path: root/target/linux/ar71xx/files-2.6.39/drivers/net/ag71xx/ag71xx_ar7240.c

/*
 *  Driver for the built-in ethernet switch of the Atheros AR7240 SoC
 *  Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org>
 *  Copyright (c) 2010 Felix Fietkau <nbd@openwrt.org>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 */

#include <linux/etherdevice.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/mii.h>
#include <linux/bitops.h>
#include <linux/switch.h>
#include "ag71xx.h"

#define BITM(_count)	(BIT(_count) - 1)
#define BITS(_shift, _count)	(BITM(_count) << _shift)

#define AR7240_REG_MASK_CTRL		0x00
#define AR7240_MASK_CTRL_REVISION_M	BITM(8)
#define AR7240_MASK_CTRL_VERSION_M	BITM(8)
#define AR7240_MASK_CTRL_VERSION_S	8
#define   AR7240_MASK_CTRL_VERSION_AR7240 0x01
#define   AR7240_MASK_CTRL_VERSION_AR934X 0x02
#define AR7240_MASK_CTRL_SOFT_RESET	BIT(31)

#define AR7240_REG_MAC_ADDR0		0x20
#define AR7240_REG_MAC_ADDR1		0x24

#define AR7240_REG_FLOOD_MASK		0x2c
#define AR7240_FLOOD_MASK_BROAD_TO_CPU	BIT(26)

#define AR7240_REG_GLOBAL_CTRL		0x30
#define AR7240_GLOBAL_CTRL_MTU_M	BITM(12)

#define AR7240_REG_VTU			0x0040
#define   AR7240_VTU_OP			BITM(3)
#define   AR7240_VTU_OP_NOOP		0x0
#define   AR7240_VTU_OP_FLUSH		0x1
#define   AR7240_VTU_OP_LOAD		0x2
#define   AR7240_VTU_OP_PURGE		0x3
#define   AR7240_VTU_OP_REMOVE_PORT	0x4
#define   AR7240_VTU_ACTIVE		BIT(3)
#define   AR7240_VTU_FULL		BIT(4)
#define   AR7240_VTU_PORT		BITS(8, 4)
#define   AR7240_VTU_PORT_S		8
#define   AR7240_VTU_VID		BITS(16, 12)
#define   AR7240_VTU_VID_S		16
#define   AR7240_VTU_PRIO		BITS(28, 3)
#define   AR7240_VTU_PRIO_S		28
#define   AR7240_VTU_PRIO_EN		BIT(31)

#define AR7240_REG_VTU_DATA		0x0044
#define   AR7240_VTUDATA_MEMBER		BITS(0, 10)
#define   AR7240_VTUDATA_VALID		BIT(11)

#define AR7240_REG_ATU			0x50
#define AR7240_ATU_FLUSH_ALL		0x1

#define AR7240_REG_AT_CTRL		0x5c
#define AR7240_AT_CTRL_AGE_TIME		BITS(0, 15)
#define AR7240_AT_CTRL_AGE_EN		BIT(17)
#define AR7240_AT_CTRL_LEARN_CHANGE	BIT(18)
#define AR7240_AT_CTRL_RESERVED		BIT(19)
#define AR7240_AT_CTRL_ARP_EN		BIT(20)

#define AR7240_REG_TAG_PRIORITY		0x70

#define AR7240_REG_SERVICE_TAG		0x74
#define AR7240_SERVICE_TAG_M		BITM(16)

#define AR7240_REG_CPU_PORT		0x78
#define AR7240_MIRROR_PORT_S		4
#define AR7240_CPU_PORT_EN		BIT(8)

#define AR7240_REG_MIB_FUNCTION0	0x80
#define AR7240_MIB_TIMER_M		BITM(16)
#define AR7240_MIB_AT_HALF_EN		BIT(16)
#define AR7240_MIB_BUSY			BIT(17)
#define AR7240_MIB_FUNC_S		24
#define AR7240_MIB_FUNC_NO_OP		0x0
#define AR7240_MIB_FUNC_FLUSH		0x1
#define AR7240_MIB_FUNC_CAPTURE		0x3

#define AR7240_REG_MDIO_CTRL		0x98
#define AR7240_MDIO_CTRL_DATA_M		BITM(16)
#define AR7240_MDIO_CTRL_REG_ADDR_S	16
#define AR7240_MDIO_CTRL_PHY_ADDR_S	21
#define AR7240_MDIO_CTRL_CMD_WRITE	0
#define AR7240_MDIO_CTRL_CMD_READ	BIT(27)
#define AR7240_MDIO_CTRL_MASTER_EN	BIT(30)
#define AR7240_MDIO_CTRL_BUSY		BIT(31)

#define AR7240_REG_PORT_BASE(_port)	(0x100 + (_port) * 0x100)

#define AR7240_REG_PORT_STATUS(_port)	(AR7240_REG_PORT_BASE((_port)) + 0x00)
#define AR7240_PORT_STATUS_SPEED_S	0
#define AR7240_PORT_STATUS_SPEED_M	BITM(2)
#define AR7240_PORT_STATUS_SPEED_10	0
#define AR7240_PORT_STATUS_SPEED_100	1
#define AR7240_PORT_STATUS_SPEED_1000	2
#define AR7240_PORT_STATUS_TXMAC	BIT(2)
#define AR7240_PORT_STATUS_RXMAC	BIT(3)
#define AR7240_PORT_STATUS_TXFLOW	BIT(4)
#define AR7240_PORT_STATUS_RXFLOW	BIT(5)
#define AR7240_PORT_STATUS_DUPLEX	BIT(6)
#define AR7240_PORT_STATUS_LINK_UP	BIT(8)
#define AR7240_PORT_STATUS_LINK_AUTO	BIT(9)
#define AR7240_PORT_STATUS_LINK_PAUSE	BIT(10)

