The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/atheros/ar71xx_wdog.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@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 unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 /*
   31  * Watchdog driver for AR71xx 
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: stable/12/sys/mips/atheros/ar71xx_wdog.c 326259 2017-11-27 15:07:26Z pfg $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/watchdog.h>
   40 #include <sys/bus.h>
   41 #include <sys/kernel.h>
   42 #include <sys/module.h>
   43 #include <sys/sysctl.h>
   44 
   45 #include <mips/atheros/ar71xxreg.h>
   46 #include <mips/atheros/ar71xx_cpudef.h>
   47 
   48 struct ar71xx_wdog_softc {
   49         device_t dev;
   50         int armed;
   51         int reboot_from_watchdog;
   52         int debug;
   53 };
   54 
   55 static void
   56 ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
   57 {
   58         struct ar71xx_wdog_softc *sc = private;
   59         uint64_t timer_val;
   60 
   61         cmd &= WD_INTERVAL;
   62         if (sc->debug)
   63                 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: cmd: %x\n", cmd);
   64         if (cmd > 0) {
   65                 timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
   66                     1000000000;
   67                 if (sc->debug)
   68                         device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
   69                 /*
   70                  * Load timer with large enough value to prevent spurious
   71                  * reset
   72                  */
   73                 ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER, 
   74                     ar71xx_ahb_freq() * 10);
   75                 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, 
   76                     RST_WDOG_ACTION_RESET);
   77                 ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER, 
   78                     (timer_val & 0xffffffff));
   79                 sc->armed = 1;
   80                 *error = 0;
   81         } else {
   82                 if (sc->debug)
   83                         device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: disarming\n");
   84                 if (sc->armed) {
   85                         ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, 
   86                             RST_WDOG_ACTION_NOACTION);
   87                         sc->armed = 0;
   88                 }
   89         }
   90 }
   91 
   92 static int
   93 ar71xx_wdog_probe(device_t dev)
   94 {
   95 
   96         device_set_desc(dev, "Atheros AR71XX watchdog timer");
   97         return (BUS_PROBE_NOWILDCARD);
   98 }
   99 
  100 static void
  101 ar71xx_wdog_sysctl(device_t dev)
  102 {
  103         struct ar71xx_wdog_softc *sc = device_get_softc(dev);
  104 
  105         struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
  106         struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
  107 
  108         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
  109                 "debug", CTLFLAG_RW, &sc->debug, 0,
  110                 "enable watchdog debugging");
  111         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
  112                 "armed", CTLFLAG_RD, &sc->armed, 0,
  113                 "whether the watchdog is armed");
  114         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
  115                 "reboot_from_watchdog", CTLFLAG_RD, &sc->reboot_from_watchdog, 0,
  116                 "whether the system rebooted from the watchdog");
  117 }
  118 
  119 
  120 static int
  121 ar71xx_wdog_attach(device_t dev)
  122 {
  123         struct ar71xx_wdog_softc *sc = device_get_softc(dev);
  124         
  125         /* Initialise */
  126         sc->reboot_from_watchdog = 0;
  127         sc->armed = 0;
  128         sc->debug = 0;
  129 
  130         if (ATH_READ_REG(AR71XX_RST_WDOG_CONTROL) & RST_WDOG_LAST) {
  131                 device_printf (dev, 
  132                     "Previous reset was due to watchdog timeout\n");
  133                 sc->reboot_from_watchdog = 1;
  134         }
  135 
  136         ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
  137 
  138         sc->dev = dev;
  139         EVENTHANDLER_REGISTER(watchdog_list, ar71xx_wdog_watchdog_fn, sc, 0);
  140         ar71xx_wdog_sysctl(dev);
  141 
  142         return (0);
  143 }
  144 
  145 static device_method_t ar71xx_wdog_methods[] = {
  146         DEVMETHOD(device_probe, ar71xx_wdog_probe),
  147         DEVMETHOD(device_attach, ar71xx_wdog_attach),
  148         {0, 0},
  149 };
  150 
  151 static driver_t ar71xx_wdog_driver = {
  152         "ar71xx_wdog",
  153         ar71xx_wdog_methods,
  154         sizeof(struct ar71xx_wdog_softc),
  155 };
  156 static devclass_t ar71xx_wdog_devclass;
  157 
  158 DRIVER_MODULE(ar71xx_wdog, nexus, ar71xx_wdog_driver, ar71xx_wdog_devclass, 0, 0);

Cache object: 65c43eea6c9ee4fe57e966512742b08a


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