root/drivers/net/ethernet/natsemi/sonic.c

DEFINITIONS

1. sonic_msg_init
2. sonic_open
3. sonic_quiesce
4. sonic_close
5. sonic_tx_timeout
6. sonic_send_packet
7. sonic_interrupt
8. index_from_addr
9. sonic_alloc_rb
10. sonic_update_rra
11. sonic_rx
12. sonic_get_stats
13. sonic_multicast_list
14. sonic_init

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sonic.c
   4  *
   5  * (C) 2005 Finn Thain
   6  *
   7  * Converted to DMA API, added zero-copy buffer handling, and
   8  * (from the mac68k project) introduced dhd's support for 16-bit cards.
   9  *
  10  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  11  *
  12  * This driver is based on work from Andreas Busse, but most of
  13  * the code is rewritten.
  14  *
  15  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
  16  *
  17  *    Core code included by system sonic drivers
  18  *
  19  * And... partially rewritten again by David Huggins-Daines in order
  20  * to cope with screwed up Macintosh NICs that may or may not use
  21  * 16-bit DMA.
  22  *
  23  * (C) 1999 David Huggins-Daines <dhd@debian.org>
  24  *
  25  */
  26 
  27 /*
  28  * Sources: Olivetti M700-10 Risc Personal Computer hardware handbook,
  29  * National Semiconductors data sheet for the DP83932B Sonic Ethernet
  30  * controller, and the files "8390.c" and "skeleton.c" in this directory.
  31  *
  32  * Additional sources: Nat Semi data sheet for the DP83932C and Nat Semi
  33  * Application Note AN-746, the files "lance.c" and "ibmlana.c". See also
  34  * the NetBSD file "sys/arch/mac68k/dev/if_sn.c".
  35  */
  36 
  37 static unsigned int version_printed;
  38 
  39 static int sonic_debug = -1;
  40 module_param(sonic_debug, int, 0);
  41 MODULE_PARM_DESC(sonic_debug, "debug message level");
  42 
  43 static void sonic_msg_init(struct net_device *dev)
  44 {
  45         struct sonic_local *lp = netdev_priv(dev);
  46 
  47         lp->msg_enable = netif_msg_init(sonic_debug, 0);
  48 
  49         if (version_printed++ == 0)
  50                 netif_dbg(lp, drv, dev, "%s", version);
  51 }
  52 
  53 /*
  54  * Open/initialize the SONIC controller.
  55  *
  56  * This routine should set everything up anew at each open, even
  57  *  registers that "should" only need to be set once at boot, so that
  58  *  there is non-reboot way to recover if something goes wrong.
  59  */
  60 static int sonic_open(struct net_device *dev)
  61 {
  62         struct sonic_local *lp = netdev_priv(dev);
  63         int i;
  64 
  65         netif_dbg(lp, ifup, dev, "%s: initializing sonic driver\n", __func__);
  66 
  67         spin_lock_init(&lp->lock);
  68 
  69         for (i = 0; i < SONIC_NUM_RRS; i++) {
  70                 struct sk_buff *skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
  71                 if (skb == NULL) {
  72                         while(i > 0) { /* free any that were allocated successfully */
  73                                 i--;
  74                                 dev_kfree_skb(lp->rx_skb[i]);
  75                                 lp->rx_skb[i] = NULL;
  76                         }
  77                         printk(KERN_ERR "%s: couldn't allocate receive buffers\n",
  78                                dev->name);
  79                         return -ENOMEM;
  80                 }
  81                 /* align IP header unless DMA requires otherwise */
  82                 if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
  83                         skb_reserve(skb, 2);
  84                 lp->rx_skb[i] = skb;
  85         }
  86 
  87         for (i = 0; i < SONIC_NUM_RRS; i++) {
  88                 dma_addr_t laddr = dma_map_single(lp->device, skb_put(lp->rx_skb[i], SONIC_RBSIZE),
  89                                                   SONIC_RBSIZE, DMA_FROM_DEVICE);
  90                 if (dma_mapping_error(lp->device, laddr)) {
  91                         while(i > 0) { /* free any that were mapped successfully */
  92                                 i--;
  93                                 dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
  94                                 lp->rx_laddr[i] = (dma_addr_t)0;
  95                         }
  96                         for (i = 0; i < SONIC_NUM_RRS; i++) {
  97                                 dev_kfree_skb(lp->rx_skb[i]);
  98                                 lp->rx_skb[i] = NULL;
  99                         }
 100                         printk(KERN_ERR "%s: couldn't map rx DMA buffers\n",
 101                                dev->name);
 102                         return -ENOMEM;
 103                 }
 104                 lp->rx_laddr[i] = laddr;
