linux/drivers/edac/i82443bxgx_edac.c
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   1/*
   2 * Intel 82443BX/GX (440BX/GX chipset) Memory Controller EDAC kernel
   3 * module (C) 2006 Tim Small
   4 *
   5 * This file may be distributed under the terms of the GNU General
   6 * Public License.
   7 *
   8 * Written by Tim Small <tim@buttersideup.com>, based on work by Linux
   9 * Networx, Thayne Harbaugh, Dan Hollis <goemon at anime dot net> and
  10 * others.
  11 *
  12 * 440GX fix by Jason Uhlenkott <juhlenko@akamai.com>.
  13 *
  14 * Written with reference to 82443BX Host Bridge Datasheet:
  15 * http://download.intel.com/design/chipsets/datashts/29063301.pdf
  16 * references to this document given in [].
  17 *
  18 * This module doesn't support the 440LX, but it may be possible to
  19 * make it do so (the 440LX's register definitions are different, but
  20 * not completely so - I haven't studied them in enough detail to know
  21 * how easy this would be).
  22 */
  23
  24#include <linux/module.h>
  25#include <linux/init.h>
  26
  27#include <linux/pci.h>
  28#include <linux/pci_ids.h>
  29
  30
  31#include <linux/edac.h>
  32#include "edac_core.h"
  33
  34#define I82443_REVISION "0.1"
  35
  36#define EDAC_MOD_STR    "i82443bxgx_edac"
  37
  38/* The 82443BX supports SDRAM, or EDO (EDO for mobile only), "Memory
  39 * Size: 8 MB to 512 MB (1GB with Registered DIMMs) with eight memory
  40 * rows" "The 82443BX supports multiple-bit error detection and
  41 * single-bit error correction when ECC mode is enabled and
  42 * single/multi-bit error detection when correction is disabled.
  43 * During writes to the DRAM, the 82443BX generates ECC for the data
  44 * on a QWord basis. Partial QWord writes require a read-modify-write
  45 * cycle when ECC is enabled."
  46*/
  47
  48/* "Additionally, the 82443BX ensures that the data is corrected in
  49 * main memory so that accumulation of errors is prevented. Another
  50 * error within the same QWord would result in a double-bit error
  51 * which is unrecoverable. This is known as hardware scrubbing since
  52 * it requires no software intervention to correct the data in memory."
  53 */
  54
  55/* [Also see page 100 (section 4.3), "DRAM Interface"]
  56 * [Also see page 112 (section 4.6.1.4), ECC]
  57 */
  58
  59#define I82443BXGX_NR_CSROWS 8
  60#define I82443BXGX_NR_CHANS  1
  61#define I82443BXGX_NR_DIMMS  4
  62
  63/* 82443 PCI Device 0 */
  64#define I82443BXGX_NBXCFG 0x50  /* 32bit register starting at this PCI
  65                                 * config space offset */
  66#define I82443BXGX_NBXCFG_OFFSET_NON_ECCROW 24  /* Array of bits, zero if
  67                                                 * row is non-ECC */
  68#define I82443BXGX_NBXCFG_OFFSET_DRAM_FREQ 12   /* 2 bits,00=100MHz,10=66 MHz */
  69
  70#define I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY 7       /* 2 bits:       */
  71#define I82443BXGX_NBXCFG_INTEGRITY_NONE   0x0  /* 00 = Non-ECC */
  72#define I82443BXGX_NBXCFG_INTEGRITY_EC     0x1  /* 01 = EC (only) */
  73#define I82443BXGX_NBXCFG_INTEGRITY_ECC    0x2  /* 10 = ECC */
  74#define I82443BXGX_NBXCFG_INTEGRITY_SCRUB  0x3  /* 11 = ECC + HW Scrub */
  75
  76#define I82443BXGX_NBXCFG_OFFSET_ECC_DIAG_ENABLE  6
  77
  78/* 82443 PCI Device 0 */
  79#define I82443BXGX_EAP   0x80   /* 32bit register starting at this PCI
  80                                 * config space offset, Error Address
  81                                 * Pointer Register */
  82#define I82443BXGX_EAP_OFFSET_EAP  12   /* High 20 bits of error address */
  83#define I82443BXGX_EAP_OFFSET_MBE  BIT(1)       /* Err at EAP was multi-bit (W1TC) */
  84#define I82443BXGX_EAP_OFFSET_SBE  BIT(0)       /* Err at EAP was single-bit (W1TC) */
