * on driver detach.
 186  *
 187  * Usage example:
 188  *
 189  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 190  *      base = devm_ioremap_resource(&pdev->dev, res);
 191  *      if (IS_ERR(base))
 192  *              return PTR_ERR(base);
 193  *
 194  * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
 195  * on failure.
 196  */
 197 void __iomem *devm_ioremap_resource(struct device *dev,
 198                                     const struct resource *res)
 199 {
 200         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
 201 }
 202 EXPORT_SYMBOL(devm_ioremap_resource);
 203
 204 /**
 205  * devm_ioremap_resource_wc() - write-combined variant of
 206  *                              devm_ioremap_resource()
 207  * @dev: generic device to handle the resource for
 208  * @res: resource to be handled
 209  *
 210  * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
 211  * on failure.
 212  */
 213 void __iomem *devm_ioremap_resource_wc(struct device *dev,
 214                                        const struct resource *res)
 215 {
 216         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
 217 }
 218
 219 /*
 220  * devm_of_iomap - Requests a resource and maps the memory mapped IO
 221  *                 for a given device_node managed by a given device
 222  *
 223  * Checks that a resource is a valid memory region, requests the memory
 224  * region and ioremaps it. All operations are managed and will be undone
 225  * on driver detach of the device.
 226  *
 227  * This is to be used when a device requests/maps resources described
 228  * by other device tree nodes (children or otherwise).
 229  *
 230  * @dev:        The device "managing" the resource
 231  * @node:       The device-tree node where the resource resides
 232  * @index:      index of the MMIO range in the "reg" property
 233  * @size:       Returns the size of the resource (pass NULL if not needed)
 234  *
 235  * Usage example:
 236  *
 237  *      base = devm_of_iomap(&pdev->dev, node, 0, NULL);
 238  *      if (IS_ERR(base))
 239  *              return PTR_ERR(base);
 240  *
 241  * Please Note: This is not a one-to-one replacement for of_iomap() because the
 242  * of_iomap() function does not track whether the region is already mapped.  If
 243  * two drivers try to map the same memory, the of_iomap() function will succeed
 244  * but the devm_of_iomap() function will return -EBUSY.
 245  *
 246  * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded
 247  * error code on failure.
 248  */
 249 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
 250                             resource_size_t *size)
 251 {
 252         struct resource res;
 253
 254         if (of_address_to_resource(node, index, &res))
 255                 return IOMEM_ERR_PTR(-EINVAL);
 256         if (size)
 257                 *size = resource_size(&res);
 258         return devm_ioremap_resource(dev, &res);
 259 }
 260 EXPORT_SYMBOL(devm_of_iomap);
 261
 262 #ifdef CONFIG_HAS_IOPORT_MAP
 263 /*
 264  * Generic iomap devres
 265  */
 266 static void devm_ioport_map_release(struct device *dev, void *res)
 267 {
 268         ioport_unmap(*(void __iomem **)res);
 269 }
 270
 271 static int devm_ioport_map_match(struct device *dev, void *res,
 272                                  void *match_data)
 273 {
 274         return *(void **)res == match_data;
 275 }
 276
 277 /**
 278  * devm_ioport_map - Managed ioport_map()
 279  * @dev: Generic device to map ioport for
 280  * @port: Port to map
 281  * @nr: Number of ports to map
 282  *
 283  * Managed ioport_map().  Map is automatically unmapped on driver
 284  * detach.
 285  *
 286  * Return: a pointer to the remapped memory or NULL on failure.
 287  */
 288 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 289                                unsigned int nr)
 290 {
 291         void __iomem **ptr, *addr;
 292
 293         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 294         if (!ptr)
 295                 return NULL;
 296
 297         addr = ioport_map(port, nr);
 298         if (addr) {
 299                 *ptr = addr;
 300                 devres_add(dev, ptr);
 301         } else
 302                 devres_free(ptr);
 303
 304         return addr;
 305 }
 306 EXPORT_SYMBOL(devm_ioport_map);
 307
 308 /**
 309  * devm_ioport_unmap - Managed ioport_unmap()
 310  * @dev: Generic device to unmap for
 311  * @addr: Address to unmap
 312  *
 313  * Managed ioport_unmap().  @addr must have been mapped using
 314  * devm_ioport_map().
 315  */
 316 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 317 {
 318         ioport_unmap(addr);
 319         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 320                                devm_ioport_map_match, (__force void *)addr));
 321 }
 322 EXPORT_SYMBOL(devm_ioport_unmap);
 323 #endif /* CONFIG_HAS_IOPORT_MAP */
 324
 325 #ifdef CONFIG_PCI
 326 /*
 327  * PCI iomap devres
 328  */
 329 #define PCIM_IOMAP_MAX  PCI_STD_NUM_BARS
 330
 331 struct pcim_iomap_devres {
 332         void __iomem *table[PCIM_IOMAP_MAX];
 333 };
 334
 335 static void pcim_iomap_release(struct device *gendev, void *res)
 336 {
 337         struct pci_dev *dev = to_pci_dev(gendev);
 338         struct pcim_iomap_devres *this = res;
 339         int i;
 340
 341         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 342                 if (this->table[i])
 343                         pci_iounmap(dev, this->table[i]);
 344 }
 345
 346 /**
 347  * pcim_iomap_table - access iomap allocation table
 348  * @pdev: PCI device to access iomap table for
 349  *
 350  * Access iomap allocation table for @dev.  If iomap table doesn't
 351  * exist and @pdev is managed, it will be allocated.  All iomaps
 352  * recorded in the iomap table are automatically unmapped on driver
 353  * detach.
