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