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_module.h"
  21
  22 #define EDAC_MOD_STR    "amd76x_edac"
  23
  24 #define amd76x_printk(level, fmt, arg...) \
  25         edac_printk(level, "amd76x", fmt, ##arg)
  26
  27 #define amd76x_mc_printk(mci, level, fmt, arg...) \
  28         edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)
  29
  30 #define AMD76X_NR_CSROWS 8
  31 #define AMD76X_NR_DIMMS  4
  32
  33 /* AMD 76x register addresses - device 0 function 0 - PCI bridge */
  34
  35 #define AMD76X_ECC_MODE_STATUS  0x48    /* Mode and status of ECC (32b)
  36                                          *
  37                                          * 31:16 reserved
  38                                          * 15:14 SERR enabled: x1=ue 1x=ce
  39                                          * 13    reserved
  40                                          * 12    diag: disabled, enabled
  41                                          * 11:10 mode: dis, EC, ECC, ECC+scrub
  42                                          *  9:8  status: x1=ue 1x=ce
  43                                          *  7:4  UE cs row
  44                                          *  3:0  CE cs row
  45                                          */
  46
  47 #define AMD76X_DRAM_MODE_STATUS 0x58    /* DRAM Mode and status (32b)
  48                                          *
  49                                          * 31:26 clock disable 5 - 0
  50                                          * 25    SDRAM init
  51                                          * 24    reserved
  52                                          * 23    mode register service
  53                                          * 22:21 suspend to RAM
  54                                          * 20    burst refresh enable
  55                                          * 19    refresh disable
  56                                          * 18    reserved
  57                                          * 17:16 cycles-per-refresh
  58                                          * 15:8  reserved
  59                                          *  7:0  x4 mode enable 7 - 0
  60                                          */
  61
  62 #define AMD76X_MEM_BASE_ADDR    0xC0    /* Memory base address (8 x 32b)
  63                                          *
  64                                          * 31:23 chip-select base
  65                                          * 22:16 reserved
  66                                          * 15:7  chip-select mask
  67                                          *  6:3  reserved
  68                                          *  2:1  address mode
  69                                          *  0    chip-select enable
  70                                          */
  71
  72 struct amd76x_error_info {
  73         u32 ecc_mode_status;
  74 };
  75
  76 enum amd76x_chips {
  77         AMD761 = 0,
  78         AMD762
  79 };
  80
  81 struct amd76x_dev_info {
  82         const char *ctl_name;
  83 };
  84
  85 static const struct amd76x_dev_info amd76x_devs[] = {
  86         [AMD761] = {
  87                 .ctl_name = "AMD761"},
  88         [AMD762] = {
  89                 .ctl_name = "AMD762"},
  90 };
  91
  92 static struct edac_pci_ctl_info *amd76x_pci;
  93
  94 /**
  95  *      amd76x_get_error_info   -       fetch error information
  96  *      @mci: Memory controller
  97  *      @info: Info to fill in
  98  *
  99  *      Fetch and store the AMD76x ECC status. Clear pending status
 100  *      on the chip so that further errors will be reported
 101  */
 102 static void amd76x_get_error_info(struct mem_ctl_info *mci,
 103                                 struct amd76x_error_info *info)
 104 {
 105         struct pci_dev *pdev;
 106
 107         pdev = to_pci_dev(mci->pdev);
 108         pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS,
 109                         &info->ecc_mode_status);
 110
 111         if (info->ecc_mode_status & BIT(8))
 112                 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
 113                                  (u32) BIT(8), (u32) BIT(8));
 114
 115         if (info->ecc_mode_status & BIT(9))
 116                 pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
 117                                  (u32) BIT(9), (u32) BIT(9));
 118 }
 119
 120 /**
 121  *      amd76x_process_error_info       -       Error check
 122  *      @mci: Memory controller
 123  *      @info: Previously fetched information from chip
 124  *      @handle_errors: 1 if we should do recovery
 125  *
 126  *      Process the chip state and decide if an error has occurred.
