/* Kick start a stopped clock (procedure from the Sun NVRAM/hostid FAQ). */
static void __init kick_start_clock(void)
{
struct mostek48t02 *regs = (struct mostek48t02 *)mstk48t02_regs;
unsigned char sec;
int i, count;
prom_printf("CLOCK: Clock was stopped. Kick start ");
spin_lock_irq(&mostek_lock);
/* Turn on the kick start bit to start the oscillator. */
regs->creg |= MSTK_CREG_WRITE;
regs->sec &= ~MSTK_STOP;
regs->hour |= MSTK_KICK_START;
regs->creg &= ~MSTK_CREG_WRITE;
spin_unlock_irq(&mostek_lock);
/* Delay to allow the clock oscillator to start. */
sec = MSTK_REG_SEC(regs);
for (i = 0; i < 3; i++) {
while (sec == MSTK_REG_SEC(regs))
for (count = 0; count < 100000; count++)
/* nothing */ ;
prom_printf(".");
sec = regs->sec;
}
prom_printf("\n");
spin_lock_irq(&mostek_lock);
/* Turn off kick start and set a "valid" time and date. */
regs->creg |= MSTK_CREG_WRITE;
regs->hour &= ~MSTK_KICK_START;
MSTK_SET_REG_SEC(regs,0);
MSTK_SET_REG_MIN(regs,0);
MSTK_SET_REG_HOUR(regs,0);
MSTK_SET_REG_DOW(regs,5);
MSTK_SET_REG_DOM(regs,1);
MSTK_SET_REG_MONTH(regs,8);
MSTK_SET_REG_YEAR(regs,1996 - MSTK_YEAR_ZERO);
regs->creg &= ~MSTK_CREG_WRITE;
spin_unlock_irq(&mostek_lock);
/* Ensure the kick start bit is off. If it isn't, turn it off. */
while (regs->hour & MSTK_KICK_START) {
prom_printf("CLOCK: Kick start still on!\n");
spin_lock_irq(&mostek_lock);
regs->creg |= MSTK_CREG_WRITE;
regs->hour &= ~MSTK_KICK_START;
regs->creg &= ~MSTK_CREG_WRITE;
spin_unlock_irq(&mostek_lock);
}
prom_printf("CLOCK: Kick start procedure successful.\n");
}
/* Retrieve the current date and time from the real time clock. */
static void get_rtc_time(struct rtc_time *t)
{
void __iomem *regs = mstk48t02_regs;
u8 tmp;
spin_lock_irq(&mostek_lock);
tmp = mostek_read(regs + MOSTEK_CREG);
tmp |= MSTK_CREG_READ;
mostek_write(regs + MOSTEK_CREG, tmp);
t->sec = MSTK_REG_SEC(regs);
t->min = MSTK_REG_MIN(regs);
t->hour = MSTK_REG_HOUR(regs);
t->dow = MSTK_REG_DOW(regs);
t->dom = MSTK_REG_DOM(regs);
t->month = MSTK_REG_MONTH(regs);
t->year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
tmp = mostek_read(regs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_READ;
mostek_write(regs + MOSTEK_CREG, tmp);
spin_unlock_irq(&mostek_lock);
}
/* Retrieve the current date and time from the real time clock. */
void get_rtc_time(struct rtc_time *t)
{
unsigned long regs = mstk48t02_regs;
unsigned long flags;
u8 tmp;
save_flags(flags);
cli();
tmp = mostek_read(regs + MOSTEK_CREG);
tmp |= MSTK_CREG_READ;
mostek_write(regs + MOSTEK_CREG, tmp);
t->sec = MSTK_REG_SEC(regs);
t->min = MSTK_REG_MIN(regs);
t->hour = MSTK_REG_HOUR(regs);
t->dow = MSTK_REG_DOW(regs);
t->dom = MSTK_REG_DOM(regs);
t->month = MSTK_REG_MONTH(regs);
t->year = MSTK_CVT_YEAR( MSTK_REG_YEAR(regs) );
tmp = mostek_read(regs + MOSTEK_CREG);
tmp &= ~MSTK_CREG_READ;
mostek_write(regs + MOSTEK_CREG, tmp);
restore_flags(flags);
}
void __init sbus_time_init(void)
{
unsigned int year, mon, day, hour, min, sec;
struct mostek48t02 *mregs;
#ifdef CONFIG_SUN4
int temp;
struct intersil *iregs;
#endif
BTFIXUPSET_CALL(bus_do_settimeofday, sbus_do_settimeofday, BTFIXUPCALL_NORM);
btfixup();
if (ARCH_SUN4)
sun4_clock_probe();
else
clock_probe();
sparc_init_timers(timer_interrupt);
#ifdef CONFIG_SUN4
if(idprom->id_machtype == (SM_SUN4 | SM_4_330)) {
#endif
mregs = (struct mostek48t02 *)mstk48t02_regs;
if(!mregs) {
prom_printf("Something wrong, clock regs not mapped yet.\n");
prom_halt();
}
spin_lock_irq(&mostek_lock);
mregs->creg |= MSTK_CREG_READ;
sec = MSTK_REG_SEC(mregs);
min = MSTK_REG_MIN(mregs);
hour = MSTK_REG_HOUR(mregs);
day = MSTK_REG_DOM(mregs);
mon = MSTK_REG_MONTH(mregs);
year = MSTK_CVT_YEAR( MSTK_REG_YEAR(mregs) );
xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
mregs->creg &= ~MSTK_CREG_READ;
spin_unlock_irq(&mostek_lock);
#ifdef CONFIG_SUN4
} else if(idprom->id_machtype == (SM_SUN4 | SM_4_260) ) {
/* initialise the intersil on sun4 */
iregs=intersil_clock;
if(!iregs) {
prom_printf("Something wrong, clock regs not mapped yet.\n");
prom_halt();
}
intersil_intr(intersil_clock,INTERSIL_INT_100HZ);
disable_pil_irq(10);
intersil_stop(iregs);
intersil_read_intr(intersil_clock, temp);
temp = iregs->clk.int_csec;
sec = iregs->clk.int_sec;
min = iregs->clk.int_min;
hour = iregs->clk.int_hour;
day = iregs->clk.int_day;
mon = iregs->clk.int_month;
year = MSTK_CVT_YEAR(iregs->clk.int_year);
enable_pil_irq(10);
intersil_start(iregs);
xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
printk("%u/%u/%u %u:%u:%u\n",day,mon,year,hour,min,sec);
}
#endif
/* Now that OBP ticker has been silenced, it is safe to enable IRQ. */
local_irq_enable();
}
