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[PATCH] ACPI based I/O APIC hot-plug: acpiphp support
[deliverable/linux.git] / drivers / pci / hotplug / acpiphp_glue.c
CommitLineData
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
55static LIST_HEAD(bridge_list);
56
57#define MY_NAME "acpiphp_glue"
58
59static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
60static 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 */
83static 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 */
103static acpi_status
104is_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 */
119static acpi_status
120register_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 */
226static 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 */
242static 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 */
297static 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 325static 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 347static 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 */
381static acpi_status
382find_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 */
422static 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		 481static 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 494static 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		 530static acpi_status
531cleanup_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
541static 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		 555static 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
582static 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
623static acpi_status
624ioapic_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
674static 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		 681static 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
716static 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 */
759static 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 */
819static 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 */
857static 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 */
890static 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 */
926static 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		 965static 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
1012static 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 */
1029static 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 */
1050static 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
1075static 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 */
1117static 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 */
1193static 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		 1235static 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
1264static acpi_status
1265find_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
1277static 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 */
1286int __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 */
1307void __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 */
1316int __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 */
1345static 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 */
1367struct 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 */
1390int 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 */
1413int 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 */
1439u8 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 */
1449u8 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 */
1463u8 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 */
1476u32 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}
Linux kernel - Deliverables
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