text: /*
   *
   * Copyright (c) 2018, NXP
  
   * SPDX-License-Identifier: Apache-2.0
   */
  
  #define DT_DRV_COMPAT nxp_kinetis_wdog
  
  #include <drivers/watchdog.h>
  #include <drivers/clock_control.h>
  #include <fsl_wdog.h>
  
  #define LOG_LEVEL CONFIG_WDT_LOG_LEVEL
  #include <logging/log.h>
  LOG_MODULE_REGISTER(wdt_mcux_wdog);
  
  #define MIN_TIMEOUT 4
  
  struct mcux_wdog_config {
  	WDOG_Type *base;
  	char *clock_name;
  	clock_control_subsys_t clock_subsys;
  	void (*irq_config_func)(struct device *dev);
  };
  
  struct mcux_wdog_data {
  	wdt_callback_t callback;
  	wdog_config_t wdog_config;
  	bool timeout_valid;
  };
  
  static int mcux_wdog_setup(struct device *dev, uint8_t options)
  {
  	const struct mcux_wdog_config *config = dev->config_info;
  	struct mcux_wdog_data *data = dev->driver_data;
  	WDOG_Type *base = config->base;
  
  	if (!data->timeout_valid) {
  		LOG_ERR("No valid timeouts installed");
  		return -EINVAL;
  	}
  
  	data->wdog_config.workMode.enableStop =
  		(options & WDT_OPT_PAUSE_IN_SLEEP) == 0U;
  
  	data->wdog_config.workMode.enableDebug =
  		(options & WDT_OPT_PAUSE_HALTED_BY_DBG) == 0U;
  
  	WDOG_Init(base, &data->wdog_config);
  	LOG_DBG("Setup the watchdog");
  
  	return 0;
  }
  
  static int mcux_wdog_disable(struct device *dev)
  {
  	const struct mcux_wdog_config *config = dev->config_info;
  	struct mcux_wdog_data *data = dev->driver_data;
  	WDOG_Type *base = config->base;
  
  	WDOG_Deinit(base);
  	data->timeout_valid = false;
  	LOG_DBG("Disabled the watchdog");
  
  	return 0;
  }
  
  static int mcux_wdog_install_timeout(struct device *dev,
  				     const struct wdt_timeout_cfg *cfg)
  {
  	const struct mcux_wdog_config *config = dev->config_info;
  	struct mcux_wdog_data *data = dev->driver_data;
  	struct device *clock_dev;
  	uint32_t clock_freq;
  
  	if (data->timeout_valid) {
  		LOG_ERR("No more timeouts can be installed");
  		return -ENOMEM;
  	}
  
  	clock_dev = device_get_binding(config->clock_name);
  	if (clock_dev == NULL) {
  		return -EINVAL;
  	}
  
  	if (clock_control_get_rate(clock_dev, config->clock_subsys,
  				   &clock_freq)) {
  		return -EINVAL;
  	}
  
  	WDOG_GetDefaultConfig(&data->wdog_config);
  
  	data->wdog_config.timeoutValue = clock_freq * cfg->window.max / 1000U;
  
  	if (cfg->window.min) {
  		data->wdog_config.enableWindowMode = true;
  		data->wdog_config.windowValue =
  			clock_freq * cfg->window.min / 1000U;
  	} else {
  		data->wdog_config.enableWindowMode = false;
  		data->wdog_config.windowValue = 0;
  	}
  
  	if ((data->wdog_config.timeoutValue < MIN_TIMEOUT) ||
  	    (data->wdog_config.timeoutValue < data->wdog_config.windowValue)) {
  		LOG_ERR("Invalid timeout");
  		return -EINVAL;
  	}
  
  	data->wdog_config.clockSource = kWDOG_LpoClockSource;
  	data->wdog_config.enableInterrupt = cfg->callback != NULL;
  	data->callback = cfg->callback;
  	data->timeout_valid = true;
  
  	return 0;
  }
  
  static int mcux_wdog_feed(struct device *dev, int channel_id)
  {
  	const struct mcux_wdog_config *config = dev->config_info;
  	WDOG_Type *base = config->base;
  
  	if (channel_id != 0) {
  		LOG_ERR("Invalid channel id");
  		return -EINVAL;
  	}
  
  	WDOG_Refresh(base);
  	LOG_DBG("Fed the watchdog");
  
  	return 0;
  }
  
  static void mcux_wdog_isr(void *arg)
  {
  	struct device *dev = (struct device *)arg;
  	const struct mcux_wdog_config *config = dev->config_info;
  	struct mcux_wdog_data *data = dev->driver_data;
  	WDOG_Type *base = config->base;
  	uint32_t flags;
  
  	flags = WDOG_GetStatusFlags(base);
  	WDOG_ClearStatusFlags(base, flags);
  
  	if (data->callback) {
  		data->callback(dev, 0);
  	}
  }
  
  static int mcux_wdog_init(struct device *dev)
  {
  	const struct mcux_wdog_config *config = dev->config_info;
  
  	config->irq_config_func(dev);
  
  	return 0;
  }
  
  static const struct wdt_driver_api mcux_wdog_api = {
  	.setup = mcux_wdog_setup,
  	.disable = mcux_wdog_disable,
  	.install_timeout = mcux_wdog_install_timeout,
  	.feed = mcux_wdog_feed,
  };
  
  static void mcux_wdog_config_func_0(struct device *dev);
  
  static const struct mcux_wdog_config mcux_wdog_config_0 = {
  	.base = (WDOG_Type *) DT_INST_REG_ADDR(0),
  	.clock_name = DT_INST_CLOCKS_LABEL(0),
  	.clock_subsys = (clock_control_subsys_t)
  		DT_INST_CLOCKS_CELL(0, name),
  	.irq_config_func = mcux_wdog_config_func_0,
  };
  
  static struct mcux_wdog_data mcux_wdog_data_0;
  
  DEVICE_AND_API_INIT(mcux_wdog_0, DT_INST_LABEL(0),
  		    &mcux_wdog_init,
  		    &mcux_wdog_data_0, &mcux_wdog_config_0,
  		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
  		    &mcux_wdog_api);
  
  static void mcux_wdog_config_func_0(struct device *dev)
  {
  	IRQ_CONNECT(DT_INST_IRQN(0),
  		    DT_INST_IRQ(0, priority),
  		    mcux_wdog_isr, DEVICE_GET(mcux_wdog_0), 0);
  
  	irq_enable(DT_INST_IRQN(0));
  }
  