X-Git-Url: https://git.rohieb.name/openwrt.git/blobdiff_plain/f7cc8b197ce11b495f5081ae257e90b9aca75858..86b5f9e15f37d932d9bba3b7ef81ade0085c40dd:/target/linux/generic/files/drivers/net/phy/ar8216.c

diff --git a/target/linux/generic/files/drivers/net/phy/ar8216.c b/target/linux/generic/files/drivers/net/phy/ar8216.c
index 93c961c3c..ffa561b36 100644
--- a/target/linux/generic/files/drivers/net/phy/ar8216.c
+++ b/target/linux/generic/files/drivers/net/phy/ar8216.c
@@ -29,6 +29,7 @@
 #include <linux/phy.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
+#include <linux/lockdep.h>
 #include "ar8216.h"
 
 /* size of the vlan table */
@@ -44,6 +45,11 @@ struct ar8216_priv {
 	struct net_device_ops ndo;
 	struct mutex reg_mutex;
 	int chip;
+	bool initialized;
+	bool port4_phy;
+	char buf[80];
+
+	bool init;
 
 	/* all fields below are cleared on reset */
 	bool vlan;
@@ -72,14 +78,20 @@ static u32
 ar8216_mii_read(struct ar8216_priv *priv, int reg)
 {
 	struct phy_device *phy = priv->phy;
+	struct mii_bus *bus = phy->bus;
 	u16 r1, r2, page;
 	u16 lo, hi;
 
 	split_addr((u32) reg, &r1, &r2, &page);
-	phy->bus->write(phy->bus, 0x18, 0, page);
-	msleep(1); /* wait for the page switch to propagate */
-	lo = phy->bus->read(phy->bus, 0x10 | r2, r1);
-	hi = phy->bus->read(phy->bus, 0x10 | r2, r1 + 1);
+
+	mutex_lock(&bus->mdio_lock);
+
+	bus->write(bus, 0x18, 0, page);
+	usleep_range(1000, 2000); /* wait for the page switch to propagate */
+	lo = bus->read(bus, 0x10 | r2, r1);
+	hi = bus->read(bus, 0x10 | r2, r1 + 1);
+
+	mutex_unlock(&bus->mdio_lock);
 
 	return (hi << 16) | lo;
 }
@@ -88,17 +100,34 @@ static void
 ar8216_mii_write(struct ar8216_priv *priv, int reg, u32 val)
 {
 	struct phy_device *phy = priv->phy;
+	struct mii_bus *bus = phy->bus;
 	u16 r1, r2, r3;
 	u16 lo, hi;
 
 	split_addr((u32) reg, &r1, &r2, &r3);
-	phy->bus->write(phy->bus, 0x18, 0, r3);
-	msleep(1); /* wait for the page switch to propagate */
-
 	lo = val & 0xffff;
 	hi = (u16) (val >> 16);
-	phy->bus->write(phy->bus, 0x10 | r2, r1 + 1, hi);
-	phy->bus->write(phy->bus, 0x10 | r2, r1, lo);
+
+	mutex_lock(&bus->mdio_lock);
+
+	bus->write(bus, 0x18, 0, r3);
+	usleep_range(1000, 2000); /* wait for the page switch to propagate */
+	bus->write(bus, 0x10 | r2, r1 + 1, hi);
+	bus->write(bus, 0x10 | r2, r1, lo);
+
+	mutex_unlock(&bus->mdio_lock);
+}
+
+static void
+ar8216_phy_dbg_write(struct ar8216_priv *priv, int phy_addr,
+		     u16 dbg_addr, u16 dbg_data)
+{
+	struct mii_bus *bus = priv->phy->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 u32
@@ -106,6 +135,8 @@ ar8216_rmw(struct ar8216_priv *priv, int reg, u32 mask, u32 val)
 {
 	u32 v;
 
