edac: AMD8111 driver source file

Introduce AMD8111 EDAC driver source file, which makes use of error
detections on the LPC Bridge Controller and PCI Bridge Controller on the
AMD8111 HyperTransport I/O Hub.

Signed-off-by: Harry Ciao <qingtao.cao@windriver.com>
Cc: Doug Thompson <norsk5@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/edac/amd8111_edac.c

@@ -0,0 +1,595 @@
+/*
+ * amd8111_edac.c, AMD8111 Hyper Transport chip EDAC kernel module
+ *
+ * Copyright (c) 2008 Wind River Systems, Inc.
+ *
+ * Authors:	Cao Qingtao <qingtao.cao@windriver.com>
+ * 		Benjamin Walsh <benjamin.walsh@windriver.com>
+ * 		Hu Yongqi <yongqi.hu@windriver.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/bitops.h>
+#include <linux/edac.h>
+#include <linux/pci_ids.h>
+#include <asm/io.h>
+
+#include "edac_core.h"
+#include "edac_module.h"
+#include "amd8111_edac.h"
+
+#define AMD8111_EDAC_REVISION	" Ver: 1.0.0 " __DATE__
+#define AMD8111_EDAC_MOD_STR	"amd8111_edac"
+
+#define PCI_DEVICE_ID_AMD_8111_PCI	0x7460
+static int edac_dev_idx;
+
+enum amd8111_edac_devs {
+	LPC_BRIDGE = 0,
+};
+
+enum amd8111_edac_pcis {
+	PCI_BRIDGE = 0,
+};
+
+/* Wrapper functions for accessing PCI configuration space */
+static int edac_pci_read_dword(struct pci_dev *dev, int reg, u32 *val32)
+{
+	int ret;
+
+	ret = pci_read_config_dword(dev, reg, val32);
+	if (ret != 0)
+		printk(KERN_ERR AMD8111_EDAC_MOD_STR
+			" PCI Access Read Error at 0x%x\n", reg);
+
+	return ret;
+}
+
+static void edac_pci_read_byte(struct pci_dev *dev, int reg, u8 *val8)
+{
+	int ret;
+
+	ret = pci_read_config_byte(dev, reg, val8);
+	if (ret != 0)
+		printk(KERN_ERR AMD8111_EDAC_MOD_STR
+			" PCI Access Read Error at 0x%x\n", reg);
+}
+
+static void edac_pci_write_dword(struct pci_dev *dev, int reg, u32 val32)
+{
+	int ret;
+
+	ret = pci_write_config_dword(dev, reg, val32);
+	if (ret != 0)
+		printk(KERN_ERR AMD8111_EDAC_MOD_STR
+			" PCI Access Write Error at 0x%x\n", reg);
+}
+
+static void edac_pci_write_byte(struct pci_dev *dev, int reg, u8 val8)
+{
+	int ret;
+
+	ret = pci_write_config_byte(dev, reg, val8);
+	if (ret != 0)
+		printk(KERN_ERR AMD8111_EDAC_MOD_STR
+			" PCI Access Write Error at 0x%x\n", reg);
+}
+
+/*
+ * device-specific methods for amd8111 PCI Bridge Controller
+ *
+ * Error Reporting and Handling for amd8111 chipset could be found
+ * in its datasheet 3.1.2 section, P37
+ */
+static void amd8111_pci_bridge_init(struct amd8111_pci_info *pci_info)
+{
+	u32 val32;
+	struct pci_dev *dev = pci_info->dev;
+
+	/* First clear error detection flags on the host interface */
+
+	/* Clear SSE/SMA/STA flags in the global status register*/
+	edac_pci_read_dword(dev, REG_PCI_STSCMD, &val32);
+	if (val32 & PCI_STSCMD_CLEAR_MASK)
+		edac_pci_write_dword(dev, REG_PCI_STSCMD, val32);
+
+	/* Clear CRC and Link Fail flags in HT Link Control reg */
