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usblp: do not set TASK_INTERRUPTIBLE before lock
[linux/fpc-iii.git] / drivers / net / hamradio / scc.c
blobbc1d5217038985565f05e15fe98b2df4078c4114
1 #define RCS_ID "$Id: scc.c,v 1.75 1998/11/04 15:15:01 jreuter Exp jreuter $"
2
3 #define VERSION "3.0"
4
5 /*
6 * Please use z8530drv-utils-3.0 with this version.
7 * ------------------
8 *
9 * You can find a subset of the documentation in
10 * Documentation/networking/z8530drv.txt.
11 */
12
13 /*
14 ********************************************************************
15 * SCC.C - Linux driver for Z8530 based HDLC cards for AX.25 *
16 ********************************************************************
17
18
19 ********************************************************************
20
21 Copyright (c) 1993, 2000 Joerg Reuter DL1BKE
22
23 portions (c) 1993 Guido ten Dolle PE1NNZ
24
25 ********************************************************************
26
27 The driver and the programs in the archive are UNDER CONSTRUCTION.
28 The code is likely to fail, and so your kernel could --- even
29 a whole network.
30
31 This driver is intended for Amateur Radio use. If you are running it
32 for commercial purposes, please drop me a note. I am nosy...
33
34 ...BUT:
35
36 ! You m u s t recognize the appropriate legislations of your country !
37 ! before you connect a radio to the SCC board and start to transmit or !
38 ! receive. The GPL allows you to use the d r i v e r, NOT the RADIO! !
39
40 For non-Amateur-Radio use please note that you might need a special
41 allowance/licence from the designer of the SCC Board and/or the
42 MODEM.
43
44 This program is free software; you can redistribute it and/or modify
45 it under the terms of the (modified) GNU General Public License
46 delivered with the Linux kernel source.
47
48 This program is distributed in the hope that it will be useful,
49 but WITHOUT ANY WARRANTY; without even the implied warranty of
50 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
51 GNU General Public License for more details.
52
53 You should find a copy of the GNU General Public License in
54 /usr/src/linux/COPYING;
55
56 ********************************************************************
57
58
59 Incomplete history of z8530drv:
60 -------------------------------
61
62 1994-09-13 started to write the driver, rescued most of my own
63 code (and Hans Alblas' memory buffer pool concept) from
64 an earlier project "sccdrv" which was initiated by
65 Guido ten Dolle. Not much of the old driver survived,
66 though. The first version I put my hands on was sccdrv1.3
67 from August 1993. The memory buffer pool concept
68 appeared in an unauthorized sccdrv version (1.5) from
69 August 1994.
70
71 1995-01-31 changed copyright notice to GPL without limitations.
72
73 .
74 . <SNIP>
75 .
76
77 1996-10-05 New semester, new driver...
78
79 * KISS TNC emulator removed (TTY driver)
80 * Source moved to drivers/net/
81 * Includes Z8530 defines from drivers/net/z8530.h
82 * Uses sk_buffer memory management
83 * Reduced overhead of /proc/net/z8530drv output
84 * Streamlined quite a lot things
85 * Invents brand new bugs... ;-)
86
87 The move to version number 3.0 reflects theses changes.
88 You can use 'kissbridge' if you need a KISS TNC emulator.
89
90 1996-12-13 Fixed for Linux networking changes. (G4KLX)
91 1997-01-08 Fixed the remaining problems.
92 1997-04-02 Hopefully fixed the problems with the new *_timer()
93 routines, added calibration code.
94 1997-10-12 Made SCC_DELAY a CONFIG option, added CONFIG_SCC_TRXECHO
95 1998-01-29 Small fix to avoid lock-up on initialization
96 1998-09-29 Fixed the "grouping" bugs, tx_inhibit works again,
97 using dev->tx_queue_len now instead of MAXQUEUE now.
98 1998-10-21 Postponed the spinlock changes, would need a lot of
99 testing I currently don't have the time to. Softdcd doesn't
100 work.
101 1998-11-04 Softdcd does not work correctly in DPLL mode, in fact it
102 never did. The DPLL locks on noise, the SYNC unit sees
103 flags that aren't... Restarting the DPLL does not help
104 either, it resynchronizes too slow and the first received
105 frame gets lost.
106 2000-02-13 Fixed for new network driver interface changes, still
107 does TX timeouts itself since it uses its own queue
108 scheme.
109
110 Thanks to all who contributed to this driver with ideas and bug
111 reports!
112
113 NB -- if you find errors, change something, please let me know
114 first before you distribute it... And please don't touch
115 the version number. Just replace my callsign in
116 "v3.0.dl1bke" with your own. Just to avoid confusion...
117
118 If you want to add your modification to the linux distribution
119 please (!) contact me first.
120
121 New versions of the driver will be announced on the linux-hams
122 mailing list on vger.kernel.org. To subscribe send an e-mail
123 to majordomo@vger.kernel.org with the following line in
124 the body of the mail:
125
126 subscribe linux-hams
127
128 The content of the "Subject" field will be ignored.
129
130 vy 73,
131 Joerg Reuter ampr-net: dl1bke@db0pra.ampr.org
132 AX-25 : DL1BKE @ DB0ABH.#BAY.DEU.EU
133 Internet: jreuter@yaina.de
134 www : http://yaina.de/jreuter
135 */
136
137 /* ----------------------------------------------------------------------- */
138
139 #undef SCC_LDELAY /* slow it even a bit more down */
140 #undef SCC_DONT_CHECK /* don't look if the SCCs you specified are available */
141
142 #define SCC_MAXCHIPS 4 /* number of max. supported chips */
143 #define SCC_BUFSIZE 384 /* must not exceed 4096 */
144 #undef SCC_DEBUG
145
146 #define SCC_DEFAULT_CLOCK 4915200
147 /* default pclock if nothing is specified */
148
149 /* ----------------------------------------------------------------------- */
150
151 #include <linux/module.h>
152 #include <linux/errno.h>
153 #include <linux/signal.h>
154 #include <linux/timer.h>
155 #include <linux/interrupt.h>
156 #include <linux/ioport.h>
157 #include <linux/string.h>
158 #include <linux/in.h>
159 #include <linux/fcntl.h>
160 #include <linux/ptrace.h>
161 #include <linux/delay.h>
162 #include <linux/skbuff.h>
163 #include <linux/netdevice.h>
164 #include <linux/rtnetlink.h>
165 #include <linux/if_ether.h>
166 #include <linux/if_arp.h>
167 #include <linux/socket.h>
168 #include <linux/init.h>
169 #include <linux/scc.h>
170 #include <linux/ctype.h>
171 #include <linux/kernel.h>
172 #include <linux/proc_fs.h>
173 #include <linux/seq_file.h>
174 #include <linux/bitops.h>
175
176 #include <net/net_namespace.h>
177 #include <net/ax25.h>
178
179 #include <asm/irq.h>
180 #include <asm/io.h>
181 #include <asm/uaccess.h>
182
183 #include "z8530.h"
184
185 static const char banner[] __initconst = KERN_INFO \
186 "AX.25: Z8530 SCC driver version "VERSION".dl1bke\n";
187
188 static void t_dwait(unsigned long);
189 static void t_txdelay(unsigned long);
190 static void t_tail(unsigned long);
191 static void t_busy(unsigned long);
192 static void t_maxkeyup(unsigned long);
193 static void t_idle(unsigned long);
194 static void scc_tx_done(struct scc_channel *);
195 static void scc_start_tx_timer(struct scc_channel *, void (*)(unsigned long), unsigned long);
196 static void scc_start_maxkeyup(struct scc_channel *);
197 static void scc_start_defer(struct scc_channel *);
198
199 static void z8530_init(void);
200
201 static void init_channel(struct scc_channel *scc);
202 static void scc_key_trx (struct scc_channel *scc, char tx);
203 static void scc_init_timer(struct scc_channel *scc);
204
