/*
 * Copyright (c) 2017 Erwin Rol <erwin@erwinrol.com>
 * Copyright (c) 2020 Alexander Kozhinov <AlexanderKozhinov@yandex.com>
 * Copyright (c) 2021 Carbon Robotics
 * SPDX-License-Identifier: Apache-2.0
 */

#define DT_DRV_COMPAT st_stm32_ethernet

#define LOG_MODULE_NAME eth_stm32_hal
#define LOG_LEVEL CONFIG_ETHERNET_LOG_LEVEL

#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(LOG_MODULE_NAME);

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/sys/util.h>
#include <errno.h>
#include <stdbool.h>
#include <zephyr/net/net_pkt.h>
#include <zephyr/net/net_if.h>
#include <zephyr/net/ethernet.h>
#include <ethernet/eth_stats.h>
#include <soc.h>
#include <zephyr/sys/printk.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/clock_control/stm32_clock_control.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/irq.h>
#include <zephyr/net/lldp.h>

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
#include <zephyr/drivers/ptp_clock.h>
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

#include "eth.h"
#include "eth_stm32_hal_priv.h"

#if defined(CONFIG_ETH_STM32_HAL_USE_DTCM_FOR_DMA_BUFFER) && \
	    !DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay)
#error DTCM for DMA buffer is activated but zephyr,dtcm is not present in dts
#endif

#define PHY_ADDR	CONFIG_ETH_STM32_HAL_PHY_ADDRESS

#if defined(CONFIG_SOC_SERIES_STM32H7X)

#define PHY_BSR  ((uint16_t)0x0001U)  /*!< Transceiver Basic Status Register */
#define PHY_LINKED_STATUS  ((uint16_t)0x0004U)  /*!< Valid link established */

#define IS_ETH_DMATXDESC_OWN(dma_tx_desc)	(dma_tx_desc->DESC3 & \
							ETH_DMATXNDESCRF_OWN)

#define ETH_RXBUFNB	ETH_RX_DESC_CNT
#define ETH_TXBUFNB	ETH_TX_DESC_CNT

#define ETH_MEDIA_INTERFACE_MII		HAL_ETH_MII_MODE
#define ETH_MEDIA_INTERFACE_RMII	HAL_ETH_RMII_MODE

/* Only one tx_buffer is sufficient to pass only 1 dma_buffer */
#define ETH_TXBUF_DEF_NB	1U
#else

#define IS_ETH_DMATXDESC_OWN(dma_tx_desc)	(dma_tx_desc->Status & \
							ETH_DMATXDESC_OWN)

#endif /* CONFIG_SOC_SERIES_STM32H7X */

#define ETH_DMA_TX_TIMEOUT_MS	20U  /* transmit timeout in milliseconds */

#if defined(CONFIG_ETH_STM32_HAL_USE_DTCM_FOR_DMA_BUFFER) && \
	    DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay)
#define __eth_stm32_desc __dtcm_noinit_section
#define __eth_stm32_buf  __dtcm_noinit_section
#elif defined(CONFIG_SOC_SERIES_STM32H7X) && \
		DT_NODE_HAS_STATUS(DT_NODELABEL(sram3), okay)
#define __eth_stm32_desc __attribute__((section(".eth_stm32_desc")))
#define __eth_stm32_buf  __attribute__((section(".eth_stm32_buf")))
#elif defined(CONFIG_NOCACHE_MEMORY)
#define __eth_stm32_desc __nocache __aligned(4)
#define __eth_stm32_buf  __nocache __aligned(4)
#else
#define __eth_stm32_desc __aligned(4)
#define __eth_stm32_buf  __aligned(4)
#endif

static ETH_DMADescTypeDef dma_rx_desc_tab[ETH_RXBUFNB] __eth_stm32_desc;
static ETH_DMADescTypeDef dma_tx_desc_tab[ETH_TXBUFNB] __eth_stm32_desc;
static uint8_t dma_rx_buffer[ETH_RXBUFNB][ETH_STM32_RX_BUF_SIZE] __eth_stm32_buf;
static uint8_t dma_tx_buffer[ETH_TXBUFNB][ETH_STM32_TX_BUF_SIZE] __eth_stm32_buf;

#if defined(CONFIG_ETH_STM32_HAL_API_V2)

BUILD_ASSERT(ETH_STM32_RX_BUF_SIZE % 4 == 0, "Rx buffer size must be a multiple of 4");

struct eth_stm32_rx_buffer_header {
	struct eth_stm32_rx_buffer_header *next;
	uint16_t size;
	bool used;
};

struct eth_stm32_tx_buffer_header {
	ETH_BufferTypeDef tx_buff;
	bool used;
};

struct eth_stm32_tx_context {
	struct net_pkt *pkt;
	uint16_t first_tx_buffer_index;
};

static struct eth_stm32_rx_buffer_header dma_rx_buffer_header[ETH_RXBUFNB];
static struct eth_stm32_tx_buffer_header dma_tx_buffer_header[ETH_TXBUFNB];

void HAL_ETH_RxAllocateCallback(uint8_t **buf)
{
	for (size_t i = 0; i < ETH_RXBUFNB; ++i) {
		if (!dma_rx_buffer_header[i].used) {
			dma_rx_buffer_header[i].next = NULL;
			dma_rx_buffer_header[i].size = 0;
			dma_rx_buffer_header[i].used = true;
			*buf = dma_rx_buffer[i];
			return;
		}
	}
	*buf = NULL;
}

/* Pointer to an array of ETH_STM32_RX_BUF_SIZE uint8_t's */
typedef uint8_t (*RxBufferPtr)[ETH_STM32_RX_BUF_SIZE];

/* called by HAL_ETH_ReadData() */
void HAL_ETH_RxLinkCallback(void **pStart, void **pEnd, uint8_t *buff, uint16_t Length)
{
	/* buff points to the begin on one of the rx buffers,
	 * so we can compute the index of the given buffer
	 */
	size_t index = (RxBufferPtr)buff - &dma_rx_buffer[0];
	struct eth_stm32_rx_buffer_header *header = &dma_rx_buffer_header[index];

	__ASSERT_NO_MSG(index < ETH_RXBUFNB);

	header->size = Length;

	if (!*pStart) {
		/* first packet, set head pointer of linked list */
		*pStart = header;
		*pEnd = header;
	} else {
		__ASSERT_NO_MSG(*pEnd != NULL);
		/* not the first packet, add to list and adjust tail pointer */
		((struct eth_stm32_rx_buffer_header *)*pEnd)->next = header;
		*pEnd = header;
	}
}

/* Called by HAL_ETH_ReleaseTxPacket */
void HAL_ETH_TxFreeCallback(uint32_t *buff)
{
	__ASSERT_NO_MSG(buff != NULL);

	/* buff is the user context in tx_config.pData */
	struct eth_stm32_tx_context *ctx = (struct eth_stm32_tx_context *)buff;
	struct eth_stm32_tx_buffer_header *buffer_header =
		&dma_tx_buffer_header[ctx->first_tx_buffer_index];

	while (buffer_header != NULL) {
		buffer_header->used = false;
		if (buffer_header->tx_buff.next != NULL) {
			buffer_header = CONTAINER_OF(buffer_header->tx_buff.next,
				struct eth_stm32_tx_buffer_header, tx_buff);
		} else {
			buffer_header = NULL;
		}
	}
}

/* allocate a tx buffer and mark it as used */
static inline uint16_t allocate_tx_buffer(void)
{
	for (;;) {
		for (uint16_t index = 0; index < ETH_TXBUFNB; index++) {
			if (!dma_tx_buffer_header[index].used) {
				dma_tx_buffer_header[index].used = true;
				return index;
			}
		}
		k_yield();
	}
}
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
static ETH_TxPacketConfig tx_config;
#endif

static HAL_StatusTypeDef read_eth_phy_register(ETH_HandleTypeDef *heth,
						uint32_t PHYAddr,
						uint32_t PHYReg,
						uint32_t *RegVal)
{
#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
	return HAL_ETH_ReadPHYRegister(heth, PHYAddr, PHYReg, RegVal);
#else
	ARG_UNUSED(PHYAddr);
	return HAL_ETH_ReadPHYRegister(heth, PHYReg, RegVal);
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */
}

static inline void disable_mcast_filter(ETH_HandleTypeDef *heth)
{
	__ASSERT_NO_MSG(heth != NULL);

