viawd.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2011 Fabien Thomas <fabient@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/eventhandler.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <machine/bus.h>
   39 #include <sys/rman.h>
   40 #include <machine/resource.h>
   41 #include <sys/watchdog.h>
   42 
   43 #include <isa/isavar.h>
   44 #include <dev/pci/pcivar.h>
   45 
   46 #include "viawd.h"
   47 
   48 #define viawd_read_4(sc, off)   bus_read_4((sc)->wd_res, (off))
   49 #define viawd_write_4(sc, off, val)     \
   50         bus_write_4((sc)->wd_res, (off), (val))
   51 
   52 static struct viawd_device viawd_devices[] = {
   53         { DEVICEID_VT8251, "VIA VT8251 watchdog timer" },
   54         { DEVICEID_CX700,  "VIA CX700 watchdog timer" },
   55         { DEVICEID_VX800,  "VIA VX800 watchdog timer" },
   56         { DEVICEID_VX855,  "VIA VX855 watchdog timer" },
   57         { DEVICEID_VX900,  "VIA VX900 watchdog timer" },
   58         { 0, NULL },
   59 };
   60 
   61 static void
   62 viawd_tmr_state(struct viawd_softc *sc, int enable)
   63 {
   64         uint32_t reg;
   65 
   66         reg = viawd_read_4(sc, VIAWD_MEM_CTRL);
   67         if (enable)
   68                 reg |= VIAWD_MEM_CTRL_TRIGGER | VIAWD_MEM_CTRL_ENABLE;
   69         else
   70                 reg &= ~VIAWD_MEM_CTRL_ENABLE;
   71         viawd_write_4(sc, VIAWD_MEM_CTRL, reg);
   72 }
   73 
   74 static void
   75 viawd_tmr_set(struct viawd_softc *sc, unsigned int timeout)
   76 {
   77 
   78         /* Keep value in range. */
   79         if (timeout < VIAWD_MEM_COUNT_MIN)
   80                 timeout = VIAWD_MEM_COUNT_MIN;
   81         else if (timeout > VIAWD_MEM_COUNT_MAX)
   82                 timeout = VIAWD_MEM_COUNT_MAX;
   83 
   84         viawd_write_4(sc, VIAWD_MEM_COUNT, timeout);
   85         sc->timeout = timeout;
   86 }
   87 
   88 /*
   89  * Watchdog event handler - called by the framework to enable or disable
   90  * the watchdog or change the initial timeout value.
   91  */
   92 static void
   93 viawd_event(void *arg, unsigned int cmd, int *error)
   94 {
   95         struct viawd_softc *sc = arg;
   96         unsigned int timeout;
   97 
   98         /* Convert from power-of-two-ns to second. */
   99         cmd &= WD_INTERVAL;
  100         timeout = ((uint64_t)1 << cmd) / 1000000000;
  101         if (cmd) {
  102                 if (timeout != sc->timeout)
  103                         viawd_tmr_set(sc, timeout);
  104                 viawd_tmr_state(sc, 1);
  105                 *error = 0;
  106         } else
  107                 viawd_tmr_state(sc, 0);
  108 }
  109 
  110 /* Look for a supported VIA south bridge. */
  111 static struct viawd_device *
  112 viawd_find(device_t dev)
  113 {
  114         struct viawd_device *id;
  115 
  116         if (pci_get_vendor(dev) != VENDORID_VIA)
  117                 return (NULL);
  118         for (id = viawd_devices; id->desc != NULL; id++)
  119                 if (pci_get_device(dev) == id->device)
  120                         return (id);
  121         return (NULL);
  122 }
  123 
  124 static void
  125 viawd_identify(driver_t *driver, device_t parent)
  126 {
  127 
  128         if (viawd_find(parent) == NULL)
  129                 return;
  130 
  131         if (device_find_child(parent, driver->name, -1) == NULL)
  132                 BUS_ADD_CHILD(parent, 0, driver->name, 0);
  133 }
  134 
  135 static int
  136 viawd_probe(device_t dev)
  137 {
  138         struct viawd_device *id;
  139 
  140         id = viawd_find(device_get_parent(dev));
  141         KASSERT(id != NULL, ("parent should be a valid VIA SB"));
  142         device_set_desc(dev, id->desc);
  143         return (BUS_PROBE_GENERIC);
  144 }
  145 
  146 static int
  147 viawd_attach(device_t dev)
  148 {
  149         device_t sb_dev;
  150         struct viawd_softc *sc;
  151         uint32_t pmbase, reg;
