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   1 /*
   2  * sonic.c
   3  *
   4  * (C) 2005 Finn Thain
   5  *
   6  * Converted to DMA API, added zero-copy buffer handling, and
   7  * (from the mac68k project) introduced dhd's support for 16-bit cards.
   8  *
   9  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  10  *
  11  * This driver is based on work from Andreas Busse, but most of
  12  * the code is rewritten.
  13  *
  14  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
  15  *
  16  *    Core code included by system sonic drivers
  17  *
  18  * And... partially rewritten again by David Huggins-Daines in order
  19  * to cope with screwed up Macintosh NICs that may or may not use
  20  * 16-bit DMA.
  21  *
  22  * (C) 1999 David Huggins-Daines <dhd@debian.org>
  23  *
  24  */
  25
  26 /*
  27  * Sources: Olivetti M700-10 Risc Personal Computer hardware handbook,
  28  * National Semiconductors data sheet for the DP83932B Sonic Ethernet
  29  * controller, and the files "8390.c" and "skeleton.c" in this directory.
  30  *
  31  * Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi
  32  * Application Note AN-746, the files "lance.c" and "ibmlana.c". See also
  33  * the NetBSD file "sys/arch/mac68k/dev/if_sn.c".
  34  */
  35
  36
  37
  38 /*
  39  * Open/initialize the SONIC controller.
  40  *
  41  * This routine should set everything up anew at each open, even
  42  *  registers that "should" only need to be set once at boot, so that
  43  *  there is non-reboot way to recover if something goes wrong.
  44  */
  45 static int sonic_open(struct net_device *dev)
  46 {
  47         struct sonic_local *lp = netdev_priv(dev);
  48         int i;
  49
  50         if (sonic_debug > 2)
  51                 printk("sonic_open: initializing sonic driver.\n");
  52
  53         /*
  54          * We don't need to deal with auto-irq stuff since we
  55          * hardwire the sonic interrupt.
  56          */
  57 /*
  58  * XXX Horrible work around:  We install sonic_interrupt as fast interrupt.
  59  * This means that during execution of the handler interrupt are disabled
  60  * covering another bug otherwise corrupting data.  This doesn't mean
  61  * this glue works ok under all situations.
  62  *
  63  * Note (dhd): this also appears to prevent lockups on the Macintrash
  64  * when more than one Ethernet card is installed (knock on wood)
  65  *
  66  * Note (fthain): whether the above is still true is anyones guess. Certainly
  67  * the buffer handling algorithms will not tolerate re-entrance without some
  68  * mutual exclusion added. Anyway, the memcpy has now been eliminated from the
  69  * rx code to make this a faster "fast interrupt".
  70  */
  71         if (request_irq(dev->irq, &sonic_interrupt, SONIC_IRQ_FLAG, "sonic", dev)) {
  72                 printk(KERN_ERR "\n%s: unable to get IRQ %d .\n", dev->name, dev->irq);
  73                 return -EAGAIN;
  74         }
  75
  76         for (i = 0; i < SONIC_NUM_RRS; i++) {
  77                 struct sk_buff *skb = dev_alloc_skb(SONIC_RBSIZE + 2);
  78                 if (skb == NULL) {
  79                         while(i > 0) { /* free any that were allocated successfully */
  80                                 i--;
  81                                 dev_kfree_skb(lp->rx_skb[i]);
  82                                 lp->rx_skb[i] = NULL;
  83                         }
  84                         printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
  85                                dev->name);
  86                         return -ENOMEM;
  87                 }
  88                 /* align IP header unless DMA requires otherwise */
  89                 if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
  90                         skb_reserve(skb, 2);
  91                 lp->rx_skb[i] = skb;
  92         }
  93
  94         for (i = 0; i < SONIC_NUM_RRS; i++) {
  95                 dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
  96                                                   SONIC_RBSIZE, DMA_FROM_DEVICE);
  97                 if (!laddr) {
  98                         while(i > 0) { /* free any that were mapped successfully */
  99                                 i--;
 100                                 dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
 101                                 lp->rx_laddr[i] = (dma_addr_t)0;
