drivers/pci/hotplug/cpqphp_ctrl.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Compaq Hot Plug Controller Driver
   4  *
   5  * Copyright (C) 1995,2001 Compaq Computer Corporation
   6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   7  * Copyright (C) 2001 IBM Corp.
   8  *
   9  * All rights reserved.
  10  *
  11  * Send feedback to <greg@kroah.com>
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/slab.h>
  19 #include <linux/workqueue.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/delay.h>
  22 #include <linux/wait.h>
  23 #include <linux/pci.h>
  24 #include <linux/pci_hotplug.h>
  25 #include <linux/kthread.h>
  26 #include "cpqphp.h"
  27
  28 static u32 configure_new_device(struct controller *ctrl, struct pci_func *func,
  29                         u8 behind_bridge, struct resource_lists *resources);
  30 static int configure_new_function(struct controller *ctrl, struct pci_func *func,
  31                         u8 behind_bridge, struct resource_lists *resources);
  32 static void interrupt_event_handler(struct controller *ctrl);
  33
  34
  35 static struct task_struct *cpqhp_event_thread;
  36 static struct timer_list *pushbutton_pending;   /* = NULL */
  37
  38 /* delay is in jiffies to wait for */
  39 static void long_delay(int delay)
  40 {
  41         /*
  42          * XXX(hch): if someone is bored please convert all callers
  43          * to call msleep_interruptible directly.  They really want
  44          * to specify timeouts in natural units and spend a lot of
  45          * effort converting them to jiffies..
  46          */
  47         msleep_interruptible(jiffies_to_msecs(delay));
  48 }
  49
  50
  51 /* FIXME: The following line needs to be somewhere else... */
  52 #define WRONG_BUS_FREQUENCY 0x07
  53 static u8 handle_switch_change(u8 change, struct controller *ctrl)
  54 {
  55         int hp_slot;
  56         u8 rc = 0;
  57         u16 temp_word;
  58         struct pci_func *func;
  59         struct event_info *taskInfo;
  60
  61         if (!change)
  62                 return 0;
  63
  64         /* Switch Change */
  65         dbg("cpqsbd:  Switch interrupt received.\n");
  66
  67         for (hp_slot = 0; hp_slot < 6; hp_slot++) {
  68                 if (change & (0x1L << hp_slot)) {
  69                         /*
  70                          * this one changed.
  71                          */
  72                         func = cpqhp_slot_find(ctrl->bus,
  73                                 (hp_slot + ctrl->slot_device_offset), 0);
  74
  75                         /* this is the structure that tells the worker thread
  76                          * what to do
  77                          */
  78                         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
  79                         ctrl->next_event = (ctrl->next_event + 1) % 10;
  80                         taskInfo->hp_slot = hp_slot;
  81
  82                         rc++;
  83
  84                         temp_word = ctrl->ctrl_int_comp >> 16;
  85                         func->presence_save = (temp_word >> hp_slot) & 0x01;
  86                         func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
  87
  88                         if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
  89                                 /*
  90                                  * Switch opened
  91                                  */
  92
  93                                 func->switch_save = 0;
  94
  95                                 taskInfo->event_type = INT_SWITCH_OPEN;
  96                         } else {
  97                                 /*
  98                                  * Switch closed
  99                                  */
 100
 101                                 func->switch_save = 0x10;
 102
 103                                 taskInfo->event_type = INT_SWITCH_CLOSE;
 104                         }
 105                 }
 106         }
 107
 108         return rc;
 109 }
 110
 111 /**
 112  * cpqhp_find_slot - find the struct slot of given device
 113  * @ctrl: scan lots of this controller
 114  * @device: the device id to find
 115  */
 116 static struct slot *cpqhp_find_slot(struct controller *ctrl, u8 device)
 117 {
 118         struct slot *slot = ctrl->slot;
 119
 120         while (slot && (slot->device != device))
 121                 slot = slot->next;
 122
 123         return slot;
 124 }
 125
 126
 127 static u8 handle_presence_change(u16 change, struct controller *ctrl)
 128 {
 129         int hp_slot;
 130         u8 rc = 0;
 131         u8 temp_byte;
 132         u16 temp_word;
 133         struct pci_func *func;
 134         struct event_info *taskInfo;
 135         struct slot *p_slot;
 136
 137         if (!change)
 138                 return 0;
 139
 140         /*
 141          * Presence Change
 142          */
 143         dbg("cpqsbd:  Presence/Notify input change.\n");
 144         dbg("         Changed bits are 0x%4.4x\n", change);
 145
 146         for (hp_slot = 0; hp_slot < 6; hp_slot++) {
 147                 if (change & (0x0101 << hp_slot)) {
 148                         /*
 149                          * this one changed.
 150                          */
 151                         func = cpqhp_slot_find(ctrl->bus,
 152                                 (hp_slot + ctrl->slot_device_offset), 0);
 153
 154                         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 155                         ctrl->next_event = (ctrl->next_event + 1) % 10;
 156                         taskInfo->hp_slot = hp_slot;
 157
 158                         rc++;
 159
 160                         p_slot = cpqhp_find_slot(ctrl, hp_slot + (readb(ctrl->hpc_reg + SLOT_MASK) >> 4));
 161                         if (!p_slot)
 162                                 return 0;
 163
 164                         /* If the switch closed, must be a button
 165                          * If not in button mode, nevermind
 166                          */
 167                         if (func->switch_save && (ctrl->push_button == 1)) {
 168                                 temp_word = ctrl->ctrl_int_comp >> 16;
 169                                 temp_byte = (temp_word >> hp_slot) & 0x01;
 170                                 temp_byte |= (temp_word >> (hp_slot + 7)) & 0x02;
 171
 172                                 if (temp_byte != func->presence_save) {
 173                                         /*
 174                                          * button Pressed (doesn't do anything)
 175                                          */
 176                                         dbg("hp_slot %d button pressed\n", hp_slot);
 177                                         taskInfo->event_type = INT_BUTTON_PRESS;
 178                                 } else {
 179                                         /*
 180                                          * button Released - TAKE ACTION!!!!
 181                                          */
 182                                         dbg("hp_slot %d button released\n", hp_slot);
 183                                         taskInfo->event_type = INT_BUTTON_RELEASE;
 184
 185                                         /* Cancel if we are still blinking */
 186                                         if ((p_slot->state == BLINKINGON_STATE)
 187                                             || (p_slot->state == BLINKINGOFF_STATE)) {
 188                                                 taskInfo->event_type = INT_BUTTON_CANCEL;
 189                                                 dbg("hp_slot %d button cancel\n", hp_slot);
 190                                         } else if ((p_slot->state == POWERON_STATE)
 191                                                    || (p_slot->state == POWEROFF_STATE)) {
 192                                                 /* info(msg_button_ignore, p_slot->number); */
 193                                                 taskInfo->event_type = INT_BUTTON_IGNORE;
 194                                                 dbg("hp_slot %d button ignore\n", hp_slot);
 195                                         }
 196                                 }
 197                         } else {
 198                                 /* Switch is open, assume a presence change
 199                                  * Save the presence state
 200                                  */
 201                                 temp_word = ctrl->ctrl_int_comp >> 16;
 202                                 func->presence_save = (temp_word >> hp_slot) & 0x01;
 203                                 func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
 204
 205                                 if ((!(ctrl->ctrl_int_comp & (0x010000 << hp_slot))) ||
 206                                     (!(ctrl->ctrl_int_comp & (0x01000000 << hp_slot)))) {
 207                                         /* Present */
 208                                         taskInfo->event_type = INT_PRESENCE_ON;
 209                                 } else {
 210                                         /* Not Present */
 211                                         taskInfo->event_type = INT_PRESENCE_OFF;
 212                                 }
 213                         }
 214                 }
 215         }
 216
 217         return rc;
 218 }
 219
 220
 221 static u8 handle_power_fault(u8 change, struct controller *ctrl)
 222 {
 223         int hp_slot;
 224         u8 rc = 0;
 225         struct pci_func *func;
 226         struct event_info *taskInfo;
 227
 228         if (!change)
 229                 return 0;
 230
 231         /*
 232          * power fault
 233          */
 234
 235         info("power fault interrupt\n");
 236
 237         for (hp_slot = 0; hp_slot < 6; hp_slot++) {
 238                 if (change & (0x01 << hp_slot)) {
 239                         /*
 240                          * this one changed.
 241                          */
 242                         func = cpqhp_slot_find(ctrl->bus,
 243                                 (hp_slot + ctrl->slot_device_offset), 0);
 244
 245                         taskInfo = &(ctrl->event_queue[ctrl->next_event]);
 246                         ctrl->next_event = (ctrl->next_event + 1) % 10;
 247                         taskInfo->hp_slot = hp_slot;
 248
 249                         rc++;
 250
 251                         if (ctrl->ctrl_int_comp & (0x00000100 << hp_slot)) {
 252                                 /*
 253                                  * power fault Cleared
 254                                  */
 255                                 func->status = 0x00;
 256
 257                                 taskInfo->event_type = INT_POWER_FAULT_CLEAR;
 258                         } else {
 259                                 /*
 260                                  * power fault
 261                                  */
 262                                 taskInfo->event_type = INT_POWER_FAULT;
 263
 264                                 if (ctrl->rev < 4) {
 265                                         amber_LED_on(ctrl, hp_slot);
 266                                         green_LED_off(ctrl, hp_slot);
 267                                         set_SOGO(ctrl);
 268
 269                                         /* this is a fatal condition, we want
 270                                          * to crash the machine to protect from
 271                                          * data corruption. simulated_NMI
 272                                          * shouldn't ever return */
 273                                         /* FIXME
 274                                         simulated_NMI(hp_slot, ctrl); */
 275
 276                                         /* The following code causes a software
 277                                          * crash just in case simulated_NMI did
 278                                          * return */
 279                                         /*FIXME
 280                                         panic(msg_power_fault); */
 281                                 } else {
 282                                         /* set power fault status for this board */
 283                                         func->status = 0xFF;
 284                                         info("power fault bit %x set\n", hp_slot);
 285                                 }
 286                         }
 287                 }
 288         }
 289
 290         return rc;
 291 }
 292
 293
 294 /**
 295  * sort_by_size - sort nodes on the list by their length, smallest first.
 296  * @head: list to sort
 297  */
 298 static int sort_by_size(struct pci_resource **head)
 299 {
 300         struct pci_resource *current_res;
 301         struct pci_resource *next_res;
 302         int out_of_order = 1;
 303
 304         if (!(*head))
 305                 return 1;
 306
 307         if (!((*head)->next))
 308                 return 0;
 309
 310         while (out_of_order) {
 311                 out_of_order = 0;
 312
 313                 /* Special case for swapping list head */
 314                 if (((*head)->next) &&
 315                     ((*head)->length > (*head)->next->length)) {
 316                         out_of_order++;
 317                         current_res = *head;
 318                         *head = (*head)->next;
 319                         current_res->next = (*head)->next;
 320                         (*head)->next = current_res;
 321                 }
 322
 323                 current_res = *head;
 324
 325                 while (current_res->next && current_res->next->next) {
 326                         if (current_res->next->length > current_res->next->next->length) {
 327                                 out_of_order++;
 328                                 next_res = current_res->next;
 329                                 current_res->next = current_res->next->next;
 330                                 current_res = current_res->next;
 331                                 next_res->next = current_res->next;
 332                                 current_res->next = next_res;
 333                         } else
 334                                 current_res = current_res->next;
 335                 }
 336         }  /* End of out_of_order loop */
 337
 338         return 0;
 339 }
 340
 341
 342 /**
 343  * sort_by_max_size - sort nodes on the list by their length, largest first.
 344  * @head: list to sort
 345  */
 346 static int sort_by_max_size(struct pci_resource **head)
 347 {
 348         struct pci_resource *current_res;
 349         struct pci_resource *next_res;
 350         int out_of_order = 1;
 351
 352         if (!(*head))
 353                 return 1;
 354
 355         if (!((*head)->next))
 356                 return 0;
 357
 358         while (out_of_order) {
 359                 out_of_order = 0;
 360
 361                 /* Special case for swapping list head */
 362                 if (((*head)->next) &&
 363                     ((*head)->length < (*head)->next->length)) {
 364                         out_of_order++;
 365                         current_res = *head;
 366                         *head = (*head)->next;
 367                         current_res->next = (*head)->next;
 368                         (*head)->next = current_res;
 369                 }
 370
 371                 current_res = *head;
 372
 373                 while (current_res->next && current_res->next->next) {
 374                         if (current_res->next->length < current_res->next->next->length) {
 375                                 out_of_order++;
 376                                 next_res = current_res->next;
 377                                 current_res->next = current_res->next->next;
 378                                 current_res = current_res->next;
 379                                 next_res->next = current_res->next;
 380                                 current_res->next = next_res;
 381                         } else
 382                                 current_res = current_res->next;
 383                 }
 384         }  /* End of out_of_order loop */
 385
 386         return 0;
 387 }
 388
 389
 390 /**
 391  * do_pre_bridge_resource_split - find node of resources that are unused
 392  * @head: new list head
 393  * @orig_head: original list head
 394  * @alignment: max node size (?)
 395  */
 396 static struct pci_resource *do_pre_bridge_resource_split(struct pci_resource **head,
 397                                 struct pci_resource **orig_head, u32 alignment)
 398 {
 399         struct pci_resource *prevnode = NULL;
 400         struct pci_resource *node;
 401         struct pci_resource *split_node;
 402         u32 rc;
 403         u32 temp_dword;
 404         dbg("do_pre_bridge_resource_split\n");
 405
 406         if (!(*head) || !(*orig_head))
 407                 return NULL;
 408
 409         rc = cpqhp_resource_sort_and_combine(head);
 410
 411         if (rc)
 412                 return NULL;
 413
 414         if ((*head)->base != (*orig_head)->base)
 415                 return NULL;
 416
 417         if ((*head)->length == (*orig_head)->length)
 418                 return NULL;
 419
 420
 421         /* If we got here, there the bridge requires some of the resource, but
 422          * we may be able to split some off of the front
 423          */
 424
 425         node = *head;
 426
 427         if (node->length & (alignment - 1)) {
 428                 /* this one isn't an aligned length, so we'll make a new entry
 429                  * and split it up.
 430                  */
 431                 split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 432
 433                 if (!split_node)
 434                         return NULL;
 435
 436                 temp_dword = (node->length | (alignment-1)) + 1 - alignment;
 437
 438                 split_node->base = node->base;
 439                 split_node->length = temp_dword;
 440
 441                 node->length -= temp_dword;
 442                 node->base += split_node->length;
 443
 444                 /* Put it in the list */
 445                 *head = split_node;
 446                 split_node->next = node;
 447         }
 448
 449         if (node->length < alignment)
 450                 return NULL;
 451
 452         /* Now unlink it */
 453         if (*head == node) {
 454                 *head = node->next;
 455         } else {
 456                 prevnode = *head;
 457                 while (prevnode->next != node)
 458                         prevnode = prevnode->next;
 459
 460                 prevnode->next = node->next;
 461         }
 462         node->next = NULL;
 463
 464         return node;
 465 }
 466
 467
 468 /**
 469  * do_bridge_resource_split - find one node of resources that aren't in use
 470  * @head: list head
 471  * @alignment: max node size (?)
 472  */
 473 static struct pci_resource *do_bridge_resource_split(struct pci_resource **head, u32 alignment)
 474 {
 475         struct pci_resource *prevnode = NULL;
 476         struct pci_resource *node;
 477         u32 rc;
 478         u32 temp_dword;
 479
 480         rc = cpqhp_resource_sort_and_combine(head);
 481
 482         if (rc)
 483                 return NULL;
 484
 485         node = *head;
 486
 487         while (node->next) {
 488                 prevnode = node;
 489                 node = node->next;
 490                 kfree(prevnode);
 491         }
 492
 493         if (node->length < alignment)
 494                 goto error;
 495
 496         if (node->base & (alignment - 1)) {
 497                 /* Short circuit if adjusted size is too small */
 498                 temp_dword = (node->base | (alignment-1)) + 1;
 499                 if ((node->length - (temp_dword - node->base)) < alignment)
 500                         goto error;
 501
 502                 node->length -= (temp_dword - node->base);
 503                 node->base = temp_dword;
 504         }
 505
 506         if (node->length & (alignment - 1))
 507                 /* There's stuff in use after this node */
 508                 goto error;
 509
 510         return node;
 511 error:
 512         kfree(node);
 513         return NULL;
 514 }
 515
 516
 517 /**
 518  * get_io_resource - find first node of given size not in ISA aliasing window.
 519  * @head: list to search
 520  * @size: size of node to find, must be a power of two.
 521  *
 522  * Description: This function sorts the resource list by size and then returns
 523  * returns the first node of "size" length that is not in the ISA aliasing
 524  * window.  If it finds a node larger than "size" it will split it up.
 525  */
 526 static struct pci_resource *get_io_resource(struct pci_resource **head, u32 size)
 527 {
 528         struct pci_resource *prevnode;
 529         struct pci_resource *node;
 530         struct pci_resource *split_node;
 531         u32 temp_dword;
 532
 533         if (!(*head))
 534                 return NULL;
 535
 536         if (cpqhp_resource_sort_and_combine(head))
 537                 return NULL;
 538
 539         if (sort_by_size(head))
 540                 return NULL;
 541
 542         for (node = *head; node; node = node->next) {
 543                 if (node->length < size)
 544                         continue;
 545
 546                 if (node->base & (size - 1)) {
 547                         /* this one isn't base aligned properly
 548                          * so we'll make a new entry and split it up
 549                          */
 550                         temp_dword = (node->base | (size-1)) + 1;
 551
 552                         /* Short circuit if adjusted size is too small */
 553                         if ((node->length - (temp_dword - node->base)) < size)
 554                                 continue;
 555
 556                         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 557
 558                         if (!split_node)
 559                                 return NULL;
 560
 561                         split_node->base = node->base;
 562                         split_node->length = temp_dword - node->base;
 563                         node->base = temp_dword;
 564                         node->length -= split_node->length;
 565
 566                         /* Put it in the list */
 567                         split_node->next = node->next;
 568                         node->next = split_node;
 569                 } /* End of non-aligned base */
 570
 571                 /* Don't need to check if too small since we already did */
 572                 if (node->length > size) {
 573                         /* this one is longer than we need
 574                          * so we'll make a new entry and split it up
 575                          */
 576                         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 577
 578                         if (!split_node)
 579                                 return NULL;
 580
 581                         split_node->base = node->base + size;
 582                         split_node->length = node->length - size;
 583                         node->length = size;
 584
 585                         /* Put it in the list */
 586                         split_node->next = node->next;
 587                         node->next = split_node;
 588                 }  /* End of too big on top end */
 589
 590                 /* For IO make sure it's not in the ISA aliasing space */
 591                 if (node->base & 0x300L)
 592                         continue;
 593
 594                 /* If we got here, then it is the right size
 595                  * Now take it out of the list and break
 596                  */
 597                 if (*head == node) {
 598                         *head = node->next;
 599                 } else {
 600                         prevnode = *head;
 601                         while (prevnode->next != node)
 602                                 prevnode = prevnode->next;
 603
 604                         prevnode->next = node->next;
 605                 }
 606                 node->next = NULL;
 607                 break;
 608         }
 609
 610         return node;
 611 }
 612
 613
 614 /**
 615  * get_max_resource - get largest node which has at least the given size.
 616  * @head: the list to search the node in
 617  * @size: the minimum size of the node to find
 618  *
 619  * Description: Gets the largest node that is at least "size" big from the
 620  * list pointed to by head.  It aligns the node on top and bottom
 621  * to "size" alignment before returning it.
 622  */
 623 static struct pci_resource *get_max_resource(struct pci_resource **head, u32 size)
 624 {
 625         struct pci_resource *max;
 626         struct pci_resource *temp;
 627         struct pci_resource *split_node;
 628         u32 temp_dword;
 629
 630         if (cpqhp_resource_sort_and_combine(head))
 631                 return NULL;
 632
 633         if (sort_by_max_size(head))
 634                 return NULL;
 635
 636         for (max = *head; max; max = max->next) {
 637                 /* If not big enough we could probably just bail,
 638                  * instead we'll continue to the next.
 639                  */
 640                 if (max->length < size)
 641                         continue;
 642
 643                 if (max->base & (size - 1)) {
 644                         /* this one isn't base aligned properly
 645                          * so we'll make a new entry and split it up
 646                          */
 647                         temp_dword = (max->base | (size-1)) + 1;
 648
 649                         /* Short circuit if adjusted size is too small */
 650                         if ((max->length - (temp_dword - max->base)) < size)
 651                                 continue;
 652
 653                         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 654
 655                         if (!split_node)
 656                                 return NULL;
 657
 658                         split_node->base = max->base;
 659                         split_node->length = temp_dword - max->base;
 660                         max->base = temp_dword;
 661                         max->length -= split_node->length;
 662
 663                         split_node->next = max->next;
 664                         max->next = split_node;
 665                 }
 666
 667                 if ((max->base + max->length) & (size - 1)) {
 668                         /* this one isn't end aligned properly at the top
 669                          * so we'll make a new entry and split it up
 670                          */
 671                         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 672
 673                         if (!split_node)
 674                                 return NULL;
 675                         temp_dword = ((max->base + max->length) & ~(size - 1));
 676                         split_node->base = temp_dword;
 677                         split_node->length = max->length + max->base
 678                                              - split_node->base;
 679                         max->length -= split_node->length;
 680
 681                         split_node->next = max->next;
 682                         max->next = split_node;
 683                 }
 684
 685                 /* Make sure it didn't shrink too much when we aligned it */
 686                 if (max->length < size)
 687                         continue;
 688
 689                 /* Now take it out of the list */
 690                 temp = *head;
 691                 if (temp == max) {
 692                         *head = max->next;
 693                 } else {
 694                         while (temp && temp->next != max)
 695                                 temp = temp->next;
 696
 697                         if (temp)
 698                                 temp->next = max->next;
 699                 }
 700
 701                 max->next = NULL;
 702                 break;
 703         }
 704
 705         return max;
 706 }
 707
 708
 709 /**
 710  * get_resource - find resource of given size and split up larger ones.
 711  * @head: the list to search for resources
 712  * @size: the size limit to use
 713  *
 714  * Description: This function sorts the resource list by size and then
 715  * returns the first node of "size" length.  If it finds a node
 716  * larger than "size" it will split it up.
 717  *
 718  * size must be a power of two.
 719  */
 720 static struct pci_resource *get_resource(struct pci_resource **head, u32 size)
 721 {
 722         struct pci_resource *prevnode;
 723         struct pci_resource *node;
 724         struct pci_resource *split_node;
 725         u32 temp_dword;
 726
 727         if (cpqhp_resource_sort_and_combine(head))
 728                 return NULL;
 729
 730         if (sort_by_size(head))
 731                 return NULL;
 732
 733         for (node = *head; node; node = node->next) {
 734                 dbg("%s: req_size =%x node=%p, base=%x, length=%x\n",
 735                     __func__, size, node, node->base, node->length);
 736                 if (node->length < size)
 737                         continue;
 738
 739                 if (node->base & (size - 1)) {
 740                         dbg("%s: not aligned\n", __func__);
 741                         /* this one isn't base aligned properly
 742                          * so we'll make a new entry and split it up
 743                          */
 744                         temp_dword = (node->base | (size-1)) + 1;
 745
 746                         /* Short circuit if adjusted size is too small */
 747                         if ((node->length - (temp_dword - node->base)) < size)
 748                                 continue;
 749
 750                         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 751
 752                         if (!split_node)
 753                                 return NULL;
 754
 755                         split_node->base = node->base;
 756                         split_node->length = temp_dword - node->base;
 757                         node->base = temp_dword;
 758                         node->length -= split_node->length;
 759
 760                         split_node->next = node->next;
 761                         node->next = split_node;
 762                 } /* End of non-aligned base */
 763
 764                 /* Don't need to check if too small since we already did */
 765                 if (node->length > size) {
 766                         dbg("%s: too big\n", __func__);
 767                         /* this one is longer than we need
 768                          * so we'll make a new entry and split it up
 769                          */
 770                         split_node = kmalloc(sizeof(*split_node), GFP_KERNEL);
 771
 772                         if (!split_node)
 773                                 return NULL;
 774
 775                         split_node->base = node->base + size;
 776                         split_node->length = node->length - size;
 777                         node->length = size;
 778
 779                         /* Put it in the list */
 780                         split_node->next = node->next;
 781                         node->next = split_node;
 782                 }  /* End of too big on top end */
 783
 784                 dbg("%s: got one!!!\n", __func__);
 785                 /* If we got here, then it is the right size
 786                  * Now take it out of the list */
 787                 if (*head == node) {
 788                         *head = node->next;
 789                 } else {
 790                         prevnode = *head;
 791                         while (prevnode->next != node)
 792                                 prevnode = prevnode->next;
 793
 794                         prevnode->next = node->next;
 795                 }
 796                 node->next = NULL;
 797                 break;
 798         }
 799         return node;
 800 }
 801
 802
 803 /**
 804  * cpqhp_resource_sort_and_combine - sort nodes by base addresses and clean up
 805  * @head: the list to sort and clean up
 806  *
 807  * Description: Sorts all of the nodes in the list in ascending order by
 808  * their base addresses.  Also does garbage collection by
 809  * combining adjacent nodes.
 810  *
 811  * Returns %0 if success.
