/*

   * e100net.c: A network driver for the ETRAX 100LX network controller.
   *
   * Copyright (c) 1998-2002 Axis Communications AB.
   *
   * The outline of this driver comes from skeleton.c.
   *

   */

  
  #include <linux/module.h>
  
  #include <linux/kernel.h>

  #include <linux/delay.h>
  #include <linux/types.h>
  #include <linux/fcntl.h>
  #include <linux/interrupt.h>
  #include <linux/ptrace.h>
  #include <linux/ioport.h>
  #include <linux/in.h>
  #include <linux/slab.h>
  #include <linux/string.h>
  #include <linux/spinlock.h>
  #include <linux/errno.h>
  #include <linux/init.h>

  #include <linux/bitops.h>

  
  #include <linux/if.h>
  #include <linux/mii.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/ethtool.h>

  #include <arch/svinto.h>/* DMA and register descriptions */

  #include <asm/io.h>         /* CRIS_LED_* I/O functions */

  #include <asm/irq.h>
  #include <asm/dma.h>
  #include <asm/system.h>

  #include <asm/ethernet.h>
  #include <asm/cache.h>

  #include <arch/io_interface_mux.h>

  
  //#define ETHDEBUG
  #define D(x)
  
  /*
   * The name of the card. Is used for messages and in the requests for
   * io regions, irqs and dma channels
   */
  
  static const char* cardname = "ETRAX 100LX built-in ethernet controller";
  
  /* A default ethernet address. Highlevel SW will set the real one later */
  
  static struct sockaddr default_mac = {
  	0,
  	{ 0x00, 0x40, 0x8C, 0xCD, 0x00, 0x00 }
  };
  
  /* Information that need to be kept for each board. */
  struct net_local {
  	struct net_device_stats stats;
  	struct mii_if_info mii_if;
  
  	/* Tx control lock.  This protects the transmit buffer ring
  	 * state along with the "tx full" state of the driver.  This
  	 * means all netif_queue flow control actions are protected
  	 * by this lock as well.
  	 */
  	spinlock_t lock;

  
  	spinlock_t led_lock; /* Protect LED state */
  	spinlock_t transceiver_lock; /* Protect transceiver state. */

  };
  
  typedef struct etrax_eth_descr
  {
  	etrax_dma_descr descr;
  	struct sk_buff* skb;
  } etrax_eth_descr;
  
  /* Some transceivers requires special handling */
  struct transceiver_ops
  {
  	unsigned int oui;
  	void (*check_speed)(struct net_device* dev);
  	void (*check_duplex)(struct net_device* dev);
  };

  /* Duplex settings */
  enum duplex
  {
  	half,
  	full,
  	autoneg
  };
  
  /* Dma descriptors etc. */

  #define MAX_MEDIA_DATA_SIZE 1522

  
  #define MIN_PACKET_LEN      46
  #define ETHER_HEAD_LEN      14
  
  /*
  ** MDIO constants.
  */
  #define MDIO_START                          0x1
  #define MDIO_READ                           0x2
  #define MDIO_WRITE                          0x1
  #define MDIO_PREAMBLE              0xfffffffful
  
  /* Broadcom specific */
  #define MDIO_AUX_CTRL_STATUS_REG           0x18
  #define MDIO_BC_FULL_DUPLEX_IND             0x1
  #define MDIO_BC_SPEED                       0x2
  
  /* TDK specific */
  #define MDIO_TDK_DIAGNOSTIC_REG              18
  #define MDIO_TDK_DIAGNOSTIC_RATE          0x400
  #define MDIO_TDK_DIAGNOSTIC_DPLX          0x800
  
  /*Intel LXT972A specific*/
  #define MDIO_INT_STATUS_REG_2			0x0011

  #define MDIO_INT_FULL_DUPLEX_IND       (1 << 9)
  #define MDIO_INT_SPEED                (1 << 14)

  
  /* Network flash constants */
  #define NET_FLASH_TIME                  (HZ/50) /* 20 ms */
  #define NET_FLASH_PAUSE                (HZ/100) /* 10 ms */
  #define NET_LINK_UP_CHECK_INTERVAL       (2*HZ) /* 2 s   */
  #define NET_DUPLEX_CHECK_INTERVAL        (2*HZ) /* 2 s   */
  
  #define NO_NETWORK_ACTIVITY 0
  #define NETWORK_ACTIVITY    1

  #define NBR_OF_RX_DESC     32
  #define NBR_OF_TX_DESC     16

  
  /* Large packets are sent directly to upper layers while small packets are */
  /* copied (to reduce memory waste). The following constant decides the breakpoint */
  #define RX_COPYBREAK 256
  
  /* Due to a chip bug we need to flush the cache when descriptors are returned */
  /* to the DMA. To decrease performance impact we return descriptors in chunks. */
  /* The following constant determines the number of descriptors to return. */
  #define RX_QUEUE_THRESHOLD  NBR_OF_RX_DESC/2
  
  #define GET_BIT(bit,val)   (((val) >> (bit)) & 0x01)
  
  /* Define some macros to access ETRAX 100 registers */
  #define SETF(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
  					  IO_FIELD_(reg##_, field##_, val)
  #define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
  					  IO_STATE_(reg##_, field##_, _##val)
  
  static etrax_eth_descr *myNextRxDesc;  /* Points to the next descriptor to
                                            to be processed */
  static etrax_eth_descr *myLastRxDesc;  /* The last processed descriptor */

  
  static etrax_eth_descr RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned(32)));
  
  static etrax_eth_descr* myFirstTxDesc; /* First packet not yet sent */
  static etrax_eth_descr* myLastTxDesc;  /* End of send queue */
  static etrax_eth_descr* myNextTxDesc;  /* Next descriptor to use */
  static etrax_eth_descr TxDescList[NBR_OF_TX_DESC] __attribute__ ((aligned(32)));
  
  static unsigned int network_rec_config_shadow = 0;

  
  static unsigned int network_tr_ctrl_shadow = 0;
  
  /* Network speed indication. */

  static DEFINE_TIMER(speed_timer, NULL, 0, 0);
  static DEFINE_TIMER(clear_led_timer, NULL, 0, 0);

  static int current_speed; /* Speed read from transceiver */
  static int current_speed_selection; /* Speed selected by user */
  static unsigned long led_next_time;
  static int led_active;
  static int rx_queue_len;
  
  /* Duplex */

  static DEFINE_TIMER(duplex_timer, NULL, 0, 0);

  static int full_duplex;
  static enum duplex current_duplex;
  
  /* Index to functions, as function prototypes. */
  
  static int etrax_ethernet_init(void);
  
  static int e100_open(struct net_device *dev);
  static int e100_set_mac_address(struct net_device *dev, void *addr);
  static int e100_send_packet(struct sk_buff *skb, struct net_device *dev);

  static irqreturn_t e100rxtx_interrupt(int irq, void *dev_id);
  static irqreturn_t e100nw_interrupt(int irq, void *dev_id);

  static void e100_rx(struct net_device *dev);
  static int e100_close(struct net_device *dev);
  static int e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);

  static int e100_set_config(struct net_device* dev, struct ifmap* map);
  static void e100_tx_timeout(struct net_device *dev);
  static struct net_device_stats *e100_get_stats(struct net_device *dev);
  static void set_multicast_list(struct net_device *dev);

  static void e100_hardware_send_packet(struct net_local* np, char *buf, int length);

  static void update_rx_stats(struct net_device_stats *);
  static void update_tx_stats(struct net_device_stats *);
  static int e100_probe_transceiver(struct net_device* dev);
  
  static void e100_check_speed(unsigned long priv);
  static void e100_set_speed(struct net_device* dev, unsigned long speed);
  static void e100_check_duplex(unsigned long priv);
  static void e100_set_duplex(struct net_device* dev, enum duplex);
  static void e100_negotiate(struct net_device* dev);
  
  static int e100_get_mdio_reg(struct net_device *dev, int phy_id, int location);
  static void e100_set_mdio_reg(struct net_device *dev, int phy_id, int location, int value);
  
  static void e100_send_mdio_cmd(unsigned short cmd, int write_cmd);
  static void e100_send_mdio_bit(unsigned char bit);
  static unsigned char e100_receive_mdio_bit(void);
  static void e100_reset_transceiver(struct net_device* net);
  
  static void e100_clear_network_leds(unsigned long dummy);
  static void e100_set_network_leds(int active);

  static const struct ethtool_ops e100_ethtool_ops;

