From patchwork Tue Feb 22 10:34:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12754818 X-Patchwork-Delegate: geert@linux-m68k.org 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 EAA7DC433F5 for ; Tue, 22 Feb 2022 10:35:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231232AbiBVKfg (ORCPT ); Tue, 22 Feb 2022 05:35:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230437AbiBVKfe (ORCPT ); Tue, 22 Feb 2022 05:35:34 -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 B4FCD15B983; Tue, 22 Feb 2022 02:35:08 -0800 (PST) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id DCE6DFF811; Tue, 22 Feb 2022 10:35:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1645526107; 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=Epk2uTeuvShgaggsLxcN9kC/j5VSYJM1XeKDbbQfB8E=; b=n7TrvmfpRWupIlxSVQnlP2XwIArfX68MjNAemZTUDBIyjlVXi944fkoEhfqaNSovS+pazQ QlyM/R5ezqPTsj0G7X4aA0B9r6O/xB/A4WhcM4boqmphn3hTvRSVRpIKP0LXk4NywRzgog qK4TXBrMnWS56XCUFxOvJJoGGRg/+e8PDeRm3eLG8aOUwN46pocL6bndt9Jxj/f+kPCjzl nznCnGtoMjzcz0jEEUsGA+uEnSND3qA6VVXxzmbDMRy00JM1/3vMiilE4O1XMP8Tra1lkj 3XXZ4U9LPfTWgCqa82lh0xMk9pvQ44acRZB5rak1aDGcuGeOBJROZ9W1/6sfKA== From: Miquel Raynal To: Vinod Koul , Andy Shevchenko Cc: dmaengine@vger.kernel.org, Rob Herring , devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Magnus Damm , Gareth Williams , Phil Edworthy , Geert Uytterhoeven , Stephen Boyd , Michael Turquette , linux-clk@vger.kernel.org, Thomas Petazzoni , Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Miquel Raynal Subject: [PATCH v2 4/8] dma: dmamux: Introduce RZN1 DMA router support Date: Tue, 22 Feb 2022 11:34:33 +0100 Message-Id: <20220222103437.194779-5-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220222103437.194779-1-miquel.raynal@bootlin.com> References: <20220222103437.194779-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@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 Reported-by: kernel test robot --- drivers/dma/dw/Kconfig | 8 ++ drivers/dma/dw/Makefile | 2 + drivers/dma/dw/dmamux.c | 167 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 177 insertions(+) create mode 100644 drivers/dma/dw/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..7c6e0ab6fcd8 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-$(CONFIG_RZN1_DMAMUX) += dmamux.o + obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o dw_dmac_pci-y := pci.o diff --git a/drivers/dma/dw/dmamux.c b/drivers/dma/dw/dmamux.c new file mode 100644 index 000000000000..5fb3ffb82e88 --- /dev/null +++ b/drivers/dma/dw/dmamux.c @@ -0,0 +1,167 @@ +// 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 + +struct rzn1_dmamux_data { + struct dma_router dmarouter; + unsigned int dmac_requests; + unsigned int dmamux_requests; + 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 master, 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 >= dmamux->dmac_requests) { + dev_err(&pdev->dev, "Invalid DMA request line: %d\n", chan); + return ERR_PTR(-EINVAL); + } + + if (map->req_idx >= dmamux->dmamux_requests || + map->req_idx % dmamux->dmac_requests != chan) { + dev_err(&pdev->dev, "Invalid MUX request line: %d\n", map->req_idx); + return ERR_PTR(-EINVAL); + } + + /* The of_node_put() will be done in the core for the node */ + master = map->req_idx >= dmamux->dmac_requests ? 1 : 0; + dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", master); + 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, master, 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); + if (!match) { + of_node_put(dmac_node); + return dev_err_probe(&pdev->dev, -EINVAL, "DMA master is not supported\n"); + } + + if (of_property_read_u32(dmac_node, "dma-requests", &dmamux->dmac_requests)) { + of_node_put(dmac_node); + return dev_err_probe(&pdev->dev, -EINVAL, "Missing DMAC requests information\n"); + } + + of_node_put(dmac_node); + + if (of_property_read_u32(mux_node, "dma-requests", &dmamux->dmamux_requests)) { + return dev_err_probe(&pdev->dev, -EINVAL, "Missing mux requests information\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, +}; + +static int rzn1_dmamux_init(void) +{ + return platform_driver_register(&rzn1_dmamux_driver); +} +arch_initcall(rzn1_dmamux_init);