drivers/pci/pci.c

   1 /*
   2  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   3  * Andreas Heppel <aheppel@sysgo.de>
   4  *
   5  * (C) Copyright 2002, 2003
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /*
  28  * PCI routines
  29  */
  30
  31 #include <common.h>
  32
  33 #include <command.h>
  34 #include <asm/processor.h>
  35 #include <asm/io.h>
  36 #include <pci.h>
  37
  38 #define PCI_HOSE_OP(rw, size, type)                                     \
  39 int pci_hose_##rw##_config_##size(struct pci_controller *hose,          \
  40                                   pci_dev_t dev,                        \
  41                                   int offset, type value)               \
  42 {                                                                       \
  43         return hose->rw##_##size(hose, dev, offset, value);             \
  44 }
  45
  46 PCI_HOSE_OP(read, byte, u8 *)
  47 PCI_HOSE_OP(read, word, u16 *)
  48 PCI_HOSE_OP(read, dword, u32 *)
  49 PCI_HOSE_OP(write, byte, u8)
  50 PCI_HOSE_OP(write, word, u16)
  51 PCI_HOSE_OP(write, dword, u32)
  52
  53 #ifndef CONFIG_IXP425
  54 #define PCI_OP(rw, size, type, error_code)                              \
  55 int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)     \
  56 {                                                                       \
  57         struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));    \
  58                                                                         \
  59         if (!hose)                                                      \
  60         {                                                               \
  61                 error_code;                                             \
  62                 return -1;                                              \
  63         }                                                               \
  64                                                                         \
  65         return pci_hose_##rw##_config_##size(hose, dev, offset, value); \
  66 }
  67
  68 PCI_OP(read, byte, u8 *, *value = 0xff)
  69 PCI_OP(read, word, u16 *, *value = 0xffff)
  70 PCI_OP(read, dword, u32 *, *value = 0xffffffff)
  71 PCI_OP(write, byte, u8, )
  72 PCI_OP(write, word, u16, )
  73 PCI_OP(write, dword, u32, )
  74 #endif  /* CONFIG_IXP425 */
  75
  76 #define PCI_READ_VIA_DWORD_OP(size, type, off_mask)                     \
  77 int pci_hose_read_config_##size##_via_dword(struct pci_controller *hose,\
  78                                         pci_dev_t dev,                  \
  79                                         int offset, type val)           \
  80 {                                                                       \
  81         u32 val32;                                                      \
  82                                                                         \
  83         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0) { \
  84                 *val = -1;                                              \
  85                 return -1;                                              \
  86         }                                                               \
  87                                                                         \
  88         *val = (val32 >> ((offset & (int)off_mask) * 8));               \
  89                                                                         \
  90         return 0;                                                       \
  91 }
  92
  93 #define PCI_WRITE_VIA_DWORD_OP(size, type, off_mask, val_mask)          \
  94 int pci_hose_write_config_##size##_via_dword(struct pci_controller *hose,\
  95                                              pci_dev_t dev,             \
  96                                              int offset, type val)      \
  97 {                                                                       \
  98         u32 val32, mask, ldata, shift;                                  \
  99                                                                         \
 100         if (pci_hose_read_config_dword(hose, dev, offset & 0xfc, &val32) < 0)\
 101                 return -1;                                              \
 102                                                                         \
 103         shift = ((offset & (int)off_mask) * 8);                         \
 104         ldata = (((unsigned long)val) & val_mask) << shift;             \
 105         mask = val_mask << shift;                                       \
 106         val32 = (val32 & ~mask) | ldata;                                \
 107                                                                         \
 108         if (pci_hose_write_config_dword(hose, dev, offset & 0xfc, val32) < 0)\
 109                 return -1;                                              \
 110                                                                         \
 111         return 0;                                                       \
 112 }
 113
 114 PCI_READ_VIA_DWORD_OP(byte, u8 *, 0x03)
 115 PCI_READ_VIA_DWORD_OP(word, u16 *, 0x02)
 116 PCI_WRITE_VIA_DWORD_OP(byte, u8, 0x03, 0x000000ff)
 117 PCI_WRITE_VIA_DWORD_OP(word, u16, 0x02, 0x0000ffff)
 118
 119 /* Get a virtual address associated with a BAR region */
 120 void *pci_map_bar(pci_dev_t pdev, int bar, int flags)
 121 {
 122         pci_addr_t pci_bus_addr;
 123         u32 bar_response;
 124
 125         /* read BAR address */
 126         pci_read_config_dword(pdev, bar, &bar_response);
 127         pci_bus_addr = (pci_addr_t)(bar_response & ~0xf);
 128
 129         /*
 130          * Pass "0" as the length argument to pci_bus_to_virt.  The arg
 131          * isn't actualy used on any platform because u-boot assumes a static
 132          * linear mapping.  In the future, this could read the BAR size
 133          * and pass that as the size if needed.
