From patchwork Fri Feb 25 11:23:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12760134 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 0EFE6C433FE for ; Fri, 25 Feb 2022 11:24:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240055AbiBYLYu (ORCPT ); Fri, 25 Feb 2022 06:24:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46356 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240050AbiBYLYs (ORCPT ); Fri, 25 Feb 2022 06:24:48 -0500 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFECB22320F; Fri, 25 Feb 2022 03:24:15 -0800 (PST) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 033B7FF806; Fri, 25 Feb 2022 11:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1645788254; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4alF5GmAT5Za2RaFUiWrz2PPXf/YVS2l/t9CGG8/NLI=; b=cBmMI2YL+da4M/dsi5R7v5T2prHbF4PMS5rCueZCyfV2c3k/pKiDRtaf232LbyhTSdvgqQ RTTyRerRwMZ+1ecYgqSn6Q0o1IWg5YqmzkRbpch2IYdGbuwOpLQcxcPva2PFIOyjefdhoc yzNAs/bp+pBxQyaQrZnQI/VyRJD/qojC+F+VnboPYScDiDamYWlYvA60Qd/+y7VlPxA6xh DOcUNe8MQX2gtg6MsrP9d9koQQYKUhyWjHYGiB3F4RvLEANze3Ph/9Oohwij7x/7NO45c2 5NgSOJ94XFCcI535a0ttwGh7BlK3QadZov9KV2brPSLWyBPknu60mz3ePplRKg== From: Miquel Raynal To: Vinod Koul , dmaengine@vger.kernel.org Cc: Rob Herring , devicetree@vger.kernel.org, Stephen Boyd , Michael Turquette , linux-clk@vger.kernel.org, Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , linux-renesas-soc@vger.kernel.org, Magnus Damm , Gareth Williams , Phil Edworthy , Geert Uytterhoeven , Thomas Petazzoni , Miquel Raynal Subject: [PATCH v3 4/7] dma: dmamux: Introduce RZN1 DMA router support Date: Fri, 25 Feb 2022 12:23:59 +0100 Message-Id: <20220225112403.505562-5-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220225112403.505562-1-miquel.raynal@bootlin.com> References: <20220225112403.505562-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The Renesas RZN1 DMA IP is a based on a DW core, with eg. an additional dmamux register located in the system control area which can take up to 32 requests (16 per DMA controller). Each DMA channel can be wired to two different peripherals. We need two additional information from the 'dmas' property: the channel (bit in the dmamux register) that must be accessed and the value of the mux for this channel. Signed-off-by: Miquel Raynal --- drivers/dma/dw/Kconfig | 8 ++ drivers/dma/dw/Makefile | 2 + drivers/dma/dw/rzn1-dmamux.c | 152 +++++++++++++++++++++++++++++++++++ 3 files changed, 162 insertions(+) create mode 100644 drivers/dma/dw/rzn1-dmamux.c diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig index db25f9b7778c..dd53d4a9fa92 100644 --- a/drivers/dma/dw/Kconfig +++ b/drivers/dma/dw/Kconfig @@ -16,6 +16,14 @@ config DW_DMAC Support the Synopsys DesignWare AHB DMA controller. This can be integrated in chips such as the Intel Cherrytrail. +config RZN1_DMAMUX + tristate "Renesas RZ/N1 DMAMUX driver" + depends on DW_DMAC + help + Support the Renesas RZ/N1 DMAMUX which is located in front of + the Synopsys DesignWare AHB DMA controller located on Renesas + SoCs. + config DW_DMAC_PCI tristate "Synopsys DesignWare AHB DMA PCI driver" depends on PCI diff --git a/drivers/dma/dw/Makefile b/drivers/dma/dw/Makefile index a6f358ad8591..8025f75e589c 100644 --- a/drivers/dma/dw/Makefile +++ b/drivers/dma/dw/Makefile @@ -7,5 +7,7 @@ obj-$(CONFIG_DW_DMAC) += dw_dmac.o dw_dmac-y := platform.o dw_dmac-$(CONFIG_OF) += of.o +obj-$(CONFIG_RZN1_DMAMUX) += rzn1-dmamux.o + obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o dw_dmac_pci-y := pci.o diff --git a/drivers/dma/dw/rzn1-dmamux.c b/drivers/dma/dw/rzn1-dmamux.c new file mode 100644 index 000000000000..bc4e2e7c3d18 --- /dev/null +++ b/drivers/dma/dw/rzn1-dmamux.