root/arch/x86/kernel/early-quirks.c

DEFINITIONS

1. fix_hypertransport_config
2. via_bugs
3. nvidia_hpet_check
4. nvidia_bugs
5. ati_ixp4x0_rev
6. ati_bugs
7. ati_sbx00_rev
8. ati_bugs_contd
9. ati_bugs
10. ati_bugs_contd
11. intel_remapping_check
12. i830_tseg_size
13. i845_tseg_size
14. i85x_tseg_size
15. i830_mem_size
16. i85x_mem_size
17. i830_stolen_base
18. i845_stolen_base
19. i85x_stolen_base
20. i865_stolen_base
21. gen3_stolen_base
22. gen11_stolen_base
23. i830_stolen_size
24. gen3_stolen_size
25. gen6_stolen_size
26. gen8_stolen_size
27. chv_stolen_size
28. gen9_stolen_size
29. intel_graphics_stolen
30. intel_graphics_quirks
31. force_disable_hpet
32. apple_airport_reset
33. check_dev_quirk
34. early_pci_scan_bus
35. early_quirks

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Various workarounds for chipset bugs.
   3    This code runs very early and can't use the regular PCI subsystem
   4    The entries are keyed to PCI bridges which usually identify chipsets
   5    uniquely.
   6    This is only for whole classes of chipsets with specific problems which
   7    need early invasive action (e.g. before the timers are initialized).
   8    Most PCI device specific workarounds can be done later and should be
   9    in standard PCI quirks
  10    Mainboard specific bugs should be handled by DMI entries.
  11    CPU specific bugs in setup.c */
  12 
  13 #include <linux/pci.h>
  14 #include <linux/acpi.h>
  15 #include <linux/delay.h>
  16 #include <linux/pci_ids.h>
  17 #include <linux/bcma/bcma.h>
  18 #include <linux/bcma/bcma_regs.h>
  19 #include <linux/platform_data/x86/apple.h>
  20 #include <drm/i915_drm.h>
  21 #include <asm/pci-direct.h>
  22 #include <asm/dma.h>
  23 #include <asm/io_apic.h>
  24 #include <asm/apic.h>
  25 #include <asm/hpet.h>
  26 #include <asm/iommu.h>
  27 #include <asm/gart.h>
  28 #include <asm/irq_remapping.h>
  29 #include <asm/early_ioremap.h>
  30 
  31 static void __init fix_hypertransport_config(int num, int slot, int func)
  32 {
  33         u32 htcfg;
  34         /*
  35          * we found a hypertransport bus
  36          * make sure that we are broadcasting
  37          * interrupts to all cpus on the ht bus
  38          * if we're using extended apic ids
  39          */
  40         htcfg = read_pci_config(num, slot, func, 0x68);
  41         if (htcfg & (1 << 18)) {
  42                 printk(KERN_INFO "Detected use of extended apic ids "
  43                                  "on hypertransport bus\n");
  44                 if ((htcfg & (1 << 17)) == 0) {
  45                         printk(KERN_INFO "Enabling hypertransport extended "
  46                                          "apic interrupt broadcast\n");
  47                         printk(KERN_INFO "Note this is a bios bug, "
  48                                          "please contact your hw vendor\n");
  49                         htcfg |= (1 << 17);
  50                         write_pci_config(num, slot, func, 0x68, htcfg);
  51                 }
  52         }
  53 
  54 
  55 }
  56 
  57 static void __init via_bugs(int  num, int slot, int func)
  58 {
  59 #ifdef CONFIG_GART_IOMMU
  60         if ((max_pfn > MAX_DMA32_PFN ||  force_iommu) &&
  61             !gart_iommu_aperture_allowed) {
  62                 printk(KERN_INFO
  63                        "Looks like a VIA chipset. Disabling IOMMU."
