/***************************************************************************//**
 * @file 	drv_leuart.c
 * @brief 	LEUART driver of RT-Thread RTOS for EFM32
 * 	COPYRIGHT (C) 2011, RT-Thread Development Team
 * @author 	onelife
 * @version 0.4 beta
 *******************************************************************************
 * @section License
 * The license and distribution terms for this file may be found in the file
 *  LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
 *******************************************************************************
 * @section Change Logs
 * Date			Author		Notes
 * 2011-12-09	onelife		Initial creation for EFM32
 ******************************************************************************/

/***************************************************************************//**
 * @addtogroup efm32
 * @{
 ******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "hdl_interrupt.h"
#include "drv_leuart.h"

#if (defined(RT_USING_LEUART0) || defined(RT_USING_LEUART1))
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#ifdef RT_LEUART_DEBUG
#define leuart_debug(format,args...)        rt_kprintf(format, ##args)
#else
#define leuart_debug(format,args...)
#endif

/* Private variables ---------------------------------------------------------*/
#ifdef RT_USING_LEUART0
#if (RT_USING_LEUART0 >= EFM32_LEUART_LOCATION_COUNT)
	#error "Wrong location number"
#endif
	struct rt_device leuart0_device;
	static struct rt_semaphore leuart0_lock;
#endif

#ifdef RT_USING_LEUART1
#if (RT_USING_LEUART1 >= EFM32_LEUART_LOCATION_COUNT)
	#error "Wrong location number"
#endif
	struct rt_device leuart1_device;
	static struct rt_semaphore leuart1_lock;
#endif

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/***************************************************************************//**
 * @brief
 *   Initialize LEUART device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t rt_leuart_init (rt_device_t dev)
{
	struct efm32_leuart_device_t *leuart;

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);

	if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
	{
		if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
		{
			struct efm32_leuart_dma_mode_t *dma_tx;

			dma_tx = (struct efm32_leuart_dma_mode_t *)(leuart->tx_mode);

			leuart->state |= LEUART_STATE_RX_BUSY;
		}

		if (dev->flag & RT_DEVICE_FLAG_INT_RX)
		{
			struct efm32_leuart_int_mode_t *int_rx;

			int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);

			int_rx->data_ptr = RT_NULL;
		}

		/* Enable LEUART */
		LEUART_Enable(leuart->leuart_device, leuartEnable);

		dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
	}

	return RT_EOK;
}

/***************************************************************************//**
 * @brief
 *   Open LEUART device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @param[in] oflag
 *   Device open flag
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t rt_leuart_open(rt_device_t dev, rt_uint16_t oflag)
{
	RT_ASSERT(dev != RT_NULL);

	struct efm32_leuart_device_t	*leuart;

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);

	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
	{
		IRQn_Type 					rxIrq;

		//if (leuart->state & LEUART_STATE_CONSOLE)
		{	/* Allocate new RX buffer */
			struct efm32_leuart_int_mode_t	*int_mode;

			int_mode = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);

			if ((int_mode->data_ptr = rt_malloc(LEUART_RX_BUFFER_SIZE)) == RT_NULL)
			{
				leuart_debug("LEUART%d err: no mem for RX BUF\n", leuart->unit);
				return -RT_ENOMEM;
			}
			rt_memset(int_mode->data_ptr, 0, LEUART_RX_BUFFER_SIZE);
			int_mode->data_size = LEUART_RX_BUFFER_SIZE;
			int_mode->read_index = 0;
			int_mode->save_index = 0;
		}

		/* Enable RX interrupt */
        leuart->leuart_device->IEN 	= LEUART_IEN_RXDATAV;

		/* Enable IRQ */
		switch (leuart->unit)
		{
		case 0:
            rxIrq   = LEUART0_IRQn;
			break;
		case 1:
            rxIrq   = LEUART1_IRQn;
			break;
		}
		if (oflag != RT_DEVICE_OFLAG_WRONLY)
		{
			NVIC_ClearPendingIRQ(rxIrq);
			NVIC_SetPriority(rxIrq, EFM32_IRQ_PRI_DEFAULT);
			NVIC_EnableIRQ(rxIrq);
		}
	}

