drivers/edac/i82975x_edac.c

   1 /*
   2  * Intel 82975X Memory Controller kernel module
   3  * (C) 2007 aCarLab (India) Pvt. Ltd. (http://acarlab.com)
   4  * (C) 2007 jetzbroadband (http://jetzbroadband.com)
   5  * This file may be distributed under the terms of the
   6  * GNU General Public License.
   7  *
   8  * Written by Arvind R.
   9  *   Copied from i82875p_edac.c source:
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/pci.h>
  15 #include <linux/pci_ids.h>
  16 #include <linux/edac.h>
  17 #include "edac_core.h"
  18
  19 #define I82975X_REVISION        " Ver: 1.0.0"
  20 #define EDAC_MOD_STR            "i82975x_edac"
  21
  22 #define i82975x_printk(level, fmt, arg...) \
  23         edac_printk(level, "i82975x", fmt, ##arg)
  24
  25 #define i82975x_mc_printk(mci, level, fmt, arg...) \
  26         edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg)
  27
  28 #ifndef PCI_DEVICE_ID_INTEL_82975_0
  29 #define PCI_DEVICE_ID_INTEL_82975_0     0x277c
  30 #endif                          /* PCI_DEVICE_ID_INTEL_82975_0 */
  31
  32 #define I82975X_NR_DIMMS                8
  33 #define I82975X_NR_CSROWS(nr_chans)     (I82975X_NR_DIMMS / (nr_chans))
  34
  35 /* Intel 82975X register addresses - device 0 function 0 - DRAM Controller */
  36 #define I82975X_EAP             0x58    /* Dram Error Address Pointer (32b)
  37                                          *
  38                                          * 31:7  128 byte cache-line address
  39                                          * 6:1   reserved
  40                                          * 0     0: CH0; 1: CH1
  41                                          */
  42
  43 #define I82975X_DERRSYN         0x5c    /* Dram Error SYNdrome (8b)
  44                                          *
  45                                          *  7:0  DRAM ECC Syndrome
  46                                          */
  47
  48 #define I82975X_DES             0x5d    /* Dram ERRor DeSTination (8b)
  49                                          * 0h:    Processor Memory Reads
  50                                          * 1h:7h  reserved
  51                                          * More - See Page 65 of Intel DocSheet.
  52                                          */
  53
  54 #define I82975X_ERRSTS          0xc8    /* Error Status Register (16b)
  55                                          *
  56                                          * 15:12 reserved
  57                                          * 11    Thermal Sensor Event
  58                                          * 10    reserved
  59                                          *  9    non-DRAM lock error (ndlock)
  60                                          *  8    Refresh Timeout
  61                                          *  7:2  reserved
  62                                          *  1    ECC UE (multibit DRAM error)
  63                                          *  0    ECC CE (singlebit DRAM error)
  64                                          */
  65
  66 /* Error Reporting is supported by 3 mechanisms:
  67   1. DMI SERR generation  ( ERRCMD )
  68   2. SMI DMI  generation  ( SMICMD )
  69   3. SCI DMI  generation  ( SCICMD )
  70 NOTE: Only ONE of the three must be enabled
  71 */
  72 #define I82975X_ERRCMD          0xca    /* Error Command (16b)
  73                                          *
  74                                          * 15:12 reserved
  75                                          * 11    Thermal Sensor Event
  76                                          * 10    reserved
  77                                          *  9    non-DRAM lock error (ndlock)
  78                                          *  8    Refresh Timeout
  79                                          *  7:2  reserved
  80                                          *  1    ECC UE (multibit DRAM error)
  81                                          *  0    ECC CE (singlebit DRAM error)
  82                                          */
  83
  84 #define I82975X_SMICMD          0xcc    /* Error Command (16b)
  85                                          *
  86                                          * 15:2  reserved
  87                                          *  1    ECC UE (multibit DRAM error)
  88                                          *  0    ECC CE (singlebit DRAM error)
  89                                          */
  90
  91 #define I82975X_SCICMD          0xce    /* Error Command (16b)
  92                                          *
  93                                          * 15:2  reserved
  94                                          *  1    ECC UE (multibit DRAM error)
  95                                          *  0    ECC CE (singlebit DRAM error)
  96                                          */
  97
  98 #define I82975X_XEAP    0xfc    /* Extended Dram Error Address Pointer (8b)
  99                                          *
 100                                          * 7:1   reserved
 101                                          * 0     Bit32 of the Dram Error Address
 102                                          */
 103
 104 #define I82975X_MCHBAR          0x44    /*
 105                                          *
 106                                          * 31:14 Base Addr of 16K memory-mapped
 107                                          *      configuration space
 108                                          * 13:1  reserverd
 109                                          *  0    mem-mapped config space enable
 110                                          */
 111
 112 /* NOTE: Following addresses have to indexed using MCHBAR offset (44h, 32b) */
 113 /* Intel 82975x memory mapped register space */
 114
 115 #define I82975X_DRB_SHIFT 25    /* fixed 32MiB grain */
 116
 117 #define I82975X_DRB             0x100   /* DRAM Row Boundary (8b x 8)
 118                                          *
 119                                          * 7   set to 1 in highest DRB of
 120                                          *      channel if 4GB in ch.
