Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3033 insertions, 0 deletions

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
new file mode 100644
index 00000000000..d6de213720f
--- /dev/null
+++ b/drivers/net/mv643xx_eth.c
@@ -0,0 +1,3033 @@
+/*
+ * drivers/net/mv643xx_eth.c - Driver for MV643XX ethernet ports
+ * Copyright (C) 2002 Matthew Dharm <mdharm@momenco.com>
+ *
+ * Based on the 64360 driver from:
+ * Copyright (C) 2002 rabeeh@galileo.co.il
+ *
+ * Copyright (C) 2003 PMC-Sierra, Inc.,
+ *	written by Manish Lachwani (lachwani@pmc-sierra.com)
+ *
+ * Copyright (C) 2003 Ralf Baechle <ralf@linux-mips.org>
+ *
+ * Copyright (C) 2004-2005 MontaVista Software, Inc.
+ *			   Dale Farnsworth <dale@farnsworth.org>
+ *
+ * Copyright (C) 2004 Steven J. Hill <sjhill1@rockwellcollins.com>
+ *				     <sjhill@realitydiluted.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/etherdevice.h>
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <asm/io.h>
+#include <asm/types.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/delay.h>
+#include "mv643xx_eth.h"
+
+/*
+ * The first part is the high level driver of the gigE ethernet ports.
+ */
+
+/* Constants */
+#define VLAN_HLEN		4
+#define FCS_LEN			4
+#define WRAP			NET_IP_ALIGN + ETH_HLEN + VLAN_HLEN + FCS_LEN
+#define RX_SKB_SIZE		((dev->mtu + WRAP + 7) & ~0x7)
+
+#define INT_CAUSE_UNMASK_ALL		0x0007ffff
+#define INT_CAUSE_UNMASK_ALL_EXT	0x0011ffff
+#ifdef MV643XX_RX_QUEUE_FILL_ON_TASK
+#define INT_CAUSE_MASK_ALL		0x00000000
+#define INT_CAUSE_CHECK_BITS		INT_CAUSE_UNMASK_ALL
+#define INT_CAUSE_CHECK_BITS_EXT	INT_CAUSE_UNMASK_ALL_EXT
+#endif
+
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+#define MAX_DESCS_PER_SKB	(MAX_SKB_FRAGS + 1)
+#else
+#define MAX_DESCS_PER_SKB	1
+#endif
+
+#define PHY_WAIT_ITERATIONS	1000	/* 1000 iterations * 10uS = 10mS max */
+#define PHY_WAIT_MICRO_SECONDS	10
+
+/* Static function declarations */
+static int eth_port_link_is_up(unsigned int eth_port_num);
+static void eth_port_uc_addr_get(struct net_device *dev,
+						unsigned char *MacAddr);
+static int mv643xx_eth_real_open(struct net_device *);
+static int mv643xx_eth_real_stop(struct net_device *);
+static int mv643xx_eth_change_mtu(struct net_device *, int);
+static struct net_device_stats *mv643xx_eth_get_stats(struct net_device *);
+static void eth_port_init_mac_tables(unsigned int eth_port_num);
+#ifdef MV643XX_NAPI
+static int mv643xx_poll(struct net_device *dev, int *budget);
+#endif
+static void ethernet_phy_set(unsigned int eth_port_num, int phy_addr);
+static int ethernet_phy_detect(unsigned int eth_port_num);
+static struct ethtool_ops mv643xx_ethtool_ops;
+
+static char mv643xx_driver_name[] = "mv643xx_eth";
+static char mv643xx_driver_version[] = "1.0";
+
+static void __iomem *mv643xx_eth_shared_base;
+
+/* used to protect MV643XX_ETH_SMI_REG, which is shared across ports */
+static spinlock_t mv643xx_eth_phy_lock = SPIN_LOCK_UNLOCKED;
+
+static inline u32 mv_read(int offset)
+{
+	void *__iomem reg_base;
+
+	reg_base = mv643xx_eth_shared_base - MV643XX_ETH_SHARED_REGS;
+
+	return readl(reg_base + offset);
+}
+
+static inline void mv_write(int offset, u32 data)
+{
+	void * __iomem reg_base;
+
+	reg_base = mv643xx_eth_shared_base - MV643XX_ETH_SHARED_REGS;
+	writel(data, reg_base + offset);
+}
+
+/*
+ * Changes MTU (maximum transfer unit) of the gigabit ethenret port
+ *
+ * Input :	pointer to ethernet interface network device structure
+ *		new mtu size
+ * Output :	0 upon success, -EINVAL upon failure
+ */
+static int mv643xx_eth_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mp->lock, flags);
+
+	if ((new_mtu > 9500) || (new_mtu < 64)) {
+		spin_unlock_irqrestore(&mp->lock, flags);
+		return -EINVAL;
+	}
+
+	dev->mtu = new_mtu;
+	/*
+	 * Stop then re-open the interface. This will allocate RX skb's with
+	 * the new MTU.
+	 * There is a possible danger that the open will not successed, due
+	 * to memory is full, which might fail the open function.
+	 */
+	if (netif_running(dev)) {
+		if (mv643xx_eth_real_stop(dev))
+			printk(KERN_ERR
+				"%s: Fatal error on stopping device\n",
+				dev->name);
+		if (mv643xx_eth_real_open(dev))
+			printk(KERN_ERR
+				"%s: Fatal error on opening device\n",
+				dev->name);
+	}
+
+	spin_unlock_irqrestore(&mp->lock, flags);
+	return 0;
+}
+
+/*
+ * mv643xx_eth_rx_task
+ *
+ * Fills / refills RX queue on a certain gigabit ethernet port
+ *
+ * Input :	pointer to ethernet interface network device structure
+ * Output :	N/A
+ */
+static void mv643xx_eth_rx_task(void *data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct mv643xx_private *mp = netdev_priv(dev);
+	struct pkt_info pkt_info;
+	struct sk_buff *skb;
+
+	if (test_and_set_bit(0, &mp->rx_task_busy))
+		panic("%s: Error in test_set_bit / clear_bit", dev->name);
+
+	while (mp->rx_ring_skbs < (mp->rx_ring_size - 5)) {
+		skb = dev_alloc_skb(RX_SKB_SIZE);
+		if (!skb)
+			break;
+		mp->rx_ring_skbs++;
+		pkt_info.cmd_sts = ETH_RX_ENABLE_INTERRUPT;
+		pkt_info.byte_cnt = RX_SKB_SIZE;
+		pkt_info.buf_ptr = dma_map_single(NULL, skb->data, RX_SKB_SIZE,
+							DMA_FROM_DEVICE);
+		pkt_info.return_info = skb;
+		if (eth_rx_return_buff(mp, &pkt_info) != ETH_OK) {
+			printk(KERN_ERR
+				"%s: Error allocating RX Ring\n", dev->name);
+			break;
+		}
+		skb_reserve(skb, 2);
+	}
+	clear_bit(0, &mp->rx_task_busy);
+	/*
+	 * If RX ring is empty of SKB, set a timer to try allocating
+	 * again in a later time .
+	 */
+	if ((mp->rx_ring_skbs == 0) && (mp->rx_timer_flag == 0)) {
+		printk(KERN_INFO "%s: Rx ring is empty\n", dev->name);
+		/* After 100mSec */
+		mp->timeout.expires = jiffies + (HZ / 10);
+		add_timer(&mp->timeout);
+		mp->rx_timer_flag = 1;
+	}
+#ifdef MV643XX_RX_QUEUE_FILL_ON_TASK
+	else {
+		/* Return interrupts */
+		mv_write(MV643XX_ETH_INTERRUPT_MASK_REG(mp->port_num),
+							INT_CAUSE_UNMASK_ALL);
+	}
+#endif
+}
+
+/*
+ * mv643xx_eth_rx_task_timer_wrapper
+ *
+ * Timer routine to wake up RX queue filling task. This function is
+ * used only in case the RX queue is empty, and all alloc_skb has
+ * failed (due to out of memory event).
+ *
+ * Input :	pointer to ethernet interface network device structure
+ * Output :	N/A
+ */
+static void mv643xx_eth_rx_task_timer_wrapper(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct mv643xx_private *mp = netdev_priv(dev);
+
+	mp->rx_timer_flag = 0;
+	mv643xx_eth_rx_task((void *)data);
+}
+
+/*
+ * mv643xx_eth_update_mac_address
+ *
+ * Update the MAC address of the port in the address table
+ *
+ * Input :	pointer to ethernet interface network device structure
+ * Output :	N/A
+ */
+static void mv643xx_eth_update_mac_address(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int port_num = mp->port_num;
+
+	eth_port_init_mac_tables(port_num);
+	memcpy(mp->port_mac_addr, dev->dev_addr, 6);
+	eth_port_uc_addr_set(port_num, mp->port_mac_addr);
+}
+
+/*
+ * mv643xx_eth_set_rx_mode
+ *
+ * Change from promiscuos to regular rx mode
+ *
+ * Input :	pointer to ethernet interface network device structure
+ * Output :	N/A
+ */
+static void mv643xx_eth_set_rx_mode(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	u32 config_reg;
+
+	config_reg = ethernet_get_config_reg(mp->port_num);
+	if (dev->flags & IFF_PROMISC)
+		config_reg |= (u32) MV643XX_ETH_UNICAST_PROMISCUOUS_MODE;
+	else
+		config_reg &= ~(u32) MV643XX_ETH_UNICAST_PROMISCUOUS_MODE;
+	ethernet_set_config_reg(mp->port_num, config_reg);
+}
+
+/*
+ * mv643xx_eth_set_mac_address
+ *
+ * Change the interface's mac address.
+ * No special hardware thing should be done because interface is always
+ * put in promiscuous mode.
+ *
+ * Input :	pointer to ethernet interface network device structure and
+ *		a pointer to the designated entry to be added to the cache.
+ * Output :	zero upon success, negative upon failure
+ */
+static int mv643xx_eth_set_mac_address(struct net_device *dev, void *addr)
+{
+	int i;
+
+	for (i = 0; i < 6; i++)
+		/* +2 is for the offset of the HW addr type */
+		dev->dev_addr[i] = ((unsigned char *)addr)[i + 2];
+	mv643xx_eth_update_mac_address(dev);
+	return 0;
+}
+
+/*
+ * mv643xx_eth_tx_timeout
+ *
+ * Called upon a timeout on transmitting a packet
+ *
+ * Input :	pointer to ethernet interface network device structure.
+ * Output :	N/A
+ */
+static void mv643xx_eth_tx_timeout(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+
+	printk(KERN_INFO "%s: TX timeout  ", dev->name);
+
+	/* Do the reset outside of interrupt context */
+	schedule_work(&mp->tx_timeout_task);
+}
+
+/*
+ * mv643xx_eth_tx_timeout_task
+ *
+ * Actual routine to reset the adapter when a timeout on Tx has occurred
+ */
+static void mv643xx_eth_tx_timeout_task(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+
+	netif_device_detach(dev);
+	eth_port_reset(mp->port_num);
+	eth_port_start(mp);
+	netif_device_attach(dev);
+}
+
+/*
+ * mv643xx_eth_free_tx_queue
+ *
+ * Input :	dev - a pointer to the required interface
+ *
+ * Output :	0 if was able to release skb , nonzero otherwise
+ */
+static int mv643xx_eth_free_tx_queue(struct net_device *dev,
+					unsigned int eth_int_cause_ext)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	struct net_device_stats *stats = &mp->stats;
+	struct pkt_info pkt_info;
+	int released = 1;
+
+	if (!(eth_int_cause_ext & (BIT0 | BIT8)))
+		return released;
+
+	spin_lock(&mp->lock);
+
+	/* Check only queue 0 */
+	while (eth_tx_return_desc(mp, &pkt_info) == ETH_OK) {
+		if (pkt_info.cmd_sts & BIT0) {
+			printk("%s: Error in TX\n", dev->name);
+			stats->tx_errors++;
+		}
+
+		/*
+		 * If return_info is different than 0, release the skb.
+		 * The case where return_info is not 0 is only in case
+		 * when transmitted a scatter/gather packet, where only
+		 * last skb releases the whole chain.
+		 */
+		if (pkt_info.return_info) {
+			if (skb_shinfo(pkt_info.return_info)->nr_frags)
+				dma_unmap_page(NULL, pkt_info.buf_ptr,
+						pkt_info.byte_cnt,
+						DMA_TO_DEVICE);
+			else
+				dma_unmap_single(NULL, pkt_info.buf_ptr,
+						pkt_info.byte_cnt,
+						DMA_TO_DEVICE);
+
+			dev_kfree_skb_irq(pkt_info.return_info);
+			released = 0;
+
+			/*
+			 * Decrement the number of outstanding skbs counter on
+			 * the TX queue.
+			 */
+			if (mp->tx_ring_skbs == 0)
+				panic("ERROR - TX outstanding SKBs"
+						" counter is corrupted");
+			mp->tx_ring_skbs--;
+		} else
+			dma_unmap_page(NULL, pkt_info.buf_ptr,
+					pkt_info.byte_cnt, DMA_TO_DEVICE);
+	}
+
+	spin_unlock(&mp->lock);
+
+	return released;
+}
+
+/*
+ * mv643xx_eth_receive
+ *
+ * This function is forward packets that are received from the port's
+ * queues toward kernel core or FastRoute them to another interface.
+ *
+ * Input :	dev - a pointer to the required interface
+ *		max - maximum number to receive (0 means unlimted)
+ *
+ * Output :	number of served packets
+ */
+#ifdef MV643XX_NAPI
+static int mv643xx_eth_receive_queue(struct net_device *dev, int budget)
+#else
+static int mv643xx_eth_receive_queue(struct net_device *dev)
+#endif
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	struct net_device_stats *stats = &mp->stats;
+	unsigned int received_packets = 0;
+	struct sk_buff *skb;
+	struct pkt_info pkt_info;
+
+#ifdef MV643XX_NAPI
+	while (eth_port_receive(mp, &pkt_info) == ETH_OK && budget > 0) {
+#else
+	while (eth_port_receive(mp, &pkt_info) == ETH_OK) {
+#endif
+		mp->rx_ring_skbs--;
+		received_packets++;
+#ifdef MV643XX_NAPI
+		budget--;
+#endif
+		/* Update statistics. Note byte count includes 4 byte CRC count */
+		stats->rx_packets++;
+		stats->rx_bytes += pkt_info.byte_cnt;
+		skb = pkt_info.return_info;
+		/*
+		 * In case received a packet without first / last bits on OR
+		 * the error summary bit is on, the packets needs to be dropeed.
