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