From patchwork Thu Jul 6 12:20:22 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierre Yves MORDRET X-Patchwork-Id: 9828169 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 BADBA60361 for ; Thu, 6 Jul 2017 12:22:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AB58C28614 for ; Thu, 6 Jul 2017 12:22:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9FCFC28639; Thu, 6 Jul 2017 12:22:28 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6127A28632 for ; Thu, 6 Jul 2017 12:22:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752854AbdGFMVi (ORCPT ); Thu, 6 Jul 2017 08:21:38 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:3820 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751952AbdGFMVe (ORCPT ); Thu, 6 Jul 2017 08:21:34 -0400 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 v66CJWpE000844; Thu, 6 Jul 2017 14:20:36 +0200 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-.pphosted.com with ESMTP id 2bhmh288e3-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 06 Jul 2017 14:20:36 +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 4069B3F; Thu, 6 Jul 2017 12:20:36 +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 17B36264F; Thu, 6 Jul 2017 12:20:36 +0000 (GMT) Received: from localhost (10.75.127.44) by SFHDAG5NODE2.st.com (10.75.127.14) with Microsoft SMTP Server (TLS) id 15.0.1178.4; Thu, 6 Jul 2017 14:20:35 +0200 From: Pierre-Yves MORDRET To: Vinod Koul , Rob Herring , Mark Rutland , Maxime Coquelin , Alexandre Torgue , Russell King , Dan Williams , "M'boumba Cedric Madianga" , Fabrice GASNIER , Herbert Xu , Fabien DESSENNE , Amelie Delaunay , Pierre-Yves MORDRET , , , , Subject: [PATCH v3 4/5] dmaengine: stm32-dma: Add support for STM32 DMAMUX Date: Thu, 6 Jul 2017 14:20:22 +0200 Message-ID: <1499343623-5964-5-git-send-email-pierre-yves.mordret@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1499343623-5964-1-git-send-email-pierre-yves.mordret@st.com> References: <1499343623-5964-1-git-send-email-pierre-yves.mordret@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG7NODE3.st.com (10.75.127.21) To SFHDAG5NODE2.st.com (10.75.127.14) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-07-06_05:, , signatures=0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds support for STM32 DMAMUX. When the STM32 DMA controller is behind a STM32 DMAMUX the request line number has not to be handled by DMA but DMAMUX. Signed-off-by: M'boumba Cedric Madianga Signed-off-by: Pierre-Yves MORDRET --- Version history: V3: * None v2: * Use DMAMUX Configuration API's * DMAXMUX(if used) provides ChannelID --- --- drivers/dma/stm32-dma.c | 44 +++++++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 13 deletions(-) diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index 786fc8f..a9e5884 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -179,6 +180,7 @@ struct stm32_dma_device { struct clk *clk; struct reset_control *rst; bool mem2mem; + bool dmamux; struct stm32_dma_chan chan[STM32_DMA_MAX_CHANNELS]; }; @@ -272,12 +274,18 @@ static int stm32_dma_slave_config(struct dma_chan *c, struct dma_slave_config *config) { struct stm32_dma_chan *chan = to_stm32_dma_chan(c); + int ret = 0; memcpy(&chan->dma_sconfig, config, sizeof(*config)); - chan->config_init = true; + if (c->router) + ret = stm32_dmamux_set_config(c->router->dev, c->route_data, + c->chan_id); - return 0; + if (!ret) + chan->config_init = true; + + return ret; } static u32 stm32_dma_irq_status(struct stm32_dma_chan *chan) @@ -998,18 +1006,26 @@ static struct dma_chan *stm32_dma_of_xlate(struct of_phandle_args *dma_spec, cfg.stream_config = dma_spec->args[2]; cfg.threshold = dma_spec->args[3]; - if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) || - (cfg.request_line >= STM32_DMA_MAX_REQUEST_ID)) { - dev_err(dev, "Bad channel and/or request id\n"); - return NULL; - } - - chan = &dmadev->chan[cfg.channel_id]; + if (dmadev->dmamux) { + c = dma_get_any_slave_channel(&dmadev->ddev); + if (!c) { + dev_err(dev, "No more channel avalaible\n"); + return NULL; + } + chan = &dmadev->chan[c->chan_id]; + } else { + if ((cfg.channel_id >= STM32_DMA_MAX_CHANNELS) || + (cfg.request_line >= STM32_DMA_MAX_REQUEST_ID)) { + dev_err(dev, "Bad channel and/or request id\n"); + return NULL; + } - c = dma_get_slave_channel(&chan->vchan.chan); - if (!c) { - dev_err(dev, "No more channels available\n"); - return NULL; + chan = &dmadev->chan[cfg.channel_id]; + c = dma_get_slave_channel(&chan->vchan.chan); + if (!c) { + dev_err(dev, "No more channel avalaible\n"); + return NULL; + } } stm32_dma_set_config(chan, &cfg); @@ -1058,6 +1074,8 @@ static int stm32_dma_probe(struct platform_device *pdev) dmadev->mem2mem = of_property_read_bool(pdev->dev.of_node, "st,mem2mem"); + dmadev->dmamux = of_property_read_bool(pdev->dev.of_node, "st,dmamux"); + dmadev->rst = devm_reset_control_get(&pdev->dev, NULL); if (!IS_ERR(dmadev->rst)) { reset_control_assert(dmadev->rst);