drivers/net/ariadne.c

   1 /*
   2  *  Amiga Linux/m68k Ariadne Ethernet Driver
   3  *
   4  *  © Copyright 1995 by Geert Uytterhoeven (geert@linux-m68k.org)
   5  *                      Peter De Schrijver
   6  *                     (Peter.DeSchrijver@linux.cc.kuleuven.ac.be)
   7  *
   8  *  ---------------------------------------------------------------------------
   9  *
  10  *  This program is based on
  11  *
  12  *      lance.c:        An AMD LANCE ethernet driver for linux.
  13  *                      Written 1993-94 by Donald Becker.
  14  *
  15  *      Am79C960:       PCnet(tm)-ISA Single-Chip Ethernet Controller
  16  *                      Advanced Micro Devices
  17  *                      Publication #16907, Rev. B, Amendment/0, May 1994
  18  *
  19  *      MC68230:        Parallel Interface/Timer (PI/T)
  20  *                      Motorola Semiconductors, December, 1983
  21  *
  22  *  ---------------------------------------------------------------------------
  23  *
  24  *  This file is subject to the terms and conditions of the GNU General Public
  25  *  License.  See the file COPYING in the main directory of the Linux
  26  *  distribution for more details.
  27  *
  28  *  ---------------------------------------------------------------------------
  29  *
  30  *  The Ariadne is a Zorro-II board made by Village Tronic. It contains:
  31  *
  32  *      - an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
  33  *        10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
  34  *
  35  *      - an MC68230 Parallel Interface/Timer configured as 2 parallel ports
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/stddef.h>
  40 #include <linux/kernel.h>
  41 #include <linux/string.h>
  42 #include <linux/errno.h>
  43 #include <linux/ioport.h>
  44 #include <linux/slab.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/etherdevice.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/skbuff.h>
  49 #include <linux/init.h>
  50 #include <linux/zorro.h>
  51
  52 #include <asm/bitops.h>
  53 #include <asm/amigaints.h>
  54 #include <asm/amigahw.h>
  55 #include <asm/irq.h>
  56
  57 #include "ariadne.h"
  58
  59
  60 #ifdef ARIADNE_DEBUG
  61 int ariadne_debug = ARIADNE_DEBUG;
  62 #else
  63 int ariadne_debug = 1;
  64 #endif
  65
  66
  67     /*
  68      *  Macros to Fix Endianness problems
  69      */
  70
  71                                 /* Swap the Bytes in a WORD */
  72 #define swapw(x)        (((x>>8)&0x00ff)|((x<<8)&0xff00))
  73                                 /* Get the Low BYTE in a WORD */
  74 #define lowb(x)         (x&0xff)
  75                                 /* Get the Swapped High WORD in a LONG */
  76 #define swhighw(x)      ((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
  77                                 /* Get the Swapped Low WORD in a LONG */
  78 #define swloww(x)       ((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
  79
  80
  81     /*
  82      *  Transmit/Receive Ring Definitions
  83      */
  84
  85 #define TX_RING_SIZE    5
  86 #define RX_RING_SIZE    16
  87
  88 #define PKT_BUF_SIZE    1520
  89
  90
  91     /*
  92      *  Private Device Data
  93      */
  94
  95 struct ariadne_private {
  96     volatile struct TDRE *tx_ring[TX_RING_SIZE];
  97     volatile struct RDRE *rx_ring[RX_RING_SIZE];
  98     volatile u_short *tx_buff[TX_RING_SIZE];
  99     volatile u_short *rx_buff[RX_RING_SIZE];
 100     int cur_tx, cur_rx;                 /* The next free ring entry */
 101     int dirty_tx;                       /* The ring entries to be free()ed. */
 102     struct net_device_stats stats;
 103     char tx_full;
 104     struct net_device *dev;             /* Backpointer */
 105     struct ariadne_private *next_module;
 106 };
 107
 108
 109     /*
 110      *  Structure Created in the Ariadne's RAM Buffer
 111      */
 112
 113 struct lancedata {
 114     struct TDRE tx_ring[TX_RING_SIZE];
 115     struct RDRE rx_ring[RX_RING_SIZE];
 116     u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 117     u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
 118 };
 119
 120 #ifdef MODULE
 121 static struct ariadne_private *root_ariadne_dev;
 122 #endif
 123
 124 static int ariadne_open(struct net_device *dev);
 125 static void ariadne_init_ring(struct net_device *dev);
 126 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
 127 static void ariadne_tx_timeout(struct net_device *dev);
 128 static int ariadne_rx(struct net_device *dev);
 129 static void ariadne_reset(struct net_device *dev);
 130 static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp);
 131 static int ariadne_close(struct net_device *dev);
 132 static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
 133 #ifdef HAVE_MULTICAST
 134 static void set_multicast_list(struct net_device *dev);
 135 #endif
 136
 137
 138 static void memcpyw(volatile u_short *dest, u_short *src, int len)
 139 {
 140     while (len >= 2) {
 141         *(dest++) = *(src++);
 142         len -= 2;
 143     }
 144     if (len == 1)
 145         *dest = (*(u_char *)src)<<8;
 146 }
 147
 148
 149 static int __init ariadne_probe(void)
 150 {
 151     struct zorro_dev *z = NULL;
 152     struct net_device *dev;
 153     struct ariadne_private *priv;
 154     int res = -ENODEV;
 155
 156     while ((z = zorro_find_device(ZORRO_PROD_VILLAGE_TRONIC_ARIADNE, z))) {
 157         unsigned long board = z->resource.start;
 158         unsigned long base_addr = board+ARIADNE_LANCE;
 159         unsigned long mem_start = board+ARIADNE_RAM;
 160         struct resource *r1, *r2;
 161
 162         r1 = request_mem_region(base_addr, sizeof(struct Am79C960),
 163                                 "Am79C960");
 164         if (!r1) continue;
 165         r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
 166         if (!r2) {
 167             release_resource(r1);
 168             continue;
 169         }
 170
 171         dev = init_etherdev(NULL, sizeof(struct ariadne_private));
 172
 173         if (dev == NULL) {
 174             release_resource(r1);
 175             release_resource(r2);
 176             return -ENOMEM;
 177         }
 178         SET_MODULE_OWNER(dev);
 179         priv = dev->priv;
 180
 181         r1->name = dev->name;
 182         r2->name = dev->name;
 183
 184         priv->dev = dev;
 185         dev->dev_addr[0] = 0x00;
 186         dev->dev_addr[1] = 0x60;
 187         dev->dev_addr[2] = 0x30;
 188         dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
 189         dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
 190         dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
 191         printk("%s: Ariadne at 0x%08lx, Ethernet Address "
 192                "%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board,
 193                dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
 194                dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
 195
 196         dev->base_addr = ZTWO_VADDR(base_addr);
 197         dev->mem_start = ZTWO_VADDR(mem_start);
 198         dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
 199
 200         dev->open = &ariadne_open;
 201         dev->stop = &ariadne_close;
 202         dev->hard_start_xmit = &ariadne_start_xmit;
 203         dev->tx_timeout = &ariadne_tx_timeout;
 204         dev->watchdog_timeo = 5*HZ;
 205         dev->get_stats = &ariadne_get_stats;
 206         dev->set_multicast_list = &set_multicast_list;
 207
 208 #ifdef MODULE
 209         priv->next_module = root_ariadne_dev;
 210         root_ariadne_dev = priv;
 211 #endif
 212         res = 0;
 213     }
 214     return res;
 215 }
 216
 217
 218 static int ariadne_open(struct net_device *dev)
 219 {
 220     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 221     u_short in;
 222     u_long version;
 223     int i;
 224
 225     /* Reset the LANCE */
 226     in = lance->Reset;
 227
 228     /* Stop the LANCE */
 229     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 230     lance->RDP = STOP;
 231
 232     /* Check the LANCE version */
 233     lance->RAP = CSR88;         /* Chip ID */
 234     version = swapw(lance->RDP);
 235     lance->RAP = CSR89;         /* Chip ID */
 236     version |= swapw(lance->RDP)<<16;
 237     if ((version & 0x00000fff) != 0x00000003) {
 238         printk("ariadne_open: Couldn't find AMD Ethernet Chip\n");
 239         return -EAGAIN;
 240     }
 241     if ((version & 0x0ffff000) != 0x00003000) {
 242         printk("ariadne_open: Couldn't find Am79C960 (Wrong part number = %ld)\n",
 243                (version & 0x0ffff000)>>12);
 244         return -EAGAIN;
 245     }
 246 #if 0
 247     printk("ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
 248            (version & 0xf0000000)>>28);
 249 #endif
 250
 251     ariadne_init_ring(dev);
 252
 253     /* Miscellaneous Stuff */
 254     lance->RAP = CSR3;          /* Interrupt Masks and Deferral Control */
 255     lance->RDP = 0x0000;
