err.no Git - linux-2.6/blob - 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/slab.h>
  17 #include <linux/edac.h>
  18 #include "edac_core.h"
  19
  20 #define I82975X_REVISION        " Ver: 1.0.0 " __DATE__
  21 #define EDAC_MOD_STR            "i82975x_edac"
  22
  23 #define i82975x_printk(level, fmt, arg...) \
  24         edac_printk(level, "i82975x", fmt, ##arg)
  25
  26 #define i82975x_mc_printk(mci, level, fmt, arg...) \
  27         edac_mc_chipset_printk(mci, level, "i82975x", fmt, ##arg)
  28
  29 #ifndef PCI_DEVICE_ID_INTEL_82975_0
  30 #define PCI_DEVICE_ID_INTEL_82975_0     0x277c
  31 #endif                          /* PCI_DEVICE_ID_INTEL_82975_0 */
  32
  33 #define I82975X_NR_CSROWS(nr_chans)             (8/(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 => x16 devices; i.e 4 banks
 165                                          * 01 => x8  devices; i.e 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->dev);
 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, multi_chan, chan;
 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         chan = info->eap & 1;
 297         info->eap >>= 1;
 298         if (info->xeap )
 299                 info->eap |= 0x80000000;
 300         info->eap >>= PAGE_SHIFT;
 301         row = edac_mc_find_csrow_by_page(mci, info->eap);
 302
 303         if (info->errsts & 0x0002)
 304                 edac_mc_handle_ue(mci, info->eap, 0, row, "i82975x UE");
 305         else
 306                 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row,
 307                                 multi_chan ? chan : 0,
 308                                 "i82975x CE");
 309
 310         return 1;
 311 }
 312
 313 static void i82975x_check(struct mem_ctl_info *mci)
 314 {
 315         struct i82975x_error_info info;
 316
 317         debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
 318         i82975x_get_error_info(mci, &info);
 319         i82975x_process_error_info(mci, &info, 1);
 320 }
 321
 322 /* Return 1 if dual channel mode is active.  Else return 0. */
 323 static int dual_channel_active(void __iomem *mch_window)
 324 {
 325         /*
 326          * We treat interleaved-symmetric configuration as dual-channel - EAP's
 327          * bit-0 giving the channel of the error location.
 328          *
 329          * All other configurations are treated as single channel - the EAP's
 330          * bit-0 will resolve ok in symmetric area of mixed
 331          * (symmetric/asymmetric) configurations
 332          */
 333         u8      drb[4][2];
 334         int     row;
 335         int    dualch;
 336
 337         for (dualch = 1, row = 0; dualch && (row < 4); row++) {
 338                 drb[row][0] = readb(mch_window + I82975X_DRB + row);
 339                 drb[row][1] = readb(mch_window + I82975X_DRB + row + 0x80);
 340                 dualch = dualch && (drb[row][0] == drb[row][1]);
 341         }
 342         return dualch;
 343 }
 344
 345 static enum dev_type i82975x_dram_type(void __iomem *mch_window, int rank)
 346 {
 347         /*
 348          * ASUS P5W DH either does not program this register or programs
 349          * it wrong!
 350          * ECC is possible on i92975x ONLY with DEV_X8 which should mean 'val'
 351          * for each rank should be 01b - the LSB of the word should be 0x55;
 352          * but it reads 0!
 353          */
 354         return DEV_X8;
 355 }
 356
 357 static void i82975x_init_csrows(struct mem_ctl_info *mci,
 358                 struct pci_dev *pdev, void __iomem *mch_window)
 359 {
 360         struct csrow_info *csrow;
 361         unsigned long last_cumul_size;
 362         u8 value;
 363         u32 cumul_size;
 364         int index;
 365
 366         last_cumul_size = 0;
 367
 368         /*
 369          * 82875 comment:
 370          * The dram row boundary (DRB) reg values are boundary address
 371          * for each DRAM row with a granularity of 32 or 64MB (single/dual
 372          * channel operation).  DRB regs are cumulative; therefore DRB7 will
 373          * contain the total memory contained in all eight rows.
 374          *
 375          * FIXME:
 376          *  EDAC currently works for Dual-channel Interleaved configuration.
 377          *  Other configurations, which the chip supports, need fixing/testing.
