drivers/net/fs_enet/fs_enet-main.c

/*
 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
 *
 * Copyright (c) 2003 Intracom S.A.
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * 2005 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
 * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>

#include <linux/vmalloc.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#include "fs_enet.h"

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

MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
MODULE_DESCRIPTION("Freescale Ethernet Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

static int fs_enet_debug = -1; /* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
module_param(fs_enet_debug, int, 0);
MODULE_PARM_DESC(fs_enet_debug,
		 "Freescale bitmapped debugging message enable value");

#ifdef CONFIG_NET_POLL_CONTROLLER
static void fs_enet_netpoll(struct net_device *dev);
#endif

static void fs_set_multicast_list(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	(*fep->ops->set_multicast_list)(dev);
}

static void skb_align(struct sk_buff *skb, int align)
{
	int off = ((unsigned long)skb->data) & (align - 1);

	if (off)
		skb_reserve(skb, align - off);
}

/* NAPI receive function */
static int fs_enet_rx_napi(struct napi_struct *napi, int budget)
{
	struct fs_enet_private *fep = container_of(napi, struct fs_enet_private, napi);
	struct net_device *dev = fep->ndev;
	const struct fs_platform_info *fpi = fep->fpi;
	cbd_t __iomem *bdp;
	struct sk_buff *skb, *skbn, *skbt;
	int received = 0;
	u16 pkt_len, sc;
	int curidx;

	/*
	 * First, grab all of the stats for the incoming packet.
	 * These get messed up if we get called due to a busy condition.
	 */
	bdp = fep->cur_rx;

	/* clear RX status bits for napi*/
	(*fep->ops->napi_clear_rx_event)(dev);

	while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {
		curidx = bdp - fep->rx_bd_base;

		/*
		 * Since we have allocated space to hold a complete frame,
		 * the last indicator should be set.
		 */
		if ((sc & BD_ENET_RX_LAST) == 0)
			printk(KERN_WARNING DRV_MODULE_NAME
			       ": %s rcv is not +last\n",
			       dev->name);

		/*
		 * Check for errors.
		 */
		if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
			  BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
			fep->stats.rx_errors++;
			/* Frame too long or too short. */
			if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
				fep->stats.rx_length_errors++;
			/* Frame alignment */
			if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
				fep->stats.rx_frame_errors++;
			/* CRC Error */
			if (sc & BD_ENET_RX_CR)
				fep->stats.rx_crc_errors++;
			/* FIFO overrun */
			if (sc & BD_ENET_RX_OV)
				fep->stats.rx_crc_errors++;

			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			skbn = skb;

		} else {
			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			/*
			 * Process the incoming frame.
			 */
			fep->stats.rx_packets++;
			pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
			fep->stats.rx_bytes += pkt_len + 4;

			if (pkt_len <= fpi->rx_copybreak) {
				/* +2 to make IP header L1 cache aligned */
				skbn = dev_alloc_skb(pkt_len + 2);
				if (skbn != NULL) {
					skb_reserve(skbn, 2);	/* align IP header */
					skb_copy_from_linear_data(skb,
						      skbn->data, pkt_len);
					/* swap */
					skbt = skb;
					skb = skbn;
					skbn = skbt;
				}
			} else {
				skbn = dev_alloc_skb(ENET_RX_FRSIZE);

				if (skbn)
					skb_align(skbn, ENET_RX_ALIGN);
			}

			if (skbn != NULL) {
				skb_put(skb, pkt_len);	/* Make room */
				skb->protocol = eth_type_trans(skb, dev);
				received++;
				netif_receive_skb(skb);
			} else {
				printk(KERN_WARNING DRV_MODULE_NAME
				       ": %s Memory squeeze, dropping packet.\n",
				       dev->name);
				fep->stats.rx_dropped++;
				skbn = skb;
			}
		}

		fep->rx_skbuff[curidx] = skbn;
		CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
			     L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
			     DMA_FROM_DEVICE));
		CBDW_DATLEN(bdp, 0);
		CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);

		/*
		 * Update BD pointer to next entry.
		 */
		if ((sc & BD_ENET_RX_WRAP) == 0)
			bdp++;
		else
			bdp = fep->rx_bd_base;

		(*fep->ops->rx_bd_done)(dev);

		if (received >= budget)
			break;
	}

	fep->cur_rx = bdp;

	if (received < budget) {
		/* done */
		napi_complete(napi);
		(*fep->ops->napi_enable_rx)(dev);
	}
	return received;
}

