ar71xx: add DSA driver for the AR7240 built-in ethernet switch

SVN-Revision: 19927

1 files changed, 736 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/net/dsa/ar7240.c b/target/linux/ar71xx/files/net/dsa/ar7240.c
new file mode 100644
index 0000000000..b681a34514
--- /dev/null
+++ b/target/linux/ar71xx/files/net/dsa/ar7240.c
@@ -0,0 +1,736 @@
+/*
+ *  DSA driver for the built-in ethernet switch of the Atheros AR7240 SoC
+ *  Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  This file was based on:
+ *    net/dsa/mv88e6060.c - Driver for Marvell 88e6060 switch chips
+ *    Copyright (c) 2008 Marvell Semiconductor
+ *
+ *  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 "dsa_priv.h"
+
+#define BITM(_count)	(BIT(_count) - 1)
+
+#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_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_AT_CTRL		0x5c
+#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_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_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 AR7240_PORT_MASK(_port)		BIT((_port))
+#define AR7240_PORT_MASK_ALL		BITM(AR7240_NUM_PORTS)
+#define AR7240_PORT_MASK_BUT(_port)	(AR7240_PORT_MASK_ALL & ~BIT((_port)))
+
+struct ar7240sw {
+	struct mii_bus	*mii_bus;
+	struct mutex	reg_mutex;
+	struct mutex	stats_mutex;
+};
+
+struct ar7240sw_hw_stat {
+	char string[ETH_GSTRING_LEN];
+	int sizeof_stat;
+	int reg;
+};
+
+static inline struct ar7240sw *dsa_to_ar7240sw(struct dsa_switch *ds)
+{
+	return (struct ar7240sw *)(ds + 1);
+}
+
+static inline void ar7240sw_init(struct ar7240sw *as, struct mii_bus *mii)
+{
+	as->mii_bus = mii;
+	mutex_init(&as->reg_mutex);
+	mutex_init(&as->stats_mutex);
+}
+
+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 ar7240sw *as, u32 reg)
+{
+	struct mii_bus *mii = as->mii_bus;
+	u16 phy_addr;
+	u16 phy_reg;
+	u32 hi, lo;
+
+	reg = (reg & 0xfffffffc) >> 2;
+
+	mdiobus_write(mii, 0x1f, 0x10, mk_high_addr(reg));
+
+	phy_addr = mk_phy_addr(reg);
+	phy_reg = mk_phy_reg(reg);
+
+	lo = (u32) mdiobus_read(mii, phy_addr, phy_reg);
+	hi = (u32) mdiobus_read(mii, phy_addr, phy_reg + 1);
+
+	return ((hi << 16) | lo);
+}
+
+static void __ar7240sw_reg_write(struct ar7240sw *as, u32 reg, u32 val)
+{
+	struct mii_bus *mii = as->mii_bus;
+	u16 phy_addr;
+	u16 phy_reg;
+
+	reg = (reg & 0xfffffffc) >> 2;
+
+	mdiobus_write(mii, 0x1f, 0x10, mk_high_addr(reg));
+
+	phy_addr = mk_phy_addr(reg);
+	phy_reg = mk_phy_reg(reg);
+
+	mdiobus_write(mii, phy_addr, phy_reg + 1, (val >> 16));
+	mdiobus_write(mii, phy_addr, phy_reg, (val & 0xffff));
+}
+
+static u32 ar7240sw_reg_read(struct ar7240sw *as, u32 reg_addr)
+{
+	u32 ret;
+
+	mutex_lock(&as->reg_mutex);
+	ret = __ar7240sw_reg_read(as, reg_addr);
+	mutex_unlock(&as->reg_mutex);
+
+	return ret;
+}
+
+static void ar7240sw_reg_write(struct ar7240sw *as, u32 reg_addr, u32 reg_val)
+{
+	mutex_lock(&as->reg_mutex);
+	__ar7240sw_reg_write(as, reg_addr, reg_val);
+	mutex_unlock(&as->reg_mutex);
+}
+
+static u32 ar7240sw_reg_rmw(struct ar7240sw *as, u32 reg, u32 mask, u32 val)
+{
+	u32 t;
+
+	mutex_lock(&as->reg_mutex);
+	t = __ar7240sw_reg_read(as, reg);
+	t &= ~mask;
+	t |= val;
+	__ar7240sw_reg_write(as, reg, t);
+	mutex_unlock(&as->reg_mutex);
+
+	return t;
+}
+
+static void ar7240sw_reg_set(struct ar7240sw *as, u32 reg, u32 val)
+{
+	u32 t;
+
+	mutex_lock(&as->reg_mutex);
+	t = __ar7240sw_reg_read(as, reg);
+	t |= val;
+	__ar7240sw_reg_write(as, reg, t);
+	mutex_unlock(&as->reg_mutex);
