/*
 * (C) Copyright 2003
 * Ingo Assmus <ingo.assmus@keymile.com>
 *
 * based on - Driver for MV64460X ethernet ports
 * Copyright (C) 2002 rabeeh@galileo.co.il
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 */

/*
 * mv_eth.c - header file for the polled mode GT ethernet driver
 */
#include <common.h>
#include <net.h>
#include <malloc.h>

#include "mv_eth.h"

/* enable Debug outputs */

#undef DEBUG_MV_ETH

#ifdef DEBUG_MV_ETH
#define DEBUG
#define DP(x) x
#else
#define DP(x)
#endif

#undef MV64460_CHECKSUM_OFFLOAD
/*************************************************************************
**************************************************************************
**************************************************************************
*  The first part is the high level driver of the gigE ethernet ports.   *
**************************************************************************
**************************************************************************
*************************************************************************/

/* Definition for configuring driver */
/* #define UPDATE_STATS_BY_SOFTWARE */
#undef MV64460_RX_QUEUE_FILL_ON_TASK


/* Constants */
#define MAGIC_ETH_RUNNING               8031971
#define MV64460_INTERNAL_SRAM_SIZE                      _256K
#define EXTRA_BYTES 32
#define WRAP       ETH_HLEN + 2 + 4 + 16
#define BUFFER_MTU dev->mtu + WRAP
#define INT_CAUSE_UNMASK_ALL            0x0007ffff
#define INT_CAUSE_UNMASK_ALL_EXT        0x0011ffff
#ifdef MV64460_RX_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

/* Read/Write to/from MV64460 internal registers */
#define MV_REG_READ(offset) my_le32_to_cpu(* (volatile unsigned int *) (INTERNAL_REG_BASE_ADDR + offset))
#define MV_REG_WRITE(offset,data) *(volatile unsigned int *) (INTERNAL_REG_BASE_ADDR + offset) = my_cpu_to_le32 (data)
#define MV_SET_REG_BITS(regOffset,bits) ((*((volatile unsigned int*)((INTERNAL_REG_BASE_ADDR) + (regOffset)))) |= ((unsigned int)my_cpu_to_le32(bits)))
#define MV_RESET_REG_BITS(regOffset,bits) ((*((volatile unsigned int*)((INTERNAL_REG_BASE_ADDR) + (regOffset)))) &= ~((unsigned int)my_cpu_to_le32(bits)))

/* Static function declarations */
static int mv64460_eth_real_open (struct eth_device *eth);
static int mv64460_eth_real_stop (struct eth_device *eth);
static struct net_device_stats *mv64460_eth_get_stats (struct eth_device
                                                       *dev);
static void eth_port_init_mac_tables (ETH_PORT eth_port_num);
static void mv64460_eth_update_stat (struct eth_device *dev);
bool db64460_eth_start (struct eth_device *eth);
unsigned int eth_read_mib_counter (ETH_PORT eth_port_num,
                                   unsigned int mib_offset);
int mv64460_eth_receive (struct eth_device *dev);

int mv64460_eth_xmit (struct eth_device *, volatile void *packet, int length);

#ifndef  UPDATE_STATS_BY_SOFTWARE
static void mv64460_eth_print_stat (struct eth_device *dev);
#endif
/* Processes a received packet */
extern void NetReceive (volatile uchar *, int);

extern unsigned int INTERNAL_REG_BASE_ADDR;

/*************************************************
 *Helper functions - used inside the driver only *
 *************************************************/
#ifdef DEBUG_MV_ETH
void print_globals (struct eth_device *dev)
{
        printf ("Ethernet PRINT_Globals-Debug function\n");
        printf ("Base Address for ETH_PORT_INFO:        %08x\n",
                (unsigned int) dev->priv);
        printf ("Base Address for mv64460_eth_priv:     %08x\n",
                (unsigned int) &(((ETH_PORT_INFO *) dev->priv)->
                                 port_private));

        printf ("GT Internal Base Address:      %08x\n",
                INTERNAL_REG_BASE_ADDR);
        printf ("Base Address for TX-DESCs:     %08x    Number of allocated Buffers %d\n", (unsigned int) ((ETH_PORT_INFO *) dev->priv)->p_tx_desc_area_base[0], MV64460_TX_QUEUE_SIZE);
        printf ("Base Address for RX-DESCs:     %08x    Number of allocated Buffers %d\n", (unsigned int) ((ETH_PORT_INFO *) dev->priv)->p_rx_desc_area_base[0], MV64460_RX_QUEUE_SIZE);
        printf ("Base Address for RX-Buffer:    %08x    allocated Bytes %d\n",
                (unsigned int) ((ETH_PORT_INFO *) dev->priv)->
                p_rx_buffer_base[0],
                (MV64460_RX_QUEUE_SIZE * MV64460_RX_BUFFER_SIZE) + 32);
        printf ("Base Address for TX-Buffer:    %08x    allocated Bytes %d\n",
                (unsigned int) ((ETH_PORT_INFO *) dev->priv)->
                p_tx_buffer_base[0],
                (MV64460_TX_QUEUE_SIZE * MV64460_TX_BUFFER_SIZE) + 32);
}
#endif

#define my_cpu_to_le32(x) my_le32_to_cpu((x))

unsigned long my_le32_to_cpu (unsigned long x)
{
        return (((x & 0x000000ffU) << 24) |
                ((x & 0x0000ff00U) << 8) |
                ((x & 0x00ff0000U) >> 8) | ((x & 0xff000000U) >> 24));
}


/**********************************************************************
 * mv64460_eth_print_phy_status
 *
 * Prints gigabit ethenret phy status
 *
 * Input : pointer to ethernet interface network device structure
 * Output : N/A
 **********************************************************************/

static void mv64460_eth_print_phy_status (struct eth_device *dev)
{
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;
        ETH_PORT_INFO *ethernet_private = (ETH_PORT_INFO *) dev->priv;
        unsigned int port_status, phy_reg_data;

        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;

        /* Check Link status on phy */
        eth_port_read_smi_reg (port_num, 1, &phy_reg_data);
        if (!(phy_reg_data & 0x20)) {
                printf ("Ethernet port changed link status to DOWN\n");
        } else {
                port_status =
                        MV_REG_READ (MV64460_ETH_PORT_STATUS_REG (port_num));
                printf ("Ethernet status port %d: Link up", port_num);
                printf (", %s",
                        (port_status & BIT2) ? "Full Duplex" : "Half Duplex");
                if (port_status & BIT4)
                        printf (", Speed 1 Gbps");
                else
                        printf (", %s",
                                (port_status & BIT5) ? "Speed 100 Mbps" :
                                "Speed 10 Mbps");
                printf ("\n");
        }
}

/**********************************************************************
 * u-boot entry functions for mv64460_eth
 *
 **********************************************************************/
int db64460_eth_probe (struct eth_device *dev)
{
        return ((int) db64460_eth_start (dev));
}

int db64460_eth_poll (struct eth_device *dev)
{
        return mv64460_eth_receive (dev);
}

int db64460_eth_transmit (struct eth_device *dev, volatile void *packet,
                          int length)
{
        mv64460_eth_xmit (dev, packet, length);
        return 0;
}

void db64460_eth_disable (struct eth_device *dev)
{
        mv64460_eth_stop (dev);
}


void mv6446x_eth_initialize (bd_t * bis)
{
        struct eth_device *dev;
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        int devnum, x, temp;
        char *s, *e, buf[64];

        for (devnum = 0; devnum < MV_ETH_DEVS; devnum++) {
                dev = calloc (sizeof (*dev), 1);
                if (!dev) {
                        printf ("%s: mv_enet%d allocation failure, %s\n",
                                __FUNCTION__, devnum, "eth_device structure");
                        return;
                }

                /* must be less than NAMESIZE (16) */
                sprintf (dev->name, "mv_enet%d", devnum);

#ifdef DEBUG
                printf ("Initializing %s\n", dev->name);
#endif

                /* Extract the MAC address from the environment */
                switch (devnum) {
                case 0:
                        s = "ethaddr";
                        break;

                case 1:
                        s = "eth1addr";
                        break;

                case 2:
                        s = "eth2addr";
                        break;

                default:        /* this should never happen */
                        printf ("%s: Invalid device number %d\n",
                                __FUNCTION__, devnum);
                        return;
                }

                temp = getenv_f(s, buf, sizeof (buf));
                s = (temp > 0) ? buf : NULL;

#ifdef DEBUG
                printf ("Setting MAC %d to %s\n", devnum, s);
#endif
                for (x = 0; x < 6; ++x) {
                        dev->enetaddr[x] = s ? simple_strtoul (s, &e, 16) : 0;
                        if (s)
                                s = (*e) ? e + 1 : e;
                }
                /* ronen - set the MAC addr in the HW */
                eth_port_uc_addr_set (devnum, dev->enetaddr, 0);

                dev->init = (void *) db64460_eth_probe;
                dev->halt = (void *) ethernet_phy_reset;
                dev->send = (void *) db64460_eth_transmit;
                dev->recv = (void *) db64460_eth_poll;

                ethernet_private = calloc (sizeof (*ethernet_private), 1);
                dev->priv = (void *)ethernet_private;
                if (!ethernet_private) {
                        printf ("%s: %s allocation failure, %s\n",
                                __FUNCTION__, dev->name,
                                "Private Device Structure");
                        free (dev);
                        return;
                }
                /* start with an zeroed ETH_PORT_INFO */
                memset (ethernet_private, 0, sizeof (ETH_PORT_INFO));
                memcpy (ethernet_private->port_mac_addr, dev->enetaddr, 6);

                /* set pointer to memory for stats data structure etc... */
                port_private = calloc (sizeof (*ethernet_private), 1);
                ethernet_private->port_private = (void *)port_private;
                if (!port_private) {
                        printf ("%s: %s allocation failure, %s\n",
                                __FUNCTION__, dev->name,
                                "Port Private Device Structure");

                        free (ethernet_private);
                        free (dev);
                        return;
                }

                port_private->stats =
                        calloc (sizeof (struct net_device_stats), 1);
                if (!port_private->stats) {
                        printf ("%s: %s allocation failure, %s\n",
                                __FUNCTION__, dev->name,
                                "Net stat Structure");

                        free (port_private);
                        free (ethernet_private);
                        free (dev);
                        return;
                }
                memset (ethernet_private->port_private, 0,
                        sizeof (struct mv64460_eth_priv));
                switch (devnum) {
                case 0:
                        ethernet_private->port_num = ETH_0;
                        break;
                case 1:
                        ethernet_private->port_num = ETH_1;
                        break;
                case 2:
                        ethernet_private->port_num = ETH_2;
                        break;
                default:
                        printf ("Invalid device number %d\n", devnum);
                        break;
                };

                port_private->port_num = devnum;
                /*
                 * Read MIB counter on the GT in order to reset them,
                 * then zero all the stats fields in memory
                 */
                mv64460_eth_update_stat (dev);
                memset (port_private->stats, 0,
                        sizeof (struct net_device_stats));
                /* Extract the MAC address from the environment */
                switch (devnum) {
                case 0:
                        s = "ethaddr";
                        break;

                case 1:
                        s = "eth1addr";
                        break;

                case 2:
                        s = "eth2addr";
                        break;

                default:        /* this should never happen */
                        printf ("%s: Invalid device number %d\n",
                                __FUNCTION__, devnum);
                        return;
                }

                temp = getenv_f(s, buf, sizeof (buf));
                s = (temp > 0) ? buf : NULL;

#ifdef DEBUG
                printf ("Setting MAC %d to %s\n", devnum, s);
#endif
                for (x = 0; x < 6; ++x) {
                        dev->enetaddr[x] = s ? simple_strtoul (s, &e, 16) : 0;
                        if (s)
                                s = (*e) ? e + 1 : e;
                }

                DP (printf ("Allocating descriptor and buffer rings\n"));

                ethernet_private->p_rx_desc_area_base[0] =
                        (ETH_RX_DESC *) memalign (16,
                                                  RX_DESC_ALIGNED_SIZE *
                                                  MV64460_RX_QUEUE_SIZE + 1);
                ethernet_private->p_tx_desc_area_base[0] =
                        (ETH_TX_DESC *) memalign (16,
                                                  TX_DESC_ALIGNED_SIZE *
                                                  MV64460_TX_QUEUE_SIZE + 1);

                ethernet_private->p_rx_buffer_base[0] =
                        (char *) memalign (16,
                                           MV64460_RX_QUEUE_SIZE *
                                           MV64460_TX_BUFFER_SIZE + 1);
                ethernet_private->p_tx_buffer_base[0] =
                        (char *) memalign (16,
                                           MV64460_RX_QUEUE_SIZE *
                                           MV64460_TX_BUFFER_SIZE + 1);

