IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
[linux-2.6.git] / 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/init.h>
33 #include <linux/interrupt.h>
34 #include <linux/smp_lock.h>
35 #include <asm/atomic.h>
36 #include <linux/delay.h>
37 #include "pci_hotplug.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 semaphore event_semaphore;        /* mutex for process loop (up if something to process) */
63 static struct semaphore thread_exit;            /* guard ensure thread has exited before calling it quits */
64 static int thread_finished = 1;
65
66 static int enable_slot(struct hotplug_slot *slot);
67 static int disable_slot(struct hotplug_slot *slot);
68 static int set_attention_status(struct hotplug_slot *slot, u8 value);
69 static int get_power_status(struct hotplug_slot *slot, u8 * value);
70 static int get_attention_status(struct hotplug_slot *slot, u8 * value);
71 static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
72 static int get_latch_status(struct hotplug_slot *slot, u8 * value);
73
74 static struct hotplug_slot_ops cpci_hotplug_slot_ops = {
75         .owner = THIS_MODULE,
76         .enable_slot = enable_slot,
77         .disable_slot = disable_slot,
78         .set_attention_status = set_attention_status,
79         .get_power_status = get_power_status,
80         .get_attention_status = get_attention_status,
81         .get_adapter_status = get_adapter_status,
82         .get_latch_status = get_latch_status,
83 };
84
85 static int
86 update_latch_status(struct hotplug_slot *hotplug_slot, u8 value)
87 {
88         struct hotplug_slot_info info;
89
90         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
91         info.latch_status = value;
92         return pci_hp_change_slot_info(hotplug_slot, &info);
93 }
94
95 static int
96 update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value)
97 {
98         struct hotplug_slot_info info;
99
100         memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info));
101         info.adapter_status = value;
102         return pci_hp_change_slot_info(hotplug_slot, &info);
103 }
104
105 static int
106 enable_slot(struct hotplug_slot *hotplug_slot)
107 {
108         struct slot *slot = hotplug_slot->private;
109         int retval = 0;
110
111         dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
112
113         if (controller->ops->set_power)
114                 retval = controller->ops->set_power(slot, 1);
115         return retval;
116 }
117
118 static int
119 disable_slot(struct hotplug_slot *hotplug_slot)
120 {
121         struct slot *slot = hotplug_slot->private;
122         int retval = 0;
123
124         dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name);
125
126         down_write(&list_rwsem);
127
128         /* Unconfigure device */
129         dbg("%s - unconfiguring slot %s",
130             __FUNCTION__, slot->hotplug_slot->name);
131         if ((retval = cpci_unconfigure_slot(slot))) {
132                 err("%s - could not unconfigure slot %s",
133                     __FUNCTION__, slot->hotplug_slot->name);
134                 goto disable_error;
135         }
136         dbg("%s - finished unconfiguring slot %s",
137             __FUNCTION__, slot->hotplug_slot->name);
138
139         /* Clear EXT (by setting it) */
140         if (cpci_clear_ext(slot)) {
141                 err("%s - could not clear EXT for slot %s",
142                     __FUNCTION__, slot->hotplug_slot->name);
143                 retval = -ENODEV;
144                 goto disable_error;
145         }
146         cpci_led_on(slot);
147
148         if (controller->ops->set_power)
149                 if ((retval = controller->ops->set_power(slot, 0)))
150                         goto disable_error;
151
152         if (update_adapter_status(slot->hotplug_slot, 0))
153                 warn("failure to update adapter file");
154
155         if (slot->extracting) {
156                 slot->extracting = 0;
157                 atomic_dec(&extracting);
158         }
159 disable_error:
160         up_write(&list_rwsem);
161         return retval;
162 }
163
164 static u8
165 cpci_get_power_status(struct slot *slot)
166 {
167         u8 power = 1;
168
169         if (controller->ops->get_power)
170                 power = controller->ops->get_power(slot);
171         return power;
172 }
173
174 static int
175 get_power_status(struct hotplug_slot *hotplug_slot, u8 * value)
176 {
177         struct slot *slot = hotplug_slot->private;
178
179         *value = cpci_get_power_status(slot);
180         return 0;
181 }
182
183 static int
184 get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value)
185 {
186         struct slot *slot = hotplug_slot->private;
187
188         *value = cpci_get_attention_status(slot);
189         return 0;
190 }
191
192 static int
193 set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
194 {
195         return cpci_set_attention_status(hotplug_slot->private, status);
196 }
197
198 static int
199 get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
200 {
201         *value = hotplug_slot->info->adapter_status;
202         return 0;
203 }
204
205 static int
206 get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value)
207 {
208         *value = hotplug_slot->info->latch_status;
209         return 0;
210 }
211
212 static void release_slot(struct hotplug_slot *hotplug_slot)
213 {
