openwrt/target/linux/lantiq/patches-3.9/0010-NET-MIPS-lantiq-update-etop-driver-for-devicetree.patch

From fd69e82feee0966fd61374ea76d6ff36ce42e51c Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sat, 29 Jun 2013 19:42:16 +0200
Subject: [PATCH 10/22] NET: MIPS: lantiq: update etop driver for devicetree

---
 drivers/net/ethernet/lantiq_etop.c |  500 +++++++++++++++++++++++++-----------
 1 file changed, 354 insertions(+), 146 deletions(-)

--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -12,7 +12,7 @@
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  *
- *   Copyright (C) 2011 John Crispin <blogic@openwrt.org>
+ *   Copyright (C) 2011-12 John Crispin <blogic@openwrt.org>
  */
 
 #include <linux/kernel.h>
@@ -36,6 +36,10 @@
 #include <linux/io.h>
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/of_net.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
 
 #include <asm/checksum.h>
 
@@ -71,25 +75,61 @@
 #define ETOP_MII_REVERSE	0xe
 #define ETOP_PLEN_UNDER		0x40
 #define ETOP_CGEN		0x800
+#define ETOP_CFG_MII0		0x01
 
-/* use 2 static channels for TX/RX */
-#define LTQ_ETOP_TX_CHANNEL	1
-#define LTQ_ETOP_RX_CHANNEL	6
-#define IS_TX(x)		(x == LTQ_ETOP_TX_CHANNEL)
-#define IS_RX(x)		(x == LTQ_ETOP_RX_CHANNEL)
+#define LTQ_GBIT_MDIO_CTL	0xCC
+#define LTQ_GBIT_MDIO_DATA	0xd0
+#define LTQ_GBIT_GCTL0		0x68
+#define LTQ_GBIT_PMAC_HD_CTL	0x8c
+#define LTQ_GBIT_P0_CTL		0x4
+#define LTQ_GBIT_PMAC_RX_IPG	0xa8
+#define LTQ_GBIT_RGMII_CTL	0x78
+
+#define PMAC_HD_CTL_AS		(1 << 19)
+#define PMAC_HD_CTL_RXSH	(1 << 22)
+
+/* Switch Enable (0=disable, 1=enable) */
+#define GCTL0_SE		0x80000000
+/* Disable MDIO auto polling (0=disable, 1=enable) */
+#define PX_CTL_DMDIO		0x00400000
+
+/* MDC clock divider, clock = 25MHz/((MDC_CLOCK + 1) * 2) */
+#define MDC_CLOCK_MASK		0xff000000
+#define MDC_CLOCK_OFFSET	24
+
+/* register information for the gbit's MDIO bus */
+#define MDIO_XR9_REQUEST	0x00008000
+#define MDIO_XR9_READ		0x00000800
+#define MDIO_XR9_WRITE		0x00000400
+#define MDIO_XR9_REG_MASK	0x1f
+#define MDIO_XR9_ADDR_MASK	0x1f
+#define MDIO_XR9_RD_MASK	0xffff
+#define MDIO_XR9_REG_OFFSET	0
+#define MDIO_XR9_ADDR_OFFSET	5
+#define MDIO_XR9_WR_OFFSET	16
 
+#define LTQ_DMA_ETOP	((of_machine_is_compatible("lantiq,ase")) ? \
+			(INT_NUM_IM3_IRL0) : (INT_NUM_IM2_IRL0))
+
+/* the newer xway socks have a embedded 3/7 port gbit multiplexer */
 #define ltq_etop_r32(x)		ltq_r32(ltq_etop_membase + (x))
 #define ltq_etop_w32(x, y)	ltq_w32(x, ltq_etop_membase + (y))
 #define ltq_etop_w32_mask(x, y, z)	\
 		ltq_w32_mask(x, y, ltq_etop_membase + (z))
 
