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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> | |
174cd4b1 | 30 | #include <linux/sched/signal.h> |
1da177e4 LT |
31 | #include <linux/slab.h> |
32 | #include <linux/pci.h> | |
7a54f25c | 33 | #include <linux/pci_hotplug.h> |
1da177e4 LT |
34 | #include <linux/init.h> |
35 | #include <linux/interrupt.h> | |
60063497 | 36 | #include <linux/atomic.h> |
1da177e4 | 37 | #include <linux/delay.h> |
0bec2c85 | 38 | #include <linux/kthread.h> |
1da177e4 LT |
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) \ |
ff3ce480 BS |
49 | printk(KERN_DEBUG "%s: " format "\n", \ |
50 | MY_NAME, ## arg); \ | |
bcc488ab | 51 | } while (0) |
ff3ce480 BS |
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) | |
1da177e4 LT |
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; | |
0bec2c85 SM |
63 | static struct task_struct *cpci_thread; |
64 | static int thread_finished; | |
1da177e4 LT |
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); | |
3c78bc61 RD |
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 | 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 = { | |
1da177e4 LT |
75 | .enable_slot = enable_slot, |
76 | .disable_slot = disable_slot, | |
77 | .set_attention_status = set_attention_status, | |
78 | .get_power_status = get_power_status, | |
79 | .get_attention_status = get_attention_status, | |
43b7d7cf SM |
80 | .get_adapter_status = get_adapter_status, |
81 | .get_latch_status = get_latch_status, | |
1da177e4 LT |
82 | }; |
83 | ||
84 | static int | |
85 | update_latch_status(struct hotplug_slot *hotplug_slot, u8 value) | |
86 | { | |
87 | struct hotplug_slot_info info; | |
88 | ||
89 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
90 | info.latch_status = value; | |
91 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
92 | } | |
93 | ||
94 | static int | |
95 | update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value) | |
96 | { | |
97 | struct hotplug_slot_info info; | |
98 | ||
99 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
100 | info.adapter_status = value; | |
101 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
102 | } | |
103 | ||
104 | static int | |
105 | enable_slot(struct hotplug_slot *hotplug_slot) | |
106 | { | |
107 | struct slot *slot = hotplug_slot->private; | |
108 | int retval = 0; | |
109 | ||
d6c479e0 | 110 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
1da177e4 | 111 | |
bcc488ab | 112 | if (controller->ops->set_power) |
1da177e4 | 113 | retval = controller->ops->set_power(slot, 1); |
1da177e4 LT |
114 | return retval; |
115 | } | |
116 | ||
117 | static int | |
118 | disable_slot(struct hotplug_slot *hotplug_slot) | |
119 | { | |
120 | struct slot *slot = hotplug_slot->private; | |
121 | int retval = 0; | |
122 | ||
d6c479e0 | 123 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
1da177e4 | 124 | |
bcc488ab SM |
125 | down_write(&list_rwsem); |
126 | ||
1da177e4 | 127 | /* Unconfigure device */ |
d6c479e0 | 128 | dbg("%s - unconfiguring slot %s", __func__, slot_name(slot)); |
79e50e72 QL |
129 | retval = cpci_unconfigure_slot(slot); |
130 | if (retval) { | |
1da177e4 | 131 | err("%s - could not unconfigure slot %s", |
d6c479e0 | 132 | __func__, slot_name(slot)); |
