text: /*
   * ni6510 (am7990 'lance' chip) driver for Linux-net-3
   * BETAcode v0.71 (96/09/29) for 2.0.0 (or later)
   * copyrights (c) 1994,1995,1996 by M.Hipp
   *
   * This driver can handle the old ni6510 board and the newer ni6510
   * EtherBlaster. (probably it also works with every full NE2100
   * compatible card)
   *
   * To compile as module, type:
   *     gcc -O2 -fomit-frame-pointer -m486 -D__KERNEL__ -DMODULE -c ni65.c
   * driver probes: io: 0x360,0x300,0x320,0x340 / dma: 3,5,6,7
   *
   * This is an extension to the Linux operating system, and is covered by the
   * same GNU General Public License that covers the Linux-kernel.
   *
   * comments/bugs/suggestions can be sent to:
   *   Michael Hipp
   *   email: hippm@informatik.uni-tuebingen.de
   *
   * sources:
   *   some things are from the 'ni6510-packet-driver for dos by Russ Nelson'
   *   and from the original drivers by D.Becker
   *
   * known problems:
   *   - on some PCI boards (including my own) the card/board/ISA-bridge has
   *     problems with bus master DMA. This results in lotsa overruns.
   *     It may help to '#define RCV_PARANOIA_CHECK' or try to #undef
   *     the XMT and RCV_VIA_SKB option .. this reduces driver performance.
   *     Or just play with your BIOS options to optimize ISA-DMA access.
   *     Maybe you also wanna play with the LOW_PERFORAMCE and MID_PERFORMANCE
   *     defines -> please report me your experience then
   *   - Harald reported for ASUS SP3G mainboards, that you should use
   *     the 'optimal settings' from the user's manual on page 3-12!
   *
   * credits:
   *   thanx to Jason Sullivan for sending me a ni6510 card!
   *   lot of debug runs with ASUS SP3G Boards (Intel Saturn) by Harald Koenig
   *
   * simple performance test: (486DX-33/Ni6510-EB receives from 486DX4-100/Ni6510-EB)
   *    average: FTP -> 8384421 bytes received in 8.5 seconds
   *           (no RCV_VIA_SKB,no XMT_VIA_SKB,PARANOIA_CHECK,4 XMIT BUFS, 8 RCV_BUFFS)
   *    peak: FTP -> 8384421 bytes received in 7.5 seconds
   *           (RCV_VIA_SKB,XMT_VIA_SKB,no PARANOIA_CHECK,1(!) XMIT BUF, 16 RCV BUFFS)
   */
  
  /*
   * 99.Jun.8: added support for /proc/net/dev byte count for xosview (HK)
   * 96.Sept.29: virt_to_bus stuff added for new memory modell
   * 96.April.29: Added Harald Koenig's Patches (MH)
   * 96.April.13: enhanced error handling .. more tests (MH)
   * 96.April.5/6: a lot of performance tests. Got it stable now (hopefully) (MH)
   * 96.April.1: (no joke ;) .. added EtherBlaster and Module support (MH)
   * 96.Feb.19: fixed a few bugs .. cleanups .. tested for 1.3.66 (MH)
   *            hopefully no more 16MB limit
   *
   * 95.Nov.18: multicast tweaked (AC).
   *
   * 94.Aug.22: changes in xmit_intr (ack more than one xmitted-packet), ni65_send_packet (p->lock) (MH)
   *
   * 94.July.16: fixed bugs in recv_skb and skb-alloc stuff  (MH)
   */
  
  #include <linux/kernel.h>
  #include <linux/string.h>
  #include <linux/errno.h>
  #include <linux/ioport.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>
  #include <linux/delay.h>
  #include <linux/init.h>
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  #include <linux/module.h>
  
  #include <asm/bitops.h>
  #include <asm/io.h>
  #include <asm/dma.h>
  
  #include "ni65.h"
  
  /*
   * the current setting allows an acceptable performance
   * for 'RCV_PARANOIA_CHECK' read the 'known problems' part in
   * the header of this file
   * 'invert' the defines for max. performance. This may cause DMA problems
   * on some boards (e.g on my ASUS SP3G)
   */
  #undef XMT_VIA_SKB
  #undef RCV_VIA_SKB
  #define RCV_PARANOIA_CHECK
  
  #define MID_PERFORMANCE
  
  #if   defined( LOW_PERFORMANCE )
   static int isa0=7,isa1=7,csr80=0x0c10;
  #elif defined( MID_PERFORMANCE )
   static int isa0=5,isa1=5,csr80=0x2810;
  #else	/* high performance */
   static int isa0=4,isa1=4,csr80=0x0017;
  #endif
  
  /*
   * a few card/vendor specific defines
   */
  #define NI65_ID0    0x00
  #define NI65_ID1    0x55
  #define NI65_EB_ID0 0x52
  #define NI65_EB_ID1 0x44
  #define NE2100_ID0  0x57
  #define NE2100_ID1  0x57
  
  #define PORT p->cmdr_addr
  
  /*
   * buffer configuration
   */
  #if 1
  #define RMDNUM 16
  #define RMDNUMMASK 0x80000000
  #else
  #define RMDNUM 8
  #define RMDNUMMASK 0x60000000 /* log2(RMDNUM)<<29 */
  #endif
  
  #if 0
  #define TMDNUM 1
  #define TMDNUMMASK 0x00000000
  #else
  #define TMDNUM 4
  #define TMDNUMMASK 0x40000000 /* log2(TMDNUM)<<29 */
  #endif
  
  /* slightly oversized */
  #define R_BUF_SIZE 1544
  #define T_BUF_SIZE 1544
  
  /*
   * lance register defines
   */
  #define L_DATAREG 0x00
  #define L_ADDRREG 0x02
  #define L_RESET   0x04
  #define L_CONFIG  0x05
  #define L_BUSIF   0x06
  
