diff --git a/src/southbridge/amd/pi/avalon/usb.c b/src/southbridge/amd/pi/avalon/usb.c
new file mode 100644
index 0000000..36eff6e
--- /dev/null
+++ b/src/southbridge/amd/pi/avalon/usb.c
@@ -0,0 +1,100 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2010 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <device/pci_ehci.h>
+#include <arch/io.h>
+#include "hudson.h"
+
+static struct pci_operations lops_pci = {
+	.set_subsystem = pci_dev_set_subsystem,
+};
+
+static void usb_init(struct device *dev)
+{
+}
+
+static struct device_operations usb_ops = {
+	.read_resources = pci_ehci_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init = usb_init,
+	.scan_bus = 0,
+	.ops_pci = &lops_pci,
+};
+
+static const struct pci_driver usb_0_driver __pci_driver = {
+	.ops = &usb_ops,
+	.vendor = PCI_VENDOR_ID_AMD,
+	.device = PCI_DEVICE_ID_ATI_SB900_USB_18_0,
+};
+static const struct pci_driver usb_1_driver __pci_driver = {
+	.ops = &usb_ops,
+	.vendor = PCI_VENDOR_ID_AMD,
+	.device = PCI_DEVICE_ID_ATI_SB900_USB_18_2,
+};
+
+/* the pci id of usb ctrl 0 and 1 are the same. */
+/*
+ * static const struct pci_driver usb_3_driver __pci_driver = {
+ * 	.ops = &usb_ops,
+ * 	.vendor = PCI_VENDOR_ID_AMD,
+ * 	.device = PCI_DEVICE_ID_ATI_HUDSON_USB_19_0,
+ * };
+ * static const struct pci_driver usb_4_driver __pci_driver = {
+ * 	.ops = &usb_ops,
+ * 	.vendor = PCI_VENDOR_ID_AMD,
+ * 	.device = PCI_DEVICE_ID_ATI_HUDSON_USB_19_1,
+ * };
+ */
+
+static const struct pci_driver usb_4_driver __pci_driver = {
+	.ops = &usb_ops,
+	.vendor = PCI_VENDOR_ID_AMD,
+	.device = PCI_DEVICE_ID_ATI_SB900_USB_20_5,
+};
+
+/*
+static struct device_operations usb_ops2 = {
+	.read_resources = pci_ehci_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init = usb_init2,
+	.scan_bus = 0,
+	.ops_pci = &lops_pci,
+};
+*/
+/*
+static const struct pci_driver usb_5_driver __pci_driver = {
+	.ops = &usb_ops2,
+	.vendor = PCI_VENDOR_ID_AMD,
+	.device = PCI_DEVICE_ID_ATI_HUDSON_USB_18_2,
+};
+*/
+/*
+ * static const struct pci_driver usb_5_driver __pci_driver = {
+ * 	.ops = &usb_ops2,
+ * 	.vendor = PCI_VENDOR_ID_AMD,
+ * 	.device = PCI_DEVICE_ID_ATI_HUDSON_USB_19_2,
+ * };
+ */