-#define DRV_VERSION	"1.0"
+#define ltq_gbit_r32(x)		ltq_r32(ltq_gbit_membase + (x))
+#define ltq_gbit_w32(x, y)	ltq_w32(x, ltq_gbit_membase + (y))
+#define ltq_gbit_w32_mask(x, y, z)	\
+		ltq_w32_mask(x, y, ltq_gbit_membase + (z))
+
+#define DRV_VERSION	"1.2"
 
 static void __iomem *ltq_etop_membase;
+static void __iomem *ltq_gbit_membase;
 
 struct ltq_etop_chan {
-	int idx;
 	int tx_free;
+	int irq;
 	struct net_device *netdev;
 	struct napi_struct napi;
 	struct ltq_dma_channel dma;
@@ -99,22 +139,35 @@ struct ltq_etop_chan {
 struct ltq_etop_priv {
 	struct net_device *netdev;
 	struct platform_device *pdev;
-	struct ltq_eth_data *pldata;
 	struct resource *res;
 
 	struct mii_bus *mii_bus;
 	struct phy_device *phydev;
 
-	struct ltq_etop_chan ch[MAX_DMA_CHAN];
-	int tx_free[MAX_DMA_CHAN >> 1];
+	struct ltq_etop_chan txch;
+	struct ltq_etop_chan rxch;
+
+	int tx_irq;
+	int rx_irq;
+
+	const void *mac;
+	int mii_mode;
 
 	spinlock_t lock;
+
+	struct clk *clk_ppe;
+	struct clk *clk_switch;
+	struct clk *clk_ephy;
+	struct clk *clk_ephycgu;
 };
 
+static int ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr,
+				int phy_reg, u16 phy_data);
+
 static int
 ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
 {
-	ch->skb[ch->dma.desc] = netdev_alloc_skb(ch->netdev, MAX_DMA_DATA_LEN);
+	ch->skb[ch->dma.desc] = dev_alloc_skb(MAX_DMA_DATA_LEN);
 	if (!ch->skb[ch->dma.desc])
 		return -ENOMEM;
 	ch->dma.desc_base[ch->dma.desc].addr = dma_map_single(NULL,
@@ -149,8 +202,11 @@ ltq_etop_hw_receive(struct ltq_etop_chan
 	spin_unlock_irqrestore(&priv->lock, flags);
 
 	skb_put(skb, len);
+	skb->dev = ch->netdev;
 	skb->protocol = eth_type_trans(skb, ch->netdev);
 	netif_receive_skb(skb);
+	ch->netdev->stats.rx_packets++;
+	ch->netdev->stats.rx_bytes += len;
 }
 
 static int
@@ -158,8 +214,10 @@ ltq_etop_poll_rx(struct napi_struct *nap
 {
 	struct ltq_etop_chan *ch = container_of(napi,
 				struct ltq_etop_chan, napi);
+	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 	int rx = 0;
 	int complete = 0;
+	unsigned long flags;
 
 	while ((rx < budget) && !complete) {
 		struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
@@ -173,7 +231,9 @@ ltq_etop_poll_rx(struct napi_struct *nap
 	}
 	if (complete || !rx) {
 		napi_complete(&ch->napi);
+		spin_lock_irqsave(&priv->lock, flags);
 		ltq_dma_ack_irq(&ch->dma);
+		spin_unlock_irqrestore(&priv->lock, flags);
 	}
 	return rx;
 }
@@ -185,12 +245,14 @@ ltq_etop_poll_tx(struct napi_struct *nap
 		container_of(napi, struct ltq_etop_chan, napi);
 	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 	struct netdev_queue *txq =
-		netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
+		netdev_get_tx_queue(ch->netdev, ch->dma.nr >> 1);
 	unsigned long flags;
 
 	spin_lock_irqsave(&priv->lock, flags);
 	while ((ch->dma.desc_base[ch->tx_free].ctl &
 			(LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
+		ch->netdev->stats.tx_packets++;
+		ch->netdev->stats.tx_bytes += ch->skb[ch->tx_free]->len;
 		dev_kfree_skb_any(ch->skb[ch->tx_free]);
 		ch->skb[ch->tx_free] = NULL;
 		memset(&ch->dma.desc_base[ch->tx_free], 0,
@@ -203,7 +265,9 @@ ltq_etop_poll_tx(struct napi_struct *nap
 	if (netif_tx_queue_stopped(txq))
 		netif_tx_start_queue(txq);
 	napi_complete(&ch->napi);
+	spin_lock_irqsave(&priv->lock, flags);
 	ltq_dma_ack_irq(&ch->dma);
+	spin_unlock_irqrestore(&priv->lock, flags);
 	return 1;
 }
 
@@ -211,9 +275,10 @@ static irqreturn_t
 ltq_etop_dma_irq(int irq, void *_priv)
 {
 	struct ltq_etop_priv *priv = _priv;
-	int ch = irq - LTQ_DMA_CH0_INT;
-
-	napi_schedule(&priv->ch[ch].napi);
+	if (irq == priv->txch.dma.irq)
+		napi_schedule(&priv->txch.napi);
+	else
+		napi_schedule(&priv->rxch.napi);
 	return IRQ_HANDLED;
 }
 
@@ -225,7 +290,7 @@ ltq_etop_free_channel(struct net_device
 	ltq_dma_free(&ch->dma);
 	if (ch->dma.irq)
 		free_irq(ch->dma.irq, priv);
-	if (IS_RX(ch->idx)) {
+	if (ch == &priv->txch) {
 		int desc;
 		for (desc = 0; desc < LTQ_DESC_NUM; desc++)
 			dev_kfree_skb_any(ch->skb[ch->dma.desc]);
@@ -236,23 +301,62 @@ static void
 ltq_etop_hw_exit(struct net_device *dev)
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
 
-	ltq_pmu_disable(PMU_PPE);
-	for (i = 0; i < MAX_DMA_CHAN; i++)
-		if (IS_TX(i) || IS_RX(i))
-			ltq_etop_free_channel(dev, &priv->ch[i]);
+	clk_disable(priv->clk_ppe);
+
+	if (of_machine_is_compatible("lantiq,ar9"))
+		clk_disable(priv->clk_switch);
+
+	if (of_machine_is_compatible("lantiq,ase")) {
+		clk_disable(priv->clk_ephy);
+		clk_disable(priv->clk_ephycgu);
+	}
+
+	ltq_etop_free_channel(dev, &priv->txch);
+	ltq_etop_free_channel(dev, &priv->rxch);
+}
+
+static void
+ltq_etop_gbit_init(struct net_device *dev)
+{
+	struct ltq_etop_priv *priv = netdev_priv(dev);
+
+	clk_enable(priv->clk_switch);
+
+	/* enable gbit port0 on the SoC */
+	ltq_gbit_w32_mask((1 << 17), (1 << 18), LTQ_GBIT_P0_CTL);
+
+	ltq_gbit_w32_mask(0, GCTL0_SE, LTQ_GBIT_GCTL0);
+	/* disable MDIO auto polling mode */
+	ltq_gbit_w32_mask(0, PX_CTL_DMDIO, LTQ_GBIT_P0_CTL);
+	/* set 1522 packet size */
+	ltq_gbit_w32_mask(0x300, 0, LTQ_GBIT_GCTL0);
+	/* disable pmac & dmac headers */
+	ltq_gbit_w32_mask(PMAC_HD_CTL_AS | PMAC_HD_CTL_RXSH, 0,
+		LTQ_GBIT_PMAC_HD_CTL);
+	/* Due to traffic halt when burst length 8,
+		replace default IPG value with 0x3B */
+	ltq_gbit_w32(0x3B, LTQ_GBIT_PMAC_RX_IPG);
+	/* set mdc clock to 2.5 MHz */
+	ltq_gbit_w32_mask(MDC_CLOCK_MASK, 4 << MDC_CLOCK_OFFSET,
+		LTQ_GBIT_RGMII_CTL);
 }
 
 static int
 ltq_etop_hw_init(struct net_device *dev)
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
+	int mii_mode = priv->mii_mode;
 
-	ltq_pmu_enable(PMU_PPE);
+	clk_enable(priv->clk_ppe);
 
-	switch (priv->pldata->mii_mode) {
+	if (of_machine_is_compatible("lantiq,ar9")) {
+		ltq_etop_gbit_init(dev);
+		/* force the etops link to the gbit to MII */
+		mii_mode = PHY_INTERFACE_MODE_MII;
+	}
+
+	switch (mii_mode) {
 	case PHY_INTERFACE_MODE_RMII:
 		ltq_etop_w32_mask(ETOP_MII_MASK,
 			ETOP_MII_REVERSE, LTQ_ETOP_CFG);
@@ -264,39 +368,68 @@ ltq_etop_hw_init(struct net_device *dev)
 		break;
 
 	default:
+		if (of_machine_is_compatible("lantiq,ase")) {
+			clk_enable(priv->clk_ephy);
+			/* disable external MII */
+			ltq_etop_w32_mask(0, ETOP_CFG_MII0, LTQ_ETOP_CFG);
+			/* enable clock for internal PHY */
+			clk_enable(priv->clk_ephycgu);
+			/* we need to write this magic to the internal phy to
+			   make it work */
+			ltq_etop_mdio_wr(NULL, 0x8, 0x12, 0xC020);
+			pr_info("Selected EPHY mode\n");
+			break;
+		}
 		netdev_err(dev, "unknown mii mode %d\n",
-			priv->pldata->mii_mode);
+			mii_mode);
 		return -ENOTSUPP;
 	}
 
 	/* enable crc generation */
 	ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG);
 
+	return 0;
+}
+
+static int
+ltq_etop_dma_init(struct net_device *dev)
+{
+	struct ltq_etop_priv *priv = netdev_priv(dev);
+	int tx = priv->tx_irq - LTQ_DMA_ETOP;
+	int rx = priv->rx_irq - LTQ_DMA_ETOP;
+	int err;
+
 	ltq_dma_init_port(DMA_PORT_ETOP);
 
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		int irq = LTQ_DMA_CH0_INT + i;
-		struct ltq_etop_chan *ch = &priv->ch[i];
-
-		ch->idx = ch->dma.nr = i;
-
-		if (IS_TX(i)) {
-			ltq_dma_alloc_tx(&ch->dma);
-			request_irq(irq, ltq_etop_dma_irq, IRQF_DISABLED,
-				"etop_tx", priv);
-		} else if (IS_RX(i)) {
-			ltq_dma_alloc_rx(&ch->dma);
-			for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM;
-					ch->dma.desc++)
-				if (ltq_etop_alloc_skb(ch))
-					return -ENOMEM;
-			ch->dma.desc = 0;
-			request_irq(irq, ltq_etop_dma_irq, IRQF_DISABLED,
-				"etop_rx", priv);
+	priv->txch.dma.nr = tx;
+	ltq_dma_alloc_tx(&priv->txch.dma);
+	err = request_irq(priv->tx_irq, ltq_etop_dma_irq, IRQF_DISABLED,
+		"eth_tx", priv);
+	if (err) {
+		netdev_err(dev, "failed to allocate tx irq\n");
+		goto err_out;
+	}
+	priv->txch.dma.irq = priv->tx_irq;
+
+	priv->rxch.dma.nr = rx;
+	ltq_dma_alloc_rx(&priv->rxch.dma);
+	for (priv->rxch.dma.desc = 0; priv->rxch.dma.desc < LTQ_DESC_NUM;
+			priv->rxch.dma.desc++) {
+		if (ltq_etop_alloc_skb(&priv->rxch)) {
+			netdev_err(dev, "failed to allocate skbs\n");
+			err = -ENOMEM;
+			goto err_out;
 		}
-		ch->dma.irq = irq;
 	}
-	return 0;
+	priv->rxch.dma.desc = 0;
+	err = request_irq(priv->rx_irq, ltq_etop_dma_irq, IRQF_DISABLED,
+		"eth_rx", priv);
+	if (err)
+		netdev_err(dev, "failed to allocate rx irq\n");
+	else
+		priv->rxch.dma.irq = priv->rx_irq;
+err_out:
+	return err;
 }
 
 static void
@@ -312,7 +445,10 @@ ltq_etop_get_settings(struct net_device
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
 
-	return phy_ethtool_gset(priv->phydev, cmd);
+	if (priv->phydev)
+		return phy_ethtool_gset(priv->phydev, cmd);
+	else
+		return 0;
 }
 
 static int
@@ -320,7 +456,10 @@ ltq_etop_set_settings(struct net_device
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
 
-	return phy_ethtool_sset(priv->phydev, cmd);
+	if (priv->phydev)
+		return phy_ethtool_sset(priv->phydev, cmd);
+	else
+		return 0;
 }
 
 static int
@@ -328,7 +467,10 @@ ltq_etop_nway_reset(struct net_device *d
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
 
-	return phy_start_aneg(priv->phydev);
+	if (priv->phydev)
+		return phy_start_aneg(priv->phydev);
+	else
+		return 0;
 }
 
 static const struct ethtool_ops ltq_etop_ethtool_ops = {
@@ -339,6 +481,39 @@ static const struct ethtool_ops ltq_etop
 };
 
 static int
+ltq_etop_mdio_wr_xr9(struct mii_bus *bus, int phy_addr,
+		int phy_reg, u16 phy_data)
+{
+	u32 val = MDIO_XR9_REQUEST | MDIO_XR9_WRITE |
+		(phy_data << MDIO_XR9_WR_OFFSET) |
+		((phy_addr & MDIO_XR9_ADDR_MASK) << MDIO_XR9_ADDR_OFFSET) |
+		((phy_reg & MDIO_XR9_REG_MASK) << MDIO_XR9_REG_OFFSET);
+
+	while (ltq_gbit_r32(LTQ_GBIT_MDIO_CTL) & MDIO_XR9_REQUEST)
+		;
+	ltq_gbit_w32(val, LTQ_GBIT_MDIO_CTL);
+	while (ltq_gbit_r32(LTQ_GBIT_MDIO_CTL) & MDIO_XR9_REQUEST)
+		;
+	return 0;
+}
+
+static int
+ltq_etop_mdio_rd_xr9(struct mii_bus *bus, int phy_addr, int phy_reg)
+{
+	u32 val = MDIO_XR9_REQUEST | MDIO_XR9_READ |
+		((phy_addr & MDIO_XR9_ADDR_MASK) << MDIO_XR9_ADDR_OFFSET) |
+		((phy_reg & MDIO_XR9_REG_MASK) << MDIO_XR9_REG_OFFSET);
+
+	while (ltq_gbit_r32(LTQ_GBIT_MDIO_CTL) & MDIO_XR9_REQUEST)
+		;
+	ltq_gbit_w32(val, LTQ_GBIT_MDIO_CTL);
+	while (ltq_gbit_r32(LTQ_GBIT_MDIO_CTL) & MDIO_XR9_REQUEST)
+		;
+	val = ltq_gbit_r32(LTQ_GBIT_MDIO_DATA) & MDIO_XR9_RD_MASK;
+	return val;
+}
+
+static int
 ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
 {
 	u32 val = MDIO_REQUEST |
@@ -379,14 +554,18 @@ ltq_etop_mdio_probe(struct net_device *d
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
 	struct phy_device *phydev = NULL;
-	int phy_addr;
+	u32 phy_supported =  (SUPPORTED_10baseT_Half
+			| SUPPORTED_10baseT_Full
+			| SUPPORTED_100baseT_Half
+			| SUPPORTED_100baseT_Full
+			| SUPPORTED_Autoneg
+			| SUPPORTED_MII
+			| SUPPORTED_TP);
 
-	for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
-		if (priv->mii_bus->phy_map[phy_addr]) {
-			phydev = priv->mii_bus->phy_map[phy_addr];
-			break;
-		}
-	}
+	if (of_machine_is_compatible("lantiq,ase"))
+		phydev = priv->mii_bus->phy_map[8];
+	else
+		phydev = priv->mii_bus->phy_map[0];
 
 	if (!phydev) {
 		netdev_err(dev, "no PHY found\n");
@@ -394,21 +573,18 @@ ltq_etop_mdio_probe(struct net_device *d
 	}
 
 	phydev = phy_connect(dev, dev_name(&phydev->dev),
-			     &ltq_etop_mdio_link, priv->pldata->mii_mode);
+			&ltq_etop_mdio_link, priv->mii_mode);
 
 	if (IS_ERR(phydev)) {
 		netdev_err(dev, "Could not attach to PHY\n");
 		return PTR_ERR(phydev);
 	}
 
