arch/x86/kernel/early-quirks.c

   1 /* Various workarounds for chipset bugs.
   2    This code runs very early and can't use the regular PCI subsystem
   3    The entries are keyed to PCI bridges which usually identify chipsets
   4    uniquely.
   5    This is only for whole classes of chipsets with specific problems which
   6    need early invasive action (e.g. before the timers are initialized).
   7    Most PCI device specific workarounds can be done later and should be
   8    in standard PCI quirks
   9    Mainboard specific bugs should be handled by DMI entries.
  10    CPU specific bugs in setup.c */
  11
  12 #include <linux/pci.h>
  13 #include <linux/acpi.h>
  14 #include <linux/delay.h>
  15 #include <linux/dmi.h>
  16 #include <linux/pci_ids.h>
  17 #include <linux/bcma/bcma.h>
  18 #include <linux/bcma/bcma_regs.h>
  19 #include <drm/i915_drm.h>
  20 #include <asm/pci-direct.h>
  21 #include <asm/dma.h>
  22 #include <asm/io_apic.h>
  23 #include <asm/apic.h>
  24 #include <asm/hpet.h>
  25 #include <asm/iommu.h>
  26 #include <asm/gart.h>
  27 #include <asm/irq_remapping.h>
  28 #include <asm/early_ioremap.h>
  29
  30 #define dev_err(msg)  pr_err("pci 0000:%02x:%02x.%d: %s", bus, slot, func, msg)
  31
  32 static void __init fix_hypertransport_config(int num, int slot, int func)
  33 {
  34         u32 htcfg;
  35         /*
  36          * we found a hypertransport bus
  37          * make sure that we are broadcasting
  38          * interrupts to all cpus on the ht bus
  39          * if we're using extended apic ids
  40          */
  41         htcfg = read_pci_config(num, slot, func, 0x68);
  42         if (htcfg & (1 << 18)) {
  43                 printk(KERN_INFO "Detected use of extended apic ids "
  44                                  "on hypertransport bus\n");
  45                 if ((htcfg & (1 << 17)) == 0) {
  46                         printk(KERN_INFO "Enabling hypertransport extended "
  47                                          "apic interrupt broadcast\n");
  48                         printk(KERN_INFO "Note this is a bios bug, "
  49                                          "please contact your hw vendor\n");
  50                         htcfg |= (1 << 17);
  51                         write_pci_config(num, slot, func, 0x68, htcfg);
  52                 }
  53         }
  54
  55
  56 }
  57
  58 static void __init via_bugs(int  num, int slot, int func)
  59 {
  60 #ifdef CONFIG_GART_IOMMU
  61         if ((max_pfn > MAX_DMA32_PFN ||  force_iommu) &&
  62             !gart_iommu_aperture_allowed) {
  63                 printk(KERN_INFO
  64                        "Looks like a VIA chipset. Disabling IOMMU."
  65                        " Override with iommu=allowed\n");
  66                 gart_iommu_aperture_disabled = 1;
  67         }
  68 #endif
  69 }
  70
  71 #ifdef CONFIG_ACPI
  72 #ifdef CONFIG_X86_IO_APIC
  73
  74 static int __init nvidia_hpet_check(struct acpi_table_header *header)
  75 {
  76         return 0;
  77 }
  78 #endif /* CONFIG_X86_IO_APIC */
  79 #endif /* CONFIG_ACPI */
  80
  81 static void __init nvidia_bugs(int num, int slot, int func)
  82 {
  83 #ifdef CONFIG_ACPI
  84 #ifdef CONFIG_X86_IO_APIC
  85         /*
  86          * Only applies to Nvidia root ports (bus 0) and not to
  87          * Nvidia graphics cards with PCI ports on secondary buses.
  88          */
  89         if (num)
  90                 return;
  91
  92         /*
  93          * All timer overrides on Nvidia are
  94          * wrong unless HPET is enabled.
  95          * Unfortunately that's not true on many Asus boards.
  96          * We don't know yet how to detect this automatically, but
  97          * at least allow a command line override.
