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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> | |
35 | #include <linux/smp_lock.h> | |
43b7d7cf | 36 | #include <asm/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) \ |
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; | |
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); | |
69 | static int get_power_status(struct hotplug_slot *slot, u8 * value); | |
70 | static int get_attention_status(struct hotplug_slot *slot, u8 * value); | |
43b7d7cf SM |
71 | static int get_adapter_status(struct hotplug_slot *slot, u8 * value); |
72 | static int get_latch_status(struct hotplug_slot *slot, u8 * value); | |
1da177e4 LT |
73 | |
74 | static struct hotplug_slot_ops cpci_hotplug_slot_ops = { | |
75 | .owner = THIS_MODULE, | |
76 | .enable_slot = enable_slot, | |
77 | .disable_slot = disable_slot, | |
78 | .set_attention_status = set_attention_status, | |
79 | .get_power_status = get_power_status, | |
80 | .get_attention_status = get_attention_status, | |
43b7d7cf SM |
81 | .get_adapter_status = get_adapter_status, |
82 | .get_latch_status = get_latch_status, | |
1da177e4 LT |
83 | }; |
84 | ||
85 | static int | |
86 | update_latch_status(struct hotplug_slot *hotplug_slot, u8 value) | |
87 | { | |
88 | struct hotplug_slot_info info; | |
89 | ||
90 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
91 | info.latch_status = value; | |
92 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
93 | } | |
94 | ||
95 | static int | |
96 | update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value) | |
97 | { | |
98 | struct hotplug_slot_info info; | |
99 | ||
100 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); | |
101 | info.adapter_status = value; | |
102 | return pci_hp_change_slot_info(hotplug_slot, &info); | |
103 | } | |
104 | ||
105 | static int | |
106 | enable_slot(struct hotplug_slot *hotplug_slot) | |
107 | { | |
108 | struct slot *slot = hotplug_slot->private; | |
109 | int retval = 0; | |
110 | ||
d6c479e0 | 111 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
1da177e4 | 112 | |
bcc488ab | 113 | if (controller->ops->set_power) |
1da177e4 | 114 | retval = controller->ops->set_power(slot, 1); |
1da177e4 LT |
115 | return retval; |
116 | } | |
117 | ||
118 | static int | |
119 | disable_slot(struct hotplug_slot *hotplug_slot) | |
120 | { | |
121 | struct slot *slot = hotplug_slot->private; | |
122 | int retval = 0; | |
123 | ||
d6c479e0 | 124 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
1da177e4 | 125 | |
bcc488ab SM |
126 | down_write(&list_rwsem); |
127 | ||
1da177e4 | 128 | /* Unconfigure device */ |
d6c479e0 | 129 | dbg("%s - unconfiguring slot %s", __func__, slot_name(slot)); |
bcc488ab | 130 | if ((retval = cpci_unconfigure_slot(slot))) { |
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 | ||
bcc488ab SM |
146 | if (controller->ops->set_power) |
147 | if ((retval = controller->ops->set_power(slot, 0))) | |
148 | goto disable_error; | |
1da177e4 | 149 | |
bcc488ab | 150 | if (update_adapter_status(slot->hotplug_slot, 0)) |
1da177e4 | 151 | warn("failure to update adapter file"); |
1da177e4 | 152 | |
bcc488ab | 153 | if (slot->extracting) { |
43b7d7cf SM |
154 | slot->extracting = 0; |
155 | atomic_dec(&extracting); | |
156 | } | |
bcc488ab SM |
157 | disable_error: |
158 | up_write(&list_rwsem); | |
1da177e4 LT |
159 | return retval; |
160 | } | |
161 | ||
162 | static u8 | |
163 | cpci_get_power_status(struct slot *slot) | |
164 | { | |
165 | u8 power = 1; | |
166 | ||
bcc488ab | 167 | if (controller->ops->get_power) |
1da177e4 | 168 | power = controller->ops->get_power(slot); |
1da177e4 LT |
169 | return power; |
170 | } | |
171 | ||
