i386/linux/linux-2.3.21/drivers/net/7990.c

   1 /*
   2  * 7990.c -- LANCE ethernet IC generic routines.
   3  * This is an attempt to separate out the bits of various ethernet
   4  * drivers that are common because they all use the AMD 7990 LANCE
   5  * (Local Area Network Controller for Ethernet) chip.
   6  *
   7  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
   8  *
   9  * Most of this stuff was obtained by looking at other LANCE drivers,
  10  * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
  11  * NB: this was made easy by the fact that Jes Sorensen had cleaned up
  12  * most of a2025 and sunlance with the aim of merging them, so the
  13  * common code was pretty obvious.
  14  */
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/sched.h>
  18 #include <linux/types.h>
  19 #include <linux/fcntl.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/ioport.h>
  23 #include <linux/in.h>
  24 #include <linux/malloc.h>
  25 #include <linux/string.h>
  26 #include <linux/delay.h>
  27 #include <linux/init.h>
  28 #include <asm/system.h>
  29 #include <asm/bitops.h>
  30 #include <asm/io.h>
  31 #include <asm/dma.h>
  32 #include <asm/pgtable.h>
  33 #include <linux/errno.h>
  34
  35 /* Used for the temporal inet entries and routing */
  36 #include <linux/socket.h>
  37 #include <linux/route.h>
  38
  39 #include <linux/dio.h>
  40
  41 #include <linux/netdevice.h>
  42 #include <linux/etherdevice.h>
  43 #include <linux/skbuff.h>
  44
  45 #include "7990.h"
  46
  47 /* Lossage Factor Nine, Mr Sulu. */
  48 #define WRITERAP(x) (lp->writerap(lp,x))
  49 #define WRITERDP(x) (lp->writerdp(lp,x))
  50 #define READRDP() (lp->readrdp(lp))
  51 /* These used to be ll->rap = x, ll->rdp = x, and (ll->rdp). Sigh.
  52  * If you want to switch them back then
  53  * #define DECLARE_LL volatile struct lance_regs *ll = lp->ll
  54  */
  55 #define DECLARE_LL /* nothing to declare */
  56
  57 /* debugging output macros, various flavours */
  58 /* #define TEST_HITS */
  59 #ifdef UNDEF
  60 #define PRINT_RINGS() \
  61 do { \
  62         int t; \
  63         for (t=0; t < RX_RING_SIZE; t++) { \
  64                 printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n",\
  65                        t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,\
  66                        ib->brx_ring[t].length,\
  67                        ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);\
  68         }\
  69         for (t=0; t < TX_RING_SIZE; t++) { \
  70                 printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n",\
  71                        t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,\
  72                        ib->btx_ring[t].length,\
  73                        ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);\
  74         }\
  75 } while (0)
  76 #else
  77 #define PRINT_RINGS()
  78 #endif
  79
  80 /* Load the CSR registers. The LANCE has to be STOPped when we do this! */
  81 static void load_csrs (struct lance_private *lp)
  82 {
  83         volatile struct lance_init_block *aib = lp->lance_init_block;
  84         int leptr;
  85         DECLARE_LL;
  86
  87         leptr = LANCE_ADDR (aib);
  88
  89         WRITERAP(LE_CSR1);                        /* load address of init block */
  90         WRITERDP(leptr & 0xFFFF);
  91         WRITERAP(LE_CSR2);
  92         WRITERDP(leptr >> 16);
  93         WRITERAP(LE_CSR3);
  94         WRITERDP(lp->busmaster_regval);           /* set byteswap/ALEctrl/byte ctrl */
  95
  96         /* Point back to csr0 */
  97         WRITERAP(LE_CSR0);
  98 }
  99
 100 /* #define to 0 or 1 appropriately */
 101 #define DEBUG_IRING 0
 102 /* Set up the Lance Rx and Tx rings and the init block */
 103 /* Sets dev->tbusy */
 104 static void lance_init_ring (struct net_device *dev)
 105 {
 106         struct lance_private *lp = (struct lance_private *) dev->priv;
 107         volatile struct lance_init_block *ib = lp->init_block;
 108         volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
 109         int leptr;
 110         int i;
 111
 112         aib = lp->lance_init_block;
 113
 114         /* Lock out other processes while setting up hardware */
 115         dev->tbusy = 1;
 116         lp->rx_new = lp->tx_new = 0;
 117         lp->rx_old = lp->tx_old = 0;
 118
 119         ib->mode = LE_MO_PROM;                             /* normal, enable Tx & Rx */
 120
 121         /* Copy the ethernet address to the lance init block
 122          * Notice that we do a byteswap if we're big endian.
