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/config.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/slab.h>
  32 #include <linux/pci.h>
  33 #include <linux/init.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/smp_lock.h>
  36 #include <asm/atomic.h>
  37 #include <linux/delay.h>
  38 #include "pci_hotplug.h"
  39 #include "cpci_hotplug.h"
  40
  41 #define DRIVER_AUTHOR   "Scott Murray <scottm@somanetworks.com>"
  42 #define DRIVER_DESC     "CompactPCI Hot Plug Core"
  43
  44 #define MY_NAME "cpci_hotplug"
  45
  46 #define dbg(format, arg...)                                     \
  47         do {                                                    \
  48                 if (cpci_debug)                                 \
  49                         printk (KERN_DEBUG "%s: " format "\n",  \
  50                                 MY_NAME , ## arg);              \
  51         } while (0)
  52 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
  53 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
  54 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
  55
  56 /* local variables */
  57 static DECLARE_RWSEM(list_rwsem);
  58 static LIST_HEAD(slot_list);
  59 static int slots;
  60 static atomic_t extracting;
  61 int cpci_debug;
  62 static struct cpci_hp_controller *controller;
  63 static struct semaphore event_semaphore;        /* mutex for process loop (up if something to process) */
  64 static struct semaphore thread_exit;            /* guard ensure thread has exited before calling it quits */
  65 static int thread_finished = 1;
  66
  67 static int enable_slot(struct hotplug_slot *slot);
  68 static int disable_slot(struct hotplug_slot *slot);
  69 static int set_attention_status(struct hotplug_slot *slot, u8 value);
  70 static int get_power_status(struct hotplug_slot *slot, u8 * value);
  71 static int get_attention_status(struct hotplug_slot *slot, u8 * value);
  72 static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
  73 static int get_latch_status(struct hotplug_slot *slot, u8 * value);
  74
  75 static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
  76         .owner = THIS_MODULE,
  77         .enable_slot = enable_slot,
  78         .disable_slot = disable_slot,
  79         .set_attention_status = set_attention_status,
  80         .get_power_status = get_power_status,
  81         .get_attention_status = get_attention_status,
  82         .get_adapter_status = get_adapter_status,
  83         .get_latch_status = get_latch_status,
  84 };
  85
  86 static int
  87 update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
  88 {
  89         struct hotplug_slot_info info;
  90
  91         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
  92         info.latch_status = value;
  93         return pci_hp_change_slot_info(hotplug_slot, &info);
  94 }
  95
  96 static int
  97 update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
  98 {
  99         struct hotplug_slot_info info;
 100
 101         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
 102         info.adapter_status = value;
 103         return pci_hp_change_slot_info(hotplug_slot, &info);
 104 }
 105
 106 static int
 107 enable_slot(struct hotplug_slot *hotplug_slot)
 108 {
 109         struct slot *slot = hotplug_slot->private;
 110         int retval = 0;
 111
 112         dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
 113
 114         if (controller->ops->set_power)
 115                 retval = controller->ops->set_power(slot, 1);
 116         return retval;
 117 }
 118
 119 static int
 120 disable_slot(struct hotplug_slot *hotplug_slot)
 121 {
 122         struct slot *slot = hotplug_slot->private;
 123         int retval = 0;
 124
 125         dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
 126
 127         down_write(&list_rwsem);
 128
 129         /* Unconfigure device */
 130         dbg("%s - unconfiguring slot %s",
 131             __FUNCTION__, slot->hotplug_slot->name);
 132         if ((retval = cpci_unconfigure_slot(slot))) {
 133                 err("%s - could not unconfigure slot %s",
 134                     __FUNCTION__, slot->hotplug_slot->name);
 135                 goto disable_error;
 136         }
 137         dbg("%s - finished unconfiguring slot %s",
 138             __FUNCTION__, slot->hotplug_slot->name);
 139
 140         /* Clear EXT (by setting it) */
 141         if (cpci_clear_ext(slot)) {
 142                 err("%s - could not clear EXT for slot %s",
 143                     __FUNCTION__, slot->hotplug_slot->name);
 144                 retval = -ENODEV;
