drivers/edac/i5100_edac.c

   1 /*
   2  * Intel 5100 Memory Controllers kernel module
   3  *
   4  * This file may be distributed under the terms of the
   5  * GNU General Public License.
   6  *
   7  * This module is based on the following document:
   8  *
   9  * Intel 5100X Chipset Memory Controller Hub (MCH) - Datasheet
  10  *      http://download.intel.com/design/chipsets/datashts/318378.pdf
  11  *
  12  * The intel 5100 has two independent channels. EDAC core currently
  13  * can not reflect this configuration so instead the chip-select
  14  * rows for each respective channel are laid out one after another,
  15  * the first half belonging to channel 0, the second half belonging
  16  * to channel 1.
  17  *
  18  * This driver is for DDR2 DIMMs, and it uses chip select to select among the
  19  * several ranks. However, instead of showing memories as ranks, it outputs
  20  * them as DIMM's. An internal table creates the association between ranks
  21  * and DIMM's.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/pci.h>
  26 #include <linux/pci_ids.h>
  27 #include <linux/edac.h>
  28 #include <linux/delay.h>
  29 #include <linux/mmzone.h>
  30 #include <linux/debugfs.h>
  31
  32 #include "edac_module.h"
  33
  34 /* register addresses */
  35
  36 /* device 16, func 1 */
  37 #define I5100_MC                0x40    /* Memory Control Register */
  38 #define         I5100_MC_SCRBEN_MASK    (1 << 7)
  39 #define         I5100_MC_SCRBDONE_MASK  (1 << 4)
  40 #define I5100_MS                0x44    /* Memory Status Register */
  41 #define I5100_SPDDATA           0x48    /* Serial Presence Detect Status Reg */
  42 #define I5100_SPDCMD            0x4c    /* Serial Presence Detect Command Reg */
  43 #define I5100_TOLM              0x6c    /* Top of Low Memory */
  44 #define I5100_MIR0              0x80    /* Memory Interleave Range 0 */
  45 #define I5100_MIR1              0x84    /* Memory Interleave Range 1 */
  46 #define I5100_AMIR_0            0x8c    /* Adjusted Memory Interleave Range 0 */
  47 #define I5100_AMIR_1            0x90    /* Adjusted Memory Interleave Range 1 */
  48 #define I5100_FERR_NF_MEM       0xa0    /* MC First Non Fatal Errors */
  49 #define         I5100_FERR_NF_MEM_M16ERR_MASK   (1 << 16)
  50 #define         I5100_FERR_NF_MEM_M15ERR_MASK   (1 << 15)
  51 #define         I5100_FERR_NF_MEM_M14ERR_MASK   (1 << 14)
  52 #define         I5100_FERR_NF_MEM_M12ERR_MASK   (1 << 12)
  53 #define         I5100_FERR_NF_MEM_M11ERR_MASK   (1 << 11)
  54 #define         I5100_FERR_NF_MEM_M10ERR_MASK   (1 << 10)
  55 #define         I5100_FERR_NF_MEM_M6ERR_MASK    (1 << 6)
  56 #define         I5100_FERR_NF_MEM_M5ERR_MASK    (1 << 5)
  57 #define         I5100_FERR_NF_MEM_M4ERR_MASK    (1 << 4)
  58 #define         I5100_FERR_NF_MEM_M1ERR_MASK    (1 << 1)
  59 #define         I5100_FERR_NF_MEM_ANY_MASK      \
  60                         (I5100_FERR_NF_MEM_M16ERR_MASK | \
  61                         I5100_FERR_NF_MEM_M15ERR_MASK | \
  62                         I5100_FERR_NF_MEM_M14ERR_MASK | \
  63                         I5100_FERR_NF_MEM_M12ERR_MASK | \
  64                         I5100_FERR_NF_MEM_M11ERR_MASK | \
  65                         I5100_FERR_NF_MEM_M10ERR_MASK | \
  66                         I5100_FERR_NF_MEM_M6ERR_MASK | \
  67                         I5100_FERR_NF_MEM_M5ERR_MASK | \
  68                         I5100_FERR_NF_MEM_M4ERR_MASK | \
  69                         I5100_FERR_NF_MEM_M1ERR_MASK)
  70 #define I5100_NERR_NF_MEM       0xa4    /* MC Next Non-Fatal Errors */
  71 #define I5100_EMASK_MEM         0xa8    /* MC Error Mask Register */
  72 #define I5100_MEM0EINJMSK0      0x200   /* Injection Mask0 Register Channel 0 */
  73 #define I5100_MEM1EINJMSK0      0x208   /* Injection Mask0 Register Channel 1 */
  74 #define         I5100_MEMXEINJMSK0_EINJEN       (1 << 27)
  75 #define I5100_MEM0EINJMSK1      0x204   /* Injection Mask1 Register Channel 0 */
  76 #define I5100_MEM1EINJMSK1      0x206   /* Injection Mask1 Register Channel 1 */
  77
  78 /* Device 19, Function 0 */
  79 #define I5100_DINJ0 0x9a
  80
  81 /* device 21 and 22, func 0 */
  82 #define I5100_MTR_0     0x154   /* Memory Technology Registers 0-3 */
  83 #define I5100_DMIR      0x15c   /* DIMM Interleave Range */
  84 #define I5100_VALIDLOG  0x18c   /* Valid Log Markers */
  85 #define I5100_NRECMEMA  0x190   /* Non-Recoverable Memory Error Log Reg A */
  86 #define I5100_NRECMEMB  0x194   /* Non-Recoverable Memory Error Log Reg B */
  87 #define I5100_REDMEMA   0x198   /* Recoverable Memory Data Error Log Reg A */
  88 #define I5100_REDMEMB   0x19c   /* Recoverable Memory Data Error Log Reg B */
  89 #define I5100_RECMEMA   0x1a0   /* Recoverable Memory Error Log Reg A */
  90 #define I5100_RECMEMB   0x1a4   /* Recoverable Memory Error Log Reg B */
  91 #define I5100_MTR_4     0x1b0   /* Memory Technology Registers 4,5 */
  92
  93 /* bit field accessors */
  94
  95 static inline u32 i5100_mc_scrben(u32 mc)
  96 {
