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
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
10 Mainboard specific bugs should be handled by DMI entries.
11 CPU specific bugs in setup.c */
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>
23 #include <asm/io_apic.h>
26 #include <asm/iommu.h>
28 #include <asm/irq_remapping.h>
29 #include <asm/early_ioremap.h>
31 static void __init fix_hypertransport_config(int num, int slot, int func)
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
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");
50 write_pci_config(num, slot, func, 0x68, htcfg);
57 static void __init via_bugs(int num, int slot, int func)
59 #ifdef CONFIG_GART_IOMMU
60 if ((max_pfn > MAX_DMA32_PFN || force_iommu) &&
61 !gart_iommu_aperture_allowed) {
63 "Looks like a VIA chipset. Disabling IOMMU."
64 " Override with iommu=allowed\n");
65 gart_iommu_aperture_disabled = 1;
71 #ifdef CONFIG_X86_IO_APIC
73 static int __init nvidia_hpet_check(struct acpi_table_header *header)
77 #endif /* CONFIG_X86_IO_APIC */
78 #endif /* CONFIG_ACPI */
80 static void __init nvidia_bugs(int num, int slot, int func)
83 #ifdef CONFIG_X86_IO_APIC
85 * Only applies to Nvidia root ports (bus 0) and not to
86 * Nvidia graphics cards with PCI ports on secondary buses.
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.
98 if (acpi_use_timer_override)
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");
111 /* RED-PEN skip them on mptables too? */
115 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
116 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
121 b = read_pci_config_byte(num, slot, func, 0xac);
123 write_pci_config_byte(num, slot, func, 0xac, b);
125 d = read_pci_config(num, slot, func, 0x70);
127 write_pci_config(num, slot, func, 0x70, d);
129 d = read_pci_config(num, slot, func, 0x8);
134 static void __init ati_bugs(int num, int slot, int func)
139 if (acpi_use_timer_override)
142 d = ati_ixp4x0_rev(num, slot, func);
144 acpi_skip_timer_override = 1;
146 /* check for IRQ0 interrupt swap */
147 outb(0x72, 0xcd6); b = inb(0xcd7);
149 acpi_skip_timer_override = 1;
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");
160 static u32 __init ati_sbx00_rev(int num, int slot, int func)
164 d = read_pci_config(num, slot, func, 0x8);
170 static void __init ati_bugs_contd(int num, int slot, int func)
174 rev = ati_sbx00_rev(num, slot, func);
176 acpi_fix_pin2_polarity = 1;
179 * SB600: revisions 0x11, 0x12, 0x13, 0x14, ...
180 * SB700: revisions 0x39, 0x3a, ...
181 * SB800: revisions 0x40, 0x41, ...
186 if (acpi_use_timer_override)
189 /* check for IRQ0 interrupt swap */
190 d = read_pci_config(num, slot, func, 0x64);
192 acpi_skip_timer_override = 1;
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");
202 static void __init ati_bugs(int num, int slot, int func)
206 static void __init ati_bugs_contd(int num, int slot, int func)
211 static void __init intel_remapping_check(int num, int slot, int func)
216 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
217 revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID);
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.
225 if (revision <= 0x13)
226 set_irq_remapping_broken();
227 else if (device == 0x3405 && revision == 0x22)
228 set_irq_remapping_broken();
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.
241 #define KB(x) ((x) * 1024UL)
242 #define MB(x) (KB (KB (x)))
244 static resource_size_t __init i830_tseg_size(void)
246 u8 esmramc = read_pci_config_byte(0, 0, 0, I830_ESMRAMC);
248 if (!(esmramc & TSEG_ENABLE))
251 if (esmramc & I830_TSEG_SIZE_1M)
257 static resource_size_t __init i845_tseg_size(void)
259 u8 esmramc = read_pci_config_byte(0, 0, 0, I845_ESMRAMC);
260 u8 tseg_size = esmramc & I845_TSEG_SIZE_MASK;
262 if (!(esmramc & TSEG_ENABLE))
266 case I845_TSEG_SIZE_512K: return KB(512);
267 case I845_TSEG_SIZE_1M: return MB(1);
269 WARN(1, "Unknown ESMRAMC value: %x!\n", esmramc);
274 static resource_size_t __init i85x_tseg_size(void)
276 u8 esmramc = read_pci_config_byte(0, 0, 0, I85X_ESMRAMC);
278 if (!(esmramc & TSEG_ENABLE))
284 static resource_size_t __init i830_mem_size(void)
286 return read_pci_config_byte(0, 0, 0, I830_DRB3) * MB(32);
289 static resource_size_t __init i85x_mem_size(void)
291 return read_pci_config_byte(0, 0, 1, I85X_DRB3) * MB(32);
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.
