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 <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, UMH_WAIT_PROC);
 324 }
 325
 326 /* ---------------------------------------------------------------------- */
 327
 328 static inline void do_kiss_params(struct baycom_state *bc,
 329                                   unsigned char *data, unsigned long len)
 330 {
 331
 332 #ifdef KISS_VERBOSE
 333 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 334 #else /* KISS_VERBOSE */
 335 #define PKP(a,b)
 336 #endif /* KISS_VERBOSE */
 337
 338         if (len < 2)
 339                 return;
 340         switch(data[0]) {
 341         case PARAM_TXDELAY:
 342                 bc->ch_params.tx_delay = data[1];
 343                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 344                 break;
 345         case PARAM_PERSIST:
 346                 bc->ch_params.ppersist = data[1];
 347                 PKP("p persistence = %u", bc->ch_params.ppersist);
 348                 break;
 349         case PARAM_SLOTTIME:
 350                 bc->ch_params.slottime = data[1];
 351                 PKP("slot time = %ums", bc->ch_params.slottime);
 352                 break;
 353         case PARAM_TXTAIL:
 354                 bc->ch_params.tx_tail = data[1];
 355                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 356                 break;
 357         case PARAM_FULLDUP:
 358                 bc->ch_params.fulldup = !!data[1];
 359                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 360                 break;
 361         default:
 362                 break;
 363         }
 364 #undef PKP
 365 }
 366
 367 /* --------------------------------------------------------------------- */
 368
 369 static void encode_hdlc(struct baycom_state *bc)
 370 {
 371         struct sk_buff *skb;
 372         unsigned char *wp, *bp;
 373         int pkt_len;
 374         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 375         unsigned char crcarr[2];
 376         int j;
 377
 378         if (bc->hdlctx.bufcnt > 0)
 379                 return;
 380         skb = bc->skb;
 381         if (!skb)
 382                 return;
 383         bc->skb = NULL;
 384         pkt_len = skb->len-1; /* strip KISS byte */
 385         wp = bc->hdlctx.buf;
 386         bp = skb->data+1;
 387         crc = calc_crc_ccitt(bp, pkt_len);
 388         crcarr[0] = crc;
 389         crcarr[1] = crc >> 8;
 390         *wp++ = 0x7e;
 391         bitstream = bitbuf = numbit = 0;
 392         while (pkt_len > -2) {
 393                 bitstream >>= 8;
 394                 bitstream |= ((unsigned int)*bp) << 8;
 395                 bitbuf |= ((unsigned int)*bp) << numbit;
 396                 notbitstream = ~bitstream;
 397                 bp++;
 398                 pkt_len--;
 399                 if (!pkt_len)
 400                         bp = crcarr;
 401                 for (j = 0; j < 8; j++)
 402                         if (unlikely(!(notbitstream & (0x1f0 << j)))) {
 403                                 bitstream &= ~(0x100 << j);
 404                                 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
 405                                         ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
 406                                 numbit++;
 407                                 notbitstream = ~bitstream;
 408                         }
 409                 numbit += 8;
 410                 while (numbit >= 8) {
 411                         *wp++ = bitbuf;
 412                         bitbuf >>= 8;
 413                         numbit -= 8;
 414                 }
 415         }
 416         bitbuf |= 0x7e7e << numbit;
 417         numbit += 16;
 418         while (numbit >= 8) {
 419                 *wp++ = bitbuf;
 420                 bitbuf >>= 8;
 421                 numbit -= 8;
 422         }
 423         bc->hdlctx.bufptr = bc->hdlctx.buf;
 424         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 425         dev_kfree_skb(skb);
 426         bc->stats.tx_packets++;
 427 }
 428
 429 /* ---------------------------------------------------------------------- */
 430
 431 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 432 {
 433         struct parport *pp = bc->pdev->port;
 434         unsigned char tmp[128];
 435         int i, j;
 436
 437         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 438                 bc->hdlctx.state = tx_idle;
 439         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 440                 if (bc->hdlctx.bufcnt <= 0)
 441                         encode_hdlc(bc);
 442                 if (bc->hdlctx.bufcnt <= 0)
 443                         return 0;
 444                 if (!bc->ch_params.fulldup) {
 445                         if (!(stat & EPP_DCDBIT)) {
 446                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 447                                 return 0;
 448                         }
 449                         if ((--bc->hdlctx.slotcnt) > 0)
 450                                 return 0;
 451                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 452                         if ((random32() % 256) > bc->ch_params.ppersist)
 453                                 return 0;
 454                 }
 455         }
 456         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 457                 bc->hdlctx.state = tx_keyup;
