Initial source

1 files changed, 1110 insertions, 0 deletions

diff --git a/i386/i386at/gpl/linux/net/ni52.c b/i386/i386at/gpl/linux/net/ni52.c
new file mode 100644
index 00000000..13d12359
--- /dev/null
+++ b/i386/i386at/gpl/linux/net/ni52.c
@@ -0,0 +1,1110 @@
+/* 
+ * 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 0.62 (95/01/19) for Linux 1.1.82 (or later)
+ * Copyrights (c) 1994,1995 by M.Hipp (Michael.Hipp@student.uni-tuebingen.de)
+ *    [feel free to mail ....]
+ *
+ * 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: 0xc8000,0xd0000,0xd4000,0xd8000 (8K and 16K)
+ *
+ * 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.
+ * 
+ * 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 bugs (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? )
+ */
+
+/*
+ * 18.Nov.95: Mcast changes (AC).
+ *
+ * 19.Jan.95: verified (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 
+ */
+ 
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/malloc.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include "ni52.h"
+
+#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 make32(ptr16) (p->memtop + (short) (ptr16) )
+#define make24(ptr32) ((char *) (ptr32) - p->base)
+#define make16(ptr32) ((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 this 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 DELAY(x) {int i=jiffies; \
+                  if(loops_per_sec == 1) \
+                     while(i+(x)>jiffies); \
+                  else \
+                     __delay((loops_per_sec>>5)*x); \
+                 }
+
+/* a much shorter delay: */
+#define DELAY_16(); { __delay( (loops_per_sec>>16)+1 ); }
+
+/* wait for command with timeout: */
+#define WAIT_4_SCB_CMD() { int i; \
+  for(i=0;i<1024;i++) { \
+    if(!p->scb->cmd) break; \
+    DELAY_16(); \
+    if(i == 1023) { \
+      printk("%s: scb_cmd timed out .. resetting i82586\n",dev->name); \
+      ni_reset586(); } } }
+
+
+#define NI52_TOTAL_SIZE 16
+#define NI52_ADDR0 0x02
+#define NI52_ADDR1 0x07
+#define NI52_ADDR2 0x01
+
+#ifndef HAVE_PORTRESERVE
+#define check_region(ioaddr, size)              0
+#define request_region(ioaddr, size,name)    do ; while (0)
+#endif
+
+static int     ni52_probe1(struct device *dev,int ioaddr);
+static void    ni52_interrupt(int irq,struct pt_regs *reg_ptr);
+static int     ni52_open(struct device *dev);
+static int     ni52_close(struct device *dev);
+static int     ni52_send_packet(struct sk_buff *,struct device *);
+static struct  enet_statistics *ni52_get_stats(struct device *dev);
+static void    set_multicast_list(struct device *dev);
+
+/* helper-functions */
+static int     init586(struct device *dev);
+static int     check586(struct device *dev,char *where,unsigned size);
+static void    alloc586(struct device *dev);
+static void    startrecv586(struct device *dev);
+static void   *alloc_rfa(struct device *dev,void *ptr);
+static void    ni52_rcv_int(struct device *dev);
+static void    ni52_xmt_int(struct device *dev);
+static void    ni52_rnr_int(struct device *dev);
+
+struct priv
+{
+  struct enet_statistics stats;
+  unsigned long base;
+  char *memtop;
+  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 ni52_close(struct device *dev)
+{
+  free_irq(dev->irq);
+  irq2dev_map[dev->irq] = 0;
+
+  ni_reset586(); /* the hard way to stop the receiver */
+
+  dev->start = 0;
+  dev->tbusy = 0;
+
+  return 0;
+}
+
+/**********************************************
+ * open device 
+ */
+
+static int ni52_open(struct device *dev)
+{
+  alloc586(dev);
+  init586(dev);  
+  startrecv586(dev);
+
+  if(request_irq(dev->irq, &ni52_interrupt,0,"ni52")) 
+  {    
+    ni_reset586();
+    return -EAGAIN;
+  }  
+  irq2dev_map[dev->irq] = dev;
+
+  dev->interrupt = 0;
+  dev->tbusy = 0;
+  dev->start = 1;
+
+  return 0; /* most done by init */
+}
+
+/**********************************************
+ * Check to see if there's an 82586 out there. 
+ */
+
+static int check586(struct device *dev,char *where,unsigned size)
+{
+  struct priv *p = (struct priv *) dev->priv;
+  char *iscp_addrs[2];
+  int i;
+
+  p->base = (unsigned long) where + size - 0x01000000;
+  p->memtop = where + size;
+  p->scp = (struct scp_struct *)(p->base + SCP_DEFAULT_ADDRESS);
+  memset((char *)p->scp,0, sizeof(struct scp_struct));
+  p->scp->sysbus = SYSBUSVAL;        /* 1 = 8Bit-Bus, 0 = 16 Bit */
+  
+  iscp_addrs[0] = where;
+  iscp_addrs[1]= (char *) p->scp - sizeof(struct iscp_struct);
+
+  for(i=0;i<2;i++)
+  {
+    p->iscp = (struct iscp_struct *) iscp_addrs[i];
+    memset((char *)p->iscp,0, sizeof(struct iscp_struct));
+
+    p->scp->iscp = make24(p->iscp);
+    p->iscp->busy = 1;
+
+    ni_reset586();
+    ni_attn586();
+    DELAY(2);	/* 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 ni52_probe1 and open586. 
+ */
+
+void alloc586(struct device *dev)
+{
+  struct priv *p =  (struct priv *) dev->priv; 
+
+  ni_reset586();
+  DELAY(2);
+
+  p->scp  = (struct scp_struct *)  (p->base + SCP_DEFAULT_ADDRESS);
+  p->scb  = (struct scb_struct *)  (dev->mem_start);
+  p->iscp = (struct iscp_struct *) ((char *)p->scp - 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->busy = 1;
+  ni_reset586();
+  ni_attn586();
+
+  DELAY(2); 
+
+  if(p->iscp->busy)
+    printk("%s: Init-Problems (alloc).\n",dev->name);
+
+  memset((char *)p->scb,0,sizeof(struct scb_struct));
+}
+
+/**********************************************
+ * probe the ni5210-card
+ */
+
+int ni52_probe(struct device *dev)
+{
+  int *port, ports[] = {0x300, 0x280, 0x360 , 0x320 , 0x340, 0};
+  int base_addr = dev->base_addr;
+
+  if (base_addr > 0x1ff)		/* Check a single specified location. */
+    if( (inb(base_addr+NI52_MAGIC1) == NI52_MAGICVAL1) &&
+        (inb(base_addr+NI52_MAGIC2) == NI52_MAGICVAL2))
+      return ni52_probe1(dev, base_addr);
+  else if (base_addr > 0)		/* Don't probe at all. */
+    return ENXIO;
+
+  for (port = ports; *port; port++) {
+    int ioaddr = *port;
+    if (check_region(ioaddr, NI52_TOTAL_SIZE))
+      continue;
+    if( !(inb(ioaddr+NI52_MAGIC1) == NI52_MAGICVAL1) || 
+        !(inb(ioaddr+NI52_MAGIC2) == NI52_MAGICVAL2))
+      continue;
+
+    dev->base_addr = ioaddr;
+    if (ni52_probe1(dev, ioaddr) == 0)
+      return 0;
+  }
+
+  dev->base_addr = base_addr;
+  return ENODEV;
+}
+
+static int ni52_probe1(struct device *dev,int ioaddr)
+{
+  long memaddrs[] = { 0xd0000,0xd2000,0xc8000,0xca000,0xd4000,0xd6000,0xd8000, 0 };
+  int i,size;
+
+  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)
+    return ENODEV;
+
+  printk("%s: Ni52 found at %#3lx, ",dev->name,dev->base_addr);
+
+  request_region(ioaddr,NI52_TOTAL_SIZE,"ni52");
+
+  dev->priv = (void *) kmalloc(sizeof(struct priv),GFP_KERNEL); 
+                                  /* warning: we don't free it on errors */
+  if (dev->priv == NULL)
+     return -ENOMEM;
+  memset((char *) dev->priv,0,sizeof(struct priv));
+
+  /* 
+   * check (or search) IO-Memory, 8K and 16K
+   */
+  if(dev->mem_start != 0) /* no auto-mem-probe */
+  {
+    size = 0x4000; /* check for 16K mem */
+    if(!check586(dev,(char *) dev->mem_start,size)) {
+      size = 0x2000; /* check for 8K mem */
+      if(!check586(dev,(char *) dev->mem_start,size)) {
+        printk("?memprobe, Can't find memory at 0x%lx!\n",dev->mem_start);
