From patchwork Tue Apr 12 10:21:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12810577 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 D1B92C433F5 for ; Tue, 12 Apr 2022 11:42:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242981AbiDLLoQ (ORCPT ); Tue, 12 Apr 2022 07:44:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349354AbiDLLla (ORCPT ); Tue, 12 Apr 2022 07:41:30 -0400 Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [IPv6:2001:4b98:dc4:8::229]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17E7A7A9B8; Tue, 12 Apr 2022 03:22:01 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 90020FF806; Tue, 12 Apr 2022 10:21:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1649758920; 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=fc1EMTESvKZKrAhGF8hkdxTklTMsYD2ZWOwRLw0zqHA=; b=LPuB8B8AMcVYoB7HdGoZMWfwkoAJfQQr6pZpEoqr/Za21/hLrhe9kVxYfHP5mxiWpUImLg D0t+V7/C9ZgbgvBm35zHM9uc4fFucQDELoix+VcVooZxUR4dst05b66PiEAlKxtGhHs9rE LMzB9Q5M11GMfMvZDuysbj8tEt33hm3EnE6nYHQOfm/5qYaPeSUOXYumA3bny6sFGB7ayO S2qv6pFJxB1nGbTAU618TXFpyjctGGIblPxitdlCd/AhJrcx98jwST8cx+aIQLfGUS9mG0 A8x3YxWbr39bchkSoCrsSi8o2ER0uYE4rfer4SBaH9e0GNe5TCZ7/ujsgB4crQ== 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 v9 5/9] dmaengine: dw: dmamux: Introduce RZN1 DMA router support Date: Tue, 12 Apr 2022 12:21:34 +0200 Message-Id: <20220412102138.45975-6-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220412102138.45975-1-miquel.raynal@bootlin.com> References: <20220412102138.45975-1-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 | 163 +++++++++++++++++++++++++++++++++++ 3 files changed, 174 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..4d6f2f6d98d0 --- /dev/null +++ b/drivers/dma/dw/rzn1-dmamux.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Schneider-Electric + * Author: Miquel Raynal + */ +#include +#include +#include +#include + +#define RNZ1_DMAMUX_NCELLS 6 +#define RZN1_DMAMUX_LINES 64 +#define RZN1_DMAMUX_MAX_LINES 16 + +struct rzn1_dmamux_data { + struct dma_router dmarouter; + unsigned long *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); + clear_bit(BIT(map->req_idx), dmamux->used_chans); + 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; + + 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_MAX_LINES) { + dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan); + ret = -EINVAL; + goto free_map; + } + + if (map->req_idx >= RZN1_DMAMUX_LINES || + (map->req_idx % RZN1_DMAMUX_MAX_LINES) != 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_MAX_LINES ? 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); + + mask = BIT(map->req_idx); + + mutex_lock(&dmamux->lock); + ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0); + if (ret) + goto unlock; + + set_bit(mask, dmamux->used_chans); + mutex_unlock(&dmamux->lock); + + return map; + +unlock: + mutex_unlock(&dmamux->lock); +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; + + dmamux->used_chans = devm_bitmap_zalloc(&pdev->dev, 2 * RZN1_DMAMUX_MAX_LINES, + GFP_KERNEL); + if (!dmamux->used_chans) + 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