drivers/serial/uart_mcux.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017, NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #include <errno.h>
 #include <device.h>
 #include <drivers/uart.h>
 #include <drivers/clock_control.h>
 #include <fsl_uart.h>
 #include <soc.h>

 struct uart_mcux_config {
 	UART_Type *base;
 	char *clock_name;
 	clock_control_subsys_t clock_subsys;
 	u32_t baud_rate;
 	u8_t hw_flow_control;
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	void (*irq_config_func)(struct device *dev);
 #endif
 };

 struct uart_mcux_data {
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	uart_irq_callback_user_data_t callback;
 	void *cb_data;
 #endif
 };

 static int uart_mcux_poll_in(struct device *dev, unsigned char *c)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t flags = UART_GetStatusFlags(config->base);
 	int ret = -1;

 	if (flags & kUART_RxDataRegFullFlag) {
 		*c = UART_ReadByte(config->base);
 		ret = 0;
 	}

 	return ret;
 }

 static void uart_mcux_poll_out(struct device *dev, unsigned char c)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;

 	while (!(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {
 	}

 	UART_WriteByte(config->base, c);
 }

 static int uart_mcux_err_check(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t flags = UART_GetStatusFlags(config->base);
 	int err = 0;

 	if (flags & kUART_RxOverrunFlag) {
 		err |= UART_ERROR_OVERRUN;
 	}

 	if (flags & kUART_ParityErrorFlag) {
 		err |= UART_ERROR_PARITY;
 	}

 	if (flags & kUART_FramingErrorFlag) {
 		err |= UART_ERROR_FRAMING;
 	}

 	UART_ClearStatusFlags(config->base, kUART_RxOverrunFlag |
 					    kUART_ParityErrorFlag |
 					    kUART_FramingErrorFlag);

 	return err;
 }

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static int uart_mcux_fifo_fill(struct device *dev, const u8_t *tx_data,
 			       int len)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u8_t num_tx = 0U;

 	while ((len - num_tx > 0) &&
 	       (UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {

 		UART_WriteByte(config->base, tx_data[num_tx++]);
 	}

 	return num_tx;
 }

 static int uart_mcux_fifo_read(struct device *dev, u8_t *rx_data,
 			       const int len)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u8_t num_rx = 0U;

 	while ((len - num_rx > 0) &&
 	       (UART_GetStatusFlags(config->base) & kUART_RxDataRegFullFlag)) {

 		rx_data[num_rx++] = UART_ReadByte(config->base);
 	}

 	return num_rx;
 }

 static void uart_mcux_irq_tx_enable(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_TxDataRegEmptyInterruptEnable;

 	UART_EnableInterrupts(config->base, mask);
 }

 static void uart_mcux_irq_tx_disable(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_TxDataRegEmptyInterruptEnable;

 	UART_DisableInterrupts(config->base, mask);
 }

 static int uart_mcux_irq_tx_complete(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t flags = UART_GetStatusFlags(config->base);

 	return (flags & kUART_TxDataRegEmptyFlag) != 0U;
 }

 static int uart_mcux_irq_tx_ready(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_TxDataRegEmptyInterruptEnable;

 	return (UART_GetEnabledInterrupts(config->base) & mask)
 		&& uart_mcux_irq_tx_complete(dev);
 }

 static void uart_mcux_irq_rx_enable(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_RxDataRegFullInterruptEnable;

 	UART_EnableInterrupts(config->base, mask);
 }

 static void uart_mcux_irq_rx_disable(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_RxDataRegFullInterruptEnable;

 	UART_DisableInterrupts(config->base, mask);
 }

 static int uart_mcux_irq_rx_full(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t flags = UART_GetStatusFlags(config->base);

 	return (flags & kUART_RxDataRegFullFlag) != 0U;
 }

 static int uart_mcux_irq_rx_ready(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_RxDataRegFullInterruptEnable;

 	return (UART_GetEnabledInterrupts(config->base) & mask)
 		&& uart_mcux_irq_rx_full(dev);
 }

 static void uart_mcux_irq_err_enable(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_NoiseErrorInterruptEnable |
 			kUART_FramingErrorInterruptEnable |
 			kUART_ParityErrorInterruptEnable;

