quirks.c
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- /*
- * $Id: quirks.c,v 1.5 1998/05/02 19:24:14 mj Exp $
- *
- * This file contains work-arounds for many known PCI hardware
- * bugs. Devices present only on certain architectures (host
- * bridges et cetera) should be handled in arch-specific code.
- *
- * Copyright (c) 1999 Martin Mares <mj@ucw.cz>
- *
- * The bridge optimization stuff has been removed. If you really
- * have a silly BIOS which is unable to set your host bridge right,
- * use the PowerTweak utility (see http://powertweak.sourceforge.net).
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #undef DEBUG
- /* Deal with broken BIOS'es that neglect to enable passive release,
- which can cause problems in combination with the 82441FX/PPro MTRRs */
- static void __init quirk_passive_release(struct pci_dev *dev)
- {
- struct pci_dev *d = NULL;
- unsigned char dlc;
- /* We have to make sure a particular bit is set in the PIIX3
- ISA bridge, so we have to go out and find it. */
- while ((d = pci_find_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0, d))) {
- pci_read_config_byte(d, 0x82, &dlc);
- if (!(dlc & 1<<1)) {
- printk(KERN_ERR "PCI: PIIX3: Enabling Passive Release on %sn", d->slot_name);
- dlc |= 1<<1;
- pci_write_config_byte(d, 0x82, dlc);
- }
- }
- }
- /* The VIA VP2/VP3/MVP3 seem to have some 'features'. There may be a workaround
- but VIA don't answer queries. If you happen to have good contacts at VIA
- ask them for me please -- Alan
-
- This appears to be BIOS not version dependent. So presumably there is a
- chipset level fix */
-
- int isa_dma_bridge_buggy; /* Exported */
-
- static void __init quirk_isa_dma_hangs(struct pci_dev *dev)
- {
- if (!isa_dma_bridge_buggy) {
- isa_dma_bridge_buggy=1;
- printk(KERN_INFO "Activating ISA DMA hang workarounds.n");
- }
- }
- int pci_pci_problems;
- /*
- * Chipsets where PCI->PCI transfers vanish or hang
- */
- static void __init quirk_nopcipci(struct pci_dev *dev)
- {
- if((pci_pci_problems&PCIPCI_FAIL)==0)
- {
- printk(KERN_INFO "Disabling direct PCI/PCI transfers.n");
- pci_pci_problems|=PCIPCI_FAIL;
- }
- }
- /*
- * Triton requires workarounds to be used by the drivers
- */
-
- static void __init quirk_triton(struct pci_dev *dev)
- {
- if((pci_pci_problems&PCIPCI_TRITON)==0)
- {
- printk(KERN_INFO "Limiting direct PCI/PCI transfers.n");
- pci_pci_problems|=PCIPCI_TRITON;
- }
- }
- /*
- * VIA Apollo KT133 needs PCI latency patch
- * Made according to a windows driver based patch by George E. Breese
- * see PCI Latency Adjust on http://www.viahardware.com/download/viatweak.shtm
- * Also see http://home.tiscalinet.de/au-ja/review-kt133a-1-en.html for
- * the info on which Mr Breese based his work.
- *
- * Updated based on further information from the site and also on
- * information provided by VIA
- */
- static void __init quirk_vialatency(struct pci_dev *dev)
- {
- struct pci_dev *p;
- u8 rev;
- u8 busarb;
- /* Ok we have a potential problem chipset here. Now see if we have
- a buggy southbridge */
-
- p=pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, NULL);
- if(p!=NULL)
- {
- pci_read_config_byte(p, PCI_CLASS_REVISION, &rev);
- /* 0x40 - 0x4f == 686B, 0x10 - 0x2f == 686A; thanks Dan Hollis */
- /* Check for buggy part revisions */
- if (rev < 0x40 || rev > 0x42)
- return;
- }
- else
- {
- p = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL);
- if(p==NULL) /* No problem parts */
- return;
- pci_read_config_byte(p, PCI_CLASS_REVISION, &rev);
- /* Check for buggy part revisions */
- if (rev < 0x10 || rev > 0x12)
- return;
- }
-
- /*
- * Ok we have the problem. Now set the PCI master grant to
- * occur every master grant. The apparent bug is that under high
- * PCI load (quite common in Linux of course) you can get data
- * loss when the CPU is held off the bus for 3 bus master requests
- * This happens to include the IDE controllers....
- *
- * VIA only apply this fix when an SB Live! is present but under
- * both Linux and Windows this isnt enough, and we have seen
- * corruption without SB Live! but with things like 3 UDMA IDE
- * controllers. So we ignore that bit of the VIA recommendation..
