From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from qw-out-2122.google.com (qw-out-2122.google.com [74.125.92.24]) by ozlabs.org (Postfix) with ESMTP id 9B086DDDEF for ; Tue, 28 Oct 2008 03:18:18 +1100 (EST) Received: by qw-out-2122.google.com with SMTP id 9so1642884qwb.15 for ; Mon, 27 Oct 2008 09:18:17 -0700 (PDT) Message-ID: <4905E9CC.5020709@genesi-usa.com> Date: Mon, 27 Oct 2008 11:18:20 -0500 From: Matt Sealey MIME-Version: 1.0 To: Jon Smirl Subject: Re: Using Bestcomm API (DMA) on MPC5200b with Linux? References: <406316.49476.qm@web25808.mail.ukl.yahoo.com> <4900FA72.1040201@genesi-usa.com> <9e4733910810240814p6d43eb0by4fc3c913b60063c3@mail.gmail.com> In-Reply-To: <9e4733910810240814p6d43eb0by4fc3c913b60063c3@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: Matt Sealey Cc: arieswar24b@yahoo.de, linuxppc-embedded@ozlabs.org List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , You know, Sylvain posted his patch the week after 2.6.23 was released so I guess it's a big fat no. However the original patchset or it (http://ozlabs.org/pipermail/linuxppc-dev/2007-October/044301.html) should patch very easily. The last thing you'd want is to code a driver using BestComm right now, and then move to a new kernel later on in development and have to rewrite it from scratch. The Freescale API really is dead as a dodo. -- Matt Sealey Genesi, Manager, Developer Relations Jon Smirl wrote: > Was the new BestComm support in the 2.6.23.1 kernel he is using? > > On Thu, Oct 23, 2008 at 6:28 PM, Matt Sealey wrote: >> You need to write a task that does the DMA operation you want; GenBD is >> actually pretty generic and lets you just copy from one place to another. >> >> The API is pretty simple; make sure genbd is compiled in, get the task >> structure using bcom_gen_bd_[tr]x_init, and then.. uhh.. this is where I >> always forget. >> >> There is a way to submit a buffer descriptor and have the engine basically >> perform that transfer. I think it's bcom_prepare_next_buffer and then >> bcom_submit_next_buffer. >> >> Actually I can't even FIND those functions in the Linux tree right now, but >> they have to be in there because the FEC driver uses them.. >> >> -- >> Matt Sealey >> Genesi, Manager, Developer Relations >> >> Dave Best wrote: >>> I am trying to connect a FPGA/FIFO with my MPC5200b on a phytec PCM 030 >>> board while running a 2.6.23.1 Linux. >>> >>> The Linux Kernel source contains an implementation for the Bestcomm API in >>> the form of a driver for ethernet (fec) and ATA.(situated in the >>> arch-powerpc/sysdev/bestcomm path) I tried to make use of it but i've run >>> into some problems. >>> >>> So i tried to include the API in a module to utilize its functionality but >>> no luck till now. >>> >>> Freescale supports the Bestcomm DMA API not on an OS level. So the problem >>> is adopting this API into a Linux environment, which distinguishes between >>> kernel space and user space while writing to the appropriate registers. >>> >>> Further information is very hard to find for such a common task as >>> starting a DMA transfer. >>> >>> Dave >>> >>> >>> >>> _______________________________________________ >>> Linuxppc-embedded mailing list >>> Linuxppc-embedded@ozlabs.org >>> https://ozlabs.org/mailman/listinfo/linuxppc-embedded >> >> _______________________________________________ >> Linuxppc-embedded mailing list >> Linuxppc-embedded@ozlabs.org >> https://ozlabs.org/mailman/listinfo/linuxppc-embedded >> > > >