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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 | ||
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> | |
43b7d7cf | 36 | #include <asm/atomic.h> |
1da177e4 LT |
37 | #include <linux/delay.h> |
38 | #include "pci_hotplug.h" | |
39 | #include "cpci_hotplug.h" | |
40 | ||
1da177e4 LT |
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 { \ | |
bcc488ab | 48 | if (cpci_debug) \ |
1da177e4 LT |
49 | printk (KERN_DEBUG "%s: " format "\n", \ |
50 | MY_NAME , ## arg); \ | |
bcc488ab | 51 | } while (0) |
1da177e4 LT |
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 */ | |
43b7d7cf | 57 | static DECLARE_RWSEM(list_rwsem); |
1da177e4 LT |
58 | static LIST_HEAD(slot_list); |
59 | static int slots; | |
43b7d7cf | 60 | static atomic_t extracting; |
1da177e4 LT |
61 | int cpci_debug; |
62 | static struct cpci_hp_controller *controller; | |
63 | static struct semaphore event_semaphore; /* mutex for process loop (up if something to process) */ | |
64 | static struct semaphore thread_exit; /* guard ensure thread has exited before calling it quits */ | |
65 | static int thread_finished = 1; | |
66 | ||
67 | static int enable_slot(struct hotplug_slot *slot); | |
68 | static int disable_slot(struct hotplug_slot *slot); | |
69 | static int set_attention_status(struct hotplug_slot *slot, u8 value); | |
70 | static int get_power_status(struct hotplug_slot *slot, u8 * value); | |
71 | static int get_attention_status(struct hotplug_slot *slot, u8 * value); | |
43b7d7cf SM |
72 | static int get_adapter_status(struct hotplug_slot *slot, u8 * value); |
73 | static int get_latch_status(struct hotplug_slot *slot, u8 * value); | |
1da177e4 LT |
74 | |
75 | static struct hotplug_slot_ops cpci_hotplug_slot_ops = { | |
76 | .owner = THIS_MODULE, | |
77 | .enable_slot = enable_slot, | |
78 | .disable_slot = disable_slot, | |
79 | .set_attention_status = set_attention_status, | |
80 | .get_power_status = get_power_status, | |
81 | .get_attention_status = get_attention_status, | |
43b7d7cf SM |
82 | .get_adapter_status = get_adapter_status, |
83 | .get_latch_status = get_latch_status, | |
1da177e4 LT |
84 | }; |
85 | ||
86 | static int | |
87 | update_latch_status(struct hotplug_slot *hotplug_slot, u8 value) | |
88 | { | |
89 | struct hotplug_slot_info info; | |
90 | ||
91 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
92 | info.latch_status = value; | |
93 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
94 | } | |
95 | ||
96 | static int | |
97 | update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value) | |
98 | { | |
99 | struct hotplug_slot_info info; | |
100 | ||
101 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
102 | info.adapter_status = value; | |
103 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
104 | } | |
105 | ||
106 | static int | |
107 | enable_slot(struct hotplug_slot *hotplug_slot) | |
108 | { | |
109 | struct slot *slot = hotplug_slot->private; | |
110 | int retval = 0; | |
111 | ||
112 | dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name); | |
113 | ||
bcc488ab | 114 | if (controller->ops->set_power) |
1da177e4 | 115 | retval = controller->ops->set_power(slot, 1); |
1da177e4 LT |
116 | return retval; |
117 | } | |
118 | ||
119 | static int | |
120 | disable_slot(struct hotplug_slot *hotplug_slot) | |
121 | { | |
122 | struct slot *slot = hotplug_slot->private; | |
123 | int retval = 0; | |
124 | ||
125 | dbg("%s - physical_slot = %s", __FUNCTION__, hotplug_slot->name); | |
126 | ||
bcc488ab SM |
127 | down_write(&list_rwsem); |
128 | ||
1da177e4 LT |
