Linux-2.6.12-rc2v2.6.12-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, 1849 insertions, 0 deletions

diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
new file mode 100644
index 00000000000..b43b2b11aac
--- /dev/null
+++ b/drivers/net/gianfar.c
@@ -0,0 +1,1849 @@
+/* 
+ * drivers/net/gianfar.c
+ *
+ * Gianfar Ethernet Driver
+ * Driver for FEC on MPC8540 and TSEC on MPC8540/MPC8560
+ * Based on 8260_io/fcc_enet.c
+ *
+ * Author: Andy Fleming
+ * Maintainer: Kumar Gala (kumar.gala@freescale.com)
+ *
+ * Copyright (c) 2002-2004 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ *  Gianfar:  AKA Lambda Draconis, "Dragon"
+ *  RA 11 31 24.2
+ *  Dec +69 19 52
+ *  V 3.84
+ *  B-V +1.62
+ *
+ *  Theory of operation
+ *  This driver is designed for the Triple-speed Ethernet
+ *  controllers on the Freescale 8540/8560 integrated processors,
+ *  as well as the Fast Ethernet Controller on the 8540.  
+ *  
+ *  The driver is initialized through platform_device.  Structures which
+ *  define the configuration needed by the board are defined in a
+ *  board structure in arch/ppc/platforms (though I do not
+ *  discount the possibility that other architectures could one
+ *  day be supported.  One assumption the driver currently makes
+ *  is that the PHY is configured in such a way to advertise all
+ *  capabilities.  This is a sensible default, and on certain
+ *  PHYs, changing this default encounters substantial errata
+ *  issues.  Future versions may remove this requirement, but for
+ *  now, it is best for the firmware to ensure this is the case.
+ *
+ *  The Gianfar Ethernet Controller uses a ring of buffer
+ *  descriptors.  The beginning is indicated by a register
+ *  pointing to the physical address of the start of the ring. 
+ *  The end is determined by a "wrap" bit being set in the 
+ *  last descriptor of the ring.
+ *
+ *  When a packet is received, the RXF bit in the
+ *  IEVENT register is set, triggering an interrupt when the 
+ *  corresponding bit in the IMASK register is also set (if
+ *  interrupt coalescing is active, then the interrupt may not
+ *  happen immediately, but will wait until either a set number
+ *  of frames or amount of time have passed.).  In NAPI, the
+ *  interrupt handler will signal there is work to be done, and
+ *  exit.  Without NAPI, the packet(s) will be handled
+ *  immediately.  Both methods will start at the last known empty
+ *  descriptor, and process every subsequent descriptor until there 
+ *  are none left with data (NAPI will stop after a set number of
+ *  packets to give time to other tasks, but will eventually
+ *  process all the packets).  The data arrives inside a
+ *  pre-allocated skb, and so after the skb is passed up to the
+ *  stack, a new skb must be allocated, and the address field in
+ *  the buffer descriptor must be updated to indicate this new
+ *  skb.
+ *
+ *  When the kernel requests that a packet be transmitted, the
+ *  driver starts where it left off last time, and points the
+ *  descriptor at the buffer which was passed in.  The driver
+ *  then informs the DMA engine that there are packets ready to
+ *  be transmitted.  Once the controller is finished transmitting
+ *  the packet, an interrupt may be triggered (under the same
+ *  conditions as for reception, but depending on the TXF bit).
+ *  The driver then cleans up the buffer.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/errno.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/mm.h>
+#include <linux/device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/dma-mapping.h>
+#include <linux/crc32.h>
+
+#include "gianfar.h"
+#include "gianfar_phy.h"
+
+#define TX_TIMEOUT      (1*HZ)
+#define SKB_ALLOC_TIMEOUT 1000000
+#undef BRIEF_GFAR_ERRORS
+#undef VERBOSE_GFAR_ERRORS
+
+#ifdef CONFIG_GFAR_NAPI
+#define RECEIVE(x) netif_receive_skb(x)
+#else
+#define RECEIVE(x) netif_rx(x)
+#endif
+
+const char gfar_driver_name[] = "Gianfar Ethernet";
+const char gfar_driver_version[] = "1.1";
+
+int startup_gfar(struct net_device *dev);
+static int gfar_enet_open(struct net_device *dev);
+static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static void gfar_timeout(struct net_device *dev);
+static int gfar_close(struct net_device *dev);
+struct sk_buff *gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp);
+static struct net_device_stats *gfar_get_stats(struct net_device *dev);
+static int gfar_set_mac_address(struct net_device *dev);
+static int gfar_change_mtu(struct net_device *dev, int new_mtu);
+static irqreturn_t gfar_error(int irq, void *dev_id, struct pt_regs *regs);
+static irqreturn_t gfar_transmit(int irq, void *dev_id, struct pt_regs *regs);
+irqreturn_t gfar_receive(int irq, void *dev_id, struct pt_regs *regs);
+static irqreturn_t gfar_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static irqreturn_t phy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void gfar_phy_change(void *data);
+static void gfar_phy_timer(unsigned long data);
+static void adjust_link(struct net_device *dev);
+static void init_registers(struct net_device *dev);
+static int init_phy(struct net_device *dev);
+static int gfar_probe(struct device *device);
+static int gfar_remove(struct device *device);
+void free_skb_resources(struct gfar_private *priv);
+static void gfar_set_multi(struct net_device *dev);
+static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr);
+#ifdef CONFIG_GFAR_NAPI
+static int gfar_poll(struct net_device *dev, int *budget);
+#endif
+static int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
+static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb, int length);
+static void gfar_phy_startup_timer(unsigned long data);
+
+extern struct ethtool_ops gfar_ethtool_ops;
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc");
+MODULE_DESCRIPTION("Gianfar Ethernet Driver");
+MODULE_LICENSE("GPL");
+
+static int gfar_probe(struct device *device)
+{
+	u32 tempval;
+	struct net_device *dev = NULL;
+	struct gfar_private *priv = NULL;
+	struct platform_device *pdev = to_platform_device(device);
+	struct gianfar_platform_data *einfo;
+	struct resource *r;
+	int idx;
+	int err = 0;
+	int dev_ethtool_ops = 0;
+
+	einfo = (struct gianfar_platform_data *) pdev->dev.platform_data;