205 static int scc_net_alloc(const char *name, struct scc_channel *scc);
206 static void scc_net_setup(struct net_device *dev);
207 static int scc_net_open(struct net_device *dev);
208 static int scc_net_close(struct net_device *dev);
209 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb);
210 static netdev_tx_t scc_net_tx(struct sk_buff *skb,
211 struct net_device *dev);
212 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
213 static int scc_net_set_mac_address(struct net_device *dev, void *addr);
214 static struct net_device_stats * scc_net_get_stats(struct net_device *dev);
215
216 static unsigned char SCC_DriverName[] = "scc";
217
218 static struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS];
219
220 static struct scc_channel SCC_Info[2 * SCC_MAXCHIPS]; /* information per channel */
221
222 static struct scc_ctrl {
223 io_port chan_A;
224 io_port chan_B;
225 int irq;
226 } SCC_ctrl[SCC_MAXCHIPS+1];
227
228 static unsigned char Driver_Initialized;
229 static int Nchips;
230 static io_port Vector_Latch;
231
232
233 /* ******************************************************************** */
234 /* * Port Access Functions * */
235 /* ******************************************************************** */
236
237 /* These provide interrupt save 2-step access to the Z8530 registers */
238
239 static DEFINE_SPINLOCK(iolock); /* Guards paired accesses */
240
241 static inline unsigned char InReg(io_port port, unsigned char reg)
242 {
243 unsigned long flags;
244 unsigned char r;
245
246 spin_lock_irqsave(&iolock, flags);
247 #ifdef SCC_LDELAY
248 Outb(port, reg);
249 udelay(SCC_LDELAY);
250 r=Inb(port);
251 udelay(SCC_LDELAY);
252 #else
253 Outb(port, reg);
254 r=Inb(port);
255 #endif
256 spin_unlock_irqrestore(&iolock, flags);
257 return r;
258 }
259
260 static inline void OutReg(io_port port, unsigned char reg, unsigned char val)
261 {
262 unsigned long flags;
263
264 spin_lock_irqsave(&iolock, flags);
265 #ifdef SCC_LDELAY
266 Outb(port, reg); udelay(SCC_LDELAY);
267 Outb(port, val); udelay(SCC_LDELAY);
268 #else
269 Outb(port, reg);
270 Outb(port, val);
271 #endif
272 spin_unlock_irqrestore(&iolock, flags);
273 }
274
275 static inline void wr(struct scc_channel *scc, unsigned char reg,
276 unsigned char val)
277 {
278 OutReg(scc->ctrl, reg, (scc->wreg[reg] = val));
279 }
280
281 static inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val)
282 {
283 OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val));
284 }
285
286 static inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val)
287 {
288 OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val));
289 }
290
291 /* ******************************************************************** */
292 /* * Some useful macros * */
293 /* ******************************************************************** */
294
295 static inline void scc_discard_buffers(struct scc_channel *scc)
296 {
297 unsigned long flags;
298
299 spin_lock_irqsave(&scc->lock, flags);
300 if (scc->tx_buff != NULL)
301 {
302 dev_kfree_skb(scc->tx_buff);
303 scc->tx_buff = NULL;
304 }
305
306 while (!skb_queue_empty(&scc->tx_queue))
307 dev_kfree_skb(skb_dequeue(&scc->tx_queue));
308
309 spin_unlock_irqrestore(&scc->lock, flags);
310 }
311
312
313
314 /* ******************************************************************** */
315 /* * Interrupt Service Routines * */
316 /* ******************************************************************** */
317
318
319 /* ----> subroutines for the interrupt handlers <---- */
320
321 static inline void scc_notify(struct scc_channel *scc, int event)
322 {
323 struct sk_buff *skb;
324 char *bp;
325
326 if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA)
327 return;
328
329 skb = dev_alloc_skb(2);
330 if (skb != NULL)
331 {
332 bp = skb_put(skb, 2);
333 *bp++ = PARAM_HWEVENT;
334 *bp++ = event;
335 scc_net_rx(scc, skb);
336 } else
337 scc->stat.nospace++;
338 }
339
340 static inline void flush_rx_FIFO(struct scc_channel *scc)
341 {
342 int k;
343
344 for (k=0; k<3; k++)
345 Inb(scc->data);
346
347 if(scc->rx_buff != NULL) /* did we receive something? */
348 {
349 scc->stat.rxerrs++; /* then count it as an error */
350 dev_kfree_skb_irq(scc->rx_buff);
351 scc->rx_buff = NULL;
352 }
353 }
354
355 static void start_hunt(struct scc_channel *scc)
356 {
357 if ((scc->modem.clocksrc != CLK_EXTERNAL))
358 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
359 or(scc,R3,ENT_HM|RxENABLE); /* enable the receiver, hunt mode */
360 }
361
362 /* ----> four different interrupt handlers for Tx, Rx, changing of */
363 /* DCD/CTS and Rx/Tx errors */
364
365 /* Transmitter interrupt handler */
366 static inline void scc_txint(struct scc_channel *scc)
367 {
368 struct sk_buff *skb;
369
370 scc->stat.txints++;
371 skb = scc->tx_buff;
372
373 /* send first octet */
374
375 if (skb == NULL)
376 {
377 skb = skb_dequeue(&scc->tx_queue);
378 scc->tx_buff = skb;
379 netif_wake_queue(scc->dev);
380
381 if (skb == NULL)
382 {
383 scc_tx_done(scc);
384 Outb(scc->ctrl, RES_Tx_P);
385 return;
386 }
387
388 if (skb->len == 0) /* Paranoia... */
389 {
390 dev_kfree_skb_irq(skb);
391 scc->tx_buff = NULL;
392 scc_tx_done(scc);
393 Outb(scc->ctrl, RES_Tx_P);
394 return;
395 }
396
397 scc->stat.tx_state = TXS_ACTIVE;
398
399 OutReg(scc->ctrl, R0, RES_Tx_CRC);
400 /* reset CRC generator */
401 or(scc,R10,ABUNDER); /* re-install underrun protection */
402 Outb(scc->data,*skb->data); /* send byte */
403 skb_pull(skb, 1);
404
405 if (!scc->enhanced) /* reset EOM latch */
406 Outb(scc->ctrl,RES_EOM_L);
407 return;
408 }
409
410 /* End Of Frame... */
411
412 if (skb->len == 0)
413 {
414 Outb(scc->ctrl, RES_Tx_P); /* reset pending int */
415 cl(scc, R10, ABUNDER); /* send CRC */
416 dev_kfree_skb_irq(skb);
417 scc->tx_buff = NULL;
418 scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */
419 return;
420 }
421
422 /* send octet */
423
424 Outb(scc->data,*skb->data);
425 skb_pull(skb, 1);
426 }
427
428
429 /* External/Status interrupt handler */
430 static inline void scc_exint(struct scc_channel *scc)
431 {
432 unsigned char status,changes,chg_and_stat;
433
434 scc->stat.exints++;
435
436 status = InReg(scc->ctrl,R0);
437 changes = status ^ scc->status;
438 chg_and_stat = changes & status;
439
440 /* ABORT: generated whenever DCD drops while receiving */
441
442 if (chg_and_stat & BRK_ABRT) /* Received an ABORT */
443 flush_rx_FIFO(scc);
444
445 /* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */
446
447 if ((changes & SYNC_HUNT) && scc->kiss.softdcd)
448 {
449 if (status & SYNC_HUNT)
450 {
451 scc->dcd = 0;
452 flush_rx_FIFO(scc);
453 if ((scc->modem.clocksrc != CLK_EXTERNAL))
454 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
455 } else {
456 scc->dcd = 1;
457 }
458
459 scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON);
460 }
461
462 /* DCD: on = start to receive packet, off = ABORT condition */
463 /* (a successfully received packet generates a special condition int) */
464
465 if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */
466 {
467 if(status & DCD) /* DCD is now ON */
468 {
469 start_hunt(scc);
470 scc->dcd = 1;
471 } else { /* DCD is now OFF */
472 cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */
473 flush_rx_FIFO(scc);
474 scc->dcd = 0;
475 }
476
477 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
478 }
479
480 #ifdef notdef
481 /* CTS: use external TxDelay (what's that good for?!)
482 * Anyway: If we _could_ use it (BayCom USCC uses CTS for
483 * own purposes) we _should_ use the "autoenable" feature
484 * of the Z8530 and not this interrupt...
