kernel/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
  51 static struct device ibmebus_bus_device = { /* fake "parent" device */
  52         .init_name = "ibmebus",
  53 };
  54
  55 struct bus_type ibmebus_bus_type;
  56
  57 /* These devices will automatically be added to the bus during init */
  58 static const struct of_device_id ibmebus_matches[] __initconst = {
  59         { .compatible = "IBM,lhca" },
  60         { .compatible = "IBM,lhea" },
  61         {},
  62 };
  63
  64 static void *ibmebus_alloc_coherent(struct device *dev,
  65                                     size_t size,
  66                                     dma_addr_t *dma_handle,
  67                                     gfp_t flag,
  68                                     struct dma_attrs *attrs)
  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                                   struct dma_attrs *attrs)
  82 {
  83         kfree(vaddr);
  84 }
  85
  86 static dma_addr_t ibmebus_map_page(struct device *dev,
  87                                    struct page *page,
  88                                    unsigned long offset,
  89                                    size_t size,
  90                                    enum dma_data_direction direction,
  91                                    struct dma_attrs *attrs)
  92 {
  93         return (dma_addr_t)(page_address(page) + offset);
  94 }
  95
  96 static void ibmebus_unmap_page(struct device *dev,
  97                                dma_addr_t dma_addr,
  98                                size_t size,
  99                                enum dma_data_direction direction,
 100                                struct dma_attrs *attrs)
 101 {
 102         return;
 103 }
 104
 105 static int ibmebus_map_sg(struct device *dev,
 106                           struct scatterlist *sgl,
 107                           int nents, enum dma_data_direction direction,
 108                           struct dma_attrs *attrs)
 109 {
 110         struct scatterlist *sg;
 111         int i;
 112
 113         for_each_sg(sgl, sg, nents, i) {
 114                 sg->dma_address = (dma_addr_t) sg_virt(sg);
 115                 sg->dma_length = sg->length;
 116         }
 117
 118         return nents;
 119 }
 120
 121 static void ibmebus_unmap_sg(struct device *dev,
 122                              struct scatterlist *sg,
 123                              int nents, enum dma_data_direction direction,
 124                              struct dma_attrs *attrs)
 125 {
 126         return;
 127 }
 128
 129 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 130 {
 131         return mask == DMA_BIT_MASK(64);
 132 }
 133
 134 static u64 ibmebus_dma_get_required_mask(struct device *dev)
 135 {
 136         return DMA_BIT_MASK(64);
 137 }
 138
 139 static struct dma_map_ops ibmebus_dma_ops = {
 140         .alloc              = ibmebus_alloc_coherent,
 141         .free               = ibmebus_free_coherent,
 142         .map_sg             = ibmebus_map_sg,
 143         .unmap_sg           = ibmebus_unmap_sg,
 144         .dma_supported      = ibmebus_dma_supported,
 145         .get_required_mask  = ibmebus_dma_get_required_mask,
 146         .map_page           = ibmebus_map_page,
 147         .unmap_page         = ibmebus_unmap_page,
 148 };
 149
 150 static int ibmebus_match_path(struct device *dev, void *data)
 151 {
 152         struct device_node *dn = to_platform_device(dev)->dev.of_node;
 153         return (dn->full_name &&
 154                 (strcasecmp((char *)data, dn->full_name) == 0));
 155 }
 156
 157 static int ibmebus_match_node(struct device *dev, void *data)
 158 {
 159         return to_platform_device(dev)->dev.of_node == data;
 160 }
 161
 162 static int ibmebus_create_device(struct device_node *dn)
 163 {
 164         struct platform_device *dev;
 165         int ret;
 166
 167         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
 168         if (!dev)
 169                 return -ENOMEM;
 170
 171         dev->dev.bus = &ibmebus_bus_type;
 172         dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
 173
 174         ret = of_device_add(dev);
 175         if (ret)
 176                 platform_device_put(dev);
 177         return ret;
 178 }
 179
 180 static int ibmebus_create_devices(const struct of_device_id *matches)
 181 {
 182         struct device_node *root, *child;
 183         struct device *dev;
