From patchwork Mon Mar 25 12:07:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vaittinen, Matti" X-Patchwork-Id: 10868961 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 1BCAB139A for ; Mon, 25 Mar 2019 12:07:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 04CC32915D for ; Mon, 25 Mar 2019 12:07:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EC6D4292D6; Mon, 25 Mar 2019 12:07:49 +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=ham 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 B59402915D for ; Mon, 25 Mar 2019 12:07:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731149AbfCYMHo (ORCPT ); Mon, 25 Mar 2019 08:07:44 -0400 Received: from mail-lf1-f66.google.com ([209.85.167.66]:35151 "EHLO mail-lf1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729386AbfCYMHm (ORCPT ); Mon, 25 Mar 2019 08:07:42 -0400 Received: by mail-lf1-f66.google.com with SMTP id u21so5825450lfu.2; Mon, 25 Mar 2019 05:07:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=A1subxtAmPc/IKuWhFYSEK+9V1eBS0k+N4cvt1jhiJs=; b=fniZh5GLnuqEqAj9RhERNI6b3CmxG7yMaozuc2I/1Ctj3g4jzdXGxqhe8Od80oC+rA DMbOgsL5uAGl+Hl+cLVcbkfTSqmIBwPFbmNLz3qvsBf/E1bCe4QV2PsY933mbiP2Pqio OTl6S5PWSvDKnrxqO0AbO81/2cJYZvaJMKOcdRqNQOaAAwUsLfRJE82Z05zCgzHElsMl QrHaozy/RecSzVfVKWUo+GC8qpO9I6hJYaF2mrfunBfUlTmUIyhFFATYdh3fzvQauDxN 4hYUiVZqOywUuZmRnUOe5g/OHYHsgNqFdJRBa8KwXoq8EWarSUjZNOJYGgTLtL32r209 f68w== X-Gm-Message-State: APjAAAVJqM41eMo2np2nYOjQw85a6OybtavRBErvekP9Dj4jLI1PKH1Q WoGU+X1KEtaSaRTqBkaMuG0= X-Google-Smtp-Source: APXvYqyw1WNESBgz2/TMxaVo1oICKCWEGtJJKtgXcKoPk3zYJH9DBQuJtXpNYhx5GeJd8NOghMdkgQ== X-Received: by 2002:ac2:5629:: with SMTP id b9mr11781834lff.100.1553515658742; Mon, 25 Mar 2019 05:07:38 -0700 (PDT) Received: from localhost.localdomain ([213.255.186.46]) by smtp.gmail.com with ESMTPSA id q5sm3365979lfm.16.2019.03.25.05.07.37 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 25 Mar 2019 05:07:38 -0700 (PDT) Date: Mon, 25 Mar 2019 14:07:25 +0200 From: Matti Vaittinen To: matti.vaittinen@fi.rohmeurope.com, mazziesaccount@gmail.com Cc: Lee Jones , Rob Herring , Mark Rutland , Michael Turquette , Stephen Boyd , Linus Walleij , Bartosz Golaszewski , Sebastian Reichel , Liam Girdwood , Mark Brown , Alessandro Zummo , Alexandre Belloni , Wim Van Sebroeck , Guenter Roeck , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, linux-pm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org, heikki.haikola@fi.rohmeurope.com, mikko.mutanen@fi.rohmeurope.com Subject: [PATCH v11 8/8] watchdog: bd70528: Initial support for ROHM BD70528 watchdog block Message-ID: <8a7bfec0b7ebd191436e25ac89242c3a6f149604.1553515333.git.matti.vaittinen@fi.rohmeurope.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Initial support for watchdog block included in ROHM BD70528 power management IC. Configurations for low power states are still to be checked. Signed-off-by: Matti Vaittinen Acked-by: Guenter Roeck --- drivers/watchdog/Kconfig | 12 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/bd70528_wdt.c | 187 +++++++++++++++++++++++++++++++++ 3 files changed, 200 insertions(+) create mode 100644 drivers/watchdog/bd70528_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 242eea859637..a00bf649d7f0 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -90,6 +90,18 @@ config SOFT_WATCHDOG_PRETIMEOUT watchdog. Be aware that governors might affect the watchdog because it is purely software, e.g. the panic governor will stall it! +config BD70528_WATCHDOG + tristate "ROHM BD70528 PMIC Watchdog" + depends on MFD_ROHM_BD70528 + select WATCHDOG_CORE + help + Support for the watchdog in the ROHM BD70528 PMIC. Watchdog trigger + cause system reset. + + Say Y here to include support for the ROHM BD70528 watchdog. + Alternatively say M to compile the driver as a module, + which will be called bd70528_wdt. + config DA9052_WATCHDOG tristate "Dialog DA9052 Watchdog" depends on PMIC_DA9052 || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index ba930e464657..3985922c440a 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -205,6 +205,7 @@ obj-$(CONFIG_WATCHDOG_SUN4V) += sun4v_wdt.o obj-$(CONFIG_XEN_WDT) += xen_wdt.o # Architecture Independent +obj-$(CONFIG_BD70528_WATCHDOG) += bd70528_wdt.o obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o diff --git a/drivers/watchdog/bd70528_wdt.c b/drivers/watchdog/bd70528_wdt.c new file mode 100644 index 000000000000..c014c915932a --- /dev/null +++ b/drivers/watchdog/bd70528_wdt.c @@ -0,0 +1,187 