drivers/pci/hotplug/pciehp_pci.c

   1 /*
   2  * PCI Express Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <dely.l.sy@intel.com>
  27  *
  28  */
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/slab.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/pci.h>
  38 #include "../pci.h"
  39 #include "pciehp.h"
  40 #ifndef CONFIG_IA64
  41 #include "../../../arch/i386/pci/pci.h"    /* horrible hack showing how processor dependant we are... */
  42 #endif
  43
  44
  45 int pciehp_configure_device (struct controller* ctrl, struct pci_func* func)
  46 {
  47         unsigned char bus;
  48         struct pci_bus *child;
  49         int num;
  50
  51         if (func->pci_dev == NULL)
  52                 func->pci_dev = pci_find_slot(func->bus, PCI_DEVFN(func->device, func->function));
  53
  54         /* Still NULL ? Well then scan for it ! */
  55         if (func->pci_dev == NULL) {
  56                 dbg("%s: pci_dev still null. do pci_scan_slot\n", __FUNCTION__);
  57
  58                 num = pci_scan_slot(ctrl->pci_dev->subordinate, PCI_DEVFN(func->device, func->function));
  59
  60                 if (num)
  61                         pci_bus_add_devices(ctrl->pci_dev->subordinate);
  62
  63                 func->pci_dev = pci_find_slot(func->bus, PCI_DEVFN(func->device, func->function));
  64                 if (func->pci_dev == NULL) {
  65                         dbg("ERROR: pci_dev still null\n");
  66                         return 0;
  67                 }
  68         }
  69
  70         if (func->pci_dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
  71                 pci_read_config_byte(func->pci_dev, PCI_SECONDARY_BUS, &bus);
  72                 child = pci_add_new_bus(func->pci_dev->bus, (func->pci_dev), bus);
  73                 pci_do_scan_bus(child);
  74
  75         }
  76
  77         return 0;
  78 }
  79
  80
  81 int pciehp_unconfigure_device(struct pci_func* func)
  82 {
  83         int rc = 0;
  84         int j;
  85         struct pci_bus *pbus;
  86
  87         dbg("%s: bus/dev/func = %x/%x/%x\n", __FUNCTION__, func->bus,
  88                                 func->device, func->function);
  89         pbus = func->pci_dev->bus;
  90
  91         for (j=0; j<8 ; j++) {
  92                 struct pci_dev* temp = pci_find_slot(func->bus,
  93                                 (func->device << 3) | j);
  94                 if (temp) {
  95                         pci_remove_bus_device(temp);
  96                 }
  97         }
  98         /*
  99          * Some PCI Express root ports require fixup after hot-plug operation.
 100          */
 101         if (pcie_mch_quirk)
 102                 pci_fixup_device(pci_fixup_final, pbus->self);
 103
 104         return rc;
 105 }
 106
 107 /*
 108  * pciehp_set_irq
 109  *
 110  * @bus_num: bus number of PCI device
 111  * @dev_num: device number of PCI device
 112  * @slot: pointer to u8 where slot number will be returned
 113  */
 114 int pciehp_set_irq (u8 bus_num, u8 dev_num, u8 int_pin, u8 irq_num)
 115 {
 116 #if defined(CONFIG_X86) && !defined(CONFIG_X86_IO_APIC) && !defined(CONFIG_X86_64)
 117         int rc;
 118         u16 temp_word;
 119         struct pci_dev fakedev;
 120         struct pci_bus fakebus;
 121
 122         fakedev.devfn = dev_num << 3;
 123         fakedev.bus = &fakebus;
 124         fakebus.number = bus_num;
 125         dbg("%s: dev %d, bus %d, pin %d, num %d\n",
 126             __FUNCTION__, dev_num, bus_num, int_pin, irq_num);
 127         rc = pcibios_set_irq_routing(&fakedev, int_pin - 0x0a, irq_num);
 128         dbg("%s: rc %d\n", __FUNCTION__, rc);
 129         if (!rc)
 130                 return !rc;
 131
 132         /* set the Edge Level Control Register (ELCR) */
 133         temp_word = inb(0x4d0);
 134         temp_word |= inb(0x4d1) << 8;
 135
 136         temp_word |= 0x01 << irq_num;
 137
 138         /* This should only be for x86 as it sets the Edge Level Control Register */
 139         outb((u8) (temp_word & 0xFF), 0x4d0);
 140         outb((u8) ((temp_word & 0xFF00) >> 8), 0x4d1);
 141 #endif
 142         return 0;
 143 }
 144
 145 /* More PCI configuration routines; this time centered around hotplug controller */
 146
 147
 148 /*
 149  * pciehp_save_config
 150  *
 151  * Reads configuration for all slots in a PCI bus and saves info.