 121                                          * 6:2 upper boundary of rank in
 122                                          *      32MB grains
 123                                          * 1:0 set to 0
 124                                          */
 125 #define I82975X_DRB_CH0R0               0x100
 126 #define I82975X_DRB_CH0R1               0x101
 127 #define I82975X_DRB_CH0R2               0x102
 128 #define I82975X_DRB_CH0R3               0x103
 129 #define I82975X_DRB_CH1R0               0x180
 130 #define I82975X_DRB_CH1R1               0x181
 131 #define I82975X_DRB_CH1R2               0x182
 132 #define I82975X_DRB_CH1R3               0x183
 133
 134
 135 #define I82975X_DRA             0x108   /* DRAM Row Attribute (4b x 8)
 136                                          *  defines the PAGE SIZE to be used
 137                                          *      for the rank
 138                                          *  7    reserved
 139                                          *  6:4  row attr of odd rank, i.e. 1
 140                                          *  3    reserved
 141                                          *  2:0  row attr of even rank, i.e. 0
 142                                          *
 143                                          * 000 = unpopulated
 144                                          * 001 = reserved
 145                                          * 010 = 4KiB
 146                                          * 011 = 8KiB
 147                                          * 100 = 16KiB
 148                                          * others = reserved
 149                                          */
 150 #define I82975X_DRA_CH0R01              0x108
 151 #define I82975X_DRA_CH0R23              0x109
 152 #define I82975X_DRA_CH1R01              0x188
 153 #define I82975X_DRA_CH1R23              0x189
 154
 155
 156 #define I82975X_BNKARC  0x10e /* Type of device in each rank - Bank Arch (16b)
 157                                          *
 158                                          * 15:8  reserved
 159                                          * 7:6  Rank 3 architecture
 160                                          * 5:4  Rank 2 architecture
 161                                          * 3:2  Rank 1 architecture
 162                                          * 1:0  Rank 0 architecture
 163                                          *
 164                                          * 00 => 4 banks
 165                                          * 01 => 8 banks
 166                                          */
 167 #define I82975X_C0BNKARC        0x10e
 168 #define I82975X_C1BNKARC        0x18e
 169
 170
 171
 172 #define I82975X_DRC             0x120 /* DRAM Controller Mode0 (32b)
 173                                          *
 174                                          * 31:30 reserved
 175                                          * 29    init complete
 176                                          * 28:11 reserved, according to Intel
 177                                          *    22:21 number of channels
 178                                          *              00=1 01=2 in 82875
 179                                          *              seems to be ECC mode
 180                                          *              bits in 82975 in Asus
 181                                          *              P5W
 182                                          *       19:18 Data Integ Mode
 183                                          *              00=none 01=ECC in 82875
 184                                          * 10:8  refresh mode
 185                                          *  7    reserved
 186                                          *  6:4  mode select
 187                                          *  3:2  reserved
 188                                          *  1:0  DRAM type 10=Second Revision
 189                                          *              DDR2 SDRAM
 190                                          *         00, 01, 11 reserved
 191                                          */
 192 #define I82975X_DRC_CH0M0               0x120
 193 #define I82975X_DRC_CH1M0               0x1A0
 194
 195
 196 #define I82975X_DRC_M1  0x124 /* DRAM Controller Mode1 (32b)
 197                                          * 31   0=Standard Address Map
 198                                          *      1=Enhanced Address Map
 199                                          * 30:0 reserved
 200                                          */
 201
 202 #define I82975X_DRC_CH0M1               0x124
 203 #define I82975X_DRC_CH1M1               0x1A4
 204
 205 enum i82975x_chips {
 206         I82975X = 0,
 207 };
 208
 209 struct i82975x_pvt {
 210         void __iomem *mch_window;
 211 };
 212
 213 struct i82975x_dev_info {
 214         const char *ctl_name;
 215 };
 216
 217 struct i82975x_error_info {
 218         u16 errsts;
 219         u32 eap;
 220         u8 des;
 221         u8 derrsyn;
 222         u16 errsts2;