#ifdef DEBUG_MV_ETH
                /* DEBUG OUTPUT prints adresses of globals */
                print_globals (dev);
#endif
                eth_register (dev);

        }
        DP (printf ("%s: exit\n", __FUNCTION__));

}

/**********************************************************************
 * mv64460_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
 * / / ronen - changed the output to match  net/eth.c needs
 * Output : nonzero of success , zero if fails.
 * under construction
 **********************************************************************/

int mv64460_eth_open (struct eth_device *dev)
{
        return (mv64460_eth_real_open (dev));
}

/* Helper function for mv64460_eth_open */
static int mv64460_eth_real_open (struct eth_device *dev)
{

        unsigned int queue;
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;
        u32 port_status, phy_reg_data;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        /* ronen - when we update the MAC env params we only update dev->enetaddr
           see ./net/eth.c eth_set_enetaddr() */
        memcpy (ethernet_private->port_mac_addr, dev->enetaddr, 6);

        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;

        /* Stop RX Queues */
        MV_REG_WRITE (MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG (port_num),
                      0x0000ff00);

        /* Clear the ethernet port interrupts */
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_CAUSE_REG (port_num), 0);
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_CAUSE_EXTEND_REG (port_num), 0);

        /* Unmask RX buffer and TX end interrupt */
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_MASK_REG (port_num),
                      INT_CAUSE_UNMASK_ALL);

        /* Unmask phy and link status changes interrupts */
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_EXTEND_MASK_REG (port_num),
                      INT_CAUSE_UNMASK_ALL_EXT);

        /* Set phy address of the port */
        ethernet_private->port_phy_addr = 0x8 + port_num;

        /* Activate the DMA channels etc */
        eth_port_init (ethernet_private);


        /* "Allocate" setup TX rings */

        for (queue = 0; queue < MV64460_TX_QUEUE_NUM; queue++) {
                unsigned int size;

                port_private->tx_ring_size[queue] = MV64460_TX_QUEUE_SIZE;
                size = (port_private->tx_ring_size[queue] * TX_DESC_ALIGNED_SIZE);      /*size = no of DESCs times DESC-size */
                ethernet_private->tx_desc_area_size[queue] = size;

                /* first clear desc area completely */
                memset ((void *) ethernet_private->p_tx_desc_area_base[queue],
                        0, ethernet_private->tx_desc_area_size[queue]);

                /* initialize tx desc ring with low level driver */
                if (ether_init_tx_desc_ring
                    (ethernet_private, ETH_Q0,
                     port_private->tx_ring_size[queue],
                     MV64460_TX_BUFFER_SIZE /* Each Buffer is 1600 Byte */ ,
                     (unsigned int) ethernet_private->
                     p_tx_desc_area_base[queue],
                     (unsigned int) ethernet_private->
                     p_tx_buffer_base[queue]) == false)
                        printf ("### Error initializing TX Ring\n");
        }

        /* "Allocate" setup RX rings */
        for (queue = 0; queue < MV64460_RX_QUEUE_NUM; queue++) {
                unsigned int size;

                /* Meantime RX Ring are fixed - but must be configurable by user */
                port_private->rx_ring_size[queue] = MV64460_RX_QUEUE_SIZE;
                size = (port_private->rx_ring_size[queue] *
                        RX_DESC_ALIGNED_SIZE);
                ethernet_private->rx_desc_area_size[queue] = size;

                /* first clear desc area completely */
                memset ((void *) ethernet_private->p_rx_desc_area_base[queue],
                        0, ethernet_private->rx_desc_area_size[queue]);
                if ((ether_init_rx_desc_ring
                     (ethernet_private, ETH_Q0,
                      port_private->rx_ring_size[queue],
                      MV64460_RX_BUFFER_SIZE /* Each Buffer is 1600 Byte */ ,
                      (unsigned int) ethernet_private->
                      p_rx_desc_area_base[queue],
                      (unsigned int) ethernet_private->
                      p_rx_buffer_base[queue])) == false)
                        printf ("### Error initializing RX Ring\n");
        }

        eth_port_start (ethernet_private);

        /* Set maximum receive buffer to 9700 bytes */
        MV_REG_WRITE (MV64460_ETH_PORT_SERIAL_CONTROL_REG (port_num),
                      (0x5 << 17) |
                      (MV_REG_READ
                       (MV64460_ETH_PORT_SERIAL_CONTROL_REG (port_num))
                       & 0xfff1ffff));

        /*
         * Set ethernet MTU for leaky bucket mechanism to 0 - this will
         * disable the leaky bucket mechanism .
         */

        MV_REG_WRITE (MV64460_ETH_MAXIMUM_TRANSMIT_UNIT (port_num), 0);
        port_status = MV_REG_READ (MV64460_ETH_PORT_STATUS_REG (port_num));

        /* Check Link status on phy */
        eth_port_read_smi_reg (port_num, 1, &phy_reg_data);
        if (!(phy_reg_data & 0x20)) {
                /* Reset PHY */
                if ((ethernet_phy_reset (port_num)) != true) {
                        printf ("$$ Warnning: No link on port %d \n",
                                port_num);
                        return 0;
                } else {
                        eth_port_read_smi_reg (port_num, 1, &phy_reg_data);
                        if (!(phy_reg_data & 0x20)) {
                                printf ("### Error: Phy is not active\n");
                                return 0;
                        }
                }
        } else {
                mv64460_eth_print_phy_status (dev);
        }
        port_private->eth_running = MAGIC_ETH_RUNNING;
        return 1;
}


static int mv64460_eth_free_tx_rings (struct eth_device *dev)
{
        unsigned int queue;
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;
        volatile ETH_TX_DESC *p_tx_curr_desc;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;

        /* Stop Tx Queues */
        MV_REG_WRITE (MV64460_ETH_TRANSMIT_QUEUE_COMMAND_REG (port_num),
                      0x0000ff00);

        /* Free TX rings */
        DP (printf ("Clearing previously allocated TX queues... "));
        for (queue = 0; queue < MV64460_TX_QUEUE_NUM; queue++) {
                /* Free on TX rings */
                for (p_tx_curr_desc =
                     ethernet_private->p_tx_desc_area_base[queue];
                     ((unsigned int) p_tx_curr_desc <= (unsigned int)
                      ethernet_private->p_tx_desc_area_base[queue] +
                      ethernet_private->tx_desc_area_size[queue]);
                     p_tx_curr_desc =
                     (ETH_TX_DESC *) ((unsigned int) p_tx_curr_desc +
                                      TX_DESC_ALIGNED_SIZE)) {
                        /* this is inside for loop */
                        if (p_tx_curr_desc->return_info != 0) {
                                p_tx_curr_desc->return_info = 0;
                                DP (printf ("freed\n"));
                        }
                }
                DP (printf ("Done\n"));
        }
        return 0;
}

static int mv64460_eth_free_rx_rings (struct eth_device *dev)
{
        unsigned int queue;
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;
        volatile ETH_RX_DESC *p_rx_curr_desc;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;


        /* Stop RX Queues */
        MV_REG_WRITE (MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG (port_num),
                      0x0000ff00);

        /* Free RX rings */
        DP (printf ("Clearing previously allocated RX queues... "));
        for (queue = 0; queue < MV64460_RX_QUEUE_NUM; queue++) {
                /* Free preallocated skb's on RX rings */
                for (p_rx_curr_desc =
                     ethernet_private->p_rx_desc_area_base[queue];
                     (((unsigned int) p_rx_curr_desc <
                       ((unsigned int) ethernet_private->
                        p_rx_desc_area_base[queue] +
                        ethernet_private->rx_desc_area_size[queue])));
                     p_rx_curr_desc =
                     (ETH_RX_DESC *) ((unsigned int) p_rx_curr_desc +
                                      RX_DESC_ALIGNED_SIZE)) {
                        if (p_rx_curr_desc->return_info != 0) {
                                p_rx_curr_desc->return_info = 0;
                                DP (printf ("freed\n"));
                        }
                }
                DP (printf ("Done\n"));
        }
        return 0;
}

/**********************************************************************
 * mv64460_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
 *********************************************************************/

int mv64460_eth_stop (struct eth_device *dev)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;

        /* Disable all gigE address decoder */
        MV_REG_WRITE (MV64460_ETH_BASE_ADDR_ENABLE_REG, 0x3f);
        DP (printf ("%s Ethernet stop called ... \n", __FUNCTION__));
        mv64460_eth_real_stop (dev);

        return 0;
};

/* Helper function for mv64460_eth_stop */

static int mv64460_eth_real_stop (struct eth_device *dev)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;


        mv64460_eth_free_tx_rings (dev);
        mv64460_eth_free_rx_rings (dev);

        eth_port_reset (ethernet_private->port_num);
        /* Disable ethernet port interrupts */
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_CAUSE_REG (port_num), 0);
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_CAUSE_EXTEND_REG (port_num), 0);
        /* Mask RX buffer and TX end interrupt */
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_MASK_REG (port_num), 0);
        /* Mask phy and link status changes interrupts */
        MV_REG_WRITE (MV64460_ETH_INTERRUPT_EXTEND_MASK_REG (port_num), 0);
        MV_RESET_REG_BITS (MV64460_CPU_INTERRUPT0_MASK_HIGH,
                           BIT0 << port_num);
        /* Print Network statistics */
#ifndef  UPDATE_STATS_BY_SOFTWARE
        /*
         * Print statistics (only if ethernet is running),
         * then zero all the stats fields in memory
         */
        if (port_private->eth_running == MAGIC_ETH_RUNNING) {
                port_private->eth_running = 0;
                mv64460_eth_print_stat (dev);
        }
        memset (port_private->stats, 0, sizeof (struct net_device_stats));
#endif
        DP (printf ("\nEthernet stopped ... \n"));
        return 0;
}


/**********************************************************************
 * mv64460_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
 **********************************************************************/

int mv64460_eth_xmit (struct eth_device *dev, volatile void *dataPtr,
                      int dataSize)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;
        PKT_INFO pkt_info;
        ETH_FUNC_RET_STATUS status;
        struct net_device_stats *stats;
        ETH_FUNC_RET_STATUS release_result;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;

        stats = port_private->stats;

        /* Update packet info data structure */
        pkt_info.cmd_sts = ETH_TX_FIRST_DESC | ETH_TX_LAST_DESC;        /* DMA owned, first last */
        pkt_info.byte_cnt = dataSize;
        pkt_info.buf_ptr = (unsigned int) dataPtr;
        pkt_info.return_info = 0;

        status = eth_port_send (ethernet_private, ETH_Q0, &pkt_info);
        if ((status == ETH_ERROR) || (status == ETH_QUEUE_FULL)) {
                printf ("Error on transmitting packet ..");
                if (status == ETH_QUEUE_FULL)
                        printf ("ETH Queue is full. \n");
                if (status == ETH_QUEUE_LAST_RESOURCE)
                        printf ("ETH Queue: using last available resource. \n");
                goto error;
        }

        /* Update statistics and start of transmittion time */
        stats->tx_bytes += dataSize;
        stats->tx_packets++;

        /* Check if packet(s) is(are) transmitted correctly (release everything) */
        do {
                release_result =
                        eth_tx_return_desc (ethernet_private, ETH_Q0,
                                            &pkt_info);
                switch (release_result) {
                case ETH_OK:
                        DP (printf ("descriptor released\n"));
                        if (pkt_info.cmd_sts & BIT0) {
                                printf ("Error in TX\n");
                                stats->tx_errors++;

                        }
                        break;
                case ETH_RETRY:
                        DP (printf ("transmission still in process\n"));
                        break;

                case ETH_ERROR:
                        printf ("routine can not access Tx desc ring\n");
                        break;

                case ETH_END_OF_JOB:
                        DP (printf ("the routine has nothing to release\n"));
                        break;
                default:        /* should not happen */
                        break;
                }
        } while (release_result == ETH_OK);


        return 0;               /* success */
      error:
        return 1;               /* Failed - higher layers will free the skb */
}

/**********************************************************************
 * mv64460_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
 **********************************************************************/

int mv64460_eth_receive (struct eth_device *dev)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;
        PKT_INFO pkt_info;
        struct net_device_stats *stats;


        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;
        stats = port_private->stats;

        while ((eth_port_receive (ethernet_private, ETH_Q0, &pkt_info) ==
                ETH_OK)) {