  #if defined(CONFIG_ETRAX_NO_PHY)
  static void dummy_check_speed(struct net_device* dev);
  static void dummy_check_duplex(struct net_device* dev);
  #else

  static void broadcom_check_speed(struct net_device* dev);
  static void broadcom_check_duplex(struct net_device* dev);
  static void tdk_check_speed(struct net_device* dev);
  static void tdk_check_duplex(struct net_device* dev);
  static void intel_check_speed(struct net_device* dev);
  static void intel_check_duplex(struct net_device* dev);
  static void generic_check_speed(struct net_device* dev);
  static void generic_check_duplex(struct net_device* dev);

  #endif
  #ifdef CONFIG_NET_POLL_CONTROLLER
  static void e100_netpoll(struct net_device* dev);
  #endif
  
  static int autoneg_normal = 1;

  
  struct transceiver_ops transceivers[] =
  {

  #if defined(CONFIG_ETRAX_NO_PHY)
  	{0x0000, dummy_check_speed, dummy_check_duplex}        /* Dummy */
  #else

  	{0x1018, broadcom_check_speed, broadcom_check_duplex},  /* Broadcom */
  	{0xC039, tdk_check_speed, tdk_check_duplex},            /* TDK 2120 */
  	{0x039C, tdk_check_speed, tdk_check_duplex},            /* TDK 2120C */
          {0x04de, intel_check_speed, intel_check_duplex},     	/* Intel LXT972A*/
  	{0x0000, generic_check_speed, generic_check_duplex}     /* Generic, must be last */

  #endif

  };

  struct transceiver_ops* transceiver = &transceivers[0];

  static const struct net_device_ops e100_netdev_ops = {
  	.ndo_open		= e100_open,
  	.ndo_stop		= e100_close,
  	.ndo_start_xmit		= e100_send_packet,
  	.ndo_tx_timeout		= e100_tx_timeout,
  	.ndo_get_stats		= e100_get_stats,
  	.ndo_set_multicast_list	= set_multicast_list,
  	.ndo_do_ioctl		= e100_ioctl,
  	.ndo_set_mac_address	= e100_set_mac_address,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_set_config		= e100_set_config,
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_poll_controller	= e100_netpoll,
  #endif
  };

  #define tx_done(dev) (*R_DMA_CH0_CMD == 0)
  
  /*
   * Check for a network adaptor of this type, and return '0' if one exists.
   * If dev->base_addr == 0, probe all likely locations.
   * If dev->base_addr == 1, always return failure.
   * If dev->base_addr == 2, allocate space for the device and return success
   * (detachable devices only).
   */
  
  static int __init
  etrax_ethernet_init(void)
  {
  	struct net_device *dev;
          struct net_local* np;
  	int i, err;
  
  	printk(KERN_INFO

  	       "ETRAX 100LX 10/100MBit ethernet v2.0 (c) 1998-2007 Axis Communications AB
  ");

  	if (cris_request_io_interface(if_eth, cardname)) {
  		printk(KERN_CRIT "etrax_ethernet_init failed to get IO interface
  ");
  		return -EBUSY;
  	}

  	dev = alloc_etherdev(sizeof(struct net_local));

  	if (!dev)
  		return -ENOMEM;

  	np = netdev_priv(dev);
  
  	/* we do our own locking */
  	dev->features |= NETIF_F_LLTX;

  	dev->base_addr = (unsigned int)R_NETWORK_SA_0; /* just to have something to show */
  
  	/* now setup our etrax specific stuff */
  
  	dev->irq = NETWORK_DMA_RX_IRQ_NBR; /* we really use DMATX as well... */
  	dev->dma = NETWORK_RX_DMA_NBR;
  
  	/* fill in our handlers so the network layer can talk to us in the future */

  	dev->ethtool_ops	= &e100_ethtool_ops;

  	dev->netdev_ops		= &e100_netdev_ops;

  
  	spin_lock_init(&np->lock);
  	spin_lock_init(&np->led_lock);
  	spin_lock_init(&np->transceiver_lock);

  
  	/* Initialise the list of Etrax DMA-descriptors */
  
  	/* Initialise receive descriptors */
  
  	for (i = 0; i < NBR_OF_RX_DESC; i++) {

  		/* Allocate two extra cachelines to make sure that buffer used
  		 * by DMA does not share cacheline with any other data (to
  		 * avoid cache bug)

  		 */
  		RxDescList[i].skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);

  		if (!RxDescList[i].skb)
  			return -ENOMEM;

  		RxDescList[i].descr.ctrl   = 0;
  		RxDescList[i].descr.sw_len = MAX_MEDIA_DATA_SIZE;
  		RxDescList[i].descr.next   = virt_to_phys(&RxDescList[i + 1]);
  		RxDescList[i].descr.buf    = L1_CACHE_ALIGN(virt_to_phys(RxDescList[i].skb->data));
  		RxDescList[i].descr.status = 0;
  		RxDescList[i].descr.hw_len = 0;
  		prepare_rx_descriptor(&RxDescList[i].descr);
  	}
  
  	RxDescList[NBR_OF_RX_DESC - 1].descr.ctrl   = d_eol;
  	RxDescList[NBR_OF_RX_DESC - 1].descr.next   = virt_to_phys(&RxDescList[0]);
  	rx_queue_len = 0;
  
  	/* Initialize transmit descriptors */
  	for (i = 0; i < NBR_OF_TX_DESC; i++) {
  		TxDescList[i].descr.ctrl   = 0;
  		TxDescList[i].descr.sw_len = 0;
  		TxDescList[i].descr.next   = virt_to_phys(&TxDescList[i + 1].descr);
  		TxDescList[i].descr.buf    = 0;
  		TxDescList[i].descr.status = 0;
  		TxDescList[i].descr.hw_len = 0;
  		TxDescList[i].skb = 0;
  	}
  
  	TxDescList[NBR_OF_TX_DESC - 1].descr.ctrl   = d_eol;
  	TxDescList[NBR_OF_TX_DESC - 1].descr.next   = virt_to_phys(&TxDescList[0].descr);
  
  	/* Initialise initial pointers */
  
  	myNextRxDesc  = &RxDescList[0];
  	myLastRxDesc  = &RxDescList[NBR_OF_RX_DESC - 1];

  	myFirstTxDesc = &TxDescList[0];
  	myNextTxDesc  = &TxDescList[0];
  	myLastTxDesc  = &TxDescList[NBR_OF_TX_DESC - 1];
  
  	/* Register device */
  	err = register_netdev(dev);
  	if (err) {
  		free_netdev(dev);
  		return err;
  	}
  