214         struct slot *slot = hotplug_slot->private;
215
216         kfree(slot->hotplug_slot->info);
217         kfree(slot->hotplug_slot->name);
218         kfree(slot->hotplug_slot);
219         if (slot->dev)
220                 pci_dev_put(slot->dev);
221         kfree(slot);
222 }
223
224 #define SLOT_NAME_SIZE  6
225 static void
226 make_slot_name(struct slot *slot)
227 {
228         snprintf(slot->hotplug_slot->name,
229                  SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number);
230 }
231
232 int
233 cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
234 {
235         struct slot *slot;
236         struct hotplug_slot *hotplug_slot;
237         struct hotplug_slot_info *info;
238         char *name;
239         int status = -ENOMEM;
240         int i;
241
242         if (!(controller && bus))
243                 return -ENODEV;
244
245         /*
246          * Create a structure for each slot, and register that slot
247          * with the pci_hotplug subsystem.
248          */
249         for (i = first; i <= last; ++i) {
250                 slot = kzalloc(sizeof (struct slot), GFP_KERNEL);
251                 if (!slot)
252                         goto error;
253
254                 hotplug_slot =
255                         kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL);
256                 if (!hotplug_slot)
257                         goto error_slot;
258                 slot->hotplug_slot = hotplug_slot;
259
260                 info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL);
261                 if (!info)
262                         goto error_hpslot;
263                 hotplug_slot->info = info;
264
265                 name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
266                 if (!name)
267                         goto error_info;
268                 hotplug_slot->name = name;
269
270                 slot->bus = bus;
271                 slot->number = i;
272                 slot->devfn = PCI_DEVFN(i, 0);
273
274                 hotplug_slot->private = slot;
275                 hotplug_slot->release = &release_slot;
276                 make_slot_name(slot);
277                 hotplug_slot->ops = &cpci_hotplug_slot_ops;
278
279                 /*
280                  * Initialize the slot info structure with some known
281                  * good values.
282                  */
283                 dbg("initializing slot %s", slot->hotplug_slot->name);
284                 info->power_status = cpci_get_power_status(slot);
285                 info->attention_status = cpci_get_attention_status(slot);
286
287                 dbg("registering slot %s", slot->hotplug_slot->name);
288                 status = pci_hp_register(slot->hotplug_slot);
289                 if (status) {
290                         err("pci_hp_register failed with error %d", status);
291                         goto error_name;
292                 }
293
294                 /* Add slot to our internal list */
295                 down_write(&list_rwsem);
296                 list_add(&slot->slot_list, &slot_list);
297                 slots++;
298                 up_write(&list_rwsem);
299         }
300         return 0;
301 error_name:
302         kfree(name);
303 error_info:
304         kfree(info);
305 error_hpslot:
306         kfree(hotplug_slot);
307 error_slot:
308         kfree(slot);
309 error:
310         return status;
311 }
312
313 int
314 cpci_hp_unregister_bus(struct pci_bus *bus)
315 {
316         struct slot *slot;
317         struct slot *tmp;
318         int status = 0;
319
320         down_write(&list_rwsem);
321         if (!slots) {
322                 up_write(&list_rwsem);
323                 return -1;
324         }
325         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
326                 if (slot->bus == bus) {
327                         list_del(&slot->slot_list);
328                         slots--;
329
330                         dbg("deregistering slot %s", slot->hotplug_slot->name);
331                         status = pci_hp_deregister(slot->hotplug_slot);
332                         if (status) {
333                                 err("pci_hp_deregister failed with error %d",
334                                     status);
335                                 break;
336                         }
337                 }
338         }
339         up_write(&list_rwsem);
340         return status;
341 }
342
343 /* This is the interrupt mode interrupt handler */
344 static irqreturn_t
345 cpci_hp_intr(int irq, void *data)
346 {
347         dbg("entered cpci_hp_intr");
348
349         /* Check to see if it was our interrupt */
350         if ((controller->irq_flags & IRQF_SHARED) &&
351             !controller->ops->check_irq(controller->dev_id)) {
352                 dbg("exited cpci_hp_intr, not our interrupt");
353                 return IRQ_NONE;
354         }
355
356         /* Disable ENUM interrupt */
357         controller->ops->disable_irq();
358
359         /* Trigger processing by the event thread */
360         dbg("Signal event_semaphore");
361         up(&event_semaphore);
362         dbg("exited cpci_hp_intr");
363         return IRQ_HANDLED;
364 }
365
366 /*
367  * According to PICMG 2.1 R2.0, section 6.3.2, upon
368  * initialization, the system driver shall clear the
369  * INS bits of the cold-inserted devices.
