LXR linux/drivers/net/ariadne.c

   1/*
   2 *  Amiga Linux/m68k Ariadne Ethernet Driver
   3 *
   4 *  © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
   5 *                           Peter De Schrijver (p2@mind.be)
   6 *
   7 *  ---------------------------------------------------------------------------
   8 *
   9 *  This program is based on
  10 *
  11 *      lance.c:        An AMD LANCE ethernet driver for linux.
  12 *                      Written 1993-94 by Donald Becker.
  13 *
  14 *      Am79C960:       PCnet(tm)-ISA Single-Chip Ethernet Controller
  15 *                      Advanced Micro Devices
  16 *                      Publication #16907, Rev. B, Amendment/0, May 1994
  17 *
  18 *      MC68230:        Parallel Interface/Timer (PI/T)
  19 *                      Motorola Semiconductors, December, 1983
  20 *
  21 *  ---------------------------------------------------------------------------
  22 *
  23 *  This file is subject to the terms and conditions of the GNU General Public
  24 *  License.  See the file COPYING in the main directory of the Linux
  25 *  distribution for more details.
  26 *
  27 *  ---------------------------------------------------------------------------
  28 *
  29 *  The Ariadne is a Zorro-II board made by Village Tronic. It contains:
  30 *
  31 *      - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
  32 *        10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
  33 *
  34 *      - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
  35 */
  36
  37#include <linux/module.h>
  38#include <linux/stddef.h>
  39#include <linux/kernel.h>
  40#include <linux/string.h>
  41#include <linux/errno.h>
  42#include <linux/ioport.h>
  43#include <linux/slab.h>
  44#include <linux/netdevice.h>
  45#include <linux/etherdevice.h>
  46#include <linux/interrupt.h>
  47#include <linux/skbuff.h>
  48#include <linux/init.h>
  49#include <linux/zorro.h>
  50#include <linux/bitops.h>
  51
  52#include <asm/amigaints.h>
  53#include <asm/amigahw.h>
  54#include <asm/irq.h>
  55
  56#include "ariadne.h"
  57
  58
  59#ifdef ARIADNE_DEBUG
  60int ariadne_debug = ARIADNE_DEBUG;
  61#else
  62int ariadne_debug = 1;
  63#endif
  64
  65
  66    /*
  67     *  Macros to Fix Endianness problems
  68     */
  69
  70                                /* Swap the Bytes in a WORD */
  71#define swapw(x)        (((x>>8)&0x00ff)|((x<<8)&0xff00))
  72                                /* Get the Low BYTE in a WORD */
  73#define lowb(x)         (x&0xff)
  74                                /* Get the Swapped High WORD in a LONG */
  75#define swhighw(x)      ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
  76                                /* Get the Swapped Low WORD in a LONG */
  77#define swloww(x)       ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
  78
  79
  80    /*
  81     *  Transmit/Receive Ring Definitions
  82     */
  83
  84#define TX_RING_SIZE    5
  85#define RX_RING_SIZE    16
  86
  87#define PKT_BUF_SIZE    1520
  88
  89
  90    /*
  91     *  Private Device Data
  92     */
  93
  94struct ariadne_private {
  95    volatile struct TDRE *tx_ring[TX_RING_SIZE];
  96    volatile struct RDRE *rx_ring[RX_RING_SIZE];
  97    volatile u_short *tx_buff[TX_RING_SIZE];
  98    volatile u_short *rx_buff[RX_RING_SIZE];
  99    int cur_tx, cur_rx;                 /* The next free ring entry */
 100    int dirty_tx;                       /* The ring entries to be free()ed. */
 101    char tx_full;
 102};
 103
 104
 105    /*
 106     *  Structure Created in the Ariadne's RAM Buffer
 107     */
 108
 109struct lancedata {
 110    struct TDRE tx_ring[TX_RING_SIZE];
 111    struct RDRE rx_ring[RX_RING_SIZE];
 112    u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 113    u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 114};
 115
 116static int ariadne_open(struct net_device *dev);
 117static void ariadne_init_ring(struct net_device *dev);
 118static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
 119static void ariadne_tx_timeout(struct net_device *dev);
 120static int ariadne_rx(struct net_device *dev);
 121static void ariadne_reset(struct net_device *dev);
 122static irqreturn_t ariadne_interrupt(int irq, void *data);
 123static int ariadne_close(struct net_device *dev);
 124static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
