drivers/net/dsa/mv88e6xxx/global1_atu.c - SHIFTPHONES/mainline/linux - Gitiles

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Marvell 88E6xxx Address Translation Unit (ATU) support
  *
  * Copyright (c) 2008 Marvell Semiconductor
  * Copyright (c) 2017 Savoir-faire Linux, Inc.
  */
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>

 #include "chip.h"
 #include "global1.h"

 /* Offset 0x01: ATU FID Register */

 static int mv88e6xxx_g1_atu_fid_write(struct mv88e6xxx_chip *chip, u16 fid)
 {
 	return mv88e6xxx_g1_write(chip, MV88E6352_G1_ATU_FID, fid & 0xfff);
 }

 /* Offset 0x0A: ATU Control Register */

 int mv88e6xxx_g1_atu_set_learn2all(struct mv88e6xxx_chip *chip, bool learn2all)
 {
 	u16 val;
 	int err;

 	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
 	if (err)
 		return err;

 	if (learn2all)
 		val |= MV88E6XXX_G1_ATU_CTL_LEARN2ALL;
 	else
 		val &= ~MV88E6XXX_G1_ATU_CTL_LEARN2ALL;

 	return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
 }

 int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip,
 				  unsigned int msecs)
 {
 	const unsigned int coeff = chip->info->age_time_coeff;
 	const unsigned int min = 0x01 * coeff;
 	const unsigned int max = 0xff * coeff;
 	u8 age_time;
 	u16 val;
 	int err;

 	if (msecs < min || msecs > max)
 		return -ERANGE;

 	/* Round to nearest multiple of coeff */
 	age_time = (msecs + coeff / 2) / coeff;

 	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
 	if (err)
 		return err;

 	/* AgeTime is 11:4 bits */
 	val &= ~0xff0;
 	val |= age_time << 4;

 	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
 	if (err)
 		return err;

 	dev_dbg(chip->dev, "AgeTime set to 0x%02x (%d ms)\n", age_time,
 		age_time * coeff);

 	return 0;
 }

 /* Offset 0x0B: ATU Operation Register */

 static int mv88e6xxx_g1_atu_op_wait(struct mv88e6xxx_chip *chip)
 {
 	return mv88e6xxx_g1_wait(chip, MV88E6XXX_G1_ATU_OP,
 				 MV88E6XXX_G1_ATU_OP_BUSY);
 }

 static int mv88e6xxx_g1_atu_op(struct mv88e6xxx_chip *chip, u16 fid, u16 op)
 {
 	u16 val;
 	int err;

 	/* FID bits are dispatched all around gradually as more are supported */
 	if (mv88e6xxx_num_databases(chip) > 256) {
 		err = mv88e6xxx_g1_atu_fid_write(chip, fid);
 		if (err)
 			return err;
 	} else {
 		if (mv88e6xxx_num_databases(chip) > 16) {
 			/* ATU DBNum[7:4] are located in ATU Control 15:12 */
 			err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL,
 						&val);
 			if (err)
 				return err;

 			val = (val & 0x0fff) | ((fid << 8) & 0xf000);
 			err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL,
 						 val);
 			if (err)
 				return err;
 		}

 		/* ATU DBNum[3:0] are located in ATU Operation 3:0 */
 		op |= fid & 0xf;
 	}

 	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_OP,
 				 MV88E6XXX_G1_ATU_OP_BUSY | op);
 	if (err)
 		return err;

 	return mv88e6xxx_g1_atu_op_wait(chip);
 }

 /* Offset 0x0C: ATU Data Register */

 static int mv88e6xxx_g1_atu_data_read(struct mv88e6xxx_chip *chip,
 				      struct mv88e6xxx_atu_entry *entry)
 {
 	u16 val;
 	int err;

