openwrt/target/linux/generic/files/drivers/net/phy/ar8216.c

/*
 * ar8216.c: AR8216 switch driver
 *
 * Copyright (C) 2009 Felix Fietkau <nbd@nbd.name>
 * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/bitops.h>
#include <net/genetlink.h>
#include <linux/switch.h>
#include <linux/delay.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/lockdep.h>
#include <linux/ar8216_platform.h>
#include <linux/workqueue.h>
#include <linux/version.h>

#include "ar8216.h"

extern const struct ar8xxx_chip ar8327_chip;
extern const struct ar8xxx_chip ar8337_chip;

#define AR8XXX_MIB_WORK_DELAY	2000 /* msecs */

#define MIB_DESC(_s , _o, _n)	\
	{			\
		.size = (_s),	\
		.offset = (_o),	\
		.name = (_n),	\
	}

static const struct ar8xxx_mib_desc ar8216_mibs[] = {
	MIB_DESC(1, AR8216_STATS_RXBROAD, "RxBroad"),
	MIB_DESC(1, AR8216_STATS_RXPAUSE, "RxPause"),
	MIB_DESC(1, AR8216_STATS_RXMULTI, "RxMulti"),
	MIB_DESC(1, AR8216_STATS_RXFCSERR, "RxFcsErr"),
	MIB_DESC(1, AR8216_STATS_RXALIGNERR, "RxAlignErr"),
	MIB_DESC(1, AR8216_STATS_RXRUNT, "RxRunt"),
	MIB_DESC(1, AR8216_STATS_RXFRAGMENT, "RxFragment"),
	MIB_DESC(1, AR8216_STATS_RX64BYTE, "Rx64Byte"),
	MIB_DESC(1, AR8216_STATS_RX128BYTE, "Rx128Byte"),
	MIB_DESC(1, AR8216_STATS_RX256BYTE, "Rx256Byte"),
	MIB_DESC(1, AR8216_STATS_RX512BYTE, "Rx512Byte"),
	MIB_DESC(1, AR8216_STATS_RX1024BYTE, "Rx1024Byte"),
	MIB_DESC(1, AR8216_STATS_RXMAXBYTE, "RxMaxByte"),
	MIB_DESC(1, AR8216_STATS_RXTOOLONG, "RxTooLong"),
	MIB_DESC(2, AR8216_STATS_RXGOODBYTE, "RxGoodByte"),
	MIB_DESC(2, AR8216_STATS_RXBADBYTE, "RxBadByte"),
	MIB_DESC(1, AR8216_STATS_RXOVERFLOW, "RxOverFlow"),
	MIB_DESC(1, AR8216_STATS_FILTERED, "Filtered"),
	MIB_DESC(1, AR8216_STATS_TXBROAD, "TxBroad"),
	MIB_DESC(1, AR8216_STATS_TXPAUSE, "TxPause"),
	MIB_DESC(1, AR8216_STATS_TXMULTI, "TxMulti"),
	MIB_DESC(1, AR8216_STATS_TXUNDERRUN, "TxUnderRun"),
	MIB_DESC(1, AR8216_STATS_TX64BYTE, "Tx64Byte"),
	MIB_DESC(1, AR8216_STATS_TX128BYTE, "Tx128Byte"),
	MIB_DESC(1, AR8216_STATS_TX256BYTE, "Tx256Byte"),
	MIB_DESC(1, AR8216_STATS_TX512BYTE, "Tx512Byte"),
	MIB_DESC(1, AR8216_STATS_TX1024BYTE, "Tx1024Byte"),
	MIB_DESC(1, AR8216_STATS_TXMAXBYTE, "TxMaxByte"),
	MIB_DESC(1, AR8216_STATS_TXOVERSIZE, "TxOverSize"),
	MIB_DESC(2, AR8216_STATS_TXBYTE, "TxByte"),
	MIB_DESC(1, AR8216_STATS_TXCOLLISION, "TxCollision"),
	MIB_DESC(1, AR8216_STATS_TXABORTCOL, "TxAbortCol"),
	MIB_DESC(1, AR8216_STATS_TXMULTICOL, "TxMultiCol"),
	MIB_DESC(1, AR8216_STATS_TXSINGLECOL, "TxSingleCol"),
	MIB_DESC(1, AR8216_STATS_TXEXCDEFER, "TxExcDefer"),
	MIB_DESC(1, AR8216_STATS_TXDEFER, "TxDefer"),
	MIB_DESC(1, AR8216_STATS_TXLATECOL, "TxLateCol"),
};

const struct ar8xxx_mib_desc ar8236_mibs[39] = {
	MIB_DESC(1, AR8236_STATS_RXBROAD, "RxBroad"),
	MIB_DESC(1, AR8236_STATS_RXPAUSE, "RxPause"),
	MIB_DESC(1, AR8236_STATS_RXMULTI, "RxMulti"),
	MIB_DESC(1, AR8236_STATS_RXFCSERR, "RxFcsErr"),
	MIB_DESC(1, AR8236_STATS_RXALIGNERR, "RxAlignErr"),
	MIB_DESC(1, AR8236_STATS_RXRUNT, "RxRunt"),
	MIB_DESC(1, AR8236_STATS_RXFRAGMENT, "RxFragment"),
	MIB_DESC(1, AR8236_STATS_RX64BYTE, "Rx64Byte"),
	MIB_DESC(1, AR8236_STATS_RX128BYTE, "Rx128Byte"),
	MIB_DESC(1, AR8236_STATS_RX256BYTE, "Rx256Byte"),
	MIB_DESC(1, AR8236_STATS_RX512BYTE, "Rx512Byte"),
	MIB_DESC(1, AR8236_STATS_RX1024BYTE, "Rx1024Byte"),
	MIB_DESC(1, AR8236_STATS_RX1518BYTE, "Rx1518Byte"),
	MIB_DESC(1, AR8236_STATS_RXMAXBYTE, "RxMaxByte"),
	MIB_DESC(1, AR8236_STATS_RXTOOLONG, "RxTooLong"),
	MIB_DESC(2, AR8236_STATS_RXGOODBYTE, "RxGoodByte"),
	MIB_DESC(2, AR8236_STATS_RXBADBYTE, "RxBadByte"),
	MIB_DESC(1, AR8236_STATS_RXOVERFLOW, "RxOverFlow"),
	MIB_DESC(1, AR8236_STATS_FILTERED, "Filtered"),
	MIB_DESC(1, AR8236_STATS_TXBROAD, "TxBroad"),
	MIB_DESC(1, AR8236_STATS_TXPAUSE, "TxPause"),
	MIB_DESC(1, AR8236_STATS_TXMULTI, "TxMulti"),
	MIB_DESC(1, AR8236_STATS_TXUNDERRUN, "TxUnderRun"),
	MIB_DESC(1, AR8236_STATS_TX64BYTE, "Tx64Byte"),
	MIB_DESC(1, AR8236_STATS_TX128BYTE, "Tx128Byte"),
	MIB_DESC(1, AR8236_STATS_TX256BYTE, "Tx256Byte"),
	MIB_DESC(1, AR8236_STATS_TX512BYTE, "Tx512Byte"),
	MIB_DESC(1, AR8236_STATS_TX1024BYTE, "Tx1024Byte"),
	MIB_DESC(1, AR8236_STATS_TX1518BYTE, "Tx1518Byte"),
	MIB_DESC(1, AR8236_STATS_TXMAXBYTE, "TxMaxByte"),
	MIB_DESC(1, AR8236_STATS_TXOVERSIZE, "TxOverSize"),
	MIB_DESC(2, AR8236_STATS_TXBYTE, "TxByte"),
	MIB_DESC(1, AR8236_STATS_TXCOLLISION, "TxCollision"),
	MIB_DESC(1, AR8236_STATS_TXABORTCOL, "TxAbortCol"),
	MIB_DESC(1, AR8236_STATS_TXMULTICOL, "TxMultiCol"),
	MIB_DESC(1, AR8236_STATS_TXSINGLECOL, "TxSingleCol"),
	MIB_DESC(1, AR8236_STATS_TXEXCDEFER, "TxExcDefer"),
	MIB_DESC(1, AR8236_STATS_TXDEFER, "TxDefer"),
	MIB_DESC(1, AR8236_STATS_TXLATECOL, "TxLateCol"),
};

static DEFINE_MUTEX(ar8xxx_dev_list_lock);
static LIST_HEAD(ar8xxx_dev_list);

/* inspired by phy_poll_reset in drivers/net/phy/phy_device.c */
static int
ar8xxx_phy_poll_reset(struct mii_bus *bus)
{
        unsigned int sleep_msecs = 20;
        int ret, elapsed, i;

        for (elapsed = sleep_msecs; elapsed <= 600;
	     elapsed += sleep_msecs) {
                msleep(sleep_msecs);
                for (i = 0; i < AR8XXX_NUM_PHYS; i++) {
                        ret = mdiobus_read(bus, i, MII_BMCR);
                        if (ret < 0)
				return ret;
                        if (ret & BMCR_RESET)
				break;
                        if (i == AR8XXX_NUM_PHYS - 1) {
                                usleep_range(1000, 2000);
                                return 0;
                        }
                }
        }
        return -ETIMEDOUT;
}

static int
ar8xxx_phy_check_aneg(struct phy_device *phydev)
{
	int ret;

	if (phydev->autoneg != AUTONEG_ENABLE)
		return 0;
	/*
	 * BMCR_ANENABLE might have been cleared
	 * by phy_init_hw in certain kernel versions
	 * therefore check for it
	 */
	ret = phy_read(phydev, MII_BMCR);
	if (ret < 0)
		return ret;
	if (ret & BMCR_ANENABLE)
		return 0;

	dev_info(&phydev->mdio.dev, "ANEG disabled, re-enabling ...\n");
	ret |= BMCR_ANENABLE | BMCR_ANRESTART;
	return phy_write(phydev, MII_BMCR, ret);
}

void
ar8xxx_phy_init(struct ar8xxx_priv *priv)
{
	int i;
	struct mii_bus *bus;

	bus = priv->mii_bus;
	for (i = 0; i < AR8XXX_NUM_PHYS; i++) {
		if (priv->chip->phy_fixup)
			priv->chip->phy_fixup(priv, i);

