1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bug.h> 3 #include <linux/device.h> 4 #include <linux/errno.h> 5 #include <linux/export.h> 6 #include <linux/gfp_types.h> 7 #include <linux/io.h> 8 #include <linux/ioport.h> 9 #include <linux/of_address.h> 10 #include <linux/types.h> 11 12 enum devm_ioremap_type { 13 DEVM_IOREMAP = 0, 14 DEVM_IOREMAP_UC, 15 DEVM_IOREMAP_WC, 16 DEVM_IOREMAP_NP, 17 }; 18 19 void devm_ioremap_release(struct device *dev, void *res) 20 { 21 iounmap(*(void __iomem **)res); 22 } 23 24 static int devm_ioremap_match(struct device *dev, void *res, void *match_data) 25 { 26 return *(void **)res == match_data; 27 } 28 29 static void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset, 30 resource_size_t size, 31 enum devm_ioremap_type type) 32 { 33 void __iomem **ptr, *addr = NULL; 34 35 ptr = devres_alloc_node(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL, 36 dev_to_node(dev)); 37 if (!ptr) 38 return NULL; 39 40 switch (type) { 41 case DEVM_IOREMAP: 42 addr = ioremap(offset, size); 43 break; 44 case DEVM_IOREMAP_UC: 45 addr = ioremap_uc(offset, size); 46 break; 47 case DEVM_IOREMAP_WC: 48 addr = ioremap_wc(offset, size); 49 break; 50 case DEVM_IOREMAP_NP: 51 addr = ioremap_np(offset, size); 52 break; 53 } 54 55 if (addr) { 56 *ptr = addr; 57 devres_add(dev, ptr); 58 } else 59 devres_free(ptr); 60 61 return addr; 62 } 63 64 /** 65 * devm_ioremap - Managed ioremap() 66 * @dev: Generic device to remap IO address for 67 * @offset: Resource address to map 68 * @size: Size of map 69 * 70 * Managed ioremap(). Map is automatically unmapped on driver detach. 71 */ 72 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, 73 resource_size_t size) 74 { 75 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP); 76 } 77 EXPORT_SYMBOL(devm_ioremap); 78 79 /** 80 * devm_ioremap_uc - Managed ioremap_uc() 81 * @dev: Generic device to remap IO address for 82 * @offset: Resource address to map 83 * @size: Size of map 84 * 85 * Managed ioremap_uc(). Map is automatically unmapped on driver detach. 86 */ 87 void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset, 88 resource_size_t size) 89 { 90 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_UC); 91 } 92 EXPORT_SYMBOL_GPL(devm_ioremap_uc); 93 94 /** 95 * devm_ioremap_wc - Managed ioremap_wc() 96 * @dev: Generic device to remap IO address for 97 * @offset: Resource address to map 98 * @size: Size of map 99 * 100 * Managed ioremap_wc(). Map is automatically unmapped on driver detach. 101 */ 102 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, 103 resource_size_t size) 104 { 105 return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC); 106 } 107 EXPORT_SYMBOL(devm_ioremap_wc); 108 109 /** 110 * devm_iounmap - Managed iounmap() 111 * @dev: Generic device to unmap for 112 * @addr: Address to unmap 113 * 114 * Managed iounmap(). @addr must have been mapped using devm_ioremap*(). 115 */ 116 void devm_iounmap(struct device *dev, void __iomem *addr) 117 { 118 WARN_ON(devres_release(dev, devm_ioremap_release, devm_ioremap_match, 119 (__force void *)addr)); 120 } 121 EXPORT_SYMBOL(devm_iounmap); 122 123 static void __iomem * 124 __devm_ioremap_resource(struct device *dev, const struct resource *res, 125 enum devm_ioremap_type type) 126 { 127 resource_size_t size; 128 void __iomem *dest_ptr; 129 char *pretty_name; 130 int ret; 131 132 BUG_ON(!dev); 133 134 if (!res || resource_type(res) != IORESOURCE_MEM) { 135 ret = dev_err_probe(dev, -EINVAL, "invalid resource %pR\n", res); 136 return IOMEM_ERR_PTR(ret); 137 } 138 139 if (type == DEVM_IOREMAP && res->flags & IORESOURCE_MEM_NONPOSTED) 140 type = DEVM_IOREMAP_NP; 141 142 size = resource_size(res); 143 144 if (res->name) 145 