485 */
486
487 if (chg_and_stat & CTS) /* CTS is now ON */
488 {
489 if (scc->kiss.txdelay == 0) /* zero TXDELAY = wait for CTS */
490 scc_start_tx_timer(scc, t_txdelay, 0);
491 }
492 #endif
493
494 if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM))
495 {
496 scc->stat.tx_under++; /* oops, an underrun! count 'em */
497 Outb(scc->ctrl, RES_EXT_INT); /* reset ext/status interrupts */
498
499 if (scc->tx_buff != NULL)
500 {
501 dev_kfree_skb_irq(scc->tx_buff);
502 scc->tx_buff = NULL;
503 }
504
505 or(scc,R10,ABUNDER);
506 scc_start_tx_timer(scc, t_txdelay, 0); /* restart transmission */
507 }
508
509 scc->status = status;
510 Outb(scc->ctrl,RES_EXT_INT);
511 }
512
513
514 /* Receiver interrupt handler */
515 static inline void scc_rxint(struct scc_channel *scc)
516 {
517 struct sk_buff *skb;
518
519 scc->stat.rxints++;
520
521 if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF)
522 {
523 Inb(scc->data); /* discard char */
524 or(scc,R3,ENT_HM); /* enter hunt mode for next flag */
525 return;
526 }
527
528 skb = scc->rx_buff;
529
530 if (skb == NULL)
531 {
532 skb = dev_alloc_skb(scc->stat.bufsize);
533 if (skb == NULL)
534 {
535 scc->dev_stat.rx_dropped++;
536 scc->stat.nospace++;
537 Inb(scc->data);
538 or(scc, R3, ENT_HM);
539 return;
540 }
541
542 scc->rx_buff = skb;
543 *(skb_put(skb, 1)) = 0; /* KISS data */
544 }
545
546 if (skb->len >= scc->stat.bufsize)
547 {
548 #ifdef notdef
549 printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n");
550 #endif
551 dev_kfree_skb_irq(skb);
552 scc->rx_buff = NULL;
553 Inb(scc->data);
554 or(scc, R3, ENT_HM);
555 return;
556 }
557
558 *(skb_put(skb, 1)) = Inb(scc->data);
559 }
560
561
562 /* Receive Special Condition interrupt handler */
563 static inline void scc_spint(struct scc_channel *scc)
564 {
565 unsigned char status;
566 struct sk_buff *skb;
567
568 scc->stat.spints++;
569
570 status = InReg(scc->ctrl,R1); /* read receiver status */
571
572 Inb(scc->data); /* throw away Rx byte */
573 skb = scc->rx_buff;
574
575 if(status & Rx_OVR) /* receiver overrun */
576 {
577 scc->stat.rx_over++; /* count them */
578 or(scc,R3,ENT_HM); /* enter hunt mode for next flag */
579
580 if (skb != NULL)
581 dev_kfree_skb_irq(skb);
582 scc->rx_buff = skb = NULL;
583 }
584
585 if(status & END_FR && skb != NULL) /* end of frame */
586 {
587 /* CRC okay, frame ends on 8 bit boundary and received something ? */
588
589 if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0)
590 {
591 /* ignore last received byte (first of the CRC bytes) */
592 skb_trim(skb, skb->len-1);
593 scc_net_rx(scc, skb);
594 scc->rx_buff = NULL;
595 scc->stat.rxframes++;
596 } else { /* a bad frame */
597 dev_kfree_skb_irq(skb);
598 scc->rx_buff = NULL;
599 scc->stat.rxerrs++;
600 }
601 }
602
603 Outb(scc->ctrl,ERR_RES);
604 }
605
606
607 /* ----> interrupt service routine for the Z8530 <---- */
608
609 static void scc_isr_dispatch(struct scc_channel *scc, int vector)
610 {
611 spin_lock(&scc->lock);
612 switch (vector & VECTOR_MASK)
613 {
614 case TXINT: scc_txint(scc); break;
615 case EXINT: scc_exint(scc); break;
616 case RXINT: scc_rxint(scc); break;
617 case SPINT: scc_spint(scc); break;
618 }
619 spin_unlock(&scc->lock);
620 }
621
622 /* If the card has a latch for the interrupt vector (like the PA0HZP card)
623 use it to get the number of the chip that generated the int.
624 If not: poll all defined chips.
625 */
626
627 #define SCC_IRQTIMEOUT 30000
628
629 static irqreturn_t scc_isr(int irq, void *dev_id)
630 {
631 int chip_irq = (long) dev_id;
632 unsigned char vector;
633 struct scc_channel *scc;
634 struct scc_ctrl *ctrl;
635 int k;
636
637 if (Vector_Latch)
638 {
639 for(k=0; k < SCC_IRQTIMEOUT; k++)
640 {
641 Outb(Vector_Latch, 0); /* Generate INTACK */
642
643 /* Read the vector */
644 if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break;
645 if (vector & 0x01) break;
646
647 scc=&SCC_Info[vector >> 3 ^ 0x01];
648 if (!scc->dev) break;
649
650 scc_isr_dispatch(scc, vector);
651
652 OutReg(scc->ctrl,R0,RES_H_IUS); /* Reset Highest IUS */
653 }
654
655 if (k == SCC_IRQTIMEOUT)
656 printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n");
657
658 return IRQ_HANDLED;
659 }
660
661 /* Find the SCC generating the interrupt by polling all attached SCCs
662 * reading RR3A (the interrupt pending register)
663 */
664
665 ctrl = SCC_ctrl;
666 while (ctrl->chan_A)
667 {
668 if (ctrl->irq != chip_irq)
669 {
670 ctrl++;
671 continue;
672 }
673
674 scc = NULL;
675 for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++)
676 {
677 vector=InReg(ctrl->chan_B,R2); /* Read the vector */
678 if (vector & 0x01) break;
679
680 scc = &SCC_Info[vector >> 3 ^ 0x01];
681 if (!scc->dev) break;
682
683 scc_isr_dispatch(scc, vector);
684 }
685
686 if (k == SCC_IRQTIMEOUT)
687 {
688 printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n");
689 break;
690 }
691
692 /* This looks weird and it is. At least the BayCom USCC doesn't
693 * use the Interrupt Daisy Chain, thus we'll have to start
694 * all over again to be sure not to miss an interrupt from
695 * (any of) the other chip(s)...
696 * Honestly, the situation *is* braindamaged...
697 */
698
699 if (scc != NULL)
700 {
701 OutReg(scc->ctrl,R0,RES_H_IUS);
702 ctrl = SCC_ctrl;
703 } else
704 ctrl++;
705 }
706 return IRQ_HANDLED;
707 }
708
709
710
711 /* ******************************************************************** */
712 /* * Init Channel */
713 /* ******************************************************************** */
714
715
716 /* ----> set SCC channel speed <---- */
717
718 static inline void set_brg(struct scc_channel *scc, unsigned int tc)
719 {
720 cl(scc,R14,BRENABL); /* disable baudrate generator */
721 wr(scc,R12,tc & 255); /* brg rate LOW */
722 wr(scc,R13,tc >> 8); /* brg rate HIGH */
723 or(scc,R14,BRENABL); /* enable baudrate generator */
724 }
725
726 static inline void set_speed(struct scc_channel *scc)
727 {
728 unsigned long flags;
729 spin_lock_irqsave(&scc->lock, flags);
730
731 if (scc->modem.speed > 0) /* paranoia... */
732 set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2);
733
734 spin_unlock_irqrestore(&scc->lock, flags);
735 }
736
737
738 /* ----> initialize a SCC channel <---- */
739
740 static inline void init_brg(struct scc_channel *scc)
741 {
742 wr(scc, R14, BRSRC); /* BRG source = PCLK */
743 OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]); /* DPLL source = BRG */
744 OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]); /* DPLL NRZI mode */
745 }
746
747 /*
748 * Initialization according to the Z8530 manual (SGS-Thomson's version):
749 *
750 * 1. Modes and constants
751 *
752 * WR9 11000000 chip reset
753 * WR4 XXXXXXXX Tx/Rx control, async or sync mode
754 * WR1 0XX00X00 select W/REQ (optional)
755 * WR2 XXXXXXXX program interrupt vector
756 * WR3 XXXXXXX0 select Rx control
757 * WR5 XXXX0XXX select Tx control
758 * WR6 XXXXXXXX sync character
759 * WR7 XXXXXXXX sync character
760 * WR9 000X0XXX select interrupt control
761 * WR10 XXXXXXXX miscellaneous control (optional)
762 * WR11 XXXXXXXX clock control
763 * WR12 XXXXXXXX time constant lower byte (optional)
764 * WR13 XXXXXXXX time constant upper byte (optional)
765 * WR14 XXXXXXX0 miscellaneous control
766 * WR14 XXXSSSSS commands (optional)
767 *
768 * 2. Enables
769 *
770 * WR14 000SSSS1 baud rate enable
771 * WR3 SSSSSSS1 Rx enable
772 * WR5 SSSS1SSS Tx enable
773 * WR0 10000000 reset Tx CRG (optional)
774 * WR1 XSS00S00 DMA enable (optional)
775 *
776 * 3. Interrupt status
777 *
778 * WR15 XXXXXXXX enable external/status
779 * WR0 00010000 reset external status
780 * WR0 00010000 reset external status twice
781 * WR1 SSSXXSXX enable Rx, Tx and Ext/status
782 * WR9 000SXSSS enable master interrupt enable
783 *
784 * 1 = set to one, 0 = reset to zero
785 * X = user defined, S = same as previous init
786 *
787 *
788 * Note that the implementation differs in some points from above scheme.
789 *
790 */
791
792 static void init_channel(struct scc_channel *scc)
793 {
794 del_timer(&scc->tx_t);
795 del_timer(&scc->tx_wdog);
796
797 disable_irq(scc->irq);
798
799 wr(scc,R4,X1CLK|SDLC); /* *1 clock, SDLC mode */
800 wr(scc,R1,0); /* no W/REQ operation */
801 wr(scc,R3,Rx8|RxCRC_ENAB); /* RX 8 bits/char, CRC, disabled */
802 wr(scc,R5,Tx8|DTR|TxCRC_ENAB); /* TX 8 bits/char, disabled, DTR */
803 wr(scc,R6,0); /* SDLC address zero (not used) */
804 wr(scc,R7,FLAG); /* SDLC flag value */
805 wr(scc,R9,VIS); /* vector includes status */
806 wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */
807 wr(scc,R14, 0);
808
809
810 /* set clock sources:
811
812 CLK_DPLL: normal halfduplex operation
813
814 RxClk: use DPLL
815 TxClk: use DPLL
816 TRxC mode DPLL output
817
818 CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem)
819
820 BayCom: others:
821
822 TxClk = pin RTxC TxClk = pin TRxC
823 RxClk = pin TRxC RxClk = pin RTxC
824
825
826 CLK_DIVIDER:
827 RxClk = use DPLL
828 TxClk = pin RTxC
829
830 BayCom: others:
831 pin TRxC = DPLL pin TRxC = BRG
832 (RxClk * 1) (RxClk * 32)
833 */
834
835
836 switch(scc->modem.clocksrc)
837 {
838 case CLK_DPLL:
839 wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
840 init_brg(scc);
841 break;
842
843 case CLK_DIVIDER:
844 wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI);
845 init_brg(scc);
846 break;
847
848 case CLK_EXTERNAL:
849 wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP);
850 OutReg(scc->ctrl, R14, DISDPLL);
851 break;
852
853 }
854
855 set_speed(scc); /* set baudrate */
856
857 if(scc->enhanced)
858 {
859 or(scc,R15,SHDLCE|FIFOE); /* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */
860 wr(scc,R7,AUTOEOM);
861 }
862
863 if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD))
864 /* DCD is now ON */
865 {
866 start_hunt(scc);
867 }
868
869 /* enable ABORT, DCD & SYNC/HUNT interrupts */
870
871 wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE));
872
873 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
874 Outb(scc->ctrl,RES_EXT_INT); /* must be done twice */
875
876 or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */
877
878 scc->status = InReg(scc->ctrl,R0); /* read initial status */
879
880 or(scc,R9,MIE); /* master interrupt enable */
881
882 scc_init_timer(scc);
883
884 enable_irq(scc->irq);
885 }
886
887
888
889
890 /* ******************************************************************** */
891 /* * SCC timer functions * */
892 /* ******************************************************************** */
893
894
895 /* ----> scc_key_trx sets the time constant for the baudrate
896 generator and keys the transmitter <---- */
897
898 static void scc_key_trx(struct scc_channel *scc, char tx)
899 {
900 unsigned int time_const;
901
902 if (scc->brand & PRIMUS)
903 Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0));
904
905 if (scc->modem.speed < 300)
906 scc->modem.speed = 1200;
907
908 time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2;
909
910 disable_irq(scc->irq);
911
912 if (tx)
913 {
914 or(scc, R1, TxINT_ENAB); /* t_maxkeyup may have reset these */
915 or(scc, R15, TxUIE);
916 }
917
918 if (scc->modem.clocksrc == CLK_DPLL)
919 { /* force simplex operation */
920 if (tx)
921 {
922 #ifdef CONFIG_SCC_TRXECHO
923 cl(scc, R3, RxENABLE|ENT_HM); /* switch off receiver */
924 cl(scc, R15, DCDIE|SYNCIE); /* No DCD changes, please */
925 #endif
926 set_brg(scc, time_const); /* reprogram baudrate generator */
927
928 /* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */
929 wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR);
930
931 /* By popular demand: tx_inhibit */
932 if (scc->kiss.tx_inhibit)
933 {
934 or(scc,R5, TxENAB);
935 scc->wreg[R5] |= RTS;
936 } else {
937 or(scc,R5,RTS|TxENAB); /* set the RTS line and enable TX */
938 }
939 } else {
940 cl(scc,R5,RTS|TxENAB);
941
942 set_brg(scc, time_const); /* reprogram baudrate generator */
943
944 /* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */
945 wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
946
947 #ifndef CONFIG_SCC_TRXECHO
948 if (scc->kiss.softdcd)
949 #endif
950 {
951 or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE);
952 start_hunt(scc);
953 }
954 }
955 } else {
956 if (tx)
957 {
958 #ifdef CONFIG_SCC_TRXECHO
959 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
960 {
961 cl(scc, R3, RxENABLE);
962 cl(scc, R15, DCDIE|SYNCIE);
963 }
964 #endif
965
966 if (scc->kiss.tx_inhibit)
967 {
968 or(scc,R5, TxENAB);
969 scc->wreg[R5] |= RTS;
970 } else {
971 or(scc,R5,RTS|TxENAB); /* enable tx */
972 }
973 } else {
974 cl(scc,R5,RTS|TxENAB); /* disable tx */
975
976 if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) &&
977 #ifndef CONFIG_SCC_TRXECHO
978 scc->kiss.softdcd)
979 #else
980 1)
981 #endif
982 {
983 or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE);
984 start_hunt(scc);
985 }
986 }
987 }
988
989 enable_irq(scc->irq);
990 }
991
992
993 /* ----> SCC timer interrupt handler and friends. <---- */
994
995 static void __scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
996 {
997 del_timer(&scc->tx_t);
998
999 if (when == 0)
1000 {
1001 handler((unsigned long) scc);
1002 } else
1003 if (when != TIMER_OFF)
1004 {
1005 scc->tx_t.data = (unsigned long) scc;
1006 scc->tx_t.function = handler;
1007 scc->tx_t.expires = jiffies + (when*HZ)/100;
1008 add_timer(&scc->tx_t);
1009 }
1010 }
1011
1012 static void scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
1013 {
1014 unsigned long flags;
1015
1016 spin_lock_irqsave(&scc->lock, flags);
1017 __scc_start_tx_timer(scc, handler, when);
1018 spin_unlock_irqrestore(&scc->lock, flags);
1019 }
1020
1021 static void scc_start_defer(struct scc_channel *scc)
1022 {
1023 unsigned long flags;
1024
1025 spin_lock_irqsave(&scc->lock, flags);
1026 del_timer(&scc->tx_wdog);
1027
1028 if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF)
1029 {
1030 scc->tx_wdog.data = (unsigned long) scc;
1031 scc->tx_wdog.function = t_busy;
1032 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer;
1033 add_timer(&scc->tx_wdog);
1034 }
1035 spin_unlock_irqrestore(&scc->lock, flags);
1036 }
1037
1038 static void scc_start_maxkeyup(struct scc_channel *scc)
1039 {
1040 unsigned long flags;
1041
1042 spin_lock_irqsave(&scc->lock, flags);
1043 del_timer(&scc->tx_wdog);
1044
1045 if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF)
1046 {
1047 scc->tx_wdog.data = (unsigned long) scc;
1048 scc->tx_wdog.function = t_maxkeyup;
1049 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup;
1050 add_timer(&scc->tx_wdog);
1051 }
1052 spin_unlock_irqrestore(&scc->lock, flags);
1053 }
1054
1055 /*
1056 * This is called from scc_txint() when there are no more frames to send.
1057 * Not exactly a timer function, but it is a close friend of the family...
1058 */
1059
1060 static void scc_tx_done(struct scc_channel *scc)
1061 {
1062 /*
1063 * trx remains keyed in fulldup mode 2 until t_idle expires.
