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 static void acpiphp_sanitize_bus(struct pci_bus *bus);
  62 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
  63
  64
  65 /*
  66  * initialization & terminatation routines
  67  */
  68
  69 /**
  70  * is_ejectable - determine if a slot is ejectable
  71  * @handle: handle to acpi namespace
  72  *
  73  * Ejectable slot should satisfy at least these conditions:
  74  *
  75  *  1. has _ADR method
  76  *  2. has _EJ0 method
  77  *
  78  * optionally
  79  *
  80  *  1. has _STA method
  81  *  2. has _PS0 method
  82  *  3. has _PS3 method
  83  *  4. ..
  84  *
  85  */
  86 static int is_ejectable(acpi_handle handle)
  87 {
  88         acpi_status status;
  89         acpi_handle tmp;
  90
  91         status = acpi_get_handle(handle, "_ADR", &tmp);
  92         if (ACPI_FAILURE(status)) {
  93                 return 0;
  94         }
  95
  96         status = acpi_get_handle(handle, "_EJ0", &tmp);
  97         if (ACPI_FAILURE(status)) {
  98                 return 0;
  99         }
 100
 101         return 1;
 102 }
 103
 104
 105 /* callback routine to check the existence of ejectable slots */
 106 static acpi_status
 107 is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 108 {
 109         int *count = (int *)context;
 110
 111         if (is_ejectable(handle)) {
 112                 (*count)++;
 113                 /* only one ejectable slot is enough */
 114                 return AE_CTRL_TERMINATE;
 115         } else {
 116                 return AE_OK;
 117         }
 118 }
 119
 120
 121 /* callback routine to register each ACPI PCI slot object */
 122 static acpi_status
 123 register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 124 {
 125         struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 126         struct acpiphp_slot *slot;
 127         struct acpiphp_func *newfunc;
 128         acpi_handle tmp;
 129         acpi_status status = AE_OK;
 130         unsigned long adr, sun;
 131         int device, function;
 132         static int num_slots = 0;       /* XXX if we support I/O node hotplug... */
 133
 134         status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 135
 136         if (ACPI_FAILURE(status))
 137                 return AE_OK;
 138
 139         status = acpi_get_handle(handle, "_EJ0", &tmp);
 140
 141         if (ACPI_FAILURE(status))
 142                 return AE_OK;
 143
 144         device = (adr >> 16) & 0xffff;
 145         function = adr & 0xffff;
 146
 147         newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 148         if (!newfunc)
 149                 return AE_NO_MEMORY;
 150         memset(newfunc, 0, sizeof(struct acpiphp_func));
 151
 152         INIT_LIST_HEAD(&newfunc->sibling);
 153         newfunc->handle = handle;
 154         newfunc->function = function;
 155         newfunc->flags = FUNC_HAS_EJ0;
 156
 157         if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 158                 newfunc->flags |= FUNC_HAS_STA;
 159
 160         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
 161                 newfunc->flags |= FUNC_HAS_PS0;
 162
 163         if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 164                 newfunc->flags |= FUNC_HAS_PS3;
 165
 166         status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 167         if (ACPI_FAILURE(status))
 168                 sun = -1;
 169
 170         /* search for objects that share the same slot */
 171         for (slot = bridge->slots; slot; slot = slot->next)
 172                 if (slot->device == device) {
 173                         if (slot->sun != sun)
 174                                 warn("sibling found, but _SUN doesn't match!\n");
 175                         break;
 176                 }
 177
 178         if (!slot) {
 179                 slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 180                 if (!slot) {
 181                         kfree(newfunc);
 182                         return AE_NO_MEMORY;
 183                 }
 184
 185                 memset(slot, 0, sizeof(struct acpiphp_slot));
 186                 slot->bridge = bridge;
 187                 slot->id = num_slots++;
 188                 slot->device = device;
 189                 slot->sun = sun;
 190                 INIT_LIST_HEAD(&slot->funcs);
 191                 init_MUTEX(&slot->crit_sect);
 192
 193                 slot->next = bridge->slots;
 194                 bridge->slots = slot;
 195
 196                 bridge->nr_slots++;
 197
 198                 dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 199                                 slot->sun, pci_domain_nr(bridge->pci_bus),
 200                                 bridge->pci_bus->number, slot->device);
 201         }
 202
 203         newfunc->slot = slot;
 204         list_add_tail(&newfunc->sibling, &slot->funcs);
 205
 206         /* associate corresponding pci_dev */
 207         newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
 208                                          PCI_DEVFN(device, function));
 209         if (newfunc->pci_dev) {
 210                 slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 211         }
 212
 213         /* install notify handler */
 214         status = acpi_install_notify_handler(handle,
 215                                              ACPI_SYSTEM_NOTIFY,
 216                                              handle_hotplug_event_func,
 217                                              newfunc);
 218
 219         if (ACPI_FAILURE(status)) {
 220                 err("failed to register interrupt notify handler\n");
 221                 return status;
 222         }
 223
 224         return AE_OK;
 225 }
 226
 227
 228 /* see if it's worth looking at this bridge */
 229 static int detect_ejectable_slots(acpi_handle *bridge_handle)
 230 {
 231         acpi_status status;
 232         int count;
 233
 234         count = 0;
 235
 236         /* only check slots defined directly below bridge object */
 237         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
