/*
 * Driver for BCM963xx builtin Ethernet mac
 *
 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/err.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/if_vlan.h>

#include <bcm63xx_dev_enet.h>
#include "bcm63xx_enet.h"

static char bcm_enet_driver_name[] = "bcm63xx_enet";
static char bcm_enet_driver_version[] = "1.0";

static int copybreak __read_mostly = 128;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");

/* io registers memory shared between all devices */
static void __iomem *bcm_enet_shared_base[3];

/*
 * io helpers to access mac registers
 */
static inline u32 enet_readl(struct bcm_enet_priv *priv, u32 off)
{
        return bcm_readl(priv->base + off);
}

static inline void enet_writel(struct bcm_enet_priv *priv,
                               u32 val, u32 off)
{
        bcm_writel(val, priv->base + off);
}

/*
 * io helpers to access switch registers
 */
static inline u32 enetsw_readl(struct bcm_enet_priv *priv, u32 off)
{
        return bcm_readl(priv->base + off);
}

static inline void enetsw_writel(struct bcm_enet_priv *priv,
                                 u32 val, u32 off)
{
        bcm_writel(val, priv->base + off);
}

static inline u16 enetsw_readw(struct bcm_enet_priv *priv, u32 off)
{
        return bcm_readw(priv->base + off);
}

static inline void enetsw_writew(struct bcm_enet_priv *priv,
                                 u16 val, u32 off)
{
        bcm_writew(val, priv->base + off);
}

static inline u8 enetsw_readb(struct bcm_enet_priv *priv, u32 off)
{
        return bcm_readb(priv->base + off);
}

static inline void enetsw_writeb(struct bcm_enet_priv *priv,
                                 u8 val, u32 off)
{
        bcm_writeb(val, priv->base + off);
}


/* io helpers to access shared registers */
static inline u32 enet_dma_readl(struct bcm_enet_priv *priv, u32 off)
{
        return bcm_readl(bcm_enet_shared_base[0] + off);
}

static inline void enet_dma_writel(struct bcm_enet_priv *priv,
                                       u32 val, u32 off)
{
        bcm_writel(val, bcm_enet_shared_base[0] + off);
}

static inline u32 enet_dmac_readl(struct bcm_enet_priv *priv, u32 off, int chan)
{
        return bcm_readl(bcm_enet_shared_base[1] +
                bcm63xx_enetdmacreg(off) + chan * priv->dma_chan_width);
}

static inline void enet_dmac_writel(struct bcm_enet_priv *priv,
                                       u32 val, u32 off, int chan)
{
        bcm_writel(val, bcm_enet_shared_base[1] +
                bcm63xx_enetdmacreg(off) + chan * priv->dma_chan_width);
}

static inline u32 enet_dmas_readl(struct bcm_enet_priv *priv, u32 off, int chan)
{
        return bcm_readl(bcm_enet_shared_base[2] + off + chan * priv->dma_chan_width);
}

static inline void enet_dmas_writel(struct bcm_enet_priv *priv,
                                       u32 val, u32 off, int chan)
{
        bcm_writel(val, bcm_enet_shared_base[2] + off + chan * priv->dma_chan_width);
}

/*
 * write given data into mii register and wait for transfer to end
 * with timeout (average measured transfer time is 25us)
 */
static int do_mdio_op(struct bcm_enet_priv *priv, unsigned int data)
{
        int limit;

        /* make sure mii interrupt status is cleared */
        enet_writel(priv, ENET_IR_MII, ENET_IR_REG);

        enet_writel(priv, data, ENET_MIIDATA_REG);
        wmb();

        /* busy wait on mii interrupt bit, with timeout */
        limit = 1000;
        do {
                if (enet_readl(priv, ENET_IR_REG) & ENET_IR_MII)
                        break;
                udelay(1);
        } while (limit-- > 0);

        return (limit < 0) ? 1 : 0;
}

/*
 * MII internal read callback
 */
static int bcm_enet_mdio_read(struct bcm_enet_priv *priv, int mii_id,
                              int regnum)
{
        u32 tmp, val;

        tmp = regnum << ENET_MIIDATA_REG_SHIFT;
        tmp |= 0x2 << ENET_MIIDATA_TA_SHIFT;
        tmp |= mii_id << ENET_MIIDATA_PHYID_SHIFT;
        tmp |= ENET_MIIDATA_OP_READ_MASK;

        if (do_mdio_op(priv, tmp))
                return -1;

        val = enet_readl(priv, ENET_MIIDATA_REG);
        val &= 0xffff;
        return val;
}

/*
 * MII internal write callback
 */
static int bcm_enet_mdio_write(struct bcm_enet_priv *priv, int mii_id,
                               int regnum, u16 value)
{
        u32 tmp;

        tmp = (value & 0xffff) << ENET_MIIDATA_DATA_SHIFT;
        tmp |= 0x2 << ENET_MIIDATA_TA_SHIFT;
        tmp |= regnum << ENET_MIIDATA_REG_SHIFT;
        tmp |= mii_id << ENET_MIIDATA_PHYID_SHIFT;
        tmp |= ENET_MIIDATA_OP_WRITE_MASK;

        (void)do_mdio_op(priv, tmp);
        return 0;
}

/*
 * MII read callback from phylib
 */
static int bcm_enet_mdio_read_phylib(struct mii_bus *bus, int mii_id,
                                     int regnum)
{
        return bcm_enet_mdio_read(bus->priv, mii_id, regnum);
}

/*
 * MII write callback from phylib
 */
static int bcm_enet_mdio_write_phylib(struct mii_bus *bus, int mii_id,
                                      int regnum, u16 value)
{
        return bcm_enet_mdio_write(bus->priv, mii_id, regnum, value);
}

/*
 * MII read callback from mii core
 */
static int bcm_enet_mdio_read_mii(struct net_device *dev, int mii_id,
                                  int regnum)
{
        return bcm_enet_mdio_read(netdev_priv(dev), mii_id, regnum);
}

/*
 * MII write callback from mii core
 */
static void bcm_enet_mdio_write_mii(struct net_device *dev, int mii_id,
                                    int regnum, int value)
{
        bcm_enet_mdio_write(netdev_priv(dev), mii_id, regnum, value);
}

/*
 * refill rx queue
 */
static int bcm_enet_refill_rx(struct net_device *dev)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);

        while (priv->rx_desc_count < priv->rx_ring_size) {
                struct bcm_enet_desc *desc;
                struct sk_buff *skb;
                dma_addr_t p;
                int desc_idx;
                u32 len_stat;

                desc_idx = priv->rx_dirty_desc;
                desc = &priv->rx_desc_cpu[desc_idx];

                if (!priv->rx_skb[desc_idx]) {
                        skb = netdev_alloc_skb(dev, priv->rx_skb_size);
                        if (!skb)
                                break;
                        priv->rx_skb[desc_idx] = skb;
                        p = dma_map_single(&priv->pdev->dev, skb->data,
                                           priv->rx_skb_size,
                                           DMA_FROM_DEVICE);
                        desc->address = p;
                }

                len_stat = priv->rx_skb_size << DMADESC_LENGTH_SHIFT;
                len_stat |= DMADESC_OWNER_MASK;
                if (priv->rx_dirty_desc == priv->rx_ring_size - 1) {
                        len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
                        priv->rx_dirty_desc = 0;
                } else {
                        priv->rx_dirty_desc++;
                }
                wmb();
                desc->len_stat = len_stat;

                priv->rx_desc_count++;

                /* tell dma engine we allocated one buffer */
                if (priv->dma_has_sram)
                        enet_dma_writel(priv, 1, ENETDMA_BUFALLOC_REG(priv->rx_chan));
                else
                        enet_dmac_writel(priv, 1, ENETDMAC_BUFALLOC, priv->rx_chan);
        }

        /* If rx ring is still empty, set a timer to try allocating
         * again at a later time. */
        if (priv->rx_desc_count == 0 && netif_running(dev)) {
                dev_warn(&priv->pdev->dev, "unable to refill rx ring\n");
                priv->rx_timeout.expires = jiffies + HZ;
                add_timer(&priv->rx_timeout);
        }

        return 0;
}

/*
 * timer callback to defer refill rx queue in case we're OOM
 */
static void bcm_enet_refill_rx_timer(unsigned long data)
{
        struct net_device *dev;
        struct bcm_enet_priv *priv;

        dev = (struct net_device *)data;
        priv = netdev_priv(dev);

        spin_lock(&priv->rx_lock);
        bcm_enet_refill_rx((struct net_device *)data);
        spin_unlock(&priv->rx_lock);
}

/*
 * extract packet from rx queue
 */
static int bcm_enet_receive_queue(struct net_device *dev, int budget)
{
        struct bcm_enet_priv *priv;
        struct device *kdev;
        int processed;

        priv = netdev_priv(dev);
        kdev = &priv->pdev->dev;
        processed = 0;

        /* don't scan ring further than number of refilled
         * descriptor */
        if (budget > priv->rx_desc_count)
                budget = priv->rx_desc_count;

        do {
                struct bcm_enet_desc *desc;
                struct sk_buff *skb;
                int desc_idx;
                u32 len_stat;
                unsigned int len;

                desc_idx = priv->rx_curr_desc;
                desc = &priv->rx_desc_cpu[desc_idx];

                /* make sure we actually read the descriptor status at
                 * each loop */
                rmb();

                len_stat = desc->len_stat;

                /* break if dma ownership belongs to hw */
                if (len_stat & DMADESC_OWNER_MASK)
                        break;

                processed++;
                priv->rx_curr_desc++;
                if (priv->rx_curr_desc == priv->rx_ring_size)
                        priv->rx_curr_desc = 0;
                priv->rx_desc_count--;

                /* if the packet does not have start of packet _and_
                 * end of packet flag set, then just recycle it */
                if ((len_stat & (DMADESC_ESOP_MASK >> priv->dma_desc_shift)) !=
                        (DMADESC_ESOP_MASK >> priv->dma_desc_shift)) {
                        dev->stats.rx_dropped++;
                        continue;
                }

                /* recycle packet if it's marked as bad */
                if (!priv->enet_is_sw &&
                    unlikely(len_stat & DMADESC_ERR_MASK)) {
                        dev->stats.rx_errors++;

                        if (len_stat & DMADESC_OVSIZE_MASK)
                                dev->stats.rx_length_errors++;
                        if (len_stat & DMADESC_CRC_MASK)
                                dev->stats.rx_crc_errors++;
                        if (len_stat & DMADESC_UNDER_MASK)
                                dev->stats.rx_frame_errors++;
                        if (len_stat & DMADESC_OV_MASK)
                                dev->stats.rx_fifo_errors++;
                        continue;
                }

                /* valid packet */
                skb = priv->rx_skb[desc_idx];
                len = (len_stat & DMADESC_LENGTH_MASK) >> DMADESC_LENGTH_SHIFT;
                /* don't include FCS */
                len -= 4;

                if (len < copybreak) {
                        struct sk_buff *nskb;

                        nskb = netdev_alloc_skb_ip_align(dev, len);
                        if (!nskb) {
                                /* forget packet, just rearm desc */
                                dev->stats.rx_dropped++;
                                continue;
                        }

                        dma_sync_single_for_cpu(kdev, desc->address,
                                                len, DMA_FROM_DEVICE);
                        memcpy(nskb->data, skb->data, len);
                        dma_sync_single_for_device(kdev, desc->address,
                                                   len, DMA_FROM_DEVICE);
                        skb = nskb;
                } else {
                        dma_unmap_single(&priv->pdev->dev, desc->address,
                                         priv->rx_skb_size, DMA_FROM_DEVICE);
                        priv->rx_skb[desc_idx] = NULL;
                }

                skb_put(skb, len);
                skb->protocol = eth_type_trans(skb, dev);
                dev->stats.rx_packets++;
                dev->stats.rx_bytes += len;
                netif_receive_skb(skb);

        } while (--budget > 0);

        if (processed || !priv->rx_desc_count) {
                bcm_enet_refill_rx(dev);

