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#include <sys/types.h>
#include "clockreg.h"
#include "config.h"
#include "clock.h"
/*
* BCD to decimal and decimal to BCD.
*/
#define FROM_BCD(x,y) ((x) + 10 * (y))
#define SECDAY (24 * 60 * 60)
#define SECYR (SECDAY * 365)
#define LEAPYEAR(y) (((y) & 3) == 0)
/*
* This code is defunct after 2068.
* Will Unix still be here then??
*/
const short dayyr[12] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
static u_long
chiptotime(sec, min, hour, day, mon, year)
register int sec, min, hour, day, mon, year;
{
register int days, yr;
if (year < 70)
year = 70;
/* simple sanity checks */
if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
return (0);
days = 0;
for (yr = 70; yr < year; yr++)
days += LEAPYEAR(yr) ? 366 : 365;
days += dayyr[mon - 1] + day - 1;
if (LEAPYEAR(yr) && mon > 2)
days++;
/* now have days since Jan 1, 1970; the rest is easy... */
return (days * SECDAY + hour * 3600 + min * 60 + sec);
}
static u_char *rtc_byte = (u_char *) 0x17020000;
static u_char
rtc_read_reg (int reg)
{
u_char res;
reg &= 0x0f;
*rtc_byte = RTC_WRITE_ADDR | reg;
*rtc_byte = reg;
*rtc_byte = RTC_READ | 0x0f;
res = *rtc_byte & 0x0f;
*rtc_byte = RTC_WRITE_ADDR | 0x0f;
*rtc_byte = 0x0f;
return res;
}
time_t
getsecs()
{
int sec, min, hour, hourl, hourh, day, mon, year;
sec = FROM_BCD (rtc_read_reg (RTC_SEC_LOW),
rtc_read_reg (RTC_SEC_HIGH));
min = FROM_BCD (rtc_read_reg (RTC_MIN_LOW),
rtc_read_reg (RTC_MIN_HIGH));
day = FROM_BCD (rtc_read_reg (RTC_DAY_LOW),
rtc_read_reg (RTC_DAY_HIGH));
mon = FROM_BCD (rtc_read_reg (RTC_MON_LOW),
rtc_read_reg (RTC_MON_HIGH));
year = RTC_YEAR_BASE + FROM_BCD (rtc_read_reg (RTC_YEAR_LOW),
rtc_read_reg (RTC_YEAR_HIGH));
hourl = rtc_read_reg (RTC_HOUR_LOW);
hourh = rtc_read_reg (RTC_HOUR_HIGH);
if (hourh & RTC_HOUR_PM)
hour = 12 + (hourh & 1) * 10 + hourl;
else
hour = (hourh & 0x03) * 10 + hourl;
return (chiptotime(sec, min, hour, day, mon, year));
}
void
disp_date (void)
{
static char *days[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
int hour, hourl, hourh, day, wday, mon, year;
wday = rtc_read_reg (RTC_WEEK_DAY);
day = FROM_BCD (rtc_read_reg (RTC_DAY_LOW),
rtc_read_reg (RTC_DAY_HIGH));
mon = FROM_BCD (rtc_read_reg (RTC_MON_LOW),
rtc_read_reg (RTC_MON_HIGH));
year = RTC_YEAR_BASE + FROM_BCD (rtc_read_reg (RTC_YEAR_LOW),
rtc_read_reg (RTC_YEAR_HIGH));
hourl = rtc_read_reg (RTC_HOUR_LOW);
hourh = rtc_read_reg (RTC_HOUR_HIGH);
if (hourh & RTC_HOUR_PM)
hour = 12 + (hourh & 1) * 10 + hourl;
else
hour = (hourh & 0x03) * 10 + hourl;
printf ("Date: %s %d-%d-%d %d:%d%d:%d%d\n",
days[wday],
1900 + year, mon, day,
hour,
rtc_read_reg (RTC_MIN_HIGH),
rtc_read_reg (RTC_MIN_LOW),
rtc_read_reg (RTC_SEC_HIGH),
rtc_read_reg (RTC_SEC_LOW));
}
int
getticks()
{
return getsecs() * 100;
}
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