drivers/edac/amd8131_edac.c

   1 /*
   2  * amd8131_edac.c, AMD8131 hypertransport chip EDAC kernel module
   3  *
   4  * Copyright (c) 2008 Wind River Systems, Inc.
   5  *
   6  * Authors:     Cao Qingtao <qingtao.cao@windriver.com>
   7  *              Benjamin Walsh <benjamin.walsh@windriver.com>
   8  *              Hu Yongqi <yongqi.hu@windriver.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17  * See the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/io.h>
  28 #include <linux/bitops.h>
  29 #include <linux/edac.h>
  30 #include <linux/pci_ids.h>
  31
  32 #include "edac_module.h"
  33 #include "amd8131_edac.h"
  34
  35 #define AMD8131_EDAC_REVISION   " Ver: 1.0.0"
  36 #define AMD8131_EDAC_MOD_STR    "amd8131_edac"
  37
  38 /* Wrapper functions for accessing PCI configuration space */
  39 static void edac_pci_read_dword(struct pci_dev *dev, int reg, u32 *val32)
  40 {
  41         int ret;
  42
  43         ret = pci_read_config_dword(dev, reg, val32);
  44         if (ret != 0)
  45                 printk(KERN_ERR AMD8131_EDAC_MOD_STR
  46                         " PCI Access Read Error at 0x%x\n", reg);
  47 }
  48
  49 static void edac_pci_write_dword(struct pci_dev *dev, int reg, u32 val32)
  50 {
  51         int ret;
  52
  53         ret = pci_write_config_dword(dev, reg, val32);
  54         if (ret != 0)
  55                 printk(KERN_ERR AMD8131_EDAC_MOD_STR
  56                         " PCI Access Write Error at 0x%x\n", reg);
  57 }
  58
  59 static char * const bridge_str[] = {
  60         [NORTH_A] = "NORTH A",
  61         [NORTH_B] = "NORTH B",
  62         [SOUTH_A] = "SOUTH A",
  63         [SOUTH_B] = "SOUTH B",
  64         [NO_BRIDGE] = "NO BRIDGE",
  65 };
  66
  67 /* Support up to two AMD8131 chipsets on a platform */
  68 static struct amd8131_dev_info amd8131_devices[] = {
  69         {
  70         .inst = NORTH_A,
  71         .devfn = DEVFN_PCIX_BRIDGE_NORTH_A,
  72         .ctl_name = "AMD8131_PCIX_NORTH_A",
  73         },
  74         {
  75         .inst = NORTH_B,
  76         .devfn = DEVFN_PCIX_BRIDGE_NORTH_B,
  77         .ctl_name = "AMD8131_PCIX_NORTH_B",
  78         },
  79         {
  80         .inst = SOUTH_A,
  81         .devfn = DEVFN_PCIX_BRIDGE_SOUTH_A,
  82         .ctl_name = "AMD8131_PCIX_SOUTH_A",
  83         },
  84         {
  85         .inst = SOUTH_B,
  86         .devfn = DEVFN_PCIX_BRIDGE_SOUTH_B,
  87         .ctl_name = "AMD8131_PCIX_SOUTH_B",
  88         },
  89         {.inst = NO_BRIDGE,},
  90 };
  91
  92 static void amd8131_pcix_init(struct amd8131_dev_info *dev_info)
  93 {
  94         u32 val32;
  95         struct pci_dev *dev = dev_info->dev;
  96
  97         /* First clear error detection flags */
  98         edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
  99         if (val32 & MEM_LIMIT_MASK)
 100                 edac_pci_write_dword(dev, REG_MEM_LIM, val32);
 101
 102         /* Clear Discard Timer Timedout flag */
 103         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 104         if (val32 & INT_CTLR_DTS)
 105                 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 106
 107         /* Clear CRC Error flag on link side A */
 108         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 109         if (val32 & LNK_CTRL_CRCERR_A)
 110                 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 111
 112         /* Clear CRC Error flag on link side B */
 113         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 114         if (val32 & LNK_CTRL_CRCERR_B)
 115                 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 116
 117         /*
 118          * Then enable all error detections.
 119          *
 120          * Setup Discard Timer Sync Flood Enable,
 121          * System Error Enable and Parity Error Enable.
 122          */
 123         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 124         val32 |= INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE;
 125         edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 126
 127         /* Enable overall SERR Error detection */
 128         edac_pci_read_dword(dev, REG_STS_CMD, &val32);
 129         val32 |= STS_CMD_SERREN;
 130         edac_pci_write_dword(dev, REG_STS_CMD, val32);
 131
 132         /* Setup CRC Flood Enable for link side A */
 133         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 134         val32 |= LNK_CTRL_CRCFEN;
 135         edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 136
 137         /* Setup CRC Flood Enable for link side B */
 138         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 139         val32 |= LNK_CTRL_CRCFEN;
 140         edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 141 }
 142
 143 static void amd8131_pcix_exit(struct amd8131_dev_info *dev_info)
 144 {
 145         u32 val32;
 146         struct pci_dev *dev = dev_info->dev;
 147
 148         /* Disable SERR, PERR and DTSE Error detection */
 149         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 150         val32 &= ~(INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE);
 151         edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 152
 153         /* Disable overall System Error detection */
 154         edac_pci_read_dword(dev, REG_STS_CMD, &val32);
 155         val32 &= ~STS_CMD_SERREN;
 156         edac_pci_write_dword(dev, REG_STS_CMD, val32);
 157
 158         /* Disable CRC Sync Flood on link side A */
 159         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 160         val32 &= ~LNK_CTRL_CRCFEN;
 161         edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 162
 163         /* Disable CRC Sync Flood on link side B */
 164         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 165         val32 &= ~LNK_CTRL_CRCFEN;
 166         edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 167 }
 168
 169 static void amd8131_pcix_check(struct edac_pci_ctl_info *edac_dev)
 170 {
 171         struct amd8131_dev_info *dev_info = edac_dev->pvt_info;
 172         struct pci_dev *dev = dev_info->dev;
 173         u32 val32;
 174
 175         /* Check PCI-X Bridge Memory Base-Limit Register for errors */
 176         edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
 177         if (val32 & MEM_LIMIT_MASK) {
 178                 printk(KERN_INFO "Error(s) in mem limit register "
 179                         "on %s bridge\n", dev_info->ctl_name);
 180                 printk(KERN_INFO "DPE: %d, RSE: %d, RMA: %d\n"
 181                         "RTA: %d, STA: %d, MDPE: %d\n",
 182                         val32 & MEM_LIMIT_DPE,
 183                         val32 & MEM_LIMIT_RSE,
 184                         val32 & MEM_LIMIT_RMA,
 185                         val32 & MEM_LIMIT_RTA,
 186                         val32 & MEM_LIMIT_STA,
 187                         val32 & MEM_LIMIT_MDPE);
 188
 189                 val32 |= MEM_LIMIT_MASK;
 190                 edac_pci_write_dword(dev, REG_MEM_LIM, val32);
 191
 192                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 193         }
 194
 195         /* Check if Discard Timer timed out */
 196         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 197         if (val32 & INT_CTLR_DTS) {
 198                 printk(KERN_INFO "Error(s) in interrupt and control register "
 199                         "on %s bridge\n", dev_info->ctl_name);
 200                 printk(KERN_INFO "DTS: %d\n", val32 & INT_CTLR_DTS);
 201
 202                 val32 |= INT_CTLR_DTS;
 203                 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 204
 205                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 206         }
 207
 208         /* Check if CRC error happens on link side A */
 209         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 210         if (val32 & LNK_CTRL_CRCERR_A) {
 211                 printk(KERN_INFO "Error(s) in link conf and control register "
 212                         "on %s bridge\n", dev_info->ctl_name);
 213                 printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_A);
 214
 215                 val32 |= LNK_CTRL_CRCERR_A;
 216                 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 217
 218                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 219         }
 220
 221         /* Check if CRC error happens on link side B */
 222         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 223         if (val32 & LNK_CTRL_CRCERR_B) {
 224                 printk(KERN_INFO "Error(s) in link conf and control register "
 225                         "on %s bridge\n", dev_info->ctl_name);
 226                 printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_B);
 227
 228                 val32 |= LNK_CTRL_CRCERR_B;
 229                 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 230
 231                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 232         }
 233 }
 234
 235 static struct amd8131_info amd8131_chipset = {
 236         .err_dev = PCI_DEVICE_ID_AMD_8131_APIC,
 237         .devices = amd8131_devices,
 238         .init = amd8131_pcix_init,
 239         .exit = amd8131_pcix_exit,
 240         .check = amd8131_pcix_check,
 241 };
 242
 243 /*
 244  * There are 4 PCIX Bridges on ATCA-6101 that share the same PCI Device ID,
 245  * so amd8131_probe() would be called by kernel 4 times, with different
 246  * address of pci_dev for each of them each time.
 247  */
 248 static int amd8131_probe(struct pci_dev *dev, const struct pci_device_id *id)
 249 {
 250         struct amd8131_dev_info *dev_info;
 251
 252         for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
 253                 dev_info++)
 254                 if (dev_info->devfn == dev->devfn)
 255                         break;
 256
 257         if (dev_info->inst == NO_BRIDGE) /* should never happen */
 258                 return -ENODEV;
 259
 260         /*
 261          * We can't call pci_get_device() as we are used to do because
 262          * there are 4 of them but pci_dev_get() instead.
