ds1553_bus_fdt.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (C) 2006-2008 Semihalf, Grzegorz Bernacki
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * From: FreeBSD: src/sys/powerpc/mpc85xx/ds1553_bus_lbc.c,v 1.2 2009/06/24 15:48:20 raj
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/cdefs.h>
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/bus.h>
   38 #include <sys/clock.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/module.h>
   42 #include <sys/mutex.h>
   43 #include <sys/resource.h>
   44 #include <sys/rman.h>
   45 
   46 #include <machine/bus.h>
   47 #include <machine/resource.h>
   48 
   49 #include <dev/ofw/ofw_bus_subr.h>
   50 
   51 #include "ds1553_reg.h"
   52 #include "clock_if.h"
   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         { 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, 0, 0);
   75 
   76 static int
   77 rtc_probe(device_t dev)
   78 {
   79 
   80         if (!ofw_bus_is_compatible(dev, "dallas,ds1553"))
   81                 return (ENXIO);
   82 
   83         device_set_desc(dev, "Dallas Semiconductor DS1553 RTC");
   84         return (BUS_PROBE_DEFAULT);
   85 }
   86 
   87 static int
   88 rtc_attach(device_t dev)
   89 {
   90         struct timespec ts;
   91         struct ds1553_softc *sc;
   92         int error;
   93 
   94         sc = device_get_softc(dev);
   95         bzero(sc, sizeof(struct ds1553_softc));
   96 
   97         mtx_init(&sc->sc_mtx, "rtc_mtx", NULL, MTX_SPIN);
   98 
   99         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
  100             RF_ACTIVE);
  101         if (sc->res == NULL) {
  102                 device_printf(dev, "cannot allocate resources\n");
  103                 mtx_destroy(&sc->sc_mtx);
  104                 return (ENXIO);
  105         }
  106 
  107         sc->sc_bst = rman_get_bustag(sc->res);
  108         sc->sc_bsh = rman_get_bushandle(sc->res);
  109 
  110         if ((error = ds1553_attach(dev)) != 0) {
  111                 device_printf(dev, "cannot attach time of day clock\n");
  112                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  113                 mtx_destroy(&sc->sc_mtx);
  114                 return (error);
  115         }
  116 
  117         clock_register(dev, 1000000);
  118 
  119         if (bootverbose) {
  120                 ds1553_gettime(dev, &ts);
  121                 device_printf(dev, "current time: %ld.%09ld\n",
  122                     (long)ts.tv_sec, ts.tv_nsec);
  123         }
  124 
  125         return (0);
  126 }

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/mpc85xx/ds1553_bus_fdt.c

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/mpc85xx/ds1553_bus_fdt.c