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

 /*
  * Copyright (c) 2018 Antmicro <www.antmicro.com>
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT microchip_coreuart

 #include <zephyr/kernel.h>
 #include <zephyr/arch/cpu.h>
 #include <zephyr/drivers/uart.h>


 /* UART REGISTERS DEFINITIONS */

 /* TX register */
 #define TXDATA_REG_OFFSET   0x0

 #define TXDATA_OFFSET   0x0
 #define TXDATA_MASK     0xFF
 #define TXDATA_SHIFT    0

 /* RX register */
 #define RXDATA_REG_OFFSET   0x4

 #define RXDATA_OFFSET   0x4
 #define RXDATA_MASK     0xFF
 #define RXDATA_SHIFT    0

 /* Control1 register */
 #define CTRL1_REG_OFFSET        0x8

 /* Baud value lower 8 bits */
 #define CTRL1_BAUDVALUE_OFFSET   0x8
 #define CTRL1_BAUDVALUE_MASK     0xFF
 #define CTRL1_BAUDVALUE_SHIFT    0

 /* Control2 register */
 #define CTRL2_REG_OFFSET          0xC

 /* Bit length */
 #define CTRL2_BIT_LENGTH_OFFSET   0xC
 #define CTRL2_BIT_LENGTH_MASK     0x01
 #define CTRL2_BIT_LENGTH_SHIFT    0

 /* Parity enable */
 #define CTRL2_PARITY_EN_OFFSET    0xC
 #define CTRL2_PARITY_EN_MASK      0x02
 #define CTRL2_PARITY_EN_SHIFT     1

 /* Odd/even parity configuration */
 #define CTRL2_ODD_EVEN_OFFSET     0xC
 #define CTRL2_ODD_EVEN_MASK       0x04
 #define CTRL2_ODD_EVEN_SHIFT      2

 /* Baud value higher 5 bits */
 #define CTRL2_BAUDVALUE_OFFSET    0xC
 #define CTRL2_BAUDVALUE_MASK      0xF8
 #define CTRL2_BAUDVALUE_SHIFT     3

 /* Status register */
 #define StatusReg_REG_OFFSET    0x10

 #define STATUS_REG_OFFSET       0x10

 /* TX ready */
 #define STATUS_TXRDY_OFFSET   0x10
 #define STATUS_TXRDY_MASK     0x01
 #define STATUS_TXRDY_SHIFT    0

 /* Receive full - raised even when 1 char arrived */
 #define STATUS_RXFULL_OFFSET   0x10
 #define STATUS_RXFULL_MASK     0x02
 #define STATUS_RXFULL_SHIFT    1

 /* Parity error */
 #define STATUS_PARITYERR_OFFSET   0x10
 #define STATUS_PARITYERR_MASK     0x04
 #define STATUS_PARITYERR_SHIFT    2

 /* Overflow */
 #define STATUS_OVERFLOW_OFFSET   0x10
 #define STATUS_OVERFLOW_MASK     0x08
 #define STATUS_OVERFLOW_SHIFT    3

 /* Frame error */
 #define STATUS_FRAMERR_OFFSET   0x10
 #define STATUS_FRAMERR_MASK     0x10
 #define STATUS_FRAMERR_SHIFT    4

 /* Data bits length defines */
 #define DATA_7_BITS     0x00
 #define DATA_8_BITS     0x01

 /* Parity defines */
 #define NO_PARITY       0x00
 #define EVEN_PARITY     0x02
 #define ODD_PARITY      0x06

 /* Error Status definitions */
 #define UART_PARITY_ERROR    0x01
 #define UART_OVERFLOW_ERROR  0x02
 #define UART_FRAMING_ERROR   0x04

 #define BAUDVALUE_LSB ((uint16_t)(0x00FF))
 #define BAUDVALUE_MSB ((uint16_t)(0xFF00))
 #define BAUDVALUE_SHIFT ((uint8_t)(5))

 #define MIV_UART_0_LINECFG 0x1

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static struct k_thread rx_thread;
 static K_KERNEL_STACK_DEFINE(rx_stack, 512);
 #endif

 struct uart_miv_regs_t {
 	uint8_t tx;
 	uint8_t reserved0[3];
 	uint8_t rx;
 	uint8_t reserved1[3];
 	uint8_t ctrlreg1;
 	uint8_t reserved2[3];
 	uint8_t ctrlreg2;
 	uint8_t reserved3[3];
 	uint8_t status;
 };