+        return ENODEV;
+      }
+    }
+  }
+  else  
+  {
+    for(i=0;;i++)
+    {
+      if(!memaddrs[i]) {
+        printk("?memprobe, Can't find io-memory!\n");
+        return ENODEV;
+      }
+      dev->mem_start = memaddrs[i];
+      size = 0x2000; /* check for 8K mem */
+      if(check586(dev,(char *)dev->mem_start,size)) /* 8K-check */
+        break;
+      size = 0x4000; /* check for 16K mem */
+      if(check586(dev,(char *)dev->mem_start,size)) /* 16K-check */
+        break;
+    }
+  }
+  dev->mem_end = dev->mem_start + size; /* set mem_end showed by 'ifconfig' */
+  
+  ((struct priv *) (dev->priv))->base =  dev->mem_start + size - 0x01000000;
+  alloc586(dev);
+
+  /* set number of receive-buffs according to memsize */
+  if(size == 0x2000)
+    ((struct priv *) dev->priv)->num_recv_buffs = NUM_RECV_BUFFS_8;
+  else
+    ((struct priv *) dev->priv)->num_recv_buffs = NUM_RECV_BUFFS_16;
+
+  printk("Memaddr: 0x%lx, Memsize: %d, ",dev->mem_start,size);
+
+  if(dev->irq < 2)
+  {
+    autoirq_setup(0);
+    ni_reset586();
+    ni_attn586();
+    if(!(dev->irq = autoirq_report(2)))
+    {
+      printk("?autoirq, Failed to detect IRQ line!\n"); 
+      return 1;
+    }
+  }
+  else if(dev->irq == 2) 
+    dev->irq = 9;
+
+  printk("IRQ %d.\n",dev->irq);
+
+  dev->open            = &ni52_open;
+  dev->stop            = &ni52_close;
+  dev->get_stats       = &ni52_get_stats;
+  dev->hard_start_xmit = &ni52_send_packet;
+  dev->set_multicast_list = &set_multicast_list;
+
+  dev->if_port 	       = 0;
+
+  ether_setup(dev);
+
+  dev->tbusy = 0;
+  dev->interrupt = 0;
+  dev->start = 0;
+  
+  return 0;
+}
+
+/********************************************** 
+ * init the chip (ni52-interrupt should be disabled?!)
+ * needs a correct 'allocated' memory
+ */
+
+static int init586(struct device *dev)
+{
+  void *ptr;
+  unsigned long s;
+  int i,result=0;
+  struct priv *p = (struct priv *) dev->priv;
+  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 dev_mc_list *dmi=dev->mc_list;
+  int num_addrs=dev->mc_count;
+
+  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    = CMD_CONFIGURE | CMD_LAST;
+  cfg_cmd->cmd_link   = 0xffff;
+
+  cfg_cmd->byte_cnt   = 0x0a; /* number of cfg bytes */
+  cfg_cmd->fifo       = 0x08; /* 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|IFF_PROMISC))
+  {
+	cfg_cmd->promisc=1;
+	dev->flags|=IFF_PROMISC;
+  }
+  cfg_cmd->carr_coll  = 0x00;
+ 
+  p->scb->cbl_offset = make16(cfg_cmd);
+
+  p->scb->cmd = CUC_START; /* cmd.-unit start */
+  ni_attn586();
+ 
+  s = jiffies; /* warning: only active with interrupts on !! */
+  while(!(cfg_cmd->cmd_status & STAT_COMPL)) 
+    if(jiffies-s > 30) break;
+
+  if((cfg_cmd->cmd_status & (STAT_OK|STAT_COMPL)) != (STAT_COMPL|STAT_OK))
+  {
+    printk("%s (ni52): configure command failed: %x\n",dev->name,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    = 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_START; /* cmd.-unit start */
+  ni_attn586();
+
+  s = jiffies;
+  while(!(ias_cmd->cmd_status & STAT_COMPL)) 
+    if(jiffies-s > 30) break;
+
+  if((ias_cmd->cmd_status & (STAT_OK|STAT_COMPL)) != (STAT_OK|STAT_COMPL)) {
+    printk("%s (ni52): individual address setup command failed: %04x\n",dev->name,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     = CMD_TDR | CMD_LAST;
+  tdr_cmd->cmd_link    = 0xffff;
