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/*
* linux/include/asm-arm/arch-ebsa285/time.h
*
* Copyright (c) 1998 Russell King.
* Copyright (c) 1998 Phil Blundell
*
* CATS has a real-time clock, though the evaluation board doesn't.
*
* Changelog:
* 21-Mar-1998 RMK Created
* 27-Aug-1998 PJB CATS support
* 28-Dec-1998 APH Made leds optional
*/
#define RTC_PORT(x) (0x72+(x))
#define RTC_ALWAYS_BCD 1
#include <linux/config.h>
#include <asm/leds.h>
#include <asm/system.h>
#include <linux/mc146818rtc.h>
extern __inline__ unsigned long gettimeoffset (void)
{
unsigned long value = LATCH - *CSR_TIMER1_VALUE;
return (tick * value) / LATCH;
}
extern __inline__ int reset_timer (void)
{
*CSR_TIMER1_CLR = 0;
#ifdef CONFIG_LEDS
/*
* Do the LEDs thing on EBSA-285 hardware.
*/
if (!machine_is_cats()) {
static unsigned int count = 50;
static int last_pid;
if (current->pid != last_pid) {
last_pid = current->pid;
if (last_pid)
leds_event(led_idle_end);
else
leds_event(led_idle_start);
}
if (--count == 0) {
count = 50;
leds_event(led_timer);
}
}
#endif
return 1;
}
/*
* We don't have a RTC to update!
*/
#define update_rtc()
/*
* Set up timer interrupt, and return the current time in seconds.
*/
extern __inline__ unsigned long setup_timer (void)
{
int year, mon, day, hour, min, sec;
/*
* Default the date to 1 Jan 1970 0:0:0
*/
year = 1970; mon = 1; day = 1;
hour = 0; min = 0; sec = 0;
*CSR_TIMER1_CLR = 0;
*CSR_TIMER1_LOAD = LATCH;
*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;
if (machine_is_cats())
{
int i;
/*
* Read the real time from the Dallas chip. (Code borrowed
* from arch/i386/kernel/time.c).
*/
/* The Linux interpretation of the CMOS clock register contents:
* When the Update-In-Progress (UIP) flag goes from 1 to 0, the
* RTC registers show the second which has precisely just started.
* Let's hope other operating systems interpret the RTC the same way.
*/
/* read RTC exactly on falling edge of update flag */
for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
break;
for (i = 0 ; i < 1000000 ; i++) /* must try at least 2.228 ms */
if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
break;
do { /* Isn't this overkill ? UIP above should guarantee consistency */
sec = CMOS_READ(RTC_SECONDS);
min = CMOS_READ(RTC_MINUTES);
hour = CMOS_READ(RTC_HOURS);
day = CMOS_READ(RTC_DAY_OF_MONTH);
mon = CMOS_READ(RTC_MONTH);
year = CMOS_READ(RTC_YEAR);
} while (sec != CMOS_READ(RTC_SECONDS));
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
{
BCD_TO_BIN(sec);
BCD_TO_BIN(min);
BCD_TO_BIN(hour);
BCD_TO_BIN(day);
BCD_TO_BIN(mon);
BCD_TO_BIN(year);
}
if ((year += 1900) < 1970)
year += 100;
}
return mktime(year, mon, day, hour, min, sec);
}
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