drivers/edac/amd8131_edac.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * amd8131_edac.c, AMD8131 hypertransport chip EDAC kernel module
   4  *
   5  * Copyright (c) 2008 Wind River Systems, Inc.
   6  *
   7  * Authors:     Cao Qingtao <qingtao.cao@windriver.com>
   8  *              Benjamin Walsh <benjamin.walsh@windriver.com>
   9  *              Hu Yongqi <yongqi.hu@windriver.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/io.h>
  16 #include <linux/bitops.h>
  17 #include <linux/edac.h>
  18 #include <linux/pci_ids.h>
  19
  20 #include "edac_module.h"
  21 #include "amd8131_edac.h"
  22
  23 #define AMD8131_EDAC_REVISION   " Ver: 1.0.0"
  24 #define AMD8131_EDAC_MOD_STR    "amd8131_edac"
  25
  26 /* Wrapper functions for accessing PCI configuration space */
  27 static void edac_pci_read_dword(struct pci_dev *dev, int reg, u32 *val32)
  28 {
  29         int ret;
  30
  31         ret = pci_read_config_dword(dev, reg, val32);
  32         if (ret != 0)
  33                 printk(KERN_ERR AMD8131_EDAC_MOD_STR
  34                         " PCI Access Read Error at 0x%x\n", reg);
  35 }
  36
  37 static void edac_pci_write_dword(struct pci_dev *dev, int reg, u32 val32)
  38 {
  39         int ret;
  40
  41         ret = pci_write_config_dword(dev, reg, val32);
  42         if (ret != 0)
  43                 printk(KERN_ERR AMD8131_EDAC_MOD_STR
  44                         " PCI Access Write Error at 0x%x\n", reg);
  45 }
  46
  47 /* Support up to two AMD8131 chipsets on a platform */
  48 static struct amd8131_dev_info amd8131_devices[] = {
  49         {
  50         .inst = NORTH_A,
  51         .devfn = DEVFN_PCIX_BRIDGE_NORTH_A,
  52         .ctl_name = "AMD8131_PCIX_NORTH_A",
  53         },
  54         {
  55         .inst = NORTH_B,
  56         .devfn = DEVFN_PCIX_BRIDGE_NORTH_B,
  57         .ctl_name = "AMD8131_PCIX_NORTH_B",
  58         },
  59         {
  60         .inst = SOUTH_A,
  61         .devfn = DEVFN_PCIX_BRIDGE_SOUTH_A,
  62         .ctl_name = "AMD8131_PCIX_SOUTH_A",
  63         },
  64         {
  65         .inst = SOUTH_B,
  66         .devfn = DEVFN_PCIX_BRIDGE_SOUTH_B,
  67         .ctl_name = "AMD8131_PCIX_SOUTH_B",
  68         },
  69         {.inst = NO_BRIDGE,},
  70 };
  71
  72 static void amd8131_pcix_init(struct amd8131_dev_info *dev_info)
  73 {
  74         u32 val32;
  75         struct pci_dev *dev = dev_info->dev;
  76
  77         /* First clear error detection flags */
  78         edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
  79         if (val32 & MEM_LIMIT_MASK)
  80                 edac_pci_write_dword(dev, REG_MEM_LIM, val32);
  81
  82         /* Clear Discard Timer Timedout flag */
  83         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
  84         if (val32 & INT_CTLR_DTS)
  85                 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
  86
  87         /* Clear CRC Error flag on link side A */
  88         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
  89         if (val32 & LNK_CTRL_CRCERR_A)
  90                 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
  91
  92         /* Clear CRC Error flag on link side B */
  93         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
  94         if (val32 & LNK_CTRL_CRCERR_B)
  95                 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
  96
  97         /*
  98          * Then enable all error detections.
  99          *
 100          * Setup Discard Timer Sync Flood Enable,
 101          * System Error Enable and Parity Error Enable.
