clock.c revision 1.2 
1/* $NetBSD: clock.c,v 1.2 2012/11/01 14:46:26 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 <lib/libsa/stand.h>
30#include <lib/libsa/net.h>
31#include "iocs.h"
32#include "libx68k.h"
33#include "consio.h"	/* XXX: for MFP_TIMERC */
34
35/* x68k's RTC is defunct 2079, so there is no y2100 problem. */
36#define LEAPYEAR(y)	(((y) % 4) == 0)
37#define SECDAY	(24 * 60 * 60)
38
39int rtc_offset;
40
41const int yday[] = {
42	0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
43};
44
45satime_t
46getsecs(void)
47{
48	int val;
49	int sec, min, hour, day, mon, year;
50	int days, y;
51
52	/* Get date & time via IOCS */
53	val  = IOCS_DATEBIN(IOCS_BINDATEGET());
54	year = ((val & 0x0fff0000) >> 16) + 1980;
55	mon  = ((val & 0x0000ff00) >>  8);
56	day  =  (val & 0x000000ff);
57
58	val  = IOCS_TIMEBIN(IOCS_TIMEGET());
59	hour = ((val & 0x00ff0000) >> 16);
60	min  = ((val & 0x0000ff00) >>  8);
61	sec  =  (val & 0x000000ff);
62
63	/* simple sanity checks */
64	if (mon < 1 || mon > 12 || day < 1 || day > 31)
65		return 0;
66	if (hour > 23 || min > 59 || sec > 59)
67		return 0;
68
69	days = 0;
70	for (y = 1970; y < year; y++)
71		days += 365 + LEAPYEAR(y);
72	days += yday[mon - 1] + day - 1;
73	if (LEAPYEAR(y) && mon > 2)
74		days++;
75
76	/* now we have days since Jan 1, 1970. the rest is easy... */
77	return (days * SECDAY) + (hour * 3600) + (min * 60) + sec
78		+ (rtc_offset * 60);
79}
80
81void
82delay(int us)
83{
84	int end;
85
86	/* sanity check */
87	if (us < 1)
88		return;
89
90	/*
91	 * assume IPLROM initializes MFP Timer-C as following:
92	 *  - free run down count
93	 *  - 1/200 presclaer (50us with 4MHz clock)
94	 *
95	 * Note we can't change MFP_TCDR reload value (200)
96	 * because awaitkey_1sec() in consio.c assumes that value.
97	 */
98
99	/* handle >5ms delays first */
100	for (; us > 5000; us -= 5000) {
101		MFP_TIMERC = 200;
102		while (MFP_TIMERC >= 100)
103			continue;
104	}
105
106	/* count rest fractions */
107	end = 200 - (us / 50);
108	MFP_TIMERC = 200;
109	while (MFP_TIMERC >= end)
110		continue;
111}
112