/*
 * (C) Copyright 2009
 * Marvell Semiconductor <www.marvell.com>
 * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
 *
 * (C) Copyright 2003
 * Ingo Assmus <ingo.assmus@keymile.com>
 *
 * based on - Driver for MV64360X 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., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */

#include <common.h>
#include <net.h>
#include <malloc.h>
#include <miiphy.h>
#include <asm/errno.h>
#include <asm/types.h>
#include <asm/byteorder.h>
#include <asm/arch/kirkwood.h>
#include "kirkwood_egiga.h"

#define KIRKWOOD_PHY_ADR_REQUEST 0xee

/*
 * smi_reg_read - miiphy_read callback function.
 *
 * Returns 16bit phy register value, or 0xffff on error
 */
static int smi_reg_read(char *devname, u8 phy_adr, u8 reg_ofs, u16 * data)
{
        struct eth_device *dev = eth_get_dev_by_name(devname);
        struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
        struct kwgbe_registers *regs = dkwgbe->regs;
        u32 smi_reg;
        u32 timeout;

        /* Phyadr read request */
        if (phy_adr == KIRKWOOD_PHY_ADR_REQUEST &&
                        reg_ofs == KIRKWOOD_PHY_ADR_REQUEST) {
                /* */
                *data = (u16) (KWGBEREG_RD(regs->phyadr) & PHYADR_MASK);
                return 0;
        }
        /* check parameters */
        if (phy_adr > PHYADR_MASK) {
                printf("Err..(%s) Invalid PHY address %d\n",
                        __FUNCTION__, phy_adr);
                return -EFAULT;
        }
        if (reg_ofs > PHYREG_MASK) {
                printf("Err..(%s) Invalid register offset %d\n",
                        __FUNCTION__, reg_ofs);
                return -EFAULT;
        }

        timeout = KWGBE_PHY_SMI_TIMEOUT;
        /* wait till the SMI is not busy */
        do {
                /* read smi register */
                smi_reg = KWGBEREG_RD(regs->smi);
                if (timeout-- == 0) {
                        printf("Err..(%s) SMI busy timeout\n", __FUNCTION__);
                        return -EFAULT;
                }
        } while (smi_reg & KWGBE_PHY_SMI_BUSY_MASK);

        /* fill the phy address and regiser offset and read opcode */
        smi_reg = (phy_adr << KWGBE_PHY_SMI_DEV_ADDR_OFFS)
                | (reg_ofs << KWGBE_SMI_REG_ADDR_OFFS)
                | KWGBE_PHY_SMI_OPCODE_READ;

        /* write the smi register */
        KWGBEREG_WR(regs->smi, smi_reg);

        /*wait till read value is ready */
        timeout = KWGBE_PHY_SMI_TIMEOUT;

        do {
                /* read smi register */
                smi_reg = KWGBEREG_RD(regs->smi);
                if (timeout-- == 0) {
                        printf("Err..(%s) SMI read ready timeout\n",
                                __FUNCTION__);
                        return -EFAULT;
                }
        } while (!(smi_reg & KWGBE_PHY_SMI_READ_VALID_MASK));

        /* Wait for the data to update in the SMI register */
        for (timeout = 0; timeout < KWGBE_PHY_SMI_TIMEOUT; timeout++) ;

        *data = (u16) (KWGBEREG_RD(regs->smi) & KWGBE_PHY_SMI_DATA_MASK);

        debug("%s:(adr %d, off %d) value= %04x\n", __FUNCTION__, phy_adr,
                reg_ofs, *data);

        return 0;
}

/*
 * smi_reg_write - imiiphy_write callback function.
 *
 * Returns 0 if write succeed, -EINVAL on bad parameters
 * -ETIME on timeout
 */
static int smi_reg_write(char *devname, u8 phy_adr, u8 reg_ofs, u16 data)
{
        struct eth_device *dev = eth_get_dev_by_name(devname);
        struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
        struct kwgbe_registers *regs = dkwgbe->regs;
        u32 smi_reg;
        u32 timeout;

        /* Phyadr write request*/
        if (phy_adr == KIRKWOOD_PHY_ADR_REQUEST &&
                        reg_ofs == KIRKWOOD_PHY_ADR_REQUEST) {
                KWGBEREG_WR(regs->phyadr, data);
                return 0;
        }

        /* check parameters */
        if (phy_adr > PHYADR_MASK) {
                printf("Err..(%s) Invalid phy address\n", __FUNCTION__);
                return -EINVAL;
        }
        if (reg_ofs > PHYREG_MASK) {
                printf("Err..(%s) Invalid register offset\n", __FUNCTION__);
                return -EINVAL;
        }

        /* wait till the SMI is not busy */
        timeout = KWGBE_PHY_SMI_TIMEOUT;
        do {
                /* read smi register */
                smi_reg = KWGBEREG_RD(regs->smi);
                if (timeout-- == 0) {
                        printf("Err..(%s) SMI busy timeout\n", __FUNCTION__);
                        return -ETIME;
                }
        } while (smi_reg & KWGBE_PHY_SMI_BUSY_MASK);

        /* fill the phy addr and reg offset and write opcode and data */
        smi_reg = (data << KWGBE_PHY_SMI_DATA_OFFS);
        smi_reg |= (phy_adr << KWGBE_PHY_SMI_DEV_ADDR_OFFS)
                | (reg_ofs << KWGBE_SMI_REG_ADDR_OFFS);
        smi_reg &= ~KWGBE_PHY_SMI_OPCODE_READ;

        /* write the smi register */
        KWGBEREG_WR(regs->smi, smi_reg);

        return 0;
}

/* Stop and checks all queues */
static void stop_queue(u32 * qreg)
{
        u32 reg_data;

        reg_data = readl(qreg);

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

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

/*
 * set_access_control - Config address decode parameters for Ethernet unit
 *
 * This function configures the address decode parameters for the Gigabit
 * Ethernet Controller according the given parameters struct.
 *
 * @regs        Register struct pointer.
 * @param       Address decode parameter struct.
 */
static void set_access_control(struct kwgbe_registers *regs,
                                struct kwgbe_winparam *param)
{
        u32 access_prot_reg;

        /* Set access control register */
        access_prot_reg = KWGBEREG_RD(regs->epap);
        /* clear window permission */
        access_prot_reg &= (~(3 << (param->win * 2)));
        access_prot_reg |= (param->access_ctrl << (param->win * 2));
        KWGBEREG_WR(regs->epap, access_prot_reg);

        /* Set window Size reg (SR) */
        KWGBEREG_WR(regs->barsz[param->win].size,
                        (((param->size / 0x10000) - 1) << 16));

        /* Set window Base address reg (BA) */
        KWGBEREG_WR(regs->barsz[param->win].bar,
                        (param->target | param->attrib | param->base_addr));
        /* High address remap reg (HARR) */
        if (param->win < 4)
                KWGBEREG_WR(regs->ha_remap[param->win], param->high_addr);

        /* Base address enable reg (BARER) */
        if (param->enable == 1)
                KWGBEREG_BITS_RESET(regs->bare, (1 << param->win));
        else
                KWGBEREG_BITS_SET(regs->bare, (1 << param->win));
}

static void set_dram_access(struct kwgbe_registers *regs)
{
        struct kwgbe_winparam win_param;
        int i;

        for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
                /* Set access parameters for DRAM bank i */
                win_param.win = i;      /* Use Ethernet window i */
                /* Window target - DDR */
                win_param.target = KWGBE_TARGET_DRAM;
                /* Enable full access */
                win_param.access_ctrl = EWIN_ACCESS_FULL;
                win_param.high_addr = 0;
                /* Get bank base */
                win_param.base_addr = kw_sdram_bar(i);
                win_param.size = kw_sdram_bs(i);        /* Get bank size */
                if (win_param.size == 0)
                        win_param.enable = 0;
                else
                        win_param.enable = 1;   /* Enable the access */

                /* Enable DRAM bank */
                switch (i) {
                case 0:
                        win_param.attrib = EBAR_DRAM_CS0;
                        break;
                case 1:
                        win_param.attrib = EBAR_DRAM_CS1;
                        break;
                case 2:
                        win_param.attrib = EBAR_DRAM_CS2;
                        break;
                case 3:
                        win_param.attrib = EBAR_DRAM_CS3;
                        break;
                default:
                        /* invalide bank, disable access */
                        win_param.enable = 0;
                        win_param.attrib = 0;
                        break;
                }
                /* Set the access control for address window(EPAPR) RD/WR */
                set_access_control(regs, &win_param);
        }
}

