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     DECLARE_MAC_BUF(mac);
 169
 170     r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
 171     if (!r1)
 172         return -EBUSY;
 173     r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
 174     if (!r2) {
 175         release_resource(r1);
 176         return -EBUSY;
 177     }
 178
 179     dev = alloc_etherdev(sizeof(struct ariadne_private));
 180     if (dev == NULL) {
 181         release_resource(r1);
 182         release_resource(r2);
 183         return -ENOMEM;
 184     }
 185
 186     priv = netdev_priv(dev);
 187
 188     r1->name = dev->name;
 189     r2->name = dev->name;
 190
 191     dev->dev_addr[0] = 0x00;
 192     dev->dev_addr[1] = 0x60;
 193     dev->dev_addr[2] = 0x30;
 194     dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
 195     dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
 196     dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
 197     dev->base_addr = ZTWO_VADDR(base_addr);
 198     dev->mem_start = ZTWO_VADDR(mem_start);
 199     dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
 200
 201     dev->open = &ariadne_open;
 202     dev->stop = &ariadne_close;
 203     dev->hard_start_xmit = &ariadne_start_xmit;
 204     dev->tx_timeout = &ariadne_tx_timeout;
 205     dev->watchdog_timeo = 5*HZ;
 206     dev->get_stats = &ariadne_get_stats;
 207     dev->set_multicast_list = &set_multicast_list;
 208
 209     err = register_netdev(dev);
 210     if (err) {
 211         release_resource(r1);
 212         release_resource(r2);
 213         free_netdev(dev);
 214         return err;
 215     }
 216     zorro_set_drvdata(z, dev);
 217
 218     printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address "
 219            "%s\n", dev->name, board,
 220            print_mac(mac, dev->dev_addr));
 221
 222     return 0;
 223 }
 224
 225
 226 static int ariadne_open(struct net_device *dev)
 227 {
 228     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 229     u_short in;
 230     u_long version;
 231     int i;
 232
 233     /* Reset the LANCE */
 234     in = lance->Reset;
 235
 236     /* Stop the LANCE */
 237     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 238     lance->RDP = STOP;
 239
 240     /* Check the LANCE version */
 241     lance->RAP = CSR88;         /* Chip ID */
 242     version = swapw(lance->RDP);
 243     lance->RAP = CSR89;         /* Chip ID */
 244     version |= swapw(lance->RDP)<<16;
 245     if ((version & 0x00000fff) != 0x00000003) {
 246         printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
 247         return -EAGAIN;
 248     }
 249     if ((version & 0x0ffff000) != 0x00003000) {
 250         printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
 251                "number = %ld)\n", (version & 0x0ffff000)>>12);
 252         return -EAGAIN;
 253     }
 254 #if 0
 255     printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
 256            (version & 0xf0000000)>>28);
 257 #endif
 258
 259     ariadne_init_ring(dev);
 260
 261     /* Miscellaneous Stuff */
 262     lance->RAP = CSR3;          /* Interrupt Masks and Deferral Control */
 263     lance->RDP = 0x0000;
 264     lance->RAP = CSR4;          /* Test and Features Control */
 265     lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
 266
 267     /* Set the Multicast Table */
 268     lance->RAP = CSR8;          /* Logical Address Filter, LADRF[15:0] */
 269     lance->RDP = 0x0000;
 270     lance->RAP = CSR9;          /* Logical Address Filter, LADRF[31:16] */
 271     lance->RDP = 0x0000;
 272     lance->RAP = CSR10;         /* Logical Address Filter, LADRF[47:32] */
 273     lance->RDP = 0x0000;
 274     lance->RAP = CSR11;         /* Logical Address Filter, LADRF[63:48] */
 275     lance->RDP = 0x0000;
 276
 277     /* Set the Ethernet Hardware Address */
 278     lance->RAP = CSR12;         /* Physical Address Register, PADR[15:0] */
 279     lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
 280     lance->RAP = CSR13;         /* Physical Address Register, PADR[31:16] */
 281     lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
 282     lance->RAP = CSR14;         /* Physical Address Register, PADR[47:32] */
