linux/drivers/watchdog/exar_wdt.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *	exar_wdt.c - Driver for the watchdog present in some
 *		     Exar/MaxLinear UART chips like the XR28V38x.
 *
 *	(c) Copyright 2022 D. Müller <[email protected]>.
 *
 */

#define pr_fmt(fmt) …

#include <linux/io.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/watchdog.h>

#define DRV_NAME …

static const unsigned short sio_config_ports[] = …;
static const unsigned char sio_enter_keys[] = …;
#define EXAR_EXIT_KEY …

#define EXAR_LDN …
#define EXAR_DID …
#define EXAR_VID …
#define EXAR_WDT …
#define EXAR_ACT …
#define EXAR_RTBASE …

#define EXAR_WDT_LDEV …

#define EXAR_VEN_ID …
#define EXAR_DEV_382 …
#define EXAR_DEV_384 …

/* WDT runtime registers */
#define WDT_CTRL …
#define WDT_VAL …

#define WDT_UNITS_10MS …
#define WDT_UNITS_SEC …
#define WDT_UNITS_MIN …

/* default WDT control for WDTOUT signal activ / rearm by read */
#define EXAR_WDT_DEF_CONF …

struct wdt_pdev_node { … };

struct wdt_priv { … };

#define WATCHDOG_TIMEOUT …

static int timeout = …;
module_param(timeout, int, 0);
MODULE_PARM_DESC(…) …;

static bool nowayout = … WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(…) …;

static int exar_sio_enter(const unsigned short config_port,
			  const unsigned char key)
{ … }

static void exar_sio_exit(const unsigned short config_port)
{ … }

static unsigned char exar_sio_read(const unsigned short config_port,
				   const unsigned char reg)
{ … }

static void exar_sio_write(const unsigned short config_port,
			   const unsigned char reg, const unsigned char val)
{ … }

static unsigned short exar_sio_read16(const unsigned short config_port,
				      const unsigned char reg)
{ … }

static void exar_sio_select_wdt(const unsigned short config_port)
{ … }

static void exar_wdt_arm(const struct wdt_priv *priv)
{ … }

static void exar_wdt_disarm(const struct wdt_priv *priv)
{ … }

static int exar_wdt_start(struct watchdog_device *wdog)
{ … }

static int exar_wdt_stop(struct watchdog_device *wdog)
{ … }

static int exar_wdt_keepalive(struct watchdog_device *wdog)
{ … }

static int exar_wdt_set_timeout(struct watchdog_device *wdog, unsigned int t)
{ … }

static const struct watchdog_info exar_wdt_info = …;

static const struct watchdog_ops exar_wdt_ops = …;

static int exar_wdt_config(struct watchdog_device *wdog,
			   const unsigned char conf)
{ … }

static int __init exar_wdt_probe(struct platform_device *pdev)
{ … }

static unsigned short __init exar_detect(const unsigned short config_port,
					 const unsigned char key,
					 unsigned short *rt_base)
{ … }

static struct platform_driver exar_wdt_driver = …;

static LIST_HEAD(pdev_list);

static int __init exar_wdt_register(struct wdt_priv *priv, const int idx)
{ … }

static void exar_wdt_unregister(void)
{ … }

static int __init exar_wdt_init(void)
{ … }

static void __exit exar_wdt_exit(void)
{ … }

module_init(…) …;
module_exit(exar_wdt_exit);

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