drivers/ipm/ipm_stm32_ipcc.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2019 ST Microelectronics Limited
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT st_stm32_ipcc_mailbox

 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/device.h>
 #include <errno.h>
 #include <zephyr/drivers/ipm.h>
 #include <soc.h>
 #include <stm32_ll_ipcc.h>

 #include <zephyr/drivers/clock_control/stm32_clock_control.h>

 #include <zephyr/logging/log.h>
 #include <zephyr/irq.h>
 LOG_MODULE_REGISTER(ipm_stm32_ipcc, CONFIG_IPM_LOG_LEVEL);

 #define MBX_STRUCT(dev)					\
 	((IPCC_TypeDef *)				\
 	 ((const struct stm32_ipcc_mailbox_config * const)(dev)->config)->uconf.base)

 #define IPCC_ALL_MR_TXF_CH_MASK 0xFFFF0000
 #define IPCC_ALL_MR_RXO_CH_MASK 0x0000FFFF
 #define IPCC_ALL_SR_CH_MASK	0x0000FFFF

 #if (CONFIG_IPM_STM32_IPCC_PROCID == 1)

 #define IPCC_EnableIT_TXF(hipcc)  LL_C1_IPCC_EnableIT_TXF(hipcc)
 #define IPCC_DisableIT_TXF(hipcc)  LL_C1_IPCC_DisableIT_TXF(hipcc)

 #define IPCC_EnableIT_RXO(hipcc)  LL_C1_IPCC_EnableIT_RXO(hipcc)
 #define IPCC_DisableIT_RXO(hipcc)  LL_C1_IPCC_DisableIT_RXO(hipcc)

 #define IPCC_EnableReceiveChannel(hipcc, ch)	\
 			LL_C1_IPCC_EnableReceiveChannel(hipcc, 1 << ch)
 #define IPCC_EnableTransmitChannel(hipcc, ch)	\
 			LL_C1_IPCC_EnableTransmitChannel(hipcc, 1 << ch)
 #define IPCC_DisableReceiveChannel(hipcc, ch)	\
 			LL_C2_IPCC_DisableReceiveChannel(hipcc, 1 << ch)
 #define IPCC_DisableTransmitChannel(hipcc, ch)	\
 			LL_C1_IPCC_DisableTransmitChannel(hipcc, 1 << ch)

 #define IPCC_ClearFlag_CHx(hipcc, ch)	LL_C1_IPCC_ClearFlag_CHx(hipcc, 1 << ch)
 #define IPCC_SetFlag_CHx(hipcc, ch)	LL_C1_IPCC_SetFlag_CHx(hipcc, 1 << ch)

 #define IPCC_IsActiveFlag_CHx(hipcc, ch)	\
 			LL_C1_IPCC_IsActiveFlag_CHx(hipcc, 1 << ch)

 #define IPCC_ReadReg(hipcc, reg) READ_REG(hipcc->C1##reg)

 #define IPCC_ReadReg_SR(hipcc) READ_REG(hipcc->C1TOC2SR)
 #define IPCC_ReadOtherInstReg_SR(hipcc) READ_REG(hipcc->C2TOC1SR)

 #else

 #define IPCC_EnableIT_TXF(hipcc)  LL_C2_IPCC_EnableIT_TXF(hipcc)
 #define IPCC_DisableIT_TXF(hipcc)  LL_C2_IPCC_DisableIT_TXF(hipcc)

 #define IPCC_EnableIT_RXO(hipcc)  LL_C2_IPCC_EnableIT_RXO(hipcc)
 #define IPCC_DisableIT_RXO(hipcc)  LL_C2_IPCC_DisableIT_RXO(hipcc)

 #define IPCC_EnableReceiveChannel(hipcc, ch)	\
 			LL_C2_IPCC_EnableReceiveChannel(hipcc, 1 << ch)
 #define IPCC_EnableTransmitChannel(hipcc, ch)	\
 			LL_C2_IPCC_EnableTransmitChannel(hipcc, 1 << ch)
 #define IPCC_DisableReceiveChannel(hipcc, ch)	\
 			LL_C2_IPCC_DisableReceiveChannel(hipcc, 1 << ch)
 #define IPCC_DisableTransmitChannel(hipcc, ch)	\
 			LL_C2_IPCC_DisableTransmitChannel(hipcc, 1 << ch)

 #define IPCC_ClearFlag_CHx(hipcc, ch)	LL_C2_IPCC_ClearFlag_CHx(hipcc, 1 << ch)
 #define IPCC_SetFlag_CHx(hipcc, ch)	LL_C2_IPCC_SetFlag_CHx(hipcc, 1 << ch)

 #define IPCC_IsActiveFlag_CHx(hipcc, ch)	\
 			LL_C2_IPCC_IsActiveFlag_CHx(hipcc, 1 << ch)

 #define IPCC_ReadReg(hipcc, reg) READ_REG(hipcc->C2##reg)

 #define IPCC_ReadReg_SR(hipcc) READ_REG(hipcc->C2TOC1SR)
 #define IPCC_ReadOtherInstReg_SR(hipcc) READ_REG(hipcc->C1TOC2SR)

 #endif

 struct stm32_ipcc_mailbox_config {
 	void (*irq_config_func)(const struct device *dev);
 	IPCC_TypeDef *ipcc;
 	struct stm32_pclken pclken;
 };

 struct stm32_ipcc_mbx_data {
 	uint32_t num_ch;
 	ipm_callback_t callback;
 	void *user_data;
 };

 static struct stm32_ipcc_mbx_data stm32_IPCC_data;

 static void stm32_ipcc_mailbox_rx_isr(const struct device *dev)
 {
 	struct stm32_ipcc_mbx_data *data = dev->data;
 	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
 	unsigned int value = 0;
 	uint32_t mask, i;

 	mask = (~IPCC_ReadReg(cfg->ipcc, MR)) & IPCC_ALL_MR_RXO_CH_MASK;
 	mask &= IPCC_ReadOtherInstReg_SR(cfg->ipcc) & IPCC_ALL_SR_CH_MASK;

 	for (i = 0; i < data->num_ch; i++) {
 		if (!((1 << i) & mask)) {
 			continue;
 		}
 		LOG_DBG("%s channel = %x\r\n", __func__, i);
 		/* mask the channel Free interrupt  */
 		IPCC_DisableReceiveChannel(cfg->ipcc, i);

 		if (data->callback) {
 			/* Only one MAILBOX, id is unused and set to 0 */
 			data->callback(dev, data->user_data, i, &value);
 		}
 		/* clear status to acknowledge message reception */
 		IPCC_ClearFlag_CHx(cfg->ipcc, i);
 		IPCC_EnableReceiveChannel(cfg->ipcc, i);
 	}
 }

 static void stm32_ipcc_mailbox_tx_isr(const struct device *dev)
 {
 	struct stm32_ipcc_mbx_data *data = dev->data;
 	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
 	uint32_t mask, i;

 	mask = (~IPCC_ReadReg(cfg->ipcc, MR)) & IPCC_ALL_MR_TXF_CH_MASK;
 	mask = mask >> IPCC_C1MR_CH1FM_Pos;

 	mask &= ~IPCC_ReadReg_SR(cfg->ipcc) & IPCC_ALL_SR_CH_MASK;

 	for (i = 0; i <  data->num_ch; i++) {
 		if (!((1 << i) & mask)) {
 			continue;
 		}
 		LOG_DBG("%s channel = %x\r\n", __func__, i);
 		/* mask the channel Free interrupt */
 		IPCC_DisableTransmitChannel(cfg->ipcc, i);
 	}
 }

 static int stm32_ipcc_mailbox_ipm_send(const struct device *dev, int wait,
 				       uint32_t id,
 				       const void *buff, int size)
 {
 	struct stm32_ipcc_mbx_data *data = dev->data;
 	const struct stm32_ipcc_mailbox_config *cfg = dev->config;

 	ARG_UNUSED(wait);
 	ARG_UNUSED(buff);

 	/* No data transmission, only doorbell */
 	if (size) {
 		return -EMSGSIZE;
 	}

 	if (id >= data->num_ch) {
 		LOG_ERR("invalid id (%d)\r\n", id);
 		return  -EINVAL;
 	}

 	LOG_DBG("Send msg on channel %d\r\n", id);

 	/* Check that the channel is free (otherwise wait) */
 	if (IPCC_IsActiveFlag_CHx(cfg->ipcc, id)) {
 		LOG_DBG("Waiting for channel to be freed\r\n");
 		while (IPCC_IsActiveFlag_CHx(cfg->ipcc, id)) {
 			;
 		}
 	}
 	IPCC_EnableTransmitChannel(cfg->ipcc, id);
 	IPCC_SetFlag_CHx(cfg->ipcc, id);

 	return 0;
 }

 static int stm32_ipcc_mailbox_ipm_max_data_size_get(const struct device *dev)
 {
 	ARG_UNUSED(dev);

 	/* no data transfer capability */
 	return 0;
 }

 static uint32_t stm32_ipcc_mailbox_ipm_max_id_val_get(const struct device *d)
 {
 	struct stm32_ipcc_mbx_data *data = d->data;

 	return data->num_ch - 1;
 }

 static void stm32_ipcc_mailbox_ipm_register_callback(const struct device *d,
 						     ipm_callback_t cb,
 						     void *user_data)
 {
 	struct stm32_ipcc_mbx_data *data = d->data;

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

 static int stm32_ipcc_mailbox_ipm_set_enabled(const struct device *dev,
 					      int enable)
 {
 	struct stm32_ipcc_mbx_data *data = dev->data;
 	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
 	uint32_t i;

 	/* For now: nothing to be done */
 	LOG_DBG("%s %s mailbox\r\n", __func__, enable ? "enable" : "disable");
 	if (enable) {
 		/* Enable RX and TX interrupts */
 		IPCC_EnableIT_TXF(cfg->ipcc);
 		IPCC_EnableIT_RXO(cfg->ipcc);
 		for (i = 0; i < data->num_ch; i++) {
 			IPCC_EnableReceiveChannel(cfg->ipcc, i);
 		}
 	} else {
 		/* Disable RX and TX interrupts */
 		IPCC_DisableIT_TXF(cfg->ipcc);
 		IPCC_DisableIT_RXO(cfg->ipcc);
 		for (i = 0; i < data->num_ch; i++) {
 			IPCC_DisableReceiveChannel(cfg->ipcc, i);
 		}
 	}

 	return 0;
 }

 static int stm32_ipcc_mailbox_init(const struct device *dev)
 {

 	struct stm32_ipcc_mbx_data *data = dev->data;
 	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
 	const struct device *clk;
 	uint32_t i;

 	clk = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);

 	if (!device_is_ready(clk)) {
 		LOG_ERR("clock control device not ready");
 		return -ENODEV;
 	}

 	/* enable clock */
 	if (clock_control_on(clk,
 			     (clock_control_subsys_t)&cfg->pclken) != 0) {
 		return -EIO;
 	}

 	/* Disable RX and TX interrupts */
 	IPCC_DisableIT_TXF(cfg->ipcc);
 	IPCC_DisableIT_RXO(cfg->ipcc);

 	data->num_ch = LL_IPCC_GetChannelConfig(cfg->ipcc);

 	for (i = 0; i < data->num_ch; i++) {
 		/* Clear RX status */
 		IPCC_ClearFlag_CHx(cfg->ipcc, i);
 		/* mask RX and TX interrupts */
 		IPCC_DisableReceiveChannel(cfg->ipcc, i);
 		IPCC_DisableTransmitChannel(cfg->ipcc, i);
 	}

 	cfg->irq_config_func(dev);

 	return 0;
 }

 static const struct ipm_driver_api stm32_ipcc_mailbox_driver_api = {
 	.send = stm32_ipcc_mailbox_ipm_send,
 	.register_callback = stm32_ipcc_mailbox_ipm_register_callback,
 	.max_data_size_get = stm32_ipcc_mailbox_ipm_max_data_size_get,
 	.max_id_val_get = stm32_ipcc_mailbox_ipm_max_id_val_get,
 	.set_enabled = stm32_ipcc_mailbox_ipm_set_enabled,
 };

 static void stm32_ipcc_mailbox_config_func(const struct device *dev);

