From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 68.mail-out.ovh.net ([91.121.185.69]) by canuck.infradead.org with smtp (Exim 4.72 #1 (Red Hat Linux)) id 1PK3kd-0005mt-5K for barebox@lists.infradead.org; Sun, 21 Nov 2010 06:50:16 +0000 Date: Sun, 21 Nov 2010 07:46:28 +0100 From: Jean-Christophe PLAGNIOL-VILLARD Message-ID: <20101121064628.GJ4216@game.jcrosoft.org> References: <20101112180228.GC13661@game.jcrosoft.org> <1289585938-22813-1-git-send-email-plagnioj@jcrosoft.com> <20101119080049.GA6017@pengutronix.de> <20101119113009.GB4216@game.jcrosoft.org> <20101120134017.GF6017@pengutronix.de> <20101120135824.GE4216@game.jcrosoft.org> <20101121042854.GI4216@game.jcrosoft.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20101121042854.GI4216@game.jcrosoft.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH 1/5] device: introduce resource structure to simplify resource delaration To: Sascha Hauer Cc: barebox@lists.infradead.org On 05:28 Sun 21 Nov , Jean-Christophe PLAGNIOL-VILLARD wrote: > On 14:58 Sat 20 Nov , Jean-Christophe PLAGNIOL-VILLARD wrote: > > On 14:40 Sat 20 Nov , Sascha Hauer wrote: > > > On Fri, Nov 19, 2010 at 12:30:09PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > > > > On 09:00 Fri 19 Nov , Sascha Hauer wrote: > > > > > Hi J, > > > > > > > > > > On Fri, Nov 12, 2010 at 07:18:54PM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > > > > > > introdude also some helper to manager them > > > > > > > > > > > > and add multi resource per device support > > > > > > > > > > > > ram device: use resource structure instead of memory_platform_data > > > > > > > > > > > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD > > > > > > > > > > > > > > > You shouldn't use a resource_size_t type to access registers. This will > > > > > lead to problems when we start to support 64bit resource sizes > > > > no as resource_size_t is 64 bit aware > > > > > > And exactly this is the problem. void * is usually only 32bit on arm. > > > This will lead to compiler warnings and sparse isn't happy about > > > unsigned long in readl/writel anyway. > > IIRC on arm resource_size_t is never 64bit at least on the current ARMvx > > > > > > > > > >. Instead we should introduce a > > > > > > > > > > #define resource_size_to_iomem(size) (void __force __iomem *)(size) > > > > > > > > > > macro which does the conversion to a void __iomem * type. In a more > > > > > advanced version this could also spit a warning when the resource start > > > > > is bigger than a pointer type. As an additional plus we'll get rid of > > > > > some sparse warnings where map_base is used for readl/writel. > > > > we do not do in the kernel and do see the advantage here for the ressource > > > > in mind it's in the drivers we need to do it > > > > if necessary > > > > > > resource_size_t is never passed to readl/writel in the kernel. > > yeah but the resources are cast in the drivers > I check on x86 and void is 4 byte on 32bit and 8bytes on 64bit I check on x86 and void* is 4 byte on 32bit and 8bytes on 64bit Best Regards, J. _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox