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64#include <linux/module.h>
65#include <linux/ioport.h>
66#include <linux/string.h>
67#include <linux/init.h>
68#include <asm/uaccess.h>
69#include <asm/io.h>
70#include <linux/hdlcdrv.h>
71#include <linux/baycom.h>
72#include <linux/jiffies.h>
73
74
75
76#define BAYCOM_DEBUG
77
78
79
80static const char bc_drvname[] = "baycom_ser_hdx";
81static const char bc_drvinfo[] = KERN_INFO "baycom_ser_hdx: (C) 1996-2000 Thomas Sailer, HB9JNX/AE4WA\n"
82KERN_INFO "baycom_ser_hdx: version 0.10 compiled " __TIME__ " " __DATE__ "\n";
83
84
85
86#define NR_PORTS 4
87
88static struct net_device *baycom_device[NR_PORTS];
89
90
91
92#define RBR(iobase) (iobase+0)
93#define THR(iobase) (iobase+0)
94#define IER(iobase) (iobase+1)
95#define IIR(iobase) (iobase+2)
96#define FCR(iobase) (iobase+2)
97#define LCR(iobase) (iobase+3)
98#define MCR(iobase) (iobase+4)
99#define LSR(iobase) (iobase+5)
100#define MSR(iobase) (iobase+6)
101#define SCR(iobase) (iobase+7)
102#define DLL(iobase) (iobase+0)
103#define DLM(iobase) (iobase+1)
104
105#define SER12_EXTENT 8
106
107
108
109
110
111
112struct baycom_state {
113 struct hdlcdrv_state hdrv;
114
115 int opt_dcd;
116
117 struct modem_state {
118 short arb_divider;
119 unsigned char flags;
120 unsigned int shreg;
121 struct modem_state_ser12 {
122 unsigned char tx_bit;
123 int dcd_sum0, dcd_sum1, dcd_sum2;
124 unsigned char last_sample;
125 unsigned char last_rxbit;
126 unsigned int dcd_shreg;
127 unsigned int dcd_time;
128 unsigned int bit_pll;
129 unsigned char interm_sample;
130 } ser12;
131 } modem;
132
133#ifdef BAYCOM_DEBUG
134 struct debug_vals {
135 unsigned long last_jiffies;
136 unsigned cur_intcnt;
137 unsigned last_intcnt;
138 int cur_pllcorr;
139 int last_pllcorr;
140 } debug_vals;
141#endif
142};
143
144
145
146static inline void baycom_int_freq(struct baycom_state *bc)
147{
148#ifdef BAYCOM_DEBUG
149 unsigned long cur_jiffies = jiffies;
150
151
152
153 bc->debug_vals.cur_intcnt++;
154 if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) {
155 bc->debug_vals.last_jiffies = cur_jiffies;
156 bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt;
157 bc->debug_vals.cur_intcnt = 0;
158 bc->debug_vals.last_pllcorr = bc->debug_vals.cur_pllcorr;
159 bc->debug_vals.cur_pllcorr = 0;
160 }
161#endif
162}
163
164
165
166
167
168
169static inline void ser12_set_divisor(struct net_device *dev,
170 unsigned char divisor)
171{
172 outb(0x81, LCR(dev->base_addr));
173 outb(divisor, DLL(dev->base_addr));
174 outb(0, DLM(dev->base_addr));
175 outb(0x01, LCR(dev->base_addr));
176
177
178
179
180
181 outb(0x00, THR(dev->base_addr));
182
183
184
185
186
187
188}
189
190
191
192
193
194
195#define SER12_ARB_DIVIDER(bc) (bc->opt_dcd ? 24 : 36)
196
197#define SER12_DCD_INTERVAL(bc) (bc->opt_dcd ? 12 : 240)
198
199static inline void ser12_tx(struct net_device *dev, struct baycom_state *bc)
200{
201
202 ser12_set_divisor(dev, 12);
203
204
205
206
207 outb(0x0e | (!!bc->modem.ser12.tx_bit), MCR(dev->base_addr));
208 if (bc->modem.shreg <= 1)
209 bc->modem.shreg = 0x10000 | hdlcdrv_getbits(&bc->hdrv);
