/*
 * net/dsa/mv88e6xxx.c - Marvell 88e6xxx switch chip support
 * Copyright (c) 2008 Marvell Semiconductor
 *
 * Copyright (c) 2015 CMC Electronics, Inc.
 *	Added support for VLAN Table Unit operations
 *
 * 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 <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_bridge.h>
#include <linux/jiffies.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <net/dsa.h>
#include <net/switchdev.h>
#include "mv88e6xxx.h"

static void assert_smi_lock(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	if (unlikely(!mutex_is_locked(&ps->smi_mutex))) {
		dev_err(ds->master_dev, "SMI lock not held!\n");
		dump_stack();
	}
}

/* If the switch's ADDR[4:0] strap pins are strapped to zero, it will
 * use all 32 SMI bus addresses on its SMI bus, and all switch registers
 * will be directly accessible on some {device address,register address}
 * pair.  If the ADDR[4:0] pins are not strapped to zero, the switch
 * will only respond to SMI transactions to that specific address, and
 * an indirect addressing mechanism needs to be used to access its
 * registers.
 */
static int mv88e6xxx_reg_wait_ready(struct mii_bus *bus, int sw_addr)
{
	int ret;
	int i;

	for (i = 0; i < 16; i++) {
		ret = mdiobus_read_nested(bus, sw_addr, SMI_CMD);
		if (ret < 0)
			return ret;

		if ((ret & SMI_CMD_BUSY) == 0)
			return 0;
	}

	return -ETIMEDOUT;
}

static int __mv88e6xxx_reg_read(struct mii_bus *bus, int sw_addr, int addr,
				int reg)
{
	int ret;

	if (sw_addr == 0)
		return mdiobus_read_nested(bus, addr, reg);

	/* Wait for the bus to become free. */
	ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
	if (ret < 0)
		return ret;

	/* Transmit the read command. */
	ret = mdiobus_write_nested(bus, sw_addr, SMI_CMD,
				   SMI_CMD_OP_22_READ | (addr << 5) | reg);
	if (ret < 0)
		return ret;

	/* Wait for the read command to complete. */
	ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
	if (ret < 0)
		return ret;

	/* Read the data. */
	ret = mdiobus_read_nested(bus, sw_addr, SMI_DATA);
	if (ret < 0)
		return ret;

	return ret & 0xffff;
}

static int _mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg)
{
	struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);
	int ret;

	assert_smi_lock(ds);

	if (bus == NULL)
		return -EINVAL;

	ret = __mv88e6xxx_reg_read(bus, ds->pd->sw_addr, addr, reg);
	if (ret < 0)
		return ret;

	dev_dbg(ds->master_dev, "<- addr: 0x%.2x reg: 0x%.2x val: 0x%.4x\n",
		addr, reg, ret);

	return ret;
}

int mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_reg_read(ds, addr, reg);
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

static int __mv88e6xxx_reg_write(struct mii_bus *bus, int sw_addr, int addr,
				 int reg, u16 val)
{
	int ret;

	if (sw_addr == 0)
		return mdiobus_write_nested(bus, addr, reg, val);

	/* Wait for the bus to become free. */
	ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
	if (ret < 0)
		return ret;

	/* Transmit the data to write. */
	ret = mdiobus_write_nested(bus, sw_addr, SMI_DATA, val);
	if (ret < 0)
		return ret;

	/* Transmit the write command. */
	ret = mdiobus_write_nested(bus, sw_addr, SMI_CMD,
				   SMI_CMD_OP_22_WRITE | (addr << 5) | reg);
	if (ret < 0)
		return ret;

	/* Wait for the write command to complete. */
	ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
	if (ret < 0)
		return ret;

	return 0;
}

static int _mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg,
				u16 val)
{
	struct mii_bus *bus = dsa_host_dev_to_mii_bus(ds->master_dev);

	assert_smi_lock(ds);

	if (bus == NULL)
		return -EINVAL;

	dev_dbg(ds->master_dev, "-> addr: 0x%.2x reg: 0x%.2x val: 0x%.4x\n",
		addr, reg, val);

	return __mv88e6xxx_reg_write(bus, ds->pd->sw_addr, addr, reg, val);
}

int mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_reg_write(ds, addr, reg, val);
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

int mv88e6xxx_set_addr_direct(struct dsa_switch *ds, u8 *addr)
{
	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_01, (addr[0] << 8) | addr[1]);
	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_23, (addr[2] << 8) | addr[3]);
	REG_WRITE(REG_GLOBAL, GLOBAL_MAC_45, (addr[4] << 8) | addr[5]);

	return 0;
}

int mv88e6xxx_set_addr_indirect(struct dsa_switch *ds, u8 *addr)
{
	int i;
	int ret;

	for (i = 0; i < 6; i++) {
		int j;

		/* Write the MAC address byte. */
		REG_WRITE(REG_GLOBAL2, GLOBAL2_SWITCH_MAC,
			  GLOBAL2_SWITCH_MAC_BUSY | (i << 8) | addr[i]);

		/* Wait for the write to complete. */
		for (j = 0; j < 16; j++) {
			ret = REG_READ(REG_GLOBAL2, GLOBAL2_SWITCH_MAC);
			if ((ret & GLOBAL2_SWITCH_MAC_BUSY) == 0)
				break;
		}
		if (j == 16)
			return -ETIMEDOUT;
	}

	return 0;
}

static int _mv88e6xxx_phy_read(struct dsa_switch *ds, int addr, int regnum)
{
	if (addr >= 0)
		return _mv88e6xxx_reg_read(ds, addr, regnum);
	return 0xffff;
}

static int _mv88e6xxx_phy_write(struct dsa_switch *ds, int addr, int regnum,
				u16 val)
{
	if (addr >= 0)
		return _mv88e6xxx_reg_write(ds, addr, regnum, val);
	return 0;
}

#ifdef CONFIG_NET_DSA_MV88E6XXX_NEED_PPU
static int mv88e6xxx_ppu_disable(struct dsa_switch *ds)
{
	int ret;
	unsigned long timeout;

	ret = REG_READ(REG_GLOBAL, GLOBAL_CONTROL);
	REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL,
		  ret & ~GLOBAL_CONTROL_PPU_ENABLE);

	timeout = jiffies + 1 * HZ;
	while (time_before(jiffies, timeout)) {
		ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
		usleep_range(1000, 2000);
		if ((ret & GLOBAL_STATUS_PPU_MASK) !=
		    GLOBAL_STATUS_PPU_POLLING)
			return 0;
	}

	return -ETIMEDOUT;
}

static int mv88e6xxx_ppu_enable(struct dsa_switch *ds)
{
	int ret;
	unsigned long timeout;

	ret = REG_READ(REG_GLOBAL, GLOBAL_CONTROL);
	REG_WRITE(REG_GLOBAL, GLOBAL_CONTROL, ret | GLOBAL_CONTROL_PPU_ENABLE);

	timeout = jiffies + 1 * HZ;
	while (time_before(jiffies, timeout)) {
		ret = REG_READ(REG_GLOBAL, GLOBAL_STATUS);
		usleep_range(1000, 2000);
		if ((ret & GLOBAL_STATUS_PPU_MASK) ==
		    GLOBAL_STATUS_PPU_POLLING)
			return 0;
	}

	return -ETIMEDOUT;
}

static void mv88e6xxx_ppu_reenable_work(struct work_struct *ugly)
{
	struct mv88e6xxx_priv_state *ps;

	ps = container_of(ugly, struct mv88e6xxx_priv_state, ppu_work);
	if (mutex_trylock(&ps->ppu_mutex)) {
		struct dsa_switch *ds = ((struct dsa_switch *)ps) - 1;

		if (mv88e6xxx_ppu_enable(ds) == 0)
			ps->ppu_disabled = 0;
		mutex_unlock(&ps->ppu_mutex);
	}
}

static void mv88e6xxx_ppu_reenable_timer(unsigned long _ps)
{
	struct mv88e6xxx_priv_state *ps = (void *)_ps;

	schedule_work(&ps->ppu_work);
}

static int mv88e6xxx_ppu_access_get(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->ppu_mutex);

	/* If the PHY polling unit is enabled, disable it so that
	 * we can access the PHY registers.  If it was already
	 * disabled, cancel the timer that is going to re-enable
	 * it.
	 */
	if (!ps->ppu_disabled) {
		ret = mv88e6xxx_ppu_disable(ds);
		if (ret < 0) {
			mutex_unlock(&ps->ppu_mutex);
			return ret;
		}
		ps->ppu_disabled = 1;
	} else {
		del_timer(&ps->ppu_timer);
		ret = 0;
	}

	return ret;
}

static void mv88e6xxx_ppu_access_put(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	/* Schedule a timer to re-enable the PHY polling unit. */
	mod_timer(&ps->ppu_timer, jiffies + msecs_to_jiffies(10));
	mutex_unlock(&ps->ppu_mutex);
}

void mv88e6xxx_ppu_state_init(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	mutex_init(&ps->ppu_mutex);
	INIT_WORK(&ps->ppu_work, mv88e6xxx_ppu_reenable_work);
	init_timer(&ps->ppu_timer);
	ps->ppu_timer.data = (unsigned long)ps;
	ps->ppu_timer.function = mv88e6xxx_ppu_reenable_timer;
}

int mv88e6xxx_phy_read_ppu(struct dsa_switch *ds, int addr, int regnum)
{
	int ret;

	ret = mv88e6xxx_ppu_access_get(ds);
	if (ret >= 0) {
		ret = mv88e6xxx_reg_read(ds, addr, regnum);
		mv88e6xxx_ppu_access_put(ds);
	}