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 typedef void (*irq_cfg_func_t)(const struct device *dev);
 #endif

 struct uart_miv_device_config {
 	uint32_t       uart_addr;
 	uint32_t       sys_clk_freq;
 	uint32_t       line_config;
 	uint32_t       baud_rate;
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	irq_cfg_func_t cfg_func;
 #endif
 };

 struct uart_miv_data {
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	const struct device *dev;
 	uart_irq_callback_user_data_t callback;
 	void *cb_data;
 #endif
 };

 #define DEV_UART(dev)						\
 	((struct uart_miv_regs_t *)				\
 	 ((const struct uart_miv_device_config * const)(dev)->config)->uart_addr)

 static void uart_miv_poll_out(const struct device *dev,
 				       unsigned char c)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

 	while (!(uart->status & STATUS_TXRDY_MASK)) {
 	}

 	uart->tx = c;
 }

 static int uart_miv_poll_in(const struct device *dev, unsigned char *c)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

 	if (uart->status & STATUS_RXFULL_MASK) {
 		*c = (unsigned char)(uart->rx & RXDATA_MASK);
 		return 0;
 	}

 	return -1;
 }

 static int uart_miv_err_check(const struct device *dev)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
 	uint32_t flags = uart->status;
 	int err = 0;

 	if (flags & STATUS_PARITYERR_MASK) {
 		err |= UART_PARITY_ERROR;
 	}

 	if (flags & STATUS_OVERFLOW_MASK) {
 		err |= UART_OVERFLOW_ERROR;
 	}

 	if (flags & STATUS_FRAMERR_MASK) {
 		err |= UART_FRAMING_ERROR;
 	}

 	return err;
 }


 #ifdef CONFIG_UART_INTERRUPT_DRIVEN

 static int uart_miv_fifo_fill(const struct device *dev,
 			      const uint8_t *tx_data,
 			      int size)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
 	int i;

 	for (i = 0; i < size && (uart->status & STATUS_TXRDY_MASK); i++) {
 		uart->tx = tx_data[i];
 	}

 	return i;
 }

 static int uart_miv_fifo_read(const struct device *dev,
 			      uint8_t *rx_data,
 			      const int size)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
 	int i;

 	for (i = 0; i < size; i++) {
 		if (uart->status & STATUS_RXFULL_MASK) {
 			rx_data[i] = (unsigned char)(uart->rx & RXDATA_MASK);
 		} else {
 			break;
 		}
 	}

 	return i;
 }

 static void uart_miv_irq_tx_enable(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 }

 static void uart_miv_irq_tx_disable(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 }

 static int uart_miv_irq_tx_ready(const struct device *dev)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

 	return !(uart->status & STATUS_TXRDY_MASK);
 }

 static int uart_miv_irq_tx_complete(const struct device *dev)
 {
 	ARG_UNUSED(dev);

 	return 1;
 }

 static void uart_miv_irq_rx_enable(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 }

 static void uart_miv_irq_rx_disable(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 }

 static int uart_miv_irq_rx_ready(const struct device *dev)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

 	return !!(uart->status & STATUS_RXFULL_MASK);
 }

 static void uart_miv_irq_err_enable(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 }

 static void uart_miv_irq_err_disable(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 }

 static int uart_miv_irq_is_pending(const struct device *dev)
 {
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

 	return !!(uart->status & STATUS_RXFULL_MASK);
 }

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

 static void uart_miv_irq_handler(const struct device *dev)
 {
 	struct uart_miv_data *data = dev->data;

 	if (data->callback) {
 		data->callback(dev, data->cb_data);
 	}
 }

 /*
  * This thread is a workaround for IRQs that are not connected in Mi-V.
  * Since we cannot rely on IRQs, the rx_thread is working instead and
  * polling for data. The thread calls the registered callback when data
  * arrives.
  */
 void uart_miv_rx_thread(void *arg1, void *arg2, void *arg3)
 {
 	struct uart_miv_data *data = (struct uart_miv_data *)arg1;
 	const struct device *dev = data->dev;
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
 	const struct uart_miv_device_config *const cfg = dev->config;
 	/* Make it go to sleep for a period no longer than
 	 * time to receive next character.
 	 */
 	uint32_t delay = 1000000 / cfg->baud_rate;

