1 /*****************************************************************************/
2
3 /*
4 * baycom_epp.c -- baycom epp radio modem driver.
5 *
6 * Copyright (C) 1998-2000
7 * Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * Please note that the GPL allows you to use the driver, NOT the radio.
24 * In order to use the radio, you need a license from the communications
25 * authority of your country.
26 *
27 *
28 * History:
29 * 0.1 xx.xx.1998 Initial version by Matthias Welwarsky (dg2fef)
30 * 0.2 21.04.1998 Massive rework by Thomas Sailer
31 * Integrated FPGA EPP modem configuration routines
32 * 0.3 11.05.1998 Took FPGA config out and moved it into a separate program
33 * 0.4 26.07.1999 Adapted to new lowlevel parport driver interface
34 * 0.5 03.08.1999 adapt to Linus' new __setup/__initcall
35 * removed some pre-2.2 kernel compatibility cruft
36 * 0.6 10.08.1999 Check if parport can do SPP and is safe to access during interrupt contexts
37 * 0.7 12.02.2000 adapted to softnet driver interface
38 *
39 */
40
41 /*****************************************************************************/
42
43 #include <linux/crc-ccitt.h>
44 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/init.h>
47 #include <linux/string.h>
48 #include <linux/workqueue.h>
49 #include <linux/fs.h>
50 #include <linux/parport.h>
51 #include <linux/if_arp.h>
52 #include <linux/hdlcdrv.h>
53 #include <linux/baycom.h>
54 #include <linux/jiffies.h>
55 #include <linux/random.h>
56 #include <net/ax25.h>
57 #include <asm/uaccess.h>
58
59 /* --------------------------------------------------------------------- */
60
61 #define BAYCOM_DEBUG
62 #define BAYCOM_MAGIC 19730510
63
64 /* --------------------------------------------------------------------- */
65
66 static const char paranoia_str[] = KERN_ERR
67 "baycom_epp: bad magic number for hdlcdrv_state struct in routine %s\n";
68
69 static const char bc_drvname[] = "baycom_epp";
70 static const char bc_drvinfo[] = KERN_INFO "baycom_epp: (C) 1998-2000 Thomas Sailer, HB9JNX/AE4WA\n"
71 KERN_INFO "baycom_epp: version 0.7 compiled " __TIME__ " " __DATE__ "\n";
72
73 /* --------------------------------------------------------------------- */
74
75 #define NR_PORTS 4
76
77 static struct net_device *baycom_device[NR_PORTS];
78
79 /* --------------------------------------------------------------------- */
80
81 /* EPP status register */
82 #define EPP_DCDBIT 0x80
83 #define EPP_PTTBIT 0x08
84 #define EPP_NREF 0x01
85 #define EPP_NRAEF 0x02
86 #define EPP_NRHF 0x04
87 #define EPP_NTHF 0x20
88 #define EPP_NTAEF 0x10
89 #define EPP_NTEF EPP_PTTBIT
90
91 /* EPP control register */
92 #define EPP_TX_FIFO_ENABLE 0x10
93 #define EPP_RX_FIFO_ENABLE 0x08
94 #define EPP_MODEM_ENABLE 0x20
95 #define EPP_LEDS 0xC0
96 #define EPP_IRQ_ENABLE 0x10
97
98 /* LPT registers */
99 #define LPTREG_ECONTROL 0x402
100 #define LPTREG_CONFIGB 0x401
101 #define LPTREG_CONFIGA 0x400
102 #define LPTREG_EPPDATA 0x004
103 #define LPTREG_EPPADDR 0x003
104 #define LPTREG_CONTROL 0x002
105 #define LPTREG_STATUS 0x001
106 #define LPTREG_DATA 0x000
107
108 /* LPT control register */
109 #define LPTCTRL_PROGRAM 0x04 /* 0 to reprogram */
110 #define LPTCTRL_WRITE 0x01
111 #define LPTCTRL_ADDRSTB 0x08
112 #define LPTCTRL_DATASTB 0x02
113 #define LPTCTRL_INTEN 0x10
114
115 /* LPT status register */
116 #define LPTSTAT_SHIFT_NINTR 6
117 #define LPTSTAT_WAIT 0x80
118 #define LPTSTAT_NINTR (1<<LPTSTAT_SHIFT_NINTR)
119 #define LPTSTAT_PE 0x20
120 #define LPTSTAT_DONE 0x10
121 #define LPTSTAT_NERROR 0x08
122 #define LPTSTAT_EPPTIMEOUT 0x01
123
124 /* LPT data register */
125 #define LPTDATA_SHIFT_TDI 0
126 #define LPTDATA_SHIFT_TMS 2
127 #define LPTDATA_TDI (1<<LPTDATA_SHIFT_TDI)
128 #define LPTDATA_TCK 0x02
129 #define LPTDATA_TMS (1<<LPTDATA_SHIFT_TMS)
130 #define LPTDATA_INITBIAS 0x80
131
132
133 /* EPP modem config/status bits */
