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/pci_ids.h>
15 #include <drm/i915_drm.h>
16 #include <asm/pci-direct.h>
18 #include <asm/io_apic.h>
21 #include <asm/iommu.h>
23 #include <asm/irq_remapping.h>
25 static void __init fix_hypertransport_config(int num, int slot, int func)
29 * we found a hypertransport bus
30 * make sure that we are broadcasting
31 * interrupts to all cpus on the ht bus
32 * if we're using extended apic ids
34 htcfg = read_pci_config(num, slot, func, 0x68);
35 if (htcfg & (1 << 18)) {
36 printk(KERN_INFO "Detected use of extended apic ids "
37 "on hypertransport bus\n");
38 if ((htcfg & (1 << 17)) == 0) {
39 printk(KERN_INFO "Enabling hypertransport extended "
40 "apic interrupt broadcast\n");
41 printk(KERN_INFO "Note this is a bios bug, "
42 "please contact your hw vendor\n");
44 write_pci_config(num, slot, func, 0x68, htcfg);
51 static void __init via_bugs(int num, int slot, int func)
53 #ifdef CONFIG_GART_IOMMU
54 if ((max_pfn > MAX_DMA32_PFN || force_iommu) &&
55 !gart_iommu_aperture_allowed) {
57 "Looks like a VIA chipset. Disabling IOMMU."
58 " Override with iommu=allowed\n");
59 gart_iommu_aperture_disabled = 1;
65 #ifdef CONFIG_X86_IO_APIC
67 static int __init nvidia_hpet_check(struct acpi_table_header *header)
71 #endif /* CONFIG_X86_IO_APIC */
72 #endif /* CONFIG_ACPI */
74 static void __init nvidia_bugs(int num, int slot, int func)
77 #ifdef CONFIG_X86_IO_APIC
79 * All timer overrides on Nvidia are
80 * wrong unless HPET is enabled.
81 * Unfortunately that's not true on many Asus boards.
82 * We don't know yet how to detect this automatically, but
83 * at least allow a command line override.
85 if (acpi_use_timer_override)
88 if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
89 acpi_skip_timer_override = 1;
90 printk(KERN_INFO "Nvidia board "
91 "detected. Ignoring ACPI "
93 printk(KERN_INFO "If you got timer trouble "
94 "try acpi_use_timer_override\n");
98 /* RED-PEN skip them on mptables too? */
102 #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
103 static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
108 b = read_pci_config_byte(num, slot, func, 0xac);
110 write_pci_config_byte(num, slot, func, 0xac, b);
112 d = read_pci_config(num, slot, func, 0x70);
114 write_pci_config(num, slot, func, 0x70, d);
116 d = read_pci_config(num, slot, func, 0x8);
121 static void __init ati_bugs(int num, int slot, int func)
126 if (acpi_use_timer_override)
129 d = ati_ixp4x0_rev(num, slot, func);
131 acpi_skip_timer_override = 1;
133 /* check for IRQ0 interrupt swap */
134 outb(0x72, 0xcd6); b = inb(0xcd7);
136 acpi_skip_timer_override = 1;
139 if (acpi_skip_timer_override) {
140 printk(KERN_INFO "SB4X0 revision 0x%x\n", d);
141 printk(KERN_INFO "Ignoring ACPI timer override.\n");
142 printk(KERN_INFO "If you got timer trouble "
143 "try acpi_use_timer_override\n");
147 static u32 __init ati_sbx00_rev(int num, int slot, int func)
151 d = read_pci_config(num, slot, func, 0x8);
157 static void __init ati_bugs_contd(int num, int slot, int func)
161 rev = ati_sbx00_rev(num, slot, func);
163 acpi_fix_pin2_polarity = 1;
166 * SB600: revisions 0x11, 0x12, 0x13, 0x14, ...
167 * SB700: revisions 0x39, 0x3a, ...
168 * SB800: revisions 0x40, 0x41, ...