 812  */
 813 int cpqhp_resource_sort_and_combine(struct pci_resource **head)
 814 {
 815         struct pci_resource *node1;
 816         struct pci_resource *node2;
 817         int out_of_order = 1;
 818
 819         dbg("%s: head = %p, *head = %p\n", __func__, head, *head);
 820
 821         if (!(*head))
 822                 return 1;
 823
 824         dbg("*head->next = %p\n", (*head)->next);
 825
 826         if (!(*head)->next)
 827                 return 0;       /* only one item on the list, already sorted! */
 828
 829         dbg("*head->base = 0x%x\n", (*head)->base);
 830         dbg("*head->next->base = 0x%x\n", (*head)->next->base);
 831         while (out_of_order) {
 832                 out_of_order = 0;
 833
 834                 /* Special case for swapping list head */
 835                 if (((*head)->next) &&
 836                     ((*head)->base > (*head)->next->base)) {
 837                         node1 = *head;
 838                         (*head) = (*head)->next;
 839                         node1->next = (*head)->next;
 840                         (*head)->next = node1;
 841                         out_of_order++;
 842                 }
 843
 844                 node1 = (*head);
 845
 846                 while (node1->next && node1->next->next) {
 847                         if (node1->next->base > node1->next->next->base) {
 848                                 out_of_order++;
 849                                 node2 = node1->next;
 850                                 node1->next = node1->next->next;
 851                                 node1 = node1->next;
 852                                 node2->next = node1->next;
 853                                 node1->next = node2;
 854                         } else
 855                                 node1 = node1->next;
 856                 }
 857         }  /* End of out_of_order loop */
 858
 859         node1 = *head;
 860
 861         while (node1 && node1->next) {
 862                 if ((node1->base + node1->length) == node1->next->base) {
 863                         /* Combine */
 864                         dbg("8..\n");
 865                         node1->length += node1->next->length;
 866                         node2 = node1->next;
 867                         node1->next = node1->next->next;
 868                         kfree(node2);
 869                 } else
 870                         node1 = node1->next;
 871         }
 872
 873         return 0;
 874 }
 875
 876
 877 irqreturn_t cpqhp_ctrl_intr(int IRQ, void *data)
 878 {
 879         struct controller *ctrl = data;
 880         u8 schedule_flag = 0;
 881         u8 reset;
 882         u16 misc;
 883         u32 Diff;
 884         u32 temp_dword;
 885
 886
 887         misc = readw(ctrl->hpc_reg + MISC);
 888         /*
 889          * Check to see if it was our interrupt
 890          */
 891         if (!(misc & 0x000C))
 892                 return IRQ_NONE;
 893
 894         if (misc & 0x0004) {
 895                 /*
 896                  * Serial Output interrupt Pending
 897                  */
 898
 899                 /* Clear the interrupt */
 900                 misc |= 0x0004;
 901                 writew(misc, ctrl->hpc_reg + MISC);
 902
 903                 /* Read to clear posted writes */
 904                 misc = readw(ctrl->hpc_reg + MISC);
 905
 906                 dbg("%s - waking up\n", __func__);
 907                 wake_up_interruptible(&ctrl->queue);
 908         }
 909
 910         if (misc & 0x0008) {
 911                 /* General-interrupt-input interrupt Pending */
 912                 Diff = readl(ctrl->hpc_reg + INT_INPUT_CLEAR) ^ ctrl->ctrl_int_comp;
 913
 914                 ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
 915
 916                 /* Clear the interrupt */
 917                 writel(Diff, ctrl->hpc_reg + INT_INPUT_CLEAR);
 918
 919                 /* Read it back to clear any posted writes */
 920                 temp_dword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
 921
 922                 if (!Diff)
 923                         /* Clear all interrupts */
 924                         writel(0xFFFFFFFF, ctrl->hpc_reg + INT_INPUT_CLEAR);
 925
 926                 schedule_flag += handle_switch_change((u8)(Diff & 0xFFL), ctrl);
 927                 schedule_flag += handle_presence_change((u16)((Diff & 0xFFFF0000L) >> 16), ctrl);
 928                 schedule_flag += handle_power_fault((u8)((Diff & 0xFF00L) >> 8), ctrl);
 929         }
 930
 931         reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
 932         if (reset & 0x40) {
 933                 /* Bus reset has completed */
 934                 reset &= 0xCF;
 935                 writeb(reset, ctrl->hpc_reg + RESET_FREQ_MODE);
 936                 reset = readb(ctrl->hpc_reg + RESET_FREQ_MODE);
 937                 wake_up_interruptible(&ctrl->queue);
 938         }
 939
 940         if (schedule_flag) {
 941                 wake_up_process(cpqhp_event_thread);
 942                 dbg("Waking even thread");
 943         }
 944         return IRQ_HANDLED;
 945 }
 946
 947
 948 /**
 949  * cpqhp_slot_create - Creates a node and adds it to the proper bus.
 950  * @busnumber: bus where new node is to be located
 951  *
 952  * Returns pointer to the new node or %NULL if unsuccessful.
 953  */
 954 struct pci_func *cpqhp_slot_create(u8 busnumber)
 955 {
 956         struct pci_func *new_slot;
 957         struct pci_func *next;
 958
 959         new_slot = kzalloc(sizeof(*new_slot), GFP_KERNEL);
 960         if (new_slot == NULL)
 961                 return new_slot;
 962
 963         new_slot->next = NULL;
 964         new_slot->configured = 1;
 965
 966         if (cpqhp_slot_list[busnumber] == NULL) {
 967                 cpqhp_slot_list[busnumber] = new_slot;
 968         } else {
 969                 next = cpqhp_slot_list[busnumber];
 970                 while (next->next != NULL)
 971                         next = next->next;
 972                 next->next = new_slot;
 973         }
 974         return new_slot;
 975 }
 976
 977
 978 /**
 979  * slot_remove - Removes a node from the linked list of slots.
 980  * @old_slot: slot to remove
 981  *
 982  * Returns %0 if successful, !0 otherwise.
 983  */
 984 static int slot_remove(struct pci_func *old_slot)
 985 {
 986         struct pci_func *next;
 987
 988         if (old_slot == NULL)
 989                 return 1;
 990
 991         next = cpqhp_slot_list[old_slot->bus];
 992         if (next == NULL)
 993                 return 1;
 994
 995         if (next == old_slot) {
 996                 cpqhp_slot_list[old_slot->bus] = old_slot->next;
 997                 cpqhp_destroy_board_resources(old_slot);
 998                 kfree(old_slot);
 999                 return 0;
1000         }
1001
1002         while ((next->next != old_slot) && (next->next != NULL))
1003                 next = next->next;
1004
1005         if (next->next == old_slot) {
1006                 next->next = old_slot->next;
1007                 cpqhp_destroy_board_resources(old_slot);
1008                 kfree(old_slot);
1009                 return 0;
1010         } else
1011                 return 2;
1012 }
1013
1014
1015 /**
1016  * bridge_slot_remove - Removes a node from the linked list of slots.
1017  * @bridge: bridge to remove
1018  *
1019  * Returns %0 if successful, !0 otherwise.
1020  */
1021 static int bridge_slot_remove(struct pci_func *bridge)
1022 {
1023         u8 subordinateBus, secondaryBus;
1024         u8 tempBus;
1025         struct pci_func *next;
1026
1027         secondaryBus = (bridge->config_space[0x06] >> 8) & 0xFF;
1028         subordinateBus = (bridge->config_space[0x06] >> 16) & 0xFF;
1029
1030         for (tempBus = secondaryBus; tempBus <= subordinateBus; tempBus++) {
1031                 next = cpqhp_slot_list[tempBus];
1032
1033                 while (!slot_remove(next))
1034                         next = cpqhp_slot_list[tempBus];
1035         }
1036
1037         next = cpqhp_slot_list[bridge->bus];
1038
1039         if (next == NULL)
1040                 return 1;
1041
1042         if (next == bridge) {
1043                 cpqhp_slot_list[bridge->bus] = bridge->next;
1044                 goto out;
1045         }
1046
1047         while ((next->next != bridge) && (next->next != NULL))
1048                 next = next->next;
1049
1050         if (next->next != bridge)
1051                 return 2;
1052         next->next = bridge->next;
1053 out:
1054         kfree(bridge);
1055         return 0;
1056 }
1057
1058
1059 /**
1060  * cpqhp_slot_find - Looks for a node by bus, and device, multiple functions accessed
1061  * @bus: bus to find
1062  * @device: device to find
1063  * @index: is %0 for first function found, %1 for the second...
1064  *
1065  * Returns pointer to the node if successful, %NULL otherwise.
1066  */
1067 struct pci_func *cpqhp_slot_find(u8 bus, u8 device, u8 index)
1068 {
1069         int found = -1;
1070         struct pci_func *func;
1071
1072         func = cpqhp_slot_list[bus];
1073
1074         if ((func == NULL) || ((func->device == device) && (index == 0)))
1075                 return func;
1076
1077         if (func->device == device)
1078                 found++;
1079
1080         while (func->next != NULL) {
1081                 func = func->next;
1082
1083                 if (func->device == device)
1084                         found++;
1085
1086                 if (found == index)
1087                         return func;
1088         }
1089
1090         return NULL;
1091 }
1092
1093
1094 /* DJZ: I don't think is_bridge will work as is.
1095  * FIXME */
1096 static int is_bridge(struct pci_func *func)
1097 {
1098         /* Check the header type */
1099         if (((func->config_space[0x03] >> 16) & 0xFF) == 0x01)
1100                 return 1;
1101         else
1102                 return 0;
1103 }
1104
1105
1106 /**
1107  * set_controller_speed - set the frequency and/or mode of a specific controller segment.
1108  * @ctrl: controller to change frequency/mode for.
1109  * @adapter_speed: the speed of the adapter we want to match.
1110  * @hp_slot: the slot number where the adapter is installed.
1111  *
1112  * Returns %0 if we successfully change frequency and/or mode to match the
1113  * adapter speed.
1114  */
1115 static u8 set_controller_speed(struct controller *ctrl, u8 adapter_speed, u8 hp_slot)
1116 {
1117         struct slot *slot;
1118         struct pci_bus *bus = ctrl->pci_bus;
1119         u8 reg;
1120         u8 slot_power = readb(ctrl->hpc_reg + SLOT_POWER);
1121         u16 reg16;
1122         u32 leds = readl(ctrl->hpc_reg + LED_CONTROL);
1123
1124         if (bus->cur_bus_speed == adapter_speed)
1125                 return 0;
1126
1127         /* We don't allow freq/mode changes if we find another adapter running
1128          * in another slot on this controller
1129          */
1130         for (slot = ctrl->slot; slot; slot = slot->next) {
1131                 if (slot->device == (hp_slot + ctrl->slot_device_offset))
1132                         continue;
1133                 if (!slot->hotplug_slot)
1134                         continue;
1135                 if (get_presence_status(ctrl, slot) == 0)
1136                         continue;
1137                 /* If another adapter is running on the same segment but at a
1138                  * lower speed/mode, we allow the new adapter to function at
1139                  * this rate if supported
1140                  */
1141                 if (bus->cur_bus_speed < adapter_speed)
1142                         return 0;
1143
1144                 return 1;
1145         }
1146
1147         /* If the controller doesn't support freq/mode changes and the
1148          * controller is running at a higher mode, we bail
1149          */
1150         if ((bus->cur_bus_speed > adapter_speed) && (!ctrl->pcix_speed_capability))
1151                 return 1;
1152
1153         /* But we allow the adapter to run at a lower rate if possible */
1154         if ((bus->cur_bus_speed < adapter_speed) && (!ctrl->pcix_speed_capability))
1155                 return 0;
1156
1157         /* We try to set the max speed supported by both the adapter and
1158          * controller
1159          */
1160         if (bus->max_bus_speed < adapter_speed) {
1161                 if (bus->cur_bus_speed == bus->max_bus_speed)
1162                         return 0;
1163                 adapter_speed = bus->max_bus_speed;
1164         }
1165
1166         writel(0x0L, ctrl->hpc_reg + LED_CONTROL);
1167         writeb(0x00, ctrl->hpc_reg + SLOT_ENABLE);
1168
1169         set_SOGO(ctrl);
1170         wait_for_ctrl_irq(ctrl);
1171
1172         if (adapter_speed != PCI_SPEED_133MHz_PCIX)
1173                 reg = 0xF5;
1174         else
1175                 reg = 0xF4;
1176         pci_write_config_byte(ctrl->pci_dev, 0x41, reg);
1177
1178         reg16 = readw(ctrl->hpc_reg + NEXT_CURR_FREQ);
1179         reg16 &= ~0x000F;
1180         switch (adapter_speed) {
1181                 case(PCI_SPEED_133MHz_PCIX):
1182                         reg = 0x75;
1183                         reg16 |= 0xB;
1184                         break;
1185                 case(PCI_SPEED_100MHz_PCIX):
1186                         reg = 0x74;
1187                         reg16 |= 0xA;
1188                         break;
1189                 case(PCI_SPEED_66MHz_PCIX):
1190                         reg = 0x73;
1191                         reg16 |= 0x9;
1192                         break;
1193                 case(PCI_SPEED_66MHz):
1194                         reg = 0x73;
1195                         reg16 |= 0x1;
1196                         break;
1197                 default: /* 33MHz PCI 2.2 */
1198                         reg = 0x71;
1199                         break;
1200
1201         }
1202         reg16 |= 0xB << 12;
1203         writew(reg16, ctrl->hpc_reg + NEXT_CURR_FREQ);
1204
1205         mdelay(5);
1206
1207         /* Reenable interrupts */
1208         writel(0, ctrl->hpc_reg + INT_MASK);
1209
1210         pci_write_config_byte(ctrl->pci_dev, 0x41, reg);
1211
1212         /* Restart state machine */
1213         reg = ~0xF;
1214         pci_read_config_byte(ctrl->pci_dev, 0x43, &reg);
1215         pci_write_config_byte(ctrl->pci_dev, 0x43, reg);
1216
1217         /* Only if mode change...*/
1218         if (((bus->cur_bus_speed == PCI_SPEED_66MHz) && (adapter_speed == PCI_SPEED_66MHz_PCIX)) ||
1219                 ((bus->cur_bus_speed == PCI_SPEED_66MHz_PCIX) && (adapter_speed == PCI_SPEED_66MHz)))
1220                         set_SOGO(ctrl);
1221
1222         wait_for_ctrl_irq(ctrl);
1223         mdelay(1100);
1224
1225         /* Restore LED/Slot state */
1226         writel(leds, ctrl->hpc_reg + LED_CONTROL);
1227         writeb(slot_power, ctrl->hpc_reg + SLOT_ENABLE);
1228
1229         set_SOGO(ctrl);
1230         wait_for_ctrl_irq(ctrl);
1231
1232         bus->cur_bus_speed = adapter_speed;
1233         slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
1234
1235         info("Successfully changed frequency/mode for adapter in slot %d\n",
1236                         slot->number);
1237         return 0;
1238 }
1239
1240 /* the following routines constitute the bulk of the
1241  * hotplug controller logic
1242  */
1243
1244
1245 /**
1246  * board_replaced - Called after a board has been replaced in the system.