+	edac_pci_read_dword(dev, REG_HT_LINK, &val32);
+	if (val32 & HT_LINK_CLEAR_MASK)
+		edac_pci_write_dword(dev, REG_HT_LINK, val32);
+
+	/* Second clear all fault on the secondary interface */
+
+	/* Clear error flags in the memory-base limit reg. */
+	edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
+	if (val32 & MEM_LIMIT_CLEAR_MASK)
+		edac_pci_write_dword(dev, REG_MEM_LIM, val32);
+
+	/* Clear Discard Timer Expired flag in Interrupt/Bridge Control reg */
+	edac_pci_read_dword(dev, REG_PCI_INTBRG_CTRL, &val32);
+	if (val32 & PCI_INTBRG_CTRL_CLEAR_MASK)
+		edac_pci_write_dword(dev, REG_PCI_INTBRG_CTRL, val32);
+
+	/* Last enable error detections */
+	if (edac_op_state == EDAC_OPSTATE_POLL) {
+		/* Enable System Error reporting in global status register */
+		edac_pci_read_dword(dev, REG_PCI_STSCMD, &val32);
+		val32 |= PCI_STSCMD_SERREN;
+		edac_pci_write_dword(dev, REG_PCI_STSCMD, val32);
+
+		/* Enable CRC Sync flood packets to HyperTransport Link */
+		edac_pci_read_dword(dev, REG_HT_LINK, &val32);
+		val32 |= HT_LINK_CRCFEN;
+		edac_pci_write_dword(dev, REG_HT_LINK, val32);
+
+		/* Enable SSE reporting etc in Interrupt control reg */
+		edac_pci_read_dword(dev, REG_PCI_INTBRG_CTRL, &val32);
+		val32 |= PCI_INTBRG_CTRL_POLL_MASK;
+		edac_pci_write_dword(dev, REG_PCI_INTBRG_CTRL, val32);
+	}
+}
+
+static void amd8111_pci_bridge_exit(struct amd8111_pci_info *pci_info)
+{
+	u32 val32;
+	struct pci_dev *dev = pci_info->dev;
+
+	if (edac_op_state == EDAC_OPSTATE_POLL) {
+		/* Disable System Error reporting */
+		edac_pci_read_dword(dev, REG_PCI_STSCMD, &val32);
+		val32 &= ~PCI_STSCMD_SERREN;
+		edac_pci_write_dword(dev, REG_PCI_STSCMD, val32);
+
+		/* Disable CRC flood packets */
+		edac_pci_read_dword(dev, REG_HT_LINK, &val32);
+		val32 &= ~HT_LINK_CRCFEN;
+		edac_pci_write_dword(dev, REG_HT_LINK, val32);
+
+		/* Disable DTSERREN/MARSP/SERREN in Interrupt Control reg */
+		edac_pci_read_dword(dev, REG_PCI_INTBRG_CTRL, &val32);
+		val32 &= ~PCI_INTBRG_CTRL_POLL_MASK;
+		edac_pci_write_dword(dev, REG_PCI_INTBRG_CTRL, val32);
+	}
+}
+
+static void amd8111_pci_bridge_check(struct edac_pci_ctl_info *edac_dev)
+{
+	struct amd8111_pci_info *pci_info = edac_dev->pvt_info;
+	struct pci_dev *dev = pci_info->dev;
+	u32 val32;
+
+	/* Check out PCI Bridge Status and Command Register */
+	edac_pci_read_dword(dev, REG_PCI_STSCMD, &val32);
+	if (val32 & PCI_STSCMD_CLEAR_MASK) {
+		printk(KERN_INFO "Error(s) in PCI bridge status and command"
+			"register on device %s\n", pci_info->ctl_name);
+		printk(KERN_INFO "SSE: %d, RMA: %d, RTA: %d\n",
+			(val32 & PCI_STSCMD_SSE) != 0,
+			(val32 & PCI_STSCMD_RMA) != 0,
+			(val32 & PCI_STSCMD_RTA) != 0);
+
+		val32 |= PCI_STSCMD_CLEAR_MASK;
+		edac_pci_write_dword(dev, REG_PCI_STSCMD, val32);
+
+		edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
