drivers/pci/hotplug/acpiphp_glue.c

   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
   7  * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
   8  * Copyright (C) 2003-2005 Hewlett Packard
   9  * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
  10  * Copyright (C) 2005 Intel Corporation
  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
  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
  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
 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);
 198         }
 199
 200         newfunc->slot = slot;
 201         list_add_tail(&newfunc->sibling, &slot->funcs);
 202
 203         /* associate corresponding pci_dev */
 204         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 205                                          PCI_DEVFN(device, function));
 206         if (newfunc->pci_dev) {
 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
 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
 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 */
 309         if (bridge->type != BRIDGE_TYPE_HOST) {
 310                 status = acpi_install_notify_handler(bridge->handle,
 311                                              ACPI_SYSTEM_NOTIFY,
 312                                              handle_hotplug_event_bridge,
 313                                              bridge);
 314
 315                 if (ACPI_FAILURE(status)) {
 316                         err("failed to register interrupt notify handler\n");
 317                 }
 318         }
 319
 320         list_add(&bridge->list, &bridge_list);
 321 }
 322
 323
 324 /* allocate and initialize host bridge data structure */
 325 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 326 {
 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;
 337
 338         bridge->pci_bus = pci_bus;
 339
 340         spin_lock_init(&bridge->res_lock);
 341
 342         init_bridge_misc(bridge);
 343 }
 344
 345
 346 /* allocate and initialize PCI-to-PCI bridge data structure */
 347 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 348 {
 349         struct acpiphp_bridge *bridge;
 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;
 361
 362         bridge->pci_dev = pci_dev_get(pci_dev);
 363         bridge->pci_bus = pci_dev->subordinate;
 364         if (!bridge->pci_bus) {
 365                 err("This is not a PCI-to-PCI bridge!\n");
 366                 goto err;
 367         }
 368
 369         spin_lock_init(&bridge->res_lock);
 370
 371         init_bridge_misc(bridge);
 372         return;
 373  err:
 374         pci_dev_put(pci_dev);
 375         kfree(bridge);
 376         return;
 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;
 386         unsigned long tmp;
 387         int device, function;
 388         struct pci_dev *dev;
 389         struct pci_bus *pci_bus = context;
 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
 404         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 405
 406         if (!dev || !dev->subordinate)
 407                 goto out;
 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));
 412                 add_p2p_bridge(handle, dev);
 413         }
 414
 415  out:
 416         pci_dev_put(dev);
 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;
 428         struct pci_bus *pci_bus;
 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
 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
 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");
 467                 add_host_bridge(handle, pci_bus);
 468                 return 0;
 469         }
 470
 471         /* search P2P bridges under this host bridge */
 472         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 473                                      find_p2p_bridge, pci_bus, NULL);
 474
 475         if (ACPI_FAILURE(status))
 476                 warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
 477
 478         return 0;
 479 }
 480
 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 }
 493
 494 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 495 {
 496         struct list_head *list, *tmp;
 497         struct acpiphp_slot *slot;
 498         acpi_status status;
 499         acpi_handle handle = bridge->handle;
 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);
 528 }
 529
 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 }
 554
 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
 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;
 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
 731                 if (func->flags & FUNC_HAS_PS3) {
 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
 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 {
 761         struct pci_dev *dev;
 762         struct pci_bus *bus = slot->bridge->pci_bus;
 763         struct list_head *l;
 764         struct acpiphp_func *func;
 765         int retval = 0;
 766         int num, max, pass;
 767
 768         if (slot->flags & SLOT_ENABLED)
 769                 goto err_exit;
 770
 771         /* sanity check: dev should be NULL when hot-plugged in */
 772         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
 773         if (dev) {
 774                 /* This case shouldn't happen */
 775                 err("pci_dev structure already exists.\n");
 776                 pci_dev_put(dev);
 777                 retval = -1;
 778                 goto err_exit;
 779         }
 780
 781         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
 782         if (num == 0) {
 783                 err("No new device found\n");
 784                 retval = -1;
 785                 goto err_exit;
 786         }
 787
 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                 }
 797         }
 798
 799         pci_bus_assign_resources(bus);
 800         pci_bus_add_devices(bus);
 801
 802         /* associate pci_dev to our representation */
 803         list_for_each (l, &slot->funcs) {
 804                 func = list_entry(l, struct acpiphp_func, sibling);
 805                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
 806                                                         func->function));
 807         }
 808
 809         slot->flags |= SLOT_ENABLED;
 810
 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);
 831                 if (!func->pci_dev)
 832                         continue;
 833
 834                 pci_remove_bus_device(func->pci_dev);
 835                 pci_dev_put(func->pci_dev);
 836                 func->pci_dev = NULL;
 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
 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
 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;
 943                         } else {
 944                                 acpiphp_eject_slot(slot);
 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
 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);
1071         acpiphp_configure_ioapics(handle);
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
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 };
1123         struct acpi_device *device;
1124
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         }
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
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);
1225                 if (!(acpiphp_disable_slot(func->slot)))
1226                         acpiphp_eject_slot(func->slot);
1227                 break;
1228
1229         default:
1230                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1231                 break;
1232         }
1233 }
1234
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 }
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 {
1288         int num = 0;
1289
1290         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1291                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1292
1293         if (num <= 0)
1294                 return -1;
1295         else
1296                 acpi_pci_register_driver(&acpi_pci_hp_driver);
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 {
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;
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");
1330                 num_slots += bridge->nr_slots;
1331         }
1332
1333         dbg("Total %d slots\n", num_slots);
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
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
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 {
1441         return (slot->flags & SLOT_POWEREDON);
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;
1479         struct pci_bus *pci_bus = slot->bridge->pci_bus;
1480
1481         address = (pci_domain_nr(pci_bus) << 16) |
1482                   (pci_bus->number << 8) |
1483                   slot->device;
1484
1485         return address;
1486 }