+		 */
+		if (((pkt_info.cmd_sts
+				& (ETH_RX_FIRST_DESC | ETH_RX_LAST_DESC)) !=
+					(ETH_RX_FIRST_DESC | ETH_RX_LAST_DESC))
+				|| (pkt_info.cmd_sts & ETH_ERROR_SUMMARY)) {
+			stats->rx_dropped++;
+			if ((pkt_info.cmd_sts & (ETH_RX_FIRST_DESC |
+							ETH_RX_LAST_DESC)) !=
+				(ETH_RX_FIRST_DESC | ETH_RX_LAST_DESC)) {
+				if (net_ratelimit())
+					printk(KERN_ERR
+						"%s: Received packet spread "
+						"on multiple descriptors\n",
+						dev->name);
+			}
+			if (pkt_info.cmd_sts & ETH_ERROR_SUMMARY)
+				stats->rx_errors++;
+
+			dev_kfree_skb_irq(skb);
+		} else {
+			/*
+			 * The -4 is for the CRC in the trailer of the
+			 * received packet
+			 */
+			skb_put(skb, pkt_info.byte_cnt - 4);
+			skb->dev = dev;
+
+			if (pkt_info.cmd_sts & ETH_LAYER_4_CHECKSUM_OK) {
+				skb->ip_summed = CHECKSUM_UNNECESSARY;
+				skb->csum = htons(
+					(pkt_info.cmd_sts & 0x0007fff8) >> 3);
+			}
+			skb->protocol = eth_type_trans(skb, dev);
+#ifdef MV643XX_NAPI
+			netif_receive_skb(skb);
+#else
+			netif_rx(skb);
+#endif
+		}
+	}
+
+	return received_packets;
+}
+
+/*
+ * mv643xx_eth_int_handler
+ *
+ * Main interrupt handler for the gigbit ethernet ports
+ *
+ * Input :	irq	- irq number (not used)
+ *		dev_id	- a pointer to the required interface's data structure
+ *		regs	- not used
+ * Output :	N/A
+ */
+
+static irqreturn_t mv643xx_eth_int_handler(int irq, void *dev_id,
+							struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct mv643xx_private *mp = netdev_priv(dev);
+	u32 eth_int_cause, eth_int_cause_ext = 0;
+	unsigned int port_num = mp->port_num;
+
+	/* Read interrupt cause registers */
+	eth_int_cause = mv_read(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num)) &
+						INT_CAUSE_UNMASK_ALL;
+
+	if (eth_int_cause & BIT1)
+		eth_int_cause_ext = mv_read(
+			MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num)) &
+						INT_CAUSE_UNMASK_ALL_EXT;
+
+#ifdef MV643XX_NAPI
+	if (!(eth_int_cause & 0x0007fffd)) {
+		/* Dont ack the Rx interrupt */
+#endif
+		/*
+		 * Clear specific ethernet port intrerrupt registers by
+		 * acknowleding relevant bits.
+		 */
+		mv_write(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num),
+							~eth_int_cause);
+		if (eth_int_cause_ext != 0x0)
+			mv_write(MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG
+					(port_num), ~eth_int_cause_ext);
+
+		/* UDP change : We may need this */
+		if ((eth_int_cause_ext & 0x0000ffff) &&
+		    (mv643xx_eth_free_tx_queue(dev, eth_int_cause_ext) == 0) &&
+		    (mp->tx_ring_size > mp->tx_ring_skbs + MAX_DESCS_PER_SKB))
+			netif_wake_queue(dev);
+#ifdef MV643XX_NAPI
+	} else {
+		if (netif_rx_schedule_prep(dev)) {
+			/* Mask all the interrupts */
+			mv_write(MV643XX_ETH_INTERRUPT_MASK_REG(port_num), 0);
+			mv_write(MV643XX_ETH_INTERRUPT_EXTEND_MASK_REG
+								(port_num), 0);
+			__netif_rx_schedule(dev);
+		}
+#else
+		if (eth_int_cause & (BIT2 | BIT11))
+			mv643xx_eth_receive_queue(dev, 0);
+
+		/*
+		 * After forwarded received packets to upper layer, add a task
+		 * in an interrupts enabled context that refills the RX ring
+		 * with skb's.
+		 */
+#ifdef MV643XX_RX_QUEUE_FILL_ON_TASK
+		/* Unmask all interrupts on ethernet port */
+		mv_write(MV643XX_ETH_INTERRUPT_MASK_REG(port_num),
+							INT_CAUSE_MASK_ALL);
+		queue_task(&mp->rx_task, &tq_immediate);
+		mark_bh(IMMEDIATE_BH);
+#else
+		mp->rx_task.func(dev);
+#endif
+#endif
+	}
+	/* PHY status changed */
+	if (eth_int_cause_ext & (BIT16 | BIT20)) {
+		if (eth_port_link_is_up(port_num)) {
+			netif_carrier_on(dev);
+			netif_wake_queue(dev);
+			/* Start TX queue */
+			mv_write(MV643XX_ETH_TRANSMIT_QUEUE_COMMAND_REG
+								(port_num), 1);
+		} else {
+			netif_carrier_off(dev);
+			netif_stop_queue(dev);
+		}
+	}
+
+	/*
+	 * If no real interrupt occured, exit.
+	 * This can happen when using gigE interrupt coalescing mechanism.
+	 */
+	if ((eth_int_cause == 0x0) && (eth_int_cause_ext == 0x0))
+		return IRQ_NONE;
+
+	return IRQ_HANDLED;
+}
+
+#ifdef MV643XX_COAL
+
+/*
+ * eth_port_set_rx_coal - Sets coalescing interrupt mechanism on RX path
+ *
+ * DESCRIPTION:
+ *	This routine sets the RX coalescing interrupt mechanism parameter.
+ *	This parameter is a timeout counter, that counts in 64 t_clk
+ *	chunks ; that when timeout event occurs a maskable interrupt
+ *	occurs.
+ *	The parameter is calculated using the tClk of the MV-643xx chip
+ *	, and the required delay of the interrupt in usec.
+ *
+ * INPUT:
+ *	unsigned int eth_port_num	Ethernet port number
+ *	unsigned int t_clk		t_clk of the MV-643xx chip in HZ units
+ *	unsigned int delay		Delay in usec
+ *
+ * OUTPUT:
+ *	Interrupt coalescing mechanism value is set in MV-643xx chip.
+ *
+ * RETURN:
+ *	The interrupt coalescing value set in the gigE port.
+ *
+ */
+static unsigned int eth_port_set_rx_coal(unsigned int eth_port_num,
+					unsigned int t_clk, unsigned int delay)
+{
+	unsigned int coal = ((t_clk / 1000000) * delay) / 64;
+
+	/* Set RX Coalescing mechanism */
+	mv_write(MV643XX_ETH_SDMA_CONFIG_REG(eth_port_num),
+		((coal & 0x3fff) << 8) |
+		(mv_read(MV643XX_ETH_SDMA_CONFIG_REG(eth_port_num))
+			& 0xffc000ff));
+
+	return coal;
+}
+#endif
+
+/*
+ * eth_port_set_tx_coal - Sets coalescing interrupt mechanism on TX path
+ *
+ * DESCRIPTION:
+ *	This routine sets the TX coalescing interrupt mechanism parameter.
+ *	This parameter is a timeout counter, that counts in 64 t_clk
+ *	chunks ; that when timeout event occurs a maskable interrupt
+ *	occurs.
+ *	The parameter is calculated using the t_cLK frequency of the
+ *	MV-643xx chip and the required delay in the interrupt in uSec
+ *
+ * INPUT:
+ *	unsigned int eth_port_num	Ethernet port number
+ *	unsigned int t_clk		t_clk of the MV-643xx chip in HZ units
+ *	unsigned int delay		Delay in uSeconds
+ *
+ * OUTPUT:
+ *	Interrupt coalescing mechanism value is set in MV-643xx chip.
+ *
+ * RETURN:
+ *	The interrupt coalescing value set in the gigE port.
+ *
+ */
+static unsigned int eth_port_set_tx_coal(unsigned int eth_port_num,
+					unsigned int t_clk, unsigned int delay)
+{
+	unsigned int coal;
+	coal = ((t_clk / 1000000) * delay) / 64;
+	/* Set TX Coalescing mechanism */
+	mv_write(MV643XX_ETH_TX_FIFO_URGENT_THRESHOLD_REG(eth_port_num),
+								coal << 4);
+	return coal;
+}
+
+/*
+ * mv643xx_eth_open
+ *
+ * This function is called when openning the network device. The function
+ * should initialize all the hardware, initialize cyclic Rx/Tx
+ * descriptors chain and buffers and allocate an IRQ to the network
+ * device.
+ *
+ * Input :	a pointer to the network device structure
+ *
+ * Output :	zero of success , nonzero if fails.
+ */
+
+static int mv643xx_eth_open(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int port_num = mp->port_num;
+	int err;
+
+	spin_lock_irq(&mp->lock);
+
+	err = request_irq(dev->irq, mv643xx_eth_int_handler,
+			SA_INTERRUPT | SA_SAMPLE_RANDOM, dev->name, dev);
+
+	if (err) {
+		printk(KERN_ERR "Can not assign IRQ number to MV643XX_eth%d\n",
+								port_num);
+		err = -EAGAIN;
+		goto out;
+	}
+
+	if (mv643xx_eth_real_open(dev)) {
+		printk("%s: Error opening interface\n", dev->name);
+		err = -EBUSY;
+		goto out_free;
+	}
+
+	spin_unlock_irq(&mp->lock);
+
+	return 0;
+
+out_free:
+	free_irq(dev->irq, dev);
+
+out:
+	spin_unlock_irq(&mp->lock);
+
+	return err;
+}
+
+/*
+ * ether_init_rx_desc_ring - Curve a Rx chain desc list and buffer in memory.
+ *
+ * DESCRIPTION:
+ *	This function prepares a Rx chained list of descriptors and packet
+ *	buffers in a form of a ring. The routine must be called after port
+ *	initialization routine and before port start routine.
+ *	The Ethernet SDMA engine uses CPU bus addresses to access the various
+ *	devices in the system (i.e. DRAM). This function uses the ethernet
+ *	struct 'virtual to physical' routine (set by the user) to set the ring
+ *	with physical addresses.
+ *
+ * INPUT:
+ *	struct mv643xx_private *mp	Ethernet Port Control srtuct.
+ *
+ * OUTPUT:
+ *	The routine updates the Ethernet port control struct with information
+ *	regarding the Rx descriptors and buffers.
+ *
+ * RETURN:
+ *	None.
+ */
+static void ether_init_rx_desc_ring(struct mv643xx_private *mp)
+{
+	volatile struct eth_rx_desc *p_rx_desc;
+	int rx_desc_num = mp->rx_ring_size;
+	int i;
+
+	/* initialize the next_desc_ptr links in the Rx descriptors ring */
+	p_rx_desc = (struct eth_rx_desc *)mp->p_rx_desc_area;
+	for (i = 0; i < rx_desc_num; i++) {
+		p_rx_desc[i].next_desc_ptr = mp->rx_desc_dma +
+			((i + 1) % rx_desc_num) * sizeof(struct eth_rx_desc);
+	}
+
+	/* Save Rx desc pointer to driver struct. */
+	mp->rx_curr_desc_q = 0;
+	mp->rx_used_desc_q = 0;
+
+	mp->rx_desc_area_size = rx_desc_num * sizeof(struct eth_rx_desc);
+
+	/* Add the queue to the list of RX queues of this port */
+	mp->port_rx_queue_command |= 1;
+}
+
+/*
+ * ether_init_tx_desc_ring - Curve a Tx chain desc list and buffer in memory.
+ *
+ * DESCRIPTION:
+ *	This function prepares a Tx chained list of descriptors and packet
+ *	buffers in a form of a ring. The routine must be called after port
+ *	initialization routine and before port start routine.
+ *	The Ethernet SDMA engine uses CPU bus addresses to access the various
+ *	devices in the system (i.e. DRAM). This function uses the ethernet
+ *	struct 'virtual to physical' routine (set by the user) to set the ring
+ *	with physical addresses.
+ *
+ * INPUT:
+ *	struct mv643xx_private *mp	Ethernet Port Control srtuct.
+ *
+ * OUTPUT:
+ *	The routine updates the Ethernet port control struct with information
+ *	regarding the Tx descriptors and buffers.
+ *
+ * RETURN:
+ *	None.