 238                                      is_ejectable_slot, (void *)&count, NULL);
 239
 240         return count;
 241 }
 242
 243
 244 /* decode ACPI 2.0 _HPP hot plug parameters */
 245 static void decode_hpp(struct acpiphp_bridge *bridge)
 246 {
 247         acpi_status status;
 248         struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER,
 249                                       .pointer = NULL};
 250         union acpi_object *package;
 251         int i;
 252
 253         /* default numbers */
 254         bridge->hpp.cache_line_size = 0x10;
 255         bridge->hpp.latency_timer = 0x40;
 256         bridge->hpp.enable_SERR = 0;
 257         bridge->hpp.enable_PERR = 0;
 258
 259         status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer);
 260
 261         if (ACPI_FAILURE(status)) {
 262                 dbg("_HPP evaluation failed\n");
 263                 return;
 264         }
 265
 266         package = (union acpi_object *) buffer.pointer;
 267
 268         if (!package || package->type != ACPI_TYPE_PACKAGE ||
 269             package->package.count != 4 || !package->package.elements) {
 270                 err("invalid _HPP object; ignoring\n");
 271                 goto err_exit;
 272         }
 273
 274         for (i = 0; i < 4; i++) {
 275                 if (package->package.elements[i].type != ACPI_TYPE_INTEGER) {
 276                         err("invalid _HPP parameter type; ignoring\n");
 277                         goto err_exit;
 278                 }
 279         }
 280
 281         bridge->hpp.cache_line_size = package->package.elements[0].integer.value;
 282         bridge->hpp.latency_timer = package->package.elements[1].integer.value;
 283         bridge->hpp.enable_SERR = package->package.elements[2].integer.value;
 284         bridge->hpp.enable_PERR = package->package.elements[3].integer.value;
 285
 286         dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n",
 287                 bridge->hpp.cache_line_size,
 288                 bridge->hpp.latency_timer,
 289                 bridge->hpp.enable_SERR,
 290                 bridge->hpp.enable_PERR);
 291
 292         bridge->flags |= BRIDGE_HAS_HPP;
 293
 294  err_exit:
 295         kfree(buffer.pointer);
 296 }
 297
 298
 299 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 300 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 301 {
 302         acpi_status status;
 303
 304         /* decode ACPI 2.0 _HPP (hot plug parameters) */
 305         decode_hpp(bridge);
 306
 307         /* register all slot objects under this bridge */
 308         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 309                                      register_slot, bridge, NULL);
 310
 311         /* install notify handler */
 312         if (bridge->type != BRIDGE_TYPE_HOST) {
 313                 status = acpi_install_notify_handler(bridge->handle,
 314                                              ACPI_SYSTEM_NOTIFY,
 315                                              handle_hotplug_event_bridge,
 316                                              bridge);
 317
 318                 if (ACPI_FAILURE(status)) {
 319                         err("failed to register interrupt notify handler\n");
 320                 }
 321         }
 322
 323         list_add(&bridge->list, &bridge_list);
 324 }
 325
 326
 327 /* allocate and initialize host bridge data structure */
 328 static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 329 {
 330         struct acpiphp_bridge *bridge;
 331
 332         bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 333         if (bridge == NULL)
 334                 return;
 335
 336         memset(bridge, 0, sizeof(struct acpiphp_bridge));
 337
 338         bridge->type = BRIDGE_TYPE_HOST;
 339         bridge->handle = handle;
 340
 341         bridge->pci_bus = pci_bus;
 342
 343         spin_lock_init(&bridge->res_lock);
 344
 345         init_bridge_misc(bridge);
 346 }
 347
 348
 349 /* allocate and initialize PCI-to-PCI bridge data structure */
 350 static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 351 {
 352         struct acpiphp_bridge *bridge;
 353
 354         bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 355         if (bridge == NULL) {
 356                 err("out of memory\n");
 357                 return;
 358         }
 359
 360         memset(bridge, 0, sizeof(struct acpiphp_bridge));
 361
 362         bridge->type = BRIDGE_TYPE_P2P;
 363         bridge->handle = handle;
 364
 365         bridge->pci_dev = pci_dev_get(pci_dev);
 366         bridge->pci_bus = pci_dev->subordinate;
 367         if (!bridge->pci_bus) {
 368                 err("This is not a PCI-to-PCI bridge!\n");
 369                 goto err;
 370         }
 371
 372         spin_lock_init(&bridge->res_lock);
 373
 374         init_bridge_misc(bridge);
 375         return;
 376  err:
 377         pci_dev_put(pci_dev);
 378         kfree(bridge);
 379         return;
 380 }
 381
 382
 383 /* callback routine to find P2P bridges */
 384 static acpi_status
 385 find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 386 {
 387         acpi_status status;
 388         acpi_handle dummy_handle;
 389         unsigned long tmp;
 390         int device, function;
 391         struct pci_dev *dev;
 392         struct pci_bus *pci_bus = context;
 393
 394         status = acpi_get_handle(handle, "_ADR", &dummy_handle);
 395         if (ACPI_FAILURE(status))
 396                 return AE_OK;           /* continue */
 397
 398         status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
 399         if (ACPI_FAILURE(status)) {
 400                 dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
 401                 return AE_OK;
 402         }
 403
 404         device = (tmp >> 16) & 0xffff;
 405         function = tmp & 0xffff;
 406
 407         dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
 408
 409         if (!dev || !dev->subordinate)
 410                 goto out;
 411
 412         /* check if this bridge has ejectable slots */