 152  *
 153  * Note:  For non-hot plug busses, the slot # saved is the device #
 154  *
 155  * returns 0 if success
 156  */
 157 int pciehp_save_config(struct controller *ctrl, int busnumber, int num_ctlr_slots, int first_device_num)
 158 {
 159         int rc;
 160         u8 class_code;
 161         u8 header_type;
 162         u32 ID;
 163         u8 secondary_bus;
 164         struct pci_func *new_slot;
 165         int sub_bus;
 166         int max_functions;
 167         int function;
 168         u8 DevError;
 169         int device = 0;
 170         int cloop = 0;
 171         int stop_it;
 172         int index;
 173         int is_hot_plug = num_ctlr_slots || first_device_num;
 174         struct pci_bus lpci_bus, *pci_bus;
 175         int FirstSupported, LastSupported;
 176
 177         dbg("%s: Enter\n", __FUNCTION__);
 178
 179         memcpy(&lpci_bus, ctrl->pci_dev->subordinate, sizeof(lpci_bus));
 180         pci_bus = &lpci_bus;
 181
 182         dbg("%s: num_ctlr_slots = %d, first_device_num = %d\n", __FUNCTION__,
 183                                 num_ctlr_slots, first_device_num);
 184
 185         /*   Decide which slots are supported */
 186         if (is_hot_plug) {
 187                 /*********************************
 188                  *  is_hot_plug is the slot mask
 189                  *********************************/
 190                 FirstSupported = first_device_num;
 191                 LastSupported = FirstSupported + num_ctlr_slots - 1;
 192         } else {
 193                 FirstSupported = 0;
 194                 LastSupported = 0x1F;
 195         }
 196
 197         dbg("FirstSupported = %d, LastSupported = %d\n", FirstSupported,
 198                                         LastSupported);
 199
 200         /*   Save PCI configuration space for all devices in supported slots */
 201         dbg("%s: pci_bus->number = %x\n", __FUNCTION__, pci_bus->number);
 202         pci_bus->number = busnumber;
 203         dbg("%s: bus = %x, dev = %x\n", __FUNCTION__, busnumber, device);
 204         for (device = FirstSupported; device <= LastSupported; device++) {
 205                 ID = 0xFFFFFFFF;
 206                 rc = pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0),
 207                                         PCI_VENDOR_ID, &ID);
 208
 209                 if (ID != 0xFFFFFFFF) {   /*  device in slot */
 210                         dbg("%s: ID = %x\n", __FUNCTION__, ID);
 211                         rc = pci_bus_read_config_byte(pci_bus, PCI_DEVFN(device, 0),
 212                                         0x0B, &class_code);
 213                         if (rc)
 214                                 return rc;
 215
 216                         rc = pci_bus_read_config_byte(pci_bus, PCI_DEVFN(device, 0),
 217                                         PCI_HEADER_TYPE, &header_type);
 218                         if (rc)
 219                                 return rc;
 220
 221                         dbg("class_code = %x, header_type = %x\n", class_code, header_type);
 222
 223                         /* If multi-function device, set max_functions to 8 */
 224                         if (header_type & 0x80)
 225                                 max_functions = 8;
 226                         else
 227                                 max_functions = 1;
 228
 229                         function = 0;
 230
 231                         do {
 232                                 DevError = 0;
 233                                 dbg("%s: In do loop\n", __FUNCTION__);
 234
 235                                 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {   /* P-P Bridge */
 236                                         /* Recurse the subordinate bus
 237                                          * get the subordinate bus number
 238                                          */
 239                                         rc = pci_bus_read_config_byte(pci_bus,
 240                                                 PCI_DEVFN(device, function),
 241                                                 PCI_SECONDARY_BUS, &secondary_bus);
 242                                         if (rc) {
 243                                                 return rc;
 244                                         } else {
 245                                                 sub_bus = (int) secondary_bus;
 246
 247                                                 /* Save secondary bus cfg spc with this recursive call. */
 248                                                 rc = pciehp_save_config(ctrl, sub_bus, 0, 0);
 249                                                 if (rc)
 250                                                         return rc;
 251                                         }
 252                                 }
 253
 254                                 index = 0;
 255                                 new_slot = pciehp_slot_find(busnumber, device, index++);
 256
 257                                 dbg("%s: new_slot = %p bus %x dev %x fun %x\n",
 258                                 __FUNCTION__, new_slot, busnumber, device, index-1);
 259
 260                                 while (new_slot && (new_slot->function != (u8) function)) {
 261                                         new_slot = pciehp_slot_find(busnumber, device, index++);
 262                                         dbg("%s: while loop, new_slot = %p bus %x dev %x fun %x\n",
 263                                         __FUNCTION__, new_slot, busnumber, device, index-1);
