drivers/net/ethernet/natsemi/sonic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sonic.c
   4  *
   5  * (C) 2005 Finn Thain
   6  *
   7  * Converted to DMA API, added zero-copy buffer handling, and
   8  * (from the mac68k project) introduced dhd's support for 16-bit cards.
   9  *
  10  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  11  *
  12  * This driver is based on work from Andreas Busse, but most of
  13  * the code is rewritten.
  14  *
  15  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
  16  *
  17  *    Core code included by system sonic drivers
  18  *
  19  * And... partially rewritten again by David Huggins-Daines in order
  20  * to cope with screwed up Macintosh NICs that may or may not use
  21  * 16-bit DMA.
  22  *
  23  * (C) 1999 David Huggins-Daines <dhd@debian.org>
  24  *
  25  */
  26
  27 /*
  28  * Sources: Olivetti M700-10 Risc Personal Computer hardware handbook,
  29  * National Semiconductors data sheet for the DP83932B Sonic Ethernet
  30  * controller, and the files "8390.c" and "skeleton.c" in this directory.
  31  *
  32  * Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi
  33  * Application Note AN-746, the files "lance.c" and "ibmlana.c". See also
  34  * the NetBSD file "sys/arch/mac68k/dev/if_sn.c".
  35  */
  36
  37 static unsigned int version_printed;
  38
  39 static int sonic_debug = -1;
  40 module_param(sonic_debug, int, 0);
  41 MODULE_PARM_DESC(sonic_debug, "debug message level");
  42
  43 static void sonic_msg_init(struct net_device *dev)
  44 {
  45         struct sonic_local *lp = netdev_priv(dev);
  46
  47         lp->msg_enable = netif_msg_init(sonic_debug, 0);
  48
  49         if (version_printed++ == 0)
  50                 netif_dbg(lp, drv, dev, "%s", version);
  51 }
  52
  53 /*
  54  * Open/initialize the SONIC controller.
  55  *
  56  * This routine should set everything up anew at each open, even
  57  *  registers that "should" only need to be set once at boot, so that
  58  *  there is non-reboot way to recover if something goes wrong.
  59  */
  60 static int sonic_open(struct net_device *dev)
  61 {
  62         struct sonic_local *lp = netdev_priv(dev);
  63         int i;
  64
  65         netif_dbg(lp, ifup, dev, "%s: initializing sonic driver\n", __func__);
  66
  67         spin_lock_init(&lp->lock);
  68
  69         for (i = 0; i < SONIC_NUM_RRS; i++) {
  70                 struct sk_buff *skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
  71                 if (skb == NULL) {
  72                         while(i > 0) { /* free any that were allocated successfully */
  73                                 i--;
  74                                 dev_kfree_skb(lp->rx_skb[i]);
  75                                 lp->rx_skb[i] = NULL;
  76                         }
  77                         printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
  78                                dev->name);
  79                         return -ENOMEM;
  80                 }
  81                 /* align IP header unless DMA requires otherwise */
  82                 if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
  83                         skb_reserve(skb, 2);
  84                 lp->rx_skb[i] = skb;
  85         }
  86
  87         for (i = 0; i < SONIC_NUM_RRS; i++) {
  88                 dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
  89                                                   SONIC_RBSIZE, DMA_FROM_DEVICE);
  90                 if (dma_mapping_error(lp->device, laddr)) {
  91                         while(i > 0) { /* free any that were mapped successfully */
  92                                 i--;
  93                                 dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
  94                                 lp->rx_laddr[i] = (dma_addr_t)0;
  95                         }
  96                         for (i = 0; i < SONIC_NUM_RRS; i++) {
  97                                 dev_kfree_skb(lp->rx_skb[i]);
