/*
* AMD 76x Memory Controller kernel module
* (C) 2003 Linux Networx (http://lnxi.com)
* This file may be distributed under the terms of the
* GNU General Public License.
*
* Written by Thayne Harbaugh
* Based on work by Dan Hollis <goemon at anime dot net> and others.
* http://www.anime.net/~goemon/linux-ecc/
*
* $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include "edac_core.h"
#define AMD76X_REVISION " Ver: 2.0.2 " __DATE__
#define EDAC_MOD_STR "amd76x_edac"
#define amd76x_printk(level, fmt, arg...) \
edac_printk(level, "amd76x", fmt, ##arg)
#define amd76x_mc_printk(mci, level, fmt, arg...) \
edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)
#define AMD76X_NR_CSROWS 8
#define AMD76X_NR_CHANS 1
#define AMD76X_NR_DIMMS 4
/* AMD 76x register addresses - device 0 function 0 - PCI bridge */
#define AMD76X_ECC_MODE_STATUS 0x48 /* Mode and status of ECC (32b)
*
* 31:16 reserved
* 15:14 SERR enabled: x1=ue 1x=ce
* 13 reserved
* 12 diag: disabled, enabled
* 11:10 mode: dis, EC, ECC, ECC+scrub
* 9:8 status: x1=ue 1x=ce
* 7:4 UE cs row
* 3:0 CE cs row
*/
#define AMD76X_DRAM_MODE_STATUS 0x58 /* DRAM Mode and status (32b)
*
* 31:26 clock disable 5 - 0
* 25 SDRAM init
* 24 reserved
* 23 mode register service
* 22:21 suspend to RAM
* 20 burst refresh enable
* 19 refresh disable
* 18 reserved
* 17:16 cycles-per-refresh
* 15:8 reserved
* 7:0 x4 mode enable 7 - 0
*/
#define AMD76X_MEM_BASE_ADDR 0xC0 /* Memory base address (8 x 32b)
*
* 31:23 chip-select base
* 22:16 reserved
* 15:7 chip-select mask
* 6:3 reserved
* 2:1 address mode
* 0 chip-select enable
*/
struct amd76x_error_info {
u32 ecc_mode_status;
};
enum amd76x_chips {
AMD761 = 0,
AMD762
};
struct amd76x_dev_info {
const char *ctl_name;
};
static const struct amd76x_dev_info amd76x_devs[] = {
[AMD761] = {
.ctl_name = "AMD761"},
[AMD762] = {
.ctl_name = "AMD762"},
};
static struct edac_pci_ctl_info *amd76x_pci;
/**
* amd76x_get_error_info - fetch error information
* @mci: Memory controller
* @info: Info to fill in
*
* Fetch and store the AMD76x ECC status. Clear pending status
* on the chip so that further errors will be reported
*/
static void amd76x_get_error_info(struct mem_ctl_info *mci,
struct amd76x_error_info *info)
{
struct pci_dev *pdev;
pdev = to_pci_dev(mci->dev);
pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS,
&info->ecc_mode_status);
if (info->ecc_mode_status & BIT(8))
pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
(u32) BIT(8), (u32) BIT(8));
if (info->ecc_mode_status & BIT(9))
pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
(u32) BIT(9), (u32) BIT(9));
}
/**
* amd76x_process_error_info - Error check
* @mci: Memory controller
* @info: Previously fetched information from chip
* @handle_errors: 1 if we should do recovery
*
* Process the chip state and decide if an error has occurred.
* A return of 1 indicates an error. Also if handle_errors is true
* then attempt to handle and clean up after the error
*/
static int amd76x_process_error_info(struct mem_ctl_info *mci,
struct amd76x_error_info *info,
int handle_errors)
{
int error_found;
u32 row;
error_found = 0;
/*
* Check for an uncorrectable error
*/
if (info->ecc_mode_status & BIT(8)) {
error_found = 1;
if (handle_errors) {
row = (info->ecc_mode_status >> 4) & 0xf;
edac_mc_handle_ue(mci, mci->csrows[row].first_page, 0,
row, mci->ctl_name);
}
}
/*
* Check for a correctable error
*/
if (info->ecc_mode_status & BIT(9)) {
error_found = 1;
if (handle_errors) {
row = info->ecc_mode_status & 0xf;
edac_mc_handle_ce(mci, mci->csrows[row].first_page, 0,
0, row, 0, mci->ctl_name);
}
}
return error_found;
}
/**
* amd76x_check - Poll the controller
* @mci: Memory controller
*
* Called by the poll handlers this function reads the status
* from the controller and checks for errors.
