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                                     struct dma_attrs *attrs)
  70 {
  71         void *mem;
  72
  73         mem = kmalloc(size, flag);
  74         *dma_handle = (dma_addr_t)mem;
  75
  76         return mem;
  77 }
  78
  79 static void ibmebus_free_coherent(struct device *dev,
  80                                   size_t size, void *vaddr,
  81                                   dma_addr_t dma_handle,
  82                                   struct dma_attrs *attrs)
  83 {
  84         kfree(vaddr);
  85 }
  86
  87 static dma_addr_t ibmebus_map_page(struct device *dev,
  88                                    struct page *page,
  89                                    unsigned long offset,
  90                                    size_t size,
  91                                    enum dma_data_direction direction,
  92                                    struct dma_attrs *attrs)
  93 {
  94         return (dma_addr_t)(page_address(page) + offset);
  95 }
  96
  97 static void ibmebus_unmap_page(struct device *dev,
  98                                dma_addr_t dma_addr,
  99                                size_t size,
 100                                enum dma_data_direction direction,
 101                                struct dma_attrs *attrs)
 102 {
 103         return;
 104 }
 105
 106 static int ibmebus_map_sg(struct device *dev,
 107                           struct scatterlist *sgl,
 108                           int nents, enum dma_data_direction direction,
 109                           struct dma_attrs *attrs)
 110 {
 111         struct scatterlist *sg;
 112         int i;
 113
 114         for_each_sg(sgl, sg, nents, i) {
 115                 sg->dma_address = (dma_addr_t) sg_virt(sg);
 116                 sg->dma_length = sg->length;
 117         }
 118
 119         return nents;
 120 }
 121
 122 static void ibmebus_unmap_sg(struct device *dev,
 123                              struct scatterlist *sg,
 124                              int nents, enum dma_data_direction direction,
 125                              struct dma_attrs *attrs)
 126 {
 127         return;
 128 }
 129
 130 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 131 {
 132         return mask == DMA_BIT_MASK(64);
 133 }
 134
 135 static u64 ibmebus_dma_get_required_mask(struct device *dev)
 136 {
 137         return DMA_BIT_MASK(64);
 138 }
 139
 140 static struct dma_map_ops ibmebus_dma_ops = {
 141         .alloc              = ibmebus_alloc_coherent,
 142         .free               = ibmebus_free_coherent,
 143         .map_sg             = ibmebus_map_sg,
 144         .unmap_sg           = ibmebus_unmap_sg,
 145         .dma_supported      = ibmebus_dma_supported,
 146         .get_required_mask  = ibmebus_dma_get_required_mask,
 147         .map_page           = ibmebus_map_page,
 148         .unmap_page         = ibmebus_unmap_page,
 149 };
 150
 151 static int ibmebus_match_path(struct device *dev, void *data)
 152 {
 153         struct device_node *dn = to_platform_device(dev)->dev.of_node;
 154         return (dn->full_name &&
 155                 (strcasecmp((char *)data, dn->full_name) == 0));
 156 }
 157
 158 static int ibmebus_match_node(struct device *dev, void *data)
 159 {
 160         return to_platform_device(dev)->dev.of_node == data;
 161 }
 162
 163 static int ibmebus_create_device(struct device_node *dn)
 164 {
 165         struct platform_device *dev;
 166         int ret;
 167
 168         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
 169         if (!dev)
 170                 return -ENOMEM;
 171
 172         dev->dev.bus = &ibmebus_bus_type;
 173         dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
 174
 175         ret = of_device_add(dev);
 176         if (ret)
 177                 platform_device_put(dev);
 178         return ret;
 179 }
 180
 181 static int ibmebus_create_devices(const struct of_device_id *matches)
 182 {
 183         struct device_node *root, *child;
 184         int ret = 0;
 185
 186         root = of_find_node_by_path("/");
 187
 188         for_each_child_of_node(root, child) {
 189                 if (!of_match_node(matches, child))
 190                         continue;
 191
 192                 if (bus_find_device(&ibmebus_bus_type, NULL, child,
