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/edac.h>
  20 #include "edac_core.h"
  21
  22 #define AMD76X_REVISION " Ver: 2.0.2"
  23 #define EDAC_MOD_STR    "amd76x_edac"
  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_DIMMS  4
  33
  34 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */
  35
  36 #define AMD76X_ECC_MODE_STATUS  0x48    /* Mode and status of ECC (32b)
  37                                          *
  38                                          * 31:16 reserved
  39                                          * 15:14 SERR enabled: x1=ue 1x=ce
  40                                          * 13    reserved
  41                                          * 12    diag: disabled, enabled
  42                                          * 11:10 mode: dis, EC, ECC, ECC+scrub
  43                                          *  9:8  status: x1=ue 1x=ce
  44                                          *  7:4  UE cs row
  45                                          *  3:0  CE cs row
  46                                          */
  47
  48 #define AMD76X_DRAM_MODE_STATUS 0x58    /* DRAM Mode and status (32b)
  49                                          *
  50                                          * 31:26 clock disable 5 - 0
  51                                          * 25    SDRAM init
  52                                          * 24    reserved
  53                                          * 23    mode register service
  54                                          * 22:21 suspend to RAM
  55                                          * 20    burst refresh enable
  56                                          * 19    refresh disable
  57                                          * 18    reserved
  58                                          * 17:16 cycles-per-refresh
  59                                          * 15:8  reserved
  60                                          *  7:0  x4 mode enable 7 - 0
  61                                          */
  62
  63 #define AMD76X_MEM_BASE_ADDR    0xC0    /* Memory base address (8 x 32b)
  64                                          *
  65                                          * 31:23 chip-select base
  66                                          * 22:16 reserved
  67                                          * 15:7  chip-select mask
  68                                          *  6:3  reserved
  69                                          *  2:1  address mode
  70                                          *  0    chip-select enable
  71                                          */
  72
  73 struct amd76x_error_info {
  74         u32 ecc_mode_status;
  75 };
  76
  77 enum amd76x_chips {
  78         AMD761 = 0,
  79         AMD762
  80 };
  81
  82 struct amd76x_dev_info {
  83         const char *ctl_name;
  84 };
  85
  86 static const struct amd76x_dev_info amd76x_devs[] = {
  87         [AMD761] = {
  88                 .ctl_name = "AMD761"},
  89         [AMD762] = {
  90                 .ctl_name = "AMD762"},
  91 };
  92
  93 static struct edac_pci_ctl_info *amd76x_pci;
  94
  95 /**
  96  *      amd76x_get_error_info   -       fetch error information
  97  *      @mci: Memory controller
  98  *      @info: Info to fill in
  99  *
 100  *      Fetch and store the AMD76x ECC status. Clear pending status
 101  *      on the chip so that further errors will be reported
 102  */
 103 static void amd76x_get_error_info(struct mem_ctl_info *mci,
 104                                 struct amd76x_error_info *info)
 105 {
 106         struct pci_dev *pdev;
 107
 108         pdev = to_pci_dev(mci->pdev);
 109         pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS,
 110                         &info->ecc_mode_status);
 111
 112         if (info->ecc_mode_status & BIT(8))
 113                 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
 114                                  (u32) BIT(8), (u32) BIT(8));
 115
 116         if (info->ecc_mode_status & BIT(9))
 117                 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
 118                                  (u32) BIT(9), (u32) BIT(9));
 119 }
 120
 121 /**
 122  *      amd76x_process_error_info       -       Error check
 123  *      @mci: Memory controller
 124  *      @info: Previously fetched information from chip
 125  *      @handle_errors: 1 if we should do recovery
 126  *
 127  *      Process the chip state and decide if an error has occurred.
 128  *      A return of 1 indicates an error. Also if handle_errors is true
 129  *      then attempt to handle and clean up after the error
 130  */
 131 static int amd76x_process_error_info(struct mem_ctl_info *mci,
 132                                 struct amd76x_error_info *info,
 133                                 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_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 149                                              mci->csrows[row]->first_page, 0, 0,
 150                                              row, 0, -1,
 151                                              mci->ctl_name, "");
 152                 }
 153         }
 154
 155         /*
 156          *      Check for a correctable error
 157          */
 158         if (info->ecc_mode_status & BIT(9)) {
 159                 error_found = 1;
 160
 161                 if (handle_errors) {
 162                         row = info->ecc_mode_status & 0xf;
 163                         edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 164                                              mci->csrows[row]->first_page, 0, 0,
 165                                              row, 0, -1,
 166                                              mci->ctl_name, "");
 167                 }
 168         }
 169
 170         return error_found;
 171 }
 172
 173 /**
 174  *      amd76x_check    -       Poll the controller
 175  *      @mci: Memory controller
 176  *
 177  *      Called by the poll handlers this function reads the status
 178  *      from the controller and checks for errors.