173 if (acpi_use_timer_override)
176 /* check for IRQ0 interrupt swap */
177 d = read_pci_config(num, slot, func, 0x64);
179 acpi_skip_timer_override = 1;
181 if (acpi_skip_timer_override) {
182 printk(KERN_INFO "SB600 revision 0x%x\n", rev);
183 printk(KERN_INFO "Ignoring ACPI timer override.\n");
184 printk(KERN_INFO "If you got timer trouble "
185 "try acpi_use_timer_override\n");
189 static void __init ati_bugs(int num, int slot, int func)
193 static void __init ati_bugs_contd(int num, int slot, int func)
198 static void __init intel_remapping_check(int num, int slot, int func)
203 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
204 revision = read_pci_config_byte(num, slot, func, PCI_REVISION_ID);
207 * Revision <= 13 of all triggering devices id in this quirk
208 * have a problem draining interrupts when irq remapping is
209 * enabled, and should be flagged as broken. Additionally
210 * revision 0x22 of device id 0x3405 has this problem.
212 if (revision <= 0x13)
213 set_irq_remapping_broken();
214 else if (device == 0x3405 && revision == 0x22)
215 set_irq_remapping_broken();
219 * Systems with Intel graphics controllers set aside memory exclusively
220 * for gfx driver use. This memory is not marked in the E820 as reserved
221 * or as RAM, and so is subject to overlap from E820 manipulation later
222 * in the boot process. On some systems, MMIO space is allocated on top,
223 * despite the efforts of the "RAM buffer" approach, which simply rounds
224 * memory boundaries up to 64M to try to catch space that may decode
225 * as RAM and so is not suitable for MMIO.
227 * And yes, so far on current devices the base addr is always under 4G.
229 static u32 __init intel_stolen_base(int num, int slot, int func, size_t stolen_size)
234 * For the PCI IDs in this quirk, the stolen base is always
235 * in 0x5c, aka the BDSM register (yes that's really what
238 base = read_pci_config(num, slot, func, 0x5c);
239 base &= ~((1<<20) - 1);
244 #define KB(x) ((x) * 1024UL)
245 #define MB(x) (KB (KB (x)))
246 #define GB(x) (MB (KB (x)))
248 static size_t __init i830_tseg_size(void)
250 u8 tmp = read_pci_config_byte(0, 0, 0, I830_ESMRAMC);
252 if (!(tmp & TSEG_ENABLE))
255 if (tmp & I830_TSEG_SIZE_1M)
261 static size_t __init i845_tseg_size(void)
263 u8 tmp = read_pci_config_byte(0, 0, 0, I845_ESMRAMC);
265 if (!(tmp & TSEG_ENABLE))
268 switch (tmp & I845_TSEG_SIZE_MASK) {
269 case I845_TSEG_SIZE_512K:
271 case I845_TSEG_SIZE_1M:
279 static size_t __init i85x_tseg_size(void)
281 u8 tmp = read_pci_config_byte(0, 0, 0, I85X_ESMRAMC);
283 if (!(tmp & TSEG_ENABLE))
289 static size_t __init i830_mem_size(void)
291 return read_pci_config_byte(0, 0, 0, I830_DRB3) * MB(32);
294 static size_t __init i85x_mem_size(void)
296 return read_pci_config_byte(0, 0, 1, I85X_DRB3) * MB(32);
300 * On 830/845/85x the stolen memory base isn't available in any
301 * register. We need to calculate it as TOM-TSEG_SIZE-stolen_size.
303 static u32 __init i830_stolen_base(int num, int slot, int func, size_t stolen_size)
305 return i830_mem_size() - i830_tseg_size() - stolen_size;
308 static u32 __init i845_stolen_base(int num, int slot, int func, size_t stolen_size)
310 return i830_mem_size() - i845_tseg_size() - stolen_size;
313 static u32 __init i85x_stolen_base(int num, int slot, int func, size_t stolen_size)
315 return i85x_mem_size() - i85x_tseg_size() - stolen_size;
318 static u32 __init i865_stolen_base(int num, int slot, int func, size_t stolen_size)
321 * FIXME is the graphics stolen memory region
322 * always at TOUD? Ie. is it always the last
323 * one to be allocated by the BIOS?