bcc488ab | 133 | goto disable_error; |
1da177e4 | 134 | } |
d6c479e0 | 135 | dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot)); |
1da177e4 LT |
136 | |
137 | /* Clear EXT (by setting it) */ | |
bcc488ab | 138 | if (cpci_clear_ext(slot)) { |
1da177e4 | 139 | err("%s - could not clear EXT for slot %s", |
d6c479e0 | 140 | __func__, slot_name(slot)); |
1da177e4 | 141 | retval = -ENODEV; |
bcc488ab | 142 | goto disable_error; |
1da177e4 LT |
143 | } |
144 | cpci_led_on(slot); | |
145 | ||
79e50e72 QL |
146 | if (controller->ops->set_power) { |
147 | retval = controller->ops->set_power(slot, 0); | |
148 | if (retval) | |
bcc488ab | 149 | goto disable_error; |
79e50e72 | 150 | } |
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 | |
3c78bc61 | 175 | get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) |
1da177e4 LT |
176 | { |
177 | struct slot *slot = hotplug_slot->private; | |
178 | ||
179 | *value = cpci_get_power_status(slot); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int | |
3c78bc61 | 184 | get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
1da177e4 LT |
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 | 198 | static int |
3c78bc61 | 199 | get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) |
43b7d7cf SM |
200 | { |
201 | *value = hotplug_slot->info->adapter_status; | |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int | |
3c78bc61 | 206 | get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) |
43b7d7cf SM |
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); | |
1da177e4 | 217 | kfree(slot->hotplug_slot); |
17f14b51 | 218 | pci_dev_put(slot->dev); |
1da177e4 LT |
219 | kfree(slot); |
220 | } | |
221 | ||
222 | #define SLOT_NAME_SIZE 6 | |
1da177e4 LT |
223 | |
224 | int | |
225 | cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) | |
226 | { | |
227 | struct slot *slot; | |
228 | struct hotplug_slot *hotplug_slot; | |
229 | struct hotplug_slot_info *info; | |
d6c479e0 | 230 | char name[SLOT_NAME_SIZE]; |
83d05710 | 231 | int status; |
1da177e4 LT |
232 | int i; |
233 | ||
bcc488ab | 234 | if (!(controller && bus)) |
1da177e4 | 235 | return -ENODEV; |
1da177e4 LT |
236 | |
237 | /* | |
238 | * Create a structure for each slot, and register that slot | |
239 | * with the pci_hotplug subsystem. | |
240 | */ | |
241 | for (i = first; i <= last; ++i) { | |
ff3ce480 | 242 | slot = kzalloc(sizeof(struct slot), GFP_KERNEL); |
83d05710 JL |
243 | if (!slot) { |
244 | status = -ENOMEM; | |
1da177e4 | 245 | goto error; |
83d05710 | 246 | } |
1da177e4 LT |
247 | |
248 | hotplug_slot = | |
ff3ce480 | 249 | kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL); |
83d05710 JL |
250 | if (!hotplug_slot) { |
251 | status = -ENOMEM; | |
1da177e4 | 252 | goto error_slot; |
83d05710 | 253 | } |
1da177e4 LT |
254 | slot->hotplug_slot = hotplug_slot; |
255 | ||
ff3ce480 | 256 | info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL); |
83d05710 JL |
257 | if (!info) { |
258 | status = -ENOMEM; | |
1da177e4 | 259 | goto error_hpslot; |
83d05710 | 260 | } |
1da177e4 LT |
261 | hotplug_slot->info = info; |
262 | ||
1da177e4 LT |
263 | slot->bus = bus; |
264 | slot->number = i; | |
265 | slot->devfn = PCI_DEVFN(i, 0); | |