+}
+
+static int ar7240sw_reg_wait(struct ar7240sw *as, u32 reg, u32 mask, u32 val,
+			     unsigned timeout)
+{
+	int i;
+
+	for (i = 0; i < timeout; i++) {
+		u32 t;
+
+		t = ar7240sw_reg_read(as, reg);
+		if ((t & mask) == val)
+			return 0;
+
+		msleep(1);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static u16 ar7240sw_phy_read(struct ar7240sw *as, unsigned phy_addr,
+			     unsigned reg_addr)
+{
+	u32 t;
+	int err;
+
+	if (phy_addr >= AR7240_NUM_PHYS)
+		return 0xffff;
+
+	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(as, AR7240_REG_MDIO_CTRL, t);
+	err = ar7240sw_reg_wait(as, AR7240_REG_MDIO_CTRL,
+				AR7240_MDIO_CTRL_BUSY, 0, 5);
+	if (err)
+		return 0xffff;
+
+	t = ar7240sw_reg_read(as, AR7240_REG_MDIO_CTRL);
+	return (t & AR7240_MDIO_CTRL_DATA_M);
+}
+
+static int ar7240sw_phy_write(struct ar7240sw *as, unsigned phy_addr,
+			      unsigned reg_addr, u16 reg_val)
+{
+	u32 t;
+	int ret;
+
+	if (phy_addr >= AR7240_NUM_PHYS)
+		return -EINVAL;
+
+	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(as, AR7240_REG_MDIO_CTRL, t);
+	ret = ar7240sw_reg_wait(as, AR7240_REG_MDIO_CTRL,
+				AR7240_MDIO_CTRL_BUSY, 0, 5);
+	return ret;
+}
+
+static int ar7240sw_capture_stats(struct ar7240sw *as)
+{
+	int ret;
+
+	/* Capture the hardware statistics for all ports */
+	ar7240sw_reg_write(as, AR7240_REG_MIB_FUNCTION0,
+			   (AR7240_MIB_FUNC_CAPTURE << AR7240_MIB_FUNC_S));
+
+	/* Wait for the capturing to complete. */
+	ret = ar7240sw_reg_wait(as, AR7240_REG_MIB_FUNCTION0,
+				AR7240_MIB_BUSY, 0, 10);
+	return ret;
+}
+
+static void ar7240sw_disable_port(struct ar7240sw *as, unsigned port)
+{
+	ar7240sw_reg_write(as, AR7240_REG_PORT_CTRL(port),
+			   AR7240_PORT_CTRL_STATE_DISABLED);
+}
+
+static int ar7240sw_reset(struct ar7240sw *as)
+{
+	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(as, AR7240_REG_MASK_CTRL,
+			   AR7240_MASK_CTRL_SOFT_RESET);
+
+	ret = ar7240sw_reg_wait(as, AR7240_REG_MASK_CTRL,
+			        AR7240_MASK_CTRL_SOFT_RESET, 0, 1000);
+	return ret;
+}
+
+static void ar7240sw_setup(struct ar7240sw *as)
+{
+	/* Enable CPU port, and disable mirror port */
+	ar7240sw_reg_write(as, AR7240_REG_CPU_PORT,
+			   AR7240_CPU_PORT_EN |
+			   (15 << AR7240_MIRROR_PORT_S));
+
+	/* Setup TAG priority mapping */
+	ar7240sw_reg_write(as, AR7240_REG_TAG_PRIORITY, 0xfa50);
+
+	/* Enable ARP frame acknowledge */
+	ar7240sw_reg_set(as, AR7240_REG_AT_CTRL, AR7240_AT_CTRL_ARP_EN);
+
+	/* Enable Broadcast frames transmitted to the CPU */
+	ar7240sw_reg_set(as, AR7240_REG_FLOOD_MASK,
+			 AR7240_FLOOD_MASK_BROAD_TO_CPU);
+
+	/* setup MTU */
+	ar7240sw_reg_rmw(as, AR7240_REG_GLOBAL_CTRL, AR7240_GLOBAL_CTRL_MTU_M,
+			 1536);
+
+	/* setup Service TAG */
+	ar7240sw_reg_rmw(as, AR7240_REG_SERVICE_TAG, AR7240_SERVICE_TAG_M,
+			 ETH_P_QINQ);
+}
+
+static void ar7240sw_setup_port(struct ar7240sw *as, unsigned port)
+{
+	u32 ctrl;
+	u32 dest_ports;
+	u32 vlan;
+
+	ctrl = AR7240_PORT_CTRL_STATE_FORWARD;
+
+	if (port == AR7240_PORT_CPU) {
+		ar7240sw_reg_write(as, 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);
+
+		/* allow the CPU port to talk to each of the 'real' ports */
+		dest_ports = AR7240_PORT_MASK_BUT(port);
+
+		/* remove service tag from ingress frames */
+		ctrl |= AR7240_PORT_CTRL_DOUBLE_TAG;
+	} else {
+		ar7240sw_reg_write(as, AR7240_REG_PORT_STATUS(port),
+				   AR7240_PORT_STATUS_LINK_AUTO);
+
+		/*
+		 * allow each of the 'real' ports to only talk to the CPU
+		 * port.
+		 */
+		dest_ports = AR7240_PORT_MASK(port) |
+			     AR7240_PORT_MASK(AR7240_PORT_CPU);
+
+		/* add service tag to egress frames */
+		ctrl |= (AR7240_PORT_CTRL_VLAN_MODE_DOUBLE_TAG <<
+			 AR7240_PORT_CTRL_VLAN_MODE_S);
+	}
+
+	/* set default VID and and destination ports for this VLAN */
+	vlan = port;
+	vlan |= (dest_ports << AR7240_PORT_VLAN_DEST_PORTS_S);
+
+	ar7240sw_reg_write(as, AR7240_REG_PORT_CTRL(port), ctrl);
+	ar7240sw_reg_write(as, AR7240_REG_PORT_VLAN(port), vlan);
+}
+
+static char *ar7240_dsa_probe(struct mii_bus *mii, int sw_addr)
+{
+	struct ar7240sw as;
+	u32 ctrl;
+	u16 phy_id1;
+	u16 phy_id2;
+	u8 ver;
+
+	ar7240sw_init(&as, mii);
+
+	ctrl = ar7240sw_reg_read(&as, AR7240_REG_MASK_CTRL);
+
+	ver = (ctrl >> AR7240_MASK_CTRL_VERSION_S) & AR7240_MASK_CTRL_VERSION_M;
+	if (ver != 1) {
+		pr_err("ar7240_dsa: unsupported chip, ctrl=%08x\n", ctrl);
+		return NULL;
+	}
+
+	phy_id1 = ar7240sw_phy_read(&as, 0, MII_PHYSID1);
+	phy_id2 = ar7240sw_phy_read(&as, 0, MII_PHYSID2);
+	if (phy_id1 != AR7240_PHY_ID1 || phy_id2 != AR7240_PHY_ID2) {
+		pr_err("ar7240_dsa: unknown phy id '%04x:%04x'\n",
+		       phy_id1, phy_id2);
+		return NULL;
+	}
+
+	return "Atheros AR7240 built-in";
+}
+
+static int ar7240_dsa_setup(struct dsa_switch *ds)
+{
+	struct ar7240sw *as = dsa_to_ar7240sw(ds);
+	int i;
+	int ret;
+
+	ar7240sw_init(as, ds->master_mii_bus);
+
+	ret = ar7240sw_reset(as);
+	if (ret)
+		return ret;
+
+	ar7240sw_setup(as);
+
+	for (i = 0; i < AR7240_NUM_PORTS; i++) {
+		if (dsa_is_cpu_port(ds, i) || (ds->phys_port_mask & (1 << i)))
+			ar7240sw_setup_port(as, i);
+		else
+			ar7240sw_disable_port(as, i);
+	}
+
+	return 0;
+}
+
+static int ar7240_dsa_set_addr(struct dsa_switch *ds, u8 *addr)
+{
+	struct ar7240sw *as = dsa_to_ar7240sw(ds);
+	u32 t;
+
+	t = (addr[4] << 8) | addr[5];
+	ar7240sw_reg_write(as, AR7240_REG_MAC_ADDR0, t);
+
+	t = (addr[0] << 24) | (addr[1] << 16) | (addr[2] << 8) | addr[3];
+	ar7240sw_reg_write(as, AR7240_REG_MAC_ADDR0, t);
+
+	return 0;
+}
+
+static int ar7240_iort_to_phy_addr(int port)
+{
+	if (port > 0 && port < AR7240_NUM_PORTS)
+		return port - 1;
+
+	return -EINVAL;
+}
+
+static int ar7240_dsa_phy_read(struct dsa_switch *ds, int port, int regnum)
+{
+	struct ar7240sw *as = dsa_to_ar7240sw(ds);
+	int phy_addr;
+
+	phy_addr = ar7240_iort_to_phy_addr(port);
+	if (phy_addr < 0)
+		return 0xffff;
+
+	return ar7240sw_phy_read(as, phy_addr, regnum);
+}
+
+static int ar7240_dsa_phy_write(struct dsa_switch *ds, int port, int regnum,
+				u16 val)
+{
+	struct ar7240sw *as = dsa_to_ar7240sw(ds);
+	int phy_addr;
+
+	phy_addr = ar7240_iort_to_phy_addr(port);