/* non NAPI receive function */
static int fs_enet_rx_non_napi(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;
	cbd_t __iomem *bdp;
	struct sk_buff *skb, *skbn, *skbt;
	int received = 0;
	u16 pkt_len, sc;
	int curidx;
	/*
	 * First, grab all of the stats for the incoming packet.
	 * These get messed up if we get called due to a busy condition.
	 */
	bdp = fep->cur_rx;

	while (((sc = CBDR_SC(bdp)) & BD_ENET_RX_EMPTY) == 0) {

		curidx = bdp - fep->rx_bd_base;

		/*
		 * Since we have allocated space to hold a complete frame,
		 * the last indicator should be set.
		 */
		if ((sc & BD_ENET_RX_LAST) == 0)
			printk(KERN_WARNING DRV_MODULE_NAME
			       ": %s rcv is not +last\n",
			       dev->name);

		/*
		 * Check for errors.
		 */
		if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_CL |
			  BD_ENET_RX_NO | BD_ENET_RX_CR | BD_ENET_RX_OV)) {
			fep->stats.rx_errors++;
			/* Frame too long or too short. */
			if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
				fep->stats.rx_length_errors++;
			/* Frame alignment */
			if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
				fep->stats.rx_frame_errors++;
			/* CRC Error */
			if (sc & BD_ENET_RX_CR)
				fep->stats.rx_crc_errors++;
			/* FIFO overrun */
			if (sc & BD_ENET_RX_OV)
				fep->stats.rx_crc_errors++;

			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			skbn = skb;

		} else {

			skb = fep->rx_skbuff[curidx];

			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE);

			/*
			 * Process the incoming frame.
			 */
			fep->stats.rx_packets++;
			pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
			fep->stats.rx_bytes += pkt_len + 4;

			if (pkt_len <= fpi->rx_copybreak) {
				/* +2 to make IP header L1 cache aligned */
				skbn = dev_alloc_skb(pkt_len + 2);
				if (skbn != NULL) {
					skb_reserve(skbn, 2);	/* align IP header */
					skb_copy_from_linear_data(skb,
						      skbn->data, pkt_len);
					/* swap */
					skbt = skb;
					skb = skbn;
					skbn = skbt;
				}
			} else {
				skbn = dev_alloc_skb(ENET_RX_FRSIZE);

				if (skbn)
					skb_align(skbn, ENET_RX_ALIGN);
			}

			if (skbn != NULL) {
				skb_put(skb, pkt_len);	/* Make room */
				skb->protocol = eth_type_trans(skb, dev);
				received++;
				netif_rx(skb);
			} else {
				printk(KERN_WARNING DRV_MODULE_NAME
				       ": %s Memory squeeze, dropping packet.\n",
				       dev->name);
				fep->stats.rx_dropped++;
				skbn = skb;
			}
		}

		fep->rx_skbuff[curidx] = skbn;
		CBDW_BUFADDR(bdp, dma_map_single(fep->dev, skbn->data,
			     L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
			     DMA_FROM_DEVICE));
		CBDW_DATLEN(bdp, 0);
		CBDW_SC(bdp, (sc & ~BD_ENET_RX_STATS) | BD_ENET_RX_EMPTY);

		/*
		 * Update BD pointer to next entry.
		 */
		if ((sc & BD_ENET_RX_WRAP) == 0)
			bdp++;
		else
			bdp = fep->rx_bd_base;

		(*fep->ops->rx_bd_done)(dev);
	}

	fep->cur_rx = bdp;

	return 0;
}

static void fs_enet_tx(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	cbd_t __iomem *bdp;
	struct sk_buff *skb;
	int dirtyidx, do_wake, do_restart;
	u16 sc;

	spin_lock(&fep->tx_lock);
	bdp = fep->dirty_tx;

	do_wake = do_restart = 0;
	while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0) {
		dirtyidx = bdp - fep->tx_bd_base;

		if (fep->tx_free == fep->tx_ring)
			break;

		skb = fep->tx_skbuff[dirtyidx];

