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