// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2011
 * eInfochips Ltd. <www.einfochips.com>
 * Written-by: Ajay Bhargav <contact@8051projects.net>
 *
 * (C) Copyright 2010
 * Marvell Semiconductor <www.marvell.com>
 * Contributor: Mahavir Jain <mjain@marvell.com>
 */

#include <common.h>
#include <log.h>
#include <net.h>
#include <malloc.h>
#include <miiphy.h>
#include <netdev.h>
#include <asm/types.h>
#include <asm/byteorder.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/mii.h>
#include <asm/io.h>
#include <asm/arch/armada100.h>
#include "armada100_fec.h"

#define  PHY_ADR_REQ     0xFF   /* Magic number to read/write PHY address */

#ifdef DEBUG
static int eth_dump_regs(struct eth_device *dev)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;
        unsigned int i = 0;

        printf("\noffset: phy_adr, value: 0x%x\n", readl(&regs->phyadr));
        printf("offset: smi, value: 0x%x\n", readl(&regs->smi));
        for (i = 0x400; i <= 0x4e4; i += 4)
                printf("offset: 0x%x, value: 0x%x\n",
                        i, readl(ARMD1_FEC_BASE + i));
        return 0;
}
#endif

static int armdfec_phy_timeout(u32 *reg, u32 flag, int cond)
{
        u32 timeout = PHY_WAIT_ITERATIONS;
        u32 reg_val;

        while (--timeout) {
                reg_val = readl(reg);
                if (cond && (reg_val & flag))
                        break;
                else if (!cond && !(reg_val & flag))
                        break;
                udelay(PHY_WAIT_MICRO_SECONDS);
        }
        return !timeout;
}

static int smi_reg_read(struct mii_dev *bus, int phy_addr, int devad,
                        int phy_reg)
{
        u16 value = 0;
        struct eth_device *dev = eth_get_dev_by_name(bus->name);
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;
        u32 val;

        if (phy_addr == PHY_ADR_REQ && phy_reg == PHY_ADR_REQ) {
                val = readl(&regs->phyadr);
                value = val & 0x1f;
                return value;
        }

        /* check parameters */
        if (phy_addr > PHY_MASK) {
                printf("ARMD100 FEC: (%s) Invalid phy address: 0x%X\n",
                                __func__, phy_addr);
                return -EINVAL;
        }
        if (phy_reg > PHY_MASK) {
                printf("ARMD100 FEC: (%s) Invalid register offset: 0x%X\n",
                                __func__, phy_reg);
                return -EINVAL;
        }

        /* wait for the SMI register to become available */
        if (armdfec_phy_timeout(&regs->smi, SMI_BUSY, false)) {
                printf("ARMD100 FEC: (%s) PHY busy timeout\n",  __func__);
                return -1;
        }

        writel((phy_addr << 16) | (phy_reg << 21) | SMI_OP_R, &regs->smi);

        /* now wait for the data to be valid */
        if (armdfec_phy_timeout(&regs->smi, SMI_R_VALID, true)) {
                val = readl(&regs->smi);
                printf("ARMD100 FEC: (%s) PHY Read timeout, val=0x%x\n",
                                __func__, val);
                return -1;
        }
        val = readl(&regs->smi);
        value = val & 0xffff;

        return value;
}

static int smi_reg_write(struct mii_dev *bus, int phy_addr, int devad,
                         int phy_reg, u16 value)
{
        struct eth_device *dev = eth_get_dev_by_name(bus->name);
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;

        if (phy_addr == PHY_ADR_REQ && phy_reg == PHY_ADR_REQ) {
                clrsetbits_le32(&regs->phyadr, 0x1f, value & 0x1f);
                return 0;
        }

        /* check parameters */
        if (phy_addr > PHY_MASK) {
                printf("ARMD100 FEC: (%s) Invalid phy address\n", __func__);
                return -EINVAL;
        }
        if (phy_reg > PHY_MASK) {
                printf("ARMD100 FEC: (%s) Invalid register offset\n", __func__);
                return -EINVAL;
        }

