Re: RTC todr for mips/alchemy

"Garrett D'Amore" wrote:

> Shigeyuki Fukushima wrote:
> > Garrett D'Amore wrote:
> >   
> >> Take a look at sys/arch/evbmips/clock.c
> >>     
> >
> > There is no todr_attach() function in it.
> > I want to add todr_attach() to it.
> > Because this function is defined at sys/dev/clock_subr.h.
> > This is a device-general function.
> >
> > Would you like to look at sys/dev/clock_subr.{c,h}?
> >   
> Okay, so the problem, as I see it, is that clock.c in
> evbmips/evbmips/clock.c doesn't follow the clock_subr.h stuff.
> 
> So, what I think we need to do is implement todr_attach in
> evbmips/evbmips/clock.c, so that it can make use of your rtc driver.
> 
> What we do *not* need is a seperate and new RTC driver.
> 
> Possibly (probably!) the other evbmips clock drivers (aurrtc and
> mcclock.c) should be converted to use the MI todr logic.
> 
> Frankly, I like this idea a lot.
> 
> But, the first step is to make evbmips/evmips/clock.c support todr_attach.
> 
> That should be the direction you proceed, I think.

I think the todr_attach() stuff was relatively new when I first did
evbmips, and it's been something that I keep meaning to convert evbmips
over too.  As Garrett said, this should be the first step.

> >> In your kernel config, you must *only* have one of aurrtc or your rtc. 
> >> multiple devices trying to clockattach() will panic.
> >>     
> This is also something you could look at possibly changing when you are
> doing your work.  Although as a first coarse pass you could probably
> just continue to panic in this case.

Alchemy is a bit funny here.  Almost every other machine has a single
physical RTC whereas the Alchemy CPUs have a on-chip one that will
always exist and possibly a separate physical RTC.  I think at this
stage we should special case the aurtc driver somehow rather than making
a generic change that affects all evbmips ports.  Just how, I'm not sure
of right now...

Simon.
--
Simon Burge                            <[email protected]>
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