arch/powerpc/kernel/ibmebus.c

   1 /*
   2  * IBM PowerPC IBM eBus Infrastructure Support.
   3  *
   4  * Copyright (c) 2005 IBM Corporation
   5  *  Joachim Fenkes <fenkes@de.ibm.com>
   6  *  Heiko J Schick <schickhj@de.ibm.com>
   7  *
   8  * All rights reserved.
   9  *
  10  * This source code is distributed under a dual license of GPL v2.0 and OpenIB
  11  * BSD.
  12  *
  13  * OpenIB BSD License
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions are met:
  17  *
  18  * Redistributions of source code must retain the above copyright notice, this
  19  * list of conditions and the following disclaimer.
  20  *
  21  * Redistributions in binary form must reproduce the above copyright notice,
  22  * this list of conditions and the following disclaimer in the documentation
  23  * and/or other materials
  24  * provided with the distribution.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  27  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  30  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  33  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  34  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36  * POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #include <linux/init.h>
  40 #include <linux/export.h>
  41 #include <linux/console.h>
  42 #include <linux/kobject.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/of.h>
  46 #include <linux/slab.h>
  47 #include <linux/stat.h>
  48 #include <linux/of_platform.h>
  49 #include <asm/ibmebus.h>
  50 #include <asm/abs_addr.h>
  51
  52 static struct device ibmebus_bus_device = { /* fake "parent" device */
  53         .init_name = "ibmebus",
  54 };
  55
  56 struct bus_type ibmebus_bus_type;
  57
  58 /* These devices will automatically be added to the bus during init */
  59 static struct of_device_id __initdata ibmebus_matches[] = {
  60         { .compatible = "IBM,lhca" },
  61         { .compatible = "IBM,lhea" },
  62         {},
  63 };
  64
  65 static void *ibmebus_alloc_coherent(struct device *dev,
  66                                     size_t size,
  67                                     dma_addr_t *dma_handle,
  68                                     gfp_t flag)
  69 {
  70         void *mem;
  71
  72         mem = kmalloc(size, flag);
  73         *dma_handle = (dma_addr_t)mem;
  74
  75         return mem;
  76 }
  77
  78 static void ibmebus_free_coherent(struct device *dev,
  79                                   size_t size, void *vaddr,
  80                                   dma_addr_t dma_handle)
  81 {
  82         kfree(vaddr);
  83 }
  84
  85 static dma_addr_t ibmebus_map_page(struct device *dev,
  86                                    struct page *page,
  87                                    unsigned long offset,
  88                                    size_t size,
  89                                    enum dma_data_direction direction,
  90                                    struct dma_attrs *attrs)
  91 {
  92         return (dma_addr_t)(page_address(page) + offset);
  93 }
  94
  95 static void ibmebus_unmap_page(struct device *dev,
  96                                dma_addr_t dma_addr,
  97                                size_t size,
  98                                enum dma_data_direction direction,
  99                                struct dma_attrs *attrs)
 100 {
 101         return;
 102 }
 103
 104 static int ibmebus_map_sg(struct device *dev,
 105                           struct scatterlist *sgl,
 106                           int nents, enum dma_data_direction direction,
 107                           struct dma_attrs *attrs)
 108 {
 109         struct scatterlist *sg;
 110         int i;
 111
 112         for_each_sg(sgl, sg, nents, i) {
 113                 sg->dma_address = (dma_addr_t) sg_virt(sg);
 114                 sg->dma_length = sg->length;
 115         }
 116
 117         return nents;
 118 }
 119
 120 static void ibmebus_unmap_sg(struct device *dev,
 121                              struct scatterlist *sg,
 122                              int nents, enum dma_data_direction direction,
 123                              struct dma_attrs *attrs)
 124 {
 125         return;
 126 }
 127
 128 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 129 {
 130         return 1;
 131 }
 132
 133 static struct dma_map_ops ibmebus_dma_ops = {
 134         .alloc_coherent = ibmebus_alloc_coherent,
 135         .free_coherent  = ibmebus_free_coherent,
 136         .map_sg         = ibmebus_map_sg,
 137         .unmap_sg       = ibmebus_unmap_sg,
 138         .dma_supported  = ibmebus_dma_supported,
 139         .map_page       = ibmebus_map_page,