+ */
+static void ether_init_tx_desc_ring(struct mv643xx_private *mp)
+{
+	int tx_desc_num = mp->tx_ring_size;
+	struct eth_tx_desc *p_tx_desc;
+	int i;
+
+	/* Initialize the next_desc_ptr links in the Tx descriptors ring */
+	p_tx_desc = (struct eth_tx_desc *)mp->p_tx_desc_area;
+	for (i = 0; i < tx_desc_num; i++) {
+		p_tx_desc[i].next_desc_ptr = mp->tx_desc_dma +
+			((i + 1) % tx_desc_num) * sizeof(struct eth_tx_desc);
+	}
+
+	mp->tx_curr_desc_q = 0;
+	mp->tx_used_desc_q = 0;
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+	mp->tx_first_desc_q = 0;
+#endif
+
+	mp->tx_desc_area_size = tx_desc_num * sizeof(struct eth_tx_desc);
+
+	/* Add the queue to the list of Tx queues of this port */
+	mp->port_tx_queue_command |= 1;
+}
+
+/* Helper function for mv643xx_eth_open */
+static int mv643xx_eth_real_open(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int port_num = mp->port_num;
+	unsigned int size;
+
+	/* Stop RX Queues */
+	mv_write(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num), 0x0000ff00);
+
+	/* Clear the ethernet port interrupts */
+	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
+	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
+
+	/* Unmask RX buffer and TX end interrupt */
+	mv_write(MV643XX_ETH_INTERRUPT_MASK_REG(port_num),
+						INT_CAUSE_UNMASK_ALL);
+
+	/* Unmask phy and link status changes interrupts */
+	mv_write(MV643XX_ETH_INTERRUPT_EXTEND_MASK_REG(port_num),
+						INT_CAUSE_UNMASK_ALL_EXT);
+
+	/* Set the MAC Address */
+	memcpy(mp->port_mac_addr, dev->dev_addr, 6);
+
+	eth_port_init(mp);
+
+	INIT_WORK(&mp->rx_task, (void (*)(void *))mv643xx_eth_rx_task, dev);
+
+	memset(&mp->timeout, 0, sizeof(struct timer_list));
+	mp->timeout.function = mv643xx_eth_rx_task_timer_wrapper;
+	mp->timeout.data = (unsigned long)dev;
+
+	mp->rx_task_busy = 0;
+	mp->rx_timer_flag = 0;
+
+	/* Allocate RX and TX skb rings */
+	mp->rx_skb = kmalloc(sizeof(*mp->rx_skb) * mp->rx_ring_size,
+								GFP_KERNEL);
+	if (!mp->rx_skb) {
+		printk(KERN_ERR "%s: Cannot allocate Rx skb ring\n", dev->name);
+		return -ENOMEM;
+	}
+	mp->tx_skb = kmalloc(sizeof(*mp->tx_skb) * mp->tx_ring_size,
+								GFP_KERNEL);
+	if (!mp->tx_skb) {
+		printk(KERN_ERR "%s: Cannot allocate Tx skb ring\n", dev->name);
+		kfree(mp->rx_skb);
+		return -ENOMEM;
+	}
+
+	/* Allocate TX ring */
+	mp->tx_ring_skbs = 0;
+	size = mp->tx_ring_size * sizeof(struct eth_tx_desc);
+	mp->tx_desc_area_size = size;
+
+	if (mp->tx_sram_size) {
+		mp->p_tx_desc_area = ioremap(mp->tx_sram_addr,
+							mp->tx_sram_size);
+		mp->tx_desc_dma = mp->tx_sram_addr;
+	} else
+		mp->p_tx_desc_area = dma_alloc_coherent(NULL, size,
+							&mp->tx_desc_dma,
+							GFP_KERNEL);
+
+	if (!mp->p_tx_desc_area) {
+		printk(KERN_ERR "%s: Cannot allocate Tx Ring (size %d bytes)\n",
+							dev->name, size);
+		kfree(mp->rx_skb);
+		kfree(mp->tx_skb);
+		return -ENOMEM;
+	}
+	BUG_ON((u32) mp->p_tx_desc_area & 0xf);	/* check 16-byte alignment */
+	memset((void *)mp->p_tx_desc_area, 0, mp->tx_desc_area_size);
+
+	ether_init_tx_desc_ring(mp);
+
+	/* Allocate RX ring */
+	mp->rx_ring_skbs = 0;
+	size = mp->rx_ring_size * sizeof(struct eth_rx_desc);
+	mp->rx_desc_area_size = size;
+
+	if (mp->rx_sram_size) {
+		mp->p_rx_desc_area = ioremap(mp->rx_sram_addr,
+							mp->rx_sram_size);
+		mp->rx_desc_dma = mp->rx_sram_addr;
+	} else
+		mp->p_rx_desc_area = dma_alloc_coherent(NULL, size,
+							&mp->rx_desc_dma,
+							GFP_KERNEL);
+
+	if (!mp->p_rx_desc_area) {
+		printk(KERN_ERR "%s: Cannot allocate Rx ring (size %d bytes)\n",
+							dev->name, size);
+		printk(KERN_ERR "%s: Freeing previously allocated TX queues...",
+							dev->name);
+		if (mp->rx_sram_size)
+			iounmap(mp->p_rx_desc_area);
+		else
+			dma_free_coherent(NULL, mp->tx_desc_area_size,
+					mp->p_tx_desc_area, mp->tx_desc_dma);
+		kfree(mp->rx_skb);
+		kfree(mp->tx_skb);
+		return -ENOMEM;
+	}
+	memset((void *)mp->p_rx_desc_area, 0, size);
+
+	ether_init_rx_desc_ring(mp);
+
+	mv643xx_eth_rx_task(dev);	/* Fill RX ring with skb's */
+
+	eth_port_start(mp);
+
+	/* Interrupt Coalescing */
+
+#ifdef MV643XX_COAL
+	mp->rx_int_coal =
+		eth_port_set_rx_coal(port_num, 133000000, MV643XX_RX_COAL);
+#endif
+
+	mp->tx_int_coal =
+		eth_port_set_tx_coal(port_num, 133000000, MV643XX_TX_COAL);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+static void mv643xx_eth_free_tx_rings(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int port_num = mp->port_num;
+	unsigned int curr;
+
+	/* Stop Tx Queues */
+	mv_write(MV643XX_ETH_TRANSMIT_QUEUE_COMMAND_REG(port_num), 0x0000ff00);
+
+	/* Free outstanding skb's on TX rings */
+	for (curr = 0; mp->tx_ring_skbs && curr < mp->tx_ring_size; curr++) {
+		if (mp->tx_skb[curr]) {
+			dev_kfree_skb(mp->tx_skb[curr]);
+			mp->tx_ring_skbs--;
+		}
+	}
+	if (mp->tx_ring_skbs)
+		printk("%s: Error on Tx descriptor free - could not free %d"
+				" descriptors\n", dev->name, mp->tx_ring_skbs);
+
+	/* Free TX ring */
+	if (mp->tx_sram_size)
+		iounmap(mp->p_tx_desc_area);
+	else
+		dma_free_coherent(NULL, mp->tx_desc_area_size,
+				mp->p_tx_desc_area, mp->tx_desc_dma);
+}
+
+static void mv643xx_eth_free_rx_rings(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int port_num = mp->port_num;
+	int curr;
+
+	/* Stop RX Queues */
+	mv_write(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num), 0x0000ff00);
+
+	/* Free preallocated skb's on RX rings */
+	for (curr = 0; mp->rx_ring_skbs && curr < mp->rx_ring_size; curr++) {
+		if (mp->rx_skb[curr]) {
+			dev_kfree_skb(mp->rx_skb[curr]);
+			mp->rx_ring_skbs--;
+		}
+	}
+
+	if (mp->rx_ring_skbs)
+		printk(KERN_ERR
+			"%s: Error in freeing Rx Ring. %d skb's still"
+			" stuck in RX Ring - ignoring them\n", dev->name,
+			mp->rx_ring_skbs);
+	/* Free RX ring */
+	if (mp->rx_sram_size)
+		iounmap(mp->p_rx_desc_area);
+	else
+		dma_free_coherent(NULL, mp->rx_desc_area_size,
+				mp->p_rx_desc_area, mp->rx_desc_dma);
+}
+
+/*
+ * mv643xx_eth_stop
+ *
+ * This function is used when closing the network device.
+ * It updates the hardware,
+ * release all memory that holds buffers and descriptors and release the IRQ.
+ * Input :	a pointer to the device structure
+ * Output :	zero if success , nonzero if fails
+ */
+
+/* Helper function for mv643xx_eth_stop */
+
+static int mv643xx_eth_real_stop(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int port_num = mp->port_num;
+
+	netif_carrier_off(dev);
+	netif_stop_queue(dev);
+
+	mv643xx_eth_free_tx_rings(dev);
+	mv643xx_eth_free_rx_rings(dev);
+
+	eth_port_reset(mp->port_num);
+
+	/* Disable ethernet port interrupts */
+	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
+	mv_write(MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
+
+	/* Mask RX buffer and TX end interrupt */
+	mv_write(MV643XX_ETH_INTERRUPT_MASK_REG(port_num), 0);
+
+	/* Mask phy and link status changes interrupts */
+	mv_write(MV643XX_ETH_INTERRUPT_EXTEND_MASK_REG(port_num), 0);
+
+	return 0;
+}
+
+static int mv643xx_eth_stop(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+
+	spin_lock_irq(&mp->lock);
+
+	mv643xx_eth_real_stop(dev);
+
+	free_irq(dev->irq, dev);
+	spin_unlock_irq(&mp->lock);
+
+	return 0;
+}
+
+#ifdef MV643XX_NAPI
+static void mv643xx_tx(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	struct pkt_info pkt_info;
+
+	while (eth_tx_return_desc(mp, &pkt_info) == ETH_OK) {
+		if (pkt_info.return_info) {
+			if (skb_shinfo(pkt_info.return_info)->nr_frags)
+				dma_unmap_page(NULL, pkt_info.buf_ptr,
+						pkt_info.byte_cnt,
+						DMA_TO_DEVICE);
+			else
+				dma_unmap_single(NULL, pkt_info.buf_ptr,
+						pkt_info.byte_cnt,
+						DMA_TO_DEVICE);
+
+			dev_kfree_skb_irq(pkt_info.return_info);
+
+			if (mp->tx_ring_skbs)
+				mp->tx_ring_skbs--;
+		} else
+			dma_unmap_page(NULL, pkt_info.buf_ptr,
+					pkt_info.byte_cnt, DMA_TO_DEVICE);
+	}
+
+	if (netif_queue_stopped(dev) &&
+			mp->tx_ring_size > mp->tx_ring_skbs + MAX_DESCS_PER_SKB)
+		netif_wake_queue(dev);
+}
+
+/*
+ * mv643xx_poll
+ *
+ * This function is used in case of NAPI
+ */
+static int mv643xx_poll(struct net_device *dev, int *budget)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	int done = 1, orig_budget, work_done;
+	unsigned int port_num = mp->port_num;
+	unsigned long flags;
+
+#ifdef MV643XX_TX_FAST_REFILL
+	if (++mp->tx_clean_threshold > 5) {
+		spin_lock_irqsave(&mp->lock, flags);
+		mv643xx_tx(dev);
+		mp->tx_clean_threshold = 0;
+		spin_unlock_irqrestore(&mp->lock, flags);
+	}
+#endif
+
+	if ((mv_read(MV643XX_ETH_RX_CURRENT_QUEUE_DESC_PTR_0(port_num)))
+						!= (u32) mp->rx_used_desc_q) {
+		orig_budget = *budget;
+		if (orig_budget > dev->quota)
+			orig_budget = dev->quota;
+		work_done = mv643xx_eth_receive_queue(dev, orig_budget);
+		mp->rx_task.func(dev);
+		*budget -= work_done;
+		dev->quota -= work_done;
+		if (work_done >= orig_budget)
+			done = 0;
+	}
+
+	if (done) {
+		spin_lock_irqsave(&mp->lock, flags);
+		__netif_rx_complete(dev);
+		mv_write(MV643XX_ETH_INTERRUPT_CAUSE_REG(port_num), 0);
+		mv_write(MV643XX_ETH_INTERRUPT_CAUSE_EXTEND_REG(port_num), 0);
+		mv_write(MV643XX_ETH_INTERRUPT_MASK_REG(port_num),
+						INT_CAUSE_UNMASK_ALL);
+		mv_write(MV643XX_ETH_INTERRUPT_EXTEND_MASK_REG(port_num),
+						INT_CAUSE_UNMASK_ALL_EXT);
+		spin_unlock_irqrestore(&mp->lock, flags);
+	}
+
+	return done ? 0 : 1;
+}
+#endif
+
+/*
+ * mv643xx_eth_start_xmit
+ *
+ * This function is queues a packet in the Tx descriptor for
+ * required port.
+ *
+ * Input :	skb - a pointer to socket buffer
+ *		dev - a pointer to the required port
+ *
+ * Output :	zero upon success
+ */
+static int mv643xx_eth_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	struct net_device_stats *stats = &mp->stats;
+	ETH_FUNC_RET_STATUS status;
+	unsigned long flags;
+	struct pkt_info pkt_info;
+
+	if (netif_queue_stopped(dev)) {
+		printk(KERN_ERR
+			"%s: Tried sending packet when interface is stopped\n",
+			dev->name);
+		return 1;
+	}
+
+	/* This is a hard error, log it. */
+	if ((mp->tx_ring_size - mp->tx_ring_skbs) <=
+					(skb_shinfo(skb)->nr_frags + 1)) {
+		netif_stop_queue(dev);
+		printk(KERN_ERR
+			"%s: Bug in mv643xx_eth - Trying to transmit when"
+			" queue full !\n", dev->name);
+		return 1;
+	}
+
+	/* Paranoid check - this shouldn't happen */
+	if (skb == NULL) {
+		stats->tx_dropped++;
+		printk(KERN_ERR "mv64320_eth paranoid check failed\n");
+		return 1;
+	}
+
+	spin_lock_irqsave(&mp->lock, flags);
+
+	/* Update packet info data structure -- DMA owned, first last */
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+	if (!skb_shinfo(skb)->nr_frags) {
+linear:
+		if (skb->ip_summed != CHECKSUM_HW) {
+			pkt_info.cmd_sts = ETH_TX_ENABLE_INTERRUPT |
+					ETH_TX_FIRST_DESC | ETH_TX_LAST_DESC;
+			pkt_info.l4i_chk = 0;
+		} else {
+			u32 ipheader = skb->nh.iph->ihl << 11;
+
+			pkt_info.cmd_sts = ETH_TX_ENABLE_INTERRUPT |
+					ETH_TX_FIRST_DESC | ETH_TX_LAST_DESC |
+					ETH_GEN_TCP_UDP_CHECKSUM |
+					ETH_GEN_IP_V_4_CHECKSUM | ipheader;
+			/* CPU already calculated pseudo header checksum. */
+			if (skb->nh.iph->protocol == IPPROTO_UDP) {
+				pkt_info.cmd_sts |= ETH_UDP_FRAME;
+				pkt_info.l4i_chk = skb->h.uh->check;
+			} else if (skb->nh.iph->protocol == IPPROTO_TCP)
+				pkt_info.l4i_chk = skb->h.th->check;
+			else {
+				printk(KERN_ERR
+					"%s: chksum proto != TCP or UDP\n",
+					dev->name);
+				spin_unlock_irqrestore(&mp->lock, flags);
+				return 1;
+			}
+		}
+		pkt_info.byte_cnt = skb->len;
+		pkt_info.buf_ptr = dma_map_single(NULL, skb->data, skb->len,
+							DMA_TO_DEVICE);
+		pkt_info.return_info = skb;
+		mp->tx_ring_skbs++;
+		status = eth_port_send(mp, &pkt_info);
+		if ((status == ETH_ERROR) || (status == ETH_QUEUE_FULL))
+			printk(KERN_ERR "%s: Error on transmitting packet\n",
+								dev->name);
+		stats->tx_bytes += pkt_info.byte_cnt;
+	} else {
+		unsigned int frag;
+		u32 ipheader;
+
+		/* Since hardware can't handle unaligned fragments smaller
+		 * than 9 bytes, if we find any, we linearize the skb
+		 * and start again.  When I've seen it, it's always been
+		 * the first frag (probably near the end of the page),
+		 * but we check all frags to be safe.
