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   1 /*
   2  * Intel D82875P Memory Controller kernel module
   3  * (C) 2003 Linux Networx (http://lnxi.com)
   4  * This file may be distributed under the terms of the
   5  * GNU General Public License.
   6  *
   7  * Written by Thayne Harbaugh
   8  * Contributors:
   9  *      Wang Zhenyu at intel.com
  10  *
  11  * $Id: edac_i82875p.c,v 1.5.2.11 2005/10/05 00:43:44 dsp_llnl Exp $
  12  *
  13  * Note: E7210 appears same as D82875P - zhenyu.z.wang at intel.com
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/pci.h>
  19 #include <linux/pci_ids.h>
  20 #include <linux/slab.h>
  21 #include "edac_core.h"
  22
  23 #define I82875P_REVISION        " Ver: 2.0.2 " __DATE__
  24 #define EDAC_MOD_STR            "i82875p_edac"
  25
  26 #define i82875p_printk(level, fmt, arg...) \
  27         edac_printk(level, "i82875p", fmt, ##arg)
  28
  29 #define i82875p_mc_printk(mci, level, fmt, arg...) \
  30         edac_mc_chipset_printk(mci, level, "i82875p", fmt, ##arg)
  31
  32 #ifndef PCI_DEVICE_ID_INTEL_82875_0
  33 #define PCI_DEVICE_ID_INTEL_82875_0     0x2578
  34 #endif                          /* PCI_DEVICE_ID_INTEL_82875_0 */
  35
  36 #ifndef PCI_DEVICE_ID_INTEL_82875_6
  37 #define PCI_DEVICE_ID_INTEL_82875_6     0x257e
  38 #endif                          /* PCI_DEVICE_ID_INTEL_82875_6 */
  39
  40 /* four csrows in dual channel, eight in single channel */
  41 #define I82875P_NR_CSROWS(nr_chans) (8/(nr_chans))
  42
  43 /* Intel 82875p register addresses - device 0 function 0 - DRAM Controller */
  44 #define I82875P_EAP             0x58    /* Error Address Pointer (32b)
  45                                          *
  46                                          * 31:12 block address
  47                                          * 11:0  reserved
  48                                          */
  49
  50 #define I82875P_DERRSYN         0x5c    /* DRAM Error Syndrome (8b)
  51                                          *
  52                                          *  7:0  DRAM ECC Syndrome
  53                                          */
  54
  55 #define I82875P_DES             0x5d    /* DRAM Error Status (8b)
  56                                          *
  57                                          *  7:1  reserved
  58                                          *  0    Error channel 0/1
  59                                          */
  60
  61 #define I82875P_ERRSTS          0xc8    /* Error Status Register (16b)
  62                                          *
  63                                          * 15:10 reserved
  64                                          *  9    non-DRAM lock error (ndlock)
  65                                          *  8    Sftwr Generated SMI
  66                                          *  7    ECC UE
  67                                          *  6    reserved
  68                                          *  5    MCH detects unimplemented cycle
  69                                          *  4    AGP access outside GA
  70                                          *  3    Invalid AGP access
  71                                          *  2    Invalid GA translation table
  72                                          *  1    Unsupported AGP command
  73                                          *  0    ECC CE
  74                                          */
  75
  76 #define I82875P_ERRCMD          0xca    /* Error Command (16b)
  77                                          *
  78                                          * 15:10 reserved
  79                                          *  9    SERR on non-DRAM lock
  80                                          *  8    SERR on ECC UE
  81                                          *  7    SERR on ECC CE
  82                                          *  6    target abort on high exception
  83                                          *  5    detect unimplemented cyc
  84                                          *  4    AGP access outside of GA
  85                                          *  3    SERR on invalid AGP access
  86                                          *  2    invalid translation table
  87                                          *  1    SERR on unsupported AGP command
  88                                          *  0    reserved
  89                                          */
  90
  91 /* Intel 82875p register addresses - device 6 function 0 - DRAM Controller */
  92 #define I82875P_PCICMD6         0x04    /* PCI Command Register (16b)
  93                                          *
  94                                          * 15:10 reserved
  95                                          *  9    fast back-to-back - ro 0
  96                                          *  8    SERR enable - ro 0
  97                                          *  7    addr/data stepping - ro 0
  98                                          *  6    parity err enable - ro 0
  99                                          *  5    VGA palette snoop - ro 0
 100                                          *  4    mem wr & invalidate - ro 0
