From patchwork Fri Sep 28 13:01:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierre Yves MORDRET X-Patchwork-Id: 10619909 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 30BE9174A for ; Fri, 28 Sep 2018 13:03:26 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 208C928481 for ; Fri, 28 Sep 2018 13:03:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 142952853C; Fri, 28 Sep 2018 13:03:26 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A1CC128481 for ; Fri, 28 Sep 2018 13:03:25 +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: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:In-Reply-To:References: List-Owner; bh=jepqWjfyHsqEoc7YAZ+XvQZPW04F27dU2aYxIFrfeB8=; b=q6eatPCoH7fa2q L+dwiyeUBYhP3am9KO0Qj6cS4pkiVHSMqKeoevf0siXqudZLR098P5QIcI45yVRNju410MllwCWMZ /j0QK53NBZ0gUCnQzg3yyO53iBy5tmN71esluGjRvdwy/wPm5pyUcmJ4A8DpBjWngBaDxEKkBQRSg Z5jegDAZVIlFL9jTgU9XOgYar08hPIuES8sdJaWDpnVNJAXjrgvdKaraGU9YDPnNveEBYLgzxWtaJ QrIMYbIqlwk11GVpMQew9/73END1CVEchgC/kPoeVtuNyyN/2qjm37FEEXYQGVe4xW1amqlk5z22x 3OBY5nvHKTnvgMHRe1oA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1g5sQG-0006cn-UO; Fri, 28 Sep 2018 13:03:08 +0000 Received: from mx07-00178001.pphosted.com ([62.209.51.94]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1g5sPV-0006GQ-UZ for linux-arm-kernel@lists.infradead.org; Fri, 28 Sep 2018 13:02:24 +0000 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id w8SCwsPN019782; Fri, 28 Sep 2018 15:02:02 +0200 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2mrj4mkby3-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 28 Sep 2018 15:02:02 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C8C0138; Fri, 28 Sep 2018 13:02:01 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node2.st.com [10.75.127.14]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id A531D4E6F; Fri, 28 Sep 2018 13:02:01 +0000 (GMT) Received: from localhost (10.75.127.50) by SFHDAG5NODE2.st.com (10.75.127.14) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 28 Sep 2018 15:02:00 +0200 From: Pierre-Yves MORDRET To: Vinod Koul , Rob Herring , Mark Rutland , Alexandre Torgue , Maxime Coquelin , Dan Williams , , , , Subject: [PATCH v3 0/7] Add-DMA-MDMA-chaining-support Date: Fri, 28 Sep 2018 15:01:48 +0200 Message-ID: <1538139715-24406-1-git-send-email-pierre-yves.mordret@st.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.75.127.50] X-ClientProxiedBy: SFHDAG2NODE3.st.com (10.75.127.6) To SFHDAG5NODE2.st.com (10.75.127.14) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-09-28_05:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180928_060222_316574_AC339911 X-CRM114-Status: GOOD ( 11.41 ) 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: Pierre-Yves MORDRET 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 This serie adds support for M2M transfer triggered by STM32 DMA in order to transfer data from/to SRAM to/from DDR. Normally, this mode should not be needed as transferring data from/to DDR is supported by the STM32 DMA. However, the STM32 DMA don't have the ability to generate burst transfer on the DDR as it only embeds only a 4-word FIFO although the minimal burst length on the DDR is 8 words. Due to this constraint, the STM32 DMA transfers data from/to DDR in a single way and could lead to pollute the DDR. To avoid this, we have to use SRAM for all transfers where STM32 DMA is involved. An Hw design has been specially put in place to allow this chaining where DMA interrupt is connected on GIC and MDMA request line as well. This grants the possibility to trigger an MDMA transfer from the completion of DMA. At the same time MDMA has the ability to acknowlege DMA. The aim is to have an self refreching mechanism to transfer from/to device to/from DDR with minimal sw support. For instance the DMA is set in cyclic double buffering to feed SRAM and MDMA transfer to DDR thanks to LLI. --- Version history: v3: * Solve KBuild warnings v2: * Rework binding content v1: * Initial --- Pierre-Yves MORDRET (3): dt-bindings: stm32-dma: Add DMA/MDMA chaining support bindings dt-bindings: stm32-dmamux: Add one cell to support DMA/MDMA chain dt-bindings: stm32-mdma: Add DMA/MDMA chaining support bindings dmaengine: stm32-dma: Add DMA/MDMA chaining support dmaengine: stm32-mdma: Add DMA/MDMA chaining support dmaengine: stm32-dma: enable descriptor_reuse dmaengine: stm32-mdma: enable descriptor_reuse .../devicetree/bindings/dma/stm32-dma.txt | 27 +- .../devicetree/bindings/dma/stm32-dmamux.txt | 6 +- .../devicetree/bindings/dma/stm32-mdma.txt | 12 +- drivers/dma/stm32-dma.c | 903 ++++++++++++++++++--- drivers/dma/stm32-mdma.c | 133 ++- 5 files changed, 949 insertions(+), 132 deletions(-)