 264                                 }
 265                                 if (!new_slot) {
 266                                         /* Setup slot structure. */
 267                                         new_slot = pciehp_slot_create(busnumber);
 268                                         dbg("%s: if, new_slot = %p bus %x dev %x fun %x\n",
 269                                         __FUNCTION__, new_slot, busnumber, device, function);
 270
 271                                         if (new_slot == NULL)
 272                                                 return(1);
 273                                 }
 274
 275                                 new_slot->bus = (u8) busnumber;
 276                                 new_slot->device = (u8) device;
 277                                 new_slot->function = (u8) function;
 278                                 new_slot->is_a_board = 1;
 279                                 new_slot->switch_save = 0x10;
 280                                 /* In case of unsupported board */
 281                                 new_slot->status = DevError;
 282                                 new_slot->pci_dev = pci_find_slot(new_slot->bus,
 283                                         (new_slot->device << 3) | new_slot->function);
 284                                 dbg("new_slot->pci_dev = %p\n", new_slot->pci_dev);
 285
 286                                 for (cloop = 0; cloop < 0x20; cloop++) {
 287                                         rc = pci_bus_read_config_dword(pci_bus,
 288                                                 PCI_DEVFN(device, function),
 289                                                 cloop << 2,
 290                                                 (u32 *) &(new_slot->config_space [cloop]));
 291                                         /* dbg("new_slot->config_space[%x] = %x\n",
 292                                                 cloop, new_slot->config_space[cloop]); */
 293                                         if (rc)
 294                                                 return rc;
 295                                 }
 296
 297                                 function++;
 298
 299                                 stop_it = 0;
 300
 301                                 /*  this loop skips to the next present function
 302                                  *  reading in Class Code and Header type.
 303                                  */
 304
 305                                 while ((function < max_functions)&&(!stop_it)) {
 306                                         dbg("%s: In while loop \n", __FUNCTION__);
 307                                         rc = pci_bus_read_config_dword(pci_bus,
 308                                                         PCI_DEVFN(device, function),
 309                                                         PCI_VENDOR_ID, &ID);
 310
 311                                         if (ID == 0xFFFFFFFF) {  /* nothing there. */
 312                                                 function++;
 313                                                 dbg("Nothing there\n");
 314                                         } else {  /* Something there */
 315                                                 rc = pci_bus_read_config_byte(pci_bus,
 316                                                         PCI_DEVFN(device, function),
 317                                                         0x0B, &class_code);
 318                                                 if (rc)
 319                                                         return rc;
 320
 321                                                 rc = pci_bus_read_config_byte(pci_bus,
 322                                                         PCI_DEVFN(device, function),
 323                                                         PCI_HEADER_TYPE, &header_type);
 324                                                 if (rc)
 325                                                         return rc;
 326
 327                                                 dbg("class_code = %x, header_type = %x\n", class_code, header_type);
 328                                                 stop_it++;
 329                                         }
 330                                 }
 331
 332                         } while (function < max_functions);
 333                         /* End of IF (device in slot?) */
 334                 } else if (is_hot_plug) {
 335                         /* Setup slot structure with entry for empty slot */
 336                         new_slot = pciehp_slot_create(busnumber);
 337
 338                         if (new_slot == NULL) {
 339                                 return(1);
 340                         }
 341                         dbg("new_slot = %p, bus = %x, dev = %x, fun = %x\n", new_slot,
 342                                 new_slot->bus, new_slot->device, new_slot->function);
 343
 344                         new_slot->bus = (u8) busnumber;
 345                         new_slot->device = (u8) device;
 346                         new_slot->function = 0;
 347                         new_slot->is_a_board = 0;
 348                         new_slot->presence_save = 0;
 349                         new_slot->switch_save = 0;
 350                 }
 351         }                       /* End of FOR loop */
 352
 353         dbg("%s: Exit\n", __FUNCTION__);
 354         return(0);
 355 }
 356
 357
 358 /*
 359  * pciehp_save_slot_config
 360  *
 361  * Saves configuration info for all PCI devices in a given slot
 362  * including subordinate busses.