    /* Clear Flag */
    leuart->leuart_device->IFC      = _LEUART_IFC_MASK;

	if ((dev->flag & RT_DEVICE_FLAG_DMA_TX) && (oflag != RT_DEVICE_OFLAG_RDONLY))
	{
		/* DMA IRQ is enabled by DMA_Init() */
		NVIC_SetPriority(DMA_IRQn, EFM32_IRQ_PRI_DEFAULT);
	}

	leuart->counter++;
	leuart_debug("LEUART%d: Open with flag %x\n", leuart->unit, oflag);
	return RT_EOK;
}

/***************************************************************************//**
 * @brief
 *   Close LEUART device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @return
 *   Error code
 ******************************************************************************/
static rt_err_t rt_leuart_close(rt_device_t dev)
{
	RT_ASSERT(dev != RT_NULL);

	struct efm32_leuart_device_t    *leuart;

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);

	if (--leuart->counter == 0)
	{
		if (dev->flag & RT_DEVICE_FLAG_INT_RX)
		{
			struct efm32_leuart_int_mode_t *int_rx;

			int_rx = (struct efm32_leuart_int_mode_t *)leuart->rx_mode;

			rt_free(int_rx->data_ptr);
			int_rx->data_ptr = RT_NULL;
		}
	}

	return RT_EOK;
}

/***************************************************************************//**
 * @brief
 *   Read from LEUART device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @param[in] pos
 *   Offset
 *
 * @param[in] buffer
 *   Poniter to the buffer
 *
 * @param[in] size
 *   Buffer size in byte
 *
 * @return
 *   Number of read bytes
 ******************************************************************************/
static rt_size_t rt_leuart_read (
	rt_device_t 	dev,
	rt_off_t 		pos,
	void 			*buffer,
	rt_size_t 		size)
{
	struct efm32_leuart_device_t *leuart;
	rt_uint8_t 	*ptr;
	rt_err_t 	err_code;
	rt_size_t 	read_len;

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);

	/* Lock device */
	if (rt_hw_interrupt_check())
	{
		err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
	}
	else
	{
		err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
	}
	if (err_code != RT_EOK)
	{
		rt_set_errno(err_code);
		return 0;
	}

	if (dev->flag & RT_DEVICE_FLAG_INT_RX)
	{
		ptr = buffer;

		/* interrupt mode Rx */
		while (size)
		{
			rt_base_t level;
			struct efm32_leuart_int_mode_t *int_rx;

			int_rx = (struct efm32_leuart_int_mode_t *)\
				(((struct efm32_leuart_device_t *)(dev->user_data))->rx_mode);

			/* disable interrupt */
			level = rt_hw_interrupt_disable();

			if (int_rx->read_index != int_rx->save_index)
			{
				/* read a character */
				*ptr++ = int_rx->data_ptr[int_rx->read_index];
				size--;

				/* move to next position */
				int_rx->read_index ++;
				if (int_rx->read_index >= LEUART_RX_BUFFER_SIZE)
				{
					int_rx->read_index = 0;
				}
			}
			else
			{
				/* set error code */
				err_code = -RT_EEMPTY;

				/* enable interrupt */
				rt_hw_interrupt_enable(level);
				break;
			}

			/* enable interrupt */
			rt_hw_interrupt_enable(level);
		}

		read_len = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
	}
	else
	{
		LEUART_TypeDef *leuart_device;

		leuart = (struct efm32_leuart_device_t *)(dev->user_data);
		leuart_device = ((struct efm32_leuart_device_t *)(dev->user_data))->leuart_device;
		ptr = buffer;

		/* polling mode */
		while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
		{
			while (leuart_device->STATUS & LEUART_STATUS_RXDATAV)
			{
				*ptr = leuart_device->RXDATA & 0xff;
				ptr ++;
			}
		}

		read_len = size;
	}

	/* Unlock device */
	rt_sem_release(leuart->lock);

