linux/drivers/edac/i7300_edac.c
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   1/*
   2 * Intel 7300 class Memory Controllers kernel module (Clarksboro)
   3 *
   4 * This file may be distributed under the terms of the
   5 * GNU General Public License version 2 only.
   6 *
   7 * Copyright (c) 2010 by:
   8 *       Mauro Carvalho Chehab <mchehab@redhat.com>
   9 *
  10 * Red Hat Inc. http://www.redhat.com
  11 *
  12 * Intel 7300 Chipset Memory Controller Hub (MCH) - Datasheet
  13 *      http://www.intel.com/Assets/PDF/datasheet/318082.pdf
  14 *
  15 * TODO: The chipset allow checking for PCI Express errors also. Currently,
  16 *       the driver covers only memory error errors
  17 *
  18 * This driver uses "csrows" EDAC attribute to represent DIMM slot#
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/init.h>
  23#include <linux/pci.h>
  24#include <linux/pci_ids.h>
  25#include <linux/slab.h>
  26#include <linux/edac.h>
  27#include <linux/mmzone.h>
  28
  29#include "edac_core.h"
  30
  31/*
  32 * Alter this version for the I7300 module when modifications are made
  33 */
  34#define I7300_REVISION    " Ver: 1.0.0"
  35
  36#define EDAC_MOD_STR      "i7300_edac"
  37
  38#define i7300_printk(level, fmt, arg...) \
  39        edac_printk(level, "i7300", fmt, ##arg)
  40
  41#define i7300_mc_printk(mci, level, fmt, arg...) \
  42        edac_mc_chipset_printk(mci, level, "i7300", fmt, ##arg)
  43
  44/***********************************************
  45 * i7300 Limit constants Structs and static vars
  46 ***********************************************/
  47
  48/*
  49 * Memory topology is organized as:
  50 *      Branch 0 - 2 channels: channels 0 and 1 (FDB0 PCI dev 21.0)
  51 *      Branch 1 - 2 channels: channels 2 and 3 (FDB1 PCI dev 22.0)
  52 * Each channel can have to 8 DIMM sets (called as SLOTS)
  53 * Slots should generally be filled in pairs
  54 *      Except on Single Channel mode of operation
  55 *              just slot 0/channel0 filled on this mode
  56 *      On normal operation mode, the two channels on a branch should be
  57 *              filled together for the same SLOT#
  58 * When in mirrored mode, Branch 1 replicate memory at Branch 0, so, the four
  59 *              channels on both branches should be filled
  60 */
  61
  62/* Limits for i7300 */
  63#define MAX_SLOTS               8
  64#define MAX_BRANCHES            2
  65#define MAX_CH_PER_BRANCH       2
  66#define MAX_CHANNELS            (MAX_CH_PER_BRANCH * MAX_BRANCHES)
  67#define MAX_MIR                 3
  68
  69#define to_channel(ch, branch)  ((((branch)) << 1) | (ch))
  70
  71#define to_csrow(slot, ch, branch)                                      \
  72                (to_channel(ch, branch) | ((slot) << 2))
  73
  74/* Device name and register DID (Device ID) */
  75struct i7300_dev_info {
  76        const char *ctl_name;   /* name for this device */
  77        u16 fsb_mapping_errors; /* DID for the branchmap,control */
  78};
  79
  80/* Table of devices attributes supported by this driver */
  81static const struct i7300_dev_info i7300_devs[] = {
  82        {
  83                .ctl_name = "I7300",
  84                .fsb_mapping_errors = PCI_DEVICE_ID_INTEL_I7300_MCH_ERR,
  85        },
  86};
  87
  88struct i7300_dimm_info {
  89        int megabytes;          /* size, 0 means not present  */
  90};
  91
  92/* driver private data structure */
  93struct i7300_pvt {
  94        struct pci_dev *pci_dev_16_0_fsb_ctlr;          /* 16.0 */
  95        struct pci_dev *pci_dev_16_1_fsb_addr_map;      /* 16.1 */
  96        struct pci_dev *pci_dev_16_2_fsb_err_regs;      /* 16.2 */
  97        struct pci_dev *pci_dev_2x_0_fbd_branch[MAX_BRANCHES];  /* 21.0  and 22.0 */
  98
  99        u16 tolm;                               /* top of low memory */
 100        u64 ambase;                             /* AMB BAR */
 101
 102        u32 mc_settings;                        /* Report several settings */
 103        u32 mc_settings_a;
 104
 105        u16 mir[MAX_MIR];                       /* Memory Interleave Reg*/
 106
 107        u16 mtr[MAX_SLOTS][MAX_BRANCHES];       /* Memory Technlogy Reg */
 108        u16 ambpresent[MAX_CHANNELS];           /* AMB present regs */
 109
 110        /* DIMM information matrix, allocating architecture maximums */
 111        struct i7300_dimm_info dimm_info[MAX_SLOTS][MAX_CHANNELS];
 112
 113        /* Temporary buffer for use when preparing error messages */
 114        char *tmp_prt_buffer;
 115};
 116
 117/* FIXME: Why do we need to have this static? */
 118static struct edac_pci_ctl_info *i7300_pci;
 119
 120/***************************************************
 121 * i7300 Register definitions for memory enumeration
 122 ***************************************************/
 123
 124/*
 125 * Device 16,
 126 * Function 0: System Address (not documented)
 127 * Function 1: Memory Branch Map, Control, Errors Register
 128 */
 129
 130        /* OFFSETS for Function 0 */
 131#define AMBASE                  0x48 /* AMB Mem Mapped Reg Region Base */
 132#define MAXCH                   0x56 /* Max Channel Number */
 133#define MAXDIMMPERCH            0x57 /* Max DIMM PER Channel Number */
 134
 135        /* OFFSETS for Function 1 */
 136#define MC_SETTINGS             0x40
 137  #define IS_MIRRORED(mc)               ((mc) & (1 << 16))
 138  #define IS_ECC_ENABLED(mc)            ((mc) & (1 << 5))
 139  #define IS_RETRY_ENABLED(mc)          ((mc) & (1 << 31))
 140  #define IS_SCRBALGO_ENHANCED(mc)      ((mc) & (1 << 8))
 141
 142#define MC_SETTINGS_A           0x58
 143  #define IS_SINGLE_MODE(mca)           ((mca) & (1 << 14))
 144
 145#define TOLM                    0x6C
 146
 147#define MIR0                    0x80
 148#define MIR1                    0x84
 149#define MIR2                    0x88
 150
 151/*
 152 * Note: Other Intel EDAC drivers use AMBPRESENT to identify if the available
 153 * memory. From datasheet item 7.3.1 (FB-DIMM technology & organization), it
 154 * seems that we cannot use this information directly for the same usage.
