text: /*
   * Sun3 i82586 Ethernet driver
   *
   * Cloned from ni52.c for the Sun3 by Sam Creasey (sammy@sammy.net)
   *
   * Original copyright follows:
   * --------------------------
   *
   * 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 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)
   * --------------------------
   *
   * Consult ni52.c for further notes from the original driver.
   *
   * This incarnation currently supports the OBIO version of the i82586 chip
   * used in certain sun3 models.  It should be fairly doable to expand this
   * to support VME if I should every acquire such a board.
   *
   */
  
  static int debuglevel = 0; /* debug-printk 0: off 1: a few 2: more */
  static int automatic_resume = 0; /* experimental .. better should be zero */
  static int rfdadd = 0; /* rfdadd=1 may be better for 8K MEM cards */
  static int fifo=0x8;	/* don't change */
  
  #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 <asm/idprom.h>
  #include <asm/machines.h>
  #include <asm/sun3mmu.h>
  #include <asm/dvma.h>
  #include <asm/byteorder.h>
  
  #include <linux/netdevice.h>
  #include <linux/etherdevice.h>
  #include <linux/skbuff.h>
  
  #include "sun3_82586.h"
  
  #define DRV_NAME "sun3_82586"
  
  #define DEBUG       /* debug on */
  #define SYSBUSVAL 0 /* 16 Bit */
  #define SUN3_82586_TOTAL_SIZE	PAGE_SIZE
  
  #define sun3_attn586()  {*(volatile unsigned char *)(dev->base_addr) |= IEOB_ATTEN; *(volatile unsigned char *)(dev->base_addr) &= ~IEOB_ATTEN;}
  #define sun3_reset586() {*(volatile unsigned char *)(dev->base_addr) = 0; udelay(100); *(volatile unsigned char *)(dev->base_addr) = IEOB_NORSET;}
  #define sun3_disint()   {*(volatile unsigned char *)(dev->base_addr) &= ~IEOB_IENAB;}
  #define sun3_enaint()   {*(volatile unsigned char *)(dev->base_addr) |= IEOB_IENAB;}
  #define sun3_active()   {*(volatile unsigned char *)(dev->base_addr) |= (IEOB_IENAB|IEOB_ONAIR|IEOB_NORSET);}
  
  #define make32(ptr16) (p->memtop + (swab16((unsigned short) (ptr16))) )
  #define make24(ptr32) (char *)swab32(( ((unsigned long) (ptr32)) - p->base))
  #define make16(ptr32) (swab16((unsigned short) ((unsigned long)(ptr32) - (unsigned long) 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 1536 /* slightly oversized */
  #define XMIT_BUFF_SIZE 1536 /* slightly oversized */
  #define NUM_XMIT_BUFFS 1    /* config for 32K shmem */
  #define NUM_RECV_BUFFS_8 4 /* config for 32K shared mem */
  #define NUM_RECV_BUFFS_16 9 /* config for 32K shared mem */
  #define NUM_RECV_BUFFS_32 16 /* config for 32K shared mem */
  #define NO_NOPCOMMANDS      /* only possible with NUM_XMIT_BUFFS=1 */
  
  /**************************************************************************/
  
  /* different DELAYs */
  #define DELAY(x) mdelay(32 * x);
  #define DELAY_16(); { udelay(16); }
  #define DELAY_18(); { udelay(4); }
  
  /* wait for command with timeout: */
  #define WAIT_4_SCB_CMD() \
  { int i; \
    for(i=0;i<16384;i++) { \
      if(!p->scb->cmd_cuc) break; \
      DELAY_18(); \
      if(i == 16383) { \
        printk("%s: scb_cmd timed out: %04x,%04x .. disabling i82586!!\n",dev->name,p->scb->cmd_cuc,p->scb->cus); \
         if(!p->reseted) { p->reseted = 1; sun3_reset586(); } } } }
  
  #define WAIT_4_SCB_CMD_RUC() { int i; \
    for(i=0;i<16384;i++) { \
      if(!p->scb->cmd_ruc) break; \
      DELAY_18(); \
      if(i == 16383) { \
        printk("%s: scb_cmd (ruc) timed out: %04x,%04x .. disabling i82586!!\n",dev->name,p->scb->cmd_ruc,p->scb->rus); \
         if(!p->reseted) { p->reseted = 1; sun3_reset586(); } } } }
  
  #define WAIT_4_STAT_COMPL(addr) { int i; \
     for(i=0;i<32767;i++) { \
       if(swab16((addr)->cmd_status) & STAT_COMPL) break; \
       DELAY_16(); DELAY_16(); } }
  
  static int     sun3_82586_probe1(struct net_device *dev,int ioaddr);
  static irqreturn_t sun3_82586_interrupt(int irq,void *dev_id);
  static int     sun3_82586_open(struct net_device *dev);
  static int     sun3_82586_close(struct net_device *dev);
  static int     sun3_82586_send_packet(struct sk_buff *,struct net_device *);
  static struct  net_device_stats *sun3_82586_get_stats(struct net_device *dev);
  static void    set_multicast_list(struct net_device *dev);
  static void    sun3_82586_timeout(struct net_device *dev);
  #if 0
  static void    sun3_82586_dump(struct net_device *,void *);
  #endif
  