 140         .unmap_page     = ibmebus_unmap_page,
 141 };
 142
 143 static int ibmebus_match_path(struct device *dev, void *data)
 144 {
 145         struct device_node *dn = to_platform_device(dev)->dev.of_node;
 146         return (dn->full_name &&
 147                 (strcasecmp((char *)data, dn->full_name) == 0));
 148 }
 149
 150 static int ibmebus_match_node(struct device *dev, void *data)
 151 {
 152         return to_platform_device(dev)->dev.of_node == data;
 153 }
 154
 155 static int ibmebus_create_device(struct device_node *dn)
 156 {
 157         struct platform_device *dev;
 158         int ret;
 159
 160         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
 161         if (!dev)
 162                 return -ENOMEM;
 163
 164         dev->dev.bus = &ibmebus_bus_type;
 165         dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
 166
 167         ret = of_device_add(dev);
 168         if (ret)
 169                 platform_device_put(dev);
 170         return ret;
 171 }
 172
 173 static int ibmebus_create_devices(const struct of_device_id *matches)
 174 {
 175         struct device_node *root, *child;
 176         int ret = 0;
 177
 178         root = of_find_node_by_path("/");
 179
 180         for_each_child_of_node(root, child) {
 181                 if (!of_match_node(matches, child))
 182                         continue;
 183
 184                 if (bus_find_device(&ibmebus_bus_type, NULL, child,
 185                                     ibmebus_match_node))
 186                         continue;
 187
 188                 ret = ibmebus_create_device(child);
 189                 if (ret) {
 190                         printk(KERN_ERR "%s: failed to create device (%i)",
 191                                __func__, ret);
 192                         of_node_put(child);
 193                         break;
 194                 }
 195         }
 196
 197         of_node_put(root);
 198         return ret;
 199 }
 200
 201 int ibmebus_register_driver(struct of_platform_driver *drv)
 202 {
 203         /* If the driver uses devices that ibmebus doesn't know, add them */
 204         ibmebus_create_devices(drv->driver.of_match_table);
 205
 206         drv->driver.bus = &ibmebus_bus_type;
 207         return driver_register(&drv->driver);
 208 }
 209 EXPORT_SYMBOL(ibmebus_register_driver);
 210
 211 void ibmebus_unregister_driver(struct of_platform_driver *drv)
 212 {
 213         driver_unregister(&drv->driver);
 214 }
 215 EXPORT_SYMBOL(ibmebus_unregister_driver);
 216
 217 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 218                         unsigned long irq_flags, const char *devname,
 219                         void *dev_id)
 220 {
 221         unsigned int irq = irq_create_mapping(NULL, ist);
 222
 223         if (irq == NO_IRQ)
 224                 return -EINVAL;
 225
 226         return request_irq(irq, handler, irq_flags, devname, dev_id);
 227 }
 228 EXPORT_SYMBOL(ibmebus_request_irq);
 229
 230 void ibmebus_free_irq(u32 ist, void *dev_id)
 231 {
 232         unsigned int irq = irq_find_mapping(NULL, ist);
 233
 234         free_irq(irq, dev_id);
 235         irq_dispose_mapping(irq);
 236 }
 237 EXPORT_SYMBOL(ibmebus_free_irq);
 238
 239 static char *ibmebus_chomp(const char *in, size_t count)
 240 {
 241         char *out = kmalloc(count + 1, GFP_KERNEL);
 242
 243         if (!out)
 244                 return NULL;
 245
 246         memcpy(out, in, count);
 247         out[count] = '\0';
 248         if (out[count - 1] == '\n')
 249                 out[count - 1] = '\0';
 250
 251         return out;
 252 }
 253
 254 static ssize_t ibmebus_store_probe(struct bus_type *bus,
 255                                    const char *buf, size_t count)
 256 {
 257         struct device_node *dn = NULL;
 258         char *path;
 259         ssize_t rc = 0;
 260
 261         path = ibmebus_chomp(buf, count);
 262         if (!path)
 263                 return -ENOMEM;
 264
 265         if (bus_find_device(&ibmebus_bus_type, NULL, path,
 266                             ibmebus_match_path)) {
 267                 printk(KERN_WARNING "%s: %s has already been probed\n",
 268                        __func__, path);
 269                 rc = -EEXIST;
 270                 goto out;
 271         }
 272
 273         if ((dn = of_find_node_by_path(path))) {
 274                 rc = ibmebus_create_device(dn);
 275                 of_node_put(dn);
 276         } else {
 277                 printk(KERN_WARNING "%s: no such device node: %s\n",
 278                        __func__, path);
 279                 rc = -ENODEV;
 280         }
 281
 282 out:
 283         kfree(path);
 284         if (rc)