+
+	if (einfo == NULL) {
+		printk(KERN_ERR "gfar %d: Missing additional data!\n",
+		       pdev->id);
+
+		return -ENODEV;
+	}
+
+	/* Create an ethernet device instance */
+	dev = alloc_etherdev(sizeof (*priv));
+
+	if (dev == NULL)
+		return -ENOMEM;
+
+	priv = netdev_priv(dev);
+
+	/* Set the info in the priv to the current info */
+	priv->einfo = einfo;
+
+	/* fill out IRQ fields */
+	if (einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+		priv->interruptTransmit = platform_get_irq_byname(pdev, "tx");
+		priv->interruptReceive = platform_get_irq_byname(pdev, "rx");
+		priv->interruptError = platform_get_irq_byname(pdev, "error");
+	} else {
+		priv->interruptTransmit = platform_get_irq(pdev, 0);
+	}
+
+	/* get a pointer to the register memory */
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->regs = (struct gfar *)
+		ioremap(r->start, sizeof (struct gfar));
+
+	if (priv->regs == NULL) {
+		err = -ENOMEM;
+		goto regs_fail;
+	}
+
+	/* Set the PHY base address */
+	priv->phyregs = (struct gfar *)
+	    ioremap(einfo->phy_reg_addr, sizeof (struct gfar));
+
+	if (priv->phyregs == NULL) {
+		err = -ENOMEM;
+		goto phy_regs_fail;
+	}
+
+	spin_lock_init(&priv->lock);
+
+	dev_set_drvdata(device, dev);
+
+	/* Stop the DMA engine now, in case it was running before */
+	/* (The firmware could have used it, and left it running). */
+	/* To do this, we write Graceful Receive Stop and Graceful */
+	/* Transmit Stop, and then wait until the corresponding bits */
+	/* in IEVENT indicate the stops have completed. */
+	tempval = gfar_read(&priv->regs->dmactrl);
+	tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
+	gfar_write(&priv->regs->dmactrl, tempval);
+
+	tempval = gfar_read(&priv->regs->dmactrl);
+	tempval |= (DMACTRL_GRS | DMACTRL_GTS);
+	gfar_write(&priv->regs->dmactrl, tempval);
+
+	while (!(gfar_read(&priv->regs->ievent) & (IEVENT_GRSC | IEVENT_GTSC)))
+		cpu_relax();
+
+	/* Reset MAC layer */
+	gfar_write(&priv->regs->maccfg1, MACCFG1_SOFT_RESET);
+
+	tempval = (MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
+	gfar_write(&priv->regs->maccfg1, tempval);
+
+	/* Initialize MACCFG2. */
+	gfar_write(&priv->regs->maccfg2, MACCFG2_INIT_SETTINGS);
+
+	/* Initialize ECNTRL */
+	gfar_write(&priv->regs->ecntrl, ECNTRL_INIT_SETTINGS);
+
+	/* Copy the station address into the dev structure, */
+	memcpy(dev->dev_addr, einfo->mac_addr, MAC_ADDR_LEN);
+
+	/* Set the dev->base_addr to the gfar reg region */
+	dev->base_addr = (unsigned long) (priv->regs);
+
+	SET_MODULE_OWNER(dev);
+	SET_NETDEV_DEV(dev, device);
+
+	/* Fill in the dev structure */
+	dev->open = gfar_enet_open;
+	dev->hard_start_xmit = gfar_start_xmit;
+	dev->tx_timeout = gfar_timeout;
+	dev->watchdog_timeo = TX_TIMEOUT;
+#ifdef CONFIG_GFAR_NAPI
+	dev->poll = gfar_poll;
+	dev->weight = GFAR_DEV_WEIGHT;
+#endif
+	dev->stop = gfar_close;
+	dev->get_stats = gfar_get_stats;
+	dev->change_mtu = gfar_change_mtu;
+	dev->mtu = 1500;
+	dev->set_multicast_list = gfar_set_multi;
+
+	/* Index into the array of possible ethtool
+	 * ops to catch all 4 possibilities */
+	if((priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON) == 0)
+		dev_ethtool_ops += 1;
+
+	if((priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_COALESCE) == 0)
+		dev_ethtool_ops += 2;
+
+	dev->ethtool_ops = gfar_op_array[dev_ethtool_ops];
+
+	priv->rx_buffer_size = DEFAULT_RX_BUFFER_SIZE;
+#ifdef CONFIG_GFAR_BUFSTASH
+	priv->rx_stash_size = STASH_LENGTH;
+#endif
+	priv->tx_ring_size = DEFAULT_TX_RING_SIZE;
+	priv->rx_ring_size = DEFAULT_RX_RING_SIZE;
+
+	priv->txcoalescing = DEFAULT_TX_COALESCE;
+	priv->txcount = DEFAULT_TXCOUNT;
+	priv->txtime = DEFAULT_TXTIME;
+	priv->rxcoalescing = DEFAULT_RX_COALESCE;
+	priv->rxcount = DEFAULT_RXCOUNT;
+	priv->rxtime = DEFAULT_RXTIME;
+
+	err = register_netdev(dev);
+
+	if (err) {
+		printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
+				dev->name);
+		goto register_fail;
+	}
+
+	/* Print out the device info */
+	printk(KERN_INFO DEVICE_NAME, dev->name);
+	for (idx = 0; idx < 6; idx++)
+		printk("%2.2x%c", dev->dev_addr[idx], idx == 5 ? ' ' : ':');
+	printk("\n");
+
+	/* Even more device info helps when determining which kernel */
+	/* provided which set of benchmarks.  Since this is global for all */
+	/* devices, we only print it once */
+#ifdef CONFIG_GFAR_NAPI
+	printk(KERN_INFO "%s: Running with NAPI enabled\n", dev->name);
+#else
+	printk(KERN_INFO "%s: Running with NAPI disabled\n", dev->name);
+#endif
+	printk(KERN_INFO "%s: %d/%d RX/TX BD ring size\n",
+	       dev->name, priv->rx_ring_size, priv->tx_ring_size);
+
+	return 0;
+
+register_fail:
+	iounmap((void *) priv->phyregs);
+phy_regs_fail:
+	iounmap((void *) priv->regs);
+regs_fail:
+	free_netdev(dev);
+	return -ENOMEM;
+}
+
+static int gfar_remove(struct device *device)
+{
+	struct net_device *dev = dev_get_drvdata(device);
+	struct gfar_private *priv = netdev_priv(dev);
+
+	dev_set_drvdata(device, NULL);
+
+	iounmap((void *) priv->regs);
+	iounmap((void *) priv->phyregs);
+	free_netdev(dev);
+
+	return 0;
+}
+
+
+/* Configure the PHY for dev.
+ * returns 0 if success.  -1 if failure
+ */
+static int init_phy(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct phy_info *curphy;
+	unsigned int timeout = PHY_INIT_TIMEOUT;
+	struct gfar *phyregs = priv->phyregs;
+	struct gfar_mii_info *mii_info;
+	int err;
+
+	priv->oldlink = 0;
+	priv->oldspeed = 0;
+	priv->oldduplex = -1;
+
+	mii_info = kmalloc(sizeof(struct gfar_mii_info),
+			GFP_KERNEL);
+
+	if(NULL == mii_info) {
+		printk(KERN_ERR "%s: Could not allocate mii_info\n", 
+				dev->name);
+		return -ENOMEM;
+	}
+
+	mii_info->speed = SPEED_1000;
+	mii_info->duplex = DUPLEX_FULL;
+	mii_info->pause = 0;
+	mii_info->link = 1;
+
+	mii_info->advertising = (ADVERTISED_10baseT_Half |
+			ADVERTISED_10baseT_Full |
+			ADVERTISED_100baseT_Half |
+			ADVERTISED_100baseT_Full |
+			ADVERTISED_1000baseT_Full);
+	mii_info->autoneg = 1;
+
+	spin_lock_init(&mii_info->mdio_lock);
+
+	mii_info->mii_id = priv->einfo->phyid;
+
+	mii_info->dev = dev;
+
+	mii_info->mdio_read = &read_phy_reg;
+	mii_info->mdio_write = &write_phy_reg;
+
+	priv->mii_info = mii_info;
+
+	/* Reset the management interface */
+	gfar_write(&phyregs->miimcfg, MIIMCFG_RESET);