 /* Config MAILBOX 0 */
 static const struct stm32_ipcc_mailbox_config stm32_ipcc_mailbox_0_config = {
 	.irq_config_func = stm32_ipcc_mailbox_config_func,
 	.ipcc = (IPCC_TypeDef *)DT_INST_REG_ADDR(0),
 	.pclken = { .bus = DT_INST_CLOCKS_CELL(0, bus),
 		    .enr = DT_INST_CLOCKS_CELL(0, bits)
 	},

 };

 DEVICE_DT_INST_DEFINE(0,
 		    &stm32_ipcc_mailbox_init,
 		    NULL,
 		    &stm32_IPCC_data, &stm32_ipcc_mailbox_0_config,
 		    POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
 		    &stm32_ipcc_mailbox_driver_api);

 static void stm32_ipcc_mailbox_config_func(const struct device *dev)
 {
 	IRQ_CONNECT(DT_INST_IRQ_BY_NAME(0, rxo, irq),
 		    DT_INST_IRQ_BY_NAME(0, rxo, priority),
 		    stm32_ipcc_mailbox_rx_isr, DEVICE_DT_INST_GET(0), 0);

 	IRQ_CONNECT(DT_INST_IRQ_BY_NAME(0, txf, irq),
 		    DT_INST_IRQ_BY_NAME(0, txf, priority),
 		    stm32_ipcc_mailbox_tx_isr, DEVICE_DT_INST_GET(0), 0);

 	irq_enable(DT_INST_IRQ_BY_NAME(0, rxo, irq));
 	irq_enable(DT_INST_IRQ_BY_NAME(0, txf, irq));
 }
	/*
	* Copyright (c) 2019 ST Microelectronics Limited
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT st_stm32_ipcc_mailbox

	#include <zephyr/drivers/clock_control.h>
	#include <zephyr/device.h>
	#include <errno.h>
	#include <zephyr/drivers/ipm.h>
	#include <soc.h>
	#include <stm32_ll_ipcc.h>

	#include <zephyr/drivers/clock_control/stm32_clock_control.h>

	#include <zephyr/logging/log.h>
	#include <zephyr/irq.h>
	LOG_MODULE_REGISTER(ipm_stm32_ipcc, CONFIG_IPM_LOG_LEVEL);

	#define MBX_STRUCT(dev) \
	((IPCC_TypeDef *) \
	((const struct stm32_ipcc_mailbox_config * const)(dev)->config)->uconf.base)

	#define IPCC_ALL_MR_TXF_CH_MASK 0xFFFF0000
	#define IPCC_ALL_MR_RXO_CH_MASK 0x0000FFFF
	#define IPCC_ALL_SR_CH_MASK 0x0000FFFF

	#if (CONFIG_IPM_STM32_IPCC_PROCID == 1)

	#define IPCC_EnableIT_TXF(hipcc) LL_C1_IPCC_EnableIT_TXF(hipcc)
	#define IPCC_DisableIT_TXF(hipcc) LL_C1_IPCC_DisableIT_TXF(hipcc)

	#define IPCC_EnableIT_RXO(hipcc) LL_C1_IPCC_EnableIT_RXO(hipcc)
	#define IPCC_DisableIT_RXO(hipcc) LL_C1_IPCC_DisableIT_RXO(hipcc)