 127  *      A return of 1 indicates an error. Also if handle_errors is true
 128  *      then attempt to handle and clean up after the error
 129  */
 130 static int amd76x_process_error_info(struct mem_ctl_info *mci,
 131                                 struct amd76x_error_info *info,
 132                                 int handle_errors)
 133 {
 134         int error_found;
 135         u32 row;
 136
 137         error_found = 0;
 138
 139         /*
 140          *      Check for an uncorrectable error
 141          */
 142         if (info->ecc_mode_status & BIT(8)) {
 143                 error_found = 1;
 144
 145                 if (handle_errors) {
 146                         row = (info->ecc_mode_status >> 4) & 0xf;
 147                         edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 148                                              mci->csrows[row]->first_page, 0, 0,
 149                                              row, 0, -1,
 150                                              mci->ctl_name, "");
 151                 }
 152         }
 153
 154         /*
 155          *      Check for a correctable error
 156          */
 157         if (info->ecc_mode_status & BIT(9)) {
 158                 error_found = 1;
 159
 160                 if (handle_errors) {
 161                         row = info->ecc_mode_status & 0xf;
 162                         edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 163                                              mci->csrows[row]->first_page, 0, 0,
 164                                              row, 0, -1,
 165                                              mci->ctl_name, "");
 166                 }
 167         }
 168
 169         return error_found;
 170 }
 171
 172 /**
 173  *      amd76x_check    -       Poll the controller
 174  *      @mci: Memory controller
 175  *
 176  *      Called by the poll handlers this function reads the status
 177  *      from the controller and checks for errors.
 178  */
 179 static void amd76x_check(struct mem_ctl_info *mci)
 180 {
 181         struct amd76x_error_info info;
 182         amd76x_get_error_info(mci, &info);
 183         amd76x_process_error_info(mci, &info, 1);
 184 }
 185
 186 static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
 187                         enum edac_type edac_mode)
 188 {
 189         struct csrow_info *csrow;
 190         struct dimm_info *dimm;
 191         u32 mba, mba_base, mba_mask, dms;
 192         int index;
 193
 194         for (index = 0; index < mci->nr_csrows; index++) {
 195                 csrow = mci->csrows[index];
 196                 dimm = csrow->channels[0]->dimm;
 197
 198                 /* find the DRAM Chip Select Base address and mask */
 199                 pci_read_config_dword(pdev,
 200                                 AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
 201
 202                 if (!(mba & BIT(0)))
 203                         continue;
 204
 205                 mba_base = mba & 0xff800000UL;
 206                 mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
 207                 pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
 208                 csrow->first_page = mba_base >> PAGE_SHIFT;
 209                 dimm->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
 210                 csrow->last_page = csrow->first_page + dimm->nr_pages - 1;
 211                 csrow->page_mask = mba_mask >> PAGE_SHIFT;
 212                 dimm->grain = dimm->nr_pages << PAGE_SHIFT;
 213                 dimm->mtype = MEM_RDDR;
 214                 dimm->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
 215                 dimm->edac_mode = edac_mode;
 216         }
 217 }
 218
 219 /**
 220  *      amd76x_probe1   -       Perform set up for detected device
 221  *      @pdev; PCI device detected
 222  *      @dev_idx: Device type index
 223  *
 224  *      We have found an AMD76x and now need to set up the memory
 225  *      controller status reporting. We configure and set up the
 226  *      memory controller reporting and claim the device.
