Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1275 insertions, 0 deletions

diff --git a/drivers/net/fec_8xx/fec_main.c b/drivers/net/fec_8xx/fec_main.c
new file mode 100644
index 00000000000..b4f3a9f8a53
--- /dev/null
+++ b/drivers/net/fec_8xx/fec_main.c
@@ -0,0 +1,1275 @@
+/*
+ * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
+ *
+ * Copyright (c) 2003 Intracom S.A. 
+ *  by Pantelis Antoniou <panto@intracom.gr>
+ *
+ * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
+ * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
+ *
+ * Released under the GPL
+ */
+
+#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 <asm/8xx_immap.h>
+#include <asm/pgtable.h>
+#include <asm/mpc8xx.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/commproc.h>
+#include <asm/dma-mapping.h>
+
+#include "fec_8xx.h"
+
+/*************************************************/
+
+#define FEC_MAX_MULTICAST_ADDRS	64
+
+/*************************************************/
+
+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("Motorola 8xx FEC ethernet driver");
+MODULE_LICENSE("GPL");
+
+MODULE_PARM(fec_8xx_debug, "i");
+MODULE_PARM_DESC(fec_8xx_debug,
+		 "FEC 8xx bitmapped debugging message enable value");
+
+int fec_8xx_debug = -1;		/* -1 == use FEC_8XX_DEF_MSG_ENABLE as value */
+
+/*************************************************/
+
+/*
+ * Delay to wait for FEC reset command to complete (in us) 
+ */
+#define FEC_RESET_DELAY		50
+
+/*****************************************************************************************/
+
+static void fec_whack_reset(fec_t * fecp)
+{
+	int i;
+
+	/*
+	 * Whack a reset.  We should wait for this.  
+	 */
+	FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_RESET);
+	for (i = 0;
+	     (FR(fecp, ecntrl) & FEC_ECNTRL_RESET) != 0 && i < FEC_RESET_DELAY;
+	     i++)
+		udelay(1);
+
+	if (i == FEC_RESET_DELAY)
+		printk(KERN_WARNING "FEC Reset timeout!\n");
+
+}
+
+/****************************************************************************/
+
+/*
+ * Transmitter timeout.  
+ */
+#define TX_TIMEOUT (2*HZ)
+
+/****************************************************************************/
+
+/*
+ * Returns the CRC needed when filling in the hash table for
+ * multicast group filtering
+ * pAddr must point to a MAC address (6 bytes)
+ */
+static __u32 fec_mulicast_calc_crc(char *pAddr)
+{
+	u8 byte;
+	int byte_count;
+	int bit_count;
+	__u32 crc = 0xffffffff;
+	u8 msb;
+
+	for (byte_count = 0; byte_count < 6; byte_count++) {
+		byte = pAddr[byte_count];
+		for (bit_count = 0; bit_count < 8; bit_count++) {
+			msb = crc >> 31;
+			crc <<= 1;
+			if (msb ^ (byte & 0x1)) {
+				crc ^= FEC_CRC_POLY;
+			}
+			byte >>= 1;
+		}
+	}
+	return (crc);
+}
+
+/*
+ * Set or clear the multicast filter for this adaptor.
+ * Skeleton taken from sunlance driver.
+ * The CPM Ethernet implementation allows Multicast as well as individual
+ * MAC address filtering.  Some of the drivers check to make sure it is
+ * a group multicast address, and discard those that are not.  I guess I
+ * will do the same for now, but just remove the test if you want
+ * individual filtering as well (do the upper net layers want or support
+ * this kind of feature?).
+ */
+static void fec_set_multicast_list(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	fec_t *fecp = fep->fecp;
+	struct dev_mc_list *pmc;
+	__u32 crc;
+	int temp;
+	__u32 csrVal;
+	int hash_index;
+	__u32 hthi, htlo;
+	unsigned long flags;
+
+
+	if ((dev->flags & IFF_PROMISC) != 0) {
+
+		spin_lock_irqsave(&fep->lock, flags);
+		FS(fecp, r_cntrl, FEC_RCNTRL_PROM);
+		spin_unlock_irqrestore(&fep->lock, flags);
+
+		/*
+		 * Log any net taps. 