210 bc->modem.ser12.tx_bit = !(bc->modem.ser12.tx_bit ^
211 (bc->modem.shreg & 1));
212 bc->modem.shreg >>= 1;
213}
214
215
216
217static inline void ser12_rx(struct net_device *dev, struct baycom_state *bc)
218{
219 unsigned char cur_s;
220
221
222
223 cur_s = inb(MSR(dev->base_addr)) & 0x10;
224 hdlcdrv_channelbit(&bc->hdrv, cur_s);
225 bc->modem.ser12.dcd_shreg = (bc->modem.ser12.dcd_shreg << 1) |
226 (cur_s != bc->modem.ser12.last_sample);
227 bc->modem.ser12.last_sample = cur_s;
228 if(bc->modem.ser12.dcd_shreg & 1) {
229 if (!bc->opt_dcd) {
230 unsigned int dcdspos, dcdsneg;
231
232 dcdspos = dcdsneg = 0;
233 dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
234 if (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
235 dcdspos += 2;
236 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
237 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
238 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
239
240 bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
241 } else
242 bc->modem.ser12.dcd_sum0--;
243 }
244 if(!bc->modem.ser12.dcd_time) {
245 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
246 bc->modem.ser12.dcd_sum1 +
247 bc->modem.ser12.dcd_sum2) < 0);
248 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
249 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
250
251 bc->modem.ser12.dcd_sum0 = 2;
252 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
253 }
254 bc->modem.ser12.dcd_time--;
255 if (!bc->opt_dcd) {
256
257
258
259 if (bc->modem.ser12.interm_sample) {
260
261
262
263 ser12_set_divisor(dev, 4);
264 } else {
265
266
267
268 switch (bc->modem.ser12.dcd_shreg & 7) {
269 case 1:
270 ser12_set_divisor(dev, 5);
271#ifdef BAYCOM_DEBUG
272 bc->debug_vals.cur_pllcorr++;
273#endif
274 break;
275 case 4:
276 ser12_set_divisor(dev, 3);
277#ifdef BAYCOM_DEBUG
278 bc->debug_vals.cur_pllcorr--;
279#endif
280 break;
281 default:
282 ser12_set_divisor(dev, 4);
283 break;
284 }
285 bc->modem.shreg >>= 1;
286 if (bc->modem.ser12.last_sample ==
287 bc->modem.ser12.last_rxbit)
288 bc->modem.shreg |= 0x10000;
289 bc->modem.ser12.last_rxbit =
290 bc->modem.ser12.last_sample;
291 }
292 if (++bc->modem.ser12.interm_sample >= 3)
293 bc->modem.ser12.interm_sample = 0;
294
295
296
297 if (bc->modem.ser12.dcd_shreg & 1) {
298 unsigned int dcdspos, dcdsneg;
299
300 dcdspos = dcdsneg = 0;
301 dcdspos += ((bc->modem.ser12.dcd_shreg >> 1) & 1);
302 dcdspos += (!(bc->modem.ser12.dcd_shreg & 0x7ffffffe))
303 << 1;
304 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 2) & 1);
305 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 3) & 1);
306 dcdsneg += ((bc->modem.ser12.dcd_shreg >> 4) & 1);
307
308 bc->modem.ser12.dcd_sum0 += 16*dcdspos - dcdsneg;
309 }
310 } else {
311
312
313
314 if (bc->modem.ser12.interm_sample) {
315
316
317
318 ser12_set_divisor(dev, 6);
319 } else {
320
321
322
323 switch (bc->modem.ser12.dcd_shreg & 3) {
324 case 1:
325 ser12_set_divisor(dev, 7);
326#ifdef BAYCOM_DEBUG
327 bc->debug_vals.cur_pllcorr++;
328#endif
329 break;
330 case 2:
331 ser12_set_divisor(dev, 5);
332#ifdef BAYCOM_DEBUG