 283     lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
 284
 285     /* Set the Init Block Mode */
 286     lance->RAP = CSR15;         /* Mode Register */
 287     lance->RDP = 0x0000;
 288
 289     /* Set the Transmit Descriptor Ring Pointer */
 290     lance->RAP = CSR30;         /* Base Address of Transmit Ring */
 291     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 292     lance->RAP = CSR31;         /* Base Address of transmit Ring */
 293     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 294
 295     /* Set the Receive Descriptor Ring Pointer */
 296     lance->RAP = CSR24;         /* Base Address of Receive Ring */
 297     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 298     lance->RAP = CSR25;         /* Base Address of Receive Ring */
 299     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 300
 301     /* Set the Number of RX and TX Ring Entries */
 302     lance->RAP = CSR76;         /* Receive Ring Length */
 303     lance->RDP = swapw(((u_short)-RX_RING_SIZE));
 304     lance->RAP = CSR78;         /* Transmit Ring Length */
 305     lance->RDP = swapw(((u_short)-TX_RING_SIZE));
 306
 307     /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
 308     lance->RAP = ISACSR2;       /* Miscellaneous Configuration */
 309     lance->IDP = ASEL;
 310
 311     /* LED Control */
 312     lance->RAP = ISACSR5;       /* LED1 Status */
 313     lance->IDP = PSE|XMTE;
 314     lance->RAP = ISACSR6;       /* LED2 Status */
 315     lance->IDP = PSE|COLE;
 316     lance->RAP = ISACSR7;       /* LED3 Status */
 317     lance->IDP = PSE|RCVE;
 318
 319     netif_start_queue(dev);
 320
 321     i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
 322                     dev->name, dev);
 323     if (i) return i;
 324
 325     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 326     lance->RDP = INEA|STRT;
 327
 328     return 0;
 329 }
 330
 331
 332 static void ariadne_init_ring(struct net_device *dev)
 333 {
 334     struct ariadne_private *priv = netdev_priv(dev);
 335     volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
 336     int i;
 337
 338     netif_stop_queue(dev);
 339
 340     priv->tx_full = 0;
 341     priv->cur_rx = priv->cur_tx = 0;
 342     priv->dirty_tx = 0;
 343
 344     /* Set up TX Ring */
 345     for (i = 0; i < TX_RING_SIZE; i++) {
 346         volatile struct TDRE *t = &lancedata->tx_ring[i];
 347         t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
 348         t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
 349                   TF_STP | TF_ENP;
 350         t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
 351         t->TMD3 = 0;
 352         priv->tx_ring[i] = &lancedata->tx_ring[i];
 353         priv->tx_buff[i] = lancedata->tx_buff[i];
 354 #if 0
 355         printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
 356                &lancedata->tx_ring[i], lancedata->tx_buff[i]);
 357 #endif
 358     }
 359
 360     /* Set up RX Ring */
 361     for (i = 0; i < RX_RING_SIZE; i++) {
 362         volatile struct RDRE *r = &lancedata->rx_ring[i];
 363         r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
 364         r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
 365                   RF_OWN;
 366         r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
 367         r->RMD3 = 0x0000;
 368         priv->rx_ring[i] = &lancedata->rx_ring[i];
 369         priv->rx_buff[i] = lancedata->rx_buff[i];
 370 #if 0
 371         printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
 372                &lancedata->rx_ring[i], lancedata->rx_buff[i]);
 373 #endif
 374     }
 375 }
 376
 377
 378 static int ariadne_close(struct net_device *dev)
 379 {
 380     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 381
 382     netif_stop_queue(dev);
 383
 384     lance->RAP = CSR112;        /* Missed Frame Count */
 385     dev->stats.rx_missed_errors = swapw(lance->RDP);
 386     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 387
 388     if (ariadne_debug > 1) {
 389         printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
 390                dev->name, lance->RDP);
 391         printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