129 | /* Unconfigure device */ |
130 | dbg("%s - unconfiguring slot %s", | |
131 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 132 | if ((retval = cpci_unconfigure_slot(slot))) { |
1da177e4 LT |
133 | err("%s - could not unconfigure slot %s", |
134 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 135 | goto disable_error; |
1da177e4 LT |
136 | } |
137 | dbg("%s - finished unconfiguring slot %s", | |
138 | __FUNCTION__, slot->hotplug_slot->name); | |
139 | ||
140 | /* Clear EXT (by setting it) */ | |
bcc488ab | 141 | if (cpci_clear_ext(slot)) { |
1da177e4 LT |
142 | err("%s - could not clear EXT for slot %s", |
143 | __FUNCTION__, slot->hotplug_slot->name); | |
144 | retval = -ENODEV; | |
bcc488ab | 145 | goto disable_error; |
1da177e4 LT |
146 | } |
147 | cpci_led_on(slot); | |
148 | ||
bcc488ab SM |
149 | if (controller->ops->set_power) |
150 | if ((retval = controller->ops->set_power(slot, 0))) | |
151 | goto disable_error; | |
1da177e4 | 152 | |
bcc488ab | 153 | if (update_adapter_status(slot->hotplug_slot, 0)) |
1da177e4 | 154 | warn("failure to update adapter file"); |
1da177e4 | 155 | |
bcc488ab | 156 | if (slot->extracting) { |
43b7d7cf SM |
157 | slot->extracting = 0; |
158 | atomic_dec(&extracting); | |
159 | } | |
bcc488ab SM |
160 | disable_error: |
161 | up_write(&list_rwsem); | |
1da177e4 LT |
162 | return retval; |
163 | } | |
164 | ||
165 | static u8 | |
166 | cpci_get_power_status(struct slot *slot) | |
167 | { | |
168 | u8 power = 1; | |
169 | ||
bcc488ab | 170 | if (controller->ops->get_power) |
1da177e4 | 171 | power = controller->ops->get_power(slot); |
1da177e4 LT |
172 | return power; |
173 | } | |
174 | ||
175 | static int | |
176 | get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
177 | { | |
178 | struct slot *slot = hotplug_slot->private; | |
179 | ||
180 | *value = cpci_get_power_status(slot); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int | |
185 | get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
186 | { | |
187 | struct slot *slot = hotplug_slot->private; | |
188 | ||
189 | *value = cpci_get_attention_status(slot); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int | |
194 | set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
195 | { | |
196 | return cpci_set_attention_status(hotplug_slot->private, status); | |
197 | } | |
198 | ||
43b7d7cf SM |
199 | static int |
200 | get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
201 | { | |
202 | *value = hotplug_slot->info->adapter_status; | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int | |
207 | get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
208 | { | |
209 | *value = hotplug_slot->info->latch_status; | |
210 | return 0; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | static void release_slot(struct hotplug_slot *hotplug_slot) |
214 | { | |
215 | struct slot *slot = hotplug_slot->private; | |
216 | ||
217 | kfree(slot->hotplug_slot->info); | |
218 | kfree(slot->hotplug_slot->name); | |
219 | kfree(slot->hotplug_slot); | |
03e49d40 SM |
220 | if (slot->dev) |
221 | pci_dev_put(slot->dev); | |
1da177e4 LT |
222 | kfree(slot); |
223 | } | |
224 | ||
225 | #define SLOT_NAME_SIZE 6 | |
226 | static void | |
227 | make_slot_name(struct slot *slot) | |
228 | { | |
229 | snprintf(slot->hotplug_slot->name, | |
230 | SLOT_NAME_SIZE, "%02x:%02x", slot->bus->number, slot->number); | |
231 | } | |
232 | ||
233 | int | |
234 | cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) | |
235 | { | |
236 | struct slot *slot; | |
237 | struct hotplug_slot *hotplug_slot; | |
238 | struct hotplug_slot_info *info; | |
