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      1 /*      $NetBSD: clock.c,v 1.17 2006/09/09 03:14:18 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 #include <sys/cdefs.h>
     44 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.17 2006/09/09 03:14:18 tsutsui Exp $");
     45 
     46 #include <sys/param.h>
     47 #include <sys/kernel.h>
     48 #include <sys/systm.h>
     49 #include <sys/device.h>
     50 
     51 #include <news68k/news68k/clockvar.h>
     52 
     53 #include <machine/cpu.h>
     54 
     55 static	void (*cpu_initclocks_hook)(int, int);
     56 
     57 void
     58 timer_config(void (*initfunc)(int, int))
     59 {
     60 
     61 	if (cpu_initclocks_hook)
     62 		panic("clock_config: too many timers configured");
     63 
     64 	cpu_initclocks_hook = initfunc;
     65 }
     66 
     67 /*
     68  * Set up the real-time and statistics clocks.  Leave stathz 0 only
     69  * if no alternative timer is available.
     70  *
     71  * The frequencies of these clocks must be an even number of microseconds.
     72  */
     73 void
     74 cpu_initclocks(void)
     75 {
     76 
     77 	if (cpu_initclocks_hook == NULL)
     78 		panic("no timer device configured");
     79 
     80 	if (1000000 % hz) {
     81 		printf("cannot get %d Hz clock; using 100 Hz\n", hz);
     82 		hz = 100;
     83 		tick = 1000000 / hz;
     84 	}
     85 
     86 	/* Call the machine-specific initclocks hook. */
     87 
     88 	(*cpu_initclocks_hook)(0, 0);
     89 }
     90 
     91 /*
     92  * This does not need to do anything, as we have only one timer and
     93  * profhz == stathz == hz.
     94  */
     95 void
     96 setstatclockrate(int newhz)
     97 {
     98 
     99 	/* nothing to do */
    100 }
    101