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/powerpc/mpc85xx/ds1553_bus_fdt.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  * From: FreeBSD: src/sys/powerpc/mpc85xx/ds1553_bus_lbc.c,v 1.2 2009/06/24 15:48:20 raj
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/11.0/sys/powerpc/mpc85xx/ds1553_bus_fdt.c 209908 2010-07-11 21:08:29Z raj $");
   31 
   32 #include <sys/cdefs.h>
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 #include <sys/clock.h>
   37 #include <sys/kernel.h>
   38 #include <sys/lock.h>
   39 #include <sys/module.h>
   40 #include <sys/mutex.h>
   41 #include <sys/resource.h>
   42 #include <sys/rman.h>
   43 
   44 #include <machine/bus.h>
   45 #include <machine/resource.h>
   46 
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include "ds1553_reg.h"
   50 #include "clock_if.h"
   51 
   52 static devclass_t rtc_devclass;
   53 
   54 static int rtc_attach(device_t dev);
   55 static int rtc_probe(device_t dev);
   56 
   57 static device_method_t rtc_methods[] = {
   58         /* Device interface */
   59         DEVMETHOD(device_probe,         rtc_probe),
   60         DEVMETHOD(device_attach,        rtc_attach),
   61 
   62         /* clock interface */
   63         DEVMETHOD(clock_gettime,        ds1553_gettime),
   64         DEVMETHOD(clock_settime,        ds1553_settime),
   65 
   66         { 0, 0 }
   67 };
   68 
   69 static driver_t rtc_driver = {
   70         "rtc",
   71         rtc_methods,
   72         sizeof(struct ds1553_softc),
   73 };
   74 
   75 DRIVER_MODULE(rtc, lbc, rtc_driver, rtc_devclass, 0, 0);
   76 
   77 static int
   78 rtc_probe(device_t dev)
   79 {
   80 
   81         if (!ofw_bus_is_compatible(dev, "dallas,ds1553"))
   82                 return (ENXIO);
   83 
   84         device_set_desc(dev, "Dallas Semiconductor DS1553 RTC");
   85         return (BUS_PROBE_DEFAULT);
   86 }
   87 
   88 static int
   89 rtc_attach(device_t dev)
   90 {
   91         struct timespec ts;
   92         struct ds1553_softc *sc;
   93         int error;
   94 
   95         sc = device_get_softc(dev);
   96         bzero(sc, sizeof(struct ds1553_softc));
   97 
   98         mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
   99 
  100         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
  101             RF_ACTIVE);
  102         if (sc->res == NULL) {
  103                 device_printf(dev, "cannot allocate resources\n");
  104                 mtx_destroy(&sc->sc_mtx);
  105                 return (ENXIO);
  106         }
  107 
  108         sc->sc_bst = rman_get_bustag(sc->res);
  109         sc->sc_bsh = rman_get_bushandle(sc->res);
  110 
  111         if ((error = ds1553_attach(dev)) != 0) {
  112                 device_printf(dev, "cannot attach time of day clock\n");
  113                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  114                 mtx_destroy(&sc->sc_mtx);
  115                 return (error);
  116         }
  117 
  118         clock_register(dev, 1000000);
  119 
  120         if (bootverbose) {
  121                 ds1553_gettime(dev, &ts);
  122                 device_printf(dev, "current time: %ld.%09ld\n",
  123                     (long)ts.tv_sec, ts.tv_nsec);
  124         }
  125 
  126         return (0);
  127 }

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