+
+	/* Setup the MII Mgmt clock speed */
+	gfar_write(&phyregs->miimcfg, MIIMCFG_INIT_VALUE);
+
+	/* Wait until the bus is free */
+	while ((gfar_read(&phyregs->miimind) & MIIMIND_BUSY) &&
+			timeout--)
+		cpu_relax();
+
+	if(timeout <= 0) {
+		printk(KERN_ERR "%s: The MII Bus is stuck!\n",
+				dev->name);
+		err = -1;
+		goto bus_fail;
+	}
+
+	/* get info for this PHY */
+	curphy = get_phy_info(priv->mii_info);
+
+	if (curphy == NULL) {
+		printk(KERN_ERR "%s: No PHY found\n", dev->name);
+		err = -1;
+		goto no_phy;
+	}
+
+	mii_info->phyinfo = curphy;
+
+	/* Run the commands which initialize the PHY */
+	if(curphy->init) {
+		err = curphy->init(priv->mii_info);
+
+		if (err) 
+			goto phy_init_fail;
+	}
+
+	return 0;
+
+phy_init_fail:
+no_phy:
+bus_fail:
+	kfree(mii_info);
+
+	return err;
+}
+
+static void init_registers(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Clear IEVENT */
+	gfar_write(&priv->regs->ievent, IEVENT_INIT_CLEAR);
+
+	/* Initialize IMASK */
+	gfar_write(&priv->regs->imask, IMASK_INIT_CLEAR);
+
+	/* Init hash registers to zero */
+	gfar_write(&priv->regs->iaddr0, 0);
+	gfar_write(&priv->regs->iaddr1, 0);
+	gfar_write(&priv->regs->iaddr2, 0);
+	gfar_write(&priv->regs->iaddr3, 0);
+	gfar_write(&priv->regs->iaddr4, 0);
+	gfar_write(&priv->regs->iaddr5, 0);
+	gfar_write(&priv->regs->iaddr6, 0);
+	gfar_write(&priv->regs->iaddr7, 0);
+
+	gfar_write(&priv->regs->gaddr0, 0);
+	gfar_write(&priv->regs->gaddr1, 0);
+	gfar_write(&priv->regs->gaddr2, 0);
+	gfar_write(&priv->regs->gaddr3, 0);
+	gfar_write(&priv->regs->gaddr4, 0);
+	gfar_write(&priv->regs->gaddr5, 0);
+	gfar_write(&priv->regs->gaddr6, 0);
+	gfar_write(&priv->regs->gaddr7, 0);
+
+	/* Zero out rctrl */
+	gfar_write(&priv->regs->rctrl, 0x00000000);
+
+	/* Zero out the rmon mib registers if it has them */
+	if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
+		memset((void *) &(priv->regs->rmon), 0,
+		       sizeof (struct rmon_mib));
+
+		/* Mask off the CAM interrupts */
+		gfar_write(&priv->regs->rmon.cam1, 0xffffffff);
+		gfar_write(&priv->regs->rmon.cam2, 0xffffffff);
+	}
+
+	/* Initialize the max receive buffer length */
+	gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
+
+#ifdef CONFIG_GFAR_BUFSTASH
+	/* If we are stashing buffers, we need to set the
+	 * extraction length to the size of the buffer */
+	gfar_write(&priv->regs->attreli, priv->rx_stash_size << 16);
+#endif
+
+	/* Initialize the Minimum Frame Length Register */
+	gfar_write(&priv->regs->minflr, MINFLR_INIT_SETTINGS);
+
+	/* Setup Attributes so that snooping is on for rx */
+	gfar_write(&priv->regs->attr, ATTR_INIT_SETTINGS);
+	gfar_write(&priv->regs->attreli, ATTRELI_INIT_SETTINGS);
+
+	/* Assign the TBI an address which won't conflict with the PHYs */
+	gfar_write(&priv->regs->tbipa, TBIPA_VALUE);
+}
+
+void stop_gfar(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar *regs = priv->regs;
+	unsigned long flags;
+	u32 tempval;
+
+	/* Lock it down */
+	spin_lock_irqsave(&priv->lock, flags);
+
+	/* Tell the kernel the link is down */
+	priv->mii_info->link = 0;
+	adjust_link(dev);
+
+	/* Mask all interrupts */
+	gfar_write(&regs->imask, IMASK_INIT_CLEAR);
+
+	/* Clear all interrupts */
+	gfar_write(&regs->ievent, IEVENT_INIT_CLEAR);
+
+	/* Stop the DMA, and wait for it to stop */
+	tempval = gfar_read(&priv->regs->dmactrl);
+	if ((tempval & (DMACTRL_GRS | DMACTRL_GTS))
+	    != (DMACTRL_GRS | DMACTRL_GTS)) {
+		tempval |= (DMACTRL_GRS | DMACTRL_GTS);
+		gfar_write(&priv->regs->dmactrl, tempval);
+
+		while (!(gfar_read(&priv->regs->ievent) &
+			 (IEVENT_GRSC | IEVENT_GTSC)))
+			cpu_relax();
+	}
+
+	/* Disable Rx and Tx */
+	tempval = gfar_read(&regs->maccfg1);
+	tempval &= ~(MACCFG1_RX_EN | MACCFG1_TX_EN);
+	gfar_write(&regs->maccfg1, tempval);
+
+	if (priv->einfo->board_flags & FSL_GIANFAR_BRD_HAS_PHY_INTR) {
+		/* Clear any pending interrupts */
+		mii_clear_phy_interrupt(priv->mii_info);
+
+		/* Disable PHY Interrupts */
+		mii_configure_phy_interrupt(priv->mii_info, 
+				MII_INTERRUPT_DISABLED);
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	/* Free the IRQs */
+	if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+		free_irq(priv->interruptError, dev);
+		free_irq(priv->interruptTransmit, dev);
+		free_irq(priv->interruptReceive, dev);
+	} else {
+		free_irq(priv->interruptTransmit, dev);
+	}
+
+	if (priv->einfo->board_flags & FSL_GIANFAR_BRD_HAS_PHY_INTR) {
+		free_irq(priv->einfo->interruptPHY, dev);
+	} else {
+		del_timer_sync(&priv->phy_info_timer);
+	}
+
+	free_skb_resources(priv);
+
+	dma_free_coherent(NULL,
+			sizeof(struct txbd8)*priv->tx_ring_size
+			+ sizeof(struct rxbd8)*priv->rx_ring_size,
+			priv->tx_bd_base,
+			gfar_read(&regs->tbase));
+}
+
+/* If there are any tx skbs or rx skbs still around, free them.
+ * Then free tx_skbuff and rx_skbuff */
+void free_skb_resources(struct gfar_private *priv)
+{
+	struct rxbd8 *rxbdp;
+	struct txbd8 *txbdp;
+	int i;
+
+	/* Go through all the buffer descriptors and free their data buffers */
+	txbdp = priv->tx_bd_base;
+
+	for (i = 0; i < priv->tx_ring_size; i++) {
+
+		if (priv->tx_skbuff[i]) {
+			dma_unmap_single(NULL, txbdp->bufPtr,
+					txbdp->length,
+					DMA_TO_DEVICE);
+			dev_kfree_skb_any(priv->tx_skbuff[i]);
+			priv->tx_skbuff[i] = NULL;
+		}
+	}
+
+	kfree(priv->tx_skbuff);
+
+	rxbdp = priv->rx_bd_base;
+
+	/* rx_skbuff is not guaranteed to be allocated, so only
+	 * free it and its contents if it is allocated */
+	if(priv->rx_skbuff != NULL) {
+		for (i = 0; i < priv->rx_ring_size; i++) {
+			if (priv->rx_skbuff[i]) {
+				dma_unmap_single(NULL, rxbdp->bufPtr,
+						priv->rx_buffer_size
+						+ RXBUF_ALIGNMENT,
+						DMA_FROM_DEVICE);
+
+				dev_kfree_skb_any(priv->rx_skbuff[i]);
+				priv->rx_skbuff[i] = NULL;
+			}
+
+			rxbdp->status = 0;
+			rxbdp->length = 0;
+			rxbdp->bufPtr = 0;
+
+			rxbdp++;
+		}
+
+		kfree(priv->rx_skbuff);
+	}
+}
+
+/* Bring the controller up and running */
+int startup_gfar(struct net_device *dev)
+{
+	struct txbd8 *txbdp;
+	struct rxbd8 *rxbdp;
+	dma_addr_t addr;
+	unsigned long vaddr;
+	int i;
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar *regs = priv->regs;
+	u32 tempval;
+	int err = 0;
+
+	gfar_write(&regs->imask, IMASK_INIT_CLEAR);
+
+	/* Allocate memory for the buffer descriptors */
+	vaddr = (unsigned long) dma_alloc_coherent(NULL, 
+			sizeof (struct txbd8) * priv->tx_ring_size +
+			sizeof (struct rxbd8) * priv->rx_ring_size,
+			&addr, GFP_KERNEL);
+
+	if (vaddr == 0) {
+		printk(KERN_ERR "%s: Could not allocate buffer descriptors!\n",
+		       dev->name);
+		return -ENOMEM;
+	}
+
+	priv->tx_bd_base = (struct txbd8 *) vaddr;
+
+	/* enet DMA only understands physical addresses */
+	gfar_write(&regs->tbase, addr);
+
+	/* Start the rx descriptor ring where the tx ring leaves off */
+	addr = addr + sizeof (struct txbd8) * priv->tx_ring_size;
+	vaddr = vaddr + sizeof (struct txbd8) * priv->tx_ring_size;
+	priv->rx_bd_base = (struct rxbd8 *) vaddr;
+	gfar_write(&regs->rbase, addr);
+
+	/* Setup the skbuff rings */
+	priv->tx_skbuff =
+	    (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
+					priv->tx_ring_size, GFP_KERNEL);
+
+	if (priv->tx_skbuff == NULL) {
+		printk(KERN_ERR "%s: Could not allocate tx_skbuff\n",
+		       dev->name);
+		err = -ENOMEM;
+		goto tx_skb_fail;
+	}
+
+	for (i = 0; i < priv->tx_ring_size; i++)
+		priv->tx_skbuff[i] = NULL;
+
+	priv->rx_skbuff =
+	    (struct sk_buff **) kmalloc(sizeof (struct sk_buff *) *
+					priv->rx_ring_size, GFP_KERNEL);
+
+	if (priv->rx_skbuff == NULL) {
+		printk(KERN_ERR "%s: Could not allocate rx_skbuff\n",
+		       dev->name);
+		err = -ENOMEM;
+		goto rx_skb_fail;
+	}
+
+	for (i = 0; i < priv->rx_ring_size; i++)
+		priv->rx_skbuff[i] = NULL;
+
+	/* Initialize some variables in our dev structure */
+	priv->dirty_tx = priv->cur_tx = priv->tx_bd_base;
+	priv->cur_rx = priv->rx_bd_base;
+	priv->skb_curtx = priv->skb_dirtytx = 0;
+	priv->skb_currx = 0;
+
+	/* Initialize Transmit Descriptor Ring */
+	txbdp = priv->tx_bd_base;
+	for (i = 0; i < priv->tx_ring_size; i++) {
+		txbdp->status = 0;
+		txbdp->length = 0;
+		txbdp->bufPtr = 0;
+		txbdp++;
+	}
+
+	/* Set the last descriptor in the ring to indicate wrap */
+	txbdp--;
+	txbdp->status |= TXBD_WRAP;
+
+	rxbdp = priv->rx_bd_base;
+	for (i = 0; i < priv->rx_ring_size; i++) {
+		struct sk_buff *skb = NULL;
+
+		rxbdp->status = 0;
+
+		skb = gfar_new_skb(dev, rxbdp);
+
+		priv->rx_skbuff[i] = skb;
+
+		rxbdp++;
+	}
+
+	/* Set the last descriptor in the ring to wrap */
+	rxbdp--;
+	rxbdp->status |= RXBD_WRAP;
+
+	/* If the device has multiple interrupts, register for
+	 * them.  Otherwise, only register for the one */
+	if (priv->einfo->device_flags & FSL_GIANFAR_DEV_HAS_MULTI_INTR) {
+		/* Install our interrupt handlers for Error, 
+		 * Transmit, and Receive */
+		if (request_irq(priv->interruptError, gfar_error,
+				0, "enet_error", dev) < 0) {
+			printk(KERN_ERR "%s: Can't get IRQ %d\n",
+			       dev->name, priv->interruptError);
+
+			err = -1;
+			goto err_irq_fail;
+		}
+
+		if (request_irq(priv->interruptTransmit, gfar_transmit,
+				0, "enet_tx", dev) < 0) {
+			printk(KERN_ERR "%s: Can't get IRQ %d\n",
+			       dev->name, priv->interruptTransmit);
+
+			err = -1;
+
+			goto tx_irq_fail;
+		}
+
+		if (request_irq(priv->interruptReceive, gfar_receive,
+				0, "enet_rx", dev) < 0) {
+			printk(KERN_ERR "%s: Can't get IRQ %d (receive0)\n",
+			       dev->name, priv->interruptReceive);
+
+			err = -1;
+			goto rx_irq_fail;
+		}
+	} else {
+		if (request_irq(priv->interruptTransmit, gfar_interrupt,
+				0, "gfar_interrupt", dev) < 0) {
+			printk(KERN_ERR "%s: Can't get IRQ %d\n",
+			       dev->name, priv->interruptError);
+
+			err = -1;
+			goto err_irq_fail;
+		}
+	}
+
+	/* Set up the PHY change work queue */
+	INIT_WORK(&priv->tq, gfar_phy_change, dev);
+
+	init_timer(&priv->phy_info_timer);
+	priv->phy_info_timer.function = &gfar_phy_startup_timer;
+	priv->phy_info_timer.data = (unsigned long) priv->mii_info;
+	mod_timer(&priv->phy_info_timer, jiffies + HZ);
+
+	/* Configure the coalescing support */
+	if (priv->txcoalescing)
+		gfar_write(&regs->txic,
+			   mk_ic_value(priv->txcount, priv->txtime));
+	else
+		gfar_write(&regs->txic, 0);
+
+	if (priv->rxcoalescing)
+		gfar_write(&regs->rxic,
+			   mk_ic_value(priv->rxcount, priv->rxtime));
+	else
+		gfar_write(&regs->rxic, 0);
+
+	init_waitqueue_head(&priv->rxcleanupq);
+
+	/* Enable Rx and Tx in MACCFG1 */
+	tempval = gfar_read(&regs->maccfg1);
+	tempval |= (MACCFG1_RX_EN | MACCFG1_TX_EN);
+	gfar_write(&regs->maccfg1, tempval);
+
+	/* Initialize DMACTRL to have WWR and WOP */
+	tempval = gfar_read(&priv->regs->dmactrl);
+	tempval |= DMACTRL_INIT_SETTINGS;
+	gfar_write(&priv->regs->dmactrl, tempval);
+
+	/* Clear THLT, so that the DMA starts polling now */
+	gfar_write(&regs->tstat, TSTAT_CLEAR_THALT);
+
+	/* Make sure we aren't stopped */
+	tempval = gfar_read(&priv->regs->dmactrl);
+	tempval &= ~(DMACTRL_GRS | DMACTRL_GTS);
+	gfar_write(&priv->regs->dmactrl, tempval);
+
+	/* Unmask the interrupts we look for */
+	gfar_write(&regs->imask, IMASK_DEFAULT);
+
+	return 0;
+
+rx_irq_fail:
+	free_irq(priv->interruptTransmit, dev);
+tx_irq_fail:
+	free_irq(priv->interruptError, dev);
+err_irq_fail:
+rx_skb_fail:
+	free_skb_resources(priv);
+tx_skb_fail:
+	dma_free_coherent(NULL,
+			sizeof(struct txbd8)*priv->tx_ring_size
+			+ sizeof(struct rxbd8)*priv->rx_ring_size,
+			priv->tx_bd_base,
+			gfar_read(&regs->tbase));
+
+	if (priv->mii_info->phyinfo->close)
+		priv->mii_info->phyinfo->close(priv->mii_info);
+
+	kfree(priv->mii_info);
+
+	return err;
+}
+
+/* Called when something needs to use the ethernet device */
+/* Returns 0 for success. */
+static int gfar_enet_open(struct net_device *dev)
+{
+	int err;
+
+	/* Initialize a bunch of registers */
+	init_registers(dev);
+
+	gfar_set_mac_address(dev);
+
+	err = init_phy(dev);
+
+	if(err)
+		return err;
+
+	err = startup_gfar(dev);
+
+	netif_start_queue(dev);
+
+	return err;
+}
+
+/* This is called by the kernel when a frame is ready for transmission. */
+/* It is pointed to by the dev->hard_start_xmit function pointer */
+static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct txbd8 *txbdp;
+
+	/* Update transmit stats */
+	priv->stats.tx_bytes += skb->len;
+
+	/* Lock priv now */
+	spin_lock_irq(&priv->lock);
+
+	/* Point at the first free tx descriptor */
+	txbdp = priv->cur_tx;
+
+	/* Clear all but the WRAP status flags */
+	txbdp->status &= TXBD_WRAP;
+
+	/* Set buffer length and pointer */
+	txbdp->length = skb->len;
+	txbdp->bufPtr = dma_map_single(NULL, skb->data, 
+			skb->len, DMA_TO_DEVICE);
+
+	/* Save the skb pointer so we can free it later */
+	priv->tx_skbuff[priv->skb_curtx] = skb;
+
+	/* Update the current skb pointer (wrapping if this was the last) */
+	priv->skb_curtx =
+	    (priv->skb_curtx + 1) & TX_RING_MOD_MASK(priv->tx_ring_size);
+
+	/* Flag the BD as interrupt-causing */
+	txbdp->status |= TXBD_INTERRUPT;
+
+	/* Flag the BD as ready to go, last in frame, and  */
+	/* in need of CRC */
+	txbdp->status |= (TXBD_READY | TXBD_LAST | TXBD_CRC);
+
+	dev->trans_start = jiffies;
+
+	/* If this was the last BD in the ring, the next one */
+	/* is at the beginning of the ring */
+	if (txbdp->status & TXBD_WRAP)
+		txbdp = priv->tx_bd_base;
+	else
+		txbdp++;
+
+	/* If the next BD still needs to be cleaned up, then the bds
+	   are full.  We need to tell the kernel to stop sending us stuff. */
+	if (txbdp == priv->dirty_tx) {
+		netif_stop_queue(dev);
+
+		priv->stats.tx_fifo_errors++;
+	}
+
+	/* Update the current txbd to the next one */
+	priv->cur_tx = txbdp;
+
+	/* Tell the DMA to go go go */
+	gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
+
+	/* Unlock priv */
+	spin_unlock_irq(&priv->lock);
+
+	return 0;
+}
+
+/* Stops the kernel queue, and halts the controller */
+static int gfar_close(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	stop_gfar(dev);
+
+	/* Shutdown the PHY */
+	if (priv->mii_info->phyinfo->close)
+		priv->mii_info->phyinfo->close(priv->mii_info);
+
+	kfree(priv->mii_info);
+
+	netif_stop_queue(dev);
+
+	return 0;
+}
+
+/* returns a net_device_stats structure pointer */
+static struct net_device_stats * gfar_get_stats(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	return &(priv->stats);
+}
+
+/* Changes the mac address if the controller is not running. */
+int gfar_set_mac_address(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	int i;
+	char tmpbuf[MAC_ADDR_LEN];
+	u32 tempval;
+
+	/* Now copy it into the mac registers backwards, cuz */
+	/* little endian is silly */
+	for (i = 0; i < MAC_ADDR_LEN; i++)
+		tmpbuf[MAC_ADDR_LEN - 1 - i] = dev->dev_addr[i];
+
+	gfar_write(&priv->regs->macstnaddr1, *((u32 *) (tmpbuf)));
+
+	tempval = *((u32 *) (tmpbuf + 4));
+
+	gfar_write(&priv->regs->macstnaddr2, tempval);
+
+	return 0;
+}
+
+
+static int gfar_change_mtu(struct net_device *dev, int new_mtu)
+{
+	int tempsize, tempval;
+	struct gfar_private *priv = netdev_priv(dev);
+	int oldsize = priv->rx_buffer_size;
+	int frame_size = new_mtu + 18;
+
+	if ((frame_size < 64) || (frame_size > JUMBO_FRAME_SIZE)) {
+		printk(KERN_ERR "%s: Invalid MTU setting\n", dev->name);
+		return -EINVAL;
+	}
+
+	tempsize =
+	    (frame_size & ~(INCREMENTAL_BUFFER_SIZE - 1)) +
+	    INCREMENTAL_BUFFER_SIZE;
+
+	/* Only stop and start the controller if it isn't already
+	 * stopped */
+	if ((oldsize != tempsize) && (dev->flags & IFF_UP))
+		stop_gfar(dev);
+
+	priv->rx_buffer_size = tempsize;
+
+	dev->mtu = new_mtu;
+
+	gfar_write(&priv->regs->mrblr, priv->rx_buffer_size);
+	gfar_write(&priv->regs->maxfrm, priv->rx_buffer_size);
+
+	/* If the mtu is larger than the max size for standard
+	 * ethernet frames (ie, a jumbo frame), then set maccfg2
+	 * to allow huge frames, and to check the length */
+	tempval = gfar_read(&priv->regs->maccfg2);
+
+	if (priv->rx_buffer_size > DEFAULT_RX_BUFFER_SIZE)
+		tempval |= (MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
+	else
+		tempval &= ~(MACCFG2_HUGEFRAME | MACCFG2_LENGTHCHECK);
+
+	gfar_write(&priv->regs->maccfg2, tempval);
+
+	if ((oldsize != tempsize) && (dev->flags & IFF_UP))
+		startup_gfar(dev);
+
+	return 0;
+}
+
+/* gfar_timeout gets called when a packet has not been
+ * transmitted after a set amount of time.
+ * For now, assume that clearing out all the structures, and
+ * starting over will fix the problem. */
+static void gfar_timeout(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	priv->stats.tx_errors++;
+
+	if (dev->flags & IFF_UP) {
+		stop_gfar(dev);
+		startup_gfar(dev);
+	}
+
+	netif_schedule(dev);
+}
+
+/* Interrupt Handler for Transmit complete */
+static irqreturn_t gfar_transmit(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct gfar_private *priv = netdev_priv(dev);
+	struct txbd8 *bdp;
+
+	/* Clear IEVENT */
+	gfar_write(&priv->regs->ievent, IEVENT_TX_MASK);
+
+	/* Lock priv */
+	spin_lock(&priv->lock);
+	bdp = priv->dirty_tx;
+	while ((bdp->status & TXBD_READY) == 0) {
+		/* If dirty_tx and cur_tx are the same, then either the */
+		/* ring is empty or full now (it could only be full in the beginning, */
+		/* obviously).  If it is empty, we are done. */
+		if ((bdp == priv->cur_tx) && (netif_queue_stopped(dev) == 0))
+			break;
+
+		priv->stats.tx_packets++;
+
+		/* Deferred means some collisions occurred during transmit, */
+		/* but we eventually sent the packet. */
+		if (bdp->status & TXBD_DEF)
+			priv->stats.collisions++;
+
+		/* Free the sk buffer associated with this TxBD */
+		dev_kfree_skb_irq(priv->tx_skbuff[priv->skb_dirtytx]);
+		priv->tx_skbuff[priv->skb_dirtytx] = NULL;
+		priv->skb_dirtytx =
+		    (priv->skb_dirtytx +
+		     1) & TX_RING_MOD_MASK(priv->tx_ring_size);
+
+		/* update bdp to point at next bd in the ring (wrapping if necessary) */
+		if (bdp->status & TXBD_WRAP)
+			bdp = priv->tx_bd_base;
+		else
+			bdp++;
+
+		/* Move dirty_tx to be the next bd */
+		priv->dirty_tx = bdp;
+
+		/* We freed a buffer, so now we can restart transmission */
+		if (netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+	} /* while ((bdp->status & TXBD_READY) == 0) */
+
+	/* If we are coalescing the interrupts, reset the timer */
+	/* Otherwise, clear it */
+	if (priv->txcoalescing)
+		gfar_write(&priv->regs->txic,
+			   mk_ic_value(priv->txcount, priv->txtime));
+	else
+		gfar_write(&priv->regs->txic, 0);
+
+	spin_unlock(&priv->lock);
+
+	return IRQ_HANDLED;
+}
+
+struct sk_buff * gfar_new_skb(struct net_device *dev, struct rxbd8 *bdp)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct sk_buff *skb = NULL;
+	unsigned int timeout = SKB_ALLOC_TIMEOUT;
+
+	/* We have to allocate the skb, so keep trying till we succeed */