 223         u8 chan;                /* the channel is bit 0 of EAP */
 224         u8 xeap;                /* extended eap bit */
 225 };
 226
 227 static const struct i82975x_dev_info i82975x_devs[] = {
 228         [I82975X] = {
 229                 .ctl_name = "i82975x"
 230         },
 231 };
 232
 233 static struct pci_dev *mci_pdev;        /* init dev: in case that AGP code has
 234                                          * already registered driver
 235                                          */
 236
 237 static int i82975x_registered = 1;
 238
 239 static void i82975x_get_error_info(struct mem_ctl_info *mci,
 240                 struct i82975x_error_info *info)
 241 {
 242         struct pci_dev *pdev;
 243
 244         pdev = to_pci_dev(mci->pdev);
 245
 246         /*
 247          * This is a mess because there is no atomic way to read all the
 248          * registers at once and the registers can transition from CE being
 249          * overwritten by UE.
 250          */
 251         pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts);
 252         pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
 253         pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
 254         pci_read_config_byte(pdev, I82975X_DES, &info->des);
 255         pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn);
 256         pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2);
 257
 258         pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003);
 259
 260         /*
 261          * If the error is the same then we can for both reads then
 262          * the first set of reads is valid.  If there is a change then
 263          * there is a CE no info and the second set of reads is valid
 264          * and should be UE info.
 265          */
 266         if (!(info->errsts2 & 0x0003))
 267                 return;
 268
 269         if ((info->errsts ^ info->errsts2) & 0x0003) {
 270                 pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
 271                 pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
 272                 pci_read_config_byte(pdev, I82975X_DES, &info->des);
 273                 pci_read_config_byte(pdev, I82975X_DERRSYN,
 274                                 &info->derrsyn);
 275         }
 276 }
 277
 278 static int i82975x_process_error_info(struct mem_ctl_info *mci,
 279                 struct i82975x_error_info *info, int handle_errors)
 280 {
 281         int row, chan;
 282         unsigned long offst, page;
 283
 284         if (!(info->errsts2 & 0x0003))
 285                 return 0;
 286
 287         if (!handle_errors)
 288                 return 1;
 289
 290         if ((info->errsts ^ info->errsts2) & 0x0003) {
 291                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
 292                                      -1, -1, -1, "UE overwrote CE", "");
 293                 info->errsts = info->errsts2;
 294         }
 295
 296         page = (unsigned long) info->eap;
 297         page >>= 1;
 298         if (info->xeap & 1)
 299                 page |= 0x80000000;
 300         page >>= (PAGE_SHIFT - 1);
 301         row = edac_mc_find_csrow_by_page(mci, page);
 302
 303         if (row == -1)  {
 304                 i82975x_mc_printk(mci, KERN_ERR, "error processing EAP:\n"
 305                         "\tXEAP=%u\n"
 306                         "\t EAP=0x%08x\n"
 307                         "\tPAGE=0x%08x\n",
 308                         (info->xeap & 1) ? 1 : 0, info->eap, (unsigned int) page);
 309                 return 0;
 310         }
 311         chan = (mci->csrows[row]->nr_channels == 1) ? 0 : info->eap & 1;
 312         offst = info->eap
 313                         & ((1 << PAGE_SHIFT) -
 314                            (1 << mci->csrows[row]->channels[chan]->dimm->grain));
 315
 316         if (info->errsts & 0x0002)
 317                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 318                                      page, offst, 0,
 319                                      row, -1, -1,
 320                                      "i82975x UE", "");
 321         else
 322                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 323                                      page, offst, info->derrsyn,
 324                                      row, chan ? chan : 0, -1,
 325                                      "i82975x CE", "");
 326
 327         return 1;
 328 }
 329
 330 static void i82975x_check(struct mem_ctl_info *mci)
 331 {
 332         struct i82975x_error_info info;
 333
 334         edac_dbg(1, "MC%d\n", mci->mc_idx);
 335         i82975x_get_error_info(mci, &info);
 336         i82975x_process_error_info(mci, &info, 1);
 337 }
 338
 339 /* Return 1 if dual channel mode is active.  Else return 0. */
 340 static int dual_channel_active(void __iomem *mch_window)
 341 {
 342         /*
 343          * We treat interleaved-symmetric configuration as dual-channel - EAP's
 344          * bit-0 giving the channel of the error location.