 	UART_EnableInterrupts(config->base, mask);
 }

 static void uart_mcux_irq_err_disable(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	u32_t mask = kUART_NoiseErrorInterruptEnable |
 			kUART_FramingErrorInterruptEnable |
 			kUART_ParityErrorInterruptEnable;

 	UART_DisableInterrupts(config->base, mask);
 }

 static int uart_mcux_irq_is_pending(struct device *dev)
 {
 	return uart_mcux_irq_tx_ready(dev) || uart_mcux_irq_rx_ready(dev);
 }

 static int uart_mcux_irq_update(struct device *dev)
 {
 	return 1;
 }

 static void uart_mcux_irq_callback_set(struct device *dev,
 				       uart_irq_callback_user_data_t cb,
 				       void *cb_data)
 {
 	struct uart_mcux_data *data = dev->driver_data;

 	data->callback = cb;
 	data->cb_data = cb_data;
 }

 static void uart_mcux_isr(void *arg)
 {
 	struct device *dev = arg;
 	struct uart_mcux_data *data = dev->driver_data;

 	if (data->callback) {
 		data->callback(data->cb_data);
 	}
 }
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 static int uart_mcux_init(struct device *dev)
 {
 	const struct uart_mcux_config *config = dev->config->config_info;
 	uart_config_t uart_config;
 	struct device *clock_dev;
 	u32_t clock_freq;

 	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;
 	}

 	UART_GetDefaultConfig(&uart_config);
 	uart_config.enableTx = true;
 	uart_config.enableRx = true;
 	if (config->hw_flow_control) {
 		uart_config.enableRxRTS = true;
 		uart_config.enableTxCTS = true;
 	}
 	uart_config.baudRate_Bps = config->baud_rate;

 	UART_Init(config->base, &uart_config, clock_freq);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	config->irq_config_func(dev);
 #endif

 	return 0;
 }

 static const struct uart_driver_api uart_mcux_driver_api = {
 	.poll_in = uart_mcux_poll_in,
 	.poll_out = uart_mcux_poll_out,
 	.err_check = uart_mcux_err_check,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.fifo_fill = uart_mcux_fifo_fill,
 	.fifo_read = uart_mcux_fifo_read,
 	.irq_tx_enable = uart_mcux_irq_tx_enable,
 	.irq_tx_disable = uart_mcux_irq_tx_disable,
 	.irq_tx_complete = uart_mcux_irq_tx_complete,
 	.irq_tx_ready = uart_mcux_irq_tx_ready,
 	.irq_rx_enable = uart_mcux_irq_rx_enable,
 	.irq_rx_disable = uart_mcux_irq_rx_disable,
 	.irq_rx_ready = uart_mcux_irq_rx_ready,
 	.irq_err_enable = uart_mcux_irq_err_enable,
 	.irq_err_disable = uart_mcux_irq_err_disable,
 	.irq_is_pending = uart_mcux_irq_is_pending,
 	.irq_update = uart_mcux_irq_update,
 	.irq_callback_set = uart_mcux_irq_callback_set,
 #endif
 };

 #ifdef CONFIG_UART_MCUX_0

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_0(struct device *dev);
 #endif

 static const struct uart_mcux_config uart_mcux_0_config = {
 	.base = UART0,
 	.clock_name = DT_UART_MCUX_0_CLOCK_NAME,
 	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_0_CLOCK_SUBSYS,
 	.baud_rate = DT_UART_MCUX_0_BAUD_RATE,
 	.hw_flow_control = DT_UART_MCUX_0_HW_FLOW_CONTROL,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.irq_config_func = uart_mcux_config_func_0,
 #endif
 };

 static struct uart_mcux_data uart_mcux_0_data;

 DEVICE_AND_API_INIT(uart_0, DT_UART_MCUX_0_NAME,
 		    &uart_mcux_init,
 		    &uart_mcux_0_data, &uart_mcux_0_config,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_mcux_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_0(struct device *dev)
 {
 	IRQ_CONNECT(DT_UART_MCUX_0_IRQ_STATUS,
 		    DT_UART_MCUX_0_IRQ_STATUS_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_0), 0);

 	irq_enable(DT_UART_MCUX_0_IRQ_STATUS);