 413         if (detect_ejectable_slots(handle) > 0) {
 414                 dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 415                 add_p2p_bridge(handle, dev);
 416         }
 417
 418  out:
 419         pci_dev_put(dev);
 420         return AE_OK;
 421 }
 422
 423
 424 /* find hot-pluggable slots, and then find P2P bridge */
 425 static int add_bridge(acpi_handle handle)
 426 {
 427         acpi_status status;
 428         unsigned long tmp;
 429         int seg, bus;
 430         acpi_handle dummy_handle;
 431         struct pci_bus *pci_bus;
 432
 433         /* if the bridge doesn't have _STA, we assume it is always there */
 434         status = acpi_get_handle(handle, "_STA", &dummy_handle);
 435         if (ACPI_SUCCESS(status)) {
 436                 status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
 437                 if (ACPI_FAILURE(status)) {
 438                         dbg("%s: _STA evaluation failure\n", __FUNCTION__);
 439                         return 0;
 440                 }
 441                 if ((tmp & ACPI_STA_FUNCTIONING) == 0)
 442                         /* don't register this object */
 443                         return 0;
 444         }
 445
 446         /* get PCI segment number */
 447         status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
 448
 449         seg = ACPI_SUCCESS(status) ? tmp : 0;
 450
 451         /* get PCI bus number */
 452         status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
 453
 454         if (ACPI_SUCCESS(status)) {
 455                 bus = tmp;
 456         } else {
 457                 warn("can't get bus number, assuming 0\n");
 458                 bus = 0;
 459         }
 460
 461         pci_bus = pci_find_bus(seg, bus);
 462         if (!pci_bus) {
 463                 err("Can't find bus %04x:%02x\n", seg, bus);
 464                 return 0;
 465         }
 466
 467         /* check if this bridge has ejectable slots */
 468         if (detect_ejectable_slots(handle) > 0) {
 469                 dbg("found PCI host-bus bridge with hot-pluggable slots\n");
 470                 add_host_bridge(handle, pci_bus);
 471                 return 0;
 472         }
 473
 474         /* search P2P bridges under this host bridge */
 475         status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
 476                                      find_p2p_bridge, pci_bus, NULL);
 477
 478         if (ACPI_FAILURE(status))
 479                 warn("find_p2p_bridge faied (error code = 0x%x)\n",status);
 480
 481         return 0;
 482 }
 483
 484 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
 485 {
 486         struct list_head *head;
 487         list_for_each(head, &bridge_list) {
 488                 struct acpiphp_bridge *bridge = list_entry(head,
 489                                                 struct acpiphp_bridge, list);
 490                 if (bridge->handle == handle)
 491                         return bridge;
 492         }
 493
 494         return NULL;
 495 }
 496
 497 static void cleanup_bridge(struct acpiphp_bridge *bridge)
 498 {
 499         struct list_head *list, *tmp;
 500         struct acpiphp_slot *slot;
 501         acpi_status status;
 502         acpi_handle handle = bridge->handle;
 503
 504         status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 505                                             handle_hotplug_event_bridge);
 506         if (ACPI_FAILURE(status))
 507                 err("failed to remove notify handler\n");
 508
 509         slot = bridge->slots;
 510         while (slot) {
 511                 struct acpiphp_slot *next = slot->next;
 512                 list_for_each_safe (list, tmp, &slot->funcs) {
 513                         struct acpiphp_func *func;
 514                         func = list_entry(list, struct acpiphp_func, sibling);
 515                         status = acpi_remove_notify_handler(func->handle,
 516                                                 ACPI_SYSTEM_NOTIFY,
 517                                                 handle_hotplug_event_func);
 518                         if (ACPI_FAILURE(status))
 519                                 err("failed to remove notify handler\n");
 520                         pci_dev_put(func->pci_dev);
 521                         list_del(list);
 522                         kfree(func);
 523                 }
 524                 kfree(slot);
 525                 slot = next;
 526         }
 527
 528         pci_dev_put(bridge->pci_dev);
 529         list_del(&bridge->list);
 530         kfree(bridge);
 531 }
 532
 533 static acpi_status
 534 cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 535 {
 536         struct acpiphp_bridge *bridge;
 537
 538         if (!(bridge = acpiphp_handle_to_bridge(handle)))
 539                 return AE_OK;
 540         cleanup_bridge(bridge);
 541         return AE_OK;
 542 }
 543
 544 static void remove_bridge(acpi_handle handle)
 545 {
 546         struct acpiphp_bridge *bridge;
 547
 548         bridge = acpiphp_handle_to_bridge(handle);
 549         if (bridge) {
 550                 cleanup_bridge(bridge);
 551         } else {
 552                 /* clean-up p2p bridges under this host bridge */
 553                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 554                                 (u32)1, cleanup_p2p_bridge, NULL, NULL);
 555         }
 556 }
 557
 558 static struct pci_dev * get_apic_pci_info(acpi_handle handle)
 559 {
 560         struct acpi_pci_id id;
 561         struct pci_bus *bus;
 562         struct pci_dev *dev;
 563
 564         if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
 565                 return NULL;
 566
 567         bus = pci_find_bus(id.segment, id.bus);
 568         if (!bus)
 569                 return NULL;
 570
 571         dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
 572         if (!dev)
 573                 return NULL;
 574
 575         if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
 576             (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