#define AR7240_REG_PORT_CTRL(_port)	(AR7240_REG_PORT_BASE((_port)) + 0x04)
#define AR7240_PORT_CTRL_STATE_M	BITM(3)
#define	AR7240_PORT_CTRL_STATE_DISABLED	0
#define AR7240_PORT_CTRL_STATE_BLOCK	1
#define AR7240_PORT_CTRL_STATE_LISTEN	2
#define AR7240_PORT_CTRL_STATE_LEARN	3
#define AR7240_PORT_CTRL_STATE_FORWARD	4
#define AR7240_PORT_CTRL_LEARN_LOCK	BIT(7)
#define AR7240_PORT_CTRL_VLAN_MODE_S	8
#define AR7240_PORT_CTRL_VLAN_MODE_KEEP	0
#define AR7240_PORT_CTRL_VLAN_MODE_STRIP 1
#define AR7240_PORT_CTRL_VLAN_MODE_ADD	2
#define AR7240_PORT_CTRL_VLAN_MODE_DOUBLE_TAG 3
#define AR7240_PORT_CTRL_IGMP_SNOOP	BIT(10)
#define AR7240_PORT_CTRL_HEADER		BIT(11)
#define AR7240_PORT_CTRL_MAC_LOOP	BIT(12)
#define AR7240_PORT_CTRL_SINGLE_VLAN	BIT(13)
#define AR7240_PORT_CTRL_LEARN		BIT(14)
#define AR7240_PORT_CTRL_DOUBLE_TAG	BIT(15)
#define AR7240_PORT_CTRL_MIRROR_TX	BIT(16)
#define AR7240_PORT_CTRL_MIRROR_RX	BIT(17)

#define AR7240_REG_PORT_VLAN(_port)	(AR7240_REG_PORT_BASE((_port)) + 0x08)

#define AR7240_PORT_VLAN_DEFAULT_ID_S	0
#define AR7240_PORT_VLAN_DEST_PORTS_S	16
#define AR7240_PORT_VLAN_MODE_S		30
#define AR7240_PORT_VLAN_MODE_PORT_ONLY	0
#define AR7240_PORT_VLAN_MODE_PORT_FALLBACK	1
#define AR7240_PORT_VLAN_MODE_VLAN_ONLY	2
#define AR7240_PORT_VLAN_MODE_SECURE	3


#define AR7240_REG_STATS_BASE(_port)	(0x20000 + (_port) * 0x100)

#define AR7240_STATS_RXBROAD		0x00
#define AR7240_STATS_RXPAUSE		0x04
#define AR7240_STATS_RXMULTI		0x08
#define AR7240_STATS_RXFCSERR		0x0c
#define AR7240_STATS_RXALIGNERR		0x10
#define AR7240_STATS_RXRUNT		0x14
#define AR7240_STATS_RXFRAGMENT		0x18
#define AR7240_STATS_RX64BYTE		0x1c
#define AR7240_STATS_RX128BYTE		0x20
#define AR7240_STATS_RX256BYTE		0x24
#define AR7240_STATS_RX512BYTE		0x28
#define AR7240_STATS_RX1024BYTE		0x2c
#define AR7240_STATS_RX1518BYTE		0x30
#define AR7240_STATS_RXMAXBYTE		0x34
#define AR7240_STATS_RXTOOLONG		0x38
#define AR7240_STATS_RXGOODBYTE		0x3c
#define AR7240_STATS_RXBADBYTE		0x44
#define AR7240_STATS_RXOVERFLOW		0x4c
#define AR7240_STATS_FILTERED		0x50
#define AR7240_STATS_TXBROAD		0x54
#define AR7240_STATS_TXPAUSE		0x58
#define AR7240_STATS_TXMULTI		0x5c
#define AR7240_STATS_TXUNDERRUN		0x60
#define AR7240_STATS_TX64BYTE		0x64
#define AR7240_STATS_TX128BYTE		0x68
#define AR7240_STATS_TX256BYTE		0x6c
#define AR7240_STATS_TX512BYTE		0x70
#define AR7240_STATS_TX1024BYTE		0x74
#define AR7240_STATS_TX1518BYTE		0x78
#define AR7240_STATS_TXMAXBYTE		0x7c
#define AR7240_STATS_TXOVERSIZE		0x80
#define AR7240_STATS_TXBYTE		0x84
#define AR7240_STATS_TXCOLLISION	0x8c
#define AR7240_STATS_TXABORTCOL		0x90
#define AR7240_STATS_TXMULTICOL		0x94
#define AR7240_STATS_TXSINGLECOL	0x98
#define AR7240_STATS_TXEXCDEFER		0x9c
#define AR7240_STATS_TXDEFER		0xa0
#define AR7240_STATS_TXLATECOL		0xa4

#define AR7240_PORT_CPU		0
#define AR7240_NUM_PORTS	6
#define AR7240_NUM_PHYS		5

#define AR7240_PHY_ID1		0x004d
#define AR7240_PHY_ID2		0xd041

#define AR934X_PHY_ID1		0x004d
#define AR934X_PHY_ID2		0xd042

#define AR7240_MAX_VLANS	16

#define AR934X_REG_OPER_MODE0		0x04
#define   AR934X_OPER_MODE0_MAC_GMII_EN	BIT(6)
#define   AR934X_OPER_MODE0_PHY_MII_EN	BIT(10)

#define AR934X_REG_OPER_MODE1		0x08
#define   AR934X_REG_OPER_MODE1_PHY4_MII_EN	BIT(28)

#define AR934X_REG_PORT_BASE(_port)	(0x100 + (_port) * 0x100)

#define AR934X_REG_PORT_VLAN1(_port)	(AR934X_REG_PORT_BASE((_port)) + 0x08)
#define   AR934X_PORT_VLAN1_DEFAULT_SVID_S		0
#define   AR934X_PORT_VLAN1_FORCE_DEFAULT_VID_EN 	BIT(12)
#define   AR934X_PORT_VLAN1_PORT_TLS_MODE		BIT(13)
#define   AR934X_PORT_VLAN1_PORT_VLAN_PROP_EN		BIT(14)
#define   AR934X_PORT_VLAN1_PORT_CLONE_EN		BIT(15)
#define   AR934X_PORT_VLAN1_DEFAULT_CVID_S		16
#define   AR934X_PORT_VLAN1_FORCE_PORT_VLAN_EN		BIT(28)
#define   AR934X_PORT_VLAN1_ING_PORT_PRI_S		29

#define AR934X_REG_PORT_VLAN2(_port)	(AR934X_REG_PORT_BASE((_port)) + 0x0c)
#define   AR934X_PORT_VLAN2_PORT_VID_MEM_S		16
#define   AR934X_PORT_VLAN2_8021Q_MODE_S		30
#define   AR934X_PORT_VLAN2_8021Q_MODE_PORT_ONLY	0
#define   AR934X_PORT_VLAN2_8021Q_MODE_PORT_FALLBACK	1
#define   AR934X_PORT_VLAN2_8021Q_MODE_VLAN_ONLY	2
#define   AR934X_PORT_VLAN2_8021Q_MODE_SECURE		3

#define sw_to_ar7240(_dev) container_of(_dev, struct ar7240sw, swdev)

struct ar7240sw_port_stat {
	unsigned long rx_broadcast;
	unsigned long rx_pause;
	unsigned long rx_multicast;
	unsigned long rx_fcs_error;
	unsigned long rx_align_error;
	unsigned long rx_runt;
	unsigned long rx_fragments;
	unsigned long rx_64byte;
	unsigned long rx_128byte;
	unsigned long rx_256byte;
	unsigned long rx_512byte;
	unsigned long rx_1024byte;
	unsigned long rx_1518byte;
	unsigned long rx_maxbyte;
	unsigned long rx_toolong;
	unsigned long rx_good_byte;
	unsigned long rx_bad_byte;
	unsigned long rx_overflow;
	unsigned long filtered;

	unsigned long tx_broadcast;
	unsigned long tx_pause;
	unsigned long tx_multicast;
	unsigned long tx_underrun;
	unsigned long tx_64byte;
	unsigned long tx_128byte;
	unsigned long tx_256byte;
	unsigned long tx_512byte;
	unsigned long tx_1024byte;
	unsigned long tx_1518byte;
	unsigned long tx_maxbyte;
	unsigned long tx_oversize;
	unsigned long tx_byte;
	unsigned long tx_collision;
	unsigned long tx_abortcol;
	unsigned long tx_multicol;
	unsigned long tx_singlecol;
	unsigned long tx_excdefer;
	unsigned long tx_defer;
	unsigned long tx_xlatecol;
};

struct ar7240sw {
	struct mii_bus	*mii_bus;
	struct ag71xx_switch_platform_data *swdata;
	struct switch_dev swdev;
	int num_ports;
	u8 ver;
	bool vlan;
	u16 vlan_id[AR7240_MAX_VLANS];
	u8 vlan_table[AR7240_MAX_VLANS];
	u8 vlan_tagged;
	u16 pvid[AR7240_NUM_PORTS];
	char buf[80];

	rwlock_t stats_lock;
	struct ar7240sw_port_stat port_stats[AR7240_NUM_PORTS];
};

struct ar7240sw_hw_stat {
	char string[ETH_GSTRING_LEN];
	int sizeof_stat;
	int reg;
};

static DEFINE_MUTEX(reg_mutex);

static inline int sw_is_ar7240(struct ar7240sw *as)
{
	return as->ver == AR7240_MASK_CTRL_VERSION_AR7240;
}

static inline int sw_is_ar934x(struct ar7240sw *as)
{
	return as->ver == AR7240_MASK_CTRL_VERSION_AR934X;
}

static inline u32 ar7240sw_port_mask(struct ar7240sw *as, int port)
{
	return BIT(port);
}

static inline u32 ar7240sw_port_mask_all(struct ar7240sw *as)
{
	return BIT(as->swdev.ports) - 1;
}

static inline u32 ar7240sw_port_mask_but(struct ar7240sw *as, int port)
{
	return ar7240sw_port_mask_all(as) & ~BIT(port);
}

static inline u16 mk_phy_addr(u32 reg)
{
	return 0x17 & ((reg >> 4) | 0x10);
}

static inline u16 mk_phy_reg(u32 reg)
{
	return (reg << 1) & 0x1e;
}

static inline u16 mk_high_addr(u32 reg)
{
	return (reg >> 7) & 0x1ff;
}

static u32 __ar7240sw_reg_read(struct mii_bus *mii, u32 reg)
{
	unsigned long flags;
	u16 phy_addr;
	u16 phy_reg;
	u32 hi, lo;

