From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756208AbZGUVR4 (ORCPT ); Tue, 21 Jul 2009 17:17:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756115AbZGUVRx (ORCPT ); Tue, 21 Jul 2009 17:17:53 -0400 Received: from moutng.kundenserver.de ([212.227.17.9]:57322 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755898AbZGUVP5 convert rfc822-to-8bit (ORCPT ); Tue, 21 Jul 2009 17:15:57 -0400 From: Arnd Bergmann To: Jiri Slaby Subject: Re: Do cpu-endian MMIO accessors exist? Date: Tue, 21 Jul 2009 23:15:49 +0200 User-Agent: KMail/1.12.0 (Linux/2.6.31-3-generic; KDE/4.2.96; x86_64; ; ) Cc: Pekka Paalanen , linux-kernel@vger.kernel.org References: <20090721234243.1928d9e2@daedalus.pq.iki.fi> <4A662C33.7080505@gmail.com> In-Reply-To: <4A662C33.7080505@gmail.com> X-Face: I@=L^?./?$U,EK.)V[4*>`zSqm0>65YtkOe>TFD'!aw?7OVv#~5xd\s,[~w]-J!)|%=]> =?utf-8?q?+=0A=09=7EohchhkRGW=3F=7C6=5FqTmkd=5Ft=3FLZC=23Q-=60=2E=60Y=2Ea=5E?= =?utf-8?q?3zb?=) =?utf-8?q?+U-JVN=5DWT=25cw=23=5BYo0=267C=26bL12wWGlZi=0A=09=7EJ=3B=5Cwg?= =?utf-8?q?=3B3zRnz?=,J"CT_)=\H'1/{?SR7GDu?WIopm.HaBG=QYj"NZD_[zrM\Gip^U MIME-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Message-Id: <200907212315.50225.arnd@arndb.de> X-Provags-ID: V01U2FsdGVkX18iai+yafHkOdsJDhZDkWL+lQl+Y7OS+5c3mqI yofkgcVYE/cWs2NNDYkYTfE3I00ZdywmGmxDxAznwQZ+FmEKFS USIIddaHG/l0fZEEVDLVg== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 21 July 2009, Jiri Slaby wrote: > > Do cpu-endian MMIO accessors exist? What should I use, or do I just > > have to use #ifdef __BIG_ENDIAN? > > There is __raw_readl which doesn't switch bytes. __raw_readl is not a replacement for real accessors like ioread32 or in_be32, because it does not synchronize with the instruction stream. The best solution would be if you could find a way to set the hardware into little-endian mode on all architectures. >>From the description, it sounds like the hardware should allow that. Arnd <><