	#define IPCC_EnableReceiveChannel(hipcc, ch) \
	LL_C1_IPCC_EnableReceiveChannel(hipcc, 1 << ch)
	#define IPCC_EnableTransmitChannel(hipcc, ch) \
	LL_C1_IPCC_EnableTransmitChannel(hipcc, 1 << ch)
	#define IPCC_DisableReceiveChannel(hipcc, ch) \
	LL_C2_IPCC_DisableReceiveChannel(hipcc, 1 << ch)
	#define IPCC_DisableTransmitChannel(hipcc, ch) \
	LL_C1_IPCC_DisableTransmitChannel(hipcc, 1 << ch)

	#define IPCC_ClearFlag_CHx(hipcc, ch) LL_C1_IPCC_ClearFlag_CHx(hipcc, 1 << ch)
	#define IPCC_SetFlag_CHx(hipcc, ch) LL_C1_IPCC_SetFlag_CHx(hipcc, 1 << ch)

	#define IPCC_IsActiveFlag_CHx(hipcc, ch) \
	LL_C1_IPCC_IsActiveFlag_CHx(hipcc, 1 << ch)

	#define IPCC_ReadReg(hipcc, reg) READ_REG(hipcc->C1##reg)

	#define IPCC_ReadReg_SR(hipcc) READ_REG(hipcc->C1TOC2SR)
	#define IPCC_ReadOtherInstReg_SR(hipcc) READ_REG(hipcc->C2TOC1SR)

	#else

	#define IPCC_EnableIT_TXF(hipcc) LL_C2_IPCC_EnableIT_TXF(hipcc)
	#define IPCC_DisableIT_TXF(hipcc) LL_C2_IPCC_DisableIT_TXF(hipcc)

	#define IPCC_EnableIT_RXO(hipcc) LL_C2_IPCC_EnableIT_RXO(hipcc)
	#define IPCC_DisableIT_RXO(hipcc) LL_C2_IPCC_DisableIT_RXO(hipcc)

	#define IPCC_EnableReceiveChannel(hipcc, ch) \
	LL_C2_IPCC_EnableReceiveChannel(hipcc, 1 << ch)
	#define IPCC_EnableTransmitChannel(hipcc, ch) \
	LL_C2_IPCC_EnableTransmitChannel(hipcc, 1 << ch)
	#define IPCC_DisableReceiveChannel(hipcc, ch) \
	LL_C2_IPCC_DisableReceiveChannel(hipcc, 1 << ch)
	#define IPCC_DisableTransmitChannel(hipcc, ch) \
	LL_C2_IPCC_DisableTransmitChannel(hipcc, 1 << ch)

	#define IPCC_ClearFlag_CHx(hipcc, ch) LL_C2_IPCC_ClearFlag_CHx(hipcc, 1 << ch)
	#define IPCC_SetFlag_CHx(hipcc, ch) LL_C2_IPCC_SetFlag_CHx(hipcc, 1 << ch)

	#define IPCC_IsActiveFlag_CHx(hipcc, ch) \
	LL_C2_IPCC_IsActiveFlag_CHx(hipcc, 1 << ch)

	#define IPCC_ReadReg(hipcc, reg) READ_REG(hipcc->C2##reg)

	#define IPCC_ReadReg_SR(hipcc) READ_REG(hipcc->C2TOC1SR)
	#define IPCC_ReadOtherInstReg_SR(hipcc) READ_REG(hipcc->C1TOC2SR)

	#endif

	struct stm32_ipcc_mailbox_config {
	void (irq_config_func)(const struct device dev);
	IPCC_TypeDef *ipcc;
	struct stm32_pclken pclken;
	};

	struct stm32_ipcc_mbx_data {
	uint32_t num_ch;
	ipm_callback_t callback;
	void *user_data;
	};

	static struct stm32_ipcc_mbx_data stm32_IPCC_data;

	static void stm32_ipcc_mailbox_rx_isr(const struct device *dev)
	{
	struct stm32_ipcc_mbx_data *data = dev->data;
	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
	unsigned int value = 0;
	uint32_t mask, i;

