xref: /linux/drivers/net/hamradio/baycom_epp.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /*****************************************************************************/
2 
3 /*
4  *	baycom_epp.c  -- baycom epp radio modem driver.
5  *
6  *	Copyright (C) 1998-2000
7  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
8  *
9  *	This program is free software; you can redistribute it and/or modify
10  *	it under the terms of the GNU General Public License as published by
11  *	the Free Software Foundation; either version 2 of the License, or
12  *	(at your option) any later version.
13  *
14  *	This program is distributed in the hope that it will be useful,
15  *	but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *	GNU General Public License for more details.
18  *
19  *	You should have received a copy of the GNU General Public License
20  *	along with this program; if not, write to the Free Software
21  *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  *
23  *  Please note that the GPL allows you to use the driver, NOT the radio.
24  *  In order to use the radio, you need a license from the communications
25  *  authority of your country.
26  *
27  *
28  *  History:
29  *   0.1  xx.xx.1998  Initial version by Matthias Welwarsky (dg2fef)
30  *   0.2  21.04.1998  Massive rework by Thomas Sailer
31  *                    Integrated FPGA EPP modem configuration routines
32  *   0.3  11.05.1998  Took FPGA config out and moved it into a separate program
33  *   0.4  26.07.1999  Adapted to new lowlevel parport driver interface
34  *   0.5  03.08.1999  adapt to Linus' new __setup/__initcall
35  *                    removed some pre-2.2 kernel compatibility cruft
36  *   0.6  10.08.1999  Check if parport can do SPP and is safe to access during interrupt contexts
37  *   0.7  12.02.2000  adapted to softnet driver interface
38  *
39  */
40 
41 /*****************************************************************************/
42 
43 #include <linux/crc-ccitt.h>
44 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/init.h>
47 #include <linux/sched.h>
48 #include <linux/string.h>
49 #include <linux/workqueue.h>
50 #include <linux/fs.h>
51 #include <linux/parport.h>
52 #include <linux/if_arp.h>
53 #include <linux/hdlcdrv.h>
54 #include <linux/baycom.h>
55 #include <linux/jiffies.h>
56 #include <linux/random.h>
57 #include <net/ax25.h>
58 #include <asm/uaccess.h>
59 
60 /* --------------------------------------------------------------------- */
61 
62 #define BAYCOM_DEBUG
63 #define BAYCOM_MAGIC 19730510
64 
65 /* --------------------------------------------------------------------- */
66 
67 static const char paranoia_str[] = KERN_ERR
68 	"baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
69 
70 static const char bc_drvname[] = "baycom_epp";
71 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
72 "baycom_epp: version 0.7\n";
73 
74 /* --------------------------------------------------------------------- */
75 
76 #define NR_PORTS 4
77 
78 static struct net_device *baycom_device[NR_PORTS];
79 
80 /* --------------------------------------------------------------------- */
81 
82 /* EPP status register */
83 #define EPP_DCDBIT      0x80
84 #define EPP_PTTBIT      0x08
85 #define EPP_NREF        0x01
86 #define EPP_NRAEF       0x02
87 #define EPP_NRHF        0x04
88 #define EPP_NTHF        0x20
89 #define EPP_NTAEF       0x10
90 #define EPP_NTEF        EPP_PTTBIT
91 
92 /* EPP control register */
93 #define EPP_TX_FIFO_ENABLE 0x10
94 #define EPP_RX_FIFO_ENABLE 0x08
95 #define EPP_MODEM_ENABLE   0x20
96 #define EPP_LEDS           0xC0
97 #define EPP_IRQ_ENABLE     0x10
98 
99 /* LPT registers */
100 #define LPTREG_ECONTROL       0x402
101 #define LPTREG_CONFIGB        0x401
102 #define LPTREG_CONFIGA        0x400
103 #define LPTREG_EPPDATA        0x004
104 #define LPTREG_EPPADDR        0x003
105 #define LPTREG_CONTROL        0x002
106 #define LPTREG_STATUS         0x001
107 #define LPTREG_DATA           0x000
108 
109 /* LPT control register */
110 #define LPTCTRL_PROGRAM       0x04   /* 0 to reprogram */
111 #define LPTCTRL_WRITE         0x01
112 #define LPTCTRL_ADDRSTB       0x08
113 #define LPTCTRL_DATASTB       0x02
114 #define LPTCTRL_INTEN         0x10
115 
116 /* LPT status register */
117 #define LPTSTAT_SHIFT_NINTR   6
118 #define LPTSTAT_WAIT          0x80
119 #define LPTSTAT_NINTR         (1<<LPTSTAT_SHIFT_NINTR)
120 #define LPTSTAT_PE            0x20
121 #define LPTSTAT_DONE          0x10
122 #define LPTSTAT_NERROR        0x08
123 #define LPTSTAT_EPPTIMEOUT    0x01
124 
125 /* LPT data register */
126 #define LPTDATA_SHIFT_TDI     0
127 #define LPTDATA_SHIFT_TMS     2
128 #define LPTDATA_TDI           (1<<LPTDATA_SHIFT_TDI)
129 #define LPTDATA_TCK           0x02
130 #define LPTDATA_TMS           (1<<LPTDATA_SHIFT_TMS)
131 #define LPTDATA_INITBIAS      0x80
132 
133 
134 /* EPP modem config/status bits */
135 #define EPP_DCDBIT            0x80
136 #define EPP_PTTBIT            0x08
137 #define EPP_RXEBIT            0x01
138 #define EPP_RXAEBIT           0x02
139 #define EPP_RXHFULL           0x04
140 
141 #define EPP_NTHF              0x20
142 #define EPP_NTAEF             0x10
143 #define EPP_NTEF              EPP_PTTBIT
144 
145 #define EPP_TX_FIFO_ENABLE    0x10
146 #define EPP_RX_FIFO_ENABLE    0x08
147 #define EPP_MODEM_ENABLE      0x20
148 #define EPP_LEDS              0xC0
149 #define EPP_IRQ_ENABLE        0x10
150 
151 /* Xilinx 4k JTAG instructions */
152 #define XC4K_IRLENGTH   3
153 #define XC4K_EXTEST     0
154 #define XC4K_PRELOAD    1
155 #define XC4K_CONFIGURE  5
156 #define XC4K_BYPASS     7
157 
158 #define EPP_CONVENTIONAL  0
159 #define EPP_FPGA          1
160 #define EPP_FPGAEXTSTATUS 2
161 
162 #define TXBUFFER_SIZE     ((HDLCDRV_MAXFLEN*6/5)+8)
163 
164 /* ---------------------------------------------------------------------- */
165 /*
166  * Information that need to be kept for each board.
