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ni65.c

/*
 * 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 <linux/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;
      unsigned 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);
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;
}

static void cleanup_card(struct net_device *dev)
{
      struct priv *p = (struct priv *) dev->priv;
      disable_dma(dev->dma);
      free_dma(dev->dma);
      release_region(dev->base_addr, cards[p->cardno].total_size);
      ni65_free_buffer(p);
}

/* set: io,irq,dma or set it when calling insmod */
static int irq;
static int io;
static int dma;

/*
 * Probe The Card (not the lance-chip)
 */
struct net_device * __init ni65_probe(int unit)
{
      struct net_device *dev = alloc_etherdev(0);
      static int ports[] = {0x360,0x300,0x320,0x340, 0};
      int *port;
      int err = 0;

      if (!dev)
            return ERR_PTR(-ENOMEM);

      if (unit >= 0) {
            sprintf(dev->name, "eth%d", unit);
            netdev_boot_setup_check(dev);
            irq = dev->irq;
            dma = dev->dma;
      } else {
            dev->base_addr = io;
      }

      if (dev->base_addr > 0x1ff) { /* Check a single specified location. */
            err = ni65_probe1(dev, dev->base_addr);
      } else if (dev->base_addr > 0) { /* Don't probe at all. */
            err = -ENXIO;
      } else {
            for (port = ports; *port && ni65_probe1(dev, *port); port++)
                  ;
            if (!*port)
                  err = -ENODEV;
      }
      if (err)
            goto out;

      err = register_netdev(dev);
      if (err)
            goto out1;
      return dev;
out1:
      cleanup_card(dev);
out:
      free_netdev(dev);
      return ERR_PTR(err);
}

/*
 * 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;

      dev->irq = irq;
      dev->dma = dma;

      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 */
                  msleep(20);
                  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;
      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;
      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_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++) {
            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
            kfree(p->recvbounce[i]);
#endif
      }
      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)
{
      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);
#ifdef RCV_VIA_SKB
                        if( (unsigned long) (skb->data + R_BUF_SIZE) > 0x1000000) {
                              skb_put(skb,len);
                              skb_copy_to_linear_data(skb, (unsigned char *)(p->recv_skb[p->rmdnum]->data),len);
                        }
                        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);
                        skb_copy_to_linear_data(skb, (unsigned char *) p->recvbounce[p->rmdnum],len);
#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

                  skb_copy_from_linear_data(skb, p->tmdbounce[p->tmdbouncenum],
                              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;

module_param(irq, int, 0);
module_param(io, int, 0);
module_param(dma, int, 0);
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 init_module(void)
{
      dev_ni65 = ni65_probe(-1);
      return IS_ERR(dev_ni65) ? PTR_ERR(dev_ni65) : 0;
}

void __exit cleanup_module(void)
{
      unregister_netdev(dev_ni65);
      cleanup_card(dev_ni65);
      free_netdev(dev_ni65);
}
#endif /* MODULE */

MODULE_LICENSE("GPL");

/*
 * END of ni65.c
 */

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