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> | |
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) \ |
ff3ce480 BS |
48 | printk(KERN_DEBUG "%s: " format "\n", \ |
49 | MY_NAME, ## arg); \ | |
bcc488ab | 50 | } while (0) |
ff3ce480 BS |
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) | |
1da177e4 LT |
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); | |
3c78bc61 RD |
68 | static int get_power_status(struct hotplug_slot *slot, u8 *value); |
69 | static int get_attention_status(struct hotplug_slot *slot, u8 *value); | |
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)); |
79e50e72 QL |
128 | retval = cpci_unconfigure_slot(slot); |
129 | if (retval) { | |
1da177e4 | 130 | err("%s - could not unconfigure slot %s", |
d6c479e0 | 131 | __func__, slot_name(slot)); |
bcc488ab | 132 | goto disable_error; |
1da177e4 | 133 | } |
d6c479e0 | 134 | dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot)); |
1da177e4 LT |
135 | |
136 | /* Clear EXT (by setting it) */ | |
bcc488ab | 137 | if (cpci_clear_ext(slot)) { |
1da177e4 | 138 | err("%s - could not clear EXT for slot %s", |
d6c479e0 | 139 | __func__, slot_name(slot)); |
1da177e4 | 140 | retval = -ENODEV; |
bcc488ab | 141 | goto disable_error; |
1da177e4 LT |
142 | } |
143 | cpci_led_on(slot); | |
144 | ||
79e50e72 QL |
145 | if (controller->ops->set_power) { |
146 | retval = controller->ops->set_power(slot, 0); | |
147 | if (retval) | |
bcc488ab | 148 | goto disable_error; |
79e50e72 | 149 | } |
1da177e4 | 150 | |
bcc488ab | 151 | if (update_adapter_status(slot->hotplug_slot, 0)) |
1da177e4 | 152 | warn("failure to update adapter file"); |
1da177e4 | 153 | |
bcc488ab | 154 | if (slot->extracting) { |
43b7d7cf SM |
155 | slot->extracting = 0; |
156 | atomic_dec(&extracting); | |
157 | } | |
bcc488ab SM |
158 | disable_error: |
159 | up_write(&list_rwsem); | |
1da177e4 LT |
160 | return retval; |
161 | } | |
162 | ||
163 | static u8 | |
164 | cpci_get_power_status(struct slot *slot) | |
165 | { | |
166 | u8 power = 1; | |
167 | ||
bcc488ab | 168 | if (controller->ops->get_power) |
1da177e4 | 169 | power = controller->ops->get_power(slot); |
1da177e4 LT |
170 | return power; |
171 | } | |
172 | ||
173 | static int | |
3c78bc61 | 174 | get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) |
1da177e4 LT |
175 | { |
176 | struct slot *slot = hotplug_slot->private; | |
177 | ||
178 | *value = cpci_get_power_status(slot); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static int | |
3c78bc61 | 183 | get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
1da177e4 LT |
184 | { |
185 | struct slot *slot = hotplug_slot->private; | |
186 | ||
187 | *value = cpci_get_attention_status(slot); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int | |
192 | set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
193 | { | |
194 | return cpci_set_attention_status(hotplug_slot->private, status); | |
195 | } | |
196 | ||
43b7d7cf | 197 | static int |
3c78bc61 | 198 | get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) |
43b7d7cf SM |
199 | { |
200 | *value = hotplug_slot->info->adapter_status; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int | |
3c78bc61 | 205 | get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) |
43b7d7cf SM |
206 | { |
207 | *value = hotplug_slot->info->latch_status; | |
208 | return 0; | |
209 | } | |
210 | ||
1da177e4 LT |
211 | static void release_slot(struct hotplug_slot *hotplug_slot) |
212 | { | |
213 | struct slot *slot = hotplug_slot->private; | |
214 | ||
215 | kfree(slot->hotplug_slot->info); | |
