src/drivers/net/3c515.c

   1 /*
   2 *    3c515.c -- 3COM 3C515 Fast Etherlink ISA 10/100BASE-TX driver for etherboot
   3 *    Copyright (C) 2002 Timothy Legge <tlegge@rogers.com>
   4 *
   5 *    This program is free software; you can redistribute it and/or modify
   6 *    it under the terms of the GNU General Public License as published by
   7 *    the Free Software Foundation; either version 2 of the License, or
   8 *    (at your option) any later version.
   9 *
  10 *    This program is distributed in the hope that it will be useful,
  11 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *    GNU General Public License for more details.
  14 *
  15 *    You should have received a copy of the GNU General Public License
  16 *    along with this program; if not, write to the Free Software
  17 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 *
  19 * Portions of this code:
  20 * Copyright (C) 1997-2002 Donald Becker  3c515.c: A 3Com ISA EtherLink XL "Corkscrew" ethernet driver for linux.
  21 * Copyright (C) 2001 P.J.H.Fox (fox@roestock.demon.co.uk) ISAPNP Tools
  22 * Copyright (c) 2002 Jaroslav Kysela <perex@suse.cz>  ISA Plug & Play support Linux Kernel
  23 * Copyright (C) 2000 Shusuke Nisiyama <shu@athena.qe.eng.hokudai.ac.jp> etherboot-5.0.5 3c595.c
  24 * Coptright (C) 1995 Martin Renters etherboot-5.0.5 3c509.c
  25 * Copyright (C) 1999 LightSys Technology Services, Inc. etherboot-5.0.5 3c90x.c
  26 * Portions Copyright (C) 1999 Steve Smith etherboot-5.0.5 3c90x.c
  27 *
  28 * The probe and reset functions and defines are direct copies from the
  29 * Becker code modified where necessary to make it work for etherboot
  30 *
  31 * The poll and transmit functions either contain code from or were written by referencing
  32 * the above referenced etherboot drivers.  This driver would not have been
  33 * possible without this prior work
  34 *
  35 * REVISION HISTORY:
  36 * ================
  37 * v0.10 4-17-2002       TJL     Initial implementation.
  38 * v0.11 4-17-2002       TJL     Cleanup of the code
  39 * v0.12 4-26-2002       TJL     Added ISA Plug and Play for Non-PNP Bioses
  40 * v0.13 6-10-2002       TJL     Fixed ISA_PNP MAC Address problem
  41 * v0.14 9-23-2003       TJL     Replaced delay with currticks
  42 *
  43 * Indent Options: indent -kr -i8
  44 * *********************************************************/
  45
  46
  47 /* to get some global routines like printf */
  48 #include "etherboot.h"
  49 /* to get the interface to the body of the program */
  50 #include "nic.h"
  51 #include <gpxe/isapnp.h>
  52 #include <gpxe/isa.h> /* for ISA_ROM */
  53 #include "timer.h"
  54 #include <gpxe/ethernet.h>
  55
  56 static void t3c515_wait(unsigned int nticks)
  57 {
  58         unsigned int to = currticks() + nticks;
  59         while (currticks() < to)
  60                 /* wait */ ;
  61 }
  62
  63 /* TJL definations */
  64 #define HZ      100
  65 static int if_port;
  66 static struct corkscrew_private *vp;
  67 /* Brought directly from 3c515.c by Becker */
  68 #define CORKSCREW 1
  69
  70 /* Maximum events (Rx packets, etc.) to handle at each interrupt.
  71 static int max_interrupt_work = 20;
  72 */
  73
  74 /* Enable the automatic media selection code -- usually set. */
  75 #define AUTOMEDIA 1
  76
  77 /* Allow the use of fragment bus master transfers instead of only
  78    programmed-I/O for Vortex cards.  Full-bus-master transfers are always
  79    enabled by default on Boomerang cards.  If VORTEX_BUS_MASTER is defined,
  80    the feature may be turned on using 'options'. */
  81 #define VORTEX_BUS_MASTER
  82
  83 /* A few values that may be tweaked. */
  84 /* Keep the ring sizes a power of two for efficiency. */
  85 #define TX_RING_SIZE    16
  86 #define RX_RING_SIZE    16
  87 #define PKT_BUF_SZ              1536    /* Size of each temporary Rx buffer. */
  88
  89 /* "Knobs" for adjusting internal parameters. */
  90 /* Put out somewhat more debugging messages. (0 - no msg, 1 minimal msgs). */
  91 #define DRIVER_DEBUG 1
  92 /* Some values here only for performance evaluation and path-coverage
  93    debugging.
