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