  	/* set the default MAC address */
  
  	e100_set_mac_address(dev, &default_mac);
  
  	/* Initialize speed indicator stuff. */
  
  	current_speed = 10;
  	current_speed_selection = 0; /* Auto */
  	speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;

  	speed_timer.data = (unsigned long)dev;

  	speed_timer.function = e100_check_speed;
  
  	clear_led_timer.function = e100_clear_network_leds;

  	clear_led_timer.data = (unsigned long)dev;

  
  	full_duplex = 0;
  	current_duplex = autoneg;
  	duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
          duplex_timer.data = (unsigned long)dev;
  	duplex_timer.function = e100_check_duplex;
  
          /* Initialize mii interface */

  	np->mii_if.phy_id_mask = 0x1f;
  	np->mii_if.reg_num_mask = 0x1f;
  	np->mii_if.dev = dev;
  	np->mii_if.mdio_read = e100_get_mdio_reg;
  	np->mii_if.mdio_write = e100_set_mdio_reg;
  
  	/* Initialize group address registers to make sure that no */
  	/* unwanted addresses are matched */
  	*R_NETWORK_GA_0 = 0x00000000;
  	*R_NETWORK_GA_1 = 0x00000000;

  
  	/* Initialize next time the led can flash */
  	led_next_time = jiffies;

  	return 0;
  }
  
  /* set MAC address of the interface. called from the core after a
   * SIOCSIFADDR ioctl, and from the bootup above.
   */
  
  static int
  e100_set_mac_address(struct net_device *dev, void *p)
  {

  	struct net_local *np = netdev_priv(dev);

  	struct sockaddr *addr = p;

  
  	spin_lock(&np->lock); /* preemption protection */
  
  	/* remember it */
  
  	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
  
  	/* Write it to the hardware.
  	 * Note the way the address is wrapped:
  	 * *R_NETWORK_SA_0 = a0_0 | (a0_1 << 8) | (a0_2 << 16) | (a0_3 << 24);
  	 * *R_NETWORK_SA_1 = a0_4 | (a0_5 << 8);
  	 */
  
  	*R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
  		(dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
  	*R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
  	*R_NETWORK_SA_2 = 0;
  
  	/* show it in the log as well */

  	printk(KERN_INFO "%s: changed MAC to %pM
  ", dev->name, dev->dev_addr);

  
  	spin_unlock(&np->lock);
  
  	return 0;
  }
  
  /*
   * Open/initialize the board. This is called (in the current kernel)
   * sometime after booting when the 'ifconfig' program is run.
   *
   * This routine should set everything up anew at each open, even
   * registers that "should" only need to be set once at boot, so that
   * there is non-reboot way to recover if something goes wrong.
   */
  
  static int
  e100_open(struct net_device *dev)
  {
  	unsigned long flags;
  
  	/* enable the MDIO output pin */
  
  	*R_NETWORK_MGM_CTRL = IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable);
  
  	*R_IRQ_MASK0_CLR =
  		IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
  		IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
  		IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);
  
  	/* clear dma0 and 1 eop and descr irq masks */
  	*R_IRQ_MASK2_CLR =
  		IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
  		IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
  		IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
  		IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);
  
  	/* Reset and wait for the DMA channels */
  
  	RESET_DMA(NETWORK_TX_DMA_NBR);
  	RESET_DMA(NETWORK_RX_DMA_NBR);
  	WAIT_DMA(NETWORK_TX_DMA_NBR);
  	WAIT_DMA(NETWORK_RX_DMA_NBR);
  
  	/* Initialise the etrax network controller */
  
  	/* allocate the irq corresponding to the receiving DMA */
  
  	if (request_irq(NETWORK_DMA_RX_IRQ_NBR, e100rxtx_interrupt,

  			IRQF_SAMPLE_RANDOM, cardname, (void *)dev)) {

  		goto grace_exit0;
  	}
  
  	/* allocate the irq corresponding to the transmitting DMA */
  
  	if (request_irq(NETWORK_DMA_TX_IRQ_NBR, e100rxtx_interrupt, 0,
  			cardname, (void *)dev)) {
  		goto grace_exit1;
  	}
  
  	/* allocate the irq corresponding to the network errors etc */
  
  	if (request_irq(NETWORK_STATUS_IRQ_NBR, e100nw_interrupt, 0,
  			cardname, (void *)dev)) {
  		goto grace_exit2;
  	}

  	/*
  	 * Always allocate the DMA channels after the IRQ,
  	 * and clean up on failure.
  	 */
  
  	if (cris_request_dma(NETWORK_TX_DMA_NBR,
  	                     cardname,
  	                     DMA_VERBOSE_ON_ERROR,
  	                     dma_eth)) {
  		goto grace_exit3;
          }
  
  	if (cris_request_dma(NETWORK_RX_DMA_NBR,
  	                     cardname,
  	                     DMA_VERBOSE_ON_ERROR,
  	                     dma_eth)) {
  		goto grace_exit4;
          }

  	/* give the HW an idea of what MAC address we want */
  
  	*R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
  		(dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
  	*R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
  	*R_NETWORK_SA_2 = 0;
  
  #if 0
  	/* use promiscuous mode for testing */
  	*R_NETWORK_GA_0 = 0xffffffff;
  	*R_NETWORK_GA_1 = 0xffffffff;
  
  	*R_NETWORK_REC_CONFIG = 0xd; /* broadcast rec, individ. rec, ma0 enabled */
  #else

  	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, max_size, size1522);

  	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, broadcast, receive);
  	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, ma0, enable);
  	SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
  	*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
  #endif
  
  	*R_NETWORK_GEN_CONFIG =
  		IO_STATE(R_NETWORK_GEN_CONFIG, phy,    mii_clk) |
  		IO_STATE(R_NETWORK_GEN_CONFIG, enable, on);
  
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, delay, none);
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cancel, dont);
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cd, enable);
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, retry, enable);
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, pad, enable);
  	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, crc, enable);
  	*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;

  	local_irq_save(flags);

  
  	/* enable the irq's for ethernet DMA */
  
  	*R_IRQ_MASK2_SET =
  		IO_STATE(R_IRQ_MASK2_SET, dma0_eop, set) |
  		IO_STATE(R_IRQ_MASK2_SET, dma1_eop, set);
  
  	*R_IRQ_MASK0_SET =
  		IO_STATE(R_IRQ_MASK0_SET, overrun,       set) |
  		IO_STATE(R_IRQ_MASK0_SET, underrun,      set) |
  		IO_STATE(R_IRQ_MASK0_SET, excessive_col, set);
  
  	/* make sure the irqs are cleared */
  
  	*R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);
  	*R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);
  
  	/* make sure the rec and transmit error counters are cleared */
  
  	(void)*R_REC_COUNTERS;  /* dummy read */
  	(void)*R_TR_COUNTERS;   /* dummy read */
  
  	/* start the receiving DMA channel so we can receive packets from now on */
  
  	*R_DMA_CH1_FIRST = virt_to_phys(myNextRxDesc);
  	*R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, start);
  
  	/* Set up transmit DMA channel so it can be restarted later */
  
  	*R_DMA_CH0_FIRST = 0;
  	*R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);

  	netif_start_queue(dev);

  	local_irq_restore(flags);

  
  	/* Probe for transceiver */
  	if (e100_probe_transceiver(dev))

  		goto grace_exit5;

  
  	/* Start duplex/speed timers */
  	add_timer(&speed_timer);
  	add_timer(&duplex_timer);
  