  98          */
  99         if (acpi_use_timer_override)
 100                 return;
 101
 102         if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
 103                 acpi_skip_timer_override = 1;
 104                 printk(KERN_INFO "Nvidia board "
 105                        "detected. Ignoring ACPI "
 106                        "timer override.\n");
 107                 printk(KERN_INFO "If you got timer trouble "
 108                         "try acpi_use_timer_override\n");
 109         }
 110 #endif
 111 #endif
 112         /* RED-PEN skip them on mptables too? */
 113
 114 }
 115
 116 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
 117 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
 118 {
 119         u32 d;
 120         u8  b;
 121
 122         b = read_pci_config_byte(num, slot, func, 0xac);
 123         b &= ~(1<<5);
 124         write_pci_config_byte(num, slot, func, 0xac, b);
 125
 126         d = read_pci_config(num, slot, func, 0x70);
 127         d |= 1<<8;
 128         write_pci_config(num, slot, func, 0x70, d);
 129
 130         d = read_pci_config(num, slot, func, 0x8);
 131         d &= 0xff;
 132         return d;
 133 }
 134
 135 static void __init ati_bugs(int num, int slot, int func)
 136 {
 137         u32 d;
 138         u8  b;
 139
 140         if (acpi_use_timer_override)
 141                 return;
 142
 143         d = ati_ixp4x0_rev(num, slot, func);
 144         if (d  < 0x82)
 145                 acpi_skip_timer_override = 1;
 146         else {
 147                 /* check for IRQ0 interrupt swap */
 148                 outb(0x72, 0xcd6); b = inb(0xcd7);
 149                 if (!(b & 0x2))
 150                         acpi_skip_timer_override = 1;
 151         }
 152
 153         if (acpi_skip_timer_override) {
 154                 printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
 155                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 156                 printk(KERN_INFO "If you got timer trouble "
 157                        "try acpi_use_timer_override\n");
 158         }
 159 }
 160
 161 static u32 __init ati_sbx00_rev(int num, int slot, int func)
 162 {
 163         u32 d;
 164
 165         d = read_pci_config(num, slot, func, 0x8);
 166         d &= 0xff;
 167
 168         return d;
 169 }
 170
 171 static void __init ati_bugs_contd(int num, int slot, int func)
 172 {
 173         u32 d, rev;
 174
 175         rev = ati_sbx00_rev(num, slot, func);
 176         if (rev >= 0x40)
 177                 acpi_fix_pin2_polarity = 1;
 178
 179         /*
 180          * SB600: revisions 0x11, 0x12, 0x13, 0x14, ...
 181          * SB700: revisions 0x39, 0x3a, ...
 182          * SB800: revisions 0x40, 0x41, ...
 183          */
 184         if (rev >= 0x39)
 185                 return;
 186
 187         if (acpi_use_timer_override)
 188                 return;
 189
 190         /* check for IRQ0 interrupt swap */
 191         d = read_pci_config(num, slot, func, 0x64);
 192         if (!(d & (1<<14)))
 193                 acpi_skip_timer_override = 1;
 194
 195         if (acpi_skip_timer_override) {
 196                 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
 197                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 198                 printk(KERN_INFO "If you got timer trouble "
 199                        "try acpi_use_timer_override\n");
 200         }
 201 }
 202 #else
 203 static void __init ati_bugs(int num, int slot, int func)
 204 {
 205 }
 206
 207 static void __init ati_bugs_contd(int num, int slot, int func)
 208 {
 209 }
 210 #endif
 211
 212 static void __init intel_remapping_check(int num, int slot, int func)
 213 {
 214         u8 revision;
 215         u16 device;
 216
 217         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 218         revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID);
 219
 220         /*
 221          * Revision <= 13 of all triggering devices id in this quirk
 222          * have a problem draining interrupts when irq remapping is
 223          * enabled, and should be flagged as broken. Additionally
 224          * revision 0x22 of device id 0x3405 has this problem.