172 | static int | |
173 | get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
174 | { | |
175 | struct slot *slot = hotplug_slot->private; | |
176 | ||
177 | *value = cpci_get_power_status(slot); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int | |
182 | get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
183 | { | |
184 | struct slot *slot = hotplug_slot->private; | |
185 | ||
186 | *value = cpci_get_attention_status(slot); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static int | |
191 | set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) | |
192 | { | |
193 | return cpci_set_attention_status(hotplug_slot->private, status); | |
194 | } | |
195 | ||
43b7d7cf SM |
196 | static int |
197 | get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
198 | { | |
199 | *value = hotplug_slot->info->adapter_status; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int | |
204 | get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value) | |
205 | { | |
206 | *value = hotplug_slot->info->latch_status; | |
207 | return 0; | |
208 | } | |
209 | ||
1da177e4 LT |
210 | static void release_slot(struct hotplug_slot *hotplug_slot) |
211 | { | |
212 | struct slot *slot = hotplug_slot->private; | |
213 | ||
214 | kfree(slot->hotplug_slot->info); | |
1da177e4 | 215 | kfree(slot->hotplug_slot); |
03e49d40 SM |
216 | if (slot->dev) |
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]; |
1da177e4 LT |
230 | int status = -ENOMEM; |
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) { | |
f5afe806 | 241 | slot = kzalloc(sizeof (struct slot), GFP_KERNEL); |
1da177e4 LT |
242 | if (!slot) |
243 | goto error; | |
1da177e4 LT |
244 | |
245 | hotplug_slot = | |
f5afe806 | 246 | kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL); |
1da177e4 LT |
247 | if (!hotplug_slot) |
248 | goto error_slot; | |
1da177e4 LT |
249 | slot->hotplug_slot = hotplug_slot; |
250 | ||
f5afe806 | 251 | info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); |
1da177e4 LT |
252 | if (!info) |
253 | goto error_hpslot; | |
1da177e4 LT |
254 | hotplug_slot->info = info; |
255 | ||
1da177e4 LT |
256 | slot->bus = bus; |
257 | slot->number = i; | |
258 | slot->devfn = PCI_DEVFN(i, 0); | |
259 | ||
d6c479e0 AC |
260 | snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i); |
261 | ||
1da177e4 LT |
262 | hotplug_slot->private = slot; |
263 | hotplug_slot->release = &release_slot; | |
1da177e4 LT |
264 | hotplug_slot->ops = &cpci_hotplug_slot_ops; |
265 | ||
266 | /* | |
267 | * Initialize the slot info structure with some known | |
268 | * good values. | |
269 | */ | |
d6c479e0 | 270 | dbg("initializing slot %s", name); |
1da177e4 LT |
271 | info->power_status = cpci_get_power_status(slot); |
272 | info->attention_status = cpci_get_attention_status(slot); | |
273 | ||
d6c479e0 AC |
274 | dbg("registering slot %s", name); |
275 | status = pci_hp_register(slot->hotplug_slot, bus, i, name); | |
1da177e4 LT |
276 | if (status) { |
277 | err("pci_hp_register failed with error %d", status); | |
d6c479e0 | 278 | goto error_info; |
1da177e4 | 279 | } |
d6c479e0 | 280 | dbg("slot registered with name: %s", slot_name(slot)); |
1da177e4 LT |
281 | |
282 | /* Add slot to our internal list */ | |
43b7d7cf | 283 | down_write(&list_rwsem); |
1da177e4 LT |
284 | list_add(&slot->slot_list, &slot_list); |
285 | slots++; | |
43b7d7cf | 286 | up_write(&list_rwsem); |
1da177e4 LT |
287 | } |
288 | return 0; | |
1da177e4 LT |
289 | error_info: |
290 | kfree(info); | |
291 | error_hpslot: | |
292 | kfree(hotplug_slot); | |
293 | error_slot: | |
294 | kfree(slot); | |
295 | error: | |
296 | return status; | |
297 | } | |
298 | ||
299 | int | |
300 | cpci_hp_unregister_bus(struct pci_bus *bus) | |