#ifdef DEBUG_MV_ETH
                if (pkt_info.byte_cnt != 0) {
                        printf ("%s: Received %d byte Packet @ 0x%x\n",
                                __FUNCTION__, pkt_info.byte_cnt,
                                pkt_info.buf_ptr);
                }
#endif
                /* Update statistics. Note byte count includes 4 byte CRC count */
                stats->rx_packets++;
                stats->rx_bytes += pkt_info.byte_cnt;

                /*
                 * 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++;

                        printf ("Received packet spread on multiple descriptors\n");

                        /* Is this caused by an error ? */
                        if (pkt_info.cmd_sts & ETH_ERROR_SUMMARY) {
                                stats->rx_errors++;
                        }

                        /* free these descriptors again without forwarding them to the higher layers */
                        pkt_info.buf_ptr &= ~0x7;       /* realign buffer again */
                        pkt_info.byte_cnt = 0x0000;     /* Reset Byte count */

                        if (eth_rx_return_buff
                            (ethernet_private, ETH_Q0, &pkt_info) != ETH_OK) {
                                printf ("Error while returning the RX Desc to Ring\n");
                        } else {
                                DP (printf ("RX Desc returned to Ring\n"));
                        }
                        /* /free these descriptors again */
                } else {

/* !!! call higher layer processing */
#ifdef DEBUG_MV_ETH
                        printf ("\nNow send it to upper layer protocols (NetReceive) ...\n");
#endif
                        /* let the upper layer handle the packet */
                        NetReceive ((uchar *) pkt_info.buf_ptr,
                                    (int) pkt_info.byte_cnt);

/* **************************************************************** */
/* free descriptor  */
                        pkt_info.buf_ptr &= ~0x7;       /* realign buffer again */
                        pkt_info.byte_cnt = 0x0000;     /* Reset Byte count */
                        DP (printf
                            ("RX: pkt_info.buf_ptr =    %x\n",
                             pkt_info.buf_ptr));
                        if (eth_rx_return_buff
                            (ethernet_private, ETH_Q0, &pkt_info) != ETH_OK) {
                                printf ("Error while returning the RX Desc to Ring\n");
                        } else {
                                DP (printf ("RX Desc returned to Ring\n"));
                        }

/* **************************************************************** */

                }
        }
        mv64460_eth_get_stats (dev);    /* update statistics */
        return 1;
}

/**********************************************************************
 * mv64460_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 *mv64460_eth_get_stats (struct eth_device *dev)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        unsigned int port_num;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;

        mv64460_eth_update_stat (dev);

        return port_private->stats;
}


/**********************************************************************
 * mv64460_eth_update_stat
 *
 * Update the statistics structure in the private data structure
 *
 * Input : pointer to ethernet interface network device structure
 * Output : N/A
 **********************************************************************/

static void mv64460_eth_update_stat (struct eth_device *dev)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        struct net_device_stats *stats;
        unsigned int port_num;
        volatile unsigned int dummy;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;
        stats = port_private->stats;

        /* These are false updates */
        stats->rx_packets += (unsigned long)
                eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_GOOD_FRAMES_RECEIVED);
        stats->tx_packets += (unsigned long)
                eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_GOOD_FRAMES_SENT);
        stats->rx_bytes += (unsigned long)
                eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_GOOD_OCTETS_RECEIVED_LOW);
        /*
         * Ideally this should be as follows -
         *
         *   stats->rx_bytes   += stats->rx_bytes +
         * ((unsigned long) ethReadMibCounter (ethernet_private->port_num ,
         * ETH_MIB_GOOD_OCTETS_RECEIVED_HIGH) << 32);
         *
         * But the unsigned long in PowerPC and MIPS are 32bit. So the next read
         * is just a dummy read for proper work of the GigE port
         */
        dummy = eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_GOOD_OCTETS_RECEIVED_HIGH);
        stats->tx_bytes += (unsigned long)
                eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_GOOD_OCTETS_SENT_LOW);
        dummy = eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_GOOD_OCTETS_SENT_HIGH);
        stats->rx_errors += (unsigned long)
                eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_MAC_RECEIVE_ERROR);

        /* Rx dropped is for received packet with CRC error */
        stats->rx_dropped +=
                (unsigned long) eth_read_mib_counter (ethernet_private->
                                                      port_num,
                                                      ETH_MIB_BAD_CRC_EVENT);
        stats->multicast += (unsigned long)
                eth_read_mib_counter (ethernet_private->port_num,
                                      ETH_MIB_MULTICAST_FRAMES_RECEIVED);
        stats->collisions +=
                (unsigned long) eth_read_mib_counter (ethernet_private->
                                                      port_num,
                                                      ETH_MIB_COLLISION) +
                (unsigned long) eth_read_mib_counter (ethernet_private->
                                                      port_num,
                                                      ETH_MIB_LATE_COLLISION);
        /* detailed rx errors */
        stats->rx_length_errors +=
                (unsigned long) eth_read_mib_counter (ethernet_private->
                                                      port_num,
                                                      ETH_MIB_UNDERSIZE_RECEIVED)
                +
                (unsigned long) eth_read_mib_counter (ethernet_private->
                                                      port_num,
                                                      ETH_MIB_OVERSIZE_RECEIVED);
        /* detailed tx errors */
}

#ifndef  UPDATE_STATS_BY_SOFTWARE
/**********************************************************************
 * mv64460_eth_print_stat
 *
 * Update the statistics structure in the private data structure
 *

 * Input : pointer to ethernet interface network device structure
 * Output : N/A
 **********************************************************************/

static void mv64460_eth_print_stat (struct eth_device *dev)
{
        ETH_PORT_INFO *ethernet_private;
        struct mv64460_eth_priv *port_private;
        struct net_device_stats *stats;
        unsigned int port_num;

        ethernet_private = (ETH_PORT_INFO *) dev->priv;
        port_private =
                (struct mv64460_eth_priv *) ethernet_private->port_private;
        port_num = port_private->port_num;
        stats = port_private->stats;

        /* These are false updates */
        printf ("\n### Network statistics: ###\n");
        printf ("--------------------------\n");
        printf (" Packets received:             %ld\n", stats->rx_packets);
        printf (" Packets send:                 %ld\n", stats->tx_packets);
        printf (" Received bytes:               %ld\n", stats->rx_bytes);
        printf (" Send bytes:                   %ld\n", stats->tx_bytes);
        if (stats->rx_errors != 0)
                printf (" Rx Errors:                    %ld\n",
                        stats->rx_errors);
        if (stats->rx_dropped != 0)
                printf (" Rx dropped (CRC Errors):      %ld\n",
                        stats->rx_dropped);
        if (stats->multicast != 0)
                printf (" Rx mulicast frames:           %ld\n",
                        stats->multicast);
        if (stats->collisions != 0)
                printf (" No. of collisions:            %ld\n",
                        stats->collisions);
        if (stats->rx_length_errors != 0)
                printf (" Rx length errors:             %ld\n",
                        stats->rx_length_errors);
}
#endif

/**************************************************************************
 *network_start - Network Kick Off Routine UBoot
 *Inputs :
 *Outputs :
 **************************************************************************/

bool db64460_eth_start (struct eth_device *dev)
{
        return (mv64460_eth_open (dev));        /* calls real open */
}

/*************************************************************************
**************************************************************************
**************************************************************************
*  The second part is the low level driver of the gigE ethernet ports.   *
**************************************************************************
**************************************************************************
*************************************************************************/
/*
 * based on Linux code
 * arch/powerpc/galileo/EVB64460/mv64460_eth.c - Driver for MV64460X ethernet ports
 * Copyright (C) 2002 rabeeh@galileo.co.il

 * 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.
 *
 */

/********************************************************************************
 * 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 ETH_PORT_INFO
 *              struct.
 *              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 ETH_PORT_INFO
 *              struct.
 *              User information regarding port configuration has to be set
 *              prior to calling the port initialization routine. For example,
 *              the user has to assign the port_phy_addr field which is board
 *              depended parameter.
 *              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 ETH_PORT_INFO 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 ETH_PORT_INFO struct to
 *              initialize the various port registers.
 *
 *              Data flow:
 *              All packet references to/from the driver are done using PKT_INFO
 *              struct.
 *              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 ETH_PORT_INFO struct:
 *       port_num             User Ethernet port number.
 *       port_phy_addr              User PHY address of Ethernet port.
 *       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.
 *       *port_virt_to_phys ()  User function to cast virtual addr to CPU bus addr.
 *       *port_private        User scratch pad for user specific data structures.
 *
 *       This driver introduce a set of default values:
 *       PORT_CONFIG_VALUE           Default port configuration value
 *       PORT_CONFIG_EXTEND_VALUE    Default port extend configuration value
 *       PORT_SDMA_CONFIG_VALUE      Default sdma control value
 *       PORT_SERIAL_CONTROL_VALUE   Default port serial control value
 *
 *              This driver data flow is done using the PKT_INFO struct 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.
 *
 *
 *              EXTERNAL SUPPORT REQUIREMENTS
 *
 *              This driver requires the following external support:
 *
 *              D_CACHE_FLUSH_LINE (address, address offset)
 *
 *              This macro applies assembly code to flush and invalidate cache
 *              line.
 *              address        - address base.
 *              address offset - address offset
 *
 *
 *              CPU_PIPE_FLUSH
 *
 *              This macro applies assembly code to flush the CPU pipeline.
 *
 *******************************************************************************/
/* includes */

/* defines */
/* SDMA command macros */
#define ETH_ENABLE_TX_QUEUE(tx_queue, eth_port) \
 MV_REG_WRITE(MV64460_ETH_TRANSMIT_QUEUE_COMMAND_REG(eth_port), (1 << tx_queue))

#define ETH_DISABLE_TX_QUEUE(tx_queue, eth_port) \
 MV_REG_WRITE(MV64460_ETH_TRANSMIT_QUEUE_COMMAND_REG(eth_port),\
 (1 << (8 + tx_queue)))

#define ETH_ENABLE_RX_QUEUE(rx_queue, eth_port) \
MV_REG_WRITE(MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG(eth_port), (1 << rx_queue))

#define ETH_DISABLE_RX_QUEUE(rx_queue, eth_port) \
MV_REG_WRITE(MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG(eth_port), (1 << (8 + rx_queue)))

#define CURR_RFD_GET(p_curr_desc, queue) \
 ((p_curr_desc) = p_eth_port_ctrl->p_rx_curr_desc_q[queue])

#define CURR_RFD_SET(p_curr_desc, queue) \
 (p_eth_port_ctrl->p_rx_curr_desc_q[queue] = (p_curr_desc))

#define USED_RFD_GET(p_used_desc, queue) \
 ((p_used_desc) = p_eth_port_ctrl->p_rx_used_desc_q[queue])

#define USED_RFD_SET(p_used_desc, queue)\
(p_eth_port_ctrl->p_rx_used_desc_q[queue] = (p_used_desc))


#define CURR_TFD_GET(p_curr_desc, queue) \
 ((p_curr_desc) = p_eth_port_ctrl->p_tx_curr_desc_q[queue])

#define CURR_TFD_SET(p_curr_desc, queue) \
 (p_eth_port_ctrl->p_tx_curr_desc_q[queue] = (p_curr_desc))

#define USED_TFD_GET(p_used_desc, queue) \
 ((p_used_desc) = p_eth_port_ctrl->p_tx_used_desc_q[queue])

#define USED_TFD_SET(p_used_desc, queue) \
 (p_eth_port_ctrl->p_tx_used_desc_q[queue] = (p_used_desc))

#define FIRST_TFD_GET(p_first_desc, queue) \
 ((p_first_desc) = p_eth_port_ctrl->p_tx_first_desc_q[queue])

#define FIRST_TFD_SET(p_first_desc, queue) \
 (p_eth_port_ctrl->p_tx_first_desc_q[queue] = (p_first_desc))


/* Macros that save access to desc in order to find next desc pointer  */
#define RX_NEXT_DESC_PTR(p_rx_desc, queue) (ETH_RX_DESC*)(((((unsigned int)p_rx_desc - (unsigned int)p_eth_port_ctrl->p_rx_desc_area_base[queue]) + RX_DESC_ALIGNED_SIZE) % p_eth_port_ctrl->rx_desc_area_size[queue]) + (unsigned int)p_eth_port_ctrl->p_rx_desc_area_base[queue])

#define TX_NEXT_DESC_PTR(p_tx_desc, queue) (ETH_TX_DESC*)(((((unsigned int)p_tx_desc - (unsigned int)p_eth_port_ctrl->p_tx_desc_area_base[queue]) + TX_DESC_ALIGNED_SIZE) % p_eth_port_ctrl->tx_desc_area_size[queue]) + (unsigned int)p_eth_port_ctrl->p_tx_desc_area_base[queue])