		/*
		 * Check for errors.
		 */
		if (sc & (BD_ENET_TX_HB | BD_ENET_TX_LC |
			  BD_ENET_TX_RL | BD_ENET_TX_UN | BD_ENET_TX_CSL)) {

			if (sc & BD_ENET_TX_HB)	/* No heartbeat */
				fep->stats.tx_heartbeat_errors++;
			if (sc & BD_ENET_TX_LC)	/* Late collision */
				fep->stats.tx_window_errors++;
			if (sc & BD_ENET_TX_RL)	/* Retrans limit */
				fep->stats.tx_aborted_errors++;
			if (sc & BD_ENET_TX_UN)	/* Underrun */
				fep->stats.tx_fifo_errors++;
			if (sc & BD_ENET_TX_CSL)	/* Carrier lost */
				fep->stats.tx_carrier_errors++;

			if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
				fep->stats.tx_errors++;
				do_restart = 1;
			}
		} else
			fep->stats.tx_packets++;

		if (sc & BD_ENET_TX_READY)
			printk(KERN_WARNING DRV_MODULE_NAME
			       ": %s HEY! Enet xmit interrupt and TX_READY.\n",
			       dev->name);

		/*
		 * Deferred means some collisions occurred during transmit,
		 * but we eventually sent the packet OK.
		 */
		if (sc & BD_ENET_TX_DEF)
			fep->stats.collisions++;

		/* unmap */
		dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				skb->len, DMA_TO_DEVICE);

		/*
		 * Free the sk buffer associated with this last transmit.
		 */
		dev_kfree_skb_irq(skb);
		fep->tx_skbuff[dirtyidx] = NULL;

		/*
		 * Update pointer to next buffer descriptor to be transmitted.
		 */
		if ((sc & BD_ENET_TX_WRAP) == 0)
			bdp++;
		else
			bdp = fep->tx_bd_base;

		/*
		 * Since we have freed up a buffer, the ring is no longer
		 * full.
		 */
		if (!fep->tx_free++)
			do_wake = 1;
	}

	fep->dirty_tx = bdp;

	if (do_restart)
		(*fep->ops->tx_restart)(dev);

	spin_unlock(&fep->tx_lock);

	if (do_wake)
		netif_wake_queue(dev);
}

/*
 * The interrupt handler.
 * This is called from the MPC core interrupt.
 */
static irqreturn_t
fs_enet_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct fs_enet_private *fep;
	const struct fs_platform_info *fpi;
	u32 int_events;
	u32 int_clr_events;
	int nr, napi_ok;
	int handled;

	fep = netdev_priv(dev);
	fpi = fep->fpi;

	nr = 0;
	while ((int_events = (*fep->ops->get_int_events)(dev)) != 0) {
		nr++;

		int_clr_events = int_events;
		if (fpi->use_napi)
			int_clr_events &= ~fep->ev_napi_rx;

		(*fep->ops->clear_int_events)(dev, int_clr_events);

		if (int_events & fep->ev_err)
			(*fep->ops->ev_error)(dev, int_events);

		if (int_events & fep->ev_rx) {
			if (!fpi->use_napi)
				fs_enet_rx_non_napi(dev);
			else {
				napi_ok = napi_schedule_prep(&fep->napi);

				(*fep->ops->napi_disable_rx)(dev);
				(*fep->ops->clear_int_events)(dev, fep->ev_napi_rx);

				/* NOTE: it is possible for FCCs in NAPI mode    */
				/* to submit a spurious interrupt while in poll  */
				if (napi_ok)
					__napi_schedule(&fep->napi);
			}
		}

		if (int_events & fep->ev_tx)
			fs_enet_tx(dev);
	}

	handled = nr > 0;
	return IRQ_RETVAL(handled);
}

void fs_init_bds(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	cbd_t __iomem *bdp;
	struct sk_buff *skb;
	int i;

	fs_cleanup_bds(dev);

	fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
	fep->tx_free = fep->tx_ring;
	fep->cur_rx = fep->rx_bd_base;

	/*
	 * Initialize the receive buffer descriptors.
	 */
	for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
		skb = dev_alloc_skb(ENET_RX_FRSIZE);
		if (skb == NULL) {
			printk(KERN_WARNING DRV_MODULE_NAME
			       ": %s Memory squeeze, unable to allocate skb\n",
			       dev->name);
			break;
		}
		skb_align(skb, ENET_RX_ALIGN);
		fep->rx_skbuff[i] = skb;
		CBDW_BUFADDR(bdp,
			dma_map_single(fep->dev, skb->data,
				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
				DMA_FROM_DEVICE));
		CBDW_DATLEN(bdp, 0);	/* zero */
		CBDW_SC(bdp, BD_ENET_RX_EMPTY |
			((i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP));
	}
	/*
	 * if we failed, fillup remainder
	 */
	for (; i < fep->rx_ring; i++, bdp++) {
		fep->rx_skbuff[i] = NULL;
		CBDW_SC(bdp, (i < fep->rx_ring - 1) ? 0 : BD_SC_WRAP);
	}

