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