text: /*
   * net-3-driver for the NI5210 card (i82586 Ethernet chip)
   *
   * This is an extension to the Linux operating system, and is covered by the
   * same GNU General Public License that covers that work.
   *
   * Alphacode 0.82 (96/09/29) for Linux 2.0.0 (or later)
   * Copyrights (c) 1994,1995,1996 by M.Hipp (hippm@informatik.uni-tuebingen.de)
   *    [feel free to mail ....]
   *
   * when using as module: (no autoprobing!)
   *   run with e.g:
   *       insmod ni52.o io=0x360 irq=9 memstart=0xd0000 memend=0xd4000
   *
   * CAN YOU PLEASE REPORT ME YOUR PERFORMANCE EXPERIENCES !!.
   *
   * If you find a bug, please report me:
   *   The kernel panic output and any kmsg from the ni52 driver
   *   the ni5210-driver-version and the linux-kernel version
   *   how many shared memory (memsize) on the netcard,
   *   bootprom: yes/no, base_addr, mem_start
   *   maybe the ni5210-card revision and the i82586 version
   *
   * autoprobe for: base_addr: 0x300,0x280,0x360,0x320,0x340
   *                mem_start: 0xd0000,0xd2000,0xc8000,0xca000,0xd4000,0xd6000,
   *                           0xd8000,0xcc000,0xce000,0xda000,0xdc000
   *
   * sources:
   *   skeleton.c from Donald Becker
   *
   * I have also done a look in the following sources: (mail me if you need them)
   *   crynwr-packet-driver by Russ Nelson
   *   Garret A. Wollman's (fourth) i82586-driver for BSD
   *   (before getting an i82596 (yes 596 not 586) manual, the existing drivers
   *    helped me a lot to understand this tricky chip.)
   *
   * Known Problems:
   *   The internal sysbus seems to be slow. So we often lose packets because of
   *   overruns while receiving from a fast remote host.
   *   This can slow down TCP connections. Maybe the newer ni5210 cards are
   *   better. My experience is, that if a machine sends with more than about
   *   500-600K/s the fifo/sysbus overflows.
   *
   * IMPORTANT NOTE:
   *   On fast networks, it's a (very) good idea to have 16K shared memory. With
   *   8K, we can store only 4 receive frames, so it can (easily) happen that a
   *   remote machine 'overruns' our system.
   *
   * Known i82586/card problems (I'm sure, there are many more!):
   *   Running the NOP-mode, the i82586 sometimes seems to forget to report
   *   every xmit-interrupt until we restart the CU.
   *   Another MAJOR bug is, that the RU sometimes seems to ignore the EL-Bit
   *   in the RBD-Struct which indicates an end of the RBD queue.
   *   Instead, the RU fetches another (randomly selected and
   *   usually used) RBD and begins to fill it. (Maybe, this happens only if
   *   the last buffer from the previous RFD fits exact into the queue and
   *   the next RFD can't fetch an initial RBD. Anyone knows more? )
   *
   * results from ftp performance tests with Linux 1.2.5
   *   send and receive about 350-400 KByte/s (peak up to 460 kbytes/s)
   *   sending in NOP-mode: peak performance up to 530K/s (but better don't
   *   run this mode)
   */
  
  /*
   * 29.Sept.96: virt_to_bus changes for new memory scheme
   * 19.Feb.96: more Mcast changes, module support (MH)
   *
   * 18.Nov.95: Mcast changes (AC).
   *
   * 23.April.95: fixed(?) receiving problems by configuring a RFD more
   *              than the number of RBD's. Can maybe cause other problems.
   * 18.April.95: Added MODULE support (MH)
   * 17.April.95: MC related changes in init586() and set_multicast_list().
   *              removed use of 'jiffies' in init586() (MH)
   *
   * 19.Sep.94: Added Multicast support (not tested yet) (MH)
   *
   * 18.Sep.94: Workaround for 'EL-Bug'. Removed flexible RBD-handling.
   *            Now, every RFD has exact one RBD. (MH)
   *
   * 14.Sep.94: added promiscuous mode, a few cleanups (MH)
   *
   * 19.Aug.94: changed request_irq() parameter (MH)
   *
   * 20.July.94: removed cleanup bugs, removed a 16K-mem-probe-bug (MH)
   *
   * 19.July.94: lotsa cleanups .. (MH)
   *
   * 17.July.94: some patches ... verified to run with 1.1.29 (MH)
   *
   * 4.July.94: patches for Linux 1.1.24  (MH)
   *
   * 26.March.94: patches for Linux 1.0 and iomem-auto-probe (MH)
   *
   * 30.Sep.93: Added nop-chain .. driver now runs with only one Xmit-Buff,
   *				too (MH)
   *
   * < 30.Sep.93: first versions
   */
  
  static int debuglevel;	/* debug-printk 0: off 1: a few 2: more */
  static int automatic_resume; /* experimental .. better should be zero */
  static int rfdadd;	/* rfdadd=1 may be better for 8K MEM cards */
  static int fifo = 0x8;	/* don't change */
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/errno.h>
  #include <linux/ioport.h>
  #include <linux/interrupt.h>
  #include <linux/delay.h>
  #include <linux/init.h>
  #include <linux/bitops.h>
  #include <asm/io.h>
  
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  
  #include "ni52.h"
  
  #define DRV_NAME "ni52"
  
  #define DEBUG       /* debug on */
  #define SYSBUSVAL 1 /* 8 Bit */
  
  #define ni_attn586()  { outb(0, dev->base_addr + NI52_ATTENTION); }
  #define ni_reset586() { outb(0, dev->base_addr + NI52_RESET); }
  #define ni_disint()   { outb(0, dev->base_addr + NI52_INTDIS); }
  #define ni_enaint()   { outb(0, dev->base_addr + NI52_INTENA); }
  
  #define make32(ptr16) ((void __iomem *)(p->memtop + (short) (ptr16)))
  #define make24(ptr32) ((char __iomem *)(ptr32)) - p->base
  #define make16(ptr32) ((unsigned short) ((char __iomem *)(ptr32)\
  					- p->memtop))
  
  /******************* how to calculate the buffers *****************************
  
    * IMPORTANT NOTE: if you configure only one NUM_XMIT_BUFFS, the driver works
    * --------------- in a different (more stable?) mode. Only in this mode it's
    *                 possible to configure the driver with 'NO_NOPCOMMANDS'
  
  sizeof(scp)=12; sizeof(scb)=16; sizeof(iscp)=8;
  sizeof(scp)+sizeof(iscp)+sizeof(scb) = 36 = INIT
  sizeof(rfd) = 24; sizeof(rbd) = 12;
  sizeof(tbd) = 8; sizeof(transmit_cmd) = 16;
  sizeof(nop_cmd) = 8;
  