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s", 146 dev_name(dev), res->name); 147 else 148 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL); 149 if (!pretty_name) { 150 ret = dev_err_probe(dev, -ENOMEM, "can't generate pretty name for resource %pR\n", res); 151 return IOMEM_ERR_PTR(ret); 152 } 153 154 if (!devm_request_mem_region(dev, res->start, size, pretty_name)) { 155 ret = dev_err_probe(dev, -EBUSY, "can't request region for resource %pR\n", res); 156 return IOMEM_ERR_PTR(ret); 157 } 158 159 dest_ptr = __devm_ioremap(dev, res->start, size, type); 160 if (!dest_ptr) { 161 devm_release_mem_region(dev, res->start, size); 162 ret = dev_err_probe(dev, -ENOMEM, "ioremap failed for resource %pR\n", res); 163 return IOMEM_ERR_PTR(ret); 164 } 165 166 return dest_ptr; 167 } 168 169 /** 170 * devm_ioremap_resource() - check, request region, and ioremap resource 171 * @dev: generic device to handle the resource for 172 * @res: resource to be handled 173 * 174 * Checks that a resource is a valid memory region, requests the memory 175 * region and ioremaps it. All operations are managed and will be undone 176 * on driver detach. 177 * 178 * Usage example: 179 * 180 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 181 * base = devm_ioremap_resource(&pdev->dev, res); 182 * if (IS_ERR(base)) 183 * return PTR_ERR(base); 184 * 185 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code 186 * on failure. 187 */ 188 void __iomem *devm_ioremap_resource(struct device *dev, 189 const struct resource *res) 190 { 191 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP); 192 } 193 EXPORT_SYMBOL(devm_ioremap_resource); 194 195 /** 196 * devm_ioremap_resource_wc() - write-combined variant of 197 * devm_ioremap_resource() 198 * @dev: generic device to handle the resource for 199 * @res: resource to be handled 200 * 201 * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code 202 * on failure. 203 */ 204 void __iomem *devm_ioremap_resource_wc(struct device *dev, 205 const struct resource *res) 206 { 207 return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC); 208 } 209 210 /* 211 * devm_of_iomap - Requests a resource and maps the memory mapped IO 212 * for a given device_node managed by a given device 213 * 214 * Checks that a resource is a valid memory region, requests the memory 215 * region and ioremaps it. All operations are managed and will be undone 216 * on driver detach of the device. 217 * 218 * This is to be used when a device requests/maps resources described 219 * by other device tree nodes (children or otherwise). 220 * 221 * @dev: The device "managing" the resource 222 * @node: The device-tree node where the resource resides 223 * @index: index of the MMIO range in the "reg" property 224 * @size: Returns the size of the resource (pass NULL if not needed) 225 * 226 * Usage example: 227 * 228 * base = devm_of_iomap(&pdev->dev, node, 0, NULL); 229 * if (IS_ERR(base)) 230 * return PTR_ERR(base); 231 * 232 * Please Note: This is not a one-to-one replacement for of_iomap() because the 233 * of_iomap() function does not track whether the region is already mapped. If 234 * two drivers try to map the same memory, the of_iomap() function will succeed 235 * but the devm_of_iomap() function will return -EBUSY. 236 * 237 * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded 238 * error code on failure. 