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 <linux/random.h>
  56 #include <net/ax25.h>
  57 #include <asm/uaccess.h>
  58
  59 /* --------------------------------------------------------------------- */
  60
  61 #define BAYCOM_DEBUG
  62 #define BAYCOM_MAGIC 19730510
  63
  64 /* --------------------------------------------------------------------- */
  65
  66 static const char paranoia_str[] = KERN_ERR
  67         "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
  68
  69 static const char bc_drvname[] = "baycom_epp";
  70 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  71 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
  72
  73 /* --------------------------------------------------------------------- */
  74
  75 #define NR_PORTS 4
  76
  77 static struct net_device *baycom_device[NR_PORTS];
  78
  79 /* --------------------------------------------------------------------- */
  80
  81 /* EPP status register */
  82 #define EPP_DCDBIT      0x80
  83 #define EPP_PTTBIT      0x08
  84 #define EPP_NREF        0x01
  85 #define EPP_NRAEF       0x02
  86 #define EPP_NRHF        0x04
  87 #define EPP_NTHF        0x20
  88 #define EPP_NTAEF       0x10
  89 #define EPP_NTEF        EPP_PTTBIT
  90
  91 /* EPP control register */
  92 #define EPP_TX_FIFO_ENABLE 0x10
  93 #define EPP_RX_FIFO_ENABLE 0x08
  94 #define EPP_MODEM_ENABLE   0x20
  95 #define EPP_LEDS           0xC0
  96 #define EPP_IRQ_ENABLE     0x10
  97
  98 /* LPT registers */
  99 #define LPTREG_ECONTROL       0x402
 100 #define LPTREG_CONFIGB        0x401
 101 #define LPTREG_CONFIGA        0x400
 102 #define LPTREG_EPPDATA        0x004
 103 #define LPTREG_EPPADDR        0x003
 104 #define LPTREG_CONTROL        0x002
 105 #define LPTREG_STATUS         0x001
 106 #define LPTREG_DATA           0x000
 107
 108 /* LPT control register */
 109 #define LPTCTRL_PROGRAM       0x04   /* 0 to reprogram */
 110 #define LPTCTRL_WRITE         0x01
 111 #define LPTCTRL_ADDRSTB       0x08
 112 #define LPTCTRL_DATASTB       0x02
 113 #define LPTCTRL_INTEN         0x10
 114
 115 /* LPT status register */
 116 #define LPTSTAT_SHIFT_NINTR   6
 117 #define LPTSTAT_WAIT          0x80
 118 #define LPTSTAT_NINTR         (1<<LPTSTAT_SHIFT_NINTR)
 119 #define LPTSTAT_PE            0x20
 120 #define LPTSTAT_DONE          0x10
 121 #define LPTSTAT_NERROR        0x08
 122 #define LPTSTAT_EPPTIMEOUT    0x01
 123
 124 /* LPT data register */
 125 #define LPTDATA_SHIFT_TDI     0
 126 #define LPTDATA_SHIFT_TMS     2
 127 #define LPTDATA_TDI           (1<<LPTDATA_SHIFT_TDI)
 128 #define LPTDATA_TCK           0x02
 129 #define LPTDATA_TMS           (1<<LPTDATA_SHIFT_TMS)
 130 #define LPTDATA_INITBIAS      0x80
 131
 132
 133 /* EPP modem config/status bits */
 134 #define EPP_DCDBIT            0x80
 135 #define EPP_PTTBIT            0x08
 136 #define EPP_RXEBIT            0x01
 137 #define EPP_RXAEBIT           0x02
 138 #define EPP_RXHFULL           0x04
 139
 140 #define EPP_NTHF              0x20
 141 #define EPP_NTAEF             0x10
 142 #define EPP_NTEF              EPP_PTTBIT
 143
 144 #define EPP_TX_FIFO_ENABLE    0x10
 145 #define EPP_RX_FIFO_ENABLE    0x08
 146 #define EPP_MODEM_ENABLE      0x20
 147 #define EPP_LEDS              0xC0
 148 #define EPP_IRQ_ENABLE        0x10
 149
 150 /* Xilinx 4k JTAG instructions */
 151 #define XC4K_IRLENGTH   3
 152 #define XC4K_EXTEST     0
 153 #define XC4K_PRELOAD    1
 154 #define XC4K_CONFIGURE  5
 155 #define XC4K_BYPASS     7
 156
 157 #define EPP_CONVENTIONAL  0
 158 #define EPP_FPGA          1
 159 #define EPP_FPGAEXTSTATUS 2
 160
 161 #define TXBUFFER_SIZE     ((HDLCDRV_MAXFLEN*6/5)+8)
 162
 163 /* ---------------------------------------------------------------------- */
 164 /*
 165  * Information that need to be kept for each board.