 285                 return rc;
 286         return count;
 287 }
 288
 289 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 290                                     const char *buf, size_t count)
 291 {
 292         struct device *dev;
 293         char *path;
 294
 295         path = ibmebus_chomp(buf, count);
 296         if (!path)
 297                 return -ENOMEM;
 298
 299         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 300                                    ibmebus_match_path))) {
 301                 of_device_unregister(to_platform_device(dev));
 302
 303                 kfree(path);
 304                 return count;
 305         } else {
 306                 printk(KERN_WARNING "%s: %s not on the bus\n",
 307                        __func__, path);
 308
 309                 kfree(path);
 310                 return -ENODEV;
 311         }
 312 }
 313
 314
 315 static struct bus_attribute ibmebus_bus_attrs[] = {
 316         __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
 317         __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
 318         __ATTR_NULL
 319 };
 320
 321 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
 322 {
 323         const struct of_device_id *matches = drv->of_match_table;
 324
 325         if (!matches)
 326                 return 0;
 327
 328         return of_match_device(matches, dev) != NULL;
 329 }
 330
 331 static int ibmebus_bus_device_probe(struct device *dev)
 332 {
 333         int error = -ENODEV;
 334         struct of_platform_driver *drv;
 335         struct platform_device *of_dev;
 336         const struct of_device_id *match;
 337
 338         drv = to_of_platform_driver(dev->driver);
 339         of_dev = to_platform_device(dev);
 340
 341         if (!drv->probe)
 342                 return error;
 343
 344         of_dev_get(of_dev);
 345
 346         match = of_match_device(drv->driver.of_match_table, dev);
 347         if (match)
 348                 error = drv->probe(of_dev, match);
 349         if (error)
 350                 of_dev_put(of_dev);
 351
 352         return error;
 353 }
 354
 355 static int ibmebus_bus_device_remove(struct device *dev)
 356 {
 357         struct platform_device *of_dev = to_platform_device(dev);
 358         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 359
 360         if (dev->driver && drv->remove)
 361                 drv->remove(of_dev);
 362         return 0;
 363 }
 364
 365 static void ibmebus_bus_device_shutdown(struct device *dev)
 366 {
 367         struct platform_device *of_dev = to_platform_device(dev);
 368         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 369
 370         if (dev->driver && drv->shutdown)
 371                 drv->shutdown(of_dev);
 372 }
 373
 374 /*
 375  * ibmebus_bus_device_attrs
 376  */
 377 static ssize_t devspec_show(struct device *dev,
 378                                 struct device_attribute *attr, char *buf)
 379 {
 380         struct platform_device *ofdev;
 381
 382         ofdev = to_platform_device(dev);
 383         return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
 384 }
 385
 386 static ssize_t name_show(struct device *dev,
 387                                 struct device_attribute *attr, char *buf)
 388 {
 389         struct platform_device *ofdev;
 390
 391         ofdev = to_platform_device(dev);
 392         return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
 393 }
 394
 395 static ssize_t modalias_show(struct device *dev,
 396                                 struct device_attribute *attr, char *buf)
 397 {
 398         ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
 399         buf[len] = '\n';
 400         buf[len+1] = 0;
 401         return len+1;
 402 }
 403
 404 struct device_attribute ibmebus_bus_device_attrs[] = {
 405         __ATTR_RO(devspec),
 406         __ATTR_RO(name),
 407         __ATTR_RO(modalias),
 408         __ATTR_NULL
 409 };
 410
 411 #ifdef CONFIG_PM_SLEEP
 412 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
 413 {
 414         struct platform_device *of_dev = to_platform_device(dev);
 415         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 416         int ret = 0;
 417
 418         if (dev->driver && drv->suspend)
 419                 ret = drv->suspend(of_dev, mesg);
 420         return ret;
 421 }
 422
 423 static int ibmebus_bus_legacy_resume(struct device *dev)
 424 {
 425         struct platform_device *of_dev = to_platform_device(dev);
 426         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 427         int ret = 0;
 428
 429         if (dev->driver && drv->resume)
 430                 ret = drv->resume(of_dev);
