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   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/config.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/smp_lock.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/if_arp.h>
  54 #include <linux/kmod.h>
  55 #include <linux/hdlcdrv.h>
  56 #include <linux/baycom.h>
  57 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
  58 /* prototypes for ax25_encapsulate and ax25_rebuild_header */
  59 #include <net/ax25.h>
  60 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
  61 #include <linux/crc-ccitt.h>
  62
  63 /* --------------------------------------------------------------------- */
  64
  65 #define BAYCOM_DEBUG
  66 #define BAYCOM_MAGIC 19730510
  67
  68 /* --------------------------------------------------------------------- */
  69
  70 static const char paranoia_str[] = KERN_ERR
  71         "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
  72
  73 static const char bc_drvname[] = "baycom_epp";
  74 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  75 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
  76
  77 /* --------------------------------------------------------------------- */
  78
  79 #define NR_PORTS 4
  80
  81 static struct net_device *baycom_device[NR_PORTS];
  82
  83 /* --------------------------------------------------------------------- */
  84
  85 /* EPP status register */
  86 #define EPP_DCDBIT      0x80
  87 #define EPP_PTTBIT      0x08
  88 #define EPP_NREF        0x01
  89 #define EPP_NRAEF       0x02
  90 #define EPP_NRHF        0x04
  91 #define EPP_NTHF        0x20
  92 #define EPP_NTAEF       0x10
  93 #define EPP_NTEF        EPP_PTTBIT
  94
  95 /* EPP control register */
  96 #define EPP_TX_FIFO_ENABLE 0x10
  97 #define EPP_RX_FIFO_ENABLE 0x08
  98 #define EPP_MODEM_ENABLE   0x20
  99 #define EPP_LEDS           0xC0
 100 #define EPP_IRQ_ENABLE     0x10
 101
 102 /* LPT registers */
 103 #define LPTREG_ECONTROL       0x402
 104 #define LPTREG_CONFIGB        0x401
 105 #define LPTREG_CONFIGA        0x400
 106 #define LPTREG_EPPDATA        0x004
 107 #define LPTREG_EPPADDR        0x003
 108 #define LPTREG_CONTROL        0x002
 109 #define LPTREG_STATUS         0x001
 110 #define LPTREG_DATA           0x000
 111
 112 /* LPT control register */
 113 #define LPTCTRL_PROGRAM       0x04   /* 0 to reprogram */
 114 #define LPTCTRL_WRITE         0x01
 115 #define LPTCTRL_ADDRSTB       0x08
 116 #define LPTCTRL_DATASTB       0x02
 117 #define LPTCTRL_INTEN         0x10
 118
 119 /* LPT status register */
 120 #define LPTSTAT_SHIFT_NINTR   6
 121 #define LPTSTAT_WAIT          0x80
 122 #define LPTSTAT_NINTR         (1<<LPTSTAT_SHIFT_NINTR)
 123 #define LPTSTAT_PE            0x20
 124 #define LPTSTAT_DONE          0x10
 125 #define LPTSTAT_NERROR        0x08
 126 #define LPTSTAT_EPPTIMEOUT    0x01
 127
 128 /* LPT data register */
 129 #define LPTDATA_SHIFT_TDI     0
 130 #define LPTDATA_SHIFT_TMS     2
 131 #define LPTDATA_TDI           (1<<LPTDATA_SHIFT_TDI)
 132 #define LPTDATA_TCK           0x02
 133 #define LPTDATA_TMS           (1<<LPTDATA_SHIFT_TMS)
 134 #define LPTDATA_INITBIAS      0x80
 135
 136
 137 /* EPP modem config/status bits */
 138 #define EPP_DCDBIT            0x80
 139 #define EPP_PTTBIT            0x08
 140 #define EPP_RXEBIT            0x01
 141 #define EPP_RXAEBIT           0x02
 142 #define EPP_RXHFULL           0x04
 143
 144 #define EPP_NTHF              0x20
 145 #define EPP_NTAEF             0x10
 146 #define EPP_NTEF              EPP_PTTBIT
 147
 148 #define EPP_TX_FIFO_ENABLE    0x10
 149 #define EPP_RX_FIFO_ENABLE    0x08
 150 #define EPP_MODEM_ENABLE      0x20
 151 #define EPP_LEDS              0xC0
 152 #define EPP_IRQ_ENABLE        0x10
 153
 154 /* Xilinx 4k JTAG instructions */
 155 #define XC4K_IRLENGTH   3
 156 #define XC4K_EXTEST     0
 157 #define XC4K_PRELOAD    1
 158 #define XC4K_CONFIGURE  5
 159 #define XC4K_BYPASS     7
 160
 161 #define EPP_CONVENTIONAL  0
 162 #define EPP_FPGA          1
 163 #define EPP_FPGAEXTSTATUS 2
 164
 165 #define TXBUFFER_SIZE     ((HDLCDRV_MAXFLEN*6/5)+8)
 166
 167 /* ---------------------------------------------------------------------- */
 168 /*
 169  * Information that need to be kept for each board.
 170  */
 171
 172 struct baycom_state {
 173         int magic;
 174
 175         struct pardevice *pdev;
 176         unsigned int work_running;
 177         struct work_struct run_work;
 178         unsigned int modem;
 179         unsigned int bitrate;
 180         unsigned char stat;
 181
 182         struct {
 183                 unsigned int intclk;
 184                 unsigned int fclk;
 185                 unsigned int bps;
 186                 unsigned int extmodem;
 187                 unsigned int loopback;
 188         } cfg;
 189
 190         struct hdlcdrv_channel_params ch_params;
 191
 192         struct {
 193                 unsigned int bitbuf, bitstream, numbits, state;
 194                 unsigned char *bufptr;
 195                 int bufcnt;
 196                 unsigned char buf[TXBUFFER_SIZE];
 197         } hdlcrx;
 198
 199         struct {
 200                 int calibrate;
 201                 int slotcnt;
 202                 int flags;
 203                 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
 204                 unsigned char *bufptr;
 205                 int bufcnt;
 206                 unsigned char buf[TXBUFFER_SIZE];
 207         } hdlctx;
 208
 209         struct net_device_stats stats;
 210         unsigned int ptt_keyed;
 211         struct sk_buff *skb;  /* next transmit packet  */
 212
 213 #ifdef BAYCOM_DEBUG
 214         struct debug_vals {
 215                 unsigned long last_jiffies;
 216                 unsigned cur_intcnt;
 217                 unsigned last_intcnt;
 218                 int cur_pllcorr;
 219                 int last_pllcorr;
 220                 unsigned int mod_cycles;
 221                 unsigned int demod_cycles;
 222         } debug_vals;
 223 #endif /* BAYCOM_DEBUG */
 224 };
 225
 226 /* --------------------------------------------------------------------- */
 227
 228 #define KISS_VERBOSE
 229
 230 /* --------------------------------------------------------------------- */
 231
 232 #define PARAM_TXDELAY   1
 233 #define PARAM_PERSIST   2
 234 #define PARAM_SLOTTIME  3
 235 #define PARAM_TXTAIL    4
 236 #define PARAM_FULLDUP   5
 237 #define PARAM_HARDWARE  6
 238 #define PARAM_RETURN    255
 239
 240 /* --------------------------------------------------------------------- */
 241 /*
 242  * the CRC routines are stolen from WAMPES
 243  * by Dieter Deyke
 244  */
 245
 246
 247 /*---------------------------------------------------------------------------*/
 248
 249 #if 0
 250 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 251 {
 252         unsigned int crc = 0xffff;
 253
 254         for (;len>0;len--)
 255                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
 256         crc ^= 0xffff;
 257         *buffer++ = crc;
 258         *buffer++ = crc >> 8;
 259 }
 260 #endif
 261
 262 /*---------------------------------------------------------------------------*/
 263
 264 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 265 {
 266         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 267 }
 268
 269 /*---------------------------------------------------------------------------*/
 270
 271 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
 272 {
 273         return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
 274 }
 275
 276 /* ---------------------------------------------------------------------- */
 277
 278 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
 279
 280 /* --------------------------------------------------------------------- */
 281
 282 static inline void baycom_int_freq(struct baycom_state *bc)
 283 {
 284 #ifdef BAYCOM_DEBUG
 285         unsigned long cur_jiffies = jiffies;
 286         /*
 287          * measure the interrupt frequency
 288          */
 289         bc->debug_vals.cur_intcnt++;
 290         if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) {
 291                 bc->debug_vals.last_jiffies = cur_jiffies;
 292                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 293                 bc->debug_vals.cur_intcnt = 0;
 294                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 295                 bc->debug_vals.cur_pllcorr = 0;
 296         }
 297 #endif /* BAYCOM_DEBUG */
 298 }
 299
 300 /* ---------------------------------------------------------------------- */
 301 /*
 302  *    eppconfig_path should be setable  via /proc/sys.
 303  */
 304
 305 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
 306
 307 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 308
 309 /* eppconfig: called during ifconfig up to configure the modem */
 310 static int eppconfig(struct baycom_state *bc)
 311 {
 312         char modearg[256];
 313         char portarg[16];
 314         char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
 315                          NULL };
 316
 317         /* set up arguments */
 318         sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
 319                 bc->cfg.intclk ? "int" : "ext",
 320                 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
 321                 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
 322                 bc->cfg.loopback ? ",loopback" : "");
 323         sprintf(portarg, "%ld", bc->pdev->port->base);
 324         printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
 325
 326         return call_usermodehelper(eppconfig_path, argv, envp, 1);
 327 }
 328
 329 /* ---------------------------------------------------------------------- */
 330
 331 static void epp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 332 {
 333 }
 334
 335 /* ---------------------------------------------------------------------- */
 336
 337 static inline void do_kiss_params(struct baycom_state *bc,
 338                                   unsigned char *data, unsigned long len)
 339 {
 340
 341 #ifdef KISS_VERBOSE
 342 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 343 #else /* KISS_VERBOSE */
 344 #define PKP(a,b)
 345 #endif /* KISS_VERBOSE */
 346
 347         if (len < 2)
 348                 return;
 349         switch(data[0]) {
 350         case PARAM_TXDELAY:
 351                 bc->ch_params.tx_delay = data[1];
 352                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 353                 break;
 354         case PARAM_PERSIST:
 355                 bc->ch_params.ppersist = data[1];
 356                 PKP("p persistence = %u", bc->ch_params.ppersist);
 357                 break;
 358         case PARAM_SLOTTIME:
 359                 bc->ch_params.slottime = data[1];
 360                 PKP("slot time = %ums", bc->ch_params.slottime);
 361                 break;
 362         case PARAM_TXTAIL:
 363                 bc->ch_params.tx_tail = data[1];
 364                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 365                 break;
 366         case PARAM_FULLDUP:
 367                 bc->ch_params.fulldup = !!data[1];
 368                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 369                 break;
 370         default:
 371                 break;
 372         }
 373 #undef PKP
 374 }
 375
 376 /* --------------------------------------------------------------------- */
 377 /*
 378  * high performance HDLC encoder
 379  * yes, it's ugly, but generates pretty good code
 380  */
 381
 382 #define ENCODEITERA(j)                         \
 383 ({                                             \
 384         if (!(notbitstream & (0x1f0 << j)))    \
 385                 goto stuff##j;                 \
 386   encodeend##j:         ;                      \
 387 })
 388
 389 #define ENCODEITERB(j)                                          \
 390 ({                                                              \
 391   stuff##j:                                                     \
 392         bitstream &= ~(0x100 << j);                             \
 393         bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |        \
 394                 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);  \
 395         numbit++;                                               \
 396         notbitstream = ~bitstream;                              \
 397         goto encodeend##j;                                      \
 398 })
 399
 400
 401 static void encode_hdlc(struct baycom_state *bc)
 402 {
 403         struct sk_buff *skb;
 404         unsigned char *wp, *bp;
 405         int pkt_len;
 406         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 407         unsigned char crcarr[2];
 408
 409         if (bc->hdlctx.bufcnt > 0)
 410                 return;
 411         skb = bc->skb;
 412         if (!skb)
 413                 return;
 414         bc->skb = NULL;
 415         pkt_len = skb->len-1; /* strip KISS byte */
 416         wp = bc->hdlctx.buf;
 417         bp = skb->data+1;
 418         crc = calc_crc_ccitt(bp, pkt_len);
 419         crcarr[0] = crc;
 420         crcarr[1] = crc >> 8;
 421         *wp++ = 0x7e;
 422         bitstream = bitbuf = numbit = 0;
 423         while (pkt_len > -2) {
 424                 bitstream >>= 8;
 425                 bitstream |= ((unsigned int)*bp) << 8;
 426                 bitbuf |= ((unsigned int)*bp) << numbit;
 427                 notbitstream = ~bitstream;
 428                 bp++;
 429                 pkt_len--;
 430                 if (!pkt_len)
 431                         bp = crcarr;
 432                 ENCODEITERA(0);
 433                 ENCODEITERA(1);
 434                 ENCODEITERA(2);
 435                 ENCODEITERA(3);
 436                 ENCODEITERA(4);
 437                 ENCODEITERA(5);
 438                 ENCODEITERA(6);
 439                 ENCODEITERA(7);
 440                 goto enditer;
 441                 ENCODEITERB(0);
 442                 ENCODEITERB(1);
 443                 ENCODEITERB(2);
 444                 ENCODEITERB(3);
 445                 ENCODEITERB(4);
 446                 ENCODEITERB(5);
 447                 ENCODEITERB(6);
 448                 ENCODEITERB(7);
 449         enditer:
 450                 numbit += 8;
 451                 while (numbit >= 8) {
 452                         *wp++ = bitbuf;
 453                         bitbuf >>= 8;
 454                         numbit -= 8;
 455                 }
 456         }
 457         bitbuf |= 0x7e7e << numbit;
 458         numbit += 16;
 459         while (numbit >= 8) {
 460                 *wp++ = bitbuf;
 461                 bitbuf >>= 8;
 462                 numbit -= 8;
 463         }
 464         bc->hdlctx.bufptr = bc->hdlctx.buf;
 465         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 466         dev_kfree_skb(skb);
 467         bc->stats.tx_packets++;
 468 }
 469
 470 /* ---------------------------------------------------------------------- */
 471
 472 static unsigned short random_seed;
 473
 474 static inline unsigned short random_num(void)
 475 {
 476         random_seed = 28629 * random_seed + 157;
 477         return random_seed;
 478 }
 479
 480 /* ---------------------------------------------------------------------- */
 481
 482 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 483 {
 484         struct parport *pp = bc->pdev->port;
 485         unsigned char tmp[128];
 486         int i, j;
 487
 488         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 489                 bc->hdlctx.state = tx_idle;
 490         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 491                 if (bc->hdlctx.bufcnt <= 0)
 492                         encode_hdlc(bc);
 493                 if (bc->hdlctx.bufcnt <= 0)
 494                         return 0;
 495                 if (!bc->ch_params.fulldup) {
 496                         if (!(stat & EPP_DCDBIT)) {
 497                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 498                                 return 0;
 499                         }
 500                         if ((--bc->hdlctx.slotcnt) > 0)
 501                                 return 0;
 502                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 503                         if ((random_num() % 256) > bc->ch_params.ppersist)
 504                                 return 0;
 505                 }
 506         }
 507         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 508                 bc->hdlctx.state = tx_keyup;
 509                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 510                 bc->ptt_keyed++;
 511         }
 512         while (cnt > 0) {
 513                 switch (bc->hdlctx.state) {
 514                 case tx_keyup:
 515                         i = min_t(int, cnt, bc->hdlctx.flags);
 516                         cnt -= i;
 517                         bc->hdlctx.flags -= i;
 518                         if (bc->hdlctx.flags <= 0)
 519                                 bc->hdlctx.state = tx_data;
 520                         memset(tmp, 0x7e, sizeof(tmp));
 521                         while (i > 0) {
 522                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 523                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 524                                         return -1;
 525                                 i -= j;
 526                         }
 527                         break;
 528
 529                 case tx_data:
 530                         if (bc->hdlctx.bufcnt <= 0) {
 531                                 encode_hdlc(bc);
 532                                 if (bc->hdlctx.bufcnt <= 0) {
 533                                         bc->hdlctx.state = tx_tail;
 534                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 535                                         break;
 536                                 }
 537                         }
 538                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 539                         bc->hdlctx.bufcnt -= i;
 540                         cnt -= i;
 541                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 542                                         return -1;
 543                         bc->hdlctx.bufptr += i;
 544                         break;
 545
 546                 case tx_tail:
 547                         encode_hdlc(bc);
 548                         if (bc->hdlctx.bufcnt > 0) {
 549                                 bc->hdlctx.state = tx_data;
 550                                 break;
 551                         }
 552                         i = min_t(int, cnt, bc->hdlctx.flags);
 553                         if (i) {
 554                                 cnt -= i;
 555                                 bc->hdlctx.flags -= i;
 556                                 memset(tmp, 0x7e, sizeof(tmp));
 557                                 while (i > 0) {
 558                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 559                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 560                                                 return -1;
 561                                         i -= j;
 562                                 }
 563                                 break;
 564                         }
 565
 566                 default:  /* fall through */
 567                         if (bc->hdlctx.calibrate <= 0)
 568                                 return 0;
 569                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 570                         cnt -= i;
 571                         bc->hdlctx.calibrate -= i;
 572                         memset(tmp, 0, sizeof(tmp));
 573                         while (i > 0) {
 574                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 575                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 576                                         return -1;
 577                                 i -= j;
 578                         }
 579                         break;
 580                 }
 581         }
 582         return 0;
 583 }
 584
 585 /* ---------------------------------------------------------------------- */
 586
 587 static void do_rxpacket(struct net_device *dev)
 588 {
 589         struct baycom_state *bc = netdev_priv(dev);
 590         struct sk_buff *skb;
 591         unsigned char *cp;
 592         unsigned pktlen;
 593
 594         if (bc->hdlcrx.bufcnt < 4)
 595                 return;
 596         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 597                 return;
 598         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 599         if (!(skb = dev_alloc_skb(pktlen))) {
 600                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 601                 bc->stats.rx_dropped++;
 602                 return;
 603         }
 604         cp = skb_put(skb, pktlen);
 605         *cp++ = 0; /* KISS kludge */
 606         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 607         skb->protocol = ax25_type_trans(skb, dev);
 608         netif_rx(skb);
 609         dev->last_rx = jiffies;
 610         bc->stats.rx_packets++;
 611 }
 612
 613 #define DECODEITERA(j)                                                        \
 614 ({                                                                            \
 615         if (!(notbitstream & (0x0fc << j)))              /* flag or abort */  \
 616                 goto flgabrt##j;                                              \
 617         if ((bitstream & (0x1f8 << j)) == (0xf8 << j))   /* stuffed bit */    \
 618                 goto stuff##j;                                                \
 619   enditer##j:      ;                                                           \
 620 })
 621
 622 #define DECODEITERB(j)                                                                 \
 623 ({                                                                                     \
 624   flgabrt##j:                                                                          \
 625         if (!(notbitstream & (0x1fc << j))) {              /* abort received */        \
 626                 state = 0;                                                             \
 627                 goto enditer##j;                                                       \
 628         }                                                                              \
 629         if ((bitstream & (0x1fe << j)) != (0x0fc << j))   /* flag received */          \
 630                 goto enditer##j;                                                       \
 631         if (state)                                                                     \
 632                 do_rxpacket(dev);                                                      \
 633         bc->hdlcrx.bufcnt = 0;                                                         \
 634         bc->hdlcrx.bufptr = bc->hdlcrx.buf;                                            \
 635         state = 1;                                                                     \
 636         numbits = 7-j;                                                                 \
 637         goto enditer##j;                                                               \
 638   stuff##j:                                                                            \
 639         numbits--;                                                                     \
 640         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);        \
 641         goto enditer##j;                                                               \
 642 })
 643
 644 static int receive(struct net_device *dev, int cnt)
 645 {
 646         struct baycom_state *bc = netdev_priv(dev);
 647         struct parport *pp = bc->pdev->port;
 648         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 649         unsigned char tmp[128];
 650         unsigned char *cp;
 651         int cnt2, ret = 0;
 652
 653         numbits = bc->hdlcrx.numbits;
 654         state = bc->hdlcrx.state;
 655         bitstream = bc->hdlcrx.bitstream;
 656         bitbuf = bc->hdlcrx.bitbuf;
 657         while (cnt > 0) {
 658                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 659                 cnt -= cnt2;
 660                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 661                         ret = -1;
 662                         break;
 663                 }
 664                 cp = tmp;
 665                 for (; cnt2 > 0; cnt2--, cp++) {
 666                         bitstream >>= 8;
 667                         bitstream |= (*cp) << 8;
 668                         bitbuf >>= 8;
 669                         bitbuf |= (*cp) << 8;
 670                         numbits += 8;
 671                         notbitstream = ~bitstream;
 672                         DECODEITERA(0);
 673                         DECODEITERA(1);
 674                         DECODEITERA(2);
 675                         DECODEITERA(3);
 676                         DECODEITERA(4);
 677                         DECODEITERA(5);
 678                         DECODEITERA(6);
 679                         DECODEITERA(7);
 680                         goto enddec;
 681                         DECODEITERB(0);
 682                         DECODEITERB(1);
 683                         DECODEITERB(2);
 684                         DECODEITERB(3);
 685                         DECODEITERB(4);
 686                         DECODEITERB(5);
 687                         DECODEITERB(6);
 688                         DECODEITERB(7);
 689                 enddec:
 690                         while (state && numbits >= 8) {
 691                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 692                                         state = 0;
 693                                 } else {
 694                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 695                                         bc->hdlcrx.bufcnt++;
 696                                         numbits -= 8;
 697                                 }
 698                         }
 699                 }
 700         }
 701         bc->hdlcrx.numbits = numbits;
 702         bc->hdlcrx.state = state;
 703         bc->hdlcrx.bitstream = bitstream;
 704         bc->hdlcrx.bitbuf = bitbuf;
 705         return ret;
 706 }
 707
 708 /* --------------------------------------------------------------------- */
 709
 710 #ifdef __i386__
 711 #include <asm/msr.h>
 712 #define GETTICK(x)                                                \
 713 ({                                                                \
 714         if (cpu_has_tsc)                                          \
 715                 rdtscl(x);                                        \
 716 })
 717 #else /* __i386__ */
 718 #define GETTICK(x)
 719 #endif /* __i386__ */
 720
 721 static void epp_bh(struct net_device *dev)
 722 {
 723         struct baycom_state *bc;
 724         struct parport *pp;
 725         unsigned char stat;
 726         unsigned char tmp[2];
 727         unsigned int time1 = 0, time2 = 0, time3 = 0;
 728         int cnt, cnt2;
 729
 730         bc = netdev_priv(dev);
 731         if (!bc->work_running)
 732                 return;
 733         baycom_int_freq(bc);
 734         pp = bc->pdev->port;
 735         /* update status */
 736         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 737                 goto epptimeout;
 738         bc->stat = stat;
 739         bc->debug_vals.last_pllcorr = stat;
 740         GETTICK(time1);
 741         if (bc->modem == EPP_FPGAEXTSTATUS) {
 742                 /* get input count */
 743                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 744                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 745                         goto epptimeout;
 746                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 747                         goto epptimeout;
 748                 cnt = tmp[0] | (tmp[1] << 8);
 749                 cnt &= 0x7fff;
 750                 /* get output count */
 751                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 752                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 753                         goto epptimeout;
 754                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 755                         goto epptimeout;
 756                 cnt2 = tmp[0] | (tmp[1] << 8);
 757                 cnt2 = 16384 - (cnt2 & 0x7fff);
 758                 /* return to normal */
 759                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 760                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 761                         goto epptimeout;
 762                 if (transmit(bc, cnt2, stat))
 763                         goto epptimeout;
 764                 GETTICK(time2);
 765                 if (receive(dev, cnt))
 766                         goto epptimeout;
 767                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 768                         goto epptimeout;
 769                 bc->stat = stat;
 770         } else {
 771                 /* try to tx */
 772                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 773                 case EPP_NTHF:
 774                         cnt = 2048 - 256;
 775                         break;
 776
 777                 case EPP_NTAEF:
 778                         cnt = 2048 - 1793;
 779                         break;
 780
 781                 case 0:
 782                         cnt = 0;
 783                         break;
 784
 785                 default:
 786                         cnt = 2048 - 1025;
 787                         break;
 788                 }
 789                 if (transmit(bc, cnt, stat))
 790                         goto epptimeout;
 791                 GETTICK(time2);
 792                 /* do receiver */
 793                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 794                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 795                         case EPP_NRAEF:
 796                                 cnt = 1025;
 797                                 break;
 798
 799                         case 0:
 800                                 cnt = 1793;
 801                                 break;
 802
 803                         default:
 804                                 cnt = 256;
 805                                 break;
 806                         }
 807                         if (receive(dev, cnt))
 808                                 goto epptimeout;
 809                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 810                                 goto epptimeout;
 811                 }
 812                 cnt = 0;
 813                 if (bc->bitrate < 50000)
 814                         cnt = 256;
 815                 else if (bc->bitrate < 100000)
 816                         cnt = 128;
 817                 while (cnt > 0 && stat & EPP_NREF) {
 818                         if (receive(dev, 1))
 819                                 goto epptimeout;
 820                         cnt--;
 821                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 822                                 goto epptimeout;
 823                 }
 824         }
 825         GETTICK(time3);
 826 #ifdef BAYCOM_DEBUG
 827         bc->debug_vals.mod_cycles = time2 - time1;
 828         bc->debug_vals.demod_cycles = time3 - time2;
 829 #endif /* BAYCOM_DEBUG */
 830         schedule_delayed_work(&bc->run_work, 1);
 831         if (!bc->skb)
 832                 netif_wake_queue(dev);
 833         return;
 834  epptimeout:
 835         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 836 }
 837
 838 /* ---------------------------------------------------------------------- */
 839 /*
 840  * ===================== network driver interface =========================
 841  */
 842
 843 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 844 {
 845         struct baycom_state *bc = netdev_priv(dev);
 846
 847         if (skb->data[0] != 0) {
 848                 do_kiss_params(bc, skb->data, skb->len);
 849                 dev_kfree_skb(skb);
 850                 return 0;
 851         }
 852         if (bc->skb)
 853                 return -1;
 854         /* strip KISS byte */
 855         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 856                 dev_kfree_skb(skb);
 857                 return 0;
 858         }
 859         netif_stop_queue(dev);
 860         bc->skb = skb;
 861         return 0;
 862 }
 863
 864 /* --------------------------------------------------------------------- */
 865
 866 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 867 {
 868         struct sockaddr *sa = (struct sockaddr *)addr;
 869
 870         /* addr is an AX.25 shifted ASCII mac address */
 871         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 872         return 0;
 873 }
 874
 875 /* --------------------------------------------------------------------- */
 876
 877 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
 878 {
 879         struct baycom_state *bc = netdev_priv(dev);
 880
 881         /*
 882          * Get the current statistics.  This may be called with the
 883          * card open or closed.
 884          */
 885         return &bc->stats;
 886 }
 887
 888 /* --------------------------------------------------------------------- */
 889
 890 static void epp_wakeup(void *handle)
 891 {
 892         struct net_device *dev = (struct net_device *)handle;
 893         struct baycom_state *bc = netdev_priv(dev);
 894
 895         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 896         if (!parport_claim(bc->pdev))
 897                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 898 }
 899
 900 /* --------------------------------------------------------------------- */
 901
 902 /*
 903  * Open/initialize the board. This is called (in the current kernel)
 904  * sometime after booting when the 'ifconfig' program is run.
 905  *
 906  * This routine should set everything up anew at each open, even
 907  * registers that "should" only need to be set once at boot, so that
 908  * there is non-reboot way to recover if something goes wrong.
 909  */
 910
 911 static int epp_open(struct net_device *dev)
 912 {
 913         struct baycom_state *bc = netdev_priv(dev);
 914         struct parport *pp = parport_find_base(dev->base_addr);
 915         unsigned int i, j;
 916         unsigned char tmp[128];
 917         unsigned char stat;
 918         unsigned long tstart;
 919
 920         if (!pp) {
 921                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 922                 return -ENXIO;
 923         }
 924 #if 0
 925         if (pp->irq < 0) {
 926                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 927                 parport_put_port(pp);
 928                 return -ENXIO;
 929         }
 930 #endif
 931         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 932                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 933                        bc_drvname, pp->base);
 934                 parport_put_port(pp);
 935                 return -EIO;
 936         }
 937         memset(&bc->modem, 0, sizeof(bc->modem));
 938         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
 939                                         epp_interrupt, PARPORT_DEV_EXCL, dev);
 940         parport_put_port(pp);
 941         if (!bc->pdev) {
 942                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 943                 return -ENXIO;
 944         }
 945         if (parport_claim(bc->pdev)) {
 946                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 947                 parport_unregister_device(bc->pdev);
 948                 return -EBUSY;
 949         }
 950         dev->irq = /*pp->irq*/ 0;
 951         INIT_WORK(&bc->run_work, (void *)(void *)epp_bh, dev);
 952         bc->work_running = 1;
 953         bc->modem = EPP_CONVENTIONAL;
 954         if (eppconfig(bc))
 955                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 956         else
 957                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 958         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 959         /* reset the modem */
 960         tmp[0] = 0;
 961         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 962         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 963                 goto epptimeout;
 964         /* autoprobe baud rate */
 965         tstart = jiffies;
 966         i = 0;
 967         while ((signed)(jiffies-tstart-HZ/3) < 0) {
 968                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 969                         goto epptimeout;
 970                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 971                         schedule();
 972                         continue;
 973                 }
 974                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 975                         goto epptimeout;
 976                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 977                         goto epptimeout;
 978                 i += 256;
 979         }
 980         for (j = 0; j < 256; j++) {
 981                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 982                         goto epptimeout;
 983                 if (!(stat & EPP_NREF))
 984                         break;
 985                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 986                         goto epptimeout;
 987                 i++;
 988         }
 989         tstart = jiffies - tstart;
 990         bc->bitrate = i * (8 * HZ) / tstart;
 991         j = 1;
 992         i = bc->bitrate >> 3;
 993         while (j < 7 && i > 150) {
 994                 j++;
 995                 i >>= 1;
 996         }
 997         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 998                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 999         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
1000         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
1001                 goto epptimeout;
1002         /*
1003          * initialise hdlc variables
1004          */
1005         bc->hdlcrx.state = 0;
1006         bc->hdlcrx.numbits = 0;
1007         bc->hdlctx.state = tx_idle;
1008         bc->hdlctx.bufcnt = 0;
1009         bc->hdlctx.slotcnt = bc->ch_params.slottime;
1010         bc->hdlctx.calibrate = 0;
1011         /* start the bottom half stuff */
1012         schedule_delayed_work(&bc->run_work, 1);
1013         netif_start_queue(dev);
1014         return 0;
1015
1016  epptimeout:
1017         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
1018         parport_write_control(pp, 0); /* reset the adapter */
1019         parport_release(bc->pdev);
1020         parport_unregister_device(bc->pdev);
1021         return -EIO;
1022 }
1023
1024 /* --------------------------------------------------------------------- */
1025
1026 static int epp_close(struct net_device *dev)
1027 {
1028         struct baycom_state *bc = netdev_priv(dev);
1029         struct parport *pp = bc->pdev->port;
1030         unsigned char tmp[1];
1031
1032         bc->work_running = 0;
1033         flush_scheduled_work();
1034         bc->stat = EPP_DCDBIT;
1035         tmp[0] = 0;
1036         pp->ops->epp_write_addr(pp, tmp, 1, 0);
1037         parport_write_control(pp, 0); /* reset the adapter */
1038         parport_release(bc->pdev);
1039         parport_unregister_device(bc->pdev);
1040         if (bc->skb)
1041                 dev_kfree_skb(bc->skb);
1042         bc->skb = NULL;
1043         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
1044                bc_drvname, dev->base_addr, dev->irq);
1045         return 0;
1046 }
1047
1048 /* --------------------------------------------------------------------- */
1049
1050 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
1051 {
1052         const char *cp;
1053
1054         if (strstr(modestr,"intclk"))
1055                 bc->cfg.intclk = 1;
1056         if (strstr(modestr,"extclk"))
1057                 bc->cfg.intclk = 0;
1058         if (strstr(modestr,"intmodem"))
1059                 bc->cfg.extmodem = 0;
1060         if (strstr(modestr,"extmodem"))
1061                 bc->cfg.extmodem = 1;
1062         if (strstr(modestr,"noloopback"))
1063                 bc->cfg.loopback = 0;
1064         if (strstr(modestr,"loopback"))
1065                 bc->cfg.loopback = 1;
1066         if ((cp = strstr(modestr,"fclk="))) {
1067                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1068                 if (bc->cfg.fclk < 1000000)
1069                         bc->cfg.fclk = 1000000;
1070                 if (bc->cfg.fclk > 25000000)
1071                         bc->cfg.fclk = 25000000;
1072         }
1073         if ((cp = strstr(modestr,"bps="))) {
1074                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1075                 if (bc->cfg.bps < 1000)
1076                         bc->cfg.bps = 1000;
1077                 if (bc->cfg.bps > 1500000)
1078                         bc->cfg.bps = 1500000;
1079         }
1080         return 0;
1081 }
1082
1083 /* --------------------------------------------------------------------- */
1084
1085 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1086 {
1087         struct baycom_state *bc = netdev_priv(dev);
1088         struct hdlcdrv_ioctl hi;
1089
1090         if (cmd != SIOCDEVPRIVATE)
1091                 return -ENOIOCTLCMD;
1092
1093         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1094                 return -EFAULT;
1095         switch (hi.cmd) {
1096         default:
1097                 return -ENOIOCTLCMD;
1098
1099         case HDLCDRVCTL_GETCHANNELPAR:
1100                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1101                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1102                 hi.data.cp.slottime = bc->ch_params.slottime;
1103                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1104                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1105                 break;
1106
1107         case HDLCDRVCTL_SETCHANNELPAR:
1108                 if (!capable(CAP_NET_ADMIN))
1109                         return -EACCES;
1110                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1111                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1112                 bc->ch_params.slottime = hi.data.cp.slottime;
1113                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1114                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1115                 bc->hdlctx.slotcnt = 1;
1116                 return 0;
1117
1118         case HDLCDRVCTL_GETMODEMPAR:
1119                 hi.data.mp.iobase = dev->base_addr;
1120                 hi.data.mp.irq = dev->irq;
1121                 hi.data.mp.dma = dev->dma;
1122                 hi.data.mp.dma2 = 0;
1123                 hi.data.mp.seriobase = 0;
1124                 hi.data.mp.pariobase = 0;
1125                 hi.data.mp.midiiobase = 0;
1126                 break;
1127
1128         case HDLCDRVCTL_SETMODEMPAR:
1129                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1130                         return -EACCES;
1131                 dev->base_addr = hi.data.mp.iobase;
1132                 dev->irq = /*hi.data.mp.irq*/0;
1133                 dev->dma = /*hi.data.mp.dma*/0;
1134                 return 0;
1135
1136         case HDLCDRVCTL_GETSTAT:
1137                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1138                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1139                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1140                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1141                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1142                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1143                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1144                 break;
1145
1146         case HDLCDRVCTL_OLDGETSTAT:
1147                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1148                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1149                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1150                 break;
1151
1152         case HDLCDRVCTL_CALIBRATE:
1153                 if (!capable(CAP_SYS_RAWIO))
1154                         return -EACCES;
1155                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1156                 return 0;
1157
1158         case HDLCDRVCTL_DRIVERNAME:
1159                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1160                 break;
1161
1162         case HDLCDRVCTL_GETMODE:
1163                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1164                         bc->cfg.intclk ? "int" : "ext",
1165                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1166                         bc->cfg.loopback ? ",loopback" : "");
1167                 break;
1168
1169         case HDLCDRVCTL_SETMODE:
1170                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1171                         return -EACCES;
1172                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1173                 return baycom_setmode(bc, hi.data.modename);
1174
1175         case HDLCDRVCTL_MODELIST:
1176                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1177                         sizeof(hi.data.modename));
1178                 break;
1179
1180         case HDLCDRVCTL_MODEMPARMASK:
1181                 return HDLCDRV_PARMASK_IOBASE;
1182
1183         }
1184         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1185                 return -EFAULT;
1186         return 0;
1187 }
1188
1189 /* --------------------------------------------------------------------- */
1190
1191 /*
1192  * Check for a network adaptor of this type, and return '0' if one exists.
1193  * If dev->base_addr == 0, probe all likely locations.
1194  * If dev->base_addr == 1, always return failure.
1195  * If dev->base_addr == 2, allocate space for the device and return success
1196  * (detachable devices only).
1197  */
1198 static void baycom_probe(struct net_device *dev)
1199 {
1200         static char ax25_bcast[AX25_ADDR_LEN] = {
1201                 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1
1202         };
1203         static char ax25_nocall[AX25_ADDR_LEN] = {
1204                 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1
1205         };
1206         const struct hdlcdrv_channel_params dflt_ch_params = {
1207                 20, 2, 10, 40, 0
1208         };
1209         struct baycom_state *bc;
1210
1211         /*
1212          * not a real probe! only initialize data structures
1213          */
1214         bc = netdev_priv(dev);
1215         /*
1216          * initialize the baycom_state struct
1217          */
1218         bc->ch_params = dflt_ch_params;
1219         bc->ptt_keyed = 0;
1220
1221         /*
1222          * initialize the device struct
1223          */
1224         dev->open = epp_open;
1225         dev->stop = epp_close;
1226         dev->do_ioctl = baycom_ioctl;
1227         dev->hard_start_xmit = baycom_send_packet;
1228         dev->get_stats = baycom_get_stats;
1229
1230         /* Fill in the fields of the device structure */
1231         bc->skb = NULL;
1232
1233 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
1234         dev->hard_header = ax25_encapsulate;
1235         dev->rebuild_header = ax25_rebuild_header;
1236 #else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1237         dev->hard_header = NULL;
1238         dev->rebuild_header = NULL;
1239 #endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
1240         dev->set_mac_address = baycom_set_mac_address;
1241
1242         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1243         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1244         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1245         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1246         memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
1247         memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
1248         dev->tx_queue_len = 16;
1249
1250         /* New style flags */
1251         dev->flags = 0;
1252 }
1253
1254 /* --------------------------------------------------------------------- */
1255
1256 /*
1257  * command line settable parameters
1258  */
1259 static const char *mode[NR_PORTS] = { "", };
1260 static int iobase[NR_PORTS] = { 0x378, };
1261
1262 module_param_array(mode, charp, NULL, 0);
1263 MODULE_PARM_DESC(mode, "baycom operating mode");
1264 module_param_array(iobase, int, NULL, 0);
1265 MODULE_PARM_DESC(iobase, "baycom io base address");
1266
1267 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1268 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1269 MODULE_LICENSE("GPL");
1270
1271 /* --------------------------------------------------------------------- */
1272
1273 static void __init baycom_epp_dev_setup(struct net_device *dev)
1274 {
1275         struct baycom_state *bc = netdev_priv(dev);
1276
1277         /*
1278          * initialize part of the baycom_state struct
1279          */
1280         bc->magic = BAYCOM_MAGIC;
1281         bc->cfg.fclk = 19666600;
1282         bc->cfg.bps = 9600;
1283         /*
1284          * initialize part of the device struct
1285          */
1286         baycom_probe(dev);
1287 }
1288
1289 static int __init init_baycomepp(void)
1290 {
1291         int i, found = 0;
1292         char set_hw = 1;
1293
1294         printk(bc_drvinfo);
1295         /*
1296          * register net devices
1297          */
1298         for (i = 0; i < NR_PORTS; i++) {
1299                 struct net_device *dev;
1300
1301                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1302                                    baycom_epp_dev_setup);
1303
1304                 if (!dev) {
1305                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1306                         return found ? 0 : -ENOMEM;
1307                 }
1308
1309                 sprintf(dev->name, "bce%d", i);
1310                 dev->base_addr = iobase[i];
1311
1312                 if (!mode[i])
1313                         set_hw = 0;
1314                 if (!set_hw)
1315                         iobase[i] = 0;
1316
1317                 if (register_netdev(dev)) {
1318                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1319                         free_netdev(dev);
1320                         break;
1321                 }
1322                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1323                         set_hw = 0;
1324                 baycom_device[i] = dev;
1325                 found++;
1326         }
1327
1328         return found ? 0 : -ENXIO;
1329 }
1330
1331 static void __exit cleanup_baycomepp(void)
1332 {
1333         int i;
1334
1335         for(i = 0; i < NR_PORTS; i++) {
1336                 struct net_device *dev = baycom_device[i];
1337
1338                 if (dev) {
1339                         struct baycom_state *bc = netdev_priv(dev);
1340                         if (bc->magic == BAYCOM_MAGIC) {
1341                                 unregister_netdev(dev);
1342                                 free_netdev(dev);
1343                         } else
1344                                 printk(paranoia_str, "cleanup_module");
1345                 }
1346         }
1347 }
1348
1349 module_init(init_baycomepp);
1350 module_exit(cleanup_baycomepp);
1351
1352 /* --------------------------------------------------------------------- */
1353
1354 #ifndef MODULE
1355
1356 /*
1357  * format: baycom_epp=io,mode
1358  * mode: fpga config options
1359  */
1360
1361 static int __init baycom_epp_setup(char *str)
1362 {
1363         static unsigned __initdata nr_dev = 0;
1364         int ints[2];
1365
1366         if (nr_dev >= NR_PORTS)
1367                 return 0;
1368         str = get_options(str, 2, ints);
1369         if (ints[0] < 1)
1370                 return 0;
1371         mode[nr_dev] = str;
1372         iobase[nr_dev] = ints[1];
1373         nr_dev++;
1374         return 1;
1375 }
1376
1377 __setup("baycom_epp=", baycom_epp_setup);
1378
1379 #endif /* MODULE */
1380 /* --------------------------------------------------------------------- */