 	ARG_UNUSED(arg2);
 	ARG_UNUSED(arg3);

 	while (1) {
 		if (uart->status & STATUS_RXFULL_MASK) {
 			uart_miv_irq_handler(dev);
 		}
 		k_sleep(K_USEC(delay));
 	}
 }

 static void uart_miv_irq_callback_set(const struct device *dev,
 				      uart_irq_callback_user_data_t cb,
 				      void *cb_data)
 {
 	struct uart_miv_data *data = dev->data;

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

 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 static int uart_miv_init(const struct device *dev)
 {
 	const struct uart_miv_device_config *const cfg = dev->config;
 	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
 	/* Calculate divider value to set baudrate */
 	uint16_t baud_value = (cfg->sys_clk_freq / (cfg->baud_rate * 16U)) - 1;

 	/* Set baud rate */
 	uart->ctrlreg1 = (uint8_t)(baud_value & BAUDVALUE_LSB);
 	uart->ctrlreg2 = (uint8_t)(cfg->line_config) |
 			 (uint8_t)((baud_value & BAUDVALUE_MSB) >> BAUDVALUE_SHIFT);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	/* Setup thread polling for data */
 	cfg->cfg_func(dev);
 #endif
 	return 0;
 }

 static const struct uart_driver_api uart_miv_driver_api = {
 	.poll_in          = uart_miv_poll_in,
 	.poll_out         = uart_miv_poll_out,
 	.err_check        = uart_miv_err_check,
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.fifo_fill        = uart_miv_fifo_fill,
 	.fifo_read        = uart_miv_fifo_read,
 	.irq_tx_enable    = uart_miv_irq_tx_enable,
 	.irq_tx_disable   = uart_miv_irq_tx_disable,
 	.irq_tx_ready     = uart_miv_irq_tx_ready,
 	.irq_tx_complete  = uart_miv_irq_tx_complete,
 	.irq_rx_enable    = uart_miv_irq_rx_enable,
 	.irq_rx_disable   = uart_miv_irq_rx_disable,
 	.irq_rx_ready     = uart_miv_irq_rx_ready,
 	.irq_err_enable   = uart_miv_irq_err_enable,
 	.irq_err_disable  = uart_miv_irq_err_disable,
 	.irq_is_pending   = uart_miv_irq_is_pending,
 	.irq_update       = uart_miv_irq_update,
 	.irq_callback_set = uart_miv_irq_callback_set,
 #endif
 };

 /* This driver is single-instance. */
 BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) <= 1,
 	     "unsupported uart_miv instance");

 #if DT_NODE_HAS_STATUS_OKAY(DT_DRV_INST(0))

 static struct uart_miv_data uart_miv_data_0;

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_miv_irq_cfg_func_0(const struct device *dev);
 #endif

 static const struct uart_miv_device_config uart_miv_dev_cfg_0 = {
 	.uart_addr    = DT_INST_REG_ADDR(0),
 	.sys_clk_freq = DT_INST_PROP(0, clock_frequency),
 	.line_config  = MIV_UART_0_LINECFG,
 	.baud_rate    = DT_INST_PROP(0, current_speed),
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.cfg_func     = uart_miv_irq_cfg_func_0,
 #endif
 };

 DEVICE_DT_INST_DEFINE(0, uart_miv_init, NULL,
 		    &uart_miv_data_0, &uart_miv_dev_cfg_0,
 		    PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,
 		    (void *)&uart_miv_driver_api);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static void uart_miv_irq_cfg_func_0(const struct device *dev)
 {
 	struct uart_miv_data *data = dev->data;

 	data->dev = dev;

 	/* Create a thread which will poll for data - replacement for IRQ */
 	k_thread_create(&rx_thread, rx_stack, 500,
 			uart_miv_rx_thread, data, NULL, NULL, K_PRIO_COOP(2),
 			0, K_NO_WAIT);
 }
 #endif

 #endif /* DT_NODE_HAS_STATUS_OKAY(DT_DRV_INST(0)) */
	/*
	* Copyright (c) 2018 Antmicro <www.antmicro.com>
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT microchip_coreuart