325 return read_pci_config_16(0, 0, 0, I865_TOUD) << 16;
328 static size_t __init i830_stolen_size(int num, int slot, int func)
333 gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
335 switch (gmch_ctrl & I830_GMCH_GMS_MASK) {
336 case I830_GMCH_GMS_STOLEN_512:
337 stolen_size = KB(512);
339 case I830_GMCH_GMS_STOLEN_1024:
342 case I830_GMCH_GMS_STOLEN_8192:
345 case I830_GMCH_GMS_LOCAL:
346 /* local memory isn't part of the normal address space */
356 static size_t __init gen3_stolen_size(int num, int slot, int func)
361 gmch_ctrl = read_pci_config_16(0, 0, 0, I830_GMCH_CTRL);
363 switch (gmch_ctrl & I855_GMCH_GMS_MASK) {
364 case I855_GMCH_GMS_STOLEN_1M:
367 case I855_GMCH_GMS_STOLEN_4M:
370 case I855_GMCH_GMS_STOLEN_8M:
373 case I855_GMCH_GMS_STOLEN_16M:
374 stolen_size = MB(16);
376 case I855_GMCH_GMS_STOLEN_32M:
377 stolen_size = MB(32);
379 case I915_GMCH_GMS_STOLEN_48M:
380 stolen_size = MB(48);
382 case I915_GMCH_GMS_STOLEN_64M:
383 stolen_size = MB(64);
385 case G33_GMCH_GMS_STOLEN_128M:
386 stolen_size = MB(128);
388 case G33_GMCH_GMS_STOLEN_256M:
389 stolen_size = MB(256);
391 case INTEL_GMCH_GMS_STOLEN_96M:
392 stolen_size = MB(96);
394 case INTEL_GMCH_GMS_STOLEN_160M:
395 stolen_size = MB(160);
397 case INTEL_GMCH_GMS_STOLEN_224M:
398 stolen_size = MB(224);
400 case INTEL_GMCH_GMS_STOLEN_352M:
401 stolen_size = MB(352);
411 static size_t __init gen6_stolen_size(int num, int slot, int func)
415 gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
416 gmch_ctrl >>= SNB_GMCH_GMS_SHIFT;
417 gmch_ctrl &= SNB_GMCH_GMS_MASK;
419 return gmch_ctrl << 25; /* 32 MB units */
422 static size_t __init gen8_stolen_size(int num, int slot, int func)
426 gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
427 gmch_ctrl >>= BDW_GMCH_GMS_SHIFT;
428 gmch_ctrl &= BDW_GMCH_GMS_MASK;
429 return gmch_ctrl << 25; /* 32 MB units */
432 static size_t __init chv_stolen_size(int num, int slot, int func)
436 gmch_ctrl = read_pci_config_16(num, slot, func, SNB_GMCH_CTRL);
437 gmch_ctrl >>= SNB_GMCH_GMS_SHIFT;
438 gmch_ctrl &= SNB_GMCH_GMS_MASK;
441 * 0x0 to 0x10: 32MB increments starting at 0MB
442 * 0x11 to 0x16: 4MB increments starting at 8MB
443 * 0x17 to 0x1d: 4MB increments start at 36MB
445 if (gmch_ctrl < 0x11)
446 return gmch_ctrl << 25;
447 else if (gmch_ctrl < 0x17)
448 return (gmch_ctrl - 0x11 + 2) << 22;
450 return (gmch_ctrl - 0x17 + 9) << 22;
453 struct intel_stolen_funcs {
454 size_t (*size)(int num, int slot, int func);
455 u32 (*base)(int num, int slot, int func, size_t size);
458 static const struct intel_stolen_funcs i830_stolen_funcs __initconst = {
459 .base = i830_stolen_base,
460 .size = i830_stolen_size,
463 static const struct intel_stolen_funcs i845_stolen_funcs __initconst = {
464 .base = i845_stolen_base,
465 .size = i830_stolen_size,
468 static const struct intel_stolen_funcs i85x_stolen_funcs __initconst = {
469 .base = i85x_stolen_base,
470 .size = gen3_stolen_size,
473 static const struct intel_stolen_funcs i865_stolen_funcs __initconst = {