 145                 goto disable_error;
 146         }
 147         cpci_led_on(slot);
 148
 149         if (controller->ops->set_power)
 150                 if ((retval = controller->ops->set_power(slot, 0)))
 151                         goto disable_error;
 152
 153         if (update_adapter_status(slot->hotplug_slot, 0))
 154                 warn("failure to update adapter file");
 155
 156         if (slot->extracting) {
 157                 slot->extracting = 0;
 158                 atomic_dec(&extracting);
 159         }
 160 disable_error:
 161         up_write(&list_rwsem);
 162         return retval;
 163 }
 164
 165 static u8
 166 cpci_get_power_status(struct slot *slot)
 167 {
 168         u8 power = 1;
 169
 170         if (controller->ops->get_power)
 171                 power = controller->ops->get_power(slot);
 172         return power;
 173 }
 174
 175 static int
 176 get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
 177 {
 178         struct slot *slot = hotplug_slot->private;
 179
 180         *value = cpci_get_power_status(slot);
 181         return 0;
 182 }
 183
 184 static int
 185 get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
 186 {
 187         struct slot *slot = hotplug_slot->private;
 188
 189         *value = cpci_get_attention_status(slot);
 190         return 0;
 191 }
 192
 193 static int
 194 set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 195 {
 196         return cpci_set_attention_status(hotplug_slot->private, status);
 197 }
 198
 199 static int
 200 get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
 201 {
 202         *value = hotplug_slot->info->adapter_status;
 203         return 0;
 204 }
 205
 206 static int
 207 get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value)
 208 {
 209         *value = hotplug_slot->info->latch_status;
 210         return 0;
 211 }
 212
 213 static void release_slot(struct hotplug_slot *hotplug_slot)
 214 {
 215         struct slot *slot = hotplug_slot->private;
 216
 217         kfree(slot->hotplug_slot->info);
 218         kfree(slot->hotplug_slot->name);
 219         kfree(slot->hotplug_slot);
 220         if (slot->dev)
 221                 pci_dev_put(slot->dev);
 222         kfree(slot);
 223 }
 224
 225 #define SLOT_NAME_SIZE  6
 226 static void
 227 make_slot_name(struct slot *slot)
 228 {
 229         snprintf(slot->hotplug_slot->name,
 230                  SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number);
 231 }
 232
 233 int
 234 cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
 235 {
 236         struct slot *slot;
 237         struct hotplug_slot *hotplug_slot;
 238         struct hotplug_slot_info *info;
 239         char *name;
 240         int status = -ENOMEM;
 241         int i;
 242
 243         if (!(controller && bus))
 244                 return -ENODEV;
 245
 246         /*
 247          * Create a structure for each slot, and register that slot
 248          * with the pci_hotplug subsystem.
 249          */
 250         for (i = first; i <= last; ++i) {
 251                 slot = kmalloc(sizeof (struct slot), GFP_KERNEL);
 252                 if (!slot)
 253                         goto error;
 254                 memset(slot, 0, sizeof (struct slot));
 255
 256                 hotplug_slot =
 257                     kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
 258                 if (!hotplug_slot)
 259                         goto error_slot;
 260                 memset(hotplug_slot, 0, sizeof (struct hotplug_slot));
 261                 slot->hotplug_slot = hotplug_slot;
 262
 263                 info = kmalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
 264                 if (!info)
 265                         goto error_hpslot;
 266                 memset(info, 0, sizeof (struct hotplug_slot_info));
 267                 hotplug_slot->info = info;
 268
 269                 name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
 270                 if (!name)
 271                         goto error_info;
 272                 hotplug_slot->name = name;
 273
 274                 slot->bus = bus;
 275                 slot->number = i;
 276                 slot->devfn = PCI_DEVFN(i, 0);
 277
 278                 hotplug_slot->private = slot;
 279                 hotplug_slot->release = &release_slot;
 280                 make_slot_name(slot);
 281                 hotplug_slot->ops = &cpci_hotplug_slot_ops;
 282
 283                 /*
 284                  * Initialize the slot info structure with some known
 285                  * good values.
