/*
* Exceptions for specific devices. Usually work-arounds for fatal design flaws.
*/
#include <linux/pci.h>
#include <linux/init.h>
#include "pci.h"
static void __devinit pci_fixup_i450nx(struct pci_dev *d)
{
/*
* i450NX -- Find and scan all secondary buses on all PXB's.
*/
int pxb, reg;
u8 busno, suba, subb;
printk(KERN_WARNING "PCI: Searching for i450NX host bridges on %s\n", pci_name(d));
reg = 0xd0;
for(pxb=0; pxb<2; pxb++) {
pci_read_config_byte(d, reg++, &busno);
pci_read_config_byte(d, reg++, &suba);
pci_read_config_byte(d, reg++, &subb);
DBG("i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno, suba, subb);
if (busno)
pci_scan_bus(busno, &pci_root_ops, NULL); /* Bus A */
if (suba < subb)
pci_scan_bus(suba+1, &pci_root_ops, NULL); /* Bus B */
}
pcibios_last_bus = -1;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82451NX, pci_fixup_i450nx);
static void __devinit pci_fixup_i450gx(struct pci_dev *d)
{
/*
* i450GX and i450KX -- Find and scan all secondary buses.
* (called separately for each PCI bridge found)
*/
u8 busno;
pci_read_config_byte(d, 0x4a, &busno);
printk(KERN_INFO "PCI: i440KX/GX host bridge %s: secondary bus %02x\n", pci_name(d), busno);
pci_scan_bus(busno, &pci_root_ops, NULL);
pcibios_last_bus = -1;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);
static void __devinit pci_fixup_umc_ide(struct pci_dev *d)
{
/*
* UM8886BF IDE controller sets region type bits incorrectly,
* therefore they look like memory despite of them being I/O.
*/
int i;
printk(KERN_WARNING "PCI: Fixing base address flags for device %s\n", pci_name(d));
for(i=0; i<4; i++)
d->resource[i].flags |= PCI_BASE_ADDRESS_SPACE_IO;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_UMC, PCI_DEVICE_ID_UMC_UM8886BF, pci_fixup_umc_ide);
static void __devinit pci_fixup_ncr53c810(struct pci_dev *d)
{
/*
* NCR 53C810 returns class code 0 (at least on some systems).
* Fix class to be PCI_CLASS_STORAGE_SCSI
*/
if (!d->class) {
printk(KERN_WARNING "PCI: fixing NCR 53C810 class code for %s\n", pci_name(d));
d->class = PCI_CLASS_STORAGE_SCSI << 8;
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, pci_fixup_ncr53c810);
static void __devinit pci_fixup_ide_bases(struct pci_dev *d)
{
int i;
/*
* PCI IDE controllers use non-standard I/O port decoding, respect it.
*/
if ((d->class >> 8) != PCI_CLASS_STORAGE_IDE)
return;
DBG("PCI: IDE base address fixup for %s\n", pci_name(d));
for(i=0; i<4; i++) {
struct resource *r = &d->resource[i];
if ((r->start & ~0x80) == 0x374) {
r->start |= 2;
r->end = r->start;
}
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
static void __devinit pci_fixup_ide_trash(struct pci_dev *d)
{
int i;
/*
* Runs the fixup only for the first IDE controller
* (Shai Fultheim - shai@ftcon.com)
*/
static int called = 0;
if (called)
return;
called = 1;
/*
* There exist PCI IDE controllers which have utter garbage
* in first four base registers. Ignore that.
*/
DBG("PCI: IDE base address trash cleared for %s\n", pci_name(d));
for(i=0; i<4; i++)
d->resource[i].start = d->resource[i].end = d->resource[i].flags = 0;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5513, pci_fixup_ide_trash);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_10, pci_fixup_ide_trash);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_11, pci_fixup_ide_trash);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_9, pci_fixup_ide_trash);
static void __devinit pci_fixup_latency(struct pci_dev *d)
{
/*
* SiS 5597 and 5598 chipsets require latency timer set to
* at most 32 to avoid lockups.