 101                                          *  3    special cycle - ro 0
 102                                          *  2    bus master - ro 0
 103                                          *  1    mem access dev6 - 0(dis),1(en)
 104                                          *  0    IO access dev3 - 0(dis),1(en)
 105                                          */
 106
 107 #define I82875P_BAR6            0x10    /* Mem Delays Base ADDR Reg (32b)
 108                                          *
 109                                          * 31:12 mem base addr [31:12]
 110                                          * 11:4  address mask - ro 0
 111                                          *  3    prefetchable - ro 0(non),1(pre)
 112                                          *  2:1  mem type - ro 0
 113                                          *  0    mem space - ro 0
 114                                          */
 115
 116 /* Intel 82875p MMIO register space - device 0 function 0 - MMR space */
 117
 118 #define I82875P_DRB_SHIFT 26    /* 64MiB grain */
 119 #define I82875P_DRB             0x00    /* DRAM Row Boundary (8b x 8)
 120                                          *
 121                                          *  7    reserved
 122                                          *  6:0  64MiB row boundary addr
 123                                          */
 124
 125 #define I82875P_DRA             0x10    /* DRAM Row Attribute (4b x 8)
 126                                          *
 127                                          *  7    reserved
 128                                          *  6:4  row attr row 1
 129                                          *  3    reserved
 130                                          *  2:0  row attr row 0
 131                                          *
 132                                          * 000 =  4KiB
 133                                          * 001 =  8KiB
 134                                          * 010 = 16KiB
 135                                          * 011 = 32KiB
 136                                          */
 137
 138 #define I82875P_DRC             0x68    /* DRAM Controller Mode (32b)
 139                                          *
 140                                          * 31:30 reserved
 141                                          * 29    init complete
 142                                          * 28:23 reserved
 143                                          * 22:21 nr chan 00=1,01=2
 144                                          * 20    reserved
 145                                          * 19:18 Data Integ Mode 00=none,01=ecc
 146                                          * 17:11 reserved
 147                                          * 10:8  refresh mode
 148                                          *  7    reserved
 149                                          *  6:4  mode select
 150                                          *  3:2  reserved
 151                                          *  1:0  DRAM type 01=DDR
 152                                          */
 153
 154 enum i82875p_chips {
 155         I82875P = 0,
 156 };
 157
 158 struct i82875p_pvt {
 159         struct pci_dev *ovrfl_pdev;
 160         void __iomem *ovrfl_window;
 161 };
 162
 163 struct i82875p_dev_info {
 164         const char *ctl_name;
 165 };
 166
 167 struct i82875p_error_info {
 168         u16 errsts;
 169         u32 eap;
 170         u8 des;
 171         u8 derrsyn;
 172         u16 errsts2;
 173 };
 174
 175 static const struct i82875p_dev_info i82875p_devs[] = {
 176         [I82875P] = {
 177                 .ctl_name = "i82875p"},
 178 };
 179
 180 static struct pci_dev *mci_pdev = NULL; /* init dev: in case that AGP code has
 181                                          * already registered driver
 182                                          */
 183
 184 static int i82875p_registered = 1;
 185
 186 static struct edac_pci_ctl_info *i82875p_pci;
 187
 188 static void i82875p_get_error_info(struct mem_ctl_info *mci,
 189                                 struct i82875p_error_info *info)
 190 {
 191         struct pci_dev *pdev;
 192
 193         pdev = to_pci_dev(mci->dev);
 194
 195         /*
 196          * This is a mess because there is no atomic way to read all the
 197          * registers at once and the registers can transition from CE being
 198          * overwritten by UE.
 199          */
 200         pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts);
 201         pci_read_config_dword(pdev, I82875P_EAP, &info->eap);
 202         pci_read_config_byte(pdev, I82875P_DES, &info->des);
 203         pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn);
 204         pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts2);
 205
 206         pci_write_bits16(pdev, I82875P_ERRSTS, 0x0081, 0x0081);
 207
 208         /*
 209          * If the error is the same then we can for both reads then
 210          * the first set of reads is valid.  If there is a change then
 211          * there is a CE no info and the second set of reads is valid
 212          * and should be UE info.