  64                        " Override with iommu=allowed\n");
  65                 gart_iommu_aperture_disabled = 1;
  66         }
  67 #endif
  68 }
  69 
  70 #ifdef CONFIG_ACPI
  71 #ifdef CONFIG_X86_IO_APIC
  72 
  73 static int __init nvidia_hpet_check(struct acpi_table_header *header)
  74 {
  75         return 0;
  76 }
  77 #endif /* CONFIG_X86_IO_APIC */
  78 #endif /* CONFIG_ACPI */
  79 
  80 static void __init nvidia_bugs(int num, int slot, int func)
  81 {
  82 #ifdef CONFIG_ACPI
  83 #ifdef CONFIG_X86_IO_APIC
  84         /*
  85          * Only applies to Nvidia root ports (bus 0) and not to
  86          * Nvidia graphics cards with PCI ports on secondary buses.
  87          */
  88         if (num)
  89                 return;
  90 
  91         /*
  92          * All timer overrides on Nvidia are
  93          * wrong unless HPET is enabled.
  94          * Unfortunately that's not true on many Asus boards.
  95          * We don't know yet how to detect this automatically, but
  96          * at least allow a command line override.
  97          */
  98         if (acpi_use_timer_override)
  99                 return;
 100 
 101         if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
 102                 acpi_skip_timer_override = 1;
 103                 printk(KERN_INFO "Nvidia board "
 104                        "detected. Ignoring ACPI "
 105                        "timer override.\n");
 106                 printk(KERN_INFO "If you got timer trouble "
 107                         "try acpi_use_timer_override\n");
 108         }
 109 #endif
 110 #endif
 111         /* RED-PEN skip them on mptables too? */
 112 
 113 }
 114 
 115 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
 116 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
 117 {
 118         u32 d;
 119         u8  b;
 120 
 121         b = read_pci_config_byte(num, slot, func, 0xac);
 122         b &= ~(1<<5);
 123         write_pci_config_byte(num, slot, func, 0xac, b);
 124 
 125         d = read_pci_config(num, slot, func, 0x70);
 126         d |= 1<<8;
 127         write_pci_config(num, slot, func, 0x70, d);
 128 
 129         d = read_pci_config(num, slot, func, 0x8);
 130         d &= 0xff;
 131         return d;
 132 }
 133 
 134 static void __init ati_bugs(int num, int slot, int func)
 135 {
 136         u32 d;
 137         u8  b;
 138 
 139         if (acpi_use_timer_override)
 140                 return;
 141 
 142         d = ati_ixp4x0_rev(num, slot, func);
 143         if (d  < 0x82)
 144                 acpi_skip_timer_override = 1;
 145         else {
 146                 /* check for IRQ0 interrupt swap */
 147                 outb(0x72, 0xcd6); b = inb(0xcd7);
 148                 if (!(b & 0x2))
 149                         acpi_skip_timer_override = 1;
 150         }
 151 
 152         if (acpi_skip_timer_override) {
 153                 printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
 154                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 155                 printk(KERN_INFO "If you got timer trouble "
 156                        "try acpi_use_timer_override\n");
 157         }
 158 }
 159 
 160 static u32 __init ati_sbx00_rev(int num, int slot, int func)
 161 {
 162         u32 d;
 163 
 164         d = read_pci_config(num, slot, func, 0x8);
 165         d &= 0xff;
 166 
 167         return d;
 168 }
 169 
 170 static void __init ati_bugs_contd(int num, int slot, int func)
 171 {
 172         u32 d, rev;
 173 
 174         rev = ati_sbx00_rev(num, slot, func);
 175         if (rev >= 0x40)
 176                 acpi_fix_pin2_polarity = 1;
 177 
 178         /*
 179          * SB600: revisions 0x11, 0x12, 0x13, 0x14, ...
 180          * SB700: revisions 0x39, 0x3a, ...
 181          * SB800: revisions 0x40, 0x41, ...