 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                 dev = bus_find_device(&ibmebus_bus_type, NULL, child,
 193                                       ibmebus_match_node);
 194                 if (dev) {
 195                         put_device(dev);
 196                         continue;
 197                 }
 198
 199                 ret = ibmebus_create_device(child);
 200                 if (ret) {
 201                         printk(KERN_ERR "%s: failed to create device (%i)",
 202                                __func__, ret);
 203                         of_node_put(child);
 204                         break;
 205                 }
 206         }
 207
 208         of_node_put(root);
 209         return ret;
 210 }
 211
 212 int ibmebus_register_driver(struct platform_driver *drv)
 213 {
 214         /* If the driver uses devices that ibmebus doesn't know, add them */
 215         ibmebus_create_devices(drv->driver.of_match_table);
 216
 217         drv->driver.bus = &ibmebus_bus_type;
 218         return driver_register(&drv->driver);
 219 }
 220 EXPORT_SYMBOL(ibmebus_register_driver);
 221
 222 void ibmebus_unregister_driver(struct platform_driver *drv)
 223 {
 224         driver_unregister(&drv->driver);
 225 }
 226 EXPORT_SYMBOL(ibmebus_unregister_driver);
 227
 228 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 229                         unsigned long irq_flags, const char *devname,
 230                         void *dev_id)
 231 {
 232         unsigned int irq = irq_create_mapping(NULL, ist);
 233
 234         if (irq == NO_IRQ)
 235                 return -EINVAL;
 236
 237         return request_irq(irq, handler, irq_flags, devname, dev_id);
 238 }
 239 EXPORT_SYMBOL(ibmebus_request_irq);
 240
 241 void ibmebus_free_irq(u32 ist, void *dev_id)
 242 {
 243         unsigned int irq = irq_find_mapping(NULL, ist);
 244
 245         free_irq(irq, dev_id);
 246         irq_dispose_mapping(irq);
 247 }
 248 EXPORT_SYMBOL(ibmebus_free_irq);
 249
 250 static char *ibmebus_chomp(const char *in, size_t count)
 251 {
 252         char *out = kmalloc(count + 1, GFP_KERNEL);
 253
 254         if (!out)
 255                 return NULL;
 256
 257         memcpy(out, in, count);
 258         out[count] = '\0';
 259         if (out[count - 1] == '\n')
 260                 out[count - 1] = '\0';
 261
 262         return out;
 263 }
 264
 265 static ssize_t ibmebus_store_probe(struct bus_type *bus,
 266                                    const char *buf, size_t count)
 267 {
 268         struct device_node *dn = NULL;
 269         struct device *dev;
 270         char *path;
 271         ssize_t rc = 0;
 272
 273         path = ibmebus_chomp(buf, count);
 274         if (!path)
 275                 return -ENOMEM;
 276
 277         dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 278                               ibmebus_match_path);
 279         if (dev) {
 280                 put_device(dev);
 281                 printk(KERN_WARNING "%s: %s has already been probed\n",
 282                        __func__, path);
 283                 rc = -EEXIST;
 284                 goto out;
 285         }
 286
 287         if ((dn = of_find_node_by_path(path))) {
 288                 rc = ibmebus_create_device(dn);
 289                 of_node_put(dn);
 290         } else {
 291                 printk(KERN_WARNING "%s: no such device node: %s\n",
 292                        __func__, path);
 293                 rc = -ENODEV;
 294         }
 295
 296 out:
 297         kfree(path);
 298         if (rc)
 299                 return rc;
 300         return count;
 301 }
 302 static BUS_ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe);
 303
 304 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 305                                     const char *buf, size_t count)
 306 {
 307         struct device *dev;
 308         char *path;
 309
 310         path = ibmebus_chomp(buf, count);
 311         if (!path)
 312                 return -ENOMEM;
 313
 314         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 315                                    ibmebus_match_path))) {
 316                 of_device_unregister(to_platform_device(dev));
 317                 put_device(dev);
 318
 319                 kfree(path);
 320                 return count;
 321         } else {
 322                 printk(KERN_WARNING "%s: %s not on the bus\n",
