/* * (C) Copyright 2001 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* * Date & Time support for Philips PCF8563 RTC */ /* #define DEBUG */ #include <common.h> #include <command.h> #include <rtc.h> #include <i2c.h> #if defined(CONFIG_CMD_DATE) static uchar rtc_read (uchar reg); static void rtc_write (uchar reg, uchar val); static uchar bin2bcd (unsigned int n); static unsigned bcd2bin(uchar c); /* ------------------------------------------------------------------------- */ int rtc_get (struct rtc_time *tmp) { int rel = 0; uchar sec, min, hour, mday, wday, mon_cent, year; sec = rtc_read (0x02); min = rtc_read (0x03); hour = rtc_read (0x04); mday = rtc_read (0x05); wday = rtc_read (0x06); mon_cent= rtc_read (0x07); year = rtc_read (0x08); debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " "hr: %02x min: %02x sec: %02x\n", year, mon_cent, mday, wday, hour, min, sec ); debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n", rtc_read (0x0C), rtc_read (0x0B), rtc_read (0x0A), rtc_read (0x09) ); if (sec & 0x80) { puts ("### Warning: RTC Low Voltage - date/time not reliable\n"); rel = -1; } tmp->tm_sec = bcd2bin (sec & 0x7F); tmp->tm_min = bcd2bin (min & 0x7F); tmp->tm_hour = bcd2bin (hour & 0x3F); tmp->tm_mday = bcd2bin (mday & 0x3F); tmp->tm_mon = bcd2bin (mon_cent & 0x1F); tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900); tmp->tm_wday = bcd2bin (wday & 0x07); tmp->tm_yday = 0; tmp->tm_isdst= 0; debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); return rel; } int rtc_set (struct rtc_time *tmp) { uchar century; debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); rtc_write (0x08, bin2bcd(tmp->tm_year % 100)); century = (tmp->tm_year >= 2000) ? 0x80 : 0; rtc_write (0x07, bin2bcd(tmp->tm_mon) | century); rtc_write (0x06, bin2bcd(tmp->tm_wday)); rtc_write (0x05, bin2bcd(tmp->tm_mday)); rtc_write (0x04, bin2bcd(tmp->tm_hour)); rtc_write (0x03, bin2bcd(tmp->tm_min )); rtc_write (0x02, bin2bcd(tmp->tm_sec )); return 0; } void rtc_reset (void) { /* clear all control & status registers */ rtc_write (0x00, 0x00); rtc_write (0x01, 0x00); rtc_write (0x0D, 0x00); /* clear Voltage Low bit */ rtc_write (0x02, rtc_read (0x02) & 0x7F); /* reset all alarms */ rtc_write (0x09, 0x00); rtc_write (0x0A, 0x00); rtc_write (0x0B, 0x00); rtc_write (0x0C, 0x00); } /* ------------------------------------------------------------------------- */ static uchar rtc_read (uchar reg) { return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); } static void rtc_write (uchar reg, uchar val) { i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); } static unsigned bcd2bin (uchar n) { return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); } static unsigned char bin2bcd (unsigned int n) { return (((n / 10) << 4) | (n % 10)); } #endif