drivers/ethernet/eth_lan865x.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2023 DENX Software Engineering GmbH
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT microchip_lan865x

 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(eth_lan865x, CONFIG_ETHERNET_LOG_LEVEL);

 #include <zephyr/net/ethernet.h>
 #include <zephyr/net/phy.h>

 #include <string.h>
 #include <errno.h>

 #include <zephyr/net/net_if.h>
 #include <zephyr/net/ethernet.h>
 #include <zephyr/net/phy.h>
 #include <zephyr/drivers/ethernet/eth_lan865x.h>

 #include "eth_lan865x_priv.h"

 int eth_lan865x_mdio_c22_read(const struct device *dev, uint8_t prtad, uint8_t regad,
 			      uint16_t *data)
 {
 	struct lan865x_data *ctx = dev->data;

 	return oa_tc6_mdio_read(ctx->tc6, prtad, regad, data);
 }

 int eth_lan865x_mdio_c22_write(const struct device *dev, uint8_t prtad, uint8_t regad,
 			       uint16_t data)
 {
 	struct lan865x_data *ctx = dev->data;

 	return oa_tc6_mdio_write(ctx->tc6, prtad, regad, data);
 }

 int eth_lan865x_mdio_c45_read(const struct device *dev, uint8_t prtad, uint8_t devad,
 			      uint16_t regad, uint16_t *data)
 {
 	struct lan865x_data *ctx = dev->data;

 	return oa_tc6_mdio_read_c45(ctx->tc6, prtad, devad, regad, data);
 }

 int eth_lan865x_mdio_c45_write(const struct device *dev, uint8_t prtad, uint8_t devad,
 			       uint16_t regad, uint16_t data)
 {
 	struct lan865x_data *ctx = dev->data;

 	return oa_tc6_mdio_write_c45(ctx->tc6, prtad, devad, regad, data);
 }

 static int lan865x_mac_rxtx_control(const struct device *dev, bool en)
 {
 	struct lan865x_data *ctx = dev->data;
 	uint32_t ctl = 0;

 	if (en) {
 		ctl = LAN865x_MAC_NCR_TXEN | LAN865x_MAC_NCR_RXEN;
 	}

 	return oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_NCR, ctl);
 }

 static int lan865x_enable_sync(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	uint32_t val;
 	int ret;

 	ret = oa_tc6_reg_read(ctx->tc6, OA_CONFIG0, &val);
 	if (ret) {
 		return ret;
 	}
 	val |= OA_CONFIG0_SYNC | OA_CONFIG0_RFA_ZARFE;
 	ret = oa_tc6_reg_write(ctx->tc6, OA_CONFIG0, val);
 	if (ret) {
 		return ret;
 	}

 	return lan865x_mac_rxtx_control(dev, LAN865x_MAC_TXRX_ON);
 }

 static void lan865x_iface_init(struct net_if *iface)
 {
 	const struct device *dev = net_if_get_device(iface);
 	struct lan865x_data *ctx = dev->data;
 	int ret;

 	ret = lan865x_enable_sync(dev);
 	if (ret) {
 		LOG_ERR("LAN865x sync enable failed: %d\n", ret);
 		return;
 	}

 	net_if_set_link_addr(iface, ctx->mac_address, sizeof(ctx->mac_address), NET_LINK_ETHERNET);

 	if (ctx->iface == NULL) {
 		ctx->iface = iface;
 	}

 	ethernet_init(iface);

 	net_eth_carrier_on(iface);
 	ctx->iface_initialized = true;
 }

 static enum ethernet_hw_caps lan865x_port_get_capabilities(const struct device *dev)
 {
 	ARG_UNUSED(dev);
 	return ETHERNET_LINK_10BASE | ETHERNET_PROMISC_MODE;
 }

 static int lan865x_gpio_reset(const struct device *dev);
 static void lan865x_write_macaddress(const struct device *dev);
 static int lan865x_set_config(const struct device *dev, enum ethernet_config_type type,
 			      const struct ethernet_config *config)
 {
 	const struct lan865x_config *cfg = dev->config;
 	struct lan865x_data *ctx = dev->data;
 	struct phy_plca_cfg plca_cfg;

 	if (type == ETHERNET_CONFIG_TYPE_PROMISC_MODE) {
 		return oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_NCFGR, LAN865x_MAC_NCFGR_CAF);
 	}

 	if (type == ETHERNET_CONFIG_TYPE_MAC_ADDRESS) {
 		memcpy(ctx->mac_address, config->mac_address.addr, sizeof(ctx->mac_address));