+  tdr_cmd->status      = 0;
+
+  p->scb->cbl_offset = make16(tdr_cmd);
+
+  p->scb->cmd = CUC_START; /* cmd.-unit start */
+  ni_attn586();
+
+  s = jiffies; 
+  while(!(tdr_cmd->cmd_status & STAT_COMPL))
+    if(jiffies - s > 30) {
+      printk("%s: Problems while running the TDR.\n",dev->name);
+      result = 1;
+    }
+
+  if(!result)
+  {
+    DELAY(2); /* wait for result */
+    result = tdr_cmd->status;
+
+    p->scb->cmd = p->scb->status & STAT_MASK;
+    ni_attn586(); /* ack the interrupts */
+
+    if(result & TDR_LNK_OK) ;
+    else if(result & TDR_XCVR_PRB)
+      printk("%s: TDR: Transceiver problem!\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);
+  }
+ 
+   /* 
+    * ack interrupts 
+    */
+  p->scb->cmd = p->scb->status & STAT_MASK;
+  ni_attn586();
+
+   /*
+    * 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    = 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);
+  }
+  p->xmit_cmds[0] = (struct transmit_cmd_struct *)ptr; /* transmit cmd/buff 0 */
+  ptr = (char *) ptr + sizeof(struct transmit_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    = 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);
+    p->xmit_cmds[i] = (struct transmit_cmd_struct *)ptr; /*transmit cmd/buff 0*/
+    ptr = (char *) ptr + sizeof(struct transmit_cmd_struct);
+  }
+#endif
+
+  ptr = alloc_rfa(dev,(void *)ptr); /* init receive-frame-area */ 
+
+  /* 
+   * Multicast setup
+   */
+  
+  if(dev->mc_count)
+  { /* I don't understand this: do we really need memory after the init? */
+    int len = ((char *) p->iscp - (char *) ptr - 8) / 6;
+    if(len <= 0)
+    {
+      printk("%s: Ooooops, no memory for MC-Setup!\n",dev->name);
+    }
+    else
+    {
+      if(len < num_addrs)
+      {
+      	/* BUG - should go ALLMULTI in this case */
+        num_addrs = len;
+        printk("%s: Sorry, can only apply %d MC-Address(es).\n",dev->name,num_addrs);
+      }
+      mc_cmd = (struct mcsetup_cmd_struct *) ptr;
+      mc_cmd->cmd_status = 0;
+      mc_cmd->cmd_cmd = CMD_MCSETUP | CMD_LAST;
+      mc_cmd->cmd_link = 0xffff;
+      mc_cmd->mc_cnt = num_addrs * 6;
+      for(i=0;i<num_addrs;i++)
+      {
+		memcpy((char *) mc_cmd->mc_list[i], dmi->dmi_addr,6);
+		dmi=dmi->next;
+      }
+      p->scb->cbl_offset = make16(mc_cmd);
+      p->scb->cmd = CUC_START;
+      ni_attn586();
+      s = jiffies;
+      while(!(mc_cmd->cmd_status & STAT_COMPL))
+        if(jiffies - s > 30)
+          break;
+      if(!(mc_cmd->cmd_status & STAT_COMPL))
+        printk("%s: Can't apply multicast-address-list.\n",dev->name);
+    }
+  }
+
+  /*
+   * alloc xmit-buffs / init xmit_cmds
+   */
+  for(i=0;i<NUM_XMIT_BUFFS;i++)
+  {
+    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((void *)ptr > (void *)p->iscp) 
+    {
+      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_status = STAT_COMPL;
+    p->xmit_cmds[i]->cmd_cmd = 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' (nop-loop)
+    */
+#ifndef NO_NOPCOMMANDS
+  p->scb->cbl_offset = make16(p->nop_cmds[0]);
+  p->scb->cmd = CUC_START;
+  ni_attn586();
+  WAIT_4_SCB_CMD();
+#else
+  p->xmit_cmds[0]->cmd_link = 0xffff;
+  p->xmit_cmds[0]->cmd_cmd  = CMD_XMIT | CMD_LAST | CMD_INT;
+#endif
+
+  return 0;
+}
+
+/******************************************************
+ * This is a helper routine for ni52_rnr_int() and init586(). 