 363  *
 364  * returns 0 if success
 365  */
 366 int pciehp_save_slot_config(struct controller *ctrl, struct pci_func * new_slot)
 367 {
 368         int rc;
 369         u8 class_code;
 370         u8 header_type;
 371         u32 ID;
 372         u8 secondary_bus;
 373         int sub_bus;
 374         int max_functions;
 375         int function;
 376         int cloop = 0;
 377         int stop_it;
 378         struct pci_bus lpci_bus, *pci_bus;
 379         memcpy(&lpci_bus, ctrl->pci_dev->subordinate, sizeof(lpci_bus));
 380         pci_bus = &lpci_bus;
 381         pci_bus->number = new_slot->bus;
 382
 383         ID = 0xFFFFFFFF;
 384
 385         pci_bus_read_config_dword(pci_bus, PCI_DEVFN(new_slot->device, 0),
 386                                         PCI_VENDOR_ID, &ID);
 387
 388         if (ID != 0xFFFFFFFF) {   /*  device in slot */
 389                 pci_bus_read_config_byte(pci_bus, PCI_DEVFN(new_slot->device, 0),
 390                                         0x0B, &class_code);
 391
 392                 pci_bus_read_config_byte(pci_bus, PCI_DEVFN(new_slot->device, 0),
 393                                         PCI_HEADER_TYPE, &header_type);
 394
 395                 if (header_type & 0x80) /* Multi-function device */
 396                         max_functions = 8;
 397                 else
 398                         max_functions = 1;
 399
 400                 function = 0;
 401
 402                 do {
 403                         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {     /* PCI-PCI Bridge */
 404                                 /*  Recurse the subordinate bus */
 405                                 pci_bus_read_config_byte(pci_bus,
 406                                         PCI_DEVFN(new_slot->device, function),
 407                                         PCI_SECONDARY_BUS, &secondary_bus);
 408
 409                                 sub_bus = (int) secondary_bus;
 410
 411                                 /* Save the config headers for the secondary bus. */
 412                                 rc = pciehp_save_config(ctrl, sub_bus, 0, 0);
 413
 414                                 if (rc)
 415                                         return rc;
 416
 417                         }       /* End of IF */
 418
 419                         new_slot->status = 0;
 420
 421                         for (cloop = 0; cloop < 0x20; cloop++) {
 422                                 pci_bus_read_config_dword(pci_bus,
 423                                         PCI_DEVFN(new_slot->device, function),
 424                                         cloop << 2,
 425                                         (u32 *) &(new_slot->config_space [cloop]));
 426                         }
 427
 428                         function++;
 429
 430                         stop_it = 0;
 431
 432                         /*  this loop skips to the next present function
 433                          *  reading in the Class Code and the Header type.