 227  */
 228 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 229 {
 230         static const enum edac_type ems_modes[] = {
 231                 EDAC_NONE,
 232                 EDAC_EC,
 233                 EDAC_SECDED,
 234                 EDAC_SECDED
 235         };
 236         struct mem_ctl_info *mci;
 237         struct edac_mc_layer layers[2];
 238         u32 ems;
 239         u32 ems_mode;
 240         struct amd76x_error_info discard;
 241
 242         edac_dbg(0, "\n");
 243         pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
 244         ems_mode = (ems >> 10) & 0x3;
 245
 246         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 247         layers[0].size = AMD76X_NR_CSROWS;
 248         layers[0].is_virt_csrow = true;
 249         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 250         layers[1].size = 1;
 251         layers[1].is_virt_csrow = false;
 252         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
 253
 254         if (mci == NULL)
 255                 return -ENOMEM;
 256
 257         edac_dbg(0, "mci = %p\n", mci);
 258         mci->pdev = &pdev->dev;
 259         mci->mtype_cap = MEM_FLAG_RDDR;
 260         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 261         mci->edac_cap = ems_mode ?
 262                 (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
 263         mci->mod_name = EDAC_MOD_STR;
 264         mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
 265         mci->dev_name = pci_name(pdev);
 266         mci->edac_check = amd76x_check;
 267         mci->ctl_page_to_phys = NULL;
 268
 269         amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
 270         amd76x_get_error_info(mci, &discard);   /* clear counters */
 271
 272         /* Here we assume that we will never see multiple instances of this
 273          * type of memory controller.  The ID is therefore hardcoded to 0.
 274          */
 275         if (edac_mc_add_mc(mci)) {
 276                 edac_dbg(3, "failed edac_mc_add_mc()\n");
 277                 goto fail;
 278         }
 279
 280         /* allocating generic PCI control info */
 281         amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 282         if (!amd76x_pci) {
 283                 printk(KERN_WARNING
 284                         "%s(): Unable to create PCI control\n",
 285                         __func__);
 286                 printk(KERN_WARNING
 287                         "%s(): PCI error report via EDAC not setup\n",
 288                         __func__);
 289         }
 290
 291         /* get this far and it's successful */
 292         edac_dbg(3, "success\n");
 293         return 0;
 294
 295 fail:
 296         edac_mc_free(mci);
 297         return -ENODEV;
 298 }
 299
 300 /* returns count (>= 0), or negative on error */
 301 static int amd76x_init_one(struct pci_dev *pdev,
 302                            const struct pci_device_id *ent)
 303 {
 304         edac_dbg(0, "\n");
 305
 306         /* don't need to call pci_enable_device() */
 307         return amd76x_probe1(pdev, ent->driver_data);
 308 }
 309
 310 /**
 311  *      amd76x_remove_one       -       driver shutdown
 312  *      @pdev: PCI device being handed back
 313  *
 314  *      Called when the driver is unloaded. Find the matching mci
 315  *      structure for the device then delete the mci and free the
 316  *      resources.
 317  */
 318 static void amd76x_remove_one(struct pci_dev *pdev)
 319 {
 320         struct mem_ctl_info *mci;
 321
 322         edac_dbg(0, "\n");
 323
 324         if (amd76x_pci)
 325                 edac_pci_release_generic_ctl(amd76x_pci);
 326
 327         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 328                 return;
 329
 330         edac_mc_free(mci);
 331 }
 332
 333 static const struct pci_device_id amd76x_pci_tbl[] = {
 334         {
 335          PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 336          AMD762},
 337         {
 338          PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 339          AMD761},
 340         {
 341          0,
 342          }                      /* 0 terminated list. */
 343 };
 344
 345 MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
 346
 347 static struct pci_driver amd76x_driver = {
 348         .name = EDAC_MOD_STR,
 349         .probe = amd76x_init_one,
 350         .remove = amd76x_remove_one,
 351         .id_table = amd76x_pci_tbl,
 352 };
 353
 354 static int __init amd76x_init(void)
 355 {
 356        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 357        opstate_init();
 358
 359         return pci_register_driver(&amd76x_driver);
 360 }
 361
 362 static void __exit amd76x_exit(void)
 363 {
 364         pci_unregister_driver(&amd76x_driver);
 365 }
 366
 367 module_init(amd76x_init);
 368 module_exit(amd76x_exit);
 369
 370 MODULE_LICENSE("GPL");
 371 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 372 MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
 373
 374 module_param(edac_op_state, int, 0444);
 375 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");