 345          *
 346          * All other configurations are treated as single channel - the EAP's
 347          * bit-0 will resolve ok in symmetric area of mixed
 348          * (symmetric/asymmetric) configurations
 349          */
 350         u8      drb[4][2];
 351         int     row;
 352         int    dualch;
 353
 354         for (dualch = 1, row = 0; dualch && (row < 4); row++) {
 355                 drb[row][0] = readb(mch_window + I82975X_DRB + row);
 356                 drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
 357                 dualch = dualch && (drb[row][0] == drb[row][1]);
 358         }
 359         return dualch;
 360 }
 361
 362 static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
 363 {
 364         /*
 365          * ECC is possible on i92975x ONLY with DEV_X8
 366          */
 367         return DEV_X8;
 368 }
 369
 370 static void i82975x_init_csrows(struct mem_ctl_info *mci,
 371                 struct pci_dev *pdev, void __iomem *mch_window)
 372 {
 373         struct csrow_info *csrow;
 374         unsigned long last_cumul_size;
 375         u8 value;
 376         u32 cumul_size, nr_pages;
 377         int index, chan;
 378         struct dimm_info *dimm;
 379         enum dev_type dtype;
 380
 381         last_cumul_size = 0;
 382
 383         /*
 384          * 82875 comment:
 385          * The dram row boundary (DRB) reg values are boundary address
 386          * for each DRAM row with a granularity of 32 or 64MB (single/dual
 387          * channel operation).  DRB regs are cumulative; therefore DRB7 will
 388          * contain the total memory contained in all rows.
 389          *
 390          */
 391
 392         for (index = 0; index < mci->nr_csrows; index++) {
 393                 csrow = mci->csrows[index];
 394
 395                 value = readb(mch_window + I82975X_DRB + index +
 396                                         ((index >= 4) ? 0x80 : 0));
 397                 cumul_size = value;
 398                 cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
 399                 /*
 400                  * Adjust cumul_size w.r.t number of channels
 401                  *
 402                  */
 403                 if (csrow->nr_channels > 1)
 404                         cumul_size <<= 1;
 405                 edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
 406
 407                 nr_pages = cumul_size - last_cumul_size;
 408                 if (!nr_pages)
 409                         continue;
 410
 411                 /*
 412                  * Initialise dram labels
 413                  * index values:
 414                  *   [0-7] for single-channel; i.e. csrow->nr_channels = 1
 415                  *   [0-3] for dual-channel; i.e. csrow->nr_channels = 2
 416                  */
 417                 dtype = i82975x_dram_type(mch_window, index);
 418                 for (chan = 0; chan < csrow->nr_channels; chan++) {
 419                         dimm = mci->csrows[index]->channels[chan]->dimm;
 420
 421                         dimm->nr_pages = nr_pages / csrow->nr_channels;
 422
 423                         snprintf(csrow->channels[chan]->dimm->label, EDAC_MC_LABEL_LEN, "DIMM %c%d",
 424                                  (chan == 0) ? 'A' : 'B',
 425                                  index);
 426                         dimm->grain = 1 << 7;   /* 128Byte cache-line resolution */
 427                         dimm->dtype = i82975x_dram_type(mch_window, index);
 428                         dimm->mtype = MEM_DDR2; /* I82975x supports only DDR2 */
 429                         dimm->edac_mode = EDAC_SECDED; /* only supported */
 430                 }
 431
 432                 csrow->first_page = last_cumul_size;
 433                 csrow->last_page = cumul_size - 1;
 434                 last_cumul_size = cumul_size;
 435         }
 436 }
 437
 438 /* #define  i82975x_DEBUG_IOMEM */
 439
 440 #ifdef i82975x_DEBUG_IOMEM
 441 static void i82975x_print_dram_timings(void __iomem *mch_window)
 442 {
 443         /*
 444          * The register meanings are from Intel specs;
 445          * (shows 13-5-5-5 for 800-DDR2)
 446          * Asus P5W Bios reports 15-5-4-4
 447          * What's your religion?
