Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ACPI PCI HotPlug glue functions to ACPI CA subsystem | |
3 | * | |
4 | * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) | |
5 | * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) | |
6 | * Copyright (C) 2002,2003 NEC Corporation | |
42f49a6a RS |
7 | * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) |
8 | * Copyright (C) 2003-2005 Hewlett Packard | |
8e7561cf RS |
9 | * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) |
10 | * Copyright (C) 2005 Intel Corporation | |
1da177e4 LT |
11 | * |
12 | * All rights reserved. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or (at | |
17 | * your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, but | |
20 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
22 | * NON INFRINGEMENT. See the GNU General Public License for more | |
23 | * details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
28 | * | |
29 | * Send feedback to <t-kochi@bq.jp.nec.com> | |
30 | * | |
31 | */ | |
32 | ||
42f49a6a RS |
33 | /* |
34 | * Lifetime rules for pci_dev: | |
35 | * - The one in acpiphp_func has its refcount elevated by pci_get_slot() | |
36 | * when the driver is loaded or when an insertion event occurs. It loses | |
37 | * a refcount when its ejected or the driver unloads. | |
38 | * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() | |
39 | * when the bridge is scanned and it loses a refcount when the bridge | |
40 | * is removed. | |
41 | */ | |
42 | ||
1da177e4 LT |
43 | #include <linux/init.h> |
44 | #include <linux/module.h> | |
45 | ||
46 | #include <linux/kernel.h> | |
47 | #include <linux/pci.h> | |
48 | #include <linux/smp_lock.h> | |
49 | #include <asm/semaphore.h> | |
50 | ||
51 | #include "../pci.h" | |
52 | #include "pci_hotplug.h" | |
53 | #include "acpiphp.h" | |
54 | ||
55 | static LIST_HEAD(bridge_list); | |
56 | ||
57 | #define MY_NAME "acpiphp_glue" | |
58 | ||
59 | static void handle_hotplug_event_bridge (acpi_handle, u32, void *); | |
60 | static void handle_hotplug_event_func (acpi_handle, u32, void *); | |
61 | ||
62 | /* | |
63 | * initialization & terminatation routines | |
64 | */ | |
65 | ||
66 | /** | |
67 | * is_ejectable - determine if a slot is ejectable | |
68 | * @handle: handle to acpi namespace | |
69 | * | |
70 | * Ejectable slot should satisfy at least these conditions: | |
71 | * | |
72 | * 1. has _ADR method | |
73 | * 2. has _EJ0 method | |
74 | * | |
75 | * optionally | |
76 | * | |
77 | * 1. has _STA method | |
78 | * 2. has _PS0 method | |
79 | * 3. has _PS3 method | |
80 | * 4. .. | |
81 | * | |
82 | */ | |
83 | static int is_ejectable(acpi_handle handle) | |
84 | { | |
85 | acpi_status status; | |
86 | acpi_handle tmp; | |
87 | ||
88 | status = acpi_get_handle(handle, "_ADR", &tmp); | |
89 | if (ACPI_FAILURE(status)) { | |
90 | return 0; | |
91 | } | |
92 | ||
93 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
94 | if (ACPI_FAILURE(status)) { | |
95 | return 0; | |
96 | } | |
97 | ||
98 | return 1; | |
99 | } | |
100 | ||
101 | ||
102 | /* callback routine to check the existence of ejectable slots */ | |
103 | static acpi_status | |
104 | is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv) | |
105 | { | |
106 | int *count = (int *)context; | |
107 | ||
108 | if (is_ejectable(handle)) { | |
109 | (*count)++; | |
110 | /* only one ejectable slot is enough */ | |
111 | return AE_CTRL_TERMINATE; | |
112 | } else { | |
113 | return AE_OK; | |
114 | } | |
115 | } | |
116 | ||
117 | ||
118 | /* callback routine to register each ACPI PCI slot object */ | |
119 | static acpi_status | |
120 | register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) | |
121 | { | |
122 | struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; | |
123 | struct acpiphp_slot *slot; | |
124 | struct acpiphp_func *newfunc; | |
125 | acpi_handle tmp; | |
126 | acpi_status status = AE_OK; | |
127 | unsigned long adr, sun; | |
128 | int device, function; | |
129 | static int num_slots = 0; /* XXX if we support I/O node hotplug... */ | |
130 | ||
131 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); | |
132 | ||
133 | if (ACPI_FAILURE(status)) | |
134 | return AE_OK; | |
135 | ||
136 | status = acpi_get_handle(handle, "_EJ0", &tmp); | |
137 | ||
138 | if (ACPI_FAILURE(status)) | |
139 | return AE_OK; | |
140 | ||
141 | device = (adr >> 16) & 0xffff; | |
142 | function = adr & 0xffff; | |
143 | ||
144 | newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL); | |
145 | if (!newfunc) | |
146 | return AE_NO_MEMORY; | |
147 | memset(newfunc, 0, sizeof(struct acpiphp_func)); | |
148 | ||
149 | INIT_LIST_HEAD(&newfunc->sibling); | |
150 | newfunc->handle = handle; | |
151 | newfunc->function = function; | |
152 | newfunc->flags = FUNC_HAS_EJ0; | |
153 | ||
154 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) | |
155 | newfunc->flags |= FUNC_HAS_STA; | |
156 | ||
157 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) | |
158 | newfunc->flags |= FUNC_HAS_PS0; | |
159 | ||
160 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) | |
161 | newfunc->flags |= FUNC_HAS_PS3; | |
162 | ||
163 | status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); | |
164 | if (ACPI_FAILURE(status)) | |
165 | sun = -1; | |
166 | ||
167 | /* search for objects that share the same slot */ | |
168 | for (slot = bridge->slots; slot; slot = slot->next) | |
169 | if (slot->device == device) { | |
170 | if (slot->sun != sun) | |
171 | warn("sibling found, but _SUN doesn't match!\n"); | |
172 | break; | |
173 | } | |
174 | ||
175 | if (!slot) { | |
176 | slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); | |
177 | if (!slot) { | |
178 | kfree(newfunc); | |
179 | return AE_NO_MEMORY; | |
180 | } | |
181 | ||
182 | memset(slot, 0, sizeof(struct acpiphp_slot)); | |
183 | slot->bridge = bridge; | |
184 | slot->id = num_slots++; | |
185 | slot->device = device; | |
186 | slot->sun = sun; | |
187 | INIT_LIST_HEAD(&slot->funcs); | |
188 | init_MUTEX(&slot->crit_sect); | |
189 | ||
