linux-kernel - Re: [PATCH 08/57] microblaze_v7: Interrupt handling, timer support, selfmod code

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Message-ID: <alpine.LFD.2.00.0903201100040.29264@localhost.localdomain>
Date:	Fri, 20 Mar 2009 11:07:53 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Michal Simek <monstr@...str.eu>
cc:	LKML <linux-kernel@...r.kernel.org>, john.williams@...alogix.com,
	John Stultz <johnstul@...ibm.com>
Subject: Re: [PATCH 08/57] microblaze_v7: Interrupt handling, timer support,
 selfmod code

On Fri, 20 Mar 2009, Michal Simek wrote:
> > Well. Either you have one shot mode, then better make it work and
> > useable or just remove the one shot support until you figure out how
> > to do it.
> 
> I don't have it - this feature is not there. There is only printk message in
> set_mode function.
> 
> What is the best timer implementation in kernel? (For inspiration)

There is no best :) All timers have usualy some weird hardware
constraints so that code is always ugly. But just as an example:

static int lapic_next_event(unsigned long delta, struct clock_event_device *evt)
{
        apic_write(APIC_TMICT, delta);
        return 0;
}

I think that's pretty close to your hardware. delta is the number of
timer cycles until the next event. There is no other magic with the
one shot mode :)
 
Thanks,

	tglx
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