+	}
+
+	/* Check out HyperTransport Link Control Register */
+	edac_pci_read_dword(dev, REG_HT_LINK, &val32);
+	if (val32 & HT_LINK_LKFAIL) {
+		printk(KERN_INFO "Error(s) in hypertransport link control"
+			"register on device %s\n", pci_info->ctl_name);
+		printk(KERN_INFO "LKFAIL: %d\n",
+			(val32 & HT_LINK_LKFAIL) != 0);
+
+		val32 |= HT_LINK_LKFAIL;
+		edac_pci_write_dword(dev, REG_HT_LINK, val32);
+
+		edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
+	}
+
+	/* Check out PCI Interrupt and Bridge Control Register */
+	edac_pci_read_dword(dev, REG_PCI_INTBRG_CTRL, &val32);
+	if (val32 & PCI_INTBRG_CTRL_DTSTAT) {
+		printk(KERN_INFO "Error(s) in PCI interrupt and bridge control"
+			"register on device %s\n", pci_info->ctl_name);
+		printk(KERN_INFO "DTSTAT: %d\n",
+			(val32 & PCI_INTBRG_CTRL_DTSTAT) != 0);
+
+		val32 |= PCI_INTBRG_CTRL_DTSTAT;
+		edac_pci_write_dword(dev, REG_PCI_INTBRG_CTRL, val32);
+
+		edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
+	}
+
+	/* Check out PCI Bridge Memory Base-Limit Register */
+	edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
+	if (val32 & MEM_LIMIT_CLEAR_MASK) {
+		printk(KERN_INFO
+			"Error(s) in mem limit register on %s device\n",
+			pci_info->ctl_name);
+		printk(KERN_INFO "DPE: %d, RSE: %d, RMA: %d\n"
+			"RTA: %d, STA: %d, MDPE: %d\n",
+			(val32 & MEM_LIMIT_DPE)  != 0,
+			(val32 & MEM_LIMIT_RSE)  != 0,
+			(val32 & MEM_LIMIT_RMA)  != 0,
+			(val32 & MEM_LIMIT_RTA)  != 0,
+			(val32 & MEM_LIMIT_STA)  != 0,
+			(val32 & MEM_LIMIT_MDPE) != 0);
+
+		val32 |= MEM_LIMIT_CLEAR_MASK;
+		edac_pci_write_dword(dev, REG_MEM_LIM, val32);
+
+		edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
+	}
+}
+
+static struct resource *legacy_io_res;
+static int at_compat_reg_broken;
+#define LEGACY_NR_PORTS	1
+
+/* device-specific methods for amd8111 LPC Bridge device */
+static void amd8111_lpc_bridge_init(struct amd8111_dev_info *dev_info)
+{
+	u8 val8;
+	struct pci_dev *dev = dev_info->dev;
+
+	/* First clear REG_AT_COMPAT[SERR, IOCHK] if necessary */
+	legacy_io_res = request_region(REG_AT_COMPAT, LEGACY_NR_PORTS,
+					AMD8111_EDAC_MOD_STR);
+	if (!legacy_io_res)
+		printk(KERN_INFO "%s: failed to request legacy I/O region "
+			"start %d, len %d\n", __func__,
+			REG_AT_COMPAT, LEGACY_NR_PORTS);
+	else {
+		val8 = __do_inb(REG_AT_COMPAT);
+		if (val8 == 0xff) { /* buggy port */
+			printk(KERN_INFO "%s: port %d is buggy, not supported"
+				" by hardware?\n", __func__, REG_AT_COMPAT);
+			at_compat_reg_broken = 1;
+			release_region(REG_AT_COMPAT, LEGACY_NR_PORTS);
+			legacy_io_res = NULL;
+		} else {
+			u8 out8 = 0;
+			if (val8 & AT_COMPAT_SERR)
+				out8 = AT_COMPAT_CLRSERR;
+			if (val8 & AT_COMPAT_IOCHK)
+				out8 |= AT_COMPAT_CLRIOCHK;
+			if (out8 > 0)
+				__do_outb(out8, REG_AT_COMPAT);