239 | char *name; | |
240 | int status = -ENOMEM; | |
241 | int i; | |
242 | ||
bcc488ab | 243 | if (!(controller && bus)) |
1da177e4 | 244 | return -ENODEV; |
1da177e4 LT |
245 | |
246 | /* | |
247 | * Create a structure for each slot, and register that slot | |
248 | * with the pci_hotplug subsystem. | |
249 | */ | |
250 | for (i = first; i <= last; ++i) { | |
251 | slot = kmalloc(sizeof (struct slot), GFP_KERNEL); | |
252 | if (!slot) | |
253 | goto error; | |
254 | memset(slot, 0, sizeof (struct slot)); | |
255 | ||
256 | hotplug_slot = | |
257 | kmalloc(sizeof (struct hotplug_slot), GFP_KERNEL); | |
258 | if (!hotplug_slot) | |
259 | goto error_slot; | |
260 | memset(hotplug_slot, 0, sizeof (struct hotplug_slot)); | |
261 | slot->hotplug_slot = hotplug_slot; | |
262 | ||
263 | info = kmalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); | |
264 | if (!info) | |
265 | goto error_hpslot; | |
266 | memset(info, 0, sizeof (struct hotplug_slot_info)); | |
267 | hotplug_slot->info = info; | |
268 | ||
269 | name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL); | |
270 | if (!name) | |
271 | goto error_info; | |
272 | hotplug_slot->name = name; | |
273 | ||
274 | slot->bus = bus; | |
275 | slot->number = i; | |
276 | slot->devfn = PCI_DEVFN(i, 0); | |
277 | ||
278 | hotplug_slot->private = slot; | |
279 | hotplug_slot->release = &release_slot; | |
280 | make_slot_name(slot); | |
281 | hotplug_slot->ops = &cpci_hotplug_slot_ops; | |
282 | ||
283 | /* | |
284 | * Initialize the slot info structure with some known | |
285 | * good values. | |
286 | */ | |
287 | dbg("initializing slot %s", slot->hotplug_slot->name); | |
288 | info->power_status = cpci_get_power_status(slot); | |
289 | info->attention_status = cpci_get_attention_status(slot); | |
290 | ||
291 | dbg("registering slot %s", slot->hotplug_slot->name); | |
292 | status = pci_hp_register(slot->hotplug_slot); | |
293 | if (status) { | |
294 | err("pci_hp_register failed with error %d", status); | |
295 | goto error_name; | |
296 | } | |
297 | ||
298 | /* Add slot to our internal list */ | |
43b7d7cf | 299 | down_write(&list_rwsem); |
1da177e4 LT |
300 | list_add(&slot->slot_list, &slot_list); |
301 | slots++; | |
43b7d7cf | 302 | up_write(&list_rwsem); |
1da177e4 LT |
303 | } |
304 | return 0; | |
305 | error_name: | |
306 | kfree(name); | |
307 | error_info: | |
308 | kfree(info); | |
309 | error_hpslot: | |
310 | kfree(hotplug_slot); | |
311 | error_slot: | |
312 | kfree(slot); | |
313 | error: | |
314 | return status; | |
315 | } | |
316 | ||
317 | int | |
318 | cpci_hp_unregister_bus(struct pci_bus *bus) | |
319 | { | |
320 | struct slot *slot; | |
bcc488ab SM |
321 | struct slot *tmp; |
322 | int status = 0; | |
1da177e4 | 323 | |
43b7d7cf | 324 | down_write(&list_rwsem); |
bcc488ab | 325 | if (!slots) { |
43b7d7cf | 326 | up_write(&list_rwsem); |
1da177e4 LT |
327 | return -1; |
328 | } | |
bcc488ab SM |
329 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { |
330 | if (slot->bus == bus) { | |
331 | list_del(&slot->slot_list); | |
332 | slots--; | |
333 | ||
1da177e4 LT |
334 | dbg("deregistering slot %s", slot->hotplug_slot->name); |
335 | status = pci_hp_deregister(slot->hotplug_slot); | |
bcc488ab | 336 | if (status) { |
1da177e4 LT |
337 | err("pci_hp_deregister failed with error %d", |
338 | status); | |
bcc488ab | 339 | break; |
1da177e4 | 340 | } |
1da177e4 LT |
341 | } |
342 | } | |
43b7d7cf | 343 | up_write(&list_rwsem); |
bcc488ab | 344 | return status; |
1da177e4 LT |
345 | } |
346 | ||
347 | /* This is the interrupt mode interrupt handler */ | |
348 | static irqreturn_t | |