298 static resource_size_t __init i830_stolen_base(int num, int slot, int func,
299 resource_size_t stolen_size)
301 return i830_mem_size() - i830_tseg_size() - stolen_size;
304 static resource_size_t __init i845_stolen_base(int num, int slot, int func,
305 resource_size_t stolen_size)
307 return i830_mem_size() - i845_tseg_size() - stolen_size;
310 static resource_size_t __init i85x_stolen_base(int num, int slot, int func,
311 resource_size_t stolen_size)
313 return i85x_mem_size() - i85x_tseg_size() - stolen_size;
316 static resource_size_t __init i865_stolen_base(int num, int slot, int func,
317 resource_size_t stolen_size)
321 toud = read_pci_config_16(0, 0, 0, I865_TOUD);
323 return toud * KB(64) + i845_tseg_size();
326 static resource_size_t __init gen3_stolen_base(int num, int slot, int func,
327 resource_size_t stolen_size)
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.
336 bsm = read_pci_config(num, slot, func, INTEL_BSM);
338 return bsm & INTEL_BSM_MASK;
341 static resource_size_t __init gen11_stolen_base(int num, int slot, int func,
342 resource_size_t stolen_size)
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;
353 static resource_size_t __init i830_stolen_size(int num, int slot, int func)
358 gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
359 gms = gmch_ctrl & I830_GMCH_GMS_MASK;
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;
368 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
374 static resource_size_t __init gen3_stolen_size(int num, int slot, int func)
379 gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
380 gms = gmch_ctrl & I855_GMCH_GMS_MASK;
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);
397 WARN(1, "Unknown GMCH_CTRL value: %x!\n", gmch_ctrl);
403 static resource_size_t __init gen6_stolen_size(int num, int slot, int func)
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;
414 static resource_size_t __init gen8_stolen_size(int num, int slot, int func)
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;
425 static resource_size_t __init chv_stolen_size(int num, int slot, int func)
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;
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
441 return (gms - 0x11) * MB(4) + MB(8);
443 return (gms - 0x17) * MB(4) + MB(36);
446 static resource_size_t __init gen9_stolen_size(int num, int slot, int func)
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;
454 /* 0x0 to 0xef: 32MB increments starting at 0MB */
455 /* 0xf0 to 0xfe: 4MB increments starting at 4MB */
459 return (gms - 0xf0) * MB(4) + MB(4);
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);
468 static const struct intel_early_ops i830_early_ops __initconst = {
469 .stolen_base = i830_stolen_base,
470 .stolen_size = i830_stolen_size,
473 static const struct intel_early_ops i845_early_ops __initconst = {
474 .stolen_base = i845_stolen_base,
475 .stolen_size = i830_stolen_size,
478 static const struct intel_early_ops i85x_early_ops __initconst = {
479 .stolen_base = i85x_stolen_base,
480 .stolen_size = gen3_stolen_size,
483 static const struct intel_early_ops i865_early_ops __initconst = {
484 .stolen_base = i865_stolen_base,
485 .stolen_size = gen3_stolen_size,
488 static const struct intel_early_ops gen3_early_ops __initconst = {
