Initial import

1 files changed, 2935 insertions, 0 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
new file mode 100644
index 000000000..fc646a41d
--- /dev/null
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -0,0 +1,2935 @@
+/*
+ * Cadence MACB/GEM Ethernet Controller driver
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/circ_buf.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_data/macb.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+
+#include "macb.h"
+
+#define MACB_RX_BUFFER_SIZE	128
+#define RX_BUFFER_MULTIPLE	64  /* bytes */
+#define RX_RING_SIZE		512 /* must be power of 2 */
+#define RX_RING_BYTES		(sizeof(struct macb_dma_desc) * RX_RING_SIZE)
+
+#define TX_RING_SIZE		128 /* must be power of 2 */
+#define TX_RING_BYTES		(sizeof(struct macb_dma_desc) * TX_RING_SIZE)
+
+/* level of occupied TX descriptors under which we wake up TX process */
+#define MACB_TX_WAKEUP_THRESH	(3 * TX_RING_SIZE / 4)
+
+#define MACB_RX_INT_FLAGS	(MACB_BIT(RCOMP) | MACB_BIT(RXUBR)	\
+				 | MACB_BIT(ISR_ROVR))
+#define MACB_TX_ERR_FLAGS	(MACB_BIT(ISR_TUND)			\
+					| MACB_BIT(ISR_RLE)		\
+					| MACB_BIT(TXERR))
+#define MACB_TX_INT_FLAGS	(MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP))
+
+#define MACB_MAX_TX_LEN		((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1))
+#define GEM_MAX_TX_LEN		((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1))
+
+/*
+ * Graceful stop timeouts in us. We should allow up to
+ * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
+ */
+#define MACB_HALT_TIMEOUT	1230
+
+/* Ring buffer accessors */
+static unsigned int macb_tx_ring_wrap(unsigned int index)
+{
+	return index & (TX_RING_SIZE - 1);
+}
+
+static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
+					  unsigned int index)
+{
+	return &queue->tx_ring[macb_tx_ring_wrap(index)];
+}
+
+static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
+				       unsigned int index)
+{
+	return &queue->tx_skb[macb_tx_ring_wrap(index)];
+}
+
+static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
+{
+	dma_addr_t offset;
+
+	offset = macb_tx_ring_wrap(index) * sizeof(struct macb_dma_desc);
+
+	return queue->tx_ring_dma + offset;
+}
+
+static unsigned int macb_rx_ring_wrap(unsigned int index)
+{
+	return index & (RX_RING_SIZE - 1);
+}
+
+static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index)
+{
+	return &bp->rx_ring[macb_rx_ring_wrap(index)];
+}
+
+static void *macb_rx_buffer(struct macb *bp, unsigned int index)
+{
+	return bp->rx_buffers + bp->rx_buffer_size * macb_rx_ring_wrap(index);
+}
+
+static void macb_set_hwaddr(struct macb *bp)
+{
+	u32 bottom;
+	u16 top;
+
+	bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
+	macb_or_gem_writel(bp, SA1B, bottom);
+	top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
+	macb_or_gem_writel(bp, SA1T, top);
+
+	/* Clear unused address register sets */
+	macb_or_gem_writel(bp, SA2B, 0);
+	macb_or_gem_writel(bp, SA2T, 0);
+	macb_or_gem_writel(bp, SA3B, 0);
+	macb_or_gem_writel(bp, SA3T, 0);
+	macb_or_gem_writel(bp, SA4B, 0);
+	macb_or_gem_writel(bp, SA4T, 0);
+}
+
+static void macb_get_hwaddr(struct macb *bp)
+{
+	struct macb_platform_data *pdata;
+	u32 bottom;
+	u16 top;
+	u8 addr[6];
+	int i;
+
+	pdata = dev_get_platdata(&bp->pdev->dev);
+
+	/* Check all 4 address register for vaild address */
+	for (i = 0; i < 4; i++) {
+		bottom = macb_or_gem_readl(bp, SA1B + i * 8);
+		top = macb_or_gem_readl(bp, SA1T + i * 8);
+
+		if (pdata && pdata->rev_eth_addr) {
+			addr[5] = bottom & 0xff;
+			addr[4] = (bottom >> 8) & 0xff;
+			addr[3] = (bottom >> 16) & 0xff;
+			addr[2] = (bottom >> 24) & 0xff;
+			addr[1] = top & 0xff;
+			addr[0] = (top & 0xff00) >> 8;
+		} else {
+			addr[0] = bottom & 0xff;
+			addr[1] = (bottom >> 8) & 0xff;
+			addr[2] = (bottom >> 16) & 0xff;
+			addr[3] = (bottom >> 24) & 0xff;
+			addr[4] = top & 0xff;
+			addr[5] = (top >> 8) & 0xff;
+		}
+
+		if (is_valid_ether_addr(addr)) {
+			memcpy(bp->dev->dev_addr, addr, sizeof(addr));
+			return;
+		}
+	}
+
+	netdev_info(bp->dev, "invalid hw address, using random\n");
+	eth_hw_addr_random(bp->dev);
+}
+
+static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+	struct macb *bp = bus->priv;
+	int value;
+
+	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
+			      | MACB_BF(RW, MACB_MAN_READ)
+			      | MACB_BF(PHYA, mii_id)
+			      | MACB_BF(REGA, regnum)
+			      | MACB_BF(CODE, MACB_MAN_CODE)));
+
+	/* wait for end of transfer */
+	while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
+		cpu_relax();
+
+	value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
+
+	return value;
+}
+
+static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
+			   u16 value)
+{
+	struct macb *bp = bus->priv;
+
+	macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
+			      | MACB_BF(RW, MACB_MAN_WRITE)
+			      | MACB_BF(PHYA, mii_id)
+			      | MACB_BF(REGA, regnum)
+			      | MACB_BF(CODE, MACB_MAN_CODE)
+			      | MACB_BF(DATA, value)));
+
+	/* wait for end of transfer */
+	while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
+		cpu_relax();
+
+	return 0;
+}
+
+/**
+ * macb_set_tx_clk() - Set a clock to a new frequency
+ * @clk		Pointer to the clock to change
+ * @rate	New frequency in Hz
+ * @dev		Pointer to the struct net_device
+ */
+static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
+{
+	long ferr, rate, rate_rounded;
+
+	if (!clk)
+		return;
+
+	switch (speed) {
+	case SPEED_10:
+		rate = 2500000;
+		break;
+	case SPEED_100:
+		rate = 25000000;
+		break;
+	case SPEED_1000:
+		rate = 125000000;
+		break;
+	default:
+		return;
+	}
+
+	rate_rounded = clk_round_rate(clk, rate);
+	if (rate_rounded < 0)
+		return;
+
+	/* RGMII allows 50 ppm frequency error. Test and warn if this limit
+	 * is not satisfied.
+	 */
+	ferr = abs(rate_rounded - rate);
+	ferr = DIV_ROUND_UP(ferr, rate / 100000);
+	if (ferr > 5)
+		netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
+				rate);
+
+	if (clk_set_rate(clk, rate_rounded))
+		netdev_err(dev, "adjusting tx_clk failed.\n");
+}
+
+static void macb_handle_link_change(struct net_device *dev)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct phy_device *phydev = bp->phy_dev;
+	unsigned long flags;
+
+	int status_change = 0;
+
+	spin_lock_irqsave(&bp->lock, flags);
+
+	if (phydev->link) {
+		if ((bp->speed != phydev->speed) ||
+		    (bp->duplex != phydev->duplex)) {
+			u32 reg;
+
+			reg = macb_readl(bp, NCFGR);
+			reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
+			if (macb_is_gem(bp))
+				reg &= ~GEM_BIT(GBE);
+
+			if (phydev->duplex)
+				reg |= MACB_BIT(FD);
+			if (phydev->speed == SPEED_100)
+				reg |= MACB_BIT(SPD);
+			if (phydev->speed == SPEED_1000 &&
+			    bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
+				reg |= GEM_BIT(GBE);
+
+			macb_or_gem_writel(bp, NCFGR, reg);
+
+			bp->speed = phydev->speed;
+			bp->duplex = phydev->duplex;
+			status_change = 1;
+		}
+	}
+
+	if (phydev->link != bp->link) {
+		if (!phydev->link) {
+			bp->speed = 0;
+			bp->duplex = -1;
+		}
+		bp->link = phydev->link;
+
+		status_change = 1;
+	}
+
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	if (status_change) {
+		if (phydev->link) {
+			/* Update the TX clock rate if and only if the link is
+			 * up and there has been a link change.
+			 */
+			macb_set_tx_clk(bp->tx_clk, phydev->speed, dev);
+
+			netif_carrier_on(dev);
+			netdev_info(dev, "link up (%d/%s)\n",
+				    phydev->speed,
+				    phydev->duplex == DUPLEX_FULL ?