1064 */
1065
1066 switch (scc->kiss.fulldup)
1067 {
1068 case KISS_DUPLEX_LINK:
1069 scc->stat.tx_state = TXS_IDLE2;
1070 if (scc->kiss.idletime != TIMER_OFF)
1071 scc_start_tx_timer(scc, t_idle,
1072 scc->kiss.idletime*100);
1073 break;
1074 case KISS_DUPLEX_OPTIMA:
1075 scc_notify(scc, HWEV_ALL_SENT);
1076 break;
1077 default:
1078 scc->stat.tx_state = TXS_BUSY;
1079 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1080 }
1081
1082 netif_wake_queue(scc->dev);
1083 }
1084
1085
1086 static unsigned char Rand = 17;
1087
1088 static inline int is_grouped(struct scc_channel *scc)
1089 {
1090 int k;
1091 struct scc_channel *scc2;
1092 unsigned char grp1, grp2;
1093
1094 grp1 = scc->kiss.group;
1095
1096 for (k = 0; k < (Nchips * 2); k++)
1097 {
1098 scc2 = &SCC_Info[k];
1099 grp2 = scc2->kiss.group;
1100
1101 if (scc2 == scc || !(scc2->dev && grp2))
1102 continue;
1103
1104 if ((grp1 & 0x3f) == (grp2 & 0x3f))
1105 {
1106 if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) )
1107 return 1;
1108
1109 if ( (grp1 & RXGROUP) && scc2->dcd )
1110 return 1;
1111 }
1112 }
1113 return 0;
1114 }
1115
1116 /* DWAIT and SLOTTIME expired
1117 *
1118 * fulldup == 0: DCD is active or Rand > P-persistence: start t_busy timer
1119 * else key trx and start txdelay
1120 * fulldup == 1: key trx and start txdelay
1121 * fulldup == 2: mintime expired, reset status or key trx and start txdelay
1122 */
1123
1124 static void t_dwait(unsigned long channel)
1125 {
1126 struct scc_channel *scc = (struct scc_channel *) channel;
1127
1128 if (scc->stat.tx_state == TXS_WAIT) /* maxkeyup or idle timeout */
1129 {
1130 if (skb_queue_empty(&scc->tx_queue)) { /* nothing to send */
1131 scc->stat.tx_state = TXS_IDLE;
1132 netif_wake_queue(scc->dev); /* t_maxkeyup locked it. */
1133 return;
1134 }
1135
1136 scc->stat.tx_state = TXS_BUSY;
1137 }
1138
1139 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1140 {
1141 Rand = Rand * 17 + 31;
1142
1143 if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) )
1144 {
1145 scc_start_defer(scc);
1146 scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime);
1147 return ;
1148 }
1149 }
1150
1151 if ( !(scc->wreg[R5] & RTS) )
1152 {
1153 scc_key_trx(scc, TX_ON);
1154 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1155 } else {
1156 scc_start_tx_timer(scc, t_txdelay, 0);
1157 }
1158 }
1159
1160
1161 /* TXDELAY expired
1162 *
1163 * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog.
1164 */
1165
1166 static void t_txdelay(unsigned long channel)
1167 {
1168 struct scc_channel *scc = (struct scc_channel *) channel;
1169
1170 scc_start_maxkeyup(scc);
1171
1172 if (scc->tx_buff == NULL)
1173 {
1174 disable_irq(scc->irq);
1175 scc_txint(scc);
1176 enable_irq(scc->irq);
1177 }
1178 }
1179
1180
1181 /* TAILTIME expired
1182 *
1183 * switch off transmitter. If we were stopped by Maxkeyup restart
1184 * transmission after 'mintime' seconds
1185 */
1186
1187 static void t_tail(unsigned long channel)
1188 {
1189 struct scc_channel *scc = (struct scc_channel *) channel;
1190 unsigned long flags;
1191
1192 spin_lock_irqsave(&scc->lock, flags);
1193 del_timer(&scc->tx_wdog);
1194 scc_key_trx(scc, TX_OFF);
1195 spin_unlock_irqrestore(&scc->lock, flags);
1196
1197 if (scc->stat.tx_state == TXS_TIMEOUT) /* we had a timeout? */
1198 {
1199 scc->stat.tx_state = TXS_WAIT;
1200 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1201 return;
1202 }
1203
1204 scc->stat.tx_state = TXS_IDLE;
1205 netif_wake_queue(scc->dev);
1206 }
1207
1208
1209 /* BUSY timeout
1210 *
1211 * throw away send buffers if DCD remains active too long.
1212 */
1213
1214 static void t_busy(unsigned long channel)
1215 {
1216 struct scc_channel *scc = (struct scc_channel *) channel;
1217
1218 del_timer(&scc->tx_t);
1219 netif_stop_queue(scc->dev); /* don't pile on the wabbit! */
1220
1221 scc_discard_buffers(scc);
1222 scc->stat.txerrs++;
1223 scc->stat.tx_state = TXS_IDLE;
1224
1225 netif_wake_queue(scc->dev);
1226 }
1227
1228 /* MAXKEYUP timeout
1229 *
1230 * this is our watchdog.
1231 */
1232
1233 static void t_maxkeyup(unsigned long channel)
1234 {
1235 struct scc_channel *scc = (struct scc_channel *) channel;
1236 unsigned long flags;
1237
1238 spin_lock_irqsave(&scc->lock, flags);
1239 /*
1240 * let things settle down before we start to
1241 * accept new data.
1242 */
1243
1244 netif_stop_queue(scc->dev);
1245 scc_discard_buffers(scc);
1246
1247 del_timer(&scc->tx_t);
1248
1249 cl(scc, R1, TxINT_ENAB); /* force an ABORT, but don't */
1250 cl(scc, R15, TxUIE); /* count it. */
1251 OutReg(scc->ctrl, R0, RES_Tx_P);
1252
1253 spin_unlock_irqrestore(&scc->lock, flags);
1254
1255 scc->stat.txerrs++;
1256 scc->stat.tx_state = TXS_TIMEOUT;
1257 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1258 }
1259
1260 /* IDLE timeout
1261 *
1262 * in fulldup mode 2 it keys down the transmitter after 'idle' seconds
1263 * of inactivity. We will not restart transmission before 'mintime'
1264 * expires.
1265 */
1266
1267 static void t_idle(unsigned long channel)
1268 {
1269 struct scc_channel *scc = (struct scc_channel *) channel;
1270
1271 del_timer(&scc->tx_wdog);
1272
1273 scc_key_trx(scc, TX_OFF);
1274 if(scc->kiss.mintime)
1275 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1276 scc->stat.tx_state = TXS_WAIT;
1277 }
1278
1279 static void scc_init_timer(struct scc_channel *scc)
1280 {
1281 unsigned long flags;
1282
1283 spin_lock_irqsave(&scc->lock, flags);
1284 scc->stat.tx_state = TXS_IDLE;
1285 spin_unlock_irqrestore(&scc->lock, flags);
1286 }
1287
1288
1289 /* ******************************************************************** */
1290 /* * Set/get L1 parameters * */
1291 /* ******************************************************************** */
1292
1293
1294 /*
1295 * this will set the "hardware" parameters through KISS commands or ioctl()
1296 */
1297
1298 #define CAST(x) (unsigned long)(x)
1299
1300 static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg)
1301 {
1302 switch (cmd)
1303 {
1304 case PARAM_TXDELAY: scc->kiss.txdelay=arg; break;
1305 case PARAM_PERSIST: scc->kiss.persist=arg; break;
1306 case PARAM_SLOTTIME: scc->kiss.slottime=arg; break;
1307 case PARAM_TXTAIL: scc->kiss.tailtime=arg; break;
1308 case PARAM_FULLDUP: scc->kiss.fulldup=arg; break;
1309 case PARAM_DTR: break; /* does someone need this? */
1310 case PARAM_GROUP: scc->kiss.group=arg; break;
1311 case PARAM_IDLE: scc->kiss.idletime=arg; break;
1312 case PARAM_MIN: scc->kiss.mintime=arg; break;
1313 case PARAM_MAXKEY: scc->kiss.maxkeyup=arg; break;
1314 case PARAM_WAIT: scc->kiss.waittime=arg; break;
1315 case PARAM_MAXDEFER: scc->kiss.maxdefer=arg; break;
1316 case PARAM_TX: scc->kiss.tx_inhibit=arg; break;
1317
1318 case PARAM_SOFTDCD:
1319 scc->kiss.softdcd=arg;
1320 if (arg)
1321 {
1322 or(scc, R15, SYNCIE);
1323 cl(scc, R15, DCDIE);
1324 start_hunt(scc);
1325 } else {
1326 or(scc, R15, DCDIE);
1327 cl(scc, R15, SYNCIE);
1328 }
1329 break;
1330
1331 case PARAM_SPEED:
1332 if (arg < 256)
1333 scc->modem.speed=arg*100;
1334 else
1335 scc->modem.speed=arg;
1336
1337 if (scc->stat.tx_state == 0) /* only switch baudrate on rx... ;-) */
1338 set_speed(scc);
1339 break;
1340
1341 case PARAM_RTS:
1342 if ( !(scc->wreg[R5] & RTS) )
1343 {
1344 if (arg != TX_OFF) {
1345 scc_key_trx(scc, TX_ON);
1346 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1347 }
1348 } else {
1349 if (arg == TX_OFF)
1350 {
1351 scc->stat.tx_state = TXS_BUSY;
1352 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1353 }
1354 }
1355 break;
1356
1357 case PARAM_HWEVENT:
1358 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1359 break;
1360
1361 default: return -EINVAL;
1362 }
1363
1364 return 0;
1365 }
1366
1367
1368
1369 static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1370 {
1371 switch (cmd)
1372 {
1373 case PARAM_TXDELAY: return CAST(scc->kiss.txdelay);
1374 case PARAM_PERSIST: return CAST(scc->kiss.persist);
1375 case PARAM_SLOTTIME: return CAST(scc->kiss.slottime);
1376 case PARAM_TXTAIL: return CAST(scc->kiss.tailtime);
1377 case PARAM_FULLDUP: return CAST(scc->kiss.fulldup);