 286                  */
 287                 dbg("initializing slot %s", slot->hotplug_slot->name);
 288                 info->power_status = cpci_get_power_status(slot);
 289                 info->attention_status = cpci_get_attention_status(slot);
 290
 291                 dbg("registering slot %s", slot->hotplug_slot->name);
 292                 status = pci_hp_register(slot->hotplug_slot);
 293                 if (status) {
 294                         err("pci_hp_register failed with error %d", status);
 295                         goto error_name;
 296                 }
 297
 298                 /* Add slot to our internal list */
 299                 down_write(&list_rwsem);
 300                 list_add(&slot->slot_list, &slot_list);
 301                 slots++;
 302                 up_write(&list_rwsem);
 303         }
 304         return 0;
 305 error_name:
 306         kfree(name);
 307 error_info:
 308         kfree(info);
 309 error_hpslot:
 310         kfree(hotplug_slot);
 311 error_slot:
 312         kfree(slot);
 313 error:
 314         return status;
 315 }
 316
 317 int
 318 cpci_hp_unregister_bus(struct pci_bus *bus)
 319 {
 320         struct slot *slot;
 321         struct slot *tmp;
 322         int status = 0;
 323
 324         down_write(&list_rwsem);
 325         if (!slots) {
 326                 up_write(&list_rwsem);
 327                 return -1;
 328         }
 329         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
 330                 if (slot->bus == bus) {
 331                         list_del(&slot->slot_list);
 332                         slots--;
 333
 334                         dbg("deregistering slot %s", slot->hotplug_slot->name);
 335                         status = pci_hp_deregister(slot->hotplug_slot);
 336                         if (status) {
 337                                 err("pci_hp_deregister failed with error %d",
 338                                     status);
 339                                 break;
 340                         }
 341                 }
 342         }
 343         up_write(&list_rwsem);
 344         return status;
 345 }
 346
 347 /* This is the interrupt mode interrupt handler */
 348 static irqreturn_t
 349 cpci_hp_intr(int irq, void *data, struct pt_regs *regs)
 350 {
 351         dbg("entered cpci_hp_intr");
 352
 353         /* Check to see if it was our interrupt */
 354         if ((controller->irq_flags & SA_SHIRQ) &&
 355             !controller->ops->check_irq(controller->dev_id)) {
 356                 dbg("exited cpci_hp_intr, not our interrupt");
 357                 return IRQ_NONE;
 358         }
 359
 360         /* Disable ENUM interrupt */
 361         controller->ops->disable_irq();
 362
 363         /* Trigger processing by the event thread */
 364         dbg("Signal event_semaphore");
 365         up(&event_semaphore);
 366         dbg("exited cpci_hp_intr");
 367         return IRQ_HANDLED;
 368 }
 369
 370 /*
 371  * According to PICMG 2.1 R2.0, section 6.3.2, upon
 372  * initialization, the system driver shall clear the
 373  * INS bits of the cold-inserted devices.
