[PARPORT] Remove unused 'irq' argument from parport irq functions
[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/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, 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->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                 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         dev->last_rx = jiffies;
559         bc->stats.rx_packets++;
560 }
561
562 static int receive(struct net_device *dev, int cnt)
563 {
564         struct baycom_state *bc = netdev_priv(dev);
565         struct parport *pp = bc->pdev->port;
566         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
567         unsigned char tmp[128];
568         unsigned char *cp;
569         int cnt2, ret = 0;
570         int j;
571         
572         numbits = bc->hdlcrx.numbits;
573         state = bc->hdlcrx.state;
574         bitstream = bc->hdlcrx.bitstream;
575         bitbuf = bc->hdlcrx.bitbuf;
576         while (cnt > 0) {
577                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
578                 cnt -= cnt2;
579                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
580                         ret = -1;
581                         break;
582                 }
583                 cp = tmp;
584                 for (; cnt2 > 0; cnt2--, cp++) {
585                         bitstream >>= 8;
586                         bitstream |= (*cp) << 8;
587                         bitbuf >>= 8;
588                         bitbuf |= (*cp) << 8;
589                         numbits += 8;
590                         notbitstream = ~bitstream;
591                         for (j = 0; j < 8; j++) {
592
593                                 /* flag or abort */
594                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
595
596                                         /* abort received */
597                                         if (!(notbitstream & (0x1fc << j)))
598                                                 state = 0;
599
600                                         /* not flag received */
601                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
602                                                 if (state)
603                                                         do_rxpacket(dev);
604                                                 bc->hdlcrx.bufcnt = 0;
605                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
606                                                 state = 1;
607                                                 numbits = 7-j;
608                                                 }
609                                         }
610
611                                 /* stuffed bit */
612                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
613                                         numbits--;
614                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
615                                         }
616                                 }
617                         while (state && numbits >= 8) {
618                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
619                                         state = 0;
620                                 } else {
621                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
622                                         bc->hdlcrx.bufcnt++;
623                                         numbits -= 8;
624                                 }
625                         }
626                 }
627         }
628         bc->hdlcrx.numbits = numbits;
629         bc->hdlcrx.state = state;
630         bc->hdlcrx.bitstream = bitstream;
631         bc->hdlcrx.bitbuf = bitbuf;
632         return ret;
633 }
634
635 /* --------------------------------------------------------------------- */
636
637 #ifdef __i386__
638 #include <asm/msr.h>
639 #define GETTICK(x)                                                \
640 ({                                                                \
641         if (cpu_has_tsc)                                          \
642                 rdtscl(x);                                        \
643 })
644 #else /* __i386__ */
645 #define GETTICK(x)
646 #endif /* __i386__ */
647
648 static void epp_bh(struct work_struct *work)
649 {
650         struct net_device *dev;
651         struct baycom_state *bc;
652         struct parport *pp;
653         unsigned char stat;
654         unsigned char tmp[2];
655         unsigned int time1 = 0, time2 = 0, time3 = 0;
656         int cnt, cnt2;
657
658         bc = container_of(work, struct baycom_state, run_work.work);
659         dev = bc->dev;
660         if (!bc->work_running)
661                 return;
662         baycom_int_freq(bc);
663         pp = bc->pdev->port;
664         /* update status */
665         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
666                 goto epptimeout;
667         bc->stat = stat;
668         bc->debug_vals.last_pllcorr = stat;
669         GETTICK(time1);
670         if (bc->modem == EPP_FPGAEXTSTATUS) {
671                 /* get input count */
672                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
673                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
674                         goto epptimeout;
675                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
676                         goto epptimeout;
677                 cnt = tmp[0] | (tmp[1] << 8);
678                 cnt &= 0x7fff;
679                 /* get output count */
680                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
681                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
682                         goto epptimeout;
683                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
684                         goto epptimeout;
