Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 3648 insertions, 0 deletions

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
new file mode 100644
index 000000000..b2def2955
--- /dev/null
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -0,0 +1,3648 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* drivers/net/ethernet/freescale/gianfar.c
+ *
+ * Gianfar Ethernet Driver
+ * This driver is designed for the non-CPM ethernet controllers
+ * on the 85xx and 83xx family of integrated processors
+ * Based on 8260_io/fcc_enet.c
+ *
+ * Author: Andy Fleming
+ * Maintainer: Kumar Gala
+ * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
+ *
+ * Copyright 2002-2009, 2011-2013 Freescale Semiconductor, Inc.
+ * Copyright 2007 MontaVista Software, Inc.
+ *
+ *  Gianfar:  AKA Lambda Draconis, "Dragon"
+ *  RA 11 31 24.2
+ *  Dec +69 19 52
+ *  V 3.84
+ *  B-V +1.62
+ *
+ *  Theory of operation
+ *
+ *  The driver is initialized through of_device. Configuration information
+ *  is therefore conveyed through an OF-style device tree.
+ *
+ *  The Gianfar Ethernet Controller uses a ring of buffer
+ *  descriptors.  The beginning is indicated by a register
+ *  pointing to the physical address of the start of the ring.
+ *  The end is determined by a "wrap" bit being set in the
+ *  last descriptor of the ring.
+ *
+ *  When a packet is received, the RXF bit in the
+ *  IEVENT register is set, triggering an interrupt when the
+ *  corresponding bit in the IMASK register is also set (if
+ *  interrupt coalescing is active, then the interrupt may not
+ *  happen immediately, but will wait until either a set number
+ *  of frames or amount of time have passed).  In NAPI, the
+ *  interrupt handler will signal there is work to be done, and
+ *  exit. This method will start at the last known empty
+ *  descriptor, and process every subsequent descriptor until there
+ *  are none left with data (NAPI will stop after a set number of
+ *  packets to give time to other tasks, but will eventually
+ *  process all the packets).  The data arrives inside a
+ *  pre-allocated skb, and so after the skb is passed up to the
+ *  stack, a new skb must be allocated, and the address field in
+ *  the buffer descriptor must be updated to indicate this new
+ *  skb.
+ *
+ *  When the kernel requests that a packet be transmitted, the
+ *  driver starts where it left off last time, and points the
+ *  descriptor at the buffer which was passed in.  The driver
+ *  then informs the DMA engine that there are packets ready to
+ *  be transmitted.  Once the controller is finished transmitting
+ *  the packet, an interrupt may be triggered (under the same
+ *  conditions as for reception, but depending on the TXF bit).
+ *  The driver then cleans up the buffer.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_vlan.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/net_tstamp.h>
+
+#include <asm/io.h>
+#ifdef CONFIG_PPC
+#include <asm/reg.h>
+#include <asm/mpc85xx.h>
+#endif
+#include <asm/irq.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/phy_fixed.h>
+#include <linux/of.h>
+#include <linux/of_net.h>
+
+#include "gianfar.h"
+
+#define TX_TIMEOUT      (5*HZ)
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc");
+MODULE_DESCRIPTION("Gianfar Ethernet Driver");
+MODULE_LICENSE("GPL");
+
+static void gfar_init_rxbdp(struct gfar_priv_rx_q *rx_queue, struct rxbd8 *bdp,
+			    dma_addr_t buf)
+{
+	u32 lstatus;
+
+	bdp->bufPtr = cpu_to_be32(buf);
+
+	lstatus = BD_LFLAG(RXBD_EMPTY | RXBD_INTERRUPT);
+	if (bdp == rx_queue->rx_bd_base + rx_queue->rx_ring_size - 1)
+		lstatus |= BD_LFLAG(RXBD_WRAP);
+
+	gfar_wmb();
+
+	bdp->lstatus = cpu_to_be32(lstatus);
+}
+
+static void gfar_init_tx_rx_base(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 __iomem *baddr;
+	int i;
+
+	baddr = &regs->tbase0;
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		gfar_write(baddr, priv->tx_queue[i]->tx_bd_dma_base);
+		baddr += 2;
+	}
+
+	baddr = &regs->rbase0;
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		gfar_write(baddr, priv->rx_queue[i]->rx_bd_dma_base);
+		baddr += 2;
+	}
+}
+
+static void gfar_init_rqprm(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 __iomem *baddr;
+	int i;
+
+	baddr = &regs->rqprm0;
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		gfar_write(baddr, priv->rx_queue[i]->rx_ring_size |
+			   (DEFAULT_RX_LFC_THR << FBTHR_SHIFT));
+		baddr++;
+	}
+}
+
+static void gfar_rx_offload_en(struct gfar_private *priv)
+{
+	/* set this when rx hw offload (TOE) functions are being used */
+	priv->uses_rxfcb = 0;
+
+	if (priv->ndev->features & (NETIF_F_RXCSUM | NETIF_F_HW_VLAN_CTAG_RX))
+		priv->uses_rxfcb = 1;
+
+	if (priv->hwts_rx_en || priv->rx_filer_enable)
+		priv->uses_rxfcb = 1;
+}
+
+static void gfar_mac_rx_config(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 rctrl = 0;
+
+	if (priv->rx_filer_enable) {
+		rctrl |= RCTRL_FILREN | RCTRL_PRSDEP_INIT;
+		/* Program the RIR0 reg with the required distribution */
+		gfar_write(&regs->rir0, DEFAULT_2RXQ_RIR0);
+	}
+
+	/* Restore PROMISC mode */
+	if (priv->ndev->flags & IFF_PROMISC)
+		rctrl |= RCTRL_PROM;
+
+	if (priv->ndev->features & NETIF_F_RXCSUM)
+		rctrl |= RCTRL_CHECKSUMMING;
+
+	if (priv->extended_hash)
+		rctrl |= RCTRL_EXTHASH | RCTRL_EMEN;
+
+	if (priv->padding) {
+		rctrl &= ~RCTRL_PAL_MASK;
+		rctrl |= RCTRL_PADDING(priv->padding);
+	}
+
+	/* Enable HW time stamping if requested from user space */
+	if (priv->hwts_rx_en)
+		rctrl |= RCTRL_PRSDEP_INIT | RCTRL_TS_ENABLE;
+
+	if (priv->ndev->features & NETIF_F_HW_VLAN_CTAG_RX)
+		rctrl |= RCTRL_VLEX | RCTRL_PRSDEP_INIT;
+
+	/* Clear the LFC bit */
+	gfar_write(&regs->rctrl, rctrl);
+	/* Init flow control threshold values */
+	gfar_init_rqprm(priv);
+	gfar_write(&regs->ptv, DEFAULT_LFC_PTVVAL);
+	rctrl |= RCTRL_LFC;
+
+	/* Init rctrl based on our settings */
+	gfar_write(&regs->rctrl, rctrl);
+}
+
+static void gfar_mac_tx_config(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tctrl = 0;
+
+	if (priv->ndev->features & NETIF_F_IP_CSUM)
+		tctrl |= TCTRL_INIT_CSUM;
+
+	if (priv->prio_sched_en)
+		tctrl |= TCTRL_TXSCHED_PRIO;
+	else {
+		tctrl |= TCTRL_TXSCHED_WRRS;
+		gfar_write(&regs->tr03wt, DEFAULT_WRRS_WEIGHT);
+		gfar_write(&regs->tr47wt, DEFAULT_WRRS_WEIGHT);
+	}
+
+	if (priv->ndev->features & NETIF_F_HW_VLAN_CTAG_TX)
+		tctrl |= TCTRL_VLINS;
+
+	gfar_write(&regs->tctrl, tctrl);
+}
+
+static void gfar_configure_coalescing(struct gfar_private *priv,
+			       unsigned long tx_mask, unsigned long rx_mask)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 __iomem *baddr;
+
+	if (priv->mode == MQ_MG_MODE) {
+		int i = 0;
+
+		baddr = &regs->txic0;
+		for_each_set_bit(i, &tx_mask, priv->num_tx_queues) {
+			gfar_write(baddr + i, 0);
+			if (likely(priv->tx_queue[i]->txcoalescing))
+				gfar_write(baddr + i, priv->tx_queue[i]->txic);
+		}
+
+		baddr = &regs->rxic0;
+		for_each_set_bit(i, &rx_mask, priv->num_rx_queues) {
+			gfar_write(baddr + i, 0);
+			if (likely(priv->rx_queue[i]->rxcoalescing))
+				gfar_write(baddr + i, priv->rx_queue[i]->rxic);
+		}
+	} else {
+		/* Backward compatible case -- even if we enable
+		 * multiple queues, there's only single reg to program
+		 */
+		gfar_write(&regs->txic, 0);
+		if (likely(priv->tx_queue[0]->txcoalescing))
+			gfar_write(&regs->txic, priv->tx_queue[0]->txic);
+
+		gfar_write(&regs->rxic, 0);
+		if (unlikely(priv->rx_queue[0]->rxcoalescing))
+			gfar_write(&regs->rxic, priv->rx_queue[0]->rxic);
+	}
+}
+
+static void gfar_configure_coalescing_all(struct gfar_private *priv)
+{
+	gfar_configure_coalescing(priv, 0xFF, 0xFF);
+}
+
+static void gfar_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	int i;
+
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		stats->rx_packets += priv->rx_queue[i]->stats.rx_packets;
+		stats->rx_bytes   += priv->rx_queue[i]->stats.rx_bytes;
+		stats->rx_dropped += priv->rx_queue[i]->stats.rx_dropped;
+	}
+
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		stats->tx_bytes += priv->tx_queue[i]->stats.tx_bytes;
+		stats->tx_packets += priv->tx_queue[i]->stats.tx_packets;
+	}
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
+		struct rmon_mib __iomem *rmon = &priv->gfargrp[0].regs->rmon;
+		unsigned long flags;
+		u32 rdrp, car, car_before;
+		u64 rdrp_offset;
+
+		spin_lock_irqsave(&priv->rmon_overflow.lock, flags);
+		car = gfar_read(&rmon->car1) & CAR1_C1RDR;
+		do {
+			car_before = car;
+			rdrp = gfar_read(&rmon->rdrp);
+			car = gfar_read(&rmon->car1) & CAR1_C1RDR;
+		} while (car != car_before);
+		if (car) {
+			priv->rmon_overflow.rdrp++;
+			gfar_write(&rmon->car1, car);
+		}
+		rdrp_offset = priv->rmon_overflow.rdrp;
+		spin_unlock_irqrestore(&priv->rmon_overflow.lock, flags);
+
+		stats->rx_missed_errors = rdrp + (rdrp_offset << 16);
+	}
+}
+
+/* Set the appropriate hash bit for the given addr */
+/* The algorithm works like so:
+ * 1) Take the Destination Address (ie the multicast address), and
+ * do a CRC on it (little endian), and reverse the bits of the
+ * result.
+ * 2) Use the 8 most significant bits as a hash into a 256-entry
+ * table.  The table is controlled through 8 32-bit registers:
+ * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
+ * gaddr7.  This means that the 3 most significant bits in the
+ * hash index which gaddr register to use, and the 5 other bits
+ * indicate which bit (assuming an IBM numbering scheme, which
+ * for PowerPC (tm) is usually the case) in the register holds
+ * the entry.
+ */
+static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
+{
+	u32 tempval;
+	struct gfar_private *priv = netdev_priv(dev);
+	u32 result = ether_crc(ETH_ALEN, addr);
+	int width = priv->hash_width;
+	u8 whichbit = (result >> (32 - width)) & 0x1f;
+	u8 whichreg = result >> (32 - width + 5);
+	u32 value = (1 << (31-whichbit));
+
+	tempval = gfar_read(priv->hash_regs[whichreg]);
+	tempval |= value;
+	gfar_write(priv->hash_regs[whichreg], tempval);
+}
+
+/* There are multiple MAC Address register pairs on some controllers
+ * This function sets the numth pair to a given address
+ */
+static void gfar_set_mac_for_addr(struct net_device *dev, int num,
+				  const u8 *addr)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	u32 __iomem *macptr = &regs->macstnaddr1;
+
+	macptr += num*2;
+
+	/* For a station address of 0x12345678ABCD in transmission
+	 * order (BE), MACnADDR1 is set to 0xCDAB7856 and
+	 * MACnADDR2 is set to 0x34120000.
+	 */
+	tempval = (addr[5] << 24) | (addr[4] << 16) |
+		  (addr[3] << 8)  |  addr[2];
+
+	gfar_write(macptr, tempval);
+
+	tempval = (addr[1] << 24) | (addr[0] << 16);
+
+	gfar_write(macptr+1, tempval);
+}
+
+static int gfar_set_mac_addr(struct net_device *dev, void *p)
+{
+	int ret;
+
+	ret = eth_mac_addr(dev, p);
+	if (ret)
+		return ret;
+
+	gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
+
+	return 0;
+}
+
+static void gfar_ints_disable(struct gfar_private *priv)
+{
+	int i;
+	for (i = 0; i < priv->num_grps; i++) {
+		struct gfar __iomem *regs = priv->gfargrp[i].regs;
+		/* Clear IEVENT */
+		gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
+
+		/* Initialize IMASK */
+		gfar_write(&regs->imask, IMASK_INIT_CLEAR);
+	}
+}
+
+static void gfar_ints_enable(struct gfar_private *priv)
+{
+	int i;
+	for (i = 0; i < priv->num_grps; i++) {
+		struct gfar __iomem *regs = priv->gfargrp[i].regs;
+		/* Unmask the interrupts we look for */
+		gfar_write(&regs->imask,
+			   IMASK_DEFAULT | priv->rmon_overflow.imask);
+	}
+}
+
+static int gfar_alloc_tx_queues(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		priv->tx_queue[i] = kzalloc(sizeof(struct gfar_priv_tx_q),
+					    GFP_KERNEL);
+		if (!priv->tx_queue[i])
+			return -ENOMEM;
+
+		priv->tx_queue[i]->tx_skbuff = NULL;
+		priv->tx_queue[i]->qindex = i;
+		priv->tx_queue[i]->dev = priv->ndev;
+		spin_lock_init(&(priv->tx_queue[i]->txlock));
+	}
+	return 0;
+}
+
+static int gfar_alloc_rx_queues(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		priv->rx_queue[i] = kzalloc(sizeof(struct gfar_priv_rx_q),
+					    GFP_KERNEL);
+		if (!priv->rx_queue[i])
+			return -ENOMEM;
+
+		priv->rx_queue[i]->qindex = i;
+		priv->rx_queue[i]->ndev = priv->ndev;
+	}
+	return 0;
+}
+
+static void gfar_free_tx_queues(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->num_tx_queues; i++)
+		kfree(priv->tx_queue[i]);
+}
+
+static void gfar_free_rx_queues(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->num_rx_queues; i++)
+		kfree(priv->rx_queue[i]);
+}
+
+static void unmap_group_regs(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < MAXGROUPS; i++)
+		if (priv->gfargrp[i].regs)
+			iounmap(priv->gfargrp[i].regs);
+}
+
+static void free_gfar_dev(struct gfar_private *priv)
+{
+	int i, j;
+
+	for (i = 0; i < priv->num_grps; i++)
+		for (j = 0; j < GFAR_NUM_IRQS; j++) {
+			kfree(priv->gfargrp[i].irqinfo[j]);
+			priv->gfargrp[i].irqinfo[j] = NULL;
+		}
+
+	free_netdev(priv->ndev);
+}
+
+static void disable_napi(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->num_grps; i++) {
+		napi_disable(&priv->gfargrp[i].napi_rx);
+		napi_disable(&priv->gfargrp[i].napi_tx);
+	}
+}
+
+static void enable_napi(struct gfar_private *priv)
+{
+	int i;
+
+	for (i = 0; i < priv->num_grps; i++) {
+		napi_enable(&priv->gfargrp[i].napi_rx);
+		napi_enable(&priv->gfargrp[i].napi_tx);
+	}
+}
+
+static int gfar_parse_group(struct device_node *np,
+			    struct gfar_private *priv, const char *model)
+{
+	struct gfar_priv_grp *grp = &priv->gfargrp[priv->num_grps];
+	int i;
+
+	for (i = 0; i < GFAR_NUM_IRQS; i++) {
+		grp->irqinfo[i] = kzalloc(sizeof(struct gfar_irqinfo),
+					  GFP_KERNEL);
+		if (!grp->irqinfo[i])
+			return -ENOMEM;
+	}
+
+	grp->regs = of_iomap(np, 0);
+	if (!grp->regs)
+		return -ENOMEM;
+
+	gfar_irq(grp, TX)->irq = irq_of_parse_and_map(np, 0);
+
+	/* If we aren't the FEC we have multiple interrupts */
+	if (model && strcasecmp(model, "FEC")) {
+		gfar_irq(grp, RX)->irq = irq_of_parse_and_map(np, 1);
+		gfar_irq(grp, ER)->irq = irq_of_parse_and_map(np, 2);
+		if (!gfar_irq(grp, TX)->irq ||
+		    !gfar_irq(grp, RX)->irq ||
+		    !gfar_irq(grp, ER)->irq)
+			return -EINVAL;
+	}
+
+	grp->priv = priv;
+	spin_lock_init(&grp->grplock);
+	if (priv->mode == MQ_MG_MODE) {
+		/* One Q per interrupt group: Q0 to G0, Q1 to G1 */
+		grp->rx_bit_map = (DEFAULT_MAPPING >> priv->num_grps);
+		grp->tx_bit_map = (DEFAULT_MAPPING >> priv->num_grps);
+	} else {
+		grp->rx_bit_map = 0xFF;
+		grp->tx_bit_map = 0xFF;
+	}
+
+	/* bit_map's MSB is q0 (from q0 to q7) but, for_each_set_bit parses
+	 * right to left, so we need to revert the 8 bits to get the q index
+	 */
+	grp->rx_bit_map = bitrev8(grp->rx_bit_map);
+	grp->tx_bit_map = bitrev8(grp->tx_bit_map);
+
+	/* Calculate RSTAT, TSTAT, RQUEUE and TQUEUE values,
+	 * also assign queues to groups
+	 */
+	for_each_set_bit(i, &grp->rx_bit_map, priv->num_rx_queues) {
+		if (!grp->rx_queue)
+			grp->rx_queue = priv->rx_queue[i];
+		grp->num_rx_queues++;
+		grp->rstat |= (RSTAT_CLEAR_RHALT >> i);
+		priv->rqueue |= ((RQUEUE_EN0 | RQUEUE_EX0) >> i);
+		priv->rx_queue[i]->grp = grp;
+	}
+
+	for_each_set_bit(i, &grp->tx_bit_map, priv->num_tx_queues) {
+		if (!grp->tx_queue)
+			grp->tx_queue = priv->tx_queue[i];
+		grp->num_tx_queues++;
+		grp->tstat |= (TSTAT_CLEAR_THALT >> i);
+		priv->tqueue |= (TQUEUE_EN0 >> i);
+		priv->tx_queue[i]->grp = grp;
+	}
+
+	priv->num_grps++;
+
+	return 0;
+}
+
+static int gfar_of_group_count(struct device_node *np)
+{
+	struct device_node *child;
+	int num = 0;
+
+	for_each_available_child_of_node(np, child)
+		if (of_node_name_eq(child, "queue-group"))
+			num++;
+
+	return num;
+}
+
+/* Reads the controller's registers to determine what interface
+ * connects it to the PHY.