 182          */
 183         if (rev >= 0x39)
 184                 return;
 185 
 186         if (acpi_use_timer_override)
 187                 return;
 188 
 189         /* check for IRQ0 interrupt swap */
 190         d = read_pci_config(num, slot, func, 0x64);
 191         if (!(d & (1<<14)))
 192                 acpi_skip_timer_override = 1;
 193 
 194         if (acpi_skip_timer_override) {
 195                 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
 196                 printk(KERN_INFO "Ignoring ACPI timer override.\n");
 197                 printk(KERN_INFO "If you got timer trouble "
 198                        "try acpi_use_timer_override\n");
 199         }
 200 }
 201 #else
 202 static void __init ati_bugs(int num, int slot, int func)
 203 {
 204 }
 205 
 206 static void __init ati_bugs_contd(int num, int slot, int func)
 207 {
 208 }
 209 #endif
 210 
 211 static void __init intel_remapping_check(int num, int slot, int func)
 212 {
 213         u8 revision;
 214         u16 device;
 215 
 216         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 217         revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID);
 218 
 219         /*
 220          * Revision <= 13 of all triggering devices id in this quirk
 221          * have a problem draining interrupts when irq remapping is
 222          * enabled, and should be flagged as broken. Additionally
 223          * revision 0x22 of device id 0x3405 has this problem.
 224          */
 225         if (revision <= 0x13)
 226                 set_irq_remapping_broken();
 227         else if (device == 0x3405 && revision == 0x22)
 228                 set_irq_remapping_broken();
 229 }
 230 
 231 /*
 232  * Systems with Intel graphics controllers set aside memory exclusively
 233  * for gfx driver use.  This memory is not marked in the E820 as reserved
 234  * or as RAM, and so is subject to overlap from E820 manipulation later
 235  * in the boot process.  On some systems, MMIO space is allocated on top,
 236  * despite the efforts of the "RAM buffer" approach, which simply rounds
 237  * memory boundaries up to 64M to try to catch space that may decode
 238  * as RAM and so is not suitable for MMIO.
 239  */
 240 
 241 #define KB(x)   ((x) * 1024UL)
 242 #define MB(x)   (KB (KB (x)))
 243 
 244 static resource_size_t __init i830_tseg_size(void)
 245 {
 246         u8 esmramc = read_pci_config_byte(0, 0, 0, I830_ESMRAMC);
 247 
 248         if (!(esmramc & TSEG_ENABLE))
 249                 return 0;
 250 
 251         if (esmramc & I830_TSEG_SIZE_1M)
 252                 return MB(1);
 253         else
 254                 return KB(512);
 255 }
 256 
 257 static resource_size_t __init i845_tseg_size(void)
 258 {
 259         u8 esmramc = read_pci_config_byte(0, 0, 0, I845_ESMRAMC);
 260         u8 tseg_size = esmramc & I845_TSEG_SIZE_MASK;
 261 
 262         if (!(esmramc & TSEG_ENABLE))
 263                 return 0;
 264 
 265         switch (tseg_size) {
 266         case I845_TSEG_SIZE_512K:       return KB(512);
 267         case I845_TSEG_SIZE_1M:         return MB(1);
 268         default:
 269                 WARN(1, "Unknown ESMRAMC value: %x!\n", esmramc);
 270         }
 271         return 0;
 272 }
 273 
 274 static resource_size_t __init i85x_tseg_size(void)
 275 {
 276         u8 esmramc = read_pci_config_byte(0, 0, 0, I85X_ESMRAMC);
 277 
 278         if (!(esmramc & TSEG_ENABLE))
 279                 return 0;
 280 
 281         return MB(1);
 282 }
 283 
 284 static resource_size_t __init i830_mem_size(void)
 285 {
 286         return read_pci_config_byte(0, 0, 0, I830_DRB3) * MB(32);
 287 }
 288 
 289 static resource_size_t __init i85x_mem_size(void)
 290 {
 291         return read_pci_config_byte(0, 0, 1, I85X_DRB3) * MB(32);
 292 }
 293 
 294 /*
 295  * On 830/845/85x the stolen memory base isn't available in any
 296  * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
 297  */
 298 static resource_size_t __init i830_stolen_base(int num, int slot, int func,
