drivers/gpu/drm/i915/intel_bios.c

   1 /*
   2  * Copyright © 2006 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27 #include "drmP.h"
  28 #include "drm.h"
  29 #include "i915_drm.h"
  30 #include "i915_drv.h"
  31 #include "intel_bios.h"
  32
  33 #define SLAVE_ADDR1     0x70
  34 #define SLAVE_ADDR2     0x72
  35
  36 static int panel_type;
  37
  38 static void *
  39 find_section(struct bdb_header *bdb, int section_id)
  40 {
  41         u8 *base = (u8 *)bdb;
  42         int index = 0;
  43         u16 total, current_size;
  44         u8 current_id;
  45
  46         /* skip to first section */
  47         index += bdb->header_size;
  48         total = bdb->bdb_size;
  49
  50         /* walk the sections looking for section_id */
  51         while (index < total) {
  52                 current_id = *(base + index);
  53                 index++;
  54                 current_size = *((u16 *)(base + index));
  55                 index += 2;
  56                 if (current_id == section_id)
  57                         return base + index;
  58                 index += current_size;
  59         }
  60
  61         return NULL;
  62 }
  63
  64 static u16
  65 get_blocksize(void *p)
  66 {
  67         u16 *block_ptr, block_size;
  68
  69         block_ptr = (u16 *)((char *)p - 2);
  70         block_size = *block_ptr;
  71         return block_size;
  72 }
  73
  74 static void
  75 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  76                         struct lvds_dvo_timing *dvo_timing)
  77 {
  78         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  79                 dvo_timing->hactive_lo;
  80         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  81                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  82         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  83                 dvo_timing->hsync_pulse_width;
  84         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  85                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  86
  87         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  88                 dvo_timing->vactive_lo;
  89         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  90                 dvo_timing->vsync_off;
  91         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  92                 dvo_timing->vsync_pulse_width;
  93         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  94                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  95         panel_fixed_mode->clock = dvo_timing->clock * 10;
  96         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  97
  98         if (dvo_timing->hsync_positive)
  99                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
 100         else
 101                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
 102
 103         if (dvo_timing->vsync_positive)
 104                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
 105         else
 106                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 107
 108         /* Some VBTs have bogus h/vtotal values */
 109         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 110                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 111         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 112                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 113
 114         drm_mode_set_name(panel_fixed_mode);
 115 }
 116
 117 /* Try to find integrated panel data */
 118 static void
 119 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
 120                             struct bdb_header *bdb)
 121 {
 122         struct bdb_lvds_options *lvds_options;
 123         struct bdb_lvds_lfp_data *lvds_lfp_data;
 124         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 125         struct bdb_lvds_lfp_data_entry *entry;
 126         struct lvds_dvo_timing *dvo_timing;
 127         struct drm_display_mode *panel_fixed_mode;
 128         int lfp_data_size, dvo_timing_offset;
 129         int i, temp_downclock;
 130         struct drm_display_mode *temp_mode;
 131
 132         /* Defaults if we can't find VBT info */
 133         dev_priv->lvds_dither = 0;
 134         dev_priv->lvds_vbt = 0;
 135
 136         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 137         if (!lvds_options)
 138                 return;
 139
 140         dev_priv->lvds_dither = lvds_options->pixel_dither;
 141         if (lvds_options->panel_type == 0xff)
 142                 return;
 143         panel_type = lvds_options->panel_type;
 144
 145         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 146         if (!lvds_lfp_data)
 147                 return;
 148
 149         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
 150         if (!lvds_lfp_data_ptrs)
 151                 return;
 152
 153         dev_priv->lvds_vbt = 1;
 154
 155         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
 156                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
 157         entry = (struct bdb_lvds_lfp_data_entry *)
 158                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
 159                                                    lvds_options->panel_type));
 160         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
 161                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
 162
 163         /*
 164          * the size of fp_timing varies on the different platform.
 165          * So calculate the DVO timing relative offset in LVDS data
 166          * entry to get the DVO timing entry
 167          */
 168         dvo_timing = (struct lvds_dvo_timing *)
 169                         ((unsigned char *)entry + dvo_timing_offset);
 170
 171         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 172         if (!panel_fixed_mode)
 173                 return;
 174
 175         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 176
 177         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 178
 179         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
 180         drm_mode_debug_printmodeline(panel_fixed_mode);
 181
 182         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
 183         temp_downclock = panel_fixed_mode->clock;
 184         /*
 185          * enumerate the LVDS panel timing info entry in VBT to check whether
 186          * the LVDS downclock is found.
