lib/devres.c

   1 #include <linux/err.h>
   2 #include <linux/pci.h>
   3 #include <linux/io.h>
   4 #include <linux/gfp.h>
   5 #include <linux/export.h>
   6
   7 void devm_ioremap_release(struct device *dev, void *res)
   8 {
   9         iounmap(*(void __iomem **)res);
  10 }
  11
  12 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  13 {
  14         return *(void **)res == match_data;
  15 }
  16
  17 /**
  18  * devm_ioremap - Managed ioremap()
  19  * @dev: Generic device to remap IO address for
  20  * @offset: BUS offset to map
  21  * @size: Size of map
  22  *
  23  * Managed ioremap().  Map is automatically unmapped on driver detach.
  24  */
  25 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  26                            unsigned long size)
  27 {
  28         void __iomem **ptr, *addr;
  29
  30         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  31         if (!ptr)
  32                 return NULL;
  33
  34         addr = ioremap(offset, size);
  35         if (addr) {
  36                 *ptr = addr;
  37                 devres_add(dev, ptr);
  38         } else
  39                 devres_free(ptr);
  40
  41         return addr;
  42 }
  43 EXPORT_SYMBOL(devm_ioremap);
  44
  45 /**
  46  * devm_ioremap_nocache - Managed ioremap_nocache()
  47  * @dev: Generic device to remap IO address for
  48  * @offset: BUS offset to map
  49  * @size: Size of map
  50  *
  51  * Managed ioremap_nocache().  Map is automatically unmapped on driver
  52  * detach.
  53  */
  54 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  55                                    unsigned long size)
  56 {
  57         void __iomem **ptr, *addr;
  58
  59         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  60         if (!ptr)
  61                 return NULL;
  62
  63         addr = ioremap_nocache(offset, size);
  64         if (addr) {
  65                 *ptr = addr;
  66                 devres_add(dev, ptr);
  67         } else
  68                 devres_free(ptr);
  69
  70         return addr;
  71 }
  72 EXPORT_SYMBOL(devm_ioremap_nocache);
  73
  74 /**
  75  * devm_iounmap - Managed iounmap()
  76  * @dev: Generic device to unmap for
  77  * @addr: Address to unmap
  78  *
  79  * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
  80  */
  81 void devm_iounmap(struct device *dev, void __iomem *addr)
  82 {
  83         WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
  84                                (__force void *)addr));
  85         iounmap(addr);
  86 }
  87 EXPORT_SYMBOL(devm_iounmap);
  88
  89 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
  90
  91 /**
  92  * devm_ioremap_resource() - check, request region, and ioremap resource
  93  * @dev: generic device to handle the resource for
  94  * @res: resource to be handled
  95  *
  96  * Checks that a resource is a valid memory region, requests the memory region
  97  * and ioremaps it either as cacheable or as non-cacheable memory depending on
  98  * the resource's flags. All operations are managed and will be undone on
  99  * driver detach.
 100  *
 101  * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
 102  * on failure. Usage example:
 103  *
 104  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 105  *      base = devm_ioremap_resource(&pdev->dev, res);
 106  *      if (IS_ERR(base))
 107  *              return PTR_ERR(base);
 108  */
 109 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
 110 {
 111         resource_size_t size;
 112         const char *name;
 113         void __iomem *dest_ptr;
 114
 115         BUG_ON(!dev);
 116
 117         if (!res || resource_type(res) != IORESOURCE_MEM) {
 118                 dev_err(dev, "invalid resource\n");
 119                 return IOMEM_ERR_PTR(-EINVAL);
 120         }
 121
 122         size = resource_size(res);
 123         name = res->name ?: dev_name(dev);
 124
 125         if (!devm_request_mem_region(dev, res->start, size, name)) {
 126                 dev_err(dev, "can't request region for resource %pR\n", res);
 127                 return IOMEM_ERR_PTR(-EBUSY);
 128         }
 129
 130         if (res->flags & IORESOURCE_CACHEABLE)
 131                 dest_ptr = devm_ioremap(dev, res->start, size);
 132         else
 133                 dest_ptr = devm_ioremap_nocache(dev, res->start, size);
 134
 135         if (!dest_ptr) {
 136                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 137                 devm_release_mem_region(dev, res->start, size);
 138                 dest_ptr = IOMEM_ERR_PTR(-ENOMEM);
 139         }
 140
 141         return dest_ptr;
 142 }
 143 EXPORT_SYMBOL(devm_ioremap_resource);
 144
 145 /**
 146  * devm_request_and_ioremap() - Check, request region, and ioremap resource
 147  * @dev: Generic device to handle the resource for
 148  * @res: resource to be handled
 149  *
 150  * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
 151  * everything is undone on driver detach. Checks arguments, so you can feed
 152  * it the result from e.g. platform_get_resource() directly. Returns the
 153  * remapped pointer or NULL on error. Usage example:
 154  *
 155  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 156  *      base = devm_request_and_ioremap(&pdev->dev, res);
 157  *      if (!base)
 158  *              return -EADDRNOTAVAIL;
 159  */
 160 void __iomem *devm_request_and_ioremap(struct device *dev,
 161                                        struct resource *res)
 162 {
 163         void __iomem *dest_ptr;
 164
 165         dest_ptr = devm_ioremap_resource(dev, res);
 166         if (IS_ERR(dest_ptr))
 167                 return NULL;
 168
 169         return dest_ptr;
 170 }
 171 EXPORT_SYMBOL(devm_request_and_ioremap);
 172
 173 #ifdef CONFIG_HAS_IOPORT_MAP
 174 /*
 175  * Generic iomap devres
 176  */
 177 static void devm_ioport_map_release(struct device *dev, void *res)
 178 {
 179         ioport_unmap(*(void __iomem **)res);
 180 }
 181
 182 static int devm_ioport_map_match(struct device *dev, void *res,
 183                                  void *match_data)
 184 {
 185         return *(void **)res == match_data;
 186 }
 187
 188 /**
 189  * devm_ioport_map - Managed ioport_map()
 190  * @dev: Generic device to map ioport for
 191  * @port: Port to map
 192  * @nr: Number of ports to map
 193  *
 194  * Managed ioport_map().  Map is automatically unmapped on driver
 195  * detach.
 196  */
 197 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 198                                unsigned int nr)
 199 {
 200         void __iomem **ptr, *addr;
 201
 202         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 203         if (!ptr)
 204                 return NULL;
 205
 206         addr = ioport_map(port, nr);
 207         if (addr) {
 208                 *ptr = addr;
 209                 devres_add(dev, ptr);
 210         } else
 211                 devres_free(ptr);
 212
 213         return addr;
 214 }
 215 EXPORT_SYMBOL(devm_ioport_map);
 216
 217 /**
 218  * devm_ioport_unmap - Managed ioport_unmap()
 219  * @dev: Generic device to unmap for
 220  * @addr: Address to unmap
 221  *
 222  * Managed ioport_unmap().  @addr must have been mapped using
 223  * devm_ioport_map().
 224  */
 225 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 226 {
 227         ioport_unmap(addr);
 228         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 229                                devm_ioport_map_match, (__force void *)addr));
 230 }
 231 EXPORT_SYMBOL(devm_ioport_unmap);
 232 #endif /* CONFIG_HAS_IOPORT_MAP */
 233
 234 #ifdef CONFIG_PCI
 235 /*
 236  * PCI iomap devres
 237  */
 238 #define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 239
 240 struct pcim_iomap_devres {
 241         void __iomem *table[PCIM_IOMAP_MAX];
 242 };
 243
 244 static void pcim_iomap_release(struct device *gendev, void *res)
 245 {
 246         struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 247         struct pcim_iomap_devres *this = res;
 248         int i;
 249
 250         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 251                 if (this->table[i])
 252                         pci_iounmap(dev, this->table[i]);
 253 }
 254
 255 /**
 256  * pcim_iomap_table - access iomap allocation table
 257  * @pdev: PCI device to access iomap table for
 258  *
 259  * Access iomap allocation table for @dev.  If iomap table doesn't
 260  * exist and @pdev is managed, it will be allocated.  All iomaps
 261  * recorded in the iomap table are automatically unmapped on driver
 262  * detach.
 263  *
 264  * This function might sleep when the table is first allocated but can
 265  * be safely called without context and guaranteed to succed once
 266  * allocated.
 267  */
 268 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 269 {
 270         struct pcim_iomap_devres *dr, *new_dr;
 271
 272         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 273         if (dr)
 274                 return dr->table;
 275
 276         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 277         if (!new_dr)
 278                 return NULL;
 279         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 280         return dr->table;
 281 }
 282 EXPORT_SYMBOL(pcim_iomap_table);
 283
 284 /**
 285  * pcim_iomap - Managed pcim_iomap()
 286  * @pdev: PCI device to iomap for
 287  * @bar: BAR to iomap
 288  * @maxlen: Maximum length of iomap
 289  *
 290  * Managed pci_iomap().  Map is automatically unmapped on driver
 291  * detach.