1378 case PARAM_SOFTDCD: return CAST(scc->kiss.softdcd);
1379 case PARAM_DTR: return CAST((scc->wreg[R5] & DTR)? 1:0);
1380 case PARAM_RTS: return CAST((scc->wreg[R5] & RTS)? 1:0);
1381 case PARAM_SPEED: return CAST(scc->modem.speed);
1382 case PARAM_GROUP: return CAST(scc->kiss.group);
1383 case PARAM_IDLE: return CAST(scc->kiss.idletime);
1384 case PARAM_MIN: return CAST(scc->kiss.mintime);
1385 case PARAM_MAXKEY: return CAST(scc->kiss.maxkeyup);
1386 case PARAM_WAIT: return CAST(scc->kiss.waittime);
1387 case PARAM_MAXDEFER: return CAST(scc->kiss.maxdefer);
1388 case PARAM_TX: return CAST(scc->kiss.tx_inhibit);
1389 default: return NO_SUCH_PARAM;
1390 }
1391
1392 }
1393
1394 #undef CAST
1395
1396 /* ******************************************************************* */
1397 /* * Send calibration pattern * */
1398 /* ******************************************************************* */
1399
1400 static void scc_stop_calibrate(unsigned long channel)
1401 {
1402 struct scc_channel *scc = (struct scc_channel *) channel;
1403 unsigned long flags;
1404
1405 spin_lock_irqsave(&scc->lock, flags);
1406 del_timer(&scc->tx_wdog);
1407 scc_key_trx(scc, TX_OFF);
1408 wr(scc, R6, 0);
1409 wr(scc, R7, FLAG);
1410 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1411 Outb(scc->ctrl,RES_EXT_INT);
1412
1413 netif_wake_queue(scc->dev);
1414 spin_unlock_irqrestore(&scc->lock, flags);
1415 }
1416
1417
1418 static void
1419 scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1420 {
1421 unsigned long flags;
1422
1423 spin_lock_irqsave(&scc->lock, flags);
1424 netif_stop_queue(scc->dev);
1425 scc_discard_buffers(scc);
1426
1427 del_timer(&scc->tx_wdog);
1428
1429 scc->tx_wdog.data = (unsigned long) scc;
1430 scc->tx_wdog.function = scc_stop_calibrate;
1431 scc->tx_wdog.expires = jiffies + HZ*duration;
1432 add_timer(&scc->tx_wdog);
1433
1434 /* This doesn't seem to work. Why not? */
1435 wr(scc, R6, 0);
1436 wr(scc, R7, pattern);
1437
1438 /*
1439 * Don't know if this works.
1440 * Damn, where is my Z8530 programming manual...?
1441 */
1442
1443 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1444 Outb(scc->ctrl,RES_EXT_INT);
1445
1446 scc_key_trx(scc, TX_ON);
1447 spin_unlock_irqrestore(&scc->lock, flags);
1448 }
1449
1450 /* ******************************************************************* */
1451 /* * Init channel structures, special HW, etc... * */
1452 /* ******************************************************************* */
1453
1454 /*
1455 * Reset the Z8530s and setup special hardware
1456 */
1457
1458 static void z8530_init(void)
1459 {
1460 struct scc_channel *scc;
1461 int chip, k;
1462 unsigned long flags;
1463 char *flag;
1464
1465
1466 printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1467
1468 flag=" ";
1469 for (k = 0; k < nr_irqs; k++)
1470 if (Ivec[k].used)
1471 {
1472 printk("%s%d", flag, k);
1473 flag=",";
1474 }
1475 printk("\n");
1476
1477
1478 /* reset and pre-init all chips in the system */
1479 for (chip = 0; chip < Nchips; chip++)
1480 {
1481 scc=&SCC_Info[2*chip];
1482 if (!scc->ctrl) continue;
1483
1484 /* Special SCC cards */
1485
1486 if(scc->brand & EAGLE) /* this is an EAGLE card */
1487 Outb(scc->special,0x08); /* enable interrupt on the board */
1488
1489 if(scc->brand & (PC100 | PRIMUS)) /* this is a PC100/PRIMUS card */
1490 Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */
1491
1492
1493 /* Reset and pre-init Z8530 */
1494
1495 spin_lock_irqsave(&scc->lock, flags);
1496
1497 Outb(scc->ctrl, 0);
1498 OutReg(scc->ctrl,R9,FHWRES); /* force hardware reset */
1499 udelay(100); /* give it 'a bit' more time than required */
1500 wr(scc, R2, chip*16); /* interrupt vector */
1501 wr(scc, R9, VIS); /* vector includes status */
1502 spin_unlock_irqrestore(&scc->lock, flags);
1503 }
1504
1505
1506 Driver_Initialized = 1;
1507 }
1508
1509 /*
1510 * Allocate device structure, err, instance, and register driver
1511 */
1512
1513 static int scc_net_alloc(const char *name, struct scc_channel *scc)
1514 {
1515 int err;
1516 struct net_device *dev;
1517
1518 dev = alloc_netdev(0, name, scc_net_setup);
1519 if (!dev)
1520 return -ENOMEM;
1521
1522 dev->ml_priv = scc;
1523 scc->dev = dev;
1524 spin_lock_init(&scc->lock);
1525 init_timer(&scc->tx_t);
1526 init_timer(&scc->tx_wdog);
1527
1528 err = register_netdevice(dev);
1529 if (err) {
1530 printk(KERN_ERR "%s: can't register network device (%d)\n",
1531 name, err);
1532 free_netdev(dev);
1533 scc->dev = NULL;
1534 return err;
1535 }
1536
1537 return 0;
1538 }
1539
1540
1541
1542 /* ******************************************************************** */
1543 /* * Network driver methods * */
1544 /* ******************************************************************** */
1545
1546 static const struct net_device_ops scc_netdev_ops = {
1547 .ndo_open = scc_net_open,
1548 .ndo_stop = scc_net_close,
1549 .ndo_start_xmit = scc_net_tx,
1550 .ndo_set_mac_address = scc_net_set_mac_address,
1551 .ndo_get_stats = scc_net_get_stats,
1552 .ndo_do_ioctl = scc_net_ioctl,
1553 };
1554
1555 /* ----> Initialize device <----- */
1556
1557 static void scc_net_setup(struct net_device *dev)
1558 {
1559 dev->tx_queue_len = 16; /* should be enough... */
1560
1561 dev->netdev_ops = &scc_netdev_ops;
1562 dev->header_ops = &ax25_header_ops;
1563
1564 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1565 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
1566
1567 dev->flags = 0;
1568
1569 dev->type = ARPHRD_AX25;
1570 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1571 dev->mtu = AX25_DEF_PACLEN;
1572 dev->addr_len = AX25_ADDR_LEN;
1573
1574 }
1575
1576 /* ----> open network device <---- */
1577
1578 static int scc_net_open(struct net_device *dev)
1579 {
1580 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1581
1582 if (!scc->init)
1583 return -EINVAL;
1584
1585 scc->tx_buff = NULL;
1586 skb_queue_head_init(&scc->tx_queue);
1587
1588 init_channel(scc);
1589
1590 netif_start_queue(dev);
1591 return 0;
1592 }
1593
1594 /* ----> close network device <---- */
1595
1596 static int scc_net_close(struct net_device *dev)
1597 {
1598 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1599 unsigned long flags;
1600
1601 netif_stop_queue(dev);
1602
1603 spin_lock_irqsave(&scc->lock, flags);
1604 Outb(scc->ctrl,0); /* Make sure pointer is written */
1605 wr(scc,R1,0); /* disable interrupts */
1606 wr(scc,R3,0);
1607 spin_unlock_irqrestore(&scc->lock, flags);
1608
1609 del_timer_sync(&scc->tx_t);
1610 del_timer_sync(&scc->tx_wdog);
1611
1612 scc_discard_buffers(scc);
1613
1614 return 0;
1615 }
1616
1617 /* ----> receive frame, called from scc_rxint() <---- */
1618
1619 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1620 {
1621 if (skb->len == 0) {
1622 dev_kfree_skb_irq(skb);
1623 return;
1624 }
1625
1626 scc->dev_stat.rx_packets++;
1627 scc->dev_stat.rx_bytes += skb->len;
1628
1629 skb->protocol = ax25_type_trans(skb, scc->dev);
1630
1631 netif_rx(skb);
1632 }
1633
1634 /* ----> transmit frame <---- */
1635
1636 static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1637 {
1638 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1639 unsigned long flags;
1640 char kisscmd;
1641
1642 if (skb->len > scc->stat.bufsize || skb->len < 2) {
1643 scc->dev_stat.tx_dropped++; /* bogus frame */
1644 dev_kfree_skb(skb);
1645 return NETDEV_TX_OK;
1646 }
1647
1648 scc->dev_stat.tx_packets++;
1649 scc->dev_stat.tx_bytes += skb->len;
1650 scc->stat.txframes++;
1651
1652 kisscmd = *skb->data & 0x1f;
1653 skb_pull(skb, 1);
1654
1655 if (kisscmd) {
1656 scc_set_param(scc, kisscmd, *skb->data);
1657 dev_kfree_skb(skb);
1658 return NETDEV_TX_OK;
1659 }
1660
1661 spin_lock_irqsave(&scc->lock, flags);
1662
1663 if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1664 struct sk_buff *skb_del;
1665 skb_del = skb_dequeue(&scc->tx_queue);
1666 dev_kfree_skb(skb_del);
1667 }
1668 skb_queue_tail(&scc->tx_queue, skb);
1669 dev->trans_start = jiffies;
1670
1671
1672 /*
1673 * Start transmission if the trx state is idle or
1674 * t_idle hasn't expired yet. Use dwait/persistence/slottime
1675 * algorithm for normal halfduplex operation.