  94 static int rx_nocopy, rx_copy, queued_packet;
  95 */
  96
  97 #define CORKSCREW_ID 10
  98
  99 #define EL3WINDOW(win_num) \
 100         outw(SelectWindow + (win_num), nic->ioaddr + EL3_CMD)
 101 #define EL3_CMD 0x0e
 102 #define EL3_STATUS 0x0e
 103 #define RX_BYTES_MASK                   (unsigned short) (0x07ff)
 104
 105 enum corkscrew_cmd {
 106         TotalReset = 0 << 11, SelectWindow = 1 << 11, StartCoax = 2 << 11,
 107         RxDisable = 3 << 11, RxEnable = 4 << 11, RxReset = 5 << 11,
 108         UpStall = 6 << 11, UpUnstall = (6 << 11) + 1,
 109         DownStall = (6 << 11) + 2, DownUnstall = (6 << 11) + 3,
 110         RxDiscard = 8 << 11, TxEnable = 9 << 11, TxDisable =
 111             10 << 11, TxReset = 11 << 11,
 112         FakeIntr = 12 << 11, AckIntr = 13 << 11, SetIntrEnb = 14 << 11,
 113         SetStatusEnb = 15 << 11, SetRxFilter = 16 << 11, SetRxThreshold =
 114             17 << 11,
 115         SetTxThreshold = 18 << 11, SetTxStart = 19 << 11,
 116         StartDMAUp = 20 << 11, StartDMADown = (20 << 11) + 1, StatsEnable =
 117             21 << 11,
 118         StatsDisable = 22 << 11, StopCoax = 23 << 11,
 119 };
 120
 121 /* The SetRxFilter command accepts the following classes: */
 122 enum RxFilter {
 123         RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8
 124 };
 125
 126 /* Bits in the general status register. */
 127 enum corkscrew_status {
 128         IntLatch = 0x0001, AdapterFailure = 0x0002, TxComplete = 0x0004,
 129         TxAvailable = 0x0008, RxComplete = 0x0010, RxEarly = 0x0020,
 130         IntReq = 0x0040, StatsFull = 0x0080,
 131         DMADone = 1 << 8, DownComplete = 1 << 9, UpComplete = 1 << 10,
 132         DMAInProgress = 1 << 11,        /* DMA controller is still busy. */
 133         CmdInProgress = 1 << 12,        /* EL3_CMD is still busy. */
 134 };
 135
 136 /* Register window 1 offsets, the window used in normal operation.
 137    On the Corkscrew this window is always mapped at offsets 0x10-0x1f. */
 138 enum Window1 {
 139         TX_FIFO = 0x10, RX_FIFO = 0x10, RxErrors = 0x14,
 140         RxStatus = 0x18, Timer = 0x1A, TxStatus = 0x1B,
 141         TxFree = 0x1C,          /* Remaining free bytes in Tx buffer. */
 142 };
 143 enum Window0 {
 144         Wn0IRQ = 0x08,
 145 #if defined(CORKSCREW)
 146         Wn0EepromCmd = 0x200A,  /* Corkscrew EEPROM command register. */
 147         Wn0EepromData = 0x200C, /* Corkscrew EEPROM results register. */
 148 #else
 149         Wn0EepromCmd = 10,      /* Window 0: EEPROM command register. */
 150         Wn0EepromData = 12,     /* Window 0: EEPROM results register. */
 151 #endif
 152 };
 153 enum Win0_EEPROM_bits {
 154         EEPROM_Read = 0x80, EEPROM_WRITE = 0x40, EEPROM_ERASE = 0xC0,
 155         EEPROM_EWENB = 0x30,    /* Enable erasing/writing for 10 msec. */
 156         EEPROM_EWDIS = 0x00,    /* Disable EWENB before 10 msec timeout. */
 157 };
 158
 159 enum Window3 {                  /* Window 3: MAC/config bits. */
 160         Wn3_Config = 0, Wn3_MAC_Ctrl = 6, Wn3_Options = 8,
 161 };
 162 union wn3_config {
 163         int i;
 164         struct w3_config_fields {
 165                 unsigned int ram_size:3, ram_width:1, ram_speed:2,
 166                     rom_size:2;
 167                 int pad8:8;
 168                 unsigned int ram_split:2, pad18:2, xcvr:3, pad21:1,
 169                     autoselect:1;
 170                 int pad24:7;
 171         } u;
 172 };
 173
 174 enum Window4 {
 175         Wn4_NetDiag = 6, Wn4_Media = 10,        /* Window 4: Xcvr/media bits. */
 176 };
 177 enum Win4_Media_bits {
 178         Media_SQE = 0x0008,     /* Enable SQE error counting for AUI. */
 179         Media_10TP = 0x00C0,    /* Enable link beat and jabber for 10baseT. */
 180         Media_Lnk = 0x0080,     /* Enable just link beat for 100TX/100FX. */
 181         Media_LnkBeat = 0x0800,
 182 };
 183 enum Window7 {                  /* Window 7: Bus Master control. */
 184         Wn7_MasterAddr = 0, Wn7_MasterLen = 6, Wn7_MasterStatus = 12,
 185 };
 186
 187 /* Boomerang-style bus master control registers.  Note ISA aliases! */
 188 enum MasterCtrl {
 189         PktStatus = 0x400, DownListPtr = 0x404, FragAddr = 0x408, FragLen =
 190             0x40c,
 191         TxFreeThreshold = 0x40f, UpPktStatus = 0x410, UpListPtr = 0x418,
 192 };
 193
 194 /* The Rx and Tx descriptor lists.
