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1da177e4 LT |
1 | /* |
2 | * CompactPCI Hot Plug Driver | |
3 | * | |
4 | * Copyright (C) 2002 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 <linux/delay.h> | |
37 | #include "pci_hotplug.h" | |
38 | #include "cpci_hotplug.h" | |
39 | ||
40 | #define DRIVER_VERSION "0.2" | |
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 spinlock_t list_lock; | |
58 | static LIST_HEAD(slot_list); | |
59 | static int slots; | |
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 | ||
72 | static struct hotplug_slot_ops cpci_hotplug_slot_ops = { | |
73 | .owner = THIS_MODULE, | |
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 | }; | |
80 | ||
81 | static int | |
82 | update_latch_status(struct hotplug_slot *hotplug_slot, u8 value) | |
83 | { | |
84 | struct hotplug_slot_info info; | |
85 | ||
86 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
87 | info.latch_status = value; | |
88 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
89 | } | |
90 | ||
91 | static int | |
92 | update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value) | |
93 | { | |
94 | struct hotplug_slot_info info; | |
95 | ||
96 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
97 | info.adapter_status = value; | |
98 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
99 | } | |
100 | ||
101 | static int | |
102 | enable_slot(struct hotplug_slot *hotplug_slot) | |
103 | { | |
104 | struct slot *slot = hotplug_slot->private; | |
105 | int retval = 0; | |
106 | ||
107 | dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name); | |
108 | ||
109 | if(controller->ops->set_power) { | |
110 | retval = controller->ops->set_power(slot, 1); | |
111 | } | |
112 | ||
113 | return retval; | |
114 | } | |
115 | ||
116 | static int | |
117 | disable_slot(struct hotplug_slot *hotplug_slot) | |
118 | { | |
119 | struct slot *slot = hotplug_slot->private; | |
120 | int retval = 0; | |
121 | ||
122 | dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name); | |
123 | ||
124 | /* Unconfigure device */ | |
125 | dbg("%s - unconfiguring slot %s", | |
126 | __FUNCTION__, slot->hotplug_slot->name); | |
127 | if((retval = cpci_unconfigure_slot(slot))) { | |
128 | err("%s - could not unconfigure slot %s", | |
129 | __FUNCTION__, slot->hotplug_slot->name); | |
130 | return retval; | |
131 | } | |
132 | dbg("%s - finished unconfiguring slot %s", | |
133 | __FUNCTION__, slot->hotplug_slot->name); | |
134 | ||
135 | /* Clear EXT (by setting it) */ | |
136 | if(cpci_clear_ext(slot)) { | |
137 | err("%s - could not clear EXT for slot %s", | |
138 | __FUNCTION__, slot->hotplug_slot->name); | |
139 | retval = -ENODEV; | |
140 | } | |
141 | cpci_led_on(slot); | |
142 | ||
143 | if(controller->ops->set_power) { | |
144 | retval = controller->ops->set_power(slot, 0); | |
145 | } | |
146 | ||
147 | if(update_adapter_status(slot->hotplug_slot, 0)) { | |
148 | warn("failure to update adapter file"); | |
149 | } | |
150 | ||
151 | slot->extracting = 0; | |
152 | ||
153 | return retval; | |
154 | } | |
155 | ||
156 | static u8 | |
157 | cpci_get_power_status(struct slot *slot) | |
158 | { | |
159 | u8 power = 1; | |
160 | ||
161 | if(controller->ops->get_power) { | |
162 | power = controller->ops->get_power(slot); | |
163 | } | |
164 | return power; | |
165 | } | |
166 | ||
167 | static int | |
168 | get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
169 | { | |
170 | struct slot *slot = hotplug_slot->private; | |
171 | ||
172 | *value = cpci_get_power_status(slot); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int | |
177 | get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
178 | { | |
179 | struct slot *slot = hotplug_slot->private; | |
