ds1553_bus_lbc.c

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    1 /*-
    2  * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki
    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 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  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/cdefs.h>
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/clock.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/module.h>
   39 #include <sys/mutex.h>
   40 #include <sys/resource.h>
   41 #include <sys/rman.h>
   42 
   43 #include <machine/bus.h>
   44 #include <machine/resource.h>
   45 
   46 #include <powerpc/mpc85xx/ds1553_reg.h>
   47 #include <powerpc/mpc85xx/lbc.h>
   48 
   49 #include "clock_if.h"
   50 
   51 static devclass_t rtc_devclass;
   52 
   53 static int rtc_attach(device_t dev);
   54 static int rtc_probe(device_t dev);
   55 
   56 static device_method_t rtc_methods[] = {
   57         /* Device interface */
   58         DEVMETHOD(device_probe,         rtc_probe),
   59         DEVMETHOD(device_attach,        rtc_attach),
   60 
   61         /* clock interface */
   62         DEVMETHOD(clock_gettime,        ds1553_gettime),
   63         DEVMETHOD(clock_settime,        ds1553_settime),
   64 
   65         { 0, 0 }
   66 };
   67 
   68 static driver_t rtc_driver = {
   69         "rtc",
   70         rtc_methods,
   71         sizeof(struct ds1553_softc),
   72 };
   73 
   74 DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0);
   75 
   76 static int
   77 rtc_probe(device_t dev)
   78 {
   79         uintptr_t devtype;
   80         int error;
   81 
   82         error = BUS_READ_IVAR(device_get_parent(dev), dev, LBC_IVAR_DEVTYPE,
   83             &devtype);
   84         if (error)
   85                 return (error);
   86 
   87         if (devtype != LBC_DEVTYPE_RTC)
   88                 return (EINVAL);
   89 
   90         device_set_desc(dev, "Dallas Semiconductor DS1553 RTC");
   91 
   92         return (0);
   93 }
   94 
   95 static int
   96 rtc_attach(device_t dev)
   97 {
   98         struct timespec ts;
   99         struct ds1553_softc *sc;
  100         int error;
  101 
  102         sc = device_get_softc(dev);
  103         bzero(sc, sizeof(struct ds1553_softc));
  104 
  105         mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
  106 
  107         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
  108             RF_ACTIVE);
  109         if (sc->res == NULL) {
  110                 device_printf(dev, "cannot allocate resources\n");
  111                 mtx_destroy(&sc->sc_mtx);
  112                 return (ENXIO);
  113         }
  114 
  115         sc->sc_bst = rman_get_bustag(sc->res);
  116         sc->sc_bsh = rman_get_bushandle(sc->res);
  117 
  118         if ((error = ds1553_attach(dev)) != 0) {
  119                 device_printf(dev, "cannot attach time of day clock\n");
  120                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  121                 mtx_destroy(&sc->sc_mtx);
  122                 return (error);
  123         }
  124 
  125         clock_register(dev, 1000000);
  126 
  127         if (bootverbose) {
  128                 ds1553_gettime(dev, &ts);
  129                 device_printf(dev, "current time: %ld.%09ld\n",
  130                     (long)ts.tv_sec, ts.tv_nsec);
  131         }
  132 
  133         return (0);
  134 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/mpc85xx/ds1553_bus_lbc.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/mpc85xx/ds1553_bus_lbc.c