Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1142 insertions, 0 deletions

diff --git a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
new file mode 100644
index 000000000..7c548ed53
--- /dev/null
+++ b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
@@ -0,0 +1,1142 @@
+/*
+ * 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/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.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/of_net.h>
+
+#include <linux/vmalloc.h>
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <linux/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");
+
+#define RX_RING_SIZE	32
+#define TX_RING_SIZE	64
+
+#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 function */
+static int fs_enet_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;
+	int received = 0;
+	u16 pkt_len, sc;
+	int curidx;
+	int dirtyidx, do_wake, do_restart;
+	int tx_left = TX_RING_SIZE;
+
+	spin_lock(&fep->tx_lock);
+	bdp = fep->dirty_tx;
+
+	/* clear status bits for napi*/
+	(*fep->ops->napi_clear_event)(dev);
+
+	do_wake = do_restart = 0;
+	while (((sc = CBDR_SC(bdp)) & BD_ENET_TX_READY) == 0 && tx_left) {
+		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 */
+				dev->stats.tx_heartbeat_errors++;
+			if (sc & BD_ENET_TX_LC)	/* Late collision */
+				dev->stats.tx_window_errors++;
+			if (sc & BD_ENET_TX_RL)	/* Retrans limit */
+				dev->stats.tx_aborted_errors++;
+			if (sc & BD_ENET_TX_UN)	/* Underrun */
+				dev->stats.tx_fifo_errors++;
+			if (sc & BD_ENET_TX_CSL)	/* Carrier lost */
+				dev->stats.tx_carrier_errors++;
+
+			if (sc & (BD_ENET_TX_LC | BD_ENET_TX_RL | BD_ENET_TX_UN)) {
+				dev->stats.tx_errors++;
+				do_restart = 1;
+			}
+		} else
+			dev->stats.tx_packets++;
+
+		if (sc & BD_ENET_TX_READY) {
+			dev_warn(fep->dev,
+				 "HEY! Enet xmit interrupt and TX_READY.\n");
+		}
+
+		/*
+		 * Deferred means some collisions occurred during transmit,
+		 * but we eventually sent the packet OK.
+		 */
+		if (sc & BD_ENET_TX_DEF)
+			dev->stats.collisions++;
+
+		/* unmap */
+		if (fep->mapped_as_page[dirtyidx])
+			dma_unmap_page(fep->dev, CBDR_BUFADDR(bdp),
+				       CBDR_DATLEN(bdp), DMA_TO_DEVICE);
+		else
+			dma_unmap_single(fep->dev, CBDR_BUFADDR(bdp),
+					 CBDR_DATLEN(bdp), DMA_TO_DEVICE);
+
+		/*
+		 * Free the sk buffer associated with this last transmit.
+		 */
+		if (skb) {
+			dev_kfree_skb(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 == MAX_SKB_FRAGS)
+			do_wake = 1;
+		tx_left--;
+	}
+
+	fep->dirty_tx = bdp;
+
+	if (do_restart)
+		(*fep->ops->tx_restart)(dev);
+
+	spin_unlock(&fep->tx_lock);
+
+	if (do_wake)
+		netif_wake_queue(dev);
+
+	/*
+	 * 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 &&
+	       received < budget) {
+		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)
+			dev_warn(fep->dev, "rcv is not +last\n");
+
+		/*
+		 * 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)) {
+			dev->stats.rx_errors++;
+			/* Frame too long or too short. */
+			if (sc & (BD_ENET_RX_LG | BD_ENET_RX_SH))
+				dev->stats.rx_length_errors++;
+			/* Frame alignment */
+			if (sc & (BD_ENET_RX_NO | BD_ENET_RX_CL))
+				dev->stats.rx_frame_errors++;
+			/* CRC Error */
+			if (sc & BD_ENET_RX_CR)
+				dev->stats.rx_crc_errors++;
+			/* FIFO overrun */
+			if (sc & BD_ENET_RX_OV)
+				dev->stats.rx_crc_errors++;
+
+			skbn = fep->rx_skbuff[curidx];
+		} else {
+			skb = fep->rx_skbuff[curidx];
+
+			/*
+			 * Process the incoming frame.
