Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1625 insertions, 0 deletions

diff --git a/drivers/net/ethernet/actions/owl-emac.c b/drivers/net/ethernet/actions/owl-emac.c
new file mode 100644
index 000000000..cd4d71b83
--- /dev/null
+++ b/drivers/net/ethernet/actions/owl-emac.c
@@ -0,0 +1,1625 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Actions Semi Owl SoCs Ethernet MAC driver
+ *
+ * Copyright (c) 2012 Actions Semi Inc.
+ * Copyright (c) 2021 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
+ */
+
+#include <linux/circ_buf.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/etherdevice.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/reset.h>
+
+#include "owl-emac.h"
+
+#define OWL_EMAC_DEFAULT_MSG_ENABLE	(NETIF_MSG_DRV | \
+					 NETIF_MSG_PROBE | \
+					 NETIF_MSG_LINK)
+
+static u32 owl_emac_reg_read(struct owl_emac_priv *priv, u32 reg)
+{
+	return readl(priv->base + reg);
+}
+
+static void owl_emac_reg_write(struct owl_emac_priv *priv, u32 reg, u32 data)
+{
+	writel(data, priv->base + reg);
+}
+
+static u32 owl_emac_reg_update(struct owl_emac_priv *priv,
+			       u32 reg, u32 mask, u32 val)
+{
+	u32 data, old_val;
+
+	data = owl_emac_reg_read(priv, reg);
+	old_val = data & mask;
+
+	data &= ~mask;
+	data |= val & mask;
+
+	owl_emac_reg_write(priv, reg, data);
+
+	return old_val;
+}
+
+static void owl_emac_reg_set(struct owl_emac_priv *priv, u32 reg, u32 bits)
+{
+	owl_emac_reg_update(priv, reg, bits, bits);
+}
+
+static void owl_emac_reg_clear(struct owl_emac_priv *priv, u32 reg, u32 bits)
+{
+	owl_emac_reg_update(priv, reg, bits, 0);
+}
+
+static struct device *owl_emac_get_dev(struct owl_emac_priv *priv)
+{
+	return priv->netdev->dev.parent;
+}
+
+static void owl_emac_irq_enable(struct owl_emac_priv *priv)
+{
+	/* Enable all interrupts except TU.
+	 *
+	 * Note the NIE and AIE bits shall also be set in order to actually
+	 * enable the selected interrupts.
+	 */
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR7,
+			   OWL_EMAC_BIT_MAC_CSR7_NIE |
+			   OWL_EMAC_BIT_MAC_CSR7_AIE |
+			   OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE);
+}
+
+static void owl_emac_irq_disable(struct owl_emac_priv *priv)
+{
+	/* Disable all interrupts.
+	 *
+	 * WARNING: Unset only the NIE and AIE bits in CSR7 to workaround an
+	 * unexpected side effect (MAC hardware bug?!) where some bits in the
+	 * status register (CSR5) are cleared automatically before being able
+	 * to read them via owl_emac_irq_clear().
+	 */
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR7,
+			   OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE);
+}
+
+static u32 owl_emac_irq_status(struct owl_emac_priv *priv)
+{
+	return owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR5);
+}
+
+static u32 owl_emac_irq_clear(struct owl_emac_priv *priv)
+{
+	u32 val = owl_emac_irq_status(priv);
+
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR5, val);
+
+	return val;
+}
+
+static dma_addr_t owl_emac_dma_map_rx(struct owl_emac_priv *priv,
+				      struct sk_buff *skb)
+{
+	struct device *dev = owl_emac_get_dev(priv);
+
+	/* Buffer pointer for the RX DMA descriptor must be word aligned. */
+	return dma_map_single(dev, skb_tail_pointer(skb),
+			      skb_tailroom(skb), DMA_FROM_DEVICE);
+}
+
+static void owl_emac_dma_unmap_rx(struct owl_emac_priv *priv,
+				  struct sk_buff *skb, dma_addr_t dma_addr)
+{
+	struct device *dev = owl_emac_get_dev(priv);
+
+	dma_unmap_single(dev, dma_addr, skb_tailroom(skb), DMA_FROM_DEVICE);
+}
+
+static dma_addr_t owl_emac_dma_map_tx(struct owl_emac_priv *priv,
+				      struct sk_buff *skb)
+{
+	struct device *dev = owl_emac_get_dev(priv);
+
+	return dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
+}
+
+static void owl_emac_dma_unmap_tx(struct owl_emac_priv *priv,
+				  struct sk_buff *skb, dma_addr_t dma_addr)
+{
+	struct device *dev = owl_emac_get_dev(priv);
+
+	dma_unmap_single(dev, dma_addr, skb_headlen(skb), DMA_TO_DEVICE);
+}
+
+static unsigned int owl_emac_ring_num_unused(struct owl_emac_ring *ring)
+{
+	return CIRC_SPACE(ring->head, ring->tail, ring->size);
+}
+
+static unsigned int owl_emac_ring_get_next(struct owl_emac_ring *ring,
+					   unsigned int cur)
+{
+	return (cur + 1) & (ring->size - 1);
+}
+
+static void owl_emac_ring_push_head(struct owl_emac_ring *ring)
+{
+	ring->head = owl_emac_ring_get_next(ring, ring->head);
+}
+
+static void owl_emac_ring_pop_tail(struct owl_emac_ring *ring)
+{
+	ring->tail = owl_emac_ring_get_next(ring, ring->tail);
+}
+
+static struct sk_buff *owl_emac_alloc_skb(struct net_device *netdev)
+{
+	struct sk_buff *skb;
+	int offset;
+
+	skb = netdev_alloc_skb(netdev, OWL_EMAC_RX_FRAME_MAX_LEN +
+			       OWL_EMAC_SKB_RESERVE);
+	if (unlikely(!skb))
+		return NULL;
+
+	/* Ensure 4 bytes DMA alignment. */
+	offset = ((uintptr_t)skb->data) & (OWL_EMAC_SKB_ALIGN - 1);
+	if (unlikely(offset))
+		skb_reserve(skb, OWL_EMAC_SKB_ALIGN - offset);
+
+	return skb;
+}
+
+static int owl_emac_ring_prepare_rx(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->rx_ring;
+	struct device *dev = owl_emac_get_dev(priv);
+	struct net_device *netdev = priv->netdev;
+	struct owl_emac_ring_desc *desc;
+	struct sk_buff *skb;
+	dma_addr_t dma_addr;
+	int i;
+
+	for (i = 0; i < ring->size; i++) {
+		skb = owl_emac_alloc_skb(netdev);
+		if (!skb)
+			return -ENOMEM;
+
+		dma_addr = owl_emac_dma_map_rx(priv, skb);
+		if (dma_mapping_error(dev, dma_addr)) {
+			dev_kfree_skb(skb);
+			return -ENOMEM;
+		}
+
+		desc = &ring->descs[i];
+		desc->status = OWL_EMAC_BIT_RDES0_OWN;
+		desc->control = skb_tailroom(skb) & OWL_EMAC_MSK_RDES1_RBS1;
+		desc->buf_addr = dma_addr;
+		desc->reserved = 0;
+
+		ring->skbs[i] = skb;
+		ring->skbs_dma[i] = dma_addr;
+	}
+
+	desc->control |= OWL_EMAC_BIT_RDES1_RER;
+
+	ring->head = 0;
+	ring->tail = 0;
+
+	return 0;
+}
+
+static void owl_emac_ring_prepare_tx(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->tx_ring;
+	struct owl_emac_ring_desc *desc;
+	int i;
+
+	for (i = 0; i < ring->size; i++) {
+		desc = &ring->descs[i];
+
+		desc->status = 0;
+		desc->control = OWL_EMAC_BIT_TDES1_IC;
+		desc->buf_addr = 0;
+		desc->reserved = 0;
+	}
+
+	desc->control |= OWL_EMAC_BIT_TDES1_TER;
+
+	memset(ring->skbs_dma, 0, sizeof(dma_addr_t) * ring->size);
+
+	ring->head = 0;
+	ring->tail = 0;
+}
+
+static void owl_emac_ring_unprepare_rx(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->rx_ring;
+	int i;
+
+	for (i = 0; i < ring->size; i++) {
+		ring->descs[i].status = 0;
+
+		if (!ring->skbs_dma[i])
+			continue;
+
+		owl_emac_dma_unmap_rx(priv, ring->skbs[i], ring->skbs_dma[i]);
+		ring->skbs_dma[i] = 0;
+
+		dev_kfree_skb(ring->skbs[i]);
+		ring->skbs[i] = NULL;
+	}
+}
+
+static void owl_emac_ring_unprepare_tx(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->tx_ring;
+	int i;
+
+	for (i = 0; i < ring->size; i++) {
+		ring->descs[i].status = 0;
+
+		if (!ring->skbs_dma[i])
+			continue;
+
+		owl_emac_dma_unmap_tx(priv, ring->skbs[i], ring->skbs_dma[i]);
+		ring->skbs_dma[i] = 0;
+
+		dev_kfree_skb(ring->skbs[i]);
+		ring->skbs[i] = NULL;
+	}
+}
+
+static int owl_emac_ring_alloc(struct device *dev, struct owl_emac_ring *ring,
+			       unsigned int size)
+{
+	ring->descs = dmam_alloc_coherent(dev,
+					  sizeof(struct owl_emac_ring_desc) * size,
+					  &ring->descs_dma, GFP_KERNEL);
+	if (!ring->descs)
+		return -ENOMEM;
+
+	ring->skbs = devm_kcalloc(dev, size, sizeof(struct sk_buff *),
+				  GFP_KERNEL);
+	if (!ring->skbs)
+		return -ENOMEM;
+
+	ring->skbs_dma = devm_kcalloc(dev, size, sizeof(dma_addr_t),
+				      GFP_KERNEL);
+	if (!ring->skbs_dma)
+		return -ENOMEM;
+
+	ring->size = size;
+
+	return 0;
+}
+
+static void owl_emac_dma_cmd_resume_rx(struct owl_emac_priv *priv)
+{
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR2,
+			   OWL_EMAC_VAL_MAC_CSR2_RPD);
+}
+
+static void owl_emac_dma_cmd_resume_tx(struct owl_emac_priv *priv)
+{
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR1,
+			   OWL_EMAC_VAL_MAC_CSR1_TPD);
+}
+
+static u32 owl_emac_dma_cmd_set_tx(struct owl_emac_priv *priv, u32 status)
+{
+	return owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6,
+				   OWL_EMAC_BIT_MAC_CSR6_ST, status);
+}
+
+static u32 owl_emac_dma_cmd_start_tx(struct owl_emac_priv *priv)
+{
+	return owl_emac_dma_cmd_set_tx(priv, ~0);
+}
+
+static u32 owl_emac_dma_cmd_set(struct owl_emac_priv *priv, u32 status)
+{
+	return owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6,
+				   OWL_EMAC_MSK_MAC_CSR6_STSR, status);
+}
+
+static u32 owl_emac_dma_cmd_start(struct owl_emac_priv *priv)
+{
+	return owl_emac_dma_cmd_set(priv, ~0);
+}
+
+static u32 owl_emac_dma_cmd_stop(struct owl_emac_priv *priv)
+{
+	return owl_emac_dma_cmd_set(priv, 0);
+}
+
+static void owl_emac_set_hw_mac_addr(struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	const u8 *mac_addr = netdev->dev_addr;
+	u32 addr_high, addr_low;
+
+	addr_high = mac_addr[0] << 8 | mac_addr[1];
+	addr_low = mac_addr[2] << 24 | mac_addr[3] << 16 |
+		   mac_addr[4] << 8 | mac_addr[5];
+
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR17, addr_high);
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR16, addr_low);
+}
+
+static void owl_emac_update_link_state(struct owl_emac_priv *priv)
+{
+	u32 val, status;
+
+	if (priv->pause) {
+		val = OWL_EMAC_BIT_MAC_CSR20_FCE | OWL_EMAC_BIT_MAC_CSR20_TUE;
+		val |= OWL_EMAC_BIT_MAC_CSR20_TPE | OWL_EMAC_BIT_MAC_CSR20_RPE;
+		val |= OWL_EMAC_BIT_MAC_CSR20_BPE;
+	} else {
+		val = 0;
+	}
+
+	/* Update flow control. */
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR20, val);
+
+	val = (priv->speed == SPEED_100) ? OWL_EMAC_VAL_MAC_CSR6_SPEED_100M :
+					   OWL_EMAC_VAL_MAC_CSR6_SPEED_10M;
+	val <<= OWL_EMAC_OFF_MAC_CSR6_SPEED;
+
+	if (priv->duplex == DUPLEX_FULL)
+		val |= OWL_EMAC_BIT_MAC_CSR6_FD;
+
+	spin_lock_bh(&priv->lock);
+
+	/* Temporarily stop DMA TX & RX. */
+	status = owl_emac_dma_cmd_stop(priv);
+
+	/* Update operation modes. */
+	owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6,
+			    OWL_EMAC_MSK_MAC_CSR6_SPEED |
+			    OWL_EMAC_BIT_MAC_CSR6_FD, val);
+
+	/* Restore DMA TX & RX status. */
+	owl_emac_dma_cmd_set(priv, status);
+
+	spin_unlock_bh(&priv->lock);
+}
+
+static void owl_emac_adjust_link(struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	struct phy_device *phydev = netdev->phydev;
+	bool state_changed = false;
+
+	if (phydev->link) {
+		if (!priv->link) {
+			priv->link = phydev->link;
+			state_changed = true;
+		}
+
+		if (priv->speed != phydev->speed) {
+			priv->speed = phydev->speed;
+			state_changed = true;
+		}
+
+		if (priv->duplex != phydev->duplex) {
+			priv->duplex = phydev->duplex;
+			state_changed = true;
+		}
+
+		if (priv->pause != phydev->pause) {
+			priv->pause = phydev->pause;
+			state_changed = true;
+		}
+	} else {
+		if (priv->link) {
+			priv->link = phydev->link;
+			state_changed = true;
+		}
+	}
+
+	if (state_changed) {
+		if (phydev->link)
+			owl_emac_update_link_state(priv);
+
+		if (netif_msg_link(priv))
+			phy_print_status(phydev);
+	}
+}
+
+static irqreturn_t owl_emac_handle_irq(int irq, void *data)
+{
+	struct net_device *netdev = data;
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+
+	if (netif_running(netdev)) {
+		owl_emac_irq_disable(priv);
+		napi_schedule(&priv->napi);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void owl_emac_ether_addr_push(u8 **dst, const u8 *src)
+{
+	u32 *a = (u32 *)(*dst);
+	const u16 *b = (const u16 *)src;
+
+	a[0] = b[0];
+	a[1] = b[1];
+	a[2] = b[2];
+
+	*dst += 12;
+}
+
+static void
+owl_emac_setup_frame_prepare(struct owl_emac_priv *priv, struct sk_buff *skb)
+{
+	const u8 bcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+	const u8 *mac_addr = priv->netdev->dev_addr;
+	u8 *frame;
+	int i;
+
+	skb_put(skb, OWL_EMAC_SETUP_FRAME_LEN);
+
+	frame = skb->data;
+	memset(frame, 0, skb->len);
+
+	owl_emac_ether_addr_push(&frame, mac_addr);
+	owl_emac_ether_addr_push(&frame, bcast_addr);
+
+	/* Fill multicast addresses. */
+	WARN_ON(priv->mcaddr_list.count >= OWL_EMAC_MAX_MULTICAST_ADDRS);
+	for (i = 0; i < priv->mcaddr_list.count; i++) {
+		mac_addr = priv->mcaddr_list.addrs[i];
+		owl_emac_ether_addr_push(&frame, mac_addr);
+	}
+}
+
+/* The setup frame is a special descriptor which is used to provide physical
+ * addresses (i.e. mac, broadcast and multicast) to the MAC hardware for
+ * filtering purposes. To be recognized as a setup frame, the TDES1_SET bit
+ * must be set in the TX descriptor control field.