 299                                                resource_size_t stolen_size)
 300 {
 301         return i830_mem_size() - i830_tseg_size() - stolen_size;
 302 }
 303 
 304 static resource_size_t __init i845_stolen_base(int num, int slot, int func,
 305                                                resource_size_t stolen_size)
 306 {
 307         return i830_mem_size() - i845_tseg_size() - stolen_size;
 308 }
 309 
 310 static resource_size_t __init i85x_stolen_base(int num, int slot, int func,
 311                                                resource_size_t stolen_size)
 312 {
 313         return i85x_mem_size() - i85x_tseg_size() - stolen_size;
 314 }
 315 
 316 static resource_size_t __init i865_stolen_base(int num, int slot, int func,
 317                                                resource_size_t stolen_size)
 318 {
 319         u16 toud = 0;
 320 
 321         toud = read_pci_config_16(0, 0, 0, I865_TOUD);
 322 
 323         return toud * KB(64) + i845_tseg_size();
 324 }
 325 
 326 static resource_size_t __init gen3_stolen_base(int num, int slot, int func,
 327                                                resource_size_t stolen_size)
 328 {
 329         u32 bsm;
 330 
 331         /* Almost universally we can find the Graphics Base of Stolen Memory
 332          * at register BSM (0x5c) in the igfx configuration space. On a few
 333          * (desktop) machines this is also mirrored in the bridge device at
 334          * different locations, or in the MCHBAR.
 335          */
 336         bsm = read_pci_config(num, slot, func, INTEL_BSM);
 337 
 338         return bsm & INTEL_BSM_MASK;
 339 }
 340 
 341 static resource_size_t __init gen11_stolen_base(int num, int slot, int func,
 342                                                 resource_size_t stolen_size)
 343 {
 344         u64 bsm;
 345 
 346         bsm = read_pci_config(num, slot, func, INTEL_GEN11_BSM_DW0);
 347         bsm &= INTEL_BSM_MASK;
 348         bsm |= (u64)read_pci_config(num, slot, func, INTEL_GEN11_BSM_DW1) << 32;
 349 
 350         return bsm;
 351 }
 352 
 353 static resource_size_t __init i830_stolen_size(int num, int slot, int func)
 354 {
 355         u16 gmch_ctrl;
 356         u16 gms;
 357 
 358         gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
 359         gms = gmch_ctrl & I830_GMCH_GMS_MASK;
 360 
 361         switch (gms) {
 362         case I830_GMCH_GMS_STOLEN_512:  return KB(512);
 363         case I830_GMCH_GMS_STOLEN_1024: return MB(1);
 364         case I830_GMCH_GMS_STOLEN_8192: return MB(8);
 365         /* local memory isn't part of the normal address space */
 366         case I830_GMCH_GMS_LOCAL:       return 0;
 367         default:
 368                 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
 369         }
 370 
 371         return 0;
 372 }
 373 
 374 static resource_size_t __init gen3_stolen_size(int num, int slot, int func)
 375 {
 376         u16 gmch_ctrl;
 377         u16 gms;
 378 
 379         gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
 380         gms = gmch_ctrl & I855_GMCH_GMS_MASK;
 381 
 382         switch (gms) {
 383         case I855_GMCH_GMS_STOLEN_1M:   return MB(1);
 384         case I855_GMCH_GMS_STOLEN_4M:   return MB(4);
 385         case I855_GMCH_GMS_STOLEN_8M:   return MB(8);
 386         case I855_GMCH_GMS_STOLEN_16M:  return MB(16);
 387         case I855_GMCH_GMS_STOLEN_32M:  return MB(32);
 388         case I915_GMCH_GMS_STOLEN_48M:  return MB(48);
 389         case I915_GMCH_GMS_STOLEN_64M:  return MB(64);
 390         case G33_GMCH_GMS_STOLEN_128M:  return MB(128);
 391         case G33_GMCH_GMS_STOLEN_256M:  return MB(256);
 392         case INTEL_GMCH_GMS_STOLEN_96M: return MB(96);
 393         case INTEL_GMCH_GMS_STOLEN_160M:return MB(160);
 394         case INTEL_GMCH_GMS_STOLEN_224M:return MB(224);
 395         case INTEL_GMCH_GMS_STOLEN_352M:return MB(352);
 396         default:
 397                 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
