a10_wdog.c

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    1 /*-
    2  * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.2/sys/arm/allwinner/a10_wdog.c 266405 2014-05-18 16:03:34Z ian $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/watchdog.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/module.h>
   36 #include <sys/mutex.h>
   37 #include <sys/rman.h>
   38 
   39 #include <dev/fdt/fdt_common.h>
   40 #include <dev/ofw/openfirm.h>
   41 #include <dev/ofw/ofw_bus.h>
   42 #include <dev/ofw/ofw_bus_subr.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/cpufunc.h>
   46 #include <machine/machdep.h>
   47 #include <machine/fdt.h>
   48 
   49 #include <arm/allwinner/a10_wdog.h>
   50 
   51 #define READ(_sc, _r) bus_read_4((_sc)->res, (_r))
   52 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
   53 
   54 #define WDOG_CTRL               0x00
   55 #define         WDOG_CTRL_RESTART       (1 << 0)
   56 #define WDOG_MODE               0x04
   57 #define         WDOG_MODE_INTVL_SHIFT   3
   58 #define         WDOG_MODE_RST_EN        (1 << 1)
   59 #define         WDOG_MODE_EN            (1 << 0)
   60 
   61 struct a10wd_interval {
   62         uint64_t        milliseconds;
   63         unsigned int    value;
   64 };
   65 
   66 struct a10wd_interval wd_intervals[] = {
   67         {   500,         0 },
   68         {  1000,         1 },
   69         {  2000,         2 },
   70         {  3000,         3 },
   71         {  4000,         4 },
   72         {  5000,         5 },
   73         {  6000,         6 },
   74         {  8000,         7 },
   75         { 10000,         8 },
   76         { 12000,         9 },
   77         { 14000,        10 },
   78         { 16000,        11 },
   79         { 0,             0 } /* sentinel */
   80 };
   81 
   82 static struct a10wd_softc *a10wd_sc = NULL;
   83 
   84 struct a10wd_softc {
   85         device_t                dev;
   86         struct resource *       res;
   87         struct mtx              mtx;
   88 };
   89 
   90 static void a10wd_watchdog_fn(void *private, u_int cmd, int *error);
   91 
   92 static int
   93 a10wd_probe(device_t dev)
   94 {
   95 
   96         if (!ofw_bus_status_okay(dev))
   97                 return (ENXIO);
   98 
   99         if (ofw_bus_is_compatible(dev, "allwinner,sun4i-wdt")) {
  100                 device_set_desc(dev, "Allwinner A10 Watchdog");
  101                 return (BUS_PROBE_DEFAULT);
  102         }
  103 
  104         return (ENXIO);
  105 }
  106 
  107 static int
  108 a10wd_attach(device_t dev)
  109 {
  110         struct a10wd_softc *sc;
  111         int rid;
  112 
  113         if (a10wd_sc != NULL)
  114                 return (ENXIO);
  115 
  116         sc = device_get_softc(dev);
  117         sc->dev = dev;
  118 
  119         rid = 0;
  120         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  121         if (sc->res == NULL) {
  122                 device_printf(dev, "could not allocate memory resource\n");
  123                 return (ENXIO);
  124         }
  125 
  126         a10wd_sc = sc;
  127         mtx_init(&sc->mtx, "A10 Watchdog", "a10wd", MTX_DEF);
  128         EVENTHANDLER_REGISTER(watchdog_list, a10wd_watchdog_fn, sc, 0);
  129 
  130         return (0);
  131 }
  132 
  133 static void
  134 a10wd_watchdog_fn(void *private, u_int cmd, int *error)
  135 {
  136         struct a10wd_softc *sc;
  137         uint64_t ms;
  138         int i;
  139 
  140         sc = private;
  141         mtx_lock(&sc->mtx);
  142 
  143         cmd &= WD_INTERVAL;
  144 
  145         if (cmd > 0) {
  146                 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
  147                 i = 0;
  148                 while (wd_intervals[i].milliseconds && 
  149                     (ms > wd_intervals[i].milliseconds))
  150                         i++;
  151                 if (wd_intervals[i].milliseconds) {
  152                         WRITE(sc, WDOG_MODE, 
  153                             (wd_intervals[i].value << WDOG_MODE_INTVL_SHIFT) |
  154                             WDOG_MODE_EN | WDOG_MODE_RST_EN);
  155                         WRITE(sc, WDOG_CTRL, WDOG_CTRL_RESTART);
  156                         *error = 0;
  157                 }
  158                 else {
  159                         /* 
  160                          * Can't arm
  161                          * disable watchdog as watchdog(9) requires
  162                          */
  163                         device_printf(sc->dev,
  164                             "Can't arm, timeout is more than 16 sec\n");
  165                         mtx_unlock(&sc->mtx);
  166                         WRITE(sc, WDOG_MODE, 0);
  167                         return;
  168                 }
  169         }
  170         else
  171                 WRITE(sc, WDOG_MODE, 0);
  172 
  173         mtx_unlock(&sc->mtx);
  174 }
  175 
  176 void
  177 a10wd_watchdog_reset()
  178 {
  179 
  180         if (a10wd_sc == NULL) {
  181                 printf("Reset: watchdog device has not been initialized\n");
  182                 return;
  183         }
  184 
  185         WRITE(a10wd_sc, WDOG_MODE, 
  186             (wd_intervals[0].value << WDOG_MODE_INTVL_SHIFT) |
  187             WDOG_MODE_EN | WDOG_MODE_RST_EN);
  188 
  189         while(1)
  190                 ;
  191 
  192 }
  193 
  194 static device_method_t a10wd_methods[] = {
  195         DEVMETHOD(device_probe, a10wd_probe),
  196         DEVMETHOD(device_attach, a10wd_attach),
  197 
  198         DEVMETHOD_END
  199 };
  200 
  201 static driver_t a10wd_driver = {
  202         "a10wd",
  203         a10wd_methods,
  204         sizeof(struct a10wd_softc),
  205 };
  206 static devclass_t a10wd_devclass;
  207 
  208 DRIVER_MODULE(a10wd, simplebus, a10wd_driver, a10wd_devclass, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/arm/allwinner/a10_wdog.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/allwinner/a10_wdog.c