drivers/net/hamradio/baycom_epp.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      baycom_epp.c  -- baycom epp radio modem driver.
   5  *
   6  *      Copyright (C) 1998-2000
   7  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *  Please note that the GPL allows you to use the driver, NOT the radio.
  24  *  In order to use the radio, you need a license from the communications
  25  *  authority of your country.
  26  *
  27  *
  28  *  History:
  29  *   0.1  xx.xx.1998  Initial version by Matthias Welwarsky (dg2fef)
  30  *   0.2  21.04.1998  Massive rework by Thomas Sailer
  31  *                    Integrated FPGA EPP modem configuration routines
  32  *   0.3  11.05.1998  Took FPGA config out and moved it into a separate program
  33  *   0.4  26.07.1999  Adapted to new lowlevel parport driver interface
  34  *   0.5  03.08.1999  adapt to Linus' new __setup/__initcall
  35  *                    removed some pre-2.2 kernel compatibility cruft
  36  *   0.6  10.08.1999  Check if parport can do SPP and is safe to access during interrupt contexts
  37  *   0.7  12.02.2000  adapted to softnet driver interface
  38  *
  39  */
  40
  41 /*****************************************************************************/
  42
  43 #include <linux/crc-ccitt.h>
  44 #include <linux/module.h>
  45 #include <linux/kernel.h>
  46 #include <linux/init.h>
  47 #include <linux/string.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/fs.h>
  50 #include <linux/parport.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/hdlcdrv.h>
  53 #include <linux/baycom.h>
  54 #include <linux/jiffies.h>
  55 #include <net/ax25.h>
  56 #include <asm/uaccess.h>
  57
  58 /* --------------------------------------------------------------------- */
  59
  60 #define BAYCOM_DEBUG
  61 #define BAYCOM_MAGIC 19730510
  62
  63 /* --------------------------------------------------------------------- */
  64
  65 static const char paranoia_str[] = KERN_ERR
  66         "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
  67
  68 static const char bc_drvname[] = "baycom_epp";
  69 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  70 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
  71
  72 /* --------------------------------------------------------------------- */
  73
  74 #define NR_PORTS 4
  75
  76 static struct net_device *baycom_device[NR_PORTS];
  77
  78 /* --------------------------------------------------------------------- */
  79
  80 /* EPP status register */
  81 #define EPP_DCDBIT      0x80
  82 #define EPP_PTTBIT      0x08
  83 #define EPP_NREF        0x01
  84 #define EPP_NRAEF       0x02
  85 #define EPP_NRHF        0x04
  86 #define EPP_NTHF        0x20
  87 #define EPP_NTAEF       0x10
  88 #define EPP_NTEF        EPP_PTTBIT
  89
  90 /* EPP control register */
  91 #define EPP_TX_FIFO_ENABLE 0x10
  92 #define EPP_RX_FIFO_ENABLE 0x08
  93 #define EPP_MODEM_ENABLE   0x20
  94 #define EPP_LEDS           0xC0
  95 #define EPP_IRQ_ENABLE     0x10
  96
  97 /* LPT registers */
  98 #define LPTREG_ECONTROL       0x402
  99 #define LPTREG_CONFIGB        0x401
 100 #define LPTREG_CONFIGA        0x400
 101 #define LPTREG_EPPDATA        0x004
 102 #define LPTREG_EPPADDR        0x003
 103 #define LPTREG_CONTROL        0x002
 104 #define LPTREG_STATUS         0x001
 105 #define LPTREG_DATA           0x000
 106
 107 /* LPT control register */
 108 #define LPTCTRL_PROGRAM       0x04   /* 0 to reprogram */
 109 #define LPTCTRL_WRITE         0x01
 110 #define LPTCTRL_ADDRSTB       0x08
 111 #define LPTCTRL_DATASTB       0x02
 112 #define LPTCTRL_INTEN         0x10
 113
 114 /* LPT status register */
 115 #define LPTSTAT_SHIFT_NINTR   6
 116 #define LPTSTAT_WAIT          0x80
 117 #define LPTSTAT_NINTR         (1<<LPTSTAT_SHIFT_NINTR)
 118 #define LPTSTAT_PE            0x20
 119 #define LPTSTAT_DONE          0x10
 120 #define LPTSTAT_NERROR        0x08
 121 #define LPTSTAT_EPPTIMEOUT    0x01
 122
 123 /* LPT data register */
 124 #define LPTDATA_SHIFT_TDI     0
 125 #define LPTDATA_SHIFT_TMS     2
 126 #define LPTDATA_TDI           (1<<LPTDATA_SHIFT_TDI)
 127 #define LPTDATA_TCK           0x02
 128 #define LPTDATA_TMS           (1<<LPTDATA_SHIFT_TMS)
 129 #define LPTDATA_INITBIAS      0x80
 130
 131
 132 /* EPP modem config/status bits */
 133 #define EPP_DCDBIT            0x80
 134 #define EPP_PTTBIT            0x08
 135 #define EPP_RXEBIT            0x01
 136 #define EPP_RXAEBIT           0x02
 137 #define EPP_RXHFULL           0x04
 138
 139 #define EPP_NTHF              0x20
 140 #define EPP_NTAEF             0x10
 141 #define EPP_NTEF              EPP_PTTBIT
 142
 143 #define EPP_TX_FIFO_ENABLE    0x10
 144 #define EPP_RX_FIFO_ENABLE    0x08
 145 #define EPP_MODEM_ENABLE      0x20
 146 #define EPP_LEDS              0xC0
 147 #define EPP_IRQ_ENABLE        0x10
 148
 149 /* Xilinx 4k JTAG instructions */
 150 #define XC4K_IRLENGTH   3
 151 #define XC4K_EXTEST     0
 152 #define XC4K_PRELOAD    1
 153 #define XC4K_CONFIGURE  5
 154 #define XC4K_BYPASS     7
 155
 156 #define EPP_CONVENTIONAL  0
 157 #define EPP_FPGA          1
 158 #define EPP_FPGAEXTSTATUS 2
 159
 160 #define TXBUFFER_SIZE     ((HDLCDRV_MAXFLEN*6/5)+8)
 161
 162 /* ---------------------------------------------------------------------- */
 163 /*
 164  * Information that need to be kept for each board.