 		lan865x_write_macaddress(dev);

 		return net_if_set_link_addr(ctx->iface, ctx->mac_address, sizeof(ctx->mac_address),
 					    NET_LINK_ETHERNET);
 	}

 	if (type == ETHERNET_CONFIG_TYPE_T1S_PARAM) {
 		if (config->t1s_param.type == ETHERNET_T1S_PARAM_TYPE_PLCA_CONFIG) {
 			plca_cfg.enable = config->t1s_param.plca.enable;
 			plca_cfg.node_id = config->t1s_param.plca.node_id;
 			plca_cfg.node_count = config->t1s_param.plca.node_count;
 			plca_cfg.burst_count = config->t1s_param.plca.burst_count;
 			plca_cfg.burst_timer = config->t1s_param.plca.burst_timer;
 			plca_cfg.to_timer = config->t1s_param.plca.to_timer;

 			return phy_set_plca_cfg(cfg->phy, &plca_cfg);
 		}
 	}

 	return -ENOTSUP;
 }

 static int lan865x_wait_for_reset(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	uint8_t i;

 	/* Wait for end of LAN865x reset */
 	for (i = 0; !ctx->reset && i < LAN865X_RESET_TIMEOUT; i++) {
 		k_msleep(1);
 	}

 	if (i == LAN865X_RESET_TIMEOUT) {
 		LOG_ERR("LAN865x reset timeout reached!");
 		return -ENODEV;
 	}

 	return 0;
 }

 static int lan865x_gpio_reset(const struct device *dev)
 {
 	const struct lan865x_config *cfg = dev->config;
 	struct lan865x_data *ctx = dev->data;

 	ctx->reset = false;
 	ctx->tc6->protected = false;

 	/* Perform (GPIO based) HW reset */
 	/* assert RESET_N low for 10 µs (5 µs min) */
 	gpio_pin_set_dt(&cfg->reset, 1);
 	k_busy_wait(10U);
 	/* deassert - end of reset indicated by IRQ_N low  */
 	gpio_pin_set_dt(&cfg->reset, 0);

 	return lan865x_wait_for_reset(dev);
 }

 static int lan865x_check_spi(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	uint32_t val;
 	int ret;

 	ret = oa_tc6_reg_read(ctx->tc6, LAN865x_DEVID, &val);
 	if (ret < 0) {
 		return -ENODEV;
 	}

 	ctx->silicon_rev = val & LAN865X_REV_MASK;
 	if (ctx->silicon_rev != 1 && ctx->silicon_rev != 2) {
 		return -ENODEV;
 	}

 	ctx->chip_id = (val >> 4) & 0xFFFF;
 	if (ctx->chip_id != LAN8650_DEVID && ctx->chip_id != LAN8651_DEVID) {
 		return -ENODEV;
 	}

 	return ret;
 }

 static void lan865x_write_macaddress(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	uint8_t *mac = &ctx->mac_address[0];
 	uint32_t val;

 	/* SPEC_ADD2_BOTTOM */
 	val = (mac[3] << 24) | (mac[2] << 16) | (mac[1] << 8) | mac[0];
 	oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_SAB2, val);

 	/* SPEC_ADD2_TOP */
 	val = (mac[5] << 8) | mac[4];
 	oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_SAT2, val);

 	/*
 	 * SPEC_ADD1_BOTTOM - setting unique lower MAC address, back off time is
 	 * generated out of it.
 	 */
 	val = (mac[5] << 24) | (mac[4] << 16) | (mac[3] << 8) | mac[2];
 	oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_SAB1, val);
 }

 static int lan865x_set_specific_multicast_addr(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	uint32_t mac_h_hash = 0xffffffff;
 	uint32_t mac_l_hash = 0xffffffff;
 	int ret;

 	/* Enable hash for all multicast addresses */
 	ret = oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_HRT, mac_h_hash);
 	if (ret) {
 		return ret;
 	}

 	ret = oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_HRB, mac_l_hash);
 	if (ret) {
 		return ret;
 	}

 	return oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_NCFGR, LAN865x_MAC_NCFGR_MTIHEN);
 }

 static int lan865x_default_config(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	int ret;