+				    "Full" : "Half");
+		} else {
+			netif_carrier_off(dev);
+			netdev_info(dev, "link down\n");
+		}
+	}
+}
+
+/* based on au1000_eth. c*/
+static int macb_mii_probe(struct net_device *dev)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct macb_platform_data *pdata;
+	struct phy_device *phydev;
+	int phy_irq;
+	int ret;
+
+	phydev = phy_find_first(bp->mii_bus);
+	if (!phydev) {
+		netdev_err(dev, "no PHY found\n");
+		return -ENXIO;
+	}
+
+	pdata = dev_get_platdata(&bp->pdev->dev);
+	if (pdata && gpio_is_valid(pdata->phy_irq_pin)) {
+		ret = devm_gpio_request(&bp->pdev->dev, pdata->phy_irq_pin, "phy int");
+		if (!ret) {
+			phy_irq = gpio_to_irq(pdata->phy_irq_pin);
+			phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
+		}
+	}
+
+	/* attach the mac to the phy */
+	ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
+				 bp->phy_interface);
+	if (ret) {
+		netdev_err(dev, "Could not attach to PHY\n");
+		return ret;
+	}
+
+	/* mask with MAC supported features */
+	if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
+		phydev->supported &= PHY_GBIT_FEATURES;
+	else
+		phydev->supported &= PHY_BASIC_FEATURES;
+
+	if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF)
+		phydev->supported &= ~SUPPORTED_1000baseT_Half;
+
+	phydev->advertising = phydev->supported;
+
+	bp->link = 0;
+	bp->speed = 0;
+	bp->duplex = -1;
+	bp->phy_dev = phydev;
+
+	return 0;
+}
+
+static int macb_mii_init(struct macb *bp)
+{
+	struct macb_platform_data *pdata;
+	struct device_node *np;
+	int err = -ENXIO, i;
+
+	/* Enable management port */
+	macb_writel(bp, NCR, MACB_BIT(MPE));
+
+	bp->mii_bus = mdiobus_alloc();
+	if (bp->mii_bus == NULL) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	bp->mii_bus->name = "MACB_mii_bus";
+	bp->mii_bus->read = &macb_mdio_read;
+	bp->mii_bus->write = &macb_mdio_write;
+	snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
+		bp->pdev->name, bp->pdev->id);
+	bp->mii_bus->priv = bp;
+	bp->mii_bus->parent = &bp->dev->dev;
+	pdata = dev_get_platdata(&bp->pdev->dev);
+
+	bp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
+	if (!bp->mii_bus->irq) {
+		err = -ENOMEM;
+		goto err_out_free_mdiobus;
+	}
+
+	dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
+
+	np = bp->pdev->dev.of_node;
+	if (np) {
+		/* try dt phy registration */
+		err = of_mdiobus_register(bp->mii_bus, np);
+
+		/* fallback to standard phy registration if no phy were
+		   found during dt phy registration */
+		if (!err && !phy_find_first(bp->mii_bus)) {
+			for (i = 0; i < PHY_MAX_ADDR; i++) {
+				struct phy_device *phydev;
+
+				phydev = mdiobus_scan(bp->mii_bus, i);
+				if (IS_ERR(phydev)) {
+					err = PTR_ERR(phydev);
+					break;
+				}
+			}
+
+			if (err)
+				goto err_out_unregister_bus;
+		}
+	} else {
+		for (i = 0; i < PHY_MAX_ADDR; i++)
+			bp->mii_bus->irq[i] = PHY_POLL;
+
+		if (pdata)
+			bp->mii_bus->phy_mask = pdata->phy_mask;
+
+		err = mdiobus_register(bp->mii_bus);
+	}
+
+	if (err)
+		goto err_out_free_mdio_irq;
+
+	err = macb_mii_probe(bp->dev);
+	if (err)
+		goto err_out_unregister_bus;
+
+	return 0;
+
+err_out_unregister_bus:
+	mdiobus_unregister(bp->mii_bus);
+err_out_free_mdio_irq:
+	kfree(bp->mii_bus->irq);
+err_out_free_mdiobus:
+	mdiobus_free(bp->mii_bus);
+err_out:
+	return err;
+}
+
+static void macb_update_stats(struct macb *bp)
+{
+	u32 __iomem *reg = bp->regs + MACB_PFR;
+	u32 *p = &bp->hw_stats.macb.rx_pause_frames;
+	u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
+
+	WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
+
+	for(; p < end; p++, reg++)
+		*p += readl_relaxed(reg);
+}
+
+static int macb_halt_tx(struct macb *bp)
+{
+	unsigned long	halt_time, timeout;
+	u32		status;
+
+	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
+
+	timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
+	do {
+		halt_time = jiffies;
+		status = macb_readl(bp, TSR);
+		if (!(status & MACB_BIT(TGO)))
+			return 0;
+
+		usleep_range(10, 250);
+	} while (time_before(halt_time, timeout));
+
+	return -ETIMEDOUT;
+}
+
+static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
+{
+	if (tx_skb->mapping) {
+		if (tx_skb->mapped_as_page)
+			dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
+				       tx_skb->size, DMA_TO_DEVICE);
+		else
+			dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
+					 tx_skb->size, DMA_TO_DEVICE);
+		tx_skb->mapping = 0;
+	}
+
+	if (tx_skb->skb) {
+		dev_kfree_skb_any(tx_skb->skb);
+		tx_skb->skb = NULL;
+	}
+}
+
+static void macb_tx_error_task(struct work_struct *work)
+{
+	struct macb_queue	*queue = container_of(work, struct macb_queue,
+						      tx_error_task);
+	struct macb		*bp = queue->bp;
+	struct macb_tx_skb	*tx_skb;
+	struct macb_dma_desc	*desc;
+	struct sk_buff		*skb;
+	unsigned int		tail;
+	unsigned long		flags;
+
+	netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
+		    (unsigned int)(queue - bp->queues),
+		    queue->tx_tail, queue->tx_head);
+
+	/* Prevent the queue IRQ handlers from running: each of them may call
+	 * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
+	 * As explained below, we have to halt the transmission before updating
+	 * TBQP registers so we call netif_tx_stop_all_queues() to notify the
+	 * network engine about the macb/gem being halted.
+	 */
+	spin_lock_irqsave(&bp->lock, flags);
+
+	/* Make sure nobody is trying to queue up new packets */
+	netif_tx_stop_all_queues(bp->dev);
+
+	/*
+	 * Stop transmission now
+	 * (in case we have just queued new packets)
+	 * macb/gem must be halted to write TBQP register
+	 */
+	if (macb_halt_tx(bp))
+		/* Just complain for now, reinitializing TX path can be good */
+		netdev_err(bp->dev, "BUG: halt tx timed out\n");
+
+	/*
+	 * Treat frames in TX queue including the ones that caused the error.
+	 * Free transmit buffers in upper layer.
+	 */
+	for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
+		u32	ctrl;
+
+		desc = macb_tx_desc(queue, tail);
+		ctrl = desc->ctrl;
+		tx_skb = macb_tx_skb(queue, tail);
+		skb = tx_skb->skb;
+
+		if (ctrl & MACB_BIT(TX_USED)) {
+			/* skb is set for the last buffer of the frame */
+			while (!skb) {
+				macb_tx_unmap(bp, tx_skb);
+				tail++;
+				tx_skb = macb_tx_skb(queue, tail);
+				skb = tx_skb->skb;
+			}
+
+			/* ctrl still refers to the first buffer descriptor
+			 * since it's the only one written back by the hardware
+			 */
+			if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
+				netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
+					    macb_tx_ring_wrap(tail), skb->data);
+				bp->stats.tx_packets++;
+				bp->stats.tx_bytes += skb->len;
+			}
+		} else {
+			/*
+			 * "Buffers exhausted mid-frame" errors may only happen
+			 * if the driver is buggy, so complain loudly about those.
+			 * Statistics are updated by hardware.
+			 */
+			if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
+				netdev_err(bp->dev,
+					   "BUG: TX buffers exhausted mid-frame\n");
+
+			desc->ctrl = ctrl | MACB_BIT(TX_USED);
+		}
+
+		macb_tx_unmap(bp, tx_skb);
+	}
+
+	/* Set end of TX queue */
+	desc = macb_tx_desc(queue, 0);
+	desc->addr = 0;
+	desc->ctrl = MACB_BIT(TX_USED);
+
+	/* Make descriptor updates visible to hardware */
+	wmb();
+
+	/* Reinitialize the TX desc queue */
+	queue_writel(queue, TBQP, queue->tx_ring_dma);
+	/* Make TX ring reflect state of hardware */
+	queue->tx_head = 0;
+	queue->tx_tail = 0;
+
+	/* Housework before enabling TX IRQ */
+	macb_writel(bp, TSR, macb_readl(bp, TSR));
+	queue_writel(queue, IER, MACB_TX_INT_FLAGS);
+
+	/* Now we are ready to start transmission again */
+	netif_tx_start_all_queues(bp->dev);
+	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+
+	spin_unlock_irqrestore(&bp->lock, flags);
+}
+
+static void macb_tx_interrupt(struct macb_queue *queue)
+{
+	unsigned int tail;
+	unsigned int head;
+	u32 status;
+	struct macb *bp = queue->bp;
+	u16 queue_index = queue - bp->queues;
+
+	status = macb_readl(bp, TSR);
+	macb_writel(bp, TSR, status);
+
+	if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+		queue_writel(queue, ISR, MACB_BIT(TCOMP));
+
+	netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
+		(unsigned long)status);
+
+	head = queue->tx_head;
+	for (tail = queue->tx_tail; tail != head; tail++) {
+		struct macb_tx_skb	*tx_skb;
+		struct sk_buff		*skb;
+		struct macb_dma_desc	*desc;
+		u32			ctrl;
+
+		desc = macb_tx_desc(queue, tail);
+
+		/* Make hw descriptor updates visible to CPU */
+		rmb();
+
+		ctrl = desc->ctrl;
+
+		/* TX_USED bit is only set by hardware on the very first buffer
+		 * descriptor of the transmitted frame.
+		 */
+		if (!(ctrl & MACB_BIT(TX_USED)))
+			break;
+
+		/* Process all buffers of the current transmitted frame */
+		for (;; tail++) {
+			tx_skb = macb_tx_skb(queue, tail);
+			skb = tx_skb->skb;
+
+			/* First, update TX stats if needed */
+			if (skb) {
+				netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
+					    macb_tx_ring_wrap(tail), skb->data);
+				bp->stats.tx_packets++;
+				bp->stats.tx_bytes += skb->len;
+			}
+
+			/* Now we can safely release resources */
+			macb_tx_unmap(bp, tx_skb);
+
+			/* skb is set only for the last buffer of the frame.
+			 * WARNING: at this point skb has been freed by
+			 * macb_tx_unmap().
+			 */
+			if (skb)
+				break;
+		}
+	}
+
+	queue->tx_tail = tail;
+	if (__netif_subqueue_stopped(bp->dev, queue_index) &&
+	    CIRC_CNT(queue->tx_head, queue->tx_tail,
+		     TX_RING_SIZE) <= MACB_TX_WAKEUP_THRESH)
+		netif_wake_subqueue(bp->dev, queue_index);
+}
+
+static void gem_rx_refill(struct macb *bp)
+{
+	unsigned int		entry;
+	struct sk_buff		*skb;
+	dma_addr_t		paddr;
+
+	while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, RX_RING_SIZE) > 0) {
+		entry = macb_rx_ring_wrap(bp->rx_prepared_head);
+
+		/* Make hw descriptor updates visible to CPU */
+		rmb();
+
+		bp->rx_prepared_head++;
+
+		if (bp->rx_skbuff[entry] == NULL) {
+			/* allocate sk_buff for this free entry in ring */
+			skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
+			if (unlikely(skb == NULL)) {
+				netdev_err(bp->dev,
+					   "Unable to allocate sk_buff\n");
+				break;
+			}
+
+			/* now fill corresponding descriptor entry */
+			paddr = dma_map_single(&bp->pdev->dev, skb->data,
+					       bp->rx_buffer_size, DMA_FROM_DEVICE);
+			if (dma_mapping_error(&bp->pdev->dev, paddr)) {
+				dev_kfree_skb(skb);
+				break;
+			}
+
+			bp->rx_skbuff[entry] = skb;
+
+			if (entry == RX_RING_SIZE - 1)
+				paddr |= MACB_BIT(RX_WRAP);
+			bp->rx_ring[entry].addr = paddr;
+			bp->rx_ring[entry].ctrl = 0;
+
+			/* properly align Ethernet header */
+			skb_reserve(skb, NET_IP_ALIGN);
+		} else {
+			bp->rx_ring[entry].addr &= ~MACB_BIT(RX_USED);
+			bp->rx_ring[entry].ctrl = 0;
+		}
+	}
+
+	/* Make descriptor updates visible to hardware */
+	wmb();
+
+	netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n",
+		   bp->rx_prepared_head, bp->rx_tail);
+}
+
+/* Mark DMA descriptors from begin up to and not including end as unused */
+static void discard_partial_frame(struct macb *bp, unsigned int begin,
+				  unsigned int end)
+{
+	unsigned int frag;
+
+	for (frag = begin; frag != end; frag++) {
+		struct macb_dma_desc *desc = macb_rx_desc(bp, frag);
+		desc->addr &= ~MACB_BIT(RX_USED);
+	}
+
+	/* Make descriptor updates visible to hardware */
+	wmb();
+
+	/*
+	 * When this happens, the hardware stats registers for
+	 * whatever caused this is updated, so we don't have to record
+	 * anything.
