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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> | |
7a54f25c | 32 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
33 | #include <linux/init.h> |
34 | #include <linux/interrupt.h> | |
60063497 | 35 | #include <linux/atomic.h> |
1da177e4 | 36 | #include <linux/delay.h> |
0bec2c85 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
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; | |
0bec2c85 SM |
62 | static struct task_struct *cpci_thread; |
63 | static int thread_finished; | |
1da177e4 LT |
64 | |
65 | static int enable_slot(struct hotplug_slot *slot); | |
66 | static int disable_slot(struct hotplug_slot *slot); | |
67 | static int set_attention_status(struct hotplug_slot *slot, u8 value); | |
68 | static int get_power_status(struct hotplug_slot *slot, u8 * value); | |
69 | static int get_attention_status(struct hotplug_slot *slot, u8 * value); | |
43b7d7cf SM |
70 | static int get_adapter_status(struct hotplug_slot *slot, u8 * value); |
71 | static int get_latch_status(struct hotplug_slot *slot, u8 * value); | |
1da177e4 LT |
72 | |
73 | static struct hotplug_slot_ops cpci_hotplug_slot_ops = { | |
1da177e4 LT |
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, | |
43b7d7cf SM |
79 | .get_adapter_status = get_adapter_status, |
80 | .get_latch_status = get_latch_status, | |
1da177e4 LT |
81 | }; |
82 | ||
83 | static int | |
84 | update_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 | ||
93 | static int | |
94 | update_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 | ||
103 | static int | |
104 | enable_slot(struct hotplug_slot *hotplug_slot) | |
105 | { | |
106 | struct slot *slot = hotplug_slot->private; | |
107 | int retval = 0; | |
108 | ||
d6c479e0 | 109 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
1da177e4 | 110 | |
bcc488ab | 111 | if (controller->ops->set_power) |
1da177e4 | 112 | retval = controller->ops->set_power(slot, 1); |
1da177e4 LT |
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 | ||
d6c479e0 | 122 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
1da177e4 | 123 | |
bcc488ab SM |
124 | down_write(&list_rwsem); |
125 | ||
1da177e4 | 126 | /* Unconfigure device */ |
d6c479e0 | 127 | dbg("%s - unconfiguring slot %s", __func__, slot_name(slot)); |
bcc488ab | 128 | if ((retval = cpci_unconfigure_slot(slot))) { |
1da177e4 | 129 | err("%s - could not unconfigure slot %s", |
d6c479e0 | 130 | __func__, slot_name(slot)); |
bcc488ab | 131 | goto disable_error; |
1da177e4 | 132 | } |
d6c479e0 | 133 | dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot)); |
1da177e4 LT |
134 | |
135 | /* Clear EXT (by setting it) */ | |
bcc488ab | 136 | if (cpci_clear_ext(slot)) { |
1da177e4 | 137 | err("%s - could not clear EXT for slot %s", |
d6c479e0 | 138 | __func__, slot_name(slot)); |
1da177e4 | 139 | retval = -ENODEV; |
bcc488ab | 140 | goto disable_error; |
1da177e4 LT |
141 | } |
142 | cpci_led_on(slot); | |
143 | ||
bcc488ab SM |
144 | if (controller->ops->set_power) |
145 | if ((retval = controller->ops->set_power(slot, 0))) | |
146 | goto disable_error; | |
1da177e4 | 147 | |
bcc488ab | 148 | if (update_adapter_status(slot->hotplug_slot, 0)) |
1da177e4 | 149 | warn("failure to update adapter file"); |
1da177e4 | 150 | |
bcc488ab | 151 | if (slot->extracting) { |
43b7d7cf SM |
152 | slot->extracting = 0; |
153 | atomic_dec(&extracting); | |
154 | } | |
bcc488ab SM |
155 | disable_error: |
156 | up_write(&list_rwsem); | |
1da177e4 LT |
157 | return retval; |
158 | } | |
159 | ||
160 | static u8 | |
161 | cpci_get_power_status(struct slot *slot) | |