#if defined(CONFIG_SOC_SERIES_STM32H7X)
	ETH_MACFilterConfigTypeDef MACFilterConf;

	HAL_ETH_GetMACFilterConfig(heth, &MACFilterConf);
	MACFilterConf.HashMulticast = DISABLE;
	MACFilterConf.PassAllMulticast = ENABLE;
	MACFilterConf.HachOrPerfectFilter = DISABLE;

	HAL_ETH_SetMACFilterConfig(heth, &MACFilterConf);

	k_sleep(K_MSEC(1));
#else
	uint32_t tmp = heth->Instance->MACFFR;

	/* disable multicast filtering */
	tmp &= ~(ETH_MULTICASTFRAMESFILTER_PERFECTHASHTABLE |
		 ETH_MULTICASTFRAMESFILTER_HASHTABLE |
		 ETH_MULTICASTFRAMESFILTER_PERFECT);

	/* enable receiving all multicast frames */
	tmp |= ETH_MULTICASTFRAMESFILTER_NONE;

	heth->Instance->MACFFR = tmp;

	/* Wait until the write operation will be taken into account:
	 * at least four TX_CLK/RX_CLK clock cycles
	 */
	tmp = heth->Instance->MACFFR;
	k_sleep(K_MSEC(1));
	heth->Instance->MACFFR = tmp;
#endif /* CONFIG_SOC_SERIES_STM32H7X) */
}

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
static bool eth_is_ptp_pkt(struct net_if *iface, struct net_pkt *pkt)
{
#if defined(CONFIG_NET_VLAN)
	struct net_eth_vlan_hdr *hdr_vlan;
	struct ethernet_context *eth_ctx;

	eth_ctx = net_if_l2_data(iface);
	if (net_eth_is_vlan_enabled(eth_ctx, iface)) {
		hdr_vlan = (struct net_eth_vlan_hdr *)NET_ETH_HDR(pkt);

		if (ntohs(hdr_vlan->type) != NET_ETH_PTYPE_PTP) {
			return false;
		}
	} else
#endif
	{
		if (ntohs(NET_ETH_HDR(pkt)->type) != NET_ETH_PTYPE_PTP) {
			return false;
		}
	}

	net_pkt_set_priority(pkt, NET_PRIORITY_CA);

	return true;
}
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
void HAL_ETH_TxPtpCallback(uint32_t *buff, ETH_TimeStampTypeDef *timestamp)
{
	struct eth_stm32_tx_context *ctx = (struct eth_stm32_tx_context *)buff;

	ctx->pkt->timestamp.second = timestamp->TimeStampHigh;
	ctx->pkt->timestamp.nanosecond = timestamp->TimeStampLow;

	net_if_add_tx_timestamp(ctx->pkt);
}
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

static int eth_tx(const struct device *dev, struct net_pkt *pkt)
{
	struct eth_stm32_hal_dev_data *dev_data = dev->data;
	ETH_HandleTypeDef *heth;
	int res;
	size_t total_len;
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	size_t remaining_read;
	struct eth_stm32_tx_context ctx = {.pkt = pkt, .first_tx_buffer_index = 0};
	struct eth_stm32_tx_buffer_header *buf_header = NULL;
#else
	uint8_t *dma_buffer;
	__IO ETH_DMADescTypeDef *dma_tx_desc;
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */
	HAL_StatusTypeDef hal_ret = HAL_OK;
#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
	bool timestamped_frame;
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

	__ASSERT_NO_MSG(pkt != NULL);
	__ASSERT_NO_MSG(pkt->frags != NULL);
	__ASSERT_NO_MSG(dev != NULL);
	__ASSERT_NO_MSG(dev_data != NULL);

	heth = &dev_data->heth;

	total_len = net_pkt_get_len(pkt);
	if (total_len > (ETH_STM32_TX_BUF_SIZE * ETH_TXBUFNB)) {
		LOG_ERR("PKT too big");
		return -EIO;
	}

	k_mutex_lock(&dev_data->tx_mutex, K_FOREVER);

#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	ctx.first_tx_buffer_index = allocate_tx_buffer();
	buf_header = &dma_tx_buffer_header[ctx.first_tx_buffer_index];
#else /* CONFIG_ETH_STM32_HAL_API_V2 */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	uint32_t cur_tx_desc_idx;

	cur_tx_desc_idx = heth->TxDescList.CurTxDesc;
	dma_tx_desc = (ETH_DMADescTypeDef *)heth->TxDescList.TxDesc[cur_tx_desc_idx];
#else
	dma_tx_desc = heth->TxDesc;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	while (IS_ETH_DMATXDESC_OWN(dma_tx_desc) != (uint32_t)RESET) {
		k_yield();
	}
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
	timestamped_frame = eth_is_ptp_pkt(net_pkt_iface(pkt), pkt);
	if (timestamped_frame) {
		/* Enable transmit timestamp */
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
		HAL_ETH_PTP_InsertTxTimestamp(heth);
#elif defined(CONFIG_SOC_SERIES_STM32H7X)
		dma_tx_desc->DESC2 |= ETH_DMATXNDESCRF_TTSE;
#else
		dma_tx_desc->Status |= ETH_DMATXDESC_TTSE;
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */
	}
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	remaining_read = total_len;
	/* fill and allocate buffer until remaining data fits in one buffer */
	while (remaining_read > ETH_STM32_TX_BUF_SIZE) {
		if (net_pkt_read(pkt, buf_header->tx_buff.buffer, ETH_STM32_TX_BUF_SIZE)) {
			res = -ENOBUFS;
			goto error;
		}
		const uint16_t next_buffer_id = allocate_tx_buffer();

		buf_header->tx_buff.len = ETH_STM32_TX_BUF_SIZE;
		/* append new buffer to the linked list */
		buf_header->tx_buff.next = &dma_tx_buffer_header[next_buffer_id].tx_buff;
		/* and adjust tail pointer */
		buf_header = &dma_tx_buffer_header[next_buffer_id];
		remaining_read -= ETH_STM32_TX_BUF_SIZE;
	}
	if (net_pkt_read(pkt, buf_header->tx_buff.buffer, remaining_read)) {
		res = -ENOBUFS;
		goto error;
	}
	buf_header->tx_buff.len = remaining_read;
	buf_header->tx_buff.next = NULL;

#else /* CONFIG_ETH_STM32_HAL_API_V2 */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	dma_buffer = dma_tx_buffer[cur_tx_desc_idx];
#else
	dma_buffer = (uint8_t *)(dma_tx_desc->Buffer1Addr);
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	if (net_pkt_read(pkt, dma_buffer, total_len)) {
		res = -ENOBUFS;
		goto error;
	}

#if defined(CONFIG_SOC_SERIES_STM32H7X)
	ETH_BufferTypeDef tx_buffer_def;

	tx_buffer_def.buffer = dma_buffer;
	tx_buffer_def.len = total_len;
	tx_buffer_def.next = NULL;
#endif /* CONFIG_SOC_SERIES_STM32H7X */
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)

	tx_config.Length = total_len;
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	tx_config.pData = &ctx;
	tx_config.TxBuffer = &dma_tx_buffer_header[ctx.first_tx_buffer_index].tx_buff;
#else
	tx_config.TxBuffer = &tx_buffer_def;
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

	/* Reset TX complete interrupt semaphore before TX request*/
	k_sem_reset(&dev_data->tx_int_sem);