 179  */
 180 static void amd76x_check(struct mem_ctl_info *mci)
 181 {
 182         struct amd76x_error_info info;
 183         edac_dbg(3, "\n");
 184         amd76x_get_error_info(mci, &info);
 185         amd76x_process_error_info(mci, &info, 1);
 186 }
 187
 188 static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
 189                         enum edac_type edac_mode)
 190 {
 191         struct csrow_info *csrow;
 192         struct dimm_info *dimm;
 193         u32 mba, mba_base, mba_mask, dms;
 194         int index;
 195
 196         for (index = 0; index < mci->nr_csrows; index++) {
 197                 csrow = mci->csrows[index];
 198                 dimm = csrow->channels[0]->dimm;
 199
 200                 /* find the DRAM Chip Select Base address and mask */
 201                 pci_read_config_dword(pdev,
 202                                 AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
 203
 204                 if (!(mba & BIT(0)))
 205                         continue;
 206
 207                 mba_base = mba & 0xff800000UL;
 208                 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
 209                 pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
 210                 csrow->first_page = mba_base >> PAGE_SHIFT;
 211                 dimm->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
 212                 csrow->last_page = csrow->first_page + dimm->nr_pages - 1;
 213                 csrow->page_mask = mba_mask >> PAGE_SHIFT;
 214                 dimm->grain = dimm->nr_pages << PAGE_SHIFT;
 215                 dimm->mtype = MEM_RDDR;
 216                 dimm->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
 217                 dimm->edac_mode = edac_mode;
 218         }
 219 }
 220
 221 /**
 222  *      amd76x_probe1   -       Perform set up for detected device
 223  *      @pdev; PCI device detected
 224  *      @dev_idx: Device type index
 225  *
 226  *      We have found an AMD76x and now need to set up the memory
 227  *      controller status reporting. We configure and set up the
 228  *      memory controller reporting and claim the device.
 229  */
 230 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 231 {
 232         static const enum edac_type ems_modes[] = {
 233                 EDAC_NONE,
 234                 EDAC_EC,
 235                 EDAC_SECDED,
 236                 EDAC_SECDED
 237         };
 238         struct mem_ctl_info *mci;
 239         struct edac_mc_layer layers[2];
 240         u32 ems;
 241         u32 ems_mode;
 242         struct amd76x_error_info discard;
 243
 244         edac_dbg(0, "\n");
 245         pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
 246         ems_mode = (ems >> 10) & 0x3;
 247
 248         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 249         layers[0].size = AMD76X_NR_CSROWS;
 250         layers[0].is_virt_csrow = true;
 251         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 252         layers[1].size = 1;
 253         layers[1].is_virt_csrow = false;
 254         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
 255
 256         if (mci == NULL)
 257                 return -ENOMEM;
 258
 259         edac_dbg(0, "mci = %p\n", mci);
 260         mci->pdev = &pdev->dev;
 261         mci->mtype_cap = MEM_FLAG_RDDR;
 262         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 263         mci->edac_cap = ems_mode ?
 264                 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
 265         mci->mod_name = EDAC_MOD_STR;
 266         mci->mod_ver = AMD76X_REVISION;
 267         mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
 268         mci->dev_name = pci_name(pdev);
 269         mci->edac_check = amd76x_check;
 270         mci->ctl_page_to_phys = NULL;
 271
 272         amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
 273         amd76x_get_error_info(mci, &discard);   /* clear counters */
 274
 275         /* Here we assume that we will never see multiple instances of this
 276          * type of memory controller.  The ID is therefore hardcoded to 0.
 277          */
 278         if (edac_mc_add_mc(mci)) {
 279                 edac_dbg(3, "failed edac_mc_add_mc()\n");
 280                 goto fail;
 281         }
 282
 283         /* allocating generic PCI control info */
 284         amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 285         if (!amd76x_pci) {
 286                 printk(KERN_WARNING
 287                         "%s(): Unable to create PCI control\n",
 288                         __func__);
 289                 printk(KERN_WARNING
 290                         "%s(): PCI error report via EDAC not setup\n",
 291                         __func__);
 292         }
 293
 294         /* get this far and it's successful */
 295         edac_dbg(3, "success\n");
 296         return 0;
 297
 298 fail:
 299         edac_mc_free(mci);
 300         return -ENODEV;
 301 }
 302
 303 /* returns count (>= 0), or negative on error */
 304 static int amd76x_init_one(struct pci_dev *pdev,
 305                            const struct pci_device_id *ent)
 306 {
 307         edac_dbg(0, "\n");
 308
 309         /* don't need to call pci_enable_device() */
 310         return amd76x_probe1(pdev, ent->driver_data);
 311 }
 312
 313 /**
 314  *      amd76x_remove_one       -       driver shutdown
 315  *      @pdev: PCI device being handed back
 316  *
 317  *      Called when the driver is unloaded. Find the matching mci
 318  *      structure for the device then delete the mci and free the
 319  *      resources.
 320  */
 321 static void amd76x_remove_one(struct pci_dev *pdev)
 322 {
 323         struct mem_ctl_info *mci;
 324
 325         edac_dbg(0, "\n");
 326
 327         if (amd76x_pci)
 328                 edac_pci_release_generic_ctl(amd76x_pci);
 329
 330         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 331                 return;
 332
 333         edac_mc_free(mci);
 334 }
 335
 336 static DEFINE_PCI_DEVICE_TABLE(amd76x_pci_tbl) = {
 337         {
 338          PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 339          AMD762},
 340         {
 341          PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 342          AMD761},
 343         {
 344          0,
 345          }                      /* 0 terminated list. */
 346 };
 347
 348 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
 349
 350 static struct pci_driver amd76x_driver = {
 351         .name = EDAC_MOD_STR,
 352         .probe = amd76x_init_one,
 353         .remove = amd76x_remove_one,
 354         .id_table = amd76x_pci_tbl,
 355 };
 356
 357 static int __init amd76x_init(void)
 358 {
 359        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 360        opstate_init();
 361
 362         return pci_register_driver(&amd76x_driver);
 363 }
 364
 365 static void __exit amd76x_exit(void)
 366 {
 367         pci_unregister_driver(&amd76x_driver);
 368 }
 369
 370 module_init(amd76x_init);
 371 module_exit(amd76x_exit);
 372
 373 MODULE_LICENSE("GPL");
 374 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 375 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
 376
 377 module_param(edac_op_state, int, 0444);
 378 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");