drivers/serial/uart_ene_kb1200.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2023 ENE Technology Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT ene_kb1200_uart

 #include <zephyr/kernel.h>
 #include <zephyr/drivers/uart.h>
 #include <zephyr/drivers/pinctrl.h>
 #include <reg/ser.h>

 struct kb1200_uart_config {
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	void (*irq_cfg_func)(void);
 #endif
 	struct serial_regs *ser;
 	const struct pinctrl_dev_config *pcfg;
 };

 struct kb1200_uart_data {
 	uart_irq_callback_user_data_t callback;
 	struct uart_config current_config;
 	void *callback_data;
 	uint8_t pending_flag_data;
 };

 static int kb1200_uart_err_check(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;
 	int err = 0;

 	if (config->ser->SERSTS & SERSTS_RX_OVERRUN) {
 		err |= UART_ERROR_OVERRUN;
 	}
 	if (config->ser->SERSTS & SERSTS_PARITY_ERROR) {
 		err |= UART_ERROR_PARITY;
 	}
 	if (config->ser->SERSTS & SERSTS_FRAME_ERROR) {
 		err |= UART_ERROR_FRAMING;
 	}
 	return err;
 }

 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 static int kb1200_uart_configure(const struct device *dev, const struct uart_config *cfg)
 {
 	uint16_t reg_baudrate = 0;
 	uint8_t reg_parity = 0;
 	int ret = 0;
 	const struct kb1200_uart_config *config = dev->config;
 	struct kb1200_uart_data *data = dev->data;

 	reg_baudrate = (DIVIDER_BASE_CLK / cfg->baudrate) - 1;

 	switch (cfg->parity) {
 	case UART_CFG_PARITY_NONE:
 		reg_parity = SERCFG_PARITY_NONE;
 		break;
 	case UART_CFG_PARITY_ODD:
 		reg_parity = SERCFG_PARITY_ODD;
 		break;
 	case UART_CFG_PARITY_EVEN:
 		reg_parity = SERCFG_PARITY_EVEN;
 		break;
 	case UART_CFG_PARITY_MARK:
 	case UART_CFG_PARITY_SPACE:
 	default:
 		ret = -ENOTSUP;
 		break;
 	}

 	switch (cfg->stop_bits) {
 	case UART_CFG_STOP_BITS_1:
 		break;
 	case UART_CFG_STOP_BITS_0_5:
 	case UART_CFG_STOP_BITS_1_5:
 	case UART_CFG_STOP_BITS_2:
 	default:
 		ret = -ENOTSUP;
 		break;
 	}

 	switch (cfg->data_bits) {
 	case UART_CFG_DATA_BITS_8:
 		break;
 	case UART_CFG_DATA_BITS_5:
 	case UART_CFG_DATA_BITS_6:
 	case UART_CFG_DATA_BITS_7:
 	case UART_CFG_DATA_BITS_9:
 	default:
 		ret = -ENOTSUP;
 		break;
 	}

 	switch (cfg->flow_ctrl) {
 	case UART_CFG_FLOW_CTRL_NONE:
 		break;
 	case UART_CFG_FLOW_CTRL_RTS_CTS:
 	case UART_CFG_FLOW_CTRL_DTR_DSR:
 	case UART_CFG_FLOW_CTRL_RS485:
 	default:
 		ret = -ENOTSUP;
 		break;
 	}
 	config->ser->SERCFG =
 		(reg_baudrate << 16) | (reg_parity << 2) | (SERIE_RX_ENABLE | SERIE_TX_ENABLE);
 	config->ser->SERCTRL = SERCTRL_MODE1;
 	data->current_config = *cfg;
 	return ret;
 }

 static int kb1200_uart_config_get(const struct device *dev, struct uart_config *cfg)
 {
 	struct kb1200_uart_data *data = dev->data;

