drivers/edac/r82600_edac.c

   1 /*
   2  * Radisys 82600 Embedded chipset Memory Controller kernel module
   3  * (C) 2005 EADS Astrium
   4  * This file may be distributed under the terms of the
   5  * GNU General Public License.
   6  *
   7  * Written by Tim Small <tim@buttersideup.com>, based on work by Thayne
   8  * Harbaugh, Dan Hollis <goemon at anime dot net> and others.
   9  *
  10  * $Id: edac_r82600.c,v 1.1.2.6 2005/10/05 00:43:44 dsp_llnl Exp $
  11  *
  12  * Written with reference to 82600 High Integration Dual PCI System
  13  * Controller Data Book:
  14  * www.radisys.com/files/support_downloads/007-01277-0002.82600DataBook.pdf
  15  * references to this document given in []
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/pci.h>
  21 #include <linux/pci_ids.h>
  22 #include <linux/edac.h>
  23 #include "edac_core.h"
  24
  25 #define R82600_REVISION " Ver: 2.0.2"
  26 #define EDAC_MOD_STR    "r82600_edac"
  27
  28 #define r82600_printk(level, fmt, arg...) \
  29         edac_printk(level, "r82600", fmt, ##arg)
  30
  31 #define r82600_mc_printk(mci, level, fmt, arg...) \
  32         edac_mc_chipset_printk(mci, level, "r82600", fmt, ##arg)
  33
  34 /* Radisys say "The 82600 integrates a main memory SDRAM controller that
  35  * supports up to four banks of memory. The four banks can support a mix of
  36  * sizes of 64 bit wide (72 bits with ECC) Synchronous DRAM (SDRAM) DIMMs,
  37  * each of which can be any size from 16MB to 512MB. Both registered (control
  38  * signals buffered) and unbuffered DIMM types are supported. Mixing of
  39  * registered and unbuffered DIMMs as well as mixing of ECC and non-ECC DIMMs
  40  * is not allowed. The 82600 SDRAM interface operates at the same frequency as
  41  * the CPU bus, 66MHz, 100MHz or 133MHz."
  42  */
  43
  44 #define R82600_NR_CSROWS 4
  45 #define R82600_NR_CHANS  1
  46 #define R82600_NR_DIMMS  4
  47
  48 #define R82600_BRIDGE_ID  0x8200
  49
  50 /* Radisys 82600 register addresses - device 0 function 0 - PCI bridge */
  51 #define R82600_DRAMC    0x57    /* Various SDRAM related control bits
  52                                  * all bits are R/W
  53                                  *
  54                                  * 7    SDRAM ISA Hole Enable
  55                                  * 6    Flash Page Mode Enable
  56                                  * 5    ECC Enable: 1=ECC 0=noECC
  57                                  * 4    DRAM DIMM Type: 1=
  58                                  * 3    BIOS Alias Disable
  59                                  * 2    SDRAM BIOS Flash Write Enable
  60                                  * 1:0  SDRAM Refresh Rate: 00=Disabled
  61                                  *          01=7.8usec (256Mbit SDRAMs)
  62                                  *          10=15.6us 11=125usec
  63                                  */
  64
  65 #define R82600_SDRAMC   0x76    /* "SDRAM Control Register"
  66                                  * More SDRAM related control bits
  67                                  * all bits are R/W
  68                                  *
  69                                  * 15:8 Reserved.
