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/*
* Intel 82860 Memory Controller kernel module
* (C) 2005 Red Hat (http://www.redhat.com)
* This file may be distributed under the terms of the
* GNU General Public License.
*
* Written by Ben Woodard <woodard@redhat.com>
* shamelessly copied from and based upon the edac_i82875 driver
* by Thayne Harbaugh of Linux Networx. (http://lnxi.com)
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/edac.h>
#include "edac_module.h"
#define EDAC_MOD_STR "i82860_edac"
#define i82860_printk(level, fmt, arg...) \
edac_printk(level, "i82860", fmt, ##arg)
#define i82860_mc_printk(mci, level, fmt, arg...) \
edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg)
#ifndef PCI_DEVICE_ID_INTEL_82860_0
#define PCI_DEVICE_ID_INTEL_82860_0 0x2531
#endif /* PCI_DEVICE_ID_INTEL_82860_0 */
#define I82860_MCHCFG 0x50
#define I82860_GBA 0x60
#define I82860_GBA_MASK 0x7FF
#define I82860_GBA_SHIFT 24
#define I82860_ERRSTS 0xC8
#define I82860_EAP 0xE4
#define I82860_DERRCTL_STS 0xE2
enum i82860_chips {
I82860 = 0,
};
struct i82860_dev_info {
const char *ctl_name;
};
struct i82860_error_info {
u16 errsts;
u32 eap;
u16 derrsyn;
u16 errsts2;
};
static const struct i82860_dev_info i82860_devs[] = {
[I82860] = {
.ctl_name = "i82860"},
};
static struct pci_dev *mci_pdev; /* init dev: in case that AGP code
* has already registered driver
*/
static struct edac_pci_ctl_info *i82860_pci;
static void i82860_get_error_info(struct mem_ctl_info *mci,
struct i82860_error_info *info)
{
struct pci_dev *pdev;
pdev = to_pci_dev(mci->pdev);
/*
* This is a mess because there is no atomic way to read all the
* registers at once and the registers can transition from CE being
* overwritten by UE.
*/
pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts);
pci_read_config_dword(pdev, I82860_EAP, &info->eap);
pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2);
pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003);
/*
* If the error is the same for both reads then the first set of reads
* is valid. If there is a change then there is a CE no info and the
* second set of reads is valid and should be UE info.
*/
if (!(info->errsts2 & 0x0003))
return;
if ((info->errsts ^ info->errsts2) & 0x0003) {
pci_read_config_dword(pdev, I82860_EAP, &info->eap);
pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
}
}
static int i82860_process_error_info(struct mem_ctl_info *mci,
struct i82860_error_info *info,
int handle_errors)
{
struct dimm_info *dimm;
int row;
if (!(info->errsts2 & 0x0003))
return 0;
if (!handle_errors)
return 1;
if ((info->errsts ^ info->errsts2) & 0x0003) {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
-1, -1, -1, "UE overwrote CE", "");
info->errsts = info->errsts2;
}
info->eap >>= PAGE_SHIFT;
row = edac_mc_find_csrow_by_page(mci, info->eap);
dimm = mci->csrows[row]->channels[0]->dimm;
if (info->errsts & 0x0002)
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
info->eap, 0, 0,
dimm->location[0], dimm->location[1], -1,
"i82860 UE", "");
else
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
info->eap, 0, info->derrsyn,
dimm->location[0], dimm->location[1], -1,
"i82860 CE", "");
return 1;
}
static void i82860_check(struct mem_ctl_info *mci)
{
struct i82860_error_info info;
edac_dbg(1, "MC%d\n", mci->mc_idx);
i82860_get_error_info(mci, &info);
i82860_process_error_info(mci, &info, 1);
}
static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev)
{
unsigned long last_cumul_size;
u16 mchcfg_ddim; /* DRAM Data Integrity Mode 0=none, 2=edac */
u16 value;
u32 cumul_size;
struct csrow_info *csrow;
struct dimm_info *dimm;
int index;
pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim);
mchcfg_ddim = mchcfg_ddim & 0x180;
last_cumul_size = 0;
/* The group row boundary (GRA) reg values are boundary address
* for each DRAM row with a granularity of 16MB. GRA regs are
* cumulative; therefore GRA15 will contain the total memory contained
* in all eight rows.
