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