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/*
* linux/include/asm-arm/arch-rpc/time.h
*
* Copyright (c) 1996 Russell King.
*
* Changelog:
* 24-Sep-1996 RMK Created
* 10-Oct-1996 RMK Brought up to date with arch-sa110eval
* 04-Dec-1997 RMK Updated for new arch/arm/time.c
*/
extern __inline__ unsigned long gettimeoffset (void)
{
unsigned long offset = 0;
unsigned int count1, count2, status1, status2;
status1 = IOMD_IRQREQA;
barrier ();
outb(0, IOMD_T0LATCH);
barrier ();
count1 = inb(IOMD_T0CNTL) | (inb(IOMD_T0CNTH) << 8);
barrier ();
status2 = inb(IOMD_IRQREQA);
barrier ();
outb(0, IOMD_T0LATCH);
barrier ();
count2 = inb(IOMD_T0CNTL) | (inb(IOMD_T0CNTH) << 8);
if (count2 < count1) {
/*
* This means that we haven't just had an interrupt
* while reading into status2.
*/
if (status2 & (1 << 5))
offset = tick;
count1 = count2;
} else if (count2 > count1) {
/*
* We have just had another interrupt while reading
* status2.
*/
offset += tick;
count1 = count2;
}
count1 = LATCH - count1;
/*
* count1 = number of clock ticks since last interrupt
*/
offset += count1 * tick / LATCH;
return offset;
}
/*
* No need to reset the timer at every irq
*/
#define reset_timer() 1
/*
* Updating of the RTC. We don't currently write the time to the
* CMOS clock.
*/
#define update_rtc()
/*
* Set up timer interrupt, and return the current time in seconds.
*/
extern __inline__ unsigned long setup_timer (void)
{
extern int iic_control (unsigned char, int, char *, int);
unsigned int year, mon, day, hour, min, sec;
char buf[8];
outb(LATCH & 255, IOMD_T0LTCHL);
outb(LATCH >> 8, IOMD_T0LTCHH);
outb(0, IOMD_T0GO);
iic_control (0xa0, 0xc0, buf, 1);
year = buf[0];
if ((year += 1900) < 1970)
year += 100;
iic_control (0xa0, 2, buf, 5);
mon = buf[4] & 0x1f;
day = buf[3] & 0x3f;
hour = buf[2];
min = buf[1];
sec = buf[0];
BCD_TO_BIN(mon);
BCD_TO_BIN(day);
BCD_TO_BIN(hour);
BCD_TO_BIN(min);
BCD_TO_BIN(sec);
return mktime(year, mon, day, hour, min, sec);
}
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