Blame view
drivers/watchdog/imx8_wdt.c
5.23 KB
81f7e3824 Initial Release, ... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 |
/* * Copyright (C) 2017 NXP. * * 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 <linux/arm-smccc.h> #include <linux/io.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/watchdog.h> #include <soc/imx/fsl_sip.h> #include <soc/imx8/sc/sci.h> #include <soc/imx8/sc/svc/irq/api.h> #define DEFAULT_TIMEOUT 60 /* * Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms * in theory, but for normal case, 1s~128s is enough, you can change this max * value in case it's not enough. */ #define MAX_TIMEOUT 128 static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0000); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); static unsigned int timeout = DEFAULT_TIMEOUT; module_param(timeout, uint, 0000); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")"); static struct watchdog_device imx8_wdd; static int imx8_wdt_notify(struct notifier_block *nb, unsigned long event, void *group) { /* ignore other irqs */ if (!(event & SC_IRQ_WDOG && (*(sc_irq_group_t *)group == SC_IRQ_GROUP_WDOG))) return 0; watchdog_notify_pretimeout(&imx8_wdd); return 0; } static int imx8_wdt_ping(struct watchdog_device *wdog) { struct arm_smccc_res res; arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_PING_WDOG, 0, 0, 0, 0, 0, 0, &res); return res.a0; } static int imx8_wdt_start(struct watchdog_device *wdog) { struct arm_smccc_res res; /* no block */ arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_START_WDOG, 0, 0, 0, 0, 0, 0, &res); if (res.a0) return res.a0; return 0; } static int imx8_wdt_stop(struct watchdog_device *wdog) { struct arm_smccc_res res; arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_STOP_WDOG, 0, 0, 0, 0, 0, 0, &res); return res.a0; } static int imx8_wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout) { struct arm_smccc_res res; wdog->timeout = timeout; arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_TIMEOUT_WDOG, timeout * 1000, 0, 0, 0, 0, 0, &res); return res.a0; } static int imx8_wdt_set_pretimeout(struct watchdog_device *wdog, unsigned int new_pretimeout) { struct arm_smccc_res res; arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_PRETIME_WDOG, new_pretimeout * 1000, 0, 0, 0, 0, 0, &res); return res.a0; } static const struct watchdog_ops imx8_wdt_ops = { .owner = THIS_MODULE, .start = imx8_wdt_start, .stop = imx8_wdt_stop, .ping = imx8_wdt_ping, .set_timeout = imx8_wdt_set_timeout, .set_pretimeout = imx8_wdt_set_pretimeout, }; static const struct watchdog_info imx8_wdt_info = { .identity = "i.MX8 watchdog timer", .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE | WDIOF_PRETIMEOUT, }; static struct notifier_block imx8_wdt_notifier = { .notifier_call = imx8_wdt_notify, }; #ifdef CONFIG_PM_SLEEP static int imx8_wdt_suspend(struct device *dev) { if (test_bit(WDOG_ACTIVE, &imx8_wdd.status)) imx8_wdt_stop(&imx8_wdd); return 0; } static int imx8_wdt_resume(struct device *dev) { if (test_bit(WDOG_ACTIVE, &imx8_wdd.status)) imx8_wdt_start(&imx8_wdd); return 0; } static const struct dev_pm_ops imx8_wdt_pm_ops = { .suspend = imx8_wdt_suspend, .resume = imx8_wdt_resume, }; #define IMX8_WDT_PM_OPS (&imx8_wdt_pm_ops) #else #define IMX8_WDT_PM_OPS NULL #endif static int imx8_wdt_probe(struct platform_device *pdev) { struct watchdog_device *wdt = &imx8_wdd; int err; platform_set_drvdata(pdev, wdt); /* init the wdd */ wdt->info = &imx8_wdt_info; wdt->ops = &imx8_wdt_ops; wdt->min_timeout = 1; wdt->max_timeout = MAX_TIMEOUT; wdt->parent = &pdev->dev; watchdog_set_drvdata(wdt, NULL); err = watchdog_init_timeout(wdt, DEFAULT_TIMEOUT, &pdev->dev); if (err) { dev_err(&pdev->dev, "Failed to init the wdog timeout:%d ", err); return err; } err = watchdog_register_device(wdt); if (err) { dev_err(&pdev->dev, "Failed to register watchdog device "); return err; } return register_scu_notifier(&imx8_wdt_notifier); } static int imx8_wdt_remove(struct platform_device *pdev) { struct watchdog_device *wdt = platform_get_drvdata(pdev); imx8_wdt_stop(wdt); watchdog_unregister_device(wdt); return 0; } static void imx8_wdt_shutdown(struct platform_device *pdev) { struct watchdog_device *wdt = platform_get_drvdata(pdev); if (watchdog_active(wdt)) imx8_wdt_stop(wdt); } static const struct of_device_id imx8_wdt_dt_ids[] = { { .compatible = "fsl,imx8-wdt", }, { /*sentinel */ } }; MODULE_DEVICE_TABLE(of, imx8_wdt_dt_ids); static struct platform_driver imx8_wdt_driver = { .probe = imx8_wdt_probe, .remove = imx8_wdt_remove, .shutdown = imx8_wdt_shutdown, .driver = { .name = "imx8-wdt", .of_match_table = imx8_wdt_dt_ids, .pm = IMX8_WDT_PM_OPS, }, }; module_platform_driver(imx8_wdt_driver); MODULE_AUTHOR("Robin Gong <yibin.gong@nxp.com>"); MODULE_DESCRIPTION("NXP i.MX8 watchdog driver"); MODULE_LICENSE("GPL v2"); |