 431         return ret;
 432 }
 433
 434 static int ibmebus_bus_pm_prepare(struct device *dev)
 435 {
 436         struct device_driver *drv = dev->driver;
 437         int ret = 0;
 438
 439         if (drv && drv->pm && drv->pm->prepare)
 440                 ret = drv->pm->prepare(dev);
 441
 442         return ret;
 443 }
 444
 445 static void ibmebus_bus_pm_complete(struct device *dev)
 446 {
 447         struct device_driver *drv = dev->driver;
 448
 449         if (drv && drv->pm && drv->pm->complete)
 450                 drv->pm->complete(dev);
 451 }
 452
 453 #ifdef CONFIG_SUSPEND
 454
 455 static int ibmebus_bus_pm_suspend(struct device *dev)
 456 {
 457         struct device_driver *drv = dev->driver;
 458         int ret = 0;
 459
 460         if (!drv)
 461                 return 0;
 462
 463         if (drv->pm) {
 464                 if (drv->pm->suspend)
 465                         ret = drv->pm->suspend(dev);
 466         } else {
 467                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
 468         }
 469
 470         return ret;
 471 }
 472
 473 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
 474 {
 475         struct device_driver *drv = dev->driver;
 476         int ret = 0;
 477
 478         if (!drv)
 479                 return 0;
 480
 481         if (drv->pm) {
 482                 if (drv->pm->suspend_noirq)
 483                         ret = drv->pm->suspend_noirq(dev);
 484         }
 485
 486         return ret;
 487 }
 488
 489 static int ibmebus_bus_pm_resume(struct device *dev)
 490 {
 491         struct device_driver *drv = dev->driver;
 492         int ret = 0;
 493
 494         if (!drv)
 495                 return 0;
 496
 497         if (drv->pm) {
 498                 if (drv->pm->resume)
 499                         ret = drv->pm->resume(dev);
 500         } else {
 501                 ret = ibmebus_bus_legacy_resume(dev);
 502         }
 503
 504         return ret;
 505 }
 506
 507 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
 508 {
 509         struct device_driver *drv = dev->driver;
 510         int ret = 0;
 511
 512         if (!drv)
 513                 return 0;
 514
 515         if (drv->pm) {
 516                 if (drv->pm->resume_noirq)
 517                         ret = drv->pm->resume_noirq(dev);
 518         }
 519
 520         return ret;
 521 }
 522
 523 #else /* !CONFIG_SUSPEND */
 524
 525 #define ibmebus_bus_pm_suspend          NULL
 526 #define ibmebus_bus_pm_resume           NULL
 527 #define ibmebus_bus_pm_suspend_noirq    NULL
 528 #define ibmebus_bus_pm_resume_noirq     NULL
 529
 530 #endif /* !CONFIG_SUSPEND */
 531
 532 #ifdef CONFIG_HIBERNATE_CALLBACKS
 533
 534 static int ibmebus_bus_pm_freeze(struct device *dev)
 535 {
 536         struct device_driver *drv = dev->driver;
 537         int ret = 0;
 538
 539         if (!drv)
 540                 return 0;
 541
 542         if (drv->pm) {
 543                 if (drv->pm->freeze)
 544                         ret = drv->pm->freeze(dev);
 545         } else {
 546                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
 547         }
 548
 549         return ret;
 550 }
 551
 552 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
 553 {
 554         struct device_driver *drv = dev->driver;
 555         int ret = 0;
 556
 557         if (!drv)
 558                 return 0;
 559
 560         if (drv->pm) {
 561                 if (drv->pm->freeze_noirq)
 562                         ret = drv->pm->freeze_noirq(dev);
 563         }
 564
 565         return ret;
 566 }
 567
 568 static int ibmebus_bus_pm_thaw(struct device *dev)
 569 {
 570         struct device_driver *drv = dev->driver;
 571         int ret = 0;
 572
 573         if (!drv)
 574                 return 0;
 575
 576         if (drv->pm) {
 577                 if (drv->pm->thaw)
 578                         ret = drv->pm->thaw(dev);
 579         } else {
 580                 ret = ibmebus_bus_legacy_resume(dev);
 581         }
 582
 583         return ret;
 584 }
 585
 586 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
 587 {
 588         struct device_driver *drv = dev->driver;
 589         int ret = 0;
 590
 591         if (!drv)
 592                 return 0;
 593
 594         if (drv->pm) {
 595                 if (drv->pm->thaw_noirq)
 596                         ret = drv->pm->thaw_noirq(dev);
 597         }
 598
 599         return ret;
 600 }
 601
 602 static int ibmebus_bus_pm_poweroff(struct device *dev)
 603 {
 604         struct device_driver *drv = dev->driver;
 605         int ret = 0;
 606
 607         if (!drv)
 608                 return 0;
 609