	reg = (reg & 0xfffffffc) >> 2;
	phy_addr = mk_phy_addr(reg);
	phy_reg = mk_phy_reg(reg);

	local_irq_save(flags);
	ag71xx_mdio_mii_write(mii->priv, 0x1f, 0x10, mk_high_addr(reg));
	lo = (u32) ag71xx_mdio_mii_read(mii->priv, phy_addr, phy_reg);
	hi = (u32) ag71xx_mdio_mii_read(mii->priv, phy_addr, phy_reg + 1);
	local_irq_restore(flags);

	return (hi << 16) | lo;
}

static void __ar7240sw_reg_write(struct mii_bus *mii, u32 reg, u32 val)
{
	unsigned long flags;
	u16 phy_addr;
	u16 phy_reg;

	reg = (reg & 0xfffffffc) >> 2;
	phy_addr = mk_phy_addr(reg);
	phy_reg = mk_phy_reg(reg);

	local_irq_save(flags);
	ag71xx_mdio_mii_write(mii->priv, 0x1f, 0x10, mk_high_addr(reg));
	ag71xx_mdio_mii_write(mii->priv, phy_addr, phy_reg + 1, (val >> 16));
	ag71xx_mdio_mii_write(mii->priv, phy_addr, phy_reg, (val & 0xffff));
	local_irq_restore(flags);
}

static u32 ar7240sw_reg_read(struct mii_bus *mii, u32 reg_addr)
{
	u32 ret;

	mutex_lock(&reg_mutex);
	ret = __ar7240sw_reg_read(mii, reg_addr);
	mutex_unlock(&reg_mutex);

	return ret;
}

static void ar7240sw_reg_write(struct mii_bus *mii, u32 reg_addr, u32 reg_val)
{
	mutex_lock(&reg_mutex);
	__ar7240sw_reg_write(mii, reg_addr, reg_val);
	mutex_unlock(&reg_mutex);
}

static u32 ar7240sw_reg_rmw(struct mii_bus *mii, u32 reg, u32 mask, u32 val)
{
	u32 t;

	mutex_lock(&reg_mutex);
	t = __ar7240sw_reg_read(mii, reg);
	t &= ~mask;
	t |= val;
	__ar7240sw_reg_write(mii, reg, t);
	mutex_unlock(&reg_mutex);

	return t;
}

static void ar7240sw_reg_set(struct mii_bus *mii, u32 reg, u32 val)
{
	u32 t;

	mutex_lock(&reg_mutex);
	t = __ar7240sw_reg_read(mii, reg);
	t |= val;
	__ar7240sw_reg_write(mii, reg, t);
	mutex_unlock(&reg_mutex);
}

static int __ar7240sw_reg_wait(struct mii_bus *mii, u32 reg, u32 mask, u32 val,
			       unsigned timeout)
{
	int i;

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

		t = __ar7240sw_reg_read(mii, reg);
		if ((t & mask) == val)
			return 0;

		msleep(1);
	}

	return -ETIMEDOUT;
}

static int ar7240sw_reg_wait(struct mii_bus *mii, u32 reg, u32 mask, u32 val,
			     unsigned timeout)
{
	int ret;

	mutex_lock(&reg_mutex);
	ret = __ar7240sw_reg_wait(mii, reg, mask, val, timeout);
	mutex_unlock(&reg_mutex);
	return ret;
}

u16 ar7240sw_phy_read(struct mii_bus *mii, unsigned phy_addr,
		      unsigned reg_addr)
{
	u32 t, val = 0xffff;
	int err;

	if (phy_addr >= AR7240_NUM_PHYS)
		return 0xffff;

	mutex_lock(&reg_mutex);
	t = (reg_addr << AR7240_MDIO_CTRL_REG_ADDR_S) |
	    (phy_addr << AR7240_MDIO_CTRL_PHY_ADDR_S) |
	    AR7240_MDIO_CTRL_MASTER_EN |
	    AR7240_MDIO_CTRL_BUSY |
	    AR7240_MDIO_CTRL_CMD_READ;

	__ar7240sw_reg_write(mii, AR7240_REG_MDIO_CTRL, t);
	err = __ar7240sw_reg_wait(mii, AR7240_REG_MDIO_CTRL,
				  AR7240_MDIO_CTRL_BUSY, 0, 5);
	if (!err)
		val = __ar7240sw_reg_read(mii, AR7240_REG_MDIO_CTRL);
	mutex_unlock(&reg_mutex);

	return val & AR7240_MDIO_CTRL_DATA_M;
}

int ar7240sw_phy_write(struct mii_bus *mii, unsigned phy_addr,
		       unsigned reg_addr, u16 reg_val)
{
	u32 t;
	int ret;

	if (phy_addr >= AR7240_NUM_PHYS)
		return -EINVAL;

	mutex_lock(&reg_mutex);
	t = (phy_addr << AR7240_MDIO_CTRL_PHY_ADDR_S) |
	    (reg_addr << AR7240_MDIO_CTRL_REG_ADDR_S) |
	    AR7240_MDIO_CTRL_MASTER_EN |
	    AR7240_MDIO_CTRL_BUSY |
	    AR7240_MDIO_CTRL_CMD_WRITE |
	    reg_val;

	__ar7240sw_reg_write(mii, AR7240_REG_MDIO_CTRL, t);
	ret = __ar7240sw_reg_wait(mii, AR7240_REG_MDIO_CTRL,
				  AR7240_MDIO_CTRL_BUSY, 0, 5);
	mutex_unlock(&reg_mutex);

	return ret;
}

static int ar7240sw_capture_stats(struct ar7240sw *as)
{
	struct mii_bus *mii = as->mii_bus;
	int port;
	int ret;

	write_lock(&as->stats_lock);

	/* Capture the hardware statistics for all ports */
	ar7240sw_reg_write(mii, AR7240_REG_MIB_FUNCTION0,
			   (AR7240_MIB_FUNC_CAPTURE << AR7240_MIB_FUNC_S));

	/* Wait for the capturing to complete. */
	ret = ar7240sw_reg_wait(mii, AR7240_REG_MIB_FUNCTION0,
				AR7240_MIB_BUSY, 0, 10);

	if (ret)
		goto unlock;

	for (port = 0; port < AR7240_NUM_PORTS; port++) {
		unsigned int base;
		struct ar7240sw_port_stat *stats;

		base = AR7240_REG_STATS_BASE(port);
		stats = &as->port_stats[port];

#define READ_STAT(_r) ar7240sw_reg_read(mii, base + AR7240_STATS_ ## _r)

		stats->rx_good_byte += READ_STAT(RXGOODBYTE);
		stats->tx_byte += READ_STAT(TXBYTE);

#undef READ_STAT
	}

	ret = 0;

unlock:
	write_unlock(&as->stats_lock);
	return ret;
}

static void ar7240sw_disable_port(struct ar7240sw *as, unsigned port)
{
	ar7240sw_reg_write(as->mii_bus, AR7240_REG_PORT_CTRL(port),
			   AR7240_PORT_CTRL_STATE_DISABLED);
}

static void ar7240sw_setup(struct ar7240sw *as)
{
	struct mii_bus *mii = as->mii_bus;

	/* Enable CPU port, and disable mirror port */
	ar7240sw_reg_write(mii, AR7240_REG_CPU_PORT,
			   AR7240_CPU_PORT_EN |
			   (15 << AR7240_MIRROR_PORT_S));

	/* Setup TAG priority mapping */
	ar7240sw_reg_write(mii, AR7240_REG_TAG_PRIORITY, 0xfa50);

	/* Enable ARP frame acknowledge, aging, MAC replacing */
	ar7240sw_reg_write(mii, AR7240_REG_AT_CTRL,
		AR7240_AT_CTRL_RESERVED |
		0x2b /* 5 min age time */ |
		AR7240_AT_CTRL_AGE_EN |
		AR7240_AT_CTRL_ARP_EN |
		AR7240_AT_CTRL_LEARN_CHANGE);

	/* Enable Broadcast frames transmitted to the CPU */
	ar7240sw_reg_set(mii, AR7240_REG_FLOOD_MASK,
			 AR7240_FLOOD_MASK_BROAD_TO_CPU);

	/* setup MTU */
	ar7240sw_reg_rmw(mii, AR7240_REG_GLOBAL_CTRL, AR7240_GLOBAL_CTRL_MTU_M,
			 1536);

	/* setup Service TAG */
	ar7240sw_reg_rmw(mii, AR7240_REG_SERVICE_TAG, AR7240_SERVICE_TAG_M, 0);
}

static int ar7240sw_reset(struct ar7240sw *as)
{
	struct mii_bus *mii = as->mii_bus;
	int ret;
	int i;

	/* Set all ports to disabled state. */
	for (i = 0; i < AR7240_NUM_PORTS; i++)
		ar7240sw_disable_port(as, i);

	/* Wait for transmit queues to drain. */
	msleep(2);

	/* Reset the switch. */
	ar7240sw_reg_write(mii, AR7240_REG_MASK_CTRL,
			   AR7240_MASK_CTRL_SOFT_RESET);

	ret = ar7240sw_reg_wait(mii, AR7240_REG_MASK_CTRL,
				AR7240_MASK_CTRL_SOFT_RESET, 0, 1000);

	ar7240sw_setup(as);
	return ret;
}

static void ar7240sw_setup_port(struct ar7240sw *as, unsigned port, u8 portmask)
{
	struct mii_bus *mii = as->mii_bus;
	u32 ctrl;
	u32 vid, mode;

	ctrl = AR7240_PORT_CTRL_STATE_FORWARD | AR7240_PORT_CTRL_LEARN |
		AR7240_PORT_CTRL_SINGLE_VLAN;

	if (port == AR7240_PORT_CPU) {
		ar7240sw_reg_write(mii, AR7240_REG_PORT_STATUS(port),
				   AR7240_PORT_STATUS_SPEED_1000 |
				   AR7240_PORT_STATUS_TXFLOW |
				   AR7240_PORT_STATUS_RXFLOW |
				   AR7240_PORT_STATUS_TXMAC |
				   AR7240_PORT_STATUS_RXMAC |
				   AR7240_PORT_STATUS_DUPLEX);
	} else {
		ar7240sw_reg_write(mii, AR7240_REG_PORT_STATUS(port),
				   AR7240_PORT_STATUS_LINK_AUTO);
	}

