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