/*
 * (C) Copyright 2003-2010
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * This file is based on mpc4200fec.c,
 * (C) Copyright Motorola, Inc., 2000
 */

#include <common.h>
#include <mpc5xxx.h>
#include <mpc5xxx_sdma.h>
#include <malloc.h>
#include <net.h>
#include <netdev.h>
#include <miiphy.h>
#include "mpc5xxx_fec.h"

DECLARE_GLOBAL_DATA_PTR;

/* #define DEBUG        0x28 */

#if !(defined(CONFIG_MII) || defined(CONFIG_CMD_MII))
#error "CONFIG_MII has to be defined!"
#endif

#if (DEBUG & 0x60)
static void tfifo_print(char *devname, mpc5xxx_fec_priv *fec);
static void rfifo_print(char *devname, mpc5xxx_fec_priv *fec);
#endif /* DEBUG */

typedef struct {
    uint8 data[1500];           /* actual data */
    int length;                 /* actual length */
    int used;                   /* buffer in use or not */
    uint8 head[16];             /* MAC header(6 + 6 + 2) + 2(aligned) */
} NBUF;

int fec5xxx_miiphy_read(const char *devname, uint8 phyAddr, uint8 regAddr, uint16 *retVal);
int fec5xxx_miiphy_write(const char *devname, uint8 phyAddr, uint8 regAddr, uint16 data);

static int mpc5xxx_fec_init_phy(struct eth_device *dev, bd_t * bis);

/********************************************************************/
#if (DEBUG & 0x2)
static void mpc5xxx_fec_phydump (char *devname)
{
        uint16 phyStatus, i;
        uint8 phyAddr = CONFIG_PHY_ADDR;
        uint8 reg_mask[] = {
#if CONFIG_PHY_TYPE == 0x79c874 /* AMD Am79C874 */
                /* regs to print: 0...7, 16...19, 21, 23, 24 */
                1, 1, 1, 1,  1, 1, 1, 1,     0, 0, 0, 0,  0, 0, 0, 0,
                1, 1, 1, 1,  0, 1, 0, 1,     1, 0, 0, 0,  0, 0, 0, 0,
#else
                /* regs to print: 0...8, 16...20 */
                1, 1, 1, 1,  1, 1, 1, 1,     1, 0, 0, 0,  0, 0, 0, 0,
                1, 1, 1, 1,  1, 0, 0, 0,     0, 0, 0, 0,  0, 0, 0, 0,
#endif
        };

        for (i = 0; i < 32; i++) {
                if (reg_mask[i]) {
                        miiphy_read(devname, phyAddr, i, &phyStatus);
                        printf("Mii reg %d: 0x%04x\n", i, phyStatus);
                }
        }
}
#endif

/********************************************************************/
static int mpc5xxx_fec_rbd_init(mpc5xxx_fec_priv *fec)
{
        int ix;
        char *data;
        static int once = 0;

        for (ix = 0; ix < FEC_RBD_NUM; ix++) {
                if (!once) {
                        data = (char *)malloc(FEC_MAX_PKT_SIZE);
                        if (data == NULL) {
                                printf ("RBD INIT FAILED\n");
                                return -1;
                        }
                        fec->rbdBase[ix].dataPointer = (uint32)data;
                }
                fec->rbdBase[ix].status = FEC_RBD_EMPTY;
                fec->rbdBase[ix].dataLength = 0;
        }
        once ++;

        /*
         * have the last RBD to close the ring
         */
        fec->rbdBase[ix - 1].status |= FEC_RBD_WRAP;
        fec->rbdIndex = 0;

        return 0;
}

/********************************************************************/
static void mpc5xxx_fec_tbd_init(mpc5xxx_fec_priv *fec)
{
        int ix;

        for (ix = 0; ix < FEC_TBD_NUM; ix++) {
                fec->tbdBase[ix].status = 0;
        }

        /*
         * Have the last TBD to close the ring
         */
        fec->tbdBase[ix - 1].status |= FEC_TBD_WRAP;

        /*
         * Initialize some indices
         */
        fec->tbdIndex = 0;
        fec->usedTbdIndex = 0;
        fec->cleanTbdNum = FEC_TBD_NUM;
}