+	lockdep_assert_held(&priv->reg_mutex);
+
 	v = priv->read(priv, reg);
 	v &= ~mask;
 	v |= val;
@@ -121,9 +152,11 @@ ar8216_id_chip(struct ar8216_priv *priv)
 	u16 id;
 	int i;
 
+	priv->chip = UNKNOWN;
+
 	val = ar8216_mii_read(priv, AR8216_REG_CTRL);
 	if (val == ~0)
-		return UNKNOWN;
+		return -ENODEV;
 
 	id = val & (AR8216_CTRL_REVISION | AR8216_CTRL_VERSION);
 	for (i = 0; i < AR8X16_PROBE_RETRIES; i++) {
@@ -131,33 +164,84 @@ ar8216_id_chip(struct ar8216_priv *priv)
 
 		val = ar8216_mii_read(priv, AR8216_REG_CTRL);
 		if (val == ~0)
-			return UNKNOWN;
+			return -ENODEV;
 
 		t = val & (AR8216_CTRL_REVISION | AR8216_CTRL_VERSION);
 		if (t != id)
-			return UNKNOWN;
+			return -ENODEV;
 	}
 
 	switch (id) {
 	case 0x0101:
-		return AR8216;
+		priv->chip = AR8216;
+		break;
+	case 0x0301:
+		priv->chip = AR8236;
+		break;
+	case 0x1000:
 	case 0x1001:
-		return AR8316;
+		priv->chip = AR8316;
+		break;
 	default:
 		printk(KERN_DEBUG
 			"ar8216: Unknown Atheros device [ver=%d, rev=%d, phy_id=%04x%04x]\n",
 			(int)(id >> AR8216_CTRL_VERSION_S),
 			(int)(id & AR8216_CTRL_REVISION),
-			priv->phy->bus->read(priv->phy->bus, priv->phy->addr, 2),
-			priv->phy->bus->read(priv->phy->bus, priv->phy->addr, 3));
+			mdiobus_read(priv->phy->bus, priv->phy->addr, 2),
+			mdiobus_read(priv->phy->bus, priv->phy->addr, 3));
 
-		return UNKNOWN;
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void
+ar8216_read_port_link(struct ar8216_priv *priv, int port,
+		      struct switch_port_link *link)
+{
+	u32 status;
+	u32 speed;
+
+	memset(link, '\0', sizeof(*link));
+
+	status = priv->read(priv, AR8216_REG_PORT_STATUS(port));
+
+	link->aneg = !!(status & AR8216_PORT_STATUS_LINK_AUTO);
+	if (link->aneg) {
+		link->link = !!(status & AR8216_PORT_STATUS_LINK_UP);
+		if (!link->link)
+			return;
+	} else {
+		link->link = true;
+	}
+
+	link->duplex = !!(status & AR8216_PORT_STATUS_DUPLEX);
+	link->tx_flow = !!(status & AR8216_PORT_STATUS_TXFLOW);
+	link->rx_flow = !!(status & AR8216_PORT_STATUS_RXFLOW);
+
+	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 int
 ar8216_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
-                struct switch_val *val)
+		struct switch_val *val)
 {
 	struct ar8216_priv *priv = to_ar8216(dev);
 	priv->vlan = !!val->value.i;
@@ -166,7 +250,7 @@ ar8216_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
 
 static int
 ar8216_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
-                struct switch_val *val)
+		struct switch_val *val)
 {
 	struct ar8216_priv *priv = to_ar8216(dev);
 	val->value.i = priv->vlan;
@@ -198,7 +282,7 @@ ar8216_get_pvid(struct switch_dev *dev, int port, int *vlan)
 
 static int
 ar8216_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
-                struct switch_val *val)
+	       struct switch_val *val)
 {
 	struct ar8216_priv *priv = to_ar8216(dev);
 	priv->vlan_id[val->port_vlan] = val->value.i;
@@ -207,13 +291,22 @@ ar8216_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
 
 static int
 ar8216_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
-                struct switch_val *val)
+	       struct switch_val *val)
 {
 	struct ar8216_priv *priv = to_ar8216(dev);
 	val->value.i = priv->vlan_id[val->port_vlan];
 	return 0;
 }
 