 166  */
 167
 168 struct baycom_state {
 169         int magic;
 170
 171         struct pardevice *pdev;
 172         struct net_device *dev;
 173         unsigned int work_running;
 174         struct delayed_work run_work;
 175         unsigned int modem;
 176         unsigned int bitrate;
 177         unsigned char stat;
 178
 179         struct {
 180                 unsigned int intclk;
 181                 unsigned int fclk;
 182                 unsigned int bps;
 183                 unsigned int extmodem;
 184                 unsigned int loopback;
 185         } cfg;
 186
 187         struct hdlcdrv_channel_params ch_params;
 188
 189         struct {
 190                 unsigned int bitbuf, bitstream, numbits, state;
 191                 unsigned char *bufptr;
 192                 int bufcnt;
 193                 unsigned char buf[TXBUFFER_SIZE];
 194         } hdlcrx;
 195
 196         struct {
 197                 int calibrate;
 198                 int slotcnt;
 199                 int flags;
 200                 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
 201                 unsigned char *bufptr;
 202                 int bufcnt;
 203                 unsigned char buf[TXBUFFER_SIZE];
 204         } hdlctx;
 205
 206         struct net_device_stats stats;
 207         unsigned int ptt_keyed;
 208         struct sk_buff *skb;  /* next transmit packet  */
 209
 210 #ifdef BAYCOM_DEBUG
 211         struct debug_vals {
 212                 unsigned long last_jiffies;
 213                 unsigned cur_intcnt;
 214                 unsigned last_intcnt;
 215                 int cur_pllcorr;
 216                 int last_pllcorr;
 217                 unsigned int mod_cycles;
 218                 unsigned int demod_cycles;
 219         } debug_vals;
 220 #endif /* BAYCOM_DEBUG */
 221 };
 222
 223 /* --------------------------------------------------------------------- */
 224
 225 #define KISS_VERBOSE
 226
 227 /* --------------------------------------------------------------------- */
 228
 229 #define PARAM_TXDELAY   1
 230 #define PARAM_PERSIST   2
 231 #define PARAM_SLOTTIME  3
 232 #define PARAM_TXTAIL    4
 233 #define PARAM_FULLDUP   5
 234 #define PARAM_HARDWARE  6
 235 #define PARAM_RETURN    255
 236
 237 /* --------------------------------------------------------------------- */
 238 /*
 239  * the CRC routines are stolen from WAMPES
 240  * by Dieter Deyke
 241  */
 242
 243
 244 /*---------------------------------------------------------------------------*/
 245
 246 #if 0
 247 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 248 {
 249         unsigned int crc = 0xffff;
 250
 251         for (;len>0;len--)
 252                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
 253         crc ^= 0xffff;
 254         *buffer++ = crc;
 255         *buffer++ = crc >> 8;
 256 }
 257 #endif
 258
 259 /*---------------------------------------------------------------------------*/
 260
 261 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 262 {
 263         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 264 }
 265
 266 /*---------------------------------------------------------------------------*/
 267
 268 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
 269 {
 270         return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
 271 }
 272
 273 /* ---------------------------------------------------------------------- */
 274
 275 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
 276
 277 /* --------------------------------------------------------------------- */
 278
 279 static inline void baycom_int_freq(struct baycom_state *bc)
 280 {
 281 #ifdef BAYCOM_DEBUG
 282         unsigned long cur_jiffies = jiffies;
 283         /*
 284          * measure the interrupt frequency
 285          */
 286         bc->debug_vals.cur_intcnt++;
 287         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 288                 bc->debug_vals.last_jiffies = cur_jiffies;
 289                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 290                 bc->debug_vals.cur_intcnt = 0;
 291                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 292                 bc->debug_vals.cur_pllcorr = 0;
 293         }
 294 #endif /* BAYCOM_DEBUG */
 295 }
 296
 297 /* ---------------------------------------------------------------------- */
 298 /*
 299  *    eppconfig_path should be setable  via /proc/sys.