 225          */
 226         if (revision <= 0x13)
 227                 set_irq_remapping_broken();
 228         else if (device == 0x3405 && revision == 0x22)
 229                 set_irq_remapping_broken();
 230 }
 231
 232 /*
 233  * Systems with Intel graphics controllers set aside memory exclusively
 234  * for gfx driver use.  This memory is not marked in the E820 as reserved
 235  * or as RAM, and so is subject to overlap from E820 manipulation later
 236  * in the boot process.  On some systems, MMIO space is allocated on top,
 237  * despite the efforts of the "RAM buffer" approach, which simply rounds
 238  * memory boundaries up to 64M to try to catch space that may decode
 239  * as RAM and so is not suitable for MMIO.
 240  */
 241
 242 #define KB(x)   ((x) * 1024UL)
 243 #define MB(x)   (KB (KB (x)))
 244
 245 static size_t __init i830_tseg_size(void)
 246 {
 247         u8 esmramc = read_pci_config_byte(0, 0, 0, I830_ESMRAMC);
 248
 249         if (!(esmramc & TSEG_ENABLE))
 250                 return 0;
 251
 252         if (esmramc & I830_TSEG_SIZE_1M)
 253                 return MB(1);
 254         else
 255                 return KB(512);
 256 }
 257
 258 static size_t __init i845_tseg_size(void)
 259 {
 260         u8 esmramc = read_pci_config_byte(0, 0, 0, I845_ESMRAMC);
 261         u8 tseg_size = esmramc & I845_TSEG_SIZE_MASK;
 262
 263         if (!(esmramc & TSEG_ENABLE))
 264                 return 0;
 265
 266         switch (tseg_size) {
 267         case I845_TSEG_SIZE_512K:       return KB(512);
 268         case I845_TSEG_SIZE_1M:         return MB(1);
 269         default:
 270                 WARN(1, "Unknown ESMRAMC value: %x!\n", esmramc);
 271         }
 272         return 0;
 273 }
 274
 275 static size_t __init i85x_tseg_size(void)
 276 {
 277         u8 esmramc = read_pci_config_byte(0, 0, 0, I85X_ESMRAMC);
 278
 279         if (!(esmramc & TSEG_ENABLE))
 280                 return 0;
 281
 282         return MB(1);
 283 }
 284
 285 static size_t __init i830_mem_size(void)
 286 {
 287         return read_pci_config_byte(0, 0, 0, I830_DRB3) * MB(32);
 288 }
 289
 290 static size_t __init i85x_mem_size(void)
 291 {
 292         return read_pci_config_byte(0, 0, 1, I85X_DRB3) * MB(32);
 293 }
 294
 295 /*
 296  * On 830/845/85x the stolen memory base isn't available in any
 297  * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 298  */
 299 static phys_addr_t __init i830_stolen_base(int num, int slot, int func,
 300                                            size_t stolen_size)
 301 {
 302         return (phys_addr_t)i830_mem_size() - i830_tseg_size() - stolen_size;
 303 }
 304
 305 static phys_addr_t __init i845_stolen_base(int num, int slot, int func,
 306                                            size_t stolen_size)
 307 {
 308         return (phys_addr_t)i830_mem_size() - i845_tseg_size() - stolen_size;
 309 }
 310
 311 static phys_addr_t __init i85x_stolen_base(int num, int slot, int func,
 312                                            size_t stolen_size)
 313 {
 314         return (phys_addr_t)i85x_mem_size() - i85x_tseg_size() - stolen_size;
 315 }
 316
 317 static phys_addr_t __init i865_stolen_base(int num, int slot, int func,
 318                                            size_t stolen_size)
 319 {
 320         u16 toud;
 321
 322         /*
 323          * FIXME is the graphics stolen memory region
 324          * always at TOUD? Ie. is it always the last
 325          * one to be allocated by the BIOS?
 326          */
 327         toud = read_pci_config_16(0, 0, 0, I865_TOUD);
 328
 329         return (phys_addr_t)toud << 16;
 330 }
 331
 332 static phys_addr_t __init gen3_stolen_base(int num, int slot, int func,
 333                                            size_t stolen_size)
 334 {
 335         u32 bsm;
 336
 337         /* Almost universally we can find the Graphics Base of Stolen Memory
 338          * at register BSM (0x5c) in the igfx configuration space. On a few
 339          * (desktop) machines this is also mirrored in the bridge device at
 340          * different locations, or in the MCHBAR.
