Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * CompactPCI Hot Plug Driver | |
3 | * | |
bcc488ab | 4 | * Copyright (C) 2002,2005 SOMA Networks, Inc. |
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
43b7d7cf | 35 | #include <asm/atomic.h> |
1da177e4 LT |
36 | #include <linux/delay.h> |
37 | #include "pci_hotplug.h" | |
38 | #include "cpci_hotplug.h" | |
39 | ||
1da177e4 LT |
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 { \ | |
bcc488ab | 47 | if (cpci_debug) \ |
1da177e4 LT |
48 | printk (KERN_DEBUG "%s: " format "\n", \ |
49 | MY_NAME , ## arg); \ | |
bcc488ab | 50 | } while (0) |
1da177e4 LT |
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 */ | |
43b7d7cf | 56 | static DECLARE_RWSEM(list_rwsem); |
1da177e4 LT |
57 | static LIST_HEAD(slot_list); |
58 | static int slots; | |
43b7d7cf | 59 | static atomic_t extracting; |
1da177e4 LT |
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); | |
43b7d7cf SM |
71 | static int get_adapter_status(struct hotplug_slot *slot, u8 * value); |
72 | static int get_latch_status(struct hotplug_slot *slot, u8 * value); | |
1da177e4 LT |
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, | |
43b7d7cf SM |
81 | .get_adapter_status = get_adapter_status, |
82 | .get_latch_status = get_latch_status, | |
1da177e4 LT |
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 | ||
bcc488ab | 113 | if (controller->ops->set_power) |
1da177e4 | 114 | retval = controller->ops->set_power(slot, 1); |
1da177e4 LT |
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 | ||
bcc488ab SM |
126 | down_write(&list_rwsem); |
127 | ||
1da177e4 LT |
128 | /* Unconfigure device */ |
129 | dbg("%s - unconfiguring slot %s", | |
130 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 131 | if ((retval = cpci_unconfigure_slot(slot))) { |
1da177e4 LT |
132 | err("%s - could not unconfigure slot %s", |
133 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 134 | goto disable_error; |
1da177e4 LT |
135 | } |
136 | dbg("%s - finished unconfiguring slot %s", | |
137 | __FUNCTION__, slot->hotplug_slot->name); | |
138 | ||
139 | /* Clear EXT (by setting it) */ | |
bcc488ab | 140 | if (cpci_clear_ext(slot)) { |
1da177e4 LT |
141 | err("%s - could not clear EXT for slot %s", |
142 | __FUNCTION__, slot->hotplug_slot->name); | |
143 | retval = -ENODEV; | |
bcc488ab | 144 | goto disable_error; |
1da177e4 LT |
145 | } |
146 | cpci_led_on(slot); | |
147 | ||
bcc488ab SM |
148 | if (controller->ops->set_power) |
149 | if ((retval = controller->ops->set_power(slot, 0))) | |
150 | goto disable_error; | |
1da177e4 | 151 | |
bcc488ab | 152 | if (update_adapter_status(slot->hotplug_slot, 0)) |
1da177e4 | 153 | warn("failure to update adapter file"); |
1da177e4 | 154 | |
bcc488ab | 155 | if (slot->extracting) { |
43b7d7cf SM |
156 | slot->extracting = 0; |
157 | atomic_dec(&extracting); | |
158 | } | |
bcc488ab SM |
159 | disable_error: |
160 | up_write(&list_rwsem); | |
1da177e4 LT |
161 | return retval; |
162 | } | |
163 | ||
164 | static u8 | |
165 | cpci_get_power_status(struct slot *slot) | |
166 | { | |
167 | u8 power = 1; | |
168 | ||
bcc488ab | 169 | if (controller->ops->get_power) |
1da177e4 | 170 | power = controller->ops->get_power(slot); |
1da177e4 LT |
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 | ||
43b7d7cf SM |
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 | ||
1da177e4 LT |
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); | |
03e49d40 SM |
219 | if (slot->dev) |
220 | pci_dev_put(slot->dev); | |
1da177e4 LT |
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 | ||
bcc488ab | 242 | if (!(controller && bus)) |
1da177e4 | 243 | return -ENODEV; |