+ */
+static phy_interface_t gfar_get_interface(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 ecntrl;
+
+	ecntrl = gfar_read(&regs->ecntrl);
+
+	if (ecntrl & ECNTRL_SGMII_MODE)
+		return PHY_INTERFACE_MODE_SGMII;
+
+	if (ecntrl & ECNTRL_TBI_MODE) {
+		if (ecntrl & ECNTRL_REDUCED_MODE)
+			return PHY_INTERFACE_MODE_RTBI;
+		else
+			return PHY_INTERFACE_MODE_TBI;
+	}
+
+	if (ecntrl & ECNTRL_REDUCED_MODE) {
+		if (ecntrl & ECNTRL_REDUCED_MII_MODE) {
+			return PHY_INTERFACE_MODE_RMII;
+		}
+		else {
+			phy_interface_t interface = priv->interface;
+
+			/* This isn't autodetected right now, so it must
+			 * be set by the device tree or platform code.
+			 */
+			if (interface == PHY_INTERFACE_MODE_RGMII_ID)
+				return PHY_INTERFACE_MODE_RGMII_ID;
+
+			return PHY_INTERFACE_MODE_RGMII;
+		}
+	}
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
+		return PHY_INTERFACE_MODE_GMII;
+
+	return PHY_INTERFACE_MODE_MII;
+}
+
+static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
+{
+	const char *model;
+	int err = 0, i;
+	phy_interface_t interface;
+	struct net_device *dev = NULL;
+	struct gfar_private *priv = NULL;
+	struct device_node *np = ofdev->dev.of_node;
+	struct device_node *child = NULL;
+	u32 stash_len = 0;
+	u32 stash_idx = 0;
+	unsigned int num_tx_qs, num_rx_qs;
+	unsigned short mode;
+
+	if (!np)
+		return -ENODEV;
+
+	if (of_device_is_compatible(np, "fsl,etsec2"))
+		mode = MQ_MG_MODE;
+	else
+		mode = SQ_SG_MODE;
+
+	if (mode == SQ_SG_MODE) {
+		num_tx_qs = 1;
+		num_rx_qs = 1;
+	} else { /* MQ_MG_MODE */
+		/* get the actual number of supported groups */
+		unsigned int num_grps = gfar_of_group_count(np);
+
+		if (num_grps == 0 || num_grps > MAXGROUPS) {
+			dev_err(&ofdev->dev, "Invalid # of int groups(%d)\n",
+				num_grps);
+			pr_err("Cannot do alloc_etherdev, aborting\n");
+			return -EINVAL;
+		}
+
+		num_tx_qs = num_grps; /* one txq per int group */
+		num_rx_qs = num_grps; /* one rxq per int group */
+	}
+
+	if (num_tx_qs > MAX_TX_QS) {
+		pr_err("num_tx_qs(=%d) greater than MAX_TX_QS(=%d)\n",
+		       num_tx_qs, MAX_TX_QS);
+		pr_err("Cannot do alloc_etherdev, aborting\n");
+		return -EINVAL;
+	}
+
+	if (num_rx_qs > MAX_RX_QS) {
+		pr_err("num_rx_qs(=%d) greater than MAX_RX_QS(=%d)\n",
+		       num_rx_qs, MAX_RX_QS);
+		pr_err("Cannot do alloc_etherdev, aborting\n");
+		return -EINVAL;
+	}
+
+	*pdev = alloc_etherdev_mq(sizeof(*priv), num_tx_qs);
+	dev = *pdev;
+	if (NULL == dev)
+		return -ENOMEM;
+
+	priv = netdev_priv(dev);
+	priv->ndev = dev;
+
+	priv->mode = mode;
+
+	priv->num_tx_queues = num_tx_qs;
+	netif_set_real_num_rx_queues(dev, num_rx_qs);
+	priv->num_rx_queues = num_rx_qs;
+
+	err = gfar_alloc_tx_queues(priv);
+	if (err)
+		goto tx_alloc_failed;
+
+	err = gfar_alloc_rx_queues(priv);
+	if (err)
+		goto rx_alloc_failed;
+
+	err = of_property_read_string(np, "model", &model);
+	if (err) {
+		pr_err("Device model property missing, aborting\n");
+		goto rx_alloc_failed;
+	}
+
+	/* Init Rx queue filer rule set linked list */
+	INIT_LIST_HEAD(&priv->rx_list.list);
+	priv->rx_list.count = 0;
+	mutex_init(&priv->rx_queue_access);
+
+	for (i = 0; i < MAXGROUPS; i++)
+		priv->gfargrp[i].regs = NULL;
+
+	/* Parse and initialize group specific information */
+	if (priv->mode == MQ_MG_MODE) {
+		for_each_available_child_of_node(np, child) {
+			if (!of_node_name_eq(child, "queue-group"))
+				continue;
+
+			err = gfar_parse_group(child, priv, model);
+			if (err) {
+				of_node_put(child);
+				goto err_grp_init;
+			}
+		}
+	} else { /* SQ_SG_MODE */
+		err = gfar_parse_group(np, priv, model);
+		if (err)
+			goto err_grp_init;
+	}
+
+	if (of_property_read_bool(np, "bd-stash")) {
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_BD_STASHING;
+		priv->bd_stash_en = 1;
+	}
+
+	err = of_property_read_u32(np, "rx-stash-len", &stash_len);
+
+	if (err == 0)
+		priv->rx_stash_size = stash_len;
+
+	err = of_property_read_u32(np, "rx-stash-idx", &stash_idx);
+
+	if (err == 0)
+		priv->rx_stash_index = stash_idx;
+
+	if (stash_len || stash_idx)
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_BUF_STASHING;
+
+	err = of_get_ethdev_address(np, dev);
+	if (err) {
+		eth_hw_addr_random(dev);
+		dev_info(&ofdev->dev, "Using random MAC address: %pM\n", dev->dev_addr);
+	}
+
+	if (model && !strcasecmp(model, "TSEC"))
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_GIGABIT |
+				     FSL_GIANFAR_DEV_HAS_COALESCE |
+				     FSL_GIANFAR_DEV_HAS_RMON |
+				     FSL_GIANFAR_DEV_HAS_MULTI_INTR;
+
+	if (model && !strcasecmp(model, "eTSEC"))
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_GIGABIT |
+				     FSL_GIANFAR_DEV_HAS_COALESCE |
+				     FSL_GIANFAR_DEV_HAS_RMON |
+				     FSL_GIANFAR_DEV_HAS_MULTI_INTR |
+				     FSL_GIANFAR_DEV_HAS_CSUM |
+				     FSL_GIANFAR_DEV_HAS_VLAN |
+				     FSL_GIANFAR_DEV_HAS_MAGIC_PACKET |
+				     FSL_GIANFAR_DEV_HAS_EXTENDED_HASH |
+				     FSL_GIANFAR_DEV_HAS_TIMER |
+				     FSL_GIANFAR_DEV_HAS_RX_FILER;
+
+	/* Use PHY connection type from the DT node if one is specified there.
+	 * rgmii-id really needs to be specified. Other types can be
+	 * detected by hardware
+	 */
+	err = of_get_phy_mode(np, &interface);
+	if (!err)
+		priv->interface = interface;
+	else
+		priv->interface = gfar_get_interface(dev);
+
+	if (of_find_property(np, "fsl,magic-packet", NULL))
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_MAGIC_PACKET;
+
+	if (of_get_property(np, "fsl,wake-on-filer", NULL))
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_WAKE_ON_FILER;
+
+	priv->phy_node = of_parse_phandle(np, "phy-handle", 0);
+
+	/* In the case of a fixed PHY, the DT node associated
+	 * to the PHY is the Ethernet MAC DT node.
+	 */
+	if (!priv->phy_node && of_phy_is_fixed_link(np)) {
+		err = of_phy_register_fixed_link(np);
+		if (err)
+			goto err_grp_init;
+
+		priv->phy_node = of_node_get(np);
+	}
+
+	/* Find the TBI PHY.  If it's not there, we don't support SGMII */
+	priv->tbi_node = of_parse_phandle(np, "tbi-handle", 0);
+
+	return 0;
+
+err_grp_init:
+	unmap_group_regs(priv);
+rx_alloc_failed:
+	gfar_free_rx_queues(priv);
+tx_alloc_failed:
+	gfar_free_tx_queues(priv);
+	free_gfar_dev(priv);
+	return err;
+}
+
+static u32 cluster_entry_per_class(struct gfar_private *priv, u32 rqfar,
+				   u32 class)
+{
+	u32 rqfpr = FPR_FILER_MASK;
+	u32 rqfcr = 0x0;
+
+	rqfar--;
+	rqfcr = RQFCR_CLE | RQFCR_PID_MASK | RQFCR_CMP_EXACT;
+	priv->ftp_rqfpr[rqfar] = rqfpr;
+	priv->ftp_rqfcr[rqfar] = rqfcr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar--;
+	rqfcr = RQFCR_CMP_NOMATCH;
+	priv->ftp_rqfpr[rqfar] = rqfpr;
+	priv->ftp_rqfcr[rqfar] = rqfcr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar--;
+	rqfcr = RQFCR_CMP_EXACT | RQFCR_PID_PARSE | RQFCR_CLE | RQFCR_AND;
+	rqfpr = class;
+	priv->ftp_rqfcr[rqfar] = rqfcr;
+	priv->ftp_rqfpr[rqfar] = rqfpr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar--;
+	rqfcr = RQFCR_CMP_EXACT | RQFCR_PID_MASK | RQFCR_AND;
+	rqfpr = class;
+	priv->ftp_rqfcr[rqfar] = rqfcr;
+	priv->ftp_rqfpr[rqfar] = rqfpr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	return rqfar;
+}
+
+static void gfar_init_filer_table(struct gfar_private *priv)
+{
+	int i = 0x0;
+	u32 rqfar = MAX_FILER_IDX;
+	u32 rqfcr = 0x0;
+	u32 rqfpr = FPR_FILER_MASK;
+
+	/* Default rule */
+	rqfcr = RQFCR_CMP_MATCH;
+	priv->ftp_rqfcr[rqfar] = rqfcr;
+	priv->ftp_rqfpr[rqfar] = rqfpr;
+	gfar_write_filer(priv, rqfar, rqfcr, rqfpr);
+
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV6);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV6 | RQFPR_UDP);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV6 | RQFPR_TCP);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV4);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV4 | RQFPR_UDP);
+	rqfar = cluster_entry_per_class(priv, rqfar, RQFPR_IPV4 | RQFPR_TCP);
+
+	/* cur_filer_idx indicated the first non-masked rule */
+	priv->cur_filer_idx = rqfar;
+
+	/* Rest are masked rules */
+	rqfcr = RQFCR_CMP_NOMATCH;
+	for (i = 0; i < rqfar; i++) {
+		priv->ftp_rqfcr[i] = rqfcr;
+		priv->ftp_rqfpr[i] = rqfpr;
+		gfar_write_filer(priv, i, rqfcr, rqfpr);
+	}
+}
+
+#ifdef CONFIG_PPC
+static void __gfar_detect_errata_83xx(struct gfar_private *priv)
+{
+	unsigned int pvr = mfspr(SPRN_PVR);
+	unsigned int svr = mfspr(SPRN_SVR);
+	unsigned int mod = (svr >> 16) & 0xfff6; /* w/o E suffix */
+	unsigned int rev = svr & 0xffff;
+
+	/* MPC8313 Rev 2.0 and higher; All MPC837x */
+	if ((pvr == 0x80850010 && mod == 0x80b0 && rev >= 0x0020) ||
+	    (pvr == 0x80861010 && (mod & 0xfff9) == 0x80c0))
+		priv->errata |= GFAR_ERRATA_74;
+
+	/* MPC8313 and MPC837x all rev */
+	if ((pvr == 0x80850010 && mod == 0x80b0) ||
+	    (pvr == 0x80861010 && (mod & 0xfff9) == 0x80c0))
+		priv->errata |= GFAR_ERRATA_76;
+
+	/* MPC8313 Rev < 2.0 */
+	if (pvr == 0x80850010 && mod == 0x80b0 && rev < 0x0020)
+		priv->errata |= GFAR_ERRATA_12;
+}
+
+static void __gfar_detect_errata_85xx(struct gfar_private *priv)
+{
+	unsigned int svr = mfspr(SPRN_SVR);
+
+	if ((SVR_SOC_VER(svr) == SVR_8548) && (SVR_REV(svr) == 0x20))
+		priv->errata |= GFAR_ERRATA_12;
+	/* P2020/P1010 Rev 1; MPC8548 Rev 2 */
+	if (((SVR_SOC_VER(svr) == SVR_P2020) && (SVR_REV(svr) < 0x20)) ||
+	    ((SVR_SOC_VER(svr) == SVR_P2010) && (SVR_REV(svr) < 0x20)) ||
+	    ((SVR_SOC_VER(svr) == SVR_8548) && (SVR_REV(svr) < 0x31)))
+		priv->errata |= GFAR_ERRATA_76; /* aka eTSEC 20 */
+}
+#endif
+
+static void gfar_detect_errata(struct gfar_private *priv)
+{
+	struct device *dev = &priv->ofdev->dev;
+
+	/* no plans to fix */
+	priv->errata |= GFAR_ERRATA_A002;
+
+#ifdef CONFIG_PPC
+	if (pvr_version_is(PVR_VER_E500V1) || pvr_version_is(PVR_VER_E500V2))
+		__gfar_detect_errata_85xx(priv);
+	else /* non-mpc85xx parts, i.e. e300 core based */
+		__gfar_detect_errata_83xx(priv);
+#endif
+
+	if (priv->errata)
+		dev_info(dev, "enabled errata workarounds, flags: 0x%x\n",
+			 priv->errata);
+}
+
+static void gfar_init_addr_hash_table(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_EXTENDED_HASH) {
+		priv->extended_hash = 1;
+		priv->hash_width = 9;
+
+		priv->hash_regs[0] = &regs->igaddr0;
+		priv->hash_regs[1] = &regs->igaddr1;
+		priv->hash_regs[2] = &regs->igaddr2;
+		priv->hash_regs[3] = &regs->igaddr3;
+		priv->hash_regs[4] = &regs->igaddr4;
+		priv->hash_regs[5] = &regs->igaddr5;
+		priv->hash_regs[6] = &regs->igaddr6;
+		priv->hash_regs[7] = &regs->igaddr7;
+		priv->hash_regs[8] = &regs->gaddr0;
+		priv->hash_regs[9] = &regs->gaddr1;
+		priv->hash_regs[10] = &regs->gaddr2;
+		priv->hash_regs[11] = &regs->gaddr3;
+		priv->hash_regs[12] = &regs->gaddr4;
+		priv->hash_regs[13] = &regs->gaddr5;
+		priv->hash_regs[14] = &regs->gaddr6;
+		priv->hash_regs[15] = &regs->gaddr7;
+
+	} else {
+		priv->extended_hash = 0;
+		priv->hash_width = 8;
+
+		priv->hash_regs[0] = &regs->gaddr0;
+		priv->hash_regs[1] = &regs->gaddr1;
+		priv->hash_regs[2] = &regs->gaddr2;
+		priv->hash_regs[3] = &regs->gaddr3;
+		priv->hash_regs[4] = &regs->gaddr4;
+		priv->hash_regs[5] = &regs->gaddr5;
+		priv->hash_regs[6] = &regs->gaddr6;
+		priv->hash_regs[7] = &regs->gaddr7;
+	}
+}
+
+static int __gfar_is_rx_idle(struct gfar_private *priv)
+{
+	u32 res;
+
+	/* Normaly TSEC should not hang on GRS commands, so we should
+	 * actually wait for IEVENT_GRSC flag.
