From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from buildserver.ru.mvista.com (unknown [85.21.88.6]) by ozlabs.org (Postfix) with ESMTP id EBA13DDF59 for ; Wed, 13 Aug 2008 00:31:11 +1000 (EST) Date: Tue, 12 Aug 2008 18:31:10 +0400 From: Anton Vorontsov To: Sergei Shtylyov Subject: Re: [PATCH] pata_of_platform: fix no irq handling Message-ID: <20080812143110.GA23961@oksana.dev.rtsoft.ru> References: <48A05152.7020508@harris.com> <20080811151913.GA14690@oksana.dev.rtsoft.ru> <48A0676E.5020308@harris.com> <20080811170756.GA29827@oksana.dev.rtsoft.ru> <1218492032.8041.11.camel@pasglop> <48A19788.6050502@harris.com> <20080812140457.GA9103@oksana.dev.rtsoft.ru> <48A19BC2.8060008@ru.mvista.com> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1251 In-Reply-To: <48A19BC2.8060008@ru.mvista.com> Cc: "Sparks, Sam" , linuxppc-dev@ozlabs.org, linux-ide@vger.kernel.org, Stefan Roese , Jeff Garzik Reply-To: avorontsov@ru.mvista.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, Aug 12, 2008 at 06:18:42PM +0400, Sergei Shtylyov wrote: > Anton Vorontsov wrote: > >>>>> 1. IDE status read does not work. (But am I understand correctly >>>>> that IDE works well if IRQ is unspecified? Then this is hardly >>>>> an issue.) >>>>> 2. IDE interrupt comes when it should not. I'd recommend to use >>>>> oscilloscope to find out what is happening there, that is, if >>>>> the drive actually deasserts its irq line after status read. >>>>> If so, than this could be a PIC problem. > >>>>> What is the platform on which you're observing the issue, btw? > >>>> Another possibility is that you got the wrong interrupt number >>>> in the device-tree... > >>>> Ben. > >>> The platform is the AMCC Sequoia board. We've built a little adapter to >>> connect a compact flash card to the processor bus. I believe the >>> interrupt selection in the device tree is correct, and I've checked over >>> the u-boot settings for the IRQ line (active high, level sensitive). > >> IDE IRQs are active-low. > > Only on the PCI and only in the native mode. Natively, the IDE INTRQ > signal is active-high, rising edge triggering, as on ISA. You seem to > have an invertor somewhere, if it's not a PCI chip... Ugh. Right you are, as always. I've just looked into mpc8349emitx schematics, there is indeed an inverter on the irq line. CF in True IDE mode is active-high, sorry. -- Anton Vorontsov email: cbouatmailru@gmail.com irc://irc.freenode.net/bd2