 256     lance->RAP = CSR4;          /* Test and Features Control */
 257     lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
 258
 259     /* Set the Multicast Table */
 260     lance->RAP = CSR8;          /* Logical Address Filter, LADRF[15:0] */
 261     lance->RDP = 0x0000;
 262     lance->RAP = CSR9;          /* Logical Address Filter, LADRF[31:16] */
 263     lance->RDP = 0x0000;
 264     lance->RAP = CSR10;         /* Logical Address Filter, LADRF[47:32] */
 265     lance->RDP = 0x0000;
 266     lance->RAP = CSR11;         /* Logical Address Filter, LADRF[63:48] */
 267     lance->RDP = 0x0000;
 268
 269     /* Set the Ethernet Hardware Address */
 270     lance->RAP = CSR12;         /* Physical Address Register, PADR[15:0] */
 271     lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
 272     lance->RAP = CSR13;         /* Physical Address Register, PADR[31:16] */
 273     lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
 274     lance->RAP = CSR14;         /* Physical Address Register, PADR[47:32] */
 275     lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
 276
 277     /* Set the Init Block Mode */
 278     lance->RAP = CSR15;         /* Mode Register */
 279     lance->RDP = 0x0000;
 280
 281     /* Set the Transmit Descriptor Ring Pointer */
 282     lance->RAP = CSR30;         /* Base Address of Transmit Ring */
 283     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 284     lance->RAP = CSR31;         /* Base Address of transmit Ring */
 285     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
 286
 287     /* Set the Receive Descriptor Ring Pointer */
 288     lance->RAP = CSR24;         /* Base Address of Receive Ring */
 289     lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 290     lance->RAP = CSR25;         /* Base Address of Receive Ring */
 291     lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
 292
 293     /* Set the Number of RX and TX Ring Entries */
 294     lance->RAP = CSR76;         /* Receive Ring Length */
 295     lance->RDP = swapw(((u_short)-RX_RING_SIZE));
 296     lance->RAP = CSR78;         /* Transmit Ring Length */
 297     lance->RDP = swapw(((u_short)-TX_RING_SIZE));
 298
 299     /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
 300     lance->RAP = ISACSR2;       /* Miscellaneous Configuration */
 301     lance->IDP = ASEL;
 302
 303     /* LED Control */
 304     lance->RAP = ISACSR5;       /* LED1 Status */
 305     lance->IDP = PSE|XMTE;
 306     lance->RAP = ISACSR6;       /* LED2 Status */
 307     lance->IDP = PSE|COLE;
 308     lance->RAP = ISACSR7;       /* LED3 Status */
 309     lance->IDP = PSE|RCVE;
 310
 311     netif_start_queue(dev);
 312
 313     i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, SA_SHIRQ,
 314                     dev->name, dev);
 315     if (i) return i;
 316
 317     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 318     lance->RDP = INEA|STRT;
 319
 320     return 0;
 321 }
 322
 323
 324 static void ariadne_init_ring(struct net_device *dev)
 325 {
 326     struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
 327     volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
 328     int i;
 329
 330     netif_stop_queue(dev);
 331
 332     priv->tx_full = 0;
 333     priv->cur_rx = priv->cur_tx = 0;
 334     priv->dirty_tx = 0;
 335
 336     /* Set up TX Ring */
 337     for (i = 0; i < TX_RING_SIZE; i++) {
 338         volatile struct TDRE *t = &lancedata->tx_ring[i];
 339         t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
 340         t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
 341                   TF_STP | TF_ENP;
 342         t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
 343         t->TMD3 = 0;
 344         priv->tx_ring[i] = &lancedata->tx_ring[i];
 345         priv->tx_buff[i] = lancedata->tx_buff[i];
 346 #if 0
 347         printk("TX Entry %2d at %p, Buf at %p\n", i, &lancedata->tx_ring[i],
 348                lancedata->tx_buff[i]);
 349 #endif
 350     }
 351
 352     /* Set up RX Ring */
 353     for (i = 0; i < RX_RING_SIZE; i++) {
 354         volatile struct RDRE *r = &lancedata->rx_ring[i];
 355         r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
 356         r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
 357                   RF_OWN;
 358         r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
 359         r->RMD3 = 0x0000;
 360         priv->rx_ring[i] = &lancedata->rx_ring[i];
 361         priv->rx_buff[i] = lancedata->rx_buff[i];
 362 #if 0
 363         printk("RX Entry %2d at %p, Buf at %p\n", i, &lancedata->rx_ring[i],
 364                lancedata->rx_buff[i]);
 365 #endif
 366     }
 367 }
 368
 369
 370 static int ariadne_close(struct net_device *dev)
 371 {
 372     struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
 373     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 374
 375     netif_stop_queue(dev);
 376
 377     lance->RAP = CSR112;        /* Missed Frame Count */
 378     priv->stats.rx_missed_errors = swapw(lance->RDP);
 379     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 380
 381     if (ariadne_debug > 1) {
 382         printk("%s: Shutting down ethercard, status was %2.2x.\n", dev->name,
 383                lance->RDP);
 384         printk("%s: %lu packets missed\n", dev->name,
 385                priv->stats.rx_missed_errors);
 386     }
 387
 388     /* We stop the LANCE here -- it occasionally polls memory if we don't. */
 389     lance->RDP = STOP;
 390
 391     free_irq(IRQ_AMIGA_PORTS, dev);
 392
 393     return 0;
 394 }
 395
 396
 397 static inline void ariadne_reset(struct net_device *dev)
 398 {
 399     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 400
 401     lance->RAP = CSR0;  /* PCnet-ISA Controller Status */
 402     lance->RDP = STOP;
 403     ariadne_init_ring(dev);
 404     lance->RDP = INEA|STRT;
 405     netif_start_queue(dev);
 406 }
 407
 408
 409 static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp)
 410 {
 411     struct net_device *dev = (struct net_device *)data;
 412     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 413     struct ariadne_private *priv;
 414     int csr0, boguscnt;
 415     int handled = 0;
 416
 417     if (dev == NULL) {
 418         printk("ariadne_interrupt(): irq for unknown device.\n");
 419         return IRQ_NONE;
 420     }
 421
 422     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 423
 424     if (!(lance->RDP & INTR))           /* Check if any interrupt has been */
 425         return IRQ_NONE;                /* generated by the board. */
 426
 427     priv = (struct ariadne_private *)dev->priv;
 428
 429     boguscnt = 10;
 430     while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
 431         /* Acknowledge all of the current interrupt sources ASAP. */
 432         lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
 433
 434 #if 0
 435         if (ariadne_debug > 5) {
 436             printk("%s: interrupt  csr0=%#2.2x new csr=%#2.2x.", dev->name,
 437                    csr0, lance->RDP);
 438             printk("[");
 439             if (csr0 & INTR)
 440                 printk(" INTR");
 441             if (csr0 & INEA)
 442                 printk(" INEA");
 443             if (csr0 & RXON)
 444                 printk(" RXON");
 445             if (csr0 & TXON)
 446                 printk(" TXON");
 447             if (csr0 & TDMD)
 448                 printk(" TDMD");
 449             if (csr0 & STOP)
 450                 printk(" STOP");
 451             if (csr0 & STRT)
 452                 printk(" STRT");
 453             if (csr0 & INIT)
 454                 printk(" INIT");
 455             if (csr0 & ERR)
 456                 printk(" ERR");
 457             if (csr0 & BABL)
 458                 printk(" BABL");
 459             if (csr0 & CERR)
 460                 printk(" CERR");
 461             if (csr0 & MISS)
 462                 printk(" MISS");
 463             if (csr0 & MERR)
 464                 printk(" MERR");
 465             if (csr0 & RINT)
 466                 printk(" RINT");
 467             if (csr0 & TINT)
 468                 printk(" TINT");
 469             if (csr0 & IDON)
 470                 printk(" IDON");
 471             printk(" ]\n");
 472         }
 473 #endif
 474
 475         if (csr0 & RINT) {      /* Rx interrupt */
 476             handled = 1;
 477             ariadne_rx(dev);
 478         }
 479
 480         if (csr0 & TINT) {      /* Tx-done interrupt */
 481             int dirty_tx = priv->dirty_tx;
 482
 483             handled = 1;
 484             while (dirty_tx < priv->cur_tx) {
 485                 int entry = dirty_tx % TX_RING_SIZE;
 486                 int status = lowb(priv->tx_ring[entry]->TMD1);
 487
 488                 if (status & TF_OWN)
 489                     break;      /* It still hasn't been Txed */
 490
 491                 priv->tx_ring[entry]->TMD1 &= 0xff00;
 492
 493                 if (status & TF_ERR) {