1da177e4 LT |
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) { | |
f5afe806 | 250 | slot = kzalloc(sizeof (struct slot), GFP_KERNEL); |
1da177e4 LT |
251 | if (!slot) |
252 | goto error; | |
1da177e4 LT |
253 | |
254 | hotplug_slot = | |
f5afe806 | 255 | kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL); |
1da177e4 LT |
256 | if (!hotplug_slot) |
257 | goto error_slot; | |
1da177e4 LT |
258 | slot->hotplug_slot = hotplug_slot; |
259 | ||
f5afe806 | 260 | info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); |
1da177e4 LT |
261 | if (!info) |
262 | goto error_hpslot; | |
1da177e4 LT |
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 */ | |
43b7d7cf | 295 | down_write(&list_rwsem); |
1da177e4 LT |
296 | list_add(&slot->slot_list, &slot_list); |
297 | slots++; | |
43b7d7cf | 298 | up_write(&list_rwsem); |
1da177e4 LT |
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; | |
bcc488ab SM |
317 | struct slot *tmp; |
318 | int status = 0; | |
1da177e4 | 319 | |
43b7d7cf | 320 | down_write(&list_rwsem); |
bcc488ab | 321 | if (!slots) { |
43b7d7cf | 322 | up_write(&list_rwsem); |
1da177e4 LT |
323 | return -1; |
324 | } | |
bcc488ab SM |
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 | ||
1da177e4 LT |
330 | dbg("deregistering slot %s", slot->hotplug_slot->name); |
331 | status = pci_hp_deregister(slot->hotplug_slot); | |
bcc488ab | 332 | if (status) { |
1da177e4 LT |
333 | err("pci_hp_deregister failed with error %d", |
334 | status); | |
bcc488ab | 335 | break; |
1da177e4 | 336 | } |
1da177e4 LT |
337 | } |
338 | } | |
43b7d7cf | 339 | up_write(&list_rwsem); |
bcc488ab | 340 | return status; |
1da177e4 LT |
341 | } |
342 | ||
343 | /* This is the interrupt mode interrupt handler */ | |
344 | static irqreturn_t | |
7d12e780 | 345 | cpci_hp_intr(int irq, void *data) |
1da177e4 LT |
346 | { |
347 | dbg("entered cpci_hp_intr"); | |
348 | ||
349 | /* Check to see if it was our interrupt */ | |
6b4486e2 | 350 | if ((controller->irq_flags & IRQF_SHARED) && |
1da177e4 LT |
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 | /* | |
43b7d7cf | 367 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
1da177e4 LT |
368 | * initialization, the system driver shall clear the |
369 | * INS bits of the cold-inserted devices. | |
370 | */ | |
371 | static int | |
bcc488ab | 372 | init_slots(int clear_ins) |
1da177e4 LT |
373 | { |
374 | struct slot *slot; | |
1da177e4 LT |
375 | struct pci_dev* dev; |
376 | ||
377 | dbg("%s - enter", __FUNCTION__); | |
43b7d7cf | 378 | down_read(&list_rwsem); |
bcc488ab | 379 | if (!slots) { |
43b7d7cf | 380 | up_read(&list_rwsem); |
1da177e4 LT |
381 | return -1; |
382 | } | |
bcc488ab | 383 | list_for_each_entry(slot, &slot_list, slot_list) { |
1da177e4 LT |
384 | dbg("%s - looking at slot %s", |
385 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 386 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
1da177e4 LT |
387 | dbg("%s - cleared INS for slot %s", |
388 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab SM |
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; | |
1da177e4 LT |
396 | } |
397 | } | |
43b7d7cf | 398 | up_read(&list_rwsem); |
1da177e4 LT |
399 | dbg("%s - exit", __FUNCTION__); |
400 | return 0; | |
401 | } | |
402 | ||
403 | static int | |
404 | check_slots(void) | |
405 | { | |
406 | struct slot *slot; | |
1da177e4 LT |
407 | int extracted; |
408 | int inserted; | |
43b7d7cf | 409 | u16 hs_csr; |
1da177e4 | 410 | |
43b7d7cf | 411 | down_read(&list_rwsem); |
bcc488ab | 412 | if (!slots) { |
43b7d7cf | 413 | up_read(&list_rwsem); |
1da177e4 LT |
414 | err("no slots registered, shutting down"); |