+ */
+static int owl_emac_setup_frame_xmit(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->tx_ring;
+	struct net_device *netdev = priv->netdev;
+	struct owl_emac_ring_desc *desc;
+	struct sk_buff *skb;
+	unsigned int tx_head;
+	u32 status, control;
+	dma_addr_t dma_addr;
+	int ret;
+
+	skb = owl_emac_alloc_skb(netdev);
+	if (!skb)
+		return -ENOMEM;
+
+	owl_emac_setup_frame_prepare(priv, skb);
+
+	dma_addr = owl_emac_dma_map_tx(priv, skb);
+	if (dma_mapping_error(owl_emac_get_dev(priv), dma_addr)) {
+		ret = -ENOMEM;
+		goto err_free_skb;
+	}
+
+	spin_lock_bh(&priv->lock);
+
+	tx_head = ring->head;
+	desc = &ring->descs[tx_head];
+
+	status = READ_ONCE(desc->status);
+	control = READ_ONCE(desc->control);
+	dma_rmb(); /* Ensure data has been read before used. */
+
+	if (unlikely(status & OWL_EMAC_BIT_TDES0_OWN) ||
+	    !owl_emac_ring_num_unused(ring)) {
+		spin_unlock_bh(&priv->lock);
+		owl_emac_dma_unmap_tx(priv, skb, dma_addr);
+		ret = -EBUSY;
+		goto err_free_skb;
+	}
+
+	ring->skbs[tx_head] = skb;
+	ring->skbs_dma[tx_head] = dma_addr;
+
+	control &= OWL_EMAC_BIT_TDES1_IC | OWL_EMAC_BIT_TDES1_TER; /* Maintain bits */
+	control |= OWL_EMAC_BIT_TDES1_SET;
+	control |= OWL_EMAC_MSK_TDES1_TBS1 & skb->len;
+
+	WRITE_ONCE(desc->control, control);
+	WRITE_ONCE(desc->buf_addr, dma_addr);
+	dma_wmb(); /* Flush descriptor before changing ownership. */
+	WRITE_ONCE(desc->status, OWL_EMAC_BIT_TDES0_OWN);
+
+	owl_emac_ring_push_head(ring);
+
+	/* Temporarily enable DMA TX. */
+	status = owl_emac_dma_cmd_start_tx(priv);
+
+	/* Trigger setup frame processing. */
+	owl_emac_dma_cmd_resume_tx(priv);
+
+	/* Restore DMA TX status. */
+	owl_emac_dma_cmd_set_tx(priv, status);
+
+	/* Stop regular TX until setup frame is processed. */
+	netif_stop_queue(netdev);
+
+	spin_unlock_bh(&priv->lock);
+
+	return 0;
+
+err_free_skb:
+	dev_kfree_skb(skb);
+	return ret;
+}
+
+static netdev_tx_t owl_emac_ndo_start_xmit(struct sk_buff *skb,
+					   struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	struct device *dev = owl_emac_get_dev(priv);
+	struct owl_emac_ring *ring = &priv->tx_ring;
+	struct owl_emac_ring_desc *desc;
+	unsigned int tx_head;
+	u32 status, control;
+	dma_addr_t dma_addr;
+
+	dma_addr = owl_emac_dma_map_tx(priv, skb);
+	if (dma_mapping_error(dev, dma_addr)) {
+		dev_err_ratelimited(&netdev->dev, "TX DMA mapping failed\n");
+		dev_kfree_skb(skb);
+		netdev->stats.tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	spin_lock_bh(&priv->lock);
+
+	tx_head = ring->head;
+	desc = &ring->descs[tx_head];
+
+	status = READ_ONCE(desc->status);
+	control = READ_ONCE(desc->control);
+	dma_rmb(); /* Ensure data has been read before used. */
+
+	if (!owl_emac_ring_num_unused(ring) ||
+	    unlikely(status & OWL_EMAC_BIT_TDES0_OWN)) {
+		netif_stop_queue(netdev);
+		spin_unlock_bh(&priv->lock);
+
+		dev_dbg_ratelimited(&netdev->dev, "TX buffer full, status=0x%08x\n",
+				    owl_emac_irq_status(priv));
+		owl_emac_dma_unmap_tx(priv, skb, dma_addr);
+		netdev->stats.tx_dropped++;
+		return NETDEV_TX_BUSY;
+	}
+
+	ring->skbs[tx_head] = skb;
+	ring->skbs_dma[tx_head] = dma_addr;
+
+	control &= OWL_EMAC_BIT_TDES1_IC | OWL_EMAC_BIT_TDES1_TER; /* Maintain bits */
+	control |= OWL_EMAC_BIT_TDES1_FS | OWL_EMAC_BIT_TDES1_LS;
+	control |= OWL_EMAC_MSK_TDES1_TBS1 & skb->len;
+
+	WRITE_ONCE(desc->control, control);
+	WRITE_ONCE(desc->buf_addr, dma_addr);
+	dma_wmb(); /* Flush descriptor before changing ownership. */
+	WRITE_ONCE(desc->status, OWL_EMAC_BIT_TDES0_OWN);
+
+	owl_emac_dma_cmd_resume_tx(priv);
+	owl_emac_ring_push_head(ring);
+
+	/* FIXME: The transmission is currently restricted to a single frame
+	 * at a time as a workaround for a MAC hardware bug that causes random
+	 * freeze of the TX queue processor.
