git.oblomov.eu Git - linux-2.6/blob - 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         unsigned int work_running;
 172         struct work_struct run_work;
 173         unsigned int modem;
 174         unsigned int bitrate;
 175         unsigned char stat;
 176
 177         struct {
 178                 unsigned int intclk;
 179                 unsigned int fclk;
 180                 unsigned int bps;
 181                 unsigned int extmodem;
 182                 unsigned int loopback;
 183         } cfg;
 184
 185         struct hdlcdrv_channel_params ch_params;
 186
 187         struct {
 188                 unsigned int bitbuf, bitstream, numbits, state;
 189                 unsigned char *bufptr;
 190                 int bufcnt;
 191                 unsigned char buf[TXBUFFER_SIZE];
 192         } hdlcrx;
 193
 194         struct {
 195                 int calibrate;
 196                 int slotcnt;
 197                 int flags;
 198                 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
 199                 unsigned char *bufptr;
 200                 int bufcnt;
 201                 unsigned char buf[TXBUFFER_SIZE];
 202         } hdlctx;
 203
 204         struct net_device_stats stats;
 205         unsigned int ptt_keyed;
 206         struct sk_buff *skb;  /* next transmit packet  */
 207
 208 #ifdef BAYCOM_DEBUG
 209         struct debug_vals {
 210                 unsigned long last_jiffies;
 211                 unsigned cur_intcnt;
 212                 unsigned last_intcnt;
 213                 int cur_pllcorr;
 214                 int last_pllcorr;
 215                 unsigned int mod_cycles;
 216                 unsigned int demod_cycles;
 217         } debug_vals;
 218 #endif /* BAYCOM_DEBUG */
 219 };
 220
 221 /* --------------------------------------------------------------------- */
 222
 223 #define KISS_VERBOSE
 224
 225 /* --------------------------------------------------------------------- */
 226
 227 #define PARAM_TXDELAY   1
 228 #define PARAM_PERSIST   2
 229 #define PARAM_SLOTTIME  3
 230 #define PARAM_TXTAIL    4
 231 #define PARAM_FULLDUP   5
 232 #define PARAM_HARDWARE  6
 233 #define PARAM_RETURN    255
 234
 235 /* --------------------------------------------------------------------- */
 236 /*
 237  * the CRC routines are stolen from WAMPES
 238  * by Dieter Deyke
 239  */
 240
 241
 242 /*---------------------------------------------------------------------------*/
 243
 244 #if 0
 245 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 246 {
 247         unsigned int crc = 0xffff;
 248
 249         for (;len>0;len--)
 250                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
 251         crc ^= 0xffff;
 252         *buffer++ = crc;
 253         *buffer++ = crc >> 8;
 254 }
 255 #endif
 256
 257 /*---------------------------------------------------------------------------*/
 258
 259 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 260 {
 261         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 262 }
 263
 264 /*---------------------------------------------------------------------------*/
 265
 266 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
 267 {
 268         return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
 269 }
 270
 271 /* ---------------------------------------------------------------------- */
 272
 273 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
 274
 275 /* --------------------------------------------------------------------- */
 276
 277 static inline void baycom_int_freq(struct baycom_state *bc)
 278 {
 279 #ifdef BAYCOM_DEBUG
 280         unsigned long cur_jiffies = jiffies;
 281         /*
 282          * measure the interrupt frequency
 283          */
 284         bc->debug_vals.cur_intcnt++;
 285         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 286                 bc->debug_vals.last_jiffies = cur_jiffies;
 287                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 288                 bc->debug_vals.cur_intcnt = 0;
 289                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 290                 bc->debug_vals.cur_pllcorr = 0;
 291         }
 292 #endif /* BAYCOM_DEBUG */
 293 }
 294
 295 /* ---------------------------------------------------------------------- */
 296 /*
 297  *    eppconfig_path should be setable  via /proc/sys.