+	 */
+}
+
+static int gem_rx(struct macb *bp, int budget)
+{
+	unsigned int		len;
+	unsigned int		entry;
+	struct sk_buff		*skb;
+	struct macb_dma_desc	*desc;
+	int			count = 0;
+
+	while (count < budget) {
+		u32 addr, ctrl;
+
+		entry = macb_rx_ring_wrap(bp->rx_tail);
+		desc = &bp->rx_ring[entry];
+
+		/* Make hw descriptor updates visible to CPU */
+		rmb();
+
+		addr = desc->addr;
+		ctrl = desc->ctrl;
+
+		if (!(addr & MACB_BIT(RX_USED)))
+			break;
+
+		bp->rx_tail++;
+		count++;
+
+		if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
+			netdev_err(bp->dev,
+				   "not whole frame pointed by descriptor\n");
+			bp->stats.rx_dropped++;
+			break;
+		}
+		skb = bp->rx_skbuff[entry];
+		if (unlikely(!skb)) {
+			netdev_err(bp->dev,
+				   "inconsistent Rx descriptor chain\n");
+			bp->stats.rx_dropped++;
+			break;
+		}
+		/* now everything is ready for receiving packet */
+		bp->rx_skbuff[entry] = NULL;
+		len = MACB_BFEXT(RX_FRMLEN, ctrl);
+
+		netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
+
+		skb_put(skb, len);
+		addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, addr));
+		dma_unmap_single(&bp->pdev->dev, addr,
+				 bp->rx_buffer_size, DMA_FROM_DEVICE);
+
+		skb->protocol = eth_type_trans(skb, bp->dev);
+		skb_checksum_none_assert(skb);
+		if (bp->dev->features & NETIF_F_RXCSUM &&
+		    !(bp->dev->flags & IFF_PROMISC) &&
+		    GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+		bp->stats.rx_packets++;
+		bp->stats.rx_bytes += skb->len;
+
+#if defined(DEBUG) && defined(VERBOSE_DEBUG)
+		netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
+			    skb->len, skb->csum);
+		print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
+			       skb_mac_header(skb), 16, true);
+		print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
+			       skb->data, 32, true);
+#endif
+
+		netif_receive_skb(skb);
+	}
+
+	gem_rx_refill(bp);
+
+	return count;
+}
+
+static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
+			 unsigned int last_frag)
+{
+	unsigned int len;
+	unsigned int frag;
+	unsigned int offset;
+	struct sk_buff *skb;
+	struct macb_dma_desc *desc;
+
+	desc = macb_rx_desc(bp, last_frag);
+	len = MACB_BFEXT(RX_FRMLEN, desc->ctrl);
+
+	netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
+		macb_rx_ring_wrap(first_frag),
+		macb_rx_ring_wrap(last_frag), len);
+
+	/*
+	 * The ethernet header starts NET_IP_ALIGN bytes into the
+	 * first buffer. Since the header is 14 bytes, this makes the
+	 * payload word-aligned.
+	 *
+	 * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
+	 * the two padding bytes into the skb so that we avoid hitting
+	 * the slowpath in memcpy(), and pull them off afterwards.
+	 */
+	skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
+	if (!skb) {
+		bp->stats.rx_dropped++;
+		for (frag = first_frag; ; frag++) {
+			desc = macb_rx_desc(bp, frag);
+			desc->addr &= ~MACB_BIT(RX_USED);
+			if (frag == last_frag)
+				break;
+		}
+
+		/* Make descriptor updates visible to hardware */
+		wmb();
+
+		return 1;
+	}
+
+	offset = 0;
+	len += NET_IP_ALIGN;
+	skb_checksum_none_assert(skb);
+	skb_put(skb, len);
+
+	for (frag = first_frag; ; frag++) {
+		unsigned int frag_len = bp->rx_buffer_size;
+
+		if (offset + frag_len > len) {
+			BUG_ON(frag != last_frag);
+			frag_len = len - offset;
+		}
+		skb_copy_to_linear_data_offset(skb, offset,
+				macb_rx_buffer(bp, frag), frag_len);
+		offset += bp->rx_buffer_size;
+		desc = macb_rx_desc(bp, frag);
+		desc->addr &= ~MACB_BIT(RX_USED);
+
+		if (frag == last_frag)
+			break;
+	}
+
+	/* Make descriptor updates visible to hardware */
+	wmb();
+
+	__skb_pull(skb, NET_IP_ALIGN);
+	skb->protocol = eth_type_trans(skb, bp->dev);
+
+	bp->stats.rx_packets++;
+	bp->stats.rx_bytes += skb->len;
+	netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
+		   skb->len, skb->csum);
+	netif_receive_skb(skb);
+
+	return 0;
+}
+
+static int macb_rx(struct macb *bp, int budget)
+{
+	int received = 0;
+	unsigned int tail;
+	int first_frag = -1;
+
+	for (tail = bp->rx_tail; budget > 0; tail++) {
+		struct macb_dma_desc *desc = macb_rx_desc(bp, tail);
+		u32 addr, ctrl;
+
+		/* Make hw descriptor updates visible to CPU */
+		rmb();
+
+		addr = desc->addr;
+		ctrl = desc->ctrl;
+
+		if (!(addr & MACB_BIT(RX_USED)))
+			break;
+
+		if (ctrl & MACB_BIT(RX_SOF)) {
+			if (first_frag != -1)
+				discard_partial_frame(bp, first_frag, tail);
+			first_frag = tail;
+		}
+
+		if (ctrl & MACB_BIT(RX_EOF)) {
+			int dropped;
+			BUG_ON(first_frag == -1);
+
+			dropped = macb_rx_frame(bp, first_frag, tail);
+			first_frag = -1;
+			if (!dropped) {
+				received++;
+				budget--;
+			}
+		}
+	}
+
+	if (first_frag != -1)
+		bp->rx_tail = first_frag;
+	else
+		bp->rx_tail = tail;
+
+	return received;
+}
+
+static int macb_poll(struct napi_struct *napi, int budget)
+{
+	struct macb *bp = container_of(napi, struct macb, napi);
+	int work_done;
+	u32 status;
+
+	status = macb_readl(bp, RSR);
+	macb_writel(bp, RSR, status);
+
+	work_done = 0;
+
+	netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
+		   (unsigned long)status, budget);
+
+	work_done = bp->macbgem_ops.mog_rx(bp, budget);
+	if (work_done < budget) {
+		napi_complete(napi);
+
+		/* Packets received while interrupts were disabled */
+		status = macb_readl(bp, RSR);
+		if (status) {
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				macb_writel(bp, ISR, MACB_BIT(RCOMP));
+			napi_reschedule(napi);
+		} else {
+			macb_writel(bp, IER, MACB_RX_INT_FLAGS);
+		}
+	}
+
+	/* TODO: Handle errors */
+
+	return work_done;
+}
+
+static irqreturn_t macb_interrupt(int irq, void *dev_id)
+{
+	struct macb_queue *queue = dev_id;
+	struct macb *bp = queue->bp;
+	struct net_device *dev = bp->dev;
+	u32 status, ctrl;
+
+	status = queue_readl(queue, ISR);
+
+	if (unlikely(!status))
+		return IRQ_NONE;
+
+	spin_lock(&bp->lock);
+
+	while (status) {
+		/* close possible race with dev_close */
+		if (unlikely(!netif_running(dev))) {
+			queue_writel(queue, IDR, -1);
+			break;
+		}
+
+		netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
+			    (unsigned int)(queue - bp->queues),
+			    (unsigned long)status);
+
+		if (status & MACB_RX_INT_FLAGS) {
+			/*
+			 * There's no point taking any more interrupts
+			 * until we have processed the buffers. The
+			 * scheduling call may fail if the poll routine
+			 * is already scheduled, so disable interrupts
+			 * now.
+			 */
+			queue_writel(queue, IDR, MACB_RX_INT_FLAGS);
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				queue_writel(queue, ISR, MACB_BIT(RCOMP));
+
+			if (napi_schedule_prep(&bp->napi)) {
+				netdev_vdbg(bp->dev, "scheduling RX softirq\n");
+				__napi_schedule(&bp->napi);
+			}
+		}
+
+		if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
+			queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
+			schedule_work(&queue->tx_error_task);
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);
+
+			break;
+		}
+
+		if (status & MACB_BIT(TCOMP))
+			macb_tx_interrupt(queue);
+
+		/*
+		 * Link change detection isn't possible with RMII, so we'll
+		 * add that if/when we get our hands on a full-blown MII PHY.
+		 */
+
+		/* There is a hardware issue under heavy load where DMA can
+		 * stop, this causes endless "used buffer descriptor read"
+		 * interrupts but it can be cleared by re-enabling RX. See
+		 * the at91 manual, section 41.3.1 or the Zynq manual
+		 * section 16.7.4 for details.
+		 */
+		if (status & MACB_BIT(RXUBR)) {
+			ctrl = macb_readl(bp, NCR);
+			macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
+			macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				macb_writel(bp, ISR, MACB_BIT(RXUBR));
+		}
+
+		if (status & MACB_BIT(ISR_ROVR)) {
+			/* We missed at least one packet */
+			if (macb_is_gem(bp))
+				bp->hw_stats.gem.rx_overruns++;
+			else
+				bp->hw_stats.macb.rx_overruns++;
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
+		}
+
+		if (status & MACB_BIT(HRESP)) {
+			/*
+			 * TODO: Reset the hardware, and maybe move the
+			 * netdev_err to a lower-priority context as well
+			 * (work queue?)
+			 */
+			netdev_err(dev, "DMA bus error: HRESP not OK\n");
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				queue_writel(queue, ISR, MACB_BIT(HRESP));
+		}
+
+		status = queue_readl(queue, ISR);
+	}
+
+	spin_unlock(&bp->lock);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling receive - used by netconsole and other diagnostic tools
+ * to allow network i/o with interrupts disabled.