 458                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 459                 bc->ptt_keyed++;
 460         }
 461         while (cnt > 0) {
 462                 switch (bc->hdlctx.state) {
 463                 case tx_keyup:
 464                         i = min_t(int, cnt, bc->hdlctx.flags);
 465                         cnt -= i;
 466                         bc->hdlctx.flags -= i;
 467                         if (bc->hdlctx.flags <= 0)
 468                                 bc->hdlctx.state = tx_data;
 469                         memset(tmp, 0x7e, sizeof(tmp));
 470                         while (i > 0) {
 471                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 472                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 473                                         return -1;
 474                                 i -= j;
 475                         }
 476                         break;
 477
 478                 case tx_data:
 479                         if (bc->hdlctx.bufcnt <= 0) {
 480                                 encode_hdlc(bc);
 481                                 if (bc->hdlctx.bufcnt <= 0) {
 482                                         bc->hdlctx.state = tx_tail;
 483                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 484                                         break;
 485                                 }
 486                         }
 487                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 488                         bc->hdlctx.bufcnt -= i;
 489                         cnt -= i;
 490                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 491                                         return -1;
 492                         bc->hdlctx.bufptr += i;
 493                         break;
 494
 495                 case tx_tail:
 496                         encode_hdlc(bc);
 497                         if (bc->hdlctx.bufcnt > 0) {
 498                                 bc->hdlctx.state = tx_data;
 499                                 break;
 500                         }
 501                         i = min_t(int, cnt, bc->hdlctx.flags);
 502                         if (i) {
 503                                 cnt -= i;
 504                                 bc->hdlctx.flags -= i;
 505                                 memset(tmp, 0x7e, sizeof(tmp));
 506                                 while (i > 0) {
 507                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 508                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 509                                                 return -1;
 510                                         i -= j;
 511                                 }
 512                                 break;
 513                         }
 514
 515                 default:  /* fall through */
 516                         if (bc->hdlctx.calibrate <= 0)
 517                                 return 0;
 518                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 519                         cnt -= i;
 520                         bc->hdlctx.calibrate -= i;
 521                         memset(tmp, 0, sizeof(tmp));
 522                         while (i > 0) {
 523                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 524                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 525                                         return -1;
 526                                 i -= j;
 527                         }
 528                         break;
 529                 }
 530         }
 531         return 0;
 532 }
 533
 534 /* ---------------------------------------------------------------------- */
 535
 536 static void do_rxpacket(struct net_device *dev)
 537 {
 538         struct baycom_state *bc = netdev_priv(dev);
 539         struct sk_buff *skb;
 540         unsigned char *cp;
 541         unsigned pktlen;
 542
 543         if (bc->hdlcrx.bufcnt < 4)
 544                 return;
 545         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 546                 return;
 547         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 548         if (!(skb = dev_alloc_skb(pktlen))) {
 549                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 550                 bc->stats.rx_dropped++;
 551                 return;
 552         }
 553         cp = skb_put(skb, pktlen);
 554         *cp++ = 0; /* KISS kludge */
 555         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 556         skb->protocol = ax25_type_trans(skb, dev);
 557         netif_rx(skb);
 558         dev->last_rx = jiffies;
 559         bc->stats.rx_packets++;
 560 }
 561
 562 static int receive(struct net_device *dev, int cnt)
 563 {
 564         struct baycom_state *bc = netdev_priv(dev);
 565         struct parport *pp = bc->pdev->port;
 566         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 567         unsigned char tmp[128];
 568         unsigned char *cp;
 569         int cnt2, ret = 0;
 570         int j;
 571
 572         numbits = bc->hdlcrx.numbits;
 573         state = bc->hdlcrx.state;
 574         bitstream = bc->hdlcrx.bitstream;
 575         bitbuf = bc->hdlcrx.bitbuf;
 576         while (cnt > 0) {
 577                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 578                 cnt -= cnt2;