#define LINK_UP_TIMEOUT         100000
#define PHY_BUSY_TIMEOUT    10000000

/* locals */

/* PHY routines */
static void ethernet_phy_set (ETH_PORT eth_port_num, int phy_addr);
static int ethernet_phy_get (ETH_PORT eth_port_num);

/* Ethernet Port routines */
static void eth_set_access_control (ETH_PORT eth_port_num,
                                    ETH_WIN_PARAM * param);
static bool eth_port_uc_addr (ETH_PORT eth_port_num, unsigned char uc_nibble,
                              ETH_QUEUE queue, int option);
#if 0                           /* FIXME */
static bool eth_port_smc_addr (ETH_PORT eth_port_num,
                               unsigned char mc_byte,
                               ETH_QUEUE queue, int option);
static bool eth_port_omc_addr (ETH_PORT eth_port_num,
                               unsigned char crc8,
                               ETH_QUEUE queue, int option);
#endif

static void eth_b_copy (unsigned int src_addr, unsigned int dst_addr,
                        int byte_count);

void eth_dbg (ETH_PORT_INFO * p_eth_port_ctrl);


typedef enum _memory_bank { BANK0, BANK1, BANK2, BANK3 } MEMORY_BANK;
u32 mv_get_dram_bank_base_addr (MEMORY_BANK bank)
{
        u32 result = 0;
        u32 enable = MV_REG_READ (MV64460_BASE_ADDR_ENABLE);

        if (enable & (1 << bank))
                return 0;
        if (bank == BANK0)
                result = MV_REG_READ (MV64460_CS_0_BASE_ADDR);
        if (bank == BANK1)
                result = MV_REG_READ (MV64460_CS_1_BASE_ADDR);
        if (bank == BANK2)
                result = MV_REG_READ (MV64460_CS_2_BASE_ADDR);
        if (bank == BANK3)
                result = MV_REG_READ (MV64460_CS_3_BASE_ADDR);
        result &= 0x0000ffff;
        result = result << 16;
        return result;
}

u32 mv_get_dram_bank_size (MEMORY_BANK bank)
{
        u32 result = 0;
        u32 enable = MV_REG_READ (MV64460_BASE_ADDR_ENABLE);

        if (enable & (1 << bank))
                return 0;
        if (bank == BANK0)
                result = MV_REG_READ (MV64460_CS_0_SIZE);
        if (bank == BANK1)
                result = MV_REG_READ (MV64460_CS_1_SIZE);
        if (bank == BANK2)
                result = MV_REG_READ (MV64460_CS_2_SIZE);
        if (bank == BANK3)
                result = MV_REG_READ (MV64460_CS_3_SIZE);
        result += 1;
        result &= 0x0000ffff;
        result = result << 16;
        return result;
}

u32 mv_get_internal_sram_base (void)
{
        u32 result;

        result = MV_REG_READ (MV64460_INTEGRATED_SRAM_BASE_ADDR);
        result &= 0x0000ffff;
        result = result << 16;
        return result;
}

/*******************************************************************************
* 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 (i.e.
*       port_phy_addr).
*
* INPUT:
*       ETH_PORT_INFO   *p_eth_port_ctrl       Ethernet port control struct
*
* OUTPUT:
*       See description.
*
* RETURN:
*       None.
*
*******************************************************************************/
static void eth_port_init (ETH_PORT_INFO * p_eth_port_ctrl)
{
        int queue;
        ETH_WIN_PARAM win_param;

        p_eth_port_ctrl->port_config = PORT_CONFIG_VALUE;
        p_eth_port_ctrl->port_config_extend = PORT_CONFIG_EXTEND_VALUE;
        p_eth_port_ctrl->port_sdma_config = PORT_SDMA_CONFIG_VALUE;
        p_eth_port_ctrl->port_serial_control = PORT_SERIAL_CONTROL_VALUE;

        p_eth_port_ctrl->port_rx_queue_command = 0;
        p_eth_port_ctrl->port_tx_queue_command = 0;

        /* Zero out SW structs */
        for (queue = 0; queue < MAX_RX_QUEUE_NUM; queue++) {
                CURR_RFD_SET ((ETH_RX_DESC *) 0x00000000, queue);
                USED_RFD_SET ((ETH_RX_DESC *) 0x00000000, queue);
                p_eth_port_ctrl->rx_resource_err[queue] = false;
        }

        for (queue = 0; queue < MAX_TX_QUEUE_NUM; queue++) {
                CURR_TFD_SET ((ETH_TX_DESC *) 0x00000000, queue);
                USED_TFD_SET ((ETH_TX_DESC *) 0x00000000, queue);
                FIRST_TFD_SET ((ETH_TX_DESC *) 0x00000000, queue);
                p_eth_port_ctrl->tx_resource_err[queue] = false;
        }

        eth_port_reset (p_eth_port_ctrl->port_num);

        /* Set access parameters for DRAM bank 0 */
        win_param.win = ETH_WIN0;       /* Use Ethernet window 0 */
        win_param.target = ETH_TARGET_DRAM;     /* Window target - DDR  */
        win_param.attributes = EBAR_ATTR_DRAM_CS0;      /* Enable DRAM bank   */
#ifndef CONFIG_NOT_COHERENT_CACHE
        win_param.attributes |= EBAR_ATTR_DRAM_CACHE_COHERENCY_WB;
#endif
        win_param.high_addr = 0;
        /* Get bank base */
        win_param.base_addr = mv_get_dram_bank_base_addr (BANK0);
        win_param.size = mv_get_dram_bank_size (BANK0); /* Get bank size */
        if (win_param.size == 0)
                win_param.enable = 0;
        else
                win_param.enable = 1;   /* Enable the access */
        win_param.access_ctrl = EWIN_ACCESS_FULL;       /* Enable full access */

        /* Set the access control for address window (EPAPR) READ & WRITE */
        eth_set_access_control (p_eth_port_ctrl->port_num, &win_param);

        /* Set access parameters for DRAM bank 1 */
        win_param.win = ETH_WIN1;       /* Use Ethernet window 1 */
        win_param.target = ETH_TARGET_DRAM;     /* Window target - DDR */
        win_param.attributes = EBAR_ATTR_DRAM_CS1;      /* Enable DRAM bank */
#ifndef CONFIG_NOT_COHERENT_CACHE
        win_param.attributes |= EBAR_ATTR_DRAM_CACHE_COHERENCY_WB;
#endif
        win_param.high_addr = 0;
        /* Get bank base */
        win_param.base_addr = mv_get_dram_bank_base_addr (BANK1);
        win_param.size = mv_get_dram_bank_size (BANK1); /* Get bank size */
        if (win_param.size == 0)
                win_param.enable = 0;
        else
                win_param.enable = 1;   /* Enable the access */
        win_param.access_ctrl = EWIN_ACCESS_FULL;       /* Enable full access */

        /* Set the access control for address window (EPAPR) READ & WRITE */
        eth_set_access_control (p_eth_port_ctrl->port_num, &win_param);

        /* Set access parameters for DRAM bank 2 */
        win_param.win = ETH_WIN2;       /* Use Ethernet window 2 */
        win_param.target = ETH_TARGET_DRAM;     /* Window target - DDR */
        win_param.attributes = EBAR_ATTR_DRAM_CS2;      /* Enable DRAM bank */
#ifndef CONFIG_NOT_COHERENT_CACHE
        win_param.attributes |= EBAR_ATTR_DRAM_CACHE_COHERENCY_WB;
#endif
        win_param.high_addr = 0;
        /* Get bank base */
        win_param.base_addr = mv_get_dram_bank_base_addr (BANK2);
        win_param.size = mv_get_dram_bank_size (BANK2); /* Get bank size */
        if (win_param.size == 0)
                win_param.enable = 0;
        else
                win_param.enable = 1;   /* Enable the access */
        win_param.access_ctrl = EWIN_ACCESS_FULL;       /* Enable full access */

        /* Set the access control for address window (EPAPR) READ & WRITE */
        eth_set_access_control (p_eth_port_ctrl->port_num, &win_param);

        /* Set access parameters for DRAM bank 3 */
        win_param.win = ETH_WIN3;       /* Use Ethernet window 3 */
        win_param.target = ETH_TARGET_DRAM;     /* Window target - DDR */
        win_param.attributes = EBAR_ATTR_DRAM_CS3;      /* Enable DRAM bank */
#ifndef CONFIG_NOT_COHERENT_CACHE
        win_param.attributes |= EBAR_ATTR_DRAM_CACHE_COHERENCY_WB;
#endif
        win_param.high_addr = 0;
        /* Get bank base */
        win_param.base_addr = mv_get_dram_bank_base_addr (BANK3);
        win_param.size = mv_get_dram_bank_size (BANK3); /* Get bank size */
        if (win_param.size == 0)
                win_param.enable = 0;
        else
                win_param.enable = 1;   /* Enable the access */
        win_param.access_ctrl = EWIN_ACCESS_FULL;       /* Enable full access */

        /* Set the access control for address window (EPAPR) READ & WRITE */
        eth_set_access_control (p_eth_port_ctrl->port_num, &win_param);

        /* Set access parameters for Internal SRAM */
        win_param.win = ETH_WIN4;       /* Use Ethernet window 0 */
        win_param.target = EBAR_TARGET_CBS;     /* Target - Internal SRAM */
        win_param.attributes = EBAR_ATTR_CBS_SRAM | EBAR_ATTR_CBS_SRAM_BLOCK0;
        win_param.high_addr = 0;
        win_param.base_addr = mv_get_internal_sram_base ();     /* Get base addr */
        win_param.size = MV64460_INTERNAL_SRAM_SIZE;    /* Get bank size */
        win_param.enable = 1;   /* Enable the access */
        win_param.access_ctrl = EWIN_ACCESS_FULL;       /* Enable full access */

        /* Set the access control for address window (EPAPR) READ & WRITE */
        eth_set_access_control (p_eth_port_ctrl->port_num, &win_param);

        eth_port_init_mac_tables (p_eth_port_ctrl->port_num);

        ethernet_phy_set (p_eth_port_ctrl->port_num,
                          p_eth_port_ctrl->port_phy_addr);

        return;

}

/*******************************************************************************
* 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:
*       ETH_PORT_INFO   *p_eth_port_ctrl       Ethernet port control struct
*
* OUTPUT:
*       Ethernet port is ready to receive and transmit.
*
* RETURN:
*       false if the port PHY is not up.
*       true otherwise.
*
*******************************************************************************/
static bool eth_port_start (ETH_PORT_INFO * p_eth_port_ctrl)
{
        int queue;
        volatile ETH_TX_DESC *p_tx_curr_desc;
        volatile ETH_RX_DESC *p_rx_curr_desc;
        unsigned int phy_reg_data;
        ETH_PORT eth_port_num = p_eth_port_ctrl->port_num;


        /* Assignment of Tx CTRP of given queue */
        for (queue = 0; queue < MAX_TX_QUEUE_NUM; queue++) {
                CURR_TFD_GET (p_tx_curr_desc, queue);
                MV_REG_WRITE ((MV64460_ETH_TX_CURRENT_QUEUE_DESC_PTR_0
                               (eth_port_num)
                               + (4 * queue)),
                              ((unsigned int) p_tx_curr_desc));

        }

        /* Assignment of Rx CRDP of given queue */
        for (queue = 0; queue < MAX_RX_QUEUE_NUM; queue++) {
                CURR_RFD_GET (p_rx_curr_desc, queue);
                MV_REG_WRITE ((MV64460_ETH_RX_CURRENT_QUEUE_DESC_PTR_0
                               (eth_port_num)
                               + (4 * queue)),
                              ((unsigned int) p_rx_curr_desc));

                if (p_rx_curr_desc != NULL)
                        /* Add the assigned Ethernet address to the port's address table */
                        eth_port_uc_addr_set (p_eth_port_ctrl->port_num,
                                              p_eth_port_ctrl->port_mac_addr,
                                              queue);
        }

        /* Assign port configuration and command. */
        MV_REG_WRITE (MV64460_ETH_PORT_CONFIG_REG (eth_port_num),
                      p_eth_port_ctrl->port_config);

        MV_REG_WRITE (MV64460_ETH_PORT_CONFIG_EXTEND_REG (eth_port_num),
                      p_eth_port_ctrl->port_config_extend);

        MV_REG_WRITE (MV64460_ETH_PORT_SERIAL_CONTROL_REG (eth_port_num),
                      p_eth_port_ctrl->port_serial_control);

        MV_SET_REG_BITS (MV64460_ETH_PORT_SERIAL_CONTROL_REG (eth_port_num),
                         ETH_SERIAL_PORT_ENABLE);

