// SPDX-License-Identifier: GPL-2.0+
/*
 * (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
 */

#include <common.h>
#include <dm.h>
#include <log.h>
#include <net.h>
#include <malloc.h>
#include <miiphy.h>
#include <wait_bit.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <asm/types.h>
#include <asm/system.h>
#include <asm/byteorder.h>
#include <asm/arch/cpu.h>

#if defined(CONFIG_ARCH_KIRKWOOD)
#include <asm/arch/soc.h>
#elif defined(CONFIG_ARCH_ORION5X)
#include <asm/arch/orion5x.h>
#endif

#include "mvgbe.h"

DECLARE_GLOBAL_DATA_PTR;

#ifndef CONFIG_MVGBE_PORTS
# define CONFIG_MVGBE_PORTS {0, 0}
#endif

#define MV_PHY_ADR_REQUEST 0xee
#define MVGBE_SMI_REG (((struct mvgbe_registers *)MVGBE0_BASE)->smi)

#if defined(CONFIG_PHYLIB) || defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
static int smi_wait_ready(struct mvgbe_device *dmvgbe)
{
        int ret;

        ret = wait_for_bit_le32(&MVGBE_SMI_REG, MVGBE_PHY_SMI_BUSY_MASK, false,
                                MVGBE_PHY_SMI_TIMEOUT_MS, false);
        if (ret) {
                printf("Error: SMI busy timeout\n");
                return ret;
        }

        return 0;
}

static int __mvgbe_mdio_read(struct mvgbe_device *dmvgbe, int phy_adr,
                             int devad, int reg_ofs)
{
        struct mvgbe_registers *regs = dmvgbe->regs;
        u32 smi_reg;
        u32 timeout;
        u16 data = 0;

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

        /* wait till the SMI is not busy */
        if (smi_wait_ready(dmvgbe) < 0)
                return -EFAULT;

        /* fill the phy address and regiser offset and read opcode */
        smi_reg = (phy_adr << MVGBE_PHY_SMI_DEV_ADDR_OFFS)
                | (reg_ofs << MVGBE_SMI_REG_ADDR_OFFS)
                | MVGBE_PHY_SMI_OPCODE_READ;

        /* write the smi register */
        MVGBE_REG_WR(MVGBE_SMI_REG, smi_reg);

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

        do {
                /* read smi register */
                smi_reg = MVGBE_REG_RD(MVGBE_SMI_REG);
                if (timeout-- == 0) {
                        printf("Err..(%s) SMI read ready timeout\n",
                                __func__);
                        return -EFAULT;
                }
        } while (!(smi_reg & MVGBE_PHY_SMI_READ_VALID_MASK));

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

        data = (u16) (MVGBE_REG_RD(MVGBE_SMI_REG) & MVGBE_PHY_SMI_DATA_MASK);

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

        return data;
}

/*
 * smi_reg_read - miiphy_read callback function.
 *
 * Returns 16bit phy register value, or -EFAULT on error
 */
static int smi_reg_read(struct mii_dev *bus, int phy_adr, int devad,
                        int reg_ofs)
{
#ifdef CONFIG_DM_ETH
        struct mvgbe_device *dmvgbe = bus->priv;
#else
        struct eth_device *dev = eth_get_dev_by_name(bus->name);
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);
#endif

        return __mvgbe_mdio_read(dmvgbe, phy_adr, devad, reg_ofs);
}

static int __mvgbe_mdio_write(struct mvgbe_device *dmvgbe, int phy_adr,
                              int devad, int reg_ofs, u16 data)
{
        struct mvgbe_registers *regs = dmvgbe->regs;
        u32 smi_reg;

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

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

        /* wait till the SMI is not busy */
        if (smi_wait_ready(dmvgbe) < 0)
                return -EFAULT;

        /* fill the phy addr and reg offset and write opcode and data */
        smi_reg = (data << MVGBE_PHY_SMI_DATA_OFFS);
        smi_reg |= (phy_adr << MVGBE_PHY_SMI_DEV_ADDR_OFFS)
                | (reg_ofs << MVGBE_SMI_REG_ADDR_OFFS);
        smi_reg &= ~MVGBE_PHY_SMI_OPCODE_READ;

        /* write the smi register */
        MVGBE_REG_WR(MVGBE_SMI_REG, smi_reg);

        return 0;
}

/*
 * smi_reg_write - miiphy_write callback function.
 *
 * Returns 0 if write succeed, -EFAULT on error
 */
static int smi_reg_write(struct mii_dev *bus, int phy_adr, int devad,
                         int reg_ofs, u16 data)
{
#ifdef CONFIG_DM_ETH
        struct mvgbe_device *dmvgbe = bus->priv;
#else
        struct eth_device *dev = eth_get_dev_by_name(bus->name);
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);
#endif

        return __mvgbe_mdio_write(dmvgbe, phy_adr, devad, reg_ofs, data);
}
#endif

/* 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 mvgbe_registers *regs,
                                struct mvgbe_winparam *param)
{
        u32 access_prot_reg;

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

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

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

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

static void set_dram_access(struct mvgbe_registers *regs)
{
        struct mvgbe_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 = MVGBE_TARGET_DRAM;
                /* Enable full access */
                win_param.access_ctrl = EWIN_ACCESS_FULL;
                win_param.high_addr = 0;
                /* Get bank base and size */
                win_param.base_addr = gd->bd->bi_dram[i].start;
                win_param.size = gd->bd->bi_dram[i].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:
                        /* invalid 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 mvgbe_registers *regs)
{
        int table_index;

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

        for (table_index = 0; table_index < 64; ++table_index) {
                /* Clear DA filter special multicast table (Ex_dFSMT) */
                MVGBE_REG_WR(regs->dfsmt[table_index], 0);
                /* Clear DA filter other multicast table (Ex_dFOMT) */
                MVGBE_REG_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 mvgbe_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 = MVGBE_REG_RD(regs->dfut[tbl_offset]);
                unicast_reg &= (0xFF << (8 * reg_offset));
                MVGBE_REG_WR(regs->dfut[tbl_offset], unicast_reg);
                break;
        case ACCEPT_MAC_ADDR:
                /* Set accepts frame bit at unicast DA filter table entry */
                unicast_reg = MVGBE_REG_RD(regs->dfut[tbl_offset]);
                unicast_reg &= (0xFF << (8 * reg_offset));
                unicast_reg |= ((0x01 | (RXUQ << 1)) << (8 * reg_offset));
                MVGBE_REG_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 mvgbe_device *dmvgbe, u8 *p_addr)
{
        struct mvgbe_registers *regs = dmvgbe->regs;
        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);

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

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

/*
 * mvgbe_init_rx_desc_ring - Curve a Rx chain desc list and buffer in memory.
 */
static void mvgbe_init_rx_desc_ring(struct mvgbe_device *dmvgbe)
{
        struct mvgbe_rxdesc *p_rx_desc;
        int i;

        /* initialize the Rx descriptors ring */
        p_rx_desc = dmvgbe->p_rxdesc;
        for (i = 0; i < RINGSZ; i++) {
                p_rx_desc->cmd_sts =
                        MVGBE_BUFFER_OWNED_BY_DMA | MVGBE_RX_EN_INTERRUPT;
                p_rx_desc->buf_size = PKTSIZE_ALIGN;
                p_rx_desc->byte_cnt = 0;
                p_rx_desc->buf_ptr = dmvgbe->p_rxbuf + i * PKTSIZE_ALIGN;
                if (i == (RINGSZ - 1))
                        p_rx_desc->nxtdesc_p = dmvgbe->p_rxdesc;
                else {
                        p_rx_desc->nxtdesc_p = (struct mvgbe_rxdesc *)
                                ((u32) p_rx_desc + MV_RXQ_DESC_ALIGNED_SIZE);
                        p_rx_desc = p_rx_desc->nxtdesc_p;
                }
        }
        dmvgbe->p_rxdesc_curr = dmvgbe->p_rxdesc;
}

static int __mvgbe_init(struct mvgbe_device *dmvgbe, u8 *enetaddr,
                        const char *name)
{
        struct mvgbe_registers *regs = dmvgbe->regs;
#if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII)) &&  \
        !defined(CONFIG_PHYLIB) &&                       \
        !defined(CONFIG_DM_ETH) &&                       \
        defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)
        int i;
#endif
        /* setup RX rings */
        mvgbe_init_rx_desc_ring(dmvgbe);

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

        set_dram_access(regs);
        port_init_mac_tables(regs);
        port_uc_addr_set(dmvgbe, enetaddr);