  /* helper-functions */
  static int     init586(struct net_device *dev);
  static int     check586(struct net_device *dev,char *where,unsigned size);
  static void    alloc586(struct net_device *dev);
  static void    startrecv586(struct net_device *dev);
  static void   *alloc_rfa(struct net_device *dev,void *ptr);
  static void    sun3_82586_rcv_int(struct net_device *dev);
  static void    sun3_82586_xmt_int(struct net_device *dev);
  static void    sun3_82586_rnr_int(struct net_device *dev);
  
  struct priv
  {
  	unsigned long base;
  	char *memtop;
  	long int lock;
  	int reseted;
  	volatile struct rfd_struct	*rfd_last,*rfd_top,*rfd_first;
  	volatile struct scp_struct	*scp;	/* volatile is important */
  	volatile struct iscp_struct	*iscp;	/* volatile is important */
  	volatile struct scb_struct	*scb;	/* volatile is important */
  	volatile struct tbd_struct	*xmit_buffs[NUM_XMIT_BUFFS];
  	volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS];
  #if (NUM_XMIT_BUFFS == 1)
  	volatile struct nop_cmd_struct *nop_cmds[2];
  #else
  	volatile struct nop_cmd_struct *nop_cmds[NUM_XMIT_BUFFS];
  #endif
  	volatile int		nop_point,num_recv_buffs;
  	volatile char		*xmit_cbuffs[NUM_XMIT_BUFFS];
  	volatile int		xmit_count,xmit_last;
  };
  
  /**********************************************
   * close device
   */
  static int sun3_82586_close(struct net_device *dev)
  {
  	free_irq(dev->irq, dev);
  
  	sun3_reset586(); /* the hard way to stop the receiver */
  
  	netif_stop_queue(dev);
  
  	return 0;
  }
  
  /**********************************************
   * open device
   */
  static int sun3_82586_open(struct net_device *dev)
  {
  	int ret;
  
  	sun3_disint();
  	alloc586(dev);
  	init586(dev);
  	startrecv586(dev);
  	sun3_enaint();
  
  	ret = request_irq(dev->irq, sun3_82586_interrupt,0,dev->name,dev);
  	if (ret)
  	{
  		sun3_reset586();
  		return ret;
  	}
  
  	netif_start_queue(dev);
  
  	return 0; /* most done by init */
  }
  
  /**********************************************
   * Check to see if there's an 82586 out there.
   */
  static int check586(struct net_device *dev,char *where,unsigned size)
  {
  	struct priv pb;
  	struct priv *p = &pb;
  	char *iscp_addr;
  	int i;
  
  	p->base = (unsigned long) dvma_btov(0);
  	p->memtop = (char *)dvma_btov((unsigned long)where);
  	p->scp = (struct scp_struct *)(p->base + SCP_DEFAULT_ADDRESS);
  	memset((char *)p->scp,0, sizeof(struct scp_struct));
  	for(i=0;i<sizeof(struct scp_struct);i++) /* memory was writeable? */
  		if(((char *)p->scp)[i])
  			return 0;
  	p->scp->sysbus = SYSBUSVAL;				/* 1 = 8Bit-Bus, 0 = 16 Bit */
  	if(p->scp->sysbus != SYSBUSVAL)
  		return 0;
  
  	iscp_addr = (char *)dvma_btov((unsigned long)where);
  
  	p->iscp = (struct iscp_struct *) iscp_addr;
  	memset((char *)p->iscp,0, sizeof(struct iscp_struct));
  
  	p->scp->iscp = make24(p->iscp);
  	p->iscp->busy = 1;
  
  	sun3_reset586();
  	sun3_attn586();
  	DELAY(1);	/* wait a while... */
  
  	if(p->iscp->busy) /* i82586 clears 'busy' after successful init */
  		return 0;
  
  	return 1;
  }
  
  /******************************************************************
   * set iscp at the right place, called by sun3_82586_probe1 and open586.
   */
  static void alloc586(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  
  	sun3_reset586();
  	DELAY(1);
  
  	p->scp	= (struct scp_struct *)	(p->base + SCP_DEFAULT_ADDRESS);
  	p->iscp	= (struct iscp_struct *) dvma_btov(dev->mem_start);
  	p->scb  = (struct scb_struct *)  ((char *)p->iscp + sizeof(struct iscp_struct));
  
  	memset((char *) p->iscp,0,sizeof(struct iscp_struct));
  	memset((char *) p->scp ,0,sizeof(struct scp_struct));
  
  	p->scp->iscp = make24(p->iscp);
  	p->scp->sysbus = SYSBUSVAL;
  	p->iscp->scb_offset = make16(p->scb);
  	p->iscp->scb_base = make24(dvma_btov(dev->mem_start));
  
  	p->iscp->busy = 1;
  	sun3_reset586();
  	sun3_attn586();
  
  	DELAY(1);
  
  	if(p->iscp->busy)
  		printk("%s: Init-Problems (alloc).\n",dev->name);
  
  	p->reseted = 0;
  
  	memset((char *)p->scb,0,sizeof(struct scb_struct));
  }
  
  struct net_device * __init sun3_82586_probe(int unit)
  {
  	struct net_device *dev;
  	unsigned long ioaddr;
  	static int found = 0;
  	int err = -ENOMEM;
  