134 #define EPP_DCDBIT 0x80
135 #define EPP_PTTBIT 0x08
136 #define EPP_RXEBIT 0x01
137 #define EPP_RXAEBIT 0x02
138 #define EPP_RXHFULL 0x04
139
140 #define EPP_NTHF 0x20
141 #define EPP_NTAEF 0x10
142 #define EPP_NTEF EPP_PTTBIT
143
144 #define EPP_TX_FIFO_ENABLE 0x10
145 #define EPP_RX_FIFO_ENABLE 0x08
146 #define EPP_MODEM_ENABLE 0x20
147 #define EPP_LEDS 0xC0
148 #define EPP_IRQ_ENABLE 0x10
149
150 /* Xilinx 4k JTAG instructions */
151 #define XC4K_IRLENGTH 3
152 #define XC4K_EXTEST 0
153 #define XC4K_PRELOAD 1
154 #define XC4K_CONFIGURE 5
155 #define XC4K_BYPASS 7
156
157 #define EPP_CONVENTIONAL 0
158 #define EPP_FPGA 1
159 #define EPP_FPGAEXTSTATUS 2
160
161 #define TXBUFFER_SIZE ((HDLCDRV_MAXFLEN*6/5)+8)
162
163 /* ---------------------------------------------------------------------- */
164 /*
165 * Information that need to be kept for each board.
166 */
167
168 struct baycom_state {
169 int magic;
170
171 struct pardevice *pdev;
172 struct net_device *dev;
173 unsigned int work_running;
174 struct delayed_work run_work;
175 unsigned int modem;
176 unsigned int bitrate;
177 unsigned char stat;
178
179 struct {
180 unsigned int intclk;
181 unsigned int fclk;
182 unsigned int bps;
183 unsigned int extmodem;
184 unsigned int loopback;
185 } cfg;
186
187 struct hdlcdrv_channel_params ch_params;
188
189 struct {
190 unsigned int bitbuf, bitstream, numbits, state;
191 unsigned char *bufptr;
192 int bufcnt;
193 unsigned char buf[TXBUFFER_SIZE];
194 } hdlcrx;
195
196 struct {
197 int calibrate;
198 int slotcnt;
199 int flags;
200 enum { tx_idle = 0, tx_keyup, tx_data, tx_tail } state;
201 unsigned char *bufptr;
202 int bufcnt;
203 unsigned char buf[TXBUFFER_SIZE];
204 } hdlctx;
205
206 struct net_device_stats stats;
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
check_crc_ccitt(const unsigned char * buf,int cnt)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
calc_crc_ccitt(const unsigned char * buf,int cnt)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
baycom_int_freq(struct baycom_state * bc)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 */
eppconfig(struct baycom_state * bc)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
do_kiss_params(struct baycom_state * bc,unsigned char * data,unsigned long len)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
encode_hdlc(struct baycom_state * bc)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->stats.tx_packets++;
427 }
428
429 /* ---------------------------------------------------------------------- */
430
transmit(struct baycom_state * bc,int cnt,unsigned char stat)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
do_rxpacket(struct net_device * dev)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 bc->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 bc->stats.rx_packets++;
559 }
560
receive(struct net_device * dev,int cnt)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 /* not 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
epp_bh(struct work_struct * work)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
baycom_send_packet(struct sk_buff * skb,struct net_device * dev)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 0;
779 }
780 if (bc->skb)
781 return -1;
782 /* strip KISS byte */
783 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
784 dev_kfree_skb(skb);
785 return 0;
786 }
787 netif_stop_queue(dev);
788 bc->skb = skb;
789 return 0;
790 }
791
792 /* --------------------------------------------------------------------- */
793
baycom_set_mac_address(struct net_device * dev,void * addr)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
baycom_get_stats(struct net_device * dev)805 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
806 {
807 struct baycom_state *bc = netdev_priv(dev);
808
809 /*
810 * Get the current statistics. This may be called with the
811 * card open or closed.
