/*
* Intel 3000 / 3010 Memory Controller kernel module
* Copyright ( C ) 2007 Akamai Technologies , Inc .
* Shamelessly copied from :
* Intel D82875P 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 .
*/
#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 "i3000_edac"
#define I3000_RANKS 8
#define I3000_RANKS_PER_CHANNEL 4
#define I3000_CHANNELS 2
/* Intel 3000 register addresses - device 0 function 0 - DRAM Controller */
#define I3000_MCHBAR 0 x44 /* MCH Memory Mapped Register BAR */
#define I3000_MCHBAR_MASK 0 xffffc000
#define I3000_MMR_WINDOW_SIZE 16384
#define I3000_EDEAP 0 x70 /* Extended DRAM Error Address Pointer (8b)
*
* 7 : 1 reserved
* 0 bit 32 of address
*/
#define I3000_DEAP 0 x58 /* DRAM Error Address Pointer (32b)
*
* 31 : 7 address
* 6 : 1 reserved
* 0 Error channel 0 / 1
*/
#define I3000_DEAP_GRAIN (1 << 7 )
/*
* Helper functions to decode the DEAP / EDEAP hardware registers .
*
* The type promotion here is deliberate ; we ' re deriving an
* unsigned long pfn and offset from hardware regs which are u8 / u32 .
*/
static inline unsigned long deap_pfn(u8 edeap, u32 deap)
{
deap >>= PAGE_SHIFT;
deap |= (edeap & 1 ) << (32 - PAGE_SHIFT);
return deap;
}
static inline unsigned long deap_offset(u32 deap)
{
return deap & ~(I3000_DEAP_GRAIN - 1 ) & ~PAGE_MASK;
}
static inline int deap_channel(u32 deap)
{
return deap & 1 ;
}
#define I3000_DERRSYN 0 x5c /* DRAM Error Syndrome (8b)
*
* 7 : 0 DRAM ECC Syndrome
*/
#define I3000_ERRSTS 0 xc8 /* Error Status Register (16b)
*
* 15 : 12 reserved
* 11 MCH Thermal Sensor Event
* for SMI / SCI / SERR
* 10 reserved
* 9 LOCK to non - DRAM Memory Flag ( LCKF )
* 8 Received Refresh Timeout Flag ( RRTOF )
* 7 : 2 reserved
* 1 Multi - bit DRAM ECC Error Flag ( DMERR )
* 0 Single - bit DRAM ECC Error Flag ( DSERR )
*/
#define I3000_ERRSTS_BITS 0 x0b03 /* bits which indicate errors */
#define I3000_ERRSTS_UE 0 x0002
#define I3000_ERRSTS_CE 0 x0001
#define I3000_ERRCMD 0 xca /* Error Command (16b)
*
* 15 : 12 reserved
* 11 SERR on MCH Thermal Sensor Event
* ( TSESERR )
* 10 reserved
* 9 SERR on LOCK to non - DRAM Memory
* ( LCKERR )
* 8 SERR on DRAM Refresh Timeout
* ( DRTOERR )
* 7 : 2 reserved
* 1 SERR Multi - Bit DRAM ECC Error
* ( DMERR )
* 0 SERR on Single - Bit ECC Error
* ( DSERR )
*/
/* Intel MMIO register space - device 0 function 0 - MMR space */
#define I3000_DRB_SHIFT 25 /* 32MiB grain */
#define I3000_C0DRB 0 x100 /* Channel 0 DRAM Rank Boundary (8b x 4)
*
* 7 : 0 Channel 0 DRAM Rank Boundary Address
*/
#define I3000_C1DRB 0 x180 /* Channel 1 DRAM Rank Boundary (8b x 4)
*
* 7 : 0 Channel 1 DRAM Rank Boundary Address
*/
#define I3000_C0DRA 0 x108 /* Channel 0 DRAM Rank Attribute (8b x 2)
*
* 7 reserved
* 6 : 4 DRAM odd Rank Attribute
* 3 reserved
* 2 : 0 DRAM even Rank Attribute
*
* Each attribute defines the page
* size of the corresponding rank :
* 000 : unpopulated
* 001 : reserved
* 010 : 4 KB
* 011 : 8 KB
* 100 : 16 KB
* Others : reserved
*/
#define I3000_C1DRA 0 x188 /* Channel 1 DRAM Rank Attribute (8b x 2) */
static inline unsigned char odd_rank_attrib(unsigned char dra)
{
return (dra & 0 x70) >> 4 ;
}
