drivers/net/hamradio/baycom_epp.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*****************************************************************************/
   3
   4 /*
   5  *      baycom_epp.c  -- baycom epp radio modem driver.
   6  *
   7  *      Copyright (C) 1998-2000
   8  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
   9  *
  10  *  Please note that the GPL allows you to use the driver, NOT the radio.
  11  *  In order to use the radio, you need a license from the communications
  12  *  authority of your country.
  13  *
  14  *  History:
  15  *   0.1  xx.xx.1998  Initial version by Matthias Welwarsky (dg2fef)
  16  *   0.2  21.04.1998  Massive rework by Thomas Sailer
  17  *                    Integrated FPGA EPP modem configuration routines
  18  *   0.3  11.05.1998  Took FPGA config out and moved it into a separate program
  19  *   0.4  26.07.1999  Adapted to new lowlevel parport driver interface
  20  *   0.5  03.08.1999  adapt to Linus' new __setup/__initcall
  21  *                    removed some pre-2.2 kernel compatibility cruft
  22  *   0.6  10.08.1999  Check if parport can do SPP and is safe to access during interrupt contexts
  23  *   0.7  12.02.2000  adapted to softnet driver interface
  24  */
  25
  26 /*****************************************************************************/
  27
  28 #include <linux/crc-ccitt.h>
  29 #include <linux/module.h>
  30 #include <linux/kernel.h>
  31 #include <linux/init.h>
  32 #include <linux/sched.h>
  33 #include <linux/string.h>
  34 #include <linux/workqueue.h>
  35 #include <linux/fs.h>
  36 #include <linux/parport.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/hdlcdrv.h>
  39 #include <linux/baycom.h>
  40 #include <linux/jiffies.h>
  41 #include <linux/random.h>
  42 #include <net/ax25.h>
  43 #include <linux/uaccess.h>
  44
  45 /* --------------------------------------------------------------------- */
  46
  47 #define BAYCOM_DEBUG
  48 #define BAYCOM_MAGIC 19730510
  49
  50 /* --------------------------------------------------------------------- */
  51
  52 static const char paranoia_str[] = KERN_ERR
  53         "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
  54
  55 static const char bc_drvname[] = "baycom_epp";
  56 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
  57 "baycom_epp: version 0.7\n";
  58
  59 /* --------------------------------------------------------------------- */
  60
  61 #define NR_PORTS 4
  62
  63 static struct net_device *baycom_device[NR_PORTS];
  64
  65 /* --------------------------------------------------------------------- */
  66
  67 /* EPP status register */
  68 #define EPP_DCDBIT      0x80
  69 #define EPP_PTTBIT      0x08
  70 #define EPP_NREF        0x01
  71 #define EPP_NRAEF       0x02
  72 #define EPP_NRHF        0x04
  73 #define EPP_NTHF        0x20
  74 #define EPP_NTAEF       0x10
  75 #define EPP_NTEF        EPP_PTTBIT
  76
  77 /* EPP control register */
  78 #define EPP_TX_FIFO_ENABLE 0x10
  79 #define EPP_RX_FIFO_ENABLE 0x08
  80 #define EPP_MODEM_ENABLE   0x20
  81 #define EPP_LEDS           0xC0
  82 #define EPP_IRQ_ENABLE     0x10
  83
  84 /* LPT registers */
  85 #define LPTREG_ECONTROL       0x402
  86 #define LPTREG_CONFIGB        0x401
  87 #define LPTREG_CONFIGA        0x400
  88 #define LPTREG_EPPDATA        0x004
  89 #define LPTREG_EPPADDR        0x003
  90 #define LPTREG_CONTROL        0x002
  91 #define LPTREG_STATUS         0x001
  92 #define LPTREG_DATA           0x000
  93
  94 /* LPT control register */
  95 #define LPTCTRL_PROGRAM       0x04   /* 0 to reprogram */
  96 #define LPTCTRL_WRITE         0x01
  97 #define LPTCTRL_ADDRSTB       0x08
  98 #define LPTCTRL_DATASTB       0x02
  99 #define LPTCTRL_INTEN         0x10
 100
 101 /* LPT status register */
 102 #define LPTSTAT_SHIFT_NINTR   6
 103 #define LPTSTAT_WAIT          0x80
 104 #define LPTSTAT_NINTR         (1<<LPTSTAT_SHIFT_NINTR)
 105 #define LPTSTAT_PE            0x20
 106 #define LPTSTAT_DONE          0x10
 107 #define LPTSTAT_NERROR        0x08
 108 #define LPTSTAT_EPPTIMEOUT    0x01
 109
 110 /* LPT data register */
 111 #define LPTDATA_SHIFT_TDI     0
 112 #define LPTDATA_SHIFT_TMS     2
 113 #define LPTDATA_TDI           (1<<LPTDATA_SHIFT_TDI)
 114 #define LPTDATA_TCK           0x02
 115 #define LPTDATA_TMS           (1<<LPTDATA_SHIFT_TMS)
 116 #define LPTDATA_INITBIAS      0x80
 117
 118
 119 /* EPP modem config/status bits */
 120 #define EPP_DCDBIT            0x80
 121 #define EPP_PTTBIT            0x08
 122 #define EPP_RXEBIT            0x01
 123 #define EPP_RXAEBIT           0x02
 124 #define EPP_RXHFULL           0x04
 125
 126 #define EPP_NTHF              0x20
 127 #define EPP_NTAEF             0x10
 128 #define EPP_NTEF              EPP_PTTBIT
 129
 130 #define EPP_TX_FIFO_ENABLE    0x10
 131 #define EPP_RX_FIFO_ENABLE    0x08
 132 #define EPP_MODEM_ENABLE      0x20
 133 #define EPP_LEDS              0xC0
 134 #define EPP_IRQ_ENABLE        0x10
 135
 136 /* Xilinx 4k JTAG instructions */
 137 #define XC4K_IRLENGTH   3
 138 #define XC4K_EXTEST     0
 139 #define XC4K_PRELOAD    1
 140 #define XC4K_CONFIGURE  5
 141 #define XC4K_BYPASS     7
 142
 143 #define EPP_CONVENTIONAL  0
 144 #define EPP_FPGA          1
 145 #define EPP_FPGAEXTSTATUS 2
 146
 147 #define TXBUFFER_SIZE     ((HDLCDRV_MAXFLEN*6/5)+8)
 148
 149 /* ---------------------------------------------------------------------- */
 150 /*
 151  * Information that need to be kept for each board.