        /* Assign port SDMA configuration */
        MV_REG_WRITE (MV64460_ETH_SDMA_CONFIG_REG (eth_port_num),
                      p_eth_port_ctrl->port_sdma_config);

        MV_REG_WRITE (MV64460_ETH_TX_QUEUE_0_TOKEN_BUCKET_COUNT
                      (eth_port_num), 0x3fffffff);
        MV_REG_WRITE (MV64460_ETH_TX_QUEUE_0_TOKEN_BUCKET_CONFIG
                      (eth_port_num), 0x03fffcff);
        /* Turn off the port/queue bandwidth limitation */
        MV_REG_WRITE (MV64460_ETH_MAXIMUM_TRANSMIT_UNIT (eth_port_num), 0x0);

        /* Enable port Rx. */
        MV_REG_WRITE (MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG (eth_port_num),
                      p_eth_port_ctrl->port_rx_queue_command);

        /* Check if link is up */
        eth_port_read_smi_reg (eth_port_num, 1, &phy_reg_data);

        if (!(phy_reg_data & 0x20))
                return false;

        return true;
}

/*******************************************************************************
* eth_port_uc_addr_set - This function Set the port Unicast address.
*
* DESCRIPTION:
*               This function Set the port Ethernet MAC address.
*
* INPUT:
*       ETH_PORT eth_port_num     Port number.
*       char *        p_addr            Address to be set
*       ETH_QUEUE         queue         Rx queue number for this MAC address.
*
* 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 (ETH_PORT eth_port_num,
                                  unsigned char *p_addr, ETH_QUEUE queue)
{
        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_REG_WRITE (MV64460_ETH_MAC_ADDR_LOW (eth_port_num), mac_l);
        MV_REG_WRITE (MV64460_ETH_MAC_ADDR_HIGH (eth_port_num), mac_h);

        /* Accept frames of this address */
        eth_port_uc_addr (eth_port_num, p_addr[5], queue, ACCEPT_MAC_ADDR);

        return;
}

/*******************************************************************************
* 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:
*       ETH_PORT        eth_port_num      Port number.
*       unsigned char uc_nibble         Unicast MAC Address last nibble.
*       ETH_QUEUE                queue          Rx queue number for this MAC address.
*       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 bool eth_port_uc_addr (ETH_PORT eth_port_num,
                              unsigned char uc_nibble,
                              ETH_QUEUE queue, 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 specified unicast DA table entry */
                unicast_reg =
                        MV_REG_READ ((MV64460_ETH_DA_FILTER_UNICAST_TABLE_BASE
                                      (eth_port_num)
                                      + tbl_offset));

                unicast_reg &= (0x0E << (8 * reg_offset));

                MV_REG_WRITE ((MV64460_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_REG_READ ((MV64460_ETH_DA_FILTER_UNICAST_TABLE_BASE
                                      (eth_port_num)
                                      + tbl_offset));

                unicast_reg |= ((0x01 | queue) << (8 * reg_offset));

                MV_REG_WRITE ((MV64460_ETH_DA_FILTER_UNICAST_TABLE_BASE
                               (eth_port_num)
                               + tbl_offset), unicast_reg);

                break;

        default:
                return false;
        }
        return true;
}

#if 0                           /* FIXME */
/*******************************************************************************
* eth_port_mc_addr - Multicast address settings.
*
* DESCRIPTION:
*       This API controls the MV device MAC multicast support.
*       The MV device supports multicast using two tables:
*       1) Special Multicast Table for MAC addresses of the form
*          0x01-00-5E-00-00-XX (where XX is between 0x00 and 0x_fF).
*          The MAC DA[7:0] bits are used as a pointer to the Special Multicast
*          Table entries in the DA-Filter table.
*          In this case, the function calls eth_port_smc_addr() routine to set the
*          Special Multicast Table.
*       2) Other Multicast Table for multicast of another type. A CRC-8bit
*          is used as an index to the Other Multicast Table entries in the
*          DA-Filter table.
*          In this case, the function calculates the CRC-8bit value and calls
*          eth_port_omc_addr() routine to set the Other Multicast Table.
* INPUT:
*       ETH_PORT        eth_port_num      Port number.
*       unsigned char   *p_addr         Unicast MAC Address.
*       ETH_QUEUE                queue          Rx queue number for this MAC address.
*       int                     option      0 = Add, 1 = remove address.
*
* OUTPUT:
*       See description.
*
* RETURN:
*       true is output succeeded.
*       false if add_address_table_entry( ) failed.
*
*******************************************************************************/
static void eth_port_mc_addr (ETH_PORT eth_port_num,
                              unsigned char *p_addr,
                              ETH_QUEUE queue, int option)
{
        unsigned int mac_h;
        unsigned int mac_l;
        unsigned char crc_result = 0;
        int mac_array[48];
        int crc[8];
        int i;


        if ((p_addr[0] == 0x01) &&
            (p_addr[1] == 0x00) &&
            (p_addr[2] == 0x5E) && (p_addr[3] == 0x00) && (p_addr[4] == 0x00))

                eth_port_smc_addr (eth_port_num, p_addr[5], queue, option);
        else {
                /* Calculate CRC-8 out of the given address */
                mac_h = (p_addr[0] << 8) | (p_addr[1]);
                mac_l = (p_addr[2] << 24) | (p_addr[3] << 16) |
                        (p_addr[4] << 8) | (p_addr[5] << 0);

                for (i = 0; i < 32; i++)
                        mac_array[i] = (mac_l >> i) & 0x1;
                for (i = 32; i < 48; i++)
                        mac_array[i] = (mac_h >> (i - 32)) & 0x1;


                crc[0] = mac_array[45] ^ mac_array[43] ^ mac_array[40] ^
                        mac_array[39] ^ mac_array[35] ^ mac_array[34] ^
                        mac_array[31] ^ mac_array[30] ^ mac_array[28] ^
                        mac_array[23] ^ mac_array[21] ^ mac_array[19] ^
                        mac_array[18] ^ mac_array[16] ^ mac_array[14] ^
                        mac_array[12] ^ mac_array[8] ^ mac_array[7] ^
                        mac_array[6] ^ mac_array[0];

                crc[1] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^
                        mac_array[43] ^ mac_array[41] ^ mac_array[39] ^
                        mac_array[36] ^ mac_array[34] ^ mac_array[32] ^
                        mac_array[30] ^ mac_array[29] ^ mac_array[28] ^
                        mac_array[24] ^ mac_array[23] ^ mac_array[22] ^
                        mac_array[21] ^ mac_array[20] ^ mac_array[18] ^
                        mac_array[17] ^ mac_array[16] ^ mac_array[15] ^
                        mac_array[14] ^ mac_array[13] ^ mac_array[12] ^
                        mac_array[9] ^ mac_array[6] ^ mac_array[1] ^
                        mac_array[0];

                crc[2] = mac_array[47] ^ mac_array[46] ^ mac_array[44] ^
                        mac_array[43] ^ mac_array[42] ^ mac_array[39] ^
                        mac_array[37] ^ mac_array[34] ^ mac_array[33] ^
                        mac_array[29] ^ mac_array[28] ^ mac_array[25] ^
                        mac_array[24] ^ mac_array[22] ^ mac_array[17] ^
                        mac_array[15] ^ mac_array[13] ^ mac_array[12] ^
                        mac_array[10] ^ mac_array[8] ^ mac_array[6] ^
                        mac_array[2] ^ mac_array[1] ^ mac_array[0];

                crc[3] = mac_array[47] ^ mac_array[45] ^ mac_array[44] ^
                        mac_array[43] ^ mac_array[40] ^ mac_array[38] ^
                        mac_array[35] ^ mac_array[34] ^ mac_array[30] ^
                        mac_array[29] ^ mac_array[26] ^ mac_array[25] ^
                        mac_array[23] ^ mac_array[18] ^ mac_array[16] ^
                        mac_array[14] ^ mac_array[13] ^ mac_array[11] ^
                        mac_array[9] ^ mac_array[7] ^ mac_array[3] ^
                        mac_array[2] ^ mac_array[1];

                crc[4] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^
                        mac_array[41] ^ mac_array[39] ^ mac_array[36] ^
                        mac_array[35] ^ mac_array[31] ^ mac_array[30] ^
                        mac_array[27] ^ mac_array[26] ^ mac_array[24] ^
                        mac_array[19] ^ mac_array[17] ^ mac_array[15] ^
                        mac_array[14] ^ mac_array[12] ^ mac_array[10] ^
                        mac_array[8] ^ mac_array[4] ^ mac_array[3] ^
                        mac_array[2];

                crc[5] = mac_array[47] ^ mac_array[46] ^ mac_array[45] ^
                        mac_array[42] ^ mac_array[40] ^ mac_array[37] ^
                        mac_array[36] ^ mac_array[32] ^ mac_array[31] ^
                        mac_array[28] ^ mac_array[27] ^ mac_array[25] ^
                        mac_array[20] ^ mac_array[18] ^ mac_array[16] ^
                        mac_array[15] ^ mac_array[13] ^ mac_array[11] ^
                        mac_array[9] ^ mac_array[5] ^ mac_array[4] ^
                        mac_array[3];

                crc[6] = mac_array[47] ^ mac_array[46] ^ mac_array[43] ^
                        mac_array[41] ^ mac_array[38] ^ mac_array[37] ^
                        mac_array[33] ^ mac_array[32] ^ mac_array[29] ^
                        mac_array[28] ^ mac_array[26] ^ mac_array[21] ^
                        mac_array[19] ^ mac_array[17] ^ mac_array[16] ^
                        mac_array[14] ^ mac_array[12] ^ mac_array[10] ^
                        mac_array[6] ^ mac_array[5] ^ mac_array[4];

                crc[7] = mac_array[47] ^ mac_array[44] ^ mac_array[42] ^
                        mac_array[39] ^ mac_array[38] ^ mac_array[34] ^
                        mac_array[33] ^ mac_array[30] ^ mac_array[29] ^
                        mac_array[27] ^ mac_array[22] ^ mac_array[20] ^
                        mac_array[18] ^ mac_array[17] ^ mac_array[15] ^
                        mac_array[13] ^ mac_array[11] ^ mac_array[7] ^
                        mac_array[6] ^ mac_array[5];

                for (i = 0; i < 8; i++)
                        crc_result = crc_result | (crc[i] << i);

                eth_port_omc_addr (eth_port_num, crc_result, queue, option);
        }
        return;
}

/*******************************************************************************
* eth_port_smc_addr - Special Multicast address settings.
*
* DESCRIPTION:
*       This routine controls the MV device special MAC multicast support.
*       The Special Multicast Table for MAC addresses supports MAC of the form
*       0x01-00-5E-00-00-XX (where XX is between 0x00 and 0x_fF).
*       The MAC DA[7:0] bits are used as a pointer to the Special Multicast
*       Table entries in the DA-Filter table.
*       This function set the Special Multicast Table appropriate entry
*       according to the argument given.
*
* INPUT:
*       ETH_PORT        eth_port_num      Port number.
*       unsigned char   mc_byte         Multicast addr last byte (MAC DA[7:0] bits).
*       ETH_QUEUE                queue          Rx queue number for this MAC address.
*       int                     option      0 = Add, 1 = remove address.
*
* OUTPUT:
*       See description.
*
* RETURN:
*       true is output succeeded.
*       false if option parameter is invalid.
*
*******************************************************************************/
static bool eth_port_smc_addr (ETH_PORT eth_port_num,
                               unsigned char mc_byte,
                               ETH_QUEUE queue, int option)
{
        unsigned int smc_table_reg;
        unsigned int tbl_offset;
        unsigned int reg_offset;

        /* Locate the SMC table entry */
        tbl_offset = (mc_byte / 4) * 4; /* Register offset from SMC table base */
        reg_offset = mc_byte % 4;       /* Entry offset within the above register */
        queue &= 0x7;

        switch (option) {
        case REJECT_MAC_ADDR:
                /* Clear accepts frame bit at specified Special DA table entry */
                smc_table_reg =
                        MV_REG_READ ((MV64460_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset));
                smc_table_reg &= (0x0E << (8 * reg_offset));

                MV_REG_WRITE ((MV64460_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset), smc_table_reg);
                break;

        case ACCEPT_MAC_ADDR:
                /* Set accepts frame bit at specified Special DA table entry */
                smc_table_reg =
                        MV_REG_READ ((MV64460_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset));
                smc_table_reg |= ((0x01 | queue) << (8 * reg_offset));

