2019-06-01 02:09:00 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2014-09-28 16:39:47 -06:00
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/*
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* Watchdog driver for Ricoh RN5T618 PMIC
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*
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* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
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*/
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#include <linux/device.h>
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#include <linux/mfd/rn5t618.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#define DRIVER_NAME "rn5t618-wdt"
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static bool nowayout = WATCHDOG_NOWAYOUT;
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static unsigned int timeout;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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struct rn5t618_wdt {
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struct watchdog_device wdt_dev;
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struct rn5t618 *rn5t618;
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};
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/*
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* This array encodes the values of WDOGTIM field for the supported
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* watchdog expiration times. If the watchdog is not accessed before
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* the timer expiration, the PMU generates an interrupt and if the CPU
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* doesn't clear it within one second the system is restarted.
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*/
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static const struct {
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u8 reg_val;
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unsigned int time;
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} rn5t618_wdt_map[] = {
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{ 0, 1 },
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{ 1, 8 },
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{ 2, 32 },
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{ 3, 128 },
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};
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static int rn5t618_wdt_set_timeout(struct watchdog_device *wdt_dev,
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unsigned int t)
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{
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struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
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int ret, i;
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for (i = 0; i < ARRAY_SIZE(rn5t618_wdt_map); i++) {
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if (rn5t618_wdt_map[i].time + 1 >= t)
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break;
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}
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if (i == ARRAY_SIZE(rn5t618_wdt_map))
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return -EINVAL;
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ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG,
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RN5T618_WATCHDOG_WDOGTIM_M,
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rn5t618_wdt_map[i].reg_val);
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if (!ret)
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wdt_dev->timeout = rn5t618_wdt_map[i].time;
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return ret;
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}
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static int rn5t618_wdt_start(struct watchdog_device *wdt_dev)
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{
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struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
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int ret;
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ret = rn5t618_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
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if (ret)
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return ret;
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/* enable repower-on */
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ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_REPCNT,
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RN5T618_REPCNT_REPWRON,
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RN5T618_REPCNT_REPWRON);
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if (ret)
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return ret;
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/* enable watchdog */
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ret = regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG,
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RN5T618_WATCHDOG_WDOGEN,
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RN5T618_WATCHDOG_WDOGEN);
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if (ret)
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return ret;
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/* enable watchdog interrupt */
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return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIREN,
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RN5T618_PWRIRQ_IR_WDOG,
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RN5T618_PWRIRQ_IR_WDOG);
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}
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static int rn5t618_wdt_stop(struct watchdog_device *wdt_dev)
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{
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struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
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return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_WATCHDOG,
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RN5T618_WATCHDOG_WDOGEN, 0);
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}
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static int rn5t618_wdt_ping(struct watchdog_device *wdt_dev)
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{
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struct rn5t618_wdt *wdt = watchdog_get_drvdata(wdt_dev);
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unsigned int val;
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int ret;
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/* The counter is restarted after a R/W access to watchdog register */
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ret = regmap_read(wdt->rn5t618->regmap, RN5T618_WATCHDOG, &val);
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if (ret)
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return ret;
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ret = regmap_write(wdt->rn5t618->regmap, RN5T618_WATCHDOG, val);
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if (ret)
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return ret;
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/* Clear pending watchdog interrupt */
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return regmap_update_bits(wdt->rn5t618->regmap, RN5T618_PWRIRQ,
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RN5T618_PWRIRQ_IR_WDOG, 0);
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}
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2016-12-26 10:05:11 -07:00
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static const struct watchdog_info rn5t618_wdt_info = {
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2014-09-28 16:39:47 -06:00
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.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
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WDIOF_KEEPALIVEPING,
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.identity = DRIVER_NAME,
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};
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2016-09-01 11:35:26 -06:00
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static const struct watchdog_ops rn5t618_wdt_ops = {
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2014-09-28 16:39:47 -06:00
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.owner = THIS_MODULE,
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.start = rn5t618_wdt_start,
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.stop = rn5t618_wdt_stop,
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.ping = rn5t618_wdt_ping,
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.set_timeout = rn5t618_wdt_set_timeout,
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};
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static int rn5t618_wdt_probe(struct platform_device *pdev)
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{
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2019-04-09 11:23:51 -06:00
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struct device *dev = &pdev->dev;
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struct rn5t618 *rn5t618 = dev_get_drvdata(dev->parent);
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2014-09-28 16:39:47 -06:00
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struct rn5t618_wdt *wdt;
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int min_timeout, max_timeout;
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2019-04-09 11:23:51 -06:00
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wdt = devm_kzalloc(dev, sizeof(struct rn5t618_wdt), GFP_KERNEL);
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2014-09-28 16:39:47 -06:00
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if (!wdt)
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return -ENOMEM;
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min_timeout = rn5t618_wdt_map[0].time;
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max_timeout = rn5t618_wdt_map[ARRAY_SIZE(rn5t618_wdt_map) - 1].time;
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wdt->rn5t618 = rn5t618;
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wdt->wdt_dev.info = &rn5t618_wdt_info;
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wdt->wdt_dev.ops = &rn5t618_wdt_ops;
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wdt->wdt_dev.min_timeout = min_timeout;
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wdt->wdt_dev.max_timeout = max_timeout;
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wdt->wdt_dev.timeout = max_timeout;
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2019-04-09 11:23:51 -06:00
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wdt->wdt_dev.parent = dev;
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2014-09-28 16:39:47 -06:00
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watchdog_set_drvdata(&wdt->wdt_dev, wdt);
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2019-04-09 11:23:51 -06:00
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watchdog_init_timeout(&wdt->wdt_dev, timeout, dev);
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2014-09-28 16:39:47 -06:00
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watchdog_set_nowayout(&wdt->wdt_dev, nowayout);
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platform_set_drvdata(pdev, wdt);
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return watchdog_register_device(&wdt->wdt_dev);
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}
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static int rn5t618_wdt_remove(struct platform_device *pdev)
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{
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struct rn5t618_wdt *wdt = platform_get_drvdata(pdev);
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watchdog_unregister_device(&wdt->wdt_dev);
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return 0;
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}
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static struct platform_driver rn5t618_wdt_driver = {
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.probe = rn5t618_wdt_probe,
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.remove = rn5t618_wdt_remove,
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.driver = {
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.name = DRIVER_NAME,
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},
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};
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module_platform_driver(rn5t618_wdt_driver);
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2019-12-13 14:48:02 -07:00
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MODULE_ALIAS("platform:rn5t618-wdt");
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2014-09-28 16:39:47 -06:00
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MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
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MODULE_DESCRIPTION("RN5T618 watchdog driver");
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MODULE_LICENSE("GPL v2");
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