 374  */
 375 static int
 376 init_slots(int clear_ins)
 377 {
 378         struct slot *slot;
 379         struct pci_dev* dev;
 380
 381         dbg("%s - enter", __FUNCTION__);
 382         down_read(&list_rwsem);
 383         if (!slots) {
 384                 up_read(&list_rwsem);
 385                 return -1;
 386         }
 387         list_for_each_entry(slot, &slot_list, slot_list) {
 388                 dbg("%s - looking at slot %s",
 389                     __FUNCTION__, slot->hotplug_slot->name);
 390                 if (clear_ins && cpci_check_and_clear_ins(slot))
 391                         dbg("%s - cleared INS for slot %s",
 392                             __FUNCTION__, slot->hotplug_slot->name);
 393                 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
 394                 if (dev) {
 395                         if (update_adapter_status(slot->hotplug_slot, 1))
 396                                 warn("failure to update adapter file");
 397                         if (update_latch_status(slot->hotplug_slot, 1))
 398                                 warn("failure to update latch file");
 399                         slot->dev = dev;
 400                 }
 401         }
 402         up_read(&list_rwsem);
 403         dbg("%s - exit", __FUNCTION__);
 404         return 0;
 405 }
 406
 407 static int
 408 check_slots(void)
 409 {
 410         struct slot *slot;
 411         int extracted;
 412         int inserted;
 413         u16 hs_csr;
 414
 415         down_read(&list_rwsem);
 416         if (!slots) {
 417                 up_read(&list_rwsem);
 418                 err("no slots registered, shutting down");
 419                 return -1;
 420         }
 421         extracted = inserted = 0;
 422         list_for_each_entry(slot, &slot_list, slot_list) {
 423                 dbg("%s - looking at slot %s",
 424                     __FUNCTION__, slot->hotplug_slot->name);
 425                 if (cpci_check_and_clear_ins(slot)) {
 426                         /*
 427                          * Some broken hardware (e.g. PLX 9054AB) asserts
 428                          * ENUM# twice...
 429                          */
 430                         if (slot->dev) {
 431                                 warn("slot %s already inserted",
 432                                      slot->hotplug_slot->name);
 433                                 inserted++;
 434                                 continue;
 435                         }
 436
 437                         /* Process insertion */
 438                         dbg("%s - slot %s inserted",
 439                             __FUNCTION__, slot->hotplug_slot->name);
 440
 441                         /* GSM, debug */
 442                         hs_csr = cpci_get_hs_csr(slot);
 443                         dbg("%s - slot %s HS_CSR (1) = %04x",
 444                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 445
 446                         /* Configure device */
 447                         dbg("%s - configuring slot %s",
 448                             __FUNCTION__, slot->hotplug_slot->name);
 449                         if (cpci_configure_slot(slot)) {
 450                                 err("%s - could not configure slot %s",
 451                                     __FUNCTION__, slot->hotplug_slot->name);
 452                                 continue;
 453                         }
 454                         dbg("%s - finished configuring slot %s",
 455                             __FUNCTION__, slot->hotplug_slot->name);
 456
 457                         /* GSM, debug */
 458                         hs_csr = cpci_get_hs_csr(slot);
 459                         dbg("%s - slot %s HS_CSR (2) = %04x",
 460                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 461
 462                         if (update_latch_status(slot->hotplug_slot, 1))
 463                                 warn("failure to update latch file");
 464
 465                         if (update_adapter_status(slot->hotplug_slot, 1))
 466                                 warn("failure to update adapter file");
 467
 468                         cpci_led_off(slot);
 469
 470                         /* GSM, debug */
 471                         hs_csr = cpci_get_hs_csr(slot);
 472                         dbg("%s - slot %s HS_CSR (3) = %04x",
 473                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 474
 475                         inserted++;
 476                 } else if (cpci_check_ext(slot)) {
 477                         /* Process extraction request */
 478                         dbg("%s - slot %s extracted",
 479                             __FUNCTION__, slot->hotplug_slot->name);
 480
 481                         /* GSM, debug */
 482                         hs_csr = cpci_get_hs_csr(slot);
 483                         dbg("%s - slot %s HS_CSR = %04x",
 484                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
 485
 486                         if (!slot->extracting) {
 487                                 if (update_latch_status(slot->hotplug_slot, 0)) {
 488                                         warn("failure to update latch file");
 489                                 }
 490                                 slot->extracting = 1;
 491                                 atomic_inc(&extracting);
 492                         }
 493                         extracted++;
 494                 } else if (slot->extracting) {
 495                         hs_csr = cpci_get_hs_csr(slot);
 496                         if (hs_csr == 0xffff) {
 497                                 /*
 498                                  * Hmmm, we're likely hosed at this point, should we
 499                                  * bother trying to tell the driver or not?
