1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
|
|
* Do early PCI probing for bug detection when the main PCI subsystem is
|
|
* not up yet.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <asm/pci-direct.h>
|
|
#include <asm/acpi.h>
|
|
|
|
static int __init check_bridge(int vendor, int device)
|
|
{
|
|
/* According to Nvidia all timer overrides are bogus. Just ignore
|
|
them all. */
|
|
if (vendor == PCI_VENDOR_ID_NVIDIA) {
|
|
acpi_skip_timer_override = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void __init check_acpi_pci(void)
|
|
{
|
|
int num,slot,func;
|
|
|
|
/* Assume the machine supports type 1. If not it will
|
|
always read ffffffff and should not have any side effect. */
|
|
|
|
/* Poor man's PCI discovery */
|
|
for (num = 0; num < 32; num++) {
|
|
for (slot = 0; slot < 32; slot++) {
|
|
for (func = 0; func < 8; func++) {
|
|
u32 class;
|
|
u32 vendor;
|
|
class = read_pci_config(num,slot,func,
|
|
PCI_CLASS_REVISION);
|
|
if (class == 0xffffffff)
|
|
break;
|
|
|
|
if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
|
|
continue;
|
|
|
|
vendor = read_pci_config(num, slot, func,
|
|
PCI_VENDOR_ID);
|
|
|
|
if (check_bridge(vendor&0xffff, vendor >> 16))
|
|
return;
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|