+ */
+static void macb_poll_controller(struct net_device *dev)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct macb_queue *queue;
+	unsigned long flags;
+	unsigned int q;
+
+	local_irq_save(flags);
+	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
+		macb_interrupt(dev->irq, queue);
+	local_irq_restore(flags);
+}
+#endif
+
+static inline unsigned int macb_count_tx_descriptors(struct macb *bp,
+						     unsigned int len)
+{
+	return (len + bp->max_tx_length - 1) / bp->max_tx_length;
+}
+
+static unsigned int macb_tx_map(struct macb *bp,
+				struct macb_queue *queue,
+				struct sk_buff *skb)
+{
+	dma_addr_t mapping;
+	unsigned int len, entry, i, tx_head = queue->tx_head;
+	struct macb_tx_skb *tx_skb = NULL;
+	struct macb_dma_desc *desc;
+	unsigned int offset, size, count = 0;
+	unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
+	unsigned int eof = 1;
+	u32 ctrl;
+
+	/* First, map non-paged data */
+	len = skb_headlen(skb);
+	offset = 0;
+	while (len) {
+		size = min(len, bp->max_tx_length);
+		entry = macb_tx_ring_wrap(tx_head);
+		tx_skb = &queue->tx_skb[entry];
+
+		mapping = dma_map_single(&bp->pdev->dev,
+					 skb->data + offset,
+					 size, DMA_TO_DEVICE);
+		if (dma_mapping_error(&bp->pdev->dev, mapping))
+			goto dma_error;
+
+		/* Save info to properly release resources */
+		tx_skb->skb = NULL;
+		tx_skb->mapping = mapping;
+		tx_skb->size = size;
+		tx_skb->mapped_as_page = false;
+
+		len -= size;
+		offset += size;
+		count++;
+		tx_head++;
+	}
+
+	/* Then, map paged data from fragments */
+	for (f = 0; f < nr_frags; f++) {
+		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
+
+		len = skb_frag_size(frag);
+		offset = 0;
+		while (len) {
+			size = min(len, bp->max_tx_length);
+			entry = macb_tx_ring_wrap(tx_head);
+			tx_skb = &queue->tx_skb[entry];
+
+			mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
+						   offset, size, DMA_TO_DEVICE);
+			if (dma_mapping_error(&bp->pdev->dev, mapping))
+				goto dma_error;
+
+			/* Save info to properly release resources */
+			tx_skb->skb = NULL;
+			tx_skb->mapping = mapping;
+			tx_skb->size = size;
+			tx_skb->mapped_as_page = true;
+
+			len -= size;
+			offset += size;
+			count++;
+			tx_head++;
+		}
+	}
+
+	/* Should never happen */
+	if (unlikely(tx_skb == NULL)) {
+		netdev_err(bp->dev, "BUG! empty skb!\n");
+		return 0;
+	}
+
+	/* This is the last buffer of the frame: save socket buffer */
+	tx_skb->skb = skb;
+
+	/* Update TX ring: update buffer descriptors in reverse order
+	 * to avoid race condition
+	 */
+
+	/* Set 'TX_USED' bit in buffer descriptor at tx_head position
+	 * to set the end of TX queue
+	 */
+	i = tx_head;
+	entry = macb_tx_ring_wrap(i);
+	ctrl = MACB_BIT(TX_USED);
+	desc = &queue->tx_ring[entry];
+	desc->ctrl = ctrl;
+
+	do {
+		i--;
+		entry = macb_tx_ring_wrap(i);
+		tx_skb = &queue->tx_skb[entry];
+		desc = &queue->tx_ring[entry];
+
+		ctrl = (u32)tx_skb->size;
+		if (eof) {
+			ctrl |= MACB_BIT(TX_LAST);
+			eof = 0;
+		}
+		if (unlikely(entry == (TX_RING_SIZE - 1)))
+			ctrl |= MACB_BIT(TX_WRAP);
+
+		/* Set TX buffer descriptor */
+		desc->addr = tx_skb->mapping;
+		/* desc->addr must be visible to hardware before clearing
+		 * 'TX_USED' bit in desc->ctrl.
+		 */
+		wmb();
+		desc->ctrl = ctrl;
+	} while (i != queue->tx_head);
+
+	queue->tx_head = tx_head;
+
+	return count;
+
+dma_error:
+	netdev_err(bp->dev, "TX DMA map failed\n");
+
+	for (i = queue->tx_head; i != tx_head; i++) {
+		tx_skb = macb_tx_skb(queue, i);
+
+		macb_tx_unmap(bp, tx_skb);
+	}
+
+	return 0;
+}
+
+static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	u16 queue_index = skb_get_queue_mapping(skb);
+	struct macb *bp = netdev_priv(dev);
+	struct macb_queue *queue = &bp->queues[queue_index];
+	unsigned long flags;
+	unsigned int count, nr_frags, frag_size, f;
+
+#if defined(DEBUG) && defined(VERBOSE_DEBUG)
+	netdev_vdbg(bp->dev,
+		   "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
+		   queue_index, skb->len, skb->head, skb->data,
+		   skb_tail_pointer(skb), skb_end_pointer(skb));
+	print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
+		       skb->data, 16, true);
+#endif
+
+	/* Count how many TX buffer descriptors are needed to send this
+	 * socket buffer: skb fragments of jumbo frames may need to be
+	 * splitted into many buffer descriptors.
+	 */
+	count = macb_count_tx_descriptors(bp, skb_headlen(skb));
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	for (f = 0; f < nr_frags; f++) {
+		frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
+		count += macb_count_tx_descriptors(bp, frag_size);
+	}
+
+	spin_lock_irqsave(&bp->lock, flags);
+
+	/* This is a hard error, log it. */
+	if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < count) {
+		netif_stop_subqueue(dev, queue_index);
+		spin_unlock_irqrestore(&bp->lock, flags);
+		netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
+			   queue->tx_head, queue->tx_tail);
+		return NETDEV_TX_BUSY;
+	}
+
+	/* Map socket buffer for DMA transfer */
+	if (!macb_tx_map(bp, queue, skb)) {
+		dev_kfree_skb_any(skb);
+		goto unlock;
+	}
+
+	/* Make newly initialized descriptor visible to hardware */
+	wmb();
+
+	skb_tx_timestamp(skb);
+
+	macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+
+	if (CIRC_SPACE(queue->tx_head, queue->tx_tail, TX_RING_SIZE) < 1)
+		netif_stop_subqueue(dev, queue_index);
+
+unlock:
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
+{
+	if (!macb_is_gem(bp)) {
+		bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
+	} else {
+		bp->rx_buffer_size = size;
+
+		if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
+			netdev_dbg(bp->dev,
+				    "RX buffer must be multiple of %d bytes, expanding\n",
+				    RX_BUFFER_MULTIPLE);
+			bp->rx_buffer_size =
+				roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
+		}
+	}
+
+	netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%Zu]\n",
+		   bp->dev->mtu, bp->rx_buffer_size);
+}
+
+static void gem_free_rx_buffers(struct macb *bp)
+{
+	struct sk_buff		*skb;
+	struct macb_dma_desc	*desc;
+	dma_addr_t		addr;
+	int i;
+
+	if (!bp->rx_skbuff)
+		return;
+
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		skb = bp->rx_skbuff[i];
+
+		if (skb == NULL)
+			continue;
+
+		desc = &bp->rx_ring[i];
+		addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
+		dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
+				 DMA_FROM_DEVICE);
+		dev_kfree_skb_any(skb);
+		skb = NULL;
+	}
+
+	kfree(bp->rx_skbuff);
+	bp->rx_skbuff = NULL;
+}
+
+static void macb_free_rx_buffers(struct macb *bp)
+{
+	if (bp->rx_buffers) {
+		dma_free_coherent(&bp->pdev->dev,
+				  RX_RING_SIZE * bp->rx_buffer_size,
+				  bp->rx_buffers, bp->rx_buffers_dma);
+		bp->rx_buffers = NULL;
+	}
+}
+
+static void macb_free_consistent(struct macb *bp)
+{
+	struct macb_queue *queue;
+	unsigned int q;
+
+	bp->macbgem_ops.mog_free_rx_buffers(bp);
+	if (bp->rx_ring) {
+		dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
+				  bp->rx_ring, bp->rx_ring_dma);
+		bp->rx_ring = NULL;
+	}
+
+	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+		kfree(queue->tx_skb);
+		queue->tx_skb = NULL;
+		if (queue->tx_ring) {
+			dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
+					  queue->tx_ring, queue->tx_ring_dma);
+			queue->tx_ring = NULL;
+		}
+	}
+}
+
+static int gem_alloc_rx_buffers(struct macb *bp)
+{
+	int size;
+
+	size = RX_RING_SIZE * sizeof(struct sk_buff *);
+	bp->rx_skbuff = kzalloc(size, GFP_KERNEL);
+	if (!bp->rx_skbuff)
+		return -ENOMEM;
+	else
+		netdev_dbg(bp->dev,
+			   "Allocated %d RX struct sk_buff entries at %p\n",
+			   RX_RING_SIZE, bp->rx_skbuff);
+	return 0;
+}
+
+static int macb_alloc_rx_buffers(struct macb *bp)
+{
+	int size;
+
+	size = RX_RING_SIZE * bp->rx_buffer_size;
+	bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
+					    &bp->rx_buffers_dma, GFP_KERNEL);
+	if (!bp->rx_buffers)
+		return -ENOMEM;
+	else
+		netdev_dbg(bp->dev,
+			   "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
+			   size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
+	return 0;
+}
+
+static int macb_alloc_consistent(struct macb *bp)
+{
+	struct macb_queue *queue;
+	unsigned int q;
+	int size;
+
+	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+		size = TX_RING_BYTES;
+		queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
+						    &queue->tx_ring_dma,
+						    GFP_KERNEL);
+		if (!queue->tx_ring)
+			goto out_err;
+		netdev_dbg(bp->dev,
+			   "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
+			   q, size, (unsigned long)queue->tx_ring_dma,
+			   queue->tx_ring);
+
+		size = TX_RING_SIZE * sizeof(struct macb_tx_skb);
+		queue->tx_skb = kmalloc(size, GFP_KERNEL);
+		if (!queue->tx_skb)
+			goto out_err;
+	}
+
+	size = RX_RING_BYTES;
+	bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
+					 &bp->rx_ring_dma, GFP_KERNEL);
+	if (!bp->rx_ring)
+		goto out_err;
+	netdev_dbg(bp->dev,
+		   "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
+		   size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
+
+	if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
+		goto out_err;
+
+	return 0;
+
+out_err:
+	macb_free_consistent(bp);
+	return -ENOMEM;
+}
+
+static void gem_init_rings(struct macb *bp)
+{
+	struct macb_queue *queue;
+	unsigned int q;
+	int i;
+
+	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+		for (i = 0; i < TX_RING_SIZE; i++) {
+			queue->tx_ring[i].addr = 0;
+			queue->tx_ring[i].ctrl = MACB_BIT(TX_USED);
+		}
+		queue->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
+		queue->tx_head = 0;
+		queue->tx_tail = 0;
+	}
+
+	bp->rx_tail = 0;
+	bp->rx_prepared_head = 0;
+
+	gem_rx_refill(bp);
+}
+
+static void macb_init_rings(struct macb *bp)
+{
+	int i;
+	dma_addr_t addr;
+
+	addr = bp->rx_buffers_dma;
+	for (i = 0; i < RX_RING_SIZE; i++) {
+		bp->rx_ring[i].addr = addr;
+		bp->rx_ring[i].ctrl = 0;
+		addr += bp->rx_buffer_size;
+	}
+	bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
+
+	for (i = 0; i < TX_RING_SIZE; i++) {
+		bp->queues[0].tx_ring[i].addr = 0;
+		bp->queues[0].tx_ring[i].ctrl = MACB_BIT(TX_USED);
+	}
+	bp->queues[0].tx_head = 0;
+	bp->queues[0].tx_tail = 0;
+	bp->queues[0].tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
+
+	bp->rx_tail = 0;
+}
+
+static void macb_reset_hw(struct macb *bp)
+{
+	struct macb_queue *queue;
+	unsigned int q;
+
+	/*
+	 * Disable RX and TX (XXX: Should we halt the transmission
+	 * more gracefully?)