/********************************************************************/
static void mpc5xxx_fec_rbd_clean(mpc5xxx_fec_priv *fec, volatile FEC_RBD * pRbd)
{
        /*
         * Reset buffer descriptor as empty
         */
        if ((fec->rbdIndex) == (FEC_RBD_NUM - 1))
                pRbd->status = (FEC_RBD_WRAP | FEC_RBD_EMPTY);
        else
                pRbd->status = FEC_RBD_EMPTY;

        pRbd->dataLength = 0;

        /*
         * Now, we have an empty RxBD, restart the SmartDMA receive task
         */
        SDMA_TASK_ENABLE(FEC_RECV_TASK_NO);

        /*
         * Increment BD count
         */
        fec->rbdIndex = (fec->rbdIndex + 1) % FEC_RBD_NUM;
}

/********************************************************************/
static void mpc5xxx_fec_tbd_scrub(mpc5xxx_fec_priv *fec)
{
        volatile FEC_TBD *pUsedTbd;

#if (DEBUG & 0x1)
        printf ("tbd_scrub: fec->cleanTbdNum = %d, fec->usedTbdIndex = %d\n",
                fec->cleanTbdNum, fec->usedTbdIndex);
#endif

        /*
         * process all the consumed TBDs
         */
        while (fec->cleanTbdNum < FEC_TBD_NUM) {
                pUsedTbd = &fec->tbdBase[fec->usedTbdIndex];
                if (pUsedTbd->status & FEC_TBD_READY) {
#if (DEBUG & 0x20)
                        printf("Cannot clean TBD %d, in use\n", fec->cleanTbdNum);
#endif
                        return;
                }

                /*
                 * clean this buffer descriptor
                 */
                if (fec->usedTbdIndex == (FEC_TBD_NUM - 1))
                        pUsedTbd->status = FEC_TBD_WRAP;
                else
                        pUsedTbd->status = 0;

                /*
                 * update some indeces for a correct handling of the TBD ring
                 */
                fec->cleanTbdNum++;
                fec->usedTbdIndex = (fec->usedTbdIndex + 1) % FEC_TBD_NUM;
        }
}

/********************************************************************/
static void mpc5xxx_fec_set_hwaddr(mpc5xxx_fec_priv *fec, char *mac)
{
        uint8 currByte;                 /* byte for which to compute the CRC */
        int byte;                       /* loop - counter */
        int bit;                        /* loop - counter */
        uint32 crc = 0xffffffff;        /* initial value */

        /*
         * The algorithm used is the following:
         * we loop on each of the six bytes of the provided address,
         * and we compute the CRC by left-shifting the previous
         * value by one position, so that each bit in the current
         * byte of the address may contribute the calculation. If
         * the latter and the MSB in the CRC are different, then
         * the CRC value so computed is also ex-ored with the
         * "polynomium generator". The current byte of the address
         * is also shifted right by one bit at each iteration.
         * This is because the CRC generatore in hardware is implemented
         * as a shift-register with as many ex-ores as the radixes
         * in the polynomium. This suggests that we represent the
         * polynomiumm itself as a 32-bit constant.
         */
        for (byte = 0; byte < 6; byte++) {
                currByte = mac[byte];
                for (bit = 0; bit < 8; bit++) {
                        if ((currByte & 0x01) ^ (crc & 0x01)) {
                                crc >>= 1;
                                crc = crc ^ 0xedb88320;
                        } else {
                                crc >>= 1;
                        }
                        currByte >>= 1;
                }
        }

        crc = crc >> 26;

        /*
         * Set individual hash table register
         */
        if (crc >= 32) {
                fec->eth->iaddr1 = (1 << (crc - 32));
                fec->eth->iaddr2 = 0;
        } else {
                fec->eth->iaddr1 = 0;
                fec->eth->iaddr2 = (1 << crc);
        }

        /*
         * Set physical address
         */
        fec->eth->paddr1 = (mac[0] << 24) + (mac[1] << 16) + (mac[2] << 8) + mac[3];
        fec->eth->paddr2 = (mac[4] << 24) + (mac[5] << 16) + 0x8808;
}

/********************************************************************/
static int mpc5xxx_fec_init(struct eth_device *dev, bd_t * bis)
{
        mpc5xxx_fec_priv *fec = (mpc5xxx_fec_priv *)dev->priv;
        struct mpc5xxx_sdma *sdma = (struct mpc5xxx_sdma *)MPC5XXX_SDMA;

#if (DEBUG & 0x1)
        printf ("mpc5xxx_fec_init... Begin\n");
#endif

        mpc5xxx_fec_init_phy(dev, bis);

