drivers/net/sonic.c

   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         /* Stop the interrupts for this */
 182         SONIC_WRITE(SONIC_IMR, 0);
 183         /* We could resend the original skbs. Easier to re-initialise. */
 184         for (i = 0; i < SONIC_NUM_TDS; i++) {
 185                 if(lp->tx_laddr[i]) {
 186                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 187                         lp->tx_laddr[i] = (dma_addr_t)0;
 188                 }
 189                 if(lp->tx_skb[i]) {
 190                         dev_kfree_skb(lp->tx_skb[i]);
 191                         lp->tx_skb[i] = NULL;
 192                 }
 193         }
 194         /* Try to restart the adaptor. */
 195         sonic_init(dev);
 196         lp->stats.tx_errors++;
 197         dev->trans_start = jiffies;
 198         netif_wake_queue(dev);
 199 }
 200
 201 /*
 202  * transmit packet
 203  *
 204  * Appends new TD during transmission thus avoiding any TX interrupts
 205  * until we run out of TDs.
 206  * This routine interacts closely with the ISR in that it may,
 207  *   set tx_skb[i]
 208  *   reset the status flags of the new TD
 209  *   set and reset EOL flags
 210  *   stop the tx queue
 211  * The ISR interacts with this routine in various ways. It may,
 212  *   reset tx_skb[i]
 213  *   test the EOL and status flags of the TDs
 214  *   wake the tx queue
 215  * Concurrently with all of this, the SONIC is potentially writing to
 216  * the status flags of the TDs.
 217  * Until some mutual exclusion is added, this code will not work with SMP. However,
 218  * MIPS Jazz machines and m68k Macs were all uni-processor machines.
 219  */
 220
 221 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 222 {
 223         struct sonic_local *lp = netdev_priv(dev);
 224         dma_addr_t laddr;
 225         int length;
 226         int entry = lp->next_tx;
 227
 228         if (sonic_debug > 2)
 229                 printk("sonic_send_packet: skb=%p, dev=%p\n", skb, dev);
 230
 231         length = skb->len;
 232         if (length < ETH_ZLEN) {
 233                 if (skb_padto(skb, ETH_ZLEN))
 234                         return 0;
 235                 length = ETH_ZLEN;
 236         }
 237
 238         /*
 239          * Map the packet data into the logical DMA address space
 240          */
 241
 242         laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
 243         if (!laddr) {
 244                 printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", dev->name);
 245                 dev_kfree_skb(skb);
 246                 return 1;
 247         }
 248
 249         sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
 250         sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
 251         sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
 252         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
 253         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
 254         sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
 255         sonic_tda_put(dev, entry, SONIC_TD_LINK,
 256                 sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
 257
 258         /*
 259          * Must set tx_skb[entry] only after clearing status, and
 260          * before clearing EOL and before stopping queue
 261          */
 262         wmb();
 263         lp->tx_len[entry] = length;
 264         lp->tx_laddr[entry] = laddr;
 265         lp->tx_skb[entry] = skb;
 266
 267         wmb();
 268         sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
 269                                   sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
 270         lp->eol_tx = entry;
 271
 272         lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
 273         if (lp->tx_skb[lp->next_tx] != NULL) {
 274                 /* The ring is full, the ISR has yet to process the next TD. */
 275                 if (sonic_debug > 3)
 276                         printk("%s: stopping queue\n", dev->name);
 277                 netif_stop_queue(dev);
 278                 /* after this packet, wait for ISR to free up some TDAs */
 279         } else netif_start_queue(dev);
 280
 281         if (sonic_debug > 2)
 282                 printk("sonic_send_packet: issuing Tx command\n");
 283
 284         SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
 285
 286         dev->trans_start = jiffies;
 287
 288         return 0;
 289 }
 290
 291 /*
 292  * The typical workload of the driver:
 293  * Handle the network interface interrupts.
 294  */
 295 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
 296 {
 297         struct net_device *dev = dev_id;
 298         struct sonic_local *lp = netdev_priv(dev);
 299         int status;
 300
 301         if (!(status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT))
 302                 return IRQ_NONE;
 303
 304         do {
 305                 if (status & SONIC_INT_PKTRX) {
 306                         if (sonic_debug > 2)
 307                                 printk("%s: packet rx\n", dev->name);
 308                         sonic_rx(dev);  /* got packet(s) */
 309                         SONIC_WRITE(SONIC_ISR, SONIC_INT_PKTRX); /* clear the interrupt */
 310                 }
 311
 312                 if (status & SONIC_INT_TXDN) {
 313                         int entry = lp->cur_tx;
 314                         int td_status;
 315                         int freed_some = 0;
 316
 317                         /* At this point, cur_tx is the index of a TD that is one of:
 318                          *   unallocated/freed                          (status set   & tx_skb[entry] clear)
 319                          *   allocated and sent                         (status set   & tx_skb[entry] set  )
 320                          *   allocated and not yet sent                 (status clear & tx_skb[entry] set  )
 321                          *   still being allocated by sonic_send_packet (status clear & tx_skb[entry] clear)
 322                          */
 323
 324                         if (sonic_debug > 2)
 325                                 printk("%s: tx done\n", dev->name);
 326
 327                         while (lp->tx_skb[entry] != NULL) {
 328                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
 329                                         break;
 330
 331                                 if (td_status & 0x0001) {
 332                                         lp->stats.tx_packets++;
 333                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
 334                                 } else {
 335                                         lp->stats.tx_errors++;
 336                                         if (td_status & 0x0642)
 337                                                 lp->stats.tx_aborted_errors++;
 338                                         if (td_status & 0x0180)
 339                                                 lp->stats.tx_carrier_errors++;
 340                                         if (td_status & 0x0020)
 341                                                 lp->stats.tx_window_errors++;
 342                                         if (td_status & 0x0004)
 343                                                 lp->stats.tx_fifo_errors++;
 344                                 }
 345
 346                                 /* We must free the original skb */
 347                                 dev_kfree_skb_irq(lp->tx_skb[entry]);
 348                                 lp->tx_skb[entry] = NULL;
 349                                 /* and unmap DMA buffer */
 350                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
 351                                 lp->tx_laddr[entry] = (dma_addr_t)0;
 352                                 freed_some = 1;
 353
 354                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
 355                                         entry = (entry + 1) & SONIC_TDS_MASK;
 356                                         break;
 357                                 }
 358                                 entry = (entry + 1) & SONIC_TDS_MASK;
 359                         }
 360
 361                         if (freed_some || lp->tx_skb[entry] == NULL)
 362                                 netif_wake_queue(dev);  /* The ring is no longer full */
 363                         lp->cur_tx = entry;
 364                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXDN); /* clear the interrupt */
 365                 }
 366
 367                 /*
 368                  * check error conditions
 369                  */
 370                 if (status & SONIC_INT_RFO) {
 371                         if (sonic_debug > 1)
 372                                 printk("%s: rx fifo overrun\n", dev->name);
 373                         lp->stats.rx_fifo_errors++;
 374                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RFO); /* clear the interrupt */
 375                 }
 376                 if (status & SONIC_INT_RDE) {
 377                         if (sonic_debug > 1)
 378                                 printk("%s: rx descriptors exhausted\n", dev->name);
 379                         lp->stats.rx_dropped++;
 380                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RDE); /* clear the interrupt */
 381                 }
 382                 if (status & SONIC_INT_RBAE) {
 383                         if (sonic_debug > 1)
 384                                 printk("%s: rx buffer area exceeded\n", dev->name);
 385                         lp->stats.rx_dropped++;
 386                         SONIC_WRITE(SONIC_ISR, SONIC_INT_RBAE); /* clear the interrupt */
 387                 }
 388
 389                 /* counter overruns; all counters are 16bit wide */
 390                 if (status & SONIC_INT_FAE) {
 391                         lp->stats.rx_frame_errors += 65536;
 392                         SONIC_WRITE(SONIC_ISR, SONIC_INT_FAE); /* clear the interrupt */
 393                 }
 394                 if (status & SONIC_INT_CRC) {
 395                         lp->stats.rx_crc_errors += 65536;
 396                         SONIC_WRITE(SONIC_ISR, SONIC_INT_CRC); /* clear the interrupt */
 397                 }
 398                 if (status & SONIC_INT_MP) {
 399                         lp->stats.rx_missed_errors += 65536;
 400                         SONIC_WRITE(SONIC_ISR, SONIC_INT_MP); /* clear the interrupt */
 401                 }
 402
 403                 /* transmit error */
 404                 if (status & SONIC_INT_TXER) {
 405                         if ((SONIC_READ(SONIC_TCR) & SONIC_TCR_FU) && (sonic_debug > 2))
 406                                 printk(KERN_ERR "%s: tx fifo underrun\n", dev->name);
 407                         SONIC_WRITE(SONIC_ISR, SONIC_INT_TXER); /* clear the interrupt */
 408                 }
 409
 410                 /* bus retry */
 411                 if (status & SONIC_INT_BR) {
 412                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
 413                                 dev->name);
 414                         /* ... to help debug DMA problems causing endless interrupts. */
 415                         /* Bounce the eth interface to turn on the interrupt again. */
 416                         SONIC_WRITE(SONIC_IMR, 0);
 417                         SONIC_WRITE(SONIC_ISR, SONIC_INT_BR); /* clear the interrupt */
 418                 }
 419
 420                 /* load CAM done */
 421                 if (status & SONIC_INT_LCD)
 422                         SONIC_WRITE(SONIC_ISR, SONIC_INT_LCD); /* clear the interrupt */
 423         } while((status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT));
 424         return IRQ_HANDLED;
 425 }
 426
 427 /*
 428  * We have a good packet(s), pass it/them up the network stack.
 429  */
 430 static void sonic_rx(struct net_device *dev)
 431 {
 432         struct sonic_local *lp = netdev_priv(dev);
 433         int status;
 434         int entry = lp->cur_rx;
 435
 436         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
 437                 struct sk_buff *used_skb;
 438                 struct sk_buff *new_skb;
 439                 dma_addr_t new_laddr;
 440                 u16 bufadr_l;
 441                 u16 bufadr_h;
 442                 int pkt_len;
 443
 444                 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
 445                 if (status & SONIC_RCR_PRX) {
 446                         /* Malloc up new buffer. */
 447                         new_skb = dev_alloc_skb(SONIC_RBSIZE + 2);
 448                         if (new_skb == NULL) {
 449                                 printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", dev->name);
 450                                 lp->stats.rx_dropped++;
 451                                 break;
 452                         }
 453                         /* provide 16 byte IP header alignment unless DMA requires otherwise */
 454                         if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
 455                                 skb_reserve(new_skb, 2);
 456
 457                         new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
 458                                                SONIC_RBSIZE, DMA_FROM_DEVICE);
 459                         if (!new_laddr) {
 460                                 dev_kfree_skb(new_skb);
 461                                 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
 462                                 lp->stats.rx_dropped++;
 463                                 break;
 464                         }
 465
 466                         /* now we have a new skb to replace it, pass the used one up the stack */
 467                         dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
 468                         used_skb = lp->rx_skb[entry];
 469                         pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
 470                         skb_trim(used_skb, pkt_len);
 471                         used_skb->protocol = eth_type_trans(used_skb, dev);
 472                         netif_rx(used_skb);
 473                         dev->last_rx = jiffies;
 474                         lp->stats.rx_packets++;
 475                         lp->stats.rx_bytes += pkt_len;
 476
 477                         /* and insert the new skb */
 478                         lp->rx_laddr[entry] = new_laddr;
 479                         lp->rx_skb[entry] = new_skb;
 480
 481                         bufadr_l = (unsigned long)new_laddr & 0xffff;
 482                         bufadr_h = (unsigned long)new_laddr >> 16;
 483                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
 484                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
 485                 } else {
 486                         /* This should only happen, if we enable accepting broken packets. */
 487                         lp->stats.rx_errors++;
 488                         if (status & SONIC_RCR_FAER)
 489                                 lp->stats.rx_frame_errors++;
 490                         if (status & SONIC_RCR_CRCR)
 491                                 lp->stats.rx_crc_errors++;
 492                 }
 493                 if (status & SONIC_RCR_LPKT) {
 494                         /*
 495                          * this was the last packet out of the current receive buffer
 496                          * give the buffer back to the SONIC
 497                          */
 498                         lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
 499                         if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
 500                         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
 501                         if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
 502                                 if (sonic_debug > 2)
 503                                         printk("%s: rx buffer exhausted\n", dev->name);
 504                                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
 505                         }
 506                 } else
 507                         printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
 508                              dev->name);
 509                 /*
 510                  * give back the descriptor
 511                  */
 512                 sonic_rda_put(dev, entry, SONIC_RD_LINK,
 513                         sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
 514                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
 515                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
 516                         sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
 517                 lp->eol_rx = entry;
 518                 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
 519         }
 520         /*
 521          * If any worth-while packets have been received, netif_rx()
 522          * has done a mark_bh(NET_BH) for us and will work on them
 523          * when we get to the bottom-half routine.
 524          */
 525 }
 526
 527
 528 /*
 529  * Get the current statistics.
 530  * This may be called with the device open or closed.
 531  */
 532 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
 533 {
 534         struct sonic_local *lp = netdev_priv(dev);
 535
 536         /* read the tally counter from the SONIC and reset them */
 537         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
 538         SONIC_WRITE(SONIC_CRCT, 0xffff);
 539         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
 540         SONIC_WRITE(SONIC_FAET, 0xffff);
 541         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
 542         SONIC_WRITE(SONIC_MPT, 0xffff);
 543
 544         return &lp->stats;
 545 }
 546
 547
 548 /*
 549  * Set or clear the multicast filter for this adaptor.
 550  */
 551 static void sonic_multicast_list(struct net_device *dev)
 552 {
 553         struct sonic_local *lp = netdev_priv(dev);
 554         unsigned int rcr;
 555         struct dev_mc_list *dmi = dev->mc_list;
 556         unsigned char *addr;
 557         int i;
 558
 559         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
 560         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
 561
 562         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
 563                 rcr |= SONIC_RCR_PRO;
 564         } else {
 565                 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 15)) {
 566                         rcr |= SONIC_RCR_AMC;
 567                 } else {
 568                         if (sonic_debug > 2)
 569                                 printk("sonic_multicast_list: mc_count %d\n", dev->mc_count);
 570                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
 571                         for (i = 1; i <= dev->mc_count; i++) {
 572                                 addr = dmi->dmi_addr;
 573                                 dmi = dmi->next;
 574                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
 575                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
 576                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
 577                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
 578                         }
 579                         SONIC_WRITE(SONIC_CDC, 16);
 580                         /* issue Load CAM command */
 581                         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 582                         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 583                 }
 584         }
 585
 586         if (sonic_debug > 2)
 587                 printk("sonic_multicast_list: setting RCR=%x\n", rcr);
 588
 589         SONIC_WRITE(SONIC_RCR, rcr);
 590 }
 591
 592
 593 /*
 594  * Initialize the SONIC ethernet controller.
 595  */
 596 static int sonic_init(struct net_device *dev)
 597 {
 598         unsigned int cmd;
 599         struct sonic_local *lp = netdev_priv(dev);
 600         int i;
 601
 602         /*
 603          * put the Sonic into software-reset mode and
 604          * disable all interrupts
 605          */
 606         SONIC_WRITE(SONIC_IMR, 0);
 607         SONIC_WRITE(SONIC_ISR, 0x7fff);
 608         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 609
 610         /*
 611          * clear software reset flag, disable receiver, clear and
 612          * enable interrupts, then completely initialize the SONIC
 613          */
 614         SONIC_WRITE(SONIC_CMD, 0);
 615         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
 616
 617         /*
 618          * initialize the receive resource area
 619          */
 620         if (sonic_debug > 2)
 621                 printk("sonic_init: initialize receive resource area\n");
 622
 623         for (i = 0; i < SONIC_NUM_RRS; i++) {
 624                 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
 625                 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
 626                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
 627                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
 628                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
 629                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
 630         }
 631
 632         /* initialize all RRA registers */
 633         lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
 634                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
 635         lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
 636                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
 637
 638         SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
 639         SONIC_WRITE(SONIC_REA, lp->rra_end);
 640         SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
 641         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
 642         SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
 643         SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
 644
 645         /* load the resource pointers */
 646         if (sonic_debug > 3)
 647                 printk("sonic_init: issuing RRRA command\n");
 648
 649         SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
 650         i = 0;
 651         while (i++ < 100) {
 652                 if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
 653                         break;
 654         }
 655
 656         if (sonic_debug > 2)
 657                 printk("sonic_init: status=%x i=%d\n", SONIC_READ(SONIC_CMD), i);
 658
 659         /*
 660          * Initialize the receive descriptors so that they
 661          * become a circular linked list, ie. let the last
 662          * descriptor point to the first again.
 663          */
 664         if (sonic_debug > 2)
 665                 printk("sonic_init: initialize receive descriptors\n");
 666         for (i=0; i<SONIC_NUM_RDS; i++) {
 667                 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
 668                 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
 669                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
 670                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
 671                 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
 672                 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
 673                 sonic_rda_put(dev, i, SONIC_RD_LINK,
 674                         lp->rda_laddr +
 675                         ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
 676         }
 677         /* fix last descriptor */
 678         sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
 679                 (lp->rda_laddr & 0xffff) | SONIC_EOL);
 680         lp->eol_rx = SONIC_NUM_RDS - 1;
 681         lp->cur_rx = 0;
 682         SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
 683         SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
 684
 685         /*
 686          * initialize transmit descriptors
 687          */
 688         if (sonic_debug > 2)
 689                 printk("sonic_init: initialize transmit descriptors\n");
 690         for (i = 0; i < SONIC_NUM_TDS; i++) {
 691                 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
 692                 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
 693                 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
 694                 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
 695                 sonic_tda_put(dev, i, SONIC_TD_LINK,
 696                         (lp->tda_laddr & 0xffff) +
 697                         (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
 698                 lp->tx_skb[i] = NULL;
 699         }
 700         /* fix last descriptor */
 701         sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
 702                 (lp->tda_laddr & 0xffff));
 703
 704         SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
 705         SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
 706         lp->cur_tx = lp->next_tx = 0;
 707         lp->eol_tx = SONIC_NUM_TDS - 1;
 708
 709         /*
 710          * put our own address to CAM desc[0]
 711          */
 712         sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
 713         sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
 714         sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
 715         sonic_set_cam_enable(dev, 1);
 716
 717         for (i = 0; i < 16; i++)
 718                 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
 719
 720         /*
 721          * initialize CAM registers
 722          */
 723         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 724         SONIC_WRITE(SONIC_CDC, 16);
 725
 726         /*
 727          * load the CAM
 728          */
 729         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 730
 731         i = 0;
 732         while (i++ < 100) {
 733                 if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
 734                         break;
 735         }
 736         if (sonic_debug > 2) {
 737                 printk("sonic_init: CMD=%x, ISR=%x\n, i=%d",
 738                        SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
 739         }
 740
 741         /*
 742          * enable receiver, disable loopback
 743          * and enable all interrupts
 744          */
 745         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
 746         SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
 747         SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
 748         SONIC_WRITE(SONIC_ISR, 0x7fff);
 749         SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
 750
 751         cmd = SONIC_READ(SONIC_CMD);
 752         if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
 753                 printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
 754
 755         if (sonic_debug > 2)
 756                 printk("sonic_init: new status=%x\n",
 757                        SONIC_READ(SONIC_CMD));
 758
 759         return 0;
 760 }
 761
 762 MODULE_LICENSE("GPL");