266 | ||
d6c479e0 AC |
267 | snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i); |
268 | ||
1da177e4 LT |
269 | hotplug_slot->private = slot; |
270 | hotplug_slot->release = &release_slot; | |
1da177e4 LT |
271 | hotplug_slot->ops = &cpci_hotplug_slot_ops; |
272 | ||
273 | /* | |
274 | * Initialize the slot info structure with some known | |
275 | * good values. | |
276 | */ | |
d6c479e0 | 277 | dbg("initializing slot %s", name); |
1da177e4 LT |
278 | info->power_status = cpci_get_power_status(slot); |
279 | info->attention_status = cpci_get_attention_status(slot); | |
280 | ||
d6c479e0 AC |
281 | dbg("registering slot %s", name); |
282 | status = pci_hp_register(slot->hotplug_slot, bus, i, name); | |
1da177e4 LT |
283 | if (status) { |
284 | err("pci_hp_register failed with error %d", status); | |
d6c479e0 | 285 | goto error_info; |
1da177e4 | 286 | } |
d6c479e0 | 287 | dbg("slot registered with name: %s", slot_name(slot)); |
1da177e4 LT |
288 | |
289 | /* Add slot to our internal list */ | |
43b7d7cf | 290 | down_write(&list_rwsem); |
1da177e4 LT |
291 | list_add(&slot->slot_list, &slot_list); |
292 | slots++; | |
43b7d7cf | 293 | up_write(&list_rwsem); |
1da177e4 LT |
294 | } |
295 | return 0; | |
1da177e4 LT |
296 | error_info: |
297 | kfree(info); | |
298 | error_hpslot: | |
299 | kfree(hotplug_slot); | |
300 | error_slot: | |
301 | kfree(slot); | |
302 | error: | |
303 | return status; | |
304 | } | |
b7fe9434 | 305 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); |
1da177e4 LT |
306 | |
307 | int | |
308 | cpci_hp_unregister_bus(struct pci_bus *bus) | |
309 | { | |
310 | struct slot *slot; | |
bcc488ab SM |
311 | struct slot *tmp; |
312 | int status = 0; | |
1da177e4 | 313 | |
43b7d7cf | 314 | down_write(&list_rwsem); |
bcc488ab | 315 | if (!slots) { |
43b7d7cf | 316 | up_write(&list_rwsem); |
1da177e4 LT |
317 | return -1; |
318 | } | |
bcc488ab SM |
319 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { |
320 | if (slot->bus == bus) { | |
321 | list_del(&slot->slot_list); | |
322 | slots--; | |
323 | ||
d6c479e0 | 324 | dbg("deregistering slot %s", slot_name(slot)); |
1da177e4 | 325 | status = pci_hp_deregister(slot->hotplug_slot); |
bcc488ab | 326 | if (status) { |
1da177e4 LT |
327 | err("pci_hp_deregister failed with error %d", |
328 | status); | |
bcc488ab | 329 | break; |
1da177e4 | 330 | } |
1da177e4 LT |
331 | } |
332 | } | |
43b7d7cf | 333 | up_write(&list_rwsem); |
bcc488ab | 334 | return status; |
1da177e4 | 335 | } |
b7fe9434 | 336 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); |
1da177e4 LT |
337 | |
338 | /* This is the interrupt mode interrupt handler */ | |
339 | static irqreturn_t | |
7d12e780 | 340 | cpci_hp_intr(int irq, void *data) |
1da177e4 LT |
341 | { |
342 | dbg("entered cpci_hp_intr"); | |
343 | ||
344 | /* Check to see if it was our interrupt */ | |
6b4486e2 | 345 | if ((controller->irq_flags & IRQF_SHARED) && |
1da177e4 LT |
346 | !controller->ops->check_irq(controller->dev_id)) { |
347 | dbg("exited cpci_hp_intr, not our interrupt"); | |
348 | return IRQ_NONE; | |
349 | } | |
350 | ||
351 | /* Disable ENUM interrupt */ | |
352 | controller->ops->disable_irq(); | |
353 | ||
354 | /* Trigger processing by the event thread */ | |
