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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: Michael.Hipp@student.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)

 */

/*

 * 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 <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 enet_statistics 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 enet_statistics *ni65_get_stats(struct device *);

static void set_multicast_list(struct device *dev);

static int irqtab[] = { 9,12,15,5 }; /* irq config-translate */

static int dmatab[] = { 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,NULL);

  if (irqval) {

    printk ("%s: unable to get IRQ %d (irqval=%d).\n",

              dev->name,dev->irq, irqval);

    return -EAGAIN;

  }

  irq2dev_map[dev->irq] = dev;

  if(ni65_lance_reinit(dev))

  {

    dev->tbusy     = 0;

    dev->interrupt = 0;

    dev->start     = 1;

    MOD_INC_USE_COUNT;

    return 0;

  }

  else

  {

    irq2dev_map[dev->irq] = NULL;

    free_irq(dev->irq,NULL);

    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],FREE_WRITE);

        p->tmd_skb[i] = NULL;

      }

    }

  }

#endif

  irq2dev_map[dev->irq] = NULL;

  free_irq(dev->irq,NULL);

  dev->tbusy = 1;

  dev->start = 0;

  MOD_DEC_USE_COUNT;

  return 0;

}

/*

 * Probe The Card (not the lance-chip)

 */

#ifdef MODULE

static

#endif

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 ..

 */

static int ni65_probe1(struct device *dev,int ioaddr)

{

  int i,j;

  struct priv *p;

  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;

        disable_dma(dma);

        set_dma_mode(dma,DMA_MODE_CASCADE);

        enable_dma(dma);

        ni65_init_lance(p,dev->dev_addr,0,0); /* trigger memory access */

        disable_dma(dma);

        free_dma(dma);

        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++)

  {

    udelay(4000);

    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,FREE_WRITE);

    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],FREE_WRITE);

#endif

  }

  for(i=0;i<RMDNUM;i++)

  {

#ifdef RCV_VIA_SKB

    if(p->recv_skb[i])

      dev_kfree_skb(p->recv_skb[i],FREE_WRITE);

#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;