From patchwork Thu Apr 21 08:51:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12821344 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 3AAF5C433EF for ; Thu, 21 Apr 2022 08:51:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1386983AbiDUIyV (ORCPT ); Thu, 21 Apr 2022 04:54:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1386977AbiDUIyV (ORCPT ); Thu, 21 Apr 2022 04:54:21 -0400 Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [IPv6:2001:4b98:dc4:8::223]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 950B3DF49; Thu, 21 Apr 2022 01:51:31 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id A123D60016; Thu, 21 Apr 2022 08:51:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1650531090; 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-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xXtdpyXt+YjtRwGAXtAk7QcQIpXJNhn4MwmiuZj8dMk=; b=CMJORgNGRsHLEgECdsxt51fFxFVU9dOonj0/UELtLzzwqx6tmjQVnNcwCyOziP86EiCCGu heqg/JRbl/II01304CAyaMLHIDfOzjD6QsqGY3E5SnmwINK4T3qANanVLJEs7BZxL+M0v0 bOPA6SNBxzvMDKGLfJTi0RozG51ElN8er1BzYtikcpsHuedT5tEsE98vyyCdpehWUnecB6 wyolbtl7Utpb9heFqchj/xaYb7XnMuVpW7r7w4QbgFQeDz5GO4OwW6h8HJmImshCRm3/VM Xf9Jz6fro0rG4c7j/MOHwYJhv6s/jfHOZUJGaAOYQpODq0fqEipx4ENsQl260A== From: Miquel Raynal To: Magnus Damm , Gareth Williams , Phil Edworthy , Geert Uytterhoeven , Vinod Koul Cc: Miquel Raynal , linux-renesas-soc@vger.kernel.org, dmaengine@vger.kernel.org, Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger , Stephen Boyd , Michael Turquette , linux-clk@vger.kernel.org, Viresh Kumar , Andy Shevchenko , Ilpo Jarvinen , Rob Herring , devicetree@vger.kernel.org Subject: [PATCH v11 5/9] dmaengine: dw: dmamux: Introduce RZN1 DMA router support Date: Thu, 21 Apr 2022 10:51:08 +0200 Message-Id: <20220421085112.78858-6-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220421085112.78858-1-miquel.raynal@bootlin.com> References: <20220421085112.78858-1-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 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 Reviewed-by: Andy Shevchenko Reviewed-by: Ilpo Järvinen --- drivers/dma/dw/Kconfig | 9 ++ drivers/dma/dw/Makefile | 2 + drivers/dma/dw/rzn1-dmamux.c | 155 +++++++++++++++++++++++++++++++++++ 3 files changed, 166 insertions(+) create mode 100644 drivers/dma/dw/rzn1-dmamux.c diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig index db25f9b7778c..a9828ddd6d06 100644 --- a/drivers/dma/dw/Kconfig +++ b/drivers/dma/dw/Kconfig @@ -16,6 +16,15 @@ 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 + depends on ARCH_RZN1 || COMPILE_TEST + 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..e1796015f213 100644 --- a/drivers/dma/dw/Makefile +++ b/drivers/dma/dw/Makefile @@ -9,3 +9,5 @@ dw_dmac-$(CONFIG_OF) += of.o obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o dw_dmac_pci-y := pci.o + +obj-$(CONFIG_RZN1_DMAMUX) += rzn1-dmamux.o diff --git a/drivers/dma/dw/rzn1-dmamux.c b/drivers/dma/dw/rzn1-dmamux.c new file mode 100644 index 000000000000..11d254e450b0 --- /dev/null +++ b/drivers/dma/dw/rzn1-dmamux.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Schneider-Electric + * Author: Miquel Raynal + */ +#include +#include +#include +#include +#include +#include + +#define RNZ1_DMAMUX_NCELLS 6 +#define RZN1_DMAMUX_MAX_LINES 64 +#define RZN1_DMAMUX_LINES_PER_CTLR 16 + +struct rzn1_dmamux_data { + struct dma_router dmarouter; + DECLARE_BITMAP(used_chans, 2 * RZN1_DMAMUX_LINES_PER_CTLR); +}; + +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); + + clear_bit(map->req_idx, dmamux->used_chans); + + 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; + + if (dma_spec->args_count != RNZ1_DMAMUX_NCELLS) + return ERR_PTR(-EINVAL); + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return ERR_PTR(-ENOMEM); + + 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_LINES_PER_CTLR) { + dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan); + ret = -EINVAL; + goto free_map; + } + + if (map->req_idx >= RZN1_DMAMUX_MAX_LINES || + (map->req_idx % RZN1_DMAMUX_LINES_PER_CTLR) != chan) { + dev_err(&pdev->dev, "Invalid MUX request line: %u\n", map->req_idx); + ret = -EINVAL; + goto free_map; + } + + dmac_idx = map->req_idx >= RZN1_DMAMUX_LINES_PER_CTLR ? 1 : 0; + 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"); + ret = -EINVAL; + goto free_map; + } + + dev_dbg(&pdev->dev, "Mapping DMAMUX request %u to DMAC%u request %u\n", + map->req_idx, dmac_idx, chan); + + if (test_and_set_bit(map->req_idx, dmamux->used_chans)) { + ret = -EBUSY; + goto free_map; + } + + mask = BIT(map->req_idx); + ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0); + if (ret) + goto clear_bitmap; + + return map; + +clear_bitmap: + clear_bit(map->req_idx, dmamux->used_chans); +free_map: + kfree(map); + + return ERR_PTR(ret); +} + +static const struct of_device_id rzn1_dmac_match[] = { + { .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; + + 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