102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
|
|
* (C) Copyright 2008, 2009
|
|
* Andreas Pfefferle, DENX Software Engineering, ap@denx.de.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm/io.h>
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <config.h>
|
|
#include <rtc.h>
|
|
#include <tws.h>
|
|
|
|
#if defined(CONFIG_CMD_DATE)
|
|
|
|
/*
|
|
* Note: The acrobatics below is due to the hideously ingenius idea of
|
|
* the chip designers. As the chip does not allow register
|
|
* addressing, all values need to be read and written in one go. Sure
|
|
* enough, the 'wday' field (0-6) is transferred using the economic
|
|
* number of 4 bits right in the middle of the packet.....
|
|
*/
|
|
|
|
int rtc_get(struct rtc_time *tm)
|
|
{
|
|
int rel = 0;
|
|
uchar buffer[7];
|
|
|
|
memset(buffer, 0, 7);
|
|
|
|
/* Read 52 bits into our buffer */
|
|
tws_read(buffer, 52);
|
|
|
|
tm->tm_sec = bcd2bin( buffer[0] & 0x7F);
|
|
tm->tm_min = bcd2bin( buffer[1] & 0x7F);
|
|
tm->tm_hour = bcd2bin( buffer[2] & 0x3F);
|
|
tm->tm_wday = bcd2bin( buffer[3] & 0x07);
|
|
tm->tm_mday = bcd2bin((buffer[3] & 0xF0) >> 4 | (buffer[4] & 0x0F) << 4);
|
|
tm->tm_mon = bcd2bin((buffer[4] & 0x30) >> 4 | (buffer[5] & 0x0F) << 4);
|
|
tm->tm_year = bcd2bin((buffer[5] & 0xF0) >> 4 | (buffer[6] & 0x0F) << 4) + 2000;
|
|
tm->tm_yday = 0;
|
|
tm->tm_isdst = 0;
|
|
|
|
if (tm->tm_sec & 0x80) {
|
|
puts("### Warning: RTC Low Voltage - date/time not reliable\n");
|
|
rel = -1;
|
|
}
|
|
|
|
debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
|
|
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
return rel;
|
|
}
|
|
|
|
int rtc_set(struct rtc_time *tm)
|
|
{
|
|
uchar buffer[7];
|
|
uchar tmp;
|
|
|
|
debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
|
|
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
memset(buffer, 0, 7);
|
|
buffer[0] = bin2bcd(tm->tm_sec);
|
|
buffer[1] = bin2bcd(tm->tm_min);
|
|
buffer[2] = bin2bcd(tm->tm_hour);
|
|
buffer[3] = bin2bcd(tm->tm_wday);
|
|
tmp = bin2bcd(tm->tm_mday);
|
|
buffer[3] |= (tmp & 0x0F) << 4;
|
|
buffer[4] = (tmp & 0xF0) >> 4;
|
|
tmp = bin2bcd(tm->tm_mon);
|
|
buffer[4] |= (tmp & 0x0F) << 4;
|
|
buffer[5] = (tmp & 0xF0) >> 4;
|
|
tmp = bin2bcd(tm->tm_year % 100);
|
|
buffer[5] |= (tmp & 0x0F) << 4;
|
|
buffer[6] = (tmp & 0xF0) >> 4;
|
|
|
|
/* Write the resulting 52 bits to device */
|
|
tws_write(buffer, 52);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rtc_reset(void)
|
|
{
|
|
struct rtc_time tmp;
|
|
|
|
tmp.tm_sec = 0;
|
|
tmp.tm_min = 0;
|
|
tmp.tm_hour = 0;
|
|
tmp.tm_wday = 4;
|
|
tmp.tm_mday = 1;
|
|
tmp.tm_mon = 1;
|
|
tmp.tm_year = 2000;
|
|
rtc_set(&tmp);
|
|
}
|
|
|
|
#endif
|