 	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_DATA, &val);
 	if (err)
 		return err;

 	entry->state = val & 0xf;
 	if (entry->state != MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
 		entry->trunk = !!(val & MV88E6XXX_G1_ATU_DATA_TRUNK);
 		entry->portvec = (val >> 4) & mv88e6xxx_port_mask(chip);
 	}

 	return 0;
 }

 static int mv88e6xxx_g1_atu_data_write(struct mv88e6xxx_chip *chip,
 				       struct mv88e6xxx_atu_entry *entry)
 {
 	u16 data = entry->state & 0xf;

 	if (entry->state != MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
 		if (entry->trunk)
 			data |= MV88E6XXX_G1_ATU_DATA_TRUNK;

 		data |= (entry->portvec & mv88e6xxx_port_mask(chip)) << 4;
 	}

 	return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_DATA, data);
 }

 /* Offset 0x0D: ATU MAC Address Register Bytes 0 & 1
  * Offset 0x0E: ATU MAC Address Register Bytes 2 & 3
  * Offset 0x0F: ATU MAC Address Register Bytes 4 & 5
  */

 static int mv88e6xxx_g1_atu_mac_read(struct mv88e6xxx_chip *chip,
 				     struct mv88e6xxx_atu_entry *entry)
 {
 	u16 val;
 	int i, err;

 	for (i = 0; i < 3; i++) {
 		err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_MAC01 + i, &val);
 		if (err)
 			return err;

 		entry->mac[i * 2] = val >> 8;
 		entry->mac[i * 2 + 1] = val & 0xff;
 	}

 	return 0;
 }

 static int mv88e6xxx_g1_atu_mac_write(struct mv88e6xxx_chip *chip,
 				      struct mv88e6xxx_atu_entry *entry)
 {
 	u16 val;
 	int i, err;

 	for (i = 0; i < 3; i++) {
 		val = (entry->mac[i * 2] << 8) | entry->mac[i * 2 + 1];
 		err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_MAC01 + i, val);
 		if (err)
 			return err;
 	}

 	return 0;
 }

 /* Address Translation Unit operations */

 int mv88e6xxx_g1_atu_getnext(struct mv88e6xxx_chip *chip, u16 fid,
 			     struct mv88e6xxx_atu_entry *entry)
 {
 	int err;

 	err = mv88e6xxx_g1_atu_op_wait(chip);
 	if (err)
 		return err;

 	/* Write the MAC address to iterate from only once */
 	if (entry->state == MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
 		err = mv88e6xxx_g1_atu_mac_write(chip, entry);
 		if (err)
 			return err;
 	}

 	err = mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_GET_NEXT_DB);
 	if (err)
 		return err;

 	err = mv88e6xxx_g1_atu_data_read(chip, entry);
 	if (err)
 		return err;

 	return mv88e6xxx_g1_atu_mac_read(chip, entry);
 }

 int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
 			       struct mv88e6xxx_atu_entry *entry)
 {
 	int err;

 	err = mv88e6xxx_g1_atu_op_wait(chip);
 	if (err)
 		return err;

 	err = mv88e6xxx_g1_atu_mac_write(chip, entry);
 	if (err)
 		return err;

 	err = mv88e6xxx_g1_atu_data_write(chip, entry);
 	if (err)
 		return err;

 	return mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_LOAD_DB);
 }

 static int mv88e6xxx_g1_atu_flushmove(struct mv88e6xxx_chip *chip, u16 fid,
 				      struct mv88e6xxx_atu_entry *entry,
 				      bool all)
 {
 	u16 op;
 	int err;

 	err = mv88e6xxx_g1_atu_op_wait(chip);
 	if (err)
 		return err;

 	err = mv88e6xxx_g1_atu_data_write(chip, entry);
 	if (err)
 		return err;

 	/* Flush/Move all or non-static entries from all or a given database */
 	if (all && fid)
 		op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL_DB;
 	else if (fid)
 		op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC_DB;
 	else if (all)
 		op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL;
 	else
 		op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC;

 	return mv88e6xxx_g1_atu_op(chip, fid, op);
 }

 int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all)
 {
 	struct mv88e6xxx_atu_entry entry = {
 		.state = 0, /* Null EntryState means Flush */
 	};

