clock.c revision 1.1 
1/* $NetBSD: clock.c,v 1.1 2012/10/12 20:15:52 tsutsui Exp $ */
2/* Id: clock.c,v 1.4 2011/04/10 09:21:45 isaki Exp  */
3
4/*
5 * Copyright (c) 2003 Tetsuya Isaki. 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/types.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#define LEAPYEAR(y)	(((y) % 4) == 0)
38#define SECDAY	(24 * 60 * 60)
39
40int rtc_offset;
41
42const int yday[] = {
43	0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
44};
45
46satime_t
47getsecs(void)
48{
49	int val;
50	int sec, min, hour, day, mon, year;
51	int days, y;
52
53	/* Get date & time via IOCS */
54	val  = IOCS_DATEBIN(IOCS_BINDATEGET());
55	year = ((val & 0x0fff0000) >> 16) + 1980;
56	mon  = ((val & 0x0000ff00) >>  8);
57	day  =  (val & 0x000000ff);
58
59	val  = IOCS_TIMEBIN(IOCS_TIMEGET());
60	hour = ((val & 0x00ff0000) >> 16);
61	min  = ((val & 0x0000ff00) >>  8);
62	sec  =  (val & 0x000000ff);
63
64	/* simple sanity checks */
65	if (mon < 1 || mon > 12 || day < 1 || day > 31)
66		return 0;
67	if (hour > 23 || min > 59 || sec > 59)
68		return 0;
69
70	days = 0;
71	for (y = 1970; y < year; y++)
72		days += 365 + LEAPYEAR(y);
73	days += yday[mon - 1] + day - 1;
74	if (LEAPYEAR(y) && mon > 2)
75		days++;
76
77	/* now we have days since Jan 1, 1970. the rest is easy... */
78	return (days * SECDAY) + (hour * 3600) + (min * 60) + sec
79		+ (rtc_offset * 60);
80}
81
82void
83delay(int us)
84{
85	int end;
86
87	/* sanity check */
88	if (us < 1)
89		return;
90
91	/*
92	 * assume IPLROM initializes MFP Timer-C as following:
93	 *  - free run down count
94	 *  - 1/200 presclaer (50us with 4MHz clock)
95	 *
96	 * Note we can't change MFP_TCDR reload value (200)
97	 * because awaitkey_1sec() in consio.c assumes that value.
98	 */
99
100	/* handle >5ms delays first */
101	for (; us > 5000; us -= 5000) {
102		MFP_TIMERC = 200;
103		while (MFP_TIMERC >= 100)
104			continue;
105	}
106
107	/* count rest fractions */
108	end = 200 - (us / 50);
109	MFP_TIMERC = 200;
110	while (MFP_TIMERC >= end)
111		continue;
112}
113