 213          */
 214         if (!(info->errsts2 & 0x0081))
 215                 return;
 216
 217         if ((info->errsts ^ info->errsts2) & 0x0081) {
 218                 pci_read_config_dword(pdev, I82875P_EAP, &info->eap);
 219                 pci_read_config_byte(pdev, I82875P_DES, &info->des);
 220                 pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn);
 221         }
 222 }
 223
 224 static int i82875p_process_error_info(struct mem_ctl_info *mci,
 225                                 struct i82875p_error_info *info,
 226                                 int handle_errors)
 227 {
 228         int row, multi_chan;
 229
 230         multi_chan = mci->csrows[0].nr_channels - 1;
 231
 232         if (!(info->errsts2 & 0x0081))
 233                 return 0;
 234
 235         if (!handle_errors)
 236                 return 1;
 237
 238         if ((info->errsts ^ info->errsts2) & 0x0081) {
 239                 edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
 240                 info->errsts = info->errsts2;
 241         }
 242
 243         info->eap >>= PAGE_SHIFT;
 244         row = edac_mc_find_csrow_by_page(mci, info->eap);
 245
 246         if (info->errsts & 0x0080)
 247                 edac_mc_handle_ue(mci, info->eap, 0, row, "i82875p UE");
 248         else
 249                 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row,
 250                                 multi_chan ? (info->des & 0x1) : 0,
 251                                 "i82875p CE");
 252
 253         return 1;
 254 }
 255
 256 static void i82875p_check(struct mem_ctl_info *mci)
 257 {
 258         struct i82875p_error_info info;
 259
 260         debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
 261         i82875p_get_error_info(mci, &info);
 262         i82875p_process_error_info(mci, &info, 1);
 263 }
 264
 265 /* Return 0 on success or 1 on failure. */
 266 static int i82875p_setup_overfl_dev(struct pci_dev *pdev,
 267                                 struct pci_dev **ovrfl_pdev,
 268                                 void __iomem **ovrfl_window)
 269 {
 270         struct pci_dev *dev;
 271         void __iomem *window;
 272
 273         *ovrfl_pdev = NULL;
 274         *ovrfl_window = NULL;
 275         dev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);
 276
 277         if (dev == NULL) {
 278                 /* Intel tells BIOS developers to hide device 6 which
 279                  * configures the overflow device access containing
 280                  * the DRBs - this is where we expose device 6.
 281                  * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm
 282                  */
 283                 pci_write_bits8(pdev, 0xf4, 0x2, 0x2);
 284                 dev = pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0));
 285
 286                 if (dev == NULL)
 287                         return 1;
 288
 289                 pci_bus_add_device(dev);
 290         }
 291
 292         *ovrfl_pdev = dev;
 293
 294         if (pci_enable_device(dev)) {
 295                 i82875p_printk(KERN_ERR, "%s(): Failed to enable overflow "
 296                         "device\n", __func__);
 297                 return 1;
 298         }
 299
 300         if (pci_request_regions(dev, pci_name(dev))) {
 301 #ifdef CORRECT_BIOS
 302                 goto fail0;
 303 #endif
 304         }
 305
 306         /* cache is irrelevant for PCI bus reads/writes */
 307         window = ioremap_nocache(pci_resource_start(dev, 0),
 308                                  pci_resource_len(dev, 0));
 309
 310         if (window == NULL) {
 311                 i82875p_printk(KERN_ERR, "%s(): Failed to ioremap bar6\n",
 312                         __func__);
 313                 goto fail1;
 314         }
 315
 316         *ovrfl_window = window;
 317         return 0;
 318
 319 fail1:
 320         pci_release_regions(dev);
 321
 322 #ifdef CORRECT_BIOS
 323 fail0:
 324         pci_disable_device(dev);
 325 #endif
 326         /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
 327         return 1;
 328 }
 329
 330 /* Return 1 if dual channel mode is active.  Else return 0. */
 331 static inline int dual_channel_active(u32 drc)
 332 {
 333         return (drc >> 21) & 0x1;
 334 }
 335
 336 static void i82875p_init_csrows(struct mem_ctl_info *mci,
 337                                 struct pci_dev *pdev,
 338                                 void __iomem * ovrfl_window, u32 drc)
 339 {
 340         struct csrow_info *csrow;
 341         unsigned long last_cumul_size;
 342         u8 value;
 343         u32 drc_ddim;           /* DRAM Data Integrity Mode 0=none,2=edac */
 344         u32 cumul_size;
 345         int index;
 346
 347         drc_ddim = (drc >> 18) & 0x1;
 348         last_cumul_size = 0;
 349
 350         /* The dram row boundary (DRB) reg values are boundary address
 351          * for each DRAM row with a granularity of 32 or 64MB (single/dual
 352          * channel operation).  DRB regs are cumulative; therefore DRB7 will
 353          * contain the total memory contained in all eight rows.
