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 __init nvidia_hpet_check(struct acpi_table_header *header)
23 static int __init check_bridge(int vendor, int device)
26 /* According to Nvidia all timer overrides are bogus unless HPET
28 if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) {
29 if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) {
30 acpi_skip_timer_override = 1;
31 printk(KERN_INFO "Nvidia board "
32 "detected. Ignoring ACPI "
34 printk(KERN_INFO "If you got timer trouble "
35 "try acpi_use_timer_override\n");
40 if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
42 printk(KERN_INFO "ATI board detected. Disabling timer routing "
48 static void check_intel(void)
52 vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
54 if (vendor != PCI_VENDOR_ID_INTEL)
57 device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
59 if (device == PCI_DEVICE_ID_INTEL_E7320_MCH ||
60 device == PCI_DEVICE_ID_INTEL_E7520_MCH ||
61 device == PCI_DEVICE_ID_INTEL_E7525_MCH)
62 quirk_intel_irqbalance();
66 void __init check_acpi_pci(void)
70 /* Assume the machine supports type 1. If not it will
71 always read ffffffff and should not have any side effect.
72 Actually a few buggy systems can machine check. Allow the user
73 to disable it by command line option at least -AK */
74 if (!early_pci_allowed())
79 /* Poor man's PCI discovery */
80 for (num = 0; num < 32; num++) {
81 for (slot = 0; slot < 32; slot++) {
82 for (func = 0; func < 8; func++) {
85 class = read_pci_config(num, slot, func,
87 if (class == 0xffffffff)
90 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
93 vendor = read_pci_config(num, slot, func,
96 if (check_bridge(vendor & 0xffff, vendor >> 16))