/* * Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28 * * Author: Wolfram Sang * * Copyright (C) 2011-12 Wolfram Sang, Pengutronix * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ #include #include #include #include #include #include #include #define WDOG_TICK_RATE 1000 /* 1 kHz clock */ #define STMP3XXX_DEFAULT_TIMEOUT 19 #define STMP3XXX_MAX_TIMEOUT (UINT_MAX / WDOG_TICK_RATE) static int heartbeat = STMP3XXX_DEFAULT_TIMEOUT; module_param(heartbeat, uint, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to " __MODULE_STRING(STMP3XXX_MAX_TIMEOUT) ", default " __MODULE_STRING(STMP3XXX_DEFAULT_TIMEOUT)); static int wdt_start(struct watchdog_device *wdd) { struct device *dev = watchdog_get_drvdata(wdd); struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev); pdata->wdt_set_timeout(dev->parent, wdd->timeout * WDOG_TICK_RATE); return 0; } static int wdt_stop(struct watchdog_device *wdd) { struct device *dev = watchdog_get_drvdata(wdd); struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev); pdata->wdt_set_timeout(dev->parent, 0); return 0; } static int wdt_set_timeout(struct watchdog_device *wdd, unsigned new_timeout) { wdd->timeout = new_timeout; return wdt_start(wdd); } static const struct watchdog_info stmp3xxx_wdt_ident = { .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "STMP3XXX RTC Watchdog", }; static const struct watchdog_ops stmp3xxx_wdt_ops = { .owner = THIS_MODULE, .start = wdt_start, .stop = wdt_stop, .set_timeout = wdt_set_timeout, }; static struct watchdog_device stmp3xxx_wdd = { .info = &stmp3xxx_wdt_ident, .ops = &stmp3xxx_wdt_ops, .min_timeout = 1, .max_timeout = STMP3XXX_MAX_TIMEOUT, .status = WATCHDOG_NOWAYOUT_INIT_STATUS, }; static int wdt_notify_sys(struct notifier_block *nb, unsigned long code, void *unused) { switch (code) { case SYS_DOWN: /* keep enabled, system might crash while going down */ break; case SYS_HALT: /* allow the system to actually halt */ case SYS_POWER_OFF: wdt_stop(&stmp3xxx_wdd); break; } return NOTIFY_DONE; } static struct notifier_block wdt_notifier = { .notifier_call = wdt_notify_sys, }; static int stmp3xxx_wdt_probe(struct platform_device *pdev) { int ret; watchdog_set_drvdata(&stmp3xxx_wdd, &pdev->dev); stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT); stmp3xxx_wdd.parent = &pdev->dev; ret = watchdog_register_device(&stmp3xxx_wdd); if (ret < 0) { dev_err(&pdev->dev, "cannot register watchdog device\n"); return ret; } if (register_reboot_notifier(&wdt_notifier)) dev_warn(&pdev->dev, "cannot register reboot notifier\n"); dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n", stmp3xxx_wdd.timeout); return 0; } static int stmp3xxx_wdt_remove(struct platform_device *pdev) { unregister_reboot_notifier(&wdt_notifier); watchdog_unregister_device(&stmp3xxx_wdd); return 0; } static int __maybe_unused stmp3xxx_wdt_suspend(struct device *dev) { struct watchdog_device *wdd = &stmp3xxx_wdd; if (watchdog_active(wdd)) return wdt_stop(wdd); return 0; } static int __maybe_unused stmp3xxx_wdt_resume(struct device *dev) { struct watchdog_device *wdd = &stmp3xxx_wdd; if (watchdog_active(wdd)) return wdt_start(wdd); return 0; } static SIMPLE_DEV_PM_OPS(stmp3xxx_wdt_pm_ops, stmp3xxx_wdt_suspend, stmp3xxx_wdt_resume); static struct platform_driver stmp3xxx_wdt_driver = { .driver = { .name = "stmp3xxx_rtc_wdt", .pm = &stmp3xxx_wdt_pm_ops, }, .probe = stmp3xxx_wdt_probe, .remove = stmp3xxx_wdt_remove, }; module_platform_driver(stmp3xxx_wdt_driver); MODULE_DESCRIPTION("STMP3XXX RTC Watchdog Driver"); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Wolfram Sang "); button' href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/clock/at91.h?id=36e854c3b8e17db0e9ace2c603d492b71d53b5cd'>logplain -rw-r--r--ath79-clk.h479logplain -rw-r--r--axis,artpec6-clkctrl.h1112logplain -rw-r--r--bcm-cygnus.h3135logplain -rw-r--r--bcm-ns2.h2915logplain -rw-r--r--bcm-nsp.h2148logplain -rw-r--r--bcm21664.h1984logplain -rw-r--r--bcm281xx.h2456logplain -rw-r--r--bcm2835-aux.h635logplain -rw-r--r--bcm2835.h1962logplain -rw-r--r--berlin2.h1034logplain -rw-r--r--berlin2q.h695logplain -rw-r--r--clps711x-clock.h718logplain -rw-r--r--efm32-cmu.h1112logplain -rw-r--r--exynos-audss-clk.h597logplain -rw-r--r--exynos3250.h9083logplain -rw-r--r--exynos4.h8284logplain -rw-r--r--exynos4415.h9828logplain -rw-r--r--exynos5250.h4616logplain -rw-r--r--exynos5260-clk.h14876logplain -rw-r--r--exynos5410.h1689logplain -rw-r--r--exynos5420.h6857logplain -rw-r--r--exynos5433.h45372logplain -rw-r--r--exynos5440.h1141logplain -rw-r--r--exynos7-clk.h5281logplain -rw-r--r--gxbb-aoclkc.h2866logplain -rw-r--r--gxbb-clkc.h592logplain -rw-r--r--hi3516cv300-clock.h1668logplain -rw-r--r--hi3519-clock.h1328logplain -rw-r--r--hi3620-clock.h4496logplain -rw-r--r--hi6220-clock.h4508logplain -rw-r--r--hip04-clock.h1137logplain -rw-r--r--histb-clock.h2012logplain -rw-r--r--hix5hd2-clock.h2415logplain -rw-r--r--imx1-clock.h1055logplain -rw-r--r--imx21-clock.h2461logplain -rw-r--r--imx27-clock.h3494logplain -rw-r--r--imx5-clock.h7212logplain -rw-r--r--imx6qdl-clock.h9593logplain -rw-r--r--imx6sl-clock.h5849logplain -rw-r--r--imx6sx-clock.h9099logplain -rw-r--r--imx6ul-clock.h8203logplain -rw-r--r--imx7d-clock.h15974logplain -rw-r--r--jz4740-cgu.h1028logplain -rw-r--r--jz4780-cgu.h2470logplain -rw-r--r--lpc18xx-ccu.h2134logplain -rw-r--r--lpc18xx-cgu.h1142logplain -rw-r--r--lpc32xx-clock.h1633logplain -rw-r--r--lsi,axm5516-clks.h974logplain -rw-r--r--marvell,mmp2.h2022logplain -rw-r--r--marvell,pxa168.h1654logplain -rw-r--r--marvell,pxa1928.h1535logplain -rw-r--r--marvell,pxa910.h1598logplain -rw-r--r--maxim,max77620.h632logplain -rw-r--r--maxim,max77686.h648logplain -rw-r--r--maxim,max77802.h630logplain -rw-r--r--meson8b-clkc.h523logplain -rw-r--r--microchip,pic32-clock.h1150logplain -rw-r--r--mpc512x-clock.h2236logplain -rw-r--r--mt2701-clk.h13832logplain -rw-r--r--mt8135-clk.h5641logplain -rw-r--r--mt8173-clk.h9293logplain -rw-r--r--oxsemi,ox810se.h1002logplain -rw-r--r--oxsemi,ox820.h1203logplain -rw-r--r--pistachio-clk.h4863logplain -rw-r--r--pxa-clock.h1715logplain -rw-r--r--qcom,gcc-apq8084.h12872logplain -rw-r--r--qcom,gcc-ipq4019.h5423logplain -rw-r--r--qcom,gcc-ipq806x.h8574logplain -rw-r--r--qcom,gcc-mdm9615.h9497logplain -rw-r--r--qcom,gcc-msm8660.h7932logplain -rw-r--r--qcom,gcc-msm8916.h6190logplain -rw-r--r--qcom,gcc-msm8960.h9342logplain -rw-r--r--qcom,gcc-msm8974.h12340logplain -rw-r--r--qcom,gcc-msm8994.h4858logplain -rw-r--r--qcom,gcc-msm8996.h12575logplain -rw-r--r--qcom,lcc-ipq806x.h899logplain -rw-r--r--qcom,lcc-mdm9615.h1701logplain -rw-r--r--qcom,lcc-msm8960.h1616logplain -rw-r--r--qcom,mmcc-apq8084.h5722logplain -rw-r--r--qcom,mmcc-msm8960.h4109logplain -rw-r--r--qcom,mmcc-msm8974.h5223logplain -rw-r--r--qcom,mmcc-msm8996.h9403logplain -rw-r--r--qcom,rpmcc.h2101logplain -rw-r--r--r7s72100-clock.h1218logplain -rw-r--r--r8a73a4-clock.h1596logplain -rw-r--r--r8a7740-clock.h1992logplain -rw-r--r--r8a7743-cpg-mssr.h1269logplain -rw-r--r--r8a7745-cpg-mssr.h1298logplain -rw-r--r--r8a7778-clock.h1855logplain -rw-r--r--r8a7779-clock.h1647logplain -rw-r--r--r8a7790-clock.h4367logplain -rw-r--r--r8a7791-clock.h4388logplain -rw-r--r--r8a7792-clock.h2562logplain -rw-r--r--r8a7793-clock.h4561logplain -rw-r--r--r8a7794-clock.h3679logplain -rw-r--r--r8a7795-cpg-mssr.h1890logplain -rw-r--r--r8a7796-cpg-mssr.h2066logplain -rw-r--r--renesas-cpg-mssr.h542logplain -rw-r--r--rk1108-cru.h6605logplain -rw-r--r--rk3036-cru.h4584logplain -rw-r--r--rk3066a-cru.h1068logplain -rw-r--r--rk3188-cru-common.h6105logplain -rw-r--r--rk3188-cru.h1435logplain