 354          */
 355
 356         for (index = 0; index < mci->nr_csrows; index++) {
 357                 csrow = &mci->csrows[index];
 358
 359                 value = readb(ovrfl_window + I82875P_DRB + index);
 360                 cumul_size = value << (I82875P_DRB_SHIFT - PAGE_SHIFT);
 361                 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
 362                         cumul_size);
 363                 if (cumul_size == last_cumul_size)
 364                         continue;       /* not populated */
 365
 366                 csrow->first_page = last_cumul_size;
 367                 csrow->last_page = cumul_size - 1;
 368                 csrow->nr_pages = cumul_size - last_cumul_size;
 369                 last_cumul_size = cumul_size;
 370                 csrow->grain = 1 << 12; /* I82875P_EAP has 4KiB reolution */
 371                 csrow->mtype = MEM_DDR;
 372                 csrow->dtype = DEV_UNKNOWN;
 373                 csrow->edac_mode = drc_ddim ? EDAC_SECDED : EDAC_NONE;
 374         }
 375 }
 376
 377 static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
 378 {
 379         int rc = -ENODEV;
 380         struct mem_ctl_info *mci;
 381         struct i82875p_pvt *pvt;
 382         struct pci_dev *ovrfl_pdev;
 383         void __iomem *ovrfl_window;
 384         u32 drc;
 385         u32 nr_chans;
 386         struct i82875p_error_info discard;
 387
 388         debugf0("%s()\n", __func__);
 389         ovrfl_pdev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);
 390
 391         if (i82875p_setup_overfl_dev(pdev, &ovrfl_pdev, &ovrfl_window))
 392                 return -ENODEV;
 393         drc = readl(ovrfl_window + I82875P_DRC);
 394         nr_chans = dual_channel_active(drc) + 1;
 395         mci = edac_mc_alloc(sizeof(*pvt), I82875P_NR_CSROWS(nr_chans),
 396                         nr_chans);
 397
 398         if (!mci) {
 399                 rc = -ENOMEM;
 400                 goto fail0;
 401         }
 402
 403         debugf3("%s(): init mci\n", __func__);
 404         mci->dev = &pdev->dev;
 405         mci->mtype_cap = MEM_FLAG_DDR;
 406         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 407         mci->edac_cap = EDAC_FLAG_UNKNOWN;
 408         mci->mod_name = EDAC_MOD_STR;
 409         mci->mod_ver = I82875P_REVISION;
 410         mci->ctl_name = i82875p_devs[dev_idx].ctl_name;
 411         mci->dev_name = pci_name(pdev);
 412         mci->edac_check = i82875p_check;
 413         mci->ctl_page_to_phys = NULL;
 414         debugf3("%s(): init pvt\n", __func__);
 415         pvt = (struct i82875p_pvt *)mci->pvt_info;
 416         pvt->ovrfl_pdev = ovrfl_pdev;
 417         pvt->ovrfl_window = ovrfl_window;
 418         i82875p_init_csrows(mci, pdev, ovrfl_window, drc);
 419         i82875p_get_error_info(mci, &discard);  /* clear counters */
 420
 421         /* Here we assume that we will never see multiple instances of this
 422          * type of memory controller.  The ID is therefore hardcoded to 0.
