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
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
9 Mainboard specific bugs should be handled by DMI entries.
10 CPU specific bugs in setup.c */
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>
22 #include <asm/io_apic.h>
25 #include <asm/iommu.h>
27 #include <asm/irq_remapping.h>
28 #include <asm/early_ioremap.h>
30 #define dev_err(msg) pr_err("pci 0000:%02x:%02x.%d: %s", bus, slot, func, msg)
32 static void __init fix_hypertransport_config(int num, int slot, int func)
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
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");
51 write_pci_config(num, slot, func, 0x68, htcfg);
58 static void __init via_bugs(int num, int slot, int func)
60 #ifdef CONFIG_GART_IOMMU
61 if ((max_pfn > MAX_DMA32_PFN || force_iommu) &&
62 !gart_iommu_aperture_allowed) {
64 "Looks like a VIA chipset. Disabling IOMMU."
65 " Override with iommu=allowed\n");
66 gart_iommu_aperture_disabled = 1;
72 #ifdef CONFIG_X86_IO_APIC
74 static int __init nvidia_hpet_check(struct acpi_table_header *header)
78 #endif /* CONFIG_X86_IO_APIC */
79 #endif /* CONFIG_ACPI */
81 static void __init nvidia_bugs(int num, int slot, int func)
84 #ifdef CONFIG_X86_IO_APIC
86 * Only applies to Nvidia root ports (bus 0) and not to
87 * Nvidia graphics cards with PCI ports on secondary buses.
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.
99 if (acpi_use_timer_override)
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");
112 /* RED-PEN skip them on mptables too? */
116 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
117 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
122 b = read_pci_config_byte(num, slot, func, 0xac);
124 write_pci_config_byte(num, slot, func, 0xac, b);
126 d = read_pci_config(num, slot, func, 0x70);
128 write_pci_config(num, slot, func, 0x70, d);
130 d = read_pci_config(num, slot, func, 0x8);
135 static void __init ati_bugs(int num, int slot, int func)
140 if (acpi_use_timer_override)
143 d = ati_ixp4x0_rev(num, slot, func);
145 acpi_skip_timer_override = 1;
147 /* check for IRQ0 interrupt swap */
148 outb(0x72, 0xcd6); b = inb(0xcd7);
150 acpi_skip_timer_override = 1;
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");
161 static u32 __init ati_sbx00_rev(int num, int slot, int func)
165 d = read_pci_config(num, slot, func, 0x8);
171 static void __init ati_bugs_contd(int num, int slot, int func)
175 rev = ati_sbx00_rev(num, slot, func);
177 acpi_fix_pin2_polarity = 1;
180 * SB600: revisions 0x11, 0x12, 0x13, 0x14, ...
181 * SB700: revisions 0x39, 0x3a, ...
182 * SB800: revisions 0x40, 0x41, ...
187 if (acpi_use_timer_override)
190 /* check for IRQ0 interrupt swap */
191 d = read_pci_config(num, slot, func, 0x64);
193 acpi_skip_timer_override = 1;
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");
203 static void __init ati_bugs(int num, int slot, int func)
207 static void __init ati_bugs_contd(int num, int slot, int func)
212 static void __init intel_remapping_check(int num, int slot, int func)
217 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
218 revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID);
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.
226 if (revision <= 0x13)
227 set_irq_remapping_broken();
228 else if (device == 0x3405 && revision == 0x22)
229 set_irq_remapping_broken();
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.
242 #define KB(x) ((x) * 1024UL)
243 #define MB(x) (KB (KB (x)))
245 static size_t __init i830_tseg_size(void)
247 u8 esmramc = read_pci_config_byte(0, 0, 0, I830_ESMRAMC);
249 if (!(esmramc & TSEG_ENABLE))
252 if (esmramc & I830_TSEG_SIZE_1M)
258 static size_t __init i845_tseg_size(void)
260 u8 esmramc = read_pci_config_byte(0, 0, 0, I845_ESMRAMC);
261 u8 tseg_size = esmramc & I845_TSEG_SIZE_MASK;
263 if (!(esmramc & TSEG_ENABLE))
267 case I845_TSEG_SIZE_512K: return KB(512);
268 case I845_TSEG_SIZE_1M: return MB(1);
270 WARN(1, "Unknown ESMRAMC value: %x!\n", esmramc);
275 static size_t __init i85x_tseg_size(void)
277 u8 esmramc = read_pci_config_byte(0, 0, 0, I85X_ESMRAMC);
279 if (!(esmramc & TSEG_ENABLE))
285 static size_t __init i830_mem_size(void)
287 return read_pci_config_byte(0, 0, 0, I830_DRB3) * MB(32);
290 static size_t __init i85x_mem_size(void)
292 return read_pci_config_byte(0, 0, 1, I85X_DRB3) * MB(32);
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.
299 static phys_addr_t __init i830_stolen_base(int num, int slot, int func,
302 return (phys_addr_t)i830_mem_size() - i830_tseg_size() - stolen_size;
305 static phys_addr_t __init i845_stolen_base(int num, int slot, int func,
308 return (phys_addr_t)i830_mem_size() - i845_tseg_size() - stolen_size;
311 static phys_addr_t __init i85x_stolen_base(int num, int slot, int func,
314 return (phys_addr_t)i85x_mem_size() - i85x_tseg_size() - stolen_size;
317 static phys_addr_t __init i865_stolen_base(int num, int slot, int func,
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?
327 toud = read_pci_config_16(0, 0, 0, I865_TOUD);
329 return (phys_addr_t)toud << 16;
332 static phys_addr_t __init gen3_stolen_base(int num, int slot, int func,
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.