	return ret;
}

int mv88e6xxx_phy_write_ppu(struct dsa_switch *ds, int addr,
			    int regnum, u16 val)
{
	int ret;

	ret = mv88e6xxx_ppu_access_get(ds);
	if (ret >= 0) {
		ret = mv88e6xxx_reg_write(ds, addr, regnum, val);
		mv88e6xxx_ppu_access_put(ds);
	}

	return ret;
}
#endif

static bool mv88e6xxx_6065_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6031:
	case PORT_SWITCH_ID_6061:
	case PORT_SWITCH_ID_6035:
	case PORT_SWITCH_ID_6065:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6095_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6092:
	case PORT_SWITCH_ID_6095:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6097_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6046:
	case PORT_SWITCH_ID_6085:
	case PORT_SWITCH_ID_6096:
	case PORT_SWITCH_ID_6097:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6165_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6123:
	case PORT_SWITCH_ID_6161:
	case PORT_SWITCH_ID_6165:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6185_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6121:
	case PORT_SWITCH_ID_6122:
	case PORT_SWITCH_ID_6152:
	case PORT_SWITCH_ID_6155:
	case PORT_SWITCH_ID_6182:
	case PORT_SWITCH_ID_6185:
	case PORT_SWITCH_ID_6108:
	case PORT_SWITCH_ID_6131:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6320_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6320:
	case PORT_SWITCH_ID_6321:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6351_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6171:
	case PORT_SWITCH_ID_6175:
	case PORT_SWITCH_ID_6350:
	case PORT_SWITCH_ID_6351:
		return true;
	}
	return false;
}

static bool mv88e6xxx_6352_family(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6172:
	case PORT_SWITCH_ID_6176:
	case PORT_SWITCH_ID_6240:
	case PORT_SWITCH_ID_6352:
		return true;
	}
	return false;
}

/* We expect the switch to perform auto negotiation if there is a real
 * phy. However, in the case of a fixed link phy, we force the port
 * settings from the fixed link settings.
 */
void mv88e6xxx_adjust_link(struct dsa_switch *ds, int port,
			   struct phy_device *phydev)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	u32 reg;
	int ret;

	if (!phy_is_pseudo_fixed_link(phydev))
		return;

	mutex_lock(&ps->smi_mutex);

	ret = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_PCS_CTRL);
	if (ret < 0)
		goto out;

	reg = ret & ~(PORT_PCS_CTRL_LINK_UP |
		      PORT_PCS_CTRL_FORCE_LINK |
		      PORT_PCS_CTRL_DUPLEX_FULL |
		      PORT_PCS_CTRL_FORCE_DUPLEX |
		      PORT_PCS_CTRL_UNFORCED);

	reg |= PORT_PCS_CTRL_FORCE_LINK;
	if (phydev->link)
			reg |= PORT_PCS_CTRL_LINK_UP;

	if (mv88e6xxx_6065_family(ds) && phydev->speed > SPEED_100)
		goto out;

	switch (phydev->speed) {
	case SPEED_1000:
		reg |= PORT_PCS_CTRL_1000;
		break;
	case SPEED_100:
		reg |= PORT_PCS_CTRL_100;
		break;
	case SPEED_10:
		reg |= PORT_PCS_CTRL_10;
		break;
	default:
		pr_info("Unknown speed");
		goto out;
	}

	reg |= PORT_PCS_CTRL_FORCE_DUPLEX;
	if (phydev->duplex == DUPLEX_FULL)
		reg |= PORT_PCS_CTRL_DUPLEX_FULL;

	if ((mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds)) &&
	    (port >= ps->num_ports - 2)) {
		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
			reg |= PORT_PCS_CTRL_RGMII_DELAY_RXCLK;
		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
			reg |= PORT_PCS_CTRL_RGMII_DELAY_TXCLK;
		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
			reg |= (PORT_PCS_CTRL_RGMII_DELAY_RXCLK |
				PORT_PCS_CTRL_RGMII_DELAY_TXCLK);
	}
	_mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_PCS_CTRL, reg);

out:
	mutex_unlock(&ps->smi_mutex);
}

static int _mv88e6xxx_stats_wait(struct dsa_switch *ds)
{
	int ret;
	int i;

	for (i = 0; i < 10; i++) {
		ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_STATS_OP);
		if ((ret & GLOBAL_STATS_OP_BUSY) == 0)
			return 0;
	}

	return -ETIMEDOUT;
}

static int _mv88e6xxx_stats_snapshot(struct dsa_switch *ds, int port)
{
	int ret;

	if (mv88e6xxx_6320_family(ds) || mv88e6xxx_6352_family(ds))
		port = (port + 1) << 5;

	/* Snapshot the hardware statistics counters for this port. */
	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_STATS_OP,
				   GLOBAL_STATS_OP_CAPTURE_PORT |
				   GLOBAL_STATS_OP_HIST_RX_TX | port);
	if (ret < 0)
		return ret;

	/* Wait for the snapshotting to complete. */
	ret = _mv88e6xxx_stats_wait(ds);
	if (ret < 0)
		return ret;

	return 0;
}

static void _mv88e6xxx_stats_read(struct dsa_switch *ds, int stat, u32 *val)
{
	u32 _val;
	int ret;

	*val = 0;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_STATS_OP,
				   GLOBAL_STATS_OP_READ_CAPTURED |
				   GLOBAL_STATS_OP_HIST_RX_TX | stat);
	if (ret < 0)
		return;

	ret = _mv88e6xxx_stats_wait(ds);
	if (ret < 0)
		return;

	ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_STATS_COUNTER_32);
	if (ret < 0)
		return;

	_val = ret << 16;

	ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_STATS_COUNTER_01);
	if (ret < 0)
		return;

	*val = _val | ret;
}

static struct mv88e6xxx_hw_stat mv88e6xxx_hw_stats[] = {
	{ "in_good_octets", 8, 0x00, },
	{ "in_bad_octets", 4, 0x02, },
	{ "in_unicast", 4, 0x04, },
	{ "in_broadcasts", 4, 0x06, },
	{ "in_multicasts", 4, 0x07, },
	{ "in_pause", 4, 0x16, },
	{ "in_undersize", 4, 0x18, },
	{ "in_fragments", 4, 0x19, },
	{ "in_oversize", 4, 0x1a, },
	{ "in_jabber", 4, 0x1b, },
	{ "in_rx_error", 4, 0x1c, },
	{ "in_fcs_error", 4, 0x1d, },
	{ "out_octets", 8, 0x0e, },
	{ "out_unicast", 4, 0x10, },
	{ "out_broadcasts", 4, 0x13, },
	{ "out_multicasts", 4, 0x12, },
	{ "out_pause", 4, 0x15, },
	{ "excessive", 4, 0x11, },
	{ "collisions", 4, 0x1e, },
	{ "deferred", 4, 0x05, },
	{ "single", 4, 0x14, },
	{ "multiple", 4, 0x17, },
	{ "out_fcs_error", 4, 0x03, },
	{ "late", 4, 0x1f, },
	{ "hist_64bytes", 4, 0x08, },
	{ "hist_65_127bytes", 4, 0x09, },
	{ "hist_128_255bytes", 4, 0x0a, },
	{ "hist_256_511bytes", 4, 0x0b, },
	{ "hist_512_1023bytes", 4, 0x0c, },
	{ "hist_1024_max_bytes", 4, 0x0d, },
	/* Not all devices have the following counters */
	{ "sw_in_discards", 4, 0x110, },
	{ "sw_in_filtered", 2, 0x112, },
	{ "sw_out_filtered", 2, 0x113, },

};

static bool have_sw_in_discards(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	switch (ps->id) {
	case PORT_SWITCH_ID_6095: case PORT_SWITCH_ID_6161:
	case PORT_SWITCH_ID_6165: case PORT_SWITCH_ID_6171:
	case PORT_SWITCH_ID_6172: case PORT_SWITCH_ID_6176:
	case PORT_SWITCH_ID_6182: case PORT_SWITCH_ID_6185:
	case PORT_SWITCH_ID_6352:
		return true;
	default:
		return false;
	}
}

static void _mv88e6xxx_get_strings(struct dsa_switch *ds,
				   int nr_stats,
				   struct mv88e6xxx_hw_stat *stats,
				   int port, uint8_t *data)
{
	int i;

	for (i = 0; i < nr_stats; i++) {
		memcpy(data + i * ETH_GSTRING_LEN,
		       stats[i].string, ETH_GSTRING_LEN);
	}
}

static uint64_t _mv88e6xxx_get_ethtool_stat(struct dsa_switch *ds,
					    int stat,
					    struct mv88e6xxx_hw_stat *stats,
					    int port)
{
	struct mv88e6xxx_hw_stat *s = stats + stat;
	u32 low;
	u32 high = 0;
	int ret;
	u64 value;

	if (s->reg >= 0x100) {
		ret = _mv88e6xxx_reg_read(ds, REG_PORT(port),
					  s->reg - 0x100);
		if (ret < 0)
			return UINT64_MAX;

		low = ret;
		if (s->sizeof_stat == 4) {
			ret = _mv88e6xxx_reg_read(ds, REG_PORT(port),
						  s->reg - 0x100 + 1);
			if (ret < 0)
				return UINT64_MAX;
			high = ret;
		}
	} else {
		_mv88e6xxx_stats_read(ds, s->reg, &low);
		if (s->sizeof_stat == 8)
			_mv88e6xxx_stats_read(ds, s->reg + 1, &high);
	}
	value = (((u64)high) << 16) | low;
	return value;
}

static void _mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
					 int nr_stats,
					 struct mv88e6xxx_hw_stat *stats,
					 int port, uint64_t *data)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;
	int i;

	mutex_lock(&ps->smi_mutex);

	ret = _mv88e6xxx_stats_snapshot(ds, port);
	if (ret < 0) {
		mutex_unlock(&ps->smi_mutex);
		return;
	}

