From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Randy.Dunlap" Subject: Re: iomapping a big endian area Date: Mon, 04 Apr 2005 07:22:20 -0700 Message-ID: <42514D9C.2070003@osdl.org> References: <1112475134.5786.29.camel@mulgrave> <20050403013757.GB24234@parcelfarce.linux.theplanet.co.uk> <20050402183805.20a0cf49.davem@davemloft.net> <20050403031000.GC24234@parcelfarce.linux.theplanet.co.uk> <1112499639.5786.34.camel@mulgrave> <20050402200858.37347bec.davem@davemloft.net> <1112502477.5786.38.camel@mulgrave> <1112601039.26086.49.camel@gaston> <1112623143.5813.5.camel@mulgrave> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from fire.osdl.org ([65.172.181.4]:10147 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S261244AbVDDOWY (ORCPT ); Mon, 4 Apr 2005 10:22:24 -0400 In-Reply-To: <1112623143.5813.5.camel@mulgrave> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: Benjamin Herrenschmidt , "David S. Miller" , matthew@wil.cx, SCSI Mailing List , Linux Kernel list James Bottomley wrote: > On Mon, 2005-04-04 at 17:50 +1000, Benjamin Herrenschmidt wrote: > >>I disagree. The driver will never "know" ... > > > ? the driver has to know. Look at the 53c700 to see exactly how awful > it is. This beast has byte and word registers. When used BE, all the > byte registers alter their position (to both inb and readb). > > >>I don't think it's sane. You know that your device is BE or LE and use >>the appropriate interface. "native" doesn't make sense to me in this >>context. > > > Well ... it's like this. Native means "pass through without swapping" > and has an easy implementation on both BE and LE platforms. Logically > io{read,write}{16,32}be would have to do byte swaps on LE platforms. > Being lazy, I'm opposed to doing the work if there's no actual use for > it, so can you provide an example of a BE bus (or device) used on a LE > platform that would actually benefit from this abstraction? I would probably spell "native" as "noswap". "native" just doesn't convey enough specific meaning... -- ~Randy