	#include <zephyr/kernel.h>
	#include <zephyr/arch/cpu.h>
	#include <zephyr/drivers/uart.h>


	/* UART REGISTERS DEFINITIONS */

	/* TX register */
	#define TXDATA_REG_OFFSET 0x0

	#define TXDATA_OFFSET 0x0
	#define TXDATA_MASK 0xFF
	#define TXDATA_SHIFT 0

	/* RX register */
	#define RXDATA_REG_OFFSET 0x4

	#define RXDATA_OFFSET 0x4
	#define RXDATA_MASK 0xFF
	#define RXDATA_SHIFT 0

	/* Control1 register */
	#define CTRL1_REG_OFFSET 0x8

	/* Baud value lower 8 bits */
	#define CTRL1_BAUDVALUE_OFFSET 0x8
	#define CTRL1_BAUDVALUE_MASK 0xFF
	#define CTRL1_BAUDVALUE_SHIFT 0

	/* Control2 register */
	#define CTRL2_REG_OFFSET 0xC

	/* Bit length */
	#define CTRL2_BIT_LENGTH_OFFSET 0xC
	#define CTRL2_BIT_LENGTH_MASK 0x01
	#define CTRL2_BIT_LENGTH_SHIFT 0

	/* Parity enable */
	#define CTRL2_PARITY_EN_OFFSET 0xC
	#define CTRL2_PARITY_EN_MASK 0x02
	#define CTRL2_PARITY_EN_SHIFT 1

	/* Odd/even parity configuration */
	#define CTRL2_ODD_EVEN_OFFSET 0xC
	#define CTRL2_ODD_EVEN_MASK 0x04
	#define CTRL2_ODD_EVEN_SHIFT 2

	/* Baud value higher 5 bits */
	#define CTRL2_BAUDVALUE_OFFSET 0xC
	#define CTRL2_BAUDVALUE_MASK 0xF8
	#define CTRL2_BAUDVALUE_SHIFT 3

	/* Status register */
	#define StatusReg_REG_OFFSET 0x10

	#define STATUS_REG_OFFSET 0x10

	/* TX ready */
	#define STATUS_TXRDY_OFFSET 0x10
	#define STATUS_TXRDY_MASK 0x01
	#define STATUS_TXRDY_SHIFT 0

	/* Receive full - raised even when 1 char arrived */
	#define STATUS_RXFULL_OFFSET 0x10
	#define STATUS_RXFULL_MASK 0x02
	#define STATUS_RXFULL_SHIFT 1

	/* Parity error */
	#define STATUS_PARITYERR_OFFSET 0x10
	#define STATUS_PARITYERR_MASK 0x04
	#define STATUS_PARITYERR_SHIFT 2

	/* Overflow */
	#define STATUS_OVERFLOW_OFFSET 0x10
	#define STATUS_OVERFLOW_MASK 0x08
	#define STATUS_OVERFLOW_SHIFT 3

	/* Frame error */
	#define STATUS_FRAMERR_OFFSET 0x10
	#define STATUS_FRAMERR_MASK 0x10
	#define STATUS_FRAMERR_SHIFT 4

	/* Data bits length defines */
	#define DATA_7_BITS 0x00
	#define DATA_8_BITS 0x01

	/* Parity defines */
	#define NO_PARITY 0x00
	#define EVEN_PARITY 0x02
	#define ODD_PARITY 0x06

	/* Error Status definitions */
	#define UART_PARITY_ERROR 0x01
	#define UART_OVERFLOW_ERROR 0x02
	#define UART_FRAMING_ERROR 0x04

	#define BAUDVALUE_LSB ((uint16_t)(0x00FF))
	#define BAUDVALUE_MSB ((uint16_t)(0xFF00))
	#define BAUDVALUE_SHIFT ((uint8_t)(5))

	#define MIV_UART_0_LINECFG 0x1

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static struct k_thread rx_thread;
	static K_KERNEL_STACK_DEFINE(rx_stack, 512);
	#endif

	struct uart_miv_regs_t {
	uint8_t tx;
	uint8_t reserved0[3];
	uint8_t rx;
	uint8_t reserved1[3];
	uint8_t ctrlreg1;
	uint8_t reserved2[3];
	uint8_t ctrlreg2;
	uint8_t reserved3[3];
	uint8_t status;
	};