+		 */
+		printk(KERN_WARNING DRV_MODULE_NAME
+		       ": %s: Promiscuous mode enabled.\n", dev->name);
+		return;
+
+	}
+
+	if ((dev->flags & IFF_ALLMULTI) != 0 ||
+	    dev->mc_count > FEC_MAX_MULTICAST_ADDRS) {
+		/*
+		 * Catch all multicast addresses, set the filter to all 1's.
+		 */
+		hthi = 0xffffffffU;
+		htlo = 0xffffffffU;
+	} else {
+		hthi = 0;
+		htlo = 0;
+
+		/*
+		 * Now populate the hash table 
+		 */
+		for (pmc = dev->mc_list; pmc != NULL; pmc = pmc->next) {
+			crc = fec_mulicast_calc_crc(pmc->dmi_addr);
+			temp = (crc & 0x3f) >> 1;
+			hash_index = ((temp & 0x01) << 4) |
+				     ((temp & 0x02) << 2) |
+				     ((temp & 0x04)) |
+				     ((temp & 0x08) >> 2) |
+				     ((temp & 0x10) >> 4);
+			csrVal = (1 << hash_index);
+			if (crc & 1)
+				hthi |= csrVal;
+			else
+				htlo |= csrVal;
+		}
+	}
+
+	spin_lock_irqsave(&fep->lock, flags);
+	FC(fecp, r_cntrl, FEC_RCNTRL_PROM);
+	FW(fecp, hash_table_high, hthi);
+	FW(fecp, hash_table_low, htlo);
+	spin_unlock_irqrestore(&fep->lock, flags);
+}
+
+static int fec_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *mac = addr;
+	struct fec_enet_private *fep = netdev_priv(dev);
+	struct fec *fecp = fep->fecp;
+	int i;
+	__u32 addrhi, addrlo;
+	unsigned long flags;
+
+	/* Get pointer to SCC area in parameter RAM. */
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = mac->sa_data[i];
+
+	/*
+	 * Set station address. 
+	 */
+	addrhi = ((__u32) dev->dev_addr[0] << 24) |
+		 ((__u32) dev->dev_addr[1] << 16) |
+	   	 ((__u32) dev->dev_addr[2] <<  8) |
+	    	  (__u32) dev->dev_addr[3];
+	addrlo = ((__u32) dev->dev_addr[4] << 24) |
+	    	 ((__u32) dev->dev_addr[5] << 16);
+
+	spin_lock_irqsave(&fep->lock, flags);
+	FW(fecp, addr_low, addrhi);
+	FW(fecp, addr_high, addrlo);
+	spin_unlock_irqrestore(&fep->lock, flags);
+
+	return 0;
+}
+
+/*
+ * This function is called to start or restart the FEC during a link
+ * change.  This only happens when switching between half and full
+ * duplex.
+ */
+void fec_restart(struct net_device *dev, int duplex, int speed)
+{
+#ifdef CONFIG_DUET
+	immap_t *immap = (immap_t *) IMAP_ADDR;
+	__u32 cptr;
+#endif
+	struct fec_enet_private *fep = netdev_priv(dev);
+	struct fec *fecp = fep->fecp;
+	const struct fec_platform_info *fpi = fep->fpi;
+	cbd_t *bdp;
+	struct sk_buff *skb;
+	int i;
+	__u32 addrhi, addrlo;
+
+	fec_whack_reset(fep->fecp);
+
+	/*
+	 * Set station address. 
+	 */
+	addrhi = ((__u32) dev->dev_addr[0] << 24) |
+		 ((__u32) dev->dev_addr[1] << 16) |
+		 ((__u32) dev->dev_addr[2] <<  8) |
+		 (__u32) dev->dev_addr[3];
+	addrlo = ((__u32) dev->dev_addr[4] << 24) |
+		 ((__u32) dev->dev_addr[5] << 16);
+	FW(fecp, addr_low, addrhi);
+	FW(fecp, addr_high, addrlo);
+
+	/*
+	 * Reset all multicast. 
+	 */
+	FW(fecp, hash_table_high, 0);
+	FW(fecp, hash_table_low, 0);
+
+	/*
+	 * Set maximum receive buffer size. 