 134          */
 135         return pci_bus_to_virt(pdev, pci_bus_addr, flags, 0, MAP_NOCACHE);
 136 }
 137
 138 /*
 139  *
 140  */
 141
 142 static struct pci_controller* hose_head;
 143
 144 void pci_register_hose(struct pci_controller* hose)
 145 {
 146         struct pci_controller **phose = &hose_head;
 147
 148         while(*phose)
 149                 phose = &(*phose)->next;
 150
 151         hose->next = NULL;
 152
 153         *phose = hose;
 154 }
 155
 156 struct pci_controller *pci_bus_to_hose (int bus)
 157 {
 158         struct pci_controller *hose;
 159
 160         for (hose = hose_head; hose; hose = hose->next)
 161                 if (bus >= hose->first_busno && bus <= hose->last_busno)
 162                         return hose;
 163
 164         printf("pci_bus_to_hose() failed\n");
 165         return NULL;
 166 }
 167
 168 int pci_last_busno(void)
 169 {
 170         struct pci_controller *hose = hose_head;
 171
 172         if (!hose)
 173                 return -1;
 174
 175         while (hose->next)
 176                 hose = hose->next;
 177
 178         return hose->last_busno;
 179 }
 180
 181 #ifndef CONFIG_IXP425
 182 pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 183 {
 184         struct pci_controller * hose;
 185         u16 vendor, device;
 186         u8 header_type;
 187         pci_dev_t bdf;
 188         int i, bus, found_multi = 0;
 189
 190         for (hose = hose_head; hose; hose = hose->next)
 191         {
 192 #ifdef CONFIG_SYS_SCSI_SCAN_BUS_REVERSE
 193                 for (bus = hose->last_busno; bus >= hose->first_busno; bus--)
 194 #else
 195                 for (bus = hose->first_busno; bus <= hose->last_busno; bus++)
 196 #endif
 197                         for (bdf = PCI_BDF(bus,0,0);
 198 #if defined(CONFIG_ELPPC) || defined(CONFIG_PPMC7XX)
 199                              bdf < PCI_BDF(bus,PCI_MAX_PCI_DEVICES-1,PCI_MAX_PCI_FUNCTIONS-1);
 200 #else
 201                              bdf < PCI_BDF(bus+1,0,0);
 202 #endif
 203                              bdf += PCI_BDF(0,0,1))
 204                         {
 205                                 if (!PCI_FUNC(bdf)) {
 206                                         pci_read_config_byte(bdf,
 207                                                              PCI_HEADER_TYPE,
 208                                                              &header_type);
 209
 210                                         found_multi = header_type & 0x80;
 211                                 } else {
 212                                         if (!found_multi)
 213                                                 continue;
 214                                 }
 215
 216                                 pci_read_config_word(bdf,
 217                                                      PCI_VENDOR_ID,
 218                                                      &vendor);
 219                                 pci_read_config_word(bdf,
 220                                                      PCI_DEVICE_ID,
 221                                                      &device);
 222
 223                                 for (i=0; ids[i].vendor != 0; i++)
 224                                         if (vendor == ids[i].vendor &&
 225                                             device == ids[i].device)
 226                                         {
 227                                                 if (index <= 0)
 228                                                         return bdf;
 229
 230                                                 index--;
 231                                         }
 232                         }
 233         }
 234
 235         return (-1);
 236 }
 237 #endif  /* CONFIG_IXP425 */
 238
 239 pci_dev_t pci_find_device(unsigned int vendor, unsigned int device, int index)
 240 {
 241         static struct pci_device_id ids[2] = {{}, {0, 0}};
 242
 243         ids[0].vendor = vendor;
 244         ids[0].device = device;
 245
 246         return pci_find_devices(ids, index);
 247 }
 248
 249 /*
 250  *
 251  */
 252
 253 int __pci_hose_phys_to_bus (struct pci_controller *hose,
 254                                 phys_addr_t phys_addr,
 255                                 unsigned long flags,
 256                                 unsigned long skip_mask,
 257                                 pci_addr_t *ba)
 258 {
 259         struct pci_region *res;
 260         pci_addr_t bus_addr;
 261         int i;
 262
 263         for (i = 0; i < hose->region_count; i++) {
 264                 res = &hose->regions[i];
 265
 266                 if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
 267                         continue;
 268
 269                 if (res->flags & skip_mask)
 270                         continue;
 271
 272                 bus_addr = phys_addr - res->phys_start + res->bus_start;
 273
 274                 if (bus_addr >= res->bus_start &&
 275                         bus_addr < res->bus_start + res->size) {
 276                         *ba = bus_addr;
 277                         return 0;
 278                 }
 279         }
 280
 281         return 1;
 282 }
 283
 284 pci_addr_t pci_hose_phys_to_bus (struct pci_controller *hose,
 285                                     phys_addr_t phys_addr,
 286                                     unsigned long flags)
 287 {
 288         pci_addr_t bus_addr = 0;
 289         int ret;
 290
 291         if (!hose) {
 292                 puts ("pci_hose_phys_to_bus: invalid hose\n");
 293                 return bus_addr;
 294         }
 295
 296         /* if PCI_REGION_MEM is set we do a two pass search with preference
 297          * on matches that don't have PCI_REGION_SYS_MEMORY set */
 298         if ((flags & PCI_REGION_MEM) == PCI_REGION_MEM) {
 299                 ret = __pci_hose_phys_to_bus(hose, phys_addr,
 300                                 flags, PCI_REGION_SYS_MEMORY, &bus_addr);
 301                 if (!ret)
 302                         return bus_addr;
 303         }
 304
 305         ret = __pci_hose_phys_to_bus(hose, phys_addr, flags, 0, &bus_addr);
 306
 307         if (ret)
 308                 puts ("pci_hose_phys_to_bus: invalid physical address\n");
 309
 310         return bus_addr;
 311 }
 312
 313 int __pci_hose_bus_to_phys (struct pci_controller *hose,
 314                                 pci_addr_t bus_addr,
 315                                 unsigned long flags,
 316                                 unsigned long skip_mask,
 317                                 phys_addr_t *pa)
 318 {
 319         struct pci_region *res;
 320         int i;
 321
 322         for (i = 0; i < hose->region_count; i++) {
 323                 res = &hose->regions[i];
 324
 325                 if (((res->flags ^ flags) & PCI_REGION_TYPE) != 0)
 326                         continue;
 327
 328                 if (res->flags & skip_mask)
 329                         continue;
 330
 331                 if (bus_addr >= res->bus_start &&
 332                         bus_addr < res->bus_start + res->size) {
 333                         *pa = (bus_addr - res->bus_start + res->phys_start);
 334                         return 0;
 335                 }
 336         }
 337
 338         return 1;
 339 }
 340
 341 phys_addr_t pci_hose_bus_to_phys(struct pci_controller* hose,
 342                                  pci_addr_t bus_addr,
 343                                  unsigned long flags)
 344 {
 345         phys_addr_t phys_addr = 0;
 346         int ret;
 347
 348         if (!hose) {
 349                 puts ("pci_hose_bus_to_phys: invalid hose\n");
 350                 return phys_addr;
 351         }
 352
 353         /* if PCI_REGION_MEM is set we do a two pass search with preference
 354          * on matches that don't have PCI_REGION_SYS_MEMORY set */
 355         if ((flags & PCI_REGION_MEM) == PCI_REGION_MEM) {
 356                 ret = __pci_hose_bus_to_phys(hose, bus_addr,
 357                                 flags, PCI_REGION_SYS_MEMORY, &phys_addr);
 358                 if (!ret)
 359                         return phys_addr;
 360         }
 361
 362         ret = __pci_hose_bus_to_phys(hose, bus_addr, flags, 0, &phys_addr);
 363
 364         if (ret)
 365                 puts ("pci_hose_bus_to_phys: invalid physical address\n");
 366
 367         return phys_addr;
 368 }
 369
 370 /*
 371  *
 372  */
 373
 374 int pci_hose_config_device(struct pci_controller *hose,
 375                            pci_dev_t dev,
 376                            unsigned long io,
 377                            pci_addr_t mem,
 378                            unsigned long command)
 379 {
 380         unsigned int bar_response, old_command;
 381         pci_addr_t bar_value;
 382         pci_size_t bar_size;
 383         unsigned char pin;
 384         int bar, found_mem64;
 385
 386         debug ("PCI Config: I/O=0x%lx, Memory=0x%llx, Command=0x%lx\n",
 387                 io, (u64)mem, command);
 388
 389         pci_hose_write_config_dword (hose, dev, PCI_COMMAND, 0);
 390
 391         for (bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_5; bar += 4) {
 392                 pci_hose_write_config_dword (hose, dev, bar, 0xffffffff);
 393                 pci_hose_read_config_dword (hose, dev, bar, &bar_response);
 394
 395                 if (!bar_response)
 396                         continue;
 397
 398                 found_mem64 = 0;
 399
 400                 /* Check the BAR type and set our address mask */
 401                 if (bar_response & PCI_BASE_ADDRESS_SPACE) {
 402                         bar_size = ~(bar_response & PCI_BASE_ADDRESS_IO_MASK) + 1;
 403                         /* round up region base address to a multiple of size */
 404                         io = ((io - 1) | (bar_size - 1)) + 1;
 405                         bar_value = io;
 406                         /* compute new region base address */
 407                         io = io + bar_size;
 408                 } else {
 409                         if ((bar_response & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
 410                                 PCI_BASE_ADDRESS_MEM_TYPE_64) {
 411                                 u32 bar_response_upper;
 412                                 u64 bar64;
 413                                 pci_hose_write_config_dword(hose, dev, bar+4, 0xffffffff);
 414                                 pci_hose_read_config_dword(hose, dev, bar+4, &bar_response_upper);
 415
 416                                 bar64 = ((u64)bar_response_upper << 32) | bar_response;
 417
 418                                 bar_size = ~(bar64 & PCI_BASE_ADDRESS_MEM_MASK) + 1;
 419                                 found_mem64 = 1;
 420                         } else {
 421                                 bar_size = (u32)(~(bar_response & PCI_BASE_ADDRESS_MEM_MASK) + 1);
 422                         }
 423
 424                         /* round up region base address to multiple of size */
 425                         mem = ((mem - 1) | (bar_size - 1)) + 1;
 426                         bar_value = mem;
 427                         /* compute new region base address */
 428                         mem = mem + bar_size;
 429                 }
 430
 431                 /* Write it out and update our limit */
 432                 pci_hose_write_config_dword (hose, dev, bar, (u32)bar_value);
 433
 434                 if (found_mem64) {
 435                         bar += 4;
 436 #ifdef CONFIG_SYS_PCI_64BIT
 437                         pci_hose_write_config_dword(hose, dev, bar, (u32)(bar_value>>32));
 438 #else
 439                         pci_hose_write_config_dword (hose, dev, bar, 0x00000000);
 440 #endif
 441                 }
 442         }
 443
 444         /* Configure Cache Line Size Register */
