From patchwork Thu Oct 31 22:52:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leonard Crestez X-Patchwork-Id: 11222023 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 56012913 for ; Thu, 31 Oct 2019 22:53:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 32E0F20862 for ; Thu, 31 Oct 2019 22:53:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="qrLFPJ4U" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 32E0F20862 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nxp.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=/4nTPxrozpMD7BhROv5EheZ+IpOD8W4PnWXfOtYpGgk=; b=qrLFPJ4UL+csSS3+vjYPqkuYgZ gzoWAY68fv5FP9BBH0IUnv1UALt4KCbynSB+HDeviOVON/CjG4BVnm4lAnIxMYYbBY9yHQ2sI1rM/ OH7fcxYOzWhbCdX/cqLw/UXwjJuSykKi9IxE+R6A8kTKJ50vjsagWNyN4nISX4S7K03Qg8q9E1wKH PXWXIwBKmFAio/QaKqdz+0Zh9r29mYv8bU9frKEcSdwYx0oC90zAPq0/1MTxNdQdRGkiaKvgx4BU0 h6L7IjvxpJ5OpG7kEvl9Fkb4yM/5nVK2Ct8bsOni3ftKuvsnT1AH4cVc3hXC0I5jBiZDM6FE/uhGO Yq8MdBcA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iQJJM-0001zp-3l; Thu, 31 Oct 2019 22:53:00 +0000 Received: from inva020.nxp.com ([92.121.34.13]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iQJIj-0001X9-Vq for linux-arm-kernel@lists.infradead.org; Thu, 31 Oct 2019 22:52:23 +0000 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 43D761A02DC; Thu, 31 Oct 2019 23:52:20 +0100 (CET) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 2B2D31A01D2; Thu, 31 Oct 2019 23:52:20 +0100 (CET) Received: from fsr-ub1864-112.ea.freescale.net (fsr-ub1864-112.ea.freescale.net [10.171.82.98]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 1F5EE205E9; Thu, 31 Oct 2019 23:52:19 +0100 (CET) From: Leonard Crestez To: Georgi Djakov , Rob Herring , Chanwoo Choi Subject: [PATCH RFC v5 02/10] PM / devfreq: Add generic imx bus driver Date: Fri, 1 Nov 2019 00:52:01 +0200 Message-Id: <0d9b694504c760b6f7938c90c75d83d167a214e4.1572562150.git.leonard.crestez@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191031_155222_302055_9E9DB3B2 X-CRM114-Status: GOOD ( 18.08 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [92.121.34.13 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , =?utf-8?b?QXJ0dXIgxZp3aWdvxYQ=?= , Jacky Bai , "Rafael J. Wysocki" , Viresh Kumar , Michael Turquette , Angus Ainslie , MyungJoo Ham , Abel Vesa , Anson Huang , Krzysztof Kozlowski , Matthias Kaehlcke , linux-imx@nxp.com, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, Martin Kepplinger , linux-arm-kernel@lists.infradead.org, Dong Aisheng , Saravana Kannan , Stephen Boyd , Kyungmin Park , kernel@pengutronix.de, Fabio Estevam , Shawn Guo , Alexandre Bailon MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add initial support for dynamic frequency switching on pieces of the imx interconnect fabric. All this driver does is set a clk rate based on an opp table, it does not even map registers. Signed-off-by: Leonard Crestez --- drivers/devfreq/Kconfig | 12 +++ drivers/devfreq/Makefile | 1 + drivers/devfreq/imx-devfreq.c | 148 ++++++++++++++++++++++++++++++++++ 3 files changed, 161 insertions(+) create mode 100644 drivers/devfreq/imx-devfreq.c diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index defe1d438710..9088a151bafe 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -90,10 +90,22 @@ config ARM_EXYNOS_BUS_DEVFREQ Each memory bus group could contain many memoby bus block. It reads PPMU counters of memory controllers by using DEVFREQ-event device and adjusts the operating frequencies and voltages with OPP support. This does not yet operate with optimal voltages. +config ARM_IMX_DEVFREQ + tristate "i.MX DEVFREQ Driver" + depends on ARCH_MXC || COMPILE_TEST + select DEVFREQ_GOV_PASSIVE + select DEVFREQ_GOV_SIMPLE_ONDEMAND + select DEVFREQ_GOV_USERSPACE + select PM_OPP + help + This adds the DEVFREQ driver for the i.MX family of SoCs. + It allows adjusting frequencies for DDRC (DDR Controller) and various + NICs and NOCs which form the SOC interconnect fabric + config ARM_TEGRA_DEVFREQ tristate "NVIDIA Tegra30/114/124/210 DEVFREQ Driver" depends on ARCH_TEGRA_3x_SOC || ARCH_TEGRA_114_SOC || \ ARCH_TEGRA_132_SOC || ARCH_TEGRA_124_SOC || \ ARCH_TEGRA_210_SOC || \ diff --git a/drivers/devfreq/Makefile b/drivers/devfreq/Makefile index 1ac92614b6aa..1c1f35f74d24 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -8,10 +8,11 @@ obj-$(CONFIG_DEVFREQ_GOV_USERSPACE) += governor_userspace.o obj-$(CONFIG_DEVFREQ_GOV_PASSIVE) += governor_passive.o # DEVFREQ Drivers obj-$(CONFIG_ARM_EXYNOS_BUS_DEVFREQ) += exynos-bus.o obj-$(CONFIG_ARM_IMX_DEVFREQ) += imx-ddrc.o +obj-$(CONFIG_ARM_IMX_DEVFREQ) += imx-devfreq.o obj-$(CONFIG_ARM_RK3399_DMC_DEVFREQ) += rk3399_dmc.o obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra30-devfreq.o obj-$(CONFIG_ARM_TEGRA20_DEVFREQ) += tegra20-devfreq.o # DEVFREQ Event Drivers diff --git a/drivers/devfreq/imx-devfreq.c b/drivers/devfreq/imx-devfreq.c new file mode 100644 index 000000000000..5c907b3ab9c0 --- /dev/null +++ b/drivers/devfreq/imx-devfreq.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2019 NXP + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct imx_devfreq { + struct devfreq_dev_profile profile; + struct devfreq *devfreq; + struct clk *clk; + struct devfreq_passive_data passive_data; +}; + +static int imx_devfreq_target(struct device *dev, unsigned long *freq, u32 flags) +{ + struct imx_devfreq *priv = dev_get_drvdata(dev); + struct dev_pm_opp *new_opp; + unsigned long new_freq; + int ret; + + new_opp = devfreq_recommended_opp(dev, freq, flags); + if (IS_ERR(new_opp)) { + ret = PTR_ERR(new_opp); + dev_err(dev, "failed to get recommended opp: %d\n", ret); + return ret; + } + new_freq = dev_pm_opp_get_freq(new_opp); + dev_pm_opp_put(new_opp); + + return clk_set_rate(priv->clk, new_freq); +} + +static int imx_devfreq_get_cur_freq(struct device *dev, unsigned long *freq) +{ + struct imx_devfreq *priv = dev_get_drvdata(dev); + + *freq = clk_get_rate(priv->clk); + + return 0; +} + +static int imx_devfreq_get_dev_status(struct device *dev, + struct devfreq_dev_status *stat) +{ + struct imx_devfreq *priv = dev_get_drvdata(dev); + + stat->busy_time = 0; + stat->total_time = 0; + stat->current_frequency = clk_get_rate(priv->clk); + + return 0; +} + +static void imx_devfreq_exit(struct device *dev) +{ + dev_pm_opp_of_remove_table(dev); +} + +static int imx_devfreq_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct imx_devfreq *priv; + const char *gov = DEVFREQ_GOV_USERSPACE; + void *govdata = NULL; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->clk = devm_clk_get(dev, NULL); + if (IS_ERR(priv->clk)) { + ret = PTR_ERR(priv->clk); + dev_err(dev, "failed to fetch clk: %d\n", ret); + return ret; + } + platform_set_drvdata(pdev, priv); + + ret = dev_pm_opp_of_add_table(dev); + if (ret < 0) { + dev_err(dev, "failed to get OPP table\n"); + return ret; + } + + priv->profile.polling_ms = 1000; + priv->profile.target = imx_devfreq_target; + priv->profile.get_dev_status = imx_devfreq_get_dev_status; + priv->profile.exit = imx_devfreq_exit; + priv->profile.get_cur_freq = imx_devfreq_get_cur_freq; + priv->profile.initial_freq = clk_get_rate(priv->clk); + + /* Handle passive devfreq parent link */ + priv->passive_data.parent = devfreq_get_devfreq_by_phandle(dev, 0); + if (!IS_ERR(priv->passive_data.parent)) { + dev_info(dev, "passive link to %s\n", + dev_name(priv->passive_data.parent->dev.parent)); + gov = DEVFREQ_GOV_PASSIVE; + govdata = &priv->passive_data; + } else if (priv->passive_data.parent != ERR_PTR(-ENODEV)) { + // -ENODEV means no parent: not an error. + ret = PTR_ERR(priv->passive_data.parent); + if (ret != -EPROBE_DEFER) + dev_warn(dev, "failed to get passive parent: %d\n", ret); + goto err; + } + + priv->devfreq = devm_devfreq_add_device(dev, &priv->profile, + gov, govdata); + if (IS_ERR(priv->devfreq)) { + ret = PTR_ERR(priv->devfreq); + dev_err(dev, "failed to add devfreq device: %d\n", ret); + goto err; + } + + return 0; + +err: + dev_pm_opp_of_remove_table(dev); + return ret; +} + +static const struct of_device_id imx_devfreq_of_match[] = { + { .compatible = "fsl,imx8m-noc", }, + { .compatible = "fsl,imx8m-nic", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, imx_devfreq_of_match); + +static struct platform_driver imx_devfreq_platdrv = { + .probe = imx_devfreq_probe, + .driver = { + .name = "imx-devfreq", + .of_match_table = of_match_ptr(imx_devfreq_of_match), + }, +}; +module_platform_driver(imx_devfreq_platdrv); + +MODULE_DESCRIPTION("Generic i.MX bus frequency driver"); +MODULE_AUTHOR("Leonard Crestez "); +MODULE_LICENSE("GPL v2");