From patchwork Fri Mar 24 09:49:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13186614 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 95B2AC76196 for ; Fri, 24 Mar 2023 09:50:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231273AbjCXJuO (ORCPT ); Fri, 24 Mar 2023 05:50:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230004AbjCXJuL (ORCPT ); Fri, 24 Mar 2023 05:50:11 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 41A968A5F; Fri, 24 Mar 2023 02:50:10 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.98,287,1673881200"; d="scan'208";a="153658955" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 24 Mar 2023 18:50:09 +0900 Received: from localhost.localdomain (unknown [10.226.93.228]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id ECF6E401AEB2; Fri, 24 Mar 2023 18:50:07 +0900 (JST) From: Biju Das To: Vinod Koul Cc: Biju Das , Lad Prabhakar , Geert Uytterhoeven , dmaengine@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH 3/3] dmaengine: sh: rz-dmac: Add device_pause() callback Date: Fri, 24 Mar 2023 09:49:57 +0000 Message-Id: <20230324094957.115071-4-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230324094957.115071-1-biju.das.jz@bp.renesas.com> References: <20230324094957.115071-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The device_pause() callback is needed for serial DMA (RZ/G2L SCIFA). Add support for device_pause() callback. Based on a patch in the BSP by Long Luu Signed-off-by: Biju Das --- drivers/dma/sh/rz-dmac.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c index 3625925d9f9f..a0cfb8f75534 100644 --- a/drivers/dma/sh/rz-dmac.c +++ b/drivers/dma/sh/rz-dmac.c @@ -822,6 +822,25 @@ 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; +} + /* * ----------------------------------------------------------------------------- * IRQ handling @@ -1111,6 +1130,7 @@ 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->copy_align = DMAENGINE_ALIGN_1_BYTE; dma_set_max_seg_size(engine->dev, U32_MAX);