 165  */
 166
 167 struct baycom_state {
 168         int magic;
 169
 170         struct pardevice *pdev;
 171         struct net_device *dev;
 172         unsigned int work_running;
 173         struct delayed_work run_work;
 174         unsigned int modem;
 175         unsigned int bitrate;
 176         unsigned char stat;
 177
 178         struct {
 179                 unsigned int intclk;
 180                 unsigned int fclk;
 181                 unsigned int bps;
 182                 unsigned int extmodem;
 183                 unsigned int loopback;
 184         } cfg;
 185
 186         struct hdlcdrv_channel_params ch_params;
 187
 188         struct {
 189                 unsigned int bitbuf, bitstream, numbits, state;
 190                 unsigned char *bufptr;
 191                 int bufcnt;
 192                 unsigned char buf[TXBUFFER_SIZE];
 193         } hdlcrx;
 194
 195         struct {
 196                 int calibrate;
 197                 int slotcnt;
 198                 int flags;
 199                 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
 200                 unsigned char *bufptr;
 201                 int bufcnt;
 202                 unsigned char buf[TXBUFFER_SIZE];
 203         } hdlctx;
 204
 205         struct net_device_stats stats;
 206         unsigned int ptt_keyed;
 207         struct sk_buff *skb;  /* next transmit packet  */
 208
 209 #ifdef BAYCOM_DEBUG
 210         struct debug_vals {
 211                 unsigned long last_jiffies;
 212                 unsigned cur_intcnt;
 213                 unsigned last_intcnt;
 214                 int cur_pllcorr;
 215                 int last_pllcorr;
 216                 unsigned int mod_cycles;
 217                 unsigned int demod_cycles;
 218         } debug_vals;
 219 #endif /* BAYCOM_DEBUG */
 220 };
 221
 222 /* --------------------------------------------------------------------- */
 223
 224 #define KISS_VERBOSE
 225
 226 /* --------------------------------------------------------------------- */
 227
 228 #define PARAM_TXDELAY   1
 229 #define PARAM_PERSIST   2
 230 #define PARAM_SLOTTIME  3
 231 #define PARAM_TXTAIL    4
 232 #define PARAM_FULLDUP   5
 233 #define PARAM_HARDWARE  6
 234 #define PARAM_RETURN    255
 235
 236 /* --------------------------------------------------------------------- */
 237 /*
 238  * the CRC routines are stolen from WAMPES
 239  * by Dieter Deyke
 240  */
 241
 242
 243 /*---------------------------------------------------------------------------*/
 244
 245 #if 0
 246 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 247 {
 248         unsigned int crc = 0xffff;
 249
 250         for (;len>0;len--)
 251                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
 252         crc ^= 0xffff;
 253         *buffer++ = crc;
 254         *buffer++ = crc >> 8;
 255 }
 256 #endif
 257
 258 /*---------------------------------------------------------------------------*/
 259
 260 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 261 {
 262         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 263 }
 264
 265 /*---------------------------------------------------------------------------*/
 266
 267 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
 268 {
 269         return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
 270 }
 271
 272 /* ---------------------------------------------------------------------- */
 273
 274 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
 275
 276 /* --------------------------------------------------------------------- */
 277
 278 static inline void baycom_int_freq(struct baycom_state *bc)
 279 {
 280 #ifdef BAYCOM_DEBUG
 281         unsigned long cur_jiffies = jiffies;
 282         /*
 283          * measure the interrupt frequency
 284          */
 285         bc->debug_vals.cur_intcnt++;
 286         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 287                 bc->debug_vals.last_jiffies = cur_jiffies;
 288                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 289                 bc->debug_vals.cur_intcnt = 0;
 290                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 291                 bc->debug_vals.cur_pllcorr = 0;
 292         }
 293 #endif /* BAYCOM_DEBUG */
 294 }
 295
 296 /* ---------------------------------------------------------------------- */
 297 /*
 298  *    eppconfig_path should be setable  via /proc/sys.
