Add fs_enet ethernet network driver, for several embedded platforms.

1 files changed, 1226 insertions, 0 deletions

diff --git a/drivers/net/fs_enet/fs_enet-main.c b/drivers/net/fs_enet/fs_enet-main.c
new file mode 100644
index 000000000000..44fac7373289
--- /dev/null
+++ b/drivers/net/fs_enet/fs_enet-main.c
@@ -0,0 +1,1226 @@
+/*
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/sched.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/pci.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/vmalloc.h>
+#include <asm/pgtable.h>
+
+#include <asm/pgtable.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#include "fs_enet.h"
+
+/*************************************************/
+
+static char version[] __devinitdata =
+    DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")" "\n";
+
+MODULE_AUTHOR("Pantelis Antoniou <panto@intracom.gr>");
+MODULE_DESCRIPTION("Freescale Ethernet Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_MODULE_VERSION);
+
+MODULE_PARM(fs_enet_debug, "i");
+MODULE_PARM_DESC(fs_enet_debug,
+		 "Freescale bitmapped debugging message enable value");
+
+int fs_enet_debug = -1;		/* -1 == use FS_ENET_DEF_MSG_ENABLE as value */
+
+static void fs_set_multicast_list(struct net_device *dev)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+
+	(*fep->ops->set_multicast_list)(dev);
+}
+
+/* NAPI receive function */
+static int fs_enet_rx_napi(struct net_device *dev, int *budget)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	const struct fs_platform_info *fpi = fep->fpi;
+	cbd_t *bdp;
+	struct sk_buff *skb, *skbn, *skbt;
+	int received = 0;
+	u16 pkt_len, sc;
+	int curidx;
+	int rx_work_limit = 0;	/* pacify gcc */
+
+	rx_work_limit = min(dev->quota, *budget);
+
+	if (!netif_running(dev))
+		return 0;
+
+	/*
+	 * 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, skb->data,
+				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+				DMA_FROM_DEVICE);
+
+			skbn = skb;
+
+		} else {
+
+			/* napi, got packet but no quota */
+			if (--rx_work_limit < 0)
+				break;
+
+			skb = fep->rx_skbuff[curidx];
+
+			dma_unmap_single(fep->dev, skb->data,
+				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 */
+					memcpy(skbn->data, skb->data, pkt_len);
+					/* swap */
+					skbt = skb;
+					skb = skbn;
+					skbn = skbt;
+				}
+			} else
+				skbn = dev_alloc_skb(ENET_RX_FRSIZE);
+
+			if (skbn != NULL) {
+				skb->dev = dev;
+				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);
+	}
+
+	fep->cur_rx = bdp;
+
+	dev->quota -= received;
+	*budget -= received;
+
+	if (rx_work_limit < 0)
+		return 1;	/* not done */
+
+	/* done */
+	netif_rx_complete(dev);
+
+	(*fep->ops->napi_enable_rx)(dev);
+
+	return 0;
+}
+
+/* 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 *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, skb->data,
+				L1_CACHE_ALIGN(PKT_MAXBUF_SIZE),
+				DMA_FROM_DEVICE);
+
+			skbn = skb;
+
+		} else {
+
+			skb = fep->rx_skbuff[curidx];
+
+			dma_unmap_single(fep->dev, skb->data,
+				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 */
+					memcpy(skbn->data, skb->data, pkt_len);
+					/* swap */
+					skbt = skb;
+					skb = skbn;
+					skbn = skbt;
+				}
+			} else
+				skbn = dev_alloc_skb(ENET_RX_FRSIZE);
+
+			if (skbn != NULL) {
+				skb->dev = dev;
+				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 *bdp;
+	struct sk_buff *skb;
+	int dirtyidx, do_wake, do_restart;
+	u16 sc;
+
+	spin_lock(&fep->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, skb->data, 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->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 pt_regs *regs)
+{
+	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 = netif_rx_schedule_prep(dev);
+
+				(*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)
+					__netif_rx_schedule(dev);
+			}
+		}
+
+		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 *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;
+		}
+		fep->rx_skbuff[i] = skb;
+		skb->dev = dev;
+		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;
+	int i;
+
+	/*
+	 * Reset SKB transmit buffers.  