 187          */
 188         for (i = 0; i < 16; i++) {
 189                 entry = (struct bdb_lvds_lfp_data_entry *)
 190                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
 191                 dvo_timing = (struct lvds_dvo_timing *)
 192                         ((unsigned char *)entry + dvo_timing_offset);
 193
 194                 fill_detail_timing_data(temp_mode, dvo_timing);
 195
 196                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
 197                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
 198                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
 199                 temp_mode->htotal == panel_fixed_mode->htotal &&
 200                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
 201                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
 202                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
 203                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
 204                 temp_mode->clock < temp_downclock) {
 205                         /*
 206                          * downclock is already found. But we expect
 207                          * to find the lower downclock.
 208                          */
 209                         temp_downclock = temp_mode->clock;
 210                 }
 211                 /* clear it to zero */
 212                 memset(temp_mode, 0, sizeof(*temp_mode));
 213         }
 214         kfree(temp_mode);
 215         if (temp_downclock < panel_fixed_mode->clock &&
 216             i915_lvds_downclock) {
 217                 dev_priv->lvds_downclock_avail = 1;
 218                 dev_priv->lvds_downclock = temp_downclock;
 219                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
 220                                 "Normal Clock %dKHz, downclock %dKHz\n",
 221                                 temp_downclock, panel_fixed_mode->clock);
 222         }
 223         return;
 224 }
 225
 226 /* Try to find sdvo panel data */
 227 static void
 228 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
 229                       struct bdb_header *bdb)
 230 {
 231         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 232         struct lvds_dvo_timing *dvo_timing;
 233         struct drm_display_mode *panel_fixed_mode;
 234
 235         dev_priv->sdvo_lvds_vbt_mode = NULL;
 236
 237         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 238         if (!sdvo_lvds_options)
 239                 return;
 240
 241         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 242         if (!dvo_timing)
 243                 return;
 244
 245         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 246
 247         if (!panel_fixed_mode)
 248                 return;
 249
 250         fill_detail_timing_data(panel_fixed_mode,
 251                         dvo_timing + sdvo_lvds_options->panel_type);
 252
 253         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 254
 255         return;
 256 }
 257
 258 static void
 259 parse_general_features(struct drm_i915_private *dev_priv,
 260                        struct bdb_header *bdb)
 261 {
 262         struct drm_device *dev = dev_priv->dev;
 263         struct bdb_general_features *general;
 264
 265         /* Set sensible defaults in case we can't find the general block */
 266         dev_priv->int_tv_support = 1;
 267         dev_priv->int_crt_support = 1;
 268
 269         general = find_section(bdb, BDB_GENERAL_FEATURES);
 270         if (general) {
 271                 dev_priv->int_tv_support = general->int_tv_support;
 272                 dev_priv->int_crt_support = general->int_crt_support;
 273                 dev_priv->lvds_use_ssc = general->enable_ssc;
 274
 275                 if (dev_priv->lvds_use_ssc) {
 276                         if (IS_I85X(dev_priv->dev))
 277                                 dev_priv->lvds_ssc_freq =
 278                                         general->ssc_freq ? 66 : 48;
 279                         else if (IS_IRONLAKE(dev_priv->dev) || IS_GEN6(dev))
 280                                 dev_priv->lvds_ssc_freq =
 281                                         general->ssc_freq ? 100 : 120;
 282                         else
 283                                 dev_priv->lvds_ssc_freq =
 284                                         general->ssc_freq ? 100 : 96;
 285                 }
 286         }
 287 }
 288
 289 static void
 290 parse_general_definitions(struct drm_i915_private *dev_priv,
 291                           struct bdb_header *bdb)
 292 {
 293         struct bdb_general_definitions *general;
 294
 295         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 296         if (general) {
 297                 u16 block_size = get_blocksize(general);
 298                 if (block_size >= sizeof(*general)) {
 299                         int bus_pin = general->crt_ddc_gmbus_pin;
 300                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
 301                         if (bus_pin >= 1 && bus_pin <= 6)
 302                                 dev_priv->crt_ddc_pin = bus_pin - 1;
 303                 } else {
 304                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
 305                                   block_size);
 306                 }
 307         }
 308 }
 309
 310 static void
 311 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
 312                           struct bdb_header *bdb)
 313 {
 314         struct sdvo_device_mapping *p_mapping;
 315         struct bdb_general_definitions *p_defs;
 316         struct child_device_config *p_child;
 317         int i, child_device_num, count;
 318         u16     block_size;
 319
 320         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 321         if (!p_defs) {
 322                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 323                 return;
 324         }
 325         /* judge whether the size of child device meets the requirements.