 323                        __func__, path);
 324
 325                 kfree(path);
 326                 return -ENODEV;
 327         }
 328 }
 329 static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove);
 330
 331 static struct attribute *ibmbus_bus_attrs[] = {
 332         &bus_attr_probe.attr,
 333         &bus_attr_remove.attr,
 334         NULL,
 335 };
 336 ATTRIBUTE_GROUPS(ibmbus_bus);
 337
 338 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
 339 {
 340         const struct of_device_id *matches = drv->of_match_table;
 341
 342         if (!matches)
 343                 return 0;
 344
 345         return of_match_device(matches, dev) != NULL;
 346 }
 347
 348 static int ibmebus_bus_device_probe(struct device *dev)
 349 {
 350         int error = -ENODEV;
 351         struct platform_driver *drv;
 352         struct platform_device *of_dev;
 353
 354         drv = to_platform_driver(dev->driver);
 355         of_dev = to_platform_device(dev);
 356
 357         if (!drv->probe)
 358                 return error;
 359
 360         of_dev_get(of_dev);
 361
 362         if (of_driver_match_device(dev, dev->driver))
 363                 error = drv->probe(of_dev);
 364         if (error)
 365                 of_dev_put(of_dev);
 366
 367         return error;
 368 }
 369
 370 static int ibmebus_bus_device_remove(struct device *dev)
 371 {
 372         struct platform_device *of_dev = to_platform_device(dev);
 373         struct platform_driver *drv = to_platform_driver(dev->driver);
 374
 375         if (dev->driver && drv->remove)
 376                 drv->remove(of_dev);
 377         return 0;
 378 }
 379
 380 static void ibmebus_bus_device_shutdown(struct device *dev)
 381 {
 382         struct platform_device *of_dev = to_platform_device(dev);
 383         struct platform_driver *drv = to_platform_driver(dev->driver);
 384
 385         if (dev->driver && drv->shutdown)
 386                 drv->shutdown(of_dev);
 387 }
 388
 389 /*
 390  * ibmebus_bus_device_attrs
 391  */
 392 static ssize_t devspec_show(struct device *dev,
 393                                 struct device_attribute *attr, char *buf)
 394 {
 395         struct platform_device *ofdev;
 396
 397         ofdev = to_platform_device(dev);
 398         return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
 399 }
 400
 401 static ssize_t name_show(struct device *dev,
 402                                 struct device_attribute *attr, char *buf)
 403 {
 404         struct platform_device *ofdev;
 405
 406         ofdev = to_platform_device(dev);
 407         return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
 408 }
 409
 410 static ssize_t modalias_show(struct device *dev,
 411                                 struct device_attribute *attr, char *buf)
 412 {
 413         ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
 414         buf[len] = '\n';
 415         buf[len+1] = 0;
 416         return len+1;
 417 }
 418
 419 struct device_attribute ibmebus_bus_device_attrs[] = {
 420         __ATTR_RO(devspec),
 421         __ATTR_RO(name),
 422         __ATTR_RO(modalias),
 423         __ATTR_NULL
 424 };
 425
 426 #ifdef CONFIG_PM_SLEEP
 427 static int ibmebus_bus_legacy_suspend(struct device *dev, pm_message_t mesg)
 428 {
 429         struct platform_device *of_dev = to_platform_device(dev);
 430         struct platform_driver *drv = to_platform_driver(dev->driver);
 431         int ret = 0;
 432
 433         if (dev->driver && drv->suspend)
 434                 ret = drv->suspend(of_dev, mesg);
 435         return ret;
 436 }
 437
 438 static int ibmebus_bus_legacy_resume(struct device *dev)
 439 {
 440         struct platform_device *of_dev = to_platform_device(dev);
 441         struct platform_driver *drv = to_platform_driver(dev->driver);
 442         int ret = 0;
 443
 444         if (dev->driver && drv->resume)
 445                 ret = drv->resume(of_dev);
 446         return ret;
 447 }
 448
 449 static int ibmebus_bus_pm_prepare(struct device *dev)
 450 {
 451         struct device_driver *drv = dev->driver;
 452         int ret = 0;
 453
 454         if (drv && drv->pm && drv->pm->prepare)
 455                 ret = drv->pm->prepare(dev);
 456
 457         return ret;
 458 }
 459
 460 static void ibmebus_bus_pm_complete(struct device *dev)
 461 {
 462         struct device_driver *drv = dev->driver;
 463
 464         if (drv && drv->pm && drv->pm->complete)
