1a5a75acf73e4a0609bf6ecf52515496318e47f8
[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 void epp_interrupt(int irq, void *dev_id)
329 {
330 }
331
332 /* ---------------------------------------------------------------------- */
333
334 static inline void do_kiss_params(struct baycom_state *bc,
335                                   unsigned char *data, unsigned long len)
336 {
337
338 #ifdef KISS_VERBOSE
339 #define PKP(a,b) printk(KERN_INFO "baycomm_epp: channel params: " a "\n", b)
340 #else /* KISS_VERBOSE */              
341 #define PKP(a,b) 
342 #endif /* KISS_VERBOSE */             
343
344         if (len < 2)
345                 return;
346         switch(data[0]) {
347         case PARAM_TXDELAY:
348                 bc->ch_params.tx_delay = data[1];
349                 PKP("TX delay = %ums", 10 * bc->ch_params.tx_delay);
350                 break;
351         case PARAM_PERSIST:   
352                 bc->ch_params.ppersist = data[1];
353                 PKP("p persistence = %u", bc->ch_params.ppersist);
354                 break;
355         case PARAM_SLOTTIME:  
356                 bc->ch_params.slottime = data[1];
357                 PKP("slot time = %ums", bc->ch_params.slottime);
358                 break;
359         case PARAM_TXTAIL:    
360                 bc->ch_params.tx_tail = data[1];
361                 PKP("TX tail = %ums", bc->ch_params.tx_tail);
362                 break;
363         case PARAM_FULLDUP:   
364                 bc->ch_params.fulldup = !!data[1];
365                 PKP("%s duplex", bc->ch_params.fulldup ? "full" : "half");
366                 break;
367         default:
368                 break;
369         }
370 #undef PKP
371 }
372
373 /* --------------------------------------------------------------------- */
374
375 static void encode_hdlc(struct baycom_state *bc)
376 {
377         struct sk_buff *skb;
378         unsigned char *wp, *bp;
379         int pkt_len;
380         unsigned bitstream, notbitstream, bitbuf, numbit, crc;
381         unsigned char crcarr[2];
382         int j;
383         
384         if (bc->hdlctx.bufcnt > 0)
385                 return;
386         skb = bc->skb;
387         if (!skb)
388                 return;
389         bc->skb = NULL;
390         pkt_len = skb->len-1; /* strip KISS byte */
391         wp = bc->hdlctx.buf;
392         bp = skb->data+1;
393         crc = calc_crc_ccitt(bp, pkt_len);
394         crcarr[0] = crc;
395         crcarr[1] = crc >> 8;
396         *wp++ = 0x7e;
397         bitstream = bitbuf = numbit = 0;
398         while (pkt_len > -2) {
399                 bitstream >>= 8;
400                 bitstream |= ((unsigned int)*bp) << 8;
401                 bitbuf |= ((unsigned int)*bp) << numbit;
402                 notbitstream = ~bitstream;
403                 bp++;
404                 pkt_len--;
405                 if (!pkt_len)
406                         bp = crcarr;
407                 for (j = 0; j < 8; j++)
408                         if (unlikely(!(notbitstream & (0x1f0 << j)))) {
409                                 bitstream &= ~(0x100 << j);
410                                 bitbuf = (bitbuf & (((2 << j) << numbit) - 1)) |
411                                         ((bitbuf & ~(((2 << j) << numbit) - 1)) << 1);
412                                 numbit++;
413                                 notbitstream = ~bitstream;
414                         }
415                 numbit += 8;
416                 while (numbit >= 8) {
417                         *wp++ = bitbuf;
418                         bitbuf >>= 8;
419                         numbit -= 8;
420                 }
421         }
422         bitbuf |= 0x7e7e << numbit;
423         numbit += 16;
424         while (numbit >= 8) {
425                 *wp++ = bitbuf;
426                 bitbuf >>= 8;
427                 numbit -= 8;
428         }
429         bc->hdlctx.bufptr = bc->hdlctx.buf;
430         bc->hdlctx.bufcnt = wp - bc->hdlctx.buf;
431         dev_kfree_skb(skb);
432         bc->stats.tx_packets++;
433 }
434
435 /* ---------------------------------------------------------------------- */
436
437 static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
438 {
439         struct parport *pp = bc->pdev->port;
440         unsigned char tmp[128];
441         int i, j;
442
443         if (bc->hdlctx.state == tx_tail && !(stat & EPP_PTTBIT))
444                 bc->hdlctx.state = tx_idle;
445         if (bc->hdlctx.state == tx_idle && bc->hdlctx.calibrate <= 0) {
446                 if (bc->hdlctx.bufcnt <= 0)
447                         encode_hdlc(bc);
448                 if (bc->hdlctx.bufcnt <= 0)
449                         return 0;
450                 if (!bc->ch_params.fulldup) {
451                         if (!(stat & EPP_DCDBIT)) {
452                                 bc->hdlctx.slotcnt = bc->ch_params.slottime;
453                                 return 0;
454                         }
455                         if ((--bc->hdlctx.slotcnt) > 0)
456                                 return 0;
457                         bc->hdlctx.slotcnt = bc->ch_params.slottime;
458                         if ((random32() % 256) > bc->ch_params.ppersist)
459                                 return 0;
460                 }
461         }
462         if (bc->hdlctx.state == tx_idle && bc->hdlctx.bufcnt > 0) {
463                 bc->hdlctx.state = tx_keyup;