 434                          */
 435
 436                         while ((function < max_functions) && (!stop_it)) {
 437                                 pci_bus_read_config_dword(pci_bus,
 438                                         PCI_DEVFN(new_slot->device, function),
 439                                         PCI_VENDOR_ID, &ID);
 440
 441                                 if (ID == 0xFFFFFFFF) {  /* nothing there. */
 442                                         function++;
 443                                 } else {  /* Something there */
 444                                         pci_bus_read_config_byte(pci_bus,
 445                                                 PCI_DEVFN(new_slot->device, function),
 446                                                 0x0B, &class_code);
 447
 448                                         pci_bus_read_config_byte(pci_bus,
 449                                                 PCI_DEVFN(new_slot->device, function),
 450                                                 PCI_HEADER_TYPE, &header_type);
 451
 452                                         stop_it++;
 453                                 }
 454                         }
 455
 456                 } while (function < max_functions);
 457         }                       /* End of IF (device in slot?) */
 458         else {
 459                 return 2;
 460         }
 461
 462         return 0;
 463 }
 464
 465
 466 /*
 467  * pciehp_save_used_resources
 468  *
 469  * Stores used resource information for existing boards.  this is
 470  * for boards that were in the system when this driver was loaded.
 471  * this function is for hot plug ADD
 472  *
 473  * returns 0 if success
 474  * if disable  == 1(DISABLE_CARD),
 475  *  it loops for all functions of the slot and disables them.
 476  * else, it just get resources of the function and return.
 477  */
 478 int pciehp_save_used_resources(struct controller *ctrl, struct pci_func *func, int disable)
 479 {
 480         u8 cloop;
 481         u8 header_type;
 482         u8 secondary_bus;
 483         u8 temp_byte;
 484         u16 command;
 485         u16 save_command;
 486         u16 w_base, w_length;
 487         u32 temp_register;
 488         u32 save_base;
 489         u32 base, length;
 490         u64 base64 = 0;
 491         int index = 0;
 492         unsigned int devfn;
 493         struct pci_resource *mem_node = NULL;
 494         struct pci_resource *p_mem_node = NULL;
 495         struct pci_resource *t_mem_node;
 496         struct pci_resource *io_node;
 497         struct pci_resource *bus_node;
 498         struct pci_bus lpci_bus, *pci_bus;
 499         memcpy(&lpci_bus, ctrl->pci_dev->subordinate, sizeof(lpci_bus));
 500         pci_bus = &lpci_bus;
 501
 502         if (disable)
 503                 func = pciehp_slot_find(func->bus, func->device, index++);
 504
 505         while ((func != NULL) && func->is_a_board) {
 506                 pci_bus->number = func->bus;
 507                 devfn = PCI_DEVFN(func->device, func->function);
 508
 509                 /* Save the command register */
 510                 pci_bus_read_config_word(pci_bus, devfn, PCI_COMMAND, &save_command);
 511
 512                 if (disable) {
 513                         /* disable card */
 514                         command = 0x00;
 515                         pci_bus_write_config_word(pci_bus, devfn, PCI_COMMAND, command);
 516                 }
 517
 518                 /* Check for Bridge */
 519                 pci_bus_read_config_byte(pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
 520
 521                 if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {     /* PCI-PCI Bridge */
 522                         dbg("Save_used_res of PCI bridge b:d=0x%x:%x, sc=0x%x\n",
 523                                         func->bus, func->device, save_command);
 524                         if (disable) {
 525                                 /* Clear Bridge Control Register */
 526                                 command = 0x00;
 527                                 pci_bus_write_config_word(pci_bus, devfn, PCI_BRIDGE_CONTROL, command);
 528                         }
 529
 530                         pci_bus_read_config_byte(pci_bus, devfn, PCI_SECONDARY_BUS, &secondary_bus);
 531                         pci_bus_read_config_byte(pci_bus, devfn, PCI_SUBORDINATE_BUS, &temp_byte);
 532
 533                         bus_node = kmalloc(sizeof(struct pci_resource),
 534                                                 GFP_KERNEL);
 535                         if (!bus_node)
 536                                 return -ENOMEM;
 537
 538                         bus_node->base = (ulong)secondary_bus;
 539                         bus_node->length = (ulong)(temp_byte - secondary_bus + 1);
 540
 541                         bus_node->next = func->bus_head;
 542                         func->bus_head = bus_node;
 543
 544                         /* Save IO base and Limit registers */
 545                         pci_bus_read_config_byte(pci_bus, devfn, PCI_IO_BASE, &temp_byte);
 546                         base = temp_byte;