 152  */
 153
 154 struct baycom_state {
 155         int magic;
 156
 157         struct pardevice *pdev;
 158         struct net_device *dev;
 159         unsigned int work_running;
 160         struct delayed_work run_work;
 161         unsigned int modem;
 162         unsigned int bitrate;
 163         unsigned char stat;
 164
 165         struct {
 166                 unsigned int intclk;
 167                 unsigned int fclk;
 168                 unsigned int bps;
 169                 unsigned int extmodem;
 170                 unsigned int loopback;
 171         } cfg;
 172
 173         struct hdlcdrv_channel_params ch_params;
 174
 175         struct {
 176                 unsigned int bitbuf, bitstream, numbits, state;
 177                 unsigned char *bufptr;
 178                 int bufcnt;
 179                 unsigned char buf[TXBUFFER_SIZE];
 180         } hdlcrx;
 181
 182         struct {
 183                 int calibrate;
 184                 int slotcnt;
 185                 int flags;
 186                 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
 187                 unsigned char *bufptr;
 188                 int bufcnt;
 189                 unsigned char buf[TXBUFFER_SIZE];
 190         } hdlctx;
 191
 192         unsigned int ptt_keyed;
 193         struct sk_buff *skb;  /* next transmit packet  */
 194
 195 #ifdef BAYCOM_DEBUG
 196         struct debug_vals {
 197                 unsigned long last_jiffies;
 198                 unsigned cur_intcnt;
 199                 unsigned last_intcnt;
 200                 int cur_pllcorr;
 201                 int last_pllcorr;
 202                 unsigned int mod_cycles;
 203                 unsigned int demod_cycles;
 204         } debug_vals;
 205 #endif /* BAYCOM_DEBUG */
 206 };
 207
 208 /* --------------------------------------------------------------------- */
 209
 210 #define KISS_VERBOSE
 211
 212 /* --------------------------------------------------------------------- */
 213
 214 #define PARAM_TXDELAY   1
 215 #define PARAM_PERSIST   2
 216 #define PARAM_SLOTTIME  3
 217 #define PARAM_TXTAIL    4
 218 #define PARAM_FULLDUP   5
 219 #define PARAM_HARDWARE  6
 220 #define PARAM_RETURN    255
 221
 222 /* --------------------------------------------------------------------- */
 223 /*
 224  * the CRC routines are stolen from WAMPES
 225  * by Dieter Deyke
 226  */
 227
 228
 229 /*---------------------------------------------------------------------------*/
 230
 231 #if 0
 232 static inline void append_crc_ccitt(unsigned char *buffer, int len)
 233 {
 234         unsigned int crc = 0xffff;
 235
 236         for (;len>0;len--)
 237                 crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
 238         crc ^= 0xffff;
 239         *buffer++ = crc;
 240         *buffer++ = crc >> 8;
 241 }
 242 #endif
 243
 244 /*---------------------------------------------------------------------------*/
 245
 246 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
 247 {
 248         return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
 249 }
 250
 251 /*---------------------------------------------------------------------------*/
 252
 253 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
 254 {
 255         return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
 256 }
 257
 258 /* ---------------------------------------------------------------------- */
 259
 260 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
 261
 262 /* --------------------------------------------------------------------- */
 263
 264 static inline void baycom_int_freq(struct baycom_state *bc)
 265 {
 266 #ifdef BAYCOM_DEBUG
 267         unsigned long cur_jiffies = jiffies;
 268         /*
 269          * measure the interrupt frequency
 270          */
 271         bc->debug_vals.cur_intcnt++;
 272         if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
 273                 bc->debug_vals.last_jiffies = cur_jiffies;
 274                 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
 275                 bc->debug_vals.cur_intcnt = 0;
 276                 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
 277                 bc->debug_vals.cur_pllcorr = 0;
 278         }
 279 #endif /* BAYCOM_DEBUG */
 280 }
 281
 282 /* ---------------------------------------------------------------------- */
 283 /*
 284  *    eppconfig_path should be setable  via /proc/sys.
 285  */
 286
 287 static char const eppconfig_path[] = "/usr/sbin/eppfpga";
 288
 289 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 290
 291 /* eppconfig: called during ifconfig up to configure the modem */
 292 static int eppconfig(struct baycom_state *bc)
 293 {
 294         char modearg[256];
 295         char portarg[16];
 296         char *argv[] = {
 297                 (char *)eppconfig_path,
 298                 "-s",
 299                 "-p", portarg,
 300                 "-m", modearg,
 301                 NULL };
 302
 303         /* set up arguments */
 304         sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
 305                 bc->cfg.intclk ? "int" : "ext",
 306                 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
 307                 (bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
 308                 bc->cfg.loopback ? ",loopback" : "");
 309         sprintf(portarg, "%ld", bc->pdev->port->base);
 310         printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
 311
 312         return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC);
 313 }
 314
 315 /* ---------------------------------------------------------------------- */
 316
 317 static inline void do_kiss_params(struct baycom_state *bc,
 318                                   unsigned char *data, unsigned long len)
 319 {
 320
 321 #ifdef KISS_VERBOSE
 322 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
 323 #else /* KISS_VERBOSE */
 324 #define PKP(a,b)
 325 #endif /* KISS_VERBOSE */
 326
 327         if (len < 2)
 328                 return;
 329         switch(data[0]) {
 330         case PARAM_TXDELAY:
 331                 bc->ch_params.tx_delay = data[1];
 332                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
 333                 break;
 334         case PARAM_PERSIST:
 335                 bc->ch_params.ppersist = data[1];
 336                 PKP("p persistence = %u", bc->ch_params.ppersist);
 337                 break;
 338         case PARAM_SLOTTIME:
 339                 bc->ch_params.slottime = data[1];
 340                 PKP("slot time = %ums", bc->ch_params.slottime);
 341                 break;
 342         case PARAM_TXTAIL:
 343                 bc->ch_params.tx_tail = data[1];
 344                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
 345                 break;
 346         case PARAM_FULLDUP:
 347                 bc->ch_params.fulldup = !!data[1];
 348                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
 349                 break;
 350         default:
 351                 break;
 352         }
 353 #undef PKP
 354 }
 355
 356 /* --------------------------------------------------------------------- */
 357
 358 static void encode_hdlc(struct baycom_state *bc)
 359 {
 360         struct sk_buff *skb;
 361         unsigned char *wp, *bp;
 362         int pkt_len;
 363         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
 364         unsigned char crcarr[2];
 365         int j;
 366
 367         if (bc->hdlctx.bufcnt > 0)
 368                 return;
 369         skb = bc->skb;
 370         if (!skb)
 371                 return;
 372         bc->skb = NULL;
 373         pkt_len = skb->len-1; /* strip KISS byte */
 374         wp = bc->hdlctx.buf;
 375         bp = skb->data+1;
 376         crc = calc_crc_ccitt(bp, pkt_len);
 377         crcarr[0] = crc;
 378         crcarr[1] = crc >> 8;
 379         *wp++ = 0x7e;
 380         bitstream = bitbuf = numbit = 0;
 381         while (pkt_len > -2) {
 382                 bitstream >>= 8;
 383                 bitstream |= ((unsigned int)*bp) << 8;
 384                 bitbuf |= ((unsigned int)*bp) << numbit;
 385                 notbitstream = ~bitstream;
 386                 bp++;
 387                 pkt_len--;
 388                 if (!pkt_len)
 389                         bp = crcarr;
 390                 for (j = 0; j < 8; j++)
 391                         if (unlikely(!(notbitstream & (0x1f0 << 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                         }
 398                 numbit += 8;
 399                 while (numbit >= 8) {
 400                         *wp++ = bitbuf;
 401                         bitbuf >>= 8;
 402                         numbit -= 8;
 403                 }
 404         }
 405         bitbuf |= 0x7e7e << numbit;
 406         numbit += 16;
 407         while (numbit >= 8) {
 408                 *wp++ = bitbuf;
 409                 bitbuf >>= 8;
 410                 numbit -= 8;
 411         }
 412         bc->hdlctx.bufptr = bc->hdlctx.buf;
 413         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
 414         dev_kfree_skb(skb);
 415         bc->dev->stats.tx_packets++;
 416 }
 417
 418 /* ---------------------------------------------------------------------- */
 419
 420 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
 421 {
 422         struct parport *pp = bc->pdev->port;
 423         unsigned char tmp[128];
 424         int i, j;
 425
 426         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
 427                 bc->hdlctx.state = tx_idle;
 428         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
 429                 if (bc->hdlctx.bufcnt <= 0)
 430                         encode_hdlc(bc);
 431                 if (bc->hdlctx.bufcnt <= 0)
 432                         return 0;
 433                 if (!bc->ch_params.fulldup) {
 434                         if (!(stat & EPP_DCDBIT)) {
 435                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
 436                                 return 0;
 437                         }
 438                         if ((--bc->hdlctx.slotcnt) > 0)
 439                                 return 0;
 440                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 441                         if ((prandom_u32() % 256) > bc->ch_params.ppersist)
 442                                 return 0;
 443                 }
 444         }
 445         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
 446                 bc->hdlctx.state = tx_keyup;
 447                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
 448                 bc->ptt_keyed++;
 449         }
 450         while (cnt > 0) {
 451                 switch (bc->hdlctx.state) {
 452                 case tx_keyup:
 453                         i = min_t(int, cnt, bc->hdlctx.flags);
 454                         cnt -= i;
 455                         bc->hdlctx.flags -= i;
 456                         if (bc->hdlctx.flags <= 0)
 457                                 bc->hdlctx.state = tx_data;
 458                         memset(tmp, 0x7e, sizeof(tmp));
 459                         while (i > 0) {
 460                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 461                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 462                                         return -1;
 463                                 i -= j;
 464                         }
 465                         break;
 466
 467                 case tx_data:
 468                         if (bc->hdlctx.bufcnt <= 0) {
 469                                 encode_hdlc(bc);
 470                                 if (bc->hdlctx.bufcnt <= 0) {
 471                                         bc->hdlctx.state = tx_tail;
 472                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
 473                                         break;
 474                                 }
 475                         }
 476                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
 477                         bc->hdlctx.bufcnt -= i;
 478                         cnt -= i;
 479                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
 480                                         return -1;
 481                         bc->hdlctx.bufptr += i;
 482                         break;
 483
 484                 case tx_tail:
 485                         encode_hdlc(bc);
 486                         if (bc->hdlctx.bufcnt > 0) {
 487                                 bc->hdlctx.state = tx_data;
 488                                 break;
 489                         }
 490                         i = min_t(int, cnt, bc->hdlctx.flags);
 491                         if (i) {
 492                                 cnt -= i;
 493                                 bc->hdlctx.flags -= i;
 494                                 memset(tmp, 0x7e, sizeof(tmp));
 495                                 while (i > 0) {
 496                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 497                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 498                                                 return -1;
 499                                         i -= j;
 500                                 }
 501                                 break;
 502                         }
 503                         fallthrough;
 504
 505                 default:
 506                         if (bc->hdlctx.calibrate <= 0)
 507                                 return 0;
 508                         i = min_t(int, cnt, bc->hdlctx.calibrate);
 509                         cnt -= i;
 510                         bc->hdlctx.calibrate -= i;
 511                         memset(tmp, 0, sizeof(tmp));
 512                         while (i > 0) {
 513                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
 514                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
 515                                         return -1;
 516                                 i -= j;
 517                         }
 518                         break;
 519                 }
 520         }
 521         return 0;
 522 }
 523
 524 /* ---------------------------------------------------------------------- */
 525
 526 static void do_rxpacket(struct net_device *dev)
 527 {
 528         struct baycom_state *bc = netdev_priv(dev);
 529         struct sk_buff *skb;
 530         unsigned char *cp;
 531         unsigned pktlen;
 532
 533         if (bc->hdlcrx.bufcnt < 4)
 534                 return;
 535         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
 536                 return;
 537         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
 538         if (!(skb = dev_alloc_skb(pktlen))) {
 539                 printk("%s: memory squeeze, dropping packet\n", dev->name);
 540                 dev->stats.rx_dropped++;
 541                 return;
 542         }
 543         cp = skb_put(skb, pktlen);
 544         *cp++ = 0; /* KISS kludge */
 545         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
 546         skb->protocol = ax25_type_trans(skb, dev);
 547         netif_rx(skb);
 548         dev->stats.rx_packets++;
 549 }
 550
 551 static int receive(struct net_device *dev, int cnt)
 552 {
 553         struct baycom_state *bc = netdev_priv(dev);
 554         struct parport *pp = bc->pdev->port;
 555         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
 556         unsigned char tmp[128];
 557         unsigned char *cp;
 558         int cnt2, ret = 0;
 559         int j;
 560
 561         numbits = bc->hdlcrx.numbits;
 562         state = bc->hdlcrx.state;
 563         bitstream = bc->hdlcrx.bitstream;
 564         bitbuf = bc->hdlcrx.bitbuf;
 565         while (cnt > 0) {
 566                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
 567                 cnt -= cnt2;
 568                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
 569                         ret = -1;
 570                         break;
 571                 }
 572                 cp = tmp;
 573                 for (; cnt2 > 0; cnt2--, cp++) {
 574                         bitstream >>= 8;
 575                         bitstream |= (*cp) << 8;
 576                         bitbuf >>= 8;
 577                         bitbuf |= (*cp) << 8;
 578                         numbits += 8;
 579                         notbitstream = ~bitstream;
 580                         for (j = 0; j < 8; j++) {
 581
 582                                 /* flag or abort */
 583                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
 584
 585                                         /* abort received */
 586                                         if (!(notbitstream & (0x1fc << j)))
 587                                                 state = 0;
 588
 589                                         /* flag received */
 590                                         else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) {
 591                                                 if (state)
 592                                                         do_rxpacket(dev);
 593                                                 bc->hdlcrx.bufcnt = 0;
 594                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
 595                                                 state = 1;
 596                                                 numbits = 7-j;
 597                                         }
 598                                 }
 599
 600                                 /* stuffed bit */
 601                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
 602                                         numbits--;
 603                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
 604                                         }
 605                                 }
 606                         while (state && numbits >= 8) {
 607                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
 608                                         state = 0;
 609                                 } else {
 610                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
 611                                         bc->hdlcrx.bufcnt++;
 612                                         numbits -= 8;
 613                                 }
 614                         }
 615                 }
 616         }
 617         bc->hdlcrx.numbits = numbits;
 618         bc->hdlcrx.state = state;
 619         bc->hdlcrx.bitstream = bitstream;
 620         bc->hdlcrx.bitbuf = bitbuf;
 621         return ret;
 622 }
 623
 624 /* --------------------------------------------------------------------- */
 625
 626 #ifdef __i386__
 627 #include <asm/msr.h>
 628 #define GETTICK(x)                                              \
 629 ({                                                              \
 630         if (boot_cpu_has(X86_FEATURE_TSC))                      \
 631                 x = (unsigned int)rdtsc();                      \
 632 })
 633 #else /* __i386__ */
 634 #define GETTICK(x)
 635 #endif /* __i386__ */
 636
 637 static void epp_bh(struct work_struct *work)
 638 {
 639         struct net_device *dev;
 640         struct baycom_state *bc;
 641         struct parport *pp;
 642         unsigned char stat;
 643         unsigned char tmp[2];
 644         unsigned int time1 = 0, time2 = 0, time3 = 0;
 645         int cnt, cnt2;
 646
 647         bc = container_of(work, struct baycom_state, run_work.work);
 648         dev = bc->dev;
 649         if (!bc->work_running)
 650                 return;
 651         baycom_int_freq(bc);
 652         pp = bc->pdev->port;
 653         /* update status */
 654         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 655                 goto epptimeout;
 656         bc->stat = stat;
 657         bc->debug_vals.last_pllcorr = stat;
 658         GETTICK(time1);
 659         if (bc->modem == EPP_FPGAEXTSTATUS) {
 660                 /* get input count */
 661                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
 662                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 663                         goto epptimeout;
 664                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 665                         goto epptimeout;
 666                 cnt = tmp[0] | (tmp[1] << 8);
 667                 cnt &= 0x7fff;
 668                 /* get output count */
 669                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
 670                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 671                         goto epptimeout;
 672                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
 673                         goto epptimeout;
 674                 cnt2 = tmp[0] | (tmp[1] << 8);
 675                 cnt2 = 16384 - (cnt2 & 0x7fff);
 676                 /* return to normal */
 677                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 678                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 679                         goto epptimeout;
 680                 if (transmit(bc, cnt2, stat))
 681                         goto epptimeout;
 682                 GETTICK(time2);
 683                 if (receive(dev, cnt))
 684                         goto epptimeout;
 685                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 686                         goto epptimeout;
 687                 bc->stat = stat;
 688         } else {
 689                 /* try to tx */
 690                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
 691                 case EPP_NTHF:
 692                         cnt = 2048 - 256;
 693                         break;
 694
 695                 case EPP_NTAEF:
 696                         cnt = 2048 - 1793;
 697                         break;
 698
 699                 case 0:
 700                         cnt = 0;
 701                         break;
 702
 703                 default:
 704                         cnt = 2048 - 1025;
 705                         break;
 706                 }
 707                 if (transmit(bc, cnt, stat))
 708                         goto epptimeout;
 709                 GETTICK(time2);
 710                 /* do receiver */
 711                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
 712                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
 713                         case EPP_NRAEF:
 714                                 cnt = 1025;
 715                                 break;
 716
 717                         case 0:
 718                                 cnt = 1793;
 719                                 break;
 720
 721                         default:
 722                                 cnt = 256;
 723                                 break;
 724                         }
 725                         if (receive(dev, cnt))
 726                                 goto epptimeout;
 727                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 728                                 goto epptimeout;
 729                 }
 730                 cnt = 0;
 731                 if (bc->bitrate < 50000)
 732                         cnt = 256;
 733                 else if (bc->bitrate < 100000)
 734                         cnt = 128;
 735                 while (cnt > 0 && stat & EPP_NREF) {
 736                         if (receive(dev, 1))
 737                                 goto epptimeout;
 738                         cnt--;
 739                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 740                                 goto epptimeout;
 741                 }
 742         }
 743         GETTICK(time3);
 744 #ifdef BAYCOM_DEBUG
 745         bc->debug_vals.mod_cycles = time2 - time1;
 746         bc->debug_vals.demod_cycles = time3 - time2;
 747 #endif /* BAYCOM_DEBUG */
 748         schedule_delayed_work(&bc->run_work, 1);
 749         if (!bc->skb)
 750                 netif_wake_queue(dev);
 751         return;
 752  epptimeout:
 753         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
 754 }
 755
 756 /* ---------------------------------------------------------------------- */
 757 /*
 758  * ===================== network driver interface =========================
 759  */
 760
 761 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
 762 {
 763         struct baycom_state *bc = netdev_priv(dev);
 764
 765         if (skb->protocol == htons(ETH_P_IP))
 766                 return ax25_ip_xmit(skb);
 767
 768         if (skb->data[0] != 0) {
 769                 do_kiss_params(bc, skb->data, skb->len);
 770                 dev_kfree_skb(skb);
 771                 return NETDEV_TX_OK;
 772         }
 773         if (bc->skb) {
 774                 dev_kfree_skb(skb);
 775                 return NETDEV_TX_OK;
 776         }
 777         /* strip KISS byte */
 778         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
 779                 dev_kfree_skb(skb);
 780                 return NETDEV_TX_OK;
 781         }
 782         netif_stop_queue(dev);
 783         bc->skb = skb;
 784         return NETDEV_TX_OK;
 785 }
 786
 787 /* --------------------------------------------------------------------- */
 788
 789 static int baycom_set_mac_address(struct net_device *dev, void *addr)
 790 {
 791         struct sockaddr *sa = (struct sockaddr *)addr;
 792
 793         /* addr is an AX.25 shifted ASCII mac address */
 794         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 795         return 0;
 796 }
 797
 798 /* --------------------------------------------------------------------- */
 799
 800 static void epp_wakeup(void *handle)
 801 {
 802         struct net_device *dev = (struct net_device *)handle;
 803         struct baycom_state *bc = netdev_priv(dev);
 804
 805         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
 806         if (!parport_claim(bc->pdev))
 807                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
 808 }
 809
 810 /* --------------------------------------------------------------------- */
 811
 812 /*
 813  * Open/initialize the board. This is called (in the current kernel)
 814  * sometime after booting when the 'ifconfig' program is run.
 815  *
 816  * This routine should set everything up anew at each open, even
 817  * registers that "should" only need to be set once at boot, so that
 818  * there is non-reboot way to recover if something goes wrong.
 819  */
 820
 821 static int epp_open(struct net_device *dev)
 822 {
 823         struct baycom_state *bc = netdev_priv(dev);
 824         struct parport *pp = parport_find_base(dev->base_addr);
 825         unsigned int i, j;
 826         unsigned char tmp[128];
 827         unsigned char stat;
 828         unsigned long tstart;
 829         struct pardev_cb par_cb;
 830
 831         if (!pp) {
 832                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
 833                 return -ENXIO;
 834         }
 835 #if 0
 836         if (pp->irq < 0) {
 837                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
 838                 parport_put_port(pp);
 839                 return -ENXIO;
 840         }
 841 #endif
 842         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
 843                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
 844                        bc_drvname, pp->base);
 845                 parport_put_port(pp);
 846                 return -EIO;
 847         }
 848         memset(&bc->modem, 0, sizeof(bc->modem));
 849         memset(&par_cb, 0, sizeof(par_cb));
 850         par_cb.wakeup = epp_wakeup;
 851         par_cb.private = (void *)dev;
 852         par_cb.flags = PARPORT_DEV_EXCL;
 853         for (i = 0; i < NR_PORTS; i++)
 854                 if (baycom_device[i] == dev)
 855                         break;
 856
 857         if (i == NR_PORTS) {
 858                 pr_err("%s: no device found\n", bc_drvname);
 859                 parport_put_port(pp);
 860                 return -ENODEV;
 861         }
 862
 863         bc->pdev = parport_register_dev_model(pp, dev->name, &par_cb, i);
 864         parport_put_port(pp);
 865         if (!bc->pdev) {
 866                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
 867                 return -ENXIO;
 868         }
 869         if (parport_claim(bc->pdev)) {
 870                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
 871                 parport_unregister_device(bc->pdev);
 872                 return -EBUSY;
 873         }
 874         dev->irq = /*pp->irq*/ 0;
 875         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
 876         bc->work_running = 1;
 877         bc->modem = EPP_CONVENTIONAL;
 878         if (eppconfig(bc))
 879                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
 880         else
 881                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
 882         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
 883         /* reset the modem */
 884         tmp[0] = 0;
 885         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
 886         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
 887                 goto epptimeout;
 888         /* autoprobe baud rate */
 889         tstart = jiffies;
 890         i = 0;
 891         while (time_before(jiffies, tstart + HZ/3)) {
 892                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 893                         goto epptimeout;
 894                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
 895                         schedule();
 896                         continue;
 897                 }
 898                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 899                         goto epptimeout;
 900                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
 901                         goto epptimeout;
 902                 i += 256;
 903         }
 904         for (j = 0; j < 256; j++) {
 905                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
 906                         goto epptimeout;
 907                 if (!(stat & EPP_NREF))
 908                         break;
 909                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
 910                         goto epptimeout;
 911                 i++;
 912         }
 913         tstart = jiffies - tstart;
 914         bc->bitrate = i * (8 * HZ) / tstart;
 915         j = 1;
 916         i = bc->bitrate >> 3;
 917         while (j < 7 && i > 150) {
 918                 j++;
 919                 i >>= 1;
 920         }
 921         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
 922                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
 923         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
 924         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
 925                 goto epptimeout;
 926         /*
 927          * initialise hdlc variables
 928          */
 929         bc->hdlcrx.state = 0;
 930         bc->hdlcrx.numbits = 0;
 931         bc->hdlctx.state = tx_idle;
 932         bc->hdlctx.bufcnt = 0;
 933         bc->hdlctx.slotcnt = bc->ch_params.slottime;
 934         bc->hdlctx.calibrate = 0;
 935         /* start the bottom half stuff */
 936         schedule_delayed_work(&bc->run_work, 1);
 937         netif_start_queue(dev);
 938         return 0;
 939
 940  epptimeout:
 941         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
 942         parport_write_control(pp, 0); /* reset the adapter */
 943         parport_release(bc->pdev);
 944         parport_unregister_device(bc->pdev);
 945         return -EIO;
 946 }
 947
 948 /* --------------------------------------------------------------------- */
 949
 950 static int epp_close(struct net_device *dev)
 951 {
 952         struct baycom_state *bc = netdev_priv(dev);
 953         struct parport *pp = bc->pdev->port;
 954         unsigned char tmp[1];
 955
 956         bc->work_running = 0;
 957         cancel_delayed_work_sync(&bc->run_work);
 958         bc->stat = EPP_DCDBIT;
 959         tmp[0] = 0;
 960         pp->ops->epp_write_addr(pp, tmp, 1, 0);
 961         parport_write_control(pp, 0); /* reset the adapter */
 962         parport_release(bc->pdev);
 963         parport_unregister_device(bc->pdev);
 964         dev_kfree_skb(bc->skb);
 965         bc->skb = NULL;
 966         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
 967                bc_drvname, dev->base_addr, dev->irq);
 968         return 0;
 969 }
 970
 971 /* --------------------------------------------------------------------- */
 972
 973 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
 974 {
 975         const char *cp;
 976
 977         if (strstr(modestr,"intclk"))
 978                 bc->cfg.intclk = 1;
 979         if (strstr(modestr,"extclk"))
 980                 bc->cfg.intclk = 0;
 981         if (strstr(modestr,"intmodem"))
 982                 bc->cfg.extmodem = 0;
 983         if (strstr(modestr,"extmodem"))
 984                 bc->cfg.extmodem = 1;
 985         if (strstr(modestr,"noloopback"))
 986                 bc->cfg.loopback = 0;
 987         if (strstr(modestr,"loopback"))
 988                 bc->cfg.loopback = 1;
 989         if ((cp = strstr(modestr,"fclk="))) {
 990                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
 991                 if (bc->cfg.fclk < 1000000)
 992                         bc->cfg.fclk = 1000000;
 993                 if (bc->cfg.fclk > 25000000)
 994                         bc->cfg.fclk = 25000000;
 995         }
 996         if ((cp = strstr(modestr,"bps="))) {
 997                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
 998                 if (bc->cfg.bps < 1000)
 999                         bc->cfg.bps = 1000;
1000                 if (bc->cfg.bps > 1500000)
1001                         bc->cfg.bps = 1500000;
1002         }
1003         return 0;
1004 }
1005
1006 /* --------------------------------------------------------------------- */
1007
1008 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1009 {
1010         struct baycom_state *bc = netdev_priv(dev);
1011         struct hdlcdrv_ioctl hi;
1012
1013         if (cmd != SIOCDEVPRIVATE)
1014                 return -ENOIOCTLCMD;
1015
1016         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1017                 return -EFAULT;
1018         switch (hi.cmd) {
1019         default:
1020                 return -ENOIOCTLCMD;
1021
1022         case HDLCDRVCTL_GETCHANNELPAR:
1023                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1024                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1025                 hi.data.cp.slottime = bc->ch_params.slottime;
1026                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1027                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1028                 break;
1029
1030         case HDLCDRVCTL_SETCHANNELPAR:
1031                 if (!capable(CAP_NET_ADMIN))
1032                         return -EACCES;
1033                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1034                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1035                 bc->ch_params.slottime = hi.data.cp.slottime;
1036                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1037                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1038                 bc->hdlctx.slotcnt = 1;
1039                 return 0;
1040
1041         case HDLCDRVCTL_GETMODEMPAR:
1042                 hi.data.mp.iobase = dev->base_addr;
1043                 hi.data.mp.irq = dev->irq;
1044                 hi.data.mp.dma = dev->dma;
1045                 hi.data.mp.dma2 = 0;
1046                 hi.data.mp.seriobase = 0;
1047                 hi.data.mp.pariobase = 0;
1048                 hi.data.mp.midiiobase = 0;
1049                 break;
1050
1051         case HDLCDRVCTL_SETMODEMPAR:
1052                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1053                         return -EACCES;
1054                 dev->base_addr = hi.data.mp.iobase;
1055                 dev->irq = /*hi.data.mp.irq*/0;
1056                 dev->dma = /*hi.data.mp.dma*/0;
1057                 return 0;
1058
1059         case HDLCDRVCTL_GETSTAT:
1060                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1061                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1062                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1063                 hi.data.cs.tx_packets = dev->stats.tx_packets;
1064                 hi.data.cs.tx_errors = dev->stats.tx_errors;
1065                 hi.data.cs.rx_packets = dev->stats.rx_packets;
1066                 hi.data.cs.rx_errors = dev->stats.rx_errors;
1067                 break;
1068
1069         case HDLCDRVCTL_OLDGETSTAT:
1070                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1071                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1072                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1073                 break;
1074
1075         case HDLCDRVCTL_CALIBRATE:
1076                 if (!capable(CAP_SYS_RAWIO))
1077                         return -EACCES;
1078                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1079                 return 0;
1080
1081         case HDLCDRVCTL_DRIVERNAME:
1082                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1083                 break;
1084
1085         case HDLCDRVCTL_GETMODE:
1086                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1087                         bc->cfg.intclk ? "int" : "ext",
1088                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1089                         bc->cfg.loopback ? ",loopback" : "");
1090                 break;
1091
1092         case HDLCDRVCTL_SETMODE:
1093                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1094                         return -EACCES;
1095                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1096                 return baycom_setmode(bc, hi.data.modename);
1097
1098         case HDLCDRVCTL_MODELIST:
1099                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1100                         sizeof(hi.data.modename));
1101                 break;
1102
1103         case HDLCDRVCTL_MODEMPARMASK:
1104                 return HDLCDRV_PARMASK_IOBASE;
1105
1106         }
1107         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1108                 return -EFAULT;
1109         return 0;
1110 }
1111
1112 /* --------------------------------------------------------------------- */
1113
1114 static const struct net_device_ops baycom_netdev_ops = {
1115         .ndo_open            = epp_open,
1116         .ndo_stop            = epp_close,
1117         .ndo_do_ioctl        = baycom_ioctl,
1118         .ndo_start_xmit      = baycom_send_packet,
1119         .ndo_set_mac_address = baycom_set_mac_address,
1120 };
1121
1122 /*
1123  * Check for a network adaptor of this type, and return '0' if one exists.
1124  * If dev->base_addr == 0, probe all likely locations.
1125  * If dev->base_addr == 1, always return failure.
1126  * If dev->base_addr == 2, allocate space for the device and return success
1127  * (detachable devices only).
1128  */
1129 static void baycom_probe(struct net_device *dev)
1130 {
1131         const struct hdlcdrv_channel_params dflt_ch_params = {
1132                 20, 2, 10, 40, 0
1133         };
1134         struct baycom_state *bc;
1135
1136         /*
1137          * not a real probe! only initialize data structures
1138          */
1139         bc = netdev_priv(dev);
1140         /*
1141          * initialize the baycom_state struct
1142          */
1143         bc->ch_params = dflt_ch_params;
1144         bc->ptt_keyed = 0;
1145
1146         /*
1147          * initialize the device struct
1148          */
1149
1150         /* Fill in the fields of the device structure */
1151         bc->skb = NULL;
1152
1153         dev->netdev_ops = &baycom_netdev_ops;
1154         dev->header_ops = &ax25_header_ops;
1155
1156         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1157         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1158         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1159         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1160         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1161         memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1162         dev->tx_queue_len = 16;
1163
1164         /* New style flags */
1165         dev->flags = 0;
1166 }
1167
1168 /* --------------------------------------------------------------------- */
1169
1170 /*
1171  * command line settable parameters
1172  */
1173 static char *mode[NR_PORTS] = { "", };
1174 static int iobase[NR_PORTS] = { 0x378, };
1175
1176 module_param_array(mode, charp, NULL, 0);
1177 MODULE_PARM_DESC(mode, "baycom operating mode");
1178 module_param_hw_array(iobase, int, ioport, NULL, 0);
1179 MODULE_PARM_DESC(iobase, "baycom io base address");
1180
1181 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1182 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1183 MODULE_LICENSE("GPL");
1184
1185 /* --------------------------------------------------------------------- */
1186
1187 static int baycom_epp_par_probe(struct pardevice *par_dev)
1188 {
1189         struct device_driver *drv = par_dev->dev.driver;
1190         int len = strlen(drv->name);
1191
1192         if (strncmp(par_dev->name, drv->name, len))
1193                 return -ENODEV;
1194
1195         return 0;
1196 }
1197
1198 static struct parport_driver baycom_epp_par_driver = {
1199         .name = "bce",
1200         .probe = baycom_epp_par_probe,
1201         .devmodel = true,
1202 };
1203
1204 static void __init baycom_epp_dev_setup(struct net_device *dev)
1205 {
1206         struct baycom_state *bc = netdev_priv(dev);
1207
1208         /*
1209          * initialize part of the baycom_state struct
1210          */
1211         bc->dev = dev;
1212         bc->magic = BAYCOM_MAGIC;
1213         bc->cfg.fclk = 19666600;
1214         bc->cfg.bps = 9600;
1215         /*
1216          * initialize part of the device struct
1217          */
1218         baycom_probe(dev);
1219 }
1220
1221 static int __init init_baycomepp(void)
1222 {
1223         int i, found = 0, ret;
1224         char set_hw = 1;
1225
1226         printk(bc_drvinfo);
1227
1228         ret = parport_register_driver(&baycom_epp_par_driver);
1229         if (ret)
1230                 return ret;
1231
1232         /*
1233          * register net devices
1234          */
1235         for (i = 0; i < NR_PORTS; i++) {
1236                 struct net_device *dev;
1237
1238                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1239                                    NET_NAME_UNKNOWN, baycom_epp_dev_setup);
1240
1241                 if (!dev) {
1242                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1243                         return found ? 0 : -ENOMEM;
1244                 }
1245
1246                 sprintf(dev->name, "bce%d", i);
1247                 dev->base_addr = iobase[i];
1248
1249                 if (!mode[i])
1250                         set_hw = 0;
1251                 if (!set_hw)
1252                         iobase[i] = 0;
1253
1254                 if (register_netdev(dev)) {
1255                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1256                         free_netdev(dev);
1257                         break;
1258                 }
1259                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1260                         set_hw = 0;
1261                 baycom_device[i] = dev;
1262                 found++;
1263         }
1264
1265         if (found == 0) {
1266                 parport_unregister_driver(&baycom_epp_par_driver);
1267                 return -ENXIO;
1268         }
1269
1270         return 0;
1271 }
1272
1273 static void __exit cleanup_baycomepp(void)
1274 {
1275         int i;
1276
1277         for(i = 0; i < NR_PORTS; i++) {
1278                 struct net_device *dev = baycom_device[i];
1279
1280                 if (dev) {
1281                         struct baycom_state *bc = netdev_priv(dev);
1282                         if (bc->magic == BAYCOM_MAGIC) {
1283                                 unregister_netdev(dev);
1284                                 free_netdev(dev);
1285                         } else
1286                                 printk(paranoia_str, "cleanup_module");
1287                 }
1288         }
1289         parport_unregister_driver(&baycom_epp_par_driver);
1290 }
1291
1292 module_init(init_baycomepp);
1293 module_exit(cleanup_baycomepp);
1294
1295 /* --------------------------------------------------------------------- */
1296
1297 #ifndef MODULE
1298
1299 /*
1300  * format: baycom_epp=io,mode
1301  * mode: fpga config options
1302  */
1303
1304 static int __init baycom_epp_setup(char *str)
1305 {
1306         static unsigned __initdata nr_dev = 0;
1307         int ints[2];
1308
1309         if (nr_dev >= NR_PORTS)
1310                 return 0;
1311         str = get_options(str, 2, ints);
1312         if (ints[0] < 1)
1313                 return 0;
1314         mode[nr_dev] = str;
1315         iobase[nr_dev] = ints[1];
1316         nr_dev++;
1317         return 1;
1318 }
1319
1320 __setup("baycom_epp=", baycom_epp_setup);
1321
1322 #endif /* MODULE */
1323 /* --------------------------------------------------------------------- */