		/* initialize the port itself */
		mdiobus_write(bus, i, MII_ADVERTISE,
			ADVERTISE_ALL | ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM);
		if (ar8xxx_has_gige(priv))
			mdiobus_write(bus, i, MII_CTRL1000, ADVERTISE_1000FULL);
		mdiobus_write(bus, i, MII_BMCR, BMCR_RESET | BMCR_ANENABLE);
	}

	ar8xxx_phy_poll_reset(bus);
}

u32
ar8xxx_mii_read32(struct ar8xxx_priv *priv, int phy_id, int regnum)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 lo, hi;

	lo = bus->read(bus, phy_id, regnum);
	hi = bus->read(bus, phy_id, regnum + 1);

	return (hi << 16) | lo;
}

void
ar8xxx_mii_write32(struct ar8xxx_priv *priv, int phy_id, int regnum, u32 val)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 lo, hi;

	lo = val & 0xffff;
	hi = (u16) (val >> 16);

	if (priv->chip->mii_lo_first)
	{
		bus->write(bus, phy_id, regnum, lo);
		bus->write(bus, phy_id, regnum + 1, hi);
	} else {
		bus->write(bus, phy_id, regnum + 1, hi);
		bus->write(bus, phy_id, regnum, lo);
	}
}

u32
ar8xxx_read(struct ar8xxx_priv *priv, int reg)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 r1, r2, page;
	u32 val;

	split_addr((u32) reg, &r1, &r2, &page);

	mutex_lock(&bus->mdio_lock);

	bus->write(bus, 0x18, 0, page);
	wait_for_page_switch();
	val = ar8xxx_mii_read32(priv, 0x10 | r2, r1);

	mutex_unlock(&bus->mdio_lock);

	return val;
}

void
ar8xxx_write(struct ar8xxx_priv *priv, int reg, u32 val)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 r1, r2, page;

	split_addr((u32) reg, &r1, &r2, &page);

	mutex_lock(&bus->mdio_lock);

	bus->write(bus, 0x18, 0, page);
	wait_for_page_switch();
	ar8xxx_mii_write32(priv, 0x10 | r2, r1, val);

	mutex_unlock(&bus->mdio_lock);
}

u32
ar8xxx_rmw(struct ar8xxx_priv *priv, int reg, u32 mask, u32 val)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 r1, r2, page;
	u32 ret;

	split_addr((u32) reg, &r1, &r2, &page);

	mutex_lock(&bus->mdio_lock);

	bus->write(bus, 0x18, 0, page);
	wait_for_page_switch();

	ret = ar8xxx_mii_read32(priv, 0x10 | r2, r1);
	ret &= ~mask;
	ret |= val;
	ar8xxx_mii_write32(priv, 0x10 | r2, r1, ret);

	mutex_unlock(&bus->mdio_lock);

	return ret;
}

void
ar8xxx_phy_dbg_write(struct ar8xxx_priv *priv, int phy_addr,
		     u16 dbg_addr, u16 dbg_data)
{
	struct mii_bus *bus = priv->mii_bus;

	mutex_lock(&bus->mdio_lock);
	bus->write(bus, phy_addr, MII_ATH_DBG_ADDR, dbg_addr);
	bus->write(bus, phy_addr, MII_ATH_DBG_DATA, dbg_data);
	mutex_unlock(&bus->mdio_lock);
}

static inline void
ar8xxx_phy_mmd_prep(struct mii_bus *bus, int phy_addr, u16 addr, u16 reg)
{
	bus->write(bus, phy_addr, MII_ATH_MMD_ADDR, addr);
	bus->write(bus, phy_addr, MII_ATH_MMD_DATA, reg);
	bus->write(bus, phy_addr, MII_ATH_MMD_ADDR, addr | 0x4000);
}

void
ar8xxx_phy_mmd_write(struct ar8xxx_priv *priv, int phy_addr, u16 addr, u16 reg, u16 data)
{
	struct mii_bus *bus = priv->mii_bus;

	mutex_lock(&bus->mdio_lock);
	ar8xxx_phy_mmd_prep(bus, phy_addr, addr, reg);
	bus->write(bus, phy_addr, MII_ATH_MMD_DATA, data);
	mutex_unlock(&bus->mdio_lock);
}

u16
ar8xxx_phy_mmd_read(struct ar8xxx_priv *priv, int phy_addr, u16 addr, u16 reg)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 data;

	mutex_lock(&bus->mdio_lock);
	ar8xxx_phy_mmd_prep(bus, phy_addr, addr, reg);
	data = bus->read(bus, phy_addr, MII_ATH_MMD_DATA);
	mutex_unlock(&bus->mdio_lock);

	return data;
}

static int
ar8xxx_reg_wait(struct ar8xxx_priv *priv, u32 reg, u32 mask, u32 val,
		unsigned timeout)
{
	int i;

	for (i = 0; i < timeout; i++) {
		u32 t;

		t = ar8xxx_read(priv, reg);
		if ((t & mask) == val)
			return 0;

		usleep_range(1000, 2000);
		cond_resched();
	}

	return -ETIMEDOUT;
}

static int
ar8xxx_mib_op(struct ar8xxx_priv *priv, u32 op)
{
	unsigned mib_func = priv->chip->mib_func;
	int ret;

	lockdep_assert_held(&priv->mib_lock);

	/* Capture the hardware statistics for all ports */
	ar8xxx_rmw(priv, mib_func, AR8216_MIB_FUNC, (op << AR8216_MIB_FUNC_S));

	/* Wait for the capturing to complete. */
	ret = ar8xxx_reg_wait(priv, mib_func, AR8216_MIB_BUSY, 0, 10);
	if (ret)
		goto out;

	ret = 0;

out:
	return ret;
}

static int
ar8xxx_mib_capture(struct ar8xxx_priv *priv)
{
	return ar8xxx_mib_op(priv, AR8216_MIB_FUNC_CAPTURE);
}

static int
ar8xxx_mib_flush(struct ar8xxx_priv *priv)
{
	return ar8xxx_mib_op(priv, AR8216_MIB_FUNC_FLUSH);
}

static void
ar8xxx_mib_fetch_port_stat(struct ar8xxx_priv *priv, int port, bool flush)
{
	unsigned int base;
	u64 *mib_stats;
	int i;

	WARN_ON(port >= priv->dev.ports);

	lockdep_assert_held(&priv->mib_lock);

	base = priv->chip->reg_port_stats_start +
	       priv->chip->reg_port_stats_length * port;

	mib_stats = &priv->mib_stats[port * priv->chip->num_mibs];
	for (i = 0; i < priv->chip->num_mibs; i++) {
		const struct ar8xxx_mib_desc *mib;
		u64 t;

		mib = &priv->chip->mib_decs[i];
		t = ar8xxx_read(priv, base + mib->offset);
		if (mib->size == 2) {
			u64 hi;

			hi = ar8xxx_read(priv, base + mib->offset + 4);
			t |= hi << 32;
		}

		if (flush)
			mib_stats[i] = 0;
		else
			mib_stats[i] += t;
		cond_resched();
	}
}

static void
ar8216_read_port_link(struct ar8xxx_priv *priv, int port,
		      struct switch_port_link *link)
{
	u32 status;
	u32 speed;

	memset(link, '\0', sizeof(*link));

	status = priv->chip->read_port_status(priv, port);

	link->aneg = !!(status & AR8216_PORT_STATUS_LINK_AUTO);
	if (link->aneg) {
		link->link = !!(status & AR8216_PORT_STATUS_LINK_UP);
	} else {
		link->link = true;

		if (priv->get_port_link) {
			int err;

			err = priv->get_port_link(port);
			if (err >= 0)
				link->link = !!err;
		}
	}

	if (!link->link)
		return;

	link->duplex = !!(status & AR8216_PORT_STATUS_DUPLEX);
	link->tx_flow = !!(status & AR8216_PORT_STATUS_TXFLOW);
	link->rx_flow = !!(status & AR8216_PORT_STATUS_RXFLOW);

	if (link->aneg && link->duplex && priv->chip->read_port_eee_status)
		link->eee = priv->chip->read_port_eee_status(priv, port);

	speed = (status & AR8216_PORT_STATUS_SPEED) >>
		 AR8216_PORT_STATUS_SPEED_S;

	switch (speed) {
	case AR8216_PORT_SPEED_10M:
		link->speed = SWITCH_PORT_SPEED_10;
		break;
	case AR8216_PORT_SPEED_100M:
		link->speed = SWITCH_PORT_SPEED_100;
		break;
	case AR8216_PORT_SPEED_1000M:
		link->speed = SWITCH_PORT_SPEED_1000;
		break;
	default:
		link->speed = SWITCH_PORT_SPEED_UNKNOWN;
		break;
	}
}

static struct sk_buff *
ar8216_mangle_tx(struct net_device *dev, struct sk_buff *skb)
{
	struct ar8xxx_priv *priv = dev->phy_ptr;
	unsigned char *buf;

	if (unlikely(!priv))
		goto error;

	if (!priv->vlan)
		goto send;

	if (unlikely(skb_headroom(skb) < 2)) {
		if (pskb_expand_head(skb, 2, 0, GFP_ATOMIC) < 0)
			goto error;
	}

	buf = skb_push(skb, 2);
	buf[0] = 0x10;
	buf[1] = 0x80;

send:
	return skb;

error:
	dev_kfree_skb_any(skb);
	return NULL;
}

static void
ar8216_mangle_rx(struct net_device *dev, struct sk_buff *skb)
{
	struct ar8xxx_priv *priv;
	unsigned char *buf;
	int port, vlan;

	priv = dev->phy_ptr;
	if (!priv)
		return;