+	while ((!skb) && timeout--)
+		skb = dev_alloc_skb(priv->rx_buffer_size + RXBUF_ALIGNMENT);
+
+	if (skb == NULL)
+		return NULL;
+
+	/* We need the data buffer to be aligned properly.  We will reserve
+	 * as many bytes as needed to align the data properly
+	 */
+	skb_reserve(skb,
+		    RXBUF_ALIGNMENT -
+		    (((unsigned) skb->data) & (RXBUF_ALIGNMENT - 1)));
+
+	skb->dev = dev;
+
+	bdp->bufPtr = dma_map_single(NULL, skb->data,
+			priv->rx_buffer_size + RXBUF_ALIGNMENT, 
+			DMA_FROM_DEVICE);
+
+	bdp->length = 0;
+
+	/* Mark the buffer empty */
+	bdp->status |= (RXBD_EMPTY | RXBD_INTERRUPT);
+
+	return skb;
+}
+
+static inline void count_errors(unsigned short status, struct gfar_private *priv)
+{
+	struct net_device_stats *stats = &priv->stats;
+	struct gfar_extra_stats *estats = &priv->extra_stats;
+
+	/* If the packet was truncated, none of the other errors
+	 * matter */
+	if (status & RXBD_TRUNCATED) {
+		stats->rx_length_errors++;
+
+		estats->rx_trunc++;
+
+		return;
+	}
+	/* Count the errors, if there were any */
+	if (status & (RXBD_LARGE | RXBD_SHORT)) {
+		stats->rx_length_errors++;
+
+		if (status & RXBD_LARGE)
+			estats->rx_large++;
+		else
+			estats->rx_short++;
+	}
+	if (status & RXBD_NONOCTET) {
+		stats->rx_frame_errors++;
+		estats->rx_nonoctet++;
+	}
+	if (status & RXBD_CRCERR) {
+		estats->rx_crcerr++;
+		stats->rx_crc_errors++;
+	}
+	if (status & RXBD_OVERRUN) {
+		estats->rx_overrun++;
+		stats->rx_crc_errors++;
+	}
+}
+
+irqreturn_t gfar_receive(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct gfar_private *priv = netdev_priv(dev);
+
+#ifdef CONFIG_GFAR_NAPI
+	u32 tempval;
+#endif
+
+	/* Clear IEVENT, so rx interrupt isn't called again
+	 * because of this interrupt */
+	gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
+
+	/* support NAPI */
+#ifdef CONFIG_GFAR_NAPI
+	if (netif_rx_schedule_prep(dev)) {
+		tempval = gfar_read(&priv->regs->imask);
+		tempval &= IMASK_RX_DISABLED;
+		gfar_write(&priv->regs->imask, tempval);
+
+		__netif_rx_schedule(dev);
+	} else {
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: receive called twice (%x)[%x]\n",
+		       dev->name, gfar_read(&priv->regs->ievent),
+		       gfar_read(&priv->regs->imask));
+#endif
+	}
+#else
+
+	spin_lock(&priv->lock);
+	gfar_clean_rx_ring(dev, priv->rx_ring_size);
+
+	/* If we are coalescing interrupts, update the timer */
+	/* Otherwise, clear it */
+	if (priv->rxcoalescing)
+		gfar_write(&priv->regs->rxic,
+			   mk_ic_value(priv->rxcount, priv->rxtime));
+	else
+		gfar_write(&priv->regs->rxic, 0);
+
+	/* Just in case we need to wake the ring param changer */
+	priv->rxclean = 1;
+
+	spin_unlock(&priv->lock);
+#endif
+
+	return IRQ_HANDLED;
+}
+
+
+/* gfar_process_frame() -- handle one incoming packet if skb
+ * isn't NULL.  */
+static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
+		int length)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+
+	if (skb == NULL) {
+#ifdef BRIEF_GFAR_ERRORS
+		printk(KERN_WARNING "%s: Missing skb!!.\n",
+				dev->name);
+#endif
+		priv->stats.rx_dropped++;
+		priv->extra_stats.rx_skbmissing++;
+	} else {
+		/* Prep the skb for the packet */
+		skb_put(skb, length);
+
+		/* Tell the skb what kind of packet this is */
+		skb->protocol = eth_type_trans(skb, dev);
+
+		/* Send the packet up the stack */
+		if (RECEIVE(skb) == NET_RX_DROP) {
+			priv->extra_stats.kernel_dropped++;
+		}
+	}
+
+	return 0;
+}
+
+/* gfar_clean_rx_ring() -- Processes each frame in the rx ring
+ *   until the budget/quota has been reached. Returns the number 
+ *   of frames handled
+ */
+static int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
+{
+	struct rxbd8 *bdp;
+	struct sk_buff *skb;
+	u16 pkt_len;
+	int howmany = 0;
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Get the first full descriptor */
+	bdp = priv->cur_rx;
+
+	while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
+		skb = priv->rx_skbuff[priv->skb_currx];
+
+		if (!(bdp->status &
+		      (RXBD_LARGE | RXBD_SHORT | RXBD_NONOCTET
+		       | RXBD_CRCERR | RXBD_OVERRUN | RXBD_TRUNCATED))) {
+			/* Increment the number of packets */
+			priv->stats.rx_packets++;
+			howmany++;
+
+			/* Remove the FCS from the packet length */
+			pkt_len = bdp->length - 4;
+
+			gfar_process_frame(dev, skb, pkt_len);
+
+			priv->stats.rx_bytes += pkt_len;
+		} else {
+			count_errors(bdp->status, priv);
+
+			if (skb)
+				dev_kfree_skb_any(skb);
+
+			priv->rx_skbuff[priv->skb_currx] = NULL;
+		}
+
+		dev->last_rx = jiffies;
+
+		/* Clear the status flags for this buffer */
+		bdp->status &= ~RXBD_STATS;
+
+		/* Add another skb for the future */
+		skb = gfar_new_skb(dev, bdp);
+		priv->rx_skbuff[priv->skb_currx] = skb;
+
+		/* Update to the next pointer */
+		if (bdp->status & RXBD_WRAP)
+			bdp = priv->rx_bd_base;
+		else
+			bdp++;
+
+		/* update to point at the next skb */
+		priv->skb_currx =
+		    (priv->skb_currx +
+		     1) & RX_RING_MOD_MASK(priv->rx_ring_size);
+
+	}
+
+	/* Update the current rxbd pointer to be the next one */
+	priv->cur_rx = bdp;
+
+	/* If no packets have arrived since the
+	 * last one we processed, clear the IEVENT RX and
+	 * BSY bits so that another interrupt won't be
+	 * generated when we set IMASK */
+	if (bdp->status & RXBD_EMPTY)
+		gfar_write(&priv->regs->ievent, IEVENT_RX_MASK);
+
+	return howmany;
+}
+
+#ifdef CONFIG_GFAR_NAPI
+static int gfar_poll(struct net_device *dev, int *budget)
+{
+	int howmany;
+	struct gfar_private *priv = netdev_priv(dev);
+	int rx_work_limit = *budget;
+
+	if (rx_work_limit > dev->quota)
+		rx_work_limit = dev->quota;
+
+	howmany = gfar_clean_rx_ring(dev, rx_work_limit);
+
+	dev->quota -= howmany;
+	rx_work_limit -= howmany;
+	*budget -= howmany;
+
+	if (rx_work_limit >= 0) {
+		netif_rx_complete(dev);
+
+		/* Clear the halt bit in RSTAT */
+		gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
+
+		gfar_write(&priv->regs->imask, IMASK_DEFAULT);
+
+		/* If we are coalescing interrupts, update the timer */
+		/* Otherwise, clear it */
+		if (priv->rxcoalescing)
+			gfar_write(&priv->regs->rxic,
+				   mk_ic_value(priv->rxcount, priv->rxtime));
+		else
+			gfar_write(&priv->regs->rxic, 0);
+
+		/* Signal to the ring size changer that it's safe to go */
+		priv->rxclean = 1;