- */
- pci_read_config_byte(dev, 0x76, &busarb);
- /* Set bit 4 and bi 5 of byte 76 to 0x01
- "Master priority rotation on every PCI master grant */
- busarb &= ~(1<<5);
- busarb |= (1<<4);
- pci_write_config_byte(dev, 0x76, busarb);
- printk(KERN_INFO "Applying VIA southbridge workaround.n");
- }
- /*
- * VIA Apollo VP3 needs ETBF on BT848/878
- */
-
- static void __init quirk_viaetbf(struct pci_dev *dev)
- {
- if((pci_pci_problems&PCIPCI_VIAETBF)==0)
- {
- printk(KERN_INFO "Limiting direct PCI/PCI transfers.n");
- pci_pci_problems|=PCIPCI_VIAETBF;
- }
- }
- static void __init quirk_vsfx(struct pci_dev *dev)
- {
- if((pci_pci_problems&PCIPCI_VSFX)==0)
- {
- printk(KERN_INFO "Limiting direct PCI/PCI transfers.n");
- pci_pci_problems|=PCIPCI_VSFX;
- }
- }
- /*
- * Natoma has some interesting boundary conditions with Zoran stuff
- * at least
- */
-
- static void __init quirk_natoma(struct pci_dev *dev)
- {
- if((pci_pci_problems&PCIPCI_NATOMA)==0)
- {
- printk(KERN_INFO "Limiting direct PCI/PCI transfers.n");
- pci_pci_problems|=PCIPCI_NATOMA;
- }
- }
- /*
- * S3 868 and 968 chips report region size equal to 32M, but they decode 64M.
- * If it's needed, re-allocate the region.
- */
- static void __init quirk_s3_64M(struct pci_dev *dev)
- {
- struct resource *r = &dev->resource[0];
- if ((r->start & 0x3ffffff) || r->end != r->start + 0x3ffffff) {
- r->start = 0;
- r->end = 0x3ffffff;
- }
- }
- static void __init quirk_io_region(struct pci_dev *dev, unsigned region, unsigned size, int nr)
- {
- region &= ~(size-1);
- if (region) {
- struct resource *res = dev->resource + nr;
- res->name = dev->name;
- res->start = region;
- res->end = region + size - 1;
- res->flags = IORESOURCE_IO;
- pci_claim_resource(dev, nr);
- }
- }
- /*
- * Let's make the southbridge information explicit instead
- * of having to worry about people probing the ACPI areas,
- * for example.. (Yes, it happens, and if you read the wrong
- * ACPI register it will put the machine to sleep with no
- * way of waking it up again. Bummer).
- *
- * ALI M7101: Two IO regions pointed to by words at
- * 0xE0 (64 bytes of ACPI registers)
- * 0xE2 (32 bytes of SMB registers)
- */
- static void __init quirk_ali7101_acpi(struct pci_dev *dev)
- {
- u16 region;
- pci_read_config_word(dev, 0xE0, ®ion);
- quirk_io_region(dev, region, 64, PCI_BRIDGE_RESOURCES);
- pci_read_config_word(dev, 0xE2, ®ion);
- quirk_io_region(dev, region, 32, PCI_BRIDGE_RESOURCES+1);
- }
- /*
- * PIIX4 ACPI: Two IO regions pointed to by longwords at
- * 0x40 (64 bytes of ACPI registers)
- * 0x90 (32 bytes of SMB registers)
- */
- static void __init quirk_piix4_acpi(struct pci_dev *dev)
- {
- u32 region;
- pci_read_config_dword(dev, 0x40, ®ion);
- quirk_io_region(dev, region, 64, PCI_BRIDGE_RESOURCES);
- pci_read_config_dword(dev, 0x90, ®ion);
- quirk_io_region(dev, region, 32, PCI_BRIDGE_RESOURCES+1);
- }
- /*
- * VIA ACPI: One IO region pointed to by longword at
- * 0x48 or 0x20 (256 bytes of ACPI registers)
- */
- static void __init quirk_vt82c586_acpi(struct pci_dev *dev)
- {
- u8 rev;
- u32 region;
- pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
- if (rev & 0x10) {
- pci_read_config_dword(dev, 0x48, ®ion);
- region &= PCI_BASE_ADDRESS_IO_MASK;
- quirk_io_region(dev, region, 256, PCI_BRIDGE_RESOURCES);
- }
- }
- /*
- * VIA VT82C686 ACPI: Three IO region pointed to by (long)words at
- * 0x48 (256 bytes of ACPI registers)
- * 0x70 (128 bytes of hardware monitoring register)
- * 0x90 (16 bytes of SMB registers)
- */
- static void __init quirk_vt82c686_acpi(struct pci_dev *dev)
- {
- u16 hm;
- u32 smb;
- quirk_vt82c586_acpi(dev);
- pci_read_config_word(dev, 0x70, &hm);
- hm &= PCI_BASE_ADDRESS_IO_MASK;
- quirk_io_region(dev, hm, 128, PCI_BRIDGE_RESOURCES + 1);
- pci_read_config_dword(dev, 0x90, &smb);
- smb &= PCI_BASE_ADDRESS_IO_MASK;
- quirk_io_region(dev, smb, 16, PCI_BRIDGE_RESOURCES + 2);
- }
- #ifdef CONFIG_X86_IO_APIC
- extern int nr_ioapics;
- /*
- * VIA 686A/B: If an IO-APIC is active, we need to route all on-chip
- * devices to the external APIC.