464                 bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_delay);
465                 bc->ptt_keyed++;
466         }
467         while (cnt > 0) {
468                 switch (bc->hdlctx.state) {
469                 case tx_keyup:
470                         i = min_t(int, cnt, bc->hdlctx.flags);
471                         cnt -= i;
472                         bc->hdlctx.flags -= i;
473                         if (bc->hdlctx.flags <= 0)
474                                 bc->hdlctx.state = tx_data;
475                         memset(tmp, 0x7e, sizeof(tmp));
476                         while (i > 0) {
477                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
478                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
479                                         return -1;
480                                 i -= j;
481                         }
482                         break;
483
484                 case tx_data:
485                         if (bc->hdlctx.bufcnt <= 0) {
486                                 encode_hdlc(bc);
487                                 if (bc->hdlctx.bufcnt <= 0) {
488                                         bc->hdlctx.state = tx_tail;
489                                         bc->hdlctx.flags = tenms_to_flags(bc, bc->ch_params.tx_tail);
490                                         break;
491                                 }
492                         }
493                         i = min_t(int, cnt, bc->hdlctx.bufcnt);
494                         bc->hdlctx.bufcnt -= i;
495                         cnt -= i;
496                         if (i != pp->ops->epp_write_data(pp, bc->hdlctx.bufptr, i, 0))
497                                         return -1;
498                         bc->hdlctx.bufptr += i;
499                         break;
500                         
501                 case tx_tail:
502                         encode_hdlc(bc);
503                         if (bc->hdlctx.bufcnt > 0) {
504                                 bc->hdlctx.state = tx_data;
505                                 break;
506                         }
507                         i = min_t(int, cnt, bc->hdlctx.flags);
508                         if (i) {
509                                 cnt -= i;
510                                 bc->hdlctx.flags -= i;
511                                 memset(tmp, 0x7e, sizeof(tmp));
512                                 while (i > 0) {
513                                         j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
514                                         if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
515                                                 return -1;
516                                         i -= j;
517                                 }
518                                 break;
519                         }
520
521                 default:  /* fall through */
522                         if (bc->hdlctx.calibrate <= 0)
523                                 return 0;
524                         i = min_t(int, cnt, bc->hdlctx.calibrate);
525                         cnt -= i;
526                         bc->hdlctx.calibrate -= i;
527                         memset(tmp, 0, sizeof(tmp));
528                         while (i > 0) {
529                                 j = (i > sizeof(tmp)) ? sizeof(tmp) : i;
530                                 if (j != pp->ops->epp_write_data(pp, tmp, j, 0))
531                                         return -1;
532                                 i -= j;
533                         }
534                         break;
535                 }
536         }
537         return 0;
538 }
539
540 /* ---------------------------------------------------------------------- */
541
542 static void do_rxpacket(struct net_device *dev)
543 {
544         struct baycom_state *bc = netdev_priv(dev);
545         struct sk_buff *skb;
546         unsigned char *cp;
547         unsigned pktlen;
548
549         if (bc->hdlcrx.bufcnt < 4) 
550                 return;
551         if (!check_crc_ccitt(bc->hdlcrx.buf, bc->hdlcrx.bufcnt)) 
552                 return;
553         pktlen = bc->hdlcrx.bufcnt-2+1; /* KISS kludge */
554         if (!(skb = dev_alloc_skb(pktlen))) {
555                 printk("%s: memory squeeze, dropping packet\n", dev->name);
556                 bc->stats.rx_dropped++;
557                 return;
558         }
559         cp = skb_put(skb, pktlen);
560         *cp++ = 0; /* KISS kludge */
561         memcpy(cp, bc->hdlcrx.buf, pktlen - 1);
562         skb->protocol = ax25_type_trans(skb, dev);
563         netif_rx(skb);
564         dev->last_rx = jiffies;
565         bc->stats.rx_packets++;
566 }
567
568 static int receive(struct net_device *dev, int cnt)
569 {
570         struct baycom_state *bc = netdev_priv(dev);
571         struct parport *pp = bc->pdev->port;
572         unsigned int bitbuf, notbitstream, bitstream, numbits, state;
573         unsigned char tmp[128];
574         unsigned char *cp;
575         int cnt2, ret = 0;
576         int j;
577         
578         numbits = bc->hdlcrx.numbits;
579         state = bc->hdlcrx.state;
580         bitstream = bc->hdlcrx.bitstream;
581         bitbuf = bc->hdlcrx.bitbuf;
582         while (cnt > 0) {
583                 cnt2 = (cnt > sizeof(tmp)) ? sizeof(tmp) : cnt;
584                 cnt -= cnt2;