685                 cnt2 = tmp[0] | (tmp[1] << 8);
686                 cnt2 = 16384 - (cnt2 & 0x7fff);
687                 /* return to normal */
688                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
689                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
690                         goto epptimeout;
691                 if (transmit(bc, cnt2, stat))
692                         goto epptimeout;
693                 GETTICK(time2);
694                 if (receive(dev, cnt))
695                         goto epptimeout;
696                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
697                         goto epptimeout;
698                 bc->stat = stat;
699         } else {
700                 /* try to tx */
701                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
702                 case EPP_NTHF:
703                         cnt = 2048 - 256;
704                         break;
705                 
706                 case EPP_NTAEF:
707                         cnt = 2048 - 1793;
708                         break;
709                 
710                 case 0:
711                         cnt = 0;
712                         break;
713                 
714                 default:
715                         cnt = 2048 - 1025;
716                         break;
717                 }
718                 if (transmit(bc, cnt, stat))
719                         goto epptimeout;
720                 GETTICK(time2);
721                 /* do receiver */
722                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
723                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
724                         case EPP_NRAEF:
725                                 cnt = 1025;
726                                 break;
727
728                         case 0:
729                                 cnt = 1793;
730                                 break;
731
732                         default:
733                                 cnt = 256;
734                                 break;
735                         }
736                         if (receive(dev, cnt))
737                                 goto epptimeout;
738                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
739                                 goto epptimeout;
740                 }
741                 cnt = 0;
742                 if (bc->bitrate < 50000)
743                         cnt = 256;
744                 else if (bc->bitrate < 100000)
745                         cnt = 128;
746                 while (cnt > 0 && stat & EPP_NREF) {
747                         if (receive(dev, 1))
748                                 goto epptimeout;
749                         cnt--;
750                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
751                                 goto epptimeout;
752                 }
753         }
754         GETTICK(time3);
755 #ifdef BAYCOM_DEBUG
756         bc->debug_vals.mod_cycles = time2 - time1;
757         bc->debug_vals.demod_cycles = time3 - time2;
758 #endif /* BAYCOM_DEBUG */
759         schedule_delayed_work(&bc->run_work, 1);
760         if (!bc->skb)
761                 netif_wake_queue(dev);
762         return;
763  epptimeout:
764         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
765 }
766
767 /* ---------------------------------------------------------------------- */
768 /*
769  * ===================== network driver interface =========================
770  */
771
772 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
773 {
774         struct baycom_state *bc = netdev_priv(dev);
775
776         if (skb->data[0] != 0) {
777                 do_kiss_params(bc, skb->data, skb->len);
778                 dev_kfree_skb(skb);
779                 return 0;
780         }
781         if (bc->skb)
782                 return -1;
783         /* strip KISS byte */
784         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
785                 dev_kfree_skb(skb);
786                 return 0;
787         }
788         netif_stop_queue(dev);
789         bc->skb = skb;
790         return 0;
791 }
792
793 /* --------------------------------------------------------------------- */
794
795 static int baycom_set_mac_address(struct net_device *dev, void *addr)
796 {
797         struct sockaddr *sa = (struct sockaddr *)addr;
798
799         /* addr is an AX.25 shifted ASCII mac address */
800         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 
801         return 0;                                         
802 }
803
804 /* --------------------------------------------------------------------- */
805
806 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
807 {
808         struct baycom_state *bc = netdev_priv(dev);
809
810         /* 
811          * Get the current statistics.  This may be called with the
812          * card open or closed. 
813          */
814         return &bc->stats;
815 }
816
817 /* --------------------------------------------------------------------- */
818
819 static void epp_wakeup(void *handle)
820 {
821         struct net_device *dev = (struct net_device *)handle;
822         struct baycom_state *bc = netdev_priv(dev);
823
824         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
825         if (!parport_claim(bc->pdev))
826                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
827 }
828
829 /* --------------------------------------------------------------------- */
830
831 /*
832  * Open/initialize the board. This is called (in the current kernel)
833  * sometime after booting when the 'ifconfig' program is run.
834  *
835  * This routine should set everything up anew at each open, even
836  * registers that "should" only need to be set once at boot, so that
837  * there is non-reboot way to recover if something goes wrong.