	/* set error code */
	rt_set_errno(err_code);
	return read_len;
}

/***************************************************************************//**
 * @brief
 *   Write to LEUART device
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *   Pointer to device descriptor
 *
 * @param[in] pos
 *   Offset
 *
 * @param[in] buffer
 *   Poniter to the buffer
 *
 * @param[in] size
 *   Buffer size in byte
 *
 * @return
 *   Number of written bytes
 ******************************************************************************/
static rt_size_t rt_leuart_write (
	rt_device_t 	dev,
	rt_off_t 		pos,
	const void* 	buffer,
	rt_size_t 		size)
{
	rt_err_t 						err_code;
	rt_size_t 						write_size;
	struct efm32_leuart_device_t* 	leuart;

	write_size = 0;
	leuart = (struct efm32_leuart_device_t*)(dev->user_data);

	/* Lock device */
	if (rt_hw_interrupt_check())
	{
		err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
	}
	else
	{
		err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
	}
	if (err_code != RT_EOK)
	{
		rt_set_errno(err_code);
		return 0;
	}

	if ((dev->flag & RT_DEVICE_FLAG_DMA_TX) && (size > 2))
	{	/* DMA mode Tx */
		struct efm32_leuart_dma_mode_t *dma_tx;

		if (dev->flag & RT_DEVICE_FLAG_STREAM)
		{
			if (*((rt_uint8_t *)buffer + size - 1) == '\n')
			{
				*((rt_uint8_t *)buffer + size - 1) = '\r';
				*((rt_uint8_t *)buffer + size++) = '\n';
				*((rt_uint8_t *)buffer + size) = 0;
			}
		}

		dma_tx = (struct efm32_leuart_dma_mode_t *)(leuart->tx_mode);
		dma_tx->data_ptr = (rt_uint32_t *)buffer;
		dma_tx->data_size = size;

		leuart->state |= LEUART_STATE_TX_BUSY;

		DMA_ActivateBasic(
			dma_tx->dma_channel,
			true,
			false,
			(void *)&(leuart->leuart_device->TXDATA),
			(void *)buffer,
			(rt_uint32_t)(size - 1));

		/* Wait, otherwise the TX buffer is overwrite */
//		if (leuart->state & LEUART_STATE_CONSOLE)
//		{
			while(leuart->state & LEUART_STATE_TX_BUSY);
//		}
//		else
//		{
//			while(leuart->state & LEUART_STATE_TX_BUSY)
//			{
//				rt_thread_sleep(LEUART_WAIT_TIME_TX);
//			}
//		}
// TODO: This function blocks the process
		write_size = size;
	}
	else
	{	/* polling mode */
		rt_uint8_t *ptr = (rt_uint8_t *)buffer;

		if (dev->flag & RT_DEVICE_FLAG_STREAM)
		{
			/* stream mode */
			while (size)
			{
				if (*ptr == '\n')
				{
					while (!(leuart->leuart_device->STATUS & LEUART_STATUS_TXBL));
					leuart->leuart_device->TXDATA = '\r';
				}

				while (!(leuart->leuart_device->STATUS & LEUART_STATUS_TXBL));
				leuart->leuart_device->TXDATA = (rt_uint32_t)*ptr;
				++ptr; --size;
			}
		}
		else
		{
			/* write data directly */
			while (size)
			{
				while (!(leuart->leuart_device->STATUS & LEUART_STATUS_TXBL));
				leuart->leuart_device->TXDATA = (rt_uint32_t)*ptr;
				++ptr; --size;
			}
		}

		write_size = (rt_size_t)ptr - (rt_size_t)buffer;
	}

	/* Unlock device */
	rt_sem_release(leuart->lock);

	/* set error code */
	rt_set_errno(err_code);
	return write_size;
}

/***************************************************************************//**
* @brief
*	Configure LEUART device
*
* @details
*
* @note
*
* @param[in] dev
*	Pointer to device descriptor
*
* @param[in] cmd
*	IIC control command
*
* @param[in] args
*	Arguments
*
* @return
*	Error code
******************************************************************************/
static rt_err_t rt_leuart_control (
	rt_device_t 	dev,
	rt_uint8_t 		cmd,
	void 			*args)
{
	RT_ASSERT(dev != RT_NULL);

	rt_err_t	err_code;
	struct efm32_leuart_device_t *leuart;

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);