        /*
         * Call board-specific PHY fixups (if any)
         */
#ifdef CONFIG_RESET_PHY_R
        reset_phy();
#endif

        /*
         * Initialize RxBD/TxBD rings
         */
        mpc5xxx_fec_rbd_init(fec);
        mpc5xxx_fec_tbd_init(fec);

        /*
         * Clear FEC-Lite interrupt event register(IEVENT)
         */
        fec->eth->ievent = 0xffffffff;

        /*
         * Set interrupt mask register
         */
        fec->eth->imask = 0x00000000;

        /*
         * Set FEC-Lite receive control register(R_CNTRL):
         */
        if (fec->xcv_type == SEVENWIRE) {
                /*
                 * Frame length=1518; 7-wire mode
                 */
                fec->eth->r_cntrl = 0x05ee0020; /*0x05ee0000;FIXME */
        } else {
                /*
                 * Frame length=1518; MII mode;
                 */
                fec->eth->r_cntrl = 0x05ee0024; /*0x05ee0004;FIXME */
        }

        fec->eth->x_cntrl = 0x00000000; /* half-duplex, heartbeat disabled */

        /*
         * Set Opcode/Pause Duration Register
         */
        fec->eth->op_pause = 0x00010020;        /*FIXME 0xffff0020; */

        /*
         * Set Rx FIFO alarm and granularity value
         */
        fec->eth->rfifo_cntrl = 0x0c000000
                                | (fec->eth->rfifo_cntrl & ~0x0f000000);
        fec->eth->rfifo_alarm = 0x0000030c;
#if (DEBUG & 0x22)
        if (fec->eth->rfifo_status & 0x00700000 ) {
                printf("mpc5xxx_fec_init() RFIFO error\n");
        }
#endif

        /*
         * Set Tx FIFO granularity value
         */
        fec->eth->tfifo_cntrl = 0x0c000000
                                | (fec->eth->tfifo_cntrl & ~0x0f000000);
#if (DEBUG & 0x2)
        printf("tfifo_status: 0x%08x\n", fec->eth->tfifo_status);
        printf("tfifo_alarm: 0x%08x\n", fec->eth->tfifo_alarm);
#endif

        /*
         * Set transmit fifo watermark register(X_WMRK), default = 64
         */
        fec->eth->tfifo_alarm = 0x00000080;
        fec->eth->x_wmrk = 0x2;

        /*
         * Set individual address filter for unicast address
         * and set physical address registers.
         */
        mpc5xxx_fec_set_hwaddr(fec, (char *)dev->enetaddr);

        /*
         * Set multicast address filter
         */
        fec->eth->gaddr1 = 0x00000000;
        fec->eth->gaddr2 = 0x00000000;

        /*
         * Turn ON cheater FSM: ????
         */
        fec->eth->xmit_fsm = 0x03000000;

        /*
         * Turn off COMM bus prefetch in the MPC5200 BestComm. It doesn't
         * work w/ the current receive task.
         */
         sdma->PtdCntrl |= 0x00000001;

        /*
         * Set priority of different initiators
         */
        sdma->IPR0 = 7;         /* always */
        sdma->IPR3 = 6;         /* Eth RX */
        sdma->IPR4 = 5;         /* Eth Tx */

        /*
         * Clear SmartDMA task interrupt pending bits
         */
        SDMA_CLEAR_IEVENT(FEC_RECV_TASK_NO);

        /*
         * Initialize SmartDMA parameters stored in SRAM
         */
        *(volatile int *)FEC_TBD_BASE = (int)fec->tbdBase;
        *(volatile int *)FEC_RBD_BASE = (int)fec->rbdBase;
        *(volatile int *)FEC_TBD_NEXT = (int)fec->tbdBase;
        *(volatile int *)FEC_RBD_NEXT = (int)fec->rbdBase;

        /*
         * Enable FEC-Lite controller
         */
        fec->eth->ecntrl |= 0x00000006;

#if (DEBUG & 0x2)
        if (fec->xcv_type != SEVENWIRE)
                mpc5xxx_fec_phydump (dev->name);
#endif

        /*
         * Enable SmartDMA receive task
         */
        SDMA_TASK_ENABLE(FEC_RECV_TASK_NO);

