On Fri, 28 Mar 2008 14:36:08 +0300, Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx> wrote:
> > Correct - and cevt-r4k won't be usable either. I guess that means you
> > leave the user the choice between either these two or using wait. Not
> > nice but ...
>
> The Alchemy code doesn't even try to use CP0 counter when CONFIG_PM=y if
> you look into arch/mips/au1000/common/time.c... or at least it didn't before
> Atsushi removed do_fast_pm_gettimeoffset().
Oh, yes. At that time I tried to implement clocksource drivers for
non-standard timers, but it seems I had missied Alchemy PM=y case.
The driver would be something like this? Completely untested ;-)
static cycle_t au1000_hpt_read(void)
{
return au_readl(SYS_TOYREAD);
}
struct clocksource au1000_clocksource = {
.name = "au1000-counter",
.rating = 200,
.read = au1000_hpt_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
void __init au1000_clocksource_init(unsinged long cpu_speed)
{
struct clocksource *cs = &au1000_clocksource;
clocksource_set_clock(cs, cpu_speed);
clocksource_register(cs);
}
---
Atsushi Nemoto
