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140 lines
3.5 KiB
140 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) STMicroelectronics 2018 |
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// Author: Pascal Paillet <[email protected]> for STMicroelectronics. |
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#include <linux/kernel.h> |
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#include <linux/mfd/stpmic1.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/of.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.h> |
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#include <linux/watchdog.h> |
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/* WATCHDOG CONTROL REGISTER bit */ |
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#define WDT_START BIT(0) |
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#define WDT_PING BIT(1) |
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#define WDT_START_MASK BIT(0) |
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#define WDT_PING_MASK BIT(1) |
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#define WDT_STOP 0 |
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#define PMIC_WDT_MIN_TIMEOUT 1 |
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#define PMIC_WDT_MAX_TIMEOUT 256 |
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#define PMIC_WDT_DEFAULT_TIMEOUT 30 |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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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 stpmic1_wdt { |
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struct stpmic1 *pmic; |
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struct watchdog_device wdtdev; |
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}; |
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static int pmic_wdt_start(struct watchdog_device *wdd) |
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{ |
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struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd); |
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return regmap_update_bits(wdt->pmic->regmap, |
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WCHDG_CR, WDT_START_MASK, WDT_START); |
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} |
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static int pmic_wdt_stop(struct watchdog_device *wdd) |
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{ |
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struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd); |
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return regmap_update_bits(wdt->pmic->regmap, |
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WCHDG_CR, WDT_START_MASK, WDT_STOP); |
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} |
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static int pmic_wdt_ping(struct watchdog_device *wdd) |
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{ |
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struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd); |
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return regmap_update_bits(wdt->pmic->regmap, |
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WCHDG_CR, WDT_PING_MASK, WDT_PING); |
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} |
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static int pmic_wdt_set_timeout(struct watchdog_device *wdd, |
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unsigned int timeout) |
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{ |
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struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd); |
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wdd->timeout = timeout; |
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/* timeout is equal to register value + 1 */ |
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return regmap_write(wdt->pmic->regmap, WCHDG_TIMER_CR, timeout - 1); |
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} |
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static const struct watchdog_info pmic_watchdog_info = { |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
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.identity = "STPMIC1 PMIC Watchdog", |
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}; |
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static const struct watchdog_ops pmic_watchdog_ops = { |
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.owner = THIS_MODULE, |
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.start = pmic_wdt_start, |
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.stop = pmic_wdt_stop, |
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.ping = pmic_wdt_ping, |
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.set_timeout = pmic_wdt_set_timeout, |
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}; |
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static int pmic_wdt_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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int ret; |
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struct stpmic1 *pmic; |
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struct stpmic1_wdt *wdt; |
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if (!dev->parent) |
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return -EINVAL; |
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pmic = dev_get_drvdata(dev->parent); |
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if (!pmic) |
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return -EINVAL; |
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wdt = devm_kzalloc(dev, sizeof(struct stpmic1_wdt), GFP_KERNEL); |
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if (!wdt) |
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return -ENOMEM; |
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wdt->pmic = pmic; |
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wdt->wdtdev.info = &pmic_watchdog_info; |
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wdt->wdtdev.ops = &pmic_watchdog_ops; |
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wdt->wdtdev.min_timeout = PMIC_WDT_MIN_TIMEOUT; |
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wdt->wdtdev.max_timeout = PMIC_WDT_MAX_TIMEOUT; |
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wdt->wdtdev.parent = dev; |
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wdt->wdtdev.timeout = PMIC_WDT_DEFAULT_TIMEOUT; |
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watchdog_init_timeout(&wdt->wdtdev, 0, dev); |
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watchdog_set_nowayout(&wdt->wdtdev, nowayout); |
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watchdog_set_drvdata(&wdt->wdtdev, wdt); |
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ret = devm_watchdog_register_device(dev, &wdt->wdtdev); |
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if (ret) |
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return ret; |
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dev_dbg(wdt->pmic->dev, "PMIC Watchdog driver probed\n"); |
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return 0; |
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} |
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static const struct of_device_id of_pmic_wdt_match[] = { |
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{ .compatible = "st,stpmic1-wdt" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, of_pmic_wdt_match); |
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static struct platform_driver stpmic1_wdt_driver = { |
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.probe = pmic_wdt_probe, |
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.driver = { |
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.name = "stpmic1-wdt", |
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.of_match_table = of_pmic_wdt_match, |
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}, |
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}; |
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module_platform_driver(stpmic1_wdt_driver); |
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MODULE_DESCRIPTION("Watchdog driver for STPMIC1 device"); |
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MODULE_AUTHOR("Pascal Paillet <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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