Merge branch 'upstream'
[linux-2.6] / 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 = kzalloc(sizeof (struct slot), GFP_KERNEL);
252                 if (!slot)
253                         goto error;
254
255                 hotplug_slot =
256                         kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
257                 if (!hotplug_slot)
258                         goto error_slot;
259                 slot->hotplug_slot = hotplug_slot;
260
261                 info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
262                 if (!info)
263                         goto error_hpslot;
264                 hotplug_slot->info = info;
265
266                 name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
267                 if (!name)
268                         goto error_info;
269                 hotplug_slot->name = name;
270
271                 slot->bus = bus;
272                 slot->number = i;
273                 slot->devfn = PCI_DEVFN(i, 0);
274
275                 hotplug_slot->private = slot;
276                 hotplug_slot->release = &release_slot;
277                 make_slot_name(slot);
278                 hotplug_slot->ops = &cpci_hotplug_slot_ops;
279
280                 /*
281                  * Initialize the slot info structure with some known
282                  * good values.
283                  */
284                 dbg("initializing slot %s", slot->hotplug_slot->name);
285                 info->power_status = cpci_get_power_status(slot);
286                 info->attention_status = cpci_get_attention_status(slot);
287
288                 dbg("registering slot %s", slot->hotplug_slot->name);
289                 status = pci_hp_register(slot->hotplug_slot);
290                 if (status) {
291                         err("pci_hp_register failed with error %d", status);
292                         goto error_name;
293                 }
294
295                 /* Add slot to our internal list */
296                 down_write(&list_rwsem);
297                 list_add(&slot->slot_list, &slot_list);
298                 slots++;
299                 up_write(&list_rwsem);
300         }
301         return 0;
302 error_name:
303         kfree(name);
304 error_info:
305         kfree(info);
306 error_hpslot:
307         kfree(hotplug_slot);
308 error_slot:
309         kfree(slot);
310 error:
311         return status;
312 }
313
314 int
315 cpci_hp_unregister_bus(struct pci_bus *bus)
316 {
317         struct slot *slot;
318         struct slot *tmp;
319         int status = 0;
320
321         down_write(&list_rwsem);
322         if (!slots) {
323                 up_write(&list_rwsem);
324                 return -1;
325         }
326         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
327                 if (slot->bus == bus) {
328                         list_del(&slot->slot_list);
329                         slots--;
330
331                         dbg("deregistering slot %s", slot->hotplug_slot->name);
332                         status = pci_hp_deregister(slot->hotplug_slot);
333                         if (status) {
334                                 err("pci_hp_deregister failed with error %d",
335                                     status);
336                                 break;
337                         }
338                 }
339         }
340         up_write(&list_rwsem);
341         return status;
342 }
343
344 /* This is the interrupt mode interrupt handler */
345 static irqreturn_t
346 cpci_hp_intr(int irq, void *data, struct pt_regs *regs)
347 {
348         dbg("entered cpci_hp_intr");
349
350         /* Check to see if it was our interrupt */
351         if ((controller->irq_flags & SA_SHIRQ) &&
352             !controller->ops->check_irq(controller->dev_id)) {
353                 dbg("exited cpci_hp_intr, not our interrupt");
354                 return IRQ_NONE;
355         }
356
357         /* Disable ENUM interrupt */
358         controller->ops->disable_irq();
359
360         /* Trigger processing by the event thread */
361         dbg("Signal event_semaphore");
362         up(&event_semaphore);
363         dbg("exited cpci_hp_intr");
364         return IRQ_HANDLED;
365 }
366
367 /*
368  * According to PICMG 2.1 R2.0, section 6.3.2, upon
369  * initialization, the system driver shall clear the
370  * INS bits of the cold-inserted devices.