+	 */
+	if (!gfar_has_errata(priv, GFAR_ERRATA_A002))
+		return 0;
+
+	/* Read the eTSEC register at offset 0xD1C. If bits 7-14 are
+	 * the same as bits 23-30, the eTSEC Rx is assumed to be idle
+	 * and the Rx can be safely reset.
+	 */
+	res = gfar_read((void __iomem *)priv->gfargrp[0].regs + 0xd1c);
+	res &= 0x7f807f80;
+	if ((res & 0xffff) == (res >> 16))
+		return 1;
+
+	return 0;
+}
+
+/* Halt the receive and transmit queues */
+static void gfar_halt_nodisable(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	unsigned int timeout;
+	int stopped;
+
+	gfar_ints_disable(priv);
+
+	if (gfar_is_dma_stopped(priv))
+		return;
+
+	/* Stop the DMA, and wait for it to stop */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval |= (DMACTRL_GRS | DMACTRL_GTS);
+	gfar_write(&regs->dmactrl, tempval);
+
+retry:
+	timeout = 1000;
+	while (!(stopped = gfar_is_dma_stopped(priv)) && timeout) {
+		cpu_relax();
+		timeout--;
+	}
+
+	if (!timeout)
+		stopped = gfar_is_dma_stopped(priv);
+
+	if (!stopped && !gfar_is_rx_dma_stopped(priv) &&
+	    !__gfar_is_rx_idle(priv))
+		goto retry;
+}
+
+/* Halt the receive and transmit queues */
+static void gfar_halt(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+
+	/* Dissable the Rx/Tx hw queues */
+	gfar_write(&regs->rqueue, 0);
+	gfar_write(&regs->tqueue, 0);
+
+	mdelay(10);
+
+	gfar_halt_nodisable(priv);
+
+	/* Disable Rx/Tx DMA */
+	tempval = gfar_read(&regs->maccfg1);
+	tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
+	gfar_write(&regs->maccfg1, tempval);
+}
+
+static void free_skb_tx_queue(struct gfar_priv_tx_q *tx_queue)
+{
+	struct txbd8 *txbdp;
+	struct gfar_private *priv = netdev_priv(tx_queue->dev);
+	int i, j;
+
+	txbdp = tx_queue->tx_bd_base;
+
+	for (i = 0; i < tx_queue->tx_ring_size; i++) {
+		if (!tx_queue->tx_skbuff[i])
+			continue;
+
+		dma_unmap_single(priv->dev, be32_to_cpu(txbdp->bufPtr),
+				 be16_to_cpu(txbdp->length), DMA_TO_DEVICE);
+		txbdp->lstatus = 0;
+		for (j = 0; j < skb_shinfo(tx_queue->tx_skbuff[i])->nr_frags;
+		     j++) {
+			txbdp++;
+			dma_unmap_page(priv->dev, be32_to_cpu(txbdp->bufPtr),
+				       be16_to_cpu(txbdp->length),
+				       DMA_TO_DEVICE);
+		}
+		txbdp++;
+		dev_kfree_skb_any(tx_queue->tx_skbuff[i]);
+		tx_queue->tx_skbuff[i] = NULL;
+	}
+	kfree(tx_queue->tx_skbuff);
+	tx_queue->tx_skbuff = NULL;
+}
+
+static void free_skb_rx_queue(struct gfar_priv_rx_q *rx_queue)
+{
+	int i;
+
+	struct rxbd8 *rxbdp = rx_queue->rx_bd_base;
+
+	dev_kfree_skb(rx_queue->skb);
+
+	for (i = 0; i < rx_queue->rx_ring_size; i++) {
+		struct	gfar_rx_buff *rxb = &rx_queue->rx_buff[i];
+
+		rxbdp->lstatus = 0;
+		rxbdp->bufPtr = 0;
+		rxbdp++;
+
+		if (!rxb->page)
+			continue;
+
+		dma_unmap_page(rx_queue->dev, rxb->dma,
+			       PAGE_SIZE, DMA_FROM_DEVICE);
+		__free_page(rxb->page);
+
+		rxb->page = NULL;
+	}
+
+	kfree(rx_queue->rx_buff);
+	rx_queue->rx_buff = NULL;
+}
+
+/* If there are any tx skbs or rx skbs still around, free them.
+ * Then free tx_skbuff and rx_skbuff
+ */
+static void free_skb_resources(struct gfar_private *priv)
+{
+	struct gfar_priv_tx_q *tx_queue = NULL;
+	struct gfar_priv_rx_q *rx_queue = NULL;
+	int i;
+
+	/* Go through all the buffer descriptors and free their data buffers */
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		struct netdev_queue *txq;
+
+		tx_queue = priv->tx_queue[i];
+		txq = netdev_get_tx_queue(tx_queue->dev, tx_queue->qindex);
+		if (tx_queue->tx_skbuff)
+			free_skb_tx_queue(tx_queue);
+		netdev_tx_reset_queue(txq);
+	}
+
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		rx_queue = priv->rx_queue[i];
+		if (rx_queue->rx_buff)
+			free_skb_rx_queue(rx_queue);
+	}
+
+	dma_free_coherent(priv->dev,
+			  sizeof(struct txbd8) * priv->total_tx_ring_size +
+			  sizeof(struct rxbd8) * priv->total_rx_ring_size,
+			  priv->tx_queue[0]->tx_bd_base,
+			  priv->tx_queue[0]->tx_bd_dma_base);
+}
+
+void stop_gfar(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	netif_tx_stop_all_queues(dev);
+
+	smp_mb__before_atomic();
+	set_bit(GFAR_DOWN, &priv->state);
+	smp_mb__after_atomic();
+
+	disable_napi(priv);
+
+	/* disable ints and gracefully shut down Rx/Tx DMA */
+	gfar_halt(priv);
+
+	phy_stop(dev->phydev);
+
+	free_skb_resources(priv);
+}
+
+static void gfar_start(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	int i = 0;
+
+	/* Enable Rx/Tx hw queues */
+	gfar_write(&regs->rqueue, priv->rqueue);
+	gfar_write(&regs->tqueue, priv->tqueue);
+
+	/* Initialize DMACTRL to have WWR and WOP */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval |= DMACTRL_INIT_SETTINGS;
+	gfar_write(&regs->dmactrl, tempval);
+
+	/* Make sure we aren't stopped */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
+	gfar_write(&regs->dmactrl, tempval);
+
+	for (i = 0; i < priv->num_grps; i++) {
+		regs = priv->gfargrp[i].regs;
+		/* Clear THLT/RHLT, so that the DMA starts polling now */
+		gfar_write(&regs->tstat, priv->gfargrp[i].tstat);
+		gfar_write(&regs->rstat, priv->gfargrp[i].rstat);
+	}
+
+	/* Enable Rx/Tx DMA */
+	tempval = gfar_read(&regs->maccfg1);
+	tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
+	gfar_write(&regs->maccfg1, tempval);
+
+	gfar_ints_enable(priv);
+
+	netif_trans_update(priv->ndev); /* prevent tx timeout */
+}
+
+static bool gfar_new_page(struct gfar_priv_rx_q *rxq, struct gfar_rx_buff *rxb)
+{
+	struct page *page;
+	dma_addr_t addr;
+
+	page = dev_alloc_page();
+	if (unlikely(!page))
+		return false;
+
+	addr = dma_map_page(rxq->dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
+	if (unlikely(dma_mapping_error(rxq->dev, addr))) {
+		__free_page(page);
+
+		return false;
+	}
+
+	rxb->dma = addr;
+	rxb->page = page;
+	rxb->page_offset = 0;
+
+	return true;
+}
+
+static void gfar_rx_alloc_err(struct gfar_priv_rx_q *rx_queue)
+{
+	struct gfar_private *priv = netdev_priv(rx_queue->ndev);
+	struct gfar_extra_stats *estats = &priv->extra_stats;
+
+	netdev_err(rx_queue->ndev, "Can't alloc RX buffers\n");
+	atomic64_inc(&estats->rx_alloc_err);
+}
+
+static void gfar_alloc_rx_buffs(struct gfar_priv_rx_q *rx_queue,
+				int alloc_cnt)
+{
+	struct rxbd8 *bdp;
+	struct gfar_rx_buff *rxb;
+	int i;
+
+	i = rx_queue->next_to_use;
+	bdp = &rx_queue->rx_bd_base[i];
+	rxb = &rx_queue->rx_buff[i];
+
+	while (alloc_cnt--) {
+		/* try reuse page */
+		if (unlikely(!rxb->page)) {
+			if (unlikely(!gfar_new_page(rx_queue, rxb))) {
+				gfar_rx_alloc_err(rx_queue);
+				break;
+			}
+		}
+
+		/* Setup the new RxBD */
+		gfar_init_rxbdp(rx_queue, bdp,
+				rxb->dma + rxb->page_offset + RXBUF_ALIGNMENT);
+
+		/* Update to the next pointer */
+		bdp++;
+		rxb++;
+
+		if (unlikely(++i == rx_queue->rx_ring_size)) {
+			i = 0;
+			bdp = rx_queue->rx_bd_base;
+			rxb = rx_queue->rx_buff;
+		}
+	}
+
+	rx_queue->next_to_use = i;
+	rx_queue->next_to_alloc = i;
+}
+
+static void gfar_init_bds(struct net_device *ndev)
+{
+	struct gfar_private *priv = netdev_priv(ndev);
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	struct gfar_priv_tx_q *tx_queue = NULL;
+	struct gfar_priv_rx_q *rx_queue = NULL;
+	struct txbd8 *txbdp;
+	u32 __iomem *rfbptr;
+	int i, j;
+
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		tx_queue = priv->tx_queue[i];
+		/* Initialize some variables in our dev structure */
+		tx_queue->num_txbdfree = tx_queue->tx_ring_size;
+		tx_queue->dirty_tx = tx_queue->tx_bd_base;
+		tx_queue->cur_tx = tx_queue->tx_bd_base;
+		tx_queue->skb_curtx = 0;
+		tx_queue->skb_dirtytx = 0;
+
+		/* Initialize Transmit Descriptor Ring */
+		txbdp = tx_queue->tx_bd_base;
+		for (j = 0; j < tx_queue->tx_ring_size; j++) {
+			txbdp->lstatus = 0;
+			txbdp->bufPtr = 0;
+			txbdp++;
+		}
+
+		/* Set the last descriptor in the ring to indicate wrap */
+		txbdp--;
+		txbdp->status = cpu_to_be16(be16_to_cpu(txbdp->status) |
+					    TXBD_WRAP);
+	}
+
+	rfbptr = &regs->rfbptr0;
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		rx_queue = priv->rx_queue[i];
+
+		rx_queue->next_to_clean = 0;
+		rx_queue->next_to_use = 0;
+		rx_queue->next_to_alloc = 0;
+
+		/* make sure next_to_clean != next_to_use after this
+		 * by leaving at least 1 unused descriptor
+		 */
+		gfar_alloc_rx_buffs(rx_queue, gfar_rxbd_unused(rx_queue));
+
+		rx_queue->rfbptr = rfbptr;
+		rfbptr += 2;
+	}
+}
+
+static int gfar_alloc_skb_resources(struct net_device *ndev)
+{
+	void *vaddr;
+	dma_addr_t addr;
+	int i, j;
+	struct gfar_private *priv = netdev_priv(ndev);
+	struct device *dev = priv->dev;
+	struct gfar_priv_tx_q *tx_queue = NULL;
+	struct gfar_priv_rx_q *rx_queue = NULL;
+
+	priv->total_tx_ring_size = 0;
+	for (i = 0; i < priv->num_tx_queues; i++)
+		priv->total_tx_ring_size += priv->tx_queue[i]->tx_ring_size;
+
+	priv->total_rx_ring_size = 0;
+	for (i = 0; i < priv->num_rx_queues; i++)
+		priv->total_rx_ring_size += priv->rx_queue[i]->rx_ring_size;
+
+	/* Allocate memory for the buffer descriptors */
+	vaddr = dma_alloc_coherent(dev,
+				   (priv->total_tx_ring_size *
+				    sizeof(struct txbd8)) +
+				   (priv->total_rx_ring_size *
+				    sizeof(struct rxbd8)),
+				   &addr, GFP_KERNEL);
+	if (!vaddr)
+		return -ENOMEM;
+
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		tx_queue = priv->tx_queue[i];
+		tx_queue->tx_bd_base = vaddr;
+		tx_queue->tx_bd_dma_base = addr;
+		tx_queue->dev = ndev;
+		/* enet DMA only understands physical addresses */
+		addr  += sizeof(struct txbd8) * tx_queue->tx_ring_size;
+		vaddr += sizeof(struct txbd8) * tx_queue->tx_ring_size;
+	}
+
+	/* Start the rx descriptor ring where the tx ring leaves off */
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		rx_queue = priv->rx_queue[i];
+		rx_queue->rx_bd_base = vaddr;
+		rx_queue->rx_bd_dma_base = addr;
+		rx_queue->ndev = ndev;
+		rx_queue->dev = dev;
+		addr  += sizeof(struct rxbd8) * rx_queue->rx_ring_size;
+		vaddr += sizeof(struct rxbd8) * rx_queue->rx_ring_size;
+	}
+
+	/* Setup the skbuff rings */
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		tx_queue = priv->tx_queue[i];
+		tx_queue->tx_skbuff =
+			kmalloc_array(tx_queue->tx_ring_size,
+				      sizeof(*tx_queue->tx_skbuff),
+				      GFP_KERNEL);
+		if (!tx_queue->tx_skbuff)
+			goto cleanup;
+