 193                                     ibmebus_match_node))
 194                         continue;
 195
 196                 ret = ibmebus_create_device(child);
 197                 if (ret) {
 198                         printk(KERN_ERR "%s: failed to create device (%i)",
 199                                __func__, ret);
 200                         of_node_put(child);
 201                         break;
 202                 }
 203         }
 204
 205         of_node_put(root);
 206         return ret;
 207 }
 208
 209 int ibmebus_register_driver(struct of_platform_driver *drv)
 210 {
 211         /* If the driver uses devices that ibmebus doesn't know, add them */
 212         ibmebus_create_devices(drv->driver.of_match_table);
 213
 214         drv->driver.bus = &ibmebus_bus_type;
 215         return driver_register(&drv->driver);
 216 }
 217 EXPORT_SYMBOL(ibmebus_register_driver);
 218
 219 void ibmebus_unregister_driver(struct of_platform_driver *drv)
 220 {
 221         driver_unregister(&drv->driver);
 222 }
 223 EXPORT_SYMBOL(ibmebus_unregister_driver);
 224
 225 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 226                         unsigned long irq_flags, const char *devname,
 227                         void *dev_id)
 228 {
 229         unsigned int irq = irq_create_mapping(NULL, ist);
 230
 231         if (irq == NO_IRQ)
 232                 return -EINVAL;
 233
 234         return request_irq(irq, handler, irq_flags, devname, dev_id);
 235 }
 236 EXPORT_SYMBOL(ibmebus_request_irq);
 237
 238 void ibmebus_free_irq(u32 ist, void *dev_id)
 239 {
 240         unsigned int irq = irq_find_mapping(NULL, ist);
 241
 242         free_irq(irq, dev_id);
 243         irq_dispose_mapping(irq);
 244 }
 245 EXPORT_SYMBOL(ibmebus_free_irq);
 246
 247 static char *ibmebus_chomp(const char *in, size_t count)
 248 {
 249         char *out = kmalloc(count + 1, GFP_KERNEL);
 250
 251         if (!out)
 252                 return NULL;
 253
 254         memcpy(out, in, count);
 255         out[count] = '\0';
 256         if (out[count - 1] == '\n')
 257                 out[count - 1] = '\0';
 258
 259         return out;
 260 }
 261
 262 static ssize_t ibmebus_store_probe(struct bus_type *bus,
 263                                    const char *buf, size_t count)
 264 {
 265         struct device_node *dn = NULL;
 266         char *path;
 267         ssize_t rc = 0;
 268
 269         path = ibmebus_chomp(buf, count);
 270         if (!path)
 271                 return -ENOMEM;
 272
 273         if (bus_find_device(&ibmebus_bus_type, NULL, path,
 274                             ibmebus_match_path)) {
 275                 printk(KERN_WARNING "%s: %s has already been probed\n",
 276                        __func__, path);
 277                 rc = -EEXIST;
 278                 goto out;
 279         }
 280
 281         if ((dn = of_find_node_by_path(path))) {
 282                 rc = ibmebus_create_device(dn);
 283                 of_node_put(dn);
 284         } else {
 285                 printk(KERN_WARNING "%s: no such device node: %s\n",
 286                        __func__, path);
 287                 rc = -ENODEV;
 288         }
 289
 290 out:
 291         kfree(path);
 292         if (rc)
 293                 return rc;
 294         return count;
 295 }
 296
 297 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 298                                     const char *buf, size_t count)
 299 {
 300         struct device *dev;
 301         char *path;
 302
 303         path = ibmebus_chomp(buf, count);
 304         if (!path)
 305                 return -ENOMEM;
 306
 307         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 308                                    ibmebus_match_path))) {
 309                 of_device_unregister(to_platform_device(dev));
 310
 311                 kfree(path);
 312                 return count;
 313         } else {
 314                 printk(KERN_WARNING "%s: %s not on the bus\n",
 315                        __func__, path);
 316
 317                 kfree(path);
 318                 return -ENODEV;
 319         }
 320 }
 321
 322
 323 static struct bus_attribute ibmebus_bus_attrs[] = {
 324         __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
 325         __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