+		 */
+		for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
+			skb_frag_t *fragp;
+
+			fragp = &skb_shinfo(skb)->frags[frag];
+			if (fragp->size <= 8 && fragp->page_offset & 0x7) {
+				skb_linearize(skb, GFP_ATOMIC);
+				printk(KERN_DEBUG "%s: unaligned tiny fragment"
+						"%d of %d, fixed\n",
+						dev->name, frag,
+						skb_shinfo(skb)->nr_frags);
+				goto linear;
+			}
+		}
+
+		/* first frag which is skb header */
+		pkt_info.byte_cnt = skb_headlen(skb);
+		pkt_info.buf_ptr = dma_map_single(NULL, skb->data,
+							skb_headlen(skb),
+							DMA_TO_DEVICE);
+		pkt_info.l4i_chk = 0;
+		pkt_info.return_info = 0;
+		pkt_info.cmd_sts = ETH_TX_FIRST_DESC;
+
+		if (skb->ip_summed == CHECKSUM_HW) {
+			ipheader = skb->nh.iph->ihl << 11;
+			pkt_info.cmd_sts |= ETH_GEN_TCP_UDP_CHECKSUM |
+					ETH_GEN_IP_V_4_CHECKSUM | ipheader;
+			/* CPU already calculated pseudo header checksum. */
+			if (skb->nh.iph->protocol == IPPROTO_UDP) {
+				pkt_info.cmd_sts |= ETH_UDP_FRAME;
+				pkt_info.l4i_chk = skb->h.uh->check;
+			} else if (skb->nh.iph->protocol == IPPROTO_TCP)
+				pkt_info.l4i_chk = skb->h.th->check;
+			else {
+				printk(KERN_ERR
+					"%s: chksum proto != TCP or UDP\n",
+					dev->name);
+				spin_unlock_irqrestore(&mp->lock, flags);
+				return 1;
+			}
+		}
+
+		status = eth_port_send(mp, &pkt_info);
+		if (status != ETH_OK) {
+			if ((status == ETH_ERROR))
+				printk(KERN_ERR
+					"%s: Error on transmitting packet\n",
+					dev->name);
+			if (status == ETH_QUEUE_FULL)
+				printk("Error on Queue Full \n");
+			if (status == ETH_QUEUE_LAST_RESOURCE)
+				printk("Tx resource error \n");
+		}
+		stats->tx_bytes += pkt_info.byte_cnt;
+
+		/* Check for the remaining frags */
+		for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
+			skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
+			pkt_info.l4i_chk = 0x0000;
+			pkt_info.cmd_sts = 0x00000000;
+
+			/* Last Frag enables interrupt and frees the skb */
+			if (frag == (skb_shinfo(skb)->nr_frags - 1)) {
+				pkt_info.cmd_sts |= ETH_TX_ENABLE_INTERRUPT |
+							ETH_TX_LAST_DESC;
+				pkt_info.return_info = skb;
+				mp->tx_ring_skbs++;
+			} else {
+				pkt_info.return_info = 0;
+			}
+			pkt_info.l4i_chk = 0;
+			pkt_info.byte_cnt = this_frag->size;
+
+			pkt_info.buf_ptr = dma_map_page(NULL, this_frag->page,
+							this_frag->page_offset,
+							this_frag->size,
+							DMA_TO_DEVICE);
+
+			status = eth_port_send(mp, &pkt_info);
+
+			if (status != ETH_OK) {
+				if ((status == ETH_ERROR))
+					printk(KERN_ERR "%s: Error on "
+							"transmitting packet\n",
+							dev->name);
+
+				if (status == ETH_QUEUE_LAST_RESOURCE)
+					printk("Tx resource error \n");
+
+				if (status == ETH_QUEUE_FULL)
+					printk("Queue is full \n");
+			}
+			stats->tx_bytes += pkt_info.byte_cnt;
+		}
+	}
+#else
+	pkt_info.cmd_sts = ETH_TX_ENABLE_INTERRUPT | ETH_TX_FIRST_DESC |
+							ETH_TX_LAST_DESC;
+	pkt_info.l4i_chk = 0;
+	pkt_info.byte_cnt = skb->len;
+	pkt_info.buf_ptr = dma_map_single(NULL, skb->data, skb->len,
+								DMA_TO_DEVICE);
+	pkt_info.return_info = skb;
+	mp->tx_ring_skbs++;
+	status = eth_port_send(mp, &pkt_info);
+	if ((status == ETH_ERROR) || (status == ETH_QUEUE_FULL))
+		printk(KERN_ERR "%s: Error on transmitting packet\n",
+								dev->name);
+	stats->tx_bytes += pkt_info.byte_cnt;
+#endif
+
+	/* Check if TX queue can handle another skb. If not, then
+	 * signal higher layers to stop requesting TX
+	 */
+	if (mp->tx_ring_size <= (mp->tx_ring_skbs + MAX_DESCS_PER_SKB))
+		/*
+		 * Stop getting skb's from upper layers.
+		 * Getting skb's from upper layers will be enabled again after
+		 * packets are released.
+		 */
+		netif_stop_queue(dev);
+
+	/* Update statistics and start of transmittion time */
+	stats->tx_packets++;
+	dev->trans_start = jiffies;
+
+	spin_unlock_irqrestore(&mp->lock, flags);
+
+	return 0;		/* success */
+}
+
+/*
+ * mv643xx_eth_get_stats
+ *
+ * Returns a pointer to the interface statistics.
+ *
+ * Input :	dev - a pointer to the required interface
+ *
+ * Output :	a pointer to the interface's statistics
+ */
+
+static struct net_device_stats *mv643xx_eth_get_stats(struct net_device *dev)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+
+	return &mp->stats;
+}
+
+/*/
+ * mv643xx_eth_probe
+ *
+ * First function called after registering the network device.
+ * It's purpose is to initialize the device as an ethernet device,
+ * fill the ethernet device structure with pointers * to functions,
+ * and set the MAC address of the interface
+ *
+ * Input :	struct device *
+ * Output :	-ENOMEM if failed , 0 if success
+ */
+static int mv643xx_eth_probe(struct device *ddev)
+{
+	struct platform_device *pdev = to_platform_device(ddev);
+	struct mv643xx_eth_platform_data *pd;
+	int port_num = pdev->id;
+	struct mv643xx_private *mp;
+	struct net_device *dev;
+	u8 *p;
+	struct resource *res;
+	int err;
+
+	dev = alloc_etherdev(sizeof(struct mv643xx_private));
+	if (!dev)
+		return -ENOMEM;
+
+	dev_set_drvdata(ddev, dev);
+
+	mp = netdev_priv(dev);
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	BUG_ON(!res);
+	dev->irq = res->start;
+
+	mp->port_num = port_num;
+
+	dev->open = mv643xx_eth_open;
+	dev->stop = mv643xx_eth_stop;
+	dev->hard_start_xmit = mv643xx_eth_start_xmit;
+	dev->get_stats = mv643xx_eth_get_stats;
+	dev->set_mac_address = mv643xx_eth_set_mac_address;
+	dev->set_multicast_list = mv643xx_eth_set_rx_mode;
+
+	/* No need to Tx Timeout */
+	dev->tx_timeout = mv643xx_eth_tx_timeout;
+#ifdef MV643XX_NAPI
+	dev->poll = mv643xx_poll;
+	dev->weight = 64;
+#endif
+
+	dev->watchdog_timeo = 2 * HZ;
+	dev->tx_queue_len = mp->tx_ring_size;
+	dev->base_addr = 0;
+	dev->change_mtu = mv643xx_eth_change_mtu;
+	SET_ETHTOOL_OPS(dev, &mv643xx_ethtool_ops);
+
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+#ifdef MAX_SKB_FRAGS
+	/*
+	 * Zero copy can only work if we use Discovery II memory. Else, we will
+	 * have to map the buffers to ISA memory which is only 16 MB
+	 */
+	dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HW_CSUM;
+#endif
+#endif
+
+	/* Configure the timeout task */
+	INIT_WORK(&mp->tx_timeout_task,
+			(void (*)(void *))mv643xx_eth_tx_timeout_task, dev);
+
+	spin_lock_init(&mp->lock);
+
+	/* set default config values */
+	eth_port_uc_addr_get(dev, dev->dev_addr);
+	mp->port_config = MV643XX_ETH_PORT_CONFIG_DEFAULT_VALUE;
+	mp->port_config_extend = MV643XX_ETH_PORT_CONFIG_EXTEND_DEFAULT_VALUE;
+	mp->port_sdma_config = MV643XX_ETH_PORT_SDMA_CONFIG_DEFAULT_VALUE;
+	mp->port_serial_control = MV643XX_ETH_PORT_SERIAL_CONTROL_DEFAULT_VALUE;
+	mp->rx_ring_size = MV643XX_ETH_PORT_DEFAULT_RECEIVE_QUEUE_SIZE;
+	mp->tx_ring_size = MV643XX_ETH_PORT_DEFAULT_TRANSMIT_QUEUE_SIZE;
+
+	pd = pdev->dev.platform_data;
+	if (pd) {
+		if (pd->mac_addr != NULL)
+			memcpy(dev->dev_addr, pd->mac_addr, 6);
+
+		if (pd->phy_addr || pd->force_phy_addr)
+			ethernet_phy_set(port_num, pd->phy_addr);
+
+		if (pd->port_config || pd->force_port_config)
+			mp->port_config = pd->port_config;
+
+		if (pd->port_config_extend || pd->force_port_config_extend)
+			mp->port_config_extend = pd->port_config_extend;
+
+		if (pd->port_sdma_config || pd->force_port_sdma_config)
+			mp->port_sdma_config = pd->port_sdma_config;
+
+		if (pd->port_serial_control || pd->force_port_serial_control)
+			mp->port_serial_control = pd->port_serial_control;
+
+		if (pd->rx_queue_size)
+			mp->rx_ring_size = pd->rx_queue_size;
+
+		if (pd->tx_queue_size)
+			mp->tx_ring_size = pd->tx_queue_size;
+
+		if (pd->tx_sram_size) {
+			mp->tx_sram_size = pd->tx_sram_size;
+			mp->tx_sram_addr = pd->tx_sram_addr;
+		}
+
+		if (pd->rx_sram_size) {
+			mp->rx_sram_size = pd->rx_sram_size;
+			mp->rx_sram_addr = pd->rx_sram_addr;
+		}
+	}
+
+	err = ethernet_phy_detect(port_num);
+	if (err) {
+		pr_debug("MV643xx ethernet port %d: "
+					"No PHY detected at addr %d\n",
+					port_num, ethernet_phy_get(port_num));
+		return err;
+	}
+
+	err = register_netdev(dev);
+	if (err)
+		goto out;
+
+	p = dev->dev_addr;
+	printk(KERN_NOTICE
+		"%s: port %d with MAC address %02x:%02x:%02x:%02x:%02x:%02x\n",
+		dev->name, port_num, p[0], p[1], p[2], p[3], p[4], p[5]);
+
+	if (dev->features & NETIF_F_SG)
+		printk(KERN_NOTICE "%s: Scatter Gather Enabled\n", dev->name);
+
+	if (dev->features & NETIF_F_IP_CSUM)
+		printk(KERN_NOTICE "%s: TX TCP/IP Checksumming Supported\n",
+								dev->name);
+
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+	printk(KERN_NOTICE "%s: RX TCP/UDP Checksum Offload ON \n", dev->name);
+#endif
+
+#ifdef MV643XX_COAL
+	printk(KERN_NOTICE "%s: TX and RX Interrupt Coalescing ON \n",
+								dev->name);
+#endif
+
+#ifdef MV643XX_NAPI
+	printk(KERN_NOTICE "%s: RX NAPI Enabled \n", dev->name);
+#endif
+
+	return 0;
+
+out:
+	free_netdev(dev);
+
+	return err;
+}
+
+static int mv643xx_eth_remove(struct device *ddev)
+{
+	struct net_device *dev = dev_get_drvdata(ddev);
+
+	unregister_netdev(dev);
+	flush_scheduled_work();
+
+	free_netdev(dev);
+	dev_set_drvdata(ddev, NULL);
+	return 0;
+}
+
+static int mv643xx_eth_shared_probe(struct device *ddev)
+{
+	struct platform_device *pdev = to_platform_device(ddev);
+	struct resource *res;
+
+	printk(KERN_NOTICE "MV-643xx 10/100/1000 Ethernet Driver\n");
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL)
+		return -ENODEV;
+
+	mv643xx_eth_shared_base = ioremap(res->start,
+						MV643XX_ETH_SHARED_REGS_SIZE);
+	if (mv643xx_eth_shared_base == NULL)
+		return -ENOMEM;
+
+	return 0;
+
+}
+
+static int mv643xx_eth_shared_remove(struct device *ddev)
+{
+	iounmap(mv643xx_eth_shared_base);
+	mv643xx_eth_shared_base = NULL;
+
+	return 0;
+}
+
+static struct device_driver mv643xx_eth_driver = {
+	.name = MV643XX_ETH_NAME,
+	.bus = &platform_bus_type,
+	.probe = mv643xx_eth_probe,
+	.remove = mv643xx_eth_remove,
+};
+
+static struct device_driver mv643xx_eth_shared_driver = {
+	.name = MV643XX_ETH_SHARED_NAME,
+	.bus = &platform_bus_type,
+	.probe = mv643xx_eth_shared_probe,
+	.remove = mv643xx_eth_shared_remove,
+};
+
+/*
+ * mv643xx_init_module
+ *
+ * Registers the network drivers into the Linux kernel
+ *
+ * Input :	N/A
+ *
+ * Output :	N/A
+ */
+static int __init mv643xx_init_module(void)
+{
+	int rc;
+
+	rc = driver_register(&mv643xx_eth_shared_driver);
+	if (!rc) {
+		rc = driver_register(&mv643xx_eth_driver);
+		if (rc)
+			driver_unregister(&mv643xx_eth_shared_driver);
+	}
+	return rc;
+}
+
+/*
+ * mv643xx_cleanup_module
+ *
+ * Registers the network drivers into the Linux kernel
+ *
+ * Input :	N/A
+ *
+ * Output :	N/A
+ */
+static void __exit mv643xx_cleanup_module(void)
+{
+	driver_unregister(&mv643xx_eth_driver);
+	driver_unregister(&mv643xx_eth_shared_driver);
+}
+
+module_init(mv643xx_init_module);
+module_exit(mv643xx_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR(	"Rabeeh Khoury, Assaf Hoffman, Matthew Dharm, Manish Lachwani"
+		" and Dale Farnsworth");
+MODULE_DESCRIPTION("Ethernet driver for Marvell MV643XX");
+
+/*
+ * The second part is the low level driver of the gigE ethernet ports.