 500                                  */
 501                                 err("card in slot %s was improperly removed",
 502                                     slot->hotplug_slot->name);
 503                                 if (update_adapter_status(slot->hotplug_slot, 0))
 504                                         warn("failure to update adapter file");
 505                                 slot->extracting = 0;
 506                                 atomic_dec(&extracting);
 507                         }
 508                 }
 509         }
 510         up_read(&list_rwsem);
 511         dbg("inserted=%d, extracted=%d, extracting=%d",
 512             inserted, extracted, atomic_read(&extracting));
 513         if (inserted || extracted)
 514                 return extracted;
 515         else if (!atomic_read(&extracting)) {
 516                 err("cannot find ENUM# source, shutting down");
 517                 return -1;
 518         }
 519         return 0;
 520 }
 521
 522 /* This is the interrupt mode worker thread body */
 523 static int
 524 event_thread(void *data)
 525 {
 526         int rc;
 527
 528         lock_kernel();
 529         daemonize("cpci_hp_eventd");
 530         unlock_kernel();
 531
 532         dbg("%s - event thread started", __FUNCTION__);
 533         while (1) {
 534                 dbg("event thread sleeping");
 535                 down_interruptible(&event_semaphore);
 536                 dbg("event thread woken, thread_finished = %d",
 537                     thread_finished);
 538                 if (thread_finished || signal_pending(current))
 539                         break;
 540                 do {
 541                         rc = check_slots();
 542                         if (rc > 0) {
 543                                 /* Give userspace a chance to handle extraction */
 544                                 msleep(500);
 545                         } else if (rc < 0) {
 546                                 dbg("%s - error checking slots", __FUNCTION__);
 547                                 thread_finished = 1;
 548                                 break;
 549                         }
 550                 } while (atomic_read(&extracting) && !thread_finished);
 551                 if (thread_finished)
 552                         break;
 553
 554                 /* Re-enable ENUM# interrupt */
 555                 dbg("%s - re-enabling irq", __FUNCTION__);
 556                 controller->ops->enable_irq();
 557         }
 558         dbg("%s - event thread signals exit", __FUNCTION__);
 559         up(&thread_exit);
 560         return 0;
 561 }
 562
 563 /* This is the polling mode worker thread body */
 564 static int
 565 poll_thread(void *data)
 566 {
 567         int rc;
 568
 569         lock_kernel();
 570         daemonize("cpci_hp_polld");
 571         unlock_kernel();
 572
 573         while (1) {
 574                 if (thread_finished || signal_pending(current))
 575                         break;
 576                 if (controller->ops->query_enum()) {
 577                         do {
 578                                 rc = check_slots();
 579                                 if (rc > 0) {
 580                                         /* Give userspace a chance to handle extraction */
 581                                         msleep(500);
 582                                 } else if (rc < 0) {
 583                                         dbg("%s - error checking slots", __FUNCTION__);
 584                                         thread_finished = 1;
 585                                         break;
 586                                 }
 587                         } while (atomic_read(&extracting) && !thread_finished);
 588                 }
 589                 msleep(100);
 590         }
 591         dbg("poll thread signals exit");
 592         up(&thread_exit);
 593         return 0;
 594 }
 595
 596 static int
 597 cpci_start_thread(void)
 598 {
 599         int pid;
 600
 601         /* initialize our semaphores */
 602         init_MUTEX_LOCKED(&event_semaphore);
 603         init_MUTEX_LOCKED(&thread_exit);
 604         thread_finished = 0;
 605
 606         if (controller->irq)
 607                 pid = kernel_thread(event_thread, NULL, 0);
 608         else
 609                 pid = kernel_thread(poll_thread, NULL, 0);
 610         if (pid < 0) {
 611                 err("Can't start up our thread");
 612                 return -1;
 613         }
 614         dbg("Our thread pid = %d", pid);
 615         return 0;
 616 }
 617
 618 static void
 619 cpci_stop_thread(void)
 620 {
 621         thread_finished = 1;
 622         dbg("thread finish command given");
 623         if (controller->irq)
 624                 up(&event_semaphore);
 625         dbg("wait for thread to exit");
 626         down(&thread_exit);
 627 }
 628
 629 int
 630 cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
 631 {
 632         int status = 0;
 633
 634         if (controller)
 635                 return -1;
 636         if (!(new_controller && new_controller->ops))
 637                 return -EINVAL;
 638         if (new_controller->irq) {
 639                 if (!(new_controller->ops->enable_irq &&
 640                      new_controller->ops->disable_irq))
 641                         status = -EINVAL;
 642                 if (request_irq(new_controller->irq,
 643                                cpci_hp_intr,
 644                                new_controller->irq_flags,
 645                                MY_NAME,
 646                                new_controller->dev_id)) {
 647                         err("Can't get irq %d for the hotplug cPCI controller",
 648                             new_controller->irq);
 649                         status = -ENODEV;
 650                 }
 651                 dbg("%s - acquired controller irq %d",
 652                     __FUNCTION__, new_controller->irq);
 653         }
 654         if (!status)
 655                 controller = new_controller;
 656         return status;
 657 }
 658
 659 static void
 660 cleanup_slots(void)
 661 {
 662         struct slot *slot;
 663         struct slot *tmp;
 664
 665         /*
 666          * Unregister all of our slots with the pci_hotplug subsystem,
 667          * and free up all memory that we had allocated.
