drivers/pci/hotplug/cpci_hotplug_core.c

   1 /*
   2  * CompactPCI Hot Plug Driver
   3  *
   4  * Copyright (C) 2002,2005 SOMA Networks, Inc.
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <scottm@somanetworks.com>
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/pci.h>
  32 #include <linux/pci_hotplug.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/atomic.h>
  36 #include <linux/delay.h>
  37 #include <linux/kthread.h>
  38 #include "cpci_hotplug.h"
  39
  40 #define DRIVER_AUTHOR   "Scott Murray <scottm@somanetworks.com>"
  41 #define DRIVER_DESC     "CompactPCI Hot Plug Core"
  42
  43 #define MY_NAME "cpci_hotplug"
  44
  45 #define dbg(format, arg...)                                     \
  46         do {                                                    \
  47                 if (cpci_debug)                                 \
  48                         printk (KERN_DEBUG "%s: " format "\n",  \
  49                                 MY_NAME , ## arg);              \
  50         } while (0)
  51 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
  52 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
  53 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
  54
  55 /* local variables */
  56 static DECLARE_RWSEM(list_rwsem);
  57 static LIST_HEAD(slot_list);
  58 static int slots;
  59 static atomic_t extracting;
  60 int cpci_debug;
  61 static struct cpci_hp_controller *controller;
  62 static struct task_struct *cpci_thread;
  63 static int thread_finished;
  64
  65 static int enable_slot(struct hotplug_slot *slot);
  66 static int disable_slot(struct hotplug_slot *slot);
  67 static int set_attention_status(struct hotplug_slot *slot, u8 value);
  68 static int get_power_status(struct hotplug_slot *slot, u8 * value);
  69 static int get_attention_status(struct hotplug_slot *slot, u8 * value);
  70 static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
  71 static int get_latch_status(struct hotplug_slot *slot, u8 * value);
  72
  73 static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
  74         .enable_slot = enable_slot,
  75         .disable_slot = disable_slot,
  76         .set_attention_status = set_attention_status,
  77         .get_power_status = get_power_status,
  78         .get_attention_status = get_attention_status,
  79         .get_adapter_status = get_adapter_status,
  80         .get_latch_status = get_latch_status,
  81 };
  82
  83 static int
  84 update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
  85 {
  86         struct hotplug_slot_info info;
  87
  88         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  89         info.latch_status = value;
  90         return pci_hp_change_slot_info(hotplug_slot, &info);
  91 }
  92
  93 static int
  94 update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
  95 {
  96         struct hotplug_slot_info info;
  97
  98         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  99         info.adapter_status = value;
 100         return pci_hp_change_slot_info(hotplug_slot, &info);
 101 }
 102
 103 static int
 104 enable_slot(struct hotplug_slot *hotplug_slot)
 105 {
 106         struct slot *slot = hotplug_slot->private;
 107         int retval = 0;
 108
 109         dbg("%s - physical_slot = %s", __func__, slot_name(slot));
 110
 111         if (controller->ops->set_power)
 112                 retval = controller->ops->set_power(slot, 1);
 113         return retval;
 114 }
 115
 116 static int
 117 disable_slot(struct hotplug_slot *hotplug_slot)
 118 {
 119         struct slot *slot = hotplug_slot->private;
 120         int retval = 0;
 121
 122         dbg("%s - physical_slot = %s", __func__, slot_name(slot));
 123
 124         down_write(&list_rwsem);
 125
 126         /* Unconfigure device */
 127         dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));
 128         if ((retval = cpci_unconfigure_slot(slot))) {
 129                 err("%s - could not unconfigure slot %s",
 130                     __func__, slot_name(slot));
 131                 goto disable_error;
 132         }
 133         dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot));
 134
 135         /* Clear EXT (by setting it) */
 136         if (cpci_clear_ext(slot)) {
 137                 err("%s - could not clear EXT for slot %s",