301 | { | |
302 | struct slot *slot; | |
bcc488ab SM |
303 | struct slot *tmp; |
304 | int status = 0; | |
1da177e4 | 305 | |
43b7d7cf | 306 | down_write(&list_rwsem); |
bcc488ab | 307 | if (!slots) { |
43b7d7cf | 308 | up_write(&list_rwsem); |
1da177e4 LT |
309 | return -1; |
310 | } | |
bcc488ab SM |
311 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { |
312 | if (slot->bus == bus) { | |
313 | list_del(&slot->slot_list); | |
314 | slots--; | |
315 | ||
d6c479e0 | 316 | dbg("deregistering slot %s", slot_name(slot)); |
1da177e4 | 317 | status = pci_hp_deregister(slot->hotplug_slot); |
bcc488ab | 318 | if (status) { |
1da177e4 LT |
319 | err("pci_hp_deregister failed with error %d", |
320 | status); | |
bcc488ab | 321 | break; |
1da177e4 | 322 | } |
1da177e4 LT |
323 | } |
324 | } | |
43b7d7cf | 325 | up_write(&list_rwsem); |
bcc488ab | 326 | return status; |
1da177e4 LT |
327 | } |
328 | ||
329 | /* This is the interrupt mode interrupt handler */ | |
330 | static irqreturn_t | |
7d12e780 | 331 | cpci_hp_intr(int irq, void *data) |
1da177e4 LT |
332 | { |
333 | dbg("entered cpci_hp_intr"); | |
334 | ||
335 | /* Check to see if it was our interrupt */ | |
6b4486e2 | 336 | if ((controller->irq_flags & IRQF_SHARED) && |
1da177e4 LT |
337 | !controller->ops->check_irq(controller->dev_id)) { |
338 | dbg("exited cpci_hp_intr, not our interrupt"); | |
339 | return IRQ_NONE; | |
340 | } | |
341 | ||
342 | /* Disable ENUM interrupt */ | |
343 | controller->ops->disable_irq(); | |
344 | ||
345 | /* Trigger processing by the event thread */ | |
0bec2c85 | 346 | wake_up_process(cpci_thread); |
1da177e4 LT |
347 | return IRQ_HANDLED; |
348 | } | |
349 | ||
350 | /* | |
43b7d7cf | 351 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
1da177e4 LT |
352 | * initialization, the system driver shall clear the |
353 | * INS bits of the cold-inserted devices. | |
354 | */ | |
355 | static int | |
bcc488ab | 356 | init_slots(int clear_ins) |
1da177e4 LT |
357 | { |
358 | struct slot *slot; | |
1da177e4 LT |
359 | struct pci_dev* dev; |
360 | ||
66bef8c0 | 361 | dbg("%s - enter", __func__); |
43b7d7cf | 362 | down_read(&list_rwsem); |
bcc488ab | 363 | if (!slots) { |
43b7d7cf | 364 | up_read(&list_rwsem); |
1da177e4 LT |
365 | return -1; |
366 | } | |
bcc488ab | 367 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 368 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab | 369 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
1da177e4 | 370 | dbg("%s - cleared INS for slot %s", |
d6c479e0 | 371 | __func__, slot_name(slot)); |
bcc488ab SM |
372 | dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0)); |
373 | if (dev) { | |
374 | if (update_adapter_status(slot->hotplug_slot, 1)) | |
375 | warn("failure to update adapter file"); | |
376 | if (update_latch_status(slot->hotplug_slot, 1)) | |
377 | warn("failure to update latch file"); | |
378 | slot->dev = dev; | |
1da177e4 LT |
379 | } |
380 | } | |
43b7d7cf | 381 | up_read(&list_rwsem); |
66bef8c0 | 382 | dbg("%s - exit", __func__); |
1da177e4 LT |
383 | return 0; |
384 | } | |
385 | ||
386 | static int | |
387 | check_slots(void) | |
388 | { | |
389 | struct slot *slot; | |
1da177e4 LT |
390 | int extracted; |
391 | int inserted; | |
43b7d7cf | 392 | u16 hs_csr; |
1da177e4 | 393 | |
43b7d7cf | 394 | down_read(&list_rwsem); |
bcc488ab | 395 | if (!slots) { |
43b7d7cf | 396 | up_read(&list_rwsem); |
1da177e4 LT |
397 | err("no slots registered, shutting down"); |
398 | return -1; | |
399 | } | |
400 | extracted = inserted = 0; | |
bcc488ab | 401 | list_for_each_entry(slot, &slot_list, slot_list) { |
d6c479e0 | 402 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
bcc488ab SM |
