1/* $NetBSD: clock.c,v 1.6 2024/01/07 07:58:34 isaki Exp $ */
2
3/*
4 * Copyright (c) 2003 Tetsuya Isaki. 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,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/types.h>
29#include <sys/clock.h>
30#include <lib/libsa/stand.h>
31#include <lib/libsa/net.h>
32#include "iocs.h"
33#include "libx68k.h"
34#include "consio.h"	/* XXX: for MFP_TIMERC */
35
36/* x68k's RTC is defunct 2079, so there is no y2100 problem. */
37
38int rtc_offset;
39
40const int yday[] = {
41	0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
42};
43
44satime_t
45getsecs(void)
46{
47	int val;
48	int sec, min, hour, day, mon, year;
49	int days, y;
50
51	/* Get date & time via IOCS */
52	val  = IOCS_DATEBIN(IOCS_BINDATEGET());
53	year = ((val & 0x0fff0000) >> 16) + 1980;
54	mon  = ((val & 0x0000ff00) >>  8);
55	day  =  (val & 0x000000ff);
56
57	val  = IOCS_TIMEBIN(IOCS_TIMEGET());
58	hour = ((val & 0x00ff0000) >> 16);
59	min  = ((val & 0x0000ff00) >>  8);
60	sec  =  (val & 0x000000ff);
61
62	/* simple sanity checks */
63	if (mon < 1 || mon > 12 || day < 1 || day > 31)
64		return 0;
65	if (hour > 23 || min > 59 || sec > 59)
66		return 0;
67
68	days = 0;
69	for (y = 1970; y < year; y++)
70		days += days_per_year(y);
71	days += yday[mon - 1] + day - 1;
72	if (is_leap_year(y) && mon > 2)
73		days++;
74
75	/* now we have days since Jan 1, 1970. the rest is easy... */
76	return (days * SECS_PER_DAY) + (hour * SECS_PER_HOUR)
77	    + (min * SECS_PER_MINUTE) + sec + (rtc_offset * 60);
78}
79
80void
81delay(int us)
82{
83	int end;
84
85	/* sanity check */
86	if (us < 1)
87		return;
88
89	/*
90	 * assume IPLROM initializes MFP Timer-C as following:
91	 *  - free run down count
92	 *  - 1/200 presclaer (50us with 4MHz clock)
93	 *
94	 * Note we can't change MFP_TCDR reload value (200)
95	 * because awaitkey_1sec() in consio.c assumes that value.
96	 */
97
98	/* handle >5ms delays first */
99	for (; us > 5000; us -= 5000) {
100		MFP_TIMERC = 200;
101		while (MFP_TIMERC >= 100)
102			continue;
103	}
104
105	/* count rest fractions */
106	end = 200 - (us / 50);
107	MFP_TIMERC = 200;
108	while (MFP_TIMERC >= end)
109		continue;
110}
111