167  */
168 
169 struct baycom_state {
170 	int magic;
171 
172         struct pardevice *pdev;
173 	struct net_device *dev;
174 	unsigned int work_running;
175 	struct delayed_work run_work;
176 	unsigned int modem;
177 	unsigned int bitrate;
178 	unsigned char stat;
179 
180 	struct {
181 		unsigned int intclk;
182 		unsigned int fclk;
183 		unsigned int bps;
184 		unsigned int extmodem;
185 		unsigned int loopback;
186 	} cfg;
187 
188         struct hdlcdrv_channel_params ch_params;
189 
190         struct {
191 		unsigned int bitbuf, bitstream, numbits, state;
192 		unsigned char *bufptr;
193 		int bufcnt;
194 		unsigned char buf[TXBUFFER_SIZE];
195         } hdlcrx;
196 
197         struct {
198 		int calibrate;
199                 int slotcnt;
200 		int flags;
201 		enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
202 		unsigned char *bufptr;
203 		int bufcnt;
204 		unsigned char buf[TXBUFFER_SIZE];
205         } hdlctx;
206 
207 	unsigned int ptt_keyed;
208 	struct sk_buff *skb;  /* next transmit packet  */
209 
210 #ifdef BAYCOM_DEBUG
211 	struct debug_vals {
212 		unsigned long last_jiffies;
213 		unsigned cur_intcnt;
214 		unsigned last_intcnt;
215 		int cur_pllcorr;
216 		int last_pllcorr;
217 		unsigned int mod_cycles;
218 		unsigned int demod_cycles;
219 	} debug_vals;
220 #endif /* BAYCOM_DEBUG */
221 };
222 
223 /* --------------------------------------------------------------------- */
224 
225 #define KISS_VERBOSE
226 
227 /* --------------------------------------------------------------------- */
228 
229 #define PARAM_TXDELAY   1
230 #define PARAM_PERSIST   2
231 #define PARAM_SLOTTIME  3
232 #define PARAM_TXTAIL    4
233 #define PARAM_FULLDUP   5
234 #define PARAM_HARDWARE  6
235 #define PARAM_RETURN    255
236 
237 /* --------------------------------------------------------------------- */
238 /*
239  * the CRC routines are stolen from WAMPES
240  * by Dieter Deyke
241  */
242 
243 
244 /*---------------------------------------------------------------------------*/
245 
246 #if 0
247 static inline void append_crc_ccitt(unsigned char *buffer, int len)
248 {
249  	unsigned int crc = 0xffff;
250 
251 	for (;len>0;len--)
252 		crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ *buffer++) & 0xff];
253 	crc ^= 0xffff;
254 	*buffer++ = crc;
255 	*buffer++ = crc >> 8;
256 }
257 #endif
258 
259 /*---------------------------------------------------------------------------*/
260 
261 static inline int check_crc_ccitt(const unsigned char *buf, int cnt)
262 {
263 	return (crc_ccitt(0xffff, buf, cnt) & 0xffff) == 0xf0b8;
264 }
265 
266 /*---------------------------------------------------------------------------*/
267 
268 static inline int calc_crc_ccitt(const unsigned char *buf, int cnt)
269 {
270 	return (crc_ccitt(0xffff, buf, cnt) ^ 0xffff) & 0xffff;
271 }
272 
273 /* ---------------------------------------------------------------------- */
274 
275 #define tenms_to_flags(bc,tenms) ((tenms * bc->bitrate) / 800)
276 
277 /* --------------------------------------------------------------------- */
278 
279 static inline void baycom_int_freq(struct baycom_state *bc)
280 {
281 #ifdef BAYCOM_DEBUG
282 	unsigned long cur_jiffies = jiffies;
283 	/*
284 	 * measure the interrupt frequency
285 	 */
286 	bc->debug_vals.cur_intcnt++;
287 	if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
288 		bc->debug_vals.last_jiffies = cur_jiffies;
289 		bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
290 		bc->debug_vals.cur_intcnt = 0;
291 		bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
292 		bc->debug_vals.cur_pllcorr = 0;
293 	}
294 #endif /* BAYCOM_DEBUG */
295 }
296 
297 /* ---------------------------------------------------------------------- */
298 /*
299  *    eppconfig_path should be setable  via /proc/sys.
300  */
301 
302 static char eppconfig_path[256] = "/usr/sbin/eppfpga";
303 
304 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/usr/bin:/bin", NULL };
305 
306 /* eppconfig: called during ifconfig up to configure the modem */
307 static int eppconfig(struct baycom_state *bc)
308 {
309 	char modearg[256];
310 	char portarg[16];
311         char *argv[] = { eppconfig_path, "-s", "-p", portarg, "-m", modearg,
312 			 NULL };
313 
314 	/* set up arguments */
315 	sprintf(modearg, "%sclk,%smodem,fclk=%d,bps=%d,divider=%d%s,extstat",
316 		bc->cfg.intclk ? "int" : "ext",
317 		bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
318 		(bc->cfg.fclk + 8 * bc->cfg.bps) / (16 * bc->cfg.bps),
319 		bc->cfg.loopback ? ",loopback" : "");
320 	sprintf(portarg, "%ld", bc->pdev->port->base);
321 	printk(KERN_DEBUG "%s: %s -s -p %s -m %s\n", bc_drvname, eppconfig_path, portarg, modearg);
322 
323 	return call_usermodehelper(eppconfig_path, argv, envp, UMH_WAIT_PROC);
324 }
325 
326 /* ---------------------------------------------------------------------- */
327 
328 static inline void do_kiss_params(struct baycom_state *bc,
329 				  unsigned char *data, unsigned long len)
330 {
331 
332 #ifdef KISS_VERBOSE
333 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
334 #else /* KISS_VERBOSE */
335 #define PKP(a,b)
336 #endif /* KISS_VERBOSE */
337 
338 	if (len < 2)
339 		return;
340 	switch(data[0]) {
341 	case PARAM_TXDELAY:
342 		bc->ch_params.tx_delay = data[1];
343 		PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
344 		break;
345 	case PARAM_PERSIST:
346 		bc->ch_params.ppersist = data[1];
347 		PKP("p persistence = %u", bc->ch_params.ppersist);
348 		break;
349 	case PARAM_SLOTTIME:
350 		bc->ch_params.slottime = data[1];
351 		PKP("slot time = %ums", bc->ch_params.slottime);
352 		break;
353 	case PARAM_TXTAIL:
354 		bc->ch_params.tx_tail = data[1];
355 		PKP("TX tail = %ums", bc->ch_params.tx_tail);
356 		break;
357 	case PARAM_FULLDUP:
358 		bc->ch_params.fulldup = !!data[1];
359 		PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
360 		break;
361 	default:
362 		break;
363 	}
364 #undef PKP
365 }
366 
367 /* --------------------------------------------------------------------- */
368 
369 static void encode_hdlc(struct baycom_state *bc)
370 {
371 	struct sk_buff *skb;
372 	unsigned char *wp, *bp;
373 	int pkt_len;
374         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
375 	unsigned char crcarr[2];
376 	int j;
377 
378 	if (bc->hdlctx.bufcnt > 0)
379 		return;
380 	skb = bc->skb;
381 	if (!skb)
382 		return;
383 	bc->skb = NULL;
384 	pkt_len = skb->len-1; /* strip KISS byte */
385 	wp = bc->hdlctx.buf;
386 	bp = skb->data+1;
387 	crc = calc_crc_ccitt(bp, pkt_len);
388 	crcarr[0] = crc;
389 	crcarr[1] = crc >> 8;
390 	*wp++ = 0x7e;
391 	bitstream = bitbuf = numbit = 0;
392 	while (pkt_len > -2) {
393 		bitstream >>= 8;
394 		bitstream |= ((unsigned int)*bp) << 8;
395 		bitbuf |= ((unsigned int)*bp) << numbit;
396 		notbitstream = ~bitstream;
397 		bp++;
398 		pkt_len--;
399 		if (!pkt_len)
400 			bp = crcarr;
401 		for (j = 0; j < 8; j++)
402 			if (unlikely(!(notbitstream & (0x1f0 << j)))) {
403 				bitstream &= ~(0x100 << j);
404  				bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
405 					((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
406 				numbit++;
407 				notbitstream = ~bitstream;
408 			}
409 		numbit += 8;
410 		while (numbit >= 8) {
411 			*wp++ = bitbuf;
412 			bitbuf >>= 8;
413 			numbit -= 8;
414 		}
415 	}
416 	bitbuf |= 0x7e7e << numbit;
417 	numbit += 16;
418 	while (numbit >= 8) {
419 		*wp++ = bitbuf;
420 		bitbuf >>= 8;
421 		numbit -= 8;
422 	}
423 	bc->hdlctx.bufptr = bc->hdlctx.buf;
424 	bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
425 	dev_kfree_skb(skb);
426 	bc->dev->stats.tx_packets++;
427 }
428 
429 /* ---------------------------------------------------------------------- */
430 
431 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
432 {
433 	struct parport *pp = bc->pdev->port;
434 	unsigned char tmp[128];
435 	int i, j;
436 
437 	if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
438 		bc->hdlctx.state = tx_idle;
439 	if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
440 		if (bc->hdlctx.bufcnt <= 0)
441 			encode_hdlc(bc);
442 		if (bc->hdlctx.bufcnt <= 0)
443 			return 0;
444 		if (!bc->ch_params.fulldup) {
445 			if (!(stat & EPP_DCDBIT)) {
446 				bc->hdlctx.slotcnt = bc->ch_params.slottime;
447 				return 0;
448 			}
449 			if ((--bc->hdlctx.slotcnt) > 0)
450 				return 0;
451 			bc->hdlctx.slotcnt = bc->ch_params.slottime;
452 			if ((random32() % 256) > bc->ch_params.ppersist)
453 				return 0;
454 		}
455 	}
456 	if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
457 		bc->hdlctx.state = tx_keyup;
458 		bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
459 		bc->ptt_keyed++;
460 	}
461 	while (cnt > 0) {
462 		switch (bc->hdlctx.state) {
463 		case tx_keyup:
464 			i = min_t(int, cnt, bc->hdlctx.flags);
465 			cnt -= i;
466 			bc->hdlctx.flags -= i;
467 			if (bc->hdlctx.flags <= 0)
468 				bc->hdlctx.state = tx_data;
