drivers/net/dsa/mv88e6xxx/global1.c - kernel/msm-4.19 - Gitiles

 /*
  * Marvell 88E6xxx Switch Global (1) Registers support
  *
  * Copyright (c) 2008 Marvell Semiconductor
  *
  * Copyright (c) 2016-2017 Savoir-faire Linux Inc.
  *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */

 #include "mv88e6xxx.h"
 #include "global1.h"

 int mv88e6xxx_g1_read(struct mv88e6xxx_chip *chip, int reg, u16 *val)
 {
 	int addr = chip->info->global1_addr;

 	return mv88e6xxx_read(chip, addr, reg, val);
 }

 int mv88e6xxx_g1_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
 {
 	int addr = chip->info->global1_addr;

 	return mv88e6xxx_write(chip, addr, reg, val);
 }

 int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
 {
 	return mv88e6xxx_wait(chip, chip->info->global1_addr, reg, mask);
 }

 /* Offset 0x00: Switch Global Status Register */

 static int mv88e6185_g1_wait_ppu_disabled(struct mv88e6xxx_chip *chip)
 {
 	u16 state;
 	int i, err;

 	for (i = 0; i < 16; i++) {
 		err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
 		if (err)
 			return err;

 		/* Check the value of the PPUState bits 15:14 */
 		state &= GLOBAL_STATUS_PPU_STATE_MASK;
 		if (state != GLOBAL_STATUS_PPU_STATE_POLLING)
 			return 0;

 		usleep_range(1000, 2000);
 	}

 	return -ETIMEDOUT;
 }

 static int mv88e6185_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
 {
 	u16 state;
 	int i, err;

 	for (i = 0; i < 16; ++i) {
 		err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
 		if (err)
 			return err;

 		/* Check the value of the PPUState bits 15:14 */
 		state &= GLOBAL_STATUS_PPU_STATE_MASK;
 		if (state == GLOBAL_STATUS_PPU_STATE_POLLING)
 			return 0;

 		usleep_range(1000, 2000);
 	}

 	return -ETIMEDOUT;
 }

 static int mv88e6352_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
 {
 	u16 state;
 	int i, err;

 	for (i = 0; i < 16; ++i) {
 		err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
 		if (err)
 			return err;

 		/* Check the value of the PPUState (or InitState) bit 15 */
 		if (state & GLOBAL_STATUS_PPU_STATE)
 			return 0;

 		usleep_range(1000, 2000);
 	}

 	return -ETIMEDOUT;
 }

 static int mv88e6xxx_g1_wait_init_ready(struct mv88e6xxx_chip *chip)
 {
 	const unsigned long timeout = jiffies + 1 * HZ;
 	u16 val;
 	int err;

 	/* Wait up to 1 second for the switch to be ready. The InitReady bit 11
 	 * is set to a one when all units inside the device (ATU, VTU, etc.)
 	 * have finished their initialization and are ready to accept frames.
 	 */
 	while (time_before(jiffies, timeout)) {
 		err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &val);
 		if (err)
 			return err;

 		if (val & GLOBAL_STATUS_INIT_READY)
 			break;

 		usleep_range(1000, 2000);
 	}

 	if (time_after(jiffies, timeout))
 		return -ETIMEDOUT;

 	return 0;
 }

 /* Offset 0x04: Switch Global Control Register */

 int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip)
 {
 	u16 val;
 	int err;

 	/* Set the SWReset bit 15 along with the PPUEn bit 14, to also restart
 	 * the PPU, including re-doing PHY detection and initialization
 	 */
 	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &val);
 	if (err)
 		return err;

 	val |= GLOBAL_CONTROL_SW_RESET;
 	val |= GLOBAL_CONTROL_PPU_ENABLE;

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

 	err = mv88e6xxx_g1_wait_init_ready(chip);
 	if (err)
 		return err;

 	return mv88e6185_g1_wait_ppu_polling(chip);
 }

 int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip)
 {
 	u16 val;
 	int err;

 	/* Set the SWReset bit 15 */
 	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &val);
 	if (err)
 		return err;

 	val |= GLOBAL_CONTROL_SW_RESET;

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

 	err = mv88e6xxx_g1_wait_init_ready(chip);
 	if (err)
 		return err;

 	return mv88e6352_g1_wait_ppu_polling(chip);
 }

 int mv88e6185_g1_ppu_enable(struct mv88e6xxx_chip *chip)
 {
 	u16 val;
 	int err;