+ * It sets up the Receive Frame Area (RFA).
+ */
+
+static void *alloc_rfa(struct device *dev,void *ptr) 
+{
+  volatile struct rfd_struct *rfd = (struct rfd_struct *)ptr;
+  volatile struct rbd_struct *rbd;
+  int i;
+  struct priv *p = (struct priv *) dev->priv;
+
+  memset((char *) rfd,0,sizeof(struct rfd_struct)*p->num_recv_buffs);
+  p->rfd_first = rfd;
+
+  for(i = 0; i < p->num_recv_buffs; i++)
+    rfd[i].next = make16(rfd + (i+1) % p->num_recv_buffs);
+  rfd[p->num_recv_buffs-1].last = RFD_SUSP;   /* RU suspend */
+
+  ptr = (void *) (rfd + p->num_recv_buffs);
+
+  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 = 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;
+
+  p->scb->rfa_offset		= make16(p->rfd_first);
+  p->rfd_first->rbd_offset	= make16(rbd);
+
+  return ptr;
+}
+
+
+/**************************************************
+ * Interrupt Handler ...
+ */
+
+static void ni52_interrupt(int irq,struct pt_regs *reg_ptr)
+{
+  struct device *dev = (struct device *) irq2dev_map[irq];
+  unsigned short stat;
+  struct priv *p;
+
+  if (dev == NULL) {
+    printk ("ni52-interrupt: irq %d for unknown device.\n",(int) -(((struct pt_regs *)reg_ptr)->orig_eax+2));
+    return;
+  }
+  p = (struct priv *) dev->priv;
+
+  dev->interrupt = 1;
+
+  while((stat=p->scb->status & STAT_MASK))
+  {
+    p->scb->cmd = stat;
+    ni_attn586(); /* ack inter. */
+
+   if(stat & STAT_CX)    /* command with I-bit set complete */
+      ni52_xmt_int(dev);
+
+    if(stat & STAT_FR)   /* received a frame */
+      ni52_rcv_int(dev);
+
+#ifndef NO_NOPCOMMANDS
+    if(stat & STAT_CNA)  /* CU went 'not ready' */
+    {
+      if(dev->start)
+        printk("%s: oops! CU has left active state. stat: %04x/%04x.\n",dev->name,(int) stat,(int) p->scb->status);
+    }
+#endif
+
+    if(stat & STAT_RNR) /* RU went 'not ready' */
+    {
+      if(p->scb->status & RU_SUSPEND) /* special case: RU_SUSPEND */
+      {
+        WAIT_4_SCB_CMD();
+        p->scb->cmd = RUC_RESUME;
+        ni_attn586();
+      }
+      else
+      {
+        printk("%s: Receiver-Unit went 'NOT READY': %04x/%04x.\n",dev->name,(int) stat,(int) p->scb->status);
+        ni52_rnr_int(dev); 
+      }
+    }
+    WAIT_4_SCB_CMD(); /* wait for ack. (ni52_xmt_int can be faster than ack!!) */
+    if(p->scb->cmd)   /* timed out? */
+      break;
+  }
+
+  dev->interrupt = 0;
+}
+
+/*******************************************************
+ * receive-interrupt
+ */
+
+static void ni52_rcv_int(struct device *dev)
+{
+  int status;
+  unsigned short totlen;
+  struct sk_buff *skb;
+  struct rbd_struct *rbd;
+  struct priv *p = (struct priv *) dev->priv;
+
+  for(;(status = p->rfd_top->status) & STAT_COMPL;)
+  {
+      rbd = (struct rbd_struct *) make32(p->rfd_top->rbd_offset);
+
+      if(status & STAT_OK) /* frame received without error? */
+      {
+        if( (totlen = rbd->status) & RBD_LAST) /* the first and the last buffer? */
+        {
+          totlen &= RBD_MASK; /* length of this frame */
+          rbd->status = 0;
+          skb = (struct sk_buff *) dev_alloc_skb(totlen+2);
+          if(skb != NULL)
+          {
+            skb->dev = dev;
+            skb_reserve(skb,2);		/* 16 byte alignment */
+            memcpy(skb_put(skb,totlen),(char *) p->base+(unsigned long) rbd->buffer, totlen);
+            skb->protocol=eth_type_trans(skb,dev);
+            netif_rx(skb);
+            p->stats.rx_packets++;
+          }
+          else
+            p->stats.rx_dropped++;
+        }
+        else
+        {
+          printk("%s: received oversized frame.\n",dev->name);
+          p->stats.rx_dropped++;
+        }
+      }
+      else /* frame !(ok), only with 'save-bad-frames' */
+      {
+        printk("%s: oops! rfd-error-status: %04x\n",dev->name,status);
+        p->stats.rx_errors++;
+      }
+      p->rfd_top->status = 0;
+      p->rfd_top->last = RFD_SUSP;
+      p->rfd_last->last = 0;        /* delete RU_SUSP  */
+      p->rfd_last = p->rfd_top;
+      p->rfd_top = (struct rfd_struct *) make32(p->rfd_top->next); /* step to next RFD */
+  }
+}
+
+/**********************************************************
+ * handle 'Receiver went not ready'. 