+	 */
+	netif_stop_queue(netdev);
+
+	spin_unlock_bh(&priv->lock);
+
+	return NETDEV_TX_OK;
+}
+
+static bool owl_emac_tx_complete_tail(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->tx_ring;
+	struct net_device *netdev = priv->netdev;
+	struct owl_emac_ring_desc *desc;
+	struct sk_buff *skb;
+	unsigned int tx_tail;
+	u32 status;
+
+	tx_tail = ring->tail;
+	desc = &ring->descs[tx_tail];
+
+	status = READ_ONCE(desc->status);
+	dma_rmb(); /* Ensure data has been read before used. */
+
+	if (status & OWL_EMAC_BIT_TDES0_OWN)
+		return false;
+
+	/* Check for errors. */
+	if (status & OWL_EMAC_BIT_TDES0_ES) {
+		dev_dbg_ratelimited(&netdev->dev,
+				    "TX complete error status: 0x%08x\n",
+				    status);
+
+		netdev->stats.tx_errors++;
+
+		if (status & OWL_EMAC_BIT_TDES0_UF)
+			netdev->stats.tx_fifo_errors++;
+
+		if (status & OWL_EMAC_BIT_TDES0_EC)
+			netdev->stats.tx_aborted_errors++;
+
+		if (status & OWL_EMAC_BIT_TDES0_LC)
+			netdev->stats.tx_window_errors++;
+
+		if (status & OWL_EMAC_BIT_TDES0_NC)
+			netdev->stats.tx_heartbeat_errors++;
+
+		if (status & OWL_EMAC_BIT_TDES0_LO)
+			netdev->stats.tx_carrier_errors++;
+	} else {
+		netdev->stats.tx_packets++;
+		netdev->stats.tx_bytes += ring->skbs[tx_tail]->len;
+	}
+
+	/* Some collisions occurred, but pkt has been transmitted. */
+	if (status & OWL_EMAC_BIT_TDES0_DE)
+		netdev->stats.collisions++;
+
+	skb = ring->skbs[tx_tail];
+	owl_emac_dma_unmap_tx(priv, skb, ring->skbs_dma[tx_tail]);
+	dev_kfree_skb(skb);
+
+	ring->skbs[tx_tail] = NULL;
+	ring->skbs_dma[tx_tail] = 0;
+
+	owl_emac_ring_pop_tail(ring);
+
+	if (unlikely(netif_queue_stopped(netdev)))
+		netif_wake_queue(netdev);
+
+	return true;
+}
+
+static void owl_emac_tx_complete(struct owl_emac_priv *priv)
+{
+	struct owl_emac_ring *ring = &priv->tx_ring;
+	struct net_device *netdev = priv->netdev;
+	unsigned int tx_next;
+	u32 status;
+
+	spin_lock(&priv->lock);
+
+	while (ring->tail != ring->head) {
+		if (!owl_emac_tx_complete_tail(priv))
+			break;
+	}
+
+	/* FIXME: This is a workaround for a MAC hardware bug not clearing
+	 * (sometimes) the OWN bit for a transmitted frame descriptor.
+	 *
+	 * At this point, when TX queue is full, the tail descriptor has the
+	 * OWN bit set, which normally means the frame has not been processed
+	 * or transmitted yet. But if there is at least one descriptor in the
+	 * queue having the OWN bit cleared, we can safely assume the tail
+	 * frame has been also processed by the MAC hardware.
+	 *
+	 * If that's the case, let's force the frame completion by manually
+	 * clearing the OWN bit.
+	 */
+	if (unlikely(!owl_emac_ring_num_unused(ring))) {
+		tx_next = ring->tail;
+
+		while ((tx_next = owl_emac_ring_get_next(ring, tx_next)) != ring->head) {
+			status = READ_ONCE(ring->descs[tx_next].status);
+			dma_rmb(); /* Ensure data has been read before used. */
+
+			if (status & OWL_EMAC_BIT_TDES0_OWN)
+				continue;
+
+			netdev_dbg(netdev, "Found uncleared TX desc OWN bit\n");
+
+			status = READ_ONCE(ring->descs[ring->tail].status);
+			dma_rmb(); /* Ensure data has been read before used. */
+			status &= ~OWL_EMAC_BIT_TDES0_OWN;
+			WRITE_ONCE(ring->descs[ring->tail].status, status);
+
+			owl_emac_tx_complete_tail(priv);
+			break;
+		}
+	}
+
+	spin_unlock(&priv->lock);
+}
+
+static int owl_emac_rx_process(struct owl_emac_priv *priv, int budget)
+{
+	struct owl_emac_ring *ring = &priv->rx_ring;
+	struct device *dev = owl_emac_get_dev(priv);
+	struct net_device *netdev = priv->netdev;
+	struct owl_emac_ring_desc *desc;
+	struct sk_buff *curr_skb, *new_skb;
+	dma_addr_t curr_dma, new_dma;
+	unsigned int rx_tail, len;
+	u32 status;
+	int recv = 0;
+
+	while (recv < budget) {
+		spin_lock(&priv->lock);
+
+		rx_tail = ring->tail;
+		desc = &ring->descs[rx_tail];
+
+		status = READ_ONCE(desc->status);
+		dma_rmb(); /* Ensure data has been read before used. */
+
+		if (status & OWL_EMAC_BIT_RDES0_OWN) {
+			spin_unlock(&priv->lock);
+			break;
+		}
+
+		curr_skb = ring->skbs[rx_tail];
+		curr_dma = ring->skbs_dma[rx_tail];
+		owl_emac_ring_pop_tail(ring);
+
+		spin_unlock(&priv->lock);
+
+		if (status & (OWL_EMAC_BIT_RDES0_DE | OWL_EMAC_BIT_RDES0_RF |
+		    OWL_EMAC_BIT_RDES0_TL | OWL_EMAC_BIT_RDES0_CS |
+		    OWL_EMAC_BIT_RDES0_DB | OWL_EMAC_BIT_RDES0_CE |
+		    OWL_EMAC_BIT_RDES0_ZERO)) {
+			dev_dbg_ratelimited(&netdev->dev,
+					    "RX desc error status: 0x%08x\n",
+					    status);
+
+			if (status & OWL_EMAC_BIT_RDES0_DE)
+				netdev->stats.rx_over_errors++;
+
+			if (status & (OWL_EMAC_BIT_RDES0_RF | OWL_EMAC_BIT_RDES0_DB))
+				netdev->stats.rx_frame_errors++;
+
+			if (status & OWL_EMAC_BIT_RDES0_TL)
+				netdev->stats.rx_length_errors++;
+
+			if (status & OWL_EMAC_BIT_RDES0_CS)
+				netdev->stats.collisions++;
+
+			if (status & OWL_EMAC_BIT_RDES0_CE)
+				netdev->stats.rx_crc_errors++;
+
+			if (status & OWL_EMAC_BIT_RDES0_ZERO)
+				netdev->stats.rx_fifo_errors++;
+
+			goto drop_skb;
+		}
+
+		len = (status & OWL_EMAC_MSK_RDES0_FL) >> OWL_EMAC_OFF_RDES0_FL;
+		if (unlikely(len > OWL_EMAC_RX_FRAME_MAX_LEN)) {
+			netdev->stats.rx_length_errors++;
+			netdev_err(netdev, "invalid RX frame len: %u\n", len);
+			goto drop_skb;
+		}
+
+		/* Prepare new skb before receiving the current one. */
+		new_skb = owl_emac_alloc_skb(netdev);
+		if (unlikely(!new_skb))
+			goto drop_skb;
+
+		new_dma = owl_emac_dma_map_rx(priv, new_skb);
+		if (dma_mapping_error(dev, new_dma)) {
+			dev_kfree_skb(new_skb);
+			netdev_err(netdev, "RX DMA mapping failed\n");
+			goto drop_skb;
+		}
+
+		owl_emac_dma_unmap_rx(priv, curr_skb, curr_dma);
+
+		skb_put(curr_skb, len - ETH_FCS_LEN);
+		curr_skb->ip_summed = CHECKSUM_NONE;
+		curr_skb->protocol = eth_type_trans(curr_skb, netdev);
+		curr_skb->dev = netdev;
+
+		netif_receive_skb(curr_skb);
+
+		netdev->stats.rx_packets++;
+		netdev->stats.rx_bytes += len;
+		recv++;
+		goto push_skb;
+
+drop_skb:
+		netdev->stats.rx_dropped++;
+		netdev->stats.rx_errors++;
+		/* Reuse the current skb. */
+		new_skb = curr_skb;
+		new_dma = curr_dma;
+
+push_skb:
+		spin_lock(&priv->lock);
+
+		ring->skbs[ring->head] = new_skb;
+		ring->skbs_dma[ring->head] = new_dma;
+
+		WRITE_ONCE(desc->buf_addr, new_dma);
+		dma_wmb(); /* Flush descriptor before changing ownership. */
+		WRITE_ONCE(desc->status, OWL_EMAC_BIT_RDES0_OWN);
+
+		owl_emac_ring_push_head(ring);
+
+		spin_unlock(&priv->lock);
+	}
+
+	return recv;
+}
+
+static int owl_emac_poll(struct napi_struct *napi, int budget)
+{
+	int work_done = 0, ru_cnt = 0, recv;
+	static int tx_err_cnt, rx_err_cnt;
+	struct owl_emac_priv *priv;
+	u32 status, proc_status;
+
+	priv = container_of(napi, struct owl_emac_priv, napi);
+
+	while ((status = owl_emac_irq_clear(priv)) &
+	       (OWL_EMAC_BIT_MAC_CSR5_NIS | OWL_EMAC_BIT_MAC_CSR5_AIS)) {
+		recv = 0;
+
+		/* TX setup frame raises ETI instead of TI. */
+		if (status & (OWL_EMAC_BIT_MAC_CSR5_TI | OWL_EMAC_BIT_MAC_CSR5_ETI)) {
+			owl_emac_tx_complete(priv);
+			tx_err_cnt = 0;
+
+			/* Count MAC internal RX errors. */
+			proc_status = status & OWL_EMAC_MSK_MAC_CSR5_RS;
+			proc_status >>= OWL_EMAC_OFF_MAC_CSR5_RS;
+			if (proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_DATA ||
+			    proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_CDES ||
+			    proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_FDES)
+				rx_err_cnt++;
+		}
+
+		if (status & OWL_EMAC_BIT_MAC_CSR5_RI) {
+			recv = owl_emac_rx_process(priv, budget - work_done);
+			rx_err_cnt = 0;
+
+			/* Count MAC internal TX errors. */
+			proc_status = status & OWL_EMAC_MSK_MAC_CSR5_TS;
+			proc_status >>= OWL_EMAC_OFF_MAC_CSR5_TS;
+			if (proc_status == OWL_EMAC_VAL_MAC_CSR5_TS_DATA ||
+			    proc_status == OWL_EMAC_VAL_MAC_CSR5_TS_CDES)
+				tx_err_cnt++;
+		} else if (status & OWL_EMAC_BIT_MAC_CSR5_RU) {
+			/* MAC AHB is in suspended state, will return to RX
+			 * descriptor processing when the host changes ownership
+			 * of the descriptor and either an RX poll demand CMD is
+			 * issued or a new frame is recognized by the MAC AHB.
+			 */
+			if (++ru_cnt == 2)
+				owl_emac_dma_cmd_resume_rx(priv);
+
+			recv = owl_emac_rx_process(priv, budget - work_done);
+
+			/* Guard against too many RU interrupts. */
+			if (ru_cnt > 3)
+				break;
+		}
+
+		work_done += recv;
+		if (work_done >= budget)
+			break;
+	}
+
+	if (work_done < budget) {
+		napi_complete_done(napi, work_done);
+		owl_emac_irq_enable(priv);
+	}
+
+	/* Reset MAC when getting too many internal TX or RX errors. */
+	if (tx_err_cnt > 10 || rx_err_cnt > 10) {
+		netdev_dbg(priv->netdev, "%s error status: 0x%08x\n",
+			   tx_err_cnt > 10 ? "TX" : "RX", status);
+		rx_err_cnt = 0;
+		tx_err_cnt = 0;
+		schedule_work(&priv->mac_reset_task);
+	}
+
+	return work_done;
+}
+
+static void owl_emac_mdio_clock_enable(struct owl_emac_priv *priv)
+{
+	u32 val;
+
+	/* Enable MDC clock generation by adjusting CLKDIV according to
+	 * the vendor implementation of the original driver.
+	 */
+	val = owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR10);
+	val &= OWL_EMAC_MSK_MAC_CSR10_CLKDIV;
+	val |= OWL_EMAC_VAL_MAC_CSR10_CLKDIV_128 << OWL_EMAC_OFF_MAC_CSR10_CLKDIV;
+
+	val |= OWL_EMAC_BIT_MAC_CSR10_SB;
+	val |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_CDS << OWL_EMAC_OFF_MAC_CSR10_OPCODE;
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, val);
+}
+
+static void owl_emac_core_hw_reset(struct owl_emac_priv *priv)
+{
+	/* Trigger hardware reset. */
+	reset_control_assert(priv->reset);
+	usleep_range(10, 20);
+	reset_control_deassert(priv->reset);
+	usleep_range(100, 200);
+}
+
+static int owl_emac_core_sw_reset(struct owl_emac_priv *priv)
+{
+	u32 val;
+	int ret;
+
+	/* Trigger software reset. */
+	owl_emac_reg_set(priv, OWL_EMAC_REG_MAC_CSR0, OWL_EMAC_BIT_MAC_CSR0_SWR);
+	ret = readl_poll_timeout(priv->base + OWL_EMAC_REG_MAC_CSR0,
+				 val, !(val & OWL_EMAC_BIT_MAC_CSR0_SWR),
+				 OWL_EMAC_POLL_DELAY_USEC,
+				 OWL_EMAC_RESET_POLL_TIMEOUT_USEC);
+	if (ret)
+		return ret;
+
+	if (priv->phy_mode == PHY_INTERFACE_MODE_RMII) {
+		/* Enable RMII and use the 50MHz rmii clk as output to PHY. */
+		val = 0;
+	} else {
+		/* Enable SMII and use the 125MHz rmii clk as output to PHY.