 341          */
 342         bsm = read_pci_config(num, slot, func, INTEL_BSM);
 343
 344         return (phys_addr_t)bsm & INTEL_BSM_MASK;
 345 }
 346
 347 static size_t __init i830_stolen_size(int num, int slot, int func)
 348 {
 349         u16 gmch_ctrl;
 350         u16 gms;
 351
 352         gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
 353         gms = gmch_ctrl & I830_GMCH_GMS_MASK;
 354
 355         switch (gms) {
 356         case I830_GMCH_GMS_STOLEN_512:  return KB(512);
 357         case I830_GMCH_GMS_STOLEN_1024: return MB(1);
 358         case I830_GMCH_GMS_STOLEN_8192: return MB(8);
 359         /* local memory isn't part of the normal address space */
 360         case I830_GMCH_GMS_LOCAL:       return 0;
 361         default:
 362                 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
 363         }
 364
 365         return 0;
 366 }
 367
 368 static size_t __init gen3_stolen_size(int num, int slot, int func)
 369 {
 370         u16 gmch_ctrl;
 371         u16 gms;
 372
 373         gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
 374         gms = gmch_ctrl & I855_GMCH_GMS_MASK;
 375
 376         switch (gms) {
 377         case I855_GMCH_GMS_STOLEN_1M:   return MB(1);
 378         case I855_GMCH_GMS_STOLEN_4M:   return MB(4);
 379         case I855_GMCH_GMS_STOLEN_8M:   return MB(8);
 380         case I855_GMCH_GMS_STOLEN_16M:  return MB(16);
 381         case I855_GMCH_GMS_STOLEN_32M:  return MB(32);
 382         case I915_GMCH_GMS_STOLEN_48M:  return MB(48);
 383         case I915_GMCH_GMS_STOLEN_64M:  return MB(64);
 384         case G33_GMCH_GMS_STOLEN_128M:  return MB(128);
 385         case G33_GMCH_GMS_STOLEN_256M:  return MB(256);
 386         case INTEL_GMCH_GMS_STOLEN_96M: return MB(96);
 387         case INTEL_GMCH_GMS_STOLEN_160M:return MB(160);
 388         case INTEL_GMCH_GMS_STOLEN_224M:return MB(224);
 389         case INTEL_GMCH_GMS_STOLEN_352M:return MB(352);
 390         default:
 391                 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
 392         }
 393
 394         return 0;
 395 }
 396
 397 static size_t __init gen6_stolen_size(int num, int slot, int func)
 398 {
 399         u16 gmch_ctrl;
 400         u16 gms;
 401
 402         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 403         gms = (gmch_ctrl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
 404
 405         return (size_t)gms * MB(32);
 406 }
 407
 408 static size_t __init gen8_stolen_size(int num, int slot, int func)
 409 {
 410         u16 gmch_ctrl;
 411         u16 gms;
 412
 413         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 414         gms = (gmch_ctrl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
 415
 416         return (size_t)gms * MB(32);
 417 }
 418
 419 static size_t __init chv_stolen_size(int num, int slot, int func)
 420 {
 421         u16 gmch_ctrl;
 422         u16 gms;
 423
 424         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 425         gms = (gmch_ctrl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
 426
 427         /*
 428          * 0x0  to 0x10: 32MB increments starting at 0MB
 429          * 0x11 to 0x16: 4MB increments starting at 8MB
 430          * 0x17 to 0x1d: 4MB increments start at 36MB
 431          */
 432         if (gms < 0x11)
 433                 return (size_t)gms * MB(32);
 434         else if (gms < 0x17)
 435                 return (size_t)(gms - 0x11 + 2) * MB(4);
 436         else
 437                 return (size_t)(gms - 0x17 + 9) * MB(4);
 438 }
 439
 440 static size_t __init gen9_stolen_size(int num, int slot, int func)
 441 {
 442         u16 gmch_ctrl;
 443         u16 gms;
 444
 445         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 446         gms = (gmch_ctrl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
 447
 448         /* 0x0  to 0xef: 32MB increments starting at 0MB */
 449         /* 0xf0 to 0xfe: 4MB increments starting at 4MB */
 450         if (gms < 0xf0)
 451                 return (size_t)gms * MB(32);
 452         else
 453                 return (size_t)(gms - 0xf0 + 1) * MB(4);
 454 }
 455
 456 struct intel_early_ops {
 457         size_t (*stolen_size)(int num, int slot, int func);
 458         phys_addr_t (*stolen_base)(int num, int slot, int func, size_t size);
 459 };
 460
 461 static const struct intel_early_ops i830_early_ops __initconst = {