        /* wait for the SMI register to become available */
        if (armdfec_phy_timeout(&regs->smi, SMI_BUSY, false)) {
                printf("ARMD100 FEC: (%s) PHY busy timeout\n",  __func__);
                return -1;
        }

        writel((phy_addr << 16) | (phy_reg << 21) | SMI_OP_W | (value & 0xffff),
                        &regs->smi);
        return 0;
}

/*
 * Abort any transmit and receive operations and put DMA
 * in idle state. AT and AR bits are cleared upon entering
 * in IDLE state. So poll those bits to verify operation.
 */
static void abortdma(struct eth_device *dev)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;
        int delay;
        int maxretries = 40;
        u32 tmp;

        while (--maxretries) {
                writel(SDMA_CMD_AR | SDMA_CMD_AT, &regs->sdma_cmd);
                udelay(100);

                delay = 10;
                while (--delay) {
                        tmp = readl(&regs->sdma_cmd);
                        if (!(tmp & (SDMA_CMD_AR | SDMA_CMD_AT)))
                                break;
                        udelay(10);
                }
                if (delay)
                        break;
        }

        if (!maxretries)
                printf("ARMD100 FEC: (%s) DMA Stuck\n", __func__);
}

static inline u32 nibble_swapping_32_bit(u32 x)
{
        return ((x & 0xf0f0f0f0) >> 4) | ((x & 0x0f0f0f0f) << 4);
}

static inline u32 nibble_swapping_16_bit(u32 x)
{
        return ((x & 0x0000f0f0) >> 4) | ((x & 0x00000f0f) << 4);
}

static inline u32 flip_4_bits(u32 x)
{
        return ((x & 0x01) << 3) | ((x & 0x002) << 1)
                | ((x & 0x04) >> 1) | ((x & 0x008) >> 3);
}

/*
 * This function will calculate the hash function of the address.
 * depends on the hash mode and hash size.
 * Inputs
 * mach             - the 2 most significant bytes of the MAC address.
 * macl             - the 4 least significant bytes of the MAC address.
 * Outputs
 * return the calculated entry.
 */
static u32 hash_function(u32 mach, u32 macl)
{
        u32 hashresult;
        u32 addrh;
        u32 addrl;
        u32 addr0;
        u32 addr1;
        u32 addr2;
        u32 addr3;
        u32 addrhswapped;
        u32 addrlswapped;

        addrh = nibble_swapping_16_bit(mach);
        addrl = nibble_swapping_32_bit(macl);

        addrhswapped = flip_4_bits(addrh & 0xf)
                + ((flip_4_bits((addrh >> 4) & 0xf)) << 4)
                + ((flip_4_bits((addrh >> 8) & 0xf)) << 8)
                + ((flip_4_bits((addrh >> 12) & 0xf)) << 12);

        addrlswapped = flip_4_bits(addrl & 0xf)
                + ((flip_4_bits((addrl >> 4) & 0xf)) << 4)
                + ((flip_4_bits((addrl >> 8) & 0xf)) << 8)
                + ((flip_4_bits((addrl >> 12) & 0xf)) << 12)
                + ((flip_4_bits((addrl >> 16) & 0xf)) << 16)
                + ((flip_4_bits((addrl >> 20) & 0xf)) << 20)
                + ((flip_4_bits((addrl >> 24) & 0xf)) << 24)
                + ((flip_4_bits((addrl >> 28) & 0xf)) << 28);

        addrh = addrhswapped;
        addrl = addrlswapped;

        addr0 = (addrl >> 2) & 0x03f;
        addr1 = (addrl & 0x003) | (((addrl >> 8) & 0x7f) << 2);
        addr2 = (addrl >> 15) & 0x1ff;
        addr3 = ((addrl >> 24) & 0x0ff) | ((addrh & 1) << 8);

        hashresult = (addr0 << 9) | (addr1 ^ addr2 ^ addr3);
        hashresult = hashresult & 0x07ff;
        return hashresult;
}

