drivers/net/ni65.c

/* */
This source file includes following definitions.
ni65_open
ni65_close
ni65_probe
ni65_init
ni65_probe1
ni65_am7990_reinit
ni65_interrupt
ni65_xmit_intr
ni65_recv_intr
ni65_send_packet
ni65_get_stats
set_multicast_list
   1 /*
   2  * ni6510 (am7990 'lance' chip) driver for Linux-net-3 by MH
   3  * Alphacode v0.51 (96/02/20) for 1.3.66 (or later)
   4  *
   5  * copyright (c) 1994,1995,1996 by M.Hipp
   6  *
   7  * This is an extension to the Linux operating system, and is covered by the
   8  * same Gnu Public License that covers the Linux-kernel.
   9  *
  10  * comments/bugs/suggestions can be sent to:
  11  *   Michael Hipp
  12  *   email: Michael.Hipp@student.uni-tuebingen.de
  13  *
  14  * sources:
  15  *   some things are from the 'ni6510-packet-driver for dos by Russ Nelson'
  16  *   and from the original drivers by D.Becker
  17  *
  18  * known problems:
  19  *   on some PCI boards (including my own) the card/board/ISA-bridge has
  20  *   problems with bus master DMA. This results in lotsa overruns.
  21  *   It may help to '#define RCV_PARANOIA_CHECK'
  22  *   or just play with your BIOS options to optimize ISA-DMA access.
  23  *
  24  * credits:
  25  *   thanx to Jason Sullivan for sending me a ni6510 card!
  26  *
  27  * simple performance test:
  28  *   8.1 seconds for getting a 8MB file via FTP -> near 1MB/s
  29  */
  30 
  31 /*
  32  * 96.Feb.19: fixed a few bugs .. cleanups .. tested for 1.3.66
  33  *            hopefully no more 16MB limit
  34  *
  35  * 95.Nov.18: multicast tweaked (AC).
  36  *
  37  * 94.Aug.22: changes in xmit_intr (ack more than one xmitted-packet), ni65_send_packet (p->lock) (MH)
  38  *
  39  * 94,July.16: fixed bugs in recv_skb and skb-alloc stuff  (MH)
  40  */
  41 
  42 #include <linux/kernel.h>
  43 #include <linux/sched.h>
  44 #include <linux/string.h>
  45 #include <linux/ptrace.h>
  46 #include <linux/errno.h>
  47 #include <linux/ioport.h>
  48 #include <linux/malloc.h>
  49 #include <linux/interrupt.h>
  50 #include <linux/delay.h>
  51 #include <asm/bitops.h>
  52 #include <asm/io.h>
  53 #include <asm/dma.h>
  54 
  55 #include <linux/netdevice.h>
  56 #include <linux/etherdevice.h>
  57 #include <linux/skbuff.h>
  58 
  59 #include "ni65.h"
  60 
  61 /*
  62  * the current setting allows max. perforamnce
  63  * for 'RCV_PARANOIA_CHECK' read the 'known problems' part in 
  64  * the header of this file
  65  */
  66 #define RCV_VIA_SKB
  67 #undef RCV_PARANOIA_CHECK
  68 #define XMT_VIA_SKB
  69 
  70 /*
  71  * a few card specific defines
  72  */
  73 #define NI65_TOTAL_SIZE    16
  74 #define NI65_ADDR0 0x02
  75 #define NI65_ADDR1 0x07
  76 #define NI65_ADDR2 0x01
  77 #define NI65_ID0   0x00
  78 #define NI65_ID1   0x55
  79 
  80 #define PORT dev->base_addr
  81 
  82 /*
  83  * buffer configuration
  84  */
  85 #define RMDNUM 8
  86 #define RMDNUMMASK 0x60000000 /* log2(RMDNUM)<<29 */
  87 #define TMDNUM 4
  88 #define TMDNUMMASK 0x40000000 /* log2(TMDNUM)<<29 */
  89 
  90 #define R_BUF_SIZE 1536
  91 #define T_BUF_SIZE 1536
  92 
  93 /*
  94  * lance register defines
  95  */
  96 #define L_DATAREG 0x00
  97 #define L_ADDRREG 0x02
  98 
  99 #define L_RESET   0x04
 100 #define L_CONFIG  0x05
 101 #define L_EBASE   0x08
 102 
 103 /* 
 104  * to access the am7990-regs, you have to write
 105  * reg-number into L_ADDRREG, then you can access it using L_DATAREG
 106  */
 107 #define CSR0 0x00
 108 #define CSR1 0x01
 109 #define CSR2 0x02
 110 #define CSR3 0x03
 111 
 112 #define writereg(val,reg) {outw(reg,PORT+L_ADDRREG);inw(PORT+L_ADDRREG); \
 113                            outw(val,PORT+L_DATAREG);inw(PORT+L_DATAREG);}
 114 #define readreg(reg) (outw(reg,PORT+L_ADDRREG),inw(PORT+L_ADDRREG),\
 115                        inw(PORT+L_DATAREG))
 116 #define writedatareg(val) {outw(val,PORT+L_DATAREG);inw(PORT+L_DATAREG);}
 117 
 118 static int  ni65_probe1(struct device **dev,int);
 119 static void ni65_interrupt(int irq, struct pt_regs *regs);
 120 static void ni65_recv_intr(struct device *dev,int);
 121 static void ni65_xmit_intr(struct device *dev,int);
 122 static int  ni65_open(struct device *dev);
 123 static int  ni65_am7990_reinit(struct device *dev);
 124 static int  ni65_send_packet(struct sk_buff *skb, struct device *dev);
 125 static int  ni65_close(struct device *dev);
 126 static struct enet_statistics *ni65_get_stats(struct device *);
 127 static void set_multicast_list(struct device *dev);
 128 
 129 struct priv 
 130 {
 131   struct rmd rmdhead[RMDNUM];
 132   struct tmd tmdhead[TMDNUM];
 133   struct init_block ib; 
 134   int rmdnum;
 135   int tmdnum,tmdlast;
 136 #ifdef RCV_VIA_SKB
 137   struct sk_buff *recv_skb[RMDNUM];
 138 #else
 139   void *recvbounce[RMDNUM];
 140 #endif
 141 #ifdef XMT_VIA_SKB
 142   struct sk_buff *tmd_skb[TMDNUM];
 143 #endif
 144   void *tmdbounce[TMDNUM];
 145   int lock,xmit_queued;
 146   struct enet_statistics stats;
 147 }; 
 148 
 149 static int irqtab[] = { 9,12,15,5 }; /* irq config-translate */
 150 static int dmatab[] = { 0,3,5,6 };   /* dma config-translate */
 151 static int debuglevel = 0;
 152 
 153 /*
 154  * open (most done by init) 
 155  */
 156 static int ni65_open(struct device *dev)
     /*  */
 157 {
 158   if(ni65_am7990_reinit(dev))
 159   {
 160     dev->tbusy     = 0;
 161     dev->interrupt = 0;
 162     dev->start     = 1;
 163     return 0;
 164   }
 165   else
 166   {
 167     dev->start = 0;
 168     return -EAGAIN;
 169   }
 170 }
 171 
 172 static int ni65_close(struct device *dev)
     /*  */
 173 {
 174   outw(0,PORT+L_RESET); /* that's the hard way */
 175   dev->tbusy = 1;
 176   dev->start = 0;
 177   return 0; 
 178 }
 179 
 180 /* 
 181  * Probe The Card (not the lance-chip) 
 182  * and set hardaddress
 183  */ 
 184 int ni65_probe(struct device *dev)
     /*  */
 185 {
 186   int *port;
 187   static int ports[] = {0x300,0x320,0x340,0x360, 0};
 188 
 189   if(dev) {
 190     int base_addr = dev->base_addr;
 191     if (base_addr > 0x1ff)          /* Check a single specified location. */
 192        return ni65_probe1(&dev, base_addr);
 193     else if (base_addr > 0)         /* Don't probe at all. */
 194        return -ENXIO;
 195     dev->base_addr = base_addr;
 196   }
 197 
 198   for (port = ports; *port; port++) 
 199   {
 200     int ioaddr = *port;
 201 
 202     if (check_region(ioaddr, NI65_TOTAL_SIZE))
 203        continue;
 204     if( !(inb(ioaddr+L_EBASE+6) == NI65_ID0) || 
 205         !(inb(ioaddr+L_EBASE+7) == NI65_ID1) )
 206        continue;
 207     if (ni65_probe1(&dev, ioaddr) == 0)
 208        return 0;
 209   }
 210 
 211   return -ENODEV;
 212 }
 213 
 214 int ni65_init(void)
     /*  */
 215 {
 216         ni65_probe(NULL);
 217         return 0;
 218 }
 219 
 220 static int ni65_probe1(struct device **dev1,int ioaddr)
     /*  */
 221 {
 222   int i;
 223   unsigned char *ptr;
 224   struct priv *p; 
 225   struct device *dev = *dev1;
 226 
 227   if(inb(ioaddr+L_EBASE+0) != NI65_ADDR0 || inb(ioaddr+L_EBASE+1) != NI65_ADDR1 
 228       || inb(ioaddr+L_EBASE+2) != NI65_ADDR2)
 229   {
 230     printk("%s: wrong Hardaddress \n",dev ? dev->name : "ni6510" );
 231     return -ENODEV;
 232   }
 233 
 234   if(!dev) {
 235     dev = init_etherdev(0,0);
 236     *dev1 = dev;
 237   }
 238   dev->base_addr = ioaddr;
 239 
 240   for(i=0;i<6;i++)
 241     dev->dev_addr[i] = inb(PORT+L_EBASE+i);
 242 
 243   if(dev->irq == 0) 
 244     dev->irq = irqtab[(inw(PORT+L_CONFIG)>>2)&3];
 245   if(dev->dma == 0)  
 246     dev->dma = dmatab[inw(PORT+L_CONFIG)&3];
 247 
 248   printk("%s: %s found at %#3lx, IRQ %d DMA %d.\n", dev->name,
 249            "ni6510", dev->base_addr, dev->irq,dev->dma);
 250 
 251   {        
 252     int irqval = request_irq(dev->irq, &ni65_interrupt,0,"ni6510");
 253     if (irqval) {
 254       printk ("%s: unable to get IRQ %d (irqval=%d).\n", 
 255                 dev->name,dev->irq, irqval);
 256       return -EAGAIN;
 257     }
 258     if(request_dma(dev->dma, "ni6510") != 0)
 259     {
 260       printk("%s: Can't request dma-channel %d\n",dev->name,(int) dev->dma);
 261       free_irq(dev->irq);
 262       return -EAGAIN;
 263     }
 264   }
 265   irq2dev_map[dev->irq] = dev;
 266 
 267   /* 
 268    * Grab the region so we can find another board if autoIRQ fails. 
 269    */
 270   request_region(ioaddr,NI65_TOTAL_SIZE,"ni6510");
 271 
 272   dev->open               = ni65_open;
 273   dev->stop               = ni65_close;
 274   dev->hard_start_xmit    = ni65_send_packet;
 275   dev->get_stats          = ni65_get_stats;
 276   dev->set_multicast_list = set_multicast_list;
 277 
 278   ether_setup(dev);
 279 
 280   dev->interrupt      = 0;
 281   dev->tbusy          = 0;
 282   dev->start          = 0;
 283 
 284   /* 
 285    * we need 8-aligned memory ..