        /* Assign port configuration and command. */
        MVGBE_REG_WR(regs->pxc, PRT_CFG_VAL);
        MVGBE_REG_WR(regs->pxcx, PORT_CFG_EXTEND_VALUE);
        MVGBE_REG_WR(regs->psc0, PORT_SERIAL_CONTROL_VALUE);

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

        /* Set maximum receive buffer to 9700 bytes */
        MVGBE_REG_WR(regs->psc0, MVGBE_MAX_RX_PACKET_9700BYTE
                        | (MVGBE_REG_RD(regs->psc0) & MRU_MASK));

        /* Enable port initially */
        MVGBE_REG_BITS_SET(regs->psc0, MVGBE_SERIAL_PORT_EN);

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

        /* Assignment of Rx CRDB of given RXUQ */
        MVGBE_REG_WR(regs->rxcdp[RXUQ], (u32) dmvgbe->p_rxdesc_curr);
        /* ensure previous write is done before enabling Rx DMA */
        isb();
        /* Enable port Rx. */
        MVGBE_REG_WR(regs->rqc, (1 << RXUQ));

#if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII)) && \
        !defined(CONFIG_PHYLIB) && \
        !defined(CONFIG_DM_ETH) && \
        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(name, MV_PHY_ADR_REQUEST,
                                MV_PHY_ADR_REQUEST, &phyadr);
                /* Return if we get link up */
                if (miiphy_link(name, phyadr))
                        return 0;
                udelay(1000000);
        }

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

#ifndef CONFIG_DM_ETH
static int mvgbe_init(struct eth_device *dev)
{
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);

        return __mvgbe_init(dmvgbe, dmvgbe->dev.enetaddr, dmvgbe->dev.name);
}
#endif

static void __mvgbe_halt(struct mvgbe_device *dmvgbe)
{
        struct mvgbe_registers *regs = dmvgbe->regs;

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

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

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

#ifndef CONFIG_DM_ETH
static int mvgbe_halt(struct eth_device *dev)
{
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);

        __mvgbe_halt(dmvgbe);

        return 0;
}
#endif

#ifdef CONFIG_DM_ETH
static int mvgbe_write_hwaddr(struct udevice *dev)
{
        struct eth_pdata *pdata = dev_get_plat(dev);

        port_uc_addr_set(dev_get_priv(dev), pdata->enetaddr);

        return 0;
}
#else
static int mvgbe_write_hwaddr(struct eth_device *dev)
{
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);

        /* Programs net device MAC address after initialization */
        port_uc_addr_set(dmvgbe, dmvgbe->dev.enetaddr);
        return 0;
}
#endif

static int __mvgbe_send(struct mvgbe_device *dmvgbe, void *dataptr,
                        int datasize)
{
        struct mvgbe_registers *regs = dmvgbe->regs;
        struct mvgbe_txdesc *p_txdesc = dmvgbe->p_txdesc;
        void *p = (void *)dataptr;
        u32 cmd_sts;
        u32 txuq0_reg_addr;

        /* 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(dmvgbe->p_aligned_txbuf, p, datasize);
                p = dmvgbe->p_aligned_txbuf;
        }

        p_txdesc->cmd_sts = MVGBE_ZERO_PADDING | MVGBE_GEN_CRC;
        p_txdesc->cmd_sts |= MVGBE_TX_FIRST_DESC | MVGBE_TX_LAST_DESC;
        p_txdesc->cmd_sts |= MVGBE_BUFFER_OWNED_BY_DMA;
        p_txdesc->cmd_sts |= MVGBE_TX_EN_INTERRUPT;
        p_txdesc->buf_ptr = (u8 *) p;
        p_txdesc->byte_cnt = datasize;

        /* Set this tc desc as zeroth TXUQ */
        txuq0_reg_addr = (u32)&regs->tcqdp[TXUQ];
        writel((u32) p_txdesc, txuq0_reg_addr);

        /* ensure tx desc writes above are performed before we start Tx DMA */
        isb();

        /* Apply send command using zeroth TXUQ */
        MVGBE_REG_WR(regs->tqc, (1 << TXUQ));