 123          * [I think this is the right criterion; at least, sunlance,
 124          * a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
 125          * However, the datasheet says that the BSWAP bit doesn't affect
 126          * the init block, so surely it should be low byte first for
 127          * everybody? Um.]
 128          * We could define the ib->physaddr as three 16bit values and
 129          * use (addr[1] << 8) | addr[0] & co, but this is more efficient.
 130          */
 131 #ifdef __BIG_ENDIAN
 132         ib->phys_addr [0] = dev->dev_addr [1];
 133         ib->phys_addr [1] = dev->dev_addr [0];
 134         ib->phys_addr [2] = dev->dev_addr [3];
 135         ib->phys_addr [3] = dev->dev_addr [2];
 136         ib->phys_addr [4] = dev->dev_addr [5];
 137         ib->phys_addr [5] = dev->dev_addr [4];
 138 #else
 139         for (i=0; i<6; i++)
 140            ib->phys_addr[i] = dev->dev_addr[i];
 141 #endif
 142
 143         if (DEBUG_IRING)
 144                 printk ("TX rings:\n");
 145
 146         /* Setup the Tx ring entries */
 147         for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {
 148                 leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
 149                 ib->btx_ring [i].tmd0      = leptr;
 150                 ib->btx_ring [i].tmd1_hadr = leptr >> 16;
 151                 ib->btx_ring [i].tmd1_bits = 0;
 152                 ib->btx_ring [i].length    = 0xf000; /* The ones required by tmd2 */
 153                 ib->btx_ring [i].misc      = 0;
 154                 if (DEBUG_IRING)
 155                    printk ("%d: 0x%8.8x\n", i, leptr);
 156         }
 157
 158         /* Setup the Rx ring entries */
 159         if (DEBUG_IRING)
 160                 printk ("RX rings:\n");
 161         for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {
 162                 leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
 163
 164                 ib->brx_ring [i].rmd0      = leptr;
 165                 ib->brx_ring [i].rmd1_hadr = leptr >> 16;
 166                 ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
 167                 /* 0xf000 == bits that must be one (reserved, presumably) */
 168                 ib->brx_ring [i].length    = -RX_BUFF_SIZE | 0xf000;
 169                 ib->brx_ring [i].mblength  = 0;
 170                 if (DEBUG_IRING)
 171                         printk ("%d: 0x%8.8x\n", i, leptr);
 172         }
 173
 174         /* Setup the initialization block */
 175
 176         /* Setup rx descriptor pointer */
 177         leptr = LANCE_ADDR(&aib->brx_ring);
 178         ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
 179         ib->rx_ptr = leptr;
 180         if (DEBUG_IRING)
 181                 printk ("RX ptr: %8.8x\n", leptr);
 182
 183         /* Setup tx descriptor pointer */
 184         leptr = LANCE_ADDR(&aib->btx_ring);
 185         ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
 186         ib->tx_ptr = leptr;
 187         if (DEBUG_IRING)
 188                 printk ("TX ptr: %8.8x\n", leptr);
 189
 190         /* Clear the multicast filter */
 191         ib->filter [0] = 0;
 192         ib->filter [1] = 0;
 193         PRINT_RINGS();
 194 }
 195
 196 /* LANCE must be STOPped before we do this, too... */
 197 static int init_restart_lance (struct lance_private *lp)
 198 {
 199         int i;
 200         DECLARE_LL;
 201
 202         WRITERAP(LE_CSR0);
 203         WRITERDP(LE_C0_INIT);
 204
 205         /* Need a hook here for sunlance ledma stuff */
 206
 207         /* Wait for the lance to complete initialization */
 208         for (i = 0; (i < 100) && !(READRDP() & (LE_C0_ERR | LE_C0_IDON)); i++)
 209                 barrier();
 210         if ((i == 100) || (READRDP() & LE_C0_ERR)) {
 211                 printk ("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP());