 445         pci_hose_write_config_byte (hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
 446
 447         /* Configure Latency Timer */
 448         pci_hose_write_config_byte (hose, dev, PCI_LATENCY_TIMER, 0x80);
 449
 450         /* Disable interrupt line, if device says it wants to use interrupts */
 451         pci_hose_read_config_byte (hose, dev, PCI_INTERRUPT_PIN, &pin);
 452         if (pin != 0) {
 453                 pci_hose_write_config_byte (hose, dev, PCI_INTERRUPT_LINE, 0xff);
 454         }
 455
 456         pci_hose_read_config_dword (hose, dev, PCI_COMMAND, &old_command);
 457         pci_hose_write_config_dword (hose, dev, PCI_COMMAND,
 458                                      (old_command & 0xffff0000) | command);
 459
 460         return 0;
 461 }
 462
 463 /*
 464  *
 465  */
 466
 467 struct pci_config_table *pci_find_config(struct pci_controller *hose,
 468                                          unsigned short class,
 469                                          unsigned int vendor,
 470                                          unsigned int device,
 471                                          unsigned int bus,
 472                                          unsigned int dev,
 473                                          unsigned int func)
 474 {
 475         struct pci_config_table *table;
 476
 477         for (table = hose->config_table; table && table->vendor; table++) {
 478                 if ((table->vendor == PCI_ANY_ID || table->vendor == vendor) &&
 479                     (table->device == PCI_ANY_ID || table->device == device) &&
 480                     (table->class  == PCI_ANY_ID || table->class  == class)  &&
 481                     (table->bus    == PCI_ANY_ID || table->bus    == bus)    &&
 482                     (table->dev    == PCI_ANY_ID || table->dev    == dev)    &&
 483                     (table->func   == PCI_ANY_ID || table->func   == func)) {
 484                         return table;
 485                 }
 486         }
 487
 488         return NULL;
 489 }
 490
 491 void pci_cfgfunc_config_device(struct pci_controller *hose,
 492                                pci_dev_t dev,
 493                                struct pci_config_table *entry)
 494 {
 495         pci_hose_config_device(hose, dev, entry->priv[0], entry->priv[1], entry->priv[2]);
 496 }
 497
 498 void pci_cfgfunc_do_nothing(struct pci_controller *hose,
 499                             pci_dev_t dev, struct pci_config_table *entry)
 500 {
 501 }
 502
 503 /*
 504  *
 505  */
 506
 507 /* HJF: Changed this to return int. I think this is required
 508  * to get the correct result when scanning bridges
 509  */
 510 extern int pciauto_config_device(struct pci_controller *hose, pci_dev_t dev);
 511 extern void pciauto_config_init(struct pci_controller *hose);
 512
 513 int __pci_skip_dev(struct pci_controller *hose, pci_dev_t dev)
 514 {
 515         /*
 516          * Check if pci device should be skipped in configuration
 517          */
 518         if (dev == PCI_BDF(hose->first_busno, 0, 0)) {
 519 #if defined(CONFIG_PCI_CONFIG_HOST_BRIDGE) /* don't skip host bridge */
 520                 /*
 521                  * Only skip configuration if "pciconfighost" is not set
 522                  */
 523                 if (getenv("pciconfighost") == NULL)
 524                         return 1;
 525 #else
 526                 return 1;
 527 #endif
 528         }
 529
 530         return 0;
 531 }
 532 int pci_skip_dev(struct pci_controller *hose, pci_dev_t dev)
 533         __attribute__((weak, alias("__pci_skip_dev")));
 534
 535 #ifdef CONFIG_PCI_SCAN_SHOW
 536 int __pci_print_dev(struct pci_controller *hose, pci_dev_t dev)
 537 {
 538         if (dev == PCI_BDF(hose->first_busno, 0, 0))
 539                 return 0;
 540
 541         return 1;
 542 }
 543 int pci_print_dev(struct pci_controller *hose, pci_dev_t dev)
 544         __attribute__((weak, alias("__pci_print_dev")));
 545 #endif /* CONFIG_PCI_SCAN_SHOW */
