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