linux-kernel - Re: PIR OFFSET for AR7

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Message-ID: <20091204160333.GA8842@alpha.franken.de>
Date:	Fri, 4 Dec 2009 17:03:33 +0100
From:	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:	myuboot@...tmail.fm
Cc:	linux-kernel@...r.kernel.org,
	linux-mips <linux-mips@...ux-mips.org>
Subject: Re: PIR OFFSET for AR7

On Thu, Dec 03, 2009 at 07:52:30PM -0600, myuboot@...tmail.fm wrote:
> Hi, What is the use of PIR register for AR7 board in file
> arch/mips/ar7/irq.c?

it gives back the channel and line of the pending interrupt with the
highest priority.

> If I understand it right, PIR is used to define the
> polarity of the interrupts. It seems to me that it needs to initialized?

no, it's a read only register. Why do you think it has something to do
with interrupt polarity ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea.                                                [ RFC1925, 2.3 ]
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