From patchwork Fri Jun 28 07:39:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leonard Crestez X-Patchwork-Id: 11021561 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9066D112C for ; Fri, 28 Jun 2019 07:40:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7FEF02849B for ; Fri, 28 Jun 2019 07:40:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 713D3284FC; Fri, 28 Jun 2019 07:40:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5CEF228517 for ; Fri, 28 Jun 2019 07:40:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726605AbfF1HkJ (ORCPT ); Fri, 28 Jun 2019 03:40:09 -0400 Received: from inva020.nxp.com ([92.121.34.13]:54886 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726565AbfF1HkJ (ORCPT ); Fri, 28 Jun 2019 03:40:09 -0400 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id C2A0A1A0340; Fri, 28 Jun 2019 09:40:06 +0200 (CEST) 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 ABA9D1A0249; Fri, 28 Jun 2019 09:40:06 +0200 (CEST) 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 C4D3A205D5; Fri, 28 Jun 2019 09:40:05 +0200 (CEST) From: Leonard Crestez To: Alexandre Bailon , Georgi Djakov , Stephen Boyd , Michael Turquette , Viresh Kumar Cc: MyungJoo Ham , Kyungmin Park , Shawn Guo , Dong Aisheng , Fabio Estevam , "Rafael J. Wysocki" , Jacky Bai , Anson Huang , Abel Vesa , Krzysztof Kozlowski , Ulf Hansson , Saravana Kannan , kernel@pengutronix.de, linux-imx@nxp.com, linux-pm@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [RFCv2 6/8] devfreq: Add imx-devfreq driver Date: Fri, 28 Jun 2019 10:39:54 +0300 Message-Id: <5531b22cdcb056c66fc0a51b4c839df5d86049d0.1561707104.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 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add initial support for frequency switches on pieces of the imx interconnect fabric. Uses clk_set_min_rate so that other subsytems can also impose minimum rate requests. Signed-off-by: Leonard Crestez --- drivers/devfreq/Kconfig | 10 +++ drivers/devfreq/Makefile | 1 + drivers/devfreq/imx-devfreq.c | 142 ++++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 drivers/devfreq/imx-devfreq.c diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig index f3b242987fd9..3a7c6265ca2f 100644 --- a/drivers/devfreq/Kconfig +++ b/drivers/devfreq/Kconfig @@ -90,10 +90,20 @@ 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 + select DEVFREQ_GOV_USERSPACE + select PM_OPP + help + This adds the DEVFREQ driver for the Tegra family of SoCs. + It reads ACTMON counters of memory controllers and adjusts the + operating frequencies and voltages with OPP support. + 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 338ae8440db6..c2463ed4c934 100644 --- a/drivers/devfreq/Makefile +++ b/drivers/devfreq/Makefile @@ -7,10 +7,11 @@ obj-$(CONFIG_DEVFREQ_GOV_POWERSAVE) += governor_powersave.o obj-$(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-$(CONFIG_ARM_IMX_DEVFREQ) += imx-devfreq.o obj-$(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..aa8868d32f22 --- /dev/null +++ b/drivers/devfreq/imx-devfreq.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2019 NXP + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct imx_devfreq { + struct devfreq_dev_profile profile; + struct devfreq *devfreq; + struct clk *clk; +}; + +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); + + ret = clk_set_min_rate(priv->clk, new_freq); + if (ret) + return ret; + + ret = clk_set_rate(priv->clk, 0); + if (ret) { + clk_set_min_rate(priv->clk, priv->devfreq->previous_freq); + return ret; + } + + return 0; +} + +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) +{ + return 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; + 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->devfreq)) { + ret = PTR_ERR(priv->devfreq); + 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); + + priv->devfreq = devm_devfreq_add_device(dev, &priv->profile, + DEVFREQ_GOV_USERSPACE, + NULL); + if (IS_ERR(priv->devfreq)) { + ret = PTR_ERR(priv->devfreq); + dev_err(dev, "failed to add devfreq device: %d\n", ret); + goto err_remove_table; + } + + return 0; + +err_remove_table: + dev_pm_opp_of_remove_table(dev); + return ret; +} + +static const struct of_device_id imx_devfreq_of_match[] = { + { .compatible = "fsl,imx8mm-ddrc", }, + { .compatible = "fsl,imx8mm-noc", }, + { .compatible = "fsl,imx8mm-nic", }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, imx_devfreq_of_match); + +static struct platform_driver imx_devfreq_platdrv = { + .probe = imx_devfreq_probe, + .driver = { + .name = "devfreq-imx", + .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_LICENSE("GPL v2");