This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / i386 / kernel / acpi / earlyquirk.c

diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
new file mode 100644 (file)
index 0000000..726a5ca
--- /dev/null
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -0,0 +1,51 @@
+/* 
+ * 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 <asm/pci-direct.h>
+#include <asm/acpi.h>
+
+static int __init check_bridge(int vendor, int device) 
+{
+       /* According to Nvidia all timer overrides are bogus. Just ignore
+          them all. */
+       if (vendor == PCI_VENDOR_ID_NVIDIA) { 
+               acpi_skip_timer_override = 1;           
+       }
+       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. */
+
+       /* 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; 
+                       } 
+                       
+               }
+       }
+}