From patchwork Tue May 25 18:44:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Romain Perier X-Patchwork-Id: 12279955 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B73FC4707F for ; Tue, 25 May 2021 18:45:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C500613CD for ; Tue, 25 May 2021 18:45:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232541AbhEYSqb (ORCPT ); Tue, 25 May 2021 14:46:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232514AbhEYSq3 (ORCPT ); Tue, 25 May 2021 14:46:29 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A0AFC061574; Tue, 25 May 2021 11:44:58 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id u133so17295807wmg.1; Tue, 25 May 2021 11:44:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=8hOl9Yrw9Tmm8G5l9sOtbitxhPz2DOH0BvkorS/HrdE=; b=f7rc+YsrOYxl3TiXJuHDoriBJ6QtSAWE0t2ooOChHm09aixv+IGtdzGE5+WyIYvWjX Fv4/VjHtDEeSz5zHeWNNEePDS0CBc8tgK62Hlw/rQ4PM8jVMPPo0qg8Ifdp51q/vHydl 8Vw6h/dE+jammrfmFrwc5y/gb2Ifl2Rac+Yi5wtoSkCvrZr9m7TiwC3S42K1erxtJSQM /j+4aW8p48wH8wVLjeu2EFDIxbnc/oE+1SILZuHxB64t1wQFaMe0Q8RgMUB3Tzb0bpvo XMrPzTvdeg98RZRfhxMPfYY5W18EvthjutwBLIAGhOrK4hul8t+uEHseJ6WpCpraktSn /zPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=8hOl9Yrw9Tmm8G5l9sOtbitxhPz2DOH0BvkorS/HrdE=; b=jA822PvT8AKwEgrJpV+ydcYdoHc8//rs6THjb9Ab0suxhZdb/hc/DmyJUuoWW3Lb/m qUuSEf9cONknbG+YF5CcNhctR+9S7d0+wAXXFnoE0lBCMz0ZF7Gk/kALyFTNwF3NwGF7 tDcKeLP6+6rO12VRGEHDe04Vv8H8O886thxwAWWshlxHkfdIkVCaPCtHVLrexVcDFKrY cTQTF31f8yY8VleCx/frcF7ly6xgwMmBaB1IO3jkCSaw2zIm7HZqtYfzKU3AN6Oxuekl XKxTZVNNLJgkS00i3MGSDVN+BcQ2aZZmvlV6soEniuN/RqMtac8GR6j97/qJDnzxdvNa vF/w== X-Gm-Message-State: AOAM533pHHXBla3l04GrampErXY24+N1hJxc/7PGCav0ZtFYT67ivWD9 h8s3+EfIAL5G3cMGuo7CKGLVQQUz2Hg= X-Google-Smtp-Source: ABdhPJyrJMDULk7xK0nzKkEOEb84T1OKykQHTw5YHKeQlzRG8XStJFDNTy9SnjLuMadZRwXpUnPrLg== X-Received: by 2002:a1c:cc05:: with SMTP id h5mr5169753wmb.92.1621968296598; Tue, 25 May 2021 11:44:56 -0700 (PDT) Received: from debby (176-141-241-253.abo.bbox.fr. [176.141.241.253]) by smtp.gmail.com with ESMTPSA id o8sm17171135wrx.4.2021.05.25.11.44.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 May 2021 11:44:56 -0700 (PDT) From: Romain Perier To: Wim Van Sebroeck , Guenter Roeck , Rob Herring Cc: Daniel Palmer , Mohammed Billoo , linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] watchdog: Add Mstar MSC313e WDT driver Date: Tue, 25 May 2021 20:44:48 +0200 Message-Id: <20210525184449.57703-3-romain.perier@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210525184449.57703-1-romain.perier@gmail.com> References: <20210525184449.57703-1-romain.perier@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Daniel Palmer It adds a driver for the IP block handling the watchdog timer found for Mstar MSC313e SoCs and newer. Signed-off-by: Daniel Palmer Co-developed-by: Romain Perier Signed-off-by: Romain Perier --- MAINTAINERS | 1 + drivers/watchdog/Kconfig | 13 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/msc313e_wdt.c | 173 +++++++++++++++++++++++++++++++++ 4 files changed, 188 insertions(+) create mode 100644 drivers/watchdog/msc313e_wdt.c diff --git a/MAINTAINERS b/MAINTAINERS index a0f37adb9e64..fcc10c57298c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2177,6 +2177,7 @@ F: arch/arm/mach-mstar/ F: drivers/clk/mstar/ F: drivers/gpio/gpio-msc313.c F: drivers/pinctrl/pinctrl-msc313.c +F: drivers/watchdog/msc313e_wdt.c F: include/dt-bindings/clock/mstar-* F: include/dt-bindings/gpio/msc313-gpio.h F: include/soc/mstar/ diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 355100dad60a..f53634ea0de6 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -980,6 +980,19 @@ config VISCONTI_WATCHDOG Say Y here to include support for the watchdog timer in Toshiba Visconti SoCs. +config MSC313E_WATCHDOG + tristate "MStar MSC313e watchdog" + depends on ARCH_MSTARV7 || COMPILE_TEST + depends on OF + select WATCHDOG_CORE + help + Say Y here to include support for the Watchdog timer embedded + into MStar MSC313e chips. This will reboot your system when the + timeout is reached. + + To compile this driver as a module, choose M here: the + module will be called msc313e_wdt. + # X86 (i386 + ia64 + x86_64) Architecture config ACQUIRE_WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index a7eade8b4d45..7fa392ae3000 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -92,6 +92,7 @@ obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o obj-$(CONFIG_ARM_SMC_WATCHDOG) += arm_smc_wdt.o obj-$(CONFIG_VISCONTI_WATCHDOG) += visconti_wdt.o +obj-$(CONFIG_MSC313E_WATCHDOG) += msc313e_wdt.o # X86 (i386 + ia64 + x86_64) Architecture obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o diff --git a/drivers/watchdog/msc313e_wdt.c b/drivers/watchdog/msc313e_wdt.c new file mode 100644 index 000000000000..434259256967 --- /dev/null +++ b/drivers/watchdog/msc313e_wdt.