  	/* check that this machine has an onboard 82586 */
  	switch(idprom->id_machtype) {
  	case SM_SUN3|SM_3_160:
  	case SM_SUN3|SM_3_260:
  		/* these machines have 82586 */
  		break;
  
  	default:
  		return ERR_PTR(-ENODEV);
  	}
  
  	if (found)
  		return ERR_PTR(-ENODEV);
  
  	ioaddr = (unsigned long)ioremap(IE_OBIO, SUN3_82586_TOTAL_SIZE);
  	if (!ioaddr)
  		return ERR_PTR(-ENOMEM);
  	found = 1;
  
  	dev = alloc_etherdev(sizeof(struct priv));
  	if (!dev)
  		goto out;
  	if (unit >= 0) {
  		sprintf(dev->name, "eth%d", unit);
  		netdev_boot_setup_check(dev);
  	}
  
  	dev->irq = IE_IRQ;
  	dev->base_addr = ioaddr;
  	err = sun3_82586_probe1(dev, ioaddr);
  	if (err)
  		goto out1;
  	err = register_netdev(dev);
  	if (err)
  		goto out2;
  	return dev;
  
  out2:
  	release_region(ioaddr, SUN3_82586_TOTAL_SIZE);
  out1:
  	free_netdev(dev);
  out:
  	iounmap((void __iomem *)ioaddr);
  	return ERR_PTR(err);
  }
  
  static const struct net_device_ops sun3_82586_netdev_ops = {
  	.ndo_open		= sun3_82586_open,
  	.ndo_stop		= sun3_82586_close,
  	.ndo_start_xmit		= sun3_82586_send_packet,
  	.ndo_set_rx_mode	= set_multicast_list,
  	.ndo_tx_timeout		= sun3_82586_timeout,
  	.ndo_get_stats		= sun3_82586_get_stats,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_set_mac_address	= eth_mac_addr,
  	.ndo_change_mtu		= eth_change_mtu,
  };
  
  static int __init sun3_82586_probe1(struct net_device *dev,int ioaddr)
  {
  	int i, size, retval;
  
  	if (!request_region(ioaddr, SUN3_82586_TOTAL_SIZE, DRV_NAME))
  		return -EBUSY;
  
  	/* copy in the ethernet address from the prom */
  	for(i = 0; i < 6 ; i++)
  	     dev->dev_addr[i] = idprom->id_ethaddr[i];
  
  	printk("%s: SUN3 Intel 82586 found at %lx, ",dev->name,dev->base_addr);
  
  	/*
  	 * check (or search) IO-Memory, 32K
  	 */
  	size = 0x8000;
  
  	dev->mem_start = (unsigned long)dvma_malloc_align(0x8000, 0x1000);
  	dev->mem_end = dev->mem_start + size;
  
  	if(size != 0x2000 && size != 0x4000 && size != 0x8000) {
  		printk("\n%s: Illegal memory size %d. Allowed is 0x2000 or 0x4000 or 0x8000 bytes.\n",dev->name,size);
  		retval = -ENODEV;
  		goto out;
  	}
  	if(!check586(dev,(char *) dev->mem_start,size)) {
  		printk("?memcheck, Can't find memory at 0x%lx with size %d!\n",dev->mem_start,size);
  		retval = -ENODEV;
  		goto out;
  	}
  
  	((struct priv *)netdev_priv(dev))->memtop =
  					(char *)dvma_btov(dev->mem_start);
  	((struct priv *)netdev_priv(dev))->base = (unsigned long) dvma_btov(0);
  	alloc586(dev);
  
  	/* set number of receive-buffs according to memsize */
  	if(size == 0x2000)
  		((struct priv *)netdev_priv(dev))->num_recv_buffs =
  							NUM_RECV_BUFFS_8;
  	else if(size == 0x4000)
  		((struct priv *)netdev_priv(dev))->num_recv_buffs =
  							NUM_RECV_BUFFS_16;
  	else
  		((struct priv *)netdev_priv(dev))->num_recv_buffs =
  							NUM_RECV_BUFFS_32;
  
  	printk("Memaddr: 0x%lx, Memsize: %d, IRQ %d\n",dev->mem_start,size, dev->irq);
  
  	dev->netdev_ops		= &sun3_82586_netdev_ops;
  	dev->watchdog_timeo	= HZ/20;
  
  	dev->if_port 		= 0;
  	return 0;
  out:
  	release_region(ioaddr, SUN3_82586_TOTAL_SIZE);
  	return retval;
  }
  
  
  static int init586(struct net_device *dev)
  {
  	void *ptr;
  	int i,result=0;
  	struct priv *p = netdev_priv(dev);
  	volatile struct configure_cmd_struct	*cfg_cmd;
  	volatile struct iasetup_cmd_struct *ias_cmd;
  	volatile struct tdr_cmd_struct *tdr_cmd;
  	volatile struct mcsetup_cmd_struct *mc_cmd;
  	struct netdev_hw_addr *ha;
  	int num_addrs=netdev_mc_count(dev);
  
  	ptr = (void *) ((char *)p->scb + sizeof(struct scb_struct));
  
  	cfg_cmd = (struct configure_cmd_struct *)ptr; /* configure-command */
  	cfg_cmd->cmd_status	= 0;
  	cfg_cmd->cmd_cmd	= swab16(CMD_CONFIGURE | CMD_LAST);
  	cfg_cmd->cmd_link	= 0xffff;
  
  	cfg_cmd->byte_cnt	= 0x0a; /* number of cfg bytes */
  	cfg_cmd->fifo		= fifo; /* fifo-limit (8=tx:32/rx:64) */
  	cfg_cmd->sav_bf		= 0x40; /* hold or discard bad recv frames (bit 7) */
  	cfg_cmd->adr_len	= 0x2e; /* addr_len |!src_insert |pre-len |loopback */
  	cfg_cmd->priority	= 0x00;
  	cfg_cmd->ifs		= 0x60;
  	cfg_cmd->time_low	= 0x00;
  	cfg_cmd->time_high	= 0xf2;
  	cfg_cmd->promisc	= 0;
  	if(dev->flags & IFF_ALLMULTI) {
  		int len = ((char *) p->iscp - (char *) ptr - 8) / 6;
  		if(num_addrs > len)	{
  			printk("%s: switching to promisc. mode\n",dev->name);
  			cfg_cmd->promisc = 1;
  		}
  	}
  	if(dev->flags&IFF_PROMISC)
  		cfg_cmd->promisc = 1;
  	cfg_cmd->carr_coll	= 0x00;
  
  	p->scb->cbl_offset	= make16(cfg_cmd);
  	p->scb->cmd_ruc		= 0;
  
  	p->scb->cmd_cuc		= CUC_START; /* cmd.-unit start */
  	sun3_attn586();
  