403 | if (cpci_check_and_clear_ins(slot)) { |
404 | /* | |
405 | * Some broken hardware (e.g. PLX 9054AB) asserts | |
406 | * ENUM# twice... | |
407 | */ | |
408 | if (slot->dev) { | |
409 | warn("slot %s already inserted", | |
d6c479e0 | 410 | slot_name(slot)); |
1da177e4 LT |
411 | inserted++; |
412 | continue; | |
413 | } | |
414 | ||
415 | /* Process insertion */ | |
d6c479e0 | 416 | dbg("%s - slot %s inserted", __func__, slot_name(slot)); |
1da177e4 LT |
417 | |
418 | /* GSM, debug */ | |
419 | hs_csr = cpci_get_hs_csr(slot); | |
420 | dbg("%s - slot %s HS_CSR (1) = %04x", | |
d6c479e0 | 421 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
422 | |
423 | /* Configure device */ | |
424 | dbg("%s - configuring slot %s", | |
d6c479e0 | 425 | __func__, slot_name(slot)); |
bcc488ab | 426 | if (cpci_configure_slot(slot)) { |
1da177e4 | 427 | err("%s - could not configure slot %s", |
d6c479e0 | 428 | __func__, slot_name(slot)); |
1da177e4 LT |
429 | continue; |
430 | } | |
431 | dbg("%s - finished configuring slot %s", | |
d6c479e0 | 432 | __func__, slot_name(slot)); |
1da177e4 LT |
433 | |
434 | /* GSM, debug */ | |
435 | hs_csr = cpci_get_hs_csr(slot); | |
436 | dbg("%s - slot %s HS_CSR (2) = %04x", | |
d6c479e0 | 437 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 438 | |
bcc488ab | 439 | if (update_latch_status(slot->hotplug_slot, 1)) |
1da177e4 | 440 | warn("failure to update latch file"); |
1da177e4 | 441 | |
bcc488ab | 442 | if (update_adapter_status(slot->hotplug_slot, 1)) |
1da177e4 | 443 | warn("failure to update adapter file"); |
1da177e4 LT |
444 | |
445 | cpci_led_off(slot); | |
446 | ||
447 | /* GSM, debug */ | |
448 | hs_csr = cpci_get_hs_csr(slot); | |
449 | dbg("%s - slot %s HS_CSR (3) = %04x", | |
d6c479e0 | 450 | __func__, slot_name(slot), hs_csr); |
1da177e4 LT |
451 | |
452 | inserted++; | |
bcc488ab | 453 | } else if (cpci_check_ext(slot)) { |
1da177e4 LT |
454 | /* Process extraction request */ |
455 | dbg("%s - slot %s extracted", | |
d6c479e0 | 456 | __func__, slot_name(slot)); |
1da177e4 LT |
457 | |
458 | /* GSM, debug */ | |
459 | hs_csr = cpci_get_hs_csr(slot); | |
460 | dbg("%s - slot %s HS_CSR = %04x", | |
d6c479e0 | 461 | __func__, slot_name(slot), hs_csr); |
1da177e4 | 462 | |
bcc488ab SM |
463 | if (!slot->extracting) { |
464 | if (update_latch_status(slot->hotplug_slot, 0)) { | |
1da177e4 LT |
465 | warn("failure to update latch file"); |
466 | } | |
467 | slot->extracting = 1; | |
bcc488ab | 468 | atomic_inc(&extracting); |
1da177e4 LT |
469 | } |
470 | extracted++; | |
bcc488ab | 471 | } else if (slot->extracting) { |
43b7d7cf | 472 | hs_csr = cpci_get_hs_csr(slot); |
bcc488ab | 473 | if (hs_csr == 0xffff) { |
43b7d7cf SM |
474 | /* |
475 | * Hmmm, we're likely hosed at this point, should we | |
476 | * bother trying to tell the driver or not? | |
477 | */ | |
478 | err("card in slot %s was improperly removed", | |
d6c479e0 | 479 | slot_name(slot)); |
bcc488ab | 480 | if (update_adapter_status(slot->hotplug_slot, 0)) |
43b7d7cf | 481 | warn("failure to update adapter file"); |
43b7d7cf SM |
482 | slot->extracting = 0; |
483 | atomic_dec(&extracting); | |
484 | } | |
1da177e4 LT |
485 | } |
486 | } | |
43b7d7cf SM |
487 | up_read(&list_rwsem); |
488 | dbg("inserted=%d, extracted=%d, extracting=%d", | |
489 | inserted, extracted, atomic_read(&extracting)); | |
bcc488ab | 490 | if (inserted || extracted) |
1da177e4 | 491 | return extracted; |
bcc488ab | 492 | else if (!atomic_read(&extracting)) { |
1da177e4 LT |
493 | err("cannot find ENUM# source, shutting down"); |
494 | return -1; | |
495 | } | |
43b7d7cf | 496 | return 0; |
1da177e4 LT |
497 | } |
498 | ||
499 | /* This is the interrupt mode worker thread body */ | |