static inline unsigned char even_rank_attrib(unsigned char dra)
{
return dra & 0 x07;
}
#define I3000_C0DRC0 0 x120 /* DRAM Controller Mode 0 (32b)
*
* 31 : 30 reserved
* 29 Initialization Complete ( IC )
* 28 : 11 reserved
* 10 : 8 Refresh Mode Select ( RMS )
* 7 reserved
* 6 : 4 Mode Select ( SMS )
* 3 : 2 reserved
* 1 : 0 DRAM Type ( DT )
*/
#define I3000_C0DRC1 0 x124 /* DRAM Controller Mode 1 (32b)
*
* 31 Enhanced Addressing Enable ( ENHADE )
* 30 : 0 reserved
*/
enum i3000p_chips {
I3000 = 0 ,
};
struct i3000_dev_info {
const char *ctl_name;
};
struct i3000_error_info {
u16 errsts;
u8 derrsyn;
u8 edeap;
u32 deap;
u16 errsts2;
};
static const struct i3000_dev_info i3000_devs[] = {
[I3000] = {
.ctl_name = "i3000" },
};
static struct pci_dev *mci_pdev;
static int i3000_registered = 1 ;
static struct edac_pci_ctl_info *i3000_pci;
static void i3000_get_error_info(struct mem_ctl_info *mci,
struct i3000_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, I3000_ERRSTS, &info->errsts);
if (!(info->errsts & I3000_ERRSTS_BITS))
return ;
pci_read_config_byte(pdev, I3000_EDEAP, &info->edeap);
pci_read_config_dword(pdev, I3000_DEAP, &info->deap);
pci_read_config_byte(pdev, I3000_DERRSYN, &info->derrsyn);
pci_read_config_word(pdev, I3000_ERRSTS, &info->errsts2);
/*
* 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
* with no info and the second set of reads is valid and
* should be UE info .
*/
if ((info->errsts ^ info->errsts2) & I3000_ERRSTS_BITS) {
pci_read_config_byte(pdev, I3000_EDEAP, &info->edeap);
pci_read_config_dword(pdev, I3000_DEAP, &info->deap);
pci_read_config_byte(pdev, I3000_DERRSYN, &info->derrsyn);
}
/*
* Clear any error bits .
* ( Yes , we really clear bits by writing 1 to them . )
*/
pci_write_bits16(pdev, I3000_ERRSTS, I3000_ERRSTS_BITS,
I3000_ERRSTS_BITS);
}
static int i3000_process_error_info(struct mem_ctl_info *mci,
struct i3000_error_info *info,
int handle_errors)
{
int row, multi_chan, channel;
unsigned long pfn, offset;
multi_chan = mci->csrows[0 ]->nr_channels - 1 ;
if (!(info->errsts & I3000_ERRSTS_BITS))
return 0 ;
if (!handle_errors)
return 1 ;
if ((info->errsts ^ info->errsts2) & I3000_ERRSTS_BITS) {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1 , 0 , 0 , 0 ,
-1 , -1 , -1 ,
"UE overwrote CE" , "" );
info->errsts = info->errsts2;
}
pfn = deap_pfn(info->edeap, info->deap);
offset = deap_offset(info->deap);
channel = deap_channel(info->deap);
row = edac_mc_find_csrow_by_page(mci, pfn);
if (info->errsts & I3000_ERRSTS_UE)
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1 ,
pfn, offset, 0 ,
row, -1 , -1 ,
"i3000 UE" , "" );
else
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1 ,
pfn, offset, info->derrsyn,
row, multi_chan ? channel : 0 , -1 ,
"i3000 CE" , "" );
return 1 ;
}
static void i3000_check(struct mem_ctl_info *mci)
{
struct i3000_error_info info;
i3000_get_error_info(mci, &info);
i3000_process_error_info(mci, &info, 1 );
}
static int i3000_is_interleaved(const unsigned char *c0dra,
const unsigned char *c1dra,
const unsigned char *c0drb,
const unsigned char *c1drb)
{
int i;
/*
* If the channels aren ' t populated identically then
* we ' re not interleaved .
