drivers/i2c/i2c_ifx_cat1.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2023 Cypress Semiconductor Corporation (an Infineon company) or
  * an affiliate of Cypress Semiconductor Corporation
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 /**
  * @brief I2C driver for Infineon CAT1 MCU family.
  */

 #define DT_DRV_COMPAT infineon_cat1_i2c

 #include <zephyr/drivers/i2c.h>
 #include <zephyr/drivers/pinctrl.h>
 #include <cyhal_i2c.h>
 #include <cyhal_utils_impl.h>
 #include <cyhal_utils_impl.h>
 #include <cyhal_scb_common.h>

 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(i2c_infineon_cat1, CONFIG_I2C_LOG_LEVEL);

 #define I2C_CAT1_EVENTS_MASK  (CYHAL_I2C_MASTER_WR_CMPLT_EVENT | CYHAL_I2C_MASTER_RD_CMPLT_EVENT | \
 			       CYHAL_I2C_MASTER_ERR_EVENT)

 #define I2C_CAT1_SLAVE_EVENTS_MASK                                                                 \
 	(CYHAL_I2C_SLAVE_READ_EVENT | CYHAL_I2C_SLAVE_WRITE_EVENT |                                \
 	 CYHAL_I2C_SLAVE_RD_BUF_EMPTY_EVENT | CYHAL_I2C_SLAVE_RD_CMPLT_EVENT |                     \
 	 CYHAL_I2C_SLAVE_WR_CMPLT_EVENT | CYHAL_I2C_SLAVE_RD_BUF_EMPTY_EVENT |                     \
 	 CYHAL_I2C_SLAVE_ERR_EVENT)

 /* States for ASYNC operations */
 #define CAT1_I2C_PENDING_NONE           (0U)
 #define CAT1_I2C_PENDING_RX             (1U)
 #define CAT1_I2C_PENDING_TX             (2U)
 #define CAT1_I2C_PENDING_TX_RX          (3U)

 /* I2C speed */
 #define CAT1_I2C_SPEED_STANDARD_HZ      (100000UL)
 #define CAT1_I2C_SPEED_FAST_HZ          (400000UL)
 #define CAT1_I2C_SPEED_FAST_PLUS_HZ     (1000000UL)

 /* Data structure */
 struct ifx_cat1_i2c_data {
 	cyhal_i2c_t obj;
 	cyhal_i2c_cfg_t cfg;
 	struct k_sem operation_sem;
 	struct k_sem transfer_sem;
 	uint32_t error_status;
 	uint32_t async_pending;
 	cyhal_resource_inst_t hw_resource;
 	cyhal_clock_t clock;
 	struct i2c_target_config *p_target_config;
 	uint8_t i2c_target_wr_byte;
 	uint8_t target_wr_buffer[CONFIG_I2C_INFINEON_CAT1_TARGET_BUF];
 };

 /* Device config structure */
 struct ifx_cat1_i2c_config {
 	uint32_t master_frequency;
 	CySCB_Type *reg_addr;
 	const struct pinctrl_dev_config *pcfg;
 	uint8_t irq_priority;
 };

 /* Default SCB/I2C configuration structure */
 static const cy_stc_scb_i2c_config_t _cyhal_i2c_default_config = {
 	.i2cMode = CY_SCB_I2C_MASTER,
 	.useRxFifo = false,
 	.useTxFifo = true,
 	.slaveAddress = 0U,
 	.slaveAddressMask = 0U,
 	.acceptAddrInFifo = false,
 	.ackGeneralAddr = false,
 	.enableWakeFromSleep = false,
 	.enableDigitalFilter = false,
 	.lowPhaseDutyCycle = 8U,
 	.highPhaseDutyCycle = 8U,
 };

 static int32_t _get_hw_block_num(CySCB_Type *reg_addr)
 {
 	uint32_t i;

 	for (i = 0u; i < _SCB_ARRAY_SIZE; i++) {
 		if (_CYHAL_SCB_BASE_ADDRESSES[i] == reg_addr) {
 			return i;
 		}
 	}

 	return -ENOMEM;
 }

 #ifdef CONFIG_I2C_INFINEON_CAT1_ASYNC
 static void ifx_master_event_handler(void *callback_arg, cyhal_i2c_event_t event)
 {
 	const struct device *dev = (const struct device *) callback_arg;
 	struct ifx_cat1_i2c_data *data = dev->data;

 	if (((CYHAL_I2C_MASTER_ERR_EVENT | CYHAL_I2C_SLAVE_ERR_EVENT) & event) != 0U) {
 		/* In case of error abort transfer */
 		(void)cyhal_i2c_abort_async(&data->obj);
 		data->error_status = 1;
 	}

 	/* Release semaphore if operation complete
 	 * When we have pending TX, RX operations, the semaphore will be released
 	 * after TX, RX complete.
 	 */
 	if (((data->async_pending == CAT1_I2C_PENDING_TX_RX) &&
 	     ((CYHAL_I2C_MASTER_RD_CMPLT_EVENT & event) != 0U)) ||
 	    (data->async_pending != CAT1_I2C_PENDING_TX_RX)) {