 	*cfg = data->current_config;
 	return 0;
 }
 #endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static int kb1200_uart_fifo_fill(const struct device *dev, const uint8_t *tx_data, int size)
 {
 	const struct kb1200_uart_config *config = dev->config;
 	uint16_t tx_bytes = 0U;

 	while ((size - tx_bytes) > 0) {
 		/* Check Tx FIFO not Full*/
 		while (config->ser->SERSTS & SERSTS_TX_FULL)
 			;
 		/* Put a character into	Tx FIFO	*/
 		config->ser->SERTBUF = tx_data[tx_bytes];
 		tx_bytes++;
 	}
 	return tx_bytes;
 }

 static int kb1200_uart_fifo_read(const struct device *dev, uint8_t *rx_data, const int size)
 {
 	const struct kb1200_uart_config *config = dev->config;
 	uint16_t rx_bytes = 0U;

 	/* Check Rx FIFO not Empty*/
 	while ((size - rx_bytes > 0) && (!(config->ser->SERSTS & SERSTS_RX_EMPTY))) {
 		/* Put a character into	Tx FIFO	*/
 		rx_data[rx_bytes] = config->ser->SERRBUF;
 		rx_bytes++;
 	}
 	return rx_bytes;
 }

 static void kb1200_uart_irq_tx_enable(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;

 	config->ser->SERPF = SERPF_TX_EMPTY;
 	config->ser->SERIE |= SERIE_TX_ENABLE;
 }

 static void kb1200_uart_irq_tx_disable(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;

 	config->ser->SERIE &= ~SERIE_TX_ENABLE;
 	config->ser->SERPF = SERPF_TX_EMPTY;
 }

 static int kb1200_uart_irq_tx_ready(const struct device *dev)
 {
 	struct kb1200_uart_data *data = dev->data;

 	return (data->pending_flag_data & SERPF_TX_EMPTY) ? 1 : 0;
 }

 static void kb1200_uart_irq_rx_enable(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;

 	config->ser->SERPF = SERPF_RX_CNT_FULL;
 	config->ser->SERIE |= SERIE_RX_ENABLE;
 }

 static void kb1200_uart_irq_rx_disable(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;

 	config->ser->SERIE &= (~SERIE_RX_ENABLE);
 	config->ser->SERPF = SERPF_RX_CNT_FULL;
 }

 static int kb1200_uart_irq_rx_ready(const struct device *dev)
 {
 	struct kb1200_uart_data *data = dev->data;

 	return (data->pending_flag_data & SERPF_RX_CNT_FULL) ? 1 : 0;
 }

 static void kb1200_uart_irq_err_enable(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;

 	config->ser->SERPF = SERPF_RX_ERROR;
 	config->ser->SERIE |= SERIE_RX_ERROR;
 }

 static void kb1200_uart_irq_err_disable(const struct device *dev)
 {
 	const struct kb1200_uart_config *config = dev->config;

 	config->ser->SERIE &= (~SERIE_RX_ERROR);
 	config->ser->SERPF = SERPF_RX_ERROR;
 }

 static int kb1200_uart_irq_is_pending(const struct device *dev)
 {
 	struct kb1200_uart_data *data = dev->data;

 	return (data->pending_flag_data) ? 1 : 0;
 }

 static int kb1200_uart_irq_update(const struct device *dev)
 {
 	struct kb1200_uart_data *data = dev->data;
 	const struct kb1200_uart_config *config = dev->config;

 	data->pending_flag_data = (config->ser->SERPF) & (config->ser->SERIE);
 	/*clear	pending	flag*/
 	config->ser->SERPF = data->pending_flag_data;
 	return 1;
 }

 static void kb1200_uart_irq_callback_set(const struct device *dev, uart_irq_callback_user_data_t cb,
 					 void *cb_data)
 {
 	struct kb1200_uart_data *data = dev->data;

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

 static void kb1200_uart_irq_handler(const struct device *dev)
 {
 	struct kb1200_uart_data *data = dev->data;

 	if (data->callback) {
 		data->callback(dev, data->callback_data);
 	}
 }
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 static int kb1200_uart_poll_in(const struct device *dev, unsigned char *c)
 {
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	return kb1200_uart_fifo_read(dev, c, 1) ? 0 : -1;
 #else
 	const struct kb1200_uart_config *config = dev->config;