  70                                  *
  71                                  * 7:5  Special SDRAM Mode Select
  72                                  *
  73                                  * 4    Force ECC
  74                                  *
  75                                  *        1=Drive ECC bits to 0 during
  76                                  *          write cycles (i.e. ECC test mode)
  77                                  *
  78                                  *        0=Normal ECC functioning
  79                                  *
  80                                  * 3    Enhanced Paging Enable
  81                                  *
  82                                  * 2    CAS# Latency 0=3clks 1=2clks
  83                                  *
  84                                  * 1    RAS# to CAS# Delay 0=3 1=2
  85                                  *
  86                                  * 0    RAS# Precharge     0=3 1=2
  87                                  */
  88
  89 #define R82600_EAP      0x80    /* ECC Error Address Pointer Register
  90                                  *
  91                                  * 31    Disable Hardware Scrubbing (RW)
  92                                  *        0=Scrub on corrected read
  93                                  *        1=Don't scrub on corrected read
  94                                  *
  95                                  * 30:12 Error Address Pointer (RO)
  96                                  *        Upper 19 bits of error address
  97                                  *
  98                                  * 11:4  Syndrome Bits (RO)
  99                                  *
 100                                  * 3     BSERR# on multibit error (RW)
 101                                  *        1=enable 0=disable
 102                                  *
 103                                  * 2     NMI on Single Bit Eror (RW)
 104                                  *        1=NMI triggered by SBE n.b. other
 105                                  *          prerequeists
 106                                  *        0=NMI not triggered
 107                                  *
 108                                  * 1     MBE (R/WC)
 109                                  *        read 1=MBE at EAP (see above)
 110                                  *        read 0=no MBE, or SBE occurred first
 111                                  *        write 1=Clear MBE status (must also
 112                                  *          clear SBE)
 113                                  *        write 0=NOP
 114                                  *
 115                                  * 1     SBE (R/WC)
 116                                  *        read 1=SBE at EAP (see above)
 117                                  *        read 0=no SBE, or MBE occurred first
 118                                  *        write 1=Clear SBE status (must also
 119                                  *          clear MBE)
 120                                  *        write 0=NOP
 121                                  */
 122
 123 #define R82600_DRBA     0x60    /* + 0x60..0x63 SDRAM Row Boundary Address
 124                                  *  Registers
 125                                  *
 126                                  * 7:0  Address lines 30:24 - upper limit of
 127                                  * each row [p57]
 128                                  */
 129
 130 struct r82600_error_info {
 131         u32 eapr;
 132 };
 133
 134 static bool disable_hardware_scrub;
 135
 136 static struct edac_pci_ctl_info *r82600_pci;
 137
 138 static void r82600_get_error_info(struct mem_ctl_info *mci,
 139                                 struct r82600_error_info *info)
 140 {
 141         struct pci_dev *pdev;
 142
 143         pdev = to_pci_dev(mci->dev);
 144         pci_read_config_dword(pdev, R82600_EAP, &info->eapr);
 145
 146         if (info->eapr & BIT(0))
 147                 /* Clear error to allow next error to be reported [p.62] */
 148                 pci_write_bits32(pdev, R82600_EAP,
 149                                  ((u32) BIT(0) & (u32) BIT(1)),
 150                                  ((u32) BIT(0) & (u32) BIT(1)));
 151
 152         if (info->eapr & BIT(1))
 153                 /* Clear error to allow next error to be reported [p.62] */
 154                 pci_write_bits32(pdev, R82600_EAP,
 155                                  ((u32) BIT(0) & (u32) BIT(1)),
 156                                  ((u32) BIT(0) & (u32) BIT(1)));
 157 }
 158
 159 static int r82600_process_error_info(struct mem_ctl_info *mci,
 160                                 struct r82600_error_info *info,
 161                                 int handle_errors)
 162 {
 163         int error_found;
 164         u32 eapaddr, page;
 165         u32 syndrome;
 166
 167         error_found = 0;
 168
 169         /* bits 30:12 store the upper 19 bits of the 32 bit error address */
 170         eapaddr = ((info->eapr >> 12) & 0x7FFF) << 13;
 171         /* Syndrome in bits 11:4 [p.62]       */
 172         syndrome = (info->eapr >> 4) & 0xFF;
 173
 174         /* the R82600 reports at less than page *
 175          * granularity (upper 19 bits only)     */
 176         page = eapaddr >> PAGE_SHIFT;
 177
 178         if (info->eapr & BIT(0)) {      /* CE? */
 179                 error_found = 1;
 180
 181                 if (handle_errors)
 182                         edac_mc_handle_ce(mci, page, 0, /* not avail */
 183                                         syndrome,
 184                                         edac_mc_find_csrow_by_page(mci, page),
 185                                         0, mci->ctl_name);