 		/* Release semaphore (After I2C async transfer is complete) */
 		k_sem_give(&data->transfer_sem);
 	}

 	if (0 != (CYHAL_I2C_SLAVE_READ_EVENT & event)) {
 		if (data->p_target_config->callbacks->read_requested) {
 			data->p_target_config->callbacks->read_requested(data->p_target_config,
 									 &data->i2c_target_wr_byte);
 			data->obj.context.slaveTxBufferIdx = 0;
 			data->obj.context.slaveTxBufferCnt = 0;
 			data->obj.context.slaveTxBufferSize = 1;
 			data->obj.context.slaveTxBuffer = &data->i2c_target_wr_byte;
 		}
 	}

 	if (0 != (CYHAL_I2C_SLAVE_RD_BUF_EMPTY_EVENT & event)) {
 		if (data->p_target_config->callbacks->read_processed) {
 			data->p_target_config->callbacks->read_processed(data->p_target_config,
 									 &data->i2c_target_wr_byte);
 			data->obj.context.slaveTxBufferIdx = 0;
 			data->obj.context.slaveTxBufferCnt = 0;
 			data->obj.context.slaveTxBufferSize = 1;
 			data->obj.context.slaveTxBuffer = &data->i2c_target_wr_byte;
 		}
 	}

 	if (0 != (CYHAL_I2C_SLAVE_WRITE_EVENT & event)) {
 		cyhal_i2c_slave_config_write_buffer(&data->obj, data->target_wr_buffer,
 						    CONFIG_I2C_INFINEON_CAT1_TARGET_BUF);
 		if (data->p_target_config->callbacks->write_requested) {
 			data->p_target_config->callbacks->write_requested(data->p_target_config);
 		}
 	}

 	if (0 != (CYHAL_I2C_SLAVE_WR_CMPLT_EVENT & event)) {
 		if (data->p_target_config->callbacks->write_received) {
 			for (int i = 0; i < data->obj.context.slaveRxBufferIdx; i++) {
 				data->p_target_config->callbacks->write_received(
 					data->p_target_config, data->target_wr_buffer[i]);
 			}
 		}
 		if (data->p_target_config->callbacks->stop) {
 			data->p_target_config->callbacks->stop(data->p_target_config);
 		}
 	}

 	if (0 != (CYHAL_I2C_SLAVE_RD_CMPLT_EVENT & event)) {
 		if (data->p_target_config->callbacks->stop) {
 			data->p_target_config->callbacks->stop(data->p_target_config);
 		}
 	}
 }
 #endif

 static int ifx_cat1_i2c_configure(const struct device *dev, uint32_t dev_config)
 {
 	struct ifx_cat1_i2c_data *data = dev->data;
 	cy_rslt_t rslt;
 	int ret;

 	if (dev_config != 0) {
 		switch (I2C_SPEED_GET(dev_config)) {
 		case I2C_SPEED_STANDARD:
 			data->cfg.frequencyhal_hz = CAT1_I2C_SPEED_STANDARD_HZ;
 			break;
 		case I2C_SPEED_FAST:
 			data->cfg.frequencyhal_hz = CAT1_I2C_SPEED_FAST_HZ;
 			break;
 		case I2C_SPEED_FAST_PLUS:
 			data->cfg.frequencyhal_hz = CAT1_I2C_SPEED_FAST_PLUS_HZ;
 			break;
 		default:
 			LOG_ERR("Unsupported speed");
 			return -ERANGE;
 		}

 		/* This is deprecated and could be ignored in the future */
 		if (dev_config & I2C_ADDR_10_BITS) {
 			LOG_ERR("10-bit addressing mode is not supported");
 			return -EIO;
 		}
 	}

 	/* Acquire semaphore (block I2C operation for another thread) */
 	ret = k_sem_take(&data->operation_sem, K_FOREVER);
 	if (ret) {
 		return -EIO;
 	}

 	/* Configure the I2C resource to be master */
 	rslt = cyhal_i2c_configure(&data->obj, &data->cfg);
 	if (rslt != CY_RSLT_SUCCESS) {
 		LOG_ERR("cyhal_i2c_configure failed with err 0x%x", rslt);
 		k_sem_give(&data->operation_sem);
 		return -EIO;
 	}

 #ifdef CONFIG_I2C_INFINEON_CAT1_ASYNC
 	/* Register an I2C event callback handler */
 	cyhal_i2c_register_callback(&data->obj, ifx_master_event_handler, (void *)dev);
 #endif
 	/* Release semaphore */
 	k_sem_give(&data->operation_sem);
 	return 0;
 }

 static int ifx_cat1_i2c_get_config(const struct device *dev, uint32_t *dev_config)
 {
 	struct ifx_cat1_i2c_data *data = dev->data;
 	uint32_t config;

 	switch (data->cfg.frequencyhal_hz) {
 	case CAT1_I2C_SPEED_STANDARD_HZ:
 		config = I2C_SPEED_SET(I2C_SPEED_STANDARD);
 		break;
 	case CAT1_I2C_SPEED_FAST_HZ:
 		config = I2C_SPEED_SET(I2C_SPEED_FAST);
 		break;
 	case CAT1_I2C_SPEED_FAST_PLUS_HZ:
 		config = I2C_SPEED_SET(I2C_SPEED_FAST_PLUS);
 		break;
 	default:
 		LOG_ERR("Unsupported speed");
 		return -ERANGE;
 	}

 	/* Return current configuration */
 	*dev_config = config | I2C_MODE_CONTROLLER;

 	return 0;
 }

 static int ifx_cat1_i2c_msg_validate(struct i2c_msg *msg, uint8_t num_msgs)
 {
 	for (uint32_t i = 0u; i < num_msgs; i++) {
 		if ((I2C_MSG_ADDR_10_BITS & msg[i].flags) || (msg[i].buf == NULL)) {
 			return -EINVAL;
 		}
 	}
 	return 0;
 }

 static int ifx_cat1_i2c_transfer(const struct device *dev, struct i2c_msg *msg, uint8_t num_msgs,
 				 uint16_t addr)
 {
 	struct ifx_cat1_i2c_data *data = dev->data;
 	cy_rslt_t rslt = CY_RSLT_SUCCESS;
 	int ret;

 	if (!num_msgs) {
 		return 0;
 	}

 	/* Acquire semaphore (block I2C transfer for another thread) */
 	ret = k_sem_take(&data->operation_sem, K_FOREVER);
 	if (ret) {
 		return -EIO;
 	}

 	/* This function checks if msg.buf is not NULL and if
 	 * target address is not 10 bit.
 	 */
 	if (ifx_cat1_i2c_msg_validate(msg, num_msgs) != 0) {
 		k_sem_give(&data->operation_sem);
 		return -EINVAL;
 	}

 #ifdef CONFIG_I2C_INFINEON_CAT1_ASYNC
 	const struct ifx_cat1_i2c_config *const config = dev->config;

 	struct i2c_msg *tx_msg;
 	struct i2c_msg *rx_msg;

 	data->error_status = 0;
 	data->async_pending = CAT1_I2C_PENDING_NONE;

 	/* Enable I2C Interrupt */
 	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)I2C_CAT1_EVENTS_MASK,
 			       config->irq_priority, true);

 	for (uint32_t i = 0u; i < num_msgs; i++) {
 		tx_msg = NULL;
 		rx_msg = NULL;

 		if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE) {
 			tx_msg = &msg[i];
 			data->async_pending = CAT1_I2C_PENDING_TX;
 		}

 		if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
 			rx_msg = &msg[i];
 			data->async_pending = CAT1_I2C_PENDING_TX;
 		}

 		if ((tx_msg != NULL) && ((i + 1U) < num_msgs) &&
 		    ((msg[i + 1U].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ)) {
 			rx_msg = &msg[i + 1U];
 			i++;
 			data->async_pending = CAT1_I2C_PENDING_TX_RX;
 		}

 		/* Initiate master write and read transfer
 		 * using tx_buff and rx_buff respectively
 		 */
 		rslt = cyhal_i2c_master_transfer_async(&data->obj, addr,
 						       (tx_msg == NULL) ? NULL : tx_msg->buf,
 						       (tx_msg == NULL) ? 0u : tx_msg->len,
 						       (rx_msg == NULL) ? NULL : rx_msg->buf,
 						       (rx_msg == NULL) ? 0u : rx_msg->len);

 		if (rslt != CY_RSLT_SUCCESS) {
 			k_sem_give(&data->operation_sem);
 			return -EIO;
 		}

 		/* Acquire semaphore (block I2C async transfer for another thread) */
 		ret = k_sem_take(&data->transfer_sem, K_FOREVER);
 		if (ret) {
 			k_sem_give(&data->operation_sem);
 			return -EIO;
 		}

 		/* If error_status != 1 we have error during transfer async.
 		 * error_status is handling in master_event_handler function.
 		 */
 		if (data->error_status != 0) {
 			/* Release semaphore */
 			k_sem_give(&data->operation_sem);
 			return -EIO;
 		}
 	}

 	/* Disable I2C Interrupt */
 	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)
 			       I2C_CAT1_EVENTS_MASK, config->irq_priority, false);
 #else
 	for (uint32_t i = 0u; i < num_msgs; i++) {
 		bool stop_flag = ((msg[i].flags & I2C_MSG_STOP) != 0u) ? true : false;

 		if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE) {
 			rslt = cyhal_i2c_master_write(&data->obj,
 						      addr, msg[i].buf, msg[i].len, 0, stop_flag);
 		}
 		if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
 			rslt = cyhal_i2c_master_read(&data->obj,
 						     addr, msg[i].buf, msg[i].len, 0, stop_flag);
 		}

 		if (rslt != CY_RSLT_SUCCESS) {
 			/* Release semaphore */
 			k_sem_give(&data->operation_sem);
 			return -EIO;
 		}
 	}
 #endif
 	/* Release semaphore (After I2C transfer is complete) */
 	k_sem_give(&data->operation_sem);
 	return 0;
 }

 static int ifx_cat1_i2c_init(const struct device *dev)
 {
 	struct ifx_cat1_i2c_data *data = dev->data;
 	const struct ifx_cat1_i2c_config *config = dev->config;
 	cy_rslt_t result;
 	int ret;

 	/* Configuration structure to initialisation I2C */
 	cyhal_i2c_configurator_t i2c_init_cfg = {
 		.resource = &data->hw_resource,
 		.config = &_cyhal_i2c_default_config,
 		.clock = &data->clock,
 	};

