From patchwork Tue Mar 17 20:50:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 11443991 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 6CD8A90 for ; Tue, 17 Mar 2020 20:51:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 397D52076F for ; Tue, 17 Mar 2020 20:51:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=walle.cc header.i=@walle.cc header.b="jsqGqW/y" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727033AbgCQUu6 (ORCPT ); Tue, 17 Mar 2020 16:50:58 -0400 Received: from ssl.serverraum.org ([176.9.125.105]:48037 "EHLO ssl.serverraum.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726958AbgCQUu5 (ORCPT ); Tue, 17 Mar 2020 16:50:57 -0400 Received: from apollo.fritz.box (unknown [IPv6:2a02:810c:c200:2e91:6257:18ff:fec4:ca34]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id C5B2823E68; Tue, 17 Mar 2020 21:50:52 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1584478253; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VqfcYwyDQKikiyO04HE5MBT8kgxBHODa92cy3skiEn0=; b=jsqGqW/yWgCdmWAn2/TKlz1FzzlAfVx4LVerrvKmRnuMaBRtNkWsXvN+jMLUwS7Uy0U63E KDT/SvAArSsGCt3GQ8eg+1UtoXbBhMLOZp/ZERJOtvBvtcPVmKqspt34573eetvemNSl5M yIdOOByfbOZ9ZtQ1Cz5FrRF6Je+NGqc= From: Michael Walle To: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Linus Walleij , Bartosz Golaszewski , Rob Herring , Jean Delvare , Guenter Roeck , Lee Jones , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Wim Van Sebroeck , Shawn Guo , Li Yang , Thomas Gleixner , Jason Cooper , Marc Zyngier , Michael Walle Subject: [PATCH 08/18] watchdog: add support for sl28cpld watchdog Date: Tue, 17 Mar 2020 21:50:07 +0100 Message-Id: <20200317205017.28280-9-michael@walle.cc> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200317205017.28280-1-michael@walle.cc> References: <20200317205017.28280-1-michael@walle.cc> MIME-Version: 1.0 X-Spamd-Bar: ++++++ X-Spam-Level: ****** X-Rspamd-Server: web X-Spam-Status: Yes, score=6.40 X-Spam-Score: 6.40 X-Rspamd-Queue-Id: C5B2823E68 X-Spamd-Result: default: False [6.40 / 15.00]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TAGGED_RCPT(0.00)[dt]; MIME_GOOD(-0.10)[text/plain]; BROKEN_CONTENT_TYPE(1.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_SPAM(0.00)[0.507]; DKIM_SIGNED(0.00)[]; RCPT_COUNT_TWELVE(0.00)[22]; MID_CONTAINS_FROM(1.00)[]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:31334, ipnet:2a02:810c:8000::/33, country:DE]; FREEMAIL_CC(0.00)[linaro.org,baylibre.com,kernel.org,suse.com,roeck-us.net,gmail.com,pengutronix.de,linux-watchdog.org,nxp.com,linutronix.de,lakedaemon.net,walle.cc]; SUSPICIOUS_RECIPS(1.50)[] X-Spam: Yes Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org This adds support for the watchdog of the sl28cpld board management controller. This is part of a multi-function device driver. Signed-off-by: Michael Walle --- drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/sl28cpld_wdt.c | 238 ++++++++++++++++++++++++++++++++ 3 files changed, 250 insertions(+) create mode 100644 drivers/watchdog/sl28cpld_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 9ea2b43d4b01..c78b90ccc8cf 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -340,6 +340,17 @@ config MLX_WDT To compile this driver as a module, choose M here: the module will be called mlx-wdt. +config SL28CPLD_WATCHDOG + tristate "Kontron sl28 watchdog" + depends on MFD_SL28CPLD + select WATCHDOG_CORE + help + Say Y here to include support for the watchdog timer + on the Kontron sl28 CPLD. + + To compile this driver as a module, choose M here: the + module will be called sl28cpld_wdt. + # ALPHA Architecture # ARM Architecture diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 2ee352bf3372..060e2f895fe8 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -223,3 +223,4 @@ obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o obj-$(CONFIG_MENZ069_WATCHDOG) += menz69_wdt.o obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o +obj-$(CONFIG_SL28CPLD_WATCHDOG) += sl28cpld_wdt.o diff --git a/drivers/watchdog/sl28cpld_wdt.c b/drivers/watchdog/sl28cpld_wdt.c new file mode 100644 index 000000000000..5927b7ad0be4 --- /dev/null +++ b/drivers/watchdog/sl28cpld_wdt.c @@ -0,0 +1,238 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SMARC-sAL28 Watchdog driver. + * + * Copyright 2019 Kontron Europe GmbH + */ + +#include +#include +#include +#include +#include +#include +#include + +/* + * Watchdog timer block registers. + */ +#define SL28CPLD_WDT_CTRL 0 +#define WDT_CTRL_EN BIT(0) +#define WDT_CTRL_LOCK BIT(2) +#define SL28CPLD_WDT_TIMEOUT 1 +#define SL28CPLD_WDT_KICK 2 +#define WDT_KICK_VALUE 0x6b +#define SL28CPLD_WDT_COUNT 3 + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static int timeout; +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds"); + +struct sl28cpld_wdt { + struct watchdog_device