  97         return mc >> 7 & 1;
  98 }
  99
 100 static inline u32 i5100_mc_errdeten(u32 mc)
 101 {
 102         return mc >> 5 & 1;
 103 }
 104
 105 static inline u32 i5100_mc_scrbdone(u32 mc)
 106 {
 107         return mc >> 4 & 1;
 108 }
 109
 110 static inline u16 i5100_spddata_rdo(u16 a)
 111 {
 112         return a >> 15 & 1;
 113 }
 114
 115 static inline u16 i5100_spddata_sbe(u16 a)
 116 {
 117         return a >> 13 & 1;
 118 }
 119
 120 static inline u16 i5100_spddata_busy(u16 a)
 121 {
 122         return a >> 12 & 1;
 123 }
 124
 125 static inline u16 i5100_spddata_data(u16 a)
 126 {
 127         return a & ((1 << 8) - 1);
 128 }
 129
 130 static inline u32 i5100_spdcmd_create(u32 dti, u32 ckovrd, u32 sa, u32 ba,
 131                                       u32 data, u32 cmd)
 132 {
 133         return  ((dti & ((1 << 4) - 1))  << 28) |
 134                 ((ckovrd & 1)            << 27) |
 135                 ((sa & ((1 << 3) - 1))   << 24) |
 136                 ((ba & ((1 << 8) - 1))   << 16) |
 137                 ((data & ((1 << 8) - 1)) <<  8) |
 138                 (cmd & 1);
 139 }
 140
 141 static inline u16 i5100_tolm_tolm(u16 a)
 142 {
 143         return a >> 12 & ((1 << 4) - 1);
 144 }
 145
 146 static inline u16 i5100_mir_limit(u16 a)
 147 {
 148         return a >> 4 & ((1 << 12) - 1);
 149 }
 150
 151 static inline u16 i5100_mir_way1(u16 a)
 152 {
 153         return a >> 1 & 1;
 154 }
 155
 156 static inline u16 i5100_mir_way0(u16 a)
 157 {
 158         return a & 1;
 159 }
 160
 161 static inline u32 i5100_ferr_nf_mem_chan_indx(u32 a)
 162 {
 163         return a >> 28 & 1;
 164 }
 165
 166 static inline u32 i5100_ferr_nf_mem_any(u32 a)
 167 {
 168         return a & I5100_FERR_NF_MEM_ANY_MASK;
 169 }
 170
 171 static inline u32 i5100_nerr_nf_mem_any(u32 a)
 172 {
 173         return i5100_ferr_nf_mem_any(a);
 174 }
 175
 176 static inline u32 i5100_dmir_limit(u32 a)
 177 {
 178         return a >> 16 & ((1 << 11) - 1);
 179 }
 180
 181 static inline u32 i5100_dmir_rank(u32 a, u32 i)
 182 {
 183         return a >> (4 * i) & ((1 << 2) - 1);
 184 }
 185
 186 static inline u16 i5100_mtr_present(u16 a)
 187 {
 188         return a >> 10 & 1;
 189 }
 190
 191 static inline u16 i5100_mtr_ethrottle(u16 a)
 192 {
 193         return a >> 9 & 1;
 194 }
 195
 196 static inline u16 i5100_mtr_width(u16 a)
 197 {
 198         return a >> 8 & 1;
 199 }
 200
 201 static inline u16 i5100_mtr_numbank(u16 a)
 202 {
 203         return a >> 6 & 1;
 204 }
 205
 206 static inline u16 i5100_mtr_numrow(u16 a)
 207 {
 208         return a >> 2 & ((1 << 2) - 1);
 209 }
 210
 211 static inline u16 i5100_mtr_numcol(u16 a)
 212 {
 213         return a & ((1 << 2) - 1);
 214 }
 215
 216
 217 static inline u32 i5100_validlog_redmemvalid(u32 a)
 218 {
 219         return a >> 2 & 1;
 220 }
 221
 222 static inline u32 i5100_validlog_recmemvalid(u32 a)
 223 {
 224         return a >> 1 & 1;
 225 }
 226
 227 static inline u32 i5100_validlog_nrecmemvalid(u32 a)
 228 {
 229         return a & 1;
 230 }
 231
 232 static inline u32 i5100_nrecmema_merr(u32 a)
 233 {
 234         return a >> 15 & ((1 << 5) - 1);
 235 }
 236
 237 static inline u32 i5100_nrecmema_bank(u32 a)
 238 {
 239         return a >> 12 & ((1 << 3) - 1);
 240 }
 241
 242 static inline u32 i5100_nrecmema_rank(u32 a)
 243 {
 244         return a >>  8 & ((1 << 3) - 1);
 245 }
 246
 247 static inline u32 i5100_nrecmemb_cas(u32 a)
 248 {
 249         return a >> 16 & ((1 << 13) - 1);
 250 }
 251
 252 static inline u32 i5100_nrecmemb_ras(u32 a)
 253 {
 254         return a & ((1 << 16) - 1);
 255 }
 256
 257 static inline u32 i5100_recmema_merr(u32 a)
 258 {
 259         return i5100_nrecmema_merr(a);
 260 }
 261
 262 static inline u32 i5100_recmema_bank(u32 a)
 263 {
 264         return i5100_nrecmema_bank(a);
 265 }
 266
 267 static inline u32 i5100_recmema_rank(u32 a)
 268 {
 269         return i5100_nrecmema_rank(a);
 270 }
 271
 272 static inline u32 i5100_recmemb_cas(u32 a)
 273 {
 274         return i5100_nrecmemb_cas(a);
 275 }
 276
 277 static inline u32 i5100_recmemb_ras(u32 a)
 278 {
 279         return i5100_nrecmemb_ras(a);
 280 }
 281
 282 /* some generic limits */
 283 #define I5100_MAX_RANKS_PER_CHAN        6
 284 #define I5100_CHANNELS                      2
 285 #define I5100_MAX_RANKS_PER_DIMM        4
 286 #define I5100_DIMM_ADDR_LINES           (6 - 3) /* 64 bits / 8 bits per byte */
 287 #define I5100_MAX_DIMM_SLOTS_PER_CHAN   4
 288 #define I5100_MAX_RANK_INTERLEAVE       4
 289 #define I5100_MAX_DMIRS                 5
 290 #define I5100_SCRUB_REFRESH_RATE        (5 * 60 * HZ)
 291
 292 struct i5100_priv {
 293         /* ranks on each dimm -- 0 maps to not present -- obtained via SPD */
 294         int dimm_numrank[I5100_CHANNELS][I5100_MAX_DIMM_SLOTS_PER_CHAN];
 295
 296         /*
 297          * mainboard chip select map -- maps i5100 chip selects to
 298          * DIMM slot chip selects.  In the case of only 4 ranks per
 299          * channel, the mapping is fairly obvious but not unique.