 398         }
 399 
 400         return 0;
 401 }
 402 
 403 static resource_size_t __init gen6_stolen_size(int num, int slot, int func)
 404 {
 405         u16 gmch_ctrl;
 406         u16 gms;
 407 
 408         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 409         gms = (gmch_ctrl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
 410 
 411         return gms * MB(32);
 412 }
 413 
 414 static resource_size_t __init gen8_stolen_size(int num, int slot, int func)
 415 {
 416         u16 gmch_ctrl;
 417         u16 gms;
 418 
 419         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 420         gms = (gmch_ctrl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
 421 
 422         return gms * MB(32);
 423 }
 424 
 425 static resource_size_t __init chv_stolen_size(int num, int slot, int func)
 426 {
 427         u16 gmch_ctrl;
 428         u16 gms;
 429 
 430         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 431         gms = (gmch_ctrl >> SNB_GMCH_GMS_SHIFT) & SNB_GMCH_GMS_MASK;
 432 
 433         /*
 434          * 0x0  to 0x10: 32MB increments starting at 0MB
 435          * 0x11 to 0x16: 4MB increments starting at 8MB
 436          * 0x17 to 0x1d: 4MB increments start at 36MB
 437          */
 438         if (gms < 0x11)
 439                 return gms * MB(32);
 440         else if (gms < 0x17)
 441                 return (gms - 0x11) * MB(4) + MB(8);
 442         else
 443                 return (gms - 0x17) * MB(4) + MB(36);
 444 }
 445 
 446 static resource_size_t __init gen9_stolen_size(int num, int slot, int func)
 447 {
 448         u16 gmch_ctrl;
 449         u16 gms;
 450 
 451         gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
 452         gms = (gmch_ctrl >> BDW_GMCH_GMS_SHIFT) & BDW_GMCH_GMS_MASK;
 453 
 454         /* 0x0  to 0xef: 32MB increments starting at 0MB */
 455         /* 0xf0 to 0xfe: 4MB increments starting at 4MB */
 456         if (gms < 0xf0)
 457                 return gms * MB(32);
 458         else
 459                 return (gms - 0xf0) * MB(4) + MB(4);
 460 }
 461 
 462 struct intel_early_ops {
 463         resource_size_t (*stolen_size)(int num, int slot, int func);
 464         resource_size_t (*stolen_base)(int num, int slot, int func,
 465                                        resource_size_t size);
 466 };
 467 
 468 static const struct intel_early_ops i830_early_ops __initconst = {
 469         .stolen_base = i830_stolen_base,
 470         .stolen_size = i830_stolen_size,
 471 };
 472 
 473 static const struct intel_early_ops i845_early_ops __initconst = {
 474         .stolen_base = i845_stolen_base,
 475         .stolen_size = i830_stolen_size,
 476 };
 477 
 478 static const struct intel_early_ops i85x_early_ops __initconst = {
 479         .stolen_base = i85x_stolen_base,
 480         .stolen_size = gen3_stolen_size,
 481 };
 482 
 483 static const struct intel_early_ops i865_early_ops __initconst = {
 484         .stolen_base = i865_stolen_base,
 485         .stolen_size = gen3_stolen_size,
 486 };
 487 
 488 static const struct intel_early_ops gen3_early_ops __initconst = {
 489         .stolen_base = gen3_stolen_base,
 490         .stolen_size = gen3_stolen_size,
 491 };
 492 
 493 static const struct intel_early_ops gen6_early_ops __initconst = {
 494         .stolen_base = gen3_stolen_base,
 495         .stolen_size = gen6_stolen_size,
 496 };
 497 
 498 static const struct intel_early_ops gen8_early_ops __initconst = {
 499         .stolen_base = gen3_stolen_base,
 500         .stolen_size = gen8_stolen_size,
 501 };
 502 
 503 static const struct intel_early_ops gen9_early_ops __initconst = {
 504         .stolen_base = gen3_stolen_base,
 505         .stolen_size = gen9_stolen_size,
 506 };
 507 
 508 static const struct intel_early_ops chv_early_ops __initconst = {
 509         .stolen_base = gen3_stolen_base,
 510         .stolen_size = chv_stolen_size,
 511 };
 512 
 513 static const struct intel_early_ops gen11_early_ops __initconst = {