                /* kick rx dma */
                enet_dmac_writel(priv, priv->dma_chan_en_mask,
                                         ENETDMAC_CHANCFG, priv->rx_chan);
        }

        return processed;
}


/*
 * try to or force reclaim of transmitted buffers
 */
static int bcm_enet_tx_reclaim(struct net_device *dev, int force)
{
        struct bcm_enet_priv *priv;
        int released;

        priv = netdev_priv(dev);
        released = 0;

        while (priv->tx_desc_count < priv->tx_ring_size) {
                struct bcm_enet_desc *desc;
                struct sk_buff *skb;

                /* We run in a bh and fight against start_xmit, which
                 * is called with bh disabled  */
                spin_lock(&priv->tx_lock);

                desc = &priv->tx_desc_cpu[priv->tx_dirty_desc];

                if (!force && (desc->len_stat & DMADESC_OWNER_MASK)) {
                        spin_unlock(&priv->tx_lock);
                        break;
                }

                /* ensure other field of the descriptor were not read
                 * before we checked ownership */
                rmb();

                skb = priv->tx_skb[priv->tx_dirty_desc];
                priv->tx_skb[priv->tx_dirty_desc] = NULL;
                dma_unmap_single(&priv->pdev->dev, desc->address, skb->len,
                                 DMA_TO_DEVICE);

                priv->tx_dirty_desc++;
                if (priv->tx_dirty_desc == priv->tx_ring_size)
                        priv->tx_dirty_desc = 0;
                priv->tx_desc_count++;

                spin_unlock(&priv->tx_lock);

                if (desc->len_stat & DMADESC_UNDER_MASK)
                        dev->stats.tx_errors++;

                dev_kfree_skb(skb);
                released++;
        }

        if (netif_queue_stopped(dev) && released)
                netif_wake_queue(dev);

        return released;
}

/*
 * poll func, called by network core
 */
static int bcm_enet_poll(struct napi_struct *napi, int budget)
{
        struct bcm_enet_priv *priv;
        struct net_device *dev;
        int tx_work_done, rx_work_done;

        priv = container_of(napi, struct bcm_enet_priv, napi);
        dev = priv->net_dev;

        /* ack interrupts */
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IR, priv->rx_chan);
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IR, priv->tx_chan);

        /* reclaim sent skb */
        tx_work_done = bcm_enet_tx_reclaim(dev, 0);

        spin_lock(&priv->rx_lock);
        rx_work_done = bcm_enet_receive_queue(dev, budget);
        spin_unlock(&priv->rx_lock);

        if (rx_work_done >= budget || tx_work_done > 0) {
                /* rx/tx queue is not yet empty/clean */
                return rx_work_done;
        }

        /* no more packet in rx/tx queue, remove device from poll
         * queue */
        napi_complete(napi);

        /* restore rx/tx interrupt */
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IRMASK, priv->tx_chan);

        return rx_work_done;
}

/*
 * mac interrupt handler
 */
static irqreturn_t bcm_enet_isr_mac(int irq, void *dev_id)
{
        struct net_device *dev;
        struct bcm_enet_priv *priv;
        u32 stat;

        dev = dev_id;
        priv = netdev_priv(dev);

        stat = enet_readl(priv, ENET_IR_REG);
        if (!(stat & ENET_IR_MIB))
                return IRQ_NONE;

        /* clear & mask interrupt */
        enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
        enet_writel(priv, 0, ENET_IRMASK_REG);

        /* read mib registers in workqueue */
        schedule_work(&priv->mib_update_task);

        return IRQ_HANDLED;
}

/*
 * rx/tx dma interrupt handler
 */
static irqreturn_t bcm_enet_isr_dma(int irq, void *dev_id)
{
        struct net_device *dev;
        struct bcm_enet_priv *priv;

        dev = dev_id;
        priv = netdev_priv(dev);

        /* mask rx/tx interrupts */
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);

        napi_schedule(&priv->napi);

        return IRQ_HANDLED;
}

/*
 * tx request callback
 */
static int bcm_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct bcm_enet_desc *desc;
        u32 len_stat;
        int ret;

        priv = netdev_priv(dev);

        /* lock against tx reclaim */
        spin_lock(&priv->tx_lock);

        /* make sure  the tx hw queue  is not full,  should not happen
         * since we stop queue before it's the case */
        if (unlikely(!priv->tx_desc_count)) {
                netif_stop_queue(dev);
                dev_err(&priv->pdev->dev, "xmit called with no tx desc "
                        "available?\n");
                ret = NETDEV_TX_BUSY;
                goto out_unlock;
        }

        /* pad small packets sent on a switch device */
        if (priv->enet_is_sw && skb->len < 64) {
                int needed = 64 - skb->len;
                char *data;

                if (unlikely(skb_tailroom(skb) < needed)) {
                        struct sk_buff *nskb;

                        nskb = skb_copy_expand(skb, 0, needed, GFP_ATOMIC);
                        if (!nskb) {
                                ret = NETDEV_TX_BUSY;
                                goto out_unlock;
                        }
                        dev_kfree_skb(skb);
                        skb = nskb;
                }
                data = skb_put(skb, needed);
                memset(data, 0, needed);
        }

        /* point to the next available desc */
        desc = &priv->tx_desc_cpu[priv->tx_curr_desc];
        priv->tx_skb[priv->tx_curr_desc] = skb;

        /* fill descriptor */
        desc->address = dma_map_single(&priv->pdev->dev, skb->data, skb->len,
                                       DMA_TO_DEVICE);

        len_stat = (skb->len << DMADESC_LENGTH_SHIFT) & DMADESC_LENGTH_MASK;
        len_stat |= (DMADESC_ESOP_MASK >> priv->dma_desc_shift) |
                DMADESC_APPEND_CRC |
                DMADESC_OWNER_MASK;

        priv->tx_curr_desc++;
        if (priv->tx_curr_desc == priv->tx_ring_size) {
                priv->tx_curr_desc = 0;
                len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
        }
        priv->tx_desc_count--;

        /* dma might be already polling, make sure we update desc
         * fields in correct order */
        wmb();
        desc->len_stat = len_stat;
        wmb();

        /* kick tx dma */
        enet_dmac_writel(priv, priv->dma_chan_en_mask,
                                 ENETDMAC_CHANCFG, priv->tx_chan);

        /* stop queue if no more desc available */
        if (!priv->tx_desc_count)
                netif_stop_queue(dev);

        dev->stats.tx_bytes += skb->len;
        dev->stats.tx_packets++;
        ret = NETDEV_TX_OK;

out_unlock:
        spin_unlock(&priv->tx_lock);
        return ret;
}

/*
 * Change the interface's mac address.
 */
static int bcm_enet_set_mac_address(struct net_device *dev, void *p)
{
        struct bcm_enet_priv *priv;
        struct sockaddr *addr = p;
        u32 val;

        priv = netdev_priv(dev);
        memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);

        /* use perfect match register 0 to store my mac address */
        val = (dev->dev_addr[2] << 24) | (dev->dev_addr[3] << 16) |
                (dev->dev_addr[4] << 8) | dev->dev_addr[5];
        enet_writel(priv, val, ENET_PML_REG(0));

        val = (dev->dev_addr[0] << 8 | dev->dev_addr[1]);
        val |= ENET_PMH_DATAVALID_MASK;
        enet_writel(priv, val, ENET_PMH_REG(0));

        return 0;
}

/*
 * Change rx mode (promiscuous/allmulti) and update multicast list
 */
static void bcm_enet_set_multicast_list(struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct netdev_hw_addr *ha;
        u32 val;
        int i;

        priv = netdev_priv(dev);

        val = enet_readl(priv, ENET_RXCFG_REG);

        if (dev->flags & IFF_PROMISC)
                val |= ENET_RXCFG_PROMISC_MASK;
        else
                val &= ~ENET_RXCFG_PROMISC_MASK;

        /* only 3 perfect match registers left, first one is used for
         * own mac address */
        if ((dev->flags & IFF_ALLMULTI) || netdev_mc_count(dev) > 3)
                val |= ENET_RXCFG_ALLMCAST_MASK;
        else
                val &= ~ENET_RXCFG_ALLMCAST_MASK;

        /* no need to set perfect match registers if we catch all
         * multicast */
        if (val & ENET_RXCFG_ALLMCAST_MASK) {
                enet_writel(priv, val, ENET_RXCFG_REG);
                return;
        }

        i = 0;
        netdev_for_each_mc_addr(ha, dev) {
                u8 *dmi_addr;
                u32 tmp;

                if (i == 3)
                        break;
                /* update perfect match registers */
                dmi_addr = ha->addr;
                tmp = (dmi_addr[2] << 24) | (dmi_addr[3] << 16) |
                        (dmi_addr[4] << 8) | dmi_addr[5];
                enet_writel(priv, tmp, ENET_PML_REG(i + 1));

                tmp = (dmi_addr[0] << 8 | dmi_addr[1]);
                tmp |= ENET_PMH_DATAVALID_MASK;
                enet_writel(priv, tmp, ENET_PMH_REG(i++ + 1));
        }

        for (; i < 3; i++) {
                enet_writel(priv, 0, ENET_PML_REG(i + 1));
                enet_writel(priv, 0, ENET_PMH_REG(i + 1));
        }

        enet_writel(priv, val, ENET_RXCFG_REG);
}

/*
 * set mac duplex parameters
 */
static void bcm_enet_set_duplex(struct bcm_enet_priv *priv, int fullduplex)
{
        u32 val;

        val = enet_readl(priv, ENET_TXCTL_REG);
        if (fullduplex)
                val |= ENET_TXCTL_FD_MASK;
        else
                val &= ~ENET_TXCTL_FD_MASK;
        enet_writel(priv, val, ENET_TXCTL_REG);
}

/*
 * set mac flow control parameters
 */
static void bcm_enet_set_flow(struct bcm_enet_priv *priv, int rx_en, int tx_en)
{
        u32 val;

        /* rx flow control (pause frame handling) */
        val = enet_readl(priv, ENET_RXCFG_REG);
        if (rx_en)
                val |= ENET_RXCFG_ENFLOW_MASK;
        else
                val &= ~ENET_RXCFG_ENFLOW_MASK;
        enet_writel(priv, val, ENET_RXCFG_REG);

        if (!priv->dma_has_sram)
                return;

        /* tx flow control (pause frame generation) */
        val = enet_dma_readl(priv, ENETDMA_CFG_REG);
        if (tx_en)
                val |= ENETDMA_CFG_FLOWCH_MASK(priv->rx_chan);
        else
                val &= ~ENETDMA_CFG_FLOWCH_MASK(priv->rx_chan);
        enet_dma_writel(priv, val, ENETDMA_CFG_REG);
}

/*
 * link changed callback (from phylib)
 */
static void bcm_enet_adjust_phy_link(struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct phy_device *phydev;
        int status_changed;

        priv = netdev_priv(dev);
        phydev = priv->phydev;
        status_changed = 0;

        if (priv->old_link != phydev->link) {
                status_changed = 1;
                priv->old_link = phydev->link;
        }

        /* reflect duplex change in mac configuration */
        if (phydev->link && phydev->duplex != priv->old_duplex) {
                bcm_enet_set_duplex(priv,
                                    (phydev->duplex == DUPLEX_FULL) ? 1 : 0);
                status_changed = 1;
                priv->old_duplex = phydev->duplex;
        }

        /* enable flow control if remote advertise it (trust phylib to
         * check that duplex is full */
        if (phydev->link && phydev->pause != priv->old_pause) {
                int rx_pause_en, tx_pause_en;

                if (phydev->pause) {
                        /* pause was advertised by lpa and us */
                        rx_pause_en = 1;
                        tx_pause_en = 1;
                } else if (!priv->pause_auto) {
                        /* pause setting overrided by user */
                        rx_pause_en = priv->pause_rx;
                        tx_pause_en = priv->pause_tx;
                } else {
                        rx_pause_en = 0;
                        tx_pause_en = 0;
                }

                bcm_enet_set_flow(priv, rx_pause_en, tx_pause_en);
                status_changed = 1;
                priv->old_pause = phydev->pause;
        }

        if (status_changed) {
                pr_info("%s: link %s", dev->name, phydev->link ?
                        "UP" : "DOWN");
                if (phydev->link)
                        pr_cont(" - %d/%s - flow control %s", phydev->speed,
                               DUPLEX_FULL == phydev->duplex ? "full" : "half",
                               phydev->pause == 1 ? "rx&tx" : "off");

                pr_cont("\n");
        }
}

/*
 * link changed callback (if phylib is not used)
 */
static void bcm_enet_adjust_link(struct net_device *dev)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        bcm_enet_set_duplex(priv, priv->force_duplex_full);
        bcm_enet_set_flow(priv, priv->pause_rx, priv->pause_tx);
        netif_carrier_on(dev);

        pr_info("%s: link forced UP - %d/%s - flow control %s/%s\n",
                dev->name,
                priv->force_speed_100 ? 100 : 10,
                priv->force_duplex_full ? "full" : "half",
                priv->pause_rx ? "rx" : "off",
                priv->pause_tx ? "tx" : "off");
}