 	/* Dedicate SCB HW resource */
 	data->hw_resource.type = CYHAL_RSC_SCB;
 	data->hw_resource.block_num = _get_hw_block_num(config->reg_addr);


 	/* Configure semaphores */
 	ret = k_sem_init(&data->transfer_sem, 0, 1);
 	if (ret) {
 		return ret;
 	}

 	ret = k_sem_init(&data->operation_sem, 1, 1);
 	if (ret) {
 		return ret;
 	}

 	/* Configure dt provided device signals when available */
 	ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
 	if (ret < 0) {
 		return ret;
 	}

 	/* Allocating clock for I2C driver */
 	result = _cyhal_utils_allocate_clock(&data->clock, &data->hw_resource,
 					     CYHAL_CLOCK_BLOCK_PERIPHERAL_16BIT, true);
 	if (result != CY_RSLT_SUCCESS) {
 		return -ENOTSUP;
 	}

 	/* Assigns a programmable divider to a selected IP block */
 	en_clk_dst_t clk_idx = _cyhal_scb_get_clock_index(i2c_init_cfg.resource->block_num);

 	result = _cyhal_utils_peri_pclk_assign_divider(clk_idx, i2c_init_cfg.clock);
 	if (result != CY_RSLT_SUCCESS) {
 		return -ENOTSUP;
 	}

 	/* Initialize the I2C peripheral */
 	result = cyhal_i2c_init_cfg(&data->obj, &i2c_init_cfg);
 	if (result != CY_RSLT_SUCCESS) {
 		return -ENOTSUP;
 	}
 	data->obj.is_clock_owned = true;

 	/* Store Master initial configuration */
 	data->cfg.is_slave = false;
 	data->cfg.address = 0;
 	data->cfg.frequencyhal_hz = config->master_frequency;

 	if (ifx_cat1_i2c_configure(dev, 0) != 0) {
 		/* Free I2C resource */
 		cyhal_i2c_free(&data->obj);
 	}
 	return 0;
 }

 static int ifx_cat1_i2c_target_register(const struct device *dev, struct i2c_target_config *cfg)
 {
 	struct ifx_cat1_i2c_data *data = (struct ifx_cat1_i2c_data *)dev->data;
 	const struct ifx_cat1_i2c_config *config = dev->config;

 	if (!cfg) {
 		return -EINVAL;
 	}

 	if (cfg->flags & I2C_TARGET_FLAGS_ADDR_10_BITS) {
 		return -ENOTSUP;
 	}

 	data->p_target_config = cfg;
 	data->cfg.is_slave = true;
 	data->cfg.address = data->p_target_config->address;
 	data->cfg.frequencyhal_hz = 100000;

 	if (ifx_cat1_i2c_configure(dev, I2C_SPEED_SET(I2C_SPEED_FAST)) != 0) {
 		/* Free I2C resource */
 		cyhal_i2c_free(&data->obj);
 		/* Release semaphore */
 		k_sem_give(&data->operation_sem);
 		return -EIO;
 	}

 	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)I2C_CAT1_SLAVE_EVENTS_MASK,
 			       config->irq_priority, true);
 	return 0;
 }

 static int ifx_cat1_i2c_target_unregister(const struct device *dev, struct i2c_target_config *cfg)
 {
 	struct ifx_cat1_i2c_data *data = (struct ifx_cat1_i2c_data *)dev->data;
 	const struct ifx_cat1_i2c_config *config = dev->config;

 	/* Acquire semaphore (block I2C operation for another thread) */
 	k_sem_take(&data->operation_sem, K_FOREVER);

 	cyhal_i2c_free(&data->obj);
 	data->p_target_config = NULL;
 	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)I2C_CAT1_SLAVE_EVENTS_MASK,
 			       config->irq_priority, false);

 	/* Release semaphore */
 	k_sem_give(&data->operation_sem);
 	return 0;
 }

 /* I2C API structure */
 static const struct i2c_driver_api i2c_cat1_driver_api = {
 	.configure = ifx_cat1_i2c_configure,
 	.transfer = ifx_cat1_i2c_transfer,
 	.get_config = ifx_cat1_i2c_get_config,
 	.target_register = ifx_cat1_i2c_target_register,
 	.target_unregister = ifx_cat1_i2c_target_unregister,
 #ifdef CONFIG_I2C_RTIO
 	.iodev_submit = i2c_iodev_submit_fallback,
 #endif
 };

 /* Macros for I2C instance declaration */
 #define INFINEON_CAT1_I2C_INIT(n)                                                                  \
 	PINCTRL_DT_INST_DEFINE(n);                                                                 \
                                                                                                    \
 	static struct ifx_cat1_i2c_data ifx_cat1_i2c_data##n;                                      \
                                                                                                    \
 	static const struct ifx_cat1_i2c_config i2c_cat1_cfg_##n = {                               \
 		.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),                                         \
 		.master_frequency = DT_INST_PROP_OR(n, clock_frequency, 100000),                   \
 		.reg_addr = (CySCB_Type *)DT_INST_REG_ADDR(n),                                     \
 		.irq_priority = DT_INST_IRQ(n, priority),                                          \
 	};                                                                                         \
                                                                                                    \
 	I2C_DEVICE_DT_INST_DEFINE(n, ifx_cat1_i2c_init, NULL, &ifx_cat1_i2c_data##n,               \
 				  &i2c_cat1_cfg_##n, POST_KERNEL,                                  \
 				  CONFIG_I2C_INIT_PRIORITY, &i2c_cat1_driver_api);