 102          */
 103         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 104         val32 |= INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE;
 105         edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 106
 107         /* Enable overall SERR Error detection */
 108         edac_pci_read_dword(dev, REG_STS_CMD, &val32);
 109         val32 |= STS_CMD_SERREN;
 110         edac_pci_write_dword(dev, REG_STS_CMD, val32);
 111
 112         /* Setup CRC Flood Enable for link side A */
 113         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 114         val32 |= LNK_CTRL_CRCFEN;
 115         edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 116
 117         /* Setup CRC Flood Enable for link side B */
 118         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 119         val32 |= LNK_CTRL_CRCFEN;
 120         edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 121 }
 122
 123 static void amd8131_pcix_exit(struct amd8131_dev_info *dev_info)
 124 {
 125         u32 val32;
 126         struct pci_dev *dev = dev_info->dev;
 127
 128         /* Disable SERR, PERR and DTSE Error detection */
 129         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 130         val32 &= ~(INT_CTLR_PERR | INT_CTLR_SERR | INT_CTLR_DTSE);
 131         edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 132
 133         /* Disable overall System Error detection */
 134         edac_pci_read_dword(dev, REG_STS_CMD, &val32);
 135         val32 &= ~STS_CMD_SERREN;
 136         edac_pci_write_dword(dev, REG_STS_CMD, val32);
 137
 138         /* Disable CRC Sync Flood on link side A */
 139         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 140         val32 &= ~LNK_CTRL_CRCFEN;
 141         edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 142
 143         /* Disable CRC Sync Flood on link side B */
 144         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 145         val32 &= ~LNK_CTRL_CRCFEN;
 146         edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 147 }
 148
 149 static void amd8131_pcix_check(struct edac_pci_ctl_info *edac_dev)
 150 {
 151         struct amd8131_dev_info *dev_info = edac_dev->pvt_info;
 152         struct pci_dev *dev = dev_info->dev;
 153         u32 val32;
 154
 155         /* Check PCI-X Bridge Memory Base-Limit Register for errors */
 156         edac_pci_read_dword(dev, REG_MEM_LIM, &val32);
 157         if (val32 & MEM_LIMIT_MASK) {
 158                 printk(KERN_INFO "Error(s) in mem limit register "
 159                         "on %s bridge\n", dev_info->ctl_name);
 160                 printk(KERN_INFO "DPE: %d, RSE: %d, RMA: %d\n"
 161                         "RTA: %d, STA: %d, MDPE: %d\n",
 162                         val32 & MEM_LIMIT_DPE,
 163                         val32 & MEM_LIMIT_RSE,
 164                         val32 & MEM_LIMIT_RMA,
 165                         val32 & MEM_LIMIT_RTA,
 166                         val32 & MEM_LIMIT_STA,
 167                         val32 & MEM_LIMIT_MDPE);
 168
 169                 val32 |= MEM_LIMIT_MASK;
 170                 edac_pci_write_dword(dev, REG_MEM_LIM, val32);
 171
 172                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 173         }
 174
 175         /* Check if Discard Timer timed out */
 176         edac_pci_read_dword(dev, REG_INT_CTLR, &val32);
 177         if (val32 & INT_CTLR_DTS) {
 178                 printk(KERN_INFO "Error(s) in interrupt and control register "
 179                         "on %s bridge\n", dev_info->ctl_name);
 180                 printk(KERN_INFO "DTS: %d\n", val32 & INT_CTLR_DTS);
 181
 182                 val32 |= INT_CTLR_DTS;
 183                 edac_pci_write_dword(dev, REG_INT_CTLR, val32);
 184
 185                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 186         }
 187
 188         /* Check if CRC error happens on link side A */
 189         edac_pci_read_dword(dev, REG_LNK_CTRL_A, &val32);
 190         if (val32 & LNK_CTRL_CRCERR_A) {
 191                 printk(KERN_INFO "Error(s) in link conf and control register "
 192                         "on %s bridge\n", dev_info->ctl_name);
 193                 printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_A);
 194
 195                 val32 |= LNK_CTRL_CRCERR_A;
 196                 edac_pci_write_dword(dev, REG_LNK_CTRL_A, val32);
 197
 198                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 199         }
 200
 201         /* Check if CRC error happens on link side B */
 202         edac_pci_read_dword(dev, REG_LNK_CTRL_B, &val32);
 203         if (val32 & LNK_CTRL_CRCERR_B) {
 204                 printk(KERN_INFO "Error(s) in link conf and control register "
 205                         "on %s bridge\n", dev_info->ctl_name);
 206                 printk(KERN_INFO "CRCERR: %d\n", val32 & LNK_CTRL_CRCERR_B);
 207
 208                 val32 |= LNK_CTRL_CRCERR_B;
 209                 edac_pci_write_dword(dev, REG_LNK_CTRL_B, val32);
 210
 211                 edac_pci_handle_npe(edac_dev, edac_dev->ctl_name);
 212         }
 213 }
 214
 215 static struct amd8131_info amd8131_chipset = {
 216         .err_dev = PCI_DEVICE_ID_AMD_8131_APIC,
 217         .devices = amd8131_devices,
 218         .init = amd8131_pcix_init,
 219         .exit = amd8131_pcix_exit,
 220         .check = amd8131_pcix_check,
 221 };
 222
 223 /*
 224  * There are 4 PCIX Bridges on ATCA-6101 that share the same PCI Device ID,
 225  * so amd8131_probe() would be called by kernel 4 times, with different
 226  * address of pci_dev for each of them each time.
 227  */
 228 static int amd8131_probe(struct pci_dev *dev, const struct pci_device_id *id)
 229 {
 230         struct amd8131_dev_info *dev_info;
 231
 232         for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
 233                 dev_info++)
 234                 if (dev_info->devfn == dev->devfn)
 235                         break;
 236
 237         if (dev_info->inst == NO_BRIDGE) /* should never happen */
 238                 return -ENODEV;
 239
 240         /*
 241          * We can't call pci_get_device() as we are used to do because
 242          * there are 4 of them but pci_dev_get() instead.
