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_CSROWS(nr_chans)             (8/(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  reserverd
 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->dev);
 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, multi_chan, chan;
 281         unsigned long offst, page;
 282
 283         multi_chan = mci->csrows[0].nr_channels - 1;
 284
 285         if (!(info->errsts2 & 0x0003))
 286                 return 0;
 287
 288         if (!handle_errors)
 289                 return 1;
 290
 291         if ((info->errsts ^ info->errsts2) & 0x0003) {
 292                 edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
 293                 info->errsts = info->errsts2;
 294         }
 295
 296         page = (unsigned long) info->eap;
 297         if (info->xeap & 1)
 298                 page |= 0x100000000ul;
 299         chan = page & 1;
 300         page >>= 1;
 301         offst = page & ((1 << PAGE_SHIFT) - 1);
 302         page >>= PAGE_SHIFT;
 303         row = edac_mc_find_csrow_by_page(mci, page);
 304
 305         if (info->errsts & 0x0002)
 306                 edac_mc_handle_ue(mci, page, offst , row, "i82975x UE");
 307         else
 308                 edac_mc_handle_ce(mci, page, offst, info->derrsyn, row,
 309                                 multi_chan ? chan : 0,
 310                                 "i82975x CE");
 311
 312         return 1;
 313 }
 314
 315 static void i82975x_check(struct mem_ctl_info *mci)
 316 {
 317         struct i82975x_error_info info;
 318
 319         debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
 320         i82975x_get_error_info(mci, &info);
 321         i82975x_process_error_info(mci, &info, 1);
 322 }
 323
 324 /* Return 1 if dual channel mode is active.  Else return 0. */
 325 static int dual_channel_active(void __iomem *mch_window)
 326 {
 327         /*
 328          * We treat interleaved-symmetric configuration as dual-channel - EAP's
 329          * bit-0 giving the channel of the error location.
 330          *
 331          * All other configurations are treated as single channel - the EAP's
 332          * bit-0 will resolve ok in symmetric area of mixed
 333          * (symmetric/asymmetric) configurations
 334          */
 335         u8      drb[4][2];
 336         int     row;
 337         int    dualch;
 338
 339         for (dualch = 1, row = 0; dualch && (row < 4); row++) {
 340                 drb[row][0] = readb(mch_window + I82975X_DRB + row);
 341                 drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
 342                 dualch = dualch && (drb[row][0] == drb[row][1]);
 343         }
 344         return dualch;
 345 }
 346
 347 static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
 348 {
 349         /*
 350          * ECC is possible on i92975x ONLY with DEV_X8
 351          */
 352         return DEV_X8;
 353 }
 354
 355 static void i82975x_init_csrows(struct mem_ctl_info *mci,
 356                 struct pci_dev *pdev, void __iomem *mch_window)
 357 {
 358         static const char *labels[4] = {
 359                                                         "DIMM A1", "DIMM A2",
 360                                                         "DIMM B1", "DIMM B2"
 361                                                 };
 362         struct csrow_info *csrow;
 363         unsigned long last_cumul_size;
 364         u8 value;
 365         u32 cumul_size;
 366         int index, chan;
 367
 368         last_cumul_size = 0;
 369
 370         /*
 371          * 82875 comment:
 372          * The dram row boundary (DRB) reg values are boundary address
 373          * for each DRAM row with a granularity of 32 or 64MB (single/dual
 374          * channel operation).  DRB regs are cumulative; therefore DRB7 will
 375          * contain the total memory contained in all rows.
 376          *
 377          */
 378
 379         for (index = 0; index < mci->nr_csrows; index++) {
 380                 csrow = &mci->csrows[index];
 381
 382                 value = readb(mch_window + I82975X_DRB + index +
 383                                         ((index >= 4) ? 0x80 : 0));
 384                 cumul_size = value;
 385                 cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
 386                 /*
 387                  * Adjust cumul_size w.r.t number of channels
 388                  *
 389                  */
 390                 if (csrow->nr_channels > 1)
 391                         cumul_size <<= 1;
 392                 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
 393                         cumul_size);
 394
 395                 /*
 396                  * Initialise dram labels
 397                  * index values:
 398                  *   [0-7] for single-channel; i.e. csrow->nr_channels = 1
 399                  *   [0-3] for dual-channel; i.e. csrow->nr_channels = 2
 400                  */
 401                 for (chan = 0; chan < csrow->nr_channels; chan++)
 402                         strncpy(csrow->channels[chan].label,
 403                                         labels[(index >> 1) + (chan * 2)],
 404                                         EDAC_MC_LABEL_LEN);
 405
 406                 if (cumul_size == last_cumul_size)
 407                         continue;       /* not populated */
 408
 409                 csrow->first_page = last_cumul_size;
 410                 csrow->last_page = cumul_size - 1;
 411                 csrow->nr_pages = cumul_size - last_cumul_size;
 412                 last_cumul_size = cumul_size;
 413                 csrow->grain = 1 << 6;  /* I82975X_EAP has 64B resolution */
 414                 csrow->mtype = MEM_DDR2; /* I82975x supports only DDR2 */
 415                 csrow->dtype = i82975x_dram_type(mch_window, index);
 416                 csrow->edac_mode = EDAC_SECDED; /* only supported */
 417         }
 418 }
 419
 420 /* #define  i82975x_DEBUG_IOMEM */
 421
 422 #ifdef i82975x_DEBUG_IOMEM
 423 static void i82975x_print_dram_timings(void __iomem *mch_window)
 424 {
 425         /*
 426          * The register meanings are from Intel specs;
 427          * (shows 13-5-5-5 for 800-DDR2)
 428          * Asus P5W Bios reports 15-5-4-4
 429          * What's your religion?