 212                 return -1;
 213         }
 214
 215         /* Clear IDON by writing a "1", enable interrupts and start lance */
 216         WRITERDP(LE_C0_IDON);
 217         WRITERDP(LE_C0_INEA | LE_C0_STRT);
 218
 219         return 0;
 220 }
 221
 222 static int lance_reset (struct net_device *dev)
 223 {
 224         struct lance_private *lp = (struct lance_private *)dev->priv;
 225         int status;
 226         DECLARE_LL;
 227
 228         /* Stop the lance */
 229         WRITERAP(LE_CSR0);
 230         WRITERDP(LE_C0_STOP);
 231
 232         load_csrs (lp);
 233         lance_init_ring (dev);
 234         dev->trans_start = jiffies;
 235         dev->interrupt = 0;
 236         dev->start = 1;
 237         dev->tbusy = 0;
 238         status = init_restart_lance (lp);
 239 #ifdef DEBUG_DRIVER
 240         printk ("Lance restart=%d\n", status);
 241 #endif
 242         return status;
 243 }
 244
 245 static int lance_rx (struct net_device *dev)
 246 {
 247         struct lance_private *lp = (struct lance_private *) dev->priv;
 248         volatile struct lance_init_block *ib = lp->init_block;
 249         volatile struct lance_rx_desc *rd;
 250         unsigned char bits;
 251         int len = 0;                    /* XXX shut up gcc warnings */
 252         struct sk_buff *skb = 0;        /* XXX shut up gcc warnings */
 253 #ifdef TEST_HITS
 254         int i;
 255 #endif
 256         DECLARE_LL;
 257
 258 #ifdef TEST_HITS
 259         printk ("[");
 260         for (i = 0; i < RX_RING_SIZE; i++) {
 261                 if (i == lp->rx_new)
 262                         printk ("%s",
 263                                 ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "_" : "X");
 264                 else
 265                         printk ("%s",
 266                                 ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "." : "1");
 267         }
 268         printk ("]");
 269 #endif
 270
 271         WRITERDP(LE_C0_RINT | LE_C0_INEA);     /* ack Rx int, reenable ints */
 272         for (rd = &ib->brx_ring [lp->rx_new];     /* For each Rx ring we own... */
 273              !((bits = rd->rmd1_bits) & LE_R1_OWN);
 274              rd = &ib->brx_ring [lp->rx_new]) {
 275
 276                 /* We got an incomplete frame? */
 277                 if ((bits & LE_R1_POK) != LE_R1_POK) {
 278                         lp->stats.rx_over_errors++;
 279                         lp->stats.rx_errors++;
 280                         continue;
 281                 } else if (bits & LE_R1_ERR) {
 282                         /* Count only the end frame as a rx error,
 283                          * not the beginning
 284                          */
 285                         if (bits & LE_R1_BUF) lp->stats.rx_fifo_errors++;
 286                         if (bits & LE_R1_CRC) lp->stats.rx_crc_errors++;
 287                         if (bits & LE_R1_OFL) lp->stats.rx_over_errors++;
 288                         if (bits & LE_R1_FRA) lp->stats.rx_frame_errors++;
 289                         if (bits & LE_R1_EOP) lp->stats.rx_errors++;
 290                 } else {
 291                         len = (rd->mblength & 0xfff) - 4;
 292                         skb = dev_alloc_skb (len+2);
 293
 294                         if (skb == 0) {
 295                                 printk ("%s: Memory squeeze, deferring packet.\n",
 296                                         dev->name);
 297                                 lp->stats.rx_dropped++;
 298                                 rd->mblength = 0;
 299                                 rd->rmd1_bits = LE_R1_OWN;
 300                                 lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
 301                                 return 0;
 302                         }
 303
 304                         skb->dev = dev;