  /*
   * to access the lance/am7990-regs, you have to write
   * reg-number into L_ADDRREG, then you can access it using L_DATAREG
   */
  #define CSR0  0x00
  #define CSR1  0x01
  #define CSR2  0x02
  #define CSR3  0x03
  
  #define INIT_RING_BEFORE_START	0x1
  #define FULL_RESET_ON_ERROR	0x2
  
  #if 0
  #define writereg(val,reg) {outw(reg,PORT+L_ADDRREG);inw(PORT+L_ADDRREG); \
                             outw(val,PORT+L_DATAREG);inw(PORT+L_DATAREG);}
  #define readreg(reg) (outw(reg,PORT+L_ADDRREG),inw(PORT+L_ADDRREG),\
                         inw(PORT+L_DATAREG))
  #if 0
  #define writedatareg(val) {outw(val,PORT+L_DATAREG);inw(PORT+L_DATAREG);}
  #else
  #define writedatareg(val) {  writereg(val,CSR0); }
  #endif
  #else
  #define writereg(val,reg) {outw(reg,PORT+L_ADDRREG);outw(val,PORT+L_DATAREG);}
  #define readreg(reg) (outw(reg,PORT+L_ADDRREG),inw(PORT+L_DATAREG))
  #define writedatareg(val) { writereg(val,CSR0); }
  #endif
  
  static unsigned char ni_vendor[] = { 0x02,0x07,0x01 };
  
  static struct card {
  	unsigned char id0,id1;
  	short id_offset;
  	short total_size;
  	short cmd_offset;
  	short addr_offset;
  	unsigned char *vendor_id;
  	char *cardname;
  	long config;
  } cards[] = {
  	{
  		.id0	     = NI65_ID0,
  		.id1	     = NI65_ID1,
  		.id_offset   = 0x0e,
  		.total_size  = 0x10,
  		.cmd_offset  = 0x0,
  		.addr_offset = 0x8,
  		.vendor_id   = ni_vendor,
  		.cardname    = "ni6510",
  		.config	     = 0x1,
         	},
  	{
  		.id0	     = NI65_EB_ID0,
  		.id1	     = NI65_EB_ID1,
  		.id_offset   = 0x0e,
  		.total_size  = 0x18,
  		.cmd_offset  = 0x10,
  		.addr_offset = 0x0,
  		.vendor_id   = ni_vendor,
  		.cardname    = "ni6510 EtherBlaster",
  		.config	     = 0x2,
         	},
  	{
  		.id0	     = NE2100_ID0,
  		.id1	     = NE2100_ID1,
  		.id_offset   = 0x0e,
  		.total_size  = 0x18,
  		.cmd_offset  = 0x10,
  		.addr_offset = 0x0,
  		.vendor_id   = NULL,
  		.cardname    = "generic NE2100",
  		.config	     = 0x0,
  	},
  };
  #define NUM_CARDS 3
  
  struct priv
  {
  	struct rmd rmdhead[RMDNUM];
  	struct tmd tmdhead[TMDNUM];
  	struct init_block ib;
  	int rmdnum;
  	int tmdnum,tmdlast;
  #ifdef RCV_VIA_SKB
  	struct sk_buff *recv_skb[RMDNUM];
  #else
  	void *recvbounce[RMDNUM];
  #endif
  #ifdef XMT_VIA_SKB
  	struct sk_buff *tmd_skb[TMDNUM];
  #endif
  	void *tmdbounce[TMDNUM];
  	int tmdbouncenum;
  	int lock,xmit_queued;
  	struct net_device_stats stats;
  	void *self;
  	int cmdr_addr;
  	int cardno;
  	int features;
  	spinlock_t ring_lock;
  };
  
  static int  ni65_probe1(struct net_device *dev,int);
  static irqreturn_t ni65_interrupt(int irq, void * dev_id, struct pt_regs *regs);
  static void ni65_recv_intr(struct net_device *dev,int);
  static void ni65_xmit_intr(struct net_device *dev,int);
  static int  ni65_open(struct net_device *dev);
  static int  ni65_lance_reinit(struct net_device *dev);
  static void ni65_init_lance(struct priv *p,unsigned char*,int,int);
  static int  ni65_send_packet(struct sk_buff *skb, struct net_device *dev);
  static void  ni65_timeout(struct net_device *dev);
  static int  ni65_close(struct net_device *dev);
  static int  ni65_alloc_buffer(struct net_device *dev);
  static void ni65_free_buffer(struct priv *p);
  static struct net_device_stats *ni65_get_stats(struct net_device *);
  static void set_multicast_list(struct net_device *dev);
  
  static int irqtab[] __initdata = { 9,12,15,5 }; /* irq config-translate */
  static int dmatab[] __initdata = { 0,3,5,6,7 }; /* dma config-translate and autodetect */
  
  static int debuglevel = 1;
  
  /*
   * set 'performance' registers .. we must STOP lance for that
   */
  static void ni65_set_performance(struct priv *p)
  {
  	writereg(CSR0_STOP | CSR0_CLRALL,CSR0); /* STOP */
  
  	if( !(cards[p->cardno].config & 0x02) )
  		return;
  
  	outw(80,PORT+L_ADDRREG);
  	if(inw(PORT+L_ADDRREG) != 80)
  		return;
  
  	writereg( (csr80 & 0x3fff) ,80); /* FIFO watermarks */
  	outw(0,PORT+L_ADDRREG);
  	outw((short)isa0,PORT+L_BUSIF); /* write ISA 0: DMA_R : isa0 * 50ns */
  	outw(1,PORT+L_ADDRREG);
  	outw((short)isa1,PORT+L_BUSIF); /* write ISA 1: DMA_W : isa1 * 50ns	*/
  
  	outw(CSR0,PORT+L_ADDRREG);	/* switch back to CSR0 */
  }
  
  /*
   * open interface (up)
   */
  static int ni65_open(struct net_device *dev)
  {
  	struct priv *p = (struct priv *) dev->priv;
  	int irqval = request_irq(dev->irq, &ni65_interrupt,0,
                          cards[p->cardno].cardname,dev);
  	if (irqval) {
  		printk(KERN_ERR "%s: unable to get IRQ %d (irqval=%d).\n",
  		          dev->name,dev->irq, irqval);
  		return -EAGAIN;
  	}
  
  	if(ni65_lance_reinit(dev))
  	{
  		netif_start_queue(dev);
  		return 0;
  	}
  	else
  	{
  		free_irq(dev->irq,dev);
  		return -EAGAIN;
  	}
  }
  
