^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Retu watchdog driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2004, 2005 Nokia Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on code written by Amit Kucheria and Michael Buesch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Rewritten by Aaro Koskinen.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/mfd/retu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /* Watchdog timer values in seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define RETU_WDT_MAX_TIMER 63
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct retu_wdt_dev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct retu_dev *rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct delayed_work ping_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Since Retu watchdog cannot be disabled in hardware, we must kick it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * with a timer until userspace watchdog software takes over. If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * CONFIG_WATCHDOG_NOWAYOUT is set, we never start the feeding.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static void retu_wdt_ping_enable(struct retu_wdt_dev *wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) retu_write(wdev->rdev, RETU_REG_WATCHDOG, RETU_WDT_MAX_TIMER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) schedule_delayed_work(&wdev->ping_work,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) round_jiffies_relative(RETU_WDT_MAX_TIMER * HZ / 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static void retu_wdt_ping_disable(struct retu_wdt_dev *wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) retu_write(wdev->rdev, RETU_REG_WATCHDOG, RETU_WDT_MAX_TIMER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) cancel_delayed_work_sync(&wdev->ping_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static void retu_wdt_ping_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct retu_wdt_dev *wdev = container_of(to_delayed_work(work),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct retu_wdt_dev, ping_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) retu_wdt_ping_enable(wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int retu_wdt_start(struct watchdog_device *wdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) retu_wdt_ping_disable(wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int retu_wdt_stop(struct watchdog_device *wdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) retu_wdt_ping_enable(wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int retu_wdt_ping(struct watchdog_device *wdog)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static int retu_wdt_set_timeout(struct watchdog_device *wdog,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) wdog->timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static const struct watchdog_info retu_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .identity = "Retu watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) static const struct watchdog_ops retu_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .start = retu_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .stop = retu_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .ping = retu_wdt_ping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .set_timeout = retu_wdt_set_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int retu_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct watchdog_device *retu_wdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct retu_wdt_dev *wdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) retu_wdt = devm_kzalloc(&pdev->dev, sizeof(*retu_wdt), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!retu_wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!wdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) retu_wdt->info = &retu_wdt_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) retu_wdt->ops = &retu_wdt_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) retu_wdt->timeout = RETU_WDT_MAX_TIMER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) retu_wdt->min_timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) retu_wdt->max_timeout = RETU_WDT_MAX_TIMER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) retu_wdt->parent = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) watchdog_set_drvdata(retu_wdt, wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) watchdog_set_nowayout(retu_wdt, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) wdev->rdev = rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) wdev->dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) INIT_DELAYED_WORK(&wdev->ping_work, retu_wdt_ping_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) ret = watchdog_register_device(retu_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) retu_wdt_ping(retu_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) retu_wdt_ping_enable(wdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) platform_set_drvdata(pdev, retu_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static int retu_wdt_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct watchdog_device *wdog = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) watchdog_unregister_device(wdog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) cancel_delayed_work_sync(&wdev->ping_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static struct platform_driver retu_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .probe = retu_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .remove = retu_wdt_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .name = "retu-wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) module_platform_driver(retu_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) MODULE_ALIAS("platform:retu-wdt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) MODULE_DESCRIPTION("Retu watchdog");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) MODULE_AUTHOR("Amit Kucheria");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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