linux/drivers/watchdog/sunxi_wdt.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *      sunxi Watchdog Driver
 *
 *      Copyright (c) 2013 Carlo Caione
 *                    2012 Henrik Nordstrom
 *
 *      Based on xen_wdt.c
 *      (c) Copyright 2010 Novell, Inc.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>

#define WDT_MAX_TIMEOUT …
#define WDT_MIN_TIMEOUT …
#define WDT_TIMEOUT_MASK …

#define WDT_CTRL_RELOAD …

#define WDT_MODE_EN …

#define DRV_NAME …
#define DRV_VERSION …

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

/*
 * This structure stores the register offsets for different variants
 * of Allwinner's watchdog hardware.
 */
struct sunxi_wdt_reg { … };

struct sunxi_wdt_dev { … };

/*
 * wdt_timeout_map maps the watchdog timer interval value in seconds to
 * the value of the register WDT_MODE at bits .wdt_timeout_shift ~ +3
 *
 * [timeout seconds] = register value
 *
 */

static const int wdt_timeout_map[] = …;


static int sunxi_wdt_restart(struct watchdog_device *wdt_dev,
			     unsigned long action, void *data)
{ … }

static int sunxi_wdt_ping(struct watchdog_device *wdt_dev)
{ … }

static int sunxi_wdt_set_timeout(struct watchdog_device *wdt_dev,
		unsigned int timeout)
{ … }

static int sunxi_wdt_stop(struct watchdog_device *wdt_dev)
{ … }

static int sunxi_wdt_start(struct watchdog_device *wdt_dev)
{ … }

static const struct watchdog_info sunxi_wdt_info = …;

static const struct watchdog_ops sunxi_wdt_ops = …;

static const struct sunxi_wdt_reg sun4i_wdt_reg = …;

static const struct sunxi_wdt_reg sun6i_wdt_reg = …;

static const struct sunxi_wdt_reg sun20i_wdt_reg = …;

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

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

static struct platform_driver sunxi_wdt_driver = …;

module_platform_driver(…) …;

module_param(timeout, uint, 0);
MODULE_PARM_DESC(…) …;

module_param(nowayout, bool, 0);
MODULE_PARM_DESC(…) …;

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