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wdenkaffae2b2002-08-17 09:36:01 +00001/*
2 * (C) Copyright 2001
3 * Denis Peter MPL AG Switzerland. d.peter@mpl.ch
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * Date & Time support for the MC146818 (PIXX4) RTC
26 */
27
28/*#define DEBUG*/
29
30#include <common.h>
31#include <command.h>
32#include <rtc.h>
33
34#if defined(CONFIG_RTC_MC146818) && (CONFIG_COMMANDS & CFG_CMD_DATE)
35
36static uchar rtc_read (uchar reg);
37static void rtc_write (uchar reg, uchar val);
38static uchar bin2bcd (unsigned int n);
39static unsigned bcd2bin(uchar c);
40
41#define RTC_PORT_MC146818 CFG_ISA_IO_BASE_ADDRESS + 0x70
42#define RTC_SECONDS 0x00
43#define RTC_SECONDS_ALARM 0x01
44#define RTC_MINUTES 0x02
45#define RTC_MINUTES_ALARM 0x03
46#define RTC_HOURS 0x04
47#define RTC_HOURS_ALARM 0x05
48#define RTC_DAY_OF_WEEK 0x06
49#define RTC_DATE_OF_MONTH 0x07
50#define RTC_MONTH 0x08
51#define RTC_YEAR 0x09
52#define RTC_CONFIG_A 0x0A
53#define RTC_CONFIG_B 0x0B
54#define RTC_CONFIG_C 0x0C
55#define RTC_CONFIG_D 0x0D
56
57
58/* ------------------------------------------------------------------------- */
59
60void rtc_get (struct rtc_time *tmp)
61{
62 uchar sec, min, hour, mday, wday, mon, year;
63 /* here check if rtc can be accessed */
64 while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
65 sec = rtc_read (RTC_SECONDS);
66 min = rtc_read (RTC_MINUTES);
67 hour = rtc_read (RTC_HOURS);
68 mday = rtc_read (RTC_DATE_OF_MONTH);
69 wday = rtc_read (RTC_DAY_OF_WEEK);
70 mon = rtc_read (RTC_MONTH);
71 year = rtc_read (RTC_YEAR);
wdenkc7de8292002-11-19 11:04:11 +000072#ifdef CONFIG_AMIGAONEG3SE
73 wday -= 1; /* VIA 686 stores Sunday = 1, Monday = 2, ... */
74#endif
wdenkaffae2b2002-08-17 09:36:01 +000075#ifdef RTC_DEBUG
76 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
77 "hr: %02x min: %02x sec: %02x\n",
wdenkc7de8292002-11-19 11:04:11 +000078 year, mon, mday, wday,
wdenkaffae2b2002-08-17 09:36:01 +000079 hour, min, sec );
80 printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
81 rtc_read (RTC_CONFIG_D) & 0x3F,
82 rtc_read (RTC_HOURS_ALARM),
83 rtc_read (RTC_MINUTES_ALARM),
84 rtc_read (RTC_SECONDS_ALARM) );
85#endif
86 tmp->tm_sec = bcd2bin (sec & 0x7F);
87 tmp->tm_min = bcd2bin (min & 0x7F);
88 tmp->tm_hour = bcd2bin (hour & 0x3F);
89 tmp->tm_mday = bcd2bin (mday & 0x3F);
90 tmp->tm_mon = bcd2bin (mon & 0x1F);
91 tmp->tm_year = bcd2bin (year);
92 tmp->tm_wday = bcd2bin (wday & 0x07);
93 if(tmp->tm_year<70)
94 tmp->tm_year+=2000;
95 else
96 tmp->tm_year+=1900;
97 tmp->tm_yday = 0;
98 tmp->tm_isdst= 0;
99#ifdef RTC_DEBUG
100 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
101 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
102 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
103#endif
104}
105
106void rtc_set (struct rtc_time *tmp)
107{
108#ifdef RTC_DEBUG
109 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
110 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
111 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
112#endif
113 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
114
115 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
116 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
wdenkc7de8292002-11-19 11:04:11 +0000117#ifdef CONFIG_AMIGAONEG3SE
118 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)+1);
119#else
wdenkaffae2b2002-08-17 09:36:01 +0000120 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
wdenkc7de8292002-11-19 11:04:11 +0000121#endif
wdenkaffae2b2002-08-17 09:36:01 +0000122 rtc_write (RTC_DATE_OF_MONTH, bin2bcd(tmp->tm_mday));
123 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
124 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
125 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
126 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
127
128}
129
130void rtc_reset (void)
131{
132 rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
133 rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
134 rtc_write(RTC_CONFIG_B,0x00);
135 rtc_write(RTC_CONFIG_B,0x00);
136 rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
137}
138
139/* ------------------------------------------------------------------------- */
140
141#ifdef CFG_RTC_REG_BASE_ADDR
142/*
143 * use direct memory access
144 */
145static uchar rtc_read (uchar reg)
146{
147 return(in8(CFG_RTC_REG_BASE_ADDR+reg));
148}
149
150static void rtc_write (uchar reg, uchar val)
151{
152 out8(CFG_RTC_REG_BASE_ADDR+reg, val);
153}
154#else
155static uchar rtc_read (uchar reg)
156{
157 out8(RTC_PORT_MC146818,reg);
158 return(in8(RTC_PORT_MC146818+1));
159}
160
161static void rtc_write (uchar reg, uchar val)
162{
163 out8(RTC_PORT_MC146818,reg);
164 out8(RTC_PORT_MC146818+1,val);
165}
166#endif
167
168static unsigned bcd2bin (uchar n)
169{
170 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
171}
172
173static unsigned char bin2bcd (unsigned int n)
174{
175 return (((n / 10) << 4) | (n % 10));
176}
177
178#endif /* CONFIG_RTC_MC146818 && CFG_CMD_DATE */