+		for (j = 0; j < tx_queue->tx_ring_size; j++)
+			tx_queue->tx_skbuff[j] = NULL;
+	}
+
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		rx_queue = priv->rx_queue[i];
+		rx_queue->rx_buff = kcalloc(rx_queue->rx_ring_size,
+					    sizeof(*rx_queue->rx_buff),
+					    GFP_KERNEL);
+		if (!rx_queue->rx_buff)
+			goto cleanup;
+	}
+
+	gfar_init_bds(ndev);
+
+	return 0;
+
+cleanup:
+	free_skb_resources(priv);
+	return -ENOMEM;
+}
+
+/* Bring the controller up and running */
+int startup_gfar(struct net_device *ndev)
+{
+	struct gfar_private *priv = netdev_priv(ndev);
+	int err;
+
+	gfar_mac_reset(priv);
+
+	err = gfar_alloc_skb_resources(ndev);
+	if (err)
+		return err;
+
+	gfar_init_tx_rx_base(priv);
+
+	smp_mb__before_atomic();
+	clear_bit(GFAR_DOWN, &priv->state);
+	smp_mb__after_atomic();
+
+	/* Start Rx/Tx DMA and enable the interrupts */
+	gfar_start(priv);
+
+	/* force link state update after mac reset */
+	priv->oldlink = 0;
+	priv->oldspeed = 0;
+	priv->oldduplex = -1;
+
+	phy_start(ndev->phydev);
+
+	enable_napi(priv);
+
+	netif_tx_wake_all_queues(ndev);
+
+	return 0;
+}
+
+static u32 gfar_get_flowctrl_cfg(struct gfar_private *priv)
+{
+	struct net_device *ndev = priv->ndev;
+	struct phy_device *phydev = ndev->phydev;
+	u32 val = 0;
+
+	if (!phydev->duplex)
+		return val;
+
+	if (!priv->pause_aneg_en) {
+		if (priv->tx_pause_en)
+			val |= MACCFG1_TX_FLOW;
+		if (priv->rx_pause_en)
+			val |= MACCFG1_RX_FLOW;
+	} else {
+		u16 lcl_adv, rmt_adv;
+		u8 flowctrl;
+		/* get link partner capabilities */
+		rmt_adv = 0;
+		if (phydev->pause)
+			rmt_adv = LPA_PAUSE_CAP;
+		if (phydev->asym_pause)
+			rmt_adv |= LPA_PAUSE_ASYM;
+
+		lcl_adv = linkmode_adv_to_lcl_adv_t(phydev->advertising);
+		flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
+		if (flowctrl & FLOW_CTRL_TX)
+			val |= MACCFG1_TX_FLOW;
+		if (flowctrl & FLOW_CTRL_RX)
+			val |= MACCFG1_RX_FLOW;
+	}
+
+	return val;
+}
+
+static noinline void gfar_update_link_state(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	struct net_device *ndev = priv->ndev;
+	struct phy_device *phydev = ndev->phydev;
+	struct gfar_priv_rx_q *rx_queue = NULL;
+	int i;
+
+	if (unlikely(test_bit(GFAR_RESETTING, &priv->state)))
+		return;
+
+	if (phydev->link) {
+		u32 tempval1 = gfar_read(&regs->maccfg1);
+		u32 tempval = gfar_read(&regs->maccfg2);
+		u32 ecntrl = gfar_read(&regs->ecntrl);
+		u32 tx_flow_oldval = (tempval1 & MACCFG1_TX_FLOW);
+
+		if (phydev->duplex != priv->oldduplex) {
+			if (!(phydev->duplex))
+				tempval &= ~(MACCFG2_FULL_DUPLEX);
+			else
+				tempval |= MACCFG2_FULL_DUPLEX;
+
+			priv->oldduplex = phydev->duplex;
+		}
+
+		if (phydev->speed != priv->oldspeed) {
+			switch (phydev->speed) {
+			case 1000:
+				tempval =
+				    ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
+
+				ecntrl &= ~(ECNTRL_R100);
+				break;
+			case 100:
+			case 10:
+				tempval =
+				    ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
+
+				/* Reduced mode distinguishes
+				 * between 10 and 100
+				 */
+				if (phydev->speed == SPEED_100)
+					ecntrl |= ECNTRL_R100;
+				else
+					ecntrl &= ~(ECNTRL_R100);
+				break;
+			default:
+				netif_warn(priv, link, priv->ndev,
+					   "Ack!  Speed (%d) is not 10/100/1000!\n",
+					   phydev->speed);
+				break;
+			}
+
+			priv->oldspeed = phydev->speed;
+		}
+
+		tempval1 &= ~(MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
+		tempval1 |= gfar_get_flowctrl_cfg(priv);
+
+		/* Turn last free buffer recording on */
+		if ((tempval1 & MACCFG1_TX_FLOW) && !tx_flow_oldval) {
+			for (i = 0; i < priv->num_rx_queues; i++) {
+				u32 bdp_dma;
+
+				rx_queue = priv->rx_queue[i];
+				bdp_dma = gfar_rxbd_dma_lastfree(rx_queue);
+				gfar_write(rx_queue->rfbptr, bdp_dma);
+			}
+
+			priv->tx_actual_en = 1;
+		}
+
+		if (unlikely(!(tempval1 & MACCFG1_TX_FLOW) && tx_flow_oldval))
+			priv->tx_actual_en = 0;
+
+		gfar_write(&regs->maccfg1, tempval1);
+		gfar_write(&regs->maccfg2, tempval);
+		gfar_write(&regs->ecntrl, ecntrl);
+
+		if (!priv->oldlink)
+			priv->oldlink = 1;
+
+	} else if (priv->oldlink) {
+		priv->oldlink = 0;
+		priv->oldspeed = 0;
+		priv->oldduplex = -1;
+	}
+
+	if (netif_msg_link(priv))
+		phy_print_status(phydev);
+}
+
+/* Called every time the controller might need to be made
+ * aware of new link state.  The PHY code conveys this
+ * information through variables in the phydev structure, and this
+ * function converts those variables into the appropriate
+ * register values, and can bring down the device if needed.
+ */
+static void adjust_link(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct phy_device *phydev = dev->phydev;
+
+	if (unlikely(phydev->link != priv->oldlink ||
+		     (phydev->link && (phydev->duplex != priv->oldduplex ||
+				       phydev->speed != priv->oldspeed))))
+		gfar_update_link_state(priv);
+}
+
+/* Initialize TBI PHY interface for communicating with the
+ * SERDES lynx PHY on the chip.  We communicate with this PHY
+ * through the MDIO bus on each controller, treating it as a
+ * "normal" PHY at the address found in the TBIPA register.  We assume
+ * that the TBIPA register is valid.  Either the MDIO bus code will set
+ * it to a value that doesn't conflict with other PHYs on the bus, or the
+ * value doesn't matter, as there are no other PHYs on the bus.
+ */
+static void gfar_configure_serdes(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct phy_device *tbiphy;
+
+	if (!priv->tbi_node) {
+		dev_warn(&dev->dev, "error: SGMII mode requires that the "
+				    "device tree specify a tbi-handle\n");
+		return;
+	}
+
+	tbiphy = of_phy_find_device(priv->tbi_node);
+	if (!tbiphy) {
+		dev_err(&dev->dev, "error: Could not get TBI device\n");
+		return;
+	}
+
+	/* If the link is already up, we must already be ok, and don't need to
+	 * configure and reset the TBI<->SerDes link.  Maybe U-Boot configured
+	 * everything for us?  Resetting it takes the link down and requires
+	 * several seconds for it to come back.
+	 */
+	if (phy_read(tbiphy, MII_BMSR) & BMSR_LSTATUS) {
+		put_device(&tbiphy->mdio.dev);
+		return;
+	}
+
+	/* Single clk mode, mii mode off(for serdes communication) */
+	phy_write(tbiphy, MII_TBICON, TBICON_CLK_SELECT);
+
+	phy_write(tbiphy, MII_ADVERTISE,
+		  ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
+		  ADVERTISE_1000XPSE_ASYM);
+
+	phy_write(tbiphy, MII_BMCR,
+		  BMCR_ANENABLE | BMCR_ANRESTART | BMCR_FULLDPLX |
+		  BMCR_SPEED1000);
+
+	put_device(&tbiphy->mdio.dev);
+}
+
+/* Initializes driver's PHY state, and attaches to the PHY.
+ * Returns 0 on success.
+ */
+static int init_phy(struct net_device *dev)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
+	struct gfar_private *priv = netdev_priv(dev);
+	phy_interface_t interface = priv->interface;
+	struct phy_device *phydev;
+	struct ethtool_eee edata;
+
+	linkmode_set_bit_array(phy_10_100_features_array,
+			       ARRAY_SIZE(phy_10_100_features_array),
+			       mask);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, mask);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_MII_BIT, mask);
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_GIGABIT)
+		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, mask);
+
+	priv->oldlink = 0;
+	priv->oldspeed = 0;
+	priv->oldduplex = -1;
+
+	phydev = of_phy_connect(dev, priv->phy_node, &adjust_link, 0,
+				interface);
+	if (!phydev) {
+		dev_err(&dev->dev, "could not attach to PHY\n");
+		return -ENODEV;
+	}
+
+	if (interface == PHY_INTERFACE_MODE_SGMII)
+		gfar_configure_serdes(dev);
+
+	/* Remove any features not supported by the controller */
+	linkmode_and(phydev->supported, phydev->supported, mask);
+	linkmode_copy(phydev->advertising, phydev->supported);
+
+	/* Add support for flow control */
+	phy_support_asym_pause(phydev);
+
+	/* disable EEE autoneg, EEE not supported by eTSEC */
+	memset(&edata, 0, sizeof(struct ethtool_eee));
+	phy_ethtool_set_eee(phydev, &edata);
+
+	return 0;
+}
+
+static inline struct txfcb *gfar_add_fcb(struct sk_buff *skb)
+{
+	struct txfcb *fcb = skb_push(skb, GMAC_FCB_LEN);
+
+	memset(fcb, 0, GMAC_FCB_LEN);
+
+	return fcb;
+}
+
+static inline void gfar_tx_checksum(struct sk_buff *skb, struct txfcb *fcb,
+				    int fcb_length)
+{
+	/* If we're here, it's a IP packet with a TCP or UDP
+	 * payload.  We set it to checksum, using a pseudo-header
+	 * we provide
+	 */
+	u8 flags = TXFCB_DEFAULT;
+
+	/* Tell the controller what the protocol is
+	 * And provide the already calculated phcs
+	 */
+	if (ip_hdr(skb)->protocol == IPPROTO_UDP) {
+		flags |= TXFCB_UDP;
+		fcb->phcs = (__force __be16)(udp_hdr(skb)->check);
+	} else
+		fcb->phcs = (__force __be16)(tcp_hdr(skb)->check);
+
+	/* l3os is the distance between the start of the
+	 * frame (skb->data) and the start of the IP hdr.
+	 * l4os is the distance between the start of the
+	 * l3 hdr and the l4 hdr
+	 */
+	fcb->l3os = (u8)(skb_network_offset(skb) - fcb_length);
+	fcb->l4os = skb_network_header_len(skb);
+
+	fcb->flags = flags;
+}
+
+static inline void gfar_tx_vlan(struct sk_buff *skb, struct txfcb *fcb)
+{
+	fcb->flags |= TXFCB_VLN;
+	fcb->vlctl = cpu_to_be16(skb_vlan_tag_get(skb));
+}
+
+static inline struct txbd8 *skip_txbd(struct txbd8 *bdp, int stride,
+				      struct txbd8 *base, int ring_size)
+{
+	struct txbd8 *new_bd = bdp + stride;
+
+	return (new_bd >= (base + ring_size)) ? (new_bd - ring_size) : new_bd;
+}
+
+static inline struct txbd8 *next_txbd(struct txbd8 *bdp, struct txbd8 *base,
+				      int ring_size)
+{
+	return skip_txbd(bdp, 1, base, ring_size);
+}
+
+/* eTSEC12: csum generation not supported for some fcb offsets */
+static inline bool gfar_csum_errata_12(struct gfar_private *priv,
+				       unsigned long fcb_addr)
+{
+	return (gfar_has_errata(priv, GFAR_ERRATA_12) &&
+	       (fcb_addr % 0x20) > 0x18);
+}
+
+/* eTSEC76: csum generation for frames larger than 2500 may
+ * cause excess delays before start of transmission
+ */
+static inline bool gfar_csum_errata_76(struct gfar_private *priv,
+				       unsigned int len)
+{
+	return (gfar_has_errata(priv, GFAR_ERRATA_76) &&
+	       (len > 2500));
+}
+
+/* This is called by the kernel when a frame is ready for transmission.