*/
DBG("PCI: Setting max latency to 32\n");
pcibios_max_latency = 32;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency);
static void __devinit pci_fixup_piix4_acpi(struct pci_dev *d)
{
/*
* PIIX4 ACPI device: hardwired IRQ9
*/
d->irq = 9;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi);
/*
* Addresses issues with problems in the memory write queue timer in
* certain VIA Northbridges. This bugfix is per VIA's specifications,
* except for the KL133/KM133: clearing bit 5 on those Northbridges seems
* to trigger a bug in its integrated ProSavage video card, which
* causes screen corruption. We only clear bits 6 and 7 for that chipset,
* until VIA can provide us with definitive information on why screen
* corruption occurs, and what exactly those bits do.
*
* VIA 8363,8622,8361 Northbridges:
* - bits 5, 6, 7 at offset 0x55 need to be turned off
* VIA 8367 (KT266x) Northbridges:
* - bits 5, 6, 7 at offset 0x95 need to be turned off
* VIA 8363 rev 0x81/0x84 (KL133/KM133) Northbridges:
* - bits 6, 7 at offset 0x55 need to be turned off
*/
#define VIA_8363_KL133_REVISION_ID 0x81
#define VIA_8363_KM133_REVISION_ID 0x84
static void __devinit pci_fixup_via_northbridge_bug(struct pci_dev *d)
{
u8 v;
u8 revision;
int where = 0x55;
int mask = 0x1f; /* clear bits 5, 6, 7 by default */
pci_read_config_byte(d, PCI_REVISION_ID, &revision);
if (d->device == PCI_DEVICE_ID_VIA_8367_0) {
/* fix pci bus latency issues resulted by NB bios error
it appears on bug free^Wreduced kt266x's bios forces
NB latency to zero */
pci_write_config_byte(d, PCI_LATENCY_TIMER, 0);
where = 0x95; /* the memory write queue timer register is
different for the KT266x's: 0x95 not 0x55 */
} else if (d->device == PCI_DEVICE_ID_VIA_8363_0 &&
(revision == VIA_8363_KL133_REVISION_ID ||
revision == VIA_8363_KM133_REVISION_ID)) {
mask = 0x3f; /* clear only bits 6 and 7; clearing bit 5
causes screen corruption on the KL133/KM133 */
}
pci_read_config_byte(d, where, &v);
if (v & ~mask) {
printk(KERN_WARNING "Disabling VIA memory write queue (PCI ID %04x, rev %02x): [%02x] %02x & %02x -> %02x\n", \
d->device, revision, where, v, mask, v & mask);
v &= mask;
pci_write_config_byte(d, where, v);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug);
/*
* For some reasons Intel decided that certain parts of their
* 815, 845 and some other chipsets must look like PCI-to-PCI bridges
* while they are obviously not. The 82801 family (AA, AB, BAM/CAM,
* BA/CA/DB and E) PCI bridges are actually HUB-to-PCI ones, according
* to Intel terminology. These devices do forward all addresses from
* system to PCI bus no matter what are their window settings, so they are
* "transparent" (or subtractive decoding) from programmers point of view.
*/
static void __devinit pci_fixup_transparent_bridge(struct pci_dev *dev)
{
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI &&
(dev->device & 0xff00) == 0x2400)
dev->transparent = 1;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_fixup_transparent_bridge);
/*
* Fixup for C1 Halt Disconnect problem on nForce2 systems.
*
* From information provided by "Allen Martin" <AMartin@nvidia.com>:
*
* A hang is caused when the CPU generates a very fast CONNECT/HALT cycle
* sequence. Workaround is to set the SYSTEM_IDLE_TIMEOUT to 80 ns.
* This allows the state-machine and timer to return to a proper state within
* 80 ns of the CONNECT and probe appearing together. Since the CPU will not
* issue another HALT within 80 ns of the initial HALT, the failure condition
* is avoided.
*/
static void __init pci_fixup_nforce2(struct pci_dev *dev)
{
u32 val;
/*
* Chip Old value New value
* C17 0x1F0FFF01 0x1F01FF01
* C18D 0x9F0FFF01 0x9F01FF01
*
* Northbridge chip version may be determined by
* reading the PCI revision ID (0xC1 or greater is C18D).