	/* Read each of the counters. */
	for (i = 0; i < nr_stats; i++)
		data[i] = _mv88e6xxx_get_ethtool_stat(ds, i, stats, port);

	mutex_unlock(&ps->smi_mutex);
}

/* All the statistics in the table */
void
mv88e6xxx_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
{
	if (have_sw_in_discards(ds))
		_mv88e6xxx_get_strings(ds, ARRAY_SIZE(mv88e6xxx_hw_stats),
				       mv88e6xxx_hw_stats, port, data);
	else
		_mv88e6xxx_get_strings(ds, ARRAY_SIZE(mv88e6xxx_hw_stats) - 3,
				       mv88e6xxx_hw_stats, port, data);
}

int mv88e6xxx_get_sset_count(struct dsa_switch *ds)
{
	if (have_sw_in_discards(ds))
		return ARRAY_SIZE(mv88e6xxx_hw_stats);
	return ARRAY_SIZE(mv88e6xxx_hw_stats) - 3;
}

void
mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
			    int port, uint64_t *data)
{
	if (have_sw_in_discards(ds))
		_mv88e6xxx_get_ethtool_stats(
			ds, ARRAY_SIZE(mv88e6xxx_hw_stats),
			mv88e6xxx_hw_stats, port, data);
	else
		_mv88e6xxx_get_ethtool_stats(
			ds, ARRAY_SIZE(mv88e6xxx_hw_stats) - 3,
			mv88e6xxx_hw_stats, port, data);
}

int mv88e6xxx_get_regs_len(struct dsa_switch *ds, int port)
{
	return 32 * sizeof(u16);
}

void mv88e6xxx_get_regs(struct dsa_switch *ds, int port,
			struct ethtool_regs *regs, void *_p)
{
	u16 *p = _p;
	int i;

	regs->version = 0;

	memset(p, 0xff, 32 * sizeof(u16));

	for (i = 0; i < 32; i++) {
		int ret;

		ret = mv88e6xxx_reg_read(ds, REG_PORT(port), i);
		if (ret >= 0)
			p[i] = ret;
	}
}

static int _mv88e6xxx_wait(struct dsa_switch *ds, int reg, int offset,
			   u16 mask)
{
	unsigned long timeout = jiffies + HZ / 10;

	while (time_before(jiffies, timeout)) {
		int ret;

		ret = _mv88e6xxx_reg_read(ds, reg, offset);
		if (ret < 0)
			return ret;
		if (!(ret & mask))
			return 0;

		usleep_range(1000, 2000);
	}
	return -ETIMEDOUT;
}

static int mv88e6xxx_wait(struct dsa_switch *ds, int reg, int offset, u16 mask)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_wait(ds, reg, offset, mask);
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

static int _mv88e6xxx_phy_wait(struct dsa_switch *ds)
{
	return _mv88e6xxx_wait(ds, REG_GLOBAL2, GLOBAL2_SMI_OP,
			       GLOBAL2_SMI_OP_BUSY);
}

int mv88e6xxx_eeprom_load_wait(struct dsa_switch *ds)
{
	return mv88e6xxx_wait(ds, REG_GLOBAL2, GLOBAL2_EEPROM_OP,
			      GLOBAL2_EEPROM_OP_LOAD);
}

int mv88e6xxx_eeprom_busy_wait(struct dsa_switch *ds)
{
	return mv88e6xxx_wait(ds, REG_GLOBAL2, GLOBAL2_EEPROM_OP,
			      GLOBAL2_EEPROM_OP_BUSY);
}

static int _mv88e6xxx_atu_wait(struct dsa_switch *ds)
{
	return _mv88e6xxx_wait(ds, REG_GLOBAL, GLOBAL_ATU_OP,
			       GLOBAL_ATU_OP_BUSY);
}

static int _mv88e6xxx_phy_read_indirect(struct dsa_switch *ds, int addr,
					int regnum)
{
	int ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL2, GLOBAL2_SMI_OP,
				   GLOBAL2_SMI_OP_22_READ | (addr << 5) |
				   regnum);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_phy_wait(ds);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_reg_read(ds, REG_GLOBAL2, GLOBAL2_SMI_DATA);
}

static int _mv88e6xxx_phy_write_indirect(struct dsa_switch *ds, int addr,
					 int regnum, u16 val)
{
	int ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL2, GLOBAL2_SMI_DATA, val);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL2, GLOBAL2_SMI_OP,
				   GLOBAL2_SMI_OP_22_WRITE | (addr << 5) |
				   regnum);

	return _mv88e6xxx_phy_wait(ds);
}

int mv88e6xxx_get_eee(struct dsa_switch *ds, int port, struct ethtool_eee *e)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int reg;

	mutex_lock(&ps->smi_mutex);

	reg = _mv88e6xxx_phy_read_indirect(ds, port, 16);
	if (reg < 0)
		goto out;

	e->eee_enabled = !!(reg & 0x0200);
	e->tx_lpi_enabled = !!(reg & 0x0100);

	reg = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_STATUS);
	if (reg < 0)
		goto out;

	e->eee_active = !!(reg & PORT_STATUS_EEE);
	reg = 0;

out:
	mutex_unlock(&ps->smi_mutex);
	return reg;
}

int mv88e6xxx_set_eee(struct dsa_switch *ds, int port,
		      struct phy_device *phydev, struct ethtool_eee *e)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int reg;
	int ret;

	mutex_lock(&ps->smi_mutex);

	ret = _mv88e6xxx_phy_read_indirect(ds, port, 16);
	if (ret < 0)
		goto out;

	reg = ret & ~0x0300;
	if (e->eee_enabled)
		reg |= 0x0200;
	if (e->tx_lpi_enabled)
		reg |= 0x0100;

	ret = _mv88e6xxx_phy_write_indirect(ds, port, 16, reg);
out:
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

static int _mv88e6xxx_atu_cmd(struct dsa_switch *ds, u16 cmd)
{
	int ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_OP, cmd);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_atu_wait(ds);
}

static int _mv88e6xxx_atu_data_write(struct dsa_switch *ds,
				     struct mv88e6xxx_atu_entry *entry)
{
	u16 data = entry->state & GLOBAL_ATU_DATA_STATE_MASK;

	if (entry->state != GLOBAL_ATU_DATA_STATE_UNUSED) {
		unsigned int mask, shift;

		if (entry->trunk) {
			data |= GLOBAL_ATU_DATA_TRUNK;
			mask = GLOBAL_ATU_DATA_TRUNK_ID_MASK;
			shift = GLOBAL_ATU_DATA_TRUNK_ID_SHIFT;
		} else {
			mask = GLOBAL_ATU_DATA_PORT_VECTOR_MASK;
			shift = GLOBAL_ATU_DATA_PORT_VECTOR_SHIFT;
		}

		data |= (entry->portv_trunkid << shift) & mask;
	}

	return _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_DATA, data);
}

static int _mv88e6xxx_atu_flush_move(struct dsa_switch *ds,
				     struct mv88e6xxx_atu_entry *entry,
				     bool static_too)
{
	int op;
	int err;

	err = _mv88e6xxx_atu_wait(ds);
	if (err)
		return err;

	err = _mv88e6xxx_atu_data_write(ds, entry);
	if (err)
		return err;

	if (entry->fid) {
		err = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID,
					   entry->fid);
		if (err)
			return err;

		op = static_too ? GLOBAL_ATU_OP_FLUSH_MOVE_ALL_DB :
			GLOBAL_ATU_OP_FLUSH_MOVE_NON_STATIC_DB;
	} else {
		op = static_too ? GLOBAL_ATU_OP_FLUSH_MOVE_ALL :
			GLOBAL_ATU_OP_FLUSH_MOVE_NON_STATIC;
	}

	return _mv88e6xxx_atu_cmd(ds, op);
}

static int _mv88e6xxx_atu_flush(struct dsa_switch *ds, u16 fid, bool static_too)
{
	struct mv88e6xxx_atu_entry entry = {
		.fid = fid,
		.state = 0, /* EntryState bits must be 0 */
	};

	return _mv88e6xxx_atu_flush_move(ds, &entry, static_too);
}

static int _mv88e6xxx_atu_move(struct dsa_switch *ds, u16 fid, int from_port,
			       int to_port, bool static_too)
{
	struct mv88e6xxx_atu_entry entry = {
		.trunk = false,
		.fid = fid,
	};

	/* EntryState bits must be 0xF */
	entry.state = GLOBAL_ATU_DATA_STATE_MASK;

	/* ToPort and FromPort are respectively in PortVec bits 7:4 and 3:0 */
	entry.portv_trunkid = (to_port & 0x0f) << 4;
	entry.portv_trunkid |= from_port & 0x0f;

	return _mv88e6xxx_atu_flush_move(ds, &entry, static_too);
}

static int _mv88e6xxx_atu_remove(struct dsa_switch *ds, u16 fid, int port,
				 bool static_too)
{
	/* Destination port 0xF means remove the entries */
	return _mv88e6xxx_atu_move(ds, fid, port, 0x0f, static_too);
}

static int mv88e6xxx_set_port_state(struct dsa_switch *ds, int port, u8 state)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int reg, ret = 0;
	u8 oldstate;

	mutex_lock(&ps->smi_mutex);

	reg = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_CONTROL);
	if (reg < 0) {
		ret = reg;
		goto abort;
	}

	oldstate = reg & PORT_CONTROL_STATE_MASK;
	if (oldstate != state) {
		/* Flush forwarding database if we're moving a port
		 * from Learning or Forwarding state to Disabled or
		 * Blocking or Listening state.
		 */
		if (oldstate >= PORT_CONTROL_STATE_LEARNING &&
		    state <= PORT_CONTROL_STATE_BLOCKING) {
			ret = _mv88e6xxx_atu_remove(ds, 0, port, false);
			if (ret)
				goto abort;
		}
		reg = (reg & ~PORT_CONTROL_STATE_MASK) | state;
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_CONTROL,
					   reg);
	}

abort:
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

static int _mv88e6xxx_port_vlan_map_set(struct dsa_switch *ds, int port,
					u16 output_ports)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	const u16 mask = (1 << ps->num_ports) - 1;
	int reg;

	reg = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_BASE_VLAN);
	if (reg < 0)
		return reg;

	reg &= ~mask;
	reg |= output_ports & mask;

	return _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_BASE_VLAN, reg);
}

int mv88e6xxx_port_stp_update(struct dsa_switch *ds, int port, u8 state)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int stp_state;

	switch (state) {
	case BR_STATE_DISABLED:
		stp_state = PORT_CONTROL_STATE_DISABLED;
		break;
	case BR_STATE_BLOCKING:
	case BR_STATE_LISTENING:
		stp_state = PORT_CONTROL_STATE_BLOCKING;
		break;
	case BR_STATE_LEARNING:
		stp_state = PORT_CONTROL_STATE_LEARNING;
		break;
	case BR_STATE_FORWARDING:
	default:
		stp_state = PORT_CONTROL_STATE_FORWARDING;
		break;
	}

	netdev_dbg(ds->ports[port], "port state %d [%d]\n", state, stp_state);

	/* mv88e6xxx_port_stp_update may be called with softirqs disabled,
	 * so we can not update the port state directly but need to schedule it.
	 */
	ps->port_state[port] = stp_state;
	set_bit(port, &ps->port_state_update_mask);
	schedule_work(&ps->bridge_work);

	return 0;
}

static int _mv88e6xxx_port_pvid_get(struct dsa_switch *ds, int port, u16 *pvid)
{
	int ret;

	ret = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_DEFAULT_VLAN);
	if (ret < 0)
		return ret;

	*pvid = ret & PORT_DEFAULT_VLAN_MASK;

	return 0;
}

int mv88e6xxx_port_pvid_get(struct dsa_switch *ds, int port, u16 *pvid)
{
	int ret;

	ret = mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_DEFAULT_VLAN);
	if (ret < 0)
		return ret;

	*pvid = ret & PORT_DEFAULT_VLAN_MASK;

	return 0;
}

static int _mv88e6xxx_port_pvid_set(struct dsa_switch *ds, int port, u16 pvid)
{
	return _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_DEFAULT_VLAN,
				   pvid & PORT_DEFAULT_VLAN_MASK);
}

static int _mv88e6xxx_vtu_wait(struct dsa_switch *ds)
{
	return _mv88e6xxx_wait(ds, REG_GLOBAL, GLOBAL_VTU_OP,
			       GLOBAL_VTU_OP_BUSY);
}

static int _mv88e6xxx_vtu_cmd(struct dsa_switch *ds, u16 op)
{
	int ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_OP, op);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_vtu_wait(ds);
}

static int _mv88e6xxx_vtu_stu_flush(struct dsa_switch *ds)
{
	int ret;

	ret = _mv88e6xxx_vtu_wait(ds);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_vtu_cmd(ds, GLOBAL_VTU_OP_FLUSH_ALL);
}

static int _mv88e6xxx_vtu_stu_data_read(struct dsa_switch *ds,
					struct mv88e6xxx_vtu_stu_entry *entry,
					unsigned int nibble_offset)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	u16 regs[3];
	int i;
	int ret;

	for (i = 0; i < 3; ++i) {
		ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL,
					  GLOBAL_VTU_DATA_0_3 + i);
		if (ret < 0)
			return ret;

		regs[i] = ret;
	}

	for (i = 0; i < ps->num_ports; ++i) {
		unsigned int shift = (i % 4) * 4 + nibble_offset;
		u16 reg = regs[i / 4];

		entry->data[i] = (reg >> shift) & GLOBAL_VTU_STU_DATA_MASK;
	}

	return 0;
}

static int _mv88e6xxx_vtu_stu_data_write(struct dsa_switch *ds,
					 struct mv88e6xxx_vtu_stu_entry *entry,
					 unsigned int nibble_offset)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	u16 regs[3] = { 0 };
	int i;
	int ret;

	for (i = 0; i < ps->num_ports; ++i) {
		unsigned int shift = (i % 4) * 4 + nibble_offset;
		u8 data = entry->data[i];

		regs[i / 4] |= (data & GLOBAL_VTU_STU_DATA_MASK) << shift;
	}

	for (i = 0; i < 3; ++i) {
		ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL,
					   GLOBAL_VTU_DATA_0_3 + i, regs[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int _mv88e6xxx_vtu_vid_write(struct dsa_switch *ds, u16 vid)
{
	return _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_VID,
				    vid & GLOBAL_VTU_VID_MASK);
}

static int _mv88e6xxx_vtu_getnext(struct dsa_switch *ds,
				  struct mv88e6xxx_vtu_stu_entry *entry)
{
	struct mv88e6xxx_vtu_stu_entry next = { 0 };
	int ret;

	ret = _mv88e6xxx_vtu_wait(ds);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_vtu_cmd(ds, GLOBAL_VTU_OP_VTU_GET_NEXT);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_VTU_VID);
	if (ret < 0)
		return ret;

	next.vid = ret & GLOBAL_VTU_VID_MASK;
	next.valid = !!(ret & GLOBAL_VTU_VID_VALID);

	if (next.valid) {
		ret = _mv88e6xxx_vtu_stu_data_read(ds, &next, 0);
		if (ret < 0)
			return ret;

		if (mv88e6xxx_6097_family(ds) || mv88e6xxx_6165_family(ds) ||
		    mv88e6xxx_6351_family(ds) || mv88e6xxx_6352_family(ds)) {
			ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL,
						  GLOBAL_VTU_FID);
			if (ret < 0)
				return ret;

			next.fid = ret & GLOBAL_VTU_FID_MASK;

			ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL,
						  GLOBAL_VTU_SID);
			if (ret < 0)
				return ret;

			next.sid = ret & GLOBAL_VTU_SID_MASK;
		}
	}

	*entry = next;
	return 0;
}

static int _mv88e6xxx_vtu_loadpurge(struct dsa_switch *ds,
				    struct mv88e6xxx_vtu_stu_entry *entry)
{
	u16 reg = 0;
	int ret;

	ret = _mv88e6xxx_vtu_wait(ds);
	if (ret < 0)
		return ret;

	if (!entry->valid)
		goto loadpurge;

	/* Write port member tags */
	ret = _mv88e6xxx_vtu_stu_data_write(ds, entry, 0);
	if (ret < 0)
		return ret;

	if (mv88e6xxx_6097_family(ds) || mv88e6xxx_6165_family(ds) ||
	    mv88e6xxx_6351_family(ds) || mv88e6xxx_6352_family(ds)) {
		reg = entry->sid & GLOBAL_VTU_SID_MASK;
		ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_SID, reg);
		if (ret < 0)
			return ret;

		reg = entry->fid & GLOBAL_VTU_FID_MASK;
		ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_FID, reg);
		if (ret < 0)
			return ret;
	}

	reg = GLOBAL_VTU_VID_VALID;
loadpurge:
	reg |= entry->vid & GLOBAL_VTU_VID_MASK;
	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_VID, reg);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_vtu_cmd(ds, GLOBAL_VTU_OP_VTU_LOAD_PURGE);
}

static int _mv88e6xxx_stu_getnext(struct dsa_switch *ds, u8 sid,
				  struct mv88e6xxx_vtu_stu_entry *entry)
{
	struct mv88e6xxx_vtu_stu_entry next = { 0 };
	int ret;

	ret = _mv88e6xxx_vtu_wait(ds);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_SID,
				   sid & GLOBAL_VTU_SID_MASK);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_vtu_cmd(ds, GLOBAL_VTU_OP_STU_GET_NEXT);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_VTU_SID);
	if (ret < 0)
		return ret;

	next.sid = ret & GLOBAL_VTU_SID_MASK;

	ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_VTU_VID);
	if (ret < 0)
		return ret;

	next.valid = !!(ret & GLOBAL_VTU_VID_VALID);

	if (next.valid) {
		ret = _mv88e6xxx_vtu_stu_data_read(ds, &next, 2);
		if (ret < 0)
			return ret;
	}

	*entry = next;
	return 0;
}

static int _mv88e6xxx_stu_loadpurge(struct dsa_switch *ds,
				    struct mv88e6xxx_vtu_stu_entry *entry)
{
	u16 reg = 0;
	int ret;

	ret = _mv88e6xxx_vtu_wait(ds);
	if (ret < 0)
		return ret;

	if (!entry->valid)
		goto loadpurge;

	/* Write port states */
	ret = _mv88e6xxx_vtu_stu_data_write(ds, entry, 2);
	if (ret < 0)
		return ret;

	reg = GLOBAL_VTU_VID_VALID;
loadpurge:
	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_VID, reg);
	if (ret < 0)
		return ret;

	reg = entry->sid & GLOBAL_VTU_SID_MASK;
	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_VTU_SID, reg);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_vtu_cmd(ds, GLOBAL_VTU_OP_STU_LOAD_PURGE);
}

static int _mv88e6xxx_vlan_init(struct dsa_switch *ds, u16 vid,
				struct mv88e6xxx_vtu_stu_entry *entry)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	struct mv88e6xxx_vtu_stu_entry vlan = {
		.valid = true,
		.vid = vid,
		.fid = vid, /* We use one FID per VLAN */
	};
	int i;

	/* exclude all ports except the CPU and DSA ports */
	for (i = 0; i < ps->num_ports; ++i)
		vlan.data[i] = dsa_is_cpu_port(ds, i) || dsa_is_dsa_port(ds, i)
			? GLOBAL_VTU_DATA_MEMBER_TAG_UNMODIFIED
			: GLOBAL_VTU_DATA_MEMBER_TAG_NON_MEMBER;

	if (mv88e6xxx_6097_family(ds) || mv88e6xxx_6165_family(ds) ||
	    mv88e6xxx_6351_family(ds) || mv88e6xxx_6352_family(ds)) {
		struct mv88e6xxx_vtu_stu_entry vstp;
		int err;

		/* Adding a VTU entry requires a valid STU entry. As VSTP is not
		 * implemented, only one STU entry is needed to cover all VTU
		 * entries. Thus, validate the SID 0.
		 */
		vlan.sid = 0;
		err = _mv88e6xxx_stu_getnext(ds, GLOBAL_VTU_SID_MASK, &vstp);
		if (err)
			return err;

		if (vstp.sid != vlan.sid || !vstp.valid) {
			memset(&vstp, 0, sizeof(vstp));
			vstp.valid = true;
			vstp.sid = vlan.sid;

			err = _mv88e6xxx_stu_loadpurge(ds, &vstp);
			if (err)
				return err;
		}

		/* Clear all MAC addresses from the new database */
		err = _mv88e6xxx_atu_flush(ds, vlan.fid, true);
		if (err)
			return err;
	}

	*entry = vlan;
	return 0;
}

int mv88e6xxx_port_vlan_prepare(struct dsa_switch *ds, int port,
				const struct switchdev_obj_port_vlan *vlan,
				struct switchdev_trans *trans)
{
	/* We reserve a few VLANs to isolate unbridged ports */
	if (vlan->vid_end >= 4000)
		return -EOPNOTSUPP;

	/* We don't need any dynamic resource from the kernel (yet),
	 * so skip the prepare phase.
	 */
	return 0;
}

static int _mv88e6xxx_port_vlan_add(struct dsa_switch *ds, int port, u16 vid,
				    bool untagged)
{
	struct mv88e6xxx_vtu_stu_entry vlan;
	int err;

	err = _mv88e6xxx_vtu_vid_write(ds, vid - 1);
	if (err)
		return err;

	err = _mv88e6xxx_vtu_getnext(ds, &vlan);
	if (err)
		return err;

	if (vlan.vid != vid || !vlan.valid) {
		err = _mv88e6xxx_vlan_init(ds, vid, &vlan);
		if (err)
			return err;
	}

	vlan.data[port] = untagged ?
		GLOBAL_VTU_DATA_MEMBER_TAG_UNTAGGED :
		GLOBAL_VTU_DATA_MEMBER_TAG_TAGGED;

	return _mv88e6xxx_vtu_loadpurge(ds, &vlan);
}

int mv88e6xxx_port_vlan_add(struct dsa_switch *ds, int port,
			    const struct switchdev_obj_port_vlan *vlan,
			    struct switchdev_trans *trans)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
	u16 vid;
	int err = 0;

	mutex_lock(&ps->smi_mutex);

	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
		err = _mv88e6xxx_port_vlan_add(ds, port, vid, untagged);
		if (err)
			goto unlock;
	}

	/* no PVID with ranges, otherwise it's a bug */
	if (pvid)
		err = _mv88e6xxx_port_pvid_set(ds, port, vlan->vid_end);
unlock:
	mutex_unlock(&ps->smi_mutex);

	return err;
}

static int _mv88e6xxx_port_vlan_del(struct dsa_switch *ds, int port, u16 vid)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	struct mv88e6xxx_vtu_stu_entry vlan;
	int i, err;

	err = _mv88e6xxx_vtu_vid_write(ds, vid - 1);
	if (err)
		return err;

	err = _mv88e6xxx_vtu_getnext(ds, &vlan);
	if (err)
		return err;

	if (vlan.vid != vid || !vlan.valid ||
	    vlan.data[port] == GLOBAL_VTU_DATA_MEMBER_TAG_NON_MEMBER)
		return -ENOENT;

	vlan.data[port] = GLOBAL_VTU_DATA_MEMBER_TAG_NON_MEMBER;

	/* keep the VLAN unless all ports are excluded */
	vlan.valid = false;
	for (i = 0; i < ps->num_ports; ++i) {
		if (dsa_is_cpu_port(ds, i) || dsa_is_dsa_port(ds, i))
			continue;

		if (vlan.data[i] != GLOBAL_VTU_DATA_MEMBER_TAG_NON_MEMBER) {
			vlan.valid = true;
			break;
		}
	}

	err = _mv88e6xxx_vtu_loadpurge(ds, &vlan);
	if (err)
		return err;

	return _mv88e6xxx_atu_remove(ds, vlan.fid, port, false);
}

int mv88e6xxx_port_vlan_del(struct dsa_switch *ds, int port,
			    const struct switchdev_obj_port_vlan *vlan)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	u16 pvid, vid;
	int err = 0;

	mutex_lock(&ps->smi_mutex);

	err = _mv88e6xxx_port_pvid_get(ds, port, &pvid);
	if (err)
		goto unlock;

	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
		err = _mv88e6xxx_port_vlan_del(ds, port, vid);
		if (err)
			goto unlock;

		if (vid == pvid) {
			err = _mv88e6xxx_port_pvid_set(ds, port, 0);
			if (err)
				goto unlock;
		}
	}

unlock:
	mutex_unlock(&ps->smi_mutex);

	return err;
}

int mv88e6xxx_vlan_getnext(struct dsa_switch *ds, u16 *vid,
			   unsigned long *ports, unsigned long *untagged)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	struct mv88e6xxx_vtu_stu_entry next;
	int port;
	int err;

	if (*vid == 4095)
		return -ENOENT;

	mutex_lock(&ps->smi_mutex);
	err = _mv88e6xxx_vtu_vid_write(ds, *vid);
	if (err)
		goto unlock;

	err = _mv88e6xxx_vtu_getnext(ds, &next);
unlock:
	mutex_unlock(&ps->smi_mutex);

	if (err)
		return err;

	if (!next.valid)
		return -ENOENT;

	*vid = next.vid;

	for (port = 0; port < ps->num_ports; ++port) {
		clear_bit(port, ports);
		clear_bit(port, untagged);

		if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
			continue;

		if (next.data[port] == GLOBAL_VTU_DATA_MEMBER_TAG_TAGGED ||
		    next.data[port] == GLOBAL_VTU_DATA_MEMBER_TAG_UNTAGGED)
			set_bit(port, ports);

		if (next.data[port] == GLOBAL_VTU_DATA_MEMBER_TAG_UNTAGGED)
			set_bit(port, untagged);
	}

	return 0;
}

static int _mv88e6xxx_atu_mac_write(struct dsa_switch *ds,
				    const unsigned char *addr)
{
	int i, ret;

	for (i = 0; i < 3; i++) {
		ret = _mv88e6xxx_reg_write(
			ds, REG_GLOBAL, GLOBAL_ATU_MAC_01 + i,
			(addr[i * 2] << 8) | addr[i * 2 + 1]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int _mv88e6xxx_atu_mac_read(struct dsa_switch *ds, unsigned char *addr)
{
	int i, ret;

	for (i = 0; i < 3; i++) {
		ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL,
					  GLOBAL_ATU_MAC_01 + i);
		if (ret < 0)
			return ret;
		addr[i * 2] = ret >> 8;
		addr[i * 2 + 1] = ret & 0xff;
	}

	return 0;
}

static int _mv88e6xxx_atu_load(struct dsa_switch *ds,
			       struct mv88e6xxx_atu_entry *entry)
{
	int ret;

	ret = _mv88e6xxx_atu_wait(ds);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_atu_mac_write(ds, entry->mac);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_atu_data_write(ds, entry);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, entry->fid);
	if (ret < 0)
		return ret;

	return _mv88e6xxx_atu_cmd(ds, GLOBAL_ATU_OP_LOAD_DB);
}

static int _mv88e6xxx_port_fdb_load(struct dsa_switch *ds, int port,
				    const unsigned char *addr, u16 vid,
				    u8 state)
{
	struct mv88e6xxx_atu_entry entry = { 0 };

	entry.fid = vid; /* We use one FID per VLAN */
	entry.state = state;
	ether_addr_copy(entry.mac, addr);
	if (state != GLOBAL_ATU_DATA_STATE_UNUSED) {
		entry.trunk = false;
		entry.portv_trunkid = BIT(port);
	}

	return _mv88e6xxx_atu_load(ds, &entry);
}

int mv88e6xxx_port_fdb_prepare(struct dsa_switch *ds, int port,
			       const struct switchdev_obj_port_fdb *fdb,
			       struct switchdev_trans *trans)
{
	/* We don't use per-port FDB */
	if (fdb->vid == 0)
		return -EOPNOTSUPP;

	/* We don't need any dynamic resource from the kernel (yet),
	 * so skip the prepare phase.
	 */
	return 0;
}

int mv88e6xxx_port_fdb_add(struct dsa_switch *ds, int port,
			   const struct switchdev_obj_port_fdb *fdb,
			   struct switchdev_trans *trans)
{
	int state = is_multicast_ether_addr(fdb->addr) ?
		GLOBAL_ATU_DATA_STATE_MC_STATIC :
		GLOBAL_ATU_DATA_STATE_UC_STATIC;
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_port_fdb_load(ds, port, fdb->addr, fdb->vid, state);
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

int mv88e6xxx_port_fdb_del(struct dsa_switch *ds, int port,
			   const struct switchdev_obj_port_fdb *fdb)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_port_fdb_load(ds, port, fdb->addr, fdb->vid,
				       GLOBAL_ATU_DATA_STATE_UNUSED);
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

static int _mv88e6xxx_atu_getnext(struct dsa_switch *ds, u16 fid,
				  struct mv88e6xxx_atu_entry *entry)
{
	struct mv88e6xxx_atu_entry next = { 0 };
	int ret;

	next.fid = fid;

	ret = _mv88e6xxx_atu_wait(ds);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_write(ds, REG_GLOBAL, GLOBAL_ATU_FID, fid);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_atu_cmd(ds, GLOBAL_ATU_OP_GET_NEXT_DB);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_atu_mac_read(ds, next.mac);
	if (ret < 0)
		return ret;

	ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL, GLOBAL_ATU_DATA);
	if (ret < 0)
		return ret;

	next.state = ret & GLOBAL_ATU_DATA_STATE_MASK;
	if (next.state != GLOBAL_ATU_DATA_STATE_UNUSED) {
		unsigned int mask, shift;

		if (ret & GLOBAL_ATU_DATA_TRUNK) {
			next.trunk = true;
			mask = GLOBAL_ATU_DATA_TRUNK_ID_MASK;
			shift = GLOBAL_ATU_DATA_TRUNK_ID_SHIFT;
		} else {
			next.trunk = false;
			mask = GLOBAL_ATU_DATA_PORT_VECTOR_MASK;
			shift = GLOBAL_ATU_DATA_PORT_VECTOR_SHIFT;
		}

		next.portv_trunkid = (ret & mask) >> shift;
	}

	*entry = next;
	return 0;
}

int mv88e6xxx_port_fdb_dump(struct dsa_switch *ds, int port,
			    struct switchdev_obj_port_fdb *fdb,
			    int (*cb)(struct switchdev_obj *obj))
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	struct mv88e6xxx_vtu_stu_entry vlan = {
		.vid = GLOBAL_VTU_VID_MASK, /* all ones */
	};
	int err;

	mutex_lock(&ps->smi_mutex);

	err = _mv88e6xxx_vtu_vid_write(ds, vlan.vid);
	if (err)
		goto unlock;

	do {
		struct mv88e6xxx_atu_entry addr = {
			.mac = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
		};

		err = _mv88e6xxx_vtu_getnext(ds, &vlan);
		if (err)
			goto unlock;

		if (!vlan.valid)
			break;

		err = _mv88e6xxx_atu_mac_write(ds, addr.mac);
		if (err)
			goto unlock;

		do {
			err = _mv88e6xxx_atu_getnext(ds, vlan.fid, &addr);
			if (err)
				goto unlock;

			if (addr.state == GLOBAL_ATU_DATA_STATE_UNUSED)
				break;

			if (!addr.trunk && addr.portv_trunkid & BIT(port)) {
				bool is_static = addr.state ==
					(is_multicast_ether_addr(addr.mac) ?
					 GLOBAL_ATU_DATA_STATE_MC_STATIC :
					 GLOBAL_ATU_DATA_STATE_UC_STATIC);

				fdb->vid = vlan.vid;
				ether_addr_copy(fdb->addr, addr.mac);
				fdb->ndm_state = is_static ? NUD_NOARP :
					NUD_REACHABLE;

				err = cb(&fdb->obj);
				if (err)
					goto unlock;
			}
		} while (!is_broadcast_ether_addr(addr.mac));

	} while (vlan.vid < GLOBAL_VTU_VID_MASK);

unlock:
	mutex_unlock(&ps->smi_mutex);

	return err;
}

int mv88e6xxx_port_bridge_join(struct dsa_switch *ds, int port, u32 members)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	const u16 pvid = 4000 + ds->index * DSA_MAX_PORTS + port;
	int err;

	/* The port joined a bridge, so leave its reserved VLAN */
	mutex_lock(&ps->smi_mutex);
	err = _mv88e6xxx_port_vlan_del(ds, port, pvid);
	if (!err)
		err = _mv88e6xxx_port_pvid_set(ds, port, 0);
	mutex_unlock(&ps->smi_mutex);
	return err;
}

int mv88e6xxx_port_bridge_leave(struct dsa_switch *ds, int port, u32 members)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	const u16 pvid = 4000 + ds->index * DSA_MAX_PORTS + port;
	int err;

	/* The port left the bridge, so join its reserved VLAN */
	mutex_lock(&ps->smi_mutex);
	err = _mv88e6xxx_port_vlan_add(ds, port, pvid, true);
	if (!err)
		err = _mv88e6xxx_port_pvid_set(ds, port, pvid);
	mutex_unlock(&ps->smi_mutex);
	return err;
}

static void mv88e6xxx_bridge_work(struct work_struct *work)
{
	struct mv88e6xxx_priv_state *ps;
	struct dsa_switch *ds;
	int port;

	ps = container_of(work, struct mv88e6xxx_priv_state, bridge_work);
	ds = ((struct dsa_switch *)ps) - 1;

	while (ps->port_state_update_mask) {
		port = __ffs(ps->port_state_update_mask);
		clear_bit(port, &ps->port_state_update_mask);
		mv88e6xxx_set_port_state(ds, port, ps->port_state[port]);
	}
}

static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;
	u16 reg;

	mutex_lock(&ps->smi_mutex);

	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6185_family(ds) || mv88e6xxx_6095_family(ds) ||
	    mv88e6xxx_6065_family(ds) || mv88e6xxx_6320_family(ds)) {
		/* MAC Forcing register: don't force link, speed,
		 * duplex or flow control state to any particular
		 * values on physical ports, but force the CPU port
		 * and all DSA ports to their maximum bandwidth and
		 * full duplex.
		 */
		reg = _mv88e6xxx_reg_read(ds, REG_PORT(port), PORT_PCS_CTRL);
		if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)) {
			reg &= ~PORT_PCS_CTRL_UNFORCED;
			reg |= PORT_PCS_CTRL_FORCE_LINK |
				PORT_PCS_CTRL_LINK_UP |
				PORT_PCS_CTRL_DUPLEX_FULL |
				PORT_PCS_CTRL_FORCE_DUPLEX;
			if (mv88e6xxx_6065_family(ds))
				reg |= PORT_PCS_CTRL_100;
			else
				reg |= PORT_PCS_CTRL_1000;
		} else {
			reg |= PORT_PCS_CTRL_UNFORCED;
		}

		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_PCS_CTRL, reg);
		if (ret)
			goto abort;
	}

	/* Port Control: disable Drop-on-Unlock, disable Drop-on-Lock,
	 * disable Header mode, enable IGMP/MLD snooping, disable VLAN
	 * tunneling, determine priority by looking at 802.1p and IP
	 * priority fields (IP prio has precedence), and set STP state
	 * to Forwarding.
	 *
	 * If this is the CPU link, use DSA or EDSA tagging depending
	 * on which tagging mode was configured.
	 *
	 * If this is a link to another switch, use DSA tagging mode.
	 *
	 * If this is the upstream port for this switch, enable
	 * forwarding of unknown unicasts and multicasts.
	 */
	reg = 0;
	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6095_family(ds) || mv88e6xxx_6065_family(ds) ||
	    mv88e6xxx_6185_family(ds) || mv88e6xxx_6320_family(ds))
		reg = PORT_CONTROL_IGMP_MLD_SNOOP |
		PORT_CONTROL_USE_TAG | PORT_CONTROL_USE_IP |
		PORT_CONTROL_STATE_FORWARDING;
	if (dsa_is_cpu_port(ds, port)) {
		if (mv88e6xxx_6095_family(ds) || mv88e6xxx_6185_family(ds))
			reg |= PORT_CONTROL_DSA_TAG;
		if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
		    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
		    mv88e6xxx_6320_family(ds)) {
			if (ds->dst->tag_protocol == DSA_TAG_PROTO_EDSA)
				reg |= PORT_CONTROL_FRAME_ETHER_TYPE_DSA;
			else
				reg |= PORT_CONTROL_FRAME_MODE_DSA;
			reg |= PORT_CONTROL_FORWARD_UNKNOWN |
				PORT_CONTROL_FORWARD_UNKNOWN_MC;
		}

		if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
		    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
		    mv88e6xxx_6095_family(ds) || mv88e6xxx_6065_family(ds) ||
		    mv88e6xxx_6185_family(ds) || mv88e6xxx_6320_family(ds)) {
			if (ds->dst->tag_protocol == DSA_TAG_PROTO_EDSA)
				reg |= PORT_CONTROL_EGRESS_ADD_TAG;
		}
	}
	if (dsa_is_dsa_port(ds, port)) {
		if (mv88e6xxx_6095_family(ds) || mv88e6xxx_6185_family(ds))
			reg |= PORT_CONTROL_DSA_TAG;
		if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
		    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
		    mv88e6xxx_6320_family(ds)) {
			reg |= PORT_CONTROL_FRAME_MODE_DSA;
		}

		if (port == dsa_upstream_port(ds))
			reg |= PORT_CONTROL_FORWARD_UNKNOWN |
				PORT_CONTROL_FORWARD_UNKNOWN_MC;
	}
	if (reg) {
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_CONTROL, reg);
		if (ret)
			goto abort;
	}