  /*
   * close interface (down)
   */
  static int ni65_close(struct net_device *dev)
  {
  	struct priv *p = (struct priv *) dev->priv;
  
  	netif_stop_queue(dev);
  	
  	outw(inw(PORT+L_RESET),PORT+L_RESET); /* that's the hard way */
  
  #ifdef XMT_VIA_SKB
  	{
  		int i;
  		for(i=0;i<TMDNUM;i++)
  		{
  			if(p->tmd_skb[i]) {
  				dev_kfree_skb(p->tmd_skb[i]);
  				p->tmd_skb[i] = NULL;
  			}
  		}
  	}
  #endif
  	free_irq(dev->irq,dev);
  	return 0;
  }
  
  /*
   * Probe The Card (not the lance-chip)
   */
  #ifdef MODULE
  static
  #endif
  int __init ni65_probe(struct net_device *dev)
  {
  	int *port;
  	static int ports[] = {0x360,0x300,0x320,0x340, 0};
  
  	if (dev->base_addr > 0x1ff)          /* Check a single specified location. */
  		 return ni65_probe1(dev, dev->base_addr);
  	else if (dev->base_addr > 0)         /* Don't probe at all. */
  		 return -ENXIO;
  
  	for (port = ports; *port; port++)
  	{
  		if (ni65_probe1(dev, *port) == 0)
  			 return 0;
  	}
  
  	return -ENODEV;
  }
  
  /*
   * this is the real card probe ..
   */
  static int __init ni65_probe1(struct net_device *dev,int ioaddr)
  {
  	int i,j;
  	struct priv *p;
  	unsigned long flags;
  
  	for(i=0;i<NUM_CARDS;i++) {
  		if(!request_region(ioaddr, cards[i].total_size, cards[i].cardname))
  			continue;
  		if(cards[i].id_offset >= 0) {
  			if(inb(ioaddr+cards[i].id_offset+0) != cards[i].id0 ||
  				 inb(ioaddr+cards[i].id_offset+1) != cards[i].id1) {
  				 release_region(ioaddr, cards[i].total_size);
  				 continue;
  			}
  		}
  		if(cards[i].vendor_id) {
  			for(j=0;j<3;j++)
  				if(inb(ioaddr+cards[i].addr_offset+j) != cards[i].vendor_id[j]) {
  					release_region(ioaddr, cards[i].total_size);
  					continue;
  			  }
  		}
  		break;
  	}
  	if(i == NUM_CARDS)
  		return -ENODEV;
  
  	for(j=0;j<6;j++)
  		dev->dev_addr[j] = inb(ioaddr+cards[i].addr_offset+j);
  
  	if( (j=ni65_alloc_buffer(dev)) < 0) {
  		release_region(ioaddr, cards[i].total_size);
  		return j;
  	}
  	p = (struct priv *) dev->priv;
  	p->cmdr_addr = ioaddr + cards[i].cmd_offset;
  	p->cardno = i;
  	spin_lock_init(&p->ring_lock);
  
  	printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cards[p->cardno].cardname , ioaddr);
  
  	outw(inw(PORT+L_RESET),PORT+L_RESET); /* first: reset the card */
  	if( (j=readreg(CSR0)) != 0x4) {
  		 printk("failed.\n");
  		 printk(KERN_ERR "%s: Can't RESET card: %04x\n", dev->name, j);
  		 ni65_free_buffer(p);
  		 release_region(ioaddr, cards[p->cardno].total_size);
  		 return -EAGAIN;
  	}
  
  	outw(88,PORT+L_ADDRREG);
  	if(inw(PORT+L_ADDRREG) == 88) {
  		unsigned long v;
  		v = inw(PORT+L_DATAREG);
  		v <<= 16;
  		outw(89,PORT+L_ADDRREG);
  		v |= inw(PORT+L_DATAREG);
  		printk("Version %#08lx, ",v);
  		p->features = INIT_RING_BEFORE_START;
  	}
  	else {
  		printk("ancient LANCE, ");
  		p->features = 0x0;
  	}
  
  	if(test_bit(0,&cards[i].config)) {
  		dev->irq = irqtab[(inw(ioaddr+L_CONFIG)>>2)&3];
  		dev->dma = dmatab[inw(ioaddr+L_CONFIG)&3];
  		printk("IRQ %d (from card), DMA %d (from card).\n",dev->irq,dev->dma);
  	}
  	else {
  		if(dev->dma == 0) {
  		/* 'stuck test' from lance.c */
  			long dma_channels = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
  					    (inb(DMA2_STAT_REG) & 0xf0);
  			for(i=1;i<5;i++) {
  				int dma = dmatab[i];
  				if(test_bit(dma,&dma_channels) || request_dma(dma,"ni6510"))
  					continue;
  					
  				flags=claim_dma_lock();
  				disable_dma(dma);
  				set_dma_mode(dma,DMA_MODE_CASCADE);
  				enable_dma(dma);
  				release_dma_lock(flags);
  				
  				ni65_init_lance(p,dev->dev_addr,0,0); /* trigger memory access */
  				
  				flags=claim_dma_lock();
  				disable_dma(dma);
  				free_dma(dma);
  				release_dma_lock(flags);
  				
