drivers/pci/endpoint/pci-epc-core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PCI Endpoint *Controller* (EPC) library
   4  *
   5  * Copyright (C) 2017 Texas Instruments
   6  * Author: Kishon Vijay Abraham I <kishon@ti.com>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/slab.h>
  11 #include <linux/module.h>
  12 #include <linux/of_device.h>
  13
  14 #include <linux/pci-epc.h>
  15 #include <linux/pci-epf.h>
  16 #include <linux/pci-ep-cfs.h>
  17
  18 static struct class *pci_epc_class;
  19
  20 static void devm_pci_epc_release(struct device *dev, void *res)
  21 {
  22         struct pci_epc *epc = *(struct pci_epc **)res;
  23
  24         pci_epc_destroy(epc);
  25 }
  26
  27 static int devm_pci_epc_match(struct device *dev, void *res, void *match_data)
  28 {
  29         struct pci_epc **epc = res;
  30
  31         return *epc == match_data;
  32 }
  33
  34 /**
  35  * pci_epc_put() - release the PCI endpoint controller
  36  * @epc: epc returned by pci_epc_get()
  37  *
  38  * release the refcount the caller obtained by invoking pci_epc_get()
  39  */
  40 void pci_epc_put(struct pci_epc *epc)
  41 {
  42         if (!epc || IS_ERR(epc))
  43                 return;
  44
  45         module_put(epc->ops->owner);
  46         put_device(&epc->dev);
  47 }
  48 EXPORT_SYMBOL_GPL(pci_epc_put);
  49
  50 /**
  51  * pci_epc_get() - get the PCI endpoint controller
  52  * @epc_name: device name of the endpoint controller
  53  *
  54  * Invoke to get struct pci_epc * corresponding to the device name of the
  55  * endpoint controller
  56  */
  57 struct pci_epc *pci_epc_get(const char *epc_name)
  58 {
  59         int ret = -EINVAL;
  60         struct pci_epc *epc;
  61         struct device *dev;
  62         struct class_dev_iter iter;
  63
  64         class_dev_iter_init(&iter, pci_epc_class, NULL, NULL);
  65         while ((dev = class_dev_iter_next(&iter))) {
  66                 if (strcmp(epc_name, dev_name(dev)))
  67                         continue;
  68
  69                 epc = to_pci_epc(dev);
  70                 if (!try_module_get(epc->ops->owner)) {
  71                         ret = -EINVAL;
  72                         goto err;
  73                 }
  74
  75                 class_dev_iter_exit(&iter);
  76                 get_device(&epc->dev);
  77                 return epc;
  78         }
  79
  80 err:
  81         class_dev_iter_exit(&iter);
  82         return ERR_PTR(ret);
  83 }
  84 EXPORT_SYMBOL_GPL(pci_epc_get);
  85
  86 /**
  87  * pci_epc_get_first_free_bar() - helper to get first unreserved BAR
  88  * @epc_features: pci_epc_features structure that holds the reserved bar bitmap
  89  *
  90  * Invoke to get the first unreserved BAR that can be used for endpoint
  91  * function. For any incorrect value in reserved_bar return '0'.
  92  */
  93 unsigned int pci_epc_get_first_free_bar(const struct pci_epc_features
  94                                         *epc_features)
  95 {
  96         int free_bar;
  97
  98         if (!epc_features)
  99                 return 0;
 100
 101         free_bar = ffz(epc_features->reserved_bar);
 102         if (free_bar > 5)
 103                 return 0;
 104
 105         return free_bar;
 106 }
 107 EXPORT_SYMBOL_GPL(pci_epc_get_first_free_bar);
 108
 109 /**
 110  * pci_epc_get_features() - get the features supported by EPC
 111  * @epc: the features supported by *this* EPC device will be returned
 112  * @func_no: the features supported by the EPC device specific to the
 113  *           endpoint function with func_no will be returned
 114  *
 115  * Invoke to get the features provided by the EPC which may be
 116  * specific to an endpoint function. Returns pci_epc_features on success
 117  * and NULL for any failures.