371  */
372 static int
373 init_slots(int clear_ins)
374 {
375         struct slot *slot;
376         struct pci_dev* dev;
377
378         dbg("%s - enter", __FUNCTION__);
379         down_read(&list_rwsem);
380         if (!slots) {
381                 up_read(&list_rwsem);
382                 return -1;
383         }
384         list_for_each_entry(slot, &slot_list, slot_list) {
385                 dbg("%s - looking at slot %s",
386                     __FUNCTION__, slot->hotplug_slot->name);
387                 if (clear_ins && cpci_check_and_clear_ins(slot))
388                         dbg("%s - cleared INS for slot %s",
389                             __FUNCTION__, slot->hotplug_slot->name);
390                 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
391                 if (dev) {
392                         if (update_adapter_status(slot->hotplug_slot, 1))
393                                 warn("failure to update adapter file");
394                         if (update_latch_status(slot->hotplug_slot, 1))
395                                 warn("failure to update latch file");
396                         slot->dev = dev;
397                 }
398         }
399         up_read(&list_rwsem);
400         dbg("%s - exit", __FUNCTION__);
401         return 0;
402 }
403
404 static int
405 check_slots(void)
406 {
407         struct slot *slot;
408         int extracted;
409         int inserted;
410         u16 hs_csr;
411
412         down_read(&list_rwsem);
413         if (!slots) {
414                 up_read(&list_rwsem);
415                 err("no slots registered, shutting down");
416                 return -1;
417         }
418         extracted = inserted = 0;
419         list_for_each_entry(slot, &slot_list, slot_list) {
420                 dbg("%s - looking at slot %s",
421                     __FUNCTION__, slot->hotplug_slot->name);
422                 if (cpci_check_and_clear_ins(slot)) {
423                         /*
424                          * Some broken hardware (e.g. PLX 9054AB) asserts
425                          * ENUM# twice...
426                          */
427                         if (slot->dev) {
428                                 warn("slot %s already inserted",
429                                      slot->hotplug_slot->name);
430                                 inserted++;
431                                 continue;
432                         }
433
434                         /* Process insertion */
435                         dbg("%s - slot %s inserted",
436                             __FUNCTION__, slot->hotplug_slot->name);
437
438                         /* GSM, debug */
439                         hs_csr = cpci_get_hs_csr(slot);
440                         dbg("%s - slot %s HS_CSR (1) = %04x",
441                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
442
443                         /* Configure device */
444                         dbg("%s - configuring slot %s",
445                             __FUNCTION__, slot->hotplug_slot->name);
446                         if (cpci_configure_slot(slot)) {
447                                 err("%s - could not configure slot %s",
448                                     __FUNCTION__, slot->hotplug_slot->name);
449                                 continue;
450                         }
451                         dbg("%s - finished configuring slot %s",
452                             __FUNCTION__, slot->hotplug_slot->name);
453
454                         /* GSM, debug */
455                         hs_csr = cpci_get_hs_csr(slot);
456                         dbg("%s - slot %s HS_CSR (2) = %04x",
457                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
458
459                         if (update_latch_status(slot->hotplug_slot, 1))
460                                 warn("failure to update latch file");
461
462                         if (update_adapter_status(slot->hotplug_slot, 1))
463                                 warn("failure to update adapter file");
464
465                         cpci_led_off(slot);
466
467                         /* GSM, debug */
468                         hs_csr = cpci_get_hs_csr(slot);
469                         dbg("%s - slot %s HS_CSR (3) = %04x",
470                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
471
472                         inserted++;
473                 } else if (cpci_check_ext(slot)) {
474                         /* Process extraction request */
475                         dbg("%s - slot %s extracted",
476                             __FUNCTION__, slot->hotplug_slot->name);
477
478                         /* GSM, debug */
479                         hs_csr = cpci_get_hs_csr(slot);
480                         dbg("%s - slot %s HS_CSR = %04x",
481                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
482
483                         if (!slot->extracting) {
484                                 if (update_latch_status(slot->hotplug_slot, 0)) {
485                                         warn("failure to update latch file");
486                                 }
487                                 slot->extracting = 1;
488                                 atomic_inc(&extracting);
489                         }
490                         extracted++;
491                 } else if (slot->extracting) {
492                         hs_csr = cpci_get_hs_csr(slot);
493                         if (hs_csr == 0xffff) {
494                                 /*
495                                  * Hmmm, we're likely hosed at this point, should we
496                                  * bother trying to tell the driver or not?