	/* tx_buffer is allocated on function stack, we need */
	/* to wait for the transfer to complete */
	/* So it is not freed before the interrupt happens */
	hal_ret = HAL_ETH_Transmit_IT(heth, &tx_config);

	if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_Transmit: failed!");
		res = -EIO;
		goto error;
	}

	/* Wait for end of TX buffer transmission */
	/* If the semaphore timeout breaks, it means */
	/* an error occurred or IT was not fired */
	if (k_sem_take(&dev_data->tx_int_sem,
			K_MSEC(ETH_DMA_TX_TIMEOUT_MS)) != 0) {

		LOG_ERR("HAL_ETH_TransmitIT tx_int_sem take timeout");
		res = -EIO;

#ifndef CONFIG_ETH_STM32_HAL_API_V2
		/* Content of the packet could be the reason for timeout */
		LOG_HEXDUMP_ERR(dma_buffer, total_len, "eth packet timeout");
#endif

		/* Check for errors */
		/* Ethernet device was put in error state */
		/* Error state is unrecoverable ? */
		if (HAL_ETH_GetState(heth) == HAL_ETH_STATE_ERROR) {
			LOG_ERR("%s: ETH in error state: errorcode:%x",
				__func__,
				HAL_ETH_GetError(heth));
			/* TODO recover from error state by restarting eth */
		}

		/* Check for DMA errors */
		if (HAL_ETH_GetDMAError(heth)) {
			LOG_ERR("%s: ETH DMA error: dmaerror:%x",
				__func__,
				HAL_ETH_GetDMAError(heth));
			/* DMA fatal bus errors are putting in error state*/
			/* TODO recover from this */
		}

		/* Check for MAC errors */
		if (HAL_ETH_GetDMAError(heth)) {
			LOG_ERR("%s: ETH DMA error: macerror:%x",
				__func__,
				HAL_ETH_GetDMAError(heth));
			/* MAC errors are putting in error state*/
			/* TODO recover from this */
		}

		goto error;
	}

#else
	hal_ret = HAL_ETH_TransmitFrame(heth, total_len);

	if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_Transmit: failed!");
		res = -EIO;
		goto error;
	}

	/* When Transmit Underflow flag is set, clear it and issue a
	 * Transmit Poll Demand to resume transmission.
	 */
	if ((heth->Instance->DMASR & ETH_DMASR_TUS) != (uint32_t)RESET) {
		/* Clear TUS ETHERNET DMA flag */
		heth->Instance->DMASR = ETH_DMASR_TUS;
		/* Resume DMA transmission*/
		heth->Instance->DMATPDR = 0;
		res = -EIO;
		goto error;
	}
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */

#if defined(CONFIG_PTP_CLOCK_STM32_HAL) && !defined(CONFIG_ETH_STM32_HAL_API_V2)
	if (timestamped_frame) {
		/* Retrieve transmission timestamp from last DMA TX descriptor */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
		ETH_TxDescListTypeDef * dma_tx_desc_list;

		__IO ETH_DMADescTypeDef *last_dma_tx_desc;

		dma_tx_desc_list = &heth->TxDescList;
		for (uint32_t i = 0; i < ETH_TX_DESC_CNT; i++) {
			const uint32_t last_desc_idx = (cur_tx_desc_idx + i) % ETH_TX_DESC_CNT;

			last_dma_tx_desc =
				(ETH_DMADescTypeDef *)dma_tx_desc_list->TxDesc[last_desc_idx];
			if (last_dma_tx_desc->DESC3 & ETH_DMATXNDESCWBF_LD) {
				break;
			}
		}

		while (IS_ETH_DMATXDESC_OWN(last_dma_tx_desc) != (uint32_t)RESET) {
			/* Wait for transmission */
			k_yield();
		}

		if ((last_dma_tx_desc->DESC3 & ETH_DMATXNDESCWBF_LD) &&
				(last_dma_tx_desc->DESC3 & ETH_DMATXNDESCWBF_TTSS)) {
			pkt->timestamp.second = last_dma_tx_desc->DESC1;
			pkt->timestamp.nanosecond = last_dma_tx_desc->DESC0;
		} else {
			/* Invalid value */
			pkt->timestamp.second = UINT64_MAX;
			pkt->timestamp.nanosecond = UINT32_MAX;
		}
#else
		__IO ETH_DMADescTypeDef *last_dma_tx_desc = dma_tx_desc;

		while (!(last_dma_tx_desc->Status & ETH_DMATXDESC_LS) &&
				last_dma_tx_desc->Buffer2NextDescAddr) {
			last_dma_tx_desc =
				(ETH_DMADescTypeDef *)last_dma_tx_desc->Buffer2NextDescAddr;
		}

		while (IS_ETH_DMATXDESC_OWN(last_dma_tx_desc) != (uint32_t)RESET) {
			/* Wait for transmission */
			k_yield();
		}

		if (last_dma_tx_desc->Status & ETH_DMATXDESC_LS &&
				last_dma_tx_desc->Status & ETH_DMATXDESC_TTSS) {
			pkt->timestamp.second = last_dma_tx_desc->TimeStampHigh;
			pkt->timestamp.nanosecond = last_dma_tx_desc->TimeStampLow;
		} else {
			/* Invalid value */
			pkt->timestamp.second = UINT64_MAX;
			pkt->timestamp.nanosecond = UINT32_MAX;
		}
#endif /* CONFIG_SOC_SERIES_STM32H7X */

		net_if_add_tx_timestamp(pkt);
	}
#endif /* CONFIG_PTP_CLOCK_STM32_HAL && !CONFIG_ETH_STM32_HAL_API_V2 */

	res = 0;
error:

#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	/* free package tx buffer */
	if (res != 0) {
		HAL_ETH_TxFreeCallback((uint32_t *)&ctx);
	} else if (HAL_ETH_ReleaseTxPacket(heth) != HAL_OK) {
		LOG_ERR("HAL_ETH_ReleaseTxPacket failed");
		res = -EIO;
	}
#endif

	k_mutex_unlock(&dev_data->tx_mutex);

	return res;
}

static struct net_if *get_iface(struct eth_stm32_hal_dev_data *ctx,
				uint16_t vlan_tag)
{
#if defined(CONFIG_NET_VLAN)
	struct net_if *iface;

	iface = net_eth_get_vlan_iface(ctx->iface, vlan_tag);
	if (!iface) {
		return ctx->iface;
	}

	return iface;
#else
	ARG_UNUSED(vlan_tag);

	return ctx->iface;
#endif
}

static struct net_pkt *eth_rx(const struct device *dev, uint16_t *vlan_tag)
{
	struct eth_stm32_hal_dev_data *dev_data;
	ETH_HandleTypeDef *heth;
	struct net_pkt *pkt;
	size_t total_len = 0;
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	void *appbuf = NULL;
	struct eth_stm32_rx_buffer_header *rx_header;
#else
#if !defined(CONFIG_SOC_SERIES_STM32H7X)
	__IO ETH_DMADescTypeDef *dma_rx_desc;
#endif /* !CONFIG_SOC_SERIES_STM32H7X */
	uint8_t *dma_buffer;
	HAL_StatusTypeDef hal_ret = HAL_OK;
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */
#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
	struct net_ptp_time timestamp;
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	ETH_TimeStampTypeDef ts_registers;
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */
	/* Default to invalid value. */
	timestamp.second = UINT64_MAX;
	timestamp.nanosecond = UINT32_MAX;
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

	__ASSERT_NO_MSG(dev != NULL);

	dev_data = dev->data;

	__ASSERT_NO_MSG(dev_data != NULL);

	heth = &dev_data->heth;

#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	if (HAL_ETH_ReadData(heth, &appbuf) != HAL_OK) {
		/* no frame available */
		return NULL;
	}

	/* computing total length */
	for (rx_header = (struct eth_stm32_rx_buffer_header *)appbuf;
			rx_header; rx_header = rx_header->next) {
		total_len += rx_header->size;
	}
#elif defined(CONFIG_SOC_SERIES_STM32H7X)
	if (HAL_ETH_IsRxDataAvailable(heth) != true) {
		/* no frame available */
		return NULL;
	}

