1 /* $NetBSD: clock.c,v 1.22 2011/03/16 14:43:36 tsutsui Exp $ */
2
3 /*-
4 * Copyright (c) 1999 Shin Takemura, All rights reserved.
5 * Copyright (c) 1999-2001 SATO Kazumi, All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 */
31
32 /*
33 * Copyright (c) 1988 University of Utah.
34 * Copyright (c) 1992, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * the Systems Programming Group of the University of Utah Computer
39 * Science Department and Ralph Campbell.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * from: Utah Hdr: clock.c 1.18 91/01/21
66 *
67 * @(#)clock.c 8.1 (Berkeley) 6/10/93
68 */
69
70 #include <sys/cdefs.h>
71 __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.22 2011/03/16 14:43:36 tsutsui Exp $");
72
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/kernel.h> /* hz */
76
77 #include <dev/clock_subr.h>
78 #include <machine/sysconf.h> /* platform */
79
80 /*
81 * platform_clock_attach:
82 *
83 * Register CPU(VR41XX or TX39XX) dependent clock routine to system.
84 */
85 void
platform_clock_attach(device_t dev,struct platform_clock * clock)86 platform_clock_attach(device_t dev, struct platform_clock *clock)
87 {
88
89 printf("\n");
90
91 clock->self = dev;
92 platform.clock = clock;
93 }
94
95 /*
96 * cpu_initclocks:
97 *
98 * starts periodic timer, which provides hardclock interrupts to
99 * kern_clock.c.
100 * Leave stathz 0 since there are no other timers available.
101 */
102 void
cpu_initclocks(void)103 cpu_initclocks(void)
104 {
105 struct platform_clock *clock = platform.clock;
106
107 if (clock == NULL)
108 panic("cpu_initclocks: no clock attached");
109
110 hz = clock->hz;
111 tick = 1000000 / hz;
112
113 /* start periodic timer */
114 (*clock->init)(clock->self);
115 }
116
117 /*
118 * setstatclockrate:
119 *
120 * We assume newhz is either stathz or profhz, and that neither will
121 * change after being set up above. Could recalculate intervals here
122 * but that would be a drag.
123 */
124 void
setstatclockrate(int newhz)125 setstatclockrate(int newhz)
126 {
127
128 /* nothing we can do */
129 }
130
131 /*
132 * delay:
133 *
134 * Wait at least "n" microseconds.
135 */
136 void
delay(int n)137 delay(int n)
138 {
139
140 DELAY(n);
141 }
142