	/* Set the default VID for this port */
	if (as->vlan) {
		vid = as->vlan_id[as->pvid[port]];
		mode = AR7240_PORT_VLAN_MODE_SECURE;
	} else {
		vid = port;
		mode = AR7240_PORT_VLAN_MODE_PORT_ONLY;
	}

	if (as->vlan && (as->vlan_tagged & BIT(port))) {
		ctrl |= AR7240_PORT_CTRL_VLAN_MODE_ADD <<
			AR7240_PORT_CTRL_VLAN_MODE_S;
	} else {
		ctrl |= AR7240_PORT_CTRL_VLAN_MODE_STRIP <<
			AR7240_PORT_CTRL_VLAN_MODE_S;
	}

	if (!portmask) {
		if (port == AR7240_PORT_CPU)
			portmask = ar7240sw_port_mask_but(as, AR7240_PORT_CPU);
		else
			portmask = ar7240sw_port_mask(as, AR7240_PORT_CPU);
	}

	/* allow the port to talk to all other ports, but exclude its
	 * own ID to prevent frames from being reflected back to the
	 * port that they came from */
	portmask &= ar7240sw_port_mask_but(as, port);

	ar7240sw_reg_write(mii, AR7240_REG_PORT_CTRL(port), ctrl);
	if (sw_is_ar934x(as)) {
		u32 vlan1, vlan2;

		vlan1 = (vid << AR934X_PORT_VLAN1_DEFAULT_CVID_S);
		vlan2 = (portmask << AR934X_PORT_VLAN2_PORT_VID_MEM_S) |
			(mode << AR934X_PORT_VLAN2_8021Q_MODE_S);
		ar7240sw_reg_write(mii, AR934X_REG_PORT_VLAN1(port), vlan1);
		ar7240sw_reg_write(mii, AR934X_REG_PORT_VLAN2(port), vlan2);
	} else {
		u32 vlan;

		vlan = vid | (mode << AR7240_PORT_VLAN_MODE_S) |
		       (portmask << AR7240_PORT_VLAN_DEST_PORTS_S);

		ar7240sw_reg_write(mii, AR7240_REG_PORT_VLAN(port), vlan);
	}
}

static int ar7240_set_addr(struct ar7240sw *as, u8 *addr)
{
	struct mii_bus *mii = as->mii_bus;
	u32 t;

	t = (addr[4] << 8) | addr[5];
	ar7240sw_reg_write(mii, AR7240_REG_MAC_ADDR0, t);

	t = (addr[0] << 24) | (addr[1] << 16) | (addr[2] << 8) | addr[3];
	ar7240sw_reg_write(mii, AR7240_REG_MAC_ADDR1, t);

	return 0;
}

static int
ar7240_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
		struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	as->vlan_id[val->port_vlan] = val->value.i;
	return 0;
}

static int
ar7240_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
		struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	val->value.i = as->vlan_id[val->port_vlan];
	return 0;
}

static int
ar7240_set_pvid(struct switch_dev *dev, int port, int vlan)
{
	struct ar7240sw *as = sw_to_ar7240(dev);

	/* make sure no invalid PVIDs get set */

	if (vlan >= dev->vlans)
		return -EINVAL;

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

static int
ar7240_get_pvid(struct switch_dev *dev, int port, int *vlan)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	*vlan = as->pvid[port];
	return 0;
}

static int
ar7240_get_ports(struct switch_dev *dev, struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	u8 ports = as->vlan_table[val->port_vlan];
	int i;

	val->len = 0;
	for (i = 0; i < as->swdev.ports; i++) {
		struct switch_port *p;

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

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

static int
ar7240_set_ports(struct switch_dev *dev, struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	u8 *vt = &as->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))
			as->vlan_tagged |= (1 << p->id);
		else {
			as->vlan_tagged &= ~(1 << p->id);
			as->pvid[p->id] = val->port_vlan;

			/* make sure that an untagged port does not
			 * appear in other vlans */
			for (j = 0; j < AR7240_MAX_VLANS; j++) {
				if (j == val->port_vlan)
					continue;
				as->vlan_table[j] &= ~(1 << p->id);
			}
		}

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

static int
ar7240_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
		struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	as->vlan = !!val->value.i;
	return 0;
}

static int
ar7240_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
		struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	val->value.i = as->vlan;
	return 0;
}

static const char *
ar7240_speed_str(u32 status)
{
	u32 speed;

	speed = (status >> AR7240_PORT_STATUS_SPEED_S) &
					AR7240_PORT_STATUS_SPEED_M;
	switch (speed) {
	case AR7240_PORT_STATUS_SPEED_10:
		return "10baseT";
	case AR7240_PORT_STATUS_SPEED_100:
		return "100baseT";
	case AR7240_PORT_STATUS_SPEED_1000:
		return "1000baseT";
	}

	return "unknown";
}

static int
ar7240_port_get_link(struct switch_dev *dev, const struct switch_attr *attr,
		     struct switch_val *val)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	struct mii_bus *mii = as->mii_bus;
	u32 len;
	u32 status;
	int port;

	port = val->port_vlan;

	memset(as->buf, '\0', sizeof(as->buf));
	status = ar7240sw_reg_read(mii, AR7240_REG_PORT_STATUS(port));

	if (status & AR7240_PORT_STATUS_LINK_UP) {
		len = snprintf(as->buf, sizeof(as->buf),
				"port:%d link:up speed:%s %s-duplex %s%s%s",
				port,
				ar7240_speed_str(status),
				(status & AR7240_PORT_STATUS_DUPLEX) ?
					"full" : "half",
				(status & AR7240_PORT_STATUS_TXFLOW) ?
					"txflow ": "",
				(status & AR7240_PORT_STATUS_RXFLOW) ?
					"rxflow " : "",
				(status & AR7240_PORT_STATUS_LINK_AUTO) ?
					"auto ": "");
	} else {
		len = snprintf(as->buf, sizeof(as->buf),
			       "port:%d link:down", port);
	}