 	/* Check Rx FIFO not Empty*/
 	if (config->ser->SERSTS & SERSTS_RX_EMPTY) {
 		return -1;
 	}
 	/* Put a character into Tx FIFO */
 	*c = config->ser->SERRBUF;
 	return 0;
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */
 }

 static void kb1200_uart_poll_out(const struct device *dev, unsigned char c)
 {
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	kb1200_uart_fifo_fill(dev, &c, 1);
 #else
 	const struct kb1200_uart_config *config = dev->config;

 	/* Wait	Tx FIFO	not Full*/
 	while (config->ser->SERSTS & SER_TxFull) {
 		;
 	}
 	/* Put a character into	Tx FIFO */
 	config->ser->SERTBUF = c;
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */
 }

 static const struct uart_driver_api kb1200_uart_api = {
 	.poll_in = kb1200_uart_poll_in,
 	.poll_out = kb1200_uart_poll_out,
 	.err_check = kb1200_uart_err_check,
 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 	.configure = kb1200_uart_configure,
 	.config_get = kb1200_uart_config_get,
 #endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.fifo_fill = kb1200_uart_fifo_fill,
 	.fifo_read = kb1200_uart_fifo_read,
 	.irq_tx_enable = kb1200_uart_irq_tx_enable,
 	.irq_tx_disable = kb1200_uart_irq_tx_disable,
 	.irq_tx_ready = kb1200_uart_irq_tx_ready,
 	.irq_rx_enable = kb1200_uart_irq_rx_enable,
 	.irq_rx_disable = kb1200_uart_irq_rx_disable,
 	.irq_rx_ready = kb1200_uart_irq_rx_ready,
 	.irq_err_enable = kb1200_uart_irq_err_enable,
 	.irq_err_disable = kb1200_uart_irq_err_disable,
 	.irq_is_pending = kb1200_uart_irq_is_pending,
 	.irq_update = kb1200_uart_irq_update,
 	.irq_callback_set = kb1200_uart_irq_callback_set,
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */
 };

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN

 /* GPIO module instances */
 #define KB1200_UART_DEV(inst) DEVICE_DT_INST_GET(inst),
 static const struct device *const uart_devices[] = {DT_INST_FOREACH_STATUS_OKAY(KB1200_UART_DEV)};
 static void kb1200_uart_isr_wrap(const struct device *dev)
 {
 	for (size_t i = 0; i < ARRAY_SIZE(uart_devices); i++) {
 		const struct device *dev_ = uart_devices[i];
 		const struct kb1200_uart_config *config = dev_->config;

 		if (config->ser->SERIE & config->ser->SERPF) {
 			kb1200_uart_irq_handler(dev_);
 		}
 	}
 }
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 static int kb1200_uart_init(const struct device *dev)
 {
 	int ret;
 	const struct kb1200_uart_config *config = dev->config;
 	struct kb1200_uart_data *data = dev->data;

 	ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
 	if (ret != 0) {
 		return ret;
 	}

 	kb1200_uart_configure(dev, &data->current_config);
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	config->irq_cfg_func();
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 	return 0;
 }

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static bool init_irq = true;
 static void kb1200_uart_irq_init(void)
 {
 	if (init_irq) {
 		init_irq = false;
 		IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), kb1200_uart_isr_wrap, NULL,
 			    0);
 		irq_enable(DT_INST_IRQN(0));
 	}
 }
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 #define KB1200_UART_INIT(n)                                                                        \
 	PINCTRL_DT_INST_DEFINE(n);                                                                 \
 	static struct kb1200_uart_data kb1200_uart_data_##n = {                                    \
 		.current_config = {                                                                \
 				.baudrate = DT_INST_PROP(n, current_speed),                        \
 				.parity = UART_CFG_PARITY_NONE,                                    \
 				.stop_bits = UART_CFG_STOP_BITS_1,                                 \
 				.data_bits = UART_CFG_DATA_BITS_8,                                 \
 				.flow_ctrl = UART_CFG_FLOW_CTRL_NONE,                              \
 			},                                                                         \
 	};                                                                                         \
 	static const struct kb1200_uart_config kb1200_uart_config_##n = {                          \
 		IF_ENABLED(CONFIG_UART_INTERRUPT_DRIVEN, (.irq_cfg_func = kb1200_uart_irq_init,))  \
 		.ser = (struct serial_regs *)DT_INST_REG_ADDR(n),                                  \
 		.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n)};                                        \
 	DEVICE_DT_INST_DEFINE(n, &kb1200_uart_init, NULL, &kb1200_uart_data_##n,                   \
 			      &kb1200_uart_config_##n, PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,  \
 			      &kb1200_uart_api);

