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/*
* amd8131_edac.c, AMD8131 hypertransport 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/io.h>
#include <linux/bitops.h>
#include <linux/edac.h>
#include <linux/pci_ids.h>
#include "edac_core.h"
#include "edac_module.h"
#include "amd8131_edac.h"
#define AMD8131_EDAC_REVISION " Ver: 1.0.0"
#define AMD8131_EDAC_MOD_STR "amd8131_edac"
/* Wrapper functions for accessing PCI configuration space */
static void 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 AMD8131_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 AMD8131_EDAC_MOD_STR
" PCI Access Write Error at 0x%x\n", reg);
}
static char * const bridge_str[] = {
[NORTH_A] = "NORTH A",
[NORTH_B] = "NORTH B",
[SOUTH_A] = "SOUTH A",
[SOUTH_B] = "SOUTH B",
[NO_BRIDGE] = "NO BRIDGE",
};
/* Support up to two AMD8131 chipsets on a platform */
static struct amd8131_dev_info amd8131_devices[] = {
{
.inst = NORTH_A,
.devfn = DEVFN_PCIX_BRIDGE_NORTH_A,
.ctl_name = "AMD8131_PCIX_NORTH_A",
},
{
.inst = NORTH_B,
.devfn = DEVFN_PCIX_BRIDGE_NORTH_B,
.ctl_name = "AMD8131_PCIX_NORTH_B",
},
{
.inst = SOUTH_A,
.devfn = DEVFN_PCIX_BRIDGE_SOUTH_A,
.ctl_name = "AMD8131_PCIX_SOUTH_A",
},
{
.inst = SOUTH_B,
.devfn = DEVFN_PCIX_BRIDGE_SOUTH_B,
.ctl_name = "AMD8131_PCIX_SOUTH_B",
},
{.inst = NO_BRIDGE,},
};
static void amd8131_pcix_init(struct amd8131_dev_info *dev_info)
{
u32 val32;
struct pci_dev *dev = dev_info->dev;
/* First clear error detection flags */
edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
if (val32 & MEM_LIMIT_MASK)
edac_pci_write_dword(dev, REG_MEM_LIM, val32);
/* Clear Discard Timer Timedout flag */
edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
if (val32 & INT_CTLR_DTS)
edac_pci_write_dword(dev, REG_INT_CTLR, val32);
/* Clear CRC Error flag on link side A */
edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
if (val32 & LNK_CTRL_CRCERR_A)
edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
/* Clear CRC Error flag on link side B */
edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
if (val32 & LNK_CTRL_CRCERR_B)
edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
/*
* Then enable all error detections.
*
* Setup Discard Timer Sync Flood Enable,
* System Error Enable and Parity Error Enable.
*/
edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
val32 |= INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE;
edac_pci_write_dword(dev, REG_INT_CTLR, val32);
/* Enable overall SERR Error detection */
edac_pci_read_dword(dev, REG_STS_CMD, &val32);
val32 |= STS_CMD_SERREN;
edac_pci_write_dword(dev, REG_STS_CMD, val32);
/* Setup CRC Flood Enable for link side A */
edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
val32 |= LNK_CTRL_CRCFEN;
edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
/* Setup CRC Flood Enable for link side B */
edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
val32 |= LNK_CTRL_CRCFEN;
edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
}
static void amd8131_pcix_exit(struct amd8131_dev_info *dev_info)
{
u32 val32;
struct pci_dev *dev = dev_info->dev;
/* Disable SERR, PERR and DTSE Error detection */
edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
val32 &= ~(INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE);
edac_pci_write_dword(dev, REG_INT_CTLR, val32);
/* Disable overall System Error detection */
edac_pci_read_dword(dev, REG_STS_CMD, &val32);
val32 &= ~STS_CMD_SERREN;
edac_pci_write_dword(dev, REG_STS_CMD, val32);
/* Disable CRC Sync Flood on link side A */
edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
val32 &= ~LNK_CTRL_CRCFEN;
edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
/* Disable CRC Sync Flood on link side B */
edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
val32 &= ~LNK_CTRL_CRCFEN;
edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
}
static void amd8131_pcix_check(struct edac_pci_ctl_info *edac_dev)
{
struct amd8131_dev_info *dev_info = edac_dev->pvt_info;
struct pci_dev *dev = dev_info->dev;
u32 val32;
/* Check PCI-X Bridge Memory Base-Limit Register for errors */
edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
if (val32 & MEM_LIMIT_MASK) {
printk(KERN_INFO "Error(s) in mem limit register "
"on %s bridge\n", dev_info->ctl_name);
printk(KERN_INFO "DPE: %d, RSE: %d, RMA: %d\n"
"RTA: %d, STA: %d, MDPE: %d\n",
val32 & MEM_LIMIT_DPE,
val32 & MEM_LIMIT_RSE,
val32 & MEM_LIMIT_RMA,
val32 & MEM_LIMIT_RTA,
val32 & MEM_LIMIT_STA,
val32 & MEM_LIMIT_MDPE);
val32 |= MEM_LIMIT_MASK;
edac_pci_write_dword(dev, REG_MEM_LIM, val32);
edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
}
/* Check if Discard Timer timed out */
edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
if (val32 & INT_CTLR_DTS) {
printk(KERN_INFO "Error(s) in interrupt and control register "
"on %s bridge\n", dev_info->ctl_name);
printk(KERN_INFO "DTS: %d\n", val32 & INT_CTLR_DTS);
val32 |= INT_CTLR_DTS;
edac_pci_write_dword(dev, REG_INT_CTLR, val32);
edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
}
/* Check if CRC error happens on link side A */
edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
if (val32 & LNK_CTRL_CRCERR_A) {
printk(KERN_INFO "Error(s) in link conf and control register "
"on %s bridge\n", dev_info->ctl_name);
printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_A);
val32 |= LNK_CTRL_CRCERR_A;
edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
}
/* Check if CRC error happens on link side B */
edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
if (val32 & LNK_CTRL_CRCERR_B) {
printk(KERN_INFO "Error(s) in link conf and control register "
"on %s bridge\n", dev_info->ctl_name);
printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_B);
val32 |= LNK_CTRL_CRCERR_B;
edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
}
}
static struct amd8131_info amd8131_chipset = {
.err_dev = PCI_DEVICE_ID_AMD_8131_APIC,
.devices = amd8131_devices,
.init = amd8131_pcix_init,
.exit = amd8131_pcix_exit,
.check = amd8131_pcix_check,
};
/*
* There are 4 PCIX Bridges on ATCA-6101 that share the same PCI Device ID,
* so amd8131_probe() would be called by kernel 4 times, with different
* address of pci_dev for each of them each time.
*/
static int amd8131_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
struct amd8131_dev_info *dev_info;
for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
dev_info++)
if (dev_info->devfn == dev->devfn)
break;
if (dev_info->inst == NO_BRIDGE) /* should never happen */
return -ENODEV;
/*
* We can't call pci_get_device() as we are used to do because
* there are 4 of them but pci_dev_get() instead.
*/
dev_info->dev = pci_dev_get(dev);
if (pci_enable_device(dev_info->dev)) {
pci_dev_put(dev_info->dev);
printk(KERN_ERR "failed to enable:"
"vendor %x, device %x, devfn %x, name %s\n",
PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
dev_info->devfn, dev_info->ctl_name);
return -ENODEV;
}
/*
* we do not allocate extr
|