/*
 * open callback, allocate dma rings & buffers and start rx operation
 */
static int bcm_enet_open(struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct sockaddr addr;
        struct device *kdev;
        struct phy_device *phydev;
        int i, ret;
        unsigned int size;
        char phy_id[MII_BUS_ID_SIZE + 3];
        void *p;
        u32 val;

        priv = netdev_priv(dev);
        kdev = &priv->pdev->dev;

        if (priv->has_phy) {
                /* connect to PHY */
                snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
                         priv->mii_bus->id, priv->phy_id);

                phydev = phy_connect(dev, phy_id, bcm_enet_adjust_phy_link,
                                     PHY_INTERFACE_MODE_MII);

                if (IS_ERR(phydev)) {
                        dev_err(kdev, "could not attach to PHY\n");
                        return PTR_ERR(phydev);
                }

                /* mask with MAC supported features */
                phydev->supported &= (SUPPORTED_10baseT_Half |
                                      SUPPORTED_10baseT_Full |
                                      SUPPORTED_100baseT_Half |
                                      SUPPORTED_100baseT_Full |
                                      SUPPORTED_Autoneg |
                                      SUPPORTED_Pause |
                                      SUPPORTED_MII);
                phydev->advertising = phydev->supported;

                if (priv->pause_auto && priv->pause_rx && priv->pause_tx)
                        phydev->advertising |= SUPPORTED_Pause;
                else
                        phydev->advertising &= ~SUPPORTED_Pause;

                dev_info(kdev, "attached PHY at address %d [%s]\n",
                         phydev->addr, phydev->drv->name);

                priv->old_link = 0;
                priv->old_duplex = -1;
                priv->old_pause = -1;
                priv->phydev = phydev;
        }

        /* mask all interrupts and request them */
        enet_writel(priv, 0, ENET_IRMASK_REG);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);

        ret = request_irq(dev->irq, bcm_enet_isr_mac, 0, dev->name, dev);
        if (ret)
                goto out_phy_disconnect;

        ret = request_irq(priv->irq_rx, bcm_enet_isr_dma, IRQF_DISABLED,
                          dev->name, dev);
        if (ret)
                goto out_freeirq;

        ret = request_irq(priv->irq_tx, bcm_enet_isr_dma,
                          IRQF_DISABLED, dev->name, dev);
        if (ret)
                goto out_freeirq_rx;

        /* initialize perfect match registers */
        for (i = 0; i < 4; i++) {
                enet_writel(priv, 0, ENET_PML_REG(i));
                enet_writel(priv, 0, ENET_PMH_REG(i));
        }

        /* write device mac address */
        memcpy(addr.sa_data, dev->dev_addr, ETH_ALEN);
        bcm_enet_set_mac_address(dev, &addr);

        /* allocate rx dma ring */
        size = priv->rx_ring_size * sizeof(struct bcm_enet_desc);
        p = dma_alloc_coherent(kdev, size, &priv->rx_desc_dma,
                               GFP_KERNEL | __GFP_ZERO);
        if (!p) {
                ret = -ENOMEM;
                goto out_freeirq_tx;
        }

        priv->rx_desc_alloc_size = size;
        priv->rx_desc_cpu = p;

        /* allocate tx dma ring */
        size = priv->tx_ring_size * sizeof(struct bcm_enet_desc);
        p = dma_alloc_coherent(kdev, size, &priv->tx_desc_dma,
                               GFP_KERNEL | __GFP_ZERO);
        if (!p) {
                ret = -ENOMEM;
                goto out_free_rx_ring;
        }

        priv->tx_desc_alloc_size = size;
        priv->tx_desc_cpu = p;

        priv->tx_skb = kcalloc(priv->tx_ring_size, sizeof(struct sk_buff *),
                               GFP_KERNEL);
        if (!priv->tx_skb) {
                ret = -ENOMEM;
                goto out_free_tx_ring;
        }

        priv->tx_desc_count = priv->tx_ring_size;
        priv->tx_dirty_desc = 0;
        priv->tx_curr_desc = 0;
        spin_lock_init(&priv->tx_lock);

        /* init & fill rx ring with skbs */
        priv->rx_skb = kcalloc(priv->rx_ring_size, sizeof(struct sk_buff *),
                               GFP_KERNEL);
        if (!priv->rx_skb) {
                ret = -ENOMEM;
                goto out_free_tx_skb;
        }

        priv->rx_desc_count = 0;
        priv->rx_dirty_desc = 0;
        priv->rx_curr_desc = 0;

        /* initialize flow control buffer allocation */
        if (priv->dma_has_sram)
                enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
                                ENETDMA_BUFALLOC_REG(priv->rx_chan));

        else
                enet_dmac_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
                                ENETDMAC_BUFALLOC, priv->rx_chan);

        if (bcm_enet_refill_rx(dev)) {
                dev_err(kdev, "cannot allocate rx skb queue\n");
                ret = -ENOMEM;
                goto out;
        }

        /* write rx & tx ring addresses */
        if (priv->dma_has_sram) {
                enet_dmas_writel(priv, priv->rx_desc_dma,
                                 ENETDMAS_RSTART_REG, priv->rx_chan);
                enet_dmas_writel(priv, priv->tx_desc_dma,
                         ENETDMAS_RSTART_REG, priv->tx_chan);
        } else {
                enet_dmac_writel(priv, priv->rx_desc_dma,
                                ENETDMAC_RSTART, priv->rx_chan);
                enet_dmac_writel(priv, priv->tx_desc_dma,
                                ENETDMAC_RSTART, priv->tx_chan);
        }

        /* clear remaining state ram for rx & tx channel */
        if (priv->dma_has_sram) {
                enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->rx_chan);
                enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->tx_chan);
                enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->rx_chan);
                enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->tx_chan);
                enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->rx_chan);
                enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->tx_chan);
        } else {
                enet_dmac_writel(priv, 0, ENETDMAC_FC, priv->rx_chan);
                enet_dmac_writel(priv, 0, ENETDMAC_FC, priv->tx_chan);
        }

        /* set max rx/tx length */
        enet_writel(priv, priv->hw_mtu, ENET_RXMAXLEN_REG);
        enet_writel(priv, priv->hw_mtu, ENET_TXMAXLEN_REG);

        /* set dma maximum burst len */
        enet_dmac_writel(priv, priv->dma_maxburst,
                         ENETDMAC_MAXBURST, priv->rx_chan);
        enet_dmac_writel(priv, priv->dma_maxburst,
                         ENETDMAC_MAXBURST, priv->tx_chan);

        /* set correct transmit fifo watermark */
        enet_writel(priv, BCMENET_TX_FIFO_TRESH, ENET_TXWMARK_REG);

        /* set flow control low/high threshold to 1/3 / 2/3 */
        if (priv->dma_has_sram) {
                val = priv->rx_ring_size / 3;
                enet_dma_writel(priv, val, ENETDMA_FLOWCL_REG(priv->rx_chan));
                val = (priv->rx_ring_size * 2) / 3;
                enet_dma_writel(priv, val, ENETDMA_FLOWCH_REG(priv->rx_chan));
        } else {
                enet_dmac_writel(priv, 5, ENETDMAC_FC, priv->rx_chan);
                enet_dmac_writel(priv, priv->rx_ring_size, ENETDMAC_LEN, priv->rx_chan);
                enet_dmac_writel(priv, priv->tx_ring_size, ENETDMAC_LEN, priv->tx_chan);
        }

        /* all set, enable mac and interrupts, start dma engine and
         * kick rx dma channel */
        wmb();
        val = enet_readl(priv, ENET_CTL_REG);
        val |= ENET_CTL_ENABLE_MASK;
        enet_writel(priv, val, ENET_CTL_REG);
        enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
        enet_dmac_writel(priv, priv->dma_chan_en_mask,
                         ENETDMAC_CHANCFG, priv->rx_chan);

        /* watch "mib counters about to overflow" interrupt */
        enet_writel(priv, ENET_IR_MIB, ENET_IR_REG);
        enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);

        /* watch "packet transferred" interrupt in rx and tx */
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IR, priv->rx_chan);
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IR, priv->tx_chan);

        /* make sure we enable napi before rx interrupt  */
        napi_enable(&priv->napi);

        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, priv->dma_chan_int_mask,
                         ENETDMAC_IRMASK, priv->tx_chan);

        if (priv->has_phy)
                phy_start(priv->phydev);
        else
                bcm_enet_adjust_link(dev);

        netif_start_queue(dev);
        return 0;

out:
        for (i = 0; i < priv->rx_ring_size; i++) {
                struct bcm_enet_desc *desc;

                if (!priv->rx_skb[i])
                        continue;

                desc = &priv->rx_desc_cpu[i];
                dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
                                 DMA_FROM_DEVICE);
                kfree_skb(priv->rx_skb[i]);
        }
        kfree(priv->rx_skb);

out_free_tx_skb:
        kfree(priv->tx_skb);

out_free_tx_ring:
        dma_free_coherent(kdev, priv->tx_desc_alloc_size,
                          priv->tx_desc_cpu, priv->tx_desc_dma);

out_free_rx_ring:
        dma_free_coherent(kdev, priv->rx_desc_alloc_size,
                          priv->rx_desc_cpu, priv->rx_desc_dma);

out_freeirq_tx:
        free_irq(priv->irq_tx, dev);

out_freeirq_rx:
        free_irq(priv->irq_rx, dev);

out_freeirq:
        free_irq(dev->irq, dev);

out_phy_disconnect:
        phy_disconnect(priv->phydev);

        return ret;
}

/*
 * disable mac
 */
static void bcm_enet_disable_mac(struct bcm_enet_priv *priv)
{
        int limit;
        u32 val;

        val = enet_readl(priv, ENET_CTL_REG);
        val |= ENET_CTL_DISABLE_MASK;
        enet_writel(priv, val, ENET_CTL_REG);

        limit = 1000;
        do {
                u32 val;

                val = enet_readl(priv, ENET_CTL_REG);
                if (!(val & ENET_CTL_DISABLE_MASK))
                        break;
                udelay(1);
        } while (limit--);
}

/*
 * disable dma in given channel
 */
static void bcm_enet_disable_dma(struct bcm_enet_priv *priv, int chan)
{
        int limit;

        enet_dmac_writel(priv, 0, ENETDMAC_CHANCFG, chan);

        limit = 1000;
        do {
                u32 val;

                val = enet_dmac_readl(priv, ENETDMAC_CHANCFG, chan);
                if (!(val & ENETDMAC_CHANCFG_EN_MASK))
                        break;
                udelay(1);
        } while (limit--);
}

/*
 * stop callback
 */
static int bcm_enet_stop(struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct device *kdev;
        int i;

        priv = netdev_priv(dev);
        kdev = &priv->pdev->dev;

        netif_stop_queue(dev);
        napi_disable(&priv->napi);
        if (priv->has_phy)
                phy_stop(priv->phydev);
        del_timer_sync(&priv->rx_timeout);

        /* mask all interrupts */
        enet_writel(priv, 0, ENET_IRMASK_REG);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);

        /* make sure no mib update is scheduled */
        cancel_work_sync(&priv->mib_update_task);

        /* disable dma & mac */
        bcm_enet_disable_dma(priv, priv->tx_chan);
        bcm_enet_disable_dma(priv, priv->rx_chan);
        bcm_enet_disable_mac(priv);

        /* force reclaim of all tx buffers */
        bcm_enet_tx_reclaim(dev, 1);