489 .stolen_base = gen3_stolen_base,
490 .stolen_size = gen3_stolen_size,
493 static const struct intel_early_ops gen6_early_ops __initconst = {
494 .stolen_base = gen3_stolen_base,
495 .stolen_size = gen6_stolen_size,
498 static const struct intel_early_ops gen8_early_ops __initconst = {
499 .stolen_base = gen3_stolen_base,
500 .stolen_size = gen8_stolen_size,
503 static const struct intel_early_ops gen9_early_ops __initconst = {
504 .stolen_base = gen3_stolen_base,
505 .stolen_size = gen9_stolen_size,
508 static const struct intel_early_ops chv_early_ops __initconst = {
509 .stolen_base = gen3_stolen_base,
510 .stolen_size = chv_stolen_size,
513 static const struct intel_early_ops gen11_early_ops __initconst = {
514 .stolen_base = gen11_stolen_base,
515 .stolen_size = gen9_stolen_size,
518 /* Intel integrated GPUs for which we need to reserve "stolen memory" */
519 static const struct pci_device_id intel_early_ids[] __initconst = {
520 INTEL_I830_IDS(&i830_early_ops),
521 INTEL_I845G_IDS(&i845_early_ops),
522 INTEL_I85X_IDS(&i85x_early_ops),
523 INTEL_I865G_IDS(&i865_early_ops),
524 INTEL_I915G_IDS(&gen3_early_ops),
525 INTEL_I915GM_IDS(&gen3_early_ops),
526 INTEL_I945G_IDS(&gen3_early_ops),
527 INTEL_I945GM_IDS(&gen3_early_ops),
528 INTEL_VLV_IDS(&gen6_early_ops),
529 INTEL_PINEVIEW_G_IDS(&gen3_early_ops),
530 INTEL_PINEVIEW_M_IDS(&gen3_early_ops),
531 INTEL_I965G_IDS(&gen3_early_ops),
532 INTEL_G33_IDS(&gen3_early_ops),
533 INTEL_I965GM_IDS(&gen3_early_ops),
534 INTEL_GM45_IDS(&gen3_early_ops),
535 INTEL_G45_IDS(&gen3_early_ops),
536 INTEL_IRONLAKE_D_IDS(&gen3_early_ops),
537 INTEL_IRONLAKE_M_IDS(&gen3_early_ops),
538 INTEL_SNB_D_IDS(&gen6_early_ops),
539 INTEL_SNB_M_IDS(&gen6_early_ops),
540 INTEL_IVB_M_IDS(&gen6_early_ops),
541 INTEL_IVB_D_IDS(&gen6_early_ops),
542 INTEL_HSW_IDS(&gen6_early_ops),
543 INTEL_BDW_IDS(&gen8_early_ops),
544 INTEL_CHV_IDS(&chv_early_ops),
545 INTEL_SKL_IDS(&gen9_early_ops),
546 INTEL_BXT_IDS(&gen9_early_ops),
547 INTEL_KBL_IDS(&gen9_early_ops),
548 INTEL_CFL_IDS(&gen9_early_ops),
549 INTEL_GLK_IDS(&gen9_early_ops),
550 INTEL_CNL_IDS(&gen9_early_ops),
551 INTEL_ICL_11_IDS(&gen11_early_ops),
552 INTEL_EHL_IDS(&gen11_early_ops),
553 INTEL_TGL_12_IDS(&gen11_early_ops),
554 INTEL_RKL_IDS(&gen11_early_ops),
557 struct resource intel_graphics_stolen_res __ro_after_init = DEFINE_RES_MEM(0, 0);
558 EXPORT_SYMBOL(intel_graphics_stolen_res);
561 intel_graphics_stolen(int num, int slot, int func,
562 const struct intel_early_ops *early_ops)
564 resource_size_t base, size;
567 size = early_ops->stolen_size(num, slot, func);
568 base = early_ops->stolen_base(num, slot, func, size);
573 end = base + size - 1;
575 intel_graphics_stolen_res.start = base;
576 intel_graphics_stolen_res.end = end;
578 printk(KERN_INFO "Reserving Intel graphics memory at %pR\n",
579 &intel_graphics_stolen_res);
581 /* Mark this space as reserved */
582 e820__range_add(base, size, E820_TYPE_RESERVED);
583 e820__update_table(e820_table);
586 static void __init intel_graphics_quirks(int num, int slot, int func)
588 const struct intel_early_ops *early_ops;
593 * Reserve "stolen memory" for an integrated GPU. If we've already
594 * found one, there's nothing to do for other (discrete) GPUs.
596 if (resource_size(&intel_graphics_stolen_res))
599 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
601 for (i = 0; i < ARRAY_SIZE(intel_early_ids); i++) {
602 kernel_ulong_t driver_data = intel_early_ids[i].driver_data;
604 if (intel_early_ids[i].device != device)
607 early_ops = (typeof(early_ops))driver_data;
609 intel_graphics_stolen(num, slot, func, early_ops);
615 static void __init force_disable_hpet(int num, int slot, int func)
617 #ifdef CONFIG_HPET_TIMER
618 boot_hpet_disable = true;
619 pr_info("x86/hpet: Will disable the HPET for this platform because it's not reliable\n");
623 #define BCM4331_MMIO_SIZE 16384
624 #define BCM4331_PM_CAP 0x40
625 #define bcma_aread32(reg) ioread32(mmio + 1 * BCMA_CORE_SIZE + reg)
626 #define bcma_awrite32(reg, val) iowrite32(val, mmio + 1 * BCMA_CORE_SIZE + reg)
628 static void __init apple_airport_reset(int bus, int slot, int func)
635 if (!x86_apple_machine)
638 /* Card may have been put into PCI_D3hot by grub quirk */
639 pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
641 if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
642 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
643 write_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL, pmcsr);
646 pmcsr = read_pci_config_16(bus, slot, func, BCM4331_PM_CAP + PCI_PM_CTRL);
647 if ((pmcsr & PCI_PM_CTRL_STATE_MASK) != PCI_D0) {
648 pr_err("pci 0000:%02x:%02x.%d: Cannot power up Apple AirPort card\n",
654 addr = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0);
655 addr |= (u64)read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_1) << 32;
656 addr &= PCI_BASE_ADDRESS_MEM_MASK;
658 mmio = early_ioremap(addr, BCM4331_MMIO_SIZE);
660 pr_err("pci 0000:%02x:%02x.%d: Cannot iomap Apple AirPort card\n",
665 pr_info("Resetting Apple AirPort card (left enabled by EFI)\n");
667 for (i = 0; bcma_aread32(BCMA_RESET_ST) && i < 30; i++)
670 bcma_awrite32(BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
671 bcma_aread32(BCMA_RESET_CTL);
674 bcma_awrite32(BCMA_RESET_CTL, 0);
675 bcma_aread32(BCMA_RESET_CTL);
678 early_iounmap(mmio, BCM4331_MMIO_SIZE);
681 #define QFLAG_APPLY_ONCE 0x1
682 #define QFLAG_APPLIED 0x2
683 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
690 void (*f)(int num, int slot, int func);
693 static struct chipset early_qrk[] __initdata = {
694 { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
695 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
696 { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
697 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
698 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
699 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
700 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
701 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
702 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
703 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
704 { PCI_VENDOR_ID_INTEL, 0x3403, PCI_CLASS_BRIDGE_HOST,
705 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
706 { PCI_VENDOR_ID_INTEL, 0x3405, PCI_CLASS_BRIDGE_HOST,
707 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
708 { PCI_VENDOR_ID_INTEL, 0x3406, PCI_CLASS_BRIDGE_HOST,
709 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
710 { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, PCI_ANY_ID,
711 0, intel_graphics_quirks },
713 * HPET on the current version of the Baytrail platform has accuracy
714 * problems: it will halt in deep idle state - so we disable it.
716 * More details can be found in section 18.10.1.3 of the datasheet:
718 * http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/atom-z8000-datasheet-vol-1.pdf
720 { PCI_VENDOR_ID_INTEL, 0x0f00,
721 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
722 { PCI_VENDOR_ID_BROADCOM, 0x4331,
723 PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset},
727 static void __init early_pci_scan_bus(int bus);
730 * check_dev_quirk - apply early quirks to a given PCI device
733 * @func: PCI function
735 * Check the vendor & device ID against the early quirks table.
737 * If the device is single function, let early_pci_scan_bus() know so we don't
738 * poke at this device again.
740 static int __init check_dev_quirk(int num, int slot, int func)
749 class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
752 return -1; /* no class, treat as single function */
754 vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
756 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
758 for (i = 0; early_qrk[i].f != NULL; i++) {
759 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
760 (early_qrk[i].vendor == vendor)) &&
761 ((early_qrk[i].device == PCI_ANY_ID) ||
762 (early_qrk[i].device == device)) &&
763 (!((early_qrk[i].class ^ class) &
764 early_qrk[i].class_mask))) {
765 if ((early_qrk[i].flags &
766 QFLAG_DONE) != QFLAG_DONE)
767 early_qrk[i].f(num, slot, func);
768 early_qrk[i].flags |= QFLAG_APPLIED;
772 type = read_pci_config_byte(num, slot, func,
775 if ((type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
776 sec = read_pci_config_byte(num, slot, func, PCI_SECONDARY_BUS);
778 early_pci_scan_bus(sec);
787 static void __init early_pci_scan_bus(int bus)
791 /* Poor man's PCI discovery */
792 for (slot = 0; slot < 32; slot++)
793 for (func = 0; func < 8; func++) {
794 /* Only probe function 0 on single fn devices */
795 if (check_dev_quirk(bus, slot, func))
800 void __init early_quirks(void)
802 if (!early_pci_allowed())
805 early_pci_scan_bus(0);