497                                  */
498                                 err("card in slot %s was improperly removed",
499                                     slot->hotplug_slot->name);
500                                 if (update_adapter_status(slot->hotplug_slot, 0))
501                                         warn("failure to update adapter file");
502                                 slot->extracting = 0;
503                                 atomic_dec(&extracting);
504                         }
505                 }
506         }
507         up_read(&list_rwsem);
508         dbg("inserted=%d, extracted=%d, extracting=%d",
509             inserted, extracted, atomic_read(&extracting));
510         if (inserted || extracted)
511                 return extracted;
512         else if (!atomic_read(&extracting)) {
513                 err("cannot find ENUM# source, shutting down");
514                 return -1;
515         }
516         return 0;
517 }
518
519 /* This is the interrupt mode worker thread body */
520 static int
521 event_thread(void *data)
522 {
523         int rc;
524
525         lock_kernel();
526         daemonize("cpci_hp_eventd");
527         unlock_kernel();
528
529         dbg("%s - event thread started", __FUNCTION__);
530         while (1) {
531                 dbg("event thread sleeping");
532                 down_interruptible(&event_semaphore);
533                 dbg("event thread woken, thread_finished = %d",
534                     thread_finished);
535                 if (thread_finished || signal_pending(current))
536                         break;
537                 do {
538                         rc = check_slots();
539                         if (rc > 0) {
540                                 /* Give userspace a chance to handle extraction */
541                                 msleep(500);
542                         } else if (rc < 0) {
543                                 dbg("%s - error checking slots", __FUNCTION__);
544                                 thread_finished = 1;
545                                 break;
546                         }
547                 } while (atomic_read(&extracting) && !thread_finished);
548                 if (thread_finished)
549                         break;
550
551                 /* Re-enable ENUM# interrupt */
552                 dbg("%s - re-enabling irq", __FUNCTION__);
553                 controller->ops->enable_irq();
554         }
555         dbg("%s - event thread signals exit", __FUNCTION__);
556         up(&thread_exit);
557         return 0;
558 }
559
560 /* This is the polling mode worker thread body */
561 static int
562 poll_thread(void *data)
563 {
564         int rc;
565
566         lock_kernel();
567         daemonize("cpci_hp_polld");
568         unlock_kernel();
569
570         while (1) {
571                 if (thread_finished || signal_pending(current))
572                         break;
573                 if (controller->ops->query_enum()) {
574                         do {
575                                 rc = check_slots();
576                                 if (rc > 0) {
577                                         /* Give userspace a chance to handle extraction */
578                                         msleep(500);
579                                 } else if (rc < 0) {
580                                         dbg("%s - error checking slots", __FUNCTION__);
581                                         thread_finished = 1;
582                                         break;
583                                 }
584                         } while (atomic_read(&extracting) && !thread_finished);
585                 }
586                 msleep(100);
587         }
588         dbg("poll thread signals exit");
589         up(&thread_exit);
590         return 0;
591 }
592
593 static int
594 cpci_start_thread(void)
595 {
596         int pid;
597
598         /* initialize our semaphores */
599         init_MUTEX_LOCKED(&event_semaphore);
600         init_MUTEX_LOCKED(&thread_exit);
601         thread_finished = 0;
602
603         if (controller->irq)
604                 pid = kernel_thread(event_thread, NULL, 0);
605         else
606                 pid = kernel_thread(poll_thread, NULL, 0);
607         if (pid < 0) {
608                 err("Can't start up our thread");
609                 return -1;
610         }
611         dbg("Our thread pid = %d", pid);
612         return 0;
613 }
614
615 static void
616 cpci_stop_thread(void)
617 {
618         thread_finished = 1;