585                 if (cnt2 != pp->ops->epp_read_data(pp, tmp, cnt2, 0)) {
586                         ret = -1;
587                         break;
588                 }
589                 cp = tmp;
590                 for (; cnt2 > 0; cnt2--, cp++) {
591                         bitstream >>= 8;
592                         bitstream |= (*cp) << 8;
593                         bitbuf >>= 8;
594                         bitbuf |= (*cp) << 8;
595                         numbits += 8;
596                         notbitstream = ~bitstream;
597                         for (j = 0; j < 8; j++) {
598
599                                 /* flag or abort */
600                                 if (unlikely(!(notbitstream & (0x0fc << j)))) {
601
602                                         /* abort received */
603                                         if (!(notbitstream & (0x1fc << j)))
604                                                 state = 0;
605
606                                         /* not flag received */
607                                         else if (!(bitstream & (0x1fe << j)) != (0x0fc << j)) {
608                                                 if (state)
609                                                         do_rxpacket(dev);
610                                                 bc->hdlcrx.bufcnt = 0;
611                                                 bc->hdlcrx.bufptr = bc->hdlcrx.buf;
612                                                 state = 1;
613                                                 numbits = 7-j;
614                                                 }
615                                         }
616
617                                 /* stuffed bit */
618                                 else if (unlikely((bitstream & (0x1f8 << j)) == (0xf8 << j))) {
619                                         numbits--;
620                                         bitbuf = (bitbuf & ((~0xff) << j)) | ((bitbuf & ~((~0xff) << j)) << 1);
621                                         }
622                                 }
623                         while (state && numbits >= 8) {
624                                 if (bc->hdlcrx.bufcnt >= TXBUFFER_SIZE) {
625                                         state = 0;
626                                 } else {
627                                         *(bc->hdlcrx.bufptr)++ = bitbuf >> (16-numbits);
628                                         bc->hdlcrx.bufcnt++;
629                                         numbits -= 8;
630                                 }
631                         }
632                 }
633         }
634         bc->hdlcrx.numbits = numbits;
635         bc->hdlcrx.state = state;
636         bc->hdlcrx.bitstream = bitstream;
637         bc->hdlcrx.bitbuf = bitbuf;
638         return ret;
639 }
640
641 /* --------------------------------------------------------------------- */
642
643 #ifdef __i386__
644 #include <asm/msr.h>
645 #define GETTICK(x)                                                \
646 ({                                                                \
647         if (cpu_has_tsc)                                          \
648                 rdtscl(x);                                        \
649 })
650 #else /* __i386__ */
651 #define GETTICK(x)
652 #endif /* __i386__ */
653
654 static void epp_bh(struct work_struct *work)
655 {
656         struct net_device *dev;
657         struct baycom_state *bc;
658         struct parport *pp;
659         unsigned char stat;
660         unsigned char tmp[2];
661         unsigned int time1 = 0, time2 = 0, time3 = 0;
662         int cnt, cnt2;
663
664         bc = container_of(work, struct baycom_state, run_work.work);
665         dev = bc->dev;
666         if (!bc->work_running)
667                 return;
668         baycom_int_freq(bc);
669         pp = bc->pdev->port;
670         /* update status */
671         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
672                 goto epptimeout;
673         bc->stat = stat;
674         bc->debug_vals.last_pllcorr = stat;
675         GETTICK(time1);
676         if (bc->modem == EPP_FPGAEXTSTATUS) {
677                 /* get input count */
678                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|1;
679                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
680                         goto epptimeout;
681                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
682                         goto epptimeout;
683                 cnt = tmp[0] | (tmp[1] << 8);
684                 cnt &= 0x7fff;
685                 /* get output count */
686                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE|2;
687                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
688                         goto epptimeout;
689                 if (pp->ops->epp_read_addr(pp, tmp, 2, 0) != 2)
690                         goto epptimeout;
691                 cnt2 = tmp[0] | (tmp[1] << 8);
692                 cnt2 = 16384 - (cnt2 & 0x7fff);
693                 /* return to normal */
694                 tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
695                 if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
696                         goto epptimeout;
697                 if (transmit(bc, cnt2, stat))
698                         goto epptimeout;
699                 GETTICK(time2);
700                 if (receive(dev, cnt))