 300          * we map -1 -> NC and assume both channels use the same
 301          * map...
 302          *
 303          */
 304         int dimm_csmap[I5100_MAX_DIMM_SLOTS_PER_CHAN][I5100_MAX_RANKS_PER_DIMM];
 305
 306         /* memory interleave range */
 307         struct {
 308                 u64      limit;
 309                 unsigned way[2];
 310         } mir[I5100_CHANNELS];
 311
 312         /* adjusted memory interleave range register */
 313         unsigned amir[I5100_CHANNELS];
 314
 315         /* dimm interleave range */
 316         struct {
 317                 unsigned rank[I5100_MAX_RANK_INTERLEAVE];
 318                 u64      limit;
 319         } dmir[I5100_CHANNELS][I5100_MAX_DMIRS];
 320
 321         /* memory technology registers... */
 322         struct {
 323                 unsigned present;       /* 0 or 1 */
 324                 unsigned ethrottle;     /* 0 or 1 */
 325                 unsigned width;         /* 4 or 8 bits  */
 326                 unsigned numbank;       /* 2 or 3 lines */
 327                 unsigned numrow;        /* 13 .. 16 lines */
 328                 unsigned numcol;        /* 11 .. 12 lines */
 329         } mtr[I5100_CHANNELS][I5100_MAX_RANKS_PER_CHAN];
 330
 331         u64 tolm;               /* top of low memory in bytes */
 332         unsigned ranksperchan;  /* number of ranks per channel */
 333
 334         struct pci_dev *mc;     /* device 16 func 1 */
 335         struct pci_dev *einj;   /* device 19 func 0 */
 336         struct pci_dev *ch0mm;  /* device 21 func 0 */
 337         struct pci_dev *ch1mm;  /* device 22 func 0 */
 338
 339         struct delayed_work i5100_scrubbing;
 340         int scrub_enable;
 341
 342         /* Error injection */
 343         u8 inject_channel;
 344         u8 inject_hlinesel;
 345         u8 inject_deviceptr1;
 346         u8 inject_deviceptr2;
 347         u16 inject_eccmask1;
 348         u16 inject_eccmask2;
 349
 350         struct dentry *debugfs;
 351 };
 352
 353 static struct dentry *i5100_debugfs;
 354
 355 /* map a rank/chan to a slot number on the mainboard */
 356 static int i5100_rank_to_slot(const struct mem_ctl_info *mci,
 357                               int chan, int rank)
 358 {
 359         const struct i5100_priv *priv = mci->pvt_info;
 360         int i;
 361
 362         for (i = 0; i < I5100_MAX_DIMM_SLOTS_PER_CHAN; i++) {
 363                 int j;
 364                 const int numrank = priv->dimm_numrank[chan][i];
 365
 366                 for (j = 0; j < numrank; j++)
 367                         if (priv->dimm_csmap[i][j] == rank)
 368                                 return i * 2 + chan;
 369         }
 370
 371         return -1;
 372 }
 373
 374 static const char *i5100_err_msg(unsigned err)
 375 {
 376         static const char *merrs[] = {
 377                 "unknown", /* 0 */
 378                 "uncorrectable data ECC on replay", /* 1 */
 379                 "unknown", /* 2 */
 380                 "unknown", /* 3 */
 381                 "aliased uncorrectable demand data ECC", /* 4 */
 382                 "aliased uncorrectable spare-copy data ECC", /* 5 */
 383                 "aliased uncorrectable patrol data ECC", /* 6 */
 384                 "unknown", /* 7 */
 385                 "unknown", /* 8 */
 386                 "unknown", /* 9 */
 387                 "non-aliased uncorrectable demand data ECC", /* 10 */
 388                 "non-aliased uncorrectable spare-copy data ECC", /* 11 */
 389                 "non-aliased uncorrectable patrol data ECC", /* 12 */
 390                 "unknown", /* 13 */
 391                 "correctable demand data ECC", /* 14 */
 392                 "correctable spare-copy data ECC", /* 15 */
 393                 "correctable patrol data ECC", /* 16 */
 394                 "unknown", /* 17 */
 395                 "SPD protocol error", /* 18 */
 396                 "unknown", /* 19 */
 397                 "spare copy initiated", /* 20 */
 398                 "spare copy completed", /* 21 */
 399         };
 400         unsigned i;
 401
 402         for (i = 0; i < ARRAY_SIZE(merrs); i++)
 403                 if (1 << i & err)
 404                         return merrs[i];
 405
 406         return "none";
 407 }
 408
 409 /* convert csrow index into a rank (per channel -- 0..5) */
 410 static unsigned int i5100_csrow_to_rank(const struct mem_ctl_info *mci,
 411                                         unsigned int csrow)
 412 {
 413         const struct i5100_priv *priv = mci->pvt_info;
 414
 415         return csrow % priv->ranksperchan;
 416 }
 417
 418 /* convert csrow index into a channel (0..1) */
 419 static unsigned int i5100_csrow_to_chan(const struct mem_ctl_info *mci,
 420                                         unsigned int csrow)
 421 {
 422         const struct i5100_priv *priv = mci->pvt_info;
 423
 424         return csrow / priv->ranksperchan;
 425 }
 426
 427 static void i5100_handle_ce(struct mem_ctl_info *mci,
 428                             int chan,
 429                             unsigned bank,
 430                             unsigned rank,
 431                             unsigned long syndrome,
 432                             unsigned cas,
 433                             unsigned ras,
 434                             const char *msg)
 435 {
 436         char detail[80];
 437
 438         /* Form out message */
 439         snprintf(detail, sizeof(detail),
 440                  "bank %u, cas %u, ras %u\n",
 441                  bank, cas, ras);
 442
 443         edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 444                              0, 0, syndrome,
