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/10.0/sys/arm/allwinner/a10_wdog.c 246707 2013-02-12 07:27:40Z gonzo $");
   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_is_compatible(dev, "allwinner,sun4i-wdt")) {
   97                 device_set_desc(dev, "Allwinner A10 Watchdog");
   98                 return (BUS_PROBE_DEFAULT);
   99         }
  100 
  101         return (ENXIO);
  102 }
  103 
  104 static int
  105 a10wd_attach(device_t dev)
  106 {
  107         struct a10wd_softc *sc;
  108         int rid;
  109 
  110         if (a10wd_sc != NULL)
  111                 return (ENXIO);
  112 
  113         sc = device_get_softc(dev);
  114         sc->dev = dev;
  115 
  116         rid = 0;
  117         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  118         if (sc->res == NULL) {
  119                 device_printf(dev, "could not allocate memory resource\n");
  120                 return (ENXIO);
  121         }
  122 
  123         a10wd_sc = sc;
  124         mtx_init(&sc->mtx, "A10 Watchdog", "a10wd", MTX_DEF);
  125         EVENTHANDLER_REGISTER(watchdog_list, a10wd_watchdog_fn, sc, 0);
  126 
  127         return (0);
  128 }
  129 
  130 static void
  131 a10wd_watchdog_fn(void *private, u_int cmd, int *error)
  132 {
  133         struct a10wd_softc *sc;
  134         uint64_t ms;
  135         int i;
  136 
  137         sc = private;
  138         mtx_lock(&sc->mtx);
  139 
  140         cmd &= WD_INTERVAL;
  141 
  142         if (cmd > 0) {
  143                 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
  144                 i = 0;
  145                 while (wd_intervals[i].milliseconds && 
  146                     (ms > wd_intervals[i].milliseconds))
  147                         i++;
  148                 if (wd_intervals[i].milliseconds) {
  149                         WRITE(sc, WDOG_MODE, 
  150                             (wd_intervals[i].value << WDOG_MODE_INTVL_SHIFT) |
  151                             WDOG_MODE_EN | WDOG_MODE_RST_EN);
  152                         WRITE(sc, WDOG_CTRL, WDOG_CTRL_RESTART);
  153                 }
  154         }
  155         else
  156                 WRITE(sc, WDOG_MODE, 0);
  157 
  158         mtx_unlock(&sc->mtx);
  159 }
  160 
  161 void
  162 a10wd_watchdog_reset()
  163 {
  164 
  165         if (a10wd_sc == NULL) {
  166                 printf("Reset: watchdog device has not been initialized\n");
  167                 return;
  168         }
  169 
  170         WRITE(a10wd_sc, WDOG_MODE, 
  171             (wd_intervals[0].value << WDOG_MODE_INTVL_SHIFT) |
  172             WDOG_MODE_EN | WDOG_MODE_RST_EN);
  173 
  174         while(1)
  175                 ;
  176 
  177 }
  178 
  179 static device_method_t a10wd_methods[] = {
  180         DEVMETHOD(device_probe, a10wd_probe),
  181         DEVMETHOD(device_attach, a10wd_attach),
  182 
  183         DEVMETHOD_END
  184 };
  185 
  186 static driver_t a10wd_driver = {
  187         "a10wd",
  188         a10wd_methods,
  189         sizeof(struct a10wd_softc),
  190 };
  191 static devclass_t a10wd_devclass;
  192 
  193 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