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/*
 * Copyright (c) 2015 Intel Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _WDT_H_
#define _WDT_H_

#include <stdint.h>
#include <device.h>
#include <misc/util.h>

#ifdef __cplusplus
extern "C" {
#endif

#define WDT_MODE		(BIT(1))
#define WDT_MODE_OFFSET         (1)
#define WDT_TIMEOUT_MASK        (0xF)

enum wdt_mode {
	WDT_MODE_RESET = 0,
	WDT_MODE_INTERRUPT_RESET
};

/**
 * WDT clock cycles for timeout type.
 */
enum wdt_clock_timeout_cycles {
	WDT_2_16_CYCLES,
	WDT_2_17_CYCLES,
	WDT_2_18_CYCLES,
	WDT_2_19_CYCLES,
	WDT_2_20_CYCLES,
	WDT_2_21_CYCLES,
	WDT_2_22_CYCLES,
	WDT_2_23_CYCLES,
	WDT_2_24_CYCLES,
	WDT_2_25_CYCLES,
	WDT_2_26_CYCLES,
	WDT_2_27_CYCLES,
	WDT_2_28_CYCLES,
	WDT_2_29_CYCLES,
	WDT_2_30_CYCLES,
	WDT_2_31_CYCLES
};


/**
 * WDT configuration struct.
 */
struct wdt_config {
	uint32_t timeout;
	enum wdt_mode mode;
	void (*interrupt_fn)(struct device *dev);
};

typedef void (*wdt_api_enable)(struct device *dev);
typedef void (*wdt_api_disable)(struct device *dev);
typedef int (*wdt_api_set_config)(struct device *dev,
				  struct wdt_config *config);
typedef void (*wdt_api_get_config)(struct device *dev,
				   struct wdt_config *config);
typedef void (*wdt_api_reload)(struct device *dev);

struct wdt_driver_api {
	wdt_api_enable enable;
	wdt_api_disable disable;
	wdt_api_get_config get_config;
	wdt_api_set_config set_config;
	wdt_api_reload reload;
};

static inline void wdt_enable(struct device *dev)
{
	const struct wdt_driver_api *api = dev->driver_api;

	api->enable(dev);
}

static inline void wdt_disable(struct device *dev)
{
	const struct wdt_driver_api *api = dev->driver_api;

	api->disable(dev);
}

static inline void wdt_get_config(struct device *dev,
				  struct wdt_config *config)
{
	const struct wdt_driver_api *api = dev->driver_api;

	api->get_config(dev, config);
}

static inline int wdt_set_config(struct device *dev,
				 struct wdt_config *config)
{
	const struct wdt_driver_api *api = dev->driver_api;

	return api->set_config(dev, config);
}

static inline void wdt_reload(struct device *dev)
{
	const struct wdt_driver_api *api = dev->driver_api;

	api->reload(dev);
}

#ifdef __cplusplus
}
#endif

#endif