 354  *
 355  * This function might sleep when the table is first allocated but can
 356  * be safely called without context and guaranteed to succed once
 357  * allocated.
 358  */
 359 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 360 {
 361         struct pcim_iomap_devres *dr, *new_dr;
 362
 363         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 364         if (dr)
 365                 return dr->table;
 366
 367         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 368         if (!new_dr)
 369                 return NULL;
 370         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 371         return dr->table;
 372 }
 373 EXPORT_SYMBOL(pcim_iomap_table);
 374
 375 /**
 376  * pcim_iomap - Managed pcim_iomap()
 377  * @pdev: PCI device to iomap for
 378  * @bar: BAR to iomap
 379  * @maxlen: Maximum length of iomap
 380  *
 381  * Managed pci_iomap().  Map is automatically unmapped on driver
 382  * detach.
 383  */
 384 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 385 {
 386         void __iomem **tbl;
 387
 388         BUG_ON(bar >= PCIM_IOMAP_MAX);
 389
 390         tbl = (void __iomem **)pcim_iomap_table(pdev);
 391         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 392                 return NULL;
 393
 394         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 395         return tbl[bar];
 396 }
 397 EXPORT_SYMBOL(pcim_iomap);
 398
 399 /**
 400  * pcim_iounmap - Managed pci_iounmap()
 401  * @pdev: PCI device to iounmap for
 402  * @addr: Address to unmap
 403  *
 404  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 405  */
 406 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 407 {
 408         void __iomem **tbl;
 409         int i;
 410
 411         pci_iounmap(pdev, addr);
 412
 413         tbl = (void __iomem **)pcim_iomap_table(pdev);
 414         BUG_ON(!tbl);
 415
 416         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 417                 if (tbl[i] == addr) {
 418                         tbl[i] = NULL;
 419                         return;
 420                 }
 421         WARN_ON(1);
 422 }
 423 EXPORT_SYMBOL(pcim_iounmap);
 424
 425 /**
 426  * pcim_iomap_regions - Request and iomap PCI BARs
 427  * @pdev: PCI device to map IO resources for
 428  * @mask: Mask of BARs to request and iomap
 429  * @name: Name used when requesting regions
 430  *
 431  * Request and iomap regions specified by @mask.
 432  */
 433 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 434 {
 435         void __iomem * const *iomap;
 436         int i, rc;
 437
 438         iomap = pcim_iomap_table(pdev);
 439         if (!iomap)
 440                 return -ENOMEM;
 441
 442         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 443                 unsigned long len;
 444
 445                 if (!(mask & (1 << i)))
 446                         continue;
 447
 448                 rc = -EINVAL;
 449                 len = pci_resource_len(pdev, i);
 450                 if (!len)
 451                         goto err_inval;
 452
 453                 rc = pci_request_region(pdev, i, name);
 454                 if (rc)
 455                         goto err_inval;
 456
 457                 rc = -ENOMEM;
 458                 if (!pcim_iomap(pdev, i, 0))
 459                         goto err_region;
 460         }
 461
 462         return 0;
 463
 464  err_region:
 465         pci_release_region(pdev, i);
 466  err_inval:
 467         while (--i >= 0) {
 468                 if (!(mask & (1 << i)))
 469                         continue;
 470                 pcim_iounmap(pdev, iomap[i]);
 471                 pci_release_region(pdev, i);
 472         }
 473
 474         return rc;
 475 }
 476 EXPORT_SYMBOL(pcim_iomap_regions);
 477
 478 /**
 479  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 480  * @pdev: PCI device to map IO resources for
 481  * @mask: Mask of BARs to iomap
 482  * @name: Name used when requesting regions
 483  *
 484  * Request all PCI BARs and iomap regions specified by @mask.
 485  */
 486 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 487                                    const char *name)
 488 {
 489         int request_mask = ((1 << 6) - 1) & ~mask;
 490         int rc;
 491
 492         rc = pci_request_selected_regions(pdev, request_mask, name);
 493         if (rc)
 494                 return rc;
 495
 496         rc = pcim_iomap_regions(pdev, mask, name);
 497         if (rc)
 498                 pci_release_selected_regions(pdev, request_mask);
 499         return rc;
 500 }
 501 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 502
 503 /**
 504  * pcim_iounmap_regions - Unmap and release PCI BARs
 505  * @pdev: PCI device to map IO resources for
 506  * @mask: Mask of BARs to unmap and release
 507  *
 508  * Unmap and release regions specified by @mask.
 509  */
 510 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 511 {
 512         void __iomem * const *iomap;
 513         int i;
 514
 515         iomap = pcim_iomap_table(pdev);
 516         if (!iomap)
 517                 return;
 518
 519         for (i = 0; i < PCIM_IOMAP_MAX; i++) {
 520                 if (!(mask & (1 << i)))
 521                         continue;
 522
 523                 pcim_iounmap(pdev, iomap[i]);
 524                 pci_release_region(pdev, i);
 525         }
 526 }
 527 EXPORT_SYMBOL(pcim_iounmap_regions);
 528 #endif /* CONFIG_PCI */