 195    Caution Alpha hackers: these types are 32 bits!  Note also the 8 byte
 196    alignment contraint on tx_ring[] and rx_ring[]. */
 197 struct boom_rx_desc {
 198         u32 next;
 199         s32 status;
 200         u32 addr;
 201         s32 length;
 202 };
 203
 204 /* Values for the Rx status entry. */
 205 enum rx_desc_status {
 206         RxDComplete = 0x00008000, RxDError = 0x4000,
 207         /* See boomerang_rx() for actual error bits */
 208 };
 209
 210 struct boom_tx_desc {
 211         u32 next;
 212         s32 status;
 213         u32 addr;
 214         s32 length;
 215 };
 216
 217 struct corkscrew_private {
 218         const char *product_name;
 219         struct net_device *next_module;
 220         /* The Rx and Tx rings are here to keep them quad-word-aligned. */
 221         struct boom_rx_desc rx_ring[RX_RING_SIZE];
 222         struct boom_tx_desc tx_ring[TX_RING_SIZE];
 223         /* The addresses of transmit- and receive-in-place skbuffs. */
 224         struct sk_buff *rx_skbuff[RX_RING_SIZE];
 225         struct sk_buff *tx_skbuff[TX_RING_SIZE];
 226         unsigned int cur_rx, cur_tx;    /* The next free ring entry */
 227         unsigned int dirty_rx, dirty_tx;        /* The ring entries to be free()ed. */
 228         struct sk_buff *tx_skb; /* Packet being eaten by bus master ctrl.  */
 229         int capabilities;       /* Adapter capabilities word. */
 230         int options;            /* User-settable misc. driver options. */
 231         int last_rx_packets;    /* For media autoselection. */
 232         unsigned int available_media:8, /* From Wn3_Options */
 233          media_override:3,      /* Passed-in media type. */
 234          default_media:3,       /* Read from the EEPROM. */
 235          full_duplex:1, autoselect:1, bus_master:1,     /* Vortex can only do a fragment bus-m. */
 236          full_bus_master_tx:1, full_bus_master_rx:1,    /* Boomerang  */
 237          tx_full:1;
 238 };
 239
 240 /* The action to take with a media selection timer tick.