 326          * If the child device size obtained from general definition block
 327          * is different with sizeof(struct child_device_config), skip the
 328          * parsing of sdvo device info
 329          */
 330         if (p_defs->child_dev_size != sizeof(*p_child)) {
 331                 /* different child dev size . Ignore it */
 332                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 333                 return;
 334         }
 335         /* get the block size of general definitions */
 336         block_size = get_blocksize(p_defs);
 337         /* get the number of child device */
 338         child_device_num = (block_size - sizeof(*p_defs)) /
 339                                 sizeof(*p_child);
 340         count = 0;
 341         for (i = 0; i < child_device_num; i++) {
 342                 p_child = &(p_defs->devices[i]);
 343                 if (!p_child->device_type) {
 344                         /* skip the device block if device type is invalid */
 345                         continue;
 346                 }
 347                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 348                         p_child->slave_addr != SLAVE_ADDR2) {
 349                         /*
 350                          * If the slave address is neither 0x70 nor 0x72,
 351                          * it is not a SDVO device. Skip it.
 352                          */
 353                         continue;
 354                 }
 355                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 356                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 357                         /* skip the incorrect SDVO port */
 358                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
 359                         continue;
 360                 }
 361                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 362                                 " %s port\n",
 363                                 p_child->slave_addr,
 364                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 365                                         "SDVOB" : "SDVOC");
 366                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 367                 if (!p_mapping->initialized) {
 368                         p_mapping->dvo_port = p_child->dvo_port;
 369                         p_mapping->slave_addr = p_child->slave_addr;
 370                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 371                         p_mapping->ddc_pin = p_child->ddc_pin;
 372                         p_mapping->initialized = 1;
 373                 } else {
 374                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 375                                          "two SDVO device.\n");
 376                 }
 377                 if (p_child->slave2_addr) {
 378                         /* Maybe this is a SDVO device with multiple inputs */
 379                         /* And the mapping info is not added */
 380                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 381                                 " is a SDVO device with multiple inputs.\n");
 382                 }
 383                 count++;
 384         }
 385
 386         if (!count) {
 387                 /* No SDVO device info is found */
 388                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 389         }
 390         return;
 391 }
 392
 393 static void
 394 parse_driver_features(struct drm_i915_private *dev_priv,
 395                        struct bdb_header *bdb)
 396 {
 397         struct drm_device *dev = dev_priv->dev;
 398         struct bdb_driver_features *driver;
 399
 400         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 401         if (!driver)
 402                 return;
 403
 404         if (driver && SUPPORTS_EDP(dev) &&
 405             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
 406                 dev_priv->edp_support = 1;
 407         } else {
 408                 dev_priv->edp_support = 0;
 409         }
 410
 411         if (driver && driver->dual_frequency)
 412                 dev_priv->render_reclock_avail = true;
 413 }
 414
 415 static void
 416 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 417 {
 418         struct bdb_edp *edp;
 419
 420         edp = find_section(bdb, BDB_EDP);
 421         if (!edp) {
 422                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp_support) {
 423                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel "
 424                                       "supported, assume 18bpp panel color "
 425                                       "depth.\n");
 426                         dev_priv->edp_bpp = 18;
 427                 }
 428                 return;
 429         }
 430
 431         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
 432         case EDP_18BPP:
 433                 dev_priv->edp_bpp = 18;
 434                 break;
 435         case EDP_24BPP:
 436                 dev_priv->edp_bpp = 24;
 437                 break;
 438         case EDP_30BPP:
 439                 dev_priv->edp_bpp = 30;
 440                 break;
 441         }
 442 }
 443
 444 static void
 445 parse_device_mapping(struct drm_i915_private *dev_priv,
 446                        struct bdb_header *bdb)
 447 {
 448         struct bdb_general_definitions *p_defs;
 449         struct child_device_config *p_child, *child_dev_ptr;
 450         int i, child_device_num, count;
 451         u16     block_size;
 452
 453         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 454         if (!p_defs) {
 455                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 456                 return;
 457         }
 458         /* judge whether the size of child device meets the requirements.
