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>
11 #ifdef CONFIG_ACPI_BOOT
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;
22 void __init check_acpi_pci(void)
26 /* Assume the machine supports type 1. If not it will
27 always read ffffffff and should not have any side effect. */
29 /* Poor man's PCI discovery */
30 for (num = 0; num < 32; num++) {
31 for (slot = 0; slot < 32; slot++) {
32 for (func = 0; func < 8; func++) {
35 class = read_pci_config(num,slot,func,
37 if (class == 0xffffffff)
40 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
43 vendor = read_pci_config(num, slot, func,
46 if (check_bridge(vendor&0xffff, vendor >> 16))
53 #endif /* CONFIG_ACPI */