  	WAIT_4_STAT_COMPL(cfg_cmd);
  
  	if((swab16(cfg_cmd->cmd_status) & (STAT_OK|STAT_COMPL)) != (STAT_COMPL|STAT_OK))
  	{
  		printk("%s: configure command failed: %x\n",dev->name,swab16(cfg_cmd->cmd_status));
  		return 1;
  	}
  
  	/*
  	 * individual address setup
  	 */
  
  	ias_cmd = (struct iasetup_cmd_struct *)ptr;
  
  	ias_cmd->cmd_status	= 0;
  	ias_cmd->cmd_cmd	= swab16(CMD_IASETUP | CMD_LAST);
  	ias_cmd->cmd_link	= 0xffff;
  
  	memcpy((char *)&ias_cmd->iaddr,(char *) dev->dev_addr,ETH_ALEN);
  
  	p->scb->cbl_offset = make16(ias_cmd);
  
  	p->scb->cmd_cuc = CUC_START; /* cmd.-unit start */
  	sun3_attn586();
  
  	WAIT_4_STAT_COMPL(ias_cmd);
  
  	if((swab16(ias_cmd->cmd_status) & (STAT_OK|STAT_COMPL)) != (STAT_OK|STAT_COMPL)) {
  		printk("%s (82586): individual address setup command failed: %04x\n",dev->name,swab16(ias_cmd->cmd_status));
  		return 1;
  	}
  
  	/*
  	 * TDR, wire check .. e.g. no resistor e.t.c
  	 */
  
  	tdr_cmd = (struct tdr_cmd_struct *)ptr;
  
  	tdr_cmd->cmd_status	= 0;
  	tdr_cmd->cmd_cmd	= swab16(CMD_TDR | CMD_LAST);
  	tdr_cmd->cmd_link	= 0xffff;
  	tdr_cmd->status		= 0;
  
  	p->scb->cbl_offset = make16(tdr_cmd);
  	p->scb->cmd_cuc = CUC_START; /* cmd.-unit start */
  	sun3_attn586();
  
  	WAIT_4_STAT_COMPL(tdr_cmd);
  
  	if(!(swab16(tdr_cmd->cmd_status) & STAT_COMPL))
  	{
  		printk("%s: Problems while running the TDR.\n",dev->name);
  	}
  	else
  	{
  		DELAY_16(); /* wait for result */
  		result = swab16(tdr_cmd->status);
  
  		p->scb->cmd_cuc = p->scb->cus & STAT_MASK;
  		sun3_attn586(); /* ack the interrupts */
  
  		if(result & TDR_LNK_OK)
  			;
  		else if(result & TDR_XCVR_PRB)
  			printk("%s: TDR: Transceiver problem. Check the cable(s)!\n",dev->name);
  		else if(result & TDR_ET_OPN)
  			printk("%s: TDR: No correct termination %d clocks away.\n",dev->name,result & TDR_TIMEMASK);
  		else if(result & TDR_ET_SRT)
  		{
  			if (result & TDR_TIMEMASK) /* time == 0 -> strange :-) */
  				printk("%s: TDR: Detected a short circuit %d clocks away.\n",dev->name,result & TDR_TIMEMASK);
  		}
  		else
  			printk("%s: TDR: Unknown status %04x\n",dev->name,result);
  	}
  
  	/*
  	 * Multicast setup
  	 */
  	if(num_addrs && !(dev->flags & IFF_PROMISC) )
  	{
  		mc_cmd = (struct mcsetup_cmd_struct *) ptr;
  		mc_cmd->cmd_status = 0;
  		mc_cmd->cmd_cmd = swab16(CMD_MCSETUP | CMD_LAST);
  		mc_cmd->cmd_link = 0xffff;
  		mc_cmd->mc_cnt = swab16(num_addrs * 6);
  
  		i = 0;
  		netdev_for_each_mc_addr(ha, dev)
  			memcpy((char *) mc_cmd->mc_list[i++],
  			       ha->addr, ETH_ALEN);
  
  		p->scb->cbl_offset = make16(mc_cmd);
  		p->scb->cmd_cuc = CUC_START;
  		sun3_attn586();
  