+		}
+	}
+
+	/* Second clear error flags on LPC bridge */
+	edac_pci_read_byte(dev, REG_IO_CTRL_1, &val8);
+	if (val8 & IO_CTRL_1_CLEAR_MASK)
+		edac_pci_write_byte(dev, REG_IO_CTRL_1, val8);
+}
+
+static void amd8111_lpc_bridge_exit(struct amd8111_dev_info *dev_info)
+{
+	if (legacy_io_res)
+		release_region(REG_AT_COMPAT, LEGACY_NR_PORTS);
+}
+
+static void amd8111_lpc_bridge_check(struct edac_device_ctl_info *edac_dev)
+{
+	struct amd8111_dev_info *dev_info = edac_dev->pvt_info;
+	struct pci_dev *dev = dev_info->dev;
+	u8 val8;
+
+	edac_pci_read_byte(dev, REG_IO_CTRL_1, &val8);
+	if (val8 & IO_CTRL_1_CLEAR_MASK) {
+		printk(KERN_INFO
+			"Error(s) in IO control register on %s device\n",
+			dev_info->ctl_name);
+		printk(KERN_INFO "LPC ERR: %d, PW2LPC: %d\n",
+			(val8 & IO_CTRL_1_LPC_ERR) != 0,
+			(val8 & IO_CTRL_1_PW2LPC) != 0);
+
+		val8 |= IO_CTRL_1_CLEAR_MASK;
+		edac_pci_write_byte(dev, REG_IO_CTRL_1, val8);
+
+		edac_device_handle_ue(edac_dev, 0, 0, edac_dev->ctl_name);
+	}
+
+	if (at_compat_reg_broken == 0) {
+		u8 out8 = 0;
+		val8 = __do_inb(REG_AT_COMPAT);
+		if (val8 & AT_COMPAT_SERR)
+			out8 = AT_COMPAT_CLRSERR;
+		if (val8 & AT_COMPAT_IOCHK)
+			out8 |= AT_COMPAT_CLRIOCHK;
+		if (out8 > 0) {
+			__do_outb(out8, REG_AT_COMPAT);
+			edac_device_handle_ue(edac_dev, 0, 0,
+						edac_dev->ctl_name);
+		}
+	}
+}
+
+/* General devices represented by edac_device_ctl_info */
+static struct amd8111_dev_info amd8111_devices[] = {
+	[LPC_BRIDGE] = {
+		.err_dev = PCI_DEVICE_ID_AMD_8111_LPC,
+		.ctl_name = "lpc",
+		.init = amd8111_lpc_bridge_init,
+		.exit = amd8111_lpc_bridge_exit,
+		.check = amd8111_lpc_bridge_check,
+	},
+	{0},
+};
+
+/* PCI controllers represented by edac_pci_ctl_info */
+static struct amd8111_pci_info amd8111_pcis[] = {
+	[PCI_BRIDGE] = {
+		.err_dev = PCI_DEVICE_ID_AMD_8111_PCI,
+		.ctl_name = "AMD8111_PCI_Controller",
+		.init = amd8111_pci_bridge_init,
+		.exit = amd8111_pci_bridge_exit,
+		.check = amd8111_pci_bridge_check,
+	},
+	{0},
+};
+
+static int amd8111_dev_probe(struct pci_dev *dev,
+				const struct pci_device_id *id)
+{
+	struct amd8111_dev_info *dev_info = &amd8111_devices[id->driver_data];
+
+	dev_info->dev = pci_get_device(PCI_VENDOR_ID_AMD,
+					dev_info->err_dev, NULL);
+
+	if (!dev_info->dev) {
+		printk(KERN_ERR "EDAC device not found:"
+			"vendor %x, device %x, name %s\n",
+			PCI_VENDOR_ID_AMD, dev_info->err_dev,
+			dev_info->ctl_name);
+		return -ENODEV;
+	}
+
+	if (pci_enable_device(dev_info->dev)) {
+		pci_dev_put(dev_info->dev);
+		printk(KERN_ERR "failed to enable:"
+			"vendor %x, device %x, name %s\n",
+			PCI_VENDOR_ID_AMD, dev_info->err_dev,
+			dev_info->ctl_name);
+		return -ENODEV;
+	}
+
+	/*
+	 * we do not allocate extra private structure for
+	 * edac_device_ctl_info, but make use of existing
+	 * one instead.