 	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
 }

 static int mv88e6xxx_g1_atu_move(struct mv88e6xxx_chip *chip, u16 fid,
 				 int from_port, int to_port, bool all)
 {
 	struct mv88e6xxx_atu_entry entry = { 0 };
 	unsigned long mask;
 	int shift;

 	if (!chip->info->atu_move_port_mask)
 		return -EOPNOTSUPP;

 	mask = chip->info->atu_move_port_mask;
 	shift = bitmap_weight(&mask, 16);

 	entry.state = 0xf, /* Full EntryState means Move */
 	entry.portvec = from_port & mask;
 	entry.portvec |= (to_port & mask) << shift;

 	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
 }

 int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
 			    bool all)
 {
 	int from_port = port;
 	int to_port = chip->info->atu_move_port_mask;

 	return mv88e6xxx_g1_atu_move(chip, fid, from_port, to_port, all);
 }

 static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
 {
 	struct mv88e6xxx_chip *chip = dev_id;
 	struct mv88e6xxx_atu_entry entry;
 	int spid;
 	int err;
 	u16 val;

 	mutex_lock(&chip->reg_lock);

 	err = mv88e6xxx_g1_atu_op(chip, 0,
 				  MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION);
 	if (err)
 		goto out;

 	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_OP, &val);
 	if (err)
 		goto out;

 	err = mv88e6xxx_g1_atu_data_read(chip, &entry);
 	if (err)
 		goto out;

 	err = mv88e6xxx_g1_atu_mac_read(chip, &entry);
 	if (err)
 		goto out;

 	spid = entry.state;

 	if (val & MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION) {
 		dev_err_ratelimited(chip->dev,
 				    "ATU age out violation for %pM\n",
 				    entry.mac);
 	}

 	if (val & MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION) {
 		dev_err_ratelimited(chip->dev,
 				    "ATU member violation for %pM portvec %x spid %d\n",
 				    entry.mac, entry.portvec, spid);
 		chip->ports[spid].atu_member_violation++;
 	}

 	if (val & MV88E6XXX_G1_ATU_OP_MISS_VIOLATION) {
 		dev_err_ratelimited(chip->dev,
 				    "ATU miss violation for %pM portvec %x spid %d\n",
 				    entry.mac, entry.portvec, spid);
 		chip->ports[spid].atu_miss_violation++;
 	}

 	if (val & MV88E6XXX_G1_ATU_OP_FULL_VIOLATION) {
 		dev_err_ratelimited(chip->dev,
 				    "ATU full violation for %pM portvec %x spid %d\n",
 				    entry.mac, entry.portvec, spid);
 		chip->ports[spid].atu_full_violation++;
 	}
 	mutex_unlock(&chip->reg_lock);

 	return IRQ_HANDLED;

 out:
 	mutex_unlock(&chip->reg_lock);

 	dev_err(chip->dev, "ATU problem: error %d while handling interrupt\n",
 		err);
 	return IRQ_HANDLED;
 }

 int mv88e6xxx_g1_atu_prob_irq_setup(struct mv88e6xxx_chip *chip)
 {
 	int err;

 	chip->atu_prob_irq = irq_find_mapping(chip->g1_irq.domain,
 					      MV88E6XXX_G1_STS_IRQ_ATU_PROB);
 	if (chip->atu_prob_irq < 0)
 		return chip->atu_prob_irq;

 	err = request_threaded_irq(chip->atu_prob_irq, NULL,
 				   mv88e6xxx_g1_atu_prob_irq_thread_fn,
 				   IRQF_ONESHOT, "mv88e6xxx-g1-atu-prob",
 				   chip);
 	if (err)
 		irq_dispose_mapping(chip->atu_prob_irq);

 	return err;
 }

 void mv88e6xxx_g1_atu_prob_irq_free(struct mv88e6xxx_chip *chip)
 {
 	free_irq(chip->atu_prob_irq, chip);
 	irq_dispose_mapping(chip->atu_prob_irq);
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Marvell 88E6xxx Address Translation Unit (ATU) support
	*
	* Copyright (c) 2008 Marvell Semiconductor
	* Copyright (c) 2017 Savoir-faire Linux, Inc.
	*/
	#include <linux/interrupt.h>
	#include <linux/irqdomain.h>