+	 */
+	macb_writel(bp, NCR, 0);
+
+	/* Clear the stats registers (XXX: Update stats first?) */
+	macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
+
+	/* Clear all status flags */
+	macb_writel(bp, TSR, -1);
+	macb_writel(bp, RSR, -1);
+
+	/* Disable all interrupts */
+	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+		queue_writel(queue, IDR, -1);
+		queue_readl(queue, ISR);
+	}
+}
+
+static u32 gem_mdc_clk_div(struct macb *bp)
+{
+	u32 config;
+	unsigned long pclk_hz = clk_get_rate(bp->pclk);
+
+	if (pclk_hz <= 20000000)
+		config = GEM_BF(CLK, GEM_CLK_DIV8);
+	else if (pclk_hz <= 40000000)
+		config = GEM_BF(CLK, GEM_CLK_DIV16);
+	else if (pclk_hz <= 80000000)
+		config = GEM_BF(CLK, GEM_CLK_DIV32);
+	else if (pclk_hz <= 120000000)
+		config = GEM_BF(CLK, GEM_CLK_DIV48);
+	else if (pclk_hz <= 160000000)
+		config = GEM_BF(CLK, GEM_CLK_DIV64);
+	else
+		config = GEM_BF(CLK, GEM_CLK_DIV96);
+
+	return config;
+}
+
+static u32 macb_mdc_clk_div(struct macb *bp)
+{
+	u32 config;
+	unsigned long pclk_hz;
+
+	if (macb_is_gem(bp))
+		return gem_mdc_clk_div(bp);
+
+	pclk_hz = clk_get_rate(bp->pclk);
+	if (pclk_hz <= 20000000)
+		config = MACB_BF(CLK, MACB_CLK_DIV8);
+	else if (pclk_hz <= 40000000)
+		config = MACB_BF(CLK, MACB_CLK_DIV16);
+	else if (pclk_hz <= 80000000)
+		config = MACB_BF(CLK, MACB_CLK_DIV32);
+	else
+		config = MACB_BF(CLK, MACB_CLK_DIV64);
+
+	return config;
+}
+
+/*
+ * Get the DMA bus width field of the network configuration register that we
+ * should program.  We find the width from decoding the design configuration
+ * register to find the maximum supported data bus width.
+ */
+static u32 macb_dbw(struct macb *bp)
+{
+	if (!macb_is_gem(bp))
+		return 0;
+
+	switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
+	case 4:
+		return GEM_BF(DBW, GEM_DBW128);
+	case 2:
+		return GEM_BF(DBW, GEM_DBW64);
+	case 1:
+	default:
+		return GEM_BF(DBW, GEM_DBW32);
+	}
+}
+
+/*
+ * Configure the receive DMA engine
+ * - use the correct receive buffer size
+ * - set best burst length for DMA operations
+ *   (if not supported by FIFO, it will fallback to default)
+ * - set both rx/tx packet buffers to full memory size
+ * These are configurable parameters for GEM.
+ */
+static void macb_configure_dma(struct macb *bp)
+{
+	u32 dmacfg;
+	u32 tmp, ncr;
+
+	if (macb_is_gem(bp)) {
+		dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
+		dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
+		if (bp->dma_burst_length)
+			dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
+		dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
+		dmacfg &= ~GEM_BIT(ENDIA_PKT);
+
+		/* Find the CPU endianness by using the loopback bit of net_ctrl
+		 * register. save it first. When the CPU is in big endian we
+		 * need to program swaped mode for management descriptor access.
+		 */
+		ncr = macb_readl(bp, NCR);
+		__raw_writel(MACB_BIT(LLB), bp->regs + MACB_NCR);
+		tmp =  __raw_readl(bp->regs + MACB_NCR);
+
+		if (tmp == MACB_BIT(LLB))
+			dmacfg &= ~GEM_BIT(ENDIA_DESC);
+		else
+			dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
+
+		/* Restore net_ctrl */
+		macb_writel(bp, NCR, ncr);
+
+		if (bp->dev->features & NETIF_F_HW_CSUM)
+			dmacfg |= GEM_BIT(TXCOEN);
+		else
+			dmacfg &= ~GEM_BIT(TXCOEN);
+		netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
+			   dmacfg);
+		gem_writel(bp, DMACFG, dmacfg);
+	}
+}
+
+static void macb_init_hw(struct macb *bp)
+{
+	struct macb_queue *queue;
+	unsigned int q;
+
+	u32 config;
+
+	macb_reset_hw(bp);
+	macb_set_hwaddr(bp);
+
+	config = macb_mdc_clk_div(bp);
+	config |= MACB_BF(RBOF, NET_IP_ALIGN);	/* Make eth data aligned */
+	config |= MACB_BIT(PAE);		/* PAuse Enable */
+	config |= MACB_BIT(DRFCS);		/* Discard Rx FCS */
+	config |= MACB_BIT(BIG);		/* Receive oversized frames */
+	if (bp->dev->flags & IFF_PROMISC)
+		config |= MACB_BIT(CAF);	/* Copy All Frames */
+	else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
+		config |= GEM_BIT(RXCOEN);
+	if (!(bp->dev->flags & IFF_BROADCAST))
+		config |= MACB_BIT(NBC);	/* No BroadCast */
+	config |= macb_dbw(bp);
+	macb_writel(bp, NCFGR, config);
+	bp->speed = SPEED_10;
+	bp->duplex = DUPLEX_HALF;
+
+	macb_configure_dma(bp);
+
+	/* Initialize TX and RX buffers */
+	macb_writel(bp, RBQP, bp->rx_ring_dma);
+	for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+		queue_writel(queue, TBQP, queue->tx_ring_dma);
+
+		/* Enable interrupts */
+		queue_writel(queue, IER,
+			     MACB_RX_INT_FLAGS |
+			     MACB_TX_INT_FLAGS |
+			     MACB_BIT(HRESP));
+	}
+
+	/* Enable TX and RX */
+	macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
+}
+
+/*
+ * The hash address register is 64 bits long and takes up two
+ * locations in the memory map.  The least significant bits are stored
+ * in EMAC_HSL and the most significant bits in EMAC_HSH.
+ *
+ * The unicast hash enable and the multicast hash enable bits in the
+ * network configuration register enable the reception of hash matched
+ * frames. The destination address is reduced to a 6 bit index into
+ * the 64 bit hash register using the following hash function.  The
+ * hash function is an exclusive or of every sixth bit of the
+ * destination address.
+ *
+ * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
+ * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
+ * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
+ * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
+ * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
+ * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
+ *
+ * da[0] represents the least significant bit of the first byte
+ * received, that is, the multicast/unicast indicator, and da[47]
+ * represents the most significant bit of the last byte received.  If
+ * the hash index, hi[n], points to a bit that is set in the hash
+ * register then the frame will be matched according to whether the
+ * frame is multicast or unicast.  A multicast match will be signalled
+ * if the multicast hash enable bit is set, da[0] is 1 and the hash
+ * index points to a bit set in the hash register.  A unicast match
+ * will be signalled if the unicast hash enable bit is set, da[0] is 0
+ * and the hash index points to a bit set in the hash register.  To
+ * receive all multicast frames, the hash register should be set with
+ * all ones and the multicast hash enable bit should be set in the
+ * network configuration register.
+ */
+
+static inline int hash_bit_value(int bitnr, __u8 *addr)
+{
+	if (addr[bitnr / 8] & (1 << (bitnr % 8)))
+		return 1;
+	return 0;
+}
+
+/*
+ * Return the hash index value for the specified address.
+ */
+static int hash_get_index(__u8 *addr)
+{
+	int i, j, bitval;
+	int hash_index = 0;
+
+	for (j = 0; j < 6; j++) {
+		for (i = 0, bitval = 0; i < 8; i++)
+			bitval ^= hash_bit_value(i * 6 + j, addr);
+
+		hash_index |= (bitval << j);
+	}
+
+	return hash_index;
+}
+
+/*
+ * Add multicast addresses to the internal multicast-hash table.
+ */
+static void macb_sethashtable(struct net_device *dev)
+{
+	struct netdev_hw_addr *ha;
+	unsigned long mc_filter[2];
+	unsigned int bitnr;
+	struct macb *bp = netdev_priv(dev);
+
+	mc_filter[0] = mc_filter[1] = 0;
+
+	netdev_for_each_mc_addr(ha, dev) {
+		bitnr = hash_get_index(ha->addr);
+		mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
+	}
+
+	macb_or_gem_writel(bp, HRB, mc_filter[0]);
+	macb_or_gem_writel(bp, HRT, mc_filter[1]);
+}
+
+/*
+ * Enable/Disable promiscuous and multicast modes.