 546
 547 int pci_hose_scan_bus(struct pci_controller *hose, int bus)
 548 {
 549         unsigned int sub_bus, found_multi=0;
 550         unsigned short vendor, device, class;
 551         unsigned char header_type;
 552         struct pci_config_table *cfg;
 553         pci_dev_t dev;
 554
 555         sub_bus = bus;
 556
 557         for (dev =  PCI_BDF(bus,0,0);
 558              dev <  PCI_BDF(bus,PCI_MAX_PCI_DEVICES-1,PCI_MAX_PCI_FUNCTIONS-1);
 559              dev += PCI_BDF(0,0,1)) {
 560
 561                 if (pci_skip_dev(hose, dev))
 562                         continue;
 563
 564                 if (PCI_FUNC(dev) && !found_multi)
 565                         continue;
 566
 567                 pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type);
 568
 569                 pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);
 570
 571                 if (vendor != 0xffff && vendor != 0x0000) {
 572
 573                         if (!PCI_FUNC(dev))
 574                                 found_multi = header_type & 0x80;
 575
 576                         debug ("PCI Scan: Found Bus %d, Device %d, Function %d\n",
 577                                 PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev) );
 578
 579                         pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
 580                         pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 581
 582                         cfg = pci_find_config(hose, class, vendor, device,
 583                                               PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
 584                         if (cfg) {
 585                                 cfg->config_device(hose, dev, cfg);
 586                                 sub_bus = max(sub_bus, hose->current_busno);
 587 #ifdef CONFIG_PCI_PNP
 588                         } else {
 589                                 int n = pciauto_config_device(hose, dev);
 590
 591                                 sub_bus = max(sub_bus, n);
 592 #endif
 593                         }
 594                         if (hose->fixup_irq)
 595                                 hose->fixup_irq(hose, dev);
 596
 597 #ifdef CONFIG_PCI_SCAN_SHOW
 598                         if (pci_print_dev(hose, dev)) {
 599                                 unsigned char int_line;
 600
 601                                 pci_hose_read_config_byte(hose, dev, PCI_INTERRUPT_LINE,
 602                                                           &int_line);
 603                                 printf("        %02x  %02x  %04x  %04x  %04x  %02x\n",
 604                                        PCI_BUS(dev), PCI_DEV(dev), vendor, device, class,
 605                                        int_line);
 606                         }
 607 #endif
 608                 }
 609         }
 610
 611         return sub_bus;
 612 }
 613
 614 int pci_hose_scan(struct pci_controller *hose)
 615 {
 616         /* Start scan at current_busno.
 617          * PCIe will start scan at first_busno+1.
 618          */
 619         /* For legacy support, ensure current>=first */
 620         if (hose->first_busno > hose->current_busno)
 621                 hose->current_busno = hose->first_busno;
 622 #ifdef CONFIG_PCI_PNP
 623         pciauto_config_init(hose);
 624 #endif
 625         return pci_hose_scan_bus(hose, hose->current_busno);
 626 }
 627
 628 void pci_init(void)
 629 {
 630 #if defined(CONFIG_PCI_BOOTDELAY)
 631         char *s;
 632         int i;
 633
 634         /* wait "pcidelay" ms (if defined)... */
 635         s = getenv ("pcidelay");
 636         if (s) {
 637                 int val = simple_strtoul (s, NULL, 10);
 638                 for (i=0; i<val; i++)
 639                         udelay (1000);
 640         }
 641 #endif /* CONFIG_PCI_BOOTDELAY */
 642
 643         hose_head = NULL;
 644
 645         /* now call board specific pci_init()... */
 646         pci_init_board();
 647 }