701                         goto epptimeout;
702                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
703                         goto epptimeout;
704                 bc->stat = stat;
705         } else {
706                 /* try to tx */
707                 switch (stat & (EPP_NTAEF|EPP_NTHF)) {
708                 case EPP_NTHF:
709                         cnt = 2048 - 256;
710                         break;
711                 
712                 case EPP_NTAEF:
713                         cnt = 2048 - 1793;
714                         break;
715                 
716                 case 0:
717                         cnt = 0;
718                         break;
719                 
720                 default:
721                         cnt = 2048 - 1025;
722                         break;
723                 }
724                 if (transmit(bc, cnt, stat))
725                         goto epptimeout;
726                 GETTICK(time2);
727                 /* do receiver */
728                 while ((stat & (EPP_NRAEF|EPP_NRHF)) != EPP_NRHF) {
729                         switch (stat & (EPP_NRAEF|EPP_NRHF)) {
730                         case EPP_NRAEF:
731                                 cnt = 1025;
732                                 break;
733
734                         case 0:
735                                 cnt = 1793;
736                                 break;
737
738                         default:
739                                 cnt = 256;
740                                 break;
741                         }
742                         if (receive(dev, cnt))
743                                 goto epptimeout;
744                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
745                                 goto epptimeout;
746                 }
747                 cnt = 0;
748                 if (bc->bitrate < 50000)
749                         cnt = 256;
750                 else if (bc->bitrate < 100000)
751                         cnt = 128;
752                 while (cnt > 0 && stat & EPP_NREF) {
753                         if (receive(dev, 1))
754                                 goto epptimeout;
755                         cnt--;
756                         if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
757                                 goto epptimeout;
758                 }
759         }
760         GETTICK(time3);
761 #ifdef BAYCOM_DEBUG
762         bc->debug_vals.mod_cycles = time2 - time1;
763         bc->debug_vals.demod_cycles = time3 - time2;
764 #endif /* BAYCOM_DEBUG */
765         schedule_delayed_work(&bc->run_work, 1);
766         if (!bc->skb)
767                 netif_wake_queue(dev);
768         return;
769  epptimeout:
770         printk(KERN_ERR "%s: EPP timeout!\n", bc_drvname);
771 }
772
773 /* ---------------------------------------------------------------------- */
774 /*
775  * ===================== network driver interface =========================
776  */
777
778 static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
779 {
780         struct baycom_state *bc = netdev_priv(dev);
781
782         if (skb->data[0] != 0) {
783                 do_kiss_params(bc, skb->data, skb->len);
784                 dev_kfree_skb(skb);
785                 return 0;
786         }
787         if (bc->skb)
788                 return -1;
789         /* strip KISS byte */
790         if (skb->len >= HDLCDRV_MAXFLEN+1 || skb->len < 3) {
791                 dev_kfree_skb(skb);
792                 return 0;
793         }
794         netif_stop_queue(dev);
795         bc->skb = skb;
796         return 0;
797 }
798
799 /* --------------------------------------------------------------------- */
800
801 static int baycom_set_mac_address(struct net_device *dev, void *addr)
802 {
803         struct sockaddr *sa = (struct sockaddr *)addr;
804
805         /* addr is an AX.25 shifted ASCII mac address */
806         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); 
807         return 0;                                         
808 }
809
810 /* --------------------------------------------------------------------- */
811
812 static struct net_device_stats *baycom_get_stats(struct net_device *dev)
813 {
814         struct baycom_state *bc = netdev_priv(dev);
815
816         /* 
817          * Get the current statistics.  This may be called with the
818          * card open or closed. 
819          */
820         return &bc->stats;
821 }
822
823 /* --------------------------------------------------------------------- */
824
825 static void epp_wakeup(void *handle)
826 {
827         struct net_device *dev = (struct net_device *)handle;
828         struct baycom_state *bc = netdev_priv(dev);
829
830         printk(KERN_DEBUG "baycom_epp: %s: why am I being woken up?\n", dev->name);
831         if (!parport_claim(bc->pdev))
832                 printk(KERN_DEBUG "baycom_epp: %s: I'm broken.\n", dev->name);
833 }
834
835 /* --------------------------------------------------------------------- */
836
837 /*
838  * Open/initialize the board. This is called (in the current kernel)
839  * sometime after booting when the 'ifconfig' program is run.
840  *
841  * This routine should set everything up anew at each open, even
842  * registers that "should" only need to be set once at boot, so that
843  * there is non-reboot way to recover if something goes wrong.
844  */
845
846 static int epp_open(struct net_device *dev)
847 {
848         struct baycom_state *bc = netdev_priv(dev);
849         struct parport *pp = parport_find_base(dev->base_addr);
850         unsigned int i, j;
851         unsigned char tmp[128];
852         unsigned char stat;
853         unsigned long tstart;
854         
855         if (!pp) {
856                 printk(KERN_ERR "%s: parport at 0x%lx unknown\n", bc_drvname, dev->base_addr);
857                 return -ENXIO;
858         }
859 #if 0
860         if (pp->irq < 0) {
861                 printk(KERN_ERR "%s: parport at 0x%lx has no irq\n", bc_drvname, pp->base);
862                 parport_put_port(pp);
863                 return -ENXIO;
864         }
865 #endif
866         if ((~pp->modes) & (PARPORT_MODE_TRISTATE | PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT)) {
867                 printk(KERN_ERR "%s: parport at 0x%lx cannot be used\n",
868                        bc_drvname, pp->base);
869                 parport_put_port(pp);
870                 return -EIO;
871         }
872         memset(&bc->modem, 0, sizeof(bc->modem));
873         bc->pdev = parport_register_device(pp, dev->name, NULL, epp_wakeup, 
874                                         epp_interrupt, PARPORT_DEV_EXCL, dev);
875         parport_put_port(pp);
876         if (!bc->pdev) {
877                 printk(KERN_ERR "%s: cannot register parport at 0x%lx\n", bc_drvname, pp->base);
878                 return -ENXIO;
879         }
880         if (parport_claim(bc->pdev)) {
881                 printk(KERN_ERR "%s: parport at 0x%lx busy\n", bc_drvname, pp->base);
882                 parport_unregister_device(bc->pdev);
883                 return -EBUSY;
884         }
885         dev->irq = /*pp->irq*/ 0;
886         INIT_DELAYED_WORK(&bc->run_work, epp_bh);
887         bc->work_running = 1;
888         bc->modem = EPP_CONVENTIONAL;
889         if (eppconfig(bc))
890                 printk(KERN_INFO "%s: no FPGA detected, assuming conventional EPP modem\n", bc_drvname);
891         else
892                 bc->modem = /*EPP_FPGA*/ EPP_FPGAEXTSTATUS;
893         parport_write_control(pp, LPTCTRL_PROGRAM); /* prepare EPP mode; we aren't using interrupts */
894         /* reset the modem */
895         tmp[0] = 0;
896         tmp[1] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE;
897         if (pp->ops->epp_write_addr(pp, tmp, 2, 0) != 2)
898                 goto epptimeout;
899         /* autoprobe baud rate */
900         tstart = jiffies;
901         i = 0;
902         while (time_before(jiffies, tstart + HZ/3)) {
903                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
904                         goto epptimeout;
905                 if ((stat & (EPP_NRAEF|EPP_NRHF)) == EPP_NRHF) {
906                         schedule();
907                         continue;
908                 }
909                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
910                         goto epptimeout;
911                 if (pp->ops->epp_read_data(pp, tmp, 128, 0) != 128)
912                         goto epptimeout;
913                 i += 256;
914         }
915         for (j = 0; j < 256; j++) {
916                 if (pp->ops->epp_read_addr(pp, &stat, 1, 0) != 1)
917                         goto epptimeout;
918                 if (!(stat & EPP_NREF))
919                         break;
920                 if (pp->ops->epp_read_data(pp, tmp, 1, 0) != 1)
921                         goto epptimeout;
922                 i++;
923         }
924         tstart = jiffies - tstart;
925         bc->bitrate = i * (8 * HZ) / tstart;
926         j = 1;
927         i = bc->bitrate >> 3;
928         while (j < 7 && i > 150) {
929                 j++;
930                 i >>= 1;
931         }
932         printk(KERN_INFO "%s: autoprobed bitrate: %d  int divider: %d  int rate: %d\n", 
933                bc_drvname, bc->bitrate, j, bc->bitrate >> (j+2));
934         tmp[0] = EPP_TX_FIFO_ENABLE|EPP_RX_FIFO_ENABLE|EPP_MODEM_ENABLE/*|j*/;
935         if (pp->ops->epp_write_addr(pp, tmp, 1, 0) != 1)
936                 goto epptimeout;
937         /*
938          * initialise hdlc variables
939          */
940         bc->hdlcrx.state = 0;
941         bc->hdlcrx.numbits = 0;
942         bc->hdlctx.state = tx_idle;
943         bc->hdlctx.bufcnt = 0;
944         bc->hdlctx.slotcnt = bc->ch_params.slottime;
945         bc->hdlctx.calibrate = 0;
946         /* start the bottom half stuff */
947         schedule_delayed_work(&bc->run_work, 1);
948         netif_start_queue(dev);
949         return 0;
950
951  epptimeout:
952         printk(KERN_ERR "%s: epp timeout during bitrate probe\n", bc_drvname);
953         parport_write_control(pp, 0); /* reset the adapter */
954         parport_release(bc->pdev);
955         parport_unregister_device(bc->pdev);
956         return -EIO;
957 }
958
959 /* --------------------------------------------------------------------- */
960
961 static int epp_close(struct net_device *dev)
962 {
963         struct baycom_state *bc = netdev_priv(dev);
964         struct parport *pp = bc->pdev->port;
965         unsigned char tmp[1];
966
967         bc->work_running = 0;
968         flush_scheduled_work();
969         bc->stat = EPP_DCDBIT;
970         tmp[0] = 0;
971         pp->ops->epp_write_addr(pp, tmp, 1, 0);
972         parport_write_control(pp, 0); /* reset the adapter */
973         parport_release(bc->pdev);
974         parport_unregister_device(bc->pdev);
975         if (bc->skb)
976                 dev_kfree_skb(bc->skb);
977         bc->skb = NULL;
978         printk(KERN_INFO "%s: close epp at iobase 0x%lx irq %u\n",
979                bc_drvname, dev->base_addr, dev->irq);
980         return 0;
981 }
982
983 /* --------------------------------------------------------------------- */
984
985 static int baycom_setmode(struct baycom_state *bc, const char *modestr)
986 {
987         const char *cp;
988
989         if (strstr(modestr,"intclk"))
990                 bc->cfg.intclk = 1;
991         if (strstr(modestr,"extclk"))
992                 bc->cfg.intclk = 0;
993         if (strstr(modestr,"intmodem"))
994                 bc->cfg.extmodem = 0;
995         if (strstr(modestr,"extmodem"))
996                 bc->cfg.extmodem = 1;
997         if (strstr(modestr,"noloopback"))
998                 bc->cfg.loopback = 0;
999         if (strstr(modestr,"loopback"))
1000                 bc->cfg.loopback = 1;
1001         if ((cp = strstr(modestr,"fclk="))) {
1002                 bc->cfg.fclk = simple_strtoul(cp+5, NULL, 0);
1003                 if (bc->cfg.fclk < 1000000)
1004                         bc->cfg.fclk = 1000000;
1005                 if (bc->cfg.fclk > 25000000)
1006                         bc->cfg.fclk = 25000000;
1007         }
1008         if ((cp = strstr(modestr,"bps="))) {
1009                 bc->cfg.bps = simple_strtoul(cp+4, NULL, 0);
1010                 if (bc->cfg.bps < 1000)
1011                         bc->cfg.bps = 1000;
1012                 if (bc->cfg.bps > 1500000)
1013                         bc->cfg.bps = 1500000;
1014         }
1015         return 0;
1016 }
1017
1018 /* --------------------------------------------------------------------- */
1019
1020 static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1021 {
1022         struct baycom_state *bc = netdev_priv(dev);
1023         struct hdlcdrv_ioctl hi;
1024
1025         if (cmd != SIOCDEVPRIVATE)
1026                 return -ENOIOCTLCMD;
1027
1028         if (copy_from_user(&hi, ifr->ifr_data, sizeof(hi)))
1029                 return -EFAULT;
1030         switch (hi.cmd) {
1031         default:
1032                 return -ENOIOCTLCMD;
1033
1034         case HDLCDRVCTL_GETCHANNELPAR:
1035                 hi.data.cp.tx_delay = bc->ch_params.tx_delay;
1036                 hi.data.cp.tx_tail = bc->ch_params.tx_tail;
1037                 hi.data.cp.slottime = bc->ch_params.slottime;
1038                 hi.data.cp.ppersist = bc->ch_params.ppersist;
1039                 hi.data.cp.fulldup = bc->ch_params.fulldup;
1040                 break;
1041
1042         case HDLCDRVCTL_SETCHANNELPAR:
1043                 if (!capable(CAP_NET_ADMIN))
1044                         return -EACCES;
1045                 bc->ch_params.tx_delay = hi.data.cp.tx_delay;
1046                 bc->ch_params.tx_tail = hi.data.cp.tx_tail;
1047                 bc->ch_params.slottime = hi.data.cp.slottime;
1048                 bc->ch_params.ppersist = hi.data.cp.ppersist;
1049                 bc->ch_params.fulldup = hi.data.cp.fulldup;
1050                 bc->hdlctx.slotcnt = 1;
1051                 return 0;
1052                 
1053         case HDLCDRVCTL_GETMODEMPAR:
1054                 hi.data.mp.iobase = dev->base_addr;
1055                 hi.data.mp.irq = dev->irq;
1056                 hi.data.mp.dma = dev->dma;
1057                 hi.data.mp.dma2 = 0;
1058                 hi.data.mp.seriobase = 0;
1059                 hi.data.mp.pariobase = 0;
1060                 hi.data.mp.midiiobase = 0;
1061                 break;
1062
1063         case HDLCDRVCTL_SETMODEMPAR:
1064                 if ((!capable(CAP_SYS_RAWIO)) || netif_running(dev))
1065                         return -EACCES;
1066                 dev->base_addr = hi.data.mp.iobase;
1067                 dev->irq = /*hi.data.mp.irq*/0;
1068                 dev->dma = /*hi.data.mp.dma*/0;
1069                 return 0;       
1070                 
1071         case HDLCDRVCTL_GETSTAT:
1072                 hi.data.cs.ptt = !!(bc->stat & EPP_PTTBIT);
1073                 hi.data.cs.dcd = !(bc->stat & EPP_DCDBIT);
1074                 hi.data.cs.ptt_keyed = bc->ptt_keyed;
1075                 hi.data.cs.tx_packets = bc->stats.tx_packets;
1076                 hi.data.cs.tx_errors = bc->stats.tx_errors;
1077                 hi.data.cs.rx_packets = bc->stats.rx_packets;
1078                 hi.data.cs.rx_errors = bc->stats.rx_errors;
1079                 break;          
1080
1081         case HDLCDRVCTL_OLDGETSTAT:
1082                 hi.data.ocs.ptt = !!(bc->stat & EPP_PTTBIT);
1083                 hi.data.ocs.dcd = !(bc->stat & EPP_DCDBIT);
1084                 hi.data.ocs.ptt_keyed = bc->ptt_keyed;
1085                 break;          
1086
1087         case HDLCDRVCTL_CALIBRATE:
1088                 if (!capable(CAP_SYS_RAWIO))
1089                         return -EACCES;
1090                 bc->hdlctx.calibrate = hi.data.calibrate * bc->bitrate / 8;
1091                 return 0;
1092
1093         case HDLCDRVCTL_DRIVERNAME:
1094                 strncpy(hi.data.drivername, "baycom_epp", sizeof(hi.data.drivername));
1095                 break;
1096                 
1097         case HDLCDRVCTL_GETMODE:
1098                 sprintf(hi.data.modename, "%sclk,%smodem,fclk=%d,bps=%d%s", 
1099                         bc->cfg.intclk ? "int" : "ext",
1100                         bc->cfg.extmodem ? "ext" : "int", bc->cfg.fclk, bc->cfg.bps,
1101                         bc->cfg.loopback ? ",loopback" : "");
1102                 break;
1103
1104         case HDLCDRVCTL_SETMODE:
1105                 if (!capable(CAP_NET_ADMIN) || netif_running(dev))
1106                         return -EACCES;
1107                 hi.data.modename[sizeof(hi.data.modename)-1] = '\0';
1108                 return baycom_setmode(bc, hi.data.modename);
1109
1110         case HDLCDRVCTL_MODELIST:
1111                 strncpy(hi.data.modename, "intclk,extclk,intmodem,extmodem,divider=x",
1112                         sizeof(hi.data.modename));
1113                 break;
1114
1115         case HDLCDRVCTL_MODEMPARMASK:
1116                 return HDLCDRV_PARMASK_IOBASE;
1117
1118         }
1119         if (copy_to_user(ifr->ifr_data, &hi, sizeof(hi)))
1120                 return -EFAULT;
1121         return 0;
1122 }
1123
1124 /* --------------------------------------------------------------------- */
1125
1126 /*
1127  * Check for a network adaptor of this type, and return '0' if one exists.
1128  * If dev->base_addr == 0, probe all likely locations.
1129  * If dev->base_addr == 1, always return failure.
1130  * If dev->base_addr == 2, allocate space for the device and return success
1131  * (detachable devices only).
1132  */
1133 static void baycom_probe(struct net_device *dev)
1134 {
1135         const struct hdlcdrv_channel_params dflt_ch_params = { 
1136                 20, 2, 10, 40, 0 
1137         };
1138         struct baycom_state *bc;
1139
1140         /*
1141          * not a real probe! only initialize data structures
1142          */
1143         bc = netdev_priv(dev);
1144         /*
1145          * initialize the baycom_state struct
1146          */
1147         bc->ch_params = dflt_ch_params;
1148         bc->ptt_keyed = 0;
1149
1150         /*
1151          * initialize the device struct
1152          */
1153         dev->open = epp_open;
1154         dev->stop = epp_close;
1155         dev->do_ioctl = baycom_ioctl;
1156         dev->hard_start_xmit = baycom_send_packet;
1157         dev->get_stats = baycom_get_stats;
1158
1159         /* Fill in the fields of the device structure */
1160         bc->skb = NULL;
1161         
1162         dev->header_ops = &ax25_header_ops;
1163         dev->set_mac_address = baycom_set_mac_address;
1164         
1165         dev->type = ARPHRD_AX25;           /* AF_AX25 device */
1166         dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1167         dev->mtu = AX25_DEF_PACLEN;        /* eth_mtu is the default */
1168         dev->addr_len = AX25_ADDR_LEN;     /* sizeof an ax.25 address */
1169         memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1170         memcpy(dev->dev_addr, &null_ax25_address, AX25_ADDR_LEN);
1171         dev->tx_queue_len = 16;
1172
1173         /* New style flags */
1174         dev->flags = 0;
1175 }
1176
1177 /* --------------------------------------------------------------------- */
1178
1179 /*
1180  * command line settable parameters
1181  */
1182 static const char *mode[NR_PORTS] = { "", };
1183 static int iobase[NR_PORTS] = { 0x378, };
1184
1185 module_param_array(mode, charp, NULL, 0);
1186 MODULE_PARM_DESC(mode, "baycom operating mode");
1187 module_param_array(iobase, int, NULL, 0);
1188 MODULE_PARM_DESC(iobase, "baycom io base address");
1189
1190 MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
1191 MODULE_DESCRIPTION("Baycom epp amateur radio modem driver");
1192 MODULE_LICENSE("GPL");
1193
1194 /* --------------------------------------------------------------------- */
1195
1196 static void __init baycom_epp_dev_setup(struct net_device *dev)
1197 {
1198         struct baycom_state *bc = netdev_priv(dev);
1199
1200         /*
1201          * initialize part of the baycom_state struct
1202          */
1203         bc->dev = dev;
1204         bc->magic = BAYCOM_MAGIC;
1205         bc->cfg.fclk = 19666600;
1206         bc->cfg.bps = 9600;
1207         /*
1208          * initialize part of the device struct
1209          */
1210         baycom_probe(dev);
1211 }
1212
1213 static int __init init_baycomepp(void)
1214 {
1215         int i, found = 0;
1216         char set_hw = 1;
1217
1218         printk(bc_drvinfo);
1219         /*
1220          * register net devices
1221          */
1222         for (i = 0; i < NR_PORTS; i++) {
1223                 struct net_device *dev;
1224                 
1225                 dev = alloc_netdev(sizeof(struct baycom_state), "bce%d",
1226                                    baycom_epp_dev_setup);
1227
1228                 if (!dev) {
1229                         printk(KERN_WARNING "bce%d : out of memory\n", i);
1230                         return found ? 0 : -ENOMEM;
1231                 }
1232                         
1233                 sprintf(dev->name, "bce%d", i);
1234                 dev->base_addr = iobase[i];
1235
1236                 if (!mode[i])
1237                         set_hw = 0;
1238                 if (!set_hw)
1239                         iobase[i] = 0;
1240
1241                 if (register_netdev(dev)) {
1242                         printk(KERN_WARNING "%s: cannot register net device %s\n", bc_drvname, dev->name);
1243                         free_netdev(dev);
1244                         break;
1245                 }
1246                 if (set_hw && baycom_setmode(netdev_priv(dev), mode[i]))
1247                         set_hw = 0;
1248                 baycom_device[i] = dev;
1249                 found++;
1250         }
1251
1252         return found ? 0 : -ENXIO;
1253 }
1254
1255 static void __exit cleanup_baycomepp(void)
1256 {
1257         int i;
1258
1259         for(i = 0; i < NR_PORTS; i++) {
1260                 struct net_device *dev = baycom_device[i];
1261
1262                 if (dev) {
1263                         struct baycom_state *bc = netdev_priv(dev);
1264                         if (bc->magic == BAYCOM_MAGIC) {
1265                                 unregister_netdev(dev);
1266                                 free_netdev(dev);
1267                         } else
1268                                 printk(paranoia_str, "cleanup_module");
1269                 }
1270         }
1271 }
1272
1273 module_init(init_baycomepp);
1274 module_exit(cleanup_baycomepp);
1275
1276 /* --------------------------------------------------------------------- */
1277
1278 #ifndef MODULE
1279
1280 /*
1281  * format: baycom_epp=io,mode
1282  * mode: fpga config options
1283  */
1284
1285 static int __init baycom_epp_setup(char *str)
1286 {
1287         static unsigned __initdata nr_dev = 0;
1288         int ints[2];
1289
1290         if (nr_dev >= NR_PORTS)
1291                 return 0;
1292         str = get_options(str, 2, ints);
1293         if (ints[0] < 1)
1294                 return 0;
1295         mode[nr_dev] = str;
1296         iobase[nr_dev] = ints[1];
1297         nr_dev++;
1298         return 1;
1299 }
1300
1301 __setup("baycom_epp=", baycom_epp_setup);
1302
1303 #endif /* MODULE */
1304 /* --------------------------------------------------------------------- */