projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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> | |
| d44647b0 AC |
8 | #include <linux/acpi.h> |
| 9 | ||
| 1da177e4 LT |
10 | #include <asm/pci-direct.h> |
| 11 | #include <asm/acpi.h> | |
| f9262c12 | 12 | #include <asm/apic.h> |
| b0d0a4ba | 13 | #include <asm/irq.h> |
| 1da177e4 | 14 | |
| d44647b0 AC |
15 | #ifdef CONFIG_ACPI |
| 16 | ||
| 17 | static int nvidia_hpet_detected __initdata; | |
| 18 | ||
| ceb6c468 | 19 | static int __init nvidia_hpet_check(struct acpi_table_header *header) |
| d44647b0 AC |
20 | { |
| 21 | nvidia_hpet_detected = 1; | |
| 22 | return 0; | |
| 23 | } | |
| 24 | #endif | |
| 25 | ||
| 4be44fcd | 26 | static int __init check_bridge(int vendor, int device) |
| 1da177e4 | 27 | { |
| f9262c12 | 28 | #ifdef CONFIG_ACPI |
| d44647b0 AC |
29 | /* According to Nvidia all timer overrides are bogus unless HPET |
| 30 | is enabled. */ | |
| fa18f477 | 31 | if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) { |
| d44647b0 | 32 | nvidia_hpet_detected = 0; |
| ceb6c468 | 33 | acpi_table_parse("HPET", nvidia_hpet_check); |
| d44647b0 AC |
34 | if (nvidia_hpet_detected == 0) { |
| 35 | acpi_skip_timer_override = 1; | |
| fa18f477 AK |
36 | printk(KERN_INFO "Nvidia board " |
| 37 | "detected. Ignoring ACPI " | |
| 38 | "timer override.\n"); | |
| 39 | printk(KERN_INFO "If you got timer trouble " | |
| 40 | "try acpi_use_timer_override\n"); | |
| 41 | ||
| d44647b0 | 42 | } |
| 1da177e4 | 43 | } |
| f9262c12 AK |
44 | #endif |
| 45 | if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) { | |
| 46 | timer_over_8254 = 0; | |
| 47 | printk(KERN_INFO "ATI board detected. Disabling timer routing " | |
| 48 | "over 8254.\n"); | |
| 49 | } | |
| 1da177e4 LT |
50 | return 0; |
| 51 | } | |
| 4be44fcd | 52 | |
| b0d0a4ba SS |
53 | static void check_intel(void) |
| 54 | { | |
| 55 | u16 vendor, device; | |
| 56 | ||
| 57 | vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID); | |
| 58 | ||
| 59 | if (vendor != PCI_VENDOR_ID_INTEL) | |
| 60 | return; | |
| 61 | ||
| 62 | device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID); | |
| 63 | #ifdef CONFIG_SMP | |
| 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(); | |
| 68 | #endif | |
| 69 | } | |
| 70 | ||
| 4be44fcd LB |
71 | void __init check_acpi_pci(void) |
| 72 | { | |
| 73 | int num, slot, func; | |
| 1da177e4 LT |
74 | |
| 75 | /* Assume the machine supports type 1. If not it will | |
| 0637a70a AK |
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()) | |
| 80 | return; | |
| 1da177e4 | 81 | |
| b0d0a4ba SS |
82 | check_intel(); |
| 83 | ||
| 1da177e4 | 84 | /* Poor man's PCI discovery */ |
| 4be44fcd LB |
85 | for (num = 0; num < 32; num++) { |
| 86 | for (slot = 0; slot < 32; slot++) { | |
| 87 | for (func = 0; func < 8; func++) { | |
| 1da177e4 LT |
88 | u32 class; |
| 89 | u32 vendor; | |
| 4be44fcd | 90 | class = read_pci_config(num, slot, func, |
| 1da177e4 LT |
91 | PCI_CLASS_REVISION); |
| 92 | if (class == 0xffffffff) | |
| 4be44fcd | 93 | break; |
| 1da177e4 LT |
94 | |
| 95 | if ((class >> 16) != PCI_CLASS_BRIDGE_PCI) | |
| 4be44fcd LB |
96 | continue; |
| 97 | ||
| 98 | vendor = read_pci_config(num, slot, func, | |
| 1da177e4 | 99 | PCI_VENDOR_ID); |
| 4be44fcd LB |
100 | |
| 101 | if (check_bridge(vendor & 0xffff, vendor >> 16)) | |
| 102 | return; | |
| 103 | } | |
| 104 | ||
| 1da177e4 LT |
105 | } |
| 106 | } | |
| 107 | } |