349 | cpci_hp_intr(int irq, void *data, struct pt_regs *regs) | |
350 | { | |
351 | dbg("entered cpci_hp_intr"); | |
352 | ||
353 | /* Check to see if it was our interrupt */ | |
bcc488ab | 354 | if ((controller->irq_flags & SA_SHIRQ) && |
1da177e4 LT |
355 | !controller->ops->check_irq(controller->dev_id)) { |
356 | dbg("exited cpci_hp_intr, not our interrupt"); | |
357 | return IRQ_NONE; | |
358 | } | |
359 | ||
360 | /* Disable ENUM interrupt */ | |
361 | controller->ops->disable_irq(); | |
362 | ||
363 | /* Trigger processing by the event thread */ | |
364 | dbg("Signal event_semaphore"); | |
365 | up(&event_semaphore); | |
366 | dbg("exited cpci_hp_intr"); | |
367 | return IRQ_HANDLED; | |
368 | } | |
369 | ||
370 | /* | |
43b7d7cf | 371 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
1da177e4 LT |
372 | * initialization, the system driver shall clear the |
373 | * INS bits of the cold-inserted devices. | |
374 | */ | |
375 | static int | |
bcc488ab | 376 | init_slots(int clear_ins) |
1da177e4 LT |
377 | { |
378 | struct slot *slot; | |
1da177e4 LT |
379 | struct pci_dev* dev; |
380 | ||
381 | dbg("%s - enter", __FUNCTION__); | |
43b7d7cf | 382 | down_read(&list_rwsem); |
bcc488ab | 383 | if (!slots) { |
43b7d7cf | 384 | up_read(&list_rwsem); |
1da177e4 LT |
385 | return -1; |
386 | } | |
bcc488ab | 387 | list_for_each_entry(slot, &slot_list, slot_list) { |
1da177e4 LT |
388 | dbg("%s - looking at slot %s", |
389 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 390 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
1da177e4 LT |
391 | dbg("%s - cleared INS for slot %s", |
392 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab SM |
393 | dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0)); |
394 | if (dev) { | |
395 | if (update_adapter_status(slot->hotplug_slot, 1)) | |
396 | warn("failure to update adapter file"); | |
397 | if (update_latch_status(slot->hotplug_slot, 1)) | |
398 | warn("failure to update latch file"); | |
399 | slot->dev = dev; | |
1da177e4 LT |
400 | } |
401 | } | |
43b7d7cf | 402 | up_read(&list_rwsem); |
1da177e4 LT |
403 | dbg("%s - exit", __FUNCTION__); |
404 | return 0; | |
405 | } | |
406 | ||
407 | static int | |
408 | check_slots(void) | |
409 | { | |
410 | struct slot *slot; | |
1da177e4 LT |
411 | int extracted; |
412 | int inserted; | |
43b7d7cf | 413 | u16 hs_csr; |
1da177e4 | 414 | |
43b7d7cf | 415 | down_read(&list_rwsem); |
bcc488ab | 416 | if (!slots) { |
43b7d7cf | 417 | up_read(&list_rwsem); |
1da177e4 LT |
418 | err("no slots registered, shutting down"); |
419 | return -1; | |
420 | } | |
421 | extracted = inserted = 0; | |
bcc488ab | 422 | list_for_each_entry(slot, &slot_list, slot_list) { |
1da177e4 LT |
423 | dbg("%s - looking at slot %s", |
424 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab SM |
425 | if (cpci_check_and_clear_ins(slot)) { |
426 | /* | |
427 | * Some broken hardware (e.g. PLX 9054AB) asserts | |
428 | * ENUM# twice... | |
429 | */ | |
430 | if (slot->dev) { | |
431 | warn("slot %s already inserted", | |
432 | slot->hotplug_slot->name); | |
1da177e4 LT |
433 | inserted++; |
434 | continue; | |
435 | } | |
436 | ||
437 | /* Process insertion */ | |
438 | dbg("%s - slot %s inserted", | |
439 | __FUNCTION__, slot->hotplug_slot->name); | |
440 | ||
441 | /* GSM, debug */ | |
442 | hs_csr = cpci_get_hs_csr(slot); | |
443 | dbg("%s - slot %s HS_CSR (1) = %04x", | |
444 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
445 | ||
446 | /* Configure device */ | |
447 | dbg("%s - configuring slot %s", | |
448 | __FUNCTION__, slot->hotplug_slot->name); | |