415 | return -1; | |
416 | } | |
417 | extracted = inserted = 0; | |
bcc488ab | 418 | list_for_each_entry(slot, &slot_list, slot_list) { |
1da177e4 LT |
419 | dbg("%s - looking at slot %s", |
420 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab SM |
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); | |
1da177e4 LT |
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); | |
bcc488ab | 445 | if (cpci_configure_slot(slot)) { |
1da177e4 LT |
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 | ||
bcc488ab | 458 | if (update_latch_status(slot->hotplug_slot, 1)) |
1da177e4 | 459 | warn("failure to update latch file"); |
1da177e4 | 460 | |
bcc488ab | 461 | if (update_adapter_status(slot->hotplug_slot, 1)) |
1da177e4 | 462 | warn("failure to update adapter file"); |
1da177e4 LT |
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++; | |
bcc488ab | 472 | } else if (cpci_check_ext(slot)) { |
1da177e4 LT |
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 | ||
bcc488ab SM |
482 | if (!slot->extracting) { |
483 | if (update_latch_status(slot->hotplug_slot, 0)) { | |
1da177e4 LT |
484 | warn("failure to update latch file"); |
485 | } | |
486 | slot->extracting = 1; | |
bcc488ab | 487 | atomic_inc(&extracting); |
1da177e4 LT |
488 | } |
489 | extracted++; | |
bcc488ab | 490 | } else if (slot->extracting) { |
43b7d7cf | 491 | hs_csr = cpci_get_hs_csr(slot); |
bcc488ab | 492 | if (hs_csr == 0xffff) { |
43b7d7cf SM |
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); | |
bcc488ab | 499 | if (update_adapter_status(slot->hotplug_slot, 0)) |
43b7d7cf | 500 | warn("failure to update adapter file"); |
43b7d7cf SM |
501 | slot->extracting = 0; |
502 | atomic_dec(&extracting); | |
503 | } | |
1da177e4 LT |
504 | } |
505 | } | |
43b7d7cf SM |
506 | up_read(&list_rwsem); |
507 | dbg("inserted=%d, extracted=%d, extracting=%d", | |
508 | inserted, extracted, atomic_read(&extracting)); | |
bcc488ab | 509 | if (inserted || extracted) |
1da177e4 | 510 | return extracted; |
bcc488ab | 511 | else if (!atomic_read(&extracting)) { |
1da177e4 LT |
512 | err("cannot find ENUM# source, shutting down"); |
513 | return -1; | |
514 | } | |
43b7d7cf | 515 | return 0; |
1da177e4 LT |
516 | } |
517 | ||
518 | /* This is the interrupt mode worker thread body */ | |
519 | static int | |
520 | event_thread(void *data) | |
521 | { | |
522 | int rc; | |
1da177e4 LT |
523 | |
524 | lock_kernel(); | |
525 | daemonize("cpci_hp_eventd"); | |
526 | unlock_kernel(); | |
527 | ||
528 | dbg("%s - event thread started", __FUNCTION__); | |
bcc488ab | 529 | while (1) { |
1da177e4 LT |
530 | dbg("event thread sleeping"); |
531 | down_interruptible(&event_semaphore); | |
532 | dbg("event thread woken, thread_finished = %d", | |
533 | thread_finished); | |
bcc488ab | 534 | if (thread_finished || signal_pending(current)) |
1da177e4 | 535 | break; |
43b7d7cf | 536 | do { |
1da177e4 | 537 | rc = check_slots(); |
43b7d7cf | 538 | if (rc > 0) { |
1da177e4 LT |
539 | /* Give userspace a chance to handle extraction */ |
540 | msleep(500); | |
43b7d7cf | 541 | } else if (rc < 0) { |
1da177e4 LT |
542 | dbg("%s - error checking slots", __FUNCTION__); |
543 | thread_finished = 1; | |
544 | break; | |
545 | } | |
bcc488ab SM |
546 | } while (atomic_read(&extracting) && !thread_finished); |
547 | if (thread_finished) | |
548 | break; | |
1da177e4 LT |
549 | |
550 | /* Re-enable ENUM# interrupt */ | |
551 | dbg("%s - re-enabling irq", __FUNCTION__); | |
552 | controller->ops->enable_irq(); | |
553 | } | |
1da177e4 LT |
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; | |
1da177e4 LT |
564 | |
565 | lock_kernel(); | |