 305                         skb_reserve (skb, 2);           /* 16 byte align */
 306                         skb_put (skb, len);             /* make room */
 307                         eth_copy_and_sum(skb,
 308                                          (unsigned char *)&(ib->rx_buf [lp->rx_new][0]),
 309                                          len, 0);
 310                         skb->protocol = eth_type_trans (skb, dev);
 311                         netif_rx (skb);
 312                         lp->stats.rx_packets++;
 313                 }
 314
 315                 /* Return the packet to the pool */
 316                 rd->mblength = 0;
 317                 rd->rmd1_bits = LE_R1_OWN;
 318                 lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
 319         }
 320         return 0;
 321 }
 322
 323 static int lance_tx (struct net_device *dev)
 324 {
 325         struct lance_private *lp = (struct lance_private *) dev->priv;
 326         volatile struct lance_init_block *ib = lp->init_block;
 327         volatile struct lance_tx_desc *td;
 328         int i, j;
 329         int status;
 330         DECLARE_LL;
 331
 332         /* csr0 is 2f3 */
 333         WRITERDP(LE_C0_TINT | LE_C0_INEA);
 334         /* csr0 is 73 */
 335
 336         j = lp->tx_old;
 337         for (i = j; i != lp->tx_new; i = j) {
 338                 td = &ib->btx_ring [i];
 339
 340                 /* If we hit a packet not owned by us, stop */
 341                 if (td->tmd1_bits & LE_T1_OWN)
 342                         break;
 343
 344                 if (td->tmd1_bits & LE_T1_ERR) {
 345                         status = td->misc;
 346
 347                         lp->stats.tx_errors++;
 348                         if (status & LE_T3_RTY)  lp->stats.tx_aborted_errors++;
 349                         if (status & LE_T3_LCOL) lp->stats.tx_window_errors++;
 350
 351                         if (status & LE_T3_CLOS) {
 352                                 lp->stats.tx_carrier_errors++;
 353                                 if (lp->auto_select) {
 354                                         lp->tpe = 1 - lp->tpe;
 355                                         printk("%s: Carrier Lost, trying %s\n",
 356                                                dev->name, lp->tpe?"TPE":"AUI");
 357                                         /* Stop the lance */
 358                                         WRITERAP(LE_CSR0);
 359                                         WRITERDP(LE_C0_STOP);
 360                                         lance_init_ring (dev);
 361                                         load_csrs (lp);
 362                                         init_restart_lance (lp);
 363                                         return 0;
 364                                 }
 365                         }
 366
 367                         /* buffer errors and underflows turn off the transmitter */
 368                         /* Restart the adapter */
 369                         if (status & (LE_T3_BUF|LE_T3_UFL)) {
 370                                 lp->stats.tx_fifo_errors++;
 371
 372                                 printk ("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
 373                                         dev->name);
 374                                 /* Stop the lance */
 375                                 WRITERAP(LE_CSR0);
 376                                 WRITERDP(LE_C0_STOP);
 377                                 lance_init_ring (dev);
 378                                 load_csrs (lp);
 379                                 init_restart_lance (lp);
 380                                 return 0;
 381                         }
 382                 } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
 383                         /*
 384                          * So we don't count the packet more than once.