 547                         pci_bus_read_config_byte(pci_bus, devfn, PCI_IO_LIMIT, &temp_byte);
 548                         length = temp_byte;
 549
 550                         if ((base <= length) && (!disable || (save_command & PCI_COMMAND_IO))) {
 551                                 io_node = kmalloc(sizeof(struct pci_resource),
 552                                                         GFP_KERNEL);
 553                                 if (!io_node)
 554                                         return -ENOMEM;
 555
 556                                 io_node->base = (ulong)(base & PCI_IO_RANGE_MASK) << 8;
 557                                 io_node->length = (ulong)(length - base + 0x10) << 8;
 558
 559                                 io_node->next = func->io_head;
 560                                 func->io_head = io_node;
 561                         }
 562
 563                         /* Save memory base and Limit registers */
 564                         pci_bus_read_config_word(pci_bus, devfn, PCI_MEMORY_BASE, &w_base);
 565                         pci_bus_read_config_word(pci_bus, devfn, PCI_MEMORY_LIMIT, &w_length);
 566
 567                         if ((w_base <= w_length) && (!disable || (save_command & PCI_COMMAND_MEMORY))) {
 568                                 mem_node = kmalloc(sizeof(struct pci_resource),
 569                                                 GFP_KERNEL);
 570                                 if (!mem_node)
 571                                         return -ENOMEM;
 572
 573                                 mem_node->base = (ulong)w_base << 16;
 574                                 mem_node->length = (ulong)(w_length - w_base + 0x10) << 16;
 575
 576                                 mem_node->next = func->mem_head;
 577                                 func->mem_head = mem_node;
 578                         }
 579                         /* Save prefetchable memory base and Limit registers */
 580                         pci_bus_read_config_word(pci_bus, devfn, PCI_PREF_MEMORY_BASE, &w_base);
 581                         pci_bus_read_config_word(pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &w_length);
 582
 583                         if ((w_base <= w_length) && (!disable || (save_command & PCI_COMMAND_MEMORY))) {
 584                                 p_mem_node = kmalloc(sizeof(struct pci_resource),
 585                                                 GFP_KERNEL);
 586                                 if (!p_mem_node)
 587                                         return -ENOMEM;
 588
 589                                 p_mem_node->base = (ulong)w_base << 16;
 590                                 p_mem_node->length = (ulong)(w_length - w_base + 0x10) << 16;
 591
 592                                 p_mem_node->next = func->p_mem_head;
 593                                 func->p_mem_head = p_mem_node;
 594                         }
 595                 } else if ((header_type & 0x7F) == PCI_HEADER_TYPE_NORMAL) {
 596                         dbg("Save_used_res of PCI adapter b:d=0x%x:%x, sc=0x%x\n",
 597                                         func->bus, func->device, save_command);
 598
 599                         /* Figure out IO and memory base lengths */
 600                         for (cloop = PCI_BASE_ADDRESS_0; cloop <= PCI_BASE_ADDRESS_5; cloop += 4) {
 601                                 pci_bus_read_config_dword(pci_bus, devfn, cloop, &save_base);
 602
 603                                 temp_register = 0xFFFFFFFF;
 604                                 pci_bus_write_config_dword(pci_bus, devfn, cloop, temp_register);
 605                                 pci_bus_read_config_dword(pci_bus, devfn, cloop, &temp_register);
 606
 607                                 if (!disable)
 608                                         pci_bus_write_config_dword(pci_bus, devfn, cloop, save_base);
 609
 610                                 if (!temp_register)
 611                                         continue;
 612
 613                                 base = temp_register;
 614
 615                                 if ((base & PCI_BASE_ADDRESS_SPACE_IO) &&
 616                                                 (!disable || (save_command & PCI_COMMAND_IO))) {
 617                                         /* IO base */
 618                                         /* set temp_register = amount of IO space requested */
 619                                         base = base & 0xFFFFFFFCL;
 620                                         base = (~base) + 1;
 621
 622                                         io_node = kmalloc(sizeof (struct pci_resource),
 623                                                                 GFP_KERNEL);
 624                                         if (!io_node)
 625                                                 return -ENOMEM;
 626
 627                                         io_node->base = (ulong)save_base & PCI_BASE_ADDRESS_IO_MASK;
 628                                         io_node->length = (ulong)base;
 629                                         dbg("sur adapter: IO bar=0x%x(length=0x%x)\n",
