sys/arch/hp700/dev/clock.c

   1 /*      $NetBSD: clock.c,v 1.6 2006/09/16 15:43:24 skrll Exp $  */
   2
   3 /*      $OpenBSD: clock.c,v 1.10 2001/08/31 03:13:42 mickey Exp $       */
   4
   5 /*
   6  * Copyright (c) 1998-2003 Michael Shalayeff
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
  22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  28  * THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.6 2006/09/16 15:43:24 skrll Exp $");
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/time.h>
  38 #include <sys/timetc.h>
  39
  40 #include <machine/pdc.h>
  41 #include <machine/iomod.h>
  42 #include <machine/psl.h>
  43 #include <machine/intr.h>
  44 #include <machine/reg.h>
  45 #include <machine/cpufunc.h>
  46 #include <machine/autoconf.h>
  47
  48 #include <hp700/hp700/machdep.h>
  49
  50 #if defined(DDB)
  51 #include <machine/db_machdep.h>
  52 #include <ddb/db_sym.h>
  53 #include <ddb/db_extern.h>
  54 #endif
  55
  56 static unsigned get_itimer_count(struct timecounter *);
  57
  58 void
  59 cpu_initclocks(void)
  60 {
  61         static struct timecounter tc = {
  62                 .tc_get_timecount = get_itimer_count,
  63                 .tc_name = "itimer",
  64                 .tc_counter_mask = ~0,
  65                 .tc_quality = 100,
  66         };
  67
  68         extern u_int cpu_hzticks;
  69         u_int time_inval;
  70
  71         tc.tc_frequency = cpu_hzticks * hz;
  72
  73         /* Start the interval timer. */
  74         mfctl(CR_ITMR, time_inval);
  75         mtctl(time_inval + cpu_hzticks, CR_ITMR);
  76
  77         tc_init(&tc);
  78 }
  79
  80 unsigned
  81 get_itimer_count(struct timecounter *tc)
  82 {
  83         uint32_t val;
  84
  85         mfctl(CR_ITMR, val);
  86
  87         return val;
  88 }
  89
  90 int
  91 clock_intr(void *v)
  92 {
  93         struct clockframe *frame = v;
  94         extern u_int cpu_hzticks;
  95         u_int time_inval;
  96
  97         /* Restart the interval timer. */
  98         mfctl(CR_ITMR, time_inval);
  99         mtctl(time_inval + cpu_hzticks, CR_ITMR);
 100
 101         /* printf ("clock int 0x%x @ 0x%x for %p\n", t,
 102            CLKF_PC(frame), curproc); */
 103
 104         if (!cold)
 105                 hardclock(frame);
 106
 107 #if 0
 108         ddb_regs = *frame;
 109         db_show_regs(NULL, 0, 0, NULL);
 110 #endif
 111
 112         /* printf ("clock out 0x%x\n", t); */
 113
 114         return 1;
 115 }
 116
 117 void
 118 setstatclockrate(int newhz)
 119 {
 120         /* nothing we can do */
 121 }
 122