1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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
56static DECLARE_RWSEM(list_rwsem);
57static LIST_HEAD(slot_list);
58static int slots;
59static atomic_t extracting;
60int cpci_debug;
61static struct cpci_hp_controller *controller;
62static struct task_struct *cpci_thread;
63static int thread_finished;
64
65static int enable_slot(struct hotplug_slot *slot);
66static int disable_slot(struct hotplug_slot *slot);
67static int set_attention_status(struct hotplug_slot *slot, u8 value);
68static int get_power_status(struct hotplug_slot *slot, u8 * value);
69static int get_attention_status(struct hotplug_slot *slot, u8 * value);
70static int get_adapter_status(struct hotplug_slot *slot, u8 * value);
71static int get_latch_status(struct hotplug_slot *slot, u8 * value);
72
73static 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
83static int
84update_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
93static int
94update_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
103static int
104enable_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
116static int
117disable_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
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
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 }
155disable_error:
156 up_write(&list_rwsem);
157 return retval;
158}
159
160static u8
161cpci_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
170static int
171get_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
179static int
180get_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
188static int
189set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
190{
191 return cpci_set_attention_status(hotplug_slot->private, status);
192}
193
194static int
195get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value)
196{
197 *value = hotplug_slot->info->adapter_status;
198 return 0;
199}
200
201static int
202get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value)
203{
204 *value = hotplug_slot->info->latch_status;
205 return 0;
206}
207
208static 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
221int
222cpci_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
236
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
272
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
287 down_write(&list_rwsem);
288 list_add(&slot->slot_list, &slot_list);
289 slots++;
290 up_write(&list_rwsem);
291 }
292 return 0;
293error_info:
294 kfree(info);
295error_hpslot:
296 kfree(hotplug_slot);
297error_slot:
298 kfree(slot);
299error:
300 return status;
301}
302
303int
304cpci_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
334static irqreturn_t
335cpci_hp_intr(int irq, void *data)
336{
337 dbg("entered cpci_hp_intr");
338
339
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
347 controller->ops->disable_irq();
348
349
350 wake_up_process(cpci_thread);
351 return IRQ_HANDLED;
352}
353
354
355
356
357
358
359static int
360init_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
390static int
391check_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
410
411
412 if (slot->dev) {
413 warn("slot %s already inserted",
414 slot_name(slot));
415 inserted++;
416 continue;
417 }
418
419
420 dbg("%s - slot %s inserted", __func__, slot_name(slot));
421
422
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
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
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
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
459 dbg("%s - slot %s extracted",
460 __func__, slot_name(slot));
461
462
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
480
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
504static int
505event_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
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
531 dbg("%s - re-enabling irq", __func__);
532 controller->ops->enable_irq();
533 }
534 out:
535 return 0;
536}
537
538
539static int
540poll_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
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
566static int
567cpci_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
581static void
582cpci_stop_thread(void)
583{
584 kthread_stop(cpci_thread);
585 thread_finished = 1;
586}
587
588int
589cpci_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
618static void
619cleanup_slots(void)
620{
621 struct slot *slot;
622 struct slot *tmp;
623
624
625
626
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 }
635cleanup_null:
636 up_write(&list_rwsem);
637 return;
638}
639
640int
641cpci_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
657int
658cpci_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
687 dbg("%s - enabling irq", __func__);
688 controller->ops->enable_irq();
689 }
690 dbg("%s - exit", __func__);
691 return 0;
692}
693
694int
695cpci_hp_stop(void)
696{
697 if (!controller)
698 return -ENODEV;
699 if (controller->irq) {
700
701 dbg("%s - disabling irq", __func__);
702 controller->ops->disable_irq();
703 }
704 cpci_stop_thread();
705 return 0;
706}
707
708int __init
709cpci_hotplug_init(int debug)
710{
711 cpci_debug = debug;
712 return 0;
713}
714
715void __exit
716cpci_hotplug_exit(void)
717{
718
719
720
721 cpci_hp_stop();
722 cpci_hp_unregister_controller(controller);
723}
724
725EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
726EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
727EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
728EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
729EXPORT_SYMBOL_GPL(cpci_hp_start);
730EXPORT_SYMBOL_GPL(cpci_hp_stop);
731
