ni65.c

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/*
 * 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 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/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include <linux/version.h>
#include <linux/module.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 char config;
} cards[] = {
        { NI65_ID0,NI65_ID1,0x0e,0x10,0x0,0x8,ni_vendor,"ni6510", 0x1 } ,
        { NI65_EB_ID0,NI65_EB_ID1,0x0e,0x18,0x10,0x0,ni_vendor,"ni6510 EtherBlaster", 0x2 } ,
        { NE2100_ID0,NE2100_ID1,0x0e,0x18,0x10,0x0,NULL,"generic NE2100", 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;
};

static int  ni65_probe1(struct device *dev,int);
static void ni65_interrupt(int irq, void * dev_id, struct pt_regs *regs);
static void ni65_recv_intr(struct device *dev,int);
static void ni65_xmit_intr(struct device *dev,int);
static int  ni65_open(struct device *dev);
static int  ni65_lance_reinit(struct device *dev);
static void ni65_init_lance(struct priv *p,unsigned char*,int,int);
static int  ni65_send_packet(struct sk_buff *skb, struct device *dev);
static int  ni65_close(struct device *dev);
static int  ni65_alloc_buffer(struct device *dev);
static void ni65_free_buffer(struct priv *p);
static struct net_device_stats *ni65_get_stats(struct device *);
static void set_multicast_list(struct 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 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 ("%s: unable to get IRQ %d (irqval=%d).\n",
                          dev->name,dev->irq, irqval);
                return -EAGAIN;
        }

        if(ni65_lance_reinit(dev))
        {
                dev->tbusy     = 0;
                dev->interrupt = 0;
                dev->start     = 1;
                MOD_INC_USE_COUNT;
                return 0;
        }
        else
        {
                free_irq(dev->irq,dev);
                dev->start = 0;
                return -EAGAIN;
        }
}

/*
 * close interface (down)
 */
static int ni65_close(struct device *dev)
{
        struct priv *p = (struct priv *) dev->priv;

        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);
        dev->tbusy = 1;
        dev->start = 0;
        MOD_DEC_USE_COUNT;
        return 0;
}

/*
 * Probe The Card (not the lance-chip)
 */
#ifdef MODULE
static
#endif
__initfunc(int ni65_probe(struct device *dev))
{
        int *port;
        static int ports[] = {0x360,0x300,0x320,0x340, 0};

        if (dev->base_addr > 0x1ff)          /* Check a single specified location. */
                 return ni65_probe1(dev, dev->base_addr);
        else if (dev->base_addr > 0)         /* Don't probe at all. */
                 return -ENXIO;

        for (port = ports; *port; port++)
        {
                if (ni65_probe1(dev, *port) == 0)
                         return 0;
        }

        return -ENODEV;
}

/*
 * this is the real card probe ..
 */
__initfunc(static int ni65_probe1(struct device *dev,int ioaddr))
{
        int i,j;
        struct priv *p;
        unsigned long flags;

        for(i=0;i<NUM_CARDS;i++) {
                if(check_region(ioaddr, cards[i].total_size))
                        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) {
                                 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])
                                        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)
                return j;
        p = (struct priv *) dev->priv;
        p->cmdr_addr = ioaddr + cards[i].cmd_offset;
        p->cardno = i;

        printk("%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(KERN_ERR "can't RESET card: %04x\n",j);
                 ni65_free_buffer(p);
                 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 */
                        int 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("Can't detect DMA channel!\n");
                                ni65_free_buffer(p);
                                return -EAGAIN;
                        }
                        dev->dma = dmatab[i];
                        printk("DMA %d (autodetected), ",dev->dma);
                }
                else
                        printk("DMA %d (assigned), ",dev->dma);

                if(dev->irq < 2)
                {
                        ni65_init_lance(p,dev->dev_addr,0,0);
                        autoirq_setup(0);
                        writereg(CSR0_INIT|CSR0_INEA,CSR0); /* trigger interrupt */

                        if(!(dev->irq = autoirq_report(2)))
                        {
                                printk("Failed to detect IRQ line!\n");
                                ni65_free_buffer(p);
                                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("%s: Can't request dma-channel %d\n",dev->name,(int) dev->dma);
                ni65_free_buffer(p);
                return -EAGAIN;
        }

        /*
         * Grab the region so we can find another board.
         */
        request_region(ioaddr,cards[p->cardno].total_size,cards[p->cardno].cardname);

        dev->base_addr = ioaddr;

        dev->open               = ni65_open;
        dev->stop               = ni65_close;
        dev->hard_start_xmit    = ni65_send_packet;
        dev->get_stats          = ni65_get_stats;
        dev->set_multicast_list = set_multicast_list;

        ether_setup(dev);

        dev->interrupt          = 0;
        dev->tbusy              = 0;
        dev->start              = 0;

        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) virt_to_bus(p->tmdhead) | TMDNUMMASK;
        p->ib.rrp = (u32) virt_to_bus(p->rmdhead) | RMDNUMMASK;
        writereg(0,CSR3);       /* busmaster/no word-swap */
        pib = (u32) 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 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("%s: unable to allocate %s memory.\n",dev->name,what);
                        return NULL;
                }
                skb->dev = dev;
                skb_reserve(skb,2+16);
                skb_put(skb,R_BUF_SIZE);         /* grab the whole space .. (not necessary) */
                ptr = skb->data;
        }
        else {
                ret = ptr = kmalloc(T_BUF_SIZE,GFP_KERNEL | GFP_DMA);
                if(!ret) {
                        printk("%s: unable to allocate %s memory.\n",dev->name,what);
                        return NULL;
                }
        }
        if( (u32) virt_to_bus(ptr+size) > 0x1000000) {
                printk("%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 device *dev)
{
        unsigned char *ptr;
        struct priv *p;
        int i;

        /*
         * we need 8-aligned memory ..
         */
        ptr = ni65_alloc_mem(dev,"BUFFER",sizeof(struct priv)+8,0);
        if(!ptr)
                return -ENOMEM;

        p = dev->priv = (struct priv *) (((unsigned long) ptr + 7) & ~0x7);
        memset((char *) dev->priv,0,sizeof(struct priv));
        p->self = ptr;

        for(i=0;i<TMDNUM;i++)
        {
#ifdef XMT_VIA_SKB
                p->tmd_skb[i] = NULL;
#endif
                p->tmdbounce[i] = ni65_alloc_mem(dev,"XMIT",T_BUF_SIZE,0);
                if(!p->tmdbounce[i]) {
                        ni65_free_buffer(p);
                        return -ENOMEM;
                }
        }

        for(i=0;i<RMDNUM;i++)
        {
#ifdef RCV_VIA_SKB
                p->recv_skb[i] = ni65_alloc_mem(dev,"RECV",R_BUF_SIZE,1);
                if(!p->recv_skb[i]) {
                        ni65_free_buffer(p);
                        return -ENOMEM;
                }
#else
                p->recvbounce[i] = ni65_alloc_mem(dev,"RECV",R_BUF_SIZE,0);
                if(!p->recvbounce[i]) {
                        ni65_free_buffer(p);
                        return -ENOMEM;
                }
#endif
        }

        return 0; /* everything is OK */
}

/*
 * free buffers and private struct
 */
static void ni65_free_buffer(struct priv *p)
{
        int i;

        if(!p)
                return;

        for(i=0;i<TMDNUM;i++) {
                if(p->tmdbounce[i])
                        kfree(p->tmdbounce[i]);
#ifdef XMT_VIA_SKB
                if(p->tmd_skb[i])
                        dev_kfree_skb(p->tmd_skb[i]);
#endif
        }

        for(i=0;i<RMDNUM;i++)
        {
#ifdef RCV_VIA_SKB
                if(p->recv_skb[i])
                        dev_kfree_skb(p->recv_skb[i]);
#else
                if(p->recvbounce[i])
                        kfree(p->recvbounce[i]);
#endif
        }
        if(p->self)
                kfree(p->self);
}


/*
 * stop and (re)start lance .. e.g after an error
 */
static void ni65_stop_start(struct device *dev,struct priv *p)
{
        int csr0 = CSR0_INEA;

        writedatareg(CSR0_STOP);

        if(debuglevel > 1)
                printk("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) 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) 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)
                        dev->tbusy = (p->tmdnum || !p->xmit_queued) ? 0 : 1;
                dev->trans_start = jiffies;
        }
        else
                writedatareg(CSR0_STRT | csr0);
}

/*
 * init lance (write init-values .. init-buffers) (open-helper)
 */
static int ni65_lance_reinit(struct 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) virt_to_bus(p->recv_skb[i]->data);
#else
                 rmdp->u.buffer = (u32) 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 void ni65_interrupt(int irq, void * dev_id, struct pt_regs * regs)
{
        int csr0;
        struct device *dev = dev_id;
        struct priv *p;
        int bcnt = 32;

        if (dev == NULL) {
                printk (KERN_ERR "ni65_interrupt(): irq %d for unknown device.\n", irq);
                return;
        }

        if(test_and_set_bit(0,(int *) &dev->interrupt)) {
                printk("ni65: oops .. interrupt while proceeding interrupt\n");
                return;
        }
        p = (struct priv *) dev->priv;

        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("%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("%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("%s: RX or TX was offline -> restart\n",dev->name);
                ni65_stop_start(dev,p);
        }
        else
                writedatareg(CSR0_INEA);

        dev->interrupt = 0;

        return;
}

/*
 * We have received an Xmit-Interrupt ..
 * send a new packet if necessary
 */
static void ni65_xmit_intr(struct 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(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;
        }
        dev->tbusy = 0;
        mark_bh(NET_BH);
}

/*
 * We have received a packet
 */
static void ni65_recv_intr(struct device *dev,int csr0)
{
        struct rmd *rmdp;
        int rmdstat,len;
        int cnt=0;
        struct priv *p = (struct priv *) dev->priv;

        rmdp = p->rmdhead + p->rmdnum;
        while(!( (rmdstat = rmdp->u.s.status) & RCV_OWN))
        {
                cnt++;
                if( (rmdstat & (RCV_START | RCV_END | RCV_ERR)) != (RCV_START | RCV_END) ) /* error or oversized? */
                {
                        if(!(rmdstat & RCV_ERR)) {
                                if(rmdstat & RCV_START)
                                {
                                        p->stats.rx_length_errors++;
                                        printk(KERN_ERR "%s: recv, packet too long: %d\n",dev->name,rmdp->mlen & 0x0fff);
                                }
                        }
                        else {
                                if(debuglevel > 2)
                                        printk(KERN_ERR "%s: receive-error: %04x, lance-status: %04x/%04x\n",
                                                                        dev->name,(int) rmdstat,csr0,(int) inw(PORT+L_DATAREG) );
                                if(rmdstat & RCV_FRAM)
                                        p->stats.rx_frame_errors++;
                                if(rmdstat & RCV_OFLO)
                                        p->stats.rx_over_errors++;
                                if(rmdstat & RCV_CRC)
                                        p->stats.rx_crc_errors++;
                                if(rmdstat & RCV_BUF_ERR)
                                        p->stats.rx_fifo_errors++;
                        }
                        if(!(csr0 & CSR0_MISS)) /* don't count errors twice */
                                p->stats.rx_errors++;
                }
                else if( (len = (rmdp->mlen & 0x0fff) - 4) >= 60)
                {
#ifdef RCV_VIA_SKB
                        struct sk_buff *skb = alloc_skb(R_BUF_SIZE+2+16,GFP_ATOMIC);
                        if (skb)
                                skb_reserve(skb,16);
#else
                        struct sk_buff *skb = dev_alloc_skb(len+2);
#endif
                        if(skb)
                        {
                                skb_reserve(skb,2);
        skb->dev = dev;
#ifdef RCV_VIA_SKB
                                if( (unsigned long) (skb->data + R_BUF_SIZE) > 0x1000000) {
                                        skb_put(skb,len);
                                        eth_copy_and_sum(skb, (unsigned char *)(p->recv_skb[p->rmdnum]->data),len,0);
                                }
                                else {
                                        struct sk_buff *skb1 = p->recv_skb[p->rmdnum];
                                        skb_put(skb,R_BUF_SIZE);
                                        p->recv_skb[p->rmdnum] = skb;
                                        rmdp->u.buffer = (u32) virt_to_bus(skb->data);
                                        skb = skb1;
                                        skb_trim(skb,len);
                                }
#else
                                skb_put(skb,len);
                                eth_copy_and_sum(skb, (unsigned char *) p->recvbounce[p->rmdnum],len,0);
#endif
                                p->stats.rx_packets++;
                                p->stats.rx_bytes += len;
                                skb->protocol=eth_type_trans(skb,dev);
                                netif_rx(skb);
                        }
                        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 int ni65_send_packet(struct sk_buff *skb, struct device *dev)
{
        struct priv *p = (struct priv *) dev->priv;

        if(dev->tbusy)
        {
                int tickssofar = jiffies - dev->trans_start;
                if (tickssofar < 50)
                        return 1;

                printk(KERN_ERR "%s: xmitter timed out, try to restart!\n",dev->name);
                {
                        int i;
                        for(i=0;i<TMDNUM;i++)
                                printk("%02x ",p->tmdhead[i].u.s.status);
                        printk("\n");
                }
                ni65_lance_reinit(dev);
                dev->tbusy=0;
                dev->trans_start = jiffies;
        }

        if (test_and_set_bit(0, (void*)&dev->tbusy) != 0) {
                 printk(KERN_ERR "%s: Transmitter access conflict.\n", dev->name);
                 return 1;
        }
        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;
                long flags;

#ifdef XMT_VIA_SKB
                if( (unsigned long) (skb->data + skb->len) > 0x1000000) {
#endif

                        memcpy((char *) p->tmdbounce[p->tmdbouncenum] ,(char *)skb->data,
                                                         (skb->len > T_BUF_SIZE) ? T_BUF_SIZE : skb->len);
                        if(len > skb->len)
                                memset((char *)p->tmdbounce[p->tmdbouncenum]+skb->len, 0, len-skb->len);
                        dev_kfree_skb (skb);

                        save_flags(flags);
                        cli();

                        tmdp = p->tmdhead + p->tmdnum;
                        tmdp->u.buffer = (u32) virt_to_bus(p->tmdbounce[p->tmdbouncenum]);
                        p->tmdbouncenum = (p->tmdbouncenum + 1) & (TMDNUM - 1);

#ifdef XMT_VIA_SKB
                }
                else {
                        save_flags(flags);
                        cli();

                        tmdp = p->tmdhead + p->tmdnum;
                        tmdp->u.buffer = (u32) 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);

                dev->tbusy = (p->tmdnum == p->tmdlast) ? 1 : 0;
                p->lock = 0;
                dev->trans_start = jiffies;

                restore_flags(flags);
        }

        return 0;
}

static struct net_device_stats *ni65_get_stats(struct 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 device *dev)
{
        if(!ni65_lance_reinit(dev))
                printk(KERN_ERR