 392                dev->stats.rx_missed_errors);
 393     }
 394
 395     /* We stop the LANCE here -- it occasionally polls memory if we don't. */
 396     lance->RDP = STOP;
 397
 398     free_irq(IRQ_AMIGA_PORTS, dev);
 399
 400     return 0;
 401 }
 402
 403
 404 static inline void ariadne_reset(struct net_device *dev)
 405 {
 406     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 407
 408     lance->RAP = CSR0;  /* PCnet-ISA Controller Status */
 409     lance->RDP = STOP;
 410     ariadne_init_ring(dev);
 411     lance->RDP = INEA|STRT;
 412     netif_start_queue(dev);
 413 }
 414
 415
 416 static irqreturn_t ariadne_interrupt(int irq, void *data)
 417 {
 418     struct net_device *dev = (struct net_device *)data;
 419     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 420     struct ariadne_private *priv;
 421     int csr0, boguscnt;
 422     int handled = 0;
 423
 424     if (dev == NULL) {
 425         printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
 426         return IRQ_NONE;
 427     }
 428
 429     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 430
 431     if (!(lance->RDP & INTR))           /* Check if any interrupt has been */
 432         return IRQ_NONE;                /* generated by the board. */
 433
 434     priv = netdev_priv(dev);
 435
 436     boguscnt = 10;
 437     while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
 438         /* Acknowledge all of the current interrupt sources ASAP. */
 439         lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
 440
 441 #if 0
 442         if (ariadne_debug > 5) {
 443             printk(KERN_DEBUG "%s: interrupt  csr0=%#2.2x new csr=%#2.2x.",
 444                    dev->name, csr0, lance->RDP);
 445             printk("[");
 446             if (csr0 & INTR)
 447                 printk(" INTR");
 448             if (csr0 & INEA)
 449                 printk(" INEA");
 450             if (csr0 & RXON)
 451                 printk(" RXON");
 452             if (csr0 & TXON)
 453                 printk(" TXON");
 454             if (csr0 & TDMD)
 455                 printk(" TDMD");
 456             if (csr0 & STOP)
 457                 printk(" STOP");
 458             if (csr0 & STRT)
 459                 printk(" STRT");
 460             if (csr0 & INIT)
 461                 printk(" INIT");
 462             if (csr0 & ERR)
 463                 printk(" ERR");
 464             if (csr0 & BABL)
 465                 printk(" BABL");
 466             if (csr0 & CERR)
 467                 printk(" CERR");
 468             if (csr0 & MISS)
 469                 printk(" MISS");
 470             if (csr0 & MERR)
 471                 printk(" MERR");
 472             if (csr0 & RINT)
 473                 printk(" RINT");
 474             if (csr0 & TINT)
 475                 printk(" TINT");
 476             if (csr0 & IDON)
 477                 printk(" IDON");
 478             printk(" ]\n");
 479         }
 480 #endif
 481
 482         if (csr0 & RINT) {      /* Rx interrupt */
 483             handled = 1;
 484             ariadne_rx(dev);
 485         }
 486
 487         if (csr0 & TINT) {      /* Tx-done interrupt */
 488             int dirty_tx = priv->dirty_tx;
 489
 490             handled = 1;
 491             while (dirty_tx < priv->cur_tx) {
 492                 int entry = dirty_tx % TX_RING_SIZE;
 493                 int status = lowb(priv->tx_ring[entry]->TMD1);
 494
 495                 if (status & TF_OWN)
 496                     break;      /* It still hasn't been Txed */
 497
 498                 priv->tx_ring[entry]->TMD1 &= 0xff00;
 499
 500                 if (status & TF_ERR) {
 501                     /* There was an major error, log it. */
 502                     int err_status = priv->tx_ring[entry]->TMD3;
 503                     dev->stats.tx_errors++;
 504                     if (err_status & EF_RTRY)
 505                         dev->stats.tx_aborted_errors++;
 506                     if (err_status & EF_LCAR)
 507                         dev->stats.tx_carrier_errors++;
 508                     if (err_status & EF_LCOL)
 509                         dev->stats.tx_window_errors++;
 510                     if (err_status & EF_UFLO) {
 511                         /* Ackk!  On FIFO errors the Tx unit is turned off! */
 512                         dev->stats.tx_fifo_errors++;
 513                         /* Remove this verbosity later! */
 514                         printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
 515                                dev->name, csr0);
 516                         /* Restart the chip. */
 517                         lance->RDP = STRT;
 518                     }
 519                 } else {
 520                     if (status & (TF_MORE|TF_ONE))
 521                         dev->stats.collisions++;
 522                     dev->stats.tx_packets++;
 523                 }
 524                 dirty_tx++;
 525             }
 526
 527 #ifndef final_version
 528             if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
 529                 printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
 530                        "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
 531                 dirty_tx += TX_RING_SIZE;
 532             }
 533 #endif
 534
 535             if (priv->tx_full && netif_queue_stopped(dev) &&
 536                 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
 537                 /* The ring is no longer full. */
 538                 priv->tx_full = 0;
 539                 netif_wake_queue(dev);
 540             }
 541
 542             priv->dirty_tx = dirty_tx;
 543         }
 544
 545         /* Log misc errors. */
 546         if (csr0 & BABL) {
 547             handled = 1;
 548             dev->stats.tx_errors++;     /* Tx babble. */
 549         }
 550         if (csr0 & MISS) {
 551             handled = 1;
 552             dev->stats.rx_errors++;     /* Missed a Rx frame. */
 553         }
 554         if (csr0 & MERR) {
 555             handled = 1;
 556             printk(KERN_ERR "%s: Bus master arbitration failure, status "
 557                    "%4.4x.\n", dev->name, csr0);
 558             /* Restart the chip. */
 559             lance->RDP = STRT;
 560         }
 561     }
 562
 563     /* Clear any other interrupt, and set interrupt enable. */
 564     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 565     lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
 566
 567 #if 0
 568     if (ariadne_debug > 4)
 569         printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
 570                lance->RAP, lance->RDP);
 571 #endif
 572     return IRQ_RETVAL(handled);
 573 }
 574
 575
 576 static void ariadne_tx_timeout(struct net_device *dev)
 577 {
 578     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 579
 580     printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
 581            dev->name, lance->RDP);
 582     ariadne_reset(dev);
 583     netif_wake_queue(dev);
 584 }
 585
 586
 587 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
 588 {
 589     struct ariadne_private *priv = netdev_priv(dev);
 590     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 591     int entry;
 592     unsigned long flags;
 593     int len = skb->len;
 594
 595 #if 0
 596     if (ariadne_debug > 3) {
 597         lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
 598         printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
 599                dev->name, lance->RDP);
 600         lance->RDP = 0x0000;
 601     }
 602 #endif
 603
 604     /* FIXME: is the 79C960 new enough to do its own padding right ? */
 605     if (skb->len < ETH_ZLEN)
 606     {
 607         if (skb_padto(skb, ETH_ZLEN))
 608             return 0;
 609         len = ETH_ZLEN;
 610     }
 611
 612     /* Fill in a Tx ring entry */
 613
 614 #if 0
 615 {
 616     DECLARE_MAC_BUF(mac);
 617     DECLARE_MAC_BUF(mac2);
 618
 619     printk(KERN_DEBUG "TX pkt type 0x%04x from %s to %s "
 620            " data 0x%08x len %d\n",
 621            ((u_short *)skb->data)[6],
 622            print_mac(mac, ((const u8 *)skb->data)+6),
 623            print_mac(mac, (const u8 *)skb->data),
 624            (int)skb->data, (int)skb->len);
 625 }
 626 #endif
 627
 628     local_irq_save(flags);
 629
 630     entry = priv->cur_tx % TX_RING_SIZE;
 631
 632     /* Caution: the write order is important here, set the base address with
 633                 the "ownership" bits last. */
 634
 635     priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
 636     priv->tx_ring[entry]->TMD3 = 0x0000;
 637     memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
 638
 639 #if 0
 640     {
 641         int i, len;
 642
 643         len = skb->len > 64 ? 64 : skb->len;
 644         len >>= 1;
 645         for (i = 0; i < len; i += 8) {
 646             int j;
 647             printk(KERN_DEBUG "%04x:", i);
 648             for (j = 0; (j < 8) && ((i+j) < len); j++) {
 649                 if (!(j & 1))
 650                     printk(" ");
 651                 printk("%04x", priv->tx_buff[entry][i+j]);
 652             }
 653             printk("\n");
 654         }
 655     }
 656 #endif
 657
 658     priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
 659
 660     dev_kfree_skb(skb);
 661
 662     priv->cur_tx++;
 663     if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
 664
 665 #if 0
 666         printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
 667                "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
 668 #endif
 669
 670         priv->cur_tx -= TX_RING_SIZE;
 671         priv->dirty_tx -= TX_RING_SIZE;
 672     }
 673     dev->stats.tx_bytes += len;
 674
 675     /* Trigger an immediate send poll. */
 676     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 677     lance->RDP = INEA|TDMD;
 678
 679     dev->trans_start = jiffies;
 680
 681     if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
 682         netif_stop_queue(dev);
 683         priv->tx_full = 1;
 684     }
 685     local_irq_restore(flags);
 686
 687     return 0;
 688 }
 689
 690
 691 static int ariadne_rx(struct net_device *dev)
 692 {
 693     struct ariadne_private *priv = netdev_priv(dev);
 694     int entry = priv->cur_rx % RX_RING_SIZE;
 695     int i;
 696
 697     /* If we own the next entry, it's a new packet. Send it up. */
 698     while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
 699         int status = lowb(priv->rx_ring[entry]->RMD1);
 700
 701         if (status != (RF_STP|RF_ENP)) {        /* There was an error. */
 702             /* There is a tricky error noted by John Murphy,
 703                 <murf@perftech.com> to Russ Nelson: Even with full-sized
 704                 buffers it's possible for a jabber packet to use two
 705                 buffers, with only the last correctly noting the error. */
 706             if (status & RF_ENP)
 707                 /* Only count a general error at the end of a packet.*/
 708                 dev->stats.rx_errors++;
 709             if (status & RF_FRAM)
 710                 dev->stats.rx_frame_errors++;
 711             if (status & RF_OFLO)
 712                 dev->stats.rx_over_errors++;
 713             if (status & RF_CRC)
 714                 dev->stats.rx_crc_errors++;
 715             if (status & RF_BUFF)
 716                 dev->stats.rx_fifo_errors++;
 717             priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
 718         } else {
 719             /* Malloc up new buffer, compatible with net-3. */
 720             short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
 721             struct sk_buff *skb;
 722
 723             skb = dev_alloc_skb(pkt_len+2);
 724             if (skb == NULL) {
 725                 printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
 726                        dev->name);
 727                 for (i = 0; i < RX_RING_SIZE; i++)
 728                     if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
 729                         break;
 730
 731                 if (i > RX_RING_SIZE-2) {
 732                     dev->stats.rx_dropped++;
 733                     priv->rx_ring[entry]->RMD1 |= RF_OWN;
 734                     priv->cur_rx++;
 735                 }
 736                 break;
 737             }
 738
 739
 740             skb_reserve(skb,2);         /* 16 byte align */
 741             skb_put(skb,pkt_len);       /* Make room */
 742             skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
 743             skb->protocol=eth_type_trans(skb,dev);
 744 #if 0
 745 {
 746             DECLARE_MAC_BUF(mac);
 747
 748             printk(KERN_DEBUG "RX pkt type 0x%04x from ",
 749                    ((u_short *)skb->data)[6]);
 750             {
 751                 u_char *ptr = &((u_char *)skb->data)[6];
 752                 printk("%s", print_mac(mac, ptr));
 753             }
 754             printk(" to ");
 755             {
 756                 u_char *ptr = (u_char *)skb->data;
 757                 printk("%s", print_mac(mac, ptr));
 758             }
 759             printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 760 }
 761 #endif
 762
 763             netif_rx(skb);
 764             dev->last_rx = jiffies;
 765             dev->stats.rx_packets++;
 766             dev->stats.rx_bytes += pkt_len;
 767         }
 768
 769         priv->rx_ring[entry]->RMD1 |= RF_OWN;
 770         entry = (++priv->cur_rx) % RX_RING_SIZE;
 771     }
 772
 773     priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
 774
 775     /* We should check that at least two ring entries are free.  If not,
 776        we should free one and mark stats->rx_dropped++. */
 777
 778     return 0;
 779 }
 780
 781
 782 static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
 783 {
 784     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 785     short saved_addr;
 786     unsigned long flags;
 787
 788     local_irq_save(flags);
 789     saved_addr = lance->RAP;
 790     lance->RAP = CSR112;                /* Missed Frame Count */
 791     dev->stats.rx_missed_errors = swapw(lance->RDP);
 792     lance->RAP = saved_addr;
 793     local_irq_restore(flags);
 794
 795     return &dev->stats;
 796 }
 797
 798
 799 /* Set or clear the multicast filter for this adaptor.
 800     num_addrs == -1     Promiscuous mode, receive all packets
 801     num_addrs == 0      Normal mode, clear multicast list
 802     num_addrs > 0       Multicast mode, receive normal and MC packets, and do
 803                         best-effort filtering.
 804  */
 805 static void set_multicast_list(struct net_device *dev)
 806 {
 807     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 808
 809     if (!netif_running(dev))
 810         return;
 811
 812     netif_stop_queue(dev);
 813
 814     /* We take the simple way out and always enable promiscuous mode. */
 815     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 816     lance->RDP = STOP;                  /* Temporarily stop the lance. */
 817     ariadne_init_ring(dev);
 818
 819     if (dev->flags & IFF_PROMISC) {
 820         lance->RAP = CSR15;             /* Mode Register */
 821         lance->RDP = PROM;              /* Set promiscuous mode */
 822     } else {
 823         short multicast_table[4];
 824         int num_addrs = dev->mc_count;
 825         int i;
 826         /* We don't use the multicast table, but rely on upper-layer filtering. */
 827         memset(multicast_table, (num_addrs == 0) ? 0 : -1,
 828                sizeof(multicast_table));
 829         for (i = 0; i < 4; i++) {
 830             lance->RAP = CSR8+(i<<8);   /* Logical Address Filter */
 831             lance->RDP = swapw(multicast_table[i]);
 832         }
 833         lance->RAP = CSR15;             /* Mode Register */
 834         lance->RDP = 0x0000;            /* Unset promiscuous mode */
 835     }
 836
 837     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 838     lance->RDP = INEA|STRT|IDON;        /* Resume normal operation. */
 839
 840     netif_wake_queue(dev);
 841 }
 842
 843
 844 static void __devexit ariadne_remove_one(struct zorro_dev *z)
 845 {
 846     struct net_device *dev = zorro_get_drvdata(z);
 847
 848     unregister_netdev(dev);
 849     release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
 850     release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
 851     free_netdev(dev);
 852 }
 853
 854 static int __init ariadne_init_module(void)
 855 {
 856     return zorro_register_driver(&ariadne_driver);
 857 }
 858
 859 static void __exit ariadne_cleanup_module(void)
 860 {
 861     zorro_unregister_driver(&ariadne_driver);
 862 }
 863
 864 module_init(ariadne_init_module);
 865 module_exit(ariadne_cleanup_module);
 866
 867 MODULE_LICENSE("GPL");