 DT_INST_FOREACH_STATUS_OKAY(KB1200_UART_INIT)
	/*
	* Copyright (c) 2023 ENE Technology Inc.
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT ene_kb1200_uart

	#include <zephyr/kernel.h>
	#include <zephyr/drivers/uart.h>
	#include <zephyr/drivers/pinctrl.h>
	#include <reg/ser.h>

	struct kb1200_uart_config {
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	void (*irq_cfg_func)(void);
	#endif
	struct serial_regs *ser;
	const struct pinctrl_dev_config *pcfg;
	};

	struct kb1200_uart_data {
	uart_irq_callback_user_data_t callback;
	struct uart_config current_config;
	void *callback_data;
	uint8_t pending_flag_data;
	};

	static int kb1200_uart_err_check(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;
	int err = 0;

	if (config->ser->SERSTS & SERSTS_RX_OVERRUN) {
	err \|= UART_ERROR_OVERRUN;
	}
	if (config->ser->SERSTS & SERSTS_PARITY_ERROR) {
	err \|= UART_ERROR_PARITY;
	}
	if (config->ser->SERSTS & SERSTS_FRAME_ERROR) {
	err \|= UART_ERROR_FRAMING;
	}
	return err;
	}

	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	static int kb1200_uart_configure(const struct device dev, const struct uart_config cfg)
	{
	uint16_t reg_baudrate = 0;
	uint8_t reg_parity = 0;
	int ret = 0;
	const struct kb1200_uart_config *config = dev->config;
	struct kb1200_uart_data *data = dev->data;

	reg_baudrate = (DIVIDER_BASE_CLK / cfg->baudrate) - 1;

	switch (cfg->parity) {
	case UART_CFG_PARITY_NONE:
	reg_parity = SERCFG_PARITY_NONE;
	break;
	case UART_CFG_PARITY_ODD:
	reg_parity = SERCFG_PARITY_ODD;
	break;
	case UART_CFG_PARITY_EVEN:
	reg_parity = SERCFG_PARITY_EVEN;
	break;
	case UART_CFG_PARITY_MARK:
	case UART_CFG_PARITY_SPACE:
	default:
	ret = -ENOTSUP;
	break;
	}

	switch (cfg->stop_bits) {
	case UART_CFG_STOP_BITS_1:
	break;
	case UART_CFG_STOP_BITS_0_5:
	case UART_CFG_STOP_BITS_1_5:
	case UART_CFG_STOP_BITS_2:
	default:
	ret = -ENOTSUP;
	break;
	}

	switch (cfg->data_bits) {
	case UART_CFG_DATA_BITS_8:
	break;
	case UART_CFG_DATA_BITS_5:
	case UART_CFG_DATA_BITS_6:
	case UART_CFG_DATA_BITS_7:
	case UART_CFG_DATA_BITS_9:
	default:
	ret = -ENOTSUP;
	break;
	}

	switch (cfg->flow_ctrl) {
	case UART_CFG_FLOW_CTRL_NONE:
	break;
	case UART_CFG_FLOW_CTRL_RTS_CTS:
	case UART_CFG_FLOW_CTRL_DTR_DSR:
	case UART_CFG_FLOW_CTRL_RS485:
	default:
	ret = -ENOTSUP;
	break;
	}
	config->ser->SERCFG =
	(reg_baudrate << 16) \| (reg_parity << 2) \| (SERIE_RX_ENABLE \| SERIE_TX_ENABLE);
	config->ser->SERCTRL = SERCTRL_MODE1;
	data->current_config = *cfg;
	return ret;
	}

	static int kb1200_uart_config_get(const struct device dev, struct uart_config cfg)
	{
	struct kb1200_uart_data *data = dev->data;