+			 */
+			dev->stats.rx_packets++;
+			pkt_len = CBDR_DATLEN(bdp) - 4;	/* remove CRC */
+			dev->stats.rx_bytes += pkt_len + 4;
+
+			if (pkt_len <= fpi->rx_copybreak) {
+				/* +2 to make IP header L1 cache aligned */
+				skbn = netdev_alloc_skb(dev, pkt_len + 2);
+				if (skbn != NULL) {
+					skb_reserve(skbn, 2);	/* align IP header */
+					skb_copy_from_linear_data(skb,
+						      skbn->data, pkt_len);
+					swap(skb, skbn);
+					dma_sync_single_for_cpu(fep->dev,
+						CBDR_BUFADDR(bdp),
+						L1_CACHE_ALIGN(pkt_len),
+						DMA_FROM_DEVICE);
+				}
+			} else {
+				skbn = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
+
+				if (skbn) {
+					dma_addr_t dma;
+
+					skb_align(skbn, ENET_RX_ALIGN);
+
+					dma_unmap_single(fep->dev,
+						CBDR_BUFADDR(bdp),
+						L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+						DMA_FROM_DEVICE);
+
+					dma = dma_map_single(fep->dev,
+						skbn->data,
+						L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+						DMA_FROM_DEVICE);
+					CBDW_BUFADDR(bdp, dma);
+				}
+			}
+
+			if (skbn != NULL) {
+				skb_put(skb, pkt_len);	/* Make room */
+				skb->protocol = eth_type_trans(skb, dev);
+				received++;
+				netif_receive_skb(skb);
+			} else {
+				dev->stats.rx_dropped++;
+				skbn = skb;
+			}
+		}
+
+		fep->rx_skbuff[curidx] = skbn;
+		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;
+
+	if (received < budget && tx_left) {
+		/* done */
+		napi_complete_done(napi, received);
+		(*fep->ops->napi_enable)(dev);
+
+		return received;
+	}
+
+	return budget;
+}
+
+/*
+ * 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;
+		int_clr_events &= ~fep->ev_napi;
+
+		(*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) {
+			napi_ok = napi_schedule_prep(&fep->napi);
+
+			(*fep->ops->napi_disable)(dev);
+			(*fep->ops->clear_int_events)(dev, fep->ev_napi);
+
+			/* NOTE: it is possible for FCCs in NAPI mode    */
+			/* to submit a spurious interrupt while in poll  */
+			if (napi_ok)
+				__napi_schedule(&fep->napi);
+		}
+
+	}
+
+	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 = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
+		if (skb == NULL)
+			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);
+	}
+}
+
+/**********************************************************************************/
+
+#ifdef CONFIG_FS_ENET_MPC5121_FEC
+/*
+ * MPC5121 FEC requeries 4-byte alignment for TX data buffer!
+ */
+static struct sk_buff *tx_skb_align_workaround(struct net_device *dev,
+					       struct sk_buff *skb)
+{
+	struct sk_buff *new_skb;
+
+	if (skb_linearize(skb))
+		return NULL;
+
+	/* Alloc new skb */
+	new_skb = netdev_alloc_skb(dev, skb->len + 4);
+	if (!new_skb)
+		return NULL;
+
+	/* Make sure new skb is properly aligned */
+	skb_align(new_skb, 4);
+
+	/* Copy data to new skb ... */
+	skb_copy_from_linear_data(skb, new_skb->data, skb->len);
+	skb_put(new_skb, skb->len);
+
+	/* ... and free an old one */
+	dev_kfree_skb_any(skb);
+
+	return new_skb;
+}
+#endif
+
+static netdev_tx_t
+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;
+	int nr_frags;
+	skb_frag_t *frag;
+	int len;
+#ifdef CONFIG_FS_ENET_MPC5121_FEC
+	int is_aligned = 1;
+	int i;
+
+	if (!IS_ALIGNED((unsigned long)skb->data, 4)) {
+		is_aligned = 0;
+	} else {
+		nr_frags = skb_shinfo(skb)->nr_frags;
+		frag = skb_shinfo(skb)->frags;
+		for (i = 0; i < nr_frags; i++, frag++) {
+			if (!IS_ALIGNED(frag->page_offset, 4)) {
+				is_aligned = 0;
+				break;
+			}
+		}
+	}
+
+	if (!is_aligned) {
+		skb = tx_skb_align_workaround(dev, skb);
+		if (!skb) {
+			/*
+			 * We have lost packet due to memory allocation error
+			 * in tx_skb_align_workaround(). Hopefully original
+			 * skb is still valid, so try transmit it later.