 299  */
 300
 301 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
 302
 303 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 304
 305 /* eppconfig: called during ifconfig up to configure the modem */
 306 static int eppconfig(struct baycom_state *bc)
 307 {
 308         char modearg[256];
 309         char portarg[16];
 310         char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
 311                          NULL };
 312
 313         /* set up arguments */
 314         sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
 315                 bc->cfg.intclk ? "int" : "ext",
 316                 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
 317                 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
 318                 bc->cfg.loopback ? ",loopback" : "");
 319         sprintf(portarg, "%ld", bc->pdev->port->base);
 320         printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
 321
 322         return call_usermodehelper(eppconfig_path, argv, envp, 1);
 323 }
 324
 325 /* ---------------------------------------------------------------------- */
 326
 327 static void epp_interrupt(int irq, void *dev_id)
 328 {
 329 }
 330
 331 /* ---------------------------------------------------------------------- */
 332
 333 static inline void do_kiss_params(struct baycom_state *bc,
 334                                   unsigned char *data, unsigned long len)
 335 {
 336
 337 #ifdef KISS_VERBOSE
 338 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 339 #else /* KISS_VERBOSE */
 340 #define PKP(a,b)
 341 #endif /* KISS_VERBOSE */
 342
 343         if (len < 2)
 344                 return;
 345         switch(data[0]) {
 346         case PARAM_TXDELAY:
 347                 bc->ch_params.tx_delay = data[1];
 348                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 349                 break;
 350         case PARAM_PERSIST:
 351                 bc->ch_params.ppersist = data[1];
 352                 PKP("p persistence = %u", bc->ch_params.ppersist);
 353                 break;
 354         case PARAM_SLOTTIME:
 355                 bc->ch_params.slottime = data[1];
 356                 PKP("slot time = %ums", bc->ch_params.slottime);
 357                 break;
 358         case PARAM_TXTAIL:
 359                 bc->ch_params.tx_tail = data[1];
 360                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 361                 break;
 362         case PARAM_FULLDUP:
 363                 bc->ch_params.fulldup = !!data[1];
 364                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 365                 break;
 366         default:
 367                 break;
 368         }
 369 #undef PKP
 370 }
 371
 372 /* --------------------------------------------------------------------- */
 373
 374 static void encode_hdlc(struct baycom_state *bc)
 375 {
 376         struct sk_buff *skb;
 377         unsigned char *wp, *bp;
 378         int pkt_len;
 379         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 380         unsigned char crcarr[2];
 381         int j;
 382
 383         if (bc->hdlctx.bufcnt > 0)
 384                 return;
 385         skb = bc->skb;
 386         if (!skb)
 387                 return;
 388         bc->skb = NULL;
 389         pkt_len = skb->len-1; /* strip KISS byte */
 390         wp = bc->hdlctx.buf;
 391         bp = skb->data+1;
 392         crc = calc_crc_ccitt(bp, pkt_len);
 393         crcarr[0] = crc;
 394         crcarr[1] = crc >> 8;
 395         *wp++ = 0x7e;
 396         bitstream = bitbuf = numbit = 0;
 397         while (pkt_len > -2) {
 398                 bitstream >>= 8;
 399                 bitstream |= ((unsigned int)*bp) << 8;
 400                 bitbuf |= ((unsigned int)*bp) << numbit;
 401                 notbitstream = ~bitstream;
 402                 bp++;
 403                 pkt_len--;
 404                 if (!pkt_len)
 405                         bp = crcarr;
 406                 for (j = 0; j < 8; j++)
 407                         if (unlikely(!(notbitstream & (0x1f0 << j)))) {
 408                                 bitstream &= ~(0x100 << j);
 409                                 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
 410                                         ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
 411                                 numbit++;
 412                                 notbitstream = ~bitstream;
 413                         }
 414                 numbit += 8;
 415                 while (numbit >= 8) {
 416                         *wp++ = bitbuf;
 417                         bitbuf >>= 8;
 418                         numbit -= 8;
 419                 }
 420         }
 421         bitbuf |= 0x7e7e << numbit;
 422         numbit += 16;
 423         while (numbit >= 8) {
 424                 *wp++ = bitbuf;
 425                 bitbuf >>= 8;
 426                 numbit -= 8;
 427         }
 428         bc->hdlctx.bufptr = bc->hdlctx.buf;
 429         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 430         dev_kfree_skb(skb);
 431         bc->stats.tx_packets++;
 432 }
 433
 434 /* ---------------------------------------------------------------------- */
 435
 436 static unsigned short random_seed;
 437
 438 static inline unsigned short random_num(void)
 439 {
 440         random_seed = 28629 * random_seed + 157;
 441         return random_seed;
 442 }
 443
 444 /* ---------------------------------------------------------------------- */
 445
 446 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 447 {
 448         struct parport *pp = bc->pdev->port;
 449         unsigned char tmp[128];
 450         int i, j;
 451
 452         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 453                 bc->hdlctx.state = tx_idle;
 454         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 455                 if (bc->hdlctx.bufcnt <= 0)
 456                         encode_hdlc(bc);
 457                 if (bc->hdlctx.bufcnt <= 0)
 458                         return 0;
 459                 if (!bc->ch_params.fulldup) {
 460                         if (!(stat & EPP_DCDBIT)) {
 461                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 462                                 return 0;
 463                         }
 464                         if ((--bc->hdlctx.slotcnt) > 0)
 465                                 return 0;
 466                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 467                         if ((random_num() % 256) > bc->ch_params.ppersist)
 468                                 return 0;
 469                 }
 470         }
 471         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 472                 bc->hdlctx.state = tx_keyup;
 473                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 474                 bc->ptt_keyed++;
 475         }
 476         while (cnt > 0) {
 477                 switch (bc->hdlctx.state) {
 478                 case tx_keyup:
 479                         i = min_t(int, cnt, bc->hdlctx.flags);
 480                         cnt -= i;
 481                         bc->hdlctx.flags -= i;
 482                         if (bc->hdlctx.flags <= 0)
 483                                 bc->hdlctx.state = tx_data;
