mpc5xxx.c
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/*
* (C) Copyright 2004
* Reinhard Meyer, EMK Elektronik GmbH
* r.meyer@emk-elektronik.de
* www.emk-elektronik.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 internal RTC of MPC52xx
*****************************************************************************/
/*#define DEBUG*/
#include <common.h>
#include <command.h>
#include <rtc.h>
#if defined(CONFIG_CMD_DATE)
/*****************************************************************************
* this structure should be defined in mpc5200.h ...
*****************************************************************************/
typedef struct rtc5200 {
volatile ulong tsr; /* MBAR+0x800: time set register */
volatile ulong dsr; /* MBAR+0x804: data set register */
volatile ulong nysr; /* MBAR+0x808: new year and stopwatch register */
volatile ulong aier; /* MBAR+0x80C: alarm and interrupt enable register */
volatile ulong ctr; /* MBAR+0x810: current time register */
volatile ulong cdr; /* MBAR+0x814: current data register */
volatile ulong asir; /* MBAR+0x818: alarm and stopwatch interrupt register */
volatile ulong piber; /* MBAR+0x81C: periodic interrupt and bus error register */
volatile ulong trdr; /* MBAR+0x820: test register/divides register */
} RTC5200;
#define RTC_SET 0x02000000
#define RTC_PAUSE 0x01000000
/*****************************************************************************
* get time
*****************************************************************************/
int rtc_get (struct rtc_time *tmp)
{
RTC5200 *rtc = (RTC5200 *) (CONFIG_SYS_MBAR+0x800);
ulong time, date, time2;
/* read twice to avoid getting a funny time when the second is just changing */
do {
time = rtc->ctr;
date = rtc->cdr;
time2 = rtc->ctr;
} while (time != time2);
tmp->tm_year = date & 0xfff;
tmp->tm_mon = (date >> 24) & 0xf;
tmp->tm_mday = (date >> 16) & 0x1f;
tmp->tm_wday = (date >> 21) & 7;
/* sunday is 7 in 5200 but 0 in rtc_time */
if (tmp->tm_wday == 7)
tmp->tm_wday = 0;
tmp->tm_hour = (time >> 16) & 0x1f;
tmp->tm_min = (time >> 8) & 0x3f;
tmp->tm_sec = time & 0x3f;
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;
}
/*****************************************************************************
* set time
*****************************************************************************/
int rtc_set (struct rtc_time *tmp)
{
RTC5200 *rtc = (RTC5200 *) (CONFIG_SYS_MBAR+0x800);
ulong time, date, year;
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);
time = (tmp->tm_hour << 16) | (tmp->tm_min << 8) | tmp->tm_sec;
date = (tmp->tm_mon << 16) | tmp->tm_mday;
if (tmp->tm_wday == 0)
date |= (7 << 8);
else
date |= (tmp->tm_wday << 8);
year = tmp->tm_year;
/* mask unwanted bits that might show up when rtc_time is corrupt */
time &= 0x001f3f3f;
date &= 0x001f071f;
year &= 0x00000fff;
/* pause and set the RTC */
rtc->nysr = year;
rtc->dsr = date | RTC_PAUSE;
udelay (1000);
rtc->dsr = date | RTC_PAUSE | RTC_SET;
udelay (1000);
rtc->dsr = date | RTC_PAUSE;
udelay (1000);
rtc->dsr = date;
udelay (1000);
rtc->tsr = time | RTC_PAUSE;
udelay (1000);
rtc->tsr = time | RTC_PAUSE | RTC_SET;
udelay (1000);
rtc->tsr = time | RTC_PAUSE;
udelay (1000);
rtc->tsr = time;
udelay (1000);
return 0;
}
/*****************************************************************************
* reset rtc circuit
*****************************************************************************/
void rtc_reset (void)
{
return; /* nothing to do */
}
#endif