1247  * @func: PCI device/function information
1248  * @ctrl: hotplug controller
1249  *
1250  * This is only used if we don't have resources for hot add.
1251  * Turns power on for the board.
1252  * Checks to see if board is the same.
1253  * If board is same, reconfigures it.
1254  * If board isn't same, turns it back off.
1255  */
1256 static u32 board_replaced(struct pci_func *func, struct controller *ctrl)
1257 {
1258         struct pci_bus *bus = ctrl->pci_bus;
1259         u8 hp_slot;
1260         u8 temp_byte;
1261         u8 adapter_speed;
1262         u32 rc = 0;
1263
1264         hp_slot = func->device - ctrl->slot_device_offset;
1265
1266         /*
1267          * The switch is open.
1268          */
1269         if (readl(ctrl->hpc_reg + INT_INPUT_CLEAR) & (0x01L << hp_slot))
1270                 rc = INTERLOCK_OPEN;
1271         /*
1272          * The board is already on
1273          */
1274         else if (is_slot_enabled(ctrl, hp_slot))
1275                 rc = CARD_FUNCTIONING;
1276         else {
1277                 mutex_lock(&ctrl->crit_sect);
1278
1279                 /* turn on board without attaching to the bus */
1280                 enable_slot_power(ctrl, hp_slot);
1281
1282                 set_SOGO(ctrl);
1283
1284                 /* Wait for SOBS to be unset */
1285                 wait_for_ctrl_irq(ctrl);
1286
1287                 /* Change bits in slot power register to force another shift out
1288                  * NOTE: this is to work around the timer bug */
1289                 temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
1290                 writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
1291                 writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);
1292
1293                 set_SOGO(ctrl);
1294
1295                 /* Wait for SOBS to be unset */
1296                 wait_for_ctrl_irq(ctrl);
1297
1298                 adapter_speed = get_adapter_speed(ctrl, hp_slot);
1299                 if (bus->cur_bus_speed != adapter_speed)
1300                         if (set_controller_speed(ctrl, adapter_speed, hp_slot))
1301                                 rc = WRONG_BUS_FREQUENCY;
1302
1303                 /* turn off board without attaching to the bus */
1304                 disable_slot_power(ctrl, hp_slot);
1305
1306                 set_SOGO(ctrl);
1307
1308                 /* Wait for SOBS to be unset */
1309                 wait_for_ctrl_irq(ctrl);
1310
1311                 mutex_unlock(&ctrl->crit_sect);
1312
1313                 if (rc)
1314                         return rc;
1315
1316                 mutex_lock(&ctrl->crit_sect);
1317
1318                 slot_enable(ctrl, hp_slot);
1319                 green_LED_blink(ctrl, hp_slot);
1320
1321                 amber_LED_off(ctrl, hp_slot);
1322
1323                 set_SOGO(ctrl);
1324
1325                 /* Wait for SOBS to be unset */
1326                 wait_for_ctrl_irq(ctrl);
1327
1328                 mutex_unlock(&ctrl->crit_sect);
1329
1330                 /* Wait for ~1 second because of hot plug spec */
1331                 long_delay(1*HZ);
1332
1333                 /* Check for a power fault */
1334                 if (func->status == 0xFF) {
1335                         /* power fault occurred, but it was benign */
1336                         rc = POWER_FAILURE;
1337                         func->status = 0;
1338                 } else
1339                         rc = cpqhp_valid_replace(ctrl, func);
1340
1341                 if (!rc) {
1342                         /* It must be the same board */
1343
1344                         rc = cpqhp_configure_board(ctrl, func);
1345
1346                         /* If configuration fails, turn it off
1347                          * Get slot won't work for devices behind
1348                          * bridges, but in this case it will always be
1349                          * called for the "base" bus/dev/func of an
1350                          * adapter.
1351                          */
1352
1353                         mutex_lock(&ctrl->crit_sect);
1354
1355                         amber_LED_on(ctrl, hp_slot);
1356                         green_LED_off(ctrl, hp_slot);
1357                         slot_disable(ctrl, hp_slot);
1358
1359                         set_SOGO(ctrl);
1360
1361                         /* Wait for SOBS to be unset */
1362                         wait_for_ctrl_irq(ctrl);
1363
1364                         mutex_unlock(&ctrl->crit_sect);
1365
1366                         if (rc)
1367                                 return rc;
1368                         else
1369                                 return 1;
1370
1371                 } else {
1372                         /* Something is wrong
1373
1374                          * Get slot won't work for devices behind bridges, but
1375                          * in this case it will always be called for the "base"
1376                          * bus/dev/func of an adapter.
1377                          */
1378
1379                         mutex_lock(&ctrl->crit_sect);
1380
1381                         amber_LED_on(ctrl, hp_slot);
1382                         green_LED_off(ctrl, hp_slot);
1383                         slot_disable(ctrl, hp_slot);
1384
1385                         set_SOGO(ctrl);
1386
1387                         /* Wait for SOBS to be unset */
1388                         wait_for_ctrl_irq(ctrl);
1389
1390                         mutex_unlock(&ctrl->crit_sect);
1391                 }
1392
1393         }
1394         return rc;
1395
1396 }
1397
1398
1399 /**
1400  * board_added - Called after a board has been added to the system.
1401  * @func: PCI device/function info
1402  * @ctrl: hotplug controller
1403  *
1404  * Turns power on for the board.
1405  * Configures board.
1406  */
1407 static u32 board_added(struct pci_func *func, struct controller *ctrl)
1408 {
1409         u8 hp_slot;
1410         u8 temp_byte;
1411         u8 adapter_speed;
1412         int index;
1413         u32 temp_register = 0xFFFFFFFF;
1414         u32 rc = 0;
1415         struct pci_func *new_slot = NULL;
1416         struct pci_bus *bus = ctrl->pci_bus;
1417         struct slot *p_slot;
1418         struct resource_lists res_lists;
1419
1420         hp_slot = func->device - ctrl->slot_device_offset;
1421         dbg("%s: func->device, slot_offset, hp_slot = %d, %d ,%d\n",
1422             __func__, func->device, ctrl->slot_device_offset, hp_slot);
1423
1424         mutex_lock(&ctrl->crit_sect);
1425
1426         /* turn on board without attaching to the bus */
1427         enable_slot_power(ctrl, hp_slot);
1428
1429         set_SOGO(ctrl);
1430
1431         /* Wait for SOBS to be unset */
1432         wait_for_ctrl_irq(ctrl);
1433
1434         /* Change bits in slot power register to force another shift out
1435          * NOTE: this is to work around the timer bug
1436          */
1437         temp_byte = readb(ctrl->hpc_reg + SLOT_POWER);
1438         writeb(0x00, ctrl->hpc_reg + SLOT_POWER);
1439         writeb(temp_byte, ctrl->hpc_reg + SLOT_POWER);
1440
1441         set_SOGO(ctrl);
1442
1443         /* Wait for SOBS to be unset */
1444         wait_for_ctrl_irq(ctrl);
1445
1446         adapter_speed = get_adapter_speed(ctrl, hp_slot);
1447         if (bus->cur_bus_speed != adapter_speed)
1448                 if (set_controller_speed(ctrl, adapter_speed, hp_slot))
1449                         rc = WRONG_BUS_FREQUENCY;
1450
1451         /* turn off board without attaching to the bus */
1452         disable_slot_power(ctrl, hp_slot);
1453
1454         set_SOGO(ctrl);
1455
1456         /* Wait for SOBS to be unset */
1457         wait_for_ctrl_irq(ctrl);
1458
1459         mutex_unlock(&ctrl->crit_sect);
1460
1461         if (rc)
1462                 return rc;
1463
1464         p_slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
1465
1466         /* turn on board and blink green LED */
1467
1468         dbg("%s: before down\n", __func__);
1469         mutex_lock(&ctrl->crit_sect);
1470         dbg("%s: after down\n", __func__);
1471
1472         dbg("%s: before slot_enable\n", __func__);
1473         slot_enable(ctrl, hp_slot);
1474
1475         dbg("%s: before green_LED_blink\n", __func__);
1476         green_LED_blink(ctrl, hp_slot);
1477
1478         dbg("%s: before amber_LED_blink\n", __func__);
1479         amber_LED_off(ctrl, hp_slot);
1480
1481         dbg("%s: before set_SOGO\n", __func__);
1482         set_SOGO(ctrl);
1483
1484         /* Wait for SOBS to be unset */
1485         dbg("%s: before wait_for_ctrl_irq\n", __func__);
1486         wait_for_ctrl_irq(ctrl);
1487         dbg("%s: after wait_for_ctrl_irq\n", __func__);
1488
1489         dbg("%s: before up\n", __func__);
1490         mutex_unlock(&ctrl->crit_sect);
1491         dbg("%s: after up\n", __func__);
1492
1493         /* Wait for ~1 second because of hot plug spec */
1494         dbg("%s: before long_delay\n", __func__);
1495         long_delay(1*HZ);
1496         dbg("%s: after long_delay\n", __func__);
1497
1498         dbg("%s: func status = %x\n", __func__, func->status);
1499         /* Check for a power fault */
1500         if (func->status == 0xFF) {
1501                 /* power fault occurred, but it was benign */
1502                 temp_register = 0xFFFFFFFF;
1503                 dbg("%s: temp register set to %x by power fault\n", __func__, temp_register);
1504                 rc = POWER_FAILURE;
1505                 func->status = 0;
1506         } else {
1507                 /* Get vendor/device ID u32 */
1508                 ctrl->pci_bus->number = func->bus;
1509                 rc = pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, func->function), PCI_VENDOR_ID, &temp_register);
1510                 dbg("%s: pci_read_config_dword returns %d\n", __func__, rc);
1511                 dbg("%s: temp_register is %x\n", __func__, temp_register);
1512
1513                 if (rc != 0) {
1514                         /* Something's wrong here */
1515                         temp_register = 0xFFFFFFFF;
1516                         dbg("%s: temp register set to %x by error\n", __func__, temp_register);
1517                 }
1518                 /* Preset return code.  It will be changed later if things go okay. */
1519                 rc = NO_ADAPTER_PRESENT;
1520         }
1521
1522         /* All F's is an empty slot or an invalid board */
1523         if (temp_register != 0xFFFFFFFF) {
1524                 res_lists.io_head = ctrl->io_head;
1525                 res_lists.mem_head = ctrl->mem_head;
1526                 res_lists.p_mem_head = ctrl->p_mem_head;
1527                 res_lists.bus_head = ctrl->bus_head;
1528                 res_lists.irqs = NULL;
1529
1530                 rc = configure_new_device(ctrl, func, 0, &res_lists);
1531
1532                 dbg("%s: back from configure_new_device\n", __func__);
1533                 ctrl->io_head = res_lists.io_head;
1534                 ctrl->mem_head = res_lists.mem_head;
1535                 ctrl->p_mem_head = res_lists.p_mem_head;
1536                 ctrl->bus_head = res_lists.bus_head;
1537
1538                 cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
1539                 cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
1540                 cpqhp_resource_sort_and_combine(&(ctrl->io_head));
1541                 cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
1542
1543                 if (rc) {
1544                         mutex_lock(&ctrl->crit_sect);
1545
1546                         amber_LED_on(ctrl, hp_slot);
1547                         green_LED_off(ctrl, hp_slot);
1548                         slot_disable(ctrl, hp_slot);
1549
1550                         set_SOGO(ctrl);
1551
1552                         /* Wait for SOBS to be unset */
1553                         wait_for_ctrl_irq(ctrl);
1554
1555                         mutex_unlock(&ctrl->crit_sect);
1556                         return rc;
1557                 } else {
1558                         cpqhp_save_slot_config(ctrl, func);
1559                 }
1560
1561
1562                 func->status = 0;
1563                 func->switch_save = 0x10;
1564                 func->is_a_board = 0x01;
1565
1566                 /* next, we will instantiate the linux pci_dev structures (with
1567                  * appropriate driver notification, if already present) */
1568                 dbg("%s: configure linux pci_dev structure\n", __func__);
1569                 index = 0;
1570                 do {
1571                         new_slot = cpqhp_slot_find(ctrl->bus, func->device, index++);
1572                         if (new_slot && !new_slot->pci_dev)
1573                                 cpqhp_configure_device(ctrl, new_slot);
1574                 } while (new_slot);
1575
1576                 mutex_lock(&ctrl->crit_sect);
1577
1578                 green_LED_on(ctrl, hp_slot);
1579
1580                 set_SOGO(ctrl);
1581
1582                 /* Wait for SOBS to be unset */
1583                 wait_for_ctrl_irq(ctrl);
1584
1585                 mutex_unlock(&ctrl->crit_sect);
1586         } else {
1587                 mutex_lock(&ctrl->crit_sect);
1588
1589                 amber_LED_on(ctrl, hp_slot);
1590                 green_LED_off(ctrl, hp_slot);
1591                 slot_disable(ctrl, hp_slot);
1592
1593                 set_SOGO(ctrl);
1594
1595                 /* Wait for SOBS to be unset */
1596                 wait_for_ctrl_irq(ctrl);
1597
1598                 mutex_unlock(&ctrl->crit_sect);
1599
1600                 return rc;
1601         }
1602         return 0;
1603 }
1604
1605
1606 /**
1607  * remove_board - Turns off slot and LEDs
1608  * @func: PCI device/function info
1609  * @replace_flag: whether replacing or adding a new device
1610  * @ctrl: target controller
1611  */
1612 static u32 remove_board(struct pci_func *func, u32 replace_flag, struct controller *ctrl)
1613 {
1614         int index;
1615         u8 skip = 0;
1616         u8 device;
1617         u8 hp_slot;
1618         u8 temp_byte;
1619         u32 rc;
1620         struct resource_lists res_lists;
1621         struct pci_func *temp_func;
1622
1623         if (cpqhp_unconfigure_device(func))
1624                 return 1;
1625
1626         device = func->device;
1627
1628         hp_slot = func->device - ctrl->slot_device_offset;
1629         dbg("In %s, hp_slot = %d\n", __func__, hp_slot);
1630
1631         /* When we get here, it is safe to change base address registers.