+ */
+static void macb_set_rx_mode(struct net_device *dev)
+{
+	unsigned long cfg;
+	struct macb *bp = netdev_priv(dev);
+
+	cfg = macb_readl(bp, NCFGR);
+
+	if (dev->flags & IFF_PROMISC) {
+		/* Enable promiscuous mode */
+		cfg |= MACB_BIT(CAF);
+
+		/* Disable RX checksum offload */
+		if (macb_is_gem(bp))
+			cfg &= ~GEM_BIT(RXCOEN);
+	} else {
+		/* Disable promiscuous mode */
+		cfg &= ~MACB_BIT(CAF);
+
+		/* Enable RX checksum offload only if requested */
+		if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
+			cfg |= GEM_BIT(RXCOEN);
+	}
+
+	if (dev->flags & IFF_ALLMULTI) {
+		/* Enable all multicast mode */
+		macb_or_gem_writel(bp, HRB, -1);
+		macb_or_gem_writel(bp, HRT, -1);
+		cfg |= MACB_BIT(NCFGR_MTI);
+	} else if (!netdev_mc_empty(dev)) {
+		/* Enable specific multicasts */
+		macb_sethashtable(dev);
+		cfg |= MACB_BIT(NCFGR_MTI);
+	} else if (dev->flags & (~IFF_ALLMULTI)) {
+		/* Disable all multicast mode */
+		macb_or_gem_writel(bp, HRB, 0);
+		macb_or_gem_writel(bp, HRT, 0);
+		cfg &= ~MACB_BIT(NCFGR_MTI);
+	}
+
+	macb_writel(bp, NCFGR, cfg);
+}
+
+static int macb_open(struct net_device *dev)
+{
+	struct macb *bp = netdev_priv(dev);
+	size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
+	int err;
+
+	netdev_dbg(bp->dev, "open\n");
+
+	/* carrier starts down */
+	netif_carrier_off(dev);
+
+	/* if the phy is not yet register, retry later*/
+	if (!bp->phy_dev)
+		return -EAGAIN;
+
+	/* RX buffers initialization */
+	macb_init_rx_buffer_size(bp, bufsz);
+
+	err = macb_alloc_consistent(bp);
+	if (err) {
+		netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
+			   err);
+		return err;
+	}
+
+	napi_enable(&bp->napi);
+
+	bp->macbgem_ops.mog_init_rings(bp);
+	macb_init_hw(bp);
+
+	/* schedule a link state check */
+	phy_start(bp->phy_dev);
+
+	netif_tx_start_all_queues(dev);
+
+	return 0;
+}
+
+static int macb_close(struct net_device *dev)
+{
+	struct macb *bp = netdev_priv(dev);
+	unsigned long flags;
+
+	netif_tx_stop_all_queues(dev);
+	napi_disable(&bp->napi);
+
+	if (bp->phy_dev)
+		phy_stop(bp->phy_dev);
+
+	spin_lock_irqsave(&bp->lock, flags);
+	macb_reset_hw(bp);
+	netif_carrier_off(dev);
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	macb_free_consistent(bp);
+
+	return 0;
+}
+
+static void gem_update_stats(struct macb *bp)
+{
+	int i;
+	u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
+
+	for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
+		u32 offset = gem_statistics[i].offset;
+		u64 val = readl_relaxed(bp->regs + offset);
+
+		bp->ethtool_stats[i] += val;
+		*p += val;
+
+		if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
+			/* Add GEM_OCTTXH, GEM_OCTRXH */
+			val = readl_relaxed(bp->regs + offset + 4);
+			bp->ethtool_stats[i] += ((u64)val) << 32;
+			*(++p) += val;
+		}
+	}
+}
+
+static struct net_device_stats *gem_get_stats(struct macb *bp)
+{
+	struct gem_stats *hwstat = &bp->hw_stats.gem;
+	struct net_device_stats *nstat = &bp->stats;
+
+	gem_update_stats(bp);
+
+	nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
+			    hwstat->rx_alignment_errors +
+			    hwstat->rx_resource_errors +
+			    hwstat->rx_overruns +
+			    hwstat->rx_oversize_frames +
+			    hwstat->rx_jabbers +
+			    hwstat->rx_undersized_frames +
+			    hwstat->rx_length_field_frame_errors);
+	nstat->tx_errors = (hwstat->tx_late_collisions +
+			    hwstat->tx_excessive_collisions +
+			    hwstat->tx_underrun +
+			    hwstat->tx_carrier_sense_errors);
+	nstat->multicast = hwstat->rx_multicast_frames;
+	nstat->collisions = (hwstat->tx_single_collision_frames +
+			     hwstat->tx_multiple_collision_frames +
+			     hwstat->tx_excessive_collisions);
+	nstat->rx_length_errors = (hwstat->rx_oversize_frames +
+				   hwstat->rx_jabbers +
+				   hwstat->rx_undersized_frames +
+				   hwstat->rx_length_field_frame_errors);
+	nstat->rx_over_errors = hwstat->rx_resource_errors;
+	nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
+	nstat->rx_frame_errors = hwstat->rx_alignment_errors;
+	nstat->rx_fifo_errors = hwstat->rx_overruns;
+	nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
+	nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
+	nstat->tx_fifo_errors = hwstat->tx_underrun;
+
+	return nstat;
+}
+
+static void gem_get_ethtool_stats(struct net_device *dev,
+				  struct ethtool_stats *stats, u64 *data)
+{
+	struct macb *bp;
+
+	bp = netdev_priv(dev);
+	gem_update_stats(bp);
+	memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN);
+}
+
+static int gem_get_sset_count(struct net_device *dev, int sset)
+{
+	switch (sset) {
+	case ETH_SS_STATS:
+		return GEM_STATS_LEN;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
+{
+	int i;
+
+	switch (sset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
+			memcpy(p, gem_statistics[i].stat_string,
+			       ETH_GSTRING_LEN);
+		break;
+	}
+}
+
+static struct net_device_stats *macb_get_stats(struct net_device *dev)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct net_device_stats *nstat = &bp->stats;
+	struct macb_stats *hwstat = &bp->hw_stats.macb;
+
+	if (macb_is_gem(bp))
+		return gem_get_stats(bp);
+
+	/* read stats from hardware */
+	macb_update_stats(bp);
+
+	/* Convert HW stats into netdevice stats */
+	nstat->rx_errors = (hwstat->rx_fcs_errors +
+			    hwstat->rx_align_errors +
+			    hwstat->rx_resource_errors +
+			    hwstat->rx_overruns +
+			    hwstat->rx_oversize_pkts +
+			    hwstat->rx_jabbers +
+			    hwstat->rx_undersize_pkts +
+			    hwstat->rx_length_mismatch);
+	nstat->tx_errors = (hwstat->tx_late_cols +
+			    hwstat->tx_excessive_cols +
+			    hwstat->tx_underruns +
+			    hwstat->tx_carrier_errors +
+			    hwstat->sqe_test_errors);
+	nstat->collisions = (hwstat->tx_single_cols +
+			     hwstat->tx_multiple_cols +
+			     hwstat->tx_excessive_cols);
+	nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
+				   hwstat->rx_jabbers +
+				   hwstat->rx_undersize_pkts +
+				   hwstat->rx_length_mismatch);
+	nstat->rx_over_errors = hwstat->rx_resource_errors +
+				   hwstat->rx_overruns;
+	nstat->rx_crc_errors = hwstat->rx_fcs_errors;
+	nstat->rx_frame_errors = hwstat->rx_align_errors;
+	nstat->rx_fifo_errors = hwstat->rx_overruns;
+	/* XXX: What does "missed" mean? */
+	nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
+	nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
+	nstat->tx_fifo_errors = hwstat->tx_underruns;
+	/* Don't know about heartbeat or window errors... */
+
+	return nstat;
+}
+
+static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct phy_device *phydev = bp->phy_dev;
+
+	if (!phydev)
+		return -ENODEV;
+
+	return phy_ethtool_gset(phydev, cmd);
+}
+
+static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct phy_device *phydev = bp->phy_dev;
+
+	if (!phydev)
+		return -ENODEV;
+
+	return phy_ethtool_sset(phydev, cmd);
+}
+
+static int macb_get_regs_len(struct net_device *netdev)
+{
+	return MACB_GREGS_NBR * sizeof(u32);
+}
+
+static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
+			  void *p)
+{
+	struct macb *bp = netdev_priv(dev);
+	unsigned int tail, head;
+	u32 *regs_buff = p;
+
+	regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
+			| MACB_GREGS_VERSION;
+
+	tail = macb_tx_ring_wrap(bp->queues[0].tx_tail);
+	head = macb_tx_ring_wrap(bp->queues[0].tx_head);
+
+	regs_buff[0]  = macb_readl(bp, NCR);
+	regs_buff[1]  = macb_or_gem_readl(bp, NCFGR);
+	regs_buff[2]  = macb_readl(bp, NSR);
+	regs_buff[3]  = macb_readl(bp, TSR);
+	regs_buff[4]  = macb_readl(bp, RBQP);
+	regs_buff[5]  = macb_readl(bp, TBQP);
+	regs_buff[6]  = macb_readl(bp, RSR);
+	regs_buff[7]  = macb_readl(bp, IMR);
+
+	regs_buff[8]  = tail;
+	regs_buff[9]  = head;
+	regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
+	regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
+
+	regs_buff[12] = macb_or_gem_readl(bp, USRIO);
+	if (macb_is_gem(bp)) {
+		regs_buff[13] = gem_readl(bp, DMACFG);
+	}
+}
+
+static const struct ethtool_ops macb_ethtool_ops = {
+	.get_settings		= macb_get_settings,
+	.set_settings		= macb_set_settings,
+	.get_regs_len		= macb_get_regs_len,
+	.get_regs		= macb_get_regs,
+	.get_link		= ethtool_op_get_link,
+	.get_ts_info		= ethtool_op_get_ts_info,
+};
+
+static const struct ethtool_ops gem_ethtool_ops = {
+	.get_settings		= macb_get_settings,
+	.set_settings		= macb_set_settings,
+	.get_regs_len		= macb_get_regs_len,
+	.get_regs		= macb_get_regs,
+	.get_link		= ethtool_op_get_link,
+	.get_ts_info		= ethtool_op_get_ts_info,
+	.get_ethtool_stats	= gem_get_ethtool_stats,
+	.get_strings		= gem_get_ethtool_strings,
+	.get_sset_count		= gem_get_sset_count,
+};
+
+static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct macb *bp = netdev_priv(dev);
+	struct phy_device *phydev = bp->phy_dev;
+
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	if (!phydev)
+		return -ENODEV;
+
+	return phy_mii_ioctl(phydev, rq, cmd);
+}
+
+static int macb_set_features(struct net_device *netdev,
+			     netdev_features_t features)
+{
+	struct macb *bp = netdev_priv(netdev);
+	netdev_features_t changed = features ^ netdev->features;
+
+	/* TX checksum offload */
+	if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) {
+		u32 dmacfg;
+
+		dmacfg = gem_readl(bp, DMACFG);
+		if (features & NETIF_F_HW_CSUM)
+			dmacfg |= GEM_BIT(TXCOEN);
+		else
+			dmacfg &= ~GEM_BIT(TXCOEN);
+		gem_writel(bp, DMACFG, dmacfg);
+	}
+
+	/* RX checksum offload */
+	if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) {
+		u32 netcfg;
+
+		netcfg = gem_readl(bp, NCFGR);
+		if (features & NETIF_F_RXCSUM &&
+		    !(netdev->flags & IFF_PROMISC))
+			netcfg |= GEM_BIT(RXCOEN);
+		else
+			netcfg &= ~GEM_BIT(RXCOEN);
+		gem_writel(bp, NCFGR, netcfg);
+	}
+
+	return 0;
+}
+
+static const struct net_device_ops macb_netdev_ops = {
+	.ndo_open		= macb_open,
+	.ndo_stop		= macb_close,
+	.ndo_start_xmit		= macb_start_xmit,
+	.ndo_set_rx_mode	= macb_set_rx_mode,
+	.ndo_get_stats		= macb_get_stats,
+	.ndo_do_ioctl		= macb_ioctl,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_set_mac_address	= eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= macb_poll_controller,
+#endif
+	.ndo_set_features	= macb_set_features,
+};
+
+/*
+ * Configure peripheral capabilities according to device tree
+ * and integration options used
+ */
+static void macb_configure_caps(struct macb *bp, const struct macb_config *dt_conf)
+{
+	u32 dcfg;
+
+	if (dt_conf)
+		bp->caps = dt_conf->caps;
+
+	if (macb_is_gem_hw(bp->regs)) {
+		bp->caps |= MACB_CAPS_MACB_IS_GEM;
+
+		dcfg = gem_readl(bp, DCFG1);
+		if (GEM_BFEXT(IRQCOR, dcfg) == 0)
+			bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
+		dcfg = gem_readl(bp, DCFG2);
+		if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
+			bp->caps |= MACB_CAPS_FIFO_MODE;
+	}
+
+	netdev_dbg(bp->dev, "Cadence caps 0x%08x\n", bp->caps);
+}
+
+static void macb_probe_queues(void __iomem *mem,
+			      unsigned int *queue_mask,
+			      unsigned int *num_queues)
+{
+	unsigned int hw_q;
+
+	*queue_mask = 0x1;
+	*num_queues = 1;
+
+	/* is it macb or gem ?