812 */
813 return &bc->stats;
814 }
815
816 /* --------------------------------------------------------------------- */
817
epp_wakeup(void * handle)818 static void epp_wakeup(void *handle)
819 {
820 struct net_device *dev = (struct net_device *)handle;
821 struct baycom_state *bc = netdev_priv(dev);
822
823 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
824 if (!parport_claim(bc->pdev))
825 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
826 }
827
828 /* --------------------------------------------------------------------- */
829
830 /*
831 * Open/initialize the board. This is called (in the current kernel)
832 * sometime after booting when the 'ifconfig' program is run.
833 *
834 * This routine should set everything up anew at each open, even
835 * registers that "should" only need to be set once at boot, so that
836 * there is non-reboot way to recover if something goes wrong.
837 */
838
epp_open(struct net_device * dev)839 static int epp_open(struct net_device *dev)
840 {
841 struct baycom_state *bc = netdev_priv(dev);
842 struct parport *pp = parport_find_base(dev->base_addr);
843 unsigned int i, j;
844 unsigned char tmp[128];
845 unsigned char stat;
846 unsigned long tstart;
847
848 if (!pp) {
849 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
850 return -ENXIO;
851 }
852 #if 0
853 if (pp->irq < 0) {
854 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
855 parport_put_port(pp);
856 return -ENXIO;
857 }
858 #endif
859 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
860 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
861 bc_drvname, pp->base);
862 parport_put_port(pp);
863 return -EIO;
864 }
865 memset(&bc->modem, 0, sizeof(bc->modem));
866 bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
867 NULL, PARPORT_DEV_EXCL, dev);
868 parport_put_port(pp);
869 if (!bc->pdev) {
870 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
871 return -ENXIO;
872 }
873 if (parport_claim(bc->pdev)) {
874 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
875 parport_unregister_device(bc->pdev);
876 return -EBUSY;
877 }
878 dev->irq = /*pp->irq*/ 0;
879 INIT_DELAYED_WORK(&bc->run_work, epp_bh);
880 bc->work_running = 1;
881 bc->modem = EPP_CONVENTIONAL;
882 if (eppconfig(bc))
883 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
884 else
885 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
886 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
887 /* reset the modem */
888 tmp[0] = 0;
889 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
890 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
891 goto epptimeout;
892 /* autoprobe baud rate */
893 tstart = jiffies;
894 i = 0;
895 while (time_before(jiffies, tstart + HZ/3)) {
896 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
897 goto epptimeout;
898 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
899 schedule();
900 continue;
901 }
902 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
903 goto epptimeout;
904 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
905 goto epptimeout;
906 i += 256;
907 }
908 for (j = 0; j < 256; j++) {
909 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
910 goto epptimeout;
911 if (!(stat & EPP_NREF))
912 break;
913 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
914 goto epptimeout;
915 i++;
916 }
917 tstart = jiffies - tstart;
918 bc->bitrate = i * (8 * HZ) / tstart;
919 j = 1;
920 i = bc->bitrate >> 3;
921 while (j < 7 && i > 150) {
922 j++;
923 i >>= 1;
924 }
925 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n",
926 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
927 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
928 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
929 goto epptimeout;
930 /*
931 * initialise hdlc variables
932 */
933 bc->hdlcrx.state = 0;
934 bc->hdlcrx.numbits = 0;
935 bc->hdlctx.state = tx_idle;
936 bc->hdlctx.bufcnt = 0;
937 bc->hdlctx.slotcnt = bc->ch_params.slottime;
938 bc->hdlctx.calibrate = 0;
939 /* start the bottom half stuff */
940 schedule_delayed_work(&bc->run_work, 1);
941 netif_start_queue(dev);
942 return 0;
943
944 epptimeout:
945 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
946 parport_write_control(pp, 0); /* reset the adapter */
947 parport_release(bc->pdev);
948 parport_unregister_device(bc->pdev);
949 return -EIO;
950 }
951
952 /* --------------------------------------------------------------------- */
953
epp_close(struct net_device * dev)954 static int epp_close(struct net_device *dev)
955 {
956 struct baycom_state *bc = netdev_priv(dev);
957 struct parport *pp = bc->pdev->port;
958 unsigned char tmp[1];
959
960 bc->work_running = 0;
961 cancel_delayed_work_sync(&bc->run_work);
962 bc->stat = EPP_DCDBIT;
963 tmp[0] = 0;
964 pp->ops->epp_write_addr(pp, tmp, 1, 0);
965 parport_write_control(pp, 0); /* reset the adapter */
966 parport_release(bc->pdev);
967 parport_unregister_device(bc->pdev);
968 if (bc->skb)
969 dev_kfree_skb(bc->skb);
970 bc->skb = NULL;
971 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
972 bc_drvname, dev->base_addr, dev->irq);
973 return 0;
974 }
975
976 /* --------------------------------------------------------------------- */
977
baycom_setmode(struct baycom_state * bc,const char * modestr)978 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
979 {
980 const char *cp;
981
982 if (strstr(modestr,"intclk"))
983 bc->cfg.intclk = 1;
984 if (strstr(modestr,"extclk"))
985 bc->cfg.intclk = 0;
986 if (strstr(modestr,"intmodem"))
987 bc->cfg.extmodem = 0;
988 if (strstr(modestr,"extmodem"))
989 bc->cfg.extmodem = 1;
990 if (strstr(modestr,"noloopback"))
991 bc->cfg.loopback = 0;
992 if (strstr(modestr,"loopback"))
993 bc->cfg.loopback = 1;
994 if ((cp = strstr(modestr,"fclk="))) {
995 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
996 if (bc->cfg.fclk < 1000000)
997 bc->cfg.fclk = 1000000;
998 if (bc->cfg.fclk > 25000000)
999 bc->cfg.fclk = 25000000;
1000 }
1001 if ((cp = strstr(modestr,"bps="))) {
1002 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1003 if (bc->cfg.bps < 1000)
1004 bc->cfg.bps = 1000;
1005 if (bc->cfg.bps > 1500000)
1006 bc->cfg.bps = 1500000;
1007 }
1008 return 0;
1009 }
1010
1011 /* --------------------------------------------------------------------- */
1012
baycom_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1013 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1014 {
1015 struct baycom_state *bc = netdev_priv(dev);
1016 struct hdlcdrv_ioctl hi;
1017
1018 if (cmd != SIOCDEVPRIVATE)
1019 return -ENOIOCTLCMD;
1020
1021 if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1022 return -EFAULT;
1023 switch (hi.cmd) {
1024 default:
1025 return -ENOIOCTLCMD;
1026
1027 case HDLCDRVCTL_GETCHANNELPAR:
1028 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1029 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1030 hi.data.cp.slottime = bc->ch_params.slottime;
1031 hi.data.cp.ppersist = bc->ch_params.ppersist;
1032 hi.data.cp.fulldup = bc->ch_params.fulldup;
1033 break;
1034
1035 case HDLCDRVCTL_SETCHANNELPAR:
1036 if (!capable(CAP_NET_ADMIN))
1037 return -EACCES;
1038 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1039 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1040 bc->ch_params.slottime = hi.data.cp.slottime;
1041 bc->ch_params.ppersist = hi.data.cp.ppersist;
1042 bc->ch_params.fulldup = hi.data.cp.fulldup;
1043 bc->hdlctx.slotcnt = 1;
1044 return 0;
1045
1046 case HDLCDRVCTL_GETMODEMPAR:
1047 hi.data.mp.iobase = dev->base_addr;
1048 hi.data.mp.irq = dev->irq;
1049 hi.data.mp.dma = dev->dma;
1050 hi.data.mp.dma2 = 0;
1051 hi.data.mp.seriobase = 0;
1052 hi.data.mp.pariobase = 0;
1053 hi.data.mp.midiiobase = 0;
1054 break;
1055
1056 case HDLCDRVCTL_SETMODEMPAR:
1057 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1058 return -EACCES;
1059 dev->base_addr = hi.data.mp.iobase;
1060 dev->irq = /*hi.data.mp.irq*/0;
1061 dev->dma = /*hi.data.mp.dma*/0;
1062 return 0;
1063
1064 case HDLCDRVCTL_GETSTAT:
1065 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1066 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1067 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1068 hi.data.cs.tx_packets = bc->stats.tx_packets;
1069 hi.data.cs.tx_errors = bc->stats.tx_errors;
1070 hi.data.cs.rx_packets = bc->stats.rx_packets;
1071 hi.data.cs.rx_errors = bc->stats.rx_errors;
1072 break;
1073
1074 case HDLCDRVCTL_OLDGETSTAT:
1075 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1076 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1077 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1078 break;
1079
1080 case HDLCDRVCTL_CALIBRATE:
1081 if (!capable(CAP_SYS_RAWIO))
1082 return -EACCES;
1083 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1084 return 0;
1085
1086 case HDLCDRVCTL_DRIVERNAME:
1087 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1088 break;
1089
1090 case HDLCDRVCTL_GETMODE:
1091 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1092 bc->cfg.intclk ? "int" : "ext",
1093 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1094 bc->cfg.loopback ? ",loopback" : "");
1095 break;
1096
1097 case HDLCDRVCTL_SETMODE:
1098 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1099 return -EACCES;
1100 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1101 return baycom_setmode(bc, hi.data.modename);
1102
1103 case HDLCDRVCTL_MODELIST:
1104 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1105 sizeof(hi.data.modename));
1106 break;
1107
1108 case HDLCDRVCTL_MODEMPARMASK:
1109 return HDLCDRV_PARMASK_IOBASE;
1110
1111 }
1112 if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1113 return -EFAULT;
1114 return 0;
1115 }
1116
1117 /* --------------------------------------------------------------------- */
1118
1119 /*
1120 * Check for a network adaptor of this type, and return '0' if one exists.
1121 * If dev->base_addr == 0, probe all likely locations.
1122 * If dev->base_addr == 1, always return failure.
1123 * If dev->base_addr == 2, allocate space for the device and return success
1124 * (detachable devices only).
1125 */
baycom_probe(struct net_device * dev)1126 static void baycom_probe(struct net_device *dev)
1127 {
1128 const struct hdlcdrv_channel_params dflt_ch_params = {
1129 20, 2, 10, 40, 0
1130 };
1131 struct baycom_state *bc;
1132
1133 /*
1134 * not a real probe! only initialize data structures
1135 */
1136 bc = netdev_priv(dev);
1137 /*
1138 * initialize the baycom_state struct
1139 */
1140 bc->ch_params = dflt_ch_params;
1141 bc->ptt_keyed = 0;
1142
1143 /*
1144 * initialize the device struct
1145 */
1146 dev->open = epp_open;
1147 dev->stop = epp_close;
1148 dev->do_ioctl = baycom_ioctl;
1149 dev->hard_start_xmit = baycom_send_packet;
1150 dev->get_stats = baycom_get_stats;
1151
1152 /* Fill in the fields of the device structure */
1153 bc->skb = NULL;
1154
1155 dev->header_ops = &ax25_header_ops;
1156 dev->set_mac_address = baycom_set_mac_address;
1157
1158 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1159 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1160 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
1161 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
1162 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1163 memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1164 dev->tx_queue_len = 16;
1165
1166 /* New style flags */
1167 dev->flags = 0;
1168 }
1169
1170 /* --------------------------------------------------------------------- */
1171
1172 /*
1173 * command line settable parameters
1174 */
1175 static const char *mode[NR_PORTS] = { "", };
1176 static int iobase[NR_PORTS] = { 0x378, };
1177
1178 module_param_array(mode, charp, NULL, 0);
1179 MODULE_PARM_DESC(mode, "baycom operating mode");
1180 module_param_array(iobase, int, NULL, 0);
1181 MODULE_PARM_DESC(iobase, "baycom io base address");
1182
1183 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1184 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1185 MODULE_LICENSE("GPL");
1186
1187 /* --------------------------------------------------------------------- */
1188
baycom_epp_dev_setup(struct net_device * dev)1189 static void __init baycom_epp_dev_setup(struct net_device *dev)
1190 {
1191 struct baycom_state *bc = netdev_priv(dev);
1192
1193 /*
1194 * initialize part of the baycom_state struct
1195 */
1196 bc->dev = dev;
1197 bc->magic = BAYCOM_MAGIC;
1198 bc->cfg.fclk = 19666600;
1199 bc->cfg.bps = 9600;
1200 /*
1201 * initialize part of the device struct
1202 */
1203 baycom_probe(dev);
1204 }
1205
init_baycomepp(void)1206 static int __init init_baycomepp(void)
1207 {
1208 int i, found = 0;
1209 char set_hw = 1;
1210
1211 printk(bc_drvinfo);
1212 /*
1213 * register net devices
1214 */
1215 for (i = 0; i < NR_PORTS; i++) {
1216 struct net_device *dev;
1217
1218 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1219 baycom_epp_dev_setup);
1220
1221 if (!dev) {
1222 printk(KERN_WARNING "bce%d : out of memory\n", i);
1223 return found ? 0 : -ENOMEM;
1224 }
1225
1226 sprintf(dev->name, "bce%d", i);
1227 dev->base_addr = iobase[i];
1228
1229 if (!mode[i])
1230 set_hw = 0;
1231 if (!set_hw)
1232 iobase[i] = 0;
1233
1234 if (register_netdev(dev)) {
1235 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1236 free_netdev(dev);
1237 break;
1238 }
1239 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1240 set_hw = 0;
1241 baycom_device[i] = dev;
1242 found++;
1243 }
1244
1245 return found ? 0 : -ENXIO;
1246 }
1247
cleanup_baycomepp(void)1248 static void __exit cleanup_baycomepp(void)
1249 {
1250 int i;
1251
1252 for(i = 0; i < NR_PORTS; i++) {
1253 struct net_device *dev = baycom_device[i];
1254
1255 if (dev) {
1256 struct baycom_state *bc = netdev_priv(dev);
1257 if (bc->magic == BAYCOM_MAGIC) {
1258 unregister_netdev(dev);
1259 free_netdev(dev);
1260 } else
1261 printk(paranoia_str, "cleanup_module");
1262 }
1263 }
1264 }
1265
1266 module_init(init_baycomepp);
1267 module_exit(cleanup_baycomepp);
1268
1269 /* --------------------------------------------------------------------- */
1270
1271 #ifndef MODULE
1272
1273 /*
1274 * format: baycom_epp=io,mode
1275 * mode: fpga config options
1276 */
1277
baycom_epp_setup(char * str)1278 static int __init baycom_epp_setup(char *str)
1279 {
1280 static unsigned __initdata nr_dev = 0;
1281 int ints[2];
1282
1283 if (nr_dev >= NR_PORTS)
1284 return 0;
1285 str = get_options(str, 2, ints);
1286 if (ints[0] < 1)
1287 return 0;
1288 mode[nr_dev] = str;
1289 iobase[nr_dev] = ints[1];
1290 nr_dev++;
1291 return 1;
1292 }
1293
1294 __setup("baycom_epp=", baycom_epp_setup);
1295
1296 #endif /* MODULE */
1297 /* --------------------------------------------------------------------- */
1298