 579                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 580                         ret = -1;
 581                         break;
 582                 }
 583                 cp = tmp;
 584                 for (; cnt2 > 0; cnt2--, cp++) {
 585                         bitstream >>= 8;
 586                         bitstream |= (*cp) << 8;
 587                         bitbuf >>= 8;
 588                         bitbuf |= (*cp) << 8;
 589                         numbits += 8;
 590                         notbitstream = ~bitstream;
 591                         for (j = 0; j < 8; j++) {
 592
 593                                 /* flag or abort */
 594                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
 595
 596                                         /* abort received */
 597                                         if (!(notbitstream & (0x1fc << j)))
 598                                                 state = 0;
 599
 600                                         /* not flag received */
 601                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
 602                                                 if (state)
 603                                                         do_rxpacket(dev);
 604                                                 bc->hdlcrx.bufcnt = 0;
 605                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
 606                                                 state = 1;
 607                                                 numbits = 7-j;
 608                                                 }
 609                                         }
 610
 611                                 /* stuffed bit */
 612                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
 613                                         numbits--;
 614                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
 615                                         }
 616                                 }
 617                         while (state && numbits >= 8) {
 618                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 619                                         state = 0;
 620                                 } else {
 621                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 622                                         bc->hdlcrx.bufcnt++;
 623                                         numbits -= 8;
 624                                 }
 625                         }
 626                 }
 627         }
 628         bc->hdlcrx.numbits = numbits;
 629         bc->hdlcrx.state = state;
 630         bc->hdlcrx.bitstream = bitstream;
 631         bc->hdlcrx.bitbuf = bitbuf;
 632         return ret;
 633 }
 634
 635 /* --------------------------------------------------------------------- */
 636
 637 #ifdef __i386__
 638 #include <asm/msr.h>
 639 #define GETTICK(x)                                                \
 640 ({                                                                \
 641         if (cpu_has_tsc)                                          \
 642                 rdtscl(x);                                        \
 643 })
 644 #else /* __i386__ */
 645 #define GETTICK(x)
 646 #endif /* __i386__ */
 647
 648 static void epp_bh(struct work_struct *work)
 649 {
 650         struct net_device *dev;
 651         struct baycom_state *bc;
 652         struct parport *pp;
 653         unsigned char stat;
 654         unsigned char tmp[2];
 655         unsigned int time1 = 0, time2 = 0, time3 = 0;
 656         int cnt, cnt2;
 657
 658         bc = container_of(work, struct baycom_state, run_work.work);
 659         dev = bc->dev;
 660         if (!bc->work_running)
 661                 return;
 662         baycom_int_freq(bc);
 663         pp = bc->pdev->port;
 664         /* update status */
 665         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 666                 goto epptimeout;
 667         bc->stat = stat;
 668         bc->debug_vals.last_pllcorr = stat;
 669         GETTICK(time1);
 670         if (bc->modem == EPP_FPGAEXTSTATUS) {
 671                 /* get input count */
 672                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 673                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 674                         goto epptimeout;
 675                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 676                         goto epptimeout;
 677                 cnt = tmp[0] | (tmp[1] << 8);
 678                 cnt &= 0x7fff;
 679                 /* get output count */
 680                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 681                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 682                         goto epptimeout;
 683                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 684                         goto epptimeout;
 685                 cnt2 = tmp[0] | (tmp[1] << 8);
 686                 cnt2 = 16384 - (cnt2 & 0x7fff);
 687                 /* return to normal */
 688                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 689                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 690                         goto epptimeout;
 691                 if (transmit(bc, cnt2, stat))
 692                         goto epptimeout;
 693                 GETTICK(time2);
 694                 if (receive(dev, cnt))