162 | { | |
163 | u8 power = 1; | |
164 | ||
bcc488ab | 165 | if (controller->ops->get_power) |
1da177e4 | 166 | power = controller->ops->get_power(slot); |
1da177e4 LT |
167 | return power; |
168 | } | |
169 | ||
170 | static int | |
171 | get_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 | ||
179 | static int | |
180 | get_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 | ||
188 | static int | |
189 | set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
190 | { | |
191 | return cpci_set_attention_status(hotplug_slot->private, status); | |
192 | } | |
193 | ||
43b7d7cf SM |
194 | static int |
195 | get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
196 | { | |
197 | *value = hotplug_slot->info->adapter_status; | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static int | |
202 | get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
203 | { | |
204 | *value = hotplug_slot->info->latch_status; | |
205 | return 0; | |
206 | } | |
207 | ||
1da177e4 LT |
208 | static void release_slot(struct hotplug_slot *hotplug_slot) |
209 | { | |
210 | struct slot *slot = hotplug_slot->private; | |
211 | ||
212 | kfree(slot->hotplug_slot->info); | |
1da177e4 | 213 | kfree(slot->hotplug_slot); |
03e49d40 SM |
214 | if (slot->dev) |
215 | pci_dev_put(slot->dev); | |
1da177e4 LT |
216 | kfree(slot); |
217 | } | |
218 | ||
219 | #define SLOT_NAME_SIZE 6 | |
1da177e4 LT |
220 | |
221 | int | |
222 | cpci_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; | |
d6c479e0 | 227 | char name[SLOT_NAME_SIZE]; |
83d05710 | 228 | int status; |
1da177e4 LT |
229 | int i; |
230 | ||
bcc488ab | 231 | if (!(controller && bus)) |
1da177e4 | 232 | return -ENODEV; |
1da177e4 LT |
233 | |
234 | /* | |
235 | * Create a structure for each slot, and register that slot | |
236 | * with the pci_hotplug subsystem. | |
237 | */ | |
238 | for (i = first; i <= last; ++i) { | |
f5afe806 | 239 | slot = kzalloc(sizeof (struct slot), GFP_KERNEL); |
83d05710 JL |
240 | if (!slot) { |
241 | status = -ENOMEM; | |
1da177e4 | 242 | goto error; |
83d05710 | 243 | } |
1da177e4 LT |
244 | |
245 | hotplug_slot = | |
f5afe806 | 246 | kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL); |
83d05710 JL |
247 | if (!hotplug_slot) { |
248 | status = -ENOMEM; | |
1da177e4 | 249 | goto error_slot; |
83d05710 | 250 | } |
1da177e4 LT |
251 | slot->hotplug_slot = hotplug_slot; |
252 | ||
f5afe806 | 253 | info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); |
83d05710 JL |
254 | if (!info) { |
255 | status = -ENOMEM; | |
1da177e4 | 256 | goto error_hpslot; |
83d05710 | 257 | } |
1da177e4 LT |
258 | hotplug_slot->info = info; |
259 | ||
1da177e4 LT |
260 | slot->bus = bus; |
261 | slot->number = i; | |
262 | slot->devfn = PCI_DEVFN(i, 0); | |
263 | ||
d6c479e0 AC |
264 | snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i); |
265 | ||
1da177e4 LT |
266 | hotplug_slot->private = slot; |
267 | hotplug_slot->release = &release_slot; | |
1da177e4 LT |
268 | hotplug_slot->ops = &cpci_hotplug_slot_ops; |
269 | ||
270 | /* | |
271 | * Initialize the slot info structure with some known | |
272 | * good values. | |
273 | */ | |
d6c479e0 | 274 | dbg("initializing slot %s", name); |
1da177e4 LT |
275 | info->power_status = cpci_get_power_status(slot); |
276 | info->attention_status = cpci_get_attention_status(slot); | |
277 | ||
d6c479e0 AC |
278 | dbg("registering slot %s", name); |
279 | status = pci_hp_register(slot->hotplug_slot, bus, i, name); | |
1da177e4 LT |
280 | if (status) { |
281 | err("pci_hp_register failed with error %d", status); | |
