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