 155 * Each memory slot may have up to 2 AMB interfaces, one for income and another
 156 * for outcome interface to the next slot.
 157 * For now, the driver just stores the AMB present registers, but rely only at
 158 * the MTR info to detect memory.
 159 * Datasheet is also not clear about how to map each AMBPRESENT registers to
 160 * one of the 4 available channels.
 161 */
 162#define AMBPRESENT_0    0x64
 163#define AMBPRESENT_1    0x66
 164
 165static const u16 mtr_regs[MAX_SLOTS] = {
 166        0x80, 0x84, 0x88, 0x8c,
 167        0x82, 0x86, 0x8a, 0x8e
 168};
 169
 170/*
 171 * Defines to extract the vaious fields from the
 172 *      MTRx - Memory Technology Registers
 173 */
 174#define MTR_DIMMS_PRESENT(mtr)          ((mtr) & (1 << 8))
 175#define MTR_DIMMS_ETHROTTLE(mtr)        ((mtr) & (1 << 7))
 176#define MTR_DRAM_WIDTH(mtr)             (((mtr) & (1 << 6)) ? 8 : 4)
 177#define MTR_DRAM_BANKS(mtr)             (((mtr) & (1 << 5)) ? 8 : 4)
 178#define MTR_DIMM_RANKS(mtr)             (((mtr) & (1 << 4)) ? 1 : 0)
 179#define MTR_DIMM_ROWS(mtr)              (((mtr) >> 2) & 0x3)
 180#define MTR_DRAM_BANKS_ADDR_BITS        2
 181#define MTR_DIMM_ROWS_ADDR_BITS(mtr)    (MTR_DIMM_ROWS(mtr) + 13)
 182#define MTR_DIMM_COLS(mtr)              ((mtr) & 0x3)
 183#define MTR_DIMM_COLS_ADDR_BITS(mtr)    (MTR_DIMM_COLS(mtr) + 10)
 184
 185/************************************************
 186 * i7300 Register definitions for error detection
 187 ************************************************/
 188
 189/*
 190 * Device 16.1: FBD Error Registers
 191 */
 192#define FERR_FAT_FBD    0x98
 193static const char *ferr_fat_fbd_name[] = {
 194        [22] = "Non-Redundant Fast Reset Timeout",
 195        [2]  = ">Tmid Thermal event with intelligent throttling disabled",
 196        [1]  = "Memory or FBD configuration CRC read error",
 197        [0]  = "Memory Write error on non-redundant retry or "
 198               "FBD configuration Write error on retry",
 199};
 200#define GET_FBD_FAT_IDX(fbderr) (((fbderr) >> 28) & 3)
 201#define FERR_FAT_FBD_ERR_MASK ((1 << 0) | (1 << 1) | (1 << 2) | (1 << 22))
 202
 203#define FERR_NF_FBD     0xa0
 204static const char *ferr_nf_fbd_name[] = {
 205        [24] = "DIMM-Spare Copy Completed",
 206        [23] = "DIMM-Spare Copy Initiated",
 207        [22] = "Redundant Fast Reset Timeout",
 208        [21] = "Memory Write error on redundant retry",
 209        [18] = "SPD protocol Error",
 210        [17] = "FBD Northbound parity error on FBD Sync Status",
 211        [16] = "Correctable Patrol Data ECC",
 212        [15] = "Correctable Resilver- or Spare-Copy Data ECC",
 213        [14] = "Correctable Mirrored Demand Data ECC",
 214        [13] = "Correctable Non-Mirrored Demand Data ECC",
 215        [11] = "Memory or FBD configuration CRC read error",
 216        [10] = "FBD Configuration Write error on first attempt",
 217        [9]  = "Memory Write error on first attempt",
 218        [8]  = "Non-Aliased Uncorrectable Patrol Data ECC",
 219        [7]  = "Non-Aliased Uncorrectable Resilver- or Spare-Copy Data ECC",
 220        [6]  = "Non-Aliased Uncorrectable Mirrored Demand Data ECC",
 221        [5]  = "Non-Aliased Uncorrectable Non-Mirrored Demand Data ECC",
 222        [4]  = "Aliased Uncorrectable Patrol Data ECC",
 223        [3]  = "Aliased Uncorrectable Resilver- or Spare-Copy Data ECC",
 224        [2]  = "Aliased Uncorrectable Mirrored Demand Data ECC",
 225        [1]  = "Aliased Uncorrectable Non-Mirrored Demand Data ECC",
 226        [0]  = "Uncorrectable Data ECC on Replay",
 227};
 228#define GET_FBD_NF_IDX(fbderr)  (((fbderr) >> 28) & 3)
 229#define FERR_NF_FBD_ERR_MASK ((1 << 24) | (1 << 23) | (1 << 22) | (1 << 21) |\
 230                              (1 << 18) | (1 << 17) | (1 << 16) | (1 << 15) |\
 231                              (1 << 14) | (1 << 13) | (1 << 11) | (1 << 10) |\
 232                              (1 << 9)  | (1 << 8)  | (1 << 7)  | (1 << 6)  |\
 233                              (1 << 5)  | (1 << 4)  | (1 << 3)  | (1 << 2)  |\
 234                              (1 << 1)  | (1 << 0))
 235
 236#define EMASK_FBD       0xa8
 237#define EMASK_FBD_ERR_MASK ((1 << 27) | (1 << 26) | (1 << 25) | (1 << 24) |\
 238                            (1 << 22) | (1 << 21) | (1 << 20) | (1 << 19) |\
 239                            (1 << 18) | (1 << 17) | (1 << 16) | (1 << 14) |\
 240                            (1 << 13) | (1 << 12) | (1 << 11) | (1 << 10) |\
 241                            (1 << 9)  | (1 << 8)  | (1 << 7)  | (1 << 6)  |\
 242                            (1 << 5)  | (1 << 4)  | (1 << 3)  | (1 << 2)  |\
 243                            (1 << 1)  | (1 << 0))
 244
 245/*
 246 * Device 16.2: Global Error Registers
 247 */
 248
 249#define FERR_GLOBAL_HI  0x48
 250static const char *ferr_global_hi_name[] = {
 251        [3] = "FSB 3 Fatal Error",
 252        [2] = "FSB 2 Fatal Error",
 253        [1] = "FSB 1 Fatal Error",
 254        [0] = "FSB 0 Fatal Error",
 255};
 256#define ferr_global_hi_is_fatal(errno)  1
 257
 258#define FERR_GLOBAL_LO  0x40
 259static const char *ferr_global_lo_name[] = {
 260        [31] = "Internal MCH Fatal Error",
 261        [30] = "Intel QuickData Technology Device Fatal Error",
 262        [29] = "FSB1 Fatal Error",
 263        [28] = "FSB0 Fatal Error",
 264        [27] = "FBD Channel 3 Fatal Error",
 265        [26] = "FBD Channel 2 Fatal Error",
 266        [25] = "FBD Channel 1 Fatal Error",
 267        [24] = "FBD Channel 0 Fatal Error",
 268        [23] = "PCI Express Device 7Fatal Error",
 269        [22] = "PCI Express Device 6 Fatal Error",
 270        [21] = "PCI Express Device 5 Fatal Error",
 271        [20] = "PCI Express Device 4 Fatal Error",
 272        [19] = "PCI Express Device 3 Fatal Error",
 273        [18] = "PCI Express Device 2 Fatal Error",
 274        [17] = "PCI Express Device 1 Fatal Error",
 275        [16] = "ESI Fatal Error",
 276        [15] = "Internal MCH Non-Fatal Error",
 277        [14] = "Intel QuickData Technology Device Non Fatal Error",
 278        [13] = "FSB1 Non-Fatal Error",
 279        [12] = "FSB 0 Non-Fatal Error",
 280        [11] = "FBD Channel 3 Non-Fatal Error",
 281        [10] = "FBD Channel 2 Non-Fatal Error",
 282        [9]  = "FBD Channel 1 Non-Fatal Error",
 283        [8]  = "FBD Channel 0 Non-Fatal Error",