 286    */
 287   ptr = kmalloc(sizeof(struct priv)+8,GFP_KERNEL|GFP_DMA);
 288   if(!ptr)
 289     return -ENOMEM;
 290   ptr = (unsigned char *) (((unsigned long) ptr + 7) & ~0x7);
 291   if( (unsigned long) ptr + sizeof(struct priv) > 0x1000000) {
 292     printk("%s: Can't alloc buffer in lower 16MB!\n",dev->name);
 293     return -EAGAIN;
 294   }
 295   p = dev->priv = (struct priv *) ptr;
 296   memset((char *) dev->priv,0,sizeof(struct priv));
 297 
 298   for(i=0;i<TMDNUM;i++)
 299   {
 300     if( (ptr = kmalloc(T_BUF_SIZE,GFP_KERNEL | GFP_DMA )) == NULL) {
 301       printk("%s: Can't alloc Xmit-Mem.\n",dev->name);
 302       return -ENOMEM;
 303     }
 304     if( (unsigned long) (ptr+T_BUF_SIZE) > 0x1000000) {
 305       printk("%s: Can't alloc Xmit-Mem in lower 16MB!\n",dev->name);
 306       return -EAGAIN;
 307     }
 308     p->tmdbounce[i] = ptr;
 309 #ifdef XMT_VIA_SKB
 310     p->tmd_skb[i] = NULL;
 311 #endif
 312   }
 313 
 314 #ifdef RCV_VIA_SKB
 315    for(i=0;i<RMDNUM;i++)
 316    {
 317      struct sk_buff *skb;
 318      if( !(skb = dev_alloc_skb(R_BUF_SIZE+2)) ) {
 319        printk("%s: unable to alloc recv-mem\n",dev->name);
 320        return -ENOMEM;
 321      }
 322      skb->dev = dev;
 323      skb_reserve(skb,2);
 324      skb_put(skb,R_BUF_SIZE);   /* grab the whole space .. (not necessary) */
 325      if( (unsigned long) (skb->data + R_BUF_SIZE) > 0x1000000 ) {
 326        printk("%s: unable to alloc receive-memory in lower 16MB!\n",dev->name);
 327        return -EAGAIN;
 328      }
 329      p->recv_skb[i] = skb;
 330    }
 331 #else
 332    for(i=0;i<RMDNUM;i++)
 333    {
 334      if( !(p->recvbounce[i] = kmalloc(R_BUF_SIZE,GFP_KERNEL | GFP_DMA )) ) {
 335        printk("%s: unable to alloc recv-mem\n",dev->name);
 336        return -ENOMEM;
 337      }
 338      if( (unsigned long) p->recvbounce[i] + R_BUF_SIZE > 0x1000000 ) {
 339        printk("%s: unable to alloc receive-memory in lower 16MB!\n",dev->name);
 340        return -EAGAIN;
 341      }
 342    }
 343 #endif
 344 
 345   return 0; /* we've found everything */
 346 }
 347 
 348 /* 
 349  * init lance (write init-values .. init-buffers) (open-helper)
 350  */
 351 
 352 static int ni65_am7990_reinit(struct device *dev)
     /*  */
 353 {
 354    int i;
 355    struct priv *p = (struct priv *) dev->priv;
 356 
 357    p->lock = 0;
 358    p->xmit_queued = 0;
 359 
 360    disable_dma(dev->dma); /* I've never worked with dma, but we do it like the packetdriver */
 361    set_dma_mode(dev->dma,DMA_MODE_CASCADE);
 362    enable_dma(dev->dma); 
 363 
 364    outw(0,PORT+L_RESET); /* first: reset the card */
 365    if(inw(PORT+L_DATAREG) != 0x4)
 366    {
 367      printk(KERN_ERR "%s: can't RESET ni6510 card: %04x\n",dev->name,(int) inw(PORT+L_DATAREG));
 368      disable_dma(dev->dma);
 369      free_dma(dev->dma);
 370      free_irq(dev->irq);
 371      return 0;
 372    }
 373 
 374    p->tmdnum = 0; p->tmdlast = 0;
 375    for(i=0;i<TMDNUM;i++)
 376    {
 377      struct tmd *tmdp = p->tmdhead + i;
 378 #ifdef XMT_VIA_SKB