 459          * If the child device size obtained from general definition block
 460          * is different with sizeof(struct child_device_config), skip the
 461          * parsing of sdvo device info
 462          */
 463         if (p_defs->child_dev_size != sizeof(*p_child)) {
 464                 /* different child dev size . Ignore it */
 465                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 466                 return;
 467         }
 468         /* get the block size of general definitions */
 469         block_size = get_blocksize(p_defs);
 470         /* get the number of child device */
 471         child_device_num = (block_size - sizeof(*p_defs)) /
 472                                 sizeof(*p_child);
 473         count = 0;
 474         /* get the number of child device that is present */
 475         for (i = 0; i < child_device_num; i++) {
 476                 p_child = &(p_defs->devices[i]);
 477                 if (!p_child->device_type) {
 478                         /* skip the device block if device type is invalid */
 479                         continue;
 480                 }
 481                 count++;
 482         }
 483         if (!count) {
 484                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
 485                 return;
 486         }
 487         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
 488         if (!dev_priv->child_dev) {
 489                 DRM_DEBUG_KMS("No memory space for child device\n");
 490                 return;
 491         }
 492
 493         dev_priv->child_dev_num = count;
 494         count = 0;
 495         for (i = 0; i < child_device_num; i++) {
 496                 p_child = &(p_defs->devices[i]);
 497                 if (!p_child->device_type) {
 498                         /* skip the device block if device type is invalid */
 499                         continue;
 500                 }
 501                 child_dev_ptr = dev_priv->child_dev + count;
 502                 count++;
 503                 memcpy((void *)child_dev_ptr, (void *)p_child,
 504                                         sizeof(*p_child));
 505         }
 506         return;
 507 }
 508
 509 /**
 510  * intel_init_bios - initialize VBIOS settings & find VBT
 511  * @dev: DRM device
 512  *
 513  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 514  * to appropriate values.
 515  *
 516  * Returns 0 on success, nonzero on failure.
 517  */
 518 bool
 519 intel_init_bios(struct drm_device *dev)
 520 {
 521         struct drm_i915_private *dev_priv = dev->dev_private;
 522         struct pci_dev *pdev = dev->pdev;
 523         struct bdb_header *bdb = NULL;
 524         u8 __iomem *bios = NULL;
 525
 526         dev_priv->crt_ddc_pin = GMBUS_PORT_VGADDC;
 527
 528         /* XXX Should this validation be moved to intel_opregion.c? */
 529         if (dev_priv->opregion.vbt) {
 530                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 531                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 532                         DRM_DEBUG_DRIVER("Using VBT from OpRegion: %20s\n",
 533                                          vbt->signature);
 534                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 535                 } else
 536                         dev_priv->opregion.vbt = NULL;
 537         }
 538
 539         if (bdb == NULL) {
 540                 struct vbt_header *vbt = NULL;
 541                 size_t size;
 542                 int i;
 543
 544                 bios = pci_map_rom(pdev, &size);
 545                 if (!bios)
 546                         return -1;
 547
 548                 /* Scour memory looking for the VBT signature */
 549                 for (i = 0; i + 4 < size; i++) {
 550                         if (!memcmp(bios + i, "$VBT", 4)) {
 551                                 vbt = (struct vbt_header *)(bios + i);
 552                                 break;
 553                         }
 554                 }
 555
 556                 if (!vbt) {
 557                         DRM_ERROR("VBT signature missing\n");
 558                         pci_unmap_rom(pdev, bios);
 559                         return -1;
 560                 }
 561
 562                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 563         }
 564
 565         /* Grab useful general definitions */
 566         parse_general_features(dev_priv, bdb);
 567         parse_general_definitions(dev_priv, bdb);
 568         parse_lfp_panel_data(dev_priv, bdb);
 569         parse_sdvo_panel_data(dev_priv, bdb);
 570         parse_sdvo_device_mapping(dev_priv, bdb);
 571         parse_device_mapping(dev_priv, bdb);
 572         parse_driver_features(dev_priv, bdb);
 573         parse_edp(dev_priv, bdb);
 574
 575         if (bios)
 576                 pci_unmap_rom(pdev, bios);
 577
 578         return 0;
 579 }