    * if you don't know the driver, better do not change these values: */
  
  #define RECV_BUFF_SIZE 1524 /* slightly oversized */
  #define XMIT_BUFF_SIZE 1524 /* slightly oversized */
  #define NUM_XMIT_BUFFS 1    /* config for both, 8K and 16K shmem */
  #define NUM_RECV_BUFFS_8  4 /* config for 8K shared mem */
  #define NUM_RECV_BUFFS_16 9 /* config for 16K shared mem */
  #define NO_NOPCOMMANDS      /* only possible with NUM_XMIT_BUFFS=1 */
  
  /**************************************************************************/
  
  
  #define NI52_TOTAL_SIZE 16
  #define NI52_ADDR0 0x02
  #define NI52_ADDR1 0x07
  #define NI52_ADDR2 0x01
  
  static int     ni52_probe1(struct net_device *dev, int ioaddr);
  static irqreturn_t ni52_interrupt(int irq, void *dev_id);
  static int     ni52_open(struct net_device *dev);
  static int     ni52_close(struct net_device *dev);
  static netdev_tx_t ni52_send_packet(struct sk_buff *, struct net_device *);
  static struct  net_device_stats *ni52_get_stats(struct net_device *dev);
  static void    set_multicast_list(struct net_device *dev);
  static void    ni52_timeout(struct net_device *dev);
  
  /* helper-functions */
  static int     init586(struct net_device *dev);
  static int     check586(struct net_device *dev, unsigned size);
  static void    alloc586(struct net_device *dev);
  static void    startrecv586(struct net_device *dev);
  static void   __iomem *alloc_rfa(struct net_device *dev, void __iomem *ptr);
  static void    ni52_rcv_int(struct net_device *dev);
  static void    ni52_xmt_int(struct net_device *dev);
  static void    ni52_rnr_int(struct net_device *dev);
  
  struct priv {
  	char __iomem *base;
  	char __iomem *mapped;
  	char __iomem *memtop;
  	spinlock_t spinlock;
  	int reset;
  	struct rfd_struct __iomem *rfd_last, *rfd_top, *rfd_first;
  	struct scp_struct __iomem *scp;
  	struct iscp_struct __iomem *iscp;
  	struct scb_struct __iomem *scb;
  	struct tbd_struct __iomem *xmit_buffs[NUM_XMIT_BUFFS];
  #if (NUM_XMIT_BUFFS == 1)
  	struct transmit_cmd_struct __iomem *xmit_cmds[2];
  	struct nop_cmd_struct __iomem *nop_cmds[2];
  #else
  	struct transmit_cmd_struct __iomem *xmit_cmds[NUM_XMIT_BUFFS];
  	struct nop_cmd_struct __iomem *nop_cmds[NUM_XMIT_BUFFS];
  #endif
  	int nop_point, num_recv_buffs;
  	char __iomem *xmit_cbuffs[NUM_XMIT_BUFFS];
  	int xmit_count, xmit_last;
  };
  
  /* wait for command with timeout: */
  static void wait_for_scb_cmd(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  	int i;
  	for (i = 0; i < 16384; i++) {
  		if (readb(&p->scb->cmd_cuc) == 0)
  		      break;
  		udelay(4);
  		if (i == 16383) {
  			printk(KERN_ERR "%s: scb_cmd timed out: %04x,%04x .. disabling i82586!!\n",
  				dev->name, readb(&p->scb->cmd_cuc), readb(&p->scb->cus));
  			if (!p->reset) {
  				p->reset = 1;
  				ni_reset586();
  			}
  		}
  	}
  }
  
  static void wait_for_scb_cmd_ruc(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  	int i;
  	for (i = 0; i < 16384; i++) {
  		if (readb(&p->scb->cmd_ruc) == 0)
  			break;
  		udelay(4);
  		if (i == 16383) {
  			printk(KERN_ERR "%s: scb_cmd (ruc) timed out: %04x,%04x .. disabling i82586!!\n",
  				dev->name, readb(&p->scb->cmd_ruc),
  				readb(&p->scb->rus));
  			if (!p->reset) {
  				p->reset = 1;
  				ni_reset586();
  			}
  		}
  	}
  }
  
  static void wait_for_stat_compl(void __iomem *p)
  {
  	struct nop_cmd_struct __iomem *addr = p;
  	int i;
  	for (i = 0; i < 32767; i++) {
  		if (readw(&((addr)->cmd_status)) & STAT_COMPL)
  			break;
  		udelay(32);
  	}
  }
  
  /**********************************************
   * close device
   */
  static int ni52_close(struct net_device *dev)
  {
  	free_irq(dev->irq, dev);
  	ni_reset586(); /* the hard way to stop the receiver */
  	netif_stop_queue(dev);
  	return 0;
  }
  
  /**********************************************
   * open device
   */
  static int ni52_open(struct net_device *dev)
  {
  	int ret;
  
  	ni_disint();
  	alloc586(dev);
  	init586(dev);
  	startrecv586(dev);
  	ni_enaint();
  
  	ret = request_irq(dev->irq, ni52_interrupt, 0, dev->name, dev);
  	if (ret) {
  		ni_reset586();
  		return ret;
  	}
  	netif_start_queue(dev);
  	return 0; /* most done by init */
  }
  
  static int check_iscp(struct net_device *dev, void __iomem *addr)
  {
  	struct iscp_struct __iomem *iscp = addr;
  	struct priv *p = netdev_priv(dev);
  	memset_io(iscp, 0, sizeof(struct iscp_struct));
  
  	writel(make24(iscp), &p->scp->iscp);
  	writeb(1, &iscp->busy);
  
  	ni_reset586();
  	ni_attn586();
  	mdelay(32);	/* wait a while... */
  	/* i82586 clears 'busy' after successful init */
  	if (readb(&iscp->busy))
  		return 0;
  	return 1;
  }
  
  /**********************************************
   * Check to see if there's an 82586 out there.
   */
  static int check586(struct net_device *dev, unsigned size)
  {
  	struct priv *p = netdev_priv(dev);
  	int i;
  
  	p->mapped = ioremap(dev->mem_start, size);
  	if (!p->mapped)
  		return 0;
  
  	p->base = p->mapped + size - 0x01000000;
  	p->memtop = p->mapped + size;
  	p->scp = (struct scp_struct __iomem *)(p->base + SCP_DEFAULT_ADDRESS);
  	p->scb	= (struct scb_struct __iomem *)	p->mapped;
  	p->iscp = (struct iscp_struct __iomem *)p->scp - 1;
  	memset_io(p->scp, 0, sizeof(struct scp_struct));
  	for (i = 0; i < sizeof(struct scp_struct); i++)
  		/* memory was writeable? */
  		if (readb((char __iomem *)p->scp + i))
  			goto Enodev;
  	writeb(SYSBUSVAL, &p->scp->sysbus);	/* 1 = 8Bit-Bus, 0 = 16 Bit */
  	if (readb(&p->scp->sysbus) != SYSBUSVAL)
  		goto Enodev;
  
  	if (!check_iscp(dev, p->mapped))
  		goto Enodev;
  	if (!check_iscp(dev, p->iscp))
  		goto Enodev;
  	return 1;
  Enodev:
  	iounmap(p->mapped);
  	return 0;
  }
  