+		 * Additionally set SMII SYNC delay to 4 half cycle.
+		 */
+		val = 0x04 << OWL_EMAC_OFF_MAC_CTRL_SSDC;
+		val |= OWL_EMAC_BIT_MAC_CTRL_RSIS;
+	}
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CTRL, val);
+
+	/* MDC is disabled after reset. */
+	owl_emac_mdio_clock_enable(priv);
+
+	/* Set FIFO pause & restart threshold levels. */
+	val = 0x40 << OWL_EMAC_OFF_MAC_CSR19_FPTL;
+	val |= 0x10 << OWL_EMAC_OFF_MAC_CSR19_FRTL;
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR19, val);
+
+	/* Set flow control pause quanta time to ~100 ms. */
+	val = 0x4FFF << OWL_EMAC_OFF_MAC_CSR18_PQT;
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR18, val);
+
+	/* Setup interrupt mitigation. */
+	val = 7 << OWL_EMAC_OFF_MAC_CSR11_NRP;
+	val |= 4 << OWL_EMAC_OFF_MAC_CSR11_RT;
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR11, val);
+
+	/* Set RX/TX rings base addresses. */
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR3,
+			   (u32)(priv->rx_ring.descs_dma));
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR4,
+			   (u32)(priv->tx_ring.descs_dma));
+
+	/* Setup initial operation mode. */
+	val = OWL_EMAC_VAL_MAC_CSR6_SPEED_100M << OWL_EMAC_OFF_MAC_CSR6_SPEED;
+	val |= OWL_EMAC_BIT_MAC_CSR6_FD;
+	owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6,
+			    OWL_EMAC_MSK_MAC_CSR6_SPEED |
+			    OWL_EMAC_BIT_MAC_CSR6_FD, val);
+	owl_emac_reg_clear(priv, OWL_EMAC_REG_MAC_CSR6,
+			   OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM);
+
+	priv->link = 0;
+	priv->speed = SPEED_UNKNOWN;
+	priv->duplex = DUPLEX_UNKNOWN;
+	priv->pause = 0;
+	priv->mcaddr_list.count = 0;
+
+	return 0;
+}
+
+static int owl_emac_enable(struct net_device *netdev, bool start_phy)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	int ret;
+
+	owl_emac_dma_cmd_stop(priv);
+	owl_emac_irq_disable(priv);
+	owl_emac_irq_clear(priv);
+
+	owl_emac_ring_prepare_tx(priv);
+	ret = owl_emac_ring_prepare_rx(priv);
+	if (ret)
+		goto err_unprep;
+
+	ret = owl_emac_core_sw_reset(priv);
+	if (ret) {
+		netdev_err(netdev, "failed to soft reset MAC core: %d\n", ret);
+		goto err_unprep;
+	}
+
+	owl_emac_set_hw_mac_addr(netdev);
+	owl_emac_setup_frame_xmit(priv);
+
+	netdev_reset_queue(netdev);
+	napi_enable(&priv->napi);
+
+	owl_emac_irq_enable(priv);
+	owl_emac_dma_cmd_start(priv);
+
+	if (start_phy)
+		phy_start(netdev->phydev);
+
+	netif_start_queue(netdev);
+
+	return 0;
+
+err_unprep:
+	owl_emac_ring_unprepare_rx(priv);
+	owl_emac_ring_unprepare_tx(priv);
+
+	return ret;
+}
+
+static void owl_emac_disable(struct net_device *netdev, bool stop_phy)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+
+	owl_emac_dma_cmd_stop(priv);
+	owl_emac_irq_disable(priv);
+
+	netif_stop_queue(netdev);
+	napi_disable(&priv->napi);
+
+	if (stop_phy)
+		phy_stop(netdev->phydev);
+
+	owl_emac_ring_unprepare_rx(priv);
+	owl_emac_ring_unprepare_tx(priv);
+}
+
+static int owl_emac_ndo_open(struct net_device *netdev)
+{
+	return owl_emac_enable(netdev, true);
+}
+
+static int owl_emac_ndo_stop(struct net_device *netdev)
+{
+	owl_emac_disable(netdev, true);
+
+	return 0;
+}
+
+static void owl_emac_set_multicast(struct net_device *netdev, int count)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	struct netdev_hw_addr *ha;
+	int index = 0;
+
+	if (count <= 0) {
+		priv->mcaddr_list.count = 0;
+		return;
+	}
+
+	netdev_for_each_mc_addr(ha, netdev) {
+		if (!is_multicast_ether_addr(ha->addr))
+			continue;
+
+		WARN_ON(index >= OWL_EMAC_MAX_MULTICAST_ADDRS);
+		ether_addr_copy(priv->mcaddr_list.addrs[index++], ha->addr);
+	}
+
+	priv->mcaddr_list.count = index;
+
+	owl_emac_setup_frame_xmit(priv);
+}
+
+static void owl_emac_ndo_set_rx_mode(struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	u32 status, val = 0;
+	int mcast_count = 0;
+
+	if (netdev->flags & IFF_PROMISC) {
+		val = OWL_EMAC_BIT_MAC_CSR6_PR;
+	} else if (netdev->flags & IFF_ALLMULTI) {
+		val = OWL_EMAC_BIT_MAC_CSR6_PM;
+	} else if (netdev->flags & IFF_MULTICAST) {
+		mcast_count = netdev_mc_count(netdev);
+
+		if (mcast_count > OWL_EMAC_MAX_MULTICAST_ADDRS) {
+			val = OWL_EMAC_BIT_MAC_CSR6_PM;
+			mcast_count = 0;
+		}
+	}
+
+	spin_lock_bh(&priv->lock);
+
+	/* Temporarily stop DMA TX & RX. */
+	status = owl_emac_dma_cmd_stop(priv);
+
+	/* Update operation modes. */
+	owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6,
+			    OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM,
+			    val);
+
+	/* Restore DMA TX & RX status. */
+	owl_emac_dma_cmd_set(priv, status);
+
+	spin_unlock_bh(&priv->lock);
+
+	/* Set/reset multicast addr list. */
+	owl_emac_set_multicast(netdev, mcast_count);
+}
+
+static int owl_emac_ndo_set_mac_addr(struct net_device *netdev, void *addr)
+{
+	struct sockaddr *skaddr = addr;
+
+	if (!is_valid_ether_addr(skaddr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	if (netif_running(netdev))
+		return -EBUSY;
+
+	eth_hw_addr_set(netdev, skaddr->sa_data);
+	owl_emac_set_hw_mac_addr(netdev);
+
+	return owl_emac_setup_frame_xmit(netdev_priv(netdev));
+}
+
+static int owl_emac_ndo_eth_ioctl(struct net_device *netdev,
+				  struct ifreq *req, int cmd)
+{
+	if (!netif_running(netdev))
+		return -EINVAL;
+
+	return phy_mii_ioctl(netdev->phydev, req, cmd);
+}
+
+static void owl_emac_ndo_tx_timeout(struct net_device *netdev,
+				    unsigned int txqueue)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+
+	schedule_work(&priv->mac_reset_task);
+}
+
+static void owl_emac_reset_task(struct work_struct *work)
+{
+	struct owl_emac_priv *priv;
+
+	priv = container_of(work, struct owl_emac_priv, mac_reset_task);
+
+	netdev_dbg(priv->netdev, "resetting MAC\n");
+	owl_emac_disable(priv->netdev, false);
+	owl_emac_enable(priv->netdev, false);
+}
+
+static struct net_device_stats *
+owl_emac_ndo_get_stats(struct net_device *netdev)
+{
+	/* FIXME: If possible, try to get stats from MAC hardware registers
+	 * instead of tracking them manually in the driver.