+ * It is pointed to by the dev->hard_start_xmit function pointer
+ */
+static netdev_tx_t gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar_priv_tx_q *tx_queue = NULL;
+	struct netdev_queue *txq;
+	struct gfar __iomem *regs = NULL;
+	struct txfcb *fcb = NULL;
+	struct txbd8 *txbdp, *txbdp_start, *base, *txbdp_tstamp = NULL;
+	u32 lstatus;
+	skb_frag_t *frag;
+	int i, rq = 0;
+	int do_tstamp, do_csum, do_vlan;
+	u32 bufaddr;
+	unsigned int nr_frags, nr_txbds, bytes_sent, fcb_len = 0;
+
+	rq = skb->queue_mapping;
+	tx_queue = priv->tx_queue[rq];
+	txq = netdev_get_tx_queue(dev, rq);
+	base = tx_queue->tx_bd_base;
+	regs = tx_queue->grp->regs;
+
+	do_csum = (CHECKSUM_PARTIAL == skb->ip_summed);
+	do_vlan = skb_vlan_tag_present(skb);
+	do_tstamp = (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
+		    priv->hwts_tx_en;
+
+	if (do_csum || do_vlan)
+		fcb_len = GMAC_FCB_LEN;
+
+	/* check if time stamp should be generated */
+	if (unlikely(do_tstamp))
+		fcb_len = GMAC_FCB_LEN + GMAC_TXPAL_LEN;
+
+	/* make space for additional header when fcb is needed */
+	if (fcb_len) {
+		if (unlikely(skb_cow_head(skb, fcb_len))) {
+			dev->stats.tx_errors++;
+			dev_kfree_skb_any(skb);
+			return NETDEV_TX_OK;
+		}
+	}
+
+	/* total number of fragments in the SKB */
+	nr_frags = skb_shinfo(skb)->nr_frags;
+
+	/* calculate the required number of TxBDs for this skb */
+	if (unlikely(do_tstamp))
+		nr_txbds = nr_frags + 2;
+	else
+		nr_txbds = nr_frags + 1;
+
+	/* check if there is space to queue this packet */
+	if (nr_txbds > tx_queue->num_txbdfree) {
+		/* no space, stop the queue */
+		netif_tx_stop_queue(txq);
+		dev->stats.tx_fifo_errors++;
+		return NETDEV_TX_BUSY;
+	}
+
+	/* Update transmit stats */
+	bytes_sent = skb->len;
+	tx_queue->stats.tx_bytes += bytes_sent;
+	/* keep Tx bytes on wire for BQL accounting */
+	GFAR_CB(skb)->bytes_sent = bytes_sent;
+	tx_queue->stats.tx_packets++;
+
+	txbdp = txbdp_start = tx_queue->cur_tx;
+	lstatus = be32_to_cpu(txbdp->lstatus);
+
+	/* Add TxPAL between FCB and frame if required */
+	if (unlikely(do_tstamp)) {
+		skb_push(skb, GMAC_TXPAL_LEN);
+		memset(skb->data, 0, GMAC_TXPAL_LEN);
+	}
+
+	/* Add TxFCB if required */
+	if (fcb_len) {
+		fcb = gfar_add_fcb(skb);
+		lstatus |= BD_LFLAG(TXBD_TOE);
+	}
+
+	/* Set up checksumming */
+	if (do_csum) {
+		gfar_tx_checksum(skb, fcb, fcb_len);
+
+		if (unlikely(gfar_csum_errata_12(priv, (unsigned long)fcb)) ||
+		    unlikely(gfar_csum_errata_76(priv, skb->len))) {
+			__skb_pull(skb, GMAC_FCB_LEN);
+			skb_checksum_help(skb);
+			if (do_vlan || do_tstamp) {
+				/* put back a new fcb for vlan/tstamp TOE */
+				fcb = gfar_add_fcb(skb);
+			} else {
+				/* Tx TOE not used */
+				lstatus &= ~(BD_LFLAG(TXBD_TOE));
+				fcb = NULL;
+			}
+		}
+	}
+
+	if (do_vlan)
+		gfar_tx_vlan(skb, fcb);
+
+	bufaddr = dma_map_single(priv->dev, skb->data, skb_headlen(skb),
+				 DMA_TO_DEVICE);
+	if (unlikely(dma_mapping_error(priv->dev, bufaddr)))
+		goto dma_map_err;
+
+	txbdp_start->bufPtr = cpu_to_be32(bufaddr);
+
+	/* Time stamp insertion requires one additional TxBD */
+	if (unlikely(do_tstamp))
+		txbdp_tstamp = txbdp = next_txbd(txbdp, base,
+						 tx_queue->tx_ring_size);
+
+	if (likely(!nr_frags)) {
+		if (likely(!do_tstamp))
+			lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
+	} else {
+		u32 lstatus_start = lstatus;
+
+		/* Place the fragment addresses and lengths into the TxBDs */
+		frag = &skb_shinfo(skb)->frags[0];
+		for (i = 0; i < nr_frags; i++, frag++) {
+			unsigned int size;
+
+			/* Point at the next BD, wrapping as needed */
+			txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
+
+			size = skb_frag_size(frag);
+
+			lstatus = be32_to_cpu(txbdp->lstatus) | size |
+				  BD_LFLAG(TXBD_READY);
+
+			/* Handle the last BD specially */
+			if (i == nr_frags - 1)
+				lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
+
+			bufaddr = skb_frag_dma_map(priv->dev, frag, 0,
+						   size, DMA_TO_DEVICE);
+			if (unlikely(dma_mapping_error(priv->dev, bufaddr)))
+				goto dma_map_err;
+
+			/* set the TxBD length and buffer pointer */
+			txbdp->bufPtr = cpu_to_be32(bufaddr);
+			txbdp->lstatus = cpu_to_be32(lstatus);
+		}
+
+		lstatus = lstatus_start;
+	}
+
+	/* If time stamping is requested one additional TxBD must be set up. The
+	 * first TxBD points to the FCB and must have a data length of
+	 * GMAC_FCB_LEN. The second TxBD points to the actual frame data with
+	 * the full frame length.
+	 */
+	if (unlikely(do_tstamp)) {
+		u32 lstatus_ts = be32_to_cpu(txbdp_tstamp->lstatus);
+
+		bufaddr = be32_to_cpu(txbdp_start->bufPtr);
+		bufaddr += fcb_len;
+
+		lstatus_ts |= BD_LFLAG(TXBD_READY) |
+			      (skb_headlen(skb) - fcb_len);
+		if (!nr_frags)
+			lstatus_ts |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
+
+		txbdp_tstamp->bufPtr = cpu_to_be32(bufaddr);
+		txbdp_tstamp->lstatus = cpu_to_be32(lstatus_ts);
+		lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | GMAC_FCB_LEN;
+
+		/* Setup tx hardware time stamping */
+		skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
+		fcb->ptp = 1;
+	} else {
+		lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
+	}
+
+	skb_tx_timestamp(skb);
+	netdev_tx_sent_queue(txq, bytes_sent);
+
+	gfar_wmb();
+
+	txbdp_start->lstatus = cpu_to_be32(lstatus);
+
+	gfar_wmb(); /* force lstatus write before tx_skbuff */
+
+	tx_queue->tx_skbuff[tx_queue->skb_curtx] = skb;
+
+	/* Update the current skb pointer to the next entry we will use
+	 * (wrapping if necessary)
+	 */
+	tx_queue->skb_curtx = (tx_queue->skb_curtx + 1) &
+			      TX_RING_MOD_MASK(tx_queue->tx_ring_size);
+
+	tx_queue->cur_tx = next_txbd(txbdp, base, tx_queue->tx_ring_size);
+
+	/* We can work in parallel with gfar_clean_tx_ring(), except
+	 * when modifying num_txbdfree. Note that we didn't grab the lock
+	 * when we were reading the num_txbdfree and checking for available
+	 * space, that's because outside of this function it can only grow.
+	 */
+	spin_lock_bh(&tx_queue->txlock);
+	/* reduce TxBD free count */
+	tx_queue->num_txbdfree -= (nr_txbds);
+	spin_unlock_bh(&tx_queue->txlock);
+
+	/* If the next BD still needs to be cleaned up, then the bds
+	 * are full.  We need to tell the kernel to stop sending us stuff.
+	 */
+	if (!tx_queue->num_txbdfree) {
+		netif_tx_stop_queue(txq);
+
+		dev->stats.tx_fifo_errors++;
+	}
+
+	/* Tell the DMA to go go go */
+	gfar_write(&regs->tstat, TSTAT_CLEAR_THALT >> tx_queue->qindex);
+
+	return NETDEV_TX_OK;
+
+dma_map_err:
+	txbdp = next_txbd(txbdp_start, base, tx_queue->tx_ring_size);
+	if (do_tstamp)
+		txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
+	for (i = 0; i < nr_frags; i++) {
+		lstatus = be32_to_cpu(txbdp->lstatus);
+		if (!(lstatus & BD_LFLAG(TXBD_READY)))
+			break;
+
+		lstatus &= ~BD_LFLAG(TXBD_READY);
+		txbdp->lstatus = cpu_to_be32(lstatus);
+		bufaddr = be32_to_cpu(txbdp->bufPtr);
+		dma_unmap_page(priv->dev, bufaddr, be16_to_cpu(txbdp->length),
+			       DMA_TO_DEVICE);
+		txbdp = next_txbd(txbdp, base, tx_queue->tx_ring_size);
+	}
+	gfar_wmb();
+	dev_kfree_skb_any(skb);
+	return NETDEV_TX_OK;
+}
+
+/* Changes the mac address if the controller is not running. */
+static int gfar_set_mac_address(struct net_device *dev)
+{
+	gfar_set_mac_for_addr(dev, 0, dev->dev_addr);
+
+	return 0;
+}
+
+static int gfar_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	while (test_and_set_bit_lock(GFAR_RESETTING, &priv->state))
+		cpu_relax();
+
+	if (dev->flags & IFF_UP)
+		stop_gfar(dev);
+
+	dev->mtu = new_mtu;
+
+	if (dev->flags & IFF_UP)
+		startup_gfar(dev);
+
+	clear_bit_unlock(GFAR_RESETTING, &priv->state);
+
+	return 0;
+}
+
+static void reset_gfar(struct net_device *ndev)
+{
+	struct gfar_private *priv = netdev_priv(ndev);
+
+	while (test_and_set_bit_lock(GFAR_RESETTING, &priv->state))
+		cpu_relax();
+
+	stop_gfar(ndev);
+	startup_gfar(ndev);
+
+	clear_bit_unlock(GFAR_RESETTING, &priv->state);
+}
+
+/* gfar_reset_task gets scheduled when a packet has not been
+ * transmitted after a set amount of time.
+ * For now, assume that clearing out all the structures, and
+ * starting over will fix the problem.
+ */
+static void gfar_reset_task(struct work_struct *work)
+{
+	struct gfar_private *priv = container_of(work, struct gfar_private,
+						 reset_task);
+	reset_gfar(priv->ndev);
+}
+
+static void gfar_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	dev->stats.tx_errors++;
+	schedule_work(&priv->reset_task);
+}
+
+static int gfar_hwtstamp_set(struct net_device *netdev, struct ifreq *ifr)
+{
+	struct hwtstamp_config config;
+	struct gfar_private *priv = netdev_priv(netdev);
+
+	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+		return -EFAULT;
+
+	switch (config.tx_type) {
+	case HWTSTAMP_TX_OFF:
+		priv->hwts_tx_en = 0;
+		break;
+	case HWTSTAMP_TX_ON:
+		if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_TIMER))
+			return -ERANGE;
+		priv->hwts_tx_en = 1;
+		break;
+	default:
+		return -ERANGE;
+	}
+
+	switch (config.rx_filter) {
+	case HWTSTAMP_FILTER_NONE:
+		if (priv->hwts_rx_en) {
+			priv->hwts_rx_en = 0;
+			reset_gfar(netdev);
+		}
+		break;
+	default:
+		if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_TIMER))
+			return -ERANGE;
+		if (!priv->hwts_rx_en) {
+			priv->hwts_rx_en = 1;
+			reset_gfar(netdev);
+		}
+		config.rx_filter = HWTSTAMP_FILTER_ALL;
+		break;
+	}
+
+	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+		-EFAULT : 0;
+}
+
+static int gfar_hwtstamp_get(struct net_device *netdev, struct ifreq *ifr)
+{
+	struct hwtstamp_config config;
+	struct gfar_private *priv = netdev_priv(netdev);
+
+	config.flags = 0;
+	config.tx_type = priv->hwts_tx_en ? HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
+	config.rx_filter = (priv->hwts_rx_en ?
+			    HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE);
+
+	return copy_to_user(ifr->ifr_data, &config, sizeof(config)) ?
+		-EFAULT : 0;
+}
+
+static int gfar_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct phy_device *phydev = dev->phydev;
+
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	if (cmd == SIOCSHWTSTAMP)
+		return gfar_hwtstamp_set(dev, rq);
+	if (cmd == SIOCGHWTSTAMP)
+		return gfar_hwtstamp_get(dev, rq);
+
+	if (!phydev)
+		return -ENODEV;
+
+	return phy_mii_ioctl(phydev, rq, cmd);
+}
+
+/* Interrupt Handler for Transmit complete */
+static void gfar_clean_tx_ring(struct gfar_priv_tx_q *tx_queue)
+{
+	struct net_device *dev = tx_queue->dev;
+	struct netdev_queue *txq;
+	struct gfar_private *priv = netdev_priv(dev);
+	struct txbd8 *bdp, *next = NULL;
+	struct txbd8 *lbdp = NULL;
+	struct txbd8 *base = tx_queue->tx_bd_base;
+	struct sk_buff *skb;
+	int skb_dirtytx;
+	int tx_ring_size = tx_queue->tx_ring_size;
+	int frags = 0, nr_txbds = 0;
+	int i;
+	int howmany = 0;
+	int tqi = tx_queue->qindex;
+	unsigned int bytes_sent = 0;
+	u32 lstatus;
+	size_t buflen;
+
+	txq = netdev_get_tx_queue(dev, tqi);
+	bdp = tx_queue->dirty_tx;
+	skb_dirtytx = tx_queue->skb_dirtytx;
+
+	while ((skb = tx_queue->tx_skbuff[skb_dirtytx])) {
+		bool do_tstamp;
+
+		do_tstamp = (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
+			    priv->hwts_tx_en;
+
+		frags = skb_shinfo(skb)->nr_frags;
+
+		/* When time stamping, one additional TxBD must be freed.
+		 * Also, we need to dma_unmap_single() the TxPAL.
+		 */
+		if (unlikely(do_tstamp))
+			nr_txbds = frags + 2;
+		else
+			nr_txbds = frags + 1;
+
+		lbdp = skip_txbd(bdp, nr_txbds - 1, base, tx_ring_size);
+
+		lstatus = be32_to_cpu(lbdp->lstatus);
+
+		/* Only clean completed frames */
+		if ((lstatus & BD_LFLAG(TXBD_READY)) &&
+		    (lstatus & BD_LENGTH_MASK))
+			break;
+
+		if (unlikely(do_tstamp)) {
+			next = next_txbd(bdp, base, tx_ring_size);
+			buflen = be16_to_cpu(next->length) +
+				 GMAC_FCB_LEN + GMAC_TXPAL_LEN;
+		} else
+			buflen = be16_to_cpu(bdp->length);
+
+		dma_unmap_single(priv->dev, be32_to_cpu(bdp->bufPtr),
+				 buflen, DMA_TO_DEVICE);
+
+		if (unlikely(do_tstamp)) {
+			struct skb_shared_hwtstamps shhwtstamps;
+			u64 *ns = (u64 *)(((uintptr_t)skb->data + 0x10) &
+					  ~0x7UL);
+
+			memset(&shhwtstamps, 0, sizeof(shhwtstamps));
+			shhwtstamps.hwtstamp = ns_to_ktime(be64_to_cpu(*ns));
+			skb_pull(skb, GMAC_FCB_LEN + GMAC_TXPAL_LEN);
+			skb_tstamp_tx(skb, &shhwtstamps);
+			gfar_clear_txbd_status(bdp);
+			bdp = next;
+		}
+
+		gfar_clear_txbd_status(bdp);
+		bdp = next_txbd(bdp, base, tx_ring_size);
+
+		for (i = 0; i < frags; i++) {
+			dma_unmap_page(priv->dev, be32_to_cpu(bdp->bufPtr),
+				       be16_to_cpu(bdp->length),
+				       DMA_TO_DEVICE);
+			gfar_clear_txbd_status(bdp);
+			bdp = next_txbd(bdp, base, tx_ring_size);
+		}
+
+		bytes_sent += GFAR_CB(skb)->bytes_sent;
+
+		dev_kfree_skb_any(skb);
+
+		tx_queue->tx_skbuff[skb_dirtytx] = NULL;
+
+		skb_dirtytx = (skb_dirtytx + 1) &
+			      TX_RING_MOD_MASK(tx_ring_size);
+
+		howmany++;
+		spin_lock(&tx_queue->txlock);
+		tx_queue->num_txbdfree += nr_txbds;
+		spin_unlock(&tx_queue->txlock);
+	}
+
+	/* If we freed a buffer, we can restart transmission, if necessary */
+	if (tx_queue->num_txbdfree &&
+	    netif_tx_queue_stopped(txq) &&
+	    !(test_bit(GFAR_DOWN, &priv->state)))
+		netif_wake_subqueue(priv->ndev, tqi);
+
+	/* Update dirty indicators */
+	tx_queue->skb_dirtytx = skb_dirtytx;
+	tx_queue->dirty_tx = bdp;
+
+	netdev_tx_completed_queue(txq, howmany, bytes_sent);
+}
+
+static void count_errors(u32 lstatus, struct net_device *ndev)
+{
+	struct gfar_private *priv = netdev_priv(ndev);
+	struct net_device_stats *stats = &ndev->stats;
+	struct gfar_extra_stats *estats = &priv->extra_stats;
+
+	/* If the packet was truncated, none of the other errors matter */
+	if (lstatus & BD_LFLAG(RXBD_TRUNCATED)) {
+		stats->rx_length_errors++;
+
+		atomic64_inc(&estats->rx_trunc);
+
+		return;
+	}
+	/* Count the errors, if there were any */
+	if (lstatus & BD_LFLAG(RXBD_LARGE | RXBD_SHORT)) {
+		stats->rx_length_errors++;
+
+		if (lstatus & BD_LFLAG(RXBD_LARGE))
+			atomic64_inc(&estats->rx_large);
+		else
+			atomic64_inc(&estats->rx_short);
+	}
+	if (lstatus & BD_LFLAG(RXBD_NONOCTET)) {
+		stats->rx_frame_errors++;
+		atomic64_inc(&estats->rx_nonoctet);
+	}
+	if (lstatus & BD_LFLAG(RXBD_CRCERR)) {
+		atomic64_inc(&estats->rx_crcerr);
+		stats->rx_crc_errors++;
+	}
+	if (lstatus & BD_LFLAG(RXBD_OVERRUN)) {
+		atomic64_inc(&estats->rx_overrun);
+		stats->rx_over_errors++;
+	}
+}
+
+static irqreturn_t gfar_receive(int irq, void *grp_id)
+{
+	struct gfar_priv_grp *grp = (struct gfar_priv_grp *)grp_id;
+	unsigned long flags;
+	u32 imask, ievent;
+
+	ievent = gfar_read(&grp->regs->ievent);
+
+	if (unlikely(ievent & IEVENT_FGPI)) {
+		gfar_write(&grp->regs->ievent, IEVENT_FGPI);
+		return IRQ_HANDLED;
+	}
+
+	if (likely(napi_schedule_prep(&grp->napi_rx))) {
+		spin_lock_irqsave(&grp->grplock, flags);
+		imask = gfar_read(&grp->regs->imask);
+		imask &= IMASK_RX_DISABLED | grp->priv->rmon_overflow.imask;
+		gfar_write(&grp->regs->imask, imask);
+		spin_unlock_irqrestore(&grp->grplock, flags);
+		__napi_schedule(&grp->napi_rx);
+	} else {
+		/* Clear IEVENT, so interrupts aren't called again
+		 * because of the packets that have already arrived.