        /* free the rx skb ring */
        for (i = 0; i < priv->rx_ring_size; i++) {
                struct bcm_enet_desc *desc;

                if (!priv->rx_skb[i])
                        continue;

                desc = &priv->rx_desc_cpu[i];
                dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
                                 DMA_FROM_DEVICE);
                kfree_skb(priv->rx_skb[i]);
        }

        /* free remaining allocated memory */
        kfree(priv->rx_skb);
        kfree(priv->tx_skb);
        dma_free_coherent(kdev, priv->rx_desc_alloc_size,
                          priv->rx_desc_cpu, priv->rx_desc_dma);
        dma_free_coherent(kdev, priv->tx_desc_alloc_size,
                          priv->tx_desc_cpu, priv->tx_desc_dma);
        free_irq(priv->irq_tx, dev);
        free_irq(priv->irq_rx, dev);
        free_irq(dev->irq, dev);

        /* release phy */
        if (priv->has_phy) {
                phy_disconnect(priv->phydev);
                priv->phydev = NULL;
        }

        return 0;
}

/*
 * ethtool callbacks
 */
struct bcm_enet_stats {
        char stat_string[ETH_GSTRING_LEN];
        int sizeof_stat;
        int stat_offset;
        int mib_reg;
};

#define GEN_STAT(m) sizeof(((struct bcm_enet_priv *)0)->m),             \
                     offsetof(struct bcm_enet_priv, m)
#define DEV_STAT(m) sizeof(((struct net_device_stats *)0)->m),          \
                     offsetof(struct net_device_stats, m)

static const struct bcm_enet_stats bcm_enet_gstrings_stats[] = {
        { "rx_packets", DEV_STAT(rx_packets), -1 },
        { "tx_packets", DEV_STAT(tx_packets), -1 },
        { "rx_bytes", DEV_STAT(rx_bytes), -1 },
        { "tx_bytes", DEV_STAT(tx_bytes), -1 },
        { "rx_errors", DEV_STAT(rx_errors), -1 },
        { "tx_errors", DEV_STAT(tx_errors), -1 },
        { "rx_dropped", DEV_STAT(rx_dropped), -1 },
        { "tx_dropped", DEV_STAT(tx_dropped), -1 },

        { "rx_good_octets", GEN_STAT(mib.rx_gd_octets), ETH_MIB_RX_GD_OCTETS},
        { "rx_good_pkts", GEN_STAT(mib.rx_gd_pkts), ETH_MIB_RX_GD_PKTS },
        { "rx_broadcast", GEN_STAT(mib.rx_brdcast), ETH_MIB_RX_BRDCAST },
        { "rx_multicast", GEN_STAT(mib.rx_mult), ETH_MIB_RX_MULT },
        { "rx_64_octets", GEN_STAT(mib.rx_64), ETH_MIB_RX_64 },
        { "rx_65_127_oct", GEN_STAT(mib.rx_65_127), ETH_MIB_RX_65_127 },
        { "rx_128_255_oct", GEN_STAT(mib.rx_128_255), ETH_MIB_RX_128_255 },
        { "rx_256_511_oct", GEN_STAT(mib.rx_256_511), ETH_MIB_RX_256_511 },
        { "rx_512_1023_oct", GEN_STAT(mib.rx_512_1023), ETH_MIB_RX_512_1023 },
        { "rx_1024_max_oct", GEN_STAT(mib.rx_1024_max), ETH_MIB_RX_1024_MAX },
        { "rx_jabber", GEN_STAT(mib.rx_jab), ETH_MIB_RX_JAB },
        { "rx_oversize", GEN_STAT(mib.rx_ovr), ETH_MIB_RX_OVR },
        { "rx_fragment", GEN_STAT(mib.rx_frag), ETH_MIB_RX_FRAG },
        { "rx_dropped", GEN_STAT(mib.rx_drop), ETH_MIB_RX_DROP },
        { "rx_crc_align", GEN_STAT(mib.rx_crc_align), ETH_MIB_RX_CRC_ALIGN },
        { "rx_undersize", GEN_STAT(mib.rx_und), ETH_MIB_RX_UND },
        { "rx_crc", GEN_STAT(mib.rx_crc), ETH_MIB_RX_CRC },
        { "rx_align", GEN_STAT(mib.rx_align), ETH_MIB_RX_ALIGN },
        { "rx_symbol_error", GEN_STAT(mib.rx_sym), ETH_MIB_RX_SYM },
        { "rx_pause", GEN_STAT(mib.rx_pause), ETH_MIB_RX_PAUSE },
        { "rx_control", GEN_STAT(mib.rx_cntrl), ETH_MIB_RX_CNTRL },

        { "tx_good_octets", GEN_STAT(mib.tx_gd_octets), ETH_MIB_TX_GD_OCTETS },
        { "tx_good_pkts", GEN_STAT(mib.tx_gd_pkts), ETH_MIB_TX_GD_PKTS },
        { "tx_broadcast", GEN_STAT(mib.tx_brdcast), ETH_MIB_TX_BRDCAST },
        { "tx_multicast", GEN_STAT(mib.tx_mult), ETH_MIB_TX_MULT },
        { "tx_64_oct", GEN_STAT(mib.tx_64), ETH_MIB_TX_64 },
        { "tx_65_127_oct", GEN_STAT(mib.tx_65_127), ETH_MIB_TX_65_127 },
        { "tx_128_255_oct", GEN_STAT(mib.tx_128_255), ETH_MIB_TX_128_255 },
        { "tx_256_511_oct", GEN_STAT(mib.tx_256_511), ETH_MIB_TX_256_511 },
        { "tx_512_1023_oct", GEN_STAT(mib.tx_512_1023), ETH_MIB_TX_512_1023},
        { "tx_1024_max_oct", GEN_STAT(mib.tx_1024_max), ETH_MIB_TX_1024_MAX },
        { "tx_jabber", GEN_STAT(mib.tx_jab), ETH_MIB_TX_JAB },
        { "tx_oversize", GEN_STAT(mib.tx_ovr), ETH_MIB_TX_OVR },
        { "tx_fragment", GEN_STAT(mib.tx_frag), ETH_MIB_TX_FRAG },
        { "tx_underrun", GEN_STAT(mib.tx_underrun), ETH_MIB_TX_UNDERRUN },
        { "tx_collisions", GEN_STAT(mib.tx_col), ETH_MIB_TX_COL },
        { "tx_single_collision", GEN_STAT(mib.tx_1_col), ETH_MIB_TX_1_COL },
        { "tx_multiple_collision", GEN_STAT(mib.tx_m_col), ETH_MIB_TX_M_COL },
        { "tx_excess_collision", GEN_STAT(mib.tx_ex_col), ETH_MIB_TX_EX_COL },
        { "tx_late_collision", GEN_STAT(mib.tx_late), ETH_MIB_TX_LATE },
        { "tx_deferred", GEN_STAT(mib.tx_def), ETH_MIB_TX_DEF },
        { "tx_carrier_sense", GEN_STAT(mib.tx_crs), ETH_MIB_TX_CRS },
        { "tx_pause", GEN_STAT(mib.tx_pause), ETH_MIB_TX_PAUSE },

};

#define BCM_ENET_STATS_LEN      \
        (sizeof(bcm_enet_gstrings_stats) / sizeof(struct bcm_enet_stats))

static const u32 unused_mib_regs[] = {
        ETH_MIB_TX_ALL_OCTETS,
        ETH_MIB_TX_ALL_PKTS,
        ETH_MIB_RX_ALL_OCTETS,
        ETH_MIB_RX_ALL_PKTS,
};


static void bcm_enet_get_drvinfo(struct net_device *netdev,
                                 struct ethtool_drvinfo *drvinfo)
{
        strlcpy(drvinfo->driver, bcm_enet_driver_name, sizeof(drvinfo->driver));
        strlcpy(drvinfo->version, bcm_enet_driver_version,
                sizeof(drvinfo->version));
        strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
        strlcpy(drvinfo->bus_info, "bcm63xx", sizeof(drvinfo->bus_info));
        drvinfo->n_stats = BCM_ENET_STATS_LEN;
}

static int bcm_enet_get_sset_count(struct net_device *netdev,
                                        int string_set)
{
        switch (string_set) {
        case ETH_SS_STATS:
                return BCM_ENET_STATS_LEN;
        default:
                return -EINVAL;
        }
}

static void bcm_enet_get_strings(struct net_device *netdev,
                                 u32 stringset, u8 *data)
{
        int i;

        switch (stringset) {
        case ETH_SS_STATS:
                for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
                        memcpy(data + i * ETH_GSTRING_LEN,
                               bcm_enet_gstrings_stats[i].stat_string,
                               ETH_GSTRING_LEN);
                }
                break;
        }
}

static void update_mib_counters(struct bcm_enet_priv *priv)
{
        int i;

        for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
                const struct bcm_enet_stats *s;
                u32 val;
                char *p;

                s = &bcm_enet_gstrings_stats[i];
                if (s->mib_reg == -1)
                        continue;

                val = enet_readl(priv, ENET_MIB_REG(s->mib_reg));
                p = (char *)priv + s->stat_offset;

                if (s->sizeof_stat == sizeof(u64))
                        *(u64 *)p += val;
                else
                        *(u32 *)p += val;
        }

        /* also empty unused mib counters to make sure mib counter
         * overflow interrupt is cleared */
        for (i = 0; i < ARRAY_SIZE(unused_mib_regs); i++)
                (void)enet_readl(priv, ENET_MIB_REG(unused_mib_regs[i]));
}

static void bcm_enet_update_mib_counters_defer(struct work_struct *t)
{
        struct bcm_enet_priv *priv;

        priv = container_of(t, struct bcm_enet_priv, mib_update_task);
        mutex_lock(&priv->mib_update_lock);
        update_mib_counters(priv);
        mutex_unlock(&priv->mib_update_lock);

        /* reenable mib interrupt */
        if (netif_running(priv->net_dev))
                enet_writel(priv, ENET_IR_MIB, ENET_IRMASK_REG);
}

static void bcm_enet_get_ethtool_stats(struct net_device *netdev,
                                       struct ethtool_stats *stats,
                                       u64 *data)
{
        struct bcm_enet_priv *priv;
        int i;

        priv = netdev_priv(netdev);

        mutex_lock(&priv->mib_update_lock);
        update_mib_counters(priv);

        for (i = 0; i < BCM_ENET_STATS_LEN; i++) {
                const struct bcm_enet_stats *s;
                char *p;

                s = &bcm_enet_gstrings_stats[i];
                if (s->mib_reg == -1)
                        p = (char *)&netdev->stats;
                else
                        p = (char *)priv;
                p += s->stat_offset;
                data[i] = (s->sizeof_stat == sizeof(u64)) ?
                        *(u64 *)p : *(u32 *)p;
        }
        mutex_unlock(&priv->mib_update_lock);
}

static int bcm_enet_nway_reset(struct net_device *dev)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        if (priv->has_phy) {
                if (!priv->phydev)
                        return -ENODEV;
                return genphy_restart_aneg(priv->phydev);
        }

        return -EOPNOTSUPP;
}

static int bcm_enet_get_settings(struct net_device *dev,
                                 struct ethtool_cmd *cmd)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);

        cmd->maxrxpkt = 0;
        cmd->maxtxpkt = 0;

        if (priv->has_phy) {
                if (!priv->phydev)
                        return -ENODEV;
                return phy_ethtool_gset(priv->phydev, cmd);
        } else {
                cmd->autoneg = 0;
                ethtool_cmd_speed_set(cmd, ((priv->force_speed_100)
                                            ? SPEED_100 : SPEED_10));
                cmd->duplex = (priv->force_duplex_full) ?
                        DUPLEX_FULL : DUPLEX_HALF;
                cmd->supported = ADVERTISED_10baseT_Half  |
                        ADVERTISED_10baseT_Full |
                        ADVERTISED_100baseT_Half |
                        ADVERTISED_100baseT_Full;
                cmd->advertising = 0;
                cmd->port = PORT_MII;
                cmd->transceiver = XCVR_EXTERNAL;
        }
        return 0;
}

static int bcm_enet_set_settings(struct net_device *dev,
                                 struct ethtool_cmd *cmd)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        if (priv->has_phy) {
                if (!priv->phydev)
                        return -ENODEV;
                return phy_ethtool_sset(priv->phydev, cmd);
        } else {

                if (cmd->autoneg ||
                    (cmd->speed != SPEED_100 && cmd->speed != SPEED_10) ||
                    cmd->port != PORT_MII)
                        return -EINVAL;

                priv->force_speed_100 = (cmd->speed == SPEED_100) ? 1 : 0;
                priv->force_duplex_full = (cmd->duplex == DUPLEX_FULL) ? 1 : 0;

                if (netif_running(dev))
                        bcm_enet_adjust_link(dev);
                return 0;
        }
}

static void bcm_enet_get_ringparam(struct net_device *dev,
                                   struct ethtool_ringparam *ering)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);

