projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 0376148f | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| f0e5bd41 FB |
2 | /* |
| 3 | * Copyright (C) ST-Ericsson SA 2011-2013 | |
| 4 | * | |
| f0e5bd41 FB |
5 | * Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson |
| 6 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson | |
| 7 | */ | |
| 8 | ||
| 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
| 10 | ||
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/moduleparam.h> | |
| f0e5bd41 FB |
14 | #include <linux/err.h> |
| 15 | #include <linux/uaccess.h> | |
| 16 | #include <linux/watchdog.h> | |
| 17 | #include <linux/platform_device.h> | |
| 18 | #include <linux/platform_data/ux500_wdt.h> | |
| 19 | ||
| 20 | #include <linux/mfd/dbx500-prcmu.h> | |
| 21 | ||
| 22 | #define WATCHDOG_TIMEOUT 600 /* 10 minutes */ | |
| 23 | ||
| 24 | #define WATCHDOG_MIN 0 | |
| 25 | #define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */ | |
| 26 | #define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */ | |
| 27 | ||
| 28 | static unsigned int timeout = WATCHDOG_TIMEOUT; | |
| 29 | module_param(timeout, uint, 0); | |
| 30 | MODULE_PARM_DESC(timeout, | |
| 31 | "Watchdog timeout in seconds. default=" | |
| 32 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); | |
| 33 | ||
| 34 | static bool nowayout = WATCHDOG_NOWAYOUT; | |
| 35 | module_param(nowayout, bool, 0); | |
| 36 | MODULE_PARM_DESC(nowayout, | |
| 37 | "Watchdog cannot be stopped once started (default=" | |
| 38 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
| 39 | ||
| 40 | static int ux500_wdt_start(struct watchdog_device *wdd) | |
| 41 | { | |
| 42 | return prcmu_enable_a9wdog(PRCMU_WDOG_ALL); | |
| 43 | } | |
| 44 | ||
| 45 | static int ux500_wdt_stop(struct watchdog_device *wdd) | |
| 46 | { | |
| 47 | return prcmu_disable_a9wdog(PRCMU_WDOG_ALL); | |
| 48 | } | |
| 49 | ||
| 50 | static int ux500_wdt_keepalive(struct watchdog_device *wdd) | |
| 51 | { | |
| 52 | return prcmu_kick_a9wdog(PRCMU_WDOG_ALL); | |
| 53 | } | |
| 54 | ||
| 55 | static int ux500_wdt_set_timeout(struct watchdog_device *wdd, | |
| 56 | unsigned int timeout) | |
| 57 | { | |
| 58 | ux500_wdt_stop(wdd); | |
| 59 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
| 60 | ux500_wdt_start(wdd); | |
| 61 | ||
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | static const struct watchdog_info ux500_wdt_info = { | |
| 66 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, | |
| 67 | .identity = "Ux500 WDT", | |
| 68 | .firmware_version = 1, | |
| 69 | }; | |
| 70 | ||
| 71 | static const struct watchdog_ops ux500_wdt_ops = { | |
| 72 | .owner = THIS_MODULE, | |
| 73 | .start = ux500_wdt_start, | |
| 74 | .stop = ux500_wdt_stop, | |
| 75 | .ping = ux500_wdt_keepalive, | |
| 76 | .set_timeout = ux500_wdt_set_timeout, | |
| 77 | }; | |
| 78 | ||
| 79 | static struct watchdog_device ux500_wdt = { | |
| 80 | .info = &ux500_wdt_info, | |
| 81 | .ops = &ux500_wdt_ops, | |
| 82 | .min_timeout = WATCHDOG_MIN, | |
| 83 | .max_timeout = WATCHDOG_MAX32, | |
| 84 | }; | |
| 85 | ||
| 86 | static int ux500_wdt_probe(struct platform_device *pdev) | |
| 87 | { | |
| 89e5b7ac | 88 | struct device *dev = &pdev->dev; |
| f0e5bd41 | 89 | int ret; |
| 89e5b7ac | 90 | struct ux500_wdt_data *pdata = dev_get_platdata(dev); |
| f0e5bd41 FB |
91 | |
| 92 | if (pdata) { | |
| 93 | if (pdata->timeout > 0) | |
| 94 | timeout = pdata->timeout; | |
| 95 | if (pdata->has_28_bits_resolution) | |
| 96 | ux500_wdt.max_timeout = WATCHDOG_MAX28; | |
| 97 | } | |
| 98 | ||
| 89e5b7ac | 99 | ux500_wdt.parent = dev; |
| f0e5bd41 FB |
100 | watchdog_set_nowayout(&ux500_wdt, nowayout); |
| 101 | ||
| 102 | /* disable auto off on sleep */ | |
| 103 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); | |
| 104 | ||
| 105 | /* set HW initial value */ | |
| 106 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
| 107 | ||
| 89e5b7ac | 108 | ret = devm_watchdog_register_device(dev, &ux500_wdt); |
| f0e5bd41 FB |
109 | if (ret) |
| 110 | return ret; | |
| 111 | ||
| 89e5b7ac | 112 | dev_info(dev, "initialized\n"); |
| f0e5bd41 FB |
113 | |
| 114 | return 0; | |
| 115 | } | |
| 116 | ||
| 117 | #ifdef CONFIG_PM | |
| 118 | static int ux500_wdt_suspend(struct platform_device *pdev, | |
| 119 | pm_message_t state) | |
| 120 | { | |
| 121 | if (watchdog_active(&ux500_wdt)) { | |
| 122 | ux500_wdt_stop(&ux500_wdt); | |
| 123 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true); | |
| 124 | ||
| 125 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
| 126 | ux500_wdt_start(&ux500_wdt); | |
| 127 | } | |
| 128 | return 0; | |
| 129 | } | |
| 130 | ||
| 131 | static int ux500_wdt_resume(struct platform_device *pdev) | |
| 132 | { | |
| 133 | if (watchdog_active(&ux500_wdt)) { | |
| 134 | ux500_wdt_stop(&ux500_wdt); | |
| 135 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); | |
| 136 | ||
| 137 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
| 138 | ux500_wdt_start(&ux500_wdt); | |
| 139 | } | |
| 140 | return 0; | |
| 141 | } | |
| 142 | #else | |
| 143 | #define ux500_wdt_suspend NULL | |
| 144 | #define ux500_wdt_resume NULL | |
| 145 | #endif | |
| 146 | ||
| 147 | static struct platform_driver ux500_wdt_driver = { | |
| 148 | .probe = ux500_wdt_probe, | |
| f0e5bd41 FB |
149 | .suspend = ux500_wdt_suspend, |
| 150 | .resume = ux500_wdt_resume, | |
| 151 | .driver = { | |
| f0e5bd41 FB |
152 | .name = "ux500_wdt", |
| 153 | }, | |
| 154 | }; | |
| 155 | ||
| 156 | module_platform_driver(ux500_wdt_driver); | |
| 157 | ||
| 158 | MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>"); | |
| 159 | MODULE_DESCRIPTION("Ux500 Watchdog Driver"); | |
| 160 | MODULE_LICENSE("GPL"); | |
| f0e5bd41 | 161 | MODULE_ALIAS("platform:ux500_wdt"); |