 105         }
 106 
 107         /*
 108          * Initialize the SONIC
 109          */
 110         sonic_init(dev);
 111 
 112         netif_start_queue(dev);
 113 
 114         netif_dbg(lp, ifup, dev, "%s: Initialization done\n", __func__);
 115 
 116         return 0;
 117 }
 118 
 119 /* Wait for the SONIC to become idle. */
 120 static void sonic_quiesce(struct net_device *dev, u16 mask)
 121 {
 122         struct sonic_local * __maybe_unused lp = netdev_priv(dev);
 123         int i;
 124         u16 bits;
 125 
 126         for (i = 0; i < 1000; ++i) {
 127                 bits = SONIC_READ(SONIC_CMD) & mask;
 128                 if (!bits)
 129                         return;
 130                 if (irqs_disabled() || in_interrupt())
 131                         udelay(20);
 132                 else
 133                         usleep_range(100, 200);
 134         }
 135         WARN_ONCE(1, "command deadline expired! 0x%04x\n", bits);
 136 }
 137 
 138 /*
 139  * Close the SONIC device
 140  */
 141 static int sonic_close(struct net_device *dev)
 142 {
 143         struct sonic_local *lp = netdev_priv(dev);
 144         int i;
 145 
 146         netif_dbg(lp, ifdown, dev, "%s\n", __func__);
 147 
 148         netif_stop_queue(dev);
 149 
 150         /*
 151          * stop the SONIC, disable interrupts
 152          */
 153         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
 154         sonic_quiesce(dev, SONIC_CR_ALL);
 155 
 156         SONIC_WRITE(SONIC_IMR, 0);
 157         SONIC_WRITE(SONIC_ISR, 0x7fff);
 158         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 159 
 160         /* unmap and free skbs that haven't been transmitted */
 161         for (i = 0; i < SONIC_NUM_TDS; i++) {
 162                 if(lp->tx_laddr[i]) {
 163                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 164                         lp->tx_laddr[i] = (dma_addr_t)0;
 165                 }
 166                 if(lp->tx_skb[i]) {
 167                         dev_kfree_skb(lp->tx_skb[i]);
 168                         lp->tx_skb[i] = NULL;
 169                 }
 170         }
 171 
 172         /* unmap and free the receive buffers */
 173         for (i = 0; i < SONIC_NUM_RRS; i++) {
 174                 if(lp->rx_laddr[i]) {
 175                         dma_unmap_single(lp->device, lp->rx_laddr[i], SONIC_RBSIZE, DMA_FROM_DEVICE);
 176                         lp->rx_laddr[i] = (dma_addr_t)0;
 177                 }
 178                 if(lp->rx_skb[i]) {
 179                         dev_kfree_skb(lp->rx_skb[i]);
 180                         lp->rx_skb[i] = NULL;
 181                 }
 182         }
 183 
 184         return 0;
 185 }
 186 
 187 static void sonic_tx_timeout(struct net_device *dev)
 188 {
 189         struct sonic_local *lp = netdev_priv(dev);
 190         int i;
 191         /*
 192          * put the Sonic into software-reset mode and
 193          * disable all interrupts before releasing DMA buffers
 194          */
 195         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS);
 196         sonic_quiesce(dev, SONIC_CR_ALL);
 197 
 198         SONIC_WRITE(SONIC_IMR, 0);
 199         SONIC_WRITE(SONIC_ISR, 0x7fff);
 200         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 201         /* We could resend the original skbs. Easier to re-initialise. */
 202         for (i = 0; i < SONIC_NUM_TDS; i++) {
 203                 if(lp->tx_laddr[i]) {
 204                         dma_unmap_single(lp->device, lp->tx_laddr[i], lp->tx_len[i], DMA_TO_DEVICE);
 205                         lp->tx_laddr[i] = (dma_addr_t)0;
 206                 }
 207                 if(lp->tx_skb[i]) {
 208                         dev_kfree_skb(lp->tx_skb[i]);
 209                         lp->tx_skb[i] = NULL;
 210                 }
 211         }
 212         /* Try to restart the adaptor. */
 213         sonic_init(dev);
 214         lp->stats.tx_errors++;
 215         netif_trans_update(dev); /* prevent tx timeout */
 216         netif_wake_queue(dev);
 217 }
 218 
 219 /*
 220  * transmit packet
 221  *
 222  * Appends new TD during transmission thus avoiding any TX interrupts
 223  * until we run out of TDs.
 224  * This routine interacts closely with the ISR in that it may,
 225  *   set tx_skb[i]
 226  *   reset the status flags of the new TD
 227  *   set and reset EOL flags
 228  *   stop the tx queue
 229  * The ISR interacts with this routine in various ways. It may,
 230  *   reset tx_skb[i]
 231  *   test the EOL and status flags of the TDs
 232  *   wake the tx queue
 233  * Concurrently with all of this, the SONIC is potentially writing to
 234  * the status flags of the TDs.
 235  */
 236 
 237 static int sonic_send_packet(struct sk_buff *skb, struct net_device *dev)
 238 {
 239         struct sonic_local *lp = netdev_priv(dev);
 240         dma_addr_t laddr;
 241         int length;
 242         int entry;
 243         unsigned long flags;
 244 
 245         netif_dbg(lp, tx_queued, dev, "%s: skb=%p\n", __func__, skb);
 246 
 247         length = skb->len;
 248         if (length < ETH_ZLEN) {
 249                 if (skb_padto(skb, ETH_ZLEN))
 250                         return NETDEV_TX_OK;
 251                 length = ETH_ZLEN;
 252         }
 253 
 254         /*
 255          * Map the packet data into the logical DMA address space
 256          */
 257 
 258         laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
 259         if (!laddr) {
 260                 pr_err_ratelimited("%s: failed to map tx DMA buffer.\n", dev->name);
 261                 dev_kfree_skb_any(skb);
 262                 return NETDEV_TX_OK;
 263         }
 264 
 265         spin_lock_irqsave(&lp->lock, flags);
 266 
 267         entry = lp->next_tx;
 268 
 269         sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
 270         sonic_tda_put(dev, entry, SONIC_TD_FRAG_COUNT, 1);   /* single fragment */
 271         sonic_tda_put(dev, entry, SONIC_TD_PKTSIZE, length); /* length of packet */
 272         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_L, laddr & 0xffff);
 273         sonic_tda_put(dev, entry, SONIC_TD_FRAG_PTR_H, laddr >> 16);
 274         sonic_tda_put(dev, entry, SONIC_TD_FRAG_SIZE, length);
 275         sonic_tda_put(dev, entry, SONIC_TD_LINK,
 276                 sonic_tda_get(dev, entry, SONIC_TD_LINK) | SONIC_EOL);
 277 
 278         wmb();
 279         lp->tx_len[entry] = length;
 280         lp->tx_laddr[entry] = laddr;
 281         lp->tx_skb[entry] = skb;
 282 
 283         wmb();
 284         sonic_tda_put(dev, lp->eol_tx, SONIC_TD_LINK,
 285                                   sonic_tda_get(dev, lp->eol_tx, SONIC_TD_LINK) & ~SONIC_EOL);
 286         lp->eol_tx = entry;
 287 
 288         lp->next_tx = (entry + 1) & SONIC_TDS_MASK;
 289         if (lp->tx_skb[lp->next_tx] != NULL) {
 290                 /* The ring is full, the ISR has yet to process the next TD. */
 291                 netif_dbg(lp, tx_queued, dev, "%s: stopping queue\n", __func__);
 292                 netif_stop_queue(dev);
 293                 /* after this packet, wait for ISR to free up some TDAs */
 294         } else netif_start_queue(dev);
 295 
 296         netif_dbg(lp, tx_queued, dev, "%s: issuing Tx command\n", __func__);
 297 
 298         SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
 299 
 300         spin_unlock_irqrestore(&lp->lock, flags);
 301 
 302         return NETDEV_TX_OK;
 303 }
 304 
 305 /*
 306  * The typical workload of the driver:
 307  * Handle the network interface interrupts.
 308  */
 309 static irqreturn_t sonic_interrupt(int irq, void *dev_id)
 310 {
 311         struct net_device *dev = dev_id;
 312         struct sonic_local *lp = netdev_priv(dev);
 313         int status;
 314         unsigned long flags;
 315 
 316         /* The lock has two purposes. Firstly, it synchronizes sonic_interrupt()
 317          * with sonic_send_packet() so that the two functions can share state.
 318          * Secondly, it makes sonic_interrupt() re-entrant, as that is required
 319          * by macsonic which must use two IRQs with different priority levels.
 320          */
 321         spin_lock_irqsave(&lp->lock, flags);
 322 
 323         status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT;
 324         if (!status) {
 325                 spin_unlock_irqrestore(&lp->lock, flags);
 326 
 327                 return IRQ_NONE;
 328         }
 329 
 330         do {
 331                 SONIC_WRITE(SONIC_ISR, status); /* clear the interrupt(s) */
 332 
 333                 if (status & SONIC_INT_PKTRX) {
 334                         netif_dbg(lp, intr, dev, "%s: packet rx\n", __func__);
 335                         sonic_rx(dev);  /* got packet(s) */
 336                 }
 337 
 338                 if (status & SONIC_INT_TXDN) {
 339                         int entry = lp->cur_tx;
 340                         int td_status;
 341                         int freed_some = 0;
 342 
 343                         /* The state of a Transmit Descriptor may be inferred
 344                          * from { tx_skb[entry], td_status } as follows.
 345                          * { clear, clear } => the TD has never been used
 346                          * { set,   clear } => the TD was handed to SONIC
 347                          * { set,   set   } => the TD was handed back
 348                          * { clear, set   } => the TD is available for re-use
 349                          */
 350 
 351                         netif_dbg(lp, intr, dev, "%s: tx done\n", __func__);
 352 
 353                         while (lp->tx_skb[entry] != NULL) {
 354                                 if ((td_status = sonic_tda_get(dev, entry, SONIC_TD_STATUS)) == 0)
 355                                         break;
 356 
 357                                 if (td_status & SONIC_TCR_PTX) {
 358                                         lp->stats.tx_packets++;
 359                                         lp->stats.tx_bytes += sonic_tda_get(dev, entry, SONIC_TD_PKTSIZE);
 360                                 } else {
 361                                         if (td_status & (SONIC_TCR_EXD |
 362                                             SONIC_TCR_EXC | SONIC_TCR_BCM))
 363                                                 lp->stats.tx_aborted_errors++;
 364                                         if (td_status &
 365                                             (SONIC_TCR_NCRS | SONIC_TCR_CRLS))
 366                                                 lp->stats.tx_carrier_errors++;
 367                                         if (td_status & SONIC_TCR_OWC)
 368                                                 lp->stats.tx_window_errors++;
 369                                         if (td_status & SONIC_TCR_FU)
 370                                                 lp->stats.tx_fifo_errors++;
 371                                 }
 372 
 373                                 /* We must free the original skb */
 374                                 dev_consume_skb_irq(lp->tx_skb[entry]);
 375                                 lp->tx_skb[entry] = NULL;
 376                                 /* and unmap DMA buffer */
 377                                 dma_unmap_single(lp->device, lp->tx_laddr[entry], lp->tx_len[entry], DMA_TO_DEVICE);
 378                                 lp->tx_laddr[entry] = (dma_addr_t)0;
 379                                 freed_some = 1;
 380 
 381                                 if (sonic_tda_get(dev, entry, SONIC_TD_LINK) & SONIC_EOL) {
 382                                         entry = (entry + 1) & SONIC_TDS_MASK;
 383                                         break;
 384                                 }
 385                                 entry = (entry + 1) & SONIC_TDS_MASK;
 386                         }
 387 
 388                         if (freed_some || lp->tx_skb[entry] == NULL)
 389                                 netif_wake_queue(dev);  /* The ring is no longer full */
 390                         lp->cur_tx = entry;
 391                 }
 392 
 393                 /*
 394                  * check error conditions
 395                  */
 396                 if (status & SONIC_INT_RFO) {
 397                         netif_dbg(lp, rx_err, dev, "%s: rx fifo overrun\n",
 398                                   __func__);
 399                 }
 400                 if (status & SONIC_INT_RDE) {
 401                         netif_dbg(lp, rx_err, dev, "%s: rx descriptors exhausted\n",
 402                                   __func__);
 403                 }
 404                 if (status & SONIC_INT_RBAE) {
 405                         netif_dbg(lp, rx_err, dev, "%s: rx buffer area exceeded\n",
 406                                   __func__);
 407                 }
 408 
 409                 /* counter overruns; all counters are 16bit wide */
 410                 if (status & SONIC_INT_FAE)
 411                         lp->stats.rx_frame_errors += 65536;
 412                 if (status & SONIC_INT_CRC)
 413                         lp->stats.rx_crc_errors += 65536;
 414                 if (status & SONIC_INT_MP)
 415                         lp->stats.rx_missed_errors += 65536;
 416 
 417                 /* transmit error */
 418                 if (status & SONIC_INT_TXER) {
 419                         u16 tcr = SONIC_READ(SONIC_TCR);
 420 
 421                         netif_dbg(lp, tx_err, dev, "%s: TXER intr, TCR %04x\n",
 422                                   __func__, tcr);
 423 
 424                         if (tcr & (SONIC_TCR_EXD | SONIC_TCR_EXC |
 425                                    SONIC_TCR_FU | SONIC_TCR_BCM)) {
 426                                 /* Aborted transmission. Try again. */
 427                                 netif_stop_queue(dev);
 428                                 SONIC_WRITE(SONIC_CMD, SONIC_CR_TXP);
 429                         }
 430                 }
 431 
 432                 /* bus retry */
 433                 if (status & SONIC_INT_BR) {
 434                         printk(KERN_ERR "%s: Bus retry occurred! Device interrupt disabled.\n",
 435                                 dev->name);
 436                         /* ... to help debug DMA problems causing endless interrupts. */
 437                         /* Bounce the eth interface to turn on the interrupt again. */
 438                         SONIC_WRITE(SONIC_IMR, 0);
 439                 }
 440 
 441                 status = SONIC_READ(SONIC_ISR) & SONIC_IMR_DEFAULT;
 442         } while (status);
 443 
 444         spin_unlock_irqrestore(&lp->lock, flags);
 445 
 446         return IRQ_HANDLED;
 447 }
 448 
 449 /* Return the array index corresponding to a given Receive Buffer pointer. */
 450 static int index_from_addr(struct sonic_local *lp, dma_addr_t addr,
 451                            unsigned int last)
 452 {
 453         unsigned int i = last;
 454 
 455         do {
 456                 i = (i + 1) & SONIC_RRS_MASK;
 457                 if (addr == lp->rx_laddr[i])
 458                         return i;
 459         } while (i != last);
 460 
 461         return -ENOENT;
 462 }
 463 
 464 /* Allocate and map a new skb to be used as a receive buffer. */
 465 static bool sonic_alloc_rb(struct net_device *dev, struct sonic_local *lp,
 466                            struct sk_buff **new_skb, dma_addr_t *new_addr)
 467 {
 468         *new_skb = netdev_alloc_skb(dev, SONIC_RBSIZE + 2);
 469         if (!*new_skb)
 470                 return false;
 471 
 472         if (SONIC_BUS_SCALE(lp->dma_bitmode) == 2)
 473                 skb_reserve(*new_skb, 2);
 474 
 475         *new_addr = dma_map_single(lp->device, skb_put(*new_skb, SONIC_RBSIZE),
 476                                    SONIC_RBSIZE, DMA_FROM_DEVICE);
 477         if (!*new_addr) {
 478                 dev_kfree_skb(*new_skb);
 479                 *new_skb = NULL;
 480                 return false;
 481         }
 482 
 483         return true;
 484 }
 485 
 486 /* Place a new receive resource in the Receive Resource Area and update RWP. */
 487 static void sonic_update_rra(struct net_device *dev, struct sonic_local *lp,
 488                              dma_addr_t old_addr, dma_addr_t new_addr)
 489 {
 490         unsigned int entry = sonic_rr_entry(dev, SONIC_READ(SONIC_RWP));
 491         unsigned int end = sonic_rr_entry(dev, SONIC_READ(SONIC_RRP));
 492         u32 buf;
 493 
 494         /* The resources in the range [RRP, RWP) belong to the SONIC. This loop
 495          * scans the other resources in the RRA, those in the range [RWP, RRP).
 496          */
 497         do {
 498                 buf = (sonic_rra_get(dev, entry, SONIC_RR_BUFADR_H) << 16) |
 499                       sonic_rra_get(dev, entry, SONIC_RR_BUFADR_L);
 500 
 501                 if (buf == old_addr)
 502                         break;
 503 
 504                 entry = (entry + 1) & SONIC_RRS_MASK;
 505         } while (entry != end);
 506 
 507         WARN_ONCE(buf != old_addr, "failed to find resource!\n");
 508 
 509         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_H, new_addr >> 16);
 510         sonic_rra_put(dev, entry, SONIC_RR_BUFADR_L, new_addr & 0xffff);
 511 
 512         entry = (entry + 1) & SONIC_RRS_MASK;
 513 
 514         SONIC_WRITE(SONIC_RWP, sonic_rr_addr(dev, entry));
 515 }
 516 
 517 /*
 518  * We have a good packet(s), pass it/them up the network stack.
 519  */
 520 static void sonic_rx(struct net_device *dev)
 521 {
 522         struct sonic_local *lp = netdev_priv(dev);
 523         int entry = lp->cur_rx;
 524         int prev_entry = lp->eol_rx;
 525         bool rbe = false;
 526 
 527         while (sonic_rda_get(dev, entry, SONIC_RD_IN_USE) == 0) {
 528                 u16 status = sonic_rda_get(dev, entry, SONIC_RD_STATUS);
 529 
 530                 /* If the RD has LPKT set, the chip has finished with the RB */
 531                 if ((status & SONIC_RCR_PRX) && (status & SONIC_RCR_LPKT)) {
 532                         struct sk_buff *new_skb;
 533                         dma_addr_t new_laddr;
 534                         u32 addr = (sonic_rda_get(dev, entry,
 535                                                   SONIC_RD_PKTPTR_H) << 16) |
 536                                    sonic_rda_get(dev, entry, SONIC_RD_PKTPTR_L);
 537                         int i = index_from_addr(lp, addr, entry);
 538 
 539                         if (i < 0) {
 540                                 WARN_ONCE(1, "failed to find buffer!\n");
 541                                 break;
 542                         }
 543 
 544                         if (sonic_alloc_rb(dev, lp, &new_skb, &new_laddr)) {
 545                                 struct sk_buff *used_skb = lp->rx_skb[i];
 546                                 int pkt_len;
 547 
 548                                 /* Pass the used buffer up the stack */
 549                                 dma_unmap_single(lp->device, addr, SONIC_RBSIZE,
 550                                                  DMA_FROM_DEVICE);
 551 
 552                                 pkt_len = sonic_rda_get(dev, entry,
 553                                                         SONIC_RD_PKTLEN);
 554                                 skb_trim(used_skb, pkt_len);
 555                                 used_skb->protocol = eth_type_trans(used_skb,
 556                                                                     dev);
 557                                 netif_rx(used_skb);
 558                                 lp->stats.rx_packets++;
 559                                 lp->stats.rx_bytes += pkt_len;
 560 
 561                                 lp->rx_skb[i] = new_skb;
 562                                 lp->rx_laddr[i] = new_laddr;
 563                         } else {
 564                                 /* Failed to obtain a new buffer so re-use it */
 565                                 new_laddr = addr;
 566                                 lp->stats.rx_dropped++;
 567                         }
 568                         /* If RBE is already asserted when RWP advances then
 569                          * it's safe to clear RBE after processing this packet.
 570                          */
 571                         rbe = rbe || SONIC_READ(SONIC_ISR) & SONIC_INT_RBE;
 572                         sonic_update_rra(dev, lp, addr, new_laddr);
 573                 }
 574                 /*
 575                  * give back the descriptor
 576                  */
 577                 sonic_rda_put(dev, entry, SONIC_RD_STATUS, 0);
 578                 sonic_rda_put(dev, entry, SONIC_RD_IN_USE, 1);
 579 
 580                 prev_entry = entry;
 581                 entry = (entry + 1) & SONIC_RDS_MASK;
 582         }
 583 
 584         lp->cur_rx = entry;
 585 
 586         if (prev_entry != lp->eol_rx) {
 587                 /* Advance the EOL flag to put descriptors back into service */
 588                 sonic_rda_put(dev, prev_entry, SONIC_RD_LINK, SONIC_EOL |
 589                               sonic_rda_get(dev, prev_entry, SONIC_RD_LINK));
 590                 sonic_rda_put(dev, lp->eol_rx, SONIC_RD_LINK, ~SONIC_EOL &
 591                               sonic_rda_get(dev, lp->eol_rx, SONIC_RD_LINK));
 592                 lp->eol_rx = prev_entry;
 593         }
 594 
 595         if (rbe)
 596                 SONIC_WRITE(SONIC_ISR, SONIC_INT_RBE);
 597         /*
 598          * If any worth-while packets have been received, netif_rx()
 599          * has done a mark_bh(NET_BH) for us and will work on them
 600          * when we get to the bottom-half routine.
 601          */
 602 }
 603 
 604 
 605 /*
 606  * Get the current statistics.
 607  * This may be called with the device open or closed.
 608  */
 609 static struct net_device_stats *sonic_get_stats(struct net_device *dev)
 610 {
 611         struct sonic_local *lp = netdev_priv(dev);
 612 
 613         /* read the tally counter from the SONIC and reset them */
 614         lp->stats.rx_crc_errors += SONIC_READ(SONIC_CRCT);
 615         SONIC_WRITE(SONIC_CRCT, 0xffff);
 616         lp->stats.rx_frame_errors += SONIC_READ(SONIC_FAET);
 617         SONIC_WRITE(SONIC_FAET, 0xffff);
 618         lp->stats.rx_missed_errors += SONIC_READ(SONIC_MPT);
 619         SONIC_WRITE(SONIC_MPT, 0xffff);
 620 
 621         return &lp->stats;
 622 }
 623 
 624 
 625 /*
 626  * Set or clear the multicast filter for this adaptor.
 627  */
 628 static void sonic_multicast_list(struct net_device *dev)
 629 {
 630         struct sonic_local *lp = netdev_priv(dev);
 631         unsigned int rcr;
 632         struct netdev_hw_addr *ha;
 633         unsigned char *addr;
 634         int i;
 635 
 636         rcr = SONIC_READ(SONIC_RCR) & ~(SONIC_RCR_PRO | SONIC_RCR_AMC);
 637         rcr |= SONIC_RCR_BRD;   /* accept broadcast packets */
 638 
 639         if (dev->flags & IFF_PROMISC) { /* set promiscuous mode */
 640                 rcr |= SONIC_RCR_PRO;
 641         } else {
 642                 if ((dev->flags & IFF_ALLMULTI) ||
 643                     (netdev_mc_count(dev) > 15)) {
 644                         rcr |= SONIC_RCR_AMC;
 645                 } else {
 646                         unsigned long flags;
 647 
 648                         netif_dbg(lp, ifup, dev, "%s: mc_count %d\n", __func__,
 649                                   netdev_mc_count(dev));
 650                         sonic_set_cam_enable(dev, 1);  /* always enable our own address */
 651                         i = 1;
 652                         netdev_for_each_mc_addr(ha, dev) {
 653                                 addr = ha->addr;
 654                                 sonic_cda_put(dev, i, SONIC_CD_CAP0, addr[1] << 8 | addr[0]);
 655                                 sonic_cda_put(dev, i, SONIC_CD_CAP1, addr[3] << 8 | addr[2]);
 656                                 sonic_cda_put(dev, i, SONIC_CD_CAP2, addr[5] << 8 | addr[4]);
 657                                 sonic_set_cam_enable(dev, sonic_get_cam_enable(dev) | (1 << i));
 658                                 i++;
 659                         }
 660                         SONIC_WRITE(SONIC_CDC, 16);
 661                         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 662 
 663                         /* LCAM and TXP commands can't be used simultaneously */
 664                         spin_lock_irqsave(&lp->lock, flags);
 665                         sonic_quiesce(dev, SONIC_CR_TXP);
 666                         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 667                         sonic_quiesce(dev, SONIC_CR_LCAM);
 668                         spin_unlock_irqrestore(&lp->lock, flags);
 669                 }
 670         }
 671 
 672         netif_dbg(lp, ifup, dev, "%s: setting RCR=%x\n", __func__, rcr);
 673 
 674         SONIC_WRITE(SONIC_RCR, rcr);
 675 }
 676 
 677 
 678 /*
 679  * Initialize the SONIC ethernet controller.
 680  */
 681 static int sonic_init(struct net_device *dev)
 682 {
 683         struct sonic_local *lp = netdev_priv(dev);
 684         int i;
 685 
 686         /*
 687          * put the Sonic into software-reset mode and
 688          * disable all interrupts
 689          */
 690         SONIC_WRITE(SONIC_IMR, 0);
 691         SONIC_WRITE(SONIC_ISR, 0x7fff);
 692         SONIC_WRITE(SONIC_CMD, SONIC_CR_RST);
 693 
 694         /* While in reset mode, clear CAM Enable register */
 695         SONIC_WRITE(SONIC_CE, 0);
 696 
 697         /*
 698          * clear software reset flag, disable receiver, clear and
 699          * enable interrupts, then completely initialize the SONIC
 700          */
 701         SONIC_WRITE(SONIC_CMD, 0);
 702         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXDIS | SONIC_CR_STP);
 703         sonic_quiesce(dev, SONIC_CR_ALL);
 704 
 705         /*
 706          * initialize the receive resource area
 707          */
 708         netif_dbg(lp, ifup, dev, "%s: initialize receive resource area\n",
 709                   __func__);
 710 
 711         for (i = 0; i < SONIC_NUM_RRS; i++) {
 712                 u16 bufadr_l = (unsigned long)lp->rx_laddr[i] & 0xffff;
 713                 u16 bufadr_h = (unsigned long)lp->rx_laddr[i] >> 16;
 714                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_L, bufadr_l);
 715                 sonic_rra_put(dev, i, SONIC_RR_BUFADR_H, bufadr_h);
 716                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_L, SONIC_RBSIZE >> 1);
 717                 sonic_rra_put(dev, i, SONIC_RR_BUFSIZE_H, 0);
 718         }
 719 
 720         /* initialize all RRA registers */
 721         SONIC_WRITE(SONIC_RSA, sonic_rr_addr(dev, 0));
 722         SONIC_WRITE(SONIC_REA, sonic_rr_addr(dev, SONIC_NUM_RRS));
 723         SONIC_WRITE(SONIC_RRP, sonic_rr_addr(dev, 0));
 724         SONIC_WRITE(SONIC_RWP, sonic_rr_addr(dev, SONIC_NUM_RRS - 1));
 725         SONIC_WRITE(SONIC_URRA, lp->rra_laddr >> 16);
 726         SONIC_WRITE(SONIC_EOBC, (SONIC_RBSIZE >> 1) - (lp->dma_bitmode ? 2 : 1));
 727 
 728         /* load the resource pointers */
 729         netif_dbg(lp, ifup, dev, "%s: issuing RRRA command\n", __func__);
 730 
 731         SONIC_WRITE(SONIC_CMD, SONIC_CR_RRRA);
 732         sonic_quiesce(dev, SONIC_CR_RRRA);
 733 
 734         /*
 735          * Initialize the receive descriptors so that they
 736          * become a circular linked list, ie. let the last
 737          * descriptor point to the first again.
 738          */
 739         netif_dbg(lp, ifup, dev, "%s: initialize receive descriptors\n",
 740                   __func__);
 741 
 742         for (i=0; i<SONIC_NUM_RDS; i++) {
 743                 sonic_rda_put(dev, i, SONIC_RD_STATUS, 0);
 744                 sonic_rda_put(dev, i, SONIC_RD_PKTLEN, 0);
 745                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_L, 0);
 746                 sonic_rda_put(dev, i, SONIC_RD_PKTPTR_H, 0);
 747                 sonic_rda_put(dev, i, SONIC_RD_SEQNO, 0);
 748                 sonic_rda_put(dev, i, SONIC_RD_IN_USE, 1);
 749                 sonic_rda_put(dev, i, SONIC_RD_LINK,
 750                         lp->rda_laddr +
 751                         ((i+1) * SIZEOF_SONIC_RD * SONIC_BUS_SCALE(lp->dma_bitmode)));
 752         }
 753         /* fix last descriptor */
 754         sonic_rda_put(dev, SONIC_NUM_RDS - 1, SONIC_RD_LINK,
 755                 (lp->rda_laddr & 0xffff) | SONIC_EOL);
 756         lp->eol_rx = SONIC_NUM_RDS - 1;
 757         lp->cur_rx = 0;
 758         SONIC_WRITE(SONIC_URDA, lp->rda_laddr >> 16);
 759         SONIC_WRITE(SONIC_CRDA, lp->rda_laddr & 0xffff);
 760 
 761         /*
 762          * initialize transmit descriptors
 763          */
 764         netif_dbg(lp, ifup, dev, "%s: initialize transmit descriptors\n",
 765                   __func__);
 766 
 767         for (i = 0; i < SONIC_NUM_TDS; i++) {
 768                 sonic_tda_put(dev, i, SONIC_TD_STATUS, 0);
 769                 sonic_tda_put(dev, i, SONIC_TD_CONFIG, 0);
 770                 sonic_tda_put(dev, i, SONIC_TD_PKTSIZE, 0);
 771                 sonic_tda_put(dev, i, SONIC_TD_FRAG_COUNT, 0);
 772                 sonic_tda_put(dev, i, SONIC_TD_LINK,
 773                         (lp->tda_laddr & 0xffff) +
 774                         (i + 1) * SIZEOF_SONIC_TD * SONIC_BUS_SCALE(lp->dma_bitmode));
 775                 lp->tx_skb[i] = NULL;
 776         }
 777         /* fix last descriptor */
 778         sonic_tda_put(dev, SONIC_NUM_TDS - 1, SONIC_TD_LINK,
 779                 (lp->tda_laddr & 0xffff));
 780 
 781         SONIC_WRITE(SONIC_UTDA, lp->tda_laddr >> 16);
 782         SONIC_WRITE(SONIC_CTDA, lp->tda_laddr & 0xffff);
 783         lp->cur_tx = lp->next_tx = 0;
 784         lp->eol_tx = SONIC_NUM_TDS - 1;
 785 
 786         /*
 787          * put our own address to CAM desc[0]
 788          */
 789         sonic_cda_put(dev, 0, SONIC_CD_CAP0, dev->dev_addr[1] << 8 | dev->dev_addr[0]);
 790         sonic_cda_put(dev, 0, SONIC_CD_CAP1, dev->dev_addr[3] << 8 | dev->dev_addr[2]);
 791         sonic_cda_put(dev, 0, SONIC_CD_CAP2, dev->dev_addr[5] << 8 | dev->dev_addr[4]);
 792         sonic_set_cam_enable(dev, 1);
 793 
 794         for (i = 0; i < 16; i++)
 795                 sonic_cda_put(dev, i, SONIC_CD_ENTRY_POINTER, i);
 796 
 797         /*
 798          * initialize CAM registers
 799          */
 800         SONIC_WRITE(SONIC_CDP, lp->cda_laddr & 0xffff);
 801         SONIC_WRITE(SONIC_CDC, 16);
 802 
 803         /*
 804          * load the CAM
 805          */
 806         SONIC_WRITE(SONIC_CMD, SONIC_CR_LCAM);
 807         sonic_quiesce(dev, SONIC_CR_LCAM);
 808 
 809         /*
 810          * enable receiver, disable loopback
 811          * and enable all interrupts
 812          */
 813         SONIC_WRITE(SONIC_RCR, SONIC_RCR_DEFAULT);
 814         SONIC_WRITE(SONIC_TCR, SONIC_TCR_DEFAULT);
 815         SONIC_WRITE(SONIC_ISR, 0x7fff);
 816         SONIC_WRITE(SONIC_IMR, SONIC_IMR_DEFAULT);
 817         SONIC_WRITE(SONIC_CMD, SONIC_CR_RXEN);
 818 
 819         netif_dbg(lp, ifup, dev, "%s: new status=%x\n", __func__,
 820                   SONIC_READ(SONIC_CMD));
 821 
 822         return 0;
 823 }
 824 
 825 MODULE_LICENSE("GPL");