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MStar WDT driver + * + * Copyright (C) 2019 - 2021 Daniel Palmer + * Copyright (C) 2021 Romain Perier + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define REG_WDT_CLR 0x0 +#define REG_WDT_MAX_PRD_L 0x10 +#define REG_WDT_MAX_PRD_H 0x14 + +#define MSC313E_WDT_DEFAULT_TIMEOUT 30 +/* Supports 1 - 350 sec */ +#define MSC313E_WDT_MIN_TIMEOUT 1 +#define MSC313E_WDT_MAX_TIMEOUT 350 + +static unsigned int timeout; + +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds"); + +struct msc313e_wdt_priv { + void __iomem *base; + struct device *dev; + struct watchdog_device wdev; + struct clk *clk; +}; + +static int msc313e_wdt_start(struct watchdog_device *wdev) +{ + struct msc313e_wdt_priv *priv = watchdog_get_drvdata(wdev); + u32 timeout; + int err; + + err = clk_prepare_enable(priv->clk); + if (err) { + dev_err(priv->dev, "failed to enable clock\n"); + return err; + } + timeout = wdev->timeout * clk_get_rate(priv->clk); + writew(timeout & 0xffff, priv->base + REG_WDT_MAX_PRD_L); + writew((timeout >> 16) & 0xffff, priv->base + REG_WDT_MAX_PRD_H); + writew(1, priv->base + REG_WDT_CLR); + return 0; +} + +static int msc313e_wdt_ping(struct watchdog_device *wdev) +{ + struct msc313e_wdt_priv *priv = watchdog_get_drvdata(wdev); + + writew(1, priv->base + REG_WDT_CLR); + return 0; +} + +static int msc313e_wdt_stop(struct watchdog_device *wdev) +{ + struct msc313e_wdt_priv *priv = watchdog_get_drvdata(wdev); + + writew(0, priv->base + REG_WDT_MAX_PRD_L); + writew(0, priv->base + REG_WDT_MAX_PRD_H); + writew(0, priv->base + REG_WDT_CLR); + clk_disable_unprepare(priv->clk); + return 0; +} + +static int msc313e_wdt_settimeout(struct watchdog_device *wdev, unsigned int new_time) +{ + wdev->timeout = new_time; + + return msc313e_wdt_start(wdev); +} + +static const struct watchdog_info msc313e_wdt_ident = { + .identity = "MSC313e watchdog", + .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT, +}; + +static const struct watchdog_ops msc313e_wdt_ops = { + .owner = THIS_MODULE, + .start = msc313e_wdt_start, + .stop = msc313e_wdt_stop, + .ping = msc313e_wdt_ping, + .set_timeout = msc313e_wdt_settimeout, +}; + +static const struct of_device_id msc313e_wdt_of_match[] = { + { .compatible = "mstar,msc313e-wdt", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, msc313e_wdt_of_match); + +static int msc313e_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct msc313e_wdt_priv *priv; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + priv->clk = devm_clk_get(dev, NULL); + if (IS_ERR(priv->clk)) { + dev_err(dev, "No input clock\n"); + return PTR_ERR(priv->clk); + } + + priv->dev = dev; + priv->wdev.info = &msc313e_wdt_ident, + priv->wdev.ops = &msc313e_wdt_ops, + priv->wdev.parent = dev; + priv->wdev.min_timeout = MSC313E_WDT_MIN_TIMEOUT; + priv->wdev.max_timeout = MSC313E_WDT_MAX_TIMEOUT; + priv->wdev.timeout = MSC313E_WDT_DEFAULT_TIMEOUT; + + watchdog_set_drvdata(&priv->wdev, priv); + + watchdog_init_timeout(&priv->wdev, timeout, dev); + watchdog_stop_on_reboot(&priv->wdev); + watchdog_stop_on_unregister(&priv->wdev); + + return devm_watchdog_register_device(dev, &priv->wdev); +} + +static int __maybe_unused msc313e_wdt_suspend(struct device *dev) +{ + struct msc313e_wdt_priv *priv = dev_get_drvdata(dev); + + if (watchdog_active(&priv->wdev)) + msc313e_wdt_stop(&priv->wdev); + + return 0; +} + +static int __maybe_unused msc313e_wdt_resume(struct device *dev) +{ + struct msc313e_wdt_priv *priv = dev_get_drvdata(dev); + + if (watchdog_active(&priv->wdev)) + msc313e_wdt_start(&priv->wdev); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(msc313e_wdt_pm_ops, msc313e_wdt_suspend, msc313e_wdt_resume); + +static struct platform_driver msc313e_wdt_driver = { + .driver = { + .name = "msc313e-wdt", + .of_match_table = msc313e_wdt_of_match, + .pm = &msc313e_wdt_pm_ops, + }, + .probe = msc313e_wdt_probe, +}; +module_platform_driver(msc313e_wdt_driver); + +MODULE_AUTHOR("Daniel Palmer "); +MODULE_DESCRIPTION("Watchdog driver for MStar MSC313e"); +MODULE_LICENSE("GPL v2");