+	if (phy_addr < 0)
+		return 0xffff;
+
+	return ar7240sw_phy_write(as, phy_addr, regnum, val);
+}
+
+static const char *ar7240sw_speed_str(unsigned speed)
+{
+	switch (speed) {
+	case AR7240_PORT_STATUS_SPEED_10:
+		return "10";
+	case AR7240_PORT_STATUS_SPEED_100:
+		return "100";
+	case AR7240_PORT_STATUS_SPEED_1000:
+		return "1000";
+	}
+
+	return "????";
+}
+
+static void ar7240_dsa_poll_link(struct dsa_switch *ds)
+{
+	struct ar7240sw *as = dsa_to_ar7240sw(ds);
+	int i;
+
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		struct net_device *dev;
+		u32 status;
+		int link;
+		unsigned speed;
+		int duplex;
+
+		dev = ds->ports[i];
+		if (dev == NULL)
+			continue;
+
+		link = 0;
+		if (dev->flags & IFF_UP) {
+			status = ar7240sw_reg_read(as,
+						   AR7240_REG_PORT_STATUS(i));
+			link = !!(status & AR7240_PORT_STATUS_LINK_UP);
+		}
+
+		if (!link) {
+			if (netif_carrier_ok(dev)) {
+				pr_info("%s: link down\n", dev->name);
+				netif_carrier_off(dev);
+			}
+			continue;
+		}
+
+		speed = (status & AR7240_PORT_STATUS_SPEED_M);
+		duplex = (status & AR7240_PORT_STATUS_DUPLEX) ? 1 : 0;
+		if (!netif_carrier_ok(dev)) {
+			pr_info("%s: link up, %sMb/s, %s duplex",
+				dev->name,
+				ar7240sw_speed_str(speed),
+				duplex ? "full" : "half");
+			netif_carrier_on(dev);
+		}
+	}
+}
+
+static const struct ar7240sw_hw_stat ar7240_hw_stats[] = {
+	{ "rx_broadcast"	, 4, AR7240_STATS_RXBROAD, },
+	{ "rx_pause"		, 4, AR7240_STATS_RXPAUSE, },
+	{ "rx_multicast"	, 4, AR7240_STATS_RXMULTI, },
+	{ "rx_fcs_error"	, 4, AR7240_STATS_RXFCSERR, },
+	{ "rx_align_error"	, 4, AR7240_STATS_RXALIGNERR, },
+	{ "rx_undersize"	, 4, AR7240_STATS_RXRUNT, },
+	{ "rx_fragments"	, 4, AR7240_STATS_RXFRAGMENT, },
+	{ "rx_64bytes"		, 4, AR7240_STATS_RX64BYTE, },
+	{ "rx_65_127bytes"	, 4, AR7240_STATS_RX128BYTE, },
+	{ "rx_128_255bytes"	, 4, AR7240_STATS_RX256BYTE, },
+	{ "rx_256_511bytes"	, 4, AR7240_STATS_RX512BYTE, },
+	{ "rx_512_1023bytes"	, 4, AR7240_STATS_RX1024BYTE, },
+	{ "rx_1024_1518bytes"	, 4, AR7240_STATS_RX1518BYTE, },
+	{ "rx_1519_max_bytes"	, 4, AR7240_STATS_RXMAXBYTE, },
+	{ "rx_oversize"		, 4, AR7240_STATS_RXTOOLONG, },
+	{ "rx_good_bytes"	, 8, AR7240_STATS_RXGOODBYTE, },
+	{ "rx_bad_bytes"	, 8, AR7240_STATS_RXBADBYTE, },
+	{ "rx_overflow"		, 4, AR7240_STATS_RXOVERFLOW, },
+	{ "filtered"		, 4, AR7240_STATS_FILTERED, },
+	{ "tx_broadcast"	, 4, AR7240_STATS_TXBROAD, },
+	{ "tx_pause"		, 4, AR7240_STATS_TXPAUSE, },
+	{ "tx_multicast"	, 4, AR7240_STATS_TXMULTI, },
+	{ "tx_underrun"		, 4, AR7240_STATS_TXUNDERRUN, },
+	{ "tx_64bytes"		, 4, AR7240_STATS_TX64BYTE, },