 138                     __func__, slot_name(slot));
 139                 retval = -ENODEV;
 140                 goto disable_error;
 141         }
 142         cpci_led_on(slot);
 143
 144         if (controller->ops->set_power)
 145                 if ((retval = controller->ops->set_power(slot, 0)))
 146                         goto disable_error;
 147
 148         if (update_adapter_status(slot->hotplug_slot, 0))
 149                 warn("failure to update adapter file");
 150
 151         if (slot->extracting) {
 152                 slot->extracting = 0;
 153                 atomic_dec(&extracting);
 154         }
 155 disable_error:
 156         up_write(&list_rwsem);
 157         return retval;
 158 }
 159
 160 static u8
 161 cpci_get_power_status(struct slot *slot)
 162 {
 163         u8 power = 1;
 164
 165         if (controller->ops->get_power)
 166                 power = controller->ops->get_power(slot);
 167         return power;
 168 }
 169
 170 static int
 171 get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 172 {
 173         struct slot *slot = hotplug_slot->private;
 174
 175         *value = cpci_get_power_status(slot);
 176         return 0;
 177 }
 178
 179 static int
 180 get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 181 {
 182         struct slot *slot = hotplug_slot->private;
 183
 184         *value = cpci_get_attention_status(slot);
 185         return 0;
 186 }
 187
 188 static int
 189 set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 190 {
 191         return cpci_set_attention_status(hotplug_slot->private, status);
 192 }
 193
 194 static int
 195 get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 196 {
 197         *value = hotplug_slot->info->adapter_status;
 198         return 0;
 199 }
 200
 201 static int
 202 get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value)
 203 {
 204         *value = hotplug_slot->info->latch_status;
 205         return 0;
 206 }
 207
 208 static void release_slot(struct hotplug_slot *hotplug_slot)
 209 {
 210         struct slot *slot = hotplug_slot->private;
 211
 212         kfree(slot->hotplug_slot->info);
 213         kfree(slot->hotplug_slot);
 214         if (slot->dev)
 215                 pci_dev_put(slot->dev);
 216         kfree(slot);
 217 }
 218
 219 #define SLOT_NAME_SIZE  6
 220
 221 int
 222 cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
 223 {
 224         struct slot *slot;
 225         struct hotplug_slot *hotplug_slot;
 226         struct hotplug_slot_info *info;
 227         char name[SLOT_NAME_SIZE];
 228         int status;
 229         int i;
 230
 231         if (!(controller && bus))
 232                 return -ENODEV;
 233
 234         /*
 235          * Create a structure for each slot, and register that slot
 236          * with the pci_hotplug subsystem.
 237          */
 238         for (i = first; i <= last; ++i) {
 239                 slot = kzalloc(sizeof (struct slot), GFP_KERNEL);
 240                 if (!slot) {
 241                         status = -ENOMEM;
 242                         goto error;
 243                 }
 244
 245                 hotplug_slot =
 246                         kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
 247                 if (!hotplug_slot) {
 248                         status = -ENOMEM;
 249                         goto error_slot;
 250                 }
 251                 slot->hotplug_slot = hotplug_slot;
 252
 253                 info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
 254                 if (!info) {
 255                         status = -ENOMEM;
 256                         goto error_hpslot;
 257                 }
 258                 hotplug_slot->info = info;
 259
 260                 slot->bus = bus;
 261                 slot->number = i;
 262                 slot->devfn = PCI_DEVFN(i, 0);
 263
 264                 snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i);
 265
 266                 hotplug_slot->private = slot;
 267                 hotplug_slot->release = &release_slot;
 268                 hotplug_slot->ops = &cpci_hotplug_slot_ops;
 269
 270                 /*
 271                  * Initialize the slot info structure with some known
 272                  * good values.