 514         .stolen_base = gen11_stolen_base,
 515         .stolen_size = gen9_stolen_size,
 516 };
 517 
 518 static const struct pci_device_id intel_early_ids[] __initconst = {
 519         INTEL_I830_IDS(&i830_early_ops),
 520         INTEL_I845G_IDS(&i845_early_ops),
 521         INTEL_I85X_IDS(&i85x_early_ops),
 522         INTEL_I865G_IDS(&i865_early_ops),
 523         INTEL_I915G_IDS(&gen3_early_ops),
 524         INTEL_I915GM_IDS(&gen3_early_ops),
 525         INTEL_I945G_IDS(&gen3_early_ops),
 526         INTEL_I945GM_IDS(&gen3_early_ops),
 527         INTEL_VLV_IDS(&gen6_early_ops),
 528         INTEL_PINEVIEW_G_IDS(&gen3_early_ops),
 529         INTEL_PINEVIEW_M_IDS(&gen3_early_ops),
 530         INTEL_I965G_IDS(&gen3_early_ops),
 531         INTEL_G33_IDS(&gen3_early_ops),
 532         INTEL_I965GM_IDS(&gen3_early_ops),
 533         INTEL_GM45_IDS(&gen3_early_ops),
 534         INTEL_G45_IDS(&gen3_early_ops),
 535         INTEL_IRONLAKE_D_IDS(&gen3_early_ops),
 536         INTEL_IRONLAKE_M_IDS(&gen3_early_ops),
 537         INTEL_SNB_D_IDS(&gen6_early_ops),
 538         INTEL_SNB_M_IDS(&gen6_early_ops),
 539         INTEL_IVB_M_IDS(&gen6_early_ops),
 540         INTEL_IVB_D_IDS(&gen6_early_ops),
 541         INTEL_HSW_IDS(&gen6_early_ops),
 542         INTEL_BDW_IDS(&gen8_early_ops),
 543         INTEL_CHV_IDS(&chv_early_ops),
 544         INTEL_SKL_IDS(&gen9_early_ops),
 545         INTEL_BXT_IDS(&gen9_early_ops),
 546         INTEL_KBL_IDS(&gen9_early_ops),
 547         INTEL_CFL_IDS(&gen9_early_ops),
 548         INTEL_GLK_IDS(&gen9_early_ops),
 549         INTEL_CNL_IDS(&gen9_early_ops),
 550         INTEL_ICL_11_IDS(&gen11_early_ops),
 551         INTEL_EHL_IDS(&gen11_early_ops),
 552         INTEL_TGL_12_IDS(&gen11_early_ops),
 553 };
 554 
 555 struct resource intel_graphics_stolen_res __ro_after_init = DEFINE_RES_MEM(0, 0);
 556 EXPORT_SYMBOL(intel_graphics_stolen_res);
 557 
 558 static void __init
 559 intel_graphics_stolen(int num, int slot, int func,
 560                       const struct intel_early_ops *early_ops)
 561 {
 562         resource_size_t base, size;
 563         resource_size_t end;
 564 
 565         size = early_ops->stolen_size(num, slot, func);
 566         base = early_ops->stolen_base(num, slot, func, size);
 567 
 568         if (!size || !base)
 569                 return;
 570 
 571         end = base + size - 1;
 572 
 573         intel_graphics_stolen_res.start = base;
 574         intel_graphics_stolen_res.end = end;
 575 
 576         printk(KERN_INFO "Reserving Intel graphics memory at %pR\n",
 577                &intel_graphics_stolen_res);
 578 
 579         /* Mark this space as reserved */
 580         e820__range_add(base, size, E820_TYPE_RESERVED);
 581         e820__update_table(e820_table);
 582 }
 583 
 584 static void __init intel_graphics_quirks(int num, int slot, int func)
 585 {
 586         const struct intel_early_ops *early_ops;
 587         u16 device;
 588         int i;
 589 
 590         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 591 
 592         for (i = 0; i < ARRAY_SIZE(intel_early_ids); i++) {
 593                 kernel_ulong_t driver_data = intel_early_ids[i].driver_data;
 594 
 595                 if (intel_early_ids[i].device != device)
 596                         continue;
 597 
 598                 early_ops = (typeof(early_ops))driver_data;
 599 
 600                 intel_graphics_stolen(num, slot, func, early_ops);
 601 
 602                 return;
 603         }
 604 }
 605 
 606 static void __init force_disable_hpet(int num, int slot, int func)
 607 {
 608 #ifdef CONFIG_HPET_TIMER
 609         boot_hpet_disable = true;
 610         pr_info("x86/hpet: Will disable the HPET for this platform because it's not reliable\n");
 611 #endif
 612 }
 613 
 614 #define BCM4331_MMIO_SIZE       16384
 615 #define BCM4331_PM_CAP          0x40
 616 #define bcma_aread32(reg)       ioread32(mmio + 1 * BCMA_CORE_SIZE + reg)