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	typedef void (irq_cfg_func_t)(const struct device dev);
	#endif

	struct uart_miv_device_config {
	uint32_t uart_addr;
	uint32_t sys_clk_freq;
	uint32_t line_config;
	uint32_t baud_rate;
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	irq_cfg_func_t cfg_func;
	#endif
	};

	struct uart_miv_data {
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	const struct device *dev;
	uart_irq_callback_user_data_t callback;
	void *cb_data;
	#endif
	};

	#define DEV_UART(dev) \
	((struct uart_miv_regs_t *) \
	((const struct uart_miv_device_config * const)(dev)->config)->uart_addr)

	static void uart_miv_poll_out(const struct device *dev,
	unsigned char c)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

	while (!(uart->status & STATUS_TXRDY_MASK)) {
	}

	uart->tx = c;
	}

	static int uart_miv_poll_in(const struct device dev, unsigned char c)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

	if (uart->status & STATUS_RXFULL_MASK) {
	*c = (unsigned char)(uart->rx & RXDATA_MASK);
	return 0;
	}

	return -1;
	}

	static int uart_miv_err_check(const struct device *dev)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
	uint32_t flags = uart->status;
	int err = 0;

	if (flags & STATUS_PARITYERR_MASK) {
	err \|= UART_PARITY_ERROR;
	}

	if (flags & STATUS_OVERFLOW_MASK) {
	err \|= UART_OVERFLOW_ERROR;
	}

	if (flags & STATUS_FRAMERR_MASK) {
	err \|= UART_FRAMING_ERROR;
	}

	return err;
	}


	#ifdef CONFIG_UART_INTERRUPT_DRIVEN

	static int uart_miv_fifo_fill(const struct device *dev,
	const uint8_t *tx_data,
	int size)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
	int i;

	for (i = 0; i < size && (uart->status & STATUS_TXRDY_MASK); i++) {
	uart->tx = tx_data[i];
	}

	return i;
	}

	static int uart_miv_fifo_read(const struct device *dev,
	uint8_t *rx_data,
	const int size)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
	int i;

	for (i = 0; i < size; i++) {
	if (uart->status & STATUS_RXFULL_MASK) {
	rx_data[i] = (unsigned char)(uart->rx & RXDATA_MASK);
	} else {
	break;
	}
	}

	return i;
	}

	static void uart_miv_irq_tx_enable(const struct device *dev)
	{
	ARG_UNUSED(dev);
	}

	static void uart_miv_irq_tx_disable(const struct device *dev)
	{
	ARG_UNUSED(dev);
	}

	static int uart_miv_irq_tx_ready(const struct device *dev)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

	return !(uart->status & STATUS_TXRDY_MASK);
	}

	static int uart_miv_irq_tx_complete(const struct device *dev)
	{
	ARG_UNUSED(dev);

	return 1;
	}

	static void uart_miv_irq_rx_enable(const struct device *dev)
	{
	ARG_UNUSED(dev);
	}

	static void uart_miv_irq_rx_disable(const struct device *dev)
	{
	ARG_UNUSED(dev);
	}

	static int uart_miv_irq_rx_ready(const struct device *dev)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

	return !!(uart->status & STATUS_RXFULL_MASK);
	}

	static void uart_miv_irq_err_enable(const struct device *dev)
	{
	ARG_UNUSED(dev);
	}

	static void uart_miv_irq_err_disable(const struct device *dev)
	{
	ARG_UNUSED(dev);
	}

	static int uart_miv_irq_is_pending(const struct device *dev)
	{
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);

	return !!(uart->status & STATUS_RXFULL_MASK);
	}

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

	static void uart_miv_irq_handler(const struct device *dev)
	{
	struct uart_miv_data *data = dev->data;

	if (data->callback) {
	data->callback(dev, data->cb_data);
	}
	}

	/*
	* This thread is a workaround for IRQs that are not connected in Mi-V.
	* Since we cannot rely on IRQs, the rx_thread is working instead and
	* polling for data. The thread calls the registered callback when data
	* arrives.
	*/
	void uart_miv_rx_thread(void arg1, void arg2, void *arg3)
	{
	struct uart_miv_data data = (struct uart_miv_data )arg1;
	const struct device *dev = data->dev;
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
	const struct uart_miv_device_config *const cfg = dev->config;
	/* Make it go to sleep for a period no longer than
	* time to receive next character.
	*/
	uint32_t delay = 1000000 / cfg->baud_rate;