- *
- * TODO: When we have device-specific interrupt routers,
- * this code will go away from quirks.
- */
- static void __init quirk_via_ioapic(struct pci_dev *dev)
- {
- u8 tmp;
-
- if (nr_ioapics < 1)
- tmp = 0; /* nothing routed to external APIC */
- else
- tmp = 0x1f; /* all known bits (4-0) routed to external APIC */
-
- printk(KERN_INFO "PCI: %sbling Via external APIC routingn",
- tmp == 0 ? "Disa" : "Ena");
- /* Offset 0x58: External APIC IRQ output control */
- pci_write_config_byte (dev, 0x58, tmp);
- }
- #endif /* CONFIG_X86_IO_APIC */
- /*
- * Via 686A/B: The PCI_INTERRUPT_LINE register for the on-chip
- * devices, USB0/1, AC97, MC97, and ACPI, has an unusual feature:
- * when written, it makes an internal connection to the PIC.
- * For these devices, this register is defined to be 4 bits wide.
- * Normally this is fine. However for IO-APIC motherboards, or
- * non-x86 architectures (yes Via exists on PPC among other places),
- * we must mask the PCI_INTERRUPT_LINE value versus 0xf to get
- * interrupts delivered properly.
- *
- * TODO: When we have device-specific interrupt routers,
- * quirk_via_irqpic will go away from quirks.
- */
- /*
- * FIXME: it is questionable that quirk_via_acpi
- * is needed. It shows up as an ISA bridge, and does not
- * support the PCI_INTERRUPT_LINE register at all. Therefore
- * it seems like setting the pci_dev's 'irq' to the
- * value of the ACPI SCI interrupt is only done for convenience.
- * -jgarzik
- */
- static void __init quirk_via_acpi(struct pci_dev *d)
- {
- /*
- * VIA ACPI device: SCI IRQ line in PCI config byte 0x42
- */
- u8 irq;
- pci_read_config_byte(d, 0x42, &irq);
- irq &= 0xf;
- if (irq && (irq != 2))
- d->irq = irq;
- }
- static void __init quirk_via_irqpic(struct pci_dev *dev)
- {
- u8 irq, new_irq = dev->irq & 0xf;
- pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
- if (new_irq != irq) {
- printk(KERN_INFO "PCI: Via IRQ fixup for %s, from %d to %dn",
- dev->slot_name, irq, new_irq);
- udelay(15);
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, new_irq);
- }
- }
- /*
- * PIIX3 USB: We have to disable USB interrupts that are
- * hardwired to PIRQD# and may be shared with an
- * external device.
- *
- * Legacy Support Register (LEGSUP):
- * bit13: USB PIRQ Enable (USBPIRQDEN),
- * bit4: Trap/SMI On IRQ Enable (USBSMIEN).
- *
- * We mask out all r/wc bits, too.
- */
- static void __init quirk_piix3_usb(struct pci_dev *dev)
- {
- u16 legsup;
- pci_read_config_word(dev, 0xc0, &legsup);
- legsup &= 0x50ef;
- pci_write_config_word(dev, 0xc0, legsup);
- }
- /*
- * VIA VT82C598 has its device ID settable and many BIOSes
- * set it to the ID of VT82C597 for backward compatibility.
- * We need to switch it off to be able to recognize the real
- * type of the chip.
- */
- static void __init quirk_vt82c598_id(struct pci_dev *dev)
- {
- pci_write_config_byte(dev, 0xfc, 0);
- pci_read_config_word(dev, PCI_DEVICE_ID, &dev->device);
- }
- /*
- * CardBus controllers have a legacy base address that enables them
- * to respond as i82365 pcmcia controllers. We don't want them to
- * do this even if the Linux CardBus driver is not loaded, because
- * the Linux i82365 driver does not (and should not) handle CardBus.
