lib/devres.c

   1 #include <linux/pci.h>
   2 #include <linux/io.h>
   3 #include <linux/gfp.h>
   4 #include <linux/export.h>
   5
   6 void devm_ioremap_release(struct device *dev, void *res)
   7 {
   8         iounmap(*(void __iomem **)res);
   9 }
  10
  11 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  12 {
  13         return *(void **)res == match_data;
  14 }
  15
  16 /**
  17  * devm_ioremap - Managed ioremap()
  18  * @dev: Generic device to remap IO address for
  19  * @offset: BUS offset to map
  20  * @size: Size of map
  21  *
  22  * Managed ioremap().  Map is automatically unmapped on driver detach.
  23  */
  24 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  25                            unsigned long size)
  26 {
  27         void __iomem **ptr, *addr;
  28
  29         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  30         if (!ptr)
  31                 return NULL;
  32
  33         addr = ioremap(offset, size);
  34         if (addr) {
  35                 *ptr = addr;
  36                 devres_add(dev, ptr);
  37         } else
  38                 devres_free(ptr);
  39
  40         return addr;
  41 }
  42 EXPORT_SYMBOL(devm_ioremap);
  43
  44 /**
  45  * devm_ioremap_nocache - Managed ioremap_nocache()
  46  * @dev: Generic device to remap IO address for
  47  * @offset: BUS offset to map
  48  * @size: Size of map
  49  *
  50  * Managed ioremap_nocache().  Map is automatically unmapped on driver
  51  * detach.
  52  */
  53 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  54                                    unsigned long size)
  55 {
  56         void __iomem **ptr, *addr;
  57
  58         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  59         if (!ptr)
  60                 return NULL;
  61
  62         addr = ioremap_nocache(offset, size);
  63         if (addr) {
  64                 *ptr = addr;
  65                 devres_add(dev, ptr);
  66         } else
  67                 devres_free(ptr);
  68
  69         return addr;
  70 }
  71 EXPORT_SYMBOL(devm_ioremap_nocache);
  72
  73 /**
  74  * devm_iounmap - Managed iounmap()
  75  * @dev: Generic device to unmap for
  76  * @addr: Address to unmap
  77  *
  78  * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
  79  */
  80 void devm_iounmap(struct device *dev, void __iomem *addr)
  81 {
  82         WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
  83                                (void *)addr));
  84         iounmap(addr);
  85 }
  86 EXPORT_SYMBOL(devm_iounmap);
  87
  88 /**
  89  * devm_ioremap_resource() - check, request region, and ioremap resource
  90  * @dev: generic device to handle the resource for
  91  * @res: resource to be handled
  92  *
  93  * Checks that a resource is a valid memory region, requests the memory region
  94  * and ioremaps it either as cacheable or as non-cacheable memory depending on
  95  * the resource's flags. All operations are managed and will be undone on
  96  * driver detach.
  97  *
  98  * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
  99  * on failure. Usage example:
 100  *
 101  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 102  *      base = devm_ioremap_resource(&pdev->dev, res);
 103  *      if (IS_ERR(base))
 104  *              return PTR_ERR(base);
 105  */
 106 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 107 {
 108         resource_size_t size;
 109         const char *name;
 110         void __iomem *dest_ptr;
 111
 112         BUG_ON(!dev);
 113
 114         if (!res || resource_type(res) != IORESOURCE_MEM) {
 115                 dev_err(dev, "invalid resource\n");
 116                 return ERR_PTR(-EINVAL);
 117         }
 118
 119         size = resource_size(res);
 120         name = res->name ?: dev_name(dev);
 121
 122         if (!devm_request_mem_region(dev, res->start, size, name)) {
 123                 dev_err(dev, "can't request region for resource %pR\n", res);
 124                 return ERR_PTR(-EBUSY);
 125         }
 126
 127         if (res->flags & IORESOURCE_CACHEABLE)
 128                 dest_ptr = devm_ioremap(dev, res->start, size);
 129         else
 130                 dest_ptr = devm_ioremap_nocache(dev, res->start, size);
 131
 132         if (!dest_ptr) {
 133                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 134                 devm_release_mem_region(dev, res->start, size);
 135                 dest_ptr = ERR_PTR(-ENOMEM);
 136         }
 137
 138         return dest_ptr;
 139 }
 140 EXPORT_SYMBOL(devm_ioremap_resource);
 141
 142 /**
 143  * devm_request_and_ioremap() - Check, request region, and ioremap resource