1632          * We will attempt to save the base address register lengths */
1633         if (replace_flag || !ctrl->add_support)
1634                 rc = cpqhp_save_base_addr_length(ctrl, func);
1635         else if (!func->bus_head && !func->mem_head &&
1636                  !func->p_mem_head && !func->io_head) {
1637                 /* Here we check to see if we've saved any of the board's
1638                  * resources already.  If so, we'll skip the attempt to
1639                  * determine what's being used. */
1640                 index = 0;
1641                 temp_func = cpqhp_slot_find(func->bus, func->device, index++);
1642                 while (temp_func) {
1643                         if (temp_func->bus_head || temp_func->mem_head
1644                             || temp_func->p_mem_head || temp_func->io_head) {
1645                                 skip = 1;
1646                                 break;
1647                         }
1648                         temp_func = cpqhp_slot_find(temp_func->bus, temp_func->device, index++);
1649                 }
1650
1651                 if (!skip)
1652                         rc = cpqhp_save_used_resources(ctrl, func);
1653         }
1654         /* Change status to shutdown */
1655         if (func->is_a_board)
1656                 func->status = 0x01;
1657         func->configured = 0;
1658
1659         mutex_lock(&ctrl->crit_sect);
1660
1661         green_LED_off(ctrl, hp_slot);
1662         slot_disable(ctrl, hp_slot);
1663
1664         set_SOGO(ctrl);
1665
1666         /* turn off SERR for slot */
1667         temp_byte = readb(ctrl->hpc_reg + SLOT_SERR);
1668         temp_byte &= ~(0x01 << hp_slot);
1669         writeb(temp_byte, ctrl->hpc_reg + SLOT_SERR);
1670
1671         /* Wait for SOBS to be unset */
1672         wait_for_ctrl_irq(ctrl);
1673
1674         mutex_unlock(&ctrl->crit_sect);
1675
1676         if (!replace_flag && ctrl->add_support) {
1677                 while (func) {
1678                         res_lists.io_head = ctrl->io_head;
1679                         res_lists.mem_head = ctrl->mem_head;
1680                         res_lists.p_mem_head = ctrl->p_mem_head;
1681                         res_lists.bus_head = ctrl->bus_head;
1682
1683                         cpqhp_return_board_resources(func, &res_lists);
1684
1685                         ctrl->io_head = res_lists.io_head;
1686                         ctrl->mem_head = res_lists.mem_head;
1687                         ctrl->p_mem_head = res_lists.p_mem_head;
1688                         ctrl->bus_head = res_lists.bus_head;
1689
1690                         cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
1691                         cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
1692                         cpqhp_resource_sort_and_combine(&(ctrl->io_head));
1693                         cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
1694
1695                         if (is_bridge(func)) {
1696                                 bridge_slot_remove(func);
1697                         } else
1698                                 slot_remove(func);
1699
1700                         func = cpqhp_slot_find(ctrl->bus, device, 0);
1701                 }
1702
1703                 /* Setup slot structure with entry for empty slot */
1704                 func = cpqhp_slot_create(ctrl->bus);
1705
1706                 if (func == NULL)
1707                         return 1;
1708
1709                 func->bus = ctrl->bus;
1710                 func->device = device;
1711                 func->function = 0;
1712                 func->configured = 0;
1713                 func->switch_save = 0x10;
1714                 func->is_a_board = 0;
1715                 func->p_task_event = NULL;
1716         }
1717
1718         return 0;
1719 }
1720
1721 static void pushbutton_helper_thread(struct timer_list *t)
1722 {
1723         pushbutton_pending = t;
1724
1725         wake_up_process(cpqhp_event_thread);
1726 }
1727
1728
1729 /* this is the main worker thread */
1730 static int event_thread(void *data)
1731 {
1732         struct controller *ctrl;
1733
1734         while (1) {
1735                 dbg("!!!!event_thread sleeping\n");
1736                 set_current_state(TASK_INTERRUPTIBLE);
1737                 schedule();
1738
1739                 if (kthread_should_stop())
1740                         break;
1741                 /* Do stuff here */
1742                 if (pushbutton_pending)
1743                         cpqhp_pushbutton_thread(pushbutton_pending);
1744                 else
1745                         for (ctrl = cpqhp_ctrl_list; ctrl; ctrl = ctrl->next)
1746                                 interrupt_event_handler(ctrl);
1747         }
1748         dbg("event_thread signals exit\n");
1749         return 0;
1750 }
1751
1752 int cpqhp_event_start_thread(void)
1753 {
1754         cpqhp_event_thread = kthread_run(event_thread, NULL, "phpd_event");
1755         if (IS_ERR(cpqhp_event_thread)) {
1756                 err("Can't start up our event thread\n");
1757                 return PTR_ERR(cpqhp_event_thread);
1758         }
1759
1760         return 0;
1761 }
1762
1763
1764 void cpqhp_event_stop_thread(void)
1765 {
1766         kthread_stop(cpqhp_event_thread);
1767 }
1768
1769
1770 static void interrupt_event_handler(struct controller *ctrl)
1771 {
1772         int loop = 0;
1773         int change = 1;
1774         struct pci_func *func;
1775         u8 hp_slot;
1776         struct slot *p_slot;
1777
1778         while (change) {
1779                 change = 0;
1780
1781                 for (loop = 0; loop < 10; loop++) {
1782                         /* dbg("loop %d\n", loop); */
1783                         if (ctrl->event_queue[loop].event_type != 0) {
1784                                 hp_slot = ctrl->event_queue[loop].hp_slot;
1785
1786                                 func = cpqhp_slot_find(ctrl->bus, (hp_slot + ctrl->slot_device_offset), 0);
1787                                 if (!func)
1788                                         return;
1789
1790                                 p_slot = cpqhp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
1791                                 if (!p_slot)
1792                                         return;
1793
1794                                 dbg("hp_slot %d, func %p, p_slot %p\n",
1795                                     hp_slot, func, p_slot);
1796
1797                                 if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
1798                                         dbg("button pressed\n");
1799                                 } else if (ctrl->event_queue[loop].event_type ==
1800                                            INT_BUTTON_CANCEL) {
1801                                         dbg("button cancel\n");
1802                                         del_timer(&p_slot->task_event);
1803
1804                                         mutex_lock(&ctrl->crit_sect);
1805
1806                                         if (p_slot->state == BLINKINGOFF_STATE) {
1807                                                 /* slot is on */
1808                                                 dbg("turn on green LED\n");
1809                                                 green_LED_on(ctrl, hp_slot);
1810                                         } else if (p_slot->state == BLINKINGON_STATE) {
1811                                                 /* slot is off */
1812                                                 dbg("turn off green LED\n");
1813                                                 green_LED_off(ctrl, hp_slot);
1814                                         }
1815
1816                                         info(msg_button_cancel, p_slot->number);
1817
1818                                         p_slot->state = STATIC_STATE;
1819
1820                                         amber_LED_off(ctrl, hp_slot);
1821
1822                                         set_SOGO(ctrl);
1823
1824                                         /* Wait for SOBS to be unset */
1825                                         wait_for_ctrl_irq(ctrl);
1826
1827                                         mutex_unlock(&ctrl->crit_sect);
1828                                 }
1829                                 /*** button Released (No action on press...) */
1830                                 else if (ctrl->event_queue[loop].event_type == INT_BUTTON_RELEASE) {
1831                                         dbg("button release\n");
1832
1833                                         if (is_slot_enabled(ctrl, hp_slot)) {
1834                                                 dbg("slot is on\n");
1835                                                 p_slot->state = BLINKINGOFF_STATE;
1836                                                 info(msg_button_off, p_slot->number);
1837                                         } else {
1838                                                 dbg("slot is off\n");
1839                                                 p_slot->state = BLINKINGON_STATE;
1840                                                 info(msg_button_on, p_slot->number);
1841                                         }
1842                                         mutex_lock(&ctrl->crit_sect);
1843
1844                                         dbg("blink green LED and turn off amber\n");
1845
1846                                         amber_LED_off(ctrl, hp_slot);
1847                                         green_LED_blink(ctrl, hp_slot);
1848
1849                                         set_SOGO(ctrl);
1850
1851                                         /* Wait for SOBS to be unset */
1852                                         wait_for_ctrl_irq(ctrl);
1853
1854                                         mutex_unlock(&ctrl->crit_sect);
1855                                         timer_setup(&p_slot->task_event,
1856                                                     pushbutton_helper_thread,
1857                                                     0);
1858                                         p_slot->hp_slot = hp_slot;
1859                                         p_slot->ctrl = ctrl;
1860 /*                                      p_slot->physical_slot = physical_slot; */
1861                                         p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
1862
1863                                         dbg("add_timer p_slot = %p\n", p_slot);
1864                                         add_timer(&p_slot->task_event);
1865                                 }
1866                                 /***********POWER FAULT */
1867                                 else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
1868                                         dbg("power fault\n");
1869                                 }
1870
1871                                 ctrl->event_queue[loop].event_type = 0;
1872
1873                                 change = 1;
1874                         }
1875                 }               /* End of FOR loop */
1876         }
1877
1878         return;
1879 }
1880
1881
1882 /**
1883  * cpqhp_pushbutton_thread - handle pushbutton events
1884  * @slot: target slot (struct)
1885  *
1886  * Scheduled procedure to handle blocking stuff for the pushbuttons.
1887  * Handles all pending events and exits.