  /******************************************************************
   * set iscp at the right place, called by ni52_probe1 and open586.
   */
  static void alloc586(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  
  	ni_reset586();
  	mdelay(32);
  
  	memset_io(p->iscp, 0, sizeof(struct iscp_struct));
  	memset_io(p->scp , 0, sizeof(struct scp_struct));
  
  	writel(make24(p->iscp), &p->scp->iscp);
  	writeb(SYSBUSVAL, &p->scp->sysbus);
  	writew(make16(p->scb), &p->iscp->scb_offset);
  
  	writeb(1, &p->iscp->busy);
  	ni_reset586();
  	ni_attn586();
  
  	mdelay(32);
  
  	if (readb(&p->iscp->busy))
  		printk(KERN_ERR "%s: Init-Problems (alloc).\n", dev->name);
  
  	p->reset = 0;
  
  	memset_io(p->scb, 0, sizeof(struct scb_struct));
  }
  
  /* set: io,irq,memstart,memend or set it when calling insmod */
  static int irq = 9;
  static int io = 0x300;
  static long memstart;	/* e.g 0xd0000 */
  static long memend;	/* e.g 0xd4000 */
  
  /**********************************************
   * probe the ni5210-card
   */
  struct net_device * __init ni52_probe(int unit)
  {
  	struct net_device *dev = alloc_etherdev(sizeof(struct priv));
  	static const int ports[] = {0x300, 0x280, 0x360, 0x320, 0x340, 0};
  	const int *port;
  	struct priv *p;
  	int err = 0;
  
  	if (!dev)
  		return ERR_PTR(-ENOMEM);
  
  	p = netdev_priv(dev);
  
  	if (unit >= 0) {
  		sprintf(dev->name, "eth%d", unit);
  		netdev_boot_setup_check(dev);
  		io = dev->base_addr;
  		irq = dev->irq;
  		memstart = dev->mem_start;
  		memend = dev->mem_end;
  	}
  
  	if (io > 0x1ff)	{	/* Check a single specified location. */
  		err = ni52_probe1(dev, io);
  	} else if (io > 0) {		/* Don't probe at all. */
  		err = -ENXIO;
  	} else {
  		for (port = ports; *port && ni52_probe1(dev, *port) ; port++)
  			;
  		if (*port)
  			goto got_it;
  #ifdef FULL_IO_PROBE
  		for (io = 0x200; io < 0x400 && ni52_probe1(dev, io); io += 8)
  			;
  		if (io < 0x400)
  			goto got_it;
  #endif
  		err = -ENODEV;
  	}
  	if (err)
  		goto out;
  got_it:
  	err = register_netdev(dev);
  	if (err)
  		goto out1;
  	return dev;
  out1:
  	iounmap(p->mapped);
  	release_region(dev->base_addr, NI52_TOTAL_SIZE);
  out:
  	free_netdev(dev);
  	return ERR_PTR(err);
  }
  
  static const struct net_device_ops ni52_netdev_ops = {
  	.ndo_open		= ni52_open,
  	.ndo_stop		= ni52_close,
  	.ndo_get_stats		= ni52_get_stats,
  	.ndo_tx_timeout 	= ni52_timeout,
  	.ndo_start_xmit 	= ni52_send_packet,
  	.ndo_set_rx_mode	= set_multicast_list,
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_set_mac_address 	= eth_mac_addr,
  	.ndo_validate_addr	= eth_validate_addr,
  };
  
  static int __init ni52_probe1(struct net_device *dev, int ioaddr)
  {
  	int i, size, retval;
  	struct priv *priv = netdev_priv(dev);
  
  	dev->base_addr = ioaddr;
  	dev->irq = irq;
  	dev->mem_start = memstart;
  	dev->mem_end = memend;
  
  	spin_lock_init(&priv->spinlock);
  
  	if (!request_region(ioaddr, NI52_TOTAL_SIZE, DRV_NAME))
  		return -EBUSY;
  
  	if (!(inb(ioaddr+NI52_MAGIC1) == NI52_MAGICVAL1) ||
  	    !(inb(ioaddr+NI52_MAGIC2) == NI52_MAGICVAL2)) {
  		retval = -ENODEV;
  		goto out;
  	}
  
  	for (i = 0; i < ETH_ALEN; i++)
  		dev->dev_addr[i] = inb(dev->base_addr+i);
  
  	if (dev->dev_addr[0] != NI52_ADDR0 || dev->dev_addr[1] != NI52_ADDR1 ||
  	    dev->dev_addr[2] != NI52_ADDR2) {
  		retval = -ENODEV;
  		goto out;
  	}
  
  	printk(KERN_INFO "%s: NI5210 found at %#3lx, ",
  				dev->name, dev->base_addr);
  
  	/*
  	 * check (or search) IO-Memory, 8K and 16K
  	 */
  #ifdef MODULE
  	size = dev->mem_end - dev->mem_start;
  	if (size != 0x2000 && size != 0x4000) {
  		printk("\n");
  		printk(KERN_ERR "%s: Invalid memory size %d. Allowed is 0x2000 or 0x4000 bytes.\n", dev->name, size);
  		retval = -ENODEV;
  		goto out;
  	}
  	if (!check586(dev, size)) {
  		printk(KERN_ERR "?memcheck, Can't find memory at 0x%lx with size %d!\n", dev->mem_start, size);
  		retval = -ENODEV;
  		goto out;
  	}
  #else
  	if (dev->mem_start != 0) {
  		/* no auto-mem-probe */
  		size = 0x4000; /* check for 16K mem */
  		if (!check586(dev, size)) {
  			size = 0x2000; /* check for 8K mem */
  			if (!check586(dev, size)) {
  				printk(KERN_ERR "?memprobe, Can't find memory at 0x%lx!\n", dev->mem_start);
  				retval = -ENODEV;
  				goto out;
  			}
  		}
  	} else {
  		static const unsigned long memaddrs[] = {
  			0xc8000, 0xca000, 0xcc000, 0xce000, 0xd0000, 0xd2000,
  			0xd4000, 0xd6000, 0xd8000, 0xda000, 0xdc000, 0
  		};
  		for (i = 0;; i++) {
  			if (!memaddrs[i]) {
  				printk(KERN_ERR "?memprobe, Can't find io-memory!\n");
  				retval = -ENODEV;
  				goto out;
  			}
  			dev->mem_start = memaddrs[i];
  			size = 0x2000; /* check for 8K mem */
  			if (check586(dev, size))
  				/* 8K-check */
  				break;
  			size = 0x4000; /* check for 16K mem */
  			if (check586(dev, size))
  				/* 16K-check */
  				break;
  		}
  	}
  	/* set mem_end showed by 'ifconfig' */
  	dev->mem_end = dev->mem_start + size;
  #endif
  
  	alloc586(dev);
  
  	/* set number of receive-buffs according to memsize */
  	if (size == 0x2000)
  		priv->num_recv_buffs = NUM_RECV_BUFFS_8;
  	else
  		priv->num_recv_buffs = NUM_RECV_BUFFS_16;
  
  	printk(KERN_DEBUG "Memaddr: 0x%lx, Memsize: %d, ",
  				dev->mem_start, size);
  
  	if (dev->irq < 2) {
  		unsigned long irq_mask;
  
  		irq_mask = probe_irq_on();
  		ni_reset586();
  		ni_attn586();
  
  		mdelay(20);
  		dev->irq = probe_irq_off(irq_mask);
  		if (!dev->irq) {
  			printk("?autoirq, Failed to detect IRQ line!\n");
  			retval = -EAGAIN;
  			iounmap(priv->mapped);
  			goto out;
  		}
  		printk("IRQ %d (autodetected).\n", dev->irq);
  	} else {
  		if (dev->irq == 2)
  			dev->irq = 9;
  		printk("IRQ %d (assigned and not checked!).\n", dev->irq);
  	}
  
  	dev->netdev_ops		= &ni52_netdev_ops;
  	dev->watchdog_timeo	= HZ/20;
  
  	return 0;
  out:
  	release_region(ioaddr, NI52_TOTAL_SIZE);
  	return retval;
  }
  
  /**********************************************
   * init the chip (ni52-interrupt should be disabled?!)
   * needs a correct 'allocated' memory
   */
  
  static int init586(struct net_device *dev)
  {
  	void __iomem *ptr;
  	int i, result = 0;
  	struct priv *p = netdev_priv(dev);
  	struct configure_cmd_struct __iomem *cfg_cmd;
  	struct iasetup_cmd_struct __iomem *ias_cmd;
  	struct tdr_cmd_struct __iomem *tdr_cmd;
  	struct mcsetup_cmd_struct __iomem *mc_cmd;
  	struct netdev_hw_addr *ha;
  	int num_addrs = netdev_mc_count(dev);
  
  	ptr = p->scb + 1;
  
  	cfg_cmd = ptr; /* configure-command */
  	writew(0, &cfg_cmd->cmd_status);
  	writew(CMD_CONFIGURE | CMD_LAST, &cfg_cmd->cmd_cmd);
  	writew(0xFFFF, &cfg_cmd->cmd_link);
  
  	/* number of cfg bytes */
  	writeb(0x0a, &cfg_cmd->byte_cnt);
  	/* fifo-limit (8=tx:32/rx:64) */
  	writeb(fifo, &cfg_cmd->fifo);
  	/* hold or discard bad recv frames (bit 7) */
  	writeb(0x40, &cfg_cmd->sav_bf);
  	/* addr_len |!src_insert |pre-len |loopback */
  	writeb(0x2e, &cfg_cmd->adr_len);
  	writeb(0x00, &cfg_cmd->priority);
  	writeb(0x60, &cfg_cmd->ifs);
  	writeb(0x00, &cfg_cmd->time_low);
  	writeb(0xf2, &cfg_cmd->time_high);
  	writeb(0x00, &cfg_cmd->promisc);
  	if (dev->flags & IFF_ALLMULTI) {
  		int len = ((char __iomem *)p->iscp - (char __iomem *)ptr - 8) / 6;
  		if (num_addrs > len) {
  			printk(KERN_ERR "%s: switching to promisc. mode\n",
  				dev->name);
  			writeb(0x01, &cfg_cmd->promisc);
  		}
  	}
  	if (dev->flags & IFF_PROMISC)
  		writeb(0x01, &cfg_cmd->promisc);
  	writeb(0x00, &cfg_cmd->carr_coll);
  	writew(make16(cfg_cmd), &p->scb->cbl_offset);
  	writeb(0, &p->scb->cmd_ruc);
  
  	writeb(CUC_START, &p->scb->cmd_cuc); /* cmd.-unit start */
  	ni_attn586();
  
  	wait_for_stat_compl(cfg_cmd);
  
  	if ((readw(&cfg_cmd->cmd_status) & (STAT_OK|STAT_COMPL)) !=
  							(STAT_COMPL|STAT_OK)) {
  		printk(KERN_ERR "%s: configure command failed: %x\n",
  				dev->name, readw(&cfg_cmd->cmd_status));
  		return 1;
  	}
  
  	/*
  	 * individual address setup
  	 */
  
  	ias_cmd = ptr;
  
  	writew(0, &ias_cmd->cmd_status);
  	writew(CMD_IASETUP | CMD_LAST, &ias_cmd->cmd_cmd);
  	writew(0xffff, &ias_cmd->cmd_link);
  
  	memcpy_toio(&ias_cmd->iaddr, (char *)dev->dev_addr, ETH_ALEN);
  
  	writew(make16(ias_cmd), &p->scb->cbl_offset);
  
  	writeb(CUC_START, &p->scb->cmd_cuc); /* cmd.-unit start */
  	ni_attn586();
  
  	wait_for_stat_compl(ias_cmd);
  
  	if ((readw(&ias_cmd->cmd_status) & (STAT_OK|STAT_COMPL)) !=
  							(STAT_OK|STAT_COMPL)) {
  		printk(KERN_ERR "%s (ni52): individual address setup command failed: %04x\n", dev->name, readw(&ias_cmd->cmd_status));
  		return 1;
  	}
  
  	/*
  	 * TDR, wire check .. e.g. no resistor e.t.c
  	 */
  
  	tdr_cmd = ptr;
  
  	writew(0, &tdr_cmd->cmd_status);
  	writew(CMD_TDR | CMD_LAST, &tdr_cmd->cmd_cmd);
  	writew(0xffff, &tdr_cmd->cmd_link);
  	writew(0, &tdr_cmd->status);
  
  	writew(make16(tdr_cmd), &p->scb->cbl_offset);
  	writeb(CUC_START, &p->scb->cmd_cuc); /* cmd.-unit start */
  	ni_attn586();
  
  	wait_for_stat_compl(tdr_cmd);
  
  	if (!(readw(&tdr_cmd->cmd_status) & STAT_COMPL))
  		printk(KERN_ERR "%s: Problems while running the TDR.\n",
  				dev->name);
  	else {
  		udelay(16);
  		result = readw(&tdr_cmd->status);
  		writeb(readb(&p->scb->cus) & STAT_MASK, &p->scb->cmd_cuc);
  		ni_attn586(); /* ack the interrupts */
  
  		if (result & TDR_LNK_OK)
  			;
  		else if (result & TDR_XCVR_PRB)
  			printk(KERN_ERR "%s: TDR: Transceiver problem. Check the cable(s)!\n",
  				dev->name);
  		else if (result & TDR_ET_OPN)
  			printk(KERN_ERR "%s: TDR: No correct termination %d clocks away.\n",
  				dev->name, result & TDR_TIMEMASK);
  		else if (result & TDR_ET_SRT) {
  			/* time == 0 -> strange :-) */
  			if (result & TDR_TIMEMASK)
  				printk(KERN_ERR "%s: TDR: Detected a short circuit %d clocks away.\n",
  					dev->name, result & TDR_TIMEMASK);
  		} else
  			printk(KERN_ERR "%s: TDR: Unknown status %04x\n",
  						dev->name, result);
  	}
  
  	/*
  	 * Multicast setup
  	 */
  	if (num_addrs && !(dev->flags & IFF_PROMISC)) {
  		mc_cmd = ptr;
  		writew(0, &mc_cmd->cmd_status);
  		writew(CMD_MCSETUP | CMD_LAST, &mc_cmd->cmd_cmd);
  		writew(0xffff, &mc_cmd->cmd_link);
  		writew(num_addrs * 6, &mc_cmd->mc_cnt);
  
  		i = 0;
  		netdev_for_each_mc_addr(ha, dev)
  			memcpy_toio(mc_cmd->mc_list[i++], ha->addr, 6);
  
  		writew(make16(mc_cmd), &p->scb->cbl_offset);
  		writeb(CUC_START, &p->scb->cmd_cuc);
  		ni_attn586();
  
  		wait_for_stat_compl(mc_cmd);
  
  		if ((readw(&mc_cmd->cmd_status) & (STAT_COMPL|STAT_OK))
  						 != (STAT_COMPL|STAT_OK))
  			printk(KERN_ERR "%s: Can't apply multicast-address-list.\n", dev->name);
  	}
  
  	/*
  	 * alloc nop/xmit-cmds
  	 */
  #if (NUM_XMIT_BUFFS == 1)
  	for (i = 0; i < 2; i++) {
  		p->nop_cmds[i] = ptr;
  		writew(CMD_NOP, &p->nop_cmds[i]->cmd_cmd);
  		writew(0, &p->nop_cmds[i]->cmd_status);
  		writew(make16(p->nop_cmds[i]), &p->nop_cmds[i]->cmd_link);
  		ptr = ptr + sizeof(struct nop_cmd_struct);
  	}
  #else
  	for (i = 0; i < NUM_XMIT_BUFFS; i++) {
  		p->nop_cmds[i] = ptr;
  		writew(CMD_NOP, &p->nop_cmds[i]->cmd_cmd);
  		writew(0, &p->nop_cmds[i]->cmd_status);
  		writew(make16(p->nop_cmds[i]), &p->nop_cmds[i]->cmd_link);
  		ptr = ptr + sizeof(struct nop_cmd_struct);
  	}
  #endif
  
  	ptr = alloc_rfa(dev, ptr); /* init receive-frame-area */
  
  	/*
  	 * alloc xmit-buffs / init xmit_cmds
  	 */
  	for (i = 0; i < NUM_XMIT_BUFFS; i++) {
  		/* Transmit cmd/buff 0 */
  		p->xmit_cmds[i] = ptr;
  		ptr = ptr + sizeof(struct transmit_cmd_struct);
  		p->xmit_cbuffs[i] = ptr; /* char-buffs */
  		ptr = ptr + XMIT_BUFF_SIZE;
  		p->xmit_buffs[i] = ptr; /* TBD */
  		ptr = ptr + sizeof(struct tbd_struct);
  		if ((void __iomem *)ptr > (void __iomem *)p->iscp) {
  			printk(KERN_ERR "%s: not enough shared-mem for your configuration!\n",
  				dev->name);
  			return 1;
  		}
  		memset_io(p->xmit_cmds[i], 0,
  					sizeof(struct transmit_cmd_struct));
  		memset_io(p->xmit_buffs[i], 0,
  					sizeof(struct tbd_struct));
  		writew(make16(p->nop_cmds[(i+1)%NUM_XMIT_BUFFS]),
  					&p->xmit_cmds[i]->cmd_link);
  		writew(STAT_COMPL, &p->xmit_cmds[i]->cmd_status);
  		writew(CMD_XMIT|CMD_INT, &p->xmit_cmds[i]->cmd_cmd);
  		writew(make16(p->xmit_buffs[i]), &p->xmit_cmds[i]->tbd_offset);
  		writew(0xffff, &p->xmit_buffs[i]->next);
  		writel(make24(p->xmit_cbuffs[i]), &p->xmit_buffs[i]->buffer);
  	}
  
  	p->xmit_count = 0;
  	p->xmit_last	= 0;
  #ifndef NO_NOPCOMMANDS
  	p->nop_point	= 0;
  #endif
  
  	 /*
  		* 'start transmitter'
  		*/
  #ifndef NO_NOPCOMMANDS
  	writew(make16(p->nop_cmds[0]), &p->scb->cbl_offset);
  	writeb(CUC_START, &p->scb->cmd_cuc);
  	ni_attn586();
  	wait_for_scb_cmd(dev);
  #else
  	writew(make16(p->xmit_cmds[0]), &p->xmit_cmds[0]->cmd_link);
  	writew(CMD_XMIT | CMD_SUSPEND | CMD_INT, &p->xmit_cmds[0]->cmd_cmd);
  #endif
  
  	/*
  	 * ack. interrupts
  	 */
  	writeb(readb(&p->scb->cus) & STAT_MASK, &p->scb->cmd_cuc);
  	ni_attn586();
  	udelay(16);
  
  	ni_enaint();
  
  	return 0;
  }
  
  /******************************************************
   * This is a helper routine for ni52_rnr_int() and init586().
   * It sets up the Receive Frame Area (RFA).
   */
  
  static void __iomem *alloc_rfa(struct net_device *dev, void __iomem *ptr)
  {
  	struct rfd_struct __iomem *rfd = ptr;
  	struct rbd_struct __iomem *rbd;
  	int i;
  	struct priv *p = netdev_priv(dev);
  
  	memset_io(rfd, 0,
  		sizeof(struct rfd_struct) * (p->num_recv_buffs + rfdadd));
  	p->rfd_first = rfd;
  
  	for (i = 0; i < (p->num_recv_buffs + rfdadd); i++) {
  		writew(make16(rfd + (i+1) % (p->num_recv_buffs+rfdadd)),
  			&rfd[i].next);
  		writew(0xffff, &rfd[i].rbd_offset);
  	}
  	/* RU suspend */
  	writeb(RFD_SUSP, &rfd[p->num_recv_buffs-1+rfdadd].last);
  
  	ptr = rfd + (p->num_recv_buffs + rfdadd);
  
  	rbd = ptr;
  	ptr = rbd + p->num_recv_buffs;
  
  	 /* clr descriptors */
  	memset_io(rbd, 0, sizeof(struct rbd_struct) * (p->num_recv_buffs));
  
  	for (i = 0; i < p->num_recv_buffs; i++) {
  		writew(make16(rbd + (i+1) % p->num_recv_buffs), &rbd[i].next);
  		writew(RECV_BUFF_SIZE, &rbd[i].size);
  		writel(make24(ptr), &rbd[i].buffer);
  		ptr = ptr + RECV_BUFF_SIZE;
  	}
  	p->rfd_top	= p->rfd_first;
  	p->rfd_last = p->rfd_first + (p->num_recv_buffs - 1 + rfdadd);
  
  	writew(make16(p->rfd_first), &p->scb->rfa_offset);
  	writew(make16(rbd), &p->rfd_first->rbd_offset);
  
  	return ptr;
  }
  
  
  /**************************************************
   * Interrupt Handler ...
   */
  
  static irqreturn_t ni52_interrupt(int irq, void *dev_id)
  {
  	struct net_device *dev = dev_id;
  	unsigned int stat;
  	int cnt = 0;
  	struct priv *p;
  
  	p = netdev_priv(dev);
  
  	if (debuglevel > 1)
  		printk("I");
  
  	spin_lock(&p->spinlock);
  
  	wait_for_scb_cmd(dev); /* wait for last command	*/
  
  	while ((stat = readb(&p->scb->cus) & STAT_MASK)) {
  		writeb(stat, &p->scb->cmd_cuc);
  		ni_attn586();
  
  		if (stat & STAT_FR)	 /* received a frame */
  			ni52_rcv_int(dev);
  
  		if (stat & STAT_RNR) { /* RU went 'not ready' */
  			printk("(R)");
  			if (readb(&p->scb->rus) & RU_SUSPEND) {
  				/* special case: RU_SUSPEND */
  				wait_for_scb_cmd(dev);
  				writeb(RUC_RESUME, &p->scb->cmd_ruc);
  				ni_attn586();
  				wait_for_scb_cmd_ruc(dev);
  			} else {
  				printk(KERN_ERR "%s: Receiver-Unit went 'NOT READY': %04x/%02x.\n",
  					dev->name, stat, readb(&p->scb->rus));
  				ni52_rnr_int(dev);
  			}
  		}
  
  		/* Command with I-bit set complete */
  		if (stat & STAT_CX)
  			 ni52_xmt_int(dev);
  
  #ifndef NO_NOPCOMMANDS
  		if (stat & STAT_CNA) {	/* CU went 'not ready' */
  			if (netif_running(dev))
  				printk(KERN_ERR "%s: oops! CU has left active state. stat: %04x/%02x.\n",
  					dev->name, stat, readb(&p->scb->cus));
  		}
  #endif
  
  		if (debuglevel > 1)
  			printk("%d", cnt++);
  
  		/* Wait for ack. (ni52_xmt_int can be faster than ack!!) */
  		wait_for_scb_cmd(dev);
  		if (readb(&p->scb->cmd_cuc)) {	 /* timed out? */
  			printk(KERN_ERR "%s: Acknowledge timed out.\n",
  				dev->name);
  			ni_disint();
  			break;
  		}
  	}
  	spin_unlock(&p->spinlock);
  
  	if (debuglevel > 1)
  		printk("i");
  	return IRQ_HANDLED;
  }
  
  /*******************************************************
   * receive-interrupt
   */
  
  static void ni52_rcv_int(struct net_device *dev)
  {
  	int status, cnt = 0;
  	unsigned short totlen;
  	struct sk_buff *skb;
  	struct rbd_struct __iomem *rbd;
  	struct priv *p = netdev_priv(dev);
  
  	if (debuglevel > 0)
  		printk("R");
  
  	for (; (status = readb(&p->rfd_top->stat_high)) & RFD_COMPL;) {
  		rbd = make32(readw(&p->rfd_top->rbd_offset));
  		if (status & RFD_OK) { /* frame received without error? */
  			totlen = readw(&rbd->status);
  			if (totlen & RBD_LAST) {
  				/* the first and the last buffer? */
  				totlen &= RBD_MASK; /* length of this frame */
  				writew(0x00, &rbd->status);
  				skb = netdev_alloc_skb(dev, totlen + 2);
  				if (skb != NULL) {
  					skb_reserve(skb, 2);
  					skb_put(skb, totlen);
  					memcpy_fromio(skb->data, p->base + readl(&rbd->buffer), totlen);
  					skb->protocol = eth_type_trans(skb, dev);
  					netif_rx(skb);
  					dev->stats.rx_packets++;
  					dev->stats.rx_bytes += totlen;
  				} else
  					dev->stats.rx_dropped++;
  			} else {
  				int rstat;
  				 /* free all RBD's until RBD_LAST is set */
  				totlen = 0;
  				while (!((rstat = readw(&rbd->status)) & RBD_LAST)) {
  					totlen += rstat & RBD_MASK;
  					if (!rstat) {
  						printk(KERN_ERR "%s: Whoops .. no end mark in RBD list\n", dev->name);
  						break;
  					}
  					writew(0, &rbd->status);
  					rbd = make32(readw(&rbd->next));
  				}
  				totlen += rstat & RBD_MASK;
  				writew(0, &rbd->status);
  				printk(KERN_ERR "%s: received oversized frame! length: %d\n",
  					dev->name, totlen);
  				dev->stats.rx_dropped++;
  			 }
  		} else {/* frame !(ok), only with 'save-bad-frames' */
  			printk(KERN_ERR "%s: oops! rfd-error-status: %04x\n",
  				dev->name, status);
  			dev->stats.rx_errors++;
  		}
  		writeb(0, &p->rfd_top->stat_high);
  		writeb(RFD_SUSP, &p->rfd_top->last); /* maybe exchange by RFD_LAST */
  		writew(0xffff, &p->rfd_top->rbd_offset);
  		writeb(0, &p->rfd_last->last);	/* delete RFD_SUSP	*/
  		p->rfd_last = p->rfd_top;
  		p->rfd_top = make32(readw(&p->rfd_top->next)); /* step to next RFD */
  		writew(make16(p->rfd_top), &p->scb->rfa_offset);
  
  		if (debuglevel > 0)
  			printk("%d", cnt++);
  	}
  
  	if (automatic_resume) {
  		wait_for_scb_cmd(dev);
  		writeb(RUC_RESUME, &p->scb->cmd_ruc);
  		ni_attn586();
  		wait_for_scb_cmd_ruc(dev);
  	}
  
  #ifdef WAIT_4_BUSY
  	{
  		int i;
  		for (i = 0; i < 1024; i++) {
  			if (p->rfd_top->status)
  				break;
  			udelay(16);
  			if (i == 1023)
  				printk(KERN_ERR "%s: RU hasn't fetched next RFD (not busy/complete)\n", dev->name);
  		}
  	}
  #endif
  	if (debuglevel > 0)
  		printk("r");
  }
  
  /**********************************************************
   * handle 'Receiver went not ready'.
   */
  
  static void ni52_rnr_int(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  
  	dev->stats.rx_errors++;
  
  	wait_for_scb_cmd(dev);		/* wait for the last cmd, WAIT_4_FULLSTAT?? */
  	writeb(RUC_ABORT, &p->scb->cmd_ruc); /* usually the RU is in the 'no resource'-state .. abort it now. */
  	ni_attn586();
  	wait_for_scb_cmd_ruc(dev);		/* wait for accept cmd. */
  
  	alloc_rfa(dev, p->rfd_first);
  	/* maybe add a check here, before restarting the RU */
  	startrecv586(dev); /* restart RU */
  
  	printk(KERN_ERR "%s: Receive-Unit restarted. Status: %04x\n",
  		dev->name, readb(&p->scb->rus));
  
  }
  
  /**********************************************************
   * handle xmit - interrupt
   */
  
  static void ni52_xmt_int(struct net_device *dev)
  {
  	int status;
  	struct priv *p = netdev_priv(dev);
  
  	if (debuglevel > 0)
  		printk("X");
  
  	status = readw(&p->xmit_cmds[p->xmit_last]->cmd_status);
  	if (!(status & STAT_COMPL))
  		printk(KERN_ERR "%s: strange .. xmit-int without a 'COMPLETE'\n", dev->name);
  
  	if (status & STAT_OK) {
  		dev->stats.tx_packets++;
  		dev->stats.collisions += (status & TCMD_MAXCOLLMASK);
  	} else {
  		dev->stats.tx_errors++;
  		if (status & TCMD_LATECOLL) {
  			printk(KERN_ERR "%s: late collision detected.\n",
  				dev->name);
  			dev->stats.collisions++;
  		} else if (status & TCMD_NOCARRIER) {
  			dev->stats.tx_carrier_errors++;
  			printk(KERN_ERR "%s: no carrier detected.\n",
  				dev->name);
  		} else if (status & TCMD_LOSTCTS)
  			printk(KERN_ERR "%s: loss of CTS detected.\n",
  				dev->name);
  		else if (status & TCMD_UNDERRUN) {
  			dev->stats.tx_fifo_errors++;
  			printk(KERN_ERR "%s: DMA underrun detected.\n",
  				dev->name);
  		} else if (status & TCMD_MAXCOLL) {
  			printk(KERN_ERR "%s: Max. collisions exceeded.\n",
  				dev->name);
  			dev->stats.collisions += 16;
  		}
  	}
  #if (NUM_XMIT_BUFFS > 1)
  	if ((++p->xmit_last) == NUM_XMIT_BUFFS)
  		p->xmit_last = 0;
  #endif
  	netif_wake_queue(dev);
  }
  
  /***********************************************************
   * (re)start the receiver
   */
  
  static void startrecv586(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  
  	wait_for_scb_cmd(dev);
  	wait_for_scb_cmd_ruc(dev);
  	writew(make16(p->rfd_first), &p->scb->rfa_offset);
  	writeb(RUC_START, &p->scb->cmd_ruc);
  	ni_attn586();		/* start cmd. */
  	wait_for_scb_cmd_ruc(dev);
  	/* wait for accept cmd. (no timeout!!) */
  }
  
  static void ni52_timeout(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  #ifndef NO_NOPCOMMANDS
  	if (readb(&p->scb->cus) & CU_ACTIVE) { /* COMMAND-UNIT active? */
  		netif_wake_queue(dev);
  #ifdef DEBUG
  		printk(KERN_ERR "%s: strange ... timeout with CU active?!?\n",
  			dev->name);
  		printk(KERN_ERR "%s: X0: %04x N0: %04x N1: %04x %d\n",
  			dev->name, (int)p->xmit_cmds[0]->cmd_status,
  			readw(&p->nop_cmds[0]->cmd_status),
  			readw(&p->nop_cmds[1]->cmd_status),
  			p->nop_point);
  #endif
  		writeb(CUC_ABORT, &p->scb->cmd_cuc);
  		ni_attn586();
  		wait_for_scb_cmd(dev);
  		writew(make16(p->nop_cmds[p->nop_point]), &p->scb->cbl_offset);
  		writeb(CUC_START, &p->scb->cmd_cuc);
  		ni_attn586();
  		wait_for_scb_cmd(dev);
  		dev->trans_start = jiffies; /* prevent tx timeout */
  		return 0;
  	}
  #endif
  	{
  #ifdef DEBUG
  		printk(KERN_ERR "%s: xmitter timed out, try to restart! stat: %02x\n",
  				dev->name, readb(&p->scb->cus));
  		printk(KERN_ERR "%s: command-stats: %04x %04x\n",
  				dev->name,
  				readw(&p->xmit_cmds[0]->cmd_status),
  				readw(&p->xmit_cmds[1]->cmd_status));
  		printk(KERN_ERR "%s: check, whether you set the right interrupt number!\n",
  				dev->name);
  #endif
  		ni52_close(dev);
  		ni52_open(dev);
  	}
  	dev->trans_start = jiffies; /* prevent tx timeout */
  }
  
  /******************************************************
   * send frame
   */
  
  static netdev_tx_t ni52_send_packet(struct sk_buff *skb,
  				    struct net_device *dev)
  {
  	int len, i;
  #ifndef NO_NOPCOMMANDS
  	int next_nop;
  #endif
  	struct priv *p = netdev_priv(dev);
  
  	if (skb->len > XMIT_BUFF_SIZE) {
  		printk(KERN_ERR "%s: Sorry, max. framelength is %d bytes. The length of your frame is %d bytes.\n", dev->name, XMIT_BUFF_SIZE, skb->len);
  		return NETDEV_TX_OK;
  	}
  
  	netif_stop_queue(dev);
  
  	memcpy_toio(p->xmit_cbuffs[p->xmit_count], skb->data, skb->len);
  	len = skb->len;
  	if (len < ETH_ZLEN) {
  		len = ETH_ZLEN;
  		memset_io(p->xmit_cbuffs[p->xmit_count]+skb->len, 0,
  							len - skb->len);
  	}
  