 385                          */
 386                         td->tmd1_bits &= ~(LE_T1_POK);
 387
 388                         /* One collision before packet was sent. */
 389                         if (td->tmd1_bits & LE_T1_EONE)
 390                                 lp->stats.collisions++;
 391
 392                         /* More than one collision, be optimistic. */
 393                         if (td->tmd1_bits & LE_T1_EMORE)
 394                                 lp->stats.collisions += 2;
 395
 396                         lp->stats.tx_packets++;
 397                 }
 398
 399                 j = (j + 1) & lp->tx_ring_mod_mask;
 400         }
 401         lp->tx_old = j;
 402         WRITERDP(LE_C0_TINT | LE_C0_INEA);
 403         return 0;
 404 }
 405
 406 static void lance_interrupt (int irq, void *dev_id, struct pt_regs *regs)
 407 {
 408         struct net_device *dev = (struct net_device *)dev_id;
 409         struct lance_private *lp = (struct lance_private *)dev->priv;
 410         int csr0;
 411         DECLARE_LL;
 412
 413         WRITERAP(LE_CSR0);              /* LANCE Controller Status */
 414         csr0 = READRDP();
 415
 416         PRINT_RINGS();
 417
 418         if (!(csr0 & LE_C0_INTR))       /* Check if any interrupt has */
 419                 return;                 /* been generated by the Lance. */
 420
 421         if (dev->interrupt)
 422                 printk ("%s: again", dev->name);
 423
 424         dev->interrupt = 1;
 425
 426         /* Acknowledge all the interrupt sources ASAP */
 427         WRITERDP(csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
 428
 429         if ((csr0 & LE_C0_ERR)) {
 430                 /* Clear the error condition */
 431                 WRITERDP(LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
 432         }
 433
 434         if (csr0 & LE_C0_RINT)
 435                 lance_rx (dev);
 436
 437         if (csr0 & LE_C0_TINT)
 438                 lance_tx (dev);
 439
 440         /* Log misc errors. */
 441         if (csr0 & LE_C0_BABL)
 442                 lp->stats.tx_errors++;       /* Tx babble. */
 443         if (csr0 & LE_C0_MISS)
 444                 lp->stats.rx_errors++;       /* Missed a Rx frame. */
 445         if (csr0 & LE_C0_MERR) {
 446                 printk("%s: Bus master arbitration failure, status %4.4x.\n",
 447                        dev->name, csr0);
 448                 /* Restart the chip. */
 449                 WRITERDP(LE_C0_STRT);
 450         }
 451
 452         if ((TX_BUFFS_AVAIL >= 0) && dev->tbusy) {
 453                 dev->tbusy = 0;
 454                 mark_bh (NET_BH);
 455         }
 456
 457         WRITERAP(LE_CSR0);
 458         WRITERDP(LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
 459
 460         dev->interrupt = 0;
 461 }
 462
 463 int lance_open (struct net_device *dev)
 464 {
 465         struct lance_private *lp = (struct lance_private *)dev->priv;
 466         DECLARE_LL;
 467
 468         /* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
 469         if (request_irq(lp->irq, lance_interrupt, 0, lp->name, dev))
 470                 return -EAGAIN;
 471
 472         return lance_reset(dev);
 473 }
 474
 475 int lance_close (struct net_device *dev)
 476 {
 477         struct lance_private *lp = (struct lance_private *) dev->priv;
 478         DECLARE_LL;
 479
 480         dev->start = 0;
 481         dev->tbusy = 1;
 482
 483         /* Stop the LANCE */
 484         WRITERAP(LE_CSR0);
 485         WRITERDP(LE_C0_STOP);
 486
 487         free_irq(lp->irq, dev);
 488
 489         return 0;
 490 }
 491
 492 int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
 493 {
 494         struct lance_private *lp = (struct lance_private *)dev->priv;
 495         volatile struct lance_init_block *ib = lp->init_block;
 496         int entry, skblen, len;
 497         int status = 0;
 498         static int outs;
 499         DECLARE_LL;
 500
 501         lance_reset(dev);
 502
 503         /* Transmitter timeout, serious problems */
 504         if (dev->tbusy) {
 505                 int tickssofar = jiffies - dev->trans_start;
 506
 507                 if (tickssofar < 100) {
 508                         status = -1;
 509                 } else {
 510                         printk ("%s: transmit timed out, status %04x, resetting\n",
 511                                 dev->name, READRDP());
 512                         lance_reset (dev);
 513                 }
 514                 return status;
