Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
[linux-2.6.git] / drivers / net / hamradio / baycom_epp.c
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 compiled " __TIME__ " " __DATE__ "\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 const 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 /* --------------------------------------------------------------------- */