  		WAIT_4_STAT_COMPL(mc_cmd);
  
  		if( (swab16(mc_cmd->cmd_status) & (STAT_COMPL|STAT_OK)) != (STAT_COMPL|STAT_OK) )
  			printk("%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] 			= (struct nop_cmd_struct *)ptr;
  		p->nop_cmds[i]->cmd_cmd		= swab16(CMD_NOP);
  		p->nop_cmds[i]->cmd_status 	= 0;
  		p->nop_cmds[i]->cmd_link	= make16((p->nop_cmds[i]));
  		ptr = (char *) ptr + sizeof(struct nop_cmd_struct);
  	}
  #else
  	for(i=0;i<NUM_XMIT_BUFFS;i++)
  	{
  		p->nop_cmds[i]			= (struct nop_cmd_struct *)ptr;
  		p->nop_cmds[i]->cmd_cmd		= swab16(CMD_NOP);
  		p->nop_cmds[i]->cmd_status	= 0;
  		p->nop_cmds[i]->cmd_link	= make16((p->nop_cmds[i]));
  		ptr = (char *) 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++)
  	{
  		p->xmit_cmds[i] = (struct transmit_cmd_struct *)ptr; /*transmit cmd/buff 0*/
  		ptr = (char *) ptr + sizeof(struct transmit_cmd_struct);
  		p->xmit_cbuffs[i] = (char *)ptr; /* char-buffs */
  		ptr = (char *) ptr + XMIT_BUFF_SIZE;
  		p->xmit_buffs[i] = (struct tbd_struct *)ptr; /* TBD */
  		ptr = (char *) ptr + sizeof(struct tbd_struct);
  		if(ptr > (void *)dev->mem_end)
  		{
  			printk("%s: not enough shared-mem for your configuration!\n",dev->name);
  			return 1;
  		}
  		memset((char *)(p->xmit_cmds[i]) ,0, sizeof(struct transmit_cmd_struct));
  		memset((char *)(p->xmit_buffs[i]),0, sizeof(struct tbd_struct));
  		p->xmit_cmds[i]->cmd_link = make16(p->nop_cmds[(i+1)%NUM_XMIT_BUFFS]);
  		p->xmit_cmds[i]->cmd_status = swab16(STAT_COMPL);
  		p->xmit_cmds[i]->cmd_cmd = swab16(CMD_XMIT | CMD_INT);
  		p->xmit_cmds[i]->tbd_offset = make16((p->xmit_buffs[i]));
  		p->xmit_buffs[i]->next = 0xffff;
  		p->xmit_buffs[i]->buffer = make24((p->xmit_cbuffs[i]));
  	}
  
  	p->xmit_count = 0;
  	p->xmit_last	= 0;
  #ifndef NO_NOPCOMMANDS
  	p->nop_point	= 0;
  #endif
  
  	 /*
  		* 'start transmitter'
  		*/
  #ifndef NO_NOPCOMMANDS
  	p->scb->cbl_offset = make16(p->nop_cmds[0]);
  	p->scb->cmd_cuc = CUC_START;
  	sun3_attn586();
  	WAIT_4_SCB_CMD();
  #else
  	p->xmit_cmds[0]->cmd_link = make16(p->xmit_cmds[0]);
  	p->xmit_cmds[0]->cmd_cmd	= swab16(CMD_XMIT | CMD_SUSPEND | CMD_INT);
  #endif
  
  	/*
  	 * ack. interrupts
  	 */
  	p->scb->cmd_cuc = p->scb->cus & STAT_MASK;
  	sun3_attn586();
  	DELAY_16();
  
  	sun3_enaint();
  	sun3_active();
  
  	return 0;
  }
  
  /******************************************************
   * This is a helper routine for sun3_82586_rnr_int() and init586().
   * It sets up the Receive Frame Area (RFA).
   */
  
  static void *alloc_rfa(struct net_device *dev,void *ptr)
  {
  	volatile struct rfd_struct *rfd = (struct rfd_struct *)ptr;
  	volatile struct rbd_struct *rbd;
  	int i;
  	struct priv *p = netdev_priv(dev);
  
  	memset((char *) 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++) {
  		rfd[i].next = make16(rfd + (i+1) % (p->num_recv_buffs+rfdadd) );
  		rfd[i].rbd_offset = 0xffff;
  	}
  	rfd[p->num_recv_buffs-1+rfdadd].last = RFD_SUSP;	 /* RU suspend */
  
  	ptr = (void *) (rfd + (p->num_recv_buffs + rfdadd) );
  
  	rbd = (struct rbd_struct *) ptr;
  	ptr = (void *) (rbd + p->num_recv_buffs);
  
  	 /* clr descriptors */
  	memset((char *) rbd,0,sizeof(struct rbd_struct)*(p->num_recv_buffs));
  
  	for(i=0;i<p->num_recv_buffs;i++)
  	{
  		rbd[i].next = make16((rbd + (i+1) % p->num_recv_buffs));
  		rbd[i].size = swab16(RECV_BUFF_SIZE);
  		rbd[i].buffer = make24(ptr);
  		ptr = (char *) ptr + RECV_BUFF_SIZE;
  	}
  
  	p->rfd_top	= p->rfd_first;
  	p->rfd_last = p->rfd_first + (p->num_recv_buffs - 1 + rfdadd);
  
  	p->scb->rfa_offset		= make16(p->rfd_first);
  	p->rfd_first->rbd_offset	= make16(rbd);
  
  	return ptr;
  }
  
  
  /**************************************************
   * Interrupt Handler ...
   */
  
  static irqreturn_t sun3_82586_interrupt(int irq,void *dev_id)
  {
  	struct net_device *dev = dev_id;
  	unsigned short stat;
  	int cnt=0;
  	struct priv *p;
  
  	if (!dev) {
  		printk ("sun3_82586-interrupt: irq %d for unknown device.\n",irq);
  		return IRQ_NONE;
  	}
  	p = netdev_priv(dev);
  
  	if(debuglevel > 1)
  		printk("I");
  