  	/* We are now ready to accept transmit requeusts from
  	 * the queueing layer of the networking.
  	 */

  	netif_carrier_on(dev);

  
  	return 0;

  grace_exit5:
  	cris_free_dma(NETWORK_RX_DMA_NBR, cardname);
  grace_exit4:
  	cris_free_dma(NETWORK_TX_DMA_NBR, cardname);

  grace_exit3:
  	free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);
  grace_exit2:
  	free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
  grace_exit1:
  	free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
  grace_exit0:
  	return -EAGAIN;
  }

  #if defined(CONFIG_ETRAX_NO_PHY)
  static void
  dummy_check_speed(struct net_device* dev)
  {
  	current_speed = 100;
  }
  #else

  static void
  generic_check_speed(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);

  	if ((data & ADVERTISE_100FULL) ||
  	    (data & ADVERTISE_100HALF))
  		current_speed = 100;
  	else
  		current_speed = 10;
  }
  
  static void
  tdk_check_speed(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  				 MDIO_TDK_DIAGNOSTIC_REG);

  	current_speed = (data & MDIO_TDK_DIAGNOSTIC_RATE ? 100 : 10);
  }
  
  static void
  broadcom_check_speed(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  				 MDIO_AUX_CTRL_STATUS_REG);

  	current_speed = (data & MDIO_BC_SPEED ? 100 : 10);
  }
  
  static void
  intel_check_speed(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  				 MDIO_INT_STATUS_REG_2);

  	current_speed = (data & MDIO_INT_SPEED ? 100 : 10);
  }

  #endif

  static void
  e100_check_speed(unsigned long priv)
  {
  	struct net_device* dev = (struct net_device*)priv;

  	struct net_local *np = netdev_priv(dev);

  	static int led_initiated = 0;
  	unsigned long data;
  	int old_speed = current_speed;

  	spin_lock(&np->transceiver_lock);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMSR);

  	if (!(data & BMSR_LSTATUS)) {
  		current_speed = 0;
  	} else {
  		transceiver->check_speed(dev);
  	}

  	spin_lock(&np->led_lock);

  	if ((old_speed != current_speed) || !led_initiated) {
  		led_initiated = 1;
  		e100_set_network_leds(NO_NETWORK_ACTIVITY);

  		if (current_speed)
  			netif_carrier_on(dev);
  		else
  			netif_carrier_off(dev);

  	}

  	spin_unlock(&np->led_lock);

  
  	/* Reinitialize the timer. */
  	speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
  	add_timer(&speed_timer);

  
  	spin_unlock(&np->transceiver_lock);

  }
  
  static void
  e100_negotiate(struct net_device* dev)
  {

  	struct net_local *np = netdev_priv(dev);
  	unsigned short data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  						MII_ADVERTISE);

  
  	/* Discard old speed and duplex settings */
  	data &= ~(ADVERTISE_100HALF | ADVERTISE_100FULL |
  	          ADVERTISE_10HALF | ADVERTISE_10FULL);
  
  	switch (current_speed_selection) {

  		case 10:

  			if (current_duplex == full)
  				data |= ADVERTISE_10FULL;
  			else if (current_duplex == half)
  				data |= ADVERTISE_10HALF;
  			else
  				data |= ADVERTISE_10HALF | ADVERTISE_10FULL;
  			break;

  		case 100:

  			 if (current_duplex == full)
  				data |= ADVERTISE_100FULL;
  			else if (current_duplex == half)
  				data |= ADVERTISE_100HALF;
  			else
  				data |= ADVERTISE_100HALF | ADVERTISE_100FULL;
  			break;

  		case 0: /* Auto */

  			 if (current_duplex == full)
  				data |= ADVERTISE_100FULL | ADVERTISE_10FULL;
  			else if (current_duplex == half)
  				data |= ADVERTISE_100HALF | ADVERTISE_10HALF;
  			else
  				data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
  				  ADVERTISE_100HALF | ADVERTISE_100FULL;
  			break;

  		default: /* assume autoneg speed and duplex */

  			data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
  				  ADVERTISE_100HALF | ADVERTISE_100FULL;

  			break;

  	}

  	e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE, data);

  
  	/* Renegotiate with link partner */

  	if (autoneg_normal) {
  	  data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR);

  	data |= BMCR_ANENABLE | BMCR_ANRESTART;

  	}
  	e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR, data);

  }
  
  static void
  e100_set_speed(struct net_device* dev, unsigned long speed)
  {

  	struct net_local *np = netdev_priv(dev);
  
  	spin_lock(&np->transceiver_lock);

  	if (speed != current_speed_selection) {
  		current_speed_selection = speed;
  		e100_negotiate(dev);
  	}

  	spin_unlock(&np->transceiver_lock);

  }
  
  static void
  e100_check_duplex(unsigned long priv)
  {
  	struct net_device *dev = (struct net_device *)priv;

  	struct net_local *np = netdev_priv(dev);
  	int old_duplex;
  
  	spin_lock(&np->transceiver_lock);
  	old_duplex = full_duplex;

  	transceiver->check_duplex(dev);
  	if (old_duplex != full_duplex) {
  		/* Duplex changed */
  		SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
  		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
  	}
  
  	/* Reinitialize the timer. */
  	duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
  	add_timer(&duplex_timer);
  	np->mii_if.full_duplex = full_duplex;

  	spin_unlock(&np->transceiver_lock);

  }

  #if defined(CONFIG_ETRAX_NO_PHY)
  static void
  dummy_check_duplex(struct net_device* dev)
  {
  	full_duplex = 1;
  }
  #else

  static void
  generic_check_duplex(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);

  	if ((data & ADVERTISE_10FULL) ||
  	    (data & ADVERTISE_100FULL))
  		full_duplex = 1;
  	else
  		full_duplex = 0;
  }
  
  static void
  tdk_check_duplex(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  				 MDIO_TDK_DIAGNOSTIC_REG);

  	full_duplex = (data & MDIO_TDK_DIAGNOSTIC_DPLX) ? 1 : 0;
  }
  
  static void
  broadcom_check_duplex(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  				 MDIO_AUX_CTRL_STATUS_REG);

  	full_duplex = (data & MDIO_BC_FULL_DUPLEX_IND) ? 1 : 0;
  }
  
  static void
  intel_check_duplex(struct net_device* dev)
  {
  	unsigned long data;

  	struct net_local *np = netdev_priv(dev);
  
  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
  				 MDIO_INT_STATUS_REG_2);

  	full_duplex = (data & MDIO_INT_FULL_DUPLEX_IND) ? 1 : 0;
  }

  #endif

  static void
  e100_set_duplex(struct net_device* dev, enum duplex new_duplex)
  {

  	struct net_local *np = netdev_priv(dev);
  
  	spin_lock(&np->transceiver_lock);

  	if (new_duplex != current_duplex) {
  		current_duplex = new_duplex;
  		e100_negotiate(dev);
  	}

  	spin_unlock(&np->transceiver_lock);

  }
  
  static int
  e100_probe_transceiver(struct net_device* dev)
  {

  	int ret = 0;

  #if !defined(CONFIG_ETRAX_NO_PHY)

  	unsigned int phyid_high;
  	unsigned int phyid_low;
  	unsigned int oui;
  	struct transceiver_ops* ops = NULL;

  	struct net_local *np = netdev_priv(dev);
  
  	spin_lock(&np->transceiver_lock);

