i386: move pci

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
new file mode 100644
index 00000000000..5565d7016b7
--- /dev/null
+++ b/arch/x86/pci/legacy.c
@@ -0,0 +1,56 @@
+/*
+ * legacy.c - traditional, old school PCI bus probing
+ */
+#include <linux/init.h>
+#include <linux/pci.h>
+#include "pci.h"
+
+/*
+ * Discover remaining PCI buses in case there are peer host bridges.
+ * We use the number of last PCI bus provided by the PCI BIOS.
+ */
+static void __devinit pcibios_fixup_peer_bridges(void)
+{
+        int n, devfn;
+
+        if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
+                return;
+        DBG("PCI: Peer bridge fixup\n");
+
+        for (n=0; n <= pcibios_last_bus; n++) {
+                u32 l;
+                if (pci_find_bus(0, n))
+                        continue;
+                for (devfn = 0; devfn < 256; devfn += 8) {
+                        if (!raw_pci_ops->read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
+                            l != 0x0000 && l != 0xffff) {
+                                DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
+                                printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
+                                pci_scan_bus_with_sysdata(n);
+                                break;
+                        }
+                }
+        }
+}
+
+static int __init pci_legacy_init(void)
+{
+        if (!raw_pci_ops) {
+                printk("PCI: System does not support PCI\n");
+                return 0;
+        }
+
+        if (pcibios_scanned++)
+                return 0;
+
+        printk("PCI: Probing PCI hardware\n");
+        pci_root_bus = pcibios_scan_root(0);
+        if (pci_root_bus)
+                pci_bus_add_devices(pci_root_bus);
+
+        pcibios_fixup_peer_bridges();
+
+        return 0;
+}
+
+subsys_initcall(pci_legacy_init);