drivers/net/7990.c

   1 /*
   2  * 7990.c -- LANCE ethernet IC generic routines.
   3  * This is an attempt to separate out the bits of various ethernet
   4  * drivers that are common because they all use the AMD 7990 LANCE
   5  * (Local Area Network Controller for Ethernet) chip.
   6  *
   7  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
   8  *
   9  * Most of this stuff was obtained by looking at other LANCE drivers,
  10  * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
  11  * NB: this was made easy by the fact that Jes Sorensen had cleaned up
  12  * most of a2025 and sunlance with the aim of merging them, so the
  13  * common code was pretty obvious.
  14  */
  15 #include <linux/crc32.h>
  16 #include <linux/delay.h>
  17 #include <linux/errno.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/types.h>
  24 #include <linux/fcntl.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/ioport.h>
  27 #include <linux/in.h>
  28 #include <linux/route.h>
  29 #include <linux/slab.h>
  30 #include <linux/string.h>
  31 #include <linux/skbuff.h>
  32 #include <asm/irq.h>
  33 /* Used for the temporal inet entries and routing */
  34 #include <linux/socket.h>
  35 #include <linux/bitops.h>
  36
  37 #include <asm/system.h>
  38 #include <asm/io.h>
  39 #include <asm/dma.h>
  40 #include <asm/pgtable.h>
  41 #ifdef CONFIG_HP300
  42 #include <asm/blinken.h>
  43 #endif
  44
  45 #include "7990.h"
  46
  47 #define WRITERAP(lp,x) out_be16(lp->base + LANCE_RAP, (x))
  48 #define WRITERDP(lp,x) out_be16(lp->base + LANCE_RDP, (x))
  49 #define READRDP(lp) in_be16(lp->base + LANCE_RDP)
  50
  51 #if defined(CONFIG_HPLANCE) || defined(CONFIG_HPLANCE_MODULE)
  52 #include "hplance.h"
  53
  54 #undef WRITERAP
  55 #undef WRITERDP
  56 #undef READRDP
  57
  58 #if defined(CONFIG_MVME147_NET) || defined(CONFIG_MVME147_NET_MODULE)
  59
  60 /* Lossage Factor Nine, Mr Sulu. */
  61 #define WRITERAP(lp,x) (lp->writerap(lp,x))
  62 #define WRITERDP(lp,x) (lp->writerdp(lp,x))
  63 #define READRDP(lp) (lp->readrdp(lp))
  64
  65 #else
  66
  67 /* These inlines can be used if only CONFIG_HPLANCE is defined */
  68 static inline void WRITERAP(struct lance_private *lp, __u16 value)
  69 {
  70         do {
  71                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
  72         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
  73 }
  74
  75 static inline void WRITERDP(struct lance_private *lp, __u16 value)
  76 {
  77         do {
  78                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
  79         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
  80 }
  81
  82 static inline __u16 READRDP(struct lance_private *lp)
  83 {
  84         __u16 value;
  85         do {
  86                 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
  87         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
  88         return value;
  89 }
  90
  91 #endif
  92 #endif /* CONFIG_HPLANCE || CONFIG_HPLANCE_MODULE */
  93
  94 /* debugging output macros, various flavours */
  95 /* #define TEST_HITS */
  96 #ifdef UNDEF
  97 #define PRINT_RINGS() \
  98 do { \
  99         int t; \
 100         for (t=0; t < RX_RING_SIZE; t++) { \
 101                 printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n",\
 102                        t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,\
 103                        ib->brx_ring[t].length,\
 104                        ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);\
 105         }\
 106         for (t=0; t < TX_RING_SIZE; t++) { \
 107                 printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n",\
 108                        t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,\
 109                        ib->btx_ring[t].length,\
 110                        ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);\
 111         }\
 112 } while (0)
 113 #else
 114 #define PRINT_RINGS()
 115 #endif
 116
 117 /* Load the CSR registers. The LANCE has to be STOPped when we do this! */
 118 static void load_csrs (struct lance_private *lp)
 119 {
 120         volatile struct lance_init_block *aib = lp->lance_init_block;
 121         int leptr;
 122
 123         leptr = LANCE_ADDR (aib);
 124
 125         WRITERAP(lp, LE_CSR1);                    /* load address of init block */
 126         WRITERDP(lp, leptr & 0xFFFF);
 127         WRITERAP(lp, LE_CSR2);
 128         WRITERDP(lp, leptr >> 16);
 129         WRITERAP(lp, LE_CSR3);
 130         WRITERDP(lp, lp->busmaster_regval);       /* set byteswap/ALEctrl/byte ctrl */
 131
 132         /* Point back to csr0 */
 133         WRITERAP(lp, LE_CSR0);
 134 }
 135
 136 /* #define to 0 or 1 appropriately */
 137 #define DEBUG_IRING 0
 138 /* Set up the Lance Rx and Tx rings and the init block */
 139 static void lance_init_ring (struct net_device *dev)
 140 {
 141         struct lance_private *lp = netdev_priv(dev);
 142         volatile struct lance_init_block *ib = lp->init_block;
 143         volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
 144         int leptr;
 145         int i;
 146
 147         aib = lp->lance_init_block;
 148
 149         lp->rx_new = lp->tx_new = 0;
 150         lp->rx_old = lp->tx_old = 0;
 151
 152         ib->mode = LE_MO_PROM;                             /* normal, enable Tx & Rx */
 153
 154         /* Copy the ethernet address to the lance init block
 155          * Notice that we do a byteswap if we're big endian.
 156          * [I think this is the right criterion; at least, sunlance,
 157          * a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
 158          * However, the datasheet says that the BSWAP bit doesn't affect
 159          * the init block, so surely it should be low byte first for
 160          * everybody? Um.]
 161          * We could define the ib->physaddr as three 16bit values and
 162          * use (addr[1] << 8) | addr[0] & co, but this is more efficient.
 163          */
 164 #ifdef __BIG_ENDIAN
 165         ib->phys_addr [0] = dev->dev_addr [1];
 166         ib->phys_addr [1] = dev->dev_addr [0];
 167         ib->phys_addr [2] = dev->dev_addr [3];
 168         ib->phys_addr [3] = dev->dev_addr [2];
 169         ib->phys_addr [4] = dev->dev_addr [5];
 170         ib->phys_addr [5] = dev->dev_addr [4];
 171 #else
 172         for (i=0; i<6; i++)
 173            ib->phys_addr[i] = dev->dev_addr[i];
 174 #endif
 175
 176         if (DEBUG_IRING)
 177                 printk ("TX rings:\n");
 178
 179         lp->tx_full = 0;
 180         /* Setup the Tx ring entries */
 181         for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {
 182                 leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
 183                 ib->btx_ring [i].tmd0      = leptr;
 184                 ib->btx_ring [i].tmd1_hadr = leptr >> 16;
 185                 ib->btx_ring [i].tmd1_bits = 0;
 186                 ib->btx_ring [i].length    = 0xf000; /* The ones required by tmd2 */
 187                 ib->btx_ring [i].misc      = 0;
 188                 if (DEBUG_IRING)
 189                    printk ("%d: 0x%8.8x\n", i, leptr);
 190         }
 191
 192         /* Setup the Rx ring entries */
 193         if (DEBUG_IRING)
 194                 printk ("RX rings:\n");
 195         for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {
 196                 leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
 197
 198                 ib->brx_ring [i].rmd0      = leptr;
 199                 ib->brx_ring [i].rmd1_hadr = leptr >> 16;
 200                 ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
 201                 /* 0xf000 == bits that must be one (reserved, presumably) */
 202                 ib->brx_ring [i].length    = -RX_BUFF_SIZE | 0xf000;
 203                 ib->brx_ring [i].mblength  = 0;
 204                 if (DEBUG_IRING)
 205                         printk ("%d: 0x%8.8x\n", i, leptr);
 206         }
 207
 208         /* Setup the initialization block */
 209
 210         /* Setup rx descriptor pointer */
 211         leptr = LANCE_ADDR(&aib->brx_ring);
 212         ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
 213         ib->rx_ptr = leptr;
 214         if (DEBUG_IRING)
 215                 printk ("RX ptr: %8.8x\n", leptr);
 216
 217         /* Setup tx descriptor pointer */
 218         leptr = LANCE_ADDR(&aib->btx_ring);
 219         ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
 220         ib->tx_ptr = leptr;
 221         if (DEBUG_IRING)
 222                 printk ("TX ptr: %8.8x\n", leptr);
 223
 224         /* Clear the multicast filter */
 225         ib->filter [0] = 0;
 226         ib->filter [1] = 0;
 227         PRINT_RINGS();
 228 }
 229
 230 /* LANCE must be STOPped before we do this, too... */
 231 static int init_restart_lance (struct lance_private *lp)
 232 {
 233         int i;
 234
 235         WRITERAP(lp, LE_CSR0);
 236         WRITERDP(lp, LE_C0_INIT);
 237
 238         /* Need a hook here for sunlance ledma stuff */
 239
 240         /* Wait for the lance to complete initialization */
 241         for (i = 0; (i < 100) && !(READRDP(lp) & (LE_C0_ERR | LE_C0_IDON)); i++)
 242                 barrier();
 243         if ((i == 100) || (READRDP(lp) & LE_C0_ERR)) {
 244                 printk ("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP(lp));
 245                 return -1;
 246         }
 247
 248         /* Clear IDON by writing a "1", enable interrupts and start lance */
 249         WRITERDP(lp, LE_C0_IDON);
 250         WRITERDP(lp, LE_C0_INEA | LE_C0_STRT);
 251
 252         return 0;
 253 }
 254
 255 static int lance_reset (struct net_device *dev)
 256 {
 257         struct lance_private *lp = netdev_priv(dev);
 258         int status;
 259
 260         /* Stop the lance */
 261         WRITERAP(lp, LE_CSR0);
 262         WRITERDP(lp, LE_C0_STOP);
 263
 264         load_csrs (lp);
 265         lance_init_ring (dev);
 266         dev->trans_start = jiffies;
 267         status = init_restart_lance (lp);
 268 #ifdef DEBUG_DRIVER
 269         printk ("Lance restart=%d\n", status);
 270 #endif
 271         return status;
 272 }
 273
 274 static int lance_rx (struct net_device *dev)
 275 {
 276         struct lance_private *lp = netdev_priv(dev);
 277         volatile struct lance_init_block *ib = lp->init_block;
 278         volatile struct lance_rx_desc *rd;
 279         unsigned char bits;
 280 #ifdef TEST_HITS
 281         int i;
 282 #endif
 283
 284 #ifdef TEST_HITS
 285         printk ("[");
 286         for (i = 0; i < RX_RING_SIZE; i++) {
 287                 if (i == lp->rx_new)
 288                         printk ("%s",
 289                                 ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "_" : "X");
 290                 else
 291                         printk ("%s",
 292                                 ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "." : "1");
 293         }
 294         printk ("]");
 295 #endif
 296 #ifdef CONFIG_HP300
 297         blinken_leds(0x40, 0);
 298 #endif
 299         WRITERDP(lp, LE_C0_RINT | LE_C0_INEA);     /* ack Rx int, reenable ints */
 300         for (rd = &ib->brx_ring [lp->rx_new];     /* For each Rx ring we own... */
 301              !((bits = rd->rmd1_bits) & LE_R1_OWN);
 302              rd = &ib->brx_ring [lp->rx_new]) {
 303
 304                 /* We got an incomplete frame? */
 305                 if ((bits & LE_R1_POK) != LE_R1_POK) {
 306                         dev->stats.rx_over_errors++;
 307                         dev->stats.rx_errors++;
 308                         continue;
 309                 } else if (bits & LE_R1_ERR) {
 310                         /* Count only the end frame as a rx error,
 311                          * not the beginning
 312                          */
 313                         if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
 314                         if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
 315                         if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
 316                         if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
 317                         if (bits & LE_R1_EOP) dev->stats.rx_errors++;
 318                 } else {
 319                         int len = (rd->mblength & 0xfff) - 4;
 320                         struct sk_buff *skb = dev_alloc_skb (len+2);
 321
 322                         if (!skb) {
 323                                 printk ("%s: Memory squeeze, deferring packet.\n",
 324                                         dev->name);
 325                                 dev->stats.rx_dropped++;
 326                                 rd->mblength = 0;
 327                                 rd->rmd1_bits = LE_R1_OWN;
 328                                 lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
 329                                 return 0;
 330                         }
 331
 332                         skb_reserve (skb, 2);           /* 16 byte align */
 333                         skb_put (skb, len);             /* make room */
 334                         skb_copy_to_linear_data(skb,
 335                                          (unsigned char *)&(ib->rx_buf [lp->rx_new][0]),
 336                                          len);
 337                         skb->protocol = eth_type_trans (skb, dev);
 338                         netif_rx (skb);
 339                         dev->last_rx = jiffies;
 340                         dev->stats.rx_packets++;
 341                         dev->stats.rx_bytes += len;
 342                 }
 343
 344                 /* Return the packet to the pool */
 345                 rd->mblength = 0;
 346                 rd->rmd1_bits = LE_R1_OWN;
 347                 lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
 348         }
 349         return 0;
 350 }
 351
 352 static int lance_tx (struct net_device *dev)
 353 {
 354         struct lance_private *lp = netdev_priv(dev);
 355         volatile struct lance_init_block *ib = lp->init_block;
 356         volatile struct lance_tx_desc *td;
 357         int i, j;
 358         int status;
 359
 360 #ifdef CONFIG_HP300
 361         blinken_leds(0x80, 0);
 362 #endif
 363         /* csr0 is 2f3 */
 364         WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
 365         /* csr0 is 73 */
 366
 367         j = lp->tx_old;
 368         for (i = j; i != lp->tx_new; i = j) {
 369                 td = &ib->btx_ring [i];
 370
 371                 /* If we hit a packet not owned by us, stop */
 372                 if (td->tmd1_bits & LE_T1_OWN)
 373                         break;
 374
 375                 if (td->tmd1_bits & LE_T1_ERR) {
 376                         status = td->misc;
 377
 378                         dev->stats.tx_errors++;
 379                         if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
 380                         if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;
 381
 382                         if (status & LE_T3_CLOS) {
 383                                 dev->stats.tx_carrier_errors++;
 384                                 if (lp->auto_select) {
 385                                         lp->tpe = 1 - lp->tpe;
 386                                         printk("%s: Carrier Lost, trying %s\n",
 387                                                dev->name, lp->tpe?"TPE":"AUI");
 388                                         /* Stop the lance */
 389                                         WRITERAP(lp, LE_CSR0);
 390                                         WRITERDP(lp, LE_C0_STOP);
 391                                         lance_init_ring (dev);
 392                                         load_csrs (lp);
 393                                         init_restart_lance (lp);
 394                                         return 0;
 395                                 }
 396                         }
 397
 398                         /* buffer errors and underflows turn off the transmitter */
 399                         /* Restart the adapter */
 400                         if (status & (LE_T3_BUF|LE_T3_UFL)) {
 401                                 dev->stats.tx_fifo_errors++;
 402
 403                                 printk ("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
 404                                         dev->name);
 405                                 /* Stop the lance */
 406                                 WRITERAP(lp, LE_CSR0);
 407                                 WRITERDP(lp, LE_C0_STOP);
 408                                 lance_init_ring (dev);
 409                                 load_csrs (lp);
 410                                 init_restart_lance (lp);
 411                                 return 0;
 412                         }
 413                 } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
 414                         /*
 415                          * So we don't count the packet more than once.
 416                          */
 417                         td->tmd1_bits &= ~(LE_T1_POK);
 418
 419                         /* One collision before packet was sent. */
 420                         if (td->tmd1_bits & LE_T1_EONE)
 421                                 dev->stats.collisions++;
 422
 423                         /* More than one collision, be optimistic. */
 424                         if (td->tmd1_bits & LE_T1_EMORE)
 425                                 dev->stats.collisions += 2;
 426
 427                         dev->stats.tx_packets++;
 428                 }
 429
 430                 j = (j + 1) & lp->tx_ring_mod_mask;
 431         }
 432         lp->tx_old = j;
 433         WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
 434         return 0;
 435 }
 436
 437 static irqreturn_t
 438 lance_interrupt (int irq, void *dev_id)
 439 {
 440         struct net_device *dev = (struct net_device *)dev_id;
 441         struct lance_private *lp = netdev_priv(dev);
 442         int csr0;
 443
 444         spin_lock (&lp->devlock);
 445
 446         WRITERAP(lp, LE_CSR0);              /* LANCE Controller Status */
 447         csr0 = READRDP(lp);
 448
 449         PRINT_RINGS();
 450
 451         if (!(csr0 & LE_C0_INTR)) {     /* Check if any interrupt has */
 452                 spin_unlock (&lp->devlock);
 453                 return IRQ_NONE;        /* been generated by the Lance. */
 454         }
 455
 456         /* Acknowledge all the interrupt sources ASAP */
 457         WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
 458
 459         if ((csr0 & LE_C0_ERR)) {
 460                 /* Clear the error condition */
 461                 WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
 462         }
 463
 464         if (csr0 & LE_C0_RINT)
 465                 lance_rx (dev);
 466
 467         if (csr0 & LE_C0_TINT)
 468                 lance_tx (dev);
 469
 470         /* Log misc errors. */
 471         if (csr0 & LE_C0_BABL)
 472                 dev->stats.tx_errors++;       /* Tx babble. */
 473         if (csr0 & LE_C0_MISS)
 474                 dev->stats.rx_errors++;       /* Missed a Rx frame. */
 475         if (csr0 & LE_C0_MERR) {
 476                 printk("%s: Bus master arbitration failure, status %4.4x.\n",
 477                        dev->name, csr0);
 478                 /* Restart the chip. */
 479                 WRITERDP(lp, LE_C0_STRT);
 480         }
 481
 482         if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
 483                 lp->tx_full = 0;
 484                 netif_wake_queue (dev);
 485         }
 486
 487         WRITERAP(lp, LE_CSR0);
 488         WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
 489
 490         spin_unlock (&lp->devlock);
 491         return IRQ_HANDLED;
 492 }
 493
 494 int lance_open (struct net_device *dev)
 495 {
 496         struct lance_private *lp = netdev_priv(dev);
 497         int res;
 498
 499         /* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
 500         if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
 501                 return -EAGAIN;
 502
 503         res = lance_reset(dev);
 504         spin_lock_init(&lp->devlock);
 505         netif_start_queue (dev);
 506
 507         return res;
 508 }
 509 EXPORT_SYMBOL_GPL(lance_open);
 510
 511 int lance_close (struct net_device *dev)
 512 {
 513         struct lance_private *lp = netdev_priv(dev);
 514
 515         netif_stop_queue (dev);
 516
 517         /* Stop the LANCE */
 518         WRITERAP(lp, LE_CSR0);
 519         WRITERDP(lp, LE_C0_STOP);
 520
 521         free_irq(lp->irq, dev);
 522
 523         return 0;
 524 }
 525 EXPORT_SYMBOL_GPL(lance_close);
 526
 527 void lance_tx_timeout(struct net_device *dev)
 528 {
 529         printk("lance_tx_timeout\n");
 530         lance_reset(dev);
 531         dev->trans_start = jiffies;
 532         netif_wake_queue (dev);
 533 }
 534 EXPORT_SYMBOL_GPL(lance_tx_timeout);
 535
 536 int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
 537 {
 538         struct lance_private *lp = netdev_priv(dev);
 539         volatile struct lance_init_block *ib = lp->init_block;
 540         int entry, skblen, len;
 541         static int outs;
 542         unsigned long flags;
 543
 544         if (!TX_BUFFS_AVAIL)
 545                 return -1;
 546
 547         netif_stop_queue (dev);
 548
 549         skblen = skb->len;
 550
 551 #ifdef DEBUG_DRIVER
 552         /* dump the packet */
 553         {
 554                 int i;
 555
 556                 for (i = 0; i < 64; i++) {
 557                         if ((i % 16) == 0)
 558                                 printk ("\n");
 559                         printk ("%2.2x ", skb->data [i]);
 560                 }
 561         }
 562 #endif
 563         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 564         entry = lp->tx_new & lp->tx_ring_mod_mask;
 565         ib->btx_ring [entry].length = (-len) | 0xf000;
 566         ib->btx_ring [entry].misc = 0;
 567
 568         if (skb->len < ETH_ZLEN)
 569                 memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
 570         skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
 571
 572         /* Now, give the packet to the lance */
 573         ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
 574         lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
 575
 576         outs++;
 577         /* Kick the lance: transmit now */
 578         WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
 579         dev->trans_start = jiffies;
 580         dev_kfree_skb (skb);
 581
 582         spin_lock_irqsave (&lp->devlock, flags);
 583         if (TX_BUFFS_AVAIL)
 584                 netif_start_queue (dev);
 585         else
 586                 lp->tx_full = 1;
 587         spin_unlock_irqrestore (&lp->devlock, flags);
 588
 589         return 0;
 590 }
 591 EXPORT_SYMBOL_GPL(lance_start_xmit);
 592
 593 /* taken from the depca driver via a2065.c */
 594 static void lance_load_multicast (struct net_device *dev)
 595 {
 596         struct lance_private *lp = netdev_priv(dev);
 597         volatile struct lance_init_block *ib = lp->init_block;
 598         volatile u16 *mcast_table = (u16 *)&ib->filter;
 599         struct dev_mc_list *dmi=dev->mc_list;
 600         char *addrs;
 601         int i;
 602         u32 crc;
 603
 604         /* set all multicast bits */
 605         if (dev->flags & IFF_ALLMULTI){
 606                 ib->filter [0] = 0xffffffff;
 607                 ib->filter [1] = 0xffffffff;
 608                 return;
 609         }
 610         /* clear the multicast filter */
 611         ib->filter [0] = 0;
 612         ib->filter [1] = 0;
 613
 614         /* Add addresses */
 615         for (i = 0; i < dev->mc_count; i++){
 616                 addrs = dmi->dmi_addr;
 617                 dmi   = dmi->next;
 618
 619                 /* multicast address? */
 620                 if (!(*addrs & 1))
 621                         continue;
 622
 623                 crc = ether_crc_le(6, addrs);
 624                 crc = crc >> 26;
 625                 mcast_table [crc >> 4] |= 1 << (crc & 0xf);
 626         }
 627         return;
 628 }
 629
 630
 631 void lance_set_multicast (struct net_device *dev)
 632 {
 633         struct lance_private *lp = netdev_priv(dev);
 634         volatile struct lance_init_block *ib = lp->init_block;
 635         int stopped;
 636
 637         stopped = netif_queue_stopped(dev);
 638         if (!stopped)
 639                 netif_stop_queue (dev);
 640
 641         while (lp->tx_old != lp->tx_new)
 642                 schedule();
 643
 644         WRITERAP(lp, LE_CSR0);
 645         WRITERDP(lp, LE_C0_STOP);
 646         lance_init_ring (dev);
 647
 648         if (dev->flags & IFF_PROMISC) {
 649                 ib->mode |= LE_MO_PROM;
 650         } else {
 651                 ib->mode &= ~LE_MO_PROM;
 652                 lance_load_multicast (dev);
 653         }
 654         load_csrs (lp);
 655         init_restart_lance (lp);
 656
 657         if (!stopped)
 658                 netif_start_queue (dev);
 659 }
 660 EXPORT_SYMBOL_GPL(lance_set_multicast);
 661
 662 #ifdef CONFIG_NET_POLL_CONTROLLER
 663 void lance_poll(struct net_device *dev)
 664 {
 665         struct lance_private *lp = netdev_priv(dev);
 666
 667         spin_lock (&lp->devlock);
 668         WRITERAP(lp, LE_CSR0);
 669         WRITERDP(lp, LE_C0_STRT);
 670         spin_unlock (&lp->devlock);
 671         lance_interrupt(dev->irq, dev);
 672 }
 673 #endif
 674
 675 MODULE_LICENSE("GPL");