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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 13:16:36 +0400
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 13:16:36 +0400
commitfb9aa6f1d4a1e11e66a680460b2c2b2b10b62f79 (patch)
treee0ad51f39b48a342244cef62099bd1a8a93927db /arch/x86/pci/legacy.c
parent4b60eb8380a0b588a03b6052d7ac93e1964c75b8 (diff)
downloadlinux-fb9aa6f1d4a1e11e66a680460b2c2b2b10b62f79.tar.xz
i386: move pci
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/pci/legacy.c')
-rw-r--r--arch/x86/pci/legacy.c56
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 000000000000..5565d7016b75
--- /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);