+static int
+ar8216_get_port_link(struct switch_dev *dev, int port,
+		     struct switch_port_link *link)
+{
+	struct ar8216_priv *priv = to_ar8216(dev);
+
+	ar8216_read_port_link(priv, port, link);
+	return 0;
+}
 
 static int
 ar8216_mangle_tx(struct sk_buff *skb, struct net_device *dev)
@@ -221,8 +314,8 @@ ar8216_mangle_tx(struct sk_buff *skb, struct net_device *dev)
 	struct ar8216_priv *priv = dev->phy_ptr;
 	unsigned char *buf;
 
-    if (unlikely(!priv))
-        goto error;
+	if (unlikely(!priv))
+		goto error;
 
 	if (!priv->vlan)
 		goto send;
@@ -373,9 +466,9 @@ ar8216_set_ports(struct switch_dev *dev, struct switch_val *val)
 	for (i = 0; i < val->len; i++) {
 		struct switch_port *p = &val->value.ports[i];
 
-		if (p->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
+		if (p->flags & (1 << SWITCH_PORT_FLAG_TAGGED)) {
 			priv->vlan_tagged |= (1 << p->id);
-		else {
+		} else {
 			priv->vlan_tagged &= ~(1 << p->id);
 			priv->pvid[p->id] = val->port_vlan;
 
@@ -397,14 +490,22 @@ static int
 ar8216_wait_bit(struct ar8216_priv *priv, int reg, u32 mask, u32 val)
 {
 	int timeout = 20;
+	u32 t = 0;
 
-	while ((priv->read(priv, reg) & mask) != val) {
-		if (timeout-- <= 0) {
-			printk(KERN_ERR "ar8216: timeout waiting for operation to complete\n");
-			return 1;
-		}
+	while (1) {
+		t = priv->read(priv, reg);
+		if ((t & mask) == val)
+			return 0;
+
+		if (timeout-- <= 0)
+			break;
+
+		udelay(10);
 	}
-	return 0;
+
+	pr_err("ar8216: timeout on reg %08x: %08x & %08x != %08x\n",
+	       (unsigned int) reg, t, mask, val);
+	return -ETIMEDOUT;
 }
 
 static void
@@ -421,6 +522,56 @@ ar8216_vtu_op(struct ar8216_priv *priv, u32 op, u32 val)
 	priv->write(priv, AR8216_REG_VTU, op);
 }
 
+static void
+ar8216_setup_port(struct ar8216_priv *priv, int port, u32 egress, u32 ingress,
+		  u32 members, u32 pvid)
+{
+	u32 header;
+
+	if (priv->vlan && port == AR8216_PORT_CPU && priv->chip == AR8216)
+		header = AR8216_PORT_CTRL_HEADER;
+	else
+		header = 0;
+
+	ar8216_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));
+
+	ar8216_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 void
+ar8236_setup_port(struct ar8216_priv *priv, int port, u32 egress, u32 ingress,
+		  u32 members, u32 pvid)
+{
+	ar8216_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));
+
+	ar8216_rmw(priv, AR8236_REG_PORT_VLAN(port),
+		   AR8236_PORT_VLAN_DEFAULT_ID,
+		   (pvid << AR8236_PORT_VLAN_DEFAULT_ID_S));
+
+	ar8216_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 int
 ar8216_hw_apply(struct switch_dev *dev)
 {
@@ -433,7 +584,7 @@ ar8216_hw_apply(struct switch_dev *dev)
 	ar8216_vtu_op(priv, AR8216_VTU_OP_FLUSH, 0);
 
 	memset(portmask, 0, sizeof(portmask));
-	if (priv->vlan) {
+	if (!priv->init) {
 		/* calculate the port destination masks and load vlans
 		 * into the vlan translation unit */
 		for (j = 0; j < AR8X16_MAX_VLANS; j++) {
@@ -470,72 +621,95 @@ ar8216_hw_apply(struct switch_dev *dev)
 		int egress, ingress;
 		int pvid;
 