 465                 drv->pm->complete(dev);
 466 }
 467
 468 #ifdef CONFIG_SUSPEND
 469
 470 static int ibmebus_bus_pm_suspend(struct device *dev)
 471 {
 472         struct device_driver *drv = dev->driver;
 473         int ret = 0;
 474
 475         if (!drv)
 476                 return 0;
 477
 478         if (drv->pm) {
 479                 if (drv->pm->suspend)
 480                         ret = drv->pm->suspend(dev);
 481         } else {
 482                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_SUSPEND);
 483         }
 484
 485         return ret;
 486 }
 487
 488 static int ibmebus_bus_pm_suspend_noirq(struct device *dev)
 489 {
 490         struct device_driver *drv = dev->driver;
 491         int ret = 0;
 492
 493         if (!drv)
 494                 return 0;
 495
 496         if (drv->pm) {
 497                 if (drv->pm->suspend_noirq)
 498                         ret = drv->pm->suspend_noirq(dev);
 499         }
 500
 501         return ret;
 502 }
 503
 504 static int ibmebus_bus_pm_resume(struct device *dev)
 505 {
 506         struct device_driver *drv = dev->driver;
 507         int ret = 0;
 508
 509         if (!drv)
 510                 return 0;
 511
 512         if (drv->pm) {
 513                 if (drv->pm->resume)
 514                         ret = drv->pm->resume(dev);
 515         } else {
 516                 ret = ibmebus_bus_legacy_resume(dev);
 517         }
 518
 519         return ret;
 520 }
 521
 522 static int ibmebus_bus_pm_resume_noirq(struct device *dev)
 523 {
 524         struct device_driver *drv = dev->driver;
 525         int ret = 0;
 526
 527         if (!drv)
 528                 return 0;
 529
 530         if (drv->pm) {
 531                 if (drv->pm->resume_noirq)
 532                         ret = drv->pm->resume_noirq(dev);
 533         }
 534
 535         return ret;
 536 }
 537
 538 #else /* !CONFIG_SUSPEND */
 539
 540 #define ibmebus_bus_pm_suspend          NULL
 541 #define ibmebus_bus_pm_resume           NULL
 542 #define ibmebus_bus_pm_suspend_noirq    NULL
 543 #define ibmebus_bus_pm_resume_noirq     NULL
 544
 545 #endif /* !CONFIG_SUSPEND */
 546
 547 #ifdef CONFIG_HIBERNATE_CALLBACKS
 548
 549 static int ibmebus_bus_pm_freeze(struct device *dev)
 550 {
 551         struct device_driver *drv = dev->driver;
 552         int ret = 0;
 553
 554         if (!drv)
 555                 return 0;
 556
 557         if (drv->pm) {
 558                 if (drv->pm->freeze)
 559                         ret = drv->pm->freeze(dev);
 560         } else {
 561                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_FREEZE);
 562         }
 563
 564         return ret;
 565 }
 566
 567 static int ibmebus_bus_pm_freeze_noirq(struct device *dev)
 568 {
 569         struct device_driver *drv = dev->driver;
 570         int ret = 0;
 571
 572         if (!drv)
 573                 return 0;
 574
 575         if (drv->pm) {
 576                 if (drv->pm->freeze_noirq)
 577                         ret = drv->pm->freeze_noirq(dev);
 578         }
 579
 580         return ret;
 581 }
 582
 583 static int ibmebus_bus_pm_thaw(struct device *dev)
 584 {
 585         struct device_driver *drv = dev->driver;
 586         int ret = 0;
 587
 588         if (!drv)
 589                 return 0;
 590
 591         if (drv->pm) {
 592                 if (drv->pm->thaw)
 593                         ret = drv->pm->thaw(dev);
 594         } else {
 595                 ret = ibmebus_bus_legacy_resume(dev);
 596         }
 597
 598         return ret;
 599 }
 600
 601 static int ibmebus_bus_pm_thaw_noirq(struct device *dev)
 602 {
 603         struct device_driver *drv = dev->driver;
 604         int ret = 0;
 605
 606         if (!drv)
 607                 return 0;
 608
 609         if (drv->pm) {
 610                 if (drv->pm->thaw_noirq)
 611                         ret = drv->pm->thaw_noirq(dev);
 612         }
 613
 614         return ret;
 615 }
 616
 617 static int ibmebus_bus_pm_poweroff(struct device *dev)
 618 {
 619         struct device_driver *drv = dev->driver;
 620         int ret = 0;
 621
 622         if (!drv)
 623                 return 0;
 624
 625         if (drv->pm) {
 626                 if (drv->pm->poweroff)
 627                         ret = drv->pm->poweroff(dev);
 628         } else {
 629                 ret = ibmebus_bus_legacy_suspend(dev, PMSG_HIBERNATE);
 630         }