 DT_INST_FOREACH_STATUS_OKAY(INFINEON_CAT1_I2C_INIT)
	/*
	* Copyright (c) 2023 Cypress Semiconductor Corporation (an Infineon company) or
	* an affiliate of Cypress Semiconductor Corporation
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	/**
	* @brief I2C driver for Infineon CAT1 MCU family.
	*/

	#define DT_DRV_COMPAT infineon_cat1_i2c

	#include <zephyr/drivers/i2c.h>
	#include <zephyr/drivers/pinctrl.h>
	#include <cyhal_i2c.h>
	#include <cyhal_utils_impl.h>
	#include <cyhal_utils_impl.h>
	#include <cyhal_scb_common.h>

	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(i2c_infineon_cat1, CONFIG_I2C_LOG_LEVEL);

	#define I2C_CAT1_EVENTS_MASK (CYHAL_I2C_MASTER_WR_CMPLT_EVENT \| CYHAL_I2C_MASTER_RD_CMPLT_EVENT \| \
	CYHAL_I2C_MASTER_ERR_EVENT)

	#define I2C_CAT1_SLAVE_EVENTS_MASK \
	(CYHAL_I2C_SLAVE_READ_EVENT \| CYHAL_I2C_SLAVE_WRITE_EVENT \| \
	CYHAL_I2C_SLAVE_RD_BUF_EMPTY_EVENT \| CYHAL_I2C_SLAVE_RD_CMPLT_EVENT \| \
	CYHAL_I2C_SLAVE_WR_CMPLT_EVENT \| CYHAL_I2C_SLAVE_RD_BUF_EMPTY_EVENT \| \
	CYHAL_I2C_SLAVE_ERR_EVENT)

	/* States for ASYNC operations */
	#define CAT1_I2C_PENDING_NONE (0U)
	#define CAT1_I2C_PENDING_RX (1U)
	#define CAT1_I2C_PENDING_TX (2U)
	#define CAT1_I2C_PENDING_TX_RX (3U)

	/* I2C speed */
	#define CAT1_I2C_SPEED_STANDARD_HZ (100000UL)
	#define CAT1_I2C_SPEED_FAST_HZ (400000UL)
	#define CAT1_I2C_SPEED_FAST_PLUS_HZ (1000000UL)

	/* Data structure */
	struct ifx_cat1_i2c_data {
	cyhal_i2c_t obj;
	cyhal_i2c_cfg_t cfg;
	struct k_sem operation_sem;
	struct k_sem transfer_sem;
	uint32_t error_status;
	uint32_t async_pending;
	cyhal_resource_inst_t hw_resource;
	cyhal_clock_t clock;
	struct i2c_target_config *p_target_config;
	uint8_t i2c_target_wr_byte;
	uint8_t target_wr_buffer[CONFIG_I2C_INFINEON_CAT1_TARGET_BUF];
	};

	/* Device config structure */
	struct ifx_cat1_i2c_config {
	uint32_t master_frequency;
	CySCB_Type *reg_addr;
	const struct pinctrl_dev_config *pcfg;
	uint8_t irq_priority;
	};

	/* Default SCB/I2C configuration structure */
	static const cy_stc_scb_i2c_config_t _cyhal_i2c_default_config = {
	.i2cMode = CY_SCB_I2C_MASTER,
	.useRxFifo = false,
	.useTxFifo = true,
	.slaveAddress = 0U,
	.slaveAddressMask = 0U,
	.acceptAddrInFifo = false,
	.ackGeneralAddr = false,
	.enableWakeFromSleep = false,
	.enableDigitalFilter = false,
	.lowPhaseDutyCycle = 8U,
	.highPhaseDutyCycle = 8U,
	};

	static int32_t _get_hw_block_num(CySCB_Type *reg_addr)
	{
	uint32_t i;

	for (i = 0u; i < _SCB_ARRAY_SIZE; i++) {
	if (_CYHAL_SCB_BASE_ADDRESSES[i] == reg_addr) {
	return i;
	}
	}

	return -ENOMEM;
	}

	#ifdef CONFIG_I2C_INFINEON_CAT1_ASYNC
	static void ifx_master_event_handler(void *callback_arg, cyhal_i2c_event_t event)
	{
	const struct device dev = (const struct device ) callback_arg;
	struct ifx_cat1_i2c_data *data = dev->data;

	if (((CYHAL_I2C_MASTER_ERR_EVENT \| CYHAL_I2C_SLAVE_ERR_EVENT) & event) != 0U) {
	/* In case of error abort transfer */
	(void)cyhal_i2c_abort_async(&data->obj);
	data->error_status = 1;
	}