	/* don't strip the header if vlan mode is disabled */
	if (!priv->vlan)
		return;

	/* strip header, get vlan id */
	buf = skb->data;
	skb_pull(skb, 2);

	/* check for vlan header presence */
	if ((buf[12 + 2] != 0x81) || (buf[13 + 2] != 0x00))
		return;

	port = buf[0] & 0x7;

	/* no need to fix up packets coming from a tagged source */
	if (priv->vlan_tagged & (1 << port))
		return;

	/* lookup port vid from local table, the switch passes an invalid vlan id */
	vlan = priv->vlan_id[priv->pvid[port]];

	buf[14 + 2] &= 0xf0;
	buf[14 + 2] |= vlan >> 8;
	buf[15 + 2] = vlan & 0xff;
}

int
ar8216_wait_bit(struct ar8xxx_priv *priv, int reg, u32 mask, u32 val)
{
	int timeout = 20;
	u32 t = 0;

	while (1) {
		t = ar8xxx_read(priv, reg);
		if ((t & mask) == val)
			return 0;

		if (timeout-- <= 0)
			break;

		udelay(10);
		cond_resched();
	}

	pr_err("ar8216: timeout on reg %08x: %08x & %08x != %08x\n",
	       (unsigned int) reg, t, mask, val);
	return -ETIMEDOUT;
}

static void
ar8216_vtu_op(struct ar8xxx_priv *priv, u32 op, u32 val)
{
	if (ar8216_wait_bit(priv, AR8216_REG_VTU, AR8216_VTU_ACTIVE, 0))
		return;
	if ((op & AR8216_VTU_OP) == AR8216_VTU_OP_LOAD) {
		val &= AR8216_VTUDATA_MEMBER;
		val |= AR8216_VTUDATA_VALID;
		ar8xxx_write(priv, AR8216_REG_VTU_DATA, val);
	}
	op |= AR8216_VTU_ACTIVE;
	ar8xxx_write(priv, AR8216_REG_VTU, op);
}

static void
ar8216_vtu_flush(struct ar8xxx_priv *priv)
{
	ar8216_vtu_op(priv, AR8216_VTU_OP_FLUSH, 0);
}

static void
ar8216_vtu_load_vlan(struct ar8xxx_priv *priv, u32 vid, u32 port_mask)
{
	u32 op;

	op = AR8216_VTU_OP_LOAD | (vid << AR8216_VTU_VID_S);
	ar8216_vtu_op(priv, op, port_mask);
}

static int
ar8216_atu_flush(struct ar8xxx_priv *priv)
{
	int ret;

	ret = ar8216_wait_bit(priv, AR8216_REG_ATU_FUNC0, AR8216_ATU_ACTIVE, 0);
	if (!ret)
		ar8xxx_write(priv, AR8216_REG_ATU_FUNC0, AR8216_ATU_OP_FLUSH |
							 AR8216_ATU_ACTIVE);

	return ret;
}

static int
ar8216_atu_flush_port(struct ar8xxx_priv *priv, int port)
{
	u32 t;
	int ret;

	ret = ar8216_wait_bit(priv, AR8216_REG_ATU_FUNC0, AR8216_ATU_ACTIVE, 0);
	if (!ret) {
		t = (port << AR8216_ATU_PORT_NUM_S) | AR8216_ATU_OP_FLUSH_PORT;
		t |= AR8216_ATU_ACTIVE;
		ar8xxx_write(priv, AR8216_REG_ATU_FUNC0, t);
	}

	return ret;
}

static u32
ar8216_read_port_status(struct ar8xxx_priv *priv, int port)
{
	return ar8xxx_read(priv, AR8216_REG_PORT_STATUS(port));
}

static void
ar8216_setup_port(struct ar8xxx_priv *priv, int port, u32 members)
{
	u32 header;
	u32 egress, ingress;
	u32 pvid;

	if (priv->vlan) {
		pvid = priv->vlan_id[priv->pvid[port]];
		if (priv->vlan_tagged & (1 << port))
			egress = AR8216_OUT_ADD_VLAN;
		else
			egress = AR8216_OUT_STRIP_VLAN;
		ingress = AR8216_IN_SECURE;
	} else {
		pvid = port;
		egress = AR8216_OUT_KEEP;
		ingress = AR8216_IN_PORT_ONLY;
	}

	if (chip_is_ar8216(priv) && priv->vlan && port == AR8216_PORT_CPU)
		header = AR8216_PORT_CTRL_HEADER;
	else
		header = 0;

	ar8xxx_rmw(priv, AR8216_REG_PORT_CTRL(port),
		   AR8216_PORT_CTRL_LEARN | AR8216_PORT_CTRL_VLAN_MODE |
		   AR8216_PORT_CTRL_SINGLE_VLAN | AR8216_PORT_CTRL_STATE |
		   AR8216_PORT_CTRL_HEADER | AR8216_PORT_CTRL_LEARN_LOCK,
		   AR8216_PORT_CTRL_LEARN | header |
		   (egress << AR8216_PORT_CTRL_VLAN_MODE_S) |
		   (AR8216_PORT_STATE_FORWARD << AR8216_PORT_CTRL_STATE_S));

	ar8xxx_rmw(priv, AR8216_REG_PORT_VLAN(port),
		   AR8216_PORT_VLAN_DEST_PORTS | AR8216_PORT_VLAN_MODE |
		   AR8216_PORT_VLAN_DEFAULT_ID,
		   (members << AR8216_PORT_VLAN_DEST_PORTS_S) |
		   (ingress << AR8216_PORT_VLAN_MODE_S) |
		   (pvid << AR8216_PORT_VLAN_DEFAULT_ID_S));
}

static int
ar8216_hw_init(struct ar8xxx_priv *priv)
{
	if (priv->initialized)
		return 0;

	ar8xxx_phy_init(priv);

	priv->initialized = true;
	return 0;
}

static void
ar8216_init_globals(struct ar8xxx_priv *priv)
{
	/* standard atheros magic */
	ar8xxx_write(priv, 0x38, 0xc000050e);

	ar8xxx_rmw(priv, AR8216_REG_GLOBAL_CTRL,
		   AR8216_GCTRL_MTU, 1518 + 8 + 2);
}

static void
ar8216_init_port(struct ar8xxx_priv *priv, int port)
{
	/* Enable port learning and tx */
	ar8xxx_write(priv, AR8216_REG_PORT_CTRL(port),
		AR8216_PORT_CTRL_LEARN |
		(4 << AR8216_PORT_CTRL_STATE_S));

	ar8xxx_write(priv, AR8216_REG_PORT_VLAN(port), 0);

	if (port == AR8216_PORT_CPU) {
		ar8xxx_write(priv, AR8216_REG_PORT_STATUS(port),
			AR8216_PORT_STATUS_LINK_UP |
			(ar8xxx_has_gige(priv) ?
                                AR8216_PORT_SPEED_1000M : AR8216_PORT_SPEED_100M) |
			AR8216_PORT_STATUS_TXMAC |
			AR8216_PORT_STATUS_RXMAC |
			(chip_is_ar8316(priv) ? AR8216_PORT_STATUS_RXFLOW : 0) |
			(chip_is_ar8316(priv) ? AR8216_PORT_STATUS_TXFLOW : 0) |
			AR8216_PORT_STATUS_DUPLEX);
	} else {
		ar8xxx_write(priv, AR8216_REG_PORT_STATUS(port),
			AR8216_PORT_STATUS_LINK_AUTO);
	}
}

static void
ar8216_wait_atu_ready(struct ar8xxx_priv *priv, u16 r2, u16 r1)
{
	int timeout = 20;

	while (ar8xxx_mii_read32(priv, r2, r1) & AR8216_ATU_ACTIVE && --timeout) {
		udelay(10);
		cond_resched();
	}

	if (!timeout)
		pr_err("ar8216: timeout waiting for atu to become ready\n");
}

static void ar8216_get_arl_entry(struct ar8xxx_priv *priv,
				 struct arl_entry *a, u32 *status, enum arl_op op)
{
	struct mii_bus *bus = priv->mii_bus;
	u16 r2, page;
	u16 r1_func0, r1_func1, r1_func2;
	u32 t, val0, val1, val2;
	int i;

	split_addr(AR8216_REG_ATU_FUNC0, &r1_func0, &r2, &page);
	r2 |= 0x10;

	r1_func1 = (AR8216_REG_ATU_FUNC1 >> 1) & 0x1e;
	r1_func2 = (AR8216_REG_ATU_FUNC2 >> 1) & 0x1e;

	switch (op) {
	case AR8XXX_ARL_INITIALIZE:
		/* all ATU registers are on the same page
		* therefore set page only once
		*/
		bus->write(bus, 0x18, 0, page);
		wait_for_page_switch();

		ar8216_wait_atu_ready(priv, r2, r1_func0);

		ar8xxx_mii_write32(priv, r2, r1_func0, AR8216_ATU_OP_GET_NEXT);
		ar8xxx_mii_write32(priv, r2, r1_func1, 0);
		ar8xxx_mii_write32(priv, r2, r1_func2, 0);
		break;
	case AR8XXX_ARL_GET_NEXT:
		t = ar8xxx_mii_read32(priv, r2, r1_func0);
		t |= AR8216_ATU_ACTIVE;
		ar8xxx_mii_write32(priv, r2, r1_func0, t);
		ar8216_wait_atu_ready(priv, r2, r1_func0);

		val0 = ar8xxx_mii_read32(priv, r2, r1_func0);
		val1 = ar8xxx_mii_read32(priv, r2, r1_func1);
		val2 = ar8xxx_mii_read32(priv, r2, r1_func2);

		*status = (val2 & AR8216_ATU_STATUS) >> AR8216_ATU_STATUS_S;
		if (!*status)
			break;

		i = 0;
		t = AR8216_ATU_PORT0;
		while (!(val2 & t) && ++i < priv->dev.ports)
			t <<= 1;

		a->port = i;
		a->mac[0] = (val0 & AR8216_ATU_ADDR5) >> AR8216_ATU_ADDR5_S;
		a->mac[1] = (val0 & AR8216_ATU_ADDR4) >> AR8216_ATU_ADDR4_S;
		a->mac[2] = (val1 & AR8216_ATU_ADDR3) >> AR8216_ATU_ADDR3_S;
		a->mac[3] = (val1 & AR8216_ATU_ADDR2) >> AR8216_ATU_ADDR2_S;
		a->mac[4] = (val1 & AR8216_ATU_ADDR1) >> AR8216_ATU_ADDR1_S;
		a->mac[5] = (val1 & AR8216_ATU_ADDR0) >> AR8216_ATU_ADDR0_S;
		break;
	}
}

static void
ar8236_setup_port(struct ar8xxx_priv *priv, int port, u32 members)
{
	u32 egress, ingress;
	u32 pvid;

	if (priv->vlan) {
		pvid = priv->vlan_id[priv->pvid[port]];
		if (priv->vlan_tagged & (1 << port))
			egress = AR8216_OUT_ADD_VLAN;
		else
			egress = AR8216_OUT_STRIP_VLAN;
		ingress = AR8216_IN_SECURE;
	} else {
		pvid = port;
		egress = AR8216_OUT_KEEP;
		ingress = AR8216_IN_PORT_ONLY;
	}

	ar8xxx_rmw(priv, AR8216_REG_PORT_CTRL(port),
		   AR8216_PORT_CTRL_LEARN | AR8216_PORT_CTRL_VLAN_MODE |
		   AR8216_PORT_CTRL_SINGLE_VLAN | AR8216_PORT_CTRL_STATE |
		   AR8216_PORT_CTRL_HEADER | AR8216_PORT_CTRL_LEARN_LOCK,
		   AR8216_PORT_CTRL_LEARN |
		   (egress << AR8216_PORT_CTRL_VLAN_MODE_S) |
		   (AR8216_PORT_STATE_FORWARD << AR8216_PORT_CTRL_STATE_S));

	ar8xxx_rmw(priv, AR8236_REG_PORT_VLAN(port),
		   AR8236_PORT_VLAN_DEFAULT_ID,
		   (pvid << AR8236_PORT_VLAN_DEFAULT_ID_S));

	ar8xxx_rmw(priv, AR8236_REG_PORT_VLAN2(port),
		   AR8236_PORT_VLAN2_VLAN_MODE |
		   AR8236_PORT_VLAN2_MEMBER,
		   (ingress << AR8236_PORT_VLAN2_VLAN_MODE_S) |
		   (members << AR8236_PORT_VLAN2_MEMBER_S));
}

static void
ar8236_init_globals(struct ar8xxx_priv *priv)
{
	/* enable jumbo frames */
	ar8xxx_rmw(priv, AR8216_REG_GLOBAL_CTRL,
		   AR8316_GCTRL_MTU, 9018 + 8 + 2);

	/* enable cpu port to receive arp frames */
	ar8xxx_reg_set(priv, AR8216_REG_ATU_CTRL,
		   AR8236_ATU_CTRL_RES);

	/* enable cpu port to receive multicast and broadcast frames */
	ar8xxx_reg_set(priv, AR8216_REG_FLOOD_MASK,
		   AR8236_FM_CPU_BROADCAST_EN | AR8236_FM_CPU_BCAST_FWD_EN);

	/* Enable MIB counters */
	ar8xxx_rmw(priv, AR8216_REG_MIB_FUNC, AR8216_MIB_FUNC | AR8236_MIB_EN,
		   (AR8216_MIB_FUNC_NO_OP << AR8216_MIB_FUNC_S) |
		   AR8236_MIB_EN);
}

static int
ar8316_hw_init(struct ar8xxx_priv *priv)
{
	u32 val, newval;

	val = ar8xxx_read(priv, AR8316_REG_POSTRIP);

	if (priv->phy->interface == PHY_INTERFACE_MODE_RGMII) {
		if (priv->port4_phy) {
			/* value taken from Ubiquiti RouterStation Pro */
			newval = 0x81461bea;
			pr_info("ar8316: Using port 4 as PHY\n");
		} else {
			newval = 0x01261be2;
			pr_info("ar8316: Using port 4 as switch port\n");
		}
	} else if (priv->phy->interface == PHY_INTERFACE_MODE_GMII) {
		/* value taken from AVM Fritz!Box 7390 sources */
		newval = 0x010e5b71;
	} else {
		/* no known value for phy interface */
		pr_err("ar8316: unsupported mii mode: %d.\n",
		       priv->phy->interface);
		return -EINVAL;
	}

	if (val == newval)
		goto out;

	ar8xxx_write(priv, AR8316_REG_POSTRIP, newval);

	if (priv->port4_phy &&
	    priv->phy->interface == PHY_INTERFACE_MODE_RGMII) {
		/* work around for phy4 rgmii mode */
		ar8xxx_phy_dbg_write(priv, 4, 0x12, 0x480c);
		/* rx delay */
		ar8xxx_phy_dbg_write(priv, 4, 0x0, 0x824e);
		/* tx delay */
		ar8xxx_phy_dbg_write(priv, 4, 0x5, 0x3d47);
		msleep(1000);
	}

	ar8xxx_phy_init(priv);

out:
	priv->initialized = true;
	return 0;
}

static void
ar8316_init_globals(struct ar8xxx_priv *priv)
{
	/* standard atheros magic */
	ar8xxx_write(priv, 0x38, 0xc000050e);

	/* enable cpu port to receive multicast and broadcast frames */
	ar8xxx_write(priv, AR8216_REG_FLOOD_MASK, 0x003f003f);

	/* enable jumbo frames */
	ar8xxx_rmw(priv, AR8216_REG_GLOBAL_CTRL,
		   AR8316_GCTRL_MTU, 9018 + 8 + 2);

	/* Enable MIB counters */
	ar8xxx_rmw(priv, AR8216_REG_MIB_FUNC, AR8216_MIB_FUNC | AR8236_MIB_EN,
		   (AR8216_MIB_FUNC_NO_OP << AR8216_MIB_FUNC_S) |
		   AR8236_MIB_EN);
}

int
ar8xxx_sw_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
		   struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	priv->vlan = !!val->value.i;
	return 0;
}

int
ar8xxx_sw_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
		   struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->vlan;
	return 0;
}


int
ar8xxx_sw_set_pvid(struct switch_dev *dev, int port, int vlan)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	/* make sure no invalid PVIDs get set */

	if (vlan < 0 || vlan >= dev->vlans ||
	    port < 0 || port >= AR8X16_MAX_PORTS)
		return -EINVAL;

	priv->pvid[port] = vlan;
	return 0;
}

int
ar8xxx_sw_get_pvid(struct switch_dev *dev, int port, int *vlan)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	if (port < 0 || port >= AR8X16_MAX_PORTS)
		return -EINVAL;

	*vlan = priv->pvid[port];
	return 0;
}

static int
ar8xxx_sw_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
		  struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	if (val->port_vlan >= AR8X16_MAX_VLANS)
		return -EINVAL;

	priv->vlan_id[val->port_vlan] = val->value.i;
	return 0;
}

static int
ar8xxx_sw_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
		  struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->vlan_id[val->port_vlan];
	return 0;
}

int
ar8xxx_sw_get_port_link(struct switch_dev *dev, int port,
			struct switch_port_link *link)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	ar8216_read_port_link(priv, port, link);
	return 0;
}

static int
ar8xxx_sw_get_ports(struct switch_dev *dev, struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	u8 ports;
	int i;

	if (val->port_vlan >= AR8X16_MAX_VLANS)
		return -EINVAL;

	ports = priv->vlan_table[val->port_vlan];
	val->len = 0;
	for (i = 0; i < dev->ports; i++) {
		struct switch_port *p;

		if (!(ports & (1 << i)))
			continue;

		p = &val->value.ports[val->len++];
		p->id = i;
		if (priv->vlan_tagged & (1 << i))
			p->flags = (1 << SWITCH_PORT_FLAG_TAGGED);
		else
			p->flags = 0;
	}
	return 0;
}

static int
ar8xxx_sw_set_ports(struct switch_dev *dev, struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	u8 *vt = &priv->vlan_table[val->port_vlan];
	int i, j;