d6c479e0 | 282 | goto error_info; |
1da177e4 | 283 | } |
d6c479e0 | 284 | dbg("slot registered with name: %s", slot_name(slot)); |
1da177e4 LT |
285 | |
286 | /* Add slot to our internal list */ | |
43b7d7cf | 287 | down_write(&list_rwsem); |
1da177e4 LT |
288 | list_add(&slot->slot_list, &slot_list); |
289 | slots++; | |
43b7d7cf | 290 | up_write(&list_rwsem); |
1da177e4 LT |
291 | } |
292 | return 0; | |
1da177e4 LT |
293 | error_info: |
294 | kfree(info); | |
295 | error_hpslot: | |
296 | kfree(hotplug_slot); | |
297 | error_slot: | |
298 | kfree(slot); | |
299 | error: | |
300 | return status; | |
301 | } | |
302 | ||
303 | int | |
304 | cpci_hp_unregister_bus(struct pci_bus *bus) | |
305 | { | |
306 | struct slot *slot; | |
bcc488ab SM |
307 | struct slot *tmp; |
308 | int status = 0; | |
1da177e4 | 309 | |
43b7d7cf | 310 | down_write(&list_rwsem); |
bcc488ab | 311 | if (!slots) { |
43b7d7cf | 312 | up_write(&list_rwsem); |
1da177e4 LT |
313 | return -1; |
314 | } | |
bcc488ab SM |
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 | ||
d6c479e0 | 320 | dbg("deregistering slot %s", slot_name(slot)); |
1da177e4 | 321 | status = pci_hp_deregister(slot->hotplug_slot); |
bcc488ab | 322 | if (status) { |
1da177e4 LT |
323 | err("pci_hp_deregister failed with error %d", |
324 | status); | |
bcc488ab | 325 | break; |
1da177e4 | 326 | } |
1da177e4 LT |
327 | } |
328 | } | |
43b7d7cf | 329 | up_write(&list_rwsem); |
bcc488ab | 330 | return status; |
1da177e4 LT |
331 | } |
332 | ||
333 | /* This is the interrupt mode interrupt handler */ | |
334 | static irqreturn_t | |
7d12e780 | 335 | cpci_hp_intr(int irq, void *data) |
1da177e4 LT |
336 | { |
337 | dbg("entered cpci_hp_intr"); | |
338 | ||
339 | /* Check to see if it was our interrupt */ | |
6b4486e2 | 340 | if ((controller->irq_flags & IRQF_SHARED) && |
1da177e4 LT |
341 | !controller->ops->check_irq(controller->dev_id)) { |
342 | dbg("exited cpci_hp_intr, not our interrupt"); | |
343 | return IRQ_NONE; | |
344 | } | |
345 | ||
346 | /* Disable ENUM interrupt */ | |
347 | controller->ops->disable_irq(); | |
348 | ||
349 | /* Trigger processing by the event thread */ | |
0bec2c85 | 350 | wake_up_process(cpci_thread); |
1da177e4 LT |
351 | return IRQ_HANDLED; |
352 | } | |
353 | ||
354 | /* | |
43b7d7cf | 355 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
1da177e4 LT |
356 | * initialization, the system driver shall clear the |
357 | * INS bits of the cold-inserted devices. | |
358 | */ | |
359 | static int | |
bcc488ab | 360 | init_slots(int clear_ins) |
1da177e4 LT |
361 | { |
362 | struct slot *slot; | |
1da177e4 LT |
363 | struct pci_dev* dev; |
364 | ||
66bef8c0 | 365 | dbg("%s - enter", __func__); |
43b7d7cf | 366 | down_read(&list_rwsem); |
bcc488ab | 367 | if (!slots) { |
43b7d7cf | 368 | up_read(&list_rwsem); |
1da177e4 LT |
369 | return -1; |
370 | } | |
bcc488ab | 371 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 372 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab | 373 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
1da177e4 | 374 | dbg("%s - cleared INS for slot %s", |
d6c479e0 | 375 | __func__, slot_name(slot)); |
bcc488ab SM |
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; | |
1da177e4 LT |
383 | } |
384 | } | |
43b7d7cf | 385 | up_read(&list_rwsem); |
66bef8c0 | 386 | dbg("%s - exit", __func__); |
1da177e4 LT |
387 | return 0; |
388 | } | |
389 | ||
390 | static int | |
391 | check_slots(void) | |
392 | { | |
393 | struct slot *slot; | |
1da177e4 LT |
394 | int extracted; |
395 | int inserted; | |
43b7d7cf | 396 | u16 hs_csr; |
1da177e4 | 397 | |
