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 <linux/acpi.h>
10 #include <asm/pci-direct.h>
16 static int nvidia_hpet_detected __initdata;
18 static int __init nvidia_hpet_check(unsigned long phys, unsigned long size)
20 nvidia_hpet_detected = 1;
25 static int __init check_bridge(int vendor, int device)
28 /* According to Nvidia all timer overrides are bogus unless HPET
30 if (vendor == PCI_VENDOR_ID_NVIDIA) {
31 nvidia_hpet_detected = 0;
32 acpi_table_parse(ACPI_HPET, nvidia_hpet_check);
33 if (nvidia_hpet_detected == 0) {
34 acpi_skip_timer_override = 1;
38 if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
40 printk(KERN_INFO "ATI board detected. Disabling timer routing "
46 void __init check_acpi_pci(void)
50 /* Assume the machine supports type 1. If not it will
51 always read ffffffff and should not have any side effect. */
53 /* Poor man's PCI discovery */
54 for (num = 0; num < 32; num++) {
55 for (slot = 0; slot < 32; slot++) {
56 for (func = 0; func < 8; func++) {
59 class = read_pci_config(num, slot, func,
61 if (class == 0xffffffff)
64 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
67 vendor = read_pci_config(num, slot, func,
70 if (check_bridge(vendor & 0xffff, vendor >> 16))