 241    Note that we deviate from the 3Com order by checking 10base2 before AUI.
 242  */
 243 enum xcvr_types {
 244         XCVR_10baseT =
 245             0, XCVR_AUI, XCVR_10baseTOnly, XCVR_10base2, XCVR_100baseTx,
 246         XCVR_100baseFx, XCVR_MII = 6, XCVR_Default = 8,
 247 };
 248
 249 static struct media_table {
 250         char *name;
 251         unsigned int media_bits:16,     /* Bits to set in Wn4_Media register. */
 252          mask:8,                /* The transceiver-present bit in Wn3_Config. */
 253          next:8;                /* The media type to try next. */
 254         short wait;             /* Time before we check media status. */
 255 } media_tbl[] = {
 256         {
 257         "10baseT", Media_10TP, 0x08, XCVR_10base2, (14 * HZ) / 10}
 258         , {
 259         "10Mbs AUI", Media_SQE, 0x20, XCVR_Default, (1 * HZ) / 10}
 260         , {
 261         "undefined", 0, 0x80, XCVR_10baseT, 10000}
 262         , {
 263         "10base2", 0, 0x10, XCVR_AUI, (1 * HZ) / 10}
 264         , {
 265         "100baseTX", Media_Lnk, 0x02, XCVR_100baseFx,
 266                     (14 * HZ) / 10}
 267         , {
 268         "100baseFX", Media_Lnk, 0x04, XCVR_MII, (14 * HZ) / 10}
 269         , {
 270         "MII", 0, 0x40, XCVR_10baseT, 3 * HZ}
 271         , {
 272         "undefined", 0, 0x01, XCVR_10baseT, 10000}
 273         , {
 274         "Default", 0, 0xFF, XCVR_10baseT, 10000}
 275 ,};
 276
 277 /* TILEG Modified to remove reference to dev */
 278 static int corkscrew_found_device(int ioaddr, int irq, int product_index,
 279                                   int options, struct nic *nic);
 280 static int corkscrew_probe1(int ioaddr, int irq, int product_index,
 281                             struct nic *nic);
 282
 283 /* This driver uses 'options' to pass the media type, full-duplex flag, etc. */
 284 /* Note: this is the only limit on the number of cards supported!! */
 285 static int options = -1;
 286
 287 /* End Brought directly from 3c515.c by Becker */
 288
 289 /**************************************************************************
 290 RESET - Reset adapter
 291 ***************************************************************************/
 292 static void t515_reset(struct nic *nic)
 293 {
 294         union wn3_config config;
 295         int i;
 296
 297         /* Before initializing select the active media port. */
 298         EL3WINDOW(3);
 299         if (vp->full_duplex)
 300                 outb(0x20, nic->ioaddr + Wn3_MAC_Ctrl); /* Set the full-duplex bit. */
 301         config.i = inl(nic->ioaddr + Wn3_Config);
 302
 303         if (vp->media_override != 7) {
 304                 DBG ( "Media override to transceiver %d (%s).\n",
 305                       vp->media_override,
 306                       media_tbl[vp->media_override].name);
 307                 if_port = vp->media_override;
 308         } else if (vp->autoselect) {
 309                 /* Find first available media type, starting with 100baseTx. */
 310                 if_port = 4;
 311                 while (!(vp->available_media & media_tbl[if_port].mask))
 312                         if_port = media_tbl[if_port].next;
 313
 314                 DBG ( "Initial media type %s.\n",
 315                       media_tbl[if_port].name);
 316         } else
 317                 if_port = vp->default_media;
 318
 319         config.u.xcvr = if_port;
 320         outl(config.i, nic->ioaddr + Wn3_Config);
 321
 322         DBG ( "corkscrew_open() InternalConfig 0x%hX.\n",
 323               config.i);
 324
 325         outw(TxReset, nic->ioaddr + EL3_CMD);
 326         for (i = 20; i >= 0; i--)
 327                 if (!(inw(nic->ioaddr + EL3_STATUS) & CmdInProgress))
 328                         break;
 329
 330         outw(RxReset, nic->ioaddr + EL3_CMD);
 331         /* Wait a few ticks for the RxReset command to complete. */
 332         for (i = 20; i >= 0; i--)
 333                 if (!(inw(nic->ioaddr + EL3_STATUS) & CmdInProgress))
 334                         break;
 335
 336         outw(SetStatusEnb | 0x00, nic->ioaddr + EL3_CMD);
 337
 338 #ifdef debug_3c515
 339                 EL3WINDOW(4);
 340                 DBG ( "FIXME: fix print for irq, not 9" );
 341                 DBG ( "corkscrew_open() irq %d media status 0x%hX.\n",
 342                       9, inw(nic->ioaddr + Wn4_Media) );
 343 #endif
 344
 345         /* Set the station address and mask in window 2 each time opened. */
 346         EL3WINDOW(2);
 347         for (i = 0; i < 6; i++)
 348                 outb(nic->node_addr[i], nic->ioaddr + i);
 349         for (; i < 12; i += 2)
 350                 outw(0, nic->ioaddr + i);
 351
 352         if (if_port == 3)
 353                 /* Start the thinnet transceiver. We should really wait 50ms... */
 354                 outw(StartCoax, nic->ioaddr + EL3_CMD);
 355         EL3WINDOW(4);
 356         outw((inw(nic->ioaddr + Wn4_Media) & ~(Media_10TP | Media_SQE)) |
 357              media_tbl[if_port].media_bits, nic->ioaddr + Wn4_Media);
 358
 359         /* Switch to the stats window, and clear all stats by reading. */
 360 /*      outw(StatsDisable, nic->ioaddr + EL3_CMD);*/
 361         EL3WINDOW(6);
 362         for (i = 0; i < 10; i++)
 363                 inb(nic->ioaddr + i);
 364         inw(nic->ioaddr + 10);
 365         inw(nic->ioaddr + 12);
 366         /* New: On the Vortex we must also clear the BadSSD counter. */
 367         EL3WINDOW(4);
 368         inb(nic->ioaddr + 12);
 369         /* ..and on the Boomerang we enable the extra statistics bits. */
 370         outw(0x0040, nic->ioaddr + Wn4_NetDiag);
 371
 372         /* Switch to register set 7 for normal use. */
 373         EL3WINDOW(7);
 374
 375         /* Temporarily left in place.  If these FIXMEs are printed
 376            it meand that special logic for that card may need to be added
 377            see Becker's 3c515.c driver */
 378         if (vp->full_bus_master_rx) {   /* Boomerang bus master. */
 379                 printf("FIXME: Is this if necessary");
 380                 vp->cur_rx = vp->dirty_rx = 0;
 381                 DBG ( "   Filling in the Rx ring.\n" );
 382                 for (i = 0; i < RX_RING_SIZE; i++) {
 383                         printf("FIXME: Is this if necessary");
 384                 }
 385         }
 386         if (vp->full_bus_master_tx) {   /* Boomerang bus master Tx. */
 387                 vp->cur_tx = vp->dirty_tx = 0;
 388                 outb(PKT_BUF_SZ >> 8, nic->ioaddr + TxFreeThreshold);   /* Room for a packet. */
 389                 /* Clear the Tx ring. */
 390                 for (i = 0; i < TX_RING_SIZE; i++)
 391                         vp->tx_skbuff[i] = 0;
 392                 outl(0, nic->ioaddr + DownListPtr);
 393         }
 394         /* Set receiver mode: presumably accept b-case and phys addr only. */
 395         outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
 396              nic->ioaddr + EL3_CMD);
 397
 398         outw(RxEnable, nic->ioaddr + EL3_CMD);  /* Enable the receiver. */
 399         outw(TxEnable, nic->ioaddr + EL3_CMD);  /* Enable transmitter. */
 400         /* Allow status bits to be seen. */
 401         outw(SetStatusEnb | AdapterFailure | IntReq | StatsFull |
 402              (vp->full_bus_master_tx ? DownComplete : TxAvailable) |
 403              (vp->full_bus_master_rx ? UpComplete : RxComplete) |
 404              (vp->bus_master ? DMADone : 0), nic->ioaddr + EL3_CMD);
 405         /* Ack all pending events, and set active indicator mask. */
 406         outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
 407              nic->ioaddr + EL3_CMD);
 408         outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
 409              | (vp->bus_master ? DMADone : 0) | UpComplete | DownComplete,
 410              nic->ioaddr + EL3_CMD);
 411
 412 }
 413
 414 /**************************************************************************
 415 POLL - Wait for a frame
 416 ***************************************************************************/
 417 static int t515_poll(struct nic *nic, int retrieve)
 418 {
 419         short status, cst;
 420         register short rx_fifo;
 421
 422         cst = inw(nic->ioaddr + EL3_STATUS);
 423
 424         if ((cst & RxComplete) == 0) {
 425                 /* Ack all pending events, and set active indicator mask. */
 426                 outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
 427                      nic->ioaddr + EL3_CMD);
 428                 outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete |
 429                      StatsFull | (vp->
 430                                   bus_master ? DMADone : 0) | UpComplete |
 431                      DownComplete, nic->ioaddr + EL3_CMD);
 432                 return 0;
 433         }
 434         status = inw(nic->ioaddr + RxStatus);
 435
 436         if (status & RxDError) {
 437                 printf("RxDError\n");
 438                 outw(RxDiscard, nic->ioaddr + EL3_CMD);
 439                 return 0;
 440         }
 441
 442         rx_fifo = status & RX_BYTES_MASK;
 443         if (rx_fifo == 0)
 444                 return 0;
 445
 446         if ( ! retrieve ) return 1;
 447
 448         DBG ( "[l=%d", rx_fifo );
 449         insw(nic->ioaddr + RX_FIFO, nic->packet, rx_fifo / 2);
 450         if (rx_fifo & 1)
 451                 nic->packet[rx_fifo - 1] = inb(nic->ioaddr + RX_FIFO);
 452         nic->packetlen = rx_fifo;
 453
 454         while (1) {
 455                 status = inw(nic->ioaddr + RxStatus);
 456                 DBG ( "0x%hX*", status );
 457                 rx_fifo = status & RX_BYTES_MASK;
 458
 459                 if (rx_fifo > 0) {
 460                         insw(nic->ioaddr + RX_FIFO, nic->packet + nic->packetlen,
 461                              rx_fifo / 2);
 462                         if (rx_fifo & 1)
 463                                 nic->packet[nic->packetlen + rx_fifo - 1] =
 464                                     inb(nic->ioaddr + RX_FIFO);
 465                         nic->packetlen += rx_fifo;
 466                         DBG ( "+%d", rx_fifo );
 467                 }
 468                 if ((status & RxComplete) == 0) {
 469                         DBG ( "=%d", nic->packetlen );
 470                         break;
 471                 }
 472                 udelay(1000);
 473         }
 474
 475         /* acknowledge reception of packet */
 476         outw(RxDiscard, nic->ioaddr + EL3_CMD);
 477         while (inw(nic->ioaddr + EL3_STATUS) & CmdInProgress);
 478 #ifdef debug_3c515
 479         {
 480                 unsigned short type = 0;
 481                 type = (nic->packet[12] << 8) | nic->packet[13];
 482                 if (nic->packet[0] + nic->packet[1] + nic->packet[2] +
 483                     nic->packet[3] + nic->packet[4] + nic->packet[5] ==
 484                     0xFF * ETH_ALEN)
 485                         DBG ( ",t=0x%hX,b]", type );
 486                 else
 487                         DBG ( ",t=0x%hX]", type );
 488         }
 489 #endif
 490
 491         return 1;
 492 }
 493
 494 /*************************************************************************
 495         3Com 515 - specific routines
 496 **************************************************************************/
 497 static char padmap[] = {
 498         0, 3, 2, 1
 499 };
 500 /**************************************************************************
 501 TRANSMIT - Transmit a frame
 502 ***************************************************************************/
 503 static void t515_transmit(struct nic *nic, const char *d,       /* Destination */
 504                           unsigned int t,       /* Type */
 505                           unsigned int s,       /* size */
 506                           const char *p)
 507 {                               /* Packet */
 508         register int len;
 509         int pad;
 510         int status;
 511
 512         DBG ( "{l=%d,t=0x%hX}", s + ETH_HLEN, t );
 513
 514         /* swap bytes of type */
 515         t = htons(t);
 516
 517         len = s + ETH_HLEN;     /* actual length of packet */
 518         pad = padmap[len & 3];
 519
 520         /*
 521          * The 3c515 automatically pads short packets to minimum ethernet length,
 522          * but we drop packets that are too large. Perhaps we should truncate
 523          * them instead?
 524          Copied from 3c595.  Is this true for the 3c515?
 525          */
 526         if (len + pad > ETH_FRAME_LEN) {
 527                 return;
 528         }
 529         /* drop acknowledgements */
 530         while ((status = inb(nic->ioaddr + TxStatus)) & TxComplete) {
 531                 /*if(status & (TXS_UNDERRUN|0x88|TXS_STATUS_OVERFLOW)) { */
 532                 outw(TxReset, nic->ioaddr + EL3_CMD);
 533                 outw(TxEnable, nic->ioaddr + EL3_CMD);
 534 /*              }                                                          */
 535
 536                 outb(0x0, nic->ioaddr + TxStatus);
 537         }
 538
 539         while (inw(nic->ioaddr + TxFree) < len + pad + 4) {
 540                 /* no room in FIFO */
 541         }
 542
 543         outw(len, nic->ioaddr + TX_FIFO);
 544         outw(0x0, nic->ioaddr + TX_FIFO);       /* Second dword meaningless */
 545
 546         /* write packet */
 547         outsw(nic->ioaddr + TX_FIFO, d, ETH_ALEN / 2);
 548         outsw(nic->ioaddr + TX_FIFO, nic->node_addr, ETH_ALEN / 2);
 549         outw(t, nic->ioaddr + TX_FIFO);
 550         outsw(nic->ioaddr + TX_FIFO, p, s / 2);
 551
 552         if (s & 1)
 553                 outb(*(p + s - 1), nic->ioaddr + TX_FIFO);
 554
 555         while (pad--)
 556                 outb(0, nic->ioaddr + TX_FIFO); /* Padding */
 557
 558         /* wait for Tx complete */
 559         while ((inw(nic->ioaddr + EL3_STATUS) & CmdInProgress) != 0);
 560 }
 561
 562 /**************************************************************************
 563 DISABLE - Turn off ethernet interface
 564 ***************************************************************************/
 565 static void t515_disable ( struct nic *nic,
 566                            struct isapnp_device *isapnp ) {
 567
 568         t515_reset(nic);
 569
 570         /* This is a hack.  Since ltsp worked on my
 571            system without any disable functionality I
 572            have no way to determine if this works */
 573
 574         /* Disable the receiver and transmitter. */
 575         outw(RxDisable, nic->ioaddr + EL3_CMD);
 576         outw(TxDisable, nic->ioaddr + EL3_CMD);
 577
 578         if (if_port == XCVR_10base2)
 579                 /* Turn off thinnet power.  Green! */
 580                 outw(StopCoax, nic->ioaddr + EL3_CMD);
 581
 582
 583         outw(SetIntrEnb | 0x0000, nic->ioaddr + EL3_CMD);
 584
 585         deactivate_isapnp_device ( isapnp );
 586         return;
 587 }
 588
 589 static void t515_irq(struct nic *nic __unused, irq_action_t action __unused)
 590 {
 591   switch ( action ) {
 592   case DISABLE :
 593     break;
 594   case ENABLE :
 595     break;
 596   case FORCE :
 597     break;
 598   }
 599 }
 600
 601 static struct nic_operations t515_operations = {
 602         .connect        = dummy_connect,
 603         .poll           = t515_poll,
 604         .transmit       = t515_transmit,
 605         .irq            = t515_irq,
 606
 607 };
 608
 609 /**************************************************************************
 610 PROBE - Look for an adapter, this routine's visible to the outside
 611 You should omit the last argument struct pci_device * for a non-PCI NIC
 612 ***************************************************************************/
 613 static int t515_probe ( struct nic *nic, struct isapnp_device *isapnp ) {
 614
 615         /* Direct copy from Beckers 3c515.c removing any ISAPNP sections */
 616
 617         isapnp_fill_nic ( nic, isapnp );
 618
 619         nic->ioaddr = isapnp->ioaddr;
 620         nic->irqno = isapnp->irqno;
 621         activate_isapnp_device ( isapnp );
 622
 623         /* Check the resource configuration for a matching ioaddr. */
 624         if ((unsigned)(inw(nic->ioaddr + 0x2002) & 0x1f0)
 625             != (nic->ioaddr & 0x1f0)) {
 626                 DBG ( "3c515 ioaddr mismatch\n" );
 627                 return 0;
 628         }
 629
 630         /* Verify by reading the device ID from the EEPROM. */
 631         {
 632                 int timer;
 633                 outw(EEPROM_Read + 7, nic->ioaddr + Wn0EepromCmd);
 634                 /* Pause for at least 162 us. for the read to take place. */
 635                 for (timer = 4; timer >= 0; timer--) {
 636                         t3c515_wait(1);
 637                         if ((inw(nic->ioaddr + Wn0EepromCmd) & 0x0200) == 0)
 638                                 break;
 639                 }
 640                 if (inw(nic->ioaddr + Wn0EepromData) != 0x6d50) {
 641                         DBG ( "3c515 read incorrect vendor ID from EEPROM" );
 642                         return 0;
 643                 }
 644
 645         }
 646         DBG ( "3c515 Resource configuration register 0x%lX, DCR 0x%hX.\n",
 647               inl(nic->ioaddr + 0x2002), inw(nic->ioaddr + 0x2000) );
 648         corkscrew_found_device(nic->ioaddr, nic->irqno, CORKSCREW_ID,
 649                                options, nic);
 650
 651         t515_reset(nic);
 652         nic->nic_op     = &t515_operations;
 653         return 1;
 654 }
 655
 656 static int
 657 corkscrew_found_device(int ioaddr, int irq,
 658                        int product_index, int options, struct nic *nic)
 659 {
 660         /* Direct copy from Becker 3c515.c with unecessary parts removed */
 661         vp->product_name = "3c515";
 662         vp->options = options;
 663         if (options >= 0) {
 664                 vp->media_override =
 665                     ((options & 7) == 2) ? 0 : options & 7;
 666                 vp->full_duplex = (options & 8) ? 1 : 0;
 667                 vp->bus_master = (options & 16) ? 1 : 0;
 668         } else {
 669                 vp->media_override = 7;
 670                 vp->full_duplex = 0;
 671                 vp->bus_master = 0;
 672         }
 673
 674         corkscrew_probe1(ioaddr, irq, product_index, nic);
 675         return 0;
 676 }
 677
 678 static int
 679 corkscrew_probe1(int ioaddr, int irq, int product_index __unused,
 680                  struct nic *nic)
 681 {
 682         unsigned int eeprom[0x40], checksum = 0;        /* EEPROM contents */
 683         int i;
 684
 685         printf("3Com %s at 0x%hX, ", vp->product_name, ioaddr);
 686
 687         /* Read the station address from the EEPROM. */
 688         EL3WINDOW(0);
 689         for (i = 0; i < 0x18; i++) {
 690                 short *phys_addr = (short *) nic->node_addr;
 691                 int timer;
 692                 outw(EEPROM_Read + i, ioaddr + Wn0EepromCmd);
 693                 /* Pause for at least 162 us. for the read to take place. */
 694                 for (timer = 4; timer >= 0; timer--) {
 695                         t3c515_wait(1);
 696                         if ((inw(ioaddr + Wn0EepromCmd) & 0x0200) == 0)
 697                                 break;
 698                 }
 699                 eeprom[i] = inw(ioaddr + Wn0EepromData);
 700                 DBG ( "Value %d: %hX        ", i, eeprom[i] );
 701                 checksum ^= eeprom[i];
 702                 if (i < 3)
 703                         phys_addr[i] = htons(eeprom[i]);
 704         }
 705         checksum = (checksum ^ (checksum >> 8)) & 0xff;
 706         if (checksum != 0x00)
 707                 printf(" ***INVALID CHECKSUM 0x%hX*** ", checksum);
 708
 709         DBG ( "%s", eth_ntoa ( nic->node_addr ) );
 710
 711         if (eeprom[16] == 0x11c7) {     /* Corkscrew */
 712
 713         }
 714         printf(", IRQ %d\n", irq);
 715         /* Tell them about an invalid IRQ. */
 716         if ( (irq <= 0 || irq > 15) ) {
 717                 DBG (" *** Warning: this IRQ is unlikely to work! ***\n" );
 718         }
 719
 720         {
 721                 char *ram_split[] = { "5:3", "3:1", "1:1", "3:5" };
 722                 union wn3_config config;
 723                 EL3WINDOW(3);
 724                 vp->available_media = inw(ioaddr + Wn3_Options);
 725                 config.i = inl(ioaddr + Wn3_Config);
 726                 DBG ( "  Internal config register is %4.4x, "
 727                       "transceivers 0x%hX.\n",
 728                       config.i, inw(ioaddr + Wn3_Options) );
 729                 printf
 730                     ("  %dK %s-wide RAM %s Rx:Tx split, %s%s interface.\n",
 731                      8 << config.u.ram_size,
 732                      config.u.ram_width ? "word" : "byte",
 733                      ram_split[config.u.ram_split],
 734                      config.u.autoselect ? "autoselect/" : "",
 735                      media_tbl[config.u.xcvr].name);
 736                 if_port = config.u.xcvr;
 737                 vp->default_media = config.u.xcvr;
 738                 vp->autoselect = config.u.autoselect;
 739         }
 740         if (vp->media_override != 7) {
 741                 printf("  Media override to transceiver type %d (%s).\n",
 742                        vp->media_override,
 743                        media_tbl[vp->media_override].name);
 744                 if_port = vp->media_override;
 745         }
 746
 747         vp->capabilities = eeprom[16];
 748         vp->full_bus_master_tx = (vp->capabilities & 0x20) ? 1 : 0;
 749         /* Rx is broken at 10mbps, so we always disable it. */
 750         /* vp->full_bus_master_rx = 0; */
 751         vp->full_bus_master_rx = (vp->capabilities & 0x20) ? 1 : 0;
 752
 753         return 0;
 754 }
 755
 756 static struct isapnp_device_id t515_adapters[] = {
 757         { "3c515 (ISAPnP)", ISAPNP_VENDOR('T','C','M'), 0x5051 },
 758 };
 759
 760 ISAPNP_DRIVER ( t515_driver, t515_adapters );
 761
 762 DRIVER ( "3c515", nic_driver, isapnp_driver, t515_driver,
 763          t515_probe, t515_disable );
 764
 765 ISA_ROM ( "3c515", "3c515 Fast EtherLink ISAPnP" );