1 files changed, 84 insertions, 0 deletions
diff --git a/arch/x86/kernel/acpi/earlyquirk_32.c b/arch/x86/kernel/acpi/earlyquirk_32.c
new file mode 100644
index 00000000000..23f78efc577
--- /dev/null
+++ b/arch/x86/kernel/acpi/earlyquirk_32.c
@@ -0,0 +1,84 @@
+/* 
+ * Do early PCI probing for bug detection when the main PCI subsystem is 
+ * not up yet.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+
+#include <asm/pci-direct.h>
+#include <asm/acpi.h>
+#include <asm/apic.h>
+
+#ifdef CONFIG_ACPI
+
+static int __init nvidia_hpet_check(struct acpi_table_header *header)
+{
+	return 0;
+}
+#endif
+
+static int __init check_bridge(int vendor, int device)
+{
+#ifdef CONFIG_ACPI
+	static int warned;
+	/* According to Nvidia all timer overrides are bogus unless HPET
+	   is enabled. */
+	if (!acpi_use_timer_override && vendor == PCI_VENDOR_ID_NVIDIA) {
+		if (!warned && acpi_table_parse(ACPI_SIG_HPET,
+						nvidia_hpet_check)) {
+			warned = 1;
+			acpi_skip_timer_override = 1;
+			  printk(KERN_INFO "Nvidia board "
+                       "detected. Ignoring ACPI "
+                       "timer override.\n");
+                printk(KERN_INFO "If you got timer trouble "
+			 	 "try acpi_use_timer_override\n");
+
+		}
+	}
+#endif
+	if (vendor == PCI_VENDOR_ID_ATI && timer_over_8254 == 1) {
+		timer_over_8254 = 0;
+		printk(KERN_INFO "ATI board detected. Disabling timer routing "
+				"over 8254.\n");
+	}
+	return 0;
+}
+
+void __init check_acpi_pci(void)
+{
+	int num, slot, func;
+
+	/* Assume the machine supports type 1. If not it will 
+	   always read ffffffff and should not have any side effect.
+	   Actually a few buggy systems can machine check. Allow the user
+	   to disable it by command line option at least -AK */
+	if (!early_pci_allowed())
+		return;
+
+	/* Poor man's PCI discovery */
+	for (num = 0; num < 32; num++) {
+		for (slot = 0; slot < 32; slot++) {
+			for (func = 0; func < 8; func++) {
+				u32 class;
+				u32 vendor;
+				class = read_pci_config(num, slot, func,
+							PCI_CLASS_REVISION);
+				if (class == 0xffffffff)
+					break;
+
+				if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
+					continue;
+
+				vendor = read_pci_config(num, slot, func,
+							 PCI_VENDOR_ID);
+
+				if (check_bridge(vendor & 0xffff, vendor >> 16))
+					return;
+			}
+
+		}
+	}
+}