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

 	val |= GLOBAL_CONTROL_PPU_ENABLE;

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

 	return mv88e6185_g1_wait_ppu_polling(chip);
 }

 int mv88e6185_g1_ppu_disable(struct mv88e6xxx_chip *chip)
 {
 	u16 val;
 	int err;

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

 	val &= ~GLOBAL_CONTROL_PPU_ENABLE;

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

 	return mv88e6185_g1_wait_ppu_disabled(chip);
 }

 /* Offset 0x1a: Monitor Control */
 /* Offset 0x1a: Monitor & MGMT Control on some devices */

 int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
 {
 	u16 reg;
 	int err;

 	err = mv88e6xxx_g1_read(chip, GLOBAL_MONITOR_CONTROL, &reg);
 	if (err)
 		return err;

 	reg &= ~(GLOBAL_MONITOR_CONTROL_INGRESS_MASK |
 		 GLOBAL_MONITOR_CONTROL_EGRESS_MASK);

 	reg |= port << GLOBAL_MONITOR_CONTROL_INGRESS_SHIFT |
 		port << GLOBAL_MONITOR_CONTROL_EGRESS_SHIFT;

 	return mv88e6xxx_g1_write(chip, GLOBAL_MONITOR_CONTROL, reg);
 }

 /* Older generations also call this the ARP destination. It has been
  * generalized in more modern devices such that more than ARP can
  * egress it
  */
 int mv88e6095_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
 {
 	u16 reg;
 	int err;

 	err = mv88e6xxx_g1_read(chip, GLOBAL_MONITOR_CONTROL, &reg);
 	if (err)
 		return err;

 	reg &= ~GLOBAL_MONITOR_CONTROL_ARP_MASK;
 	reg |= port << GLOBAL_MONITOR_CONTROL_ARP_SHIFT;

 	return mv88e6xxx_g1_write(chip, GLOBAL_MONITOR_CONTROL, reg);
 }

 static int mv88e6390_g1_monitor_write(struct mv88e6xxx_chip *chip,
 				      u16 pointer, u8 data)
 {
 	u16 reg;

 	reg = GLOBAL_MONITOR_CONTROL_UPDATE | pointer | data;

 	return mv88e6xxx_g1_write(chip, GLOBAL_MONITOR_CONTROL, reg);
 }

 int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
 {
 	int err;

 	err = mv88e6390_g1_monitor_write(chip, GLOBAL_MONITOR_CONTROL_INGRESS,
 					 port);
 	if (err)
 		return err;

 	return mv88e6390_g1_monitor_write(chip, GLOBAL_MONITOR_CONTROL_EGRESS,
 					  port);
 }

 int mv88e6390_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
 {
 	return mv88e6390_g1_monitor_write(chip, GLOBAL_MONITOR_CONTROL_CPU_DEST,
 					  port);
 }

 int mv88e6390_g1_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip)
 {
 	int err;

 	/* 01:c2:80:00:00:00:00-01:c2:80:00:00:00:07 are Management */
 	err = mv88e6390_g1_monitor_write(
 		chip, GLOBAL_MONITOR_CONTROL_0180C280000000XLO, 0xff);
 	if (err)
 		return err;

 	/* 01:c2:80:00:00:00:08-01:c2:80:00:00:00:0f are Management */
 	err = mv88e6390_g1_monitor_write(
 		chip, GLOBAL_MONITOR_CONTROL_0180C280000000XHI, 0xff);
 	if (err)
 		return err;

 	/* 01:c2:80:00:00:00:20-01:c2:80:00:00:00:27 are Management */
 	err = mv88e6390_g1_monitor_write(
 		chip, GLOBAL_MONITOR_CONTROL_0180C280000002XLO, 0xff);
 	if (err)
 		return err;

 	/* 01:c2:80:00:00:00:28-01:c2:80:00:00:00:2f are Management */
 	return mv88e6390_g1_monitor_write(
 		chip, GLOBAL_MONITOR_CONTROL_0180C280000002XHI, 0xff);
 }

 /* Offset 0x1c: Global Control 2 */

 int mv88e6390_g1_stats_set_histogram(struct mv88e6xxx_chip *chip)
 {
 	u16 val;
 	int err;

 	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL_2, &val);
 	if (err)
 		return err;

 	val |= GLOBAL_CONTROL_2_HIST_RX_TX;

 	err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL_2, val);

 	return err;
 }

 /* Offset 0x1d: Statistics Operation 2 */

 int mv88e6xxx_g1_stats_wait(struct mv88e6xxx_chip *chip)
 {
 	return mv88e6xxx_g1_wait(chip, GLOBAL_STATS_OP, GLOBAL_STATS_OP_BUSY);
 }

 int mv88e6xxx_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
 {
 	int err;

 	/* Snapshot the hardware statistics counters for this port. */
 	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
 				 GLOBAL_STATS_OP_CAPTURE_PORT |
 				 GLOBAL_STATS_OP_HIST_RX_TX | port);
 	if (err)
 		return err;

 	/* Wait for the snapshotting to complete. */
 	return mv88e6xxx_g1_stats_wait(chip);
 }

 int mv88e6320_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
 {
 	port = (port + 1) << 5;

 	return mv88e6xxx_g1_stats_snapshot(chip, port);
 }

 int mv88e6390_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
 {
 	int err;

 	port = (port + 1) << 5;

 	/* Snapshot the hardware statistics counters for this port. */
 	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
 				 GLOBAL_STATS_OP_CAPTURE_PORT | port);
 	if (err)
 		return err;

 	/* Wait for the snapshotting to complete. */
 	return mv88e6xxx_g1_stats_wait(chip);
 }

 void mv88e6xxx_g1_stats_read(struct mv88e6xxx_chip *chip, int stat, u32 *val)
 {
 	u32 value;
 	u16 reg;
 	int err;

 	*val = 0;

 	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
 				 GLOBAL_STATS_OP_READ_CAPTURED | stat);
 	if (err)
 		return;

 	err = mv88e6xxx_g1_stats_wait(chip);
 	if (err)
 		return;

 	err = mv88e6xxx_g1_read(chip, GLOBAL_STATS_COUNTER_32, &reg);
 	if (err)
 		return;

 	value = reg << 16;

 	err = mv88e6xxx_g1_read(chip, GLOBAL_STATS_COUNTER_01, &reg);
 	if (err)
 		return;

 	*val = value | reg;
 }
	/*
	* Marvell 88E6xxx Switch Global (1) Registers support
	*
	* Copyright (c) 2008 Marvell Semiconductor
	*
	* Copyright (c) 2016-2017 Savoir-faire Linux Inc.
	* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*/

	#include "mv88e6xxx.h"
	#include "global1.h"

	int mv88e6xxx_g1_read(struct mv88e6xxx_chip chip, int reg, u16 val)
	{
	int addr = chip->info->global1_addr;

	return mv88e6xxx_read(chip, addr, reg, val);
	}

	int mv88e6xxx_g1_write(struct mv88e6xxx_chip *chip, int reg, u16 val)
	{
	int addr = chip->info->global1_addr;

	return mv88e6xxx_write(chip, addr, reg, val);
	}

	int mv88e6xxx_g1_wait(struct mv88e6xxx_chip *chip, int reg, u16 mask)
	{
	return mv88e6xxx_wait(chip, chip->info->global1_addr, reg, mask);
	}

	/* Offset 0x00: Switch Global Status Register */

	static int mv88e6185_g1_wait_ppu_disabled(struct mv88e6xxx_chip *chip)
	{
	u16 state;
	int i, err;

	for (i = 0; i < 16; i++) {
	err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
	if (err)
	return err;

	/* Check the value of the PPUState bits 15:14 */
	state &= GLOBAL_STATUS_PPU_STATE_MASK;
	if (state != GLOBAL_STATUS_PPU_STATE_POLLING)
	return 0;

	usleep_range(1000, 2000);
	}

	return -ETIMEDOUT;
	}

	static int mv88e6185_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
	{
	u16 state;
	int i, err;

	for (i = 0; i < 16; ++i) {
	err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
	if (err)
	return err;

	/* Check the value of the PPUState bits 15:14 */
	state &= GLOBAL_STATUS_PPU_STATE_MASK;
	if (state == GLOBAL_STATUS_PPU_STATE_POLLING)
	return 0;

	usleep_range(1000, 2000);
	}

	return -ETIMEDOUT;
	}

	static int mv88e6352_g1_wait_ppu_polling(struct mv88e6xxx_chip *chip)
	{
	u16 state;
	int i, err;

	for (i = 0; i < 16; ++i) {
	err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &state);
	if (err)
	return err;