 577         {
 578                 pci_dev_put(dev);
 579                 return NULL;
 580         }
 581
 582         return dev;
 583 }
 584
 585 static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
 586 {
 587         acpi_status status;
 588         int result = -1;
 589         unsigned long gsb;
 590         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 591         union acpi_object *obj;
 592         void *table;
 593
 594         status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
 595         if (ACPI_SUCCESS(status)) {
 596                 *gsi_base = (u32)gsb;
 597                 return 0;
 598         }
 599
 600         status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
 601         if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
 602                 return -1;
 603
 604         obj = buffer.pointer;
 605         if (obj->type != ACPI_TYPE_BUFFER)
 606                 goto out;
 607
 608         table = obj->buffer.pointer;
 609         switch (((acpi_table_entry_header *)table)->type) {
 610         case ACPI_MADT_IOSAPIC:
 611                 *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base;
 612                 result = 0;
 613                 break;
 614         case ACPI_MADT_IOAPIC:
 615                 *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base;
 616                 result = 0;
 617                 break;
 618         default:
 619                 break;
 620         }
 621  out:
 622         acpi_os_free(buffer.pointer);
 623         return result;
 624 }
 625
 626 static acpi_status
 627 ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
 628 {
 629         acpi_status status;
 630         unsigned long sta;
 631         acpi_handle tmp;
 632         struct pci_dev *pdev;
 633         u32 gsi_base;
 634         u64 phys_addr;
 635
 636         /* Evaluate _STA if present */
 637         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
 638         if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
 639                 return AE_CTRL_DEPTH;
 640
 641         /* Scan only PCI bus scope */
 642         status = acpi_get_handle(handle, "_HID", &tmp);
 643         if (ACPI_SUCCESS(status))
 644                 return AE_CTRL_DEPTH;
 645
 646         if (get_gsi_base(handle, &gsi_base))
 647                 return AE_OK;
 648
 649         pdev = get_apic_pci_info(handle);
 650         if (!pdev)
 651                 return AE_OK;
 652
 653         if (pci_enable_device(pdev)) {
 654                 pci_dev_put(pdev);
 655                 return AE_OK;
 656         }
 657
 658         pci_set_master(pdev);
 659
 660         if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
 661                 pci_disable_device(pdev);
 662                 pci_dev_put(pdev);
 663                 return AE_OK;
 664         }
 665
 666         phys_addr = pci_resource_start(pdev, 0);
 667         if (acpi_register_ioapic(handle, phys_addr, gsi_base)) {
 668                 pci_release_region(pdev, 0);
 669                 pci_disable_device(pdev);
 670                 pci_dev_put(pdev);
 671                 return AE_OK;
 672         }
 673
 674         return AE_OK;
 675 }
 676
 677 static int acpiphp_configure_ioapics(acpi_handle handle)
 678 {
 679         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
 680                             ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
 681         return 0;
 682 }
 683
 684 static int power_on_slot(struct acpiphp_slot *slot)
 685 {
 686         acpi_status status;
 687         struct acpiphp_func *func;
 688         struct list_head *l;
 689         int retval = 0;
 690
 691         /* if already enabled, just skip */
 692         if (slot->flags & SLOT_POWEREDON)
 693                 goto err_exit;
 694
 695         list_for_each (l, &slot->funcs) {
 696                 func = list_entry(l, struct acpiphp_func, sibling);
 697
 698                 if (func->flags & FUNC_HAS_PS0) {
 699                         dbg("%s: executing _PS0\n", __FUNCTION__);
 700                         status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
 701                         if (ACPI_FAILURE(status)) {
 702                                 warn("%s: _PS0 failed\n", __FUNCTION__);
 703                                 retval = -1;
 704                                 goto err_exit;
 705                         } else
 706                                 break;
 707                 }
 708         }
 709
 710         /* TBD: evaluate _STA to check if the slot is enabled */
 711
 712         slot->flags |= SLOT_POWEREDON;
 713
 714  err_exit:
 715         return retval;
 716 }
 717
 718
 719 static int power_off_slot(struct acpiphp_slot *slot)
 720 {
 721         acpi_status status;
 722         struct acpiphp_func *func;
 723         struct list_head *l;
 724
 725         int retval = 0;
 726
 727         /* if already disabled, just skip */
 728         if ((slot->flags & SLOT_POWEREDON) == 0)
 729                 goto err_exit;
 730
 731         list_for_each (l, &slot->funcs) {
 732                 func = list_entry(l, struct acpiphp_func, sibling);
 733
 734                 if (func->flags & FUNC_HAS_PS3) {
 735                         status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
 736                         if (ACPI_FAILURE(status)) {
 737                                 warn("%s: _PS3 failed\n", __FUNCTION__);
 738                                 retval = -1;
 739                                 goto err_exit;
 740                         } else
 741                                 break;
 742                 }
 743         }
 744
 745         /* TBD: evaluate _STA to check if the slot is disabled */
 746
 747         slot->flags &= (~SLOT_POWEREDON);
 748
 749  err_exit:
 750         return retval;
 751 }
 752
 753
 754 /**
 755  * enable_device - enable, configure a slot
 756  * @slot: slot to be enabled
 757  *
 758  * This function should be called per *physical slot*,
 759  * not per each slot object in ACPI namespace.
