drivers/edac/pasemi_edac.c

   1 /*
   2  * Copyright (C) 2006-2007 PA Semi, Inc
   3  *
   4  * Author: Egor Martovetsky <egor@pasemi.com>
   5  * Maintained by: Olof Johansson <olof@lixom.net>
   6  *
   7  * Driver for the PWRficient onchip memory controllers
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/pci.h>
  27 #include <linux/pci_ids.h>
  28 #include <linux/slab.h>
  29 #include "edac_core.h"
  30
  31 #define MODULE_NAME "pasemi_edac"
  32
  33 #define MCCFG_MCEN                              0x300
  34 #define   MCCFG_MCEN_MMC_EN                     0x00000001
  35 #define MCCFG_ERRCOR                            0x388
  36 #define   MCCFG_ERRCOR_RNK_FAIL_DET_EN          0x00000100
  37 #define   MCCFG_ERRCOR_ECC_GEN_EN               0x00000010
  38 #define   MCCFG_ERRCOR_ECC_CRR_EN               0x00000001
  39 #define MCCFG_SCRUB                             0x384
  40 #define   MCCFG_SCRUB_RGLR_SCRB_EN              0x00000001
  41 #define MCDEBUG_ERRCTL1                         0x728
  42 #define   MCDEBUG_ERRCTL1_RFL_LOG_EN            0x00080000
  43 #define   MCDEBUG_ERRCTL1_MBE_LOG_EN            0x00040000
  44 #define   MCDEBUG_ERRCTL1_SBE_LOG_EN            0x00020000
  45 #define MCDEBUG_ERRSTA                          0x730
  46 #define   MCDEBUG_ERRSTA_RFL_STATUS             0x00000004
  47 #define   MCDEBUG_ERRSTA_MBE_STATUS             0x00000002
  48 #define   MCDEBUG_ERRSTA_SBE_STATUS             0x00000001
  49 #define MCDEBUG_ERRCNT1                         0x734
  50 #define   MCDEBUG_ERRCNT1_SBE_CNT_OVRFLO        0x00000080
  51 #define MCDEBUG_ERRLOG1A                        0x738
  52 #define   MCDEBUG_ERRLOG1A_MERR_TYPE_M          0x30000000
  53 #define   MCDEBUG_ERRLOG1A_MERR_TYPE_NONE       0x00000000
  54 #define   MCDEBUG_ERRLOG1A_MERR_TYPE_SBE        0x10000000
  55 #define   MCDEBUG_ERRLOG1A_MERR_TYPE_MBE        0x20000000
  56 #define   MCDEBUG_ERRLOG1A_MERR_TYPE_RFL        0x30000000
  57 #define   MCDEBUG_ERRLOG1A_MERR_BA_M            0x00700000
  58 #define   MCDEBUG_ERRLOG1A_MERR_BA_S            20
  59 #define   MCDEBUG_ERRLOG1A_MERR_CS_M            0x00070000
  60 #define   MCDEBUG_ERRLOG1A_MERR_CS_S            16
  61 #define   MCDEBUG_ERRLOG1A_SYNDROME_M           0x0000ffff
  62 #define MCDRAM_RANKCFG                          0x114
  63 #define   MCDRAM_RANKCFG_EN                     0x00000001
  64 #define   MCDRAM_RANKCFG_TYPE_SIZE_M            0x000001c0
  65 #define   MCDRAM_RANKCFG_TYPE_SIZE_S            6
  66
  67 #define PASEMI_EDAC_NR_CSROWS                   8
  68 #define PASEMI_EDAC_NR_CHANS                    1
  69 #define PASEMI_EDAC_ERROR_GRAIN                 64
  70
  71 static int last_page_in_mmc;
  72 static int system_mmc_id;
  73
  74
  75 static u32 pasemi_edac_get_error_info(struct mem_ctl_info *mci)
  76 {
  77         struct pci_dev *pdev = to_pci_dev(mci->dev);
  78         u32 tmp;
  79
  80         pci_read_config_dword(pdev, MCDEBUG_ERRSTA,
  81                               &tmp);
  82
  83         tmp &= (MCDEBUG_ERRSTA_RFL_STATUS | MCDEBUG_ERRSTA_MBE_STATUS
  84                 | MCDEBUG_ERRSTA_SBE_STATUS);
  85
  86         if (tmp) {
  87                 if (tmp & MCDEBUG_ERRSTA_SBE_STATUS)
  88                         pci_write_config_dword(pdev, MCDEBUG_ERRCNT1,
  89                                                MCDEBUG_ERRCNT1_SBE_CNT_OVRFLO);
  90                 pci_write_config_dword(pdev, MCDEBUG_ERRSTA, tmp);
  91         }
  92
  93         return tmp;
  94 }
  95
  96 static void pasemi_edac_process_error_info(struct mem_ctl_info *mci, u32 errsta)
  97 {
  98         struct pci_dev *pdev = to_pci_dev(mci->dev);
  99         u32 errlog1a;
 100         u32 cs;
 101
 102         if (!errsta)