 125#ifdef HAVE_MULTICAST
 126static void set_multicast_list(struct net_device *dev);
 127#endif
 128
 129
 130static void memcpyw(volatile u_short *dest, u_short *src, int len)
 131{
 132    while (len >= 2) {
 133        *(dest++) = *(src++);
 134        len -= 2;
 135    }
 136    if (len == 1)
 137        *dest = (*(u_char *)src)<<8;
 138}
 139
 140
 141static int __devinit ariadne_init_one(struct zorro_dev *z,
 142                                      const struct zorro_device_id *ent);
 143static void __devexit ariadne_remove_one(struct zorro_dev *z);
 144
 145
 146static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
 147    { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
 148    { 0 }
 149};
 150
 151static struct zorro_driver ariadne_driver = {
 152    .name       = "ariadne",
 153    .id_table   = ariadne_zorro_tbl,
 154    .probe      = ariadne_init_one,
 155    .remove     = __devexit_p(ariadne_remove_one),
 156};
 157
 158static const struct net_device_ops ariadne_netdev_ops = {
 159        .ndo_open               = ariadne_open,
 160        .ndo_stop               = ariadne_close,
 161        .ndo_start_xmit         = ariadne_start_xmit,
 162        .ndo_tx_timeout         = ariadne_tx_timeout,
 163        .ndo_get_stats          = ariadne_get_stats,
 164        .ndo_set_multicast_list = set_multicast_list,
 165        .ndo_validate_addr      = eth_validate_addr,
 166        .ndo_change_mtu         = eth_change_mtu,
 167        .ndo_set_mac_address    = eth_mac_addr,
 168};
 169
 170static int __devinit ariadne_init_one(struct zorro_dev *z,
 171                                      const struct zorro_device_id *ent)
 172{
 173    unsigned long board = z->resource.start;
 174    unsigned long base_addr = board+ARIADNE_LANCE;
 175    unsigned long mem_start = board+ARIADNE_RAM;
 176    struct resource *r1, *r2;
 177    struct net_device *dev;
 178    struct ariadne_private *priv;
 179    int err;
 180
 181    r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
 182    if (!r1)
 183        return -EBUSY;
 184    r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
 185    if (!r2) {
 186        release_resource(r1);
 187        return -EBUSY;
 188    }
 189
 190    dev = alloc_etherdev(sizeof(struct ariadne_private));
 191    if (dev == NULL) {
 192        release_resource(r1);
 193        release_resource(r2);
 194        return -ENOMEM;
 195    }
 196
 197    priv = netdev_priv(dev);
 198
 199    r1->name = dev->name;
 200    r2->name = dev->name;
 201
 202    dev->dev_addr[0] = 0x00;
 203    dev->dev_addr[1] = 0x60;
 204    dev->dev_addr[2] = 0x30;
 205    dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
 206    dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
 207    dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
 208    dev->base_addr = ZTWO_VADDR(base_addr);
 209    dev->mem_start = ZTWO_VADDR(mem_start);
 210    dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
 211
 212    dev->netdev_ops = &ariadne_netdev_ops;
 213    dev->watchdog_timeo = 5*HZ;
 214
 215    err = register_netdev(dev);
 216    if (err) {
 217        release_resource(r1);
 218        release_resource(r2);
 219        free_netdev(dev);
 220        return err;
 221    }
 222    zorro_set_drvdata(z, dev);
 223
 224    printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address %pM\n",
 225           dev->name, board, dev->dev_addr);
 226
 227    return 0;
 228}
 229
 230
 231static int ariadne_open(struct net_device *dev)
 232{
 233    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 234    u_short in;
 235    u_long version;
 236    int i;
 237
 238    /* Reset the LANCE */
 239    in = lance->Reset;
 240
 241    /* Stop the LANCE */
 242    lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 243    lance->RDP = STOP;
 244
 245    /* Check the LANCE version */
 246    lance->RAP = CSR88;         /* Chip ID */
 247    version = swapw(lance->RDP);
 248    lance->RAP = CSR89;         /* Chip ID */
 249    version |= swapw(lance->RDP)<<16;
 250    if ((version & 0x00000fff) != 0x00000003) {
 251        printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
 252        return -EAGAIN;
 253    }
 254    if ((version & 0x0ffff000) != 0x00003000) {
 255        printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
 256               "number = %ld)\n", (version & 0x0ffff000)>>12);