+	*/
+	dev_info->edac_idx = edac_dev_idx++;
+	dev_info->edac_dev =
+		edac_device_alloc_ctl_info(0, dev_info->ctl_name, 1,
+					   NULL, 0, 0,
+					   NULL, 0, dev_info->edac_idx);
+	if (!dev_info->edac_dev)
+		return -ENOMEM;
+
+	dev_info->edac_dev->pvt_info = dev_info;
+	dev_info->edac_dev->dev = &dev_info->dev->dev;
+	dev_info->edac_dev->mod_name = AMD8111_EDAC_MOD_STR;
+	dev_info->edac_dev->ctl_name = dev_info->ctl_name;
+	dev_info->edac_dev->dev_name = dev_info->dev->dev.bus_id;
+
+	if (edac_op_state == EDAC_OPSTATE_POLL)
+		dev_info->edac_dev->edac_check = dev_info->check;
+
+	if (dev_info->init)
+		dev_info->init(dev_info);
+
+	if (edac_device_add_device(dev_info->edac_dev) > 0) {
+		printk(KERN_ERR "failed to add edac_dev for %s\n",
+			dev_info->ctl_name);
+		edac_device_free_ctl_info(dev_info->edac_dev);
+		return -ENODEV;
+	}
+
+	printk(KERN_INFO "added one edac_dev on AMD8111 "
+		"vendor %x, device %x, name %s\n",
+		PCI_VENDOR_ID_AMD, dev_info->err_dev,
+		dev_info->ctl_name);
+
+	return 0;
+}
+
+static void amd8111_dev_remove(struct pci_dev *dev)
+{
+	struct amd8111_dev_info *dev_info;
+
+	for (dev_info = amd8111_devices; dev_info->err_dev; dev_info++)
+		if (dev_info->dev->device == dev->device)
+			break;
+
+	if (!dev_info->err_dev)	/* should never happen */
+		return;
+
+	if (dev_info->edac_dev) {
+		edac_device_del_device(dev_info->edac_dev->dev);
+		edac_device_free_ctl_info(dev_info->edac_dev);
+	}
+
+	if (dev_info->exit)
+		dev_info->exit(dev_info);
+
+	pci_dev_put(dev_info->dev);
+}
+
+static int amd8111_pci_probe(struct pci_dev *dev,
+				const struct pci_device_id *id)
+{
+	struct amd8111_pci_info *pci_info = &amd8111_pcis[id->driver_data];
+
+	pci_info->dev = pci_get_device(PCI_VENDOR_ID_AMD,
+					pci_info->err_dev, NULL);
+
+	if (!pci_info->dev) {
+		printk(KERN_ERR "EDAC device not found:"
+			"vendor %x, device %x, name %s\n",
+			PCI_VENDOR_ID_AMD, pci_info->err_dev,
+			pci_info->ctl_name);
+		return -ENODEV;
+	}
+
+	if (pci_enable_device(pci_info->dev)) {
+		pci_dev_put(pci_info->dev);
+		printk(KERN_ERR "failed to enable:"
+			"vendor %x, device %x, name %s\n",
+			PCI_VENDOR_ID_AMD, pci_info->err_dev,
+			pci_info->ctl_name);
+		return -ENODEV;
+	}
+
+	/*
+	 * we do not allocate extra private structure for
+	 * edac_pci_ctl_info, but make use of existing
+	 * one instead.