#if (DEBUG & 0x1)
        printf("mpc5xxx_fec_init... Done \n");
#endif

        return 1;
}

/********************************************************************/
static int mpc5xxx_fec_init_phy(struct eth_device *dev, bd_t * bis)
{
        mpc5xxx_fec_priv *fec = (mpc5xxx_fec_priv *)dev->priv;
        const uint8 phyAddr = CONFIG_PHY_ADDR;  /* Only one PHY */
        static int initialized = 0;

        if(initialized)
                return 0;
        initialized = 1;

#if (DEBUG & 0x1)
        printf ("mpc5xxx_fec_init_phy... Begin\n");
#endif

        /*
         * Initialize GPIO pins
         */
        if (fec->xcv_type == SEVENWIRE) {
                /*  10MBit with 7-wire operation */
#if defined(CONFIG_TOTAL5200)
                /* 7-wire and USB2 on Ethernet */
                *(vu_long *)MPC5XXX_GPS_PORT_CONFIG |= 0x00030000;
#else   /* !CONFIG_TOTAL5200 */
                /* 7-wire only */
                *(vu_long *)MPC5XXX_GPS_PORT_CONFIG |= 0x00020000;
#endif  /* CONFIG_TOTAL5200 */
        } else {
                /* 100MBit with MD operation */
                *(vu_long *)MPC5XXX_GPS_PORT_CONFIG |= 0x00050000;
        }

        /*
         * Clear FEC-Lite interrupt event register(IEVENT)
         */
        fec->eth->ievent = 0xffffffff;

        /*
         * Set interrupt mask register
         */
        fec->eth->imask = 0x00000000;

/*
 * In original Promess-provided code PHY initialization is disabled with the
 * following comment: "Phy initialization is DISABLED for now.  There was a
 * problem with running 100 Mbps on PRO board". Thus we temporarily disable
 * PHY initialization for the Motion-PRO board, until a proper fix is found.
 */

        if (fec->xcv_type != SEVENWIRE) {
                /*
                 * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
                 * and do not drop the Preamble.
                 * No MII for 7-wire mode
                 */
                fec->eth->mii_speed = (((gd->arch.ipb_clk >> 20) / 5) << 1);
        }

        if (fec->xcv_type != SEVENWIRE) {
                /*
                 * Initialize PHY(LXT971A):
                 *
                 *   Generally, on power up, the LXT971A reads its configuration
                 *   pins to check for forced operation, If not cofigured for
                 *   forced operation, it uses auto-negotiation/parallel detection
                 *   to automatically determine line operating conditions.
                 *   If the PHY device on the other side of the link supports
                 *   auto-negotiation, the LXT971A auto-negotiates with it
                 *   using Fast Link Pulse(FLP) Bursts. If the PHY partner does not
                 *   support auto-negotiation, the LXT971A automatically detects
                 *   the presence of either link pulses(10Mbps PHY) or Idle
                 *   symbols(100Mbps) and sets its operating conditions accordingly.
                 *
                 *   When auto-negotiation is controlled by software, the following
                 *   steps are recommended.
                 *
                 * Note:
                 *   The physical address is dependent on hardware configuration.
                 *
                 */
                int timeout = 1;
                uint16 phyStatus;

                /*
                 * Reset PHY, then delay 300ns
                 */
                miiphy_write(dev->name, phyAddr, 0x0, 0x8000);
                udelay(1000);

#if defined(CONFIG_UC101) || defined(CONFIG_MUCMC52)
                /* Set the LED configuration Register for the UC101
                   and MUCMC52 Board */
                miiphy_write(dev->name, phyAddr, 0x14, 0x4122);
#endif
                if (fec->xcv_type == MII10) {
                        /*
                         * Force 10Base-T, FDX operation
                         */
#if (DEBUG & 0x2)
                        printf("Forcing 10 Mbps ethernet link... ");
#endif
                        miiphy_read(dev->name, phyAddr, 0x1, &phyStatus);
                        /*
                        miiphy_write(dev->name, fec, phyAddr, 0x0, 0x0100);
                        */
                        miiphy_write(dev->name, phyAddr, 0x0, 0x0180);

                        timeout = 20;
                        do {    /* wait for link status to go down */
                                udelay(10000);
                                if ((timeout--) == 0) {
#if (DEBUG & 0x2)
                                        printf("hmmm, should not have waited...");
#endif
                                        break;
                                }
                                miiphy_read(dev->name, phyAddr, 0x1, &phyStatus);
#if (DEBUG & 0x2)
                                printf("=");
#endif
                        } while ((phyStatus & 0x0004)); /* !link up */