 257        return -EAGAIN;
 258    }
 259#if 0
 260    printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
 261           (version & 0xf0000000)>>28);
 262#endif
 263
 264    ariadne_init_ring(dev);
 265
 266    /* Miscellaneous Stuff */
 267    lance->RAP = CSR3;          /* Interrupt Masks and Deferral Control */
 268    lance->RDP = 0x0000;
 269    lance->RAP = CSR4;          /* Test and Features Control */
 270    lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
 271
 272    /* Set the Multicast Table */
 273    lance->RAP = CSR8;          /* Logical Address Filter, LADRF[15:0] */
 274    lance->RDP = 0x0000;
 275    lance->RAP = CSR9;          /* Logical Address Filter, LADRF[31:16] */
 276    lance->RDP = 0x0000;
 277    lance->RAP = CSR10;         /* Logical Address Filter, LADRF[47:32] */
 278    lance->RDP = 0x0000;
 279    lance->RAP = CSR11;         /* Logical Address Filter, LADRF[63:48] */
 280    lance->RDP = 0x0000;
 281
 282    /* Set the Ethernet Hardware Address */
 283    lance->RAP = CSR12;         /* Physical Address Register, PADR[15:0] */
 284    lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
 285    lance->RAP = CSR13;         /* Physical Address Register, PADR[31:16] */
 286    lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
 287    lance->RAP = CSR14;         /* Physical Address Register, PADR[47:32] */
 288    lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
 289
 290    /* Set the Init Block Mode */
 291    lance->RAP = CSR15;         /* Mode Register */
 292    lance->RDP = 0x0000;
 293
 294    /* Set the Transmit Descriptor Ring Pointer */
 295    lance->RAP = CSR30;         /* Base Address of Transmit Ring */
 296    lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 297    lance->RAP = CSR31;         /* Base Address of transmit Ring */
 298    lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 299
 300    /* Set the Receive Descriptor Ring Pointer */
 301    lance->RAP = CSR24;         /* Base Address of Receive Ring */
 302    lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 303    lance->RAP = CSR25;         /* Base Address of Receive Ring */
 304    lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 305
 306    /* Set the Number of RX and TX Ring Entries */
 307    lance->RAP = CSR76;         /* Receive Ring Length */
 308    lance->RDP = swapw(((u_short)-RX_RING_SIZE));
 309    lance->RAP = CSR78;         /* Transmit Ring Length */
 310    lance->RDP = swapw(((u_short)-TX_RING_SIZE));
 311
 312    /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
 313    lance->RAP = ISACSR2;       /* Miscellaneous Configuration */
 314    lance->IDP = ASEL;
 315
 316    /* LED Control */
 317    lance->RAP = ISACSR5;       /* LED1 Status */
 318    lance->IDP = PSE|XMTE;
 319    lance->RAP = ISACSR6;       /* LED2 Status */
 320    lance->IDP = PSE|COLE;
 321    lance->RAP = ISACSR7;       /* LED3 Status */
 322    lance->IDP = PSE|RCVE;
 323
 324    netif_start_queue(dev);
 325
 326    i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
 327                    dev->name, dev);
 328    if (i) return i;
 329
 330    lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 331    lance->RDP = INEA|STRT;
 332
 333    return 0;
 334}
 335
 336
 337static void ariadne_init_ring(struct net_device *dev)
 338{
 339    struct ariadne_private *priv = netdev_priv(dev);
 340    volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
 341    int i;
 342
 343    netif_stop_queue(dev);
 344
 345    priv->tx_full = 0;
 346    priv->cur_rx = priv->cur_tx = 0;
 347    priv->dirty_tx = 0;
 348
 349    /* Set up TX Ring */
 350    for (i = 0; i < TX_RING_SIZE; i++) {
 351        volatile struct TDRE *t = &lancedata->tx_ring[i];
 352        t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
 353        t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
 354                  TF_STP | TF_ENP;
 355        t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
 356        t->TMD3 = 0;
 357        priv->tx_ring[i] = &lancedata->tx_ring[i];
 358        priv->tx_buff[i] = lancedata->tx_buff[i];
 359#if 0
 360        printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
 361               &lancedata->tx_ring[i], lancedata->tx_buff[i]);
 362#endif
 363    }
 364
 365    /* Set up RX Ring */
