drivers/edac/amd76x_edac.c

   1 /*
   2  * AMD 76x 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  * Based on work by Dan Hollis <goemon at anime dot net> and others.
   9  *      http://www.anime.net/~goemon/linux-ecc/
  10  *
  11  * $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/pci.h>
  18 #include <linux/pci_ids.h>
  19 #include <linux/slab.h>
  20 #include "edac_mc.h"
  21
  22 #define AMD76X_REVISION " Ver: 2.0.0 "  __DATE__
  23
  24
  25 #define amd76x_printk(level, fmt, arg...) \
  26         edac_printk(level, "amd76x", fmt, ##arg)
  27
  28 #define amd76x_mc_printk(mci, level, fmt, arg...) \
  29         edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)
  30
  31 #define AMD76X_NR_CSROWS 8
  32 #define AMD76X_NR_CHANS  1
  33 #define AMD76X_NR_DIMMS  4
  34
  35 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */
  36
  37 #define AMD76X_ECC_MODE_STATUS  0x48    /* Mode and status of ECC (32b)
  38                                          *
  39                                          * 31:16 reserved
  40                                          * 15:14 SERR enabled: x1=ue 1x=ce
  41                                          * 13    reserved
  42                                          * 12    diag: disabled, enabled
  43                                          * 11:10 mode: dis, EC, ECC, ECC+scrub
  44                                          *  9:8  status: x1=ue 1x=ce
  45                                          *  7:4  UE cs row
  46                                          *  3:0  CE cs row
  47                                          */
  48
  49 #define AMD76X_DRAM_MODE_STATUS 0x58    /* DRAM Mode and status (32b)
  50                                          *
  51                                          * 31:26 clock disable 5 - 0
  52                                          * 25    SDRAM init
  53                                          * 24    reserved
  54                                          * 23    mode register service
  55                                          * 22:21 suspend to RAM
  56                                          * 20    burst refresh enable
  57                                          * 19    refresh disable
  58                                          * 18    reserved
  59                                          * 17:16 cycles-per-refresh
  60                                          * 15:8  reserved
  61                                          *  7:0  x4 mode enable 7 - 0
  62                                          */
  63
  64 #define AMD76X_MEM_BASE_ADDR    0xC0    /* Memory base address (8 x 32b)
  65                                          *
  66                                          * 31:23 chip-select base
  67                                          * 22:16 reserved
  68                                          * 15:7  chip-select mask
  69                                          *  6:3  reserved
  70                                          *  2:1  address mode
  71                                          *  0    chip-select enable
  72                                          */
  73
  74 struct amd76x_error_info {
  75         u32 ecc_mode_status;
  76 };
  77
  78 enum amd76x_chips {
  79         AMD761 = 0,
  80         AMD762
  81 };
  82
  83 struct amd76x_dev_info {
  84         const char *ctl_name;
  85 };
  86
  87 static const struct amd76x_dev_info amd76x_devs[] = {
  88         [AMD761] = {
  89                 .ctl_name = "AMD761"
  90         },
  91         [AMD762] = {
  92                 .ctl_name = "AMD762"
  93         },
  94 };
  95
  96 /**
  97  *      amd76x_get_error_info   -       fetch error information
  98  *      @mci: Memory controller
  99  *      @info: Info to fill in
 100  *
 101  *      Fetch and store the AMD76x ECC status. Clear pending status
 102  *      on the chip so that further errors will be reported
 103  */
 104 static void amd76x_get_error_info(struct mem_ctl_info *mci,
 105                 struct amd76x_error_info *info)
 106 {
 107         struct pci_dev *pdev;
 108
 109         pdev = to_pci_dev(mci->dev);
 110         pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS,
 111                                 &info->ecc_mode_status);
 112
 113         if (info->ecc_mode_status & BIT(8))
 114                 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
 115                                 (u32) BIT(8), (u32) BIT(8));
 116
 117         if (info->ecc_mode_status & BIT(9))
 118                 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
 119                                 (u32) BIT(9), (u32) BIT(9));
 120 }
 121
 122 /**
 123  *      amd76x_process_error_info       -       Error check
 124  *      @mci: Memory controller
 125  *      @info: Previously fetched information from chip
 126  *      @handle_errors: 1 if we should do recovery
 127  *
 128  *      Process the chip state and decide if an error has occurred.
 129  *      A return of 1 indicates an error. Also if handle_errors is true
 130  *      then attempt to handle and clean up after the error
 131  */
 132 static int amd76x_process_error_info(struct mem_ctl_info *mci,
 133                 struct amd76x_error_info *info, int handle_errors)
 134 {
 135         int error_found;
 136         u32 row;
 137
 138         error_found = 0;
 139
 140         /*
 141          *      Check for an uncorrectable error
 142          */
 143         if (info->ecc_mode_status & BIT(8)) {
 144                 error_found = 1;
 145
 146                 if (handle_errors) {
 147                         row = (info->ecc_mode_status >> 4) & 0xf;
 148                         edac_mc_handle_ue(mci, mci->csrows[row].first_page, 0,
 149                                 row, mci->ctl_name);
 150                 }
 151         }
 152
 153         /*
 154          *      Check for a correctable error
 155          */
 156         if (info->ecc_mode_status & BIT(9)) {
 157                 error_found = 1;
 158
 159                 if (handle_errors) {
 160                         row = info->ecc_mode_status & 0xf;
 161                         edac_mc_handle_ce(mci, mci->csrows[row].first_page, 0,
 162                                 0, row, 0, mci->ctl_name);
 163                 }
 164         }
 165
 166         return error_found;
 167 }
 168
 169 /**
 170  *      amd76x_check    -       Poll the controller
 171  *      @mci: Memory controller
 172  *
 173  *      Called by the poll handlers this function reads the status
 174  *      from the controller and checks for errors.