+	 */
+	FW(fecp, r_buff_size, PKT_MAXBLR_SIZE);
+	FW(fecp, r_hash, PKT_MAXBUF_SIZE);
+
+	/*
+	 * Set receive and transmit descriptor base. 
+	 */
+	FW(fecp, r_des_start, iopa((__u32) (fep->rx_bd_base)));
+	FW(fecp, x_des_start, iopa((__u32) (fep->tx_bd_base)));
+
+	fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
+	fep->tx_free = fep->tx_ring;
+	fep->cur_rx = fep->rx_bd_base;
+
+	/*
+	 * Reset SKB receive buffers 
+	 */
+	for (i = 0; i < fep->rx_ring; i++) {
+		if ((skb = fep->rx_skbuff[i]) == NULL)
+			continue;
+		fep->rx_skbuff[i] = NULL;
+		dev_kfree_skb(skb);
+	}
+
+	/*
+	 * 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);
+			fep->stats.rx_dropped++;
+			break;
+		}
+		fep->rx_skbuff[i] = skb;
+		skb->dev = dev;
+		CBDW_BUFADDR(bdp, dma_map_single(NULL, 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);
+	}
+
+	/*
+	 * Reset SKB transmit buffers.  
+	 */
+	for (i = 0; i < fep->tx_ring; i++) {
+		if ((skb = fep->tx_skbuff[i]) == NULL)
+			continue;
+		fep->tx_skbuff[i] = NULL;
+		dev_kfree_skb(skb);
+	}
+
+	/*
+	 * ...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, virt_to_bus(NULL));
+		CBDW_DATLEN(bdp, 0);
+		CBDW_SC(bdp, (i < fep->tx_ring - 1) ? 0 : BD_SC_WRAP);
+	}
+
+	/*
+	 * Enable big endian and don't care about SDMA FC. 
+	 */
+	FW(fecp, fun_code, 0x78000000);
+
+	/*
+	 * Set MII speed. 
+	 */
+	FW(fecp, mii_speed, fep->fec_phy_speed);
+
+	/*
+	 * Clear any outstanding interrupt. 
+	 */
+	FW(fecp, ievent, 0xffc0);
+	FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
+
+	/*
+	 * adjust to speed (only for DUET & RMII) 
+	 */
+#ifdef CONFIG_DUET
+	cptr = in_be32(&immap->im_cpm.cp_cptr);
+	switch (fpi->fec_no) {
+	case 0:
+		/*
+		 * check if in RMII mode 
+		 */
+		if ((cptr & 0x100) == 0)
+			break;
+
+		if (speed == 10)
+			cptr |= 0x0000010;
+		else if (speed == 100)
+			cptr &= ~0x0000010;
+		break;
+	case 1:
+		/*
+		 * check if in RMII mode 
+		 */
+		if ((cptr & 0x80) == 0)
+			break;
+
+		if (speed == 10)
+			cptr |= 0x0000008;
+		else if (speed == 100)
+			cptr &= ~0x0000008;
+		break;
+	default:
+		break;
+	}
+	out_be32(&immap->im_cpm.cp_cptr, cptr);
+#endif
+
+	FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);	/* MII enable */
+	/*
+	 * adjust to duplex mode 
+	 */
+	if (duplex) {
+		FC(fecp, r_cntrl, FEC_RCNTRL_DRT);
+		FS(fecp, x_cntrl, FEC_TCNTRL_FDEN);	/* FD enable */
+	} else {
+		FS(fecp, r_cntrl, FEC_RCNTRL_DRT);
+		FC(fecp, x_cntrl, FEC_TCNTRL_FDEN);	/* FD disable */
+	}
+
+	/*
+	 * Enable interrupts we wish to service. 
+	 */
+	FW(fecp, imask, FEC_ENET_TXF | FEC_ENET_TXB |
+	   FEC_ENET_RXF | FEC_ENET_RXB);
+
+	/*
+	 * And last, enable the transmit and receive processing. 