 118  */
 119 const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
 120                                                     u8 func_no)
 121 {
 122         const struct pci_epc_features *epc_features;
 123
 124         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 125                 return NULL;
 126
 127         if (!epc->ops->get_features)
 128                 return NULL;
 129
 130         mutex_lock(&epc->lock);
 131         epc_features = epc->ops->get_features(epc, func_no);
 132         mutex_unlock(&epc->lock);
 133
 134         return epc_features;
 135 }
 136 EXPORT_SYMBOL_GPL(pci_epc_get_features);
 137
 138 /**
 139  * pci_epc_stop() - stop the PCI link
 140  * @epc: the link of the EPC device that has to be stopped
 141  *
 142  * Invoke to stop the PCI link
 143  */
 144 void pci_epc_stop(struct pci_epc *epc)
 145 {
 146         if (IS_ERR(epc) || !epc->ops->stop)
 147                 return;
 148
 149         mutex_lock(&epc->lock);
 150         epc->ops->stop(epc);
 151         mutex_unlock(&epc->lock);
 152 }
 153 EXPORT_SYMBOL_GPL(pci_epc_stop);
 154
 155 /**
 156  * pci_epc_start() - start the PCI link
 157  * @epc: the link of *this* EPC device has to be started
 158  *
 159  * Invoke to start the PCI link
 160  */
 161 int pci_epc_start(struct pci_epc *epc)
 162 {
 163         int ret;
 164
 165         if (IS_ERR(epc))
 166                 return -EINVAL;
 167
 168         if (!epc->ops->start)
 169                 return 0;
 170
 171         mutex_lock(&epc->lock);
 172         ret = epc->ops->start(epc);
 173         mutex_unlock(&epc->lock);
 174
 175         return ret;
 176 }
 177 EXPORT_SYMBOL_GPL(pci_epc_start);
 178
 179 /**
 180  * pci_epc_raise_irq() - interrupt the host system
 181  * @epc: the EPC device which has to interrupt the host
 182  * @func_no: the endpoint function number in the EPC device
 183  * @type: specify the type of interrupt; legacy, MSI or MSI-X
 184  * @interrupt_num: the MSI or MSI-X interrupt number
 185  *
 186  * Invoke to raise an legacy, MSI or MSI-X interrupt
 187  */
 188 int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no,
 189                       enum pci_epc_irq_type type, u16 interrupt_num)
 190 {
 191         int ret;
 192
 193         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 194                 return -EINVAL;
 195
 196         if (!epc->ops->raise_irq)
 197                 return 0;
 198
 199         mutex_lock(&epc->lock);
 200         ret = epc->ops->raise_irq(epc, func_no, type, interrupt_num);
 201         mutex_unlock(&epc->lock);
 202
 203         return ret;
 204 }
 205 EXPORT_SYMBOL_GPL(pci_epc_raise_irq);
 206
 207 /**
 208  * pci_epc_get_msi() - get the number of MSI interrupt numbers allocated
 209  * @epc: the EPC device to which MSI interrupts was requested
 210  * @func_no: the endpoint function number in the EPC device
 211  *
 212  * Invoke to get the number of MSI interrupts allocated by the RC
 213  */
 214 int pci_epc_get_msi(struct pci_epc *epc, u8 func_no)
 215 {
 216         int interrupt;
 217
 218         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 219                 return 0;
 220
 221         if (!epc->ops->get_msi)
 222                 return 0;
 223
 224         mutex_lock(&epc->lock);
 225         interrupt = epc->ops->get_msi(epc, func_no);
 226         mutex_unlock(&epc->lock);
 227
 228         if (interrupt < 0)
 229                 return 0;
 230
 231         interrupt = 1 << interrupt;
 232
 233         return interrupt;
 234 }
 235 EXPORT_SYMBOL_GPL(pci_epc_get_msi);
 236
 237 /**
 238  * pci_epc_set_msi() - set the number of MSI interrupt numbers required
 239  * @epc: the EPC device on which MSI has to be configured
 240  * @func_no: the endpoint function number in the EPC device
 241  * @interrupts: number of MSI interrupts required by the EPF
 242  *
 243  * Invoke to set the required number of MSI interrupts.