 273                  */
 274                 dbg("initializing slot %s", name);
 275                 info->power_status = cpci_get_power_status(slot);
 276                 info->attention_status = cpci_get_attention_status(slot);
 277
 278                 dbg("registering slot %s", name);
 279                 status = pci_hp_register(slot->hotplug_slot, bus, i, name);
 280                 if (status) {
 281                         err("pci_hp_register failed with error %d", status);
 282                         goto error_info;
 283                 }
 284                 dbg("slot registered with name: %s", slot_name(slot));
 285
 286                 /* Add slot to our internal list */
 287                 down_write(&list_rwsem);
 288                 list_add(&slot->slot_list, &slot_list);
 289                 slots++;
 290                 up_write(&list_rwsem);
 291         }
 292         return 0;
 293 error_info:
 294         kfree(info);
 295 error_hpslot:
 296         kfree(hotplug_slot);
 297 error_slot:
 298         kfree(slot);
 299 error:
 300         return status;
 301 }
 302
 303 int
 304 cpci_hp_unregister_bus(struct pci_bus *bus)
 305 {
 306         struct slot *slot;
 307         struct slot *tmp;
 308         int status = 0;
 309
 310         down_write(&list_rwsem);
 311         if (!slots) {
 312                 up_write(&list_rwsem);
 313                 return -1;
 314         }
 315         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
 316                 if (slot->bus == bus) {
 317                         list_del(&slot->slot_list);
 318                         slots--;
 319
 320                         dbg("deregistering slot %s", slot_name(slot));
 321                         status = pci_hp_deregister(slot->hotplug_slot);
 322                         if (status) {
 323                                 err("pci_hp_deregister failed with error %d",
 324                                     status);
 325                                 break;
 326                         }
 327                 }
 328         }
 329         up_write(&list_rwsem);
 330         return status;
 331 }
 332
 333 /* This is the interrupt mode interrupt handler */
 334 static irqreturn_t
 335 cpci_hp_intr(int irq, void *data)
 336 {
 337         dbg("entered cpci_hp_intr");
 338
 339         /* Check to see if it was our interrupt */
 340         if ((controller->irq_flags & IRQF_SHARED) &&
 341             !controller->ops->check_irq(controller->dev_id)) {
 342                 dbg("exited cpci_hp_intr, not our interrupt");
 343                 return IRQ_NONE;
 344         }
 345
 346         /* Disable ENUM interrupt */
 347         controller->ops->disable_irq();
 348
 349         /* Trigger processing by the event thread */
 350         wake_up_process(cpci_thread);
 351         return IRQ_HANDLED;
 352 }
 353
 354 /*
 355  * According to PICMG 2.1 R2.0, section 6.3.2, upon
 356  * initialization, the system driver shall clear the
 357  * INS bits of the cold-inserted devices.
 358  */
 359 static int
 360 init_slots(int clear_ins)
 361 {
 362         struct slot *slot;
 363         struct pci_dev* dev;
 364
 365         dbg("%s - enter", __func__);
 366         down_read(&list_rwsem);
 367         if (!slots) {
 368                 up_read(&list_rwsem);
 369                 return -1;
 370         }
 371         list_for_each_entry(slot, &slot_list, slot_list) {
 372                 dbg("%s - looking at slot %s", __func__, slot_name(slot));
 373                 if (clear_ins && cpci_check_and_clear_ins(slot))
 374                         dbg("%s - cleared INS for slot %s",
 375                             __func__, slot_name(slot));
 376                 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
 377                 if (dev) {
 378                         if (update_adapter_status(slot->hotplug_slot, 1))
 379                                 warn("failure to update adapter file");
 380                         if (update_latch_status(slot->hotplug_slot, 1))
 381                                 warn("failure to update latch file");
 382                         slot->dev = dev;
 383                 }
 384         }
 385         up_read(&list_rwsem);
 386         dbg("%s - exit", __func__);
 387         return 0;
 388 }
 389
 390 static int
 391 check_slots(void)
 392 {
 393         struct slot *slot;
 394         int extracted;
 395         int inserted;
 396         u16 hs_csr;
 397
 398         down_read(&list_rwsem);
 399         if (!slots) {
 400                 up_read(&list_rwsem);
 401                 err("no slots registered, shutting down");
 402                 return -1;
 403         }
 404         extracted = inserted = 0;
 405         list_for_each_entry(slot, &slot_list, slot_list) {
 406                 dbg("%s - looking at slot %s", __func__, slot_name(slot));
 407                 if (cpci_check_and_clear_ins(slot)) {
 408                         /*
 409                          * Some broken hardware (e.g. PLX 9054AB) asserts
 410                          * ENUM# twice...