 243          */
 244         dev_info->dev = pci_dev_get(dev);
 245
 246         if (pci_enable_device(dev_info->dev)) {
 247                 pci_dev_put(dev_info->dev);
 248                 printk(KERN_ERR "failed to enable:"
 249                         "vendor %x, device %x, devfn %x, name %s\n",
 250                         PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
 251                         dev_info->devfn, dev_info->ctl_name);
 252                 return -ENODEV;
 253         }
 254
 255         /*
 256          * we do not allocate extra private structure for
 257          * edac_pci_ctl_info, but make use of existing
 258          * one instead.
 259          */
 260         dev_info->edac_idx = edac_pci_alloc_index();
 261         dev_info->edac_dev = edac_pci_alloc_ctl_info(0, dev_info->ctl_name);
 262         if (!dev_info->edac_dev)
 263                 return -ENOMEM;
 264
 265         dev_info->edac_dev->pvt_info = dev_info;
 266         dev_info->edac_dev->dev = &dev_info->dev->dev;
 267         dev_info->edac_dev->mod_name = AMD8131_EDAC_MOD_STR;
 268         dev_info->edac_dev->ctl_name = dev_info->ctl_name;
 269         dev_info->edac_dev->dev_name = dev_name(&dev_info->dev->dev);
 270
 271         if (edac_op_state == EDAC_OPSTATE_POLL)
 272                 dev_info->edac_dev->edac_check = amd8131_chipset.check;
 273
 274         if (amd8131_chipset.init)
 275                 amd8131_chipset.init(dev_info);
 276
 277         if (edac_pci_add_device(dev_info->edac_dev, dev_info->edac_idx) > 0) {
 278                 printk(KERN_ERR "failed edac_pci_add_device() for %s\n",
 279                         dev_info->ctl_name);
 280                 edac_pci_free_ctl_info(dev_info->edac_dev);
 281                 return -ENODEV;
 282         }
 283
 284         printk(KERN_INFO "added one device on AMD8131 "
 285                 "vendor %x, device %x, devfn %x, name %s\n",
 286                 PCI_VENDOR_ID_AMD, amd8131_chipset.err_dev,
 287                 dev_info->devfn, dev_info->ctl_name);
 288
 289         return 0;
 290 }
 291
 292 static void amd8131_remove(struct pci_dev *dev)
 293 {
 294         struct amd8131_dev_info *dev_info;
 295
 296         for (dev_info = amd8131_chipset.devices; dev_info->inst != NO_BRIDGE;
 297                 dev_info++)
 298                 if (dev_info->devfn == dev->devfn)
 299                         break;
 300
 301         if (dev_info->inst == NO_BRIDGE) /* should never happen */
 302                 return;
 303
 304         if (dev_info->edac_dev) {
 305                 edac_pci_del_device(dev_info->edac_dev->dev);
 306                 edac_pci_free_ctl_info(dev_info->edac_dev);
 307         }
 308
 309         if (amd8131_chipset.exit)
 310                 amd8131_chipset.exit(dev_info);
 311
 312         pci_dev_put(dev_info->dev);
 313 }
 314
 315 static const struct pci_device_id amd8131_edac_pci_tbl[] = {
 316         {
 317         PCI_VEND_DEV(AMD, 8131_BRIDGE),
 318         .subvendor = PCI_ANY_ID,
 319         .subdevice = PCI_ANY_ID,
 320         .class = 0,
 321         .class_mask = 0,
 322         .driver_data = 0,
 323         },
 324         {
 325         0,
 326         }                       /* table is NULL-terminated */
 327 };
 328 MODULE_DEVICE_TABLE(pci, amd8131_edac_pci_tbl);
 329
 330 static struct pci_driver amd8131_edac_driver = {
 331         .name = AMD8131_EDAC_MOD_STR,
 332         .probe = amd8131_probe,
 333         .remove = amd8131_remove,
 334         .id_table = amd8131_edac_pci_tbl,
 335 };
 336
 337 static int __init amd8131_edac_init(void)
 338 {
 339         printk(KERN_INFO "AMD8131 EDAC driver " AMD8131_EDAC_REVISION "\n");
 340         printk(KERN_INFO "\t(c) 2008 Wind River Systems, Inc.\n");
 341
 342         /* Only POLL mode supported so far */
 343         edac_op_state = EDAC_OPSTATE_POLL;
 344
 345         return pci_register_driver(&amd8131_edac_driver);
 346 }
 347
 348 static void __exit amd8131_edac_exit(void)
 349 {
 350         pci_unregister_driver(&amd8131_edac_driver);
 351 }
 352
 353 module_init(amd8131_edac_init);
 354 module_exit(amd8131_edac_exit);
 355
 356 MODULE_LICENSE("GPL");
 357 MODULE_AUTHOR("Cao Qingtao <qingtao.cao@windriver.com>\n");
 358 MODULE_DESCRIPTION("AMD8131 HyperTransport PCI-X Tunnel EDAC kernel module");