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