 284        [7]  = "PCI Express Device 7 Non-Fatal Error",
 285        [6]  = "PCI Express Device 6 Non-Fatal Error",
 286        [5]  = "PCI Express Device 5 Non-Fatal Error",
 287        [4]  = "PCI Express Device 4 Non-Fatal Error",
 288        [3]  = "PCI Express Device 3 Non-Fatal Error",
 289        [2]  = "PCI Express Device 2 Non-Fatal Error",
 290        [1]  = "PCI Express Device 1 Non-Fatal Error",
 291        [0]  = "ESI Non-Fatal Error",
 292};
 293#define ferr_global_lo_is_fatal(errno)  ((errno < 16) ? 0 : 1)
 294
 295#define NRECMEMA        0xbe
 296  #define NRECMEMA_BANK(v)      (((v) >> 12) & 7)
 297  #define NRECMEMA_RANK(v)      (((v) >> 8) & 15)
 298
 299#define NRECMEMB        0xc0
 300  #define NRECMEMB_IS_WR(v)     ((v) & (1 << 31))
 301  #define NRECMEMB_CAS(v)       (((v) >> 16) & 0x1fff)
 302  #define NRECMEMB_RAS(v)       ((v) & 0xffff)
 303
 304#define REDMEMA         0xdc
 305
 306#define REDMEMB         0x7c
 307  #define IS_SECOND_CH(v)       ((v) * (1 << 17))
 308
 309#define RECMEMA         0xe0
 310  #define RECMEMA_BANK(v)       (((v) >> 12) & 7)
 311  #define RECMEMA_RANK(v)       (((v) >> 8) & 15)
 312
 313#define RECMEMB         0xe4
 314  #define RECMEMB_IS_WR(v)      ((v) & (1 << 31))
 315  #define RECMEMB_CAS(v)        (((v) >> 16) & 0x1fff)
 316  #define RECMEMB_RAS(v)        ((v) & 0xffff)
 317
 318/********************************************
 319 * i7300 Functions related to error detection
 320 ********************************************/
 321
 322/**
 323 * get_err_from_table() - Gets the error message from a table
 324 * @table:      table name (array of char *)
 325 * @size:       number of elements at the table
 326 * @pos:        position of the element to be returned
 327 *
 328 * This is a small routine that gets the pos-th element of a table. If the
 329 * element doesn't exist (or it is empty), it returns "reserved".
 330 * Instead of calling it directly, the better is to call via the macro
 331 * GET_ERR_FROM_TABLE(), that automatically checks the table size via
 332 * ARRAY_SIZE() macro
 333 */
 334static const char *get_err_from_table(const char *table[], int size, int pos)
 335{
 336        if (unlikely(pos >= size))
 337                return "Reserved";
 338
 339        if (unlikely(!table[pos]))
 340                return "Reserved";
 341
 342        return table[pos];
 343}
 344
 345#define GET_ERR_FROM_TABLE(table, pos)                          \
 346        get_err_from_table(table, ARRAY_SIZE(table), pos)
 347
 348/**
 349 * i7300_process_error_global() - Retrieve the hardware error information from
 350 *                                the hardware global error registers and
 351 *                                sends it to dmesg
 352 * @mci: struct mem_ctl_info pointer
 353 */
 354static void i7300_process_error_global(struct mem_ctl_info *mci)
 355{
 356        struct i7300_pvt *pvt;
 357        u32 errnum, error_reg;
 358        unsigned long errors;
 359        const char *specific;
 360        bool is_fatal;
 361
 362        pvt = mci->pvt_info;
 363
 364        /* read in the 1st FATAL error register */
 365        pci_read_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 366                              FERR_GLOBAL_HI, &error_reg);
 367        if (unlikely(error_reg)) {
 368                errors = error_reg;
 369                errnum = find_first_bit(&errors,
 370                                        ARRAY_SIZE(ferr_global_hi_name));
 371                specific = GET_ERR_FROM_TABLE(ferr_global_hi_name, errnum);
 372                is_fatal = ferr_global_hi_is_fatal(errnum);
 373
 374                /* Clear the error bit */
 375                pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 376                                       FERR_GLOBAL_HI, error_reg);
 377
 378                goto error_global;
 379        }
 380
 381        pci_read_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 382                              FERR_GLOBAL_LO, &error_reg);
 383        if (unlikely(error_reg)) {
 384                errors = error_reg;
 385                errnum = find_first_bit(&errors,
 386                                        ARRAY_SIZE(ferr_global_lo_name));
 387                specific = GET_ERR_FROM_TABLE(ferr_global_lo_name, errnum);
 388                is_fatal = ferr_global_lo_is_fatal(errnum);
 389
 390                /* Clear the error bit */
 391                pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 392                                       FERR_GLOBAL_LO, error_reg);
 393
 394                goto error_global;
 395        }
 396        return;
 397
 398error_global:
 399        i7300_mc_printk(mci, KERN_EMERG, "%s misc error: %s\n",
 400                        is_fatal ? "Fatal" : "NOT fatal", specific);
 401}
 402
 403/**
 404 * i7300_process_fbd_error() - Retrieve the hardware error information from
 405 *                             the FBD error registers and sends it via
 406 *                             EDAC error API calls
 407 * @mci: struct mem_ctl_info pointer
 408 */
 409static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 410{
 411        struct i7300_pvt *pvt;
 412        u32 errnum, value, error_reg;
 413        u16 val16;
 414        unsigned branch, channel, bank, rank, cas, ras;
 415        u32 syndrome;
 416
 417        unsigned long errors;
 418        const char *specific;
 419        bool is_wr;
 420
 421        pvt = mci->pvt_info;
 422
 423        /* read in the 1st FATAL error register */
 424        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 425                              FERR_FAT_FBD, &error_reg);
 426        if (unlikely(error_reg & FERR_FAT_FBD_ERR_MASK)) {
 427                errors = error_reg & FERR_FAT_FBD_ERR_MASK ;
 428                errnum = find_first_bit(&errors,
 429                                        ARRAY_SIZE(ferr_fat_fbd_name));
 430                specific = GET_ERR_FROM_TABLE(ferr_fat_fbd_name, errnum);
 431                branch = (GET_FBD_FAT_IDX(error_reg) == 2) ? 1 : 0;
 432
 433                pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map,
 434                                     NRECMEMA, &val16);
 435                bank = NRECMEMA_BANK(val16);
 436                rank = NRECMEMA_RANK(val16);
 437
 438                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 439                                NRECMEMB, &value);