 695                         goto epptimeout;
 696                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 697                         goto epptimeout;
 698                 bc->stat = stat;
 699         } else {
 700                 /* try to tx */
 701                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 702                 case EPP_NTHF:
 703                         cnt = 2048 - 256;
 704                         break;
 705
 706                 case EPP_NTAEF:
 707                         cnt = 2048 - 1793;
 708                         break;
 709
 710                 case 0:
 711                         cnt = 0;
 712                         break;
 713
 714                 default:
 715                         cnt = 2048 - 1025;
 716                         break;
 717                 }
 718                 if (transmit(bc, cnt, stat))
 719                         goto epptimeout;
 720                 GETTICK(time2);
 721                 /* do receiver */
 722                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 723                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 724                         case EPP_NRAEF:
 725                                 cnt = 1025;
 726                                 break;
 727
 728                         case 0:
 729                                 cnt = 1793;
 730                                 break;
 731
 732                         default:
 733                                 cnt = 256;
 734                                 break;
 735                         }
 736                         if (receive(dev, cnt))
 737                                 goto epptimeout;
 738                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 739                                 goto epptimeout;
 740                 }
 741                 cnt = 0;
 742                 if (bc->bitrate < 50000)
 743                         cnt = 256;
 744                 else if (bc->bitrate < 100000)
 745                         cnt = 128;
 746                 while (cnt > 0 && stat & EPP_NREF) {
 747                         if (receive(dev, 1))
 748                                 goto epptimeout;
 749                         cnt--;
 750                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 751                                 goto epptimeout;
 752                 }
 753         }
 754         GETTICK(time3);
 755 #ifdef BAYCOM_DEBUG
 756         bc->debug_vals.mod_cycles = time2 - time1;
 757         bc->debug_vals.demod_cycles = time3 - time2;
 758 #endif /* BAYCOM_DEBUG */
 759         schedule_delayed_work(&bc->run_work, 1);
 760         if (!bc->skb)
 761                 netif_wake_queue(dev);
 762         return;
 763  epptimeout:
 764         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 765 }
 766
 767 /* ---------------------------------------------------------------------- */
 768 /*
 769  * ===================== network driver interface =========================
 770  */
 771
 772 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 773 {
 774         struct baycom_state *bc = netdev_priv(dev);
 775
 776         if (skb->data[0] != 0) {
 777                 do_kiss_params(bc, skb->data, skb->len);
 778                 dev_kfree_skb(skb);
 779                 return 0;
 780         }
 781         if (bc->skb)
 782                 return -1;
 783         /* strip KISS byte */
 784         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 785                 dev_kfree_skb(skb);
 786                 return 0;
 787         }
 788         netif_stop_queue(dev);
 789         bc->skb = skb;
 790         return 0;
 791 }
 792
 793 /* --------------------------------------------------------------------- */
 794
 795 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 796 {
 797         struct sockaddr *sa = (struct sockaddr *)addr;
 798
 799         /* addr is an AX.25 shifted ASCII mac address */
 800         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 801         return 0;
 802 }
 803
 804 /* --------------------------------------------------------------------- */
 805
 806 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
 807 {
 808         struct baycom_state *bc = netdev_priv(dev);
 809
 810         /*
 811          * Get the current statistics.  This may be called with the
 812          * card open or closed.
 813          */
 814         return &bc->stats;
 815 }
 816
 817 /* --------------------------------------------------------------------- */
 818
 819 static void epp_wakeup(void *handle)
 820 {
 821         struct net_device *dev = (struct net_device *)handle;
 822         struct baycom_state *bc = netdev_priv(dev);
 823
 824         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 825         if (!parport_claim(bc->pdev))
 826                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 827 }
 828
 829 /* --------------------------------------------------------------------- */
 830
 831 /*
 832  * Open/initialize the board. This is called (in the current kernel)
 833  * sometime after booting when the 'ifconfig' program is run.
 834  *
 835  * This routine should set everything up anew at each open, even
 836  * registers that "should" only need to be set once at boot, so that
 837  * there is non-reboot way to recover if something goes wrong.
 838  */
 839
 840 static int epp_open(struct net_device *dev)
 841 {
 842         struct baycom_state *bc = netdev_priv(dev);
 843         struct parport *pp = parport_find_base(dev->base_addr);
 844         unsigned int i, j;
 845         unsigned char tmp[128];
 846         unsigned char stat;
 847         unsigned long tstart;
 848
 849         if (!pp) {
 850                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 851                 return -ENXIO;
 852         }
 853 #if 0
 854         if (pp->irq < 0) {
 855                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 856                 parport_put_port(pp);
 857                 return -ENXIO;
 858         }
 859 #endif
 860         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 861                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 862                        bc_drvname, pp->base);
 863                 parport_put_port(pp);
 864                 return -EIO;
 865         }
 866         memset(&bc->modem, 0, sizeof(bc->modem));
 867         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
 868                                            NULL, PARPORT_DEV_EXCL, dev);
 869         parport_put_port(pp);
 870         if (!bc->pdev) {
 871                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 872                 return -ENXIO;
 873         }
 874         if (parport_claim(bc->pdev)) {
 875                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 876                 parport_unregister_device(bc->pdev);
 877                 return -EBUSY;
 878         }
 879         dev->irq = /*pp->irq*/ 0;
 880         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
 881         bc->work_running = 1;
 882         bc->modem = EPP_CONVENTIONAL;
 883         if (eppconfig(bc))
 884                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 885         else
 886                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 887         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 888         /* reset the modem */
 889         tmp[0] = 0;
 890         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 891         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 892                 goto epptimeout;
 893         /* autoprobe baud rate */
 894         tstart = jiffies;
 895         i = 0;
 896         while (time_before(jiffies, tstart + HZ/3)) {
 897                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 898                         goto epptimeout;
 899                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 900                         schedule();
 901                         continue;
 902                 }
 903                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 904                         goto epptimeout;
 905                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 906                         goto epptimeout;
 907                 i += 256;
 908         }
 909         for (j = 0; j < 256; j++) {
 910                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 911                         goto epptimeout;
 912                 if (!(stat & EPP_NREF))
 913                         break;
 914                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 915                         goto epptimeout;
 916                 i++;
 917         }
 918         tstart = jiffies - tstart;
 919         bc->bitrate = i * (8 * HZ) / tstart;
 920         j = 1;
 921         i = bc->bitrate >> 3;
 922         while (j < 7 && i > 150) {
 923                 j++;
 924                 i >>= 1;
 925         }
 926         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 927                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 928         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
 929         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 930                 goto epptimeout;
 931         /*
 932          * initialise hdlc variables
 933          */
 934         bc->hdlcrx.state = 0;
 935         bc->hdlcrx.numbits = 0;
 936         bc->hdlctx.state = tx_idle;
 937         bc->hdlctx.bufcnt = 0;
 938         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 939         bc->hdlctx.calibrate = 0;
 940         /* start the bottom half stuff */
 941         schedule_delayed_work(&bc->run_work, 1);
 942         netif_start_queue(dev);
 943         return 0;
 944
 945  epptimeout:
 946         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
 947         parport_write_control(pp, 0); /* reset the adapter */
 948         parport_release(bc->pdev);
 949         parport_unregister_device(bc->pdev);
 950         return -EIO;
 951 }
 952
 953 /* --------------------------------------------------------------------- */
 954
 955 static int epp_close(struct net_device *dev)
 956 {
 957         struct baycom_state *bc = netdev_priv(dev);
 958         struct parport *pp = bc->pdev->port;
 959         unsigned char tmp[1];
 960
 961         bc->work_running = 0;
 962         flush_scheduled_work();
 963         bc->stat = EPP_DCDBIT;
 964         tmp[0] = 0;
 965         pp->ops->epp_write_addr(pp, tmp, 1, 0);
 966         parport_write_control(pp, 0); /* reset the adapter */
 967         parport_release(bc->pdev);
 968         parport_unregister_device(bc->pdev);
 969         if (bc->skb)
 970                 dev_kfree_skb(bc->skb);
 971         bc->skb = NULL;
 972         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 973                bc_drvname, dev->base_addr, dev->irq);
 974         return 0;
 975 }
 976
 977 /* --------------------------------------------------------------------- */
 978
 979 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 980 {
 981         const char *cp;
 982
 983         if (strstr(modestr,"intclk"))
 984                 bc->cfg.intclk = 1;
 985         if (strstr(modestr,"extclk"))
 986                 bc->cfg.intclk = 0;
 987         if (strstr(modestr,"intmodem"))
 988                 bc->cfg.extmodem = 0;
 989         if (strstr(modestr,"extmodem"))
 990                 bc->cfg.extmodem = 1;
 991         if (strstr(modestr,"noloopback"))
 992                 bc->cfg.loopback = 0;
 993         if (strstr(modestr,"loopback"))
 994                 bc->cfg.loopback = 1;
 995         if ((cp = strstr(modestr,"fclk="))) {
 996                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
 997                 if (bc->cfg.fclk < 1000000)
 998                         bc->cfg.fclk = 1000000;
 999                 if (bc->cfg.fclk > 25000000)
1000                         bc->cfg.fclk = 25000000;
1001         }
1002         if ((cp = strstr(modestr,"bps="))) {
1003                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1004                 if (bc->cfg.bps < 1000)
1005                         bc->cfg.bps = 1000;
1006                 if (bc->cfg.bps > 1500000)
1007                         bc->cfg.bps = 1500000;
1008         }
1009         return 0;
1010 }
1011
1012 /* --------------------------------------------------------------------- */
1013
1014 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1015 {
1016         struct baycom_state *bc = netdev_priv(dev);
1017         struct hdlcdrv_ioctl hi;
1018
1019         if (cmd != SIOCDEVPRIVATE)
1020                 return -ENOIOCTLCMD;
1021
1022         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1023                 return -EFAULT;
1024         switch (hi.cmd) {
1025         default:
1026                 return -ENOIOCTLCMD;
1027
1028         case HDLCDRVCTL_GETCHANNELPAR:
1029                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1030                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1031                 hi.data.cp.slottime = bc->ch_params.slottime;
1032                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1033                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1034                 break;
1035
1036         case HDLCDRVCTL_SETCHANNELPAR:
1037                 if (!capable(CAP_NET_ADMIN))
1038                         return -EACCES;
1039                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1040                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1041                 bc->ch_params.slottime = hi.data.cp.slottime;
1042                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1043                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1044                 bc->hdlctx.slotcnt = 1;
1045                 return 0;
1046
1047         case HDLCDRVCTL_GETMODEMPAR:
1048                 hi.data.mp.iobase = dev->base_addr;
1049                 hi.data.mp.irq = dev->irq;
1050                 hi.data.mp.dma = dev->dma;
1051                 hi.data.mp.dma2 = 0;
1052                 hi.data.mp.seriobase = 0;
1053                 hi.data.mp.pariobase = 0;
1054                 hi.data.mp.midiiobase = 0;
1055                 break;
1056
1057         case HDLCDRVCTL_SETMODEMPAR:
1058                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1059                         return -EACCES;
1060                 dev->base_addr = hi.data.mp.iobase;
1061                 dev->irq = /*hi.data.mp.irq*/0;
1062                 dev->dma = /*hi.data.mp.dma*/0;
1063                 return 0;
1064
1065         case HDLCDRVCTL_GETSTAT:
1066                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1067                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1068                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1069                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1070                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1071                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1072                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1073                 break;
1074
1075         case HDLCDRVCTL_OLDGETSTAT:
1076                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1077                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1078                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1079                 break;
1080
1081         case HDLCDRVCTL_CALIBRATE:
1082                 if (!capable(CAP_SYS_RAWIO))
1083                         return -EACCES;
1084                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1085                 return 0;
1086
1087         case HDLCDRVCTL_DRIVERNAME:
1088                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1089                 break;
1090
1091         case HDLCDRVCTL_GETMODE:
1092                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1093                         bc->cfg.intclk ? "int" : "ext",
1094                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1095                         bc->cfg.loopback ? ",loopback" : "");
1096                 break;
1097
1098         case HDLCDRVCTL_SETMODE:
1099                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1100                         return -EACCES;
1101                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1102                 return baycom_setmode(bc, hi.data.modename);
1103
1104         case HDLCDRVCTL_MODELIST:
1105                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1106                         sizeof(hi.data.modename));
1107                 break;
1108
1109         case HDLCDRVCTL_MODEMPARMASK:
1110                 return HDLCDRV_PARMASK_IOBASE;
1111
1112         }
1113         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1114                 return -EFAULT;
1115         return 0;
1116 }
1117
1118 /* --------------------------------------------------------------------- */
1119
1120 /*
1121  * Check for a network adaptor of this type, and return '0' if one exists.
1122  * If dev->base_addr == 0, probe all likely locations.
1123  * If dev->base_addr == 1, always return failure.
1124  * If dev->base_addr == 2, allocate space for the device and return success
1125  * (detachable devices only).
1126  */
1127 static void baycom_probe(struct net_device *dev)
1128 {
1129         const struct hdlcdrv_channel_params dflt_ch_params = {
1130                 20, 2, 10, 40, 0
1131         };
1132         struct baycom_state *bc;
1133
1134         /*
1135          * not a real probe! only initialize data structures
1136          */
1137         bc = netdev_priv(dev);
1138         /*
1139          * initialize the baycom_state struct
1140          */
1141         bc->ch_params = dflt_ch_params;
1142         bc->ptt_keyed = 0;
1143
1144         /*
1145          * initialize the device struct
1146          */
1147         dev->open = epp_open;
1148         dev->stop = epp_close;
1149         dev->do_ioctl = baycom_ioctl;
1150         dev->hard_start_xmit = baycom_send_packet;
1151         dev->get_stats = baycom_get_stats;
1152
1153         /* Fill in the fields of the device structure */
1154         bc->skb = NULL;
1155
1156         dev->header_ops = &ax25_header_ops;
1157         dev->set_mac_address = baycom_set_mac_address;
1158
1159         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1160         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1161         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1162         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1163         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1164         memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1165         dev->tx_queue_len = 16;
1166
1167         /* New style flags */
1168         dev->flags = 0;
1169 }
1170
1171 /* --------------------------------------------------------------------- */
1172
1173 /*
1174  * command line settable parameters
1175  */
1176 static const char *mode[NR_PORTS] = { "", };
1177 static int iobase[NR_PORTS] = { 0x378, };
1178
1179 module_param_array(mode, charp, NULL, 0);
1180 MODULE_PARM_DESC(mode, "baycom operating mode");
1181 module_param_array(iobase, int, NULL, 0);
1182 MODULE_PARM_DESC(iobase, "baycom io base address");
1183
1184 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1185 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1186 MODULE_LICENSE("GPL");
1187
1188 /* --------------------------------------------------------------------- */
1189
1190 static void __init baycom_epp_dev_setup(struct net_device *dev)
1191 {
1192         struct baycom_state *bc = netdev_priv(dev);
1193
1194         /*
1195          * initialize part of the baycom_state struct
1196          */
1197         bc->dev = dev;
1198         bc->magic = BAYCOM_MAGIC;
1199         bc->cfg.fclk = 19666600;
1200         bc->cfg.bps = 9600;
1201         /*
1202          * initialize part of the device struct
1203          */
1204         baycom_probe(dev);
1205 }
1206
1207 static int __init init_baycomepp(void)
1208 {
1209         int i, found = 0;
1210         char set_hw = 1;
1211
1212         printk(bc_drvinfo);
1213         /*
1214          * register net devices
1215          */
1216         for (i = 0; i < NR_PORTS; i++) {
1217                 struct net_device *dev;
1218
1219                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1220                                    baycom_epp_dev_setup);
1221
1222                 if (!dev) {
1223                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1224                         return found ? 0 : -ENOMEM;
1225                 }
1226
1227                 sprintf(dev->name, "bce%d", i);
1228                 dev->base_addr = iobase[i];
1229
1230                 if (!mode[i])
1231                         set_hw = 0;
1232                 if (!set_hw)
1233                         iobase[i] = 0;
1234
1235                 if (register_netdev(dev)) {
1236                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1237                         free_netdev(dev);
1238                         break;
1239                 }
1240                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1241                         set_hw = 0;
1242                 baycom_device[i] = dev;
1243                 found++;
1244         }
1245
1246         return found ? 0 : -ENXIO;
1247 }
1248
1249 static void __exit cleanup_baycomepp(void)
1250 {
1251         int i;
1252
1253         for(i = 0; i < NR_PORTS; i++) {
1254                 struct net_device *dev = baycom_device[i];
1255
1256                 if (dev) {
1257                         struct baycom_state *bc = netdev_priv(dev);
1258                         if (bc->magic == BAYCOM_MAGIC) {
1259                                 unregister_netdev(dev);
1260                                 free_netdev(dev);
1261                         } else
1262                                 printk(paranoia_str, "cleanup_module");
1263                 }
1264         }
1265 }
1266
1267 module_init(init_baycomepp);
1268 module_exit(cleanup_baycomepp);
1269
1270 /* --------------------------------------------------------------------- */
1271
1272 #ifndef MODULE
1273
1274 /*
1275  * format: baycom_epp=io,mode
1276  * mode: fpga config options
1277  */
1278
1279 static int __init baycom_epp_setup(char *str)
1280 {
1281         static unsigned __initdata nr_dev = 0;
1282         int ints[2];
1283
1284         if (nr_dev >= NR_PORTS)
1285                 return 0;
1286         str = get_options(str, 2, ints);
1287         if (ints[0] < 1)
1288                 return 0;
1289         mode[nr_dev] = str;
1290         iobase[nr_dev] = ints[1];
1291         nr_dev++;
1292         return 1;
1293 }
1294
1295 __setup("baycom_epp=", baycom_epp_setup);
1296
1297 #endif /* MODULE */
1298 /* --------------------------------------------------------------------- */