From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759573Ab2CMTej (ORCPT ); Tue, 13 Mar 2012 15:34:39 -0400 Received: from wolverine02.qualcomm.com ([199.106.114.251]:9474 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759270Ab2CMTeh (ORCPT ); Tue, 13 Mar 2012 15:34:37 -0400 X-IronPort-AV: E=McAfee;i="5400,1158,6648"; a="169830250" Date: Tue, 13 Mar 2012 12:34:32 -0700 From: David Brown To: Shantanu Gupta Cc: Daniel Walker , Ravi Kumar V , Vinod Koul , Dan Williams , Bryan Huntsman , Russell King , linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org Subject: Re: [PATCH v3 2/2] DMAEngine: Add DMAEngine driver based on old MSM DMA APIs Message-ID: <20120313193432.GA13046@codeaurora.org> References: <1331548364-27845-1-git-send-email-kumarrav@codeaurora.org> <20120312201421.GA3459@fifo99.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 13, 2012 at 04:27:37PM +0530, Shantanu Gupta wrote: > Any info available(publicly) on so as to what all chipsets have this capability > ? The ADM hardware is in every currently available MSM that can run Linux. It is being phased out, to be replaced by a new DMA system (SPS/BAM). Fortunately, there are some chips (MSM8960) that have both ADM and SPS/BAM so there should be time to get those drivers in. At least as my memory serves me: 7201 - ADM 8250 - ADM 8660 - 2 ADMs, SPS/BAM 8960 - 1 ADM, SPS/BAM The ADM is mostly a regular DMA-type device. Each channel can be associated with a rate-control channel, which is needed for some devices. It also has a mode called "box mode", which works kind of like a self-repeating scatter list. This mode is needed for some of the peripherals also on the MSM. David > On Tue, Mar 13, 2012 at 1:44 AM, Daniel Walker wrote: > > On Mon, Mar 12, 2012 at 04:02:44PM +0530, Ravi Kumar V wrote: > > Add DMAEngine based driver using the old MSM DMA APIs internally. > > What do you mean by this? > > > The benefit of this approach is that not all the drivers > > have to get converted to DMAEngine APIs simultaneosly while > > both the drivers can stay enabled in the kernel. The client > > drivers using the old MSM APIs directly can now convert to > > DMAEngine one by one. > > Which drivers? > > Daniel > -- > To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.