bcc488ab | 449 | if (cpci_configure_slot(slot)) { |
1da177e4 LT |
450 | err("%s - could not configure slot %s", |
451 | __FUNCTION__, slot->hotplug_slot->name); | |
452 | continue; | |
453 | } | |
454 | dbg("%s - finished configuring slot %s", | |
455 | __FUNCTION__, slot->hotplug_slot->name); | |
456 | ||
457 | /* GSM, debug */ | |
458 | hs_csr = cpci_get_hs_csr(slot); | |
459 | dbg("%s - slot %s HS_CSR (2) = %04x", | |
460 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
461 | ||
bcc488ab | 462 | if (update_latch_status(slot->hotplug_slot, 1)) |
1da177e4 | 463 | warn("failure to update latch file"); |
1da177e4 | 464 | |
bcc488ab | 465 | if (update_adapter_status(slot->hotplug_slot, 1)) |
1da177e4 | 466 | warn("failure to update adapter file"); |
1da177e4 LT |
467 | |
468 | cpci_led_off(slot); | |
469 | ||
470 | /* GSM, debug */ | |
471 | hs_csr = cpci_get_hs_csr(slot); | |
472 | dbg("%s - slot %s HS_CSR (3) = %04x", | |
473 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
474 | ||
475 | inserted++; | |
bcc488ab | 476 | } else if (cpci_check_ext(slot)) { |
1da177e4 LT |
477 | /* Process extraction request */ |
478 | dbg("%s - slot %s extracted", | |
479 | __FUNCTION__, slot->hotplug_slot->name); | |
480 | ||
481 | /* GSM, debug */ | |
482 | hs_csr = cpci_get_hs_csr(slot); | |
483 | dbg("%s - slot %s HS_CSR = %04x", | |
484 | __FUNCTION__, slot->hotplug_slot->name, hs_csr); | |
485 | ||
bcc488ab SM |
486 | if (!slot->extracting) { |
487 | if (update_latch_status(slot->hotplug_slot, 0)) { | |
1da177e4 LT |
488 | warn("failure to update latch file"); |
489 | } | |
490 | slot->extracting = 1; | |
bcc488ab | 491 | atomic_inc(&extracting); |
1da177e4 LT |
492 | } |
493 | extracted++; | |
bcc488ab | 494 | } else if (slot->extracting) { |
43b7d7cf | 495 | hs_csr = cpci_get_hs_csr(slot); |
bcc488ab | 496 | if (hs_csr == 0xffff) { |
43b7d7cf SM |
497 | /* |
498 | * Hmmm, we're likely hosed at this point, should we | |
499 | * bother trying to tell the driver or not? | |
500 | */ | |
501 | err("card in slot %s was improperly removed", | |
502 | slot->hotplug_slot->name); | |
bcc488ab | 503 | if (update_adapter_status(slot->hotplug_slot, 0)) |
43b7d7cf | 504 | warn("failure to update adapter file"); |
43b7d7cf SM |
505 | slot->extracting = 0; |
506 | atomic_dec(&extracting); | |
507 | } | |
1da177e4 LT |
508 | } |
509 | } | |
43b7d7cf SM |
510 | up_read(&list_rwsem); |
511 | dbg("inserted=%d, extracted=%d, extracting=%d", | |
512 | inserted, extracted, atomic_read(&extracting)); | |
bcc488ab | 513 | if (inserted || extracted) |
1da177e4 | 514 | return extracted; |
bcc488ab | 515 | else if (!atomic_read(&extracting)) { |
1da177e4 LT |
516 | err("cannot find ENUM# source, shutting down"); |
517 | return -1; | |
518 | } | |
43b7d7cf | 519 | return 0; |
1da177e4 LT |
520 | } |
521 | ||
522 | /* This is the interrupt mode worker thread body */ | |
523 | static int | |
524 | event_thread(void *data) | |
525 | { | |
526 | int rc; | |
1da177e4 LT |
527 | |
528 | lock_kernel(); | |
529 | daemonize("cpci_hp_eventd"); | |
530 | unlock_kernel(); | |
531 | ||
532 | dbg("%s - event thread started", __FUNCTION__); | |
bcc488ab | 533 | while (1) { |
1da177e4 LT |
534 | dbg("event thread sleeping"); |
535 | down_interruptible(&event_semaphore); | |
536 | dbg("event thread woken, thread_finished = %d", | |
537 | thread_finished); | |
bcc488ab | 538 | if (thread_finished || signal_pending(current)) |
1da177e4 | 539 | break; |
43b7d7cf | 540 | do { |
1da177e4 | 541 | rc = check_slots(); |
43b7d7cf | 542 | if (rc > 0) { |
1da177e4 LT |