	/* Lock device */
	if (rt_hw_interrupt_check())
	{
		err_code = rt_sem_take(leuart->lock, RT_WAITING_NO);
	}
	else
	{
		err_code = rt_sem_take(leuart->lock, RT_WAITING_FOREVER);
	}
	if (err_code != RT_EOK)
	{
		return err_code;
	}

	switch (cmd)
	{
	case RT_DEVICE_CTRL_SUSPEND:
		/* Suspend device */
		dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
		LEUART_Enable(leuart->leuart_device, leuartDisable);
		break;

	case RT_DEVICE_CTRL_RESUME:
		/* Resume device */
		dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
		LEUART_Enable(leuart->leuart_device, leuartEnable);
		break;

	case RT_DEVICE_CTRL_LEUART_RBUFFER:
		/* Set RX buffer */
		{
			struct efm32_leuart_int_mode_t *int_rx;
			rt_uint8_t size;

			int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);
			size = (rt_uint8_t)((rt_uint32_t)args & 0xFFUL);

			/* Free previous RX buffer */
			if (int_rx->data_ptr != RT_NULL)
			{
				if (size == 0)
				{	/* Free RX buffer */
					rt_free(int_rx->data_ptr);
					int_rx->data_ptr = RT_NULL;
				}
				else if (size != int_rx->data_size)
				{
					/* Re-allocate RX buffer */
					if ((int_rx->data_ptr = rt_realloc(int_rx->data_ptr, size)) \
						== RT_NULL)
					{
						leuart_debug("LEUART%d err: no mem for RX BUF\n", leuart->unit);
						err_code = -RT_ENOMEM;
						break;
					}
					// TODO: Is the following line necessary?
					//rt_memset(int_rx->data_ptr, 0, size);
				}
			}
			else
			{
				/* Allocate new RX buffer */
				if ((int_rx->data_ptr = rt_malloc(size)) == RT_NULL)
				{
					leuart_debug("LEUART%d err: no mem for RX BUF\n", leuart->unit);
					err_code = -RT_ENOMEM;
					break;
				}
			}
			int_rx->data_size = size;
			int_rx->read_index = 0;
			int_rx->save_index = 0;
		}
		break;

	}

	/* Unlock device */
	rt_sem_release(leuart->lock);

	return err_code;
}

/***************************************************************************//**
 * @brief
 *	LEUART RX data valid interrupt handler
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *	Pointer to device descriptor
 ******************************************************************************/
void rt_hw_leuart_rx_isr(rt_device_t dev)
{
	struct efm32_leuart_device_t 	*leuart;
	struct efm32_leuart_int_mode_t 	*int_rx;
    rt_uint32_t                     flag;

	/* interrupt mode receive */
	RT_ASSERT(dev->flag & RT_DEVICE_FLAG_INT_RX);

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);
	int_rx = (struct efm32_leuart_int_mode_t *)(leuart->rx_mode);

	RT_ASSERT(int_rx->data_ptr != RT_NULL);

	/* Set status */
	leuart->state |= LEUART_STATE_RX_BUSY;

	/* save into rx buffer */
	while (leuart->leuart_device->STATUS & LEUART_STATUS_RXDATAV)
	{
		rt_base_t level;

		/* disable interrupt */
		level = rt_hw_interrupt_disable();

		/* save character */
		int_rx->data_ptr[int_rx->save_index] = \
			(rt_uint8_t)(leuart->leuart_device->RXDATA & 0xFFUL);
		int_rx->save_index ++;
		if (int_rx->save_index >= LEUART_RX_BUFFER_SIZE)
			int_rx->save_index = 0;

		/* if the next position is read index, discard this 'read char' */
		if (int_rx->save_index == int_rx->read_index)
		{
			int_rx->read_index ++;
			if (int_rx->read_index >= LEUART_RX_BUFFER_SIZE)
			{
				int_rx->read_index = 0;
			}
		}

		/* enable interrupt */
		rt_hw_interrupt_enable(level);
	}

	/* invoke callback */
	if (dev->rx_indicate != RT_NULL)
	{
		rt_size_t rx_length;

		/* get rx length */
		rx_length = int_rx->read_index > int_rx->save_index ?
			LEUART_RX_BUFFER_SIZE - int_rx->read_index + int_rx->save_index : \
			int_rx->save_index - int_rx->read_index;

		dev->rx_indicate(dev, rx_length);
	}
}

/***************************************************************************//**
 * @brief
 *	DMA for LEUART TX interrupt handler
 *
 * @details
 *
 * @note
 *
 * @param[in] dev
 *	Pointer to device descriptor
 ******************************************************************************/
void rt_hw_leuart_dma_tx_isr(rt_device_t dev)
{
	/* DMA mode receive */
	struct efm32_leuart_device_t 	*leuart;
	struct efm32_leuart_dma_mode_t 	*dma_tx;