+	 *
+	 * We need to read directly from the hardware here because
+	 * we are early in the probe process and don't have the
+	 * MACB_CAPS_MACB_IS_GEM flag positioned
+	 */
+	if (!macb_is_gem_hw(mem))
+		return;
+
+	/* bit 0 is never set but queue 0 always exists */
+	*queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff;
+
+	*queue_mask |= 0x1;
+
+	for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q)
+		if (*queue_mask & (1 << hw_q))
+			(*num_queues)++;
+}
+
+static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
+			 struct clk **hclk, struct clk **tx_clk)
+{
+	int err;
+
+	*pclk = devm_clk_get(&pdev->dev, "pclk");
+	if (IS_ERR(*pclk)) {
+		err = PTR_ERR(*pclk);
+		dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err);
+		return err;
+	}
+
+	*hclk = devm_clk_get(&pdev->dev, "hclk");
+	if (IS_ERR(*hclk)) {
+		err = PTR_ERR(*hclk);
+		dev_err(&pdev->dev, "failed to get hclk (%u)\n", err);
+		return err;
+	}
+
+	*tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
+	if (IS_ERR(*tx_clk))
+		*tx_clk = NULL;
+
+	err = clk_prepare_enable(*pclk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
+		return err;
+	}
+
+	err = clk_prepare_enable(*hclk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err);
+		goto err_disable_pclk;
+	}
+
+	err = clk_prepare_enable(*tx_clk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
+		goto err_disable_hclk;
+	}
+
+	return 0;
+
+err_disable_hclk:
+	clk_disable_unprepare(*hclk);
+
+err_disable_pclk:
+	clk_disable_unprepare(*pclk);
+
+	return err;
+}
+
+static int macb_init(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+	unsigned int hw_q, q;
+	struct macb *bp = netdev_priv(dev);
+	struct macb_queue *queue;
+	int err;
+	u32 val;
+
+	/* set the queue register mapping once for all: queue0 has a special
+	 * register mapping but we don't want to test the queue index then
+	 * compute the corresponding register offset at run time.
+	 */
+	for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
+		if (!(bp->queue_mask & (1 << hw_q)))
+			continue;
+
+		queue = &bp->queues[q];
+		queue->bp = bp;
+		if (hw_q) {
+			queue->ISR  = GEM_ISR(hw_q - 1);
+			queue->IER  = GEM_IER(hw_q - 1);
+			queue->IDR  = GEM_IDR(hw_q - 1);
+			queue->IMR  = GEM_IMR(hw_q - 1);
+			queue->TBQP = GEM_TBQP(hw_q - 1);
+		} else {
+			/* queue0 uses legacy registers */
+			queue->ISR  = MACB_ISR;
+			queue->IER  = MACB_IER;
+			queue->IDR  = MACB_IDR;
+			queue->IMR  = MACB_IMR;
+			queue->TBQP = MACB_TBQP;
+		}
+
+		/* get irq: here we use the linux queue index, not the hardware
+		 * queue index. the queue irq definitions in the device tree
+		 * must remove the optional gaps that could exist in the
+		 * hardware queue mask.
+		 */
+		queue->irq = platform_get_irq(pdev, q);
+		err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
+				       IRQF_SHARED, dev->name, queue);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Unable to request IRQ %d (error %d)\n",
+				queue->irq, err);
+			return err;
+		}
+
+		INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
+		q++;
+	}
+
+	dev->netdev_ops = &macb_netdev_ops;
+	netif_napi_add(dev, &bp->napi, macb_poll, 64);
+
+	/* setup appropriated routines according to adapter type */
+	if (macb_is_gem(bp)) {
+		bp->max_tx_length = GEM_MAX_TX_LEN;
+		bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
+		bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
+		bp->macbgem_ops.mog_init_rings = gem_init_rings;
+		bp->macbgem_ops.mog_rx = gem_rx;
+		dev->ethtool_ops = &gem_ethtool_ops;
+	} else {
+		bp->max_tx_length = MACB_MAX_TX_LEN;
+		bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
+		bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
+		bp->macbgem_ops.mog_init_rings = macb_init_rings;
+		bp->macbgem_ops.mog_rx = macb_rx;
+		dev->ethtool_ops = &macb_ethtool_ops;
+	}
+
+	/* Set features */
+	dev->hw_features = NETIF_F_SG;
+	/* Checksum offload is only available on gem with packet buffer */
+	if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
+		dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+	if (bp->caps & MACB_CAPS_SG_DISABLED)
+		dev->hw_features &= ~NETIF_F_SG;
+	dev->features = dev->hw_features;
+
+	val = 0;
+	if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
+		val = GEM_BIT(RGMII);
+	else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
+		 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
+		val = MACB_BIT(RMII);
+	else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
+		val = MACB_BIT(MII);
+
+	if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
+		val |= MACB_BIT(CLKEN);
+
+	macb_or_gem_writel(bp, USRIO, val);
+
+	/* Set MII management clock divider */
+	val = macb_mdc_clk_div(bp);
+	val |= macb_dbw(bp);
+	macb_writel(bp, NCFGR, val);
+
+	return 0;
+}
+
+#if defined(CONFIG_OF)
+/* 1518 rounded up */
+#define AT91ETHER_MAX_RBUFF_SZ	0x600
+/* max number of receive buffers */
+#define AT91ETHER_MAX_RX_DESCR	9
+
+/* Initialize and start the Receiver and Transmit subsystems */
+static int at91ether_start(struct net_device *dev)
+{
+	struct macb *lp = netdev_priv(dev);
+	dma_addr_t addr;
+	u32 ctl;
+	int i;
+
+	lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
+					 (AT91ETHER_MAX_RX_DESCR *
+					  sizeof(struct macb_dma_desc)),
+					 &lp->rx_ring_dma, GFP_KERNEL);
+	if (!lp->rx_ring)
+		return -ENOMEM;
+
+	lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
+					    AT91ETHER_MAX_RX_DESCR *
+					    AT91ETHER_MAX_RBUFF_SZ,
+					    &lp->rx_buffers_dma, GFP_KERNEL);
+	if (!lp->rx_buffers) {
+		dma_free_coherent(&lp->pdev->dev,
+				  AT91ETHER_MAX_RX_DESCR *
+				  sizeof(struct macb_dma_desc),
+				  lp->rx_ring, lp->rx_ring_dma);
+		lp->rx_ring = NULL;
+		return -ENOMEM;
+	}
+
+	addr = lp->rx_buffers_dma;
+	for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
+		lp->rx_ring[i].addr = addr;
+		lp->rx_ring[i].ctrl = 0;
+		addr += AT91ETHER_MAX_RBUFF_SZ;
+	}
+
+	/* Set the Wrap bit on the last descriptor */
+	lp->rx_ring[AT91ETHER_MAX_RX_DESCR - 1].addr |= MACB_BIT(RX_WRAP);
+
+	/* Reset buffer index */
+	lp->rx_tail = 0;
+
+	/* Program address of descriptor list in Rx Buffer Queue register */
+	macb_writel(lp, RBQP, lp->rx_ring_dma);
+
+	/* Enable Receive and Transmit */
+	ctl = macb_readl(lp, NCR);
+	macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
+
+	return 0;
+}
+
+/* Open the ethernet interface */
+static int at91ether_open(struct net_device *dev)
+{
+	struct macb *lp = netdev_priv(dev);
+	u32 ctl;
+	int ret;
+
+	/* Clear internal statistics */
+	ctl = macb_readl(lp, NCR);
+	macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
+
+	macb_set_hwaddr(lp);
+
+	ret = at91ether_start(dev);
+	if (ret)
+		return ret;
+
+	/* Enable MAC interrupts */
+	macb_writel(lp, IER, MACB_BIT(RCOMP)	|
+			     MACB_BIT(RXUBR)	|
+			     MACB_BIT(ISR_TUND)	|
+			     MACB_BIT(ISR_RLE)	|
+			     MACB_BIT(TCOMP)	|
+			     MACB_BIT(ISR_ROVR)	|
+			     MACB_BIT(HRESP));
+
+	/* schedule a link state check */
+	phy_start(lp->phy_dev);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/* Close the interface */
+static int at91ether_close(struct net_device *dev)
+{
+	struct macb *lp = netdev_priv(dev);
+	u32 ctl;
+
+	/* Disable Receiver and Transmitter */
+	ctl = macb_readl(lp, NCR);
+	macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
+
+	/* Disable MAC interrupts */
+	macb_writel(lp, IDR, MACB_BIT(RCOMP)	|
+			     MACB_BIT(RXUBR)	|
+			     MACB_BIT(ISR_TUND)	|
+			     MACB_BIT(ISR_RLE)	|
+			     MACB_BIT(TCOMP)	|
+			     MACB_BIT(ISR_ROVR) |
+			     MACB_BIT(HRESP));
+
+	netif_stop_queue(dev);
+
+	dma_free_coherent(&lp->pdev->dev,
+			  AT91ETHER_MAX_RX_DESCR *
+			  sizeof(struct macb_dma_desc),
+			  lp->rx_ring, lp->rx_ring_dma);
+	lp->rx_ring = NULL;
+
+	dma_free_coherent(&lp->pdev->dev,
+			  AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ,
+			  lp->rx_buffers, lp->rx_buffers_dma);
+	lp->rx_buffers = NULL;
+
+	return 0;
+}
+
+/* Transmit packet */
+static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct macb *lp = netdev_priv(dev);
+
+	if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
+		netif_stop_queue(dev);
+
+		/* Store packet information (to free when Tx completed) */
+		lp->skb = skb;
+		lp->skb_length = skb->len;
+		lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len,
+							DMA_TO_DEVICE);
+
+		/* Set address of the data in the Transmit Address register */
+		macb_writel(lp, TAR, lp->skb_physaddr);
+		/* Set length of the packet in the Transmit Control register */
+		macb_writel(lp, TCR, skb->len);
+
+	} else {
+		netdev_err(dev, "%s called, but device is busy!\n", __func__);
+		return NETDEV_TX_BUSY;
+	}
+
+	return NETDEV_TX_OK;
+}
+
+/* Extract received frame from buffer descriptors and sent to upper layers.