  				if(readreg(CSR0) & CSR0_IDON)
  					break;
  			}
  			if(i == 5) {
  				printk("failed.\n");
  				printk(KERN_ERR "%s: Can't detect DMA channel!\n", dev->name);
  				ni65_free_buffer(p);
  				release_region(ioaddr, cards[p->cardno].total_size);
  				return -EAGAIN;
  			}
  			dev->dma = dmatab[i];
  			printk("DMA %d (autodetected), ",dev->dma);
  		}
  		else
  			printk("DMA %d (assigned), ",dev->dma);
  
  		if(dev->irq < 2)
  		{
  			unsigned long irq_mask;
  
  			ni65_init_lance(p,dev->dev_addr,0,0);
  			irq_mask = probe_irq_on();
  			writereg(CSR0_INIT|CSR0_INEA,CSR0); /* trigger interrupt */
  			set_current_state(TASK_UNINTERRUPTIBLE);
  			schedule_timeout(HZ/50);
  			dev->irq = probe_irq_off(irq_mask);
  			if(!dev->irq)
  			{
  				printk("Failed to detect IRQ line!\n");
  				ni65_free_buffer(p);
  				release_region(ioaddr, cards[p->cardno].total_size);
  				return -EAGAIN;
  			}
  			printk("IRQ %d (autodetected).\n",dev->irq);
  		}
  		else
  			printk("IRQ %d (assigned).\n",dev->irq);
  	}
  
  	if(request_dma(dev->dma, cards[p->cardno].cardname ) != 0)
  	{
  		printk(KERN_ERR "%s: Can't request dma-channel %d\n",dev->name,(int) dev->dma);
  		ni65_free_buffer(p);
  		release_region(ioaddr, cards[p->cardno].total_size);
  		return -EAGAIN;
  	}
  
  	dev->base_addr = ioaddr;
  	SET_MODULE_OWNER(dev);
  	dev->open		= ni65_open;
  	dev->stop		= ni65_close;
  	dev->hard_start_xmit	= ni65_send_packet;
  	dev->tx_timeout		= ni65_timeout;
  	dev->watchdog_timeo	= HZ/2;
  	dev->get_stats		= ni65_get_stats;
  	dev->set_multicast_list = set_multicast_list;
  
  	ether_setup(dev);
  
  	return 0; /* everything is OK */
  }
  
  /*
   * set lance register and trigger init
   */
  static void ni65_init_lance(struct priv *p,unsigned char *daddr,int filter,int mode)
  {
  	int i;
  	u32 pib;
  
  	writereg(CSR0_CLRALL|CSR0_STOP,CSR0);
  
  	for(i=0;i<6;i++)
  		p->ib.eaddr[i] = daddr[i];
  
  	for(i=0;i<8;i++)
  		p->ib.filter[i] = filter;
  	p->ib.mode = mode;
  
  	p->ib.trp = (u32) isa_virt_to_bus(p->tmdhead) | TMDNUMMASK;
  	p->ib.rrp = (u32) isa_virt_to_bus(p->rmdhead) | RMDNUMMASK;
  	writereg(0,CSR3);	/* busmaster/no word-swap */
  	pib = (u32) isa_virt_to_bus(&p->ib);
  	writereg(pib & 0xffff,CSR1);
  	writereg(pib >> 16,CSR2);
  
  	writereg(CSR0_INIT,CSR0); /* this changes L_ADDRREG to CSR0 */
  
  	for(i=0;i<32;i++)
  	{
  		mdelay(4);
  		if(inw(PORT+L_DATAREG) & (CSR0_IDON | CSR0_MERR) )
  			break; /* init ok ? */
  	}
  }
  
  /*
   * allocate memory area and check the 16MB border
   */
  static void *ni65_alloc_mem(struct net_device *dev,char *what,int size,int type)
  {
  	struct sk_buff *skb=NULL;
  	unsigned char *ptr;
  	void *ret;
  
  	if(type) {
  		ret = skb = alloc_skb(2+16+size,GFP_KERNEL|GFP_DMA);
  		if(!skb) {
  			printk(KERN_WARNING "%s: unable to allocate %s memory.\n",dev->name,what);
  			return NULL;
  		}
  		skb->dev = dev;
  		skb_reserve(skb,2+16);
  		skb_put(skb,R_BUF_SIZE);	 /* grab the whole space .. (not necessary) */
  		ptr = skb->data;
  	}
  	else {
  		ret = ptr = kmalloc(T_BUF_SIZE,GFP_KERNEL | GFP_DMA);
  		if(!ret) {
  			printk(KERN_WARNING "%s: unable to allocate %s memory.\n",dev->name,what);
  			return NULL;
  		}
  	}
  	if( (u32) virt_to_phys(ptr+size) > 0x1000000) {
  		printk(KERN_WARNING "%s: unable to allocate %s memory in lower 16MB!\n",dev->name,what);
  		if(type)
  			kfree_skb(skb);
  		else
  			kfree(ptr);
  		return NULL;
  	}
  	return ret;
  }
  
  /*
   * allocate all memory structures .. send/recv buffers etc ...
   */
  static int ni65_alloc_buffer(struct net_device *dev)
  {
  	unsigned char *ptr;
  	struct priv *p;
  	int i;
  
  	/*
  	 * we need 8-aligned memory ..
  	 */
  	ptr = ni65_alloc_mem(dev,"BUFFER",sizeof(struct priv)+8,0);
  	if(!ptr)
  		return -ENOMEM;
  
  	p = dev->priv = (struct priv *) (((unsigned long) ptr + 7) & ~0x7);
  	memset((char *) dev->priv,0,sizeof(struct priv));
  	p->self = ptr;
  
  	for(i=0;i<TMDNUM;i++)
  	{
  #ifdef XMT_VIA_SKB
  		p->tmd_skb[i] = NULL;
  #endif
  		p->tmdbounce[i] = ni65_alloc_mem(dev,"XMIT",T_BUF_SIZE,0);
  		if(!p->tmdbounce[i]) {
  			ni65_free_buffer(p);
  			return -ENOMEM;
  		}
  	}
  
  	for(i=0;i<RMDNUM;i++)
  	{
  #ifdef RCV_VIA_SKB
  		p->recv_skb[i] = ni65_alloc_mem(dev,"RECV",R_BUF_SIZE,1);
  		if(!p->recv_skb[i]) {
  			ni65_free_buffer(p);
  			return -ENOMEM;
  		}
  #else
  		p->recvbounce[i] = ni65_alloc_mem(dev,"RECV",R_BUF_SIZE,0);
  		if(!p->recvbounce[i]) {
  			ni65_free_buffer(p);
  			return -ENOMEM;
  		}
  #endif
  	}
  
  	return 0; /* everything is OK */
  }
  
  /*
   * free buffers and private struct
   */
  static void ni65_free_buffer(struct priv *p)
  {
  	int i;
  
  	if(!p)
  		return;
  
  	for(i=0;i<TMDNUM;i++) {
  		if(p->tmdbounce[i])
  			kfree(p->tmdbounce[i]);
  #ifdef XMT_VIA_SKB
  		if(p->tmd_skb[i])
  			dev_kfree_skb(p->tmd_skb[i]);
  #endif
  	}
  
  	for(i=0;i<RMDNUM;i++)
  	{
  #ifdef RCV_VIA_SKB
  		if(p->recv_skb[i])
  			dev_kfree_skb(p->recv_skb[i]);
  #else
  		if(p->recvbounce[i])
  			kfree(p->recvbounce[i]);
  #endif
  	}
  	if(p->self)
  		kfree(p->self);
  }
  
  
  /*
   * stop and (re)start lance .. e.g after an error
   */
  static void ni65_stop_start(struct net_device *dev,struct priv *p)
  {
  	int csr0 = CSR0_INEA;
  
  	writedatareg(CSR0_STOP);
  
  	if(debuglevel > 1)
  		printk(KERN_DEBUG "ni65_stop_start\n");
  
  	if(p->features & INIT_RING_BEFORE_START) {
  		int i;
  #ifdef XMT_VIA_SKB
  		struct sk_buff *skb_save[TMDNUM];
  #endif
  		unsigned long buffer[TMDNUM];
  		short blen[TMDNUM];
  
  		if(p->xmit_queued) {
  			while(1) {
  				if((p->tmdhead[p->tmdlast].u.s.status & XMIT_OWN))
  					break;
  				p->tmdlast = (p->tmdlast + 1) & (TMDNUM-1);
  				if(p->tmdlast == p->tmdnum)
  					break;
  			}
  		}
  
  		for(i=0;i<TMDNUM;i++) {
  			struct tmd *tmdp = p->tmdhead + i;
  #ifdef XMT_VIA_SKB
  			skb_save[i] = p->tmd_skb[i];
  #endif
  			buffer[i] = (u32) isa_bus_to_virt(tmdp->u.buffer);
  			blen[i] = tmdp->blen;
  			tmdp->u.s.status = 0x0;
  		}
  
  		for(i=0;i<RMDNUM;i++) {
  			struct rmd *rmdp = p->rmdhead + i;
  			rmdp->u.s.status = RCV_OWN;
  		}
  		p->tmdnum = p->xmit_queued = 0;
  		writedatareg(CSR0_STRT | csr0);
  
  		for(i=0;i<TMDNUM;i++) {
  			int num = (i + p->tmdlast) & (TMDNUM-1);
  			p->tmdhead[i].u.buffer = (u32) isa_virt_to_bus((char *)buffer[num]); /* status is part of buffer field */
  			p->tmdhead[i].blen = blen[num];
  			if(p->tmdhead[i].u.s.status & XMIT_OWN) {
  				 p->tmdnum = (p->tmdnum + 1) & (TMDNUM-1);
  				 p->xmit_queued = 1;
  	 writedatareg(CSR0_TDMD | CSR0_INEA | csr0);
  			}
  #ifdef XMT_VIA_SKB
  			p->tmd_skb[i] = skb_save[num];
  #endif
  		}
  		p->rmdnum = p->tmdlast = 0;
  		if(!p->lock)
  			if (p->tmdnum || !p->xmit_queued)
  				netif_wake_queue(dev);
  		dev->trans_start = jiffies;
  	}
  	else
  		writedatareg(CSR0_STRT | csr0);
  }
  
  /*
   * init lance (write init-values .. init-buffers) (open-helper)
   */
  static int ni65_lance_reinit(struct net_device *dev)
  {
  	 int i;
  	 struct priv *p = (struct priv *) dev->priv;
  	 unsigned long flags;
  
  	 p->lock = 0;
  	 p->xmit_queued = 0;
  
  	 flags=claim_dma_lock();
  	 disable_dma(dev->dma); /* I've never worked with dma, but we do it like the packetdriver */
  	 set_dma_mode(dev->dma,DMA_MODE_CASCADE);
  	 enable_dma(dev->dma);
  	 release_dma_lock(flags);
  
  	 outw(inw(PORT+L_RESET),PORT+L_RESET); /* first: reset the card */
  	 if( (i=readreg(CSR0) ) != 0x4)
  	 {
  		 printk(KERN_ERR "%s: can't RESET %s card: %04x\n",dev->name,
  							cards[p->cardno].cardname,(int) i);
  		 flags=claim_dma_lock();
  		 disable_dma(dev->dma);
  		 release_dma_lock(flags);
  		 return 0;
  	 }
  
  	 p->rmdnum = p->tmdnum = p->tmdlast = p->tmdbouncenum = 0;
  	 for(i=0;i<TMDNUM;i++)
  	 {
  		 struct tmd *tmdp = p->tmdhead + i;
  #ifdef XMT_VIA_SKB
  		 if(p->tmd_skb[i]) {
  			 dev_kfree_skb(p->tmd_skb[i]);
  			 p->tmd_skb[i] = NULL;
  		 }
  #endif
  		 tmdp->u.buffer = 0x0;
  		 tmdp->u.s.status = XMIT_START | XMIT_END;
  		 tmdp->blen = tmdp->status2 = 0;
  	 }
  
  	 for(i=0;i<RMDNUM;i++)
  	 {
  		 struct rmd *rmdp = p->rmdhead + i;
  #ifdef RCV_VIA_SKB
  		 rmdp->u.buffer = (u32) isa_virt_to_bus(p->recv_skb[i]->data);
  #else
  		 rmdp->u.buffer = (u32) isa_virt_to_bus(p->recvbounce[i]);
  #endif
  		 rmdp->blen = -(R_BUF_SIZE-8);
  		 rmdp->mlen = 0;
  		 rmdp->u.s.status = RCV_OWN;
  	 }
  
  	 if(dev->flags & IFF_PROMISC)
  		 ni65_init_lance(p,dev->dev_addr,0x00,M_PROM);
  	 else if(dev->mc_count || dev->flags & IFF_ALLMULTI)
  		 ni65_init_lance(p,dev->dev_addr,0xff,0x0);
  	 else
  		 ni65_init_lance(p,dev->dev_addr,0x00,0x00);
  
  	/*
  	 * ni65_set_lance_mem() sets L_ADDRREG to CSR0
  	 * NOW, WE WILL NEVER CHANGE THE L_ADDRREG, CSR0 IS ALWAYS SELECTED
  	 */
  
  	 if(inw(PORT+L_DATAREG) & CSR0_IDON)	{
  		 ni65_set_performance(p);
  					 /* init OK: start lance , enable interrupts */
  		 writedatareg(CSR0_CLRALL | CSR0_INEA | CSR0_STRT);
  		 return 1; /* ->OK */
  	 }
  	 printk(KERN_ERR "%s: can't init lance, status: %04x\n",dev->name,(int) inw(PORT+L_DATAREG));
  	 flags=claim_dma_lock();
  	 disable_dma(dev->dma);
  	 release_dma_lock(flags);
  	 return 0; /* ->Error */
  }
  
  /*
   * interrupt handler
   */
  static irqreturn_t ni65_interrupt(int irq, void * dev_id, struct pt_regs * regs)
  {
  	int csr0 = 0;
  	struct net_device *dev = dev_id;
  	struct priv *p;
  	int bcnt = 32;
  
  	p = (struct priv *) dev->priv;
  
  	spin_lock(&p->ring_lock);
  	
  	while(--bcnt) {
  		csr0 = inw(PORT+L_DATAREG);
  
  #if 0
  		writedatareg( (csr0 & CSR0_CLRALL) ); /* ack interrupts, disable int. */
  #else
  		writedatareg( (csr0 & CSR0_CLRALL) | CSR0_INEA ); /* ack interrupts, interrupts enabled */
  #endif
  
  		if(!(csr0 & (CSR0_ERR | CSR0_RINT | CSR0_TINT)))
  			break;
  
  		if(csr0 & CSR0_RINT) /* RECV-int? */
  			ni65_recv_intr(dev,csr0);
  		if(csr0 & CSR0_TINT) /* XMIT-int? */
  			ni65_xmit_intr(dev,csr0);
  
  		if(csr0 & CSR0_ERR)
  		{
  			struct priv *p = (struct priv *) dev->priv;
  			if(debuglevel > 1)
  				printk(KERN_ERR "%s: general error: %04x.\n",dev->name,csr0);
  			if(csr0 & CSR0_BABL)
  				p->stats.tx_errors++;
  			if(csr0 & CSR0_MISS) {
  				int i;
  				for(i=0;i<RMDNUM;i++)
  					printk("%02x ",p->rmdhead[i].u.s.status);
  				printk("\n");
  				p->stats.rx_errors++;
  			}
  			if(csr0 & CSR0_MERR) {
  				if(debuglevel > 1)
  					printk(KERN_ERR "%s: Ooops .. memory error: %04x.\n",dev->name,csr0);
  				ni65_stop_start(dev,p);
  			}
  		}
  	}
  
  #ifdef RCV_PARANOIA_CHECK
  {
   int j;
   for(j=0;j<RMDNUM;j++)
   {
  	struct priv *p = (struct priv *) dev->priv;
  	int i,k,num1,num2;
  	for(i=RMDNUM-1;i>0;i--) {
  		 num2 = (p->rmdnum + i) & (RMDNUM-1);
  		 if(!(p->rmdhead[num2].u.s.status & RCV_OWN))
  				break;
  	}
  
  	if(i) {
  		for(k=0;k<RMDNUM;k++) {
  			num1 = (p->rmdnum + k) & (RMDNUM-1);
  			if(!(p->rmdhead[num1].u.s.status & RCV_OWN))
  				break;
  		}
  		if(!k)
  			break;
  
  		if(debuglevel > 0)
  		{
  			char buf[256],*buf1;
  			int k;
  			buf1 = buf;
  			for(k=0;k<RMDNUM;k++) {
  				sprintf(buf1,"%02x ",(p->rmdhead[k].u.s.status)); /* & RCV_OWN) ); */
  				buf1 += 3;
  			}
  			*buf1 = 0;
  			printk(KERN_ERR "%s: Ooops, receive ring corrupted %2d %2d | %s\n",dev->name,p->rmdnum,i,buf);
  		}
  
  		p->rmdnum = num1;
  		ni65_recv_intr(dev,csr0);
  		if((p->rmdhead[num2].u.s.status & RCV_OWN))
  			break;	/* ok, we are 'in sync' again */
  	}
  	else
  		break;
   }
  }
  #endif
  
  	if( (csr0 & (CSR0_RXON | CSR0_TXON)) != (CSR0_RXON | CSR0_TXON) ) {
  		printk(KERN_DEBUG "%s: RX or TX was offline -> restart\n",dev->name);
  		ni65_stop_start(dev,p);
  	}
  	else
  		writedatareg(CSR0_INEA);
  
  	spin_unlock(&p->ring_lock);
  	return IRQ_HANDLED;
  }
  
  /*
   * We have received an Xmit-Interrupt ..
   * send a new packet if necessary
   */
  static void ni65_xmit_intr(struct net_device *dev,int csr0)
  {
  	struct priv *p = (struct priv *) dev->priv;
  
  	while(p->xmit_queued)
  	{
  		struct tmd *tmdp = p->tmdhead + p->tmdlast;
  		int tmdstat = tmdp->u.s.status;
  
  		if(tmdstat & XMIT_OWN)
  			break;
  
  		if(tmdstat & XMIT_ERR)
  		{
  #if 0
  			if(tmdp->status2 & XMIT_TDRMASK && debuglevel > 3)
  				printk(KERN_ERR "%s: tdr-problems (e.g. no resistor)\n",dev->name);
  #endif
  		 /* checking some errors */
  			if(tmdp->status2 & XMIT_RTRY)
  				p->stats.tx_aborted_errors++;
  			if(tmdp->status2 & XMIT_LCAR)
  				p->stats.tx_carrier_errors++;
  			if(tmdp->status2 & (XMIT_BUFF | XMIT_UFLO )) {
  		/* this stops the xmitter */
  				p->stats.tx_fifo_errors++;
  				if(debuglevel > 0)
  					printk(KERN_ERR "%s: Xmit FIFO/BUFF error\n",dev->name);
  				if(p->features & INIT_RING_BEFORE_START) {
  					tmdp->u.s.status = XMIT_OWN | XMIT_START | XMIT_END;	/* test: resend this frame */
  					ni65_stop_start(dev,p);
  					break;	/* no more Xmit processing .. */
  				}
  				else
  				 ni65_stop_start(dev,p);
  			}
  			if(debuglevel > 2)
  				printk(KERN_ERR "%s: xmit-error: %04x %02x-%04x\n",dev->name,csr0,(int) tmdstat,(int) tmdp->status2);
  			if(!(csr0 & CSR0_BABL)) /* don't count errors twice */
  				p->stats.tx_errors++;
  			tmdp->status2 = 0;
  		}
  		else {
  			p->stats.tx_bytes -= (short)(tmdp->blen);
  			p->stats.tx_packets++;
  		}
  
  #ifdef XMT_VIA_SKB
  		if(p->tmd_skb[p->tmdlast]) {
  			 dev_kfree_skb_irq(p->tmd_skb[p->tmdlast]);
  			 p->tmd_skb[p->tmdlast] = NULL;
  		}
  #endif
  
  		p->tmdlast = (p->tmdlast + 1) & (TMDNUM-1);
  		if(p->tmdlast == p->tmdnum)
  			p->xmit_queued = 0;
  	}
  	netif_wake_queue(dev);
  }
  
  /*
   * We have received a packet
   */
  static void ni65_recv_intr(struct net_device *dev,int csr0)
  {
  	struct rmd *rmdp;
  	int rmdstat,len;
  	int cnt=0;
  	struct priv *p = (struct priv *) dev->priv;
  
  	rmdp = p->rmdhead + p->rmdnum;
  	while(!( (rmdstat = rmdp->u.s.status) & RCV_OWN))
  	{
  		cnt++;
  		if( (rmdstat & (RCV_START | RCV_END | RCV_ERR)) != (RCV_START | RCV_END) ) /* error or oversized? */
  		{
  			if(!(rmdstat & RCV_ERR)) {
  				if(rmdstat & RCV_START)
  				{
  					p->stats.rx_length_errors++;
  					printk(KERN_ERR "%s: recv, packet too long: %d\n",dev->name,rmdp->mlen & 0x0fff);
  				}
  			}
  			else {
  				if(debuglevel > 2)
  					printk(KERN_ERR "%s: receive-error: %04x, lance-status: %04x/%04x\n",
  									dev->name,(int) rmdstat,csr0,(int) inw(PORT+L_DATAREG) );
  				if(rmdstat & RCV_FRAM)
  					p->stats.rx_frame_errors++;
  				if(rmdstat & RCV_OFLO)
  					p->stats.rx_over_errors++;
  				if(rmdstat & RCV_CRC)
  					p->stats.rx_crc_errors++;
  				if(rmdstat & RCV_BUF_ERR)
  					p->stats.rx_fifo_errors++;
  			}
  			if(!(csr0 & CSR0_MISS)) /* don't count errors twice */
  				p->stats.rx_errors++;
  		}
  		else if( (len = (rmdp->mlen & 0x0fff) - 4) >= 60)
  		{
  #ifdef RCV_VIA_SKB
  			struct sk_buff *skb = alloc_skb(R_BUF_SIZE+2+16,GFP_ATOMIC);
  			if (skb)
  				skb_reserve(skb,16);
  #else
  			struct sk_buff *skb = dev_alloc_skb(len+2);
  #endif
  			if(skb)
  			{
  				skb_reserve(skb,2);
  	skb->dev = dev;
  #ifdef RCV_VIA_SKB
  				if( (unsigned long) (skb->data + R_BUF_SIZE) > 0x1000000) {
  					skb_put(skb,len);
  					eth_copy_and_sum(skb, (unsigned char *)(p->recv_skb[p->rmdnum]->data),len,0);
  				}
  				else {
  					struct sk_buff *skb1 = p->recv_skb[p->rmdnum];
  					skb_put(skb,R_BUF_SIZE);
  					p->recv_skb[p->rmdnum] = skb;
  					rmdp->u.buffer = (u32) isa_virt_to_bus(skb->data);
  					skb = skb1;
  					skb_trim(skb,len);
  				}
  #else
  				skb_put(skb,len);
  				eth_copy_and_sum(skb, (unsigned char *) p->recvbounce[p->rmdnum],len,0);
  #endif
  				p->stats.rx_packets++;
  				p->stats.rx_bytes += len;
  				skb->protocol=eth_type_trans(skb,dev);
  				netif_rx(skb);
  				dev->last_rx = jiffies;
  			}
  			else
  			{
  				printk(KERN_ERR "%s: can't alloc new sk_buff\n",dev->name);
  				p->stats.rx_dropped++;
  			}
  		}
  		else {
  			printk(KERN_INFO "%s: received runt packet\n",dev->name);
  			p->stats.rx_errors++;
  		}
  		rmdp->blen = -(R_BUF_SIZE-8);
  		rmdp->mlen = 0;
  		rmdp->u.s.status = RCV_OWN; /* change owner */
  		p->rmdnum = (p->rmdnum + 1) & (RMDNUM-1);
  		rmdp = p->rmdhead + p->rmdnum;
  	}
  }
  
  /*
   * kick xmitter ..
   */
   
  static void ni65_timeout(struct net_device *dev)
  {
  	int i;
  	struct priv *p = (struct priv *) dev->priv;
  
  	printk(KERN_ERR "%s: xmitter timed out, try to restart!\n",dev->name);
  	for(i=0;i<TMDNUM;i++)
  		printk("%02x ",p->tmdhead[i].u.s.status);
  	printk("\n");
  	ni65_lance_reinit(dev);
  	dev->trans_start = jiffies;
  	netif_wake_queue(dev);
  }
  
  /*
   *	Send a packet
   */
  
  static int ni65_send_packet(struct sk_buff *skb, struct net_device *dev)
  {
  	struct priv *p = (struct priv *) dev->priv;
  
  	netif_stop_queue(dev);
  	
  	if (test_and_set_bit(0, (void*)&p->lock)) {
  		printk(KERN_ERR "%s: Queue was locked.\n", dev->name);
  		return 1;
  	}
  
  	{
  		short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
  		struct tmd *tmdp;
  		unsigned long flags;
  
  #ifdef XMT_VIA_SKB
  		if( (unsigned long) (skb->data + skb->len) > 0x1000000) {
  #endif
  
  			memcpy((char *) p->tmdbounce[p->tmdbouncenum] ,(char *)skb->data,
  							 (skb->len > T_BUF_SIZE) ? T_BUF_SIZE : skb->len);
  			if (len > skb->len)
  				memset((char *)p->tmdbounce[p->tmdbouncenum]+skb->len, 0, len-skb->len);
  			dev_kfree_skb (skb);
  
  			spin_lock_irqsave(&p->ring_lock, flags);
  			tmdp = p->tmdhead + p->tmdnum;
  			tmdp->u.buffer = (u32) isa_virt_to_bus(p->tmdbounce[p->tmdbouncenum]);
  			p->tmdbouncenum = (p->tmdbouncenum + 1) & (TMDNUM - 1);
  
  #ifdef XMT_VIA_SKB
  		}
  		else {
  			spin_lock_irqsave(&p->ring_lock, flags);
  
  			tmdp = p->tmdhead + p->tmdnum;
  			tmdp->u.buffer = (u32) isa_virt_to_bus(skb->data);
  			p->tmd_skb[p->tmdnum] = skb;
  		}
  #endif
  		tmdp->blen = -len;
  
  		tmdp->u.s.status = XMIT_OWN | XMIT_START | XMIT_END;
  		writedatareg(CSR0_TDMD | CSR0_INEA); /* enable xmit & interrupt */
  
  		p->xmit_queued = 1;
  		p->tmdnum = (p->tmdnum + 1) & (TMDNUM-1);
  
  		if(p->tmdnum != p->tmdlast)
  			netif_wake_queue(dev);
  			
  		p->lock = 0;
  		dev->trans_start = jiffies;
  		
  		spin_unlock_irqrestore(&p->ring_lock, flags);
  	}
  
  	return 0;
  }
  
  static struct net_device_stats *ni65_get_stats(struct net_device *dev)
  {
  
  #if 0
  	int i;
  	struct priv *p = (struct priv *) dev->priv;
  	for(i=0;i<RMDNUM;i++)
  	{
  		struct rmd *rmdp = p->rmdhead + ((p->rmdnum + i) & (RMDNUM-1));
  		printk("%02x ",rmdp->u.s.status);
  	}
  	printk("\n");
  #endif
  
  	return &((struct priv *) dev->priv)->stats;
  }
  
  static void set_multicast_list(struct net_device *dev)
  {
  	if(!ni65_lance_reinit(dev))
  		printk(KERN_ERR "%s: Can't switch card into MC mode!\n",dev->name);
  	netif_wake_queue(dev);
  }
  
  #ifdef MODULE
  static struct net_device dev_ni65 = { .base_addr = 0x360, .irq = 9, .init = ni65_probe };
  
  /* set: io,irq,dma or set it when calling insmod */
  static int irq;
  static int io;
  static int dma;
  
  MODULE_PARM(irq, "i");
  MODULE_PARM(io, "i");
  MODULE_PARM(dma, "i");
  MODULE_PARM_DESC(irq, "ni6510 IRQ number (ignored for some cards)");
  MODULE_PARM_DESC(io, "ni6510 I/O base address");
  MODULE_PARM_DESC(dma, "ni6510 ISA DMA channel (ignored for some cards)");
  
  int init_module(void)
  {
  	dev_ni65.irq = irq;
  	dev_ni65.dma = dma;
  	dev_ni65.base_addr = io;
  	if (register_netdev(&dev_ni65) != 0)
  		return -EIO;
  	return 0;
  }
  
  void cleanup_module(void)
  {
  	struct priv *p;
  	p = (struct priv *) dev_ni65.priv;
  	if(!p)
  		BUG();
  	disable_dma(dev_ni65.dma);
  	free_dma(dev_ni65.dma);
  	unregister_netdev(&dev_ni65);
  	release_region(dev_ni65.base_addr,cards[p->cardno].total_size);
  	ni65_free_buffer(p);
  	dev_ni65.priv = NULL;
  }
  #endif /* MODULE */
  
  MODULE_LICENSE("GPL");
  
  /*
   * END of ni65.c
   */
  