 379      if(p->tmd_skb[i]) {
 380        dev_kfree_skb(p->tmd_skb[i],FREE_WRITE);
 381        p->tmd_skb[i] = NULL;
 382      }
 383 #endif
 384      tmdp->u.buffer = 0x0;
 385      tmdp->u.s.status = XMIT_START | XMIT_END;
 386      tmdp->blen = tmdp->status2 = 0;
 387    }
 388 
 389    p->rmdnum = 0;
 390    for(i=0;i<RMDNUM;i++)
 391    {
 392      struct rmd *rmdp = p->rmdhead + i;
 393 #ifdef RCV_VIA_SKB
 394      rmdp->u.buffer = (unsigned long) p->recv_skb[i]->data;
 395 #else
 396      rmdp->u.buffer = (unsigned long) p->recvbounce[i];
 397 #endif
 398      rmdp->blen = -(R_BUF_SIZE-8);
 399      rmdp->mlen = 0;
 400      rmdp->u.s.status = RCV_OWN;
 401    }
 402    
 403    for(i=0;i<6;i++)
 404      p->ib.eaddr[i] = dev->dev_addr[i];
 405 
 406    for(i=0;i<8;i++)
 407      p->ib.filter[i] = 0x0;
 408    p->ib.mode = 0x0;
 409 
 410    if(dev->flags & IFF_PROMISC) {
 411      p->ib.mode = M_PROM;
 412    }
 413    else if(dev->mc_count || dev->flags & IFF_ALLMULTI) {
 414      for(i=0;i<8;i++)
 415        p->ib.filter[i] = 0xff;
 416    }
 417 
 418    p->ib.trp = (unsigned long) p->tmdhead | TMDNUMMASK;
 419    p->ib.rrp = (unsigned long) p->rmdhead | RMDNUMMASK;
 420 
 421    writereg(0,CSR3);  /* busmaster/no word-swap */
 422    writereg((unsigned short) (((unsigned long) &(p->ib)) & 0xffff),CSR1);
 423    writereg((unsigned short) (((unsigned long) &(p->ib))>>16),CSR2);
 424 
 425    writereg(CSR0_INIT,CSR0); /* this changes L_ADDRREG to CSR0 */
 426 
 427   /*
 428    * NOW, WE WILL NEVER CHANGE THE L_ADDRREG, CSR0 IS ALWAYS SELECTED 
 429    */
 430 
 431     for(i=0;i<32;i++)
 432     {
 433       __delay((loops_per_sec>>8)); /* wait a while */
 434       if(inw(PORT+L_DATAREG) & CSR0_IDON) 
 435         break; /* init ok ? */
 436     }
 437     if(i == 32) 
 438     {
 439       printk(KERN_ERR "%s: can't init am7990/lance, status: %04x\n",dev->name,(int) inw(PORT+L_DATAREG));
 440       disable_dma(dev->dma);
 441       free_dma(dev->dma);
 442       free_irq(dev->irq);
 443       return 0; /* false */
 444     } 
 445 
 446     writedatareg(CSR0_CLRALL | CSR0_INEA | CSR0_STRT); /* start lance , enable interrupts */
 447 
 448     return 1; /* OK */
 449 }
 450  
 451 /* 
 452  * interrupt handler  
 453  */
 454 static void ni65_interrupt(int irq, struct pt_regs * regs)
     /*  */
 455 {
 456   int csr0;
 457   struct device *dev = (struct device *) irq2dev_map[irq];
 458   int bcnt = 32;
 459 
 460   if (dev == NULL) {
 461     printk (KERN_ERR "ni65_interrupt(): irq %d for unknown device.\n", irq);
 462     return;
 463   }
 464 
 465   dev->interrupt = 1;
 466 
 467   while(--bcnt) {
 468 
 469     csr0 = inw(PORT+L_DATAREG);
 470     writedatareg(csr0 & CSR0_CLRALL); /* ack interrupts, disable int. */
 471 
 472     if(!(csr0 & (CSR0_ERR | CSR0_RINT | CSR0_TINT)))
 473       break;
 474 
 475     if(csr0 & CSR0_ERR)
 476     {
 477       struct priv *p = (struct priv *) dev->priv;
 478 
 479       if(csr0 & CSR0_BABL)
 480         p->stats.tx_errors++;
 481       if(csr0 & CSR0_MISS)