	/*
	 * ...and the same for transmit.
	 */
	for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
		fep->tx_skbuff[i] = NULL;
		CBDW_BUFADDR(bdp, 0);
		CBDW_DATLEN(bdp, 0);
		CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
	}
}

void fs_cleanup_bds(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct sk_buff *skb;
	cbd_t __iomem *bdp;
	int i;

	/*
	 * Reset SKB transmit buffers.
	 */
	for (i = 0, bdp = fep->tx_bd_base; i < fep->tx_ring; i++, bdp++) {
		if ((skb = fep->tx_skbuff[i]) == NULL)
			continue;

		/* unmap */
		dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
				skb->len, DMA_TO_DEVICE);

		fep->tx_skbuff[i] = NULL;
		dev_kfree_skb(skb);
	}

	/*
	 * Reset SKB receive buffers
	 */
	for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
		if ((skb = fep->rx_skbuff[i]) == NULL)
			continue;

		/* unmap */
		dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
			L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
			DMA_FROM_DEVICE);

		fep->rx_skbuff[i] = NULL;

		dev_kfree_skb(skb);
	}
}

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

static int fs_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	cbd_t __iomem *bdp;
	int curidx;
	u16 sc;
	unsigned long flags;

	spin_lock_irqsave(&fep->tx_lock, flags);

	/*
	 * Fill in a Tx ring entry
	 */
	bdp = fep->cur_tx;

	if (!fep->tx_free || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
		netif_stop_queue(dev);
		spin_unlock_irqrestore(&fep->tx_lock, flags);

		/*
		 * Ooops.  All transmit buffers are full.  Bail out.
		 * This should not happen, since the tx queue should be stopped.
		 */
		printk(KERN_WARNING DRV_MODULE_NAME
		       ": %s tx queue full!.\n", dev->name);
		return NETDEV_TX_BUSY;
	}

	curidx = bdp - fep->tx_bd_base;
	/*
	 * Clear all of the status flags.
	 */
	CBDC_SC(bdp, BD_ENET_TX_STATS);

	/*
	 * Save skb pointer.
	 */
	fep->tx_skbuff[curidx] = skb;

	fep->stats.tx_bytes += skb->len;

	/*
	 * Push the data cache so the CPM does not get stale memory data.
	 */
	CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
				skb->data, skb->len, DMA_TO_DEVICE));
	CBDW_DATLEN(bdp, skb->len);

	dev->trans_start = jiffies;

	/*
	 * If this was the last BD in the ring, start at the beginning again.
	 */
	if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
		fep->cur_tx++;
	else
		fep->cur_tx = fep->tx_bd_base;

	if (!--fep->tx_free)
		netif_stop_queue(dev);

	/* Trigger transmission start */
	sc = BD_ENET_TX_READY | BD_ENET_TX_INTR |
	     BD_ENET_TX_LAST | BD_ENET_TX_TC;

	/* note that while FEC does not have this bit
	 * it marks it as available for software use
	 * yay for hw reuse :) */
	if (skb->len <= 60)
		sc |= BD_ENET_TX_PAD;
	CBDS_SC(bdp, sc);

	(*fep->ops->tx_kickstart)(dev);

	spin_unlock_irqrestore(&fep->tx_lock, flags);

	return NETDEV_TX_OK;
}

static void fs_timeout(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	unsigned long flags;
	int wake = 0;

	fep->stats.tx_errors++;

	spin_lock_irqsave(&fep->lock, flags);

	if (dev->flags & IFF_UP) {
		phy_stop(fep->phydev);
		(*fep->ops->stop)(dev);
		(*fep->ops->restart)(dev);
		phy_start(fep->phydev);
	}

	phy_start(fep->phydev);
	wake = fep->tx_free && !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
	spin_unlock_irqrestore(&fep->lock, flags);

	if (wake)
		netif_wake_queue(dev);
}

/*-----------------------------------------------------------------------------
 *  generic link-change handler - should be sufficient for most cases
 *-----------------------------------------------------------------------------*/
static void generic_adjust_link(struct  net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct phy_device *phydev = fep->phydev;
	int new_state = 0;