 445                              chan, rank, -1,
 446                              msg, detail);
 447 }
 448
 449 static void i5100_handle_ue(struct mem_ctl_info *mci,
 450                             int chan,
 451                             unsigned bank,
 452                             unsigned rank,
 453                             unsigned long syndrome,
 454                             unsigned cas,
 455                             unsigned ras,
 456                             const char *msg)
 457 {
 458         char detail[80];
 459
 460         /* Form out message */
 461         snprintf(detail, sizeof(detail),
 462                  "bank %u, cas %u, ras %u\n",
 463                  bank, cas, ras);
 464
 465         edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 466                              0, 0, syndrome,
 467                              chan, rank, -1,
 468                              msg, detail);
 469 }
 470
 471 static void i5100_read_log(struct mem_ctl_info *mci, int chan,
 472                            u32 ferr, u32 nerr)
 473 {
 474         struct i5100_priv *priv = mci->pvt_info;
 475         struct pci_dev *pdev = (chan) ? priv->ch1mm : priv->ch0mm;
 476         u32 dw;
 477         u32 dw2;
 478         unsigned syndrome = 0;
 479         unsigned merr;
 480         unsigned bank;
 481         unsigned rank;
 482         unsigned cas;
 483         unsigned ras;
 484
 485         pci_read_config_dword(pdev, I5100_VALIDLOG, &dw);
 486
 487         if (i5100_validlog_redmemvalid(dw)) {
 488                 pci_read_config_dword(pdev, I5100_REDMEMA, &dw2);
 489                 syndrome = dw2;
 490                 pci_read_config_dword(pdev, I5100_REDMEMB, &dw2);
 491         }
 492
 493         if (i5100_validlog_recmemvalid(dw)) {
 494                 const char *msg;
 495
 496                 pci_read_config_dword(pdev, I5100_RECMEMA, &dw2);
 497                 merr = i5100_recmema_merr(dw2);
 498                 bank = i5100_recmema_bank(dw2);
 499                 rank = i5100_recmema_rank(dw2);
 500
 501                 pci_read_config_dword(pdev, I5100_RECMEMB, &dw2);
 502                 cas = i5100_recmemb_cas(dw2);
 503                 ras = i5100_recmemb_ras(dw2);
 504
 505                 /* FIXME:  not really sure if this is what merr is...
 506                  */
 507                 if (!merr)
 508                         msg = i5100_err_msg(ferr);
 509                 else
 510                         msg = i5100_err_msg(nerr);
 511
 512                 i5100_handle_ce(mci, chan, bank, rank, syndrome, cas, ras, msg);
 513         }
 514
 515         if (i5100_validlog_nrecmemvalid(dw)) {
 516                 const char *msg;
 517
 518                 pci_read_config_dword(pdev, I5100_NRECMEMA, &dw2);
 519                 merr = i5100_nrecmema_merr(dw2);
 520                 bank = i5100_nrecmema_bank(dw2);
 521                 rank = i5100_nrecmema_rank(dw2);
 522
 523                 pci_read_config_dword(pdev, I5100_NRECMEMB, &dw2);
 524                 cas = i5100_nrecmemb_cas(dw2);
 525                 ras = i5100_nrecmemb_ras(dw2);
 526
 527                 /* FIXME:  not really sure if this is what merr is...
 528                  */
 529                 if (!merr)
 530                         msg = i5100_err_msg(ferr);
 531                 else
 532                         msg = i5100_err_msg(nerr);
 533
 534                 i5100_handle_ue(mci, chan, bank, rank, syndrome, cas, ras, msg);
 535         }
 536
 537         pci_write_config_dword(pdev, I5100_VALIDLOG, dw);
 538 }
 539
 540 static void i5100_check_error(struct mem_ctl_info *mci)
 541 {
 542         struct i5100_priv *priv = mci->pvt_info;
 543         u32 dw, dw2;
 544
 545         pci_read_config_dword(priv->mc, I5100_FERR_NF_MEM, &dw);
 546         if (i5100_ferr_nf_mem_any(dw)) {
 547
 548                 pci_read_config_dword(priv->mc, I5100_NERR_NF_MEM, &dw2);
 549
 550                 i5100_read_log(mci, i5100_ferr_nf_mem_chan_indx(dw),
 551                                i5100_ferr_nf_mem_any(dw),
 552                                i5100_nerr_nf_mem_any(dw2));
 553
 554                 pci_write_config_dword(priv->mc, I5100_NERR_NF_MEM, dw2);
 555         }
 556         pci_write_config_dword(priv->mc, I5100_FERR_NF_MEM, dw);
 557 }
 558
 559 /* The i5100 chipset will scrub the entire memory once, then
 560  * set a done bit. Continuous scrubbing is achieved by enqueing
 561  * delayed work to a workqueue, checking every few minutes if
 562  * the scrubbing has completed and if so reinitiating it.
 563  */
 564
 565 static void i5100_refresh_scrubbing(struct work_struct *work)
 566 {
 567         struct delayed_work *i5100_scrubbing = to_delayed_work(work);
 568         struct i5100_priv *priv = container_of(i5100_scrubbing,
 569                                                struct i5100_priv,
 570                                                i5100_scrubbing);
 571         u32 dw;
 572
 573         pci_read_config_dword(priv->mc, I5100_MC, &dw);
 574
 575         if (priv->scrub_enable) {
 576
 577                 pci_read_config_dword(priv->mc, I5100_MC, &dw);
 578
 579                 if (i5100_mc_scrbdone(dw)) {
 580                         dw |= I5100_MC_SCRBEN_MASK;
 581                         pci_write_config_dword(priv->mc, I5100_MC, dw);
 582                         pci_read_config_dword(priv->mc, I5100_MC, &dw);
 583                 }
 584
 585                 schedule_delayed_work(&(priv->i5100_scrubbing),
 586                                       I5100_SCRUB_REFRESH_RATE);
 587         }
 588 }
 589 /*
 590  * The bandwidth is based on experimentation, feel free to refine it.