370  */
371 static int
372 init_slots(int clear_ins)
373 {
374         struct slot *slot;
375         struct pci_dev* dev;
376
377         dbg("%s - enter", __FUNCTION__);
378         down_read(&list_rwsem);
379         if (!slots) {
380                 up_read(&list_rwsem);
381                 return -1;
382         }
383         list_for_each_entry(slot, &slot_list, slot_list) {
384                 dbg("%s - looking at slot %s",
385                     __FUNCTION__, slot->hotplug_slot->name);
386                 if (clear_ins && cpci_check_and_clear_ins(slot))
387                         dbg("%s - cleared INS for slot %s",
388                             __FUNCTION__, slot->hotplug_slot->name);
389                 dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
390                 if (dev) {
391                         if (update_adapter_status(slot->hotplug_slot, 1))
392                                 warn("failure to update adapter file");
393                         if (update_latch_status(slot->hotplug_slot, 1))
394                                 warn("failure to update latch file");
395                         slot->dev = dev;
396                 }
397         }
398         up_read(&list_rwsem);
399         dbg("%s - exit", __FUNCTION__);
400         return 0;
401 }
402
403 static int
404 check_slots(void)
405 {
406         struct slot *slot;
407         int extracted;
408         int inserted;
409         u16 hs_csr;
410
411         down_read(&list_rwsem);
412         if (!slots) {
413                 up_read(&list_rwsem);
414                 err("no slots registered, shutting down");
415                 return -1;
416         }
417         extracted = inserted = 0;
418         list_for_each_entry(slot, &slot_list, slot_list) {
419                 dbg("%s - looking at slot %s",
420                     __FUNCTION__, slot->hotplug_slot->name);
421                 if (cpci_check_and_clear_ins(slot)) {
422                         /*
423                          * Some broken hardware (e.g. PLX 9054AB) asserts
424                          * ENUM# twice...
425                          */
426                         if (slot->dev) {
427                                 warn("slot %s already inserted",
428                                      slot->hotplug_slot->name);
429                                 inserted++;
430                                 continue;
431                         }
432
433                         /* Process insertion */
434                         dbg("%s - slot %s inserted",
435                             __FUNCTION__, slot->hotplug_slot->name);
436
437                         /* GSM, debug */
438                         hs_csr = cpci_get_hs_csr(slot);
439                         dbg("%s - slot %s HS_CSR (1) = %04x",
440                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
441
442                         /* Configure device */
443                         dbg("%s - configuring slot %s",
444                             __FUNCTION__, slot->hotplug_slot->name);
445                         if (cpci_configure_slot(slot)) {
446                                 err("%s - could not configure slot %s",
447                                     __FUNCTION__, slot->hotplug_slot->name);
448                                 continue;
449                         }
450                         dbg("%s - finished configuring slot %s",
451                             __FUNCTION__, slot->hotplug_slot->name);
452
453                         /* GSM, debug */
454                         hs_csr = cpci_get_hs_csr(slot);
455                         dbg("%s - slot %s HS_CSR (2) = %04x",
456                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
457
458                         if (update_latch_status(slot->hotplug_slot, 1))
459                                 warn("failure to update latch file");
460
461                         if (update_adapter_status(slot->hotplug_slot, 1))
462                                 warn("failure to update adapter file");
463
464                         cpci_led_off(slot);
465
466                         /* GSM, debug */
467                         hs_csr = cpci_get_hs_csr(slot);
468                         dbg("%s - slot %s HS_CSR (3) = %04x",
469                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
470
471                         inserted++;
472                 } else if (cpci_check_ext(slot)) {
473                         /* Process extraction request */
474                         dbg("%s - slot %s extracted",
475                             __FUNCTION__, slot->hotplug_slot->name);
476
477                         /* GSM, debug */
478                         hs_csr = cpci_get_hs_csr(slot);
479                         dbg("%s - slot %s HS_CSR = %04x",
480                             __FUNCTION__, slot->hotplug_slot->name, hs_csr);
481
482                         if (!slot->extracting) {
483                                 if (update_latch_status(slot->hotplug_slot, 0)) {
484                                         warn("failure to update latch file");
485                                 }
486                                 slot->extracting = 1;
487                                 atomic_inc(&extracting);
488                         }
489                         extracted++;
490                 } else if (slot->extracting) {
491                         hs_csr = cpci_get_hs_csr(slot);
492                         if (hs_csr == 0xffff) {
493                                 /*
494                                  * Hmmm, we're likely hosed at this point, should we
495                                  * bother trying to tell the driver or not?
