mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-01 17:10:11 +00:00
144 lines
3.8 KiB
C
144 lines
3.8 KiB
C
/*
|
|
* (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_RTC_PCF8563) && 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);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
void rtc_get (struct rtc_time *tmp)
|
|
{
|
|
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");
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 /* CONFIG_RTC_PCF8563 && CFG_CMD_DATE */
|