+ */
+
+/*
+ * Marvell's Gigabit Ethernet controller low level driver
+ *
+ * DESCRIPTION:
+ *	This file introduce low level API to Marvell's Gigabit Ethernet
+ *		controller. This Gigabit Ethernet Controller driver API controls
+ *		1) Operations (i.e. port init, start, reset etc').
+ *		2) Data flow (i.e. port send, receive etc').
+ *		Each Gigabit Ethernet port is controlled via
+ *		struct mv643xx_private.
+ *		This struct includes user configuration information as well as
+ *		driver internal data needed for its operations.
+ *
+ *		Supported Features:
+ *		- This low level driver is OS independent. Allocating memory for
+ *		  the descriptor rings and buffers are not within the scope of
+ *		  this driver.
+ *		- The user is free from Rx/Tx queue managing.
+ *		- This low level driver introduce functionality API that enable
+ *		  the to operate Marvell's Gigabit Ethernet Controller in a
+ *		  convenient way.
+ *		- Simple Gigabit Ethernet port operation API.
+ *		- Simple Gigabit Ethernet port data flow API.
+ *		- Data flow and operation API support per queue functionality.
+ *		- Support cached descriptors for better performance.
+ *		- Enable access to all four DRAM banks and internal SRAM memory
+ *		  spaces.
+ *		- PHY access and control API.
+ *		- Port control register configuration API.
+ *		- Full control over Unicast and Multicast MAC configurations.
+ *
+ *		Operation flow:
+ *
+ *		Initialization phase
+ *		This phase complete the initialization of the the
+ *		mv643xx_private struct.
+ *		User information regarding port configuration has to be set
+ *		prior to calling the port initialization routine.
+ *
+ *		In this phase any port Tx/Rx activity is halted, MIB counters
+ *		are cleared, PHY address is set according to user parameter and
+ *		access to DRAM and internal SRAM memory spaces.
+ *
+ *		Driver ring initialization
+ *		Allocating memory for the descriptor rings and buffers is not
+ *		within the scope of this driver. Thus, the user is required to
+ *		allocate memory for the descriptors ring and buffers. Those
+ *		memory parameters are used by the Rx and Tx ring initialization
+ *		routines in order to curve the descriptor linked list in a form
+ *		of a ring.
+ *		Note: Pay special attention to alignment issues when using
+ *		cached descriptors/buffers. In this phase the driver store
+ *		information in the mv643xx_private struct regarding each queue
+ *		ring.
+ *
+ *		Driver start
+ *		This phase prepares the Ethernet port for Rx and Tx activity.
+ *		It uses the information stored in the mv643xx_private struct to
+ *		initialize the various port registers.
+ *
+ *		Data flow:
+ *		All packet references to/from the driver are done using
+ *		struct pkt_info.
+ *		This struct is a unified struct used with Rx and Tx operations.
+ *		This way the user is not required to be familiar with neither
+ *		Tx nor Rx descriptors structures.
+ *		The driver's descriptors rings are management by indexes.
+ *		Those indexes controls the ring resources and used to indicate
+ *		a SW resource error:
+ *		'current'
+ *		This index points to the current available resource for use. For
+ *		example in Rx process this index will point to the descriptor
+ *		that will be passed to the user upon calling the receive
+ *		routine.  In Tx process, this index will point to the descriptor
+ *		that will be assigned with the user packet info and transmitted.
+ *		'used'
+ *		This index points to the descriptor that need to restore its
+ *		resources. For example in Rx process, using the Rx buffer return
+ *		API will attach the buffer returned in packet info to the
+ *		descriptor pointed by 'used'. In Tx process, using the Tx
+ *		descriptor return will merely return the user packet info with
+ *		the command status of the transmitted buffer pointed by the
+ *		'used' index. Nevertheless, it is essential to use this routine
+ *		to update the 'used' index.
+ *		'first'
+ *		This index supports Tx Scatter-Gather. It points to the first
+ *		descriptor of a packet assembled of multiple buffers. For
+ *		example when in middle of Such packet we have a Tx resource
+ *		error the 'curr' index get the value of 'first' to indicate
+ *		that the ring returned to its state before trying to transmit
+ *		this packet.
+ *
+ *		Receive operation:
+ *		The eth_port_receive API set the packet information struct,
+ *		passed by the caller, with received information from the
+ *		'current' SDMA descriptor.
+ *		It is the user responsibility to return this resource back
+ *		to the Rx descriptor ring to enable the reuse of this source.
+ *		Return Rx resource is done using the eth_rx_return_buff API.
+ *
+ *		Transmit operation:
+ *		The eth_port_send API supports Scatter-Gather which enables to
+ *		send a packet spanned over multiple buffers. This means that
+ *		for each packet info structure given by the user and put into
+ *		the Tx descriptors ring, will be transmitted only if the 'LAST'
+ *		bit will be set in the packet info command status field. This
+ *		API also consider restriction regarding buffer alignments and
+ *		sizes.
+ *		The user must return a Tx resource after ensuring the buffer
+ *		has been transmitted to enable the Tx ring indexes to update.
+ *
+ *		BOARD LAYOUT
+ *		This device is on-board.  No jumper diagram is necessary.
+ *
+ *		EXTERNAL INTERFACE
+ *
+ *	Prior to calling the initialization routine eth_port_init() the user
+ *	must set the following fields under mv643xx_private struct:
+ *	port_num		User Ethernet port number.
+ *	port_mac_addr[6]	User defined port MAC address.
+ *	port_config		User port configuration value.
+ *	port_config_extend	User port config extend value.
+ *	port_sdma_config	User port SDMA config value.
+ *	port_serial_control	User port serial control value.
+ *
+ *		This driver data flow is done using the struct pkt_info which
+ *		is a unified struct for Rx and Tx operations:
+ *
+ *		byte_cnt	Tx/Rx descriptor buffer byte count.
+ *		l4i_chk		CPU provided TCP Checksum. For Tx operation
+ *				only.
+ *		cmd_sts		Tx/Rx descriptor command status.
+ *		buf_ptr		Tx/Rx descriptor buffer pointer.
+ *		return_info	Tx/Rx user resource return information.
+ */
+
+/* defines */
+/* SDMA command macros */
+#define ETH_ENABLE_TX_QUEUE(eth_port) \
+	mv_write(MV643XX_ETH_TRANSMIT_QUEUE_COMMAND_REG(eth_port), 1)
+
+/* locals */
+
+/* PHY routines */
+static int ethernet_phy_get(unsigned int eth_port_num);
+static void ethernet_phy_set(unsigned int eth_port_num, int phy_addr);
+
+/* Ethernet Port routines */
+static int eth_port_uc_addr(unsigned int eth_port_num, unsigned char uc_nibble,
+								int option);
+
+/*
+ * eth_port_init - Initialize the Ethernet port driver
+ *
+ * DESCRIPTION:
+ *	This function prepares the ethernet port to start its activity:
+ *	1) Completes the ethernet port driver struct initialization toward port
+ *		start routine.
+ *	2) Resets the device to a quiescent state in case of warm reboot.
+ *	3) Enable SDMA access to all four DRAM banks as well as internal SRAM.
+ *	4) Clean MAC tables. The reset status of those tables is unknown.
+ *	5) Set PHY address.
+ *	Note: Call this routine prior to eth_port_start routine and after
+ *	setting user values in the user fields of Ethernet port control
+ *	struct.
+ *
+ * INPUT:
+ *	struct mv643xx_private *mp	Ethernet port control struct
+ *
+ * OUTPUT:
+ *	See description.
+ *
+ * RETURN:
+ *	None.
+ */
+static void eth_port_init(struct mv643xx_private *mp)
+{
+	mp->port_rx_queue_command = 0;
+	mp->port_tx_queue_command = 0;
+
+	mp->rx_resource_err = 0;
+	mp->tx_resource_err = 0;
+
+	eth_port_reset(mp->port_num);
+
+	eth_port_init_mac_tables(mp->port_num);
+
+	ethernet_phy_reset(mp->port_num);
+}
+
+/*
+ * eth_port_start - Start the Ethernet port activity.
+ *
+ * DESCRIPTION:
+ *	This routine prepares the Ethernet port for Rx and Tx activity:
+ *	 1. Initialize Tx and Rx Current Descriptor Pointer for each queue that
+ *	    has been initialized a descriptor's ring (using
+ *	    ether_init_tx_desc_ring for Tx and ether_init_rx_desc_ring for Rx)
+ *	 2. Initialize and enable the Ethernet configuration port by writing to
+ *	    the port's configuration and command registers.
+ *	 3. Initialize and enable the SDMA by writing to the SDMA's
+ *	    configuration and command registers.  After completing these steps,
+ *	    the ethernet port SDMA can starts to perform Rx and Tx activities.
+ *
+ *	Note: Each Rx and Tx queue descriptor's list must be initialized prior
+ *	to calling this function (use ether_init_tx_desc_ring for Tx queues
+ *	and ether_init_rx_desc_ring for Rx queues).
+ *
+ * INPUT:
+ *	struct mv643xx_private *mp	Ethernet port control struct
+ *
+ * OUTPUT:
+ *	Ethernet port is ready to receive and transmit.
+ *
+ * RETURN:
+ *	None.
+ */
+static void eth_port_start(struct mv643xx_private *mp)
+{
+	unsigned int port_num = mp->port_num;
+	int tx_curr_desc, rx_curr_desc;
+
+	/* Assignment of Tx CTRP of given queue */
+	tx_curr_desc = mp->tx_curr_desc_q;
+	mv_write(MV643XX_ETH_TX_CURRENT_QUEUE_DESC_PTR_0(port_num),
+		(u32)((struct eth_tx_desc *)mp->tx_desc_dma + tx_curr_desc));
+
+	/* Assignment of Rx CRDP of given queue */
+	rx_curr_desc = mp->rx_curr_desc_q;
+	mv_write(MV643XX_ETH_RX_CURRENT_QUEUE_DESC_PTR_0(port_num),
+		(u32)((struct eth_rx_desc *)mp->rx_desc_dma + rx_curr_desc));
+
+	/* Add the assigned Ethernet address to the port's address table */
+	eth_port_uc_addr_set(port_num, mp->port_mac_addr);
+
+	/* Assign port configuration and command. */
+	mv_write(MV643XX_ETH_PORT_CONFIG_REG(port_num), mp->port_config);
+
+	mv_write(MV643XX_ETH_PORT_CONFIG_EXTEND_REG(port_num),
+						mp->port_config_extend);
+
+
+	/* Increase the Rx side buffer size if supporting GigE */
+	if (mp->port_serial_control & MV643XX_ETH_SET_GMII_SPEED_TO_1000)
+		mv_write(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num),
+			(mp->port_serial_control & 0xfff1ffff) | (0x5 << 17));
+	else
+		mv_write(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num),
+						mp->port_serial_control);
+
+	mv_write(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num),
+		mv_read(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num)) |
+						MV643XX_ETH_SERIAL_PORT_ENABLE);
+
+	/* Assign port SDMA configuration */
+	mv_write(MV643XX_ETH_SDMA_CONFIG_REG(port_num),
+							mp->port_sdma_config);
+
+	/* Enable port Rx. */
+	mv_write(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num),
+						mp->port_rx_queue_command);
+}
+
+/*
+ * eth_port_uc_addr_set - This function Set the port Unicast address.
+ *
+ * DESCRIPTION:
+ *		This function Set the port Ethernet MAC address.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Port number.
+ *	char *		p_addr		Address to be set
+ *
+ * OUTPUT:
+ *	Set MAC address low and high registers. also calls eth_port_uc_addr()
+ *	To set the unicast table with the proper information.
+ *
+ * RETURN:
+ *	N/A.
+ *
+ */
+static void eth_port_uc_addr_set(unsigned int eth_port_num,
+							unsigned char *p_addr)
+{
+	unsigned int mac_h;
+	unsigned int mac_l;
+
+	mac_l = (p_addr[4] << 8) | (p_addr[5]);
+	mac_h = (p_addr[0] << 24) | (p_addr[1] << 16) | (p_addr[2] << 8) |
+							(p_addr[3] << 0);
+
+	mv_write(MV643XX_ETH_MAC_ADDR_LOW(eth_port_num), mac_l);
+	mv_write(MV643XX_ETH_MAC_ADDR_HIGH(eth_port_num), mac_h);
+
+	/* Accept frames of this address */
+	eth_port_uc_addr(eth_port_num, p_addr[5], ACCEPT_MAC_ADDR);
+
+	return;
+}
+
+/*
+ * eth_port_uc_addr_get - This function retrieves the port Unicast address
+ * (MAC address) from the ethernet hw registers.
+ *
+ * DESCRIPTION:
+ *		This function retrieves the port Ethernet MAC address.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Port number.
+ *	char		*MacAddr	pointer where the MAC address is stored
+ *
+ * OUTPUT:
+ *	Copy the MAC address to the location pointed to by MacAddr
+ *
+ * RETURN:
+ *	N/A.