 617 #define bcma_awrite32(reg, val) iowrite32(val, mmio + 1 * BCMA_CORE_SIZE + reg)
 618 
 619 static void __init apple_airport_reset(int bus, int slot, int func)
 620 {
 621         void __iomem *mmio;
 622         u16 pmcsr;
 623         u64 addr;
 624         int i;
 625 
 626         if (!x86_apple_machine)
 627                 return;
 628 
 629         /* Card may have been put into PCI_D3hot by grub quirk */
 630         pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
 631 
 632         if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
 633                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
 634                 write_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL, pmcsr);
 635                 mdelay(10);
 636 
 637                 pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
 638                 if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
 639                         pr_err("pci 0000:%02x:%02x.%d: Cannot power up Apple AirPort card\n",
 640                                bus, slot, func);
 641                         return;
 642                 }
 643         }
 644 
 645         addr  =      read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
 646         addr |= (u64)read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_1) << 32;
 647         addr &= PCI_BASE_ADDRESS_MEM_MASK;
 648 
 649         mmio = early_ioremap(addr, BCM4331_MMIO_SIZE);
 650         if (!mmio) {
 651                 pr_err("pci 0000:%02x:%02x.%d: Cannot iomap Apple AirPort card\n",
 652                        bus, slot, func);
 653                 return;
 654         }
 655 
 656         pr_info("Resetting Apple AirPort card (left enabled by EFI)\n");
 657 
 658         for (i = 0; bcma_aread32(BCMA_RESET_ST) && i < 30; i++)
 659                 udelay(10);
 660 
 661         bcma_awrite32(BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
 662         bcma_aread32(BCMA_RESET_CTL);
 663         udelay(1);
 664 
 665         bcma_awrite32(BCMA_RESET_CTL, 0);
 666         bcma_aread32(BCMA_RESET_CTL);
 667         udelay(10);
 668 
 669         early_iounmap(mmio, BCM4331_MMIO_SIZE);
 670 }
 671 
 672 #define QFLAG_APPLY_ONCE        0x1
 673 #define QFLAG_APPLIED           0x2
 674 #define QFLAG_DONE              (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
 675 struct chipset {
 676         u32 vendor;
 677         u32 device;
 678         u32 class;
 679         u32 class_mask;
 680         u32 flags;
 681         void (*f)(int num, int slot, int func);
 682 };
 683 
 684 static struct chipset early_qrk[] __initdata = {
 685         { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
 686           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
 687         { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
 688           PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
 689         { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
 690           PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
 691         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
 692           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
 693         { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
 694           PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
 695         { PCI_VENDOR_ID_INTEL, 0x3403, PCI_CLASS_BRIDGE_HOST,
 696           PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
 697         { PCI_VENDOR_ID_INTEL, 0x3405, PCI_CLASS_BRIDGE_HOST,
 698           PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
 699         { PCI_VENDOR_ID_INTEL, 0x3406, PCI_CLASS_BRIDGE_HOST,
 700           PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
 701         { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, PCI_ANY_ID,
 702           QFLAG_APPLY_ONCE, intel_graphics_quirks },
 703         /*
 704          * HPET on the current version of the Baytrail platform has accuracy
 705          * problems: it will halt in deep idle state - so we disable it.