  	WAIT_4_SCB_CMD(); /* wait for last command	*/
  
  	while((stat=p->scb->cus & STAT_MASK))
  	{
  		p->scb->cmd_cuc = stat;
  		sun3_attn586();
  
  		if(stat & STAT_FR)	 /* received a frame */
  			sun3_82586_rcv_int(dev);
  
  		if(stat & STAT_RNR) /* RU went 'not ready' */
  		{
  			printk("(R)");
  			if(p->scb->rus & RU_SUSPEND) /* special case: RU_SUSPEND */
  			{
  				WAIT_4_SCB_CMD();
  				p->scb->cmd_ruc = RUC_RESUME;
  				sun3_attn586();
  				WAIT_4_SCB_CMD_RUC();
  			}
  			else
  			{
  				printk("%s: Receiver-Unit went 'NOT READY': %04x/%02x.\n",dev->name,(int) stat,(int) p->scb->rus);
  				sun3_82586_rnr_int(dev);
  			}
  		}
  
  		if(stat & STAT_CX)		/* command with I-bit set complete */
  			 sun3_82586_xmt_int(dev);
  
  #ifndef NO_NOPCOMMANDS
  		if(stat & STAT_CNA)	/* CU went 'not ready' */
  		{
  			if(netif_running(dev))
  				printk("%s: oops! CU has left active state. stat: %04x/%02x.\n",dev->name,(int) stat,(int) p->scb->cus);
  		}
  #endif
  
  		if(debuglevel > 1)
  			printk("%d",cnt++);
  
  		WAIT_4_SCB_CMD(); /* wait for ack. (sun3_82586_xmt_int can be faster than ack!!) */
  		if(p->scb->cmd_cuc)	 /* timed out? */
  		{
  			printk("%s: Acknowledge timed out.\n",dev->name);
  			sun3_disint();
  			break;
  		}
  	}
  
  	if(debuglevel > 1)
  		printk("i");
  	return IRQ_HANDLED;
  }
  
  /*******************************************************
   * receive-interrupt
   */
  
  static void sun3_82586_rcv_int(struct net_device *dev)
  {
  	int status,cnt=0;
  	unsigned short totlen;
  	struct sk_buff *skb;
  	struct rbd_struct *rbd;
  	struct priv *p = netdev_priv(dev);
  
  	if(debuglevel > 0)
  		printk("R");
  
  	for(;(status = p->rfd_top->stat_high) & RFD_COMPL;)
  	{
  			rbd = (struct rbd_struct *) make32(p->rfd_top->rbd_offset);
  
  			if(status & RFD_OK) /* frame received without error? */
  			{
  				if( (totlen = swab16(rbd->status)) & RBD_LAST) /* the first and the last buffer? */
  				{
  					totlen &= RBD_MASK; /* length of this frame */
  					rbd->status = 0;
  					skb = netdev_alloc_skb(dev, totlen + 2);
  					if(skb != NULL)
  					{
  						skb_reserve(skb,2);
  						skb_put(skb,totlen);
  						skb_copy_to_linear_data(skb,(char *) p->base+swab32((unsigned long) rbd->buffer),totlen);
  						skb->protocol=eth_type_trans(skb,dev);
  						netif_rx(skb);
  						dev->stats.rx_packets++;
  					}
  					else
  						dev->stats.rx_dropped++;
  				}
  				else
  				{
  					int rstat;
  						 /* free all RBD's until RBD_LAST is set */
  					totlen = 0;
  					while(!((rstat=swab16(rbd->status)) & RBD_LAST))
  					{
  						totlen += rstat & RBD_MASK;
  						if(!rstat)
  						{
  							printk("%s: Whoops .. no end mark in RBD list\n",dev->name);
  							break;
  						}
  						rbd->status = 0;
  						rbd = (struct rbd_struct *) make32(rbd->next);
  					}
  					totlen += rstat & RBD_MASK;
  					rbd->status = 0;
  					printk("%s: received oversized frame! length: %d\n",dev->name,totlen);
  					dev->stats.rx_dropped++;
  			 }
  		}
  		else /* frame !(ok), only with 'save-bad-frames' */
  		{
  			printk("%s: oops! rfd-error-status: %04x\n",dev->name,status);
  			dev->stats.rx_errors++;
  		}
  		p->rfd_top->stat_high = 0;
  		p->rfd_top->last = RFD_SUSP; /* maybe exchange by RFD_LAST */
  		p->rfd_top->rbd_offset = 0xffff;
  		p->rfd_last->last = 0;				/* delete RFD_SUSP	*/
  		p->rfd_last = p->rfd_top;
  		p->rfd_top = (struct rfd_struct *) make32(p->rfd_top->next); /* step to next RFD */
  		p->scb->rfa_offset = make16(p->rfd_top);
  
  		if(debuglevel > 0)
  			printk("%d",cnt++);
  	}
  
  	if(automatic_resume)
  	{
  		WAIT_4_SCB_CMD();
  		p->scb->cmd_ruc = RUC_RESUME;
  		sun3_attn586();
  		WAIT_4_SCB_CMD_RUC();
  	}
  
  #ifdef WAIT_4_BUSY
  	{
  		int i;
  		for(i=0;i<1024;i++)
  		{
  			if(p->rfd_top->status)
  				break;
  			DELAY_16();
  			if(i == 1023)
  				printk("%s: RU hasn't fetched next RFD (not busy/complete)\n",dev->name);
  		}
  	}
  #endif
  
