mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 18:28:55 +00:00
b73a19e160
Modify the RTC API to provide one a status for the time reported by
the rtc_get() function:
0 - a reliable time is guaranteed,
< 0 - a reliable time isn't guaranteed (power fault, clock issues,
and so on).
The RTC chip drivers are responsible for providing this info if the
corresponding chip supports such functionality. If not - always
report that the time is reliable.
The POST RTC test was modified to detect the RTC faults utilizing
this new rtc_get() feature.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
202 lines
5.4 KiB
C
202 lines
5.4 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* ARIO Data Networks, Inc. dchiu@ariodata.com
|
|
*
|
|
* modified for DS164x:
|
|
* The LEOX team <team@leox.org>, http://www.leox.org
|
|
*
|
|
* Based on MontaVista DS1743 code and U-Boot mc146818 code
|
|
*
|
|
* 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 the DS164x RTC
|
|
*/
|
|
|
|
/* #define RTC_DEBUG */
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <rtc.h>
|
|
|
|
|
|
#if defined(CONFIG_RTC_DS164x) && defined(CONFIG_CMD_DATE)
|
|
|
|
static uchar rtc_read(unsigned int addr );
|
|
static void rtc_write(unsigned int addr, uchar val);
|
|
static uchar bin2bcd(unsigned int n);
|
|
static unsigned bcd2bin(uchar c);
|
|
|
|
#define RTC_EPOCH 2000 /* century */
|
|
|
|
/*
|
|
* DS164x registers layout
|
|
*/
|
|
#define RTC_BASE ( CFG_NVRAM_BASE_ADDR + CFG_NVRAM_SIZE )
|
|
|
|
#define RTC_YEAR ( RTC_BASE + 0x07 )
|
|
#define RTC_MONTH ( RTC_BASE + 0x06 )
|
|
#define RTC_DAY_OF_MONTH ( RTC_BASE + 0x05 )
|
|
#define RTC_DAY_OF_WEEK ( RTC_BASE + 0x04 )
|
|
#define RTC_HOURS ( RTC_BASE + 0x03 )
|
|
#define RTC_MINUTES ( RTC_BASE + 0x02 )
|
|
#define RTC_SECONDS ( RTC_BASE + 0x01 )
|
|
#define RTC_CONTROL ( RTC_BASE + 0x00 )
|
|
|
|
#define RTC_CONTROLA RTC_CONTROL /* W=bit6, R=bit5 */
|
|
#define RTC_CA_WRITE 0x80
|
|
#define RTC_CA_READ 0x40
|
|
#define RTC_CONTROLB RTC_SECONDS /* OSC=bit7 */
|
|
#define RTC_CB_OSC_DISABLE 0x80
|
|
#define RTC_CONTROLC RTC_DAY_OF_WEEK /* FT=bit6 */
|
|
#define RTC_CC_FREQ_TEST 0x40
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
int rtc_get( struct rtc_time *tmp )
|
|
{
|
|
uchar sec, min, hour;
|
|
uchar mday, wday, mon, year;
|
|
|
|
uchar reg_a;
|
|
|
|
reg_a = rtc_read( RTC_CONTROLA );
|
|
/* lock clock registers for read */
|
|
rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
|
|
|
|
sec = rtc_read( RTC_SECONDS );
|
|
min = rtc_read( RTC_MINUTES );
|
|
hour = rtc_read( RTC_HOURS );
|
|
mday = rtc_read( RTC_DAY_OF_MONTH );
|
|
wday = rtc_read( RTC_DAY_OF_WEEK );
|
|
mon = rtc_read( RTC_MONTH );
|
|
year = rtc_read( RTC_YEAR );
|
|
|
|
/* unlock clock registers after read */
|
|
rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
|
|
|
|
#ifdef RTC_DEBUG
|
|
printf( "Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
|
|
"hr: %02x min: %02x sec: %02x\n",
|
|
year, mon, mday, wday,
|
|
hour, min, sec );
|
|
#endif
|
|
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_wday = bcd2bin( wday & 0x07 );
|
|
|
|
/* glue year in century (2000) */
|
|
tmp->tm_year = bcd2bin( year ) + RTC_EPOCH;
|
|
|
|
tmp->tm_yday = 0;
|
|
tmp->tm_isdst= 0;
|
|
#ifdef RTC_DEBUG
|
|
printf( "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 );
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rtc_set( struct rtc_time *tmp )
|
|
{
|
|
uchar reg_a;
|
|
|
|
#ifdef RTC_DEBUG
|
|
printf( "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);
|
|
#endif
|
|
/* lock clock registers for write */
|
|
reg_a = rtc_read( RTC_CONTROLA );
|
|
rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
|
|
|
|
rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
|
|
|
|
rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
|
|
rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
|
|
rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
|
|
rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
|
|
rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
|
|
|
|
/* break year in century */
|
|
rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
|
|
|
|
/* unlock clock registers after read */
|
|
rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
|
|
}
|
|
|
|
void rtc_reset (void)
|
|
{
|
|
uchar reg_a, reg_b;
|
|
|
|
reg_a = rtc_read( RTC_CONTROLA );
|
|
reg_b = rtc_read( RTC_CONTROLB );
|
|
|
|
if ( reg_b & RTC_CB_OSC_DISABLE )
|
|
{
|
|
printf( "real-time-clock was stopped. Now starting...\n" );
|
|
reg_a |= RTC_CA_WRITE;
|
|
reg_b &= ~RTC_CB_OSC_DISABLE;
|
|
|
|
rtc_write( RTC_CONTROLA, reg_a );
|
|
rtc_write( RTC_CONTROLB, reg_b );
|
|
}
|
|
|
|
/* make sure read/write clock register bits are cleared */
|
|
reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
|
|
rtc_write( RTC_CONTROLA, reg_a );
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static uchar rtc_read( unsigned int addr )
|
|
{
|
|
uchar val = *(volatile unsigned char*)(addr);
|
|
|
|
#ifdef RTC_DEBUG
|
|
printf( "rtc_read: %x:%x\n", addr, val );
|
|
#endif
|
|
return( val );
|
|
}
|
|
|
|
static void rtc_write( unsigned int addr, uchar val )
|
|
{
|
|
#ifdef RTC_DEBUG
|
|
printf( "rtc_write: %x:%x\n", addr, val );
|
|
#endif
|
|
*(volatile unsigned char*)(addr) = 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
|