1da177e4 | 216 | kfree(slot->hotplug_slot); |
17f14b51 | 217 | pci_dev_put(slot->dev); |
1da177e4 LT |
218 | kfree(slot); |
219 | } | |
220 | ||
221 | #define SLOT_NAME_SIZE 6 | |
1da177e4 LT |
222 | |
223 | int | |
224 | cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) | |
225 | { | |
226 | struct slot *slot; | |
227 | struct hotplug_slot *hotplug_slot; | |
228 | struct hotplug_slot_info *info; | |
d6c479e0 | 229 | char name[SLOT_NAME_SIZE]; |
83d05710 | 230 | int status; |
1da177e4 LT |
231 | int i; |
232 | ||
bcc488ab | 233 | if (!(controller && bus)) |
1da177e4 | 234 | return -ENODEV; |
1da177e4 LT |
235 | |
236 | /* | |
237 | * Create a structure for each slot, and register that slot | |
238 | * with the pci_hotplug subsystem. | |
239 | */ | |
240 | for (i = first; i <= last; ++i) { | |
ff3ce480 | 241 | slot = kzalloc(sizeof(struct slot), GFP_KERNEL); |
83d05710 JL |
242 | if (!slot) { |
243 | status = -ENOMEM; | |
1da177e4 | 244 | goto error; |
83d05710 | 245 | } |
1da177e4 LT |
246 | |
247 | hotplug_slot = | |
ff3ce480 | 248 | kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL); |
83d05710 JL |
249 | if (!hotplug_slot) { |
250 | status = -ENOMEM; | |
1da177e4 | 251 | goto error_slot; |
83d05710 | 252 | } |
1da177e4 LT |
253 | slot->hotplug_slot = hotplug_slot; |
254 | ||
ff3ce480 | 255 | info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL); |
83d05710 JL |
256 | if (!info) { |
257 | status = -ENOMEM; | |
1da177e4 | 258 | goto error_hpslot; |
83d05710 | 259 | } |
1da177e4 LT |
260 | hotplug_slot->info = info; |
261 | ||
1da177e4 LT |
262 | slot->bus = bus; |
263 | slot->number = i; | |
264 | slot->devfn = PCI_DEVFN(i, 0); | |
265 | ||
d6c479e0 AC |
266 | snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i); |
267 | ||
1da177e4 LT |
268 | hotplug_slot->private = slot; |
269 | hotplug_slot->release = &release_slot; | |
1da177e4 LT |
270 | hotplug_slot->ops = &cpci_hotplug_slot_ops; |
271 | ||
272 | /* | |
273 | * Initialize the slot info structure with some known | |
274 | * good values. | |
275 | */ | |
d6c479e0 | 276 | dbg("initializing slot %s", name); |
1da177e4 LT |
277 | info->power_status = cpci_get_power_status(slot); |
278 | info->attention_status = cpci_get_attention_status(slot); | |
279 | ||
d6c479e0 AC |
280 | dbg("registering slot %s", name); |
281 | status = pci_hp_register(slot->hotplug_slot, bus, i, name); | |
1da177e4 LT |
282 | if (status) { |
283 | err("pci_hp_register failed with error %d", status); | |
d6c479e0 | 284 | goto error_info; |
1da177e4 | 285 | } |
d6c479e0 | 286 | dbg("slot registered with name: %s", slot_name(slot)); |
1da177e4 LT |
287 | |
288 | /* Add slot to our internal list */ | |
43b7d7cf | 289 | down_write(&list_rwsem); |
1da177e4 LT |
290 | list_add(&slot->slot_list, &slot_list); |
291 | slots++; | |
43b7d7cf | 292 | up_write(&list_rwsem); |
1da177e4 LT |
293 | } |
294 | return 0; | |
1da177e4 LT |
295 | error_info: |
296 | kfree(info); | |
297 | error_hpslot: | |
298 | kfree(hotplug_slot); | |
299 | error_slot: | |
300 | kfree(slot); | |
301 | error: | |
302 | return status; | |
303 | } | |
b7fe9434 | 304 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); |
1da177e4 LT |
305 | |
306 | int | |
307 | cpci_hp_unregister_bus(struct pci_bus *bus) | |
308 | { | |
309 | struct slot *slot; | |
bcc488ab SM |
310 | struct slot *tmp; |
311 | int status = 0; | |
1da177e4 | 312 | |
43b7d7cf | 313 | down_write(&list_rwsem); |
bcc488ab | 314 | if (!slots) { |
43b7d7cf | 315 | up_write(&list_rwsem); |
1da177e4 LT |
316 | return -1; |
317 | } | |
bcc488ab SM |