	mask = (~IPCC_ReadReg(cfg->ipcc, MR)) & IPCC_ALL_MR_RXO_CH_MASK;
	mask &= IPCC_ReadOtherInstReg_SR(cfg->ipcc) & IPCC_ALL_SR_CH_MASK;

	for (i = 0; i < data->num_ch; i++) {
	if (!((1 << i) & mask)) {
	continue;
	}
	LOG_DBG("%s channel = %x\r\n", __func__, i);
	/* mask the channel Free interrupt */
	IPCC_DisableReceiveChannel(cfg->ipcc, i);

	if (data->callback) {
	/* Only one MAILBOX, id is unused and set to 0 */
	data->callback(dev, data->user_data, i, &value);
	}
	/* clear status to acknowledge message reception */
	IPCC_ClearFlag_CHx(cfg->ipcc, i);
	IPCC_EnableReceiveChannel(cfg->ipcc, i);
	}
	}

	static void stm32_ipcc_mailbox_tx_isr(const struct device *dev)
	{
	struct stm32_ipcc_mbx_data *data = dev->data;
	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
	uint32_t mask, i;

	mask = (~IPCC_ReadReg(cfg->ipcc, MR)) & IPCC_ALL_MR_TXF_CH_MASK;
	mask = mask >> IPCC_C1MR_CH1FM_Pos;

	mask &= ~IPCC_ReadReg_SR(cfg->ipcc) & IPCC_ALL_SR_CH_MASK;

	for (i = 0; i < data->num_ch; i++) {
	if (!((1 << i) & mask)) {
	continue;
	}
	LOG_DBG("%s channel = %x\r\n", __func__, i);
	/* mask the channel Free interrupt */
	IPCC_DisableTransmitChannel(cfg->ipcc, i);
	}
	}

	static int stm32_ipcc_mailbox_ipm_send(const struct device *dev, int wait,
	uint32_t id,
	const void *buff, int size)
	{
	struct stm32_ipcc_mbx_data *data = dev->data;
	const struct stm32_ipcc_mailbox_config *cfg = dev->config;

	ARG_UNUSED(wait);
	ARG_UNUSED(buff);

	/* No data transmission, only doorbell */
	if (size) {
	return -EMSGSIZE;
	}

	if (id >= data->num_ch) {
	LOG_ERR("invalid id (%d)\r\n", id);
	return -EINVAL;
	}

	LOG_DBG("Send msg on channel %d\r\n", id);

	/* Check that the channel is free (otherwise wait) */
	if (IPCC_IsActiveFlag_CHx(cfg->ipcc, id)) {
	LOG_DBG("Waiting for channel to be freed\r\n");
	while (IPCC_IsActiveFlag_CHx(cfg->ipcc, id)) {
	;
	}
	}
	IPCC_EnableTransmitChannel(cfg->ipcc, id);
	IPCC_SetFlag_CHx(cfg->ipcc, id);

	return 0;
	}

	static int stm32_ipcc_mailbox_ipm_max_data_size_get(const struct device *dev)
	{
	ARG_UNUSED(dev);

	/* no data transfer capability */
	return 0;
	}

	static uint32_t stm32_ipcc_mailbox_ipm_max_id_val_get(const struct device *d)
	{
	struct stm32_ipcc_mbx_data *data = d->data;

	return data->num_ch - 1;
	}

	static void stm32_ipcc_mailbox_ipm_register_callback(const struct device *d,
	ipm_callback_t cb,
	void *user_data)
	{
	struct stm32_ipcc_mbx_data *data = d->data;

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

	static int stm32_ipcc_mailbox_ipm_set_enabled(const struct device *dev,
	int enable)
	{
	struct stm32_ipcc_mbx_data *data = dev->data;
	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
	uint32_t i;