*/
for (i = 0 ; i < I3000_RANKS_PER_CHANNEL / 2 ; i++)
if (odd_rank_attrib(c0dra[i]) != odd_rank_attrib(c1dra[i]) ||
even_rank_attrib(c0dra[i]) !=
even_rank_attrib(c1dra[i]))
return 0 ;
/*
* If the rank boundaries for the two channels are different
* then we ' re not interleaved .
*/
for (i = 0 ; i < I3000_RANKS_PER_CHANNEL; i++)
if (c0drb[i] != c1drb[i])
return 0 ;
return 1 ;
}
static int i3000_probe1(struct pci_dev *pdev, int dev_idx)
{
int rc;
int i, j;
struct mem_ctl_info *mci = NULL;
struct edac_mc_layer layers[2 ];
unsigned long last_cumul_size, nr_pages;
int interleaved, nr_channels;
unsigned char dra[I3000_RANKS / 2 ], drb[I3000_RANKS];
unsigned char *c0dra = dra, *c1dra = &dra[I3000_RANKS_PER_CHANNEL / 2 ];
unsigned char *c0drb = drb, *c1drb = &drb[I3000_RANKS_PER_CHANNEL];
unsigned long mchbar;
void __iomem *window;
edac_dbg(0 , "MC:\n" );
pci_read_config_dword(pdev, I3000_MCHBAR, (u32 *) & mchbar);
mchbar &= I3000_MCHBAR_MASK;
window = ioremap(mchbar, I3000_MMR_WINDOW_SIZE);
if (!window) {
printk(KERN_ERR "i3000: cannot map mmio space at 0x%lx\n" ,
mchbar);
return -ENODEV;
}
c0dra[0 ] = readb(window + I3000_C0DRA + 0 ); /* ranks 0,1 */
c0dra[1 ] = readb(window + I3000_C0DRA + 1 ); /* ranks 2,3 */
c1dra[0 ] = readb(window + I3000_C1DRA + 0 ); /* ranks 0,1 */
c1dra[1 ] = readb(window + I3000_C1DRA + 1 ); /* ranks 2,3 */
for (i = 0 ; i < I3000_RANKS_PER_CHANNEL; i++) {
c0drb[i] = readb(window + I3000_C0DRB + i);
c1drb[i] = readb(window + I3000_C1DRB + i);
}
iounmap(window);
/*
* Figure out how many channels we have .
*
* If we have what the datasheet calls " asymmetric channels "
* ( essentially the same as what was called " virtual single
* channel mode " in the i82875 ) then it ' s a single channel as
* far as EDAC is concerned .
*/
interleaved = i3000_is_interleaved(c0dra, c1dra, c0drb, c1drb);
nr_channels = interleaved ? 2 : 1 ;
layers[0 ].type = EDAC_MC_LAYER_CHIP_SELECT;
layers[0 ].size = I3000_RANKS / nr_channels;
layers[0 ].is_virt_csrow = true ;
layers[1 ].type = EDAC_MC_LAYER_CHANNEL;
layers[1 ].size = nr_channels;
layers[1 ].is_virt_csrow = false ;
mci = edac_mc_alloc(0 , ARRAY_SIZE(layers), layers, 0 );
if (!mci)
return -ENOMEM;
edac_dbg(3 , "MC: init mci\n" );
mci->pdev = &pdev->dev;
mci->mtype_cap = MEM_FLAG_DDR2;
mci->edac_ctl_cap = EDAC_FLAG_SECDED;
mci->edac_cap = EDAC_FLAG_SECDED;
mci->mod_name = EDAC_MOD_STR;
mci->ctl_name = i3000_devs[dev_idx].ctl_name;
mci->dev_name = pci_name(pdev);
mci->edac_check = i3000_check;
mci->ctl_page_to_phys = NULL;
/*
* The dram rank boundary ( DRB ) reg values are boundary addresses
* for each DRAM rank with a granularity of 32 MB . DRB regs are
* cumulative ; the last one will contain the total memory
* contained in all ranks .
*
* If we ' re in interleaved mode then we ' re only walking through
* the ranks of controller 0 , so we double all the values we see .
