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     struct net_device_stats stats;
 102     char tx_full;
 103 };
 104
 105
 106     /*
 107      *  Structure Created in the Ariadne's RAM Buffer
 108      */
 109
 110 struct lancedata {
 111     struct TDRE tx_ring[TX_RING_SIZE];
 112     struct RDRE rx_ring[RX_RING_SIZE];
 113     u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 114     u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 115 };
 116
 117 static int ariadne_open(struct net_device *dev);
 118 static void ariadne_init_ring(struct net_device *dev);
 119 static int ariadne_start_xmit(struct sk_buff *skb, 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 int __devinit ariadne_init_one(struct zorro_dev *z,
 160                                       const struct zorro_device_id *ent)
 161 {
 162     unsigned long board = z->resource.start;
 163     unsigned long base_addr = board+ARIADNE_LANCE;
 164     unsigned long mem_start = board+ARIADNE_RAM;
 165     struct resource *r1, *r2;
 166     struct net_device *dev;
 167     struct ariadne_private *priv;
 168     int err;
 169
 170     r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
 171     if (!r1)
 172         return -EBUSY;
 173     r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
 174     if (!r2) {
 175         release_resource(r1);
 176         return -EBUSY;
 177     }
 178
 179     dev = alloc_etherdev(sizeof(struct ariadne_private));
 180     if (dev == NULL) {
 181         release_resource(r1);
 182         release_resource(r2);
 183         return -ENOMEM;
 184     }
 185
 186     SET_MODULE_OWNER(dev);
 187     priv = netdev_priv(dev);
 188
 189     r1->name = dev->name;
 190     r2->name = dev->name;
 191
 192     dev->dev_addr[0] = 0x00;
 193     dev->dev_addr[1] = 0x60;
 194     dev->dev_addr[2] = 0x30;
 195     dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
 196     dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
 197     dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
 198     dev->base_addr = ZTWO_VADDR(base_addr);
 199     dev->mem_start = ZTWO_VADDR(mem_start);
 200     dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
 201
 202     dev->open = &ariadne_open;
 203     dev->stop = &ariadne_close;
 204     dev->hard_start_xmit = &ariadne_start_xmit;
 205     dev->tx_timeout = &ariadne_tx_timeout;
 206     dev->watchdog_timeo = 5*HZ;
 207     dev->get_stats = &ariadne_get_stats;
 208     dev->set_multicast_list = &set_multicast_list;
 209
 210     err = register_netdev(dev);
 211     if (err) {
 212         release_resource(r1);
 213         release_resource(r2);
 214         free_netdev(dev);
 215         return err;
 216     }
 217     zorro_set_drvdata(z, dev);
 218
 219     printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address "
 220            "%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board,
 221            dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
 222            dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
 223
 224     return 0;
 225 }
 226
 227
 228 static int ariadne_open(struct net_device *dev)
 229 {
 230     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 231     u_short in;
 232     u_long version;
 233     int i;
 234
 235     /* Reset the LANCE */
 236     in = lance->Reset;
 237
 238     /* Stop the LANCE */
 239     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 240     lance->RDP = STOP;
 241
 242     /* Check the LANCE version */
 243     lance->RAP = CSR88;         /* Chip ID */
 244     version = swapw(lance->RDP);
 245     lance->RAP = CSR89;         /* Chip ID */
 246     version |= swapw(lance->RDP)<<16;
 247     if ((version & 0x00000fff) != 0x00000003) {
 248         printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
 249         return -EAGAIN;
 250     }
 251     if ((version & 0x0ffff000) != 0x00003000) {
 252         printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
 253                "number = %ld)\n", (version & 0x0ffff000)>>12);
 254         return -EAGAIN;
 255     }
 256 #if 0
 257     printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
 258            (version & 0xf0000000)>>28);
 259 #endif
 260
 261     ariadne_init_ring(dev);
 262
 263     /* Miscellaneous Stuff */
 264     lance->RAP = CSR3;          /* Interrupt Masks and Deferral Control */
 265     lance->RDP = 0x0000;
 266     lance->RAP = CSR4;          /* Test and Features Control */
 267     lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
 268
 269     /* Set the Multicast Table */
 270     lance->RAP = CSR8;          /* Logical Address Filter, LADRF[15:0] */
 271     lance->RDP = 0x0000;
 272     lance->RAP = CSR9;          /* Logical Address Filter, LADRF[31:16] */
 273     lance->RDP = 0x0000;
 274     lance->RAP = CSR10;         /* Logical Address Filter, LADRF[47:32] */
 275     lance->RDP = 0x0000;
 276     lance->RAP = CSR11;         /* Logical Address Filter, LADRF[63:48] */
 277     lance->RDP = 0x0000;
 278
 279     /* Set the Ethernet Hardware Address */
 280     lance->RAP = CSR12;         /* Physical Address Register, PADR[15:0] */
 281     lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
 282     lance->RAP = CSR13;         /* Physical Address Register, PADR[31:16] */
 283     lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
 284     lance->RAP = CSR14;         /* Physical Address Register, PADR[47:32] */
 285     lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
 286
 287     /* Set the Init Block Mode */
 288     lance->RAP = CSR15;         /* Mode Register */
 289     lance->RDP = 0x0000;
 290
 291     /* Set the Transmit Descriptor Ring Pointer */
 292     lance->RAP = CSR30;         /* Base Address of Transmit Ring */
 293     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 294     lance->RAP = CSR31;         /* Base Address of transmit Ring */
 295     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 296
 297     /* Set the Receive Descriptor Ring Pointer */
 298     lance->RAP = CSR24;         /* Base Address of Receive Ring */
 299     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 300     lance->RAP = CSR25;         /* Base Address of Receive Ring */
 301     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 302
 303     /* Set the Number of RX and TX Ring Entries */
 304     lance->RAP = CSR76;         /* Receive Ring Length */
 305     lance->RDP = swapw(((u_short)-RX_RING_SIZE));
 306     lance->RAP = CSR78;         /* Transmit Ring Length */
 307     lance->RDP = swapw(((u_short)-TX_RING_SIZE));
 308
 309     /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
 310     lance->RAP = ISACSR2;       /* Miscellaneous Configuration */
 311     lance->IDP = ASEL;
 312
 313     /* LED Control */
 314     lance->RAP = ISACSR5;       /* LED1 Status */
 315     lance->IDP = PSE|XMTE;
 316     lance->RAP = ISACSR6;       /* LED2 Status */
 317     lance->IDP = PSE|COLE;
 318     lance->RAP = ISACSR7;       /* LED3 Status */
 319     lance->IDP = PSE|RCVE;
 320
 321     netif_start_queue(dev);
 322
 323     i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, IRQF_SHARED,
 324                     dev->name, dev);
 325     if (i) return i;
 326
 327     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 328     lance->RDP = INEA|STRT;
 329
 330     return 0;
 331 }
 332
 333
 334 static void ariadne_init_ring(struct net_device *dev)
 335 {
 336     struct ariadne_private *priv = netdev_priv(dev);
 337     volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
 338     int i;
 339
 340     netif_stop_queue(dev);
 341
 342     priv->tx_full = 0;
 343     priv->cur_rx = priv->cur_tx = 0;
 344     priv->dirty_tx = 0;
 345
 346     /* Set up TX Ring */
 347     for (i = 0; i < TX_RING_SIZE; i++) {
 348         volatile struct TDRE *t = &lancedata->tx_ring[i];
 349         t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
 350         t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
 351                   TF_STP | TF_ENP;
 352         t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
 353         t->TMD3 = 0;
 354         priv->tx_ring[i] = &lancedata->tx_ring[i];
 355         priv->tx_buff[i] = lancedata->tx_buff[i];
 356 #if 0
 357         printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
 358                &lancedata->tx_ring[i], lancedata->tx_buff[i]);
 359 #endif
 360     }
 361
 362     /* Set up RX Ring */
 363     for (i = 0; i < RX_RING_SIZE; i++) {
 364         volatile struct RDRE *r = &lancedata->rx_ring[i];
 365         r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
 366         r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
 367                   RF_OWN;
 368         r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
 369         r->RMD3 = 0x0000;
 370         priv->rx_ring[i] = &lancedata->rx_ring[i];
 371         priv->rx_buff[i] = lancedata->rx_buff[i];
 372 #if 0
 373         printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
 374                &lancedata->rx_ring[i], lancedata->rx_buff[i]);
 375 #endif
 376     }
 377 }
 378
 379
 380 static int ariadne_close(struct net_device *dev)
 381 {
 382     struct ariadne_private *priv = netdev_priv(dev);
 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     priv->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                priv->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                     priv->stats.tx_errors++;
 507                     if (err_status & EF_RTRY)
 508                         priv->stats.tx_aborted_errors++;
 509                     if (err_status & EF_LCAR)
 510                         priv->stats.tx_carrier_errors++;
 511                     if (err_status & EF_LCOL)
 512                         priv->stats.tx_window_errors++;
 513                     if (err_status & EF_UFLO) {
 514                         /* Ackk!  On FIFO errors the Tx unit is turned off! */
 515                         priv->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                         priv->stats.collisions++;
 525                     priv->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             priv->stats.tx_errors++;    /* Tx babble. */
 552         }
 553         if (csr0 & MISS) {
 554             handled = 1;
 555             priv->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 int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
 591 {
 592     struct ariadne_private *priv = netdev_priv(dev);
 593     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 594     int entry;
 595     unsigned long flags;
 596     int len = skb->len;
 597
 598 #if 0
 599     if (ariadne_debug > 3) {
 600         lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
 601         printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
 602                dev->name, lance->RDP);
 603         lance->RDP = 0x0000;
 604     }
 605 #endif
 606
 607     /* FIXME: is the 79C960 new enough to do its own padding right ? */
 608     if (skb->len < ETH_ZLEN)
 609     {
 610         if (skb_padto(skb, ETH_ZLEN))
 611             return 0;
 612         len = ETH_ZLEN;
 613     }
 614
 615     /* Fill in a Tx ring entry */
 616
 617 #if 0
 618     printk(KERN_DEBUG "TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
 619     {
 620         int i;
 621         u_char *ptr = &((u_char *)skb->data)[6];
 622         for (i = 0; i < 6; i++)
 623             printk("%02x", ptr[i]);
 624     }
 625     printk(" to ");
 626     {
 627         int i;
 628         u_char *ptr = (u_char *)skb->data;
 629         for (i = 0; i < 6; i++)
 630             printk("%02x", ptr[i]);
 631     }
 632     printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 633 #endif
 634
 635     local_irq_save(flags);
 636
 637     entry = priv->cur_tx % TX_RING_SIZE;
 638
 639     /* Caution: the write order is important here, set the base address with
 640                 the "ownership" bits last. */
 641
 642     priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
 643     priv->tx_ring[entry]->TMD3 = 0x0000;
 644     memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
 645
 646 #if 0
 647     {
 648         int i, len;
 649
 650         len = skb->len > 64 ? 64 : skb->len;
 651         len >>= 1;
 652         for (i = 0; i < len; i += 8) {
 653             int j;
 654             printk(KERN_DEBUG "%04x:", i);
 655             for (j = 0; (j < 8) && ((i+j) < len); j++) {
 656                 if (!(j & 1))
 657                     printk(" ");
 658                 printk("%04x", priv->tx_buff[entry][i+j]);
 659             }
 660             printk("\n");
 661         }
 662     }
 663 #endif
 664
 665     priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
 666
 667     dev_kfree_skb(skb);
 668
 669     priv->cur_tx++;
 670     if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
 671
 672 #if 0
 673         printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
 674                "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
 675 #endif
 676
 677         priv->cur_tx -= TX_RING_SIZE;
 678         priv->dirty_tx -= TX_RING_SIZE;
 679     }
 680     priv->stats.tx_bytes += len;
 681
 682     /* Trigger an immediate send poll. */
 683     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 684     lance->RDP = INEA|TDMD;
 685
 686     dev->trans_start = jiffies;
 687
 688     if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
 689         netif_stop_queue(dev);
 690         priv->tx_full = 1;
 691     }
 692     local_irq_restore(flags);
 693
 694     return 0;
 695 }
 696
 697
 698 static int ariadne_rx(struct net_device *dev)
 699 {
 700     struct ariadne_private *priv = netdev_priv(dev);
 701     int entry = priv->cur_rx % RX_RING_SIZE;
 702     int i;
 703
 704     /* If we own the next entry, it's a new packet. Send it up. */
 705     while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
 706         int status = lowb(priv->rx_ring[entry]->RMD1);
 707
 708         if (status != (RF_STP|RF_ENP)) {        /* There was an error. */
 709             /* There is a tricky error noted by John Murphy,
 710                 <murf@perftech.com> to Russ Nelson: Even with full-sized
 711                 buffers it's possible for a jabber packet to use two
 712                 buffers, with only the last correctly noting the error. */
 713             if (status & RF_ENP)
 714                 /* Only count a general error at the end of a packet.*/
 715                 priv->stats.rx_errors++;
 716             if (status & RF_FRAM)
 717                 priv->stats.rx_frame_errors++;
 718             if (status & RF_OFLO)
 719                 priv->stats.rx_over_errors++;
 720             if (status & RF_CRC)
 721                 priv->stats.rx_crc_errors++;
 722             if (status & RF_BUFF)
 723                 priv->stats.rx_fifo_errors++;
 724             priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
 725         } else {
 726             /* Malloc up new buffer, compatible with net-3. */
 727             short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
 728             struct sk_buff *skb;
 729
 730             skb = dev_alloc_skb(pkt_len+2);
 731             if (skb == NULL) {
 732                 printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
 733                        dev->name);
 734                 for (i = 0; i < RX_RING_SIZE; i++)
 735                     if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
 736                         break;
 737
 738                 if (i > RX_RING_SIZE-2) {
 739                     priv->stats.rx_dropped++;
 740                     priv->rx_ring[entry]->RMD1 |= RF_OWN;
 741                     priv->cur_rx++;
 742                 }
 743                 break;
 744             }
 745
 746
 747             skb_reserve(skb,2);         /* 16 byte align */
 748             skb_put(skb,pkt_len);       /* Make room */
 749             skb_copy_to_linear_data(skb, (char *)priv->rx_buff[entry], pkt_len);
 750             skb->protocol=eth_type_trans(skb,dev);
 751 #if 0
 752             printk(KERN_DEBUG "RX pkt type 0x%04x from ",
 753                    ((u_short *)skb->data)[6]);
 754             {
 755                 int i;
 756                 u_char *ptr = &((u_char *)skb->data)[6];
 757                 for (i = 0; i < 6; i++)
 758                     printk("%02x", ptr[i]);
 759             }
 760             printk(" to ");
 761             {
 762                 int i;
 763                 u_char *ptr = (u_char *)skb->data;
 764                 for (i = 0; i < 6; i++)
 765                     printk("%02x", ptr[i]);
 766             }
 767             printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 768 #endif
 769
 770             netif_rx(skb);
 771             dev->last_rx = jiffies;
 772             priv->stats.rx_packets++;
 773             priv->stats.rx_bytes += pkt_len;
 774         }
 775
 776         priv->rx_ring[entry]->RMD1 |= RF_OWN;
 777         entry = (++priv->cur_rx) % RX_RING_SIZE;
 778     }
 779
 780     priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
 781
 782     /* We should check that at least two ring entries are free.  If not,
 783        we should free one and mark stats->rx_dropped++. */
 784
 785     return 0;
 786 }
 787
 788
 789 static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
 790 {
 791     struct ariadne_private *priv = netdev_priv(dev);
 792     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 793     short saved_addr;
 794     unsigned long flags;
 795
 796     local_irq_save(flags);
 797     saved_addr = lance->RAP;
 798     lance->RAP = CSR112;                /* Missed Frame Count */
 799     priv->stats.rx_missed_errors = swapw(lance->RDP);
 800     lance->RAP = saved_addr;
 801     local_irq_restore(flags);
 802
 803     return &priv->stats;
 804 }
 805
 806
 807 /* Set or clear the multicast filter for this adaptor.
 808     num_addrs == -1     Promiscuous mode, receive all packets
 809     num_addrs == 0      Normal mode, clear multicast list
 810     num_addrs > 0       Multicast mode, receive normal and MC packets, and do
 811                         best-effort filtering.
 812  */
 813 static void set_multicast_list(struct net_device *dev)
 814 {
 815     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 816
 817     if (!netif_running(dev))
 818         return;
 819
 820     netif_stop_queue(dev);
 821
 822     /* We take the simple way out and always enable promiscuous mode. */
 823     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 824     lance->RDP = STOP;                  /* Temporarily stop the lance. */
 825     ariadne_init_ring(dev);
 826
 827     if (dev->flags & IFF_PROMISC) {
 828         lance->RAP = CSR15;             /* Mode Register */
 829         lance->RDP = PROM;              /* Set promiscuous mode */
 830     } else {
 831         short multicast_table[4];
 832         int num_addrs = dev->mc_count;
 833         int i;
 834         /* We don't use the multicast table, but rely on upper-layer filtering. */
 835         memset(multicast_table, (num_addrs == 0) ? 0 : -1,
 836                sizeof(multicast_table));
 837         for (i = 0; i < 4; i++) {
 838             lance->RAP = CSR8+(i<<8);   /* Logical Address Filter */
 839             lance->RDP = swapw(multicast_table[i]);
 840         }
 841         lance->RAP = CSR15;             /* Mode Register */
 842         lance->RDP = 0x0000;            /* Unset promiscuous mode */
 843     }
 844
 845     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 846     lance->RDP = INEA|STRT|IDON;        /* Resume normal operation. */
 847
 848     netif_wake_queue(dev);
 849 }
 850
 851
 852 static void __devexit ariadne_remove_one(struct zorro_dev *z)
 853 {
 854     struct net_device *dev = zorro_get_drvdata(z);
 855
 856     unregister_netdev(dev);
 857     release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
 858     release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
 859     free_netdev(dev);
 860 }
 861
 862 static int __init ariadne_init_module(void)
 863 {
 864     return zorro_register_driver(&ariadne_driver);
 865 }
 866
 867 static void __exit ariadne_cleanup_module(void)
 868 {
 869     zorro_unregister_driver(&ariadne_driver);
 870 }
 871
 872 module_init(ariadne_init_module);
 873 module_exit(ariadne_cleanup_module);
 874
 875 MODULE_LICENSE("GPL");