 298  */
 299
 300 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
 301
 302 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 303
 304 /* eppconfig: called during ifconfig up to configure the modem */
 305 static int eppconfig(struct baycom_state *bc)
 306 {
 307         char modearg[256];
 308         char portarg[16];
 309         char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
 310                          NULL };
 311
 312         /* set up arguments */
 313         sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
 314                 bc->cfg.intclk ? "int" : "ext",
 315                 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
 316                 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
 317                 bc->cfg.loopback ? ",loopback" : "");
 318         sprintf(portarg, "%ld", bc->pdev->port->base);
 319         printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
 320
 321         return call_usermodehelper(eppconfig_path, argv, envp, 1);
 322 }
 323
 324 /* ---------------------------------------------------------------------- */
 325
 326 static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 327 {
 328 }
 329
 330 /* ---------------------------------------------------------------------- */
 331
 332 static inline void do_kiss_params(struct baycom_state *bc,
 333                                   unsigned char *data, unsigned long len)
 334 {
 335
 336 #ifdef KISS_VERBOSE
 337 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 338 #else /* KISS_VERBOSE */
 339 #define PKP(a,b)
 340 #endif /* KISS_VERBOSE */
 341
 342         if (len < 2)
 343                 return;
 344         switch(data[0]) {
 345         case PARAM_TXDELAY:
 346                 bc->ch_params.tx_delay = data[1];
 347                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 348                 break;
 349         case PARAM_PERSIST:
 350                 bc->ch_params.ppersist = data[1];
 351                 PKP("p persistence = %u", bc->ch_params.ppersist);
 352                 break;
 353         case PARAM_SLOTTIME:
 354                 bc->ch_params.slottime = data[1];
 355                 PKP("slot time = %ums", bc->ch_params.slottime);
 356                 break;
 357         case PARAM_TXTAIL:
 358                 bc->ch_params.tx_tail = data[1];
 359                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 360                 break;
 361         case PARAM_FULLDUP:
 362                 bc->ch_params.fulldup = !!data[1];
 363                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 364                 break;
 365         default:
 366                 break;
 367         }
 368 #undef PKP
 369 }
 370
 371 /* --------------------------------------------------------------------- */
 372
 373 static void encode_hdlc(struct baycom_state *bc)
 374 {
 375         struct sk_buff *skb;
 376         unsigned char *wp, *bp;
 377         int pkt_len;
 378         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 379         unsigned char crcarr[2];
 380         int j;
 381
 382         if (bc->hdlctx.bufcnt > 0)
 383                 return;
 384         skb = bc->skb;
 385         if (!skb)
 386                 return;
 387         bc->skb = NULL;
 388         pkt_len = skb->len-1; /* strip KISS byte */
 389         wp = bc->hdlctx.buf;
 390         bp = skb->data+1;
 391         crc = calc_crc_ccitt(bp, pkt_len);
 392         crcarr[0] = crc;
 393         crcarr[1] = crc >> 8;
 394         *wp++ = 0x7e;
 395         bitstream = bitbuf = numbit = 0;
 396         while (pkt_len > -2) {
 397                 bitstream >>= 8;
 398                 bitstream |= ((unsigned int)*bp) << 8;
 399                 bitbuf |= ((unsigned int)*bp) << numbit;
 400                 notbitstream = ~bitstream;
 401                 bp++;
 402                 pkt_len--;
 403                 if (!pkt_len)
 404                         bp = crcarr;
 405                 for (j = 0; j < 8; j++)
 406                         if (unlikely(!(notbitstream & (0x1f0 << j)))) {
 407                                 bitstream &= ~(0x100 << j);
 408                                 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
 409                                         ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
 410                                 numbit++;
 411                                 notbitstream = ~bitstream;
 412                         }
 413                 numbit += 8;
 414                 while (numbit >= 8) {
 415                         *wp++ = bitbuf;
 416                         bitbuf >>= 8;
 417                         numbit -= 8;
 418                 }
 419         }
 420         bitbuf |= 0x7e7e << numbit;
 421         numbit += 16;
 422         while (numbit >= 8) {
 423                 *wp++ = bitbuf;
 424                 bitbuf >>= 8;
 425                 numbit -= 8;
 426         }
 427         bc->hdlctx.bufptr = bc->hdlctx.buf;
 428         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 429         dev_kfree_skb(skb);
 430         bc->stats.tx_packets++;
 431 }
 432
 433 /* ---------------------------------------------------------------------- */
 434
 435 static unsigned short random_seed;
 436
 437 static inline unsigned short random_num(void)
 438 {
 439         random_seed = 28629 * random_seed + 157;
 440         return random_seed;
 441 }
 442
 443 /* ---------------------------------------------------------------------- */
 444
 445 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 446 {
 447         struct parport *pp = bc->pdev->port;
 448         unsigned char tmp[128];
 449         int i, j;
 450