+		 */
+		gfar_write(&grp->regs->ievent, IEVENT_RX_MASK);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* Interrupt Handler for Transmit complete */
+static irqreturn_t gfar_transmit(int irq, void *grp_id)
+{
+	struct gfar_priv_grp *grp = (struct gfar_priv_grp *)grp_id;
+	unsigned long flags;
+	u32 imask;
+
+	if (likely(napi_schedule_prep(&grp->napi_tx))) {
+		spin_lock_irqsave(&grp->grplock, flags);
+		imask = gfar_read(&grp->regs->imask);
+		imask &= IMASK_TX_DISABLED | grp->priv->rmon_overflow.imask;
+		gfar_write(&grp->regs->imask, imask);
+		spin_unlock_irqrestore(&grp->grplock, flags);
+		__napi_schedule(&grp->napi_tx);
+	} else {
+		/* Clear IEVENT, so interrupts aren't called again
+		 * because of the packets that have already arrived.
+		 */
+		gfar_write(&grp->regs->ievent, IEVENT_TX_MASK);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static bool gfar_add_rx_frag(struct gfar_rx_buff *rxb, u32 lstatus,
+			     struct sk_buff *skb, bool first)
+{
+	int size = lstatus & BD_LENGTH_MASK;
+	struct page *page = rxb->page;
+
+	if (likely(first)) {
+		skb_put(skb, size);
+	} else {
+		/* the last fragments' length contains the full frame length */
+		if (lstatus & BD_LFLAG(RXBD_LAST))
+			size -= skb->len;
+
+		WARN(size < 0, "gianfar: rx fragment size underflow");
+		if (size < 0)
+			return false;
+
+		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
+				rxb->page_offset + RXBUF_ALIGNMENT,
+				size, GFAR_RXB_TRUESIZE);
+	}
+
+	/* try reuse page */
+	if (unlikely(page_count(page) != 1 || page_is_pfmemalloc(page)))
+		return false;
+
+	/* change offset to the other half */
+	rxb->page_offset ^= GFAR_RXB_TRUESIZE;
+
+	page_ref_inc(page);
+
+	return true;
+}
+
+static void gfar_reuse_rx_page(struct gfar_priv_rx_q *rxq,
+			       struct gfar_rx_buff *old_rxb)
+{
+	struct gfar_rx_buff *new_rxb;
+	u16 nta = rxq->next_to_alloc;
+
+	new_rxb = &rxq->rx_buff[nta];
+
+	/* find next buf that can reuse a page */
+	nta++;
+	rxq->next_to_alloc = (nta < rxq->rx_ring_size) ? nta : 0;
+
+	/* copy page reference */
+	*new_rxb = *old_rxb;
+
+	/* sync for use by the device */
+	dma_sync_single_range_for_device(rxq->dev, old_rxb->dma,
+					 old_rxb->page_offset,
+					 GFAR_RXB_TRUESIZE, DMA_FROM_DEVICE);
+}
+
+static struct sk_buff *gfar_get_next_rxbuff(struct gfar_priv_rx_q *rx_queue,
+					    u32 lstatus, struct sk_buff *skb)
+{
+	struct gfar_rx_buff *rxb = &rx_queue->rx_buff[rx_queue->next_to_clean];
+	struct page *page = rxb->page;
+	bool first = false;
+
+	if (likely(!skb)) {
+		void *buff_addr = page_address(page) + rxb->page_offset;
+
+		skb = build_skb(buff_addr, GFAR_SKBFRAG_SIZE);
+		if (unlikely(!skb)) {
+			gfar_rx_alloc_err(rx_queue);
+			return NULL;
+		}
+		skb_reserve(skb, RXBUF_ALIGNMENT);
+		first = true;
+	}
+
+	dma_sync_single_range_for_cpu(rx_queue->dev, rxb->dma, rxb->page_offset,
+				      GFAR_RXB_TRUESIZE, DMA_FROM_DEVICE);
+
+	if (gfar_add_rx_frag(rxb, lstatus, skb, first)) {
+		/* reuse the free half of the page */
+		gfar_reuse_rx_page(rx_queue, rxb);
+	} else {
+		/* page cannot be reused, unmap it */
+		dma_unmap_page(rx_queue->dev, rxb->dma,
+			       PAGE_SIZE, DMA_FROM_DEVICE);
+	}
+
+	/* clear rxb content */
+	rxb->page = NULL;
+
+	return skb;
+}
+
+static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
+{
+	/* If valid headers were found, and valid sums
+	 * were verified, then we tell the kernel that no
+	 * checksumming is necessary.  Otherwise, it is [FIXME]
+	 */
+	if ((be16_to_cpu(fcb->flags) & RXFCB_CSUM_MASK) ==
+	    (RXFCB_CIP | RXFCB_CTU))
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	else
+		skb_checksum_none_assert(skb);
+}
+
+/* gfar_process_frame() -- handle one incoming packet if skb isn't NULL. */
+static void gfar_process_frame(struct net_device *ndev, struct sk_buff *skb)
+{
+	struct gfar_private *priv = netdev_priv(ndev);
+	struct rxfcb *fcb = NULL;
+
+	/* fcb is at the beginning if exists */
+	fcb = (struct rxfcb *)skb->data;
+
+	/* Remove the FCB from the skb
+	 * Remove the padded bytes, if there are any
+	 */
+	if (priv->uses_rxfcb)
+		skb_pull(skb, GMAC_FCB_LEN);
+
+	/* Get receive timestamp from the skb */
+	if (priv->hwts_rx_en) {
+		struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
+		u64 *ns = (u64 *) skb->data;
+
+		memset(shhwtstamps, 0, sizeof(*shhwtstamps));
+		shhwtstamps->hwtstamp = ns_to_ktime(be64_to_cpu(*ns));
+	}
+
+	if (priv->padding)
+		skb_pull(skb, priv->padding);
+
+	/* Trim off the FCS */
+	pskb_trim(skb, skb->len - ETH_FCS_LEN);
+
+	if (ndev->features & NETIF_F_RXCSUM)
+		gfar_rx_checksum(skb, fcb);
+
+	/* There's need to check for NETIF_F_HW_VLAN_CTAG_RX here.
+	 * Even if vlan rx accel is disabled, on some chips
+	 * RXFCB_VLN is pseudo randomly set.
+	 */
+	if (ndev->features & NETIF_F_HW_VLAN_CTAG_RX &&
+	    be16_to_cpu(fcb->flags) & RXFCB_VLN)
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+				       be16_to_cpu(fcb->vlctl));
+}
+
+/* gfar_clean_rx_ring() -- Processes each frame in the rx ring
+ * until the budget/quota has been reached. Returns the number
+ * of frames handled
+ */
+static int gfar_clean_rx_ring(struct gfar_priv_rx_q *rx_queue,
+			      int rx_work_limit)
+{
+	struct net_device *ndev = rx_queue->ndev;
+	struct gfar_private *priv = netdev_priv(ndev);
+	struct rxbd8 *bdp;
+	int i, howmany = 0;
+	struct sk_buff *skb = rx_queue->skb;
+	int cleaned_cnt = gfar_rxbd_unused(rx_queue);
+	unsigned int total_bytes = 0, total_pkts = 0;
+
+	/* Get the first full descriptor */
+	i = rx_queue->next_to_clean;
+
+	while (rx_work_limit--) {
+		u32 lstatus;
+
+		if (cleaned_cnt >= GFAR_RX_BUFF_ALLOC) {
+			gfar_alloc_rx_buffs(rx_queue, cleaned_cnt);
+			cleaned_cnt = 0;
+		}
+
+		bdp = &rx_queue->rx_bd_base[i];
+		lstatus = be32_to_cpu(bdp->lstatus);
+		if (lstatus & BD_LFLAG(RXBD_EMPTY))
+			break;
+
+		/* lost RXBD_LAST descriptor due to overrun */
+		if (skb &&
+		    (lstatus & BD_LFLAG(RXBD_FIRST))) {
+			/* discard faulty buffer */
+			dev_kfree_skb(skb);
+			skb = NULL;
+			rx_queue->stats.rx_dropped++;
+
+			/* can continue normally */
+		}
+
+		/* order rx buffer descriptor reads */
+		rmb();
+
+		/* fetch next to clean buffer from the ring */
+		skb = gfar_get_next_rxbuff(rx_queue, lstatus, skb);
+		if (unlikely(!skb))
+			break;
+
+		cleaned_cnt++;
+		howmany++;
+
+		if (unlikely(++i == rx_queue->rx_ring_size))
+			i = 0;
+
+		rx_queue->next_to_clean = i;
+
+		/* fetch next buffer if not the last in frame */
+		if (!(lstatus & BD_LFLAG(RXBD_LAST)))
+			continue;
+
+		if (unlikely(lstatus & BD_LFLAG(RXBD_ERR))) {
+			count_errors(lstatus, ndev);
+
+			/* discard faulty buffer */
+			dev_kfree_skb(skb);
+			skb = NULL;
+			rx_queue->stats.rx_dropped++;
+			continue;
+		}
+
+		gfar_process_frame(ndev, skb);
+
+		/* Increment the number of packets */
+		total_pkts++;
+		total_bytes += skb->len;
+
+		skb_record_rx_queue(skb, rx_queue->qindex);
+
+		skb->protocol = eth_type_trans(skb, ndev);
+
+		/* Send the packet up the stack */
+		napi_gro_receive(&rx_queue->grp->napi_rx, skb);
+
+		skb = NULL;
+	}
+
+	/* Store incomplete frames for completion */
+	rx_queue->skb = skb;
+
+	rx_queue->stats.rx_packets += total_pkts;
+	rx_queue->stats.rx_bytes += total_bytes;
+
+	if (cleaned_cnt)
+		gfar_alloc_rx_buffs(rx_queue, cleaned_cnt);
+
+	/* Update Last Free RxBD pointer for LFC */
+	if (unlikely(priv->tx_actual_en)) {
+		u32 bdp_dma = gfar_rxbd_dma_lastfree(rx_queue);
+
+		gfar_write(rx_queue->rfbptr, bdp_dma);
+	}
+
+	return howmany;
+}
+
+static int gfar_poll_rx_sq(struct napi_struct *napi, int budget)
+{
+	struct gfar_priv_grp *gfargrp =
+		container_of(napi, struct gfar_priv_grp, napi_rx);
+	struct gfar __iomem *regs = gfargrp->regs;
+	struct gfar_priv_rx_q *rx_queue = gfargrp->rx_queue;
+	int work_done = 0;
+
+	/* Clear IEVENT, so interrupts aren't called again
+	 * because of the packets that have already arrived
+	 */
+	gfar_write(&regs->ievent, IEVENT_RX_MASK);
+
+	work_done = gfar_clean_rx_ring(rx_queue, budget);
+
+	if (work_done < budget) {
+		u32 imask;
+		napi_complete_done(napi, work_done);
+		/* Clear the halt bit in RSTAT */
+		gfar_write(&regs->rstat, gfargrp->rstat);
+
+		spin_lock_irq(&gfargrp->grplock);
+		imask = gfar_read(&regs->imask);
+		imask |= IMASK_RX_DEFAULT;
+		gfar_write(&regs->imask, imask);
+		spin_unlock_irq(&gfargrp->grplock);
+	}
+
+	return work_done;
+}
+
+static int gfar_poll_tx_sq(struct napi_struct *napi, int budget)
+{
+	struct gfar_priv_grp *gfargrp =
+		container_of(napi, struct gfar_priv_grp, napi_tx);
+	struct gfar __iomem *regs = gfargrp->regs;
+	struct gfar_priv_tx_q *tx_queue = gfargrp->tx_queue;
+	u32 imask;
+
+	/* Clear IEVENT, so interrupts aren't called again
+	 * because of the packets that have already arrived
+	 */
+	gfar_write(&regs->ievent, IEVENT_TX_MASK);
+
+	/* run Tx cleanup to completion */
+	if (tx_queue->tx_skbuff[tx_queue->skb_dirtytx])
+		gfar_clean_tx_ring(tx_queue);
+
+	napi_complete(napi);
+
+	spin_lock_irq(&gfargrp->grplock);
+	imask = gfar_read(&regs->imask);
+	imask |= IMASK_TX_DEFAULT;
+	gfar_write(&regs->imask, imask);
+	spin_unlock_irq(&gfargrp->grplock);
+
+	return 0;
+}
+
+/* GFAR error interrupt handler */
+static irqreturn_t gfar_error(int irq, void *grp_id)
+{
+	struct gfar_priv_grp *gfargrp = grp_id;
+	struct gfar __iomem *regs = gfargrp->regs;
+	struct gfar_private *priv= gfargrp->priv;
+	struct net_device *dev = priv->ndev;
+
+	/* Save ievent for future reference */
+	u32 events = gfar_read(&regs->ievent);
+
+	/* Clear IEVENT */
+	gfar_write(&regs->ievent, events & IEVENT_ERR_MASK);
+
+	/* Magic Packet is not an error. */
+	if ((priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET) &&
+	    (events & IEVENT_MAG))
+		events &= ~IEVENT_MAG;
+
+	/* Hmm... */
+	if (netif_msg_rx_err(priv) || netif_msg_tx_err(priv))
+		netdev_dbg(dev,
+			   "error interrupt (ievent=0x%08x imask=0x%08x)\n",
+			   events, gfar_read(&regs->imask));
+
+	/* Update the error counters */
+	if (events & IEVENT_TXE) {
+		dev->stats.tx_errors++;
+
+		if (events & IEVENT_LC)
+			dev->stats.tx_window_errors++;
+		if (events & IEVENT_CRL)
+			dev->stats.tx_aborted_errors++;
+		if (events & IEVENT_XFUN) {
+			netif_dbg(priv, tx_err, dev,
+				  "TX FIFO underrun, packet dropped\n");
+			dev->stats.tx_dropped++;
+			atomic64_inc(&priv->extra_stats.tx_underrun);
+
+			schedule_work(&priv->reset_task);
+		}
+		netif_dbg(priv, tx_err, dev, "Transmit Error\n");
+	}
+	if (events & IEVENT_MSRO) {
+		struct rmon_mib __iomem *rmon = &regs->rmon;
+		u32 car;
+
+		spin_lock(&priv->rmon_overflow.lock);
+		car = gfar_read(&rmon->car1) & CAR1_C1RDR;
+		if (car) {
+			priv->rmon_overflow.rdrp++;