 144  * @dev: Generic device to handle the resource for
 145  * @res: resource to be handled
 146  *
 147  * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
 148  * everything is undone on driver detach. Checks arguments, so you can feed
 149  * it the result from e.g. platform_get_resource() directly. Returns the
 150  * remapped pointer or NULL on error. Usage example:
 151  *
 152  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 153  *      base = devm_request_and_ioremap(&pdev->dev, res);
 154  *      if (!base)
 155  *              return -EADDRNOTAVAIL;
 156  */
 157 void __iomem *devm_request_and_ioremap(struct device *device,
 158                                        struct resource *res)
 159 {
 160         void __iomem *dest_ptr;
 161
 162         dest_ptr = devm_ioremap_resource(device, res);
 163         if (IS_ERR(dest_ptr))
 164                 return NULL;
 165
 166         return dest_ptr;
 167 }
 168 EXPORT_SYMBOL(devm_request_and_ioremap);
 169
 170 #ifdef CONFIG_HAS_IOPORT
 171 /*
 172  * Generic iomap devres
 173  */
 174 static void devm_ioport_map_release(struct device *dev, void *res)
 175 {
 176         ioport_unmap(*(void __iomem **)res);
 177 }
 178
 179 static int devm_ioport_map_match(struct device *dev, void *res,
 180                                  void *match_data)
 181 {
 182         return *(void **)res == match_data;
 183 }
 184
 185 /**
 186  * devm_ioport_map - Managed ioport_map()
 187  * @dev: Generic device to map ioport for
 188  * @port: Port to map
 189  * @nr: Number of ports to map
 190  *
 191  * Managed ioport_map().  Map is automatically unmapped on driver
 192  * detach.
 193  */
 194 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 195                                unsigned int nr)
 196 {
 197         void __iomem **ptr, *addr;
 198
 199         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 200         if (!ptr)
 201                 return NULL;
 202
 203         addr = ioport_map(port, nr);
 204         if (addr) {
 205                 *ptr = addr;
 206                 devres_add(dev, ptr);
 207         } else
 208                 devres_free(ptr);
 209
 210         return addr;
 211 }
 212 EXPORT_SYMBOL(devm_ioport_map);
 213
 214 /**
 215  * devm_ioport_unmap - Managed ioport_unmap()
 216  * @dev: Generic device to unmap for
 217  * @addr: Address to unmap
 218  *
 219  * Managed ioport_unmap().  @addr must have been mapped using
 220  * devm_ioport_map().
 221  */
 222 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 223 {
 224         ioport_unmap(addr);
 225         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 226                                devm_ioport_map_match, (void *)addr));
 227 }
 228 EXPORT_SYMBOL(devm_ioport_unmap);
 229
 230 #ifdef CONFIG_PCI
 231 /*
 232  * PCI iomap devres
 233  */
 234 #define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 235
 236 struct pcim_iomap_devres {
 237         void __iomem *table[PCIM_IOMAP_MAX];
 238 };
 239
 240 static void pcim_iomap_release(struct device *gendev, void *res)
 241 {
 242         struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 243         struct pcim_iomap_devres *this = res;
 244         int i;
 245
 246         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 247                 if (this->table[i])
 248                         pci_iounmap(dev, this->table[i]);
 249 }
 250
 251 /**
 252  * pcim_iomap_table - access iomap allocation table
 253  * @pdev: PCI device to access iomap table for
 254  *
 255  * Access iomap allocation table for @dev.  If iomap table doesn't
 256  * exist and @pdev is managed, it will be allocated.  All iomaps
 257  * recorded in the iomap table are automatically unmapped on driver
 258  * detach.
 259  *
 260  * This function might sleep when the table is first allocated but can
 261  * be safely called without context and guaranteed to succed once
 262  * allocated.
 263  */
 264 void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
 265 {
 266         struct pcim_iomap_devres *dr, *new_dr;
 267
 268         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 269         if (dr)
 270                 return dr->table;
 271
 272         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 273         if (!new_dr)
 274                 return NULL;
 275         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 276         return dr->table;
 277 }
 278 EXPORT_SYMBOL(pcim_iomap_table);
 279
 280 /**
 281  * pcim_iomap - Managed pcim_iomap()
 282  * @pdev: PCI device to iomap for
 283  * @bar: BAR to iomap
 284  * @maxlen: Maximum length of iomap
 285  *
 286  * Managed pci_iomap().  Map is automatically unmapped on driver
 287  * detach.