+	 */
+
+	return &netdev->stats;
+}
+
+static const struct net_device_ops owl_emac_netdev_ops = {
+	.ndo_open		= owl_emac_ndo_open,
+	.ndo_stop		= owl_emac_ndo_stop,
+	.ndo_start_xmit		= owl_emac_ndo_start_xmit,
+	.ndo_set_rx_mode	= owl_emac_ndo_set_rx_mode,
+	.ndo_set_mac_address	= owl_emac_ndo_set_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_eth_ioctl		= owl_emac_ndo_eth_ioctl,
+	.ndo_tx_timeout         = owl_emac_ndo_tx_timeout,
+	.ndo_get_stats		= owl_emac_ndo_get_stats,
+};
+
+static void owl_emac_ethtool_get_drvinfo(struct net_device *dev,
+					 struct ethtool_drvinfo *info)
+{
+	strscpy(info->driver, OWL_EMAC_DRVNAME, sizeof(info->driver));
+}
+
+static u32 owl_emac_ethtool_get_msglevel(struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+
+	return priv->msg_enable;
+}
+
+static void owl_emac_ethtool_set_msglevel(struct net_device *ndev, u32 val)
+{
+	struct owl_emac_priv *priv = netdev_priv(ndev);
+
+	priv->msg_enable = val;
+}
+
+static const struct ethtool_ops owl_emac_ethtool_ops = {
+	.get_drvinfo		= owl_emac_ethtool_get_drvinfo,
+	.get_link		= ethtool_op_get_link,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+	.get_msglevel		= owl_emac_ethtool_get_msglevel,
+	.set_msglevel		= owl_emac_ethtool_set_msglevel,
+};
+
+static int owl_emac_mdio_wait(struct owl_emac_priv *priv)
+{
+	u32 val;
+
+	/* Wait while data transfer is in progress. */
+	return readl_poll_timeout(priv->base + OWL_EMAC_REG_MAC_CSR10,
+				  val, !(val & OWL_EMAC_BIT_MAC_CSR10_SB),
+				  OWL_EMAC_POLL_DELAY_USEC,
+				  OWL_EMAC_MDIO_POLL_TIMEOUT_USEC);
+}
+
+static int owl_emac_mdio_read(struct mii_bus *bus, int addr, int regnum)
+{
+	struct owl_emac_priv *priv = bus->priv;
+	u32 data, tmp;
+	int ret;
+
+	if (regnum & MII_ADDR_C45)
+		return -EOPNOTSUPP;
+
+	data = OWL_EMAC_BIT_MAC_CSR10_SB;
+	data |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_RD << OWL_EMAC_OFF_MAC_CSR10_OPCODE;
+
+	tmp = addr << OWL_EMAC_OFF_MAC_CSR10_PHYADD;
+	data |= tmp & OWL_EMAC_MSK_MAC_CSR10_PHYADD;
+
+	tmp = regnum << OWL_EMAC_OFF_MAC_CSR10_REGADD;
+	data |= tmp & OWL_EMAC_MSK_MAC_CSR10_REGADD;
+
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, data);
+
+	ret = owl_emac_mdio_wait(priv);
+	if (ret)
+		return ret;
+
+	data = owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR10);
+	data &= OWL_EMAC_MSK_MAC_CSR10_DATA;
+
+	return data;
+}
+
+static int
+owl_emac_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val)
+{
+	struct owl_emac_priv *priv = bus->priv;
+	u32 data, tmp;
+
+	if (regnum & MII_ADDR_C45)
+		return -EOPNOTSUPP;
+
+	data = OWL_EMAC_BIT_MAC_CSR10_SB;
+	data |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_WR << OWL_EMAC_OFF_MAC_CSR10_OPCODE;
+
+	tmp = addr << OWL_EMAC_OFF_MAC_CSR10_PHYADD;
+	data |= tmp & OWL_EMAC_MSK_MAC_CSR10_PHYADD;
+
+	tmp = regnum << OWL_EMAC_OFF_MAC_CSR10_REGADD;
+	data |= tmp & OWL_EMAC_MSK_MAC_CSR10_REGADD;
+
+	data |= val & OWL_EMAC_MSK_MAC_CSR10_DATA;
+
+	owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, data);
+
+	return owl_emac_mdio_wait(priv);
+}
+
+static int owl_emac_mdio_init(struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	struct device *dev = owl_emac_get_dev(priv);
+	struct device_node *mdio_node;
+	int ret;
+
+	mdio_node = of_get_child_by_name(dev->of_node, "mdio");
+	if (!mdio_node)
+		return -ENODEV;
+
+	if (!of_device_is_available(mdio_node)) {
+		ret = -ENODEV;
+		goto err_put_node;
+	}
+
+	priv->mii = devm_mdiobus_alloc(dev);
+	if (!priv->mii) {
+		ret = -ENOMEM;
+		goto err_put_node;
+	}
+
+	snprintf(priv->mii->id, MII_BUS_ID_SIZE, "%s", dev_name(dev));
+	priv->mii->name = "owl-emac-mdio";
+	priv->mii->parent = dev;
+	priv->mii->read = owl_emac_mdio_read;
+	priv->mii->write = owl_emac_mdio_write;
+	priv->mii->phy_mask = ~0; /* Mask out all PHYs from auto probing. */
+	priv->mii->priv = priv;
+
+	ret = devm_of_mdiobus_register(dev, priv->mii, mdio_node);
+
+err_put_node:
+	of_node_put(mdio_node);
+	return ret;
+}
+
+static int owl_emac_phy_init(struct net_device *netdev)
+{
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	struct device *dev = owl_emac_get_dev(priv);
+	struct phy_device *phy;
+
+	phy = of_phy_get_and_connect(netdev, dev->of_node,
+				     owl_emac_adjust_link);
+	if (!phy)
+		return -ENODEV;
+
+	phy_set_sym_pause(phy, true, true, true);
+
+	if (netif_msg_link(priv))
+		phy_attached_info(phy);
+
+	return 0;
+}
+
+static void owl_emac_get_mac_addr(struct net_device *netdev)
+{
+	struct device *dev = netdev->dev.parent;
+	int ret;
+
+	ret = platform_get_ethdev_address(dev, netdev);
+	if (!ret && is_valid_ether_addr(netdev->dev_addr))
+		return;
+
+	eth_hw_addr_random(netdev);
+	dev_warn(dev, "using random MAC address %pM\n", netdev->dev_addr);
+}
+
+static __maybe_unused int owl_emac_suspend(struct device *dev)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+
+	disable_irq(netdev->irq);
+
+	if (netif_running(netdev)) {
+		owl_emac_disable(netdev, true);
+		netif_device_detach(netdev);
+	}
+
+	clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks);
