mc146818.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*      $NetBSD: mc146818.c,v 1.12.4.1 2008/12/13 21:04:07 bouyer Exp $ */
    2 
    3 /*
    4  * Copyright (c) 2003 Izumi Tsutsui.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 /*
   30  * mc146818 and compatible time of day chip subroutines
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: mc146818.c,v 1.12.4.1 2008/12/13 21:04:07 bouyer Exp $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/device.h>
   39 #include <sys/errno.h>
   40 
   41 #include <machine/bus.h>
   42 
   43 #include <dev/clock_subr.h>
   44 
   45 #include <dev/ic/mc146818reg.h>
   46 #include <dev/ic/mc146818var.h>
   47 
   48 int mc146818_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
   49 int mc146818_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
   50 
   51 void
   52 mc146818_attach(struct mc146818_softc *sc)
   53 {
   54         todr_chip_handle_t handle;
   55 
   56 #ifdef DIAGNOSTIC
   57         if (sc->sc_mcread == NULL ||
   58             sc->sc_mcwrite == NULL)
   59                 panic("mc146818_attach: invalid read/write functions");
   60 #endif
   61 
   62         printf(": mc146818 compatible time-of-day clock");
   63 
   64         handle = &sc->sc_handle;
   65         handle->cookie = sc;
   66         handle->todr_gettime = NULL;
   67         handle->todr_settime = NULL;
   68         handle->todr_gettime_ymdhms = mc146818_gettime_ymdhms;
   69         handle->todr_settime_ymdhms = mc146818_settime_ymdhms;
   70         handle->todr_setwen  = NULL;
   71 }
   72 
   73 /*
   74  * todr_gettime function:
   75  *  Get time of day and convert it to a struct timeval.
   76  *  Return 0 on success, an error number othersize.
   77  */
   78 int
   79 mc146818_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
   80 {
   81         struct mc146818_softc *sc;
   82         int s, timeout, cent, year;
   83 
   84         sc = handle->cookie;
   85 
   86         s = splclock();         /* XXX really needed? */
   87 
   88         todr_wenable(handle, 1);
   89 
   90         timeout = 1000000;      /* XXX how long should we wait? */
   91         for (;;) {
   92                 if (((*sc->sc_mcread)(sc, MC_REGA) & MC_REGA_UIP) == 0)
   93                         break;
   94                 if (--timeout < 0) {
   95                         printf("mc146818_gettime: timeout\n");
   96                         return EBUSY;
   97                 }
   98         }
   99 
  100 #define FROMREG(x)      ((sc->sc_flag & MC146818_BCD) ? FROMBCD(x) : (x))
  101 
  102         dt->dt_sec  = FROMREG((*sc->sc_mcread)(sc, MC_SEC));
  103         dt->dt_min  = FROMREG((*sc->sc_mcread)(sc, MC_MIN));
  104         dt->dt_hour = FROMREG((*sc->sc_mcread)(sc, MC_HOUR));
  105         dt->dt_wday = FROMREG((*sc->sc_mcread)(sc, MC_DOW));
  106         dt->dt_day  = FROMREG((*sc->sc_mcread)(sc, MC_DOM));
  107         dt->dt_mon  = FROMREG((*sc->sc_mcread)(sc, MC_MONTH));
  108         year       = FROMREG((*sc->sc_mcread)(sc, MC_YEAR));
  109         if (sc->sc_getcent) {
  110                 cent = (*sc->sc_getcent)(sc);
  111                 year += cent * 100;
  112         }
  113 
  114 #undef FROMREG
  115 
  116         year += sc->sc_year0;
  117         if (year < POSIX_BASE_YEAR &&
  118             (sc->sc_flag & MC146818_NO_CENT_ADJUST) == 0)
  119                 year += 100;
  120         dt->dt_year = year;
  121 
  122         todr_wenable(handle, 0);
  123 
  124         splx(s);
  125 
  126         return 0;
  127 }
  128 
  129 /*
  130  * todr_settime function:
  131  *  Set the time of day clock based on the value of the struct timeval arg.
  132  *  Return 0 on success, an error number othersize.
  133  */
  134 int
  135 mc146818_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
  136 {
  137         struct mc146818_softc *sc;
  138         int s, cent, year;
  139 
  140         sc = handle->cookie;
  141 
  142         s = splclock();         /* XXX really needed? */
  143 
  144         todr_wenable(handle, 1);
  145 
  146         /*
  147          * Disable RTC updates during clock updates
  148          */
  149 
  150         (*sc->sc_mcwrite)(sc, MC_REGB,
  151             (*sc->sc_mcread)(sc, MC_REGB) | MC_REGB_SET);
  152 
  153 #define TOREG(x)        ((sc->sc_flag & MC146818_BCD) ? TOBCD(x) : (x))
  154 
  155         (*sc->sc_mcwrite)(sc, MC_SEC, TOREG(dt->dt_sec));
  156         (*sc->sc_mcwrite)(sc, MC_MIN, TOREG(dt->dt_min));
  157         (*sc->sc_mcwrite)(sc, MC_HOUR, TOREG(dt->dt_hour));
  158         (*sc->sc_mcwrite)(sc, MC_DOW, TOREG(dt->dt_wday));
  159         (*sc->sc_mcwrite)(sc, MC_DOM, TOREG(dt->dt_day));
  160         (*sc->sc_mcwrite)(sc, MC_MONTH, TOREG(dt->dt_mon));
  161 
  162         year = dt->dt_year - sc->sc_year0;
  163         if (sc->sc_setcent) {
  164                 cent = year / 100;
  165                 (*sc->sc_setcent)(sc, cent);
  166                 year -= cent * 100;
  167         }
  168         if (year > 99 &&
  169             (sc->sc_flag & MC146818_NO_CENT_ADJUST) == 0)
  170                 year -= 100;
  171         (*sc->sc_mcwrite)(sc, MC_YEAR, TOREG(year));
  172 
  173 #undef TOREG
  174 
  175         /*
  176          * Re-enable RTC updates
  177          */
  178 
  179         (*sc->sc_mcwrite)(sc, MC_REGB,
  180             (*sc->sc_mcread)(sc, MC_REGB) & ~MC_REGB_SET);
  181 
  182         todr_wenable(handle, 0);
  183 
  184         splx(s);
  185 
  186         return 0;
  187 }

Cache object: ccf70507a09c97e40d36554243bf6de3

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/dev/ic/mc146818.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/mc146818.c