+			 */
+			return NETDEV_TX_BUSY;
+		}
+	}
+#endif
+
+	spin_lock(&fep->tx_lock);
+
+	/*
+	 * Fill in a Tx ring entry
+	 */
+	bdp = fep->cur_tx;
+
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	if (fep->tx_free <= nr_frags || (CBDR_SC(bdp) & BD_ENET_TX_READY)) {
+		netif_stop_queue(dev);
+		spin_unlock(&fep->tx_lock);
+
+		/*
+		 * Ooops.  All transmit buffers are full.  Bail out.
+		 * This should not happen, since the tx queue should be stopped.
+		 */
+		dev_warn(fep->dev, "tx queue full!.\n");
+		return NETDEV_TX_BUSY;
+	}
+
+	curidx = bdp - fep->tx_bd_base;
+
+	len = skb->len;
+	dev->stats.tx_bytes += len;
+	if (nr_frags)
+		len -= skb->data_len;
+	fep->tx_free -= nr_frags + 1;
+	/*
+	 * Push the data cache so the CPM does not get stale memory data.
+	 */
+	CBDW_BUFADDR(bdp, dma_map_single(fep->dev,
+				skb->data, len, DMA_TO_DEVICE));
+	CBDW_DATLEN(bdp, len);
+
+	fep->mapped_as_page[curidx] = 0;
+	frag = skb_shinfo(skb)->frags;
+	while (nr_frags) {
+		CBDC_SC(bdp,
+			BD_ENET_TX_STATS | BD_ENET_TX_INTR | BD_ENET_TX_LAST |
+			BD_ENET_TX_TC);
+		CBDS_SC(bdp, BD_ENET_TX_READY);
+
+		if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
+			bdp++, curidx++;
+		else
+			bdp = fep->tx_bd_base, curidx = 0;
+
+		len = skb_frag_size(frag);
+		CBDW_BUFADDR(bdp, skb_frag_dma_map(fep->dev, frag, 0, len,
+						   DMA_TO_DEVICE));
+		CBDW_DATLEN(bdp, len);
+
+		fep->tx_skbuff[curidx] = NULL;
+		fep->mapped_as_page[curidx] = 1;
+
+		frag++;
+		nr_frags--;
+	}
+
+	/* 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;
+	CBDC_SC(bdp, BD_ENET_TX_STATS);
+	CBDS_SC(bdp, sc);
+
+	/* Save skb pointer. */
+	fep->tx_skbuff[curidx] = skb;
+
+	/* If this was the last BD in the ring, start at the beginning again. */
+	if ((CBDR_SC(bdp) & BD_ENET_TX_WRAP) == 0)
+		bdp++;
+	else
+		bdp = fep->tx_bd_base;
+	fep->cur_tx = bdp;
+
+	if (fep->tx_free < MAX_SKB_FRAGS)
+		netif_stop_queue(dev);
+
+	skb_tx_timestamp(skb);
+
+	(*fep->ops->tx_kickstart)(dev);
+
+	spin_unlock(&fep->tx_lock);
+
+	return NETDEV_TX_OK;
+}
+
+static void fs_timeout_work(struct work_struct *work)
+{
+	struct fs_enet_private *fep = container_of(work, struct fs_enet_private,
+						   timeout_work);
+	struct net_device *dev = fep->ndev;
+	unsigned long flags;
+	int wake = 0;
+
+	dev->stats.tx_errors++;
+
+	spin_lock_irqsave(&fep->lock, flags);
+
+	if (dev->flags & IFF_UP) {
+		phy_stop(dev->phydev);
+		(*fep->ops->stop)(dev);
+		(*fep->ops->restart)(dev);
+	}
+
+	phy_start(dev->phydev);
+	wake = fep->tx_free >= MAX_SKB_FRAGS &&
+	       !(CBDR_SC(fep->cur_tx) & BD_ENET_TX_READY);
+	spin_unlock_irqrestore(&fep->lock, flags);
+
+	if (wake)
+		netif_wake_queue(dev);
+}
+
+static void fs_timeout(struct net_device *dev)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+
+	schedule_work(&fep->timeout_work);
+}
+
+/*-----------------------------------------------------------------------------
+ *  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 = dev->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;
+	phy_interface_t iface;
+
+	fep->oldlink = 0;
+	fep->oldspeed = 0;
+	fep->oldduplex = -1;
+
+	iface = fep->fpi->use_rmii ?
