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>
17 static int nvidia_hpet_detected __initdata;
19 static int __init nvidia_hpet_check(struct acpi_table_header *header)
21 nvidia_hpet_detected = 1;
26 static int __init check_bridge(int vendor, int device)
29 /* According to Nvidia all timer overrides are bogus unless HPET
31 if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) {
32 nvidia_hpet_detected = 0;
33 acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check);
34 if (nvidia_hpet_detected == 0) {
35 acpi_skip_timer_override = 1;
36 printk(KERN_INFO "Nvidia board "
37 "detected. Ignoring ACPI "
39 printk(KERN_INFO "If you got timer trouble "
40 "try acpi_use_timer_override\n");
45 if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
47 printk(KERN_INFO "ATI board detected. Disabling timer routing "
53 static void check_intel(void)
57 vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
59 if (vendor != PCI_VENDOR_ID_INTEL)
62 device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
64 if (device == PCI_DEVICE_ID_INTEL_E7320_MCH ||
65 device == PCI_DEVICE_ID_INTEL_E7520_MCH ||
66 device == PCI_DEVICE_ID_INTEL_E7525_MCH)
67 quirk_intel_irqbalance();
71 void __init check_acpi_pci(void)
75 /* Assume the machine supports type 1. If not it will
76 always read ffffffff and should not have any side effect.
77 Actually a few buggy systems can machine check. Allow the user
78 to disable it by command line option at least -AK */
79 if (!early_pci_allowed())
84 /* Poor man's PCI discovery */
85 for (num = 0; num < 32; num++) {
86 for (slot = 0; slot < 32; slot++) {
87 for (func = 0; func < 8; func++) {
90 class = read_pci_config(num, slot, func,
92 if (class == 0xffffffff)
95 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
98 vendor = read_pci_config(num, slot, func,
101 if (check_bridge(vendor & 0xffff, vendor >> 16))