        /* rx/tx ring is actually only limited by memory */
        ering->rx_max_pending = 8192;
        ering->tx_max_pending = 8192;
        ering->rx_pending = priv->rx_ring_size;
        ering->tx_pending = priv->tx_ring_size;
}

static int bcm_enet_set_ringparam(struct net_device *dev,
                                  struct ethtool_ringparam *ering)
{
        struct bcm_enet_priv *priv;
        int was_running;

        priv = netdev_priv(dev);

        was_running = 0;
        if (netif_running(dev)) {
                bcm_enet_stop(dev);
                was_running = 1;
        }

        priv->rx_ring_size = ering->rx_pending;
        priv->tx_ring_size = ering->tx_pending;

        if (was_running) {
                int err;

                err = bcm_enet_open(dev);
                if (err)
                        dev_close(dev);
                else
                        bcm_enet_set_multicast_list(dev);
        }
        return 0;
}

static void bcm_enet_get_pauseparam(struct net_device *dev,
                                    struct ethtool_pauseparam *ecmd)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        ecmd->autoneg = priv->pause_auto;
        ecmd->rx_pause = priv->pause_rx;
        ecmd->tx_pause = priv->pause_tx;
}

static int bcm_enet_set_pauseparam(struct net_device *dev,
                                   struct ethtool_pauseparam *ecmd)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);

        if (priv->has_phy) {
                if (ecmd->autoneg && (ecmd->rx_pause != ecmd->tx_pause)) {
                        /* asymetric pause mode not supported,
                         * actually possible but integrated PHY has RO
                         * asym_pause bit */
                        return -EINVAL;
                }
        } else {
                /* no pause autoneg on direct mii connection */
                if (ecmd->autoneg)
                        return -EINVAL;
        }

        priv->pause_auto = ecmd->autoneg;
        priv->pause_rx = ecmd->rx_pause;
        priv->pause_tx = ecmd->tx_pause;

        return 0;
}

static const struct ethtool_ops bcm_enet_ethtool_ops = {
        .get_strings            = bcm_enet_get_strings,
        .get_sset_count         = bcm_enet_get_sset_count,
        .get_ethtool_stats      = bcm_enet_get_ethtool_stats,
        .nway_reset             = bcm_enet_nway_reset,
        .get_settings           = bcm_enet_get_settings,
        .set_settings           = bcm_enet_set_settings,
        .get_drvinfo            = bcm_enet_get_drvinfo,
        .get_link               = ethtool_op_get_link,
        .get_ringparam          = bcm_enet_get_ringparam,
        .set_ringparam          = bcm_enet_set_ringparam,
        .get_pauseparam         = bcm_enet_get_pauseparam,
        .set_pauseparam         = bcm_enet_set_pauseparam,
};

static int bcm_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        if (priv->has_phy) {
                if (!priv->phydev)
                        return -ENODEV;
                return phy_mii_ioctl(priv->phydev, rq, cmd);
        } else {
                struct mii_if_info mii;

                mii.dev = dev;
                mii.mdio_read = bcm_enet_mdio_read_mii;
                mii.mdio_write = bcm_enet_mdio_write_mii;
                mii.phy_id = 0;
                mii.phy_id_mask = 0x3f;
                mii.reg_num_mask = 0x1f;
                return generic_mii_ioctl(&mii, if_mii(rq), cmd, NULL);
        }
}

/*
 * calculate actual hardware mtu
 */
static int compute_hw_mtu(struct bcm_enet_priv *priv, int mtu)
{
        int actual_mtu;

        actual_mtu = mtu;

        /* add ethernet header + vlan tag size */
        actual_mtu += VLAN_ETH_HLEN;

        if (actual_mtu < 64 || actual_mtu > BCMENET_MAX_MTU)
                return -EINVAL;

        /*
         * setup maximum size before we get overflow mark in
         * descriptor, note that this will not prevent reception of
         * big frames, they will be split into multiple buffers
         * anyway
         */
        priv->hw_mtu = actual_mtu;

        /*
         * align rx buffer size to dma burst len, account FCS since
         * it's appended
         */
        priv->rx_skb_size = ALIGN(actual_mtu + ETH_FCS_LEN,
                                  priv->dma_maxburst * 4);
        return 0;
}

/*
 * adjust mtu, can't be called while device is running
 */
static int bcm_enet_change_mtu(struct net_device *dev, int new_mtu)
{
        int ret;

        if (netif_running(dev))
                return -EBUSY;

        ret = compute_hw_mtu(netdev_priv(dev), new_mtu);
        if (ret)
                return ret;
        dev->mtu = new_mtu;
        return 0;
}

/*
 * preinit hardware to allow mii operation while device is down
 */
static void bcm_enet_hw_preinit(struct bcm_enet_priv *priv)
{
        u32 val;
        int limit;

        /* make sure mac is disabled */
        bcm_enet_disable_mac(priv);

        /* soft reset mac */
        val = ENET_CTL_SRESET_MASK;
        enet_writel(priv, val, ENET_CTL_REG);
        wmb();

        limit = 1000;
        do {
                val = enet_readl(priv, ENET_CTL_REG);
                if (!(val & ENET_CTL_SRESET_MASK))
                        break;
                udelay(1);
        } while (limit--);

        /* select correct mii interface */
        val = enet_readl(priv, ENET_CTL_REG);
        if (priv->use_external_mii)
                val |= ENET_CTL_EPHYSEL_MASK;
        else
                val &= ~ENET_CTL_EPHYSEL_MASK;
        enet_writel(priv, val, ENET_CTL_REG);

        /* turn on mdc clock */
        enet_writel(priv, (0x1f << ENET_MIISC_MDCFREQDIV_SHIFT) |
                    ENET_MIISC_PREAMBLEEN_MASK, ENET_MIISC_REG);

        /* set mib counters to self-clear when read */
        val = enet_readl(priv, ENET_MIBCTL_REG);
        val |= ENET_MIBCTL_RDCLEAR_MASK;
        enet_writel(priv, val, ENET_MIBCTL_REG);
}

static const struct net_device_ops bcm_enet_ops = {
        .ndo_open               = bcm_enet_open,
        .ndo_stop               = bcm_enet_stop,
        .ndo_start_xmit         = bcm_enet_start_xmit,
        .ndo_set_mac_address    = bcm_enet_set_mac_address,
        .ndo_set_rx_mode        = bcm_enet_set_multicast_list,
        .ndo_do_ioctl           = bcm_enet_ioctl,
        .ndo_change_mtu         = bcm_enet_change_mtu,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller = bcm_enet_netpoll,
#endif
};

/*
 * allocate netdevice, request register memory and register device.
 */
static int bcm_enet_probe(struct platform_device *pdev)
{
        struct bcm_enet_priv *priv;
        struct net_device *dev;
        struct bcm63xx_enet_platform_data *pd;
        struct resource *res_mem, *res_irq, *res_irq_rx, *res_irq_tx;
        struct mii_bus *bus;
        const char *clk_name;
        int i, ret;

        /* stop if shared driver failed, assume driver->probe will be
         * called in the same order we register devices (correct ?) */
        if (!bcm_enet_shared_base[0])
                return -ENODEV;

        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
        res_irq_rx = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
        res_irq_tx = platform_get_resource(pdev, IORESOURCE_IRQ, 2);
        if (!res_mem || !res_irq || !res_irq_rx || !res_irq_tx)
                return -ENODEV;

        ret = 0;
        dev = alloc_etherdev(sizeof(*priv));
        if (!dev)
                return -ENOMEM;
        priv = netdev_priv(dev);

        priv->enet_is_sw = false;
        priv->dma_maxburst = BCMENET_DMA_MAXBURST;

        ret = compute_hw_mtu(priv, dev->mtu);
        if (ret)
                goto out;

        priv->base = devm_request_and_ioremap(&pdev->dev, res_mem);
        if (priv->base == NULL) {
                ret = -ENOMEM;
                goto out;
        }

        dev->irq = priv->irq = res_irq->start;
        priv->irq_rx = res_irq_rx->start;
        priv->irq_tx = res_irq_tx->start;
        priv->mac_id = pdev->id;

        /* get rx & tx dma channel id for this mac */
        if (priv->mac_id == 0) {
                priv->rx_chan = 0;
                priv->tx_chan = 1;
                clk_name = "enet0";
        } else {
                priv->rx_chan = 2;
                priv->tx_chan = 3;
                clk_name = "enet1";
        }

        priv->mac_clk = clk_get(&pdev->dev, clk_name);
        if (IS_ERR(priv->mac_clk)) {
                ret = PTR_ERR(priv->mac_clk);
                goto out;
        }
        clk_prepare_enable(priv->mac_clk);

        /* initialize default and fetch platform data */
        priv->rx_ring_size = BCMENET_DEF_RX_DESC;
        priv->tx_ring_size = BCMENET_DEF_TX_DESC;

        pd = pdev->dev.platform_data;
        if (pd) {
                memcpy(dev->dev_addr, pd->mac_addr, ETH_ALEN);
                priv->has_phy = pd->has_phy;
                priv->phy_id = pd->phy_id;
                priv->has_phy_interrupt = pd->has_phy_interrupt;
                priv->phy_interrupt = pd->phy_interrupt;
                priv->use_external_mii = !pd->use_internal_phy;
                priv->pause_auto = pd->pause_auto;
                priv->pause_rx = pd->pause_rx;
                priv->pause_tx = pd->pause_tx;
                priv->force_duplex_full = pd->force_duplex_full;
                priv->force_speed_100 = pd->force_speed_100;
                priv->dma_chan_en_mask = pd->dma_chan_en_mask;
                priv->dma_chan_int_mask = pd->dma_chan_int_mask;
                priv->dma_chan_width = pd->dma_chan_width;
                priv->dma_has_sram = pd->dma_has_sram;
                priv->dma_desc_shift = pd->dma_desc_shift;
        }

        if (priv->mac_id == 0 && priv->has_phy && !priv->use_external_mii) {
                /* using internal PHY, enable clock */
                priv->phy_clk = clk_get(&pdev->dev, "ephy");
                if (IS_ERR(priv->phy_clk)) {
                        ret = PTR_ERR(priv->phy_clk);
                        priv->phy_clk = NULL;
                        goto out_put_clk_mac;
                }
                clk_prepare_enable(priv->phy_clk);
        }

        /* do minimal hardware init to be able to probe mii bus */
        bcm_enet_hw_preinit(priv);

        /* MII bus registration */
        if (priv->has_phy) {

                priv->mii_bus = mdiobus_alloc();
                if (!priv->mii_bus) {
                        ret = -ENOMEM;
                        goto out_uninit_hw;
                }

                bus = priv->mii_bus;
                bus->name = "bcm63xx_enet MII bus";
                bus->parent = &pdev->dev;
                bus->priv = priv;
                bus->read = bcm_enet_mdio_read_phylib;
                bus->write = bcm_enet_mdio_write_phylib;
                sprintf(bus->id, "%s-%d", pdev->name, priv->mac_id);

                /* only probe bus where we think the PHY is, because
                 * the mdio read operation return 0 instead of 0xffff
                 * if a slave is not present on hw */
                bus->phy_mask = ~(1 << priv->phy_id);

                bus->irq = devm_kzalloc(&pdev->dev, sizeof(int) * PHY_MAX_ADDR,
                                        GFP_KERNEL);
                if (!bus->irq) {
                        ret = -ENOMEM;
                        goto out_free_mdio;
                }

                if (priv->has_phy_interrupt)
                        bus->irq[priv->phy_id] = priv->phy_interrupt;
                else
                        bus->irq[priv->phy_id] = PHY_POLL;

                ret = mdiobus_register(bus);
                if (ret) {
                        dev_err(&pdev->dev, "unable to register mdio bus\n");
                        goto out_free_mdio;
                }
        } else {