+	 */
+	FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
+	FW(fecp, r_des_active, 0x01000000);
+}
+
+void fec_stop(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	fec_t *fecp = fep->fecp;
+	struct sk_buff *skb;
+	int i;
+
+	if ((FR(fecp, ecntrl) & FEC_ECNTRL_ETHER_EN) == 0)
+		return;		/* already down */
+
+	FW(fecp, x_cntrl, 0x01);	/* Graceful transmit stop */
+	for (i = 0; ((FR(fecp, ievent) & 0x10000000) == 0) &&
+	     i < FEC_RESET_DELAY; i++)
+		udelay(1);
+
+	if (i == FEC_RESET_DELAY)
+		printk(KERN_WARNING DRV_MODULE_NAME
+		       ": %s FEC timeout on graceful transmit stop\n",
+		       dev->name);
+	/*
+	 * Disable FEC. Let only MII interrupts. 
+	 */
+	FW(fecp, imask, 0);
+	FW(fecp, ecntrl, ~FEC_ECNTRL_ETHER_EN);
+
+	/*
+	 * Reset SKB transmit buffers.  
+	 */
+	for (i = 0; i < fep->tx_ring; i++) {
+		if ((skb = fep->tx_skbuff[i]) == NULL)
+			continue;
+		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;
+		fep->rx_skbuff[i] = NULL;
+		dev_kfree_skb(skb);
+	}
+}
+
+/* common receive function */
+static int fec_enet_rx_common(struct net_device *dev, int *budget)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	fec_t *fecp = fep->fecp;
+	const struct fec_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;
+
+	if (fpi->use_napi) {
+		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*/
+	if (fpi->use_napi)
+		FW(fecp, ievent, FEC_ENET_RXF | FEC_ENET_RXB);
+
+	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++;
+
+			skbn = fep->rx_skbuff[curidx];
+			BUG_ON(skbn == NULL);
+
+		} else {
+
+			/* napi, got packet but no quota */
+			if (fpi->use_napi && --rx_work_limit < 0)
+				break;
+
+			skb = fep->rx_skbuff[curidx];
+			BUG_ON(skb == NULL);
+
+			/*
+			 * 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++;
+				if (!fpi->use_napi)
+					netif_rx(skb);
+				else
+					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(NULL, 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;
+
+		/*
+		 * Doing this here will keep the FEC running while we process
+		 * incoming frames.  On a heavily loaded network, we should be
+		 * able to keep up at the expense of system resources.
+		 */
+		FW(fecp, r_des_active, 0x01000000);
+	}
+
+	fep->cur_rx = bdp;
+
+	if (fpi->use_napi) {
+		dev->quota -= received;
+		*budget -= received;
+
+		if (rx_work_limit < 0)
+			return 1;	/* not done */
+
+		/* done */
+		netif_rx_complete(dev);
+
+		/* enable RX interrupt bits */
+		FS(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
+	}
+
+	return 0;
+}
+
+static void fec_enet_tx(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	cbd_t *bdp;
+	struct sk_buff *skb;
+	int dirtyidx, do_wake;
+	__u16 sc;
+
+	spin_lock(&fep->lock);
+	bdp = fep->dirty_tx;
+
+	do_wake = 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)) {
+			fep->stats.tx_errors++;
+			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++;
+		} 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++;
+
+		/*
+		 * 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;
+
+	spin_unlock(&fep->lock);
+
+	if (do_wake && netif_queue_stopped(dev))
+		netif_wake_queue(dev);
+}
+
+/*
+ * The interrupt handler.
+ * This is called from the MPC core interrupt.
+ */
+static irqreturn_t
+fec_enet_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct fec_enet_private *fep;
+	const struct fec_platform_info *fpi;
+	fec_t *fecp;
+	__u32 int_events;
+	__u32 int_events_napi;
+
+	if (unlikely(dev == NULL))
+		return IRQ_NONE;
+
+	fep = netdev_priv(dev);
+	fecp = fep->fecp;
+	fpi = fep->fpi;
+
+	/*
+	 * Get the interrupt events that caused us to be here.