  85
  86#define I82443BXGX_ERRCMD  0x90 /* 8bit register starting at this PCI
  87                                 * config space offset. */
  88#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_MBE BIT(1)     /* 1 = enable */
  89#define I82443BXGX_ERRCMD_OFFSET_SERR_ON_SBE BIT(0)     /* 1 = enable */
  90
  91#define I82443BXGX_ERRSTS  0x91 /* 16bit register starting at this PCI
  92                                 * config space offset. */
  93#define I82443BXGX_ERRSTS_OFFSET_MBFRE 5        /* 3 bits - first err row multibit */
  94#define I82443BXGX_ERRSTS_OFFSET_MEF   BIT(4)   /* 1 = MBE occurred */
  95#define I82443BXGX_ERRSTS_OFFSET_SBFRE 1        /* 3 bits - first err row singlebit */
  96#define I82443BXGX_ERRSTS_OFFSET_SEF   BIT(0)   /* 1 = SBE occurred */
  97
  98#define I82443BXGX_DRAMC 0x57   /* 8bit register starting at this PCI
  99                                 * config space offset. */
 100#define I82443BXGX_DRAMC_OFFSET_DT 3    /* 2 bits, DRAM Type */
 101#define I82443BXGX_DRAMC_DRAM_IS_EDO 0  /* 00 = EDO */
 102#define I82443BXGX_DRAMC_DRAM_IS_SDRAM 1        /* 01 = SDRAM */
 103#define I82443BXGX_DRAMC_DRAM_IS_RSDRAM 2       /* 10 = Registered SDRAM */
 104
 105#define I82443BXGX_DRB 0x60     /* 8x 8bit registers starting at this PCI
 106                                 * config space offset. */
 107
 108/* FIXME - don't poll when ECC disabled? */
 109
 110struct i82443bxgx_edacmc_error_info {
 111        u32 eap;
 112};
 113
 114static struct edac_pci_ctl_info *i82443bxgx_pci;
 115
 116static struct pci_dev *mci_pdev;        /* init dev: in case that AGP code has
 117                                         * already registered driver
 118                                         */
 119
 120static int i82443bxgx_registered = 1;
 121
 122static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
 123                                struct i82443bxgx_edacmc_error_info
 124                                *info)
 125{
 126        struct pci_dev *pdev;
 127        pdev = to_pci_dev(mci->pdev);
 128        pci_read_config_dword(pdev, I82443BXGX_EAP, &info->eap);
 129        if (info->eap & I82443BXGX_EAP_OFFSET_SBE)
 130                /* Clear error to allow next error to be reported [p.61] */
 131                pci_write_bits32(pdev, I82443BXGX_EAP,
 132                                 I82443BXGX_EAP_OFFSET_SBE,
 133                                 I82443BXGX_EAP_OFFSET_SBE);
 134
 135        if (info->eap & I82443BXGX_EAP_OFFSET_MBE)
 136                /* Clear error to allow next error to be reported [p.61] */
 137                pci_write_bits32(pdev, I82443BXGX_EAP,
 138                                 I82443BXGX_EAP_OFFSET_MBE,
 139                                 I82443BXGX_EAP_OFFSET_MBE);
 140}
 141
 142static int i82443bxgx_edacmc_process_error_info(struct mem_ctl_info *mci,
 143                                                struct
 144                                                i82443bxgx_edacmc_error_info
 145                                                *info, int handle_errors)
 146{
 147        int error_found = 0;
 148        u32 eapaddr, page, pageoffset;
 149
 150        /* bits 30:12 hold the 4kb block in which the error occurred
 151         * [p.61] */
 152        eapaddr = (info->eap & 0xfffff000);
 153        page = eapaddr >> PAGE_SHIFT;
 154        pageoffset = eapaddr - (page << PAGE_SHIFT);
 155
 156        if (info->eap & I82443BXGX_EAP_OFFSET_SBE) {
 157                error_found = 1;
 158                if (handle_errors)
 159                        edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 160                                             page, pageoffset, 0,