318 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { |
319 | if (slot->bus == bus) { | |
320 | list_del(&slot->slot_list); | |
321 | slots--; | |
322 | ||
d6c479e0 | 323 | dbg("deregistering slot %s", slot_name(slot)); |
1da177e4 | 324 | status = pci_hp_deregister(slot->hotplug_slot); |
bcc488ab | 325 | if (status) { |
1da177e4 LT |
326 | err("pci_hp_deregister failed with error %d", |
327 | status); | |
bcc488ab | 328 | break; |
1da177e4 | 329 | } |
1da177e4 LT |
330 | } |
331 | } | |
43b7d7cf | 332 | up_write(&list_rwsem); |
bcc488ab | 333 | return status; |
1da177e4 | 334 | } |
b7fe9434 | 335 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); |
1da177e4 LT |
336 | |
337 | /* This is the interrupt mode interrupt handler */ | |
338 | static irqreturn_t | |
7d12e780 | 339 | cpci_hp_intr(int irq, void *data) |
1da177e4 LT |
340 | { |
341 | dbg("entered cpci_hp_intr"); | |
342 | ||
343 | /* Check to see if it was our interrupt */ | |
6b4486e2 | 344 | if ((controller->irq_flags & IRQF_SHARED) && |
1da177e4 LT |
345 | !controller->ops->check_irq(controller->dev_id)) { |
346 | dbg("exited cpci_hp_intr, not our interrupt"); | |
347 | return IRQ_NONE; | |
348 | } | |
349 | ||
350 | /* Disable ENUM interrupt */ | |
351 | controller->ops->disable_irq(); | |
352 | ||
353 | /* Trigger processing by the event thread */ | |
0bec2c85 | 354 | wake_up_process(cpci_thread); |
1da177e4 LT |
355 | return IRQ_HANDLED; |
356 | } | |
357 | ||
358 | /* | |
43b7d7cf | 359 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
1da177e4 LT |
360 | * initialization, the system driver shall clear the |
361 | * INS bits of the cold-inserted devices. | |
362 | */ | |
363 | static int | |
bcc488ab | 364 | init_slots(int clear_ins) |
1da177e4 LT |
365 | { |
366 | struct slot *slot; | |
3c78bc61 | 367 | struct pci_dev *dev; |
1da177e4 | 368 | |
66bef8c0 | 369 | dbg("%s - enter", __func__); |
43b7d7cf | 370 | down_read(&list_rwsem); |
bcc488ab | 371 | if (!slots) { |
43b7d7cf | 372 | up_read(&list_rwsem); |
1da177e4 LT |
373 | return -1; |
374 | } | |
bcc488ab | 375 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 376 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab | 377 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
1da177e4 | 378 | dbg("%s - cleared INS for slot %s", |
d6c479e0 | 379 | __func__, slot_name(slot)); |
bcc488ab SM |
380 | dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0)); |
381 | if (dev) { | |
382 | if (update_adapter_status(slot->hotplug_slot, 1)) | |
383 | warn("failure to update adapter file"); | |
384 | if (update_latch_status(slot->hotplug_slot, 1)) | |
385 | warn("failure to update latch file"); | |
386 | slot->dev = dev; | |
1da177e4 LT |
387 | } |
388 | } | |
43b7d7cf | 389 | up_read(&list_rwsem); |
66bef8c0 | 390 | dbg("%s - exit", __func__); |
1da177e4 LT |
391 | return 0; |
392 | } | |
393 | ||
394 | static int | |
395 | check_slots(void) | |
396 | { | |
397 | struct slot *slot; | |
1da177e4 LT |
398 | int extracted; |
399 | int inserted; | |
43b7d7cf | 400 | u16 hs_csr; |
1da177e4 | 401 | |
43b7d7cf | 402 | down_read(&list_rwsem); |
bcc488ab | 403 | if (!slots) { |
43b7d7cf | 404 | up_read(&list_rwsem); |
1da177e4 LT |
405 | err("no slots registered, shutting down"); |
406 | return -1; | |
407 | } | |
408 | extracted = inserted = 0; | |
bcc488ab | 409 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 410 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab SM |
411 | if (cpci_check_and_clear_ins(slot)) { |
412 | /* | |
413 | * Some broken hardware (e.g. PLX 9054AB) asserts | |