	#include "chip.h"
	#include "global1.h"

	/* Offset 0x01: ATU FID Register */

	static int mv88e6xxx_g1_atu_fid_write(struct mv88e6xxx_chip *chip, u16 fid)
	{
	return mv88e6xxx_g1_write(chip, MV88E6352_G1_ATU_FID, fid & 0xfff);
	}

	/* Offset 0x0A: ATU Control Register */

	int mv88e6xxx_g1_atu_set_learn2all(struct mv88e6xxx_chip *chip, bool learn2all)
	{
	u16 val;
	int err;

	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
	if (err)
	return err;

	if (learn2all)
	val \|= MV88E6XXX_G1_ATU_CTL_LEARN2ALL;
	else
	val &= ~MV88E6XXX_G1_ATU_CTL_LEARN2ALL;

	return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
	}

	int mv88e6xxx_g1_atu_set_age_time(struct mv88e6xxx_chip *chip,
	unsigned int msecs)
	{
	const unsigned int coeff = chip->info->age_time_coeff;
	const unsigned int min = 0x01 * coeff;
	const unsigned int max = 0xff * coeff;
	u8 age_time;
	u16 val;
	int err;

	if (msecs < min \|\| msecs > max)
	return -ERANGE;

	/* Round to nearest multiple of coeff */
	age_time = (msecs + coeff / 2) / coeff;

	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL, &val);
	if (err)
	return err;

	/* AgeTime is 11:4 bits */
	val &= ~0xff0;
	val \|= age_time << 4;

	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL, val);
	if (err)
	return err;

	dev_dbg(chip->dev, "AgeTime set to 0x%02x (%d ms)\n", age_time,
	age_time * coeff);

	return 0;
	}

	/* Offset 0x0B: ATU Operation Register */

	static int mv88e6xxx_g1_atu_op_wait(struct mv88e6xxx_chip *chip)
	{
	return mv88e6xxx_g1_wait(chip, MV88E6XXX_G1_ATU_OP,
	MV88E6XXX_G1_ATU_OP_BUSY);
	}

	static int mv88e6xxx_g1_atu_op(struct mv88e6xxx_chip *chip, u16 fid, u16 op)
	{
	u16 val;
	int err;

	/* FID bits are dispatched all around gradually as more are supported */
	if (mv88e6xxx_num_databases(chip) > 256) {
	err = mv88e6xxx_g1_atu_fid_write(chip, fid);
	if (err)
	return err;
	} else {
	if (mv88e6xxx_num_databases(chip) > 16) {
	/* ATU DBNum[7:4] are located in ATU Control 15:12 */
	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_CTL,
	&val);
	if (err)
	return err;

	val = (val & 0x0fff) \| ((fid << 8) & 0xf000);
	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_CTL,
	val);
	if (err)
	return err;
	}

	/* ATU DBNum[3:0] are located in ATU Operation 3:0 */
	op \|= fid & 0xf;
	}

	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_OP,
	MV88E6XXX_G1_ATU_OP_BUSY \| op);
	if (err)
	return err;

	return mv88e6xxx_g1_atu_op_wait(chip);
	}

	/* Offset 0x0C: ATU Data Register */

	static int mv88e6xxx_g1_atu_data_read(struct mv88e6xxx_chip *chip,
	struct mv88e6xxx_atu_entry *entry)
	{
	u16 val;
	int err;

	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_DATA, &val);
	if (err)
	return err;

	entry->state = val & 0xf;
	if (entry->state != MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
	entry->trunk = !!(val & MV88E6XXX_G1_ATU_DATA_TRUNK);
	entry->portvec = (val >> 4) & mv88e6xxx_port_mask(chip);
	}

	return 0;
	}

	static int mv88e6xxx_g1_atu_data_write(struct mv88e6xxx_chip *chip,
	struct mv88e6xxx_atu_entry *entry)
	{
	u16 data = entry->state & 0xf;

	if (entry->state != MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
	if (entry->trunk)
	data \|= MV88E6XXX_G1_ATU_DATA_TRUNK;