	RT_ASSERT(dev->flag & RT_DEVICE_FLAG_DMA_TX);

	leuart = (struct efm32_leuart_device_t *)(dev->user_data);
	dma_tx = (struct efm32_leuart_dma_mode_t *)(leuart->tx_mode);

	/* invoke call to notify tx complete */
	if (dev->tx_complete != RT_NULL)
	{
		dev->tx_complete(dev, dma_tx->data_ptr);
	}

	/* Set status */
	leuart->state &= ~(rt_uint32_t)LEUART_STATE_TX_BUSY;
}

/***************************************************************************//**
* @brief
*	Register LEUART device
*
* @details
*
* @note
*
* @param[in] device
*	Pointer to device descriptor
*
* @param[in] name
*	Device name
*
* @param[in] flag
*	Configuration flags
*
* @param[in] leuart
*	Pointer to LEUART device descriptor
*
* @return
*	Error code
******************************************************************************/
rt_err_t rt_hw_leuart_register(
	rt_device_t		device,
	const char		*name,
	rt_uint32_t		flag,
	struct efm32_leuart_device_t *leuart)
{
	RT_ASSERT(device != RT_NULL);

	if ((flag & RT_DEVICE_FLAG_DMA_RX) ||
		(flag & RT_DEVICE_FLAG_INT_TX))
	{
		RT_ASSERT(0);
	}

	device->type 		= RT_Device_Class_Char;
	device->rx_indicate = RT_NULL;
	device->tx_complete = RT_NULL;
	device->init 		= rt_leuart_init;
	device->open		= rt_leuart_open;
	device->close		= rt_leuart_close;
	device->read 		= rt_leuart_read;
	device->write 		= rt_leuart_write;
	device->control 	= rt_leuart_control;
	device->user_data	= leuart;

	/* register a character device */
	return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}

/***************************************************************************//**
* @brief
*	Initialize the specified LEUART unit
*
* @details
*
* @note
*
* @param[in] device
*	Pointer to device descriptor
*
* @param[in] unitNumber
*	Unit number
*
* @param[in] location
*	Pin location number
*
* @param[in] flag
*	Configuration flag
*
* @param[in] dmaChannel
*	DMA channel number for TX
*
* @param[in] console
*	Indicate if using as console
*
* @return
*	Pointer to LEUART device
******************************************************************************/
static struct efm32_leuart_device_t *rt_hw_leuart_unit_init(
	rt_device_t device,
	rt_uint8_t 	unitNumber,
	rt_uint8_t 	location,
	rt_uint32_t flag,
	rt_uint32_t	dmaChannel,
	rt_uint8_t 	config)
{
	struct efm32_leuart_device_t 	*leuart;
	struct efm32_leuart_dma_mode_t	*dma_mode;
	DMA_CB_TypeDef					*callback;
	CMU_Clock_TypeDef				leuartClock;
	rt_uint32_t						txDmaSelect;
	GPIO_Port_TypeDef 				port_tx, port_rx, port_clk, port_cs;
	rt_uint32_t 					pin_tx, pin_rx, pin_clk, pin_cs;
    LEUART_Init_TypeDef             init = LEUART_INIT_DEFAULT;
	efm32_irq_hook_init_t			hook;

	do
	{
		/* Allocate device */
		leuart = rt_malloc(sizeof(struct efm32_leuart_device_t));
		if (leuart == RT_NULL)
		{
			leuart_debug("LEUART%d err: no mem\n", unitNumber);
			break;
		}
		leuart->counter = 0;
		leuart->unit    = unitNumber;
		leuart->state   = config;
		leuart->tx_mode = RT_NULL;
		leuart->rx_mode = RT_NULL;