 103                 return;
 104
 105         pci_read_config_dword(pdev, MCDEBUG_ERRLOG1A, &errlog1a);
 106
 107         cs = (errlog1a & MCDEBUG_ERRLOG1A_MERR_CS_M) >>
 108                 MCDEBUG_ERRLOG1A_MERR_CS_S;
 109
 110         /* uncorrectable/multi-bit errors */
 111         if (errsta & (MCDEBUG_ERRSTA_MBE_STATUS |
 112                       MCDEBUG_ERRSTA_RFL_STATUS)) {
 113                 edac_mc_handle_ue(mci, mci->csrows[cs].first_page, 0,
 114                                   cs, mci->ctl_name);
 115         }
 116
 117         /* correctable/single-bit errors */
 118         if (errsta & MCDEBUG_ERRSTA_SBE_STATUS) {
 119                 edac_mc_handle_ce(mci, mci->csrows[cs].first_page, 0,
 120                                   0, cs, 0, mci->ctl_name);
 121         }
 122 }
 123
 124 static void pasemi_edac_check(struct mem_ctl_info *mci)
 125 {
 126         u32 errsta;
 127
 128         errsta = pasemi_edac_get_error_info(mci);
 129         if (errsta)
 130                 pasemi_edac_process_error_info(mci, errsta);
 131 }
 132
 133 static int pasemi_edac_init_csrows(struct mem_ctl_info *mci,
 134                                    struct pci_dev *pdev,
 135                                    enum edac_type edac_mode)
 136 {
 137         struct csrow_info *csrow;
 138         u32 rankcfg;
 139         int index;
 140
 141         for (index = 0; index < mci->nr_csrows; index++) {
 142                 csrow = &mci->csrows[index];
 143
 144                 pci_read_config_dword(pdev,
 145                                       MCDRAM_RANKCFG + (index * 12),
 146                                       &rankcfg);
 147
 148                 if (!(rankcfg & MCDRAM_RANKCFG_EN))
 149                         continue;
 150
 151                 switch ((rankcfg & MCDRAM_RANKCFG_TYPE_SIZE_M) >>
 152                         MCDRAM_RANKCFG_TYPE_SIZE_S) {
 153                 case 0:
 154                         csrow->nr_pages = 128 << (20 - PAGE_SHIFT);
 155                         break;
 156                 case 1:
 157                         csrow->nr_pages = 256 << (20 - PAGE_SHIFT);
 158                         break;
 159                 case 2:
 160                 case 3:
 161                         csrow->nr_pages = 512 << (20 - PAGE_SHIFT);
 162                         break;
 163                 case 4:
 164                         csrow->nr_pages = 1024 << (20 - PAGE_SHIFT);
 165                         break;
 166                 case 5:
 167                         csrow->nr_pages = 2048 << (20 - PAGE_SHIFT);
 168                         break;
 169                 default:
 170                         edac_mc_printk(mci, KERN_ERR,
 171                                 "Unrecognized Rank Config. rankcfg=%u\n",
 172                                 rankcfg);
 173                         return -EINVAL;
 174                 }
 175
 176                 csrow->first_page = last_page_in_mmc;
 177                 csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
 178                 last_page_in_mmc += csrow->nr_pages;
 179                 csrow->page_mask = 0;
 180                 csrow->grain = PASEMI_EDAC_ERROR_GRAIN;
 181                 csrow->mtype = MEM_DDR;
 182                 csrow->dtype = DEV_UNKNOWN;
 183                 csrow->edac_mode = edac_mode;
 184         }
 185         return 0;
 186 }
 187
 188 static int __devinit pasemi_edac_probe(struct pci_dev *pdev,
 189                 const struct pci_device_id *ent)
 190 {
 191         struct mem_ctl_info *mci = NULL;
 192         u32 errctl1, errcor, scrub, mcen;
 193
 194         pci_read_config_dword(pdev, MCCFG_MCEN, &mcen);
 195         if (!(mcen & MCCFG_MCEN_MMC_EN))
 196                 return -ENODEV;
