lib/devres.c

   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_destroy(dev, devm_ioremap_release, devm_ioremap_match,
 119                                (__force void *)addr));
 120         iounmap(addr);
 121 }
 122 EXPORT_SYMBOL(devm_iounmap);
 123
 124 static void __iomem *
 125 __devm_ioremap_resource(struct device *dev, const struct resource *res,
 126                         enum devm_ioremap_type type)
 127 {
 128         resource_size_t size;
 129         void __iomem *dest_ptr;
 130         char *pretty_name;
 131         int ret;
 132
 133         BUG_ON(!dev);
 134
 135         if (!res || resource_type(res) != IORESOURCE_MEM) {
 136                 ret = dev_err_probe(dev, -EINVAL, "invalid resource %pR\n", res);
 137                 return IOMEM_ERR_PTR(ret);
 138         }
 139
 140         if (type == DEVM_IOREMAP && res->flags & IORESOURCE_MEM_NONPOSTED)
 141                 type = DEVM_IOREMAP_NP;
 142
 143         size = resource_size(res);
 144
 145         if (res->name)
 146                 pretty_name = devm_kasprintf(dev, GFP_KERNEL, "%s %s",
 147                                              dev_name(dev), res->name);
 148         else
 149                 pretty_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
 150         if (!pretty_name) {
 151                 ret = dev_err_probe(dev, -ENOMEM, "can't generate pretty name for resource %pR\n", res);
 152                 return IOMEM_ERR_PTR(ret);
 153         }
 154
 155         if (!devm_request_mem_region(dev, res->start, size, pretty_name)) {
 156                 ret = dev_err_probe(dev, -EBUSY, "can't request region for resource %pR\n", res);
 157                 return IOMEM_ERR_PTR(ret);
 158         }
 159
 160         dest_ptr = __devm_ioremap(dev, res->start, size, type);
 161         if (!dest_ptr) {
 162                 devm_release_mem_region(dev, res->start, size);
 163                 ret = dev_err_probe(dev, -ENOMEM, "ioremap failed for resource %pR\n", res);
 164                 return IOMEM_ERR_PTR(ret);
 165         }
 166
 167         return dest_ptr;
 168 }
 169
 170 /**
 171  * devm_ioremap_resource() - check, request region, and ioremap resource
 172  * @dev: generic device to handle the resource for
 173  * @res: resource to be handled
 174  *
 175  * Checks that a resource is a valid memory region, requests the memory
 176  * region and ioremaps it. All operations are managed and will be undone
 177  * on driver detach.
 178  *
 179  * Usage example:
 180  *
 181  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 182  *      base = devm_ioremap_resource(&pdev->dev, res);
 183  *      if (IS_ERR(base))
 184  *              return PTR_ERR(base);
 185  *
 186  * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
 187  * on failure.
 188  */
 189 void __iomem *devm_ioremap_resource(struct device *dev,
 190                                     const struct resource *res)
 191 {
 192         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP);
 193 }
 194 EXPORT_SYMBOL(devm_ioremap_resource);
 195
 196 /**
 197  * devm_ioremap_resource_wc() - write-combined variant of
 198  *                              devm_ioremap_resource()
 199  * @dev: generic device to handle the resource for
 200  * @res: resource to be handled
 201  *
 202  * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code
 203  * on failure.
 204  */
 205 void __iomem *devm_ioremap_resource_wc(struct device *dev,
 206                                        const struct resource *res)
 207 {
 208         return __devm_ioremap_resource(dev, res, DEVM_IOREMAP_WC);
 209 }
 210
 211 /*
 212  * devm_of_iomap - Requests a resource and maps the memory mapped IO
 213  *                 for a given device_node managed by a given device
 214  *
 215  * Checks that a resource is a valid memory region, requests the memory
 216  * region and ioremaps it. All operations are managed and will be undone
 217  * on driver detach of the device.
 218  *
 219  * This is to be used when a device requests/maps resources described
 220  * by other device tree nodes (children or otherwise).
 221  *
 222  * @dev:        The device "managing" the resource
 223  * @node:       The device-tree node where the resource resides
 224  * @index:      index of the MMIO range in the "reg" property
 225  * @size:       Returns the size of the resource (pass NULL if not needed)
 226  *
 227  * Usage example:
 228  *
 229  *      base = devm_of_iomap(&pdev->dev, node, 0, NULL);
 230  *      if (IS_ERR(base))
 231  *              return PTR_ERR(base);
 232  *
 233  * Please Note: This is not a one-to-one replacement for of_iomap() because the
 234  * of_iomap() function does not track whether the region is already mapped.  If
 235  * two drivers try to map the same memory, the of_iomap() function will succeed
 236  * but the devm_of_iomap() function will return -EBUSY.
 237  *
 238  * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded
 239  * error code on failure.