	/* Release semaphore if operation complete
	* When we have pending TX, RX operations, the semaphore will be released
	* after TX, RX complete.
	*/
	if (((data->async_pending == CAT1_I2C_PENDING_TX_RX) &&
	((CYHAL_I2C_MASTER_RD_CMPLT_EVENT & event) != 0U)) \|\|
	(data->async_pending != CAT1_I2C_PENDING_TX_RX)) {

	/* Release semaphore (After I2C async transfer is complete) */
	k_sem_give(&data->transfer_sem);
	}

	if (0 != (CYHAL_I2C_SLAVE_READ_EVENT & event)) {
	if (data->p_target_config->callbacks->read_requested) {
	data->p_target_config->callbacks->read_requested(data->p_target_config,
	&data->i2c_target_wr_byte);
	data->obj.context.slaveTxBufferIdx = 0;
	data->obj.context.slaveTxBufferCnt = 0;
	data->obj.context.slaveTxBufferSize = 1;
	data->obj.context.slaveTxBuffer = &data->i2c_target_wr_byte;
	}
	}

	if (0 != (CYHAL_I2C_SLAVE_RD_BUF_EMPTY_EVENT & event)) {
	if (data->p_target_config->callbacks->read_processed) {
	data->p_target_config->callbacks->read_processed(data->p_target_config,
	&data->i2c_target_wr_byte);
	data->obj.context.slaveTxBufferIdx = 0;
	data->obj.context.slaveTxBufferCnt = 0;
	data->obj.context.slaveTxBufferSize = 1;
	data->obj.context.slaveTxBuffer = &data->i2c_target_wr_byte;
	}
	}

	if (0 != (CYHAL_I2C_SLAVE_WRITE_EVENT & event)) {
	cyhal_i2c_slave_config_write_buffer(&data->obj, data->target_wr_buffer,
	CONFIG_I2C_INFINEON_CAT1_TARGET_BUF);
	if (data->p_target_config->callbacks->write_requested) {
	data->p_target_config->callbacks->write_requested(data->p_target_config);
	}
	}

	if (0 != (CYHAL_I2C_SLAVE_WR_CMPLT_EVENT & event)) {
	if (data->p_target_config->callbacks->write_received) {
	for (int i = 0; i < data->obj.context.slaveRxBufferIdx; i++) {
	data->p_target_config->callbacks->write_received(
	data->p_target_config, data->target_wr_buffer[i]);
	}
	}
	if (data->p_target_config->callbacks->stop) {
	data->p_target_config->callbacks->stop(data->p_target_config);
	}
	}

	if (0 != (CYHAL_I2C_SLAVE_RD_CMPLT_EVENT & event)) {
	if (data->p_target_config->callbacks->stop) {
	data->p_target_config->callbacks->stop(data->p_target_config);
	}
	}
	}
	#endif

	static int ifx_cat1_i2c_configure(const struct device *dev, uint32_t dev_config)
	{
	struct ifx_cat1_i2c_data *data = dev->data;
	cy_rslt_t rslt;
	int ret;

	if (dev_config != 0) {
	switch (I2C_SPEED_GET(dev_config)) {
	case I2C_SPEED_STANDARD:
	data->cfg.frequencyhal_hz = CAT1_I2C_SPEED_STANDARD_HZ;
	break;
	case I2C_SPEED_FAST:
	data->cfg.frequencyhal_hz = CAT1_I2C_SPEED_FAST_HZ;
	break;
	case I2C_SPEED_FAST_PLUS:
	data->cfg.frequencyhal_hz = CAT1_I2C_SPEED_FAST_PLUS_HZ;
	break;
	default:
	LOG_ERR("Unsupported speed");
	return -ERANGE;
	}

	/* This is deprecated and could be ignored in the future */
	if (dev_config & I2C_ADDR_10_BITS) {
	LOG_ERR("10-bit addressing mode is not supported");
	return -EIO;
	}
	}

	/* Acquire semaphore (block I2C operation for another thread) */
	ret = k_sem_take(&data->operation_sem, K_FOREVER);
	if (ret) {
	return -EIO;
	}

	/* Configure the I2C resource to be master */
	rslt = cyhal_i2c_configure(&data->obj, &data->cfg);
	if (rslt != CY_RSLT_SUCCESS) {
	LOG_ERR("cyhal_i2c_configure failed with err 0x%x", rslt);
	k_sem_give(&data->operation_sem);
	return -EIO;
	}

	#ifdef CONFIG_I2C_INFINEON_CAT1_ASYNC
	/* Register an I2C event callback handler */
	cyhal_i2c_register_callback(&data->obj, ifx_master_event_handler, (void *)dev);
	#endif
	/* Release semaphore */
	k_sem_give(&data->operation_sem);
	return 0;
	}

	static int ifx_cat1_i2c_get_config(const struct device dev, uint32_t dev_config)
	{
	struct ifx_cat1_i2c_data *data = dev->data;
	uint32_t config;

	switch (data->cfg.frequencyhal_hz) {
	case CAT1_I2C_SPEED_STANDARD_HZ:
	config = I2C_SPEED_SET(I2C_SPEED_STANDARD);
	break;
	case CAT1_I2C_SPEED_FAST_HZ:
	config = I2C_SPEED_SET(I2C_SPEED_FAST);
	break;
	case CAT1_I2C_SPEED_FAST_PLUS_HZ:
	config = I2C_SPEED_SET(I2C_SPEED_FAST_PLUS);
	break;
	default:
	LOG_ERR("Unsupported speed");
	return -ERANGE;
	}