+ *
+ */
+static void eth_port_uc_addr_get(struct net_device *dev, unsigned char *p_addr)
+{
+	struct mv643xx_private *mp = netdev_priv(dev);
+	unsigned int mac_h;
+	unsigned int mac_l;
+
+	mac_h = mv_read(MV643XX_ETH_MAC_ADDR_HIGH(mp->port_num));
+	mac_l = mv_read(MV643XX_ETH_MAC_ADDR_LOW(mp->port_num));
+
+	p_addr[0] = (mac_h >> 24) & 0xff;
+	p_addr[1] = (mac_h >> 16) & 0xff;
+	p_addr[2] = (mac_h >> 8) & 0xff;
+	p_addr[3] = mac_h & 0xff;
+	p_addr[4] = (mac_l >> 8) & 0xff;
+	p_addr[5] = mac_l & 0xff;
+}
+
+/*
+ * eth_port_uc_addr - This function Set the port unicast address table
+ *
+ * DESCRIPTION:
+ *	This function locates the proper entry in the Unicast table for the
+ *	specified MAC nibble and sets its properties according to function
+ *	parameters.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Port number.
+ *	unsigned char	uc_nibble	Unicast MAC Address last nibble.
+ *	int 		option		0 = Add, 1 = remove address.
+ *
+ * OUTPUT:
+ *	This function add/removes MAC addresses from the port unicast address
+ *	table.
+ *
+ * RETURN:
+ *	true is output succeeded.
+ *	false if option parameter is invalid.
+ *
+ */
+static int eth_port_uc_addr(unsigned int eth_port_num, unsigned char uc_nibble,
+								int option)
+{
+	unsigned int unicast_reg;
+	unsigned int tbl_offset;
+	unsigned int reg_offset;
+
+	/* Locate the Unicast table entry */
+	uc_nibble = (0xf & uc_nibble);
+	tbl_offset = (uc_nibble / 4) * 4;	/* Register offset from unicast table base */
+	reg_offset = uc_nibble % 4;	/* Entry offset within the above register */
+
+	switch (option) {
+	case REJECT_MAC_ADDR:
+		/* Clear accepts frame bit at given unicast DA table entry */
+		unicast_reg = mv_read((MV643XX_ETH_DA_FILTER_UNICAST_TABLE_BASE
+						(eth_port_num) + tbl_offset));
+
+		unicast_reg &= (0x0E << (8 * reg_offset));
+
+		mv_write((MV643XX_ETH_DA_FILTER_UNICAST_TABLE_BASE
+				(eth_port_num) + tbl_offset), unicast_reg);
+		break;
+
+	case ACCEPT_MAC_ADDR:
+		/* Set accepts frame bit at unicast DA filter table entry */
+		unicast_reg =
+			mv_read((MV643XX_ETH_DA_FILTER_UNICAST_TABLE_BASE
+						(eth_port_num) + tbl_offset));
+
+		unicast_reg |= (0x01 << (8 * reg_offset));
+
+		mv_write((MV643XX_ETH_DA_FILTER_UNICAST_TABLE_BASE
+				(eth_port_num) + tbl_offset), unicast_reg);
+
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * eth_port_init_mac_tables - Clear all entrance in the UC, SMC and OMC tables
+ *
+ * DESCRIPTION:
+ *	Go through all the DA filter tables (Unicast, Special Multicast &
+ *	Other Multicast) and set each entry to 0.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	Multicast and Unicast packets are rejected.
+ *
+ * RETURN:
+ *	None.
+ */
+static void eth_port_init_mac_tables(unsigned int eth_port_num)
+{
+	int table_index;
+
+	/* Clear DA filter unicast table (Ex_dFUT) */
+	for (table_index = 0; table_index <= 0xC; table_index += 4)
+		mv_write((MV643XX_ETH_DA_FILTER_UNICAST_TABLE_BASE
+					(eth_port_num) + table_index), 0);
+
+	for (table_index = 0; table_index <= 0xFC; table_index += 4) {
+		/* Clear DA filter special multicast table (Ex_dFSMT) */
+		mv_write((MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE
+					(eth_port_num) + table_index), 0);
+		/* Clear DA filter other multicast table (Ex_dFOMT) */
+		mv_write((MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE
+					(eth_port_num) + table_index), 0);
+	}
+}
+
+/*
+ * eth_clear_mib_counters - Clear all MIB counters
+ *
+ * DESCRIPTION:
+ *	This function clears all MIB counters of a specific ethernet port.
+ *	A read from the MIB counter will reset the counter.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	After reading all MIB counters, the counters resets.
+ *
+ * RETURN:
+ *	MIB counter value.
+ *
+ */
+static void eth_clear_mib_counters(unsigned int eth_port_num)
+{
+	int i;
+
+	/* Perform dummy reads from MIB counters */
+	for (i = ETH_MIB_GOOD_OCTETS_RECEIVED_LOW; i < ETH_MIB_LATE_COLLISION;
+									i += 4)
+		mv_read(MV643XX_ETH_MIB_COUNTERS_BASE(eth_port_num) + i);
+}
+
+static inline u32 read_mib(struct mv643xx_private *mp, int offset)
+{
+	return mv_read(MV643XX_ETH_MIB_COUNTERS_BASE(mp->port_num) + offset);
+}
+
+static void eth_update_mib_counters(struct mv643xx_private *mp)
+{
+	struct mv643xx_mib_counters *p = &mp->mib_counters;
+	int offset;
+
+	p->good_octets_received +=
+		read_mib(mp, ETH_MIB_GOOD_OCTETS_RECEIVED_LOW);
+	p->good_octets_received +=
+		(u64)read_mib(mp, ETH_MIB_GOOD_OCTETS_RECEIVED_HIGH) << 32;
+
+	for (offset = ETH_MIB_BAD_OCTETS_RECEIVED;
+			offset <= ETH_MIB_FRAMES_1024_TO_MAX_OCTETS;
+			offset += 4)
+		*(u32 *)((char *)p + offset) = read_mib(mp, offset);
+
+	p->good_octets_sent += read_mib(mp, ETH_MIB_GOOD_OCTETS_SENT_LOW);
+	p->good_octets_sent +=
+		(u64)read_mib(mp, ETH_MIB_GOOD_OCTETS_SENT_HIGH) << 32;
+
+	for (offset = ETH_MIB_GOOD_FRAMES_SENT;
+			offset <= ETH_MIB_LATE_COLLISION;
+			offset += 4)
+		*(u32 *)((char *)p + offset) = read_mib(mp, offset);
+}
+
+/*
+ * ethernet_phy_detect - Detect whether a phy is present
+ *
+ * DESCRIPTION:
+ *	This function tests whether there is a PHY present on
+ *	the specified port.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	None
+ *
+ * RETURN:
+ *	0 on success
+ *	-ENODEV on failure
+ *
+ */
+static int ethernet_phy_detect(unsigned int port_num)
+{
+	unsigned int phy_reg_data0;
+	int auto_neg;
+
+	eth_port_read_smi_reg(port_num, 0, &phy_reg_data0);
+	auto_neg = phy_reg_data0 & 0x1000;
+	phy_reg_data0 ^= 0x1000;	/* invert auto_neg */
+	eth_port_write_smi_reg(port_num, 0, phy_reg_data0);
+
+	eth_port_read_smi_reg(port_num, 0, &phy_reg_data0);
+	if ((phy_reg_data0 & 0x1000) == auto_neg)
+		return -ENODEV;				/* change didn't take */
+
+	phy_reg_data0 ^= 0x1000;
+	eth_port_write_smi_reg(port_num, 0, phy_reg_data0);
+	return 0;
+}
+
+/*
+ * ethernet_phy_get - Get the ethernet port PHY address.
+ *
+ * DESCRIPTION:
+ *	This routine returns the given ethernet port PHY address.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	None.
+ *
+ * RETURN:
+ *	PHY address.
+ *
+ */
+static int ethernet_phy_get(unsigned int eth_port_num)
+{
+	unsigned int reg_data;
+
+	reg_data = mv_read(MV643XX_ETH_PHY_ADDR_REG);
+
+	return ((reg_data >> (5 * eth_port_num)) & 0x1f);
+}
+
+/*
+ * ethernet_phy_set - Set the ethernet port PHY address.
+ *
+ * DESCRIPTION:
+ *	This routine sets the given ethernet port PHY address.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *	int		phy_addr	PHY address.
+ *
+ * OUTPUT:
+ *	None.
+ *
+ * RETURN:
+ *	None.
+ *
+ */
+static void ethernet_phy_set(unsigned int eth_port_num, int phy_addr)
+{
+	u32 reg_data;
+	int addr_shift = 5 * eth_port_num;
+
+	reg_data = mv_read(MV643XX_ETH_PHY_ADDR_REG);
+	reg_data &= ~(0x1f << addr_shift);
+	reg_data |= (phy_addr & 0x1f) << addr_shift;
+	mv_write(MV643XX_ETH_PHY_ADDR_REG, reg_data);
+}
+
+/*
+ * ethernet_phy_reset - Reset Ethernet port PHY.
+ *
+ * DESCRIPTION:
+ *	This routine utilizes the SMI interface to reset the ethernet port PHY.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	The PHY is reset.
+ *
+ * RETURN:
+ *	None.
+ *
+ */
+static void ethernet_phy_reset(unsigned int eth_port_num)
+{
+	unsigned int phy_reg_data;
+
+	/* Reset the PHY */
+	eth_port_read_smi_reg(eth_port_num, 0, &phy_reg_data);
+	phy_reg_data |= 0x8000;	/* Set bit 15 to reset the PHY */
+	eth_port_write_smi_reg(eth_port_num, 0, phy_reg_data);
+}
+
+/*
+ * eth_port_reset - Reset Ethernet port
+ *
+ * DESCRIPTION:
+ * 	This routine resets the chip by aborting any SDMA engine activity and
+ *	clearing the MIB counters. The Receiver and the Transmit unit are in
+ *	idle state after this command is performed and the port is disabled.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	Channel activity is halted.
+ *
+ * RETURN:
+ *	None.
+ *
+ */
+static void eth_port_reset(unsigned int port_num)
+{
+	unsigned int reg_data;
+
+	/* Stop Tx port activity. Check port Tx activity. */
+	reg_data = mv_read(MV643XX_ETH_TRANSMIT_QUEUE_COMMAND_REG(port_num));
+
+	if (reg_data & 0xFF) {
+		/* Issue stop command for active channels only */
+		mv_write(MV643XX_ETH_TRANSMIT_QUEUE_COMMAND_REG(port_num),
+							(reg_data << 8));
+
+		/* Wait for all Tx activity to terminate. */
+		/* Check port cause register that all Tx queues are stopped */
+		while (mv_read(MV643XX_ETH_TRANSMIT_QUEUE_COMMAND_REG(port_num))
+									& 0xFF)
+			udelay(10);
+	}
+
+	/* Stop Rx port activity. Check port Rx activity. */
+	reg_data = mv_read(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num));
+
+	if (reg_data & 0xFF) {
+		/* Issue stop command for active channels only */
+		mv_write(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num),
+							(reg_data << 8));
+
+		/* Wait for all Rx activity to terminate. */
+		/* Check port cause register that all Rx queues are stopped */
+		while (mv_read(MV643XX_ETH_RECEIVE_QUEUE_COMMAND_REG(port_num))
+									& 0xFF)
+			udelay(10);
+	}
+
+	/* Clear all MIB counters */
+	eth_clear_mib_counters(port_num);
+
+	/* Reset the Enable bit in the Configuration Register */
+	reg_data = mv_read(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num));
+	reg_data &= ~MV643XX_ETH_SERIAL_PORT_ENABLE;
+	mv_write(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num), reg_data);
+}
+
+/*
+ * ethernet_set_config_reg - Set specified bits in configuration register.
+ *
+ * DESCRIPTION:
+ *	This function sets specified bits in the given ethernet
+ *	configuration register.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *	unsigned int	value		32 bit value.
+ *
+ * OUTPUT:
+ *	The set bits in the value parameter are set in the configuration
+ *	register.
+ *
+ * RETURN:
+ *	None.
+ *
+ */
+static void ethernet_set_config_reg(unsigned int eth_port_num,
+							unsigned int value)
+{
+	unsigned int eth_config_reg;
+
+	eth_config_reg = mv_read(MV643XX_ETH_PORT_CONFIG_REG(eth_port_num));
+	eth_config_reg |= value;
+	mv_write(MV643XX_ETH_PORT_CONFIG_REG(eth_port_num), eth_config_reg);
+}
+
+static int eth_port_autoneg_supported(unsigned int eth_port_num)
+{
+	unsigned int phy_reg_data0;
+
+	eth_port_read_smi_reg(eth_port_num, 0, &phy_reg_data0);
+
+	return phy_reg_data0 & 0x1000;
+}
+
+static int eth_port_link_is_up(unsigned int eth_port_num)
+{
+	unsigned int phy_reg_data1;
+
+	eth_port_read_smi_reg(eth_port_num, 1, &phy_reg_data1);
+
+	if (eth_port_autoneg_supported(eth_port_num)) {
+		if (phy_reg_data1 & 0x20)	/* auto-neg complete */
+			return 1;
+	} else if (phy_reg_data1 & 0x4)		/* link up */
+		return 1;
+
+	return 0;
+}
+
+/*
+ * ethernet_get_config_reg - Get the port configuration register
+ *
+ * DESCRIPTION:
+ *	This function returns the configuration register value of the given
+ *	ethernet port.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *
+ * OUTPUT:
+ *	None.
+ *
+ * RETURN:
+ *	Port configuration register value.
+ */
+static unsigned int ethernet_get_config_reg(unsigned int eth_port_num)
+{
+	unsigned int eth_config_reg;
+
+	eth_config_reg = mv_read(MV643XX_ETH_PORT_CONFIG_EXTEND_REG
+								(eth_port_num));
+	return eth_config_reg;
+}
+
+/*
+ * eth_port_read_smi_reg - Read PHY registers
+ *
+ * DESCRIPTION:
+ *	This routine utilize the SMI interface to interact with the PHY in
+ *	order to perform PHY register read.
+ *
+ * INPUT:
+ *	unsigned int	port_num	Ethernet Port number.
+ *	unsigned int	phy_reg		PHY register address offset.
+ *	unsigned int	*value		Register value buffer.
+ *
+ * OUTPUT:
+ *	Write the value of a specified PHY register into given buffer.