 451         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 452                 bc->hdlctx.state = tx_idle;
 453         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 454                 if (bc->hdlctx.bufcnt <= 0)
 455                         encode_hdlc(bc);
 456                 if (bc->hdlctx.bufcnt <= 0)
 457                         return 0;
 458                 if (!bc->ch_params.fulldup) {
 459                         if (!(stat & EPP_DCDBIT)) {
 460                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 461                                 return 0;
 462                         }
 463                         if ((--bc->hdlctx.slotcnt) > 0)
 464                                 return 0;
 465                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 466                         if ((random_num() % 256) > bc->ch_params.ppersist)
 467                                 return 0;
 468                 }
 469         }
 470         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 471                 bc->hdlctx.state = tx_keyup;
 472                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 473                 bc->ptt_keyed++;
 474         }
 475         while (cnt > 0) {
 476                 switch (bc->hdlctx.state) {
 477                 case tx_keyup:
 478                         i = min_t(int, cnt, bc->hdlctx.flags);
 479                         cnt -= i;
 480                         bc->hdlctx.flags -= i;
 481                         if (bc->hdlctx.flags <= 0)
 482                                 bc->hdlctx.state = tx_data;
 483                         memset(tmp, 0x7e, sizeof(tmp));
 484                         while (i > 0) {
 485                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 486                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 487                                         return -1;
 488                                 i -= j;
 489                         }
 490                         break;
 491
 492                 case tx_data:
 493                         if (bc->hdlctx.bufcnt <= 0) {
 494                                 encode_hdlc(bc);
 495                                 if (bc->hdlctx.bufcnt <= 0) {
 496                                         bc->hdlctx.state = tx_tail;
 497                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 498                                         break;
 499                                 }
 500                         }
 501                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 502                         bc->hdlctx.bufcnt -= i;
 503                         cnt -= i;
 504                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 505                                         return -1;
 506                         bc->hdlctx.bufptr += i;
 507                         break;
 508
 509                 case tx_tail:
 510                         encode_hdlc(bc);
 511                         if (bc->hdlctx.bufcnt > 0) {
 512                                 bc->hdlctx.state = tx_data;
 513                                 break;
 514                         }
 515                         i = min_t(int, cnt, bc->hdlctx.flags);
 516                         if (i) {
 517                                 cnt -= i;
 518                                 bc->hdlctx.flags -= i;
 519                                 memset(tmp, 0x7e, sizeof(tmp));
 520                                 while (i > 0) {
 521                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 522                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 523                                                 return -1;
 524                                         i -= j;
 525                                 }
 526                                 break;
 527                         }
 528
 529                 default:  /* fall through */
 530                         if (bc->hdlctx.calibrate <= 0)
 531                                 return 0;
 532                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 533                         cnt -= i;
 534                         bc->hdlctx.calibrate -= i;
 535                         memset(tmp, 0, sizeof(tmp));
 536                         while (i > 0) {
 537                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 538                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 539                                         return -1;
 540                                 i -= j;
 541                         }
 542                         break;
 543                 }
 544         }
 545         return 0;
 546 }
 547
 548 /* ---------------------------------------------------------------------- */
 549
 550 static void do_rxpacket(struct net_device *dev)
 551 {
 552         struct baycom_state *bc = netdev_priv(dev);
 553         struct sk_buff *skb;
 554         unsigned char *cp;
 555         unsigned pktlen;
 556
 557         if (bc->hdlcrx.bufcnt < 4)
 558                 return;
 559         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 560                 return;
 561         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 562         if (!(skb = dev_alloc_skb(pktlen))) {
 563                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 564                 bc->stats.rx_dropped++;
 565                 return;
 566         }
 567         cp = skb_put(skb, pktlen);
 568         *cp++ = 0; /* KISS kludge */
 569         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 570         skb->protocol = ax25_type_trans(skb, dev);
 571         netif_rx(skb);
 572         dev->last_rx = jiffies;
