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      1 /* $NetBSD: timer.c,v 1.12 2023/08/30 17:10:17 tsutsui Exp $ */
      2 /* NetBSD: clock.c,v 1.31 2001/05/27 13:53:24 sommerfeld Exp  */
      3 
      4 /*
      5  * Copyright (c) 1988 University of Utah.
      6  * Copyright (c) 1992, 1993
      7  *	The Regents of the University of California.  All rights reserved.
      8  *
      9  * This code is derived from software contributed to Berkeley by
     10  * the Systems Programming Group of the University of Utah Computer
     11  * Science Department and Ralph Campbell.
     12  *
     13  * Redistribution and use in source and binary forms, with or without
     14  * modification, are permitted provided that the following conditions
     15  * are met:
     16  * 1. Redistributions of source code must retain the above copyright
     17  *    notice, this list of conditions and the following disclaimer.
     18  * 2. Redistributions in binary form must reproduce the above copyright
     19  *    notice, this list of conditions and the following disclaimer in the
     20  *    documentation and/or other materials provided with the distribution.
     21  * 3. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  * from: Utah Hdr: clock.c 1.18 91/01/21
     38  *
     39  *	@(#)clock.c	8.1 (Berkeley) 6/10/93
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: timer.c,v 1.12 2023/08/30 17:10:17 tsutsui Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/kernel.h>
     47 #include <sys/systm.h>
     48 
     49 #include <mips/locore.h>
     50 #include <mips/mips3_clock.h>
     51 
     52 #include <arc/arc/timervar.h>
     53 
     54 device_t timerdev;
     55 const struct timerfns *timerfns;
     56 int timerinitted;
     57 uint32_t last_cp0_count;
     58 
     59 void
     60 timerattach(device_t dev, const struct timerfns *fns)
     61 {
     62 
     63 	/*
     64 	 * Just bookkeeping.
     65 	 */
     66 
     67 	if (timerfns != NULL)
     68 		panic("timerattach: multiple timers");
     69 	timerdev = dev;
     70 	timerfns = fns;
     71 }
     72 
     73 /*
     74  * Machine-dependent clock routines.
     75  */
     76 
     77 /*
     78  * Start the real-time and statistics clocks. Leave stathz 0 since there
     79  * are no other timers available.
     80  */
     81 void
     82 cpu_initclocks(void)
     83 {
     84 
     85 	if (timerfns == NULL)
     86 		panic("cpu_initclocks: no timer attached");
     87 
     88 	/*
     89 	 * Get the clock started.
     90 	 */
     91 	(*timerfns->tf_init)(timerdev);
     92 
     93 	/* init timecounter */
     94 	mips3_init_tc();
     95 }
     96 
     97 /*
     98  * This does not need to do anything, as we don't use a timer for statclock
     99  * and profhz == stathz == hz.
    100  */
    101 void
    102 setstatclockrate(int newhz)
    103 {
    104 
    105 	/* nothing to do */
    106 }
    107