 263          */
 264         dev_info->dev = pci_dev_get(dev);
 265
 266         if (pci_enable_device(dev_info->dev)) {
 267                 pci_dev_put(dev_info->dev);
 268                 printk(KERN_ERR "failed to enable:"
 269                         "vendor %x, device %x, devfn %x, name %s\n",
 270                         PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
 271                         dev_info->devfn, dev_info->ctl_name);
 272                 return -ENODEV;
 273         }
 274
 275         /*
 276          * we do not allocate extra private structure for
 277          * edac_pci_ctl_info, but make use of existing
 278          * one instead.
 279          */
 280         dev_info->edac_idx = edac_pci_alloc_index();
 281         dev_info->edac_dev = edac_pci_alloc_ctl_info(0, dev_info->ctl_name);
 282         if (!dev_info->edac_dev)
 283                 return -ENOMEM;
 284
 285         dev_info->edac_dev->pvt_info = dev_info;
 286         dev_info->edac_dev->dev = &dev_info->dev->dev;
 287         dev_info->edac_dev->mod_name = AMD8131_EDAC_MOD_STR;
 288         dev_info->edac_dev->ctl_name = dev_info->ctl_name;
 289         dev_info->edac_dev->dev_name = dev_name(&dev_info->dev->dev);
 290
 291         if (edac_op_state == EDAC_OPSTATE_POLL)
 292                 dev_info->edac_dev->edac_check = amd8131_chipset.check;
 293
 294         if (amd8131_chipset.init)
 295                 amd8131_chipset.init(dev_info);
 296
 297         if (edac_pci_add_device(dev_info->edac_dev, dev_info->edac_idx) > 0) {
 298                 printk(KERN_ERR "failed edac_pci_add_device() for %s\n",
 299                         dev_info->ctl_name);
 300                 edac_pci_free_ctl_info(dev_info->edac_dev);
 301                 return -ENODEV;
 302         }
 303
 304         printk(KERN_INFO "added one device on AMD8131 "
 305                 "vendor %x, device %x, devfn %x, name %s\n",
 306                 PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
 307                 dev_info->devfn, dev_info->ctl_name);
 308
 309         return 0;
 310 }
 311
 312 static void amd8131_remove(struct pci_dev *dev)
 313 {
 314         struct amd8131_dev_info *dev_info;
 315
 316         for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
 317                 dev_info++)
 318                 if (dev_info->devfn == dev->devfn)
 319                         break;
 320
 321         if (dev_info->inst == NO_BRIDGE) /* should never happen */
 322                 return;
 323
 324         if (dev_info->edac_dev) {
 325                 edac_pci_del_device(dev_info->edac_dev->dev);
 326                 edac_pci_free_ctl_info(dev_info->edac_dev);
 327         }
 328
 329         if (amd8131_chipset.exit)
 330                 amd8131_chipset.exit(dev_info);
 331
 332         pci_dev_put(dev_info->dev);
 333 }
 334
 335 static const struct pci_device_id amd8131_edac_pci_tbl[] = {
 336         {
 337         PCI_VEND_DEV(AMD, 8131_BRIDGE),
 338         .subvendor = PCI_ANY_ID,
 339         .subdevice = PCI_ANY_ID,
 340         .class = 0,
 341         .class_mask = 0,
 342         .driver_data = 0,
 343         },
 344         {
 345         0,
 346         }                       /* table is NULL-terminated */
 347 };
 348 MODULE_DEVICE_TABLE(pci, amd8131_edac_pci_tbl);
 349
 350 static struct pci_driver amd8131_edac_driver = {
 351         .name = AMD8131_EDAC_MOD_STR,
 352         .probe = amd8131_probe,
 353         .remove = amd8131_remove,
 354         .id_table = amd8131_edac_pci_tbl,
 355 };
 356
 357 static int __init amd8131_edac_init(void)
 358 {
 359         printk(KERN_INFO "AMD8131 EDAC driver " AMD8131_EDAC_REVISION "\n");
 360         printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc.\n");
 361
 362         /* Only POLL mode supported so far */
 363         edac_op_state = EDAC_OPSTATE_POLL;
 364
 365         return pci_register_driver(&amd8131_edac_driver);
 366 }
 367
 368 static void __exit amd8131_edac_exit(void)
 369 {
 370         pci_unregister_driver(&amd8131_edac_driver);
 371 }
 372
 373 module_init(amd8131_edac_init);
 374 module_exit(amd8131_edac_exit);
 375
 376 MODULE_LICENSE("GPL");
 377 MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>\n");
 378 MODULE_DESCRIPTION("AMD8131 HyperTransport PCI-X Tunnel EDAC kernel module");