173 lines
4.6 KiB
C
173 lines
4.6 KiB
C
/*
|
|
* (C) Copyright 2008
|
|
* Tor Krill, Excito Elektronik i Skåne , tor@excito.com
|
|
*
|
|
* Modelled after the ds1337 driver
|
|
*
|
|
* 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 Intersil
|
|
* ISL1208 Real Time Clock (RTC).
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <rtc.h>
|
|
#include <i2c.h>
|
|
|
|
/*---------------------------------------------------------------------*/
|
|
#ifdef DEBUG_RTC
|
|
#define DEBUGR(fmt,args...) printf(fmt ,##args)
|
|
#else
|
|
#define DEBUGR(fmt,args...)
|
|
#endif
|
|
/*---------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* RTC register addresses
|
|
*/
|
|
|
|
#define RTC_SEC_REG_ADDR 0x0
|
|
#define RTC_MIN_REG_ADDR 0x1
|
|
#define RTC_HR_REG_ADDR 0x2
|
|
#define RTC_DATE_REG_ADDR 0x3
|
|
#define RTC_MON_REG_ADDR 0x4
|
|
#define RTC_YR_REG_ADDR 0x5
|
|
#define RTC_DAY_REG_ADDR 0x6
|
|
#define RTC_STAT_REG_ADDR 0x7
|
|
/*
|
|
* RTC control register bits
|
|
*/
|
|
|
|
/*
|
|
* RTC status register bits
|
|
*/
|
|
#define RTC_STAT_BIT_ARST 0x80 /* AUTO RESET ENABLE BIT */
|
|
#define RTC_STAT_BIT_XTOSCB 0x40 /* CRYSTAL OSCILLATOR ENABLE BIT */
|
|
#define RTC_STAT_BIT_WRTC 0x10 /* WRITE RTC ENABLE BIT */
|
|
#define RTC_STAT_BIT_ALM 0x04 /* ALARM BIT */
|
|
#define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */
|
|
#define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */
|
|
|
|
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
|
|
*/
|
|
|
|
int rtc_get (struct rtc_time *tmp)
|
|
{
|
|
int rel = 0;
|
|
uchar sec, min, hour, mday, wday, mon, year, status;
|
|
|
|
status = rtc_read (RTC_STAT_REG_ADDR);
|
|
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 status: %02x\n",
|
|
year, mon, mday, wday, hour, min, sec, status);
|
|
|
|
if (status & RTC_STAT_BIT_RTCF) {
|
|
printf ("### Warning: RTC oscillator has stopped\n");
|
|
rtc_write(RTC_STAT_REG_ADDR,
|
|
rtc_read(RTC_STAT_REG_ADDR) &~ (RTC_STAT_BIT_BAT|RTC_STAT_BIT_RTCF));
|
|
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 & 0x1F);
|
|
tmp->tm_year = bcd2bin (year)+2000;
|
|
tmp->tm_wday = bcd2bin (wday & 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);
|
|
|
|
return rel;
|
|
}
|
|
|
|
/*
|
|
* Set the RTC
|
|
*/
|
|
int 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);
|
|
|
|
/* enable write */
|
|
rtc_write(RTC_STAT_REG_ADDR,
|
|
rtc_read(RTC_STAT_REG_ADDR) | RTC_STAT_BIT_WRTC);
|
|
|
|
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));
|
|
rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
|
|
rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour) | 0x80 ); /* 24h clock */
|
|
rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
|
|
rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
|
|
|
|
/* disable write */
|
|
rtc_write(RTC_STAT_REG_ADDR,
|
|
rtc_read(RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_WRTC);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rtc_reset (void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Helper functions
|
|
*/
|
|
|
|
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));
|
|
}
|