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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Do early PCI probing for bug detection when the main PCI subsystem is | |
3 | * not up yet. | |
4 | */ | |
5 | #include <linux/init.h> | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/pci.h> | |
8 | #include <asm/pci-direct.h> | |
9 | #include <asm/acpi.h> | |
10 | ||
11 | static int __init check_bridge(int vendor, int device) | |
12 | { | |
13 | /* According to Nvidia all timer overrides are bogus. Just ignore | |
14 | them all. */ | |
15 | if (vendor == PCI_VENDOR_ID_NVIDIA) { | |
16 | acpi_skip_timer_override = 1; | |
17 | } | |
18 | return 0; | |
19 | } | |
20 | ||
21 | void __init check_acpi_pci(void) | |
22 | { | |
23 | int num,slot,func; | |
24 | ||
25 | /* Assume the machine supports type 1. If not it will | |
26 | always read ffffffff and should not have any side effect. */ | |
27 | ||
28 | /* Poor man's PCI discovery */ | |
29 | for (num = 0; num < 32; num++) { | |
30 | for (slot = 0; slot < 32; slot++) { | |
31 | for (func = 0; func < 8; func++) { | |
32 | u32 class; | |
33 | u32 vendor; | |
34 | class = read_pci_config(num,slot,func, | |
35 | PCI_CLASS_REVISION); | |
36 | if (class == 0xffffffff) | |
37 | break; | |
38 | ||
39 | if ((class >> 16) != PCI_CLASS_BRIDGE_PCI) | |
40 | continue; | |
41 | ||
42 | vendor = read_pci_config(num, slot, func, | |
43 | PCI_VENDOR_ID); | |
44 | ||
45 | if (check_bridge(vendor&0xffff, vendor >> 16)) | |
46 | return; | |
47 | } | |
48 | ||
49 | } | |
50 | } | |
51 | } |