 244  */
 245 int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 interrupts)
 246 {
 247         int ret;
 248         u8 encode_int;
 249
 250         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 251             interrupts > 32)
 252                 return -EINVAL;
 253
 254         if (!epc->ops->set_msi)
 255                 return 0;
 256
 257         encode_int = order_base_2(interrupts);
 258
 259         mutex_lock(&epc->lock);
 260         ret = epc->ops->set_msi(epc, func_no, encode_int);
 261         mutex_unlock(&epc->lock);
 262
 263         return ret;
 264 }
 265 EXPORT_SYMBOL_GPL(pci_epc_set_msi);
 266
 267 /**
 268  * pci_epc_get_msix() - get the number of MSI-X interrupt numbers allocated
 269  * @epc: the EPC device to which MSI-X interrupts was requested
 270  * @func_no: the endpoint function number in the EPC device
 271  *
 272  * Invoke to get the number of MSI-X interrupts allocated by the RC
 273  */
 274 int pci_epc_get_msix(struct pci_epc *epc, u8 func_no)
 275 {
 276         int interrupt;
 277
 278         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 279                 return 0;
 280
 281         if (!epc->ops->get_msix)
 282                 return 0;
 283
 284         mutex_lock(&epc->lock);
 285         interrupt = epc->ops->get_msix(epc, func_no);
 286         mutex_unlock(&epc->lock);
 287
 288         if (interrupt < 0)
 289                 return 0;
 290
 291         return interrupt + 1;
 292 }
 293 EXPORT_SYMBOL_GPL(pci_epc_get_msix);
 294
 295 /**
 296  * pci_epc_set_msix() - set the number of MSI-X interrupt numbers required
 297  * @epc: the EPC device on which MSI-X has to be configured
 298  * @func_no: the endpoint function number in the EPC device
 299  * @interrupts: number of MSI-X interrupts required by the EPF
 300  * @bir: BAR where the MSI-X table resides
 301  * @offset: Offset pointing to the start of MSI-X table
 302  *
 303  * Invoke to set the required number of MSI-X interrupts.
 304  */
 305 int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u16 interrupts,
 306                      enum pci_barno bir, u32 offset)
 307 {
 308         int ret;
 309
 310         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 311             interrupts < 1 || interrupts > 2048)
 312                 return -EINVAL;
 313
 314         if (!epc->ops->set_msix)
 315                 return 0;
 316
 317         mutex_lock(&epc->lock);
 318         ret = epc->ops->set_msix(epc, func_no, interrupts - 1, bir, offset);
 319         mutex_unlock(&epc->lock);
 320
 321         return ret;
 322 }
 323 EXPORT_SYMBOL_GPL(pci_epc_set_msix);
 324
 325 /**
 326  * pci_epc_unmap_addr() - unmap CPU address from PCI address
 327  * @epc: the EPC device on which address is allocated
 328  * @func_no: the endpoint function number in the EPC device
 329  * @phys_addr: physical address of the local system
 330  *
 331  * Invoke to unmap the CPU address from PCI address.
 332  */
 333 void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no,
 334                         phys_addr_t phys_addr)
 335 {
 336         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 337                 return;
 338
 339         if (!epc->ops->unmap_addr)
 340                 return;
 341
 342         mutex_lock(&epc->lock);
 343         epc->ops->unmap_addr(epc, func_no, phys_addr);
 344         mutex_unlock(&epc->lock);
 345 }
 346 EXPORT_SYMBOL_GPL(pci_epc_unmap_addr);
 347
 348 /**
 349  * pci_epc_map_addr() - map CPU address to PCI address
 350  * @epc: the EPC device on which address is allocated
 351  * @func_no: the endpoint function number in the EPC device
 352  * @phys_addr: physical address of the local system
 353  * @pci_addr: PCI address to which the physical address should be mapped
 354  * @size: the size of the allocation
 355  *
 356  * Invoke to map CPU address with PCI address.
