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