 366    for (i = 0; i < RX_RING_SIZE; i++) {
 367        volatile struct RDRE *r = &lancedata->rx_ring[i];
 368        r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
 369        r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
 370                  RF_OWN;
 371        r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
 372        r->RMD3 = 0x0000;
 373        priv->rx_ring[i] = &lancedata->rx_ring[i];
 374        priv->rx_buff[i] = lancedata->rx_buff[i];
 375#if 0
 376        printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
 377               &lancedata->rx_ring[i], lancedata->rx_buff[i]);
 378#endif
 379    }
 380}
 381
 382
 383static int ariadne_close(struct net_device *dev)
 384{
 385    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 386
 387    netif_stop_queue(dev);
 388
 389    lance->RAP = CSR112;        /* Missed Frame Count */
 390    dev->stats.rx_missed_errors = swapw(lance->RDP);
 391    lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 392
 393    if (ariadne_debug > 1) {
 394        printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
 395               dev->name, lance->RDP);
 396        printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
 397               dev->stats.rx_missed_errors);
 398    }
 399
 400    /* We stop the LANCE here -- it occasionally polls memory if we don't. */
 401    lance->RDP = STOP;
 402
 403    free_irq(IRQ_AMIGA_PORTS, dev);
 404
 405    return 0;
 406}
 407
 408
 409static inline void ariadne_reset(struct net_device *dev)
 410{
 411    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 412
 413    lance->RAP = CSR0;  /* PCnet-ISA Controller Status */
 414    lance->RDP = STOP;
 415    ariadne_init_ring(dev);
 416    lance->RDP = INEA|STRT;
 417    netif_start_queue(dev);
 418}
 419
 420
 421static irqreturn_t ariadne_interrupt(int irq, void *data)
 422{
 423    struct net_device *dev = (struct net_device *)data;
 424    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 425    struct ariadne_private *priv;
 426    int csr0, boguscnt;
 427    int handled = 0;
 428
 429    if (dev == NULL) {
 430        printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
 431        return IRQ_NONE;
 432    }
 433
 434    lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 435
 436    if (!(lance->RDP & INTR))           /* Check if any interrupt has been */
 437        return IRQ_NONE;                /* generated by the board. */
 438
 439    priv = netdev_priv(dev);
 440
 441    boguscnt = 10;
 442    while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
 443        /* Acknowledge all of the current interrupt sources ASAP. */
 444        lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
 445
 446#if 0
 447        if (ariadne_debug > 5) {
 448            printk(KERN_DEBUG "%s: interrupt  csr0=%#2.2x new csr=%#2.2x.",
 449                   dev->name, csr0, lance->RDP);
 450            printk("[");
 451            if (csr0 & INTR)
 452                printk(" INTR");
 453            if (csr0 & INEA)
 454                printk(" INEA");
 455            if (csr0 & RXON)
 456                printk(" RXON");
 457            if (csr0 & TXON)
 458                printk(" TXON");
 459            if (csr0 & TDMD)
 460                printk(" TDMD");
 461            if (csr0 & STOP)
 462                printk(" STOP");
 463            if (csr0 & STRT)
 464                printk(" STRT");
 465            if (csr0 & INIT)
 466                printk(" INIT");
 467            if (csr0 & ERR)
 468                printk(" ERR");
 469            if (csr0 & BABL)
 470                printk(" BABL");
 471            if (csr0 & CERR)
 472                printk(" CERR");
 473            if (csr0 & MISS)
 474                printk(" MISS");
 475            if (csr0 & MERR)
 476                printk(" MERR");
 477            if (csr0 & RINT)
 478                printk(" RINT");
 479            if (csr0 & TINT)
 480                printk(" TINT");
 481            if (csr0 & IDON)
 482                printk(" IDON");
 483            printk(" ]\n");
 484        }
 485#endif
 486
 487        if (csr0 & RINT) {      /* Rx interrupt */
 488            handled = 1;
 489            ariadne_rx(dev);
 490        }
 491
 492        if (csr0 & TINT) {      /* Tx-done interrupt */
 493            int dirty_tx = priv->dirty_tx;
 494
 495            handled = 1;
 496            while (dirty_tx < priv->cur_tx) {
 497                int entry = dirty_tx % TX_RING_SIZE;
 498                int status = lowb(priv->tx_ring[entry]->TMD1);
 499
 500                if (status & TF_OWN)
 501                    break;      /* It still hasn't been Txed */
 502
 503                priv->tx_ring[entry]->TMD1 &= 0xff00;
 504
 505                if (status & TF_ERR) {
 506                    /* There was an major error, log it. */
 507                    int err_status = priv->tx_ring[entry]->TMD3;
 508                    dev->stats.tx_errors++;
 509                    if (err_status & EF_RTRY)
 510                        dev->stats.tx_aborted_errors++;
 511                    if (err_status & EF_LCAR)
 512                        dev->stats.tx_carrier_errors++;
 513                    if (err_status & EF_LCOL)
 514                        dev->stats.tx_window_errors++;
 515                    if (err_status & EF_UFLO) {
 516                        /* Ackk!  On FIFO errors the Tx unit is turned off! */
 517                        dev->stats.tx_fifo_errors++;
 518                        /* Remove this verbosity later! */
 519                        printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
 520                               dev->name, csr0);
 521                        /* Restart the chip. */
 522                        lance->RDP = STRT;
 523                    }
 524                } else {
 525                    if (status & (TF_MORE|TF_ONE))
 526                        dev->stats.collisions++;
 527                    dev->stats.tx_packets++;
 528                }
 529                dirty_tx++;
 530            }
 531
 532#ifndef final_version
 533            if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
 534                printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
 535                       "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
 536                dirty_tx += TX_RING_SIZE;
 537            }
 538#endif
 539
 540            if (priv->tx_full && netif_queue_stopped(dev) &&
 541                dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
 542                /* The ring is no longer full. */
 543                priv->tx_full = 0;
 544                netif_wake_queue(dev);
 545            }
 546
 547            priv->dirty_tx = dirty_tx;
 548        }
 549
 550        /* Log misc errors. */
 551        if (csr0 & BABL) {
 552            handled = 1;
 553            dev->stats.tx_errors++;     /* Tx babble. */
 554        }
 555        if (csr0 & MISS) {
 556            handled = 1;
 557            dev->stats.rx_errors++;     /* Missed a Rx frame. */
 558        }
 559        if (csr0 & MERR) {
 560            handled = 1;
 561            printk(KERN_ERR "%s: Bus master arbitration failure, status "
 562                   "%4.4x.\n", dev->name, csr0);
 563            /* Restart the chip. */
 564            lance->RDP = STRT;
 565        }
 566    }
 567
 568    /* Clear any other interrupt, and set interrupt enable. */
 569    lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 570    lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
 571
 572#if 0
 573    if (ariadne_debug > 4)
 574        printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
 575               lance->RAP, lance->RDP);
 576#endif
 577    return IRQ_RETVAL(handled);
 578}
 579
 580
 581static void ariadne_tx_timeout(struct net_device *dev)
 582{
 583    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 584
 585    printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
 586           dev->name, lance->RDP);
 587    ariadne_reset(dev);
 588    netif_wake_queue(dev);
 589}
 590
 591
 592static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
 593{
 594    struct ariadne_private *priv = netdev_priv(dev);
 595    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 596    int entry;
 597    unsigned long flags;
 598    int len = skb->len;
 599
 600#if 0
 601    if (ariadne_debug > 3) {
 602        lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
 603        printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
 604               dev->name, lance->RDP);
 605        lance->RDP = 0x0000;
 606    }
 607#endif
 608
 609    /* FIXME: is the 79C960 new enough to do its own padding right ? */
 610    if (skb->len < ETH_ZLEN)
 611    {
 612        if (skb_padto(skb, ETH_ZLEN))
 613            return 0;
 614        len = ETH_ZLEN;
 615    }
 616
 617    /* Fill in a Tx ring entry */
 618
 619#if 0
 620{
 621    printk(KERN_DEBUG "TX pkt type 0x%04x from %pM to %pM "
 622           " data 0x%08x len %d\n",
 623           ((u_short *)skb->data)[6],
 624           skb->data + 6, skb->data,
 625           (int)skb->data, (int)skb->len);
 626}
 627#endif
 628
 629    local_irq_save(flags);
 630
 631    entry = priv->cur_tx % TX_RING_SIZE;
 632
 633    /* Caution: the write order is important here, set the base address with
 634                the "ownership" bits last. */
 635
 636    priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
 637    priv->tx_ring[entry]->TMD3 = 0x0000;
 638    memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
 639
 640#if 0
 641    {
 642        int i, len;
 643
 644        len = skb->len > 64 ? 64 : skb->len;
 645        len >>= 1;
 646        for (i = 0; i < len; i += 8) {
 647            int j;
 648            printk(KERN_DEBUG "%04x:", i);
 649            for (j = 0; (j < 8) && ((i+j) < len); j++) {
 650                if (!(j & 1))
 651                    printk(" ");
 652                printk("%04x", priv->tx_buff[entry][i+j]);
 653            }
 654            printk("\n");
 655        }
 656    }
 657#endif
 658
 659    priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
 660
 661    dev_kfree_skb(skb);
 662
 663    priv->cur_tx++;
 664    if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
 665
 666#if 0
 667        printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
 668               "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
 669#endif
 670
 671        priv->cur_tx -= TX_RING_SIZE;
 672        priv->dirty_tx -= TX_RING_SIZE;
 673    }
 674    dev->stats.tx_bytes += len;
 675
 676    /* Trigger an immediate send poll. */
 677    lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 678    lance->RDP = INEA|TDMD;
 679
 680    dev->trans_start = jiffies;
 681
 682    if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
 683        netif_stop_queue(dev);
 684        priv->tx_full = 1;
 685    }
 686    local_irq_restore(flags);
 687
 688    return 0;
 689}
 690
 691
 692static int ariadne_rx(struct net_device *dev)
 693{
 694    struct ariadne_private *priv = netdev_priv(dev);
 695    int entry = priv->cur_rx % RX_RING_SIZE;
 696    int i;
 697
 698    /* If we own the next entry, it's a new packet. Send it up. */
 699    while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
 700        int status = lowb(priv->rx_ring[entry]->RMD1);
 701
 702        if (status != (RF_STP|RF_ENP)) {        /* There was an error. */
 703            /* There is a tricky error noted by John Murphy,
 704                <murf@perftech.com> to Russ Nelson: Even with full-sized
 705                buffers it's possible for a jabber packet to use two
 706                buffers, with only the last correctly noting the error. */
 707            if (status & RF_ENP)
 708                /* Only count a general error at the end of a packet.*/
 709                dev->stats.rx_errors++;
 710            if (status & RF_FRAM)
 711                dev->stats.rx_frame_errors++;
 712            if (status & RF_OFLO)
 713                dev->stats.rx_over_errors++;
 714            if (status & RF_CRC)
 715                dev->stats.rx_crc_errors++;
 716            if (status & RF_BUFF)
 717                dev->stats.rx_fifo_errors++;
 718            priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
 719        } else {
 720            /* Malloc up new buffer, compatible with net-3. */
 721            short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
 722            struct sk_buff *skb;
 723
 724            skb = dev_alloc_skb(pkt_len+2);
 725            if (skb == NULL) {
 726                printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
 727                       dev->name);
 728                for (i = 0; i < RX_RING_SIZE; i++)
 729                    if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
 730                        break;
 731
 732                if (i > RX_RING_SIZE-2) {
 733                    dev->stats.rx_dropped++;
 734                    priv->rx_ring[entry]->RMD1 |= RF_OWN;
 735                    priv->cur_rx++;
 736                }
 737                break;
 738            }
 739
 740
 741            skb_reserve(skb,2);         /* 16 byte align */
 742            skb_put(skb,pkt_len);       /* Make room */
 743            skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
 744            skb->protocol=eth_type_trans(skb,dev);
 745#if 0
 746{
 747            printk(KERN_DEBUG "RX pkt type 0x%04x from ",
 748                   ((u_short *)skb->data)[6]);
 749            {
 750                u_char *ptr = &((u_char *)skb->data)[6];
 751                printk("%pM", ptr);
 752            }
 753            printk(" to ");
 754            {
 755                u_char *ptr = (u_char *)skb->data;
 756                printk("%pM", ptr);
 757            }
 758            printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 759}
 760#endif
 761
 762            netif_rx(skb);
 763            dev->stats.rx_packets++;
 764            dev->stats.rx_bytes += pkt_len;
 765        }
 766
 767        priv->rx_ring[entry]->RMD1 |= RF_OWN;
 768        entry = (++priv->cur_rx) % RX_RING_SIZE;
 769    }
 770
 771    priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
 772
 773    /* We should check that at least two ring entries are free.  If not,
 774       we should free one and mark stats->rx_dropped++. */
 775
 776    return 0;
 777}
 778
 779
 780static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
 781{
 782    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 783    short saved_addr;
 784    unsigned long flags;
 785
 786    local_irq_save(flags);
 787    saved_addr = lance->RAP;
 788    lance->RAP = CSR112;                /* Missed Frame Count */
 789    dev->stats.rx_missed_errors = swapw(lance->RDP);
 790    lance->RAP = saved_addr;
 791    local_irq_restore(flags);
 792
 793    return &dev->stats;
 794}
 795
 796
 797/* Set or clear the multicast filter for this adaptor.
 798    num_addrs == -1     Promiscuous mode, receive all packets
 799    num_addrs == 0      Normal mode, clear multicast list
 800    num_addrs > 0       Multicast mode, receive normal and MC packets, and do
 801                        best-effort filtering.
 802 */
 803static void set_multicast_list(struct net_device *dev)
 804{
 805    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 806
 807    if (!netif_running(dev))
 808        return;
 809
 810    netif_stop_queue(dev);
 811
 812    /* We take the simple way out and always enable promiscuous mode. */
 813    lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 814    lance->RDP = STOP;                  /* Temporarily stop the lance. */
 815    ariadne_init_ring(dev);
 816
 817    if (dev->flags & IFF_PROMISC) {
 818        lance->RAP = CSR15;             /* Mode Register */
 819        lance->RDP = PROM;              /* Set promiscuous mode */
 820    } else {
 821        short multicast_table[4];
 822        int num_addrs = dev->mc_count;
 823        int i;
 824        /* We don't use the multicast table, but rely on upper-layer filtering. */
 825        memset(multicast_table, (num_addrs == 0) ? 0 : -1,
 826               sizeof(multicast_table));
 827        for (i = 0; i < 4; i++) {
 828            lance->RAP = CSR8+(i<<8);   /* Logical Address Filter */
 829            lance->RDP = swapw(multicast_table[i]);
 830        }
 831        lance->RAP = CSR15;             /* Mode Register */
 832        lance->RDP = 0x0000;            /* Unset promiscuous mode */
 833    }
 834
 835    lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 836    lance->RDP = INEA|STRT|IDON;        /* Resume normal operation. */
 837
 838    netif_wake_queue(dev);
 839}
 840
 841
 842static void __devexit ariadne_remove_one(struct zorro_dev *z)
 843{
 844    struct net_device *dev = zorro_get_drvdata(z);
 845
 846    unregister_netdev(dev);
 847    release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
 848    release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
 849    free_netdev(dev);
 850}
 851
 852static int __init ariadne_init_module(void)
 853{
 854    return zorro_register_driver(&ariadne_driver);
 855}
 856
 857static void __exit ariadne_cleanup_module(void)
 858{
 859    zorro_unregister_driver(&ariadne_driver);
 860}
 861
 862module_init(ariadne_init_module);
 863module_exit(ariadne_cleanup_module);
 864
 865MODULE_LICENSE("GPL");
 866