 440                is_wr = NRECMEMB_IS_WR(value);
 441                cas = NRECMEMB_CAS(value);
 442                ras = NRECMEMB_RAS(value);
 443
 444                /* Clean the error register */
 445                pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 446                                FERR_FAT_FBD, error_reg);
 447
 448                snprintf(pvt->tmp_prt_buffer, PAGE_SIZE,
 449                         "Bank=%d RAS=%d CAS=%d Err=0x%lx (%s))",
 450                         bank, ras, cas, errors, specific);
 451
 452                edac_mc_handle_error(HW_EVENT_ERR_FATAL, mci, 1, 0, 0, 0,
 453                                     branch, -1, rank,
 454                                     is_wr ? "Write error" : "Read error",
 455                                     pvt->tmp_prt_buffer);
 456
 457        }
 458
 459        /* read in the 1st NON-FATAL error register */
 460        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 461                              FERR_NF_FBD, &error_reg);
 462        if (unlikely(error_reg & FERR_NF_FBD_ERR_MASK)) {
 463                errors = error_reg & FERR_NF_FBD_ERR_MASK;
 464                errnum = find_first_bit(&errors,
 465                                        ARRAY_SIZE(ferr_nf_fbd_name));
 466                specific = GET_ERR_FROM_TABLE(ferr_nf_fbd_name, errnum);
 467                branch = (GET_FBD_NF_IDX(error_reg) == 2) ? 1 : 0;
 468
 469                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 470                        REDMEMA, &syndrome);
 471
 472                pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map,
 473                                     RECMEMA, &val16);
 474                bank = RECMEMA_BANK(val16);
 475                rank = RECMEMA_RANK(val16);
 476
 477                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 478                                RECMEMB, &value);
 479                is_wr = RECMEMB_IS_WR(value);
 480                cas = RECMEMB_CAS(value);
 481                ras = RECMEMB_RAS(value);
 482
 483                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 484                                     REDMEMB, &value);
 485                channel = (branch << 1);
 486                if (IS_SECOND_CH(value))
 487                        channel++;
 488
 489                /* Clear the error bit */
 490                pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 491                                FERR_NF_FBD, error_reg);
 492
 493                /* Form out message */
 494                snprintf(pvt->tmp_prt_buffer, PAGE_SIZE,
 495                         "DRAM-Bank=%d RAS=%d CAS=%d, Err=0x%lx (%s))",
 496                         bank, ras, cas, errors, specific);
 497
 498                edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1, 0, 0,
 499                                     syndrome,
 500                                     branch >> 1, channel % 2, rank,
 501                                     is_wr ? "Write error" : "Read error",
 502                                     pvt->tmp_prt_buffer);
 503        }
 504        return;
 505}
 506
 507/**
 508 * i7300_check_error() - Calls the error checking subroutines
 509 * @mci: struct mem_ctl_info pointer
 510 */
 511static void i7300_check_error(struct mem_ctl_info *mci)
 512{
 513        i7300_process_error_global(mci);
 514        i7300_process_fbd_error(mci);
 515};
 516
 517/**
 518 * i7300_clear_error() - Clears the error registers
 519 * @mci: struct mem_ctl_info pointer
 520 */
 521static void i7300_clear_error(struct mem_ctl_info *mci)
 522{
 523        struct i7300_pvt *pvt = mci->pvt_info;
 524        u32 value;
 525        /*
 526         * All error values are RWC - we need to read and write 1 to the
 527         * bit that we want to cleanup
 528         */
 529
 530        /* Clear global error registers */
 531        pci_read_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 532                              FERR_GLOBAL_HI, &value);
 533        pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 534                              FERR_GLOBAL_HI, value);
 535
 536        pci_read_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 537                              FERR_GLOBAL_LO, &value);
 538        pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
 539                              FERR_GLOBAL_LO, value);
 540
 541        /* Clear FBD error registers */
 542        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 543                              FERR_FAT_FBD, &value);
 544        pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 545                              FERR_FAT_FBD, value);
 546
 547        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 548                              FERR_NF_FBD, &value);
 549        pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 550                              FERR_NF_FBD, value);
 551}
 552
 553/**
 554 * i7300_enable_error_reporting() - Enable the memory reporting logic at the
 555 *                                  hardware
 556 * @mci: struct mem_ctl_info pointer
 557 */
 558static void i7300_enable_error_reporting(struct mem_ctl_info *mci)
 559{
 560        struct i7300_pvt *pvt = mci->pvt_info;
 561        u32 fbd_error_mask;
 562
 563        /* Read the FBD Error Mask Register */
 564        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 565                              EMASK_FBD, &fbd_error_mask);
 566
 567        /* Enable with a '0' */
 568        fbd_error_mask &= ~(EMASK_FBD_ERR_MASK);
 569
 570        pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
 571                               EMASK_FBD, fbd_error_mask);
 572}
 573
 574/************************************************
 575 * i7300 Functions related to memory enumberation
 576 ************************************************/
 577
 578/**
 579 * decode_mtr() - Decodes the MTR descriptor, filling the edac structs
 580 * @pvt: pointer to the private data struct used by i7300 driver
 581 * @slot: DIMM slot (0 to 7)
 582 * @ch: Channel number within the branch (0 or 1)
 583 * @branch: Branch number (0 or 1)
 584 * @dinfo: Pointer to DIMM info where dimm size is stored
 585 * @p_csrow: Pointer to the struct csrow_info that corresponds to that element