+ * (Called from interrupt context)
+ */
+static void at91ether_rx(struct net_device *dev)
+{
+	struct macb *lp = netdev_priv(dev);
+	unsigned char *p_recv;
+	struct sk_buff *skb;
+	unsigned int pktlen;
+
+	while (lp->rx_ring[lp->rx_tail].addr & MACB_BIT(RX_USED)) {
+		p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
+		pktlen = MACB_BF(RX_FRMLEN, lp->rx_ring[lp->rx_tail].ctrl);
+		skb = netdev_alloc_skb(dev, pktlen + 2);
+		if (skb) {
+			skb_reserve(skb, 2);
+			memcpy(skb_put(skb, pktlen), p_recv, pktlen);
+
+			skb->protocol = eth_type_trans(skb, dev);
+			lp->stats.rx_packets++;
+			lp->stats.rx_bytes += pktlen;
+			netif_rx(skb);
+		} else {
+			lp->stats.rx_dropped++;
+		}
+
+		if (lp->rx_ring[lp->rx_tail].ctrl & MACB_BIT(RX_MHASH_MATCH))
+			lp->stats.multicast++;
+
+		/* reset ownership bit */
+		lp->rx_ring[lp->rx_tail].addr &= ~MACB_BIT(RX_USED);
+
+		/* wrap after last buffer */
+		if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
+			lp->rx_tail = 0;
+		else
+			lp->rx_tail++;
+	}
+}
+
+/* MAC interrupt handler */
+static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct macb *lp = netdev_priv(dev);
+	u32 intstatus, ctl;
+
+	/* MAC Interrupt Status register indicates what interrupts are pending.
+	 * It is automatically cleared once read.
+	 */
+	intstatus = macb_readl(lp, ISR);
+
+	/* Receive complete */
+	if (intstatus & MACB_BIT(RCOMP))
+		at91ether_rx(dev);
+
+	/* Transmit complete */
+	if (intstatus & MACB_BIT(TCOMP)) {
+		/* The TCOM bit is set even if the transmission failed */
+		if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
+			lp->stats.tx_errors++;
+
+		if (lp->skb) {
+			dev_kfree_skb_irq(lp->skb);
+			lp->skb = NULL;
+			dma_unmap_single(NULL, lp->skb_physaddr,
+					 lp->skb_length, DMA_TO_DEVICE);
+			lp->stats.tx_packets++;
+			lp->stats.tx_bytes += lp->skb_length;
+		}
+		netif_wake_queue(dev);
+	}
+
+	/* Work-around for EMAC Errata section 41.3.1 */
+	if (intstatus & MACB_BIT(RXUBR)) {
+		ctl = macb_readl(lp, NCR);
+		macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
+		macb_writel(lp, NCR, ctl | MACB_BIT(RE));
+	}
+
+	if (intstatus & MACB_BIT(ISR_ROVR))
+		netdev_err(dev, "ROVR error\n");
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void at91ether_poll_controller(struct net_device *dev)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	at91ether_interrupt(dev->irq, dev);
+	local_irq_restore(flags);
+}
+#endif
+
+static const struct net_device_ops at91ether_netdev_ops = {
+	.ndo_open		= at91ether_open,
+	.ndo_stop		= at91ether_close,
+	.ndo_start_xmit		= at91ether_start_xmit,
+	.ndo_get_stats		= macb_get_stats,
+	.ndo_set_rx_mode	= macb_set_rx_mode,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_do_ioctl		= macb_ioctl,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_change_mtu		= eth_change_mtu,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= at91ether_poll_controller,
+#endif
+};
+
+static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
+			      struct clk **hclk, struct clk **tx_clk)
+{
+	int err;
+
+	*hclk = NULL;
+	*tx_clk = NULL;
+
+	*pclk = devm_clk_get(&pdev->dev, "ether_clk");
+	if (IS_ERR(*pclk))
+		return PTR_ERR(*pclk);
+
+	err = clk_prepare_enable(*pclk);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int at91ether_init(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+	struct macb *bp = netdev_priv(dev);
+	int err;
+	u32 reg;
+
+	dev->netdev_ops = &at91ether_netdev_ops;
+	dev->ethtool_ops = &macb_ethtool_ops;
+
+	err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
+			       0, dev->name, dev);
+	if (err)
+		return err;
+
+	macb_writel(bp, NCR, 0);
+
+	reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG);
+	if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
+		reg |= MACB_BIT(RM9200_RMII);
+
+	macb_writel(bp, NCFGR, reg);
+
+	return 0;
+}
+
+static const struct macb_config at91sam9260_config = {
+	.caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII,
+	.clk_init = macb_clk_init,
+	.init = macb_init,
+};
+
+static const struct macb_config pc302gem_config = {
+	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
+	.dma_burst_length = 16,
+	.clk_init = macb_clk_init,
+	.init = macb_init,
+};
+
+static const struct macb_config sama5d3_config = {
+	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
+	.dma_burst_length = 16,
+	.clk_init = macb_clk_init,
+	.init = macb_init,
+};
+
+static const struct macb_config sama5d4_config = {
+	.caps = 0,
+	.dma_burst_length = 4,
+	.clk_init = macb_clk_init,
+	.init = macb_init,
+};
+
+static const struct macb_config emac_config = {
+	.clk_init = at91ether_clk_init,
+	.init = at91ether_init,
+};
+
+static const struct macb_config zynq_config = {
+	.caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE |
+		MACB_CAPS_NO_GIGABIT_HALF,
+	.dma_burst_length = 16,
+	.clk_init = macb_clk_init,
+	.init = macb_init,
+};
+
+static const struct of_device_id macb_dt_ids[] = {
+	{ .compatible = "cdns,at32ap7000-macb" },
+	{ .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
+	{ .compatible = "cdns,macb" },
+	{ .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
+	{ .compatible = "cdns,gem", .data = &pc302gem_config },
+	{ .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
+	{ .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
+	{ .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
+	{ .compatible = "cdns,emac", .data = &emac_config },
+	{ .compatible = "cdns,zynq-gem", .data = &zynq_config },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, macb_dt_ids);
+#endif /* CONFIG_OF */
+
+static int macb_probe(struct platform_device *pdev)
+{
+	int (*clk_init)(struct platform_device *, struct clk **,
+			struct clk **, struct clk **)
+					      = macb_clk_init;
+	int (*init)(struct platform_device *) = macb_init;
+	struct device_node *np = pdev->dev.of_node;
+	const struct macb_config *macb_config = NULL;
+	struct clk *pclk, *hclk, *tx_clk;
+	unsigned int queue_mask, num_queues;
+	struct macb_platform_data *pdata;
+	struct phy_device *phydev;
+	struct net_device *dev;
+	struct resource *regs;
+	void __iomem *mem;
+	const char *mac;
+	struct macb *bp;
+	int err;
+
+	if (np) {
+		const struct of_device_id *match;
+
+		match = of_match_node(macb_dt_ids, np);
+		if (match && match->data) {
+			macb_config = match->data;
+			clk_init = macb_config->clk_init;
+			init = macb_config->init;
+		}
+	}
+
+	err = clk_init(pdev, &pclk, &hclk, &tx_clk);
+	if (err)
+		return err;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = devm_ioremap_resource(&pdev->dev, regs);
+	if (IS_ERR(mem)) {
+		err = PTR_ERR(mem);
+		goto err_disable_clocks;
+	}
+
+	macb_probe_queues(mem, &queue_mask, &num_queues);
+	dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
+	if (!dev) {
+		err = -ENOMEM;
+		goto err_disable_clocks;
+	}
+
+	dev->base_addr = regs->start;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	bp = netdev_priv(dev);
+	bp->pdev = pdev;
+	bp->dev = dev;
+	bp->regs = mem;
+	bp->num_queues = num_queues;
+	bp->queue_mask = queue_mask;
+	if (macb_config)
+		bp->dma_burst_length = macb_config->dma_burst_length;
+	bp->pclk = pclk;
+	bp->hclk = hclk;
+	bp->tx_clk = tx_clk;
+	spin_lock_init(&bp->lock);
+
+	/* setup capabilities */
+	macb_configure_caps(bp, macb_config);
+
+	platform_set_drvdata(pdev, dev);
+
+	dev->irq = platform_get_irq(pdev, 0);
+	if (dev->irq < 0) {
+		err = dev->irq;
+		goto err_disable_clocks;
+	}
+
+	mac = of_get_mac_address(np);
+	if (mac)
+		memcpy(bp->dev->dev_addr, mac, ETH_ALEN);
+	else
+		macb_get_hwaddr(bp);
+
+	err = of_get_phy_mode(np);
+	if (err < 0) {
+		pdata = dev_get_platdata(&pdev->dev);
+		if (pdata && pdata->is_rmii)
+			bp->phy_interface = PHY_INTERFACE_MODE_RMII;
+		else
+			bp->phy_interface = PHY_INTERFACE_MODE_MII;
+	} else {
+		bp->phy_interface = err;
+	}
+
+	/* IP specific init */
+	err = init(pdev);
+	if (err)
+		goto err_out_free_netdev;
+
+	err = register_netdev(dev);
+	if (err) {
+		dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
+		goto err_out_unregister_netdev;
+	}
+
+	err = macb_mii_init(bp);
+	if (err)
+		goto err_out_unregister_netdev;
+
+	netif_carrier_off(dev);
+
+	netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
+		    macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
+		    dev->base_addr, dev->irq, dev->dev_addr);
+
+	phydev = bp->phy_dev;
+	netdev_info(dev, "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
+		    phydev->drv->name, dev_name(&phydev->dev), phydev->irq);
+
+	return 0;
+
+err_out_unregister_netdev:
+	unregister_netdev(dev);
+
+err_out_free_netdev:
+	free_netdev(dev);
+
+err_disable_clocks:
+	clk_disable_unprepare(tx_clk);
+	clk_disable_unprepare(hclk);
+	clk_disable_unprepare(pclk);
+
+	return err;
+}
+
+static int macb_remove(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct macb *bp;
+
+	dev = platform_get_drvdata(pdev);
+
+	if (dev) {
+		bp = netdev_priv(dev);
+		if (bp->phy_dev)
+			phy_disconnect(bp->phy_dev);
+		mdiobus_unregister(bp->mii_bus);
+		kfree(bp->mii_bus->irq);
+		mdiobus_free(bp->mii_bus);
+		unregister_netdev(dev);
+		clk_disable_unprepare(bp->tx_clk);
+		clk_disable_unprepare(bp->hclk);
+		clk_disable_unprepare(bp->pclk);
+		free_netdev(dev);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused macb_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct net_device *netdev = platform_get_drvdata(pdev);
+	struct macb *bp = netdev_priv(netdev);
+
+	netif_carrier_off(netdev);
+	netif_device_detach(netdev);
+
+	clk_disable_unprepare(bp->tx_clk);
+	clk_disable_unprepare(bp->hclk);
+	clk_disable_unprepare(bp->pclk);
+
+	return 0;
+}
+
+static int __maybe_unused macb_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct net_device *netdev = platform_get_drvdata(pdev);
+	struct macb *bp = netdev_priv(netdev);
+
+	clk_prepare_enable(bp->pclk);
+	clk_prepare_enable(bp->hclk);
+	clk_prepare_enable(bp->tx_clk);
+
+	netif_device_attach(netdev);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
+
+static struct platform_driver macb_driver = {
+	.probe		= macb_probe,
+	.remove		= macb_remove,
+	.driver		= {
+		.name		= "macb",
+		.of_match_table	= of_match_ptr(macb_dt_ids),
+		.pm	= &macb_pm_ops,
+	},
+};
+
+module_platform_driver(macb_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
+MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
+MODULE_ALIAS("platform:macb");