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 #ifdef CONFIG_HAS_IOPORT_MAP
 146 /*
 147  * Generic iomap devres
 148  */
 149 static void devm_ioport_map_release(struct device *dev, void *res)
 150 {
 151         ioport_unmap(*(void __iomem **)res);
 152 }
 153
 154 static int devm_ioport_map_match(struct device *dev, void *res,
 155                                  void *match_data)
 156 {
 157         return *(void **)res == match_data;
 158 }
 159
 160 /**
 161  * devm_ioport_map - Managed ioport_map()
 162  * @dev: Generic device to map ioport for
 163  * @port: Port to map
 164  * @nr: Number of ports to map
 165  *
 166  * Managed ioport_map().  Map is automatically unmapped on driver
 167  * detach.
 168  */
 169 void __iomem *devm_ioport_map(struct device *dev, unsigned long port,
 170                                unsigned int nr)
 171 {
 172         void __iomem **ptr, *addr;
 173
 174         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 175         if (!ptr)
 176                 return NULL;
 177
 178         addr = ioport_map(port, nr);
 179         if (addr) {
 180                 *ptr = addr;
 181                 devres_add(dev, ptr);
 182         } else
 183                 devres_free(ptr);
 184
 185         return addr;
 186 }
 187 EXPORT_SYMBOL(devm_ioport_map);
 188
 189 /**
 190  * devm_ioport_unmap - Managed ioport_unmap()
 191  * @dev: Generic device to unmap for
 192  * @addr: Address to unmap
 193  *
 194  * Managed ioport_unmap().  @addr must have been mapped using
 195  * devm_ioport_map().
 196  */
 197 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 198 {
 199         ioport_unmap(addr);
 200         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 201                                devm_ioport_map_match, (__force void *)addr));
 202 }
 203 EXPORT_SYMBOL(devm_ioport_unmap);
 204 #endif /* CONFIG_HAS_IOPORT_MAP */
 205
 206 #ifdef CONFIG_PCI
 207 /*
 208  * PCI iomap devres
 209  */
 210 #define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 211
 212 struct pcim_iomap_devres {
 213         void __iomem *table[PCIM_IOMAP_MAX];
 214 };
 215
 216 static void pcim_iomap_release(struct device *gendev, void *res)
 217 {
 218         struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 219         struct pcim_iomap_devres *this = res;
 220         int i;
 221
 222         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 223                 if (this->table[i])
 224                         pci_iounmap(dev, this->table[i]);
 225 }
 226
 227 /**
 228  * pcim_iomap_table - access iomap allocation table
 229  * @pdev: PCI device to access iomap table for
 230  *
 231  * Access iomap allocation table for @dev.  If iomap table doesn't
 232  * exist and @pdev is managed, it will be allocated.  All iomaps
 233  * recorded in the iomap table are automatically unmapped on driver
 234  * detach.
 235  *
 236  * This function might sleep when the table is first allocated but can
 237  * be safely called without context and guaranteed to succed once
 238  * allocated.
 239  */
 240 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev)
 241 {
 242         struct pcim_iomap_devres *dr, *new_dr;
 243
 244         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 245         if (dr)
 246                 return dr->table;
 247
 248         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 249         if (!new_dr)
 250                 return NULL;
 251         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 252         return dr->table;
 253 }
 254 EXPORT_SYMBOL(pcim_iomap_table);
 255
 256 /**
 257  * pcim_iomap - Managed pcim_iomap()
 258  * @pdev: PCI device to iomap for
 259  * @bar: BAR to iomap
 260  * @maxlen: Maximum length of iomap
 261  *
 262  * Managed pci_iomap().  Map is automatically unmapped on driver
 263  * detach.
 264  */
 265 void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 266 {
 267         void __iomem **tbl;
 268
 269         BUG_ON(bar >= PCIM_IOMAP_MAX);
 270
 271         tbl = (void __iomem **)pcim_iomap_table(pdev);
 272         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 273                 return NULL;
 274
 275         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 276         return tbl[bar];
 277 }
 278 EXPORT_SYMBOL(pcim_iomap);
 279
 280 /**
 281  * pcim_iounmap - Managed pci_iounmap()
 282  * @pdev: PCI device to iounmap for
 283  * @addr: Address to unmap
 284  *
 285  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 286  */
 287 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 288 {
 289         void __iomem **tbl;
 290         int i;
 291
 292         pci_iounmap(pdev, addr);
 293
 294         tbl = (void __iomem **)pcim_iomap_table(pdev);
 295         BUG_ON(!tbl);
 296
 297         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 298                 if (tbl[i] == addr) {
 299                         tbl[i] = NULL;
 300                         return;
 301                 }
 302         WARN_ON(1);
 303 }
 304 EXPORT_SYMBOL(pcim_iounmap);
 305
 306 /**
 307  * pcim_iomap_regions - Request and iomap PCI BARs
 308  * @pdev: PCI device to map IO resources for
 309  * @mask: Mask of BARs to request and iomap
 310  * @name: Name used when requesting regions
 311  *
 312  * Request and iomap regions specified by @mask.
 313  */
 314 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
 315 {
 316         void __iomem * const *iomap;
 317         int i, rc;
 318
 319         iomap = pcim_iomap_table(pdev);
 320         if (!iomap)
 321                 return -ENOMEM;
 322
 323         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 324                 unsigned long len;
 325
 326                 if (!(mask & (1 << i)))
 327                         continue;
 328
 329                 rc = -EINVAL;
 330                 len = pci_resource_len(pdev, i);
 331                 if (!len)
 332                         goto err_inval;
 333
 334                 rc = pci_request_region(pdev, i, name);
 335                 if (rc)
 336                         goto err_inval;
 337
 338                 rc = -ENOMEM;
 339                 if (!pcim_iomap(pdev, i, 0))
 340                         goto err_region;
 341         }
 342
 343         return 0;
 344
 345  err_region:
 346         pci_release_region(pdev, i);
 347  err_inval:
 348         while (--i >= 0) {
 349                 if (!(mask & (1 << i)))
 350                         continue;
 351                 pcim_iounmap(pdev, iomap[i]);
 352                 pci_release_region(pdev, i);
 353         }
 354
 355         return rc;
 356 }
 357 EXPORT_SYMBOL(pcim_iomap_regions);
 358
 359 /**
 360  * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 361  * @pdev: PCI device to map IO resources for
 362  * @mask: Mask of BARs to iomap
 363  * @name: Name used when requesting regions
 364  *
 365  * Request all PCI BARs and iomap regions specified by @mask.
 366  */
 367 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 368                                    const char *name)
 369 {
 370         int request_mask = ((1 << 6) - 1) & ~mask;
 371         int rc;
 372
 373         rc = pci_request_selected_regions(pdev, request_mask, name);
 374         if (rc)
 375                 return rc;
 376
 377         rc = pcim_iomap_regions(pdev, mask, name);
 378         if (rc)
 379                 pci_release_selected_regions(pdev, request_mask);
 380         return rc;
 381 }
 382 EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 383
 384 /**
 385  * pcim_iounmap_regions - Unmap and release PCI BARs
 386  * @pdev: PCI device to map IO resources for
 387  * @mask: Mask of BARs to unmap and release
 388  *
 389  * Unmap and release regions specified by @mask.
 390  */
 391 void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 392 {
 393         void __iomem * const *iomap;
 394         int i;
 395
 396         iomap = pcim_iomap_table(pdev);
 397         if (!iomap)
 398                 return;
 399
 400         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 401                 if (!(mask & (1 << i)))
 402                         continue;
 403
 404                 pcim_iounmap(pdev, iomap[i]);
 405                 pci_release_region(pdev, i);
 406         }
 407 }
 408 EXPORT_SYMBOL(pcim_iounmap_regions);
 409 #endif /* CONFIG_PCI */