 	/* Enable protected control RW */
 	oa_tc6_set_protected_ctrl(ctx->tc6, true);

 	ret = oa_tc6_reg_write(ctx->tc6, LAN865X_FIXUP_REG, LAN865X_FIXUP_VALUE);
 	if (ret) {
 		return ret;
 	}

 	lan865x_write_macaddress(dev);
 	lan865x_set_specific_multicast_addr(dev);

 	return 0;
 }

 static void lan865x_int_callback(const struct device *dev, struct gpio_callback *cb, uint32_t pins)
 {
 	ARG_UNUSED(dev);
 	ARG_UNUSED(pins);

 	struct lan865x_data *ctx = CONTAINER_OF(cb, struct lan865x_data, gpio_int_callback);

 	k_sem_give(&ctx->int_sem);
 }

 static void lan865x_read_chunks(const struct device *dev)
 {
 	const struct lan865x_config *cfg = dev->config;
 	struct lan865x_data *ctx = dev->data;
 	struct oa_tc6 *tc6 = ctx->tc6;
 	struct net_pkt *pkt;
 	int ret;

 	pkt = net_pkt_rx_alloc(K_MSEC(cfg->timeout));
 	if (!pkt) {
 		LOG_ERR("OA RX: Could not allocate packet!");
 		return;
 	}

 	k_sem_take(&ctx->tx_rx_sem, K_FOREVER);
 	ret = oa_tc6_read_chunks(tc6, pkt);
 	if (ret < 0) {
 		eth_stats_update_errors_rx(ctx->iface);
 		net_pkt_unref(pkt);
 		k_sem_give(&ctx->tx_rx_sem);
 		return;
 	}

 	/* Feed buffer frame to IP stack */
 	ret = net_recv_data(ctx->iface, pkt);
 	if (ret < 0) {
 		LOG_ERR("OA RX: Could not process packet (%d)!", ret);
 		net_pkt_unref(pkt);
 	}
 	k_sem_give(&ctx->tx_rx_sem);
 }

 static void lan865x_int_thread(const struct device *dev)
 {
 	struct lan865x_data *ctx = dev->data;
 	struct oa_tc6 *tc6 = ctx->tc6;
 	uint32_t sts, ftr;
 	int ret;

 	while (true) {
 		k_sem_take(&ctx->int_sem, K_FOREVER);
 		if (!ctx->reset) {
 			oa_tc6_reg_read(tc6, OA_STATUS0, &sts);
 			if (sts & OA_STATUS0_RESETC) {
 				oa_tc6_reg_write(tc6, OA_STATUS0, sts);

 				lan865x_default_config(dev);

 				ctx->reset = true;
 				/*
 				 * According to OA T1S standard - it is mandatory to
 				 * read chunk of data to get the IRQ_N negated (deasserted).
 				 */
 				oa_tc6_read_status(tc6, &ftr);
 				continue;
 			}
 		}

 		/*
 		 * The IRQ_N is asserted when RCA becomes > 0. As described in
 		 * OPEN Alliance 10BASE-T1x standard it is deasserted when first
 		 * data header is received by LAN865x.
 		 *
 		 * Hence, it is mandatory to ALWAYS read at least one data chunk!
 		 */
 		do {
 			lan865x_read_chunks(dev);
 		} while (tc6->rca > 0);

 		ret = oa_tc6_check_status(tc6);
 		if (ret == -EIO) {
 			lan865x_gpio_reset(dev);
 		}
 	}
 }

 static int lan865x_init(const struct device *dev)
 {
 	const struct lan865x_config *cfg = dev->config;
 	struct lan865x_data *ctx = dev->data;
 	int ret;

 	__ASSERT(cfg->spi.config.frequency <= LAN865X_SPI_MAX_FREQUENCY,
 		 "SPI frequency exceeds supported maximum\n");

 	if (!spi_is_ready_dt(&cfg->spi)) {
 		LOG_ERR("SPI bus %s not ready", cfg->spi.bus->name);
 		return -ENODEV;
 	}

 	if (!gpio_is_ready_dt(&cfg->interrupt)) {
 		LOG_ERR("Interrupt GPIO device %s is not ready", cfg->interrupt.port->name);
 		return -ENODEV;
 	}

 	/* Check SPI communication after reset */
 	ret = lan865x_check_spi(dev);
 	if (ret < 0) {
 		LOG_ERR("SPI communication not working, %d", ret);
 		return ret;
 	}