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

	return 0;
}

static void
ar7240_vtu_op(struct ar7240sw *as, u32 op, u32 val)
{
	struct mii_bus *mii = as->mii_bus;

	if (ar7240sw_reg_wait(mii, AR7240_REG_VTU, AR7240_VTU_ACTIVE, 0, 5))
		return;

	if ((op & AR7240_VTU_OP) == AR7240_VTU_OP_LOAD) {
		val &= AR7240_VTUDATA_MEMBER;
		val |= AR7240_VTUDATA_VALID;
		ar7240sw_reg_write(mii, AR7240_REG_VTU_DATA, val);
	}
	op |= AR7240_VTU_ACTIVE;
	ar7240sw_reg_write(mii, AR7240_REG_VTU, op);
}

static int
ar7240_hw_apply(struct switch_dev *dev)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	u8 portmask[AR7240_NUM_PORTS];
	int i, j;

	/* flush all vlan translation unit entries */
	ar7240_vtu_op(as, AR7240_VTU_OP_FLUSH, 0);

	memset(portmask, 0, sizeof(portmask));
	if (as->vlan) {
		/* calculate the port destination masks and load vlans
		 * into the vlan translation unit */
		for (j = 0; j < AR7240_MAX_VLANS; j++) {
			u8 vp = as->vlan_table[j];

			if (!vp)
				continue;

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

			ar7240_vtu_op(as,
				AR7240_VTU_OP_LOAD |
				(as->vlan_id[j] << AR7240_VTU_VID_S),
				as->vlan_table[j]);
		}
	} else {
		/* vlan disabled:
		 * isolate all ports, but connect them to the cpu port */
		for (i = 0; i < as->swdev.ports; i++) {
			if (i == AR7240_PORT_CPU)
				continue;

			portmask[i] = 1 << AR7240_PORT_CPU;
			portmask[AR7240_PORT_CPU] |= (1 << i);
		}
	}

	/* update the port destination mask registers and tag settings */
	for (i = 0; i < as->swdev.ports; i++)
		ar7240sw_setup_port(as, i, portmask[i]);

	return 0;
}

static int
ar7240_reset_switch(struct switch_dev *dev)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	ar7240sw_reset(as);
	return 0;
}

static int
ar7240_get_port_link(struct switch_dev *dev, int port,
		     struct switch_port_link *link)
{
	struct ar7240sw *as = sw_to_ar7240(dev);
	struct mii_bus *mii = as->mii_bus;
	u32 status;

	if (port > AR7240_NUM_PORTS)
		return -EINVAL;

	status = ar7240sw_reg_read(mii, AR7240_REG_PORT_STATUS(port));

	link->link = !!(status & AR7240_PORT_STATUS_LINK_UP);
	link->aneg = !!(status & AR7240_PORT_STATUS_LINK_AUTO);
	link->duplex = !!(status & AR7240_PORT_STATUS_DUPLEX);
	link->tx_flow = !!(status & AR7240_PORT_STATUS_TXFLOW);
	link->rx_flow = !!(status & AR7240_PORT_STATUS_RXFLOW);
	switch (status & AR7240_PORT_STATUS_SPEED_M) {
	case AR7240_PORT_STATUS_SPEED_10:
		link->speed = SWITCH_PORT_SPEED_10;
		break;
	case AR7240_PORT_STATUS_SPEED_100:
		link->speed = SWITCH_PORT_SPEED_100;
		break;
	case AR7240_PORT_STATUS_SPEED_1000:
		link->speed = SWITCH_PORT_SPEED_1000;
		break;
	}

	return 0;
}

static int
ar7240_get_port_stats(struct switch_dev *dev, int port,
		      struct switch_port_stats *stats)
{
	struct ar7240sw *as = sw_to_ar7240(dev);

	if (port > AR7240_NUM_PORTS)
		return -EINVAL;

	ar7240sw_capture_stats(as);

	read_lock(&as->stats_lock);
	stats->rx_bytes = as->port_stats[port].rx_good_byte;
	stats->tx_bytes = as->port_stats[port].tx_byte;
	read_unlock(&as->stats_lock);

	return 0;
}

static struct switch_attr ar7240_globals[] = {
	{
		.type = SWITCH_TYPE_INT,
		.name = "enable_vlan",
		.description = "Enable VLAN mode",
		.set = ar7240_set_vlan,
		.get = ar7240_get_vlan,
		.max = 1
	},
};

static struct switch_attr ar7240_port[] = {
	{
		.type = SWITCH_TYPE_STRING,
		.name = "link",
		.description = "Get port link information",
		.max = 1,
		.set = NULL,
		.get = ar7240_port_get_link,
	},
};

static struct switch_attr ar7240_vlan[] = {
	{
		.type = SWITCH_TYPE_INT,
		.name = "vid",
		.description = "VLAN ID",
		.set = ar7240_set_vid,
		.get = ar7240_get_vid,
		.max = 4094,
	},
};

static const struct switch_dev_ops ar7240_ops = {
	.attr_global = {
		.attr = ar7240_globals,
		.n_attr = ARRAY_SIZE(ar7240_globals),
	},
	.attr_port = {
		.attr = ar7240_port,
		.n_attr = ARRAY_SIZE(ar7240_port),
	},
	.attr_vlan = {
		.attr = ar7240_vlan,
		.n_attr = ARRAY_SIZE(ar7240_vlan),
	},
	.get_port_pvid = ar7240_get_pvid,
	.set_port_pvid = ar7240_set_pvid,
	.get_vlan_ports = ar7240_get_ports,
	.set_vlan_ports = ar7240_set_ports,
	.apply_config = ar7240_hw_apply,
	.reset_switch = ar7240_reset_switch,
	.get_port_link = ar7240_get_port_link,
	.get_port_stats = ar7240_get_port_stats,
};