                MV_REG_WRITE ((MV64460_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset), smc_table_reg);
                break;

        default:
                return false;
        }
        return true;
}

/*******************************************************************************
* eth_port_omc_addr - Multicast address settings.
*
* DESCRIPTION:
*       This routine controls the MV device Other MAC multicast support.
*       The Other Multicast Table is used for multicast of another type.
*       A CRC-8bit is used as an index to the Other Multicast Table entries
*       in the DA-Filter table.
*       The function gets the CRC-8bit value from the calling routine and
*      set the Other Multicast Table appropriate entry according to the
*       CRC-8 argument given.
*
* INPUT:
*       ETH_PORT        eth_port_num      Port number.
*       unsigned char     crc8          A CRC-8bit (Polynomial: x^8+x^2+x^1+1).
*       ETH_QUEUE                queue          Rx queue number for this MAC address.
*       int                     option      0 = Add, 1 = remove address.
*
* OUTPUT:
*       See description.
*
* RETURN:
*       true is output succeeded.
*       false if option parameter is invalid.
*
*******************************************************************************/
static bool eth_port_omc_addr (ETH_PORT eth_port_num,
                               unsigned char crc8,
                               ETH_QUEUE queue, int option)
{
        unsigned int omc_table_reg;
        unsigned int tbl_offset;
        unsigned int reg_offset;

        /* Locate the OMC table entry */
        tbl_offset = (crc8 / 4) * 4;    /* Register offset from OMC table base */
        reg_offset = crc8 % 4;  /* Entry offset within the above register */
        queue &= 0x7;

        switch (option) {
        case REJECT_MAC_ADDR:
                /* Clear accepts frame bit at specified Other DA table entry */
                omc_table_reg =
                        MV_REG_READ ((MV64460_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset));
                omc_table_reg &= (0x0E << (8 * reg_offset));

                MV_REG_WRITE ((MV64460_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset), omc_table_reg);
                break;

        case ACCEPT_MAC_ADDR:
                /* Set accepts frame bit at specified Other DA table entry */
                omc_table_reg =
                        MV_REG_READ ((MV64460_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset));

                omc_table_reg |= ((0x01 | queue) << (8 * reg_offset));

                MV_REG_WRITE ((MV64460_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE (eth_port_num) + tbl_offset), omc_table_reg);
                break;

        default:
                return false;
        }
        return true;
}
#endif

/*******************************************************************************
* 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:
*       ETH_PORT    eth_port_num   Ethernet Port number. See ETH_PORT enum.
*
* OUTPUT:
*       Multicast and Unicast packets are rejected.
*
* RETURN:
*       None.
*
*******************************************************************************/
static void eth_port_init_mac_tables (ETH_PORT eth_port_num)
{
        int table_index;

        /* Clear DA filter unicast table (Ex_dFUT) */
        for (table_index = 0; table_index <= 0xC; table_index += 4)
                MV_REG_WRITE ((MV64460_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_REG_WRITE ((MV64460_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE (eth_port_num) + table_index), 0);
                /* Clear DA filter other multicast table (Ex_dFOMT) */
                MV_REG_WRITE ((MV64460_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:
*       ETH_PORT    eth_port_num   Ethernet Port number. See ETH_PORT enum.
*
* OUTPUT:
*       After reading all MIB counters, the counters resets.
*
* RETURN:
*       MIB counter value.
*
*******************************************************************************/
static void eth_clear_mib_counters (ETH_PORT eth_port_num)
{
        int i;
        unsigned int dummy;

        /* Perform dummy reads from MIB counters */
        for (i = ETH_MIB_GOOD_OCTETS_RECEIVED_LOW; i < ETH_MIB_LATE_COLLISION;
             i += 4)
                dummy = MV_REG_READ ((MV64460_ETH_MIB_COUNTERS_BASE
                                      (eth_port_num) + i));

        return;
}

/*******************************************************************************
* eth_read_mib_counter - Read a MIB counter
*
* DESCRIPTION:
*       This function reads a MIB counter of a specific ethernet port.
*       NOTE - If read from ETH_MIB_GOOD_OCTETS_RECEIVED_LOW, then the
*       following read must be from ETH_MIB_GOOD_OCTETS_RECEIVED_HIGH
*       register. The same applies for ETH_MIB_GOOD_OCTETS_SENT_LOW and
*       ETH_MIB_GOOD_OCTETS_SENT_HIGH
*
* INPUT:
*       ETH_PORT    eth_port_num   Ethernet Port number. See ETH_PORT enum.
*       unsigned int mib_offset   MIB counter offset (use ETH_MIB_... macros).
*
* OUTPUT:
*       After reading the MIB counter, the counter resets.
*
* RETURN:
*       MIB counter value.
*
*******************************************************************************/
unsigned int eth_read_mib_counter (ETH_PORT eth_port_num,
                                   unsigned int mib_offset)
{
        return (MV_REG_READ (MV64460_ETH_MIB_COUNTERS_BASE (eth_port_num)
                             + mib_offset));
}

/*******************************************************************************
* ethernet_phy_set - Set the ethernet port PHY address.
*
* DESCRIPTION:
*       This routine set the ethernet port PHY address according to given
*       parameter.
*
* INPUT:
*               ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
*
* OUTPUT:
*       Set PHY Address Register with given PHY address parameter.
*
* RETURN:
*       None.
*
*******************************************************************************/
static void ethernet_phy_set (ETH_PORT eth_port_num, int phy_addr)
{
        unsigned int reg_data;

        reg_data = MV_REG_READ (MV64460_ETH_PHY_ADDR_REG);

        reg_data &= ~(0x1F << (5 * eth_port_num));
        reg_data |= (phy_addr << (5 * eth_port_num));

        MV_REG_WRITE (MV64460_ETH_PHY_ADDR_REG, reg_data);

        return;
}

/*******************************************************************************
 * ethernet_phy_get - Get the ethernet port PHY address.
 *
 * DESCRIPTION:
 *       This routine returns the given ethernet port PHY address.
 *
 * INPUT:
 *              ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *
 * OUTPUT:
 *       None.
 *
 * RETURN:
 *       PHY address.
 *
 *******************************************************************************/
static int ethernet_phy_get (ETH_PORT eth_port_num)
{
        unsigned int reg_data;

        reg_data = MV_REG_READ (MV64460_ETH_PHY_ADDR_REG);

        return ((reg_data >> (5 * eth_port_num)) & 0x1f);
}

/*******************************************************************************
 * ethernet_phy_reset - Reset Ethernet port PHY.
 *
 * DESCRIPTION:
 *       This routine utilize the SMI interface to reset the ethernet port PHY.
 *       The routine waits until the link is up again or link up is timeout.
 *
 * INPUT:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *
 * OUTPUT:
 *       The ethernet port PHY renew its link.
 *
 * RETURN:
 *       None.
 *
*******************************************************************************/
static bool ethernet_phy_reset (ETH_PORT eth_port_num)
{
        unsigned int time_out = 50;
        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);

        /* Poll on the PHY LINK */
        do {
                eth_port_read_smi_reg (eth_port_num, 1, &phy_reg_data);

                if (time_out-- == 0)
                        return false;
        }
        while (!(phy_reg_data & 0x20));

        return true;
}

/*******************************************************************************
 * 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:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *
 * OUTPUT:
 *       Channel activity is halted.
 *
 * RETURN:
 *       None.
 *
 *******************************************************************************/
static void eth_port_reset (ETH_PORT eth_port_num)
{
        unsigned int reg_data;

        /* Stop Tx port activity. Check port Tx activity. */
        reg_data =
                MV_REG_READ (MV64460_ETH_TRANSMIT_QUEUE_COMMAND_REG
                             (eth_port_num));

        if (reg_data & 0xFF) {
                /* Issue stop command for active channels only */
                MV_REG_WRITE (MV64460_ETH_TRANSMIT_QUEUE_COMMAND_REG
                              (eth_port_num), (reg_data << 8));

                /* Wait for all Tx activity to terminate. */
                do {
                        /* Check port cause register that all Tx queues are stopped */
                        reg_data =
                                MV_REG_READ
                                (MV64460_ETH_TRANSMIT_QUEUE_COMMAND_REG
                                 (eth_port_num));
                }
                while (reg_data & 0xFF);
        }

        /* Stop Rx port activity. Check port Rx activity. */
        reg_data =
                MV_REG_READ (MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG
                             (eth_port_num));

        if (reg_data & 0xFF) {
                /* Issue stop command for active channels only */
                MV_REG_WRITE (MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG
                              (eth_port_num), (reg_data << 8));

                /* Wait for all Rx activity to terminate. */
                do {
                        /* Check port cause register that all Rx queues are stopped */
                        reg_data =
                                MV_REG_READ
                                (MV64460_ETH_RECEIVE_QUEUE_COMMAND_REG
                                 (eth_port_num));
                }
                while (reg_data & 0xFF);
        }


        /* Clear all MIB counters */
        eth_clear_mib_counters (eth_port_num);

        /* Reset the Enable bit in the Configuration Register */
        reg_data =
                MV_REG_READ (MV64460_ETH_PORT_SERIAL_CONTROL_REG
                             (eth_port_num));
        reg_data &= ~ETH_SERIAL_PORT_ENABLE;
        MV_REG_WRITE (MV64460_ETH_PORT_SERIAL_CONTROL_REG (eth_port_num),
                      reg_data);

        return;
}

#if 0                           /* Not needed here */
/*******************************************************************************
 * ethernet_set_config_reg - Set specified bits in configuration register.
 *
 * DESCRIPTION:
 *       This function sets specified bits in the given ethernet
 *       configuration register.
 *
 * INPUT:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *      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 (ETH_PORT eth_port_num,
                                     unsigned int value)
{
        unsigned int eth_config_reg;

        eth_config_reg =
                MV_REG_READ (MV64460_ETH_PORT_CONFIG_REG (eth_port_num));
        eth_config_reg |= value;
        MV_REG_WRITE (MV64460_ETH_PORT_CONFIG_REG (eth_port_num),
                      eth_config_reg);

        return;
}
#endif

#if 0                           /* FIXME */
/*******************************************************************************
 * ethernet_reset_config_reg - Reset specified bits in configuration register.
 *
 * DESCRIPTION:
 *       This function resets specified bits in the given Ethernet
 *       configuration register.
 *
 * INPUT:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *      unsigned int    value   32 bit value.
 *
 * OUTPUT:
 *      The set bits in the value parameter are reset in the configuration
 *      register.
 *
 * RETURN:
 *      None.
 *
 *******************************************************************************/
static void ethernet_reset_config_reg (ETH_PORT eth_port_num,
                                       unsigned int value)
{
        unsigned int eth_config_reg;

        eth_config_reg = MV_REG_READ (MV64460_ETH_PORT_CONFIG_EXTEND_REG
                                      (eth_port_num));
        eth_config_reg &= ~value;
        MV_REG_WRITE (MV64460_ETH_PORT_CONFIG_EXTEND_REG (eth_port_num),
                      eth_config_reg);

        return;
}
#endif

#if 0                           /* Not needed here */
/*******************************************************************************
 * ethernet_get_config_reg - Get the port configuration register
 *
 * DESCRIPTION:
 *       This function returns the configuration register value of the given
 *       ethernet port.
 *
 * INPUT:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *
 * OUTPUT:
 *       None.
 *
 * RETURN:
 *       Port configuration register value.
 *
 *******************************************************************************/
static unsigned int ethernet_get_config_reg (ETH_PORT eth_port_num)
{
        unsigned int eth_config_reg;

        eth_config_reg = MV_REG_READ (MV64460_ETH_PORT_CONFIG_EXTEND_REG
                                      (eth_port_num));
        return eth_config_reg;
}

#endif

/*******************************************************************************
 * 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:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *       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 bool eth_port_read_smi_reg (ETH_PORT eth_port_num,
                                   unsigned int phy_reg, unsigned int *value)
{
        unsigned int reg_value;
        unsigned int time_out = PHY_BUSY_TIMEOUT;
        int phy_addr;

        phy_addr = ethernet_phy_get (eth_port_num);
/*    printf("     Phy-Port %d has addess %d  \n",eth_port_num, phy_addr );*/

        /* first check that it is not busy */
        do {
                reg_value = MV_REG_READ (MV64460_ETH_SMI_REG);
                if (time_out-- == 0) {
                        return false;
                }
        }
        while (reg_value & ETH_SMI_BUSY);

        /* not busy */

        MV_REG_WRITE (MV64460_ETH_SMI_REG,
                      (phy_addr << 16) | (phy_reg << 21) |
                      ETH_SMI_OPCODE_READ);

        time_out = PHY_BUSY_TIMEOUT;    /* initialize the time out var again */

        do {
                reg_value = MV_REG_READ (MV64460_ETH_SMI_REG);
                if (time_out-- == 0) {
                        return false;
                }
        }
        while ((reg_value & ETH_SMI_READ_VALID) != ETH_SMI_READ_VALID); /* Bit set equ operation done */

        /* Wait for the data to update in the SMI register */
#define PHY_UPDATE_TIMEOUT      10000
        for (time_out = 0; time_out < PHY_UPDATE_TIMEOUT; time_out++);

        reg_value = MV_REG_READ (MV64460_ETH_SMI_REG);

        *value = reg_value & 0xffff;

        return true;
}

/*******************************************************************************
 * 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:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *      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 bool eth_port_write_smi_reg (ETH_PORT eth_port_num,
                                    unsigned int phy_reg, unsigned int value)
{
        unsigned int reg_value;
        unsigned int time_out = PHY_BUSY_TIMEOUT;
        int phy_addr;

        phy_addr = ethernet_phy_get (eth_port_num);

        /* first check that it is not busy */
        do {
                reg_value = MV_REG_READ (MV64460_ETH_SMI_REG);
                if (time_out-- == 0) {
                        return false;
                }
        }
        while (reg_value & ETH_SMI_BUSY);

        /* not busy */
        MV_REG_WRITE (MV64460_ETH_SMI_REG,
                      (phy_addr << 16) | (phy_reg << 21) |
                      ETH_SMI_OPCODE_WRITE | (value & 0xffff));
        return true;
}

/*******************************************************************************
 * eth_set_access_control - Config address decode parameters for Ethernet unit
 *
 * DESCRIPTION:
 *       This function configures the address decode parameters for the Gigabit
 *       Ethernet Controller according the given parameters struct.
 *
 * INPUT:
 *      ETH_PORT   eth_port_num   Ethernet Port number. See ETH_PORT enum.
 *       ETH_WIN_PARAM  *param   Address decode parameter struct.
 *
 * OUTPUT:
 *       An access window is opened using the given access parameters.
 *
 * RETURN:
 *       None.
 *
 *******************************************************************************/
static void eth_set_access_control (ETH_PORT eth_port_num,
                                    ETH_WIN_PARAM * param)
{
        unsigned int access_prot_reg;

        /* Set access control register */
        access_prot_reg = MV_REG_READ (MV64460_ETH_ACCESS_PROTECTION_REG
                                       (eth_port_num));
        access_prot_reg &= (~(3 << (param->win * 2)));  /* clear window permission */
        access_prot_reg |= (param->access_ctrl << (param->win * 2));
        MV_REG_WRITE (MV64460_ETH_ACCESS_PROTECTION_REG (eth_port_num),
                      access_prot_reg);

        /* Set window Size reg (SR) */
        MV_REG_WRITE ((MV64460_ETH_SIZE_REG_0 +
                       (ETH_SIZE_REG_GAP * param->win)),
                      (((param->size / 0x10000) - 1) << 16));

        /* Set window Base address reg (BA) */
        MV_REG_WRITE ((MV64460_ETH_BAR_0 + (ETH_BAR_GAP * param->win)),
                      (param->target | param->attributes | param->base_addr));
        /* High address remap reg (HARR) */
        if (param->win < 4)
                MV_REG_WRITE ((MV64460_ETH_HIGH_ADDR_REMAP_REG_0 +
                               (ETH_HIGH_ADDR_REMAP_REG_GAP * param->win)),
                              param->high_addr);

        /* Base address enable reg (BARER) */
        if (param->enable == 1)
                MV_RESET_REG_BITS (MV64460_ETH_BASE_ADDR_ENABLE_REG,
                                   (1 << param->win));
        else
                MV_SET_REG_BITS (MV64460_ETH_BASE_ADDR_ENABLE_REG,
                                 (1 << param->win));
}

/*******************************************************************************
 * 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:
 *      ETH_PORT_INFO   *p_eth_port_ctrl   Ethernet Port Control srtuct.
 *      ETH_QUEUE       rx_queue         Number of Rx queue.
 *      int                     rx_desc_num       Number of Rx descriptors
 *      int                     rx_buff_size      Size of Rx buffer
 *      unsigned int    rx_desc_base_addr  Rx descriptors memory area base addr.
 *      unsigned int    rx_buff_base_addr  Rx buffer memory area base addr.
 *
 * OUTPUT:
 *      The routine updates the Ethernet port control struct with information
 *      regarding the Rx descriptors and buffers.
 *
 * RETURN:
 *      false if the given descriptors memory area is not aligned according to
 *      Ethernet SDMA specifications.
 *      true otherwise.
 *
 *******************************************************************************/
static bool ether_init_rx_desc_ring (ETH_PORT_INFO * p_eth_port_ctrl,
                                     ETH_QUEUE rx_queue,
                                     int rx_desc_num,
                                     int rx_buff_size,
                                     unsigned int rx_desc_base_addr,
                                     unsigned int rx_buff_base_addr)
{
        ETH_RX_DESC *p_rx_desc;
        ETH_RX_DESC *p_rx_prev_desc;    /* pointer to link with the last descriptor */
        unsigned int buffer_addr;
        int ix;                 /* a counter */


        p_rx_desc = (ETH_RX_DESC *) rx_desc_base_addr;
        p_rx_prev_desc = p_rx_desc;
        buffer_addr = rx_buff_base_addr;

        /* Rx desc Must be 4LW aligned (i.e. Descriptor_Address[3:0]=0000). */
        if (rx_buff_base_addr & 0xF)
                return false;

        /* Rx buffers are limited to 64K bytes and Minimum size is 8 bytes  */
        if ((rx_buff_size < 8) || (rx_buff_size > RX_BUFFER_MAX_SIZE))
                return false;

        /* Rx buffers must be 64-bit aligned.       */
        if ((rx_buff_base_addr + rx_buff_size) & 0x7)
                return false;

        /* initialize the Rx descriptors ring */
        for (ix = 0; ix < rx_desc_num; ix++) {
                p_rx_desc->buf_size = rx_buff_size;
                p_rx_desc->byte_cnt = 0x0000;
                p_rx_desc->cmd_sts =
                        ETH_BUFFER_OWNED_BY_DMA | ETH_RX_ENABLE_INTERRUPT;
                p_rx_desc->next_desc_ptr =
                        ((unsigned int) p_rx_desc) + RX_DESC_ALIGNED_SIZE;
                p_rx_desc->buf_ptr = buffer_addr;
                p_rx_desc->return_info = 0x00000000;
                D_CACHE_FLUSH_LINE (p_rx_desc, 0);
                buffer_addr += rx_buff_size;
                p_rx_prev_desc = p_rx_desc;
                p_rx_desc = (ETH_RX_DESC *)
                        ((unsigned int) p_rx_desc + RX_DESC_ALIGNED_SIZE);
        }

        /* Closing Rx descriptors ring */
        p_rx_prev_desc->next_desc_ptr = (rx_desc_base_addr);
        D_CACHE_FLUSH_LINE (p_rx_prev_desc, 0);

        /* Save Rx desc pointer to driver struct. */
        CURR_RFD_SET ((ETH_RX_DESC *) rx_desc_base_addr, rx_queue);
        USED_RFD_SET ((ETH_RX_DESC *) rx_desc_base_addr, rx_queue);

        p_eth_port_ctrl->p_rx_desc_area_base[rx_queue] =
                (ETH_RX_DESC *) rx_desc_base_addr;
        p_eth_port_ctrl->rx_desc_area_size[rx_queue] =
                rx_desc_num * RX_DESC_ALIGNED_SIZE;

        p_eth_port_ctrl->port_rx_queue_command |= (1 << rx_queue);

        return true;
}

/*******************************************************************************
 * 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:
 *      ETH_PORT_INFO   *p_eth_port_ctrl   Ethernet Port Control srtuct.
 *      ETH_QUEUE       tx_queue         Number of Tx queue.
 *      int                     tx_desc_num       Number of Tx descriptors
 *      int                     tx_buff_size      Size of Tx buffer
 *      unsigned int    tx_desc_base_addr  Tx descriptors memory area base addr.
 *      unsigned int    tx_buff_base_addr  Tx buffer memory area base addr.
 *
 * OUTPUT:
 *      The routine updates the Ethernet port control struct with information
 *      regarding the Tx descriptors and buffers.
 *
 * RETURN:
 *      false if the given descriptors memory area is not aligned according to
 *      Ethernet SDMA specifications.
 *      true otherwise.
 *
 *******************************************************************************/
static bool ether_init_tx_desc_ring (ETH_PORT_INFO * p_eth_port_ctrl,
                                     ETH_QUEUE tx_queue,
                                     int tx_desc_num,
                                     int tx_buff_size,
                                     unsigned int tx_desc_base_addr,
                                     unsigned int tx_buff_base_addr)
{

        ETH_TX_DESC *p_tx_desc;
        ETH_TX_DESC *p_tx_prev_desc;
        unsigned int buffer_addr;
        int ix;                 /* a counter */


        /* save the first desc pointer to link with the last descriptor */
        p_tx_desc = (ETH_TX_DESC *) tx_desc_base_addr;
        p_tx_prev_desc = p_tx_desc;
        buffer_addr = tx_buff_base_addr;

        /* Tx desc Must be 4LW aligned (i.e. Descriptor_Address[3:0]=0000). */
        if (tx_buff_base_addr & 0xF)
                return false;

        /* Tx buffers are limited to 64K bytes and Minimum size is 8 bytes  */
        if ((tx_buff_size > TX_BUFFER_MAX_SIZE)
            || (tx_buff_size < TX_BUFFER_MIN_SIZE))
                return false;

        /* Initialize the Tx descriptors ring */
        for (ix = 0; ix < tx_desc_num; ix++) {
                p_tx_desc->byte_cnt = 0x0000;
                p_tx_desc->l4i_chk = 0x0000;
                p_tx_desc->cmd_sts = 0x00000000;
                p_tx_desc->next_desc_ptr =
                        ((unsigned int) p_tx_desc) + TX_DESC_ALIGNED_SIZE;

                p_tx_desc->buf_ptr = buffer_addr;
                p_tx_desc->return_info = 0x00000000;
                D_CACHE_FLUSH_LINE (p_tx_desc, 0);
                buffer_addr += tx_buff_size;
                p_tx_prev_desc = p_tx_desc;
                p_tx_desc = (ETH_TX_DESC *)
                        ((unsigned int) p_tx_desc + TX_DESC_ALIGNED_SIZE);

        }
        /* Closing Tx descriptors ring */
        p_tx_prev_desc->next_desc_ptr = tx_desc_base_addr;
        D_CACHE_FLUSH_LINE (p_tx_prev_desc, 0);
        /* Set Tx desc pointer in driver struct. */
        CURR_TFD_SET ((ETH_TX_DESC *) tx_desc_base_addr, tx_queue);
        USED_TFD_SET ((ETH_TX_DESC *) tx_desc_base_addr, tx_queue);

        /* Init Tx ring base and size parameters */
        p_eth_port_ctrl->p_tx_desc_area_base[tx_queue] =
                (ETH_TX_DESC *) tx_desc_base_addr;
        p_eth_port_ctrl->tx_desc_area_size[tx_queue] =
                (tx_desc_num * TX_DESC_ALIGNED_SIZE);

        /* Add the queue to the list of Tx queues of this port */
        p_eth_port_ctrl->port_tx_queue_command |= (1 << tx_queue);

        return true;
}

/*******************************************************************************
 * 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:
 *      ETH_PORT_INFO   *p_eth_port_ctrl   Ethernet Port Control srtuct.
 *      ETH_QUEUE       tx_queue         Number of Tx queue.
 *      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.
 *
 *******************************************************************************/
static ETH_FUNC_RET_STATUS eth_port_send (ETH_PORT_INFO * p_eth_port_ctrl,
                                          ETH_QUEUE tx_queue,
                                          PKT_INFO * p_pkt_info)
{
        volatile ETH_TX_DESC *p_tx_desc_first;
        volatile ETH_TX_DESC *p_tx_desc_curr;
        volatile ETH_TX_DESC *p_tx_next_desc_curr;
        volatile ETH_TX_DESC *p_tx_desc_used;
        unsigned int command_status;

        /* Do not process Tx ring in case of Tx ring resource error */
        if (p_eth_port_ctrl->tx_resource_err[tx_queue] == true)
                return ETH_QUEUE_FULL;

        /* Get the Tx Desc ring indexes */
        CURR_TFD_GET (p_tx_desc_curr, tx_queue);
        USED_TFD_GET (p_tx_desc_used, tx_queue);

        if (p_tx_desc_curr == NULL)
                return ETH_ERROR;