	*vt = 0;
	for (i = 0; i < val->len; i++) {
		struct switch_port *p = &val->value.ports[i];

		if (p->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
			priv->vlan_tagged |= (1 << p->id);
		} else {
			priv->vlan_tagged &= ~(1 << p->id);
			priv->pvid[p->id] = val->port_vlan;

			/* make sure that an untagged port does not
			 * appear in other vlans */
			for (j = 0; j < AR8X16_MAX_VLANS; j++) {
				if (j == val->port_vlan)
					continue;
				priv->vlan_table[j] &= ~(1 << p->id);
			}
		}

		*vt |= 1 << p->id;
	}
	return 0;
}

static void
ar8216_set_mirror_regs(struct ar8xxx_priv *priv)
{
	int port;

	/* reset all mirror registers */
	ar8xxx_rmw(priv, AR8216_REG_GLOBAL_CPUPORT,
		   AR8216_GLOBAL_CPUPORT_MIRROR_PORT,
		   (0xF << AR8216_GLOBAL_CPUPORT_MIRROR_PORT_S));
	for (port = 0; port < AR8216_NUM_PORTS; port++) {
		ar8xxx_reg_clear(priv, AR8216_REG_PORT_CTRL(port),
			   AR8216_PORT_CTRL_MIRROR_RX);

		ar8xxx_reg_clear(priv, AR8216_REG_PORT_CTRL(port),
			   AR8216_PORT_CTRL_MIRROR_TX);
	}

	/* now enable mirroring if necessary */
	if (priv->source_port >= AR8216_NUM_PORTS ||
	    priv->monitor_port >= AR8216_NUM_PORTS ||
	    priv->source_port == priv->monitor_port) {
		return;
	}

	ar8xxx_rmw(priv, AR8216_REG_GLOBAL_CPUPORT,
		   AR8216_GLOBAL_CPUPORT_MIRROR_PORT,
		   (priv->monitor_port << AR8216_GLOBAL_CPUPORT_MIRROR_PORT_S));

	if (priv->mirror_rx)
		ar8xxx_reg_set(priv, AR8216_REG_PORT_CTRL(priv->source_port),
			   AR8216_PORT_CTRL_MIRROR_RX);

	if (priv->mirror_tx)
		ar8xxx_reg_set(priv, AR8216_REG_PORT_CTRL(priv->source_port),
			   AR8216_PORT_CTRL_MIRROR_TX);
}

static inline u32
ar8xxx_age_time_val(int age_time)
{
	return (age_time + AR8XXX_REG_ARL_CTRL_AGE_TIME_SECS / 2) /
	       AR8XXX_REG_ARL_CTRL_AGE_TIME_SECS;
}

static inline void
ar8xxx_set_age_time(struct ar8xxx_priv *priv, int reg)
{
	u32 age_time = ar8xxx_age_time_val(priv->arl_age_time);
	ar8xxx_rmw(priv, reg, AR8216_ATU_CTRL_AGE_TIME, age_time << AR8216_ATU_CTRL_AGE_TIME_S);
}

int
ar8xxx_sw_hw_apply(struct switch_dev *dev)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	const struct ar8xxx_chip *chip = priv->chip;
	u8 portmask[AR8X16_MAX_PORTS];
	int i, j;

	mutex_lock(&priv->reg_mutex);
	/* flush all vlan translation unit entries */
	priv->chip->vtu_flush(priv);

	memset(portmask, 0, sizeof(portmask));
	if (!priv->init) {
		/* calculate the port destination masks and load vlans
		 * into the vlan translation unit */
		for (j = 0; j < AR8X16_MAX_VLANS; j++) {
			u8 vp = priv->vlan_table[j];

			if (!vp)
				continue;

			for (i = 0; i < dev->ports; i++) {
				u8 mask = (1 << i);
				if (vp & mask)
					portmask[i] |= vp & ~mask;
			}

			chip->vtu_load_vlan(priv, priv->vlan_id[j],
					    priv->vlan_table[j]);
		}
	} else {
		/* vlan disabled:
		 * isolate all ports, but connect them to the cpu port */
		for (i = 0; i < dev->ports; i++) {
			if (i == AR8216_PORT_CPU)
				continue;

			portmask[i] = 1 << AR8216_PORT_CPU;
			portmask[AR8216_PORT_CPU] |= (1 << i);
		}
	}

	/* update the port destination mask registers and tag settings */
	for (i = 0; i < dev->ports; i++) {
		chip->setup_port(priv, i, portmask[i]);
	}

	chip->set_mirror_regs(priv);

	/* set age time */
	if (chip->reg_arl_ctrl)
		ar8xxx_set_age_time(priv, chip->reg_arl_ctrl);

	mutex_unlock(&priv->reg_mutex);
	return 0;
}

int
ar8xxx_sw_reset_switch(struct switch_dev *dev)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	const struct ar8xxx_chip *chip = priv->chip;
	int i;

	mutex_lock(&priv->reg_mutex);
	memset(&priv->vlan, 0, sizeof(struct ar8xxx_priv) -
		offsetof(struct ar8xxx_priv, vlan));

	for (i = 0; i < AR8X16_MAX_VLANS; i++)
		priv->vlan_id[i] = i;

	/* Configure all ports */
	for (i = 0; i < dev->ports; i++)
		chip->init_port(priv, i);

	priv->mirror_rx = false;
	priv->mirror_tx = false;
	priv->source_port = 0;
	priv->monitor_port = 0;
	priv->arl_age_time = AR8XXX_DEFAULT_ARL_AGE_TIME;

	chip->init_globals(priv);
	chip->atu_flush(priv);

	mutex_unlock(&priv->reg_mutex);

	return chip->sw_hw_apply(dev);
}

int
ar8xxx_sw_set_reset_mibs(struct switch_dev *dev,
			 const struct switch_attr *attr,
			 struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	unsigned int len;
	int ret;

	if (!ar8xxx_has_mib_counters(priv))
		return -EOPNOTSUPP;

	mutex_lock(&priv->mib_lock);

	len = priv->dev.ports * priv->chip->num_mibs *
	      sizeof(*priv->mib_stats);
	memset(priv->mib_stats, '\0', len);
	ret = ar8xxx_mib_flush(priv);
	if (ret)
		goto unlock;

	ret = 0;

unlock:
	mutex_unlock(&priv->mib_lock);
	return ret;
}

int
ar8xxx_sw_set_mirror_rx_enable(struct switch_dev *dev,
			       const struct switch_attr *attr,
			       struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	mutex_lock(&priv->reg_mutex);
	priv->mirror_rx = !!val->value.i;
	priv->chip->set_mirror_regs(priv);
	mutex_unlock(&priv->reg_mutex);

	return 0;
}

int
ar8xxx_sw_get_mirror_rx_enable(struct switch_dev *dev,
			       const struct switch_attr *attr,
			       struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->mirror_rx;
	return 0;
}

int
ar8xxx_sw_set_mirror_tx_enable(struct switch_dev *dev,
			       const struct switch_attr *attr,
			       struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	mutex_lock(&priv->reg_mutex);
	priv->mirror_tx = !!val->value.i;
	priv->chip->set_mirror_regs(priv);
	mutex_unlock(&priv->reg_mutex);

	return 0;
}

int
ar8xxx_sw_get_mirror_tx_enable(struct switch_dev *dev,
			       const struct switch_attr *attr,
			       struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->mirror_tx;
	return 0;
}

int
ar8xxx_sw_set_mirror_monitor_port(struct switch_dev *dev,
				  const struct switch_attr *attr,
				  struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	mutex_lock(&priv->reg_mutex);
	priv->monitor_port = val->value.i;
	priv->chip->set_mirror_regs(priv);
	mutex_unlock(&priv->reg_mutex);

	return 0;
}

int
ar8xxx_sw_get_mirror_monitor_port(struct switch_dev *dev,
				  const struct switch_attr *attr,
				  struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->monitor_port;
	return 0;
}

int
ar8xxx_sw_set_mirror_source_port(struct switch_dev *dev,
				 const struct switch_attr *attr,
				 struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);

	mutex_lock(&priv->reg_mutex);
	priv->source_port = val->value.i;
	priv->chip->set_mirror_regs(priv);
	mutex_unlock(&priv->reg_mutex);

	return 0;
}

int
ar8xxx_sw_get_mirror_source_port(struct switch_dev *dev,
				 const struct switch_attr *attr,
				 struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->source_port;
	return 0;
}

int
ar8xxx_sw_set_port_reset_mib(struct switch_dev *dev,
			     const struct switch_attr *attr,
			     struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	int port;
	int ret;

	if (!ar8xxx_has_mib_counters(priv))
		return -EOPNOTSUPP;

	port = val->port_vlan;
	if (port >= dev->ports)
		return -EINVAL;

	mutex_lock(&priv->mib_lock);
	ret = ar8xxx_mib_capture(priv);
	if (ret)
		goto unlock;

	ar8xxx_mib_fetch_port_stat(priv, port, true);

	ret = 0;

unlock:
	mutex_unlock(&priv->mib_lock);
	return ret;
}

static void
ar8xxx_byte_to_str(char *buf, int len, u64 byte)
{
	unsigned long b;
	const char *unit;

