/* * Watchdog driver for DA9063 PMICs. * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: Mariusz Wojtasik * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include #include /* * Watchdog selector to timeout in seconds. * 0: WDT disabled; * others: timeout = 2048 ms * 2^(TWDSCALE-1). */ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; #define DA9063_TWDSCALE_DISABLE 0 #define DA9063_TWDSCALE_MIN 1 #define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1) #define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN] #define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX] #define DA9063_WDG_TIMEOUT wdt_timeout[3] #define DA9063_RESET_PROTECTION_MS 256 struct da9063_watchdog { struct da9063 *da9063; struct watchdog_device wdtdev; }; static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) { unsigned int i; for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) { if (wdt_timeout[i] >= secs) return i; } return DA9063_TWDSCALE_MAX; } static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval) { return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, DA9063_TWDSCALE_MASK, regval); } static int da9063_wdt_start(struct watchdog_device *wdd) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); unsigned int selector; int ret; selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout); ret = _da9063_wdt_set_timeout(wdt->da9063, selector); if (ret) dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n", ret); return ret; } static int da9063_wdt_stop(struct watchdog_device *wdd) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D, DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE); if (ret) dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n", ret); return ret; } static int da9063_wdt_ping(struct watchdog_device *wdd) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, DA9063_WATCHDOG); if (ret) dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n", ret); return ret; } static int da9063_wdt_set_timeout(struct watchdog_device *wdd, unsigned int timeout) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); unsigned int selector; int ret; selector = da9063_wdt_timeout_to_sel(timeout); ret = _da9063_wdt_set_timeout(wdt->da9063, selector); if (ret) dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n", ret); else wdd->timeout = wdt_timeout[selector]; return ret; } static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action, void *data) { struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, DA9063_SHUTDOWN); if (ret) dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n", ret); return ret; } static const struct watchdog_info da9063_watchdog_info = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "DA9063 Watchdog", }; static const struct watchdog_ops da9063_watchdog_ops = { .owner = THIS_MODULE, .start = da9063_wdt_start, .stop = da9063_wdt_stop, .ping = da9063_wdt_ping, .set_timeout = da9063_wdt_set_timeout, .restart = da9063_wdt_restart, }; static int da9063_wdt_probe(struct platform_device *pdev) { int ret; struct da9063 *da9063; struct da9063_watchdog *wdt; if (!pdev->dev.parent) return -EINVAL; da9063 = dev_get_drvdata(pdev->dev.parent); if (!da9063) return -EINVAL; wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; wdt->da9063 = da9063; wdt->wdtdev.info = &da9063_watchdog_info; wdt->wdtdev.ops = &da9063_watchdog_ops; wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT; wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT; wdt->wdtdev.min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS; wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT; wdt->wdtdev.parent = &pdev->dev; wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS; watchdog_set_restart_priority(&wdt->wdtdev, 128); watchdog_set_drvdata(&wdt->wdtdev, wdt); dev_set_drvdata(&pdev->dev, wdt); ret = watchdog_register_device(&wdt->wdtdev); if (ret) return ret; return 0; } static int da9063_wdt_remove(struct platform_device *pdev) { struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev); watchdog_unregister_device(&wdt->wdtdev); return 0; } static struct platform_driver da9063_wdt_driver = { .probe = da9063_wdt_probe, .remove = da9063_wdt_remove, .driver = { .name = DA9063_DRVNAME_WATCHDOG, }, }; module_platform_driver(da9063_wdt_driver); MODULE_AUTHOR("Mariusz Wojtasik "); MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG); -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