/*
 * This function will add an entry to the address table.
 * depends on the hash mode and hash size that was initialized.
 * Inputs
 * mach - the 2 most significant bytes of the MAC address.
 * macl - the 4 least significant bytes of the MAC address.
 * skip - if 1, skip this address.
 * rd   - the RD field in the address table.
 * Outputs
 * address table entry is added.
 * 0 if success.
 * -ENOSPC if table full
 */
static int add_del_hash_entry(struct armdfec_device *darmdfec, u32 mach,
                              u32 macl, u32 rd, u32 skip, int del)
{
        struct addr_table_entry_t *entry, *start;
        u32 newhi;
        u32 newlo;
        u32 i;

        newlo = (((mach >> 4) & 0xf) << 15)
                | (((mach >> 0) & 0xf) << 11)
                | (((mach >> 12) & 0xf) << 7)
                | (((mach >> 8) & 0xf) << 3)
                | (((macl >> 20) & 0x1) << 31)
                | (((macl >> 16) & 0xf) << 27)
                | (((macl >> 28) & 0xf) << 23)
                | (((macl >> 24) & 0xf) << 19)
                | (skip << HTESKIP) | (rd << HTERDBIT)
                | HTEVALID;

        newhi = (((macl >> 4) & 0xf) << 15)
                | (((macl >> 0) & 0xf) << 11)
                | (((macl >> 12) & 0xf) << 7)
                | (((macl >> 8) & 0xf) << 3)
                | (((macl >> 21) & 0x7) << 0);

        /*
         * Pick the appropriate table, start scanning for free/reusable
         * entries at the index obtained by hashing the specified MAC address
         */
        start = (struct addr_table_entry_t *)(darmdfec->htpr);
        entry = start + hash_function(mach, macl);
        for (i = 0; i < HOP_NUMBER; i++) {
                if (!(entry->lo & HTEVALID)) {
                        break;
                } else {
                        /* if same address put in same position */
                        if (((entry->lo & 0xfffffff8) == (newlo & 0xfffffff8))
                                        && (entry->hi == newhi))
                                break;
                }
                if (entry == start + 0x7ff)
                        entry = start;
                else
                        entry++;
        }

        if (((entry->lo & 0xfffffff8) != (newlo & 0xfffffff8)) &&
                (entry->hi != newhi) && del)
                return 0;

        if (i == HOP_NUMBER) {
                if (!del) {
                        printf("ARMD100 FEC: (%s) table section is full\n",
                                        __func__);
                        return -ENOSPC;
                } else {
                        return 0;
                }
        }

        /*
         * Update the selected entry
         */
        if (del) {
                entry->hi = 0;
                entry->lo = 0;
        } else {
                entry->hi = newhi;
                entry->lo = newlo;
        }

        return 0;
}

/*
 *  Create an addressTable entry from MAC address info
 *  found in the specifed net_device struct
 *
 *  Input : pointer to ethernet interface network device structure
 *  Output : N/A
 */
static void update_hash_table_mac_address(struct armdfec_device *darmdfec,
                                          u8 *oaddr, u8 *addr)
{
        u32 mach;
        u32 macl;

        /* Delete old entry */
        if (oaddr) {
                mach = (oaddr[0] << 8) | oaddr[1];
                macl = (oaddr[2] << 24) | (oaddr[3] << 16) |
                        (oaddr[4] << 8) | oaddr[5];
                add_del_hash_entry(darmdfec, mach, macl, 1, 0, HASH_DELETE);
        }

        /* Add new entry */
        mach = (addr[0] << 8) | addr[1];
        macl = (addr[2] << 24) | (addr[3] << 16) | (addr[4] << 8) | addr[5];
        add_del_hash_entry(darmdfec, mach, macl, 1, 0, HASH_ADD);
}

/* Address Table Initialization */
static void init_hashtable(struct eth_device *dev)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;
        memset(darmdfec->htpr, 0, HASH_ADDR_TABLE_SIZE);
        writel((u32)darmdfec->htpr, &regs->htpr);
}

/*
 * This detects PHY chip from address 0-31 by reading PHY status
 * registers. PHY chip can be connected at any of this address.
 */
static int ethernet_phy_detect(struct eth_device *dev)
{
        u32 val;
        u16 tmp, mii_status;
        u8 addr;

        for (addr = 0; addr < 32; addr++) {
                if (miiphy_read(dev->name, addr, MII_BMSR, &mii_status) != 0)
                        /* try next phy */
                        continue;

