LXR linux/drivers/edac/amd76x

   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
  72struct amd76x_error_info {
  73        u32 ecc_mode_status;
  74};
  75
  76enum amd76x_chips {
  77        AMD761 = 0,
  78        AMD762
  79};
  80
  81struct amd76x_dev_info {
  82        const char *ctl_name;
  83};
  84
  85static const struct amd76x_dev_info amd76x_devs[] = {
  86        [AMD761] = {
  87                .ctl_name = "AMD761"},
  88        [AMD762] = {
  89                .ctl_name = "AMD762"},
  90};
  91
  92static 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 */
 102static 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 */
 130static 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 */
 179static void amd76x_check(struct mem_ctl_info *mci)
 180{
 181        struct amd76x_error_info info;
 182        edac_dbg(3, "\n");
 183        amd76x_get_error_info(mci, &info);
 184        amd76x_process_error_info(mci, &info, 1);
 185}
 186
 187static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
 188                        enum edac_type edac_mode)
 189{
 190        struct csrow_info *csrow;
 191        struct dimm_info *dimm;
 192        u32 mba, mba_base, mba_mask, dms;
 193        int index;
 194
 195        for (index = 0; index < mci->nr_csrows; index++) {
 196                csrow = mci->csrows[index];
 197                dimm = csrow->channels[0]->dimm;
 198
 199                /* find the DRAM Chip Select Base address and mask */
 200                pci_read_config_dword(pdev,
 201                                AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
 202
 203                if (!(mba & BIT(0)))
 204                        continue;
 205
 206                mba_base = mba & 0xff800000UL;
 207                mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
 208                pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
 209                csrow->first_page = mba_base >> PAGE_SHIFT;
 210                dimm->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
 211                csrow->last_page = csrow->first_page + dimm->nr_pages - 1;
 212                csrow->page_mask = mba_mask >> PAGE_SHIFT;
 213                dimm->grain = dimm->nr_pages << PAGE_SHIFT;
 214                dimm->mtype = MEM_RDDR;
 215                dimm->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
 216                dimm->edac_mode = edac_mode;
 217        }
 218}
 219
 220/**
 221 *      amd76x_probe1   -       Perform set up for detected device
 222 *      @pdev; PCI device detected
 223 *      @dev_idx: Device type index
 224 *
 225 *      We have found an AMD76x and now need to set up the memory
 226 *      controller status reporting. We configure and set up the
 227 *      memory controller reporting and claim the device.
 228 */
 229static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 230{
 231        static const enum edac_type ems_modes[] = {
 232                EDAC_NONE,
 233                EDAC_EC,
 234                EDAC_SECDED,
 235                EDAC_SECDED
 236        };
 237        struct mem_ctl_info *mci;
 238        struct edac_mc_layer layers[2];
 239        u32 ems;
 240        u32 ems_mode;
 241        struct amd76x_error_info discard;
 242
 243        edac_dbg(0, "\n");
 244        pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
 245        ems_mode = (ems >> 10) & 0x3;
 246
 247        layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 248        layers[0].size = AMD76X_NR_CSROWS;
 249        layers[0].is_virt_csrow = true;
 250        layers[1].type = EDAC_MC_LAYER_CHANNEL;
 251        layers[1].size = 1;
 252        layers[1].is_virt_csrow = false;
 253        mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
 254
 255        if (mci == NULL)
 256                return -ENOMEM;
 257
 258        edac_dbg(0, "mci = %p\n", mci);
 259        mci->pdev = &pdev->dev;
 260        mci->mtype_cap = MEM_FLAG_RDDR;
 261        mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 262        mci->edac_cap = ems_mode ?
 263                (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
 264        mci->mod_name = EDAC_MOD_STR;
 265        mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
 266        mci->dev_name = pci_name(pdev);
 267        mci->edac_check = amd76x_check;
 268        mci->ctl_page_to_phys = NULL;
 269
 270        amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
 271        amd76x_get_error_info(mci, &discard);   /* clear counters */
 272
 273        /* Here we assume that we will never see multiple instances of this
 274         * type of memory controller.  The ID is therefore hardcoded to 0.
 275         */
 276        if (edac_mc_add_mc(mci)) {
 277                edac_dbg(3, "failed edac_mc_add_mc()\n");
 278                goto fail;
 279        }
 280
 281        /* allocating generic PCI control info */
 282        amd76x_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 283        if (!amd76x_pci) {
 284                printk(KERN_WARNING
 285                        "%s(): Unable to create PCI control\n",
 286                        __func__);
 287                printk(KERN_WARNING
 288                        "%s(): PCI error report via EDAC not setup\n",
 289                        __func__);
 290        }
 291
 292        /* get this far and it's successful */
 293        edac_dbg(3, "success\n");
 294        return 0;
 295
 296fail:
 297        edac_mc_free(mci);
 298        return -ENODEV;
 299}
 300
 301/* returns count (>= 0), or negative on error */
 302static int amd76x_init_one(struct pci_dev *pdev,
 303                           const struct pci_device_id *ent)
 304{
 305        edac_dbg(0, "\n");
 306
 307        /* don't need to call pci_enable_device() */
 308        return amd76x_probe1(pdev, ent->driver_data);
 309}
 310
 311/**
 312 *      amd76x_remove_one       -       driver shutdown
 313 *      @pdev: PCI device being handed back
 314 *
 315 *      Called when the driver is unloaded. Find the matching mci
 316 *      structure for the device then delete the mci and free the
 317 *      resources.
 318 */
 319static void amd76x_remove_one(struct pci_dev *pdev)
 320{
 321        struct mem_ctl_info *mci;
 322
 323        edac_dbg(0, "\n");
 324
 325        if (amd76x_pci)
 326                edac_pci_release_generic_ctl(amd76x_pci);
 327
 328        if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 329                return;
 330
 331        edac_mc_free(mci);
 332}
 333
 334static const struct pci_device_id amd76x_pci_tbl[] = {
 335        {
 336         PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 337         AMD762},
 338        {
 339         PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 340         AMD761},
 341        {
 342         0,
 343         }                      /* 0 terminated list. */
 344};
 345
 346MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);
 347
 348static struct pci_driver amd76x_driver = {
 349        .name = EDAC_MOD_STR,
 350        .probe = amd76x_init_one,
 351        .remove = amd76x_remove_one,
 352        .id_table = amd76x_pci_tbl,
 353};
 354
 355static int __init amd76x_init(void)
 356{
 357       /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 358       opstate_init();
 359
 360        return pci_register_driver(&amd76x_driver);
 361}
 362
 363static void __exit amd76x_exit(void)
 364{
 365        pci_unregister_driver(&amd76x_driver);
 366}
 367
 368module_init(amd76x_init);
 369module_exit(amd76x_exit);
 370
 371MODULE_LICENSE("GPL");
 372MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 373MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
 374
 375module_param(edac_op_state, int, 0444);
 376MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");
 377