	data \|= (entry->portvec & mv88e6xxx_port_mask(chip)) << 4;
	}

	return mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_DATA, data);
	}

	/* Offset 0x0D: ATU MAC Address Register Bytes 0 & 1
	* Offset 0x0E: ATU MAC Address Register Bytes 2 & 3
	* Offset 0x0F: ATU MAC Address Register Bytes 4 & 5
	*/

	static int mv88e6xxx_g1_atu_mac_read(struct mv88e6xxx_chip *chip,
	struct mv88e6xxx_atu_entry *entry)
	{
	u16 val;
	int i, err;

	for (i = 0; i < 3; i++) {
	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_MAC01 + i, &val);
	if (err)
	return err;

	entry->mac[i * 2] = val >> 8;
	entry->mac[i * 2 + 1] = val & 0xff;
	}

	return 0;
	}

	static int mv88e6xxx_g1_atu_mac_write(struct mv88e6xxx_chip *chip,
	struct mv88e6xxx_atu_entry *entry)
	{
	u16 val;
	int i, err;

	for (i = 0; i < 3; i++) {
	val = (entry->mac[i * 2] << 8) \| entry->mac[i * 2 + 1];
	err = mv88e6xxx_g1_write(chip, MV88E6XXX_G1_ATU_MAC01 + i, val);
	if (err)
	return err;
	}

	return 0;
	}

	/* Address Translation Unit operations */

	int mv88e6xxx_g1_atu_getnext(struct mv88e6xxx_chip *chip, u16 fid,
	struct mv88e6xxx_atu_entry *entry)
	{
	int err;

	err = mv88e6xxx_g1_atu_op_wait(chip);
	if (err)
	return err;

	/* Write the MAC address to iterate from only once */
	if (entry->state == MV88E6XXX_G1_ATU_DATA_STATE_UNUSED) {
	err = mv88e6xxx_g1_atu_mac_write(chip, entry);
	if (err)
	return err;
	}

	err = mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_GET_NEXT_DB);
	if (err)
	return err;

	err = mv88e6xxx_g1_atu_data_read(chip, entry);
	if (err)
	return err;

	return mv88e6xxx_g1_atu_mac_read(chip, entry);
	}

	int mv88e6xxx_g1_atu_loadpurge(struct mv88e6xxx_chip *chip, u16 fid,
	struct mv88e6xxx_atu_entry *entry)
	{
	int err;

	err = mv88e6xxx_g1_atu_op_wait(chip);
	if (err)
	return err;

	err = mv88e6xxx_g1_atu_mac_write(chip, entry);
	if (err)
	return err;

	err = mv88e6xxx_g1_atu_data_write(chip, entry);
	if (err)
	return err;

	return mv88e6xxx_g1_atu_op(chip, fid, MV88E6XXX_G1_ATU_OP_LOAD_DB);
	}

	static int mv88e6xxx_g1_atu_flushmove(struct mv88e6xxx_chip *chip, u16 fid,
	struct mv88e6xxx_atu_entry *entry,
	bool all)
	{
	u16 op;
	int err;

	err = mv88e6xxx_g1_atu_op_wait(chip);
	if (err)
	return err;

	err = mv88e6xxx_g1_atu_data_write(chip, entry);
	if (err)
	return err;

	/* Flush/Move all or non-static entries from all or a given database */
	if (all && fid)
	op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL_DB;
	else if (fid)
	op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC_DB;
	else if (all)
	op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_ALL;
	else
	op = MV88E6XXX_G1_ATU_OP_FLUSH_MOVE_NON_STATIC;

	return mv88e6xxx_g1_atu_op(chip, fid, op);
	}

	int mv88e6xxx_g1_atu_flush(struct mv88e6xxx_chip *chip, u16 fid, bool all)
	{
	struct mv88e6xxx_atu_entry entry = {
	.state = 0, /* Null EntryState means Flush */
	};

