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         unsigned int ptt_keyed;
 207         struct sk_buff *skb;  /* next transmit packet  */
 208
 209 #ifdef BAYCOM_DEBUG
 210         struct debug_vals {
 211                 unsigned long last_jiffies;
 212                 unsigned cur_intcnt;
 213                 unsigned last_intcnt;
 214                 int cur_pllcorr;
 215                 int last_pllcorr;
 216                 unsigned int mod_cycles;
 217                 unsigned int demod_cycles;
 218         } debug_vals;
 219 #endif /* BAYCOM_DEBUG */
 220 };
 221
 222 /* --------------------------------------------------------------------- */
 223
 224 #define KISS_VERBOSE
 225
 226 /* --------------------------------------------------------------------- */
 227
 228 #define PARAM_TXDELAY   1
 229 #define PARAM_PERSIST   2
 230 #define PARAM_SLOTTIME  3
 231 #define PARAM_TXTAIL    4
 232 #define PARAM_FULLDUP   5
 233 #define PARAM_HARDWARE  6
 234 #define PARAM_RETURN    255
 235
 236 /* --------------------------------------------------------------------- */
 237 /*
 238  * the CRC routines are stolen from WAMPES
 239  * by Dieter Deyke
 240  */
 241
 242
 243 /*---------------------------------------------------------------------------*/
 244
 245 #if 0
 246 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 247 {
 248         unsigned int crc = 0xffff;
 249
 250         for (;len>0;len--)
 251                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
 252         crc ^= 0xffff;
 253         *buffer++ = crc;
 254         *buffer++ = crc >> 8;
 255 }
 256 #endif
 257
 258 /*---------------------------------------------------------------------------*/
 259
 260 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 261 {
 262         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 263 }
 264
 265 /*---------------------------------------------------------------------------*/
 266
 267 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
 268 {
 269         return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
 270 }
 271
 272 /* ---------------------------------------------------------------------- */
 273
 274 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
 275
 276 /* --------------------------------------------------------------------- */
 277
 278 static inline void baycom_int_freq(struct baycom_state *bc)
 279 {
 280 #ifdef BAYCOM_DEBUG
 281         unsigned long cur_jiffies = jiffies;
 282         /*
 283          * measure the interrupt frequency
 284          */
 285         bc->debug_vals.cur_intcnt++;
 286         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 287                 bc->debug_vals.last_jiffies = cur_jiffies;
 288                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 289                 bc->debug_vals.cur_intcnt = 0;
 290                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 291                 bc->debug_vals.cur_pllcorr = 0;
 292         }
 293 #endif /* BAYCOM_DEBUG */
 294 }
 295
 296 /* ---------------------------------------------------------------------- */
 297 /*
 298  *    eppconfig_path should be setable  via /proc/sys.
 299  */
 300
 301 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
 302
 303 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 304
 305 /* eppconfig: called during ifconfig up to configure the modem */
 306 static int eppconfig(struct baycom_state *bc)
 307 {
 308         char modearg[256];
 309         char portarg[16];
 310         char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
 311                          NULL };
 312
 313         /* set up arguments */
 314         sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
 315                 bc->cfg.intclk ? "int" : "ext",
 316                 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
 317                 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
 318                 bc->cfg.loopback ? ",loopback" : "");
 319         sprintf(portarg, "%ld", bc->pdev->port->base);
 320         printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
 321
 322         return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC);
 323 }
 324
 325 /* ---------------------------------------------------------------------- */
 326
 327 static inline void do_kiss_params(struct baycom_state *bc,
 328                                   unsigned char *data, unsigned long len)
 329 {
 330
 331 #ifdef KISS_VERBOSE
 332 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 333 #else /* KISS_VERBOSE */
 334 #define PKP(a,b)
 335 #endif /* KISS_VERBOSE */
 336
 337         if (len < 2)
 338                 return;
 339         switch(data[0]) {
 340         case PARAM_TXDELAY:
 341                 bc->ch_params.tx_delay = data[1];
 342                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 343                 break;
 344         case PARAM_PERSIST:
 345                 bc->ch_params.ppersist = data[1];
 346                 PKP("p persistence = %u", bc->ch_params.ppersist);
 347                 break;
 348         case PARAM_SLOTTIME:
 349                 bc->ch_params.slottime = data[1];
 350                 PKP("slot time = %ums", bc->ch_params.slottime);
 351                 break;
 352         case PARAM_TXTAIL:
 353                 bc->ch_params.tx_tail = data[1];