 668          */
 669         down_write(&list_rwsem);
 670         if (!slots)
 671                 goto cleanup_null;
 672         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
 673                 list_del(&slot->slot_list);
 674                 pci_hp_deregister(slot->hotplug_slot);
 675         }
 676 cleanup_null:
 677         up_write(&list_rwsem);
 678         return;
 679 }
 680
 681 int
 682 cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
 683 {
 684         int status = 0;
 685
 686         if (controller) {
 687                 if (!thread_finished)
 688                         cpci_stop_thread();
 689                 if (controller->irq)
 690                         free_irq(controller->irq, controller->dev_id);
 691                 controller = NULL;
 692                 cleanup_slots();
 693         } else
 694                 status = -ENODEV;
 695         return status;
 696 }
 697
 698 int
 699 cpci_hp_start(void)
 700 {
 701         static int first = 1;
 702         int status;
 703
 704         dbg("%s - enter", __FUNCTION__);
 705         if (!controller)
 706                 return -ENODEV;
 707
 708         down_read(&list_rwsem);
 709         if (list_empty(&slot_list)) {
 710                 up_read(&list_rwsem);
 711                 return -ENODEV;
 712         }
 713         up_read(&list_rwsem);
 714
 715         status = init_slots(first);
 716         if (first)
 717                 first = 0;
 718         if (status)
 719                 return status;
 720
 721         status = cpci_start_thread();
 722         if (status)
 723                 return status;
 724         dbg("%s - thread started", __FUNCTION__);
 725
 726         if (controller->irq) {
 727                 /* Start enum interrupt processing */
 728                 dbg("%s - enabling irq", __FUNCTION__);
 729                 controller->ops->enable_irq();
 730         }
 731         dbg("%s - exit", __FUNCTION__);
 732         return 0;
 733 }
 734
 735 int
 736 cpci_hp_stop(void)
 737 {
 738         if (!controller)
 739                 return -ENODEV;
 740         if (controller->irq) {
 741                 /* Stop enum interrupt processing */
 742                 dbg("%s - disabling irq", __FUNCTION__);
 743                 controller->ops->disable_irq();
 744         }
 745         cpci_stop_thread();
 746         return 0;
 747 }
 748
 749 int __init
 750 cpci_hotplug_init(int debug)
 751 {
 752         cpci_debug = debug;
 753         return 0;
 754 }
 755
 756 void __exit
 757 cpci_hotplug_exit(void)
 758 {
 759         /*
 760          * Clean everything up.
 761          */
 762         cpci_hp_stop();
 763         cpci_hp_unregister_controller(controller);
 764 }
 765
 766 EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
 767 EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
 768 EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
 769 EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
 770 EXPORT_SYMBOL_GPL(cpci_hp_start);
 771 EXPORT_SYMBOL_GPL(cpci_hp_stop);