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 iounmap(addr); 83 WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match, 84 (void *)addr)); 85 } 86 EXPORT_SYMBOL(devm_iounmap); 87 88 #ifdef CONFIG_HAS_IOPORT 89 /* 90 * Generic iomap devres 91 */ 92 static void devm_ioport_map_release(struct device *dev, void *res) 93 { 94 ioport_unmap(*(void __iomem **)res); 95 } 96 97 static int devm_ioport_map_match(struct device *dev, void *res, 98 void *match_data) 99 { 100 return *(void **)res == match_data; 101 } 102 103 /** 104 * devm_ioport_map - Managed ioport_map() 105 * @dev: Generic device to map ioport for 106 * @port: Port to map 107 * @nr: Number of ports to map 108 * 109 * Managed ioport_map(). Map is automatically unmapped on driver 110 * detach. 111 */ 112 void __iomem * devm_ioport_map(struct device *dev, unsigned long port, 113 unsigned int nr) 114 { 115 void __iomem **ptr, *addr; 116 117 ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL); 118 if (!ptr) 119 return NULL; 120 121 addr = ioport_map(port, nr); 122 if (addr) { 123 *ptr = addr; 124 devres_add(dev, ptr); 125 } else 126 devres_free(ptr); 127 128 return addr; 129 } 130 EXPORT_SYMBOL(devm_ioport_map); 131 132 /** 133 * devm_ioport_unmap - Managed ioport_unmap() 134 * @dev: Generic device to unmap for 135 * @addr: Address to unmap 136 * 137 * Managed ioport_unmap(). @addr must have been mapped using 138 * devm_ioport_map(). 139 */ 140 void devm_ioport_unmap(struct device *dev, void __iomem *addr) 141 { 142 ioport_unmap(addr); 143 WARN_ON(devres_destroy(dev, devm_ioport_map_release, 144 devm_ioport_map_match, (void *)addr)); 145 } 146 EXPORT_SYMBOL(devm_ioport_unmap); 147 148 #ifdef CONFIG_PCI 149 /* 150 * PCI iomap devres 151 */ 152 #define PCIM_IOMAP_MAX PCI_ROM_RESOURCE 153 154 struct pcim_iomap_devres { 155 void __iomem *table[PCIM_IOMAP_MAX]; 156 }; 157 158 static void pcim_iomap_release(struct device *gendev, void *res) 159 { 160 struct pci_dev *dev = container_of(gendev, struct pci_dev, dev); 161 struct pcim_iomap_devres *this = res; 162 int i; 163 164 for (i = 0; i < PCIM_IOMAP_MAX; i++) 165 if (this->table[i]) 166 pci_iounmap(dev, this->table[i]); 167 } 168 169 /** 170 * pcim_iomap_table - access iomap allocation table 171 * @pdev: PCI device to access iomap table for 172 * 173 * Access iomap allocation table for @dev. If iomap table doesn't 174 * exist and @pdev is managed, it will be allocated. All iomaps 175 * recorded in the iomap table are automatically unmapped on driver 176 * detach. 177 * 178 * This function might sleep when the table is first allocated but can 179 * be safely called without context and guaranteed to succed once 180 * allocated. 181 */ 182 void __iomem * const * pcim_iomap_table(struct pci_dev *pdev) 183 { 184 struct pcim_iomap_devres *dr, *new_dr; 185 186 dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL); 187 if (dr) 188 return dr->table; 189 190 new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL); 191 if (!new_dr) 192 return NULL; 193 dr = devres_get(&pdev->dev, new_dr, NULL, NULL); 194 return dr->table; 195 } 196 EXPORT_SYMBOL(pcim_iomap_table); 197 198 /** 199 * pcim_iomap - Managed pcim_iomap() 200 * @pdev: PCI device to iomap for 201 * @bar: BAR to iomap 202 * @maxlen: Maximum length of iomap 203 * 204 * Managed pci_iomap(). Map is automatically unmapped on driver 205 * detach. 