-	phydev->supported &= (SUPPORTED_10baseT_Half
-			      | SUPPORTED_10baseT_Full
-			      | SUPPORTED_100baseT_Half
-			      | SUPPORTED_100baseT_Full
-			      | SUPPORTED_Autoneg
-			      | SUPPORTED_MII
-			      | SUPPORTED_TP);
+	if (of_machine_is_compatible("lantiq,ar9"))
+		phy_supported |= SUPPORTED_1000baseT_Half
+			| SUPPORTED_1000baseT_Full;
 
+	phydev->supported &= phy_supported;
 	phydev->advertising = phydev->supported;
 	priv->phydev = phydev;
 	pr_info("%s: attached PHY [%s] (phy_addr=%s, irq=%d)\n",
@@ -433,8 +609,13 @@ ltq_etop_mdio_init(struct net_device *de
 	}
 
 	priv->mii_bus->priv = dev;
-	priv->mii_bus->read = ltq_etop_mdio_rd;
-	priv->mii_bus->write = ltq_etop_mdio_wr;
+	if (of_machine_is_compatible("lantiq,ar9")) {
+		priv->mii_bus->read = ltq_etop_mdio_rd_xr9;
+		priv->mii_bus->write = ltq_etop_mdio_wr_xr9;
+	} else {
+		priv->mii_bus->read = ltq_etop_mdio_rd;
+		priv->mii_bus->write = ltq_etop_mdio_wr;
+	}
 	priv->mii_bus->name = "ltq_mii";
 	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
 		priv->pdev->name, priv->pdev->id);
@@ -483,17 +664,19 @@ static int
 ltq_etop_open(struct net_device *dev)
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
+	unsigned long flags;
 
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		struct ltq_etop_chan *ch = &priv->ch[i];
+	napi_enable(&priv->txch.napi);
+	napi_enable(&priv->rxch.napi);
+
+	spin_lock_irqsave(&priv->lock, flags);
+	ltq_dma_open(&priv->txch.dma);
+	ltq_dma_open(&priv->rxch.dma);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	if (priv->phydev)
+		phy_start(priv->phydev);
 
-		if (!IS_TX(i) && (!IS_RX(i)))
-			continue;
-		ltq_dma_open(&ch->dma);
-		napi_enable(&ch->napi);
-	}
-	phy_start(priv->phydev);
 	netif_tx_start_all_queues(dev);
 	return 0;
 }
@@ -502,18 +685,19 @@ static int
 ltq_etop_stop(struct net_device *dev)
 {
 	struct ltq_etop_priv *priv = netdev_priv(dev);
-	int i;
+	unsigned long flags;
 
 	netif_tx_stop_all_queues(dev);
-	phy_stop(priv->phydev);
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		struct ltq_etop_chan *ch = &priv->ch[i];
-
-		if (!IS_RX(i) && !IS_TX(i))
-			continue;
-		napi_disable(&ch->napi);
-		ltq_dma_close(&ch->dma);
-	}
+	if (priv->phydev)
+		phy_stop(priv->phydev);
+	napi_disable(&priv->txch.napi);
+	napi_disable(&priv->rxch.napi);
+
+	spin_lock_irqsave(&priv->lock, flags);
+	ltq_dma_close(&priv->txch.dma);
+	ltq_dma_close(&priv->rxch.dma);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
 	return 0;
 }
 
@@ -523,16 +707,16 @@ ltq_etop_tx(struct sk_buff *skb, struct
 	int queue = skb_get_queue_mapping(skb);
 	struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
 	struct ltq_etop_priv *priv = netdev_priv(dev);
-	struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
-	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
-	int len;
+	struct ltq_dma_desc *desc =
+		&priv->txch.dma.desc_base[priv->txch.dma.desc];
 	unsigned long flags;
 	u32 byte_offset;
+	int len;
 
 	len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 
-	if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
-		dev_kfree_skb_any(skb);
+	if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) ||
+			priv->txch.skb[priv->txch.dma.desc]) {
 		netdev_err(dev, "tx ring full\n");
 		netif_tx_stop_queue(txq);
 		return NETDEV_TX_BUSY;
@@ -540,7 +724,7 @@ ltq_etop_tx(struct sk_buff *skb, struct
 
 	/* dma needs to start on a 16 byte aligned address */
 	byte_offset = CPHYSADDR(skb->data) % 16;
-	ch->skb[ch->dma.desc] = skb;
+	priv->txch.skb[priv->txch.dma.desc] = skb;
 
 	dev->trans_start = jiffies;
 
@@ -550,11 +734,11 @@ ltq_etop_tx(struct sk_buff *skb, struct
 	wmb();
 	desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
 		LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
-	ch->dma.desc++;
-	ch->dma.desc %= LTQ_DESC_NUM;
+	priv->txch.dma.desc++;
+	priv->txch.dma.desc %= LTQ_DESC_NUM;
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
+	if (priv->txch.dma.desc_base[priv->txch.dma.desc].ctl & LTQ_DMA_OWN)
 		netif_tx_stop_queue(txq);
 
 	return NETDEV_TX_OK;
@@ -633,34 +817,33 @@ ltq_etop_init(struct net_device *dev)
 	struct ltq_etop_priv *priv = netdev_priv(dev);
 	struct sockaddr mac;
 	int err;
-	bool random_mac = false;
 
 	ether_setup(dev);
 	dev->watchdog_timeo = 10 * HZ;
 	err = ltq_etop_hw_init(dev);
 	if (err)
 		goto err_hw;
+	err = ltq_etop_dma_init(dev);
+	if (err)
+		goto err_hw;
+
 	ltq_etop_change_mtu(dev, 1500);
 
-	memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
+	if (priv->mac)
+		memcpy(&mac.sa_data, priv->mac, ETH_ALEN);
 	if (!is_valid_ether_addr(mac.sa_data)) {
 		pr_warn("etop: invalid MAC, using random\n");
-		eth_random_addr(mac.sa_data);
-		random_mac = true;
+		random_ether_addr(mac.sa_data);
 	}
 
 	err = ltq_etop_set_mac_address(dev, &mac);
 	if (err)
 		goto err_netdev;
-
-	/* Set addr_assign_type here, ltq_etop_set_mac_address would reset it. */
-	if (random_mac)
-		dev->addr_assign_type = NET_ADDR_RANDOM;
-
 	ltq_etop_set_multicast_list(dev);
-	err = ltq_etop_mdio_init(dev);
-	if (err)
-		goto err_netdev;
+	if (!ltq_etop_mdio_init(dev))
+		dev->ethtool_ops = &ltq_etop_ethtool_ops;
+	else
+		pr_warn("etop: mdio probe failed\n");;
 	return 0;
 
 err_netdev:
@@ -680,6 +863,9 @@ ltq_etop_tx_timeout(struct net_device *d
 	err = ltq_etop_hw_init(dev);
 	if (err)
 		goto err_hw;
+	err = ltq_etop_dma_init(dev);
+	if (err)
+		goto err_hw;
 	dev->trans_start = jiffies;
 	netif_wake_queue(dev);
 	return;
@@ -703,14 +889,18 @@ static const struct net_device_ops ltq_e
 	.ndo_tx_timeout = ltq_etop_tx_timeout,
 };
 
-static int __init
-ltq_etop_probe(struct platform_device *pdev)
+static int ltq_etop_probe(struct platform_device *pdev)
 {
 	struct net_device *dev;
 	struct ltq_etop_priv *priv;
-	struct resource *res;
+	struct resource *res, *gbit_res, irqres[2];
 	int err;
-	int i;
+
+	err = of_irq_to_resource_table(pdev->dev.of_node, irqres, 2);
+	if (err != 2) {
+		dev_err(&pdev->dev, "failed to get etop irqs\n");
+		return -EINVAL;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
@@ -736,30 +926,60 @@ ltq_etop_probe(struct platform_device *p
 		goto err_out;
 	}
 
