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      1 /*	$NetBSD: clock.c,v 1.24 2011/02/20 07:59:51 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department, Ralph Campbell, and Kazumasa Utashiro of
     11  * Software Research Associates, Inc.
     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) 6/11/93
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.24 2011/02/20 07:59:51 matt Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/device.h>
     47 #include <sys/kernel.h>
     48 #include <sys/systm.h>
     49 #include <sys/cpu.h>
     50 #include <machine/sysconf.h>
     51 
     52 #include <mips/locore.h>
     53 #include <mips/mips3_clock.h>
     54 #include <dev/clock_subr.h>
     55 #include <dev/ic/i8253reg.h>
     56 
     57 #include <machine/machtype.h>
     58 #include <sgimips/sgimips/clockvar.h>
     59 
     60 uint32_t next_clk_intr;
     61 uint32_t missed_clk_intrs;
     62 
     63 void mips3_clock_intr(vaddr_t, uint32_t, uint32_t);
     64 
     65 /*
     66  * Machine-dependent clock routines.
     67  */
     68 
     69 /*
     70  * We assume newhz is either stathz or profhz, and that neither will
     71  * change after being set up above.  Could recalculate intervals here
     72  * but that would be a drag.
     73  */
     74 void
     75 setstatclockrate(int newhz)
     76 {
     77 
     78 	/* do something? */
     79 }
     80 
     81 /*
     82  * Set up the real-time and statistics clocks.  Leave stathz 0 only if
     83  * no alternative timer is available.
     84  */
     85 void
     86 cpu_initclocks(void)
     87 {
     88 
     89 	switch (mach_type) {
     90 #if defined(MIPS1)
     91 	case MACH_SGI_IP6 | MACH_SGI_IP10:
     92 	case MACH_SGI_IP12:
     93 		/* int(4) will take care of our clocks */
     94 		/* enable hardware interrupts including hardclock(9) */
     95 		spl0();
     96 		break;
     97 #endif /* MIPS1 */
     98 #if defined(MIPS3)
     99 	case MACH_SGI_IP20:
    100 	case MACH_SGI_IP22:
    101 	case MACH_SGI_IP30:
    102 	case MACH_SGI_IP32:
    103 		mips3_initclocks();
    104 		break;
    105 #endif /* MIPS3 */
    106 	default:
    107 		panic("cpu_initclocks(): unknown mach_type IP%d", mach_type);
    108 		break;
    109 	}
    110 }
    111 
    112 #if defined(MIPS3)
    113 void
    114 mips3_clock_intr(vaddr_t pc, uint32_t status, uint32_t pending)
    115 {
    116 	struct clockframe cf;
    117 
    118 	cf.pc = pc;
    119 	cf.sr = status;
    120 	cf.intr = (curcpu()->ci_idepth > 1);
    121 	mips3_clockintr(&cf);
    122 }
    123 
    124 #endif /* MIPS3 */
    125