pmtimer.c revision 65865 
1/*-
2 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	$FreeBSD: head/sys/i386/isa/pmtimer.c 65865 2000-09-14 22:34:57Z iwasaki $
27 */
28
29/*
30 * Timer device driver for power management events.
31 * The code for suspend/resume is derived from APM device driver.
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/bus.h>
37#include <sys/kernel.h>
38#include <sys/syslog.h>
39#include <machine/clock.h>
40
41#include <isa/isavar.h>
42
43/* reject any PnP devices for now */
44static struct isa_pnp_id pmtimer_ids[] = {
45	{0}
46};
47
48static int
49pmtimer_probe(device_t dev)
50{
51
52	if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
53		return (ENXIO);
54	}
55
56	/* only one instance always */
57	return (device_get_unit(dev));
58}
59
60static struct timeval suspend_time;
61static struct timeval diff_time;
62
63static int
64pmtimer_suspend(device_t dev)
65{
66	int	pl;
67
68	pl = splsoftclock();
69	microtime(&diff_time);
70	inittodr(0);
71	microtime(&suspend_time);
72	timevalsub(&diff_time, &suspend_time);
73	splx(pl);
74	return (0);
75}
76
77static int
78pmtimer_resume(device_t dev)
79{
80	int pl;
81	u_int second, minute, hour;
82	struct timeval resume_time, tmp_time;
83
84	/* modified for adjkerntz */
85	pl = splsoftclock();
86	i8254_restore();		/* restore timer_freq and hz */
87	inittodr(0);			/* adjust time to RTC */
88	microtime(&resume_time);
89	getmicrotime(&tmp_time);
90	timevaladd(&tmp_time, &diff_time);
91
92#ifdef FIXME
93	/* XXX THIS DOESN'T WORK!!! */
94	time = tmp_time;
95#endif
96
97#ifdef PMTIMER_FIXUP_CALLTODO
98	/* Calculate the delta time suspended */
99	timevalsub(&resume_time, &suspend_time);
100	/* Fixup the calltodo list with the delta time. */
101	adjust_timeout_calltodo(&resume_time);
102#endif /* PMTIMER_FIXUP_CALLTODOK */
103	splx(pl);
104#ifndef PMTIMER_FIXUP_CALLTODO
105	second = resume_time.tv_sec - suspend_time.tv_sec;
106#else /* PMTIMER_FIXUP_CALLTODO */
107	/*
108	 * We've already calculated resume_time to be the delta between
109	 * the suspend and the resume.
110	 */
111	second = resume_time.tv_sec;
112#endif /* PMTIMER_FIXUP_CALLTODO */
113	hour = second / 3600;
114	second %= 3600;
115	minute = second / 60;
116	second %= 60;
117	log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
118		hour, minute, second);
119	return (0);
120}
121
122static device_method_t pmtimer_methods[] = {
123	/* Device interface */
124	DEVMETHOD(device_probe,		pmtimer_probe),
125	DEVMETHOD(device_attach,	bus_generic_attach),
126	DEVMETHOD(device_suspend,	pmtimer_suspend),
127	DEVMETHOD(device_resume,	pmtimer_resume),
128	{ 0, 0 }
129};
130
131static driver_t pmtimer_driver = {
132	"pmtimer",
133	pmtimer_methods,
134	1,		/* no softc */
135};
136
137static devclass_t pmtimer_devclass;
138
139DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);
140