	if (phydev->link) {
		/* adjust to duplex mode */
		if (phydev->duplex != fep->oldduplex) {
			new_state = 1;
			fep->oldduplex = phydev->duplex;
		}

		if (phydev->speed != fep->oldspeed) {
			new_state = 1;
			fep->oldspeed = phydev->speed;
		}

		if (!fep->oldlink) {
			new_state = 1;
			fep->oldlink = 1;
		}

		if (new_state)
			fep->ops->restart(dev);
	} else if (fep->oldlink) {
		new_state = 1;
		fep->oldlink = 0;
		fep->oldspeed = 0;
		fep->oldduplex = -1;
	}

	if (new_state && netif_msg_link(fep))
		phy_print_status(phydev);
}


static void fs_adjust_link(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&fep->lock, flags);

	if(fep->ops->adjust_link)
		fep->ops->adjust_link(dev);
	else
		generic_adjust_link(dev);

	spin_unlock_irqrestore(&fep->lock, flags);
}

static int fs_init_phy(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct phy_device *phydev;

	fep->oldlink = 0;
	fep->oldspeed = 0;
	fep->oldduplex = -1;
	if(fep->fpi->bus_id)
		phydev = phy_connect(dev, fep->fpi->bus_id, &fs_adjust_link, 0,
				PHY_INTERFACE_MODE_MII);
	else {
		printk("No phy bus ID specified in BSP code\n");
		return -EINVAL;
	}
	if (IS_ERR(phydev)) {
		printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
		return PTR_ERR(phydev);
	}

	fep->phydev = phydev;

	return 0;
}

static int fs_enet_open(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	int r;
	int err;

	/* to initialize the fep->cur_rx,... */
	/* not doing this, will cause a crash in fs_enet_rx_napi */
	fs_init_bds(fep->ndev);

	if (fep->fpi->use_napi)
		napi_enable(&fep->napi);

	/* Install our interrupt handler. */
	r = request_irq(fep->interrupt, fs_enet_interrupt, IRQF_SHARED,
			"fs_enet-mac", dev);
	if (r != 0) {
		printk(KERN_ERR DRV_MODULE_NAME
		       ": %s Could not allocate FS_ENET IRQ!", dev->name);
		if (fep->fpi->use_napi)
			napi_disable(&fep->napi);
		return -EINVAL;
	}

	err = fs_init_phy(dev);
	if (err) {
		free_irq(fep->interrupt, dev);
		if (fep->fpi->use_napi)
			napi_disable(&fep->napi);
		return err;
	}
	phy_start(fep->phydev);

	netif_start_queue(dev);

	return 0;
}

static int fs_enet_close(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	unsigned long flags;

	netif_stop_queue(dev);
	netif_carrier_off(dev);
	if (fep->fpi->use_napi)
		napi_disable(&fep->napi);
	phy_stop(fep->phydev);

	spin_lock_irqsave(&fep->lock, flags);
	spin_lock(&fep->tx_lock);
	(*fep->ops->stop)(dev);
	spin_unlock(&fep->tx_lock);
	spin_unlock_irqrestore(&fep->lock, flags);

	/* release any irqs */
	phy_disconnect(fep->phydev);
	fep->phydev = NULL;
	free_irq(fep->interrupt, dev);

	return 0;
}

static struct net_device_stats *fs_enet_get_stats(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	return &fep->stats;
}

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

static void fs_get_drvinfo(struct net_device *dev,
			    struct ethtool_drvinfo *info)
{
	strcpy(info->driver, DRV_MODULE_NAME);
	strcpy(info->version, DRV_MODULE_VERSION);
}

static int fs_get_regs_len(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	return (*fep->ops->get_regs_len)(dev);
}

static void fs_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			 void *p)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	unsigned long flags;
	int r, len;

	len = regs->len;

	spin_lock_irqsave(&fep->lock, flags);
	r = (*fep->ops->get_regs)(dev, p, &len);
	spin_unlock_irqrestore(&fep->lock, flags);

	if (r == 0)
		regs->version = 0;
}

static int fs_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (!fep->phydev)
		return -ENODEV;

	return phy_ethtool_gset(fep->phydev, cmd);
}

static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (!fep->phydev)
		return -ENODEV;

	return phy_ethtool_sset(fep->phydev, cmd);
}

static int fs_nway_reset(struct net_device *dev)
{
	return 0;
}

static u32 fs_get_msglevel(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	return fep->msg_enable;
}

