sys/dev/misc/ecc/ecc_amd8000.c

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>.   AMD register addresses and
   6  * values were pulled from MemTest-86 and Linux.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  * 3. Neither the name of The DragonFly Project nor the names of its
  19  *    contributors may be used to endorse or promote products derived
  20  *    from this software without specific, prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  25  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  26  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  32  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/bus.h>
  39 #include <sys/kernel.h>
  40 #include <sys/malloc.h>
  41
  42 #include <bus/pci/pcivar.h>
  43 #include <bus/pci/pcireg.h>
  44 #include <bus/pci/pci_cfgreg.h>
  45 #include <bus/pci/pcib_private.h>
  46
  47 #include "pcib_if.h"
  48
  49 struct ecc_amd8000_memctrl {
  50         uint16_t        vid;
  51         uint16_t        did;
  52         const char      *desc;
  53 };
  54
  55 struct ecc_amd8000_softc {
  56         device_t        ecc_dev;
  57         struct callout  ecc_callout;
  58 };
  59
  60 #define ecc_printf(sc, fmt, arg...) \
  61         device_printf((sc)->ecc_dev, fmt , ##arg)
  62
  63 static void     ecc_amd8000_callout(void *);
  64 static void     ecc_amd8000_stop(device_t);
  65
  66 static int      ecc_amd8000_probe(device_t);
  67 static int      ecc_amd8000_attach(device_t);
  68 static int      ecc_amd8000_detach(device_t);
  69 static void     ecc_amd8000_shutdown(device_t);
  70
  71 static const struct ecc_amd8000_memctrl ecc_memctrls[] = {
  72         { 0x1022, 0x1100, "AMD 8000 memory controller" },
  73         { 0x1022, 0x7454, "AMD 8151 memory controller" },
  74         { 0, 0, NULL } /* required last entry */
  75 };
  76
  77 static device_method_t ecc_amd8000_methods[] = {
  78         /* Device interface */
  79         DEVMETHOD(device_probe,         ecc_amd8000_probe),
  80         DEVMETHOD(device_attach,        ecc_amd8000_attach),
  81         DEVMETHOD(device_detach,        ecc_amd8000_detach),
  82         DEVMETHOD(device_shutdown,      ecc_amd8000_shutdown),
  83         DEVMETHOD(device_suspend,       bus_generic_suspend),
  84         DEVMETHOD(device_resume,        bus_generic_resume),
  85         DEVMETHOD_END
  86 };
  87
  88 static driver_t ecc_amd8000_driver = {
  89         "ecc",
  90         ecc_amd8000_methods,
  91         sizeof(struct ecc_amd8000_softc)
  92 };
  93 static devclass_t ecc_devclass;
  94 DRIVER_MODULE(ecc_amd8000, pci, ecc_amd8000_driver, ecc_devclass, NULL, NULL);
  95 MODULE_DEPEND(ecc_amd8000, pci, 1, 1, 1);
  96 MODULE_VERSION(ecc_amd8000, 1);
  97
  98 static int
  99 ecc_amd8000_probe(device_t dev)
 100 {
 101         const struct ecc_amd8000_memctrl *mc;
 102         uint16_t vid, did;
 103
 104         vid = pci_get_vendor(dev);
 105         did = pci_get_device(dev);
 106
 107         for (mc = ecc_memctrls; mc->desc != NULL; ++mc) {
 108                 if (mc->vid == vid && mc->did == did) {
 109                         device_set_desc(dev, mc->desc);
 110                         return (0);
 111                 }
 112         }
 113         return (ENXIO);
 114 }
 115
 116 static int
 117 ecc_amd8000_attach(device_t dev)
 118 {
 119         struct ecc_amd8000_softc *sc = device_get_softc(dev);
 120         uint32_t draminfo, eccinfo;
 121         int bus, slot, poll = 0;
 122
 123         callout_init_mp(&sc->ecc_callout);
 124         sc->ecc_dev = dev;
 125
 126         bus = pci_get_bus(dev);
 127         slot = pci_get_slot(dev);
 128
 129         /*
 130          * The memory bridge is recognized as four PCI devices
 131          * using function codes 0, 1, 2, and 3.  We probe for the
 132          * device at function code 0 and assume that all four exist.