 	IRQ_CONNECT(DT_UART_MCUX_0_IRQ_ERROR,
 		    DT_UART_MCUX_0_IRQ_ERROR_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_0), 0);

 	irq_enable(DT_UART_MCUX_0_IRQ_ERROR);
 }
 #endif

 #endif /* CONFIG_UART_MCUX_0 */

 #ifdef CONFIG_UART_MCUX_1

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_1(struct device *dev);
 #endif

 static const struct uart_mcux_config uart_mcux_1_config = {
 	.base = UART1,
 	.clock_name = DT_UART_MCUX_1_CLOCK_NAME,
 	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_1_CLOCK_SUBSYS,
 	.baud_rate = DT_UART_MCUX_1_BAUD_RATE,
 	.hw_flow_control = DT_UART_MCUX_1_HW_FLOW_CONTROL,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.irq_config_func = uart_mcux_config_func_1,
 #endif
 };

 static struct uart_mcux_data uart_mcux_1_data;

 DEVICE_AND_API_INIT(uart_1, DT_UART_MCUX_1_NAME,
 		    &uart_mcux_init,
 		    &uart_mcux_1_data, &uart_mcux_1_config,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_mcux_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_1(struct device *dev)
 {
 	IRQ_CONNECT(DT_UART_MCUX_1_IRQ_STATUS,
 		    DT_UART_MCUX_1_IRQ_STATUS_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_1), 0);

 	irq_enable(DT_UART_MCUX_1_IRQ_STATUS);

 	IRQ_CONNECT(DT_UART_MCUX_1_IRQ_ERROR,
 		    DT_UART_MCUX_1_IRQ_ERROR_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_1), 0);

 	irq_enable(DT_UART_MCUX_1_IRQ_ERROR);
 }
 #endif

 #endif /* CONFIG_UART_MCUX_1 */

 #ifdef CONFIG_UART_MCUX_2

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_2(struct device *dev);
 #endif

 static const struct uart_mcux_config uart_mcux_2_config = {
 	.base = UART2,
 	.clock_name = DT_UART_MCUX_2_CLOCK_NAME,
 	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_2_CLOCK_SUBSYS,
 	.baud_rate = DT_UART_MCUX_2_BAUD_RATE,
 	.hw_flow_control = DT_UART_MCUX_2_HW_FLOW_CONTROL,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.irq_config_func = uart_mcux_config_func_2,
 #endif
 };

 static struct uart_mcux_data uart_mcux_2_data;

 DEVICE_AND_API_INIT(uart_2, DT_UART_MCUX_2_NAME,
 		    &uart_mcux_init,
 		    &uart_mcux_2_data, &uart_mcux_2_config,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_mcux_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_2(struct device *dev)
 {
 	IRQ_CONNECT(DT_UART_MCUX_2_IRQ_STATUS,
 		    DT_UART_MCUX_2_IRQ_STATUS_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_2), 0);

 	irq_enable(DT_UART_MCUX_2_IRQ_STATUS);

 	IRQ_CONNECT(DT_UART_MCUX_2_IRQ_ERROR,
 		    DT_UART_MCUX_2_IRQ_ERROR_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_2), 0);

 	irq_enable(DT_UART_MCUX_2_IRQ_ERROR);
 }
 #endif

 #endif /* CONFIG_UART_MCUX_2 */

 #ifdef CONFIG_UART_MCUX_3

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_3(struct device *dev);
 #endif

 static const struct uart_mcux_config uart_mcux_3_config = {
 	.base = UART3,
 	.clock_name = DT_UART_MCUX_3_CLOCK_NAME,
 	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_3_CLOCK_SUBSYS,
 	.baud_rate = DT_UART_MCUX_3_BAUD_RATE,
 	.hw_flow_control = DT_UART_MCUX_3_HW_FLOW_CONTROL,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.irq_config_func = uart_mcux_config_func_3,
 #endif
 };

 static struct uart_mcux_data uart_mcux_3_data;