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 ROHM Semiconductors +// ROHM BD70528MWV watchdog driver + +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Max time we can set is 1 hour, 59 minutes and 59 seconds + * and Minimum time is 1 second + */ +#define WDT_MAX_MS ((2 * 60 * 60 - 1) * 1000) +#define WDT_MIN_MS 1000 +#define DEFAULT_TIMEOUT 60 + +struct wdtbd70528 { + struct device *dev; + struct regmap *regmap; + struct rohm_regmap_dev *mfd; + struct watchdog_device wdt; +}; + +static int bd70528_wdt_set_locked(struct wdtbd70528 *w, int enable) +{ + return bd70528_wdt_set(w->mfd, enable, NULL); +} + +static int bd70528_wdt_change(struct wdtbd70528 *w, int enable) +{ + int ret; + + bd70528_wdt_lock(w->mfd); + ret = bd70528_wdt_set_locked(w, enable); + bd70528_wdt_unlock(w->mfd); + + return ret; +} + +static int bd70528_wdt_start(struct watchdog_device *wdt) +{ + struct wdtbd70528 *w = watchdog_get_drvdata(wdt); + + dev_dbg(w->dev, "WDT ping...\n"); + return bd70528_wdt_change(w, 1); +} + +static int bd70528_wdt_stop(struct watchdog_device *wdt) +{ + struct wdtbd70528 *w = watchdog_get_drvdata(wdt); + + dev_dbg(w->dev, "WDT stopping...\n"); + return bd70528_wdt_change(w, 0); +} + +static int bd70528_wdt_set_timeout(struct watchdog_device *wdt, + unsigned int timeout) +{ + unsigned int hours; + unsigned int minutes; + unsigned int seconds; + int ret; + struct wdtbd70528 *w = watchdog_get_drvdata(wdt); + + seconds = timeout; + hours = timeout / (60 * 60); + /* Maximum timeout is 1h 59m 59s => hours is 1 or 0 */ + if (hours) + seconds -= (60 * 60); + minutes = seconds / 60; + seconds = seconds % 60; + + bd70528_wdt_lock(w->mfd); + + ret = bd70528_wdt_set_locked(w, 0); + if (ret) + goto out_unlock; + + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_HOUR, + BD70528_MASK_WDT_HOUR, hours); + if (ret) { + dev_err(w->dev, "Failed to set WDT hours\n"); + goto out_en_unlock; + } + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_MINUTE, + BD70528_MASK_WDT_MINUTE, bin2bcd(minutes)); + if (ret) { + dev_err(w->dev, "Failed to set WDT minutes\n"); + goto out_en_unlock; + } + ret = regmap_update_bits(w->regmap, BD70528_REG_WDT_SEC, + BD70528_MASK_WDT_SEC, bin2bcd(seconds)); + if (ret) + dev_err(w->dev, "Failed to set WDT seconds\n"); + else + dev_dbg(w->dev, "WDT tmo set to %u\n", timeout); + +out_en_unlock: + ret = bd70528_wdt_set_locked(w, 1); +out_unlock: + bd70528_wdt_unlock(w->mfd); + + return ret; +} + +static const struct watchdog_info bd70528_wdt_info = { + .identity = "bd70528-wdt", + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, +}; + +static const struct watchdog_ops bd70528_wdt_ops = { + .start = bd70528_wdt_start, + .stop = bd70528_wdt_stop, + .set_timeout = bd70528_wdt_set_timeout, +}; + +static int bd70528_wdt_probe(struct platform_device *pdev) +{ + struct rohm_regmap_dev *bd70528; + struct wdtbd70528 *w; + int ret; + unsigned int reg; + + bd70528 = dev_get_drvdata(pdev->dev.parent); + if (!bd70528) { + dev_err(&pdev->dev, "No MFD driver data\n"); + return -EINVAL; + } + w = devm_kzalloc(&pdev->dev, sizeof(*w), GFP_KERNEL); + if (!w) + return -ENOMEM; + + w->regmap = bd70528->regmap; + w->mfd = bd70528; + w->dev = &pdev->dev; + + w->wdt.info = &bd70528_wdt_info; + w->wdt.ops = &bd70528_wdt_ops; + w->wdt.min_hw_heartbeat_ms = WDT_MIN_MS; + w->wdt.max_hw_heartbeat_ms = WDT_MAX_MS; + w->wdt.parent = pdev->dev.parent; + w->wdt.timeout = DEFAULT_TIMEOUT; + watchdog_set_drvdata(&w->wdt, w); + watchdog_init_timeout(&w->wdt, 0, pdev->dev.parent); + + ret = bd70528_wdt_set_timeout(&w->wdt, w->wdt.timeout); + if (ret) { + dev_err(&pdev->dev, "Failed to set the watchdog timeout\n"); + return ret; + } + + bd70528_wdt_lock(w->mfd); + ret = regmap_read(w->regmap, BD70528_REG_WDT_CTRL, ®); + bd70528_wdt_unlock(w->mfd); + + if (ret) { + dev_err(&pdev->dev, "Failed to get the watchdog state\n"); + return ret; + } + if (reg & BD70528_MASK_WDT_EN) { + dev_dbg(&pdev->dev, "watchdog was running during probe\n"); + set_bit(WDOG_HW_RUNNING, &w->wdt.status); + } + + ret = devm_watchdog_register_device(&pdev->dev, &w->wdt); + if (ret < 0) + dev_err(&pdev->dev, "watchdog registration failed: %d\n", ret); + + return ret; +} +static struct platform_driver bd70528_wdt = { + .driver = { + .name = "bd70528-wdt" + }, + .probe = bd70528_wdt_probe, +}; + +module_platform_driver(bd70528_wdt); + +MODULE_AUTHOR("Matti Vaittinen "); +MODULE_DESCRIPTION("BD70528 watchdog driver"); +MODULE_LICENSE("GPL");