+ *
+ * RETURN:
+ *	false if the PHY is busy or read data is not in valid state.
+ *	true otherwise.
+ *
+ */
+static void eth_port_read_smi_reg(unsigned int port_num,
+				unsigned int phy_reg, unsigned int *value)
+{
+	int phy_addr = ethernet_phy_get(port_num);
+	unsigned long flags;
+	int i;
+
+	/* the SMI register is a shared resource */
+	spin_lock_irqsave(&mv643xx_eth_phy_lock, flags);
+
+	/* wait for the SMI register to become available */
+	for (i = 0; mv_read(MV643XX_ETH_SMI_REG) & ETH_SMI_BUSY; i++) {
+		if (i == PHY_WAIT_ITERATIONS) {
+			printk("mv643xx PHY busy timeout, port %d\n", port_num);
+			goto out;
+		}
+		udelay(PHY_WAIT_MICRO_SECONDS);
+	}
+
+	mv_write(MV643XX_ETH_SMI_REG,
+		(phy_addr << 16) | (phy_reg << 21) | ETH_SMI_OPCODE_READ);
+
+	/* now wait for the data to be valid */
+	for (i = 0; !(mv_read(MV643XX_ETH_SMI_REG) & ETH_SMI_READ_VALID); i++) {
+		if (i == PHY_WAIT_ITERATIONS) {
+			printk("mv643xx PHY read timeout, port %d\n", port_num);
+			goto out;
+		}
+		udelay(PHY_WAIT_MICRO_SECONDS);
+	}
+
+	*value = mv_read(MV643XX_ETH_SMI_REG) & 0xffff;
+out:
+	spin_unlock_irqrestore(&mv643xx_eth_phy_lock, flags);
+}
+
+/*
+ * eth_port_write_smi_reg - Write to PHY registers
+ *
+ * DESCRIPTION:
+ *	This routine utilize the SMI interface to interact with the PHY in
+ *	order to perform writes to PHY registers.
+ *
+ * INPUT:
+ *	unsigned int	eth_port_num	Ethernet Port number.
+ *	unsigned int	phy_reg		PHY register address offset.
+ *	unsigned int	value		Register value.
+ *
+ * OUTPUT:
+ *	Write the given value to the specified PHY register.
+ *
+ * RETURN:
+ *	false if the PHY is busy.
+ *	true otherwise.
+ *
+ */
+static void eth_port_write_smi_reg(unsigned int eth_port_num,
+				   unsigned int phy_reg, unsigned int value)
+{
+	int phy_addr;
+	int i;
+	unsigned long flags;
+
+	phy_addr = ethernet_phy_get(eth_port_num);
+
+	/* the SMI register is a shared resource */
+	spin_lock_irqsave(&mv643xx_eth_phy_lock, flags);
+
+	/* wait for the SMI register to become available */
+	for (i = 0; mv_read(MV643XX_ETH_SMI_REG) & ETH_SMI_BUSY; i++) {
+		if (i == PHY_WAIT_ITERATIONS) {
+			printk("mv643xx PHY busy timeout, port %d\n",
+								eth_port_num);
+			goto out;
+		}
+		udelay(PHY_WAIT_MICRO_SECONDS);
+	}
+
+	mv_write(MV643XX_ETH_SMI_REG, (phy_addr << 16) | (phy_reg << 21) |
+				ETH_SMI_OPCODE_WRITE | (value & 0xffff));
+out:
+	spin_unlock_irqrestore(&mv643xx_eth_phy_lock, flags);
+}
+
+/*
+ * eth_port_send - Send an Ethernet packet
+ *
+ * DESCRIPTION:
+ *	This routine send a given packet described by p_pktinfo parameter. It
+ *	supports transmitting of a packet spaned over multiple buffers. The
+ *	routine updates 'curr' and 'first' indexes according to the packet
+ *	segment passed to the routine. In case the packet segment is first,
+ *	the 'first' index is update. In any case, the 'curr' index is updated.
+ *	If the routine get into Tx resource error it assigns 'curr' index as
+ *	'first'. This way the function can abort Tx process of multiple
+ *	descriptors per packet.
+ *
+ * INPUT:
+ *	struct mv643xx_private	*mp		Ethernet Port Control srtuct.
+ *	struct pkt_info		*p_pkt_info	User packet buffer.
+ *
+ * OUTPUT:
+ *	Tx ring 'curr' and 'first' indexes are updated.
+ *
+ * RETURN:
+ *	ETH_QUEUE_FULL in case of Tx resource error.
+ *	ETH_ERROR in case the routine can not access Tx desc ring.
+ *	ETH_QUEUE_LAST_RESOURCE if the routine uses the last Tx resource.
+ *	ETH_OK otherwise.
+ *
+ */
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+/*
+ * Modified to include the first descriptor pointer in case of SG
+ */
+static ETH_FUNC_RET_STATUS eth_port_send(struct mv643xx_private *mp,
+					 struct pkt_info *p_pkt_info)
+{
+	int tx_desc_curr, tx_desc_used, tx_first_desc, tx_next_desc;
+	struct eth_tx_desc *current_descriptor;
+	struct eth_tx_desc *first_descriptor;
+	u32 command;
+
+	/* Do not process Tx ring in case of Tx ring resource error */
+	if (mp->tx_resource_err)
+		return ETH_QUEUE_FULL;
+
+	/*
+	 * The hardware requires that each buffer that is <= 8 bytes
+	 * in length must be aligned on an 8 byte boundary.
+	 */
+	if (p_pkt_info->byte_cnt <= 8 && p_pkt_info->buf_ptr & 0x7) {
+		printk(KERN_ERR
+			"mv643xx_eth port %d: packet size <= 8 problem\n",
+			mp->port_num);
+		return ETH_ERROR;
+	}
+
+	/* Get the Tx Desc ring indexes */
+	tx_desc_curr = mp->tx_curr_desc_q;
+	tx_desc_used = mp->tx_used_desc_q;
+
+	current_descriptor = &mp->p_tx_desc_area[tx_desc_curr];
+
+	tx_next_desc = (tx_desc_curr + 1) % mp->tx_ring_size;
+
+	current_descriptor->buf_ptr = p_pkt_info->buf_ptr;
+	current_descriptor->byte_cnt = p_pkt_info->byte_cnt;
+	current_descriptor->l4i_chk = p_pkt_info->l4i_chk;
+	mp->tx_skb[tx_desc_curr] = p_pkt_info->return_info;
+
+	command = p_pkt_info->cmd_sts | ETH_ZERO_PADDING | ETH_GEN_CRC |
+							ETH_BUFFER_OWNED_BY_DMA;
+	if (command & ETH_TX_FIRST_DESC) {
+		tx_first_desc = tx_desc_curr;
+		mp->tx_first_desc_q = tx_first_desc;
+		first_descriptor = current_descriptor;
+		mp->tx_first_command = command;
+	} else {
+		tx_first_desc = mp->tx_first_desc_q;
+		first_descriptor = &mp->p_tx_desc_area[tx_first_desc];
+		BUG_ON(first_descriptor == NULL);
+		current_descriptor->cmd_sts = command;
+	}
+
+	if (command & ETH_TX_LAST_DESC) {
+		wmb();
+		first_descriptor->cmd_sts = mp->tx_first_command;
+
+		wmb();
+		ETH_ENABLE_TX_QUEUE(mp->port_num);
+
+		/*
+		 * Finish Tx packet. Update first desc in case of Tx resource
+		 * error */
+		tx_first_desc = tx_next_desc;
+		mp->tx_first_desc_q = tx_first_desc;
+	}
+
+	/* Check for ring index overlap in the Tx desc ring */
+	if (tx_next_desc == tx_desc_used) {
+		mp->tx_resource_err = 1;
+		mp->tx_curr_desc_q = tx_first_desc;
+
+		return ETH_QUEUE_LAST_RESOURCE;
+	}
+
+	mp->tx_curr_desc_q = tx_next_desc;
+
+	return ETH_OK;
+}
+#else
+static ETH_FUNC_RET_STATUS eth_port_send(struct mv643xx_private *mp,
+					 struct pkt_info *p_pkt_info)
+{
+	int tx_desc_curr;
+	int tx_desc_used;
+	struct eth_tx_desc *current_descriptor;
+	unsigned int command_status;
+
+	/* Do not process Tx ring in case of Tx ring resource error */
+	if (mp->tx_resource_err)
+		return ETH_QUEUE_FULL;
+
+	/* Get the Tx Desc ring indexes */
+	tx_desc_curr = mp->tx_curr_desc_q;
+	tx_desc_used = mp->tx_used_desc_q;
+	current_descriptor = &mp->p_tx_desc_area[tx_desc_curr];
+
+	command_status = p_pkt_info->cmd_sts | ETH_ZERO_PADDING | ETH_GEN_CRC;
+	current_descriptor->buf_ptr = p_pkt_info->buf_ptr;
+	current_descriptor->byte_cnt = p_pkt_info->byte_cnt;
+	mp->tx_skb[tx_desc_curr] = p_pkt_info->return_info;
+
+	/* Set last desc with DMA ownership and interrupt enable. */
+	wmb();
+	current_descriptor->cmd_sts = command_status |
+			ETH_BUFFER_OWNED_BY_DMA | ETH_TX_ENABLE_INTERRUPT;
+
+	wmb();
+	ETH_ENABLE_TX_QUEUE(mp->port_num);
+
+	/* Finish Tx packet. Update first desc in case of Tx resource error */
+	tx_desc_curr = (tx_desc_curr + 1) % mp->tx_ring_size;
+
+	/* Update the current descriptor */
+	mp->tx_curr_desc_q = tx_desc_curr;
+
+	/* Check for ring index overlap in the Tx desc ring */
+	if (tx_desc_curr == tx_desc_used) {
+		mp->tx_resource_err = 1;
+		return ETH_QUEUE_LAST_RESOURCE;
+	}
+
+	return ETH_OK;
+}
+#endif
+
+/*
+ * eth_tx_return_desc - Free all used Tx descriptors
+ *
+ * DESCRIPTION:
+ *	This routine returns the transmitted packet information to the caller.
+ *	It uses the 'first' index to support Tx desc return in case a transmit
+ *	of a packet spanned over multiple buffer still in process.
+ *	In case the Tx queue was in "resource error" condition, where there are
+ *	no available Tx resources, the function resets the resource error flag.
+ *
+ * INPUT:
+ *	struct mv643xx_private	*mp		Ethernet Port Control srtuct.
+ *	struct pkt_info		*p_pkt_info	User packet buffer.
+ *
+ * OUTPUT:
+ *	Tx ring 'first' and 'used' indexes are updated.
+ *
+ * RETURN:
+ *	ETH_ERROR in case the routine can not access Tx desc ring.
+ *	ETH_RETRY in case there is transmission in process.
+ *	ETH_END_OF_JOB if the routine has nothing to release.
+ *	ETH_OK otherwise.
+ *
+ */
+static ETH_FUNC_RET_STATUS eth_tx_return_desc(struct mv643xx_private *mp,
+						struct pkt_info *p_pkt_info)
+{
+	int tx_desc_used;
+#ifdef MV643XX_CHECKSUM_OFFLOAD_TX
+	int tx_busy_desc = mp->tx_first_desc_q;
+#else
+	int tx_busy_desc = mp->tx_curr_desc_q;
+#endif
+	struct eth_tx_desc *p_tx_desc_used;
+	unsigned int command_status;
+
+	/* Get the Tx Desc ring indexes */
+	tx_desc_used = mp->tx_used_desc_q;
+
+	p_tx_desc_used = &mp->p_tx_desc_area[tx_desc_used];
+
+	/* Sanity check */
+	if (p_tx_desc_used == NULL)
+		return ETH_ERROR;
+
+	/* Stop release. About to overlap the current available Tx descriptor */
+	if (tx_desc_used == tx_busy_desc && !mp->tx_resource_err)
+		return ETH_END_OF_JOB;
+
+	command_status = p_tx_desc_used->cmd_sts;
+
+	/* Still transmitting... */
+	if (command_status & (ETH_BUFFER_OWNED_BY_DMA))
+		return ETH_RETRY;
+
+	/* Pass the packet information to the caller */
+	p_pkt_info->cmd_sts = command_status;
+	p_pkt_info->return_info = mp->tx_skb[tx_desc_used];
+	mp->tx_skb[tx_desc_used] = NULL;
+
+	/* Update the next descriptor to release. */
+	mp->tx_used_desc_q = (tx_desc_used + 1) % mp->tx_ring_size;
+
+	/* Any Tx return cancels the Tx resource error status */
+	mp->tx_resource_err = 0;
+
+	return ETH_OK;
+}
+
+/*
+ * eth_port_receive - Get received information from Rx ring.
+ *
+ * DESCRIPTION:
+ * 	This routine returns the received data to the caller. There is no
+ *	data copying during routine operation. All information is returned
+ *	using pointer to packet information struct passed from the caller.
+ *	If the routine exhausts Rx ring resources then the resource error flag
+ *	is set.
+ *
+ * INPUT:
+ *	struct mv643xx_private	*mp		Ethernet Port Control srtuct.
+ *	struct pkt_info		*p_pkt_info	User packet buffer.
+ *
+ * OUTPUT:
+ *	Rx ring current and used indexes are updated.
+ *
+ * RETURN:
+ *	ETH_ERROR in case the routine can not access Rx desc ring.
+ *	ETH_QUEUE_FULL if Rx ring resources are exhausted.
+ *	ETH_END_OF_JOB if there is no received data.
+ *	ETH_OK otherwise.