-		if (priv->vlan) {
+		if (priv->vlan)
 			pvid = priv->vlan_id[priv->pvid[i]];
-		} else {
+		else
 			pvid = i;
-		}
 
-		if (priv->vlan && (priv->vlan_tagged & (1 << i))) {
-			egress = AR8216_OUT_ADD_VLAN;
+		if (priv->vlan) {
+			if (priv->vlan_tagged & (1 << i))
+				egress = AR8216_OUT_ADD_VLAN;
+			else
+				egress = AR8216_OUT_STRIP_VLAN;
 		} else {
-			egress = AR8216_OUT_STRIP_VLAN;
+			egress = AR8216_OUT_KEEP;
 		}
-		if (priv->vlan) {
+
+		if (priv->vlan)
 			ingress = AR8216_IN_SECURE;
-		} else {
+		else
 			ingress = AR8216_IN_PORT_ONLY;
-		}
 
-		ar8216_rmw(priv, AR8216_REG_PORT_CTRL(i),
-			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 |
-			  (priv->vlan && i == AR8216_PORT_CPU && (priv->chip == AR8216) ?
-			   AR8216_PORT_CTRL_HEADER : 0) |
-			  (egress << AR8216_PORT_CTRL_VLAN_MODE_S) |
-			  (AR8216_PORT_STATE_FORWARD << AR8216_PORT_CTRL_STATE_S));
-
-		ar8216_rmw(priv, AR8216_REG_PORT_VLAN(i),
-			AR8216_PORT_VLAN_DEST_PORTS | AR8216_PORT_VLAN_MODE |
-			  AR8216_PORT_VLAN_DEFAULT_ID,
-			(portmask[i] << AR8216_PORT_VLAN_DEST_PORTS_S) |
-			  (ingress << AR8216_PORT_VLAN_MODE_S) |
-			  (pvid << AR8216_PORT_VLAN_DEFAULT_ID_S));
+		if (priv->chip == AR8236)
+			ar8236_setup_port(priv, i, egress, ingress, portmask[i],
+					  pvid);
+		else
+			ar8216_setup_port(priv, i, egress, ingress, portmask[i],
+					  pvid);
 	}
 	mutex_unlock(&priv->reg_mutex);
 	return 0;
 }
 
 static int
-ar8316_hw_init(struct ar8216_priv *priv) {
-	static int initialized;
+ar8216_hw_init(struct ar8216_priv *priv)
+{
+	/* XXX: undocumented magic from atheros, required! */
+	priv->write(priv, 0x38, 0xc000050e);
+
+	ar8216_rmw(priv, AR8216_REG_GLOBAL_CTRL,
+		   AR8216_GCTRL_MTU, 1518 + 8 + 2);
+	return 0;
+}
+
+static int
+ar8236_hw_init(struct ar8216_priv *priv)
+{
 	int i;
-	u32 val;
 	struct mii_bus *bus;
 
-	if (initialized)
+	if (priv->initialized)
 		return 0;
 
+	/* Initialize the PHYs */
+	bus = priv->phy->bus;
+	for (i = 0; i < 5; i++) {
+		mdiobus_write(bus, i, MII_ADVERTISE,
+			      ADVERTISE_ALL | ADVERTISE_PAUSE_CAP |
+			      ADVERTISE_PAUSE_ASYM);
+		mdiobus_write(bus, i, MII_BMCR, BMCR_RESET | BMCR_ANENABLE);
+	}
+	msleep(1000);
+
+	/* enable jumbo frames */
+	ar8216_rmw(priv, AR8216_REG_GLOBAL_CTRL,
+		   AR8316_GCTRL_MTU, 9018 + 8 + 2);
+
+	priv->initialized = true;
+	return 0;
+}
+
+static int
+ar8316_hw_init(struct ar8216_priv *priv)
+{
+	int i;
+	u32 val, newval;
+	struct mii_bus *bus;
+
 	val = priv->read(priv, 0x8);
 