 706          *
 707          * More details can be found in section 18.10.1.3 of the datasheet:
 708          *
 709          *    http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/atom-z8000-datasheet-vol-1.pdf
 710          */
 711         { PCI_VENDOR_ID_INTEL, 0x0f00,
 712                 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
 713         { PCI_VENDOR_ID_INTEL, 0x3e20,
 714                 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
 715         { PCI_VENDOR_ID_INTEL, 0x3ec4,
 716                 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
 717         { PCI_VENDOR_ID_INTEL, 0x8a12,
 718                 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
 719         { PCI_VENDOR_ID_BROADCOM, 0x4331,
 720           PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset},
 721         {}
 722 };
 723 
 724 static void __init early_pci_scan_bus(int bus);
 725 
 726 /**
 727  * check_dev_quirk - apply early quirks to a given PCI device
 728  * @num: bus number
 729  * @slot: slot number
 730  * @func: PCI function
 731  *
 732  * Check the vendor & device ID against the early quirks table.
 733  *
 734  * If the device is single function, let early_pci_scan_bus() know so we don't
 735  * poke at this device again.
 736  */
 737 static int __init check_dev_quirk(int num, int slot, int func)
 738 {
 739         u16 class;
 740         u16 vendor;
 741         u16 device;
 742         u8 type;
 743         u8 sec;
 744         int i;
 745 
 746         class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
 747 
 748         if (class == 0xffff)
 749                 return -1; /* no class, treat as single function */
 750 
 751         vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
 752 
 753         device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
 754 
 755         for (i = 0; early_qrk[i].f != NULL; i++) {
 756                 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
 757                         (early_qrk[i].vendor == vendor)) &&
 758                         ((early_qrk[i].device == PCI_ANY_ID) ||
 759                         (early_qrk[i].device == device)) &&
 760                         (!((early_qrk[i].class ^ class) &
 761                             early_qrk[i].class_mask))) {
 762                                 if ((early_qrk[i].flags &
 763                                      QFLAG_DONE) != QFLAG_DONE)
 764                                         early_qrk[i].f(num, slot, func);
 765                                 early_qrk[i].flags |= QFLAG_APPLIED;
 766                         }
 767         }
 768 
 769         type = read_pci_config_byte(num, slot, func,
 770                                     PCI_HEADER_TYPE);
 771 
 772         if ((type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
 773                 sec = read_pci_config_byte(num, slot, func, PCI_SECONDARY_BUS);
 774                 if (sec > num)
 775                         early_pci_scan_bus(sec);
 776         }
 777 
 778         if (!(type & 0x80))
 779                 return -1;
 780 
 781         return 0;
 782 }
 783 
 784 static void __init early_pci_scan_bus(int bus)
 785 {
 786         int slot, func;
 787 
 788         /* Poor man's PCI discovery */
 789         for (slot = 0; slot < 32; slot++)
 790                 for (func = 0; func < 8; func++) {
 791                         /* Only probe function 0 on single fn devices */
 792                         if (check_dev_quirk(bus, slot, func))
 793                                 break;
 794                 }
 795 }
 796 
 797 void __init early_quirks(void)
 798 {
 799         if (!early_pci_allowed())
 800                 return;
 801 
 802         early_pci_scan_bus(0);
 803 }