/*
 * port_init_mac_tables - Clear all entrance in the UC, SMC and OMC tables
 *
 * Go through all the DA filter tables (Unicast, Special Multicast & Other
 * Multicast) and set each entry to 0.
 */
static void port_init_mac_tables(struct kwgbe_registers *regs)
{
        int table_index;

        /* Clear DA filter unicast table (Ex_dFUT) */
        for (table_index = 0; table_index < 4; ++table_index)
                KWGBEREG_WR(regs->dfut[table_index], 0);

        for (table_index = 0; table_index < 64; ++table_index) {
                /* Clear DA filter special multicast table (Ex_dFSMT) */
                KWGBEREG_WR(regs->dfsmt[table_index], 0);
                /* Clear DA filter other multicast table (Ex_dFOMT) */
                KWGBEREG_WR(regs->dfomt[table_index], 0);
        }
}

/*
 * port_uc_addr - This function Set the port unicast address table
 *
 * This function locates the proper entry in the Unicast table for the
 * specified MAC nibble and sets its properties according to function
 * parameters.
 * This function add/removes MAC addresses from the port unicast address
 * table.
 *
 * @uc_nibble   Unicast MAC Address last nibble.
 * @option      0 = Add, 1 = remove address.
 *
 * RETURN: 1 if output succeeded. 0 if option parameter is invalid.
 */
static int port_uc_addr(struct kwgbe_registers *regs, u8 uc_nibble,
                        int option)
{
        u32 unicast_reg;
        u32 tbl_offset;
        u32 reg_offset;

        /* Locate the Unicast table entry */
        uc_nibble = (0xf & uc_nibble);
        /* Register offset from unicast table base */
        tbl_offset = (uc_nibble / 4);
        /* Entry offset within the above register */
        reg_offset = uc_nibble % 4;

        switch (option) {
        case REJECT_MAC_ADDR:
                /*
                 * Clear accepts frame bit at specified unicast
                 * DA table entry
                 */
                unicast_reg = KWGBEREG_RD(regs->dfut[tbl_offset]);
                unicast_reg &= (0xFF << (8 * reg_offset));
                KWGBEREG_WR(regs->dfut[tbl_offset], unicast_reg);
                break;
        case ACCEPT_MAC_ADDR:
                /* Set accepts frame bit at unicast DA filter table entry */
                unicast_reg = KWGBEREG_RD(regs->dfut[tbl_offset]);
                unicast_reg &= (0xFF << (8 * reg_offset));
                unicast_reg |= ((0x01 | (RXUQ << 1)) << (8 * reg_offset));
                KWGBEREG_WR(regs->dfut[tbl_offset], unicast_reg);
                break;
        default:
                return 0;
        }
        return 1;
}

/*
 * port_uc_addr_set - This function Set the port Unicast address.
 */
static void port_uc_addr_set(struct kwgbe_registers *regs, u8 * p_addr)
{
        u32 mac_h;
        u32 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);

        KWGBEREG_WR(regs->macal, mac_l);
        KWGBEREG_WR(regs->macah, mac_h);

        /* Accept frames of this address */
        port_uc_addr(regs, p_addr[5], ACCEPT_MAC_ADDR);
}

/*
 * kwgbe_init_rx_desc_ring - Curve a Rx chain desc list and buffer in memory.
 */
static void kwgbe_init_rx_desc_ring(struct kwgbe_device *dkwgbe)
{
        struct kwgbe_rxdesc *p_rx_desc;
        int i;

        /* initialize the Rx descriptors ring */
        p_rx_desc = dkwgbe->p_rxdesc;
        for (i = 0; i < RINGSZ; i++) {
                p_rx_desc->cmd_sts =
                        KWGBE_BUFFER_OWNED_BY_DMA | KWGBE_RX_EN_INTERRUPT;
                p_rx_desc->buf_size = PKTSIZE_ALIGN;
                p_rx_desc->byte_cnt = 0;
                p_rx_desc->buf_ptr = dkwgbe->p_rxbuf + i * PKTSIZE_ALIGN;
                if (i == (RINGSZ - 1))
                        p_rx_desc->nxtdesc_p = dkwgbe->p_rxdesc;
                else {
                        p_rx_desc->nxtdesc_p = (struct kwgbe_rxdesc *)
                                ((u32) p_rx_desc + KW_RXQ_DESC_ALIGNED_SIZE);
                        p_rx_desc = p_rx_desc->nxtdesc_p;
                }
        }
        dkwgbe->p_rxdesc_curr = dkwgbe->p_rxdesc;
}

static int kwgbe_init(struct eth_device *dev)
{
        struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
        struct kwgbe_registers *regs = dkwgbe->regs;
        int i;