180 | ||
181 | *value = cpci_get_attention_status(slot); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static int | |
186 | set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
187 | { | |
188 | return cpci_set_attention_status(hotplug_slot->private, status); | |
189 | } | |
190 | ||
191 | static void release_slot(struct hotplug_slot *hotplug_slot) | |
192 | { | |
193 | struct slot *slot = hotplug_slot->private; | |
194 | ||
195 | kfree(slot->hotplug_slot->info); | |
196 | kfree(slot->hotplug_slot->name); | |
197 | kfree(slot->hotplug_slot); | |
198 | kfree(slot); | |
199 | } | |
200 | ||
201 | #define SLOT_NAME_SIZE 6 | |
202 | static void | |
203 | make_slot_name(struct slot *slot) | |
204 | { | |
205 | snprintf(slot->hotplug_slot->name, | |
206 | SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number); | |
207 | } | |
208 | ||
209 | int | |
210 | cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) | |
211 | { | |
212 | struct slot *slot; | |
213 | struct hotplug_slot *hotplug_slot; | |
214 | struct hotplug_slot_info *info; | |
215 | char *name; | |
216 | int status = -ENOMEM; | |
217 | int i; | |
218 | ||
219 | if(!(controller && bus)) { | |
220 | return -ENODEV; | |
221 | } | |
222 | ||
223 | /* | |
224 | * Create a structure for each slot, and register that slot | |
225 | * with the pci_hotplug subsystem. | |
226 | */ | |
227 | for (i = first; i <= last; ++i) { | |
228 | slot = kmalloc(sizeof (struct slot), GFP_KERNEL); | |
229 | if (!slot) | |
230 | goto error; | |
231 | memset(slot, 0, sizeof (struct slot)); | |
232 | ||
233 | hotplug_slot = | |
234 | kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL); | |
235 | if (!hotplug_slot) | |
236 | goto error_slot; | |
237 | memset(hotplug_slot, 0, sizeof (struct hotplug_slot)); | |
238 | slot->hotplug_slot = hotplug_slot; | |
239 | ||
240 | info = kmalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); | |
241 | if (!info) | |
242 | goto error_hpslot; | |
243 | memset(info, 0, sizeof (struct hotplug_slot_info)); | |
244 | hotplug_slot->info = info; | |
245 | ||
246 | name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL); | |
247 | if (!name) | |
248 | goto error_info; | |
249 | hotplug_slot->name = name; | |
250 | ||
251 | slot->bus = bus; | |
252 | slot->number = i; | |
253 | slot->devfn = PCI_DEVFN(i, 0); | |
254 | ||
255 | hotplug_slot->private = slot; | |
256 | hotplug_slot->release = &release_slot; | |
257 | make_slot_name(slot); | |
258 | hotplug_slot->ops = &cpci_hotplug_slot_ops; | |
259 | ||
260 | /* | |
261 | * Initialize the slot info structure with some known | |
262 | * good values. | |
263 | */ | |
264 | dbg("initializing slot %s", slot->hotplug_slot->name); | |
265 | info->power_status = cpci_get_power_status(slot); | |
266 | info->attention_status = cpci_get_attention_status(slot); | |
267 | ||
268 | dbg("registering slot %s", slot->hotplug_slot->name); | |
269 | status = pci_hp_register(slot->hotplug_slot); | |
270 | if (status) { | |
271 | err("pci_hp_register failed with error %d", status); | |
272 | goto error_name; | |
273 | } | |
274 | ||
275 | /* Add slot to our internal list */ | |
276 | spin_lock(&list_lock); | |
277 | list_add(&slot->slot_list, &slot_list); | |
278 | slots++; | |
279 | spin_unlock(&list_lock); | |
280 | } | |
281 | return 0; | |
282 | error_name: | |
283 | kfree(name); | |
284 | error_info: | |
285 | kfree(info); | |
286 | error_hpslot: | |
287 | kfree(hotplug_slot); | |
288 | error_slot: | |
289 | kfree(slot); | |
290 | error: | |
291 | return status; | |
292 | } | |
293 | ||
294 | int | |
295 | cpci_hp_unregister_bus(struct pci_bus *bus) | |
296 | { | |
297 | struct slot *slot; | |