	/* Check the value of the PPUState (or InitState) bit 15 */
	if (state & GLOBAL_STATUS_PPU_STATE)
	return 0;

	usleep_range(1000, 2000);
	}

	return -ETIMEDOUT;
	}

	static int mv88e6xxx_g1_wait_init_ready(struct mv88e6xxx_chip *chip)
	{
	const unsigned long timeout = jiffies + 1 * HZ;
	u16 val;
	int err;

	/* Wait up to 1 second for the switch to be ready. The InitReady bit 11
	* is set to a one when all units inside the device (ATU, VTU, etc.)
	* have finished their initialization and are ready to accept frames.
	*/
	while (time_before(jiffies, timeout)) {
	err = mv88e6xxx_g1_read(chip, GLOBAL_STATUS, &val);
	if (err)
	return err;

	if (val & GLOBAL_STATUS_INIT_READY)
	break;

	usleep_range(1000, 2000);
	}

	if (time_after(jiffies, timeout))
	return -ETIMEDOUT;

	return 0;
	}

	/* Offset 0x04: Switch Global Control Register */

	int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip)
	{
	u16 val;
	int err;

	/* Set the SWReset bit 15 along with the PPUEn bit 14, to also restart
	* the PPU, including re-doing PHY detection and initialization
	*/
	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &val);
	if (err)
	return err;

	val \|= GLOBAL_CONTROL_SW_RESET;
	val \|= GLOBAL_CONTROL_PPU_ENABLE;

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

	err = mv88e6xxx_g1_wait_init_ready(chip);
	if (err)
	return err;

	return mv88e6185_g1_wait_ppu_polling(chip);
	}

	int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip)
	{
	u16 val;
	int err;

	/* Set the SWReset bit 15 */
	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL, &val);
	if (err)
	return err;

	val \|= GLOBAL_CONTROL_SW_RESET;

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

	err = mv88e6xxx_g1_wait_init_ready(chip);
	if (err)
	return err;

	return mv88e6352_g1_wait_ppu_polling(chip);
	}

	int mv88e6185_g1_ppu_enable(struct mv88e6xxx_chip *chip)
	{
	u16 val;
	int err;

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

	val \|= GLOBAL_CONTROL_PPU_ENABLE;

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

	return mv88e6185_g1_wait_ppu_polling(chip);
	}

	int mv88e6185_g1_ppu_disable(struct mv88e6xxx_chip *chip)
	{
	u16 val;
	int err;

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

	val &= ~GLOBAL_CONTROL_PPU_ENABLE;

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

	return mv88e6185_g1_wait_ppu_disabled(chip);
	}

	/* Offset 0x1a: Monitor Control */
	/* Offset 0x1a: Monitor & MGMT Control on some devices */

	int mv88e6095_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
	{
	u16 reg;
	int err;

	err = mv88e6xxx_g1_read(chip, GLOBAL_MONITOR_CONTROL, &reg);
	if (err)
	return err;

	reg &= ~(GLOBAL_MONITOR_CONTROL_INGRESS_MASK \|
	GLOBAL_MONITOR_CONTROL_EGRESS_MASK);

	reg \|= port << GLOBAL_MONITOR_CONTROL_INGRESS_SHIFT \|
	port << GLOBAL_MONITOR_CONTROL_EGRESS_SHIFT;

	return mv88e6xxx_g1_write(chip, GLOBAL_MONITOR_CONTROL, reg);
	}

	/* Older generations also call this the ARP destination. It has been
	* generalized in more modern devices such that more than ARP can
	* egress it
	*/
	int mv88e6095_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
	{
	u16 reg;
	int err;

	err = mv88e6xxx_g1_read(chip, GLOBAL_MONITOR_CONTROL, &reg);
	if (err)
	return err;

	reg &= ~GLOBAL_MONITOR_CONTROL_ARP_MASK;
	reg \|= port << GLOBAL_MONITOR_CONTROL_ARP_SHIFT;

	return mv88e6xxx_g1_write(chip, GLOBAL_MONITOR_CONTROL, reg);
	}

	static int mv88e6390_g1_monitor_write(struct mv88e6xxx_chip *chip,
	u16 pointer, u8 data)
	{
	u16 reg;

	reg = GLOBAL_MONITOR_CONTROL_UPDATE \| pointer \| data;

	return mv88e6xxx_g1_write(chip, GLOBAL_MONITOR_CONTROL, reg);
	}

	int mv88e6390_g1_set_egress_port(struct mv88e6xxx_chip *chip, int port)
	{
	int err;