 448          */
 449         static const int caslats[4] = { 5, 4, 3, 6 };
 450         u32     dtreg[2];
 451
 452         dtreg[0] = readl(mch_window + 0x114);
 453         dtreg[1] = readl(mch_window + 0x194);
 454         i82975x_printk(KERN_INFO, "DRAM Timings :     Ch0    Ch1\n"
 455                 "                RAS Active Min = %d     %d\n"
 456                 "                CAS latency    =  %d      %d\n"
 457                 "                RAS to CAS     =  %d      %d\n"
 458                 "                RAS precharge  =  %d      %d\n",
 459                 (dtreg[0] >> 19 ) & 0x0f,
 460                         (dtreg[1] >> 19) & 0x0f,
 461                 caslats[(dtreg[0] >> 8) & 0x03],
 462                         caslats[(dtreg[1] >> 8) & 0x03],
 463                 ((dtreg[0] >> 4) & 0x07) + 2,
 464                         ((dtreg[1] >> 4) & 0x07) + 2,
 465                 (dtreg[0] & 0x07) + 2,
 466                         (dtreg[1] & 0x07) + 2
 467         );
 468
 469 }
 470 #endif
 471
 472 static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
 473 {
 474         int rc = -ENODEV;
 475         struct mem_ctl_info *mci;
 476         struct edac_mc_layer layers[2];
 477         struct i82975x_pvt *pvt;
 478         void __iomem *mch_window;
 479         u32 mchbar;
 480         u32 drc[2];
 481         struct i82975x_error_info discard;
 482         int     chans;
 483 #ifdef i82975x_DEBUG_IOMEM
 484         u8 c0drb[4];
 485         u8 c1drb[4];
 486 #endif
 487
 488         edac_dbg(0, "\n");
 489
 490         pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
 491         if (!(mchbar & 1)) {
 492                 edac_dbg(3, "failed, MCHBAR disabled!\n");
 493                 goto fail0;
 494         }
 495         mchbar &= 0xffffc000;   /* bits 31:14 used for 16K window */
 496         mch_window = ioremap_nocache(mchbar, 0x1000);
 497
 498 #ifdef i82975x_DEBUG_IOMEM
 499         i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
 500                                         mchbar, mch_window);
 501
 502         c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
 503         c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
 504         c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
 505         c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
 506         c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
 507         c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
 508         c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
 509         c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
 510         i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
 511         i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
 512         i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
 513         i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
 514         i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
 515         i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
 516         i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
 517         i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
 518 #endif
 519
 520         drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
 521         drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
 522 #ifdef i82975x_DEBUG_IOMEM
 523         i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
 524                         ((drc[0] >> 21) & 3) == 1 ?
 525                                 "ECC enabled" : "ECC disabled");
 526         i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
 527                         ((drc[1] >> 21) & 3) == 1 ?
 528                                 "ECC enabled" : "ECC disabled");
 529
 530         i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
 531                 readw(mch_window + I82975X_C0BNKARC));
 532         i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
 533                 readw(mch_window + I82975X_C1BNKARC));
 534         i82975x_print_dram_timings(mch_window);
 535         goto fail1;
 536 #endif
 537         if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) {
 538                 i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
 539                 goto fail1;
 540         }
 541
 542         chans = dual_channel_active(mch_window) + 1;
 543
 544         /* assuming only one controller, index thus is 0 */
 545         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 546         layers[0].size = I82975X_NR_DIMMS;
 547         layers[0].is_virt_csrow = true;
 548         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 549         layers[1].size = I82975X_NR_CSROWS(chans);
 550         layers[1].is_virt_csrow = false;
 551         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
 552         if (!mci) {
 553                 rc = -ENOMEM;
 554                 goto fail1;
