watchdog: imx_sc: Add i.MX system controller watchdog support (986857ac) · Commits · 戴 / test

drivers/watchdog/Kconfig

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		@@ -653,6 +653,22 @@ config IMX2_WDT
		To compile this driver as a module, choose M here: the
		module will be called imx2_wdt.

		config IMX_SC_WDT
		tristate "IMX SC Watchdog"
		depends on HAVE_ARM_SMCCC
		select WATCHDOG_CORE
		help
		This is the driver for the system controller watchdog
		on the NXP i.MX SoCs with system controller inside, the
		watchdog driver will call ARM SMC API and trap into
		ARM-Trusted-Firmware for operations, ARM-Trusted-Firmware
		will request system controller to execute the operations.
		If you have one of these processors and wish to have
		watchdog support enabled, say Y, otherwise say N.

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

		config UX500_WATCHDOG
		tristate "ST-Ericsson Ux500 watchdog"
		depends on MFD_DB8500_PRCMU

drivers/watchdog/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -68,6 +68,7 @@ obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
		obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
		obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
		obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
		obj-$(CONFIG_IMX_SC_WDT) += imx_sc_wdt.o
		obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
		obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
		obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o

drivers/watchdog/imx_sc_wdt.c

0 → 100644

+177 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright 2018-2019 NXP.
		*/

		#include <linux/arm-smccc.h>
		#include <linux/io.h>
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/reboot.h>
		#include <linux/watchdog.h>

		#define DEFAULT_TIMEOUT 60
		/*
		* Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms
		* in theory, but for normal case, 1s~128s is enough, you can change this max
		* value in case it's not enough.
		*/
		#define MAX_TIMEOUT 128

		#define IMX_SIP_TIMER 0xC2000002
		#define IMX_SIP_TIMER_START_WDOG 0x01
		#define IMX_SIP_TIMER_STOP_WDOG 0x02
		#define IMX_SIP_TIMER_SET_WDOG_ACT 0x03
		#define IMX_SIP_TIMER_PING_WDOG 0x04
		#define IMX_SIP_TIMER_SET_TIMEOUT_WDOG 0x05
		#define IMX_SIP_TIMER_GET_WDOG_STAT 0x06
		#define IMX_SIP_TIMER_SET_PRETIME_WDOG 0x07

		#define SC_TIMER_WDOG_ACTION_PARTITION 0

		static bool nowayout = WATCHDOG_NOWAYOUT;
		module_param(nowayout, bool, 0000);
		MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

		static int imx_sc_wdt_ping(struct watchdog_device *wdog)
		{
		struct arm_smccc_res res;

		arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_PING_WDOG,
		0, 0, 0, 0, 0, 0, &res);

		return 0;
		}

		static int imx_sc_wdt_start(struct watchdog_device *wdog)
		{
		struct arm_smccc_res res;

		arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG,
		0, 0, 0, 0, 0, 0, &res);
		if (res.a0)
		return -EACCES;

		arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT,
		SC_TIMER_WDOG_ACTION_PARTITION,
		0, 0, 0, 0, 0, &res);
		return res.a0 ? -EACCES : 0;
		}

		static int imx_sc_wdt_stop(struct watchdog_device *wdog)
		{
		struct arm_smccc_res res;

		arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG,
		0, 0, 0, 0, 0, 0, &res);

		return res.a0 ? -EACCES : 0;
		}

		static int imx_sc_wdt_set_timeout(struct watchdog_device *wdog,
		unsigned int timeout)
		{
		struct arm_smccc_res res;

		wdog->timeout = timeout;
		arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_TIMEOUT_WDOG,
		timeout * 1000, 0, 0, 0, 0, 0, &res);

		return res.a0 ? -EACCES : 0;
		}

		static const struct watchdog_ops imx_sc_wdt_ops = {
		.owner = THIS_MODULE,
		.start = imx_sc_wdt_start,
		.stop = imx_sc_wdt_stop,
		.ping = imx_sc_wdt_ping,
		.set_timeout = imx_sc_wdt_set_timeout,
		};

		static const struct watchdog_info imx_sc_wdt_info = {
		.identity = "i.MX SC watchdog timer",
		.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \|
		WDIOF_MAGICCLOSE \| WDIOF_PRETIMEOUT,
		};

		static int imx_sc_wdt_probe(struct platform_device *pdev)
		{
		struct watchdog_device *imx_sc_wdd;
		int ret;

		imx_sc_wdd = devm_kzalloc(&pdev->dev, sizeof(*imx_sc_wdd), GFP_KERNEL);
		if (!imx_sc_wdd)
		return -ENOMEM;

		platform_set_drvdata(pdev, imx_sc_wdd);

		imx_sc_wdd->info = &imx_sc_wdt_info;
		imx_sc_wdd->ops = &imx_sc_wdt_ops;
		imx_sc_wdd->min_timeout = 1;
		imx_sc_wdd->max_timeout = MAX_TIMEOUT;
		imx_sc_wdd->parent = &pdev->dev;
		imx_sc_wdd->timeout = DEFAULT_TIMEOUT;

		ret = watchdog_init_timeout(imx_sc_wdd, 0, &pdev->dev);
		if (ret)
		dev_warn(&pdev->dev, "Failed to set timeout value, using default\n");

		watchdog_stop_on_reboot(imx_sc_wdd);
		watchdog_stop_on_unregister(imx_sc_wdd);

		ret = devm_watchdog_register_device(&pdev->dev, imx_sc_wdd);
		if (ret) {
		dev_err(&pdev->dev, "Failed to register watchdog device\n");
		return ret;
		}

		return 0;
		}

		static int __maybe_unused imx_sc_wdt_suspend(struct device *dev)
		{
		struct watchdog_device *imx_sc_wdd = dev_get_drvdata(dev);

		if (watchdog_active(imx_sc_wdd))
		imx_sc_wdt_stop(imx_sc_wdd);

		return 0;
		}

		static int __maybe_unused imx_sc_wdt_resume(struct device *dev)
		{
		struct watchdog_device *imx_sc_wdd = dev_get_drvdata(dev);

		if (watchdog_active(imx_sc_wdd))
		imx_sc_wdt_start(imx_sc_wdd);

		return 0;
		}

		static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops,
		imx_sc_wdt_suspend, imx_sc_wdt_resume);

		static const struct of_device_id imx_sc_wdt_dt_ids[] = {
		{ .compatible = "fsl,imx-sc-wdt", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, imx_sc_wdt_dt_ids);

		static struct platform_driver imx_sc_wdt_driver = {
		.probe = imx_sc_wdt_probe,
		.driver = {
		.name = "imx-sc-wdt",
		.of_match_table = imx_sc_wdt_dt_ids,
		.pm = &imx_sc_wdt_pm_ops,
		},
		};
		module_platform_driver(imx_sc_wdt_driver);

		MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>");
		MODULE_DESCRIPTION("NXP i.MX system controller watchdog driver");
		MODULE_LICENSE("GPL v2");

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