	/* Return current configuration */
	*dev_config = config \| I2C_MODE_CONTROLLER;

	return 0;
	}

	static int ifx_cat1_i2c_msg_validate(struct i2c_msg *msg, uint8_t num_msgs)
	{
	for (uint32_t i = 0u; i < num_msgs; i++) {
	if ((I2C_MSG_ADDR_10_BITS & msg[i].flags) \|\| (msg[i].buf == NULL)) {
	return -EINVAL;
	}
	}
	return 0;
	}

	static int ifx_cat1_i2c_transfer(const struct device dev, struct i2c_msg msg, uint8_t num_msgs,
	uint16_t addr)
	{
	struct ifx_cat1_i2c_data *data = dev->data;
	cy_rslt_t rslt = CY_RSLT_SUCCESS;
	int ret;

	if (!num_msgs) {
	return 0;
	}

	/* Acquire semaphore (block I2C transfer for another thread) */
	ret = k_sem_take(&data->operation_sem, K_FOREVER);
	if (ret) {
	return -EIO;
	}

	/* This function checks if msg.buf is not NULL and if
	* target address is not 10 bit.
	*/
	if (ifx_cat1_i2c_msg_validate(msg, num_msgs) != 0) {
	k_sem_give(&data->operation_sem);
	return -EINVAL;
	}

	#ifdef CONFIG_I2C_INFINEON_CAT1_ASYNC
	const struct ifx_cat1_i2c_config *const config = dev->config;

	struct i2c_msg *tx_msg;
	struct i2c_msg *rx_msg;

	data->error_status = 0;
	data->async_pending = CAT1_I2C_PENDING_NONE;

	/* Enable I2C Interrupt */
	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)I2C_CAT1_EVENTS_MASK,
	config->irq_priority, true);

	for (uint32_t i = 0u; i < num_msgs; i++) {
	tx_msg = NULL;
	rx_msg = NULL;

	if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE) {
	tx_msg = &msg[i];
	data->async_pending = CAT1_I2C_PENDING_TX;
	}

	if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
	rx_msg = &msg[i];
	data->async_pending = CAT1_I2C_PENDING_TX;
	}

	if ((tx_msg != NULL) && ((i + 1U) < num_msgs) &&
	((msg[i + 1U].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ)) {
	rx_msg = &msg[i + 1U];
	i++;
	data->async_pending = CAT1_I2C_PENDING_TX_RX;
	}

	/* Initiate master write and read transfer
	* using tx_buff and rx_buff respectively
	*/
	rslt = cyhal_i2c_master_transfer_async(&data->obj, addr,
	(tx_msg == NULL) ? NULL : tx_msg->buf,
	(tx_msg == NULL) ? 0u : tx_msg->len,
	(rx_msg == NULL) ? NULL : rx_msg->buf,
	(rx_msg == NULL) ? 0u : rx_msg->len);

	if (rslt != CY_RSLT_SUCCESS) {
	k_sem_give(&data->operation_sem);
	return -EIO;
	}

	/* Acquire semaphore (block I2C async transfer for another thread) */
	ret = k_sem_take(&data->transfer_sem, K_FOREVER);
	if (ret) {
	k_sem_give(&data->operation_sem);
	return -EIO;
	}

	/* If error_status != 1 we have error during transfer async.
	* error_status is handling in master_event_handler function.
	*/
	if (data->error_status != 0) {
	/* Release semaphore */
	k_sem_give(&data->operation_sem);
	return -EIO;
	}
	}

	/* Disable I2C Interrupt */
	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)
	I2C_CAT1_EVENTS_MASK, config->irq_priority, false);
	#else
	for (uint32_t i = 0u; i < num_msgs; i++) {
	bool stop_flag = ((msg[i].flags & I2C_MSG_STOP) != 0u) ? true : false;

	if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE) {
	rslt = cyhal_i2c_master_write(&data->obj,
	addr, msg[i].buf, msg[i].len, 0, stop_flag);
	}
	if ((msg[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
	rslt = cyhal_i2c_master_read(&data->obj,
	addr, msg[i].buf, msg[i].len, 0, stop_flag);
	}

	if (rslt != CY_RSLT_SUCCESS) {
	/* Release semaphore */
	k_sem_give(&data->operation_sem);
	return -EIO;
	}
	}
	#endif
	/* Release semaphore (After I2C transfer is complete) */
	k_sem_give(&data->operation_sem);
	return 0;
	}

	static int ifx_cat1_i2c_init(const struct device *dev)
	{
	struct ifx_cat1_i2c_data *data = dev->data;
	const struct ifx_cat1_i2c_config *config = dev->config;
	cy_rslt_t result;
	int ret;

	/* Configuration structure to initialisation I2C */
	cyhal_i2c_configurator_t i2c_init_cfg = {
	.resource = &data->hw_resource,
	.config = &_cyhal_i2c_default_config,
	.clock = &data->clock,
	};

	/* Dedicate SCB HW resource */
	data->hw_resource.type = CYHAL_RSC_SCB;
	data->hw_resource.block_num = _get_hw_block_num(config->reg_addr);