333 bc->debug_vals.cur_pllcorr--;
334#endif
335 break;
336 default:
337 ser12_set_divisor(dev, 6);
338 break;
339 }
340 bc->modem.shreg >>= 1;
341 if (bc->modem.ser12.last_sample ==
342 bc->modem.ser12.last_rxbit)
343 bc->modem.shreg |= 0x10000;
344 bc->modem.ser12.last_rxbit =
345 bc->modem.ser12.last_sample;
346 }
347 bc->modem.ser12.interm_sample = !bc->modem.ser12.interm_sample;
348
349
350
351 bc->modem.ser12.dcd_sum0 -= (bc->modem.ser12.dcd_shreg & 1);
352 }
353 outb(0x0d, MCR(dev->base_addr));
354 if (bc->modem.shreg & 1) {
355 hdlcdrv_putbits(&bc->hdrv, bc->modem.shreg >> 1);
356 bc->modem.shreg = 0x10000;
357 }
358 if(!bc->modem.ser12.dcd_time) {
359 if (bc->opt_dcd & 1)
360 hdlcdrv_setdcd(&bc->hdrv, !((inb(MSR(dev->base_addr)) ^ bc->opt_dcd) & 0x80));
361 else
362 hdlcdrv_setdcd(&bc->hdrv, (bc->modem.ser12.dcd_sum0 +
363 bc->modem.ser12.dcd_sum1 +
364 bc->modem.ser12.dcd_sum2) < 0);
365 bc->modem.ser12.dcd_sum2 = bc->modem.ser12.dcd_sum1;
366 bc->modem.ser12.dcd_sum1 = bc->modem.ser12.dcd_sum0;
367
368 bc->modem.ser12.dcd_sum0 = 2;
369 bc->modem.ser12.dcd_time = SER12_DCD_INTERVAL(bc);
370 }
371 bc->modem.ser12.dcd_time--;
372}
373
374
375
376static irqreturn_t ser12_interrupt(int irq, void *dev_id)
377{
378 struct net_device *dev = (struct net_device *)dev_id;
379 struct baycom_state *bc = netdev_priv(dev);
380 unsigned char iir;
381
382 if (!dev || !bc || bc->hdrv.magic != HDLCDRV_MAGIC)
383 return IRQ_NONE;
384
385 if ((iir = inb(IIR(dev->base_addr))) & 1)
386 return IRQ_NONE;
387 baycom_int_freq(bc);
388 do {
389 switch (iir & 6) {
390 case 6:
391 inb(LSR(dev->base_addr));
392 break;
393
394 case 4:
395 inb(RBR(dev->base_addr));
396 break;
397
398 case 2:
399
400
401
402 if (hdlcdrv_ptt(&bc->hdrv))
403 ser12_tx(dev, bc);
404 else {
405 ser12_rx(dev, bc);
406 bc->modem.arb_divider--;
407 }
408 outb(0x00, THR(dev->base_addr));
409 break;
410
411 default:
412 inb(MSR(dev->base_addr));
413 break;
414 }
415 iir = inb(IIR(dev->base_addr));
416 } while (!(iir & 1));
417 if (bc->modem.arb_divider <= 0) {
418 bc->modem.arb_divider = SER12_ARB_DIVIDER(bc);
419 local_irq_enable();
420 hdlcdrv_arbitrate(dev, &bc->hdrv);
421 }
422 local_irq_enable();
423 hdlcdrv_transmitter(dev, &bc->hdrv);
424 hdlcdrv_receiver(dev, &bc->hdrv);
425 local_irq_disable();
426 return IRQ_HANDLED;
427}
428
429
430
431enum uart { c_uart_unknown, c_uart_8250,
432 c_uart_16450, c_uart_16550, c_uart_16550A};
433static const char *uart_str[] = {
434 "unknown", "8250", "16450", "16550", "16550A"
435};
436
437static enum uart ser12_check_uart(unsigned int iobase)
438{
439 unsigned char b1,b2,b3;
440 enum uart u;
441 enum uart uart_tab[] =
442 { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
443
444 b1 = inb(MCR(iobase));
445 outb(b1 | 0x10, MCR(iobase));
446 b2 = inb(MSR(iobase));
447 outb(0x1a, MCR(iobase));
448 b3 = inb(MSR(iobase)) & 0xf0;
449 outb(b1, MCR(iobase));
450 outb(b2, MSR(iobase));
451 if (b3 != 0x90)
452 return c_uart_unknown;
453 inb(RBR(iobase));
454 inb(RBR(iobase));
455 outb(0x01, FCR(iobase));
456 u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
457 if (u == c_uart_16450) {
