Blame view
drivers/watchdog/rn5t618_wdt.c
5.17 KB
22b1c841e watchdog: add dri... |
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 |
/* * Watchdog driver for Ricoh RN5T618 PMIC * * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/device.h> #include <linux/mfd/rn5t618.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/watchdog.h> #define DRIVER_NAME "rn5t618-wdt" static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int timeout; module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds"); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); struct rn5t618_wdt { struct watchdog_device wdt_dev; struct rn5t618 *rn5t618; }; /* * This array encodes the values of WDOGTIM field for the supported * watchdog expiration times. If the watchdog is not accessed before * the timer expiration, the PMU generates an interrupt and if the CPU * doesn't clear it within one second the system is restarted. */ static const struct { u8 reg_val; unsigned int time; } rn5t618_wdt_map[] = { { 0, 1 }, { 1, 8 }, { 2, 32 }, { 3, 128 }, }; static int rn5t618_wdt_set_timeout(struct watchdog_device *wdt_dev, unsigned int t) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); int ret, i; for (i = 0; i < ARRAY_SIZE(rn5t618_wdt_map); i++) { if (rn5t618_wdt_map[i].time + 1 >= t) break; } if (i == ARRAY_SIZE(rn5t618_wdt_map)) return -EINVAL; ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG, RN5T618_WATCHDOG_WDOGTIM_M, rn5t618_wdt_map[i].reg_val); if (!ret) wdt_dev->timeout = rn5t618_wdt_map[i].time; return ret; } static int rn5t618_wdt_start(struct watchdog_device *wdt_dev) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); int ret; ret = rn5t618_wdt_set_timeout(wdt_dev, wdt_dev->timeout); if (ret) return ret; /* enable repower-on */ ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_REPCNT, RN5T618_REPCNT_REPWRON, RN5T618_REPCNT_REPWRON); if (ret) return ret; /* enable watchdog */ ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG, RN5T618_WATCHDOG_WDOGEN, RN5T618_WATCHDOG_WDOGEN); if (ret) return ret; /* enable watchdog interrupt */ return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIREN, RN5T618_PWRIRQ_IR_WDOG, RN5T618_PWRIRQ_IR_WDOG); } static int rn5t618_wdt_stop(struct watchdog_device *wdt_dev) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG, RN5T618_WATCHDOG_WDOGEN, 0); } static int rn5t618_wdt_ping(struct watchdog_device *wdt_dev) { struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev); unsigned int val; int ret; /* The counter is restarted after a R/W access to watchdog register */ ret = regmap_read(wdt->rn5t618->regmap, RN5T618_WATCHDOG, &val); if (ret) return ret; ret = regmap_write(wdt->rn5t618->regmap, RN5T618_WATCHDOG, val); if (ret) return ret; /* Clear pending watchdog interrupt */ return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIRQ, RN5T618_PWRIRQ_IR_WDOG, 0); } static struct watchdog_info rn5t618_wdt_info = { .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .identity = DRIVER_NAME, }; |
85f15cfc2 watchdog: constif... |
138 |
static const struct watchdog_ops rn5t618_wdt_ops = { |
22b1c841e watchdog: add dri... |
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 |
.owner = THIS_MODULE, .start = rn5t618_wdt_start, .stop = rn5t618_wdt_stop, .ping = rn5t618_wdt_ping, .set_timeout = rn5t618_wdt_set_timeout, }; static int rn5t618_wdt_probe(struct platform_device *pdev) { struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent); struct rn5t618_wdt *wdt; int min_timeout, max_timeout; wdt = devm_kzalloc(&pdev->dev, sizeof(struct rn5t618_wdt), GFP_KERNEL); if (!wdt) return -ENOMEM; min_timeout = rn5t618_wdt_map[0].time; max_timeout = rn5t618_wdt_map[ARRAY_SIZE(rn5t618_wdt_map) - 1].time; wdt->rn5t618 = rn5t618; wdt->wdt_dev.info = &rn5t618_wdt_info; wdt->wdt_dev.ops = &rn5t618_wdt_ops; wdt->wdt_dev.min_timeout = min_timeout; wdt->wdt_dev.max_timeout = max_timeout; wdt->wdt_dev.timeout = max_timeout; wdt->wdt_dev.parent = &pdev->dev; watchdog_set_drvdata(&wdt->wdt_dev, wdt); watchdog_init_timeout(&wdt->wdt_dev, timeout, &pdev->dev); watchdog_set_nowayout(&wdt->wdt_dev, nowayout); platform_set_drvdata(pdev, wdt); return watchdog_register_device(&wdt->wdt_dev); } static int rn5t618_wdt_remove(struct platform_device *pdev) { struct rn5t618_wdt *wdt = platform_get_drvdata(pdev); watchdog_unregister_device(&wdt->wdt_dev); return 0; } static struct platform_driver rn5t618_wdt_driver = { .probe = rn5t618_wdt_probe, .remove = rn5t618_wdt_remove, .driver = { .name = DRIVER_NAME, }, }; module_platform_driver(rn5t618_wdt_driver); MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); MODULE_DESCRIPTION("RN5T618 watchdog driver"); MODULE_LICENSE("GPL v2"); |