From: Michael Walle <michael@walle.cc> 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" <linus.walleij@linaro.org>, "Bartosz Golaszewski" <bgolaszewski@baylibre.com>, "Rob Herring" <robh+dt@kernel.org>, "Jean Delvare" <jdelvare@suse.com>, "Guenter Roeck" <linux@roeck-us.net>, "Lee Jones" <lee.jones@linaro.org>, "Thierry Reding" <thierry.reding@gmail.com>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>, "Wim Van Sebroeck" <wim@linux-watchdog.org>, "Shawn Guo" <shawnguo@kernel.org>, "Li Yang" <leoyang.li@nxp.com>, "Thomas Gleixner" <tglx@linutronix.de>, "Jason Cooper" <jason@lakedaemon.net>, "Marc Zyngier" <maz@kernel.org>, "Michael Walle" <michael@walle.cc> 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> (raw) In-Reply-To: <20200317205017.28280-1-michael@walle.cc> 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 <michael@walle.cc> --- 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/regmap.h> +#include <linux/platform_device.h> +#include <linux/watchdog.h> + +/* + * 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"); -- 2.20.1
next prev parent reply index Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-17 20:49 [PATCH 00/18] Add support for Kontron sl28cpld Michael Walle 2020-03-17 20:50 ` [PATCH 01/18] include/linux/ioport.h: add helper to define REG resource constructs Michael Walle 2020-03-17 20:50 ` [PATCH 02/18] mfd: mfd-core: Don't overwrite the dma_mask of the child device Michael Walle 2020-03-17 20:50 ` [PATCH 03/18] mfd: mfd-core: match device tree node against reg property Michael Walle 2020-03-17 20:50 ` [PATCH 04/18] dt-bindings: mfd: Add bindings for sl28cpld Michael Walle 2020-03-30 22:35 ` Rob Herring 2020-03-31 7:40 ` Michael Walle 2020-03-17 20:50 ` [PATCH 05/18] mfd: Add support for Kontron sl28cpld management controller Michael Walle 2020-03-18 3:28 ` Guenter Roeck 2020-03-18 16:38 ` Michael Walle 2020-03-17 20:50 ` [PATCH 06/18] irqchip: add sl28cpld interrupt controller support Michael Walle 2020-03-18 16:53 ` Guenter Roeck 2020-03-18 17:06 ` Michael Walle 2020-03-18 20:35 ` Guenter Roeck 2020-03-17 20:50 ` [PATCH 07/18] dt-bindings: watchdog: Add bindings for sl28cpld watchdog Michael Walle 2020-03-17 20:50 ` Michael Walle [this message] 2020-03-18 3:17 ` [PATCH 08/18] watchdog: add support " Guenter Roeck 2020-03-17 20:50 ` [PATCH 09/18] dt-bindings: pwm: Add bindings for sl28cpld PWM controller Michael Walle 2020-03-17 20:50 ` [PATCH 10/18] pwm: add support " Michael Walle 2020-03-17 20:50 ` [PATCH 11/18] dt-bindings: gpio: Add bindings for sl28cpld GPIO controller Michael Walle 2020-03-17 20:50 ` [PATCH 12/18] gpio: add support for the " Michael Walle 2020-03-18 9:14 ` Bartosz Golaszewski 2020-03-18 12:45 ` Michael Walle 2020-03-25 11:50 ` Bartosz Golaszewski 2020-03-26 20:05 ` Michael Walle 2020-03-27 10:20 ` Linus Walleij 2020-03-27 15:28 ` Michael Walle 2020-03-27 19:01 ` Linus Walleij 2020-03-30 11:21 ` Bartosz Golaszewski 2020-03-30 11:48 ` Michael Walle 2020-03-28 12:04 ` Michael Walle 2020-03-28 17:20 ` Michael Walle 2020-03-17 20:50 ` [PATCH 13/18] dt-bindings: hwmon: Add bindings for sl28cpld hardware monitoring Michael Walle 2020-03-17 20:50 ` [PATCH 14/18] hwmon: add support for the sl28cpld hardware monitoring controller Michael Walle 2020-03-18 3:27 ` Guenter Roeck 2020-03-18 16:32 ` Michael Walle 2020-03-17 20:50 ` [PATCH 15/18] arm64: dts: freescale: sl28: enable sl28cpld Michael Walle 2020-03-17 20:50 ` [PATCH 16/18] arm64: dts: freescale: sl28: map GPIOs to input events Michael Walle 2020-03-17 20:50 ` [PATCH 17/18] arm64: dts: freescale: sl28: enable LED support Michael Walle 2020-03-17 20:50 ` [PATCH 18/18] arm64: dts: freescale: sl28: enable fan support Michael Walle
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20200317205017.28280-9-michael@walle.cc \ --to=michael@walle.cc \ --cc=bgolaszewski@baylibre.com \ --cc=devicetree@vger.kernel.org \ --cc=jason@lakedaemon.net \ --cc=jdelvare@suse.com \ --cc=lee.jones@linaro.org \ --cc=leoyang.li@nxp.com \ --cc=linus.walleij@linaro.org \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-gpio@vger.kernel.org \ --cc=linux-hwmon@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-pwm@vger.kernel.org \ --cc=linux-watchdog@vger.kernel.org \ --cc=linux@roeck-us.net \ --cc=maz@kernel.org \ --cc=robh+dt@kernel.org \ --cc=shawnguo@kernel.org \ --cc=tglx@linutronix.de \ --cc=thierry.reding@gmail.com \ --cc=u.kleine-koenig@pengutronix.de \ --cc=wim@linux-watchdog.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: link
Linux-Watchdog Archive on lore.kernel.org Archives are clonable: git clone --mirror https://lore.kernel.org/linux-watchdog/0 linux-watchdog/git/0.git # If you have public-inbox 1.1+ installed, you may # initialize and index your mirror using the following commands: public-inbox-init -V2 linux-watchdog linux-watchdog/ https://lore.kernel.org/linux-watchdog \ linux-watchdog@vger.kernel.org public-inbox-index linux-watchdog Example config snippet for mirrors Newsgroup available over NNTP: nntp://nntp.lore.kernel.org/org.kernel.vger.linux-watchdog AGPL code for this site: git clone https://public-inbox.org/public-inbox.git