190 | slot->next = bridge->slots; | |
191 | bridge->slots = slot; | |
192 | ||
193 | bridge->nr_slots++; | |
194 | ||
42f49a6a RS |
195 | dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n", |
196 | slot->sun, pci_domain_nr(bridge->pci_bus), | |
197 | bridge->pci_bus->number, slot->device); | |
1da177e4 LT |
198 | } |
199 | ||
200 | newfunc->slot = slot; | |
201 | list_add_tail(&newfunc->sibling, &slot->funcs); | |
202 | ||
203 | /* associate corresponding pci_dev */ | |
42f49a6a | 204 | newfunc->pci_dev = pci_get_slot(bridge->pci_bus, |
1da177e4 LT |
205 | PCI_DEVFN(device, function)); |
206 | if (newfunc->pci_dev) { | |
1da177e4 LT |
207 | slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); |
208 | } | |
209 | ||
210 | /* install notify handler */ | |
211 | status = acpi_install_notify_handler(handle, | |
212 | ACPI_SYSTEM_NOTIFY, | |
213 | handle_hotplug_event_func, | |
214 | newfunc); | |
215 | ||
216 | if (ACPI_FAILURE(status)) { | |
217 | err("failed to register interrupt notify handler\n"); | |
218 | return status; | |
219 | } | |
220 | ||
221 | return AE_OK; | |
222 | } | |
223 | ||
224 | ||
225 | /* see if it's worth looking at this bridge */ | |
226 | static int detect_ejectable_slots(acpi_handle *bridge_handle) | |
227 | { | |
228 | acpi_status status; | |
229 | int count; | |
230 | ||
231 | count = 0; | |
232 | ||
233 | /* only check slots defined directly below bridge object */ | |
234 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, | |
235 | is_ejectable_slot, (void *)&count, NULL); | |
236 | ||
237 | return count; | |
238 | } | |
239 | ||
240 | ||
1da177e4 LT |
241 | /* decode ACPI 2.0 _HPP hot plug parameters */ |
242 | static void decode_hpp(struct acpiphp_bridge *bridge) | |
243 | { | |
244 | acpi_status status; | |
245 | struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, | |
246 | .pointer = NULL}; | |
247 | union acpi_object *package; | |
248 | int i; | |
249 | ||
250 | /* default numbers */ | |
251 | bridge->hpp.cache_line_size = 0x10; | |
252 | bridge->hpp.latency_timer = 0x40; | |
253 | bridge->hpp.enable_SERR = 0; | |
254 | bridge->hpp.enable_PERR = 0; | |
255 | ||
256 | status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer); | |
257 | ||
258 | if (ACPI_FAILURE(status)) { | |
259 | dbg("_HPP evaluation failed\n"); | |
260 | return; | |
261 | } | |
262 | ||
263 | package = (union acpi_object *) buffer.pointer; | |
264 | ||
265 | if (!package || package->type != ACPI_TYPE_PACKAGE || | |
266 | package->package.count != 4 || !package->package.elements) { | |
267 | err("invalid _HPP object; ignoring\n"); | |
268 | goto err_exit; | |
269 | } | |
270 | ||
271 | for (i = 0; i < 4; i++) { | |
272 | if (package->package.elements[i].type != ACPI_TYPE_INTEGER) { | |
273 | err("invalid _HPP parameter type; ignoring\n"); | |
274 | goto err_exit; | |
275 | } | |
276 | } | |
277 | ||
278 | bridge->hpp.cache_line_size = package->package.elements[0].integer.value; | |
279 | bridge->hpp.latency_timer = package->package.elements[1].integer.value; | |
280 | bridge->hpp.enable_SERR = package->package.elements[2].integer.value; | |
281 | bridge->hpp.enable_PERR = package->package.elements[3].integer.value; | |
282 | ||
283 | dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n", | |
284 | bridge->hpp.cache_line_size, | |
285 | bridge->hpp.latency_timer, | |
286 | bridge->hpp.enable_SERR, | |
287 | bridge->hpp.enable_PERR); | |
288 | ||
289 | bridge->flags |= BRIDGE_HAS_HPP; | |
290 | ||
291 | err_exit: | |
292 | kfree(buffer.pointer); | |
293 | } | |
294 | ||
295 | ||
296 | /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ | |
297 | static void init_bridge_misc(struct acpiphp_bridge *bridge) | |
298 | { | |
299 | acpi_status status; | |
300 | ||
301 | /* decode ACPI 2.0 _HPP (hot plug parameters) */ | |
302 | decode_hpp(bridge); | |
303 | ||
1da177e4 LT |
304 | /* register all slot objects under this bridge */ |
305 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, | |
306 | register_slot, bridge, NULL); | |
307 | ||
308 | /* install notify handler */ | |
8e7561cf RS |
309 | if (bridge->type != BRIDGE_TYPE_HOST) { |
310 | status = acpi_install_notify_handler(bridge->handle, | |
1da177e4 LT |
311 | ACPI_SYSTEM_NOTIFY, |
312 | handle_hotplug_event_bridge, | |
313 | bridge); | |
314 | ||
8e7561cf RS |
315 | if (ACPI_FAILURE(status)) { |
316 | err("failed to register interrupt notify handler\n"); | |
317 | } | |
1da177e4 LT |
318 | } |
319 | ||
320 | list_add(&bridge->list, &bridge_list); | |
1da177e4 LT |
321 | } |
322 | ||
323 | ||
324 | /* allocate and initialize host bridge data structure */ | |
42f49a6a | 325 | static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus) |
1da177e4 | 326 | { |
1da177e4 LT |
327 | struct acpiphp_bridge *bridge; |
328 | ||
329 | bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); | |
330 | if (bridge == NULL) | |
331 | return; | |
332 | ||
333 | memset(bridge, 0, sizeof(struct acpiphp_bridge)); | |
334 | ||
335 | bridge->type = BRIDGE_TYPE_HOST; | |
336 | bridge->handle = handle; | |
1da177e4 | 337 | |
42f49a6a | 338 | bridge->pci_bus = pci_bus; |
1da177e4 LT |
339 | |
340 | spin_lock_init(&bridge->res_lock); | |
341 | ||
1da177e4 LT |
342 | init_bridge_misc(bridge); |
343 | } | |
344 | ||
345 | ||
346 | /* allocate and initialize PCI-to-PCI bridge data structure */ | |
42f49a6a | 347 | static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev) |
1da177e4 LT |
348 | { |
349 | struct acpiphp_bridge *bridge; | |
1da177e4 LT |
350 | |
351 | bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); | |
352 | if (bridge == NULL) { | |
353 | err("out of memory\n"); | |
354 | return; | |
355 | } | |
356 | ||
357 | memset(bridge, 0, sizeof(struct acpiphp_bridge)); | |
358 | ||
359 | bridge->type = BRIDGE_TYPE_P2P; | |
360 | bridge->handle = handle; | |
1da177e4 | 361 | |
42f49a6a RS |
362 | bridge->pci_dev = pci_dev_get(pci_dev); |
363 | bridge->pci_bus = pci_dev->subordinate; | |
1da177e4 LT |
364 | if (!bridge->pci_bus) { |
