181 lines
4.6 KiB
C
181 lines
4.6 KiB
C
/*
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* (C) Copyright 2001, 2002, 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* Keith Outwater, keith_outwater@mvis.com`
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* Steven Scholz, steven.scholz@imc-berlin.de
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Date & Time support (no alarms) for Dallas Semiconductor (now Maxim)
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* DS1307 and DS1338/9 Real Time Clock (RTC).
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*
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* based on ds1337.c
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*/
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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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/*---------------------------------------------------------------------*/
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#undef DEBUG_RTC
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#ifdef DEBUG_RTC
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#define DEBUGR(fmt,args...) printf(fmt ,##args)
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#else
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#define DEBUGR(fmt,args...)
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#endif
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/*---------------------------------------------------------------------*/
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#ifndef CONFIG_SYS_I2C_RTC_ADDR
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# define CONFIG_SYS_I2C_RTC_ADDR 0x68
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#endif
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#if defined(CONFIG_RTC_DS1307) && (CONFIG_SYS_I2C_SPEED > 100000)
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# error The DS1307 is specified only up to 100kHz!
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#endif
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/*
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* RTC register addresses
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*/
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#define RTC_SEC_REG_ADDR 0x00
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#define RTC_MIN_REG_ADDR 0x01
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#define RTC_HR_REG_ADDR 0x02
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#define RTC_DAY_REG_ADDR 0x03
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#define RTC_DATE_REG_ADDR 0x04
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#define RTC_MON_REG_ADDR 0x05
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#define RTC_YR_REG_ADDR 0x06
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#define RTC_CTL_REG_ADDR 0x07
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#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */
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#define RTC_CTL_BIT_RS0 0x01 /* Rate select 0 */
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#define RTC_CTL_BIT_RS1 0x02 /* Rate select 1 */
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#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */
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#define RTC_CTL_BIT_OUT 0x80 /* Output Control */
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static uchar rtc_read (uchar reg);
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static void rtc_write (uchar reg, uchar val);
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/*
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* Get the current time from the RTC
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*/
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int rtc_get (struct rtc_time *tmp)
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{
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int rel = 0;
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uchar sec, min, hour, mday, wday, mon, year;
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sec = rtc_read (RTC_SEC_REG_ADDR);
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min = rtc_read (RTC_MIN_REG_ADDR);
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hour = rtc_read (RTC_HR_REG_ADDR);
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wday = rtc_read (RTC_DAY_REG_ADDR);
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mday = rtc_read (RTC_DATE_REG_ADDR);
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mon = rtc_read (RTC_MON_REG_ADDR);
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year = rtc_read (RTC_YR_REG_ADDR);
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DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, mon, mday, wday, hour, min, sec);
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if (sec & RTC_SEC_BIT_CH) {
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printf ("### Warning: RTC oscillator has stopped\n");
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/* clear the CH flag */
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rtc_write (RTC_SEC_REG_ADDR,
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rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH);
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rel = -1;
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}
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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 (year) >= 70 ? 1900 : 2000);
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tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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DEBUGR ("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 rel;
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}
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/*
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* Set the RTC
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*/
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int rtc_set (struct rtc_time *tmp)
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{
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DEBUGR ("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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if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
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printf("WARNING: year should be between 1970 and 2069!\n");
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rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
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rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
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rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
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rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
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rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
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rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
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rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
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return 0;
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}
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/*
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* Reset the RTC. We setting the date back to 1970-01-01.
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* We also enable the oscillator output on the SQW/OUT pin and program
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* it for 32,768 Hz output. Note that according to the datasheet, turning
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* on the square wave output increases the current drain on the backup
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* battery to something between 480nA and 800nA.
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*/
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void rtc_reset (void)
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{
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struct rtc_time tmp;
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rtc_write (RTC_SEC_REG_ADDR, 0x00); /* clearing Clock Halt */
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rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS0);
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tmp.tm_year = 1970;
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tmp.tm_mon = 1;
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tmp.tm_mday= 1;
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tmp.tm_hour = 0;
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tmp.tm_min = 0;
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tmp.tm_sec = 0;
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rtc_set(&tmp);
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printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
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tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
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tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
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return;
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}
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/*
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* Helper functions
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*/
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static
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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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}
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#endif
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