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