watchdog: Add support for ux500_wdt watchdog (f0e5bd41) · Commits · 戴 / test

drivers/watchdog/Kconfig

+12 −0

Original line number	Diff line number	Diff line
		@@ -364,6 +364,18 @@ config IMX2_WDT
		To compile this driver as a module, choose M here: the
		module will be called imx2_wdt.

		config UX500_WATCHDOG
		tristate "ST-Ericsson Ux500 watchdog"
		depends on MFD_DB8500_PRCMU
		select WATCHDOG_CORE
		default y
		help
		Say Y here to include Watchdog timer support for the watchdog
		existing in the prcmu of ST-Ericsson Ux500 series platforms.

		To compile this driver as a module, choose M here: the
		module will be called ux500_wdt.

		# AVR32 Architecture

		config AT32AP700X_WDT

drivers/watchdog/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -52,6 +52,7 @@ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
		obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
		obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
		obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
		obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o

		# AVR32 Architecture
		obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o

drivers/watchdog/ux500_wdt.c

0 → 100644

+171 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) ST-Ericsson SA 2011-2013
		*
		* License Terms: GNU General Public License v2
		*
		* Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
		* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/moduleparam.h>
		#include <linux/miscdevice.h>
		#include <linux/err.h>
		#include <linux/uaccess.h>
		#include <linux/watchdog.h>
		#include <linux/platform_device.h>
		#include <linux/platform_data/ux500_wdt.h>

		#include <linux/mfd/dbx500-prcmu.h>

		#define WATCHDOG_TIMEOUT 600 /* 10 minutes */

		#define WATCHDOG_MIN 0
		#define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */
		#define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */

		static unsigned int timeout = WATCHDOG_TIMEOUT;
		module_param(timeout, uint, 0);
		MODULE_PARM_DESC(timeout,
		"Watchdog timeout in seconds. default="
		__MODULE_STRING(WATCHDOG_TIMEOUT) ".");

		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 ux500_wdt_start(struct watchdog_device *wdd)
		{
		return prcmu_enable_a9wdog(PRCMU_WDOG_ALL);
		}

		static int ux500_wdt_stop(struct watchdog_device *wdd)
		{
		return prcmu_disable_a9wdog(PRCMU_WDOG_ALL);
		}

		static int ux500_wdt_keepalive(struct watchdog_device *wdd)
		{
		return prcmu_kick_a9wdog(PRCMU_WDOG_ALL);
		}

		static int ux500_wdt_set_timeout(struct watchdog_device *wdd,
		unsigned int timeout)
		{
		ux500_wdt_stop(wdd);
		prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
		ux500_wdt_start(wdd);

		return 0;
		}

		static const struct watchdog_info ux500_wdt_info = {
		.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE,
		.identity = "Ux500 WDT",
		.firmware_version = 1,
		};

		static const struct watchdog_ops ux500_wdt_ops = {
		.owner = THIS_MODULE,
		.start = ux500_wdt_start,
		.stop = ux500_wdt_stop,
		.ping = ux500_wdt_keepalive,
		.set_timeout = ux500_wdt_set_timeout,
		};

		static struct watchdog_device ux500_wdt = {
		.info = &ux500_wdt_info,
		.ops = &ux500_wdt_ops,
		.min_timeout = WATCHDOG_MIN,
		.max_timeout = WATCHDOG_MAX32,
		};

		static int ux500_wdt_probe(struct platform_device *pdev)
		{
		int ret;
		struct ux500_wdt_data *pdata = pdev->dev.platform_data;

		if (pdata) {
		if (pdata->timeout > 0)
		timeout = pdata->timeout;
		if (pdata->has_28_bits_resolution)
		ux500_wdt.max_timeout = WATCHDOG_MAX28;
		}

		watchdog_set_nowayout(&ux500_wdt, nowayout);

		/* disable auto off on sleep */
		prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);

		/* set HW initial value */
		prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);

		ret = watchdog_register_device(&ux500_wdt);
		if (ret)
		return ret;

		dev_info(&pdev->dev, "initialized\n");

		return 0;
		}

		static int ux500_wdt_remove(struct platform_device *dev)
		{
		watchdog_unregister_device(&ux500_wdt);

		return 0;
		}

		#ifdef CONFIG_PM
		static int ux500_wdt_suspend(struct platform_device *pdev,
		pm_message_t state)
		{
		if (watchdog_active(&ux500_wdt)) {
		ux500_wdt_stop(&ux500_wdt);
		prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true);

		prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
		ux500_wdt_start(&ux500_wdt);
		}
		return 0;
		}

		static int ux500_wdt_resume(struct platform_device *pdev)
		{
		if (watchdog_active(&ux500_wdt)) {
		ux500_wdt_stop(&ux500_wdt);
		prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);

		prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
		ux500_wdt_start(&ux500_wdt);
		}
		return 0;
		}
		#else
		#define ux500_wdt_suspend NULL
		#define ux500_wdt_resume NULL
		#endif

		static struct platform_driver ux500_wdt_driver = {
		.probe = ux500_wdt_probe,
		.remove = ux500_wdt_remove,
		.suspend = ux500_wdt_suspend,
		.resume = ux500_wdt_resume,
		.driver = {
		.owner = THIS_MODULE,
		.name = "ux500_wdt",
		},
		};

		module_platform_driver(ux500_wdt_driver);

		MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
		MODULE_DESCRIPTION("Ux500 Watchdog Driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
		MODULE_ALIAS("platform:ux500_wdt");

include/linux/platform_data/ux500_wdt.h

0 → 100644

+19 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) ST Ericsson SA 2011
		*
		* License Terms: GNU General Public License v2
		*
		* STE Ux500 Watchdog platform data
		*/
		#ifndef __UX500_WDT_H
		#define __UX500_WDT_H

		/**
		* struct ux500_wdt_data
		*/
		struct ux500_wdt_data {
		unsigned int timeout;
		bool has_28_bits_resolution;
		};

		#endif /* __UX500_WDT_H */

Admin message