 	/*
 	 * Configure interrupt service routine for LAN865x IRQ
 	 */
 	ret = gpio_pin_configure_dt(&cfg->interrupt, GPIO_INPUT);
 	if (ret < 0) {
 		LOG_ERR("Failed to configure interrupt GPIO, %d", ret);
 		return ret;
 	}

 	gpio_init_callback(&(ctx->gpio_int_callback), lan865x_int_callback,
 			   BIT(cfg->interrupt.pin));

 	ret = gpio_add_callback(cfg->interrupt.port, &ctx->gpio_int_callback);
 	if (ret < 0) {
 		LOG_ERR("Failed to add INT callback, %d", ret);
 		return ret;
 	}

 	gpio_pin_interrupt_configure_dt(&cfg->interrupt, GPIO_INT_EDGE_TO_ACTIVE);

 	/* Start interruption-poll thread */
 	ctx->tid_int = k_thread_create(
 		&ctx->thread, ctx->thread_stack, CONFIG_ETH_LAN865X_IRQ_THREAD_STACK_SIZE,
 		(k_thread_entry_t)lan865x_int_thread, (void *)dev, NULL, NULL,
 		K_PRIO_COOP(CONFIG_ETH_LAN865X_IRQ_THREAD_PRIO), 0, K_NO_WAIT);
 	k_thread_name_set(ctx->tid_int, "lan865x_interrupt");

 	/* Perform HW reset - 'rst-gpios' required property set in DT */
 	if (!gpio_is_ready_dt(&cfg->reset)) {
 		LOG_ERR("Reset GPIO device %s is not ready", cfg->reset.port->name);
 		return -ENODEV;
 	}

 	ret = gpio_pin_configure_dt(&cfg->reset, GPIO_OUTPUT_INACTIVE);
 	if (ret < 0) {
 		LOG_ERR("Failed to configure reset GPIO, %d", ret);
 		return ret;
 	}

 	return lan865x_gpio_reset(dev);
 }

 static int lan865x_port_send(const struct device *dev, struct net_pkt *pkt)
 {
 	struct lan865x_data *ctx = dev->data;
 	struct oa_tc6 *tc6 = ctx->tc6;
 	int ret;

 	k_sem_take(&ctx->tx_rx_sem, K_FOREVER);
 	ret = oa_tc6_send_chunks(tc6, pkt);

 	/* Check if rca > 0 during half-duplex TX transmission */
 	if (tc6->rca > 0) {
 		k_sem_give(&ctx->int_sem);
 	}

 	k_sem_give(&ctx->tx_rx_sem);
 	if (ret < 0) {
 		LOG_ERR("TX transmission error, %d", ret);
 		eth_stats_update_errors_tx(net_pkt_iface(pkt));
 		return ret;
 	}

 	return 0;
 }

 const struct device *lan865x_get_phy(const struct device *dev)
 {
 	const struct lan865x_config *cfg = dev->config;

 	return cfg->phy;
 }

 static const struct ethernet_api lan865x_api_func = {
 	.iface_api.init = lan865x_iface_init,
 	.get_capabilities = lan865x_port_get_capabilities,
 	.set_config = lan865x_set_config,
 	.send = lan865x_port_send,
 	.get_phy = lan865x_get_phy,
 };

 #define LAN865X_DEFINE(inst)                                                                       \
 	static const struct lan865x_config lan865x_config_##inst = {                               \
 		.spi = SPI_DT_SPEC_INST_GET(inst, SPI_WORD_SET(8)),                                \
 		.interrupt = GPIO_DT_SPEC_INST_GET(inst, int_gpios),                               \
 		.reset = GPIO_DT_SPEC_INST_GET(inst, rst_gpios),                                   \
 		.timeout = CONFIG_ETH_LAN865X_TIMEOUT,                                             \
 		.phy = DEVICE_DT_GET(                                                              \
 			DT_CHILD(DT_INST_CHILD(inst, lan865x_mdio), ethernet_phy_##inst))};        \
                                                                                                    \
 	struct oa_tc6 oa_tc6_##inst = {                                                            \
 		.cps = 64, .protected = 0, .spi = &lan865x_config_##inst.spi};                     \
 	static struct lan865x_data lan865x_data_##inst = {                                         \
 		.mac_address = DT_INST_PROP_OR(inst, local_mac_address, {0}),                      \
 		.tx_rx_sem = Z_SEM_INITIALIZER((lan865x_data_##inst).tx_rx_sem, 1, 1),             \
 		.int_sem = Z_SEM_INITIALIZER((lan865x_data_##inst).int_sem, 0, 1),                 \
 		.tc6 = &oa_tc6_##inst};                                                            \
                                                                                                    \
 	ETH_NET_DEVICE_DT_INST_DEFINE(inst, lan865x_init, NULL, &lan865x_data_##inst,              \
 				      &lan865x_config_##inst, CONFIG_ETH_LAN865X_INIT_PRIORITY,    \
 				      &lan865x_api_func, NET_ETH_MTU);