206 */ 207 void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen) 208 { 209 void __iomem **tbl; 210 211 BUG_ON(bar >= PCIM_IOMAP_MAX); 212 213 tbl = (void __iomem **)pcim_iomap_table(pdev); 214 if (!tbl || tbl[bar]) /* duplicate mappings not allowed */ 215 return NULL; 216 217 tbl[bar] = pci_iomap(pdev, bar, maxlen); 218 return tbl[bar]; 219 } 220 EXPORT_SYMBOL(pcim_iomap); 221 222 /** 223 * pcim_iounmap - Managed pci_iounmap() 224 * @pdev: PCI device to iounmap for 225 * @addr: Address to unmap 226 * 227 * Managed pci_iounmap(). @addr must have been mapped using pcim_iomap(). 228 */ 229 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr) 230 { 231 void __iomem **tbl; 232 int i; 233 234 pci_iounmap(pdev, addr); 235 236 tbl = (void __iomem **)pcim_iomap_table(pdev); 237 BUG_ON(!tbl); 238 239 for (i = 0; i < PCIM_IOMAP_MAX; i++) 240 if (tbl[i] == addr) { 241 tbl[i] = NULL; 242 return; 243 } 244 WARN_ON(1); 245 } 246 EXPORT_SYMBOL(pcim_iounmap); 247 248 /** 249 * pcim_iomap_regions - Request and iomap PCI BARs 250 * @pdev: PCI device to map IO resources for 251 * @mask: Mask of BARs to request and iomap 252 * @name: Name used when requesting regions 253 * 254 * Request and iomap regions specified by @mask. 255 */ 256 int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name) 257 { 258 void __iomem * const *iomap; 259 int i, rc; 260 261 iomap = pcim_iomap_table(pdev); 262 if (!iomap) 263 return -ENOMEM; 264 265 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 266 unsigned long len; 267 268 if (!(mask & (1 << i))) 269 continue; 270 271 rc = -EINVAL; 272 len = pci_resource_len(pdev, i); 273 if (!len) 274 goto err_inval; 275 276 rc = pci_request_region(pdev, i, name); 277 if (rc) 278 goto err_inval; 279 280 rc = -ENOMEM; 281 if (!pcim_iomap(pdev, i, 0)) 282 goto err_region; 283 } 284 285 return 0; 286 287 err_region: 288 pci_release_region(pdev, i); 289 err_inval: 290 while (--i >= 0) { 291 if (!(mask & (1 << i))) 292 continue; 293 pcim_iounmap(pdev, iomap[i]); 294 pci_release_region(pdev, i); 295 } 296 297 return rc; 298 } 299 EXPORT_SYMBOL(pcim_iomap_regions); 300 301 /** 302 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones 303 * @pdev: PCI device to map IO resources for 304 * @mask: Mask of BARs to iomap 305 * @name: Name used when requesting regions 306 * 307 * Request all PCI BARs and iomap regions specified by @mask. 308 */ 309 int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask, 310 const char *name) 311 { 312 int request_mask = ((1 << 6) - 1) & ~mask; 313 int rc; 314 315 rc = pci_request_selected_regions(pdev, request_mask, name); 316 if (rc) 317 return rc; 318 319 rc = pcim_iomap_regions(pdev, mask, name); 320 if (rc) 321 pci_release_selected_regions(pdev, request_mask); 322 return rc; 323 } 324 EXPORT_SYMBOL(pcim_iomap_regions_request_all); 325 326 /** 327 * pcim_iounmap_regions - Unmap and release PCI BARs 328 * @pdev: PCI device to map IO resources for 329 * @mask: Mask of BARs to unmap and release 330 * 331 * Unmap and release regions specified by @mask. 332 */ 333 void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask) 334 { 335 void __iomem * const *iomap; 336 int i; 337 338 iomap = pcim_iomap_table(pdev); 339 if (!iomap) 340 return; 341 342 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 343 if (!(mask & (1 << i))) 344 continue; 345 346 pcim_iounmap(pdev, iomap[i]); 347 pci_release_region(pdev, i); 348 } 349 } 350 EXPORT_SYMBOL(pcim_iounmap_regions); 351 #endif 352 #endif 353