 DEVICE_AND_API_INIT(uart_3, DT_UART_MCUX_3_NAME,
 		    &uart_mcux_init,
 		    &uart_mcux_3_data, &uart_mcux_3_config,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_mcux_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_3(struct device *dev)
 {
 	IRQ_CONNECT(DT_UART_MCUX_3_IRQ_STATUS,
 		    DT_UART_MCUX_3_IRQ_STATUS_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_3), 0);

 	irq_enable(DT_UART_MCUX_3_IRQ_STATUS);

 	IRQ_CONNECT(DT_UART_MCUX_3_IRQ_ERROR,
 		    DT_UART_MCUX_3_IRQ_ERROR_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_3), 0);

 	irq_enable(DT_UART_MCUX_3_IRQ_ERROR);
 }
 #endif

 #endif /* CONFIG_UART_MCUX_3 */

 #ifdef CONFIG_UART_MCUX_4

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_4(struct device *dev);
 #endif

 static const struct uart_mcux_config uart_mcux_4_config = {
 	.base = UART4,
 	.clock_name = DT_UART_MCUX_4_CLOCK_NAME,
 	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_4_CLOCK_SUBSYS,
 	.baud_rate = DT_UART_MCUX_4_BAUD_RATE,
 	.hw_flow_control = DT_UART_MCUX_4_HW_FLOW_CONTROL,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.irq_config_func = uart_mcux_config_func_4,
 #endif
 };

 static struct uart_mcux_data uart_mcux_4_data;

 DEVICE_AND_API_INIT(uart_4, DT_UART_MCUX_4_NAME,
 		    &uart_mcux_init,
 		    &uart_mcux_4_data, &uart_mcux_4_config,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_mcux_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_4(struct device *dev)
 {
 	IRQ_CONNECT(DT_UART_MCUX_4_IRQ_STATUS,
 		    DT_UART_MCUX_4_IRQ_STATUS_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_4), 0);

 	irq_enable(DT_UART_MCUX_4_IRQ_STATUS);

 	IRQ_CONNECT(DT_UART_MCUX_4_IRQ_ERROR,
 		    DT_UART_MCUX_4_IRQ_ERROR_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_4), 0);

 	irq_enable(DT_UART_MCUX_4_IRQ_ERROR);
 }
 #endif

 #endif /* CONFIG_UART_MCUX_4 */

 #ifdef CONFIG_UART_MCUX_5

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_5(struct device *dev);
 #endif

 static const struct uart_mcux_config uart_mcux_5_config = {
 	.base = UART5,
 	.clock_name = DT_UART_MCUX_5_CLOCK_NAME,
 	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_5_CLOCK_SUBSYS,
 	.baud_rate = DT_UART_MCUX_5_BAUD_RATE,
 	.hw_flow_control = DT_UART_MCUX_5_HW_FLOW_CONTROL,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.irq_config_func = uart_mcux_config_func_5,
 #endif
 };

 static struct uart_mcux_data uart_mcux_5_data;

 DEVICE_AND_API_INIT(uart_5, DT_UART_MCUX_5_NAME,
 		    &uart_mcux_init,
 		    &uart_mcux_5_data, &uart_mcux_5_config,
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
 		    &uart_mcux_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_mcux_config_func_5(struct device *dev)
 {
 	IRQ_CONNECT(DT_UART_MCUX_5_IRQ_STATUS,
 		    DT_UART_MCUX_5_IRQ_STATUS_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_5), 0);

 	irq_enable(DT_UART_MCUX_5_IRQ_STATUS);

 	IRQ_CONNECT(DT_UART_MCUX_5_IRQ_ERROR,
 		    DT_UART_MCUX_5_IRQ_ERROR_PRI,
 		    uart_mcux_isr, DEVICE_GET(uart_5), 0);

 	irq_enable(DT_UART_MCUX_5_IRQ_ERROR);
 }
 #endif

 #endif /* CONFIG_UART_MCUX_5 */
	/*
	* Copyright (c) 2017, NXP
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#include <errno.h>
	#include <device.h>
	#include <drivers/uart.h>
	#include <drivers/clock_control.h>
	#include <fsl_uart.h>
	#include <soc.h>

	struct uart_mcux_config {
	UART_Type *base;
	char *clock_name;
	clock_control_subsys_t clock_subsys;
	u32_t baud_rate;
	u8_t hw_flow_control;
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	void (irq_config_func)(struct device dev);
	#endif
	};

	struct uart_mcux_data {
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	uart_irq_callback_user_data_t callback;
	void *cb_data;
	#endif
	};

	static int uart_mcux_poll_in(struct device dev, unsigned char c)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t flags = UART_GetStatusFlags(config->base);
	int ret = -1;

	if (flags & kUART_RxDataRegFullFlag) {
	*c = UART_ReadByte(config->base);
	ret = 0;
	}

	return ret;
	}

	static void uart_mcux_poll_out(struct device *dev, unsigned char c)
	{
	const struct uart_mcux_config *config = dev->config->config_info;

	while (!(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {
	}

	UART_WriteByte(config->base, c);
	}

	static int uart_mcux_err_check(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t flags = UART_GetStatusFlags(config->base);
	int err = 0;

	if (flags & kUART_RxOverrunFlag) {
	err \|= UART_ERROR_OVERRUN;
	}

	if (flags & kUART_ParityErrorFlag) {
	err \|= UART_ERROR_PARITY;
	}

	if (flags & kUART_FramingErrorFlag) {
	err \|= UART_ERROR_FRAMING;
	}

	UART_ClearStatusFlags(config->base, kUART_RxOverrunFlag \|
	kUART_ParityErrorFlag \|
	kUART_FramingErrorFlag);

	return err;
	}

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static int uart_mcux_fifo_fill(struct device dev, const u8_t tx_data,
	int len)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u8_t num_tx = 0U;

	while ((len - num_tx > 0) &&
	(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {

	UART_WriteByte(config->base, tx_data[num_tx++]);
	}

	return num_tx;
	}

	static int uart_mcux_fifo_read(struct device dev, u8_t rx_data,
	const int len)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u8_t num_rx = 0U;

	while ((len - num_rx > 0) &&
	(UART_GetStatusFlags(config->base) & kUART_RxDataRegFullFlag)) {

	rx_data[num_rx++] = UART_ReadByte(config->base);
	}

	return num_rx;
	}

	static void uart_mcux_irq_tx_enable(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_TxDataRegEmptyInterruptEnable;

	UART_EnableInterrupts(config->base, mask);
	}

	static void uart_mcux_irq_tx_disable(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_TxDataRegEmptyInterruptEnable;

	UART_DisableInterrupts(config->base, mask);
	}

	static int uart_mcux_irq_tx_complete(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t flags = UART_GetStatusFlags(config->base);

	return (flags & kUART_TxDataRegEmptyFlag) != 0U;
	}

	static int uart_mcux_irq_tx_ready(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_TxDataRegEmptyInterruptEnable;

	return (UART_GetEnabledInterrupts(config->base) & mask)
	&& uart_mcux_irq_tx_complete(dev);
	}

	static void uart_mcux_irq_rx_enable(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_RxDataRegFullInterruptEnable;

	UART_EnableInterrupts(config->base, mask);
	}

	static void uart_mcux_irq_rx_disable(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_RxDataRegFullInterruptEnable;

	UART_DisableInterrupts(config->base, mask);
	}

	static int uart_mcux_irq_rx_full(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t flags = UART_GetStatusFlags(config->base);

	return (flags & kUART_RxDataRegFullFlag) != 0U;
	}

	static int uart_mcux_irq_rx_ready(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_RxDataRegFullInterruptEnable;

	return (UART_GetEnabledInterrupts(config->base) & mask)
	&& uart_mcux_irq_rx_full(dev);
	}

	static void uart_mcux_irq_err_enable(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_NoiseErrorInterruptEnable \|
	kUART_FramingErrorInterruptEnable \|
	kUART_ParityErrorInterruptEnable;