 630                                                 io_node->base, io_node->length);
 631
 632                                         io_node->next = func->io_head;
 633                                         func->io_head = io_node;
 634                                 } else {  /* map Memory */
 635                                         int prefetchable = 1;
 636                                         /* struct pci_resources **res_node; */
 637                                         char *res_type_str = "PMEM";
 638                                         u32 temp_register2;
 639
 640                                         t_mem_node = kmalloc(sizeof (struct pci_resource),
 641                                                                 GFP_KERNEL);
 642                                         if (!t_mem_node)
 643                                                 return -ENOMEM;
 644
 645                                         if (!(base & PCI_BASE_ADDRESS_MEM_PREFETCH) &&
 646                                                         (!disable || (save_command & PCI_COMMAND_MEMORY))) {
 647                                                 prefetchable = 0;
 648                                                 mem_node = t_mem_node;
 649                                                 res_type_str++;
 650                                         } else
 651                                                 p_mem_node = t_mem_node;
 652
 653                                         base = base & 0xFFFFFFF0L;
 654                                         base = (~base) + 1;
 655
 656                                         switch (temp_register & PCI_BASE_ADDRESS_MEM_TYPE_MASK) {
 657                                         case PCI_BASE_ADDRESS_MEM_TYPE_32:
 658                                                 if (prefetchable) {
 659                                                         p_mem_node->base = (ulong)save_base & PCI_BASE_ADDRESS_MEM_MASK;
 660                                                         p_mem_node->length = (ulong)base;
 661                                                         dbg("sur adapter: 32 %s bar=0x%x(length=0x%x)\n",
 662                                                                 res_type_str,
 663                                                                 p_mem_node->base,
 664                                                                 p_mem_node->length);
 665
 666                                                         p_mem_node->next = func->p_mem_head;
 667                                                         func->p_mem_head = p_mem_node;
 668                                                 } else {
 669                                                         mem_node->base = (ulong)save_base & PCI_BASE_ADDRESS_MEM_MASK;
 670                                                         mem_node->length = (ulong)base;
 671                                                         dbg("sur adapter: 32 %s bar=0x%x(length=0x%x)\n",
 672                                                                 res_type_str,
 673                                                                 mem_node->base,
 674                                                                 mem_node->length);
 675
 676                                                         mem_node->next = func->mem_head;
 677                                                         func->mem_head = mem_node;
 678                                                 }
 679                                                 break;
 680                                         case PCI_BASE_ADDRESS_MEM_TYPE_64:
 681                                                 pci_bus_read_config_dword(pci_bus, devfn, cloop+4, &temp_register2);
 682                                                 base64 = temp_register2;
 683                                                 base64 = (base64 << 32) | save_base;
 684
 685                                                 if (temp_register2) {
 686                                                         dbg("sur adapter: 64 %s high dword of base64(0x%x:%x) masked to 0\n",
 687                                                                 res_type_str, temp_register2, (u32)base64);
 688                                                         base64 &= 0x00000000FFFFFFFFL;
 689                                                 }
 690
 691                                                 if (prefetchable) {
 692                                                         p_mem_node->base = base64 & PCI_BASE_ADDRESS_MEM_MASK;
 693                                                         p_mem_node->length = base;
 694                                                         dbg("sur adapter: 64 %s base=0x%x(len=0x%x)\n",
 695                                                                 res_type_str,
 696                                                                 p_mem_node->base,
 697                                                                 p_mem_node->length);
 698