        /* The following parameters are used to save readings from memory */
        p_tx_next_desc_curr = TX_NEXT_DESC_PTR (p_tx_desc_curr, tx_queue);
        command_status = p_pkt_info->cmd_sts | ETH_ZERO_PADDING | ETH_GEN_CRC;

        if (command_status & (ETH_TX_FIRST_DESC)) {
                /* Update first desc */
                FIRST_TFD_SET (p_tx_desc_curr, tx_queue);
                p_tx_desc_first = p_tx_desc_curr;
        } else {
                FIRST_TFD_GET (p_tx_desc_first, tx_queue);
                command_status |= ETH_BUFFER_OWNED_BY_DMA;
        }

        /* Buffers with a payload smaller than 8 bytes must be aligned to 64-bit */
        /* boundary. We use the memory allocated for Tx descriptor. This memory  */
        /* located in TX_BUF_OFFSET_IN_DESC offset within the Tx descriptor. */
        if (p_pkt_info->byte_cnt <= 8) {
                printf ("You have failed in the < 8 bytes errata - fixme\n");   /* RABEEH - TBD */
                return ETH_ERROR;

                p_tx_desc_curr->buf_ptr =
                        (unsigned int) p_tx_desc_curr + TX_BUF_OFFSET_IN_DESC;
                eth_b_copy (p_pkt_info->buf_ptr, p_tx_desc_curr->buf_ptr,
                            p_pkt_info->byte_cnt);
        } else
                p_tx_desc_curr->buf_ptr = p_pkt_info->buf_ptr;

        p_tx_desc_curr->byte_cnt = p_pkt_info->byte_cnt;
        p_tx_desc_curr->return_info = p_pkt_info->return_info;

        if (p_pkt_info->cmd_sts & (ETH_TX_LAST_DESC)) {
                /* Set last desc with DMA ownership and interrupt enable. */
                p_tx_desc_curr->cmd_sts = command_status |
                        ETH_BUFFER_OWNED_BY_DMA | ETH_TX_ENABLE_INTERRUPT;

                if (p_tx_desc_curr != p_tx_desc_first)
                        p_tx_desc_first->cmd_sts |= ETH_BUFFER_OWNED_BY_DMA;

                /* Flush CPU pipe */

                D_CACHE_FLUSH_LINE ((unsigned int) p_tx_desc_curr, 0);
                D_CACHE_FLUSH_LINE ((unsigned int) p_tx_desc_first, 0);
                CPU_PIPE_FLUSH;

                /* Apply send command */
                ETH_ENABLE_TX_QUEUE (tx_queue, p_eth_port_ctrl->port_num);

                /* Finish Tx packet. Update first desc in case of Tx resource error */
                p_tx_desc_first = p_tx_next_desc_curr;
                FIRST_TFD_SET (p_tx_desc_first, tx_queue);

        } else {
                p_tx_desc_curr->cmd_sts = command_status;
                D_CACHE_FLUSH_LINE ((unsigned int) p_tx_desc_curr, 0);
        }

        /* Check for ring index overlap in the Tx desc ring */
        if (p_tx_next_desc_curr == p_tx_desc_used) {
                /* Update the current descriptor */
                CURR_TFD_SET (p_tx_desc_first, tx_queue);

                p_eth_port_ctrl->tx_resource_err[tx_queue] = true;
                return ETH_QUEUE_LAST_RESOURCE;
        } else {
                /* Update the current descriptor */
                CURR_TFD_SET (p_tx_next_desc_curr, tx_queue);
                return ETH_OK;
        }
}

/*******************************************************************************
 * 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:
 *      ETH_PORT_INFO   *p_eth_port_ctrl   Ethernet Port Control srtuct.
 *      ETH_QUEUE       tx_queue         Number of Tx queue.
 *      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 (ETH_PORT_INFO *
                                               p_eth_port_ctrl,
                                               ETH_QUEUE tx_queue,
                                               PKT_INFO * p_pkt_info)
{
        volatile ETH_TX_DESC *p_tx_desc_used = NULL;
        volatile ETH_TX_DESC *p_tx_desc_first = NULL;
        unsigned int command_status;


        /* Get the Tx Desc ring indexes */
        USED_TFD_GET (p_tx_desc_used, tx_queue);
        FIRST_TFD_GET (p_tx_desc_first, tx_queue);


        /* Sanity check */
        if (p_tx_desc_used == NULL)
                return ETH_ERROR;

        command_status = p_tx_desc_used->cmd_sts;

        /* Still transmitting... */
        if (command_status & (ETH_BUFFER_OWNED_BY_DMA)) {
                D_CACHE_FLUSH_LINE ((unsigned int) p_tx_desc_used, 0);
                return ETH_RETRY;
        }

        /* Stop release. About to overlap the current available Tx descriptor */
        if ((p_tx_desc_used == p_tx_desc_first) &&
            (p_eth_port_ctrl->tx_resource_err[tx_queue] == false)) {
                D_CACHE_FLUSH_LINE ((unsigned int) p_tx_desc_used, 0);
                return ETH_END_OF_JOB;
        }

        /* Pass the packet information to the caller */
        p_pkt_info->cmd_sts = command_status;
        p_pkt_info->return_info = p_tx_desc_used->return_info;
        p_tx_desc_used->return_info = 0;

        /* Update the next descriptor to release. */
        USED_TFD_SET (TX_NEXT_DESC_PTR (p_tx_desc_used, tx_queue), tx_queue);

        /* Any Tx return cancels the Tx resource error status */
        if (p_eth_port_ctrl->tx_resource_err[tx_queue] == true)
                p_eth_port_ctrl->tx_resource_err[tx_queue] = false;

        D_CACHE_FLUSH_LINE ((unsigned int) p_tx_desc_used, 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:
 *      ETH_PORT_INFO   *p_eth_port_ctrl   Ethernet Port Control srtuct.
 *      ETH_QUEUE       rx_queue         Number of Rx queue.
 *      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 (ETH_PORT_INFO * p_eth_port_ctrl,
                                             ETH_QUEUE rx_queue,
                                             PKT_INFO * p_pkt_info)
{
        volatile ETH_RX_DESC *p_rx_curr_desc;
        volatile ETH_RX_DESC *p_rx_next_curr_desc;
        volatile ETH_RX_DESC *p_rx_used_desc;
        unsigned int command_status;

        /* Do not process Rx ring in case of Rx ring resource error */
        if (p_eth_port_ctrl->rx_resource_err[rx_queue] == true) {
                printf ("\nRx Queue is full ...\n");
                return ETH_QUEUE_FULL;
        }

        /* Get the Rx Desc ring 'curr and 'used' indexes */
        CURR_RFD_GET (p_rx_curr_desc, rx_queue);
        USED_RFD_GET (p_rx_used_desc, rx_queue);

        /* Sanity check */
        if (p_rx_curr_desc == NULL)
                return ETH_ERROR;

        /* The following parameters are used to save readings from memory */
        p_rx_next_curr_desc = RX_NEXT_DESC_PTR (p_rx_curr_desc, rx_queue);
        command_status = p_rx_curr_desc->cmd_sts;

        /* Nothing to receive... */
        if (command_status & (ETH_BUFFER_OWNED_BY_DMA)) {
/*      DP(printf("Rx: command_status: %08x\n", command_status)); */
                D_CACHE_FLUSH_LINE ((unsigned int) p_rx_curr_desc, 0);
/*      DP(printf("\nETH_END_OF_JOB ...\n"));*/
                return ETH_END_OF_JOB;
        }

        p_pkt_info->byte_cnt = (p_rx_curr_desc->byte_cnt) - RX_BUF_OFFSET;
        p_pkt_info->cmd_sts = command_status;
        p_pkt_info->buf_ptr = (p_rx_curr_desc->buf_ptr) + RX_BUF_OFFSET;
        p_pkt_info->return_info = p_rx_curr_desc->return_info;
        p_pkt_info->l4i_chk = p_rx_curr_desc->buf_size; /* IP fragment indicator */

        /* Clean the return info field to indicate that the packet has been */
        /* moved to the upper layers                                        */
        p_rx_curr_desc->return_info = 0;

        /* Update 'curr' in data structure */
        CURR_RFD_SET (p_rx_next_curr_desc, rx_queue);

        /* Rx descriptors resource exhausted. Set the Rx ring resource error flag */
        if (p_rx_next_curr_desc == p_rx_used_desc)
                p_eth_port_ctrl->rx_resource_err[rx_queue] = true;

        D_CACHE_FLUSH_LINE ((unsigned int) p_rx_curr_desc, 0);
        CPU_PIPE_FLUSH;
        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:
 *      ETH_PORT_INFO   *p_eth_port_ctrl   Ethernet Port Control srtuct.
 *      ETH_QUEUE       rx_queue         Number of Rx queue.
 *      PKT_INFO        *p_pkt_info       Information on the 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 (ETH_PORT_INFO *
                                               p_eth_port_ctrl,
                                               ETH_QUEUE rx_queue,
                                               PKT_INFO * p_pkt_info)
{
        volatile ETH_RX_DESC *p_used_rx_desc;   /* Where to return Rx resource */

        /* Get 'used' Rx descriptor */
        USED_RFD_GET (p_used_rx_desc, rx_queue);

        /* Sanity check */
        if (p_used_rx_desc == NULL)
                return ETH_ERROR;

        p_used_rx_desc->buf_ptr = p_pkt_info->buf_ptr;
        p_used_rx_desc->return_info = p_pkt_info->return_info;
        p_used_rx_desc->byte_cnt = p_pkt_info->byte_cnt;
        p_used_rx_desc->buf_size = MV64460_RX_BUFFER_SIZE;      /* Reset Buffer size */

        /* Flush the write pipe */
        CPU_PIPE_FLUSH;

        /* Return the descriptor to DMA ownership */
        p_used_rx_desc->cmd_sts =
                ETH_BUFFER_OWNED_BY_DMA | ETH_RX_ENABLE_INTERRUPT;

        /* Flush descriptor and CPU pipe */
        D_CACHE_FLUSH_LINE ((unsigned int) p_used_rx_desc, 0);
        CPU_PIPE_FLUSH;

        /* Move the used descriptor pointer to the next descriptor */
        USED_RFD_SET (RX_NEXT_DESC_PTR (p_used_rx_desc, rx_queue), rx_queue);

        /* Any Rx return cancels the Rx resource error status */
        if (p_eth_port_ctrl->rx_resource_err[rx_queue] == true)
                p_eth_port_ctrl->rx_resource_err[rx_queue] = false;

        return ETH_OK;
}

/*******************************************************************************
 * 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:
 *      ETH_PORT 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.
 *
 *******************************************************************************/
#if 0                           /* FIXME */
static unsigned int eth_port_set_rx_coal (ETH_PORT eth_port_num,
                                          unsigned int t_clk,
                                          unsigned int delay)
{
        unsigned int coal;

        coal = ((t_clk / 1000000) * delay) / 64;
        /* Set RX Coalescing mechanism */
        MV_REG_WRITE (MV64460_ETH_SDMA_CONFIG_REG (eth_port_num),
                      ((coal & 0x3fff) << 8) |
                      (MV_REG_READ
                       (MV64460_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:
 *      ETH_PORT 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.
 *
 *******************************************************************************/
#if 0                           /* FIXME */
static unsigned int eth_port_set_tx_coal (ETH_PORT eth_port_num,
                                          unsigned int t_clk,
                                          unsigned int delay)
{
        unsigned int coal;

        coal = ((t_clk / 1000000) * delay) / 64;
        /* Set TX Coalescing mechanism */
        MV_REG_WRITE (MV64460_ETH_TX_FIFO_URGENT_THRESHOLD_REG (eth_port_num),
                      coal << 4);
        return coal;
}
#endif

/*******************************************************************************
 * eth_b_copy - Copy bytes from source to destination
 *
 * DESCRIPTION:
 *       This function supports the eight bytes limitation on Tx buffer size.
 *       The routine will zero eight bytes starting from the destination address
 *       followed by copying bytes from the source address to the destination.
 *
 * INPUT:
 *       unsigned int src_addr    32 bit source address.
 *       unsigned int dst_addr    32 bit destination address.
 *       int        byte_count    Number of bytes to copy.
 *
 * OUTPUT:
 *       See description.
 *
 * RETURN:
 *       None.
 *
 *******************************************************************************/
static void eth_b_copy (unsigned int src_addr, unsigned int dst_addr,
                        int byte_count)
{
        /* Zero the dst_addr area */
        *(unsigned int *) dst_addr = 0x0;

        while (byte_count != 0) {
                *(char *) dst_addr = *(char *) src_addr;
                dst_addr++;
                src_addr++;
                byte_count--;
        }
}