        /* setup RX rings */
        kwgbe_init_rx_desc_ring(dkwgbe);

        /* Clear the ethernet port interrupts */
        KWGBEREG_WR(regs->ic, 0);
        KWGBEREG_WR(regs->ice, 0);
        /* Unmask RX buffer and TX end interrupt */
        KWGBEREG_WR(regs->pim, INT_CAUSE_UNMASK_ALL);
        /* Unmask phy and link status changes interrupts */
        KWGBEREG_WR(regs->peim, INT_CAUSE_UNMASK_ALL_EXT);

        set_dram_access(regs);
        port_init_mac_tables(regs);
        port_uc_addr_set(regs, dkwgbe->dev.enetaddr);

        /* Assign port configuration and command. */
        KWGBEREG_WR(regs->pxc, PRT_CFG_VAL);
        KWGBEREG_WR(regs->pxcx, PORT_CFG_EXTEND_VALUE);
        KWGBEREG_WR(regs->psc0, PORT_SERIAL_CONTROL_VALUE);
        /* Disable port initially */
        KWGBEREG_BITS_SET(regs->psc0, KWGBE_SERIAL_PORT_EN);

        /* Assign port SDMA configuration */
        KWGBEREG_WR(regs->sdc, PORT_SDMA_CFG_VALUE);
        KWGBEREG_WR(regs->tqx[0].qxttbc, QTKNBKT_DEF_VAL);
        KWGBEREG_WR(regs->tqx[0].tqxtbc, (QMTBS_DEF_VAL << 16) | QTKNRT_DEF_VAL);
        /* Turn off the port/RXUQ bandwidth limitation */
        KWGBEREG_WR(regs->pmtu, 0);

        /* Set maximum receive buffer to 9700 bytes */
        KWGBEREG_WR(regs->psc0, KWGBE_MAX_RX_PACKET_9700BYTE
                        | (KWGBEREG_RD(regs->psc0) & MRU_MASK));

        /*
         * Set ethernet MTU for leaky bucket mechanism to 0 - this will
         * disable the leaky bucket mechanism .
         */
        KWGBEREG_WR(regs->pmtu, 0);

        /* Assignment of Rx CRDB of given RXUQ */
        KWGBEREG_WR(regs->rxcdp[RXUQ].rxcdp, (u32) dkwgbe->p_rxdesc_curr);
        /* Enable port Rx. */
        KWGBEREG_WR(regs->rqc, (1 << RXUQ));

#if (defined (CONFIG_MII) || defined (CONFIG_CMD_MII)) \
         && defined (CONFIG_SYS_FAULT_ECHO_LINK_DOWN)
        /* Wait up to 5s for the link status */
        for (i = 0; i < 5; i++) {
                u16 phyadr;

                miiphy_read(dev->name, KIRKWOOD_PHY_ADR_REQUEST,
                                KIRKWOOD_PHY_ADR_REQUEST, &phyadr);
                /* Return if we get link up */
                if (miiphy_link(dev->name, phyadr))
                        return 0;
                udelay(1000000);
        }

        printf("No link on %s\n", dev->name);
        return -1;
#endif
        return 0;
}

static int kwgbe_halt(struct eth_device *dev)
{
        struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
        struct kwgbe_registers *regs = dkwgbe->regs;

        /* Disable all gigE address decoder */
        KWGBEREG_WR(regs->bare, 0x3f);

        stop_queue(&regs->tqc);
        stop_queue(&regs->rqc);