 586 */
 587static int decode_mtr(struct i7300_pvt *pvt,
 588                      int slot, int ch, int branch,
 589                      struct i7300_dimm_info *dinfo,
 590                      struct dimm_info *dimm)
 591{
 592        int mtr, ans, addrBits, channel;
 593
 594        channel = to_channel(ch, branch);
 595
 596        mtr = pvt->mtr[slot][branch];
 597        ans = MTR_DIMMS_PRESENT(mtr) ? 1 : 0;
 598
 599        edac_dbg(2, "\tMTR%d CH%d: DIMMs are %sPresent (mtr)\n",
 600                 slot, channel, ans ? "" : "NOT ");
 601
 602        /* Determine if there is a DIMM present in this DIMM slot */
 603        if (!ans)
 604                return 0;
 605
 606        /* Start with the number of bits for a Bank
 607        * on the DRAM */
 608        addrBits = MTR_DRAM_BANKS_ADDR_BITS;
 609        /* Add thenumber of ROW bits */
 610        addrBits += MTR_DIMM_ROWS_ADDR_BITS(mtr);
 611        /* add the number of COLUMN bits */
 612        addrBits += MTR_DIMM_COLS_ADDR_BITS(mtr);
 613        /* add the number of RANK bits */
 614        addrBits += MTR_DIMM_RANKS(mtr);
 615
 616        addrBits += 6;  /* add 64 bits per DIMM */
 617        addrBits -= 20; /* divide by 2^^20 */
 618        addrBits -= 3;  /* 8 bits per bytes */
 619
 620        dinfo->megabytes = 1 << addrBits;
 621
 622        edac_dbg(2, "\t\tWIDTH: x%d\n", MTR_DRAM_WIDTH(mtr));
 623
 624        edac_dbg(2, "\t\tELECTRICAL THROTTLING is %s\n",
 625                 MTR_DIMMS_ETHROTTLE(mtr) ? "enabled" : "disabled");
 626
 627        edac_dbg(2, "\t\tNUMBANK: %d bank(s)\n", MTR_DRAM_BANKS(mtr));
 628        edac_dbg(2, "\t\tNUMRANK: %s\n",
 629                 MTR_DIMM_RANKS(mtr) ? "double" : "single");
 630        edac_dbg(2, "\t\tNUMROW: %s\n",
 631                 MTR_DIMM_ROWS(mtr) == 0 ? "8,192 - 13 rows" :
 632                 MTR_DIMM_ROWS(mtr) == 1 ? "16,384 - 14 rows" :
 633                 MTR_DIMM_ROWS(mtr) == 2 ? "32,768 - 15 rows" :
 634                 "65,536 - 16 rows");
 635        edac_dbg(2, "\t\tNUMCOL: %s\n",
 636                 MTR_DIMM_COLS(mtr) == 0 ? "1,024 - 10 columns" :
 637                 MTR_DIMM_COLS(mtr) == 1 ? "2,048 - 11 columns" :
 638                 MTR_DIMM_COLS(mtr) == 2 ? "4,096 - 12 columns" :
 639                 "reserved");
 640        edac_dbg(2, "\t\tSIZE: %d MB\n", dinfo->megabytes);
 641
 642        /*
 643         * The type of error detection actually depends of the
 644         * mode of operation. When it is just one single memory chip, at
 645         * socket 0, channel 0, it uses 8-byte-over-32-byte SECDED+ code.
 646         * In normal or mirrored mode, it uses Lockstep mode,
 647         * with the possibility of using an extended algorithm for x8 memories
 648         * See datasheet Sections 7.3.6 to 7.3.8
 649         */
 650
 651        dimm->nr_pages = MiB_TO_PAGES(dinfo->megabytes);
 652        dimm->grain = 8;
 653        dimm->mtype = MEM_FB_DDR2;
 654        if (IS_SINGLE_MODE(pvt->mc_settings_a)) {
 655                dimm->edac_mode = EDAC_SECDED;
 656                edac_dbg(2, "\t\tECC code is 8-byte-over-32-byte SECDED+ code\n");
 657        } else {
 658                edac_dbg(2, "\t\tECC code is on Lockstep mode\n");
 659                if (MTR_DRAM_WIDTH(mtr) == 8)
 660                        dimm->edac_mode = EDAC_S8ECD8ED;
 661                else
 662                        dimm->edac_mode = EDAC_S4ECD4ED;
 663        }
 664
 665        /* ask what device type on this row */
 666        if (MTR_DRAM_WIDTH(mtr) == 8) {
 667                edac_dbg(2, "\t\tScrub algorithm for x8 is on %s mode\n",
 668                         IS_SCRBALGO_ENHANCED(pvt->mc_settings) ?
 669                         "enhanced" : "normal");
 670
 671                dimm->dtype = DEV_X8;
 672        } else
 673                dimm->dtype = DEV_X4;
 674
 675        return mtr;
 676}
 677
 678/**
 679 * print_dimm_size() - Prints dump of the memory organization
 680 * @pvt: pointer to the private data struct used by i7300 driver
 681 *
 682 * Useful for debug. If debug is disabled, this routine do nothing
 683 */
 684static void print_dimm_size(struct i7300_pvt *pvt)
 685{
 686#ifdef CONFIG_EDAC_DEBUG
 687        struct i7300_dimm_info *dinfo;
 688        char *p;
 689        int space, n;
 690        int channel, slot;
 691
 692        space = PAGE_SIZE;
 693        p = pvt->tmp_prt_buffer;
 694
 695        n = snprintf(p, space, "              ");
 696        p += n;
 697        space -= n;
 698        for (channel = 0; channel < MAX_CHANNELS; channel++) {
 699                n = snprintf(p, space, "channel %d | ", channel);
 700                p += n;
 701                space -= n;
 702        }
 703        edac_dbg(2, "%s\n", pvt->tmp_prt_buffer);
 704        p = pvt->tmp_prt_buffer;
 705        space = PAGE_SIZE;
 706        n = snprintf(p, space, "-------------------------------"
 707                               "------------------------------");
 708        p += n;
 709        space -= n;
 710        edac_dbg(2, "%s\n", pvt->tmp_prt_buffer);
 711        p = pvt->tmp_prt_buffer;
 712        space = PAGE_SIZE;
 713
 714        for (slot = 0; slot < MAX_SLOTS; slot++) {
 715                n = snprintf(p, space, "csrow/SLOT %d  ", slot);
 716                p += n;
 717                space -= n;
 718
 719                for (channel = 0; channel < MAX_CHANNELS; channel++) {
 720                        dinfo = &pvt->dimm_info[slot][channel];
 721                        n = snprintf(p, space, "%4d MB   | ", dinfo->megabytes);
 722                        p += n;
 723                        space -= n;
 724                }
 725
 726                edac_dbg(2, "%s\n", pvt->tmp_prt_buffer);
 727                p = pvt->tmp_prt_buffer;
 728                space = PAGE_SIZE;
 729        }
 730
 731        n = snprintf(p, space, "-------------------------------"
 732                               "------------------------------");
 733        p += n;
 734        space -= n;
 735        edac_dbg(2, "%s\n", pvt->tmp_prt_buffer);
 736        p = pvt->tmp_prt_buffer;
 737        space = PAGE_SIZE;
 738#endif
 739}
 740
 741/**
 742 * i7300_init_csrows() - Initialize the 'csrows' table within
 743 *                       the mci control structure with the
 744 *                       addressing of memory.