 482         p->stats.rx_errors++;
 483       if(csr0 & CSR0_MERR) {
 484         writedatareg(CSR0_STOP);
 485         writedatareg(CSR0_STRT);
 486       }
 487     }
 488     if(csr0 & CSR0_RINT) /* RECV-int? */
 489       ni65_recv_intr(dev,csr0);
 490     if(csr0 & CSR0_TINT) /* XMIT-int? */
 491       ni65_xmit_intr(dev,csr0);
 492   }
 493 
 494 #ifdef RCV_PARANOIA_CHECK
 495 {
 496   struct priv *p = (struct priv *) dev->priv;
 497   int i,f=0;
 498   for(i=0;i<RMDNUM;i++) {
 499      struct rmd *rmdp = p->rmdhead + ((p->rmdnum - i - 1) & (RMDNUM-1));
 500      if(! (rmdp->u.s.status & RCV_OWN) )
 501         f = 1;
 502      else if(f)
 503         break;
 504   }
 505 
 506   if(i < RMDNUM) {
 507     p->rmdnum = (p->rmdnum + 8 - i) & (RMDNUM - 1);
 508     printk(KERN_ERR "%s: Ooops, receive ring currupted\n",dev->name);
 509 
 510     ni65_recv_intr(dev,csr0);
 511   }
 512 }
 513 #endif
 514 
 515   if(csr0 & (CSR0_RXON | CSR0_TXON) != (CSR0_RXON | CSR0_TXON) ) {
 516     writedatareg(CSR0_STOP);
 517     writedatareg(CSR0_STRT | CSR0_INEA);
 518   }
 519   else
 520     writedatareg(CSR0_INEA);
 521   dev->interrupt = 0;
 522 
 523   return;
 524 }
 525 
 526 /*
 527  * We have received an Xmit-Interrupt ..
 528  * send a new packet if necessary
 529  */
 530 static void ni65_xmit_intr(struct device *dev,int csr0)
     /*  */
 531 {
 532   struct priv *p = (struct priv *) dev->priv;
 533 
 534   while(p->xmit_queued)
 535   {
 536     struct tmd *tmdp = p->tmdhead + p->tmdlast;
 537     int tmdstat = tmdp->u.s.status;
 538 
 539     if(tmdstat & XMIT_OWN)
 540       break;
 541 
 542 #ifdef XMT_VIA_SKB
 543     if(p->tmd_skb[p->tmdlast]) {
 544        dev_kfree_skb(p->tmd_skb[p->tmdlast],FREE_WRITE);
 545        p->tmd_skb[p->tmdlast] = NULL;
 546     }
 547 #endif
 548 
 549     if(tmdstat & XMIT_ERR)
 550     {
 551 #if 0
 552       if(tmdp->status2 & XMIT_TDRMASK && debuglevel > 3)
 553         printk(KERN_ERR "%s: tdr-problems (e.g. no resistor)\n",dev->name);
 554 #endif
 555      /* checking some errors */
 556       if(tmdp->status2 & XMIT_RTRY)
 557         p->stats.tx_aborted_errors++;
 558       if(tmdp->status2 & XMIT_LCAR)
 559         p->stats.tx_carrier_errors++;
 560       if(tmdp->status2 & (XMIT_BUFF | XMIT_UFLO )) {
 561         p->stats.tx_fifo_errors++;
 562         writedatareg(CSR0_STOP);
 563         writedatareg(CSR0_STRT);
 564         if(debuglevel > 1)
 565           printk(KERN_ERR "%s: Xmit FIFO/BUFF error\n",dev->name);
 566       }
 567       if(debuglevel > 2)
 568         printk(KERN_ERR "%s: xmit-error: %04x %02x-%04x\n",dev->name,csr0,(int) tmdstat,(int) tmdp->status2);
 569       p->stats.tx_errors++;
 570       tmdp->status2 = 0;
 571     }
 572     else
 573       p->stats.tx_packets++;
 574 
 575     p->tmdlast = (p->tmdlast + 1) & (TMDNUM-1);
 576     if(p->tmdlast == p->tmdnum)
 577       p->xmit_queued = 0;
 578   }
 579   dev->tbusy = 0;
 580   mark_bh(NET_BH);
 581 }
 582 
 583 /*
 584  * We have received a packet
 585  */
 586 
 587 static void ni65_recv_intr(struct device *dev,int csr0)