  #if 0
  	if(!at_least_one)
  	{
  		int i;
  		volatile struct rfd_struct *rfds=p->rfd_top;
  		volatile struct rbd_struct *rbds;
  		printk("%s: received a FC intr. without having a frame: %04x %d\n",dev->name,status,old_at_least);
  		for(i=0;i< (p->num_recv_buffs+4);i++)
  		{
  			rbds = (struct rbd_struct *) make32(rfds->rbd_offset);
  			printk("%04x:%04x ",rfds->status,rbds->status);
  			rfds = (struct rfd_struct *) make32(rfds->next);
  		}
  		printk("\nerrs: %04x %04x stat: %04x\n",(int)p->scb->rsc_errs,(int)p->scb->ovrn_errs,(int)p->scb->status);
  		printk("\nerrs: %04x %04x rus: %02x, cus: %02x\n",(int)p->scb->rsc_errs,(int)p->scb->ovrn_errs,(int)p->scb->rus,(int)p->scb->cus);
  	}
  	old_at_least = at_least_one;
  #endif
  
  	if(debuglevel > 0)
  		printk("r");
  }
  
  /**********************************************************
   * handle 'Receiver went not ready'.
   */
  
  static void sun3_82586_rnr_int(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  
  	dev->stats.rx_errors++;
  
  	WAIT_4_SCB_CMD();		/* wait for the last cmd, WAIT_4_FULLSTAT?? */
  	p->scb->cmd_ruc = RUC_ABORT; /* usually the RU is in the 'no resource'-state .. abort it now. */
  	sun3_attn586();
  	WAIT_4_SCB_CMD_RUC();		/* wait for accept cmd. */
  
  	alloc_rfa(dev,(char *)p->rfd_first);
  /* maybe add a check here, before restarting the RU */
  	startrecv586(dev); /* restart RU */
  
  	printk("%s: Receive-Unit restarted. Status: %04x\n",dev->name,p->scb->rus);
  
  }
  
  /**********************************************************
   * handle xmit - interrupt
   */
  
  static void sun3_82586_xmt_int(struct net_device *dev)
  {
  	int status;
  	struct priv *p = netdev_priv(dev);
  
  	if(debuglevel > 0)
  		printk("X");
  
  	status = swab16(p->xmit_cmds[p->xmit_last]->cmd_status);
  	if(!(status & STAT_COMPL))
  		printk("%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("%s: late collision detected.\n",dev->name);
  			dev->stats.collisions++;
  		}
  		else if(status & TCMD_NOCARRIER) {
  			dev->stats.tx_carrier_errors++;
  			printk("%s: no carrier detected.\n",dev->name);
  		}
  		else if(status & TCMD_LOSTCTS)
  			printk("%s: loss of CTS detected.\n",dev->name);
  		else if(status & TCMD_UNDERRUN) {
  			dev->stats.tx_fifo_errors++;
  			printk("%s: DMA underrun detected.\n",dev->name);
  		}
  		else if(status & TCMD_MAXCOLL) {
  			printk("%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_4_SCB_CMD();
  	WAIT_4_SCB_CMD_RUC();
  	p->scb->rfa_offset = make16(p->rfd_first);
  	p->scb->cmd_ruc = RUC_START;
  	sun3_attn586();		/* start cmd. */
  	WAIT_4_SCB_CMD_RUC();	/* wait for accept cmd. (no timeout!!) */
  }
  
  static void sun3_82586_timeout(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  #ifndef NO_NOPCOMMANDS
  	if(p->scb->cus & CU_ACTIVE) /* COMMAND-UNIT active? */
  	{
  		netif_wake_queue(dev);
  #ifdef DEBUG
  		printk("%s: strange ... timeout with CU active?!?\n",dev->name);
  		printk("%s: X0: %04x N0: %04x N1: %04x %d\n",dev->name,(int)swab16(p->xmit_cmds[0]->cmd_status),(int)swab16(p->nop_cmds[0]->cmd_status),(int)swab16(p->nop_cmds[1]->cmd_status),(int)p->nop_point);
  #endif
  		p->scb->cmd_cuc = CUC_ABORT;
  		sun3_attn586();
  		WAIT_4_SCB_CMD();
  		p->scb->cbl_offset = make16(p->nop_cmds[p->nop_point]);
  		p->scb->cmd_cuc = CUC_START;
  		sun3_attn586();
  		WAIT_4_SCB_CMD();
  		dev->trans_start = jiffies; /* prevent tx timeout */
  		return 0;
  	}
  #endif
  	{
  #ifdef DEBUG
  		printk("%s: xmitter timed out, try to restart! stat: %02x\n",dev->name,p->scb->cus);
  		printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status));
  		printk("%s: check, whether you set the right interrupt number!\n",dev->name);
  #endif
  		sun3_82586_close(dev);
  		sun3_82586_open(dev);
  	}
  	dev->trans_start = jiffies; /* prevent tx timeout */
  }
  
  /******************************************************
   * send frame
   */
  
  static int sun3_82586_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("%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);
  
  #if(NUM_XMIT_BUFFS > 1)
  	if(test_and_set_bit(0,(void *) &p->lock)) {
  		printk("%s: Queue was locked\n",dev->name);
  		return NETDEV_TX_BUSY;
  	}
  	else
  #endif
  	{
  		len = skb->len;
  		if (len < ETH_ZLEN) {
  			memset((void *)p->xmit_cbuffs[p->xmit_count], 0,
  			       ETH_ZLEN);
  			len = ETH_ZLEN;
  		}
  		skb_copy_from_linear_data(skb, (void *)p->xmit_cbuffs[p->xmit_count], skb->len);
  