365 | err("This is not a PCI-to-PCI bridge!\n"); | |
42f49a6a | 366 | goto err; |
1da177e4 LT |
367 | } |
368 | ||
369 | spin_lock_init(&bridge->res_lock); | |
370 | ||
1da177e4 | 371 | init_bridge_misc(bridge); |
42f49a6a RS |
372 | return; |
373 | err: | |
374 | pci_dev_put(pci_dev); | |
375 | kfree(bridge); | |
376 | return; | |
1da177e4 LT |
377 | } |
378 | ||
379 | ||
380 | /* callback routine to find P2P bridges */ | |
381 | static acpi_status | |
382 | find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) | |
383 | { | |
384 | acpi_status status; | |
385 | acpi_handle dummy_handle; | |
1da177e4 | 386 | unsigned long tmp; |
42f49a6a | 387 | int device, function; |
1da177e4 | 388 | struct pci_dev *dev; |
42f49a6a | 389 | struct pci_bus *pci_bus = context; |
1da177e4 LT |
390 | |
391 | status = acpi_get_handle(handle, "_ADR", &dummy_handle); | |
392 | if (ACPI_FAILURE(status)) | |
393 | return AE_OK; /* continue */ | |
394 | ||
395 | status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); | |
396 | if (ACPI_FAILURE(status)) { | |
397 | dbg("%s: _ADR evaluation failure\n", __FUNCTION__); | |
398 | return AE_OK; | |
399 | } | |
400 | ||
401 | device = (tmp >> 16) & 0xffff; | |
402 | function = tmp & 0xffff; | |
403 | ||
42f49a6a | 404 | dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function)); |
1da177e4 | 405 | |
42f49a6a RS |
406 | if (!dev || !dev->subordinate) |
407 | goto out; | |
1da177e4 LT |
408 | |
409 | /* check if this bridge has ejectable slots */ | |
410 | if (detect_ejectable_slots(handle) > 0) { | |
411 | dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); | |
42f49a6a | 412 | add_p2p_bridge(handle, dev); |
1da177e4 LT |
413 | } |
414 | ||
42f49a6a RS |
415 | out: |
416 | pci_dev_put(dev); | |
1da177e4 LT |
417 | return AE_OK; |
418 | } | |
419 | ||
420 | ||
421 | /* find hot-pluggable slots, and then find P2P bridge */ | |
422 | static int add_bridge(acpi_handle handle) | |
423 | { | |
424 | acpi_status status; | |
425 | unsigned long tmp; | |
426 | int seg, bus; | |
427 | acpi_handle dummy_handle; | |
42f49a6a | 428 | struct pci_bus *pci_bus; |
1da177e4 LT |
429 | |
430 | /* if the bridge doesn't have _STA, we assume it is always there */ | |
431 | status = acpi_get_handle(handle, "_STA", &dummy_handle); | |
432 | if (ACPI_SUCCESS(status)) { | |
433 | status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); | |
434 | if (ACPI_FAILURE(status)) { | |
435 | dbg("%s: _STA evaluation failure\n", __FUNCTION__); | |
436 | return 0; | |
437 | } | |
438 | if ((tmp & ACPI_STA_FUNCTIONING) == 0) | |
439 | /* don't register this object */ | |
440 | return 0; | |
441 | } | |
442 | ||
443 | /* get PCI segment number */ | |
444 | status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); | |
445 | ||
446 | seg = ACPI_SUCCESS(status) ? tmp : 0; | |
447 | ||
448 | /* get PCI bus number */ | |
449 | status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); | |
450 | ||
451 | if (ACPI_SUCCESS(status)) { | |
452 | bus = tmp; | |
453 | } else { | |
454 | warn("can't get bus number, assuming 0\n"); | |
455 | bus = 0; | |
456 | } | |
457 | ||
42f49a6a RS |
458 | pci_bus = pci_find_bus(seg, bus); |
459 | if (!pci_bus) { | |
460 | err("Can't find bus %04x:%02x\n", seg, bus); | |
461 | return 0; | |
462 | } | |
463 | ||
1da177e4 LT |
464 | /* check if this bridge has ejectable slots */ |
465 | if (detect_ejectable_slots(handle) > 0) { | |
466 | dbg("found PCI host-bus bridge with hot-pluggable slots\n"); | |
42f49a6a | 467 | add_host_bridge(handle, pci_bus); |
1da177e4 LT |
468 | return 0; |
469 | } | |
470 | ||
1da177e4 LT |
471 | /* search P2P bridges under this host bridge */ |
472 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, | |
42f49a6a | 473 | find_p2p_bridge, pci_bus, NULL); |
1da177e4 LT |
474 | |
475 | if (ACPI_FAILURE(status)) | |
476 | warn("find_p2p_bridge faied (error code = 0x%x)\n",status); | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
42f49a6a RS |
481 | static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) |
482 | { | |
483 | struct list_head *head; | |
484 | list_for_each(head, &bridge_list) { | |
485 | struct acpiphp_bridge *bridge = list_entry(head, | |
486 | struct acpiphp_bridge, list); | |
487 | if (bridge->handle == handle) | |
488 | return bridge; | |
489 | } | |
490 | ||
491 | return NULL; | |
492 | } | |
1da177e4 | 493 | |
364d5094 | 494 | static void cleanup_bridge(struct acpiphp_bridge *bridge) |
1da177e4 | 495 | { |
42f49a6a | 496 | struct list_head *list, *tmp; |
42f49a6a RS |
497 | struct acpiphp_slot *slot; |
498 | acpi_status status; | |
364d5094 | 499 | acpi_handle handle = bridge->handle; |
42f49a6a RS |
500 | |
501 | status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
502 | handle_hotplug_event_bridge); | |
503 | if (ACPI_FAILURE(status)) | |
504 | err("failed to remove notify handler\n"); | |
505 | ||
506 | slot = bridge->slots; | |
507 | while (slot) { | |
508 | struct acpiphp_slot *next = slot->next; | |
509 | list_for_each_safe (list, tmp, &slot->funcs) { | |
510 | struct acpiphp_func *func; | |
511 | func = list_entry(list, struct acpiphp_func, sibling); | |
512 | status = acpi_remove_notify_handler(func->handle, | |
513 | ACPI_SYSTEM_NOTIFY, | |
514 | handle_hotplug_event_func); | |
515 | if (ACPI_FAILURE(status)) | |
516 | err("failed to remove notify handler\n"); | |
517 | pci_dev_put(func->pci_dev); | |
518 | list_del(list); | |
519 | kfree(func); | |
520 | } | |
521 | kfree(slot); | |
522 | slot = next; | |
523 | } | |
524 | ||
525 | pci_dev_put(bridge->pci_dev); | |
526 | list_del(&bridge->list); | |
527 | kfree(bridge); | |
1da177e4 LT |
528 | } |
529 | ||
364d5094 RS |
530 | static acpi_status |
531 | cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) | |
532 | { | |
533 | struct acpiphp_bridge *bridge; | |
534 | ||
535 | if (!(bridge = acpiphp_handle_to_bridge(handle))) | |
536 | return AE_OK; | |
537 | cleanup_bridge(bridge); | |
538 | return AE_OK; | |
539 | } | |
540 | ||
541 | static void remove_bridge(acpi_handle handle) | |
