^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) ST-Ericsson SA 2011-2013
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/platform_data/ux500_wdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/mfd/dbx500-prcmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define WATCHDOG_TIMEOUT 600 /* 10 minutes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define WATCHDOG_MIN 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static unsigned int timeout = WATCHDOG_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) module_param(timeout, uint, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) MODULE_PARM_DESC(timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) "Watchdog timeout in seconds. default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static int ux500_wdt_start(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return prcmu_enable_a9wdog(PRCMU_WDOG_ALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) static int ux500_wdt_stop(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return prcmu_disable_a9wdog(PRCMU_WDOG_ALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int ux500_wdt_keepalive(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return prcmu_kick_a9wdog(PRCMU_WDOG_ALL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int ux500_wdt_set_timeout(struct watchdog_device *wdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) ux500_wdt_stop(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ux500_wdt_start(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static const struct watchdog_info ux500_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) .identity = "Ux500 WDT",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static const struct watchdog_ops ux500_wdt_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .start = ux500_wdt_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .stop = ux500_wdt_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .ping = ux500_wdt_keepalive,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .set_timeout = ux500_wdt_set_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 struct watchdog_device ux500_wdt = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .info = &ux500_wdt_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .ops = &ux500_wdt_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .min_timeout = WATCHDOG_MIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .max_timeout = WATCHDOG_MAX32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) static int ux500_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct ux500_wdt_data *pdata = dev_get_platdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (pdata->timeout > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) timeout = pdata->timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (pdata->has_28_bits_resolution)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) ux500_wdt.max_timeout = WATCHDOG_MAX28;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ux500_wdt.parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) watchdog_set_nowayout(&ux500_wdt, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* disable auto off on sleep */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* set HW initial value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ret = devm_watchdog_register_device(dev, &ux500_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) dev_info(dev, "initialized\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #ifdef CONFIG_PM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static int ux500_wdt_suspend(struct platform_device *pdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) pm_message_t state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (watchdog_active(&ux500_wdt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) ux500_wdt_stop(&ux500_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ux500_wdt_start(&ux500_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static int ux500_wdt_resume(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (watchdog_active(&ux500_wdt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ux500_wdt_stop(&ux500_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ux500_wdt_start(&ux500_wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #define ux500_wdt_suspend NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #define ux500_wdt_resume NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static struct platform_driver ux500_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .probe = ux500_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .suspend = ux500_wdt_suspend,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) .resume = ux500_wdt_resume,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .name = "ux500_wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) module_platform_driver(ux500_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) MODULE_DESCRIPTION("Ux500 Watchdog Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) MODULE_ALIAS("platform:ux500_wdt");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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