 430          */
 431         static const int caslats[4] = { 5, 4, 3, 6 };
 432         u32     dtreg[2];
 433
 434         dtreg[0] = readl(mch_window + 0x114);
 435         dtreg[1] = readl(mch_window + 0x194);
 436         i82975x_printk(KERN_INFO, "DRAM Timings :     Ch0    Ch1\n"
 437                 "                RAS Active Min = %d     %d\n"
 438                 "                CAS latency    =  %d      %d\n"
 439                 "                RAS to CAS     =  %d      %d\n"
 440                 "                RAS precharge  =  %d      %d\n",
 441                 (dtreg[0] >> 19 ) & 0x0f,
 442                         (dtreg[1] >> 19) & 0x0f,
 443                 caslats[(dtreg[0] >> 8) & 0x03],
 444                         caslats[(dtreg[1] >> 8) & 0x03],
 445                 ((dtreg[0] >> 4) & 0x07) + 2,
 446                         ((dtreg[1] >> 4) & 0x07) + 2,
 447                 (dtreg[0] & 0x07) + 2,
 448                         (dtreg[1] & 0x07) + 2
 449         );
 450
 451 }
 452 #endif
 453
 454 static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
 455 {
 456         int rc = -ENODEV;
 457         struct mem_ctl_info *mci;
 458         struct i82975x_pvt *pvt;
 459         void __iomem *mch_window;
 460         u32 mchbar;
 461         u32 drc[2];
 462         struct i82975x_error_info discard;
 463         int     chans;
 464 #ifdef i82975x_DEBUG_IOMEM
 465         u8 c0drb[4];
 466         u8 c1drb[4];
 467 #endif
 468
 469         debugf0("%s()\n", __func__);
 470
 471         pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
 472         if (!(mchbar & 1)) {
 473                 debugf3("%s(): failed, MCHBAR disabled!\n", __func__);
 474                 goto fail0;
 475         }
 476         mchbar &= 0xffffc000;   /* bits 31:14 used for 16K window */
 477         mch_window = ioremap_nocache(mchbar, 0x1000);
 478
 479 #ifdef i82975x_DEBUG_IOMEM
 480         i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
 481                                         mchbar, mch_window);
 482
 483         c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
 484         c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
 485         c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
 486         c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
 487         c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
 488         c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
 489         c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
 490         c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
 491         i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
 492         i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
 493         i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
 494         i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
 495         i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
 496         i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
 497         i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
 498         i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
 499 #endif
 500
 501         drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
 502         drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
 503 #ifdef i82975x_DEBUG_IOMEM
 504         i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
 505                         ((drc[0] >> 21) & 3) == 1 ?
 506                                 "ECC enabled" : "ECC disabled");
 507         i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
 508                         ((drc[1] >> 21) & 3) == 1 ?
