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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@suse.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://linux.powertweak.com/).
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.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("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 = 0; /* 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 = 0;
/*
* 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;
}
}
/*
* 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;
}
}
/*
* 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 },
{ 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("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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