watchdog: stpmic1: Add STPMIC1 watchdog driver (28804c2c) · Commits · 戴 / test

drivers/watchdog/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -817,6 +817,18 @@ config STM32_WATCHDOG
		To compile this driver as a module, choose M here: the
		module will be called stm32_iwdg.

		config STPMIC1_WATCHDOG
		tristate "STPMIC1 PMIC watchdog support"
		depends on MFD_STPMIC1
		select WATCHDOG_CORE
		help
		Say Y here to include watchdog support embedded into STPMIC1 PMIC.
		If the watchdog timer expires, stpmic1 will shut down all its power
		supplies.

		To compile this driver as a module, choose M here: the
		module will be called spmic1_wdt.

		config UNIPHIER_WATCHDOG
		tristate "UniPhier watchdog support"
		depends on ARCH_UNIPHIER \|\| COMPILE_TEST

drivers/watchdog/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -220,3 +220,4 @@ obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
		obj-$(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

drivers/watchdog/stpmic1_wdt.c

0 → 100644

+139 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) STMicroelectronics 2018
		// Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.

		#include <linux/kernel.h>
		#include <linux/mfd/stpmic1.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/of.h>
		#include <linux/regmap.h>
		#include <linux/slab.h>
		#include <linux/watchdog.h>

		/* WATCHDOG CONTROL REGISTER bit */
		#define WDT_START BIT(0)
		#define WDT_PING BIT(1)
		#define WDT_START_MASK BIT(0)
		#define WDT_PING_MASK BIT(1)
		#define WDT_STOP 0

		#define PMIC_WDT_MIN_TIMEOUT 1
		#define PMIC_WDT_MAX_TIMEOUT 256
		#define PMIC_WDT_DEFAULT_TIMEOUT 30

		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) ")");

		struct stpmic1_wdt {
		struct stpmic1 *pmic;
		struct watchdog_device wdtdev;
		};

		static int pmic_wdt_start(struct watchdog_device *wdd)
		{
		struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);

		return regmap_update_bits(wdt->pmic->regmap,
		WCHDG_CR, WDT_START_MASK, WDT_START);
		}

		static int pmic_wdt_stop(struct watchdog_device *wdd)
		{
		struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);

		return regmap_update_bits(wdt->pmic->regmap,
		WCHDG_CR, WDT_START_MASK, WDT_STOP);
		}

		static int pmic_wdt_ping(struct watchdog_device *wdd)
		{
		struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);

		return regmap_update_bits(wdt->pmic->regmap,
		WCHDG_CR, WDT_PING_MASK, WDT_PING);
		}

		static int pmic_wdt_set_timeout(struct watchdog_device *wdd,
		unsigned int timeout)
		{
		struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);

		wdd->timeout = timeout;
		/* timeout is equal to register value + 1 */
		return regmap_write(wdt->pmic->regmap, WCHDG_TIMER_CR, timeout - 1);
		}

		static const struct watchdog_info pmic_watchdog_info = {
		.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE,
		.identity = "STPMIC1 PMIC Watchdog",
		};

		static const struct watchdog_ops pmic_watchdog_ops = {
		.owner = THIS_MODULE,
		.start = pmic_wdt_start,
		.stop = pmic_wdt_stop,
		.ping = pmic_wdt_ping,
		.set_timeout = pmic_wdt_set_timeout,
		};

		static int pmic_wdt_probe(struct platform_device *pdev)
		{
		int ret;
		struct stpmic1 *pmic;
		struct stpmic1_wdt *wdt;

		if (!pdev->dev.parent)
		return -EINVAL;

		pmic = dev_get_drvdata(pdev->dev.parent);
		if (!pmic)
		return -EINVAL;

		wdt = devm_kzalloc(&pdev->dev, sizeof(struct stpmic1_wdt), GFP_KERNEL);
		if (!wdt)
		return -ENOMEM;

		wdt->pmic = pmic;

		wdt->wdtdev.info = &pmic_watchdog_info;
		wdt->wdtdev.ops = &pmic_watchdog_ops;
		wdt->wdtdev.min_timeout = PMIC_WDT_MIN_TIMEOUT;
		wdt->wdtdev.max_timeout = PMIC_WDT_MAX_TIMEOUT;
		wdt->wdtdev.parent = &pdev->dev;

		wdt->wdtdev.timeout = PMIC_WDT_DEFAULT_TIMEOUT;
		watchdog_init_timeout(&wdt->wdtdev, 0, &pdev->dev);

		watchdog_set_nowayout(&wdt->wdtdev, nowayout);
		watchdog_set_drvdata(&wdt->wdtdev, wdt);

		ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdtdev);
		if (ret)
		return ret;

		dev_dbg(wdt->pmic->dev, "PMIC Watchdog driver probed\n");
		return 0;
		}

		static const struct of_device_id of_pmic_wdt_match[] = {
		{ .compatible = "st,stpmic1-wdt" },
		{ },
		};

		MODULE_DEVICE_TABLE(of, of_pmic_wdt_match);

		static struct platform_driver stpmic1_wdt_driver = {
		.probe = pmic_wdt_probe,
		.driver = {
		.name = "stpmic1-wdt",
		.of_match_table = of_pmic_wdt_match,
		},
		};
		module_platform_driver(stpmic1_wdt_driver);

		MODULE_DESCRIPTION("Watchdog driver for STPMIC1 device");
		MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
		MODULE_LICENSE("GPL v2");

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