 760  *
 761  */
 762 static int enable_device(struct acpiphp_slot *slot)
 763 {
 764         struct pci_dev *dev;
 765         struct pci_bus *bus = slot->bridge->pci_bus;
 766         struct list_head *l;
 767         struct acpiphp_func *func;
 768         int retval = 0;
 769         int num, max, pass;
 770
 771         if (slot->flags & SLOT_ENABLED)
 772                 goto err_exit;
 773
 774         /* sanity check: dev should be NULL when hot-plugged in */
 775         dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
 776         if (dev) {
 777                 /* This case shouldn't happen */
 778                 err("pci_dev structure already exists.\n");
 779                 pci_dev_put(dev);
 780                 retval = -1;
 781                 goto err_exit;
 782         }
 783
 784         num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
 785         if (num == 0) {
 786                 err("No new device found\n");
 787                 retval = -1;
 788                 goto err_exit;
 789         }
 790
 791         max = bus->secondary;
 792         for (pass = 0; pass < 2; pass++) {
 793                 list_for_each_entry(dev, &bus->devices, bus_list) {
 794                         if (PCI_SLOT(dev->devfn) != slot->device)
 795                                 continue;
 796                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 797                             dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 798                                 max = pci_scan_bridge(bus, dev, max, pass);
 799                                 if (pass && dev->subordinate)
 800                                         pci_bus_size_bridges(dev->subordinate);
 801                         }
 802                 }
 803         }
 804
 805         pci_bus_assign_resources(bus);
 806         acpiphp_sanitize_bus(bus);
 807         pci_enable_bridges(bus);
 808         pci_bus_add_devices(bus);
 809         acpiphp_set_hpp_values(DEVICE_ACPI_HANDLE(&bus->self->dev), bus);
 810         acpiphp_configure_ioapics(DEVICE_ACPI_HANDLE(&bus->self->dev));
 811
 812         /* associate pci_dev to our representation */
 813         list_for_each (l, &slot->funcs) {
 814                 func = list_entry(l, struct acpiphp_func, sibling);
 815                 func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
 816                                                         func->function));
 817         }
 818
 819         slot->flags |= SLOT_ENABLED;
 820
 821  err_exit:
 822         return retval;
 823 }
 824
 825
 826 /**
 827  * disable_device - disable a slot
 828  */
 829 static int disable_device(struct acpiphp_slot *slot)
 830 {
 831         int retval = 0;
 832         struct acpiphp_func *func;
 833         struct list_head *l;
 834
 835         /* is this slot already disabled? */
 836         if (!(slot->flags & SLOT_ENABLED))
 837                 goto err_exit;
 838
 839         list_for_each (l, &slot->funcs) {
 840                 func = list_entry(l, struct acpiphp_func, sibling);
 841                 if (!func->pci_dev)
 842                         continue;
 843
 844                 pci_remove_bus_device(func->pci_dev);
 845                 pci_dev_put(func->pci_dev);
 846                 func->pci_dev = NULL;
 847         }
 848
 849         slot->flags &= (~SLOT_ENABLED);
 850
 851  err_exit:
 852         return retval;
 853 }
 854
 855
 856 /**
 857  * get_slot_status - get ACPI slot status
 858  *
 859  * if a slot has _STA for each function and if any one of them
 860  * returned non-zero status, return it
 861  *
 862  * if a slot doesn't have _STA and if any one of its functions'
 863  * configuration space is configured, return 0x0f as a _STA
 864  *
 865  * otherwise return 0
 866  */
 867 static unsigned int get_slot_status(struct acpiphp_slot *slot)
 868 {
 869         acpi_status status;
 870         unsigned long sta = 0;
 871         u32 dvid;
 872         struct list_head *l;
 873         struct acpiphp_func *func;
 874
 875         list_for_each (l, &slot->funcs) {
 876                 func = list_entry(l, struct acpiphp_func, sibling);
 877
 878                 if (func->flags & FUNC_HAS_STA) {
 879                         status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
 880                         if (ACPI_SUCCESS(status) && sta)
 881                                 break;
 882                 } else {
 883                         pci_bus_read_config_dword(slot->bridge->pci_bus,
 884                                                   PCI_DEVFN(slot->device,
 885                                                             func->function),
 886                                                   PCI_VENDOR_ID, &dvid);
 887                         if (dvid != 0xffffffff) {
 888                                 sta = ACPI_STA_ALL;
 889                                 break;
 890                         }
 891                 }
 892         }
 893
 894         return (unsigned int)sta;
 895 }
 896
 897 /**
 898  * acpiphp_eject_slot - physically eject the slot
 899  */
 900 static int acpiphp_eject_slot(struct acpiphp_slot *slot)
 901 {
 902         acpi_status status;
 903         struct acpiphp_func *func;
 904         struct list_head *l;
 905         struct acpi_object_list arg_list;
 906         union acpi_object arg;
 907
 908         list_for_each (l, &slot->funcs) {
 909                 func = list_entry(l, struct acpiphp_func, sibling);
 910
 911                 /* We don't want to call _EJ0 on non-existing functions. */
 912                 if ((func->flags & FUNC_HAS_EJ0)) {
 913                         /* _EJ0 method take one argument */
 914                         arg_list.count = 1;
 915                         arg_list.pointer = &arg;
 916                         arg.type = ACPI_TYPE_INTEGER;
 917                         arg.integer.value = 1;
 918
 919                         status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
 920                         if (ACPI_FAILURE(status)) {
 921                                 warn("%s: _EJ0 failed\n", __FUNCTION__);
 922                                 return -1;
 923                         } else
 924                                 break;
 925                 }
 926         }
 927         return 0;
 928 }
 929
 930 /**
 931  * acpiphp_check_bridge - re-enumerate devices
 932  *
 933  * Iterate over all slots under this bridge and make sure that if a
 934  * card is present they are enabled, and if not they are disabled.
