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 nvidia_hpet_detected __initdata;
  18
  19 static int __init nvidia_hpet_check(struct acpi_table_header *header)
  20 {
  21         nvidia_hpet_detected = 1;
  22         return 0;
  23 }
  24 #endif
  25
  26 static int __init check_bridge(int vendor, int device)
  27 {
  28 #ifdef CONFIG_ACPI
  29         /* According to Nvidia all timer overrides are bogus unless HPET
  30            is enabled. */
  31         if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) {
  32                 nvidia_hpet_detected = 0;
  33                 acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check);
  34                 if (nvidia_hpet_detected == 0) {
  35                         acpi_skip_timer_override = 1;
  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
  42                 }
  43         }
  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         }
  50         return 0;
  51 }
  52
  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
  71 void __init check_acpi_pci(void)
  72 {
  73         int num, slot, func;
  74
  75         /* Assume the machine supports type 1. If not it will
  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;
  81
  82         check_intel();
  83
  84         /* Poor man's PCI discovery */
  85         for (num = 0; num < 32; num++) {
  86                 for (slot = 0; slot < 32; slot++) {
  87                         for (func = 0; func < 8; func++) {
  88                                 u32 class;
  89                                 u32 vendor;
  90                                 class = read_pci_config(num, slot, func,
  91                                                         PCI_CLASS_REVISION);
  92                                 if (class == 0xffffffff)
  93                                         break;
  94
  95                                 if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
  96                                         continue;
  97
  98                                 vendor = read_pci_config(num, slot, func,
  99                                                          PCI_VENDOR_ID);
 100
 101                                 if (check_bridge(vendor & 0xffff, vendor >> 16))
 102                                         return;
 103                         }
 104
 105                 }
 106         }
 107 }