458 outb(0x5a, SCR(iobase));
459 b1 = inb(SCR(iobase));
460 outb(0xa5, SCR(iobase));
461 b2 = inb(SCR(iobase));
462 if ((b1 != 0x5a) || (b2 != 0xa5))
463 u = c_uart_8250;
464 }
465 return u;
466}
467
468
469
470static int ser12_open(struct net_device *dev)
471{
472 struct baycom_state *bc = netdev_priv(dev);
473 enum uart u;
474
475 if (!dev || !bc)
476 return -ENXIO;
477 if (!dev->base_addr || dev->base_addr > 0x1000-SER12_EXTENT ||
478 dev->irq < 2 || dev->irq > 15)
479 return -ENXIO;
480 if (!request_region(dev->base_addr, SER12_EXTENT, "baycom_ser12"))
481 return -EACCES;
482 memset(&bc->modem, 0, sizeof(bc->modem));
483 bc->hdrv.par.bitrate = 1200;
484 if ((u = ser12_check_uart(dev->base_addr)) == c_uart_unknown) {
485 release_region(dev->base_addr, SER12_EXTENT);
486 return -EIO;
487 }
488 outb(0, FCR(dev->base_addr));
489 outb(0x0d, MCR(dev->base_addr));
490 outb(0, IER(dev->base_addr));
491 if (request_irq(dev->irq, ser12_interrupt, IRQF_DISABLED | IRQF_SHARED,
492 "baycom_ser12", dev)) {
493 release_region(dev->base_addr, SER12_EXTENT);
494 return -EBUSY;
495 }
496
497
498
499 outb(2, IER(dev->base_addr));
500
501
502
503
504
505 ser12_set_divisor(dev, bc->opt_dcd ? 6 : 4);
506 printk(KERN_INFO "%s: ser12 at iobase 0x%lx irq %u uart %s\n",
507 bc_drvname, dev->base_addr, dev->irq, uart_str[u]);
508 return 0;
509}
510
511
512
513static int ser12_close(struct net_device *dev)
514{
515 struct baycom_state *bc = netdev_priv(dev);
516
517 if (!dev || !bc)
518 return -EINVAL;
519
520
521
522 outb(0, IER(dev->base_addr));
523 outb(1, MCR(dev->base_addr));
524 free_irq(dev->irq, dev);
525 release_region(dev->base_addr, SER12_EXTENT);
526 printk(KERN_INFO "%s: close ser12 at iobase 0x%lx irq %u\n",
527 bc_drvname, dev->base_addr, dev->irq);
528 return 0;
529}
530
531
532
533
534
535
536
537
538static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
539 struct hdlcdrv_ioctl *hi, int cmd);
540
541
542
543static struct hdlcdrv_ops ser12_ops = {
544 .drvname = bc_drvname,
545 .drvinfo = bc_drvinfo,
546 .open = ser12_open,
547 .close = ser12_close,
548 .ioctl = baycom_ioctl,
549};
550
551
552
553static int baycom_setmode(struct baycom_state *bc, const char *modestr)
554{
555 if (strchr(modestr, '*'))
556 bc->opt_dcd = 0;
557 else if (strchr(modestr, '+'))
558 bc->opt_dcd = -1;
559 else if (strchr(modestr, '@'))
560 bc->opt_dcd = -2;
561 else
562 bc->opt_dcd = 1;
563 return 0;
564}
565
566
567
568static int baycom_ioctl(struct net_device *dev, struct ifreq *ifr,
569 struct hdlcdrv_ioctl *hi, int cmd)
570{
571 struct baycom_state *bc;
572 struct baycom_ioctl bi;
573
574 if (!dev)
575 return -EINVAL;
576
577 bc = netdev_priv(dev);
578 BUG_ON(bc->hdrv.magic != HDLCDRV_MAGIC);
579
580 if (cmd != SIOCDEVPRIVATE)
581 return -ENOIOCTLCMD;
582 switch (hi->cmd) {
583 default:
584 break;
585
586 case HDLCDRVCTL_GETMODE:
587 strcpy(hi->data.modename, "ser12");
588 if (bc->opt_dcd <= 0)
589 strcat(hi->data.modename, (!bc->opt_dcd) ? "*" : (bc->opt_dcd == -2) ? "@" : "+");
590 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
591 return -EFAULT;
592 return 0;
593
594 case HDLCDRVCTL_SETMODE:
595 if (netif_running(dev) || !capable(CAP_NET_ADMIN))
596 return -EACCES;
597 hi->data.modename[sizeof(hi->data.modename)-1] = '\0';
598 return baycom_setmode(bc, hi->data.modename);
599
600 case HDLCDRVCTL_MODELIST:
601 strcpy(hi->data.modename, "ser12");
602 if (copy_to_user(ifr->ifr_data, hi, sizeof(struct hdlcdrv_ioctl)))
603 return -EFAULT;
604 return 0;
605
606 case HDLCDRVCTL_MODEMPARMASK:
607 return HDLCDRV_PARMASK_IOBASE | HDLCDRV_PARMASK_IRQ;
608
609 }
610
611 if (copy_from_user(&bi, ifr->ifr_data, sizeof(bi)))
612 return -EFAULT;
613 switch (bi.cmd) {
614 default:
615 return -ENOIOCTLCMD;
616
617#ifdef BAYCOM_DEBUG
618 case BAYCOMCTL_GETDEBUG:
619 bi.data.dbg.debug1 = bc->hdrv.ptt_keyed;
620 bi.data.dbg.debug2 = bc->debug_vals.last_intcnt;
621 bi.data.dbg.debug3 = bc->debug_vals.last_pllcorr;
622 break;
623#endif
624
625 }
626 if (copy_to_user(ifr->ifr_data, &bi, sizeof(bi)))
627 return -EFAULT;
628 return 0;
629
630}
631
632
633
634
635
636
637static char *mode[NR_PORTS] = { "ser12*", };
638static int iobase[NR_PORTS] = { 0x3f8, };
639static int irq[NR_PORTS] = { 4, };
640
641module_param_array(mode, charp, NULL, 0);
642MODULE_PARM_DESC(mode, "baycom operating mode; * for software DCD");
643module_param_array(iobase, int, NULL, 0);
644MODULE_PARM_DESC(iobase, "baycom io base address");
645module_param_array(irq, int, NULL, 0);
646MODULE_PARM_DESC(irq, "baycom irq number");
647
648MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch, hb9jnx@hb9w.che.eu");
649MODULE_DESCRIPTION("Baycom ser12 half duplex amateur radio modem driver");
650MODULE_LICENSE("GPL");
651
652
653
654static int __init init_baycomserhdx(void)
655{
656 int i, found = 0;
657 char set_hw = 1;
658
659 printk(bc_drvinfo);
660
661
662
663 for (i = 0; i < NR_PORTS; i++) {
664 struct net_device *dev;
665 struct baycom_state *bc;
666 char ifname[IFNAMSIZ];
667
668 sprintf(ifname, "bcsh%d", i);
669
670 if (!mode[i])
671 set_hw = 0;
672 if (!set_hw)
673 iobase[i] = irq[i] = 0;
674
675 dev = hdlcdrv_register(&ser12_ops,
676 sizeof(struct baycom_state),
677 ifname, iobase[i], irq[i], 0);
678 if (IS_ERR(dev))
679 break;
680
681 bc = netdev_priv(dev);
682 if (set_hw && baycom_setmode(bc, mode[i]))
683 set_hw = 0;
684 found++;
685 baycom_device[i] = dev;
686 }
687
688 if (!found)
689 return -ENXIO;
690 return 0;
691}
692
693static void __exit cleanup_baycomserhdx(void)
694{
695 int i;
696
697 for(i = 0; i < NR_PORTS; i++) {
698 struct net_device *dev = baycom_device[i];
699
700 if (dev)
701 hdlcdrv_unregister(dev);
702 }
703}
704
705module_init(init_baycomserhdx);
706module_exit(cleanup_baycomserhdx);
707
708
709
710#ifndef MODULE
711
712
713
714
715
716
717
718
719
720
721static int __init baycom_ser_hdx_setup(char *str)
722{
723 static unsigned nr_dev;
724 int ints[3];
725
726 if (nr_dev >= NR_PORTS)
727 return 0;
728 str = get_options(str, 3, ints);
729 if (ints[0] < 2)
730 return 0;
731 mode[nr_dev] = str;
732 iobase[nr_dev] = ints[1];
733 irq[nr_dev] = ints[2];
734 nr_dev++;
735 return 1;
736}
737
738__setup("baycom_ser_hdx=", baycom_ser_hdx_setup);
739
740#endif
741