+	 */
+	for (i = 0; i < fep->tx_ring; i++) {
+		if ((skb = fep->tx_skbuff[i]) == NULL)
+			continue;
+
+		/* unmap */
+		dma_unmap_single(fep->dev, skb->data, skb->len, DMA_TO_DEVICE);
+
+		fep->tx_skbuff[i] = NULL;
+		dev_kfree_skb(skb);
+	}
+
+	/*
+	 * Reset SKB receive buffers 
+	 */
+	for (i = 0; i < fep->rx_ring; i++) {
+		if ((skb = fep->rx_skbuff[i]) == NULL)
+			continue;
+
+		/* unmap */
+		dma_unmap_single(fep->dev, skb->data,
+			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 *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 int fs_request_irq(struct net_device *dev, int irq, const char *name,
+		irqreturn_t (*irqf)(int irq, void *dev_id, struct pt_regs *regs))
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+
+	(*fep->ops->pre_request_irq)(dev, irq);
+	return request_irq(irq, irqf, SA_SHIRQ, name, dev);
+}
+
+static void fs_free_irq(struct net_device *dev, int irq)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+
+	free_irq(irq, dev);
+	(*fep->ops->post_free_irq)(dev, irq);
+}
+
+/**********************************************************************************/
+
+/* This interrupt occurs when the PHY detects a link change. */
+static irqreturn_t
+fs_mii_link_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct fs_enet_private *fep;
+	const struct fs_platform_info *fpi;
+
+	fep = netdev_priv(dev);
+	fpi = fep->fpi;
+
+	/*
+	 * Acknowledge the interrupt if possible. If we have not
+	 * found the PHY yet we can't process or acknowledge the
+	 * interrupt now. Instead we ignore this interrupt for now,
+	 * which we can do since it is edge triggered. It will be
+	 * acknowledged later by fs_enet_open().
+	 */
+	if (!fep->phy)
+		return IRQ_NONE;
+
+	fs_mii_ack_int(dev);
+	fs_mii_link_status_change_check(dev, 0);
+
+	return IRQ_HANDLED;
+}
+
+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) {
+		(*fep->ops->stop)(dev);
+		(*fep->ops->restart)(dev);
+	}
+
+	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);
+}
+
+static int fs_enet_open(struct net_device *dev)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	const struct fs_platform_info *fpi = fep->fpi;
+	int r;
+
+	/* Install our interrupt handler. */
+	r = fs_request_irq(dev, fep->interrupt, "fs_enet-mac", fs_enet_interrupt);
+	if (r != 0) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s Could not allocate FEC IRQ!", dev->name);
+		return -EINVAL;
+	}
+
+	/* Install our phy interrupt handler */
+	if (fpi->phy_irq != -1) {
+
+		r = fs_request_irq(dev, fpi->phy_irq, "fs_enet-phy", fs_mii_link_interrupt);
+		if (r != 0) {
+			printk(KERN_ERR DRV_MODULE_NAME
+			       ": %s Could not allocate PHY IRQ!", dev->name);
+			fs_free_irq(dev, fep->interrupt);
+			return -EINVAL;
+		}
+	}
+
+	fs_mii_startup(dev);
+	netif_carrier_off(dev);
+	fs_mii_link_status_change_check(dev, 1);
+
+	return 0;
+}
+
+static int fs_enet_close(struct net_device *dev)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	const struct fs_platform_info *fpi = fep->fpi;
+	unsigned long flags;
+
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+	fs_mii_shutdown(dev);
+
+	spin_lock_irqsave(&fep->lock, flags);
+	(*fep->ops->stop)(dev);
+	spin_unlock_irqrestore(&fep->lock, flags);
+
+	/* release any irqs */
+	if (fpi->phy_irq != -1)
+		fs_free_irq(dev, fpi->phy_irq);
+	fs_free_irq(dev, fep->interrupt);
+
+	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);