0bec2c85 | 355 | wake_up_process(cpci_thread); |
1da177e4 LT |
356 | return IRQ_HANDLED; |
357 | } | |
358 | ||
359 | /* | |
43b7d7cf | 360 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
1da177e4 LT |
361 | * initialization, the system driver shall clear the |
362 | * INS bits of the cold-inserted devices. | |
363 | */ | |
364 | static int | |
bcc488ab | 365 | init_slots(int clear_ins) |
1da177e4 LT |
366 | { |
367 | struct slot *slot; | |
3c78bc61 | 368 | struct pci_dev *dev; |
1da177e4 | 369 | |
66bef8c0 | 370 | dbg("%s - enter", __func__); |
43b7d7cf | 371 | down_read(&list_rwsem); |
bcc488ab | 372 | if (!slots) { |
43b7d7cf | 373 | up_read(&list_rwsem); |
1da177e4 LT |
374 | return -1; |
375 | } | |
bcc488ab | 376 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 377 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab | 378 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
1da177e4 | 379 | dbg("%s - cleared INS for slot %s", |
d6c479e0 | 380 | __func__, slot_name(slot)); |
bcc488ab SM |
381 | dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0)); |
382 | if (dev) { | |
383 | if (update_adapter_status(slot->hotplug_slot, 1)) | |
384 | warn("failure to update adapter file"); | |
385 | if (update_latch_status(slot->hotplug_slot, 1)) | |
386 | warn("failure to update latch file"); | |
387 | slot->dev = dev; | |
1da177e4 LT |
388 | } |
389 | } | |
43b7d7cf | 390 | up_read(&list_rwsem); |
66bef8c0 | 391 | dbg("%s - exit", __func__); |
1da177e4 LT |
392 | return 0; |
393 | } | |
394 | ||
395 | static int | |
396 | check_slots(void) | |
397 | { | |
398 | struct slot *slot; | |
1da177e4 LT |
399 | int extracted; |
400 | int inserted; | |
43b7d7cf | 401 | u16 hs_csr; |
1da177e4 | 402 | |
43b7d7cf | 403 | down_read(&list_rwsem); |
bcc488ab | 404 | if (!slots) { |
43b7d7cf | 405 | up_read(&list_rwsem); |
1da177e4 LT |
406 | err("no slots registered, shutting down"); |
407 | return -1; | |
408 | } | |
409 | extracted = inserted = 0; | |
bcc488ab | 410 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 411 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab SM |
412 | if (cpci_check_and_clear_ins(slot)) { |
413 | /* | |
414 | * Some broken hardware (e.g. PLX 9054AB) asserts | |
415 | * ENUM# twice... | |
416 | */ | |
417 | if (slot->dev) { | |
418 | warn("slot %s already inserted", | |
d6c479e0 | 419 | slot_name(slot)); |
1da177e4 LT |
420 | inserted++; |
421 | continue; | |
422 | } | |
423 | ||
424 | /* Process insertion */ | |
d6c479e0 | 425 | dbg("%s - slot %s inserted", __func__, slot_name(slot)); |
1da177e4 LT |
426 | |
427 | /* GSM, debug */ | |
428 | hs_csr = cpci_get_hs_csr(slot); | |
429 | dbg("%s - slot %s HS_CSR (1) = %04x", | |
d6c479e0 | 430 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
431 | |
432 | /* Configure device */ | |
433 | dbg("%s - configuring slot %s", | |
d6c479e0 | 434 | __func__, slot_name(slot)); |
bcc488ab | 435 | if (cpci_configure_slot(slot)) { |
1da177e4 | 436 | err("%s - could not configure slot %s", |
d6c479e0 | 437 | __func__, slot_name(slot)); |
1da177e4 LT |
438 | continue; |
439 | } | |
440 | dbg("%s - finished configuring slot %s", | |
d6c479e0 | 441 | __func__, slot_name(slot)); |
1da177e4 LT |
442 | |