                /* run platform code to initialize PHY device */
                if (pd->mii_config &&
                    pd->mii_config(dev, 1, bcm_enet_mdio_read_mii,
                                   bcm_enet_mdio_write_mii)) {
                        dev_err(&pdev->dev, "unable to configure mdio bus\n");
                        goto out_uninit_hw;
                }
        }

        spin_lock_init(&priv->rx_lock);

        /* init rx timeout (used for oom) */
        init_timer(&priv->rx_timeout);
        priv->rx_timeout.function = bcm_enet_refill_rx_timer;
        priv->rx_timeout.data = (unsigned long)dev;

        /* init the mib update lock&work */
        mutex_init(&priv->mib_update_lock);
        INIT_WORK(&priv->mib_update_task, bcm_enet_update_mib_counters_defer);

        /* zero mib counters */
        for (i = 0; i < ENET_MIB_REG_COUNT; i++)
                enet_writel(priv, 0, ENET_MIB_REG(i));

        /* register netdevice */
        dev->netdev_ops = &bcm_enet_ops;
        netif_napi_add(dev, &priv->napi, bcm_enet_poll, 16);

        SET_ETHTOOL_OPS(dev, &bcm_enet_ethtool_ops);
        SET_NETDEV_DEV(dev, &pdev->dev);

        ret = register_netdev(dev);
        if (ret)
                goto out_unregister_mdio;

        netif_carrier_off(dev);
        platform_set_drvdata(pdev, dev);
        priv->pdev = pdev;
        priv->net_dev = dev;

        return 0;

out_unregister_mdio:
        if (priv->mii_bus)
                mdiobus_unregister(priv->mii_bus);

out_free_mdio:
        if (priv->mii_bus)
                mdiobus_free(priv->mii_bus);

out_uninit_hw:
        /* turn off mdc clock */
        enet_writel(priv, 0, ENET_MIISC_REG);
        if (priv->phy_clk) {
                clk_disable_unprepare(priv->phy_clk);
                clk_put(priv->phy_clk);
        }

out_put_clk_mac:
        clk_disable_unprepare(priv->mac_clk);
        clk_put(priv->mac_clk);
out:
        free_netdev(dev);
        return ret;
}


/*
 * exit func, stops hardware and unregisters netdevice
 */
static int bcm_enet_remove(struct platform_device *pdev)
{
        struct bcm_enet_priv *priv;
        struct net_device *dev;

        /* stop netdevice */
        dev = platform_get_drvdata(pdev);
        priv = netdev_priv(dev);
        unregister_netdev(dev);

        /* turn off mdc clock */
        enet_writel(priv, 0, ENET_MIISC_REG);

        if (priv->has_phy) {
                mdiobus_unregister(priv->mii_bus);
                mdiobus_free(priv->mii_bus);
        } else {
                struct bcm63xx_enet_platform_data *pd;

                pd = pdev->dev.platform_data;
                if (pd && pd->mii_config)
                        pd->mii_config(dev, 0, bcm_enet_mdio_read_mii,
                                       bcm_enet_mdio_write_mii);
        }

        /* disable hw block clocks */
        if (priv->phy_clk) {
                clk_disable_unprepare(priv->phy_clk);
                clk_put(priv->phy_clk);
        }
        clk_disable_unprepare(priv->mac_clk);
        clk_put(priv->mac_clk);

        free_netdev(dev);
        return 0;
}

struct platform_driver bcm63xx_enet_driver = {
        .probe  = bcm_enet_probe,
        .remove = bcm_enet_remove,
        .driver = {
                .name   = "bcm63xx_enet",
                .owner  = THIS_MODULE,
        },
};

/*
 * switch mii access callbacks
 */
static int bcmenet_sw_mdio_read(struct bcm_enet_priv *priv,
                                int ext, int phy_id, int location)
{
        u32 reg;

        int ret;

        spin_lock_bh(&priv->enetsw_mdio_lock);
        enetsw_writel(priv, 0, ENETSW_MDIOC_REG);

        reg = ENETSW_MDIOC_RD_MASK |
                (phy_id << ENETSW_MDIOC_PHYID_SHIFT) |
                (location << ENETSW_MDIOC_REG_SHIFT);

        if (ext)
                reg |= ENETSW_MDIOC_EXT_MASK;

        enetsw_writel(priv, reg, ENETSW_MDIOC_REG);
        udelay(50);
        ret = enetsw_readw(priv, ENETSW_MDIOD_REG);
        spin_unlock_bh(&priv->enetsw_mdio_lock);
        return ret;
}

static void bcmenet_sw_mdio_write(struct bcm_enet_priv *priv,
                                 int ext, int phy_id, int location,
                                 uint16_t data)
{
        u32 reg;

        spin_lock_bh(&priv->enetsw_mdio_lock);
        enetsw_writel(priv, 0, ENETSW_MDIOC_REG);

        reg = ENETSW_MDIOC_WR_MASK |
                (phy_id << ENETSW_MDIOC_PHYID_SHIFT) |
                (location << ENETSW_MDIOC_REG_SHIFT);

        if (ext)
                reg |= ENETSW_MDIOC_EXT_MASK;

        reg |= data;

        enetsw_writel(priv, reg, ENETSW_MDIOC_REG);
        udelay(50);
        spin_unlock_bh(&priv->enetsw_mdio_lock);
}

static inline int bcm_enet_port_is_rgmii(int portid)
{
        return portid >= ENETSW_RGMII_PORT0;
}

/*
 * enet sw PHY polling
 */
static void swphy_poll_timer(unsigned long data)
{
        struct bcm_enet_priv *priv = (struct bcm_enet_priv *)data;
        unsigned int i;

        for (i = 0; i < priv->num_ports; i++) {
                struct bcm63xx_enetsw_port *port;
                int val, j, up, advertise, lpa, lpa2, speed, duplex, media;
                int external_phy = bcm_enet_port_is_rgmii(i);
                u8 override;

                port = &priv->used_ports[i];
                if (!port->used)
                        continue;

                if (port->bypass_link)
                        continue;

                /* dummy read to clear */
                for (j = 0; j < 2; j++)
                        val = bcmenet_sw_mdio_read(priv, external_phy,
                                                   port->phy_id, MII_BMSR);

                if (val == 0xffff)
                        continue;

                up = (val & BMSR_LSTATUS) ? 1 : 0;
                if (!(up ^ priv->sw_port_link[i]))
                        continue;

                priv->sw_port_link[i] = up;

                /* link changed */
                if (!up) {
                        dev_info(&priv->pdev->dev, "link DOWN on %s\n",
                                 port->name);
                        enetsw_writeb(priv, ENETSW_PORTOV_ENABLE_MASK,
                                      ENETSW_PORTOV_REG(i));
                        enetsw_writeb(priv, ENETSW_PTCTRL_RXDIS_MASK |
                                      ENETSW_PTCTRL_TXDIS_MASK,
                                      ENETSW_PTCTRL_REG(i));
                        continue;
                }

                advertise = bcmenet_sw_mdio_read(priv, external_phy,
                                                 port->phy_id, MII_ADVERTISE);

                lpa = bcmenet_sw_mdio_read(priv, external_phy, port->phy_id,
                                           MII_LPA);

                lpa2 = bcmenet_sw_mdio_read(priv, external_phy, port->phy_id,
                                            MII_STAT1000);

                /* figure out media and duplex from advertise and LPA values */
                media = mii_nway_result(lpa & advertise);
                duplex = (media & ADVERTISE_FULL) ? 1 : 0;
                if (lpa2 & LPA_1000FULL)
                        duplex = 1;

                if (lpa2 & (LPA_1000FULL | LPA_1000HALF))
                        speed = 1000;
                else {
                        if (media & (ADVERTISE_100FULL | ADVERTISE_100HALF))
                                speed = 100;
                        else
                                speed = 10;
                }

                dev_info(&priv->pdev->dev,
                         "link UP on %s, %dMbps, %s-duplex\n",
                         port->name, speed, duplex ? "full" : "half");

                override = ENETSW_PORTOV_ENABLE_MASK |
                        ENETSW_PORTOV_LINKUP_MASK;

                if (speed == 1000)
                        override |= ENETSW_IMPOV_1000_MASK;
                else if (speed == 100)
                        override |= ENETSW_IMPOV_100_MASK;
                if (duplex)
                        override |= ENETSW_IMPOV_FDX_MASK;

                enetsw_writeb(priv, override, ENETSW_PORTOV_REG(i));
                enetsw_writeb(priv, 0, ENETSW_PTCTRL_REG(i));
        }

        priv->swphy_poll.expires = jiffies + HZ;
        add_timer(&priv->swphy_poll);
}

/*
 * open callback, allocate dma rings & buffers and start rx operation
 */
static int bcm_enetsw_open(struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct device *kdev;
        int i, ret;
        unsigned int size;
        void *p;
        u32 val;

        priv = netdev_priv(dev);
        kdev = &priv->pdev->dev;

        /* mask all interrupts and request them */
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);

        ret = request_irq(priv->irq_rx, bcm_enet_isr_dma,
                          IRQF_DISABLED, dev->name, dev);
        if (ret)
                goto out_freeirq;

        if (priv->irq_tx != -1) {
                ret = request_irq(priv->irq_tx, bcm_enet_isr_dma,
                                  IRQF_DISABLED, dev->name, dev);
                if (ret)
                        goto out_freeirq_rx;
        }

        /* allocate rx dma ring */
        size = priv->rx_ring_size * sizeof(struct bcm_enet_desc);
        p = dma_alloc_coherent(kdev, size, &priv->rx_desc_dma, GFP_KERNEL);
        if (!p) {
                dev_err(kdev, "cannot allocate rx ring %u\n", size);
                ret = -ENOMEM;
                goto out_freeirq_tx;
        }

        memset(p, 0, size);
        priv->rx_desc_alloc_size = size;
        priv->rx_desc_cpu = p;

        /* allocate tx dma ring */
        size = priv->tx_ring_size * sizeof(struct bcm_enet_desc);
        p = dma_alloc_coherent(kdev, size, &priv->tx_desc_dma, GFP_KERNEL);
        if (!p) {
                dev_err(kdev, "cannot allocate tx ring\n");
                ret = -ENOMEM;
                goto out_free_rx_ring;
        }

        memset(p, 0, size);
        priv->tx_desc_alloc_size = size;
        priv->tx_desc_cpu = p;

        priv->tx_skb = kzalloc(sizeof(struct sk_buff *) * priv->tx_ring_size,
                               GFP_KERNEL);
        if (!priv->tx_skb) {
                dev_err(kdev, "cannot allocate rx skb queue\n");
                ret = -ENOMEM;
                goto out_free_tx_ring;
        }

        priv->tx_desc_count = priv->tx_ring_size;
        priv->tx_dirty_desc = 0;
        priv->tx_curr_desc = 0;
        spin_lock_init(&priv->tx_lock);

        /* init & fill rx ring with skbs */
        priv->rx_skb = kzalloc(sizeof(struct sk_buff *) * priv->rx_ring_size,
                               GFP_KERNEL);
        if (!priv->rx_skb) {
                dev_err(kdev, "cannot allocate rx skb queue\n");
                ret = -ENOMEM;
                goto out_free_tx_skb;
        }

        priv->rx_desc_count = 0;
        priv->rx_dirty_desc = 0;
        priv->rx_curr_desc = 0;

        /* disable all ports */
        for (i = 0; i < priv->num_ports; i++) {
                enetsw_writeb(priv, ENETSW_PORTOV_ENABLE_MASK,
                              ENETSW_PORTOV_REG(i));
                enetsw_writeb(priv, ENETSW_PTCTRL_RXDIS_MASK |
                              ENETSW_PTCTRL_TXDIS_MASK,
                              ENETSW_PTCTRL_REG(i));

                priv->sw_port_link[i] = 0;
        }

        /* reset mib */
        val = enetsw_readb(priv, ENETSW_GMCR_REG);
        val |= ENETSW_GMCR_RST_MIB_MASK;
        enetsw_writeb(priv, val, ENETSW_GMCR_REG);
        mdelay(1);
        val &= ~ENETSW_GMCR_RST_MIB_MASK;
        enetsw_writeb(priv, val, ENETSW_GMCR_REG);
        mdelay(1);