	/* Configure semaphores */
	ret = k_sem_init(&data->transfer_sem, 0, 1);
	if (ret) {
	return ret;
	}

	ret = k_sem_init(&data->operation_sem, 1, 1);
	if (ret) {
	return ret;
	}

	/* Configure dt provided device signals when available */
	ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
	if (ret < 0) {
	return ret;
	}

	/* Allocating clock for I2C driver */
	result = _cyhal_utils_allocate_clock(&data->clock, &data->hw_resource,
	CYHAL_CLOCK_BLOCK_PERIPHERAL_16BIT, true);
	if (result != CY_RSLT_SUCCESS) {
	return -ENOTSUP;
	}

	/* Assigns a programmable divider to a selected IP block */
	en_clk_dst_t clk_idx = _cyhal_scb_get_clock_index(i2c_init_cfg.resource->block_num);

	result = _cyhal_utils_peri_pclk_assign_divider(clk_idx, i2c_init_cfg.clock);
	if (result != CY_RSLT_SUCCESS) {
	return -ENOTSUP;
	}

	/* Initialize the I2C peripheral */
	result = cyhal_i2c_init_cfg(&data->obj, &i2c_init_cfg);
	if (result != CY_RSLT_SUCCESS) {
	return -ENOTSUP;
	}
	data->obj.is_clock_owned = true;

	/* Store Master initial configuration */
	data->cfg.is_slave = false;
	data->cfg.address = 0;
	data->cfg.frequencyhal_hz = config->master_frequency;

	if (ifx_cat1_i2c_configure(dev, 0) != 0) {
	/* Free I2C resource */
	cyhal_i2c_free(&data->obj);
	}
	return 0;
	}

	static int ifx_cat1_i2c_target_register(const struct device dev, struct i2c_target_config cfg)
	{
	struct ifx_cat1_i2c_data data = (struct ifx_cat1_i2c_data )dev->data;
	const struct ifx_cat1_i2c_config *config = dev->config;

	if (!cfg) {
	return -EINVAL;
	}

	if (cfg->flags & I2C_TARGET_FLAGS_ADDR_10_BITS) {
	return -ENOTSUP;
	}

	data->p_target_config = cfg;
	data->cfg.is_slave = true;
	data->cfg.address = data->p_target_config->address;
	data->cfg.frequencyhal_hz = 100000;

	if (ifx_cat1_i2c_configure(dev, I2C_SPEED_SET(I2C_SPEED_FAST)) != 0) {
	/* Free I2C resource */
	cyhal_i2c_free(&data->obj);
	/* Release semaphore */
	k_sem_give(&data->operation_sem);
	return -EIO;
	}

	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)I2C_CAT1_SLAVE_EVENTS_MASK,
	config->irq_priority, true);
	return 0;
	}

	static int ifx_cat1_i2c_target_unregister(const struct device dev, struct i2c_target_config cfg)
	{
	struct ifx_cat1_i2c_data data = (struct ifx_cat1_i2c_data )dev->data;
	const struct ifx_cat1_i2c_config *config = dev->config;

	/* Acquire semaphore (block I2C operation for another thread) */
	k_sem_take(&data->operation_sem, K_FOREVER);

	cyhal_i2c_free(&data->obj);
	data->p_target_config = NULL;
	cyhal_i2c_enable_event(&data->obj, (cyhal_i2c_event_t)I2C_CAT1_SLAVE_EVENTS_MASK,
	config->irq_priority, false);

	/* Release semaphore */
	k_sem_give(&data->operation_sem);
	return 0;
	}

	/* I2C API structure */
	static const struct i2c_driver_api i2c_cat1_driver_api = {
	.configure = ifx_cat1_i2c_configure,
	.transfer = ifx_cat1_i2c_transfer,
	.get_config = ifx_cat1_i2c_get_config,
	.target_register = ifx_cat1_i2c_target_register,
	.target_unregister = ifx_cat1_i2c_target_unregister,
	#ifdef CONFIG_I2C_RTIO
	.iodev_submit = i2c_iodev_submit_fallback,
	#endif
	};

	/* Macros for I2C instance declaration */
	#define INFINEON_CAT1_I2C_INIT(n) \
	PINCTRL_DT_INST_DEFINE(n); \
	\
	static struct ifx_cat1_i2c_data ifx_cat1_i2c_data##n; \
	\
	static const struct ifx_cat1_i2c_config i2c_cat1_cfg_##n = { \
	.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
	.master_frequency = DT_INST_PROP_OR(n, clock_frequency, 100000), \
	.reg_addr = (CySCB_Type *)DT_INST_REG_ADDR(n), \
	.irq_priority = DT_INST_IRQ(n, priority), \
	}; \
	\
	I2C_DEVICE_DT_INST_DEFINE(n, ifx_cat1_i2c_init, NULL, &ifx_cat1_i2c_data##n, \
	&i2c_cat1_cfg_##n, POST_KERNEL, \
	CONFIG_I2C_INIT_PRIORITY, &i2c_cat1_driver_api);

	DT_INST_FOREACH_STATUS_OKAY(INFINEON_CAT1_I2C_INIT)