+	 */
+	while ((int_events = FR(fecp, ievent) & FR(fecp, imask)) != 0) {
+
+		if (!fpi->use_napi)
+			FW(fecp, ievent, int_events);
+		else {
+			int_events_napi = int_events & ~(FEC_ENET_RXF | FEC_ENET_RXB);
+			FW(fecp, ievent, int_events_napi);
+		}
+
+		if ((int_events & (FEC_ENET_HBERR | FEC_ENET_BABR |
+				   FEC_ENET_BABT | FEC_ENET_EBERR)) != 0)
+			printk(KERN_WARNING DRV_MODULE_NAME
+			       ": %s FEC ERROR(s) 0x%x\n",
+			       dev->name, int_events);
+
+		if ((int_events & FEC_ENET_RXF) != 0) {
+			if (!fpi->use_napi)
+				fec_enet_rx_common(dev, NULL);
+			else {
+				if (netif_rx_schedule_prep(dev)) {
+					/* disable rx interrupts */
+					FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
+					__netif_rx_schedule(dev);
+				} else {
+					printk(KERN_ERR DRV_MODULE_NAME
+					       ": %s driver bug! interrupt while in poll!\n",
+					       dev->name);
+					FC(fecp, imask, FEC_ENET_RXF | FEC_ENET_RXB);
+				}
+			}
+		}
+
+		if ((int_events & FEC_ENET_TXF) != 0)
+			fec_enet_tx(dev);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* This interrupt occurs when the PHY detects a link change. */
+static irqreturn_t
+fec_mii_link_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct fec_enet_private *fep;
+	const struct fec_platform_info *fpi;
+
+	if (unlikely(dev == NULL))
+		return IRQ_NONE;
+
+	fep = netdev_priv(dev);
+	fpi = fep->fpi;
+
+	if (!fpi->use_mdio)
+		return IRQ_NONE;
+
+	/*
+	 * 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 fec_enet_open().
+	 */
+	if (!fep->phy)
+		return IRQ_NONE;
+
+	fec_mii_ack_int(dev);
+	fec_mii_link_status_change_check(dev, 0);
+
+	return IRQ_HANDLED;
+}
+
+
+/**********************************************************************************/
+
+static int fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	fec_t *fecp = fep->fecp;
+	cbd_t *bdp;
+	int curidx;
+	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 1;
+	}
+
+	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(NULL, 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 
+	 */
+	CBDS_SC(bdp, BD_ENET_TX_READY | BD_ENET_TX_INTR |
+		BD_ENET_TX_LAST | BD_ENET_TX_TC);
+	FW(fecp, x_des_active, 0x01000000);
+
+	spin_unlock_irqrestore(&fep->tx_lock, flags);
+
+	return 0;
+}
+
+static void fec_timeout(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+
+	fep->stats.tx_errors++;
+
+	if (fep->tx_free)
+		netif_wake_queue(dev);
+
+	/* check link status again */
+	fec_mii_link_status_change_check(dev, 0);
+}
+
+static int fec_enet_open(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	const struct fec_platform_info *fpi = fep->fpi;
+	unsigned long flags;
+
+	/* Install our interrupt handler. */
+	if (request_irq(fpi->fec_irq, fec_enet_interrupt, 0, "fec", dev) != 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 && 
+		request_irq(fpi->phy_irq, fec_mii_link_interrupt, 0, "fec-phy",
+				dev) != 0) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s Could not allocate PHY IRQ!", dev->name);
+		free_irq(fpi->fec_irq, dev);
+		return -EINVAL;
+	}
+
+	if (fpi->use_mdio) {
+		fec_mii_startup(dev);
+		netif_carrier_off(dev);
+		fec_mii_link_status_change_check(dev, 1);
+	} else {
+		spin_lock_irqsave(&fep->lock, flags);
+		fec_restart(dev, 1, 100);	/* XXX this sucks */
+		spin_unlock_irqrestore(&fep->lock, flags);
+
+		netif_carrier_on(dev);
+		netif_start_queue(dev);
+	}
+	return 0;
+}
+
+static int fec_enet_close(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	const struct fec_platform_info *fpi = fep->fpi;
+	unsigned long flags;
+
+	netif_stop_queue(dev);
+	netif_carrier_off(dev);
+
+	if (fpi->use_mdio)