-	dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
-	if (!dev) {
-		err = -ENOMEM;
-		goto err_out;
+	if (of_machine_is_compatible("lantiq,ar9")) {
+		gbit_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+		if (!gbit_res) {
+			dev_err(&pdev->dev, "failed to get gbit resource\n");
+			err = -ENOENT;
+			goto err_out;
+		}
+		ltq_gbit_membase = devm_ioremap_nocache(&pdev->dev,
+			gbit_res->start, resource_size(gbit_res));
+		if (!ltq_gbit_membase) {
+			dev_err(&pdev->dev, "failed to remap gigabit switch %d\n",
+				pdev->id);
+			err = -ENOMEM;
+			goto err_out;
+		}
 	}
+
+	dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
 	strcpy(dev->name, "eth%d");
 	dev->netdev_ops = &ltq_eth_netdev_ops;
-	dev->ethtool_ops = &ltq_etop_ethtool_ops;
 	priv = netdev_priv(dev);
 	priv->res = res;
 	priv->pdev = pdev;
-	priv->pldata = dev_get_platdata(&pdev->dev);
 	priv->netdev = dev;
+	priv->tx_irq = irqres[0].start;
+	priv->rx_irq = irqres[1].start;
+	priv->mii_mode = of_get_phy_mode(pdev->dev.of_node);
+	priv->mac = ltq_get_eth_mac();
+	if (!priv->mac)
+		priv->mac = of_get_mac_address(pdev->dev.of_node);
+
+	priv->clk_ppe = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->clk_ppe))
+		return PTR_ERR(priv->clk_ppe);
+	if (of_machine_is_compatible("lantiq,ar9")) {
+		priv->clk_switch = clk_get(&pdev->dev, "switch");
+		if (IS_ERR(priv->clk_switch))
+			return PTR_ERR(priv->clk_switch);
+	}
+	if (of_machine_is_compatible("lantiq,ase")) {
+		priv->clk_ephy = clk_get(&pdev->dev, "ephy");
+		if (IS_ERR(priv->clk_ephy))
+			return PTR_ERR(priv->clk_ephy);
+		priv->clk_ephycgu = clk_get(&pdev->dev, "ephycgu");
+		if (IS_ERR(priv->clk_ephycgu))
+			return PTR_ERR(priv->clk_ephycgu);
+	}
+
 	spin_lock_init(&priv->lock);
 
-	for (i = 0; i < MAX_DMA_CHAN; i++) {
-		if (IS_TX(i))
-			netif_napi_add(dev, &priv->ch[i].napi,
-				ltq_etop_poll_tx, 8);
-		else if (IS_RX(i))
-			netif_napi_add(dev, &priv->ch[i].napi,
-				ltq_etop_poll_rx, 32);
-		priv->ch[i].netdev = dev;
-	}
+	netif_napi_add(dev, &priv->txch.napi, ltq_etop_poll_tx, 8);
+	netif_napi_add(dev, &priv->rxch.napi, ltq_etop_poll_rx, 32);
+	priv->txch.netdev = dev;
+	priv->rxch.netdev = dev;
 
 	err = register_netdev(dev);
 	if (err)
@@ -788,32 +1008,23 @@ ltq_etop_remove(struct platform_device *
 	return 0;
 }
 
+static const struct of_device_id ltq_etop_match[] = {
+	{ .compatible = "lantiq,etop-xway" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ltq_etop_match);
+
 static struct platform_driver ltq_mii_driver = {
+	.probe = ltq_etop_probe,
 	.remove = ltq_etop_remove,
 	.driver = {
 		.name = "ltq_etop",
 		.owner = THIS_MODULE,
+		.of_match_table = ltq_etop_match,
 	},
 };
 
-int __init
-init_ltq_etop(void)
-{
-	int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);
-
-	if (ret)
-		pr_err("ltq_etop: Error registering platform driver!");
-	return ret;
-}
-
-static void __exit
-exit_ltq_etop(void)
-{
-	platform_driver_unregister(&ltq_mii_driver);
-}
-
-module_init(init_ltq_etop);
-module_exit(exit_ltq_etop);
+module_platform_driver(ltq_mii_driver);
 
 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 MODULE_DESCRIPTION("Lantiq SoC ETOP");