                        timeout = 1000;
                        do {    /* wait for link status to come back up */
                                udelay(10000);
                                if ((timeout--) == 0) {
                                        printf("failed. Link is down.\n");
                                        break;
                                }
                                miiphy_read(dev->name, phyAddr, 0x1, &phyStatus);
#if (DEBUG & 0x2)
                                printf("+");
#endif
                        } while (!(phyStatus & 0x0004));        /* !link up */

#if (DEBUG & 0x2)
                        printf ("done.\n");
#endif
                } else {        /* MII100 */
                        /*
                         * Set the auto-negotiation advertisement register bits
                         */
                        miiphy_write(dev->name, phyAddr, 0x4, 0x01e1);

                        /*
                         * Set MDIO bit 0.12 = 1(&& bit 0.9=1?) to enable auto-negotiation
                         */
                        miiphy_write(dev->name, phyAddr, 0x0, 0x1200);

                        /*
                         * Wait for AN completion
                         */
                        timeout = 5000;
                        do {
                                udelay(1000);

                                if ((timeout--) == 0) {
#if (DEBUG & 0x2)
                                        printf("PHY auto neg 0 failed...\n");
#endif
                                        return -1;
                                }

                                if (miiphy_read(dev->name, phyAddr, 0x1, &phyStatus) != 0) {
#if (DEBUG & 0x2)
                                        printf("PHY auto neg 1 failed 0x%04x...\n", phyStatus);
#endif
                                        return -1;
                                }
                        } while (!(phyStatus & 0x0004));

#if (DEBUG & 0x2)
                        printf("PHY auto neg complete! \n");
#endif
                }

        }

#if (DEBUG & 0x2)
        if (fec->xcv_type != SEVENWIRE)
                mpc5xxx_fec_phydump (dev->name);
#endif


#if (DEBUG & 0x1)
        printf("mpc5xxx_fec_init_phy... Done \n");
#endif

        return 1;
}

/********************************************************************/
static void mpc5xxx_fec_halt(struct eth_device *dev)
{
        struct mpc5xxx_sdma *sdma = (struct mpc5xxx_sdma *)MPC5XXX_SDMA;
        mpc5xxx_fec_priv *fec = (mpc5xxx_fec_priv *)dev->priv;
        int counter = 0xffff;

#if (DEBUG & 0x2)
        if (fec->xcv_type != SEVENWIRE)
                mpc5xxx_fec_phydump (dev->name);
#endif

        /*
         * mask FEC chip interrupts
         */
        fec->eth->imask = 0;

        /*
         * issue graceful stop command to the FEC transmitter if necessary
         */
        fec->eth->x_cntrl |= 0x00000001;

        /*
         * wait for graceful stop to register
         */
        while ((counter--) && (!(fec->eth->ievent & 0x10000000))) ;

        /*
         * Disable SmartDMA tasks
         */
        SDMA_TASK_DISABLE (FEC_XMIT_TASK_NO);
        SDMA_TASK_DISABLE (FEC_RECV_TASK_NO);

        /*
         * Turn on COMM bus prefetch in the MPC5200 BestComm after we're
         * done. It doesn't work w/ the current receive task.
         */
         sdma->PtdCntrl &= ~0x00000001;

        /*
         * Disable the Ethernet Controller
         */
        fec->eth->ecntrl &= 0xfffffffd;

        /*
         * Clear FIFO status registers
         */
        fec->eth->rfifo_status &= 0x00700000;
        fec->eth->tfifo_status &= 0x00700000;

        fec->eth->reset_cntrl = 0x01000000;

        /*
         * Issue a reset command to the FEC chip
         */
        fec->eth->ecntrl |= 0x1;

        /*
         * wait at least 16 clock cycles
         */
        udelay(10);

        /* don't leave the MII speed set to zero */
        if (fec->xcv_type != SEVENWIRE) {
                /*
                 * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
                 * and do not drop the Preamble.
                 * No MII for 7-wire mode
                 */
                fec->eth->mii_speed = (((gd->arch.ipb_clk >> 20) / 5) << 1);
        }