+		fec_mii_shutdown(dev);
+
+	spin_lock_irqsave(&fep->lock, flags);
+	fec_stop(dev);
+	spin_unlock_irqrestore(&fep->lock, flags);
+
+	/* release any irqs */
+	if (fpi->phy_irq != -1)
+		free_irq(fpi->phy_irq, dev);
+	free_irq(fpi->fec_irq, dev);
+
+	return 0;
+}
+
+static struct net_device_stats *fec_enet_get_stats(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	return &fep->stats;
+}
+
+static int fec_enet_poll(struct net_device *dev, int *budget)
+{
+	return fec_enet_rx_common(dev, budget);
+}
+
+/*************************************************************************/
+
+static void fec_get_drvinfo(struct net_device *dev,
+			    struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, DRV_MODULE_NAME);
+	strcpy(info->version, DRV_MODULE_VERSION);
+}
+
+static int fec_get_regs_len(struct net_device *dev)
+{
+	return sizeof(fec_t);
+}
+
+static void fec_get_regs(struct net_device *dev, struct ethtool_regs *regs,
+			 void *p)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	unsigned long flags;
+
+	if (regs->len < sizeof(fec_t))
+		return;
+
+	regs->version = 0;
+	spin_lock_irqsave(&fep->lock, flags);
+	memcpy_fromio(p, fep->fecp, sizeof(fec_t));
+	spin_unlock_irqrestore(&fep->lock, flags);
+}
+
+static int fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct fec_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 fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct fec_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 fec_nway_reset(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	return mii_nway_restart(&fep->mii_if);
+}
+
+static __u32 fec_get_msglevel(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	return fep->msg_enable;
+}
+
+static void fec_set_msglevel(struct net_device *dev, __u32 value)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	fep->msg_enable = value;
+}
+
+static struct ethtool_ops fec_ethtool_ops = {
+	.get_drvinfo = fec_get_drvinfo,
+	.get_regs_len = fec_get_regs_len,
+	.get_settings = fec_get_settings,
+	.set_settings = fec_set_settings,
+	.nway_reset = fec_nway_reset,
+	.get_link = ethtool_op_get_link,
+	.get_msglevel = fec_get_msglevel,
+	.set_msglevel = fec_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 = fec_get_regs,
+};
+
+static int fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct fec_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;
+}
+
+int fec_8xx_init_one(const struct fec_platform_info *fpi,
+		     struct net_device **devp)
+{
+	immap_t *immap = (immap_t *) IMAP_ADDR;
+	static int fec_8xx_version_printed = 0;
+	struct net_device *dev = NULL;
+	struct fec_enet_private *fep = NULL;
+	fec_t *fecp = NULL;
+	int i;
+	int err = 0;
+	int registered = 0;
+	__u32 siel;
+
+	*devp = NULL;
+
+	switch (fpi->fec_no) {
+	case 0:
+		fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
+		break;
+#ifdef CONFIG_DUET
+	case 1:
+		fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec2;
+		break;
+#endif
+	default:
+		return -EINVAL;
+	}
+
+	if (fec_8xx_version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+
+	i = sizeof(*fep) + (sizeof(struct sk_buff **) *
+			    (fpi->rx_ring + fpi->tx_ring));
+
+	dev = alloc_etherdev(i);
+	if (!dev) {
+		err = -ENOMEM;
+		goto err;
+	}
+	SET_MODULE_OWNER(dev);
+
+	fep = netdev_priv(dev);
+
+	/* partial reset of FEC */
+	fec_whack_reset(fecp);
+
+	/* point rx_skbuff, tx_skbuff */
+	fep->rx_skbuff = (struct sk_buff **)&fep[1];
+	fep->tx_skbuff = fep->rx_skbuff + fpi->rx_ring;
+
+	fep->fecp = fecp;
+	fep->fpi = fpi;
+
+	/* init locks */
+	spin_lock_init(&fep->lock);
+	spin_lock_init(&fep->tx_lock);
+
+	/*
+	 * Set the Ethernet address. 