 494                     /* There was an major error, log it. */
 495                     int err_status = priv->tx_ring[entry]->TMD3;
 496                     priv->stats.tx_errors++;
 497                     if (err_status & EF_RTRY)
 498                         priv->stats.tx_aborted_errors++;
 499                     if (err_status & EF_LCAR)
 500                         priv->stats.tx_carrier_errors++;
 501                     if (err_status & EF_LCOL)
 502                         priv->stats.tx_window_errors++;
 503                     if (err_status & EF_UFLO) {
 504                         /* Ackk!  On FIFO errors the Tx unit is turned off! */
 505                         priv->stats.tx_fifo_errors++;
 506                         /* Remove this verbosity later! */
 507                         printk("%s: Tx FIFO error! Status %4.4x.\n", dev->name,
 508                                csr0);
 509                         /* Restart the chip. */
 510                         lance->RDP = STRT;
 511                     }
 512                 } else {
 513                     if (status & (TF_MORE|TF_ONE))
 514                         priv->stats.collisions++;
 515                     priv->stats.tx_packets++;
 516                 }
 517                 dirty_tx++;
 518             }
 519
 520 #ifndef final_version
 521             if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
 522                 printk("out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
 523                        dirty_tx, priv->cur_tx, priv->tx_full);
 524                 dirty_tx += TX_RING_SIZE;
 525             }
 526 #endif
 527
 528             if (priv->tx_full && netif_queue_stopped(dev) &&
 529                 dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
 530                 /* The ring is no longer full. */
 531                 priv->tx_full = 0;
 532                 netif_wake_queue(dev);
 533             }
 534
 535             priv->dirty_tx = dirty_tx;
 536         }
 537
 538         /* Log misc errors. */
 539         if (csr0 & BABL) {
 540             handled = 1;
 541             priv->stats.tx_errors++;    /* Tx babble. */
 542         }
 543         if (csr0 & MISS) {
 544             handled = 1;
 545             priv->stats.rx_errors++;    /* Missed a Rx frame. */
 546         }
 547         if (csr0 & MERR) {
 548             handled = 1;
 549             printk("%s: Bus master arbitration failure, status %4.4x.\n",
 550                    dev->name, csr0);
 551             /* Restart the chip. */
 552             lance->RDP = STRT;
 553         }
 554     }
 555
 556     /* Clear any other interrupt, and set interrupt enable. */
 557     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 558     lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
 559
 560 #if 0
 561     if (ariadne_debug > 4)
 562         printk("%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name, lance->RAP,
 563                lance->RDP);
 564 #endif
 565     return IRQ_RETVAL(handled);
 566 }
 567
 568
 569 static void ariadne_tx_timeout(struct net_device *dev)
 570 {
 571     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 572
 573     printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
 574            dev->name, lance->RDP);
 575     ariadne_reset(dev);
 576     netif_wake_queue(dev);
 577 }
 578
 579
 580 static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
 581 {
 582     struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
 583     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 584     int entry;
 585     unsigned long flags;
 586     int len = skb->len;
 587
 588 #if 0
 589     if (ariadne_debug > 3) {
 590         lance->RAP = CSR0;      /* PCnet-ISA Controller Status */
 591         printk("%s: ariadne_start_xmit() called, csr0 %4.4x.\n", dev->name,
 592                lance->RDP);
 593         lance->RDP = 0x0000;
 594     }
 595 #endif
 596
 597     /* FIXME: is the 79C960 new enough to do its own padding right ? */
 598     if (skb->len < ETH_ZLEN)
 599     {
 600         skb = skb_padto(skb, ETH_ZLEN);
 601         if (skb == NULL)
 602             return 0;
 603         len = ETH_ZLEN;
 604     }
 605
 606     /* Fill in a Tx ring entry */
 607
 608 #if 0
 609     printk("TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
 610     {
 611         int i;
 612         u_char *ptr = &((u_char *)skb->data)[6];
 613         for (i = 0; i < 6; i++)
 614             printk("%02x", ptr[i]);
 615     }
 616     printk(" to ");
 617     {
 618         int i;
 619         u_char *ptr = (u_char *)skb->data;
 620         for (i = 0; i < 6; i++)
 621             printk("%02x", ptr[i]);
 622     }
 623     printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 624 #endif
 625
 626     local_irq_save(flags);
 627
 628     entry = priv->cur_tx % TX_RING_SIZE;
 629
 630     /* Caution: the write order is important here, set the base address with
 631                 the "ownership" bits last. */
 632
 633     priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
 634     priv->tx_ring[entry]->TMD3 = 0x0000;
 635     memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
 636
 637 #if 0
 638     {
 639         int i, len;
 640
 641         len = skb->len > 64 ? 64 : skb->len;
 642         len >>= 1;
 643         for (i = 0; i < len; i += 8) {
 644             int j;
 645             printk("%04x:", i);
 646             for (j = 0; (j < 8) && ((i+j) < len); j++) {
 647                 if (!(j & 1))
 648                     printk(" ");
 649                 printk("%04x", priv->tx_buff[entry][i+j]);
 650             }
 651             printk("\n");
 652         }
 653     }
 654 #endif
 655
 656     priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
 657
 658     dev_kfree_skb(skb);
 659
 660     priv->cur_tx++;
 661     if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
 662
 663 #if 0
 664         printk("*** Subtracting TX_RING_SIZE from cur_tx (%d) and dirty_tx (%d)\n",
 665                priv->cur_tx, priv->dirty_tx);
 666 #endif
 667
 668         priv->cur_tx -= TX_RING_SIZE;
 669         priv->dirty_tx -= TX_RING_SIZE;
 670     }
 671
 672     /* Trigger an immediate send poll. */
 673     lance->RAP = CSR0;          /* PCnet-ISA Controller Status */
 674     lance->RDP = INEA|TDMD;
 675
 676     dev->trans_start = jiffies;
 677
 678     if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
 679         netif_stop_queue(dev);
 680         priv->tx_full = 1;
 681     }
 682     local_irq_restore(flags);
 683
 684     return 0;
 685 }
 686
 687
 688 static int ariadne_rx(struct net_device *dev)
 689 {
 690     struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
 691     int entry = priv->cur_rx % RX_RING_SIZE;
 692     int i;
 693
 694     /* If we own the next entry, it's a new packet. Send it up. */
 695     while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
 696         int status = lowb(priv->rx_ring[entry]->RMD1);
 697
 698         if (status != (RF_STP|RF_ENP)) {        /* There was an error. */
 699             /* There is a tricky error noted by John Murphy,
 700                 <murf@perftech.com> to Russ Nelson: Even with full-sized
 701                 buffers it's possible for a jabber packet to use two
 702                 buffers, with only the last correctly noting the error. */
 703             if (status & RF_ENP)
 704                 /* Only count a general error at the end of a packet.*/
 705                 priv->stats.rx_errors++;
 706             if (status & RF_FRAM)
 707                 priv->stats.rx_frame_errors++;
 708             if (status & RF_OFLO)
 709                 priv->stats.rx_over_errors++;
 710             if (status & RF_CRC)
 711                 priv->stats.rx_crc_errors++;
 712             if (status & RF_BUFF)
 713                 priv->stats.rx_fifo_errors++;
 714             priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
 715         } else {
 716             /* Malloc up new buffer, compatible with net-3. */
 717             short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
 718             struct sk_buff *skb;
 719
 720             skb = dev_alloc_skb(pkt_len+2);
 721             if (skb == NULL) {
 722                 printk("%s: Memory squeeze, deferring packet.\n", dev->name);
 723                 for (i = 0; i < RX_RING_SIZE; i++)
 724                     if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
 725                         break;
 726
 727                 if (i > RX_RING_SIZE-2) {
 728                     priv->stats.rx_dropped++;
 729                     priv->rx_ring[entry]->RMD1 |= RF_OWN;
 730                     priv->cur_rx++;
 731                 }
 732                 break;
 733             }
 734
 735
 736             skb->dev = dev;
 737             skb_reserve(skb,2);         /* 16 byte align */
 738             skb_put(skb,pkt_len);       /* Make room */
 739             eth_copy_and_sum(skb, (char *)priv->rx_buff[entry], pkt_len,0);
 740             skb->protocol=eth_type_trans(skb,dev);
 741 #if 0
 742             printk("RX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
 743             {
 744                 int i;
 745                 u_char *ptr = &((u_char *)skb->data)[6];
 746                 for (i = 0; i < 6; i++)
 747                     printk("%02x", ptr[i]);
 748             }
 749             printk(" to ");
 750             {
 751                 int i;
 752                 u_char *ptr = (u_char *)skb->data;
 753                 for (i = 0; i < 6; i++)
 754                     printk("%02x", ptr[i]);
 755             }
 756             printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
 757 #endif
 758
 759             netif_rx(skb);
 760             dev->last_rx = jiffies;
 761             priv->stats.rx_packets++;
 762             priv->stats.rx_bytes += pkt_len;
 763         }
 764
 765         priv->rx_ring[entry]->RMD1 |= RF_OWN;
 766         entry = (++priv->cur_rx) % RX_RING_SIZE;
 767     }
 768
 769     priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
 770
 771     /* We should check that at least two ring entries are free.  If not,
 772        we should free one and mark stats->rx_dropped++. */
 773
 774     return 0;
 775 }
 776
 777
 778 static struct net_device_stats *ariadne_get_stats(struct net_device *dev)
 779 {
 780     struct ariadne_private *priv = (struct ariadne_private *)dev->priv;
 781     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 782     short saved_addr;
 783     unsigned long flags;
 784
 785     local_irq_save(flags);
 786     saved_addr = lance->RAP;
 787     lance->RAP = CSR112;                /* Missed Frame Count */
 788     priv->stats.rx_missed_errors = swapw(lance->RDP);
 789     lance->RAP = saved_addr;
 790     local_irq_restore(flags);
 791
 792     return &priv->stats;
 793 }
 794
 795
 796 /* Set or clear the multicast filter for this adaptor.
 797     num_addrs == -1     Promiscuous mode, receive all packets
 798     num_addrs == 0      Normal mode, clear multicast list
 799     num_addrs > 0       Multicast mode, receive normal and MC packets, and do
 800                         best-effort filtering.
 801  */
 802 static void set_multicast_list(struct net_device *dev)
 803 {
 804     volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
 805
 806     if (!netif_running(dev))
 807         return;
 808
 809     netif_stop_queue(dev);
 810
 811     /* We take the simple way out and always enable promiscuous mode. */
 812     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 813     lance->RDP = STOP;                  /* Temporarily stop the lance. */
 814     ariadne_init_ring(dev);
 815
 816     if (dev->flags & IFF_PROMISC) {
 817         /* Log any net taps. */
 818         printk("%s: Promiscuous mode enabled.\n", dev->name);
 819         lance->RAP = CSR15;             /* Mode Register */
 820         lance->RDP = PROM;              /* Set promiscuous mode */
 821     } else {
 822         short multicast_table[4];
 823         int num_addrs = dev->mc_count;
 824         int i;
 825         /* We don't use the multicast table, but rely on upper-layer filtering. */
 826         memset(multicast_table, (num_addrs == 0) ? 0 : -1,
 827                sizeof(multicast_table));
 828         for (i = 0; i < 4; i++) {
 829             lance->RAP = CSR8+(i<<8);   /* Logical Address Filter */
 830             lance->RDP = swapw(multicast_table[i]);
 831         }
 832         lance->RAP = CSR15;             /* Mode Register */
 833         lance->RDP = 0x0000;            /* Unset promiscuous mode */
 834     }
 835
 836     lance->RAP = CSR0;                  /* PCnet-ISA Controller Status */
 837     lance->RDP = INEA|STRT|IDON;        /* Resume normal operation. */
 838
 839     netif_wake_queue(dev);
 840 }
 841
 842
 843 static void __exit ariadne_cleanup(void)
 844 {
 845 #ifdef MODULE
 846     struct ariadne_private *next;
 847     struct net_device *dev;
 848
 849     while (root_ariadne_dev) {
 850         next = root_ariadne_dev->next_module;
 851         dev = root_ariadne_dev->dev;
 852         unregister_netdev(dev);
 853         release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
 854         release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
 855         kfree(dev);
 856         root_ariadne_dev = next;
 857     }
 858 #endif
 859 }
 860
 861 module_init(ariadne_probe);
 862 module_exit(ariadne_cleanup);
 863
 864 MODULE_LICENSE("GPL");