linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Message-Id: <fa84736ae121902d4bee24eb23ca1d0b@kernel.crashing.org>
Date:	Sat, 19 May 2007 14:28:14 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	"Albert Cahalan" <acahalan@...il.com>
Cc:	tglx@...utronix.de, "Sergei Shtylyov" <sshtylyov@...mvista.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

>> Unfortunately, FIT exists only on Book E CPUs and MPC74xx aren't Book 
>> E, IIUC.
>
> By the name "FIT" perhaps, but MPC74xx has essentially
> the same thing.

> Set MMCR0[TBEE], set MMCR0[PMXE], and choose a TBL bit via 
> MMCR0[TBSEL].

That's the performance monitor, which could very well be
in use already (for performance monitoring stuff, who
would have guessed).

> It's also possible to trigger on the CPU cycle counter, but this would
> cost one of the performance counters. MPC7400 has 4, later CPUs have 6
> or more, and I think xPC7x0 had only 2.

7xx has at least four as well.


Segher

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