414 | * ENUM# twice... | |
415 | */ | |
416 | if (slot->dev) { | |
417 | warn("slot %s already inserted", | |
d6c479e0 | 418 | slot_name(slot)); |
1da177e4 LT |
419 | inserted++; |
420 | continue; | |
421 | } | |
422 | ||
423 | /* Process insertion */ | |
d6c479e0 | 424 | dbg("%s - slot %s inserted", __func__, slot_name(slot)); |
1da177e4 LT |
425 | |
426 | /* GSM, debug */ | |
427 | hs_csr = cpci_get_hs_csr(slot); | |
428 | dbg("%s - slot %s HS_CSR (1) = %04x", | |
d6c479e0 | 429 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
430 | |
431 | /* Configure device */ | |
432 | dbg("%s - configuring slot %s", | |
d6c479e0 | 433 | __func__, slot_name(slot)); |
bcc488ab | 434 | if (cpci_configure_slot(slot)) { |
1da177e4 | 435 | err("%s - could not configure slot %s", |
d6c479e0 | 436 | __func__, slot_name(slot)); |
1da177e4 LT |
437 | continue; |
438 | } | |
439 | dbg("%s - finished configuring slot %s", | |
d6c479e0 | 440 | __func__, slot_name(slot)); |
1da177e4 LT |
441 | |
442 | /* GSM, debug */ | |
443 | hs_csr = cpci_get_hs_csr(slot); | |
444 | dbg("%s - slot %s HS_CSR (2) = %04x", | |
d6c479e0 | 445 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 446 | |
bcc488ab | 447 | if (update_latch_status(slot->hotplug_slot, 1)) |
1da177e4 | 448 | warn("failure to update latch file"); |
1da177e4 | 449 | |
bcc488ab | 450 | if (update_adapter_status(slot->hotplug_slot, 1)) |
1da177e4 | 451 | warn("failure to update adapter file"); |
1da177e4 LT |
452 | |
453 | cpci_led_off(slot); | |
454 | ||
455 | /* GSM, debug */ | |
456 | hs_csr = cpci_get_hs_csr(slot); | |
457 | dbg("%s - slot %s HS_CSR (3) = %04x", | |
d6c479e0 | 458 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
459 | |
460 | inserted++; | |
bcc488ab | 461 | } else if (cpci_check_ext(slot)) { |
1da177e4 LT |
462 | /* Process extraction request */ |
463 | dbg("%s - slot %s extracted", | |
d6c479e0 | 464 | __func__, slot_name(slot)); |
1da177e4 LT |
465 | |
466 | /* GSM, debug */ | |
467 | hs_csr = cpci_get_hs_csr(slot); | |
468 | dbg("%s - slot %s HS_CSR = %04x", | |
d6c479e0 | 469 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 470 | |
bcc488ab | 471 | if (!slot->extracting) { |
656f978f | 472 | if (update_latch_status(slot->hotplug_slot, 0)) |
1da177e4 | 473 | warn("failure to update latch file"); |
656f978f | 474 | |
1da177e4 | 475 | slot->extracting = 1; |
bcc488ab | 476 | atomic_inc(&extracting); |
1da177e4 LT |
477 | } |
478 | extracted++; | |
bcc488ab | 479 | } else if (slot->extracting) { |
43b7d7cf | 480 | hs_csr = cpci_get_hs_csr(slot); |
bcc488ab | 481 | if (hs_csr == 0xffff) { |
43b7d7cf SM |
482 | /* |
483 | * Hmmm, we're likely hosed at this point, should we | |
484 | * bother trying to tell the driver or not? | |
485 | */ | |
486 | err("card in slot %s was improperly removed", | |
d6c479e0 | 487 | slot_name(slot)); |
bcc488ab | 488 | if (update_adapter_status(slot->hotplug_slot, 0)) |
43b7d7cf | 489 | warn("failure to update adapter file"); |
43b7d7cf SM |
490 | slot->extracting = 0; |
491 | atomic_dec(&extracting); | |
492 | } | |
1da177e4 LT |
493 | } |
494 | } | |
43b7d7cf SM |
495 | up_read(&list_rwsem); |
496 | dbg("inserted=%d, extracted=%d, extracting=%d", | |
497 | inserted, extracted, atomic_read(&extracting)); | |
bcc488ab | 498 | if (inserted || extracted) |
1da177e4 | 499 | return extracted; |
bcc488ab | 500 | else if (!atomic_read(&extracting)) { |
1da177e4 LT |
501 | err("cannot find ENUM# source, shutting down"); |
502 | return -1; | |
503 | } | |
43b7d7cf | 504 | return 0; |
1da177e4 LT |
505 | } |
506 | ||