#if (DEBUG & 0x3)
        printf("Ethernet task stopped\n");
#endif
}

#if (DEBUG & 0x60)
/********************************************************************/

static void tfifo_print(char *devname, mpc5xxx_fec_priv *fec)
{
        uint16 phyAddr = CONFIG_PHY_ADDR;
        uint16 phyStatus;

        if ((fec->eth->tfifo_lrf_ptr != fec->eth->tfifo_lwf_ptr)
                || (fec->eth->tfifo_rdptr != fec->eth->tfifo_wrptr)) {

                miiphy_read(devname, phyAddr, 0x1, &phyStatus);
                printf("\nphyStatus: 0x%04x\n", phyStatus);
                printf("ecntrl:   0x%08x\n", fec->eth->ecntrl);
                printf("ievent:   0x%08x\n", fec->eth->ievent);
                printf("x_status: 0x%08x\n", fec->eth->x_status);
                printf("tfifo: status  0x%08x\n", fec->eth->tfifo_status);

                printf("       control 0x%08x\n", fec->eth->tfifo_cntrl);
                printf("       lrfp    0x%08x\n", fec->eth->tfifo_lrf_ptr);
                printf("       lwfp    0x%08x\n", fec->eth->tfifo_lwf_ptr);
                printf("       alarm   0x%08x\n", fec->eth->tfifo_alarm);
                printf("       readptr 0x%08x\n", fec->eth->tfifo_rdptr);
                printf("       writptr 0x%08x\n", fec->eth->tfifo_wrptr);
        }
}

static void rfifo_print(char *devname, mpc5xxx_fec_priv *fec)
{
        uint16 phyAddr = CONFIG_PHY_ADDR;
        uint16 phyStatus;

        if ((fec->eth->rfifo_lrf_ptr != fec->eth->rfifo_lwf_ptr)
                || (fec->eth->rfifo_rdptr != fec->eth->rfifo_wrptr)) {

                miiphy_read(devname, phyAddr, 0x1, &phyStatus);
                printf("\nphyStatus: 0x%04x\n", phyStatus);
                printf("ecntrl:   0x%08x\n", fec->eth->ecntrl);
                printf("ievent:   0x%08x\n", fec->eth->ievent);
                printf("x_status: 0x%08x\n", fec->eth->x_status);
                printf("rfifo: status  0x%08x\n", fec->eth->rfifo_status);

                printf("       control 0x%08x\n", fec->eth->rfifo_cntrl);
                printf("       lrfp    0x%08x\n", fec->eth->rfifo_lrf_ptr);
                printf("       lwfp    0x%08x\n", fec->eth->rfifo_lwf_ptr);
                printf("       alarm   0x%08x\n", fec->eth->rfifo_alarm);
                printf("       readptr 0x%08x\n", fec->eth->rfifo_rdptr);
                printf("       writptr 0x%08x\n", fec->eth->rfifo_wrptr);
        }
}
#endif /* DEBUG */

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

static int mpc5xxx_fec_send(struct eth_device *dev, void *eth_data,
                int data_length)
{
        /*
         * This routine transmits one frame.  This routine only accepts
         * 6-byte Ethernet addresses.
         */
        mpc5xxx_fec_priv *fec = (mpc5xxx_fec_priv *)dev->priv;
        volatile FEC_TBD *pTbd;

#if (DEBUG & 0x20)
        printf("tbd status: 0x%04x\n", fec->tbdBase[0].status);
        tfifo_print(dev->name, fec);
#endif

        /*
         * Clear Tx BD ring at first
         */
        mpc5xxx_fec_tbd_scrub(fec);

        /*
         * Check for valid length of data.
         */
        if ((data_length > 1500) || (data_length <= 0)) {
                return -1;
        }

        /*
         * Check the number of vacant TxBDs.
         */
        if (fec->cleanTbdNum < 1) {
#if (DEBUG & 0x20)
                printf("No available TxBDs ...\n");
#endif
                return -1;
        }

        /*
         * Get the first TxBD to send the mac header
         */
        pTbd = &fec->tbdBase[fec->tbdIndex];
        pTbd->dataLength = data_length;
        pTbd->dataPointer = (uint32)eth_data;
        pTbd->status |= FEC_TBD_LAST | FEC_TBD_TC | FEC_TBD_READY;
        fec->tbdIndex = (fec->tbdIndex + 1) % FEC_TBD_NUM;

#if (DEBUG & 0x100)
        printf("SDMA_TASK_ENABLE, fec->tbdIndex = %d \n", fec->tbdIndex);
#endif

