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 
504 		default:  /* fall through */
505 			if (bc->hdlctx.calibrate <= 0)
506 				return 0;
507 			i = min_t(int, cnt, bc->hdlctx.calibrate);
508 			cnt -= i;
509 			bc->hdlctx.calibrate -= i;
510 			memset(tmp, 0, sizeof(tmp));
511 			while (i > 0) {
512 				j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
513 				if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
514 					return -1;
515 				i -= j;
516 			}
517 			break;
518 		}
519 	}
520 	return 0;
521 }
522 
523 /* ---------------------------------------------------------------------- */
524 
525 static void do_rxpacket(struct net_device *dev)
526 {
527 	struct baycom_state *bc = netdev_priv(dev);
528 	struct sk_buff *skb;
529 	unsigned char *cp;
530 	unsigned pktlen;
531 
532 	if (bc->hdlcrx.bufcnt < 4)
533 		return;
534 	if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
535 		return;
536 	pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
537 	if (!(skb = dev_alloc_skb(pktlen))) {
538 		printk("%s: memory squeeze, dropping packet\n", dev->name);
539 		dev->stats.rx_dropped++;
540 		return;
541 	}
542 	cp = skb_put(skb, pktlen);
543 	*cp++ = 0; /* KISS kludge */
544 	memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
545 	skb->protocol = ax25_type_trans(skb, dev);
546 	netif_rx(skb);
547 	dev->stats.rx_packets++;
548 }
549 
550 static int receive(struct net_device *dev, int cnt)
551 {
552 	struct baycom_state *bc = netdev_priv(dev);
553 	struct parport *pp = bc->pdev->port;
554         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
555 	unsigned char tmp[128];
556         unsigned char *cp;
557 	int cnt2, ret = 0;
558 	int j;
559 
560         numbits = bc->hdlcrx.numbits;
561 	state = bc->hdlcrx.state;
562 	bitstream = bc->hdlcrx.bitstream;
563 	bitbuf = bc->hdlcrx.bitbuf;
564 	while (cnt > 0) {
565 		cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
566 		cnt -= cnt2;
567 		if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
568 			ret = -1;
569 			break;
570 		}
571 		cp = tmp;
572 		for (; cnt2 > 0; cnt2--, cp++) {
573 			bitstream >>= 8;
574 			bitstream |= (*cp) << 8;
575 			bitbuf >>= 8;
576 			bitbuf |= (*cp) << 8;
577 			numbits += 8;
578 			notbitstream = ~bitstream;
579 			for (j = 0; j < 8; j++) {
580 
581 				/* flag or abort */
582 			        if (unlikely(!(notbitstream & (0x0fc << j)))) {
583 
584 					/* abort received */
585 					if (!(notbitstream & (0x1fc << j)))
586 						state = 0;
587 
588 					/* flag received */
589 					else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) {
590 						if (state)
591 							do_rxpacket(dev);
592 						bc->hdlcrx.bufcnt = 0;
593 						bc->hdlcrx.bufptr = bc->hdlcrx.buf;
594 						state = 1;
595 						numbits = 7-j;
596 					}
597 				}
598 
599 				/* stuffed bit */
600 				else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
601 					numbits--;
602 					bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
603 					}
604 				}
605 			while (state && numbits >= 8) {
606 				if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
607 					state = 0;
608 				} else {
609 					*(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
610 					bc->hdlcrx.bufcnt++;
611 					numbits -= 8;
612 				}
613 			}
614 		}
615 	}
616         bc->hdlcrx.numbits = numbits;
617 	bc->hdlcrx.state = state;
618 	bc->hdlcrx.bitstream = bitstream;
619 	bc->hdlcrx.bitbuf = bitbuf;
620 	return ret;
621 }
622 
623 /* --------------------------------------------------------------------- */
624 
625 #ifdef __i386__
626 #include <asm/msr.h>
627 #define GETTICK(x)						\
628 ({								\
629 	if (boot_cpu_has(X86_FEATURE_TSC))			\
630 		x = (unsigned int)rdtsc();			\
631 })
632 #else /* __i386__ */
633 #define GETTICK(x)
634 #endif /* __i386__ */
635 
636 static void epp_bh(struct work_struct *work)
637 {
638 	struct net_device *dev;
639 	struct baycom_state *bc;
640 	struct parport *pp;
641 	unsigned char stat;
642 	unsigned char tmp[2];
643 	unsigned int time1 = 0, time2 = 0, time3 = 0;
644 	int cnt, cnt2;
645 
646 	bc = container_of(work, struct baycom_state, run_work.work);
647 	dev = bc->dev;
648 	if (!bc->work_running)
649 		return;
650 	baycom_int_freq(bc);
651 	pp = bc->pdev->port;
652 	/* update status */
653 	if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
654 		goto epptimeout;
655 	bc->stat = stat;
656 	bc->debug_vals.last_pllcorr = stat;
657 	GETTICK(time1);
658 	if (bc->modem == EPP_FPGAEXTSTATUS) {
659 		/* get input count */
660 		tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
661 		if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