+	{ "tx_65_127bytes"	, 4, AR7240_STATS_TX128BYTE, },
+	{ "tx_128_255bytes"	, 4, AR7240_STATS_TX256BYTE, },
+	{ "tx_256_511bytes"	, 4, AR7240_STATS_TX512BYTE, },
+	{ "tx_512_1023bytes"	, 4, AR7240_STATS_TX1024BYTE, },
+	{ "tx_1024_1518bytes"	, 4, AR7240_STATS_TX1518BYTE, },
+	{ "tx_1519_max_bytes"	, 4, AR7240_STATS_TXMAXBYTE, },
+	{ "tx_oversize"		, 4, AR7240_STATS_TXOVERSIZE, },
+	{ "tx_bytes"		, 8, AR7240_STATS_TXBYTE, },
+	{ "tx_collisions"	, 4, AR7240_STATS_TXCOLLISION, },
+	{ "tx_abort_collisions"	, 4, AR7240_STATS_TXABORTCOL, },
+	{ "tx_multi_collisions"	, 4, AR7240_STATS_TXMULTICOL, },
+	{ "tx_single_collisions", 4, AR7240_STATS_TXSINGLECOL, },
+	{ "tx_excessive_deferred", 4, AR7240_STATS_TXEXCDEFER, },
+	{ "tx_deferred"		, 4, AR7240_STATS_TXDEFER, },
+	{ "tx_late_collisions"	, 4, AR7240_STATS_TXLATECOL, },
+};
+
+static void ar7240_dsa_get_strings(struct dsa_switch *ds, int port,
+				   uint8_t *data)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ar7240_hw_stats); i++) {
+		memcpy(data + i * ETH_GSTRING_LEN,
+		       ar7240_hw_stats[i].string, ETH_GSTRING_LEN);
+	}
+}
+
+static void ar7240_dsa_get_ethtool_stats(struct dsa_switch *ds, int port,
+					 uint64_t *data)
+{
+	struct ar7240sw *as = dsa_to_ar7240sw(ds);
+	int err;
+	int i;
+
+	mutex_lock(&as->stats_mutex);
+
+	err = ar7240sw_capture_stats(as);
+	if (err)
+		goto unlock;
+
+	for (i = 0; i < ARRAY_SIZE(ar7240_hw_stats); i++) {
+		const struct ar7240sw_hw_stat *s = &ar7240_hw_stats[i];
+		u32 reg = AR7240_REG_STATS_BASE(port);
+		u32 low;
+		u32 high;
+
+		low = ar7240sw_reg_read(as, reg + s->reg);
+		if (s->sizeof_stat == 8)
+			high = ar7240sw_reg_read(as, reg + s->reg);
+		else
+			high = 0;
+
+		data[i] = (((u64) high) << 32) | low;
+	}
+
+ unlock:
+	mutex_unlock(&as->stats_mutex);
+}
+
+static int ar7240_dsa_get_sset_count(struct dsa_switch *ds)
+{
+	return ARRAY_SIZE(ar7240_hw_stats);
+}
+
+static struct dsa_switch_driver ar7240_dsa_driver = {
+	.tag_protocol		= htons(ETH_P_QINQ),
+	.priv_size		= sizeof(struct ar7240sw),
+	.probe			= ar7240_dsa_probe,
+	.setup			= ar7240_dsa_setup,
+	.set_addr		= ar7240_dsa_set_addr,
+	.phy_read		= ar7240_dsa_phy_read,
+	.phy_write		= ar7240_dsa_phy_write,
+	.poll_link		= ar7240_dsa_poll_link,
+	.get_strings		= ar7240_dsa_get_strings,
+	.get_ethtool_stats	= ar7240_dsa_get_ethtool_stats,
+	.get_sset_count		= ar7240_dsa_get_sset_count,
+};
+
+int __init dsa_ar7240_init(void)
+{
+	register_switch_driver(&ar7240_dsa_driver);
+	return 0;
+}
+module_init(dsa_ar7240_init);
+
+void __exit dsa_ar7240_cleanup(void)
+{
+	unregister_switch_driver(&ar7240_dsa_driver);
+}
+module_exit(dsa_ar7240_cleanup);