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(&fep->lock, flags);
+	rc = mii_ethtool_gset(&fep->mii_if, cmd);
+	spin_unlock_irqrestore(&fep->lock, flags);
+
+	return rc;
+}
+
+static int fs_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(&fep->lock, flags);
+	rc = mii_ethtool_sset(&fep->mii_if, cmd);
+	spin_unlock_irqrestore(&fep->lock, flags);
+
+	return rc;
+}
+
+static int fs_nway_reset(struct net_device *dev)
+{
+	struct fs_enet_private *fep = netdev_priv(dev);
+	return mii_nway_restart(&fep->mii_if);
+}
+
+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 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,
+	.get_tx_csum = ethtool_op_get_tx_csum,
+	.set_tx_csum = ethtool_op_set_tx_csum,	/* local! */
+	.get_sg = ethtool_op_get_sg,
+	.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;
+	unsigned long flags;
+	int rc;
+
+	if (!netif_running(dev))
+		return -EINVAL;
+
+	spin_lock_irqsave(&fep->lock, flags);
+	rc = generic_mii_ioctl(&fep->mii_if, mii, cmd, NULL);
+	spin_unlock_irqrestore(&fep->lock, flags);
+	return rc;
+}
+
+extern int fs_mii_connect(struct net_device *dev);
+extern void fs_mii_disconnect(struct net_device *dev);
+
+static struct net_device *fs_init_instance(struct device *dev,
+		const struct fs_platform_info *fpi)
+{
+	struct net_device *ndev = NULL;
+	struct fs_enet_private *fep = NULL;
+	int privsize, i, r, err = 0, registered = 0;
+
+	/* guard */
+	if ((unsigned int)fpi->fs_no >= FS_MAX_INDEX)
+		return ERR_PTR(-EINVAL);
+
+	privsize = sizeof(*fep) + (sizeof(struct sk_buff **) *
+			    (fpi->rx_ring + fpi->tx_ring));
+
+	ndev = alloc_etherdev(privsize);
+	if (!ndev) {
+		err = -ENOMEM;
+		goto err;
+	}
+	SET_MODULE_OWNER(ndev);
+
+	fep = netdev_priv(ndev);
+	memset(fep, 0, privsize);	/* clear everything */
+
+	fep->dev = dev;
+	dev_set_drvdata(dev, ndev);
+	fep->fpi = fpi;
+	if (fpi->init_ioports)
+		fpi->init_ioports();
+
+#ifdef CONFIG_FS_ENET_HAS_FEC
+	if (fs_get_fec_index(fpi->fs_no) >= 0)
+		fep->ops = &fs_fec_ops;
+#endif
+
+#ifdef CONFIG_FS_ENET_HAS_SCC
+	if (fs_get_scc_index(fpi->fs_no) >=0 )
+		fep->ops = &fs_scc_ops;
+#endif
+
+#ifdef CONFIG_FS_ENET_HAS_FCC
+	if (fs_get_fcc_index(fpi->fs_no) >= 0)
+		fep->ops = &fs_fcc_ops;
+#endif
+
+	if (fep->ops == NULL) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s No matching ops found (%d).\n",
+		       ndev->name, fpi->fs_no);
+		err = -EINVAL;
+		goto err;
+	}
+
+	r = (*fep->ops->setup_data)(ndev);
+	if (r != 0) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s setup_data failed\n",
+			ndev->name);
+		err = r;
+		goto err;
+	}
+
+	/* point rx_skbuff, tx_skbuff */
+	fep->rx_skbuff = (struct sk_buff **)&fep[1];
+	fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
+
+	/* init locks */
+	spin_lock_init(&fep->lock);
+	spin_lock_init(&fep->tx_lock);
+
+	/*
+	 * Set the Ethernet address. 
+	 */
+	for (i = 0; i < 6; i++)
+		ndev->dev_addr[i] = fpi->macaddr[i];
+	
+	r = (*fep->ops->allocate_bd)(ndev);
+	
+	if (fep->ring_base == NULL) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s buffer descriptor alloc failed (%d).\n", ndev->name, r);
+		err = r;
+		goto err;
+	}
+
+	/*
+	 * Set receive and transmit descriptor base.
+	 */
+	fep->rx_bd_base = fep->ring_base;
+	fep->tx_bd_base = fep->rx_bd_base + fpi->rx_ring;
+
+	/* initialize ring size variables */
+	fep->tx_ring = fpi->tx_ring;
+	fep->rx_ring = fpi->rx_ring;
+
+	/*
+	 * The FEC Ethernet specific entries in the device structure. 