	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
	}

	static int mv88e6xxx_g1_atu_move(struct mv88e6xxx_chip *chip, u16 fid,
	int from_port, int to_port, bool all)
	{
	struct mv88e6xxx_atu_entry entry = { 0 };
	unsigned long mask;
	int shift;

	if (!chip->info->atu_move_port_mask)
	return -EOPNOTSUPP;

	mask = chip->info->atu_move_port_mask;
	shift = bitmap_weight(&mask, 16);

	entry.state = 0xf, /* Full EntryState means Move */
	entry.portvec = from_port & mask;
	entry.portvec \|= (to_port & mask) << shift;

	return mv88e6xxx_g1_atu_flushmove(chip, fid, &entry, all);
	}

	int mv88e6xxx_g1_atu_remove(struct mv88e6xxx_chip *chip, u16 fid, int port,
	bool all)
	{
	int from_port = port;
	int to_port = chip->info->atu_move_port_mask;

	return mv88e6xxx_g1_atu_move(chip, fid, from_port, to_port, all);
	}

	static irqreturn_t mv88e6xxx_g1_atu_prob_irq_thread_fn(int irq, void *dev_id)
	{
	struct mv88e6xxx_chip *chip = dev_id;
	struct mv88e6xxx_atu_entry entry;
	int spid;
	int err;
	u16 val;

	mutex_lock(&chip->reg_lock);

	err = mv88e6xxx_g1_atu_op(chip, 0,
	MV88E6XXX_G1_ATU_OP_GET_CLR_VIOLATION);
	if (err)
	goto out;

	err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_ATU_OP, &val);
	if (err)
	goto out;

	err = mv88e6xxx_g1_atu_data_read(chip, &entry);
	if (err)
	goto out;

	err = mv88e6xxx_g1_atu_mac_read(chip, &entry);
	if (err)
	goto out;

	spid = entry.state;

	if (val & MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION) {
	dev_err_ratelimited(chip->dev,
	"ATU age out violation for %pM\n",
	entry.mac);
	}

	if (val & MV88E6XXX_G1_ATU_OP_MEMBER_VIOLATION) {
	dev_err_ratelimited(chip->dev,
	"ATU member violation for %pM portvec %x spid %d\n",
	entry.mac, entry.portvec, spid);
	chip->ports[spid].atu_member_violation++;
	}

	if (val & MV88E6XXX_G1_ATU_OP_MISS_VIOLATION) {
	dev_err_ratelimited(chip->dev,
	"ATU miss violation for %pM portvec %x spid %d\n",
	entry.mac, entry.portvec, spid);
	chip->ports[spid].atu_miss_violation++;
	}

	if (val & MV88E6XXX_G1_ATU_OP_FULL_VIOLATION) {
	dev_err_ratelimited(chip->dev,
	"ATU full violation for %pM portvec %x spid %d\n",
	entry.mac, entry.portvec, spid);
	chip->ports[spid].atu_full_violation++;
	}
	mutex_unlock(&chip->reg_lock);

	return IRQ_HANDLED;

	out:
	mutex_unlock(&chip->reg_lock);

	dev_err(chip->dev, "ATU problem: error %d while handling interrupt\n",
	err);
	return IRQ_HANDLED;
	}

	int mv88e6xxx_g1_atu_prob_irq_setup(struct mv88e6xxx_chip *chip)
	{
	int err;

	chip->atu_prob_irq = irq_find_mapping(chip->g1_irq.domain,
	MV88E6XXX_G1_STS_IRQ_ATU_PROB);
	if (chip->atu_prob_irq < 0)
	return chip->atu_prob_irq;

	err = request_threaded_irq(chip->atu_prob_irq, NULL,
	mv88e6xxx_g1_atu_prob_irq_thread_fn,
	IRQF_ONESHOT, "mv88e6xxx-g1-atu-prob",
	chip);
	if (err)
	irq_dispose_mapping(chip->atu_prob_irq);

	return err;
	}

	void mv88e6xxx_g1_atu_prob_irq_free(struct mv88e6xxx_chip *chip)
	{
	free_irq(chip->atu_prob_irq, chip);
	irq_dispose_mapping(chip->atu_prob_irq);
	}