 484                         memset(tmp, 0x7e, sizeof(tmp));
 485                         while (i > 0) {
 486                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 487                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 488                                         return -1;
 489                                 i -= j;
 490                         }
 491                         break;
 492
 493                 case tx_data:
 494                         if (bc->hdlctx.bufcnt <= 0) {
 495                                 encode_hdlc(bc);
 496                                 if (bc->hdlctx.bufcnt <= 0) {
 497                                         bc->hdlctx.state = tx_tail;
 498                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 499                                         break;
 500                                 }
 501                         }
 502                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 503                         bc->hdlctx.bufcnt -= i;
 504                         cnt -= i;
 505                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 506                                         return -1;
 507                         bc->hdlctx.bufptr += i;
 508                         break;
 509
 510                 case tx_tail:
 511                         encode_hdlc(bc);
 512                         if (bc->hdlctx.bufcnt > 0) {
 513                                 bc->hdlctx.state = tx_data;
 514                                 break;
 515                         }
 516                         i = min_t(int, cnt, bc->hdlctx.flags);
 517                         if (i) {
 518                                 cnt -= i;
 519                                 bc->hdlctx.flags -= i;
 520                                 memset(tmp, 0x7e, sizeof(tmp));
 521                                 while (i > 0) {
 522                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 523                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 524                                                 return -1;
 525                                         i -= j;
 526                                 }
 527                                 break;
 528                         }
 529
 530                 default:  /* fall through */
 531                         if (bc->hdlctx.calibrate <= 0)
 532                                 return 0;
 533                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 534                         cnt -= i;
 535                         bc->hdlctx.calibrate -= i;
 536                         memset(tmp, 0, sizeof(tmp));
 537                         while (i > 0) {
 538                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 539                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 540                                         return -1;
 541                                 i -= j;
 542                         }
 543                         break;
 544                 }
 545         }
 546         return 0;
 547 }
 548
 549 /* ---------------------------------------------------------------------- */
 550
 551 static void do_rxpacket(struct net_device *dev)
 552 {
 553         struct baycom_state *bc = netdev_priv(dev);
 554         struct sk_buff *skb;
 555         unsigned char *cp;
 556         unsigned pktlen;
 557
 558         if (bc->hdlcrx.bufcnt < 4)
 559                 return;
 560         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 561                 return;
 562         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 563         if (!(skb = dev_alloc_skb(pktlen))) {
 564                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 565                 bc->stats.rx_dropped++;
 566                 return;
 567         }
 568         cp = skb_put(skb, pktlen);
 569         *cp++ = 0; /* KISS kludge */
 570         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 571         skb->protocol = ax25_type_trans(skb, dev);
 572         netif_rx(skb);
 573         dev->last_rx = jiffies;
 574         bc->stats.rx_packets++;
 575 }
 576
 577 static int receive(struct net_device *dev, int cnt)
 578 {
 579         struct baycom_state *bc = netdev_priv(dev);
 580         struct parport *pp = bc->pdev->port;
 581         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 582         unsigned char tmp[128];
 583         unsigned char *cp;
 584         int cnt2, ret = 0;
 585         int j;
 586
 587         numbits = bc->hdlcrx.numbits;
 588         state = bc->hdlcrx.state;
 589         bitstream = bc->hdlcrx.bitstream;
 590         bitbuf = bc->hdlcrx.bitbuf;
 591         while (cnt > 0) {
 592                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 593                 cnt -= cnt2;
 594                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 595                         ret = -1;
 596                         break;
 597                 }
 598                 cp = tmp;
 599                 for (; cnt2 > 0; cnt2--, cp++) {
 600                         bitstream >>= 8;
 601                         bitstream |= (*cp) << 8;
 602                         bitbuf >>= 8;
 603                         bitbuf |= (*cp) << 8;
 604                         numbits += 8;
 605                         notbitstream = ~bitstream;
 606                         for (j = 0; j < 8; j++) {
 607
 608                                 /* flag or abort */
 609                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
 610
 611                                         /* abort received */
 612                                         if (!(notbitstream & (0x1fc << j)))
 613                                                 state = 0;
 614
 615                                         /* not flag received */
 616                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
 617                                                 if (state)
 618                                                         do_rxpacket(dev);
 619                                                 bc->hdlcrx.bufcnt = 0;
 620                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
 621                                                 state = 1;
 622                                                 numbits = 7-j;
 623                                                 }
 624                                         }
 625
 626                                 /* stuffed bit */
 627                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
 628                                         numbits--;
 629                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
 630                                         }
 631                                 }
 632                         while (state && numbits >= 8) {
 633                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 634                                         state = 0;
 635                                 } else {
 636                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 637                                         bc->hdlcrx.bufcnt++;
 638                                         numbits -= 8;
 639                                 }
 640                         }
 641                 }