500 | static int | |
501 | event_thread(void *data) | |
502 | { | |
503 | int rc; | |
1da177e4 | 504 | |
66bef8c0 | 505 | dbg("%s - event thread started", __func__); |
bcc488ab | 506 | while (1) { |
1da177e4 | 507 | dbg("event thread sleeping"); |
0bec2c85 SM |
508 | set_current_state(TASK_INTERRUPTIBLE); |
509 | schedule(); | |
510 | if (kthread_should_stop()) | |
1da177e4 | 511 | break; |
43b7d7cf | 512 | do { |
1da177e4 | 513 | rc = check_slots(); |
43b7d7cf | 514 | if (rc > 0) { |
1da177e4 LT |
515 | /* Give userspace a chance to handle extraction */ |
516 | msleep(500); | |
43b7d7cf | 517 | } else if (rc < 0) { |
66bef8c0 | 518 | dbg("%s - error checking slots", __func__); |
1da177e4 | 519 | thread_finished = 1; |
0bec2c85 | 520 | goto out; |
1da177e4 | 521 | } |
0bec2c85 SM |
522 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
523 | if (kthread_should_stop()) | |
bcc488ab | 524 | break; |
1da177e4 LT |
525 | |
526 | /* Re-enable ENUM# interrupt */ | |
66bef8c0 | 527 | dbg("%s - re-enabling irq", __func__); |
1da177e4 LT |
528 | controller->ops->enable_irq(); |
529 | } | |
0bec2c85 | 530 | out: |
1da177e4 LT |
531 | return 0; |
532 | } | |
533 | ||
534 | /* This is the polling mode worker thread body */ | |
535 | static int | |
536 | poll_thread(void *data) | |
537 | { | |
538 | int rc; | |
1da177e4 | 539 | |
bcc488ab | 540 | while (1) { |
0bec2c85 | 541 | if (kthread_should_stop() || signal_pending(current)) |
1da177e4 | 542 | break; |
bcc488ab | 543 | if (controller->ops->query_enum()) { |
43b7d7cf SM |
544 | do { |
545 | rc = check_slots(); | |
bcc488ab | 546 | if (rc > 0) { |
43b7d7cf SM |
547 | /* Give userspace a chance to handle extraction */ |
548 | msleep(500); | |
bcc488ab | 549 | } else if (rc < 0) { |
66bef8c0 | 550 | dbg("%s - error checking slots", __func__); |
43b7d7cf | 551 | thread_finished = 1; |
0bec2c85 | 552 | goto out; |
1da177e4 | 553 | } |
0bec2c85 | 554 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
1da177e4 | 555 | } |
1da177e4 LT |
556 | msleep(100); |
557 | } | |
0bec2c85 | 558 | out: |
1da177e4 LT |
559 | return 0; |
560 | } | |
561 | ||
562 | static int | |
563 | cpci_start_thread(void) | |
564 | { | |
bcc488ab | 565 | if (controller->irq) |
0bec2c85 | 566 | cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd"); |
bcc488ab | 567 | else |
0bec2c85 SM |
568 | cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld"); |
569 | if (IS_ERR(cpci_thread)) { | |
1da177e4 | 570 | err("Can't start up our thread"); |
0bec2c85 | 571 | return PTR_ERR(cpci_thread); |
1da177e4 | 572 | } |
0bec2c85 | 573 | thread_finished = 0; |
1da177e4 LT |
574 | return 0; |
575 | } | |
576 | ||
577 | static void | |
578 | cpci_stop_thread(void) | |
579 | { | |
0bec2c85 | 580 | kthread_stop(cpci_thread); |
1da177e4 | 581 | thread_finished = 1; |
1da177e4 LT |
582 | } |
583 | ||
584 | int | |
585 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) | |
586 | { | |
587 | int status = 0; | |
588 | ||
bcc488ab SM |
589 | if (controller) |
590 | return -1; | |
591 | if (!(new_controller && new_controller->ops)) | |
592 | return -EINVAL; | |
593 | if (new_controller->irq) { | |
594 | if (!(new_controller->ops->enable_irq && | |
595 | new_controller->ops->disable_irq)) | |
596 | status = -EINVAL; | |
597 | if (request_irq(new_controller->irq, | |
598 | cpci_hp_intr, | |
599 | new_controller->irq_flags, | |
600 | MY_NAME, | |
601 | new_controller->dev_id)) { | |
602 | err("Can't get irq %d for the hotplug cPCI controller", | |
603 | new_controller->irq); | |
604 | status = -ENODEV; | |
1da177e4 | 605 | } |
bcc488ab | 606 | dbg("%s - acquired controller irq %d", |
66bef8c0 | 607 | __func__, new_controller->irq); |