	UART_EnableInterrupts(config->base, mask);
	}

	static void uart_mcux_irq_err_disable(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	u32_t mask = kUART_NoiseErrorInterruptEnable \|
	kUART_FramingErrorInterruptEnable \|
	kUART_ParityErrorInterruptEnable;

	UART_DisableInterrupts(config->base, mask);
	}

	static int uart_mcux_irq_is_pending(struct device *dev)
	{
	return uart_mcux_irq_tx_ready(dev) \|\| uart_mcux_irq_rx_ready(dev);
	}

	static int uart_mcux_irq_update(struct device *dev)
	{
	return 1;
	}

	static void uart_mcux_irq_callback_set(struct device *dev,
	uart_irq_callback_user_data_t cb,
	void *cb_data)
	{
	struct uart_mcux_data *data = dev->driver_data;

	data->callback = cb;
	data->cb_data = cb_data;
	}

	static void uart_mcux_isr(void *arg)
	{
	struct device *dev = arg;
	struct uart_mcux_data *data = dev->driver_data;

	if (data->callback) {
	data->callback(data->cb_data);
	}
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static int uart_mcux_init(struct device *dev)
	{
	const struct uart_mcux_config *config = dev->config->config_info;
	uart_config_t uart_config;
	struct device *clock_dev;
	u32_t clock_freq;

	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;
	}

	UART_GetDefaultConfig(&uart_config);
	uart_config.enableTx = true;
	uart_config.enableRx = true;
	if (config->hw_flow_control) {
	uart_config.enableRxRTS = true;
	uart_config.enableTxCTS = true;
	}
	uart_config.baudRate_Bps = config->baud_rate;

	UART_Init(config->base, &uart_config, clock_freq);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	config->irq_config_func(dev);
	#endif

	return 0;
	}

	static const struct uart_driver_api uart_mcux_driver_api = {
	.poll_in = uart_mcux_poll_in,
	.poll_out = uart_mcux_poll_out,
	.err_check = uart_mcux_err_check,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.fifo_fill = uart_mcux_fifo_fill,
	.fifo_read = uart_mcux_fifo_read,
	.irq_tx_enable = uart_mcux_irq_tx_enable,
	.irq_tx_disable = uart_mcux_irq_tx_disable,
	.irq_tx_complete = uart_mcux_irq_tx_complete,
	.irq_tx_ready = uart_mcux_irq_tx_ready,
	.irq_rx_enable = uart_mcux_irq_rx_enable,
	.irq_rx_disable = uart_mcux_irq_rx_disable,
	.irq_rx_ready = uart_mcux_irq_rx_ready,
	.irq_err_enable = uart_mcux_irq_err_enable,
	.irq_err_disable = uart_mcux_irq_err_disable,
	.irq_is_pending = uart_mcux_irq_is_pending,
	.irq_update = uart_mcux_irq_update,
	.irq_callback_set = uart_mcux_irq_callback_set,
	#endif
	};

	#ifdef CONFIG_UART_MCUX_0

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_0(struct device *dev);
	#endif

	static const struct uart_mcux_config uart_mcux_0_config = {
	.base = UART0,
	.clock_name = DT_UART_MCUX_0_CLOCK_NAME,
	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_0_CLOCK_SUBSYS,
	.baud_rate = DT_UART_MCUX_0_BAUD_RATE,
	.hw_flow_control = DT_UART_MCUX_0_HW_FLOW_CONTROL,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_mcux_config_func_0,
	#endif
	};

	static struct uart_mcux_data uart_mcux_0_data;

	DEVICE_AND_API_INIT(uart_0, DT_UART_MCUX_0_NAME,
	&uart_mcux_init,
	&uart_mcux_0_data, &uart_mcux_0_config,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_mcux_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_0(struct device *dev)
	{
	IRQ_CONNECT(DT_UART_MCUX_0_IRQ_STATUS,
	DT_UART_MCUX_0_IRQ_STATUS_PRI,
	uart_mcux_isr, DEVICE_GET(uart_0), 0);

	irq_enable(DT_UART_MCUX_0_IRQ_STATUS);