469 			memset(tmp, 0x7e, sizeof(tmp));
470 			while (i > 0) {
471 				j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
472 				if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
473 					return -1;
474 				i -= j;
475 			}
476 			break;
477 
478 		case tx_data:
479 			if (bc->hdlctx.bufcnt <= 0) {
480 				encode_hdlc(bc);
481 				if (bc->hdlctx.bufcnt <= 0) {
482 					bc->hdlctx.state = tx_tail;
483 					bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
484 					break;
485 				}
486 			}
487 			i = min_t(int, cnt, bc->hdlctx.bufcnt);
488 			bc->hdlctx.bufcnt -= i;
489 			cnt -= i;
490 			if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
491 					return -1;
492 			bc->hdlctx.bufptr += i;
493 			break;
494 
495 		case tx_tail:
496 			encode_hdlc(bc);
497 			if (bc->hdlctx.bufcnt > 0) {
498 				bc->hdlctx.state = tx_data;
499 				break;
500 			}
501 			i = min_t(int, cnt, bc->hdlctx.flags);
502 			if (i) {
503 				cnt -= i;
504 				bc->hdlctx.flags -= i;
505 				memset(tmp, 0x7e, sizeof(tmp));
506 				while (i > 0) {
507 					j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
508 					if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
509 						return -1;
510 					i -= j;
511 				}
512 				break;
513 			}
514 
515 		default:  /* fall through */
516 			if (bc->hdlctx.calibrate <= 0)
517 				return 0;
518 			i = min_t(int, cnt, bc->hdlctx.calibrate);
519 			cnt -= i;
520 			bc->hdlctx.calibrate -= i;
521 			memset(tmp, 0, sizeof(tmp));
522 			while (i > 0) {
523 				j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
524 				if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
525 					return -1;
526 				i -= j;
527 			}
528 			break;
529 		}
530 	}
531 	return 0;
532 }
533 
534 /* ---------------------------------------------------------------------- */
535 
536 static void do_rxpacket(struct net_device *dev)
537 {
538 	struct baycom_state *bc = netdev_priv(dev);
539 	struct sk_buff *skb;
540 	unsigned char *cp;
541 	unsigned pktlen;
542 
543 	if (bc->hdlcrx.bufcnt < 4)
544 		return;
545 	if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
546 		return;
547 	pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
548 	if (!(skb = dev_alloc_skb(pktlen))) {
549 		printk("%s: memory squeeze, dropping packet\n", dev->name);
550 		dev->stats.rx_dropped++;
551 		return;
552 	}
553 	cp = skb_put(skb, pktlen);
554 	*cp++ = 0; /* KISS kludge */
555 	memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
556 	skb->protocol = ax25_type_trans(skb, dev);
557 	netif_rx(skb);
558 	dev->stats.rx_packets++;
559 }
560 
561 static int receive(struct net_device *dev, int cnt)
562 {
563 	struct baycom_state *bc = netdev_priv(dev);
564 	struct parport *pp = bc->pdev->port;
565         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
566 	unsigned char tmp[128];
567         unsigned char *cp;
568 	int cnt2, ret = 0;
569 	int j;
570 
571         numbits = bc->hdlcrx.numbits;
572 	state = bc->hdlcrx.state;
573 	bitstream = bc->hdlcrx.bitstream;
574 	bitbuf = bc->hdlcrx.bitbuf;
575 	while (cnt > 0) {
576 		cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
577 		cnt -= cnt2;
578 		if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
579 			ret = -1;
580 			break;
581 		}
582 		cp = tmp;
583 		for (; cnt2 > 0; cnt2--, cp++) {
584 			bitstream >>= 8;
585 			bitstream |= (*cp) << 8;
586 			bitbuf >>= 8;
587 			bitbuf |= (*cp) << 8;
588 			numbits += 8;
589 			notbitstream = ~bitstream;
590 			for (j = 0; j < 8; j++) {
591 
592 				/* flag or abort */
593 			        if (unlikely(!(notbitstream & (0x0fc << j)))) {
594 
595 					/* abort received */
596 					if (!(notbitstream & (0x1fc << j)))
597 						state = 0;
598 
599 					/* flag received */
600 					else if ((bitstream & (0x1fe << j)) == (0x0fc << j)) {
601 						if (state)
602 							do_rxpacket(dev);
603 						bc->hdlcrx.bufcnt = 0;
604 						bc->hdlcrx.bufptr = bc->hdlcrx.buf;
605 						state = 1;
606 						numbits = 7-j;
607 					}
608 				}
609 
610 				/* stuffed bit */
611 				else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
612 					numbits--;
613 					bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
614 					}
615 				}
616 			while (state && numbits >= 8) {
617 				if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
618 					state = 0;
619 				} else {
620 					*(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
621 					bc->hdlcrx.bufcnt++;
622 					numbits -= 8;
623 				}
624 			}
625 		}
626 	}
627         bc->hdlcrx.numbits = numbits;
628 	bc->hdlcrx.state = state;
629 	bc->hdlcrx.bitstream = bitstream;
630 	bc->hdlcrx.bitbuf = bitbuf;
631 	return ret;
632 }
633 
634 /* --------------------------------------------------------------------- */
635 
636 #ifdef __i386__
637 #include <asm/msr.h>
638 #define GETTICK(x)                                                \
639 ({                                                                \
640 	if (cpu_has_tsc)                                          \
641 		rdtscl(x);                                        \
642 })
643 #else /* __i386__ */
644 #define GETTICK(x)