        /*
         * Kick the MII i/f
         */
        if (fec->xcv_type != SEVENWIRE) {
                uint16 phyStatus;
                miiphy_read(dev->name, 0, 0x1, &phyStatus);
        }

        /*
         * Enable SmartDMA transmit task
         */

#if (DEBUG & 0x20)
        tfifo_print(dev->name, fec);
#endif
        SDMA_TASK_ENABLE (FEC_XMIT_TASK_NO);
#if (DEBUG & 0x20)
        tfifo_print(dev->name, fec);
#endif
#if (DEBUG & 0x8)
        printf( "+" );
#endif

        fec->cleanTbdNum -= 1;

#if (DEBUG & 0x129) && (DEBUG & 0x80000000)
        printf ("smartDMA ethernet Tx task enabled\n");
#endif
        /*
         * wait until frame is sent .
         */
        while (pTbd->status & FEC_TBD_READY) {
                udelay(10);
#if (DEBUG & 0x8)
                printf ("TDB status = %04x\n", pTbd->status);
#endif
        }

        return 0;
}


/********************************************************************/
static int mpc5xxx_fec_recv(struct eth_device *dev)
{
        /*
         * This command pulls one frame from the card
         */
        mpc5xxx_fec_priv *fec = (mpc5xxx_fec_priv *)dev->priv;
        volatile FEC_RBD *pRbd = &fec->rbdBase[fec->rbdIndex];
        unsigned long ievent;
        int frame_length, len = 0;
        NBUF *frame;
        uchar buff[FEC_MAX_PKT_SIZE];

#if (DEBUG & 0x1)
        printf ("mpc5xxx_fec_recv %d Start...\n", fec->rbdIndex);
#endif
#if (DEBUG & 0x8)
        printf( "-" );
#endif

        /*
         * Check if any critical events have happened
         */
        ievent = fec->eth->ievent;
        fec->eth->ievent = ievent;
        if (ievent & 0x20060000) {
                /* BABT, Rx/Tx FIFO errors */
                mpc5xxx_fec_halt(dev);
                mpc5xxx_fec_init(dev, NULL);
                return 0;
        }
        if (ievent & 0x80000000) {
                /* Heartbeat error */
                fec->eth->x_cntrl |= 0x00000001;
        }
        if (ievent & 0x10000000) {
                /* Graceful stop complete */
                if (fec->eth->x_cntrl & 0x00000001) {
                        mpc5xxx_fec_halt(dev);
                        fec->eth->x_cntrl &= ~0x00000001;
                        mpc5xxx_fec_init(dev, NULL);
                }
        }

        if (!(pRbd->status & FEC_RBD_EMPTY)) {
                if ((pRbd->status & FEC_RBD_LAST) && !(pRbd->status & FEC_RBD_ERR) &&
                        ((pRbd->dataLength - 4) > 14)) {

                        /*
                         * Get buffer address and size
                         */
                        frame = (NBUF *)pRbd->dataPointer;
                        frame_length = pRbd->dataLength - 4;

#if (DEBUG & 0x20)
                        {
                                int i;
                                printf("recv data hdr:");
                                for (i = 0; i < 14; i++)
                                        printf("%x ", *(frame->head + i));
                                printf("\n");
                        }
#endif
                        /*
                         *  Fill the buffer and pass it to upper layers
                         */
                        memcpy(buff, frame->head, 14);
                        memcpy(buff + 14, frame->data, frame_length);
                        NetReceive(buff, frame_length);
                        len = frame_length;
                }
                /*
                 * Reset buffer descriptor as empty
                 */
                mpc5xxx_fec_rbd_clean(fec, pRbd);
        }
        SDMA_CLEAR_IEVENT (FEC_RECV_TASK_NO);
        return len;
}