+ */
+
+static void ni52_rnr_int(struct device *dev)
+{
+  struct priv *p = (struct priv *) dev->priv;
+
+  p->stats.rx_errors++;
+
+  WAIT_4_SCB_CMD();    /* wait for the last cmd */
+  p->scb->cmd = RUC_ABORT; /* usually the RU is in the 'no resource'-state .. abort it now. */
+  ni_attn586(); 
+  WAIT_4_SCB_CMD();    /* wait for accept cmd. */
+
+  alloc_rfa(dev,(char *)p->rfd_first);
+  startrecv586(dev); /* restart RU */
+
+  printk("%s: Receive-Unit restarted. Status: %04x\n",dev->name,p->scb->status);
+
+}
+
+/**********************************************************
+ * handle xmit - interrupt
+ */
+
+static void ni52_xmt_int(struct device *dev)
+{
+  int status;
+  struct priv *p = (struct priv *) dev->priv;
+
+  status = 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)
+  {
+    p->stats.tx_packets++;
+    p->stats.collisions += (status & TCMD_MAXCOLLMASK);
+  }
+  else 
+  {
+    p->stats.tx_errors++;
+    if(status & TCMD_LATECOLL) {
+      printk("%s: late collision detected.\n",dev->name);
+      p->stats.collisions++;
+    } 
+    else if(status & TCMD_NOCARRIER) {
+      p->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) {
+      p->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);
+      p->stats.collisions += 16;
+    } 
+  }
+
+#if (NUM_XMIT_BUFFS != 1)
+  if( (++p->xmit_last) == NUM_XMIT_BUFFS) 
+    p->xmit_last = 0;
+#endif
+
+  dev->tbusy = 0;
+  mark_bh(NET_BH);
+}
+
+/***********************************************************
+ * (re)start the receiver
+ */ 
+
+static void startrecv586(struct device *dev)
+{
+  struct priv *p = (struct priv *) dev->priv;
+
+  p->scb->rfa_offset = make16(p->rfd_first);
+  p->scb->cmd = RUC_START;
+  ni_attn586();		/* start cmd. */
+  WAIT_4_SCB_CMD();	/* wait for accept cmd. (no timeout!!) */
+}
+
+/******************************************************
+ * send frame 
+ */
+
+static int ni52_send_packet(struct sk_buff *skb, struct device *dev)
+{
+  int len,i;
+#ifndef NO_NOPCOMMANDS
+  int next_nop;
+#endif
+  struct priv *p = (struct priv *) dev->priv;
+
+  if(dev->tbusy)
+  {
+    int tickssofar = jiffies - dev->trans_start;
+    if (tickssofar < 5)
+      return 1;
+
+    if(p->scb->status & CU_ACTIVE) /* COMMAND-UNIT active? */
+    {
+      dev->tbusy = 0;
+#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)p->xmit_cmds[0]->cmd_status,(int)p->nop_cmds[0]->cmd_status,(int)p->nop_cmds[1]->cmd_status,(int)p->nop_point);
+#endif
+      p->scb->cmd = CUC_ABORT;
+      ni_attn586();
+      WAIT_4_SCB_CMD();
+      p->scb->cbl_offset = make16(p->nop_cmds[p->nop_point]);
+      p->scb->cmd = CUC_START;
+      ni_attn586();
+      WAIT_4_SCB_CMD();
+      dev->trans_start = jiffies;
+      return 0;
+    }
+    else
+    {
+#ifdef DEBUG
+      printk("%s: xmitter timed out, try to restart! stat: %04x\n",dev->name,p->scb->status);