  98                                 lp->rx_skb[i] = NULL;
  99                         }
 100                         printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
 101                                dev->name);
 102                         return -ENOMEM;
 103                 }
 104                 lp->rx_laddr[i] = laddr;
 105         }
 106
 107         /*
 108          * Initialize the SONIC
 109          */
 110         sonic_init(dev);
 111
 112         netif_start_queue(dev);
 113
 114         netif_dbg(lp, ifup, dev, "%s: Initialization done\n", __func__);
 115
 116         return 0;
 117 }
 118
 119
 120 /*
 121  * Close the SONIC device
 122  */
 123 static int sonic_close(struct net_device *dev)
 124 {
 125         struct sonic_local *lp = netdev_priv(dev);
 126         int i;
 127
 128         netif_dbg(lp, ifdown, dev, "%s\n", __func__);
 129
 130         netif_stop_queue(dev);
 131
 132         /*
 133          * stop the SONIC, disable interrupts
 134          */
 135         SONIC_WRITE(SONIC_IMR, 0);
 136         SONIC_WRITE(SONIC_ISR, 0x7fff);
 137         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 138
 139         /* unmap and free skbs that haven't been transmitted */
 140         for (i = 0; i < SONIC_NUM_TDS; i++) {
 141                 if(lp->tx_laddr[i]) {
 142                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 143                         lp->tx_laddr[i] = (dma_addr_t)0;
 144                 }
 145                 if(lp->tx_skb[i]) {
 146                         dev_kfree_skb(lp->tx_skb[i]);
 147                         lp->tx_skb[i] = NULL;
 148                 }
 149         }
 150
 151         /* unmap and free the receive buffers */
 152         for (i = 0; i < SONIC_NUM_RRS; i++) {
 153                 if(lp->rx_laddr[i]) {
 154                         dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
 155                         lp->rx_laddr[i] = (dma_addr_t)0;
 156                 }
 157                 if(lp->rx_skb[i]) {
 158                         dev_kfree_skb(lp->rx_skb[i]);
 159                         lp->rx_skb[i] = NULL;
 160                 }
 161         }
 162
 163         return 0;
 164 }
 165
 166 static void sonic_tx_timeout(struct net_device *dev)
 167 {
 168         struct sonic_local *lp = netdev_priv(dev);
 169         int i;
 170         /*
 171          * put the Sonic into software-reset mode and
 172          * disable all interrupts before releasing DMA buffers
 173          */
 174         SONIC_WRITE(SONIC_IMR, 0);
 175         SONIC_WRITE(SONIC_ISR, 0x7fff);
 176         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 177         /* We could resend the original skbs. Easier to re-initialise. */
 178         for (i = 0; i < SONIC_NUM_TDS; i++) {
 179                 if(lp->tx_laddr[i]) {
 180                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 181                         lp->tx_laddr[i] = (dma_addr_t)0;
 182                 }
 183                 if(lp->tx_skb[i]) {
 184                         dev_kfree_skb(lp->tx_skb[i]);
 185                         lp->tx_skb[i] = NULL;
 186                 }
 187         }
 188         /* Try to restart the adaptor. */
 189         sonic_init(dev);
 190         lp->stats.tx_errors++;
 191         netif_trans_update(dev); /* prevent tx timeout */
 192         netif_wake_queue(dev);
 193 }
 194
 195 /*
 196  * transmit packet
 197  *
 198  * Appends new TD during transmission thus avoiding any TX interrupts
 199  * until we run out of TDs.
 200  * This routine interacts closely with the ISR in that it may,
 201  *   set tx_skb[i]
 202  *   reset the status flags of the new TD
 203  *   set and reset EOL flags
 204  *   stop the tx queue
 205  * The ISR interacts with this routine in various ways. It may,
 206  *   reset tx_skb[i]
 207  *   test the EOL and status flags of the TDs
 208  *   wake the tx queue
 209  * Concurrently with all of this, the SONIC is potentially writing to
 210  * the status flags of the TDs.
 211  */
 212
 213 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 214 {
 215         struct sonic_local *lp = netdev_priv(dev);
 216         dma_addr_t laddr;
 217         int length;
 218         int entry;
 219         unsigned long flags;
 220
 221         netif_dbg(lp, tx_queued, dev, "%s: skb=%p\n", __func__, skb);
 222
 223         length = skb->len;
 224         if (length < ETH_ZLEN) {
 225                 if (skb_padto(skb, ETH_ZLEN))
 226                         return NETDEV_TX_OK;
 227                 length = ETH_ZLEN;
 228         }
 229
 230         /*
 231          * Map the packet data into the logical DMA address space
 232          */
 233
 234         laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
 235         if (!laddr) {
 236                 pr_err_ratelimited("%s: failed to map tx DMA buffer.\n", dev->name);
 237                 dev_kfree_skb_any(skb);
 238                 return NETDEV_TX_OK;
 239         }
 240
 241         spin_lock_irqsave(&lp->lock, flags);
 242
 243         entry = lp->next_tx;
 244
 245         sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
 246         sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
 247         sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
 248         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
 249         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
 250         sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
 251         sonic_tda_put(dev, entry, SONIC_TD_LINK,
 252                 sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
 253
 254         wmb();
 255         lp->tx_len[entry] = length;
 256         lp->tx_laddr[entry] = laddr;
 257         lp->tx_skb[entry] = skb;
 258
 259         wmb();
 260         sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
 261                                   sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
 262         lp->eol_tx = entry;
 263
 264         lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
 265         if (lp->tx_skb[lp->next_tx] != NULL) {
 266                 /* The ring is full, the ISR has yet to process the next TD. */
 267                 netif_dbg(lp, tx_queued, dev, "%s: stopping queue\n", __func__);
 268                 netif_stop_queue(dev);
 269                 /* after this packet, wait for ISR to free up some TDAs */
 270         } else netif_start_queue(dev);
 271
 272         netif_dbg(lp, tx_queued, dev, "%s: issuing Tx command\n", __func__);
 273
 274         SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
 275
 276         spin_unlock_irqrestore(&lp->lock, flags);
 277
 278         return NETDEV_TX_OK;
 279 }
 280
 281 /*
 282  * The typical workload of the driver:
 283  * Handle the network interface interrupts.
 284  */
 285 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
 286 {
 287         struct net_device *dev = dev_id;
 288         struct sonic_local *lp = netdev_priv(dev);
 289         int status;
 290         unsigned long flags;
 291
 292         /* The lock has two purposes. Firstly, it synchronizes sonic_interrupt()
 293          * with sonic_send_packet() so that the two functions can share state.
 294          * Secondly, it makes sonic_interrupt() re-entrant, as that is required
 295          * by macsonic which must use two IRQs with different priority levels.
 296          */
 297         spin_lock_irqsave(&lp->lock, flags);
 298
 299         status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT;
 300         if (!status) {
 301                 spin_unlock_irqrestore(&lp->lock, flags);
 302
 303                 return IRQ_NONE;
 304         }
 305
 306         do {
 307                 SONIC_WRITE(SONIC_ISR, status); /* clear the interrupt(s) */
 308
 309                 if (status & SONIC_INT_PKTRX) {
 310                         netif_dbg(lp, intr, dev, "%s: packet rx\n", __func__);
 311                         sonic_rx(dev);  /* got packet(s) */
 312                 }
 313
 314                 if (status & SONIC_INT_TXDN) {
 315                         int entry = lp->cur_tx;
 316                         int td_status;
 317                         int freed_some = 0;
 318
 319                         /* The state of a Transmit Descriptor may be inferred
 320                          * from { tx_skb[entry], td_status } as follows.
 321                          * { clear, clear } => the TD has never been used
 322                          * { set,   clear } => the TD was handed to SONIC
 323                          * { set,   set   } => the TD was handed back
 324                          * { clear, set   } => the TD is available for re-use
 325                          */
 326
 327                         netif_dbg(lp, intr, dev, "%s: tx done\n", __func__);
 328
 329                         while (lp->tx_skb[entry] != NULL) {
 330                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
 331                                         break;
 332
 333                                 if (td_status & SONIC_TCR_PTX) {
 334                                         lp->stats.tx_packets++;
 335                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
 336                                 } else {
 337                                         if (td_status & (SONIC_TCR_EXD |
 338                                             SONIC_TCR_EXC | SONIC_TCR_BCM))
 339                                                 lp->stats.tx_aborted_errors++;
 340                                         if (td_status &
 341                                             (SONIC_TCR_NCRS | SONIC_TCR_CRLS))
 342                                                 lp->stats.tx_carrier_errors++;
 343                                         if (td_status & SONIC_TCR_OWC)
 344                                                 lp->stats.tx_window_errors++;
 345                                         if (td_status & SONIC_TCR_FU)
 346                                                 lp->stats.tx_fifo_errors++;
 347                                 }
 348
 349                                 /* We must free the original skb */
 350                                 dev_consume_skb_irq(lp->tx_skb[entry]);
 351                                 lp->tx_skb[entry] = NULL;
 352                                 /* and unmap DMA buffer */
 353                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
 354                                 lp->tx_laddr[entry] = (dma_addr_t)0;
 355                                 freed_some = 1;
 356
 357                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
 358                                         entry = (entry + 1) & SONIC_TDS_MASK;
 359                                         break;
 360                                 }
 361                                 entry = (entry + 1) & SONIC_TDS_MASK;
 362                         }
 363
 364                         if (freed_some || lp->tx_skb[entry] == NULL)
 365                                 netif_wake_queue(dev);  /* The ring is no longer full */
 366                         lp->cur_tx = entry;
 367                 }
 368
 369                 /*
 370                  * check error conditions
 371                  */
 372                 if (status & SONIC_INT_RFO) {
 373                         netif_dbg(lp, rx_err, dev, "%s: rx fifo overrun\n",
 374                                   __func__);
 375                 }
 376                 if (status & SONIC_INT_RDE) {
 377                         netif_dbg(lp, rx_err, dev, "%s: rx descriptors exhausted\n",
 378                                   __func__);
 379                 }
 380                 if (status & SONIC_INT_RBAE) {
 381                         netif_dbg(lp, rx_err, dev, "%s: rx buffer area exceeded\n",
 382                                   __func__);
 383                 }
 384
 385                 /* counter overruns; all counters are 16bit wide */
 386                 if (status & SONIC_INT_FAE)
 387                         lp->stats.rx_frame_errors += 65536;
 388                 if (status & SONIC_INT_CRC)
 389                         lp->stats.rx_crc_errors += 65536;
 390                 if (status & SONIC_INT_MP)
 391                         lp->stats.rx_missed_errors += 65536;
 392
 393                 /* transmit error */
 394                 if (status & SONIC_INT_TXER)
 395                         if (SONIC_READ(SONIC_TCR) & SONIC_TCR_FU)
 396                                 netif_dbg(lp, tx_err, dev, "%s: tx fifo underrun\n",
 397                                           __func__);
 398
 399                 /* bus retry */
 400                 if (status & SONIC_INT_BR) {
 401                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
 402                                 dev->name);
 403                         /* ... to help debug DMA problems causing endless interrupts. */
 404                         /* Bounce the eth interface to turn on the interrupt again. */
 405                         SONIC_WRITE(SONIC_IMR, 0);
 406                 }
 407
 408                 status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT;
 409         } while (status);
 410
 411         spin_unlock_irqrestore(&lp->lock, flags);
 412
 413         return IRQ_HANDLED;
 414 }
 415
 416 /*
 417  * We have a good packet(s), pass it/them up the network stack.
 418  */
 419 static void sonic_rx(struct net_device *dev)
 420 {
 421         struct sonic_local *lp = netdev_priv(dev);
 422         int status;
 423         int entry = lp->cur_rx;
 424
 425         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
 426                 struct sk_buff *used_skb;
 427                 struct sk_buff *new_skb;
 428                 dma_addr_t new_laddr;
 429                 u16 bufadr_l;
 430                 u16 bufadr_h;
 431                 int pkt_len;
 432
 433                 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
 434                 if (status & SONIC_RCR_PRX) {
 435                         /* Malloc up new buffer. */
 436                         new_skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
 437                         if (new_skb == NULL) {
 438                                 lp->stats.rx_dropped++;
 439                                 break;
 440                         }
 441                         /* provide 16 byte IP header alignment unless DMA requires otherwise */
 442                         if(SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
 443                                 skb_reserve(new_skb, 2);
 444
 445                         new_laddr = dma_map_single(lp->device, skb_put(new_skb, SONIC_RBSIZE),
 446                                                SONIC_RBSIZE, DMA_FROM_DEVICE);
 447                         if (!new_laddr) {
 448                                 dev_kfree_skb(new_skb);
 449                                 printk(KERN_ERR "%s: Failed to map rx buffer, dropping packet.\n", dev->name);
 450                                 lp->stats.rx_dropped++;
 451                                 break;
 452                         }
 453
 454                         /* now we have a new skb to replace it, pass the used one up the stack */
 455                         dma_unmap_single(lp->device, lp->rx_laddr[entry], SONIC_RBSIZE, DMA_FROM_DEVICE);
 456                         used_skb = lp->rx_skb[entry];
 457                         pkt_len = sonic_rda_get(dev, entry, SONIC_RD_PKTLEN);
 458                         skb_trim(used_skb, pkt_len);
 459                         used_skb->protocol = eth_type_trans(used_skb, dev);
 460                         netif_rx(used_skb);
 461                         lp->stats.rx_packets++;
 462                         lp->stats.rx_bytes += pkt_len;
 463
 464                         /* and insert the new skb */
 465                         lp->rx_laddr[entry] = new_laddr;
 466                         lp->rx_skb[entry] = new_skb;
 467
 468                         bufadr_l = (unsigned long)new_laddr & 0xffff;
 469                         bufadr_h = (unsigned long)new_laddr >> 16;
 470                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, bufadr_l);
 471                         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, bufadr_h);
 472                 } else {
 473                         /* This should only happen, if we enable accepting broken packets. */
 474                 }
 475                 if (status & SONIC_RCR_LPKT) {
 476                         /*
 477                          * this was the last packet out of the current receive buffer
 478                          * give the buffer back to the SONIC
 479                          */
 480                         lp->cur_rwp += SIZEOF_SONIC_RR * SONIC_BUS_SCALE(lp->dma_bitmode);
 481                         if (lp->cur_rwp >= lp->rra_end) lp->cur_rwp = lp->rra_laddr & 0xffff;
 482                         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
 483                         if (SONIC_READ(SONIC_ISR) & SONIC_INT_RBE) {
 484                                 netif_dbg(lp, rx_err, dev, "%s: rx buffer exhausted\n",
 485                                           __func__);
 486                                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE); /* clear the flag */
 487                         }
 488                 } else
 489                         printk(KERN_ERR "%s: rx desc without RCR_LPKT. Shouldn't happen !?\n",
 490                              dev->name);
 491                 /*
 492                  * give back the descriptor
 493                  */
 494                 sonic_rda_put(dev, entry, SONIC_RD_LINK,
 495                         sonic_rda_get(dev, entry, SONIC_RD_LINK) | SONIC_EOL);
 496                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
 497                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK,
 498                         sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK) & ~SONIC_EOL);
 499                 lp->eol_rx = entry;
 500                 lp->cur_rx = entry = (entry + 1) & SONIC_RDS_MASK;
 501         }
 502         /*
 503          * If any worth-while packets have been received, netif_rx()
 504          * has done a mark_bh(NET_BH) for us and will work on them
 505          * when we get to the bottom-half routine.
 506          */
 507 }
 508
 509
 510 /*
 511  * Get the current statistics.
 512  * This may be called with the device open or closed.
 513  */
 514 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
 515 {
 516         struct sonic_local *lp = netdev_priv(dev);
 517
 518         /* read the tally counter from the SONIC and reset them */
 519         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
 520         SONIC_WRITE(SONIC_CRCT, 0xffff);
 521         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
 522         SONIC_WRITE(SONIC_FAET, 0xffff);
 523         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
 524         SONIC_WRITE(SONIC_MPT, 0xffff);
 525
 526         return &lp->stats;
 527 }
 528
 529
 530 /*
 531  * Set or clear the multicast filter for this adaptor.
 532  */
 533 static void sonic_multicast_list(struct net_device *dev)
 534 {
 535         struct sonic_local *lp = netdev_priv(dev);
 536         unsigned int rcr;
 537         struct netdev_hw_addr *ha;
 538         unsigned char *addr;
 539         int i;
 540
 541         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
 542         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
 543
 544         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
 545                 rcr |= SONIC_RCR_PRO;
 546         } else {
 547                 if ((dev->flags & IFF_ALLMULTI) ||
 548                     (netdev_mc_count(dev) > 15)) {
 549                         rcr |= SONIC_RCR_AMC;
 550                 } else {
 551                         netif_dbg(lp, ifup, dev, "%s: mc_count %d\n", __func__,
 552                                   netdev_mc_count(dev));
 553                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
 554                         i = 1;
 555                         netdev_for_each_mc_addr(ha, dev) {
 556                                 addr = ha->addr;
 557                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
 558                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
 559                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
 560                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
 561                                 i++;
 562                         }
 563                         SONIC_WRITE(SONIC_CDC, 16);
 564                         /* issue Load CAM command */
 565                         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 566                         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 567                 }
 568         }
 569
 570         netif_dbg(lp, ifup, dev, "%s: setting RCR=%x\n", __func__, rcr);
 571
 572         SONIC_WRITE(SONIC_RCR, rcr);
 573 }
 574
 575
 576 /*
 577  * Initialize the SONIC ethernet controller.
 578  */
 579 static int sonic_init(struct net_device *dev)
 580 {
 581         unsigned int cmd;
 582         struct sonic_local *lp = netdev_priv(dev);
 583         int i;
 584
 585         /*
 586          * put the Sonic into software-reset mode and
 587          * disable all interrupts
 588          */
 589         SONIC_WRITE(SONIC_IMR, 0);
 590         SONIC_WRITE(SONIC_ISR, 0x7fff);
 591         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 592
 593         /*
 594          * clear software reset flag, disable receiver, clear and
 595          * enable interrupts, then completely initialize the SONIC
 596          */
 597         SONIC_WRITE(SONIC_CMD, 0);
 598         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
 599
 600         /*
 601          * initialize the receive resource area
 602          */
 603         netif_dbg(lp, ifup, dev, "%s: initialize receive resource area\n",
 604                   __func__);
 605
 606         for (i = 0; i < SONIC_NUM_RRS; i++) {
 607                 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
 608                 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
 609                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
 610                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
 611                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
 612                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
 613         }
 614
 615         /* initialize all RRA registers */
 616         lp->rra_end = (lp->rra_laddr + SONIC_NUM_RRS * SIZEOF_SONIC_RR *
 617                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
 618         lp->cur_rwp = (lp->rra_laddr + (SONIC_NUM_RRS - 1) * SIZEOF_SONIC_RR *
 619                                         SONIC_BUS_SCALE(lp->dma_bitmode)) & 0xffff;
 620
 621         SONIC_WRITE(SONIC_RSA, lp->rra_laddr & 0xffff);
 622         SONIC_WRITE(SONIC_REA, lp->rra_end);
 623         SONIC_WRITE(SONIC_RRP, lp->rra_laddr & 0xffff);
 624         SONIC_WRITE(SONIC_RWP, lp->cur_rwp);
 625         SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
 626         SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
 627
 628         /* load the resource pointers */
 629         netif_dbg(lp, ifup, dev, "%s: issuing RRRA command\n", __func__);
 630
 631         SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
 632         i = 0;
 633         while (i++ < 100) {
 634                 if (SONIC_READ(SONIC_CMD) & SONIC_CR_RRRA)
 635                         break;
 636         }
 637
 638         netif_dbg(lp, ifup, dev, "%s: status=%x, i=%d\n", __func__,
 639                   SONIC_READ(SONIC_CMD), i);
 640
 641         /*
 642          * Initialize the receive descriptors so that they
 643          * become a circular linked list, ie. let the last
 644          * descriptor point to the first again.
 645          */
 646         netif_dbg(lp, ifup, dev, "%s: initialize receive descriptors\n",
 647                   __func__);
 648
 649         for (i=0; i<SONIC_NUM_RDS; i++) {
 650                 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
 651                 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
 652                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
 653                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
 654                 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
 655                 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
 656                 sonic_rda_put(dev, i, SONIC_RD_LINK,
 657                         lp->rda_laddr +
 658                         ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
 659         }
 660         /* fix last descriptor */
 661         sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
 662                 (lp->rda_laddr & 0xffff) | SONIC_EOL);
 663         lp->eol_rx = SONIC_NUM_RDS - 1;
 664         lp->cur_rx = 0;
 665         SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
 666         SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
 667
 668         /*
 669          * initialize transmit descriptors
 670          */
 671         netif_dbg(lp, ifup, dev, "%s: initialize transmit descriptors\n",
 672                   __func__);
 673
 674         for (i = 0; i < SONIC_NUM_TDS; i++) {
 675                 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
 676                 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
 677                 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
 678                 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
 679                 sonic_tda_put(dev, i, SONIC_TD_LINK,
 680                         (lp->tda_laddr & 0xffff) +
 681                         (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
 682                 lp->tx_skb[i] = NULL;
 683         }
 684         /* fix last descriptor */
 685         sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
 686                 (lp->tda_laddr & 0xffff));
 687
 688         SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
 689         SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
 690         lp->cur_tx = lp->next_tx = 0;
 691         lp->eol_tx = SONIC_NUM_TDS - 1;
 692
 693         /*
 694          * put our own address to CAM desc[0]
 695          */
 696         sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
 697         sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
 698         sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
 699         sonic_set_cam_enable(dev, 1);
 700
 701         for (i = 0; i < 16; i++)
 702                 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
 703
 704         /*
 705          * initialize CAM registers
 706          */
 707         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 708         SONIC_WRITE(SONIC_CDC, 16);
 709
 710         /*
 711          * load the CAM
 712          */
 713         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 714
 715         i = 0;
 716         while (i++ < 100) {
 717                 if (SONIC_READ(SONIC_ISR) & SONIC_INT_LCD)
 718                         break;
 719         }
 720         netif_dbg(lp, ifup, dev, "%s: CMD=%x, ISR=%x, i=%d\n", __func__,
 721                   SONIC_READ(SONIC_CMD), SONIC_READ(SONIC_ISR), i);
 722
 723         /*
 724          * enable receiver, disable loopback
 725          * and enable all interrupts
 726          */
 727         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN | SONIC_CR_STP);
 728         SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
 729         SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
 730         SONIC_WRITE(SONIC_ISR, 0x7fff);
 731         SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
 732
 733         cmd = SONIC_READ(SONIC_CMD);
 734         if ((cmd & SONIC_CR_RXEN) == 0 || (cmd & SONIC_CR_STP) == 0)
 735                 printk(KERN_ERR "sonic_init: failed, status=%x\n", cmd);
 736
 737         netif_dbg(lp, ifup, dev, "%s: new status=%x\n", __func__,
 738                   SONIC_READ(SONIC_CMD));
 739
 740         return 0;
 741 }
 742
 743 MODULE_LICENSE("GPL");