566 | daemonize("cpci_hp_polld"); | |
567 | unlock_kernel(); | |
568 | ||
bcc488ab SM |
569 | while (1) { |
570 | if (thread_finished || signal_pending(current)) | |
1da177e4 | 571 | break; |
bcc488ab | 572 | if (controller->ops->query_enum()) { |
43b7d7cf SM |
573 | do { |
574 | rc = check_slots(); | |
bcc488ab | 575 | if (rc > 0) { |
43b7d7cf SM |
576 | /* Give userspace a chance to handle extraction */ |
577 | msleep(500); | |
bcc488ab | 578 | } else if (rc < 0) { |
43b7d7cf SM |
579 | dbg("%s - error checking slots", __FUNCTION__); |
580 | thread_finished = 1; | |
581 | break; | |
1da177e4 | 582 | } |
bcc488ab | 583 | } while (atomic_read(&extracting) && !thread_finished); |
1da177e4 | 584 | } |
1da177e4 LT |
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 | ||
bcc488ab | 602 | if (controller->irq) |
1da177e4 | 603 | pid = kernel_thread(event_thread, NULL, 0); |
bcc488ab | 604 | else |
1da177e4 | 605 | pid = kernel_thread(poll_thread, NULL, 0); |
bcc488ab | 606 | if (pid < 0) { |
1da177e4 LT |
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"); | |
bcc488ab | 619 | if (controller->irq) |
1da177e4 | 620 | up(&event_semaphore); |
1da177e4 LT |
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 | ||
bcc488ab SM |
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; | |
1da177e4 | 646 | } |
bcc488ab SM |
647 | dbg("%s - acquired controller irq %d", |
648 | __FUNCTION__, new_controller->irq); | |
1da177e4 | 649 | } |
bcc488ab SM |
650 | if (!status) |
651 | controller = new_controller; | |
1da177e4 LT |
652 | return status; |
653 | } | |
654 | ||
bcc488ab SM |
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 | ||
1da177e4 LT |
677 | int |
678 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
679 | { | |
680 | int status = 0; | |
681 | ||
bcc488ab SM |
682 | if (controller) { |
683 | if (!thread_finished) | |
1da177e4 | 684 | cpci_stop_thread(); |
bcc488ab | 685 | if (controller->irq) |
1da177e4 | 686 | free_irq(controller->irq, controller->dev_id); |
1da177e4 | 687 | controller = NULL; |
bcc488ab SM |
688 | cleanup_slots(); |
689 | } else | |
1da177e4 | 690 | status = -ENODEV; |
1da177e4 LT |
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__); | |
bcc488ab | 701 | if (!controller) |
1da177e4 | 702 | return -ENODEV; |
1da177e4 | 703 | |
43b7d7cf | 704 | down_read(&list_rwsem); |
bcc488ab | 705 | if (list_empty(&slot_list)) { |
43b7d7cf | 706 | up_read(&list_rwsem); |
1da177e4 LT |
707 | return -ENODEV; |
708 | } | |
43b7d7cf | 709 | up_read(&list_rwsem); |
1da177e4 | 710 | |
bcc488ab SM |
711 | status = init_slots(first); |
712 | if (first) | |
1da177e4 | 713 | first = 0; |
bcc488ab SM |
714 | if (status) |
715 | return status; | |
1da177e4 LT |
716 | |
717 | status = cpci_start_thread(); | |
bcc488ab | 718 | if (status) |
1da177e4 | 719 | return status; |
1da177e4 LT |
720 | dbg("%s - thread started", __FUNCTION__); |
721 | ||
bcc488ab | 722 | if (controller->irq) { |
1da177e4 LT |
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 | { | |
bcc488ab | 734 | if (!controller) |
1da177e4 | 735 | return -ENODEV; |
bcc488ab | 736 | if (controller->irq) { |
1da177e4 LT |
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 | ||
1da177e4 LT |
745 | int __init |
746 | cpci_hotplug_init(int debug) | |
747 | { | |
1da177e4 | 748 | cpci_debug = debug; |
1da177e4 LT |
749 | return 0; |
750 | } | |
751 | ||
752 | void __exit | |
753 | cpci_hotplug_exit(void) | |
754 | { | |
755 | /* | |
756 | * Clean everything up. | |
757 | */ | |
bcc488ab SM |
758 | cpci_hp_stop(); |
759 | cpci_hp_unregister_controller(controller); | |
1da177e4 LT |
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); |