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/pcibus.h>
  45 #include <bus/pci/pci_cfgreg.h>
  46 #include <bus/pci/pcib_private.h>
  47
  48 #include "pcib_if.h"
  49
  50 struct ecc_amd8000_memctrl {
  51         uint16_t        vid;
  52         uint16_t        did;
  53         const char      *desc;
  54 };
  55
  56 struct ecc_amd8000_softc {
  57         device_t        ecc_device;
  58         device_t        ecc_mydev;
  59         struct callout  ecc_callout;
  60 };
  61
  62 #define ecc_printf(sc, fmt, arg...) \
  63         device_printf((sc)->ecc_mydev, fmt , ##arg)
  64
  65 static void     ecc_amd8000_callout(void *);
  66 static void     ecc_amd8000_stop(device_t);
  67
  68 static int      ecc_amd8000_probe(device_t);
  69 static int      ecc_amd8000_attach(device_t);
  70 static int      ecc_amd8000_detach(device_t);
  71 static void     ecc_amd8000_shutdown(device_t);
  72
  73 static const struct ecc_amd8000_memctrl ecc_memctrls[] = {
  74         { 0x1022, 0x1100, "AMD 8000 memory controller" },
  75         { 0x1022, 0x7454, "AMD 8151 memory controller" },
  76         { 0, 0, NULL } /* required last entry */
  77 };
  78
  79 static device_method_t ecc_amd8000_methods[] = {
  80         /* Device interface */
  81         DEVMETHOD(device_probe,         ecc_amd8000_probe),
  82         DEVMETHOD(device_attach,        ecc_amd8000_attach),
  83         DEVMETHOD(device_detach,        ecc_amd8000_detach),
  84         DEVMETHOD(device_shutdown,      ecc_amd8000_shutdown),
  85         DEVMETHOD(device_suspend,       bus_generic_suspend),
  86         DEVMETHOD(device_resume,        bus_generic_resume),
  87         DEVMETHOD_END
  88 };
  89
  90 static driver_t ecc_amd8000_driver = {
  91         "ecc",
  92         ecc_amd8000_methods,
  93         sizeof(struct ecc_amd8000_softc)
  94 };
  95 static devclass_t ecc_devclass;
  96 DRIVER_MODULE(ecc_amd8000, hostb, ecc_amd8000_driver, ecc_devclass, NULL, NULL);
  97 MODULE_DEPEND(ecc_amd8000, pci, 1, 1, 1);
  98
  99 static int
 100 ecc_amd8000_probe(device_t dev)
 101 {
 102         const struct ecc_amd8000_memctrl *mc;
 103         uint16_t vid, did;
 104
 105         vid = pci_get_vendor(dev);
 106         did = pci_get_device(dev);
 107
 108         for (mc = ecc_memctrls; mc->desc != NULL; ++mc) {
 109                 if (mc->vid == vid && mc->did == did) {
 110                         struct ecc_amd8000_softc *sc = device_get_softc(dev);
 111
 112                         device_set_desc(dev, mc->desc);
 113                         sc->ecc_mydev = dev;
 114                         sc->ecc_device = device_get_parent(dev);
 115                         return (0);
 116                 }
 117         }
 118         return (ENXIO);
 119 }
 120
 121 static int
 122 ecc_amd8000_attach(device_t dev)
 123 {
 124         struct ecc_amd8000_softc *sc = device_get_softc(dev);
 125         uint32_t draminfo, eccinfo;
 126         int bus, slot, poll = 0;
 127
 128         callout_init_mp(&sc->ecc_callout);
 129
 130         dev = sc->ecc_device; /* XXX */
 131
 132         bus = pci_get_bus(dev);
 133         slot = pci_get_slot(dev);
 134
 135         /*
 136          * The memory bridge is recognized as four PCI devices
 137          * using function codes 0, 1, 2, and 3.  We probe for the
 138          * device at function code 0 and assume that all four exist.