 745 * @mci: struct mem_ctl_info pointer
 746 */
 747static int i7300_init_csrows(struct mem_ctl_info *mci)
 748{
 749        struct i7300_pvt *pvt;
 750        struct i7300_dimm_info *dinfo;
 751        int rc = -ENODEV;
 752        int mtr;
 753        int ch, branch, slot, channel, max_channel, max_branch;
 754        struct dimm_info *dimm;
 755
 756        pvt = mci->pvt_info;
 757
 758        edac_dbg(2, "Memory Technology Registers:\n");
 759
 760        if (IS_SINGLE_MODE(pvt->mc_settings_a)) {
 761                max_branch = 1;
 762                max_channel = 1;
 763        } else {
 764                max_branch = MAX_BRANCHES;
 765                max_channel = MAX_CH_PER_BRANCH;
 766        }
 767
 768        /* Get the AMB present registers for the four channels */
 769        for (branch = 0; branch < max_branch; branch++) {
 770                /* Read and dump branch 0's MTRs */
 771                channel = to_channel(0, branch);
 772                pci_read_config_word(pvt->pci_dev_2x_0_fbd_branch[branch],
 773                                     AMBPRESENT_0,
 774                                &pvt->ambpresent[channel]);
 775                edac_dbg(2, "\t\tAMB-present CH%d = 0x%x:\n",
 776                         channel, pvt->ambpresent[channel]);
 777
 778                if (max_channel == 1)
 779                        continue;
 780
 781                channel = to_channel(1, branch);
 782                pci_read_config_word(pvt->pci_dev_2x_0_fbd_branch[branch],
 783                                     AMBPRESENT_1,
 784                                &pvt->ambpresent[channel]);
 785                edac_dbg(2, "\t\tAMB-present CH%d = 0x%x:\n",
 786                         channel, pvt->ambpresent[channel]);
 787        }
 788
 789        /* Get the set of MTR[0-7] regs by each branch */
 790        for (slot = 0; slot < MAX_SLOTS; slot++) {
 791                int where = mtr_regs[slot];
 792                for (branch = 0; branch < max_branch; branch++) {
 793                        pci_read_config_word(pvt->pci_dev_2x_0_fbd_branch[branch],
 794                                        where,
 795                                        &pvt->mtr[slot][branch]);
 796                        for (ch = 0; ch < max_channel; ch++) {
 797                                int channel = to_channel(ch, branch);
 798
 799                                dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
 800                                               mci->n_layers, branch, ch, slot);
 801
 802                                dinfo = &pvt->dimm_info[slot][channel];
 803
 804                                mtr = decode_mtr(pvt, slot, ch, branch,
 805                                                 dinfo, dimm);
 806
 807                                /* if no DIMMS on this row, continue */
 808                                if (!MTR_DIMMS_PRESENT(mtr))
 809                                        continue;
 810
 811                                rc = 0;
 812
 813                        }
 814                }
 815        }
 816
 817        return rc;
 818}
 819
 820/**
 821 * decode_mir() - Decodes Memory Interleave Register (MIR) info
 822 * @int mir_no: number of the MIR register to decode
 823 * @mir: array with the MIR data cached on the driver
 824 */
 825static void decode_mir(int mir_no, u16 mir[MAX_MIR])
 826{
 827        if (mir[mir_no] & 3)
 828                edac_dbg(2, "MIR%d: limit= 0x%x Branch(es) that participate: %s %s\n",
 829                         mir_no,
 830                         (mir[mir_no] >> 4) & 0xfff,
 831                         (mir[mir_no] & 1) ? "B0" : "",
 832                         (mir[mir_no] & 2) ? "B1" : "");
 833}
 834
 835/**
 836 * i7300_get_mc_regs() - Get the contents of the MC enumeration registers
 837 * @mci: struct mem_ctl_info pointer
 838 *
 839 * Data read is cached internally for its usage when needed
 840 */
 841static int i7300_get_mc_regs(struct mem_ctl_info *mci)
 842{
 843        struct i7300_pvt *pvt;
 844        u32 actual_tolm;
 845        int i, rc;
 846
 847        pvt = mci->pvt_info;
 848
 849        pci_read_config_dword(pvt->pci_dev_16_0_fsb_ctlr, AMBASE,
 850                        (u32 *) &pvt->ambase);
 851
 852        edac_dbg(2, "AMBASE= 0x%lx\n", (long unsigned int)pvt->ambase);
 853
 854        /* Get the Branch Map regs */
 855        pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map, TOLM, &pvt->tolm);
 856        pvt->tolm >>= 12;
 857        edac_dbg(2, "TOLM (number of 256M regions) =%u (0x%x)\n",
 858                 pvt->tolm, pvt->tolm);
 859
 860        actual_tolm = (u32) ((1000l * pvt->tolm) >> (30 - 28));
 861        edac_dbg(2, "Actual TOLM byte addr=%u.%03u GB (0x%x)\n",
 862                 actual_tolm/1000, actual_tolm % 1000, pvt->tolm << 28);
 863
 864        /* Get memory controller settings */
 865        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map, MC_SETTINGS,
 866                             &pvt->mc_settings);
 867        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map, MC_SETTINGS_A,
 868                             &pvt->mc_settings_a);
 869
 870        if (IS_SINGLE_MODE(pvt->mc_settings_a))
 871                edac_dbg(0, "Memory controller operating on single mode\n");
 872        else
 873                edac_dbg(0, "Memory controller operating on %smirrored mode\n",
 874                         IS_MIRRORED(pvt->mc_settings) ? "" : "non-");
 875
 876        edac_dbg(0, "Error detection is %s\n",
 877                 IS_ECC_ENABLED(pvt->mc_settings) ? "enabled" : "disabled");
 878        edac_dbg(0, "Retry is %s\n",
 879                 IS_RETRY_ENABLED(pvt->mc_settings) ? "enabled" : "disabled");
 880
 881        /* Get Memory Interleave Range registers */
 882        pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map, MIR0,
 883                             &pvt->mir[0]);
 884        pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map, MIR1,
 885                             &pvt->mir[1]);
 886        pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map, MIR2,