 631
 632         return ret;
 633 }
 634
 635 static int ibmebus_bus_pm_poweroff_noirq(struct device *dev)
 636 {
 637         struct device_driver *drv = dev->driver;
 638         int ret = 0;
 639
 640         if (!drv)
 641                 return 0;
 642
 643         if (drv->pm) {
 644                 if (drv->pm->poweroff_noirq)
 645                         ret = drv->pm->poweroff_noirq(dev);
 646         }
 647
 648         return ret;
 649 }
 650
 651 static int ibmebus_bus_pm_restore(struct device *dev)
 652 {
 653         struct device_driver *drv = dev->driver;
 654         int ret = 0;
 655
 656         if (!drv)
 657                 return 0;
 658
 659         if (drv->pm) {
 660                 if (drv->pm->restore)
 661                         ret = drv->pm->restore(dev);
 662         } else {
 663                 ret = ibmebus_bus_legacy_resume(dev);
 664         }
 665
 666         return ret;
 667 }
 668
 669 static int ibmebus_bus_pm_restore_noirq(struct device *dev)
 670 {
 671         struct device_driver *drv = dev->driver;
 672         int ret = 0;
 673
 674         if (!drv)
 675                 return 0;
 676
 677         if (drv->pm) {
 678                 if (drv->pm->restore_noirq)
 679                         ret = drv->pm->restore_noirq(dev);
 680         }
 681
 682         return ret;
 683 }
 684
 685 #else /* !CONFIG_HIBERNATE_CALLBACKS */
 686
 687 #define ibmebus_bus_pm_freeze           NULL
 688 #define ibmebus_bus_pm_thaw             NULL
 689 #define ibmebus_bus_pm_poweroff         NULL
 690 #define ibmebus_bus_pm_restore          NULL
 691 #define ibmebus_bus_pm_freeze_noirq     NULL
 692 #define ibmebus_bus_pm_thaw_noirq               NULL
 693 #define ibmebus_bus_pm_poweroff_noirq   NULL
 694 #define ibmebus_bus_pm_restore_noirq    NULL
 695
 696 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
 697
 698 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
 699         .prepare = ibmebus_bus_pm_prepare,
 700         .complete = ibmebus_bus_pm_complete,
 701         .suspend = ibmebus_bus_pm_suspend,
 702         .resume = ibmebus_bus_pm_resume,
 703         .freeze = ibmebus_bus_pm_freeze,
 704         .thaw = ibmebus_bus_pm_thaw,
 705         .poweroff = ibmebus_bus_pm_poweroff,
 706         .restore = ibmebus_bus_pm_restore,
 707         .suspend_noirq = ibmebus_bus_pm_suspend_noirq,
 708         .resume_noirq = ibmebus_bus_pm_resume_noirq,
 709         .freeze_noirq = ibmebus_bus_pm_freeze_noirq,
 710         .thaw_noirq = ibmebus_bus_pm_thaw_noirq,
 711         .poweroff_noirq = ibmebus_bus_pm_poweroff_noirq,
 712         .restore_noirq = ibmebus_bus_pm_restore_noirq,
 713 };
 714
 715 #define IBMEBUS_BUS_PM_OPS_PTR  (&ibmebus_bus_dev_pm_ops)
 716
 717 #else /* !CONFIG_PM_SLEEP */
 718
 719 #define IBMEBUS_BUS_PM_OPS_PTR  NULL
 720
 721 #endif /* !CONFIG_PM_SLEEP */
 722
 723 struct bus_type ibmebus_bus_type = {
 724         .name      = "ibmebus",
 725         .uevent    = of_device_uevent_modalias,
 726         .bus_groups = ibmbus_bus_groups,
 727         .match     = ibmebus_bus_bus_match,
 728         .probe     = ibmebus_bus_device_probe,
 729         .remove    = ibmebus_bus_device_remove,
 730         .shutdown  = ibmebus_bus_device_shutdown,
 731         .dev_attrs = ibmebus_bus_device_attrs,
 732         .pm        = IBMEBUS_BUS_PM_OPS_PTR,
 733 };
 734 EXPORT_SYMBOL(ibmebus_bus_type);
 735
 736 static int __init ibmebus_bus_init(void)
 737 {
 738         int err;
 739
 740         printk(KERN_INFO "IBM eBus Device Driver\n");
 741
 742         err = bus_register(&ibmebus_bus_type);
 743         if (err) {
 744                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
 745                        __func__);
 746                 return err;
 747         }
 748
 749         err = device_register(&ibmebus_bus_device);
 750         if (err) {
 751                 printk(KERN_WARNING "%s: device_register returned %i\n",
 752                        __func__, err);
 753                 bus_unregister(&ibmebus_bus_type);
 754
 755                 return err;
 756         }
 757
 758         err = ibmebus_create_devices(ibmebus_matches);
 759         if (err) {
 760                 device_unregister(&ibmebus_bus_device);
 761                 bus_unregister(&ibmebus_bus_type);
 762                 return err;
 763         }
 764
 765         return 0;
 766 }
 767 postcore_initcall(ibmebus_bus_init);