- */
- static void __init quirk_cardbus_legacy(struct pci_dev *dev)
- {
- if ((PCI_CLASS_BRIDGE_CARDBUS << 8) ^ dev->class)
- return;
- pci_write_config_dword(dev, PCI_CB_LEGACY_MODE_BASE, 0);
- }
- /*
- * The AMD io apic can hang the box when an apic irq is masked.
- * We check all revs >= B0 (yet not in the pre production!) as the bug
- * is currently marked NoFix
- *
- * We have multiple reports of hangs with this chipset that went away with
- * noapic specified. For the moment we assume its the errata. We may be wrong
- * of course. However the advice is demonstrably good even if so..
- */
-
- static void __init quirk_amd_ioapic(struct pci_dev *dev)
- {
- u8 rev;
- pci_read_config_byte(dev, PCI_REVISION_ID, &rev);
- if(rev >= 0x02)
- {
- printk(KERN_WARNING "I/O APIC: AMD Errata #22 may be present. In the event of instability tryn");
- printk(KERN_WARNING " : booting with the "noapic" option.n");
- }
- }
- /*
- * Following the PCI ordering rules is optional on the AMD762. I'm not
- * sure what the designers were smoking but let's not inhale...
- *
- * To be fair to AMD, it follows the spec by default, its BIOS people
- * who turn it off!
- */
-
- static void __init quirk_amd_ordering(struct pci_dev *dev)
- {
- u32 pcic;
- pci_read_config_dword(dev, 0x4C, &pcic);
- if((pcic&6)!=6)
- {
- pcic |= 6;
- printk(KERN_WARNING "BIOS failed to enable PCI standards compliance, fixing this error.n");
- pci_write_config_dword(dev, 0x4C, pcic);
- pci_read_config_dword(dev, 0x84, &pcic);
- pcic |= (1<<23); /* Required in this mode */
- pci_write_config_dword(dev, 0x84, pcic);
- }
- }
- /*
- * The main table of quirks.
- */
- static struct pci_fixup pci_fixups[] __initdata = {
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441, quirk_passive_release },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441, quirk_passive_release },
- /*
- * Its not totally clear which chipsets are the problematic ones
- * We know 82C586 and 82C596 variants are affected.
- */
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0, quirk_isa_dma_hangs },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596, quirk_isa_dma_hangs },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0, quirk_isa_dma_hangs },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_868, quirk_s3_64M },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_968, quirk_s3_64M },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82437, quirk_triton },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82437VX, quirk_triton },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82439, quirk_triton },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82439TX, quirk_triton },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441, quirk_natoma },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443LX_0, quirk_natoma },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443LX_1, quirk_natoma },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_0, quirk_natoma },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_1, quirk_natoma },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_2, quirk_natoma },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, quirk_nopcipci },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_496, quirk_nopcipci },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, quirk_vialatency },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8371_1, quirk_vialatency },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, 0x3112 /* Not out yet ? */, quirk_vialatency },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C576, quirk_vsfx },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C597_0, quirk_viaetbf },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C597_0, quirk_vt82c598_id },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3, quirk_vt82c586_acpi },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4, quirk_vt82c686_acpi },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, quirk_piix4_acpi },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, quirk_ali7101_acpi },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_2, quirk_piix3_usb },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_2, quirk_piix3_usb },
- { PCI_FIXUP_FINAL, PCI_ANY_ID, PCI_ANY_ID, quirk_cardbus_legacy },
- #ifdef CONFIG_X86_IO_APIC
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, quirk_via_ioapic },
- #endif
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3, quirk_via_acpi },
- { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4, quirk_via_acpi },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_2, quirk_via_irqpic },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5, quirk_via_irqpic },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_6, quirk_via_irqpic },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7410, quirk_amd_ioapic },
- { PCI_FIXUP_FINAL, PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_FE_GATE_700C, quirk_amd_ordering },
- { 0 }
- };
- static void pci_do_fixups(struct pci_dev *dev, int pass, struct pci_fixup *f)
- {
- while (f->pass) {
- if (f->pass == pass &&
- (f->vendor == dev->vendor || f->vendor == (u16) PCI_ANY_ID) &&
- (f->device == dev->device || f->device == (u16) PCI_ANY_ID)) {
- #ifdef DEBUG
- printk(KERN_INFO "PCI: Calling quirk %p for %sn", f->hook, dev->slot_name);
- #endif
- f->hook(dev);
- }
- f++;
- }
- }
- void pci_fixup_device(int pass, struct pci_dev *dev)
- {
- pci_do_fixups(dev, pass, pcibios_fixups);
- pci_do_fixups(dev, pass, pci_fixups);
- }