 378          *
 379          */
 380
 381         for (index = 0; index < mci->nr_csrows; index++) {
 382                 csrow = &mci->csrows[index];
 383
 384                 value = readb(mch_window + I82975X_DRB + index +
 385                                         ((index >= 4) ? 0x80 : 0));
 386                 cumul_size = value;
 387                 cumul_size <<= (I82975X_DRB_SHIFT - PAGE_SHIFT);
 388                 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
 389                         cumul_size);
 390                 if (cumul_size == last_cumul_size)
 391                         continue;       /* not populated */
 392
 393                 csrow->first_page = last_cumul_size;
 394                 csrow->last_page = cumul_size - 1;
 395                 csrow->nr_pages = cumul_size - last_cumul_size;
 396                 last_cumul_size = cumul_size;
 397                 csrow->grain = 1 << 7;  /* I82975X_EAP has 128B resolution */
 398                 csrow->mtype = MEM_DDR; /* i82975x supports only DDR2 */
 399                 csrow->dtype = i82975x_dram_type(mch_window, index);
 400                 csrow->edac_mode = EDAC_SECDED; /* only supported */
 401         }
 402 }
 403
 404 /* #define  i82975x_DEBUG_IOMEM */
 405
 406 #ifdef i82975x_DEBUG_IOMEM
 407 static void i82975x_print_dram_timings(void __iomem *mch_window)
 408 {
 409         /*
 410          * The register meanings are from Intel specs;
 411          * (shows 13-5-5-5 for 800-DDR2)
 412          * Asus P5W Bios reports 15-5-4-4
 413          * What's your religion?
 414          */
 415         static const int caslats[4] = { 5, 4, 3, 6 };
 416         u32     dtreg[2];
 417
 418         dtreg[0] = readl(mch_window + 0x114);
 419         dtreg[1] = readl(mch_window + 0x194);
 420         i82975x_printk(KERN_INFO, "DRAM Timings :     Ch0    Ch1\n"
 421                 "                RAS Active Min = %d     %d\n"
 422                 "                CAS latency    =  %d      %d\n"
 423                 "                RAS to CAS     =  %d      %d\n"
 424                 "                RAS precharge  =  %d      %d\n",
 425                 (dtreg[0] >> 19 ) & 0x0f,
 426                         (dtreg[1] >> 19) & 0x0f,
 427                 caslats[(dtreg[0] >> 8) & 0x03],
 428                         caslats[(dtreg[1] >> 8) & 0x03],
 429                 ((dtreg[0] >> 4) & 0x07) + 2,
 430                         ((dtreg[1] >> 4) & 0x07) + 2,
 431                 (dtreg[0] & 0x07) + 2,
 432                         (dtreg[1] & 0x07) + 2
 433         );
 434
 435 }
 436 #endif
 437
 438 static int i82975x_probe1(struct pci_dev *pdev, int dev_idx)
 439 {
 440         int rc = -ENODEV;
 441         struct mem_ctl_info *mci;
 442         struct i82975x_pvt *pvt;
 443         void __iomem *mch_window;
 444         u32 mchbar;
 445         u32 drc[2];
 446         struct i82975x_error_info discard;
 447         int     chans;
 448 #ifdef i82975x_DEBUG_IOMEM
 449         u8 c0drb[4];
 450         u8 c1drb[4];
 451 #endif
 452
 453         debugf0("%s()\n", __func__);
 454
 455         pci_read_config_dword(pdev, I82975X_MCHBAR, &mchbar);
 456         if (!(mchbar & 1)) {
 457                 debugf3("%s(): failed, MCHBAR disabled!\n", __func__);
 458                 goto fail0;
 459         }
 460         mchbar &= 0xffffc000;   /* bits 31:14 used for 16K window */
 461         mch_window = ioremap_nocache(mchbar, 0x1000);
 462
 463 #ifdef i82975x_DEBUG_IOMEM
 464         i82975x_printk(KERN_INFO, "MCHBAR real = %0x, remapped = %p\n",
 465                                         mchbar, mch_window);
 466
 467         c0drb[0] = readb(mch_window + I82975X_DRB_CH0R0);