 357  */
 358 int pci_epc_map_addr(struct pci_epc *epc, u8 func_no,
 359                      phys_addr_t phys_addr, u64 pci_addr, size_t size)
 360 {
 361         int ret;
 362
 363         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 364                 return -EINVAL;
 365
 366         if (!epc->ops->map_addr)
 367                 return 0;
 368
 369         mutex_lock(&epc->lock);
 370         ret = epc->ops->map_addr(epc, func_no, phys_addr, pci_addr, size);
 371         mutex_unlock(&epc->lock);
 372
 373         return ret;
 374 }
 375 EXPORT_SYMBOL_GPL(pci_epc_map_addr);
 376
 377 /**
 378  * pci_epc_clear_bar() - reset the BAR
 379  * @epc: the EPC device for which the BAR has to be cleared
 380  * @func_no: the endpoint function number in the EPC device
 381  * @epf_bar: the struct epf_bar that contains the BAR information
 382  *
 383  * Invoke to reset the BAR of the endpoint device.
 384  */
 385 void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no,
 386                        struct pci_epf_bar *epf_bar)
 387 {
 388         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 389             (epf_bar->barno == BAR_5 &&
 390              epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64))
 391                 return;
 392
 393         if (!epc->ops->clear_bar)
 394                 return;
 395
 396         mutex_lock(&epc->lock);
 397         epc->ops->clear_bar(epc, func_no, epf_bar);
 398         mutex_unlock(&epc->lock);
 399 }
 400 EXPORT_SYMBOL_GPL(pci_epc_clear_bar);
 401
 402 /**
 403  * pci_epc_set_bar() - configure BAR in order for host to assign PCI addr space
 404  * @epc: the EPC device on which BAR has to be configured
 405  * @func_no: the endpoint function number in the EPC device
 406  * @epf_bar: the struct epf_bar that contains the BAR information
 407  *
 408  * Invoke to configure the BAR of the endpoint device.
 409  */
 410 int pci_epc_set_bar(struct pci_epc *epc, u8 func_no,
 411                     struct pci_epf_bar *epf_bar)
 412 {
 413         int ret;
 414         int flags = epf_bar->flags;
 415
 416         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions ||
 417             (epf_bar->barno == BAR_5 &&
 418              flags & PCI_BASE_ADDRESS_MEM_TYPE_64) ||
 419             (flags & PCI_BASE_ADDRESS_SPACE_IO &&
 420              flags & PCI_BASE_ADDRESS_IO_MASK) ||
 421             (upper_32_bits(epf_bar->size) &&
 422              !(flags & PCI_BASE_ADDRESS_MEM_TYPE_64)))
 423                 return -EINVAL;
 424
 425         if (!epc->ops->set_bar)
 426                 return 0;
 427
 428         mutex_lock(&epc->lock);
 429         ret = epc->ops->set_bar(epc, func_no, epf_bar);
 430         mutex_unlock(&epc->lock);
 431
 432         return ret;
 433 }
 434 EXPORT_SYMBOL_GPL(pci_epc_set_bar);
 435
 436 /**
 437  * pci_epc_write_header() - write standard configuration header
 438  * @epc: the EPC device to which the configuration header should be written
 439  * @func_no: the endpoint function number in the EPC device
 440  * @header: standard configuration header fields
 441  *
 442  * Invoke to write the configuration header to the endpoint controller. Every
 443  * endpoint controller will have a dedicated location to which the standard
 444  * configuration header would be written. The callback function should write
 445  * the header fields to this dedicated location.
 446  */
 447 int pci_epc_write_header(struct pci_epc *epc, u8 func_no,
 448                          struct pci_epf_header *header)
 449 {
 450         int ret;
 451
 452         if (IS_ERR_OR_NULL(epc) || func_no >= epc->max_functions)
 453                 return -EINVAL;
 454
 455         if (!epc->ops->write_header)
 456                 return 0;
 457
 458         mutex_lock(&epc->lock);
 459         ret = epc->ops->write_header(epc, func_no, header);
 460         mutex_unlock(&epc->lock);
 461
 462         return ret;
 463 }
 464 EXPORT_SYMBOL_GPL(pci_epc_write_header);
 465
 466 /**
 467  * pci_epc_add_epf() - bind PCI endpoint function to an endpoint controller
 468  * @epc: the EPC device to which the endpoint function should be added
 469  * @epf: the endpoint function to be added
 470  *
 471  * A PCI endpoint device can have one or more functions. In the case of PCIe,
 472  * the specification allows up to 8 PCIe endpoint functions. Invoke
 473  * pci_epc_add_epf() to add a PCI endpoint function to an endpoint controller.
