1 /* $NetBSD: clock.c,v 1.14 2023/02/03 23:13:01 tsutsui Exp $ */
2 /*
3 * Copyright (c) 1998 Darrin B. Jewell
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.14 2023/02/03 23:13:01 tsutsui Exp $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/tty.h>
34 #include <sys/device.h>
35
36 #include <machine/psl.h>
37 #include <machine/bus.h>
38 #include <machine/cpu.h>
39
40 #include <next68k/dev/clockreg.h>
41 #include <next68k/dev/intiovar.h>
42
43 #include <next68k/next68k/rtc.h>
44 #include <next68k/next68k/isr.h>
45
46 /* @@@ This is pretty bogus and will need fixing once
47 * things are working better.
48 * -- jewell@mit.edu
49 */
50
51 int clock_intr(void *);
52
53 int
clock_intr(void * arg)54 clock_intr(void *arg)
55 {
56 volatile struct timer_reg *timer;
57 int whilecount = 0;
58
59 if (!INTR_OCCURRED(NEXT_I_TIMER)) {
60 return 0;
61 }
62
63 do {
64 static int in_hardclock = 0;
65 int s;
66
67 timer = (volatile struct timer_reg *)IIOV(NEXT_P_TIMER);
68 timer->csr |= TIMER_REG_UPDATE;
69
70 if (!in_hardclock) {
71 in_hardclock = 1;
72 s = splclock ();
73 hardclock(arg);
74 splx(s);
75 in_hardclock = 0;
76 }
77 if (whilecount++ > 10)
78 panic ("whilecount");
79 } while (INTR_OCCURRED(NEXT_I_TIMER));
80 return 1;
81 }
82
83 /*
84 * Set up the real-time and statistics clocks. Leave stathz 0 only
85 * if no alternative timer is available.
86 *
87 * The frequencies of these clocks must be an even number of microseconds.
88 */
89 void
cpu_initclocks(void)90 cpu_initclocks(void)
91 {
92 int s, cnt;
93 volatile struct timer_reg *timer;
94
95 rtc_init();
96 hz = 100;
97 s = splclock();
98 timer = (volatile struct timer_reg *)IIOV(NEXT_P_TIMER);
99 cnt = 1000000/hz; /* usec timer */
100 timer->csr = 0;
101 timer->msb = (cnt >> 8);
102 timer->lsb = cnt;
103 timer->csr = TIMER_REG_ENABLE|TIMER_REG_UPDATE;
104 isrlink_autovec(clock_intr, NULL, NEXT_I_IPL(NEXT_I_TIMER), 0, NULL);
105 INTR_ENABLE(NEXT_I_TIMER);
106 splx(s);
107 }
108
109
110 void
setstatclockrate(int newhz)111 setstatclockrate(int newhz)
112 {
113
114 /* XXX should we do something here? XXX */
115 }
116
117 /*
118 * @@@ update this to use the usec timer
119 * Darrin B Jewell <jewell@mit.edu> Sun Feb 8 05:01:02 1998
120 * XXX: Well, there is no more microtime. But if there is a hardware
121 * timer of any sort, it could be added. ENODOCS. gdamore.
122 */
123
124