        /*
         * wait for packet xmit completion
         */
        cmd_sts = readl(&p_txdesc->cmd_sts);
        while (cmd_sts & MVGBE_BUFFER_OWNED_BY_DMA) {
                /* return fail if error is detected */
                if ((cmd_sts & (MVGBE_ERROR_SUMMARY | MVGBE_TX_LAST_FRAME)) ==
                                (MVGBE_ERROR_SUMMARY | MVGBE_TX_LAST_FRAME) &&
                                cmd_sts & (MVGBE_UR_ERROR | MVGBE_RL_ERROR)) {
                        printf("Err..(%s) in xmit packet\n", __func__);
                        return -1;
                }
                cmd_sts = readl(&p_txdesc->cmd_sts);
        };
        return 0;
}

#ifndef CONFIG_DM_ETH
static int mvgbe_send(struct eth_device *dev, void *dataptr, int datasize)
{
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);

        return __mvgbe_send(dmvgbe, dataptr, datasize);
}
#endif

static int __mvgbe_recv(struct mvgbe_device *dmvgbe, uchar **packetp)
{
        struct mvgbe_rxdesc *p_rxdesc_curr = dmvgbe->p_rxdesc_curr;
        u32 cmd_sts;
        u32 timeout = 0;
        u32 rxdesc_curr_addr;
        unsigned char *data;
        int rx_bytes = 0;

        *packetp = NULL;

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

        if (p_rxdesc_curr->byte_cnt != 0) {
                debug("%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 &
                (MVGBE_RX_FIRST_DESC | MVGBE_RX_LAST_DESC))
                != (MVGBE_RX_FIRST_DESC | MVGBE_RX_LAST_DESC)) {

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

        } else if (cmd_sts & MVGBE_ERROR_SUMMARY) {

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

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

                data = (p_rxdesc_curr->buf_ptr + RX_BUF_OFFSET);
                rx_bytes = (int)(p_rxdesc_curr->byte_cnt -
                                                  RX_BUF_OFFSET);

                *packetp = data;
        }
        /*
         * free these descriptors and point next in the ring
         */
        p_rxdesc_curr->cmd_sts =
                MVGBE_BUFFER_OWNED_BY_DMA | MVGBE_RX_EN_INTERRUPT;
        p_rxdesc_curr->buf_size = PKTSIZE_ALIGN;
        p_rxdesc_curr->byte_cnt = 0;

        rxdesc_curr_addr = (u32)&dmvgbe->p_rxdesc_curr;
        writel((unsigned)p_rxdesc_curr->nxtdesc_p, rxdesc_curr_addr);

        return rx_bytes;
}

#ifndef CONFIG_DM_ETH
static int mvgbe_recv(struct eth_device *dev)
{
        struct mvgbe_device *dmvgbe = to_mvgbe(dev);
        uchar *packet;
        int ret;

        ret = __mvgbe_recv(dmvgbe, &packet);
        if (ret < 0)
                return ret;

        net_process_received_packet(packet, ret);

        return 0;
}
#endif

#if defined(CONFIG_PHYLIB) || defined(CONFIG_DM_ETH)
#if defined(CONFIG_DM_ETH)
static struct phy_device *__mvgbe_phy_init(struct udevice *dev,
                                           struct mii_dev *bus,
                                           phy_interface_t phy_interface,
                                           int phyid)
#else
static struct phy_device *__mvgbe_phy_init(struct eth_device *dev,
                                           struct mii_dev *bus,
                                           phy_interface_t phy_interface,
                                           int phyid)
#endif
{
        struct phy_device *phydev;

        /* Set phy address of the port */
        miiphy_write(dev->name, MV_PHY_ADR_REQUEST, MV_PHY_ADR_REQUEST,
                     phyid);

        phydev = phy_connect(bus, phyid, dev, phy_interface);
        if (!phydev) {
                printf("phy_connect failed\n");
                return NULL;
        }

        phy_config(phydev);
        phy_startup(phydev);

        return phydev;
}
#endif /* CONFIG_PHYLIB || CONFIG_DM_ETH */

#if defined(CONFIG_PHYLIB) && !defined(CONFIG_DM_ETH)
int mvgbe_phylib_init(struct eth_device *dev, int phyid)
{
        struct mii_dev *bus;
        struct phy_device *phydev;
        int ret;

        bus = mdio_alloc();
        if (!bus) {
                printf("mdio_alloc failed\n");
                return -ENOMEM;
        }
        bus->read = smi_reg_read;
        bus->write = smi_reg_write;
        strcpy(bus->name, dev->name);