474 .base = i865_stolen_base,
475 .size = gen3_stolen_size,
478 static const struct intel_stolen_funcs gen3_stolen_funcs __initconst = {
479 .base = intel_stolen_base,
480 .size = gen3_stolen_size,
483 static const struct intel_stolen_funcs gen6_stolen_funcs __initconst = {
484 .base = intel_stolen_base,
485 .size = gen6_stolen_size,
488 static const struct intel_stolen_funcs gen8_stolen_funcs __initconst = {
489 .base = intel_stolen_base,
490 .size = gen8_stolen_size,
493 static const struct intel_stolen_funcs chv_stolen_funcs __initconst = {
494 .base = intel_stolen_base,
495 .size = chv_stolen_size,
498 static const struct pci_device_id intel_stolen_ids[] __initconst = {
499 INTEL_I830_IDS(&i830_stolen_funcs),
500 INTEL_I845G_IDS(&i845_stolen_funcs),
501 INTEL_I85X_IDS(&i85x_stolen_funcs),
502 INTEL_I865G_IDS(&i865_stolen_funcs),
503 INTEL_I915G_IDS(&gen3_stolen_funcs),
504 INTEL_I915GM_IDS(&gen3_stolen_funcs),
505 INTEL_I945G_IDS(&gen3_stolen_funcs),
506 INTEL_I945GM_IDS(&gen3_stolen_funcs),
507 INTEL_VLV_M_IDS(&gen6_stolen_funcs),
508 INTEL_VLV_D_IDS(&gen6_stolen_funcs),
509 INTEL_PINEVIEW_IDS(&gen3_stolen_funcs),
510 INTEL_I965G_IDS(&gen3_stolen_funcs),
511 INTEL_G33_IDS(&gen3_stolen_funcs),
512 INTEL_I965GM_IDS(&gen3_stolen_funcs),
513 INTEL_GM45_IDS(&gen3_stolen_funcs),
514 INTEL_G45_IDS(&gen3_stolen_funcs),
515 INTEL_IRONLAKE_D_IDS(&gen3_stolen_funcs),
516 INTEL_IRONLAKE_M_IDS(&gen3_stolen_funcs),
517 INTEL_SNB_D_IDS(&gen6_stolen_funcs),
518 INTEL_SNB_M_IDS(&gen6_stolen_funcs),
519 INTEL_IVB_M_IDS(&gen6_stolen_funcs),
520 INTEL_IVB_D_IDS(&gen6_stolen_funcs),
521 INTEL_HSW_D_IDS(&gen6_stolen_funcs),
522 INTEL_HSW_M_IDS(&gen6_stolen_funcs),
523 INTEL_BDW_M_IDS(&gen8_stolen_funcs),
524 INTEL_BDW_D_IDS(&gen8_stolen_funcs),
525 INTEL_CHV_IDS(&chv_stolen_funcs),
528 static void __init intel_graphics_stolen(int num, int slot, int func)
533 u16 device, subvendor, subdevice;
535 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
536 subvendor = read_pci_config_16(num, slot, func,
537 PCI_SUBSYSTEM_VENDOR_ID);
538 subdevice = read_pci_config_16(num, slot, func, PCI_SUBSYSTEM_ID);
540 for (i = 0; i < ARRAY_SIZE(intel_stolen_ids); i++) {
541 if (intel_stolen_ids[i].device == device) {
542 const struct intel_stolen_funcs *stolen_funcs =
543 (const struct intel_stolen_funcs *)intel_stolen_ids[i].driver_data;
544 size = stolen_funcs->size(num, slot, func);
545 start = stolen_funcs->base(num, slot, func, size);
547 printk(KERN_INFO "Reserving Intel graphics stolen memory at 0x%x-0x%x\n",
548 start, start + (u32)size - 1);
549 /* Mark this space as reserved */
550 e820_add_region(start, size, E820_RESERVED);
551 sanitize_e820_map(e820.map,
552 ARRAY_SIZE(e820.map),
560 static void __init force_disable_hpet(int num, int slot, int func)
562 #ifdef CONFIG_HPET_TIMER
563 boot_hpet_disable = 1;
564 pr_info("x86/hpet: Will disable the HPET for this platform because it's not reliable\n");
569 #define QFLAG_APPLY_ONCE 0x1
570 #define QFLAG_APPLIED 0x2