  152 
  153         sc = device_get_softc(dev);
  154         sc->dev = dev;
  155 
  156         sb_dev = device_get_parent(dev);
  157         if (sb_dev == NULL) {
  158                 device_printf(dev, "Can not find watchdog device.\n");
  159                 goto fail;
  160         }
  161         sc->sb_dev = sb_dev;
  162 
  163         /* Get watchdog memory base. */
  164         pmbase = pci_read_config(sb_dev, VIAWD_CONFIG_BASE, 4);
  165         if (pmbase == 0) {
  166                 device_printf(dev,
  167                     "Watchdog disabled in BIOS or hardware\n");
  168                 goto fail;
  169         }
  170 
  171         /* Allocate I/O register space. */
  172         sc->wd_rid = VIAWD_CONFIG_BASE;
  173         sc->wd_res = bus_alloc_resource_any(sb_dev, SYS_RES_MEMORY, &sc->wd_rid,
  174             RF_ACTIVE | RF_SHAREABLE);
  175         if (sc->wd_res == NULL) {
  176                 device_printf(dev, "Unable to map watchdog memory\n");
  177                 goto fail;
  178         }
  179         if (rman_get_size(sc->wd_res) < VIAWD_MEM_LEN) {
  180                 device_printf(dev, "Bad size for watchdog memory: %#x\n",
  181                     (unsigned)rman_get_size(sc->wd_res));
  182                 goto fail;
  183         }
  184 
  185         /* Check if watchdog fired last boot. */
  186         reg = viawd_read_4(sc, VIAWD_MEM_CTRL);
  187         if (reg & VIAWD_MEM_CTRL_FIRED) {
  188                 device_printf(dev,
  189                     "ERROR: watchdog rebooted the system\n");
  190                 /* Reset bit state. */
  191                 viawd_write_4(sc, VIAWD_MEM_CTRL, reg);
  192         }
  193 
  194         /* Register the watchdog event handler. */
  195         sc->ev_tag = EVENTHANDLER_REGISTER(watchdog_list, viawd_event, sc, 0);
  196 
  197         return (0);
  198 fail:
  199         if (sc->wd_res != NULL)
  200                 bus_release_resource(sb_dev, SYS_RES_MEMORY,
  201                     sc->wd_rid, sc->wd_res);
  202         return (ENXIO);
  203 }
  204 
  205 static int
  206 viawd_detach(device_t dev)
  207 {
  208         struct viawd_softc *sc;
  209         uint32_t reg;
  210 
  211         sc = device_get_softc(dev);
  212 
  213         /* Deregister event handler. */
  214         if (sc->ev_tag != NULL)
  215                 EVENTHANDLER_DEREGISTER(watchdog_list, sc->ev_tag);
  216         sc->ev_tag = NULL;
  217 
  218         /*
  219          * Do not stop the watchdog on shutdown if active but bump the
  220          * timer to avoid spurious reset.
  221          */
  222         reg = viawd_read_4(sc, VIAWD_MEM_CTRL);
  223         if (reg & VIAWD_MEM_CTRL_ENABLE) {
  224                 viawd_tmr_set(sc, VIAWD_TIMEOUT_SHUTDOWN);
  225                 viawd_tmr_state(sc, 1);
  226                 device_printf(dev,
  227                     "Keeping watchdog alive during shutdown for %d seconds\n",
  228                     VIAWD_TIMEOUT_SHUTDOWN);
  229         }
  230 
  231         if (sc->wd_res != NULL)
  232                 bus_release_resource(sc->sb_dev, SYS_RES_MEMORY,
  233                     sc->wd_rid, sc->wd_res);
  234 
  235         return (0);
  236 }
  237 
  238 static device_method_t viawd_methods[] = {
  239         DEVMETHOD(device_identify, viawd_identify),
  240         DEVMETHOD(device_probe, viawd_probe),
  241         DEVMETHOD(device_attach, viawd_attach),
  242         DEVMETHOD(device_detach, viawd_detach),
  243         DEVMETHOD(device_shutdown, viawd_detach),
  244         {0,0}
  245 };
  246 
  247 static driver_t viawd_driver = {
  248         "viawd",
  249         viawd_methods,
  250         sizeof(struct viawd_softc),
  251 };
  252 
  253 DRIVER_MODULE(viawd, isab, viawd_driver, NULL, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/dev/viawd/viawd.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/viawd/viawd.c