        ret = mdio_register(bus);
        if (ret) {
                printf("mdio_register failed\n");
                free(bus);
                return -ENOMEM;
        }

        phydev = __mvgbe_phy_init(dev, bus, PHY_INTERFACE_MODE_RGMII, phyid);
        if (!phydev)
                return -ENODEV;

        return 0;
}
#endif

static int mvgbe_alloc_buffers(struct mvgbe_device *dmvgbe)
{
        dmvgbe->p_rxdesc = memalign(PKTALIGN,
                                    MV_RXQ_DESC_ALIGNED_SIZE * RINGSZ + 1);
        if (!dmvgbe->p_rxdesc)
                goto error1;

        dmvgbe->p_rxbuf = memalign(PKTALIGN,
                                   RINGSZ * PKTSIZE_ALIGN + 1);
        if (!dmvgbe->p_rxbuf)
                goto error2;

        dmvgbe->p_aligned_txbuf = memalign(8, PKTSIZE_ALIGN);
        if (!dmvgbe->p_aligned_txbuf)
                goto error3;

        dmvgbe->p_txdesc = memalign(PKTALIGN, sizeof(struct mvgbe_txdesc) + 1);
        if (!dmvgbe->p_txdesc)
                goto error4;

        return 0;

error4:
        free(dmvgbe->p_aligned_txbuf);
error3:
        free(dmvgbe->p_rxbuf);
error2:
        free(dmvgbe->p_rxdesc);
error1:
        return -ENOMEM;
}

#ifndef CONFIG_DM_ETH
int mvgbe_initialize(struct bd_info *bis)
{
        struct mvgbe_device *dmvgbe;
        struct eth_device *dev;
        int devnum;
        int ret;
        u8 used_ports[MAX_MVGBE_DEVS] = CONFIG_MVGBE_PORTS;

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

                dmvgbe = malloc(sizeof(struct mvgbe_device));
                if (!dmvgbe)
                        return -ENOMEM;

                memset(dmvgbe, 0, sizeof(struct mvgbe_device));
                ret = mvgbe_alloc_buffers(dmvgbe);
                if (ret) {
                        printf("Err.. %s Failed to allocate memory\n",
                                __func__);
                        free(dmvgbe);
                        return ret;
                }

                dev = &dmvgbe->dev;

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

                switch (devnum) {
                case 0:
                        dmvgbe->regs = (void *)MVGBE0_BASE;
                        break;
#if defined(MVGBE1_BASE)
                case 1:
                        dmvgbe->regs = (void *)MVGBE1_BASE;
                        break;
#endif
                default:        /* this should never happen */
                        printf("Err..(%s) Invalid device number %d\n",
                                __func__, devnum);
                        return -1;
                }

                dev->init = (void *)mvgbe_init;
                dev->halt = (void *)mvgbe_halt;
                dev->send = (void *)mvgbe_send;
                dev->recv = (void *)mvgbe_recv;
                dev->write_hwaddr = (void *)mvgbe_write_hwaddr;

                eth_register(dev);

#if defined(CONFIG_PHYLIB)
                mvgbe_phylib_init(dev, PHY_BASE_ADR + devnum);
#elif 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;
                /* Set phy address of the port */
                miiphy_write(dev->name, MV_PHY_ADR_REQUEST,
                                MV_PHY_ADR_REQUEST, PHY_BASE_ADR + devnum);
#endif
        }
        return 0;
}
#endif

#ifdef CONFIG_DM_ETH
static int mvgbe_port_is_fixed_link(struct mvgbe_device *dmvgbe)
{
        return dmvgbe->phyaddr > PHY_MAX_ADDR;
}

static int mvgbe_start(struct udevice *dev)
{
        struct eth_pdata *pdata = dev_get_plat(dev);
        struct mvgbe_device *dmvgbe = dev_get_priv(dev);
        int ret;

        ret = __mvgbe_init(dmvgbe, pdata->enetaddr, dev->name);
        if (ret)
                return ret;

        if (!mvgbe_port_is_fixed_link(dmvgbe)) {
                dmvgbe->phydev = __mvgbe_phy_init(dev, dmvgbe->bus,
                                                  dmvgbe->phy_interface,
                                                  dmvgbe->phyaddr);
                if (!dmvgbe->phydev)
                        return -ENODEV;
        }

