static void __init alchemy_setup_c0timer(void)
{
/*
* MIPS kernel assigns 'au1k_wait' to 'cpu_wait' before this
* function is called. Because the Alchemy counters are unusable
* the C0 timekeeping code is installed and use of the 'wait'
* instruction must be prohibited, which is done most easily by
* assigning NULL to cpu_wait.
*/
cpu_wait = NULL;
r4k_clockevent_init();
init_r4k_clocksource();
}
void __init plat_time_init(void)
{
struct clock_event_device *cd = &au1x_rtcmatch2_clockdev;
unsigned long t;
/* Check if firmware (YAMON, ...) has enabled 32kHz and clock
* has been detected. If so install the rtcmatch2 clocksource,
* otherwise don't bother. Note that both bits being set is by
* no means a definite guarantee that the counters actually work
* (the 32S bit seems to be stuck set to 1 once a single clock-
* edge is detected, hence the timeouts).
*/
if (CNTR_OK != (au_readl(SYS_COUNTER_CNTRL) & CNTR_OK))
goto cntr_err;
/*
* setup counter 1 (RTC) to tick at full speed
*/
t = 0xffffff;
while ((au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_T1S) && --t)
asm volatile ("nop");
if (!t)
goto cntr_err;
au_writel(0, SYS_RTCTRIM); /* 32.768 kHz */
au_sync();
t = 0xffffff;
while ((au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C1S) && --t)
asm volatile ("nop");
if (!t)
goto cntr_err;
au_writel(0, SYS_RTCWRITE);
au_sync();
t = 0xffffff;
while ((au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C1S) && --t)
asm volatile ("nop");
if (!t)
goto cntr_err;
/* register counter1 clocksource and event device */
clocksource_set_clock(&au1x_counter1_clocksource, 32768);
clocksource_register(&au1x_counter1_clocksource);
cd->shift = 32;
cd->mult = div_sc(32768, NSEC_PER_SEC, cd->shift);
cd->max_delta_ns = clockevent_delta2ns(0xffffffff, cd);
cd->min_delta_ns = clockevent_delta2ns(8, cd); /* ~0.25ms */
clockevents_register_device(cd);
setup_irq(AU1000_RTC_MATCH2_INT, &au1x_rtcmatch2_irqaction);
printk(KERN_INFO "Alchemy clocksource installed\n");
/* can now use 'wait' */
allow_au1k_wait = 1;
return;
cntr_err:
/* counters unusable, use C0 counter */
r4k_clockevent_init();
init_r4k_clocksource();
allow_au1k_wait = 0;
}
void __init plat_time_init(void)
{
powertv_clocksource_init();
r4k_clockevent_init();
}
