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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
Michal Simek871c18d2008-07-14 19:45:37 +020035#if defined(CONFIG_CMD_DATE)
wdenkfe8c2802002-11-03 00:38:21 +000036
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
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030044int rtc_get (struct rtc_time *tmp)
wdenkfe8c2802002-11-03 00:38:21 +000045{
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030046 int rel = 0;
wdenkfe8c2802002-11-03 00:38:21 +000047 uchar sec, min, hour, mday, wday, mon_cent, year;
48
49 sec = rtc_read (0x02);
50 min = rtc_read (0x03);
51 hour = rtc_read (0x04);
52 mday = rtc_read (0x05);
53 wday = rtc_read (0x06);
54 mon_cent= rtc_read (0x07);
55 year = rtc_read (0x08);
56
57 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
58 "hr: %02x min: %02x sec: %02x\n",
59 year, mon_cent, mday, wday,
60 hour, min, sec );
61 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
62 rtc_read (0x0C),
63 rtc_read (0x0B),
64 rtc_read (0x0A),
65 rtc_read (0x09) );
66
67 if (sec & 0x80) {
wdenk4b9206e2004-03-23 22:14:11 +000068 puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030069 rel = -1;
wdenkfe8c2802002-11-03 00:38:21 +000070 }
71
72 tmp->tm_sec = bcd2bin (sec & 0x7F);
73 tmp->tm_min = bcd2bin (min & 0x7F);
74 tmp->tm_hour = bcd2bin (hour & 0x3F);
75 tmp->tm_mday = bcd2bin (mday & 0x3F);
76 tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
77 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
78 tmp->tm_wday = bcd2bin (wday & 0x07);
79 tmp->tm_yday = 0;
80 tmp->tm_isdst= 0;
81
82 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
83 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
84 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030085
86 return rel;
wdenkfe8c2802002-11-03 00:38:21 +000087}
88
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +020089int rtc_set (struct rtc_time *tmp)
wdenkfe8c2802002-11-03 00:38:21 +000090{
91 uchar century;
92
93 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
94 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
95 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
96
97 rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
98
99 century = (tmp->tm_year >= 2000) ? 0x80 : 0;
100 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
101
102 rtc_write (0x06, bin2bcd(tmp->tm_wday));
103 rtc_write (0x05, bin2bcd(tmp->tm_mday));
104 rtc_write (0x04, bin2bcd(tmp->tm_hour));
105 rtc_write (0x03, bin2bcd(tmp->tm_min ));
106 rtc_write (0x02, bin2bcd(tmp->tm_sec ));
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200107
108 return 0;
wdenkfe8c2802002-11-03 00:38:21 +0000109}
110
111void rtc_reset (void)
112{
113 /* clear all control & status registers */
114 rtc_write (0x00, 0x00);
115 rtc_write (0x01, 0x00);
116 rtc_write (0x0D, 0x00);
117
118 /* clear Voltage Low bit */
119 rtc_write (0x02, rtc_read (0x02) & 0x7F);
120
121 /* reset all alarms */
122 rtc_write (0x09, 0x00);
123 rtc_write (0x0A, 0x00);
124 rtc_write (0x0B, 0x00);
125 rtc_write (0x0C, 0x00);
126}
127
128/* ------------------------------------------------------------------------- */
129
130static uchar rtc_read (uchar reg)
131{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200132 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
wdenkfe8c2802002-11-03 00:38:21 +0000133}
134
135static void rtc_write (uchar reg, uchar val)
136{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200137 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
wdenkfe8c2802002-11-03 00:38:21 +0000138}
139
140static unsigned bcd2bin (uchar n)
141{
142 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
143}
144
145static unsigned char bin2bcd (unsigned int n)
146{
147 return (((n / 10) << 4) | (n % 10));
148}
149
Jon Loeliger068b60a2007-07-10 10:27:39 -0500150#endif