From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Sat, 10 Apr 2021 12:36:52 +0200 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lVAyy-0000yc-Ji for lore@lore.pengutronix.de; Sat, 10 Apr 2021 12:36:52 +0200 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lVAyx-0007Sf-NK for lore@pengutronix.de; Sat, 10 Apr 2021 12:36:52 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5l5x0mAS3e5cXjkuYswRwMz7NbkWrowRaUraemZlzUc=; b=qJEtefFjiR5ju03te53Q4sHSF 3tILyta+QjdIdztnRG/vVJjB2fRo954tMuu2Gg/n1Q5GByqPM8K27qDNVkU8xVLwyfnFKMPQSo2qg hqmOIGdkzDMP1hCA23eMhNQ2pFqmrRwDPy1/UeUWLfGyRuLftRoSlwD93JWdZnuxP79X6Y6MOfFr5 5b19iTV67s2Z+QITapFIpaUOhj4+i8DchQQ4OL57otx42KTYLo4FUoEzmlfuTid4RLeNVkTHJ/jJ2 YD1ZuhG269f13zJlK3pg46upZWExvf+PlPWm0VtGU1wnc2jFbBYO8ETLK25inxiFhBCKLe3WyqXbj p+Q35QwJA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lVAxi-002fKk-Dj; Sat, 10 Apr 2021 10:35:34 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lVAxZ-002fK0-4y for barebox@desiato.infradead.org; Sat, 10 Apr 2021 10:35:25 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=8YvKmnSrqwfnwAvBLEpnB4GIGubDdGygqb0ufE+cuH4=; b=hMnECN+pGaNb3SLQrhGjJcN3SX rTKcdKDTB9eEm1M5dP9dw2i0A48tXtijTR6k/MOq0daic5RMR83GIHlND1yZARq0xhPBewov9HpaH 8cKSShy5piyRITMLQIMhxoOjGe0i047FqnUkzLl5IkBetyXrWql4X15BolCRfcYnjmVsG30HuFxoz hv9WuMb3SsCNCCENAtDP9KVr+1sSf6AfPIcHw5CQHSTWDxPRxI+YTnXqRNiLEhNNDfEEvc+lLPv3N HoUzqSSepjJQPMdl829KCz7cajCSqOMCsc+KOV+SI/egGe7HQGdMMlMpfSBpf9jqKaJsJhfVoAurK VJ5ba1/Q==; Received: from relay2-d.mail.gandi.net ([217.70.183.194]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lVAxW-0052M8-2U for barebox@lists.infradead.org; Sat, 10 Apr 2021 10:35:23 +0000 X-Originating-IP: 83.135.94.168 Received: from geraet.fritz.box (unknown [83.135.94.168]) (Authenticated sender: ahmad@a3f.at) by relay2-d.mail.gandi.net (Postfix) with ESMTPSA id D75F040008; Sat, 10 Apr 2021 10:35:17 +0000 (UTC) From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Sat, 10 Apr 2021 12:35:11 +0200 Message-Id: <20210410103511.2073504-5-ahmad@a3f.at> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210410103511.2073504-1-ahmad@a3f.at> References: <20210410103511.2073504-1-ahmad@a3f.at> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210410_033522_405752_7E9C2E61 X-CRM114-Status: GOOD ( 18.20 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2001:8b0:10b:1:d65d:64ff:fe57:4e05 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.1 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH 5/5] watchdog: add GPIO watchdog driver X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) This is a straight port from Linux v5.11. Signed-off-by: Ahmad Fatoum --- drivers/watchdog/Kconfig | 7 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/gpio_wdt.c | 142 ++++++++++++++++++++++++++++++++++++ 3 files changed, 150 insertions(+) create mode 100644 drivers/watchdog/gpio_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 8750a97d8c50..fb4ea7ffac3c 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -117,6 +117,13 @@ config F71808E_WDT F71862FG, F71868, F71869, F71882FG, F71889FG, F81865 and F81866 Super I/O controllers. +config GPIO_WATCHDOG + tristate "Watchdog device controlled through GPIO-line" + depends on OF_GPIO + help + If you say yes here you get support for watchdog device + controlled through GPIO-line. + config ITCO_WDT bool "Intel TCO Timer/Watchdog" depends on X86 diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index b55c58cf3cb3..9edb73512903 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -17,3 +17,4 @@ obj-$(CONFIG_STM32_IWDG_WATCHDOG) += stm32_iwdg.o obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o obj-$(CONFIG_ITCO_WDT) += itco_wdt.o +obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o diff --git a/drivers/watchdog/gpio_wdt.c b/drivers/watchdog/gpio_wdt.c new file mode 100644 index 000000000000..4de49dcee38a --- /dev/null +++ b/drivers/watchdog/gpio_wdt.