 509                                 "ECC enabled" : "ECC disabled");
 510
 511         i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
 512                 readw(mch_window + I82975X_C0BNKARC));
 513         i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
 514                 readw(mch_window + I82975X_C1BNKARC));
 515         i82975x_print_dram_timings(mch_window);
 516         goto fail1;
 517 #endif
 518         if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) {
 519                 i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
 520                 goto fail1;
 521         }
 522
 523         chans = dual_channel_active(mch_window) + 1;
 524
 525         /* assuming only one controller, index thus is 0 */
 526         mci = edac_mc_alloc(sizeof(*pvt), I82975X_NR_CSROWS(chans),
 527                                         chans, 0);
 528         if (!mci) {
 529                 rc = -ENOMEM;
 530                 goto fail1;
 531         }
 532
 533         debugf3("%s(): init mci\n", __func__);
 534         mci->dev = &pdev->dev;
 535         mci->mtype_cap = MEM_FLAG_DDR2;
 536         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 537         mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 538         mci->mod_name = EDAC_MOD_STR;
 539         mci->mod_ver = I82975X_REVISION;
 540         mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
 541         mci->dev_name = pci_name(pdev);
 542         mci->edac_check = i82975x_check;
 543         mci->ctl_page_to_phys = NULL;
 544         debugf3("%s(): init pvt\n", __func__);
 545         pvt = (struct i82975x_pvt *) mci->pvt_info;
 546         pvt->mch_window = mch_window;
 547         i82975x_init_csrows(mci, pdev, mch_window);
 548         mci->scrub_mode = SCRUB_HW_SRC;
 549         i82975x_get_error_info(mci, &discard);  /* clear counters */
 550
 551         /* finalize this instance of memory controller with edac core */
 552         if (edac_mc_add_mc(mci)) {
 553                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 554                 goto fail2;
 555         }
 556
 557         /* get this far and it's successful */
 558         debugf3("%s(): success\n", __func__);
 559         return 0;
 560
 561 fail2:
 562         edac_mc_free(mci);
 563
 564 fail1:
 565         iounmap(mch_window);
 566 fail0:
 567         return rc;
 568 }
 569
 570 /* returns count (>= 0), or negative on error */
 571 static int __devinit i82975x_init_one(struct pci_dev *pdev,
 572                 const struct pci_device_id *ent)
 573 {
 574         int rc;
 575
 576         debugf0("%s()\n", __func__);
 577
 578         if (pci_enable_device(pdev) < 0)
 579                 return -EIO;
 580
 581         rc = i82975x_probe1(pdev, ent->driver_data);
 582
 583         if (mci_pdev == NULL)
 584                 mci_pdev = pci_dev_get(pdev);
 585
 586         return rc;
 587 }
 588
 589 static void __devexit i82975x_remove_one(struct pci_dev *pdev)
 590 {
 591         struct mem_ctl_info *mci;
 592         struct i82975x_pvt *pvt;
 593
 594         debugf0("%s()\n", __func__);
 595
 596         mci = edac_mc_del_mc(&pdev->dev);
 597         if (mci  == NULL)
 598                 return;
 599
 600         pvt = mci->pvt_info;
 601         if (pvt->mch_window)
 602                 iounmap( pvt->mch_window );
 603
 604         edac_mc_free(mci);
 605 }
 606
 607 static const struct pci_device_id i82975x_pci_tbl[] __devinitdata = {
 608         {
 609                 PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 610                 I82975X
 611         },
 612         {
 613                 0,
 614         }       /* 0 terminated list. */
 615 };
 616
 617 MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);
 618
 619 static struct pci_driver i82975x_driver = {
 620         .name = EDAC_MOD_STR,
 621         .probe = i82975x_init_one,
 622         .remove = __devexit_p(i82975x_remove_one),
 623         .id_table = i82975x_pci_tbl,
 624 };
 625
 626 static int __init i82975x_init(void)
 627 {
 628         int pci_rc;
 629
 630         debugf3("%s()\n", __func__);
 631
 632        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 633        opstate_init();
 634
 635         pci_rc = pci_register_driver(&i82975x_driver);
 636         if (pci_rc < 0)
 637                 goto fail0;
 638
 639         if (mci_pdev == NULL) {
 640                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 641                                 PCI_DEVICE_ID_INTEL_82975_0, NULL);
 642
 643                 if (!mci_pdev) {
 644                         debugf0("i82975x pci_get_device fail\n");
 645                         pci_rc = -ENODEV;
 646                         goto fail1;
 647                 }
 648
 649                 pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);
 650
 651                 if (pci_rc < 0) {
 652                         debugf0("i82975x init fail\n");
 653                         pci_rc = -ENODEV;
 654                         goto fail1;
 655                 }
 656         }
 657
 658         return 0;
 659
 660 fail1:
 661         pci_unregister_driver(&i82975x_driver);
 662
 663 fail0:
 664         if (mci_pdev != NULL)
 665                 pci_dev_put(mci_pdev);
 666
 667         return pci_rc;
 668 }
 669
 670 static void __exit i82975x_exit(void)
 671 {
 672         debugf3("%s()\n", __func__);
 673
 674         pci_unregister_driver(&i82975x_driver);
 675
 676         if (!i82975x_registered) {
 677                 i82975x_remove_one(mci_pdev);
 678                 pci_dev_put(mci_pdev);
 679         }
 680 }
 681
 682 module_init(i82975x_init);
 683 module_exit(i82975x_exit);
 684
 685 MODULE_LICENSE("GPL");
 686 MODULE_AUTHOR("Arvind R. <arvino55@gmail.com>");
 687 MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");
 688
 689 module_param(edac_op_state, int, 0444);
 690 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");