619         dbg("thread finish command given");
620         if (controller->irq)
621                 up(&event_semaphore);
622         dbg("wait for thread to exit");
623         down(&thread_exit);
624 }
625
626 int
627 cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
628 {
629         int status = 0;
630
631         if (controller)
632                 return -1;
633         if (!(new_controller && new_controller->ops))
634                 return -EINVAL;
635         if (new_controller->irq) {
636                 if (!(new_controller->ops->enable_irq &&
637                      new_controller->ops->disable_irq))
638                         status = -EINVAL;
639                 if (request_irq(new_controller->irq,
640                                cpci_hp_intr,
641                                new_controller->irq_flags,
642                                MY_NAME,
643                                new_controller->dev_id)) {
644                         err("Can't get irq %d for the hotplug cPCI controller",
645                             new_controller->irq);
646                         status = -ENODEV;
647                 }
648                 dbg("%s - acquired controller irq %d",
649                     __FUNCTION__, new_controller->irq);
650         }
651         if (!status)
652                 controller = new_controller;
653         return status;
654 }
655
656 static void
657 cleanup_slots(void)
658 {
659         struct slot *slot;
660         struct slot *tmp;
661
662         /*
663          * Unregister all of our slots with the pci_hotplug subsystem,
664          * and free up all memory that we had allocated.
665          */
666         down_write(&list_rwsem);
667         if (!slots)
668                 goto cleanup_null;
669         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
670                 list_del(&slot->slot_list);
671                 pci_hp_deregister(slot->hotplug_slot);
672         }
673 cleanup_null:
674         up_write(&list_rwsem);
675         return;
676 }
677
678 int
679 cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
680 {
681         int status = 0;
682
683         if (controller) {
684                 if (!thread_finished)
685                         cpci_stop_thread();
686                 if (controller->irq)
687                         free_irq(controller->irq, controller->dev_id);
688                 controller = NULL;
689                 cleanup_slots();
690         } else
691                 status = -ENODEV;
692         return status;
693 }
694
695 int
696 cpci_hp_start(void)
697 {
698         static int first = 1;
699         int status;
700
701         dbg("%s - enter", __FUNCTION__);
702         if (!controller)
703                 return -ENODEV;
704
705         down_read(&list_rwsem);
706         if (list_empty(&slot_list)) {
707                 up_read(&list_rwsem);
708                 return -ENODEV;
709         }
710         up_read(&list_rwsem);
711
712         status = init_slots(first);
713         if (first)
714                 first = 0;
715         if (status)
716                 return status;
717
718         status = cpci_start_thread();
719         if (status)
720                 return status;
721         dbg("%s - thread started", __FUNCTION__);
722
723         if (controller->irq) {
724                 /* Start enum interrupt processing */
725                 dbg("%s - enabling irq", __FUNCTION__);
726                 controller->ops->enable_irq();
727         }
728         dbg("%s - exit", __FUNCTION__);
729         return 0;
730 }
731
732 int
733 cpci_hp_stop(void)
734 {
735         if (!controller)
736                 return -ENODEV;
737         if (controller->irq) {
738                 /* Stop enum interrupt processing */
739                 dbg("%s - disabling irq", __FUNCTION__);
740                 controller->ops->disable_irq();
741         }
742         cpci_stop_thread();
743         return 0;
744 }
745
746 int __init
747 cpci_hotplug_init(int debug)
748 {
749         cpci_debug = debug;
750         return 0;
751 }
752
753 void __exit
754 cpci_hotplug_exit(void)
755 {
756         /*
757          * Clean everything up.
758          */
759         cpci_hp_stop();
760         cpci_hp_unregister_controller(controller);
761 }
762
763 EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
764 EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
765 EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
766 EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
767 EXPORT_SYMBOL_GPL(cpci_hp_start);
768 EXPORT_SYMBOL_GPL(cpci_hp_stop);