443 | /* GSM, debug */ | |
444 | hs_csr = cpci_get_hs_csr(slot); | |
445 | dbg("%s - slot %s HS_CSR (2) = %04x", | |
d6c479e0 | 446 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 447 | |
bcc488ab | 448 | if (update_latch_status(slot->hotplug_slot, 1)) |
1da177e4 | 449 | warn("failure to update latch file"); |
1da177e4 | 450 | |
bcc488ab | 451 | if (update_adapter_status(slot->hotplug_slot, 1)) |
1da177e4 | 452 | warn("failure to update adapter file"); |
1da177e4 LT |
453 | |
454 | cpci_led_off(slot); | |
455 | ||
456 | /* GSM, debug */ | |
457 | hs_csr = cpci_get_hs_csr(slot); | |
458 | dbg("%s - slot %s HS_CSR (3) = %04x", | |
d6c479e0 | 459 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
460 | |
461 | inserted++; | |
bcc488ab | 462 | } else if (cpci_check_ext(slot)) { |
1da177e4 LT |
463 | /* Process extraction request */ |
464 | dbg("%s - slot %s extracted", | |
d6c479e0 | 465 | __func__, slot_name(slot)); |
1da177e4 LT |
466 | |
467 | /* GSM, debug */ | |
468 | hs_csr = cpci_get_hs_csr(slot); | |
469 | dbg("%s - slot %s HS_CSR = %04x", | |
d6c479e0 | 470 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 471 | |
bcc488ab | 472 | if (!slot->extracting) { |
656f978f | 473 | if (update_latch_status(slot->hotplug_slot, 0)) |
1da177e4 | 474 | warn("failure to update latch file"); |
656f978f | 475 | |
1da177e4 | 476 | slot->extracting = 1; |
bcc488ab | 477 | atomic_inc(&extracting); |
1da177e4 LT |
478 | } |
479 | extracted++; | |
bcc488ab | 480 | } else if (slot->extracting) { |
43b7d7cf | 481 | hs_csr = cpci_get_hs_csr(slot); |
bcc488ab | 482 | if (hs_csr == 0xffff) { |
43b7d7cf SM |
483 | /* |
484 | * Hmmm, we're likely hosed at this point, should we | |
485 | * bother trying to tell the driver or not? | |
486 | */ | |
487 | err("card in slot %s was improperly removed", | |
d6c479e0 | 488 | slot_name(slot)); |
bcc488ab | 489 | if (update_adapter_status(slot->hotplug_slot, 0)) |
43b7d7cf | 490 | warn("failure to update adapter file"); |
43b7d7cf SM |
491 | slot->extracting = 0; |
492 | atomic_dec(&extracting); | |
493 | } | |
1da177e4 LT |
494 | } |
495 | } | |
43b7d7cf SM |
496 | up_read(&list_rwsem); |
497 | dbg("inserted=%d, extracted=%d, extracting=%d", | |
498 | inserted, extracted, atomic_read(&extracting)); | |
bcc488ab | 499 | if (inserted || extracted) |
1da177e4 | 500 | return extracted; |
bcc488ab | 501 | else if (!atomic_read(&extracting)) { |
1da177e4 LT |
502 | err("cannot find ENUM# source, shutting down"); |
503 | return -1; | |
504 | } | |
43b7d7cf | 505 | return 0; |
1da177e4 LT |
506 | } |
507 | ||
508 | /* This is the interrupt mode worker thread body */ | |
509 | static int | |
510 | event_thread(void *data) | |
511 | { | |
512 | int rc; | |
1da177e4 | 513 | |
66bef8c0 | 514 | dbg("%s - event thread started", __func__); |
bcc488ab | 515 | while (1) { |
1da177e4 | 516 | dbg("event thread sleeping"); |
0bec2c85 SM |
517 | set_current_state(TASK_INTERRUPTIBLE); |
518 | schedule(); | |
519 | if (kthread_should_stop()) | |
1da177e4 | 520 | break; |
43b7d7cf | 521 | do { |
1da177e4 | 522 | rc = check_slots(); |
43b7d7cf | 523 | if (rc > 0) { |
1da177e4 LT |
524 | /* Give userspace a chance to handle extraction */ |
525 | msleep(500); | |
43b7d7cf | 526 | } else if (rc < 0) { |
