rk30xx_wdog.c

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    1 /*-
    2  * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@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("$FreeBSD$");
   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/rockchip/rk30xx_wdog.h>
   50 
   51 #ifndef RK30_WDT_BASE
   52 #define RK30_WDT_BASE           0x2004c000
   53 #define RK30_WDT_PSIZE          0x100
   54 #endif
   55 
   56 #define RK30_WDT_READ(_sc, _r)          bus_read_4((_sc)->res, (_r))
   57 #define RK30_WDT_WRITE(_sc, _r, _v)     bus_write_4((_sc)->res, (_r), (_v))
   58 
   59 #define WDOG_CTRL               0x00
   60 #define WDOG_CTRL_EN            (1 << 0)
   61 #define WDOG_CTRL_RSP_MODE      (1 << 1)
   62 #define WDOG_CTRL_RST_PULSE     (4 << 2)
   63 #define WDOG_CTRL_RST           0xa
   64 #define WDOG_TORR               0x04
   65 #define WDOG_TORR_INTVL_SHIFT   0
   66 #define WDOG_CCVR               0x08
   67 #define WDOG_CRR                0x0c
   68 #define WDOG_CRR_PWD            0x76
   69 #define WDOG_STAT               0x10
   70 #define WDOG_EOI                0x14
   71 
   72 static struct rk30_wd_softc *rk30_wd_sc = NULL;
   73 
   74 struct rk30_wd_softc {
   75         device_t                dev;
   76         struct resource         *res;
   77         struct mtx              mtx;
   78         int                     freq;
   79 };
   80 
   81 static void rk30_wd_watchdog_fn(void *private, u_int cmd, int *error);
   82 
   83 static int
   84 rk30_wd_probe(device_t dev)
   85 {
   86 
   87         if (!ofw_bus_status_okay(dev))
   88                 return (ENXIO);
   89 
   90         if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-wdt")) {
   91                 device_set_desc(dev, "Rockchip RK30XX Watchdog");
   92                 return (BUS_PROBE_DEFAULT);
   93         }
   94 
   95         return (ENXIO);
   96 }
   97 
   98 static int
   99 rk30_wd_attach(device_t dev)
  100 {
  101         struct rk30_wd_softc *sc;
  102         int rid;
  103         phandle_t node;
  104         pcell_t cell;
  105 
  106         if (rk30_wd_sc != NULL)
  107                 return (ENXIO);
  108 
  109         sc = device_get_softc(dev);
  110         sc->dev = dev;
  111 
  112         node = ofw_bus_get_node(sc->dev);
  113         if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) > 0)
  114                 sc->freq = cell / 1000000;
  115         else
  116                 return (ENXIO);
  117 
  118         rid = 0;
  119         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  120         if (sc->res == NULL) {
  121                 device_printf(dev, "could not allocate memory resource\n");
  122                 return (ENXIO);
  123         }
  124 
  125         rk30_wd_sc = sc;
  126         mtx_init(&sc->mtx, "RK30XX Watchdog", "rk30_wd", MTX_DEF);
  127         EVENTHANDLER_REGISTER(watchdog_list, rk30_wd_watchdog_fn, sc, 0);
  128 
  129         return (0);
  130 }
  131 
  132 static void
  133 rk30_wd_watchdog_fn(void *private, u_int cmd, int *error)
  134 {
  135         struct rk30_wd_softc *sc;
  136         uint64_t ms, m, max;
  137         int i;
  138 
  139         sc = private;
  140         mtx_lock(&sc->mtx);
  141 
  142         cmd &= WD_INTERVAL;
  143 
  144         if (cmd > 0) {
  145                 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
  146                 m = 0xffff / sc->freq;
  147                 max = 0x7fffffff / sc->freq + 1;
  148                 i = 0;
  149                 while (m < max && m < ms) {
  150                         m <<= 1;
  151                         i++;
  152                 }
  153                 if (m < max) {
  154                         RK30_WDT_WRITE(sc, WDOG_TORR,
  155                             i << WDOG_TORR_INTVL_SHIFT);
  156                         RK30_WDT_WRITE(sc, WDOG_CTRL,
  157                             WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE |
  158                             WDOG_CTRL_RST_PULSE);
  159                         RK30_WDT_WRITE(sc, WDOG_CRR, WDOG_CRR_PWD);
  160                         *error = 0;
  161                 } else {
  162                         device_printf(sc->dev, "Can not be disabled\n");
  163                         mtx_unlock(&sc->mtx);
  164                         RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
  165                         return;
  166                 }
  167         }
  168         else
  169                 RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
  170 
  171         mtx_unlock(&sc->mtx);
  172 }
  173 
  174 void
  175 rk30_wd_watchdog_reset()
  176 {
  177         bus_space_handle_t bsh;
  178 
  179         bus_space_map(fdtbus_bs_tag, RK30_WDT_BASE, RK30_WDT_PSIZE, 0, &bsh);
  180         bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_TORR, 0);
  181         bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_CTRL,
  182             WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE | WDOG_CTRL_RST_PULSE);
  183 
  184         while (1);
  185 }
  186 
  187 static device_method_t rk30_wd_methods[] = {
  188         DEVMETHOD(device_probe, rk30_wd_probe),
  189         DEVMETHOD(device_attach, rk30_wd_attach),
  190 
  191         DEVMETHOD_END
  192 };
  193 
  194 static driver_t rk30_wd_driver = {
  195         "rk30_wd",
  196         rk30_wd_methods,
  197         sizeof(struct rk30_wd_softc),
  198 };
  199 static devclass_t rk30_wd_devclass;
  200 
  201 DRIVER_MODULE(rk30_wd, simplebus, rk30_wd_driver, rk30_wd_devclass, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/arm/rockchip/rk30xx_wdog.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/rockchip/rk30xx_wdog.c