 474  */
 475 int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
 476 {
 477         u32 func_no;
 478         int ret = 0;
 479
 480         if (epf->epc)
 481                 return -EBUSY;
 482
 483         if (IS_ERR(epc))
 484                 return -EINVAL;
 485
 486         mutex_lock(&epc->lock);
 487         func_no = find_first_zero_bit(&epc->function_num_map,
 488                                       BITS_PER_LONG);
 489         if (func_no >= BITS_PER_LONG) {
 490                 ret = -EINVAL;
 491                 goto ret;
 492         }
 493
 494         if (func_no > epc->max_functions - 1) {
 495                 dev_err(&epc->dev, "Exceeding max supported Function Number\n");
 496                 ret = -EINVAL;
 497                 goto ret;
 498         }
 499
 500         set_bit(func_no, &epc->function_num_map);
 501         epf->func_no = func_no;
 502         epf->epc = epc;
 503
 504         list_add_tail(&epf->list, &epc->pci_epf);
 505
 506 ret:
 507         mutex_unlock(&epc->lock);
 508
 509         return ret;
 510 }
 511 EXPORT_SYMBOL_GPL(pci_epc_add_epf);
 512
 513 /**
 514  * pci_epc_remove_epf() - remove PCI endpoint function from endpoint controller
 515  * @epc: the EPC device from which the endpoint function should be removed
 516  * @epf: the endpoint function to be removed
 517  *
 518  * Invoke to remove PCI endpoint function from the endpoint controller.
 519  */
 520 void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf)
 521 {
 522         if (!epc || IS_ERR(epc) || !epf)
 523                 return;
 524
 525         mutex_lock(&epc->lock);
 526         clear_bit(epf->func_no, &epc->function_num_map);
 527         list_del(&epf->list);
 528         epf->epc = NULL;
 529         mutex_unlock(&epc->lock);
 530 }
 531 EXPORT_SYMBOL_GPL(pci_epc_remove_epf);
 532
 533 /**
 534  * pci_epc_linkup() - Notify the EPF device that EPC device has established a
 535  *                    connection with the Root Complex.
 536  * @epc: the EPC device which has established link with the host
 537  *
 538  * Invoke to Notify the EPF device that the EPC device has established a
 539  * connection with the Root Complex.
 540  */
 541 void pci_epc_linkup(struct pci_epc *epc)
 542 {
 543         if (!epc || IS_ERR(epc))
 544                 return;
 545
 546         atomic_notifier_call_chain(&epc->notifier, LINK_UP, NULL);
 547 }
 548 EXPORT_SYMBOL_GPL(pci_epc_linkup);
 549
 550 /**
 551  * pci_epc_init_notify() - Notify the EPF device that EPC device's core
 552  *                         initialization is completed.
 553  * @epc: the EPC device whose core initialization is completeds
 554  *
 555  * Invoke to Notify the EPF device that the EPC device's initialization
 556  * is completed.
 557  */
 558 void pci_epc_init_notify(struct pci_epc *epc)
 559 {
 560         if (!epc || IS_ERR(epc))
 561                 return;
 562
 563         atomic_notifier_call_chain(&epc->notifier, CORE_INIT, NULL);
 564 }
 565 EXPORT_SYMBOL_GPL(pci_epc_init_notify);
 566
 567 /**
 568  * pci_epc_destroy() - destroy the EPC device
 569  * @epc: the EPC device that has to be destroyed
 570  *
 571  * Invoke to destroy the PCI EPC device
 572  */
 573 void pci_epc_destroy(struct pci_epc *epc)
 574 {
 575         pci_ep_cfs_remove_epc_group(epc->group);
 576         device_unregister(&epc->dev);
 577         kfree(epc);
 578 }
 579 EXPORT_SYMBOL_GPL(pci_epc_destroy);
 580
 581 /**
 582  * devm_pci_epc_destroy() - destroy the EPC device
 583  * @dev: device that wants to destroy the EPC
 584  * @epc: the EPC device that has to be destroyed
 585  *
 586  * Invoke to destroy the devres associated with this
 587  * pci_epc and destroy the EPC device.