+      printk("%s: command-stats: %04x %04x\n",dev->name,p->xmit_cmds[0]->cmd_status,p->xmit_cmds[1]->cmd_status);
+#endif
+      ni52_close(dev);
+      ni52_open(dev);
+    }
+    dev->trans_start = jiffies;
+    return 0;
+  }
+
+  if(skb == NULL)
+  {
+    dev_tint(dev);
+    return 0;
+  }
+
+  if (skb->len <= 0)
+    return 0;
+  if(skb->len > XMIT_BUFF_SIZE)
+  {
+    printk("%s: Sorry, max. framelength is %d bytes. The length of your frame is %ld bytes.\n",dev->name,XMIT_BUFF_SIZE,skb->len);
+    return 0;
+  }
+
+  if (set_bit(0, (void*)&dev->tbusy) != 0)
+     printk("%s: Transmitter access conflict.\n", dev->name);
+  else
+  {
+    memcpy((char *)p->xmit_cbuffs[p->xmit_count],(char *)(skb->data),skb->len);
+    len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
+
+#if (NUM_XMIT_BUFFS == 1)
+#  ifdef NO_NOPCOMMANDS
+    p->xmit_buffs[0]->size = TBD_LAST | len;
+    for(i=0;i<16;i++)
+    {
+      p->scb->cbl_offset = make16(p->xmit_cmds[0]);
+      p->scb->cmd = CUC_START;
+      p->xmit_cmds[0]->cmd_status = 0;
+
+      ni_attn586();
+      dev->trans_start = jiffies;
+      if(!i)
+        dev_kfree_skb(skb,FREE_WRITE);
+      WAIT_4_SCB_CMD();
+      if( (p->scb->status & 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 = 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]));
+    dev->trans_start = jiffies;
+    p->nop_point = next_nop;
+    dev_kfree_skb(skb,FREE_WRITE);
+#  endif
+#else
+    p->xmit_buffs[p->xmit_count]->size = 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;
+    p->xmit_cmds[p->xmit_count]->cmd_link = 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]));
+    dev->trans_start = jiffies;
+    p->xmit_count = next_nop;
+  
+    cli();
+    if(p->xmit_count != p->xmit_last)
+      dev->tbusy = 0;
+    sti();
+    dev_kfree_skb(skb,FREE_WRITE);
+#endif
+  }
+  return 0;
+}
+
+/*******************************************
+ * Someone wanna have the statistics 
+ */
+
+static struct enet_statistics *ni52_get_stats(struct device *dev)
+{
+  struct priv *p = (struct priv *) dev->priv;
+  unsigned short crc,aln,rsc,ovrn;
+
+  crc = p->scb->crc_errs; /* get error-statistic from the ni82586 */
+  p->scb->crc_errs -= crc;
+  aln = p->scb->aln_errs;
+  p->scb->aln_errs -= aln;
+  rsc = p->scb->rsc_errs;
+  p->scb->rsc_errs -= rsc;
+  ovrn = p->scb->ovrn_errs;
+  p->scb->ovrn_errs -= ovrn;
+
+  p->stats.rx_crc_errors += crc;
+  p->stats.rx_fifo_errors += ovrn;
+  p->stats.rx_frame_errors += aln;
+  p->stats.rx_dropped += rsc;
+
+  return &p->stats;
+}
+
+/********************************************************
+ * Set MC list ..  
+ */
+
+static void set_multicast_list(struct device *dev)
+{
+  if(!dev->start)
+  {
+    printk("%s: Can't apply promiscuous/multicastmode to a not running interface.\n",dev->name);
+    return;
+  }
+
+  dev->start = 0;
+  alloc586(dev);
+  init586(dev);  
+  startrecv586(dev);
+  dev->start = 1;
+}
+
+/*
+ * END: linux/drivers/net/ni52.c 
+ */