 887                             &pvt->mir[2]);
 888
 889        /* Decode the MIR regs */
 890        for (i = 0; i < MAX_MIR; i++)
 891                decode_mir(i, pvt->mir);
 892
 893        rc = i7300_init_csrows(mci);
 894        if (rc < 0)
 895                return rc;
 896
 897        /* Go and determine the size of each DIMM and place in an
 898         * orderly matrix */
 899        print_dimm_size(pvt);
 900
 901        return 0;
 902}
 903
 904/*************************************************
 905 * i7300 Functions related to device probe/release
 906 *************************************************/
 907
 908/**
 909 * i7300_put_devices() - Release the PCI devices
 910 * @mci: struct mem_ctl_info pointer
 911 */
 912static void i7300_put_devices(struct mem_ctl_info *mci)
 913{
 914        struct i7300_pvt *pvt;
 915        int branch;
 916
 917        pvt = mci->pvt_info;
 918
 919        /* Decrement usage count for devices */
 920        for (branch = 0; branch < MAX_CH_PER_BRANCH; branch++)
 921                pci_dev_put(pvt->pci_dev_2x_0_fbd_branch[branch]);
 922        pci_dev_put(pvt->pci_dev_16_2_fsb_err_regs);
 923        pci_dev_put(pvt->pci_dev_16_1_fsb_addr_map);
 924}
 925
 926/**
 927 * i7300_get_devices() - Find and perform 'get' operation on the MCH's
 928 *                       device/functions we want to reference for this driver
 929 * @mci: struct mem_ctl_info pointer
 930 *
 931 * Access and prepare the several devices for usage:
 932 * I7300 devices used by this driver:
 933 *    Device 16, functions 0,1 and 2:   PCI_DEVICE_ID_INTEL_I7300_MCH_ERR
 934 *    Device 21 function 0:             PCI_DEVICE_ID_INTEL_I7300_MCH_FB0
 935 *    Device 22 function 0:             PCI_DEVICE_ID_INTEL_I7300_MCH_FB1
 936 */
 937static int i7300_get_devices(struct mem_ctl_info *mci)
 938{
 939        struct i7300_pvt *pvt;
 940        struct pci_dev *pdev;
 941
 942        pvt = mci->pvt_info;
 943
 944        /* Attempt to 'get' the MCH register we want */
 945        pdev = NULL;
 946        while (!pvt->pci_dev_16_1_fsb_addr_map ||
 947               !pvt->pci_dev_16_2_fsb_err_regs) {
 948                pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 949                                      PCI_DEVICE_ID_INTEL_I7300_MCH_ERR, pdev);
 950                if (!pdev) {
 951                        /* End of list, leave */
 952                        i7300_printk(KERN_ERR,
 953                                "'system address,Process Bus' "
 954                                "device not found:"
 955                                "vendor 0x%x device 0x%x ERR funcs "
 956                                "(broken BIOS?)\n",
 957                                PCI_VENDOR_ID_INTEL,
 958                                PCI_DEVICE_ID_INTEL_I7300_MCH_ERR);
 959                        goto error;
 960                }
 961
 962                /* Store device 16 funcs 1 and 2 */
 963                switch (PCI_FUNC(pdev->devfn)) {
 964                case 1:
 965                        pvt->pci_dev_16_1_fsb_addr_map = pdev;
 966                        break;
 967                case 2:
 968                        pvt->pci_dev_16_2_fsb_err_regs = pdev;
 969                        break;
 970                }
 971        }
 972
 973        edac_dbg(1, "System Address, processor bus- PCI Bus ID: %s  %x:%x\n",
 974                 pci_name(pvt->pci_dev_16_0_fsb_ctlr),
 975                 pvt->pci_dev_16_0_fsb_ctlr->vendor,
 976                 pvt->pci_dev_16_0_fsb_ctlr->device);
 977        edac_dbg(1, "Branchmap, control and errors - PCI Bus ID: %s  %x:%x\n",
 978                 pci_name(pvt->pci_dev_16_1_fsb_addr_map),
 979                 pvt->pci_dev_16_1_fsb_addr_map->vendor,
 980                 pvt->pci_dev_16_1_fsb_addr_map->device);
 981        edac_dbg(1, "FSB Error Regs - PCI Bus ID: %s  %x:%x\n",
 982                 pci_name(pvt->pci_dev_16_2_fsb_err_regs),
 983                 pvt->pci_dev_16_2_fsb_err_regs->vendor,
 984                 pvt->pci_dev_16_2_fsb_err_regs->device);
 985
 986        pvt->pci_dev_2x_0_fbd_branch[0] = pci_get_device(PCI_VENDOR_ID_INTEL,
 987                                            PCI_DEVICE_ID_INTEL_I7300_MCH_FB0,
 988                                            NULL);
 989        if (!pvt->pci_dev_2x_0_fbd_branch[0]) {
 990                i7300_printk(KERN_ERR,
 991                        "MC: 'BRANCH 0' device not found:"
 992                        "vendor 0x%x device 0x%x Func 0 (broken BIOS?)\n",
 993                        PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_I7300_MCH_FB0);
 994                goto error;
 995        }
 996
 997        pvt->pci_dev_2x_0_fbd_branch[1] = pci_get_device(PCI_VENDOR_ID_INTEL,
 998                                            PCI_DEVICE_ID_INTEL_I7300_MCH_FB1,
 999                                            NULL);
1000        if (!pvt->pci_dev_2x_0_fbd_branch[1]) {
1001                i7300_printk(KERN_ERR,
1002                        "MC: 'BRANCH 1' device not found:"
1003                        "vendor 0x%x device 0x%x Func 0 "
1004                        "(broken BIOS?)\n",
1005                        PCI_VENDOR_ID_INTEL,
1006                        PCI_DEVICE_ID_INTEL_I7300_MCH_FB1);
1007                goto error;
1008        }
1009
1010        return 0;
1011
1012error:
1013        i7300_put_devices(mci);
1014        return -ENODEV;
1015}
1016
1017/**
1018 * i7300_init_one() - Probe for one instance of the device
1019 * @pdev: struct pci_dev pointer
1020 * @id: struct pci_device_id pointer - currently unused
1021 */
1022static int i7300_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
1023{
1024        struct mem_ctl_info *mci;
1025        struct edac_mc_layer layers[3];
1026        struct i7300_pvt *pvt;
1027        int rc;
1028
1029        /* wake up device */
1030        rc = pci_enable_device(pdev);
1031        if (rc == -EIO)
1032                return rc;
1033
1034        edac_dbg(0, "MC: pdev bus %u dev=0x%x fn=0x%x\n",
1035                 pdev->bus->number,