	if (byte >= 0x40000000) { /* 1 GiB */
		b = byte * 10 / 0x40000000;
		unit = "GiB";
	} else if (byte >= 0x100000) { /* 1 MiB */
		b = byte * 10 / 0x100000;
		unit = "MiB";
	} else if (byte >= 0x400) { /* 1 KiB */
		b = byte * 10 / 0x400;
		unit = "KiB";
	} else {
		b = byte;
		unit = "Byte";
	}
	if (strcmp(unit, "Byte"))
		snprintf(buf, len, "%lu.%lu %s", b / 10, b % 10, unit);
	else
		snprintf(buf, len, "%lu %s", b, unit);
}

int
ar8xxx_sw_get_port_mib(struct switch_dev *dev,
		       const struct switch_attr *attr,
		       struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	const struct ar8xxx_chip *chip = priv->chip;
	u64 *mib_stats, mib_data;
	unsigned int port;
	int ret;
	char *buf = priv->buf;
	char buf1[64];
	const char *mib_name;
	int i, len = 0;
	bool mib_stats_empty = true;

	if (!ar8xxx_has_mib_counters(priv))
		return -EOPNOTSUPP;

	port = val->port_vlan;
	if (port >= dev->ports)
		return -EINVAL;

	mutex_lock(&priv->mib_lock);
	ret = ar8xxx_mib_capture(priv);
	if (ret)
		goto unlock;

	ar8xxx_mib_fetch_port_stat(priv, port, false);

	len += snprintf(buf + len, sizeof(priv->buf) - len,
			"MIB counters\n");

	mib_stats = &priv->mib_stats[port * chip->num_mibs];
	for (i = 0; i < chip->num_mibs; i++) {
		mib_name = chip->mib_decs[i].name;
		mib_data = mib_stats[i];
		len += snprintf(buf + len, sizeof(priv->buf) - len,
				"%-12s: %llu\n", mib_name, mib_data);
		if ((!strcmp(mib_name, "TxByte") ||
		    !strcmp(mib_name, "RxGoodByte")) &&
		    mib_data >= 1024) {
			ar8xxx_byte_to_str(buf1, sizeof(buf1), mib_data);
			--len; /* discard newline at the end of buf */
			len += snprintf(buf + len, sizeof(priv->buf) - len,
					" (%s)\n", buf1);
		}
		if (mib_stats_empty && mib_data)
			mib_stats_empty = false;
	}

	if (mib_stats_empty)
		len = snprintf(buf, sizeof(priv->buf), "No MIB data");

	val->value.s = buf;
	val->len = len;

	ret = 0;

unlock:
	mutex_unlock(&priv->mib_lock);
	return ret;
}

int
ar8xxx_sw_set_arl_age_time(struct switch_dev *dev, const struct switch_attr *attr,
			   struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	int age_time = val->value.i;
	u32 age_time_val;

	if (age_time < 0)
		return -EINVAL;

	age_time_val = ar8xxx_age_time_val(age_time);
	if (age_time_val == 0 || age_time_val > 0xffff)
		return -EINVAL;

	priv->arl_age_time = age_time;
	return 0;
}

int
ar8xxx_sw_get_arl_age_time(struct switch_dev *dev, const struct switch_attr *attr,
                   struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	val->value.i = priv->arl_age_time;
	return 0;
}

int
ar8xxx_sw_get_arl_table(struct switch_dev *dev,
			const struct switch_attr *attr,
			struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	struct mii_bus *bus = priv->mii_bus;
	const struct ar8xxx_chip *chip = priv->chip;
	char *buf = priv->arl_buf;
	int i, j, k, len = 0;
	struct arl_entry *a, *a1;
	u32 status;

	if (!chip->get_arl_entry)
		return -EOPNOTSUPP;

	mutex_lock(&priv->reg_mutex);
	mutex_lock(&bus->mdio_lock);

	chip->get_arl_entry(priv, NULL, NULL, AR8XXX_ARL_INITIALIZE);

	for(i = 0; i < AR8XXX_NUM_ARL_RECORDS; ++i) {
		a = &priv->arl_table[i];
		duplicate:
		chip->get_arl_entry(priv, a, &status, AR8XXX_ARL_GET_NEXT);

		if (!status)
			break;

		/* avoid duplicates
		 * ARL table can include multiple valid entries
		 * per MAC, just with differing status codes
		 */
		for (j = 0; j < i; ++j) {
			a1 = &priv->arl_table[j];
			if (a->port == a1->port && !memcmp(a->mac, a1->mac, sizeof(a->mac)))
				goto duplicate;
		}
	}

	mutex_unlock(&bus->mdio_lock);

	len += snprintf(buf + len, sizeof(priv->arl_buf) - len,
                        "address resolution table\n");

	if (i == AR8XXX_NUM_ARL_RECORDS)
		len += snprintf(buf + len, sizeof(priv->arl_buf) - len,
				"Too many entries found, displaying the first %d only!\n",
				AR8XXX_NUM_ARL_RECORDS);

	for (j = 0; j < priv->dev.ports; ++j) {
		for (k = 0; k < i; ++k) {
			a = &priv->arl_table[k];
			if (a->port != j)
				continue;
			len += snprintf(buf + len, sizeof(priv->arl_buf) - len,
					"Port %d: MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
					j,
					a->mac[5], a->mac[4], a->mac[3],
					a->mac[2], a->mac[1], a->mac[0]);
		}
	}

	val->value.s = buf;
	val->len = len;

	mutex_unlock(&priv->reg_mutex);

	return 0;
}

int
ar8xxx_sw_set_flush_arl_table(struct switch_dev *dev,
			      const struct switch_attr *attr,
			      struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	int ret;

	mutex_lock(&priv->reg_mutex);
	ret = priv->chip->atu_flush(priv);
	mutex_unlock(&priv->reg_mutex);

	return ret;
}

int
ar8xxx_sw_set_flush_port_arl_table(struct switch_dev *dev,
				   const struct switch_attr *attr,
				   struct switch_val *val)
{
	struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
	int port, ret;

	port = val->port_vlan;
	if (port >= dev->ports)
		return -EINVAL;

	mutex_lock(&priv->reg_mutex);
	ret = priv->chip->atu_flush_port(priv, port);
	mutex_unlock(&priv->reg_mutex);

	return ret;
}

static const struct switch_attr ar8xxx_sw_attr_globals[] = {
	{
		.type = SWITCH_TYPE_INT,
		.name = "enable_vlan",
		.description = "Enable VLAN mode",
		.set = ar8xxx_sw_set_vlan,
		.get = ar8xxx_sw_get_vlan,
		.max = 1
	},
	{
		.type = SWITCH_TYPE_NOVAL,
		.name = "reset_mibs",
		.description = "Reset all MIB counters",
		.set = ar8xxx_sw_set_reset_mibs,
	},
	{
		.type = SWITCH_TYPE_INT,
		.name = "enable_mirror_rx",
		.description = "Enable mirroring of RX packets",
		.set = ar8xxx_sw_set_mirror_rx_enable,
		.get = ar8xxx_sw_get_mirror_rx_enable,
		.max = 1
	},
	{
		.type = SWITCH_TYPE_INT,
		.name = "enable_mirror_tx",
		.description = "Enable mirroring of TX packets",
		.set = ar8xxx_sw_set_mirror_tx_enable,
		.get = ar8xxx_sw_get_mirror_tx_enable,
		.max = 1
	},
	{
		.type = SWITCH_TYPE_INT,
		.name = "mirror_monitor_port",
		.description = "Mirror monitor port",
		.set = ar8xxx_sw_set_mirror_monitor_port,
		.get = ar8xxx_sw_get_mirror_monitor_port,
		.max = AR8216_NUM_PORTS - 1
	},
	{
		.type = SWITCH_TYPE_INT,
		.name = "mirror_source_port",
		.description = "Mirror source port",
		.set = ar8xxx_sw_set_mirror_source_port,
		.get = ar8xxx_sw_get_mirror_source_port,
		.max = AR8216_NUM_PORTS - 1
 	},
	{
		.type = SWITCH_TYPE_STRING,
		.name = "arl_table",
		.description = "Get ARL table",
		.set = NULL,
		.get = ar8xxx_sw_get_arl_table,
	},
	{
		.type = SWITCH_TYPE_NOVAL,
		.name = "flush_arl_table",
		.description = "Flush ARL table",
		.set = ar8xxx_sw_set_flush_arl_table,
	},
};

const struct switch_attr ar8xxx_sw_attr_port[] = {
	{
		.type = SWITCH_TYPE_NOVAL,
		.name = "reset_mib",
		.description = "Reset single port MIB counters",
		.set = ar8xxx_sw_set_port_reset_mib,
	},
	{
		.type = SWITCH_TYPE_STRING,
		.name = "mib",
		.description = "Get port's MIB counters",
		.set = NULL,
		.get = ar8xxx_sw_get_port_mib,
	},
	{
		.type = SWITCH_TYPE_NOVAL,
		.name = "flush_arl_table",
		.description = "Flush port's ARL table entries",
		.set = ar8xxx_sw_set_flush_port_arl_table,
	},
};

const struct switch_attr ar8xxx_sw_attr_vlan[1] = {
	{
		.type = SWITCH_TYPE_INT,
		.name = "vid",
		.description = "VLAN ID (0-4094)",
		.set = ar8xxx_sw_set_vid,
		.get = ar8xxx_sw_get_vid,
		.max = 4094,
	},
};

static const struct switch_dev_ops ar8xxx_sw_ops = {
	.attr_global = {
		.attr = ar8xxx_sw_attr_globals,
		.n_attr = ARRAY_SIZE(ar8xxx_sw_attr_globals),
	},
	.attr_port = {
		.attr = ar8xxx_sw_attr_port,
		.n_attr = ARRAY_SIZE(ar8xxx_sw_attr_port),
	},
	.attr_vlan = {
		.attr = ar8xxx_sw_attr_vlan,
		.n_attr = ARRAY_SIZE(ar8xxx_sw_attr_vlan),
	},
	.get_port_pvid = ar8xxx_sw_get_pvid,
	.set_port_pvid = ar8xxx_sw_set_pvid,
	.get_vlan_ports = ar8xxx_sw_get_ports,
	.set_vlan_ports = ar8xxx_sw_set_ports,
	.apply_config = ar8xxx_sw_hw_apply,
	.reset_switch = ar8xxx_sw_reset_switch,
	.get_port_link = ar8xxx_sw_get_port_link,
/* The following op is disabled as it hogs the CPU and degrades performance.
   An implementation has been attempted in 4d8a66d but reading MIB data is slow
   on ar8xxx switches.