 555         }
 556
 557         edac_dbg(3, "init mci\n");
 558         mci->pdev = &pdev->dev;
 559         mci->mtype_cap = MEM_FLAG_DDR2;
 560         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 561         mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 562         mci->mod_name = EDAC_MOD_STR;
 563         mci->mod_ver = I82975X_REVISION;
 564         mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
 565         mci->dev_name = pci_name(pdev);
 566         mci->edac_check = i82975x_check;
 567         mci->ctl_page_to_phys = NULL;
 568         edac_dbg(3, "init pvt\n");
 569         pvt = (struct i82975x_pvt *) mci->pvt_info;
 570         pvt->mch_window = mch_window;
 571         i82975x_init_csrows(mci, pdev, mch_window);
 572         mci->scrub_mode = SCRUB_HW_SRC;
 573         i82975x_get_error_info(mci, &discard);  /* clear counters */
 574
 575         /* finalize this instance of memory controller with edac core */
 576         if (edac_mc_add_mc(mci)) {
 577                 edac_dbg(3, "failed edac_mc_add_mc()\n");
 578                 goto fail2;
 579         }
 580
 581         /* get this far and it's successful */
 582         edac_dbg(3, "success\n");
 583         return 0;
 584
 585 fail2:
 586         edac_mc_free(mci);
 587
 588 fail1:
 589         iounmap(mch_window);
 590 fail0:
 591         return rc;
 592 }
 593
 594 /* returns count (>= 0), or negative on error */
 595 static int i82975x_init_one(struct pci_dev *pdev,
 596                             const struct pci_device_id *ent)
 597 {
 598         int rc;
 599
 600         edac_dbg(0, "\n");
 601
 602         if (pci_enable_device(pdev) < 0)
 603                 return -EIO;
 604
 605         rc = i82975x_probe1(pdev, ent->driver_data);
 606
 607         if (mci_pdev == NULL)
 608                 mci_pdev = pci_dev_get(pdev);
 609
 610         return rc;
 611 }
 612
 613 static void i82975x_remove_one(struct pci_dev *pdev)
 614 {
 615         struct mem_ctl_info *mci;
 616         struct i82975x_pvt *pvt;
 617
 618         edac_dbg(0, "\n");
 619
 620         mci = edac_mc_del_mc(&pdev->dev);
 621         if (mci  == NULL)
 622                 return;
 623
 624         pvt = mci->pvt_info;
 625         if (pvt->mch_window)
 626                 iounmap( pvt->mch_window );
 627
 628         edac_mc_free(mci);
 629 }
 630
 631 static DEFINE_PCI_DEVICE_TABLE(i82975x_pci_tbl) = {
 632         {
 633                 PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 634                 I82975X
 635         },
 636         {
 637                 0,
 638         }       /* 0 terminated list. */
 639 };
 640
 641 MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);
 642
 643 static struct pci_driver i82975x_driver = {
 644         .name = EDAC_MOD_STR,
 645         .probe = i82975x_init_one,
 646         .remove = i82975x_remove_one,
 647         .id_table = i82975x_pci_tbl,
 648 };
 649
 650 static int __init i82975x_init(void)
 651 {
 652         int pci_rc;
 653
 654         edac_dbg(3, "\n");
 655
 656        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 657        opstate_init();
 658
 659         pci_rc = pci_register_driver(&i82975x_driver);
 660         if (pci_rc < 0)
 661                 goto fail0;
 662
 663         if (mci_pdev == NULL) {
 664                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 665                                 PCI_DEVICE_ID_INTEL_82975_0, NULL);
 666
 667                 if (!mci_pdev) {
 668                         edac_dbg(0, "i82975x pci_get_device fail\n");
 669                         pci_rc = -ENODEV;
 670                         goto fail1;
 671                 }
 672
 673                 pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);
 674
 675                 if (pci_rc < 0) {
 676                         edac_dbg(0, "i82975x init fail\n");
 677                         pci_rc = -ENODEV;
 678                         goto fail1;
 679                 }
 680         }
 681
 682         return 0;
 683
 684 fail1:
 685         pci_unregister_driver(&i82975x_driver);
 686
 687 fail0:
 688         if (mci_pdev != NULL)
 689                 pci_dev_put(mci_pdev);
 690
 691         return pci_rc;
 692 }
 693
 694 static void __exit i82975x_exit(void)
 695 {
 696         edac_dbg(3, "\n");
 697
 698         pci_unregister_driver(&i82975x_driver);
 699
 700         if (!i82975x_registered) {
 701                 i82975x_remove_one(mci_pdev);
 702                 pci_dev_put(mci_pdev);
 703         }
 704 }
 705
 706 module_init(i82975x_init);
 707 module_exit(i82975x_exit);
 708
 709 MODULE_LICENSE("GPL");
 710 MODULE_AUTHOR("Arvind R. <arvino55@gmail.com>");
 711 MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");
 712
 713 module_param(edac_op_state, int, 0444);
 714 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");