 591  */
 592 static int i5100_set_scrub_rate(struct mem_ctl_info *mci, u32 bandwidth)
 593 {
 594         struct i5100_priv *priv = mci->pvt_info;
 595         u32 dw;
 596
 597         pci_read_config_dword(priv->mc, I5100_MC, &dw);
 598         if (bandwidth) {
 599                 priv->scrub_enable = 1;
 600                 dw |= I5100_MC_SCRBEN_MASK;
 601                 schedule_delayed_work(&(priv->i5100_scrubbing),
 602                                       I5100_SCRUB_REFRESH_RATE);
 603         } else {
 604                 priv->scrub_enable = 0;
 605                 dw &= ~I5100_MC_SCRBEN_MASK;
 606                 cancel_delayed_work(&(priv->i5100_scrubbing));
 607         }
 608         pci_write_config_dword(priv->mc, I5100_MC, dw);
 609
 610         pci_read_config_dword(priv->mc, I5100_MC, &dw);
 611
 612         bandwidth = 5900000 * i5100_mc_scrben(dw);
 613
 614         return bandwidth;
 615 }
 616
 617 static int i5100_get_scrub_rate(struct mem_ctl_info *mci)
 618 {
 619         struct i5100_priv *priv = mci->pvt_info;
 620         u32 dw;
 621
 622         pci_read_config_dword(priv->mc, I5100_MC, &dw);
 623
 624         return 5900000 * i5100_mc_scrben(dw);
 625 }
 626
 627 static struct pci_dev *pci_get_device_func(unsigned vendor,
 628                                            unsigned device,
 629                                            unsigned func)
 630 {
 631         struct pci_dev *ret = NULL;
 632
 633         while (1) {
 634                 ret = pci_get_device(vendor, device, ret);
 635
 636                 if (!ret)
 637                         break;
 638
 639                 if (PCI_FUNC(ret->devfn) == func)
 640                         break;
 641         }
 642
 643         return ret;
 644 }
 645
 646 static unsigned long i5100_npages(struct mem_ctl_info *mci, unsigned int csrow)
 647 {
 648         struct i5100_priv *priv = mci->pvt_info;
 649         const unsigned int chan_rank = i5100_csrow_to_rank(mci, csrow);
 650         const unsigned int chan = i5100_csrow_to_chan(mci, csrow);
 651         unsigned addr_lines;
 652
 653         /* dimm present? */
 654         if (!priv->mtr[chan][chan_rank].present)
 655                 return 0ULL;
 656
 657         addr_lines =
 658                 I5100_DIMM_ADDR_LINES +
 659                 priv->mtr[chan][chan_rank].numcol +
 660                 priv->mtr[chan][chan_rank].numrow +
 661                 priv->mtr[chan][chan_rank].numbank;
 662
 663         return (unsigned long)
 664                 ((unsigned long long) (1ULL << addr_lines) / PAGE_SIZE);
 665 }
 666
 667 static void i5100_init_mtr(struct mem_ctl_info *mci)
 668 {
 669         struct i5100_priv *priv = mci->pvt_info;
 670         struct pci_dev *mms[2] = { priv->ch0mm, priv->ch1mm };
 671         int i;
 672
 673         for (i = 0; i < I5100_CHANNELS; i++) {
 674                 int j;
 675                 struct pci_dev *pdev = mms[i];
 676
 677                 for (j = 0; j < I5100_MAX_RANKS_PER_CHAN; j++) {
 678                         const unsigned addr =
 679                                 (j < 4) ? I5100_MTR_0 + j * 2 :
 680                                           I5100_MTR_4 + (j - 4) * 2;
 681                         u16 w;
 682
 683                         pci_read_config_word(pdev, addr, &w);
 684
 685                         priv->mtr[i][j].present = i5100_mtr_present(w);
 686                         priv->mtr[i][j].ethrottle = i5100_mtr_ethrottle(w);
 687                         priv->mtr[i][j].width = 4 + 4 * i5100_mtr_width(w);
 688                         priv->mtr[i][j].numbank = 2 + i5100_mtr_numbank(w);
 689                         priv->mtr[i][j].numrow = 13 + i5100_mtr_numrow(w);
 690                         priv->mtr[i][j].numcol = 10 + i5100_mtr_numcol(w);
 691                 }
 692         }
 693 }
 694
 695 /*
 696  * FIXME: make this into a real i2c adapter (so that dimm-decode
 697  * will work)?
 698  */
 699 static int i5100_read_spd_byte(const struct mem_ctl_info *mci,
 700                                u8 ch, u8 slot, u8 addr, u8 *byte)
 701 {
 702         struct i5100_priv *priv = mci->pvt_info;
 703         u16 w;
 704
 705         pci_read_config_word(priv->mc, I5100_SPDDATA, &w);
 706         if (i5100_spddata_busy(w))
 707                 return -1;
 708
 709         pci_write_config_dword(priv->mc, I5100_SPDCMD,
 710                                i5100_spdcmd_create(0xa, 1, ch * 4 + slot, addr,
 711                                                    0, 0));
 712
 713         /* wait up to 100ms */
 714         udelay(100);
 715         while (1) {
 716                 pci_read_config_word(priv->mc, I5100_SPDDATA, &w);
 717                 if (!i5100_spddata_busy(w))
 718                         break;
 719                 udelay(100);
 720         }
 721
 722         if (!i5100_spddata_rdo(w) || i5100_spddata_sbe(w))
 723                 return -1;
 724
 725         *byte = i5100_spddata_data(w);
 726
 727         return 0;
 728 }
 729
 730 /*
 731  * fill dimm chip select map
 732  *
 733  * FIXME:
 734  *   o not the only way to may chip selects to dimm slots
 735  *   o investigate if there is some way to obtain this map from the bios
 736  */
 737 static void i5100_init_dimm_csmap(struct mem_ctl_info *mci)
 738 {
 739         struct i5100_priv *priv = mci->pvt_info;
 740         int i;
 741
 742         for (i = 0; i < I5100_MAX_DIMM_SLOTS_PER_CHAN; i++) {
 743                 int j;
 744
 745                 for (j = 0; j < I5100_MAX_RANKS_PER_DIMM; j++)
 746                         priv->dimm_csmap[i][j] = -1; /* default NC */
 747         }
 748
 749         /* only 2 chip selects per slot... */
 750         if (priv->ranksperchan == 4) {
 751                 priv->dimm_csmap[0][0] = 0;
 752                 priv->dimm_csmap[0][1] = 3;
 753                 priv->dimm_csmap[1][0] = 1;
 754                 priv->dimm_csmap[1][1] = 2;
 755                 priv->dimm_csmap[2][0] = 2;
 756                 priv->dimm_csmap[3][0] = 3;
 757         } else {
 758                 priv->dimm_csmap[0][0] = 0;
 759                 priv->dimm_csmap[0][1] = 1;