1888  */
1889 void cpqhp_pushbutton_thread(struct timer_list *t)
1890 {
1891         u8 hp_slot;
1892         u8 device;
1893         struct pci_func *func;
1894         struct slot *p_slot = from_timer(p_slot, t, task_event);
1895         struct controller *ctrl = (struct controller *) p_slot->ctrl;
1896
1897         pushbutton_pending = NULL;
1898         hp_slot = p_slot->hp_slot;
1899
1900         device = p_slot->device;
1901
1902         if (is_slot_enabled(ctrl, hp_slot)) {
1903                 p_slot->state = POWEROFF_STATE;
1904                 /* power Down board */
1905                 func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
1906                 dbg("In power_down_board, func = %p, ctrl = %p\n", func, ctrl);
1907                 if (!func) {
1908                         dbg("Error! func NULL in %s\n", __func__);
1909                         return;
1910                 }
1911
1912                 if (cpqhp_process_SS(ctrl, func) != 0) {
1913                         amber_LED_on(ctrl, hp_slot);
1914                         green_LED_on(ctrl, hp_slot);
1915
1916                         set_SOGO(ctrl);
1917
1918                         /* Wait for SOBS to be unset */
1919                         wait_for_ctrl_irq(ctrl);
1920                 }
1921
1922                 p_slot->state = STATIC_STATE;
1923         } else {
1924                 p_slot->state = POWERON_STATE;
1925                 /* slot is off */
1926
1927                 func = cpqhp_slot_find(p_slot->bus, p_slot->device, 0);
1928                 dbg("In add_board, func = %p, ctrl = %p\n", func, ctrl);
1929                 if (!func) {
1930                         dbg("Error! func NULL in %s\n", __func__);
1931                         return;
1932                 }
1933
1934                 if (ctrl != NULL) {
1935                         if (cpqhp_process_SI(ctrl, func) != 0) {
1936                                 amber_LED_on(ctrl, hp_slot);
1937                                 green_LED_off(ctrl, hp_slot);
1938
1939                                 set_SOGO(ctrl);
1940
1941                                 /* Wait for SOBS to be unset */
1942                                 wait_for_ctrl_irq(ctrl);
1943                         }
1944                 }
1945
1946                 p_slot->state = STATIC_STATE;
1947         }
1948
1949         return;
1950 }
1951
1952
1953 int cpqhp_process_SI(struct controller *ctrl, struct pci_func *func)
1954 {
1955         u8 device, hp_slot;
1956         u16 temp_word;
1957         u32 tempdword;
1958         int rc;
1959         struct slot *p_slot;
1960         int physical_slot = 0;
1961
1962         tempdword = 0;
1963
1964         device = func->device;
1965         hp_slot = device - ctrl->slot_device_offset;
1966         p_slot = cpqhp_find_slot(ctrl, device);
1967         if (p_slot)
1968                 physical_slot = p_slot->number;
1969
1970         /* Check to see if the interlock is closed */
1971         tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
1972
1973         if (tempdword & (0x01 << hp_slot))
1974                 return 1;
1975
1976         if (func->is_a_board) {
1977                 rc = board_replaced(func, ctrl);
1978         } else {
1979                 /* add board */
1980                 slot_remove(func);
1981
1982                 func = cpqhp_slot_create(ctrl->bus);
1983                 if (func == NULL)
1984                         return 1;
1985
1986                 func->bus = ctrl->bus;
1987                 func->device = device;
1988                 func->function = 0;
1989                 func->configured = 0;
1990                 func->is_a_board = 1;
1991
1992                 /* We have to save the presence info for these slots */
1993                 temp_word = ctrl->ctrl_int_comp >> 16;
1994                 func->presence_save = (temp_word >> hp_slot) & 0x01;
1995                 func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
1996
1997                 if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
1998                         func->switch_save = 0;
1999                 } else {
2000                         func->switch_save = 0x10;
2001                 }
2002
2003                 rc = board_added(func, ctrl);
2004                 if (rc) {
2005                         if (is_bridge(func)) {
2006                                 bridge_slot_remove(func);
2007                         } else
2008                                 slot_remove(func);
2009
2010                         /* Setup slot structure with entry for empty slot */
2011                         func = cpqhp_slot_create(ctrl->bus);
2012
2013                         if (func == NULL)
2014                                 return 1;
2015
2016                         func->bus = ctrl->bus;
2017                         func->device = device;
2018                         func->function = 0;
2019                         func->configured = 0;
2020                         func->is_a_board = 0;
2021
2022                         /* We have to save the presence info for these slots */
2023                         temp_word = ctrl->ctrl_int_comp >> 16;
2024                         func->presence_save = (temp_word >> hp_slot) & 0x01;
2025                         func->presence_save |=
2026                         (temp_word >> (hp_slot + 7)) & 0x02;
2027
2028                         if (ctrl->ctrl_int_comp & (0x1L << hp_slot)) {
2029                                 func->switch_save = 0;
2030                         } else {
2031                                 func->switch_save = 0x10;
2032                         }
2033                 }
2034         }
2035
2036         if (rc)
2037                 dbg("%s: rc = %d\n", __func__, rc);
2038
2039         return rc;
2040 }
2041
2042
2043 int cpqhp_process_SS(struct controller *ctrl, struct pci_func *func)
2044 {
2045         u8 device, class_code, header_type, BCR;
2046         u8 index = 0;
2047         u8 replace_flag;
2048         u32 rc = 0;
2049         unsigned int devfn;
2050         struct slot *p_slot;
2051         struct pci_bus *pci_bus = ctrl->pci_bus;
2052         int physical_slot = 0;
2053
2054         device = func->device;
2055         func = cpqhp_slot_find(ctrl->bus, device, index++);
2056         p_slot = cpqhp_find_slot(ctrl, device);
2057         if (p_slot)
2058                 physical_slot = p_slot->number;
2059
2060         /* Make sure there are no video controllers here */
2061         while (func && !rc) {
2062                 pci_bus->number = func->bus;
2063                 devfn = PCI_DEVFN(func->device, func->function);
2064
2065                 /* Check the Class Code */
2066                 rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
2067                 if (rc)
2068                         return rc;
2069
2070                 if (class_code == PCI_BASE_CLASS_DISPLAY) {
2071                         /* Display/Video adapter (not supported) */
2072                         rc = REMOVE_NOT_SUPPORTED;
2073                 } else {
2074                         /* See if it's a bridge */
2075                         rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
2076                         if (rc)
2077                                 return rc;
2078
2079                         /* If it's a bridge, check the VGA Enable bit */
2080                         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
2081                                 rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
2082                                 if (rc)
2083                                         return rc;
2084
2085                                 /* If the VGA Enable bit is set, remove isn't
2086                                  * supported */
2087                                 if (BCR & PCI_BRIDGE_CTL_VGA)
2088                                         rc = REMOVE_NOT_SUPPORTED;
2089                         }
2090                 }
2091
2092                 func = cpqhp_slot_find(ctrl->bus, device, index++);
2093         }
2094
2095         func = cpqhp_slot_find(ctrl->bus, device, 0);
2096         if ((func != NULL) && !rc) {
2097                 /* FIXME: Replace flag should be passed into process_SS */
2098                 replace_flag = !(ctrl->add_support);
2099                 rc = remove_board(func, replace_flag, ctrl);
2100         } else if (!rc) {
2101                 rc = 1;
2102         }
2103
2104         return rc;
2105 }
2106
2107 /**
2108  * switch_leds - switch the leds, go from one site to the other.
2109  * @ctrl: controller to use
2110  * @num_of_slots: number of slots to use
2111  * @work_LED: LED control value
2112  * @direction: 1 to start from the left side, 0 to start right.
2113  */
2114 static void switch_leds(struct controller *ctrl, const int num_of_slots,
2115                         u32 *work_LED, const int direction)
2116 {
2117         int loop;
2118
2119         for (loop = 0; loop < num_of_slots; loop++) {
2120                 if (direction)
2121                         *work_LED = *work_LED >> 1;
2122                 else
2123                         *work_LED = *work_LED << 1;
2124                 writel(*work_LED, ctrl->hpc_reg + LED_CONTROL);
2125
2126                 set_SOGO(ctrl);
2127
2128                 /* Wait for SOGO interrupt */
2129                 wait_for_ctrl_irq(ctrl);
2130
2131                 /* Get ready for next iteration */
2132                 long_delay((2*HZ)/10);
2133         }
2134 }
2135
2136 /**
2137  * cpqhp_hardware_test - runs hardware tests
2138  * @ctrl: target controller
2139  * @test_num: the number written to the "test" file in sysfs.
2140  *
2141  * For hot plug ctrl folks to play with.
2142  */
2143 int cpqhp_hardware_test(struct controller *ctrl, int test_num)
2144 {
2145         u32 save_LED;
2146         u32 work_LED;
2147         int loop;
2148         int num_of_slots;
2149
2150         num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0f;
2151
2152         switch (test_num) {
2153         case 1:
2154                 /* Do stuff here! */
2155
2156                 /* Do that funky LED thing */
2157                 /* so we can restore them later */
2158                 save_LED = readl(ctrl->hpc_reg + LED_CONTROL);
2159                 work_LED = 0x01010101;
2160                 switch_leds(ctrl, num_of_slots, &work_LED, 0);
2161                 switch_leds(ctrl, num_of_slots, &work_LED, 1);
2162                 switch_leds(ctrl, num_of_slots, &work_LED, 0);
2163                 switch_leds(ctrl, num_of_slots, &work_LED, 1);
2164
2165                 work_LED = 0x01010000;
2166                 writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
2167                 switch_leds(ctrl, num_of_slots, &work_LED, 0);
2168                 switch_leds(ctrl, num_of_slots, &work_LED, 1);
2169                 work_LED = 0x00000101;
2170                 writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
2171                 switch_leds(ctrl, num_of_slots, &work_LED, 0);
2172                 switch_leds(ctrl, num_of_slots, &work_LED, 1);
2173
2174                 work_LED = 0x01010000;
2175                 writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
2176                 for (loop = 0; loop < num_of_slots; loop++) {
2177                         set_SOGO(ctrl);
2178
2179                         /* Wait for SOGO interrupt */
2180                         wait_for_ctrl_irq(ctrl);
2181
2182                         /* Get ready for next iteration */
2183                         long_delay((3*HZ)/10);
2184                         work_LED = work_LED >> 16;
2185                         writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
2186
2187                         set_SOGO(ctrl);
2188
2189                         /* Wait for SOGO interrupt */
2190                         wait_for_ctrl_irq(ctrl);
2191
2192                         /* Get ready for next iteration */
2193                         long_delay((3*HZ)/10);
2194                         work_LED = work_LED << 16;
2195                         writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
2196                         work_LED = work_LED << 1;
2197                         writel(work_LED, ctrl->hpc_reg + LED_CONTROL);
2198                 }
2199
2200                 /* put it back the way it was */
2201                 writel(save_LED, ctrl->hpc_reg + LED_CONTROL);
2202
2203                 set_SOGO(ctrl);
2204
2205                 /* Wait for SOBS to be unset */
2206                 wait_for_ctrl_irq(ctrl);
2207                 break;
2208         case 2:
2209                 /* Do other stuff here! */
2210                 break;
2211         case 3:
2212                 /* and more... */
2213                 break;
2214         }
2215         return 0;
2216 }
2217
2218
2219 /**
2220  * configure_new_device - Configures the PCI header information of one board.
2221  * @ctrl: pointer to controller structure
2222  * @func: pointer to function structure
2223  * @behind_bridge: 1 if this is a recursive call, 0 if not
2224  * @resources: pointer to set of resource lists
2225  *
2226  * Returns 0 if success.
2227  */
2228 static u32 configure_new_device(struct controller  *ctrl, struct pci_func  *func,
2229                                  u8 behind_bridge, struct resource_lists  *resources)
2230 {
2231         u8 temp_byte, function, max_functions, stop_it;
2232         int rc;
2233         u32 ID;
2234         struct pci_func *new_slot;
2235         int index;
2236
2237         new_slot = func;
2238
2239         dbg("%s\n", __func__);
2240         /* Check for Multi-function device */
2241         ctrl->pci_bus->number = func->bus;
2242         rc = pci_bus_read_config_byte(ctrl->pci_bus, PCI_DEVFN(func->device, func->function), 0x0E, &temp_byte);
2243         if (rc) {
2244                 dbg("%s: rc = %d\n", __func__, rc);
2245                 return rc;
2246         }
2247
2248         if (temp_byte & 0x80)   /* Multi-function device */
2249                 max_functions = 8;
2250         else
2251                 max_functions = 1;
2252
2253         function = 0;
2254
2255         do {
2256                 rc = configure_new_function(ctrl, new_slot, behind_bridge, resources);
2257
2258                 if (rc) {
2259                         dbg("configure_new_function failed %d\n", rc);
2260                         index = 0;
2261
2262                         while (new_slot) {
2263                                 new_slot = cpqhp_slot_find(new_slot->bus, new_slot->device, index++);
2264
2265                                 if (new_slot)
2266                                         cpqhp_return_board_resources(new_slot, resources);
2267                         }
2268
2269                         return rc;
2270                 }
2271
2272                 function++;
2273
2274                 stop_it = 0;
2275
2276                 /* The following loop skips to the next present function
2277                  * and creates a board structure */
2278
2279                 while ((function < max_functions) && (!stop_it)) {
2280                         pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID);
2281
2282                         if (ID == 0xFFFFFFFF) {
2283                                 function++;
2284                         } else {
2285                                 /* Setup slot structure. */
2286                                 new_slot = cpqhp_slot_create(func->bus);
2287
2288                                 if (new_slot == NULL)
2289                                         return 1;
2290
2291                                 new_slot->bus = func->bus;
2292                                 new_slot->device = func->device;
2293                                 new_slot->function = function;
2294                                 new_slot->is_a_board = 1;
2295                                 new_slot->status = 0;
2296
2297                                 stop_it++;
2298                         }
2299                 }
2300
2301         } while (function < max_functions);
2302         dbg("returning from configure_new_device\n");
2303
2304         return 0;
2305 }
2306
2307
2308 /*
2309  * Configuration logic that involves the hotplug data structures and
2310  * their bookkeeping
2311  */
2312
2313
2314 /**
2315  * configure_new_function - Configures the PCI header information of one device
2316  * @ctrl: pointer to controller structure
2317  * @func: pointer to function structure
2318  * @behind_bridge: 1 if this is a recursive call, 0 if not
2319  * @resources: pointer to set of resource lists
2320  *
2321  * Calls itself recursively for bridged devices.