	/* Port Control 2: don't force a good FCS, set the maximum frame size to
	 * 10240 bytes, enable secure 802.1q tags, don't discard tagged or
	 * untagged frames on this port, do a destination address lookup on all
	 * received packets as usual, disable ARP mirroring and don't send a
	 * copy of all transmitted/received frames on this port to the CPU.
	 */
	reg = 0;
	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6095_family(ds) || mv88e6xxx_6320_family(ds))
		reg = PORT_CONTROL_2_MAP_DA;

	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6320_family(ds))
		reg |= PORT_CONTROL_2_JUMBO_10240;

	if (mv88e6xxx_6095_family(ds) || mv88e6xxx_6185_family(ds)) {
		/* Set the upstream port this port should use */
		reg |= dsa_upstream_port(ds);
		/* enable forwarding of unknown multicast addresses to
		 * the upstream port
		 */
		if (port == dsa_upstream_port(ds))
			reg |= PORT_CONTROL_2_FORWARD_UNKNOWN;
	}

	reg |= PORT_CONTROL_2_8021Q_SECURE;

	if (reg) {
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_CONTROL_2, reg);
		if (ret)
			goto abort;
	}

	/* Port Association Vector: when learning source addresses
	 * of packets, add the address to the address database using
	 * a port bitmap that has only the bit for this port set and
	 * the other bits clear.
	 */
	reg = 1 << port;
	/* Disable learning for DSA and CPU ports */
	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
		reg = PORT_ASSOC_VECTOR_LOCKED_PORT;

	ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_ASSOC_VECTOR, reg);
	if (ret)
		goto abort;

	/* Egress rate control 2: disable egress rate control. */
	ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_RATE_CONTROL_2,
				   0x0000);
	if (ret)
		goto abort;

	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6320_family(ds)) {
		/* Do not limit the period of time that this port can
		 * be paused for by the remote end or the period of
		 * time that this port can pause the remote end.
		 */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_PAUSE_CTRL, 0x0000);
		if (ret)
			goto abort;

		/* Port ATU control: disable limiting the number of
		 * address database entries that this port is allowed
		 * to use.
		 */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_ATU_CONTROL, 0x0000);
		/* Priority Override: disable DA, SA and VTU priority
		 * override.
		 */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_PRI_OVERRIDE, 0x0000);
		if (ret)
			goto abort;

		/* Port Ethertype: use the Ethertype DSA Ethertype
		 * value.
		 */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_ETH_TYPE, ETH_P_EDSA);
		if (ret)
			goto abort;
		/* Tag Remap: use an identity 802.1p prio -> switch
		 * prio mapping.
		 */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_TAG_REGMAP_0123, 0x3210);
		if (ret)
			goto abort;

		/* Tag Remap 2: use an identity 802.1p prio -> switch
		 * prio mapping.
		 */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_TAG_REGMAP_4567, 0x7654);
		if (ret)
			goto abort;
	}

	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6185_family(ds) || mv88e6xxx_6095_family(ds) ||
	    mv88e6xxx_6320_family(ds)) {
		/* Rate Control: disable ingress rate limiting. */
		ret = _mv88e6xxx_reg_write(ds, REG_PORT(port),
					   PORT_RATE_CONTROL, 0x0001);
		if (ret)
			goto abort;
	}

	/* Port Control 1: disable trunking, disable sending
	 * learning messages to this port.
	 */
	ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_CONTROL_1, 0x0000);
	if (ret)
		goto abort;

	/* Port based VLAN map: do not give each port its own address
	 * database, and allow every port to egress frames on all other ports.
	 */
	reg = BIT(ps->num_ports) - 1; /* all ports */
	ret = _mv88e6xxx_port_vlan_map_set(ds, port, reg & ~port);
	if (ret)
		goto abort;

	/* Default VLAN ID and priority: don't set a default VLAN
	 * ID, and set the default packet priority to zero.
	 */
	ret = _mv88e6xxx_reg_write(ds, REG_PORT(port), PORT_DEFAULT_VLAN,
				   0x0000);
abort:
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

int mv88e6xxx_setup_ports(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;
	int i;

	for (i = 0; i < ps->num_ports; i++) {
		ret = mv88e6xxx_setup_port(ds, i);
		if (ret < 0)
			return ret;

		if (dsa_is_cpu_port(ds, i) || dsa_is_dsa_port(ds, i))
			continue;

		/* setup the unbridged state */
		ret = mv88e6xxx_port_bridge_leave(ds, i, 0);
		if (ret < 0)
			return ret;
	}
	return 0;
}

int mv88e6xxx_setup_common(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	mutex_init(&ps->smi_mutex);

	ps->id = REG_READ(REG_PORT(0), PORT_SWITCH_ID) & 0xfff0;

	INIT_WORK(&ps->bridge_work, mv88e6xxx_bridge_work);

	return 0;
}

int mv88e6xxx_setup_global(struct dsa_switch *ds)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;
	int i;

	/* Set the default address aging time to 5 minutes, and
	 * enable address learn messages to be sent to all message
	 * ports.
	 */
	REG_WRITE(REG_GLOBAL, GLOBAL_ATU_CONTROL,
		  0x0140 | GLOBAL_ATU_CONTROL_LEARN2ALL);

	/* Configure the IP ToS mapping registers. */
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_0, 0x0000);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_1, 0x0000);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_2, 0x5555);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_3, 0x5555);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_4, 0xaaaa);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_5, 0xaaaa);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_6, 0xffff);
	REG_WRITE(REG_GLOBAL, GLOBAL_IP_PRI_7, 0xffff);

	/* Configure the IEEE 802.1p priority mapping register. */
	REG_WRITE(REG_GLOBAL, GLOBAL_IEEE_PRI, 0xfa41);

	/* Send all frames with destination addresses matching
	 * 01:80:c2:00:00:0x to the CPU port.
	 */
	REG_WRITE(REG_GLOBAL2, GLOBAL2_MGMT_EN_0X, 0xffff);

	/* Ignore removed tag data on doubly tagged packets, disable
	 * flow control messages, force flow control priority to the
	 * highest, and send all special multicast frames to the CPU
	 * port at the highest priority.
	 */
	REG_WRITE(REG_GLOBAL2, GLOBAL2_SWITCH_MGMT,
		  0x7 | GLOBAL2_SWITCH_MGMT_RSVD2CPU | 0x70 |
		  GLOBAL2_SWITCH_MGMT_FORCE_FLOW_CTRL_PRI);

	/* Program the DSA routing table. */
	for (i = 0; i < 32; i++) {
		int nexthop = 0x1f;

		if (ds->pd->rtable &&
		    i != ds->index && i < ds->dst->pd->nr_chips)
			nexthop = ds->pd->rtable[i] & 0x1f;

		REG_WRITE(REG_GLOBAL2, GLOBAL2_DEVICE_MAPPING,
			  GLOBAL2_DEVICE_MAPPING_UPDATE |
			  (i << GLOBAL2_DEVICE_MAPPING_TARGET_SHIFT) |
			  nexthop);
	}

	/* Clear all trunk masks. */
	for (i = 0; i < 8; i++)
		REG_WRITE(REG_GLOBAL2, GLOBAL2_TRUNK_MASK,
			  0x8000 | (i << GLOBAL2_TRUNK_MASK_NUM_SHIFT) |
			  ((1 << ps->num_ports) - 1));

	/* Clear all trunk mappings. */
	for (i = 0; i < 16; i++)
		REG_WRITE(REG_GLOBAL2, GLOBAL2_TRUNK_MAPPING,
			  GLOBAL2_TRUNK_MAPPING_UPDATE |
			  (i << GLOBAL2_TRUNK_MAPPING_ID_SHIFT));

	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6320_family(ds)) {
		/* Send all frames with destination addresses matching
		 * 01:80:c2:00:00:2x to the CPU port.
		 */
		REG_WRITE(REG_GLOBAL2, GLOBAL2_MGMT_EN_2X, 0xffff);

		/* Initialise cross-chip port VLAN table to reset
		 * defaults.
		 */
		REG_WRITE(REG_GLOBAL2, GLOBAL2_PVT_ADDR, 0x9000);

		/* Clear the priority override table. */
		for (i = 0; i < 16; i++)
			REG_WRITE(REG_GLOBAL2, GLOBAL2_PRIO_OVERRIDE,
				  0x8000 | (i << 8));
	}

	if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
	    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
	    mv88e6xxx_6185_family(ds) || mv88e6xxx_6095_family(ds) ||
	    mv88e6xxx_6320_family(ds)) {
		/* Disable ingress rate limiting by resetting all
		 * ingress rate limit registers to their initial
		 * state.
		 */
		for (i = 0; i < ps->num_ports; i++)
			REG_WRITE(REG_GLOBAL2, GLOBAL2_INGRESS_OP,
				  0x9000 | (i << 8));
	}

	/* Clear the statistics counters for all ports */
	REG_WRITE(REG_GLOBAL, GLOBAL_STATS_OP, GLOBAL_STATS_OP_FLUSH_ALL);

	/* Wait for the flush to complete. */
	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_stats_wait(ds);
	if (ret < 0)
		goto unlock;

	/* Clear all ATU entries */
	ret = _mv88e6xxx_atu_flush(ds, 0, true);
	if (ret < 0)
		goto unlock;