 175  */
 176 static void amd76x_check(struct mem_ctl_info *mci)
 177 {
 178         struct amd76x_error_info info;
 179         debugf3("%s()\n", __func__);
 180         amd76x_get_error_info(mci, &info);
 181         amd76x_process_error_info(mci, &info, 1);
 182 }
 183
 184 static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
 185                 enum edac_type edac_mode)
 186 {
 187         struct csrow_info *csrow;
 188         u32 mba, mba_base, mba_mask, dms;
 189         int index;
 190
 191         for (index = 0; index < mci->nr_csrows; index++) {
 192                 csrow = &mci->csrows[index];
 193
 194                 /* find the DRAM Chip Select Base address and mask */
 195                 pci_read_config_dword(pdev,
 196                                       AMD76X_MEM_BASE_ADDR + (index * 4),
 197                                       &mba);
 198
 199                 if (!(mba & BIT(0)))
 200                         continue;
 201
 202                 mba_base = mba & 0xff800000UL;
 203                 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
 204                 pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
 205                 csrow->first_page = mba_base >> PAGE_SHIFT;
 206                 csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
 207                 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 208                 csrow->page_mask = mba_mask >> PAGE_SHIFT;
 209                 csrow->grain = csrow->nr_pages << PAGE_SHIFT;
 210                 csrow->mtype = MEM_RDDR;
 211                 csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
 212                 csrow->edac_mode = edac_mode;
 213         }
 214 }
 215
 216 /**
 217  *      amd76x_probe1   -       Perform set up for detected device
 218  *      @pdev; PCI device detected
 219  *      @dev_idx: Device type index
 220  *
 221  *      We have found an AMD76x and now need to set up the memory
 222  *      controller status reporting. We configure and set up the
 223  *      memory controller reporting and claim the device.
 224  */
 225 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 226 {
 227         static const enum edac_type ems_modes[] = {
 228                 EDAC_NONE,
 229                 EDAC_EC,
 230                 EDAC_SECDED,
 231                 EDAC_SECDED
 232         };
 233         struct mem_ctl_info *mci = NULL;
 234         u32 ems;
 235         u32 ems_mode;
 236         struct amd76x_error_info discard;
 237
 238         debugf0("%s()\n", __func__);
 239         pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
 240         ems_mode = (ems >> 10) & 0x3;
 241         mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS);
 242
 243         if (mci == NULL) {
 244                 return -ENOMEM;
 245         }
 246
 247         debugf0("%s(): mci = %p\n", __func__, mci);
 248         mci->dev = &pdev->dev;
 249         mci->mtype_cap = MEM_FLAG_RDDR;
 250         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 251         mci->edac_cap = ems_mode ?
 252                         (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
 253         mci->mod_name = EDAC_MOD_STR;
 254         mci->mod_ver = AMD76X_REVISION;
 255         mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
 256         mci->edac_check = amd76x_check;
 257         mci->ctl_page_to_phys = NULL;
 258
 259         amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
 260         amd76x_get_error_info(mci, &discard);  /* clear counters */
 261
 262         /* Here we assume that we will never see multiple instances of this
 263          * type of memory controller.  The ID is therefore hardcoded to 0.
 264          */
 265         if (edac_mc_add_mc(mci,0)) {
 266                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 267                 goto fail;
 268         }
 269
 270         /* get this far and it's successful */
 271         debugf3("%s(): success\n", __func__);
 272         return 0;
 273
 274 fail:
 275         edac_mc_free(mci);
 276         return -ENODEV;
 277 }
 278
 279 /* returns count (>= 0), or negative on error */
 280 static int __devinit amd76x_init_one(struct pci_dev *pdev,
 281                 const struct pci_device_id *ent)
 282 {
 283         debugf0("%s()\n", __func__);
 284
 285         /* don't need to call pci_device_enable() */
 286         return amd76x_probe1(pdev, ent->driver_data);
 287 }
 288
 289 /**
 290  *      amd76x_remove_one       -       driver shutdown
 291  *      @pdev: PCI device being handed back
 292  *
 293  *      Called when the driver is unloaded. Find the matching mci
 294  *      structure for the device then delete the mci and free the
 295  *      resources.
 296  */
 297 static void __devexit amd76x_remove_one(struct pci_dev *pdev)
 298 {
 299         struct mem_ctl_info *mci;
 300
 301         debugf0("%s()\n", __func__);
 302
 303         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 304                 return;
 305
 306         edac_mc_free(mci);
 307 }
 308
 309 static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = {
 310         {
 311                 PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 312                 AMD762
 313         },
 314         {
 315                 PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 316                 AMD761
 317         },
 318         {
 319                 0,
 320         }       /* 0 terminated list. */
 321 };
 322
 323 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
 324
 325 static struct pci_driver amd76x_driver = {
 326         .name = EDAC_MOD_STR,
 327         .probe = amd76x_init_one,
 328         .remove = __devexit_p(amd76x_remove_one),
 329         .id_table = amd76x_pci_tbl,
 330 };
 331
 332 static int __init amd76x_init(void)
 333 {
 334         return pci_register_driver(&amd76x_driver);
 335 }
 336
 337 static void __exit amd76x_exit(void)
 338 {
 339         pci_unregister_driver(&amd76x_driver);
 340 }
 341
 342 module_init(amd76x_init);
 343 module_exit(amd76x_exit);
 344
 345 MODULE_LICENSE("GPL");
 346 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 347 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");