 186         }
 187
 188         if (info->eapr & BIT(1)) {      /* UE? */
 189                 error_found = 1;
 190
 191                 if (handle_errors)
 192                         /* 82600 doesn't give enough info */
 193                         edac_mc_handle_ue(mci, page, 0,
 194                                         edac_mc_find_csrow_by_page(mci, page),
 195                                         mci->ctl_name);
 196         }
 197
 198         return error_found;
 199 }
 200
 201 static void r82600_check(struct mem_ctl_info *mci)
 202 {
 203         struct r82600_error_info info;
 204
 205         debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
 206         r82600_get_error_info(mci, &info);
 207         r82600_process_error_info(mci, &info, 1);
 208 }
 209
 210 static inline int ecc_enabled(u8 dramcr)
 211 {
 212         return dramcr & BIT(5);
 213 }
 214
 215 static void r82600_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
 216                         u8 dramcr)
 217 {
 218         struct csrow_info *csrow;
 219         struct dimm_info *dimm;
 220         int index;
 221         u8 drbar;               /* SDRAM Row Boundary Address Register */
 222         u32 row_high_limit, row_high_limit_last;
 223         u32 reg_sdram, ecc_on, row_base;
 224
 225         ecc_on = ecc_enabled(dramcr);
 226         reg_sdram = dramcr & BIT(4);
 227         row_high_limit_last = 0;
 228
 229         for (index = 0; index < mci->nr_csrows; index++) {
 230                 csrow = &mci->csrows[index];
 231                 dimm = csrow->channels[0].dimm;
 232
 233                 /* find the DRAM Chip Select Base address and mask */
 234                 pci_read_config_byte(pdev, R82600_DRBA + index, &drbar);
 235
 236                 debugf1("%s() Row=%d DRBA = %#0x\n", __func__, index, drbar);
 237
 238                 row_high_limit = ((u32) drbar << 24);
 239 /*              row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
 240
 241                 debugf1("%s() Row=%d, Boundary Address=%#0x, Last = %#0x\n",
 242                         __func__, index, row_high_limit, row_high_limit_last);
 243
 244                 /* Empty row [p.57] */
 245                 if (row_high_limit == row_high_limit_last)
 246                         continue;
 247
 248                 row_base = row_high_limit_last;
 249
 250                 csrow->first_page = row_base >> PAGE_SHIFT;
 251                 csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
 252
 253                 dimm->nr_pages = csrow->last_page - csrow->first_page + 1;
 254                 /* Error address is top 19 bits - so granularity is      *
 255                  * 14 bits                                               */
 256                 dimm->grain = 1 << 14;
 257                 dimm->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
 258                 /* FIXME - check that this is unknowable with this chipset */
 259                 dimm->dtype = DEV_UNKNOWN;
 260
 261                 /* Mode is global on 82600 */
 262                 dimm->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
 263                 row_high_limit_last = row_high_limit;
 264         }
 265 }
 266
 267 static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
 268 {
 269         struct mem_ctl_info *mci;
 270         u8 dramcr;
 271         u32 eapr;
 272         u32 scrub_disabled;
 273         u32 sdram_refresh_rate;
 274         struct r82600_error_info discard;
 275
 276         debugf0("%s()\n", __func__);
 277         pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
 278         pci_read_config_dword(pdev, R82600_EAP, &eapr);
 279         scrub_disabled = eapr & BIT(31);
 280         sdram_refresh_rate = dramcr & (BIT(0) | BIT(1));
 281         debugf2("%s(): sdram refresh rate = %#0x\n", __func__,
 282                 sdram_refresh_rate);
 283         debugf2("%s(): DRAMC register = %#0x\n", __func__, dramcr);
 284         mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS, 0);
 285
 286         if (mci == NULL)
 287                 return -ENOMEM;
 288
 289         debugf0("%s(): mci = %p\n", __func__, mci);
 290         mci->dev = &pdev->dev;
 291         mci->mtype_cap = MEM_FLAG_RDDR | MEM_FLAG_DDR;
 292         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 293         /* FIXME try to work out if the chip leads have been used for COM2
 294          * instead on this board? [MA6?] MAYBE:
 295          */
 296
 297         /* On the R82600, the pins for memory bits 72:65 - i.e. the   *
 298          * EC bits are shared with the pins for COM2 (!), so if COM2  *
 299          * is enabled, we assume COM2 is wired up, and thus no EDAC   *
 300          * is possible.                                               */
 301         mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 302
 303         if (ecc_enabled(dramcr)) {
 304                 if (scrub_disabled)
 305                         debugf3("%s(): mci = %p - Scrubbing disabled! EAP: "
 306                                 "%#0x\n", __func__, mci, eapr);
 307         } else
 308                 mci->edac_cap = EDAC_FLAG_NONE;
 309
 310         mci->mod_name = EDAC_MOD_STR;
 311         mci->mod_ver = R82600_REVISION;
 312         mci->ctl_name = "R82600";
 313         mci->dev_name = pci_name(pdev);
 314         mci->edac_check = r82600_check;
 315         mci->ctl_page_to_phys = NULL;
 316         r82600_init_csrows(mci, pdev, dramcr);
 317         r82600_get_error_info(mci, &discard);   /* clear counters */
 318
 319         /* Here we assume that we will never see multiple instances of this
 320          * type of memory controller.  The ID is therefore hardcoded to 0.