 935  */
 936 static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
 937 {
 938         struct acpiphp_slot *slot;
 939         int retval = 0;
 940         int enabled, disabled;
 941
 942         enabled = disabled = 0;
 943
 944         for (slot = bridge->slots; slot; slot = slot->next) {
 945                 unsigned int status = get_slot_status(slot);
 946                 if (slot->flags & SLOT_ENABLED) {
 947                         if (status == ACPI_STA_ALL)
 948                                 continue;
 949                         retval = acpiphp_disable_slot(slot);
 950                         if (retval) {
 951                                 err("Error occurred in disabling\n");
 952                                 goto err_exit;
 953                         } else {
 954                                 acpiphp_eject_slot(slot);
 955                         }
 956                         disabled++;
 957                 } else {
 958                         if (status != ACPI_STA_ALL)
 959                                 continue;
 960                         retval = acpiphp_enable_slot(slot);
 961                         if (retval) {
 962                                 err("Error occurred in enabling\n");
 963                                 goto err_exit;
 964                         }
 965                         enabled++;
 966                 }
 967         }
 968
 969         dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);
 970
 971  err_exit:
 972         return retval;
 973 }
 974
 975 static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
 976 {
 977         u16 pci_cmd, pci_bctl;
 978         struct pci_dev *cdev;
 979
 980         /* Program hpp values for this device */
 981         if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
 982                         (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
 983                         (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
 984                 return;
 985         pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
 986                         bridge->hpp.cache_line_size);
 987         pci_write_config_byte(dev, PCI_LATENCY_TIMER,
 988                         bridge->hpp.latency_timer);
 989         pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
 990         if (bridge->hpp.enable_SERR)
 991                 pci_cmd |= PCI_COMMAND_SERR;
 992         else
 993                 pci_cmd &= ~PCI_COMMAND_SERR;
 994         if (bridge->hpp.enable_PERR)
 995                 pci_cmd |= PCI_COMMAND_PARITY;
 996         else
 997                 pci_cmd &= ~PCI_COMMAND_PARITY;
 998         pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
 999
1000         /* Program bridge control value and child devices */
1001         if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1002                 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1003                                 bridge->hpp.latency_timer);
1004                 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1005                 if (bridge->hpp.enable_SERR)
1006                         pci_bctl |= PCI_BRIDGE_CTL_SERR;
1007                 else
1008                         pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1009                 if (bridge->hpp.enable_PERR)
1010                         pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1011                 else
1012                         pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
1013                 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1014                 if (dev->subordinate) {
1015                         list_for_each_entry(cdev, &dev->subordinate->devices,
1016                                         bus_list)
1017                                 program_hpp(cdev, bridge);
1018                 }
1019         }
1020 }
1021
1022 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
1023 {
1024         struct acpiphp_bridge bridge;
1025         struct pci_dev *dev;
1026
1027         memset(&bridge, 0, sizeof(bridge));
1028         bridge.handle = handle;
1029         decode_hpp(&bridge);
1030         list_for_each_entry(dev, &bus->devices, bus_list)
1031                 program_hpp(dev, &bridge);
1032
1033 }
1034
1035 /*
1036  * Remove devices for which we could not assign resources, call
1037  * arch specific code to fix-up the bus
1038  */
1039 static void acpiphp_sanitize_bus(struct pci_bus *bus)
1040 {
1041         struct pci_dev *dev;
1042         int i;
1043         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
1044
1045         list_for_each_entry(dev, &bus->devices, bus_list) {
1046                 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
1047                         struct resource *res = &dev->resource[i];
1048                         if ((res->flags & type_mask) && !res->start &&
1049                                         res->end) {
1050                                 /* Could not assign a required resources
1051                                  * for this device, remove it */
1052                                 pci_remove_bus_device(dev);
1053                                 break;
1054                         }
1055                 }
1056         }
1057 }
1058
1059 /* Program resources in newly inserted bridge */
1060 static int acpiphp_configure_bridge (acpi_handle handle)
1061 {
1062         struct acpi_pci_id pci_id;
1063         struct pci_bus *bus;
1064
1065         if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
1066                 err("cannot get PCI domain and bus number for bridge\n");
1067                 return -EINVAL;
1068         }
1069         bus = pci_find_bus(pci_id.segment, pci_id.bus);
1070         if (!bus) {
1071                 err("cannot find bus %d:%d\n",
1072                                 pci_id.segment, pci_id.bus);
1073                 return -EINVAL;
1074         }
1075
1076         pci_bus_size_bridges(bus);
1077         pci_bus_assign_resources(bus);
1078         acpiphp_sanitize_bus(bus);
1079         acpiphp_set_hpp_values(handle, bus);
1080         pci_enable_bridges(bus);
1081         acpiphp_configure_ioapics(handle);
1082         return 0;
1083 }
1084
1085 static void handle_bridge_insertion(acpi_handle handle, u32 type)
1086 {
1087         struct acpi_device *device, *pdevice;
1088         acpi_handle phandle;
1089
1090         if ((type != ACPI_NOTIFY_BUS_CHECK) &&