1676 */
1677
1678 if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1679 scc->stat.tx_state = TXS_BUSY;
1680 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1681 __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1682 else
1683 __scc_start_tx_timer(scc, t_dwait, 0);
1684 }
1685 spin_unlock_irqrestore(&scc->lock, flags);
1686 return NETDEV_TX_OK;
1687 }
1688
1689 /* ----> ioctl functions <---- */
1690
1691 /*
1692 * SIOCSCCCFG - configure driver arg: (struct scc_hw_config *) arg
1693 * SIOCSCCINI - initialize driver arg: ---
1694 * SIOCSCCCHANINI - initialize channel arg: (struct scc_modem *) arg
1695 * SIOCSCCSMEM - set memory arg: (struct scc_mem_config *) arg
1696 * SIOCSCCGKISS - get level 1 parameter arg: (struct scc_kiss_cmd *) arg
1697 * SIOCSCCSKISS - set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1698 * SIOCSCCGSTAT - get driver status arg: (struct scc_stat *) arg
1699 * SIOCSCCCAL - send calib. pattern arg: (struct scc_calibrate *) arg
1700 */
1701
1702 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1703 {
1704 struct scc_kiss_cmd kiss_cmd;
1705 struct scc_mem_config memcfg;
1706 struct scc_hw_config hwcfg;
1707 struct scc_calibrate cal;
1708 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1709 int chan;
1710 unsigned char device_name[IFNAMSIZ];
1711 void __user *arg = ifr->ifr_data;
1712
1713
1714 if (!Driver_Initialized)
1715 {
1716 if (cmd == SIOCSCCCFG)
1717 {
1718 int found = 1;
1719
1720 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1721 if (!arg) return -EFAULT;
1722
1723 if (Nchips >= SCC_MAXCHIPS)
1724 return -EINVAL;
1725
1726 if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1727 return -EFAULT;
1728
1729 if (hwcfg.irq == 2) hwcfg.irq = 9;
1730
1731 if (hwcfg.irq < 0 || hwcfg.irq >= nr_irqs)
1732 return -EINVAL;
1733
1734 if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1735 {
1736 if (request_irq(hwcfg.irq, scc_isr,
1737 IRQF_DISABLED, "AX.25 SCC",
1738 (void *)(long) hwcfg.irq))
1739 printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1740 else
1741 Ivec[hwcfg.irq].used = 1;
1742 }
1743
1744 if (hwcfg.vector_latch && !Vector_Latch) {
1745 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1746 printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1747 else
1748 Vector_Latch = hwcfg.vector_latch;
1749 }
1750
1751 if (hwcfg.clock == 0)
1752 hwcfg.clock = SCC_DEFAULT_CLOCK;
1753
1754 #ifndef SCC_DONT_CHECK
1755
1756 if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1757 {
1758 disable_irq(hwcfg.irq);
1759 Outb(hwcfg.ctrl_a, 0);
1760 OutReg(hwcfg.ctrl_a, R9, FHWRES);
1761 udelay(100);
1762 OutReg(hwcfg.ctrl_a,R13,0x55); /* is this chip really there? */
1763 udelay(5);
1764
1765 if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1766 found = 0;
1767 enable_irq(hwcfg.irq);
1768 release_region(hwcfg.ctrl_a, 1);
1769 }
1770 else
1771 found = 0;
1772 #endif
1773
1774 if (found)
1775 {
1776 SCC_Info[2*Nchips ].ctrl = hwcfg.ctrl_a;
1777 SCC_Info[2*Nchips ].data = hwcfg.data_a;
1778 SCC_Info[2*Nchips ].irq = hwcfg.irq;
1779 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1780 SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1781 SCC_Info[2*Nchips+1].irq = hwcfg.irq;
1782
1783 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1784 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1785 SCC_ctrl[Nchips].irq = hwcfg.irq;
1786 }
1787
1788
1789 for (chan = 0; chan < 2; chan++)
1790 {
1791 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1792
1793 SCC_Info[2*Nchips+chan].special = hwcfg.special;
1794 SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1795 SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1796 SCC_Info[2*Nchips+chan].option = hwcfg.option;
1797 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1798
1799 #ifdef SCC_DONT_CHECK
1800 printk(KERN_INFO "%s: data port = 0x%3.3x control port = 0x%3.3x\n",
1801 device_name,
1802 SCC_Info[2*Nchips+chan].data,
1803 SCC_Info[2*Nchips+chan].ctrl);
1804
1805 #else
1806 printk(KERN_INFO "%s: data port = 0x%3.3lx control port = 0x%3.3lx -- %s\n",
1807 device_name,
1808 chan? hwcfg.data_b : hwcfg.data_a,
1809 chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1810 found? "found" : "missing");
1811 #endif
1812
1813 if (found)
1814 {
1815 request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1816 request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1817 if (Nchips+chan != 0 &&
1818 scc_net_alloc(device_name,
1819 &SCC_Info[2*Nchips+chan]))
1820 return -EINVAL;
1821 }
1822 }
1823
1824 if (found) Nchips++;
1825
1826 return 0;
1827 }
1828
1829 if (cmd == SIOCSCCINI)
1830 {
1831 if (!capable(CAP_SYS_RAWIO))
1832 return -EPERM;
1833
1834 if (Nchips == 0)
1835 return -EINVAL;
1836
1837 z8530_init();
1838 return 0;
1839 }
1840
1841 return -EINVAL; /* confuse the user */
1842 }
1843
1844 if (!scc->init)
1845 {
1846 if (cmd == SIOCSCCCHANINI)
1847 {
1848 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1849 if (!arg) return -EINVAL;
1850
1851 scc->stat.bufsize = SCC_BUFSIZE;
1852
1853 if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1854 return -EINVAL;
1855
1856 /* default KISS Params */
1857
1858 if (scc->modem.speed < 4800)
1859 {
1860 scc->kiss.txdelay = 36; /* 360 ms */
1861 scc->kiss.persist = 42; /* 25% persistence */ /* was 25 */
1862 scc->kiss.slottime = 16; /* 160 ms */
1863 scc->kiss.tailtime = 4; /* minimal reasonable value */
1864 scc->kiss.fulldup = 0; /* CSMA */
1865 scc->kiss.waittime = 50; /* 500 ms */
1866 scc->kiss.maxkeyup = 10; /* 10 s */
1867 scc->kiss.mintime = 3; /* 3 s */
1868 scc->kiss.idletime = 30; /* 30 s */
1869 scc->kiss.maxdefer = 120; /* 2 min */
1870 scc->kiss.softdcd = 0; /* hardware dcd */
1871 } else {
1872 scc->kiss.txdelay = 10; /* 100 ms */
1873 scc->kiss.persist = 64; /* 25% persistence */ /* was 25 */
1874 scc->kiss.slottime = 8; /* 160 ms */
1875 scc->kiss.tailtime = 1; /* minimal reasonable value */
1876 scc->kiss.fulldup = 0; /* CSMA */
1877 scc->kiss.waittime = 50; /* 500 ms */
1878 scc->kiss.maxkeyup = 7; /* 7 s */
1879 scc->kiss.mintime = 3; /* 3 s */
1880 scc->kiss.idletime = 30; /* 30 s */
1881 scc->kiss.maxdefer = 120; /* 2 min */
1882 scc->kiss.softdcd = 0; /* hardware dcd */
1883 }
1884
1885 scc->tx_buff = NULL;
1886 skb_queue_head_init(&scc->tx_queue);
1887 scc->init = 1;
1888
1889 return 0;
1890 }
1891
1892 return -EINVAL;
1893 }
1894
1895 switch(cmd)
1896 {
1897 case SIOCSCCRESERVED:
1898 return -ENOIOCTLCMD;
1899
1900 case SIOCSCCSMEM:
1901 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1902 if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1903 return -EINVAL;
1904 scc->stat.bufsize = memcfg.bufsize;
1905 return 0;
1906
1907 case SIOCSCCGSTAT:
1908 if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1909 return -EINVAL;
1910 return 0;
1911
1912 case SIOCSCCGKISS:
1913 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1914 return -EINVAL;
1915 kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1916 if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1917 return -EINVAL;
1918 return 0;
1919
1920 case SIOCSCCSKISS:
1921 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1922 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1923 return -EINVAL;