43b7d7cf | 398 | down_read(&list_rwsem); |
bcc488ab | 399 | if (!slots) { |
43b7d7cf | 400 | up_read(&list_rwsem); |
1da177e4 LT |
401 | err("no slots registered, shutting down"); |
402 | return -1; | |
403 | } | |
404 | extracted = inserted = 0; | |
bcc488ab | 405 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 406 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab SM |
407 | if (cpci_check_and_clear_ins(slot)) { |
408 | /* | |
409 | * Some broken hardware (e.g. PLX 9054AB) asserts | |
410 | * ENUM# twice... | |
411 | */ | |
412 | if (slot->dev) { | |
413 | warn("slot %s already inserted", | |
d6c479e0 | 414 | slot_name(slot)); |
1da177e4 LT |
415 | inserted++; |
416 | continue; | |
417 | } | |
418 | ||
419 | /* Process insertion */ | |
d6c479e0 | 420 | dbg("%s - slot %s inserted", __func__, slot_name(slot)); |
1da177e4 LT |
421 | |
422 | /* GSM, debug */ | |
423 | hs_csr = cpci_get_hs_csr(slot); | |
424 | dbg("%s - slot %s HS_CSR (1) = %04x", | |
d6c479e0 | 425 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
426 | |
427 | /* Configure device */ | |
428 | dbg("%s - configuring slot %s", | |
d6c479e0 | 429 | __func__, slot_name(slot)); |
bcc488ab | 430 | if (cpci_configure_slot(slot)) { |
1da177e4 | 431 | err("%s - could not configure slot %s", |
d6c479e0 | 432 | __func__, slot_name(slot)); |
1da177e4 LT |
433 | continue; |
434 | } | |
435 | dbg("%s - finished configuring slot %s", | |
d6c479e0 | 436 | __func__, slot_name(slot)); |
1da177e4 LT |
437 | |
438 | /* GSM, debug */ | |
439 | hs_csr = cpci_get_hs_csr(slot); | |
440 | dbg("%s - slot %s HS_CSR (2) = %04x", | |
d6c479e0 | 441 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 442 | |
bcc488ab | 443 | if (update_latch_status(slot->hotplug_slot, 1)) |
1da177e4 | 444 | warn("failure to update latch file"); |
1da177e4 | 445 | |
bcc488ab | 446 | if (update_adapter_status(slot->hotplug_slot, 1)) |
1da177e4 | 447 | warn("failure to update adapter file"); |
1da177e4 LT |
448 | |
449 | cpci_led_off(slot); | |
450 | ||
451 | /* GSM, debug */ | |
452 | hs_csr = cpci_get_hs_csr(slot); | |
453 | dbg("%s - slot %s HS_CSR (3) = %04x", | |
d6c479e0 | 454 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
455 | |
456 | inserted++; | |
bcc488ab | 457 | } else if (cpci_check_ext(slot)) { |
1da177e4 LT |
458 | /* Process extraction request */ |
459 | dbg("%s - slot %s extracted", | |
d6c479e0 | 460 | __func__, slot_name(slot)); |
1da177e4 LT |
461 | |
462 | /* GSM, debug */ | |
463 | hs_csr = cpci_get_hs_csr(slot); | |
464 | dbg("%s - slot %s HS_CSR = %04x", | |
d6c479e0 | 465 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 466 | |
bcc488ab SM |
467 | if (!slot->extracting) { |
468 | if (update_latch_status(slot->hotplug_slot, 0)) { | |
1da177e4 LT |
469 | warn("failure to update latch file"); |
470 | } | |
471 | slot->extracting = 1; | |
bcc488ab | 472 | atomic_inc(&extracting); |
1da177e4 LT |
473 | } |
474 | extracted++; | |
bcc488ab | 475 | } else if (slot->extracting) { |
43b7d7cf | 476 | hs_csr = cpci_get_hs_csr(slot); |
bcc488ab | 477 | if (hs_csr == 0xffff) { |
43b7d7cf SM |
478 | /* |
479 | * Hmmm, we're likely hosed at this point, should we | |
480 | * bother trying to tell the driver or not? | |
481 | */ | |
482 | err("card in slot %s was improperly removed", | |
d6c479e0 | 483 | slot_name(slot)); |
bcc488ab | 484 | if (update_adapter_status(slot->hotplug_slot, 0)) |
43b7d7cf | 485 | warn("failure to update adapter file"); |
43b7d7cf SM |
486 | slot->extracting = 0; |
487 | atomic_dec(&extracting); | |
488 | } | |
1da177e4 LT |
489 | } |
490 | } | |
43b7d7cf SM |