507 | /* This is the interrupt mode worker thread body */ | |
508 | static int | |
509 | event_thread(void *data) | |
510 | { | |
511 | int rc; | |
1da177e4 | 512 | |
66bef8c0 | 513 | dbg("%s - event thread started", __func__); |
bcc488ab | 514 | while (1) { |
1da177e4 | 515 | dbg("event thread sleeping"); |
0bec2c85 SM |
516 | set_current_state(TASK_INTERRUPTIBLE); |
517 | schedule(); | |
518 | if (kthread_should_stop()) | |
1da177e4 | 519 | break; |
43b7d7cf | 520 | do { |
1da177e4 | 521 | rc = check_slots(); |
43b7d7cf | 522 | if (rc > 0) { |
1da177e4 LT |
523 | /* Give userspace a chance to handle extraction */ |
524 | msleep(500); | |
43b7d7cf | 525 | } else if (rc < 0) { |
66bef8c0 | 526 | dbg("%s - error checking slots", __func__); |
1da177e4 | 527 | thread_finished = 1; |
0bec2c85 | 528 | goto out; |
1da177e4 | 529 | } |
0bec2c85 SM |
530 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
531 | if (kthread_should_stop()) | |
bcc488ab | 532 | break; |
1da177e4 LT |
533 | |
534 | /* Re-enable ENUM# interrupt */ | |
66bef8c0 | 535 | dbg("%s - re-enabling irq", __func__); |
1da177e4 LT |
536 | controller->ops->enable_irq(); |
537 | } | |
0bec2c85 | 538 | out: |
1da177e4 LT |
539 | return 0; |
540 | } | |
541 | ||
542 | /* This is the polling mode worker thread body */ | |
543 | static int | |
544 | poll_thread(void *data) | |
545 | { | |
546 | int rc; | |
1da177e4 | 547 | |
bcc488ab | 548 | while (1) { |
0bec2c85 | 549 | if (kthread_should_stop() || signal_pending(current)) |
1da177e4 | 550 | break; |
bcc488ab | 551 | if (controller->ops->query_enum()) { |
43b7d7cf SM |
552 | do { |
553 | rc = check_slots(); | |
bcc488ab | 554 | if (rc > 0) { |
43b7d7cf SM |
555 | /* Give userspace a chance to handle extraction */ |
556 | msleep(500); | |
bcc488ab | 557 | } else if (rc < 0) { |
66bef8c0 | 558 | dbg("%s - error checking slots", __func__); |
43b7d7cf | 559 | thread_finished = 1; |
0bec2c85 | 560 | goto out; |
1da177e4 | 561 | } |
0bec2c85 | 562 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
1da177e4 | 563 | } |
1da177e4 LT |
564 | msleep(100); |
565 | } | |
0bec2c85 | 566 | out: |
1da177e4 LT |
567 | return 0; |
568 | } | |
569 | ||
570 | static int | |
571 | cpci_start_thread(void) | |
572 | { | |
bcc488ab | 573 | if (controller->irq) |
0bec2c85 | 574 | cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd"); |
bcc488ab | 575 | else |
0bec2c85 SM |
576 | cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld"); |
577 | if (IS_ERR(cpci_thread)) { | |
1da177e4 | 578 | err("Can't start up our thread"); |
0bec2c85 | 579 | return PTR_ERR(cpci_thread); |
1da177e4 | 580 | } |
0bec2c85 | 581 | thread_finished = 0; |
1da177e4 LT |
582 | return 0; |
583 | } | |
584 | ||
585 | static void | |
586 | cpci_stop_thread(void) | |
587 | { | |
0bec2c85 | 588 | kthread_stop(cpci_thread); |
1da177e4 | 589 | thread_finished = 1; |
1da177e4 LT |
590 | } |
591 | ||
592 | int | |
593 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) | |
594 | { | |
595 | int status = 0; | |
596 | ||
bcc488ab SM |
597 | if (controller) |
598 | return -1; | |
599 | if (!(new_controller && new_controller->ops)) | |
600 | return -EINVAL; | |
601 | if (new_controller->irq) { | |
602 | if (!(new_controller->ops->enable_irq && | |
603 | new_controller->ops->disable_irq)) | |
604 | status = -EINVAL; | |
605 | if (request_irq(new_controller->irq, | |
606 | cpci_hp_intr, | |
607 | new_controller->irq_flags, | |
608 | MY_NAME, | |
609 | new_controller->dev_id)) { | |
610 | err("Can't get irq %d for the hotplug cPCI controller", | |
611 | new_controller->irq); | |