*/
for (index = 0; index < mci->nr_csrows; index++) {
csrow = mci->csrows[index];
dimm = csrow->channels[0]->dimm;
pci_read_config_word(pdev, I82860_GBA + index * 2, &value);
cumul_size = (value & I82860_GBA_MASK) <<
(I82860_GBA_SHIFT - PAGE_SHIFT);
edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
if (cumul_size == last_cumul_size)
continue; /* not populated */
csrow->first_page = last_cumul_size;
csrow->last_page = cumul_size - 1;
dimm->nr_pages = cumul_size - last_cumul_size;
last_cumul_size = cumul_size;
dimm->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */
dimm->mtype = MEM_RMBS;
dimm->dtype = DEV_UNKNOWN;
dimm->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
}
}
static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
{
struct mem_ctl_info *mci;
struct edac_mc_layer layers[2];
struct i82860_error_info discard;
/*
* RDRAM has channels but these don't map onto the csrow abstraction.
* According with the datasheet, there are 2 Rambus channels, supporting
* up to 16 direct RDRAM devices.
* The device groups from the GRA registers seem to map reasonably
* well onto the notion of a chip select row.
* There are 16 GRA registers and since the name is associated with
* the channel and the GRA registers map to physical devices so we are
* going to make 1 channel for group.
*/
layers[0].type = EDAC_MC_LAYER_CHANNEL;
layers[0].size = 2;
layers[0].is_virt_csrow = true;
layers[1].type = EDAC_MC_LAYER_SLOT;
layers[1].size = 8;
layers[1].is_virt_csrow = true;
mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
if (!mci)
return -ENOMEM;
edac_dbg(3, "init mci\n");
mci->pdev = &pdev->dev;
mci->mtype_cap = MEM_FLAG_DDR;
mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
/* I"m not sure about this but I think that all RDRAM is SECDED */
mci->edac_cap = EDAC_FLAG_SECDED;
mci->mod_name = EDAC_MOD_STR;
mci->ctl_name = i82860_devs[dev_idx].ctl_name;
mci->dev_name = pci_name(pdev);
mci->edac_check = i82860_check;
mci->ctl_page_to_phys = NULL;
i82860_init_csrows(mci, pdev);
i82860_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)) {
edac_dbg(3, "failed edac_mc_add_mc()\n");
goto fail;
}
/* allocating generic PCI control info */
i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
if (!i82860_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 */
edac_dbg(3, "success\n");
return 0;
fail:
edac_mc_free(mci);
return -ENODEV;
}
/* returns count (>= 0), or negative on error */
static int i82860_init_one(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int rc;
edac_dbg(0, "\n");
i82860_printk(KERN_INFO, "i82860 init one\n");
if (pci_enable_device(pdev) < 0)
return -EIO;
rc = i82860_probe1(pdev, ent->driver_data);
if (rc == 0)
mci_pdev = pci_dev_get(pdev);
return rc;
}
static void i82860_remove_one(struct pci_dev *pdev)
{
struct mem_ctl_info *mci;
edac_dbg(0, "\n");
if (i82860_pci)
edac_pci_release_generic_ctl(i82860_pci);
if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
return;
edac_mc_free(mci);
}
static const struct pci_device_id i82860_pci_tbl[] = {
{
PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
I82860},
{
0,
} /* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, i82860_pci_tbl);
static struct pci_driver i82860_driver = {
.name = EDAC_MOD_STR,
.probe = i82860_init_one,
.remove = i82860_remove_one,
.id_table = i82860_pci_tbl,
};
static int __init i82860_init(void)
{
int pci_rc;
edac_dbg(3, "\n");
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
if ((pci_rc = pci_register_driver(&i82860_driver)) < 0)
goto fail0;
if (!mci_pdev) {
mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_82860_0, NULL);
if (mci_pdev == NULL) {
edac_dbg(0, "860 pci_get_device fail\n");
pci_rc = -ENODEV;
goto fail1;
}
pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl);
if (pci_rc < 0) {
edac_dbg(0, "860 init fail\n");
pci_rc = -ENODEV;
goto fail1;
}
}
return 0;
fail1:
pci_unregister_driver(&i82860_driver);
fail0:
pci_dev_put(mci_pdev);
return pci_rc;
}
static void __exit i82860_exit(void)
{
edac_dbg(3, "\n");
pci_unregister_driver(&i82860_driver);
pci_dev_put(mci_pdev);
}
module_init(i82860_init);
module_exit(i82860_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) "
"Ben Woodard <woodard@redhat.com>");
MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers");
module_param(edac_op_state, int, 0444);
MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
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