From patchwork Mon Jan 25 14:24:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 370759 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D49FEC193F2 for ; Tue, 26 Jan 2021 21:28:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B64AC2054F for ; Tue, 26 Jan 2021 21:28:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726995AbhAZEnp (ORCPT ); Mon, 25 Jan 2021 23:43:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729383AbhAYO3p (ORCPT ); Mon, 25 Jan 2021 09:29:45 -0500 X-Greylist: delayed 103 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 25 Jan 2021 06:29:05 PST Received: from leibniz.telenet-ops.be (leibniz.telenet-ops.be [IPv6:2a02:1800:110:4::f00:d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B8B8C0617AB for ; Mon, 25 Jan 2021 06:29:04 -0800 (PST) Received: from xavier.telenet-ops.be (xavier.telenet-ops.be [IPv6:2a02:1800:120:4::f00:14]) by leibniz.telenet-ops.be (Postfix) with ESMTPS id 4DPXG800L9zMsJpk for ; Mon, 25 Jan 2021 15:25:35 +0100 (CET) Received: from ramsan.of.borg ([84.195.186.194]) by xavier.telenet-ops.be with bizsmtp id M2QZ2400R4C55Sk012QZRB; Mon, 25 Jan 2021 15:24:34 +0100 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1l42nB-000eiX-8K; Mon, 25 Jan 2021 15:24:33 +0100 Received: from geert by rox.of.borg with local (Exim 4.93) (envelope-from ) id 1l42nA-004P5J-8z; Mon, 25 Jan 2021 15:24:32 +0100 From: Geert Uytterhoeven To: Vinod Koul Cc: Rob Herring , Dan Williams , Yoshihiro Shimoda , Wolfram Sang , Laurent Pinchart , dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v2 4/4] dmaengine: rcar-dmac: Add support for R-Car V3U Date: Mon, 25 Jan 2021 15:24:31 +0100 Message-Id: <20210125142431.1049668-5-geert+renesas@glider.be> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210125142431.1049668-1-geert+renesas@glider.be> References: <20210125142431.1049668-1-geert+renesas@glider.be> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The DMACs (both SYS-DMAC and RT-DMAC) on R-Car V3U differ slightly from the DMACs on R-Car Gen2 and other R-Car Gen3 SoCs: 1. The per-channel registers are located in a second register block. Add support for mapping the second block, using the appropriate offsets and stride. 2. The common Channel Clear Register (DMACHCLR) was replaced by a per-channel register. Update rcar_dmac_chan_clear{,_all}() to handle this. As rcar_dmac_init() needs to clear the status before the individual channels are probed, channel index and base address initialization are moved forward. Inspired by a patch in the BSP by Phong Hoang . Signed-off-by: Geert Uytterhoeven Tested-by: Wolfram Sang --- v2: - Use two separate named regions instead of an iomem[] array, - Drop rcar_dmac_of_data.chan_reg_block, check for !rcar_dmac_of_data.chan_offset_base instead, - Precalculate chan_base in rcar_dmac_probe(). --- drivers/dma/sh/rcar-dmac.c | 74 ++++++++++++++++++++++++++++---------- 1 file changed, 55 insertions(+), 19 deletions(-) diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index 7a0f802c61e5152d..d9589eea98083215 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -189,7 +189,8 @@ struct rcar_dmac_chan { * struct rcar_dmac - R-Car Gen2 DMA Controller * @engine: base DMA engine object * @dev: the hardware device - * @iomem: remapped I/O memory base + * @dmac_base: remapped base register block + * @chan_base: remapped channel register block (optional) * @n_channels: number of available channels * @channels: array of DMAC channels * @channels_mask: bitfield of which DMA channels are managed by this driver @@ -198,7 +199,8 @@ struct rcar_dmac_chan { struct rcar_dmac { struct dma_device engine; struct device *dev; - void __iomem *iomem; + void __iomem *dmac_base; + void __iomem *chan_base; unsigned int n_channels; struct rcar_dmac_chan *channels; @@ -234,7 +236,7 @@ struct rcar_dmac_of_data { #define RCAR_DMAOR_PRI_ROUND_ROBIN (3 << 8) #define RCAR_DMAOR_AE (1 << 2) #define RCAR_DMAOR_DME (1 << 0) -#define RCAR_DMACHCLR 0x0080 +#define RCAR_DMACHCLR 0x0080 /* Not on R-Car V3U */ #define RCAR_DMADPSEC 0x00a0 #define RCAR_DMASAR 0x0000 @@ -297,6 +299,9 @@ struct rcar_dmac_of_data { #define RCAR_DMAFIXDAR 0x0014 #define RCAR_DMAFIXDPBASE 0x0060 +/* For R-Car V3U */ +#define RCAR_V3U_DMACHCLR 0x0100 + /* Hardcode the MEMCPY transfer size to 4 bytes. */ #define RCAR_DMAC_MEMCPY_XFER_SIZE 4 @@ -307,17 +312,17 @@ struct rcar_dmac_of_data { static void rcar_dmac_write(struct rcar_dmac *dmac, u32 reg, u32 data) { if (reg == RCAR_DMAOR) - writew(data, dmac->iomem + reg); + writew(data, dmac->dmac_base + reg); else - writel(data, dmac->iomem + reg); + writel(data, dmac->dmac_base + reg); } static u32 rcar_dmac_read(struct rcar_dmac *dmac, u32 reg) { if (reg == RCAR_DMAOR) - return readw(dmac->iomem + reg); + return readw(dmac->dmac_base + reg); else - return readl(dmac->iomem + reg); + return readl(dmac->dmac_base + reg); } static u32 rcar_dmac_chan_read(struct rcar_dmac_chan *chan, u32 reg) @@ -339,12 +344,23 @@ static void rcar_dmac_chan_write(struct rcar_dmac_chan *chan, u32 reg, u32 data) static void rcar_dmac_chan_clear(struct rcar_dmac *dmac, struct rcar_dmac_chan *chan) { - rcar_dmac_write(dmac, RCAR_DMACHCLR, BIT(chan->index)); + if (dmac->chan_base) + rcar_dmac_chan_write(chan, RCAR_V3U_DMACHCLR, 1); + else + rcar_dmac_write(dmac, RCAR_DMACHCLR, BIT(chan->index)); } static void rcar_dmac_chan_clear_all(struct rcar_dmac *dmac) { - rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask); + struct rcar_dmac_chan *chan; + unsigned int i; + + if (dmac->chan_base) { + for_each_rcar_dmac_chan(i, chan, dmac) + rcar_dmac_chan_write(chan, RCAR_V3U_DMACHCLR, 1); + } else { + rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask); + } } /* ----------------------------------------------------------------------------- @@ -1744,7 +1760,6 @@ static const struct dev_pm_ops rcar_dmac_pm = { static int rcar_dmac_chan_probe(struct rcar_dmac *dmac, struct rcar_dmac_chan *rchan, - const struct rcar_dmac_of_data *data, unsigned int index) { struct platform_device *pdev = to_platform_device(dmac->dev); @@ -1753,9 +1768,6 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac, char *irqname; int ret; - rchan->index = index; - rchan->iomem = dmac->iomem + data->chan_offset_base + - data->chan_offset_stride * index; rchan->mid_rid = -EINVAL; spin_lock_init(&rchan->lock); @@ -1842,6 +1854,7 @@ static int rcar_dmac_probe(struct platform_device *pdev) const struct rcar_dmac_of_data *data; struct rcar_dmac_chan *chan; struct dma_device *engine; + void __iomem *chan_base; struct rcar_dmac *dmac; unsigned int i; int ret; @@ -1880,9 +1893,24 @@ static int rcar_dmac_probe(struct platform_device *pdev) return -ENOMEM; /* Request resources. */ - dmac->iomem = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(dmac->iomem)) - return PTR_ERR(dmac->iomem); + dmac->dmac_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dmac->dmac_base)) + return PTR_ERR(dmac->dmac_base); + + if (!data->chan_offset_base) { + dmac->chan_base = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(dmac->chan_base)) + return PTR_ERR(dmac->chan_base); + + chan_base = dmac->chan_base; + } else { + chan_base = dmac->dmac_base + data->chan_offset_base; + } + + for_each_rcar_dmac_chan(i, chan, dmac) { + chan->index = i; + chan->iomem = chan_base + i * data->chan_offset_stride; + } /* Enable runtime PM and initialize the device. */ pm_runtime_enable(&pdev->dev); @@ -1929,7 +1957,7 @@ static int rcar_dmac_probe(struct platform_device *pdev) INIT_LIST_HEAD(&engine->channels); for_each_rcar_dmac_chan(i, chan, dmac) { - ret = rcar_dmac_chan_probe(dmac, chan, data, i); + ret = rcar_dmac_chan_probe(dmac, chan, i); if (ret < 0) goto error; } @@ -1977,14 +2005,22 @@ static void rcar_dmac_shutdown(struct platform_device *pdev) } static const struct rcar_dmac_of_data rcar_dmac_data = { - .chan_offset_base = 0x8000, - .chan_offset_stride = 0x80, + .chan_offset_base = 0x8000, + .chan_offset_stride = 0x80, +}; + +static const struct rcar_dmac_of_data rcar_v3u_dmac_data = { + .chan_offset_base = 0x0, + .chan_offset_stride = 0x1000, }; static const struct of_device_id rcar_dmac_of_ids[] = { { .compatible = "renesas,rcar-dmac", .data = &rcar_dmac_data, + }, { + .compatible = "renesas,dmac-r8a779a0", + .data = &rcar_v3u_dmac_data, }, { /* Sentinel */ } };