	err = mv88e6390_g1_monitor_write(chip, GLOBAL_MONITOR_CONTROL_INGRESS,
	port);
	if (err)
	return err;

	return mv88e6390_g1_monitor_write(chip, GLOBAL_MONITOR_CONTROL_EGRESS,
	port);
	}

	int mv88e6390_g1_set_cpu_port(struct mv88e6xxx_chip *chip, int port)
	{
	return mv88e6390_g1_monitor_write(chip, GLOBAL_MONITOR_CONTROL_CPU_DEST,
	port);
	}

	int mv88e6390_g1_mgmt_rsvd2cpu(struct mv88e6xxx_chip *chip)
	{
	int err;

	/* 01:c2:80:00:00:00:00-01:c2:80:00:00:00:07 are Management */
	err = mv88e6390_g1_monitor_write(
	chip, GLOBAL_MONITOR_CONTROL_0180C280000000XLO, 0xff);
	if (err)
	return err;

	/* 01:c2:80:00:00:00:08-01:c2:80:00:00:00:0f are Management */
	err = mv88e6390_g1_monitor_write(
	chip, GLOBAL_MONITOR_CONTROL_0180C280000000XHI, 0xff);
	if (err)
	return err;

	/* 01:c2:80:00:00:00:20-01:c2:80:00:00:00:27 are Management */
	err = mv88e6390_g1_monitor_write(
	chip, GLOBAL_MONITOR_CONTROL_0180C280000002XLO, 0xff);
	if (err)
	return err;

	/* 01:c2:80:00:00:00:28-01:c2:80:00:00:00:2f are Management */
	return mv88e6390_g1_monitor_write(
	chip, GLOBAL_MONITOR_CONTROL_0180C280000002XHI, 0xff);
	}

	/* Offset 0x1c: Global Control 2 */

	int mv88e6390_g1_stats_set_histogram(struct mv88e6xxx_chip *chip)
	{
	u16 val;
	int err;

	err = mv88e6xxx_g1_read(chip, GLOBAL_CONTROL_2, &val);
	if (err)
	return err;

	val \|= GLOBAL_CONTROL_2_HIST_RX_TX;

	err = mv88e6xxx_g1_write(chip, GLOBAL_CONTROL_2, val);

	return err;
	}

	/* Offset 0x1d: Statistics Operation 2 */

	int mv88e6xxx_g1_stats_wait(struct mv88e6xxx_chip *chip)
	{
	return mv88e6xxx_g1_wait(chip, GLOBAL_STATS_OP, GLOBAL_STATS_OP_BUSY);
	}

	int mv88e6xxx_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
	{
	int err;

	/* Snapshot the hardware statistics counters for this port. */
	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
	GLOBAL_STATS_OP_CAPTURE_PORT \|
	GLOBAL_STATS_OP_HIST_RX_TX \| port);
	if (err)
	return err;

	/* Wait for the snapshotting to complete. */
	return mv88e6xxx_g1_stats_wait(chip);
	}

	int mv88e6320_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
	{
	port = (port + 1) << 5;

	return mv88e6xxx_g1_stats_snapshot(chip, port);
	}

	int mv88e6390_g1_stats_snapshot(struct mv88e6xxx_chip *chip, int port)
	{
	int err;

	port = (port + 1) << 5;

	/* Snapshot the hardware statistics counters for this port. */
	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
	GLOBAL_STATS_OP_CAPTURE_PORT \| port);
	if (err)
	return err;

	/* Wait for the snapshotting to complete. */
	return mv88e6xxx_g1_stats_wait(chip);
	}

	void mv88e6xxx_g1_stats_read(struct mv88e6xxx_chip chip, int stat, u32 val)
	{
	u32 value;
	u16 reg;
	int err;

	*val = 0;

	err = mv88e6xxx_g1_write(chip, GLOBAL_STATS_OP,
	GLOBAL_STATS_OP_READ_CAPTURED \| stat);
	if (err)
	return;

	err = mv88e6xxx_g1_stats_wait(chip);
	if (err)
	return;

	err = mv88e6xxx_g1_read(chip, GLOBAL_STATS_COUNTER_32, &reg);
	if (err)
	return;

	value = reg << 16;

	err = mv88e6xxx_g1_read(chip, GLOBAL_STATS_COUNTER_01, &reg);
	if (err)
	return;

	*val = value \| reg;
	}