 102                         }
 103                         for (i = 0; i < SONIC_NUM_RRS; i++) {
 104                                 dev_kfree_skb(lp->rx_skb[i]);
 105                                 lp->rx_skb[i] = NULL;
 106                         }
 107                         printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
 108                                dev->name);
 109                         return -ENOMEM;
 110                 }
 111                 lp->rx_laddr[i] = laddr;
 112         }
 113
 114         /*
 115          * Initialize the SONIC
 116          */
 117         sonic_init(dev);
 118
 119         netif_start_queue(dev);
 120
 121         if (sonic_debug > 2)
 122                 printk("sonic_open: Initialization done.\n");
 123
 124         return 0;
 125 }
 126
 127
 128 /*
 129  * Close the SONIC device
 130  */
 131 static int sonic_close(struct net_device *dev)
 132 {
 133         struct sonic_local *lp = netdev_priv(dev);
 134         int i;
 135
 136         if (sonic_debug > 2)
 137                 printk("sonic_close\n");
 138
 139         netif_stop_queue(dev);
 140
 141         /*
 142          * stop the SONIC, disable interrupts
 143          */
 144         SONIC_WRITE(SONIC_IMR, 0);
 145         SONIC_WRITE(SONIC_ISR, 0x7fff);
 146         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 147
 148         /* unmap and free skbs that haven't been transmitted */
 149         for (i = 0; i < SONIC_NUM_TDS; i++) {
 150                 if(lp->tx_laddr[i]) {
 151                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 152                         lp->tx_laddr[i] = (dma_addr_t)0;
 153                 }
 154                 if(lp->tx_skb[i]) {
 155                         dev_kfree_skb(lp->tx_skb[i]);
 156                         lp->tx_skb[i] = NULL;
 157                 }
 158         }
 159
 160         /* unmap and free the receive buffers */
 161         for (i = 0; i < SONIC_NUM_RRS; i++) {
 162                 if(lp->rx_laddr[i]) {
 163                         dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
 164                         lp->rx_laddr[i] = (dma_addr_t)0;
 165                 }
 166                 if(lp->rx_skb[i]) {
 167                         dev_kfree_skb(lp->rx_skb[i]);
 168                         lp->rx_skb[i] = NULL;
 169                 }
 170         }
 171
 172         free_irq(dev->irq, dev);        /* release the IRQ */
 173
 174         return 0;
 175 }
 176
 177 static void sonic_tx_timeout(struct net_device *dev)
 178 {
 179         struct sonic_local *lp = netdev_priv(dev);
 180         int i;
 181         /*
 182          * put the Sonic into software-reset mode and
 183          * disable all interrupts before releasing DMA buffers
 184          */
 185         SONIC_WRITE(SONIC_IMR, 0);
 186         SONIC_WRITE(SONIC_ISR, 0x7fff);
 187         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 188         /* We could resend the original skbs. Easier to re-initialise. */
 189         for (i = 0; i < SONIC_NUM_TDS; i++) {
 190                 if(lp->tx_laddr[i]) {
 191                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 192                         lp->tx_laddr[i] = (dma_addr_t)0;
 193                 }
 194                 if(lp->tx_skb[i]) {
 195                         dev_kfree_skb(lp->tx_skb[i]);
 196                         lp->tx_skb[i] = NULL;
 197                 }
 198         }
 199         /* Try to restart the adaptor. */
 200         sonic_init(dev);
 201         lp->stats.tx_errors++;
 202         dev->trans_start = jiffies;
 203         netif_wake_queue(dev);
 204 }
 205
 206 /*
 207  * transmit packet
 208  *
 209  * Appends new TD during transmission thus avoiding any TX interrupts
 210  * until we run out of TDs.
 211  * This routine interacts closely with the ISR in that it may,
 212  *   set tx_skb[i]
 213  *   reset the status flags of the new TD
 214  *   set and reset EOL flags
 215  *   stop the tx queue
 216  * The ISR interacts with this routine in various ways. It may,
 217  *   reset tx_skb[i]
 218  *   test the EOL and status flags of the TDs
 219  *   wake the tx queue
 220  * Concurrently with all of this, the SONIC is potentially writing to
 221  * the status flags of the TDs.
 222  * Until some mutual exclusion is added, this code will not work with SMP. However,
 223  * MIPS Jazz machines and m68k Macs were all uni-processor machines.
