3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
25 * Date & Time support for Philips PCF8563 RTC
35 #if defined(CONFIG_CMD_DATE)
37 static uchar rtc_read (uchar reg);
38 static void rtc_write (uchar reg, uchar val);
39 static uchar bin2bcd (unsigned int n);
40 static unsigned bcd2bin(uchar c);
42 /* ------------------------------------------------------------------------- */
44 int rtc_get (struct rtc_time *tmp)
47 uchar sec, min, hour, mday, wday, mon_cent, year;
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);
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,
61 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
68 puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
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);
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);
89 int rtc_set (struct rtc_time *tmp)
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);
97 rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
99 century = (tmp->tm_year >= 2000) ? 0x80 : 0;
100 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
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 ));
111 void rtc_reset (void)
113 /* clear all control & status registers */
114 rtc_write (0x00, 0x00);
115 rtc_write (0x01, 0x00);
116 rtc_write (0x0D, 0x00);
118 /* clear Voltage Low bit */
119 rtc_write (0x02, rtc_read (0x02) & 0x7F);
121 /* reset all alarms */
122 rtc_write (0x09, 0x00);
123 rtc_write (0x0A, 0x00);
124 rtc_write (0x0B, 0x00);
125 rtc_write (0x0C, 0x00);
128 /* ------------------------------------------------------------------------- */
130 static uchar rtc_read (uchar reg)
132 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
135 static void rtc_write (uchar reg, uchar val)
137 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
140 static unsigned bcd2bin (uchar n)
142 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
145 static unsigned char bin2bcd (unsigned int n)
147 return (((n / 10) << 4) | (n % 10));