From patchwork Tue Sep 12 10:44:23 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 9948999 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 565F260360 for ; Tue, 12 Sep 2017 10:46:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4DD4F28F11 for ; Tue, 12 Sep 2017 10:46:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 40EB528F13; Tue, 12 Sep 2017 10:46:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C83C828F11 for ; Tue, 12 Sep 2017 10:46:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Xd4TMiX+4h6SNMxKnOFaIIX/xdpIzqb9DkV/rMcTEek=; b=KgSu28MVbhCVVJ HsZ727aJZGI/6QcpBk0jd8U8jaWLrUCuh19FB5P4Fbb0iPwXejK+GVWkbnjGal83nZV5M3aCEGRYI cZte8zb9Yd/r/Tbund7o1EJKJgvH+tsDTF3jlv3qU3w/KAkl1/XyOliXMig6E5Klpx+luMen+aDAT 9BtJ6z+U/a5bA9B8orxtKrActUW2u6+QYxXILuHpUevBTvYNaDNZL+19J2OEUPmsnk7ik3SoaCDnX FeB+9QSFseRD8RXiIYjJQ1eQyNU0q0JIOIVLX7+GHTvidwUwNRy9q6FO316noEuOUqSt6eo/nCLpD xK3v8JajydBC+bxzmY/w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1driiE-0002l1-P4; Tue, 12 Sep 2017 10:46:38 +0000 Received: from lelnx193.ext.ti.com ([198.47.27.77]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1drigc-0000LW-K3 for linux-arm-kernel@lists.infradead.org; Tue, 12 Sep 2017 10:45:00 +0000 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by lelnx193.ext.ti.com (8.15.1/8.15.1) with ESMTP id v8CAiaGv018302; Tue, 12 Sep 2017 05:44:36 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1505213076; bh=d33L8/srOSJ5JMoAdteSs1oR1/iBm8YLFGRnXsFqoEc=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=hjOA7QXm6NxZn3IYbUVZoQOYyqWoPiar5UiszllMTX7zDKCwSainyrE8Vey7BoYeZ /0dFtHxD9lk3eV4n6vFDEOwiwNq10S59UTB6mOsLoCo4wosLemMlC4dbwSd+3PsSBk OhZbH4glImyXvqP6zSCiB3VXx0QFJNtEqTHwwHKo= Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id v8CAiaOT032364; Tue, 12 Sep 2017 05:44:36 -0500 Received: from DFLE110.ent.ti.com (10.64.6.31) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.845.34; Tue, 12 Sep 2017 05:44:35 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DFLE110.ent.ti.com (10.64.6.31) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.845.34 via Frontend Transport; Tue, 12 Sep 2017 05:44:35 -0500 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id v8CAiOu5007788; Tue, 12 Sep 2017 05:44:34 -0500 From: Peter Ujfalusi To: , Subject: [PATCH 4/5] dmaengine: edma: Implement device_get_max_len callback Date: Tue, 12 Sep 2017 13:44:23 +0300 Message-ID: <20170912104424.18495-5-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170912104424.18495-1-peter.ujfalusi@ti.com> References: <20170912104424.18495-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170912_034458_761841_92867899 X-CRM114-Status: UNSURE ( 8.25 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dmaengine@vger.kernel.org, t-kristo@ti.com, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP eDMA can support maximum of 65535 number of bursts in one transfer. The limitation is because the CCNT counter is 16bit unsigned. Signed-off-by: Peter Ujfalusi --- drivers/dma/edma.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 6970355abdc9..14c52574262c 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -900,6 +900,28 @@ static int edma_slave_config(struct dma_chan *chan, return 0; } +static u32 edma_get_max_len(struct dma_chan *chan, + enum dma_transfer_direction dir) +{ + struct edma_chan *echan = to_edma_chan(chan); + enum dma_slave_buswidth dev_width; + u32 burst; + + if (!is_slave_direction(dir)) + return 0; + + if (dir == DMA_DEV_TO_MEM) { + dev_width = echan->cfg.src_addr_width; + burst = echan->cfg.src_maxburst; + } else { + burst = echan->cfg.dst_maxburst; + dev_width = echan->cfg.dst_addr_width; + } + + /* CCNT: 16bit unsigned. Number of bursts */ + return dev_width * burst * (SZ_64K - 1); +} + static int edma_dma_pause(struct dma_chan *chan) { struct edma_chan *echan = to_edma_chan(chan); @@ -1850,6 +1872,7 @@ static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode) s_ddev->device_issue_pending = edma_issue_pending; s_ddev->device_tx_status = edma_tx_status; s_ddev->device_config = edma_slave_config; + s_ddev->device_get_max_len = edma_get_max_len; s_ddev->device_pause = edma_dma_pause; s_ddev->device_resume = edma_dma_resume; s_ddev->device_terminate_all = edma_terminate_all;