static void fs_set_msglevel(struct net_device *dev, u32 value)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	fep->msg_enable = value;
}

static const struct ethtool_ops fs_ethtool_ops = {
	.get_drvinfo = fs_get_drvinfo,
	.get_regs_len = fs_get_regs_len,
	.get_settings = fs_get_settings,
	.set_settings = fs_set_settings,
	.nway_reset = fs_nway_reset,
	.get_link = ethtool_op_get_link,
	.get_msglevel = fs_get_msglevel,
	.set_msglevel = fs_set_msglevel,
	.set_tx_csum = ethtool_op_set_tx_csum,	/* local! */
	.set_sg = ethtool_op_set_sg,
	.get_regs = fs_get_regs,
};

static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct mii_ioctl_data *mii = (struct mii_ioctl_data *)&rq->ifr_data;

	if (!netif_running(dev))
		return -EINVAL;

	return phy_mii_ioctl(fep->phydev, mii, cmd);
}

extern int fs_mii_connect(struct net_device *dev);
extern void fs_mii_disconnect(struct net_device *dev);

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

/* handy pointer to the immap */
void __iomem *fs_enet_immap = NULL;

static int setup_immap(void)
{
#ifdef CONFIG_CPM1
	fs_enet_immap = ioremap(IMAP_ADDR, 0x4000);
	WARN_ON(!fs_enet_immap);
#elif defined(CONFIG_CPM2)
	fs_enet_immap = cpm2_immr;
#endif

	return 0;
}

static void cleanup_immap(void)
{
#if defined(CONFIG_CPM1)
	iounmap(fs_enet_immap);
#endif
}

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

static int __devinit find_phy(struct device_node *np,
                              struct fs_platform_info *fpi)
{
	struct device_node *phynode, *mdionode;
	int ret = 0, len, bus_id;
	const u32 *data;

	data  = of_get_property(np, "fixed-link", NULL);
	if (data) {
		snprintf(fpi->bus_id, 16, "%x:%02x", 0, *data);
		return 0;
	}

	data = of_get_property(np, "phy-handle", &len);
	if (!data || len != 4)
		return -EINVAL;

	phynode = of_find_node_by_phandle(*data);
	if (!phynode)
		return -EINVAL;

	data = of_get_property(phynode, "reg", &len);
	if (!data || len != 4) {
		ret = -EINVAL;
		goto out_put_phy;
	}

	mdionode = of_get_parent(phynode);
	if (!mdionode) {
		ret = -EINVAL;
		goto out_put_phy;
	}

	bus_id = of_get_gpio(mdionode, 0);
	if (bus_id < 0) {
		struct resource res;
		ret = of_address_to_resource(mdionode, 0, &res);
		if (ret)
			goto out_put_mdio;
		bus_id = res.start;
	}

	snprintf(fpi->bus_id, 16, "%x:%02x", bus_id, *data);

out_put_mdio:
	of_node_put(mdionode);
out_put_phy:
	of_node_put(phynode);
	return ret;
}

#ifdef CONFIG_FS_ENET_HAS_FEC
#define IS_FEC(match) ((match)->data == &fs_fec_ops)
#else
#define IS_FEC(match) 0
#endif

static int __devinit fs_enet_probe(struct of_device *ofdev,
                                   const struct of_device_id *match)
{
	struct net_device *ndev;
	struct fs_enet_private *fep;
	struct fs_platform_info *fpi;
	const u32 *data;
	const u8 *mac_addr;
	int privsize, len, ret = -ENODEV;

	fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
	if (!fpi)
		return -ENOMEM;

	if (!IS_FEC(match)) {
		data = of_get_property(ofdev->node, "fsl,cpm-command", &len);
		if (!data || len != 4)
			goto out_free_fpi;

		fpi->cp_command = *data;
	}

	fpi->rx_ring = 32;
	fpi->tx_ring = 32;
	fpi->rx_copybreak = 240;
	fpi->use_napi = 1;
	fpi->napi_weight = 17;

	ret = find_phy(ofdev->node, fpi);
	if (ret)
		goto out_free_fpi;

	privsize = sizeof(*fep) +
	           sizeof(struct sk_buff **) *
	           (fpi->rx_ring + fpi->tx_ring);

	ndev = alloc_etherdev(privsize);
	if (!ndev) {
		ret = -ENOMEM;
		goto out_free_fpi;
	}