 573         bc->stats.rx_packets++;
 574 }
 575
 576 static int receive(struct net_device *dev, int cnt)
 577 {
 578         struct baycom_state *bc = netdev_priv(dev);
 579         struct parport *pp = bc->pdev->port;
 580         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 581         unsigned char tmp[128];
 582         unsigned char *cp;
 583         int cnt2, ret = 0;
 584         int j;
 585
 586         numbits = bc->hdlcrx.numbits;
 587         state = bc->hdlcrx.state;
 588         bitstream = bc->hdlcrx.bitstream;
 589         bitbuf = bc->hdlcrx.bitbuf;
 590         while (cnt > 0) {
 591                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 592                 cnt -= cnt2;
 593                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 594                         ret = -1;
 595                         break;
 596                 }
 597                 cp = tmp;
 598                 for (; cnt2 > 0; cnt2--, cp++) {
 599                         bitstream >>= 8;
 600                         bitstream |= (*cp) << 8;
 601                         bitbuf >>= 8;
 602                         bitbuf |= (*cp) << 8;
 603                         numbits += 8;
 604                         notbitstream = ~bitstream;
 605                         for (j = 0; j < 8; j++) {
 606
 607                                 /* flag or abort */
 608                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
 609
 610                                         /* abort received */
 611                                         if (!(notbitstream & (0x1fc << j)))
 612                                                 state = 0;
 613
 614                                         /* not flag received */
 615                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
 616                                                 if (state)
 617                                                         do_rxpacket(dev);
 618                                                 bc->hdlcrx.bufcnt = 0;
 619                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
 620                                                 state = 1;
 621                                                 numbits = 7-j;
 622                                                 }
 623                                         }
 624
 625                                 /* stuffed bit */
 626                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
 627                                         numbits--;
 628                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
 629                                         }
 630                                 }
 631                         while (state && numbits >= 8) {
 632                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 633                                         state = 0;
 634                                 } else {
 635                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 636                                         bc->hdlcrx.bufcnt++;
 637                                         numbits -= 8;
 638                                 }
 639                         }
 640                 }
 641         }
 642         bc->hdlcrx.numbits = numbits;
 643         bc->hdlcrx.state = state;
 644         bc->hdlcrx.bitstream = bitstream;
 645         bc->hdlcrx.bitbuf = bitbuf;
 646         return ret;
 647 }
 648
 649 /* --------------------------------------------------------------------- */
 650
 651 #ifdef __i386__
 652 #include <asm/msr.h>
 653 #define GETTICK(x)                                                \
 654 ({                                                                \
 655         if (cpu_has_tsc)                                          \
 656                 rdtscl(x);                                        \
 657 })
 658 #else /* __i386__ */
 659 #define GETTICK(x)
 660 #endif /* __i386__ */
 661
 662 static void epp_bh(struct net_device *dev)
 663 {
 664         struct baycom_state *bc;
 665         struct parport *pp;
 666         unsigned char stat;
 667         unsigned char tmp[2];
 668         unsigned int time1 = 0, time2 = 0, time3 = 0;
 669         int cnt, cnt2;
 670
 671         bc = netdev_priv(dev);
 672         if (!bc->work_running)
 673                 return;
 674         baycom_int_freq(bc);
 675         pp = bc->pdev->port;
 676         /* update status */
 677         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 678                 goto epptimeout;
 679         bc->stat = stat;
 680         bc->debug_vals.last_pllcorr = stat;
 681         GETTICK(time1);
 682         if (bc->modem == EPP_FPGAEXTSTATUS) {
 683                 /* get input count */
 684                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 685                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 686                         goto epptimeout;
 687                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 688                         goto epptimeout;
 689                 cnt = tmp[0] | (tmp[1] << 8);
 690                 cnt &= 0x7fff;
 691                 /* get output count */
 692                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 693                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 694                         goto epptimeout;
 695                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 696                         goto epptimeout;
 697                 cnt2 = tmp[0] | (tmp[1] << 8);
 698                 cnt2 = 16384 - (cnt2 & 0x7fff);
 699                 /* return to normal */