		/* Allocate TX */
		dma_mode = RT_NULL;
		if (flag & RT_DEVICE_FLAG_DMA_TX)
		{
			leuart->tx_mode = dma_mode = rt_malloc(sizeof(struct efm32_leuart_dma_mode_t));
			if (dma_mode == RT_NULL)
			{
				leuart_debug("LEUART%d err: no mem for DMA TX\n", unitNumber);
				break;
			}
			dma_mode->dma_channel = dmaChannel;
		}

		/* Allocate RX */
		if (flag & RT_DEVICE_FLAG_INT_RX)
		{
			leuart->rx_mode = rt_malloc(sizeof(struct efm32_leuart_int_mode_t));
			if (leuart->rx_mode == RT_NULL)
			{
				leuart_debug("LEUART%d err: no mem for INT RX\n, unitNumber");
				break;
			}
		}

		/* Initialization */
		if (unitNumber >= LEUART_COUNT)
		{
			break;
		}
		switch (unitNumber)
		{
		case 0:
			leuart->leuart_device    = LEUART0;
			leuartClock             = (CMU_Clock_TypeDef)cmuClock_LEUART0;
			txDmaSelect             = DMAREQ_LEUART0_TXBL;
			port_tx                 = AF_LEUART0_TX_PORT(location);
			pin_tx                  = AF_LEUART0_TX_PIN(location);
			port_rx                 = AF_LEUART0_RX_PORT(location);
			pin_rx                  = AF_LEUART0_RX_PIN(location);
			break;

		case 1:
			leuart->leuart_device    = LEUART1;
			leuartClock             = (CMU_Clock_TypeDef)cmuClock_LEUART1;
			txDmaSelect             = DMAREQ_LEUART1_TXBL;
			port_tx                 = AF_LEUART1_TX_PORT(location);
			pin_tx                  = AF_LEUART1_TX_PIN(location);
			port_rx                 = AF_LEUART1_RX_PORT(location);
			pin_rx                  = AF_LEUART1_RX_PIN(location);
			break;

		default:
			break;
		}

        /* Do not prescale clock */
        CMU_ClockDivSet(leuartClock, cmuClkDiv_1);

        /* Enable LEUART clock */
        CMU_ClockEnable(leuartClock, true);

		/* Config GPIO */
		GPIO_PinModeSet(
			port_tx,
			pin_tx,
			gpioModePushPull,
			0);
		GPIO_PinModeSet(
			port_rx,
			pin_rx,
			gpioModeInputPull,
			1);

		/* Config interrupt and NVIC */
		if (flag & RT_DEVICE_FLAG_INT_RX)
		{
			hook.type		= efm32_irq_type_leuart;
			hook.unit		= unitNumber;
			hook.cbFunc 	= rt_hw_leuart_rx_isr;
			hook.userPtr	= device;
			efm32_irq_hook_register(&hook);
		}

		/* Config DMA */
		if (flag & RT_DEVICE_FLAG_DMA_TX)
		{
			DMA_CfgChannel_TypeDef	chnlCfg;
			DMA_CfgDescr_TypeDef	descrCfg;

			hook.type 			= efm32_irq_type_dma;
			hook.unit 			= dmaChannel;
			hook.cbFunc			= rt_hw_leuart_dma_tx_isr;
			hook.userPtr 		= device;
			efm32_irq_hook_register(&hook);

			callback = (DMA_CB_TypeDef *)rt_malloc(sizeof(DMA_CB_TypeDef));
			if (callback == RT_NULL)
			{
				leuart_debug("LEUART%d err: no mem for callback\n", unitNumber);
				break;
			}
			callback->cbFunc	= DMA_IRQHandler_All;
			callback->userPtr	= RT_NULL;
			callback->primary	= 0;

			/* Setting up DMA channel */
			chnlCfg.highPri		= false;	/* Can't use with peripherals */
			chnlCfg.enableInt 	= true;		/* Interrupt for callback function */
			chnlCfg.select 		= txDmaSelect;
			chnlCfg.cb			= callback;
			DMA_CfgChannel(dmaChannel, &chnlCfg);

			/* Setting up DMA channel descriptor */
			descrCfg.dstInc 	= dmaDataIncNone;
			descrCfg.srcInc 	= dmaDataInc1;
			descrCfg.size 		= dmaDataSize1;
			descrCfg.arbRate 	= dmaArbitrate1;
			descrCfg.hprot 		= 0;
			DMA_CfgDescr(dmaChannel, true, &descrCfg);
		}