+
+	return 0;
+}
+
+static __maybe_unused int owl_emac_resume(struct device *dev)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct owl_emac_priv *priv = netdev_priv(netdev);
+	int ret;
+
+	ret = clk_bulk_prepare_enable(OWL_EMAC_NCLKS, priv->clks);
+	if (ret)
+		return ret;
+
+	if (netif_running(netdev)) {
+		owl_emac_core_hw_reset(priv);
+		owl_emac_core_sw_reset(priv);
+
+		ret = owl_emac_enable(netdev, true);
+		if (ret) {
+			clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks);
+			return ret;
+		}
+
+		netif_device_attach(netdev);
+	}
+
+	enable_irq(netdev->irq);
+
+	return 0;
+}
+
+static void owl_emac_clk_disable_unprepare(void *data)
+{
+	struct owl_emac_priv *priv = data;
+
+	clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks);
+}
+
+static int owl_emac_clk_set_rate(struct owl_emac_priv *priv)
+{
+	struct device *dev = owl_emac_get_dev(priv);
+	unsigned long rate;
+	int ret;
+
+	switch (priv->phy_mode) {
+	case PHY_INTERFACE_MODE_RMII:
+		rate = 50000000;
+		break;
+
+	case PHY_INTERFACE_MODE_SMII:
+		rate = 125000000;
+		break;
+
+	default:
+		dev_err(dev, "unsupported phy interface mode %d\n",
+			priv->phy_mode);
+		return -EOPNOTSUPP;
+	}
+
+	ret = clk_set_rate(priv->clks[OWL_EMAC_CLK_RMII].clk, rate);
+	if (ret)
+		dev_err(dev, "failed to set RMII clock rate: %d\n", ret);
+
+	return ret;
+}
+
+static int owl_emac_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct net_device *netdev;
+	struct owl_emac_priv *priv;
+	int ret, i;
+
+	netdev = devm_alloc_etherdev(dev, sizeof(*priv));
+	if (!netdev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, netdev);
+	SET_NETDEV_DEV(netdev, dev);
+
+	priv = netdev_priv(netdev);
+	priv->netdev = netdev;
+	priv->msg_enable = netif_msg_init(-1, OWL_EMAC_DEFAULT_MSG_ENABLE);
+
+	ret = of_get_phy_mode(dev->of_node, &priv->phy_mode);
+	if (ret) {
+		dev_err(dev, "failed to get phy mode: %d\n", ret);
+		return ret;
+	}
+
+	spin_lock_init(&priv->lock);
+
+	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (ret) {
+		dev_err(dev, "unsupported DMA mask\n");
+		return ret;
+	}
+
+	ret = owl_emac_ring_alloc(dev, &priv->rx_ring, OWL_EMAC_RX_RING_SIZE);
+	if (ret)
+		return ret;
+
+	ret = owl_emac_ring_alloc(dev, &priv->tx_ring, OWL_EMAC_TX_RING_SIZE);
+	if (ret)
+		return ret;
+
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	netdev->irq = platform_get_irq(pdev, 0);
+	if (netdev->irq < 0)
+		return netdev->irq;
+
+	ret = devm_request_irq(dev, netdev->irq, owl_emac_handle_irq,
+			       IRQF_SHARED, netdev->name, netdev);
+	if (ret) {
+		dev_err(dev, "failed to request irq: %d\n", netdev->irq);
+		return ret;
+	}
+
+	for (i = 0; i < OWL_EMAC_NCLKS; i++)
+		priv->clks[i].id = owl_emac_clk_names[i];
+
+	ret = devm_clk_bulk_get(dev, OWL_EMAC_NCLKS, priv->clks);
+	if (ret)
+		return ret;
+
+	ret = clk_bulk_prepare_enable(OWL_EMAC_NCLKS, priv->clks);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(dev, owl_emac_clk_disable_unprepare, priv);
+	if (ret)
+		return ret;
+
+	ret = owl_emac_clk_set_rate(priv);
+	if (ret)
+		return ret;
+
+	priv->reset = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(priv->reset))
+		return dev_err_probe(dev, PTR_ERR(priv->reset),
+				     "failed to get reset control");
+
+	owl_emac_get_mac_addr(netdev);
+
+	owl_emac_core_hw_reset(priv);
+	owl_emac_mdio_clock_enable(priv);
+
+	ret = owl_emac_mdio_init(netdev);
+	if (ret) {
+		dev_err(dev, "failed to initialize MDIO bus\n");
+		return ret;
+	}
+
+	ret = owl_emac_phy_init(netdev);
+	if (ret) {
+		dev_err(dev, "failed to initialize PHY\n");
+		return ret;
+	}
+
+	INIT_WORK(&priv->mac_reset_task, owl_emac_reset_task);
+
+	netdev->min_mtu = OWL_EMAC_MTU_MIN;
+	netdev->max_mtu = OWL_EMAC_MTU_MAX;
+	netdev->watchdog_timeo = OWL_EMAC_TX_TIMEOUT;
+	netdev->netdev_ops = &owl_emac_netdev_ops;
+	netdev->ethtool_ops = &owl_emac_ethtool_ops;
+	netif_napi_add(netdev, &priv->napi, owl_emac_poll);
+
+	ret = devm_register_netdev(dev, netdev);
+	if (ret) {
+		netif_napi_del(&priv->napi);
+		phy_disconnect(netdev->phydev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int owl_emac_remove(struct platform_device *pdev)
+{
+	struct owl_emac_priv *priv = platform_get_drvdata(pdev);
+
+	netif_napi_del(&priv->napi);
+	phy_disconnect(priv->netdev->phydev);
+	cancel_work_sync(&priv->mac_reset_task);
+
+	return 0;
+}
+
+static const struct of_device_id owl_emac_of_match[] = {
+	{ .compatible = "actions,owl-emac", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, owl_emac_of_match);
+
+static SIMPLE_DEV_PM_OPS(owl_emac_pm_ops,
+			 owl_emac_suspend, owl_emac_resume);
+
+static struct platform_driver owl_emac_driver = {
+	.driver = {
+		.name = OWL_EMAC_DRVNAME,
+		.of_match_table = owl_emac_of_match,
+		.pm = &owl_emac_pm_ops,
+	},
+	.probe = owl_emac_probe,
+	.remove = owl_emac_remove,
+};
+module_platform_driver(owl_emac_driver);
+
+MODULE_DESCRIPTION("Actions Semi Owl SoCs Ethernet MAC Driver");
+MODULE_AUTHOR("Actions Semi Inc.");
+MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
+MODULE_LICENSE("GPL");