+		PHY_INTERFACE_MODE_RMII : PHY_INTERFACE_MODE_MII;
+
+	phydev = of_phy_connect(dev, fep->fpi->phy_node, &fs_adjust_link, 0,
+				iface);
+	if (!phydev) {
+		dev_err(&dev->dev, "Could not attach to PHY\n");
+		return -ENODEV;
+	}
+
+	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_napi */
+	fs_init_bds(fep->ndev);
+
+	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) {
+		dev_err(fep->dev, "Could not allocate FS_ENET IRQ!");
+		napi_disable(&fep->napi);
+		return -EINVAL;
+	}
+
+	err = fs_init_phy(dev);
+	if (err) {
+		free_irq(fep->interrupt, dev);
+		napi_disable(&fep->napi);
+		return err;
+	}
+	phy_start(dev->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);
+	napi_disable(&fep->napi);
+	cancel_work_sync(&fep->timeout_work);
+	phy_stop(dev->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(dev->phydev);
+	free_irq(fep->interrupt, dev);
+
+	return 0;
+}
+
+/*************************************************************************/
+
+static void fs_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info)
+{
+	strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
+	strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->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 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 int fs_get_tunable(struct net_device *dev,
+			  const struct ethtool_tunable *tuna, void *data)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	struct fs_platform_info *fpi = fep->fpi;
+	int ret = 0;
+
+	switch (tuna->id) {
+	case ETHTOOL_RX_COPYBREAK:
+		*(u32 *)data = fpi->rx_copybreak;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int fs_set_tunable(struct net_device *dev,
+			  const struct ethtool_tunable *tuna, const void *data)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	struct fs_platform_info *fpi = fep->fpi;
+	int ret = 0;
+
+	switch (tuna->id) {
+	case ETHTOOL_RX_COPYBREAK:
+		fpi->rx_copybreak = *(u32 *)data;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static const struct ethtool_ops fs_ethtool_ops = {
+	.get_drvinfo = fs_get_drvinfo,
+	.get_regs_len = fs_get_regs_len,
+	.nway_reset = phy_ethtool_nway_reset,
+	.get_link = ethtool_op_get_link,
+	.get_msglevel = fs_get_msglevel,
+	.set_msglevel = fs_set_msglevel,
+	.get_regs = fs_get_regs,
+	.get_ts_info = ethtool_op_get_ts_info,
+	.get_link_ksettings = phy_ethtool_get_link_ksettings,
+	.set_link_ksettings = phy_ethtool_set_link_ksettings,
+	.get_tunable = fs_get_tunable,
+	.set_tunable = fs_set_tunable,
+};
+
+static int fs_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	return phy_mii_ioctl(dev->phydev, rq, cmd);
+}
+
+extern int fs_mii_connect(struct net_device *dev);
+extern void fs_mii_disconnect(struct net_device *dev);
+
+/**************************************************************************************/
+
+#ifdef CONFIG_FS_ENET_HAS_FEC
+#define IS_FEC(match) ((match)->data == &fs_fec_ops)
+#else
+#define IS_FEC(match) 0
+#endif
+
+static const struct net_device_ops fs_enet_netdev_ops = {
+	.ndo_open		= fs_enet_open,
+	.ndo_stop		= fs_enet_close,
+	.ndo_start_xmit		= fs_enet_start_xmit,
+	.ndo_tx_timeout		= fs_timeout,
+	.ndo_set_rx_mode	= fs_set_multicast_list,
+	.ndo_do_ioctl		= fs_ioctl,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= fs_enet_netpoll,
+#endif
+};
+
+static const struct of_device_id fs_enet_match[];
+static int fs_enet_probe(struct platform_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;
+	struct clk *clk;
+	int err;
+	const u8 *mac_addr;
+	const char *phy_connection_type;
+	int privsize, len, ret = -ENODEV;
+
+	match = of_match_device(fs_enet_match, &ofdev->dev);
+	if (!match)
+		return -EINVAL;
+
+	fpi = kzalloc(sizeof(*fpi), GFP_KERNEL);
+	if (!fpi)
+		return -ENOMEM;
+
+	if (!IS_FEC(match)) {
+		data = of_get_property(ofdev->dev.of_node, "fsl,cpm-command", &len);
+		if (!data || len != 4)
+			goto out_free_fpi;
+
+		fpi->cp_command = *data;
+	}
+
+	fpi->rx_ring = RX_RING_SIZE;
+	fpi->tx_ring = TX_RING_SIZE;
+	fpi->rx_copybreak = 240;
+	fpi->napi_weight = 17;
+	fpi->phy_node = of_parse_phandle(ofdev->dev.of_node, "phy-handle", 0);
+	if (!fpi->phy_node && of_phy_is_fixed_link(ofdev->dev.of_node)) {
+		err = of_phy_register_fixed_link(ofdev->dev.of_node);
+		if (err)
+			goto out_free_fpi;
+
+		/* In the case of a fixed PHY, the DT node associated
+		 * to the PHY is the Ethernet MAC DT node.