*/
static void amd76x_check(struct mem_ctl_info *mci)
{
struct amd76x_error_info info;
debugf3("%s()\n", __func__);
amd76x_get_error_info(mci, &info);
amd76x_process_error_info(mci, &info, 1);
}
static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
enum edac_type edac_mode)
{
struct csrow_info *csrow;
u32 mba, mba_base, mba_mask, dms;
int index;
for (index = 0; index < mci->nr_csrows; index++) {
csrow = &mci->csrows[index];
/* find the DRAM Chip Select Base address and mask */
pci_read_config_dword(pdev,
AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
if (!(mba & BIT(0)))
continue;
mba_base = mba & 0xff800000UL;
mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
csrow->first_page = mba_base >> PAGE_SHIFT;
csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
csrow->page_mask = mba_mask >> PAGE_SHIFT;
csrow->grain = csrow->nr_pages << PAGE_SHIFT;
csrow->mtype = MEM_RDDR;
csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
csrow->edac_mode = edac_mode;
}
}
/**
* amd76x_probe1 - Perform set up for detected device
* @pdev; PCI device detected
* @dev_idx: Device type index
*
* We have found an AMD76x and now need to set up the memory
* controller status reporting. We configure and set up the
* memory controller reporting and claim the device.
*/
static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
{
static const enum edac_type ems_modes[] = {
EDAC_NONE,
EDAC_EC,
EDAC_SECDED,
EDAC_SECDED
};
struct mem_ctl_info *mci = NULL;
u32 ems;
u32 ems_mode;
struct amd76x_error_info discard;
debugf0("%s()\n", __func__);
pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
ems_mode = (ems >> 10) & 0x3;
mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS, 0);
if (mci == NULL) {
return -ENOMEM;
}
debugf0("%s(): mci = %p\n", __func__, mci);
mci->dev = &pdev->dev;
mci->mtype_cap = MEM_FLAG_RDDR;
mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
mci->edac_cap = ems_mode ?
(EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
mci->mod_name = EDAC_MOD_STR;
mci->mod_ver = AMD76X_REVISION;
mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
mci->dev_name = pci_name(pdev);
mci->edac_check = amd76x_check;
mci->ctl_page_to_phys = NULL;
amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
amd76x_get_error_info(mci, &discard); /* clear counters */
/* Here we assume that we will never see multiple instances of this
* type of memory controller. The ID is therefore hardcoded to 0.
*/
if (edac_mc_add_mc(mci)) {
debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
goto fail;
}
/* allocating generic PCI control info */
amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
if (!amd76x_pci) {
printk(KERN_WARNING
"%s(): Unable to create PCI control\n",
__func__);
printk(KERN_WARNING
"%s(): PCI error report via EDAC not setup\n",
__func__);
}
/* get this far and it's successful */
debugf3("%s(): success\n", __func__);
return 0;
fail:
edac_mc_free(mci);
return -ENODEV;
}
/* returns count (>= 0), or negative on error */
static int __devinit amd76x_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
debugf0("%s()\n", __func__);
/* don't need to call pci_device_enable() */
return amd76x_probe1(pdev, ent->driver_data);
}
/**
* amd76x_remove_one - driver shutdown
* @pdev: PCI device being handed back
*
* Called when the driver is unloaded. Find the matching mci
* structure for the device then delete the mci and free the
* resources.
*/
static void __devexit amd76x_remove_one(struct pci_dev *pdev)
{
struct mem_ctl_info *mci;
debugf0("%s()\n", __func__);
if (amd76x_pci)
edac_pci_release_generic_ctl(amd76x_pci);
if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
return;
edac_mc_free(mci);
}
static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = {
{
PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
AMD762},
{
PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
AMD761},
{
0,
} /* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
static struct pci_driver amd76x_driver = {
.name = EDAC_MOD_STR,
.probe = amd76x_init_one,
.remove = __devexit_p(amd76x_remove_one),
.id_table = amd76x_pci_tbl,
};
static int __init amd76x_init(void)
{
return pci_register_driver(&amd76x_driver);
}
static void __exit amd76x_exit(void)
{
pci_unregister_driver(&amd76x_driver);
}
module_init(amd76x_init);
module_exit(amd76x_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