static struct ar7240sw *ar7240_probe(struct ag71xx *ag)
{
	struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
	struct mii_bus *mii = ag->mii_bus;
	struct ar7240sw *as;
	struct switch_dev *swdev;
	u32 ctrl;
	u16 phy_id1;
	u16 phy_id2;
	int i;

	phy_id1 = ar7240sw_phy_read(mii, 0, MII_PHYSID1);
	phy_id2 = ar7240sw_phy_read(mii, 0, MII_PHYSID2);
	if ((phy_id1 != AR7240_PHY_ID1 || phy_id2 != AR7240_PHY_ID2) &&
	    (phy_id1 != AR934X_PHY_ID1 || phy_id2 != AR934X_PHY_ID2)) {
		pr_err("%s: unknown phy id '%04x:%04x'\n",
		       ag->dev->name, phy_id1, phy_id2);
		return NULL;
	}

	as = kzalloc(sizeof(*as), GFP_KERNEL);
	if (!as)
		return NULL;

	as->mii_bus = mii;
	as->swdata = pdata->switch_data;

	swdev = &as->swdev;

	ctrl = ar7240sw_reg_read(mii, AR7240_REG_MASK_CTRL);
	as->ver = (ctrl >> AR7240_MASK_CTRL_VERSION_S) &
		  AR7240_MASK_CTRL_VERSION_M;

	if (sw_is_ar7240(as)) {
		swdev->name = "AR7240/AR9330 built-in switch";
	} else if (sw_is_ar934x(as)) {
		swdev->name = "AR934X built-in switch";

		if (pdata->phy_if_mode == PHY_INTERFACE_MODE_GMII) {
			ar7240sw_reg_set(mii, AR934X_REG_OPER_MODE0,
					 AR934X_OPER_MODE0_MAC_GMII_EN);
		} else if (pdata->phy_if_mode == PHY_INTERFACE_MODE_MII) {
			ar7240sw_reg_set(mii, AR934X_REG_OPER_MODE0,
					 AR934X_OPER_MODE0_PHY_MII_EN);
		} else {
			pr_err("%s: invalid PHY interface mode\n",
			       ag->dev->name);
			goto err_free;
		}

		if (as->swdata->phy4_mii_en)
			ar7240sw_reg_set(mii, AR934X_REG_OPER_MODE1,
					 AR934X_REG_OPER_MODE1_PHY4_MII_EN);
	} else {
		pr_err("%s: unsupported chip, ctrl=%08x\n",
			ag->dev->name, ctrl);
		goto err_free;
	}

	swdev->ports = AR7240_NUM_PORTS - 1;
	swdev->cpu_port = AR7240_PORT_CPU;
	swdev->vlans = AR7240_MAX_VLANS;
	swdev->ops = &ar7240_ops;

	if (register_switch(&as->swdev, ag->dev) < 0)
		goto err_free;

	pr_info("%s: Found an %s\n", ag->dev->name, swdev->name);

	/* initialize defaults */
	for (i = 0; i < AR7240_MAX_VLANS; i++)
		as->vlan_id[i] = i;

	as->vlan_table[0] = ar7240sw_port_mask_all(as);

	return as;

err_free:
	kfree(as);
	return NULL;
}

static void link_function(struct work_struct *work) {
	struct ag71xx *ag = container_of(work, struct ag71xx, link_work.work);
	unsigned long flags;
	int i;
	int status = 0;

	for (i = 0; i < 4; i++) {
		int link = ar7240sw_phy_read(ag->mii_bus, i, MII_BMSR);
		if(link & BMSR_LSTATUS) {
			status = 1;
			break;
		}
	}

	spin_lock_irqsave(&ag->lock, flags);
	if(status != ag->link) {
		ag->link = status;
		ag71xx_link_adjust(ag);
	}
	spin_unlock_irqrestore(&ag->lock, flags);

	schedule_delayed_work(&ag->link_work, HZ / 2);
}

void ag71xx_ar7240_start(struct ag71xx *ag)
{
	struct ar7240sw *as = ag->phy_priv;

	ar7240sw_reset(as);

	ag->speed = SPEED_1000;
	ag->duplex = 1;

	ar7240_set_addr(as, ag->dev->dev_addr);
	ar7240_hw_apply(&as->swdev);

	schedule_delayed_work(&ag->link_work, HZ / 10);
}

void ag71xx_ar7240_stop(struct ag71xx *ag)
{
	cancel_delayed_work_sync(&ag->link_work);
}

int __devinit ag71xx_ar7240_init(struct ag71xx *ag)
{
	struct ar7240sw *as;

	as = ar7240_probe(ag);
	if (!as)
		return -ENODEV;

	ag->phy_priv = as;
	ar7240sw_reset(as);

	rwlock_init(&as->stats_lock);
	INIT_DELAYED_WORK(&ag->link_work, link_function);

	return 0;
}

void ag71xx_ar7240_cleanup(struct ag71xx *ag)
{
	struct ar7240sw *as = ag->phy_priv;

	if (!as)
		return;

	unregister_switch(&as->swdev);
	kfree(as);
	ag->phy_priv = NULL;
}