drivers/edac/i82860_edac.c

   1 /*
   2  * Intel 82860 Memory Controller kernel module
   3  * (C) 2005 Red Hat (http://www.redhat.com)
   4  * This file may be distributed under the terms of the
   5  * GNU General Public License.
   6  *
   7  * Written by Ben Woodard <woodard@redhat.com>
   8  * shamelessly copied from and based upon the edac_i82875 driver
   9  * by Thayne Harbaugh of Linux Networx. (http://lnxi.com)
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/pci.h>
  15 #include <linux/pci_ids.h>
  16 #include <linux/slab.h>
  17 #include "edac_core.h"
  18
  19 #define  I82860_REVISION " Ver: 2.0.2 " __DATE__
  20 #define EDAC_MOD_STR    "i82860_edac"
  21
  22 #define i82860_printk(level, fmt, arg...) \
  23         edac_printk(level, "i82860", fmt, ##arg)
  24
  25 #define i82860_mc_printk(mci, level, fmt, arg...) \
  26         edac_mc_chipset_printk(mci, level, "i82860", fmt, ##arg)
  27
  28 #ifndef PCI_DEVICE_ID_INTEL_82860_0
  29 #define PCI_DEVICE_ID_INTEL_82860_0     0x2531
  30 #endif                          /* PCI_DEVICE_ID_INTEL_82860_0 */
  31
  32 #define I82860_MCHCFG 0x50
  33 #define I82860_GBA 0x60
  34 #define I82860_GBA_MASK 0x7FF
  35 #define I82860_GBA_SHIFT 24
  36 #define I82860_ERRSTS 0xC8
  37 #define I82860_EAP 0xE4
  38 #define I82860_DERRCTL_STS 0xE2
  39
  40 enum i82860_chips {
  41         I82860 = 0,
  42 };
  43
  44 struct i82860_dev_info {
  45         const char *ctl_name;
  46 };
  47
  48 struct i82860_error_info {
  49         u16 errsts;
  50         u32 eap;
  51         u16 derrsyn;
  52         u16 errsts2;
  53 };
  54
  55 static const struct i82860_dev_info i82860_devs[] = {
  56         [I82860] = {
  57                 .ctl_name = "i82860"},
  58 };
  59
  60 static struct pci_dev *mci_pdev;        /* init dev: in case that AGP code
  61                                          * has already registered driver
  62                                          */
  63 static struct edac_pci_ctl_info *i82860_pci;
  64
  65 static void i82860_get_error_info(struct mem_ctl_info *mci,
  66                                 struct i82860_error_info *info)
  67 {
  68         struct pci_dev *pdev;
  69
  70         pdev = to_pci_dev(mci->dev);
  71
  72         /*
  73          * This is a mess because there is no atomic way to read all the
  74          * registers at once and the registers can transition from CE being
  75          * overwritten by UE.
  76          */
  77         pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts);
  78         pci_read_config_dword(pdev, I82860_EAP, &info->eap);
  79         pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
  80         pci_read_config_word(pdev, I82860_ERRSTS, &info->errsts2);
  81
  82         pci_write_bits16(pdev, I82860_ERRSTS, 0x0003, 0x0003);
  83
  84         /*
  85          * If the error is the same for both reads then the first set of reads
  86          * is valid.  If there is a change then there is a CE no info and the
  87          * second set of reads is valid and should be UE info.