 700                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 701                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 702                         goto epptimeout;
 703                 if (transmit(bc, cnt2, stat))
 704                         goto epptimeout;
 705                 GETTICK(time2);
 706                 if (receive(dev, cnt))
 707                         goto epptimeout;
 708                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 709                         goto epptimeout;
 710                 bc->stat = stat;
 711         } else {
 712                 /* try to tx */
 713                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 714                 case EPP_NTHF:
 715                         cnt = 2048 - 256;
 716                         break;
 717
 718                 case EPP_NTAEF:
 719                         cnt = 2048 - 1793;
 720                         break;
 721
 722                 case 0:
 723                         cnt = 0;
 724                         break;
 725
 726                 default:
 727                         cnt = 2048 - 1025;
 728                         break;
 729                 }
 730                 if (transmit(bc, cnt, stat))
 731                         goto epptimeout;
 732                 GETTICK(time2);
 733                 /* do receiver */
 734                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 735                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 736                         case EPP_NRAEF:
 737                                 cnt = 1025;
 738                                 break;
 739
 740                         case 0:
 741                                 cnt = 1793;
 742                                 break;
 743
 744                         default:
 745                                 cnt = 256;
 746                                 break;
 747                         }
 748                         if (receive(dev, cnt))
 749                                 goto epptimeout;
 750                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 751                                 goto epptimeout;
 752                 }
 753                 cnt = 0;
 754                 if (bc->bitrate < 50000)
 755                         cnt = 256;
 756                 else if (bc->bitrate < 100000)
 757                         cnt = 128;
 758                 while (cnt > 0 && stat & EPP_NREF) {
 759                         if (receive(dev, 1))
 760                                 goto epptimeout;
 761                         cnt--;
 762                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 763                                 goto epptimeout;
 764                 }
 765         }
 766         GETTICK(time3);
 767 #ifdef BAYCOM_DEBUG
 768         bc->debug_vals.mod_cycles = time2 - time1;
 769         bc->debug_vals.demod_cycles = time3 - time2;
 770 #endif /* BAYCOM_DEBUG */
 771         schedule_delayed_work(&bc->run_work, 1);
 772         if (!bc->skb)
 773                 netif_wake_queue(dev);
 774         return;
 775  epptimeout:
 776         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 777 }
 778
 779 /* ---------------------------------------------------------------------- */
 780 /*
 781  * ===================== network driver interface =========================
 782  */
 783
 784 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 785 {
 786         struct baycom_state *bc = netdev_priv(dev);
 787
 788         if (skb->data[0] != 0) {
 789                 do_kiss_params(bc, skb->data, skb->len);
 790                 dev_kfree_skb(skb);
 791                 return 0;
 792         }
 793         if (bc->skb)
 794                 return -1;
 795         /* strip KISS byte */
 796         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 797                 dev_kfree_skb(skb);
 798                 return 0;
 799         }
 800         netif_stop_queue(dev);
 801         bc->skb = skb;
 802         return 0;
 803 }
 804
 805 /* --------------------------------------------------------------------- */
 806
 807 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 808 {
 809         struct sockaddr *sa = (struct sockaddr *)addr;
 810
 811         /* addr is an AX.25 shifted ASCII mac address */
 812         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 813         return 0;
 814 }
 815
 816 /* --------------------------------------------------------------------- */
 817
 818 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
 819 {
 820         struct baycom_state *bc = netdev_priv(dev);
 821
 822         /*
 823          * Get the current statistics.  This may be called with the
 824          * card open or closed.
 825          */
 826         return &bc->stats;
 827 }
 828
 829 /* --------------------------------------------------------------------- */
 830
 831 static void epp_wakeup(void *handle)
 832 {
 833         struct net_device *dev = (struct net_device *)handle;
 834         struct baycom_state *bc = netdev_priv(dev);
 835
 836         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 837         if (!parport_claim(bc->pdev))
 838                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 839 }
 840
 841 /* --------------------------------------------------------------------- */
 842
 843 /*
 844  * Open/initialize the board. This is called (in the current kernel)
 845  * sometime after booting when the 'ifconfig' program is run.
 846  *
 847  * This routine should set everything up anew at each open, even
 848  * registers that "should" only need to be set once at boot, so that
 849  * there is non-reboot way to recover if something goes wrong.
 850  */
 851
 852 static int epp_open(struct net_device *dev)
 853 {
 854         struct baycom_state *bc = netdev_priv(dev);
 855         struct parport *pp = parport_find_base(dev->base_addr);
 856         unsigned int i, j;
 857         unsigned char tmp[128];
 858         unsigned char stat;
 859         unsigned long tstart;
 860
 861         if (!pp) {
 862                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 863                 return -ENXIO;
 864         }
 865 #if 0
 866         if (pp->irq < 0) {
 867                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 868                 parport_put_port(pp);
 869                 return -ENXIO;
 870         }
 871 #endif
 872         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 873                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 874                        bc_drvname, pp->base);
 875                 parport_put_port(pp);
 876                 return -EIO;
 877         }
 878         memset(&bc->modem, 0, sizeof(bc->modem));
 879         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
 880                                         epp_interrupt, PARPORT_DEV_EXCL, dev);
 881         parport_put_port(pp);
 882         if (!bc->pdev) {
 883                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 884                 return -ENXIO;
 885         }
 886         if (parport_claim(bc->pdev)) {
 887                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 888                 parport_unregister_device(bc->pdev);
 889                 return -EBUSY;
 890         }
 891         dev->irq = /*pp->irq*/ 0;
 892         INIT_WORK(&bc->run_work, (void *)(void *)epp_bh, dev);
 893         bc->work_running = 1;
 894         bc->modem = EPP_CONVENTIONAL;
 895         if (eppconfig(bc))
 896                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 897         else
 898                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 899         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 900         /* reset the modem */
 901         tmp[0] = 0;
 902         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 903         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 904                 goto epptimeout;
 905         /* autoprobe baud rate */
 906         tstart = jiffies;
 907         i = 0;
 908         while ((signed)(jiffies-tstart-HZ/3) < 0) {
 909                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 910                         goto epptimeout;
 911                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 912                         schedule();
 913                         continue;
 914                 }
 915                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 916                         goto epptimeout;
 917                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 918                         goto epptimeout;
 919                 i += 256;
 920         }
 921         for (j = 0; j < 256; j++) {
 922                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 923                         goto epptimeout;
 924                 if (!(stat & EPP_NREF))
 925                         break;
 926                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 927                         goto epptimeout;
 928                 i++;
 929         }
 930         tstart = jiffies - tstart;
 931         bc->bitrate = i * (8 * HZ) / tstart;
 932         j = 1;
 933         i = bc->bitrate >> 3;
 934         while (j < 7 && i > 150) {
 935                 j++;
 936                 i >>= 1;
 937         }
 938         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 939                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 940         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
 941         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 942                 goto epptimeout;
 943         /*
 944          * initialise hdlc variables
 945          */
 946         bc->hdlcrx.state = 0;
 947         bc->hdlcrx.numbits = 0;
 948         bc->hdlctx.state = tx_idle;
 949         bc->hdlctx.bufcnt = 0;
 950         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 951         bc->hdlctx.calibrate = 0;
 952         /* start the bottom half stuff */
 953         schedule_delayed_work(&bc->run_work, 1);
 954         netif_start_queue(dev);
 955         return 0;
 956
 957  epptimeout:
 958         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
 959         parport_write_control(pp, 0); /* reset the adapter */
 960         parport_release(bc->pdev);
 961         parport_unregister_device(bc->pdev);
 962         return -EIO;
 963 }
 964
 965 /* --------------------------------------------------------------------- */
 966
 967 static int epp_close(struct net_device *dev)
 968 {
 969         struct baycom_state *bc = netdev_priv(dev);
 970         struct parport *pp = bc->pdev->port;
 971         unsigned char tmp[1];
 972
 973         bc->work_running = 0;
 974         flush_scheduled_work();
 975         bc->stat = EPP_DCDBIT;
 976         tmp[0] = 0;
 977         pp->ops->epp_write_addr(pp, tmp, 1, 0);
 978         parport_write_control(pp, 0); /* reset the adapter */
 979         parport_release(bc->pdev);
 980         parport_unregister_device(bc->pdev);
 981         if (bc->skb)
 982                 dev_kfree_skb(bc->skb);
 983         bc->skb = NULL;
 984         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 985                bc_drvname, dev->base_addr, dev->irq);
 986         return 0;
 987 }
 988
 989 /* --------------------------------------------------------------------- */
 990
 991 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 992 {
 993         const char *cp;
 994
 995         if (strstr(modestr,"intclk"))
 996                 bc->cfg.intclk = 1;
 997         if (strstr(modestr,"extclk"))
 998                 bc->cfg.intclk = 0;
 999         if (strstr(modestr,"intmodem"))
1000                 bc->cfg.extmodem = 0;
1001         if (strstr(modestr,"extmodem"))
1002                 bc->cfg.extmodem = 1;
1003         if (strstr(modestr,"noloopback"))
1004                 bc->cfg.loopback = 0;
1005         if (strstr(modestr,"loopback"))
1006                 bc->cfg.loopback = 1;
1007         if ((cp = strstr(modestr,"fclk="))) {
1008                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1009                 if (bc->cfg.fclk < 1000000)
1010                         bc->cfg.fclk = 1000000;
1011                 if (bc->cfg.fclk > 25000000)
1012                         bc->cfg.fclk = 25000000;
1013         }
1014         if ((cp = strstr(modestr,"bps="))) {
1015                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1016                 if (bc->cfg.bps < 1000)
1017                         bc->cfg.bps = 1000;
1018                 if (bc->cfg.bps > 1500000)
1019                         bc->cfg.bps = 1500000;
1020         }
1021         return 0;
1022 }
1023
1024 /* --------------------------------------------------------------------- */
1025
1026 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1027 {
1028         struct baycom_state *bc = netdev_priv(dev);
1029         struct hdlcdrv_ioctl hi;
1030
1031         if (cmd != SIOCDEVPRIVATE)
1032                 return -ENOIOCTLCMD;
1033
1034         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1035                 return -EFAULT;
1036         switch (hi.cmd) {
1037         default:
1038                 return -ENOIOCTLCMD;
1039
1040         case HDLCDRVCTL_GETCHANNELPAR:
1041                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1042                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1043                 hi.data.cp.slottime = bc->ch_params.slottime;
1044                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1045                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1046                 break;
1047
1048         case HDLCDRVCTL_SETCHANNELPAR:
1049                 if (!capable(CAP_NET_ADMIN))
1050                         return -EACCES;
1051                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1052                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1053                 bc->ch_params.slottime = hi.data.cp.slottime;
1054                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1055                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1056                 bc->hdlctx.slotcnt = 1;
1057                 return 0;
1058
1059         case HDLCDRVCTL_GETMODEMPAR:
1060                 hi.data.mp.iobase = dev->base_addr;
1061                 hi.data.mp.irq = dev->irq;
1062                 hi.data.mp.dma = dev->dma;
1063                 hi.data.mp.dma2 = 0;
1064                 hi.data.mp.seriobase = 0;
1065                 hi.data.mp.pariobase = 0;
1066                 hi.data.mp.midiiobase = 0;
1067                 break;
1068
1069         case HDLCDRVCTL_SETMODEMPAR:
1070                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1071                         return -EACCES;
1072                 dev->base_addr = hi.data.mp.iobase;
1073                 dev->irq = /*hi.data.mp.irq*/0;
1074                 dev->dma = /*hi.data.mp.dma*/0;
1075                 return 0;
1076
1077         case HDLCDRVCTL_GETSTAT:
1078                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1079                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1080                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1081                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1082                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1083                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1084                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1085                 break;
1086
1087         case HDLCDRVCTL_OLDGETSTAT:
1088                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1089                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1090                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1091                 break;
1092
1093         case HDLCDRVCTL_CALIBRATE:
1094                 if (!capable(CAP_SYS_RAWIO))
1095                         return -EACCES;
1096                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1097                 return 0;
1098
1099         case HDLCDRVCTL_DRIVERNAME:
1100                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1101                 break;
1102
1103         case HDLCDRVCTL_GETMODE:
1104                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1105                         bc->cfg.intclk ? "int" : "ext",
1106                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1107                         bc->cfg.loopback ? ",loopback" : "");
1108                 break;
1109
1110         case HDLCDRVCTL_SETMODE:
1111                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1112                         return -EACCES;
1113                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1114                 return baycom_setmode(bc, hi.data.modename);
1115
1116         case HDLCDRVCTL_MODELIST:
1117                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1118                         sizeof(hi.data.modename));
1119                 break;
1120
1121         case HDLCDRVCTL_MODEMPARMASK:
1122                 return HDLCDRV_PARMASK_IOBASE;
1123
1124         }
1125         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1126                 return -EFAULT;
1127         return 0;
1128 }
1129
1130 /* --------------------------------------------------------------------- */
1131
1132 /*
1133  * Check for a network adaptor of this type, and return '0' if one exists.
1134  * If dev->base_addr == 0, probe all likely locations.
1135  * If dev->base_addr == 1, always return failure.
1136  * If dev->base_addr == 2, allocate space for the device and return success
1137  * (detachable devices only).
1138  */
1139 static void baycom_probe(struct net_device *dev)
1140 {
1141         static char ax25_bcast[AX25_ADDR_LEN] = {
1142                 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
1143         };
1144         static char ax25_nocall[AX25_ADDR_LEN] = {
1145                 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
1146         };
1147         const struct hdlcdrv_channel_params dflt_ch_params = {
1148                 20, 2, 10, 40, 0
1149         };
1150         struct baycom_state *bc;
1151
1152         /*
1153          * not a real probe! only initialize data structures
1154          */
1155         bc = netdev_priv(dev);
1156         /*
1157          * initialize the baycom_state struct
1158          */
1159         bc->ch_params = dflt_ch_params;
1160         bc->ptt_keyed = 0;
1161
1162         /*
1163          * initialize the device struct
1164          */
1165         dev->open = epp_open;
1166         dev->stop = epp_close;
1167         dev->do_ioctl = baycom_ioctl;
1168         dev->hard_start_xmit = baycom_send_packet;
1169         dev->get_stats = baycom_get_stats;
1170
1171         /* Fill in the fields of the device structure */
1172         bc->skb = NULL;
1173
1174         dev->hard_header = ax25_hard_header;
1175         dev->rebuild_header = ax25_rebuild_header;
1176         dev->set_mac_address = baycom_set_mac_address;
1177
1178         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1179         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1180         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1181         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1182         memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
1183         memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
1184         dev->tx_queue_len = 16;
1185
1186         /* New style flags */
1187         dev->flags = 0;
1188 }
1189
1190 /* --------------------------------------------------------------------- */
1191
1192 /*
1193  * command line settable parameters
1194  */
1195 static const char *mode[NR_PORTS] = { "", };
1196 static int iobase[NR_PORTS] = { 0x378, };
1197
1198 module_param_array(mode, charp, NULL, 0);
1199 MODULE_PARM_DESC(mode, "baycom operating mode");
1200 module_param_array(iobase, int, NULL, 0);
1201 MODULE_PARM_DESC(iobase, "baycom io base address");
1202
1203 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1204 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1205 MODULE_LICENSE("GPL");
1206
1207 /* --------------------------------------------------------------------- */
1208
1209 static void __init baycom_epp_dev_setup(struct net_device *dev)
1210 {
1211         struct baycom_state *bc = netdev_priv(dev);
1212
1213         /*
1214          * initialize part of the baycom_state struct
1215          */
1216         bc->magic = BAYCOM_MAGIC;
1217         bc->cfg.fclk = 19666600;
1218         bc->cfg.bps = 9600;
1219         /*
1220          * initialize part of the device struct
1221          */
1222         baycom_probe(dev);
1223 }
1224
1225 static int __init init_baycomepp(void)
1226 {
1227         int i, found = 0;
1228         char set_hw = 1;
1229
1230         printk(bc_drvinfo);
1231         /*
1232          * register net devices
1233          */
1234         for (i = 0; i < NR_PORTS; i++) {
1235                 struct net_device *dev;
1236
1237                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1238                                    baycom_epp_dev_setup);
1239
1240                 if (!dev) {
1241                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1242                         return found ? 0 : -ENOMEM;
1243                 }
1244
1245                 sprintf(dev->name, "bce%d", i);
1246                 dev->base_addr = iobase[i];
1247
1248                 if (!mode[i])
1249                         set_hw = 0;
1250                 if (!set_hw)
1251                         iobase[i] = 0;
1252
1253                 if (register_netdev(dev)) {
1254                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1255                         free_netdev(dev);
1256                         break;
1257                 }
1258                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1259                         set_hw = 0;
1260                 baycom_device[i] = dev;
1261                 found++;
1262         }
1263
1264         return found ? 0 : -ENXIO;
1265 }
1266
1267 static void __exit cleanup_baycomepp(void)
1268 {
1269         int i;
1270
1271         for(i = 0; i < NR_PORTS; i++) {
1272                 struct net_device *dev = baycom_device[i];
1273
1274                 if (dev) {
1275                         struct baycom_state *bc = netdev_priv(dev);
1276                         if (bc->magic == BAYCOM_MAGIC) {
1277                                 unregister_netdev(dev);
1278                                 free_netdev(dev);
1279                         } else
1280                                 printk(paranoia_str, "cleanup_module");
1281                 }
1282         }
1283 }
1284
1285 module_init(init_baycomepp);
1286 module_exit(cleanup_baycomepp);
1287
1288 /* --------------------------------------------------------------------- */
1289
1290 #ifndef MODULE
1291
1292 /*
1293  * format: baycom_epp=io,mode
1294  * mode: fpga config options
1295  */
1296
1297 static int __init baycom_epp_setup(char *str)
1298 {
1299         static unsigned __initdata nr_dev = 0;
1300         int ints[2];
1301
1302         if (nr_dev >= NR_PORTS)
1303                 return 0;
1304         str = get_options(str, 2, ints);
1305         if (ints[0] < 1)
1306                 return 0;
1307         mode[nr_dev] = str;
1308         iobase[nr_dev] = ints[1];
1309         nr_dev++;
1310         return 1;
1311 }
1312
1313 __setup("baycom_epp=", baycom_epp_setup);
1314
1315 #endif /* MODULE */
1316 /* --------------------------------------------------------------------- */