 197
 198         /*
 199          * We should think about enabling other error detection later on
 200          */
 201
 202         pci_read_config_dword(pdev, MCDEBUG_ERRCTL1, &errctl1);
 203         errctl1 |= MCDEBUG_ERRCTL1_SBE_LOG_EN |
 204                 MCDEBUG_ERRCTL1_MBE_LOG_EN |
 205                 MCDEBUG_ERRCTL1_RFL_LOG_EN;
 206         pci_write_config_dword(pdev, MCDEBUG_ERRCTL1, errctl1);
 207
 208         mci = edac_mc_alloc(0, PASEMI_EDAC_NR_CSROWS, PASEMI_EDAC_NR_CHANS,
 209                                 system_mmc_id++);
 210
 211         if (mci == NULL)
 212                 return -ENOMEM;
 213
 214         pci_read_config_dword(pdev, MCCFG_ERRCOR, &errcor);
 215         errcor |= MCCFG_ERRCOR_RNK_FAIL_DET_EN |
 216                 MCCFG_ERRCOR_ECC_GEN_EN |
 217                 MCCFG_ERRCOR_ECC_CRR_EN;
 218
 219         mci->dev = &pdev->dev;
 220         mci->mtype_cap = MEM_FLAG_DDR | MEM_FLAG_RDDR;
 221         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 222         mci->edac_cap = (errcor & MCCFG_ERRCOR_ECC_GEN_EN) ?
 223                 ((errcor & MCCFG_ERRCOR_ECC_CRR_EN) ?
 224                  (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_EC) :
 225                 EDAC_FLAG_NONE;
 226         mci->mod_name = MODULE_NAME;
 227         mci->dev_name = pci_name(pdev);
 228         mci->ctl_name = "pasemi,1682m-mc";
 229         mci->edac_check = pasemi_edac_check;
 230         mci->ctl_page_to_phys = NULL;
 231         pci_read_config_dword(pdev, MCCFG_SCRUB, &scrub);
 232         mci->scrub_cap = SCRUB_FLAG_HW_PROG | SCRUB_FLAG_HW_SRC;
 233         mci->scrub_mode =
 234                 ((errcor & MCCFG_ERRCOR_ECC_CRR_EN) ? SCRUB_FLAG_HW_SRC : 0) |
 235                 ((scrub & MCCFG_SCRUB_RGLR_SCRB_EN) ? SCRUB_FLAG_HW_PROG : 0);
 236
 237         if (pasemi_edac_init_csrows(mci, pdev,
 238                                     (mci->edac_cap & EDAC_FLAG_SECDED) ?
 239                                     EDAC_SECDED :
 240                                     ((mci->edac_cap & EDAC_FLAG_EC) ?
 241                                      EDAC_EC : EDAC_NONE)))
 242                 goto fail;
 243
 244         /*
 245          * Clear status
 246          */
 247         pasemi_edac_get_error_info(mci);
 248
 249         if (edac_mc_add_mc(mci))
 250                 goto fail;
 251
 252         /* get this far and it's successful */
 253         return 0;
 254
 255 fail:
 256         edac_mc_free(mci);
 257         return -ENODEV;
 258 }
 259
 260 static void __devexit pasemi_edac_remove(struct pci_dev *pdev)
 261 {
 262         struct mem_ctl_info *mci = edac_mc_del_mc(&pdev->dev);
 263
 264         if (!mci)
 265                 return;
 266
 267         edac_mc_free(mci);
 268 }
 269
 270
 271 static const struct pci_device_id pasemi_edac_pci_tbl[] = {
 272         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa00a) },
 273         { }
 274 };
 275
 276 MODULE_DEVICE_TABLE(pci, pasemi_edac_pci_tbl);
 277
 278 static struct pci_driver pasemi_edac_driver = {
 279         .name = MODULE_NAME,
 280         .probe = pasemi_edac_probe,
 281         .remove = __devexit_p(pasemi_edac_remove),
 282         .id_table = pasemi_edac_pci_tbl,
 283 };
 284
 285 static int __init pasemi_edac_init(void)
 286 {
 287         return pci_register_driver(&pasemi_edac_driver);
 288 }
 289
 290 static void __exit pasemi_edac_exit(void)
 291 {
 292         pci_unregister_driver(&pasemi_edac_driver);
 293 }
 294
 295 module_init(pasemi_edac_init);
 296 module_exit(pasemi_edac_exit);
 297
 298 MODULE_LICENSE("GPL");
 299 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>");
 300 MODULE_DESCRIPTION("MC support for PA Semi PA6T-1682M memory controller");