 760                 priv->dimm_csmap[1][0] = 2;
 761                 priv->dimm_csmap[1][1] = 3;
 762                 priv->dimm_csmap[2][0] = 4;
 763                 priv->dimm_csmap[2][1] = 5;
 764         }
 765 }
 766
 767 static void i5100_init_dimm_layout(struct pci_dev *pdev,
 768                                    struct mem_ctl_info *mci)
 769 {
 770         struct i5100_priv *priv = mci->pvt_info;
 771         int i;
 772
 773         for (i = 0; i < I5100_CHANNELS; i++) {
 774                 int j;
 775
 776                 for (j = 0; j < I5100_MAX_DIMM_SLOTS_PER_CHAN; j++) {
 777                         u8 rank;
 778
 779                         if (i5100_read_spd_byte(mci, i, j, 5, &rank) < 0)
 780                                 priv->dimm_numrank[i][j] = 0;
 781                         else
 782                                 priv->dimm_numrank[i][j] = (rank & 3) + 1;
 783                 }
 784         }
 785
 786         i5100_init_dimm_csmap(mci);
 787 }
 788
 789 static void i5100_init_interleaving(struct pci_dev *pdev,
 790                                     struct mem_ctl_info *mci)
 791 {
 792         u16 w;
 793         u32 dw;
 794         struct i5100_priv *priv = mci->pvt_info;
 795         struct pci_dev *mms[2] = { priv->ch0mm, priv->ch1mm };
 796         int i;
 797
 798         pci_read_config_word(pdev, I5100_TOLM, &w);
 799         priv->tolm = (u64) i5100_tolm_tolm(w) * 256 * 1024 * 1024;
 800
 801         pci_read_config_word(pdev, I5100_MIR0, &w);
 802         priv->mir[0].limit = (u64) i5100_mir_limit(w) << 28;
 803         priv->mir[0].way[1] = i5100_mir_way1(w);
 804         priv->mir[0].way[0] = i5100_mir_way0(w);
 805
 806         pci_read_config_word(pdev, I5100_MIR1, &w);
 807         priv->mir[1].limit = (u64) i5100_mir_limit(w) << 28;
 808         priv->mir[1].way[1] = i5100_mir_way1(w);
 809         priv->mir[1].way[0] = i5100_mir_way0(w);
 810
 811         pci_read_config_word(pdev, I5100_AMIR_0, &w);
 812         priv->amir[0] = w;
 813         pci_read_config_word(pdev, I5100_AMIR_1, &w);
 814         priv->amir[1] = w;
 815
 816         for (i = 0; i < I5100_CHANNELS; i++) {
 817                 int j;
 818
 819                 for (j = 0; j < 5; j++) {
 820                         int k;
 821
 822                         pci_read_config_dword(mms[i], I5100_DMIR + j * 4, &dw);
 823
 824                         priv->dmir[i][j].limit =
 825                                 (u64) i5100_dmir_limit(dw) << 28;
 826                         for (k = 0; k < I5100_MAX_RANKS_PER_DIMM; k++)
 827                                 priv->dmir[i][j].rank[k] =
 828                                         i5100_dmir_rank(dw, k);
 829                 }
 830         }
 831
 832         i5100_init_mtr(mci);
 833 }
 834
 835 static void i5100_init_csrows(struct mem_ctl_info *mci)
 836 {
 837         struct i5100_priv *priv = mci->pvt_info;
 838         struct dimm_info *dimm;
 839
 840         mci_for_each_dimm(mci, dimm) {
 841                 const unsigned long npages = i5100_npages(mci, dimm->idx);
 842                 const unsigned int chan = i5100_csrow_to_chan(mci, dimm->idx);
 843                 const unsigned int rank = i5100_csrow_to_rank(mci, dimm->idx);
 844
 845                 if (!npages)
 846                         continue;
 847
 848                 dimm->nr_pages = npages;
 849                 dimm->grain = 32;
 850                 dimm->dtype = (priv->mtr[chan][rank].width == 4) ?
 851                                 DEV_X4 : DEV_X8;
 852                 dimm->mtype = MEM_RDDR2;
 853                 dimm->edac_mode = EDAC_SECDED;
 854                 snprintf(dimm->label, sizeof(dimm->label), "DIMM%u",
 855                          i5100_rank_to_slot(mci, chan, rank));
 856
 857                 edac_dbg(2, "dimm channel %d, rank %d, size %ld\n",
 858                          chan, rank, (long)PAGES_TO_MiB(npages));
 859         }
 860 }
 861
 862 /****************************************************************************
 863  *                       Error injection routines
 864  ****************************************************************************/
 865
 866 static void i5100_do_inject(struct mem_ctl_info *mci)
 867 {
 868         struct i5100_priv *priv = mci->pvt_info;
 869         u32 mask0;
 870         u16 mask1;
 871
 872         /* MEM[1:0]EINJMSK0
 873          * 31    - ADDRMATCHEN
 874          * 29:28 - HLINESEL
 875          *         00 Reserved
 876          *         01 Lower half of cache line
 877          *         10 Upper half of cache line
 878          *         11 Both upper and lower parts of cache line
 879          * 27    - EINJEN
 880          * 25:19 - XORMASK1 for deviceptr1
 881          * 9:5   - SEC2RAM for deviceptr2
 882          * 4:0   - FIR2RAM for deviceptr1
 883          */
 884         mask0 = ((priv->inject_hlinesel & 0x3) << 28) |
 885                 I5100_MEMXEINJMSK0_EINJEN |
 886                 ((priv->inject_eccmask1 & 0xffff) << 10) |
 887                 ((priv->inject_deviceptr2 & 0x1f) << 5) |
 888                 (priv->inject_deviceptr1 & 0x1f);
 889
 890         /* MEM[1:0]EINJMSK1
 891          * 15:0  - XORMASK2 for deviceptr2
 892          */
 893         mask1 = priv->inject_eccmask2;
 894
 895         if (priv->inject_channel == 0) {
 896                 pci_write_config_dword(priv->mc, I5100_MEM0EINJMSK0, mask0);
 897                 pci_write_config_word(priv->mc, I5100_MEM0EINJMSK1, mask1);
 898         } else {
 899                 pci_write_config_dword(priv->mc, I5100_MEM1EINJMSK0, mask0);
 900                 pci_write_config_word(priv->mc, I5100_MEM1EINJMSK1, mask1);
 901         }
 902
 903         /* Error Injection Response Function
 904          * Intel 5100 Memory Controller Hub Chipset (318378) datasheet
 905          * hints about this register but carry no data about them. All
 906          * data regarding device 19 is based on experimentation and the
 907          * Intel 7300 Chipset Memory Controller Hub (318082) datasheet
 908          * which appears to be accurate for the i5100 in this area.