        /* Enable port */
        KWGBEREG_BITS_RESET(regs->psc0, KWGBE_SERIAL_PORT_EN);
        /* Set port is not reset */
        KWGBEREG_BITS_RESET(regs->psc1, 1 << 4);
#ifdef CONFIG_SYS_MII_MODE
        /* Set MMI interface up */
        KWGBEREG_BITS_RESET(regs->psc1, 1 << 3);
#endif
        /* Disable & mask ethernet port interrupts */
        KWGBEREG_WR(regs->ic, 0);
        KWGBEREG_WR(regs->ice, 0);
        KWGBEREG_WR(regs->pim, 0);
        KWGBEREG_WR(regs->peim, 0);

        return 0;
}

static int kwgbe_send(struct eth_device *dev, volatile void *dataptr,
                      int datasize)
{
        struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
        struct kwgbe_registers *regs = dkwgbe->regs;
        struct kwgbe_txdesc *p_txdesc = dkwgbe->p_txdesc;
        void *p = (void *)dataptr;
        u32 cmd_sts;

        /* Copy buffer if it's misaligned */
        if ((u32) dataptr & 0x07) {
                if (datasize > PKTSIZE_ALIGN) {
                        printf("Non-aligned data too large (%d)\n",
                                        datasize);
                        return -1;
                }

                memcpy(dkwgbe->p_aligned_txbuf, p, datasize);
                p = dkwgbe->p_aligned_txbuf;
        }

        p_txdesc->cmd_sts = KWGBE_ZERO_PADDING | KWGBE_GEN_CRC;
        p_txdesc->cmd_sts |= KWGBE_TX_FIRST_DESC | KWGBE_TX_LAST_DESC;
        p_txdesc->cmd_sts |= KWGBE_BUFFER_OWNED_BY_DMA;
        p_txdesc->cmd_sts |= KWGBE_TX_EN_INTERRUPT;
        p_txdesc->buf_ptr = (u8 *) p;
        p_txdesc->byte_cnt = datasize;

        /* Apply send command using zeroth RXUQ */
        KWGBEREG_WR(regs->tcqdp[TXUQ], (u32) p_txdesc);
        KWGBEREG_WR(regs->tqc, (1 << TXUQ));

        /*
         * wait for packet xmit completion
         */
        cmd_sts = readl(&p_txdesc->cmd_sts);
        while (cmd_sts & KWGBE_BUFFER_OWNED_BY_DMA) {
                /* return fail if error is detected */
                if ((cmd_sts & (KWGBE_ERROR_SUMMARY | KWGBE_TX_LAST_FRAME)) ==
                                (KWGBE_ERROR_SUMMARY | KWGBE_TX_LAST_FRAME) &&
                                cmd_sts & (KWGBE_UR_ERROR | KWGBE_RL_ERROR)) {
                        printf("Err..(%s) in xmit packet\n", __FUNCTION__);
                        return -1;
                }
                cmd_sts = readl(&p_txdesc->cmd_sts);
        };
        return 0;
}

static int kwgbe_recv(struct eth_device *dev)
{
        struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
        struct kwgbe_rxdesc *p_rxdesc_curr = dkwgbe->p_rxdesc_curr;
        u32 cmd_sts;
        u32 timeout = 0;

        /* wait untill rx packet available or timeout */
        do {
                if (timeout < KWGBE_PHY_SMI_TIMEOUT)
                        timeout++;
                else {
                        debug("%s time out...\n", __FUNCTION__);
                        return -1;
                }
        } while (readl(&p_rxdesc_curr->cmd_sts) & KWGBE_BUFFER_OWNED_BY_DMA);

        if (p_rxdesc_curr->byte_cnt != 0) {
                debug("%s: Received %d byte Packet @ 0x%x (cmd_sts= %08x)\n",
                        __FUNCTION__, (u32) p_rxdesc_curr->byte_cnt,
                        (u32) p_rxdesc_curr->buf_ptr,
                        (u32) p_rxdesc_curr->cmd_sts);
        }

        /*
         * In case received a packet without first/last bits on
         * OR the error summary bit is on,
         * the packets needs to be dropeed.
         */
        cmd_sts = readl(&p_rxdesc_curr->cmd_sts);

        if ((cmd_sts &
                (KWGBE_RX_FIRST_DESC | KWGBE_RX_LAST_DESC))
                != (KWGBE_RX_FIRST_DESC | KWGBE_RX_LAST_DESC)) {

                printf("Err..(%s) Dropping packet spread on"
                        " multiple descriptors\n", __FUNCTION__);

        } else if (cmd_sts & KWGBE_ERROR_SUMMARY) {

                printf("Err..(%s) Dropping packet with errors\n",
                        __FUNCTION__);