	*cfg = data->current_config;
	return 0;
	}
	#endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static int kb1200_uart_fifo_fill(const struct device dev, const uint8_t tx_data, int size)
	{
	const struct kb1200_uart_config *config = dev->config;
	uint16_t tx_bytes = 0U;

	while ((size - tx_bytes) > 0) {
	/* Check Tx FIFO not Full*/
	while (config->ser->SERSTS & SERSTS_TX_FULL)
	;
	/* Put a character into Tx FIFO */
	config->ser->SERTBUF = tx_data[tx_bytes];
	tx_bytes++;
	}
	return tx_bytes;
	}

	static int kb1200_uart_fifo_read(const struct device dev, uint8_t rx_data, const int size)
	{
	const struct kb1200_uart_config *config = dev->config;
	uint16_t rx_bytes = 0U;

	/* Check Rx FIFO not Empty*/
	while ((size - rx_bytes > 0) && (!(config->ser->SERSTS & SERSTS_RX_EMPTY))) {
	/* Put a character into Tx FIFO */
	rx_data[rx_bytes] = config->ser->SERRBUF;
	rx_bytes++;
	}
	return rx_bytes;
	}

	static void kb1200_uart_irq_tx_enable(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;

	config->ser->SERPF = SERPF_TX_EMPTY;
	config->ser->SERIE \|= SERIE_TX_ENABLE;
	}

	static void kb1200_uart_irq_tx_disable(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;

	config->ser->SERIE &= ~SERIE_TX_ENABLE;
	config->ser->SERPF = SERPF_TX_EMPTY;
	}

	static int kb1200_uart_irq_tx_ready(const struct device *dev)
	{
	struct kb1200_uart_data *data = dev->data;

	return (data->pending_flag_data & SERPF_TX_EMPTY) ? 1 : 0;
	}

	static void kb1200_uart_irq_rx_enable(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;

	config->ser->SERPF = SERPF_RX_CNT_FULL;
	config->ser->SERIE \|= SERIE_RX_ENABLE;
	}

	static void kb1200_uart_irq_rx_disable(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;

	config->ser->SERIE &= (~SERIE_RX_ENABLE);
	config->ser->SERPF = SERPF_RX_CNT_FULL;
	}

	static int kb1200_uart_irq_rx_ready(const struct device *dev)
	{
	struct kb1200_uart_data *data = dev->data;

	return (data->pending_flag_data & SERPF_RX_CNT_FULL) ? 1 : 0;
	}

	static void kb1200_uart_irq_err_enable(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;

	config->ser->SERPF = SERPF_RX_ERROR;
	config->ser->SERIE \|= SERIE_RX_ERROR;
	}

	static void kb1200_uart_irq_err_disable(const struct device *dev)
	{
	const struct kb1200_uart_config *config = dev->config;

	config->ser->SERIE &= (~SERIE_RX_ERROR);
	config->ser->SERPF = SERPF_RX_ERROR;
	}

	static int kb1200_uart_irq_is_pending(const struct device *dev)
	{
	struct kb1200_uart_data *data = dev->data;

	return (data->pending_flag_data) ? 1 : 0;
	}

	static int kb1200_uart_irq_update(const struct device *dev)
	{
	struct kb1200_uart_data *data = dev->data;
	const struct kb1200_uart_config *config = dev->config;

	data->pending_flag_data = (config->ser->SERPF) & (config->ser->SERIE);
	/clear pending flag/
	config->ser->SERPF = data->pending_flag_data;
	return 1;
	}

	static void kb1200_uart_irq_callback_set(const struct device *dev, uart_irq_callback_user_data_t cb,
	void *cb_data)
	{
	struct kb1200_uart_data *data = dev->data;

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

	static void kb1200_uart_irq_handler(const struct device *dev)
	{
	struct kb1200_uart_data *data = dev->data;

	if (data->callback) {
	data->callback(dev, data->callback_data);
	}
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static int kb1200_uart_poll_in(const struct device dev, unsigned char c)
	{
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	return kb1200_uart_fifo_read(dev, c, 1) ? 0 : -1;
	#else
	const struct kb1200_uart_config *config = dev->config;

	/* Check Rx FIFO not Empty*/
	if (config->ser->SERSTS & SERSTS_RX_EMPTY) {
	return -1;
	}
	/* Put a character into Tx FIFO */
	*c = config->ser->SERRBUF;
	return 0;
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	}

	static void kb1200_uart_poll_out(const struct device *dev, unsigned char c)
	{
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	kb1200_uart_fifo_fill(dev, &c, 1);
	#else
	const struct kb1200_uart_config *config = dev->config;