*/
pci_read_config_dword(dev, 0x6c, &val);
/*
* Apply fixup if needed, but don't touch disconnect state
*/
if ((val & 0x00FF0000) != 0x00010000) {
printk(KERN_WARNING "PCI: nForce2 C1 Halt Disconnect fixup\n");
pci_write_config_dword(dev, 0x6c, (val & 0xFF00FFFF) | 0x00010000);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2, pci_fixup_nforce2);
/* Max PCI Express root ports */
#define MAX_PCIEROOT 6
static int quirk_aspm_offset[MAX_PCIEROOT << 3];
#define GET_INDEX(a, b) ((((a) - PCI_DEVICE_ID_INTEL_MCH_PA) << 3) + ((b) & 7))
static int quirk_pcie_aspm_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
{
return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
}
/*
* Replace the original pci bus ops for write with a new one that will filter
* the request to insure ASPM cannot be enabled.
*/
static int quirk_pcie_aspm_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
{
u8 offset;
offset = quirk_aspm_offset[GET_INDEX(bus->self->device, devfn)];
if ((offset) && (where == offset))
value = value & 0xfffffffc;
return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
}
static struct pci_ops quirk_pcie_aspm_ops = {
.read = quirk_pcie_aspm_read,
.write = quirk_pcie_aspm_write,
};
/*
* Prevents PCI Express ASPM (Active State Power Management) being enabled.
*
* Save the register offset, where the ASPM control bits are located,
* for each PCI Express device that is in the device list of
* the root port in an array for fast indexing. Replace the bus ops
* with the modified one.
*/
static void pcie_rootport_aspm_quirk(struct pci_dev *pdev)
{
int cap_base, i;
struct pci_bus *pbus;
struct pci_dev *dev;
if ((pbus = pdev->subordinate) == NULL)
return;
/*
* Check if the DID of pdev matches one of the six root ports. This
* check is needed in the case this function is called directly by the
* hot-plug driver.
*/
if ((pdev->device < PCI_DEVICE_ID_INTEL_MCH_PA) ||
(pdev->device > PCI_DEVICE_ID_INTEL_MCH_PC1))
return;
if (list_empty(&pbus->devices)) {
/*
* If no device is attached to the root port at power-up or
* after hot-remove, the pbus->devices is empty and this code
* will set the offsets to zero and the bus ops to parent's bus
* ops, which is unmodified.
*/
for (i= GET_INDEX(pdev->device, 0); i <= GET_INDEX(pdev->device, 7); ++i)
quirk_aspm_offset[i] = 0;
pbus->ops = pbus->parent->ops;
} else {
/*
* If devices are attached to the root port at power-up or
* after hot-add, the code loops through the device list of
* each root port to save the register offsets and replace the
* bus ops.
*/
list_for_each_entry(dev, &pbus->devices, bus_list) {
/* There are 0 to 8 devices attached to this bus */
cap_base = pci_find_capability(dev, PCI_CAP_ID_EXP);
quirk_aspm_offset[GET_INDEX(pdev->device, dev->devfn)]= cap_base + 0x10;
}
pbus->ops = &quirk_pcie_aspm_ops;
}
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PA, pcie_rootport_aspm_quirk );
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PA1, pcie_rootport_aspm_quirk );
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PB, pcie_rootport_aspm_quirk );
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PB1, pcie_rootport_aspm_quirk );
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PC, pcie_rootport_aspm_quirk );
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PC1, pcie_rootport_aspm_quirk );
/*
* Fixup to mark boot BIOS video selected by BIOS before it changes
*
* From information provided by "Jon Smirl" <jonsmirl@gmail.com>
*
* The standard boot ROM sequence for an x86 machine uses the BIOS
* to select an initial video card for boot display. This boot video
* card will have it's BIOS copied to C0000 in system RAM.
* IORESOURCE_ROM_SHADOW is used to associate the boot video
* card with this copy. On laptops this copy has to be used since
* the main ROM may be compressed or combined with another image.
* See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW
* is marked here since the boot video device will be the only enabled
* video device at this point.
*/
static void __devinit pci_fixup_video(struct pci_dev *pdev)
{
struct pci_dev *bridge;
struct pci_bus *bus;
u16 config;
if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
return;
/* Is VGA routed to us? */
bus = pdev->bus;
while (bus) {
bridge = bus->self;
if (bridge) {
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
&config);
if (!(config & PCI_BRIDGE_CTL_VGA))
return;
}
bus = bus->parent;
}
pci_read_config_word(pdev, PCI_COMMAND, &config);
if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
printk(KERN_DEBUG "Boot video device is %s\n", pci_name(pdev));
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);
