mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-26 22:52:18 +00:00
885fc78c28
Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com> Acked-by: Stefan Roese <sr@denx.de>
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
|
|
* (C) Copyright 2004
|
|
* 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 MAXIM MAX6900 RTC
|
|
*/
|
|
|
|
/* #define DEBUG */
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <rtc.h>
|
|
#include <i2c.h>
|
|
|
|
#if defined(CONFIG_CMD_DATE)
|
|
|
|
#ifndef CONFIG_SYS_I2C_RTC_ADDR
|
|
#define CONFIG_SYS_I2C_RTC_ADDR 0x50
|
|
#endif
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
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);
|
|
udelay(2500);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
int rtc_get (struct rtc_time *tmp)
|
|
{
|
|
uchar sec, min, hour, mday, wday, mon, cent, year;
|
|
int retry = 1;
|
|
|
|
do {
|
|
sec = rtc_read (0x80);
|
|
min = rtc_read (0x82);
|
|
hour = rtc_read (0x84);
|
|
mday = rtc_read (0x86);
|
|
mon = rtc_read (0x88);
|
|
wday = rtc_read (0x8a);
|
|
year = rtc_read (0x8c);
|
|
cent = rtc_read (0x92);
|
|
/*
|
|
* Check for seconds rollover
|
|
*/
|
|
if ((sec != 59) || (rtc_read(0x80) == sec)){
|
|
retry = 0;
|
|
}
|
|
} while (retry);
|
|
|
|
debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x "
|
|
"hr: %02x min: %02x sec: %02x\n",
|
|
year, mon, cent, mday, wday,
|
|
hour, min, sec );
|
|
|
|
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(cent) * 100;
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rtc_set (struct rtc_time *tmp)
|
|
{
|
|
|
|
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 (0x9E, 0x00);
|
|
rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */
|
|
rtc_write (0x92, bin2bcd(tmp->tm_year / 100));
|
|
rtc_write (0x8c, bin2bcd(tmp->tm_year % 100));
|
|
rtc_write (0x8a, bin2bcd(tmp->tm_wday));
|
|
rtc_write (0x88, bin2bcd(tmp->tm_mon));
|
|
rtc_write (0x86, bin2bcd(tmp->tm_mday));
|
|
rtc_write (0x84, bin2bcd(tmp->tm_hour));
|
|
rtc_write (0x82, bin2bcd(tmp->tm_min ));
|
|
rtc_write (0x80, bin2bcd(tmp->tm_sec ));
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rtc_reset (void)
|
|
{
|
|
}
|
|
|
|
#endif
|