2322  * Returns 0 if success.
2323  */
2324 static int configure_new_function(struct controller *ctrl, struct pci_func *func,
2325                                    u8 behind_bridge,
2326                                    struct resource_lists *resources)
2327 {
2328         int cloop;
2329         u8 IRQ = 0;
2330         u8 temp_byte;
2331         u8 device;
2332         u8 class_code;
2333         u16 command;
2334         u16 temp_word;
2335         u32 temp_dword;
2336         u32 rc;
2337         u32 temp_register;
2338         u32 base;
2339         u32 ID;
2340         unsigned int devfn;
2341         struct pci_resource *mem_node;
2342         struct pci_resource *p_mem_node;
2343         struct pci_resource *io_node;
2344         struct pci_resource *bus_node;
2345         struct pci_resource *hold_mem_node;
2346         struct pci_resource *hold_p_mem_node;
2347         struct pci_resource *hold_IO_node;
2348         struct pci_resource *hold_bus_node;
2349         struct irq_mapping irqs;
2350         struct pci_func *new_slot;
2351         struct pci_bus *pci_bus;
2352         struct resource_lists temp_resources;
2353
2354         pci_bus = ctrl->pci_bus;
2355         pci_bus->number = func->bus;
2356         devfn = PCI_DEVFN(func->device, func->function);
2357
2358         /* Check for Bridge */
2359         rc = pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &temp_byte);
2360         if (rc)
2361                 return rc;
2362
2363         if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
2364                 /* set Primary bus */
2365                 dbg("set Primary bus = %d\n", func->bus);
2366                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_PRIMARY_BUS, func->bus);
2367                 if (rc)
2368                         return rc;
2369
2370                 /* find range of buses to use */
2371                 dbg("find ranges of buses to use\n");
2372                 bus_node = get_max_resource(&(resources->bus_head), 1);
2373
2374                 /* If we don't have any buses to allocate, we can't continue */
2375                 if (!bus_node)
2376                         return -ENOMEM;
2377
2378                 /* set Secondary bus */
2379                 temp_byte = bus_node->base;
2380                 dbg("set Secondary bus = %d\n", bus_node->base);
2381                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SECONDARY_BUS, temp_byte);
2382                 if (rc)
2383                         return rc;
2384
2385                 /* set subordinate bus */
2386                 temp_byte = bus_node->base + bus_node->length - 1;
2387                 dbg("set subordinate bus = %d\n", bus_node->base + bus_node->length - 1);
2388                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
2389                 if (rc)
2390                         return rc;
2391
2392                 /* set subordinate Latency Timer and base Latency Timer */
2393                 temp_byte = 0x40;
2394                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SEC_LATENCY_TIMER, temp_byte);
2395                 if (rc)
2396                         return rc;
2397                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_LATENCY_TIMER, temp_byte);
2398                 if (rc)
2399                         return rc;
2400
2401                 /* set Cache Line size */
2402                 temp_byte = 0x08;
2403                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_CACHE_LINE_SIZE, temp_byte);
2404                 if (rc)
2405                         return rc;
2406
2407                 /* Setup the IO, memory, and prefetchable windows */
2408                 io_node = get_max_resource(&(resources->io_head), 0x1000);
2409                 if (!io_node)
2410                         return -ENOMEM;
2411                 mem_node = get_max_resource(&(resources->mem_head), 0x100000);
2412                 if (!mem_node)
2413                         return -ENOMEM;
2414                 p_mem_node = get_max_resource(&(resources->p_mem_head), 0x100000);
2415                 if (!p_mem_node)
2416                         return -ENOMEM;
2417                 dbg("Setup the IO, memory, and prefetchable windows\n");
2418                 dbg("io_node\n");
2419                 dbg("(base, len, next) (%x, %x, %p)\n", io_node->base,
2420                                         io_node->length, io_node->next);
2421                 dbg("mem_node\n");
2422                 dbg("(base, len, next) (%x, %x, %p)\n", mem_node->base,
2423                                         mem_node->length, mem_node->next);
2424                 dbg("p_mem_node\n");
2425                 dbg("(base, len, next) (%x, %x, %p)\n", p_mem_node->base,
2426                                         p_mem_node->length, p_mem_node->next);
2427
2428                 /* set up the IRQ info */
2429                 if (!resources->irqs) {
2430                         irqs.barber_pole = 0;
2431                         irqs.interrupt[0] = 0;
2432                         irqs.interrupt[1] = 0;
2433                         irqs.interrupt[2] = 0;
2434                         irqs.interrupt[3] = 0;
2435                         irqs.valid_INT = 0;
2436                 } else {
2437                         irqs.barber_pole = resources->irqs->barber_pole;
2438                         irqs.interrupt[0] = resources->irqs->interrupt[0];
2439                         irqs.interrupt[1] = resources->irqs->interrupt[1];
2440                         irqs.interrupt[2] = resources->irqs->interrupt[2];
2441                         irqs.interrupt[3] = resources->irqs->interrupt[3];
2442                         irqs.valid_INT = resources->irqs->valid_INT;
2443                 }
2444
2445                 /* set up resource lists that are now aligned on top and bottom
2446                  * for anything behind the bridge. */
2447                 temp_resources.bus_head = bus_node;
2448                 temp_resources.io_head = io_node;
2449                 temp_resources.mem_head = mem_node;
2450                 temp_resources.p_mem_head = p_mem_node;
2451                 temp_resources.irqs = &irqs;
2452
2453                 /* Make copies of the nodes we are going to pass down so that
2454                  * if there is a problem,we can just use these to free resources
2455                  */
2456                 hold_bus_node = kmalloc(sizeof(*hold_bus_node), GFP_KERNEL);
2457                 hold_IO_node = kmalloc(sizeof(*hold_IO_node), GFP_KERNEL);
2458                 hold_mem_node = kmalloc(sizeof(*hold_mem_node), GFP_KERNEL);
2459                 hold_p_mem_node = kmalloc(sizeof(*hold_p_mem_node), GFP_KERNEL);
2460
2461                 if (!hold_bus_node || !hold_IO_node || !hold_mem_node || !hold_p_mem_node) {
2462                         kfree(hold_bus_node);
2463                         kfree(hold_IO_node);
2464                         kfree(hold_mem_node);
2465                         kfree(hold_p_mem_node);
2466
2467                         return 1;
2468                 }
2469
2470                 memcpy(hold_bus_node, bus_node, sizeof(struct pci_resource));
2471
2472                 bus_node->base += 1;
2473                 bus_node->length -= 1;
2474                 bus_node->next = NULL;
2475
2476                 /* If we have IO resources copy them and fill in the bridge's
2477                  * IO range registers */
2478                 memcpy(hold_IO_node, io_node, sizeof(struct pci_resource));
2479                 io_node->next = NULL;
2480
2481                 /* set IO base and Limit registers */
2482                 temp_byte = io_node->base >> 8;
2483                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_BASE, temp_byte);
2484
2485                 temp_byte = (io_node->base + io_node->length - 1) >> 8;
2486                 rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);
2487
2488                 /* Copy the memory resources and fill in the bridge's memory
2489                  * range registers.
2490                  */
2491                 memcpy(hold_mem_node, mem_node, sizeof(struct pci_resource));
2492                 mem_node->next = NULL;
2493
2494                 /* set Mem base and Limit registers */
2495                 temp_word = mem_node->base >> 16;
2496                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);
2497
2498                 temp_word = (mem_node->base + mem_node->length - 1) >> 16;
2499                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
2500
2501                 memcpy(hold_p_mem_node, p_mem_node, sizeof(struct pci_resource));
2502                 p_mem_node->next = NULL;
2503
2504                 /* set Pre Mem base and Limit registers */
2505                 temp_word = p_mem_node->base >> 16;
2506                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);
2507
2508                 temp_word = (p_mem_node->base + p_mem_node->length - 1) >> 16;
2509                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
2510
2511                 /* Adjust this to compensate for extra adjustment in first loop
2512                  */
2513                 irqs.barber_pole--;
2514
2515                 rc = 0;
2516
2517                 /* Here we actually find the devices and configure them */
2518                 for (device = 0; (device <= 0x1F) && !rc; device++) {
2519                         irqs.barber_pole = (irqs.barber_pole + 1) & 0x03;
2520
2521                         ID = 0xFFFFFFFF;
2522                         pci_bus->number = hold_bus_node->base;
2523                         pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0), 0x00, &ID);
2524                         pci_bus->number = func->bus;
2525
2526                         if (ID != 0xFFFFFFFF) {   /*  device present */
2527                                 /* Setup slot structure. */
2528                                 new_slot = cpqhp_slot_create(hold_bus_node->base);
2529
2530                                 if (new_slot == NULL) {
2531                                         rc = -ENOMEM;
2532                                         continue;
2533                                 }
2534
2535                                 new_slot->bus = hold_bus_node->base;
2536                                 new_slot->device = device;
2537                                 new_slot->function = 0;
2538                                 new_slot->is_a_board = 1;
2539                                 new_slot->status = 0;
2540
2541                                 rc = configure_new_device(ctrl, new_slot, 1, &temp_resources);
2542                                 dbg("configure_new_device rc=0x%x\n", rc);
2543                         }       /* End of IF (device in slot?) */
2544                 }               /* End of FOR loop */
2545
2546                 if (rc)
2547                         goto free_and_out;
2548                 /* save the interrupt routing information */
2549                 if (resources->irqs) {
2550                         resources->irqs->interrupt[0] = irqs.interrupt[0];
2551                         resources->irqs->interrupt[1] = irqs.interrupt[1];
2552                         resources->irqs->interrupt[2] = irqs.interrupt[2];
2553                         resources->irqs->interrupt[3] = irqs.interrupt[3];
2554                         resources->irqs->valid_INT = irqs.valid_INT;
2555                 } else if (!behind_bridge) {
2556                         /* We need to hook up the interrupts here */
2557                         for (cloop = 0; cloop < 4; cloop++) {
2558                                 if (irqs.valid_INT & (0x01 << cloop)) {
2559                                         rc = cpqhp_set_irq(func->bus, func->device,
2560                                                            cloop + 1, irqs.interrupt[cloop]);
2561                                         if (rc)
2562                                                 goto free_and_out;
2563                                 }
2564                         }       /* end of for loop */
2565                 }
2566                 /* Return unused bus resources
2567                  * First use the temporary node to store information for
2568                  * the board */
2569                 if (bus_node && temp_resources.bus_head) {
2570                         hold_bus_node->length = bus_node->base - hold_bus_node->base;
2571
2572                         hold_bus_node->next = func->bus_head;
2573                         func->bus_head = hold_bus_node;
2574
2575                         temp_byte = temp_resources.bus_head->base - 1;
2576
2577                         /* set subordinate bus */
2578                         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, temp_byte);
2579
2580                         if (temp_resources.bus_head->length == 0) {
2581                                 kfree(temp_resources.bus_head);
2582                                 temp_resources.bus_head = NULL;
2583                         } else {
2584                                 return_resource(&(resources->bus_head), temp_resources.bus_head);
2585                         }
2586                 }
2587
2588                 /* If we have IO space available and there is some left,
2589                  * return the unused portion */
2590                 if (hold_IO_node && temp_resources.io_head) {
2591                         io_node = do_pre_bridge_resource_split(&(temp_resources.io_head),
2592                                                                &hold_IO_node, 0x1000);
2593
2594                         /* Check if we were able to split something off */
2595                         if (io_node) {
2596                                 hold_IO_node->base = io_node->base + io_node->length;
2597
2598                                 temp_byte = (hold_IO_node->base) >> 8;
2599                                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_IO_BASE, temp_byte);
2600
2601                                 return_resource(&(resources->io_head), io_node);
2602                         }
2603
2604                         io_node = do_bridge_resource_split(&(temp_resources.io_head), 0x1000);
2605
2606                         /* Check if we were able to split something off */
2607                         if (io_node) {
2608                                 /* First use the temporary node to store
2609                                  * information for the board */
2610                                 hold_IO_node->length = io_node->base - hold_IO_node->base;
2611
2612                                 /* If we used any, add it to the board's list */
2613                                 if (hold_IO_node->length) {
2614                                         hold_IO_node->next = func->io_head;
2615                                         func->io_head = hold_IO_node;
2616
2617                                         temp_byte = (io_node->base - 1) >> 8;
2618                                         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_IO_LIMIT, temp_byte);
2619
2620                                         return_resource(&(resources->io_head), io_node);
2621                                 } else {
2622                                         /* it doesn't need any IO */
2623                                         temp_word = 0x0000;
2624                                         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_IO_LIMIT, temp_word);
2625
2626                                         return_resource(&(resources->io_head), io_node);
2627                                         kfree(hold_IO_node);
2628                                 }
2629                         } else {
2630                                 /* it used most of the range */
2631                                 hold_IO_node->next = func->io_head;
2632                                 func->io_head = hold_IO_node;
2633                         }
2634                 } else if (hold_IO_node) {
2635                         /* it used the whole range */
2636                         hold_IO_node->next = func->io_head;
2637                         func->io_head = hold_IO_node;
2638                 }
2639                 /* If we have memory space available and there is some left,
2640                  * return the unused portion */
2641                 if (hold_mem_node && temp_resources.mem_head) {
2642                         mem_node = do_pre_bridge_resource_split(&(temp_resources.  mem_head),
2643                                                                 &hold_mem_node, 0x100000);
2644
2645                         /* Check if we were able to split something off */