542 | { | |
543 | struct acpiphp_bridge *bridge; | |
544 | ||
545 | bridge = acpiphp_handle_to_bridge(handle); | |
546 | if (bridge) { | |
547 | cleanup_bridge(bridge); | |
548 | } else { | |
549 | /* clean-up p2p bridges under this host bridge */ | |
550 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
551 | (u32)1, cleanup_p2p_bridge, NULL, NULL); | |
552 | } | |
553 | } | |
1da177e4 | 554 | |
a0d399a8 KK |
555 | static struct pci_dev * get_apic_pci_info(acpi_handle handle) |
556 | { | |
557 | struct acpi_pci_id id; | |
558 | struct pci_bus *bus; | |
559 | struct pci_dev *dev; | |
560 | ||
561 | if (ACPI_FAILURE(acpi_get_pci_id(handle, &id))) | |
562 | return NULL; | |
563 | ||
564 | bus = pci_find_bus(id.segment, id.bus); | |
565 | if (!bus) | |
566 | return NULL; | |
567 | ||
568 | dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function)); | |
569 | if (!dev) | |
570 | return NULL; | |
571 | ||
572 | if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) && | |
573 | (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC)) | |
574 | { | |
575 | pci_dev_put(dev); | |
576 | return NULL; | |
577 | } | |
578 | ||
579 | return dev; | |
580 | } | |
581 | ||
582 | static int get_gsi_base(acpi_handle handle, u32 *gsi_base) | |
583 | { | |
584 | acpi_status status; | |
585 | int result = -1; | |
586 | unsigned long gsb; | |
587 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
588 | union acpi_object *obj; | |
589 | void *table; | |
590 | ||
591 | status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); | |
592 | if (ACPI_SUCCESS(status)) { | |
593 | *gsi_base = (u32)gsb; | |
594 | return 0; | |
595 | } | |
596 | ||
597 | status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer); | |
598 | if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer) | |
599 | return -1; | |
600 | ||
601 | obj = buffer.pointer; | |
602 | if (obj->type != ACPI_TYPE_BUFFER) | |
603 | goto out; | |
604 | ||
605 | table = obj->buffer.pointer; | |
606 | switch (((acpi_table_entry_header *)table)->type) { | |
607 | case ACPI_MADT_IOSAPIC: | |
608 | *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base; | |
609 | result = 0; | |
610 | break; | |
611 | case ACPI_MADT_IOAPIC: | |
612 | *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base; | |
613 | result = 0; | |
614 | break; | |
615 | default: | |
616 | break; | |
617 | } | |
618 | out: | |
619 | acpi_os_free(buffer.pointer); | |
620 | return result; | |
621 | } | |
622 | ||
623 | static acpi_status | |
624 | ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv) | |
625 | { | |
626 | acpi_status status; | |
627 | unsigned long sta; | |
628 | acpi_handle tmp; | |
629 | struct pci_dev *pdev; | |
630 | u32 gsi_base; | |
631 | u64 phys_addr; | |
632 | ||
633 | /* Evaluate _STA if present */ | |
634 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
635 | if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL) | |
636 | return AE_CTRL_DEPTH; | |
637 | ||
638 | /* Scan only PCI bus scope */ | |
639 | status = acpi_get_handle(handle, "_HID", &tmp); | |
640 | if (ACPI_SUCCESS(status)) | |
641 | return AE_CTRL_DEPTH; | |
642 | ||
643 | if (get_gsi_base(handle, &gsi_base)) | |
644 | return AE_OK; | |
645 | ||
646 | pdev = get_apic_pci_info(handle); | |
647 | if (!pdev) | |
648 | return AE_OK; | |
649 | ||
650 | if (pci_enable_device(pdev)) { | |
651 | pci_dev_put(pdev); | |
652 | return AE_OK; | |
653 | } | |
654 | ||
655 | pci_set_master(pdev); | |
656 | ||
657 | if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) { | |
658 | pci_disable_device(pdev); | |
659 | pci_dev_put(pdev); | |
660 | return AE_OK; | |
661 | } | |
662 | ||
663 | phys_addr = pci_resource_start(pdev, 0); | |
664 | if (acpi_register_ioapic(handle, phys_addr, gsi_base)) { | |
665 | pci_release_region(pdev, 0); | |
666 | pci_disable_device(pdev); | |
667 | pci_dev_put(pdev); | |
668 | return AE_OK; | |
669 | } | |
670 | ||
671 | return AE_OK; | |
672 | } | |
673 | ||
674 | static int acpiphp_configure_ioapics(acpi_handle handle) | |
675 | { | |
676 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
677 | ACPI_UINT32_MAX, ioapic_add, NULL, NULL); | |
678 | return 0; | |
679 | } | |
680 | ||
1da177e4 LT |
681 | static int power_on_slot(struct acpiphp_slot *slot) |
682 | { | |
683 | acpi_status status; | |
684 | struct acpiphp_func *func; | |
685 | struct list_head *l; | |
686 | int retval = 0; | |
687 | ||
688 | /* if already enabled, just skip */ | |
689 | if (slot->flags & SLOT_POWEREDON) | |
690 | goto err_exit; | |
691 | ||
692 | list_for_each (l, &slot->funcs) { | |
693 | func = list_entry(l, struct acpiphp_func, sibling); | |
694 | ||
695 | if (func->flags & FUNC_HAS_PS0) { | |
696 | dbg("%s: executing _PS0\n", __FUNCTION__); | |
697 | status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); | |
698 | if (ACPI_FAILURE(status)) { | |
699 | warn("%s: _PS0 failed\n", __FUNCTION__); | |
700 | retval = -1; | |
701 | goto err_exit; | |
702 | } else | |
703 | break; | |
704 | } | |
705 | } | |
706 | ||
707 | /* TBD: evaluate _STA to check if the slot is enabled */ | |
708 | ||
709 | slot->flags |= SLOT_POWEREDON; | |
710 | ||
711 | err_exit: | |
712 | return retval; | |
713 | } | |
714 | ||
715 | ||
716 | static int power_off_slot(struct acpiphp_slot *slot) | |
717 | { | |
718 | acpi_status status; | |
719 | struct acpiphp_func *func; | |
720 | struct list_head *l; | |
1da177e4 LT |
721 | |
722 | int retval = 0; | |
723 | ||
724 | /* if already disabled, just skip */ | |
725 | if ((slot->flags & SLOT_POWEREDON) == 0) | |
726 | goto err_exit; | |
727 | ||
728 | list_for_each (l, &slot->funcs) { | |
729 | func = list_entry(l, struct acpiphp_func, sibling); | |
730 | ||
2f523b15 | 731 | if (func->flags & FUNC_HAS_PS3) { |
1da177e4 LT |
732 | status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); |
733 | if (ACPI_FAILURE(status)) { | |
734 | warn("%s: _PS3 failed\n", __FUNCTION__); | |
735 | retval = -1; | |
736 | goto err_exit; | |
737 | } else | |
738 | break; | |
739 | } | |