298 | struct list_head *tmp; | |
299 | struct list_head *next; | |
300 | int status; | |
301 | ||
302 | spin_lock(&list_lock); | |
303 | if(!slots) { | |
304 | spin_unlock(&list_lock); | |
305 | return -1; | |
306 | } | |
307 | list_for_each_safe(tmp, next, &slot_list) { | |
308 | slot = list_entry(tmp, struct slot, slot_list); | |
309 | if(slot->bus == bus) { | |
310 | dbg("deregistering slot %s", slot->hotplug_slot->name); | |
311 | status = pci_hp_deregister(slot->hotplug_slot); | |
312 | if(status) { | |
313 | err("pci_hp_deregister failed with error %d", | |
314 | status); | |
315 | return status; | |
316 | } | |
317 | ||
318 | list_del(&slot->slot_list); | |
319 | slots--; | |
320 | } | |
321 | } | |
322 | spin_unlock(&list_lock); | |
323 | return 0; | |
324 | } | |
325 | ||
326 | /* This is the interrupt mode interrupt handler */ | |
327 | static irqreturn_t | |
328 | cpci_hp_intr(int irq, void *data, struct pt_regs *regs) | |
329 | { | |
330 | dbg("entered cpci_hp_intr"); | |
331 | ||
332 | /* Check to see if it was our interrupt */ | |
333 | if((controller->irq_flags & SA_SHIRQ) && | |
334 | !controller->ops->check_irq(controller->dev_id)) { | |
335 | dbg("exited cpci_hp_intr, not our interrupt"); | |
336 | return IRQ_NONE; | |
337 | } | |
338 | ||
339 | /* Disable ENUM interrupt */ | |
340 | controller->ops->disable_irq(); | |
341 | ||
342 | /* Trigger processing by the event thread */ | |
343 | dbg("Signal event_semaphore"); | |
344 | up(&event_semaphore); | |
345 | dbg("exited cpci_hp_intr"); | |
346 | return IRQ_HANDLED; | |
347 | } | |
348 | ||
349 | /* | |
350 | * According to PICMG 2.12 R2.0, section 6.3.2, upon | |
351 | * initialization, the system driver shall clear the | |
352 | * INS bits of the cold-inserted devices. | |
353 | */ | |
354 | static int | |
355 | init_slots(void) | |
356 | { | |
357 | struct slot *slot; | |
358 | struct list_head *tmp; | |
359 | struct pci_dev* dev; | |
360 | ||
361 | dbg("%s - enter", __FUNCTION__); | |
362 | spin_lock(&list_lock); | |
363 | if(!slots) { | |
364 | spin_unlock(&list_lock); | |
365 | return -1; | |
366 | } | |
367 | list_for_each(tmp, &slot_list) { | |
368 | slot = list_entry(tmp, struct slot, slot_list); | |
369 | dbg("%s - looking at slot %s", | |
370 | __FUNCTION__, slot->hotplug_slot->name); | |
371 | if(cpci_check_and_clear_ins(slot)) { | |
372 | dbg("%s - cleared INS for slot %s", | |
373 | __FUNCTION__, slot->hotplug_slot->name); | |
374 | dev = pci_find_slot(slot->bus->number, PCI_DEVFN(slot->number, 0)); | |
375 | if(dev) { | |
376 | if(update_adapter_status(slot->hotplug_slot, 1)) { | |
377 | warn("failure to update adapter file"); | |
378 | } | |
379 | if(update_latch_status(slot->hotplug_slot, 1)) { | |
380 | warn("failure to update latch file"); | |
381 | } | |
382 | slot->dev = dev; | |
383 | } else { | |
384 | err("%s - no driver attached to device in slot %s", | |
385 | __FUNCTION__, slot->hotplug_slot->name); | |
386 | } | |
387 | } | |
388 | } | |
389 | spin_unlock(&list_lock); | |
390 | dbg("%s - exit", __FUNCTION__); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | static int | |
395 | check_slots(void) | |
396 | { | |
397 | struct slot *slot; | |
398 | struct list_head *tmp; | |
399 | int extracted; | |
400 | int inserted; | |
401 | ||
402 | spin_lock(&list_lock); | |
403 | if(!slots) { | |
404 | spin_unlock(&list_lock); | |
405 | err("no slots registered, shutting down"); | |
406 | return -1; | |
407 | } | |
408 | extracted = inserted = 0; | |
409 | list_for_each(tmp, &slot_list) { | |
410 | slot = list_entry(tmp, struct slot, slot_list); | |
411 | dbg("%s - looking at slot %s", | |
412 | __FUNCTION__, slot->hotplug_slot->name); | |
413 | if(cpci_check_and_clear_ins(slot)) { | |