342 bsm = read_pci_config(num, slot, func, INTEL_BSM);
344 return (phys_addr_t)bsm & INTEL_BSM_MASK;
347 static size_t __init i830_stolen_size(int num, int slot, int func)
352 gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
353 gms = gmch_ctrl & I830_GMCH_GMS_MASK;
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;
362 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
368 static size_t __init gen3_stolen_size(int num, int slot, int func)
373 gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
374 gms = gmch_ctrl & I855_GMCH_GMS_MASK;
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);
391 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
397 static size_t __init gen6_stolen_size(int num, int slot, int func)
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;
405 return (size_t)gms * MB(32);
408 static size_t __init gen8_stolen_size(int num, int slot, int func)
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;
416 return (size_t)gms * MB(32);
419 static size_t __init chv_stolen_size(int num, int slot, int func)
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;
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
433 return (size_t)gms * MB(32);
435 return (size_t)(gms - 0x11 + 2) * MB(4);
437 return (size_t)(gms - 0x17 + 9) * MB(4);
440 static size_t __init gen9_stolen_size(int num, int slot, int func)
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;
448 /* 0x0 to 0xef: 32MB increments starting at 0MB */
449 /* 0xf0 to 0xfe: 4MB increments starting at 4MB */
451 return (size_t)gms * MB(32);
453 return (size_t)(gms - 0xf0 + 1) * MB(4);
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);
461 static const struct intel_early_ops i830_early_ops __initconst = {
462 .stolen_base = i830_stolen_base,
463 .stolen_size = i830_stolen_size,
466 static const struct intel_early_ops i845_early_ops __initconst = {
467 .stolen_base = i845_stolen_base,
468 .stolen_size = i830_stolen_size,
471 static const struct intel_early_ops i85x_early_ops __initconst = {
472 .stolen_base = i85x_stolen_base,
473 .stolen_size = gen3_stolen_size,
476 static const struct intel_early_ops i865_early_ops __initconst = {
477 .stolen_base = i865_stolen_base,
478 .stolen_size = gen3_stolen_size,
481 static const struct intel_early_ops gen3_early_ops __initconst = {
482 .stolen_base = gen3_stolen_base,
483 .stolen_size = gen3_stolen_size,
486 static const struct intel_early_ops gen6_early_ops __initconst = {
487 .stolen_base = gen3_stolen_base,
488 .stolen_size = gen6_stolen_size,
491 static const struct intel_early_ops gen8_early_ops __initconst = {
492 .stolen_base = gen3_stolen_base,
493 .stolen_size = gen8_stolen_size,
496 static const struct intel_early_ops gen9_early_ops __initconst = {
497 .stolen_base = gen3_stolen_base,
498 .stolen_size = gen9_stolen_size,
501 static const struct intel_early_ops chv_early_ops __initconst = {
502 .stolen_base = gen3_stolen_base,
503 .stolen_size = chv_stolen_size,
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),
540 intel_graphics_stolen(int num, int slot, int func,
541 const struct intel_early_ops *early_ops)
543 phys_addr_t base, end;
546 size = early_ops->stolen_size(num, slot, func);
547 base = early_ops->stolen_base(num, slot, func, size);
552 end = base + size - 1;
553 printk(KERN_INFO "Reserving Intel graphics memory at %pa-%pa\n",
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);
561 static void __init intel_graphics_quirks(int num, int slot, int func)
563 const struct intel_early_ops *early_ops;
567 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
569 for (i = 0; i < ARRAY_SIZE(intel_early_ids); i++) {
570 kernel_ulong_t driver_data = intel_early_ids[i].driver_data;
572 if (intel_early_ids[i].device != device)
575 early_ops = (typeof(early_ops))driver_data;
577 intel_graphics_stolen(num, slot, func, early_ops);
583 static void __init force_disable_hpet(int num, int slot, int func)
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");
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)
596 static void __init apple_airport_reset(int bus, int slot, int func)
603 if (!dmi_match(DMI_SYS_VENDOR, "Apple Inc."))
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);
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);
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");
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;
625 mmio = early_ioremap(addr, BCM4331_MMIO_SIZE);
627 dev_err("Cannot iomap Apple AirPort card\n");
631 pr_info("Resetting Apple AirPort card (left enabled by EFI)\n");
633 for (i = 0; bcma_aread32(BCMA_RESET_ST) && i < 30; i++)
636 bcma_awrite32(BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
637 bcma_aread32(BCMA_RESET_CTL);
640 bcma_awrite32(BCMA_RESET_CTL, 0);
641 bcma_aread32(BCMA_RESET_CTL);
644 early_iounmap(mmio, BCM4331_MMIO_SIZE);
647 #define QFLAG_APPLY_ONCE 0x1
648 #define QFLAG_APPLIED 0x2
649 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
656 void (*f)(int num, int slot, int func);
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 },
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.
682 * More details can be found in section 18.10.1.3 of the datasheet:
684 * http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/atom-z8000-datasheet-vol-1.pdf
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},
693 static void __init early_pci_scan_bus(int bus);
696 * check_dev_quirk - apply early quirks to a given PCI device
699 * @func: PCI function
701 * Check the vendor & device ID against the early quirks table.
703 * If the device is single function, let early_pci_scan_bus() know so we don't
704 * poke at this device again.
706 static int __init check_dev_quirk(int num, int slot, int func)
715 class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
718 return -1; /* no class, treat as single function */
720 vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
722 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
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;
738 type = read_pci_config_byte(num, slot, func,
741 if ((type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
742 sec = read_pci_config_byte(num, slot, func, PCI_SECONDARY_BUS);
744 early_pci_scan_bus(sec);
753 static void __init early_pci_scan_bus(int bus)
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))
766 void __init early_quirks(void)
768 if (!early_pci_allowed())
771 early_pci_scan_bus(0);