	ARG_UNUSED(arg2);
	ARG_UNUSED(arg3);

	while (1) {
	if (uart->status & STATUS_RXFULL_MASK) {
	uart_miv_irq_handler(dev);
	}
	k_sleep(K_USEC(delay));
	}
	}

	static void uart_miv_irq_callback_set(const struct device *dev,
	uart_irq_callback_user_data_t cb,
	void *cb_data)
	{
	struct uart_miv_data *data = dev->data;

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

	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static int uart_miv_init(const struct device *dev)
	{
	const struct uart_miv_device_config *const cfg = dev->config;
	volatile struct uart_miv_regs_t *uart = DEV_UART(dev);
	/* Calculate divider value to set baudrate */
	uint16_t baud_value = (cfg->sys_clk_freq / (cfg->baud_rate * 16U)) - 1;

	/* Set baud rate */
	uart->ctrlreg1 = (uint8_t)(baud_value & BAUDVALUE_LSB);
	uart->ctrlreg2 = (uint8_t)(cfg->line_config) \|
	(uint8_t)((baud_value & BAUDVALUE_MSB) >> BAUDVALUE_SHIFT);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	/* Setup thread polling for data */
	cfg->cfg_func(dev);
	#endif
	return 0;
	}

	static const struct uart_driver_api uart_miv_driver_api = {
	.poll_in = uart_miv_poll_in,
	.poll_out = uart_miv_poll_out,
	.err_check = uart_miv_err_check,
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.fifo_fill = uart_miv_fifo_fill,
	.fifo_read = uart_miv_fifo_read,
	.irq_tx_enable = uart_miv_irq_tx_enable,
	.irq_tx_disable = uart_miv_irq_tx_disable,
	.irq_tx_ready = uart_miv_irq_tx_ready,
	.irq_tx_complete = uart_miv_irq_tx_complete,
	.irq_rx_enable = uart_miv_irq_rx_enable,
	.irq_rx_disable = uart_miv_irq_rx_disable,
	.irq_rx_ready = uart_miv_irq_rx_ready,
	.irq_err_enable = uart_miv_irq_err_enable,
	.irq_err_disable = uart_miv_irq_err_disable,
	.irq_is_pending = uart_miv_irq_is_pending,
	.irq_update = uart_miv_irq_update,
	.irq_callback_set = uart_miv_irq_callback_set,
	#endif
	};

	/* This driver is single-instance. */
	BUILD_ASSERT(DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) <= 1,
	"unsupported uart_miv instance");

	#if DT_NODE_HAS_STATUS_OKAY(DT_DRV_INST(0))

	static struct uart_miv_data uart_miv_data_0;

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_miv_irq_cfg_func_0(const struct device *dev);
	#endif

	static const struct uart_miv_device_config uart_miv_dev_cfg_0 = {
	.uart_addr = DT_INST_REG_ADDR(0),
	.sys_clk_freq = DT_INST_PROP(0, clock_frequency),
	.line_config = MIV_UART_0_LINECFG,
	.baud_rate = DT_INST_PROP(0, current_speed),
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.cfg_func = uart_miv_irq_cfg_func_0,
	#endif
	};

	DEVICE_DT_INST_DEFINE(0, uart_miv_init, NULL,
	&uart_miv_data_0, &uart_miv_dev_cfg_0,
	PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,
	(void *)&uart_miv_driver_api);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static void uart_miv_irq_cfg_func_0(const struct device *dev)
	{
	struct uart_miv_data *data = dev->data;

	data->dev = dev;

	/* Create a thread which will poll for data - replacement for IRQ */
	k_thread_create(&rx_thread, rx_stack, 500,
	uart_miv_rx_thread, data, NULL, NULL, K_PRIO_COOP(2),
	0, K_NO_WAIT);
	}
	#endif

	#endif /* DT_NODE_HAS_STATUS_OKAY(DT_DRV_INST(0)) */