+	 */
+	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;
+	if (fpi->use_napi) {
+		ndev->poll = fs_enet_rx_napi;
+		ndev->weight = fpi->napi_weight;
+	}
+	ndev->ethtool_ops = &fs_ethtool_ops;
+	ndev->do_ioctl = fs_ioctl;
+
+	init_timer(&fep->phy_timer_list);
+
+	netif_carrier_off(ndev);
+
+	err = register_netdev(ndev);
+	if (err != 0) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s register_netdev failed.\n", ndev->name);
+		goto err;
+	}
+	registered = 1;
+
+	err = fs_mii_connect(ndev);
+	if (err != 0) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s fs_mii_connect failed.\n", ndev->name);
+		goto err;
+	}
+
+	return ndev;
+
+      err:
+	if (ndev != NULL) {
+
+		if (registered)
+			unregister_netdev(ndev);
+
+		if (fep != NULL) {
+			(*fep->ops->free_bd)(ndev);
+			(*fep->ops->cleanup_data)(ndev);
+		}
+
+		free_netdev(ndev);
+	}
+
+	dev_set_drvdata(dev, NULL);
+
+	return ERR_PTR(err);
+}
+
+static int fs_cleanup_instance(struct net_device *ndev)
+{
+	struct fs_enet_private *fep;
+	const struct fs_platform_info *fpi;
+	struct device *dev;
+
+	if (ndev == NULL)
+		return -EINVAL;
+
+	fep = netdev_priv(ndev);
+	if (fep == NULL)
+		return -EINVAL;
+
+	fpi = fep->fpi;
+
+	fs_mii_disconnect(ndev);
+
+	unregister_netdev(ndev);
+
+	dma_free_coherent(fep->dev, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
+			  fep->ring_base, fep->ring_mem_addr);
+
+	/* reset it */
+	(*fep->ops->cleanup_data)(ndev);
+
+	dev = fep->dev;
+	if (dev != NULL) {
+		dev_set_drvdata(dev, NULL);
+		fep->dev = NULL;
+	}
+
+	free_netdev(ndev);
+
+	return 0;
+}
+
+/**************************************************************************************/
+
+/* handy pointer to the immap */
+void *fs_enet_immap = NULL;
+
+static int setup_immap(void)
+{
+	phys_addr_t paddr = 0;
+	unsigned long size = 0;
+
+#ifdef CONFIG_CPM1
+	paddr = IMAP_ADDR;
+	size = 0x10000;	/* map 64K */
+#endif
+
+#ifdef CONFIG_CPM2
+	paddr = CPM_MAP_ADDR;
+	size = 0x40000;	/* map 256 K */
+#endif
+	fs_enet_immap = ioremap(paddr, size);
+	if (fs_enet_immap == NULL)
+		return -EBADF;	/* XXX ahem; maybe just BUG_ON? */
+
+	return 0;
+}
+
+static void cleanup_immap(void)
+{
+	if (fs_enet_immap != NULL) {
+		iounmap(fs_enet_immap);
+		fs_enet_immap = NULL;
+	}
+}
+
+/**************************************************************************************/
+
+static int __devinit fs_enet_probe(struct device *dev)
+{
+	struct net_device *ndev;
+
+	/* no fixup - no device */
+	if (dev->platform_data == NULL) {
+		printk(KERN_INFO "fs_enet: "
+				"probe called with no platform data; "
+				"remove unused devices\n");
+		return -ENODEV;
+	}
+
+	ndev = fs_init_instance(dev, dev->platform_data);
+	if (IS_ERR(ndev))
+		return PTR_ERR(ndev);
+	return 0;
+}
+
+static int fs_enet_remove(struct device *dev)
+{
+	return fs_cleanup_instance(dev_get_drvdata(dev));
+}
+
+static struct device_driver fs_enet_fec_driver = {
+	.name	  	= "fsl-cpm-fec",
+	.bus		= &platform_bus_type,
+	.probe		= fs_enet_probe,
+	.remove		= fs_enet_remove,
+#ifdef CONFIG_PM
+/*	.suspend	= fs_enet_suspend,	TODO */
+/*	.resume		= fs_enet_resume,	TODO */
+#endif
+};
+
+static struct device_driver fs_enet_scc_driver = {
+	.name	  	= "fsl-cpm-scc",
+	.bus		= &platform_bus_type,
+	.probe		= fs_enet_probe,
+	.remove		= fs_enet_remove,
+#ifdef CONFIG_PM
+/*	.suspend	= fs_enet_suspend,	TODO */
+/*	.resume		= fs_enet_resume,	TODO */
+#endif
+};
+
+static struct device_driver fs_enet_fcc_driver = {
+	.name	  	= "fsl-cpm-fcc",
+	.bus		= &platform_bus_type,
+	.probe		= fs_enet_probe,
+	.remove		= fs_enet_remove,
+#ifdef CONFIG_PM
+/*	.suspend	= fs_enet_suspend,	TODO */
+/*	.resume		= fs_enet_resume,	TODO */
+#endif
+};
+
+static int __init fs_init(void)
+{
+	int r;
+
+	printk(KERN_INFO
+			"%s", version);
+
+	r = setup_immap();
+	if (r != 0)
+		return r;
+	r = driver_register(&fs_enet_fec_driver);
+	if (r != 0)
+		goto err;
+
+	r = driver_register(&fs_enet_fcc_driver);
+	if (r != 0)
+		goto err;
+
+	r = driver_register(&fs_enet_scc_driver);
+	if (r != 0)
+		goto err;
+
+	return 0;
+err:
+	cleanup_immap();
+	return r;
+	
+}
+
+static void __exit fs_cleanup(void)
+{
+	driver_unregister(&fs_enet_fec_driver);
+	driver_unregister(&fs_enet_fcc_driver);
+	driver_unregister(&fs_enet_scc_driver);
+	cleanup_immap();
+}
+
+/**************************************************************************************/
+
+module_init(fs_init);
+module_exit(fs_cleanup);