     /*  */
 588 {
 589   struct rmd *rmdp; 
 590   int rmdstat,len;
 591   struct priv *p = (struct priv *) dev->priv;
 592 
 593   rmdp = p->rmdhead + p->rmdnum;
 594   while(!( (rmdstat = rmdp->u.s.status) & RCV_OWN))
 595   {
 596     if( (rmdstat & (RCV_START | RCV_END | RCV_ERR)) != (RCV_START | RCV_END) ) /* error or oversized? */ 
 597     {
 598       if(!(rmdstat & RCV_ERR)) {
 599         if(rmdstat & RCV_START)
 600         {
 601           p->stats.rx_length_errors++;
 602           printk(KERN_ERR "%s: recv, packet too long: %d\n",dev->name,rmdp->mlen & 0x0fff);
 603         }
 604       }
 605       else {
 606         printk(KERN_ERR "%s: receive-error: %04x, lance-status: %04x/%04x\n",
 607                 dev->name,(int) rmdstat,csr0,(int) inw(PORT+L_DATAREG) );
 608         if(rmdstat & RCV_FRAM)
 609           p->stats.rx_frame_errors++;
 610         if(rmdstat & RCV_OFLO)
 611           p->stats.rx_over_errors++;
 612         if(rmdstat & (RCV_OFLO | RCV_BUF_ERR) ) { 
 613           writedatareg(CSR0_STOP);
 614           writedatareg(CSR0_STRT);
 615           if(debuglevel > 1)
 616             printk(KERN_ERR "%s: Rcv FIFO/BUFF error.\n",dev->name);
 617         }
 618         if(rmdstat & RCV_CRC)  p->stats.rx_crc_errors++;
 619       }
 620       rmdp->u.s.status = RCV_OWN; /* change owner */
 621       p->stats.rx_errors++;
 622     }
 623     else if( (len = (rmdp->mlen & 0x0fff) - 4) >= 60)
 624     {
 625 #ifdef RCV_VIA_SKB
 626       struct sk_buff *skb = dev_alloc_skb(R_BUF_SIZE+2);
 627 #else
 628       struct sk_buff *skb = dev_alloc_skb(len+2);
 629 #endif
 630       if(skb)
 631       {
 632         skb_reserve(skb,2);
 633         skb->dev = dev;
 634 #ifdef RCV_VIA_SKB
 635         if( (unsigned long) (skb->data + R_BUF_SIZE) > 0x1000000) {
 636           skb_put(skb,len);
 637           eth_copy_and_sum(skb, (unsigned char *)(p->recv_skb[p->rmdnum]->data),len,0);
 638         }
 639         else {
 640           struct sk_buff *skb1 = p->recv_skb[p->rmdnum];
 641           skb_put(skb,R_BUF_SIZE);
 642           p->recv_skb[p->rmdnum] = skb;
 643           rmdp->u.buffer = (unsigned long) skb->data;
 644           skb = skb1;
 645           skb_trim(skb,len);
 646         }
 647 #else
 648         skb_put(skb,len);
 649         eth_copy_and_sum(skb, (unsigned char *) p->recvbounce[p->rmdnum],len,0);
 650 #endif
 651         rmdp->u.s.status = RCV_OWN;
 652         p->stats.rx_packets++;
 653         skb->protocol=eth_type_trans(skb,dev);
 654         netif_rx(skb);
 655       }
 656       else
 657       {
 658         rmdp->u.s.status = RCV_OWN;
 659         printk(KERN_ERR "%s: can't alloc new sk_buff\n",dev->name);
 660         p->stats.rx_dropped++;
 661       }
 662     }
 663     else {
 664       rmdp->u.s.status = RCV_OWN;
 665       printk(KERN_INFO "%s: received runt packet\n",dev->name);
 666       p->stats.rx_errors++;
 667     }
 668     p->rmdnum = (p->rmdnum + 1) & (RMDNUM-1);
 669     rmdp = p->rmdhead + p->rmdnum;
 670   }
 671 }
 672 
 673 /*
 674  * kick xmitter ..