 699                                                         p_mem_node->next = func->p_mem_head;
 700                                                         func->p_mem_head = p_mem_node;
 701                                                 } else {
 702                                                         mem_node->base = base64 & PCI_BASE_ADDRESS_MEM_MASK;
 703                                                         mem_node->length = base;
 704                                                         dbg("sur adapter: 64 %s base=0x%x(len=0x%x)\n",
 705                                                                 res_type_str,
 706                                                                 mem_node->base,
 707                                                                 mem_node->length);
 708
 709                                                         mem_node->next = func->mem_head;
 710                                                         func->mem_head = mem_node;
 711                                                 }
 712                                                 cloop += 4;
 713                                                 break;
 714                                         default:
 715                                                 dbg("asur: reserved BAR type=0x%x\n",
 716                                                         temp_register);
 717                                                 break;
 718                                         }
 719                                 }
 720                         }       /* End of base register loop */
 721                 } else {        /* Some other unknown header type */
 722                         dbg("Save_used_res of PCI unknown type b:d=0x%x:%x. skip.\n",
 723                                         func->bus, func->device);
 724                 }
 725
 726                 /* find the next device in this slot */
 727                 if (!disable)
 728                         break;
 729                 func = pciehp_slot_find(func->bus, func->device, index++);
 730         }
 731
 732         return 0;
 733 }
 734
 735
 736 /**
 737  * kfree_resource_list: release memory of all list members
 738  * @res: resource list to free
 739  */
 740 static inline void
 741 return_resource_list(struct pci_resource **func, struct pci_resource **res)
 742 {
 743         struct pci_resource *node;
 744         struct pci_resource *t_node;
 745
 746         node = *func;
 747         *func = NULL;
 748         while (node) {
 749                 t_node = node->next;
 750                 return_resource(res, node);
 751                 node = t_node;
 752         }
 753 }
 754
 755 /*
 756  * pciehp_return_board_resources
 757  *
 758  * this routine returns all resources allocated to a board to
 759  * the available pool.
 760  *
 761  * returns 0 if success
 762  */
 763 int pciehp_return_board_resources(struct pci_func * func,
 764                                 struct resource_lists * resources)
 765 {
 766         int rc;
 767
 768         dbg("%s\n", __FUNCTION__);
 769
 770         if (!func)
 771                 return 1;
 772
 773         return_resource_list(&(func->io_head),&(resources->io_head));
 774         return_resource_list(&(func->mem_head),&(resources->mem_head));
 775         return_resource_list(&(func->p_mem_head),&(resources->p_mem_head));
 776         return_resource_list(&(func->bus_head),&(resources->bus_head));
 777
 778         rc = pciehp_resource_sort_and_combine(&(resources->mem_head));
 779         rc |= pciehp_resource_sort_and_combine(&(resources->p_mem_head));
 780         rc |= pciehp_resource_sort_and_combine(&(resources->io_head));
 781         rc |= pciehp_resource_sort_and_combine(&(resources->bus_head));
 782
 783         return rc;
 784 }
 785
 786 /**
 787  * kfree_resource_list: release memory of all list members
 788  * @res: resource list to free
 789  */
 790 static inline void
 791 kfree_resource_list(struct pci_resource **r)
 792 {
 793         struct pci_resource *res, *tres;
 794
 795         res = *r;
 796         *r = NULL;
 797
 798         while (res) {
 799                 tres = res;
 800                 res = res->next;
 801                 kfree(tres);
 802         }
 803 }
 804
 805 /**
 806  * pciehp_destroy_resource_list: put node back in the resource list
 807  * @resources: list to put nodes back
 808  */
 809 void pciehp_destroy_resource_list(struct resource_lists * resources)
 810 {
 811         kfree_resource_list(&(resources->io_head));
 812         kfree_resource_list(&(resources->mem_head));
 813         kfree_resource_list(&(resources->p_mem_head));
 814         kfree_resource_list(&(resources->bus_head));
 815 }
 816
 817 /**
 818  * pciehp_destroy_board_resources: put node back in the resource list
 819  * @resources: list to put nodes back
 820  */
 821 void pciehp_destroy_board_resources(struct pci_func * func)
 822 {
 823         kfree_resource_list(&(func->io_head));
 824         kfree_resource_list(&(func->mem_head));
 825         kfree_resource_list(&(func->p_mem_head));
 826         kfree_resource_list(&(func->bus_head));
 827 }