	dev_set_drvdata(&ofdev->dev, ndev);

	fep = netdev_priv(ndev);
	fep->dev = &ofdev->dev;
	fep->ndev = ndev;
	fep->fpi = fpi;
	fep->ops = match->data;

	ret = fep->ops->setup_data(ndev);
	if (ret)
		goto out_free_dev;

	fep->rx_skbuff = (struct sk_buff **)&fep[1];
	fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;

	spin_lock_init(&fep->lock);
	spin_lock_init(&fep->tx_lock);

	mac_addr = of_get_mac_address(ofdev->node);
	if (mac_addr)
		memcpy(ndev->dev_addr, mac_addr, 6);

	ret = fep->ops->allocate_bd(ndev);
	if (ret)
		goto out_cleanup_data;

	fep->rx_bd_base = fep->ring_base;
	fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;

	fep->tx_ring = fpi->tx_ring;
	fep->rx_ring = fpi->rx_ring;

	ndev->open = fs_enet_open;
	ndev->hard_start_xmit = fs_enet_start_xmit;
	ndev->tx_timeout = fs_timeout;
	ndev->watchdog_timeo = 2 * HZ;
	ndev->stop = fs_enet_close;
	ndev->get_stats = fs_enet_get_stats;
	ndev->set_multicast_list = fs_set_multicast_list;
#ifdef CONFIG_NET_POLL_CONTROLLER
	ndev->poll_controller = fs_enet_netpoll;
#endif
	if (fpi->use_napi)
		netif_napi_add(ndev, &fep->napi, fs_enet_rx_napi,
		               fpi->napi_weight);

	ndev->ethtool_ops = &fs_ethtool_ops;
	ndev->do_ioctl = fs_ioctl;

	init_timer(&fep->phy_timer_list);

	netif_carrier_off(ndev);

	ret = register_netdev(ndev);
	if (ret)
		goto out_free_bd;

	printk(KERN_INFO "%s: fs_enet: %pM\n", ndev->name, ndev->dev_addr);

	return 0;

out_free_bd:
	fep->ops->free_bd(ndev);
out_cleanup_data:
	fep->ops->cleanup_data(ndev);
out_free_dev:
	free_netdev(ndev);
	dev_set_drvdata(&ofdev->dev, NULL);
out_free_fpi:
	kfree(fpi);
	return ret;
}

static int fs_enet_remove(struct of_device *ofdev)
{
	struct net_device *ndev = dev_get_drvdata(&ofdev->dev);
	struct fs_enet_private *fep = netdev_priv(ndev);

	unregister_netdev(ndev);

	fep->ops->free_bd(ndev);
	fep->ops->cleanup_data(ndev);
	dev_set_drvdata(fep->dev, NULL);

	free_netdev(ndev);
	return 0;
}

static struct of_device_id fs_enet_match[] = {
#ifdef CONFIG_FS_ENET_HAS_SCC
	{
		.compatible = "fsl,cpm1-scc-enet",
		.data = (void *)&fs_scc_ops,
	},
	{
		.compatible = "fsl,cpm2-scc-enet",
		.data = (void *)&fs_scc_ops,
	},
#endif
#ifdef CONFIG_FS_ENET_HAS_FCC
	{
		.compatible = "fsl,cpm2-fcc-enet",
		.data = (void *)&fs_fcc_ops,
	},
#endif
#ifdef CONFIG_FS_ENET_HAS_FEC
	{
		.compatible = "fsl,pq1-fec-enet",
		.data = (void *)&fs_fec_ops,
	},
#endif
	{}
};

static struct of_platform_driver fs_enet_driver = {
	.name	= "fs_enet",
	.match_table = fs_enet_match,
	.probe = fs_enet_probe,
	.remove = fs_enet_remove,
};

static int __init fs_init(void)
{
	int r = setup_immap();
	if (r != 0)
		return r;

	r = of_register_platform_driver(&fs_enet_driver);
	if (r != 0)
		goto out;

	return 0;

out:
	cleanup_immap();
	return r;
}

static void __exit fs_cleanup(void)
{
	of_unregister_platform_driver(&fs_enet_driver);
	cleanup_immap();
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void fs_enet_netpoll(struct net_device *dev)
{
       disable_irq(dev->irq);
       fs_enet_interrupt(dev->irq, dev);
       enable_irq(dev->irq);
}
#endif

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

module_init(fs_init);
module_exit(fs_cleanup);