		/* Init specified LEUART unit */
        LEUART_Init(leuart->leuart_device, &init);

		/* Enable RX and TX pins and set location */
		leuart->leuart_device->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | \
						(location << _LEUART_ROUTE_LOCATION_SHIFT);

		/* Clear RX/TX buffers */
		leuart->leuart_device->CMD = LEUART_CMD_CLEARRX | LEUART_CMD_CLEARTX;

		return leuart;
	} while(0);

	if (leuart->rx_mode)
	{
		rt_free(leuart->rx_mode);
	}
	if (leuart->tx_mode)
	{
		rt_free(leuart->tx_mode);
	}
	if (leuart)
	{
		rt_free(leuart);
	}
	if (callback)
	{
		rt_free(leuart);
	}

    leuart_debug("LEUART%d err: init failed!\n", unitNumber);
	return RT_NULL;
}

/***************************************************************************//**
* @brief
*   Initialize all LEUART module related hardware and register LEUART device to
* kernel
*
* @details
*
* @note
******************************************************************************/
void rt_hw_leuart_init(void)
{
	struct efm32_leuart_device_t    *leuart;
	rt_uint32_t 				    flag;
	rt_uint8_t					    config;

	do
	{
#ifdef RT_USING_LEUART0
        config = 0;
        flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX;

 #if (RT_CONSOLE_DEVICE == EFM_LEUART0)
        config |= LEUART_STATE_CONSOLE;
        flag |= RT_DEVICE_FLAG_STREAM;
 #endif

 #ifdef RT_LEUART0_USING_DMA
        RT_ASSERT(RT_LEUART0_USING_DMA < DMA_CHAN_COUNT);
        flag |= RT_DEVICE_FLAG_DMA_TX;
 #else
       #define RT_LEUART0_USING_DMA EFM32_NO_DMA
 #endif

        /* Initialize and Register leuart0 */
        if ((leuart = rt_hw_leuart_unit_init(
            &leuart0_device,
            0,
            RT_USING_LEUART0,
            flag,
            RT_LEUART0_USING_DMA,
            config)) != RT_NULL)
        {
            rt_hw_leuart_register(&leuart0_device, RT_LEUART0_NAME, flag, leuart);
        }
        else
        {
            break;
        }
        /* Initialize lock for leuart0 */
        leuart->lock = &leuart0_lock;
        if (rt_sem_init(leuart->lock, RT_LEUART0_NAME, 1, RT_IPC_FLAG_FIFO) != RT_EOK)
        {
            break;
        }
#endif

#ifdef RT_USING_LEUART1
        config = 0;
        flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX;

 #if (RT_CONSOLE_DEVICE == EFM_LEUART1)
        config |= LEUART_STATE_CONSOLE;
        flag |= RT_DEVICE_FLAG_STREAM;
 #endif

 #ifdef RT_LEUART1_USING_DMA
        RT_ASSERT(RT_LEUART1_USING_DMA < DMA_CHAN_COUNT);
        flag |= RT_DEVICE_FLAG_DMA_TX;
 #else
       #define RT_LEUART1_USING_DMA EFM32_NO_DMA
 #endif

        /* Initialize and Register leuart1 */
        if ((leuart = rt_hw_leuart_unit_init(
            &leuart1_device,
            1,
            RT_USING_LEUART1,
            flag,
            RT_LEUART1_USING_DMA,
            config)) != RT_NULL)
        {
            rt_hw_leuart_register(&leuart1_device, RT_LEUART1_NAME, flag, leuart);
        }
        else
        {
            break;
        }
        /* Initialize lock for leuart1 */
        leuart->lock = &leuart1_lock;
        if (rt_sem_init(leuart->lock, RT_LEUART1_NAME, 1, RT_IPC_FLAG_FIFO) != RT_EOK)
        {
            break;
        }
#endif

		leuart_debug("LEUART: H/W init OK!\n");
		return;
	} while (0);

	rt_kprintf("LEUART: H/W init failed!\n");
}

#endif /* (defined(RT_USING_LEUART0) || defined(RT_USING_LEUART1)) */
/***************************************************************************//**
 * @}
 ******************************************************************************/