	ETH_BufferTypeDef rx_buffer_def;
	uint32_t frame_length = 0;

	hal_ret = HAL_ETH_GetRxDataBuffer(heth, &rx_buffer_def);
	if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_GetRxDataBuffer: failed with state: %d",
			hal_ret);
		return NULL;
	}

	hal_ret = HAL_ETH_GetRxDataLength(heth, &frame_length);
	if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_GetRxDataLength: failed with state: %d",
			hal_ret);
		return NULL;
	}

	total_len = frame_length;
	dma_buffer = rx_buffer_def.buffer;
#else
	hal_ret = HAL_ETH_GetReceivedFrame_IT(heth);
	if (hal_ret != HAL_OK) {
		/* no frame available */
		return NULL;
	}

	total_len = heth->RxFrameInfos.length;
	dma_buffer = (uint8_t *)heth->RxFrameInfos.buffer;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
#if defined(CONFIG_ETH_STM32_HAL_API_V2)

	if (HAL_ETH_PTP_GetRxTimestamp(heth, &ts_registers) == HAL_OK) {
		timestamp.second = ts_registers.TimeStampHigh;
		timestamp.nanosecond = ts_registers.TimeStampLow;
	}

#elif defined(CONFIG_SOC_SERIES_STM32H7X)
	ETH_RxDescListTypeDef * dma_rx_desc_list;

	dma_rx_desc_list = &heth->RxDescList;
	if (dma_rx_desc_list->AppDescNbr) {
		__IO ETH_DMADescTypeDef *last_dma_rx_desc;

		const uint32_t last_desc_idx =
			(dma_rx_desc_list->FirstAppDesc + dma_rx_desc_list->AppDescNbr - 1U)
				% ETH_RX_DESC_CNT;

		last_dma_rx_desc =
			(ETH_DMADescTypeDef *)dma_rx_desc_list->RxDesc[last_desc_idx];

		if (dma_rx_desc_list->AppContextDesc &&
				last_dma_rx_desc->DESC1 & ETH_DMARXNDESCWBF_TSA) {
			/* Retrieve timestamp from context DMA descriptor */
			__IO ETH_DMADescTypeDef *context_dma_rx_desc;

			const uint32_t context_desc_idx = (last_desc_idx + 1U) % ETH_RX_DESC_CNT;

			context_dma_rx_desc =
				(ETH_DMADescTypeDef *)dma_rx_desc_list->RxDesc[context_desc_idx];
			if (context_dma_rx_desc->DESC1 != UINT32_MAX ||
					context_dma_rx_desc->DESC0 != UINT32_MAX) {
				timestamp.second = context_dma_rx_desc->DESC1;
				timestamp.nanosecond = context_dma_rx_desc->DESC0;
			}
		}
	}
#else
	__IO ETH_DMADescTypeDef *last_dma_rx_desc;

	last_dma_rx_desc = heth->RxFrameInfos.LSRxDesc;
	if (last_dma_rx_desc->TimeStampHigh != UINT32_MAX ||
			last_dma_rx_desc->TimeStampLow != UINT32_MAX) {
		timestamp.second = last_dma_rx_desc->TimeStampHigh;
		timestamp.nanosecond = last_dma_rx_desc->TimeStampLow;
	}
#endif /* CONFIG_SOC_SERIES_STM32H7X */
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

	pkt = net_pkt_rx_alloc_with_buffer(get_iface(dev_data, *vlan_tag),
					   total_len, AF_UNSPEC, 0, K_MSEC(100));
	if (!pkt) {
		LOG_ERR("Failed to obtain RX buffer");
		goto release_desc;
	}

#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	for (rx_header = (struct eth_stm32_rx_buffer_header *)appbuf;
			rx_header; rx_header = rx_header->next) {
		const size_t index = rx_header - &dma_rx_buffer_header[0];

		__ASSERT_NO_MSG(index < ETH_RXBUFNB);
		if (net_pkt_write(pkt, dma_rx_buffer[index], rx_header->size)) {
			LOG_ERR("Failed to append RX buffer to context buffer");
			net_pkt_unref(pkt);
			pkt = NULL;
			goto release_desc;
		}
	}
#else
	if (net_pkt_write(pkt, dma_buffer, total_len)) {
		LOG_ERR("Failed to append RX buffer to context buffer");
		net_pkt_unref(pkt);
		pkt = NULL;
		goto release_desc;
	}
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

release_desc:
#if defined(CONFIG_ETH_STM32_HAL_API_V2)
	for (rx_header = (struct eth_stm32_rx_buffer_header *)appbuf;
			rx_header; rx_header = rx_header->next) {
		rx_header->used = false;
	}

#elif defined(CONFIG_SOC_SERIES_STM32H7X)
	hal_ret = HAL_ETH_BuildRxDescriptors(heth);
	if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_BuildRxDescriptors: failed: %d", hal_ret);
	}
#else
	/* Release descriptors to DMA */
	/* Point to first descriptor */
	dma_rx_desc = heth->RxFrameInfos.FSRxDesc;
	/* Set Own bit in Rx descriptors: gives the buffers back to DMA */
	for (int i = 0; i < heth->RxFrameInfos.SegCount; i++) {
		dma_rx_desc->Status |= ETH_DMARXDESC_OWN;
		dma_rx_desc = (ETH_DMADescTypeDef *)
			(dma_rx_desc->Buffer2NextDescAddr);
	}

	/* Clear Segment_Count */
	heth->RxFrameInfos.SegCount = 0;

	/* When Rx Buffer unavailable flag is set: clear it
	 * and resume reception.
	 */
	if ((heth->Instance->DMASR & ETH_DMASR_RBUS) != (uint32_t)RESET) {
		/* Clear RBUS ETHERNET DMA flag */
		heth->Instance->DMASR = ETH_DMASR_RBUS;
		/* Resume DMA reception */
		heth->Instance->DMARPDR = 0;
	}
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

	if (!pkt) {
		goto out;
	}

#if defined(CONFIG_NET_VLAN)
	struct net_eth_hdr *hdr = NET_ETH_HDR(pkt);

	if (ntohs(hdr->type) == NET_ETH_PTYPE_VLAN) {
		struct net_eth_vlan_hdr *hdr_vlan =
			(struct net_eth_vlan_hdr *)NET_ETH_HDR(pkt);

		net_pkt_set_vlan_tci(pkt, ntohs(hdr_vlan->vlan.tci));
		*vlan_tag = net_pkt_vlan_tag(pkt);

#if CONFIG_NET_TC_RX_COUNT > 1
		enum net_priority prio;

		prio = net_vlan2priority(net_pkt_vlan_priority(pkt));
		net_pkt_set_priority(pkt, prio);
#endif
	} else {
		net_pkt_set_iface(pkt, dev_data->iface);
	}
#endif /* CONFIG_NET_VLAN */

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
	if (eth_is_ptp_pkt(get_iface(dev_data, *vlan_tag), pkt)) {
		pkt->timestamp.second = timestamp.second;
		pkt->timestamp.nanosecond = timestamp.nanosecond;
	} else {
		/* Invalid value */
		pkt->timestamp.second = UINT64_MAX;
		pkt->timestamp.nanosecond = UINT32_MAX;
	}
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

out:
	if (!pkt) {
		eth_stats_update_errors_rx(get_iface(dev_data, *vlan_tag));
	}

	return pkt;
}

static void rx_thread(void *arg1, void *unused1, void *unused2)
{
	uint16_t vlan_tag = NET_VLAN_TAG_UNSPEC;
	const struct device *dev;
	struct eth_stm32_hal_dev_data *dev_data;
	struct net_pkt *pkt;
	int res;
	uint32_t status;
	HAL_StatusTypeDef hal_ret = HAL_OK;

	__ASSERT_NO_MSG(arg1 != NULL);
	ARG_UNUSED(unused1);
	ARG_UNUSED(unused2);

	dev = (const struct device *)arg1;
	dev_data = dev->data;

	__ASSERT_NO_MSG(dev_data != NULL);

	while (1) {
		res = k_sem_take(&dev_data->rx_int_sem,
			K_MSEC(CONFIG_ETH_STM32_CARRIER_CHECK_RX_IDLE_TIMEOUT_MS));
		if (res == 0) {
			/* semaphore taken, update link status and receive packets */
			if (dev_data->link_up != true) {
				dev_data->link_up = true;
				net_eth_carrier_on(get_iface(dev_data,
							     vlan_tag));
			}
			while ((pkt = eth_rx(dev, &vlan_tag)) != NULL) {
				res = net_recv_data(net_pkt_iface(pkt), pkt);
				if (res < 0) {
					eth_stats_update_errors_rx(
							net_pkt_iface(pkt));
					LOG_ERR("Failed to enqueue frame "
						"into RX queue: %d", res);
					net_pkt_unref(pkt);
				}
			}
		} else if (res == -EAGAIN) {
			/* semaphore timeout period expired, check link status */
			hal_ret = read_eth_phy_register(&dev_data->heth,
				    PHY_ADDR, PHY_BSR, (uint32_t *) &status);
			if (hal_ret == HAL_OK) {
				if ((status & PHY_LINKED_STATUS) == PHY_LINKED_STATUS) {
					if (dev_data->link_up != true) {
						dev_data->link_up = true;
						net_eth_carrier_on(
							get_iface(dev_data,
								  vlan_tag));
					}
				} else {
					if (dev_data->link_up != false) {
						dev_data->link_up = false;
						net_eth_carrier_off(
							get_iface(dev_data,
								  vlan_tag));
					}
				}
			}
		}
	}
}

static void eth_isr(const struct device *dev)
{
	struct eth_stm32_hal_dev_data *dev_data;
	ETH_HandleTypeDef *heth;

	__ASSERT_NO_MSG(dev != NULL);

	dev_data = dev->data;

	__ASSERT_NO_MSG(dev_data != NULL);

	heth = &dev_data->heth;

	__ASSERT_NO_MSG(heth != NULL);

	HAL_ETH_IRQHandler(heth);
}
#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
void HAL_ETH_TxCpltCallback(ETH_HandleTypeDef *heth_handle)
{
	__ASSERT_NO_MSG(heth_handle != NULL);

	struct eth_stm32_hal_dev_data *dev_data =
		CONTAINER_OF(heth_handle, struct eth_stm32_hal_dev_data, heth);

	__ASSERT_NO_MSG(dev_data != NULL);

	k_sem_give(&dev_data->tx_int_sem);

}
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */

#if defined(CONFIG_ETH_STM32_HAL_API_V2)
void HAL_ETH_ErrorCallback(ETH_HandleTypeDef *heth)
{
	__ASSERT_NO_MSG(heth != NULL);

	const uint32_t error_code = HAL_ETH_GetError(heth);

	switch (error_code) {
	case HAL_ETH_ERROR_DMA:
		LOG_ERR("%s errorcode:%x dmaerror:%x",
			__func__,
			error_code,
			HAL_ETH_GetDMAError(heth));
		break;
	case HAL_ETH_ERROR_MAC:
		LOG_ERR("%s errorcode:%x macerror:%x",
			__func__,
			error_code,
			HAL_ETH_GetMACError(heth));
		break;
	default:
		LOG_ERR("%s errorcode:%x",
			__func__,
			error_code);
	}
}
#elif defined(CONFIG_SOC_SERIES_STM32H7X)
/* DMA and MAC errors callback only appear in H7 series */
void HAL_ETH_DMAErrorCallback(ETH_HandleTypeDef *heth_handle)
{
	__ASSERT_NO_MSG(heth_handle != NULL);

	LOG_ERR("%s errorcode:%x dmaerror:%x",
		__func__,
		HAL_ETH_GetError(heth_handle),
		HAL_ETH_GetDMAError(heth_handle));

	/* State of eth handle is ERROR in case of unrecoverable error */
	/* unrecoverable (ETH_DMACSR_FBE | ETH_DMACSR_TPS | ETH_DMACSR_RPS) */
	if (HAL_ETH_GetState(heth_handle) == HAL_ETH_STATE_ERROR) {
		LOG_ERR("%s ethernet in error state", __func__);
		/* TODO restart the ETH peripheral to recover */
		return;
	}

	/* Recoverable errors don't put ETH in error state */
	/* ETH_DMACSR_CDE | ETH_DMACSR_ETI | ETH_DMACSR_RWT */
	/* | ETH_DMACSR_RBU | ETH_DMACSR_AIS) */

	/* TODO Check if we were TX transmitting and the unlock semaphore */
	/* To return the error as soon as possible else we'll just wait */
	/* for the timeout */


}
void HAL_ETH_MACErrorCallback(ETH_HandleTypeDef *heth_handle)
{
	__ASSERT_NO_MSG(heth_handle != NULL);

	/* MAC errors dumping */
	LOG_ERR("%s errorcode:%x macerror:%x",
		__func__,
		HAL_ETH_GetError(heth_handle),
		HAL_ETH_GetMACError(heth_handle));

	/* State of eth handle is ERROR in case of unrecoverable error */
	if (HAL_ETH_GetState(heth_handle) == HAL_ETH_STATE_ERROR) {
		LOG_ERR("%s ethernet in error state", __func__);
		/* TODO restart or reconfig ETH peripheral to recover */

		return;
	}
}
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

void HAL_ETH_RxCpltCallback(ETH_HandleTypeDef *heth_handle)
{
	__ASSERT_NO_MSG(heth_handle != NULL);

	struct eth_stm32_hal_dev_data *dev_data =
		CONTAINER_OF(heth_handle, struct eth_stm32_hal_dev_data, heth);

	__ASSERT_NO_MSG(dev_data != NULL);

	k_sem_give(&dev_data->rx_int_sem);
}

#if defined(CONFIG_ETH_STM32_HAL_RANDOM_MAC)
static void generate_mac(uint8_t *mac_addr)
{
	gen_random_mac(mac_addr, ST_OUI_B0, ST_OUI_B1, ST_OUI_B2);
}
#endif

static int eth_initialize(const struct device *dev)
{
	struct eth_stm32_hal_dev_data *dev_data;
	const struct eth_stm32_hal_dev_cfg *cfg;
	ETH_HandleTypeDef *heth;
	HAL_StatusTypeDef hal_ret = HAL_OK;
	int ret = 0;

	__ASSERT_NO_MSG(dev != NULL);

	dev_data = dev->data;
	cfg = dev->config;

	__ASSERT_NO_MSG(dev_data != NULL);
	__ASSERT_NO_MSG(cfg != NULL);

	dev_data->clock = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);

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

	/* enable clock */
	ret = clock_control_on(dev_data->clock,
		(clock_control_subsys_t *)&cfg->pclken);
	ret |= clock_control_on(dev_data->clock,
		(clock_control_subsys_t *)&cfg->pclken_tx);
	ret |= clock_control_on(dev_data->clock,
		(clock_control_subsys_t *)&cfg->pclken_rx);
#if DT_INST_CLOCKS_HAS_NAME(0, mac_clk_ptp)
	ret |= clock_control_on(dev_data->clock,
		(clock_control_subsys_t *)&cfg->pclken_ptp);
#endif

	if (ret) {
		LOG_ERR("Failed to enable ethernet clock");
		return -EIO;
	}

	/* configure pinmux */
	ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
	if (ret < 0) {
		LOG_ERR("Could not configure ethernet pins");
		return ret;
	}

	heth = &dev_data->heth;

#if defined(CONFIG_ETH_STM32_HAL_RANDOM_MAC)
	generate_mac(dev_data->mac_addr);
#endif
	heth->Init.MACAddr = dev_data->mac_addr;

#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
	heth->Init.TxDesc = dma_tx_desc_tab;
	heth->Init.RxDesc = dma_rx_desc_tab;
	heth->Init.RxBuffLen = ETH_STM32_RX_BUF_SIZE;
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */

	hal_ret = HAL_ETH_Init(heth);
	if (hal_ret == HAL_TIMEOUT) {
		/* HAL Init time out. This could be linked to */
		/* a recoverable error. Log the issue and continue */
		/* driver initialisation */
		LOG_ERR("HAL_ETH_Init Timed out");
	} else if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_Init failed: %d", hal_ret);
		return -EINVAL;
	}

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
	/* Enable timestamping of RX packets. We enable all packets to be
	 * timestamped to cover both IEEE 1588 and gPTP.
	 */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSENALL;
#else
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSSARFE;
#endif /* CONFIG_SOC_SERIES_STM32H7X */
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
	/* Tx config init: */
	memset(&tx_config, 0, sizeof(ETH_TxPacketConfig));
	tx_config.Attributes = ETH_TX_PACKETS_FEATURES_CSUM |
				ETH_TX_PACKETS_FEATURES_CRCPAD;
	tx_config.ChecksumCtrl = ETH_CHECKSUM_IPHDR_PAYLOAD_INSERT_PHDR_CALC;
	tx_config.CRCPadCtrl = ETH_CRC_PAD_INSERT;
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */

	dev_data->link_up = false;

	/* Initialize semaphores */
	k_mutex_init(&dev_data->tx_mutex);
	k_sem_init(&dev_data->rx_int_sem, 0, K_SEM_MAX_LIMIT);
#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
	k_sem_init(&dev_data->tx_int_sem, 0, K_SEM_MAX_LIMIT);
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */

	/* Start interruption-poll thread */
	k_thread_create(&dev_data->rx_thread, dev_data->rx_thread_stack,
			K_KERNEL_STACK_SIZEOF(dev_data->rx_thread_stack),
			rx_thread, (void *) dev, NULL, NULL,
			K_PRIO_COOP(CONFIG_ETH_STM32_HAL_RX_THREAD_PRIO),
			0, K_NO_WAIT);

	k_thread_name_set(&dev_data->rx_thread, "stm_eth");

#if defined(CONFIG_ETH_STM32_HAL_API_V2)

	/* prepare tx buffer header */
	for (uint16_t i = 0; i < ETH_TXBUFNB; ++i) {
		dma_tx_buffer_header[i].tx_buff.buffer = dma_tx_buffer[i];
	}

	hal_ret = HAL_ETH_Start_IT(heth);
#elif defined(CONFIG_SOC_SERIES_STM32H7X)
	for (uint32_t i = 0; i < ETH_RX_DESC_CNT; i++) {
		hal_ret = HAL_ETH_DescAssignMemory(heth, i, dma_rx_buffer[i],
						   NULL);
		if (hal_ret != HAL_OK) {
			LOG_ERR("HAL_ETH_DescAssignMemory: failed: %d, i: %d",
				hal_ret, i);
			return -EINVAL;
		}
	}

	hal_ret = HAL_ETH_Start_IT(heth);
#else
	HAL_ETH_DMATxDescListInit(heth, dma_tx_desc_tab,
		&dma_tx_buffer[0][0], ETH_TXBUFNB);
	HAL_ETH_DMARxDescListInit(heth, dma_rx_desc_tab,
		&dma_rx_buffer[0][0], ETH_RXBUFNB);

	hal_ret = HAL_ETH_Start(heth);
#endif /* CONFIG_ETH_STM32_HAL_API_V2 */

	if (hal_ret != HAL_OK) {
		LOG_ERR("HAL_ETH_Start{_IT} failed");
	}

	disable_mcast_filter(heth);

#if defined(CONFIG_SOC_SERIES_STM32H7X) || defined(CONFIG_ETH_STM32_HAL_API_V2)
	/* Adjust MDC clock range depending on HCLK frequency: */
	HAL_ETH_SetMDIOClockRange(heth);

	/* @TODO: read duplex mode and speed from PHY and set it to ETH */

	ETH_MACConfigTypeDef mac_config;

	HAL_ETH_GetMACConfig(heth, &mac_config);
	mac_config.DuplexMode = ETH_FULLDUPLEX_MODE;
	mac_config.Speed = ETH_SPEED_100M;
	HAL_ETH_SetMACConfig(heth, &mac_config);
#endif /* CONFIG_SOC_SERIES_STM32H7X || CONFIG_ETH_STM32_HAL_API_V2 */

	LOG_DBG("MAC %02x:%02x:%02x:%02x:%02x:%02x",
		dev_data->mac_addr[0], dev_data->mac_addr[1],
		dev_data->mac_addr[2], dev_data->mac_addr[3],
		dev_data->mac_addr[4], dev_data->mac_addr[5]);

	return 0;
}

static void eth_iface_init(struct net_if *iface)
{
	const struct device *dev;
	struct eth_stm32_hal_dev_data *dev_data;
	bool is_first_init = false;

	__ASSERT_NO_MSG(iface != NULL);

	dev = net_if_get_device(iface);
	__ASSERT_NO_MSG(dev != NULL);

	dev_data = dev->data;
	__ASSERT_NO_MSG(dev_data != NULL);

	/* For VLAN, this value is only used to get the correct L2 driver.
	 * The iface pointer in context should contain the main interface
	 * if the VLANs are enabled.
	 */
	if (dev_data->iface == NULL) {
		dev_data->iface = iface;
		is_first_init = true;
	}

	/* Register Ethernet MAC Address with the upper layer */
	net_if_set_link_addr(iface, dev_data->mac_addr,
			     sizeof(dev_data->mac_addr),
			     NET_LINK_ETHERNET);

	ethernet_init(iface);

	net_if_carrier_off(iface);

	net_lldp_set_lldpdu(iface);

	if (is_first_init) {
		const struct eth_stm32_hal_dev_cfg *cfg = dev->config;
		/* Now that the iface is setup, we are safe to enable IRQs. */
		__ASSERT_NO_MSG(cfg->config_func != NULL);
		cfg->config_func();
	}
}

static enum ethernet_hw_caps eth_stm32_hal_get_capabilities(const struct device *dev)
{
	ARG_UNUSED(dev);

	return ETHERNET_LINK_10BASE_T | ETHERNET_LINK_100BASE_T
#if defined(CONFIG_NET_VLAN)
		| ETHERNET_HW_VLAN
#endif
#if defined(CONFIG_NET_PROMISCUOUS_MODE)
		| ETHERNET_PROMISC_MODE
#endif
#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
		| ETHERNET_PTP
#endif
#if defined(CONFIG_NET_LLDP)
		| ETHERNET_LLDP
#endif
		;
}

static int eth_stm32_hal_set_config(const struct device *dev,
				    enum ethernet_config_type type,
				    const struct ethernet_config *config)
{
	int ret = -ENOTSUP;
	struct eth_stm32_hal_dev_data *dev_data;
	ETH_HandleTypeDef *heth;

	dev_data = dev->data;
	heth = &dev_data->heth;

	switch (type) {
	case ETHERNET_CONFIG_TYPE_MAC_ADDRESS:
		memcpy(dev_data->mac_addr, config->mac_address.addr, 6);
		heth->Instance->MACA0HR = (dev_data->mac_addr[5] << 8) |
			dev_data->mac_addr[4];
		heth->Instance->MACA0LR = (dev_data->mac_addr[3] << 24) |
			(dev_data->mac_addr[2] << 16) |
			(dev_data->mac_addr[1] << 8) |
			dev_data->mac_addr[0];
		net_if_set_link_addr(dev_data->iface, dev_data->mac_addr,
				     sizeof(dev_data->mac_addr),
				     NET_LINK_ETHERNET);
		ret = 0;
		break;
	case ETHERNET_CONFIG_TYPE_PROMISC_MODE:
#if defined(CONFIG_NET_PROMISCUOUS_MODE)
#if defined(CONFIG_SOC_SERIES_STM32H7X)
		if (config->promisc_mode) {
			heth->Instance->MACPFR |= ETH_MACPFR_PR;
		} else {
			heth->Instance->MACPFR &= ~ETH_MACPFR_PR;
		}
#else
		if (config->promisc_mode) {
			heth->Instance->MACFFR |= ETH_MACFFR_PM;
		} else {
			heth->Instance->MACFFR &= ~ETH_MACFFR_PM;
		}
#endif  /* CONFIG_SOC_SERIES_STM32H7X */
		ret = 0;
#endif /* CONFIG_NET_PROMISCUOUS_MODE */
		break;
	default:
		break;
	}

