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                 dev_err(dev, "can't generate pretty name for resource %pR\n", res);
 162                 return IOMEM_ERR_PTR(-ENOMEM);
 163         }
 164
 165         if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
 166                 dev_err(dev, "can't request region for resource %pR\n", res);
 167                 return IOMEM_ERR_PTR(-EBUSY);
 168         }
 169
 170         dest_ptr = __devm_ioremap(dev, res->start, size, type);
 171         if (!dest_ptr) {
 172                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 173                 devm_release_mem_region(dev, res->start, size);
 174                 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
 175         }
 176
 177         return dest_ptr;
 178 }
 179
 180 /**
 181  * devm_ioremap_resource() - check, request region, and ioremap resource
 182  * @dev: generic device to handle the resource for
 183  * @res: resource to be handled
 184  *
 185  * Checks that a resource is a valid memory region, requests the memory
 186  * region and ioremaps it. All operations are managed and will be undone
 187  * on driver detach.
 188  *
 189  * Usage example:
 190  *
 191  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 192  *      base = devm_ioremap_resource(&pdev->dev, res);
 193  *      if (IS_ERR(base))
 194  *              return PTR_ERR(base);
 195  *
 196  * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
 197  * on failure.
 198  */
 199 void __iomem *devm_ioremap_resource(struct device *dev,
 200                                     const struct resource *res)
 201 {
 202         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
 203 }
 204 EXPORT_SYMBOL(devm_ioremap_resource);
 205
 206 /**
 207  * devm_ioremap_resource_wc() - write-combined variant of
 208  *                              devm_ioremap_resource()
 209  * @dev: generic device to handle the resource for
 210  * @res: resource to be handled
 211  *
 212  * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
 213  * on failure.
 214  */
 215 void __iomem *devm_ioremap_resource_wc(struct device *dev,
 216                                        const struct resource *res)
 217 {
 218         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
 219 }
 220
 221 /*
 222  * devm_of_iomap - Requests a resource and maps the memory mapped IO
 223  *                 for a given device_node managed by a given device
 224  *
 225  * Checks that a resource is a valid memory region, requests the memory
 226  * region and ioremaps it. All operations are managed and will be undone
 227  * on driver detach of the device.
 228  *
 229  * This is to be used when a device requests/maps resources described
 230  * by other device tree nodes (children or otherwise).
 231  *
 232  * @dev:        The device "managing" the resource
 233  * @node:       The device-tree node where the resource resides
 234  * @index:      index of the MMIO range in the "reg" property
 235  * @size:       Returns the size of the resource (pass NULL if not needed)
 236  *
 237  * Usage example:
 238  *
 239  *      base = devm_of_iomap(&pdev->dev, node, 0, NULL);
 240  *      if (IS_ERR(base))
 241  *              return PTR_ERR(base);
 242  *
 243  * Please Note: This is not a one-to-one replacement for of_iomap() because the
 244  * of_iomap() function does not track whether the region is already mapped.  If
 245  * two drivers try to map the same memory, the of_iomap() function will succeed
 246  * but the devm_of_iomap() function will return -EBUSY.
 247  *
 248  * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded
 249  * error code on failure.
 250  */
 251 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
 252                             resource_size_t *size)
 253 {
 254         struct resource res;
 255
 256         if (of_address_to_resource(node, index, &res))
 257                 return IOMEM_ERR_PTR(-EINVAL);
 258         if (size)
 259                 *size = resource_size(&res);
 260         return devm_ioremap_resource(dev, &res);
 261 }
 262 EXPORT_SYMBOL(devm_of_iomap);
 263
 264 #ifdef CONFIG_HAS_IOPORT_MAP
 265 /*
 266  * Generic iomap devres
 267  */
 268 static void devm_ioport_map_release(struct device *dev, void *res)
 269 {
 270         ioport_unmap(*(void __iomem **)res);
 271 }
 272
 273 static int devm_ioport_map_match(struct device *dev, void *res,
 274                                  void *match_data)
 275 {
 276         return *(void **)res == match_data;
 277 }
 278
 279 /**
 280  * devm_ioport_map - Managed ioport_map()
 281  * @dev: Generic device to map ioport for
 282  * @port: Port to map
 283  * @nr: Number of ports to map
 284  *
 285  * Managed ioport_map().  Map is automatically unmapped on driver
 286  * detach.