1091                         (type != ACPI_NOTIFY_DEVICE_CHECK)) {
1092                 err("unexpected notification type %d\n", type);
1093                 return;
1094         }
1095
1096         acpi_get_parent(handle, &phandle);
1097         if (acpi_bus_get_device(phandle, &pdevice)) {
1098                 dbg("no parent device, assuming NULL\n");
1099                 pdevice = NULL;
1100         }
1101         if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
1102                 err("cannot add bridge to acpi list\n");
1103                 return;
1104         }
1105         if (!acpiphp_configure_bridge(handle) &&
1106                 !acpi_bus_start(device))
1107                 add_bridge(handle);
1108         else
1109                 err("cannot configure and start bridge\n");
1110
1111 }
1112
1113 /*
1114  * ACPI event handlers
1115  */
1116
1117 /**
1118  * handle_hotplug_event_bridge - handle ACPI event on bridges
1119  *
1120  * @handle: Notify()'ed acpi_handle
1121  * @type: Notify code
1122  * @context: pointer to acpiphp_bridge structure
1123  *
1124  * handles ACPI event notification on {host,p2p} bridges
1125  *
1126  */
1127 static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
1128 {
1129         struct acpiphp_bridge *bridge;
1130         char objname[64];
1131         struct acpi_buffer buffer = { .length = sizeof(objname),
1132                                       .pointer = objname };
1133         struct acpi_device *device;
1134
1135         if (acpi_bus_get_device(handle, &device)) {
1136                 /* This bridge must have just been physically inserted */
1137                 handle_bridge_insertion(handle, type);
1138                 return;
1139         }
1140
1141         bridge = acpiphp_handle_to_bridge(handle);
1142         if (!bridge) {
1143                 err("cannot get bridge info\n");
1144                 return;
1145         }
1146
1147         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1148
1149         switch (type) {
1150         case ACPI_NOTIFY_BUS_CHECK:
1151                 /* bus re-enumerate */
1152                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1153                 acpiphp_check_bridge(bridge);
1154                 break;
1155
1156         case ACPI_NOTIFY_DEVICE_CHECK:
1157                 /* device check */
1158                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1159                 acpiphp_check_bridge(bridge);
1160                 break;
1161
1162         case ACPI_NOTIFY_DEVICE_WAKE:
1163                 /* wake event */
1164                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1165                 break;
1166
1167         case ACPI_NOTIFY_EJECT_REQUEST:
1168                 /* request device eject */
1169                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1170                 break;
1171
1172         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
1173                 printk(KERN_ERR "Device %s cannot be configured due"
1174                                 " to a frequency mismatch\n", objname);
1175                 break;
1176
1177         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
1178                 printk(KERN_ERR "Device %s cannot be configured due"
1179                                 " to a bus mode mismatch\n", objname);
1180                 break;
1181
1182         case ACPI_NOTIFY_POWER_FAULT:
1183                 printk(KERN_ERR "Device %s has suffered a power fault\n",
1184                                 objname);
1185                 break;
1186
1187         default:
1188                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1189                 break;
1190         }
1191 }
1192
1193 /**
1194  * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
1195  *
1196  * @handle: Notify()'ed acpi_handle
1197  * @type: Notify code
1198  * @context: pointer to acpiphp_func structure
1199  *
1200  * handles ACPI event notification on slots
1201  *
1202  */
1203 static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
1204 {
1205         struct acpiphp_func *func;
1206         char objname[64];
1207         struct acpi_buffer buffer = { .length = sizeof(objname),
1208                                       .pointer = objname };
1209
1210         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1211
1212         func = (struct acpiphp_func *)context;
1213
1214         switch (type) {
1215         case ACPI_NOTIFY_BUS_CHECK:
1216                 /* bus re-enumerate */
1217                 dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1218                 acpiphp_enable_slot(func->slot);
1219                 break;
1220
1221         case ACPI_NOTIFY_DEVICE_CHECK:
1222                 /* device check : re-enumerate from parent bus */
1223                 dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
1224                 acpiphp_check_bridge(func->slot->bridge);
1225                 break;
1226
1227         case ACPI_NOTIFY_DEVICE_WAKE:
1228                 /* wake event */
1229                 dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
1230                 break;
1231
1232         case ACPI_NOTIFY_EJECT_REQUEST:
1233                 /* request device eject */
1234                 dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1235                 if (!(acpiphp_disable_slot(func->slot)))
1236                         acpiphp_eject_slot(func->slot);
1237                 break;
1238
1239         default:
1240                 warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
1241                 break;
1242         }
1243 }
1244
1245 static int is_root_bridge(acpi_handle handle)
1246 {
1247         acpi_status status;
1248         struct acpi_device_info *info;
1249         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1250         int i;
1251
1252         status = acpi_get_object_info(handle, &buffer);
1253         if (ACPI_SUCCESS(status)) {
1254                 info = buffer.pointer;
1255                 if ((info->valid & ACPI_VALID_HID) &&
1256                         !strcmp(PCI_ROOT_HID_STRING,
1257                                         info->hardware_id.value)) {
1258                         acpi_os_free(buffer.pointer);
1259                         return 1;
1260                 }
1261                 if (info->valid & ACPI_VALID_CID) {
1262                         for (i=0; i < info->compatibility_id.count; i++) {
1263                                 if (!strcmp(PCI_ROOT_HID_STRING,