 468         c0drb[1] = readb(mch_window + I82975X_DRB_CH0R1);
 469         c0drb[2] = readb(mch_window + I82975X_DRB_CH0R2);
 470         c0drb[3] = readb(mch_window + I82975X_DRB_CH0R3);
 471         c1drb[0] = readb(mch_window + I82975X_DRB_CH1R0);
 472         c1drb[1] = readb(mch_window + I82975X_DRB_CH1R1);
 473         c1drb[2] = readb(mch_window + I82975X_DRB_CH1R2);
 474         c1drb[3] = readb(mch_window + I82975X_DRB_CH1R3);
 475         i82975x_printk(KERN_INFO, "DRBCH0R0 = 0x%02x\n", c0drb[0]);
 476         i82975x_printk(KERN_INFO, "DRBCH0R1 = 0x%02x\n", c0drb[1]);
 477         i82975x_printk(KERN_INFO, "DRBCH0R2 = 0x%02x\n", c0drb[2]);
 478         i82975x_printk(KERN_INFO, "DRBCH0R3 = 0x%02x\n", c0drb[3]);
 479         i82975x_printk(KERN_INFO, "DRBCH1R0 = 0x%02x\n", c1drb[0]);
 480         i82975x_printk(KERN_INFO, "DRBCH1R1 = 0x%02x\n", c1drb[1]);
 481         i82975x_printk(KERN_INFO, "DRBCH1R2 = 0x%02x\n", c1drb[2]);
 482         i82975x_printk(KERN_INFO, "DRBCH1R3 = 0x%02x\n", c1drb[3]);
 483 #endif
 484
 485         drc[0] = readl(mch_window + I82975X_DRC_CH0M0);
 486         drc[1] = readl(mch_window + I82975X_DRC_CH1M0);
 487 #ifdef i82975x_DEBUG_IOMEM
 488         i82975x_printk(KERN_INFO, "DRC_CH0 = %0x, %s\n", drc[0],
 489                         ((drc[0] >> 21) & 3) == 1 ?
 490                                 "ECC enabled" : "ECC disabled");
 491         i82975x_printk(KERN_INFO, "DRC_CH1 = %0x, %s\n", drc[1],
 492                         ((drc[1] >> 21) & 3) == 1 ?
 493                                 "ECC enabled" : "ECC disabled");
 494
 495         i82975x_printk(KERN_INFO, "C0 BNKARC = %0x\n",
 496                 readw(mch_window + I82975X_C0BNKARC));
 497         i82975x_printk(KERN_INFO, "C1 BNKARC = %0x\n",
 498                 readw(mch_window + I82975X_C1BNKARC));
 499         i82975x_print_dram_timings(mch_window);
 500         goto fail1;
 501 #endif
 502         if (!(((drc[0] >> 21) & 3) == 1 || ((drc[1] >> 21) & 3) == 1)) {
 503                 i82975x_printk(KERN_INFO, "ECC disabled on both channels.\n");
 504                 goto fail1;
 505         }
 506
 507         chans = dual_channel_active(mch_window) + 1;
 508
 509         /* assuming only one controller, index thus is 0 */
 510         mci = edac_mc_alloc(sizeof(*pvt), I82975X_NR_CSROWS(chans),
 511                                         chans, 0);
 512         if (!mci) {
 513                 rc = -ENOMEM;
 514                 goto fail1;
 515         }
 516
 517         debugf3("%s(): init mci\n", __func__);
 518         mci->dev = &pdev->dev;
 519         mci->mtype_cap = MEM_FLAG_DDR;
 520         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 521         mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 522         mci->mod_name = EDAC_MOD_STR;
 523         mci->mod_ver = I82975X_REVISION;
 524         mci->ctl_name = i82975x_devs[dev_idx].ctl_name;
 525         mci->edac_check = i82975x_check;
 526         mci->ctl_page_to_phys = NULL;
 527         debugf3("%s(): init pvt\n", __func__);
 528         pvt = (struct i82975x_pvt *) mci->pvt_info;
 529         pvt->mch_window = mch_window;
 530         i82975x_init_csrows(mci, pdev, mch_window);
 531         i82975x_get_error_info(mci, &discard);  /* clear counters */
 532
 533         /* finalize this instance of memory controller with edac core */
 534         if (edac_mc_add_mc(mci)) {
 535                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 536                 goto fail2;
 537         }
 538
 539         /* get this far and it's successful */
 540         debugf3("%s(): success\n", __func__);
 541         return 0;
 542
 543 fail2:
 544         edac_mc_free(mci);
