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      1 /*	$NetBSD: clock.c,v 1.6 2008/01/12 09:54:33 tsutsui Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * All advertising materials mentioning features or use of this software
     12  * must display the following acknowledgement:
     13  *	This product includes software developed by the University of
     14  *	California, Lawrence Berkeley Laboratory.
     15  *
     16  * Redistribution and use in source and binary forms, with or without
     17  * modification, are permitted provided that the following conditions
     18  * are met:
     19  * 1. Redistributions of source code must retain the above copyright
     20  *    notice, this list of conditions and the following disclaimer.
     21  * 2. Redistributions in binary form must reproduce the above copyright
     22  *    notice, this list of conditions and the following disclaimer in the
     23  *    documentation and/or other materials provided with the distribution.
     24  * 3. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  *	@(#)clock.c	8.1 (Berkeley) 6/11/93
     41  */
     42 
     43 /*
     44  * Copyright (c) 1994 Gordon W. Ross
     45  * Copyright (c) 1993 Adam Glass
     46  *
     47  * This software was developed by the Computer Systems Engineering group
     48  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     49  * contributed to Berkeley.
     50  *
     51  * All advertising materials mentioning features or use of this software
     52  * must display the following acknowledgement:
     53  *	This product includes software developed by the University of
     54  *	California, Lawrence Berkeley Laboratory.
     55  *
     56  * Redistribution and use in source and binary forms, with or without
     57  * modification, are permitted provided that the following conditions
     58  * are met:
     59  * 1. Redistributions of source code must retain the above copyright
     60  *    notice, this list of conditions and the following disclaimer.
     61  * 2. Redistributions in binary form must reproduce the above copyright
     62  *    notice, this list of conditions and the following disclaimer in the
     63  *    documentation and/or other materials provided with the distribution.
     64  * 3. All advertising materials mentioning features or use of this software
     65  *    must display the following acknowledgement:
     66  *	This product includes software developed by the University of
     67  *	California, Berkeley and its contributors.
     68  * 4. Neither the name of the University nor the names of its contributors
     69  *    may be used to endorse or promote products derived from this software
     70  *    without specific prior written permission.
     71  *
     72  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     73  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     74  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     75  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     76  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     77  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     78  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     79  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     80  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     81  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     82  * SUCH DAMAGE.
     83  *
     84  *	@(#)clock.c	8.1 (Berkeley) 6/11/93
     85  */
     86 
     87 /*
     88  * Clock driver.
     89  */
     90 
     91 #include "sboot.h"
     92 #include "clockreg.h"
     93 
     94 #include <machine/prom.h>
     95 #include "libsa.h"
     96 
     97 static struct clockreg *clockreg = (struct clockreg *)CLOCK_ADDR;
     98 
     99 /*
    100  * Set up the system's time, given a `reasonable' time value.
    101  */
    102 u_long time(void)
    103 {
    104 	struct clockreg *cl = clockreg;
    105 	int sec, min, hour, day, mon, year;
    106 
    107 	cl->cl_csr |= CLK_READ;		/* enable read (stop time) */
    108 	sec = cl->cl_sec;
    109 	min = cl->cl_min;
    110 	hour = cl->cl_hour;
    111 	day = cl->cl_mday;
    112 	mon = cl->cl_month;
    113 	year = cl->cl_year;
    114 	cl->cl_csr &= ~CLK_READ;	/* time wears on */
    115 	return chiptotime(sec, min, hour, day, mon, year);
    116 }
    117