 287  *
 288  * Return: a pointer to the remapped memory or NULL on failure.
 289  */
 290 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 291                                unsigned int nr)
 292 {
 293         void __iomem **ptr, *addr;
 294
 295         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 296         if (!ptr)
 297                 return NULL;
 298
 299         addr = ioport_map(port, nr);
 300         if (addr) {
 301                 *ptr = addr;
 302                 devres_add(dev, ptr);
 303         } else
 304                 devres_free(ptr);
 305
 306         return addr;
 307 }
 308 EXPORT_SYMBOL(devm_ioport_map);
 309
 310 /**
 311  * devm_ioport_unmap - Managed ioport_unmap()
 312  * @dev: Generic device to unmap for
 313  * @addr: Address to unmap
 314  *
 315  * Managed ioport_unmap().  @addr must have been mapped using
 316  * devm_ioport_map().
 317  */
 318 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 319 {
 320         ioport_unmap(addr);
 321         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 322                                devm_ioport_map_match, (__force void *)addr));
 323 }
 324 EXPORT_SYMBOL(devm_ioport_unmap);
 325 #endif /* CONFIG_HAS_IOPORT_MAP */
 326
 327 #ifdef CONFIG_PCI
 328 /*
 329  * PCI iomap devres
 330  */
 331 #define PCIM_IOMAP_MAX  PCI_STD_NUM_BARS
 332
 333 struct pcim_iomap_devres {
 334         void __iomem *table[PCIM_IOMAP_MAX];
 335 };
 336
 337 static void pcim_iomap_release(struct device *gendev, void *res)
 338 {
 339         struct pci_dev *dev = to_pci_dev(gendev);
 340         struct pcim_iomap_devres *this = res;
 341         int i;
 342
 343         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 344                 if (this->table[i])
 345                         pci_iounmap(dev, this->table[i]);
 346 }
 347
 348 /**
 349  * pcim_iomap_table - access iomap allocation table
 350  * @pdev: PCI device to access iomap table for
 351  *
 352  * Access iomap allocation table for @dev.  If iomap table doesn't
 353  * exist and @pdev is managed, it will be allocated.  All iomaps
 354  * recorded in the iomap table are automatically unmapped on driver
 355  * detach.
 356  *
 357  * This function might sleep when the table is first allocated but can
 358  * be safely called without context and guaranteed to succeed once
 359  * allocated.
 360  */
 361 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 362 {
 363         struct pcim_iomap_devres *dr, *new_dr;
 364
 365         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 366         if (dr)
 367                 return dr->table;
 368
 369         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 370         if (!new_dr)
 371                 return NULL;
 372         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 373         return dr->table;
 374 }
 375 EXPORT_SYMBOL(pcim_iomap_table);
 376
 377 /**
 378  * pcim_iomap - Managed pcim_iomap()
 379  * @pdev: PCI device to iomap for
 380  * @bar: BAR to iomap
 381  * @maxlen: Maximum length of iomap
 382  *
 383  * Managed pci_iomap().  Map is automatically unmapped on driver
 384  * detach.