 133          */
 134         draminfo = pcib_read_config(dev, bus, slot, 2, 0x90, 4);
 135         eccinfo = pcib_read_config(dev, bus, slot, 3, 0x44, 4);
 136
 137         if ((draminfo >> 17) & 1)
 138                 ecc_printf(sc, "memory type: ECC\n");
 139         else
 140                 ecc_printf(sc, "memory type: NON-ECC\n");
 141         switch((eccinfo >> 22) & 3) {
 142         case 0:
 143                 ecc_printf(sc, "ecc mode: DISABLED\n");
 144                 break;
 145         case 1:
 146                 ecc_printf(sc, "ecc mode: ENABLED/CORRECT-MODE\n");
 147                 poll = 1;
 148                 break;
 149         case 2:
 150                 ecc_printf(sc, "ecc mode: ENABLED/RESERVED (disabled)\n");
 151                 break;
 152         case 3:
 153                 ecc_printf(sc, "ecc mode: ENABLED/CHIPKILL-MODE\n");
 154                 poll = 1;
 155                 break;
 156         }
 157
 158         /*
 159          * Enable ECC logging and clear any previous error.
 160          */
 161         if (poll) {
 162                 uint64_t v64;
 163                 uint32_t v32;
 164
 165                 v64 = rdmsr(0x017B);
 166                 wrmsr(0x17B, (v64 & ~0xFFFFFFFFLL) | 0x00000010LL);
 167                 v32 = pcib_read_config(dev, bus, slot, 3, 0x4C, 4);
 168                 v32 &= 0x7F801EFC;
 169                 pcib_write_config(dev, bus, slot, 3, 0x4C, v32, 4);
 170
 171                 callout_reset(&sc->ecc_callout, hz, ecc_amd8000_callout, sc);
 172         }
 173         return (0);
 174 }
 175
 176 static void
 177 ecc_amd8000_callout(void *xsc)
 178 {
 179         struct ecc_amd8000_softc *sc = xsc;
 180         device_t dev = sc->ecc_dev;
 181         uint32_t v32, addr;
 182         int bus, slot;
 183
 184         bus = pci_get_bus(dev);
 185         slot = pci_get_slot(dev);
 186
 187         /*
 188          * The address calculation is not entirely correct.  We need to
 189          * look at the AMD chipset documentation.
 190          */
 191         v32 = pcib_read_config(dev, bus, slot, 3, 0x4C, 4);
 192         if ((v32 & 0x80004000) == 0x80004000) {
 193                 addr = pcib_read_config(dev, bus, slot, 3, 0x50, 4);
 194                 ecc_printf(sc, "Correctable ECC error at %08x\n", addr);
 195                 pcib_write_config(dev, bus, slot, 3, 0x4C, v32 & 0x7F801EFC, 4);
 196         } else if ((v32 & 0x80002000) == 0x80002000) {
 197                 addr = pcib_read_config(dev, bus ,slot, 3, 0x50, 4);
 198                 ecc_printf(sc, "Uncorrectable ECC error at %08x\n", addr);
 199                 pcib_write_config(dev, bus, slot, 3, 0x4C, v32 & 0x7F801EFC, 4);
 200         }
 201         callout_reset(&sc->ecc_callout, hz, ecc_amd8000_callout, sc);
 202 }
 203
 204 static void
 205 ecc_amd8000_stop(device_t dev)
 206 {
 207         struct ecc_amd8000_softc *sc = device_get_softc(dev);
 208
 209         callout_stop_sync(&sc->ecc_callout);
 210 }
 211
 212 static int
 213 ecc_amd8000_detach(device_t dev)
 214 {
 215         ecc_amd8000_stop(dev);
 216         return 0;
 217 }
 218
 219 static void
 220 ecc_amd8000_shutdown(device_t dev)
 221 {
 222         ecc_amd8000_stop(dev);
 223 }