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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 %s\n", 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 routing\n",
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 %d\n",
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 try\n");
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 %s\n", 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);
}
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