  
  	/* Probe MDIO physical address */

  	for (np->mii_if.phy_id = 0; np->mii_if.phy_id <= 31;
  	     np->mii_if.phy_id++) {
  		if (e100_get_mdio_reg(dev,
  				      np->mii_if.phy_id, MII_BMSR) != 0xffff)

  			break;
  	}

  	if (np->mii_if.phy_id == 32) {
  		ret = -ENODEV;
  		goto out;
  	}

  
  	/* Get manufacturer */

  	phyid_high = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_PHYSID1);
  	phyid_low = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_PHYSID2);

  	oui = (phyid_high << 6) | (phyid_low >> 10);
  
  	for (ops = &transceivers[0]; ops->oui; ops++) {
  		if (ops->oui == oui)
  			break;
  	}
  	transceiver = ops;

  out:

  	spin_unlock(&np->transceiver_lock);
  #endif

  	return ret;

  }
  
  static int
  e100_get_mdio_reg(struct net_device *dev, int phy_id, int location)
  {
  	unsigned short cmd;    /* Data to be sent on MDIO port */
  	int data;   /* Data read from MDIO */
  	int bitCounter;
  
  	/* Start of frame, OP Code, Physical Address, Register Address */
  	cmd = (MDIO_START << 14) | (MDIO_READ << 12) | (phy_id << 7) |
  		(location << 2);
  
  	e100_send_mdio_cmd(cmd, 0);
  
  	data = 0;
  
  	/* Data... */
  	for (bitCounter=15; bitCounter>=0 ; bitCounter--) {
  		data |= (e100_receive_mdio_bit() << bitCounter);
  	}
  
  	return data;
  }
  
  static void
  e100_set_mdio_reg(struct net_device *dev, int phy_id, int location, int value)
  {
  	int bitCounter;
  	unsigned short cmd;
  
  	cmd = (MDIO_START << 14) | (MDIO_WRITE << 12) | (phy_id << 7) |
  	      (location << 2);
  
  	e100_send_mdio_cmd(cmd, 1);
  
  	/* Data... */
  	for (bitCounter=15; bitCounter>=0 ; bitCounter--) {
  		e100_send_mdio_bit(GET_BIT(bitCounter, value));
  	}
  
  }
  
  static void
  e100_send_mdio_cmd(unsigned short cmd, int write_cmd)
  {
  	int bitCounter;
  	unsigned char data = 0x2;
  
  	/* Preamble */
  	for (bitCounter = 31; bitCounter>= 0; bitCounter--)
  		e100_send_mdio_bit(GET_BIT(bitCounter, MDIO_PREAMBLE));
  
  	for (bitCounter = 15; bitCounter >= 2; bitCounter--)
  		e100_send_mdio_bit(GET_BIT(bitCounter, cmd));
  
  	/* Turnaround */
  	for (bitCounter = 1; bitCounter >= 0 ; bitCounter--)
  		if (write_cmd)
  			e100_send_mdio_bit(GET_BIT(bitCounter, data));
  		else
  			e100_receive_mdio_bit();
  }
  
  static void
  e100_send_mdio_bit(unsigned char bit)
  {
  	*R_NETWORK_MGM_CTRL =
  		IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable) |
  		IO_FIELD(R_NETWORK_MGM_CTRL, mdio, bit);
  	udelay(1);
  	*R_NETWORK_MGM_CTRL =
  		IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable) |
  		IO_MASK(R_NETWORK_MGM_CTRL, mdck) |
  		IO_FIELD(R_NETWORK_MGM_CTRL, mdio, bit);
  	udelay(1);
  }
  
  static unsigned char
  e100_receive_mdio_bit()
  {
  	unsigned char bit;
  	*R_NETWORK_MGM_CTRL = 0;
  	bit = IO_EXTRACT(R_NETWORK_STAT, mdio, *R_NETWORK_STAT);
  	udelay(1);
  	*R_NETWORK_MGM_CTRL = IO_MASK(R_NETWORK_MGM_CTRL, mdck);
  	udelay(1);
  	return bit;
  }
  
  static void
  e100_reset_transceiver(struct net_device* dev)
  {

  	struct net_local *np = netdev_priv(dev);

  	unsigned short cmd;
  	unsigned short data;
  	int bitCounter;

  	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR);

  	cmd = (MDIO_START << 14) | (MDIO_WRITE << 12) | (np->mii_if.phy_id << 7) | (MII_BMCR << 2);

  
  	e100_send_mdio_cmd(cmd, 1);
  
  	data |= 0x8000;
  
  	for (bitCounter = 15; bitCounter >= 0 ; bitCounter--) {
  		e100_send_mdio_bit(GET_BIT(bitCounter, data));
  	}
  }
  
  /* Called by upper layers if they decide it took too long to complete
   * sending a packet - we need to reset and stuff.
   */
  
  static void
  e100_tx_timeout(struct net_device *dev)
  {

  	struct net_local *np = netdev_priv(dev);

  	unsigned long flags;
  
  	spin_lock_irqsave(&np->lock, flags);
  
  	printk(KERN_WARNING "%s: transmit timed out, %s?
  ", dev->name,
  	       tx_done(dev) ? "IRQ problem" : "network cable problem");
  
  	/* remember we got an error */
  
  	np->stats.tx_errors++;
  
  	/* reset the TX DMA in case it has hung on something */
  
  	RESET_DMA(NETWORK_TX_DMA_NBR);
  	WAIT_DMA(NETWORK_TX_DMA_NBR);
  
  	/* Reset the transceiver. */
  
  	e100_reset_transceiver(dev);
  
  	/* and get rid of the packets that never got an interrupt */

  	while (myFirstTxDesc != myNextTxDesc) {

  		dev_kfree_skb(myFirstTxDesc->skb);
  		myFirstTxDesc->skb = 0;
  		myFirstTxDesc = phys_to_virt(myFirstTxDesc->descr.next);
  	}
  
  	/* Set up transmit DMA channel so it can be restarted later */
  	*R_DMA_CH0_FIRST = 0;
  	*R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);
  
  	/* tell the upper layers we're ok again */
  
  	netif_wake_queue(dev);
  	spin_unlock_irqrestore(&np->lock, flags);
  }
  
  
  /* This will only be invoked if the driver is _not_ in XOFF state.
   * What this means is that we need not check it, and that this
   * invariant will hold if we make sure that the netif_*_queue()
   * calls are done at the proper times.
   */
  
  static int
  e100_send_packet(struct sk_buff *skb, struct net_device *dev)
  {

  	struct net_local *np = netdev_priv(dev);

  	unsigned char *buf = skb->data;
  	unsigned long flags;
  
  #ifdef ETHDEBUG
  	printk("send packet len %d
  ", length);
  #endif
  	spin_lock_irqsave(&np->lock, flags);  /* protect from tx_interrupt and ourself */
  
  	myNextTxDesc->skb = skb;
  
  	dev->trans_start = jiffies;

  	e100_hardware_send_packet(np, buf, skb->len);

  
  	myNextTxDesc = phys_to_virt(myNextTxDesc->descr.next);
  
  	/* Stop queue if full */
  	if (myNextTxDesc == myFirstTxDesc) {
  		netif_stop_queue(dev);
  	}
  
  	spin_unlock_irqrestore(&np->lock, flags);
  
  	return 0;
  }
  
  /*
   * The typical workload of the driver:
   *   Handle the network interface interrupts.
   */
  
  static irqreturn_t

  e100rxtx_interrupt(int irq, void *dev_id)

  {
  	struct net_device *dev = (struct net_device *)dev_id;

  	struct net_local *np = netdev_priv(dev);
  	unsigned long irqbits;