 161                                             edac_mc_find_csrow_by_page(mci, page),
 162                                             0, -1, mci->ctl_name, "");
 163        }
 164
 165        if (info->eap & I82443BXGX_EAP_OFFSET_MBE) {
 166                error_found = 1;
 167                if (handle_errors)
 168                        edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 169                                             page, pageoffset, 0,
 170                                             edac_mc_find_csrow_by_page(mci, page),
 171                                             0, -1, mci->ctl_name, "");
 172        }
 173
 174        return error_found;
 175}
 176
 177static void i82443bxgx_edacmc_check(struct mem_ctl_info *mci)
 178{
 179        struct i82443bxgx_edacmc_error_info info;
 180
 181        edac_dbg(1, "MC%d\n", mci->mc_idx);
 182        i82443bxgx_edacmc_get_error_info(mci, &info);
 183        i82443bxgx_edacmc_process_error_info(mci, &info, 1);
 184}
 185
 186static void i82443bxgx_init_csrows(struct mem_ctl_info *mci,
 187                                struct pci_dev *pdev,
 188                                enum edac_type edac_mode,
 189                                enum mem_type mtype)
 190{
 191        struct csrow_info *csrow;
 192        struct dimm_info *dimm;
 193        int index;
 194        u8 drbar, dramc;
 195        u32 row_base, row_high_limit, row_high_limit_last;
 196
 197        pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
 198        row_high_limit_last = 0;
 199        for (index = 0; index < mci->nr_csrows; index++) {
 200                csrow = mci->csrows[index];
 201                dimm = csrow->channels[0]->dimm;
 202
 203                pci_read_config_byte(pdev, I82443BXGX_DRB + index, &drbar);
 204                edac_dbg(1, "MC%d: Row=%d DRB = %#0x\n",
 205                         mci->mc_idx, index, drbar);
 206                row_high_limit = ((u32) drbar << 23);
 207                /* find the DRAM Chip Select Base address and mask */
 208                edac_dbg(1, "MC%d: Row=%d, Boundary Address=%#0x, Last = %#0x\n",
 209                         mci->mc_idx, index, row_high_limit,
 210                         row_high_limit_last);
 211
 212                /* 440GX goes to 2GB, represented with a DRB of 0. */
 213                if (row_high_limit_last && !row_high_limit)
 214                        row_high_limit = 1UL << 31;
 215
 216                /* This row is empty [p.49] */
 217                if (row_high_limit == row_high_limit_last)
 218                        continue;
 219                row_base = row_high_limit_last;
 220                csrow->first_page = row_base >> PAGE_SHIFT;
 221                csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
 222                dimm->nr_pages = csrow->last_page - csrow->first_page + 1;
 223                /* EAP reports in 4kilobyte granularity [61] */
 224                dimm->grain = 1 << 12;
 225                dimm->mtype = mtype;
 226                /* I don't think 440BX can tell you device type? FIXME? */
 227                dimm->dtype = DEV_UNKNOWN;
 228                /* Mode is global to all rows on 440BX */
 229                dimm->edac_mode = edac_mode;
 230                row_high_limit_last = row_high_limit;
 231        }
 232}
 233
 234static int i82443bxgx_edacmc_probe1(struct pci_dev *pdev, int dev_idx)
 235{
 236        struct mem_ctl_info *mci;
 237        struct edac_mc_layer layers[2];
 238        u8 dramc;
 239        u32 nbxcfg, ecc_mode;
 240        enum mem_type mtype;
 241        enum edac_type edac_mode;
 242
 243        edac_dbg(0, "MC:\n");
 244
 245        /* Something is really hosed if PCI config space reads from
 246         * the MC aren't working.