 588  */
 589 void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc)
 590 {
 591         int r;
 592
 593         r = devres_destroy(dev, devm_pci_epc_release, devm_pci_epc_match,
 594                            epc);
 595         dev_WARN_ONCE(dev, r, "couldn't find PCI EPC resource\n");
 596 }
 597 EXPORT_SYMBOL_GPL(devm_pci_epc_destroy);
 598
 599 /**
 600  * __pci_epc_create() - create a new endpoint controller (EPC) device
 601  * @dev: device that is creating the new EPC
 602  * @ops: function pointers for performing EPC operations
 603  * @owner: the owner of the module that creates the EPC device
 604  *
 605  * Invoke to create a new EPC device and add it to pci_epc class.
 606  */
 607 struct pci_epc *
 608 __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 609                  struct module *owner)
 610 {
 611         int ret;
 612         struct pci_epc *epc;
 613
 614         if (WARN_ON(!dev)) {
 615                 ret = -EINVAL;
 616                 goto err_ret;
 617         }
 618
 619         epc = kzalloc(sizeof(*epc), GFP_KERNEL);
 620         if (!epc) {
 621                 ret = -ENOMEM;
 622                 goto err_ret;
 623         }
 624
 625         mutex_init(&epc->lock);
 626         INIT_LIST_HEAD(&epc->pci_epf);
 627         ATOMIC_INIT_NOTIFIER_HEAD(&epc->notifier);
 628
 629         device_initialize(&epc->dev);
 630         epc->dev.class = pci_epc_class;
 631         epc->dev.parent = dev;
 632         epc->ops = ops;
 633
 634         ret = dev_set_name(&epc->dev, "%s", dev_name(dev));
 635         if (ret)
 636                 goto put_dev;
 637
 638         ret = device_add(&epc->dev);
 639         if (ret)
 640                 goto put_dev;
 641
 642         epc->group = pci_ep_cfs_add_epc_group(dev_name(dev));
 643
 644         return epc;
 645
 646 put_dev:
 647         put_device(&epc->dev);
 648         kfree(epc);
 649
 650 err_ret:
 651         return ERR_PTR(ret);
 652 }
 653 EXPORT_SYMBOL_GPL(__pci_epc_create);
 654
 655 /**
 656  * __devm_pci_epc_create() - create a new endpoint controller (EPC) device
 657  * @dev: device that is creating the new EPC
 658  * @ops: function pointers for performing EPC operations
 659  * @owner: the owner of the module that creates the EPC device
 660  *
 661  * Invoke to create a new EPC device and add it to pci_epc class.
 662  * While at that, it also associates the device with the pci_epc using devres.
 663  * On driver detach, release function is invoked on the devres data,
 664  * then, devres data is freed.
 665  */
 666 struct pci_epc *
 667 __devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
 668                       struct module *owner)
 669 {
 670         struct pci_epc **ptr, *epc;
 671
 672         ptr = devres_alloc(devm_pci_epc_release, sizeof(*ptr), GFP_KERNEL);
 673         if (!ptr)
 674                 return ERR_PTR(-ENOMEM);
 675
 676         epc = __pci_epc_create(dev, ops, owner);
 677         if (!IS_ERR(epc)) {
 678                 *ptr = epc;
 679                 devres_add(dev, ptr);
 680         } else {
 681                 devres_free(ptr);
 682         }
 683
 684         return epc;
 685 }
 686 EXPORT_SYMBOL_GPL(__devm_pci_epc_create);
 687
 688 static int __init pci_epc_init(void)
 689 {
 690         pci_epc_class = class_create(THIS_MODULE, "pci_epc");
 691         if (IS_ERR(pci_epc_class)) {
 692                 pr_err("failed to create pci epc class --> %ld\n",
 693                        PTR_ERR(pci_epc_class));
 694                 return PTR_ERR(pci_epc_class);
 695         }
 696
 697         return 0;
 698 }
 699 module_init(pci_epc_init);
 700
 701 static void __exit pci_epc_exit(void)
 702 {
 703         class_destroy(pci_epc_class);
 704 }
 705 module_exit(pci_epc_exit);
 706
 707 MODULE_DESCRIPTION("PCI EPC Library");
 708 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
 709 MODULE_LICENSE("GPL v2");