  88          */
  89         if (!(info->errsts2 & 0x0003))
  90                 return;
  91
  92         if ((info->errsts ^ info->errsts2) & 0x0003) {
  93                 pci_read_config_dword(pdev, I82860_EAP, &info->eap);
  94                 pci_read_config_word(pdev, I82860_DERRCTL_STS, &info->derrsyn);
  95         }
  96 }
  97
  98 static int i82860_process_error_info(struct mem_ctl_info *mci,
  99                                 struct i82860_error_info *info,
 100                                 int handle_errors)
 101 {
 102         int row;
 103
 104         if (!(info->errsts2 & 0x0003))
 105                 return 0;
 106
 107         if (!handle_errors)
 108                 return 1;
 109
 110         if ((info->errsts ^ info->errsts2) & 0x0003) {
 111                 edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
 112                 info->errsts = info->errsts2;
 113         }
 114
 115         info->eap >>= PAGE_SHIFT;
 116         row = edac_mc_find_csrow_by_page(mci, info->eap);
 117
 118         if (info->errsts & 0x0002)
 119                 edac_mc_handle_ue(mci, info->eap, 0, row, "i82860 UE");
 120         else
 121                 edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row, 0,
 122                                 "i82860 UE");
 123
 124         return 1;
 125 }
 126
 127 static void i82860_check(struct mem_ctl_info *mci)
 128 {
 129         struct i82860_error_info info;
 130
 131         debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
 132         i82860_get_error_info(mci, &info);
 133         i82860_process_error_info(mci, &info, 1);
 134 }
 135
 136 static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev)
 137 {
 138         unsigned long last_cumul_size;
 139         u16 mchcfg_ddim;        /* DRAM Data Integrity Mode 0=none, 2=edac */
 140         u16 value;
 141         u32 cumul_size;
 142         struct csrow_info *csrow;
 143         int index;
 144
 145         pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim);
 146         mchcfg_ddim = mchcfg_ddim & 0x180;
 147         last_cumul_size = 0;
 148
 149         /* The group row boundary (GRA) reg values are boundary address
 150          * for each DRAM row with a granularity of 16MB.  GRA regs are
 151          * cumulative; therefore GRA15 will contain the total memory contained
 152          * in all eight rows.
 153          */
 154         for (index = 0; index < mci->nr_csrows; index++) {
 155                 csrow = &mci->csrows[index];
 156                 pci_read_config_word(pdev, I82860_GBA + index * 2, &value);
 157                 cumul_size = (value & I82860_GBA_MASK) <<
 158                         (I82860_GBA_SHIFT - PAGE_SHIFT);
 159                 debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
 160                         cumul_size);
 161
 162                 if (cumul_size == last_cumul_size)
 163                         continue;       /* not populated */
 164
 165                 csrow->first_page = last_cumul_size;
 166                 csrow->last_page = cumul_size - 1;
 167                 csrow->nr_pages = cumul_size - last_cumul_size;
 168                 last_cumul_size = cumul_size;
 169                 csrow->grain = 1 << 12; /* I82860_EAP has 4KiB reolution */
 170                 csrow->mtype = MEM_RMBS;
 171                 csrow->dtype = DEV_UNKNOWN;
 172                 csrow->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
 173         }
 174 }
 175
 176 static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
 177 {
 178         struct mem_ctl_info *mci;
 179         struct i82860_error_info discard;
 180
 181         /* RDRAM has channels but these don't map onto the abstractions that
 182            edac uses.
 183            The device groups from the GRA registers seem to map reasonably
 184            well onto the notion of a chip select row.
 185            There are 16 GRA registers and since the name is associated with
 186            the channel and the GRA registers map to physical devices so we are
 187            going to make 1 channel for group.
 188          */
 189         mci = edac_mc_alloc(0, 16, 1, 0);
 190
 191         if (!mci)
 192                 return -ENOMEM;
 193
 194         debugf3("%s(): init mci\n", __func__);
 195         mci->dev = &pdev->dev;
 196         mci->mtype_cap = MEM_FLAG_DDR;
 197         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 198         /* I"m not sure about this but I think that all RDRAM is SECDED */
 199         mci->edac_cap = EDAC_FLAG_SECDED;
 200         mci->mod_name = EDAC_MOD_STR;
 201         mci->mod_ver = I82860_REVISION;
 202         mci->ctl_name = i82860_devs[dev_idx].ctl_name;
 203         mci->dev_name = pci_name(pdev);
 204         mci->edac_check = i82860_check;
 205         mci->ctl_page_to_phys = NULL;
 206         i82860_init_csrows(mci, pdev);
 207         i82860_get_error_info(mci, &discard);   /* clear counters */
 208
 209         /* Here we assume that we will never see multiple instances of this
 210          * type of memory controller.  The ID is therefore hardcoded to 0.