 515         }
 516
 517         /* Block a timer-based transmit from overlapping. */
 518         if (test_and_set_bit (0, (void *) &dev->tbusy) != 0) {
 519                 printk ("Transmitter access conflict.\n");
 520                 return -1;
 521         }
 522
 523         skblen = skb->len;
 524
 525         if (!TX_BUFFS_AVAIL)
 526                 return -1;
 527
 528 #ifdef DEBUG_DRIVER
 529         /* dump the packet */
 530         {
 531                 int i;
 532
 533                 for (i = 0; i < 64; i++) {
 534                         if ((i % 16) == 0)
 535                                 printk ("\n");
 536                         printk ("%2.2x ", skb->data [i]);
 537                 }
 538         }
 539 #endif
 540         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 541         entry = lp->tx_new & lp->tx_ring_mod_mask;
 542         ib->btx_ring [entry].length = (-len) | 0xf000;
 543         ib->btx_ring [entry].misc = 0;
 544
 545         memcpy ((char *)&ib->tx_buf [entry][0], skb->data, skblen);
 546
 547         /* Now, give the packet to the lance */
 548         ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
 549         lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
 550
 551         outs++;
 552         /* Kick the lance: transmit now */
 553         WRITERDP(LE_C0_INEA | LE_C0_TDMD);
 554         dev->trans_start = jiffies;
 555         dev_kfree_skb (skb);
 556
 557         if (TX_BUFFS_AVAIL)
 558                 dev->tbusy = 0;
 559
 560         return status;
 561 }
 562
 563 struct net_device_stats *lance_get_stats (struct net_device *dev)
 564 {
 565         struct lance_private *lp = (struct lance_private *) dev->priv;
 566
 567         return &lp->stats;
 568 }
 569
 570 /* taken from the depca driver via a2065.c */
 571 static void lance_load_multicast (struct net_device *dev)
 572 {
 573         struct lance_private *lp = (struct lance_private *) dev->priv;
 574         volatile struct lance_init_block *ib = lp->init_block;
 575         volatile u16 *mcast_table = (u16 *)&ib->filter;
 576         struct dev_mc_list *dmi=dev->mc_list;
 577         char *addrs;
 578         int i, j, bit, byte;
 579         u32 crc, poly = CRC_POLYNOMIAL_LE;
 580
 581         /* set all multicast bits */
 582         if (dev->flags & IFF_ALLMULTI){
 583                 ib->filter [0] = 0xffffffff;
 584                 ib->filter [1] = 0xffffffff;
 585                 return;
 586         }
 587         /* clear the multicast filter */
 588         ib->filter [0] = 0;
 589         ib->filter [1] = 0;
 590
 591         /* Add addresses */
 592         for (i = 0; i < dev->mc_count; i++){
 593                 addrs = dmi->dmi_addr;
 594                 dmi   = dmi->next;
 595
 596                 /* multicast address? */
 597                 if (!(*addrs & 1))
 598                         continue;
 599
 600                 crc = 0xffffffff;
 601                 for (byte = 0; byte < 6; byte++)
 602                         for (bit = *addrs++, j = 0; j < 8; j++, bit>>=1)
 603                         {
 604                                 int test;
 605
 606                                 test = ((bit ^ crc) & 0x01);
 607                                 crc >>= 1;
 608
 609                                 if (test)
 610                                 {
 611                                         crc = crc ^ poly;
 612                                 }
 613                         }
 614
 615                 crc = crc >> 26;
 616                 mcast_table [crc >> 4] |= 1 << (crc & 0xf);
 617         }
 618         return;
 619 }
 620
 621
 622 void lance_set_multicast (struct net_device *dev)
 623 {
 624         struct lance_private *lp = (struct lance_private *) dev->priv;
 625         volatile struct lance_init_block *ib = lp->init_block;
 626         DECLARE_LL;
 627
 628         while (dev->tbusy)
 629                 schedule();
 630         set_bit (0, (void *) &dev->tbusy);
 631
 632         while (lp->tx_old != lp->tx_new)
 633                 schedule();
 634
 635         WRITERAP(LE_CSR0);
 636         WRITERDP(LE_C0_STOP);
 637         lance_init_ring (dev);
 638
 639         if (dev->flags & IFF_PROMISC) {
 640                 ib->mode |= LE_MO_PROM;
 641         } else {
 642                 ib->mode &= ~LE_MO_PROM;
 643                 lance_load_multicast (dev);
 644         }
 645         load_csrs (lp);
 646         init_restart_lance (lp);
 647         dev->tbusy = 0;
 648 }
 649