From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from oz.embeddedARM.com (oz.embeddedarm.com [67.40.67.44]) by ozlabs.org (Postfix) with ESMTP id 9C870DE052 for ; Thu, 23 Apr 2009 04:01:44 +1000 (EST) Message-ID: <49EF5C4D.6040402@embeddedarm.com> Date: Wed, 22 Apr 2009 11:05:01 -0700 From: Eddie Dawydiuk MIME-Version: 1.0 To: Grant Likely Subject: Re: FPGA IRQ design question References: <49EF2E82.9080905@embeddedarm.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Grant, > However, if you're writing one-off custom drivers and there is no > common coded needed for acking irqs, then I would probably just use > the external IRQ. Thanks for the suggestions I think going to just use the external IRQ. As a result I've been reading through a few different dts files to try to understand how/where to specify this in the dts file. I see in the Yosemite dts file the PCI bus device node has an interrupt-map-mask and an interrupt-map. e.g. PCI0: pci@ec000000 { device_type = "pci"; ... /* Bamboo has all 4 IRQ pins tied together per slot */ interrupt-map-mask = <0xf800 0x0 0x0 0x0>; interrupt-map = < /* IDSEL 1 */ 0x800 0x0 0x0 0x0 &UIC0 0x1c 0x8 ... }; As far as I can tell this appears to be the proper location to specify that the PCI device(FPGA) connects an the IRQ to an external IRQ on the AMCC 440EP. I see where the interrupt controller(e.g. &UIC0), the interrupt number(0x1C), and the sense(0x8) of the external interrupt is specified. But I'm a bit puzzled by some of the other information. Is this the proper place in the dts file to specify that the FPGA connects and external interrupt to the SoC? Can you point me to a document explaining the interrupt-map-mask and interrupt-map arguments? Thanks for any pointers. -- Best Regards, ________________________________________________________________ Eddie Dawydiuk, Technologic Systems | voice: (480) 837-5200 16525 East Laser Drive | fax: (480) 837-5300 Fountain Hills, AZ 85268 | web: www.embeddedARM.com