| /* |
| * Do early PCI probing for bug detection when the main PCI subsystem is |
| * not up yet. |
| */ |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/acpi.h> |
| |
| #include <asm/pci-direct.h> |
| #include <asm/acpi.h> |
| #include <asm/apic.h> |
| |
| #ifdef CONFIG_ACPI |
| |
| static int __init nvidia_hpet_check(struct acpi_table_header *header) |
| { |
| return 0; |
| } |
| #endif |
| |
| static int __init check_bridge(int vendor, int device) |
| { |
| #ifdef CONFIG_ACPI |
| static int warned; |
| /* According to Nvidia all timer overrides are bogus unless HPET |
| is enabled. */ |
| if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) { |
| if (!warned && acpi_table_parse(ACPI_SIG_HPET, |
| nvidia_hpet_check)) { |
| warned = 1; |
| acpi_skip_timer_override = 1; |
| printk(KERN_INFO "Nvidia board " |
| "detected. Ignoring ACPI " |
| "timer override.\n"); |
| printk(KERN_INFO "If you got timer trouble " |
| "try acpi_use_timer_override\n"); |
| |
| } |
| } |
| #endif |
| if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) { |
| timer_over_8254 = 0; |
| printk(KERN_INFO "ATI board detected. Disabling timer routing " |
| "over 8254.\n"); |
| } |
| return 0; |
| } |
| |
| void __init check_acpi_pci(void) |
| { |
| int num, slot, func; |
| |
| /* Assume the machine supports type 1. If not it will |
| always read ffffffff and should not have any side effect. |
| Actually a few buggy systems can machine check. Allow the user |
| to disable it by command line option at least -AK */ |
| if (!early_pci_allowed()) |
| return; |
| |
| /* Poor man's PCI discovery */ |
| for (num = 0; num < 32; num++) { |
| for (slot = 0; slot < 32; slot++) { |
| for (func = 0; func < 8; func++) { |
| u32 class; |
| u32 vendor; |
| class = read_pci_config(num, slot, func, |
| PCI_CLASS_REVISION); |
| if (class == 0xffffffff) |
| break; |
| |
| if ((class >> 16) != PCI_CLASS_BRIDGE_PCI) |
| continue; |
| |
| vendor = read_pci_config(num, slot, func, |
| PCI_VENDOR_ID); |
| |
| if (check_bridge(vendor & 0xffff, vendor >> 16)) |
| return; |
| } |
| |
| } |
| } |
| } |