 224  */
 225
 226 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 227 {
 228         struct sonic_local *lp = netdev_priv(dev);
 229         dma_addr_t laddr;
 230         int length;
 231         int entry = lp->next_tx;
 232
 233         if (sonic_debug > 2)
 234                 printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);
 235
 236         length = skb->len;
 237         if (length < ETH_ZLEN) {
 238                 if (skb_padto(skb, ETH_ZLEN))
 239                         return 0;
 240                 length = ETH_ZLEN;
 241         }
 242
 243         /*
 244          * Map the packet data into the logical DMA address space
 245          */
 246
 247         laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
 248         if (!laddr) {
 249                 printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
 250                 dev_kfree_skb(skb);
 251                 return 1;
 252         }
 253
 254         sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
 255         sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
 256         sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
 257         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
 258         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
 259         sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
 260         sonic_tda_put(dev, entry, SONIC_TD_LINK,
 261                 sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
 262
 263         /*
 264          * Must set tx_skb[entry] only after clearing status, and
 265          * before clearing EOL and before stopping queue
 266          */
 267         wmb();
 268         lp->tx_len[entry] = length;
 269         lp->tx_laddr[entry] = laddr;
 270         lp->tx_skb[entry] = skb;
 271
 272         wmb();
 273         sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
 274                                   sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
 275         lp->eol_tx = entry;
 276
 277         lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
 278         if (lp->tx_skb[lp->next_tx] != NULL) {
 279                 /* The ring is full, the ISR has yet to process the next TD. */
 280                 if (sonic_debug > 3)
 281                         printk("%s: stopping queue\n", dev->name);
 282                 netif_stop_queue(dev);
 283                 /* after this packet, wait for ISR to free up some TDAs */
 284         } else netif_start_queue(dev);
 285
 286         if (sonic_debug > 2)
 287                 printk("sonic_send_packet: issuing Tx command\n");
 288
 289         SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
 290
 291         dev->trans_start = jiffies;
 292
 293         return 0;
 294 }
 295
 296 /*
 297  * The typical workload of the driver:
 298  * Handle the network interface interrupts.
 299  */
 300 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
 301 {
 302         struct net_device *dev = dev_id;
 303         struct sonic_local *lp = netdev_priv(dev);
 304         int status;
 305
 306         if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
 307                 return IRQ_NONE;
 308
 309         do {
 310                 if (status & SONIC_INT_PKTRX) {
 311                         if (sonic_debug > 2)
 312                                 printk("%s: packet rx\n", dev->name);
 313                         sonic_rx(dev);  /* got packet(s) */
 314                         SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
 315                 }
 316
 317                 if (status & SONIC_INT_TXDN) {
 318                         int entry = lp->cur_tx;
 319                         int td_status;
 320                         int freed_some = 0;
 321
 322                         /* At this point, cur_tx is the index of a TD that is one of:
 323                          *   unallocated/freed                          (status set   & tx_skb[entry] clear)
 324                          *   allocated and sent                         (status set   & tx_skb[entry] set  )
 325                          *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
 326                          *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
 327                          */
 328
 329                         if (sonic_debug > 2)
 330                                 printk("%s: tx done\n", dev->name);
 331
 332                         while (lp->tx_skb[entry] != NULL) {
 333                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
 334                                         break;
 335
 336                                 if (td_status & 0x0001) {
 337                                         lp->stats.tx_packets++;
 338                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
 339                                 } else {
 340                                         lp->stats.tx_errors++;
 341                                         if (td_status & 0x0642)
 342                                                 lp->stats.tx_aborted_errors++;
 343                                         if (td_status & 0x0180)
 344                                                 lp->stats.tx_carrier_errors++;
 345                                         if (td_status & 0x0020)
 346                                                 lp->stats.tx_window_errors++;
 347                                         if (td_status & 0x0004)
 348                                                 lp->stats.tx_fifo_errors++;
 349                                 }
 350
 351                                 /* We must free the original skb */
 352                                 dev_kfree_skb_irq(lp->tx_skb[entry]);
 353                                 lp->tx_skb[entry] = NULL;
 354                                 /* and unmap DMA buffer */
 355                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
 356                                 lp->tx_laddr[entry] = (dma_addr_t)0;
