mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-23 18:38:51 +09:00
167 lines
4.2 KiB
C
167 lines
4.2 KiB
C
/*
|
|
* (C) Copyright 2001
|
|
* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
|
|
*
|
|
* 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 ST Electronics M48T35Ax RTC
|
|
*/
|
|
|
|
/*#define DEBUG */
|
|
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <rtc.h>
|
|
#include <config.h>
|
|
|
|
#if defined(CONFIG_RTC_M48T35A) && (CONFIG_COMMANDS & CFG_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, cent_day, date, month, year;
|
|
uchar ccr; /* Clock control register */
|
|
|
|
/* Lock RTC for read using clock control register */
|
|
ccr = rtc_read(0);
|
|
ccr = ccr | 0x40;
|
|
rtc_write(0, ccr);
|
|
|
|
sec = rtc_read (0x1);
|
|
min = rtc_read (0x2);
|
|
hour = rtc_read (0x3);
|
|
cent_day= rtc_read (0x4);
|
|
date = rtc_read (0x5);
|
|
month = rtc_read (0x6);
|
|
year = rtc_read (0x7);
|
|
|
|
/* UNLock RTC */
|
|
ccr = rtc_read(0);
|
|
ccr = ccr & 0xBF;
|
|
rtc_write(0, ccr);
|
|
|
|
debug ( "Get RTC year: %02x month: %02x date: %02x cent_day: %02x "
|
|
"hr: %02x min: %02x sec: %02x\n",
|
|
year, month, date, cent_day,
|
|
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 (date & 0x3F);
|
|
tmp->tm_mon = bcd2bin (month & 0x1F);
|
|
tmp->tm_year = bcd2bin (year) + ((cent_day & 0x10) ? 2000 : 1900);
|
|
tmp->tm_wday = bcd2bin (cent_day & 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 ccr; /* Clock control register */
|
|
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);
|
|
|
|
/* Lock RTC for write using clock control register */
|
|
ccr = rtc_read(0);
|
|
ccr = ccr | 0x80;
|
|
rtc_write(0, ccr);
|
|
|
|
rtc_write (0x07, bin2bcd(tmp->tm_year % 100));
|
|
rtc_write (0x06, bin2bcd(tmp->tm_mon));
|
|
rtc_write (0x05, bin2bcd(tmp->tm_mday));
|
|
|
|
century = ((tmp->tm_year >= 2000) ? 0x10 : 0) | 0x20;
|
|
rtc_write (0x04, bin2bcd(tmp->tm_wday) | century);
|
|
|
|
rtc_write (0x03, bin2bcd(tmp->tm_hour));
|
|
rtc_write (0x02, bin2bcd(tmp->tm_min ));
|
|
rtc_write (0x01, bin2bcd(tmp->tm_sec ));
|
|
|
|
/* UNLock RTC */
|
|
ccr = rtc_read(0);
|
|
ccr = ccr & 0x7F;
|
|
rtc_write(0, ccr);
|
|
}
|
|
|
|
void rtc_reset (void)
|
|
{
|
|
uchar val;
|
|
|
|
/* Clear all clock control registers */
|
|
rtc_write (0x0, 0x80); /* No Read Lock or calibration */
|
|
|
|
/* Clear stop bit */
|
|
val = rtc_read (0x1);
|
|
val &= 0x7f;
|
|
rtc_write(0x1, val);
|
|
|
|
/* Enable century / disable frequency test */
|
|
val = rtc_read (0x4);
|
|
val = (val & 0xBF) | 0x20;
|
|
rtc_write(0x4, val);
|
|
|
|
/* Clear write lock */
|
|
rtc_write(0x0, 0);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static uchar rtc_read (uchar reg)
|
|
{
|
|
uchar val;
|
|
val = *(unsigned char *)
|
|
((CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE - 8) + reg);
|
|
return val;
|
|
}
|
|
|
|
static void rtc_write (uchar reg, uchar val)
|
|
{
|
|
*(unsigned char *)
|
|
((CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE - 8) + 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_M48T35A && CFG_CMD_DATE */
|