205 lines
5.6 KiB
C
205 lines
5.6 KiB
C
/*
|
|
* (C) Copyright 2001, 2002, 2003
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
* Keith Outwater, keith_outwater@mvis.com`
|
|
* Steven Scholz, steven.scholz@imc-berlin.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 (no alarms) for Dallas Semiconductor (now Maxim)
|
|
* DS1307 and DS1338 Real Time Clock (RTC).
|
|
*
|
|
* based on ds1337.c
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <rtc.h>
|
|
#include <i2c.h>
|
|
|
|
#if (defined(CONFIG_RTC_DS1307) || defined(CONFIG_RTC_DS1338) ) && \
|
|
defined(CONFIG_CMD_DATE)
|
|
|
|
/*---------------------------------------------------------------------*/
|
|
#undef DEBUG_RTC
|
|
|
|
#ifdef DEBUG_RTC
|
|
#define DEBUGR(fmt,args...) printf(fmt ,##args)
|
|
#else
|
|
#define DEBUGR(fmt,args...)
|
|
#endif
|
|
/*---------------------------------------------------------------------*/
|
|
|
|
#ifndef CFG_I2C_RTC_ADDR
|
|
# define CFG_I2C_RTC_ADDR 0x68
|
|
#endif
|
|
|
|
#if defined(CONFIG_RTC_DS1307) && (CFG_I2C_SPEED > 100000)
|
|
# error The DS1307 is specified only up to 100kHz!
|
|
#endif
|
|
|
|
/*
|
|
* RTC register addresses
|
|
*/
|
|
#define RTC_SEC_REG_ADDR 0x00
|
|
#define RTC_MIN_REG_ADDR 0x01
|
|
#define RTC_HR_REG_ADDR 0x02
|
|
#define RTC_DAY_REG_ADDR 0x03
|
|
#define RTC_DATE_REG_ADDR 0x04
|
|
#define RTC_MON_REG_ADDR 0x05
|
|
#define RTC_YR_REG_ADDR 0x06
|
|
#define RTC_CTL_REG_ADDR 0x07
|
|
|
|
#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */
|
|
|
|
#define RTC_CTL_BIT_RS0 0x01 /* Rate select 0 */
|
|
#define RTC_CTL_BIT_RS1 0x02 /* Rate select 1 */
|
|
#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */
|
|
#define RTC_CTL_BIT_OUT 0x80 /* Output Control */
|
|
|
|
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);
|
|
|
|
/*
|
|
* Get the current time from the RTC
|
|
*/
|
|
void rtc_get (struct rtc_time *tmp)
|
|
{
|
|
uchar sec, min, hour, mday, wday, mon, year;
|
|
|
|
sec = rtc_read (RTC_SEC_REG_ADDR);
|
|
min = rtc_read (RTC_MIN_REG_ADDR);
|
|
hour = rtc_read (RTC_HR_REG_ADDR);
|
|
wday = rtc_read (RTC_DAY_REG_ADDR);
|
|
mday = rtc_read (RTC_DATE_REG_ADDR);
|
|
mon = rtc_read (RTC_MON_REG_ADDR);
|
|
year = rtc_read (RTC_YR_REG_ADDR);
|
|
|
|
DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
|
|
"hr: %02x min: %02x sec: %02x\n",
|
|
year, mon, mday, wday, hour, min, sec);
|
|
|
|
if (sec & RTC_SEC_BIT_CH) {
|
|
printf ("### Warning: RTC oscillator has stopped\n");
|
|
/* clear the CH flag */
|
|
rtc_write (RTC_SEC_REG_ADDR,
|
|
rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH);
|
|
}
|
|
|
|
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 & 0x1F);
|
|
tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
|
|
tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
|
|
tmp->tm_yday = 0;
|
|
tmp->tm_isdst= 0;
|
|
|
|
DEBUGR ("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);
|
|
}
|
|
|
|
|
|
/*
|
|
* Set the RTC
|
|
*/
|
|
void rtc_set (struct rtc_time *tmp)
|
|
{
|
|
DEBUGR ("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);
|
|
|
|
if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
|
|
printf("WARNING: year should be between 1970 and 2069!\n");
|
|
|
|
rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
|
|
rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
|
|
rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
|
|
rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
|
|
rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
|
|
rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
|
|
rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
|
|
}
|
|
|
|
|
|
/*
|
|
* Reset the RTC. We setting the date back to 1970-01-01.
|
|
* We also enable the oscillator output on the SQW/OUT pin and program
|
|
* it for 32,768 Hz output. Note that according to the datasheet, turning
|
|
* on the square wave output increases the current drain on the backup
|
|
* battery to something between 480nA and 800nA.
|
|
*/
|
|
void rtc_reset (void)
|
|
{
|
|
struct rtc_time tmp;
|
|
|
|
rtc_write (RTC_SEC_REG_ADDR, 0x00); /* clearing Clock Halt */
|
|
rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_SQWE | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS0);
|
|
|
|
tmp.tm_year = 1970;
|
|
tmp.tm_mon = 1;
|
|
tmp.tm_mday= 1;
|
|
tmp.tm_hour = 0;
|
|
tmp.tm_min = 0;
|
|
tmp.tm_sec = 0;
|
|
|
|
rtc_set(&tmp);
|
|
|
|
printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
|
|
tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
|
|
tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Helper functions
|
|
*/
|
|
|
|
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
|