1036                 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
1037
1038        /* We only are looking for func 0 of the set */
1039        if (PCI_FUNC(pdev->devfn) != 0)
1040                return -ENODEV;
1041
1042        /* allocate a new MC control structure */
1043        layers[0].type = EDAC_MC_LAYER_BRANCH;
1044        layers[0].size = MAX_BRANCHES;
1045        layers[0].is_virt_csrow = false;
1046        layers[1].type = EDAC_MC_LAYER_CHANNEL;
1047        layers[1].size = MAX_CH_PER_BRANCH;
1048        layers[1].is_virt_csrow = true;
1049        layers[2].type = EDAC_MC_LAYER_SLOT;
1050        layers[2].size = MAX_SLOTS;
1051        layers[2].is_virt_csrow = true;
1052        mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
1053        if (mci == NULL)
1054                return -ENOMEM;
1055
1056        edac_dbg(0, "MC: mci = %p\n", mci);
1057
1058        mci->pdev = &pdev->dev; /* record ptr  to the generic device */
1059
1060        pvt = mci->pvt_info;
1061        pvt->pci_dev_16_0_fsb_ctlr = pdev;      /* Record this device in our private */
1062
1063        pvt->tmp_prt_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
1064        if (!pvt->tmp_prt_buffer) {
1065                edac_mc_free(mci);
1066                return -ENOMEM;
1067        }
1068
1069        /* 'get' the pci devices we want to reserve for our use */
1070        if (i7300_get_devices(mci))
1071                goto fail0;
1072
1073        mci->mc_idx = 0;
1074        mci->mtype_cap = MEM_FLAG_FB_DDR2;
1075        mci->edac_ctl_cap = EDAC_FLAG_NONE;
1076        mci->edac_cap = EDAC_FLAG_NONE;
1077        mci->mod_name = "i7300_edac.c";
1078        mci->mod_ver = I7300_REVISION;
1079        mci->ctl_name = i7300_devs[0].ctl_name;
1080        mci->dev_name = pci_name(pdev);
1081        mci->ctl_page_to_phys = NULL;
1082
1083        /* Set the function pointer to an actual operation function */
1084        mci->edac_check = i7300_check_error;
1085
1086        /* initialize the MC control structure 'csrows' table
1087         * with the mapping and control information */
1088        if (i7300_get_mc_regs(mci)) {
1089                edac_dbg(0, "MC: Setting mci->edac_cap to EDAC_FLAG_NONE because i7300_init_csrows() returned nonzero value\n");
1090                mci->edac_cap = EDAC_FLAG_NONE; /* no csrows found */
1091        } else {
1092                edac_dbg(1, "MC: Enable error reporting now\n");
1093                i7300_enable_error_reporting(mci);
1094        }
1095
1096        /* add this new MC control structure to EDAC's list of MCs */
1097        if (edac_mc_add_mc(mci)) {
1098                edac_dbg(0, "MC: failed edac_mc_add_mc()\n");
1099                /* FIXME: perhaps some code should go here that disables error
1100                 * reporting if we just enabled it
1101                 */
1102                goto fail1;
1103        }
1104
1105        i7300_clear_error(mci);
1106
1107        /* allocating generic PCI control info */
1108        i7300_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
1109        if (!i7300_pci) {
1110                printk(KERN_WARNING
1111                        "%s(): Unable to create PCI control\n",
1112                        __func__);
1113                printk(KERN_WARNING
1114                        "%s(): PCI error report via EDAC not setup\n",
1115                        __func__);
1116        }
1117
1118        return 0;
1119
1120        /* Error exit unwinding stack */
1121fail1:
1122
1123        i7300_put_devices(mci);
1124
1125fail0:
1126        kfree(pvt->tmp_prt_buffer);
1127        edac_mc_free(mci);
1128        return -ENODEV;
1129}
1130
1131/**
1132 * i7300_remove_one() - Remove the driver
1133 * @pdev: struct pci_dev pointer
1134 */
1135static void i7300_remove_one(struct pci_dev *pdev)
1136{
1137        struct mem_ctl_info *mci;
1138        char *tmp;
1139
1140        edac_dbg(0, "\n");
1141
1142        if (i7300_pci)
1143                edac_pci_release_generic_ctl(i7300_pci);
1144
1145        mci = edac_mc_del_mc(&pdev->dev);
1146        if (!mci)
1147                return;
1148
1149        tmp = ((struct i7300_pvt *)mci->pvt_info)->tmp_prt_buffer;
1150
1151        /* retrieve references to resources, and free those resources */
1152        i7300_put_devices(mci);
1153
1154        kfree(tmp);
1155        edac_mc_free(mci);
1156}
1157
1158/*
1159 * pci_device_id: table for which devices we are looking for
1160 *
1161 * Has only 8086:360c PCI ID
1162 */
1163static DEFINE_PCI_DEVICE_TABLE(i7300_pci_tbl) = {
1164        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_I7300_MCH_ERR)},
1165        {0,}                    /* 0 terminated list. */
1166};
1167
1168MODULE_DEVICE_TABLE(pci, i7300_pci_tbl);
1169
1170/*
1171 * i7300_driver: pci_driver structure for this module
1172 */
1173static struct pci_driver i7300_driver = {
1174        .name = "i7300_edac",
1175        .probe = i7300_init_one,
1176        .remove = i7300_remove_one,
1177        .id_table = i7300_pci_tbl,
1178};
1179
1180/**
1181 * i7300_init() - Registers the driver
1182 */
1183static int __init i7300_init(void)
1184{
1185        int pci_rc;
1186
1187        edac_dbg(2, "\n");
1188
1189        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
1190        opstate_init();
1191
1192        pci_rc = pci_register_driver(&i7300_driver);
1193
1194        return (pci_rc < 0) ? pci_rc : 0;
1195}
1196
1197/**
1198 * i7300_init() - Unregisters the driver
1199 */
1200static void __exit i7300_exit(void)
1201{
1202        edac_dbg(2, "\n");
1203        pci_unregister_driver(&i7300_driver);
1204}
1205
1206module_init(i7300_init);
1207module_exit(i7300_exit);
1208
1209MODULE_LICENSE("GPL");
1210MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
1211MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
1212MODULE_DESCRIPTION("MC Driver for Intel I7300 memory controllers - "
1213                   I7300_REVISION);
1214
1215module_param(edac_op_state, int, 0444);
1216MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
1217
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