838  */
839
840 static int epp_open(struct net_device *dev)
841 {
842         struct baycom_state *bc = netdev_priv(dev);
843         struct parport *pp = parport_find_base(dev->base_addr);
844         unsigned int i, j;
845         unsigned char tmp[128];
846         unsigned char stat;
847         unsigned long tstart;
848         
849         if (!pp) {
850                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
851                 return -ENXIO;
852         }
853 #if 0
854         if (pp->irq < 0) {
855                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
856                 parport_put_port(pp);
857                 return -ENXIO;
858         }
859 #endif
860         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
861                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
862                        bc_drvname, pp->base);
863                 parport_put_port(pp);
864                 return -EIO;
865         }
866         memset(&bc->modem, 0, sizeof(bc->modem));
867         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup, 
868                                            NULL, PARPORT_DEV_EXCL, dev);
869         parport_put_port(pp);
870         if (!bc->pdev) {
871                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
872                 return -ENXIO;
873         }
874         if (parport_claim(bc->pdev)) {
875                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
876                 parport_unregister_device(bc->pdev);
877                 return -EBUSY;
878         }
879         dev->irq = /*pp->irq*/ 0;
880         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
881         bc->work_running = 1;
882         bc->modem = EPP_CONVENTIONAL;
883         if (eppconfig(bc))
884                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
885         else
886                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
887         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
888         /* reset the modem */
889         tmp[0] = 0;
890         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
891         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
892                 goto epptimeout;
893         /* autoprobe baud rate */
894         tstart = jiffies;
895         i = 0;
896         while (time_before(jiffies, tstart + HZ/3)) {
897                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
898                         goto epptimeout;
899                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
900                         schedule();
901                         continue;
902                 }
903                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
904                         goto epptimeout;
905                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
906                         goto epptimeout;
907                 i += 256;
908         }
909         for (j = 0; j < 256; j++) {
910                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
911                         goto epptimeout;
912                 if (!(stat & EPP_NREF))
913                         break;
914                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
915                         goto epptimeout;
916                 i++;
917         }
918         tstart = jiffies - tstart;
919         bc->bitrate = i * (8 * HZ) / tstart;
920         j = 1;
921         i = bc->bitrate >> 3;
922         while (j < 7 && i > 150) {
923                 j++;
924                 i >>= 1;
925         }
926         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n", 
927                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
928         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
929         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
930                 goto epptimeout;
931         /*
932          * initialise hdlc variables
933          */
934         bc->hdlcrx.state = 0;
935         bc->hdlcrx.numbits = 0;
936         bc->hdlctx.state = tx_idle;
937         bc->hdlctx.bufcnt = 0;
938         bc->hdlctx.slotcnt = bc->ch_params.slottime;
939         bc->hdlctx.calibrate = 0;
940         /* start the bottom half stuff */
941         schedule_delayed_work(&bc->run_work, 1);
942         netif_start_queue(dev);
943         return 0;
944
945  epptimeout:
946         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
947         parport_write_control(pp, 0); /* reset the adapter */
948         parport_release(bc->pdev);
949         parport_unregister_device(bc->pdev);
950         return -EIO;
951 }
952
953 /* --------------------------------------------------------------------- */
954
955 static int epp_close(struct net_device *dev)
956 {
957         struct baycom_state *bc = netdev_priv(dev);
958         struct parport *pp = bc->pdev->port;
959         unsigned char tmp[1];
960
961         bc->work_running = 0;
962         flush_scheduled_work();
963         bc->stat = EPP_DCDBIT;
964         tmp[0] = 0;
965         pp->ops->epp_write_addr(pp, tmp, 1, 0);
966         parport_write_control(pp, 0); /* reset the adapter */
967         parport_release(bc->pdev);
968         parport_unregister_device(bc->pdev);
969         if (bc->skb)
970                 dev_kfree_skb(bc->skb);
971         bc->skb = NULL;
972         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
973                bc_drvname, dev->base_addr, dev->irq);
974         return 0;
975 }
976
977 /* --------------------------------------------------------------------- */
978
979 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
980 {
981         const char *cp;
982
983         if (strstr(modestr,"intclk"))
984                 bc->cfg.intclk = 1;
985         if (strstr(modestr,"extclk"))
986                 bc->cfg.intclk = 0;
987         if (strstr(modestr,"intmodem"))
988                 bc->cfg.extmodem = 0;
989         if (strstr(modestr,"extmodem"))
990                 bc->cfg.extmodem = 1;
991         if (strstr(modestr,"noloopback"))
992                 bc->cfg.loopback = 0;
993         if (strstr(modestr,"loopback"))
994                 bc->cfg.loopback = 1;
995         if ((cp = strstr(modestr,"fclk="))) {
996                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
997                 if (bc->cfg.fclk < 1000000)
998                         bc->cfg.fclk = 1000000;
999                 if (bc->cfg.fclk > 25000000)
1000                         bc->cfg.fclk = 25000000;
1001         }
1002         if ((cp = strstr(modestr,"bps="))) {
1003                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1004                 if (bc->cfg.bps < 1000)
1005                         bc->cfg.bps = 1000;
1006                 if (bc->cfg.bps > 1500000)
1007                         bc->cfg.bps = 1500000;
1008         }
1009         return 0;
1010 }
1011
1012 /* --------------------------------------------------------------------- */
1013
1014 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1015 {
1016         struct baycom_state *bc = netdev_priv(dev);
1017         struct hdlcdrv_ioctl hi;
1018
1019         if (cmd != SIOCDEVPRIVATE)
1020                 return -ENOIOCTLCMD;
1021
1022         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1023                 return -EFAULT;
1024         switch (hi.cmd) {
1025         default:
1026                 return -ENOIOCTLCMD;
1027
1028         case HDLCDRVCTL_GETCHANNELPAR:
1029                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1030                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1031                 hi.data.cp.slottime = bc->ch_params.slottime;
1032                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1033                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1034                 break;
1035
1036         case HDLCDRVCTL_SETCHANNELPAR:
1037                 if (!capable(CAP_NET_ADMIN))
1038                         return -EACCES;
1039                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1040                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1041                 bc->ch_params.slottime = hi.data.cp.slottime;
1042                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1043                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1044                 bc->hdlctx.slotcnt = 1;
1045                 return 0;
1046                 
1047         case HDLCDRVCTL_GETMODEMPAR:
1048                 hi.data.mp.iobase = dev->base_addr;
1049                 hi.data.mp.irq = dev->irq;
1050                 hi.data.mp.dma = dev->dma;
1051                 hi.data.mp.dma2 = 0;
1052                 hi.data.mp.seriobase = 0;
1053                 hi.data.mp.pariobase = 0;
1054                 hi.data.mp.midiiobase = 0;
1055                 break;
1056
1057         case HDLCDRVCTL_SETMODEMPAR:
1058                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1059                         return -EACCES;
1060                 dev->base_addr = hi.data.mp.iobase;
1061                 dev->irq = /*hi.data.mp.irq*/0;
1062                 dev->dma = /*hi.data.mp.dma*/0;
1063                 return 0;       
1064                 
1065         case HDLCDRVCTL_GETSTAT:
1066                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1067                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1068                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1069                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1070                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1071                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1072                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1073                 break;          
1074
1075         case HDLCDRVCTL_OLDGETSTAT:
1076                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1077                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1078                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1079                 break;          
1080
1081         case HDLCDRVCTL_CALIBRATE:
1082                 if (!capable(CAP_SYS_RAWIO))
1083                         return -EACCES;
1084                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1085                 return 0;
1086
1087         case HDLCDRVCTL_DRIVERNAME:
1088                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1089                 break;
1090                 
1091         case HDLCDRVCTL_GETMODE:
1092                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s", 
1093                         bc->cfg.intclk ? "int" : "ext",
1094                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1095                         bc->cfg.loopback ? ",loopback" : "");
1096                 break;
1097
1098         case HDLCDRVCTL_SETMODE:
1099                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1100                         return -EACCES;
1101                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1102                 return baycom_setmode(bc, hi.data.modename);
1103
1104         case HDLCDRVCTL_MODELIST:
1105                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1106                         sizeof(hi.data.modename));
1107                 break;
1108
1109         case HDLCDRVCTL_MODEMPARMASK:
1110                 return HDLCDRV_PARMASK_IOBASE;
1111
1112         }
1113         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1114                 return -EFAULT;
1115         return 0;
1116 }
1117
1118 /* --------------------------------------------------------------------- */
1119
1120 /*
1121  * Check for a network adaptor of this type, and return '0' if one exists.
1122  * If dev->base_addr == 0, probe all likely locations.
1123  * If dev->base_addr == 1, always return failure.
1124  * If dev->base_addr == 2, allocate space for the device and return success
1125  * (detachable devices only).
1126  */
1127 static void baycom_probe(struct net_device *dev)
1128 {
1129         const struct hdlcdrv_channel_params dflt_ch_params = { 
1130                 20, 2, 10, 40, 0 
1131         };
1132         struct baycom_state *bc;
1133
1134         /*
1135          * not a real probe! only initialize data structures
1136          */
1137         bc = netdev_priv(dev);
1138         /*
1139          * initialize the baycom_state struct
1140          */
1141         bc->ch_params = dflt_ch_params;
1142         bc->ptt_keyed = 0;
1143
1144         /*
1145          * initialize the device struct
1146          */
1147         dev->open = epp_open;
1148         dev->stop = epp_close;
1149         dev->do_ioctl = baycom_ioctl;
1150         dev->hard_start_xmit = baycom_send_packet;
1151         dev->get_stats = baycom_get_stats;
1152
1153         /* Fill in the fields of the device structure */
1154         bc->skb = NULL;
1155         
1156         dev->header_ops = &ax25_header_ops;
1157         dev->set_mac_address = baycom_set_mac_address;
1158         
1159         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1160         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1161         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1162         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1163         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1164         memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1165         dev->tx_queue_len = 16;
1166
1167         /* New style flags */
1168         dev->flags = 0;
1169 }
1170
1171 /* --------------------------------------------------------------------- */
1172
1173 /*
1174  * command line settable parameters
1175  */
1176 static const char *mode[NR_PORTS] = { "", };
1177 static int iobase[NR_PORTS] = { 0x378, };
1178
1179 module_param_array(mode, charp, NULL, 0);
1180 MODULE_PARM_DESC(mode, "baycom operating mode");
1181 module_param_array(iobase, int, NULL, 0);
1182 MODULE_PARM_DESC(iobase, "baycom io base address");
1183
1184 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1185 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1186 MODULE_LICENSE("GPL");
1187
1188 /* --------------------------------------------------------------------- */
1189
1190 static void __init baycom_epp_dev_setup(struct net_device *dev)
1191 {
1192         struct baycom_state *bc = netdev_priv(dev);
1193
1194         /*
1195          * initialize part of the baycom_state struct
1196          */
1197         bc->dev = dev;
1198         bc->magic = BAYCOM_MAGIC;
1199         bc->cfg.fclk = 19666600;
1200         bc->cfg.bps = 9600;
1201         /*
1202          * initialize part of the device struct
1203          */
1204         baycom_probe(dev);
1205 }
1206
1207 static int __init init_baycomepp(void)
1208 {
1209         int i, found = 0;
1210         char set_hw = 1;
1211
1212         printk(bc_drvinfo);
1213         /*
1214          * register net devices
1215          */
1216         for (i = 0; i < NR_PORTS; i++) {
1217                 struct net_device *dev;
1218                 
1219                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1220                                    baycom_epp_dev_setup);
1221
1222                 if (!dev) {
1223                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1224                         return found ? 0 : -ENOMEM;
1225                 }
1226                         
1227                 sprintf(dev->name, "bce%d", i);
1228                 dev->base_addr = iobase[i];
1229
1230                 if (!mode[i])
1231                         set_hw = 0;
1232                 if (!set_hw)
1233                         iobase[i] = 0;
1234
1235                 if (register_netdev(dev)) {
1236                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1237                         free_netdev(dev);
1238                         break;
1239                 }
1240                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1241                         set_hw = 0;
1242                 baycom_device[i] = dev;
1243                 found++;
1244         }
1245
1246         return found ? 0 : -ENXIO;
1247 }
1248
1249 static void __exit cleanup_baycomepp(void)
1250 {
1251         int i;
1252
1253         for(i = 0; i < NR_PORTS; i++) {
1254                 struct net_device *dev = baycom_device[i];
1255
1256                 if (dev) {
1257                         struct baycom_state *bc = netdev_priv(dev);
1258                         if (bc->magic == BAYCOM_MAGIC) {
1259                                 unregister_netdev(dev);
1260                                 free_netdev(dev);
1261                         } else
1262                                 printk(paranoia_str, "cleanup_module");
1263                 }
1264         }
1265 }
1266
1267 module_init(init_baycomepp);
1268 module_exit(cleanup_baycomepp);
1269
1270 /* --------------------------------------------------------------------- */
1271
1272 #ifndef MODULE
1273
1274 /*
1275  * format: baycom_epp=io,mode
1276  * mode: fpga config options
1277  */
1278
1279 static int __init baycom_epp_setup(char *str)
1280 {
1281         static unsigned __initdata nr_dev = 0;
1282         int ints[2];
1283
1284         if (nr_dev >= NR_PORTS)
1285                 return 0;
1286         str = get_options(str, 2, ints);
1287         if (ints[0] < 1)
1288                 return 0;
1289         mode[nr_dev] = str;
1290         iobase[nr_dev] = ints[1];
1291         nr_dev++;
1292         return 1;
1293 }
1294
1295 __setup("baycom_epp=", baycom_epp_setup);
1296
1297 #endif /* MODULE */
1298 /* --------------------------------------------------------------------- */