414 | u16 hs_csr; | |
415 | ||
416 | /* Some broken hardware (e.g. PLX 9054AB) asserts ENUM# twice... */ | |
417 | if(slot->dev) { | |
418 | warn("slot %s already inserted", slot->hotplug_slot->name); | |
419 | inserted++; | |
420 | continue; | |
421 | } | |
422 | ||
423 | /* Process insertion */ | |
424 | dbg("%s - slot %s inserted", | |
425 | __FUNCTION__, slot->hotplug_slot->name); | |
426 | ||
427 | /* GSM, debug */ | |
428 | hs_csr = cpci_get_hs_csr(slot); | |
429 | dbg("%s - slot %s HS_CSR (1) = %04x", | |
430 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
431 | ||
432 | /* Configure device */ | |
433 | dbg("%s - configuring slot %s", | |
434 | __FUNCTION__, slot->hotplug_slot->name); | |
435 | if(cpci_configure_slot(slot)) { | |
436 | err("%s - could not configure slot %s", | |
437 | __FUNCTION__, slot->hotplug_slot->name); | |
438 | continue; | |
439 | } | |
440 | dbg("%s - finished configuring slot %s", | |
441 | __FUNCTION__, slot->hotplug_slot->name); | |
442 | ||
443 | /* GSM, debug */ | |
444 | hs_csr = cpci_get_hs_csr(slot); | |
445 | dbg("%s - slot %s HS_CSR (2) = %04x", | |
446 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
447 | ||
448 | if(update_latch_status(slot->hotplug_slot, 1)) { | |
449 | warn("failure to update latch file"); | |
450 | } | |
451 | ||
452 | if(update_adapter_status(slot->hotplug_slot, 1)) { | |
453 | warn("failure to update adapter file"); | |
454 | } | |
455 | ||
456 | cpci_led_off(slot); | |
457 | ||
458 | /* GSM, debug */ | |
459 | hs_csr = cpci_get_hs_csr(slot); | |
460 | dbg("%s - slot %s HS_CSR (3) = %04x", | |
461 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
462 | ||
463 | inserted++; | |
464 | } else if(cpci_check_ext(slot)) { | |
465 | u16 hs_csr; | |
466 | ||
467 | /* Process extraction request */ | |
468 | dbg("%s - slot %s extracted", | |
469 | __FUNCTION__, slot->hotplug_slot->name); | |
470 | ||
471 | /* GSM, debug */ | |
472 | hs_csr = cpci_get_hs_csr(slot); | |
473 | dbg("%s - slot %s HS_CSR = %04x", | |
474 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
475 | ||
476 | if(!slot->extracting) { | |
477 | if(update_latch_status(slot->hotplug_slot, 0)) { | |
478 | warn("failure to update latch file"); | |
479 | } | |
480 | slot->extracting = 1; | |
481 | } | |
482 | extracted++; | |
483 | } | |
484 | } | |
485 | spin_unlock(&list_lock); | |
486 | if(inserted || extracted) { | |
487 | return extracted; | |
488 | } | |
489 | else { | |
490 | err("cannot find ENUM# source, shutting down"); | |
491 | return -1; | |
492 | } | |
493 | } | |
494 | ||
495 | /* This is the interrupt mode worker thread body */ | |
496 | static int | |
497 | event_thread(void *data) | |
498 | { | |
499 | int rc; | |
500 | struct slot *slot; | |
501 | struct list_head *tmp; | |
502 | ||
503 | lock_kernel(); | |
504 | daemonize("cpci_hp_eventd"); | |
505 | unlock_kernel(); | |
506 | ||
507 | dbg("%s - event thread started", __FUNCTION__); | |
508 | while(1) { | |
509 | dbg("event thread sleeping"); | |
510 | down_interruptible(&event_semaphore); | |
511 | dbg("event thread woken, thread_finished = %d", | |
512 | thread_finished); | |
513 | if(thread_finished || signal_pending(current)) | |
514 | break; | |
515 | while(controller->ops->query_enum()) { | |
516 | rc = check_slots(); | |
517 | if (rc > 0) | |
518 | /* Give userspace a chance to handle extraction */ | |
519 | msleep(500); | |
520 | else if (rc < 0) { | |
521 | dbg("%s - error checking slots", __FUNCTION__); | |
522 | thread_finished = 1; | |
523 | break; | |
524 | } | |
525 | } | |
526 | /* Check for someone yanking out a board */ | |
527 | list_for_each(tmp, &slot_list) { | |
528 | slot = list_entry(tmp, struct slot, slot_list); | |