1264                                         info->compatibility_id.id[i].value)) {
1265                                         acpi_os_free(buffer.pointer);
1266                                         return 1;
1267                                 }
1268                         }
1269                 }
1270         }
1271         return 0;
1272 }
1273
1274 static acpi_status
1275 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
1276 {
1277         int *count = (int *)context;
1278
1279         if (is_root_bridge(handle)) {
1280                 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1281                                 handle_hotplug_event_bridge, NULL);
1282                         (*count)++;
1283         }
1284         return AE_OK ;
1285 }
1286
1287 static struct acpi_pci_driver acpi_pci_hp_driver = {
1288         .add =          add_bridge,
1289         .remove =       remove_bridge,
1290 };
1291
1292 /**
1293  * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
1294  *
1295  */
1296 int __init acpiphp_glue_init(void)
1297 {
1298         int num = 0;
1299
1300         acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1301                         ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
1302
1303         if (num <= 0)
1304                 return -1;
1305         else
1306                 acpi_pci_register_driver(&acpi_pci_hp_driver);
1307
1308         return 0;
1309 }
1310
1311
1312 /**
1313  * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
1314  *
1315  * This function frees all data allocated in acpiphp_glue_init()
1316  */
1317 void __exit acpiphp_glue_exit(void)
1318 {
1319         acpi_pci_unregister_driver(&acpi_pci_hp_driver);
1320 }
1321
1322
1323 /**
1324  * acpiphp_get_num_slots - count number of slots in a system
1325  */
1326 int __init acpiphp_get_num_slots(void)
1327 {
1328         struct list_head *node;
1329         struct acpiphp_bridge *bridge;
1330         int num_slots;
1331
1332         num_slots = 0;
1333
1334         list_for_each (node, &bridge_list) {
1335                 bridge = (struct acpiphp_bridge *)node;
1336                 dbg("Bus %04x:%02x has %d slot%s\n",
1337                                 pci_domain_nr(bridge->pci_bus),
1338                                 bridge->pci_bus->number, bridge->nr_slots,
1339                                 bridge->nr_slots == 1 ? "" : "s");
1340                 num_slots += bridge->nr_slots;
1341         }
1342
1343         dbg("Total %d slots\n", num_slots);
1344         return num_slots;
1345 }
1346
1347
1348 #if 0
1349 /**
1350  * acpiphp_for_each_slot - call function for each slot
1351  * @fn: callback function
1352  * @data: context to be passed to callback function
1353  *
1354  */
1355 static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
1356 {
1357         struct list_head *node;
1358         struct acpiphp_bridge *bridge;
1359         struct acpiphp_slot *slot;
1360         int retval = 0;
1361
1362         list_for_each (node, &bridge_list) {
1363                 bridge = (struct acpiphp_bridge *)node;
1364                 for (slot = bridge->slots; slot; slot = slot->next) {
1365                         retval = fn(slot, data);
1366                         if (!retval)
1367                                 goto err_exit;
1368                 }
1369         }
1370
1371  err_exit:
1372         return retval;
1373 }
1374 #endif
1375
1376 /* search matching slot from id  */
1377 struct acpiphp_slot *get_slot_from_id(int id)
1378 {
1379         struct list_head *node;
1380         struct acpiphp_bridge *bridge;
1381         struct acpiphp_slot *slot;
1382
1383         list_for_each (node, &bridge_list) {
1384                 bridge = (struct acpiphp_bridge *)node;
1385                 for (slot = bridge->slots; slot; slot = slot->next)
1386                         if (slot->id == id)
1387                                 return slot;
1388         }
1389
1390         /* should never happen! */
1391         err("%s: no object for id %d\n", __FUNCTION__, id);
1392         WARN_ON(1);
1393         return NULL;
1394 }
1395
1396
1397 /**
1398  * acpiphp_enable_slot - power on slot
1399  */
1400 int acpiphp_enable_slot(struct acpiphp_slot *slot)
1401 {
1402         int retval;
1403
1404         down(&slot->crit_sect);
1405
1406         /* wake up all functions */
1407         retval = power_on_slot(slot);
1408         if (retval)
1409                 goto err_exit;
1410
1411         if (get_slot_status(slot) == ACPI_STA_ALL)
1412                 /* configure all functions */
1413                 retval = enable_device(slot);
1414
1415  err_exit:
1416         up(&slot->crit_sect);
1417         return retval;
1418 }
1419
1420 /**
1421  * acpiphp_disable_slot - power off slot
1422  */
1423 int acpiphp_disable_slot(struct acpiphp_slot *slot)
1424 {
1425         int retval = 0;
1426
1427         down(&slot->crit_sect);
1428
1429         /* unconfigure all functions */
1430         retval = disable_device(slot);
1431         if (retval)
1432                 goto err_exit;
1433
1434         /* power off all functions */
1435         retval = power_off_slot(slot);
1436         if (retval)
1437                 goto err_exit;
1438
1439  err_exit:
1440         up(&slot->crit_sect);
1441         return retval;
1442 }
1443
1444
1445 /*
1446  * slot enabled:  1
1447  * slot disabled: 0
1448  */
1449 u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1450 {
1451         return (slot->flags & SLOT_POWEREDON);
1452 }
1453
1454
1455 /*
1456  * latch closed:  1
1457  * latch   open:  0
1458  */
1459 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1460 {
1461         unsigned int sta;
1462
1463         sta = get_slot_status(slot);
1464
1465         return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
1466 }
1467
1468
1469 /*
1470  * adapter presence : 1
1471  *          absence : 0
1472  */
1473 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1474 {
1475         unsigned int sta;
1476
1477         sta = get_slot_status(slot);
1478
1479         return (sta == 0) ? 0 : 1;
1480 }
1481
1482
1483 /*
1484  * pci address (seg/bus/dev)
1485  */
1486 u32 acpiphp_get_address(struct acpiphp_slot *slot)
1487 {
1488         u32 address;
1489         struct pci_bus *pci_bus = slot->bridge->pci_bus;
1490
1491         address = (pci_domain_nr(pci_bus) << 16) |
1492                   (pci_bus->number << 8) |
1493                   slot->device;
1494
1495         return address;
1496 }