662 			goto epptimeout;
663 		if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
664 			goto epptimeout;
665 		cnt = tmp[0] | (tmp[1] << 8);
666 		cnt &= 0x7fff;
667 		/* get output count */
668 		tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
669 		if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
670 			goto epptimeout;
671 		if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
672 			goto epptimeout;
673 		cnt2 = tmp[0] | (tmp[1] << 8);
674 		cnt2 = 16384 - (cnt2 & 0x7fff);
675 		/* return to normal */
676 		tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
677 		if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
678 			goto epptimeout;
679 		if (transmit(bc, cnt2, stat))
680 			goto epptimeout;
681 		GETTICK(time2);
682 		if (receive(dev, cnt))
683 			goto epptimeout;
684 		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
685 			goto epptimeout;
686 		bc->stat = stat;
687 	} else {
688 		/* try to tx */
689 		switch (stat & (EPP_NTAEF|EPP_NTHF)) {
690 		case EPP_NTHF:
691 			cnt = 2048 - 256;
692 			break;
693 
694 		case EPP_NTAEF:
695 			cnt = 2048 - 1793;
696 			break;
697 
698 		case 0:
699 			cnt = 0;
700 			break;
701 
702 		default:
703 			cnt = 2048 - 1025;
704 			break;
705 		}
706 		if (transmit(bc, cnt, stat))
707 			goto epptimeout;
708 		GETTICK(time2);
709 		/* do receiver */
710 		while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
711 			switch (stat & (EPP_NRAEF|EPP_NRHF)) {
712 			case EPP_NRAEF:
713 				cnt = 1025;
714 				break;
715 
716 			case 0:
717 				cnt = 1793;
718 				break;
719 
720 			default:
721 				cnt = 256;
722 				break;
723 			}
724 			if (receive(dev, cnt))
725 				goto epptimeout;
726 			if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
727 				goto epptimeout;
728 		}
729 		cnt = 0;
730 		if (bc->bitrate < 50000)
731 			cnt = 256;
732 		else if (bc->bitrate < 100000)
733 			cnt = 128;
734 		while (cnt > 0 && stat & EPP_NREF) {
735 			if (receive(dev, 1))
736 				goto epptimeout;
737 			cnt--;
738 			if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
739 				goto epptimeout;
740 		}
741 	}
742 	GETTICK(time3);
743 #ifdef BAYCOM_DEBUG
744 	bc->debug_vals.mod_cycles = time2 - time1;
745 	bc->debug_vals.demod_cycles = time3 - time2;
746 #endif /* BAYCOM_DEBUG */
747 	schedule_delayed_work(&bc->run_work, 1);
748 	if (!bc->skb)
749 		netif_wake_queue(dev);
750 	return;
751  epptimeout:
752 	printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
753 }
754 
755 /* ---------------------------------------------------------------------- */
756 /*
757  * ===================== network driver interface =========================
758  */
759 
760 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
761 {
762 	struct baycom_state *bc = netdev_priv(dev);
763 
764 	if (skb->protocol == htons(ETH_P_IP))
765 		return ax25_ip_xmit(skb);
766 
767 	if (skb->data[0] != 0) {
768 		do_kiss_params(bc, skb->data, skb->len);
769 		dev_kfree_skb(skb);
770 		return NETDEV_TX_OK;
771 	}
772 	if (bc->skb) {
773 		dev_kfree_skb(skb);
774 		return NETDEV_TX_OK;
775 	}
776 	/* strip KISS byte */
777 	if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
778 		dev_kfree_skb(skb);
779 		return NETDEV_TX_OK;
780 	}
781 	netif_stop_queue(dev);
782 	bc->skb = skb;
783 	return NETDEV_TX_OK;
784 }
785 
786 /* --------------------------------------------------------------------- */
787 
788 static int baycom_set_mac_address(struct net_device *dev, void *addr)
789 {
790 	struct sockaddr *sa = (struct sockaddr *)addr;
791 
792 	/* addr is an AX.25 shifted ASCII mac address */
793 	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
794 	return 0;
795 }
796 
797 /* --------------------------------------------------------------------- */
798 
799 static void epp_wakeup(void *handle)
800 {
801         struct net_device *dev = (struct net_device *)handle;
802         struct baycom_state *bc = netdev_priv(dev);
803 
804         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
805         if (!parport_claim(bc->pdev))
806                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
807 }
808 
809 /* --------------------------------------------------------------------- */
810 
811 /*
812  * Open/initialize the board. This is called (in the current kernel)
813  * sometime after booting when the 'ifconfig' program is run.
814  *
815  * This routine should set everything up anew at each open, even
816  * registers that "should" only need to be set once at boot, so that
817  * there is non-reboot way to recover if something goes wrong.
818  */
819 
820 static int epp_open(struct net_device *dev)
821 {
822 	struct baycom_state *bc = netdev_priv(dev);
823         struct parport *pp = parport_find_base(dev->base_addr);
824 	unsigned int i, j;
825 	unsigned char tmp[128];
826 	unsigned char stat;
827 	unsigned long tstart;
828 	struct pardev_cb par_cb;
829 
830         if (!pp) {
831                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
832                 return -ENXIO;
833         }
834 #if 0
835         if (pp->irq < 0) {
836                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
837 		parport_put_port(pp);
838                 return -ENXIO;
839         }
840 #endif
841 	if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
842                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
843 		       bc_drvname, pp->base);
844 		parport_put_port(pp);
845                 return -EIO;
846 	}
847 	memset(&bc->modem, 0, sizeof(bc->modem));
848 	memset(&par_cb, 0, sizeof(par_cb));
849 	par_cb.wakeup = epp_wakeup;
850 	par_cb.private = (void *)dev;
851 	par_cb.flags = PARPORT_DEV_EXCL;
852 	for (i = 0; i < NR_PORTS; i++)
853 		if (baycom_device[i] == dev)
854 			break;
855 
856 	if (i == NR_PORTS) {
857 		pr_err("%s: no device found\n", bc_drvname);
858 		parport_put_port(pp);
859 		return -ENODEV;
860 	}
861 
862 	bc->pdev = parport_register_dev_model(pp, dev->name, &par_cb, i);
863 	parport_put_port(pp);
864         if (!bc->pdev) {
865                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
866                 return -ENXIO;
867         }
868         if (parport_claim(bc->pdev)) {
869                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
870                 parport_unregister_device(bc->pdev);
871                 return -EBUSY;
872         }
873         dev->irq = /*pp->irq*/ 0;
874 	INIT_DELAYED_WORK(&bc->run_work, epp_bh);
875 	bc->work_running = 1;
876 	bc->modem = EPP_CONVENTIONAL;
877 	if (eppconfig(bc))
878 		printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
879 	else
880 		bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
881 	parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
882 	/* reset the modem */
883 	tmp[0] = 0;
884 	tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
885 	if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
886 		goto epptimeout;
887 	/* autoprobe baud rate */
888 	tstart = jiffies;
889 	i = 0;
890 	while (time_before(jiffies, tstart + HZ/3)) {
891 		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
892 			goto epptimeout;
893 		if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
894 			schedule();
895 			continue;
896 		}
897 		if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
898 			goto epptimeout;
899 		if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
900 			goto epptimeout;
901 		i += 256;
902 	}
903 	for (j = 0; j < 256; j++) {
904 		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
905 			goto epptimeout;
906 		if (!(stat & EPP_NREF))
907 			break;
908 		if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
909 			goto epptimeout;
910 		i++;
911 	}
912 	tstart = jiffies - tstart;
913 	bc->bitrate = i * (8 * HZ) / tstart;
914 	j = 1;
915 	i = bc->bitrate >> 3;
916 	while (j < 7 && i > 150) {
917 		j++;
918 		i >>= 1;
919 	}
920 	printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
921 	       bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
922 	tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
923 	if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
924 		goto epptimeout;
925 	/*
926 	 * initialise hdlc variables
927 	 */
928 	bc->hdlcrx.state = 0;
929 	bc->hdlcrx.numbits = 0;
930 	bc->hdlctx.state = tx_idle;
931 	bc->hdlctx.bufcnt = 0;
932 	bc->hdlctx.slotcnt = bc->ch_params.slottime;
933 	bc->hdlctx.calibrate = 0;
934 	/* start the bottom half stuff */
935 	schedule_delayed_work(&bc->run_work, 1);
936 	netif_start_queue(dev);
937 	return 0;
938 
939  epptimeout:
940 	printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
941 	parport_write_control(pp, 0); /* reset the adapter */
942         parport_release(bc->pdev);
943         parport_unregister_device(bc->pdev);
944 	return -EIO;
945 }
946 
947 /* --------------------------------------------------------------------- */
948 
949 static int epp_close(struct net_device *dev)
950 {
951 	struct baycom_state *bc = netdev_priv(dev);
952 	struct parport *pp = bc->pdev->port;
953 	unsigned char tmp[1];
954 
955 	bc->work_running = 0;
956 	cancel_delayed_work_sync(&bc->run_work);
957 	bc->stat = EPP_DCDBIT;
958 	tmp[0] = 0;
959 	pp->ops->epp_write_addr(pp, tmp, 1, 0);
960 	parport_write_control(pp, 0); /* reset the adapter */
961         parport_release(bc->pdev);
962         parport_unregister_device(bc->pdev);
963 	if (bc->skb)
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 /* --------------------------------------------------------------------- */
1324