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Schneider-Electric + * Author: Miquel Raynal + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RZN1_DMAMUX_LINES 64 +#define RZN1_DMAMUX_SPLIT 16 + +struct rzn1_dmamux_data { + struct dma_router dmarouter; + u32 used_chans; + struct mutex lock; +}; + +struct rzn1_dmamux_map { + unsigned int req_idx; +}; + +static void rzn1_dmamux_free(struct device *dev, void *route_data) +{ + struct rzn1_dmamux_data *dmamux = dev_get_drvdata(dev); + struct rzn1_dmamux_map *map = route_data; + + dev_dbg(dev, "Unmapping DMAMUX request %u\n", map->req_idx); + + mutex_lock(&dmamux->lock); + dmamux->used_chans &= ~BIT(map->req_idx); + mutex_unlock(&dmamux->lock); + + kfree(map); +} + +static void *rzn1_dmamux_route_allocate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct platform_device *pdev = of_find_device_by_node(ofdma->of_node); + struct rzn1_dmamux_data *dmamux = platform_get_drvdata(pdev); + struct rzn1_dmamux_map *map; + unsigned int dmac_idx, chan, val; + u32 mask; + int ret; + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return ERR_PTR(-ENOMEM); + + if (dma_spec->args_count != 6) + return ERR_PTR(-EINVAL); + + chan = dma_spec->args[0]; + map->req_idx = dma_spec->args[4]; + val = dma_spec->args[5]; + dma_spec->args_count -= 2; + + if (chan >= RZN1_DMAMUX_SPLIT) { + dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan); + return ERR_PTR(-EINVAL); + } + + if (map->req_idx >= RZN1_DMAMUX_LINES || + (map->req_idx % RZN1_DMAMUX_SPLIT) != chan) { + dev_err(&pdev->dev, "Invalid MUX request line: %u\n", map->req_idx); + return ERR_PTR(-EINVAL); + } + + dmac_idx = map->req_idx < RZN1_DMAMUX_SPLIT ? 0 : 1; + dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", dmac_idx); + if (!dma_spec->np) { + dev_err(&pdev->dev, "Can't get DMA master\n"); + return ERR_PTR(-EINVAL); + } + + dev_dbg(&pdev->dev, "Mapping DMAMUX request %u to DMAC%u request %u\n", + map->req_idx, dmac_idx, chan); + + mask = BIT(map->req_idx); + mutex_lock(&dmamux->lock); + dmamux->used_chans |= mask; + ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0); + mutex_unlock(&dmamux->lock); + if (ret) { + rzn1_dmamux_free(&pdev->dev, map); + return ERR_PTR(ret); + } + + return map; +} + +static const struct of_device_id rzn1_dmac_match[] __maybe_unused = { + { .compatible = "renesas,rzn1-dma" }, + {}, +}; + +static int rzn1_dmamux_probe(struct platform_device *pdev) +{ + struct device_node *mux_node = pdev->dev.of_node; + const struct of_device_id *match; + struct device_node *dmac_node; + struct rzn1_dmamux_data *dmamux; + + dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL); + if (!dmamux) + return -ENOMEM; + + mutex_init(&dmamux->lock); + + dmac_node = of_parse_phandle(mux_node, "dma-masters", 0); + if (!dmac_node) + return dev_err_probe(&pdev->dev, -ENODEV, "Can't get DMA master node\n"); + + match = of_match_node(rzn1_dmac_match, dmac_node); + of_node_put(dmac_node); + if (!match) + return dev_err_probe(&pdev->dev, -EINVAL, "DMA master is not supported\n"); + + dmamux->dmarouter.dev = &pdev->dev; + dmamux->dmarouter.route_free = rzn1_dmamux_free; + + platform_set_drvdata(pdev, dmamux); + + return of_dma_router_register(mux_node, rzn1_dmamux_route_allocate, + &dmamux->dmarouter); +} + +static const struct of_device_id rzn1_dmamux_match[] = { + { .compatible = "renesas,rzn1-dmamux" }, + {}, +}; + +static struct platform_driver rzn1_dmamux_driver = { + .driver = { + .name = "renesas,rzn1-dmamux", + .of_match_table = rzn1_dmamux_match, + }, + .probe = rzn1_dmamux_probe, +}; +module_platform_driver(rzn1_dmamux_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Miquel Raynal