        /* force CPU port state */
        val = enetsw_readb(priv, ENETSW_IMPOV_REG);
        val |= ENETSW_IMPOV_FORCE_MASK | ENETSW_IMPOV_LINKUP_MASK;
        enetsw_writeb(priv, val, ENETSW_IMPOV_REG);

        /* enable switch forward engine */
        val = enetsw_readb(priv, ENETSW_SWMODE_REG);
        val |= ENETSW_SWMODE_FWD_EN_MASK;
        enetsw_writeb(priv, val, ENETSW_SWMODE_REG);

        /* enable jumbo on all ports */
        enetsw_writel(priv, 0x1ff, ENETSW_JMBCTL_PORT_REG);
        enetsw_writew(priv, 9728, ENETSW_JMBCTL_MAXSIZE_REG);

        /* initialize flow control buffer allocation */
        enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
                        ENETDMA_BUFALLOC_REG(priv->rx_chan));

        if (bcm_enet_refill_rx(dev)) {
                dev_err(kdev, "cannot allocate rx skb queue\n");
                ret = -ENOMEM;
                goto out;
        }

        /* write rx & tx ring addresses */
        enet_dmas_writel(priv, priv->rx_desc_dma,
                         ENETDMAS_RSTART_REG, priv->rx_chan);
        enet_dmas_writel(priv, priv->tx_desc_dma,
                         ENETDMAS_RSTART_REG, priv->tx_chan);

        /* clear remaining state ram for rx & tx channel */
        enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->rx_chan);
        enet_dmas_writel(priv, 0, ENETDMAS_SRAM2_REG, priv->tx_chan);
        enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->rx_chan);
        enet_dmas_writel(priv, 0, ENETDMAS_SRAM3_REG, priv->tx_chan);
        enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->rx_chan);
        enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG, priv->tx_chan);

        /* set dma maximum burst len */
        enet_dmac_writel(priv, priv->dma_maxburst,
                         ENETDMAC_MAXBURST, priv->rx_chan);
        enet_dmac_writel(priv, priv->dma_maxburst,
                         ENETDMAC_MAXBURST, priv->tx_chan);

        /* set flow control low/high threshold to 1/3 / 2/3 */
        val = priv->rx_ring_size / 3;
        enet_dma_writel(priv, val, ENETDMA_FLOWCL_REG(priv->rx_chan));
        val = (priv->rx_ring_size * 2) / 3;
        enet_dma_writel(priv, val, ENETDMA_FLOWCH_REG(priv->rx_chan));

        /* all set, enable mac and interrupts, start dma engine and
         * kick rx dma channel
         */
        wmb();
        enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG);
        enet_dmac_writel(priv, ENETDMAC_CHANCFG_EN_MASK,
                         ENETDMAC_CHANCFG, priv->rx_chan);

        /* watch "packet transferred" interrupt in rx and tx */
        enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
                         ENETDMAC_IR, priv->rx_chan);
        enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
                         ENETDMAC_IR, priv->tx_chan);

        /* make sure we enable napi before rx interrupt  */
        napi_enable(&priv->napi);

        enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
                         ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
                         ENETDMAC_IRMASK, priv->tx_chan);

        netif_carrier_on(dev);
        netif_start_queue(dev);

        /* apply override config for bypass_link ports here. */
        for (i = 0; i < priv->num_ports; i++) {
                struct bcm63xx_enetsw_port *port;
                u8 override;
                port = &priv->used_ports[i];
                if (!port->used)
                        continue;

                if (!port->bypass_link)
                        continue;

                override = ENETSW_PORTOV_ENABLE_MASK |
                        ENETSW_PORTOV_LINKUP_MASK;

                switch (port->force_speed) {
                case 1000:
                        override |= ENETSW_IMPOV_1000_MASK;
                        break;
                case 100:
                        override |= ENETSW_IMPOV_100_MASK;
                        break;
                case 10:
                        break;
                default:
                        pr_warn("invalid forced speed on port %s: assume 10\n",
                               port->name);
                        break;
                }

                if (port->force_duplex_full)
                        override |= ENETSW_IMPOV_FDX_MASK;


                enetsw_writeb(priv, override, ENETSW_PORTOV_REG(i));
                enetsw_writeb(priv, 0, ENETSW_PTCTRL_REG(i));
        }

        /* start phy polling timer */
        init_timer(&priv->swphy_poll);
        priv->swphy_poll.function = swphy_poll_timer;
        priv->swphy_poll.data = (unsigned long)priv;
        priv->swphy_poll.expires = jiffies;
        add_timer(&priv->swphy_poll);
        return 0;

out:
        for (i = 0; i < priv->rx_ring_size; i++) {
                struct bcm_enet_desc *desc;

                if (!priv->rx_skb[i])
                        continue;

                desc = &priv->rx_desc_cpu[i];
                dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
                                 DMA_FROM_DEVICE);
                kfree_skb(priv->rx_skb[i]);
        }
        kfree(priv->rx_skb);

out_free_tx_skb:
        kfree(priv->tx_skb);

out_free_tx_ring:
        dma_free_coherent(kdev, priv->tx_desc_alloc_size,
                          priv->tx_desc_cpu, priv->tx_desc_dma);

out_free_rx_ring:
        dma_free_coherent(kdev, priv->rx_desc_alloc_size,
                          priv->rx_desc_cpu, priv->rx_desc_dma);

out_freeirq_tx:
        if (priv->irq_tx != -1)
                free_irq(priv->irq_tx, dev);

out_freeirq_rx:
        free_irq(priv->irq_rx, dev);

out_freeirq:
        return ret;
}

/* stop callback */
static int bcm_enetsw_stop(struct net_device *dev)
{
        struct bcm_enet_priv *priv;
        struct device *kdev;
        int i;

        priv = netdev_priv(dev);
        kdev = &priv->pdev->dev;

        del_timer_sync(&priv->swphy_poll);
        netif_stop_queue(dev);
        napi_disable(&priv->napi);
        del_timer_sync(&priv->rx_timeout);

        /* mask all interrupts */
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->rx_chan);
        enet_dmac_writel(priv, 0, ENETDMAC_IRMASK, priv->tx_chan);

        /* disable dma & mac */
        bcm_enet_disable_dma(priv, priv->tx_chan);
        bcm_enet_disable_dma(priv, priv->rx_chan);

        /* force reclaim of all tx buffers */
        bcm_enet_tx_reclaim(dev, 1);

        /* free the rx skb ring */
        for (i = 0; i < priv->rx_ring_size; i++) {
                struct bcm_enet_desc *desc;

                if (!priv->rx_skb[i])
                        continue;

                desc = &priv->rx_desc_cpu[i];
                dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
                                 DMA_FROM_DEVICE);
                kfree_skb(priv->rx_skb[i]);
        }

        /* free remaining allocated memory */
        kfree(priv->rx_skb);
        kfree(priv->tx_skb);
        dma_free_coherent(kdev, priv->rx_desc_alloc_size,
                          priv->rx_desc_cpu, priv->rx_desc_dma);
        dma_free_coherent(kdev, priv->tx_desc_alloc_size,
                          priv->tx_desc_cpu, priv->tx_desc_dma);
        if (priv->irq_tx != -1)
                free_irq(priv->irq_tx, dev);
        free_irq(priv->irq_rx, dev);

        return 0;
}

/* try to sort out phy external status by walking the used_port field
 * in the bcm_enet_priv structure. in case the phy address is not
 * assigned to any physical port on the switch, assume it is external
 * (and yell at the user).
 */
static int bcm_enetsw_phy_is_external(struct bcm_enet_priv *priv, int phy_id)
{
        int i;

        for (i = 0; i < priv->num_ports; ++i) {
                if (!priv->used_ports[i].used)
                        continue;
                if (priv->used_ports[i].phy_id == phy_id)
                        return bcm_enet_port_is_rgmii(i);
        }

        printk_once(KERN_WARNING  "bcm63xx_enet: could not find a used port with phy_id %i, assuming phy is external\n",
                    phy_id);
        return 1;
}

/* can't use bcmenet_sw_mdio_read directly as we need to sort out
 * external/internal status of the given phy_id first.
 */
static int bcm_enetsw_mii_mdio_read(struct net_device *dev, int phy_id,
                                    int location)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        return bcmenet_sw_mdio_read(priv,
                                    bcm_enetsw_phy_is_external(priv, phy_id),
                                    phy_id, location);
}

/* can't use bcmenet_sw_mdio_write directly as we need to sort out
 * external/internal status of the given phy_id first.
 */
static void bcm_enetsw_mii_mdio_write(struct net_device *dev, int phy_id,
                                      int location,
                                      int val)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);
        bcmenet_sw_mdio_write(priv, bcm_enetsw_phy_is_external(priv, phy_id),
                              phy_id, location, val);
}

static int bcm_enetsw_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct mii_if_info mii;

        mii.dev = dev;
        mii.mdio_read = bcm_enetsw_mii_mdio_read;
        mii.mdio_write = bcm_enetsw_mii_mdio_write;
        mii.phy_id = 0;
        mii.phy_id_mask = 0x3f;
        mii.reg_num_mask = 0x1f;
        return generic_mii_ioctl(&mii, if_mii(rq), cmd, NULL);

}

static const struct net_device_ops bcm_enetsw_ops = {
        .ndo_open               = bcm_enetsw_open,
        .ndo_stop               = bcm_enetsw_stop,
        .ndo_start_xmit         = bcm_enet_start_xmit,
        .ndo_change_mtu         = bcm_enet_change_mtu,
        .ndo_do_ioctl           = bcm_enetsw_ioctl,
};


static const struct bcm_enet_stats bcm_enetsw_gstrings_stats[] = {
        { "rx_packets", DEV_STAT(rx_packets), -1 },
        { "tx_packets", DEV_STAT(tx_packets), -1 },
        { "rx_bytes", DEV_STAT(rx_bytes), -1 },
        { "tx_bytes", DEV_STAT(tx_bytes), -1 },
        { "rx_errors", DEV_STAT(rx_errors), -1 },
        { "tx_errors", DEV_STAT(tx_errors), -1 },
        { "rx_dropped", DEV_STAT(rx_dropped), -1 },
        { "tx_dropped", DEV_STAT(tx_dropped), -1 },

        { "tx_good_octets", GEN_STAT(mib.tx_gd_octets), ETHSW_MIB_RX_GD_OCT },
        { "tx_unicast", GEN_STAT(mib.tx_unicast), ETHSW_MIB_RX_BRDCAST },
        { "tx_broadcast", GEN_STAT(mib.tx_brdcast), ETHSW_MIB_RX_BRDCAST },
        { "tx_multicast", GEN_STAT(mib.tx_mult), ETHSW_MIB_RX_MULT },
        { "tx_64_octets", GEN_STAT(mib.tx_64), ETHSW_MIB_RX_64 },
        { "tx_65_127_oct", GEN_STAT(mib.tx_65_127), ETHSW_MIB_RX_65_127 },
        { "tx_128_255_oct", GEN_STAT(mib.tx_128_255), ETHSW_MIB_RX_128_255 },
        { "tx_256_511_oct", GEN_STAT(mib.tx_256_511), ETHSW_MIB_RX_256_511 },
        { "tx_512_1023_oct", GEN_STAT(mib.tx_512_1023), ETHSW_MIB_RX_512_1023},
        { "tx_1024_1522_oct", GEN_STAT(mib.tx_1024_max),
          ETHSW_MIB_RX_1024_1522 },
        { "tx_1523_2047_oct", GEN_STAT(mib.tx_1523_2047),
          ETHSW_MIB_RX_1523_2047 },
        { "tx_2048_4095_oct", GEN_STAT(mib.tx_2048_4095),
          ETHSW_MIB_RX_2048_4095 },
        { "tx_4096_8191_oct", GEN_STAT(mib.tx_4096_8191),
          ETHSW_MIB_RX_4096_8191 },
        { "tx_8192_9728_oct", GEN_STAT(mib.tx_8192_9728),
          ETHSW_MIB_RX_8192_9728 },
        { "tx_oversize", GEN_STAT(mib.tx_ovr), ETHSW_MIB_RX_OVR },
        { "tx_oversize_drop", GEN_STAT(mib.tx_ovr), ETHSW_MIB_RX_OVR_DISC },
        { "tx_dropped", GEN_STAT(mib.tx_drop), ETHSW_MIB_RX_DROP },
        { "tx_undersize", GEN_STAT(mib.tx_underrun), ETHSW_MIB_RX_UND },
        { "tx_pause", GEN_STAT(mib.tx_pause), ETHSW_MIB_RX_PAUSE },