 462         .stolen_base = i830_stolen_base,
 463         .stolen_size = i830_stolen_size,
 464 };
 465
 466 static const struct intel_early_ops i845_early_ops __initconst = {
 467         .stolen_base = i845_stolen_base,
 468         .stolen_size = i830_stolen_size,
 469 };
 470
 471 static const struct intel_early_ops i85x_early_ops __initconst = {
 472         .stolen_base = i85x_stolen_base,
 473         .stolen_size = gen3_stolen_size,
 474 };
 475
 476 static const struct intel_early_ops i865_early_ops __initconst = {
 477         .stolen_base = i865_stolen_base,
 478         .stolen_size = gen3_stolen_size,
 479 };
 480
 481 static const struct intel_early_ops gen3_early_ops __initconst = {
 482         .stolen_base = gen3_stolen_base,
 483         .stolen_size = gen3_stolen_size,
 484 };
 485
 486 static const struct intel_early_ops gen6_early_ops __initconst = {
 487         .stolen_base = gen3_stolen_base,
 488         .stolen_size = gen6_stolen_size,
 489 };
 490
 491 static const struct intel_early_ops gen8_early_ops __initconst = {
 492         .stolen_base = gen3_stolen_base,
 493         .stolen_size = gen8_stolen_size,
 494 };
 495
 496 static const struct intel_early_ops gen9_early_ops __initconst = {
 497         .stolen_base = gen3_stolen_base,
 498         .stolen_size = gen9_stolen_size,
 499 };
 500
 501 static const struct intel_early_ops chv_early_ops __initconst = {
 502         .stolen_base = gen3_stolen_base,
 503         .stolen_size = chv_stolen_size,
 504 };
 505
 506 static const struct pci_device_id intel_early_ids[] __initconst = {
 507         INTEL_I830_IDS(&i830_early_ops),
 508         INTEL_I845G_IDS(&i845_early_ops),
 509         INTEL_I85X_IDS(&i85x_early_ops),
 510         INTEL_I865G_IDS(&i865_early_ops),
 511         INTEL_I915G_IDS(&gen3_early_ops),
 512         INTEL_I915GM_IDS(&gen3_early_ops),
 513         INTEL_I945G_IDS(&gen3_early_ops),
 514         INTEL_I945GM_IDS(&gen3_early_ops),
 515         INTEL_VLV_M_IDS(&gen6_early_ops),
 516         INTEL_VLV_D_IDS(&gen6_early_ops),
 517         INTEL_PINEVIEW_IDS(&gen3_early_ops),
 518         INTEL_I965G_IDS(&gen3_early_ops),
 519         INTEL_G33_IDS(&gen3_early_ops),
 520         INTEL_I965GM_IDS(&gen3_early_ops),
 521         INTEL_GM45_IDS(&gen3_early_ops),
 522         INTEL_G45_IDS(&gen3_early_ops),
 523         INTEL_IRONLAKE_D_IDS(&gen3_early_ops),
 524         INTEL_IRONLAKE_M_IDS(&gen3_early_ops),
 525         INTEL_SNB_D_IDS(&gen6_early_ops),
 526         INTEL_SNB_M_IDS(&gen6_early_ops),
 527         INTEL_IVB_M_IDS(&gen6_early_ops),
 528         INTEL_IVB_D_IDS(&gen6_early_ops),
 529         INTEL_HSW_D_IDS(&gen6_early_ops),
 530         INTEL_HSW_M_IDS(&gen6_early_ops),
 531         INTEL_BDW_M_IDS(&gen8_early_ops),
 532         INTEL_BDW_D_IDS(&gen8_early_ops),
 533         INTEL_CHV_IDS(&chv_early_ops),
 534         INTEL_SKL_IDS(&gen9_early_ops),
 535         INTEL_BXT_IDS(&gen9_early_ops),
 536         INTEL_KBL_IDS(&gen9_early_ops),
 537 };
 538
 539 static void __init
 540 intel_graphics_stolen(int num, int slot, int func,
 541                       const struct intel_early_ops *early_ops)
 542 {
 543         phys_addr_t base, end;
 544         size_t size;
 545
 546         size = early_ops->stolen_size(num, slot, func);
 547         base = early_ops->stolen_base(num, slot, func, size);
 548
 549         if (!size || !base)
 550                 return;
 551
 552         end = base + size - 1;
 553         printk(KERN_INFO "Reserving Intel graphics memory at %pa-%pa\n",
 554                &base, &end);
 555
 556         /* Mark this space as reserved */
 557         e820_add_region(base, size, E820_RESERVED);
 558         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 559 }
 560
 561 static void __init intel_graphics_quirks(int num, int slot, int func)
 562 {
 563         const struct intel_early_ops *early_ops;
 564         u16 device;
 565         int i;
 566
 567         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 568
 569         for (i = 0; i < ARRAY_SIZE(intel_early_ids); i++) {
 570                 kernel_ulong_t driver_data = intel_early_ids[i].driver_data;
 571
 572                 if (intel_early_ids[i].device != device)
 573                         continue;
 574
 575                 early_ops = (typeof(early_ops))driver_data;
 576
 577                 intel_graphics_stolen(num, slot, func, early_ops);