 326         __ATTR_NULL
 327 };
 328
 329 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
 330 {
 331         const struct of_device_id *matches = drv->of_match_table;
 332
 333         if (!matches)
 334                 return 0;
 335
 336         return of_match_device(matches, dev) != NULL;
 337 }
 338
 339 static int ibmebus_bus_device_probe(struct device *dev)
 340 {
 341         int error = -ENODEV;
 342         struct of_platform_driver *drv;
 343         struct platform_device *of_dev;
 344         const struct of_device_id *match;
 345
 346         drv = to_of_platform_driver(dev->driver);
 347         of_dev = to_platform_device(dev);
 348
 349         if (!drv->probe)
 350                 return error;
 351
 352         of_dev_get(of_dev);
 353
 354         match = of_match_device(drv->driver.of_match_table, dev);
 355         if (match)
 356                 error = drv->probe(of_dev, match);
 357         if (error)
 358                 of_dev_put(of_dev);
 359
 360         return error;
 361 }
 362
 363 static int ibmebus_bus_device_remove(struct device *dev)
 364 {
 365         struct platform_device *of_dev = to_platform_device(dev);
 366         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 367
 368         if (dev->driver && drv->remove)
 369                 drv->remove(of_dev);
 370         return 0;
 371 }
 372
 373 static void ibmebus_bus_device_shutdown(struct device *dev)
 374 {
 375         struct platform_device *of_dev = to_platform_device(dev);
 376         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 377
 378         if (dev->driver && drv->shutdown)
 379                 drv->shutdown(of_dev);
 380 }
 381
 382 /*
 383  * ibmebus_bus_device_attrs
 384  */
 385 static ssize_t devspec_show(struct device *dev,
 386                                 struct device_attribute *attr, char *buf)
 387 {
 388         struct platform_device *ofdev;
 389
 390         ofdev = to_platform_device(dev);
 391         return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
 392 }
 393
 394 static ssize_t name_show(struct device *dev,
 395                                 struct device_attribute *attr, char *buf)
 396 {
 397         struct platform_device *ofdev;
 398
 399         ofdev = to_platform_device(dev);
 400         return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
 401 }
 402
 403 static ssize_t modalias_show(struct device *dev,
 404                                 struct device_attribute *attr, char *buf)
 405 {
 406         ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
 407         buf[len] = '\n';
 408         buf[len+1] = 0;
 409         return len+1;
 410 }
 411
 412 struct device_attribute ibmebus_bus_device_attrs[] = {
 413         __ATTR_RO(devspec),
 414         __ATTR_RO(name),
 415         __ATTR_RO(modalias),
 416         __ATTR_NULL
 417 };
 418
 419 #ifdef CONFIG_PM_SLEEP
 420 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
 421 {
 422         struct platform_device *of_dev = to_platform_device(dev);
 423         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 424         int ret = 0;
 425
 426         if (dev->driver && drv->suspend)
 427                 ret = drv->suspend(of_dev, mesg);
 428         return ret;
 429 }
 430
 431 static int ibmebus_bus_legacy_resume(struct device *dev)
 432 {
 433         struct platform_device *of_dev = to_platform_device(dev);
 434         struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
 435         int ret = 0;
 436
 437         if (dev->driver && drv->resume)
 438                 ret = drv->resume(of_dev);
 439         return ret;
 440 }
 441
 442 static int ibmebus_bus_pm_prepare(struct device *dev)
 443 {
 444         struct device_driver *drv = dev->driver;
 445         int ret = 0;
 446
 447         if (drv && drv->pm && drv->pm->prepare)
 448                 ret = drv->pm->prepare(dev);
 449
 450         return ret;
 451 }
 452
 453 static void ibmebus_bus_pm_complete(struct device *dev)
 454 {
 455         struct device_driver *drv = dev->driver;
 456
 457         if (drv && drv->pm && drv->pm->complete)
 458                 drv->pm->complete(dev);
 459 }
 460
 461 #ifdef CONFIG_SUSPEND
 462
 463 static int ibmebus_bus_pm_suspend(struct device *dev)
 464 {
 465         struct device_driver *drv = dev->driver;
