^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) Nokia Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mfd/twl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int twl4030_wdt_write(unsigned char val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) TWL4030_WATCHDOG_CFG_REG_OFFS);
^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) static int twl4030_wdt_start(struct watchdog_device *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return twl4030_wdt_write(wdt->timeout + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static int twl4030_wdt_stop(struct watchdog_device *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return twl4030_wdt_write(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) wdt->timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static const struct watchdog_info twl4030_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .identity = "TWL4030 Watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static const struct watchdog_ops twl4030_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .start = twl4030_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .stop = twl4030_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .set_timeout = twl4030_wdt_set_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static int twl4030_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct watchdog_device *wdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (!wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) wdt->info = &twl4030_wdt_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) wdt->ops = &twl4030_wdt_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) wdt->status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) wdt->timeout = 30;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) wdt->min_timeout = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) wdt->max_timeout = 30;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) wdt->parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) watchdog_set_nowayout(wdt, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) platform_set_drvdata(pdev, wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) twl4030_wdt_stop(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return devm_watchdog_register_device(dev, wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #ifdef CONFIG_PM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct watchdog_device *wdt = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (watchdog_active(wdt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return twl4030_wdt_stop(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return 0;
^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 int twl4030_wdt_resume(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct watchdog_device *wdt = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (watchdog_active(wdt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return twl4030_wdt_start(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define twl4030_wdt_suspend NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define twl4030_wdt_resume NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static const struct of_device_id twl_wdt_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) { .compatible = "ti,twl4030-wdt", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static struct platform_driver twl4030_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) .probe = twl4030_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) .suspend = twl4030_wdt_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) .resume = twl4030_wdt_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .name = "twl4030_wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) .of_match_table = twl_wdt_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) module_platform_driver(twl4030_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) MODULE_AUTHOR("Nokia Corporation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) MODULE_ALIAS("platform:twl4030_wdt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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