 354                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 355                 break;
 356         case PARAM_FULLDUP:
 357                 bc->ch_params.fulldup = !!data[1];
 358                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 359                 break;
 360         default:
 361                 break;
 362         }
 363 #undef PKP
 364 }
 365
 366 /* --------------------------------------------------------------------- */
 367
 368 static void encode_hdlc(struct baycom_state *bc)
 369 {
 370         struct sk_buff *skb;
 371         unsigned char *wp, *bp;
 372         int pkt_len;
 373         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 374         unsigned char crcarr[2];
 375         int j;
 376
 377         if (bc->hdlctx.bufcnt > 0)
 378                 return;
 379         skb = bc->skb;
 380         if (!skb)
 381                 return;
 382         bc->skb = NULL;
 383         pkt_len = skb->len-1; /* strip KISS byte */
 384         wp = bc->hdlctx.buf;
 385         bp = skb->data+1;
 386         crc = calc_crc_ccitt(bp, pkt_len);
 387         crcarr[0] = crc;
 388         crcarr[1] = crc >> 8;
 389         *wp++ = 0x7e;
 390         bitstream = bitbuf = numbit = 0;
 391         while (pkt_len > -2) {
 392                 bitstream >>= 8;
 393                 bitstream |= ((unsigned int)*bp) << 8;
 394                 bitbuf |= ((unsigned int)*bp) << numbit;
 395                 notbitstream = ~bitstream;
 396                 bp++;
 397                 pkt_len--;
 398                 if (!pkt_len)
 399                         bp = crcarr;
 400                 for (j = 0; j < 8; j++)
 401                         if (unlikely(!(notbitstream & (0x1f0 << j)))) {
 402                                 bitstream &= ~(0x100 << j);
 403                                 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
 404                                         ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
 405                                 numbit++;
 406                                 notbitstream = ~bitstream;
 407                         }
 408                 numbit += 8;
 409                 while (numbit >= 8) {
 410                         *wp++ = bitbuf;
 411                         bitbuf >>= 8;
 412                         numbit -= 8;
 413                 }
 414         }
 415         bitbuf |= 0x7e7e << numbit;
 416         numbit += 16;
 417         while (numbit >= 8) {
 418                 *wp++ = bitbuf;
 419                 bitbuf >>= 8;
 420                 numbit -= 8;
 421         }
 422         bc->hdlctx.bufptr = bc->hdlctx.buf;
 423         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 424         dev_kfree_skb(skb);
 425         bc->dev->stats.tx_packets++;
 426 }
 427
 428 /* ---------------------------------------------------------------------- */
 429
 430 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 431 {
 432         struct parport *pp = bc->pdev->port;
 433         unsigned char tmp[128];
 434         int i, j;
 435
 436         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 437                 bc->hdlctx.state = tx_idle;
 438         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 439                 if (bc->hdlctx.bufcnt <= 0)
 440                         encode_hdlc(bc);
 441                 if (bc->hdlctx.bufcnt <= 0)
 442                         return 0;
 443                 if (!bc->ch_params.fulldup) {
 444                         if (!(stat & EPP_DCDBIT)) {
 445                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 446                                 return 0;
 447                         }
 448                         if ((--bc->hdlctx.slotcnt) > 0)
 449                                 return 0;
 450                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 451                         if ((random32() % 256) > bc->ch_params.ppersist)
 452                                 return 0;
 453                 }
 454         }
 455         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 456                 bc->hdlctx.state = tx_keyup;
 457                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 458                 bc->ptt_keyed++;
 459         }
 460         while (cnt > 0) {
 461                 switch (bc->hdlctx.state) {
 462                 case tx_keyup:
 463                         i = min_t(int, cnt, bc->hdlctx.flags);
 464                         cnt -= i;
 465                         bc->hdlctx.flags -= i;
 466                         if (bc->hdlctx.flags <= 0)
 467                                 bc->hdlctx.state = tx_data;
 468                         memset(tmp, 0x7e, sizeof(tmp));
 469                         while (i > 0) {
 470                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 471                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 472                                         return -1;
 473                                 i -= j;
 474                         }
 475                         break;
 476
 477                 case tx_data:
 478                         if (bc->hdlctx.bufcnt <= 0) {
 479                                 encode_hdlc(bc);
 480                                 if (bc->hdlctx.bufcnt <= 0) {
 481                                         bc->hdlctx.state = tx_tail;
 482                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 483                                         break;
 484                                 }
 485                         }
 486                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 487                         bc->hdlctx.bufcnt -= i;
 488                         cnt -= i;
 489                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 490                                         return -1;
 491                         bc->hdlctx.bufptr += i;
 492                         break;
 493
 494                 case tx_tail:
 495                         encode_hdlc(bc);
 496                         if (bc->hdlctx.bufcnt > 0) {
 497                                 bc->hdlctx.state = tx_data;
 498                                 break;
 499                         }
 500                         i = min_t(int, cnt, bc->hdlctx.flags);
 501                         if (i) {
 502                                 cnt -= i;
 503                                 bc->hdlctx.flags -= i;
 504                                 memset(tmp, 0x7e, sizeof(tmp));
 505                                 while (i > 0) {
 506                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 507                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 508                                                 return -1;
 509                                         i -= j;
 510                                 }
 511                                 break;
 512                         }
 513
 514                 default:  /* fall through */
 515                         if (bc->hdlctx.calibrate <= 0)
 516                                 return 0;
 517                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 518                         cnt -= i;
 519                         bc->hdlctx.calibrate -= i;
 520                         memset(tmp, 0, sizeof(tmp));
 521                         while (i > 0) {
 522                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 523                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 524                                         return -1;
 525                                 i -= j;
 526                         }
 527                         break;
 528                 }
 529         }
 530         return 0;
 531 }
 532
 533 /* ---------------------------------------------------------------------- */
 534
 535 static void do_rxpacket(struct net_device *dev)
 536 {
 537         struct baycom_state *bc = netdev_priv(dev);
 538         struct sk_buff *skb;
 539         unsigned char *cp;
 540         unsigned pktlen;
 541
 542         if (bc->hdlcrx.bufcnt < 4)
 543                 return;
 544         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 545                 return;
 546         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 547         if (!(skb = dev_alloc_skb(pktlen))) {
 548                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 549                 dev->stats.rx_dropped++;
 550                 return;
 551         }
 552         cp = skb_put(skb, pktlen);
 553         *cp++ = 0; /* KISS kludge */
 554         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 555         skb->protocol = ax25_type_trans(skb, dev);
 556         netif_rx(skb);
 557         dev->stats.rx_packets++;
 558 }
 559
 560 static int receive(struct net_device *dev, int cnt)
 561 {
 562         struct baycom_state *bc = netdev_priv(dev);
 563         struct parport *pp = bc->pdev->port;
 564         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 565         unsigned char tmp[128];
 566         unsigned char *cp;
 567         int cnt2, ret = 0;
 568         int j;
 569
 570         numbits = bc->hdlcrx.numbits;
 571         state = bc->hdlcrx.state;
 572         bitstream = bc->hdlcrx.bitstream;
 573         bitbuf = bc->hdlcrx.bitbuf;
 574         while (cnt > 0) {
 575                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 576                 cnt -= cnt2;
 577                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 578                         ret = -1;
 579                         break;
 580                 }
 581                 cp = tmp;
 582                 for (; cnt2 > 0; cnt2--, cp++) {
 583                         bitstream >>= 8;
 584                         bitstream |= (*cp) << 8;
 585                         bitbuf >>= 8;
 586                         bitbuf |= (*cp) << 8;
 587                         numbits += 8;
 588                         notbitstream = ~bitstream;
 589                         for (j = 0; j < 8; j++) {
 590
 591                                 /* flag or abort */
 592                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
 593
 594                                         /* abort received */
 595                                         if (!(notbitstream & (0x1fc << j)))
 596                                                 state = 0;
 597
 598                                         /* not flag received */
 599                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
 600                                                 if (state)
 601                                                         do_rxpacket(dev);
 602                                                 bc->hdlcrx.bufcnt = 0;
 603                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
 604                                                 state = 1;
 605                                                 numbits = 7-j;
 606                                                 }
 607                                         }
 608
 609                                 /* stuffed bit */
 610                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
 611                                         numbits--;
 612                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
 613                                         }
 614                                 }
 615                         while (state && numbits >= 8) {
 616                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 617                                         state = 0;
 618                                 } else {
 619                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 620                                         bc->hdlcrx.bufcnt++;
 621                                         numbits -= 8;
 622                                 }
 623                         }
 624                 }
 625         }
 626         bc->hdlcrx.numbits = numbits;
 627         bc->hdlcrx.state = state;
 628         bc->hdlcrx.bitstream = bitstream;
 629         bc->hdlcrx.bitbuf = bitbuf;
 630         return ret;
 631 }
 632
 633 /* --------------------------------------------------------------------- */
 634
 635 #ifdef __i386__
 636 #include <asm/msr.h>
 637 #define GETTICK(x)                                                \
 638 ({                                                                \
 639         if (cpu_has_tsc)                                          \
 640                 rdtscl(x);                                        \
 641 })
 642 #else /* __i386__ */
 643 #define GETTICK(x)
 644 #endif /* __i386__ */
 645
 646 static void epp_bh(struct work_struct *work)
 647 {
 648         struct net_device *dev;
 649         struct baycom_state *bc;
 650         struct parport *pp;
 651         unsigned char stat;
 652         unsigned char tmp[2];
 653         unsigned int time1 = 0, time2 = 0, time3 = 0;
 654         int cnt, cnt2;
 655
 656         bc = container_of(work, struct baycom_state, run_work.work);
 657         dev = bc->dev;
 658         if (!bc->work_running)
 659                 return;
 660         baycom_int_freq(bc);
 661         pp = bc->pdev->port;
 662         /* update status */
 663         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 664                 goto epptimeout;
 665         bc->stat = stat;
 666         bc->debug_vals.last_pllcorr = stat;
 667         GETTICK(time1);
 668         if (bc->modem == EPP_FPGAEXTSTATUS) {
 669                 /* get input count */
 670                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 671                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 672                         goto epptimeout;
 673                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 674                         goto epptimeout;
 675                 cnt = tmp[0] | (tmp[1] << 8);
 676                 cnt &= 0x7fff;
 677                 /* get output count */
 678                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 679                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 680                         goto epptimeout;
 681                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 682                         goto epptimeout;
 683                 cnt2 = tmp[0] | (tmp[1] << 8);
 684                 cnt2 = 16384 - (cnt2 & 0x7fff);
 685                 /* return to normal */
 686                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 687                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 688                         goto epptimeout;
 689                 if (transmit(bc, cnt2, stat))
 690                         goto epptimeout;
 691                 GETTICK(time2);
 692                 if (receive(dev, cnt))
 693                         goto epptimeout;
 694                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 695                         goto epptimeout;
 696                 bc->stat = stat;
 697         } else {
 698                 /* try to tx */
 699                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 700                 case EPP_NTHF:
 701                         cnt = 2048 - 256;
 702                         break;
 703
 704                 case EPP_NTAEF:
 705                         cnt = 2048 - 1793;
 706                         break;
 707
 708                 case 0:
 709                         cnt = 0;
 710                         break;
 711
 712                 default:
 713                         cnt = 2048 - 1025;
 714                         break;
 715                 }
 716                 if (transmit(bc, cnt, stat))
 717                         goto epptimeout;
 718                 GETTICK(time2);
 719                 /* do receiver */
 720                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 721                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 722                         case EPP_NRAEF:
 723                                 cnt = 1025;
 724                                 break;
 725
 726                         case 0:
 727                                 cnt = 1793;
 728                                 break;
 729
 730                         default:
 731                                 cnt = 256;
 732                                 break;
 733                         }
 734                         if (receive(dev, cnt))
 735                                 goto epptimeout;
 736                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 737                                 goto epptimeout;
 738                 }
 739                 cnt = 0;
 740                 if (bc->bitrate < 50000)
 741                         cnt = 256;
 742                 else if (bc->bitrate < 100000)
 743                         cnt = 128;
 744                 while (cnt > 0 && stat & EPP_NREF) {
 745                         if (receive(dev, 1))
 746                                 goto epptimeout;
 747                         cnt--;
 748                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 749                                 goto epptimeout;
 750                 }
 751         }
 752         GETTICK(time3);
 753 #ifdef BAYCOM_DEBUG
 754         bc->debug_vals.mod_cycles = time2 - time1;
 755         bc->debug_vals.demod_cycles = time3 - time2;
 756 #endif /* BAYCOM_DEBUG */
 757         schedule_delayed_work(&bc->run_work, 1);
 758         if (!bc->skb)
 759                 netif_wake_queue(dev);
 760         return;
 761  epptimeout:
 762         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 763 }
 764
 765 /* ---------------------------------------------------------------------- */
 766 /*
 767  * ===================== network driver interface =========================
 768  */
 769
 770 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 771 {
 772         struct baycom_state *bc = netdev_priv(dev);
 773
 774         if (skb->data[0] != 0) {
 775                 do_kiss_params(bc, skb->data, skb->len);
 776                 dev_kfree_skb(skb);
 777                 return 0;
 778         }
 779         if (bc->skb)
 780                 return -1;
 781         /* strip KISS byte */
 782         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 783                 dev_kfree_skb(skb);
 784                 return 0;
 785         }
 786         netif_stop_queue(dev);
 787         bc->skb = skb;
 788         return 0;
 789 }
 790
 791 /* --------------------------------------------------------------------- */
 792
 793 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 794 {
 795         struct sockaddr *sa = (struct sockaddr *)addr;
 796
 797         /* addr is an AX.25 shifted ASCII mac address */
 798         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 799         return 0;
 800 }
 801
 802 /* --------------------------------------------------------------------- */
 803
 804 static void epp_wakeup(void *handle)
 805 {
 806         struct net_device *dev = (struct net_device *)handle;
 807         struct baycom_state *bc = netdev_priv(dev);
 808
 809         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 810         if (!parport_claim(bc->pdev))
 811                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 812 }
 813
 814 /* --------------------------------------------------------------------- */
 815
 816 /*
 817  * Open/initialize the board. This is called (in the current kernel)
 818  * sometime after booting when the 'ifconfig' program is run.
 819  *
 820  * This routine should set everything up anew at each open, even
 821  * registers that "should" only need to be set once at boot, so that
 822  * there is non-reboot way to recover if something goes wrong.
 823  */
 824
 825 static int epp_open(struct net_device *dev)
 826 {
 827         struct baycom_state *bc = netdev_priv(dev);
 828         struct parport *pp = parport_find_base(dev->base_addr);
 829         unsigned int i, j;
 830         unsigned char tmp[128];
 831         unsigned char stat;
 832         unsigned long tstart;
 833
 834         if (!pp) {
 835                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 836                 return -ENXIO;
 837         }
 838 #if 0
 839         if (pp->irq < 0) {
 840                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 841                 parport_put_port(pp);
 842                 return -ENXIO;
 843         }
 844 #endif
 845         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 846                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 847                        bc_drvname, pp->base);
 848                 parport_put_port(pp);
 849                 return -EIO;
 850         }
 851         memset(&bc->modem, 0, sizeof(bc->modem));
 852         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
 853                                            NULL, PARPORT_DEV_EXCL, dev);
 854         parport_put_port(pp);
 855         if (!bc->pdev) {
 856                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 857                 return -ENXIO;
 858         }
 859         if (parport_claim(bc->pdev)) {
 860                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 861                 parport_unregister_device(bc->pdev);
 862                 return -EBUSY;
 863         }
 864         dev->irq = /*pp->irq*/ 0;
 865         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
 866         bc->work_running = 1;
 867         bc->modem = EPP_CONVENTIONAL;
 868         if (eppconfig(bc))
 869                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 870         else
 871                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 872         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 873         /* reset the modem */
 874         tmp[0] = 0;
 875         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 876         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 877                 goto epptimeout;
 878         /* autoprobe baud rate */
 879         tstart = jiffies;
 880         i = 0;
 881         while (time_before(jiffies, tstart + HZ/3)) {
 882                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 883                         goto epptimeout;
 884                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 885                         schedule();
 886                         continue;
 887                 }
 888                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 889                         goto epptimeout;
 890                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 891                         goto epptimeout;
 892                 i += 256;
 893         }
 894         for (j = 0; j < 256; j++) {
 895                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 896                         goto epptimeout;
 897                 if (!(stat & EPP_NREF))
 898                         break;
 899                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 900                         goto epptimeout;
 901                 i++;
 902         }
 903         tstart = jiffies - tstart;
 904         bc->bitrate = i * (8 * HZ) / tstart;
 905         j = 1;
 906         i = bc->bitrate >> 3;
 907         while (j < 7 && i > 150) {
 908                 j++;
 909                 i >>= 1;
 910         }
 911         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 912                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 913         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
 914         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 915                 goto epptimeout;
 916         /*
 917          * initialise hdlc variables
 918          */
 919         bc->hdlcrx.state = 0;
 920         bc->hdlcrx.numbits = 0;
 921         bc->hdlctx.state = tx_idle;
 922         bc->hdlctx.bufcnt = 0;
 923         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 924         bc->hdlctx.calibrate = 0;
 925         /* start the bottom half stuff */
 926         schedule_delayed_work(&bc->run_work, 1);
 927         netif_start_queue(dev);
 928         return 0;
 929
 930  epptimeout:
 931         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
 932         parport_write_control(pp, 0); /* reset the adapter */
 933         parport_release(bc->pdev);
 934         parport_unregister_device(bc->pdev);
 935         return -EIO;
 936 }
 937
 938 /* --------------------------------------------------------------------- */
 939
 940 static int epp_close(struct net_device *dev)
 941 {
 942         struct baycom_state *bc = netdev_priv(dev);
 943         struct parport *pp = bc->pdev->port;
 944         unsigned char tmp[1];
 945
 946         bc->work_running = 0;
 947         cancel_delayed_work_sync(&bc->run_work);
 948         bc->stat = EPP_DCDBIT;
 949         tmp[0] = 0;
 950         pp->ops->epp_write_addr(pp, tmp, 1, 0);
 951         parport_write_control(pp, 0); /* reset the adapter */
 952         parport_release(bc->pdev);
 953         parport_unregister_device(bc->pdev);
 954         if (bc->skb)
 955                 dev_kfree_skb(bc->skb);
 956         bc->skb = NULL;
 957         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 958                bc_drvname, dev->base_addr, dev->irq);
 959         return 0;
 960 }
 961
 962 /* --------------------------------------------------------------------- */
 963
 964 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 965 {
 966         const char *cp;
 967
 968         if (strstr(modestr,"intclk"))
 969                 bc->cfg.intclk = 1;
 970         if (strstr(modestr,"extclk"))
 971                 bc->cfg.intclk = 0;
 972         if (strstr(modestr,"intmodem"))
 973                 bc->cfg.extmodem = 0;
 974         if (strstr(modestr,"extmodem"))
 975                 bc->cfg.extmodem = 1;
 976         if (strstr(modestr,"noloopback"))
 977                 bc->cfg.loopback = 0;
 978         if (strstr(modestr,"loopback"))
 979                 bc->cfg.loopback = 1;
 980         if ((cp = strstr(modestr,"fclk="))) {
 981                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
 982                 if (bc->cfg.fclk < 1000000)
 983                         bc->cfg.fclk = 1000000;
 984                 if (bc->cfg.fclk > 25000000)
 985                         bc->cfg.fclk = 25000000;
 986         }
 987         if ((cp = strstr(modestr,"bps="))) {
 988                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
 989                 if (bc->cfg.bps < 1000)
 990                         bc->cfg.bps = 1000;
 991                 if (bc->cfg.bps > 1500000)
 992                         bc->cfg.bps = 1500000;
 993         }
 994         return 0;
 995 }
 996
 997 /* --------------------------------------------------------------------- */
 998
 999 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1000 {
1001         struct baycom_state *bc = netdev_priv(dev);
1002         struct hdlcdrv_ioctl hi;
1003
1004         if (cmd != SIOCDEVPRIVATE)
1005                 return -ENOIOCTLCMD;
1006
1007         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1008                 return -EFAULT;
1009         switch (hi.cmd) {
1010         default:
1011                 return -ENOIOCTLCMD;
1012
1013         case HDLCDRVCTL_GETCHANNELPAR:
1014                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1015                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1016                 hi.data.cp.slottime = bc->ch_params.slottime;
1017                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1018                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1019                 break;
1020
1021         case HDLCDRVCTL_SETCHANNELPAR:
1022                 if (!capable(CAP_NET_ADMIN))
1023                         return -EACCES;
1024                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1025                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1026                 bc->ch_params.slottime = hi.data.cp.slottime;
1027                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1028                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1029                 bc->hdlctx.slotcnt = 1;
1030                 return 0;
1031
1032         case HDLCDRVCTL_GETMODEMPAR:
1033                 hi.data.mp.iobase = dev->base_addr;
1034                 hi.data.mp.irq = dev->irq;
1035                 hi.data.mp.dma = dev->dma;
1036                 hi.data.mp.dma2 = 0;
1037                 hi.data.mp.seriobase = 0;
1038                 hi.data.mp.pariobase = 0;
1039                 hi.data.mp.midiiobase = 0;
1040                 break;
1041
1042         case HDLCDRVCTL_SETMODEMPAR:
1043                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1044                         return -EACCES;
1045                 dev->base_addr = hi.data.mp.iobase;
1046                 dev->irq = /*hi.data.mp.irq*/0;
1047                 dev->dma = /*hi.data.mp.dma*/0;
1048                 return 0;
1049
1050         case HDLCDRVCTL_GETSTAT:
1051                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1052                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1053                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1054                 hi.data.cs.tx_packets = dev->stats.tx_packets;
1055                 hi.data.cs.tx_errors = dev->stats.tx_errors;
1056                 hi.data.cs.rx_packets = dev->stats.rx_packets;
1057                 hi.data.cs.rx_errors = dev->stats.rx_errors;
1058                 break;
1059
1060         case HDLCDRVCTL_OLDGETSTAT:
1061                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1062                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1063                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1064                 break;
1065
1066         case HDLCDRVCTL_CALIBRATE:
1067                 if (!capable(CAP_SYS_RAWIO))
1068                         return -EACCES;
1069                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1070                 return 0;
1071
1072         case HDLCDRVCTL_DRIVERNAME:
1073                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1074                 break;
1075
1076         case HDLCDRVCTL_GETMODE:
1077                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1078                         bc->cfg.intclk ? "int" : "ext",
1079                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1080                         bc->cfg.loopback ? ",loopback" : "");
1081                 break;
1082
1083         case HDLCDRVCTL_SETMODE:
1084                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1085                         return -EACCES;
1086                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1087                 return baycom_setmode(bc, hi.data.modename);
1088
1089         case HDLCDRVCTL_MODELIST:
1090                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1091                         sizeof(hi.data.modename));
1092                 break;
1093
1094         case HDLCDRVCTL_MODEMPARMASK:
1095                 return HDLCDRV_PARMASK_IOBASE;
1096
1097         }
1098         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1099                 return -EFAULT;
1100         return 0;
1101 }
1102
1103 /* --------------------------------------------------------------------- */
1104
1105 static const struct net_device_ops baycom_netdev_ops = {
1106         .ndo_open            = epp_open,
1107         .ndo_stop            = epp_close,
1108         .ndo_do_ioctl        = baycom_ioctl,
1109         .ndo_start_xmit      = baycom_send_packet,
1110         .ndo_set_mac_address = baycom_set_mac_address,
1111 };
1112
1113 /*
1114  * Check for a network adaptor of this type, and return '0' if one exists.
1115  * If dev->base_addr == 0, probe all likely locations.
1116  * If dev->base_addr == 1, always return failure.
1117  * If dev->base_addr == 2, allocate space for the device and return success
1118  * (detachable devices only).
1119  */
1120 static void baycom_probe(struct net_device *dev)
1121 {
1122         const struct hdlcdrv_channel_params dflt_ch_params = {
1123                 20, 2, 10, 40, 0
1124         };
1125         struct baycom_state *bc;
1126
1127         /*
1128          * not a real probe! only initialize data structures
1129          */
1130         bc = netdev_priv(dev);
1131         /*
1132          * initialize the baycom_state struct
1133          */
1134         bc->ch_params = dflt_ch_params;
1135         bc->ptt_keyed = 0;
1136
1137         /*
1138          * initialize the device struct
1139          */
1140
1141         /* Fill in the fields of the device structure */
1142         bc->skb = NULL;
1143
1144         dev->netdev_ops = &baycom_netdev_ops;
1145         dev->header_ops = &ax25_header_ops;
1146
1147         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1148         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1149         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1150         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1151         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1152         memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1153         dev->tx_queue_len = 16;
1154
1155         /* New style flags */
1156         dev->flags = 0;
1157 }
1158
1159 /* --------------------------------------------------------------------- */
1160
1161 /*
1162  * command line settable parameters
1163  */
1164 static const char *mode[NR_PORTS] = { "", };
1165 static int iobase[NR_PORTS] = { 0x378, };
1166
1167 module_param_array(mode, charp, NULL, 0);
1168 MODULE_PARM_DESC(mode, "baycom operating mode");
1169 module_param_array(iobase, int, NULL, 0);
1170 MODULE_PARM_DESC(iobase, "baycom io base address");
1171
1172 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1173 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1174 MODULE_LICENSE("GPL");
1175
1176 /* --------------------------------------------------------------------- */
1177
1178 static void __init baycom_epp_dev_setup(struct net_device *dev)
1179 {
1180         struct baycom_state *bc = netdev_priv(dev);
1181
1182         /*
1183          * initialize part of the baycom_state struct
1184          */
1185         bc->dev = dev;
1186         bc->magic = BAYCOM_MAGIC;
1187         bc->cfg.fclk = 19666600;
1188         bc->cfg.bps = 9600;
1189         /*
1190          * initialize part of the device struct
1191          */
1192         baycom_probe(dev);
1193 }
1194
1195 static int __init init_baycomepp(void)
1196 {
1197         int i, found = 0;
1198         char set_hw = 1;
1199
1200         printk(bc_drvinfo);
1201         /*
1202          * register net devices
1203          */
1204         for (i = 0; i < NR_PORTS; i++) {
1205                 struct net_device *dev;
1206
1207                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1208                                    baycom_epp_dev_setup);
1209
1210                 if (!dev) {
1211                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1212                         return found ? 0 : -ENOMEM;
1213                 }
1214
1215                 sprintf(dev->name, "bce%d", i);
1216                 dev->base_addr = iobase[i];
1217
1218                 if (!mode[i])
1219                         set_hw = 0;
1220                 if (!set_hw)
1221                         iobase[i] = 0;
1222
1223                 if (register_netdev(dev)) {
1224                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1225                         free_netdev(dev);
1226                         break;
1227                 }
1228                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1229                         set_hw = 0;
1230                 baycom_device[i] = dev;
1231                 found++;
1232         }
1233
1234         return found ? 0 : -ENXIO;
1235 }
1236
1237 static void __exit cleanup_baycomepp(void)
1238 {
1239         int i;
1240
1241         for(i = 0; i < NR_PORTS; i++) {
1242                 struct net_device *dev = baycom_device[i];
1243
1244                 if (dev) {
1245                         struct baycom_state *bc = netdev_priv(dev);
1246                         if (bc->magic == BAYCOM_MAGIC) {
1247                                 unregister_netdev(dev);
1248                                 free_netdev(dev);
1249                         } else
1250                                 printk(paranoia_str, "cleanup_module");
1251                 }
1252         }
1253 }
1254
1255 module_init(init_baycomepp);
1256 module_exit(cleanup_baycomepp);
1257
1258 /* --------------------------------------------------------------------- */
1259
1260 #ifndef MODULE
1261
1262 /*
1263  * format: baycom_epp=io,mode
1264  * mode: fpga config options
1265  */
1266
1267 static int __init baycom_epp_setup(char *str)
1268 {
1269         static unsigned __initdata nr_dev = 0;
1270         int ints[2];
1271
1272         if (nr_dev >= NR_PORTS)
1273                 return 0;
1274         str = get_options(str, 2, ints);
1275         if (ints[0] < 1)
1276                 return 0;
1277         mode[nr_dev] = str;
1278         iobase[nr_dev] = ints[1];
1279         nr_dev++;
1280         return 1;
1281 }
1282
1283 __setup("baycom_epp=", baycom_epp_setup);
1284
1285 #endif /* MODULE */
1286 /* --------------------------------------------------------------------- */