LXR linux/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 */
  68static 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
  75static 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
  82static 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() \
  98do { \
  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! */
 118static 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 */
 139static 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... */
 231static 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
 255static 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
 274static 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->stats.rx_packets++;
 340                        dev->stats.rx_bytes += len;
 341                }
 342
 343                /* Return the packet to the pool */
 344                rd->mblength = 0;
 345                rd->rmd1_bits = LE_R1_OWN;
 346                lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
 347        }
 348        return 0;
 349}
 350
 351static int lance_tx (struct net_device *dev)
 352{
 353        struct lance_private *lp = netdev_priv(dev);
 354        volatile struct lance_init_block *ib = lp->init_block;
 355        volatile struct lance_tx_desc *td;
 356        int i, j;
 357        int status;
 358
 359#ifdef CONFIG_HP300
 360        blinken_leds(0x80, 0);
 361#endif
 362        /* csr0 is 2f3 */
 363        WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
 364        /* csr0 is 73 */
 365
 366        j = lp->tx_old;
 367        for (i = j; i != lp->tx_new; i = j) {
 368                td = &ib->btx_ring [i];
 369
 370                /* If we hit a packet not owned by us, stop */
 371                if (td->tmd1_bits & LE_T1_OWN)
 372                        break;
 373
 374                if (td->tmd1_bits & LE_T1_ERR) {
 375                        status = td->misc;
 376
 377                        dev->stats.tx_errors++;
 378                        if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
 379                        if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;
 380
 381                        if (status & LE_T3_CLOS) {
 382                                dev->stats.tx_carrier_errors++;
 383                                if (lp->auto_select) {
 384                                        lp->tpe = 1 - lp->tpe;
 385                                        printk("%s: Carrier Lost, trying %s\n",
 386                                               dev->name, lp->tpe?"TPE":"AUI");
 387                                        /* Stop the lance */
 388                                        WRITERAP(lp, LE_CSR0);
 389                                        WRITERDP(lp, LE_C0_STOP);
 390                                        lance_init_ring (dev);
 391                                        load_csrs (lp);
 392                                        init_restart_lance (lp);
 393                                        return 0;
 394                                }
 395                        }
 396
 397                        /* buffer errors and underflows turn off the transmitter */
 398                        /* Restart the adapter */
 399                        if (status & (LE_T3_BUF|LE_T3_UFL)) {
 400                                dev->stats.tx_fifo_errors++;
 401
 402                                printk ("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
 403                                        dev->name);
 404                                /* Stop the lance */
 405                                WRITERAP(lp, LE_CSR0);
 406                                WRITERDP(lp, LE_C0_STOP);
 407                                lance_init_ring (dev);
 408                                load_csrs (lp);
 409                                init_restart_lance (lp);
 410                                return 0;
 411                        }
 412                } else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
 413                        /*
 414                         * So we don't count the packet more than once.
 415                         */
 416                        td->tmd1_bits &= ~(LE_T1_POK);
 417
 418                        /* One collision before packet was sent. */
 419                        if (td->tmd1_bits & LE_T1_EONE)
 420                                dev->stats.collisions++;
 421
 422                        /* More than one collision, be optimistic. */
 423                        if (td->tmd1_bits & LE_T1_EMORE)
 424                                dev->stats.collisions += 2;
 425
 426                        dev->stats.tx_packets++;
 427                }
 428
 429                j = (j + 1) & lp->tx_ring_mod_mask;
 430        }
 431        lp->tx_old = j;
 432        WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
 433        return 0;
 434}
 435
 436static irqreturn_t
 437lance_interrupt (int irq, void *dev_id)
 438{
 439        struct net_device *dev = (struct net_device *)dev_id;
 440        struct lance_private *lp = netdev_priv(dev);
 441        int csr0;
 442
 443        spin_lock (&lp->devlock);
 444
 445        WRITERAP(lp, LE_CSR0);              /* LANCE Controller Status */
 446        csr0 = READRDP(lp);
 447
 448        PRINT_RINGS();
 449
 450        if (!(csr0 & LE_C0_INTR)) {     /* Check if any interrupt has */
 451                spin_unlock (&lp->devlock);
 452                return IRQ_NONE;        /* been generated by the Lance. */
 453        }
 454
 455        /* Acknowledge all the interrupt sources ASAP */
 456        WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
 457
 458        if ((csr0 & LE_C0_ERR)) {
 459                /* Clear the error condition */
 460                WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
 461        }
 462
 463        if (csr0 & LE_C0_RINT)
 464                lance_rx (dev);
 465
 466        if (csr0 & LE_C0_TINT)
 467                lance_tx (dev);
 468
 469        /* Log misc errors. */
 470        if (csr0 & LE_C0_BABL)
 471                dev->stats.tx_errors++;       /* Tx babble. */
 472        if (csr0 & LE_C0_MISS)
 473                dev->stats.rx_errors++;       /* Missed a Rx frame. */
 474        if (csr0 & LE_C0_MERR) {
 475                printk("%s: Bus master arbitration failure, status %4.4x.\n",
 476                       dev->name, csr0);
 477                /* Restart the chip. */
 478                WRITERDP(lp, LE_C0_STRT);
 479        }
 480
 481        if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
 482                lp->tx_full = 0;
 483                netif_wake_queue (dev);
 484        }
 485
 486        WRITERAP(lp, LE_CSR0);
 487        WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
 488
 489        spin_unlock (&lp->devlock);
 490        return IRQ_HANDLED;
 491}
 492
 493int lance_open (struct net_device *dev)
 494{
 495        struct lance_private *lp = netdev_priv(dev);
 496        int res;
 497
 498        /* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
 499        if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
 500                return -EAGAIN;
 501
 502        res = lance_reset(dev);
 503        spin_lock_init(&lp->devlock);
 504        netif_start_queue (dev);
 505
 506        return res;
 507}
 508EXPORT_SYMBOL_GPL(lance_open);
 509
 510int lance_close (struct net_device *dev)
 511{
 512        struct lance_private *lp = netdev_priv(dev);
 513
 514        netif_stop_queue (dev);
 515
 516        /* Stop the LANCE */
 517        WRITERAP(lp, LE_CSR0);
 518        WRITERDP(lp, LE_C0_STOP);
 519
 520        free_irq(lp->irq, dev);
 521
 522        return 0;
 523}
 524EXPORT_SYMBOL_GPL(lance_close);
 525
 526void lance_tx_timeout(struct net_device *dev)
 527{
 528        printk("lance_tx_timeout\n");
 529        lance_reset(dev);
 530        dev->trans_start = jiffies;
 531        netif_wake_queue (dev);
 532}
 533EXPORT_SYMBOL_GPL(lance_tx_timeout);
 534
 535int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
 536{
 537        struct lance_private *lp = netdev_priv(dev);
 538        volatile struct lance_init_block *ib = lp->init_block;
 539        int entry, skblen, len;
 540        static int outs;
 541        unsigned long flags;
 542
 543        if (!TX_BUFFS_AVAIL)
 544                return NETDEV_TX_LOCKED;
 545
 546        netif_stop_queue (dev);
 547
 548        skblen = skb->len;
 549
 550#ifdef DEBUG_DRIVER
 551        /* dump the packet */
 552        {
 553                int i;
 554
 555                for (i = 0; i < 64; i++) {
 556                        if ((i % 16) == 0)
 557                                printk ("\n");
 558                        printk ("%2.2x ", skb->data [i]);
 559                }
 560        }
 561#endif
 562        len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
 563        entry = lp->tx_new & lp->tx_ring_mod_mask;
 564        ib->btx_ring [entry].length = (-len) | 0xf000;
 565        ib->btx_ring [entry].misc = 0;
 566
 567        if (skb->len < ETH_ZLEN)
 568                memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
 569        skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
 570
 571        /* Now, give the packet to the lance */
 572        ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
 573        lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
 574
 575        outs++;
 576        /* Kick the lance: transmit now */
 577        WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
 578        dev->trans_start = jiffies;
 579        dev_kfree_skb (skb);
 580
 581        spin_lock_irqsave (&lp->devlock, flags);
 582        if (TX_BUFFS_AVAIL)
 583                netif_start_queue (dev);
 584        else
 585                lp->tx_full = 1;
 586        spin_unlock_irqrestore (&lp->devlock, flags);
 587
 588        return NETDEV_TX_OK;
 589}
 590EXPORT_SYMBOL_GPL(lance_start_xmit);
 591
 592/* taken from the depca driver via a2065.c */
 593static void lance_load_multicast (struct net_device *dev)
 594{
 595        struct lance_private *lp = netdev_priv(dev);
 596        volatile struct lance_init_block *ib = lp->init_block;
 597        volatile u16 *mcast_table = (u16 *)&ib->filter;
 598        struct dev_mc_list *dmi=dev->mc_list;
 599        char *addrs;
 600        int i;
 601        u32 crc;
 602
 603        /* set all multicast bits */
 604        if (dev->flags & IFF_ALLMULTI){
 605                ib->filter [0] = 0xffffffff;
 606                ib->filter [1] = 0xffffffff;
 607                return;
 608        }
 609        /* clear the multicast filter */
 610        ib->filter [0] = 0;
 611        ib->filter [1] = 0;
 612
 613        /* Add addresses */
 614        for (i = 0; i < dev->mc_count; i++){
 615                addrs = dmi->dmi_addr;
 616                dmi   = dmi->next;
 617
 618                /* multicast address? */
 619                if (!(*addrs & 1))
 620                        continue;
 621
 622                crc = ether_crc_le(6, addrs);
 623                crc = crc >> 26;
 624                mcast_table [crc >> 4] |= 1 << (crc & 0xf);
 625        }
 626        return;
 627}
 628
 629
 630void lance_set_multicast (struct net_device *dev)
 631{
 632        struct lance_private *lp = netdev_priv(dev);
 633        volatile struct lance_init_block *ib = lp->init_block;
 634        int stopped;
 635
 636        stopped = netif_queue_stopped(dev);
 637        if (!stopped)
 638                netif_stop_queue (dev);
 639
 640        while (lp->tx_old != lp->tx_new)
 641                schedule();
 642
 643        WRITERAP(lp, LE_CSR0);
 644        WRITERDP(lp, LE_C0_STOP);
 645        lance_init_ring (dev);
 646
 647        if (dev->flags & IFF_PROMISC) {
 648                ib->mode |= LE_MO_PROM;
 649        } else {
 650                ib->mode &= ~LE_MO_PROM;
 651                lance_load_multicast (dev);
 652        }
 653        load_csrs (lp);
 654        init_restart_lance (lp);
 655
 656        if (!stopped)
 657                netif_start_queue (dev);
 658}
 659EXPORT_SYMBOL_GPL(lance_set_multicast);
 660
 661#ifdef CONFIG_NET_POLL_CONTROLLER
 662void lance_poll(struct net_device *dev)
 663{
 664        struct lance_private *lp = netdev_priv(dev);
 665
 666        spin_lock (&lp->devlock);
 667        WRITERAP(lp, LE_CSR0);
 668        WRITERDP(lp, LE_C0_STRT);
 669        spin_unlock (&lp->devlock);
 670        lance_interrupt(dev->irq, dev);
 671}
 672#endif
 673
 674MODULE_LICENSE("GPL");
 675