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