 423          */
 424         if (edac_mc_add_mc(mci, 0)) {
 425                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 426                 goto fail1;
 427         }
 428
 429         /* allocating generic PCI control info */
 430         i82875p_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 431         if (!i82875p_pci) {
 432                 printk(KERN_WARNING
 433                         "%s(): Unable to create PCI control\n",
 434                         __func__);
 435                 printk(KERN_WARNING
 436                         "%s(): PCI error report via EDAC not setup\n",
 437                         __func__);
 438         }
 439
 440         /* get this far and it's successful */
 441         debugf3("%s(): success\n", __func__);
 442         return 0;
 443
 444 fail1:
 445         edac_mc_free(mci);
 446
 447 fail0:
 448         iounmap(ovrfl_window);
 449         pci_release_regions(ovrfl_pdev);
 450
 451         pci_disable_device(ovrfl_pdev);
 452         /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
 453         return rc;
 454 }
 455
 456 /* returns count (>= 0), or negative on error */
 457 static int __devinit i82875p_init_one(struct pci_dev *pdev,
 458                                 const struct pci_device_id *ent)
 459 {
 460         int rc;
 461
 462         debugf0("%s()\n", __func__);
 463         i82875p_printk(KERN_INFO, "i82875p init one\n");
 464
 465         if (pci_enable_device(pdev) < 0)
 466                 return -EIO;
 467
 468         rc = i82875p_probe1(pdev, ent->driver_data);
 469
 470         if (mci_pdev == NULL)
 471                 mci_pdev = pci_dev_get(pdev);
 472
 473         return rc;
 474 }
 475
 476 static void __devexit i82875p_remove_one(struct pci_dev *pdev)
 477 {
 478         struct mem_ctl_info *mci;
 479         struct i82875p_pvt *pvt = NULL;
 480
 481         debugf0("%s()\n", __func__);
 482
 483         if (i82875p_pci)
 484                 edac_pci_release_generic_ctl(i82875p_pci);
 485
 486         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 487                 return;
 488
 489         pvt = (struct i82875p_pvt *)mci->pvt_info;
 490
 491         if (pvt->ovrfl_window)
 492                 iounmap(pvt->ovrfl_window);
 493
 494         if (pvt->ovrfl_pdev) {
 495 #ifdef CORRECT_BIOS
 496                 pci_release_regions(pvt->ovrfl_pdev);
 497 #endif                          /*CORRECT_BIOS */
 498                 pci_disable_device(pvt->ovrfl_pdev);
 499                 pci_dev_put(pvt->ovrfl_pdev);
 500         }
 501
 502         edac_mc_free(mci);
 503 }
 504
 505 static const struct pci_device_id i82875p_pci_tbl[] __devinitdata = {
 506         {
 507          PCI_VEND_DEV(INTEL, 82875_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 508          I82875P},
 509         {
 510          0,
 511          }                      /* 0 terminated list. */
 512 };
 513
 514 MODULE_DEVICE_TABLE(pci, i82875p_pci_tbl);
 515
 516 static struct pci_driver i82875p_driver = {
 517         .name = EDAC_MOD_STR,
 518         .probe = i82875p_init_one,
 519         .remove = __devexit_p(i82875p_remove_one),
 520         .id_table = i82875p_pci_tbl,
 521 };
 522
 523 static int __init i82875p_init(void)
 524 {
 525         int pci_rc;
 526
 527         debugf3("%s()\n", __func__);
 528         pci_rc = pci_register_driver(&i82875p_driver);
 529
 530         if (pci_rc < 0)
 531                 goto fail0;
 532
 533         if (mci_pdev == NULL) {
 534                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 535                                         PCI_DEVICE_ID_INTEL_82875_0, NULL);
 536
 537                 if (!mci_pdev) {
 538                         debugf0("875p pci_get_device fail\n");
 539                         pci_rc = -ENODEV;
 540                         goto fail1;
 541                 }
 542
 543                 pci_rc = i82875p_init_one(mci_pdev, i82875p_pci_tbl);
 544
 545                 if (pci_rc < 0) {
 546                         debugf0("875p init fail\n");
 547                         pci_rc = -ENODEV;
 548                         goto fail1;
 549                 }
 550         }
 551
 552         return 0;
 553
 554 fail1:
 555         pci_unregister_driver(&i82875p_driver);
 556
 557 fail0:
 558         if (mci_pdev != NULL)
 559                 pci_dev_put(mci_pdev);
 560
 561         return pci_rc;
 562 }
 563
 564 static void __exit i82875p_exit(void)
 565 {
 566         debugf3("%s()\n", __func__);
 567
 568         pci_unregister_driver(&i82875p_driver);
 569
 570         if (!i82875p_registered) {
 571                 i82875p_remove_one(mci_pdev);
 572                 pci_dev_put(mci_pdev);
 573         }
 574 }
 575
 576 module_init(i82875p_init);
 577 module_exit(i82875p_exit);
 578
 579 MODULE_LICENSE("GPL");
 580 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 581 MODULE_DESCRIPTION("MC support for Intel 82875 memory hub controllers");