496                                  */
497                                 err("card in slot %s was improperly removed",
498                                     slot->hotplug_slot->name);
499                                 if (update_adapter_status(slot->hotplug_slot, 0))
500                                         warn("failure to update adapter file");
501                                 slot->extracting = 0;
502                                 atomic_dec(&extracting);
503                         }
504                 }
505         }
506         up_read(&list_rwsem);
507         dbg("inserted=%d, extracted=%d, extracting=%d",
508             inserted, extracted, atomic_read(&extracting));
509         if (inserted || extracted)
510                 return extracted;
511         else if (!atomic_read(&extracting)) {
512                 err("cannot find ENUM# source, shutting down");
513                 return -1;
514         }
515         return 0;
516 }
517
518 /* This is the interrupt mode worker thread body */
519 static int
520 event_thread(void *data)
521 {
522         int rc;
523
524         lock_kernel();
525         daemonize("cpci_hp_eventd");
526         unlock_kernel();
527
528         dbg("%s - event thread started", __FUNCTION__);
529         while (1) {
530                 dbg("event thread sleeping");
531                 down_interruptible(&event_semaphore);
532                 dbg("event thread woken, thread_finished = %d",
533                     thread_finished);
534                 if (thread_finished || signal_pending(current))
535                         break;
536                 do {
537                         rc = check_slots();
538                         if (rc > 0) {
539                                 /* Give userspace a chance to handle extraction */
540                                 msleep(500);
541                         } else if (rc < 0) {
542                                 dbg("%s - error checking slots", __FUNCTION__);
543                                 thread_finished = 1;
544                                 break;
545                         }
546                 } while (atomic_read(&extracting) && !thread_finished);
547                 if (thread_finished)
548                         break;
549
550                 /* Re-enable ENUM# interrupt */
551                 dbg("%s - re-enabling irq", __FUNCTION__);
552                 controller->ops->enable_irq();
553         }
554         dbg("%s - event thread signals exit", __FUNCTION__);
555         up(&thread_exit);
556         return 0;
557 }
558
559 /* This is the polling mode worker thread body */
560 static int
561 poll_thread(void *data)
562 {
563         int rc;
564
565         lock_kernel();
566         daemonize("cpci_hp_polld");
567         unlock_kernel();
568
569         while (1) {
570                 if (thread_finished || signal_pending(current))
571                         break;
572                 if (controller->ops->query_enum()) {
573                         do {
574                                 rc = check_slots();
575                                 if (rc > 0) {
576                                         /* Give userspace a chance to handle extraction */
577                                         msleep(500);
578                                 } else if (rc < 0) {
579                                         dbg("%s - error checking slots", __FUNCTION__);
580                                         thread_finished = 1;
581                                         break;
582                                 }
583                         } while (atomic_read(&extracting) && !thread_finished);
584                 }
585                 msleep(100);
586         }
587         dbg("poll thread signals exit");
588         up(&thread_exit);
589         return 0;
590 }
591
592 static int
593 cpci_start_thread(void)
594 {
595         int pid;
596
597         /* initialize our semaphores */
598         init_MUTEX_LOCKED(&event_semaphore);
599         init_MUTEX_LOCKED(&thread_exit);
600         thread_finished = 0;
601
602         if (controller->irq)
603                 pid = kernel_thread(event_thread, NULL, 0);
604         else
605                 pid = kernel_thread(poll_thread, NULL, 0);
606         if (pid < 0) {
607                 err("Can't start up our thread");
608                 return -1;
609         }
610         dbg("Our thread pid = %d", pid);
611         return 0;
612 }
613
614 static void
615 cpci_stop_thread(void)
616 {
617         thread_finished = 1;
618         dbg("thread finish command given");