+	}
+
+	return (rx_work_limit < 0) ? 1 : 0;
+}
+#endif
+
+/* The interrupt handler for devices with one interrupt */
+static irqreturn_t gfar_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Save ievent for future reference */
+	u32 events = gfar_read(&priv->regs->ievent);
+
+	/* Clear IEVENT */
+	gfar_write(&priv->regs->ievent, events);
+
+	/* Check for reception */
+	if ((events & IEVENT_RXF0) || (events & IEVENT_RXB0))
+		gfar_receive(irq, dev_id, regs);
+
+	/* Check for transmit completion */
+	if ((events & IEVENT_TXF) || (events & IEVENT_TXB))
+		gfar_transmit(irq, dev_id, regs);
+
+	/* Update error statistics */
+	if (events & IEVENT_TXE) {
+		priv->stats.tx_errors++;
+
+		if (events & IEVENT_LC)
+			priv->stats.tx_window_errors++;
+		if (events & IEVENT_CRL)
+			priv->stats.tx_aborted_errors++;
+		if (events & IEVENT_XFUN) {
+#ifdef VERBOSE_GFAR_ERRORS
+			printk(KERN_WARNING "%s: tx underrun. dropped packet\n",
+			       dev->name);
+#endif
+			priv->stats.tx_dropped++;
+			priv->extra_stats.tx_underrun++;
+
+			/* Reactivate the Tx Queues */
+			gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
+		}
+	}
+	if (events & IEVENT_BSY) {
+		priv->stats.rx_errors++;
+		priv->extra_stats.rx_bsy++;
+
+		gfar_receive(irq, dev_id, regs);
+
+#ifndef CONFIG_GFAR_NAPI
+		/* Clear the halt bit in RSTAT */
+		gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
+#endif
+
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: busy error (rhalt: %x)\n", dev->name,
+		       gfar_read(&priv->regs->rstat));
+#endif
+	}
+	if (events & IEVENT_BABR) {
+		priv->stats.rx_errors++;
+		priv->extra_stats.rx_babr++;
+
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: babbling error\n", dev->name);
+#endif
+	}
+	if (events & IEVENT_EBERR) {
+		priv->extra_stats.eberr++;
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: EBERR\n", dev->name);
+#endif
+	}
+	if (events & IEVENT_RXC) {
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: control frame\n", dev->name);
+#endif
+	}
+
+	if (events & IEVENT_BABT) {
+		priv->extra_stats.tx_babt++;
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: babt error\n", dev->name);
+#endif
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t phy_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Clear the interrupt */
+	mii_clear_phy_interrupt(priv->mii_info);
+
+	/* Disable PHY interrupts */
+	mii_configure_phy_interrupt(priv->mii_info,
+			MII_INTERRUPT_DISABLED);
+
+	/* Schedule the phy change */
+	schedule_work(&priv->tq);
+
+	return IRQ_HANDLED;
+}
+
+/* Scheduled by the phy_interrupt/timer to handle PHY changes */
+static void gfar_phy_change(void *data)
+{
+	struct net_device *dev = (struct net_device *) data;
+	struct gfar_private *priv = netdev_priv(dev);
+	int result = 0;
+
+	/* Delay to give the PHY a chance to change the
+	 * register state */
+	msleep(1);
+
+	/* Update the link, speed, duplex */
+	result = priv->mii_info->phyinfo->read_status(priv->mii_info);
+
+	/* Adjust the known status as long as the link
+	 * isn't still coming up */
+	if((0 == result) || (priv->mii_info->link == 0))
+		adjust_link(dev);
+
+	/* Reenable interrupts, if needed */
+	if (priv->einfo->board_flags & FSL_GIANFAR_BRD_HAS_PHY_INTR)
+		mii_configure_phy_interrupt(priv->mii_info,
+				MII_INTERRUPT_ENABLED);
+}
+
+/* Called every so often on systems that don't interrupt
+ * the core for PHY changes */
+static void gfar_phy_timer(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *) data;
+	struct gfar_private *priv = netdev_priv(dev);
+
+	schedule_work(&priv->tq);
+
+	mod_timer(&priv->phy_info_timer, jiffies +
+			GFAR_PHY_CHANGE_TIME * HZ);
+}
+
+/* Keep trying aneg for some time
+ * If, after GFAR_AN_TIMEOUT seconds, it has not
+ * finished, we switch to forced.
+ * Either way, once the process has completed, we either
+ * request the interrupt, or switch the timer over to 
+ * using gfar_phy_timer to check status */
+static void gfar_phy_startup_timer(unsigned long data)
+{
+	int result;
+	static int secondary = GFAR_AN_TIMEOUT;
+	struct gfar_mii_info *mii_info = (struct gfar_mii_info *)data;
+	struct gfar_private *priv = netdev_priv(mii_info->dev);
+
+	/* Configure the Auto-negotiation */
+	result = mii_info->phyinfo->config_aneg(mii_info);
+
+	/* If autonegotiation failed to start, and
+	 * we haven't timed out, reset the timer, and return */
+	if (result && secondary--) {
+		mod_timer(&priv->phy_info_timer, jiffies + HZ);
+		return;
+	} else if (result) {
+		/* Couldn't start autonegotiation.
+		 * Try switching to forced */
+		mii_info->autoneg = 0;
+		result = mii_info->phyinfo->config_aneg(mii_info);
+
+		/* Forcing failed!  Give up */
+		if(result) {
+			printk(KERN_ERR "%s: Forcing failed!\n",
+					mii_info->dev->name);
+			return;
+		}
+	}
+
+	/* Kill the timer so it can be restarted */
+	del_timer_sync(&priv->phy_info_timer);
+
+	/* Grab the PHY interrupt, if necessary/possible */
+	if (priv->einfo->board_flags & FSL_GIANFAR_BRD_HAS_PHY_INTR) {
+		if (request_irq(priv->einfo->interruptPHY, 
+					phy_interrupt,
+					SA_SHIRQ, 
+					"phy_interrupt", 
+					mii_info->dev) < 0) {
+			printk(KERN_ERR "%s: Can't get IRQ %d (PHY)\n",
+					mii_info->dev->name,
+					priv->einfo->interruptPHY);
+		} else {
+			mii_configure_phy_interrupt(priv->mii_info, 
+					MII_INTERRUPT_ENABLED);
+			return;
+		}
+	}
+
+	/* Start the timer again, this time in order to
+	 * handle a change in status */
+	init_timer(&priv->phy_info_timer);
+	priv->phy_info_timer.function = &gfar_phy_timer;
+	priv->phy_info_timer.data = (unsigned long) mii_info->dev;
+	mod_timer(&priv->phy_info_timer, jiffies +
+			GFAR_PHY_CHANGE_TIME * HZ);
+}
+
+/* Called every time the controller might need to be made
+ * aware of new link state.  The PHY code conveys this
+ * information through variables in the priv structure, and this
+ * function converts those variables into the appropriate
+ * register values, and can bring down the device if needed.
+ */
+static void adjust_link(struct net_device *dev)
+{
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar *regs = priv->regs;
+	u32 tempval;
+	struct gfar_mii_info *mii_info = priv->mii_info;
+
+	if (mii_info->link) {
+		/* Now we make sure that we can be in full duplex mode.