 	if (priv->phy->interface == PHY_INTERFACE_MODE_RGMII) {
-		/* value taken from Ubiquiti RouterStation Pro */
-		if (val == 0x81461bea) {
-			/* switch already intialized by bootloader */
-			initialized = true;
-			return 0;
+		if (priv->port4_phy) {
+			/* value taken from Ubiquiti RouterStation Pro */
+			newval = 0x81461bea;
+			printk(KERN_INFO "ar8316: Using port 4 as PHY\n");
+		} else {
+			newval = 0x01261be2;
+			printk(KERN_INFO "ar8316: Using port 4 as switch port\n");
 		}
-		priv->write(priv, 0x8, 0x81461bea);
 	} else if (priv->phy->interface == PHY_INTERFACE_MODE_GMII) {
 		/* value taken from AVM Fritz!Box 7390 sources */
-		if (val == 0x010e5b71) {
-			/* switch already initialized by bootloader */
-			initialized = true;
-			return 0;
-		}
-		priv->write(priv, 0x8, 0x010e5b71);
+		newval = 0x010e5b71;
 	} else {
 		/* no known value for phy interface */
 		printk(KERN_ERR "ar8316: unsupported mii mode: %d.\n",
@@ -543,37 +717,74 @@ ar8316_hw_init(struct ar8216_priv *priv) {
 		return -EINVAL;
 	}
 
+	if (val == newval)
+		goto out;
+
+	priv->write(priv, 0x8, newval);
+
 	/* standard atheros magic */
 	priv->write(priv, 0x38, 0xc000050e);
 
 	/* Initialize the ports */
 	bus = priv->phy->bus;
 	for (i = 0; i < 5; i++) {
-		if ((i == 4) &&
-			priv->phy->interface == PHY_INTERFACE_MODE_RGMII) {
+		if ((i == 4) && priv->port4_phy &&
+		    priv->phy->interface == PHY_INTERFACE_MODE_RGMII) {
 			/* work around for phy4 rgmii mode */
-			bus->write(bus, i, MII_ATH_DBG_ADDR, 0x12);
-			bus->write(bus, i, MII_ATH_DBG_DATA, 0x480c);
+			ar8216_phy_dbg_write(priv, i, 0x12, 0x480c);
 			/* rx delay */
-			bus->write(bus, i, MII_ATH_DBG_ADDR, 0x0);
-			bus->write(bus, i, MII_ATH_DBG_DATA, 0x824e);
+			ar8216_phy_dbg_write(priv, i, 0x0, 0x824e);
 			/* tx delay */
-			bus->write(bus, i, MII_ATH_DBG_ADDR, 0x5);
-			bus->write(bus, i, MII_ATH_DBG_DATA, 0x3d47);
+			ar8216_phy_dbg_write(priv, i, 0x5, 0x3d47);
 			msleep(1000);
 		}
 
 		/* initialize the port itself */
-		bus->write(bus, i, MII_ADVERTISE,
+		mdiobus_write(bus, i, MII_ADVERTISE,
 			ADVERTISE_ALL | ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM);
-		bus->write(bus, i, MII_CTRL1000, ADVERTISE_1000FULL);
-		bus->write(bus, i, MII_BMCR, BMCR_RESET | BMCR_ANENABLE);
+		mdiobus_write(bus, i, MII_CTRL1000, ADVERTISE_1000FULL);
+		mdiobus_write(bus, i, MII_BMCR, BMCR_RESET | BMCR_ANENABLE);
 		msleep(1000);
 	}
-	initialized = true;
+
+	/* enable jumbo frames */
+	ar8216_rmw(priv, AR8216_REG_GLOBAL_CTRL,
+		   AR8316_GCTRL_MTU, 9018 + 8 + 2);
+
+	/* enable cpu port to receive multicast and broadcast frames */
+	priv->write(priv, AR8216_REG_FLOOD_MASK, 0x003f003f);
+
+out:
+	priv->initialized = true;
 	return 0;
 }
 
