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wdenkfe8c2802002-11-03 00:38:21 +00001/*
2 * (C) Copyright 2001
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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 Philips PCF8563 RTC
26 */
27
28/* #define DEBUG */
29
30#include <common.h>
31#include <command.h>
32#include <rtc.h>
33#include <i2c.h>
34
35#if defined(CONFIG_RTC_PCF8563) && (CONFIG_COMMANDS & CFG_CMD_DATE)
36
37static uchar rtc_read (uchar reg);
38static void rtc_write (uchar reg, uchar val);
39static uchar bin2bcd (unsigned int n);
40static unsigned bcd2bin(uchar c);
41
42/* ------------------------------------------------------------------------- */
43
44void rtc_get (struct rtc_time *tmp)
45{
46 uchar sec, min, hour, mday, wday, mon_cent, year;
47
48 sec = rtc_read (0x02);
49 min = rtc_read (0x03);
50 hour = rtc_read (0x04);
51 mday = rtc_read (0x05);
52 wday = rtc_read (0x06);
53 mon_cent= rtc_read (0x07);
54 year = rtc_read (0x08);
55
56 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
57 "hr: %02x min: %02x sec: %02x\n",
58 year, mon_cent, mday, wday,
59 hour, min, sec );
60 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
61 rtc_read (0x0C),
62 rtc_read (0x0B),
63 rtc_read (0x0A),
64 rtc_read (0x09) );
65
66 if (sec & 0x80) {
67 printf ("### Warning: RTC Low Voltage - date/time not reliable\n");
68 }
69
70 tmp->tm_sec = bcd2bin (sec & 0x7F);
71 tmp->tm_min = bcd2bin (min & 0x7F);
72 tmp->tm_hour = bcd2bin (hour & 0x3F);
73 tmp->tm_mday = bcd2bin (mday & 0x3F);
74 tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
75 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
76 tmp->tm_wday = bcd2bin (wday & 0x07);
77 tmp->tm_yday = 0;
78 tmp->tm_isdst= 0;
79
80 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
81 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
82 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
83}
84
85void rtc_set (struct rtc_time *tmp)
86{
87 uchar century;
88
89 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
90 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
91 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
92
93 rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
94
95 century = (tmp->tm_year >= 2000) ? 0x80 : 0;
96 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
97
98 rtc_write (0x06, bin2bcd(tmp->tm_wday));
99 rtc_write (0x05, bin2bcd(tmp->tm_mday));
100 rtc_write (0x04, bin2bcd(tmp->tm_hour));
101 rtc_write (0x03, bin2bcd(tmp->tm_min ));
102 rtc_write (0x02, bin2bcd(tmp->tm_sec ));
103}
104
105void rtc_reset (void)
106{
107 /* clear all control & status registers */
108 rtc_write (0x00, 0x00);
109 rtc_write (0x01, 0x00);
110 rtc_write (0x0D, 0x00);
111
112 /* clear Voltage Low bit */
113 rtc_write (0x02, rtc_read (0x02) & 0x7F);
114
115 /* reset all alarms */
116 rtc_write (0x09, 0x00);
117 rtc_write (0x0A, 0x00);
118 rtc_write (0x0B, 0x00);
119 rtc_write (0x0C, 0x00);
120}
121
122/* ------------------------------------------------------------------------- */
123
124static uchar rtc_read (uchar reg)
125{
126 return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
127}
128
129static void rtc_write (uchar reg, uchar val)
130{
131 i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val);
132}
133
134static unsigned bcd2bin (uchar n)
135{
136 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
137}
138
139static unsigned char bin2bcd (unsigned int n)
140{
141 return (((n / 10) << 4) | (n % 10));
142}
143
144#endif /* CONFIG_RTC_PCF8563 && CFG_CMD_DATE */