2 * Do early PCI probing for bug detection when the main PCI subsystem is
5 #include <linux/init.h>
6 #include <linux/kernel.h>
8 #include <asm/pci-direct.h>
12 static int __init check_bridge(int vendor, int device)
14 /* According to Nvidia all timer overrides are bogus. Just ignore
16 if (vendor == PCI_VENDOR_ID_NVIDIA) {
17 acpi_skip_timer_override = 1;
19 #ifdef CONFIG_X86_LOCAL_APIC
21 * ATI IXP chipsets get double timer interrupts.
22 * For now just do this for all ATI chipsets.
23 * FIXME: this needs to be checked for the non ACPI case too.
25 if (vendor == PCI_VENDOR_ID_ATI)
26 disable_timer_pin_1 = 1;
31 void __init check_acpi_pci(void)
35 /* Assume the machine supports type 1. If not it will
36 always read ffffffff and should not have any side effect. */
38 /* Poor man's PCI discovery */
39 for (num = 0; num < 32; num++) {
40 for (slot = 0; slot < 32; slot++) {
41 for (func = 0; func < 8; func++) {
44 class = read_pci_config(num, slot, func,
46 if (class == 0xffffffff)
49 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
52 vendor = read_pci_config(num, slot, func,
55 if (check_bridge(vendor & 0xffff, vendor >> 16))