1924 return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1925
1926 case SIOCSCCCAL:
1927 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1928 if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1929 return -EINVAL;
1930
1931 scc_start_calibrate(scc, cal.time, cal.pattern);
1932 return 0;
1933
1934 default:
1935 return -ENOIOCTLCMD;
1936
1937 }
1938
1939 return -EINVAL;
1940 }
1941
1942 /* ----> set interface callsign <---- */
1943
1944 static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1945 {
1946 struct sockaddr *sa = (struct sockaddr *) addr;
1947 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1948 return 0;
1949 }
1950
1951 /* ----> get statistics <---- */
1952
1953 static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1954 {
1955 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1956
1957 scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1958 scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1959 scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1960 scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1961
1962 return &scc->dev_stat;
1963 }
1964
1965 /* ******************************************************************** */
1966 /* * dump statistics to /proc/net/z8530drv * */
1967 /* ******************************************************************** */
1968
1969 #ifdef CONFIG_PROC_FS
1970
1971 static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1972 {
1973 int k;
1974
1975 for (k = 0; k < Nchips*2; ++k) {
1976 if (!SCC_Info[k].init)
1977 continue;
1978 if (pos-- == 0)
1979 return &SCC_Info[k];
1980 }
1981 return NULL;
1982 }
1983
1984 static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1985 {
1986 return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1987
1988 }
1989
1990 static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1991 {
1992 unsigned k;
1993 struct scc_channel *scc = v;
1994 ++*pos;
1995
1996 for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
1997 k < Nchips*2; ++k) {
1998 if (SCC_Info[k].init)
1999 return &SCC_Info[k];
2000 }
2001 return NULL;
2002 }
2003
2004 static void scc_net_seq_stop(struct seq_file *seq, void *v)
2005 {
2006 }
2007
2008 static int scc_net_seq_show(struct seq_file *seq, void *v)
2009 {
2010 if (v == SEQ_START_TOKEN) {
2011 seq_puts(seq, "z8530drv-"VERSION"\n");
2012 } else if (!Driver_Initialized) {
2013 seq_puts(seq, "not initialized\n");
2014 } else if (!Nchips) {
2015 seq_puts(seq, "chips missing\n");
2016 } else {
2017 const struct scc_channel *scc = v;
2018 const struct scc_stat *stat = &scc->stat;
2019 const struct scc_kiss *kiss = &scc->kiss;
2020
2021
2022 /* dev data ctrl irq clock brand enh vector special option
2023 * baud nrz clocksrc softdcd bufsize
2024 * rxints txints exints spints
2025 * rcvd rxerrs over / xmit txerrs under / nospace bufsize
2026 * txd pers slot tail ful wait min maxk idl defr txof grp
2027 * W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2028 * R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2029 */
2030
2031 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2032 scc->dev->name,
2033 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2034 scc->enhanced, Vector_Latch, scc->special,
2035 scc->option);
2036 seq_printf(seq, "\t%lu %d %d %d %d\n",
2037 scc->modem.speed, scc->modem.nrz,
2038 scc->modem.clocksrc, kiss->softdcd,
2039 stat->bufsize);
2040 seq_printf(seq, "\t%lu %lu %lu %lu\n",
2041 stat->rxints, stat->txints, stat->exints, stat->spints);
2042 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2043 stat->rxframes, stat->rxerrs, stat->rx_over,
2044 stat->txframes, stat->txerrs, stat->tx_under,
2045 stat->nospace, stat->tx_state);
2046
2047 #define K(x) kiss->x
2048 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2049 K(txdelay), K(persist), K(slottime), K(tailtime),
2050 K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2051 K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2052 #undef K
2053 #ifdef SCC_DEBUG
2054 {
2055 int reg;
2056
2057 seq_printf(seq, "\tW ");
2058 for (reg = 0; reg < 16; reg++)
2059 seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2060 seq_printf(seq, "\n");
2061
2062 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2063 for (reg = 3; reg < 8; reg++)
2064 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2065 seq_printf(seq, "XX ");
2066 for (reg = 9; reg < 16; reg++)
2067 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2068 seq_printf(seq, "\n");
2069 }
2070 #endif
2071 seq_putc(seq, '\n');
2072 }
2073
2074 return 0;
2075 }
2076
2077 static const struct seq_operations scc_net_seq_ops = {
2078 .start = scc_net_seq_start,
2079 .next = scc_net_seq_next,
2080 .stop = scc_net_seq_stop,
2081 .show = scc_net_seq_show,
2082 };
2083
2084
2085 static int scc_net_seq_open(struct inode *inode, struct file *file)
2086 {
2087 return seq_open(file, &scc_net_seq_ops);
2088 }
2089
2090 static const struct file_operations scc_net_seq_fops = {
2091 .owner = THIS_MODULE,
2092 .open = scc_net_seq_open,
2093 .read = seq_read,
2094 .llseek = seq_lseek,
2095 .release = seq_release_private,
2096 };
2097
2098 #endif /* CONFIG_PROC_FS */
2099
2100
2101 /* ******************************************************************** */
2102 /* * Init SCC driver * */
2103 /* ******************************************************************** */
2104
2105 static int __init scc_init_driver (void)
2106 {
2107 char devname[IFNAMSIZ];
2108
2109 printk(banner);
2110
2111 sprintf(devname,"%s0", SCC_DriverName);
2112
2113 rtnl_lock();
2114 if (scc_net_alloc(devname, SCC_Info)) {
2115 rtnl_unlock();
2116 printk(KERN_ERR "z8530drv: cannot initialize module\n");
2117 return -EIO;
2118 }
2119 rtnl_unlock();
2120
2121 proc_create("z8530drv", 0, init_net.proc_net, &scc_net_seq_fops);
2122
2123 return 0;
2124 }
2125
2126 static void __exit scc_cleanup_driver(void)
2127 {
2128 io_port ctrl;
2129 int k;
2130 struct scc_channel *scc;
2131 struct net_device *dev;
2132
2133 if (Nchips == 0 && (dev = SCC_Info[0].dev))
2134 {
2135 unregister_netdev(dev);
2136 free_netdev(dev);
2137 }
2138
2139 /* Guard against chip prattle */
2140 local_irq_disable();
2141
2142 for (k = 0; k < Nchips; k++)
2143 if ( (ctrl = SCC_ctrl[k].chan_A) )
2144 {
2145 Outb(ctrl, 0);
2146 OutReg(ctrl,R9,FHWRES); /* force hardware reset */
2147 udelay(50);
2148 }
2149
2150 /* To unload the port must be closed so no real IRQ pending */
2151 for (k = 0; k < nr_irqs ; k++)
2152 if (Ivec[k].used) free_irq(k, NULL);
2153
2154 local_irq_enable();
2155
2156 /* Now clean up */
2157 for (k = 0; k < Nchips*2; k++)
2158 {
2159 scc = &SCC_Info[k];
2160 if (scc->ctrl)
2161 {
2162 release_region(scc->ctrl, 1);
2163 release_region(scc->data, 1);
2164 }
2165 if (scc->dev)
2166 {
2167 unregister_netdev(scc->dev);
2168 free_netdev(scc->dev);
2169 }
2170 }
2171
2172
2173 if (Vector_Latch)
2174 release_region(Vector_Latch, 1);
2175
2176 remove_proc_entry("z8530drv", init_net.proc_net);
2177 }
2178
2179 MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2180 MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2181 MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2182 MODULE_LICENSE("GPL");
2183 module_init(scc_init_driver);
2184 module_exit(scc_cleanup_driver);
Linux with added FPC-III support