+static void
+ar8216_init_port(struct ar8216_priv *priv, int port)
+{
+	/* Enable port learning and tx */
+	priv->write(priv, AR8216_REG_PORT_CTRL(port),
+		AR8216_PORT_CTRL_LEARN |
+		(4 << AR8216_PORT_CTRL_STATE_S));
+
+	priv->write(priv, AR8216_REG_PORT_VLAN(port), 0);
+
+	if (port == AR8216_PORT_CPU) {
+		priv->write(priv, AR8216_REG_PORT_STATUS(port),
+			AR8216_PORT_STATUS_LINK_UP |
+			((priv->chip == AR8316) ?
+				AR8216_PORT_SPEED_1000M : AR8216_PORT_SPEED_100M) |
+			AR8216_PORT_STATUS_TXMAC |
+			AR8216_PORT_STATUS_RXMAC |
+			((priv->chip == AR8316) ? AR8216_PORT_STATUS_RXFLOW : 0) |
+			((priv->chip == AR8316) ? AR8216_PORT_STATUS_TXFLOW : 0) |
+			AR8216_PORT_STATUS_DUPLEX);
+	} else {
+		priv->write(priv, AR8216_REG_PORT_STATUS(port),
+			AR8216_PORT_STATUS_LINK_AUTO);
+	}
+}
+
 static int
 ar8216_reset_switch(struct switch_dev *dev)
 {
@@ -583,49 +794,14 @@ ar8216_reset_switch(struct switch_dev *dev)
 	mutex_lock(&priv->reg_mutex);
 	memset(&priv->vlan, 0, sizeof(struct ar8216_priv) -
 		offsetof(struct ar8216_priv, vlan));
-	for (i = 0; i < AR8X16_MAX_VLANS; i++) {
+
+	for (i = 0; i < AR8X16_MAX_VLANS; i++)
 		priv->vlan_id[i] = i;
-	}
-	for (i = 0; i < AR8216_NUM_PORTS; i++) {
-		/* Enable port learning and tx */
-		priv->write(priv, AR8216_REG_PORT_CTRL(i),
-			AR8216_PORT_CTRL_LEARN |
-			(4 << AR8216_PORT_CTRL_STATE_S));
-
-		priv->write(priv, AR8216_REG_PORT_VLAN(i), 0);
-
-		/* Configure all PHYs */
-		if (i == AR8216_PORT_CPU) {
-			priv->write(priv, AR8216_REG_PORT_STATUS(i),
-				AR8216_PORT_STATUS_LINK_UP |
-				((priv->chip == AR8316) ?
-					AR8216_PORT_SPEED_1000M : AR8216_PORT_SPEED_100M) |
-				AR8216_PORT_STATUS_TXMAC |
-				AR8216_PORT_STATUS_RXMAC |
-				((priv->chip == AR8316) ? AR8216_PORT_STATUS_RXFLOW : 0) |
-				((priv->chip == AR8316) ? AR8216_PORT_STATUS_TXFLOW : 0) |
-				AR8216_PORT_STATUS_DUPLEX);
-		} else {
-			priv->write(priv, AR8216_REG_PORT_STATUS(i),
-				AR8216_PORT_STATUS_LINK_AUTO);
-		}
-	}
-	/* XXX: undocumented magic from atheros, required! */
-	priv->write(priv, 0x38, 0xc000050e);
 