 545
 546 fail1:
 547         iounmap(mch_window);
 548 fail0:
 549         return rc;
 550 }
 551
 552 /* returns count (>= 0), or negative on error */
 553 static int __devinit i82975x_init_one(struct pci_dev *pdev,
 554                 const struct pci_device_id *ent)
 555 {
 556         int rc;
 557
 558         debugf0("%s()\n", __func__);
 559
 560         if (pci_enable_device(pdev) < 0)
 561                 return -EIO;
 562
 563         rc = i82975x_probe1(pdev, ent->driver_data);
 564
 565         if (mci_pdev == NULL)
 566                 mci_pdev = pci_dev_get(pdev);
 567
 568         return rc;
 569 }
 570
 571 static void __devexit i82975x_remove_one(struct pci_dev *pdev)
 572 {
 573         struct mem_ctl_info *mci;
 574         struct i82975x_pvt *pvt;
 575
 576         debugf0("%s()\n", __func__);
 577
 578         mci = edac_mc_del_mc(&pdev->dev);
 579         if (mci  == NULL)
 580                 return;
 581
 582         pvt = mci->pvt_info;
 583         if (pvt->mch_window)
 584                 iounmap( pvt->mch_window );
 585
 586         edac_mc_free(mci);
 587 }
 588
 589 static const struct pci_device_id i82975x_pci_tbl[] __devinitdata = {
 590         {
 591                 PCI_VEND_DEV(INTEL, 82975_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 592                 I82975X
 593         },
 594         {
 595                 0,
 596         }       /* 0 terminated list. */
 597 };
 598
 599 MODULE_DEVICE_TABLE(pci, i82975x_pci_tbl);
 600
 601 static struct pci_driver i82975x_driver = {
 602         .name = EDAC_MOD_STR,
 603         .probe = i82975x_init_one,
 604         .remove = __devexit_p(i82975x_remove_one),
 605         .id_table = i82975x_pci_tbl,
 606 };
 607
 608 static int __init i82975x_init(void)
 609 {
 610         int pci_rc;
 611
 612         debugf3("%s()\n", __func__);
 613
 614        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 615        opstate_init();
 616
 617         pci_rc = pci_register_driver(&i82975x_driver);
 618         if (pci_rc < 0)
 619                 goto fail0;
 620
 621         if (mci_pdev == NULL) {
 622                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 623                                 PCI_DEVICE_ID_INTEL_82975_0, NULL);
 624
 625                 if (!mci_pdev) {
 626                         debugf0("i82975x pci_get_device fail\n");
 627                         pci_rc = -ENODEV;
 628                         goto fail1;
 629                 }
 630
 631                 pci_rc = i82975x_init_one(mci_pdev, i82975x_pci_tbl);
 632
 633                 if (pci_rc < 0) {
 634                         debugf0("i82975x init fail\n");
 635                         pci_rc = -ENODEV;
 636                         goto fail1;
 637                 }
 638         }
 639
 640         return 0;
 641
 642 fail1:
 643         pci_unregister_driver(&i82975x_driver);
 644
 645 fail0:
 646         if (mci_pdev != NULL)
 647                 pci_dev_put(mci_pdev);
 648
 649         return pci_rc;
 650 }
 651
 652 static void __exit i82975x_exit(void)
 653 {
 654         debugf3("%s()\n", __func__);
 655
 656         pci_unregister_driver(&i82975x_driver);
 657
 658         if (!i82975x_registered) {
 659                 i82975x_remove_one(mci_pdev);
 660                 pci_dev_put(mci_pdev);
 661         }
 662 }
 663
 664 module_init(i82975x_init);
 665 module_exit(i82975x_exit);
 666
 667 MODULE_LICENSE("GPL");
 668 MODULE_AUTHOR("Arvind R. <arvind@acarlab.com>");
 669 MODULE_DESCRIPTION("MC support for Intel 82975 memory hub controllers");
 670
 671 module_param(edac_op_state, int, 0444);
 672 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");