+		 * If not, we operate in half-duplex mode. */
+		if (mii_info->duplex != priv->oldduplex) {
+			if (!(mii_info->duplex)) {
+				tempval = gfar_read(&regs->maccfg2);
+				tempval &= ~(MACCFG2_FULL_DUPLEX);
+				gfar_write(&regs->maccfg2, tempval);
+
+				printk(KERN_INFO "%s: Half Duplex\n",
+				       dev->name);
+			} else {
+				tempval = gfar_read(&regs->maccfg2);
+				tempval |= MACCFG2_FULL_DUPLEX;
+				gfar_write(&regs->maccfg2, tempval);
+
+				printk(KERN_INFO "%s: Full Duplex\n",
+				       dev->name);
+			}
+
+			priv->oldduplex = mii_info->duplex;
+		}
+
+		if (mii_info->speed != priv->oldspeed) {
+			switch (mii_info->speed) {
+			case 1000:
+				tempval = gfar_read(&regs->maccfg2);
+				tempval =
+				    ((tempval & ~(MACCFG2_IF)) | MACCFG2_GMII);
+				gfar_write(&regs->maccfg2, tempval);
+				break;
+			case 100:
+			case 10:
+				tempval = gfar_read(&regs->maccfg2);
+				tempval =
+				    ((tempval & ~(MACCFG2_IF)) | MACCFG2_MII);
+				gfar_write(&regs->maccfg2, tempval);
+				break;
+			default:
+				printk(KERN_WARNING
+				       "%s: Ack!  Speed (%d) is not 10/100/1000!\n",
+				       dev->name, mii_info->speed);
+				break;
+			}
+
+			printk(KERN_INFO "%s: Speed %dBT\n", dev->name,
+			       mii_info->speed);
+
+			priv->oldspeed = mii_info->speed;
+		}
+
+		if (!priv->oldlink) {
+			printk(KERN_INFO "%s: Link is up\n", dev->name);
+			priv->oldlink = 1;
+			netif_carrier_on(dev);
+			netif_schedule(dev);
+		}
+	} else {
+		if (priv->oldlink) {
+			printk(KERN_INFO "%s: Link is down\n", dev->name);
+			priv->oldlink = 0;
+			priv->oldspeed = 0;
+			priv->oldduplex = -1;
+			netif_carrier_off(dev);
+		}
+	}
+}
+
+
+/* Update the hash table based on the current list of multicast
+ * addresses we subscribe to.  Also, change the promiscuity of
+ * the device based on the flags (this function is called
+ * whenever dev->flags is changed */
+static void gfar_set_multi(struct net_device *dev)
+{
+	struct dev_mc_list *mc_ptr;
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar *regs = priv->regs;
+	u32 tempval;
+
+	if(dev->flags & IFF_PROMISC) {
+		printk(KERN_INFO "%s: Entering promiscuous mode.\n",
+				dev->name);
+		/* Set RCTRL to PROM */
+		tempval = gfar_read(&regs->rctrl);
+		tempval |= RCTRL_PROM;
+		gfar_write(&regs->rctrl, tempval);
+	} else {
+		/* Set RCTRL to not PROM */
+		tempval = gfar_read(&regs->rctrl);
+		tempval &= ~(RCTRL_PROM);
+		gfar_write(&regs->rctrl, tempval);
+	}
+	
+	if(dev->flags & IFF_ALLMULTI) {
+		/* Set the hash to rx all multicast frames */
+		gfar_write(&regs->gaddr0, 0xffffffff);
+		gfar_write(&regs->gaddr1, 0xffffffff);
+		gfar_write(&regs->gaddr2, 0xffffffff);
+		gfar_write(&regs->gaddr3, 0xffffffff);
+		gfar_write(&regs->gaddr4, 0xffffffff);
+		gfar_write(&regs->gaddr5, 0xffffffff);
+		gfar_write(&regs->gaddr6, 0xffffffff);
+		gfar_write(&regs->gaddr7, 0xffffffff);
+	} else {
+		/* zero out the hash */
+		gfar_write(&regs->gaddr0, 0x0);
+		gfar_write(&regs->gaddr1, 0x0);
+		gfar_write(&regs->gaddr2, 0x0);
+		gfar_write(&regs->gaddr3, 0x0);
+		gfar_write(&regs->gaddr4, 0x0);
+		gfar_write(&regs->gaddr5, 0x0);
+		gfar_write(&regs->gaddr6, 0x0);
+		gfar_write(&regs->gaddr7, 0x0);
+
+		if(dev->mc_count == 0)
+			return;
+
+		/* Parse the list, and set the appropriate bits */
+		for(mc_ptr = dev->mc_list; mc_ptr; mc_ptr = mc_ptr->next) {
+			gfar_set_hash_for_addr(dev, mc_ptr->dmi_addr);
+		}
+	}
+
+	return;
+}
+
+/* Set the appropriate hash bit for the given addr */
+/* The algorithm works like so:
+ * 1) Take the Destination Address (ie the multicast address), and
+ * do a CRC on it (little endian), and reverse the bits of the
+ * result.
+ * 2) Use the 8 most significant bits as a hash into a 256-entry
+ * table.  The table is controlled through 8 32-bit registers:
+ * gaddr0-7.  gaddr0's MSB is entry 0, and gaddr7's LSB is
+ * gaddr7.  This means that the 3 most significant bits in the
+ * hash index which gaddr register to use, and the 5 other bits
+ * indicate which bit (assuming an IBM numbering scheme, which
+ * for PowerPC (tm) is usually the case) in the register holds
+ * the entry. */
+static void gfar_set_hash_for_addr(struct net_device *dev, u8 *addr)
+{
+	u32 tempval;
+	struct gfar_private *priv = netdev_priv(dev);
+	struct gfar *regs = priv->regs;
+	u32 *hash = &regs->gaddr0;
+	u32 result = ether_crc(MAC_ADDR_LEN, addr);
+	u8 whichreg = ((result >> 29) & 0x7);
+	u8 whichbit = ((result >> 24) & 0x1f);
+	u32 value = (1 << (31-whichbit));
+
+	tempval = gfar_read(&hash[whichreg]);
+	tempval |= value;
+	gfar_write(&hash[whichreg], tempval);
+
+	return;
+}
+
+/* GFAR error interrupt handler */
+static irqreturn_t gfar_error(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct gfar_private *priv = netdev_priv(dev);
+
+	/* Save ievent for future reference */
+	u32 events = gfar_read(&priv->regs->ievent);
+
+	/* Clear IEVENT */
+	gfar_write(&priv->regs->ievent, IEVENT_ERR_MASK);
+
+	/* Hmm... */
+#if defined (BRIEF_GFAR_ERRORS) || defined (VERBOSE_GFAR_ERRORS)
+	printk(KERN_DEBUG "%s: error interrupt (ievent=0x%08x imask=0x%08x)\n",
+	       dev->name, events, gfar_read(&priv->regs->imask));
+#endif
+
+	/* Update the error counters */
+	if (events & IEVENT_TXE) {
+		priv->stats.tx_errors++;
+
+		if (events & IEVENT_LC)
+			priv->stats.tx_window_errors++;
+		if (events & IEVENT_CRL)
+			priv->stats.tx_aborted_errors++;
+		if (events & IEVENT_XFUN) {
+#ifdef VERBOSE_GFAR_ERRORS
+			printk(KERN_DEBUG "%s: underrun.  packet dropped.\n",
+			       dev->name);
+#endif
+			priv->stats.tx_dropped++;
+			priv->extra_stats.tx_underrun++;
+
+			/* Reactivate the Tx Queues */
+			gfar_write(&priv->regs->tstat, TSTAT_CLEAR_THALT);
+		}
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: Transmit Error\n", dev->name);
+#endif
+	}
+	if (events & IEVENT_BSY) {
+		priv->stats.rx_errors++;
+		priv->extra_stats.rx_bsy++;
+
+		gfar_receive(irq, dev_id, regs);
+
+#ifndef CONFIG_GFAR_NAPI
+		/* Clear the halt bit in RSTAT */
+		gfar_write(&priv->regs->rstat, RSTAT_CLEAR_RHALT);
+#endif
+
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: busy error (rhalt: %x)\n", dev->name,
+		       gfar_read(&priv->regs->rstat));
+#endif
+	}
+	if (events & IEVENT_BABR) {
+		priv->stats.rx_errors++;
+		priv->extra_stats.rx_babr++;
+
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: babbling error\n", dev->name);
+#endif
+	}
+	if (events & IEVENT_EBERR) {
+		priv->extra_stats.eberr++;
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: EBERR\n", dev->name);
+#endif
+	}
+	if (events & IEVENT_RXC)
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: control frame\n", dev->name);
+#endif
+
+	if (events & IEVENT_BABT) {
+		priv->extra_stats.tx_babt++;
+#ifdef VERBOSE_GFAR_ERRORS
+		printk(KERN_DEBUG "%s: babt error\n", dev->name);
+#endif
+	}
+	return IRQ_HANDLED;
+}
+
+/* Structure for a device driver */
+static struct device_driver gfar_driver = {
+	.name = "fsl-gianfar",
+	.bus = &platform_bus_type,
+	.probe = gfar_probe,
+	.remove = gfar_remove,
+};
+
+static int __init gfar_init(void)
+{
+	return driver_register(&gfar_driver);
+}
+
+static void __exit gfar_exit(void)
+{
+	driver_unregister(&gfar_driver);
+}
+
+module_init(gfar_init);
+module_exit(gfar_exit);
+