491 | up_read(&list_rwsem); |
492 | dbg("inserted=%d, extracted=%d, extracting=%d", | |
493 | inserted, extracted, atomic_read(&extracting)); | |
bcc488ab | 494 | if (inserted || extracted) |
1da177e4 | 495 | return extracted; |
bcc488ab | 496 | else if (!atomic_read(&extracting)) { |
1da177e4 LT |
497 | err("cannot find ENUM# source, shutting down"); |
498 | return -1; | |
499 | } | |
43b7d7cf | 500 | return 0; |
1da177e4 LT |
501 | } |
502 | ||
503 | /* This is the interrupt mode worker thread body */ | |
504 | static int | |
505 | event_thread(void *data) | |
506 | { | |
507 | int rc; | |
1da177e4 | 508 | |
66bef8c0 | 509 | dbg("%s - event thread started", __func__); |
bcc488ab | 510 | while (1) { |
1da177e4 | 511 | dbg("event thread sleeping"); |
0bec2c85 SM |
512 | set_current_state(TASK_INTERRUPTIBLE); |
513 | schedule(); | |
514 | if (kthread_should_stop()) | |
1da177e4 | 515 | break; |
43b7d7cf | 516 | do { |
1da177e4 | 517 | rc = check_slots(); |
43b7d7cf | 518 | if (rc > 0) { |
1da177e4 LT |
519 | /* Give userspace a chance to handle extraction */ |
520 | msleep(500); | |
43b7d7cf | 521 | } else if (rc < 0) { |
66bef8c0 | 522 | dbg("%s - error checking slots", __func__); |
1da177e4 | 523 | thread_finished = 1; |
0bec2c85 | 524 | goto out; |
1da177e4 | 525 | } |
0bec2c85 SM |
526 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
527 | if (kthread_should_stop()) | |
bcc488ab | 528 | break; |
1da177e4 LT |
529 | |
530 | /* Re-enable ENUM# interrupt */ | |
66bef8c0 | 531 | dbg("%s - re-enabling irq", __func__); |
1da177e4 LT |
532 | controller->ops->enable_irq(); |
533 | } | |
0bec2c85 | 534 | out: |
1da177e4 LT |
535 | return 0; |
536 | } | |
537 | ||
538 | /* This is the polling mode worker thread body */ | |
539 | static int | |
540 | poll_thread(void *data) | |
541 | { | |
542 | int rc; | |
1da177e4 | 543 | |
bcc488ab | 544 | while (1) { |
0bec2c85 | 545 | if (kthread_should_stop() || signal_pending(current)) |
1da177e4 | 546 | break; |
bcc488ab | 547 | if (controller->ops->query_enum()) { |
43b7d7cf SM |
548 | do { |
549 | rc = check_slots(); | |
bcc488ab | 550 | if (rc > 0) { |
43b7d7cf SM |
551 | /* Give userspace a chance to handle extraction */ |
552 | msleep(500); | |
bcc488ab | 553 | } else if (rc < 0) { |
66bef8c0 | 554 | dbg("%s - error checking slots", __func__); |
43b7d7cf | 555 | thread_finished = 1; |
0bec2c85 | 556 | goto out; |
1da177e4 | 557 | } |
0bec2c85 | 558 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
1da177e4 | 559 | } |
1da177e4 LT |
560 | msleep(100); |
561 | } | |
0bec2c85 | 562 | out: |
1da177e4 LT |
563 | return 0; |
564 | } | |
565 | ||
566 | static int | |
567 | cpci_start_thread(void) | |
568 | { | |
bcc488ab | 569 | if (controller->irq) |
0bec2c85 | 570 | cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd"); |
bcc488ab | 571 | else |
0bec2c85 SM |
572 | cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld"); |
573 | if (IS_ERR(cpci_thread)) { | |
1da177e4 | 574 | err("Can't start up our thread"); |
0bec2c85 | 575 | return PTR_ERR(cpci_thread); |
1da177e4 | 576 | } |
0bec2c85 | 577 | thread_finished = 0; |
1da177e4 LT |
578 | return 0; |
579 | } | |
580 | ||
581 | static void | |
582 | cpci_stop_thread(void) | |
583 | { | |
0bec2c85 | 584 | kthread_stop(cpci_thread); |
1da177e4 | 585 | thread_finished = 1; |
1da177e4 LT |
586 | } |
587 | ||
588 | int | |
589 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) | |
590 | { | |
591 | int status = 0; | |
592 | ||
bcc488ab SM |
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; | |
1da177e4 | 609 | } |