 DT_INST_FOREACH_STATUS_OKAY(LAN865X_DEFINE);
	/*
	* Copyright (c) 2023 DENX Software Engineering GmbH
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT microchip_lan865x

	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(eth_lan865x, CONFIG_ETHERNET_LOG_LEVEL);

	#include <zephyr/net/ethernet.h>
	#include <zephyr/net/phy.h>

	#include <string.h>
	#include <errno.h>

	#include <zephyr/net/net_if.h>
	#include <zephyr/net/ethernet.h>
	#include <zephyr/net/phy.h>
	#include <zephyr/drivers/ethernet/eth_lan865x.h>

	#include "eth_lan865x_priv.h"

	int eth_lan865x_mdio_c22_read(const struct device *dev, uint8_t prtad, uint8_t regad,
	uint16_t *data)
	{
	struct lan865x_data *ctx = dev->data;

	return oa_tc6_mdio_read(ctx->tc6, prtad, regad, data);
	}

	int eth_lan865x_mdio_c22_write(const struct device *dev, uint8_t prtad, uint8_t regad,
	uint16_t data)
	{
	struct lan865x_data *ctx = dev->data;

	return oa_tc6_mdio_write(ctx->tc6, prtad, regad, data);
	}

	int eth_lan865x_mdio_c45_read(const struct device *dev, uint8_t prtad, uint8_t devad,
	uint16_t regad, uint16_t *data)
	{
	struct lan865x_data *ctx = dev->data;

	return oa_tc6_mdio_read_c45(ctx->tc6, prtad, devad, regad, data);
	}

	int eth_lan865x_mdio_c45_write(const struct device *dev, uint8_t prtad, uint8_t devad,
	uint16_t regad, uint16_t data)
	{
	struct lan865x_data *ctx = dev->data;

	return oa_tc6_mdio_write_c45(ctx->tc6, prtad, devad, regad, data);
	}

	static int lan865x_mac_rxtx_control(const struct device *dev, bool en)
	{
	struct lan865x_data *ctx = dev->data;
	uint32_t ctl = 0;

	if (en) {
	ctl = LAN865x_MAC_NCR_TXEN \| LAN865x_MAC_NCR_RXEN;
	}

	return oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_NCR, ctl);
	}

	static int lan865x_enable_sync(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	uint32_t val;
	int ret;

	ret = oa_tc6_reg_read(ctx->tc6, OA_CONFIG0, &val);
	if (ret) {
	return ret;
	}
	val \|= OA_CONFIG0_SYNC \| OA_CONFIG0_RFA_ZARFE;
	ret = oa_tc6_reg_write(ctx->tc6, OA_CONFIG0, val);
	if (ret) {
	return ret;
	}

	return lan865x_mac_rxtx_control(dev, LAN865x_MAC_TXRX_ON);
	}

	static void lan865x_iface_init(struct net_if *iface)
	{
	const struct device *dev = net_if_get_device(iface);
	struct lan865x_data *ctx = dev->data;
	int ret;

	ret = lan865x_enable_sync(dev);
	if (ret) {
	LOG_ERR("LAN865x sync enable failed: %d\n", ret);
	return;
	}

	net_if_set_link_addr(iface, ctx->mac_address, sizeof(ctx->mac_address), NET_LINK_ETHERNET);

	if (ctx->iface == NULL) {
	ctx->iface = iface;
	}

	ethernet_init(iface);

	net_eth_carrier_on(iface);
	ctx->iface_initialized = true;
	}

	static enum ethernet_hw_caps lan865x_port_get_capabilities(const struct device *dev)
	{
	ARG_UNUSED(dev);
	return ETHERNET_LINK_10BASE \| ETHERNET_PROMISC_MODE;
	}

	static int lan865x_gpio_reset(const struct device *dev);
	static void lan865x_write_macaddress(const struct device *dev);
	static int lan865x_set_config(const struct device *dev, enum ethernet_config_type type,
	const struct ethernet_config *config)
	{
	const struct lan865x_config *cfg = dev->config;
	struct lan865x_data *ctx = dev->data;
	struct phy_plca_cfg plca_cfg;

	if (type == ETHERNET_CONFIG_TYPE_PROMISC_MODE) {
	return oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_NCFGR, LAN865x_MAC_NCFGR_CAF);
	}

	if (type == ETHERNET_CONFIG_TYPE_MAC_ADDRESS) {
	memcpy(ctx->mac_address, config->mac_address.addr, sizeof(ctx->mac_address));

	lan865x_write_macaddress(dev);

	return net_if_set_link_addr(ctx->iface, ctx->mac_address, sizeof(ctx->mac_address),
	NET_LINK_ETHERNET);
	}

	if (type == ETHERNET_CONFIG_TYPE_T1S_PARAM) {
	if (config->t1s_param.type == ETHERNET_T1S_PARAM_TYPE_PLCA_CONFIG) {
	plca_cfg.enable = config->t1s_param.plca.enable;
	plca_cfg.node_id = config->t1s_param.plca.node_id;
	plca_cfg.node_count = config->t1s_param.plca.node_count;
	plca_cfg.burst_count = config->t1s_param.plca.burst_count;
	plca_cfg.burst_timer = config->t1s_param.plca.burst_timer;
	plca_cfg.to_timer = config->t1s_param.plca.to_timer;

	return phy_set_plca_cfg(cfg->phy, &plca_cfg);
	}
	}

	return -ENOTSUP;
	}

	static int lan865x_wait_for_reset(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	uint8_t i;

	/* Wait for end of LAN865x reset */
	for (i = 0; !ctx->reset && i < LAN865X_RESET_TIMEOUT; i++) {
	k_msleep(1);
	}

	if (i == LAN865X_RESET_TIMEOUT) {
	LOG_ERR("LAN865x reset timeout reached!");
	return -ENODEV;
	}

	return 0;
	}

	static int lan865x_gpio_reset(const struct device *dev)
	{
	const struct lan865x_config *cfg = dev->config;
	struct lan865x_data *ctx = dev->data;

	ctx->reset = false;
	ctx->tc6->protected = false;

	/* Perform (GPIO based) HW reset */
	/* assert RESET_N low for 10 µs (5 µs min) */
	gpio_pin_set_dt(&cfg->reset, 1);
	k_busy_wait(10U);
	/* deassert - end of reset indicated by IRQ_N low */
	gpio_pin_set_dt(&cfg->reset, 0);

	return lan865x_wait_for_reset(dev);
	}

	static int lan865x_check_spi(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	uint32_t val;
	int ret;

	ret = oa_tc6_reg_read(ctx->tc6, LAN865x_DEVID, &val);
	if (ret < 0) {
	return -ENODEV;
	}

	ctx->silicon_rev = val & LAN865X_REV_MASK;
	if (ctx->silicon_rev != 1 && ctx->silicon_rev != 2) {
	return -ENODEV;
	}

	ctx->chip_id = (val >> 4) & 0xFFFF;
	if (ctx->chip_id != LAN8650_DEVID && ctx->chip_id != LAN8651_DEVID) {
	return -ENODEV;
	}

	return ret;
	}

	static void lan865x_write_macaddress(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	uint8_t *mac = &ctx->mac_address[0];
	uint32_t val;

	/* SPEC_ADD2_BOTTOM */
	val = (mac[3] << 24) \| (mac[2] << 16) \| (mac[1] << 8) \| mac[0];
	oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_SAB2, val);

	/* SPEC_ADD2_TOP */
	val = (mac[5] << 8) \| mac[4];
	oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_SAT2, val);

	/*
	* SPEC_ADD1_BOTTOM - setting unique lower MAC address, back off time is
	* generated out of it.
	*/
	val = (mac[5] << 24) \| (mac[4] << 16) \| (mac[3] << 8) \| mac[2];
	oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_SAB1, val);
	}

	static int lan865x_set_specific_multicast_addr(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	uint32_t mac_h_hash = 0xffffffff;
	uint32_t mac_l_hash = 0xffffffff;
	int ret;

	/* Enable hash for all multicast addresses */
	ret = oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_HRT, mac_h_hash);
	if (ret) {
	return ret;
	}

	ret = oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_HRB, mac_l_hash);
	if (ret) {
	return ret;
	}

	return oa_tc6_reg_write(ctx->tc6, LAN865x_MAC_NCFGR, LAN865x_MAC_NCFGR_MTIHEN);
	}

	static int lan865x_default_config(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	int ret;