+	*/
+	pci_info->edac_idx = edac_pci_alloc_index();
+	pci_info->edac_dev = edac_pci_alloc_ctl_info(0, pci_info->ctl_name);
+	if (!pci_info->edac_dev)
+		return -ENOMEM;
+
+	pci_info->edac_dev->pvt_info = pci_info;
+	pci_info->edac_dev->dev = &pci_info->dev->dev;
+	pci_info->edac_dev->mod_name = AMD8111_EDAC_MOD_STR;
+	pci_info->edac_dev->ctl_name = pci_info->ctl_name;
+	pci_info->edac_dev->dev_name = pci_info->dev->dev.bus_id;
+
+	if (edac_op_state == EDAC_OPSTATE_POLL)
+		pci_info->edac_dev->edac_check = pci_info->check;
+
+	if (pci_info->init)
+		pci_info->init(pci_info);
+
+	if (edac_pci_add_device(pci_info->edac_dev, pci_info->edac_idx) > 0) {
+		printk(KERN_ERR "failed to add edac_pci for %s\n",
+			pci_info->ctl_name);
+		edac_pci_free_ctl_info(pci_info->edac_dev);
+		return -ENODEV;
+	}
+
+	printk(KERN_INFO "added one edac_pci on AMD8111 "
+		"vendor %x, device %x, name %s\n",
+		PCI_VENDOR_ID_AMD, pci_info->err_dev,
+		pci_info->ctl_name);
+
+	return 0;
+}
+
+static void amd8111_pci_remove(struct pci_dev *dev)
+{
+	struct amd8111_pci_info *pci_info;
+
+	for (pci_info = amd8111_pcis; pci_info->err_dev; pci_info++)
+		if (pci_info->dev->device == dev->device)
+			break;
+
+	if (!pci_info->err_dev)	/* should never happen */
+		return;
+
+	if (pci_info->edac_dev) {
+		edac_pci_del_device(pci_info->edac_dev->dev);
+		edac_pci_free_ctl_info(pci_info->edac_dev);
+	}
+
+	if (pci_info->exit)
+		pci_info->exit(pci_info);
+
+	pci_dev_put(pci_info->dev);
+}
+
+/* PCI Device ID talbe for general EDAC device */
+static const struct pci_device_id amd8111_edac_dev_tbl[] = {
+	{
+	PCI_VEND_DEV(AMD, 8111_LPC),
+	.subvendor = PCI_ANY_ID,
+	.subdevice = PCI_ANY_ID,
+	.class = 0,
+	.class_mask = 0,
+	.driver_data = LPC_BRIDGE,
+	},
+	{
+	0,
+	}			/* table is NULL-terminated */
+};
+MODULE_DEVICE_TABLE(pci, amd8111_edac_dev_tbl);
+
+static struct pci_driver amd8111_edac_dev_driver = {
+	.name = "AMD8111_EDAC_DEV",
+	.probe = amd8111_dev_probe,
+	.remove = amd8111_dev_remove,
+	.id_table = amd8111_edac_dev_tbl,
+};
+
+/* PCI Device ID table for EDAC PCI controller */
+static const struct pci_device_id amd8111_edac_pci_tbl[] = {
+	{
+	PCI_VEND_DEV(AMD, 8111_PCI),
+	.subvendor = PCI_ANY_ID,
+	.subdevice = PCI_ANY_ID,
+	.class = 0,
+	.class_mask = 0,
+	.driver_data = PCI_BRIDGE,
+	},
+	{
+	0,
+	}			/* table is NULL-terminated */
+};
+MODULE_DEVICE_TABLE(pci, amd8111_edac_pci_tbl);
+
+static struct pci_driver amd8111_edac_pci_driver = {
+	.name = "AMD8111_EDAC_PCI",
+	.probe = amd8111_pci_probe,
+	.remove = amd8111_pci_remove,
+	.id_table = amd8111_edac_pci_tbl,
+};
+
+static int __init amd8111_edac_init(void)
+{
+	int val;
+
+	printk(KERN_INFO "AMD8111 EDAC driver "	AMD8111_EDAC_REVISION "\n");
+	printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc.\n");
+
+	/* Only POLL mode supported so far */
+	edac_op_state = EDAC_OPSTATE_POLL;
+
+	val = pci_register_driver(&amd8111_edac_dev_driver);
+	val |= pci_register_driver(&amd8111_edac_pci_driver);
+
+	return val;
+}
+
+static void __exit amd8111_edac_exit(void)
+{
+	pci_unregister_driver(&amd8111_edac_pci_driver);
+	pci_unregister_driver(&amd8111_edac_dev_driver);
+}
+
+
+module_init(amd8111_edac_init);
+module_exit(amd8111_edac_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>\n");
+MODULE_DESCRIPTION("AMD8111 HyperTransport I/O Hub EDAC kernel module");