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Replace local random function with random32()
[wandboard.git] / drivers / net / hamradio / baycom_epp.c
blob84aa2117c0ee52b0f296f265317afbae773860d4
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
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, 1);
324 }
325
326 /* ---------------------------------------------------------------------- */
327
328 static void epp_interrupt(int irq, void *dev_id)
329 {
330 }
331
332 /* ---------------------------------------------------------------------- */
333
334 static inline void do_kiss_params(struct baycom_state *bc,
335 unsigned char *data, unsigned long len)
336 {
337
338 #ifdef KISS_VERBOSE
339 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
340 #else /* KISS_VERBOSE */
341 #define PKP(a,b)
342 #endif /* KISS_VERBOSE */
343
344 if (len < 2)
345 return;
346 switch(data[0]) {
347 case PARAM_TXDELAY:
348 bc->ch_params.tx_delay = data[1];
349 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
350 break;
351 case PARAM_PERSIST:
352 bc->ch_params.ppersist = data[1];
353 PKP("p persistence = %u", bc->ch_params.ppersist);
354 break;
355 case PARAM_SLOTTIME:
356 bc->ch_params.slottime = data[1];
357 PKP("slot time = %ums", bc->ch_params.slottime);
358 break;
359 case PARAM_TXTAIL:
360 bc->ch_params.tx_tail = data[1];
361 PKP("TX tail = %ums", bc->ch_params.tx_tail);
362 break;
363 case PARAM_FULLDUP:
364 bc->ch_params.fulldup = !!data[1];
365 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
366 break;
367 default:
368 break;
369 }
370 #undef PKP
371 }
372
373 /* --------------------------------------------------------------------- */
374
375 static void encode_hdlc(struct baycom_state *bc)
376 {
377 struct sk_buff *skb;
378 unsigned char *wp, *bp;
379 int pkt_len;
380 unsigned bitstream, notbitstream, bitbuf, numbit, crc;
381 unsigned char crcarr[2];
382 int j;
383
384 if (bc->hdlctx.bufcnt > 0)
385 return;
386 skb = bc->skb;
387 if (!skb)
388 return;
389 bc->skb = NULL;
390 pkt_len = skb->len-1; /* strip KISS byte */
391 wp = bc->hdlctx.buf;
392 bp = skb->data+1;
393 crc = calc_crc_ccitt(bp, pkt_len);
394 crcarr[0] = crc;
395 crcarr[1] = crc >> 8;
396 *wp++ = 0x7e;
397 bitstream = bitbuf = numbit = 0;
398 while (pkt_len > -2) {
399 bitstream >>= 8;
400 bitstream |= ((unsigned int)*bp) << 8;
401 bitbuf |= ((unsigned int)*bp) << numbit;
402 notbitstream = ~bitstream;
403 bp++;
404 pkt_len--;
405 if (!pkt_len)
406 bp = crcarr;
407 for (j = 0; j < 8; j++)
408 if (unlikely(!(notbitstream & (0x1f0 << j)))) {
409 bitstream &= ~(0x100 << j);
410 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
411 ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
412 numbit++;
413 notbitstream = ~bitstream;
414 }
415 numbit += 8;
416 while (numbit >= 8) {
417 *wp++ = bitbuf;
418 bitbuf >>= 8;
419 numbit -= 8;
420 }
421 }
422 bitbuf |= 0x7e7e << numbit;
423 numbit += 16;
424 while (numbit >= 8) {
425 *wp++ = bitbuf;
426 bitbuf >>= 8;
427 numbit -= 8;
428 }
429 bc->hdlctx.bufptr = bc->hdlctx.buf;
430 bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
431 dev_kfree_skb(skb);
432 bc->stats.tx_packets++;
433 }
434
435 /* ---------------------------------------------------------------------- */
436
437 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
438 {
439 struct parport *pp = bc->pdev->port;
440 unsigned char tmp[128];
441 int i, j;
442
443 if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
444 bc->hdlctx.state = tx_idle;
445 if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
446 if (bc->hdlctx.bufcnt <= 0)
447 encode_hdlc(bc);
448 if (bc->hdlctx.bufcnt <= 0)
449 return 0;
450 if (!bc->ch_params.fulldup) {
451 if (!(stat & EPP_DCDBIT)) {
452 bc->hdlctx.slotcnt = bc->ch_params.slottime;
453 return 0;
454 }
455 if ((--bc->hdlctx.slotcnt) > 0)
456 return 0;