 321          */
 322         if (edac_mc_add_mc(mci)) {
 323                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 324                 goto fail;
 325         }
 326
 327         /* get this far and it's successful */
 328
 329         if (disable_hardware_scrub) {
 330                 debugf3("%s(): Disabling Hardware Scrub (scrub on error)\n",
 331                         __func__);
 332                 pci_write_bits32(pdev, R82600_EAP, BIT(31), BIT(31));
 333         }
 334
 335         /* allocating generic PCI control info */
 336         r82600_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 337         if (!r82600_pci) {
 338                 printk(KERN_WARNING
 339                         "%s(): Unable to create PCI control\n",
 340                         __func__);
 341                 printk(KERN_WARNING
 342                         "%s(): PCI error report via EDAC not setup\n",
 343                         __func__);
 344         }
 345
 346         debugf3("%s(): success\n", __func__);
 347         return 0;
 348
 349 fail:
 350         edac_mc_free(mci);
 351         return -ENODEV;
 352 }
 353
 354 /* returns count (>= 0), or negative on error */
 355 static int __devinit r82600_init_one(struct pci_dev *pdev,
 356                                 const struct pci_device_id *ent)
 357 {
 358         debugf0("%s()\n", __func__);
 359
 360         /* don't need to call pci_enable_device() */
 361         return r82600_probe1(pdev, ent->driver_data);
 362 }
 363
 364 static void __devexit r82600_remove_one(struct pci_dev *pdev)
 365 {
 366         struct mem_ctl_info *mci;
 367
 368         debugf0("%s()\n", __func__);
 369
 370         if (r82600_pci)
 371                 edac_pci_release_generic_ctl(r82600_pci);
 372
 373         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 374                 return;
 375
 376         edac_mc_free(mci);
 377 }
 378
 379 static DEFINE_PCI_DEVICE_TABLE(r82600_pci_tbl) = {
 380         {
 381          PCI_DEVICE(PCI_VENDOR_ID_RADISYS, R82600_BRIDGE_ID)
 382          },
 383         {
 384          0,
 385          }                      /* 0 terminated list. */
 386 };
 387
 388 MODULE_DEVICE_TABLE(pci, r82600_pci_tbl);
 389
 390 static struct pci_driver r82600_driver = {
 391         .name = EDAC_MOD_STR,
 392         .probe = r82600_init_one,
 393         .remove = __devexit_p(r82600_remove_one),
 394         .id_table = r82600_pci_tbl,
 395 };
 396
 397 static int __init r82600_init(void)
 398 {
 399        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 400        opstate_init();
 401
 402         return pci_register_driver(&r82600_driver);
 403 }
 404
 405 static void __exit r82600_exit(void)
 406 {
 407         pci_unregister_driver(&r82600_driver);
 408 }
 409
 410 module_init(r82600_init);
 411 module_exit(r82600_exit);
 412
 413 MODULE_LICENSE("GPL");
 414 MODULE_AUTHOR("Tim Small <tim@buttersideup.com> - WPAD Ltd. "
 415                 "on behalf of EADS Astrium");
 416 MODULE_DESCRIPTION("MC support for Radisys 82600 memory controllers");
 417
 418 module_param(disable_hardware_scrub, bool, 0644);
 419 MODULE_PARM_DESC(disable_hardware_scrub,
 420                  "If set, disable the chipset's automatic scrub for CEs");
 421
 422 module_param(edac_op_state, int, 0444);
 423 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");