2646                         if (mem_node) {
2647                                 hold_mem_node->base = mem_node->base + mem_node->length;
2648
2649                                 temp_word = (hold_mem_node->base) >> 16;
2650                                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_BASE, temp_word);
2651
2652                                 return_resource(&(resources->mem_head), mem_node);
2653                         }
2654
2655                         mem_node = do_bridge_resource_split(&(temp_resources.mem_head), 0x100000);
2656
2657                         /* Check if we were able to split something off */
2658                         if (mem_node) {
2659                                 /* First use the temporary node to store
2660                                  * information for the board */
2661                                 hold_mem_node->length = mem_node->base - hold_mem_node->base;
2662
2663                                 if (hold_mem_node->length) {
2664                                         hold_mem_node->next = func->mem_head;
2665                                         func->mem_head = hold_mem_node;
2666
2667                                         /* configure end address */
2668                                         temp_word = (mem_node->base - 1) >> 16;
2669                                         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
2670
2671                                         /* Return unused resources to the pool */
2672                                         return_resource(&(resources->mem_head), mem_node);
2673                                 } else {
2674                                         /* it doesn't need any Mem */
2675                                         temp_word = 0x0000;
2676                                         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, temp_word);
2677
2678                                         return_resource(&(resources->mem_head), mem_node);
2679                                         kfree(hold_mem_node);
2680                                 }
2681                         } else {
2682                                 /* it used most of the range */
2683                                 hold_mem_node->next = func->mem_head;
2684                                 func->mem_head = hold_mem_node;
2685                         }
2686                 } else if (hold_mem_node) {
2687                         /* it used the whole range */
2688                         hold_mem_node->next = func->mem_head;
2689                         func->mem_head = hold_mem_node;
2690                 }
2691                 /* If we have prefetchable memory space available and there
2692                  * is some left at the end, return the unused portion */
2693                 if (temp_resources.p_mem_head) {
2694                         p_mem_node = do_pre_bridge_resource_split(&(temp_resources.p_mem_head),
2695                                                                   &hold_p_mem_node, 0x100000);
2696
2697                         /* Check if we were able to split something off */
2698                         if (p_mem_node) {
2699                                 hold_p_mem_node->base = p_mem_node->base + p_mem_node->length;
2700
2701                                 temp_word = (hold_p_mem_node->base) >> 16;
2702                                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, temp_word);
2703
2704                                 return_resource(&(resources->p_mem_head), p_mem_node);
2705                         }
2706
2707                         p_mem_node = do_bridge_resource_split(&(temp_resources.p_mem_head), 0x100000);
2708
2709                         /* Check if we were able to split something off */
2710                         if (p_mem_node) {
2711                                 /* First use the temporary node to store
2712                                  * information for the board */
2713                                 hold_p_mem_node->length = p_mem_node->base - hold_p_mem_node->base;
2714
2715                                 /* If we used any, add it to the board's list */
2716                                 if (hold_p_mem_node->length) {
2717                                         hold_p_mem_node->next = func->p_mem_head;
2718                                         func->p_mem_head = hold_p_mem_node;
2719
2720                                         temp_word = (p_mem_node->base - 1) >> 16;
2721                                         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
2722
2723                                         return_resource(&(resources->p_mem_head), p_mem_node);
2724                                 } else {
2725                                         /* it doesn't need any PMem */
2726                                         temp_word = 0x0000;
2727                                         rc = pci_bus_write_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, temp_word);
2728
2729                                         return_resource(&(resources->p_mem_head), p_mem_node);
2730                                         kfree(hold_p_mem_node);
2731                                 }
2732                         } else {
2733                                 /* it used the most of the range */
2734                                 hold_p_mem_node->next = func->p_mem_head;
2735                                 func->p_mem_head = hold_p_mem_node;
2736                         }
2737                 } else if (hold_p_mem_node) {
2738                         /* it used the whole range */
2739                         hold_p_mem_node->next = func->p_mem_head;
2740                         func->p_mem_head = hold_p_mem_node;
2741                 }
2742                 /* We should be configuring an IRQ and the bridge's base address
2743                  * registers if it needs them.  Although we have never seen such
2744                  * a device */
2745
2746                 /* enable card */
2747                 command = 0x0157;       /* = PCI_COMMAND_IO |
2748                                          *   PCI_COMMAND_MEMORY |
2749                                          *   PCI_COMMAND_MASTER |
2750                                          *   PCI_COMMAND_INVALIDATE |
2751                                          *   PCI_COMMAND_PARITY |
2752                                          *   PCI_COMMAND_SERR */
2753                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
2754
2755                 /* set Bridge Control Register */
2756                 command = 0x07;         /* = PCI_BRIDGE_CTL_PARITY |
2757                                          *   PCI_BRIDGE_CTL_SERR |
2758                                          *   PCI_BRIDGE_CTL_NO_ISA */
2759                 rc = pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, command);
2760         } else if ((temp_byte & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
2761                 /* Standard device */
2762                 rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
2763
2764                 if (class_code == PCI_BASE_CLASS_DISPLAY) {
2765                         /* Display (video) adapter (not supported) */
2766                         return DEVICE_TYPE_NOT_SUPPORTED;
2767                 }
2768                 /* Figure out IO and memory needs */
2769                 for (cloop = 0x10; cloop <= 0x24; cloop += 4) {
2770                         temp_register = 0xFFFFFFFF;
2771
2772                         dbg("CND: bus=%d, devfn=%d, offset=%d\n", pci_bus->number, devfn, cloop);
2773                         rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, temp_register);
2774
2775                         rc = pci_bus_read_config_dword(pci_bus, devfn, cloop, &temp_register);
2776                         dbg("CND: base = 0x%x\n", temp_register);
2777
2778                         if (temp_register) {      /* If this register is implemented */
2779                                 if ((temp_register & 0x03L) == 0x01) {
2780                                         /* Map IO */
2781
2782                                         /* set base = amount of IO space */
2783                                         base = temp_register & 0xFFFFFFFC;
2784                                         base = ~base + 1;
2785
2786                                         dbg("CND:      length = 0x%x\n", base);
2787                                         io_node = get_io_resource(&(resources->io_head), base);
2788                                         if (!io_node)
2789                                                 return -ENOMEM;
2790                                         dbg("Got io_node start = %8.8x, length = %8.8x next (%p)\n",
2791                                             io_node->base, io_node->length, io_node->next);
2792                                         dbg("func (%p) io_head (%p)\n", func, func->io_head);
2793
2794                                         /* allocate the resource to the board */
2795                                         base = io_node->base;
2796                                         io_node->next = func->io_head;
2797                                         func->io_head = io_node;
2798                                 } else if ((temp_register & 0x0BL) == 0x08) {
2799                                         /* Map prefetchable memory */
2800                                         base = temp_register & 0xFFFFFFF0;
2801                                         base = ~base + 1;
2802
2803                                         dbg("CND:      length = 0x%x\n", base);
2804                                         p_mem_node = get_resource(&(resources->p_mem_head), base);
2805
2806                                         /* allocate the resource to the board */
2807                                         if (p_mem_node) {
2808                                                 base = p_mem_node->base;
2809
2810                                                 p_mem_node->next = func->p_mem_head;
2811                                                 func->p_mem_head = p_mem_node;
2812                                         } else
2813                                                 return -ENOMEM;
2814                                 } else if ((temp_register & 0x0BL) == 0x00) {
2815                                         /* Map memory */
2816                                         base = temp_register & 0xFFFFFFF0;
2817                                         base = ~base + 1;
2818
2819                                         dbg("CND:      length = 0x%x\n", base);
2820                                         mem_node = get_resource(&(resources->mem_head), base);
2821
2822                                         /* allocate the resource to the board */
2823                                         if (mem_node) {
2824                                                 base = mem_node->base;
2825
2826                                                 mem_node->next = func->mem_head;
2827                                                 func->mem_head = mem_node;
2828                                         } else
2829                                                 return -ENOMEM;
2830                                 } else {
2831                                         /* Reserved bits or requesting space below 1M */
2832                                         return NOT_ENOUGH_RESOURCES;
2833                                 }
2834
2835                                 rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);
2836
2837                                 /* Check for 64-bit base */
2838                                 if ((temp_register & 0x07L) == 0x04) {
2839                                         cloop += 4;
2840
2841                                         /* Upper 32 bits of address always zero
2842                                          * on today's systems */
2843                                         /* FIXME this is probably not true on
2844                                          * Alpha and ia64??? */
2845                                         base = 0;
2846                                         rc = pci_bus_write_config_dword(pci_bus, devfn, cloop, base);
2847                                 }
2848                         }
2849                 }               /* End of base register loop */
2850                 if (cpqhp_legacy_mode) {
2851                         /* Figure out which interrupt pin this function uses */
2852                         rc = pci_bus_read_config_byte(pci_bus, devfn,
2853                                 PCI_INTERRUPT_PIN, &temp_byte);
2854
2855                         /* If this function needs an interrupt and we are behind
2856                          * a bridge and the pin is tied to something that's
2857                          * already mapped, set this one the same */
2858                         if (temp_byte && resources->irqs &&
2859                             (resources->irqs->valid_INT &
2860                              (0x01 << ((temp_byte + resources->irqs->barber_pole - 1) & 0x03)))) {
2861                                 /* We have to share with something already set up */
2862                                 IRQ = resources->irqs->interrupt[(temp_byte +
2863                                         resources->irqs->barber_pole - 1) & 0x03];
2864                         } else {
2865                                 /* Program IRQ based on card type */
2866                                 rc = pci_bus_read_config_byte(pci_bus, devfn, 0x0B, &class_code);
2867
2868                                 if (class_code == PCI_BASE_CLASS_STORAGE)
2869                                         IRQ = cpqhp_disk_irq;
2870                                 else
2871                                         IRQ = cpqhp_nic_irq;
2872                         }
2873
2874                         /* IRQ Line */
2875                         rc = pci_bus_write_config_byte(pci_bus, devfn, PCI_INTERRUPT_LINE, IRQ);
2876                 }
2877
2878                 if (!behind_bridge) {
2879                         rc = cpqhp_set_irq(func->bus, func->device, temp_byte, IRQ);
2880                         if (rc)
2881                                 return 1;
2882                 } else {
2883                         /* TBD - this code may also belong in the other clause
2884                          * of this If statement */
2885                         resources->irqs->interrupt[(temp_byte + resources->irqs->barber_pole - 1) & 0x03] = IRQ;
2886                         resources->irqs->valid_INT |= 0x01 << (temp_byte + resources->irqs->barber_pole - 1) & 0x03;
2887                 }
2888
2889                 /* Latency Timer */
2890                 temp_byte = 0x40;
2891                 rc = pci_bus_write_config_byte(pci_bus, devfn,
2892                                         PCI_LATENCY_TIMER, temp_byte);
2893
2894                 /* Cache Line size */
2895                 temp_byte = 0x08;
2896                 rc = pci_bus_write_config_byte(pci_bus, devfn,
2897                                         PCI_CACHE_LINE_SIZE, temp_byte);
2898
2899                 /* disable ROM base Address */
2900                 temp_dword = 0x00L;
2901                 rc = pci_bus_write_config_word(pci_bus, devfn,
2902                                         PCI_ROM_ADDRESS, temp_dword);
2903
2904                 /* enable card */
2905                 temp_word = 0x0157;     /* = PCI_COMMAND_IO |
2906                                          *   PCI_COMMAND_MEMORY |
2907                                          *   PCI_COMMAND_MASTER |
2908                                          *   PCI_COMMAND_INVALIDATE |
2909                                          *   PCI_COMMAND_PARITY |
2910                                          *   PCI_COMMAND_SERR */
2911                 rc = pci_bus_write_config_word(pci_bus, devfn,
2912                                         PCI_COMMAND, temp_word);
2913         } else {                /* End of Not-A-Bridge else */
2914                 /* It's some strange type of PCI adapter (Cardbus?) */
2915                 return DEVICE_TYPE_NOT_SUPPORTED;
2916         }
2917
2918         func->configured = 1;
2919
2920         return 0;
2921 free_and_out:
2922         cpqhp_destroy_resource_list(&temp_resources);
2923
2924         return_resource(&(resources->bus_head), hold_bus_node);
2925         return_resource(&(resources->io_head), hold_IO_node);
2926         return_resource(&(resources->mem_head), hold_mem_node);
2927         return_resource(&(resources->p_mem_head), hold_p_mem_node);
2928         return rc;
2929 }