	/* Wait Tx FIFO not Full*/
	while (config->ser->SERSTS & SER_TxFull) {
	;
	}
	/* Put a character into Tx FIFO */
	config->ser->SERTBUF = c;
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	}

	static const struct uart_driver_api kb1200_uart_api = {
	.poll_in = kb1200_uart_poll_in,
	.poll_out = kb1200_uart_poll_out,
	.err_check = kb1200_uart_err_check,
	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	.configure = kb1200_uart_configure,
	.config_get = kb1200_uart_config_get,
	#endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.fifo_fill = kb1200_uart_fifo_fill,
	.fifo_read = kb1200_uart_fifo_read,
	.irq_tx_enable = kb1200_uart_irq_tx_enable,
	.irq_tx_disable = kb1200_uart_irq_tx_disable,
	.irq_tx_ready = kb1200_uart_irq_tx_ready,
	.irq_rx_enable = kb1200_uart_irq_rx_enable,
	.irq_rx_disable = kb1200_uart_irq_rx_disable,
	.irq_rx_ready = kb1200_uart_irq_rx_ready,
	.irq_err_enable = kb1200_uart_irq_err_enable,
	.irq_err_disable = kb1200_uart_irq_err_disable,
	.irq_is_pending = kb1200_uart_irq_is_pending,
	.irq_update = kb1200_uart_irq_update,
	.irq_callback_set = kb1200_uart_irq_callback_set,
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
	};

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN

	/* GPIO module instances */
	#define KB1200_UART_DEV(inst) DEVICE_DT_INST_GET(inst),
	static const struct device *const uart_devices[] = {DT_INST_FOREACH_STATUS_OKAY(KB1200_UART_DEV)};
	static void kb1200_uart_isr_wrap(const struct device *dev)
	{
	for (size_t i = 0; i < ARRAY_SIZE(uart_devices); i++) {
	const struct device *dev_ = uart_devices[i];
	const struct kb1200_uart_config *config = dev_->config;

	if (config->ser->SERIE & config->ser->SERPF) {
	kb1200_uart_irq_handler(dev_);
	}
	}
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	static int kb1200_uart_init(const struct device *dev)
	{
	int ret;
	const struct kb1200_uart_config *config = dev->config;
	struct kb1200_uart_data *data = dev->data;

	ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
	if (ret != 0) {
	return ret;
	}

	kb1200_uart_configure(dev, &data->current_config);
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	config->irq_cfg_func();
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	return 0;
	}

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static bool init_irq = true;
	static void kb1200_uart_irq_init(void)
	{
	if (init_irq) {
	init_irq = false;
	IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), kb1200_uart_isr_wrap, NULL,
	0);
	irq_enable(DT_INST_IRQN(0));
	}
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	#define KB1200_UART_INIT(n) \
	PINCTRL_DT_INST_DEFINE(n); \
	static struct kb1200_uart_data kb1200_uart_data_##n = { \
	.current_config = { \
	.baudrate = DT_INST_PROP(n, current_speed), \
	.parity = UART_CFG_PARITY_NONE, \
	.stop_bits = UART_CFG_STOP_BITS_1, \
	.data_bits = UART_CFG_DATA_BITS_8, \
	.flow_ctrl = UART_CFG_FLOW_CTRL_NONE, \
	}, \
	}; \
	static const struct kb1200_uart_config kb1200_uart_config_##n = { \
	IF_ENABLED(CONFIG_UART_INTERRUPT_DRIVEN, (.irq_cfg_func = kb1200_uart_irq_init,)) \
	.ser = (struct serial_regs *)DT_INST_REG_ADDR(n), \
	.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n)}; \
	DEVICE_DT_INST_DEFINE(n, &kb1200_uart_init, NULL, &kb1200_uart_data_##n, \
	&kb1200_uart_config_##n, PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY, \
	&kb1200_uart_api);

	DT_INST_FOREACH_STATUS_OKAY(KB1200_UART_INIT)