linux/drivers/watchdog/uniphier_wdt.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Watchdog driver for the UniPhier watchdog timer
 *
 * (c) Copyright 2014 Panasonic Corporation
 * (c) Copyright 2016 Socionext Inc.
 * All rights reserved.
 */

#include <linux/bitops.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/watchdog.h>

/* WDT timer setting register */
#define WDTTIMSET …
#define WDTTIMSET_PERIOD_MASK …
#define WDTTIMSET_PERIOD_1_SEC …

/* WDT reset selection register */
#define WDTRSTSEL …
#define WDTRSTSEL_RSTSEL_MASK …
#define WDTRSTSEL_RSTSEL_BOTH …
#define WDTRSTSEL_RSTSEL_IRQ_ONLY …

/* WDT control register */
#define WDTCTRL …
#define WDTCTRL_STATUS …
#define WDTCTRL_CLEAR …
#define WDTCTRL_ENABLE …

#define SEC_TO_WDTTIMSET_PRD(sec) …

#define WDTST_TIMEOUT …

#define WDT_DEFAULT_TIMEOUT …
#define WDT_PERIOD_MIN …
#define WDT_PERIOD_MAX …

static unsigned int timeout = …;
static bool nowayout = … WATCHDOG_NOWAYOUT;

struct uniphier_wdt_dev { … };

/*
 * UniPhier Watchdog operations
 */
static int uniphier_watchdog_ping(struct watchdog_device *w)
{ … }

static int __uniphier_watchdog_start(struct regmap *regmap, unsigned int sec)
{ … }

static int __uniphier_watchdog_stop(struct regmap *regmap)
{ … }

static int __uniphier_watchdog_restart(struct regmap *regmap, unsigned int sec)
{ … }

static int uniphier_watchdog_start(struct watchdog_device *w)
{ … }

static int uniphier_watchdog_stop(struct watchdog_device *w)
{ … }

static int uniphier_watchdog_set_timeout(struct watchdog_device *w,
					 unsigned int t)
{ … }

/*
 * Kernel Interfaces
 */
static const struct watchdog_info uniphier_wdt_info = …;

static const struct watchdog_ops uniphier_wdt_ops = …;

static int uniphier_wdt_probe(struct platform_device *pdev)
{ … }

static const struct of_device_id uniphier_wdt_dt_ids[] = …;
MODULE_DEVICE_TABLE(of, uniphier_wdt_dt_ids);

static struct platform_driver uniphier_wdt_driver = …;

module_platform_driver(…) …;

module_param(timeout, uint, 0000);
MODULE_PARM_DESC(…) …;

module_param(nowayout, bool, 0000);
MODULE_PARM_DESC(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;