drivers/net/ethernet/amd/7990.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * 7990.c -- LANCE ethernet IC generic routines.
   4  * This is an attempt to separate out the bits of various ethernet
   5  * drivers that are common because they all use the AMD 7990 LANCE
   6  * (Local Area Network Controller for Ethernet) chip.
   7  *
   8  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
   9  *
  10  * Most of this stuff was obtained by looking at other LANCE drivers,
  11  * in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
  12  * NB: this was made easy by the fact that Jes Sorensen had cleaned up
  13  * most of a2025 and sunlance with the aim of merging them, so the
  14  * common code was pretty obvious.
  15  */
  16 #include <linux/crc32.h>
  17 #include <linux/delay.h>
  18 #include <linux/errno.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.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/string.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/pgtable.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/io.h>
  38 #include <asm/dma.h>
  39 #ifdef CONFIG_HP300
  40 #include <asm/blinken.h>
  41 #endif
  42
  43 #include "7990.h"
  44
  45 #define WRITERAP(lp, x) out_be16(lp->base + LANCE_RAP, (x))
  46 #define WRITERDP(lp, x) out_be16(lp->base + LANCE_RDP, (x))
  47 #define READRDP(lp)     in_be16(lp->base + LANCE_RDP)
  48
  49 #if IS_ENABLED(CONFIG_HPLANCE)
  50 #include "hplance.h"
  51
  52 #undef WRITERAP
  53 #undef WRITERDP
  54 #undef READRDP
  55
  56 #if IS_ENABLED(CONFIG_MVME147_NET)
  57
  58 /* Lossage Factor Nine, Mr Sulu. */
  59 #define WRITERAP(lp, x) (lp->writerap(lp, x))
  60 #define WRITERDP(lp, x) (lp->writerdp(lp, x))
  61 #define READRDP(lp)     (lp->readrdp(lp))
  62
  63 #else
  64
  65 /* These inlines can be used if only CONFIG_HPLANCE is defined */
  66 static inline void WRITERAP(struct lance_private *lp, __u16 value)
  67 {
  68         do {
  69                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
  70         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
  71 }
  72
  73 static inline void WRITERDP(struct lance_private *lp, __u16 value)
  74 {
  75         do {
  76                 out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
  77         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
  78 }
  79
  80 static inline __u16 READRDP(struct lance_private *lp)
  81 {
  82         __u16 value;
  83         do {
  84                 value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
  85         } while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
  86         return value;
  87 }
  88
  89 #endif
  90 #endif /* IS_ENABLED(CONFIG_HPLANCE) */
  91
  92 /* debugging output macros, various flavours */
  93 /* #define TEST_HITS */
  94 #ifdef UNDEF
  95 #define PRINT_RINGS() \
  96 do { \
  97         int t; \
  98         for (t = 0; t < RX_RING_SIZE; t++) { \
  99                 printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n", \
 100                        t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0, \
 101                        ib->brx_ring[t].length, \
 102                        ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits); \
 103         } \
 104         for (t = 0; t < TX_RING_SIZE; t++) { \
 105                 printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n", \
 106                        t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0, \
 107                        ib->btx_ring[t].length, \
 108                        ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits); \
 109         } \
 110 } while (0)
 111 #else
 112 #define PRINT_RINGS()
 113 #endif
 114
 115 /* Load the CSR registers. The LANCE has to be STOPped when we do this! */
 116 static void load_csrs(struct lance_private *lp)
 117 {
 118         volatile struct lance_init_block *aib = lp->lance_init_block;
 119         int leptr;
 120
 121         leptr = LANCE_ADDR(aib);
 122
 123         WRITERAP(lp, LE_CSR1);                    /* load address of init block */
 124         WRITERDP(lp, leptr & 0xFFFF);
 125         WRITERAP(lp, LE_CSR2);
 126         WRITERDP(lp, leptr >> 16);
 127         WRITERAP(lp, LE_CSR3);
 128         WRITERDP(lp, lp->busmaster_regval);       /* set byteswap/ALEctrl/byte ctrl */
 129
 130         /* Point back to csr0 */
 131         WRITERAP(lp, LE_CSR0);
 132 }
 133
 134 /* #define to 0 or 1 appropriately */
 135 #define DEBUG_IRING 0
 136 /* Set up the Lance Rx and Tx rings and the init block */
 137 static void lance_init_ring(struct net_device *dev)
 138 {
 139         struct lance_private *lp = netdev_priv(dev);
 140         volatile struct lance_init_block *ib = lp->init_block;
 141         volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
 142         int leptr;
 143         int i;
 144
 145         aib = lp->lance_init_block;
 146
 147         lp->rx_new = lp->tx_new = 0;
 148         lp->rx_old = lp->tx_old = 0;
 149
 150         ib->mode = LE_MO_PROM;                             /* normal, enable Tx & Rx */
 151
 152         /* Copy the ethernet address to the lance init block
 153          * Notice that we do a byteswap if we're big endian.
 154          * [I think this is the right criterion; at least, sunlance,
 155          * a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
 156          * However, the datasheet says that the BSWAP bit doesn't affect
 157          * the init block, so surely it should be low byte first for
 158          * everybody? Um.]
 159          * We could define the ib->physaddr as three 16bit values and
 160          * use (addr[1] << 8) | addr[0] & co, but this is more efficient.
 161          */
 162 #ifdef __BIG_ENDIAN
 163         ib->phys_addr[0] = dev->dev_addr[1];
 164         ib->phys_addr[1] = dev->dev_addr[0];
 165         ib->phys_addr[2] = dev->dev_addr[3];
 166         ib->phys_addr[3] = dev->dev_addr[2];
 167         ib->phys_addr[4] = dev->dev_addr[5];
 168         ib->phys_addr[5] = dev->dev_addr[4];
 169 #else
 170         for (i = 0; i < 6; i++)
 171                ib->phys_addr[i] = dev->dev_addr[i];
 172 #endif
 173
 174         if (DEBUG_IRING)
 175                 printk("TX rings:\n");
 176
 177         lp->tx_full = 0;
 178         /* Setup the Tx ring entries */
 179         for (i = 0; i < (1 << lp->lance_log_tx_bufs); i++) {
 180                 leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
 181                 ib->btx_ring[i].tmd0      = leptr;
 182                 ib->btx_ring[i].tmd1_hadr = leptr >> 16;
 183                 ib->btx_ring[i].tmd1_bits = 0;
 184                 ib->btx_ring[i].length    = 0xf000; /* The ones required by tmd2 */
 185                 ib->btx_ring[i].misc      = 0;
 186                 if (DEBUG_IRING)
 187                         printk("%d: 0x%8.8x\n", i, leptr);
 188         }
 189
 190         /* Setup the Rx ring entries */
 191         if (DEBUG_IRING)
 192                 printk("RX rings:\n");
 193         for (i = 0; i < (1 << lp->lance_log_rx_bufs); i++) {
 194                 leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
 195
 196                 ib->brx_ring[i].rmd0      = leptr;
 197                 ib->brx_ring[i].rmd1_hadr = leptr >> 16;
 198                 ib->brx_ring[i].rmd1_bits = LE_R1_OWN;
 199                 /* 0xf000 == bits that must be one (reserved, presumably) */
 200                 ib->brx_ring[i].length    = -RX_BUFF_SIZE | 0xf000;
 201                 ib->brx_ring[i].mblength  = 0;
 202                 if (DEBUG_IRING)
 203                         printk("%d: 0x%8.8x\n", i, leptr);
 204         }
 205
 206         /* Setup the initialization block */
 207
 208         /* Setup rx descriptor pointer */
 209         leptr = LANCE_ADDR(&aib->brx_ring);
 210         ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
 211         ib->rx_ptr = leptr;
 212         if (DEBUG_IRING)
 213                 printk("RX ptr: %8.8x\n", leptr);
 214
 215         /* Setup tx descriptor pointer */
 216         leptr = LANCE_ADDR(&aib->btx_ring);
 217         ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
 218         ib->tx_ptr = leptr;
 219         if (DEBUG_IRING)
 220                 printk("TX ptr: %8.8x\n", leptr);
 221
 222         /* Clear the multicast filter */
 223         ib->filter[0] = 0;
 224         ib->filter[1] = 0;
 225         PRINT_RINGS();
 226 }
 227
 228 /* LANCE must be STOPped before we do this, too... */
 229 static int init_restart_lance(struct lance_private *lp)
 230 {
 231         int i;
 232
 233         WRITERAP(lp, LE_CSR0);
 234         WRITERDP(lp, LE_C0_INIT);
 235
 236         /* Need a hook here for sunlance ledma stuff */
 237
 238         /* Wait for the lance to complete initialization */
 239         for (i = 0; (i < 100) && !(READRDP(lp) & (LE_C0_ERR | LE_C0_IDON)); i++)
 240                 barrier();
 241         if ((i == 100) || (READRDP(lp) & LE_C0_ERR)) {
 242                 printk("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP(lp));
 243                 return -1;
 244         }
 245
 246         /* Clear IDON by writing a "1", enable interrupts and start lance */
 247         WRITERDP(lp, LE_C0_IDON);
 248         WRITERDP(lp, LE_C0_INEA | LE_C0_STRT);
 249
 250         return 0;
 251 }
 252
 253 static int lance_reset(struct net_device *dev)
 254 {
 255         struct lance_private *lp = netdev_priv(dev);
 256         int status;
 257
 258         /* Stop the lance */
 259         WRITERAP(lp, LE_CSR0);
 260         WRITERDP(lp, LE_C0_STOP);
 261
 262         load_csrs(lp);
 263         lance_init_ring(dev);
 264         netif_trans_update(dev); /* prevent tx timeout */
 265         status = init_restart_lance(lp);
 266 #ifdef DEBUG_DRIVER
 267         printk("Lance restart=%d\n", status);
 268 #endif
 269         return status;
 270 }
 271
 272 static int lance_rx(struct net_device *dev)
 273 {
 274         struct lance_private *lp = netdev_priv(dev);
 275         volatile struct lance_init_block *ib = lp->init_block;
 276         volatile struct lance_rx_desc *rd;
 277         unsigned char bits;
 278 #ifdef TEST_HITS
 279         int i;
 280 #endif
 281
 282 #ifdef TEST_HITS
 283         printk("[");
 284         for (i = 0; i < RX_RING_SIZE; i++) {
 285                 if (i == lp->rx_new)
 286                         printk("%s",
 287                                ib->brx_ring[i].rmd1_bits & LE_R1_OWN ? "_" : "X");
 288                 else
 289                         printk("%s",
 290                               ib->brx_ring[i].rmd1_bits & LE_R1_OWN ? "." : "1");
 291         }
 292         printk("]");
 293 #endif
 294 #ifdef CONFIG_HP300
 295         blinken_leds(0x40, 0);
 296 #endif
 297         WRITERDP(lp, LE_C0_RINT | LE_C0_INEA);     /* ack Rx int, reenable ints */
 298         for (rd = &ib->brx_ring[lp->rx_new];     /* For each Rx ring we own... */
 299              !((bits = rd->rmd1_bits) & LE_R1_OWN);
 300              rd = &ib->brx_ring[lp->rx_new]) {
 301
 302                 /* We got an incomplete frame? */
 303                 if ((bits & LE_R1_POK) != LE_R1_POK) {
 304                         dev->stats.rx_over_errors++;
 305                         dev->stats.rx_errors++;
 306                         continue;
 307                 } else if (bits & LE_R1_ERR) {
 308                         /* Count only the end frame as a rx error,
 309                          * not the beginning
 310                          */
 311                         if (bits & LE_R1_BUF)
 312                                 dev->stats.rx_fifo_errors++;
 313                         if (bits & LE_R1_CRC)
 314                                 dev->stats.rx_crc_errors++;
 315                         if (bits & LE_R1_OFL)
 316                                 dev->stats.rx_over_errors++;
 317                         if (bits & LE_R1_FRA)
 318                                 dev->stats.rx_frame_errors++;
 319                         if (bits & LE_R1_EOP)
 320                                 dev->stats.rx_errors++;
 321                 } else {
 322                         int len = (rd->mblength & 0xfff) - 4;
 323                         struct sk_buff *skb = netdev_alloc_skb(dev, len + 2);
 324
 325                         if (!skb) {
 326                                 dev->stats.rx_dropped++;
 327                                 rd->mblength = 0;
 328                                 rd->rmd1_bits = LE_R1_OWN;
 329                                 lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
 330                                 return 0;
 331                         }
 332
 333                         skb_reserve(skb, 2);           /* 16 byte align */
 334                         skb_put(skb, len);             /* make room */
 335                         skb_copy_to_linear_data(skb,
 336                                          (unsigned char *)&(ib->rx_buf[lp->rx_new][0]),
 337                                          len);
 338                         skb->protocol = eth_type_trans(skb, dev);
 339                         netif_rx(skb);
 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)
 380                                 dev->stats.tx_aborted_errors++;
 381                         if (status & LE_T3_LCOL)
 382                                 dev->stats.tx_window_errors++;
 383
 384                         if (status & LE_T3_CLOS) {
 385                                 dev->stats.tx_carrier_errors++;
 386                                 if (lp->auto_select) {
 387                                         lp->tpe = 1 - lp->tpe;
 388                                         printk("%s: Carrier Lost, trying %s\n",
 389                                                dev->name,
 390                                                lp->tpe ? "TPE" : "AUI");
 391                                         /* Stop the lance */
 392                                         WRITERAP(lp, LE_CSR0);
 393                                         WRITERDP(lp, LE_C0_STOP);
 394                                         lance_init_ring(dev);
 395                                         load_csrs(lp);
 396                                         init_restart_lance(lp);
 397                                         return 0;
 398                                 }
 399                         }
 400
 401                         /* buffer errors and underflows turn off the transmitter */
 402                         /* Restart the adapter */
 403                         if (status & (LE_T3_BUF|LE_T3_UFL)) {
 404                                 dev->stats.tx_fifo_errors++;
 405
 406                                 printk("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
 407                                        dev->name);
 408                                 /* Stop the lance */
 409                                 WRITERAP(lp, LE_CSR0);
 410                                 WRITERDP(lp, LE_C0_STOP);
 411                                 lance_init_ring(dev);
 412                                 load_csrs(lp);
 413                                 init_restart_lance(lp);
 414                                 return 0;
 415                         }
 416                 } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
 417                         /*
 418                          * So we don't count the packet more than once.
 419                          */
 420                         td->tmd1_bits &= ~(LE_T1_POK);
 421
 422                         /* One collision before packet was sent. */
 423                         if (td->tmd1_bits & LE_T1_EONE)
 424                                 dev->stats.collisions++;
 425
 426                         /* More than one collision, be optimistic. */
 427                         if (td->tmd1_bits & LE_T1_EMORE)
 428                                 dev->stats.collisions += 2;
 429
 430                         dev->stats.tx_packets++;
 431                 }
 432
 433                 j = (j + 1) & lp->tx_ring_mod_mask;
 434         }
 435         lp->tx_old = j;
 436         WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
 437         return 0;
 438 }
 439
 440 static irqreturn_t
 441 lance_interrupt(int irq, void *dev_id)
 442 {
 443         struct net_device *dev = (struct net_device *)dev_id;
 444         struct lance_private *lp = netdev_priv(dev);
 445         int csr0;
 446
 447         spin_lock(&lp->devlock);
 448
 449         WRITERAP(lp, LE_CSR0);              /* LANCE Controller Status */
 450         csr0 = READRDP(lp);
 451
 452         PRINT_RINGS();
 453
 454         if (!(csr0 & LE_C0_INTR)) {     /* Check if any interrupt has */
 455                 spin_unlock(&lp->devlock);
 456                 return IRQ_NONE;        /* been generated by the Lance. */
 457         }
 458
 459         /* Acknowledge all the interrupt sources ASAP */
 460         WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
 461
 462         if ((csr0 & LE_C0_ERR)) {
 463                 /* Clear the error condition */
 464                 WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
 465         }
 466
 467         if (csr0 & LE_C0_RINT)
 468                 lance_rx(dev);
 469
 470         if (csr0 & LE_C0_TINT)
 471                 lance_tx(dev);
 472
 473         /* Log misc errors. */
 474         if (csr0 & LE_C0_BABL)
 475                 dev->stats.tx_errors++;       /* Tx babble. */
 476         if (csr0 & LE_C0_MISS)
 477                 dev->stats.rx_errors++;       /* Missed a Rx frame. */
 478         if (csr0 & LE_C0_MERR) {
 479                 printk("%s: Bus master arbitration failure, status %4.4x.\n",
 480                        dev->name, csr0);
 481                 /* Restart the chip. */
 482                 WRITERDP(lp, LE_C0_STRT);
 483         }
 484
 485         if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
 486                 lp->tx_full = 0;
 487                 netif_wake_queue(dev);
 488         }
 489
 490         WRITERAP(lp, LE_CSR0);
 491         WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
 492
 493         spin_unlock(&lp->devlock);
 494         return IRQ_HANDLED;
 495 }
 496
 497 int lance_open(struct net_device *dev)
 498 {
 499         struct lance_private *lp = netdev_priv(dev);
 500         int res;
 501
 502         /* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
 503         if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
 504                 return -EAGAIN;
 505
 506         res = lance_reset(dev);
 507         spin_lock_init(&lp->devlock);
 508         netif_start_queue(dev);
 509
 510         return res;
 511 }
 512 EXPORT_SYMBOL_GPL(lance_open);
 513
 514 int lance_close(struct net_device *dev)
 515 {
 516         struct lance_private *lp = netdev_priv(dev);
 517
 518         netif_stop_queue(dev);
 519
 520         /* Stop the LANCE */
 521         WRITERAP(lp, LE_CSR0);
 522         WRITERDP(lp, LE_C0_STOP);
 523
 524         free_irq(lp->irq, dev);
 525
 526         return 0;
 527 }
 528 EXPORT_SYMBOL_GPL(lance_close);
 529
 530 void lance_tx_timeout(struct net_device *dev, unsigned int txqueue)
 531 {
 532         printk("lance_tx_timeout\n");
 533         lance_reset(dev);
 534         netif_trans_update(dev); /* prevent tx timeout */
 535         netif_wake_queue(dev);
 536 }
 537 EXPORT_SYMBOL_GPL(lance_tx_timeout);
 538
 539 netdev_tx_t lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
 540 {
 541         struct lance_private *lp = netdev_priv(dev);
 542         volatile struct lance_init_block *ib = lp->init_block;
 543         int entry, skblen, len;
 544         static int outs;
 545         unsigned long flags;
 546
 547         netif_stop_queue(dev);
 548
 549         if (!TX_BUFFS_AVAIL) {
 550                 dev_consume_skb_any(skb);
 551                 return NETDEV_TX_OK;
 552         }
 553
 554         skblen = skb->len;
 555
 556 #ifdef DEBUG_DRIVER
 557         /* dump the packet */
 558         {
 559                 int i;
 560
 561                 for (i = 0; i < 64; i++) {
 562                         if ((i % 16) == 0)
 563                                 printk("\n");
 564                         printk("%2.2x ", skb->data[i]);
 565                 }
 566         }
 567 #endif
 568         len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 569         entry = lp->tx_new & lp->tx_ring_mod_mask;
 570         ib->btx_ring[entry].length = (-len) | 0xf000;
 571         ib->btx_ring[entry].misc = 0;
 572
 573         if (skb->len < ETH_ZLEN)
 574                 memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
 575         skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
 576
 577         /* Now, give the packet to the lance */
 578         ib->btx_ring[entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
 579         lp->tx_new = (lp->tx_new + 1) & lp->tx_ring_mod_mask;
 580
 581         outs++;
 582         /* Kick the lance: transmit now */
 583         WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
 584         dev_consume_skb_any(skb);
 585
 586         spin_lock_irqsave(&lp->devlock, flags);
 587         if (TX_BUFFS_AVAIL)
 588                 netif_start_queue(dev);
 589         else
 590                 lp->tx_full = 1;
 591         spin_unlock_irqrestore(&lp->devlock, flags);
 592
 593         return NETDEV_TX_OK;
 594 }
 595 EXPORT_SYMBOL_GPL(lance_start_xmit);
 596
 597 /* taken from the depca driver via a2065.c */
 598 static void lance_load_multicast(struct net_device *dev)
 599 {
 600         struct lance_private *lp = netdev_priv(dev);
 601         volatile struct lance_init_block *ib = lp->init_block;
 602         volatile u16 *mcast_table = (u16 *)&ib->filter;
 603         struct netdev_hw_addr *ha;
 604         u32 crc;
 605
 606         /* set all multicast bits */
 607         if (dev->flags & IFF_ALLMULTI) {
 608                 ib->filter[0] = 0xffffffff;
 609                 ib->filter[1] = 0xffffffff;
 610                 return;
 611         }
 612         /* clear the multicast filter */
 613         ib->filter[0] = 0;
 614         ib->filter[1] = 0;
 615
 616         /* Add addresses */
 617         netdev_for_each_mc_addr(ha, dev) {
 618                 crc = ether_crc_le(6, ha->addr);
 619                 crc = crc >> 26;
 620                 mcast_table[crc >> 4] |= 1 << (crc & 0xf);
 621         }
 622 }
 623
 624
 625 void lance_set_multicast(struct net_device *dev)
 626 {
 627         struct lance_private *lp = netdev_priv(dev);
 628         volatile struct lance_init_block *ib = lp->init_block;
 629         int stopped;
 630
 631         stopped = netif_queue_stopped(dev);
 632         if (!stopped)
 633                 netif_stop_queue(dev);
 634
 635         while (lp->tx_old != lp->tx_new)
 636                 schedule();
 637
 638         WRITERAP(lp, LE_CSR0);
 639         WRITERDP(lp, LE_C0_STOP);
 640         lance_init_ring(dev);
 641
 642         if (dev->flags & IFF_PROMISC) {
 643                 ib->mode |= LE_MO_PROM;
 644         } else {
 645                 ib->mode &= ~LE_MO_PROM;
 646                 lance_load_multicast(dev);
 647         }
 648         load_csrs(lp);
 649         init_restart_lance(lp);
 650
 651         if (!stopped)
 652                 netif_start_queue(dev);
 653 }
 654 EXPORT_SYMBOL_GPL(lance_set_multicast);
 655
 656 #ifdef CONFIG_NET_POLL_CONTROLLER
 657 void lance_poll(struct net_device *dev)
 658 {
 659         struct lance_private *lp = netdev_priv(dev);
 660
 661         spin_lock(&lp->devlock);
 662         WRITERAP(lp, LE_CSR0);
 663         WRITERDP(lp, LE_C0_STRT);
 664         spin_unlock(&lp->devlock);
 665         lance_interrupt(dev->irq, dev);
 666 }
 667 EXPORT_SYMBOL_GPL(lance_poll);
 668 #endif
 669
 670 MODULE_LICENSE("GPL");