 288  */
 289 void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 290 {
 291         void __iomem **tbl;
 292
 293         BUG_ON(bar >= PCIM_IOMAP_MAX);
 294
 295         tbl = (void __iomem **)pcim_iomap_table(pdev);
 296         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 297                 return NULL;
 298
 299         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 300         return tbl[bar];
 301 }
 302 EXPORT_SYMBOL(pcim_iomap);
 303
 304 /**
 305  * pcim_iounmap - Managed pci_iounmap()
 306  * @pdev: PCI device to iounmap for
 307  * @addr: Address to unmap
 308  *
 309  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 310  */
 311 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 312 {
 313         void __iomem **tbl;
 314         int i;
 315
 316         pci_iounmap(pdev, addr);
 317
 318         tbl = (void __iomem **)pcim_iomap_table(pdev);
 319         BUG_ON(!tbl);
 320
 321         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 322                 if (tbl[i] == addr) {
 323                         tbl[i] = NULL;
 324                         return;
 325                 }
 326         WARN_ON(1);
 327 }
 328 EXPORT_SYMBOL(pcim_iounmap);
 329
 330 /**
 331  * pcim_iomap_regions - Request and iomap PCI BARs
 332  * @pdev: PCI device to map IO resources for
 333  * @mask: Mask of BARs to request and iomap
 334  * @name: Name used when requesting regions
 335  *
 336  * Request and iomap regions specified by @mask.
 337  */
 338 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 339 {
 340         void __iomem * const *iomap;
 341         int i, rc;
 342
 343         iomap = pcim_iomap_table(pdev);
 344         if (!iomap)
 345                 return -ENOMEM;
 346
 347         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 348                 unsigned long len;
 349
 350                 if (!(mask & (1 << i)))
 351                         continue;
 352
 353                 rc = -EINVAL;
 354                 len = pci_resource_len(pdev, i);
 355                 if (!len)
 356                         goto err_inval;
 357
 358                 rc = pci_request_region(pdev, i, name);
 359                 if (rc)
 360                         goto err_inval;
 361
 362                 rc = -ENOMEM;
 363                 if (!pcim_iomap(pdev, i, 0))
 364                         goto err_region;
 365         }
 366
 367         return 0;
 368
 369  err_region:
 370         pci_release_region(pdev, i);
 371  err_inval:
 372         while (--i >= 0) {
 373                 if (!(mask & (1 << i)))
 374                         continue;
 375                 pcim_iounmap(pdev, iomap[i]);
 376                 pci_release_region(pdev, i);
 377         }
 378
 379         return rc;
 380 }
 381 EXPORT_SYMBOL(pcim_iomap_regions);
 382
 383 /**
 384  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 385  * @pdev: PCI device to map IO resources for
 386  * @mask: Mask of BARs to iomap
 387  * @name: Name used when requesting regions
 388  *
 389  * Request all PCI BARs and iomap regions specified by @mask.
 390  */
 391 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 392                                    const char *name)
 393 {
 394         int request_mask = ((1 << 6) - 1) & ~mask;
 395         int rc;
 396
 397         rc = pci_request_selected_regions(pdev, request_mask, name);
 398         if (rc)
 399                 return rc;
 400
 401         rc = pcim_iomap_regions(pdev, mask, name);
 402         if (rc)
 403                 pci_release_selected_regions(pdev, request_mask);
 404         return rc;
 405 }
 406 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 407
 408 /**
 409  * pcim_iounmap_regions - Unmap and release PCI BARs
 410  * @pdev: PCI device to map IO resources for
 411  * @mask: Mask of BARs to unmap and release
 412  *
 413  * Unmap and release regions specified by @mask.
 414  */
 415 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 416 {
 417         void __iomem * const *iomap;
 418         int i;
 419
 420         iomap = pcim_iomap_table(pdev);
 421         if (!iomap)
 422                 return;
 423
 424         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 425                 if (!(mask & (1 << i)))
 426                         continue;
 427
 428                 pcim_iounmap(pdev, iomap[i]);
 429                 pci_release_region(pdev, i);
 430         }
 431 }
 432 EXPORT_SYMBOL(pcim_iounmap_regions);
 433 #endif /* CONFIG_PCI */
 434 #endif /* CONFIG_HAS_IOPORT */