        } else {
                /* !!! call higher layer processing */
                debug("%s: Sending Received packet to"
                        " upper layer (NetReceive)\n", __FUNCTION__);

                /* let the upper layer handle the packet */
                NetReceive((p_rxdesc_curr->buf_ptr + RX_BUF_OFFSET),
                        (int)(p_rxdesc_curr->byte_cnt - RX_BUF_OFFSET));
        }
        /*
         * free these descriptors and point next in the ring
         */
        p_rxdesc_curr->cmd_sts =
                KWGBE_BUFFER_OWNED_BY_DMA | KWGBE_RX_EN_INTERRUPT;
        p_rxdesc_curr->buf_size = PKTSIZE_ALIGN;
        p_rxdesc_curr->byte_cnt = 0;

        writel((unsigned)p_rxdesc_curr->nxtdesc_p, &dkwgbe->p_rxdesc_curr);

        return 0;
}

int kirkwood_egiga_initialize(bd_t * bis)
{
        struct kwgbe_device *dkwgbe;
        struct eth_device *dev;
        int devnum;
        char *s;
        u8 used_ports[MAX_KWGBE_DEVS] = CONFIG_KIRKWOOD_EGIGA_PORTS;

        for (devnum = 0; devnum < MAX_KWGBE_DEVS; devnum++) {
                /*skip if port is configured not to use */
                if (used_ports[devnum] == 0)
                        continue;

                if (!(dkwgbe = malloc(sizeof(struct kwgbe_device))))
                        goto error1;

                memset(dkwgbe, 0, sizeof(struct kwgbe_device));

                if (!(dkwgbe->p_rxdesc =
                      (struct kwgbe_rxdesc *)memalign(PKTALIGN,
                                                KW_RXQ_DESC_ALIGNED_SIZE
                                                * RINGSZ + 1)))
                        goto error2;

                if (!(dkwgbe->p_rxbuf = (u8 *) memalign(PKTALIGN, RINGSZ
                                                        * PKTSIZE_ALIGN + 1)))
                        goto error3;

                if (!(dkwgbe->p_aligned_txbuf = memalign(8, PKTSIZE_ALIGN)))
                        goto error4;

                if (!(dkwgbe->p_txdesc = (struct kwgbe_txdesc *)
                      memalign(PKTALIGN, sizeof(struct kwgbe_txdesc) + 1))) {
                        free(dkwgbe->p_aligned_txbuf);
                      error4:
                        free(dkwgbe->p_rxbuf);
                      error3:
                        free(dkwgbe->p_rxdesc);
                      error2:
                        free(dkwgbe);
                      error1:
                        printf("Err.. %s Failed to allocate memory\n",
                                __FUNCTION__);
                        return -1;
                }

                dev = &dkwgbe->dev;

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

                /* Extract the MAC address from the environment */
                switch (devnum) {
                case 0:
                        dkwgbe->regs = (void *)KW_EGIGA0_BASE;
                        s = "ethaddr";
                        break;
                case 1:
                        dkwgbe->regs = (void *)KW_EGIGA1_BASE;
                        s = "eth1addr";
                        break;
                default:        /* this should never happen */
                        printf("Err..(%s) Invalid device number %d\n",
                                __FUNCTION__, devnum);
                        return -1;
                }

                while (!eth_getenv_enetaddr(s, dev->enetaddr)) {
                        /* Generate Random Private MAC addr if not set */
                        dev->enetaddr[0] = 0x02;
                        dev->enetaddr[1] = 0x50;
                        dev->enetaddr[2] = 0x43;
                        dev->enetaddr[3] = get_random_hex();
                        dev->enetaddr[4] = get_random_hex();
                        dev->enetaddr[5] = get_random_hex();
                        eth_setenv_enetaddr(s, dev->enetaddr);
                }

                dev->init = (void *)kwgbe_init;
                dev->halt = (void *)kwgbe_halt;
                dev->send = (void *)kwgbe_send;
                dev->recv = (void *)kwgbe_recv;

                eth_register(dev);

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
                miiphy_register(dev->name, smi_reg_read, smi_reg_write);
                /* Set phy address of the port */
                miiphy_write(dev->name, KIRKWOOD_PHY_ADR_REQUEST,
                                KIRKWOOD_PHY_ADR_REQUEST, PHY_BASE_ADR + devnum);
#endif
        }
        return 0;
}