 466         int ret = 0;
 467
 468         if (!drv)
 469                 return 0;
 470
 471         if (drv->pm) {
 472                 if (drv->pm->suspend)
 473                         ret = drv->pm->suspend(dev);
 474         } else {
 475                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
 476         }
 477
 478         return ret;
 479 }
 480
 481 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
 482 {
 483         struct device_driver *drv = dev->driver;
 484         int ret = 0;
 485
 486         if (!drv)
 487                 return 0;
 488
 489         if (drv->pm) {
 490                 if (drv->pm->suspend_noirq)
 491                         ret = drv->pm->suspend_noirq(dev);
 492         }
 493
 494         return ret;
 495 }
 496
 497 static int ibmebus_bus_pm_resume(struct device *dev)
 498 {
 499         struct device_driver *drv = dev->driver;
 500         int ret = 0;
 501
 502         if (!drv)
 503                 return 0;
 504
 505         if (drv->pm) {
 506                 if (drv->pm->resume)
 507                         ret = drv->pm->resume(dev);
 508         } else {
 509                 ret = ibmebus_bus_legacy_resume(dev);
 510         }
 511
 512         return ret;
 513 }
 514
 515 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
 516 {
 517         struct device_driver *drv = dev->driver;
 518         int ret = 0;
 519
 520         if (!drv)
 521                 return 0;
 522
 523         if (drv->pm) {
 524                 if (drv->pm->resume_noirq)
 525                         ret = drv->pm->resume_noirq(dev);
 526         }
 527
 528         return ret;
 529 }
 530
 531 #else /* !CONFIG_SUSPEND */
 532
 533 #define ibmebus_bus_pm_suspend          NULL
 534 #define ibmebus_bus_pm_resume           NULL
 535 #define ibmebus_bus_pm_suspend_noirq    NULL
 536 #define ibmebus_bus_pm_resume_noirq     NULL
 537
 538 #endif /* !CONFIG_SUSPEND */
 539
 540 #ifdef CONFIG_HIBERNATE_CALLBACKS
 541
 542 static int ibmebus_bus_pm_freeze(struct device *dev)
 543 {
 544         struct device_driver *drv = dev->driver;
 545         int ret = 0;
 546
 547         if (!drv)
 548                 return 0;
 549
 550         if (drv->pm) {
 551                 if (drv->pm->freeze)
 552                         ret = drv->pm->freeze(dev);
 553         } else {
 554                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
 555         }
 556
 557         return ret;
 558 }
 559
 560 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
 561 {
 562         struct device_driver *drv = dev->driver;
 563         int ret = 0;
 564
 565         if (!drv)
 566                 return 0;
 567
 568         if (drv->pm) {
 569                 if (drv->pm->freeze_noirq)
 570                         ret = drv->pm->freeze_noirq(dev);
 571         }
 572
 573         return ret;
 574 }
 575
 576 static int ibmebus_bus_pm_thaw(struct device *dev)
 577 {
 578         struct device_driver *drv = dev->driver;
 579         int ret = 0;
 580
 581         if (!drv)
 582                 return 0;
 583
 584         if (drv->pm) {
 585                 if (drv->pm->thaw)
 586                         ret = drv->pm->thaw(dev);
 587         } else {
 588                 ret = ibmebus_bus_legacy_resume(dev);
 589         }
 590
 591         return ret;
 592 }
 593
 594 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
 595 {
 596         struct device_driver *drv = dev->driver;
 597         int ret = 0;
 598
 599         if (!drv)
 600                 return 0;
 601
 602         if (drv->pm) {
 603                 if (drv->pm->thaw_noirq)
 604                         ret = drv->pm->thaw_noirq(dev);
 605         }
 606
 607         return ret;
 608 }
 609
 610 static int ibmebus_bus_pm_poweroff(struct device *dev)
 611 {
 612         struct device_driver *drv = dev->driver;
 613         int ret = 0;
 614
 615         if (!drv)
 616                 return 0;
 617
 618         if (drv->pm) {
 619                 if (drv->pm->poweroff)
 620                         ret = drv->pm->poweroff(dev);
 621         } else {
 622                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
 623         }
 624
 625         return ret;
 626 }
 627
 628 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
 629 {