  	/*
  	 * Note that both rx and tx interrupts are blocked at this point,
  	 * regardless of which got us here.
  	 */
  
  	irqbits = *R_IRQ_MASK2_RD;

  
  	/* Handle received packets */
  	if (irqbits & IO_STATE(R_IRQ_MASK2_RD, dma1_eop, active)) {
  		/* acknowledge the eop interrupt */
  
  		*R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);
  
  		/* check if one or more complete packets were indeed received */
  
  		while ((*R_DMA_CH1_FIRST != virt_to_phys(myNextRxDesc)) &&
  		       (myNextRxDesc != myLastRxDesc)) {
  			/* Take out the buffer and give it to the OS, then
  			 * allocate a new buffer to put a packet in.
  			 */
  			e100_rx(dev);

  			np->stats.rx_packets++;

  			/* restart/continue on the channel, for safety */
  			*R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, restart);
  			/* clear dma channel 1 eop/descr irq bits */
  			*R_DMA_CH1_CLR_INTR =
  				IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do) |
  				IO_STATE(R_DMA_CH1_CLR_INTR, clr_descr, do);
  
  			/* now, we might have gotten another packet
  			   so we have to loop back and check if so */
  		}
  	}
  
  	/* Report any packets that have been sent */

  	while (virt_to_phys(myFirstTxDesc) != *R_DMA_CH0_FIRST &&
  	       (netif_queue_stopped(dev) || myFirstTxDesc != myNextTxDesc)) {

  		np->stats.tx_bytes += myFirstTxDesc->skb->len;
  		np->stats.tx_packets++;
  
  		/* dma is ready with the transmission of the data in tx_skb, so now
  		   we can release the skb memory */
  		dev_kfree_skb_irq(myFirstTxDesc->skb);
  		myFirstTxDesc->skb = 0;
  		myFirstTxDesc = phys_to_virt(myFirstTxDesc->descr.next);

                  /* Wake up queue. */
  		netif_wake_queue(dev);

  	}
  
  	if (irqbits & IO_STATE(R_IRQ_MASK2_RD, dma0_eop, active)) {

  		/* acknowledge the eop interrupt. */

  		*R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);

  	}

  	return IRQ_HANDLED;
  }
  
  static irqreturn_t

  e100nw_interrupt(int irq, void *dev_id)

  {
  	struct net_device *dev = (struct net_device *)dev_id;

  	struct net_local *np = netdev_priv(dev);

  	unsigned long irqbits = *R_IRQ_MASK0_RD;
  
  	/* check for underrun irq */
  	if (irqbits & IO_STATE(R_IRQ_MASK0_RD, underrun, active)) {
  		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
  		*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;
  		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, nop);
  		np->stats.tx_errors++;
  		D(printk("ethernet receiver underrun!
  "));
  	}
  
  	/* check for overrun irq */
  	if (irqbits & IO_STATE(R_IRQ_MASK0_RD, overrun, active)) {
  		update_rx_stats(&np->stats); /* this will ack the irq */
  		D(printk("ethernet receiver overrun!
  "));
  	}
  	/* check for excessive collision irq */
  	if (irqbits & IO_STATE(R_IRQ_MASK0_RD, excessive_col, active)) {
  		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
  		*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;
  		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, nop);

  		np->stats.tx_errors++;
  		D(printk("ethernet excessive collisions!
  "));
  	}
  	return IRQ_HANDLED;
  }
  
  /* We have a good packet(s), get it/them out of the buffers. */
  static void
  e100_rx(struct net_device *dev)
  {
  	struct sk_buff *skb;
  	int length = 0;

  	struct net_local *np = netdev_priv(dev);

  	unsigned char *skb_data_ptr;
  #ifdef ETHDEBUG
  	int i;
  #endif

  	etrax_eth_descr *prevRxDesc;  /* The descriptor right before myNextRxDesc */
  	spin_lock(&np->led_lock);

  	if (!led_active && time_after(jiffies, led_next_time)) {
  		/* light the network leds depending on the current speed. */
  		e100_set_network_leds(NETWORK_ACTIVITY);
  
  		/* Set the earliest time we may clear the LED */
  		led_next_time = jiffies + NET_FLASH_TIME;
  		led_active = 1;
  		mod_timer(&clear_led_timer, jiffies + HZ/10);
  	}

  	spin_unlock(&np->led_lock);

  
  	length = myNextRxDesc->descr.hw_len - 4;

  	np->stats.rx_bytes += length;

  
  #ifdef ETHDEBUG
  	printk("Got a packet of length %d:
  ", length);
  	/* dump the first bytes in the packet */
  	skb_data_ptr = (unsigned char *)phys_to_virt(myNextRxDesc->descr.buf);
  	for (i = 0; i < 8; i++) {
  		printk("%d: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x
  ", i * 8,
  		       skb_data_ptr[0],skb_data_ptr[1],skb_data_ptr[2],skb_data_ptr[3],
  		       skb_data_ptr[4],skb_data_ptr[5],skb_data_ptr[6],skb_data_ptr[7]);
  		skb_data_ptr += 8;
  	}
  #endif
  
  	if (length < RX_COPYBREAK) {
  		/* Small packet, copy data */
  		skb = dev_alloc_skb(length - ETHER_HEAD_LEN);
  		if (!skb) {
  			np->stats.rx_errors++;
  			printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.
  ", dev->name);

  			goto update_nextrxdesc;

  		}
  
  		skb_put(skb, length - ETHER_HEAD_LEN);        /* allocate room for the packet body */
  		skb_data_ptr = skb_push(skb, ETHER_HEAD_LEN); /* allocate room for the header */
  
  #ifdef ETHDEBUG
  		printk("head = 0x%x, data = 0x%x, tail = 0x%x, end = 0x%x
  ",

  		       skb->head, skb->data, skb_tail_pointer(skb),
  		       skb_end_pointer(skb));

  		printk("copying packet to 0x%x.
  ", skb_data_ptr);
  #endif
  
  		memcpy(skb_data_ptr, phys_to_virt(myNextRxDesc->descr.buf), length);
  	}
  	else {
  		/* Large packet, send directly to upper layers and allocate new
  		 * memory (aligned to cache line boundary to avoid bug).

  		 * Before sending the skb to upper layers we must make sure
  		 * that skb->data points to the aligned start of the packet.

  		 */
  		int align;
  		struct sk_buff *new_skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
  		if (!new_skb) {
  			np->stats.rx_errors++;
  			printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.
  ", dev->name);

  			goto update_nextrxdesc;

  		}
  		skb = myNextRxDesc->skb;
  		align = (int)phys_to_virt(myNextRxDesc->descr.buf) - (int)skb->data;
  		skb_put(skb, length + align);
  		skb_pull(skb, align); /* Remove alignment bytes */
  		myNextRxDesc->skb = new_skb;
  		myNextRxDesc->descr.buf = L1_CACHE_ALIGN(virt_to_phys(myNextRxDesc->skb->data));
  	}

  	skb->protocol = eth_type_trans(skb, dev);
  
  	/* Send the packet to the upper layers */
  	netif_rx(skb);

    update_nextrxdesc:

  	/* Prepare for next packet */
  	myNextRxDesc->descr.status = 0;

  	prevRxDesc = myNextRxDesc;

  	myNextRxDesc = phys_to_virt(myNextRxDesc->descr.next);
  
  	rx_queue_len++;
  
  	/* Check if descriptors should be returned */
  	if (rx_queue_len == RX_QUEUE_THRESHOLD) {
  		flush_etrax_cache();

  		prevRxDesc->descr.ctrl |= d_eol;

  		myLastRxDesc->descr.ctrl &= ~d_eol;

  		myLastRxDesc = prevRxDesc;

  		rx_queue_len = 0;
  	}
  }
  
  /* The inverse routine to net_open(). */
  static int
  e100_close(struct net_device *dev)
  {

  	struct net_local *np = netdev_priv(dev);

  
  	printk(KERN_INFO "Closing %s.
  ", dev->name);
  
  	netif_stop_queue(dev);
  
  	*R_IRQ_MASK0_CLR =
  		IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
  		IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
  		IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);
  
  	*R_IRQ_MASK2_CLR =
  		IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
  		IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
  		IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
  		IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);
  
  	/* Stop the receiver and the transmitter */
  
  	RESET_DMA(NETWORK_TX_DMA_NBR);
  	RESET_DMA(NETWORK_RX_DMA_NBR);
  
  	/* Flush the Tx and disable Rx here. */
  
  	free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
  	free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
  	free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);

  	cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
  	cris_free_dma(NETWORK_RX_DMA_NBR, cardname);

  	/* Update the statistics here. */
  
  	update_rx_stats(&np->stats);
  	update_tx_stats(&np->stats);
  
  	/* Stop speed/duplex timers */
  	del_timer(&speed_timer);
  	del_timer(&duplex_timer);
  
  	return 0;
  }
  
  static int
  e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
  {
  	struct mii_ioctl_data *data = if_mii(ifr);
  	struct net_local *np = netdev_priv(dev);

  	int rc = 0;
          int old_autoneg;

  
  	spin_lock(&np->lock); /* Preempt protection */
  	switch (cmd) {

  		/* The ioctls below should be considered obsolete but are */
  		/* still present for compatability with old scripts/apps  */
  		case SET_ETH_SPEED_10:                  /* 10 Mbps */
  			e100_set_speed(dev, 10);
  			break;
  		case SET_ETH_SPEED_100:                /* 100 Mbps */
  			e100_set_speed(dev, 100);
  			break;

  		case SET_ETH_SPEED_AUTO:        /* Auto-negotiate speed */

  			e100_set_speed(dev, 0);
  			break;

  		case SET_ETH_DUPLEX_HALF:       /* Half duplex */

  			e100_set_duplex(dev, half);
  			break;

  		case SET_ETH_DUPLEX_FULL:       /* Full duplex */

  			e100_set_duplex(dev, full);
  			break;

  		case SET_ETH_DUPLEX_AUTO:       /* Auto-negotiate duplex */

  			e100_set_duplex(dev, autoneg);
  			break;

  	        case SET_ETH_AUTONEG:
  			old_autoneg = autoneg_normal;
  		        autoneg_normal = *(int*)data;
  			if (autoneg_normal != old_autoneg)
  				e100_negotiate(dev);
  			break;

  		default:

  			rc = generic_mii_ioctl(&np->mii_if, if_mii(ifr),
  						cmd, NULL);
  			break;

  	}
  	spin_unlock(&np->lock);

  	return rc;

  }

  static int e100_get_settings(struct net_device *dev,
  			     struct ethtool_cmd *cmd)

  {

  	struct net_local *np = netdev_priv(dev);
  	int err;

  	spin_lock_irq(&np->lock);
  	err = mii_ethtool_gset(&np->mii_if, cmd);
  	spin_unlock_irq(&np->lock);

  	/* The PHY may support 1000baseT, but the Etrax100 does not.  */
  	cmd->supported &= ~(SUPPORTED_1000baseT_Half
  			    | SUPPORTED_1000baseT_Full);
  	return err;

  }
  
  static int e100_set_settings(struct net_device *dev,
  			     struct ethtool_cmd *ecmd)
  {
  	if (ecmd->autoneg == AUTONEG_ENABLE) {
  		e100_set_duplex(dev, autoneg);
  		e100_set_speed(dev, 0);
  	} else {
  		e100_set_duplex(dev, ecmd->duplex == DUPLEX_HALF ? half : full);
  		e100_set_speed(dev, ecmd->speed == SPEED_10 ? 10: 100);

  	}

  
  	return 0;
  }
  
  static void e100_get_drvinfo(struct net_device *dev,
  			     struct ethtool_drvinfo *info)
  {
  	strncpy(info->driver, "ETRAX 100LX", sizeof(info->driver) - 1);
  	strncpy(info->version, "$Revision: 1.31 $", sizeof(info->version) - 1);
  	strncpy(info->fw_version, "N/A", sizeof(info->fw_version) - 1);
  	strncpy(info->bus_info, "N/A", sizeof(info->bus_info) - 1);
  }
  
  static int e100_nway_reset(struct net_device *dev)
  {
  	if (current_duplex == autoneg && current_speed_selection == 0)
  		e100_negotiate(dev);

  	return 0;
  }

  static const struct ethtool_ops e100_ethtool_ops = {

  	.get_settings	= e100_get_settings,
  	.set_settings	= e100_set_settings,
  	.get_drvinfo	= e100_get_drvinfo,
  	.nway_reset	= e100_nway_reset,
  	.get_link	= ethtool_op_get_link,
  };

  static int
  e100_set_config(struct net_device *dev, struct ifmap *map)
  {

  	struct net_local *np = netdev_priv(dev);

  	spin_lock(&np->lock); /* Preempt protection */
  
  	switch(map->port) {
  		case IF_PORT_UNKNOWN:
  			/* Use autoneg */
  			e100_set_speed(dev, 0);
  			e100_set_duplex(dev, autoneg);
  			break;
  		case IF_PORT_10BASET:
  			e100_set_speed(dev, 10);
  			e100_set_duplex(dev, autoneg);
  			break;
  		case IF_PORT_100BASET:
  		case IF_PORT_100BASETX:
  			e100_set_speed(dev, 100);
  			e100_set_duplex(dev, autoneg);
  			break;
  		case IF_PORT_100BASEFX:
  		case IF_PORT_10BASE2:
  		case IF_PORT_AUI:
  			spin_unlock(&np->lock);
  			return -EOPNOTSUPP;
  			break;
  		default:
  			printk(KERN_ERR "%s: Invalid media selected", dev->name);
  			spin_unlock(&np->lock);
  			return -EINVAL;
  	}
  	spin_unlock(&np->lock);
  	return 0;
  }
  
  static void
  update_rx_stats(struct net_device_stats *es)
  {
  	unsigned long r = *R_REC_COUNTERS;
  	/* update stats relevant to reception errors */
  	es->rx_fifo_errors += IO_EXTRACT(R_REC_COUNTERS, congestion, r);
  	es->rx_crc_errors += IO_EXTRACT(R_REC_COUNTERS, crc_error, r);
  	es->rx_frame_errors += IO_EXTRACT(R_REC_COUNTERS, alignment_error, r);
  	es->rx_length_errors += IO_EXTRACT(R_REC_COUNTERS, oversize, r);
  }
  
  static void
  update_tx_stats(struct net_device_stats *es)
  {
  	unsigned long r = *R_TR_COUNTERS;
  	/* update stats relevant to transmission errors */
  	es->collisions +=
  		IO_EXTRACT(R_TR_COUNTERS, single_col, r) +
  		IO_EXTRACT(R_TR_COUNTERS, multiple_col, r);

  }
  
  /*
   * Get the current statistics.
   * This may be called with the card open or closed.
   */
  static struct net_device_stats *
  e100_get_stats(struct net_device *dev)
  {

  	struct net_local *lp = netdev_priv(dev);

  	unsigned long flags;

  	spin_lock_irqsave(&lp->lock, flags);
  
  	update_rx_stats(&lp->stats);
  	update_tx_stats(&lp->stats);
  
  	spin_unlock_irqrestore(&lp->lock, flags);
  	return &lp->stats;
  }
  
  /*
   * Set or clear the multicast filter for this adaptor.
   * num_addrs == -1	Promiscuous mode, receive all packets
   * num_addrs == 0	Normal mode, clear multicast list
   * num_addrs > 0	Multicast mode, receive normal and MC packets,
   *			and do best-effort filtering.
   */
  static void
  set_multicast_list(struct net_device *dev)
  {

  	struct net_local *lp = netdev_priv(dev);

  	int num_addr = dev->mc_count;
  	unsigned long int lo_bits;
  	unsigned long int hi_bits;

  	spin_lock(&lp->lock);

  	if (dev->flags & IFF_PROMISC) {

  		/* promiscuous mode */
  		lo_bits = 0xfffffffful;
  		hi_bits = 0xfffffffful;
  
  		/* Enable individual receive */
  		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, receive);
  		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
  	} else if (dev->flags & IFF_ALLMULTI) {
  		/* enable all multicasts */
  		lo_bits = 0xfffffffful;
  		hi_bits = 0xfffffffful;
  
  		/* Disable individual receive */
  		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
  		*R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
  	} else if (num_addr == 0) {
  		/* Normal, clear the mc list */
  		lo_bits = 0x00000000ul;
  		hi_bits = 0x00000000ul;
  
  		/* Disable individual receive */
  		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
  		*R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
  	} else {
  		/* MC mode, receive normal and MC packets */
  		char hash_ix;
  		struct dev_mc_list *dmi = dev->mc_list;
  		int i;
  		char *baddr;

  		lo_bits = 0x00000000ul;
  		hi_bits = 0x00000000ul;

  		for (i = 0; i < num_addr; i++) {

  			/* Calculate the hash index for the GA registers */
  
  			hash_ix = 0;
  			baddr = dmi->dmi_addr;
  			hash_ix ^= (*baddr) & 0x3f;
  			hash_ix ^= ((*baddr) >> 6) & 0x03;
  			++baddr;
  			hash_ix ^= ((*baddr) << 2) & 0x03c;
  			hash_ix ^= ((*baddr) >> 4) & 0xf;
  			++baddr;
  			hash_ix ^= ((*baddr) << 4) & 0x30;
  			hash_ix ^= ((*baddr) >> 2) & 0x3f;
  			++baddr;
  			hash_ix ^= (*baddr) & 0x3f;
  			hash_ix ^= ((*baddr) >> 6) & 0x03;
  			++baddr;
  			hash_ix ^= ((*baddr) << 2) & 0x03c;
  			hash_ix ^= ((*baddr) >> 4) & 0xf;
  			++baddr;
  			hash_ix ^= ((*baddr) << 4) & 0x30;
  			hash_ix ^= ((*baddr) >> 2) & 0x3f;
  
  			hash_ix &= 0x3f;
  
  			if (hash_ix >= 32) {
  				hi_bits |= (1 << (hash_ix-32));

  			} else {

  				lo_bits |= (1 << hash_ix);
  			}
  			dmi = dmi->next;
  		}
  		/* Disable individual receive */
  		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
  		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
  	}
  	*R_NETWORK_GA_0 = lo_bits;
  	*R_NETWORK_GA_1 = hi_bits;
  	spin_unlock(&lp->lock);
  }
  
  void

  e100_hardware_send_packet(struct net_local *np, char *buf, int length)

  {
  	D(printk("e100 send pack, buf 0x%x len %d
  ", buf, length));

  	spin_lock(&np->led_lock);

  	if (!led_active && time_after(jiffies, led_next_time)) {
  		/* light the network leds depending on the current speed. */
  		e100_set_network_leds(NETWORK_ACTIVITY);
  
  		/* Set the earliest time we may clear the LED */
  		led_next_time = jiffies + NET_FLASH_TIME;
  		led_active = 1;
  		mod_timer(&clear_led_timer, jiffies + HZ/10);
  	}

  	spin_unlock(&np->led_lock);

  
  	/* configure the tx dma descriptor */
  	myNextTxDesc->descr.sw_len = length;
  	myNextTxDesc->descr.ctrl = d_eop | d_eol | d_wait;
  	myNextTxDesc->descr.buf = virt_to_phys(buf);
  
          /* Move end of list */
          myLastTxDesc->descr.ctrl &= ~d_eol;
          myLastTxDesc = myNextTxDesc;
  
  	/* Restart DMA channel */
  	*R_DMA_CH0_CMD = IO_STATE(R_DMA_CH0_CMD, cmd, restart);
  }
  
  static void
  e100_clear_network_leds(unsigned long dummy)
  {

  	struct net_device *dev = (struct net_device *)dummy;
  	struct net_local *np = netdev_priv(dev);
  
  	spin_lock(&np->led_lock);

  	if (led_active && time_after(jiffies, led_next_time)) {
  		e100_set_network_leds(NO_NETWORK_ACTIVITY);
  
  		/* Set the earliest time we may set the LED */
  		led_next_time = jiffies + NET_FLASH_PAUSE;
  		led_active = 0;
  	}

  
  	spin_unlock(&np->led_lock);

  }
  
  static void
  e100_set_network_leds(int active)
  {
  #if defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK)
  	int light_leds = (active == NO_NETWORK_ACTIVITY);
  #elif defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY)
  	int light_leds = (active == NETWORK_ACTIVITY);
  #else
  #error "Define either CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK or CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY"
  #endif
  
  	if (!current_speed) {
  		/* Make LED red, link is down */
  #if defined(CONFIG_ETRAX_NETWORK_RED_ON_NO_CONNECTION)

  		CRIS_LED_NETWORK_SET(CRIS_LED_RED);

  #else

  		CRIS_LED_NETWORK_SET(CRIS_LED_OFF);

  #endif

  	} else if (light_leds) {

  		if (current_speed == 10) {

  			CRIS_LED_NETWORK_SET(CRIS_LED_ORANGE);

  		} else {

  			CRIS_LED_NETWORK_SET(CRIS_LED_GREEN);

  		}

  	} else {

  		CRIS_LED_NETWORK_SET(CRIS_LED_OFF);

  	}
  }

  #ifdef CONFIG_NET_POLL_CONTROLLER
  static void
  e100_netpoll(struct net_device* netdev)
  {
  	e100rxtx_interrupt(NETWORK_DMA_TX_IRQ_NBR, netdev, NULL);
  }
  #endif

  static int
  etrax_init_module(void)
  {
  	return etrax_ethernet_init();
  }
  
  static int __init
  e100_boot_setup(char* str)
  {
  	struct sockaddr sa = {0};
  	int i;
  
  	/* Parse the colon separated Ethernet station address */
  	for (i = 0; i <  ETH_ALEN; i++) {
  		unsigned int tmp;
  		if (sscanf(str + 3*i, "%2x", &tmp) != 1) {
  			printk(KERN_WARNING "Malformed station address");
  			return 0;
  		}
  		sa.sa_data[i] = (char)tmp;
  	}
  
  	default_mac = sa;
  	return 1;
  }
  
  __setup("etrax100_eth=", e100_boot_setup);
  
  module_init(etrax_init_module);