66bef8c0 | 527 | dbg("%s - error checking slots", __func__); |
1da177e4 | 528 | thread_finished = 1; |
0bec2c85 | 529 | goto out; |
1da177e4 | 530 | } |
0bec2c85 SM |
531 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
532 | if (kthread_should_stop()) | |
bcc488ab | 533 | break; |
1da177e4 LT |
534 | |
535 | /* Re-enable ENUM# interrupt */ | |
66bef8c0 | 536 | dbg("%s - re-enabling irq", __func__); |
1da177e4 LT |
537 | controller->ops->enable_irq(); |
538 | } | |
0bec2c85 | 539 | out: |
1da177e4 LT |
540 | return 0; |
541 | } | |
542 | ||
543 | /* This is the polling mode worker thread body */ | |
544 | static int | |
545 | poll_thread(void *data) | |
546 | { | |
547 | int rc; | |
1da177e4 | 548 | |
bcc488ab | 549 | while (1) { |
0bec2c85 | 550 | if (kthread_should_stop() || signal_pending(current)) |
1da177e4 | 551 | break; |
bcc488ab | 552 | if (controller->ops->query_enum()) { |
43b7d7cf SM |
553 | do { |
554 | rc = check_slots(); | |
bcc488ab | 555 | if (rc > 0) { |
43b7d7cf SM |
556 | /* Give userspace a chance to handle extraction */ |
557 | msleep(500); | |
bcc488ab | 558 | } else if (rc < 0) { |
66bef8c0 | 559 | dbg("%s - error checking slots", __func__); |
43b7d7cf | 560 | thread_finished = 1; |
0bec2c85 | 561 | goto out; |
1da177e4 | 562 | } |
0bec2c85 | 563 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
1da177e4 | 564 | } |
1da177e4 LT |
565 | msleep(100); |
566 | } | |
0bec2c85 | 567 | out: |
1da177e4 LT |
568 | return 0; |
569 | } | |
570 | ||
571 | static int | |
572 | cpci_start_thread(void) | |
573 | { | |
bcc488ab | 574 | if (controller->irq) |
0bec2c85 | 575 | cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd"); |
bcc488ab | 576 | else |
0bec2c85 SM |
577 | cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld"); |
578 | if (IS_ERR(cpci_thread)) { | |
1da177e4 | 579 | err("Can't start up our thread"); |
0bec2c85 | 580 | return PTR_ERR(cpci_thread); |
1da177e4 | 581 | } |
0bec2c85 | 582 | thread_finished = 0; |
1da177e4 LT |
583 | return 0; |
584 | } | |
585 | ||
586 | static void | |
587 | cpci_stop_thread(void) | |
588 | { | |
0bec2c85 | 589 | kthread_stop(cpci_thread); |
1da177e4 | 590 | thread_finished = 1; |
1da177e4 LT |
591 | } |
592 | ||
593 | int | |
594 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) | |
595 | { | |
596 | int status = 0; | |
597 | ||
bcc488ab SM |
598 | if (controller) |
599 | return -1; | |
600 | if (!(new_controller && new_controller->ops)) | |
601 | return -EINVAL; | |
602 | if (new_controller->irq) { | |
603 | if (!(new_controller->ops->enable_irq && | |
604 | new_controller->ops->disable_irq)) | |
605 | status = -EINVAL; | |
606 | if (request_irq(new_controller->irq, | |
607 | cpci_hp_intr, | |
608 | new_controller->irq_flags, | |
609 | MY_NAME, | |
610 | new_controller->dev_id)) { | |
611 | err("Can't get irq %d for the hotplug cPCI controller", | |
612 | new_controller->irq); | |
613 | status = -ENODEV; | |
1da177e4 | 614 | } |
bcc488ab | 615 | dbg("%s - acquired controller irq %d", |
66bef8c0 | 616 | __func__, new_controller->irq); |
1da177e4 | 617 | } |
bcc488ab SM |
618 | if (!status) |
619 | controller = new_controller; | |
1da177e4 LT |
620 | return status; |
621 | } | |