543 | /* Give userspace a chance to handle extraction */ |
544 | msleep(500); | |
43b7d7cf | 545 | } else if (rc < 0) { |
1da177e4 LT |
546 | dbg("%s - error checking slots", __FUNCTION__); |
547 | thread_finished = 1; | |
548 | break; | |
549 | } | |
bcc488ab SM |
550 | } while (atomic_read(&extracting) && !thread_finished); |
551 | if (thread_finished) | |
552 | break; | |
1da177e4 LT |
553 | |
554 | /* Re-enable ENUM# interrupt */ | |
555 | dbg("%s - re-enabling irq", __FUNCTION__); | |
556 | controller->ops->enable_irq(); | |
557 | } | |
1da177e4 LT |
558 | dbg("%s - event thread signals exit", __FUNCTION__); |
559 | up(&thread_exit); | |
560 | return 0; | |
561 | } | |
562 | ||
563 | /* This is the polling mode worker thread body */ | |
564 | static int | |
565 | poll_thread(void *data) | |
566 | { | |
567 | int rc; | |
1da177e4 LT |
568 | |
569 | lock_kernel(); | |
570 | daemonize("cpci_hp_polld"); | |
571 | unlock_kernel(); | |
572 | ||
bcc488ab SM |
573 | while (1) { |
574 | if (thread_finished || signal_pending(current)) | |
1da177e4 | 575 | break; |
bcc488ab | 576 | if (controller->ops->query_enum()) { |
43b7d7cf SM |
577 | do { |
578 | rc = check_slots(); | |
bcc488ab | 579 | if (rc > 0) { |
43b7d7cf SM |
580 | /* Give userspace a chance to handle extraction */ |
581 | msleep(500); | |
bcc488ab | 582 | } else if (rc < 0) { |
43b7d7cf SM |
583 | dbg("%s - error checking slots", __FUNCTION__); |
584 | thread_finished = 1; | |
585 | break; | |
1da177e4 | 586 | } |
bcc488ab | 587 | } while (atomic_read(&extracting) && !thread_finished); |
1da177e4 | 588 | } |
1da177e4 LT |
589 | msleep(100); |
590 | } | |
591 | dbg("poll thread signals exit"); | |
592 | up(&thread_exit); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static int | |
597 | cpci_start_thread(void) | |
598 | { | |
599 | int pid; | |
600 | ||
601 | /* initialize our semaphores */ | |
602 | init_MUTEX_LOCKED(&event_semaphore); | |
603 | init_MUTEX_LOCKED(&thread_exit); | |
604 | thread_finished = 0; | |
605 | ||
bcc488ab | 606 | if (controller->irq) |
1da177e4 | 607 | pid = kernel_thread(event_thread, NULL, 0); |
bcc488ab | 608 | else |
1da177e4 | 609 | pid = kernel_thread(poll_thread, NULL, 0); |
bcc488ab | 610 | if (pid < 0) { |
1da177e4 LT |
611 | err("Can't start up our thread"); |
612 | return -1; | |
613 | } | |
614 | dbg("Our thread pid = %d", pid); | |
615 | return 0; | |
616 | } | |
617 | ||
618 | static void | |
619 | cpci_stop_thread(void) | |
620 | { | |
621 | thread_finished = 1; | |
622 | dbg("thread finish command given"); | |
bcc488ab | 623 | if (controller->irq) |
1da177e4 | 624 | up(&event_semaphore); |
1da177e4 LT |
625 | dbg("wait for thread to exit"); |
626 | down(&thread_exit); | |
627 | } | |
628 | ||
629 | int | |
630 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) | |
631 | { | |
632 | int status = 0; | |
633 | ||
bcc488ab SM |
634 | if (controller) |
635 | return -1; | |
636 | if (!(new_controller && new_controller->ops)) | |
637 | return -EINVAL; | |
638 | if (new_controller->irq) { | |
639 | if (!(new_controller->ops->enable_irq && | |
640 | new_controller->ops->disable_irq)) | |
641 | status = -EINVAL; | |
642 | if (request_irq(new_controller->irq, | |
643 | cpci_hp_intr, | |
644 | new_controller->irq_flags, | |
645 | MY_NAME, | |
646 | new_controller->dev_id)) { | |
647 | err("Can't get irq %d for the hotplug cPCI controller", | |
648 | new_controller->irq); | |
649 | status = -ENODEV; | |
1da177e4 | 650 | } |
bcc488ab SM |
651 | dbg("%s - acquired controller irq %d", |
652 | __FUNCTION__, new_controller->irq); | |
1da177e4 | 653 | } |
bcc488ab SM |
654 | if (!status) |