 675  */
 676 static int ni65_send_packet(struct sk_buff *skb, struct device *dev)
     /*  */
 677 {
 678   struct priv *p = (struct priv *) dev->priv;
 679 
 680   if(dev->tbusy)
 681   {
 682     int tickssofar = jiffies - dev->trans_start;
 683     if (tickssofar < 5)
 684       return 1;
 685 
 686     printk(KERN_ERR "%s: xmitter timed out, try to restart!\n",dev->name);
 687     ni65_am7990_reinit(dev);
 688     dev->tbusy=0;
 689     dev->trans_start = jiffies;
 690   }
 691 
 692   if(skb == NULL) {
 693     dev_tint(dev);
 694     return 0;
 695   }
 696 
 697   if (skb->len <= 0)
 698     return 0;
 699 
 700   if (set_bit(0, (void*)&dev->tbusy) != 0) {
 701      printk(KERN_ERR "%s: Transmitter access conflict.\n", dev->name);
 702      return 1;
 703   }
 704   if (set_bit(0, (void*)&p->lock)) {
 705         printk(KERN_ERR "%s: Queue was locked.\n", dev->name);
 706         return 1;
 707   }
 708 
 709   {
 710     short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
 711     struct tmd *tmdp = p->tmdhead + p->tmdnum;
 712     long flags;
 713 
 714 #ifdef XMT_VIA_SKB
 715     if( (unsigned long) (skb->data + skb->len) > 0x1000000) {
 716 #endif
 717       tmdp->u.buffer = (unsigned long ) p->tmdbounce[p->tmdnum]; 
 718       memcpy((char *) tmdp->u.buffer,(char *)skb->data,
 719                (skb->len > T_BUF_SIZE) ? T_BUF_SIZE : skb->len);
 720       dev_kfree_skb (skb, FREE_WRITE);
 721 #ifdef XMT_VIA_SKB
 722     }
 723     else {
 724       tmdp->u.buffer = (unsigned long) skb->data;
 725       p->tmd_skb[p->tmdnum] = skb;
 726     }
 727 #endif
 728     tmdp->blen = -len;
 729 
 730     save_flags(flags);
 731     cli();
 732 
 733     tmdp->u.s.status = XMIT_OWN | XMIT_START | XMIT_END;
 734     writedatareg(CSR0_TDMD | CSR0_INEA); /* enable xmit & interrupt */
 735 
 736     p->xmit_queued = 1;
 737     p->tmdnum = (p->tmdnum + 1) & (TMDNUM-1);
 738 
 739     dev->tbusy = (p->tmdnum == p->tmdlast) ? 1 : 0;
 740     p->lock = 0;
 741     dev->trans_start = jiffies;
 742 
 743     restore_flags(flags);
 744   }
 745 
 746   return 0;
 747 }
 748 
 749 static struct enet_statistics *ni65_get_stats(struct device *dev)
     /*  */
 750 {
 751   return &((struct priv *) dev->priv)->stats;
 752 }
 753 
 754 static void set_multicast_list(struct device *dev)
     /*  */
 755 {
 756         if(!ni65_am7990_reinit(dev))
 757                 printk(KERN_ERR "%s: Can't switch card into MC mode!\n",dev->name);
 758         dev->tbusy = 0;
 759 }
 760 
 761 /*
 762  * END of ni65.c 
 763  */
 764
/* */
root/drivers/net/ni65.c

DEFINITIONS