645 #endif /* __i386__ */
646 
647 static void epp_bh(struct work_struct *work)
648 {
649 	struct net_device *dev;
650 	struct baycom_state *bc;
651 	struct parport *pp;
652 	unsigned char stat;
653 	unsigned char tmp[2];
654 	unsigned int time1 = 0, time2 = 0, time3 = 0;
655 	int cnt, cnt2;
656 
657 	bc = container_of(work, struct baycom_state, run_work.work);
658 	dev = bc->dev;
659 	if (!bc->work_running)
660 		return;
661 	baycom_int_freq(bc);
662 	pp = bc->pdev->port;
663 	/* update status */
664 	if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
665 		goto epptimeout;
666 	bc->stat = stat;
667 	bc->debug_vals.last_pllcorr = stat;
668 	GETTICK(time1);
669 	if (bc->modem == EPP_FPGAEXTSTATUS) {
670 		/* get input count */
671 		tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
672 		if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
673 			goto epptimeout;
674 		if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
675 			goto epptimeout;
676 		cnt = tmp[0] | (tmp[1] << 8);
677 		cnt &= 0x7fff;
678 		/* get output count */
679 		tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
680 		if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
681 			goto epptimeout;
682 		if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
683 			goto epptimeout;
684 		cnt2 = tmp[0] | (tmp[1] << 8);
685 		cnt2 = 16384 - (cnt2 & 0x7fff);
686 		/* return to normal */
687 		tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
688 		if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
689 			goto epptimeout;
690 		if (transmit(bc, cnt2, stat))
691 			goto epptimeout;
692 		GETTICK(time2);
693 		if (receive(dev, cnt))
694 			goto epptimeout;
695 		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
696 			goto epptimeout;
697 		bc->stat = stat;
698 	} else {
699 		/* try to tx */
700 		switch (stat & (EPP_NTAEF|EPP_NTHF)) {
701 		case EPP_NTHF:
702 			cnt = 2048 - 256;
703 			break;
704 
705 		case EPP_NTAEF:
706 			cnt = 2048 - 1793;
707 			break;
708 
709 		case 0:
710 			cnt = 0;
711 			break;
712 
713 		default:
714 			cnt = 2048 - 1025;
715 			break;
716 		}
717 		if (transmit(bc, cnt, stat))
718 			goto epptimeout;
719 		GETTICK(time2);
720 		/* do receiver */
721 		while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
722 			switch (stat & (EPP_NRAEF|EPP_NRHF)) {
723 			case EPP_NRAEF:
724 				cnt = 1025;
725 				break;
726 
727 			case 0:
728 				cnt = 1793;
729 				break;
730 
731 			default:
732 				cnt = 256;
733 				break;
734 			}
735 			if (receive(dev, cnt))
736 				goto epptimeout;
737 			if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
738 				goto epptimeout;
739 		}
740 		cnt = 0;
741 		if (bc->bitrate < 50000)
742 			cnt = 256;
743 		else if (bc->bitrate < 100000)
744 			cnt = 128;
745 		while (cnt > 0 && stat & EPP_NREF) {
746 			if (receive(dev, 1))
747 				goto epptimeout;
748 			cnt--;
749 			if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
750 				goto epptimeout;
751 		}
752 	}
753 	GETTICK(time3);
754 #ifdef BAYCOM_DEBUG
755 	bc->debug_vals.mod_cycles = time2 - time1;
756 	bc->debug_vals.demod_cycles = time3 - time2;
757 #endif /* BAYCOM_DEBUG */
758 	schedule_delayed_work(&bc->run_work, 1);
759 	if (!bc->skb)
760 		netif_wake_queue(dev);
761 	return;
762  epptimeout:
763 	printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
764 }
765 
766 /* ---------------------------------------------------------------------- */
767 /*
768  * ===================== network driver interface =========================
769  */
770 
771 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
772 {
773 	struct baycom_state *bc = netdev_priv(dev);
774 
775 	if (skb->data[0] != 0) {
776 		do_kiss_params(bc, skb->data, skb->len);
777 		dev_kfree_skb(skb);
778 		return NETDEV_TX_OK;
779 	}
780 	if (bc->skb)
781 		return NETDEV_TX_LOCKED;
782 	/* strip KISS byte */
783 	if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
784 		dev_kfree_skb(skb);
785 		return NETDEV_TX_OK;
786 	}
787 	netif_stop_queue(dev);
788 	bc->skb = skb;
789 	return NETDEV_TX_OK;
790 }
791 
792 /* --------------------------------------------------------------------- */
793 
794 static int baycom_set_mac_address(struct net_device *dev, void *addr)
795 {
796 	struct sockaddr *sa = (struct sockaddr *)addr;
797 
798 	/* addr is an AX.25 shifted ASCII mac address */
799 	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
800 	return 0;
801 }
802 
803 /* --------------------------------------------------------------------- */
804 
805 static void epp_wakeup(void *handle)
806 {
807         struct net_device *dev = (struct net_device *)handle;
808         struct baycom_state *bc = netdev_priv(dev);
809 
810         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
811         if (!parport_claim(bc->pdev))
812                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
813 }
814 
815 /* --------------------------------------------------------------------- */
816 
817 /*
818  * Open/initialize the board. This is called (in the current kernel)
819  * sometime after booting when the 'ifconfig' program is run.
820  *
821  * This routine should set everything up anew at each open, even
822  * registers that "should" only need to be set once at boot, so that
823  * there is non-reboot way to recover if something goes wrong.
824  */
825 
826 static int epp_open(struct net_device *dev)
827 {
828 	struct baycom_state *bc = netdev_priv(dev);
829         struct parport *pp = parport_find_base(dev->base_addr);
830 	unsigned int i, j;
831 	unsigned char tmp[128];
832 	unsigned char stat;
833 	unsigned long tstart;
834 
835         if (!pp) {
836                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
837                 return -ENXIO;
838         }
839 #if 0
840         if (pp->irq < 0) {
841                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
842 		parport_put_port(pp);
843                 return -ENXIO;
844         }
845 #endif
846 	if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
847                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
848 		       bc_drvname, pp->base);
849 		parport_put_port(pp);
850                 return -EIO;
851 	}
852 	memset(&bc->modem, 0, sizeof(bc->modem));
853         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
854 					   NULL, PARPORT_DEV_EXCL, dev);
855 	parport_put_port(pp);
856         if (!bc->pdev) {
857                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
858                 return -ENXIO;
859         }
860         if (parport_claim(bc->pdev)) {
861                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
862                 parport_unregister_device(bc->pdev);
863                 return -EBUSY;
864         }
865         dev->irq = /*pp->irq*/ 0;
866 	INIT_DELAYED_WORK(&bc->run_work, epp_bh);
867 	bc->work_running = 1;
868 	bc->modem = EPP_CONVENTIONAL;
869 	if (eppconfig(bc))
870 		printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
871 	else
872 		bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
873 	parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
874 	/* reset the modem */
875 	tmp[0] = 0;
876 	tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
877 	if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
878 		goto epptimeout;
879 	/* autoprobe baud rate */
880 	tstart = jiffies;
881 	i = 0;
882 	while (time_before(jiffies, tstart + HZ/3)) {
883 		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
884 			goto epptimeout;
885 		if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
886 			schedule();
887 			continue;
888 		}
889 		if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
890 			goto epptimeout;
891 		if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
892 			goto epptimeout;
893 		i += 256;
894 	}
895 	for (j = 0; j < 256; j++) {
896 		if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
897 			goto epptimeout;
898 		if (!(stat & EPP_NREF))
899 			break;
900 		if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
901 			goto epptimeout;
902 		i++;
903 	}
904 	tstart = jiffies - tstart;
905 	bc->bitrate = i * (8 * HZ) / tstart;
906 	j = 1;
907 	i = bc->bitrate >> 3;
908 	while (j < 7 && i > 150) {
909 		j++;
910 		i >>= 1;
911 	}
912 	printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n",
913 	       bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
914 	tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
915 	if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
916 		goto epptimeout;
917 	/*
918 	 * initialise hdlc variables
919 	 */
920 	bc->hdlcrx.state = 0;
921 	bc->hdlcrx.numbits = 0;
922 	bc->hdlctx.state = tx_idle;
923 	bc->hdlctx.bufcnt = 0;
924 	bc->hdlctx.slotcnt = bc->ch_params.slottime;
925 	bc->hdlctx.calibrate = 0;
926 	/* start the bottom half stuff */
927 	schedule_delayed_work(&bc->run_work, 1);
928 	netif_start_queue(dev);
929 	return 0;
930 
931  epptimeout:
932 	printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
933 	parport_write_control(pp, 0); /* reset the adapter */
934         parport_release(bc->pdev);
935         parport_unregister_device(bc->pdev);
936 	return -EIO;
937 }
938 
939 /* --------------------------------------------------------------------- */
940 
941 static int epp_close(struct net_device *dev)
942 {
943 	struct baycom_state *bc = netdev_priv(dev);
944 	struct parport *pp = bc->pdev->port;
945 	unsigned char tmp[1];
946 
947 	bc->work_running = 0;
948 	cancel_delayed_work_sync(&bc->run_work);
949 	bc->stat = EPP_DCDBIT;
950 	tmp[0] = 0;
951 	pp->ops->epp_write_addr(pp, tmp, 1, 0);
952 	parport_write_control(pp, 0); /* reset the adapter */
953         parport_release(bc->pdev);
954         parport_unregister_device(bc->pdev);
955 	if (bc->skb)
956 		dev_kfree_skb(bc->skb);
957 	bc->skb = NULL;
958 	printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
959 	       bc_drvname, dev->base_addr, dev->irq);
960 	return 0;
961 }
962 
963 /* --------------------------------------------------------------------- */
964 
965 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
966 {
967 	const char *cp;
968 
969 	if (strstr(modestr,"intclk"))
970 		bc->cfg.intclk = 1;
971 	if (strstr(modestr,"extclk"))
972 		bc->cfg.intclk = 0;
973 	if (strstr(modestr,"intmodem"))
974 		bc->cfg.extmodem = 0;
975 	if (strstr(modestr,"extmodem"))
976 		bc->cfg.extmodem = 1;
977 	if (strstr(modestr,"noloopback"))
978 		bc->cfg.loopback = 0;
979 	if (strstr(modestr,"loopback"))
980 		bc->cfg.loopback = 1;
981 	if ((cp = strstr(modestr,"fclk="))) {
982 		bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
983 		if (bc->cfg.fclk < 1000000)
984 			bc->cfg.fclk = 1000000;
985 		if (bc->cfg.fclk > 25000000)
986 			bc->cfg.fclk = 25000000;
987 	}
988 	if ((cp = strstr(modestr,"bps="))) {
989 		bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
990 		if (bc->cfg.bps < 1000)
991 			bc->cfg.bps = 1000;
992 		if (bc->cfg.bps > 1500000)
993 			bc->cfg.bps = 1500000;
994 	}
995 	return 0;
996 }
997 
998 /* --------------------------------------------------------------------- */
999 
1000 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1001 {
1002 	struct baycom_state *bc = netdev_priv(dev);
1003 	struct hdlcdrv_ioctl hi;
1004 
1005 	if (cmd != SIOCDEVPRIVATE)
1006 		return -ENOIOCTLCMD;
1007 
1008 	if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1009 		return -EFAULT;
1010 	switch (hi.cmd) {
1011 	default:
1012 		return -ENOIOCTLCMD;
1013 
1014 	case HDLCDRVCTL_GETCHANNELPAR:
1015 		hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1016 		hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1017 		hi.data.cp.slottime = bc->ch_params.slottime;
1018 		hi.data.cp.ppersist = bc->ch_params.ppersist;
1019 		hi.data.cp.fulldup = bc->ch_params.fulldup;
1020 		break;
1021 
1022 	case HDLCDRVCTL_SETCHANNELPAR:
1023 		if (!capable(CAP_NET_ADMIN))
1024 			return -EACCES;
1025 		bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1026 		bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1027 		bc->ch_params.slottime = hi.data.cp.slottime;
1028 		bc->ch_params.ppersist = hi.data.cp.ppersist;
1029 		bc->ch_params.fulldup = hi.data.cp.fulldup;
1030 		bc->hdlctx.slotcnt = 1;
1031 		return 0;
1032 
1033 	case HDLCDRVCTL_GETMODEMPAR:
1034 		hi.data.mp.iobase = dev->base_addr;
1035 		hi.data.mp.irq = dev->irq;
1036 		hi.data.mp.dma = dev->dma;
1037 		hi.data.mp.dma2 = 0;
1038 		hi.data.mp.seriobase = 0;
1039 		hi.data.mp.pariobase = 0;
1040 		hi.data.mp.midiiobase = 0;
1041 		break;
1042 
1043 	case HDLCDRVCTL_SETMODEMPAR:
1044 		if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1045 			return -EACCES;
1046 		dev->base_addr = hi.data.mp.iobase;
1047 		dev->irq = /*hi.data.mp.irq*/0;
1048 		dev->dma = /*hi.data.mp.dma*/0;
1049 		return 0;
1050 
1051 	case HDLCDRVCTL_GETSTAT:
1052 		hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1053 		hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1054 		hi.data.cs.ptt_keyed = bc->ptt_keyed;
1055 		hi.data.cs.tx_packets = dev->stats.tx_packets;
1056 		hi.data.cs.tx_errors = dev->stats.tx_errors;
1057 		hi.data.cs.rx_packets = dev->stats.rx_packets;
1058 		hi.data.cs.rx_errors = dev->stats.rx_errors;
1059 		break;
1060 
1061 	case HDLCDRVCTL_OLDGETSTAT:
1062 		hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1063 		hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1064 		hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1065 		break;
1066 
1067 	case HDLCDRVCTL_CALIBRATE:
1068 		if (!capable(CAP_SYS_RAWIO))
1069 			return -EACCES;
1070 		bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1071 		return 0;
1072 
1073 	case HDLCDRVCTL_DRIVERNAME:
1074 		strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1075 		break;
1076 
1077 	case HDLCDRVCTL_GETMODE:
1078 		sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1079 			bc->cfg.intclk ? "int" : "ext",
1080 			bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1081 			bc->cfg.loopback ? ",loopback" : "");
1082 		break;
1083 
1084 	case HDLCDRVCTL_SETMODE:
1085 		if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1086 			return -EACCES;
1087 		hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1088 		return baycom_setmode(bc, hi.data.modename);
1089 
1090 	case HDLCDRVCTL_MODELIST:
1091 		strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1092 			sizeof(hi.data.modename));
1093 		break;
1094 
1095 	case HDLCDRVCTL_MODEMPARMASK:
1096 		return HDLCDRV_PARMASK_IOBASE;
1097 
1098 	}
1099 	if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1100 		return -EFAULT;
1101 	return 0;
1102 }
1103 
1104 /* --------------------------------------------------------------------- */
1105 
1106 static const struct net_device_ops baycom_netdev_ops = {
1107 	.ndo_open	     = epp_open,
1108 	.ndo_stop	     = epp_close,
1109 	.ndo_do_ioctl	     = baycom_ioctl,
1110 	.ndo_start_xmit      = baycom_send_packet,
1111 	.ndo_set_mac_address = baycom_set_mac_address,
1112 };
1113 
1114 /*
1115  * Check for a network adaptor of this type, and return '0' if one exists.
1116  * If dev->base_addr == 0, probe all likely locations.
1117  * If dev->base_addr == 1, always return failure.
1118  * If dev->base_addr == 2, allocate space for the device and return success
1119  * (detachable devices only).
1120  */
1121 static void baycom_probe(struct net_device *dev)
1122 {
1123 	const struct hdlcdrv_channel_params dflt_ch_params = {
1124 		20, 2, 10, 40, 0
1125 	};
1126 	struct baycom_state *bc;
1127 
1128 	/*
1129 	 * not a real probe! only initialize data structures
1130 	 */
1131 	bc = netdev_priv(dev);
1132 	/*
1133 	 * initialize the baycom_state struct
1134 	 */
1135 	bc->ch_params = dflt_ch_params;
1136 	bc->ptt_keyed = 0;
1137 
1138 	/*
1139 	 * initialize the device struct
1140 	 */
1141 
1142 	/* Fill in the fields of the device structure */
1143 	bc->skb = NULL;
1144 
1145 	dev->netdev_ops = &baycom_netdev_ops;
1146 	dev->header_ops = &ax25_header_ops;
1147 
1148 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1149 	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1150 	dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1151 	dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1152 	memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1153 	memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1154 	dev->tx_queue_len = 16;
1155 
1156 	/* New style flags */
1157 	dev->flags = 0;
1158 }
1159 
1160 /* --------------------------------------------------------------------- */
1161 
1162 /*
1163  * command line settable parameters
1164  */
1165 static char *mode[NR_PORTS] = { "", };
1166 static int iobase[NR_PORTS] = { 0x378, };
1167 
1168 module_param_array(mode, charp, NULL, 0);
1169 MODULE_PARM_DESC(mode, "baycom operating mode");
1170 module_param_array(iobase, int, NULL, 0);
1171 MODULE_PARM_DESC(iobase, "baycom io base address");
1172 
1173 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1174 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1175 MODULE_LICENSE("GPL");
1176 
1177 /* --------------------------------------------------------------------- */
1178 
1179 static void __init baycom_epp_dev_setup(struct net_device *dev)
1180 {
1181 	struct baycom_state *bc = netdev_priv(dev);
1182 
1183 	/*
1184 	 * initialize part of the baycom_state struct
1185 	 */
1186 	bc->dev = dev;
1187 	bc->magic = BAYCOM_MAGIC;
1188 	bc->cfg.fclk = 19666600;
1189 	bc->cfg.bps = 9600;
1190 	/*
1191 	 * initialize part of the device struct
1192 	 */
1193 	baycom_probe(dev);
1194 }
1195 
1196 static int __init init_baycomepp(void)
1197 {
1198 	int i, found = 0;
1199 	char set_hw = 1;
1200 
1201 	printk(bc_drvinfo);
1202 	/*
1203 	 * register net devices
1204 	 */
1205 	for (i = 0; i < NR_PORTS; i++) {
1206 		struct net_device *dev;
1207 
1208 		dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1209 				   baycom_epp_dev_setup);
1210 
1211 		if (!dev) {
1212 			printk(KERN_WARNING "bce%d : out of memory\n", i);
1213 			return found ? 0 : -ENOMEM;
1214 		}
1215 
1216 		sprintf(dev->name, "bce%d", i);
1217 		dev->base_addr = iobase[i];
1218 
1219 		if (!mode[i])
1220 			set_hw = 0;
1221 		if (!set_hw)
1222 			iobase[i] = 0;
1223 
1224 		if (register_netdev(dev)) {
1225 			printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1226 			free_netdev(dev);
1227 			break;
1228 		}
1229 		if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1230 			set_hw = 0;
1231 		baycom_device[i] = dev;
1232 		found++;
1233 	}
1234 
1235 	return found ? 0 : -ENXIO;
1236 }
1237 
1238 static void __exit cleanup_baycomepp(void)
1239 {
1240 	int i;
1241 
1242 	for(i = 0; i < NR_PORTS; i++) {
1243 		struct net_device *dev = baycom_device[i];
1244 
1245 		if (dev) {
1246 			struct baycom_state *bc = netdev_priv(dev);
1247 			if (bc->magic == BAYCOM_MAGIC) {
1248 				unregister_netdev(dev);
1249 				free_netdev(dev);
1250 			} else
1251 				printk(paranoia_str, "cleanup_module");
1252 		}
1253 	}
1254 }
1255 
1256 module_init(init_baycomepp);
1257 module_exit(cleanup_baycomepp);
1258 
1259 /* --------------------------------------------------------------------- */
1260 
1261 #ifndef MODULE
1262 
1263 /*
1264  * format: baycom_epp=io,mode
1265  * mode: fpga config options
1266  */
1267 
1268 static int __init baycom_epp_setup(char *str)
1269 {
1270         static unsigned __initdata nr_dev = 0;
1271 	int ints[2];
1272 
1273         if (nr_dev >= NR_PORTS)
1274                 return 0;
1275 	str = get_options(str, 2, ints);
1276 	if (ints[0] < 1)
1277 		return 0;
1278 	mode[nr_dev] = str;
1279 	iobase[nr_dev] = ints[1];
1280 	nr_dev++;
1281 	return 1;
1282 }
1283 
1284 __setup("baycom_epp=", baycom_epp_setup);
1285 
1286 #endif /* MODULE */
1287 /* --------------------------------------------------------------------- */
1288