	IRQ_CONNECT(DT_UART_MCUX_0_IRQ_ERROR,
	DT_UART_MCUX_0_IRQ_ERROR_PRI,
	uart_mcux_isr, DEVICE_GET(uart_0), 0);

	irq_enable(DT_UART_MCUX_0_IRQ_ERROR);
	}
	#endif

	#endif /* CONFIG_UART_MCUX_0 */

	#ifdef CONFIG_UART_MCUX_1

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_1(struct device *dev);
	#endif

	static const struct uart_mcux_config uart_mcux_1_config = {
	.base = UART1,
	.clock_name = DT_UART_MCUX_1_CLOCK_NAME,
	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_1_CLOCK_SUBSYS,
	.baud_rate = DT_UART_MCUX_1_BAUD_RATE,
	.hw_flow_control = DT_UART_MCUX_1_HW_FLOW_CONTROL,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_mcux_config_func_1,
	#endif
	};

	static struct uart_mcux_data uart_mcux_1_data;

	DEVICE_AND_API_INIT(uart_1, DT_UART_MCUX_1_NAME,
	&uart_mcux_init,
	&uart_mcux_1_data, &uart_mcux_1_config,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_mcux_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_1(struct device *dev)
	{
	IRQ_CONNECT(DT_UART_MCUX_1_IRQ_STATUS,
	DT_UART_MCUX_1_IRQ_STATUS_PRI,
	uart_mcux_isr, DEVICE_GET(uart_1), 0);

	irq_enable(DT_UART_MCUX_1_IRQ_STATUS);

	IRQ_CONNECT(DT_UART_MCUX_1_IRQ_ERROR,
	DT_UART_MCUX_1_IRQ_ERROR_PRI,
	uart_mcux_isr, DEVICE_GET(uart_1), 0);

	irq_enable(DT_UART_MCUX_1_IRQ_ERROR);
	}
	#endif

	#endif /* CONFIG_UART_MCUX_1 */

	#ifdef CONFIG_UART_MCUX_2

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_2(struct device *dev);
	#endif

	static const struct uart_mcux_config uart_mcux_2_config = {
	.base = UART2,
	.clock_name = DT_UART_MCUX_2_CLOCK_NAME,
	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_2_CLOCK_SUBSYS,
	.baud_rate = DT_UART_MCUX_2_BAUD_RATE,
	.hw_flow_control = DT_UART_MCUX_2_HW_FLOW_CONTROL,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_mcux_config_func_2,
	#endif
	};

	static struct uart_mcux_data uart_mcux_2_data;

	DEVICE_AND_API_INIT(uart_2, DT_UART_MCUX_2_NAME,
	&uart_mcux_init,
	&uart_mcux_2_data, &uart_mcux_2_config,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_mcux_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_2(struct device *dev)
	{
	IRQ_CONNECT(DT_UART_MCUX_2_IRQ_STATUS,
	DT_UART_MCUX_2_IRQ_STATUS_PRI,
	uart_mcux_isr, DEVICE_GET(uart_2), 0);

	irq_enable(DT_UART_MCUX_2_IRQ_STATUS);

	IRQ_CONNECT(DT_UART_MCUX_2_IRQ_ERROR,
	DT_UART_MCUX_2_IRQ_ERROR_PRI,
	uart_mcux_isr, DEVICE_GET(uart_2), 0);

	irq_enable(DT_UART_MCUX_2_IRQ_ERROR);
	}
	#endif

	#endif /* CONFIG_UART_MCUX_2 */

	#ifdef CONFIG_UART_MCUX_3

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_3(struct device *dev);
	#endif

	static const struct uart_mcux_config uart_mcux_3_config = {
	.base = UART3,
	.clock_name = DT_UART_MCUX_3_CLOCK_NAME,
	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_3_CLOCK_SUBSYS,
	.baud_rate = DT_UART_MCUX_3_BAUD_RATE,
	.hw_flow_control = DT_UART_MCUX_3_HW_FLOW_CONTROL,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_mcux_config_func_3,
	#endif
	};

	static struct uart_mcux_data uart_mcux_3_data;