	/* Enable protected control RW */
	oa_tc6_set_protected_ctrl(ctx->tc6, true);

	ret = oa_tc6_reg_write(ctx->tc6, LAN865X_FIXUP_REG, LAN865X_FIXUP_VALUE);
	if (ret) {
	return ret;
	}

	lan865x_write_macaddress(dev);
	lan865x_set_specific_multicast_addr(dev);

	return 0;
	}

	static void lan865x_int_callback(const struct device dev, struct gpio_callback cb, uint32_t pins)
	{
	ARG_UNUSED(dev);
	ARG_UNUSED(pins);

	struct lan865x_data *ctx = CONTAINER_OF(cb, struct lan865x_data, gpio_int_callback);

	k_sem_give(&ctx->int_sem);
	}

	static void lan865x_read_chunks(const struct device *dev)
	{
	const struct lan865x_config *cfg = dev->config;
	struct lan865x_data *ctx = dev->data;
	struct oa_tc6 *tc6 = ctx->tc6;
	struct net_pkt *pkt;
	int ret;

	pkt = net_pkt_rx_alloc(K_MSEC(cfg->timeout));
	if (!pkt) {
	LOG_ERR("OA RX: Could not allocate packet!");
	return;
	}

	k_sem_take(&ctx->tx_rx_sem, K_FOREVER);
	ret = oa_tc6_read_chunks(tc6, pkt);
	if (ret < 0) {
	eth_stats_update_errors_rx(ctx->iface);
	net_pkt_unref(pkt);
	k_sem_give(&ctx->tx_rx_sem);
	return;
	}

	/* Feed buffer frame to IP stack */
	ret = net_recv_data(ctx->iface, pkt);
	if (ret < 0) {
	LOG_ERR("OA RX: Could not process packet (%d)!", ret);
	net_pkt_unref(pkt);
	}
	k_sem_give(&ctx->tx_rx_sem);
	}

	static void lan865x_int_thread(const struct device *dev)
	{
	struct lan865x_data *ctx = dev->data;
	struct oa_tc6 *tc6 = ctx->tc6;
	uint32_t sts, ftr;
	int ret;

	while (true) {
	k_sem_take(&ctx->int_sem, K_FOREVER);
	if (!ctx->reset) {
	oa_tc6_reg_read(tc6, OA_STATUS0, &sts);
	if (sts & OA_STATUS0_RESETC) {
	oa_tc6_reg_write(tc6, OA_STATUS0, sts);

	lan865x_default_config(dev);

	ctx->reset = true;
	/*
	* According to OA T1S standard - it is mandatory to
	* read chunk of data to get the IRQ_N negated (deasserted).
	*/
	oa_tc6_read_status(tc6, &ftr);
	continue;
	}
	}

	/*
	* The IRQ_N is asserted when RCA becomes > 0. As described in
	* OPEN Alliance 10BASE-T1x standard it is deasserted when first
	* data header is received by LAN865x.
	*
	* Hence, it is mandatory to ALWAYS read at least one data chunk!
	*/
	do {
	lan865x_read_chunks(dev);
	} while (tc6->rca > 0);

	ret = oa_tc6_check_status(tc6);
	if (ret == -EIO) {
	lan865x_gpio_reset(dev);
	}
	}
	}

	static int lan865x_init(const struct device *dev)
	{
	const struct lan865x_config *cfg = dev->config;
	struct lan865x_data *ctx = dev->data;
	int ret;

	__ASSERT(cfg->spi.config.frequency <= LAN865X_SPI_MAX_FREQUENCY,
	"SPI frequency exceeds supported maximum\n");

	if (!spi_is_ready_dt(&cfg->spi)) {
	LOG_ERR("SPI bus %s not ready", cfg->spi.bus->name);
	return -ENODEV;
	}

	if (!gpio_is_ready_dt(&cfg->interrupt)) {
	LOG_ERR("Interrupt GPIO device %s is not ready", cfg->interrupt.port->name);
	return -ENODEV;
	}

	/* Check SPI communication after reset */
	ret = lan865x_check_spi(dev);
	if (ret < 0) {
	LOG_ERR("SPI communication not working, %d", ret);
	return ret;
	}