+ */
+static ETH_FUNC_RET_STATUS eth_port_receive(struct mv643xx_private *mp,
+						struct pkt_info *p_pkt_info)
+{
+	int rx_next_curr_desc, rx_curr_desc, rx_used_desc;
+	volatile struct eth_rx_desc *p_rx_desc;
+	unsigned int command_status;
+
+	/* Do not process Rx ring in case of Rx ring resource error */
+	if (mp->rx_resource_err)
+		return ETH_QUEUE_FULL;
+
+	/* Get the Rx Desc ring 'curr and 'used' indexes */
+	rx_curr_desc = mp->rx_curr_desc_q;
+	rx_used_desc = mp->rx_used_desc_q;
+
+	p_rx_desc = &mp->p_rx_desc_area[rx_curr_desc];
+
+	/* The following parameters are used to save readings from memory */
+	command_status = p_rx_desc->cmd_sts;
+	rmb();
+
+	/* Nothing to receive... */
+	if (command_status & (ETH_BUFFER_OWNED_BY_DMA))
+		return ETH_END_OF_JOB;
+
+	p_pkt_info->byte_cnt = (p_rx_desc->byte_cnt) - RX_BUF_OFFSET;
+	p_pkt_info->cmd_sts = command_status;
+	p_pkt_info->buf_ptr = (p_rx_desc->buf_ptr) + RX_BUF_OFFSET;
+	p_pkt_info->return_info = mp->rx_skb[rx_curr_desc];
+	p_pkt_info->l4i_chk = p_rx_desc->buf_size;
+
+	/* Clean the return info field to indicate that the packet has been */
+	/* moved to the upper layers					    */
+	mp->rx_skb[rx_curr_desc] = NULL;
+
+	/* Update current index in data structure */
+	rx_next_curr_desc = (rx_curr_desc + 1) % mp->rx_ring_size;
+	mp->rx_curr_desc_q = rx_next_curr_desc;
+
+	/* Rx descriptors exhausted. Set the Rx ring resource error flag */
+	if (rx_next_curr_desc == rx_used_desc)
+		mp->rx_resource_err = 1;
+
+	return ETH_OK;
+}
+
+/*
+ * eth_rx_return_buff - Returns a Rx buffer back to the Rx ring.
+ *
+ * DESCRIPTION:
+ *	This routine returns a Rx buffer back to the Rx ring. It retrieves the
+ *	next 'used' descriptor and attached the returned buffer to it.
+ *	In case the Rx ring was in "resource error" condition, where there are
+ *	no available Rx resources, the function resets the resource error flag.
+ *
+ * INPUT:
+ *	struct mv643xx_private	*mp		Ethernet Port Control srtuct.
+ *	struct pkt_info		*p_pkt_info	Information on returned buffer.
+ *
+ * OUTPUT:
+ *	New available Rx resource in Rx descriptor ring.
+ *
+ * RETURN:
+ *	ETH_ERROR in case the routine can not access Rx desc ring.
+ *	ETH_OK otherwise.
+ */
+static ETH_FUNC_RET_STATUS eth_rx_return_buff(struct mv643xx_private *mp,
+						struct pkt_info *p_pkt_info)
+{
+	int used_rx_desc;	/* Where to return Rx resource */
+	volatile struct eth_rx_desc *p_used_rx_desc;
+
+	/* Get 'used' Rx descriptor */
+	used_rx_desc = mp->rx_used_desc_q;
+	p_used_rx_desc = &mp->p_rx_desc_area[used_rx_desc];
+
+	p_used_rx_desc->buf_ptr = p_pkt_info->buf_ptr;
+	p_used_rx_desc->buf_size = p_pkt_info->byte_cnt;
+	mp->rx_skb[used_rx_desc] = p_pkt_info->return_info;
+
+	/* Flush the write pipe */
+
+	/* Return the descriptor to DMA ownership */
+	wmb();
+	p_used_rx_desc->cmd_sts =
+			ETH_BUFFER_OWNED_BY_DMA | ETH_RX_ENABLE_INTERRUPT;
+	wmb();
+
+	/* Move the used descriptor pointer to the next descriptor */
+	mp->rx_used_desc_q = (used_rx_desc + 1) % mp->rx_ring_size;
+
+	/* Any Rx return cancels the Rx resource error status */
+	mp->rx_resource_err = 0;
+
+	return ETH_OK;
+}
+
+/************* Begin ethtool support *************************/
+
+struct mv643xx_stats {
+	char stat_string[ETH_GSTRING_LEN];
+	int sizeof_stat;
+	int stat_offset;
+};
+
+#define MV643XX_STAT(m) sizeof(((struct mv643xx_private *)0)->m), \
+		      offsetof(struct mv643xx_private, m)
+
+static const struct mv643xx_stats mv643xx_gstrings_stats[] = {
+	{ "rx_packets", MV643XX_STAT(stats.rx_packets) },
+	{ "tx_packets", MV643XX_STAT(stats.tx_packets) },
+	{ "rx_bytes", MV643XX_STAT(stats.rx_bytes) },
+	{ "tx_bytes", MV643XX_STAT(stats.tx_bytes) },
+	{ "rx_errors", MV643XX_STAT(stats.rx_errors) },
+	{ "tx_errors", MV643XX_STAT(stats.tx_errors) },
+	{ "rx_dropped", MV643XX_STAT(stats.rx_dropped) },
+	{ "tx_dropped", MV643XX_STAT(stats.tx_dropped) },
+	{ "good_octets_received", MV643XX_STAT(mib_counters.good_octets_received) },
+	{ "bad_octets_received", MV643XX_STAT(mib_counters.bad_octets_received) },
+	{ "internal_mac_transmit_err", MV643XX_STAT(mib_counters.internal_mac_transmit_err) },
+	{ "good_frames_received", MV643XX_STAT(mib_counters.good_frames_received) },
+	{ "bad_frames_received", MV643XX_STAT(mib_counters.bad_frames_received) },
+	{ "broadcast_frames_received", MV643XX_STAT(mib_counters.broadcast_frames_received) },
+	{ "multicast_frames_received", MV643XX_STAT(mib_counters.multicast_frames_received) },
+	{ "frames_64_octets", MV643XX_STAT(mib_counters.frames_64_octets) },
+	{ "frames_65_to_127_octets", MV643XX_STAT(mib_counters.frames_65_to_127_octets) },
+	{ "frames_128_to_255_octets", MV643XX_STAT(mib_counters.frames_128_to_255_octets) },
+	{ "frames_256_to_511_octets", MV643XX_STAT(mib_counters.frames_256_to_511_octets) },
+	{ "frames_512_to_1023_octets", MV643XX_STAT(mib_counters.frames_512_to_1023_octets) },
+	{ "frames_1024_to_max_octets", MV643XX_STAT(mib_counters.frames_1024_to_max_octets) },
+	{ "good_octets_sent", MV643XX_STAT(mib_counters.good_octets_sent) },
+	{ "good_frames_sent", MV643XX_STAT(mib_counters.good_frames_sent) },
+	{ "excessive_collision", MV643XX_STAT(mib_counters.excessive_collision) },
+	{ "multicast_frames_sent", MV643XX_STAT(mib_counters.multicast_frames_sent) },
+	{ "broadcast_frames_sent", MV643XX_STAT(mib_counters.broadcast_frames_sent) },
+	{ "unrec_mac_control_received", MV643XX_STAT(mib_counters.unrec_mac_control_received) },
+	{ "fc_sent", MV643XX_STAT(mib_counters.fc_sent) },
+	{ "good_fc_received", MV643XX_STAT(mib_counters.good_fc_received) },
+	{ "bad_fc_received", MV643XX_STAT(mib_counters.bad_fc_received) },
+	{ "undersize_received", MV643XX_STAT(mib_counters.undersize_received) },
+	{ "fragments_received", MV643XX_STAT(mib_counters.fragments_received) },
+	{ "oversize_received", MV643XX_STAT(mib_counters.oversize_received) },
+	{ "jabber_received", MV643XX_STAT(mib_counters.jabber_received) },
+	{ "mac_receive_error", MV643XX_STAT(mib_counters.mac_receive_error) },
+	{ "bad_crc_event", MV643XX_STAT(mib_counters.bad_crc_event) },
+	{ "collision", MV643XX_STAT(mib_counters.collision) },
+	{ "late_collision", MV643XX_STAT(mib_counters.late_collision) },
+};
+
+#define MV643XX_STATS_LEN	\
+	sizeof(mv643xx_gstrings_stats) / sizeof(struct mv643xx_stats)
+
+static int
+mv643xx_get_settings(struct net_device *netdev, struct ethtool_cmd *ecmd)
+{
+	struct mv643xx_private *mp = netdev->priv;
+	int port_num = mp->port_num;
+	int autoneg = eth_port_autoneg_supported(port_num);
+	int mode_10_bit;
+	int auto_duplex;
+	int half_duplex = 0;
+	int full_duplex = 0;
+	int auto_speed;
+	int speed_10 = 0;
+	int speed_100 = 0;
+	int speed_1000 = 0;
+
+	u32 pcs = mv_read(MV643XX_ETH_PORT_SERIAL_CONTROL_REG(port_num));
+	u32 psr = mv_read(MV643XX_ETH_PORT_STATUS_REG(port_num));
+
+	mode_10_bit = psr & MV643XX_ETH_PORT_STATUS_MODE_10_BIT;
+
+	if (mode_10_bit) {
+		ecmd->supported = SUPPORTED_10baseT_Half;
+	} else {
+		ecmd->supported = (SUPPORTED_10baseT_Half		|
+				   SUPPORTED_10baseT_Full		|
+				   SUPPORTED_100baseT_Half		|
+				   SUPPORTED_100baseT_Full		|
+				   SUPPORTED_1000baseT_Full		|
+				   (autoneg ? SUPPORTED_Autoneg : 0)	|
+				   SUPPORTED_TP);
+
+		auto_duplex = !(pcs & MV643XX_ETH_DISABLE_AUTO_NEG_FOR_DUPLX);
+		auto_speed = !(pcs & MV643XX_ETH_DISABLE_AUTO_NEG_SPEED_GMII);
+
+		ecmd->advertising = ADVERTISED_TP;
+
+		if (autoneg) {
+			ecmd->advertising |= ADVERTISED_Autoneg;
+
+			if (auto_duplex) {
+				half_duplex = 1;
+				full_duplex = 1;
+			} else {
+				if (pcs & MV643XX_ETH_SET_FULL_DUPLEX_MODE)
+					full_duplex = 1;
+				else
+					half_duplex = 1;
+			}
+
+			if (auto_speed) {
+				speed_10 = 1;
+				speed_100 = 1;
+				speed_1000 = 1;
+			} else {
+				if (pcs & MV643XX_ETH_SET_GMII_SPEED_TO_1000)
+					speed_1000 = 1;
+				else if (pcs & MV643XX_ETH_SET_MII_SPEED_TO_100)
+					speed_100 = 1;
+				else
+					speed_10 = 1;
+			}
+
+			if (speed_10 & half_duplex)
+				ecmd->advertising |= ADVERTISED_10baseT_Half;
+			if (speed_10 & full_duplex)
+				ecmd->advertising |= ADVERTISED_10baseT_Full;
+			if (speed_100 & half_duplex)
+				ecmd->advertising |= ADVERTISED_100baseT_Half;
+			if (speed_100 & full_duplex)
+				ecmd->advertising |= ADVERTISED_100baseT_Full;
+			if (speed_1000)
+				ecmd->advertising |= ADVERTISED_1000baseT_Full;
+		}
+	}
+
+	ecmd->port = PORT_TP;
+	ecmd->phy_address = ethernet_phy_get(port_num);
+
+	ecmd->transceiver = XCVR_EXTERNAL;
+
+	if (netif_carrier_ok(netdev)) {
+		if (mode_10_bit)
+			ecmd->speed = SPEED_10;
+		else {
+			if (psr & MV643XX_ETH_PORT_STATUS_GMII_1000)
+				ecmd->speed = SPEED_1000;
+			else if (psr & MV643XX_ETH_PORT_STATUS_MII_100)
+				ecmd->speed = SPEED_100;
+			else
+				ecmd->speed = SPEED_10;
+		}
+
+		if (psr & MV643XX_ETH_PORT_STATUS_FULL_DUPLEX)
+			ecmd->duplex = DUPLEX_FULL;
+		else
+			ecmd->duplex = DUPLEX_HALF;
+	} else {
+		ecmd->speed = -1;
+		ecmd->duplex = -1;
+	}
+
+	ecmd->autoneg = autoneg ? AUTONEG_ENABLE : AUTONEG_DISABLE;
+	return 0;
+}
+
+static void
+mv643xx_get_drvinfo(struct net_device *netdev,
+                       struct ethtool_drvinfo *drvinfo)
+{
+	strncpy(drvinfo->driver,  mv643xx_driver_name, 32);
+	strncpy(drvinfo->version, mv643xx_driver_version, 32);
+	strncpy(drvinfo->fw_version, "N/A", 32);
+	strncpy(drvinfo->bus_info, "mv643xx", 32);
+	drvinfo->n_stats = MV643XX_STATS_LEN;
+}
+
+static int 
+mv643xx_get_stats_count(struct net_device *netdev)
+{
+	return MV643XX_STATS_LEN;
+}
+
+static void 
+mv643xx_get_ethtool_stats(struct net_device *netdev, 
+		struct ethtool_stats *stats, uint64_t *data)
+{
+	struct mv643xx_private *mp = netdev->priv;
+	int i;
+
+	eth_update_mib_counters(mp);
+
+	for(i = 0; i < MV643XX_STATS_LEN; i++) {
+		char *p = (char *)mp+mv643xx_gstrings_stats[i].stat_offset;	
+		data[i] = (mv643xx_gstrings_stats[i].sizeof_stat == 
+			sizeof(uint64_t)) ? *(uint64_t *)p : *(uint32_t *)p;
+	}
+}
+
+static void 
+mv643xx_get_strings(struct net_device *netdev, uint32_t stringset, uint8_t *data)
+{
+	int i;
+
+	switch(stringset) {
+	case ETH_SS_STATS:
+		for (i=0; i < MV643XX_STATS_LEN; i++) {
+			memcpy(data + i * ETH_GSTRING_LEN, 
+			mv643xx_gstrings_stats[i].stat_string,
+			ETH_GSTRING_LEN);
+		}
+		break;
+	}
+}
+
+static struct ethtool_ops mv643xx_ethtool_ops = {
+	.get_settings           = mv643xx_get_settings,
+	.get_drvinfo            = mv643xx_get_drvinfo,
+	.get_link               = ethtool_op_get_link,
+	.get_sg			= ethtool_op_get_sg,
+	.set_sg			= ethtool_op_set_sg,
+	.get_strings            = mv643xx_get_strings,
+	.get_stats_count        = mv643xx_get_stats_count,
+	.get_ethtool_stats      = mv643xx_get_ethtool_stats,
+};
+
+/************* End ethtool support *************************/