529 | if(slot->extracting) { | |
530 | /* | |
531 | * Hmmm, we're likely hosed at this point, should we | |
532 | * bother trying to tell the driver or not? | |
533 | */ | |
534 | err("card in slot %s was improperly removed", | |
535 | slot->hotplug_slot->name); | |
536 | if(update_adapter_status(slot->hotplug_slot, 0)) { | |
537 | warn("failure to update adapter file"); | |
538 | } | |
539 | slot->extracting = 0; | |
540 | } | |
541 | } | |
542 | ||
543 | /* Re-enable ENUM# interrupt */ | |
544 | dbg("%s - re-enabling irq", __FUNCTION__); | |
545 | controller->ops->enable_irq(); | |
546 | } | |
547 | ||
548 | dbg("%s - event thread signals exit", __FUNCTION__); | |
549 | up(&thread_exit); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | /* This is the polling mode worker thread body */ | |
554 | static int | |
555 | poll_thread(void *data) | |
556 | { | |
557 | int rc; | |
558 | struct slot *slot; | |
559 | struct list_head *tmp; | |
560 | ||
561 | lock_kernel(); | |
562 | daemonize("cpci_hp_polld"); | |
563 | unlock_kernel(); | |
564 | ||
565 | while(1) { | |
566 | if(thread_finished || signal_pending(current)) | |
567 | break; | |
568 | ||
569 | while(controller->ops->query_enum()) { | |
570 | rc = check_slots(); | |
571 | if(rc > 0) | |
572 | /* Give userspace a chance to handle extraction */ | |
573 | msleep(500); | |
574 | else if (rc < 0) { | |
575 | dbg("%s - error checking slots", __FUNCTION__); | |
576 | thread_finished = 1; | |
577 | break; | |
578 | } | |
579 | } | |
580 | /* Check for someone yanking out a board */ | |
581 | list_for_each(tmp, &slot_list) { | |
582 | slot = list_entry(tmp, struct slot, slot_list); | |
583 | if(slot->extracting) { | |
584 | /* | |
585 | * Hmmm, we're likely hosed at this point, should we | |
586 | * bother trying to tell the driver or not? | |
587 | */ | |
588 | err("card in slot %s was improperly removed", | |
589 | slot->hotplug_slot->name); | |
590 | if(update_adapter_status(slot->hotplug_slot, 0)) { | |
591 | warn("failure to update adapter file"); | |
592 | } | |
593 | slot->extracting = 0; | |
594 | } | |
595 | } | |
596 | ||
597 | msleep(100); | |
598 | } | |
599 | dbg("poll thread signals exit"); | |
600 | up(&thread_exit); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static int | |
605 | cpci_start_thread(void) | |
606 | { | |
607 | int pid; | |
608 | ||
609 | /* initialize our semaphores */ | |
610 | init_MUTEX_LOCKED(&event_semaphore); | |
611 | init_MUTEX_LOCKED(&thread_exit); | |
612 | thread_finished = 0; | |
613 | ||
614 | if(controller->irq) { | |
615 | pid = kernel_thread(event_thread, NULL, 0); | |
616 | } else { | |
617 | pid = kernel_thread(poll_thread, NULL, 0); | |
618 | } | |
619 | if(pid < 0) { | |
620 | err("Can't start up our thread"); | |
621 | return -1; | |
622 | } | |
623 | dbg("Our thread pid = %d", pid); | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static void | |
628 | cpci_stop_thread(void) | |
629 | { | |
630 | thread_finished = 1; | |
631 | dbg("thread finish command given"); | |
632 | if(controller->irq) { | |
633 | up(&event_semaphore); | |
634 | } | |
635 | dbg("wait for thread to exit"); | |
636 | down(&thread_exit); | |
637 | } | |
638 | ||
639 | int | |
640 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) | |
641 | { | |
642 | int status = 0; | |
643 | ||
644 | if(!controller) { | |
645 | controller = new_controller; | |
646 | if(controller->irq) { | |
647 | if(request_irq(controller->irq, | |
648 | cpci_hp_intr, | |
649 | controller->irq_flags, | |
650 | MY_NAME, controller->dev_id)) { | |
651 | err("Can't get irq %d for the hotplug cPCI controller", controller->irq); | |
652 | status = -ENODEV; | |
653 | } | |