+		 */
+		fpi->phy_node = of_node_get(ofdev->dev.of_node);
+	}
+
+	if (of_device_is_compatible(ofdev->dev.of_node, "fsl,mpc5125-fec")) {
+		phy_connection_type = of_get_property(ofdev->dev.of_node,
+						"phy-connection-type", NULL);
+		if (phy_connection_type && !strcmp("rmii", phy_connection_type))
+			fpi->use_rmii = 1;
+	}
+
+	/* make clock lookup non-fatal (the driver is shared among platforms),
+	 * but require enable to succeed when a clock was specified/found,
+	 * keep a reference to the clock upon successful acquisition
+	 */
+	clk = devm_clk_get(&ofdev->dev, "per");
+	if (!IS_ERR(clk)) {
+		ret = clk_prepare_enable(clk);
+		if (ret)
+			goto out_deregister_fixed_link;
+
+		fpi->clk_per = clk;
+	}
+
+	privsize = sizeof(*fep) +
+	           sizeof(struct sk_buff **) *
+		     (fpi->rx_ring + fpi->tx_ring) +
+		   sizeof(char) * fpi->tx_ring;
+
+	ndev = alloc_etherdev(privsize);
+	if (!ndev) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
+
+	SET_NETDEV_DEV(ndev, &ofdev->dev);
+	platform_set_drvdata(ofdev, 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;
+	fep->mapped_as_page = (char *)(fep->rx_skbuff + fpi->rx_ring +
+				       fpi->tx_ring);
+
+	spin_lock_init(&fep->lock);
+	spin_lock_init(&fep->tx_lock);
+
+	mac_addr = of_get_mac_address(ofdev->dev.of_node);
+	if (mac_addr)
+		memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
+
+	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->netdev_ops = &fs_enet_netdev_ops;
+	ndev->watchdog_timeo = 2 * HZ;
+	INIT_WORK(&fep->timeout_work, fs_timeout_work);
+	netif_napi_add(ndev, &fep->napi, fs_enet_napi, fpi->napi_weight);
+
+	ndev->ethtool_ops = &fs_ethtool_ops;
+
+	netif_carrier_off(ndev);
+
+	ndev->features |= NETIF_F_SG;
+
+	ret = register_netdev(ndev);
+	if (ret)
+		goto out_free_bd;
+
+	pr_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);
+out_put:
+	if (fpi->clk_per)
+		clk_disable_unprepare(fpi->clk_per);
+out_deregister_fixed_link:
+	of_node_put(fpi->phy_node);
+	if (of_phy_is_fixed_link(ofdev->dev.of_node))
+		of_phy_deregister_fixed_link(ofdev->dev.of_node);
+out_free_fpi:
+	kfree(fpi);
+	return ret;
+}
+
+static int fs_enet_remove(struct platform_device *ofdev)
+{
+	struct net_device *ndev = platform_get_drvdata(ofdev);
+	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);
+	of_node_put(fep->fpi->phy_node);
+	if (fep->fpi->clk_per)
+		clk_disable_unprepare(fep->fpi->clk_per);
+	if (of_phy_is_fixed_link(ofdev->dev.of_node))
+		of_phy_deregister_fixed_link(ofdev->dev.of_node);
+	free_netdev(ndev);
+	return 0;
+}
+
+static const 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
+#ifdef CONFIG_FS_ENET_MPC5121_FEC
+	{
+		.compatible = "fsl,mpc5121-fec",
+		.data = (void *)&fs_fec_ops,
+	},
+	{
+		.compatible = "fsl,mpc5125-fec",
+		.data = (void *)&fs_fec_ops,
+	},
+#else
+	{
+		.compatible = "fsl,pq1-fec-enet",
+		.data = (void *)&fs_fec_ops,
+	},
+#endif
+#endif
+	{}
+};
+MODULE_DEVICE_TABLE(of, fs_enet_match);
+
+static struct platform_driver fs_enet_driver = {
+	.driver = {
+		.name = "fs_enet",
+		.of_match_table = fs_enet_match,
+	},
+	.probe = fs_enet_probe,
+	.remove = fs_enet_remove,
+};
+
+#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_platform_driver(fs_enet_driver);