457 bc->hdlctx.slotcnt = bc->ch_params.slottime;
458 if ((random32() % 256) > bc->ch_params.ppersist)
459 return 0;
460 }
461 }
462 if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
463 bc->hdlctx.state = tx_keyup;
464 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
465 bc->ptt_keyed++;
466 }
467 while (cnt > 0) {
468 switch (bc->hdlctx.state) {
469 case tx_keyup:
470 i = min_t(int, cnt, bc->hdlctx.flags);
471 cnt -= i;
472 bc->hdlctx.flags -= i;
473 if (bc->hdlctx.flags <= 0)
474 bc->hdlctx.state = tx_data;
475 memset(tmp, 0x7e, sizeof(tmp));
476 while (i > 0) {
477 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
478 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
479 return -1;
480 i -= j;
481 }
482 break;
483
484 case tx_data:
485 if (bc->hdlctx.bufcnt <= 0) {
486 encode_hdlc(bc);
487 if (bc->hdlctx.bufcnt <= 0) {
488 bc->hdlctx.state = tx_tail;
489 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
490 break;
491 }
492 }
493 i = min_t(int, cnt, bc->hdlctx.bufcnt);
494 bc->hdlctx.bufcnt -= i;
495 cnt -= i;
496 if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
497 return -1;
498 bc->hdlctx.bufptr += i;
499 break;
500
501 case tx_tail:
502 encode_hdlc(bc);
503 if (bc->hdlctx.bufcnt > 0) {
504 bc->hdlctx.state = tx_data;
505 break;
506 }
507 i = min_t(int, cnt, bc->hdlctx.flags);
508 if (i) {
509 cnt -= i;
510 bc->hdlctx.flags -= i;
511 memset(tmp, 0x7e, sizeof(tmp));
512 while (i > 0) {
513 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
514 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
515 return -1;
516 i -= j;
517 }
518 break;
519 }
520
521 default: /* fall through */
522 if (bc->hdlctx.calibrate <= 0)
523 return 0;
524 i = min_t(int, cnt, bc->hdlctx.calibrate);
525 cnt -= i;
526 bc->hdlctx.calibrate -= i;
527 memset(tmp, 0, sizeof(tmp));
528 while (i > 0) {
529 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
530 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
531 return -1;
532 i -= j;
533 }
534 break;
535 }
536 }
537 return 0;
538 }
539
540 /* ---------------------------------------------------------------------- */
541
542 static void do_rxpacket(struct net_device *dev)
543 {
544 struct baycom_state *bc = netdev_priv(dev);
545 struct sk_buff *skb;
546 unsigned char *cp;
547 unsigned pktlen;
548
549 if (bc->hdlcrx.bufcnt < 4)
550 return;
551 if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt))
552 return;
553 pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
554 if (!(skb = dev_alloc_skb(pktlen))) {
555 printk("%s: memory squeeze, dropping packet\n", dev->name);
556 bc->stats.rx_dropped++;
557 return;
558 }
559 cp = skb_put(skb, pktlen);
560 *cp++ = 0; /* KISS kludge */
561 memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
562 skb->protocol = ax25_type_trans(skb, dev);
563 netif_rx(skb);
564 dev->last_rx = jiffies;
565 bc->stats.rx_packets++;
566 }
567
568 static int receive(struct net_device *dev, int cnt)
569 {
570 struct baycom_state *bc = netdev_priv(dev);
571 struct parport *pp = bc->pdev->port;
572 unsigned int bitbuf, notbitstream, bitstream, numbits, state;
573 unsigned char tmp[128];
574 unsigned char *cp;
575 int cnt2, ret = 0;
576 int j;
577
578 numbits = bc->hdlcrx.numbits;
579 state = bc->hdlcrx.state;
580 bitstream = bc->hdlcrx.bitstream;
581 bitbuf = bc->hdlcrx.bitbuf;
582 while (cnt > 0) {
583 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
584 cnt -= cnt2;
585 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
586 ret = -1;
587 break;
588 }
589 cp = tmp;
590 for (; cnt2 > 0; cnt2--, cp++) {
591 bitstream >>= 8;
592 bitstream |= (*cp) << 8;
593 bitbuf >>= 8;
594 bitbuf |= (*cp) << 8;
595 numbits += 8;
596 notbitstream = ~bitstream;
597 for (j = 0; j < 8; j++) {
598
599 /* flag or abort */
600 if (unlikely(!(notbitstream & (0x0fc << j)))) {
601
602 /* abort received */
603 if (!(notbitstream & (0x1fc << j)))