740 | } | |
741 | ||
1da177e4 LT |
742 | /* TBD: evaluate _STA to check if the slot is disabled */ |
743 | ||
744 | slot->flags &= (~SLOT_POWEREDON); | |
745 | ||
746 | err_exit: | |
747 | return retval; | |
748 | } | |
749 | ||
750 | ||
751 | /** | |
752 | * enable_device - enable, configure a slot | |
753 | * @slot: slot to be enabled | |
754 | * | |
755 | * This function should be called per *physical slot*, | |
756 | * not per each slot object in ACPI namespace. | |
757 | * | |
758 | */ | |
759 | static int enable_device(struct acpiphp_slot *slot) | |
760 | { | |
1da177e4 | 761 | struct pci_dev *dev; |
42f49a6a | 762 | struct pci_bus *bus = slot->bridge->pci_bus; |
1da177e4 LT |
763 | struct list_head *l; |
764 | struct acpiphp_func *func; | |
765 | int retval = 0; | |
42f49a6a | 766 | int num, max, pass; |
1da177e4 LT |
767 | |
768 | if (slot->flags & SLOT_ENABLED) | |
769 | goto err_exit; | |
770 | ||
771 | /* sanity check: dev should be NULL when hot-plugged in */ | |
42f49a6a | 772 | dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0)); |
1da177e4 LT |
773 | if (dev) { |
774 | /* This case shouldn't happen */ | |
775 | err("pci_dev structure already exists.\n"); | |
42f49a6a | 776 | pci_dev_put(dev); |
1da177e4 LT |
777 | retval = -1; |
778 | goto err_exit; | |
779 | } | |
780 | ||
42f49a6a RS |
781 | num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); |
782 | if (num == 0) { | |
1da177e4 LT |
783 | err("No new device found\n"); |
784 | retval = -1; | |
785 | goto err_exit; | |
786 | } | |
787 | ||
42f49a6a RS |
788 | max = bus->secondary; |
789 | for (pass = 0; pass < 2; pass++) { | |
790 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
791 | if (PCI_SLOT(dev->devfn) != slot->device) | |
792 | continue; | |
793 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
794 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
795 | max = pci_scan_bridge(bus, dev, max, pass); | |
796 | } | |
1da177e4 LT |
797 | } |
798 | ||
42f49a6a RS |
799 | pci_bus_assign_resources(bus); |
800 | pci_bus_add_devices(bus); | |
801 | ||
1da177e4 LT |
802 | /* associate pci_dev to our representation */ |
803 | list_for_each (l, &slot->funcs) { | |
804 | func = list_entry(l, struct acpiphp_func, sibling); | |
42f49a6a | 805 | func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
1da177e4 | 806 | func->function)); |
1da177e4 LT |
807 | } |
808 | ||
809 | slot->flags |= SLOT_ENABLED; | |
810 | ||
1da177e4 LT |
811 | err_exit: |
812 | return retval; | |
813 | } | |
814 | ||
815 | ||
816 | /** | |
817 | * disable_device - disable a slot | |
818 | */ | |
819 | static int disable_device(struct acpiphp_slot *slot) | |
820 | { | |
821 | int retval = 0; | |
822 | struct acpiphp_func *func; | |
823 | struct list_head *l; | |
824 | ||
825 | /* is this slot already disabled? */ | |
826 | if (!(slot->flags & SLOT_ENABLED)) | |
827 | goto err_exit; | |
828 | ||
829 | list_for_each (l, &slot->funcs) { | |
830 | func = list_entry(l, struct acpiphp_func, sibling); | |
42f49a6a RS |
831 | if (!func->pci_dev) |
832 | continue; | |
1da177e4 | 833 | |
42f49a6a RS |
834 | pci_remove_bus_device(func->pci_dev); |
835 | pci_dev_put(func->pci_dev); | |
836 | func->pci_dev = NULL; | |
1da177e4 LT |
837 | } |
838 | ||
839 | slot->flags &= (~SLOT_ENABLED); | |
840 | ||
841 | err_exit: | |
842 | return retval; | |
843 | } | |
844 | ||
845 | ||
846 | /** | |
847 | * get_slot_status - get ACPI slot status | |
848 | * | |
849 | * if a slot has _STA for each function and if any one of them | |
850 | * returned non-zero status, return it | |
851 | * | |
852 | * if a slot doesn't have _STA and if any one of its functions' | |
853 | * configuration space is configured, return 0x0f as a _STA | |
854 | * | |
855 | * otherwise return 0 | |
856 | */ | |
857 | static unsigned int get_slot_status(struct acpiphp_slot *slot) | |
858 | { | |
859 | acpi_status status; | |
860 | unsigned long sta = 0; | |
861 | u32 dvid; | |
862 | struct list_head *l; | |
863 | struct acpiphp_func *func; | |
864 | ||
865 | list_for_each (l, &slot->funcs) { | |
866 | func = list_entry(l, struct acpiphp_func, sibling); | |
867 | ||
868 | if (func->flags & FUNC_HAS_STA) { | |
869 | status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); | |
870 | if (ACPI_SUCCESS(status) && sta) | |
871 | break; | |
872 | } else { | |
873 | pci_bus_read_config_dword(slot->bridge->pci_bus, | |
874 | PCI_DEVFN(slot->device, | |
875 | func->function), | |
876 | PCI_VENDOR_ID, &dvid); | |
877 | if (dvid != 0xffffffff) { | |
878 | sta = ACPI_STA_ALL; | |
879 | break; | |
880 | } | |
881 | } | |
882 | } | |
883 | ||
884 | return (unsigned int)sta; | |
885 | } | |
886 | ||
8d50e332 RS |
887 | /** |
888 | * acpiphp_eject_slot - physically eject the slot | |
889 | */ | |
890 | static int acpiphp_eject_slot(struct acpiphp_slot *slot) | |
891 | { | |
892 | acpi_status status; | |
893 | struct acpiphp_func *func; | |
894 | struct list_head *l; | |
895 | struct acpi_object_list arg_list; | |
896 | union acpi_object arg; | |
897 | ||
898 | list_for_each (l, &slot->funcs) { | |
899 | func = list_entry(l, struct acpiphp_func, sibling); | |
900 | ||
901 | /* We don't want to call _EJ0 on non-existing functions. */ | |
902 | if ((func->flags & FUNC_HAS_EJ0)) { | |
903 | /* _EJ0 method take one argument */ | |
904 | arg_list.count = 1; | |
905 | arg_list.pointer = &arg; | |
906 | arg.type = ACPI_TYPE_INTEGER; | |
907 | arg.integer.value = 1; | |
908 | ||
909 | status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); | |
910 | if (ACPI_FAILURE(status)) { | |
911 | warn("%s: _EJ0 failed\n", __FUNCTION__); | |
912 | return -1; | |
913 | } else | |
914 | break; | |
915 | } | |
916 | } | |
917 | return 0; | |
918 | } | |
919 | ||
1da177e4 LT |
920 | /** |
921 | * acpiphp_check_bridge - re-enumerate devices | |
922 | * | |
923 | * Iterate over all slots under this bridge and make sure that if a | |
924 | * card is present they are enabled, and if not they are disabled. | |
925 | */ | |