 411                          */
 412                         if (slot->dev) {
 413                                 warn("slot %s already inserted",
 414                                      slot_name(slot));
 415                                 inserted++;
 416                                 continue;
 417                         }
 418
 419                         /* Process insertion */
 420                         dbg("%s - slot %s inserted", __func__, slot_name(slot));
 421
 422                         /* GSM, debug */
 423                         hs_csr = cpci_get_hs_csr(slot);
 424                         dbg("%s - slot %s HS_CSR (1) = %04x",
 425                             __func__, slot_name(slot), hs_csr);
 426
 427                         /* Configure device */
 428                         dbg("%s - configuring slot %s",
 429                             __func__, slot_name(slot));
 430                         if (cpci_configure_slot(slot)) {
 431                                 err("%s - could not configure slot %s",
 432                                     __func__, slot_name(slot));
 433                                 continue;
 434                         }
 435                         dbg("%s - finished configuring slot %s",
 436                             __func__, slot_name(slot));
 437
 438                         /* GSM, debug */
 439                         hs_csr = cpci_get_hs_csr(slot);
 440                         dbg("%s - slot %s HS_CSR (2) = %04x",
 441                             __func__, slot_name(slot), hs_csr);
 442
 443                         if (update_latch_status(slot->hotplug_slot, 1))
 444                                 warn("failure to update latch file");
 445
 446                         if (update_adapter_status(slot->hotplug_slot, 1))
 447                                 warn("failure to update adapter file");
 448
 449                         cpci_led_off(slot);
 450
 451                         /* GSM, debug */
 452                         hs_csr = cpci_get_hs_csr(slot);
 453                         dbg("%s - slot %s HS_CSR (3) = %04x",
 454                             __func__, slot_name(slot), hs_csr);
 455
 456                         inserted++;
 457                 } else if (cpci_check_ext(slot)) {
 458                         /* Process extraction request */
 459                         dbg("%s - slot %s extracted",
 460                             __func__, slot_name(slot));
 461
 462                         /* GSM, debug */
 463                         hs_csr = cpci_get_hs_csr(slot);
 464                         dbg("%s - slot %s HS_CSR = %04x",
 465                             __func__, slot_name(slot), hs_csr);
 466
 467                         if (!slot->extracting) {
 468                                 if (update_latch_status(slot->hotplug_slot, 0)) {
 469                                         warn("failure to update latch file");
 470                                 }
 471                                 slot->extracting = 1;
 472                                 atomic_inc(&extracting);
 473                         }
 474                         extracted++;
 475                 } else if (slot->extracting) {
 476                         hs_csr = cpci_get_hs_csr(slot);
 477                         if (hs_csr == 0xffff) {
 478                                 /*
 479                                  * Hmmm, we're likely hosed at this point, should we
 480                                  * bother trying to tell the driver or not?
 481                                  */
 482                                 err("card in slot %s was improperly removed",
 483                                     slot_name(slot));
 484                                 if (update_adapter_status(slot->hotplug_slot, 0))
 485                                         warn("failure to update adapter file");
 486                                 slot->extracting = 0;
 487                                 atomic_dec(&extracting);
 488                         }
 489                 }
 490         }
 491         up_read(&list_rwsem);
 492         dbg("inserted=%d, extracted=%d, extracting=%d",
 493             inserted, extracted, atomic_read(&extracting));
 494         if (inserted || extracted)
 495                 return extracted;
 496         else if (!atomic_read(&extracting)) {
 497                 err("cannot find ENUM# source, shutting down");
 498                 return -1;
 499         }
 500         return 0;
 501 }
 502
 503 /* This is the interrupt mode worker thread body */
 504 static int
 505 event_thread(void *data)
 506 {
 507         int rc;
 508
 509         dbg("%s - event thread started", __func__);
 510         while (1) {
 511                 dbg("event thread sleeping");
 512                 set_current_state(TASK_INTERRUPTIBLE);
 513                 schedule();
 514                 if (kthread_should_stop())
 515                         break;
 516                 do {
 517                         rc = check_slots();
 518                         if (rc > 0) {
 519                                 /* Give userspace a chance to handle extraction */
 520                                 msleep(500);
 521                         } else if (rc < 0) {
 522                                 dbg("%s - error checking slots", __func__);
 523                                 thread_finished = 1;
 524                                 goto out;
 525                         }
 526                 } while (atomic_read(&extracting) && !kthread_should_stop());
 527                 if (kthread_should_stop())
 528                         break;
 529
 530                 /* Re-enable ENUM# interrupt */
 531                 dbg("%s - re-enabling irq", __func__);
 532                 controller->ops->enable_irq();
 533         }
 534  out:
 535         return 0;
 536 }
 537
 538 /* This is the polling mode worker thread body */
 539 static int
 540 poll_thread(void *data)
 541 {
 542         int rc;
 543
 544         while (1) {
