Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 8 | #include <linux/acpi.h> |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <asm/pci-direct.h> |
| 11 | #include <asm/acpi.h> |
Andi Kleen | f9262c1 | 2006-03-08 17:57:25 -0800 | [diff] [blame] | 12 | #include <asm/apic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 14 | #ifdef CONFIG_ACPI |
| 15 | |
Alexey Starikovskiy | ceb6c46 | 2007-02-02 19:48:22 +0300 | [diff] [blame] | 16 | static int __init nvidia_hpet_check(struct acpi_table_header *header) |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 17 | { |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 18 | return 0; |
| 19 | } |
| 20 | #endif |
| 21 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 22 | static int __init check_bridge(int vendor, int device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | { |
Andi Kleen | f9262c1 | 2006-03-08 17:57:25 -0800 | [diff] [blame] | 24 | #ifdef CONFIG_ACPI |
Zachary Amsden | afd3810 | 2007-04-25 15:32:23 -0400 | [diff] [blame] | 25 | static int warned; |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 26 | /* According to Nvidia all timer overrides are bogus unless HPET |
| 27 | is enabled. */ |
Andi Kleen | fa18f47 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 28 | if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) { |
Thierry Vignaud | b2983f1 | 2007-04-25 15:31:30 -0400 | [diff] [blame] | 29 | if (!warned && acpi_table_parse(ACPI_SIG_HPET, |
| 30 | nvidia_hpet_check)) { |
| 31 | warned = 1; |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 32 | acpi_skip_timer_override = 1; |
Andi Kleen | fa18f47 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 33 | printk(KERN_INFO "Nvidia board " |
| 34 | "detected. Ignoring ACPI " |
| 35 | "timer override.\n"); |
| 36 | printk(KERN_INFO "If you got timer trouble " |
| 37 | "try acpi_use_timer_override\n"); |
| 38 | |
Andy Currid | d44647b | 2006-06-08 00:43:38 -0700 | [diff] [blame] | 39 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | } |
Andi Kleen | f9262c1 | 2006-03-08 17:57:25 -0800 | [diff] [blame] | 41 | #endif |
| 42 | if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) { |
| 43 | timer_over_8254 = 0; |
| 44 | printk(KERN_INFO "ATI board detected. Disabling timer routing " |
| 45 | "over 8254.\n"); |
| 46 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | return 0; |
| 48 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 49 | |
| 50 | void __init check_acpi_pci(void) |
| 51 | { |
| 52 | int num, slot, func; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* Assume the machine supports type 1. If not it will |
Andi Kleen | 0637a70 | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 55 | always read ffffffff and should not have any side effect. |
| 56 | Actually a few buggy systems can machine check. Allow the user |
| 57 | to disable it by command line option at least -AK */ |
| 58 | if (!early_pci_allowed()) |
| 59 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | /* Poor man's PCI discovery */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 62 | for (num = 0; num < 32; num++) { |
| 63 | for (slot = 0; slot < 32; slot++) { |
| 64 | for (func = 0; func < 8; func++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | u32 class; |
| 66 | u32 vendor; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 67 | class = read_pci_config(num, slot, func, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | PCI_CLASS_REVISION); |
| 69 | if (class == 0xffffffff) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 70 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | if ((class >> 16) != PCI_CLASS_BRIDGE_PCI) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 73 | continue; |
| 74 | |
| 75 | vendor = read_pci_config(num, slot, func, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | PCI_VENDOR_ID); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 77 | |
| 78 | if (check_bridge(vendor & 0xffff, vendor >> 16)) |
| 79 | return; |
| 80 | } |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
| 83 | } |
| 84 | } |