   The high CPU load has been traced down to the ar8xxx_reg_wait() call in
   ar8xxx_mib_op(), which has to usleep_range() till the MIB busy flag set by
   the request to update the MIB counter is cleared. */
#if 0
	.get_port_stats = ar8xxx_sw_get_port_stats,
#endif
};

static const struct ar8xxx_chip ar8216_chip = {
	.caps = AR8XXX_CAP_MIB_COUNTERS,

	.reg_port_stats_start = 0x19000,
	.reg_port_stats_length = 0xa0,
	.reg_arl_ctrl = AR8216_REG_ATU_CTRL,

	.name = "Atheros AR8216",
	.ports = AR8216_NUM_PORTS,
	.vlans = AR8216_NUM_VLANS,
	.swops = &ar8xxx_sw_ops,

	.hw_init = ar8216_hw_init,
	.init_globals = ar8216_init_globals,
	.init_port = ar8216_init_port,
	.setup_port = ar8216_setup_port,
	.read_port_status = ar8216_read_port_status,
	.atu_flush = ar8216_atu_flush,
	.atu_flush_port = ar8216_atu_flush_port,
	.vtu_flush = ar8216_vtu_flush,
	.vtu_load_vlan = ar8216_vtu_load_vlan,
	.set_mirror_regs = ar8216_set_mirror_regs,
	.get_arl_entry = ar8216_get_arl_entry,
	.sw_hw_apply = ar8xxx_sw_hw_apply,

	.num_mibs = ARRAY_SIZE(ar8216_mibs),
	.mib_decs = ar8216_mibs,
	.mib_func = AR8216_REG_MIB_FUNC
};

static const struct ar8xxx_chip ar8236_chip = {
	.caps = AR8XXX_CAP_MIB_COUNTERS,

	.reg_port_stats_start = 0x20000,
	.reg_port_stats_length = 0x100,
	.reg_arl_ctrl = AR8216_REG_ATU_CTRL,

	.name = "Atheros AR8236",
	.ports = AR8216_NUM_PORTS,
	.vlans = AR8216_NUM_VLANS,
	.swops = &ar8xxx_sw_ops,

	.hw_init = ar8216_hw_init,
	.init_globals = ar8236_init_globals,
	.init_port = ar8216_init_port,
	.setup_port = ar8236_setup_port,
	.read_port_status = ar8216_read_port_status,
	.atu_flush = ar8216_atu_flush,
	.atu_flush_port = ar8216_atu_flush_port,
	.vtu_flush = ar8216_vtu_flush,
	.vtu_load_vlan = ar8216_vtu_load_vlan,
	.set_mirror_regs = ar8216_set_mirror_regs,
	.get_arl_entry = ar8216_get_arl_entry,
	.sw_hw_apply = ar8xxx_sw_hw_apply,

	.num_mibs = ARRAY_SIZE(ar8236_mibs),
	.mib_decs = ar8236_mibs,
	.mib_func = AR8216_REG_MIB_FUNC
};

static const struct ar8xxx_chip ar8316_chip = {
	.caps = AR8XXX_CAP_GIGE | AR8XXX_CAP_MIB_COUNTERS,

	.reg_port_stats_start = 0x20000,
	.reg_port_stats_length = 0x100,
	.reg_arl_ctrl = AR8216_REG_ATU_CTRL,

	.name = "Atheros AR8316",
	.ports = AR8216_NUM_PORTS,
	.vlans = AR8X16_MAX_VLANS,
	.swops = &ar8xxx_sw_ops,

	.hw_init = ar8316_hw_init,
	.init_globals = ar8316_init_globals,
	.init_port = ar8216_init_port,
	.setup_port = ar8216_setup_port,
	.read_port_status = ar8216_read_port_status,
	.atu_flush = ar8216_atu_flush,
	.atu_flush_port = ar8216_atu_flush_port,
	.vtu_flush = ar8216_vtu_flush,
	.vtu_load_vlan = ar8216_vtu_load_vlan,
	.set_mirror_regs = ar8216_set_mirror_regs,
	.get_arl_entry = ar8216_get_arl_entry,
	.sw_hw_apply = ar8xxx_sw_hw_apply,

	.num_mibs = ARRAY_SIZE(ar8236_mibs),
	.mib_decs = ar8236_mibs,
	.mib_func = AR8216_REG_MIB_FUNC
};

static int
ar8xxx_id_chip(struct ar8xxx_priv *priv)
{
	u32 val;
	u16 id;
	int i;

	val = ar8xxx_read(priv, AR8216_REG_CTRL);
	if (val == ~0)
		return -ENODEV;

	id = val & (AR8216_CTRL_REVISION | AR8216_CTRL_VERSION);
	for (i = 0; i < AR8X16_PROBE_RETRIES; i++) {
		u16 t;

		val = ar8xxx_read(priv, AR8216_REG_CTRL);
		if (val == ~0)
			return -ENODEV;

		t = val & (AR8216_CTRL_REVISION | AR8216_CTRL_VERSION);
		if (t != id)
			return -ENODEV;
	}

	priv->chip_ver = (id & AR8216_CTRL_VERSION) >> AR8216_CTRL_VERSION_S;
	priv->chip_rev = (id & AR8216_CTRL_REVISION);

	switch (priv->chip_ver) {
	case AR8XXX_VER_AR8216:
		priv->chip = &ar8216_chip;
		break;
	case AR8XXX_VER_AR8236:
		priv->chip = &ar8236_chip;
		break;
	case AR8XXX_VER_AR8316:
		priv->chip = &ar8316_chip;
		break;
	case AR8XXX_VER_AR8327:
		priv->chip = &ar8327_chip;
		break;
	case AR8XXX_VER_AR8337:
		priv->chip = &ar8337_chip;
		break;
	default:
		pr_err("ar8216: Unknown Atheros device [ver=%d, rev=%d]\n",
		       priv->chip_ver, priv->chip_rev);

		return -ENODEV;
	}

	return 0;
}

static void
ar8xxx_mib_work_func(struct work_struct *work)
{
	struct ar8xxx_priv *priv;
	int err;

	priv = container_of(work, struct ar8xxx_priv, mib_work.work);

	mutex_lock(&priv->mib_lock);

	err = ar8xxx_mib_capture(priv);
	if (err)
		goto next_port;

	ar8xxx_mib_fetch_port_stat(priv, priv->mib_next_port, false);

next_port:
	priv->mib_next_port++;
	if (priv->mib_next_port >= priv->dev.ports)
		priv->mib_next_port = 0;

	mutex_unlock(&priv->mib_lock);
	schedule_delayed_work(&priv->mib_work,
			      msecs_to_jiffies(AR8XXX_MIB_WORK_DELAY));
}

static int
ar8xxx_mib_init(struct ar8xxx_priv *priv)
{
	unsigned int len;

	if (!ar8xxx_has_mib_counters(priv))
		return 0;

	BUG_ON(!priv->chip->mib_decs || !priv->chip->num_mibs);

	len = priv->dev.ports * priv->chip->num_mibs *
	      sizeof(*priv->mib_stats);
	priv->mib_stats = kzalloc(len, GFP_KERNEL);

	if (!priv->mib_stats)
		return -ENOMEM;

	return 0;
}

static void
ar8xxx_mib_start(struct ar8xxx_priv *priv)
{
	if (!ar8xxx_has_mib_counters(priv))
		return;

	schedule_delayed_work(&priv->mib_work,
			      msecs_to_jiffies(AR8XXX_MIB_WORK_DELAY));
}

static void
ar8xxx_mib_stop(struct ar8xxx_priv *priv)
{
	if (!ar8xxx_has_mib_counters(priv))
		return;

	cancel_delayed_work_sync(&priv->mib_work);
}

static struct ar8xxx_priv *
ar8xxx_create(void)
{
	struct ar8xxx_priv *priv;

	priv = kzalloc(sizeof(struct ar8xxx_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

	mutex_init(&priv->reg_mutex);
	mutex_init(&priv->mib_lock);
	INIT_DELAYED_WORK(&priv->mib_work, ar8xxx_mib_work_func);

	return priv;
}

static void
ar8xxx_free(struct ar8xxx_priv *priv)
{
	if (priv->chip && priv->chip->cleanup)
		priv->chip->cleanup(priv);

	kfree(priv->chip_data);
	kfree(priv->mib_stats);
	kfree(priv);
}

static int
ar8xxx_probe_switch(struct ar8xxx_priv *priv)
{
	const struct ar8xxx_chip *chip;
	struct switch_dev *swdev;
	int ret;

	ret = ar8xxx_id_chip(priv);
	if (ret)
		return ret;

	chip = priv->chip;

