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