1 #include <linux/pci.h> 2 #include <linux/io.h> 3 #include <linux/module.h> 4 5 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, resource_size_t 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, resource_size_t 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_inval; 278 279 rc = -ENOMEM; 280 if (!pcim_iomap(pdev, i, 0)) 281 goto err_region; 282 } 283 284 return 0; 285 286 err_region: 287 pci_release_region(pdev, i); 288 err_inval: 289 while (--i >= 0) { 290 if (!(mask & (1 << i))) 291 continue; 292 pcim_iounmap(pdev, iomap[i]); 293 pci_release_region(pdev, i); 294 } 295 296 return rc; 297 } 298 EXPORT_SYMBOL(pcim_iomap_regions); 299 300 /** 301 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones 302 * @pdev: PCI device to map IO resources for 303 * @mask: Mask of BARs to iomap 304 * @name: Name used when requesting regions 305 * 306 * Request all PCI BARs and iomap regions specified by @mask. 307 */ 308 int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask, 309 const char *name) 310 { 311 int request_mask = ((1 << 6) - 1) & ~mask; 312 int rc; 313 314 rc = pci_request_selected_regions(pdev, request_mask, name); 315 if (rc) 316 return rc; 317 318 rc = pcim_iomap_regions(pdev, mask, name); 319 if (rc) 320 pci_release_selected_regions(pdev, request_mask); 321 return rc; 322 } 323 EXPORT_SYMBOL(pcim_iomap_regions_request_all); 324 325 /** 326 * pcim_iounmap_regions - Unmap and release PCI BARs 327 * @pdev: PCI device to map IO resources for 328 * @mask: Mask of BARs to unmap and release 329 * 330 * Unamp and release regions specified by @mask. 331 */ 332 void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask) 333 { 334 void __iomem * const *iomap; 335 int i; 336 337 iomap = pcim_iomap_table(pdev); 338 if (!iomap) 339 return; 340 341 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 342 if (!(mask & (1 << i))) 343 continue; 344 345 pcim_iounmap(pdev, iomap[i]); 346 pci_release_region(pdev, i); 347 } 348 } 349 EXPORT_SYMBOL(pcim_iounmap_regions); 350 #endif 351 #endif 352