 300  */
 301
 302 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
 303
 304 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 305
 306 /* eppconfig: called during ifconfig up to configure the modem */
 307 static int eppconfig(struct baycom_state *bc)
 308 {
 309         char modearg[256];
 310         char portarg[16];
 311         char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
 312                          NULL };
 313
 314         /* set up arguments */
 315         sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
 316                 bc->cfg.intclk ? "int" : "ext",
 317                 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
 318                 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
 319                 bc->cfg.loopback ? ",loopback" : "");
 320         sprintf(portarg, "%ld", bc->pdev->port->base);
 321         printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
 322
 323         return call_usermodehelper(eppconfig_path, argv, envp, 1);
 324 }
 325
 326 /* ---------------------------------------------------------------------- */
 327
 328 static void epp_interrupt(int irq, void *dev_id)
 329 {
 330 }
 331
 332 /* ---------------------------------------------------------------------- */
 333
 334 static inline void do_kiss_params(struct baycom_state *bc,
 335                                   unsigned char *data, unsigned long len)
 336 {
 337
 338 #ifdef KISS_VERBOSE
 339 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 340 #else /* KISS_VERBOSE */
 341 #define PKP(a,b)
 342 #endif /* KISS_VERBOSE */
 343
 344         if (len < 2)
 345                 return;
 346         switch(data[0]) {
 347         case PARAM_TXDELAY:
 348                 bc->ch_params.tx_delay = data[1];
 349                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 350                 break;
 351         case PARAM_PERSIST:
 352                 bc->ch_params.ppersist = data[1];
 353                 PKP("p persistence = %u", bc->ch_params.ppersist);
 354                 break;
 355         case PARAM_SLOTTIME:
 356                 bc->ch_params.slottime = data[1];
 357                 PKP("slot time = %ums", bc->ch_params.slottime);
 358                 break;
 359         case PARAM_TXTAIL:
 360                 bc->ch_params.tx_tail = data[1];
 361                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 362                 break;
 363         case PARAM_FULLDUP:
 364                 bc->ch_params.fulldup = !!data[1];
 365                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 366                 break;
 367         default:
 368                 break;
 369         }
 370 #undef PKP
 371 }
 372
 373 /* --------------------------------------------------------------------- */
 374
 375 static void encode_hdlc(struct baycom_state *bc)
 376 {
 377         struct sk_buff *skb;
 378         unsigned char *wp, *bp;
 379         int pkt_len;
 380         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 381         unsigned char crcarr[2];
 382         int j;
 383
 384         if (bc->hdlctx.bufcnt > 0)
 385                 return;
 386         skb = bc->skb;
 387         if (!skb)
 388                 return;
 389         bc->skb = NULL;
 390         pkt_len = skb->len-1; /* strip KISS byte */
 391         wp = bc->hdlctx.buf;
 392         bp = skb->data+1;
 393         crc = calc_crc_ccitt(bp, pkt_len);
 394         crcarr[0] = crc;
 395         crcarr[1] = crc >> 8;
 396         *wp++ = 0x7e;
 397         bitstream = bitbuf = numbit = 0;
 398         while (pkt_len > -2) {
 399                 bitstream >>= 8;
 400                 bitstream |= ((unsigned int)*bp) << 8;
 401                 bitbuf |= ((unsigned int)*bp) << numbit;
 402                 notbitstream = ~bitstream;
 403                 bp++;
 404                 pkt_len--;
 405                 if (!pkt_len)
 406                         bp = crcarr;
 407                 for (j = 0; j < 8; j++)
 408                         if (unlikely(!(notbitstream & (0x1f0 << j)))) {
 409                                 bitstream &= ~(0x100 << j);
 410                                 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
 411                                         ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
 412                                 numbit++;
 413                                 notbitstream = ~bitstream;
 414                         }
 415                 numbit += 8;
 416                 while (numbit >= 8) {
 417                         *wp++ = bitbuf;
 418                         bitbuf >>= 8;
 419                         numbit -= 8;
 420                 }
 421         }
 422         bitbuf |= 0x7e7e << numbit;
 423         numbit += 16;
 424         while (numbit >= 8) {
 425                 *wp++ = bitbuf;
 426                 bitbuf >>= 8;
 427                 numbit -= 8;
 428         }
 429         bc->hdlctx.bufptr = bc->hdlctx.buf;
 430         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 431         dev_kfree_skb(skb);
 432         bc->stats.tx_packets++;
 433 }
 434
 435 /* ---------------------------------------------------------------------- */
 436
 437 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 438 {
 439         struct parport *pp = bc->pdev->port;
 440         unsigned char tmp[128];
 441         int i, j;
 442
 443         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 444                 bc->hdlctx.state = tx_idle;
 445         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 446                 if (bc->hdlctx.bufcnt <= 0)
 447                         encode_hdlc(bc);
 448                 if (bc->hdlctx.bufcnt <= 0)
 449                         return 0;
 450                 if (!bc->ch_params.fulldup) {
 451                         if (!(stat & EPP_DCDBIT)) {
 452                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 453                                 return 0;
 454                         }
 455                         if ((--bc->hdlctx.slotcnt) > 0)
 456                                 return 0;
 457                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 458                         if ((random32() % 256) > bc->ch_params.ppersist)
 459                                 return 0;
 460                 }
 461         }
 462         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 463                 bc->hdlctx.state = tx_keyup;
 464                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 465                 bc->ptt_keyed++;
 466         }
 467         while (cnt > 0) {
 468                 switch (bc->hdlctx.state) {
 469                 case tx_keyup:
 470                         i = min_t(int, cnt, bc->hdlctx.flags);
 471                         cnt -= i;
 472                         bc->hdlctx.flags -= i;
 473                         if (bc->hdlctx.flags <= 0)
 474                                 bc->hdlctx.state = tx_data;
 475                         memset(tmp, 0x7e, sizeof(tmp));
 476                         while (i > 0) {
 477                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 478                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 479                                         return -1;
