1 /* 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) && defined(CONFIG_CMD_DATE) 36 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); 41 42 /* ------------------------------------------------------------------------- */ 43 44 void 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 puts ("### 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 85 void 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 } 104 105 void 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 /* ------------------------------------------------------------------------- */ 123 124 static uchar rtc_read (uchar reg) 125 { 126 return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg)); 127 } 128 129 static void rtc_write (uchar reg, uchar val) 130 { 131 i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); 132 } 133 134 static unsigned bcd2bin (uchar n) 135 { 136 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); 137 } 138 139 static unsigned char bin2bcd (unsigned int n) 140 { 141 return (((n / 10) << 4) | (n % 10)); 142 } 143 144 #endif 145