 578
 579                 return;
 580         }
 581 }
 582
 583 static void __init force_disable_hpet(int num, int slot, int func)
 584 {
 585 #ifdef CONFIG_HPET_TIMER
 586         boot_hpet_disable = true;
 587         pr_info("x86/hpet: Will disable the HPET for this platform because it's not reliable\n");
 588 #endif
 589 }
 590
 591 #define BCM4331_MMIO_SIZE       16384
 592 #define BCM4331_PM_CAP          0x40
 593 #define bcma_aread32(reg)       ioread32(mmio + 1 * BCMA_CORE_SIZE + reg)
 594 #define bcma_awrite32(reg, val) iowrite32(val, mmio + 1 * BCMA_CORE_SIZE + reg)
 595
 596 static void __init apple_airport_reset(int bus, int slot, int func)
 597 {
 598         void __iomem *mmio;
 599         u16 pmcsr;
 600         u64 addr;
 601         int i;
 602
 603         if (!dmi_match(DMI_SYS_VENDOR, "Apple Inc."))
 604                 return;
 605
 606         /* Card may have been put into PCI_D3hot by grub quirk */
 607         pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
 608
 609         if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
 610                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
 611                 write_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL, pmcsr);
 612                 mdelay(10);
 613
 614                 pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
 615                 if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
 616                         dev_err("Cannot power up Apple AirPort card\n");
 617                         return;
 618                 }
 619         }
 620
 621         addr  =      read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
 622         addr |= (u64)read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_1) << 32;
 623         addr &= PCI_BASE_ADDRESS_MEM_MASK;
 624
 625         mmio = early_ioremap(addr, BCM4331_MMIO_SIZE);
 626         if (!mmio) {
 627                 dev_err("Cannot iomap Apple AirPort card\n");
 628                 return;
 629         }
 630
 631         pr_info("Resetting Apple AirPort card (left enabled by EFI)\n");
 632
 633         for (i = 0; bcma_aread32(BCMA_RESET_ST) && i < 30; i++)
 634                 udelay(10);
 635
 636         bcma_awrite32(BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
 637         bcma_aread32(BCMA_RESET_CTL);
 638         udelay(1);
 639
 640         bcma_awrite32(BCMA_RESET_CTL, 0);
 641         bcma_aread32(BCMA_RESET_CTL);
 642         udelay(10);
 643
 644         early_iounmap(mmio, BCM4331_MMIO_SIZE);
 645 }
 646
 647 #define QFLAG_APPLY_ONCE        0x1
 648 #define QFLAG_APPLIED           0x2
 649 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
 650 struct chipset {
 651         u32 vendor;
 652         u32 device;
 653         u32 class;
 654         u32 class_mask;
 655         u32 flags;
 656         void (*f)(int num, int slot, int func);
 657 };
 658
 659 static struct chipset early_qrk[] __initdata = {
 660         { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 661           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
 662         { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 663           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
 664         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
 665           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
 666         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
 667           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
 668         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
 669           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
 670         { PCI_VENDOR_ID_INTEL, 0x3403, PCI_CLASS_BRIDGE_HOST,
 671           PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
 672         { PCI_VENDOR_ID_INTEL, 0x3405, PCI_CLASS_BRIDGE_HOST,
 673           PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
 674         { PCI_VENDOR_ID_INTEL, 0x3406, PCI_CLASS_BRIDGE_HOST,
 675           PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
 676         { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, PCI_ANY_ID,
 677           QFLAG_APPLY_ONCE, intel_graphics_quirks },
 678         /*
 679          * HPET on the current version of the Baytrail platform has accuracy
 680          * problems: it will halt in deep idle state - so we disable it.