/********************************************************************/
int mpc5xxx_fec_initialize(bd_t * bis)
{
        mpc5xxx_fec_priv *fec;
        struct eth_device *dev;
        char *tmp, *end;
        char env_enetaddr[6];
        int i;

        fec = (mpc5xxx_fec_priv *)malloc(sizeof(*fec));
        dev = (struct eth_device *)malloc(sizeof(*dev));
        memset(dev, 0, sizeof *dev);

        fec->eth = (ethernet_regs *)MPC5XXX_FEC;
        fec->tbdBase = (FEC_TBD *)FEC_BD_BASE;
        fec->rbdBase = (FEC_RBD *)(FEC_BD_BASE + FEC_TBD_NUM * sizeof(FEC_TBD));
#if defined(CONFIG_MPC5xxx_FEC_MII100)
        fec->xcv_type = MII100;
#elif defined(CONFIG_MPC5xxx_FEC_MII10)
        fec->xcv_type = MII10;
#elif defined(CONFIG_MPC5xxx_FEC_SEVENWIRE)
        fec->xcv_type = SEVENWIRE;
#else
#error fec->xcv_type not initialized.
#endif
        if (fec->xcv_type != SEVENWIRE) {
                /*
                 * Set MII_SPEED = (1/(mii_speed * 2)) * System Clock
                 * and do not drop the Preamble.
                 * No MII for 7-wire mode
                 */
                fec->eth->mii_speed = (((gd->arch.ipb_clk >> 20) / 5) << 1);
        }

        dev->priv = (void *)fec;
        dev->iobase = MPC5XXX_FEC;
        dev->init = mpc5xxx_fec_init;
        dev->halt = mpc5xxx_fec_halt;
        dev->send = mpc5xxx_fec_send;
        dev->recv = mpc5xxx_fec_recv;

        sprintf(dev->name, "FEC");
        eth_register(dev);

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
        miiphy_register (dev->name,
                        fec5xxx_miiphy_read, fec5xxx_miiphy_write);
#endif

        /*
         * Try to set the mac address now. The fec mac address is
         * a garbage after reset. When not using fec for booting
         * the Linux fec driver will try to work with this garbage.
         */
        tmp = getenv("ethaddr");
        if (tmp) {
                for (i=0; i<6; i++) {
                        env_enetaddr[i] = tmp ? simple_strtoul(tmp, &end, 16) : 0;
                        if (tmp)
                                tmp = (*end) ? end+1 : end;
                }
                mpc5xxx_fec_set_hwaddr(fec, env_enetaddr);
        }

        return 1;
}

/* MII-interface related functions */
/********************************************************************/
int fec5xxx_miiphy_read(const char *devname, uint8 phyAddr, uint8 regAddr, uint16 * retVal)
{
        ethernet_regs *eth = (ethernet_regs *)MPC5XXX_FEC;
        uint32 reg;             /* convenient holder for the PHY register */
        uint32 phy;             /* convenient holder for the PHY */
        int timeout = 0xffff;

        /*
         * reading from any PHY's register is done by properly
         * programming the FEC's MII data register.
         */
        reg = regAddr << FEC_MII_DATA_RA_SHIFT;
        phy = phyAddr << FEC_MII_DATA_PA_SHIFT;

        eth->mii_data = (FEC_MII_DATA_ST | FEC_MII_DATA_OP_RD | FEC_MII_DATA_TA | phy | reg);

        /*
         * wait for the related interrupt
         */
        while ((timeout--) && (!(eth->ievent & 0x00800000))) ;

        if (timeout == 0) {
#if (DEBUG & 0x2)
                printf ("Read MDIO failed...\n");
#endif
                return -1;
        }

        /*
         * clear mii interrupt bit
         */
        eth->ievent = 0x00800000;

        /*
         * it's now safe to read the PHY's register
         */
        *retVal = (uint16) eth->mii_data;

        return 0;
}

/********************************************************************/
int fec5xxx_miiphy_write(const char *devname, uint8 phyAddr, uint8 regAddr, uint16 data)
{
        ethernet_regs *eth = (ethernet_regs *)MPC5XXX_FEC;
        uint32 reg;             /* convenient holder for the PHY register */
        uint32 phy;             /* convenient holder for the PHY */

        int timeout = 0xffff;

        reg = regAddr << FEC_MII_DATA_RA_SHIFT;
        phy = phyAddr << FEC_MII_DATA_PA_SHIFT;

        eth->mii_data = (FEC_MII_DATA_ST | FEC_MII_DATA_OP_WR |
                        FEC_MII_DATA_TA | phy | reg | data);

        /*
         * wait for the MII interrupt
         */
        while ((timeout--) && (!(eth->ievent & 0x00800000))) ;

        if (timeout == 0) {
#if (DEBUG & 0x2)
                printf ("Write MDIO failed...\n");
#endif
                return -1;
        }

        /*
         * clear MII interrupt bit
         */
        eth->ievent = 0x00800000;

        return 0;
}