136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/*
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* (C) Copyright 2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Date & Time support for MAXIM MAX6900 RTC
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*/
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/* #define DEBUG */
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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#include <i2c.h>
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#if defined(CONFIG_CMD_DATE)
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#ifndef CONFIG_SYS_I2C_RTC_ADDR
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#define CONFIG_SYS_I2C_RTC_ADDR 0x50
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#endif
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/* ------------------------------------------------------------------------- */
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static uchar rtc_read (uchar reg)
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{
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return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
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}
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static void rtc_write (uchar reg, uchar val)
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{
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i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
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udelay(2500);
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}
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static unsigned bcd2bin (uchar n)
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{
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return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
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}
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static unsigned char bin2bcd (unsigned int n)
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{
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return (((n / 10) << 4) | (n % 10));
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}
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/* ------------------------------------------------------------------------- */
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int rtc_get (struct rtc_time *tmp)
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{
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uchar sec, min, hour, mday, wday, mon, cent, year;
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int retry = 1;
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do {
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sec = rtc_read (0x80);
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min = rtc_read (0x82);
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hour = rtc_read (0x84);
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mday = rtc_read (0x86);
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mon = rtc_read (0x88);
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wday = rtc_read (0x8a);
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year = rtc_read (0x8c);
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cent = rtc_read (0x92);
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/*
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* Check for seconds rollover
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*/
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if ((sec != 59) || (rtc_read(0x80) == sec)){
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retry = 0;
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}
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} while (retry);
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debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, mon, cent, mday, wday,
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hour, min, sec );
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tmp->tm_sec = bcd2bin (sec & 0x7F);
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tmp->tm_min = bcd2bin (min & 0x7F);
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tmp->tm_hour = bcd2bin (hour & 0x3F);
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tmp->tm_mday = bcd2bin (mday & 0x3F);
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tmp->tm_mon = bcd2bin (mon & 0x1F);
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tmp->tm_year = bcd2bin (year) + bcd2bin(cent) * 100;
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tmp->tm_wday = bcd2bin (wday & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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return 0;
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}
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int rtc_set (struct rtc_time *tmp)
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{
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debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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rtc_write (0x9E, 0x00);
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rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */
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rtc_write (0x92, bin2bcd(tmp->tm_year / 100));
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rtc_write (0x8c, bin2bcd(tmp->tm_year % 100));
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rtc_write (0x8a, bin2bcd(tmp->tm_wday));
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rtc_write (0x88, bin2bcd(tmp->tm_mon));
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rtc_write (0x86, bin2bcd(tmp->tm_mday));
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rtc_write (0x84, bin2bcd(tmp->tm_hour));
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rtc_write (0x82, bin2bcd(tmp->tm_min ));
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rtc_write (0x80, bin2bcd(tmp->tm_sec ));
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return 0;
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}
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void rtc_reset (void)
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{
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}
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#endif
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