                /* invalid MII status. More validation required here... */
                if (mii_status == 0 || mii_status == 0xffff)
                        /* try next phy */
                        continue;

                if (miiphy_read(dev->name, addr, MII_PHYSID1, &tmp) != 0)
                        /* try next phy */
                        continue;

                val = tmp << 16;
                if (miiphy_read(dev->name, addr, MII_PHYSID2, &tmp) != 0)
                        /* try next phy */
                        continue;

                val |= tmp;

                if ((val & 0xfffffff0) != 0)
                        return addr;
        }
        return -1;
}

static void armdfec_init_rx_desc_ring(struct armdfec_device *darmdfec)
{
        struct rx_desc *p_rx_desc;
        int i;

        /* initialize the Rx descriptors ring */
        p_rx_desc = darmdfec->p_rxdesc;
        for (i = 0; i < RINGSZ; i++) {
                p_rx_desc->cmd_sts = BUF_OWNED_BY_DMA | RX_EN_INT;
                p_rx_desc->buf_size = PKTSIZE_ALIGN;
                p_rx_desc->byte_cnt = 0;
                p_rx_desc->buf_ptr = darmdfec->p_rxbuf + i * PKTSIZE_ALIGN;
                if (i == (RINGSZ - 1)) {
                        p_rx_desc->nxtdesc_p = darmdfec->p_rxdesc;
                } else {
                        p_rx_desc->nxtdesc_p = (struct rx_desc *)
                            ((u32)p_rx_desc + ARMDFEC_RXQ_DESC_ALIGNED_SIZE);
                        p_rx_desc = p_rx_desc->nxtdesc_p;
                }
        }
        darmdfec->p_rxdesc_curr = darmdfec->p_rxdesc;
}

static int armdfec_init(struct eth_device *dev, struct bd_info *bd)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;
        int phy_adr;
        u32 temp;

        armdfec_init_rx_desc_ring(darmdfec);

        /* Disable interrupts */
        writel(0, &regs->im);
        writel(0, &regs->ic);
        /* Write to ICR to clear interrupts. */
        writel(0, &regs->iwc);

        /*
         * Abort any transmit and receive operations and put DMA
         * in idle state.
         */
        abortdma(dev);

        /* Initialize address hash table */
        init_hashtable(dev);

        /* SDMA configuration */
        writel(SDCR_BSZ8 |      /* Burst size = 32 bytes */
                SDCR_RIFB |     /* Rx interrupt on frame */
                SDCR_BLMT |     /* Little endian transmit */
                SDCR_BLMR |     /* Little endian receive */
                SDCR_RC_MAX_RETRANS,    /* Max retransmit count */
                &regs->sdma_conf);
        /* Port Configuration */
        writel(PCR_HS, &regs->pconf);   /* Hash size is 1/2kb */

        /* Set extended port configuration */
        writel(PCXR_2BSM |              /* Two byte suffix aligns IP hdr */
                PCXR_DSCP_EN |          /* Enable DSCP in IP */
                PCXR_MFL_1536 |         /* Set MTU = 1536 */
                PCXR_FLP |              /* do not force link pass */
                PCXR_TX_HIGH_PRI,       /* Transmit - high priority queue */
                &regs->pconf_ext);

        update_hash_table_mac_address(darmdfec, NULL, dev->enetaddr);

        /* Update TX and RX queue descriptor register */
        temp = (u32)&regs->txcdp[TXQ];
        writel((u32)darmdfec->p_txdesc, temp);
        temp = (u32)&regs->rxfdp[RXQ];
        writel((u32)darmdfec->p_rxdesc, temp);
        temp = (u32)&regs->rxcdp[RXQ];
        writel((u32)darmdfec->p_rxdesc_curr, temp);

        /* Enable Interrupts */
        writel(ALL_INTS, &regs->im);

        /* Enable Ethernet Port */
        setbits_le32(&regs->pconf, PCR_EN);

        /* Enable RX DMA engine */
        setbits_le32(&regs->sdma_cmd, SDMA_CMD_ERD);

#ifdef DEBUG
        eth_dump_regs(dev);
#endif

#if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII))