 909          *
 910          * The injection code don't work without setting this register.
 911          * The register needs to be flipped off then on else the hardware
 912          * will only preform the first injection.
 913          *
 914          * Stop condition bits 7:4
 915          * 1010 - Stop after one injection
 916          * 1011 - Never stop injecting faults
 917          *
 918          * Start condition bits 3:0
 919          * 1010 - Never start
 920          * 1011 - Start immediately
 921          */
 922         pci_write_config_byte(priv->einj, I5100_DINJ0, 0xaa);
 923         pci_write_config_byte(priv->einj, I5100_DINJ0, 0xab);
 924 }
 925
 926 #define to_mci(k) container_of(k, struct mem_ctl_info, dev)
 927 static ssize_t inject_enable_write(struct file *file, const char __user *data,
 928                 size_t count, loff_t *ppos)
 929 {
 930         struct device *dev = file->private_data;
 931         struct mem_ctl_info *mci = to_mci(dev);
 932
 933         i5100_do_inject(mci);
 934
 935         return count;
 936 }
 937
 938 static const struct file_operations i5100_inject_enable_fops = {
 939         .open = simple_open,
 940         .write = inject_enable_write,
 941         .llseek = generic_file_llseek,
 942 };
 943
 944 static int i5100_setup_debugfs(struct mem_ctl_info *mci)
 945 {
 946         struct i5100_priv *priv = mci->pvt_info;
 947
 948         if (!i5100_debugfs)
 949                 return -ENODEV;
 950
 951         priv->debugfs = edac_debugfs_create_dir_at(mci->bus->name, i5100_debugfs);
 952
 953         if (!priv->debugfs)
 954                 return -ENOMEM;
 955
 956         edac_debugfs_create_x8("inject_channel", S_IRUGO | S_IWUSR, priv->debugfs,
 957                                 &priv->inject_channel);
 958         edac_debugfs_create_x8("inject_hlinesel", S_IRUGO | S_IWUSR, priv->debugfs,
 959                                 &priv->inject_hlinesel);
 960         edac_debugfs_create_x8("inject_deviceptr1", S_IRUGO | S_IWUSR, priv->debugfs,
 961                                 &priv->inject_deviceptr1);
 962         edac_debugfs_create_x8("inject_deviceptr2", S_IRUGO | S_IWUSR, priv->debugfs,
 963                                 &priv->inject_deviceptr2);
 964         edac_debugfs_create_x16("inject_eccmask1", S_IRUGO | S_IWUSR, priv->debugfs,
 965                                 &priv->inject_eccmask1);
 966         edac_debugfs_create_x16("inject_eccmask2", S_IRUGO | S_IWUSR, priv->debugfs,
 967                                 &priv->inject_eccmask2);
 968         edac_debugfs_create_file("inject_enable", S_IWUSR, priv->debugfs,
 969                                 &mci->dev, &i5100_inject_enable_fops);
 970
 971         return 0;
 972
 973 }
 974
 975 static int i5100_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 976 {
 977         int rc;
 978         struct mem_ctl_info *mci;
 979         struct edac_mc_layer layers[2];
 980         struct i5100_priv *priv;
 981         struct pci_dev *ch0mm, *ch1mm, *einj;
 982         int ret = 0;
 983         u32 dw;
 984         int ranksperch;
 985
 986         if (PCI_FUNC(pdev->devfn) != 1)
 987                 return -ENODEV;
 988
 989         rc = pci_enable_device(pdev);
 990         if (rc < 0) {
 991                 ret = rc;
 992                 goto bail;
 993         }
 994
 995         /* ECC enabled? */
 996         pci_read_config_dword(pdev, I5100_MC, &dw);
 997         if (!i5100_mc_errdeten(dw)) {
 998                 printk(KERN_INFO "i5100_edac: ECC not enabled.\n");
 999                 ret = -ENODEV;
1000                 goto bail_pdev;
1001         }
1002
1003         /* figure out how many ranks, from strapped state of 48GB_Mode input */
1004         pci_read_config_dword(pdev, I5100_MS, &dw);
1005         ranksperch = !!(dw & (1 << 8)) * 2 + 4;
1006
1007         /* enable error reporting... */
1008         pci_read_config_dword(pdev, I5100_EMASK_MEM, &dw);
1009         dw &= ~I5100_FERR_NF_MEM_ANY_MASK;
1010         pci_write_config_dword(pdev, I5100_EMASK_MEM, dw);
1011
1012         /* device 21, func 0, Channel 0 Memory Map, Error Flag/Mask, etc... */
1013         ch0mm = pci_get_device_func(PCI_VENDOR_ID_INTEL,
1014                                     PCI_DEVICE_ID_INTEL_5100_21, 0);
1015         if (!ch0mm) {
1016                 ret = -ENODEV;
1017                 goto bail_pdev;
1018         }
1019
1020         rc = pci_enable_device(ch0mm);
1021         if (rc < 0) {
1022                 ret = rc;
1023                 goto bail_ch0;
1024         }
1025
1026         /* device 22, func 0, Channel 1 Memory Map, Error Flag/Mask, etc... */
1027         ch1mm = pci_get_device_func(PCI_VENDOR_ID_INTEL,
1028                                     PCI_DEVICE_ID_INTEL_5100_22, 0);
1029         if (!ch1mm) {
1030                 ret = -ENODEV;
1031                 goto bail_disable_ch0;
1032         }
1033
1034         rc = pci_enable_device(ch1mm);
1035         if (rc < 0) {
1036                 ret = rc;
1037                 goto bail_ch1;
1038         }
1039
1040         layers[0].type = EDAC_MC_LAYER_CHANNEL;
1041         layers[0].size = 2;
1042         layers[0].is_virt_csrow = false;
1043         layers[1].type = EDAC_MC_LAYER_SLOT;
1044         layers[1].size = ranksperch;
1045         layers[1].is_virt_csrow = true;
1046         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