239 */ 240 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index, 241 resource_size_t *size) 242 { 243 struct resource res; 244 245 if (of_address_to_resource(node, index, &res)) 246 return IOMEM_ERR_PTR(-EINVAL); 247 if (size) 248 *size = resource_size(&res); 249 return devm_ioremap_resource(dev, &res); 250 } 251 EXPORT_SYMBOL(devm_of_iomap); 252 253 #ifdef CONFIG_HAS_IOPORT_MAP 254 /* 255 * Generic iomap devres 256 */ 257 static void devm_ioport_map_release(struct device *dev, void *res) 258 { 259 ioport_unmap(*(void __iomem **)res); 260 } 261 262 static int devm_ioport_map_match(struct device *dev, void *res, 263 void *match_data) 264 { 265 return *(void **)res == match_data; 266 } 267 268 /** 269 * devm_ioport_map - Managed ioport_map() 270 * @dev: Generic device to map ioport for 271 * @port: Port to map 272 * @nr: Number of ports to map 273 * 274 * Managed ioport_map(). Map is automatically unmapped on driver 275 * detach. 276 * 277 * Return: a pointer to the remapped memory or NULL on failure. 278 */ 279 void __iomem *devm_ioport_map(struct device *dev, unsigned long port, 280 unsigned int nr) 281 { 282 void __iomem **ptr, *addr; 283 284 ptr = devres_alloc_node(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL, 285 dev_to_node(dev)); 286 if (!ptr) 287 return NULL; 288 289 addr = ioport_map(port, nr); 290 if (addr) { 291 *ptr = addr; 292 devres_add(dev, ptr); 293 } else 294 devres_free(ptr); 295 296 return addr; 297 } 298 EXPORT_SYMBOL(devm_ioport_map); 299 300 /** 301 * devm_ioport_unmap - Managed ioport_unmap() 302 * @dev: Generic device to unmap for 303 * @addr: Address to unmap 304 * 305 * Managed ioport_unmap(). @addr must have been mapped using 306 * devm_ioport_map(). 307 */ 308 void devm_ioport_unmap(struct device *dev, void __iomem *addr) 309 { 310 WARN_ON(devres_release(dev, devm_ioport_map_release, 311 devm_ioport_map_match, (__force void *)addr)); 312 } 313 EXPORT_SYMBOL(devm_ioport_unmap); 314 #endif /* CONFIG_HAS_IOPORT_MAP */ 315 316 static void devm_arch_phys_ac_add_release(struct device *dev, void *res) 317 { 318 arch_phys_wc_del(*((int *)res)); 319 } 320 321 /** 322 * devm_arch_phys_wc_add - Managed arch_phys_wc_add() 323 * @dev: Managed device 324 * @base: Memory base address 325 * @size: Size of memory range 326 * 327 * Adds a WC MTRR using arch_phys_wc_add() and sets up a release callback. 328 * See arch_phys_wc_add() for more information. 329 */ 330 int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size) 331 { 332 int *mtrr; 333 int ret; 334 335 mtrr = devres_alloc_node(devm_arch_phys_ac_add_release, sizeof(*mtrr), GFP_KERNEL, 336 dev_to_node(dev)); 337 if (!mtrr) 338 return -ENOMEM; 339 340 ret = arch_phys_wc_add(base, size); 341 if (ret < 0) { 342 devres_free(mtrr); 343 return ret; 344 } 345 346 *mtrr = ret; 347 devres_add(dev, mtrr); 348 349 return ret; 350 } 351 EXPORT_SYMBOL(devm_arch_phys_wc_add); 352 353 struct arch_io_reserve_memtype_wc_devres { 354 resource_size_t start; 355 resource_size_t size; 356 }; 357 358 static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res) 359 { 360 const struct arch_io_reserve_memtype_wc_devres *this = res; 361 362 arch_io_free_memtype_wc(this->start, this->size); 363 } 364 365 /** 366 * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc() 367 * @dev: Managed device 368 * @start: Memory base address 369 * @size: Size of memory range 370 * 371 * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc() 372 * and sets up a release callback See arch_io_reserve_memtype_wc() for more 373 * information. 374 */ 375 int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start, 376 resource_size_t size) 377 { 378 struct arch_io_reserve_memtype_wc_devres *dr; 379 int ret; 380 381 dr = devres_alloc_node(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL, 382 dev_to_node(dev)); 383 if (!dr) 384 return -ENOMEM; 385 386 ret = arch_io_reserve_memtype_wc(start, size); 387 if (ret < 0) { 388 devres_free(dr); 389 return ret; 390 } 391 392 dr->start = start; 393 dr->size = size; 394 devres_add(dev, dr); 395 396 return ret; 397 } 398 EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc); 399