	DEVICE_AND_API_INIT(uart_3, DT_UART_MCUX_3_NAME,
	&uart_mcux_init,
	&uart_mcux_3_data, &uart_mcux_3_config,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_mcux_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_3(struct device *dev)
	{
	IRQ_CONNECT(DT_UART_MCUX_3_IRQ_STATUS,
	DT_UART_MCUX_3_IRQ_STATUS_PRI,
	uart_mcux_isr, DEVICE_GET(uart_3), 0);

	irq_enable(DT_UART_MCUX_3_IRQ_STATUS);

	IRQ_CONNECT(DT_UART_MCUX_3_IRQ_ERROR,
	DT_UART_MCUX_3_IRQ_ERROR_PRI,
	uart_mcux_isr, DEVICE_GET(uart_3), 0);

	irq_enable(DT_UART_MCUX_3_IRQ_ERROR);
	}
	#endif

	#endif /* CONFIG_UART_MCUX_3 */

	#ifdef CONFIG_UART_MCUX_4

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_4(struct device *dev);
	#endif

	static const struct uart_mcux_config uart_mcux_4_config = {
	.base = UART4,
	.clock_name = DT_UART_MCUX_4_CLOCK_NAME,
	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_4_CLOCK_SUBSYS,
	.baud_rate = DT_UART_MCUX_4_BAUD_RATE,
	.hw_flow_control = DT_UART_MCUX_4_HW_FLOW_CONTROL,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_mcux_config_func_4,
	#endif
	};

	static struct uart_mcux_data uart_mcux_4_data;

	DEVICE_AND_API_INIT(uart_4, DT_UART_MCUX_4_NAME,
	&uart_mcux_init,
	&uart_mcux_4_data, &uart_mcux_4_config,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_mcux_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_4(struct device *dev)
	{
	IRQ_CONNECT(DT_UART_MCUX_4_IRQ_STATUS,
	DT_UART_MCUX_4_IRQ_STATUS_PRI,
	uart_mcux_isr, DEVICE_GET(uart_4), 0);

	irq_enable(DT_UART_MCUX_4_IRQ_STATUS);

	IRQ_CONNECT(DT_UART_MCUX_4_IRQ_ERROR,
	DT_UART_MCUX_4_IRQ_ERROR_PRI,
	uart_mcux_isr, DEVICE_GET(uart_4), 0);

	irq_enable(DT_UART_MCUX_4_IRQ_ERROR);
	}
	#endif

	#endif /* CONFIG_UART_MCUX_4 */

	#ifdef CONFIG_UART_MCUX_5

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_5(struct device *dev);
	#endif

	static const struct uart_mcux_config uart_mcux_5_config = {
	.base = UART5,
	.clock_name = DT_UART_MCUX_5_CLOCK_NAME,
	.clock_subsys = (clock_control_subsys_t)DT_UART_MCUX_5_CLOCK_SUBSYS,
	.baud_rate = DT_UART_MCUX_5_BAUD_RATE,
	.hw_flow_control = DT_UART_MCUX_5_HW_FLOW_CONTROL,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.irq_config_func = uart_mcux_config_func_5,
	#endif
	};

	static struct uart_mcux_data uart_mcux_5_data;

	DEVICE_AND_API_INIT(uart_5, DT_UART_MCUX_5_NAME,
	&uart_mcux_init,
	&uart_mcux_5_data, &uart_mcux_5_config,
	PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
	&uart_mcux_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_mcux_config_func_5(struct device *dev)
	{
	IRQ_CONNECT(DT_UART_MCUX_5_IRQ_STATUS,
	DT_UART_MCUX_5_IRQ_STATUS_PRI,
	uart_mcux_isr, DEVICE_GET(uart_5), 0);

	irq_enable(DT_UART_MCUX_5_IRQ_STATUS);

	IRQ_CONNECT(DT_UART_MCUX_5_IRQ_ERROR,
	DT_UART_MCUX_5_IRQ_ERROR_PRI,
	uart_mcux_isr, DEVICE_GET(uart_5), 0);

	irq_enable(DT_UART_MCUX_5_IRQ_ERROR);
	}
	#endif

	#endif /* CONFIG_UART_MCUX_5 */