mk48t59.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
*/
/*
* Date & Time support for the MK48T59 RTC
*/
#undef RTC_DEBUG
#include <common.h>
#include <command.h>
#include <config.h>
#include <rtc.h>
#include <mk48t59.h>
#if defined(CONFIG_BAB7xx)
static uchar rtc_read (short reg)
{
out8(RTC_PORT_ADDR0, reg & 0xFF);
out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
return in8(RTC_PORT_DATA);
}
static void rtc_write (short reg, uchar val)
{
out8(RTC_PORT_ADDR0, reg & 0xFF);
out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
out8(RTC_PORT_DATA, val);
}
#elif defined(CONFIG_EVAL5200)
static uchar rtc_read (short reg)
{
return in8(RTC(reg));
}
static void rtc_write (short reg, uchar val)
{
out8(RTC(reg),val);
}
#else
# error Board specific rtc access functions should be supplied
#endif
/* ------------------------------------------------------------------------- */
void *nvram_read(void *dest, const short src, size_t count)
{
uchar *d = (uchar *) dest;
short s = src;
while (count--)
*d++ = rtc_read(s++);
return dest;
}
void nvram_write(short dest, const void *src, size_t count)
{
short d = dest;
uchar *s = (uchar *) src;
while (count--)
rtc_write(d++, *s++);
}
/* ------------------------------------------------------------------------- */
int rtc_get (struct rtc_time *tmp)
{
uchar save_ctrl_a;
uchar sec, min, hour, mday, wday, mon, year;
/* Simple: freeze the clock, read it and allow updates again */
save_ctrl_a = rtc_read(RTC_CONTROLA);
/* Set the register to read the value. */
save_ctrl_a |= RTC_CA_READ;
rtc_write(RTC_CONTROLA, save_ctrl_a);
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);
/* re-enable update */
save_ctrl_a &= ~RTC_CA_READ;
rtc_write(RTC_CONTROLA, save_ctrl_a);
#ifdef RTC_DEBUG
printf ( "Get RTC year: %02x mon/cent: %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_year = bcd2bin (year);
tmp->tm_wday = bcd2bin (wday & 0x07);
if(tmp->tm_year<70)
tmp->tm_year+=2000;
else
tmp->tm_year+=1900;
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;
}
int rtc_set (struct rtc_time *tmp)
{
uchar save_ctrl_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
save_ctrl_a = rtc_read(RTC_CONTROLA);
save_ctrl_a |= RTC_CA_WRITE;
rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */
rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
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 ));
save_ctrl_a &= ~RTC_CA_WRITE;
rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */
return 0;
}
void rtc_reset (void)
{
uchar control_b;
/*
* Start oscillator here.
*/
control_b = rtc_read(RTC_CONTROLB);
control_b &= ~RTC_CB_STOP;
rtc_write(RTC_CONTROLB, control_b);
}
void rtc_set_watchdog(short multi, short res)
{
uchar wd_value;
wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
rtc_write(RTC_WATCHDOG, wd_value);
}