#if defined(CONFIG_PHY_BASE_ADR)
        miiphy_write(dev->name, PHY_ADR_REQ, PHY_ADR_REQ, CONFIG_PHY_BASE_ADR);
#else
        /* Search phy address from range 0-31 */
        phy_adr = ethernet_phy_detect(dev);
        if (phy_adr < 0) {
                printf("ARMD100 FEC: PHY not detected at address range 0-31\n");
                return -1;
        } else {
                debug("ARMD100 FEC: PHY detected at addr %d\n", phy_adr);
                miiphy_write(dev->name, PHY_ADR_REQ, PHY_ADR_REQ, phy_adr);
        }
#endif

#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)
        /* Wait up to 5s for the link status */
        for (i = 0; i < 5; i++) {
                u16 phy_adr;

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

        printf("ARMD100 FEC: No link on %s\n", dev->name);
        return -1;
#endif
#endif
        return 0;
}

static void armdfec_halt(struct eth_device *dev)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;

        /* Stop RX DMA */
        clrbits_le32(&regs->sdma_cmd, SDMA_CMD_ERD);

        /*
         * Abort any transmit and receive operations and put DMA
         * in idle state.
         */
        abortdma(dev);

        /* Disable interrupts */
        writel(0, &regs->im);
        writel(0, &regs->ic);
        writel(0, &regs->iwc);

        /* Disable Port */
        clrbits_le32(&regs->pconf, PCR_EN);
}

static int armdfec_send(struct eth_device *dev, void *dataptr, int datasize)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct armdfec_reg *regs = darmdfec->regs;
        struct tx_desc *p_txdesc = darmdfec->p_txdesc;
        void *p = (void *)dataptr;
        int retry = PHY_WAIT_ITERATIONS * PHY_WAIT_MICRO_SECONDS;
        u32 cmd_sts, temp;

        /* Copy buffer if it's misaligned */
        if ((u32)dataptr & 0x07) {
                if (datasize > PKTSIZE_ALIGN) {
                        printf("ARMD100 FEC: Non-aligned data too large (%d)\n",
                                        datasize);
                        return -1;
                }
                memcpy(darmdfec->p_aligned_txbuf, p, datasize);
                p = darmdfec->p_aligned_txbuf;
        }

        p_txdesc->cmd_sts = TX_ZERO_PADDING | TX_GEN_CRC;
        p_txdesc->cmd_sts |= TX_FIRST_DESC | TX_LAST_DESC;
        p_txdesc->cmd_sts |= BUF_OWNED_BY_DMA;
        p_txdesc->cmd_sts |= TX_EN_INT;
        p_txdesc->buf_ptr = p;
        p_txdesc->byte_cnt = datasize;

        /* Apply send command using high priority TX queue */
        temp = (u32)&regs->txcdp[TXQ];
        writel((u32)p_txdesc, temp);
        writel(SDMA_CMD_TXDL | SDMA_CMD_TXDH | SDMA_CMD_ERD, &regs->sdma_cmd);

        /*
         * wait for packet xmit completion
         */
        cmd_sts = readl(&p_txdesc->cmd_sts);
        while (cmd_sts & BUF_OWNED_BY_DMA) {
                /* return fail if error is detected */
                if ((cmd_sts & (TX_ERROR | TX_LAST_DESC)) ==
                        (TX_ERROR | TX_LAST_DESC)) {
                        printf("ARMD100 FEC: (%s) in xmit packet\n", __func__);
                        return -1;
                }
                cmd_sts = readl(&p_txdesc->cmd_sts);
                if (!(retry--)) {
                        printf("ARMD100 FEC: (%s) xmit packet timeout!\n",
                                        __func__);
                        return -1;
                }
        }

        return 0;
}

static int armdfec_recv(struct eth_device *dev)
{
        struct armdfec_device *darmdfec = to_darmdfec(dev);
        struct rx_desc *p_rxdesc_curr = darmdfec->p_rxdesc_curr;
        u32 cmd_sts;
        u32 timeout = 0;
        u32 temp;