612 | status = -ENODEV; | |
1da177e4 | 613 | } |
bcc488ab | 614 | dbg("%s - acquired controller irq %d", |
66bef8c0 | 615 | __func__, new_controller->irq); |
1da177e4 | 616 | } |
bcc488ab SM |
617 | if (!status) |
618 | controller = new_controller; | |
1da177e4 LT |
619 | return status; |
620 | } | |
b7fe9434 | 621 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); |
1da177e4 | 622 | |
bcc488ab SM |
623 | static void |
624 | cleanup_slots(void) | |
625 | { | |
626 | struct slot *slot; | |
627 | struct slot *tmp; | |
628 | ||
629 | /* | |
630 | * Unregister all of our slots with the pci_hotplug subsystem, | |
631 | * and free up all memory that we had allocated. | |
632 | */ | |
633 | down_write(&list_rwsem); | |
634 | if (!slots) | |
635 | goto cleanup_null; | |
636 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { | |
637 | list_del(&slot->slot_list); | |
638 | pci_hp_deregister(slot->hotplug_slot); | |
639 | } | |
640 | cleanup_null: | |
641 | up_write(&list_rwsem); | |
642 | return; | |
643 | } | |
644 | ||
1da177e4 LT |
645 | int |
646 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
647 | { | |
648 | int status = 0; | |
649 | ||
bcc488ab SM |
650 | if (controller) { |
651 | if (!thread_finished) | |
1da177e4 | 652 | cpci_stop_thread(); |
bcc488ab | 653 | if (controller->irq) |
1da177e4 | 654 | free_irq(controller->irq, controller->dev_id); |
1da177e4 | 655 | controller = NULL; |
bcc488ab SM |
656 | cleanup_slots(); |
657 | } else | |
1da177e4 | 658 | status = -ENODEV; |
1da177e4 LT |
659 | return status; |
660 | } | |
b7fe9434 | 661 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); |
1da177e4 LT |
662 | |
663 | int | |
664 | cpci_hp_start(void) | |
665 | { | |
666 | static int first = 1; | |
667 | int status; | |
668 | ||
66bef8c0 | 669 | dbg("%s - enter", __func__); |
bcc488ab | 670 | if (!controller) |
1da177e4 | 671 | return -ENODEV; |
1da177e4 | 672 | |
43b7d7cf | 673 | down_read(&list_rwsem); |
bcc488ab | 674 | if (list_empty(&slot_list)) { |
43b7d7cf | 675 | up_read(&list_rwsem); |
1da177e4 LT |
676 | return -ENODEV; |
677 | } | |
43b7d7cf | 678 | up_read(&list_rwsem); |
1da177e4 | 679 | |
bcc488ab SM |
680 | status = init_slots(first); |
681 | if (first) | |
1da177e4 | 682 | first = 0; |
bcc488ab SM |
683 | if (status) |
684 | return status; | |
1da177e4 LT |
685 | |
686 | status = cpci_start_thread(); | |
bcc488ab | 687 | if (status) |
1da177e4 | 688 | return status; |
66bef8c0 | 689 | dbg("%s - thread started", __func__); |
1da177e4 | 690 | |
bcc488ab | 691 | if (controller->irq) { |
1da177e4 | 692 | /* Start enum interrupt processing */ |
66bef8c0 | 693 | dbg("%s - enabling irq", __func__); |
1da177e4 LT |
694 | controller->ops->enable_irq(); |
695 | } | |
66bef8c0 | 696 | dbg("%s - exit", __func__); |
1da177e4 LT |
697 | return 0; |
698 | } | |
b7fe9434 | 699 | EXPORT_SYMBOL_GPL(cpci_hp_start); |
1da177e4 LT |
700 | |
701 | int | |
702 | cpci_hp_stop(void) | |
703 | { | |
bcc488ab | 704 | if (!controller) |
1da177e4 | 705 | return -ENODEV; |
bcc488ab | 706 | if (controller->irq) { |
1da177e4 | 707 | /* Stop enum interrupt processing */ |
66bef8c0 | 708 | dbg("%s - disabling irq", __func__); |
1da177e4 LT |
709 | controller->ops->disable_irq(); |
710 | } | |
711 | cpci_stop_thread(); | |
712 | return 0; | |
713 | } | |
b7fe9434 | 714 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |
1da177e4 | 715 | |
1da177e4 LT |
716 | int __init |
717 | cpci_hotplug_init(int debug) | |
718 | { | |
1da177e4 | 719 | cpci_debug = debug; |
1da177e4 LT |
720 | return 0; |
721 | } |