bcc488ab | 610 | dbg("%s - acquired controller irq %d", |
66bef8c0 | 611 | __func__, new_controller->irq); |
1da177e4 | 612 | } |
bcc488ab SM |
613 | if (!status) |
614 | controller = new_controller; | |
1da177e4 LT |
615 | return status; |
616 | } | |
617 | ||
bcc488ab SM |
618 | static void |
619 | cleanup_slots(void) | |
620 | { | |
621 | struct slot *slot; | |
622 | struct slot *tmp; | |
623 | ||
624 | /* | |
625 | * Unregister all of our slots with the pci_hotplug subsystem, | |
626 | * and free up all memory that we had allocated. | |
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 | } | |
635 | cleanup_null: | |
636 | up_write(&list_rwsem); | |
637 | return; | |
638 | } | |
639 | ||
1da177e4 LT |
640 | int |
641 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
642 | { | |
643 | int status = 0; | |
644 | ||
bcc488ab SM |
645 | if (controller) { |
646 | if (!thread_finished) | |
1da177e4 | 647 | cpci_stop_thread(); |
bcc488ab | 648 | if (controller->irq) |
1da177e4 | 649 | free_irq(controller->irq, controller->dev_id); |
1da177e4 | 650 | controller = NULL; |
bcc488ab SM |
651 | cleanup_slots(); |
652 | } else | |
1da177e4 | 653 | status = -ENODEV; |
1da177e4 LT |
654 | return status; |
655 | } | |
656 | ||
657 | int | |
658 | cpci_hp_start(void) | |
659 | { | |
660 | static int first = 1; | |
661 | int status; | |
662 | ||
66bef8c0 | 663 | dbg("%s - enter", __func__); |
bcc488ab | 664 | if (!controller) |
1da177e4 | 665 | return -ENODEV; |
1da177e4 | 666 | |
43b7d7cf | 667 | down_read(&list_rwsem); |
bcc488ab | 668 | if (list_empty(&slot_list)) { |
43b7d7cf | 669 | up_read(&list_rwsem); |
1da177e4 LT |
670 | return -ENODEV; |
671 | } | |
43b7d7cf | 672 | up_read(&list_rwsem); |
1da177e4 | 673 | |
bcc488ab SM |
674 | status = init_slots(first); |
675 | if (first) | |
1da177e4 | 676 | first = 0; |
bcc488ab SM |
677 | if (status) |
678 | return status; | |
1da177e4 LT |
679 | |
680 | status = cpci_start_thread(); | |
bcc488ab | 681 | if (status) |
1da177e4 | 682 | return status; |
66bef8c0 | 683 | dbg("%s - thread started", __func__); |
1da177e4 | 684 | |
bcc488ab | 685 | if (controller->irq) { |
1da177e4 | 686 | /* Start enum interrupt processing */ |
66bef8c0 | 687 | dbg("%s - enabling irq", __func__); |
1da177e4 LT |
688 | controller->ops->enable_irq(); |
689 | } | |
66bef8c0 | 690 | dbg("%s - exit", __func__); |
1da177e4 LT |
691 | return 0; |
692 | } | |
693 | ||
694 | int | |
695 | cpci_hp_stop(void) | |
696 | { | |
bcc488ab | 697 | if (!controller) |
1da177e4 | 698 | return -ENODEV; |
bcc488ab | 699 | if (controller->irq) { |
1da177e4 | 700 | /* Stop enum interrupt processing */ |
66bef8c0 | 701 | dbg("%s - disabling irq", __func__); |
1da177e4 LT |
702 | controller->ops->disable_irq(); |
703 | } | |
704 | cpci_stop_thread(); | |
705 | return 0; | |
706 | } | |
707 | ||
1da177e4 LT |
708 | int __init |
709 | cpci_hotplug_init(int debug) | |
710 | { | |
1da177e4 | 711 | cpci_debug = debug; |
1da177e4 LT |
712 | return 0; |
713 | } | |
714 | ||
715 | void __exit | |
716 | cpci_hotplug_exit(void) | |
717 | { | |
718 | /* | |
719 | * Clean everything up. | |
720 | */ | |
bcc488ab SM |
721 | cpci_hp_stop(); |
722 | cpci_hp_unregister_controller(controller); | |
1da177e4 LT |
723 | } |
724 | ||
725 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); | |
726 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); | |
727 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); | |
728 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); | |
729 | EXPORT_SYMBOL_GPL(cpci_hp_start); | |
730 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |