| /* |
| * (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; |
| } |
| |
| void 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 )); |
| } |
| |
| 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 (CFG_I2C_RTC_ADDR, reg)); |
| } |
| |
| static void rtc_write (uchar reg, uchar val) |
| { |
| i2c_reg_write (CFG_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 |