-	if (priv->chip == AR8216) {
-		ar8216_rmw(priv, AR8216_REG_GLOBAL_CTRL,
-			AR8216_GCTRL_MTU, 1518 + 8 + 2);
-	} else if (priv->chip == AR8316) {
-		/* enable jumbo frames */
-		ar8216_rmw(priv, AR8216_REG_GLOBAL_CTRL,
-			AR8316_GCTRL_MTU, 9018 + 8 + 2);
-	}
+	/* Configure all ports */
+	for (i = 0; i < AR8216_NUM_PORTS; i++)
+		ar8216_init_port(priv, i);
 
-	if (priv->chip == AR8316) {
-		/* enable cpu port to receive multicast and broadcast frames */
-		priv->write(priv, AR8216_REG_FLOOD_MASK, 0x003f003f);
-	}
 	mutex_unlock(&priv->reg_mutex);
 	return ar8216_hw_apply(dev);
 }
@@ -650,38 +826,66 @@ static const struct switch_dev_ops ar8216_ops = {
 	.set_vlan_ports = ar8216_set_ports,
 	.apply_config = ar8216_hw_apply,
 	.reset_switch = ar8216_reset_switch,
+	.get_port_link = ar8216_get_port_link,
 };
 
 static int
 ar8216_config_init(struct phy_device *pdev)
 {
-	struct ar8216_priv *priv;
+	struct ar8216_priv *priv = pdev->priv;
 	struct net_device *dev = pdev->attached_dev;
 	struct switch_dev *swdev;
 	int ret;
 
-	priv = kzalloc(sizeof(struct ar8216_priv), GFP_KERNEL);
-	if (priv == NULL)
-		return -ENOMEM;
+	if (!priv) {
+		priv = kzalloc(sizeof(struct ar8216_priv), GFP_KERNEL);
+		if (priv == NULL)
+			return -ENOMEM;
+	}
 
 	priv->phy = pdev;
 
-	priv->chip = ar8216_id_chip(priv);
-
-	if (pdev->addr == 0)
-		printk(KERN_INFO "%s: AR%d switch driver attached.\n",
-			pdev->attached_dev->name, priv->chip);
-
+	ret = ar8216_id_chip(priv);
+	if (ret)
+		goto err_free_priv;
 
 	if (pdev->addr != 0) {
 		if (priv->chip == AR8316) {
 			pdev->supported |= SUPPORTED_1000baseT_Full;
 			pdev->advertising |= ADVERTISED_1000baseT_Full;
+
+			/* check if we're attaching to the switch twice */
+			pdev = pdev->bus->phy_map[0];
+			if (!pdev) {
+				kfree(priv);
+				return 0;
+			}
+
+			/* switch device has not been initialized, reuse priv */
+			if (!pdev->priv) {
+				priv->port4_phy = true;
+				pdev->priv = priv;
+				return 0;
+			}
+
+			kfree(priv);
+
+			/* switch device has been initialized, reinit */
+			priv = pdev->priv;
+			priv->dev.ports = (AR8216_NUM_PORTS - 1);
+			priv->initialized = false;
+			priv->port4_phy = true;
+			ar8316_hw_init(priv);
+			return 0;
 		}
+
 		kfree(priv);
 		return 0;
 	}
 
+	printk(KERN_INFO "%s: AR%d switch driver attached.\n",
+		pdev->attached_dev->name, priv->chip);
+
 	pdev->supported = priv->chip == AR8316 ?
 		SUPPORTED_1000baseT_Full : SUPPORTED_100baseT_Full;
 	pdev->advertising = pdev->supported;
@@ -695,36 +899,45 @@ ar8216_config_init(struct phy_device *pdev)
 	swdev = &priv->dev;
 	swdev->cpu_port = AR8216_PORT_CPU;
 	swdev->ops = &ar8216_ops;
+	swdev->ports = AR8216_NUM_PORTS;
 