 211          */
 212         if (edac_mc_add_mc(mci)) {
 213                 debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
 214                 goto fail;
 215         }
 216
 217         /* allocating generic PCI control info */
 218         i82860_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 219         if (!i82860_pci) {
 220                 printk(KERN_WARNING
 221                         "%s(): Unable to create PCI control\n",
 222                         __func__);
 223                 printk(KERN_WARNING
 224                         "%s(): PCI error report via EDAC not setup\n",
 225                         __func__);
 226         }
 227
 228         /* get this far and it's successful */
 229         debugf3("%s(): success\n", __func__);
 230
 231         return 0;
 232
 233 fail:
 234         edac_mc_free(mci);
 235         return -ENODEV;
 236 }
 237
 238 /* returns count (>= 0), or negative on error */
 239 static int __devinit i82860_init_one(struct pci_dev *pdev,
 240                                 const struct pci_device_id *ent)
 241 {
 242         int rc;
 243
 244         debugf0("%s()\n", __func__);
 245         i82860_printk(KERN_INFO, "i82860 init one\n");
 246
 247         if (pci_enable_device(pdev) < 0)
 248                 return -EIO;
 249
 250         rc = i82860_probe1(pdev, ent->driver_data);
 251
 252         if (rc == 0)
 253                 mci_pdev = pci_dev_get(pdev);
 254
 255         return rc;
 256 }
 257
 258 static void __devexit i82860_remove_one(struct pci_dev *pdev)
 259 {
 260         struct mem_ctl_info *mci;
 261
 262         debugf0("%s()\n", __func__);
 263
 264         if (i82860_pci)
 265                 edac_pci_release_generic_ctl(i82860_pci);
 266
 267         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 268                 return;
 269
 270         edac_mc_free(mci);
 271 }
 272
 273 static const struct pci_device_id i82860_pci_tbl[] __devinitdata = {
 274         {
 275          PCI_VEND_DEV(INTEL, 82860_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 276          I82860},
 277         {
 278          0,
 279          }                      /* 0 terminated list. */
 280 };
 281
 282 MODULE_DEVICE_TABLE(pci, i82860_pci_tbl);
 283
 284 static struct pci_driver i82860_driver = {
 285         .name = EDAC_MOD_STR,
 286         .probe = i82860_init_one,
 287         .remove = __devexit_p(i82860_remove_one),
 288         .id_table = i82860_pci_tbl,
 289 };
 290
 291 static int __init i82860_init(void)
 292 {
 293         int pci_rc;
 294
 295         debugf3("%s()\n", __func__);
 296
 297         if ((pci_rc = pci_register_driver(&i82860_driver)) < 0)
 298                 goto fail0;
 299
 300         if (!mci_pdev) {
 301                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 302                                         PCI_DEVICE_ID_INTEL_82860_0, NULL);
 303
 304                 if (mci_pdev == NULL) {
 305                         debugf0("860 pci_get_device fail\n");
 306                         pci_rc = -ENODEV;
 307                         goto fail1;
 308                 }
 309
 310                 pci_rc = i82860_init_one(mci_pdev, i82860_pci_tbl);
 311
 312                 if (pci_rc < 0) {
 313                         debugf0("860 init fail\n");
 314                         pci_rc = -ENODEV;
 315                         goto fail1;
 316                 }
 317         }
 318
 319         return 0;
 320
 321 fail1:
 322         pci_unregister_driver(&i82860_driver);
 323
 324 fail0:
 325         if (mci_pdev != NULL)
 326                 pci_dev_put(mci_pdev);
 327
 328         return pci_rc;
 329 }
 330
 331 static void __exit i82860_exit(void)
 332 {
 333         debugf3("%s()\n", __func__);
 334
 335         pci_unregister_driver(&i82860_driver);
 336
 337         if (mci_pdev != NULL)
 338                 pci_dev_put(mci_pdev);
 339 }
 340
 341 module_init(i82860_init);
 342 module_exit(i82860_exit);
 343
 344 MODULE_LICENSE("GPL");
 345 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com) "
 346                 "Ben Woodard <woodard@redhat.com>");
 347 MODULE_DESCRIPTION("ECC support for Intel 82860 memory hub controllers");