 545                 if (kthread_should_stop() || signal_pending(current))
 546                         break;
 547                 if (controller->ops->query_enum()) {
 548                         do {
 549                                 rc = check_slots();
 550                                 if (rc > 0) {
 551                                         /* Give userspace a chance to handle extraction */
 552                                         msleep(500);
 553                                 } else if (rc < 0) {
 554                                         dbg("%s - error checking slots", __func__);
 555                                         thread_finished = 1;
 556                                         goto out;
 557                                 }
 558                         } while (atomic_read(&extracting) && !kthread_should_stop());
 559                 }
 560                 msleep(100);
 561         }
 562  out:
 563         return 0;
 564 }
 565
 566 static int
 567 cpci_start_thread(void)
 568 {
 569         if (controller->irq)
 570                 cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
 571         else
 572                 cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
 573         if (IS_ERR(cpci_thread)) {
 574                 err("Can't start up our thread");
 575                 return PTR_ERR(cpci_thread);
 576         }
 577         thread_finished = 0;
 578         return 0;
 579 }
 580
 581 static void
 582 cpci_stop_thread(void)
 583 {
 584         kthread_stop(cpci_thread);
 585         thread_finished = 1;
 586 }
 587
 588 int
 589 cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
 590 {
 591         int status = 0;
 592
 593         if (controller)
 594                 return -1;
 595         if (!(new_controller && new_controller->ops))
 596                 return -EINVAL;
 597         if (new_controller->irq) {
 598                 if (!(new_controller->ops->enable_irq &&
 599                      new_controller->ops->disable_irq))
 600                         status = -EINVAL;
 601                 if (request_irq(new_controller->irq,
 602                                cpci_hp_intr,
 603                                new_controller->irq_flags,
 604                                MY_NAME,
 605                                new_controller->dev_id)) {
 606                         err("Can't get irq %d for the hotplug cPCI controller",
 607                             new_controller->irq);
 608                         status = -ENODEV;
 609                 }
 610                 dbg("%s - acquired controller irq %d",
 611                     __func__, new_controller->irq);
 612         }
 613         if (!status)
 614                 controller = new_controller;
 615         return status;
 616 }
 617
 618 static void
 619 cleanup_slots(void)
 620 {
 621         struct slot *slot;
 622         struct slot *tmp;
 623
 624         /*
 625          * Unregister all of our slots with the pci_hotplug subsystem,
 626          * and free up all memory that we had allocated.
 627          */
 628         down_write(&list_rwsem);
 629         if (!slots)
 630                 goto cleanup_null;
 631         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
 632                 list_del(&slot->slot_list);
 633                 pci_hp_deregister(slot->hotplug_slot);
 634         }
 635 cleanup_null:
 636         up_write(&list_rwsem);
 637         return;
 638 }
 639
 640 int
 641 cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
 642 {
 643         int status = 0;
 644
 645         if (controller) {
 646                 if (!thread_finished)
 647                         cpci_stop_thread();
 648                 if (controller->irq)
 649                         free_irq(controller->irq, controller->dev_id);
 650                 controller = NULL;
 651                 cleanup_slots();
 652         } else
 653                 status = -ENODEV;
 654         return status;
 655 }
 656
 657 int
 658 cpci_hp_start(void)
 659 {
 660         static int first = 1;
 661         int status;
 662
 663         dbg("%s - enter", __func__);
 664         if (!controller)
 665                 return -ENODEV;
 666
 667         down_read(&list_rwsem);
 668         if (list_empty(&slot_list)) {
 669                 up_read(&list_rwsem);
 670                 return -ENODEV;
 671         }
 672         up_read(&list_rwsem);
 673
 674         status = init_slots(first);
 675         if (first)
 676                 first = 0;
 677         if (status)
 678                 return status;
 679
 680         status = cpci_start_thread();
 681         if (status)
 682                 return status;
 683         dbg("%s - thread started", __func__);
 684
 685         if (controller->irq) {
 686                 /* Start enum interrupt processing */
 687                 dbg("%s - enabling irq", __func__);
 688                 controller->ops->enable_irq();
 689         }
 690         dbg("%s - exit", __func__);
 691         return 0;
 692 }
 693
 694 int
 695 cpci_hp_stop(void)
 696 {
 697         if (!controller)
 698                 return -ENODEV;
 699         if (controller->irq) {
 700                 /* Stop enum interrupt processing */
 701                 dbg("%s - disabling irq", __func__);
 702                 controller->ops->disable_irq();
 703         }
 704         cpci_stop_thread();
 705         return 0;
 706 }
 707
 708 int __init
 709 cpci_hotplug_init(int debug)
 710 {
 711         cpci_debug = debug;
 712         return 0;
 713 }
 714
 715 void __exit
 716 cpci_hotplug_exit(void)
 717 {
 718         /*
 719          * Clean everything up.
 720          */
 721         cpci_hp_stop();
 722         cpci_hp_unregister_controller(controller);
 723 }
 724
 725 EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
 726 EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
 727 EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
 728 EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
 729 EXPORT_SYMBOL_GPL(cpci_hp_start);
 730 EXPORT_SYMBOL_GPL(cpci_hp_stop);