 	if (priv->chip == AR8316) {
 		swdev->name = "Atheros AR8316";
 		swdev->vlans = AR8X16_MAX_VLANS;
-		/* port 5 connected to the other mac, therefore unusable */
-		swdev->ports = (AR8216_NUM_PORTS - 1);
+
+		if (priv->port4_phy) {
+			/* port 5 connected to the other mac, therefore unusable */
+			swdev->ports = (AR8216_NUM_PORTS - 1);
+		}
+	} else if (priv->chip == AR8236) {
+		swdev->name = "Atheros AR8236";
+		swdev->vlans = AR8216_NUM_VLANS;
+		swdev->ports = AR8216_NUM_PORTS;
 	} else {
 		swdev->name = "Atheros AR8216";
 		swdev->vlans = AR8216_NUM_VLANS;
-		swdev->ports = AR8216_NUM_PORTS;
 	}
 
-	if ((ret = register_switch(&priv->dev, pdev->attached_dev)) < 0) {
-		kfree(priv);
-		goto done;
-	}
+	ret = register_switch(&priv->dev, pdev->attached_dev);
+	if (ret)
+		goto err_free_priv;
 
-	if (priv->chip == AR8316) {
+	priv->init = true;
+
+	ret = 0;
+	if (priv->chip == AR8216)
+		ret = ar8216_hw_init(priv);
+	else if (priv->chip == AR8236)
+		ret = ar8236_hw_init(priv);
+	else if (priv->chip == AR8316)
 		ret = ar8316_hw_init(priv);
-		if (ret) {
-			kfree(priv);
-			goto done;
-		}
-	}
+
+	if (ret)
+		goto err_free_priv;
 
 	ret = ar8216_reset_switch(&priv->dev);
-	if (ret) {
-		kfree(priv);
-		goto done;
-	}
+	if (ret)
+		goto err_free_priv;
 
 	dev->phy_ptr = priv;
 
@@ -739,7 +952,12 @@ ar8216_config_init(struct phy_device *pdev)
 		dev->netdev_ops = &priv->ndo;
 	}
 
-done:
+	priv->init = false;
+
+	return 0;
+
+err_free_priv:
+	kfree(priv);
 	return ret;
 }
 
@@ -747,23 +965,37 @@ static int
 ar8216_read_status(struct phy_device *phydev)
 {
 	struct ar8216_priv *priv = phydev->priv;
+	struct switch_port_link link;
 	int ret;
-	if (phydev->addr != 0) {
+
+	if (phydev->addr != 0)
 		return genphy_read_status(phydev);
-	}
 
-	phydev->speed = priv->chip == AR8316 ? SPEED_1000 : SPEED_100;
-	phydev->duplex = DUPLEX_FULL;
-	phydev->link = 1;
+	ar8216_read_port_link(priv, phydev->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;
 
 	/* flush the address translation unit */
 	mutex_lock(&priv->reg_mutex);
 	ret = ar8216_wait_bit(priv, AR8216_REG_ATU, AR8216_ATU_ACTIVE, 0);
-
 	if (!ret)
 		priv->write(priv, AR8216_REG_ATU, AR8216_ATU_OP_FLUSH);
-	else
-		ret = -ETIMEDOUT;
 	mutex_unlock(&priv->reg_mutex);
 
 	phydev->state = PHY_RUNNING;
@@ -786,14 +1018,9 @@ static int
 ar8216_probe(struct phy_device *pdev)
 {
 	struct ar8216_priv priv;
-	u16 chip;
 
 	priv.phy = pdev;
-	chip = ar8216_id_chip(&priv);
-	if (chip == UNKNOWN)
-		return -ENODEV;
-
-	return 0;
+	return ar8216_id_chip(&priv);
 }
 
 static void
@@ -814,7 +1041,7 @@ ar8216_remove(struct phy_device *pdev)
 
 static struct phy_driver ar8216_driver = {
 	.phy_id		= 0x004d0000,
-	.name		= "Atheros AR8216/AR8316",
+	.name		= "Atheros AR8216/AR8236/AR8316",
 	.phy_id_mask	= 0xffff0000,
 	.features	= PHY_BASIC_FEATURES,
 	.probe		= ar8216_probe,