 385  */
 386 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 387 {
 388         void __iomem **tbl;
 389
 390         BUG_ON(bar >= PCIM_IOMAP_MAX);
 391
 392         tbl = (void __iomem **)pcim_iomap_table(pdev);
 393         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 394                 return NULL;
 395
 396         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 397         return tbl[bar];
 398 }
 399 EXPORT_SYMBOL(pcim_iomap);
 400
 401 /**
 402  * pcim_iounmap - Managed pci_iounmap()
 403  * @pdev: PCI device to iounmap for
 404  * @addr: Address to unmap
 405  *
 406  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 407  */
 408 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 409 {
 410         void __iomem **tbl;
 411         int i;
 412
 413         pci_iounmap(pdev, addr);
 414
 415         tbl = (void __iomem **)pcim_iomap_table(pdev);
 416         BUG_ON(!tbl);
 417
 418         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 419                 if (tbl[i] == addr) {
 420                         tbl[i] = NULL;
 421                         return;
 422                 }
 423         WARN_ON(1);
 424 }
 425 EXPORT_SYMBOL(pcim_iounmap);
 426
 427 /**
 428  * pcim_iomap_regions - Request and iomap PCI BARs
 429  * @pdev: PCI device to map IO resources for
 430  * @mask: Mask of BARs to request and iomap
 431  * @name: Name used when requesting regions
 432  *
 433  * Request and iomap regions specified by @mask.
 434  */
 435 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 436 {
 437         void __iomem * const *iomap;
 438         int i, rc;
 439
 440         iomap = pcim_iomap_table(pdev);
 441         if (!iomap)
 442                 return -ENOMEM;
 443
 444         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 445                 unsigned long len;
 446
 447                 if (!(mask & (1 << i)))
 448                         continue;
 449
 450                 rc = -EINVAL;
 451                 len = pci_resource_len(pdev, i);
 452                 if (!len)
 453                         goto err_inval;
 454
 455                 rc = pci_request_region(pdev, i, name);
 456                 if (rc)
 457                         goto err_inval;
 458
 459                 rc = -ENOMEM;
 460                 if (!pcim_iomap(pdev, i, 0))
 461                         goto err_region;
 462         }
 463
 464         return 0;
 465
 466  err_region:
 467         pci_release_region(pdev, i);
 468  err_inval:
 469         while (--i >= 0) {
 470                 if (!(mask & (1 << i)))
 471                         continue;
 472                 pcim_iounmap(pdev, iomap[i]);
 473                 pci_release_region(pdev, i);
 474         }
 475
 476         return rc;
 477 }
 478 EXPORT_SYMBOL(pcim_iomap_regions);
 479
 480 /**
 481  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 482  * @pdev: PCI device to map IO resources for
 483  * @mask: Mask of BARs to iomap
 484  * @name: Name used when requesting regions
 485  *
 486  * Request all PCI BARs and iomap regions specified by @mask.
 487  */
 488 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 489                                    const char *name)
 490 {
 491         int request_mask = ((1 << 6) - 1) & ~mask;
 492         int rc;
 493
 494         rc = pci_request_selected_regions(pdev, request_mask, name);
 495         if (rc)
 496                 return rc;
 497
 498         rc = pcim_iomap_regions(pdev, mask, name);
 499         if (rc)
 500                 pci_release_selected_regions(pdev, request_mask);
 501         return rc;
 502 }
 503 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 504
 505 /**
 506  * pcim_iounmap_regions - Unmap and release PCI BARs
 507  * @pdev: PCI device to map IO resources for
 508  * @mask: Mask of BARs to unmap and release
 509  *
 510  * Unmap and release regions specified by @mask.
 511  */
 512 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 513 {
 514         void __iomem * const *iomap;
 515         int i;
 516
 517         iomap = pcim_iomap_table(pdev);
 518         if (!iomap)
 519                 return;
 520
 521         for (i = 0; i < PCIM_IOMAP_MAX; i++) {
 522                 if (!(mask & (1 << i)))
 523                         continue;
 524
 525                 pcim_iounmap(pdev, iomap[i]);
 526                 pci_release_region(pdev, i);
 527         }
 528 }
 529 EXPORT_SYMBOL(pcim_iounmap_regions);
 530 #endif /* CONFIG_PCI */