+			gfar_write(&rmon->car1, car);
+		}
+		spin_unlock(&priv->rmon_overflow.lock);
+	}
+	if (events & IEVENT_BSY) {
+		dev->stats.rx_over_errors++;
+		atomic64_inc(&priv->extra_stats.rx_bsy);
+
+		netif_dbg(priv, rx_err, dev, "busy error (rstat: %x)\n",
+			  gfar_read(&regs->rstat));
+	}
+	if (events & IEVENT_BABR) {
+		dev->stats.rx_errors++;
+		atomic64_inc(&priv->extra_stats.rx_babr);
+
+		netif_dbg(priv, rx_err, dev, "babbling RX error\n");
+	}
+	if (events & IEVENT_EBERR) {
+		atomic64_inc(&priv->extra_stats.eberr);
+		netif_dbg(priv, rx_err, dev, "bus error\n");
+	}
+	if (events & IEVENT_RXC)
+		netif_dbg(priv, rx_status, dev, "control frame\n");
+
+	if (events & IEVENT_BABT) {
+		atomic64_inc(&priv->extra_stats.tx_babt);
+		netif_dbg(priv, tx_err, dev, "babbling TX error\n");
+	}
+	return IRQ_HANDLED;
+}
+
+/* The interrupt handler for devices with one interrupt */
+static irqreturn_t gfar_interrupt(int irq, void *grp_id)
+{
+	struct gfar_priv_grp *gfargrp = grp_id;
+
+	/* Save ievent for future reference */
+	u32 events = gfar_read(&gfargrp->regs->ievent);
+
+	/* Check for reception */
+	if (events & IEVENT_RX_MASK)
+		gfar_receive(irq, grp_id);
+
+	/* Check for transmit completion */
+	if (events & IEVENT_TX_MASK)
+		gfar_transmit(irq, grp_id);
+
+	/* Check for errors */
+	if (events & IEVENT_ERR_MASK)
+		gfar_error(irq, grp_id);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+static void gfar_netpoll(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	int i;
+
+	/* If the device has multiple interrupts, run tx/rx */
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+		for (i = 0; i < priv->num_grps; i++) {
+			struct gfar_priv_grp *grp = &priv->gfargrp[i];
+
+			disable_irq(gfar_irq(grp, TX)->irq);
+			disable_irq(gfar_irq(grp, RX)->irq);
+			disable_irq(gfar_irq(grp, ER)->irq);
+			gfar_interrupt(gfar_irq(grp, TX)->irq, grp);
+			enable_irq(gfar_irq(grp, ER)->irq);
+			enable_irq(gfar_irq(grp, RX)->irq);
+			enable_irq(gfar_irq(grp, TX)->irq);
+		}
+	} else {
+		for (i = 0; i < priv->num_grps; i++) {
+			struct gfar_priv_grp *grp = &priv->gfargrp[i];
+
+			disable_irq(gfar_irq(grp, TX)->irq);
+			gfar_interrupt(gfar_irq(grp, TX)->irq, grp);
+			enable_irq(gfar_irq(grp, TX)->irq);
+		}
+	}
+}
+#endif
+
+static void free_grp_irqs(struct gfar_priv_grp *grp)
+{
+	free_irq(gfar_irq(grp, TX)->irq, grp);
+	free_irq(gfar_irq(grp, RX)->irq, grp);
+	free_irq(gfar_irq(grp, ER)->irq, grp);
+}
+
+static int register_grp_irqs(struct gfar_priv_grp *grp)
+{
+	struct gfar_private *priv = grp->priv;
+	struct net_device *dev = priv->ndev;
+	int err;
+
+	/* If the device has multiple interrupts, register for
+	 * them.  Otherwise, only register for the one
+	 */
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+		/* Install our interrupt handlers for Error,
+		 * Transmit, and Receive
+		 */
+		err = request_irq(gfar_irq(grp, ER)->irq, gfar_error, 0,
+				  gfar_irq(grp, ER)->name, grp);
+		if (err < 0) {
+			netif_err(priv, intr, dev, "Can't get IRQ %d\n",
+				  gfar_irq(grp, ER)->irq);
+
+			goto err_irq_fail;
+		}
+		enable_irq_wake(gfar_irq(grp, ER)->irq);
+
+		err = request_irq(gfar_irq(grp, TX)->irq, gfar_transmit, 0,
+				  gfar_irq(grp, TX)->name, grp);
+		if (err < 0) {
+			netif_err(priv, intr, dev, "Can't get IRQ %d\n",
+				  gfar_irq(grp, TX)->irq);
+			goto tx_irq_fail;
+		}
+		err = request_irq(gfar_irq(grp, RX)->irq, gfar_receive, 0,
+				  gfar_irq(grp, RX)->name, grp);
+		if (err < 0) {
+			netif_err(priv, intr, dev, "Can't get IRQ %d\n",
+				  gfar_irq(grp, RX)->irq);
+			goto rx_irq_fail;
+		}
+		enable_irq_wake(gfar_irq(grp, RX)->irq);
+
+	} else {
+		err = request_irq(gfar_irq(grp, TX)->irq, gfar_interrupt, 0,
+				  gfar_irq(grp, TX)->name, grp);
+		if (err < 0) {
+			netif_err(priv, intr, dev, "Can't get IRQ %d\n",
+				  gfar_irq(grp, TX)->irq);
+			goto err_irq_fail;
+		}
+		enable_irq_wake(gfar_irq(grp, TX)->irq);
+	}
+
+	return 0;
+
+rx_irq_fail:
+	free_irq(gfar_irq(grp, TX)->irq, grp);
+tx_irq_fail:
+	free_irq(gfar_irq(grp, ER)->irq, grp);
+err_irq_fail:
+	return err;
+
+}
+
+static void gfar_free_irq(struct gfar_private *priv)
+{
+	int i;
+
+	/* Free the IRQs */
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+		for (i = 0; i < priv->num_grps; i++)
+			free_grp_irqs(&priv->gfargrp[i]);
+	} else {
+		for (i = 0; i < priv->num_grps; i++)
+			free_irq(gfar_irq(&priv->gfargrp[i], TX)->irq,
+				 &priv->gfargrp[i]);
+	}
+}
+
+static int gfar_request_irq(struct gfar_private *priv)
+{
+	int err, i, j;
+
+	for (i = 0; i < priv->num_grps; i++) {
+		err = register_grp_irqs(&priv->gfargrp[i]);
+		if (err) {
+			for (j = 0; j < i; j++)
+				free_grp_irqs(&priv->gfargrp[j]);
+			return err;
+		}
+	}
+
+	return 0;
+}
+
+/* Called when something needs to use the ethernet device
+ * Returns 0 for success.
+ */
+static int gfar_enet_open(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	int err;
+
+	err = init_phy(dev);
+	if (err)
+		return err;
+
+	err = gfar_request_irq(priv);
+	if (err)
+		return err;
+
+	err = startup_gfar(dev);
+	if (err)
+		return err;
+
+	return err;
+}
+
+/* Stops the kernel queue, and halts the controller */
+static int gfar_close(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	cancel_work_sync(&priv->reset_task);
+	stop_gfar(dev);
+
+	/* Disconnect from the PHY */
+	phy_disconnect(dev->phydev);
+
+	gfar_free_irq(priv);
+
+	return 0;
+}
+
+/* Clears each of the exact match registers to zero, so they
+ * don't interfere with normal reception
+ */
+static void gfar_clear_exact_match(struct net_device *dev)
+{
+	int idx;
+	static const u8 zero_arr[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
+
+	for (idx = 1; idx < GFAR_EM_NUM + 1; idx++)
+		gfar_set_mac_for_addr(dev, idx, zero_arr);
+}
+
+/* Update the hash table based on the current list of multicast
+ * addresses we subscribe to.  Also, change the promiscuity of
+ * the device based on the flags (this function is called
+ * whenever dev->flags is changed
+ */
+static void gfar_set_multi(struct net_device *dev)
+{
+	struct netdev_hw_addr *ha;
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+
+	if (dev->flags & IFF_PROMISC) {
+		/* Set RCTRL to PROM */
+		tempval = gfar_read(&regs->rctrl);
+		tempval |= RCTRL_PROM;
+		gfar_write(&regs->rctrl, tempval);
+	} else {
+		/* Set RCTRL to not PROM */
+		tempval = gfar_read(&regs->rctrl);
+		tempval &= ~(RCTRL_PROM);
+		gfar_write(&regs->rctrl, tempval);
+	}
+
+	if (dev->flags & IFF_ALLMULTI) {
+		/* Set the hash to rx all multicast frames */
+		gfar_write(&regs->igaddr0, 0xffffffff);
+		gfar_write(&regs->igaddr1, 0xffffffff);
+		gfar_write(&regs->igaddr2, 0xffffffff);
+		gfar_write(&regs->igaddr3, 0xffffffff);
+		gfar_write(&regs->igaddr4, 0xffffffff);
+		gfar_write(&regs->igaddr5, 0xffffffff);
+		gfar_write(&regs->igaddr6, 0xffffffff);
+		gfar_write(&regs->igaddr7, 0xffffffff);
+		gfar_write(&regs->gaddr0, 0xffffffff);
+		gfar_write(&regs->gaddr1, 0xffffffff);
+		gfar_write(&regs->gaddr2, 0xffffffff);
+		gfar_write(&regs->gaddr3, 0xffffffff);
+		gfar_write(&regs->gaddr4, 0xffffffff);
+		gfar_write(&regs->gaddr5, 0xffffffff);
+		gfar_write(&regs->gaddr6, 0xffffffff);
+		gfar_write(&regs->gaddr7, 0xffffffff);
+	} else {
+		int em_num;
+		int idx;
+
+		/* zero out the hash */
+		gfar_write(&regs->igaddr0, 0x0);
+		gfar_write(&regs->igaddr1, 0x0);
+		gfar_write(&regs->igaddr2, 0x0);
+		gfar_write(&regs->igaddr3, 0x0);
+		gfar_write(&regs->igaddr4, 0x0);
+		gfar_write(&regs->igaddr5, 0x0);
+		gfar_write(&regs->igaddr6, 0x0);
+		gfar_write(&regs->igaddr7, 0x0);
+		gfar_write(&regs->gaddr0, 0x0);
+		gfar_write(&regs->gaddr1, 0x0);
+		gfar_write(&regs->gaddr2, 0x0);
+		gfar_write(&regs->gaddr3, 0x0);
+		gfar_write(&regs->gaddr4, 0x0);
+		gfar_write(&regs->gaddr5, 0x0);
+		gfar_write(&regs->gaddr6, 0x0);
+		gfar_write(&regs->gaddr7, 0x0);
+
+		/* If we have extended hash tables, we need to
+		 * clear the exact match registers to prepare for
+		 * setting them
+		 */
+		if (priv->extended_hash) {
+			em_num = GFAR_EM_NUM + 1;
+			gfar_clear_exact_match(dev);
+			idx = 1;
+		} else {
+			idx = 0;
+			em_num = 0;
+		}
+
+		if (netdev_mc_empty(dev))
+			return;
+
+		/* Parse the list, and set the appropriate bits */
+		netdev_for_each_mc_addr(ha, dev) {
+			if (idx < em_num) {
+				gfar_set_mac_for_addr(dev, idx, ha->addr);
+				idx++;
+			} else
+				gfar_set_hash_for_addr(dev, ha->addr);
+		}
+	}
+}
+
+void gfar_mac_reset(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+
+	/* Reset MAC layer */
+	gfar_write(&regs->maccfg1, MACCFG1_SOFT_RESET);
+
+	/* We need to delay at least 3 TX clocks */
+	udelay(3);
+
+	/* the soft reset bit is not self-resetting, so we need to
+	 * clear it before resuming normal operation
+	 */
+	gfar_write(&regs->maccfg1, 0);
+
+	udelay(3);
+
+	gfar_rx_offload_en(priv);
+
+	/* Initialize the max receive frame/buffer lengths */
+	gfar_write(&regs->maxfrm, GFAR_JUMBO_FRAME_SIZE);
+	gfar_write(&regs->mrblr, GFAR_RXB_SIZE);
+
+	/* Initialize the Minimum Frame Length Register */
+	gfar_write(&regs->minflr, MINFLR_INIT_SETTINGS);
+
+	/* Initialize MACCFG2. */
+	tempval = MACCFG2_INIT_SETTINGS;
+
+	/* eTSEC74 erratum: Rx frames of length MAXFRM or MAXFRM-1
+	 * are marked as truncated.  Avoid this by MACCFG2[Huge Frame]=1,
+	 * and by checking RxBD[LG] and discarding larger than MAXFRM.
+	 */
+	if (gfar_has_errata(priv, GFAR_ERRATA_74))
+		tempval |= MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK;
+
+	gfar_write(&regs->maccfg2, tempval);
+
+	/* Clear mac addr hash registers */
+	gfar_write(&regs->igaddr0, 0);
+	gfar_write(&regs->igaddr1, 0);
+	gfar_write(&regs->igaddr2, 0);
+	gfar_write(&regs->igaddr3, 0);
+	gfar_write(&regs->igaddr4, 0);
+	gfar_write(&regs->igaddr5, 0);
+	gfar_write(&regs->igaddr6, 0);
+	gfar_write(&regs->igaddr7, 0);
+
+	gfar_write(&regs->gaddr0, 0);
+	gfar_write(&regs->gaddr1, 0);
+	gfar_write(&regs->gaddr2, 0);
+	gfar_write(&regs->gaddr3, 0);
+	gfar_write(&regs->gaddr4, 0);
+	gfar_write(&regs->gaddr5, 0);
+	gfar_write(&regs->gaddr6, 0);
+	gfar_write(&regs->gaddr7, 0);
+
+	if (priv->extended_hash)
+		gfar_clear_exact_match(priv->ndev);
+
+	gfar_mac_rx_config(priv);
+
+	gfar_mac_tx_config(priv);
+
+	gfar_set_mac_address(priv->ndev);
+
+	gfar_set_multi(priv->ndev);
+
+	/* clear ievent and imask before configuring coalescing */
+	gfar_ints_disable(priv);
+
+	/* Configure the coalescing support */
+	gfar_configure_coalescing_all(priv);
+}
+
+static void gfar_hw_init(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 attrs;
+
+	/* Stop the DMA engine now, in case it was running before
+	 * (The firmware could have used it, and left it running).