604 state = 0;
605
606 /* not flag received */
607 else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
608 if (state)
609 do_rxpacket(dev);
610 bc->hdlcrx.bufcnt = 0;
611 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
612 state = 1;
613 numbits = 7-j;
614 }
615 }
616
617 /* stuffed bit */
618 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
619 numbits--;
620 bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
621 }
622 }
623 while (state && numbits >= 8) {
624 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
625 state = 0;
626 } else {
627 *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
628 bc->hdlcrx.bufcnt++;
629 numbits -= 8;
630 }
631 }
632 }
633 }
634 bc->hdlcrx.numbits = numbits;
635 bc->hdlcrx.state = state;
636 bc->hdlcrx.bitstream = bitstream;
637 bc->hdlcrx.bitbuf = bitbuf;
638 return ret;
639 }
640
641 /* --------------------------------------------------------------------- */
642
643 #ifdef __i386__
644 #include <asm/msr.h>
645 #define GETTICK(x) \
646 ({ \
647 if (cpu_has_tsc) \
648 rdtscl(x); \
649 })
650 #else /* __i386__ */
651 #define GETTICK(x)
652 #endif /* __i386__ */
653
654 static void epp_bh(struct work_struct *work)
655 {
656 struct net_device *dev;
657 struct baycom_state *bc;
658 struct parport *pp;
659 unsigned char stat;
660 unsigned char tmp[2];
661 unsigned int time1 = 0, time2 = 0, time3 = 0;
662 int cnt, cnt2;
663
664 bc = container_of(work, struct baycom_state, run_work.work);
665 dev = bc->dev;
666 if (!bc->work_running)
667 return;
668 baycom_int_freq(bc);
669 pp = bc->pdev->port;
670 /* update status */
671 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
672 goto epptimeout;
673 bc->stat = stat;
674 bc->debug_vals.last_pllcorr = stat;
675 GETTICK(time1);
676 if (bc->modem == EPP_FPGAEXTSTATUS) {
677 /* get input count */
678 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
679 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
680 goto epptimeout;
681 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
682 goto epptimeout;
683 cnt = tmp[0] | (tmp[1] << 8);
684 cnt &= 0x7fff;
685 /* get output count */
686 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
687 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
688 goto epptimeout;
689 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
690 goto epptimeout;
691 cnt2 = tmp[0] | (tmp[1] << 8);
692 cnt2 = 16384 - (cnt2 & 0x7fff);
693 /* return to normal */
694 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
695 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
696 goto epptimeout;
697 if (transmit(bc, cnt2, stat))
698 goto epptimeout;
699 GETTICK(time2);
700 if (receive(dev, cnt))
701 goto epptimeout;
702 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
703 goto epptimeout;
704 bc->stat = stat;
705 } else {
706 /* try to tx */
707 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
708 case EPP_NTHF:
709 cnt = 2048 - 256;
710 break;
711
712 case EPP_NTAEF:
713 cnt = 2048 - 1793;
714 break;
715
716 case 0:
717 cnt = 0;
718 break;
719
720 default:
721 cnt = 2048 - 1025;
722 break;
723 }
724 if (transmit(bc, cnt, stat))
725 goto epptimeout;
726 GETTICK(time2);
727 /* do receiver */
728 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
729 switch (stat & (EPP_NRAEF|EPP_NRHF)) {
730 case EPP_NRAEF:
731 cnt = 1025;
732 break;
733
734 case 0:
735 cnt = 1793;
736 break;
737
738 default:
739 cnt = 256;
740 break;
741 }
742 if (receive(dev, cnt))
743 goto epptimeout;
744 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
745 goto epptimeout;
746 }
747 cnt = 0;
748 if (bc->bitrate < 50000)
749 cnt = 256;
750 else if (bc->bitrate < 100000)
751 cnt = 128;
752 while (cnt > 0 && stat & EPP_NREF) {
753 if (receive(dev, 1))
754 goto epptimeout;
755 cnt--;
756 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
757 goto epptimeout;
758 }
759 }
760 GETTICK(time3);
761 #ifdef BAYCOM_DEBUG
762 bc->debug_vals.mod_cycles = time2 - time1;
763 bc->debug_vals.demod_cycles = time3 - time2;
764 #endif /* BAYCOM_DEBUG */
765 schedule_delayed_work(&bc->run_work, 1);
766 if (!bc->skb)
767 netif_wake_queue(dev);
768 return;
769 epptimeout:
770 printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
771 }
772
773 /* ---------------------------------------------------------------------- */
774 /*
775 * ===================== network driver interface =========================
776 */
777
778 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
779 {
780 struct baycom_state *bc = netdev_priv(dev);
781
782 if (skb->data[0] != 0) {
783 do_kiss_params(bc, skb->data, skb->len);
784 dev_kfree_skb(skb);
785 return 0;
786 }
787 if (bc->skb)
788 return -1;
789 /* strip KISS byte */
790 if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
791 dev_kfree_skb(skb);
792 return 0;
793 }
794 netif_stop_queue(dev);
795 bc->skb = skb;
796 return 0;
797 }
798
799 /* --------------------------------------------------------------------- */
800
801 static int baycom_set_mac_address(struct net_device *dev, void *addr)
802 {
803 struct sockaddr *sa = (struct sockaddr *)addr;
804
805 /* addr is an AX.25 shifted ASCII mac address */
806 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
807 return 0;
808 }
809
810 /* --------------------------------------------------------------------- */
811
812 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
813 {
814 struct baycom_state *bc = netdev_priv(dev);
815
816 /*
817 * Get the current statistics. This may be called with the
818 * card open or closed.
819 */
820 return &bc->stats;
821 }
822
823 /* --------------------------------------------------------------------- */
824
825 static void epp_wakeup(void *handle)
826 {
827 struct net_device *dev = (struct net_device *)handle;
828 struct baycom_state *bc = netdev_priv(dev);
829
830 printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
831 if (!parport_claim(bc->pdev))
832 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
833 }
834
835 /* --------------------------------------------------------------------- */
836
837 /*
838 * Open/initialize the board. This is called (in the current kernel)
839 * sometime after booting when the 'ifconfig' program is run.
840 *
841 * This routine should set everything up anew at each open, even
842 * registers that "should" only need to be set once at boot, so that
843 * there is non-reboot way to recover if something goes wrong.
844 */
845
846 static int epp_open(struct net_device *dev)
847 {
848 struct baycom_state *bc = netdev_priv(dev);
849 struct parport *pp = parport_find_base(dev->base_addr);
850 unsigned int i, j;
851 unsigned char tmp[128];
852 unsigned char stat;
853 unsigned long tstart;
854
855 if (!pp) {
856 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
857 return -ENXIO;
858 }
859 #if 0
860 if (pp->irq < 0) {
861 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
862 parport_put_port(pp);
863 return -ENXIO;
864 }
865 #endif
866 if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
867 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
868 bc_drvname, pp->base);
869 parport_put_port(pp);
870 return -EIO;
871 }
872 memset(&bc->modem, 0, sizeof(bc->modem));
873 bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup,
874 epp_interrupt, PARPORT_DEV_EXCL, dev);
875 parport_put_port(pp);
876 if (!bc->pdev) {
877 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
878 return -ENXIO;
879 }
880 if (parport_claim(bc->pdev)) {
881 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
882 parport_unregister_device(bc->pdev);
883 return -EBUSY;
884 }
885 dev->irq = /*pp->irq*/ 0;
886 INIT_DELAYED_WORK(&bc->run_work, epp_bh);
887 bc->work_running = 1;
888 bc->modem = EPP_CONVENTIONAL;
889 if (eppconfig(bc))
890 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
891 else
892 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
893 parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
894 /* reset the modem */
895 tmp[0] = 0;
896 tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
897 if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
898 goto epptimeout;
899 /* autoprobe baud rate */
900 tstart = jiffies;
901 i = 0;
902 while (time_before(jiffies, tstart + HZ/3)) {
903 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
904 goto epptimeout;
905 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
906 schedule();
907 continue;
908 }
909 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
910 goto epptimeout;
911 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
912 goto epptimeout;
913 i += 256;
914 }
915 for (j = 0; j < 256; j++) {
916 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
917 goto epptimeout;
918 if (!(stat & EPP_NREF))
919 break;
920 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
921 goto epptimeout;
922 i++;
923 }
924 tstart = jiffies - tstart;
925 bc->bitrate = i * (8 * HZ) / tstart;
926 j = 1;
927 i = bc->bitrate >> 3;
928 while (j < 7 && i > 150) {
929 j++;
930 i >>= 1;
931 }
932 printk(KERN_INFO "%s: autoprobed bitrate: %d int divider: %d int rate: %d\n",
933 bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
934 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
935 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
936 goto epptimeout;
937 /*
938 * initialise hdlc variables
939 */
940 bc->hdlcrx.state = 0;
941 bc->hdlcrx.numbits = 0;
942 bc->hdlctx.state = tx_idle;
943 bc->hdlctx.bufcnt = 0;
944 bc->hdlctx.slotcnt = bc->ch_params.slottime;
945 bc->hdlctx.calibrate = 0;
946 /* start the bottom half stuff */
947 schedule_delayed_work(&bc->run_work, 1);
948 netif_start_queue(dev);
949 return 0;
950
951 epptimeout:
952 printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
953 parport_write_control(pp, 0); /* reset the adapter */
954 parport_release(bc->pdev);
955 parport_unregister_device(bc->pdev);
956 return -EIO;
957 }
958
959 /* --------------------------------------------------------------------- */
960
961 static int epp_close(struct net_device *dev)
962 {
963 struct baycom_state *bc = netdev_priv(dev);
964 struct parport *pp = bc->pdev->port;
965 unsigned char tmp[1];
966
967 bc->work_running = 0;
968 flush_scheduled_work();
969 bc->stat = EPP_DCDBIT;
970 tmp[0] = 0;
971 pp->ops->epp_write_addr(pp, tmp, 1, 0);
972 parport_write_control(pp, 0); /* reset the adapter */
973 parport_release(bc->pdev);
974 parport_unregister_device(bc->pdev);
975 if (bc->skb)
976 dev_kfree_skb(bc->skb);
977 bc->skb = NULL;
978 printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
979 bc_drvname, dev->base_addr, dev->irq);
980 return 0;
981 }
982
983 /* --------------------------------------------------------------------- */
984
985 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
986 {
987 const char *cp;
988
989 if (strstr(modestr,"intclk"))
990 bc->cfg.intclk = 1;
991 if (strstr(modestr,"extclk"))
992 bc->cfg.intclk = 0;
993 if (strstr(modestr,"intmodem"))
994 bc->cfg.extmodem = 0;
995 if (strstr(modestr,"extmodem"))
996 bc->cfg.extmodem = 1;
997 if (strstr(modestr,"noloopback"))
998 bc->cfg.loopback = 0;
999 if (strstr(modestr,"loopback"))
1000 bc->cfg.loopback = 1;
1001 if ((cp = strstr(modestr,"fclk="))) {
1002 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1003 if (bc->cfg.fclk < 1000000)
1004 bc->cfg.fclk = 1000000;
1005 if (bc->cfg.fclk > 25000000)
1006 bc->cfg.fclk = 25000000;
1007 }
1008 if ((cp = strstr(modestr,"bps="))) {
1009 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1010 if (bc->cfg.bps < 1000)
1011 bc->cfg.bps = 1000;
1012 if (bc->cfg.bps > 1500000)
1013 bc->cfg.bps = 1500000;
1014 }
1015 return 0;
1016 }
1017
1018 /* --------------------------------------------------------------------- */
1019
1020 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1021 {
1022 struct baycom_state *bc = netdev_priv(dev);
1023 struct hdlcdrv_ioctl hi;
1024
1025 if (cmd != SIOCDEVPRIVATE)
1026 return -ENOIOCTLCMD;
1027
1028 if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1029 return -EFAULT;
1030 switch (hi.cmd) {
1031 default:
1032 return -ENOIOCTLCMD;
1033
1034 case HDLCDRVCTL_GETCHANNELPAR:
1035 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1036 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1037 hi.data.cp.slottime = bc->ch_params.slottime;
1038 hi.data.cp.ppersist = bc->ch_params.ppersist;
1039 hi.data.cp.fulldup = bc->ch_params.fulldup;
1040 break;
1041
1042 case HDLCDRVCTL_SETCHANNELPAR:
1043 if (!capable(CAP_NET_ADMIN))
1044 return -EACCES;
1045 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1046 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1047 bc->ch_params.slottime = hi.data.cp.slottime;
1048 bc->ch_params.ppersist = hi.data.cp.ppersist;
1049 bc->ch_params.fulldup = hi.data.cp.fulldup;
1050 bc->hdlctx.slotcnt = 1;
1051 return 0;
1052
1053 case HDLCDRVCTL_GETMODEMPAR:
1054 hi.data.mp.iobase = dev->base_addr;
1055 hi.data.mp.irq = dev->irq;
1056 hi.data.mp.dma = dev->dma;
1057 hi.data.mp.dma2 = 0;
1058 hi.data.mp.seriobase = 0;
1059 hi.data.mp.pariobase = 0;
1060 hi.data.mp.midiiobase = 0;
1061 break;
1062
1063 case HDLCDRVCTL_SETMODEMPAR:
1064 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1065 return -EACCES;
1066 dev->base_addr = hi.data.mp.iobase;
1067 dev->irq = /*hi.data.mp.irq*/0;
1068 dev->dma = /*hi.data.mp.dma*/0;
1069 return 0;
1070
1071 case HDLCDRVCTL_GETSTAT:
1072 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1073 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1074 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1075 hi.data.cs.tx_packets = bc->stats.tx_packets;
1076 hi.data.cs.tx_errors = bc->stats.tx_errors;
1077 hi.data.cs.rx_packets = bc->stats.rx_packets;
1078 hi.data.cs.rx_errors = bc->stats.rx_errors;
1079 break;
1080
1081 case HDLCDRVCTL_OLDGETSTAT:
1082 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1083 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1084 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1085 break;
1086
1087 case HDLCDRVCTL_CALIBRATE:
1088 if (!capable(CAP_SYS_RAWIO))
1089 return -EACCES;
1090 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1091 return 0;
1092
1093 case HDLCDRVCTL_DRIVERNAME:
1094 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1095 break;
1096
1097 case HDLCDRVCTL_GETMODE:
1098 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s",
1099 bc->cfg.intclk ? "int" : "ext",
1100 bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1101 bc->cfg.loopback ? ",loopback" : "");
1102 break;
1103
1104 case HDLCDRVCTL_SETMODE:
1105 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1106 return -EACCES;
1107 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1108 return baycom_setmode(bc, hi.data.modename);
1109
1110 case HDLCDRVCTL_MODELIST:
1111 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1112 sizeof(hi.data.modename));
1113 break;
1114
1115 case HDLCDRVCTL_MODEMPARMASK:
1116 return HDLCDRV_PARMASK_IOBASE;
1117
1118 }
1119 if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1120 return -EFAULT;
1121 return 0;
1122 }
1123
1124 /* --------------------------------------------------------------------- */
1125
1126 /*
1127 * Check for a network adaptor of this type, and return '0' if one exists.
1128 * If dev->base_addr == 0, probe all likely locations.
1129 * If dev->base_addr == 1, always return failure.
1130 * If dev->base_addr == 2, allocate space for the device and return success
1131 * (detachable devices only).
1132 */
1133 static void baycom_probe(struct net_device *dev)
1134 {
1135 const struct hdlcdrv_channel_params dflt_ch_params = {
1136 20, 2, 10, 40, 0
1137 };
1138 struct baycom_state *bc;
1139
1140 /*
1141 * not a real probe! only initialize data structures
1142 */
1143 bc = netdev_priv(dev);
1144 /*
1145 * initialize the baycom_state struct
1146 */
1147 bc->ch_params = dflt_ch_params;
1148 bc->ptt_keyed = 0;
1149
1150 /*
1151 * initialize the device struct
1152 */
1153 dev->open = epp_open;
1154 dev->stop = epp_close;
1155 dev->do_ioctl = baycom_ioctl;
1156 dev->hard_start_xmit = baycom_send_packet;
1157 dev->get_stats = baycom_get_stats;
1158
1159 /* Fill in the fields of the device structure */
1160 bc->skb = NULL;
1161
1162 dev->hard_header = ax25_hard_header;
1163 dev->rebuild_header = ax25_rebuild_header;
1164 dev->set_mac_address = baycom_set_mac_address;
1165
1166 dev->type = ARPHRD_AX25; /* AF_AX25 device */
1167 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1168 dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
1169 dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
1170 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1171 memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1172 dev->tx_queue_len = 16;
1173
1174 /* New style flags */
1175 dev->flags = 0;
1176 }
1177
1178 /* --------------------------------------------------------------------- */
1179
1180 /*
1181 * command line settable parameters
1182 */
1183 static const char *mode[NR_PORTS] = { "", };
1184 static int iobase[NR_PORTS] = { 0x378, };
1185
1186 module_param_array(mode, charp, NULL, 0);
1187 MODULE_PARM_DESC(mode, "baycom operating mode");
1188 module_param_array(iobase, int, NULL, 0);
1189 MODULE_PARM_DESC(iobase, "baycom io base address");
1190
1191 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1192 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1193 MODULE_LICENSE("GPL");
1194
1195 /* --------------------------------------------------------------------- */
1196
1197 static void __init baycom_epp_dev_setup(struct net_device *dev)
1198 {
1199 struct baycom_state *bc = netdev_priv(dev);
1200
1201 /*
1202 * initialize part of the baycom_state struct
1203 */
1204 bc->dev = dev;
1205 bc->magic = BAYCOM_MAGIC;
1206 bc->cfg.fclk = 19666600;
1207 bc->cfg.bps = 9600;
1208 /*
1209 * initialize part of the device struct
1210 */
1211 baycom_probe(dev);
1212 }
1213
1214 static int __init init_baycomepp(void)
1215 {
1216 int i, found = 0;
1217 char set_hw = 1;
1218
1219 printk(bc_drvinfo);
1220 /*
1221 * register net devices
1222 */
1223 for (i = 0; i < NR_PORTS; i++) {
1224 struct net_device *dev;
1225
1226 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1227 baycom_epp_dev_setup);
1228
1229 if (!dev) {
1230 printk(KERN_WARNING "bce%d : out of memory\n", i);
1231 return found ? 0 : -ENOMEM;
1232 }
1233
1234 sprintf(dev->name, "bce%d", i);
1235 dev->base_addr = iobase[i];
1236
1237 if (!mode[i])
1238 set_hw = 0;
1239 if (!set_hw)
1240 iobase[i] = 0;
1241
1242 if (register_netdev(dev)) {
1243 printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1244 free_netdev(dev);
1245 break;
1246 }
1247 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1248 set_hw = 0;
1249 baycom_device[i] = dev;
1250 found++;
1251 }
1252
1253 return found ? 0 : -ENXIO;
1254 }
1255
1256 static void __exit cleanup_baycomepp(void)
1257 {
1258 int i;
1259
1260 for(i = 0; i < NR_PORTS; i++) {
1261 struct net_device *dev = baycom_device[i];
1262
1263 if (dev) {
1264 struct baycom_state *bc = netdev_priv(dev);
1265 if (bc->magic == BAYCOM_MAGIC) {
1266 unregister_netdev(dev);
1267 free_netdev(dev);
1268 } else
1269 printk(paranoia_str, "cleanup_module");
1270 }
1271 }
1272 }
1273
1274 module_init(init_baycomepp);
1275 module_exit(cleanup_baycomepp);
1276
1277 /* --------------------------------------------------------------------- */
1278
1279 #ifndef MODULE
1280
1281 /*
1282 * format: baycom_epp=io,mode
1283 * mode: fpga config options
1284 */
1285
1286 static int __init baycom_epp_setup(char *str)
1287 {
1288 static unsigned __initdata nr_dev = 0;
1289 int ints[2];
1290
1291 if (nr_dev >= NR_PORTS)
1292 return 0;
1293 str = get_options(str, 2, ints);
1294 if (ints[0] < 1)
1295 return 0;
1296 mode[nr_dev] = str;
1297 iobase[nr_dev] = ints[1];
1298 nr_dev++;
1299 return 1;
1300 }
1301
1302 __setup("baycom_epp=", baycom_epp_setup);
1303
1304 #endif /* MODULE */
1305 /* --------------------------------------------------------------------- */
WandBoard kernel