 610         if (drv->pm) {
 611                 if (drv->pm->poweroff)
 612                         ret = drv->pm->poweroff(dev);
 613         } else {
 614                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
 615         }
 616
 617         return ret;
 618 }
 619
 620 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
 621 {
 622         struct device_driver *drv = dev->driver;
 623         int ret = 0;
 624
 625         if (!drv)
 626                 return 0;
 627
 628         if (drv->pm) {
 629                 if (drv->pm->poweroff_noirq)
 630                         ret = drv->pm->poweroff_noirq(dev);
 631         }
 632
 633         return ret;
 634 }
 635
 636 static int ibmebus_bus_pm_restore(struct device *dev)
 637 {
 638         struct device_driver *drv = dev->driver;
 639         int ret = 0;
 640
 641         if (!drv)
 642                 return 0;
 643
 644         if (drv->pm) {
 645                 if (drv->pm->restore)
 646                         ret = drv->pm->restore(dev);
 647         } else {
 648                 ret = ibmebus_bus_legacy_resume(dev);
 649         }
 650
 651         return ret;
 652 }
 653
 654 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
 655 {
 656         struct device_driver *drv = dev->driver;
 657         int ret = 0;
 658
 659         if (!drv)
 660                 return 0;
 661
 662         if (drv->pm) {
 663                 if (drv->pm->restore_noirq)
 664                         ret = drv->pm->restore_noirq(dev);
 665         }
 666
 667         return ret;
 668 }
 669
 670 #else /* !CONFIG_HIBERNATE_CALLBACKS */
 671
 672 #define ibmebus_bus_pm_freeze           NULL
 673 #define ibmebus_bus_pm_thaw             NULL
 674 #define ibmebus_bus_pm_poweroff         NULL
 675 #define ibmebus_bus_pm_restore          NULL
 676 #define ibmebus_bus_pm_freeze_noirq     NULL
 677 #define ibmebus_bus_pm_thaw_noirq               NULL
 678 #define ibmebus_bus_pm_poweroff_noirq   NULL
 679 #define ibmebus_bus_pm_restore_noirq    NULL
 680
 681 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
 682
 683 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
 684         .prepare = ibmebus_bus_pm_prepare,
 685         .complete = ibmebus_bus_pm_complete,
 686         .suspend = ibmebus_bus_pm_suspend,
 687         .resume = ibmebus_bus_pm_resume,
 688         .freeze = ibmebus_bus_pm_freeze,
 689         .thaw = ibmebus_bus_pm_thaw,
 690         .poweroff = ibmebus_bus_pm_poweroff,
 691         .restore = ibmebus_bus_pm_restore,
 692         .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
 693         .resume_noirq = ibmebus_bus_pm_resume_noirq,
 694         .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
 695         .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
 696         .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
 697         .restore_noirq = ibmebus_bus_pm_restore_noirq,
 698 };
 699
 700 #define IBMEBUS_BUS_PM_OPS_PTR  (&ibmebus_bus_dev_pm_ops)
 701
 702 #else /* !CONFIG_PM_SLEEP */
 703
 704 #define IBMEBUS_BUS_PM_OPS_PTR  NULL
 705
 706 #endif /* !CONFIG_PM_SLEEP */
 707
 708 struct bus_type ibmebus_bus_type = {
 709         .name      = "ibmebus",
 710         .uevent    = of_device_uevent,
 711         .bus_attrs = ibmebus_bus_attrs,
 712         .match     = ibmebus_bus_bus_match,
 713         .probe     = ibmebus_bus_device_probe,
 714         .remove    = ibmebus_bus_device_remove,
 715         .shutdown  = ibmebus_bus_device_shutdown,
 716         .dev_attrs = ibmebus_bus_device_attrs,
 717         .pm        = IBMEBUS_BUS_PM_OPS_PTR,
 718 };
 719 EXPORT_SYMBOL(ibmebus_bus_type);
 720
 721 static int __init ibmebus_bus_init(void)
 722 {
 723         int err;
 724
 725         printk(KERN_INFO "IBM eBus Device Driver\n");
 726
 727         err = bus_register(&ibmebus_bus_type);
 728         if (err) {
 729                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
 730                        __func__);
 731                 return err;
 732         }
 733
 734         err = device_register(&ibmebus_bus_device);
 735         if (err) {
 736                 printk(KERN_WARNING "%s: device_register returned %i\n",
 737                        __func__, err);
 738                 bus_unregister(&ibmebus_bus_type);
 739
 740                 return err;
 741         }
 742
 743         err = ibmebus_create_devices(ibmebus_matches);
 744         if (err) {
 745                 device_unregister(&ibmebus_bus_device);
 746                 bus_unregister(&ibmebus_bus_type);
 747                 return err;
 748         }
 749
 750         return 0;
 751 }
 752 postcore_initcall(ibmebus_bus_init);