 240  */
 241 void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index,
 242                             resource_size_t *size)
 243 {
 244         struct resource res;
 245
 246         if (of_address_to_resource(node, index, &res))
 247                 return IOMEM_ERR_PTR(-EINVAL);
 248         if (size)
 249                 *size = resource_size(&res);
 250         return devm_ioremap_resource(dev, &res);
 251 }
 252 EXPORT_SYMBOL(devm_of_iomap);
 253
 254 #ifdef CONFIG_HAS_IOPORT_MAP
 255 /*
 256  * Generic iomap devres
 257  */
 258 static void devm_ioport_map_release(struct device *dev, void *res)
 259 {
 260         ioport_unmap(*(void __iomem **)res);
 261 }
 262
 263 static int devm_ioport_map_match(struct device *dev, void *res,
 264                                  void *match_data)
 265 {
 266         return *(void **)res == match_data;
 267 }
 268
 269 /**
 270  * devm_ioport_map - Managed ioport_map()
 271  * @dev: Generic device to map ioport for
 272  * @port: Port to map
 273  * @nr: Number of ports to map
 274  *
 275  * Managed ioport_map().  Map is automatically unmapped on driver
 276  * detach.
 277  *
 278  * Return: a pointer to the remapped memory or NULL on failure.
 279  */
 280 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 281                                unsigned int nr)
 282 {
 283         void __iomem **ptr, *addr;
 284
 285         ptr = devres_alloc_node(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL,
 286                                 dev_to_node(dev));
 287         if (!ptr)
 288                 return NULL;
 289
 290         addr = ioport_map(port, nr);
 291         if (addr) {
 292                 *ptr = addr;
 293                 devres_add(dev, ptr);
 294         } else
 295                 devres_free(ptr);
 296
 297         return addr;
 298 }
 299 EXPORT_SYMBOL(devm_ioport_map);
 300
 301 /**
 302  * devm_ioport_unmap - Managed ioport_unmap()
 303  * @dev: Generic device to unmap for
 304  * @addr: Address to unmap
 305  *
 306  * Managed ioport_unmap().  @addr must have been mapped using
 307  * devm_ioport_map().
 308  */
 309 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 310 {
 311         ioport_unmap(addr);
 312         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 313                                devm_ioport_map_match, (__force void *)addr));
 314 }
 315 EXPORT_SYMBOL(devm_ioport_unmap);
 316 #endif /* CONFIG_HAS_IOPORT_MAP */
 317
 318 static void devm_arch_phys_ac_add_release(struct device *dev, void *res)
 319 {
 320         arch_phys_wc_del(*((int *)res));
 321 }
 322
 323 /**
 324  * devm_arch_phys_wc_add - Managed arch_phys_wc_add()
 325  * @dev: Managed device
 326  * @base: Memory base address
 327  * @size: Size of memory range
 328  *
 329  * Adds a WC MTRR using arch_phys_wc_add() and sets up a release callback.
 330  * See arch_phys_wc_add() for more information.
 331  */
 332 int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size)
 333 {
 334         int *mtrr;
 335         int ret;
 336
 337         mtrr = devres_alloc_node(devm_arch_phys_ac_add_release, sizeof(*mtrr), GFP_KERNEL,
 338                                  dev_to_node(dev));
 339         if (!mtrr)
 340                 return -ENOMEM;
 341
 342         ret = arch_phys_wc_add(base, size);
 343         if (ret < 0) {
 344                 devres_free(mtrr);
 345                 return ret;
 346         }
 347
 348         *mtrr = ret;
 349         devres_add(dev, mtrr);
 350
 351         return ret;
 352 }
 353 EXPORT_SYMBOL(devm_arch_phys_wc_add);
 354
 355 struct arch_io_reserve_memtype_wc_devres {
 356         resource_size_t start;
 357         resource_size_t size;
 358 };
 359
 360 static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)
 361 {
 362         const struct arch_io_reserve_memtype_wc_devres *this = res;
 363
 364         arch_io_free_memtype_wc(this->start, this->size);
 365 }
 366
 367 /**
 368  * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()
 369  * @dev: Managed device
 370  * @start: Memory base address
 371  * @size: Size of memory range
 372  *
 373  * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()
 374  * and sets up a release callback See arch_io_reserve_memtype_wc() for more
 375  * information.
 376  */
 377 int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
 378                                     resource_size_t size)
 379 {
 380         struct arch_io_reserve_memtype_wc_devres *dr;
 381         int ret;
 382
 383         dr = devres_alloc_node(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL,
 384                                dev_to_node(dev));
 385         if (!dr)
 386                 return -ENOMEM;
 387
 388         ret = arch_io_reserve_memtype_wc(start, size);
 389         if (ret < 0) {
 390                 devres_free(dr);
 391                 return ret;
 392         }
 393
 394         dr->start = start;
 395         dr->size = size;
 396         devres_add(dev, dr);
 397
 398         return ret;
 399 }
 400 EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);