lib/devres.c

   1 #include <linux/pci.h>
   2 #include <linux/io.h>
   3 #include <linux/module.h>
   4
   5 static void devm_ioremap_release(struct device *dev, void *res)
   6 {
   7         iounmap(*(void __iomem **)res);
   8 }
   9
  10 static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  11 {
  12         return *(void **)res == match_data;
  13 }
  14
  15 /**
  16  * devm_ioremap - Managed ioremap()
  17  * @dev: Generic device to remap IO address for
  18  * @offset: BUS offset to map
  19  * @size: Size of map
  20  *
  21  * Managed ioremap().  Map is automatically unmapped on driver detach.
  22  */
  23 void __iomem *devm_ioremap(struct device *dev, unsigned long offset,
  24                            unsigned long size)
  25 {
  26         void __iomem **ptr, *addr;
  27
  28         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  29         if (!ptr)
  30                 return NULL;
  31
  32         addr = ioremap(offset, size);
  33         if (addr) {
  34                 *ptr = addr;
  35                 devres_add(dev, ptr);
  36         } else
  37                 devres_free(ptr);
  38
  39         return addr;
  40 }
  41 EXPORT_SYMBOL(devm_ioremap);
  42
  43 /**
  44  * devm_ioremap_nocache - Managed ioremap_nocache()
  45  * @dev: Generic device to remap IO address for
  46  * @offset: BUS offset to map
  47  * @size: Size of map
  48  *
  49  * Managed ioremap_nocache().  Map is automatically unmapped on driver
  50  * detach.
  51  */
  52 void __iomem *devm_ioremap_nocache(struct device *dev, unsigned long offset,
  53                                    unsigned long size)
  54 {
  55         void __iomem **ptr, *addr;
  56
  57         ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  58         if (!ptr)
  59                 return NULL;
  60
  61         addr = ioremap_nocache(offset, size);
  62         if (addr) {
  63                 *ptr = addr;
  64                 devres_add(dev, ptr);
  65         } else
  66                 devres_free(ptr);
  67
  68         return addr;
  69 }
  70 EXPORT_SYMBOL(devm_ioremap_nocache);
  71
  72 /**
  73  * devm_iounmap - Managed iounmap()
  74  * @dev: Generic device to unmap for
  75  * @addr: Address to unmap
  76  *
  77  * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
  78  */
  79 void devm_iounmap(struct device *dev, void __iomem *addr)
  80 {
  81         iounmap(addr);
  82         WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
  83                                (void *)addr));
  84 }
  85 EXPORT_SYMBOL(devm_iounmap);
  86
  87 #ifdef CONFIG_HAS_IOPORT
  88 /*
  89  * Generic iomap devres
  90  */
  91 static void devm_ioport_map_release(struct device *dev, void *res)
  92 {
  93         ioport_unmap(*(void __iomem **)res);
  94 }
  95
  96 static int devm_ioport_map_match(struct device *dev, void *res,
  97                                  void *match_data)
  98 {
  99         return *(void **)res == match_data;
 100 }
 101
 102 /**
 103  * devm_ioport_map - Managed ioport_map()
 104  * @dev: Generic device to map ioport for
 105  * @port: Port to map
 106  * @nr: Number of ports to map
 107  *
 108  * Managed ioport_map().  Map is automatically unmapped on driver
 109  * detach.
 110  */
 111 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 112                                unsigned int nr)
 113 {
 114         void __iomem **ptr, *addr;
 115
 116         ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 117         if (!ptr)
 118                 return NULL;
 119
 120         addr = ioport_map(port, nr);
 121         if (addr) {
 122                 *ptr = addr;
 123                 devres_add(dev, ptr);
 124         } else
 125                 devres_free(ptr);
 126
 127         return addr;
 128 }
 129 EXPORT_SYMBOL(devm_ioport_map);
 130
 131 /**
 132  * devm_ioport_unmap - Managed ioport_unmap()
 133  * @dev: Generic device to unmap for
 134  * @addr: Address to unmap
 135  *
 136  * Managed ioport_unmap().  @addr must have been mapped using
 137  * devm_ioport_map().