 642         }
 643         bc->hdlcrx.numbits = numbits;
 644         bc->hdlcrx.state = state;
 645         bc->hdlcrx.bitstream = bitstream;
 646         bc->hdlcrx.bitbuf = bitbuf;
 647         return ret;
 648 }
 649
 650 /* --------------------------------------------------------------------- */
 651
 652 #ifdef __i386__
 653 #include <asm/msr.h>
 654 #define GETTICK(x)                                                \
 655 ({                                                                \
 656         if (cpu_has_tsc)                                          \
 657                 rdtscl(x);                                        \
 658 })
 659 #else /* __i386__ */
 660 #define GETTICK(x)
 661 #endif /* __i386__ */
 662
 663 static void epp_bh(struct work_struct *work)
 664 {
 665         struct net_device *dev;
 666         struct baycom_state *bc;
 667         struct parport *pp;
 668         unsigned char stat;
 669         unsigned char tmp[2];
 670         unsigned int time1 = 0, time2 = 0, time3 = 0;
 671         int cnt, cnt2;
 672
 673         bc = container_of(work, struct baycom_state, run_work.work);
 674         dev = bc->dev;
 675         if (!bc->work_running)
 676                 return;
 677         baycom_int_freq(bc);
 678         pp = bc->pdev->port;
 679         /* update status */
 680         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 681                 goto epptimeout;
 682         bc->stat = stat;
 683         bc->debug_vals.last_pllcorr = stat;
 684         GETTICK(time1);
 685         if (bc->modem == EPP_FPGAEXTSTATUS) {
 686                 /* get input count */
 687                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 688                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 689                         goto epptimeout;
 690                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 691                         goto epptimeout;
 692                 cnt = tmp[0] | (tmp[1] << 8);
 693                 cnt &= 0x7fff;
 694                 /* get output count */
 695                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 696                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 697                         goto epptimeout;
 698                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 699                         goto epptimeout;
 700                 cnt2 = tmp[0] | (tmp[1] << 8);
 701                 cnt2 = 16384 - (cnt2 & 0x7fff);
 702                 /* return to normal */
 703                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 704                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 705                         goto epptimeout;
 706                 if (transmit(bc, cnt2, stat))
 707                         goto epptimeout;
 708                 GETTICK(time2);
 709                 if (receive(dev, cnt))
 710                         goto epptimeout;
 711                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 712                         goto epptimeout;
 713                 bc->stat = stat;
 714         } else {
 715                 /* try to tx */
 716                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 717                 case EPP_NTHF:
 718                         cnt = 2048 - 256;
 719                         break;
 720
 721                 case EPP_NTAEF:
 722                         cnt = 2048 - 1793;
 723                         break;
 724
 725                 case 0:
 726                         cnt = 0;
 727                         break;
 728
 729                 default:
 730                         cnt = 2048 - 1025;
 731                         break;
 732                 }
 733                 if (transmit(bc, cnt, stat))
 734                         goto epptimeout;
 735                 GETTICK(time2);
 736                 /* do receiver */
 737                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 738                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 739                         case EPP_NRAEF:
 740                                 cnt = 1025;
 741                                 break;
 742
 743                         case 0:
 744                                 cnt = 1793;
 745                                 break;
 746
 747                         default:
 748                                 cnt = 256;
 749                                 break;
 750                         }
 751                         if (receive(dev, cnt))
 752                                 goto epptimeout;
 753                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 754                                 goto epptimeout;
 755                 }
 756                 cnt = 0;
 757                 if (bc->bitrate < 50000)
 758                         cnt = 256;
 759                 else if (bc->bitrate < 100000)
 760                         cnt = 128;
 761                 while (cnt > 0 && stat & EPP_NREF) {
 762                         if (receive(dev, 1))
 763                                 goto epptimeout;
 764                         cnt--;
 765                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 766                                 goto epptimeout;
 767                 }
 768         }
 769         GETTICK(time3);
 770 #ifdef BAYCOM_DEBUG
 771         bc->debug_vals.mod_cycles = time2 - time1;
 772         bc->debug_vals.demod_cycles = time3 - time2;
 773 #endif /* BAYCOM_DEBUG */
 774         schedule_delayed_work(&bc->run_work, 1);
 775         if (!bc->skb)
 776                 netif_wake_queue(dev);
 777         return;
 778  epptimeout:
 779         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 780 }
 781
 782 /* ---------------------------------------------------------------------- */
 783 /*
 784  * ===================== network driver interface =========================
 785  */
 786
 787 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 788 {
 789         struct baycom_state *bc = netdev_priv(dev);
 790
 791         if (skb->data[0] != 0) {
 792                 do_kiss_params(bc, skb->data, skb->len);
 793                 dev_kfree_skb(skb);
 794                 return 0;
 795         }
 796         if (bc->skb)
 797                 return -1;
 798         /* strip KISS byte */
 799         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 800                 dev_kfree_skb(skb);
 801                 return 0;
 802         }
 803         netif_stop_queue(dev);
 804         bc->skb = skb;
 805         return 0;
 806 }
 807
 808 /* --------------------------------------------------------------------- */
 809
 810 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 811 {
 812         struct sockaddr *sa = (struct sockaddr *)addr;
 813
 814         /* addr is an AX.25 shifted ASCII mac address */
 815         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 816         return 0;
 817 }
 818
 819 /* --------------------------------------------------------------------- */
 820
 821 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
 822 {
 823         struct baycom_state *bc = netdev_priv(dev);
 824
 825         /*
 826          * Get the current statistics.  This may be called with the
 827          * card open or closed.