 630         struct device_driver *drv = dev->driver;
 631         int ret = 0;
 632
 633         if (!drv)
 634                 return 0;
 635
 636         if (drv->pm) {
 637                 if (drv->pm->poweroff_noirq)
 638                         ret = drv->pm->poweroff_noirq(dev);
 639         }
 640
 641         return ret;
 642 }
 643
 644 static int ibmebus_bus_pm_restore(struct device *dev)
 645 {
 646         struct device_driver *drv = dev->driver;
 647         int ret = 0;
 648
 649         if (!drv)
 650                 return 0;
 651
 652         if (drv->pm) {
 653                 if (drv->pm->restore)
 654                         ret = drv->pm->restore(dev);
 655         } else {
 656                 ret = ibmebus_bus_legacy_resume(dev);
 657         }
 658
 659         return ret;
 660 }
 661
 662 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
 663 {
 664         struct device_driver *drv = dev->driver;
 665         int ret = 0;
 666
 667         if (!drv)
 668                 return 0;
 669
 670         if (drv->pm) {
 671                 if (drv->pm->restore_noirq)
 672                         ret = drv->pm->restore_noirq(dev);
 673         }
 674
 675         return ret;
 676 }
 677
 678 #else /* !CONFIG_HIBERNATE_CALLBACKS */
 679
 680 #define ibmebus_bus_pm_freeze           NULL
 681 #define ibmebus_bus_pm_thaw             NULL
 682 #define ibmebus_bus_pm_poweroff         NULL
 683 #define ibmebus_bus_pm_restore          NULL
 684 #define ibmebus_bus_pm_freeze_noirq     NULL
 685 #define ibmebus_bus_pm_thaw_noirq               NULL
 686 #define ibmebus_bus_pm_poweroff_noirq   NULL
 687 #define ibmebus_bus_pm_restore_noirq    NULL
 688
 689 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
 690
 691 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
 692         .prepare = ibmebus_bus_pm_prepare,
 693         .complete = ibmebus_bus_pm_complete,
 694         .suspend = ibmebus_bus_pm_suspend,
 695         .resume = ibmebus_bus_pm_resume,
 696         .freeze = ibmebus_bus_pm_freeze,
 697         .thaw = ibmebus_bus_pm_thaw,
 698         .poweroff = ibmebus_bus_pm_poweroff,
 699         .restore = ibmebus_bus_pm_restore,
 700         .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
 701         .resume_noirq = ibmebus_bus_pm_resume_noirq,
 702         .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
 703         .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
 704         .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
 705         .restore_noirq = ibmebus_bus_pm_restore_noirq,
 706 };
 707
 708 #define IBMEBUS_BUS_PM_OPS_PTR  (&ibmebus_bus_dev_pm_ops)
 709
 710 #else /* !CONFIG_PM_SLEEP */
 711
 712 #define IBMEBUS_BUS_PM_OPS_PTR  NULL
 713
 714 #endif /* !CONFIG_PM_SLEEP */
 715
 716 struct bus_type ibmebus_bus_type = {
 717         .name      = "ibmebus",
 718         .uevent    = of_device_uevent,
 719         .bus_attrs = ibmebus_bus_attrs,
 720         .match     = ibmebus_bus_bus_match,
 721         .probe     = ibmebus_bus_device_probe,
 722         .remove    = ibmebus_bus_device_remove,
 723         .shutdown  = ibmebus_bus_device_shutdown,
 724         .dev_attrs = ibmebus_bus_device_attrs,
 725         .pm        = IBMEBUS_BUS_PM_OPS_PTR,
 726 };
 727 EXPORT_SYMBOL(ibmebus_bus_type);
 728
 729 static int __init ibmebus_bus_init(void)
 730 {
 731         int err;
 732
 733         printk(KERN_INFO "IBM eBus Device Driver\n");
 734
 735         err = bus_register(&ibmebus_bus_type);
 736         if (err) {
 737                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
 738                        __func__);
 739                 return err;
 740         }
 741
 742         err = device_register(&ibmebus_bus_device);
 743         if (err) {
 744                 printk(KERN_WARNING "%s: device_register returned %i\n",
 745                        __func__, err);
 746                 bus_unregister(&ibmebus_bus_type);
 747
 748                 return err;
 749         }
 750
 751         err = ibmebus_create_devices(ibmebus_matches);
 752         if (err) {
 753                 device_unregister(&ibmebus_bus_device);
 754                 bus_unregister(&ibmebus_bus_type);
 755                 return err;
 756         }
 757
 758         return 0;
 759 }
 760 postcore_initcall(ibmebus_bus_init);