+	 */
+	gfar_halt(priv);
+
+	gfar_mac_reset(priv);
+
+	/* Zero out the rmon mib registers if it has them */
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
+		memset_io(&regs->rmon, 0, offsetof(struct rmon_mib, car1));
+
+		/* Mask off the CAM interrupts */
+		gfar_write(&regs->rmon.cam1, 0xffffffff);
+		gfar_write(&regs->rmon.cam2, 0xffffffff);
+		/* Clear the CAR registers (w1c style) */
+		gfar_write(&regs->rmon.car1, 0xffffffff);
+		gfar_write(&regs->rmon.car2, 0xffffffff);
+	}
+
+	/* Initialize ECNTRL */
+	gfar_write(&regs->ecntrl, ECNTRL_INIT_SETTINGS);
+
+	/* Set the extraction length and index */
+	attrs = ATTRELI_EL(priv->rx_stash_size) |
+		ATTRELI_EI(priv->rx_stash_index);
+
+	gfar_write(&regs->attreli, attrs);
+
+	/* Start with defaults, and add stashing
+	 * depending on driver parameters
+	 */
+	attrs = ATTR_INIT_SETTINGS;
+
+	if (priv->bd_stash_en)
+		attrs |= ATTR_BDSTASH;
+
+	if (priv->rx_stash_size != 0)
+		attrs |= ATTR_BUFSTASH;
+
+	gfar_write(&regs->attr, attrs);
+
+	/* FIFO configs */
+	gfar_write(&regs->fifo_tx_thr, DEFAULT_FIFO_TX_THR);
+	gfar_write(&regs->fifo_tx_starve, DEFAULT_FIFO_TX_STARVE);
+	gfar_write(&regs->fifo_tx_starve_shutoff, DEFAULT_FIFO_TX_STARVE_OFF);
+
+	/* Program the interrupt steering regs, only for MG devices */
+	if (priv->num_grps > 1)
+		gfar_write_isrg(priv);
+}
+
+static const struct net_device_ops gfar_netdev_ops = {
+	.ndo_open = gfar_enet_open,
+	.ndo_start_xmit = gfar_start_xmit,
+	.ndo_stop = gfar_close,
+	.ndo_change_mtu = gfar_change_mtu,
+	.ndo_set_features = gfar_set_features,
+	.ndo_set_rx_mode = gfar_set_multi,
+	.ndo_tx_timeout = gfar_timeout,
+	.ndo_eth_ioctl = gfar_ioctl,
+	.ndo_get_stats64 = gfar_get_stats64,
+	.ndo_change_carrier = fixed_phy_change_carrier,
+	.ndo_set_mac_address = gfar_set_mac_addr,
+	.ndo_validate_addr = eth_validate_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller = gfar_netpoll,
+#endif
+};
+
+/* Set up the ethernet device structure, private data,
+ * and anything else we need before we start
+ */
+static int gfar_probe(struct platform_device *ofdev)
+{
+	struct device_node *np = ofdev->dev.of_node;
+	struct net_device *dev = NULL;
+	struct gfar_private *priv = NULL;
+	int err = 0, i;
+
+	err = gfar_of_init(ofdev, &dev);
+
+	if (err)
+		return err;
+
+	priv = netdev_priv(dev);
+	priv->ndev = dev;
+	priv->ofdev = ofdev;
+	priv->dev = &ofdev->dev;
+	SET_NETDEV_DEV(dev, &ofdev->dev);
+
+	INIT_WORK(&priv->reset_task, gfar_reset_task);
+
+	platform_set_drvdata(ofdev, priv);
+
+	gfar_detect_errata(priv);
+
+	/* Set the dev->base_addr to the gfar reg region */
+	dev->base_addr = (unsigned long) priv->gfargrp[0].regs;
+
+	/* Fill in the dev structure */
+	dev->watchdog_timeo = TX_TIMEOUT;
+	/* MTU range: 50 - 9586 */
+	dev->mtu = 1500;
+	dev->min_mtu = 50;
+	dev->max_mtu = GFAR_JUMBO_FRAME_SIZE - ETH_HLEN;
+	dev->netdev_ops = &gfar_netdev_ops;
+	dev->ethtool_ops = &gfar_ethtool_ops;
+
+	/* Register for napi ...We are registering NAPI for each grp */
+	for (i = 0; i < priv->num_grps; i++) {
+		netif_napi_add(dev, &priv->gfargrp[i].napi_rx,
+			       gfar_poll_rx_sq);
+		netif_napi_add_tx_weight(dev, &priv->gfargrp[i].napi_tx,
+					 gfar_poll_tx_sq, 2);
+	}
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_CSUM) {
+		dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG |
+				   NETIF_F_RXCSUM;
+		dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG |
+				 NETIF_F_RXCSUM | NETIF_F_HIGHDMA;
+	}
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_VLAN) {
+		dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX |
+				    NETIF_F_HW_VLAN_CTAG_RX;
+		dev->features |= NETIF_F_HW_VLAN_CTAG_RX;
+	}
+
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
+
+	gfar_init_addr_hash_table(priv);
+
+	/* Insert receive time stamps into padding alignment bytes, and
+	 * plus 2 bytes padding to ensure the cpu alignment.
+	 */
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_TIMER)
+		priv->padding = 8 + DEFAULT_PADDING;
+
+	if (dev->features & NETIF_F_IP_CSUM ||
+	    priv->device_flags & FSL_GIANFAR_DEV_HAS_TIMER)
+		dev->needed_headroom = GMAC_FCB_LEN + GMAC_TXPAL_LEN;
+
+	/* Initializing some of the rx/tx queue level parameters */
+	for (i = 0; i < priv->num_tx_queues; i++) {
+		priv->tx_queue[i]->tx_ring_size = DEFAULT_TX_RING_SIZE;
+		priv->tx_queue[i]->num_txbdfree = DEFAULT_TX_RING_SIZE;
+		priv->tx_queue[i]->txcoalescing = DEFAULT_TX_COALESCE;
+		priv->tx_queue[i]->txic = DEFAULT_TXIC;
+	}
+
+	for (i = 0; i < priv->num_rx_queues; i++) {
+		priv->rx_queue[i]->rx_ring_size = DEFAULT_RX_RING_SIZE;
+		priv->rx_queue[i]->rxcoalescing = DEFAULT_RX_COALESCE;
+		priv->rx_queue[i]->rxic = DEFAULT_RXIC;
+	}
+
+	/* Always enable rx filer if available */
+	priv->rx_filer_enable =
+	    (priv->device_flags & FSL_GIANFAR_DEV_HAS_RX_FILER) ? 1 : 0;
+	/* Enable most messages by default */
+	priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
+	/* use pritority h/w tx queue scheduling for single queue devices */
+	if (priv->num_tx_queues == 1)
+		priv->prio_sched_en = 1;
+
+	set_bit(GFAR_DOWN, &priv->state);
+
+	gfar_hw_init(priv);
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
+		struct rmon_mib __iomem *rmon = &priv->gfargrp[0].regs->rmon;
+
+		spin_lock_init(&priv->rmon_overflow.lock);
+		priv->rmon_overflow.imask = IMASK_MSRO;
+		gfar_write(&rmon->cam1, gfar_read(&rmon->cam1) & ~CAM1_M1RDR);
+	}
+
+	/* Carrier starts down, phylib will bring it up */
+	netif_carrier_off(dev);
+
+	err = register_netdev(dev);
+
+	if (err) {
+		pr_err("%s: Cannot register net device, aborting\n", dev->name);
+		goto register_fail;
+	}
+
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET)
+		priv->wol_supported |= GFAR_WOL_MAGIC;
+
+	if ((priv->device_flags & FSL_GIANFAR_DEV_HAS_WAKE_ON_FILER) &&
+	    priv->rx_filer_enable)
+		priv->wol_supported |= GFAR_WOL_FILER_UCAST;
+
+	device_set_wakeup_capable(&ofdev->dev, priv->wol_supported);
+
+	/* fill out IRQ number and name fields */
+	for (i = 0; i < priv->num_grps; i++) {
+		struct gfar_priv_grp *grp = &priv->gfargrp[i];
+		if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+			sprintf(gfar_irq(grp, TX)->name, "%s%s%c%s",
+				dev->name, "_g", '0' + i, "_tx");
+			sprintf(gfar_irq(grp, RX)->name, "%s%s%c%s",
+				dev->name, "_g", '0' + i, "_rx");
+			sprintf(gfar_irq(grp, ER)->name, "%s%s%c%s",
+				dev->name, "_g", '0' + i, "_er");
+		} else
+			strcpy(gfar_irq(grp, TX)->name, dev->name);
+	}
+
+	/* Initialize the filer table */
+	gfar_init_filer_table(priv);
+
+	/* Print out the device info */
+	netdev_info(dev, "mac: %pM\n", dev->dev_addr);
+
+	/* Even more device info helps when determining which kernel
+	 * provided which set of benchmarks.
+	 */
+	netdev_info(dev, "Running with NAPI enabled\n");
+	for (i = 0; i < priv->num_rx_queues; i++)
+		netdev_info(dev, "RX BD ring size for Q[%d]: %d\n",
+			    i, priv->rx_queue[i]->rx_ring_size);
+	for (i = 0; i < priv->num_tx_queues; i++)
+		netdev_info(dev, "TX BD ring size for Q[%d]: %d\n",
+			    i, priv->tx_queue[i]->tx_ring_size);
+
+	return 0;
+
+register_fail:
+	if (of_phy_is_fixed_link(np))
+		of_phy_deregister_fixed_link(np);
+	unmap_group_regs(priv);
+	gfar_free_rx_queues(priv);
+	gfar_free_tx_queues(priv);
+	of_node_put(priv->phy_node);
+	of_node_put(priv->tbi_node);
+	free_gfar_dev(priv);
+	return err;
+}
+
+static int gfar_remove(struct platform_device *ofdev)
+{
+	struct gfar_private *priv = platform_get_drvdata(ofdev);
+	struct device_node *np = ofdev->dev.of_node;
+
+	of_node_put(priv->phy_node);
+	of_node_put(priv->tbi_node);
+
+	unregister_netdev(priv->ndev);
+
+	if (of_phy_is_fixed_link(np))
+		of_phy_deregister_fixed_link(np);
+
+	unmap_group_regs(priv);
+	gfar_free_rx_queues(priv);
+	gfar_free_tx_queues(priv);
+	free_gfar_dev(priv);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static void __gfar_filer_disable(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 temp;
+
+	temp = gfar_read(&regs->rctrl);
+	temp &= ~(RCTRL_FILREN | RCTRL_PRSDEP_INIT);
+	gfar_write(&regs->rctrl, temp);
+}
+
+static void __gfar_filer_enable(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 temp;
+
+	temp = gfar_read(&regs->rctrl);
+	temp |= RCTRL_FILREN | RCTRL_PRSDEP_INIT;
+	gfar_write(&regs->rctrl, temp);
+}
+
+/* Filer rules implementing wol capabilities */
+static void gfar_filer_config_wol(struct gfar_private *priv)
+{
+	unsigned int i;
+	u32 rqfcr;
+
+	__gfar_filer_disable(priv);
+
+	/* clear the filer table, reject any packet by default */
+	rqfcr = RQFCR_RJE | RQFCR_CMP_MATCH;
+	for (i = 0; i <= MAX_FILER_IDX; i++)
+		gfar_write_filer(priv, i, rqfcr, 0);
+
+	i = 0;
+	if (priv->wol_opts & GFAR_WOL_FILER_UCAST) {
+		/* unicast packet, accept it */
+		struct net_device *ndev = priv->ndev;
+		/* get the default rx queue index */
+		u8 qindex = (u8)priv->gfargrp[0].rx_queue->qindex;
+		u32 dest_mac_addr = (ndev->dev_addr[0] << 16) |
+				    (ndev->dev_addr[1] << 8) |
+				     ndev->dev_addr[2];
+
+		rqfcr = (qindex << 10) | RQFCR_AND |
+			RQFCR_CMP_EXACT | RQFCR_PID_DAH;
+
+		gfar_write_filer(priv, i++, rqfcr, dest_mac_addr);
+
+		dest_mac_addr = (ndev->dev_addr[3] << 16) |
+				(ndev->dev_addr[4] << 8) |
+				 ndev->dev_addr[5];
+		rqfcr = (qindex << 10) | RQFCR_GPI |
+			RQFCR_CMP_EXACT | RQFCR_PID_DAL;
+		gfar_write_filer(priv, i++, rqfcr, dest_mac_addr);
+	}
+
+	__gfar_filer_enable(priv);
+}
+
+static void gfar_filer_restore_table(struct gfar_private *priv)
+{
+	u32 rqfcr, rqfpr;
+	unsigned int i;
+
+	__gfar_filer_disable(priv);
+
+	for (i = 0; i <= MAX_FILER_IDX; i++) {
+		rqfcr = priv->ftp_rqfcr[i];
+		rqfpr = priv->ftp_rqfpr[i];
+		gfar_write_filer(priv, i, rqfcr, rqfpr);
+	}
+
+	__gfar_filer_enable(priv);
+}
+
+/* gfar_start() for Rx only and with the FGPI filer interrupt enabled */
+static void gfar_start_wol_filer(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	int i = 0;
+
+	/* Enable Rx hw queues */
+	gfar_write(&regs->rqueue, priv->rqueue);
+
+	/* Initialize DMACTRL to have WWR and WOP */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval |= DMACTRL_INIT_SETTINGS;
+	gfar_write(&regs->dmactrl, tempval);
+
+	/* Make sure we aren't stopped */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval &= ~DMACTRL_GRS;
+	gfar_write(&regs->dmactrl, tempval);
+
+	for (i = 0; i < priv->num_grps; i++) {
+		regs = priv->gfargrp[i].regs;
+		/* Clear RHLT, so that the DMA starts polling now */
+		gfar_write(&regs->rstat, priv->gfargrp[i].rstat);
+		/* enable the Filer General Purpose Interrupt */
+		gfar_write(&regs->imask, IMASK_FGPI);
+	}
+
+	/* Enable Rx DMA */
+	tempval = gfar_read(&regs->maccfg1);
+	tempval |= MACCFG1_RX_EN;
+	gfar_write(&regs->maccfg1, tempval);
+}
+
+static int gfar_suspend(struct device *dev)
+{
+	struct gfar_private *priv = dev_get_drvdata(dev);
+	struct net_device *ndev = priv->ndev;
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	u16 wol = priv->wol_opts;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	disable_napi(priv);
+	netif_tx_lock(ndev);
+	netif_device_detach(ndev);
+	netif_tx_unlock(ndev);
+
+	gfar_halt(priv);
+
+	if (wol & GFAR_WOL_MAGIC) {
+		/* Enable interrupt on Magic Packet */
+		gfar_write(&regs->imask, IMASK_MAG);
+
+		/* Enable Magic Packet mode */
+		tempval = gfar_read(&regs->maccfg2);
+		tempval |= MACCFG2_MPEN;
+		gfar_write(&regs->maccfg2, tempval);
+
+		/* re-enable the Rx block */
+		tempval = gfar_read(&regs->maccfg1);
+		tempval |= MACCFG1_RX_EN;
+		gfar_write(&regs->maccfg1, tempval);
+
+	} else if (wol & GFAR_WOL_FILER_UCAST) {
+		gfar_filer_config_wol(priv);
+		gfar_start_wol_filer(priv);
+
+	} else {
+		phy_stop(ndev->phydev);
+	}
+
+	return 0;
+}
+
+static int gfar_resume(struct device *dev)
+{
+	struct gfar_private *priv = dev_get_drvdata(dev);
+	struct net_device *ndev = priv->ndev;
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	u16 wol = priv->wol_opts;
+
+	if (!netif_running(ndev))
+		return 0;
+
+	if (wol & GFAR_WOL_MAGIC) {
+		/* Disable Magic Packet mode */
+		tempval = gfar_read(&regs->maccfg2);
+		tempval &= ~MACCFG2_MPEN;
+		gfar_write(&regs->maccfg2, tempval);
+
+	} else if (wol & GFAR_WOL_FILER_UCAST) {
+		/* need to stop rx only, tx is already down */
+		gfar_halt(priv);
+		gfar_filer_restore_table(priv);
+
+	} else {
+		phy_start(ndev->phydev);
+	}
+
+	gfar_start(priv);
+
+	netif_device_attach(ndev);
+	enable_napi(priv);
+
+	return 0;
+}
+
+static int gfar_restore(struct device *dev)
+{
+	struct gfar_private *priv = dev_get_drvdata(dev);
+	struct net_device *ndev = priv->ndev;
+
+	if (!netif_running(ndev)) {
+		netif_device_attach(ndev);
+
+		return 0;
+	}
+
+	gfar_init_bds(ndev);
+
+	gfar_mac_reset(priv);
+
+	gfar_init_tx_rx_base(priv);
+
+	gfar_start(priv);
+
+	priv->oldlink = 0;
+	priv->oldspeed = 0;
+	priv->oldduplex = -1;
+
+	if (ndev->phydev)
+		phy_start(ndev->phydev);
+
+	netif_device_attach(ndev);
+	enable_napi(priv);
+
+	return 0;
+}
+
+static const struct dev_pm_ops gfar_pm_ops = {
+	.suspend = gfar_suspend,
+	.resume = gfar_resume,
+	.freeze = gfar_suspend,
+	.thaw = gfar_resume,
+	.restore = gfar_restore,
+};
+
+#define GFAR_PM_OPS (&gfar_pm_ops)
+
+#else
+
+#define GFAR_PM_OPS NULL
+
+#endif
+
+static const struct of_device_id gfar_match[] =
+{
+	{
+		.type = "network",
+		.compatible = "gianfar",
+	},
+	{
+		.compatible = "fsl,etsec2",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, gfar_match);
+
+/* Structure for a device driver */
+static struct platform_driver gfar_driver = {
+	.driver = {
+		.name = "fsl-gianfar",
+		.pm = GFAR_PM_OPS,
+		.of_match_table = gfar_match,
+	},
+	.probe = gfar_probe,
+	.remove = gfar_remove,
+};
+
+module_platform_driver(gfar_driver);