From patchwork Wed Apr 5 14:10:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13201811 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD8B1C761A6 for ; Wed, 5 Apr 2023 14:11:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238529AbjDEOLd (ORCPT ); Wed, 5 Apr 2023 10:11:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237448AbjDEOLM (ORCPT ); Wed, 5 Apr 2023 10:11:12 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id ED57765BF; Wed, 5 Apr 2023 07:10:41 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.98,319,1673881200"; d="scan'208";a="158393799" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 05 Apr 2023 23:10:41 +0900 Received: from localhost.localdomain (unknown [10.226.93.81]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id C821B42DB43A; Wed, 5 Apr 2023 23:10:39 +0900 (JST) From: Biju Das To: Vinod Koul Cc: Biju Das , Geert Uytterhoeven , Lad Prabhakar , dmaengine@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 3/5] dmaengine: sh: rz-dmac: Add device_{pause,resume}() callbacks Date: Wed, 5 Apr 2023 15:10:37 +0100 Message-Id: <20230405141037.201999-1-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org Add support for device_{pause, resume}() callbacks as it is needed for RZ/G2L SCIFA driver. Based on a patch in the BSP by Long Luu Signed-off-by: Biju Das --- v1->v2: * Added resume callback(). * Updated commit description. --- drivers/dma/sh/rz-dmac.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c index aaaae1c090ad..3ef516aee4fc 100644 --- a/drivers/dma/sh/rz-dmac.c +++ b/drivers/dma/sh/rz-dmac.c @@ -817,6 +817,35 @@ static enum dma_status rz_dmac_tx_status(struct dma_chan *chan, return status; } +static int rz_dmac_device_pause(struct dma_chan *chan) +{ + struct rz_dmac_chan *channel = to_rz_dmac_chan(chan); + struct rz_dmac *dmac = to_rz_dmac(chan->device); + unsigned int i; + u32 chstat; + + for (i = 0; i < 1024; i++) { + chstat = rz_dmac_ch_readl(channel, CHSTAT, 1); + if (!(chstat & CHSTAT_EN)) + break; + udelay(1); + } + + rz_dmac_set_dmars_register(dmac, channel->index, 0); + + return 0; +} + +static int rz_dmac_device_resume(struct dma_chan *chan) +{ + struct rz_dmac_chan *channel = to_rz_dmac_chan(chan); + struct rz_dmac *dmac = to_rz_dmac(chan->device); + + rz_dmac_set_dmars_register(dmac, channel->index, channel->mid_rid); + + return 0; +} + /* * ----------------------------------------------------------------------------- * IRQ handling @@ -1106,6 +1135,8 @@ static int rz_dmac_probe(struct platform_device *pdev) engine->device_terminate_all = rz_dmac_terminate_all; engine->device_issue_pending = rz_dmac_issue_pending; engine->device_synchronize = rz_dmac_device_synchronize; + engine->device_pause = rz_dmac_device_pause; + engine->device_resume = rz_dmac_device_resume; engine->copy_align = DMAENGINE_ALIGN_1_BYTE; dma_set_max_seg_size(engine->dev, U32_MAX);