 480                                 i -= j;
 481                         }
 482                         break;
 483
 484                 case tx_data:
 485                         if (bc->hdlctx.bufcnt <= 0) {
 486                                 encode_hdlc(bc);
 487                                 if (bc->hdlctx.bufcnt <= 0) {
 488                                         bc->hdlctx.state = tx_tail;
 489                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 490                                         break;
 491                                 }
 492                         }
 493                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 494                         bc->hdlctx.bufcnt -= i;
 495                         cnt -= i;
 496                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 497                                         return -1;
 498                         bc->hdlctx.bufptr += i;
 499                         break;
 500
 501                 case tx_tail:
 502                         encode_hdlc(bc);
 503                         if (bc->hdlctx.bufcnt > 0) {
 504                                 bc->hdlctx.state = tx_data;
 505                                 break;
 506                         }
 507                         i = min_t(int, cnt, bc->hdlctx.flags);
 508                         if (i) {
 509                                 cnt -= i;
 510                                 bc->hdlctx.flags -= i;
 511                                 memset(tmp, 0x7e, sizeof(tmp));
 512                                 while (i > 0) {
 513                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 514                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 515                                                 return -1;
 516                                         i -= j;
 517                                 }
 518                                 break;
 519                         }
 520
 521                 default:  /* fall through */
 522                         if (bc->hdlctx.calibrate <= 0)
 523                                 return 0;
 524                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 525                         cnt -= i;
 526                         bc->hdlctx.calibrate -= i;
 527                         memset(tmp, 0, sizeof(tmp));
 528                         while (i > 0) {
 529                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 530                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 531                                         return -1;
 532                                 i -= j;
 533                         }
 534                         break;
 535                 }
 536         }
 537         return 0;
 538 }
 539
 540 /* ---------------------------------------------------------------------- */
 541
 542 static void do_rxpacket(struct net_device *dev)
 543 {
 544         struct baycom_state *bc = netdev_priv(dev);
 545         struct sk_buff *skb;
 546         unsigned char *cp;
 547         unsigned pktlen;
 548
 549         if (bc->hdlcrx.bufcnt < 4)
 550                 return;
 551         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 552                 return;
 553         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 554         if (!(skb = dev_alloc_skb(pktlen))) {
 555                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 556                 bc->stats.rx_dropped++;
 557                 return;
 558         }
 559         cp = skb_put(skb, pktlen);
 560         *cp++ = 0; /* KISS kludge */
 561         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 562         skb->protocol = ax25_type_trans(skb, dev);
 563         netif_rx(skb);
 564         dev->last_rx = jiffies;
 565         bc->stats.rx_packets++;
 566 }
 567
 568 static int receive(struct net_device *dev, int cnt)
 569 {
 570         struct baycom_state *bc = netdev_priv(dev);
 571         struct parport *pp = bc->pdev->port;
 572         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 573         unsigned char tmp[128];
 574         unsigned char *cp;
 575         int cnt2, ret = 0;
 576         int j;
 577
 578         numbits = bc->hdlcrx.numbits;
 579         state = bc->hdlcrx.state;
 580         bitstream = bc->hdlcrx.bitstream;
 581         bitbuf = bc->hdlcrx.bitbuf;
 582         while (cnt > 0) {
 583                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 584                 cnt -= cnt2;
 585                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 586                         ret = -1;
 587                         break;
 588                 }
 589                 cp = tmp;
 590                 for (; cnt2 > 0; cnt2--, cp++) {
 591                         bitstream >>= 8;
 592                         bitstream |= (*cp) << 8;
 593                         bitbuf >>= 8;
 594                         bitbuf |= (*cp) << 8;
 595                         numbits += 8;
 596                         notbitstream = ~bitstream;
 597                         for (j = 0; j < 8; j++) {
 598
 599                                 /* flag or abort */
 600                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
 601
 602                                         /* abort received */
 603                                         if (!(notbitstream & (0x1fc << j)))
 604                                                 state = 0;
 605
 606                                         /* not flag received */
 607                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
 608                                                 if (state)
 609                                                         do_rxpacket(dev);
 610                                                 bc->hdlcrx.bufcnt = 0;
 611                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
 612                                                 state = 1;
 613                                                 numbits = 7-j;
 614                                                 }
 615                                         }
 616
 617                                 /* stuffed bit */
 618                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
 619                                         numbits--;
 620                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
 621                                         }
 622                                 }
 623                         while (state && numbits >= 8) {
 624                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 625                                         state = 0;
 626                                 } else {
 627                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 628                                         bc->hdlcrx.bufcnt++;
 629                                         numbits -= 8;
 630                                 }
 631                         }
 632                 }
 633         }
 634         bc->hdlcrx.numbits = numbits;
 635         bc->hdlcrx.state = state;
 636         bc->hdlcrx.bitstream = bitstream;
 637         bc->hdlcrx.bitbuf = bitbuf;
 638         return ret;
 639 }
 640
 641 /* --------------------------------------------------------------------- */
 642
 643 #ifdef __i386__
 644 #include <asm/msr.h>
 645 #define GETTICK(x)                                                \
 646 ({                                                                \
 647         if (cpu_has_tsc)                                          \
 648                 rdtscl(x);                                        \
 649 })
 650 #else /* __i386__ */
 651 #define GETTICK(x)
 652 #endif /* __i386__ */
 653
 654 static void epp_bh(struct work_struct *work)
 655 {
 656         struct net_device *dev;
 657         struct baycom_state *bc;
 658         struct parport *pp;
 659         unsigned char stat;
 660         unsigned char tmp[2];
 661         unsigned int time1 = 0, time2 = 0, time3 = 0;
 662         int cnt, cnt2;
 663
 664         bc = container_of(work, struct baycom_state, run_work.work);
 665         dev = bc->dev;
 666         if (!bc->work_running)
 667                 return;
 668         baycom_int_freq(bc);
 669         pp = bc->pdev->port;
 670         /* update status */
 671         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 672                 goto epptimeout;
 673         bc->stat = stat;
 674         bc->debug_vals.last_pllcorr = stat;
 675         GETTICK(time1);
 676         if (bc->modem == EPP_FPGAEXTSTATUS) {
 677                 /* get input count */
 678                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 679                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 680                         goto epptimeout;
 681                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 682                         goto epptimeout;
 683                 cnt = tmp[0] | (tmp[1] << 8);
 684                 cnt &= 0x7fff;
 685                 /* get output count */
 686                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 687                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 688                         goto epptimeout;
 689                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 690                         goto epptimeout;
 691                 cnt2 = tmp[0] | (tmp[1] << 8);
 692                 cnt2 = 16384 - (cnt2 & 0x7fff);
 693                 /* return to normal */
 694                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 695                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 696                         goto epptimeout;
 697                 if (transmit(bc, cnt2, stat))
 698                         goto epptimeout;
 699                 GETTICK(time2);
 700                 if (receive(dev, cnt))
 701                         goto epptimeout;
 702                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 703                         goto epptimeout;
 704                 bc->stat = stat;
 705         } else {
 706                 /* try to tx */
 707                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 708                 case EPP_NTHF:
 709                         cnt = 2048 - 256;
 710                         break;
 711
 712                 case EPP_NTAEF:
 713                         cnt = 2048 - 1793;
 714                         break;
 715
 716                 case 0:
 717                         cnt = 0;
 718                         break;
 719
 720                 default:
 721                         cnt = 2048 - 1025;
 722                         break;
 723                 }
 724                 if (transmit(bc, cnt, stat))
 725                         goto epptimeout;
 726                 GETTICK(time2);
 727                 /* do receiver */
 728                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 729                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 730                         case EPP_NRAEF:
 731                                 cnt = 1025;
 732                                 break;
 733
 734                         case 0:
 735                                 cnt = 1793;
 736                                 break;
 737
 738                         default:
 739                                 cnt = 256;
 740                                 break;
 741                         }
 742                         if (receive(dev, cnt))
 743                                 goto epptimeout;
 744                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 745                                 goto epptimeout;
 746                 }
 747                 cnt = 0;
 748                 if (bc->bitrate < 50000)
 749                         cnt = 256;
 750                 else if (bc->bitrate < 100000)
 751                         cnt = 128;
 752                 while (cnt > 0 && stat & EPP_NREF) {
 753                         if (receive(dev, 1))
 754                                 goto epptimeout;
 755                         cnt--;
 756                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 757                                 goto epptimeout;
 758                 }
 759         }
 760         GETTICK(time3);
 761 #ifdef BAYCOM_DEBUG
 762         bc->debug_vals.mod_cycles = time2 - time1;
 763         bc->debug_vals.demod_cycles = time3 - time2;
 764 #endif /* BAYCOM_DEBUG */
 765         schedule_delayed_work(&bc->run_work, 1);
 766         if (!bc->skb)
 767                 netif_wake_queue(dev);
 768         return;
 769  epptimeout:
 770         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 771 }
 772
 773 /* ---------------------------------------------------------------------- */
 774 /*
 775  * ===================== network driver interface =========================
 776  */
 777
 778 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 779 {
 780         struct baycom_state *bc = netdev_priv(dev);
 781
 782         if (skb->data[0] != 0) {
 783                 do_kiss_params(bc, skb->data, skb->len);
 784                 dev_kfree_skb(skb);
 785                 return 0;
 786         }
 787         if (bc->skb)
 788                 return -1;
 789         /* strip KISS byte */
 790         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 791                 dev_kfree_skb(skb);
 792                 return 0;
 793         }
 794         netif_stop_queue(dev);
 795         bc->skb = skb;
 796         return 0;
 797 }
 798
 799 /* --------------------------------------------------------------------- */
 800
 801 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 802 {
 803         struct sockaddr *sa = (struct sockaddr *)addr;
 804
 805         /* addr is an AX.25 shifted ASCII mac address */
 806         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 807         return 0;
 808 }
 809
 810 /* --------------------------------------------------------------------- */
 811
 812 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
 813 {
 814         struct baycom_state *bc = netdev_priv(dev);
 815
 816         /*
 817          * Get the current statistics.  This may be called with the
 818          * card open or closed.
 819          */
 820         return &bc->stats;
 821 }
 822
 823 /* --------------------------------------------------------------------- */
 824
 825 static void epp_wakeup(void *handle)
 826 {
 827         struct net_device *dev = (struct net_device *)handle;
 828         struct baycom_state *bc = netdev_priv(dev);
 829
 830         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 831         if (!parport_claim(bc->pdev))
 832                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 833 }
 834
 835 /* --------------------------------------------------------------------- */
 836
 837 /*
 838  * Open/initialize the board. This is called (in the current kernel)
 839  * sometime after booting when the 'ifconfig' program is run.
 840  *
 841  * This routine should set everything up anew at each open, even
 842  * registers that "should" only need to be set once at boot, so that
 843  * there is non-reboot way to recover if something goes wrong.
 844  */
 845
 846 static int epp_open(struct net_device *dev)
 847 {
 848         struct baycom_state *bc = netdev_priv(dev);
 849         struct parport *pp = parport_find_base(dev->base_addr);
 850         unsigned int i, j;
 851         unsigned char tmp[128];
 852         unsigned char stat;
 853         unsigned long tstart;
 854
 855         if (!pp) {
 856                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 857                 return -ENXIO;
 858         }
 859 #if 0
 860         if (pp->irq < 0) {
 861                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 862                 parport_put_port(pp);
 863                 return -ENXIO;
 864         }
 865 #endif
 866         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 867                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 868                        bc_drvname, pp->base);
 869                 parport_put_port(pp);
 870                 return -EIO;
 871         }
 872         memset(&bc->modem, 0, sizeof(bc->modem));
 873         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
 874                                         epp_interrupt, PARPORT_DEV_EXCL, dev);
 875         parport_put_port(pp);
 876         if (!bc->pdev) {
 877                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 878                 return -ENXIO;
 879         }
 880         if (parport_claim(bc->pdev)) {
 881                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 882                 parport_unregister_device(bc->pdev);
 883                 return -EBUSY;
 884         }
 885         dev->irq = /*pp->irq*/ 0;
 886         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
 887         bc->work_running = 1;
 888         bc->modem = EPP_CONVENTIONAL;
 889         if (eppconfig(bc))
 890                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 891         else
 892                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 893         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 894         /* reset the modem */
 895         tmp[0] = 0;
 896         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 897         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 898                 goto epptimeout;
 899         /* autoprobe baud rate */
 900         tstart = jiffies;
 901         i = 0;
 902         while (time_before(jiffies, tstart + HZ/3)) {
 903                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 904                         goto epptimeout;
 905                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 906                         schedule();
 907                         continue;
 908                 }
 909                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 910                         goto epptimeout;
 911                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 912                         goto epptimeout;
 913                 i += 256;
 914         }
 915         for (j = 0; j < 256; j++) {
 916                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 917                         goto epptimeout;
 918                 if (!(stat & EPP_NREF))
 919                         break;
 920                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 921                         goto epptimeout;
 922                 i++;
 923         }
 924         tstart = jiffies - tstart;
 925         bc->bitrate = i * (8 * HZ) / tstart;
 926         j = 1;
 927         i = bc->bitrate >> 3;
 928         while (j < 7 && i > 150) {
 929                 j++;
 930                 i >>= 1;
 931         }
 932         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 933                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 934         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
 935         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 936                 goto epptimeout;
 937         /*
 938          * initialise hdlc variables
 939          */
 940         bc->hdlcrx.state = 0;
 941         bc->hdlcrx.numbits = 0;
 942         bc->hdlctx.state = tx_idle;
 943         bc->hdlctx.bufcnt = 0;
 944         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 945         bc->hdlctx.calibrate = 0;
 946         /* start the bottom half stuff */
 947         schedule_delayed_work(&bc->run_work, 1);
 948         netif_start_queue(dev);
 949         return 0;
 950
 951  epptimeout:
 952         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
 953         parport_write_control(pp, 0); /* reset the adapter */
 954         parport_release(bc->pdev);
 955         parport_unregister_device(bc->pdev);
 956         return -EIO;
 957 }
 958
 959 /* --------------------------------------------------------------------- */
 960
 961 static int epp_close(struct net_device *dev)
 962 {
 963         struct baycom_state *bc = netdev_priv(dev);
 964         struct parport *pp = bc->pdev->port;
 965         unsigned char tmp[1];
 966
 967         bc->work_running = 0;
 968         flush_scheduled_work();
 969         bc->stat = EPP_DCDBIT;
 970         tmp[0] = 0;
 971         pp->ops->epp_write_addr(pp, tmp, 1, 0);
 972         parport_write_control(pp, 0); /* reset the adapter */
 973         parport_release(bc->pdev);
 974         parport_unregister_device(bc->pdev);
 975         if (bc->skb)
 976                 dev_kfree_skb(bc->skb);
 977         bc->skb = NULL;
 978         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 979                bc_drvname, dev->base_addr, dev->irq);
 980         return 0;
 981 }
 982
 983 /* --------------------------------------------------------------------- */
 984
 985 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 986 {
 987         const char *cp;
 988
 989         if (strstr(modestr,"intclk"))
 990                 bc->cfg.intclk = 1;
 991         if (strstr(modestr,"extclk"))
 992                 bc->cfg.intclk = 0;
 993         if (strstr(modestr,"intmodem"))
 994                 bc->cfg.extmodem = 0;
 995         if (strstr(modestr,"extmodem"))
 996                 bc->cfg.extmodem = 1;
 997         if (strstr(modestr,"noloopback"))
 998                 bc->cfg.loopback = 0;
 999         if (strstr(modestr,"loopback"))
1000                 bc->cfg.loopback = 1;
1001         if ((cp = strstr(modestr,"fclk="))) {
1002                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1003                 if (bc->cfg.fclk < 1000000)
1004                         bc->cfg.fclk = 1000000;
1005                 if (bc->cfg.fclk > 25000000)
1006                         bc->cfg.fclk = 25000000;
1007         }
1008         if ((cp = strstr(modestr,"bps="))) {
1009                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1010                 if (bc->cfg.bps < 1000)
1011                         bc->cfg.bps = 1000;
1012                 if (bc->cfg.bps > 1500000)
1013                         bc->cfg.bps = 1500000;
1014         }
1015         return 0;
1016 }
1017
1018 /* --------------------------------------------------------------------- */
1019
1020 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1021 {
1022         struct baycom_state *bc = netdev_priv(dev);
1023         struct hdlcdrv_ioctl hi;
1024
1025         if (cmd != SIOCDEVPRIVATE)
1026                 return -ENOIOCTLCMD;
1027
1028         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1029                 return -EFAULT;
1030         switch (hi.cmd) {
1031         default:
1032                 return -ENOIOCTLCMD;
1033
1034         case HDLCDRVCTL_GETCHANNELPAR:
1035                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1036                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1037                 hi.data.cp.slottime = bc->ch_params.slottime;
1038                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1039                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1040                 break;
1041
1042         case HDLCDRVCTL_SETCHANNELPAR:
1043                 if (!capable(CAP_NET_ADMIN))
1044                         return -EACCES;
1045                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1046                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1047                 bc->ch_params.slottime = hi.data.cp.slottime;
1048                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1049                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1050                 bc->hdlctx.slotcnt = 1;
1051                 return 0;
1052
1053         case HDLCDRVCTL_GETMODEMPAR:
1054                 hi.data.mp.iobase = dev->base_addr;
1055                 hi.data.mp.irq = dev->irq;
1056                 hi.data.mp.dma = dev->dma;
1057                 hi.data.mp.dma2 = 0;
1058                 hi.data.mp.seriobase = 0;
1059                 hi.data.mp.pariobase = 0;
1060                 hi.data.mp.midiiobase = 0;
1061                 break;
1062
1063         case HDLCDRVCTL_SETMODEMPAR:
1064                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1065                         return -EACCES;
1066                 dev->base_addr = hi.data.mp.iobase;
1067                 dev->irq = /*hi.data.mp.irq*/0;
1068                 dev->dma = /*hi.data.mp.dma*/0;
1069                 return 0;
1070
1071         case HDLCDRVCTL_GETSTAT:
1072                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1073                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1074                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1075                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1076                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1077                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1078                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1079                 break;
1080
1081         case HDLCDRVCTL_OLDGETSTAT:
1082                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1083                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1084                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1085                 break;
1086
1087         case HDLCDRVCTL_CALIBRATE:
1088                 if (!capable(CAP_SYS_RAWIO))
1089                         return -EACCES;
1090                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1091                 return 0;
1092
1093         case HDLCDRVCTL_DRIVERNAME:
1094                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1095                 break;
1096
1097         case HDLCDRVCTL_GETMODE:
1098                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1099                         bc->cfg.intclk ? "int" : "ext",
1100                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1101                         bc->cfg.loopback ? ",loopback" : "");
1102                 break;
1103
1104         case HDLCDRVCTL_SETMODE:
1105                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1106                         return -EACCES;
1107                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1108                 return baycom_setmode(bc, hi.data.modename);
1109
1110         case HDLCDRVCTL_MODELIST:
1111                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1112                         sizeof(hi.data.modename));
1113                 break;
1114
1115         case HDLCDRVCTL_MODEMPARMASK:
1116                 return HDLCDRV_PARMASK_IOBASE;
1117
1118         }
1119         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1120                 return -EFAULT;
1121         return 0;
1122 }
1123
1124 /* --------------------------------------------------------------------- */
1125
1126 /*
1127  * Check for a network adaptor of this type, and return '0' if one exists.
1128  * If dev->base_addr == 0, probe all likely locations.
1129  * If dev->base_addr == 1, always return failure.
1130  * If dev->base_addr == 2, allocate space for the device and return success
1131  * (detachable devices only).
1132  */
1133 static void baycom_probe(struct net_device *dev)
1134 {
1135         const struct hdlcdrv_channel_params dflt_ch_params = {
1136                 20, 2, 10, 40, 0
1137         };
1138         struct baycom_state *bc;
1139
1140         /*
1141          * not a real probe! only initialize data structures
1142          */
1143         bc = netdev_priv(dev);
1144         /*
1145          * initialize the baycom_state struct
1146          */
1147         bc->ch_params = dflt_ch_params;
1148         bc->ptt_keyed = 0;
1149
1150         /*
1151          * initialize the device struct
1152          */
1153         dev->open = epp_open;
1154         dev->stop = epp_close;
1155         dev->do_ioctl = baycom_ioctl;
1156         dev->hard_start_xmit = baycom_send_packet;
1157         dev->get_stats = baycom_get_stats;
1158
1159         /* Fill in the fields of the device structure */
1160         bc->skb = NULL;
1161
1162         dev->hard_header = ax25_hard_header;
1163         dev->rebuild_header = ax25_rebuild_header;
1164         dev->set_mac_address = baycom_set_mac_address;
1165
1166         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1167         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1168         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1169         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1170         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1171         memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1172         dev->tx_queue_len = 16;
1173
1174         /* New style flags */
1175         dev->flags = 0;
1176 }
1177
1178 /* --------------------------------------------------------------------- */
1179
1180 /*
1181  * command line settable parameters
1182  */
1183 static const char *mode[NR_PORTS] = { "", };
1184 static int iobase[NR_PORTS] = { 0x378, };
1185
1186 module_param_array(mode, charp, NULL, 0);
1187 MODULE_PARM_DESC(mode, "baycom operating mode");
1188 module_param_array(iobase, int, NULL, 0);
1189 MODULE_PARM_DESC(iobase, "baycom io base address");
1190
1191 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1192 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1193 MODULE_LICENSE("GPL");
1194
1195 /* --------------------------------------------------------------------- */
1196
1197 static void __init baycom_epp_dev_setup(struct net_device *dev)
1198 {
1199         struct baycom_state *bc = netdev_priv(dev);
1200
1201         /*
1202          * initialize part of the baycom_state struct
1203          */
1204         bc->dev = dev;
1205         bc->magic = BAYCOM_MAGIC;
1206         bc->cfg.fclk = 19666600;
1207         bc->cfg.bps = 9600;
1208         /*
1209          * initialize part of the device struct
1210          */
1211         baycom_probe(dev);
1212 }
1213
1214 static int __init init_baycomepp(void)
1215 {
1216         int i, found = 0;
1217         char set_hw = 1;
1218
1219         printk(bc_drvinfo);
1220         /*
1221          * register net devices
1222          */
1223         for (i = 0; i < NR_PORTS; i++) {
1224                 struct net_device *dev;
1225
1226                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1227                                    baycom_epp_dev_setup);
1228
1229                 if (!dev) {
1230                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1231                         return found ? 0 : -ENOMEM;
1232                 }
1233
1234                 sprintf(dev->name, "bce%d", i);
1235                 dev->base_addr = iobase[i];
1236
1237                 if (!mode[i])
1238                         set_hw = 0;
1239                 if (!set_hw)
1240                         iobase[i] = 0;
1241
1242                 if (register_netdev(dev)) {
1243                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1244                         free_netdev(dev);
1245                         break;
1246                 }
1247                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1248                         set_hw = 0;
1249                 baycom_device[i] = dev;
1250                 found++;
1251         }
1252
1253         return found ? 0 : -ENXIO;
1254 }
1255
1256 static void __exit cleanup_baycomepp(void)
1257 {
1258         int i;
1259
1260         for(i = 0; i < NR_PORTS; i++) {
1261                 struct net_device *dev = baycom_device[i];
1262
1263                 if (dev) {
1264                         struct baycom_state *bc = netdev_priv(dev);
1265                         if (bc->magic == BAYCOM_MAGIC) {
1266                                 unregister_netdev(dev);
1267                                 free_netdev(dev);
1268                         } else
1269                                 printk(paranoia_str, "cleanup_module");
1270                 }
1271         }
1272 }
1273
1274 module_init(init_baycomepp);
1275 module_exit(cleanup_baycomepp);
1276
1277 /* --------------------------------------------------------------------- */
1278
1279 #ifndef MODULE
1280
1281 /*
1282  * format: baycom_epp=io,mode
1283  * mode: fpga config options
1284  */
1285
1286 static int __init baycom_epp_setup(char *str)
1287 {
1288         static unsigned __initdata nr_dev = 0;
1289         int ints[2];
1290
1291         if (nr_dev >= NR_PORTS)
1292                 return 0;
1293         str = get_options(str, 2, ints);
1294         if (ints[0] < 1)
1295                 return 0;
1296         mode[nr_dev] = str;
1297         iobase[nr_dev] = ints[1];
1298         nr_dev++;
1299         return 1;
1300 }
1301
1302 __setup("baycom_epp=", baycom_epp_setup);
1303
1304 #endif /* MODULE */
1305 /* --------------------------------------------------------------------- */