        return 0;
}

static int mvgbe_send(struct udevice *dev, void *packet, int length)
{
        struct mvgbe_device *dmvgbe = dev_get_priv(dev);

        return __mvgbe_send(dmvgbe, packet, length);
}

static int mvgbe_recv(struct udevice *dev, int flags, uchar **packetp)
{
        struct mvgbe_device *dmvgbe = dev_get_priv(dev);

        return __mvgbe_recv(dmvgbe, packetp);
}

static void mvgbe_stop(struct udevice *dev)
{
        struct mvgbe_device *dmvgbe = dev_get_priv(dev);

        __mvgbe_halt(dmvgbe);
}

static int mvgbe_probe(struct udevice *dev)
{
        struct eth_pdata *pdata = dev_get_plat(dev);
        struct mvgbe_device *dmvgbe = dev_get_priv(dev);
        struct mii_dev *bus;
        int ret;

        ret = mvgbe_alloc_buffers(dmvgbe);
        if (ret)
                return ret;

        dmvgbe->regs = (void __iomem *)pdata->iobase;

        bus  = mdio_alloc();
        if (!bus) {
                printf("Failed to allocate MDIO bus\n");
                return -ENOMEM;
        }

        bus->read = smi_reg_read;
        bus->write = smi_reg_write;
        snprintf(bus->name, sizeof(bus->name), dev->name);
        bus->priv = dmvgbe;
        dmvgbe->bus = bus;

        ret = mdio_register(bus);
        if (ret < 0)
                return ret;

        return 0;
}

static const struct eth_ops mvgbe_ops = {
        .start          = mvgbe_start,
        .send           = mvgbe_send,
        .recv           = mvgbe_recv,
        .stop           = mvgbe_stop,
        .write_hwaddr   = mvgbe_write_hwaddr,
};

static int mvgbe_of_to_plat(struct udevice *dev)
{
        struct eth_pdata *pdata = dev_get_plat(dev);
        struct mvgbe_device *dmvgbe = dev_get_priv(dev);
        void *blob = (void *)gd->fdt_blob;
        int node = dev_of_offset(dev);
        const char *phy_mode;
        int fl_node;
        int pnode;
        unsigned long addr;

        pdata->iobase = dev_read_addr(dev);
        pdata->phy_interface = -1;

        pnode = fdt_node_offset_by_compatible(blob, node,
                                              "marvell,kirkwood-eth-port");

        /* Get phy-mode / phy_interface from DT */
        phy_mode = fdt_getprop(gd->fdt_blob, pnode, "phy-mode", NULL);
        if (phy_mode)
                pdata->phy_interface = phy_get_interface_by_name(phy_mode);
        else
                pdata->phy_interface = PHY_INTERFACE_MODE_GMII;

        dmvgbe->phy_interface = pdata->phy_interface;

        /* fetch 'fixed-link' property */
        fl_node = fdt_subnode_offset(blob, pnode, "fixed-link");
        if (fl_node != -FDT_ERR_NOTFOUND) {
                /* set phy_addr to invalid value for fixed link */
                dmvgbe->phyaddr = PHY_MAX_ADDR + 1;
                dmvgbe->duplex = fdtdec_get_bool(blob, fl_node, "full-duplex");
                dmvgbe->speed = fdtdec_get_int(blob, fl_node, "speed", 0);
        } else {
                /* Now read phyaddr from DT */
                addr = fdtdec_lookup_phandle(blob, pnode, "phy-handle");
                if (addr > 0)
                        dmvgbe->phyaddr = fdtdec_get_int(blob, addr, "reg", 0);
        }

        return 0;
}

static const struct udevice_id mvgbe_ids[] = {
        { .compatible = "marvell,kirkwood-eth" },
        { }
};

U_BOOT_DRIVER(mvgbe) = {
        .name   = "mvgbe",
        .id     = UCLASS_ETH,
        .of_match = mvgbe_ids,
        .of_to_plat = mvgbe_of_to_plat,
        .probe  = mvgbe_probe,
        .ops    = &mvgbe_ops,
        .priv_auto      = sizeof(struct mvgbe_device),
        .plat_auto      = sizeof(struct eth_pdata),
};
#endif /* CONFIG_DM_ETH */