 681          *
 682          * More details can be found in section 18.10.1.3 of the datasheet:
 683          *
 684          *    http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/atom-z8000-datasheet-vol-1.pdf
 685          */
 686         { PCI_VENDOR_ID_INTEL, 0x0f00,
 687                 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
 688         { PCI_VENDOR_ID_BROADCOM, 0x4331,
 689           PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset},
 690         {}
 691 };
 692
 693 static void __init early_pci_scan_bus(int bus);
 694
 695 /**
 696  * check_dev_quirk - apply early quirks to a given PCI device
 697  * @num: bus number
 698  * @slot: slot number
 699  * @func: PCI function
 700  *
 701  * Check the vendor & device ID against the early quirks table.
 702  *
 703  * If the device is single function, let early_pci_scan_bus() know so we don't
 704  * poke at this device again.
 705  */
 706 static int __init check_dev_quirk(int num, int slot, int func)
 707 {
 708         u16 class;
 709         u16 vendor;
 710         u16 device;
 711         u8 type;
 712         u8 sec;
 713         int i;
 714
 715         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 716
 717         if (class == 0xffff)
 718                 return -1; /* no class, treat as single function */
 719
 720         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 721
 722         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 723
 724         for (i = 0; early_qrk[i].f != NULL; i++) {
 725                 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
 726                         (early_qrk[i].vendor == vendor)) &&
 727                         ((early_qrk[i].device == PCI_ANY_ID) ||
 728                         (early_qrk[i].device == device)) &&
 729                         (!((early_qrk[i].class ^ class) &
 730                             early_qrk[i].class_mask))) {
 731                                 if ((early_qrk[i].flags &
 732                                      QFLAG_DONE) != QFLAG_DONE)
 733                                         early_qrk[i].f(num, slot, func);
 734                                 early_qrk[i].flags |= QFLAG_APPLIED;
 735                         }
 736         }
 737
 738         type = read_pci_config_byte(num, slot, func,
 739                                     PCI_HEADER_TYPE);
 740
 741         if ((type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
 742                 sec = read_pci_config_byte(num, slot, func, PCI_SECONDARY_BUS);
 743                 if (sec > num)
 744                         early_pci_scan_bus(sec);
 745         }
 746
 747         if (!(type & 0x80))
 748                 return -1;
 749
 750         return 0;
 751 }
 752
 753 static void __init early_pci_scan_bus(int bus)
 754 {
 755         int slot, func;
 756
 757         /* Poor man's PCI discovery */
 758         for (slot = 0; slot < 32; slot++)
 759                 for (func = 0; func < 8; func++) {
 760                         /* Only probe function 0 on single fn devices */
 761                         if (check_dev_quirk(bus, slot, func))
 762                                 break;
 763                 }
 764 }
 765
 766 void __init early_quirks(void)
 767 {
 768         if (!early_pci_allowed())
 769                 return;
 770
 771         early_pci_scan_bus(0);
 772 }