 357                                 freed_some = 1;
 358
 359                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
 360                                         entry = (entry + 1) & SONIC_TDS_MASK;
 361                                         break;
 362                                 }
 363                                 entry = (entry + 1) & SONIC_TDS_MASK;
 364                         }
 365
 366                         if (freed_some || lp->tx_skb[entry] == NULL)
 367                                 netif_wake_queue(dev);  /* The ring is no longer full */
 368                         lp->cur_tx = entry;
 369                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
 370                 }
 371
 372                 /*
 373                  * check error conditions
 374                  */
 375                 if (status & SONIC_INT_RFO) {
 376                         if (sonic_debug > 1)
 377                                 printk("%s: rx fifo overrun\n", dev->name);
 378                         lp->stats.rx_fifo_errors++;
 379                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
 380                 }
 381                 if (status & SONIC_INT_RDE) {
 382                         if (sonic_debug > 1)
 383                                 printk("%s: rx descriptors exhausted\n", dev->name);
 384                         lp->stats.rx_dropped++;
 385                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
 386                 }
 387                 if (status & SONIC_INT_RBAE) {
 388                         if (sonic_debug > 1)
 389                                 printk("%s: rx buffer area exceeded\n", dev->name);
 390                         lp->stats.rx_dropped++;
 391                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
 392                 }
 393
 394                 /* counter overruns; all counters are 16bit wide */
 395                 if (status & SONIC_INT_FAE) {
 396                         lp->stats.rx_frame_errors += 65536;
 397                         SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
 398                 }
 399                 if (status & SONIC_INT_CRC) {
 400                         lp->stats.rx_crc_errors += 65536;
 401                         SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
 402                 }
 403                 if (status & SONIC_INT_MP) {
 404                         lp->stats.rx_missed_errors += 65536;
 405                         SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
 406                 }
 407
 408                 /* transmit error */
 409                 if (status & SONIC_INT_TXER) {
 410                         if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
 411                                 printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
 412                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
 413                 }
 414
 415                 /* bus retry */
 416                 if (status & SONIC_INT_BR) {
 417                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
 418                                 dev->name);
 419                         /* ... to help debug DMA problems causing endless interrupts. */
 420                         /* Bounce the eth interface to turn on the interrupt again. */
 421                         SONIC_WRITE(SONIC_IMR, 0);
 422                         SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
 423                 }
 424
 425                 /* load CAM done */
 426                 if (status & SONIC_INT_LCD)
 427                         SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
 428         } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
 429         return IRQ_HANDLED;
 430 }
 431
 432 /*
 433  * We have a good packet(s), pass it/them up the network stack.
 434  */
 435 static void sonic_rx(struct net_device *dev)
 436 {
 437         struct sonic_local *lp = netdev_priv(dev);
 438         int status;
 439         int entry = lp->cur_rx;
 440
 441         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
 442                 struct sk_buff *used_skb;
 443                 struct sk_buff *new_skb;
 444                 dma_addr_t new_laddr;
 445                 u16 bufadr_l;
 446                 u16 bufadr_h;
 447                 int pkt_len;
 448
 449                 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
 450                 if (status & SONIC_RCR_PRX) {
 451                         /* Malloc up new buffer. */
 452                         new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
 453                         if (new_skb == NULL) {
 454                                 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
 455                                 lp->stats.rx_dropped++;
 456                                 break;
 457                         }
 458                         /* provide 16 byte IP header alignment unless DMA requires otherwise */
 459                         if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
 460                                 skb_reserve(new_skb, 2);
 461
 462                         new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
 463                                                SONIC_RBSIZE, DMA_FROM_DEVICE);
 464                         if (!new_laddr) {
 465                                 dev_kfree_skb(new_skb);
 466                                 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
 467                                 lp->stats.rx_dropped++;
 468                                 break;
 469                         }
 470
 471                         /* now we have a new skb to replace it, pass the used one up the stack */
 472                         dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
 473                         used_skb = lp->rx_skb[entry];
 474                         pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
 475                         skb_trim(used_skb, pkt_len);
 476                         used_skb->protocol = eth_type_trans(used_skb, dev);
 477                         netif_rx(used_skb);
 478                         dev->last_rx = jiffies;
 479                         lp->stats.rx_packets++;
 480                         lp->stats.rx_bytes += pkt_len;
 481
 482                         /* and insert the new skb */
 483                         lp->rx_laddr[entry] = new_laddr;
 484                         lp->rx_skb[entry] = new_skb;
 485
 486                         bufadr_l = (unsigned long)new_laddr & 0xffff;
 487                         bufadr_h = (unsigned long)new_laddr >> 16;
 488                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
 489                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
 490                 } else {
 491                         /* This should only happen, if we enable accepting broken packets. */
 492                         lp->stats.rx_errors++;
 493                         if (status & SONIC_RCR_FAER)
 494                                 lp->stats.rx_frame_errors++;
 495                         if (status & SONIC_RCR_CRCR)
 496                                 lp->stats.rx_crc_errors++;
 497                 }
 498                 if (status & SONIC_RCR_LPKT) {
 499                         /*
 500                          * this was the last packet out of the current receive buffer
 501                          * give the buffer back to the SONIC
 502                          */
 503                         lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
 504                         if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
 505                         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
 506                         if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
 507                                 if (sonic_debug > 2)
 508                                         printk("%s: rx buffer exhausted\n", dev->name);
 509                                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
 510                         }
 511                 } else
 512                         printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
 513                              dev->name);
 514                 /*
 515                  * give back the descriptor
 516                  */
 517                 sonic_rda_put(dev, entry, SONIC_RD_LINK,
 518                         sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
 519                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
 520                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
 521                         sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
 522                 lp->eol_rx = entry;
 523                 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
 524         }
 525         /*
 526          * If any worth-while packets have been received, netif_rx()
 527          * has done a mark_bh(NET_BH) for us and will work on them
 528          * when we get to the bottom-half routine.
 529          */
 530 }
 531
 532
 533 /*
 534  * Get the current statistics.
 535  * This may be called with the device open or closed.
 536  */
 537 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
 538 {
 539         struct sonic_local *lp = netdev_priv(dev);
 540
 541         /* read the tally counter from the SONIC and reset them */
 542         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
 543         SONIC_WRITE(SONIC_CRCT, 0xffff);
 544         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
 545         SONIC_WRITE(SONIC_FAET, 0xffff);
 546         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
 547         SONIC_WRITE(SONIC_MPT, 0xffff);
 548
 549         return &lp->stats;
 550 }
 551
 552
 553 /*
 554  * Set or clear the multicast filter for this adaptor.
 555  */
 556 static void sonic_multicast_list(struct net_device *dev)
 557 {
 558         struct sonic_local *lp = netdev_priv(dev);
 559         unsigned int rcr;
 560         struct dev_mc_list *dmi = dev->mc_list;
 561         unsigned char *addr;
 562         int i;
 563
 564         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
 565         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
 566
 567         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
 568                 rcr |= SONIC_RCR_PRO;
 569         } else {
 570                 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
 571                         rcr |= SONIC_RCR_AMC;
 572                 } else {
 573                         if (sonic_debug > 2)
 574                                 printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
 575                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
 576                         for (i = 1; i <= dev->mc_count; i++) {
 577                                 addr = dmi->dmi_addr;
 578                                 dmi = dmi->next;
 579                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
 580                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
 581                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
 582                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
 583                         }
 584                         SONIC_WRITE(SONIC_CDC, 16);
 585                         /* issue Load CAM command */
 586                         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 587                         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 588                 }
 589         }
 590
 591         if (sonic_debug > 2)
 592                 printk("sonic_multicast_list: setting RCR=%x\n", rcr);
 593
 594         SONIC_WRITE(SONIC_RCR, rcr);
 595 }
 596
 597
 598 /*
 599  * Initialize the SONIC ethernet controller.
 600  */
 601 static int sonic_init(struct net_device *dev)
 602 {
 603         unsigned int cmd;
 604         struct sonic_local *lp = netdev_priv(dev);
 605         int i;
 606
 607         /*
 608          * put the Sonic into software-reset mode and
 609          * disable all interrupts
 610          */
 611         SONIC_WRITE(SONIC_IMR, 0);
 612         SONIC_WRITE(SONIC_ISR, 0x7fff);
 613         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 614
 615         /*
 616          * clear software reset flag, disable receiver, clear and
 617          * enable interrupts, then completely initialize the SONIC
 618          */
 619         SONIC_WRITE(SONIC_CMD, 0);
 620         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
 621
 622         /*
 623          * initialize the receive resource area
 624          */
 625         if (sonic_debug > 2)
 626                 printk("sonic_init: initialize receive resource area\n");
 627
 628         for (i = 0; i < SONIC_NUM_RRS; i++) {
 629                 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
 630                 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
 631                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
 632                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
 633                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
 634                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
 635         }
 636
 637         /* initialize all RRA registers */
 638         lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
 639                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
 640         lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
 641                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
 642
 643         SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
 644         SONIC_WRITE(SONIC_REA, lp->rra_end);
 645         SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
 646         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
 647         SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
 648         SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
 649
 650         /* load the resource pointers */
 651         if (sonic_debug > 3)
 652                 printk("sonic_init: issuing RRRA command\n");
 653
 654         SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
 655         i = 0;
 656         while (i++ < 100) {
 657                 if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
 658                         break;
 659         }
 660
 661         if (sonic_debug > 2)
 662                 printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
 663
 664         /*
 665          * Initialize the receive descriptors so that they
 666          * become a circular linked list, ie. let the last
 667          * descriptor point to the first again.
 668          */
 669         if (sonic_debug > 2)
 670                 printk("sonic_init: initialize receive descriptors\n");
 671         for (i=0; i<SONIC_NUM_RDS; i++) {
 672                 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
 673                 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
 674                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
 675                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
 676                 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
 677                 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
 678                 sonic_rda_put(dev, i, SONIC_RD_LINK,
 679                         lp->rda_laddr +
 680                         ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
 681         }
 682         /* fix last descriptor */
 683         sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
 684                 (lp->rda_laddr & 0xffff) | SONIC_EOL);
 685         lp->eol_rx = SONIC_NUM_RDS - 1;
 686         lp->cur_rx = 0;
 687         SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
 688         SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
 689
 690         /*
 691          * initialize transmit descriptors
 692          */
 693         if (sonic_debug > 2)
 694                 printk("sonic_init: initialize transmit descriptors\n");
 695         for (i = 0; i < SONIC_NUM_TDS; i++) {
 696                 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
 697                 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
 698                 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
 699                 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
 700                 sonic_tda_put(dev, i, SONIC_TD_LINK,
 701                         (lp->tda_laddr & 0xffff) +
 702                         (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
 703                 lp->tx_skb[i] = NULL;
 704         }
 705         /* fix last descriptor */
 706         sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
 707                 (lp->tda_laddr & 0xffff));
 708
 709         SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
 710         SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
 711         lp->cur_tx = lp->next_tx = 0;
 712         lp->eol_tx = SONIC_NUM_TDS - 1;
 713
 714         /*
 715          * put our own address to CAM desc[0]
 716          */
 717         sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
 718         sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
 719         sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
 720         sonic_set_cam_enable(dev, 1);
 721
 722         for (i = 0; i < 16; i++)
 723                 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
 724
 725         /*
 726          * initialize CAM registers
 727          */
 728         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 729         SONIC_WRITE(SONIC_CDC, 16);
 730
 731         /*
 732          * load the CAM
 733          */
 734         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 735
 736         i = 0;
 737         while (i++ < 100) {
 738                 if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
 739                         break;
 740         }
 741         if (sonic_debug > 2) {
 742                 printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
 743                        SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
 744         }
 745
 746         /*
 747          * enable receiver, disable loopback
 748          * and enable all interrupts
 749          */
 750         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
 751         SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
 752         SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
 753         SONIC_WRITE(SONIC_ISR, 0x7fff);
 754         SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
 755
 756         cmd = SONIC_READ(SONIC_CMD);
 757         if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
 758                 printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
 759
 760         if (sonic_debug > 2)
 761                 printk("sonic_init: new status=%x\n",
 762                        SONIC_READ(SONIC_CMD));
 763
 764         return 0;
 765 }
 766
 767 MODULE_LICENSE("GPL");