	/* Clear all the VTU and STU entries */
	ret = _mv88e6xxx_vtu_stu_flush(ds);
unlock:
	mutex_unlock(&ps->smi_mutex);

	return ret;
}

int mv88e6xxx_switch_reset(struct dsa_switch *ds, bool ppu_active)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	u16 is_reset = (ppu_active ? 0x8800 : 0xc800);
	unsigned long timeout;
	int ret;
	int i;

	/* Set all ports to the disabled state. */
	for (i = 0; i < ps->num_ports; i++) {
		ret = REG_READ(REG_PORT(i), PORT_CONTROL);
		REG_WRITE(REG_PORT(i), PORT_CONTROL, ret & 0xfffc);
	}

	/* Wait for transmit queues to drain. */
	usleep_range(2000, 4000);

	/* Reset the switch. Keep the PPU active if requested. The PPU
	 * needs to be active to support indirect phy register access
	 * through global registers 0x18 and 0x19.
	 */
	if (ppu_active)
		REG_WRITE(REG_GLOBAL, 0x04, 0xc000);
	else
		REG_WRITE(REG_GLOBAL, 0x04, 0xc400);

	/* Wait up to one second for reset to complete. */
	timeout = jiffies + 1 * HZ;
	while (time_before(jiffies, timeout)) {
		ret = REG_READ(REG_GLOBAL, 0x00);
		if ((ret & is_reset) == is_reset)
			break;
		usleep_range(1000, 2000);
	}
	if (time_after(jiffies, timeout))
		return -ETIMEDOUT;

	return 0;
}

int mv88e6xxx_phy_page_read(struct dsa_switch *ds, int port, int page, int reg)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
	if (ret < 0)
		goto error;
	ret = _mv88e6xxx_phy_read_indirect(ds, port, reg);
error:
	_mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

int mv88e6xxx_phy_page_write(struct dsa_switch *ds, int port, int page,
			     int reg, int val)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_phy_write_indirect(ds, port, 0x16, page);
	if (ret < 0)
		goto error;

	ret = _mv88e6xxx_phy_write_indirect(ds, port, reg, val);
error:
	_mv88e6xxx_phy_write_indirect(ds, port, 0x16, 0x0);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

static int mv88e6xxx_port_to_phy_addr(struct dsa_switch *ds, int port)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);

	if (port >= 0 && port < ps->num_ports)
		return port;
	return -EINVAL;
}

int
mv88e6xxx_phy_read(struct dsa_switch *ds, int port, int regnum)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int addr = mv88e6xxx_port_to_phy_addr(ds, port);
	int ret;

	if (addr < 0)
		return addr;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_phy_read(ds, addr, regnum);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

int
mv88e6xxx_phy_write(struct dsa_switch *ds, int port, int regnum, u16 val)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int addr = mv88e6xxx_port_to_phy_addr(ds, port);
	int ret;

	if (addr < 0)
		return addr;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_phy_write(ds, addr, regnum, val);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

int
mv88e6xxx_phy_read_indirect(struct dsa_switch *ds, int port, int regnum)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int addr = mv88e6xxx_port_to_phy_addr(ds, port);
	int ret;

	if (addr < 0)
		return addr;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_phy_read_indirect(ds, addr, regnum);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

int
mv88e6xxx_phy_write_indirect(struct dsa_switch *ds, int port, int regnum,
			     u16 val)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int addr = mv88e6xxx_port_to_phy_addr(ds, port);
	int ret;

	if (addr < 0)
		return addr;

	mutex_lock(&ps->smi_mutex);
	ret = _mv88e6xxx_phy_write_indirect(ds, addr, regnum, val);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

#ifdef CONFIG_NET_DSA_HWMON

static int mv88e61xx_get_temp(struct dsa_switch *ds, int *temp)
{
	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
	int ret;
	int val;

	*temp = 0;

	mutex_lock(&ps->smi_mutex);

	ret = _mv88e6xxx_phy_write(ds, 0x0, 0x16, 0x6);
	if (ret < 0)
		goto error;

	/* Enable temperature sensor */
	ret = _mv88e6xxx_phy_read(ds, 0x0, 0x1a);
	if (ret < 0)
		goto error;

	ret = _mv88e6xxx_phy_write(ds, 0x0, 0x1a, ret | (1 << 5));
	if (ret < 0)
		goto error;

	/* Wait for temperature to stabilize */
	usleep_range(10000, 12000);

	val = _mv88e6xxx_phy_read(ds, 0x0, 0x1a);
	if (val < 0) {
		ret = val;
		goto error;
	}

	/* Disable temperature sensor */
	ret = _mv88e6xxx_phy_write(ds, 0x0, 0x1a, ret & ~(1 << 5));
	if (ret < 0)
		goto error;

	*temp = ((val & 0x1f) - 5) * 5;

error:
	_mv88e6xxx_phy_write(ds, 0x0, 0x16, 0x0);
	mutex_unlock(&ps->smi_mutex);
	return ret;
}

static int mv88e63xx_get_temp(struct dsa_switch *ds, int *temp)
{
	int phy = mv88e6xxx_6320_family(ds) ? 3 : 0;
	int ret;

	*temp = 0;

	ret = mv88e6xxx_phy_page_read(ds, phy, 6, 27);
	if (ret < 0)
		return ret;

	*temp = (ret & 0xff) - 25;

	return 0;
}

int mv88e6xxx_get_temp(struct dsa_switch *ds, int *temp)
{
	if (mv88e6xxx_6320_family(ds) || mv88e6xxx_6352_family(ds))
		return mv88e63xx_get_temp(ds, temp);

	return mv88e61xx_get_temp(ds, temp);
}

int mv88e6xxx_get_temp_limit(struct dsa_switch *ds, int *temp)
{
	int phy = mv88e6xxx_6320_family(ds) ? 3 : 0;
	int ret;

	if (!mv88e6xxx_6320_family(ds) && !mv88e6xxx_6352_family(ds))
		return -EOPNOTSUPP;

	*temp = 0;

	ret = mv88e6xxx_phy_page_read(ds, phy, 6, 26);
	if (ret < 0)
		return ret;

	*temp = (((ret >> 8) & 0x1f) * 5) - 25;

	return 0;
}

int mv88e6xxx_set_temp_limit(struct dsa_switch *ds, int temp)
{
	int phy = mv88e6xxx_6320_family(ds) ? 3 : 0;
	int ret;

	if (!mv88e6xxx_6320_family(ds) && !mv88e6xxx_6352_family(ds))
		return -EOPNOTSUPP;

	ret = mv88e6xxx_phy_page_read(ds, phy, 6, 26);
	if (ret < 0)
		return ret;
	temp = clamp_val(DIV_ROUND_CLOSEST(temp, 5) + 5, 0, 0x1f);
	return mv88e6xxx_phy_page_write(ds, phy, 6, 26,
					(ret & 0xe0ff) | (temp << 8));
}

int mv88e6xxx_get_temp_alarm(struct dsa_switch *ds, bool *alarm)
{
	int phy = mv88e6xxx_6320_family(ds) ? 3 : 0;
	int ret;

	if (!mv88e6xxx_6320_family(ds) && !mv88e6xxx_6352_family(ds))
		return -EOPNOTSUPP;

	*alarm = false;

	ret = mv88e6xxx_phy_page_read(ds, phy, 6, 26);
	if (ret < 0)
		return ret;

	*alarm = !!(ret & 0x40);

	return 0;
}
#endif /* CONFIG_NET_DSA_HWMON */

char *mv88e6xxx_lookup_name(struct device *host_dev, int sw_addr,
			    const struct mv88e6xxx_switch_id *table,
			    unsigned int num)
{
	struct mii_bus *bus = dsa_host_dev_to_mii_bus(host_dev);
	int i, ret;

	if (!bus)
		return NULL;

	ret = __mv88e6xxx_reg_read(bus, sw_addr, REG_PORT(0), PORT_SWITCH_ID);
	if (ret < 0)
		return NULL;

	/* Look up the exact switch ID */
	for (i = 0; i < num; ++i)
		if (table[i].id == ret)
			return table[i].name;

	/* Look up only the product number */
	for (i = 0; i < num; ++i) {
		if (table[i].id == (ret & PORT_SWITCH_ID_PROD_NUM_MASK)) {
			dev_warn(host_dev, "unknown revision %d, using base switch 0x%x\n",
				 ret & PORT_SWITCH_ID_REV_MASK,
				 ret & PORT_SWITCH_ID_PROD_NUM_MASK);
			return table[i].name;
		}
	}

	return NULL;
}

static int __init mv88e6xxx_init(void)
{
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6131)
	register_switch_driver(&mv88e6131_switch_driver);
#endif
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6123_61_65)
	register_switch_driver(&mv88e6123_61_65_switch_driver);
#endif
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6352)
	register_switch_driver(&mv88e6352_switch_driver);
#endif
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6171)
	register_switch_driver(&mv88e6171_switch_driver);
#endif
	return 0;
}
module_init(mv88e6xxx_init);

static void __exit mv88e6xxx_cleanup(void)
{
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6171)
	unregister_switch_driver(&mv88e6171_switch_driver);
#endif
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6352)
	unregister_switch_driver(&mv88e6352_switch_driver);
#endif
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6123_61_65)
	unregister_switch_driver(&mv88e6123_61_65_switch_driver);
#endif
#if IS_ENABLED(CONFIG_NET_DSA_MV88E6131)
	unregister_switch_driver(&mv88e6131_switch_driver);
#endif
}
module_exit(mv88e6xxx_cleanup);

MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
MODULE_DESCRIPTION("Driver for Marvell 88E6XXX ethernet switch chips");
MODULE_LICENSE("GPL");