926 | static int acpiphp_check_bridge(struct acpiphp_bridge *bridge) | |
927 | { | |
928 | struct acpiphp_slot *slot; | |
929 | int retval = 0; | |
930 | int enabled, disabled; | |
931 | ||
932 | enabled = disabled = 0; | |
933 | ||
934 | for (slot = bridge->slots; slot; slot = slot->next) { | |
935 | unsigned int status = get_slot_status(slot); | |
936 | if (slot->flags & SLOT_ENABLED) { | |
937 | if (status == ACPI_STA_ALL) | |
938 | continue; | |
939 | retval = acpiphp_disable_slot(slot); | |
940 | if (retval) { | |
941 | err("Error occurred in disabling\n"); | |
942 | goto err_exit; | |
8d50e332 RS |
943 | } else { |
944 | acpiphp_eject_slot(slot); | |
1da177e4 LT |
945 | } |
946 | disabled++; | |
947 | } else { | |
948 | if (status != ACPI_STA_ALL) | |
949 | continue; | |
950 | retval = acpiphp_enable_slot(slot); | |
951 | if (retval) { | |
952 | err("Error occurred in enabling\n"); | |
953 | goto err_exit; | |
954 | } | |
955 | enabled++; | |
956 | } | |
957 | } | |
958 | ||
959 | dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); | |
960 | ||
961 | err_exit: | |
962 | return retval; | |
963 | } | |
964 | ||
8e7561cf RS |
965 | static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge) |
966 | { | |
967 | u16 pci_cmd, pci_bctl; | |
968 | struct pci_dev *cdev; | |
969 | ||
970 | /* Program hpp values for this device */ | |
971 | if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL || | |
972 | (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && | |
973 | (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI))) | |
974 | return; | |
975 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, | |
976 | bridge->hpp.cache_line_size); | |
977 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, | |
978 | bridge->hpp.latency_timer); | |
979 | pci_read_config_word(dev, PCI_COMMAND, &pci_cmd); | |
980 | if (bridge->hpp.enable_SERR) | |
981 | pci_cmd |= PCI_COMMAND_SERR; | |
982 | else | |
983 | pci_cmd &= ~PCI_COMMAND_SERR; | |
984 | if (bridge->hpp.enable_PERR) | |
985 | pci_cmd |= PCI_COMMAND_PARITY; | |
986 | else | |
987 | pci_cmd &= ~PCI_COMMAND_PARITY; | |
988 | pci_write_config_word(dev, PCI_COMMAND, pci_cmd); | |
989 | ||
990 | /* Program bridge control value and child devices */ | |
991 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) { | |
992 | pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, | |
993 | bridge->hpp.latency_timer); | |
994 | pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl); | |
995 | if (bridge->hpp.enable_SERR) | |
996 | pci_bctl |= PCI_BRIDGE_CTL_SERR; | |
997 | else | |
998 | pci_bctl &= ~PCI_BRIDGE_CTL_SERR; | |
999 | if (bridge->hpp.enable_PERR) | |
1000 | pci_bctl |= PCI_BRIDGE_CTL_PARITY; | |
1001 | else | |
1002 | pci_bctl &= ~PCI_BRIDGE_CTL_PARITY; | |
1003 | pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl); | |
1004 | if (dev->subordinate) { | |
1005 | list_for_each_entry(cdev, &dev->subordinate->devices, | |
1006 | bus_list) | |
1007 | program_hpp(cdev, bridge); | |
1008 | } | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus) | |
1013 | { | |
1014 | struct acpiphp_bridge bridge; | |
1015 | struct pci_dev *dev; | |
1016 | ||
1017 | memset(&bridge, 0, sizeof(bridge)); | |
1018 | bridge.handle = handle; | |
1019 | decode_hpp(&bridge); | |
1020 | list_for_each_entry(dev, &bus->devices, bus_list) | |
1021 | program_hpp(dev, &bridge); | |
1022 | ||
1023 | } | |
1024 | ||
1025 | /* | |
1026 | * Remove devices for which we could not assign resources, call | |
1027 | * arch specific code to fix-up the bus | |
1028 | */ | |
1029 | static void acpiphp_sanitize_bus(struct pci_bus *bus) | |
1030 | { | |
1031 | struct pci_dev *dev; | |
1032 | int i; | |
1033 | unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; | |
1034 | ||
1035 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
1036 | for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { | |
1037 | struct resource *res = &dev->resource[i]; | |
1038 | if ((res->flags & type_mask) && !res->start && | |
1039 | res->end) { | |
1040 | /* Could not assign a required resources | |
1041 | * for this device, remove it */ | |
1042 | pci_remove_bus_device(dev); | |
1043 | break; | |
1044 | } | |
1045 | } | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | /* Program resources in newly inserted bridge */ | |
1050 | static int acpiphp_configure_bridge (acpi_handle handle) | |
1051 | { | |
1052 | struct acpi_pci_id pci_id; | |
1053 | struct pci_bus *bus; | |
1054 | ||
1055 | if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) { | |
1056 | err("cannot get PCI domain and bus number for bridge\n"); | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | bus = pci_find_bus(pci_id.segment, pci_id.bus); | |
1060 | if (!bus) { | |
1061 | err("cannot find bus %d:%d\n", | |
1062 | pci_id.segment, pci_id.bus); | |
1063 | return -EINVAL; | |
1064 | } | |
1065 | ||
1066 | pci_bus_size_bridges(bus); | |
1067 | pci_bus_assign_resources(bus); | |
1068 | acpiphp_sanitize_bus(bus); | |
1069 | acpiphp_set_hpp_values(handle, bus); | |
1070 | pci_enable_bridges(bus); | |
a0d399a8 | 1071 | acpiphp_configure_ioapics(handle); |
8e7561cf RS |
1072 | return 0; |
1073 | } | |
1074 | ||
1075 | static void handle_bridge_insertion(acpi_handle handle, u32 type) | |
1076 | { | |
1077 | struct acpi_device *device, *pdevice; | |
1078 | acpi_handle phandle; | |
1079 | ||
1080 | if ((type != ACPI_NOTIFY_BUS_CHECK) && | |
1081 | (type != ACPI_NOTIFY_DEVICE_CHECK)) { | |
1082 | err("unexpected notification type %d\n", type); | |
1083 | return; | |
1084 | } | |
1085 | ||
1086 | acpi_get_parent(handle, &phandle); | |
1087 | if (acpi_bus_get_device(phandle, &pdevice)) { | |
1088 | dbg("no parent device, assuming NULL\n"); | |
1089 | pdevice = NULL; | |
1090 | } | |
1091 | if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { | |
1092 | err("cannot add bridge to acpi list\n"); | |
1093 | return; | |
1094 | } | |
1095 | if (!acpiphp_configure_bridge(handle) && | |
1096 | !acpi_bus_start(device)) | |
1097 | add_bridge(handle); | |
1098 | else | |