654 | dbg("%s - acquired controller irq %d", __FUNCTION__, | |
655 | controller->irq); | |
656 | } | |
657 | } else { | |
658 | err("cPCI hotplug controller already registered"); | |
659 | status = -1; | |
660 | } | |
661 | return status; | |
662 | } | |
663 | ||
664 | int | |
665 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
666 | { | |
667 | int status = 0; | |
668 | ||
669 | if(controller) { | |
670 | if(!thread_finished) { | |
671 | cpci_stop_thread(); | |
672 | } | |
673 | if(controller->irq) { | |
674 | free_irq(controller->irq, controller->dev_id); | |
675 | } | |
676 | controller = NULL; | |
677 | } else { | |
678 | status = -ENODEV; | |
679 | } | |
680 | return status; | |
681 | } | |
682 | ||
683 | int | |
684 | cpci_hp_start(void) | |
685 | { | |
686 | static int first = 1; | |
687 | int status; | |
688 | ||
689 | dbg("%s - enter", __FUNCTION__); | |
690 | if(!controller) { | |
691 | return -ENODEV; | |
692 | } | |
693 | ||
694 | spin_lock(&list_lock); | |
695 | if(!slots) { | |
696 | spin_unlock(&list_lock); | |
697 | return -ENODEV; | |
698 | } | |
699 | spin_unlock(&list_lock); | |
700 | ||
701 | if(first) { | |
702 | status = init_slots(); | |
703 | if(status) { | |
704 | return status; | |
705 | } | |
706 | first = 0; | |
707 | } | |
708 | ||
709 | status = cpci_start_thread(); | |
710 | if(status) { | |
711 | return status; | |
712 | } | |
713 | dbg("%s - thread started", __FUNCTION__); | |
714 | ||
715 | if(controller->irq) { | |
716 | /* Start enum interrupt processing */ | |
717 | dbg("%s - enabling irq", __FUNCTION__); | |
718 | controller->ops->enable_irq(); | |
719 | } | |
720 | dbg("%s - exit", __FUNCTION__); | |
721 | return 0; | |
722 | } | |
723 | ||
724 | int | |
725 | cpci_hp_stop(void) | |
726 | { | |
727 | if(!controller) { | |
728 | return -ENODEV; | |
729 | } | |
730 | ||
731 | if(controller->irq) { | |
732 | /* Stop enum interrupt processing */ | |
733 | dbg("%s - disabling irq", __FUNCTION__); | |
734 | controller->ops->disable_irq(); | |
735 | } | |
736 | cpci_stop_thread(); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | static void __exit | |
741 | cleanup_slots(void) | |
742 | { | |
743 | struct list_head *tmp; | |
744 | struct slot *slot; | |
745 | ||
746 | /* | |
747 | * Unregister all of our slots with the pci_hotplug subsystem, | |
748 | * and free up all memory that we had allocated. | |
749 | */ | |
750 | spin_lock(&list_lock); | |
751 | if(!slots) { | |
752 | goto null_cleanup; | |
753 | } | |
754 | list_for_each(tmp, &slot_list) { | |
755 | slot = list_entry(tmp, struct slot, slot_list); | |
756 | list_del(&slot->slot_list); | |
757 | pci_hp_deregister(slot->hotplug_slot); | |
758 | kfree(slot->hotplug_slot->info); | |
759 | kfree(slot->hotplug_slot->name); | |
760 | kfree(slot->hotplug_slot); | |
761 | kfree(slot); | |
762 | } | |
763 | null_cleanup: | |
764 | spin_unlock(&list_lock); | |
765 | return; | |
766 | } | |
767 | ||
768 | int __init | |
769 | cpci_hotplug_init(int debug) | |
770 | { | |
771 | spin_lock_init(&list_lock); | |
772 | cpci_debug = debug; | |
773 | ||
774 | info(DRIVER_DESC " version: " DRIVER_VERSION); | |
775 | return 0; | |
776 | } | |
777 | ||
778 | void __exit | |
779 | cpci_hotplug_exit(void) | |
780 | { | |
781 | /* | |
782 | * Clean everything up. | |
783 | */ | |
784 | cleanup_slots(); | |
785 | } | |
786 | ||
787 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); | |
788 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); | |
789 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); | |
790 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); | |
791 | EXPORT_SYMBOL_GPL(cpci_hp_start); | |
792 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |