lib/devres.c

   1 #include <linux/pci.h>
   2 #include <linux/io.h>
   3 #include <linux/gfp.h>
   4 #include <linux/module.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_request_and_ioremap() - Check, request region, and ioremap resource
  90  * @dev: Generic device to handle the resource for
  91  * @res: resource to be handled
  92  *
  93  * Takes all necessary steps to ioremap a mem resource. Uses managed device, so
  94  * everything is undone on driver detach. Checks arguments, so you can feed
  95  * it the result from e.g. platform_get_resource() directly. Returns the
  96  * remapped pointer or NULL on error. Usage example:
  97  *
  98  *      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  99  *      base = devm_request_and_ioremap(&pdev->dev, res);
 100  *      if (!base)
 101  *              return -EADDRNOTAVAIL;
 102  */
 103 void __iomem *devm_request_and_ioremap(struct device *dev,
 104                         struct resource *res)
 105 {
 106         resource_size_t size;
 107         const char *name;
 108         void __iomem *dest_ptr;
 109
 110         BUG_ON(!dev);
 111
 112         if (!res || resource_type(res) != IORESOURCE_MEM) {
 113                 dev_err(dev, "invalid resource\n");
 114                 return NULL;
 115         }
 116
 117         size = resource_size(res);
 118         name = res->name ?: dev_name(dev);
 119
 120         if (!devm_request_mem_region(dev, res->start, size, name)) {
 121                 dev_err(dev, "can't request region for resource %pR\n", res);
 122                 return NULL;
 123         }
 124
 125         if (res->flags & IORESOURCE_CACHEABLE)
 126                 dest_ptr = devm_ioremap(dev, res->start, size);
 127         else
 128                 dest_ptr = devm_ioremap_nocache(dev, res->start, size);
 129
 130         if (!dest_ptr) {
 131                 dev_err(dev, "ioremap failed for resource %pR\n", res);
 132                 devm_release_mem_region(dev, res->start, size);
 133         }
 134
 135         return dest_ptr;
 136 }
 137 EXPORT_SYMBOL(devm_request_and_ioremap);
 138
 139 #ifdef CONFIG_HAS_IOPORT
 140 /*
 141  * Generic iomap devres
 142  */
 143 static void devm_ioport_map_release(struct device *dev, void *res)
 144 {
 145         ioport_unmap(*(void __iomem **)res);
 146 }
 147
 148 static int devm_ioport_map_match(struct device *dev, void *res,
 149                                  void *match_data)
 150 {
 151         return *(void **)res == match_data;
 152 }
 153
 154 /**
 155  * devm_ioport_map - Managed ioport_map()
 156  * @dev: Generic device to map ioport for
 157  * @port: Port to map
 158  * @nr: Number of ports to map
 159  *
 160  * Managed ioport_map().  Map is automatically unmapped on driver
 161  * detach.
 162  */
 163 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 164                                unsigned int nr)
 165 {
 166         void __iomem **ptr, *addr;
 167
 168         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 169         if (!ptr)
 170                 return NULL;
 171
 172         addr = ioport_map(port, nr);
 173         if (addr) {
 174                 *ptr = addr;
 175                 devres_add(dev, ptr);
 176         } else
 177                 devres_free(ptr);
 178
 179         return addr;
 180 }
 181 EXPORT_SYMBOL(devm_ioport_map);
 182
 183 /**
 184  * devm_ioport_unmap - Managed ioport_unmap()
 185  * @dev: Generic device to unmap for
 186  * @addr: Address to unmap
 187  *
 188  * Managed ioport_unmap().  @addr must have been mapped using
 189  * devm_ioport_map().
 190  */
 191 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 192 {
 193         ioport_unmap(addr);
 194         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 195                                devm_ioport_map_match, (void *)addr));
 196 }
 197 EXPORT_SYMBOL(devm_ioport_unmap);
 198
 199 #ifdef CONFIG_PCI
 200 /*
 201  * PCI iomap devres
 202  */
 203 #define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 204
 205 struct pcim_iomap_devres {
 206         void __iomem *table[PCIM_IOMAP_MAX];
 207 };
 208
 209 static void pcim_iomap_release(struct device *gendev, void *res)
 210 {
 211         struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 212         struct pcim_iomap_devres *this = res;
 213         int i;
 214
 215         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 216                 if (this->table[i])
 217                         pci_iounmap(dev, this->table[i]);
 218 }
 219
 220 /**
 221  * pcim_iomap_table - access iomap allocation table
 222  * @pdev: PCI device to access iomap table for
 223  *
 224  * Access iomap allocation table for @dev.  If iomap table doesn't
 225  * exist and @pdev is managed, it will be allocated.  All iomaps
 226  * recorded in the iomap table are automatically unmapped on driver
 227  * detach.
 228  *
 229  * This function might sleep when the table is first allocated but can
 230  * be safely called without context and guaranteed to succed once
 231  * allocated.
 232  */
 233 void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
 234 {
 235         struct pcim_iomap_devres *dr, *new_dr;
 236
 237         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 238         if (dr)
 239                 return dr->table;
 240
 241         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 242         if (!new_dr)
 243                 return NULL;
 244         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 245         return dr->table;
 246 }
 247 EXPORT_SYMBOL(pcim_iomap_table);
 248
 249 /**
 250  * pcim_iomap - Managed pcim_iomap()
 251  * @pdev: PCI device to iomap for
 252  * @bar: BAR to iomap
 253  * @maxlen: Maximum length of iomap
 254  *
 255  * Managed pci_iomap().  Map is automatically unmapped on driver
 256  * detach.
 257  */
 258 void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 259 {
 260         void __iomem **tbl;
 261
 262         BUG_ON(bar >= PCIM_IOMAP_MAX);
 263
 264         tbl = (void __iomem **)pcim_iomap_table(pdev);
 265         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 266                 return NULL;
 267
 268         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 269         return tbl[bar];
 270 }
 271 EXPORT_SYMBOL(pcim_iomap);
 272
 273 /**
 274  * pcim_iounmap - Managed pci_iounmap()
 275  * @pdev: PCI device to iounmap for
 276  * @addr: Address to unmap
 277  *
 278  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 279  */
 280 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 281 {
 282         void __iomem **tbl;
 283         int i;
 284
 285         pci_iounmap(pdev, addr);
 286
 287         tbl = (void __iomem **)pcim_iomap_table(pdev);
 288         BUG_ON(!tbl);
 289
 290         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 291                 if (tbl[i] == addr) {
 292                         tbl[i] = NULL;
 293                         return;
 294                 }
 295         WARN_ON(1);
 296 }
 297 EXPORT_SYMBOL(pcim_iounmap);
 298
 299 /**
 300  * pcim_iomap_regions - Request and iomap PCI BARs
 301  * @pdev: PCI device to map IO resources for
 302  * @mask: Mask of BARs to request and iomap
 303  * @name: Name used when requesting regions
 304  *
 305  * Request and iomap regions specified by @mask.
 306  */
 307 int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
 308 {
 309         void __iomem * const *iomap;
 310         int i, rc;
 311
 312         iomap = pcim_iomap_table(pdev);
 313         if (!iomap)
 314                 return -ENOMEM;
 315
 316         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 317                 unsigned long len;
 318
 319                 if (!(mask & (1 << i)))
 320                         continue;
 321
 322                 rc = -EINVAL;
 323                 len = pci_resource_len(pdev, i);
 324                 if (!len)
 325                         goto err_inval;
 326
 327                 rc = pci_request_region(pdev, i, name);
 328                 if (rc)
 329                         goto err_inval;
 330
 331                 rc = -ENOMEM;
 332                 if (!pcim_iomap(pdev, i, 0))
 333                         goto err_region;
 334         }
 335
 336         return 0;
 337
 338  err_region:
 339         pci_release_region(pdev, i);
 340  err_inval:
 341         while (--i >= 0) {
 342                 if (!(mask & (1 << i)))
 343                         continue;
 344                 pcim_iounmap(pdev, iomap[i]);
 345                 pci_release_region(pdev, i);
 346         }
 347
 348         return rc;
 349 }
 350 EXPORT_SYMBOL(pcim_iomap_regions);
 351
 352 /**
 353  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 354  * @pdev: PCI device to map IO resources for
 355  * @mask: Mask of BARs to iomap
 356  * @name: Name used when requesting regions
 357  *
 358  * Request all PCI BARs and iomap regions specified by @mask.
 359  */
 360 int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
 361                                    const char *name)
 362 {
 363         int request_mask = ((1 << 6) - 1) & ~mask;
 364         int rc;
 365
 366         rc = pci_request_selected_regions(pdev, request_mask, name);
 367         if (rc)
 368                 return rc;
 369
 370         rc = pcim_iomap_regions(pdev, mask, name);
 371         if (rc)
 372                 pci_release_selected_regions(pdev, request_mask);
 373         return rc;
 374 }
 375 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 376
 377 /**
 378  * pcim_iounmap_regions - Unmap and release PCI BARs
 379  * @pdev: PCI device to map IO resources for
 380  * @mask: Mask of BARs to unmap and release
 381  *
 382  * Unmap and release regions specified by @mask.
 383  */
 384 void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
 385 {
 386         void __iomem * const *iomap;
 387         int i;
 388
 389         iomap = pcim_iomap_table(pdev);
 390         if (!iomap)
 391                 return;
 392
 393         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 394                 if (!(mask & (1 << i)))
 395                         continue;
 396
 397                 pcim_iounmap(pdev, iomap[i]);
 398                 pci_release_region(pdev, i);
 399         }
 400 }
 401 EXPORT_SYMBOL(pcim_iounmap_regions);
 402 #endif /* CONFIG_PCI */
 403 #endif /* CONFIG_HAS_IOPORT */