	return ret;
}

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
static const struct device *eth_stm32_get_ptp_clock(const struct device *dev)
{
	struct eth_stm32_hal_dev_data *dev_data = dev->data;

	return dev_data->ptp_clock;
}
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */

static const struct ethernet_api eth_api = {
	.iface_api.init = eth_iface_init,
#if defined(CONFIG_PTP_CLOCK_STM32_HAL)
	.get_ptp_clock = eth_stm32_get_ptp_clock,
#endif /* CONFIG_PTP_CLOCK_STM32_HAL */
	.get_capabilities = eth_stm32_hal_get_capabilities,
	.set_config = eth_stm32_hal_set_config,
	.send = eth_tx,
};

static void eth0_irq_config(void)
{
	IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), eth_isr,
		    DEVICE_DT_INST_GET(0), 0);
	irq_enable(DT_INST_IRQN(0));
}

PINCTRL_DT_INST_DEFINE(0);

static const struct eth_stm32_hal_dev_cfg eth0_config = {
	.config_func = eth0_irq_config,
	.pclken = {.bus = DT_INST_CLOCKS_CELL_BY_NAME(0, stmmaceth, bus),
		   .enr = DT_INST_CLOCKS_CELL_BY_NAME(0, stmmaceth, bits)},
	.pclken_tx = {.bus = DT_INST_CLOCKS_CELL_BY_NAME(0, mac_clk_tx, bus),
		      .enr = DT_INST_CLOCKS_CELL_BY_NAME(0, mac_clk_tx, bits)},
	.pclken_rx = {.bus = DT_INST_CLOCKS_CELL_BY_NAME(0, mac_clk_rx, bus),
		      .enr = DT_INST_CLOCKS_CELL_BY_NAME(0, mac_clk_rx, bits)},
#if DT_INST_CLOCKS_HAS_NAME(0, mac_clk_ptp)
	.pclken_ptp = {.bus = DT_INST_CLOCKS_CELL_BY_NAME(0, mac_clk_ptp, bus),
		       .enr = DT_INST_CLOCKS_CELL_BY_NAME(0, mac_clk_ptp, bits)},
#endif
	.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(0),
};

static struct eth_stm32_hal_dev_data eth0_data = {
	.heth = {
		.Instance = (ETH_TypeDef *)DT_INST_REG_ADDR(0),
		.Init = {
#if !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_ETH_STM32_HAL_API_V2)
#if defined(CONFIG_ETH_STM32_AUTO_NEGOTIATION_ENABLE)
			.AutoNegotiation = ETH_AUTONEGOTIATION_ENABLE,
#else
			.AutoNegotiation = ETH_AUTONEGOTIATION_DISABLE,
#if defined(CONFIG_ETH_STM32_SPEED_10M)
			.Speed = ETH_SPEED_10M,
#else
			.Speed = ETH_SPEED_100M,
#endif
#if defined(CONFIG_ETH_STM32_MODE_HALFDUPLEX)
			.DuplexMode = ETH_MODE_HALFDUPLEX,
#else
			.DuplexMode = ETH_MODE_FULLDUPLEX,
#endif
#endif /* !CONFIG_ETH_STM32_AUTO_NEGOTIATION_ENABLE */
			.PhyAddress = PHY_ADDR,
			.RxMode = ETH_RXINTERRUPT_MODE,
			.ChecksumMode = ETH_CHECKSUM_BY_SOFTWARE,
#endif /* !CONFIG_SOC_SERIES_STM32H7X */
#if defined(CONFIG_ETH_STM32_HAL_MII)
			.MediaInterface = ETH_MEDIA_INTERFACE_MII,
#else
			.MediaInterface = ETH_MEDIA_INTERFACE_RMII,
#endif
		},
	},
	.mac_addr = {
		ST_OUI_B0,
		ST_OUI_B1,
		ST_OUI_B2,
#if !defined(CONFIG_ETH_STM32_HAL_RANDOM_MAC)
		CONFIG_ETH_STM32_HAL_MAC3,
		CONFIG_ETH_STM32_HAL_MAC4,
		CONFIG_ETH_STM32_HAL_MAC5
#endif
	},
};

ETH_NET_DEVICE_DT_INST_DEFINE(0, eth_initialize,
		    NULL, &eth0_data, &eth0_config,
		    CONFIG_ETH_INIT_PRIORITY, &eth_api, ETH_STM32_HAL_MTU);

#if defined(CONFIG_PTP_CLOCK_STM32_HAL)

struct ptp_context {
	struct eth_stm32_hal_dev_data *eth_dev_data;
};

static struct ptp_context ptp_stm32_0_context;

static int ptp_clock_stm32_set(const struct device *dev,
			      struct net_ptp_time *tm)
{
	struct ptp_context *ptp_context = dev->data;
	struct eth_stm32_hal_dev_data *eth_dev_data = ptp_context->eth_dev_data;
	ETH_HandleTypeDef *heth = &eth_dev_data->heth;
	unsigned int key;

	key = irq_lock();

#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACSTSUR = tm->second;
	heth->Instance->MACSTNUR = tm->nanosecond;
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSINIT;
	while (heth->Instance->MACTSCR & ETH_MACTSCR_TSINIT_Msk) {
		/* spin lock */
	}
#else
	heth->Instance->PTPTSHUR = tm->second;
	heth->Instance->PTPTSLUR = tm->nanosecond;
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSSTI;
	while (heth->Instance->PTPTSCR & ETH_PTPTSCR_TSSTI_Msk) {
		/* spin lock */
	}
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	irq_unlock(key);

	return 0;
}

static int ptp_clock_stm32_get(const struct device *dev,
			      struct net_ptp_time *tm)
{
	struct ptp_context *ptp_context = dev->data;
	struct eth_stm32_hal_dev_data *eth_dev_data = ptp_context->eth_dev_data;
	ETH_HandleTypeDef *heth = &eth_dev_data->heth;
	unsigned int key;
	uint32_t second_2;

	key = irq_lock();

#if defined(CONFIG_SOC_SERIES_STM32H7X)
	tm->second = heth->Instance->MACSTSR;
	tm->nanosecond = heth->Instance->MACSTNR;
	second_2 = heth->Instance->MACSTSR;
#else
	tm->second = heth->Instance->PTPTSHR;
	tm->nanosecond = heth->Instance->PTPTSLR;
	second_2 = heth->Instance->PTPTSHR;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	irq_unlock(key);

	if (tm->second != second_2 && tm->nanosecond < NSEC_PER_SEC / 2) {
		/* Second rollover has happened during first measurement: second register
		 * was read before second boundary and nanosecond register was read after.
		 * We will use second_2 as a new second value.
		 */
		tm->second = second_2;
	}

	return 0;
}

static int ptp_clock_stm32_adjust(const struct device *dev, int increment)
{
	struct ptp_context *ptp_context = dev->data;
	struct eth_stm32_hal_dev_data *eth_dev_data = ptp_context->eth_dev_data;
	ETH_HandleTypeDef *heth = &eth_dev_data->heth;
	int key, ret;

	if ((increment <= (int32_t)(-NSEC_PER_SEC)) ||
			(increment >= (int32_t)NSEC_PER_SEC)) {
		ret = -EINVAL;
	} else {
		key = irq_lock();