wdd; + struct regmap *regmap; + u32 offset; +}; + +static int sl28cpld_wdt_ping(struct watchdog_device *wdd) +{ + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + + return regmap_write(wdt->regmap, wdt->offset + SL28CPLD_WDT_KICK, + WDT_KICK_VALUE); +} + +static int sl28cpld_wdt_start(struct watchdog_device *wdd) +{ + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + unsigned int val; + + val = WDT_CTRL_EN; + if (nowayout) + val |= WDT_CTRL_LOCK; + + return regmap_update_bits(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL, + val, val); +} + +static int sl28cpld_wdt_stop(struct watchdog_device *wdd) +{ + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + + return regmap_update_bits(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL, + WDT_CTRL_EN, 0); +} + +static unsigned int sl28cpld_wdt_status(struct watchdog_device *wdd) +{ + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + unsigned int status; + int ret; + + ret = regmap_read(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL, + &status); + if (ret < 0) + return 0; + + /* is the watchdog timer running? */ + return (status & WDT_CTRL_EN) << WDOG_ACTIVE; +} + +static unsigned int sl28cpld_wdt_get_timeleft(struct watchdog_device *wdd) +{ + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + int ret; + unsigned int val; + + ret = regmap_read(wdt->regmap, wdt->offset + SL28CPLD_WDT_COUNT, &val); + if (ret < 0) + return 0; + + return val; +} + +static int sl28cpld_wdt_set_timeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + int ret; + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + + ret = regmap_write(wdt->regmap, wdt->offset + SL28CPLD_WDT_TIMEOUT, + timeout); + if (ret == 0) + wdd->timeout = timeout; + + return ret; +} + +static const struct watchdog_info sl28cpld_wdt_info = { + .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .identity = "SMARC-sAL28 CPLD watchdog", +}; + +static struct watchdog_ops sl28cpld_wdt_ops = { + .owner = THIS_MODULE, + .start = sl28cpld_wdt_start, + .stop = sl28cpld_wdt_stop, + .status = sl28cpld_wdt_status, + .ping = sl28cpld_wdt_ping, + .set_timeout = sl28cpld_wdt_set_timeout, + .get_timeleft = sl28cpld_wdt_get_timeleft, +}; + +static int sl28cpld_wdt_locked(struct sl28cpld_wdt *wdt) +{ + unsigned int val; + int ret; + + ret = regmap_read(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL, &val); + if (ret < 0) + return ret; + + return val & WDT_CTRL_LOCK; +} + +static int sl28cpld_wdt_probe(struct platform_device *pdev) +{ + struct sl28cpld_wdt *wdt; + struct watchdog_device *wdd; + struct resource *res; + unsigned int val; + int ret; + + wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); + if (!wdt) + return -ENOMEM; + + if (!pdev->dev.parent) + return -ENODEV; + + wdt->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!wdt->regmap) + return -ENODEV; + + res = platform_get_resource(pdev, IORESOURCE_REG, 0); + if (res == NULL) + return -EINVAL; + wdt->offset = res->start; + + /* initialize struct watchdog_device */ + wdd = &wdt->wdd; + wdd->parent = &pdev->dev; + wdd->info = &sl28cpld_wdt_info; + wdd->ops = &sl28cpld_wdt_ops; + wdd->min_timeout = 1; + wdd->max_timeout = 255; + + watchdog_set_drvdata(wdd, wdt); + + /* if the watchdog is locked, we set nowayout to true */ + ret = sl28cpld_wdt_locked(wdt); + if (ret < 0) + return ret; + if (ret) + nowayout = true; + watchdog_set_nowayout(wdd, nowayout); + + /* + * Initial timeout value, can either be set by kernel parameter or by + * the device tree. If both are not given the current value is used. + */ + watchdog_init_timeout(wdd, timeout, &pdev->dev); + if (wdd->timeout) { + sl28cpld_wdt_set_timeout(wdd, wdd->timeout); + } else { + ret = regmap_read(wdt->regmap, + wdt->offset + SL28CPLD_WDT_TIMEOUT, &val); + if (ret < 0) + return ret; + wdd->timeout = val; + } + + ret = watchdog_register_device(wdd); + if (ret < 0) { + dev_err(&pdev->dev, "failed to register watchdog device\n"); + return ret; + } + + platform_set_drvdata(pdev, wdt); + + dev_info(&pdev->dev, "CPLD watchdog: initial timeout %d sec%s\n", + wdd->timeout, nowayout ? ", nowayout" : ""); + + return 0; +} + +static int sl28cpld_wdt_remove(struct platform_device *pdev) +{ + struct sl28cpld_wdt *wdt = platform_get_drvdata(pdev); + + watchdog_unregister_device(&wdt->wdd); + + return 0; +} + +static void sl28cpld_wdt_shutdown(struct platform_device *pdev) +{ + struct sl28cpld_wdt *wdt = platform_get_drvdata(pdev); + + sl28cpld_wdt_stop(&wdt->wdd); +} + +static struct platform_driver sl28cpld_wdt_driver = { + .probe = sl28cpld_wdt_probe, + .remove = sl28cpld_wdt_remove, + .shutdown = sl28cpld_wdt_shutdown, + .driver = { + .name = "sl28cpld-wdt", + }, +}; +module_platform_driver(sl28cpld_wdt_driver); + +MODULE_DESCRIPTION("sl28cpld Watchdog Driver"); +MODULE_LICENSE("GPL");