571 #define QFLAG_DONE (QFLAG_APPLY_ONCE|QFLAG_APPLIED)
578 void (*f)(int num, int slot, int func);
582 * Only works for devices on the root bus. If you add any devices
583 * not on bus 0 readd another loop level in early_quirks(). But
584 * be careful because at least the Nvidia quirk here relies on
585 * only matching on bus 0.
587 static struct chipset early_qrk[] __initdata = {
588 { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
589 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
590 { PCI_VENDOR_ID_VIA, PCI_ANY_ID,
591 PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, via_bugs },
592 { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
593 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, fix_hypertransport_config },
594 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
595 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs },
596 { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
597 PCI_CLASS_SERIAL_SMBUS, PCI_ANY_ID, 0, ati_bugs_contd },
598 { PCI_VENDOR_ID_INTEL, 0x3403, PCI_CLASS_BRIDGE_HOST,
599 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
600 { PCI_VENDOR_ID_INTEL, 0x3405, PCI_CLASS_BRIDGE_HOST,
601 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
602 { PCI_VENDOR_ID_INTEL, 0x3406, PCI_CLASS_BRIDGE_HOST,
603 PCI_BASE_CLASS_BRIDGE, 0, intel_remapping_check },
604 { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA, PCI_ANY_ID,
605 QFLAG_APPLY_ONCE, intel_graphics_stolen },
607 * HPET on current version of Baytrail platform has accuracy
608 * problems, disable it for now:
610 { PCI_VENDOR_ID_INTEL, 0x0f00,
611 PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
616 * check_dev_quirk - apply early quirks to a given PCI device
619 * @func: PCI function
621 * Check the vendor & device ID against the early quirks table.
623 * If the device is single function, let early_quirks() know so we don't
624 * poke at this device again.
626 static int __init check_dev_quirk(int num, int slot, int func)
634 class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
637 return -1; /* no class, treat as single function */
639 vendor = read_pci_config_16(num, slot, func, PCI_VENDOR_ID);
641 device = read_pci_config_16(num, slot, func, PCI_DEVICE_ID);
643 for (i = 0; early_qrk[i].f != NULL; i++) {
644 if (((early_qrk[i].vendor == PCI_ANY_ID) ||
645 (early_qrk[i].vendor == vendor)) &&
646 ((early_qrk[i].device == PCI_ANY_ID) ||
647 (early_qrk[i].device == device)) &&
648 (!((early_qrk[i].class ^ class) &
649 early_qrk[i].class_mask))) {
650 if ((early_qrk[i].flags &
651 QFLAG_DONE) != QFLAG_DONE)
652 early_qrk[i].f(num, slot, func);
653 early_qrk[i].flags |= QFLAG_APPLIED;
657 type = read_pci_config_byte(num, slot, func,
665 void __init early_quirks(void)
669 if (!early_pci_allowed())
672 /* Poor man's PCI discovery */
673 /* Only scan the root bus */
674 for (slot = 0; slot < 32; slot++)
675 for (func = 0; func < 8; func++) {
676 /* Only probe function 0 on single fn devices */
677 if (check_dev_quirk(0, slot, func))