  #if (NUM_XMIT_BUFFS == 1)
  #	ifdef NO_NOPCOMMANDS
  
  #ifdef DEBUG
  		if(p->scb->cus & CU_ACTIVE)
  		{
  			printk("%s: Hmmm .. CU is still running and we wanna send a new packet.\n",dev->name);
  			printk("%s: stat: %04x %04x\n",dev->name,p->scb->cus,swab16(p->xmit_cmds[0]->cmd_status));
  		}
  #endif
  
  		p->xmit_buffs[0]->size = swab16(TBD_LAST | len);
  		for(i=0;i<16;i++)
  		{
  			p->xmit_cmds[0]->cmd_status = 0;
  			WAIT_4_SCB_CMD();
  			if( (p->scb->cus & CU_STATUS) == CU_SUSPEND)
  				p->scb->cmd_cuc = CUC_RESUME;
  			else
  			{
  				p->scb->cbl_offset = make16(p->xmit_cmds[0]);
  				p->scb->cmd_cuc = CUC_START;
  			}
  
  			sun3_attn586();
  			if(!i)
  				dev_kfree_skb(skb);
  			WAIT_4_SCB_CMD();
  			if( (p->scb->cus & CU_ACTIVE)) /* test it, because CU sometimes doesn't start immediately */
  				break;
  			if(p->xmit_cmds[0]->cmd_status)
  				break;
  			if(i==15)
  				printk("%s: Can't start transmit-command.\n",dev->name);
  		}
  #	else
  		next_nop = (p->nop_point + 1) & 0x1;
  		p->xmit_buffs[0]->size = swab16(TBD_LAST | len);
  
  		p->xmit_cmds[0]->cmd_link	 = p->nop_cmds[next_nop]->cmd_link
  			= make16((p->nop_cmds[next_nop]));
  		p->xmit_cmds[0]->cmd_status = p->nop_cmds[next_nop]->cmd_status = 0;
  
  		p->nop_cmds[p->nop_point]->cmd_link = make16((p->xmit_cmds[0]));
  		p->nop_point = next_nop;
  		dev_kfree_skb(skb);
  #	endif
  #else
  		p->xmit_buffs[p->xmit_count]->size = swab16(TBD_LAST | len);
  		if( (next_nop = p->xmit_count + 1) == NUM_XMIT_BUFFS )
  			next_nop = 0;
  
  		p->xmit_cmds[p->xmit_count]->cmd_status	= 0;
  		/* linkpointer of xmit-command already points to next nop cmd */
  		p->nop_cmds[next_nop]->cmd_link = make16((p->nop_cmds[next_nop]));
  		p->nop_cmds[next_nop]->cmd_status = 0;
  
  		p->nop_cmds[p->xmit_count]->cmd_link = make16((p->xmit_cmds[p->xmit_count]));
  		p->xmit_count = next_nop;
  
  		{
  			unsigned long flags;
  			local_irq_save(flags);
  			if(p->xmit_count != p->xmit_last)
  				netif_wake_queue(dev);
  			p->lock = 0;
  			local_irq_restore(flags);
  		}
  		dev_kfree_skb(skb);
  #endif
  	}
  	return NETDEV_TX_OK;
  }
  
  /*******************************************
   * Someone wanna have the statistics
   */
  
  static struct net_device_stats *sun3_82586_get_stats(struct net_device *dev)
  {
  	struct priv *p = netdev_priv(dev);
  	unsigned short crc,aln,rsc,ovrn;
  
  	crc = swab16(p->scb->crc_errs); /* get error-statistic from the ni82586 */
  	p->scb->crc_errs = 0;
  	aln = swab16(p->scb->aln_errs);
  	p->scb->aln_errs = 0;
  	rsc = swab16(p->scb->rsc_errs);
  	p->scb->rsc_errs = 0;
  	ovrn = swab16(p->scb->ovrn_errs);
  	p->scb->ovrn_errs = 0;
  
  	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);
  	sun3_disint();
  	alloc586(dev);
  	init586(dev);
  	startrecv586(dev);
  	sun3_enaint();
  	netif_wake_queue(dev);
  }
  
  #if 0
  /*
   * DUMP .. we expect a not running CMD unit and enough space
   */
  void sun3_82586_dump(struct net_device *dev,void *ptr)
  {
  	struct priv *p = netdev_priv(dev);
  	struct dump_cmd_struct *dump_cmd = (struct dump_cmd_struct *) ptr;
  	int i;
  
  	p->scb->cmd_cuc = CUC_ABORT;
  	sun3_attn586();
  	WAIT_4_SCB_CMD();
  	WAIT_4_SCB_CMD_RUC();
  
  	dump_cmd->cmd_status = 0;
  	dump_cmd->cmd_cmd = CMD_DUMP | CMD_LAST;
  	dump_cmd->dump_offset = make16((dump_cmd + 1));
  	dump_cmd->cmd_link = 0xffff;
  
  	p->scb->cbl_offset = make16(dump_cmd);
  	p->scb->cmd_cuc = CUC_START;
  	sun3_attn586();
  	WAIT_4_STAT_COMPL(dump_cmd);
  
  	if( (dump_cmd->cmd_status & (STAT_COMPL|STAT_OK)) != (STAT_COMPL|STAT_OK) )
  				printk("%s: Can't get dump information.\n",dev->name);
  
  	for(i=0;i<170;i++) {
  		printk("%02x ",(int) ((unsigned char *) (dump_cmd + 1))[i]);
  		if(i % 24 == 23)
  			printk("\n");
  	}
  	printk("\n");
  }
  #endif
  