	/*
	* Configure interrupt service routine for LAN865x IRQ
	*/
	ret = gpio_pin_configure_dt(&cfg->interrupt, GPIO_INPUT);
	if (ret < 0) {
	LOG_ERR("Failed to configure interrupt GPIO, %d", ret);
	return ret;
	}

	gpio_init_callback(&(ctx->gpio_int_callback), lan865x_int_callback,
	BIT(cfg->interrupt.pin));

	ret = gpio_add_callback(cfg->interrupt.port, &ctx->gpio_int_callback);
	if (ret < 0) {
	LOG_ERR("Failed to add INT callback, %d", ret);
	return ret;
	}

	gpio_pin_interrupt_configure_dt(&cfg->interrupt, GPIO_INT_EDGE_TO_ACTIVE);

	/* Start interruption-poll thread */
	ctx->tid_int = k_thread_create(
	&ctx->thread, ctx->thread_stack, CONFIG_ETH_LAN865X_IRQ_THREAD_STACK_SIZE,
	(k_thread_entry_t)lan865x_int_thread, (void *)dev, NULL, NULL,
	K_PRIO_COOP(CONFIG_ETH_LAN865X_IRQ_THREAD_PRIO), 0, K_NO_WAIT);
	k_thread_name_set(ctx->tid_int, "lan865x_interrupt");

	/* Perform HW reset - 'rst-gpios' required property set in DT */
	if (!gpio_is_ready_dt(&cfg->reset)) {
	LOG_ERR("Reset GPIO device %s is not ready", cfg->reset.port->name);
	return -ENODEV;
	}

	ret = gpio_pin_configure_dt(&cfg->reset, GPIO_OUTPUT_INACTIVE);
	if (ret < 0) {
	LOG_ERR("Failed to configure reset GPIO, %d", ret);
	return ret;
	}

	return lan865x_gpio_reset(dev);
	}

	static int lan865x_port_send(const struct device dev, struct net_pkt pkt)
	{
	struct lan865x_data *ctx = dev->data;
	struct oa_tc6 *tc6 = ctx->tc6;
	int ret;

	k_sem_take(&ctx->tx_rx_sem, K_FOREVER);
	ret = oa_tc6_send_chunks(tc6, pkt);

	/* Check if rca > 0 during half-duplex TX transmission */
	if (tc6->rca > 0) {
	k_sem_give(&ctx->int_sem);
	}

	k_sem_give(&ctx->tx_rx_sem);
	if (ret < 0) {
	LOG_ERR("TX transmission error, %d", ret);
	eth_stats_update_errors_tx(net_pkt_iface(pkt));
	return ret;
	}

	return 0;
	}

	const struct device lan865x_get_phy(const struct device dev)
	{
	const struct lan865x_config *cfg = dev->config;

	return cfg->phy;
	}

	static const struct ethernet_api lan865x_api_func = {
	.iface_api.init = lan865x_iface_init,
	.get_capabilities = lan865x_port_get_capabilities,
	.set_config = lan865x_set_config,
	.send = lan865x_port_send,
	.get_phy = lan865x_get_phy,
	};

	#define LAN865X_DEFINE(inst) \
	static const struct lan865x_config lan865x_config_##inst = { \
	.spi = SPI_DT_SPEC_INST_GET(inst, SPI_WORD_SET(8)), \
	.interrupt = GPIO_DT_SPEC_INST_GET(inst, int_gpios), \
	.reset = GPIO_DT_SPEC_INST_GET(inst, rst_gpios), \
	.timeout = CONFIG_ETH_LAN865X_TIMEOUT, \
	.phy = DEVICE_DT_GET( \
	DT_CHILD(DT_INST_CHILD(inst, lan865x_mdio), ethernet_phy_##inst))}; \
	\
	struct oa_tc6 oa_tc6_##inst = { \
	.cps = 64, .protected = 0, .spi = &lan865x_config_##inst.spi}; \
	static struct lan865x_data lan865x_data_##inst = { \
	.mac_address = DT_INST_PROP_OR(inst, local_mac_address, {0}), \
	.tx_rx_sem = Z_SEM_INITIALIZER((lan865x_data_##inst).tx_rx_sem, 1, 1), \
	.int_sem = Z_SEM_INITIALIZER((lan865x_data_##inst).int_sem, 0, 1), \
	.tc6 = &oa_tc6_##inst}; \
	\
	ETH_NET_DEVICE_DT_INST_DEFINE(inst, lan865x_init, NULL, &lan865x_data_##inst, \
	&lan865x_config_##inst, CONFIG_ETH_LAN865X_INIT_PRIORITY, \
	&lan865x_api_func, NET_ETH_MTU);

	DT_INST_FOREACH_STATUS_OKAY(LAN865X_DEFINE);