1099 | err("cannot configure and start bridge\n"); | |
1100 | ||
1101 | } | |
1102 | ||
1da177e4 LT |
1103 | /* |
1104 | * ACPI event handlers | |
1105 | */ | |
1106 | ||
1107 | /** | |
1108 | * handle_hotplug_event_bridge - handle ACPI event on bridges | |
1109 | * | |
1110 | * @handle: Notify()'ed acpi_handle | |
1111 | * @type: Notify code | |
1112 | * @context: pointer to acpiphp_bridge structure | |
1113 | * | |
1114 | * handles ACPI event notification on {host,p2p} bridges | |
1115 | * | |
1116 | */ | |
1117 | static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) | |
1118 | { | |
1119 | struct acpiphp_bridge *bridge; | |
1120 | char objname[64]; | |
1121 | struct acpi_buffer buffer = { .length = sizeof(objname), | |
1122 | .pointer = objname }; | |
8e7561cf | 1123 | struct acpi_device *device; |
1da177e4 | 1124 | |
8e7561cf RS |
1125 | if (acpi_bus_get_device(handle, &device)) { |
1126 | /* This bridge must have just been physically inserted */ | |
1127 | handle_bridge_insertion(handle, type); | |
1128 | return; | |
1129 | } | |
1130 | ||
1131 | bridge = acpiphp_handle_to_bridge(handle); | |
1132 | if (!bridge) { | |
1133 | err("cannot get bridge info\n"); | |
1134 | return; | |
1135 | } | |
1da177e4 LT |
1136 | |
1137 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1138 | ||
1139 | switch (type) { | |
1140 | case ACPI_NOTIFY_BUS_CHECK: | |
1141 | /* bus re-enumerate */ | |
1142 | dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); | |
1143 | acpiphp_check_bridge(bridge); | |
1144 | break; | |
1145 | ||
1146 | case ACPI_NOTIFY_DEVICE_CHECK: | |
1147 | /* device check */ | |
1148 | dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); | |
1149 | acpiphp_check_bridge(bridge); | |
1150 | break; | |
1151 | ||
1152 | case ACPI_NOTIFY_DEVICE_WAKE: | |
1153 | /* wake event */ | |
1154 | dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); | |
1155 | break; | |
1156 | ||
1157 | case ACPI_NOTIFY_EJECT_REQUEST: | |
1158 | /* request device eject */ | |
1159 | dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); | |
1160 | break; | |
1161 | ||
1162 | case ACPI_NOTIFY_FREQUENCY_MISMATCH: | |
1163 | printk(KERN_ERR "Device %s cannot be configured due" | |
1164 | " to a frequency mismatch\n", objname); | |
1165 | break; | |
1166 | ||
1167 | case ACPI_NOTIFY_BUS_MODE_MISMATCH: | |
1168 | printk(KERN_ERR "Device %s cannot be configured due" | |
1169 | " to a bus mode mismatch\n", objname); | |
1170 | break; | |
1171 | ||
1172 | case ACPI_NOTIFY_POWER_FAULT: | |
1173 | printk(KERN_ERR "Device %s has suffered a power fault\n", | |
1174 | objname); | |
1175 | break; | |
1176 | ||
1177 | default: | |
1178 | warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); | |
1179 | break; | |
1180 | } | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | /** |
1184 | * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) | |
1185 | * | |
1186 | * @handle: Notify()'ed acpi_handle | |
1187 | * @type: Notify code | |
1188 | * @context: pointer to acpiphp_func structure | |
1189 | * | |
1190 | * handles ACPI event notification on slots | |
1191 | * | |
1192 | */ | |
1193 | static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) | |
1194 | { | |
1195 | struct acpiphp_func *func; | |
1196 | char objname[64]; | |
1197 | struct acpi_buffer buffer = { .length = sizeof(objname), | |
1198 | .pointer = objname }; | |
1199 | ||
1200 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1201 | ||
1202 | func = (struct acpiphp_func *)context; | |
1203 | ||
1204 | switch (type) { | |
1205 | case ACPI_NOTIFY_BUS_CHECK: | |
1206 | /* bus re-enumerate */ | |
1207 | dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); | |
1208 | acpiphp_enable_slot(func->slot); | |
1209 | break; | |
1210 | ||
1211 | case ACPI_NOTIFY_DEVICE_CHECK: | |
1212 | /* device check : re-enumerate from parent bus */ | |
1213 | dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); | |
1214 | acpiphp_check_bridge(func->slot->bridge); | |
1215 | break; | |
1216 | ||
1217 | case ACPI_NOTIFY_DEVICE_WAKE: | |
1218 | /* wake event */ | |
1219 | dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); | |
1220 | break; | |
1221 | ||
1222 | case ACPI_NOTIFY_EJECT_REQUEST: | |
1223 | /* request device eject */ | |
1224 | dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); | |
8d50e332 RS |
1225 | if (!(acpiphp_disable_slot(func->slot))) |
1226 | acpiphp_eject_slot(func->slot); | |
1da177e4 LT |
1227 | break; |
1228 | ||
1229 | default: | |
1230 | warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); | |
1231 | break; | |
1232 | } | |
1233 | } | |
1234 | ||
8e7561cf RS |
1235 | static int is_root_bridge(acpi_handle handle) |
1236 | { | |
1237 | acpi_status status; | |
1238 | struct acpi_device_info *info; | |
1239 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1240 | int i; | |
1241 | ||
1242 | status = acpi_get_object_info(handle, &buffer); | |
1243 | if (ACPI_SUCCESS(status)) { | |
1244 | info = buffer.pointer; | |
1245 | if ((info->valid & ACPI_VALID_HID) && | |
1246 | !strcmp(PCI_ROOT_HID_STRING, | |
1247 | info->hardware_id.value)) { | |
1248 | acpi_os_free(buffer.pointer); | |
1249 | return 1; | |
1250 | } | |
1251 | if (info->valid & ACPI_VALID_CID) { | |
1252 | for (i=0; i < info->compatibility_id.count; i++) { | |
1253 | if (!strcmp(PCI_ROOT_HID_STRING, | |
1254 | info->compatibility_id.id[i].value)) { | |
1255 | acpi_os_free(buffer.pointer); | |
1256 | return 1; | |
1257 | } | |
1258 | } | |
1259 | } | |
1260 | } | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | static acpi_status | |
1265 | find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) | |
1266 | { | |
1267 | int *count = (int *)context; | |
1268 | ||
1269 | if (is_root_bridge(handle)) { | |
1270 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, | |
1271 | handle_hotplug_event_bridge, NULL); | |
1272 | (*count)++; | |
1273 | } | |
1274 | return AE_OK ; | |
1275 | } | |
1da177e4 LT |
1276 | |
1277 | static struct acpi_pci_driver acpi_pci_hp_driver = { | |