 139          */
 140         draminfo = pcib_read_config(dev, bus, slot, 2, 0x90, 4);
 141         eccinfo = pcib_read_config(dev, bus, slot, 3, 0x44, 4);
 142
 143         if ((draminfo >> 17) & 1)
 144                 ecc_printf(sc, "memory type: ECC\n");
 145         else
 146                 ecc_printf(sc, "memory type: NON-ECC\n");
 147         switch((eccinfo >> 22) & 3) {
 148         case 0:
 149                 ecc_printf(sc, "ecc mode: DISABLED\n");
 150                 break;
 151         case 1:
 152                 ecc_printf(sc, "ecc mode: ENABLED/CORRECT-MODE\n");
 153                 poll = 1;
 154                 break;
 155         case 2:
 156                 ecc_printf(sc, "ecc mode: ENABLED/RESERVED (disabled)\n");
 157                 break;
 158         case 3:
 159                 ecc_printf(sc, "ecc mode: ENABLED/CHIPKILL-MODE\n");
 160                 poll = 1;
 161                 break;
 162         }
 163
 164         /*
 165          * Enable ECC logging and clear any previous error.
 166          */
 167         if (poll) {
 168                 uint64_t v64;
 169                 uint32_t v32;
 170
 171                 v64 = rdmsr(0x017B);
 172                 wrmsr(0x17B, (v64 & ~0xFFFFFFFFLL) | 0x00000010LL);
 173                 v32 = pcib_read_config(dev, bus, slot, 3, 0x4C, 4);
 174                 v32 &= 0x7F801EFC;
 175                 pcib_write_config(dev, bus, slot, 3, 0x4C, v32, 4);
 176
 177                 callout_reset(&sc->ecc_callout, hz, ecc_amd8000_callout, sc);
 178         }
 179         return (0);
 180 }
 181
 182 static void
 183 ecc_amd8000_callout(void *xsc)
 184 {
 185         struct ecc_amd8000_softc *sc = xsc;
 186         device_t dev = sc->ecc_device;
 187         uint32_t v32, addr;
 188         int bus, slot;
 189
 190         bus = pci_get_bus(dev);
 191         slot = pci_get_slot(dev);
 192
 193         /*
 194          * The address calculation is not entirely correct.  We need to
 195          * look at the AMD chipset documentation.
 196          */
 197         v32 = pcib_read_config(dev, bus, slot, 3, 0x4C, 4);
 198         if ((v32 & 0x80004000) == 0x80004000) {
 199                 addr = pcib_read_config(dev, bus, slot, 3, 0x50, 4);
 200                 ecc_printf(sc, "Correctable ECC error at %08x\n", addr);
 201                 pcib_write_config(dev, bus, slot, 3, 0x4C, v32 & 0x7F801EFC, 4);
 202         } else if ((v32 & 0x80002000) == 0x80002000) {
 203                 addr = pcib_read_config(dev, bus ,slot, 3, 0x50, 4);
 204                 ecc_printf(sc, "Uncorrectable ECC error at %08x\n", addr);
 205                 pcib_write_config(dev, bus, slot, 3, 0x4C, v32 & 0x7F801EFC, 4);
 206         }
 207         callout_reset(&sc->ecc_callout, hz, ecc_amd8000_callout, sc);
 208 }
 209
 210 static void
 211 ecc_amd8000_stop(device_t dev)
 212 {
 213         struct ecc_amd8000_softc *sc = device_get_softc(dev);
 214
 215         callout_stop_sync(&sc->ecc_callout);
 216 }
 217
 218 static int
 219 ecc_amd8000_detach(device_t dev)
 220 {
 221         ecc_amd8000_stop(dev);
 222         return 0;
 223 }
 224
 225 static void
 226 ecc_amd8000_shutdown(device_t dev)
 227 {
 228         ecc_amd8000_stop(dev);
 229 }