	/* For now: nothing to be done */
	LOG_DBG("%s %s mailbox\r\n", __func__, enable ? "enable" : "disable");
	if (enable) {
	/* Enable RX and TX interrupts */
	IPCC_EnableIT_TXF(cfg->ipcc);
	IPCC_EnableIT_RXO(cfg->ipcc);
	for (i = 0; i < data->num_ch; i++) {
	IPCC_EnableReceiveChannel(cfg->ipcc, i);
	}
	} else {
	/* Disable RX and TX interrupts */
	IPCC_DisableIT_TXF(cfg->ipcc);
	IPCC_DisableIT_RXO(cfg->ipcc);
	for (i = 0; i < data->num_ch; i++) {
	IPCC_DisableReceiveChannel(cfg->ipcc, i);
	}
	}

	return 0;
	}

	static int stm32_ipcc_mailbox_init(const struct device *dev)
	{

	struct stm32_ipcc_mbx_data *data = dev->data;
	const struct stm32_ipcc_mailbox_config *cfg = dev->config;
	const struct device *clk;
	uint32_t i;

	clk = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);

	if (!device_is_ready(clk)) {
	LOG_ERR("clock control device not ready");
	return -ENODEV;
	}

	/* enable clock */
	if (clock_control_on(clk,
	(clock_control_subsys_t)&cfg->pclken) != 0) {
	return -EIO;
	}

	/* Disable RX and TX interrupts */
	IPCC_DisableIT_TXF(cfg->ipcc);
	IPCC_DisableIT_RXO(cfg->ipcc);

	data->num_ch = LL_IPCC_GetChannelConfig(cfg->ipcc);

	for (i = 0; i < data->num_ch; i++) {
	/* Clear RX status */
	IPCC_ClearFlag_CHx(cfg->ipcc, i);
	/* mask RX and TX interrupts */
	IPCC_DisableReceiveChannel(cfg->ipcc, i);
	IPCC_DisableTransmitChannel(cfg->ipcc, i);
	}

	cfg->irq_config_func(dev);

	return 0;
	}

	static const struct ipm_driver_api stm32_ipcc_mailbox_driver_api = {
	.send = stm32_ipcc_mailbox_ipm_send,
	.register_callback = stm32_ipcc_mailbox_ipm_register_callback,
	.max_data_size_get = stm32_ipcc_mailbox_ipm_max_data_size_get,
	.max_id_val_get = stm32_ipcc_mailbox_ipm_max_id_val_get,
	.set_enabled = stm32_ipcc_mailbox_ipm_set_enabled,
	};

	static void stm32_ipcc_mailbox_config_func(const struct device *dev);

	/* Config MAILBOX 0 */
	static const struct stm32_ipcc_mailbox_config stm32_ipcc_mailbox_0_config = {
	.irq_config_func = stm32_ipcc_mailbox_config_func,
	.ipcc = (IPCC_TypeDef *)DT_INST_REG_ADDR(0),
	.pclken = { .bus = DT_INST_CLOCKS_CELL(0, bus),
	.enr = DT_INST_CLOCKS_CELL(0, bits)
	},

	};

	DEVICE_DT_INST_DEFINE(0,
	&stm32_ipcc_mailbox_init,
	NULL,
	&stm32_IPCC_data, &stm32_ipcc_mailbox_0_config,
	POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,
	&stm32_ipcc_mailbox_driver_api);

	static void stm32_ipcc_mailbox_config_func(const struct device *dev)
	{
	IRQ_CONNECT(DT_INST_IRQ_BY_NAME(0, rxo, irq),
	DT_INST_IRQ_BY_NAME(0, rxo, priority),
	stm32_ipcc_mailbox_rx_isr, DEVICE_DT_INST_GET(0), 0);

	IRQ_CONNECT(DT_INST_IRQ_BY_NAME(0, txf, irq),
	DT_INST_IRQ_BY_NAME(0, txf, priority),
	stm32_ipcc_mailbox_tx_isr, DEVICE_DT_INST_GET(0), 0);

	irq_enable(DT_INST_IRQ_BY_NAME(0, rxo, irq));
	irq_enable(DT_INST_IRQ_BY_NAME(0, txf, irq));
	}