        /* wait untill rx packet available or timeout */
        do {
                if (timeout < PHY_WAIT_ITERATIONS * PHY_WAIT_MICRO_SECONDS) {
                        timeout++;
                } else {
                        debug("ARMD100 FEC: %s time out...\n", __func__);
                        return -1;
                }
        } while (readl(&p_rxdesc_curr->cmd_sts) & BUF_OWNED_BY_DMA);

        if (p_rxdesc_curr->byte_cnt != 0) {
                debug("ARMD100 FEC: %s: Received %d byte Packet @ 0x%x"
                                "(cmd_sts= %08x)\n", __func__,
                                (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 & (RX_FIRST_DESC | RX_LAST_DESC)) !=
                        (RX_FIRST_DESC | RX_LAST_DESC)) {
                printf("ARMD100 FEC: (%s) Dropping packet spread on"
                        " multiple descriptors\n", __func__);
        } else if (cmd_sts & RX_ERROR) {
                printf("ARMD100 FEC: (%s) Dropping packet with errors\n",
                                __func__);
        } else {
                /* !!! call higher layer processing */
                debug("ARMD100 FEC: (%s) Sending Received packet to"
                      " upper layer (net_process_received_packet)\n", __func__);

                /*
                 * let the upper layer handle the packet, subtract offset
                 * as two dummy bytes are added in received buffer see
                 * PORT_CONFIG_EXT register bit TWO_Byte_Stuff_Mode bit.
                 */
                net_process_received_packet(
                        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 = BUF_OWNED_BY_DMA | RX_EN_INT;
        p_rxdesc_curr->buf_size = PKTSIZE_ALIGN;
        p_rxdesc_curr->byte_cnt = 0;

        temp = (u32)&darmdfec->p_rxdesc_curr;
        writel((u32)p_rxdesc_curr->nxtdesc_p, temp);

        return 0;
}

int armada100_fec_register(unsigned long base_addr)
{
        struct armdfec_device *darmdfec;
        struct eth_device *dev;

        darmdfec = malloc(sizeof(struct armdfec_device));
        if (!darmdfec)
                goto error;

        memset(darmdfec, 0, sizeof(struct armdfec_device));

        darmdfec->htpr = memalign(8, HASH_ADDR_TABLE_SIZE);
        if (!darmdfec->htpr)
                goto error1;

        darmdfec->p_rxdesc = memalign(PKTALIGN,
                        ARMDFEC_RXQ_DESC_ALIGNED_SIZE * RINGSZ + 1);

        if (!darmdfec->p_rxdesc)
                goto error1;

        darmdfec->p_rxbuf = memalign(PKTALIGN, RINGSZ * PKTSIZE_ALIGN + 1);
        if (!darmdfec->p_rxbuf)
                goto error1;

        darmdfec->p_aligned_txbuf = memalign(8, PKTSIZE_ALIGN);
        if (!darmdfec->p_aligned_txbuf)
                goto error1;

        darmdfec->p_txdesc = memalign(PKTALIGN, sizeof(struct tx_desc) + 1);
        if (!darmdfec->p_txdesc)
                goto error1;

        dev = &darmdfec->dev;
        /* Assign ARMADA100 Fast Ethernet Controller Base Address */
        darmdfec->regs = (void *)base_addr;

        /* must be less than sizeof(dev->name) */
        strcpy(dev->name, "armd-fec0");

        dev->init = armdfec_init;
        dev->halt = armdfec_halt;
        dev->send = armdfec_send;
        dev->recv = armdfec_recv;

        eth_register(dev);

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
        int retval;
        struct mii_dev *mdiodev = mdio_alloc();
        if (!mdiodev)
                return -ENOMEM;
        strlcpy(mdiodev->name, dev->name, MDIO_NAME_LEN);
        mdiodev->read = smi_reg_read;
        mdiodev->write = smi_reg_write;

        retval = mdio_register(mdiodev);
        if (retval < 0)
                return retval;
#endif
        return 0;

error1:
        free(darmdfec->p_aligned_txbuf);
        free(darmdfec->p_rxbuf);
        free(darmdfec->p_rxdesc);
        free(darmdfec->htpr);
error:
        free(darmdfec);
        printf("AMD100 FEC: (%s) Failed to allocate memory\n", __func__);
        return -1;
}