*/
for (last_cumul_size = i = 0 ; i < mci->nr_csrows; i++) {
u8 value;
u32 cumul_size;
struct csrow_info *csrow = mci->csrows[i];
value = drb[i];
cumul_size = value << (I3000_DRB_SHIFT - PAGE_SHIFT);
if (interleaved)
cumul_size <<= 1 ;
edac_dbg(3 , "MC: (%d) cumul_size 0x%x\n" , i, cumul_size);
if (cumul_size == last_cumul_size)
continue ;
csrow->first_page = last_cumul_size;
csrow->last_page = cumul_size - 1 ;
nr_pages = cumul_size - last_cumul_size;
last_cumul_size = cumul_size;
for (j = 0 ; j < nr_channels; j++) {
struct dimm_info *dimm = csrow->channels[j]->dimm;
dimm->nr_pages = nr_pages / nr_channels;
dimm->grain = I3000_DEAP_GRAIN;
dimm->mtype = MEM_DDR2;
dimm->dtype = DEV_UNKNOWN;
dimm->edac_mode = EDAC_UNKNOWN;
}
}
/*
* Clear any error bits .
* ( Yes , we really clear bits by writing 1 to them . )
*/
pci_write_bits16(pdev, I3000_ERRSTS, I3000_ERRSTS_BITS,
I3000_ERRSTS_BITS);
rc = -ENODEV;
if (edac_mc_add_mc(mci)) {
edac_dbg(3 , "MC: failed edac_mc_add_mc()\n" );
goto fail;
}
/* allocating generic PCI control info */
i3000_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
if (!i3000_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 , "MC: success\n" );
return 0 ;
fail:
if (mci)
edac_mc_free(mci);
return rc;
}
/* returns count (>= 0), or negative on error */
static int i3000_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int rc;
edac_dbg(0 , "MC:\n" );
if (pci_enable_device(pdev) < 0 )
return -EIO;
rc = i3000_probe1(pdev, ent->driver_data);
if (!mci_pdev)
mci_pdev = pci_dev_get(pdev);
return rc;
}
static void i3000_remove_one(struct pci_dev *pdev)
{
struct mem_ctl_info *mci;
edac_dbg(0 , "\n" );
if (i3000_pci)
edac_pci_release_generic_ctl(i3000_pci);
mci = edac_mc_del_mc(&pdev->dev);
if (!mci)
return ;
edac_mc_free(mci);
}
static const struct pci_device_id i3000_pci_tbl[] = {
{
PCI_VEND_DEV(INTEL, 3000 _HB), PCI_ANY_ID, PCI_ANY_ID, 0 , 0 ,
I3000},
{
0 ,
} /* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, i3000_pci_tbl);
static struct pci_driver i3000_driver = {
.name = EDAC_MOD_STR,
.probe = i3000_init_one,
.remove = i3000_remove_one,
.id_table = i3000_pci_tbl,
};
static int __init i3000_init(void )
{
int pci_rc;
edac_dbg(3 , "MC:\n" );
/* Ensure that the OPSTATE is set correctly for POLL or NMI */
opstate_init();
pci_rc = pci_register_driver(&i3000_driver);
if (pci_rc < 0 )
goto fail0;
if (!mci_pdev) {
i3000_registered = 0 ;
mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
PCI_DEVICE_ID_INTEL_3000_HB, NULL);
if (!mci_pdev) {
edac_dbg(0 , "i3000 pci_get_device fail\n" );
pci_rc = -ENODEV;
goto fail1;
}
pci_rc = i3000_init_one(mci_pdev, i3000_pci_tbl);
if (pci_rc < 0 ) {
edac_dbg(0 , "i3000 init fail\n" );
pci_rc = -ENODEV;
goto fail1;
}
}
return 0 ;
fail1:
pci_unregister_driver(&i3000_driver);
fail0:
pci_dev_put(mci_pdev);
return pci_rc;
}
static void __exit i3000_exit(void )
{
edac_dbg(3 , "MC:\n" );
pci_unregister_driver(&i3000_driver);
if (!i3000_registered) {
i3000_remove_one(mci_pdev);
pci_dev_put(mci_pdev);
}
}
module_init(i3000_init);
module_exit(i3000_exit);
MODULE_LICENSE("GPL" );
MODULE_AUTHOR("Akamai Technologies Arthur Ulfeldt/Jason Uhlenkott" );
MODULE_DESCRIPTION("MC support for Intel 3000 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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