655 | controller = new_controller; | |
1da177e4 LT |
656 | return status; |
657 | } | |
658 | ||
bcc488ab SM |
659 | static void |
660 | cleanup_slots(void) | |
661 | { | |
662 | struct slot *slot; | |
663 | struct slot *tmp; | |
664 | ||
665 | /* | |
666 | * Unregister all of our slots with the pci_hotplug subsystem, | |
667 | * and free up all memory that we had allocated. | |
668 | */ | |
669 | down_write(&list_rwsem); | |
670 | if (!slots) | |
671 | goto cleanup_null; | |
672 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { | |
673 | list_del(&slot->slot_list); | |
674 | pci_hp_deregister(slot->hotplug_slot); | |
675 | } | |
676 | cleanup_null: | |
677 | up_write(&list_rwsem); | |
678 | return; | |
679 | } | |
680 | ||
1da177e4 LT |
681 | int |
682 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
683 | { | |
684 | int status = 0; | |
685 | ||
bcc488ab SM |
686 | if (controller) { |
687 | if (!thread_finished) | |
1da177e4 | 688 | cpci_stop_thread(); |
bcc488ab | 689 | if (controller->irq) |
1da177e4 | 690 | free_irq(controller->irq, controller->dev_id); |
1da177e4 | 691 | controller = NULL; |
bcc488ab SM |
692 | cleanup_slots(); |
693 | } else | |
1da177e4 | 694 | status = -ENODEV; |
1da177e4 LT |
695 | return status; |
696 | } | |
697 | ||
698 | int | |
699 | cpci_hp_start(void) | |
700 | { | |
701 | static int first = 1; | |
702 | int status; | |
703 | ||
704 | dbg("%s - enter", __FUNCTION__); | |
bcc488ab | 705 | if (!controller) |
1da177e4 | 706 | return -ENODEV; |
1da177e4 | 707 | |
43b7d7cf | 708 | down_read(&list_rwsem); |
bcc488ab | 709 | if (list_empty(&slot_list)) { |
43b7d7cf | 710 | up_read(&list_rwsem); |
1da177e4 LT |
711 | return -ENODEV; |
712 | } | |
43b7d7cf | 713 | up_read(&list_rwsem); |
1da177e4 | 714 | |
bcc488ab SM |
715 | status = init_slots(first); |
716 | if (first) | |
1da177e4 | 717 | first = 0; |
bcc488ab SM |
718 | if (status) |
719 | return status; | |
1da177e4 LT |
720 | |
721 | status = cpci_start_thread(); | |
bcc488ab | 722 | if (status) |
1da177e4 | 723 | return status; |
1da177e4 LT |
724 | dbg("%s - thread started", __FUNCTION__); |
725 | ||
bcc488ab | 726 | if (controller->irq) { |
1da177e4 LT |
727 | /* Start enum interrupt processing */ |
728 | dbg("%s - enabling irq", __FUNCTION__); | |
729 | controller->ops->enable_irq(); | |
730 | } | |
731 | dbg("%s - exit", __FUNCTION__); | |
732 | return 0; | |
733 | } | |
734 | ||
735 | int | |
736 | cpci_hp_stop(void) | |
737 | { | |
bcc488ab | 738 | if (!controller) |
1da177e4 | 739 | return -ENODEV; |
bcc488ab | 740 | if (controller->irq) { |
1da177e4 LT |
741 | /* Stop enum interrupt processing */ |
742 | dbg("%s - disabling irq", __FUNCTION__); | |
743 | controller->ops->disable_irq(); | |
744 | } | |
745 | cpci_stop_thread(); | |
746 | return 0; | |
747 | } | |
748 | ||
1da177e4 LT |
749 | int __init |
750 | cpci_hotplug_init(int debug) | |
751 | { | |
1da177e4 | 752 | cpci_debug = debug; |
1da177e4 LT |
753 | return 0; |
754 | } | |
755 | ||
756 | void __exit | |
757 | cpci_hotplug_exit(void) | |
758 | { | |
759 | /* | |
760 | * Clean everything up. | |
761 | */ | |
bcc488ab SM |
762 | cpci_hp_stop(); |
763 | cpci_hp_unregister_controller(controller); | |
1da177e4 LT |
764 | } |
765 | ||
766 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); | |
767 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); | |
768 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); | |
769 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); | |
770 | EXPORT_SYMBOL_GPL(cpci_hp_start); | |
771 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |