linux/drivers/net/hamradio/baycom_epp.c
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   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
  52static const char paranoia_str[] = KERN_ERR 
  53        "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
  54
  55static const char bc_drvname[] = "baycom_epp";
  56static 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
  63static 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
 154struct 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
 232static 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
 246static 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
 253static 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
 264static 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
 287static char const eppconfig_path[] = "/usr/sbin/eppfpga";
 288
 289static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
 290
 291/* eppconfig: called during ifconfig up to configure the modem */
 292static 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
 317static 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
 358static 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
 420static 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                        /* fall through */
 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
 526static 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
 551static 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
 637static 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
 761static 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
 789static 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
 800static 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
 821static 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
 950static 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
 973static 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
1008static 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
1114static 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 */
1129static 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 */
1173static char *mode[NR_PORTS] = { "", };
1174static int iobase[NR_PORTS] = { 0x378, };
1175
1176module_param_array(mode, charp, NULL, 0);
1177MODULE_PARM_DESC(mode, "baycom operating mode");
1178module_param_hw_array(iobase, int, ioport, NULL, 0);
1179MODULE_PARM_DESC(iobase, "baycom io base address");
1180
1181MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1182MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1183MODULE_LICENSE("GPL");
1184
1185/* --------------------------------------------------------------------- */
1186
1187static 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
1198static struct parport_driver baycom_epp_par_driver = {
1199        .name = "bce",
1200        .probe = baycom_epp_par_probe,
1201        .devmodel = true,
1202};
1203
1204static 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
1221static 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
1273static 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
1292module_init(init_baycomepp);
1293module_exit(cleanup_baycomepp);
1294
1295/* --------------------------------------------------------------------- */
1296
1297#ifndef MODULE
1298
1299/*
1300 * format: baycom_epp=io,mode
1301 * mode: fpga config options
1302 */
1303
1304static 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/* --------------------------------------------------------------------- */
1324