 247         */
 248        if (pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg))
 249                return -EIO;
 250
 251        layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 252        layers[0].size = I82443BXGX_NR_CSROWS;
 253        layers[0].is_virt_csrow = true;
 254        layers[1].type = EDAC_MC_LAYER_CHANNEL;
 255        layers[1].size = I82443BXGX_NR_CHANS;
 256        layers[1].is_virt_csrow = false;
 257        mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
 258        if (mci == NULL)
 259                return -ENOMEM;
 260
 261        edac_dbg(0, "MC: mci = %p\n", mci);
 262        mci->pdev = &pdev->dev;
 263        mci->mtype_cap = MEM_FLAG_EDO | MEM_FLAG_SDR | MEM_FLAG_RDR;
 264        mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 265        pci_read_config_byte(pdev, I82443BXGX_DRAMC, &dramc);
 266        switch ((dramc >> I82443BXGX_DRAMC_OFFSET_DT) & (BIT(0) | BIT(1))) {
 267        case I82443BXGX_DRAMC_DRAM_IS_EDO:
 268                mtype = MEM_EDO;
 269                break;
 270        case I82443BXGX_DRAMC_DRAM_IS_SDRAM:
 271                mtype = MEM_SDR;
 272                break;
 273        case I82443BXGX_DRAMC_DRAM_IS_RSDRAM:
 274                mtype = MEM_RDR;
 275                break;
 276        default:
 277                edac_dbg(0, "Unknown/reserved DRAM type value in DRAMC register!\n");
 278                mtype = -MEM_UNKNOWN;
 279        }
 280
 281        if ((mtype == MEM_SDR) || (mtype == MEM_RDR))
 282                mci->edac_cap = mci->edac_ctl_cap;
 283        else
 284                mci->edac_cap = EDAC_FLAG_NONE;
 285
 286        mci->scrub_cap = SCRUB_FLAG_HW_SRC;
 287        pci_read_config_dword(pdev, I82443BXGX_NBXCFG, &nbxcfg);
 288        ecc_mode = ((nbxcfg >> I82443BXGX_NBXCFG_OFFSET_DRAM_INTEGRITY) &
 289                (BIT(0) | BIT(1)));
 290
 291        mci->scrub_mode = (ecc_mode == I82443BXGX_NBXCFG_INTEGRITY_SCRUB)
 292                ? SCRUB_HW_SRC : SCRUB_NONE;
 293
 294        switch (ecc_mode) {
 295        case I82443BXGX_NBXCFG_INTEGRITY_NONE:
 296                edac_mode = EDAC_NONE;
 297                break;
 298        case I82443BXGX_NBXCFG_INTEGRITY_EC:
 299                edac_mode = EDAC_EC;
 300                break;
 301        case I82443BXGX_NBXCFG_INTEGRITY_ECC:
 302        case I82443BXGX_NBXCFG_INTEGRITY_SCRUB:
 303                edac_mode = EDAC_SECDED;
 304                break;
 305        default:
 306                edac_dbg(0, "Unknown/reserved ECC state in NBXCFG register!\n");
 307                edac_mode = EDAC_UNKNOWN;
 308                break;
 309        }
 310
 311        i82443bxgx_init_csrows(mci, pdev, edac_mode, mtype);
 312
 313        /* Many BIOSes don't clear error flags on boot, so do this
 314         * here, or we get "phantom" errors occurring at module-load
 315         * time. */
 316        pci_write_bits32(pdev, I82443BXGX_EAP,
 317                        (I82443BXGX_EAP_OFFSET_SBE |
 318                                I82443BXGX_EAP_OFFSET_MBE),
 319                        (I82443BXGX_EAP_OFFSET_SBE |
 320                                I82443BXGX_EAP_OFFSET_MBE));
 321
 322        mci->mod_name = EDAC_MOD_STR;
 323        mci->mod_ver = I82443_REVISION;
 324        mci->ctl_name = "I82443BXGX";
 325        mci->dev_name = pci_name(pdev);
 326        mci->edac_check = i82443bxgx_edacmc_check;
 327        mci->ctl_page_to_phys = NULL;
 328
 329        if (edac_mc_add_mc(mci)) {
 330                edac_dbg(3, "failed edac_mc_add_mc()\n");
 331                goto fail;
 332        }
 333
 334        /* allocating generic PCI control info */
 335        i82443bxgx_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 336        if (!i82443bxgx_pci) {
 337                printk(KERN_WARNING
 338                        "%s(): Unable to create PCI control\n",
 339                        __func__);
 340                printk(KERN_WARNING
 341                        "%s(): PCI error report via EDAC not setup\n",
 342                        __func__);
 343        }
 344
 345        edac_dbg(3, "MC: success\n");
 346        return 0;
 347
 348fail:
 349        edac_mc_free(mci);
 350        return -ENODEV;
 351}
 352
 353EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_probe1);
 354
 355/* returns count (>= 0), or negative on error */
 356static int i82443bxgx_edacmc_init_one(struct pci_dev *pdev,
 357                                      const struct pci_device_id *ent)
 358{
 359        int rc;
 360
 361        edac_dbg(0, "MC:\n");
 362
 363        /* don't need to call pci_enable_device() */
 364        rc = i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
 365
 366        if (mci_pdev == NULL)
 367                mci_pdev = pci_dev_get(pdev);
 368
 369        return rc;
 370}
 371
 372static void i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
 373{
 374        struct mem_ctl_info *mci;
 375
 376        edac_dbg(0, "\n");
 377
 378        if (i82443bxgx_pci)
 379                edac_pci_release_generic_ctl(i82443bxgx_pci);
 380
 381        if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 382                return;
 383
 384        edac_mc_free(mci);
 385}
 386
 387EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_remove_one);
 388
 389static DEFINE_PCI_DEVICE_TABLE(i82443bxgx_pci_tbl) = {
 390        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_0)},
 391        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443BX_2)},
 392        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0)},
 393        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2)},
 394        {0,}                    /* 0 terminated list. */
 395};
 396
 397MODULE_DEVICE_TABLE(pci, i82443bxgx_pci_tbl);
 398
 399static struct pci_driver i82443bxgx_edacmc_driver = {
 400        .name = EDAC_MOD_STR,
 401        .probe = i82443bxgx_edacmc_init_one,
 402        .remove = i82443bxgx_edacmc_remove_one,
 403        .id_table = i82443bxgx_pci_tbl,
 404};
 405
 406static int __init i82443bxgx_edacmc_init(void)
 407{
 408        int pci_rc;
 409       /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 410       opstate_init();
 411
 412        pci_rc = pci_register_driver(&i82443bxgx_edacmc_driver);
 413        if (pci_rc < 0)
 414                goto fail0;
 415
 416        if (mci_pdev == NULL) {
 417                const struct pci_device_id *id = &i82443bxgx_pci_tbl[0];
 418                int i = 0;
 419                i82443bxgx_registered = 0;
 420
 421                while (mci_pdev == NULL && id->vendor != 0) {
 422                        mci_pdev = pci_get_device(id->vendor,
 423                                        id->device, NULL);
 424                        i++;
 425                        id = &i82443bxgx_pci_tbl[i];
 426                }
 427                if (!mci_pdev) {
 428                        edac_dbg(0, "i82443bxgx pci_get_device fail\n");
 429                        pci_rc = -ENODEV;
 430                        goto fail1;
 431                }
 432
 433                pci_rc = i82443bxgx_edacmc_init_one(mci_pdev, i82443bxgx_pci_tbl);
 434
 435                if (pci_rc < 0) {
 436                        edac_dbg(0, "i82443bxgx init fail\n");
 437                        pci_rc = -ENODEV;
 438                        goto fail1;
 439                }
 440        }
 441
 442        return 0;
 443
 444fail1:
 445        pci_unregister_driver(&i82443bxgx_edacmc_driver);
 446
 447fail0:
 448        if (mci_pdev != NULL)
 449                pci_dev_put(mci_pdev);
 450
 451        return pci_rc;
 452}
 453
 454static void __exit i82443bxgx_edacmc_exit(void)
 455{
 456        pci_unregister_driver(&i82443bxgx_edacmc_driver);
 457
 458        if (!i82443bxgx_registered)
 459                i82443bxgx_edacmc_remove_one(mci_pdev);
 460
 461        if (mci_pdev)
 462                pci_dev_put(mci_pdev);
 463}
 464
 465module_init(i82443bxgx_edacmc_init);
 466module_exit(i82443bxgx_edacmc_exit);
 467
 468MODULE_LICENSE("GPL");
 469MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD");
 470MODULE_DESCRIPTION("EDAC MC support for Intel 82443BX/GX memory controllers");
 471
 472module_param(edac_op_state, int, 0444);
 473MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
 474
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