#if defined(CONFIG_SOC_SERIES_STM32H7X)
		heth->Instance->MACSTSUR = 0;
		if (increment >= 0) {
			heth->Instance->MACSTNUR = increment;
		} else {
			heth->Instance->MACSTNUR = ETH_MACSTNUR_ADDSUB | (NSEC_PER_SEC + increment);
		}
		heth->Instance->MACTSCR |= ETH_MACTSCR_TSUPDT;
		while (heth->Instance->MACTSCR & ETH_MACTSCR_TSUPDT_Msk) {
			/* spin lock */
		}
#else
		heth->Instance->PTPTSHUR = 0;
		if (increment >= 0) {
			heth->Instance->PTPTSLUR = increment;
		} else {
			heth->Instance->PTPTSLUR = ETH_PTPTSLUR_TSUPNS | (-increment);
		}
		heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSSTU;
		while (heth->Instance->PTPTSCR & ETH_PTPTSCR_TSSTU_Msk) {
			/* spin lock */
		}
#endif /* CONFIG_SOC_SERIES_STM32H7X */

		ret = 0;
		irq_unlock(key);
	}

	return ret;
}

static int ptp_clock_stm32_rate_adjust(const struct device *dev, double ratio)
{
	struct ptp_context *ptp_context = dev->data;
	struct eth_stm32_hal_dev_data *eth_dev_data = ptp_context->eth_dev_data;
	ETH_HandleTypeDef *heth = &eth_dev_data->heth;
	int key, ret;
	uint32_t addend_val;

	/* No change needed */
	if (ratio == 1.0f) {
		return 0;
	}

	key = irq_lock();

	ratio *= eth_dev_data->clk_ratio_adj;

	/* Limit possible ratio */
	if (ratio * 100 < CONFIG_ETH_STM32_HAL_PTP_CLOCK_ADJ_MIN_PCT ||
			ratio * 100 > CONFIG_ETH_STM32_HAL_PTP_CLOCK_ADJ_MAX_PCT) {
		ret = -EINVAL;
		goto error;
	}

	/* Save new ratio */
	eth_dev_data->clk_ratio_adj = ratio;

	/* Update addend register */
	addend_val = UINT32_MAX * eth_dev_data->clk_ratio * ratio;

#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACTSAR = addend_val;
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSADDREG;
	while (heth->Instance->MACTSCR & ETH_MACTSCR_TSADDREG_Msk) {
		/* spin lock */
	}
#else
	heth->Instance->PTPTSAR = addend_val;
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSARU;
	while (heth->Instance->PTPTSCR & ETH_PTPTSCR_TSARU_Msk) {
		/* spin lock */
	}
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	ret = 0;

error:
	irq_unlock(key);

	return ret;
}

static const struct ptp_clock_driver_api api = {
	.set = ptp_clock_stm32_set,
	.get = ptp_clock_stm32_get,
	.adjust = ptp_clock_stm32_adjust,
	.rate_adjust = ptp_clock_stm32_rate_adjust,
};

static int ptp_stm32_init(const struct device *port)
{
	const struct device *const dev = DEVICE_DT_GET(DT_NODELABEL(mac));
	struct eth_stm32_hal_dev_data *eth_dev_data = dev->data;
	const struct eth_stm32_hal_dev_cfg *eth_cfg = dev->config;
	struct ptp_context *ptp_context = port->data;
	ETH_HandleTypeDef *heth = &eth_dev_data->heth;
	int ret;
	uint32_t ptp_hclk_rate;
	uint32_t ss_incr_ns;
	uint32_t addend_val;

	eth_dev_data->ptp_clock = port;
	ptp_context->eth_dev_data = eth_dev_data;

	/* Mask the Timestamp Trigger interrupt */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACIER &= ~(ETH_MACIER_TSIE);
#else
	heth->Instance->MACIMR &= ~(ETH_MACIMR_TSTIM);
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	/* Enable timestamping */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSENA;
#else
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSE;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	/* Query ethernet clock rate */
	ret = clock_control_get_rate(eth_dev_data->clock,
#if defined(CONFIG_SOC_SERIES_STM32H7X)
		(clock_control_subsys_t *)&eth_cfg->pclken,
#else
		(clock_control_subsys_t *)&eth_cfg->pclken_ptp,
#endif /* CONFIG_SOC_SERIES_STM32H7X */
		&ptp_hclk_rate);
	if (ret) {
		LOG_ERR("Failed to query ethernet clock");
		return -EIO;
	}

	/* Program the subsecond increment register based on the PTP clock freq */
	if (NSEC_PER_SEC % CONFIG_ETH_STM32_HAL_PTP_CLOCK_SRC_HZ != 0) {
		LOG_ERR("PTP clock period must be an integer nanosecond value");
		return -EINVAL;
	}
	ss_incr_ns = NSEC_PER_SEC / CONFIG_ETH_STM32_HAL_PTP_CLOCK_SRC_HZ;
	if (ss_incr_ns > UINT8_MAX) {
		LOG_ERR("PTP clock period is more than %d nanoseconds", UINT8_MAX);
		return -EINVAL;
	}
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACSSIR = ss_incr_ns << ETH_MACMACSSIR_SSINC_Pos;
#else
	heth->Instance->PTPSSIR = ss_incr_ns;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	/* Program timestamp addend register */
	eth_dev_data->clk_ratio =
		((double)CONFIG_ETH_STM32_HAL_PTP_CLOCK_SRC_HZ) / ((double)ptp_hclk_rate);
	/*
	 * clk_ratio is a ratio between desired PTP clock frequency and HCLK rate.
	 * Because HCLK is defined by a physical oscillator, it might drift due
	 * to manufacturing tolerances and environmental effects (e.g. temperature).
	 * clk_ratio_adj compensates for such inaccuracies. It starts off as 1.0
	 * and gets adjusted by calling ptp_clock_stm32_rate_adjust().
	 */
	eth_dev_data->clk_ratio_adj = 1.0f;
	addend_val =
		UINT32_MAX * eth_dev_data->clk_ratio * eth_dev_data->clk_ratio_adj;
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACTSAR = addend_val;
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSADDREG;
	while (heth->Instance->MACTSCR & ETH_MACTSCR_TSADDREG_Msk) {
		k_yield();
	}
#else
	heth->Instance->PTPTSAR = addend_val;
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSARU;
	while (heth->Instance->PTPTSCR & ETH_PTPTSCR_TSARU_Msk) {
		k_yield();
	}
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	/* Enable fine timestamp correction method */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSCFUPDT;
#else
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSFCU;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	/* Enable nanosecond rollover into a new second */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSCTRLSSR;
#else
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSSSR;
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	/* Initialize timestamp */
#if defined(CONFIG_SOC_SERIES_STM32H7X)
	heth->Instance->MACSTSUR = 0;
	heth->Instance->MACSTNUR = 0;
	heth->Instance->MACTSCR |= ETH_MACTSCR_TSINIT;
	while (heth->Instance->MACTSCR & ETH_MACTSCR_TSINIT_Msk) {
		k_yield();
	}
#else
	heth->Instance->PTPTSHUR = 0;
	heth->Instance->PTPTSLUR = 0;
	heth->Instance->PTPTSCR |= ETH_PTPTSCR_TSSTI;
	while (heth->Instance->PTPTSCR & ETH_PTPTSCR_TSSTI_Msk) {
		k_yield();
	}
#endif /* CONFIG_SOC_SERIES_STM32H7X */

	return 0;
}

DEVICE_DEFINE(stm32_ptp_clock_0, PTP_CLOCK_NAME, ptp_stm32_init,
		NULL, &ptp_stm32_0_context, NULL, POST_KERNEL,
		CONFIG_ETH_STM32_HAL_PTP_CLOCK_INIT_PRIO, &api);

#endif /* CONFIG_PTP_CLOCK_STM32_HAL */