619         if (controller->irq)
620                 up(&event_semaphore);
621         dbg("wait for thread to exit");
622         down(&thread_exit);
623 }
624
625 int
626 cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
627 {
628         int status = 0;
629
630         if (controller)
631                 return -1;
632         if (!(new_controller && new_controller->ops))
633                 return -EINVAL;
634         if (new_controller->irq) {
635                 if (!(new_controller->ops->enable_irq &&
636                      new_controller->ops->disable_irq))
637                         status = -EINVAL;
638                 if (request_irq(new_controller->irq,
639                                cpci_hp_intr,
640                                new_controller->irq_flags,
641                                MY_NAME,
642                                new_controller->dev_id)) {
643                         err("Can't get irq %d for the hotplug cPCI controller",
644                             new_controller->irq);
645                         status = -ENODEV;
646                 }
647                 dbg("%s - acquired controller irq %d",
648                     __FUNCTION__, new_controller->irq);
649         }
650         if (!status)
651                 controller = new_controller;
652         return status;
653 }
654
655 static void
656 cleanup_slots(void)
657 {
658         struct slot *slot;
659         struct slot *tmp;
660
661         /*
662          * Unregister all of our slots with the pci_hotplug subsystem,
663          * and free up all memory that we had allocated.
664          */
665         down_write(&list_rwsem);
666         if (!slots)
667                 goto cleanup_null;
668         list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
669                 list_del(&slot->slot_list);
670                 pci_hp_deregister(slot->hotplug_slot);
671         }
672 cleanup_null:
673         up_write(&list_rwsem);
674         return;
675 }
676
677 int
678 cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
679 {
680         int status = 0;
681
682         if (controller) {
683                 if (!thread_finished)
684                         cpci_stop_thread();
685                 if (controller->irq)
686                         free_irq(controller->irq, controller->dev_id);
687                 controller = NULL;
688                 cleanup_slots();
689         } else
690                 status = -ENODEV;
691         return status;
692 }
693
694 int
695 cpci_hp_start(void)
696 {
697         static int first = 1;
698         int status;
699
700         dbg("%s - enter", __FUNCTION__);
701         if (!controller)
702                 return -ENODEV;
703
704         down_read(&list_rwsem);
705         if (list_empty(&slot_list)) {
706                 up_read(&list_rwsem);
707                 return -ENODEV;
708         }
709         up_read(&list_rwsem);
710
711         status = init_slots(first);
712         if (first)
713                 first = 0;
714         if (status)
715                 return status;
716
717         status = cpci_start_thread();
718         if (status)
719                 return status;
720         dbg("%s - thread started", __FUNCTION__);
721
722         if (controller->irq) {
723                 /* Start enum interrupt processing */
724                 dbg("%s - enabling irq", __FUNCTION__);
725                 controller->ops->enable_irq();
726         }
727         dbg("%s - exit", __FUNCTION__);
728         return 0;
729 }
730
731 int
732 cpci_hp_stop(void)
733 {
734         if (!controller)
735                 return -ENODEV;
736         if (controller->irq) {
737                 /* Stop enum interrupt processing */
738                 dbg("%s - disabling irq", __FUNCTION__);
739                 controller->ops->disable_irq();
740         }
741         cpci_stop_thread();
742         return 0;
743 }
744
745 int __init
746 cpci_hotplug_init(int debug)
747 {
748         cpci_debug = debug;
749         return 0;
750 }
751
752 void __exit
753 cpci_hotplug_exit(void)
754 {
755         /*
756          * Clean everything up.
757          */
758         cpci_hp_stop();
759         cpci_hp_unregister_controller(controller);
760 }
761
762 EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
763 EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
764 EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
765 EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
766 EXPORT_SYMBOL_GPL(cpci_hp_start);
767 EXPORT_SYMBOL_GPL(cpci_hp_stop);