	swdev = &priv->dev;
	swdev->cpu_port = AR8216_PORT_CPU;
	swdev->name = chip->name;
	swdev->vlans = chip->vlans;
	swdev->ports = chip->ports;
	swdev->ops = chip->swops;

	ret = ar8xxx_mib_init(priv);
	if (ret)
		return ret;

	return 0;
}

static int
ar8xxx_start(struct ar8xxx_priv *priv)
{
	int ret;

	priv->init = true;

	ret = priv->chip->hw_init(priv);
	if (ret)
		return ret;

	ret = ar8xxx_sw_reset_switch(&priv->dev);
	if (ret)
		return ret;

	priv->init = false;

	ar8xxx_mib_start(priv);

	return 0;
}

static int
ar8xxx_phy_config_init(struct phy_device *phydev)
{
	struct ar8xxx_priv *priv = phydev->priv;
	struct net_device *dev = phydev->attached_dev;
	int ret;

	if (WARN_ON(!priv))
		return -ENODEV;

	if (priv->chip->config_at_probe)
		return ar8xxx_phy_check_aneg(phydev);

	priv->phy = phydev;

	if (phydev->mdio.addr != 0) {
		if (chip_is_ar8316(priv)) {
			/* switch device has been initialized, reinit */
			priv->dev.ports = (AR8216_NUM_PORTS - 1);
			priv->initialized = false;
			priv->port4_phy = true;
			ar8316_hw_init(priv);
			return 0;
		}

		return 0;
	}

	ret = ar8xxx_start(priv);
	if (ret)
		return ret;

	/* VID fixup only needed on ar8216 */
	if (chip_is_ar8216(priv)) {
		dev->phy_ptr = priv;
		dev->priv_flags |= IFF_NO_IP_ALIGN;
		dev->eth_mangle_rx = ar8216_mangle_rx;
		dev->eth_mangle_tx = ar8216_mangle_tx;
	}

	return 0;
}

static bool
ar8xxx_check_link_states(struct ar8xxx_priv *priv)
{
	bool link_new, changed = false;
	u32 status;
	int i;

	mutex_lock(&priv->reg_mutex);

	for (i = 0; i < priv->dev.ports; i++) {
		status = priv->chip->read_port_status(priv, i);
		link_new = !!(status & AR8216_PORT_STATUS_LINK_UP);
		if (link_new == priv->link_up[i])
			continue;

		priv->link_up[i] = link_new;
		changed = true;
		/* flush ARL entries for this port if it went down*/
		if (!link_new)
			priv->chip->atu_flush_port(priv, i);
		dev_info(&priv->phy->mdio.dev, "Port %d is %s\n",
			 i, link_new ? "up" : "down");
	}

	mutex_unlock(&priv->reg_mutex);

	return changed;
}

static int
ar8xxx_phy_read_status(struct phy_device *phydev)
{
	struct ar8xxx_priv *priv = phydev->priv;
	struct switch_port_link link;

	/* check for switch port link changes */
	if (phydev->state == PHY_CHANGELINK)
		ar8xxx_check_link_states(priv);

	if (phydev->mdio.addr != 0)
		return genphy_read_status(phydev);

	ar8216_read_port_link(priv, phydev->mdio.addr, &link);
	phydev->link = !!link.link;
	if (!phydev->link)
		return 0;

	switch (link.speed) {
	case SWITCH_PORT_SPEED_10:
		phydev->speed = SPEED_10;
		break;
	case SWITCH_PORT_SPEED_100:
		phydev->speed = SPEED_100;
		break;
	case SWITCH_PORT_SPEED_1000:
		phydev->speed = SPEED_1000;
		break;
	default:
		phydev->speed = 0;
	}
	phydev->duplex = link.duplex ? DUPLEX_FULL : DUPLEX_HALF;

	phydev->state = PHY_RUNNING;
	netif_carrier_on(phydev->attached_dev);
	phydev->adjust_link(phydev->attached_dev);

	return 0;
}

static int
ar8xxx_phy_config_aneg(struct phy_device *phydev)
{
	if (phydev->mdio.addr == 0)
		return 0;

	return genphy_config_aneg(phydev);
}

static const u32 ar8xxx_phy_ids[] = {
	0x004dd033,
	0x004dd034, /* AR8327 */
	0x004dd036, /* AR8337 */
	0x004dd041,
	0x004dd042,
	0x004dd043, /* AR8236 */
};

static bool
ar8xxx_phy_match(u32 phy_id)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ar8xxx_phy_ids); i++)
		if (phy_id == ar8xxx_phy_ids[i])
			return true;

	return false;
}

static bool
ar8xxx_is_possible(struct mii_bus *bus)
{
	unsigned int i, found_phys = 0;

	for (i = 0; i < 5; i++) {
		u32 phy_id;

		phy_id = mdiobus_read(bus, i, MII_PHYSID1) << 16;
		phy_id |= mdiobus_read(bus, i, MII_PHYSID2);
		if (ar8xxx_phy_match(phy_id)) {
			found_phys++;
		} else if (phy_id) {
			pr_debug("ar8xxx: unknown PHY at %s:%02x id:%08x\n",
				 dev_name(&bus->dev), i, phy_id);
		}
	}
	return !!found_phys;
}

static int
ar8xxx_phy_probe(struct phy_device *phydev)
{
	struct ar8xxx_priv *priv;
	struct switch_dev *swdev;
	int ret;

	/* skip PHYs at unused adresses */
	if (phydev->mdio.addr != 0 && phydev->mdio.addr != 4)
		return -ENODEV;

	if (!ar8xxx_is_possible(phydev->mdio.bus))
		return -ENODEV;

	mutex_lock(&ar8xxx_dev_list_lock);
	list_for_each_entry(priv, &ar8xxx_dev_list, list)
		if (priv->mii_bus == phydev->mdio.bus)
			goto found;

	priv = ar8xxx_create();
	if (priv == NULL) {
		ret = -ENOMEM;
		goto unlock;
	}

	priv->mii_bus = phydev->mdio.bus;

	ret = ar8xxx_probe_switch(priv);
	if (ret)
		goto free_priv;

	swdev = &priv->dev;
	swdev->alias = dev_name(&priv->mii_bus->dev);
	ret = register_switch(swdev, NULL);
	if (ret)
		goto free_priv;

	pr_info("%s: %s rev. %u switch registered on %s\n",
		swdev->devname, swdev->name, priv->chip_rev,
		dev_name(&priv->mii_bus->dev));

	list_add(&priv->list, &ar8xxx_dev_list);

found:
	priv->use_count++;

	if (phydev->mdio.addr == 0) {
		if (ar8xxx_has_gige(priv)) {
			phydev->supported = SUPPORTED_1000baseT_Full;
			phydev->advertising = ADVERTISED_1000baseT_Full;
		} else {
			phydev->supported = SUPPORTED_100baseT_Full;
			phydev->advertising = ADVERTISED_100baseT_Full;
		}

		if (priv->chip->config_at_probe) {
			priv->phy = phydev;

			ret = ar8xxx_start(priv);
			if (ret)
				goto err_unregister_switch;
		}
	} else {
		if (ar8xxx_has_gige(priv)) {
			phydev->supported |= SUPPORTED_1000baseT_Full;
			phydev->advertising |= ADVERTISED_1000baseT_Full;
		}
	}

	phydev->priv = priv;

	mutex_unlock(&ar8xxx_dev_list_lock);

	return 0;

err_unregister_switch:
	if (--priv->use_count)
		goto unlock;

	unregister_switch(&priv->dev);

free_priv:
	ar8xxx_free(priv);
unlock:
	mutex_unlock(&ar8xxx_dev_list_lock);
	return ret;
}

static void
ar8xxx_phy_detach(struct phy_device *phydev)
{
	struct net_device *dev = phydev->attached_dev;

	if (!dev)
		return;

	dev->phy_ptr = NULL;
	dev->priv_flags &= ~IFF_NO_IP_ALIGN;
	dev->eth_mangle_rx = NULL;
	dev->eth_mangle_tx = NULL;
}

static void
ar8xxx_phy_remove(struct phy_device *phydev)
{
	struct ar8xxx_priv *priv = phydev->priv;

	if (WARN_ON(!priv))
		return;

	phydev->priv = NULL;

	mutex_lock(&ar8xxx_dev_list_lock);

	if (--priv->use_count > 0) {
		mutex_unlock(&ar8xxx_dev_list_lock);
		return;
	}

	list_del(&priv->list);
	mutex_unlock(&ar8xxx_dev_list_lock);

	unregister_switch(&priv->dev);
	ar8xxx_mib_stop(priv);
	ar8xxx_free(priv);
}

static int
ar8xxx_phy_soft_reset(struct phy_device *phydev)
{
	/* we don't need an extra reset */
	return 0;
}

static struct phy_driver ar8xxx_phy_driver[] = {
	{
		.phy_id		= 0x004d0000,
		.name		= "Atheros AR8216/AR8236/AR8316",
		.phy_id_mask	= 0xffff0000,
		.features	= PHY_BASIC_FEATURES,
		.probe		= ar8xxx_phy_probe,
		.remove		= ar8xxx_phy_remove,
		.detach		= ar8xxx_phy_detach,
		.config_init	= ar8xxx_phy_config_init,
		.config_aneg	= ar8xxx_phy_config_aneg,
		.read_status	= ar8xxx_phy_read_status,
		.soft_reset	= ar8xxx_phy_soft_reset,
	}
};

module_phy_driver(ar8xxx_phy_driver);
MODULE_LICENSE("GPL");