+	 */
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = fpi->macaddr[i];
+
+	fep->ring_base = dma_alloc_coherent(NULL,
+					    (fpi->tx_ring + fpi->rx_ring) *
+					    sizeof(cbd_t), &fep->ring_mem_addr,
+					    GFP_KERNEL);
+	if (fep->ring_base == NULL) {
+		printk(KERN_ERR DRV_MODULE_NAME
+		       ": %s dma alloc failed.\n", dev->name);
+		err = -ENOMEM;
+		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;
+
+	/* SIU interrupt */
+	if (fpi->phy_irq != -1 &&
+		(fpi->phy_irq >= SIU_IRQ0 && fpi->phy_irq < SIU_LEVEL7)) {
+
+		siel = in_be32(&immap->im_siu_conf.sc_siel);
+		if ((fpi->phy_irq & 1) == 0)
+			siel |= (0x80000000 >> fpi->phy_irq);
+		else
+			siel &= ~(0x80000000 >> (fpi->phy_irq & ~1));
+		out_be32(&immap->im_siu_conf.sc_siel, siel);
+	}
+
+	/*
+	 * The FEC Ethernet specific entries in the device structure. 
+	 */
+	dev->open = fec_enet_open;
+	dev->hard_start_xmit = fec_enet_start_xmit;
+	dev->tx_timeout = fec_timeout;
+	dev->watchdog_timeo = TX_TIMEOUT;
+	dev->stop = fec_enet_close;
+	dev->get_stats = fec_enet_get_stats;
+	dev->set_multicast_list = fec_set_multicast_list;
+	dev->set_mac_address = fec_set_mac_address;
+	if (fpi->use_napi) {
+		dev->poll = fec_enet_poll;
+		dev->weight = fpi->napi_weight;
+	}
+	dev->ethtool_ops = &fec_ethtool_ops;
+	dev->do_ioctl = fec_ioctl;
+
+	fep->fec_phy_speed =
+	    ((((fpi->sys_clk + 4999999) / 2500000) / 2) & 0x3F) << 1;
+
+	init_timer(&fep->phy_timer_list);
+
+	/* partial reset of FEC so that only MII works */
+	FW(fecp, mii_speed, fep->fec_phy_speed);
+	FW(fecp, ievent, 0xffc0);
+	FW(fecp, ivec, (fpi->fec_irq / 2) << 29);
+	FW(fecp, imask, 0);
+	FW(fecp, r_cntrl, FEC_RCNTRL_MII_MODE);	/* MII enable */
+	FW(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
+
+	netif_carrier_off(dev);
+
+	err = register_netdev(dev);
+	if (err != 0)
+		goto err;
+	registered = 1;
+
+	if (fpi->use_mdio) {
+		fep->mii_if.dev = dev;
+		fep->mii_if.mdio_read = fec_mii_read;
+		fep->mii_if.mdio_write = fec_mii_write;
+		fep->mii_if.phy_id_mask = 0x1f;
+		fep->mii_if.reg_num_mask = 0x1f;
+		fep->mii_if.phy_id = fec_mii_phy_id_detect(dev);
+	}
+
+	*devp = dev;
+
+	return 0;
+
+      err:
+	if (dev != NULL) {
+		if (fecp != NULL)
+			fec_whack_reset(fecp);
+
+		if (registered)
+			unregister_netdev(dev);
+
+		if (fep != NULL) {
+			if (fep->ring_base)
+				dma_free_coherent(NULL,
+						  (fpi->tx_ring +
+						   fpi->rx_ring) *
+						  sizeof(cbd_t), fep->ring_base,
+						  fep->ring_mem_addr);
+		}
+		free_netdev(dev);
+	}
+	return err;
+}
+
+int fec_8xx_cleanup_one(struct net_device *dev)
+{
+	struct fec_enet_private *fep = netdev_priv(dev);
+	fec_t *fecp = fep->fecp;
+	const struct fec_platform_info *fpi = fep->fpi;
+
+	fec_whack_reset(fecp);
+
+	unregister_netdev(dev);
+
+	dma_free_coherent(NULL, (fpi->tx_ring + fpi->rx_ring) * sizeof(cbd_t),
+			  fep->ring_base, fep->ring_mem_addr);
+
+	free_netdev(dev);
+
+	return 0;
+}
+
+/**************************************************************************************/
+/**************************************************************************************/
+/**************************************************************************************/
+
+static int __init fec_8xx_init(void)
+{
+	return fec_8xx_platform_init();
+}
+
+static void __exit fec_8xx_cleanup(void)
+{
+	fec_8xx_platform_cleanup();
+}
+
+/**************************************************************************************/
+/**************************************************************************************/
+/**************************************************************************************/
+
+module_init(fec_8xx_init);
+module_exit(fec_8xx_cleanup);