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for watchdog device controlled through GPIO-line + * + * Author: 2013, Alexander Shiyan + */ + +#include +#include +#include +#include +#include + +enum { + HW_ALGO_TOGGLE, + HW_ALGO_LEVEL, +}; + +struct gpio_wdt_priv { + int gpio; + bool state; + bool started; + unsigned int hw_algo; + struct watchdog wdd; +}; + +static inline struct gpio_wdt_priv *to_gpio_wdt_priv(struct watchdog *wdd) +{ + return container_of(wdd, struct gpio_wdt_priv, wdd); +} + +static void gpio_wdt_disable(struct gpio_wdt_priv *priv) +{ + /* Eternal ping */ + gpio_set_active(priv->gpio, 1); + + /* Put GPIO back to tristate */ + if (priv->hw_algo == HW_ALGO_TOGGLE) + gpio_direction_input(priv->gpio); + + priv->started = false; +} + +static void gpio_wdt_ping(struct gpio_wdt_priv *priv) +{ + switch (priv->hw_algo) { + case HW_ALGO_TOGGLE: + /* Toggle output pin */ + priv->state = !priv->state; + gpio_set_active(priv->gpio, priv->state); + break; + case HW_ALGO_LEVEL: + /* Pulse */ + gpio_set_active(priv->gpio, true); + udelay(1); + gpio_set_active(priv->gpio, false); + break; + } +} + +static void gpio_wdt_start(struct gpio_wdt_priv *priv) +{ + priv->state = false; + gpio_direction_active(priv->gpio, priv->state); + priv->started = true; +} + +static int gpio_wdt_set_timeout(struct watchdog *wdd, unsigned int new_timeout) +{ + struct gpio_wdt_priv *priv = to_gpio_wdt_priv(wdd); + + if (!new_timeout) { + gpio_wdt_disable(priv); + return 0; + } + + if (!priv->started) + gpio_wdt_start(priv); + + gpio_wdt_ping(priv); + return 0; +} + +static int gpio_wdt_probe(struct device_d *dev) +{ + struct device_node *np = dev->device_node; + struct gpio_wdt_priv *priv; + enum gpiod_flags gflags; + unsigned int hw_margin; + const char *algo; + int ret; + + priv = xzalloc(sizeof(*priv)); + + ret = of_property_read_u32(np, "hw_margin_ms", &hw_margin); + if (ret) + return ret; + + /* Autoping is fixed at one ping every 500 ms. Round it up to a second */ + if (hw_margin < 1000) + return -EINVAL; + + ret = of_property_read_string(np, "hw_algo", &algo); + if (ret) + return ret; + if (!strcmp(algo, "toggle")) { + priv->hw_algo = HW_ALGO_TOGGLE; + gflags = GPIOD_IN; + } else if (!strcmp(algo, "level")) { + priv->hw_algo = HW_ALGO_LEVEL; + gflags = GPIOD_OUT_LOW; + } else { + return -EINVAL; + } + + priv->gpio = gpiod_get(dev, NULL, gflags); + if (priv->gpio < 0) + return priv->gpio; + + priv->wdd.hwdev = dev; + priv->wdd.timeout_max = hw_margin / 1000; + priv->wdd.priority = 129; + priv->wdd.set_timeout = gpio_wdt_set_timeout; + + return watchdog_register(&priv->wdd); +} + +static const struct of_device_id gpio_wdt_dt_ids[] = { + { .compatible = "linux,wdt-gpio", }, + { } +}; + +static struct driver_d gpio_wdt_driver = { + .name = "gpio-wdt", + .of_compatible = gpio_wdt_dt_ids, + .probe = gpio_wdt_probe, +}; +device_platform_driver(gpio_wdt_driver); + +MODULE_AUTHOR("Alexander Shiyan "); +MODULE_DESCRIPTION("GPIO Watchdog"); +MODULE_LICENSE("GPL"); -- 2.30.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox