arch/i386/kernel/acpi/earlyquirk.c

   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 <linux/acpi.h>
   9
  10 #include <asm/pci-direct.h>
  11 #include <asm/acpi.h>
  12 #include <asm/apic.h>
  13 #include <asm/irq.h>
  14
  15 #ifdef CONFIG_ACPI
  16
  17 static int __init nvidia_hpet_check(struct acpi_table_header *header)
  18 {
  19         return 0;
  20 }
  21 #endif
  22
  23 static int __init check_bridge(int vendor, int device)
  24 {
  25 #ifdef CONFIG_ACPI
  26         static int warned;
  27         /* According to Nvidia all timer overrides are bogus unless HPET
  28            is enabled. */
  29         if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) {
  30                 if (!warned && acpi_table_parse(ACPI_SIG_HPET,
  31                                                 nvidia_hpet_check)) {
  32                         warned = 1;
  33                         acpi_skip_timer_override = 1;
  34                           printk(KERN_INFO "Nvidia board "
  35                        "detected. Ignoring ACPI "
  36                        "timer override.\n");
  37                 printk(KERN_INFO "If you got timer trouble "
  38                                  "try acpi_use_timer_override\n");
  39
  40                 }
  41         }
  42 #endif
  43         if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
  44                 timer_over_8254 = 0;
  45                 printk(KERN_INFO "ATI board detected. Disabling timer routing "
  46                                 "over 8254.\n");
  47         }
  48         return 0;
  49 }
  50
  51 static void check_intel(void)
  52 {
  53         u16 vendor, device;
  54
  55         vendor = read_pci_config_16(0, 0, 0, PCI_VENDOR_ID);
  56
  57         if (vendor != PCI_VENDOR_ID_INTEL)
  58                 return;
  59
  60         device = read_pci_config_16(0, 0, 0, PCI_DEVICE_ID);
  61 #ifdef CONFIG_SMP
  62         if (device == PCI_DEVICE_ID_INTEL_E7320_MCH ||
  63             device == PCI_DEVICE_ID_INTEL_E7520_MCH ||
  64             device == PCI_DEVICE_ID_INTEL_E7525_MCH)
  65                 quirk_intel_irqbalance();
  66 #endif
  67 }
  68
  69 void __init check_acpi_pci(void)
  70 {
  71         int num, slot, func;
  72
  73         /* Assume the machine supports type 1. If not it will
  74            always read ffffffff and should not have any side effect.
  75            Actually a few buggy systems can machine check. Allow the user
  76            to disable it by command line option at least -AK */
  77         if (!early_pci_allowed())
  78                 return;
  79
  80         check_intel();
  81
  82         /* Poor man's PCI discovery */
  83         for (num = 0; num < 32; num++) {
  84                 for (slot = 0; slot < 32; slot++) {
  85                         for (func = 0; func < 8; func++) {
  86                                 u32 class;
  87                                 u32 vendor;
  88                                 class = read_pci_config(num, slot, func,
  89                                                         PCI_CLASS_REVISION);
  90                                 if (class == 0xffffffff)
  91                                         break;
  92
  93                                 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
  94                                         continue;
  95
  96                                 vendor = read_pci_config(num, slot, func,
  97                                                          PCI_VENDOR_ID);
  98
  99                                 if (check_bridge(vendor & 0xffff, vendor >> 16))
 100                                         return;
 101                         }
 102
 103                 }
 104         }
 105 }