 828          */
 829         return &bc->stats;
 830 }
 831
 832 /* --------------------------------------------------------------------- */
 833
 834 static void epp_wakeup(void *handle)
 835 {
 836         struct net_device *dev = (struct net_device *)handle;
 837         struct baycom_state *bc = netdev_priv(dev);
 838
 839         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 840         if (!parport_claim(bc->pdev))
 841                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 842 }
 843
 844 /* --------------------------------------------------------------------- */
 845
 846 /*
 847  * Open/initialize the board. This is called (in the current kernel)
 848  * sometime after booting when the 'ifconfig' program is run.
 849  *
 850  * This routine should set everything up anew at each open, even
 851  * registers that "should" only need to be set once at boot, so that
 852  * there is non-reboot way to recover if something goes wrong.
 853  */
 854
 855 static int epp_open(struct net_device *dev)
 856 {
 857         struct baycom_state *bc = netdev_priv(dev);
 858         struct parport *pp = parport_find_base(dev->base_addr);
 859         unsigned int i, j;
 860         unsigned char tmp[128];
 861         unsigned char stat;
 862         unsigned long tstart;
 863
 864         if (!pp) {
 865                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 866                 return -ENXIO;
 867         }
 868 #if 0
 869         if (pp->irq < 0) {
 870                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 871                 parport_put_port(pp);
 872                 return -ENXIO;
 873         }
 874 #endif
 875         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 876                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 877                        bc_drvname, pp->base);
 878                 parport_put_port(pp);
 879                 return -EIO;
 880         }
 881         memset(&bc->modem, 0, sizeof(bc->modem));
 882         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
 883                                         epp_interrupt, PARPORT_DEV_EXCL, dev);
 884         parport_put_port(pp);
 885         if (!bc->pdev) {
 886                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 887                 return -ENXIO;
 888         }
 889         if (parport_claim(bc->pdev)) {
 890                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 891                 parport_unregister_device(bc->pdev);
 892                 return -EBUSY;
 893         }
 894         dev->irq = /*pp->irq*/ 0;
 895         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
 896         bc->work_running = 1;
 897         bc->modem = EPP_CONVENTIONAL;
 898         if (eppconfig(bc))
 899                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 900         else
 901                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 902         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 903         /* reset the modem */
 904         tmp[0] = 0;
 905         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 906         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 907                 goto epptimeout;
 908         /* autoprobe baud rate */
 909         tstart = jiffies;
 910         i = 0;
 911         while (time_before(jiffies, tstart + HZ/3)) {
 912                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 913                         goto epptimeout;
 914                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 915                         schedule();
 916                         continue;
 917                 }
 918                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 919                         goto epptimeout;
 920                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 921                         goto epptimeout;
 922                 i += 256;
 923         }
 924         for (j = 0; j < 256; j++) {
 925                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 926                         goto epptimeout;
 927                 if (!(stat & EPP_NREF))
 928                         break;
 929                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 930                         goto epptimeout;
 931                 i++;
 932         }
 933         tstart = jiffies - tstart;
 934         bc->bitrate = i * (8 * HZ) / tstart;
 935         j = 1;
 936         i = bc->bitrate >> 3;
 937         while (j < 7 && i > 150) {
 938                 j++;
 939                 i >>= 1;
 940         }
 941         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 942                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 943         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
 944         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 945                 goto epptimeout;
 946         /*
 947          * initialise hdlc variables
 948          */
 949         bc->hdlcrx.state = 0;
 950         bc->hdlcrx.numbits = 0;
 951         bc->hdlctx.state = tx_idle;
 952         bc->hdlctx.bufcnt = 0;
 953         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 954         bc->hdlctx.calibrate = 0;
 955         /* start the bottom half stuff */
 956         schedule_delayed_work(&bc->run_work, 1);
 957         netif_start_queue(dev);
 958         return 0;
 959
 960  epptimeout:
 961         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
 962         parport_write_control(pp, 0); /* reset the adapter */
 963         parport_release(bc->pdev);
 964         parport_unregister_device(bc->pdev);
 965         return -EIO;
 966 }
 967
 968 /* --------------------------------------------------------------------- */
 969
 970 static int epp_close(struct net_device *dev)
 971 {
 972         struct baycom_state *bc = netdev_priv(dev);
 973         struct parport *pp = bc->pdev->port;
 974         unsigned char tmp[1];
 975
 976         bc->work_running = 0;
 977         flush_scheduled_work();
 978         bc->stat = EPP_DCDBIT;
 979         tmp[0] = 0;
 980         pp->ops->epp_write_addr(pp, tmp, 1, 0);
 981         parport_write_control(pp, 0); /* reset the adapter */
 982         parport_release(bc->pdev);
 983         parport_unregister_device(bc->pdev);
 984         if (bc->skb)
 985                 dev_kfree_skb(bc->skb);
 986         bc->skb = NULL;
 987         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 988                bc_drvname, dev->base_addr, dev->irq);
 989         return 0;
 990 }
 991
 992 /* --------------------------------------------------------------------- */
 993
 994 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 995 {
 996         const char *cp;
 997
 998         if (strstr(modestr,"intclk"))
 999                 bc->cfg.intclk = 1;
1000         if (strstr(modestr,"extclk"))
1001                 bc->cfg.intclk = 0;
1002         if (strstr(modestr,"intmodem"))
1003                 bc->cfg.extmodem = 0;
1004         if (strstr(modestr,"extmodem"))
1005                 bc->cfg.extmodem = 1;
1006         if (strstr(modestr,"noloopback"))
1007                 bc->cfg.loopback = 0;
1008         if (strstr(modestr,"loopback"))
1009                 bc->cfg.loopback = 1;
1010         if ((cp = strstr(modestr,"fclk="))) {
1011                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1012                 if (bc->cfg.fclk < 1000000)
1013                         bc->cfg.fclk = 1000000;
1014                 if (bc->cfg.fclk > 25000000)
1015                         bc->cfg.fclk = 25000000;
1016         }
1017         if ((cp = strstr(modestr,"bps="))) {
1018                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1019                 if (bc->cfg.bps < 1000)
1020                         bc->cfg.bps = 1000;
1021                 if (bc->cfg.bps > 1500000)
1022                         bc->cfg.bps = 1500000;
1023         }
1024         return 0;
1025 }
1026
1027 /* --------------------------------------------------------------------- */
1028
1029 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1030 {
1031         struct baycom_state *bc = netdev_priv(dev);
1032         struct hdlcdrv_ioctl hi;
1033
1034         if (cmd != SIOCDEVPRIVATE)
1035                 return -ENOIOCTLCMD;
1036
1037         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1038                 return -EFAULT;
1039         switch (hi.cmd) {
1040         default:
1041                 return -ENOIOCTLCMD;
1042
1043         case HDLCDRVCTL_GETCHANNELPAR:
1044                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1045                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1046                 hi.data.cp.slottime = bc->ch_params.slottime;
1047                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1048                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1049                 break;
1050
1051         case HDLCDRVCTL_SETCHANNELPAR:
1052                 if (!capable(CAP_NET_ADMIN))
1053                         return -EACCES;
1054                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1055                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1056                 bc->ch_params.slottime = hi.data.cp.slottime;
1057                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1058                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1059                 bc->hdlctx.slotcnt = 1;
1060                 return 0;
1061
1062         case HDLCDRVCTL_GETMODEMPAR:
1063                 hi.data.mp.iobase = dev->base_addr;
1064                 hi.data.mp.irq = dev->irq;
1065                 hi.data.mp.dma = dev->dma;
1066                 hi.data.mp.dma2 = 0;
1067                 hi.data.mp.seriobase = 0;
1068                 hi.data.mp.pariobase = 0;
1069                 hi.data.mp.midiiobase = 0;
1070                 break;
1071
1072         case HDLCDRVCTL_SETMODEMPAR:
1073                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1074                         return -EACCES;
1075                 dev->base_addr = hi.data.mp.iobase;
1076                 dev->irq = /*hi.data.mp.irq*/0;
1077                 dev->dma = /*hi.data.mp.dma*/0;
1078                 return 0;
1079
1080         case HDLCDRVCTL_GETSTAT:
1081                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1082                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1083                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1084                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1085                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1086                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1087                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1088                 break;
1089
1090         case HDLCDRVCTL_OLDGETSTAT:
1091                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1092                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1093                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1094                 break;
1095
1096         case HDLCDRVCTL_CALIBRATE:
1097                 if (!capable(CAP_SYS_RAWIO))
1098                         return -EACCES;
1099                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1100                 return 0;
1101
1102         case HDLCDRVCTL_DRIVERNAME:
1103                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1104                 break;
1105
1106         case HDLCDRVCTL_GETMODE:
1107                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1108                         bc->cfg.intclk ? "int" : "ext",
1109                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1110                         bc->cfg.loopback ? ",loopback" : "");
1111                 break;
1112
1113         case HDLCDRVCTL_SETMODE:
1114                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1115                         return -EACCES;
1116                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1117                 return baycom_setmode(bc, hi.data.modename);
1118
1119         case HDLCDRVCTL_MODELIST:
1120                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1121                         sizeof(hi.data.modename));
1122                 break;
1123
1124         case HDLCDRVCTL_MODEMPARMASK:
1125                 return HDLCDRV_PARMASK_IOBASE;
1126
1127         }
1128         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1129                 return -EFAULT;
1130         return 0;
1131 }
1132
1133 /* --------------------------------------------------------------------- */
1134
1135 /*
1136  * Check for a network adaptor of this type, and return '0' if one exists.
1137  * If dev->base_addr == 0, probe all likely locations.
1138  * If dev->base_addr == 1, always return failure.
1139  * If dev->base_addr == 2, allocate space for the device and return success
1140  * (detachable devices only).
1141  */
1142 static void baycom_probe(struct net_device *dev)
1143 {
1144         const struct hdlcdrv_channel_params dflt_ch_params = {
1145                 20, 2, 10, 40, 0
1146         };
1147         struct baycom_state *bc;
1148
1149         /*
1150          * not a real probe! only initialize data structures
1151          */
1152         bc = netdev_priv(dev);
1153         /*
1154          * initialize the baycom_state struct
1155          */
1156         bc->ch_params = dflt_ch_params;
1157         bc->ptt_keyed = 0;
1158
1159         /*
1160          * initialize the device struct
1161          */
1162         dev->open = epp_open;
1163         dev->stop = epp_close;
1164         dev->do_ioctl = baycom_ioctl;
1165         dev->hard_start_xmit = baycom_send_packet;
1166         dev->get_stats = baycom_get_stats;
1167
1168         /* Fill in the fields of the device structure */
1169         bc->skb = NULL;
1170
1171         dev->hard_header = ax25_hard_header;
1172         dev->rebuild_header = ax25_rebuild_header;
1173         dev->set_mac_address = baycom_set_mac_address;
1174
1175         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1176         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1177         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1178         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1179         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1180         memcpy(dev->dev_addr, &ax25_nocall, AX25_ADDR_LEN);
1181         dev->tx_queue_len = 16;
1182
1183         /* New style flags */
1184         dev->flags = 0;
1185 }
1186
1187 /* --------------------------------------------------------------------- */
1188
1189 /*
1190  * command line settable parameters
1191  */
1192 static const char *mode[NR_PORTS] = { "", };
1193 static int iobase[NR_PORTS] = { 0x378, };
1194
1195 module_param_array(mode, charp, NULL, 0);
1196 MODULE_PARM_DESC(mode, "baycom operating mode");
1197 module_param_array(iobase, int, NULL, 0);
1198 MODULE_PARM_DESC(iobase, "baycom io base address");
1199
1200 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1201 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1202 MODULE_LICENSE("GPL");
1203
1204 /* --------------------------------------------------------------------- */
1205
1206 static void __init baycom_epp_dev_setup(struct net_device *dev)
1207 {
1208         struct baycom_state *bc = netdev_priv(dev);
1209
1210         /*
1211          * initialize part of the baycom_state struct
1212          */
1213         bc->dev = dev;
1214         bc->magic = BAYCOM_MAGIC;
1215         bc->cfg.fclk = 19666600;
1216         bc->cfg.bps = 9600;
1217         /*
1218          * initialize part of the device struct
1219          */
1220         baycom_probe(dev);
1221 }
1222
1223 static int __init init_baycomepp(void)
1224 {
1225         int i, found = 0;
1226         char set_hw = 1;
1227
1228         printk(bc_drvinfo);
1229         /*
1230          * register net devices
1231          */
1232         for (i = 0; i < NR_PORTS; i++) {
1233                 struct net_device *dev;
1234
1235                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1236                                    baycom_epp_dev_setup);
1237
1238                 if (!dev) {
1239                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1240                         return found ? 0 : -ENOMEM;
1241                 }
1242
1243                 sprintf(dev->name, "bce%d", i);
1244                 dev->base_addr = iobase[i];
1245
1246                 if (!mode[i])
1247                         set_hw = 0;
1248                 if (!set_hw)
1249                         iobase[i] = 0;
1250
1251                 if (register_netdev(dev)) {
1252                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1253                         free_netdev(dev);
1254                         break;
1255                 }
1256                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1257                         set_hw = 0;
1258                 baycom_device[i] = dev;
1259                 found++;
1260         }
1261
1262         return found ? 0 : -ENXIO;
1263 }
1264
1265 static void __exit cleanup_baycomepp(void)
1266 {
1267         int i;
1268
1269         for(i = 0; i < NR_PORTS; i++) {
1270                 struct net_device *dev = baycom_device[i];
1271
1272                 if (dev) {
1273                         struct baycom_state *bc = netdev_priv(dev);
1274                         if (bc->magic == BAYCOM_MAGIC) {
1275                                 unregister_netdev(dev);
1276                                 free_netdev(dev);
1277                         } else
1278                                 printk(paranoia_str, "cleanup_module");
1279                 }
1280         }
1281 }
1282
1283 module_init(init_baycomepp);
1284 module_exit(cleanup_baycomepp);
1285
1286 /* --------------------------------------------------------------------- */
1287
1288 #ifndef MODULE
1289
1290 /*
1291  * format: baycom_epp=io,mode
1292  * mode: fpga config options
1293  */
1294
1295 static int __init baycom_epp_setup(char *str)
1296 {
1297         static unsigned __initdata nr_dev = 0;
1298         int ints[2];
1299
1300         if (nr_dev >= NR_PORTS)
1301                 return 0;
1302         str = get_options(str, 2, ints);
1303         if (ints[0] < 1)
1304                 return 0;
1305         mode[nr_dev] = str;
1306         iobase[nr_dev] = ints[1];
1307         nr_dev++;
1308         return 1;
1309 }
1310
1311 __setup("baycom_epp=", baycom_epp_setup);
1312
1313 #endif /* MODULE */
1314 /* --------------------------------------------------------------------- */