  #if (NUM_XMIT_BUFFS == 1)
  #	ifdef NO_NOPCOMMANDS
  
  #ifdef DEBUG
  	if (readb(&p->scb->cus) & CU_ACTIVE) {
  		printk(KERN_ERR "%s: Hmmm .. CU is still running and we wanna send a new packet.\n", dev->name);
  		printk(KERN_ERR "%s: stat: %04x %04x\n",
  				dev->name, readb(&p->scb->cus),
  				readw(&p->xmit_cmds[0]->cmd_status));
  	}
  #endif
  	writew(TBD_LAST | len, &p->xmit_buffs[0]->size);
  	for (i = 0; i < 16; i++) {
  		writew(0, &p->xmit_cmds[0]->cmd_status);
  		wait_for_scb_cmd(dev);
  		if ((readb(&p->scb->cus) & CU_STATUS) == CU_SUSPEND)
  			writeb(CUC_RESUME, &p->scb->cmd_cuc);
  		else {
  			writew(make16(p->xmit_cmds[0]), &p->scb->cbl_offset);
  			writeb(CUC_START, &p->scb->cmd_cuc);
  		}
  		ni_attn586();
  		if (!i)
  			dev_kfree_skb(skb);
  		wait_for_scb_cmd(dev);
  		/* test it, because CU sometimes doesn't start immediately */
  		if (readb(&p->scb->cus) & CU_ACTIVE)
  			break;
  		if (readw(&p->xmit_cmds[0]->cmd_status))
  			break;
  		if (i == 15)
  			printk(KERN_WARNING "%s: Can't start transmit-command.\n", dev->name);
  	}
  #	else
  	next_nop = (p->nop_point + 1) & 0x1;
  	writew(TBD_LAST | len, &p->xmit_buffs[0]->size);
  	writew(make16(p->nop_cmds[next_nop]), &p->xmit_cmds[0]->cmd_link);
  	writew(make16(p->nop_cmds[next_nop]),
  				&p->nop_cmds[next_nop]->cmd_link);
  	writew(0, &p->xmit_cmds[0]->cmd_status);
  	writew(0, &p->nop_cmds[next_nop]->cmd_status);
  
  	writew(make16(p->xmit_cmds[0]), &p->nop_cmds[p->nop_point]->cmd_link);
  	p->nop_point = next_nop;
  	dev_kfree_skb(skb);
  #	endif
  #else
  	writew(TBD_LAST | len, &p->xmit_buffs[p->xmit_count]->size);
  	next_nop = p->xmit_count + 1
  	if (next_nop == NUM_XMIT_BUFFS)
  		next_nop = 0;
  	writew(0, &p->xmit_cmds[p->xmit_count]->cmd_status);
  	/* linkpointer of xmit-command already points to next nop cmd */
  	writew(make16(p->nop_cmds[next_nop]),
  				&p->nop_cmds[next_nop]->cmd_link);
  	writew(0, &p->nop_cmds[next_nop]->cmd_status);
  	writew(make16(p->xmit_cmds[p->xmit_count]),
  				&p->nop_cmds[p->xmit_count]->cmd_link);
  	p->xmit_count = next_nop;
  	{
  		unsigned long flags;
  		spin_lock_irqsave(&p->spinlock);
  		if (p->xmit_count != p->xmit_last)
  			netif_wake_queue(dev);
  		spin_unlock_irqrestore(&p->spinlock);
  	}
  	dev_kfree_skb(skb);
  #endif
  	return NETDEV_TX_OK;
  }
  
  /*******************************************
   * Someone wanna have the statistics
   */
  
  static struct net_device_stats *ni52_get_stats(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  	unsigned short crc, aln, rsc, ovrn;
  
  	/* Get error-statistics from the ni82586 */
  	crc = readw(&p->scb->crc_errs);
  	writew(0, &p->scb->crc_errs);
  	aln = readw(&p->scb->aln_errs);
  	writew(0, &p->scb->aln_errs);
  	rsc = readw(&p->scb->rsc_errs);
  	writew(0, &p->scb->rsc_errs);
  	ovrn = readw(&p->scb->ovrn_errs);
  	writew(0, &p->scb->ovrn_errs);
  
  	dev->stats.rx_crc_errors += crc;
  	dev->stats.rx_fifo_errors += ovrn;
  	dev->stats.rx_frame_errors += aln;
  	dev->stats.rx_dropped += rsc;
  
  	return &dev->stats;
  }
  
  /********************************************************
   * Set MC list ..
   */
  
  static void set_multicast_list(struct net_device *dev)
  {
  	netif_stop_queue(dev);
  	ni_disint();
  	alloc586(dev);
  	init586(dev);
  	startrecv586(dev);
  	ni_enaint();
  	netif_wake_queue(dev);
  }
  
  #ifdef MODULE
  static struct net_device *dev_ni52;
  
  module_param(io, int, 0);
  module_param(irq, int, 0);
  module_param(memstart, long, 0);
  module_param(memend, long, 0);
  MODULE_PARM_DESC(io, "NI5210 I/O base address,required");
  MODULE_PARM_DESC(irq, "NI5210 IRQ number,required");
  MODULE_PARM_DESC(memstart, "NI5210 memory base address,required");
  MODULE_PARM_DESC(memend, "NI5210 memory end address,required");
  
  int __init init_module(void)
  {
  	if (io <= 0x0 || !memend || !memstart || irq < 2) {
  		printk(KERN_ERR "ni52: Autoprobing not allowed for modules.\n");
  		printk(KERN_ERR "ni52: Set symbols 'io' 'irq' 'memstart' and 'memend'\n");
  		return -ENODEV;
  	}
  	dev_ni52 = ni52_probe(-1);
  	if (IS_ERR(dev_ni52))
  		return PTR_ERR(dev_ni52);
  	return 0;
  }
  
  void __exit cleanup_module(void)
  {
  	struct priv *p = netdev_priv(dev_ni52);
  	unregister_netdev(dev_ni52);
  	iounmap(p->mapped);
  	release_region(dev_ni52->base_addr, NI52_TOTAL_SIZE);
  	free_netdev(dev_ni52);
  }
  #endif /* MODULE */
  
  MODULE_LICENSE("GPL");
  