1278 | .add = add_bridge, | |
1279 | .remove = remove_bridge, | |
1280 | }; | |
1281 | ||
1282 | /** | |
1283 | * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures | |
1284 | * | |
1285 | */ | |
1286 | int __init acpiphp_glue_init(void) | |
1287 | { | |
8e7561cf | 1288 | int num = 0; |
1da177e4 | 1289 | |
8e7561cf RS |
1290 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
1291 | ACPI_UINT32_MAX, find_root_bridges, &num, NULL); | |
1da177e4 LT |
1292 | |
1293 | if (num <= 0) | |
1294 | return -1; | |
8e7561cf RS |
1295 | else |
1296 | acpi_pci_register_driver(&acpi_pci_hp_driver); | |
1da177e4 LT |
1297 | |
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | ||
1302 | /** | |
1303 | * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures | |
1304 | * | |
1305 | * This function frees all data allocated in acpiphp_glue_init() | |
1306 | */ | |
1307 | void __exit acpiphp_glue_exit(void) | |
1308 | { | |
1da177e4 LT |
1309 | acpi_pci_unregister_driver(&acpi_pci_hp_driver); |
1310 | } | |
1311 | ||
1312 | ||
1313 | /** | |
1314 | * acpiphp_get_num_slots - count number of slots in a system | |
1315 | */ | |
1316 | int __init acpiphp_get_num_slots(void) | |
1317 | { | |
1318 | struct list_head *node; | |
1319 | struct acpiphp_bridge *bridge; | |
1320 | int num_slots; | |
1321 | ||
1322 | num_slots = 0; | |
1323 | ||
1324 | list_for_each (node, &bridge_list) { | |
1325 | bridge = (struct acpiphp_bridge *)node; | |
42f49a6a RS |
1326 | dbg("Bus %04x:%02x has %d slot%s\n", |
1327 | pci_domain_nr(bridge->pci_bus), | |
1328 | bridge->pci_bus->number, bridge->nr_slots, | |
1329 | bridge->nr_slots == 1 ? "" : "s"); | |
1da177e4 LT |
1330 | num_slots += bridge->nr_slots; |
1331 | } | |
1332 | ||
42f49a6a | 1333 | dbg("Total %d slots\n", num_slots); |
1da177e4 LT |
1334 | return num_slots; |
1335 | } | |
1336 | ||
1337 | ||
1338 | #if 0 | |
1339 | /** | |
1340 | * acpiphp_for_each_slot - call function for each slot | |
1341 | * @fn: callback function | |
1342 | * @data: context to be passed to callback function | |
1343 | * | |
1344 | */ | |
1345 | static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) | |
1346 | { | |
1347 | struct list_head *node; | |
1348 | struct acpiphp_bridge *bridge; | |
1349 | struct acpiphp_slot *slot; | |
1350 | int retval = 0; | |
1351 | ||
1352 | list_for_each (node, &bridge_list) { | |
1353 | bridge = (struct acpiphp_bridge *)node; | |
1354 | for (slot = bridge->slots; slot; slot = slot->next) { | |
1355 | retval = fn(slot, data); | |
1356 | if (!retval) | |
1357 | goto err_exit; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | err_exit: | |
1362 | return retval; | |
1363 | } | |
1364 | #endif | |
1365 | ||
1366 | /* search matching slot from id */ | |
1367 | struct acpiphp_slot *get_slot_from_id(int id) | |
1368 | { | |
1369 | struct list_head *node; | |
1370 | struct acpiphp_bridge *bridge; | |
1371 | struct acpiphp_slot *slot; | |
1372 | ||
1373 | list_for_each (node, &bridge_list) { | |
1374 | bridge = (struct acpiphp_bridge *)node; | |
1375 | for (slot = bridge->slots; slot; slot = slot->next) | |
1376 | if (slot->id == id) | |
1377 | return slot; | |
1378 | } | |
1379 | ||
1380 | /* should never happen! */ | |
1381 | err("%s: no object for id %d\n", __FUNCTION__, id); | |
1382 | WARN_ON(1); | |
1383 | return NULL; | |
1384 | } | |
1385 | ||
1386 | ||
1387 | /** | |
1388 | * acpiphp_enable_slot - power on slot | |
1389 | */ | |
1390 | int acpiphp_enable_slot(struct acpiphp_slot *slot) | |
1391 | { | |
1392 | int retval; | |
1393 | ||
1394 | down(&slot->crit_sect); | |
1395 | ||
1396 | /* wake up all functions */ | |
1397 | retval = power_on_slot(slot); | |
1398 | if (retval) | |
1399 | goto err_exit; | |
1400 | ||
1401 | if (get_slot_status(slot) == ACPI_STA_ALL) | |
1402 | /* configure all functions */ | |
1403 | retval = enable_device(slot); | |
1404 | ||
1405 | err_exit: | |
1406 | up(&slot->crit_sect); | |
1407 | return retval; | |
1408 | } | |
1409 | ||
1da177e4 LT |
1410 | /** |
1411 | * acpiphp_disable_slot - power off slot | |
1412 | */ | |
1413 | int acpiphp_disable_slot(struct acpiphp_slot *slot) | |
1414 | { | |
1415 | int retval = 0; | |
1416 | ||
1417 | down(&slot->crit_sect); | |
1418 | ||
1419 | /* unconfigure all functions */ | |
1420 | retval = disable_device(slot); | |
1421 | if (retval) | |
1422 | goto err_exit; | |
1423 | ||
1424 | /* power off all functions */ | |
1425 | retval = power_off_slot(slot); | |
1426 | if (retval) | |
1427 | goto err_exit; | |
1428 | ||
1da177e4 LT |
1429 | err_exit: |
1430 | up(&slot->crit_sect); | |
1431 | return retval; | |
1432 | } | |
1433 | ||
1434 | ||
1435 | /* | |
1436 | * slot enabled: 1 | |
1437 | * slot disabled: 0 | |
1438 | */ | |
1439 | u8 acpiphp_get_power_status(struct acpiphp_slot *slot) | |
1440 | { | |
8d50e332 | 1441 | return (slot->flags & SLOT_POWEREDON); |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | ||
1445 | /* | |
1446 | * latch closed: 1 | |
1447 | * latch open: 0 | |
1448 | */ | |
1449 | u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) | |
1450 | { | |
1451 | unsigned int sta; | |
1452 | ||
1453 | sta = get_slot_status(slot); | |
1454 | ||
1455 | return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0; | |
1456 | } | |
1457 | ||
1458 | ||
1459 | /* | |
1460 | * adapter presence : 1 | |
1461 | * absence : 0 | |
1462 | */ | |
1463 | u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) | |
1464 | { | |
1465 | unsigned int sta; | |
1466 | ||
1467 | sta = get_slot_status(slot); | |
1468 | ||
1469 | return (sta == 0) ? 0 : 1; | |
1470 | } | |
1471 | ||
1472 | ||
1473 | /* | |
1474 | * pci address (seg/bus/dev) | |
1475 | */ | |
1476 | u32 acpiphp_get_address(struct acpiphp_slot *slot) | |
1477 | { | |
1478 | u32 address; | |
42f49a6a | 1479 | struct pci_bus *pci_bus = slot->bridge->pci_bus; |
1da177e4 | 1480 | |
42f49a6a RS |
1481 | address = (pci_domain_nr(pci_bus) << 16) | |
1482 | (pci_bus->number << 8) | | |
1da177e4 LT |
1483 | slot->device; |
1484 | ||
1485 | return address; | |
1486 | } |