 138  */
 139 void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 140 {
 141         ioport_unmap(addr);
 142         WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 143                                devm_ioport_map_match, (void *)addr));
 144 }
 145 EXPORT_SYMBOL(devm_ioport_unmap);
 146
 147 #ifdef CONFIG_PCI
 148 /*
 149  * PCI iomap devres
 150  */
 151 #define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 152
 153 struct pcim_iomap_devres {
 154         void __iomem *table[PCIM_IOMAP_MAX];
 155 };
 156
 157 static void pcim_iomap_release(struct device *gendev, void *res)
 158 {
 159         struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 160         struct pcim_iomap_devres *this = res;
 161         int i;
 162
 163         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 164                 if (this->table[i])
 165                         pci_iounmap(dev, this->table[i]);
 166 }
 167
 168 /**
 169  * pcim_iomap_table - access iomap allocation table
 170  * @pdev: PCI device to access iomap table for
 171  *
 172  * Access iomap allocation table for @dev.  If iomap table doesn't
 173  * exist and @pdev is managed, it will be allocated.  All iomaps
 174  * recorded in the iomap table are automatically unmapped on driver
 175  * detach.
 176  *
 177  * This function might sleep when the table is first allocated but can
 178  * be safely called without context and guaranteed to succed once
 179  * allocated.
 180  */
 181 void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
 182 {
 183         struct pcim_iomap_devres *dr, *new_dr;
 184
 185         dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 186         if (dr)
 187                 return dr->table;
 188
 189         new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 190         if (!new_dr)
 191                 return NULL;
 192         dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 193         return dr->table;
 194 }
 195 EXPORT_SYMBOL(pcim_iomap_table);
 196
 197 /**
 198  * pcim_iomap - Managed pcim_iomap()
 199  * @pdev: PCI device to iomap for
 200  * @bar: BAR to iomap
 201  * @maxlen: Maximum length of iomap
 202  *
 203  * Managed pci_iomap().  Map is automatically unmapped on driver
 204  * detach.
 205  */
 206 void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 207 {
 208         void __iomem **tbl;
 209
 210         BUG_ON(bar >= PCIM_IOMAP_MAX);
 211
 212         tbl = (void __iomem **)pcim_iomap_table(pdev);
 213         if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 214                 return NULL;
 215
 216         tbl[bar] = pci_iomap(pdev, bar, maxlen);
 217         return tbl[bar];
 218 }
 219 EXPORT_SYMBOL(pcim_iomap);
 220
 221 /**
 222  * pcim_iounmap - Managed pci_iounmap()
 223  * @pdev: PCI device to iounmap for
 224  * @addr: Address to unmap
 225  *
 226  * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 227  */
 228 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 229 {
 230         void __iomem **tbl;
 231         int i;
 232
 233         pci_iounmap(pdev, addr);
 234
 235         tbl = (void __iomem **)pcim_iomap_table(pdev);
 236         BUG_ON(!tbl);
 237
 238         for (i = 0; i < PCIM_IOMAP_MAX; i++)
 239                 if (tbl[i] == addr) {
 240                         tbl[i] = NULL;
 241                         return;
 242                 }
 243         WARN_ON(1);
 244 }
 245 EXPORT_SYMBOL(pcim_iounmap);
 246
 247 /**
 248  * pcim_iomap_regions - Request and iomap PCI BARs
 249  * @pdev: PCI device to map IO resources for
 250  * @mask: Mask of BARs to request and iomap
 251  * @name: Name used when requesting regions
 252  *
 253  * Request and iomap regions specified by @mask.
 254  */
 255 int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
 256 {
 257         void __iomem * const *iomap;
 258         int i, rc;
 259
 260         iomap = pcim_iomap_table(pdev);
 261         if (!iomap)
 262                 return -ENOMEM;
 263
 264         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 265                 unsigned long len;
 266
 267                 if (!(mask & (1 << i)))
 268                         continue;
 269
 270                 rc = -EINVAL;
 271                 len = pci_resource_len(pdev, i);
 272                 if (!len)
 273                         goto err_inval;
 274
 275                 rc = pci_request_region(pdev, i, name);
 276                 if (rc)
 277                         goto err_region;
 278
 279                 rc = -ENOMEM;
 280                 if (!pcim_iomap(pdev, i, 0))
 281                         goto err_iomap;
 282         }
 283
 284         return 0;
 285
 286  err_iomap:
 287         pcim_iounmap(pdev, iomap[i]);
 288  err_region:
 289         pci_release_region(pdev, i);
 290  err_inval:
 291         while (--i >= 0) {
 292                 pcim_iounmap(pdev, iomap[i]);
 293                 pci_release_region(pdev, i);
 294         }
 295
 296         return rc;
 297 }
 298 EXPORT_SYMBOL(pcim_iomap_regions);
 299 #endif
 300 #endif