b7fe9434 | 622 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); |
1da177e4 | 623 | |
bcc488ab SM |
624 | static void |
625 | cleanup_slots(void) | |
626 | { | |
627 | struct slot *slot; | |
628 | struct slot *tmp; | |
629 | ||
630 | /* | |
631 | * Unregister all of our slots with the pci_hotplug subsystem, | |
632 | * and free up all memory that we had allocated. | |
633 | */ | |
634 | down_write(&list_rwsem); | |
635 | if (!slots) | |
636 | goto cleanup_null; | |
637 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { | |
638 | list_del(&slot->slot_list); | |
639 | pci_hp_deregister(slot->hotplug_slot); | |
640 | } | |
641 | cleanup_null: | |
642 | up_write(&list_rwsem); | |
643 | return; | |
644 | } | |
645 | ||
1da177e4 LT |
646 | int |
647 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
648 | { | |
649 | int status = 0; | |
650 | ||
bcc488ab SM |
651 | if (controller) { |
652 | if (!thread_finished) | |
1da177e4 | 653 | cpci_stop_thread(); |
bcc488ab | 654 | if (controller->irq) |
1da177e4 | 655 | free_irq(controller->irq, controller->dev_id); |
1da177e4 | 656 | controller = NULL; |
bcc488ab SM |
657 | cleanup_slots(); |
658 | } else | |
1da177e4 | 659 | status = -ENODEV; |
1da177e4 LT |
660 | return status; |
661 | } | |
b7fe9434 | 662 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); |
1da177e4 LT |
663 | |
664 | int | |
665 | cpci_hp_start(void) | |
666 | { | |
667 | static int first = 1; | |
668 | int status; | |
669 | ||
66bef8c0 | 670 | dbg("%s - enter", __func__); |
bcc488ab | 671 | if (!controller) |
1da177e4 | 672 | return -ENODEV; |
1da177e4 | 673 | |
43b7d7cf | 674 | down_read(&list_rwsem); |
bcc488ab | 675 | if (list_empty(&slot_list)) { |
43b7d7cf | 676 | up_read(&list_rwsem); |
1da177e4 LT |
677 | return -ENODEV; |
678 | } | |
43b7d7cf | 679 | up_read(&list_rwsem); |
1da177e4 | 680 | |
bcc488ab SM |
681 | status = init_slots(first); |
682 | if (first) | |
1da177e4 | 683 | first = 0; |
bcc488ab SM |
684 | if (status) |
685 | return status; | |
1da177e4 LT |
686 | |
687 | status = cpci_start_thread(); | |
bcc488ab | 688 | if (status) |
1da177e4 | 689 | return status; |
66bef8c0 | 690 | dbg("%s - thread started", __func__); |
1da177e4 | 691 | |
bcc488ab | 692 | if (controller->irq) { |
1da177e4 | 693 | /* Start enum interrupt processing */ |
66bef8c0 | 694 | dbg("%s - enabling irq", __func__); |
1da177e4 LT |
695 | controller->ops->enable_irq(); |
696 | } | |
66bef8c0 | 697 | dbg("%s - exit", __func__); |
1da177e4 LT |
698 | return 0; |
699 | } | |
b7fe9434 | 700 | EXPORT_SYMBOL_GPL(cpci_hp_start); |
1da177e4 LT |
701 | |
702 | int | |
703 | cpci_hp_stop(void) | |
704 | { | |
bcc488ab | 705 | if (!controller) |
1da177e4 | 706 | return -ENODEV; |
bcc488ab | 707 | if (controller->irq) { |
1da177e4 | 708 | /* Stop enum interrupt processing */ |
66bef8c0 | 709 | dbg("%s - disabling irq", __func__); |
1da177e4 LT |
710 | controller->ops->disable_irq(); |
711 | } | |
712 | cpci_stop_thread(); | |
713 | return 0; | |
714 | } | |
b7fe9434 | 715 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |
1da177e4 | 716 | |
1da177e4 LT |
717 | int __init |
718 | cpci_hotplug_init(int debug) | |
719 | { | |
1da177e4 | 720 | cpci_debug = debug; |
1da177e4 LT |
721 | return 0; |
722 | } |