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