FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/intersil7170.c

     /*      $NetBSD: intersil7170.c,v 1.3 2004/07/05 09:24:31 pk Exp $ */
     /*-
      * Copyright (c) 2000 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Paul Kranenburg.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *        This product includes software developed by the NetBSD
     *        Foundation, Inc. and its contributors.
     * 4. Neither the name of The NetBSD Foundation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * Intersil 7170 time-of-day chip subroutines.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: intersil7170.c,v 1.3 2004/07/05 09:24:31 pk Exp $");
    
    #include <sys/param.h>
    #include <sys/malloc.h>
    #include <sys/systm.h>
    #include <sys/errno.h>
    
    #include <machine/bus.h>
    #include <dev/clock_subr.h>
    #include <dev/ic/intersil7170.h>
    
    #define intersil_command(run, interrupt) \
            (run | interrupt | INTERSIL_CMD_FREQ_32K | INTERSIL_CMD_24HR_MODE | \
             INTERSIL_CMD_NORMAL_MODE)
    
    struct intersil7170_softc {
            bus_space_tag_t         sil_bt;
            bus_space_handle_t      sil_bh;
            int                     sil_year0;
    };
    
    int intersil7170_gettime(todr_chip_handle_t, struct timeval *);
    int intersil7170_settime(todr_chip_handle_t, struct timeval *);
    int intersil7170_getcal(todr_chip_handle_t, int *);
    int intersil7170_setcal(todr_chip_handle_t, int);
    
    int intersil7170_auto_century_adjust = 1;
    
    todr_chip_handle_t
    intersil7170_attach(bt, bh, year0)
            bus_space_tag_t bt;
            bus_space_handle_t bh;
            int year0;
    {
            todr_chip_handle_t handle;
            struct intersil7170_softc *sil;
            int sz;
    
            printf(": intersil7170");
    
            sz = ALIGN(sizeof(struct todr_chip_handle)) + sizeof(struct intersil7170);
            handle = malloc(sz, M_DEVBUF, M_NOWAIT);
            sil = (struct intersil7170_softc *)((u_long)handle +
                                            ALIGN(sizeof(struct todr_chip_handle)));
            handle->cookie = sil;
            handle->todr_gettime = intersil7170_gettime;
            handle->todr_settime = intersil7170_settime;
            handle->todr_getcal = intersil7170_getcal;
            handle->todr_setcal = intersil7170_setcal;
            sil->sil_bt = bt;
            sil->sil_bh = bh;
            sil->sil_year0 = year0;
    
            return (handle);
    }
    
    /*
    * Set up the system's time, given a `reasonable' time value.
    */
   int
   intersil7170_gettime(handle, tv)
           todr_chip_handle_t handle;
           struct timeval *tv;
   {
           struct intersil7170_softc *sil = handle->cookie;
           bus_space_tag_t bt = sil->sil_bt;
           bus_space_handle_t bh = sil->sil_bh;
           struct clock_ymdhms dt;
           u_int8_t cmd;
           int year;
           int s;
   
           /* No interrupts while we're fiddling with the chip */
           s = splhigh();
   
           /* Enable read (stop time) */
           cmd = intersil_command(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE);
           bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
   
           /* The order of reading out the clock elements is important */
           bus_space_read_1(bt, bh, INTERSIL_ICSEC);       /* not used */
           dt.dt_hour = bus_space_read_1(bt, bh, INTERSIL_IHOUR);
           dt.dt_min = bus_space_read_1(bt, bh, INTERSIL_IMIN);
           dt.dt_sec = bus_space_read_1(bt, bh, INTERSIL_ISEC);
           dt.dt_mon = bus_space_read_1(bt, bh, INTERSIL_IMON);
           dt.dt_day = bus_space_read_1(bt, bh, INTERSIL_IDAY);
           year = bus_space_read_1(bt, bh, INTERSIL_IYEAR);
           dt.dt_wday = bus_space_read_1(bt, bh, INTERSIL_IDOW);
   
           /* Done writing (time wears on) */
           cmd = intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
           bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
           splx(s);
   
           year += sil->sil_year0;
           if (year < 1970 && intersil7170_auto_century_adjust != 0)
                   year += 100;
   
           dt.dt_year = year;
   
           tv->tv_sec = clock_ymdhms_to_secs(&dt);
           tv->tv_usec = 0;
           return (0);
   }
   
   /*
    * Reset the clock based on the current time.
    */
   int
   intersil7170_settime(handle, tv)
           todr_chip_handle_t handle;
           struct timeval *tv;
   {
           struct intersil7170_softc *sil = handle->cookie;
           bus_space_tag_t bt = sil->sil_bt;
           bus_space_handle_t bh = sil->sil_bh;
           struct clock_ymdhms dt;
           u_int8_t cmd;
           int year;
           long sec;
           int s;
   
           sec = tv->tv_sec + ((tv->tv_usec < 500000) ? 0 : 1);
           clock_secs_to_ymdhms(sec, &dt);
   
           year = dt.dt_year - sil->sil_year0;
           if (year > 99 && intersil7170_auto_century_adjust != 0)
                   year -= 100;
   
           /* No interrupts while we're fiddling with the chip */
           s = splhigh();
   
           /* Enable write (stop time) */
           cmd = intersil_command(INTERSIL_CMD_STOP, INTERSIL_CMD_IENABLE);
           bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
   
           /* The order of reading writing the clock elements is important */
           bus_space_write_1(bt, bh, INTERSIL_ICSEC, 0);
           bus_space_write_1(bt, bh, INTERSIL_IHOUR, dt.dt_hour);
           bus_space_write_1(bt, bh, INTERSIL_IMIN, dt.dt_min);
           bus_space_write_1(bt, bh, INTERSIL_ISEC, dt.dt_sec);
           bus_space_write_1(bt, bh, INTERSIL_IMON, dt.dt_mon);
           bus_space_write_1(bt, bh, INTERSIL_IDAY, dt.dt_day);
           bus_space_write_1(bt, bh, INTERSIL_IYEAR, year);
           bus_space_write_1(bt, bh, INTERSIL_IDOW, dt.dt_wday);
   
           /* Done writing (time wears on) */
           cmd = intersil_command(INTERSIL_CMD_RUN, INTERSIL_CMD_IENABLE);
           bus_space_write_1(bt, bh, INTERSIL_ICMD, cmd);
           splx(s);
   
           return (0);
   }
   
   int
   intersil7170_getcal(handle, vp)
           todr_chip_handle_t handle;
           int *vp;
   {
           return (EOPNOTSUPP);
   }
   
   int
   intersil7170_setcal(handle, v)
           todr_chip_handle_t handle;
           int v;
   {
           return (EOPNOTSUPP);
   }

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