1047                             sizeof(*priv));
1048         if (!mci) {
1049                 ret = -ENOMEM;
1050                 goto bail_disable_ch1;
1051         }
1052
1053
1054         /* device 19, func 0, Error injection */
1055         einj = pci_get_device_func(PCI_VENDOR_ID_INTEL,
1056                                     PCI_DEVICE_ID_INTEL_5100_19, 0);
1057         if (!einj) {
1058                 ret = -ENODEV;
1059                 goto bail_mc_free;
1060         }
1061
1062         rc = pci_enable_device(einj);
1063         if (rc < 0) {
1064                 ret = rc;
1065                 goto bail_einj;
1066         }
1067
1068         mci->pdev = &pdev->dev;
1069
1070         priv = mci->pvt_info;
1071         priv->ranksperchan = ranksperch;
1072         priv->mc = pdev;
1073         priv->ch0mm = ch0mm;
1074         priv->ch1mm = ch1mm;
1075         priv->einj = einj;
1076
1077         INIT_DELAYED_WORK(&(priv->i5100_scrubbing), i5100_refresh_scrubbing);
1078
1079         /* If scrubbing was already enabled by the bios, start maintaining it */
1080         pci_read_config_dword(pdev, I5100_MC, &dw);
1081         if (i5100_mc_scrben(dw)) {
1082                 priv->scrub_enable = 1;
1083                 schedule_delayed_work(&(priv->i5100_scrubbing),
1084                                       I5100_SCRUB_REFRESH_RATE);
1085         }
1086
1087         i5100_init_dimm_layout(pdev, mci);
1088         i5100_init_interleaving(pdev, mci);
1089
1090         mci->mtype_cap = MEM_FLAG_FB_DDR2;
1091         mci->edac_ctl_cap = EDAC_FLAG_SECDED;
1092         mci->edac_cap = EDAC_FLAG_SECDED;
1093         mci->mod_name = "i5100_edac.c";
1094         mci->ctl_name = "i5100";
1095         mci->dev_name = pci_name(pdev);
1096         mci->ctl_page_to_phys = NULL;
1097
1098         mci->edac_check = i5100_check_error;
1099         mci->set_sdram_scrub_rate = i5100_set_scrub_rate;
1100         mci->get_sdram_scrub_rate = i5100_get_scrub_rate;
1101
1102         priv->inject_channel = 0;
1103         priv->inject_hlinesel = 0;
1104         priv->inject_deviceptr1 = 0;
1105         priv->inject_deviceptr2 = 0;
1106         priv->inject_eccmask1 = 0;
1107         priv->inject_eccmask2 = 0;
1108
1109         i5100_init_csrows(mci);
1110
1111         /* this strange construction seems to be in every driver, dunno why */
1112         switch (edac_op_state) {
1113         case EDAC_OPSTATE_POLL:
1114         case EDAC_OPSTATE_NMI:
1115                 break;
1116         default:
1117                 edac_op_state = EDAC_OPSTATE_POLL;
1118                 break;
1119         }
1120
1121         if (edac_mc_add_mc(mci)) {
1122                 ret = -ENODEV;
1123                 goto bail_scrub;
1124         }
1125
1126         i5100_setup_debugfs(mci);
1127
1128         return ret;
1129
1130 bail_scrub:
1131         priv->scrub_enable = 0;
1132         cancel_delayed_work_sync(&(priv->i5100_scrubbing));
1133         pci_disable_device(einj);
1134
1135 bail_einj:
1136         pci_dev_put(einj);
1137
1138 bail_mc_free:
1139         edac_mc_free(mci);
1140
1141 bail_disable_ch1:
1142         pci_disable_device(ch1mm);
1143
1144 bail_ch1:
1145         pci_dev_put(ch1mm);
1146
1147 bail_disable_ch0:
1148         pci_disable_device(ch0mm);
1149
1150 bail_ch0:
1151         pci_dev_put(ch0mm);
1152
1153 bail_pdev:
1154         pci_disable_device(pdev);
1155
1156 bail:
1157         return ret;
1158 }
1159
1160 static void i5100_remove_one(struct pci_dev *pdev)
1161 {
1162         struct mem_ctl_info *mci;
1163         struct i5100_priv *priv;
1164
1165         mci = edac_mc_del_mc(&pdev->dev);
1166
1167         if (!mci)
1168                 return;
1169
1170         priv = mci->pvt_info;
1171
1172         edac_debugfs_remove_recursive(priv->debugfs);
1173
1174         priv->scrub_enable = 0;
1175         cancel_delayed_work_sync(&(priv->i5100_scrubbing));
1176
1177         pci_disable_device(pdev);
1178         pci_disable_device(priv->ch0mm);
1179         pci_disable_device(priv->ch1mm);
1180         pci_disable_device(priv->einj);
1181         pci_dev_put(priv->ch0mm);
1182         pci_dev_put(priv->ch1mm);
1183         pci_dev_put(priv->einj);
1184
1185         edac_mc_free(mci);
1186 }
1187
1188 static const struct pci_device_id i5100_pci_tbl[] = {
1189         /* Device 16, Function 0, Channel 0 Memory Map, Error Flag/Mask, ... */
1190         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5100_16) },
1191         { 0, }
1192 };
1193 MODULE_DEVICE_TABLE(pci, i5100_pci_tbl);
1194
1195 static struct pci_driver i5100_driver = {
1196         .name = KBUILD_BASENAME,
1197         .probe = i5100_init_one,
1198         .remove = i5100_remove_one,
1199         .id_table = i5100_pci_tbl,
1200 };
1201
1202 static int __init i5100_init(void)
1203 {
1204         int pci_rc;
1205
1206         i5100_debugfs = edac_debugfs_create_dir_at("i5100_edac", NULL);
1207
1208         pci_rc = pci_register_driver(&i5100_driver);
1209         return (pci_rc < 0) ? pci_rc : 0;
1210 }
1211
1212 static void __exit i5100_exit(void)
1213 {
1214         edac_debugfs_remove(i5100_debugfs);
1215
1216         pci_unregister_driver(&i5100_driver);
1217 }
1218
1219 module_init(i5100_init);
1220 module_exit(i5100_exit);
1221
1222 MODULE_LICENSE("GPL");
1223 MODULE_AUTHOR
1224     ("Arthur Jones <ajones@riverbed.com>");
1225 MODULE_DESCRIPTION("MC Driver for Intel I5100 memory controllers");