        { "rx_good_octets", GEN_STAT(mib.rx_gd_octets), ETHSW_MIB_TX_ALL_OCT },
        { "rx_broadcast", GEN_STAT(mib.rx_brdcast), ETHSW_MIB_TX_BRDCAST },
        { "rx_multicast", GEN_STAT(mib.rx_mult), ETHSW_MIB_TX_MULT },
        { "rx_unicast", GEN_STAT(mib.rx_unicast), ETHSW_MIB_TX_MULT },
        { "rx_pause", GEN_STAT(mib.rx_pause), ETHSW_MIB_TX_PAUSE },
        { "rx_dropped", GEN_STAT(mib.rx_drop), ETHSW_MIB_TX_DROP_PKTS },

};

#define BCM_ENETSW_STATS_LEN    \
        (sizeof(bcm_enetsw_gstrings_stats) / sizeof(struct bcm_enet_stats))

static void bcm_enetsw_get_strings(struct net_device *netdev,
                                   u32 stringset, u8 *data)
{
        int i;

        switch (stringset) {
        case ETH_SS_STATS:
                for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
                        memcpy(data + i * ETH_GSTRING_LEN,
                               bcm_enetsw_gstrings_stats[i].stat_string,
                               ETH_GSTRING_LEN);
                }
                break;
        }
}

static int bcm_enetsw_get_sset_count(struct net_device *netdev,
                                     int string_set)
{
        switch (string_set) {
        case ETH_SS_STATS:
                return BCM_ENETSW_STATS_LEN;
        default:
                return -EINVAL;
        }
}

static void bcm_enetsw_get_drvinfo(struct net_device *netdev,
                                   struct ethtool_drvinfo *drvinfo)
{
        strncpy(drvinfo->driver, bcm_enet_driver_name, 32);
        strncpy(drvinfo->version, bcm_enet_driver_version, 32);
        strncpy(drvinfo->fw_version, "N/A", 32);
        strncpy(drvinfo->bus_info, "bcm63xx", 32);
        drvinfo->n_stats = BCM_ENETSW_STATS_LEN;
}

static void bcm_enetsw_get_ethtool_stats(struct net_device *netdev,
                                         struct ethtool_stats *stats,
                                         u64 *data)
{
        struct bcm_enet_priv *priv;
        int i;

        priv = netdev_priv(netdev);

        for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
                const struct bcm_enet_stats *s;
                u32 lo, hi;
                char *p;
                int reg;

                s = &bcm_enetsw_gstrings_stats[i];

                reg = s->mib_reg;
                if (reg == -1)
                        continue;

                lo = enetsw_readl(priv, ENETSW_MIB_REG(reg));
                p = (char *)priv + s->stat_offset;

                if (s->sizeof_stat == sizeof(u64)) {
                        hi = enetsw_readl(priv, ENETSW_MIB_REG(reg + 1));
                        *(u64 *)p = ((u64)hi << 32 | lo);
                } else {
                        *(u32 *)p = lo;
                }
        }

        for (i = 0; i < BCM_ENETSW_STATS_LEN; i++) {
                const struct bcm_enet_stats *s;
                char *p;

                s = &bcm_enetsw_gstrings_stats[i];

                if (s->mib_reg == -1)
                        p = (char *)&netdev->stats + s->stat_offset;
                else
                        p = (char *)priv + s->stat_offset;

                data[i] = (s->sizeof_stat == sizeof(u64)) ?
                        *(u64 *)p : *(u32 *)p;
        }
}

static void bcm_enetsw_get_ringparam(struct net_device *dev,
                                     struct ethtool_ringparam *ering)
{
        struct bcm_enet_priv *priv;

        priv = netdev_priv(dev);

        /* rx/tx ring is actually only limited by memory */
        ering->rx_max_pending = 8192;
        ering->tx_max_pending = 8192;
        ering->rx_mini_max_pending = 0;
        ering->rx_jumbo_max_pending = 0;
        ering->rx_pending = priv->rx_ring_size;
        ering->tx_pending = priv->tx_ring_size;
}

static int bcm_enetsw_set_ringparam(struct net_device *dev,
                                    struct ethtool_ringparam *ering)
{
        struct bcm_enet_priv *priv;
        int was_running;

        priv = netdev_priv(dev);

        was_running = 0;
        if (netif_running(dev)) {
                bcm_enetsw_stop(dev);
                was_running = 1;
        }

        priv->rx_ring_size = ering->rx_pending;
        priv->tx_ring_size = ering->tx_pending;

        if (was_running) {
                int err;

                err = bcm_enetsw_open(dev);
                if (err)
                        dev_close(dev);
        }
        return 0;
}

static struct ethtool_ops bcm_enetsw_ethtool_ops = {
        .get_strings            = bcm_enetsw_get_strings,
        .get_sset_count         = bcm_enetsw_get_sset_count,
        .get_ethtool_stats      = bcm_enetsw_get_ethtool_stats,
        .get_drvinfo            = bcm_enetsw_get_drvinfo,
        .get_ringparam          = bcm_enetsw_get_ringparam,
        .set_ringparam          = bcm_enetsw_set_ringparam,
};

/* allocate netdevice, request register memory and register device. */
static int bcm_enetsw_probe(struct platform_device *pdev)
{
        struct bcm_enet_priv *priv;
        struct net_device *dev;
        struct bcm63xx_enetsw_platform_data *pd;
        struct resource *res_mem;
        int ret, irq_rx, irq_tx;

        /* stop if shared driver failed, assume driver->probe will be
         * called in the same order we register devices (correct ?)
         */
        if (!bcm_enet_shared_base[0])
                return -ENODEV;

        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        irq_rx = platform_get_irq(pdev, 0);
        irq_tx = platform_get_irq(pdev, 1);
        if (!res_mem || irq_rx < 0)
                return -ENODEV;

        ret = 0;
        dev = alloc_etherdev(sizeof(*priv));
        if (!dev)
                return -ENOMEM;
        priv = netdev_priv(dev);
        memset(priv, 0, sizeof(*priv));

        /* initialize default and fetch platform data */
        priv->enet_is_sw = true;
        priv->irq_rx = irq_rx;
        priv->irq_tx = irq_tx;
        priv->rx_ring_size = BCMENET_DEF_RX_DESC;
        priv->tx_ring_size = BCMENET_DEF_TX_DESC;
        priv->dma_maxburst = BCMENETSW_DMA_MAXBURST;

        pd = pdev->dev.platform_data;
        if (pd) {
                memcpy(dev->dev_addr, pd->mac_addr, ETH_ALEN);
                memcpy(priv->used_ports, pd->used_ports,
                       sizeof(pd->used_ports));
                priv->num_ports = pd->num_ports;
                priv->dma_has_sram = pd->dma_has_sram;
                priv->dma_chan_en_mask = pd->dma_chan_en_mask;
                priv->dma_chan_int_mask = pd->dma_chan_int_mask;
                priv->dma_chan_width = pd->dma_chan_width;
        }

        ret = compute_hw_mtu(priv, dev->mtu);
        if (ret)
                goto out;

        if (!request_mem_region(res_mem->start, resource_size(res_mem),
                                "bcm63xx_enetsw")) {
                ret = -EBUSY;
                goto out;
        }

        priv->base = ioremap(res_mem->start, resource_size(res_mem));
        if (priv->base == NULL) {
                ret = -ENOMEM;
                goto out_release_mem;
        }

        priv->mac_clk = clk_get(&pdev->dev, "enetsw");
        if (IS_ERR(priv->mac_clk)) {
                ret = PTR_ERR(priv->mac_clk);
                goto out_unmap;
        }
        clk_enable(priv->mac_clk);

        priv->rx_chan = 0;
        priv->tx_chan = 1;
        spin_lock_init(&priv->rx_lock);

        /* init rx timeout (used for oom) */
        init_timer(&priv->rx_timeout);
        priv->rx_timeout.function = bcm_enet_refill_rx_timer;
        priv->rx_timeout.data = (unsigned long)dev;

        /* register netdevice */
        dev->netdev_ops = &bcm_enetsw_ops;
        netif_napi_add(dev, &priv->napi, bcm_enet_poll, 16);
        SET_ETHTOOL_OPS(dev, &bcm_enetsw_ethtool_ops);
        SET_NETDEV_DEV(dev, &pdev->dev);

        spin_lock_init(&priv->enetsw_mdio_lock);

        ret = register_netdev(dev);
        if (ret)
                goto out_put_clk;

        netif_carrier_off(dev);
        platform_set_drvdata(pdev, dev);
        priv->pdev = pdev;
        priv->net_dev = dev;

        return 0;

out_put_clk:
        clk_put(priv->mac_clk);

out_unmap:
        iounmap(priv->base);

out_release_mem:
        release_mem_region(res_mem->start, resource_size(res_mem));
out:
        free_netdev(dev);
        return ret;
}


/* exit func, stops hardware and unregisters netdevice */
static int bcm_enetsw_remove(struct platform_device *pdev)
{
        struct bcm_enet_priv *priv;
        struct net_device *dev;
        struct resource *res;

        /* stop netdevice */
        dev = platform_get_drvdata(pdev);
        priv = netdev_priv(dev);
        unregister_netdev(dev);

        /* release device resources */
        iounmap(priv->base);
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        release_mem_region(res->start, resource_size(res));

        platform_set_drvdata(pdev, NULL);
        free_netdev(dev);
        return 0;
}

struct platform_driver bcm63xx_enetsw_driver = {
        .probe  = bcm_enetsw_probe,
        .remove = bcm_enetsw_remove,
        .driver = {
                .name   = "bcm63xx_enetsw",
                .owner  = THIS_MODULE,
        },
};

/* reserve & remap memory space shared between all macs */
static int bcm_enet_shared_probe(struct platform_device *pdev)
{
        struct resource *res;
        void __iomem *p[3];
        unsigned int i;

        memset(bcm_enet_shared_base, 0, sizeof(bcm_enet_shared_base));

        for (i = 0; i < 3; i++) {
                res = platform_get_resource(pdev, IORESOURCE_MEM, i);
                p[i] = devm_ioremap_resource(&pdev->dev, res);
                if (IS_ERR(p[i]))
                        return PTR_ERR(p[i]);
        }

        memcpy(bcm_enet_shared_base, p, sizeof(bcm_enet_shared_base));

        return 0;
}

static int bcm_enet_shared_remove(struct platform_device *pdev)
{
        return 0;
}

/* this "shared" driver is needed because both macs share a single
 * address space
 */
struct platform_driver bcm63xx_enet_shared_driver = {
        .probe  = bcm_enet_shared_probe,
        .remove = bcm_enet_shared_remove,
        .driver = {
                .name   = "bcm63xx_enet_shared",
                .owner  = THIS_MODULE,
        },
};

/* entry point */
static int __init bcm_enet_init(void)
{
        int ret;

        ret = platform_driver_register(&bcm63xx_enet_shared_driver);
        if (ret)
                return ret;

        ret = platform_driver_register(&bcm63xx_enet_driver);
        if (ret)
                platform_driver_unregister(&bcm63xx_enet_shared_driver);

        ret = platform_driver_register(&bcm63xx_enetsw_driver);
        if (ret) {
                platform_driver_unregister(&bcm63xx_enet_driver);
                platform_driver_unregister(&bcm63xx_enet_shared_driver);
        }

        return ret;
}

static void __exit bcm_enet_exit(void)
{
        platform_driver_unregister(&bcm63xx_enet_driver);
        platform_driver_unregister(&bcm63xx_enetsw_driver);
        platform_driver_unregister(&bcm63xx_enet_shared_driver);
}


module_init(bcm_enet_init);
module_exit(bcm_enet_exit);

MODULE_DESCRIPTION("BCM63xx internal ethernet mac driver");
MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
MODULE_LICENSE("GPL");