diff --git a/arch/mips/pci/pci-vr41xx.c b/arch/mips/pci/pci-vr41xx.c
index 33c4f68..d1e049b 100644
--- a/arch/mips/pci/pci-vr41xx.c
+++ b/arch/mips/pci/pci-vr41xx.c
@@ -3,7 +3,7 @@
  *
  *  Copyright (C) 2001-2003 MontaVista Software Inc.
  *    Author: Yoichi Yuasa <yyuasa@mvista.com or source@mvista.com>
- *  Copyright (C) 2004-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
+ *  Copyright (C) 2004-2008  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
  *  Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -300,6 +300,18 @@
 		ioport_resource.end = IO_PORT_RESOURCE_END;
 	}
 
+	if (setup->master_io) {
+		void __iomem *io_map_base;
+		struct resource *res = vr41xx_pci_controller.io_resource;
+		master = setup->master_io;
+		io_map_base = ioremap(master->bus_base_address,
+				      res->end - res->start + 1);
+		if (!io_map_base)
+			return -EBUSY;
+
+		vr41xx_pci_controller.io_map_base = (unsigned long)io_map_base;
+	}
+
 	register_pci_controller(&vr41xx_pci_controller);
 
 	return 0;