 292  */
 293 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 294 {
 295         void __iomem **tbl;
 296
 297         BUG_ON(bar >= PCIM_IOMAP_MAX);
 298
 299         tbl = (void __iomem **)pcim_iomap_table(pdev);
 300         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 301                 return NULL;
 302
 303         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 304         return tbl[bar];
 305 }
 306 EXPORT_SYMBOL(pcim_iomap);
 307
 308 /**
 309  * pcim_iounmap - Managed pci_iounmap()
 310  * @pdev: PCI device to iounmap for
 311  * @addr: Address to unmap
 312  *
 313  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 314  */
 315 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 316 {
 317         void __iomem **tbl;
 318         int i;
 319
 320         pci_iounmap(pdev, addr);
 321
 322         tbl = (void __iomem **)pcim_iomap_table(pdev);
 323         BUG_ON(!tbl);
 324
 325         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 326                 if (tbl[i] == addr) {
 327                         tbl[i] = NULL;
 328                         return;
 329                 }
 330         WARN_ON(1);
 331 }
 332 EXPORT_SYMBOL(pcim_iounmap);
 333
 334 /**
 335  * pcim_iomap_regions - Request and iomap PCI BARs
 336  * @pdev: PCI device to map IO resources for
 337  * @mask: Mask of BARs to request and iomap
 338  * @name: Name used when requesting regions
 339  *
 340  * Request and iomap regions specified by @mask.
 341  */
 342 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 343 {
 344         void __iomem * const *iomap;
 345         int i, rc;
 346
 347         iomap = pcim_iomap_table(pdev);
 348         if (!iomap)
 349                 return -ENOMEM;
 350
 351         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 352                 unsigned long len;
 353
 354                 if (!(mask & (1 << i)))
 355                         continue;
 356
 357                 rc = -EINVAL;
 358                 len = pci_resource_len(pdev, i);
 359                 if (!len)
 360                         goto err_inval;
 361
 362                 rc = pci_request_region(pdev, i, name);
 363                 if (rc)
 364                         goto err_inval;
 365
 366                 rc = -ENOMEM;
 367                 if (!pcim_iomap(pdev, i, 0))
 368                         goto err_region;
 369         }
 370
 371         return 0;
 372
 373  err_region:
 374         pci_release_region(pdev, i);
 375  err_inval:
 376         while (--i >= 0) {
 377                 if (!(mask & (1 << i)))
 378                         continue;
 379                 pcim_iounmap(pdev, iomap[i]);
 380                 pci_release_region(pdev, i);
 381         }
 382
 383         return rc;
 384 }
 385 EXPORT_SYMBOL(pcim_iomap_regions);
 386
 387 /**
 388  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 389  * @pdev: PCI device to map IO resources for
 390  * @mask: Mask of BARs to iomap
 391  * @name: Name used when requesting regions
 392  *
 393  * Request all PCI BARs and iomap regions specified by @mask.
 394  */
 395 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 396                                    const char *name)
 397 {
 398         int request_mask = ((1 << 6) - 1) & ~mask;
 399         int rc;
 400
 401         rc = pci_request_selected_regions(pdev, request_mask, name);
 402         if (rc)
 403                 return rc;
 404
 405         rc = pcim_iomap_regions(pdev, mask, name);
 406         if (rc)
 407                 pci_release_selected_regions(pdev, request_mask);
 408         return rc;
 409 }
 410 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 411
 412 /**
 413  * pcim_iounmap_regions - Unmap and release PCI BARs
 414  * @pdev: PCI device to map IO resources for
 415  * @mask: Mask of BARs to unmap and release
 416  *
 417  * Unmap and release regions specified by @mask.
 418  */
 419 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 420 {
 421         void __iomem * const *iomap;
 422         int i;
 423
 424         iomap = pcim_iomap_table(pdev);
 425         if (!iomap)
 426                 return;
 427
 428         for (i = 0; i < PCIM_IOMAP_MAX; i++) {
 429                 if (!(mask & (1 << i)))
 430                         continue;
 431
 432                 pcim_iounmap(pdev, iomap[i]);
 433                 pci_release_region(pdev, i);
 434         }
 435 }
 436 EXPORT_SYMBOL(pcim_iounmap_regions);
 437 #endif /* CONFIG_PCI */