1da177e4 | 608 | } |
bcc488ab SM |
609 | if (!status) |
610 | controller = new_controller; | |
1da177e4 LT |
611 | return status; |
612 | } | |
613 | ||
bcc488ab SM |
614 | static void |
615 | cleanup_slots(void) | |
616 | { | |
617 | struct slot *slot; | |
618 | struct slot *tmp; | |
619 | ||
620 | /* | |
621 | * Unregister all of our slots with the pci_hotplug subsystem, | |
622 | * and free up all memory that we had allocated. | |
623 | */ | |
624 | down_write(&list_rwsem); | |
625 | if (!slots) | |
626 | goto cleanup_null; | |
627 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { | |
628 | list_del(&slot->slot_list); | |
629 | pci_hp_deregister(slot->hotplug_slot); | |
630 | } | |
631 | cleanup_null: | |
632 | up_write(&list_rwsem); | |
633 | return; | |
634 | } | |
635 | ||
1da177e4 LT |
636 | int |
637 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) | |
638 | { | |
639 | int status = 0; | |
640 | ||
bcc488ab SM |
641 | if (controller) { |
642 | if (!thread_finished) | |
1da177e4 | 643 | cpci_stop_thread(); |
bcc488ab | 644 | if (controller->irq) |
1da177e4 | 645 | free_irq(controller->irq, controller->dev_id); |
1da177e4 | 646 | controller = NULL; |
bcc488ab SM |
647 | cleanup_slots(); |
648 | } else | |
1da177e4 | 649 | status = -ENODEV; |
1da177e4 LT |
650 | return status; |
651 | } | |
652 | ||
653 | int | |
654 | cpci_hp_start(void) | |
655 | { | |
656 | static int first = 1; | |
657 | int status; | |
658 | ||
66bef8c0 | 659 | dbg("%s - enter", __func__); |
bcc488ab | 660 | if (!controller) |
1da177e4 | 661 | return -ENODEV; |
1da177e4 | 662 | |
43b7d7cf | 663 | down_read(&list_rwsem); |
bcc488ab | 664 | if (list_empty(&slot_list)) { |
43b7d7cf | 665 | up_read(&list_rwsem); |
1da177e4 LT |
666 | return -ENODEV; |
667 | } | |
43b7d7cf | 668 | up_read(&list_rwsem); |
1da177e4 | 669 | |
bcc488ab SM |
670 | status = init_slots(first); |
671 | if (first) | |
1da177e4 | 672 | first = 0; |
bcc488ab SM |
673 | if (status) |
674 | return status; | |
1da177e4 LT |
675 | |
676 | status = cpci_start_thread(); | |
bcc488ab | 677 | if (status) |
1da177e4 | 678 | return status; |
66bef8c0 | 679 | dbg("%s - thread started", __func__); |
1da177e4 | 680 | |
bcc488ab | 681 | if (controller->irq) { |
1da177e4 | 682 | /* Start enum interrupt processing */ |
66bef8c0 | 683 | dbg("%s - enabling irq", __func__); |
1da177e4 LT |
684 | controller->ops->enable_irq(); |
685 | } | |
66bef8c0 | 686 | dbg("%s - exit", __func__); |
1da177e4 LT |
687 | return 0; |
688 | } | |
689 | ||
690 | int | |
691 | cpci_hp_stop(void) | |
692 | { | |
bcc488ab | 693 | if (!controller) |
1da177e4 | 694 | return -ENODEV; |
bcc488ab | 695 | if (controller->irq) { |
1da177e4 | 696 | /* Stop enum interrupt processing */ |
66bef8c0 | 697 | dbg("%s - disabling irq", __func__); |
1da177e4 LT |
698 | controller->ops->disable_irq(); |
699 | } | |
700 | cpci_stop_thread(); | |
701 | return 0; | |
702 | } | |
703 | ||
1da177e4 LT |
704 | int __init |
705 | cpci_hotplug_init(int debug) | |
706 | { | |
1da177e4 | 707 | cpci_debug = debug; |
1da177e4 LT |
708 | return 0; |
709 | } | |
710 | ||
711 | void __exit | |
712 | cpci_hotplug_exit(void) | |
713 | { | |
714 | /* | |
715 | * Clean everything up. | |
716 | */ | |
bcc488ab SM |
717 | cpci_hp_stop(); |
718 | cpci_hp_unregister_controller(controller); | |
1da177e4 LT |
719 | } |
720 | ||
721 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); | |
722 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); | |
723 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); | |
724 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); | |
725 | EXPORT_SYMBOL_GPL(cpci_hp_start); | |
726 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |