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[mirror_ubuntu-artful-kernel.git] / drivers / net / hamradio / scc.c
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/config.h>
152 #include <linux/module.h>
153 #include <linux/errno.h>
154 #include <linux/signal.h>
155 #include <linux/timer.h>
156 #include <linux/interrupt.h>
157 #include <linux/ioport.h>
158 #include <linux/string.h>
159 #include <linux/in.h>
160 #include <linux/fcntl.h>
161 #include <linux/ptrace.h>
162 #include <linux/slab.h>
163 #include <linux/delay.h>
164 #include <linux/skbuff.h>
165 #include <linux/netdevice.h>
166 #include <linux/rtnetlink.h>
167 #include <linux/if_ether.h>
168 #include <linux/if_arp.h>
169 #include <linux/socket.h>
170 #include <linux/init.h>
171 #include <linux/scc.h>
172 #include <linux/ctype.h>
173 #include <linux/kernel.h>
174 #include <linux/proc_fs.h>
175 #include <linux/seq_file.h>
176 #include <linux/bitops.h>
177
178 #include <net/ax25.h>
179
180 #include <asm/irq.h>
181 #include <asm/system.h>
182 #include <asm/io.h>
183 #include <asm/uaccess.h>
184
185 #include "z8530.h"
186
187 static char banner[] __initdata = KERN_INFO "AX.25: Z8530 SCC driver version "VERSION".dl1bke\n";
188
189 static void t_dwait(unsigned long);
190 static void t_txdelay(unsigned long);
191 static void t_tail(unsigned long);
192 static void t_busy(unsigned long);
193 static void t_maxkeyup(unsigned long);
194 static void t_idle(unsigned long);
195 static void scc_tx_done(struct scc_channel *);
196 static void scc_start_tx_timer(struct scc_channel *, void (*)(unsigned long), unsigned long);
197 static void scc_start_maxkeyup(struct scc_channel *);
198 static void scc_start_defer(struct scc_channel *);
199
200 static void z8530_init(void);
201
202 static void init_channel(struct scc_channel *scc);
203 static void scc_key_trx (struct scc_channel *scc, char tx);
204 static irqreturn_t scc_isr(int irq, void *dev_id, struct pt_regs *regs);
205 static void scc_init_timer(struct scc_channel *scc);
206
207 static int scc_net_alloc(const char *name, struct scc_channel *scc);
208 static void scc_net_setup(struct net_device *dev);
209 static int scc_net_open(struct net_device *dev);
210 static int scc_net_close(struct net_device *dev);
211 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb);
212 static int scc_net_tx(struct sk_buff *skb, struct net_device *dev);
213 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
214 static int scc_net_set_mac_address(struct net_device *dev, void *addr);
215 static struct net_device_stats * scc_net_get_stats(struct net_device *dev);
216
217 static unsigned char SCC_DriverName[] = "scc";
218
219 static struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS];
220
221 static struct scc_channel SCC_Info[2 * SCC_MAXCHIPS]; /* information per channel */
222
223 static struct scc_ctrl {
224 io_port chan_A;
225 io_port chan_B;
226 int irq;
227 } SCC_ctrl[SCC_MAXCHIPS+1];
228
229 static unsigned char Driver_Initialized;
230 static int Nchips;
231 static io_port Vector_Latch;
232
233
234 /* ******************************************************************** */
235 /* * Port Access Functions * */
236 /* ******************************************************************** */
237
238 /* These provide interrupt save 2-step access to the Z8530 registers */
239
240 static DEFINE_SPINLOCK(iolock); /* Guards paired accesses */
241
242 static inline unsigned char InReg(io_port port, unsigned char reg)
243 {
244 unsigned long flags;
245 unsigned char r;
246
247 spin_lock_irqsave(&iolock, flags);
248 #ifdef SCC_LDELAY
249 Outb(port, reg);
250 udelay(SCC_LDELAY);
251 r=Inb(port);
252 udelay(SCC_LDELAY);
253 #else
254 Outb(port, reg);
255 r=Inb(port);
256 #endif
257 spin_unlock_irqrestore(&iolock, flags);
258 return r;
259 }
260
261 static inline void OutReg(io_port port, unsigned char reg, unsigned char val)
262 {
263 unsigned long flags;
264
265 spin_lock_irqsave(&iolock, flags);
266 #ifdef SCC_LDELAY
267 Outb(port, reg); udelay(SCC_LDELAY);
268 Outb(port, val); udelay(SCC_LDELAY);
269 #else
270 Outb(port, reg);
271 Outb(port, val);
272 #endif
273 spin_unlock_irqrestore(&iolock, flags);
274 }
275
276 static inline void wr(struct scc_channel *scc, unsigned char reg,
277 unsigned char val)
278 {
279 OutReg(scc->ctrl, reg, (scc->wreg[reg] = val));
280 }
281
282 static inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val)
283 {
284 OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val));
285 }
286
287 static inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val)
288 {
289 OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val));
290 }
291
292 /* ******************************************************************** */
293 /* * Some useful macros * */
294 /* ******************************************************************** */
295
296 static inline void scc_discard_buffers(struct scc_channel *scc)
297 {
298 unsigned long flags;
299
300 spin_lock_irqsave(&scc->lock, flags);
301 if (scc->tx_buff != NULL)
302 {
303 dev_kfree_skb(scc->tx_buff);
304 scc->tx_buff = NULL;
305 }
306
307 while (skb_queue_len(&scc->tx_queue))
308 dev_kfree_skb(skb_dequeue(&scc->tx_queue));
309
310 spin_unlock_irqrestore(&scc->lock, flags);
311 }
312
313
314
315 /* ******************************************************************** */
316 /* * Interrupt Service Routines * */
317 /* ******************************************************************** */
318
319
320 /* ----> subroutines for the interrupt handlers <---- */
321
322 static inline void scc_notify(struct scc_channel *scc, int event)
323 {
324 struct sk_buff *skb;
325 char *bp;
326
327 if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA)
328 return;
329
330 skb = dev_alloc_skb(2);
331 if (skb != NULL)
332 {
333 bp = skb_put(skb, 2);
334 *bp++ = PARAM_HWEVENT;
335 *bp++ = event;
336 scc_net_rx(scc, skb);
337 } else
338 scc->stat.nospace++;
339 }
340
341 static inline void flush_rx_FIFO(struct scc_channel *scc)
342 {
343 int k;
344
345 for (k=0; k<3; k++)
346 Inb(scc->data);
347
348 if(scc->rx_buff != NULL) /* did we receive something? */
349 {
350 scc->stat.rxerrs++; /* then count it as an error */
351 dev_kfree_skb_irq(scc->rx_buff);
352 scc->rx_buff = NULL;
353 }
354 }
355
356 static void start_hunt(struct scc_channel *scc)
357 {
358 if ((scc->modem.clocksrc != CLK_EXTERNAL))
359 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
360 or(scc,R3,ENT_HM|RxENABLE); /* enable the receiver, hunt mode */
361 }
362
363 /* ----> four different interrupt handlers for Tx, Rx, changing of */
364 /* DCD/CTS and Rx/Tx errors */
365
366 /* Transmitter interrupt handler */
367 static inline void scc_txint(struct scc_channel *scc)
368 {
369 struct sk_buff *skb;
370
371 scc->stat.txints++;
372 skb = scc->tx_buff;
373
374 /* send first octet */
375
376 if (skb == NULL)
377 {
378 skb = skb_dequeue(&scc->tx_queue);
379 scc->tx_buff = skb;
380 netif_wake_queue(scc->dev);
381
382 if (skb == NULL)
383 {
384 scc_tx_done(scc);
385 Outb(scc->ctrl, RES_Tx_P);
386 return;
387 }
388
389 if (skb->len == 0) /* Paranoia... */
390 {
391 dev_kfree_skb_irq(skb);
392 scc->tx_buff = NULL;
393 scc_tx_done(scc);
394 Outb(scc->ctrl, RES_Tx_P);
395 return;
396 }
397
398 scc->stat.tx_state = TXS_ACTIVE;
399
400 OutReg(scc->ctrl, R0, RES_Tx_CRC);
401 /* reset CRC generator */
402 or(scc,R10,ABUNDER); /* re-install underrun protection */
403 Outb(scc->data,*skb->data); /* send byte */
404 skb_pull(skb, 1);
405
406 if (!scc->enhanced) /* reset EOM latch */
407 Outb(scc->ctrl,RES_EOM_L);
408 return;
409 }
410
411 /* End Of Frame... */
412
413 if (skb->len == 0)
414 {
415 Outb(scc->ctrl, RES_Tx_P); /* reset pending int */
416 cl(scc, R10, ABUNDER); /* send CRC */
417 dev_kfree_skb_irq(skb);
418 scc->tx_buff = NULL;
419 scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */
420 return;
421 }
422
423 /* send octet */
424
425 Outb(scc->data,*skb->data);
426 skb_pull(skb, 1);
427 }
428
429
430 /* External/Status interrupt handler */
431 static inline void scc_exint(struct scc_channel *scc)
432 {
433 unsigned char status,changes,chg_and_stat;
434
435 scc->stat.exints++;
436
437 status = InReg(scc->ctrl,R0);
438 changes = status ^ scc->status;
439 chg_and_stat = changes & status;
440
441 /* ABORT: generated whenever DCD drops while receiving */
442
443 if (chg_and_stat & BRK_ABRT) /* Received an ABORT */
444 flush_rx_FIFO(scc);
445
446 /* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */
447
448 if ((changes & SYNC_HUNT) && scc->kiss.softdcd)
449 {
450 if (status & SYNC_HUNT)
451 {
452 scc->dcd = 0;
453 flush_rx_FIFO(scc);
454 if ((scc->modem.clocksrc != CLK_EXTERNAL))
455 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
456 } else {
457 scc->dcd = 1;
458 }
459
460 scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON);
461 }
462
463 /* DCD: on = start to receive packet, off = ABORT condition */
464 /* (a successfully received packet generates a special condition int) */
465
466 if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */
467 {
468 if(status & DCD) /* DCD is now ON */
469 {
470 start_hunt(scc);
471 scc->dcd = 1;
472 } else { /* DCD is now OFF */
473 cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */
474 flush_rx_FIFO(scc);
475 scc->dcd = 0;
476 }
477
478 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
479 }
480
481 #ifdef notdef
482 /* CTS: use external TxDelay (what's that good for?!)
483 * Anyway: If we _could_ use it (BayCom USCC uses CTS for
484 * own purposes) we _should_ use the "autoenable" feature
485 * of the Z8530 and not this interrupt...
486 */
487
488 if (chg_and_stat & CTS) /* CTS is now ON */
489 {
490 if (scc->kiss.txdelay == 0) /* zero TXDELAY = wait for CTS */
491 scc_start_tx_timer(scc, t_txdelay, 0);
492 }
493 #endif
494
495 if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM))
496 {
497 scc->stat.tx_under++; /* oops, an underrun! count 'em */
498 Outb(scc->ctrl, RES_EXT_INT); /* reset ext/status interrupts */
499
500 if (scc->tx_buff != NULL)
501 {
502 dev_kfree_skb_irq(scc->tx_buff);
503 scc->tx_buff = NULL;
504 }
505
506 or(scc,R10,ABUNDER);
507 scc_start_tx_timer(scc, t_txdelay, 0); /* restart transmission */
508 }
509
510 scc->status = status;
511 Outb(scc->ctrl,RES_EXT_INT);
512 }
513
514
515 /* Receiver interrupt handler */
516 static inline void scc_rxint(struct scc_channel *scc)
517 {
518 struct sk_buff *skb;
519
520 scc->stat.rxints++;
521
522 if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF)
523 {
524 Inb(scc->data); /* discard char */
525 or(scc,R3,ENT_HM); /* enter hunt mode for next flag */
526 return;
527 }
528
529 skb = scc->rx_buff;
530
531 if (skb == NULL)
532 {
533 skb = dev_alloc_skb(scc->stat.bufsize);
534 if (skb == NULL)
535 {
536 scc->dev_stat.rx_dropped++;
537 scc->stat.nospace++;
538 Inb(scc->data);
539 or(scc, R3, ENT_HM);
540 return;
541 }
542
543 scc->rx_buff = skb;
544 *(skb_put(skb, 1)) = 0; /* KISS data */
545 }
546
547 if (skb->len >= scc->stat.bufsize)
548 {
549 #ifdef notdef
550 printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n");
551 #endif
552 dev_kfree_skb_irq(skb);
553 scc->rx_buff = NULL;
554 Inb(scc->data);
555 or(scc, R3, ENT_HM);
556 return;
557 }
558
559 *(skb_put(skb, 1)) = Inb(scc->data);
560 }
561
562
563 /* Receive Special Condition interrupt handler */
564 static inline void scc_spint(struct scc_channel *scc)
565 {
566 unsigned char status;
567 struct sk_buff *skb;
568
569 scc->stat.spints++;
570
571 status = InReg(scc->ctrl,R1); /* read receiver status */
572
573 Inb(scc->data); /* throw away Rx byte */
574 skb = scc->rx_buff;
575
576 if(status & Rx_OVR) /* receiver overrun */
577 {
578 scc->stat.rx_over++; /* count them */
579 or(scc,R3,ENT_HM); /* enter hunt mode for next flag */
580
581 if (skb != NULL)
582 dev_kfree_skb_irq(skb);
583 scc->rx_buff = skb = NULL;
584 }
585
586 if(status & END_FR && skb != NULL) /* end of frame */
587 {
588 /* CRC okay, frame ends on 8 bit boundary and received something ? */
589
590 if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0)
591 {
592 /* ignore last received byte (first of the CRC bytes) */
593 skb_trim(skb, skb->len-1);
594 scc_net_rx(scc, skb);
595 scc->rx_buff = NULL;
596 scc->stat.rxframes++;
597 } else { /* a bad frame */
598 dev_kfree_skb_irq(skb);
599 scc->rx_buff = NULL;
600 scc->stat.rxerrs++;
601 }
602 }
603
604 Outb(scc->ctrl,ERR_RES);
605 }
606
607
608 /* ----> interrupt service routine for the Z8530 <---- */
609
610 static void scc_isr_dispatch(struct scc_channel *scc, int vector)
611 {
612 spin_lock(&scc->lock);
613 switch (vector & VECTOR_MASK)
614 {
615 case TXINT: scc_txint(scc); break;
616 case EXINT: scc_exint(scc); break;
617 case RXINT: scc_rxint(scc); break;
618 case SPINT: scc_spint(scc); break;
619 }
620 spin_unlock(&scc->lock);
621 }
622
623 /* If the card has a latch for the interrupt vector (like the PA0HZP card)
624 use it to get the number of the chip that generated the int.
625 If not: poll all defined chips.
626 */
627
628 #define SCC_IRQTIMEOUT 30000
629
630 static irqreturn_t scc_isr(int irq, void *dev_id, struct pt_regs *regs)
631 {
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 != 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, scc->kiss.idletime*100);
1072 break;
1073 case KISS_DUPLEX_OPTIMA:
1074 scc_notify(scc, HWEV_ALL_SENT);
1075 break;
1076 default:
1077 scc->stat.tx_state = TXS_BUSY;
1078 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1079 }
1080
1081 netif_wake_queue(scc->dev);
1082 }
1083
1084
1085 static unsigned char Rand = 17;
1086
1087 static inline int is_grouped(struct scc_channel *scc)
1088 {
1089 int k;
1090 struct scc_channel *scc2;
1091 unsigned char grp1, grp2;
1092
1093 grp1 = scc->kiss.group;
1094
1095 for (k = 0; k < (Nchips * 2); k++)
1096 {
1097 scc2 = &SCC_Info[k];
1098 grp2 = scc2->kiss.group;
1099
1100 if (scc2 == scc || !(scc2->dev && grp2))
1101 continue;
1102
1103 if ((grp1 & 0x3f) == (grp2 & 0x3f))
1104 {
1105 if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) )
1106 return 1;
1107
1108 if ( (grp1 & RXGROUP) && scc2->dcd )
1109 return 1;
1110 }
1111 }
1112 return 0;
1113 }
1114
1115 /* DWAIT and SLOTTIME expired
1116 *
1117 * fulldup == 0: DCD is active or Rand > P-persistence: start t_busy timer
1118 * else key trx and start txdelay
1119 * fulldup == 1: key trx and start txdelay
1120 * fulldup == 2: mintime expired, reset status or key trx and start txdelay
1121 */
1122
1123 static void t_dwait(unsigned long channel)
1124 {
1125 struct scc_channel *scc = (struct scc_channel *) channel;
1126
1127 if (scc->stat.tx_state == TXS_WAIT) /* maxkeyup or idle timeout */
1128 {
1129 if (skb_queue_len(&scc->tx_queue) == 0) /* nothing to send */
1130 {
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 } else {
1348 if (arg == TX_OFF)
1349 {
1350 scc->stat.tx_state = TXS_BUSY;
1351 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1352 }
1353 }
1354 break;
1355
1356 case PARAM_HWEVENT:
1357 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1358 break;
1359
1360 default: return -EINVAL;
1361 }
1362
1363 return 0;
1364 }
1365
1366
1367
1368 static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1369 {
1370 switch (cmd)
1371 {
1372 case PARAM_TXDELAY: return CAST(scc->kiss.txdelay);
1373 case PARAM_PERSIST: return CAST(scc->kiss.persist);
1374 case PARAM_SLOTTIME: return CAST(scc->kiss.slottime);
1375 case PARAM_TXTAIL: return CAST(scc->kiss.tailtime);
1376 case PARAM_FULLDUP: return CAST(scc->kiss.fulldup);
1377 case PARAM_SOFTDCD: return CAST(scc->kiss.softdcd);
1378 case PARAM_DTR: return CAST((scc->wreg[R5] & DTR)? 1:0);
1379 case PARAM_RTS: return CAST((scc->wreg[R5] & RTS)? 1:0);
1380 case PARAM_SPEED: return CAST(scc->modem.speed);
1381 case PARAM_GROUP: return CAST(scc->kiss.group);
1382 case PARAM_IDLE: return CAST(scc->kiss.idletime);
1383 case PARAM_MIN: return CAST(scc->kiss.mintime);
1384 case PARAM_MAXKEY: return CAST(scc->kiss.maxkeyup);
1385 case PARAM_WAIT: return CAST(scc->kiss.waittime);
1386 case PARAM_MAXDEFER: return CAST(scc->kiss.maxdefer);
1387 case PARAM_TX: return CAST(scc->kiss.tx_inhibit);
1388 default: return NO_SUCH_PARAM;
1389 }
1390
1391 }
1392
1393 #undef CAST
1394
1395 /* ******************************************************************* */
1396 /* * Send calibration pattern * */
1397 /* ******************************************************************* */
1398
1399 static void scc_stop_calibrate(unsigned long channel)
1400 {
1401 struct scc_channel *scc = (struct scc_channel *) channel;
1402 unsigned long flags;
1403
1404 spin_lock_irqsave(&scc->lock, flags);
1405 del_timer(&scc->tx_wdog);
1406 scc_key_trx(scc, TX_OFF);
1407 wr(scc, R6, 0);
1408 wr(scc, R7, FLAG);
1409 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1410 Outb(scc->ctrl,RES_EXT_INT);
1411
1412 netif_wake_queue(scc->dev);
1413 spin_unlock_irqrestore(&scc->lock, flags);
1414 }
1415
1416
1417 static void
1418 scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1419 {
1420 unsigned long flags;
1421
1422 spin_lock_irqsave(&scc->lock, flags);
1423 netif_stop_queue(scc->dev);
1424 scc_discard_buffers(scc);
1425
1426 del_timer(&scc->tx_wdog);
1427
1428 scc->tx_wdog.data = (unsigned long) scc;
1429 scc->tx_wdog.function = scc_stop_calibrate;
1430 scc->tx_wdog.expires = jiffies + HZ*duration;
1431 add_timer(&scc->tx_wdog);
1432
1433 /* This doesn't seem to work. Why not? */
1434 wr(scc, R6, 0);
1435 wr(scc, R7, pattern);
1436
1437 /*
1438 * Don't know if this works.
1439 * Damn, where is my Z8530 programming manual...?
1440 */
1441
1442 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1443 Outb(scc->ctrl,RES_EXT_INT);
1444
1445 scc_key_trx(scc, TX_ON);
1446 spin_unlock_irqrestore(&scc->lock, flags);
1447 }
1448
1449 /* ******************************************************************* */
1450 /* * Init channel structures, special HW, etc... * */
1451 /* ******************************************************************* */
1452
1453 /*
1454 * Reset the Z8530s and setup special hardware
1455 */
1456
1457 static void z8530_init(void)
1458 {
1459 struct scc_channel *scc;
1460 int chip, k;
1461 unsigned long flags;
1462 char *flag;
1463
1464
1465 printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1466
1467 flag=" ";
1468 for (k = 0; k < NR_IRQS; k++)
1469 if (Ivec[k].used)
1470 {
1471 printk("%s%d", flag, k);
1472 flag=",";
1473 }
1474 printk("\n");
1475
1476
1477 /* reset and pre-init all chips in the system */
1478 for (chip = 0; chip < Nchips; chip++)
1479 {
1480 scc=&SCC_Info[2*chip];
1481 if (!scc->ctrl) continue;
1482
1483 /* Special SCC cards */
1484
1485 if(scc->brand & EAGLE) /* this is an EAGLE card */
1486 Outb(scc->special,0x08); /* enable interrupt on the board */
1487
1488 if(scc->brand & (PC100 | PRIMUS)) /* this is a PC100/PRIMUS card */
1489 Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */
1490
1491
1492 /* Reset and pre-init Z8530 */
1493
1494 spin_lock_irqsave(&scc->lock, flags);
1495
1496 Outb(scc->ctrl, 0);
1497 OutReg(scc->ctrl,R9,FHWRES); /* force hardware reset */
1498 udelay(100); /* give it 'a bit' more time than required */
1499 wr(scc, R2, chip*16); /* interrupt vector */
1500 wr(scc, R9, VIS); /* vector includes status */
1501 spin_unlock_irqrestore(&scc->lock, flags);
1502 }
1503
1504
1505 Driver_Initialized = 1;
1506 }
1507
1508 /*
1509 * Allocate device structure, err, instance, and register driver
1510 */
1511
1512 static int scc_net_alloc(const char *name, struct scc_channel *scc)
1513 {
1514 int err;
1515 struct net_device *dev;
1516
1517 dev = alloc_netdev(0, name, scc_net_setup);
1518 if (!dev)
1519 return -ENOMEM;
1520
1521 dev->priv = scc;
1522 scc->dev = dev;
1523 spin_lock_init(&scc->lock);
1524 init_timer(&scc->tx_t);
1525 init_timer(&scc->tx_wdog);
1526
1527 err = register_netdevice(dev);
1528 if (err) {
1529 printk(KERN_ERR "%s: can't register network device (%d)\n",
1530 name, err);
1531 free_netdev(dev);
1532 scc->dev = NULL;
1533 return err;
1534 }
1535
1536 return 0;
1537 }
1538
1539
1540
1541 /* ******************************************************************** */
1542 /* * Network driver methods * */
1543 /* ******************************************************************** */
1544
1545 static unsigned char ax25_bcast[AX25_ADDR_LEN] =
1546 {'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1};
1547 static unsigned char ax25_nocall[AX25_ADDR_LEN] =
1548 {'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1};
1549
1550 /* ----> Initialize device <----- */
1551
1552 static void scc_net_setup(struct net_device *dev)
1553 {
1554 SET_MODULE_OWNER(dev);
1555 dev->tx_queue_len = 16; /* should be enough... */
1556
1557 dev->open = scc_net_open;
1558 dev->stop = scc_net_close;
1559
1560 dev->hard_start_xmit = scc_net_tx;
1561 dev->hard_header = ax25_encapsulate;
1562 dev->rebuild_header = ax25_rebuild_header;
1563 dev->set_mac_address = scc_net_set_mac_address;
1564 dev->get_stats = scc_net_get_stats;
1565 dev->do_ioctl = scc_net_ioctl;
1566 dev->tx_timeout = NULL;
1567
1568 memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
1569 memcpy(dev->dev_addr, ax25_nocall, AX25_ADDR_LEN);
1570
1571 dev->flags = 0;
1572
1573 dev->type = ARPHRD_AX25;
1574 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1575 dev->mtu = AX25_DEF_PACLEN;
1576 dev->addr_len = AX25_ADDR_LEN;
1577
1578 }
1579
1580 /* ----> open network device <---- */
1581
1582 static int scc_net_open(struct net_device *dev)
1583 {
1584 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1585
1586 if (!scc->init)
1587 return -EINVAL;
1588
1589 scc->tx_buff = NULL;
1590 skb_queue_head_init(&scc->tx_queue);
1591
1592 init_channel(scc);
1593
1594 netif_start_queue(dev);
1595 return 0;
1596 }
1597
1598 /* ----> close network device <---- */
1599
1600 static int scc_net_close(struct net_device *dev)
1601 {
1602 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1603 unsigned long flags;
1604
1605 netif_stop_queue(dev);
1606
1607 spin_lock_irqsave(&scc->lock, flags);
1608 Outb(scc->ctrl,0); /* Make sure pointer is written */
1609 wr(scc,R1,0); /* disable interrupts */
1610 wr(scc,R3,0);
1611 spin_unlock_irqrestore(&scc->lock, flags);
1612
1613 del_timer_sync(&scc->tx_t);
1614 del_timer_sync(&scc->tx_wdog);
1615
1616 scc_discard_buffers(scc);
1617
1618 return 0;
1619 }
1620
1621 /* ----> receive frame, called from scc_rxint() <---- */
1622
1623 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1624 {
1625 if (skb->len == 0) {
1626 dev_kfree_skb_irq(skb);
1627 return;
1628 }
1629
1630 scc->dev_stat.rx_packets++;
1631 scc->dev_stat.rx_bytes += skb->len;
1632
1633 skb->dev = scc->dev;
1634 skb->protocol = htons(ETH_P_AX25);
1635 skb->mac.raw = skb->data;
1636 skb->pkt_type = PACKET_HOST;
1637
1638 netif_rx(skb);
1639 scc->dev->last_rx = jiffies;
1640 return;
1641 }
1642
1643 /* ----> transmit frame <---- */
1644
1645 static int scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1646 {
1647 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1648 unsigned long flags;
1649 char kisscmd;
1650
1651 if (skb->len > scc->stat.bufsize || skb->len < 2) {
1652 scc->dev_stat.tx_dropped++; /* bogus frame */
1653 dev_kfree_skb(skb);
1654 return 0;
1655 }
1656
1657 scc->dev_stat.tx_packets++;
1658 scc->dev_stat.tx_bytes += skb->len;
1659 scc->stat.txframes++;
1660
1661 kisscmd = *skb->data & 0x1f;
1662 skb_pull(skb, 1);
1663
1664 if (kisscmd) {
1665 scc_set_param(scc, kisscmd, *skb->data);
1666 dev_kfree_skb(skb);
1667 return 0;
1668 }
1669
1670 spin_lock_irqsave(&scc->lock, flags);
1671
1672 if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1673 struct sk_buff *skb_del;
1674 skb_del = skb_dequeue(&scc->tx_queue);
1675 dev_kfree_skb(skb_del);
1676 }
1677 skb_queue_tail(&scc->tx_queue, skb);
1678 dev->trans_start = jiffies;
1679
1680
1681 /*
1682 * Start transmission if the trx state is idle or
1683 * t_idle hasn't expired yet. Use dwait/persistence/slottime
1684 * algorithm for normal halfduplex operation.
1685 */
1686
1687 if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1688 scc->stat.tx_state = TXS_BUSY;
1689 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1690 __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1691 else
1692 __scc_start_tx_timer(scc, t_dwait, 0);
1693 }
1694 spin_unlock_irqrestore(&scc->lock, flags);
1695 return 0;
1696 }
1697
1698 /* ----> ioctl functions <---- */
1699
1700 /*
1701 * SIOCSCCCFG - configure driver arg: (struct scc_hw_config *) arg
1702 * SIOCSCCINI - initialize driver arg: ---
1703 * SIOCSCCCHANINI - initialize channel arg: (struct scc_modem *) arg
1704 * SIOCSCCSMEM - set memory arg: (struct scc_mem_config *) arg
1705 * SIOCSCCGKISS - get level 1 parameter arg: (struct scc_kiss_cmd *) arg
1706 * SIOCSCCSKISS - set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1707 * SIOCSCCGSTAT - get driver status arg: (struct scc_stat *) arg
1708 * SIOCSCCCAL - send calib. pattern arg: (struct scc_calibrate *) arg
1709 */
1710
1711 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1712 {
1713 struct scc_kiss_cmd kiss_cmd;
1714 struct scc_mem_config memcfg;
1715 struct scc_hw_config hwcfg;
1716 struct scc_calibrate cal;
1717 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1718 int chan;
1719 unsigned char device_name[IFNAMSIZ];
1720 void __user *arg = ifr->ifr_data;
1721
1722
1723 if (!Driver_Initialized)
1724 {
1725 if (cmd == SIOCSCCCFG)
1726 {
1727 int found = 1;
1728
1729 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1730 if (!arg) return -EFAULT;
1731
1732 if (Nchips >= SCC_MAXCHIPS)
1733 return -EINVAL;
1734
1735 if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1736 return -EFAULT;
1737
1738 if (hwcfg.irq == 2) hwcfg.irq = 9;
1739
1740 if (hwcfg.irq < 0 || hwcfg.irq >= NR_IRQS)
1741 return -EINVAL;
1742
1743 if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1744 {
1745 if (request_irq(hwcfg.irq, scc_isr, SA_INTERRUPT, "AX.25 SCC", NULL))
1746 printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1747 else
1748 Ivec[hwcfg.irq].used = 1;
1749 }
1750
1751 if (hwcfg.vector_latch && !Vector_Latch) {
1752 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1753 printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1754 else
1755 Vector_Latch = hwcfg.vector_latch;
1756 }
1757
1758 if (hwcfg.clock == 0)
1759 hwcfg.clock = SCC_DEFAULT_CLOCK;
1760
1761 #ifndef SCC_DONT_CHECK
1762
1763 if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1764 {
1765 disable_irq(hwcfg.irq);
1766 Outb(hwcfg.ctrl_a, 0);
1767 OutReg(hwcfg.ctrl_a, R9, FHWRES);
1768 udelay(100);
1769 OutReg(hwcfg.ctrl_a,R13,0x55); /* is this chip really there? */
1770 udelay(5);
1771
1772 if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1773 found = 0;
1774 enable_irq(hwcfg.irq);
1775 release_region(hwcfg.ctrl_a, 1);
1776 }
1777 else
1778 found = 0;
1779 #endif
1780
1781 if (found)
1782 {
1783 SCC_Info[2*Nchips ].ctrl = hwcfg.ctrl_a;
1784 SCC_Info[2*Nchips ].data = hwcfg.data_a;
1785 SCC_Info[2*Nchips ].irq = hwcfg.irq;
1786 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1787 SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1788 SCC_Info[2*Nchips+1].irq = hwcfg.irq;
1789
1790 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1791 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1792 SCC_ctrl[Nchips].irq = hwcfg.irq;
1793 }
1794
1795
1796 for (chan = 0; chan < 2; chan++)
1797 {
1798 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1799
1800 SCC_Info[2*Nchips+chan].special = hwcfg.special;
1801 SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1802 SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1803 SCC_Info[2*Nchips+chan].option = hwcfg.option;
1804 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1805
1806 #ifdef SCC_DONT_CHECK
1807 printk(KERN_INFO "%s: data port = 0x%3.3x control port = 0x%3.3x\n",
1808 device_name,
1809 SCC_Info[2*Nchips+chan].data,
1810 SCC_Info[2*Nchips+chan].ctrl);
1811
1812 #else
1813 printk(KERN_INFO "%s: data port = 0x%3.3lx control port = 0x%3.3lx -- %s\n",
1814 device_name,
1815 chan? hwcfg.data_b : hwcfg.data_a,
1816 chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1817 found? "found" : "missing");
1818 #endif
1819
1820 if (found)
1821 {
1822 request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1823 request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1824 if (Nchips+chan != 0 &&
1825 scc_net_alloc(device_name,
1826 &SCC_Info[2*Nchips+chan]))
1827 return -EINVAL;
1828 }
1829 }
1830
1831 if (found) Nchips++;
1832
1833 return 0;
1834 }
1835
1836 if (cmd == SIOCSCCINI)
1837 {
1838 if (!capable(CAP_SYS_RAWIO))
1839 return -EPERM;
1840
1841 if (Nchips == 0)
1842 return -EINVAL;
1843
1844 z8530_init();
1845 return 0;
1846 }
1847
1848 return -EINVAL; /* confuse the user */
1849 }
1850
1851 if (!scc->init)
1852 {
1853 if (cmd == SIOCSCCCHANINI)
1854 {
1855 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1856 if (!arg) return -EINVAL;
1857
1858 scc->stat.bufsize = SCC_BUFSIZE;
1859
1860 if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1861 return -EINVAL;
1862
1863 /* default KISS Params */
1864
1865 if (scc->modem.speed < 4800)
1866 {
1867 scc->kiss.txdelay = 36; /* 360 ms */
1868 scc->kiss.persist = 42; /* 25% persistence */ /* was 25 */
1869 scc->kiss.slottime = 16; /* 160 ms */
1870 scc->kiss.tailtime = 4; /* minimal reasonable value */
1871 scc->kiss.fulldup = 0; /* CSMA */
1872 scc->kiss.waittime = 50; /* 500 ms */
1873 scc->kiss.maxkeyup = 10; /* 10 s */
1874 scc->kiss.mintime = 3; /* 3 s */
1875 scc->kiss.idletime = 30; /* 30 s */
1876 scc->kiss.maxdefer = 120; /* 2 min */
1877 scc->kiss.softdcd = 0; /* hardware dcd */
1878 } else {
1879 scc->kiss.txdelay = 10; /* 100 ms */
1880 scc->kiss.persist = 64; /* 25% persistence */ /* was 25 */
1881 scc->kiss.slottime = 8; /* 160 ms */
1882 scc->kiss.tailtime = 1; /* minimal reasonable value */
1883 scc->kiss.fulldup = 0; /* CSMA */
1884 scc->kiss.waittime = 50; /* 500 ms */
1885 scc->kiss.maxkeyup = 7; /* 7 s */
1886 scc->kiss.mintime = 3; /* 3 s */
1887 scc->kiss.idletime = 30; /* 30 s */
1888 scc->kiss.maxdefer = 120; /* 2 min */
1889 scc->kiss.softdcd = 0; /* hardware dcd */
1890 }
1891
1892 scc->tx_buff = NULL;
1893 skb_queue_head_init(&scc->tx_queue);
1894 scc->init = 1;
1895
1896 return 0;
1897 }
1898
1899 return -EINVAL;
1900 }
1901
1902 switch(cmd)
1903 {
1904 case SIOCSCCRESERVED:
1905 return -ENOIOCTLCMD;
1906
1907 case SIOCSCCSMEM:
1908 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1909 if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1910 return -EINVAL;
1911 scc->stat.bufsize = memcfg.bufsize;
1912 return 0;
1913
1914 case SIOCSCCGSTAT:
1915 if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1916 return -EINVAL;
1917 return 0;
1918
1919 case SIOCSCCGKISS:
1920 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1921 return -EINVAL;
1922 kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1923 if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1924 return -EINVAL;
1925 return 0;
1926
1927 case SIOCSCCSKISS:
1928 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1929 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1930 return -EINVAL;
1931 return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1932
1933 case SIOCSCCCAL:
1934 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1935 if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1936 return -EINVAL;
1937
1938 scc_start_calibrate(scc, cal.time, cal.pattern);
1939 return 0;
1940
1941 default:
1942 return -ENOIOCTLCMD;
1943
1944 }
1945
1946 return -EINVAL;
1947 }
1948
1949 /* ----> set interface callsign <---- */
1950
1951 static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1952 {
1953 struct sockaddr *sa = (struct sockaddr *) addr;
1954 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1955 return 0;
1956 }
1957
1958 /* ----> get statistics <---- */
1959
1960 static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1961 {
1962 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1963
1964 scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1965 scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1966 scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1967 scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1968
1969 return &scc->dev_stat;
1970 }
1971
1972 /* ******************************************************************** */
1973 /* * dump statistics to /proc/net/z8530drv * */
1974 /* ******************************************************************** */
1975
1976 #ifdef CONFIG_PROC_FS
1977
1978 static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1979 {
1980 int k;
1981
1982 for (k = 0; k < Nchips*2; ++k) {
1983 if (!SCC_Info[k].init)
1984 continue;
1985 if (pos-- == 0)
1986 return &SCC_Info[k];
1987 }
1988 return NULL;
1989 }
1990
1991 static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1992 {
1993 return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1994
1995 }
1996
1997 static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1998 {
1999 unsigned k;
2000 struct scc_channel *scc = v;
2001 ++*pos;
2002
2003 for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
2004 k < Nchips*2; ++k) {
2005 if (SCC_Info[k].init)
2006 return &SCC_Info[k];
2007 }
2008 return NULL;
2009 }
2010
2011 static void scc_net_seq_stop(struct seq_file *seq, void *v)
2012 {
2013 }
2014
2015 static int scc_net_seq_show(struct seq_file *seq, void *v)
2016 {
2017 if (v == SEQ_START_TOKEN) {
2018 seq_puts(seq, "z8530drv-"VERSION"\n");
2019 } else if (!Driver_Initialized) {
2020 seq_puts(seq, "not initialized\n");
2021 } else if (!Nchips) {
2022 seq_puts(seq, "chips missing\n");
2023 } else {
2024 const struct scc_channel *scc = v;
2025 const struct scc_stat *stat = &scc->stat;
2026 const struct scc_kiss *kiss = &scc->kiss;
2027
2028
2029 /* dev data ctrl irq clock brand enh vector special option
2030 * baud nrz clocksrc softdcd bufsize
2031 * rxints txints exints spints
2032 * rcvd rxerrs over / xmit txerrs under / nospace bufsize
2033 * txd pers slot tail ful wait min maxk idl defr txof grp
2034 * W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2035 * R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2036 */
2037
2038 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2039 scc->dev->name,
2040 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2041 scc->enhanced, Vector_Latch, scc->special,
2042 scc->option);
2043 seq_printf(seq, "\t%lu %d %d %d %d\n",
2044 scc->modem.speed, scc->modem.nrz,
2045 scc->modem.clocksrc, kiss->softdcd,
2046 stat->bufsize);
2047 seq_printf(seq, "\t%lu %lu %lu %lu\n",
2048 stat->rxints, stat->txints, stat->exints, stat->spints);
2049 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2050 stat->rxframes, stat->rxerrs, stat->rx_over,
2051 stat->txframes, stat->txerrs, stat->tx_under,
2052 stat->nospace, stat->tx_state);
2053
2054 #define K(x) kiss->x
2055 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2056 K(txdelay), K(persist), K(slottime), K(tailtime),
2057 K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2058 K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2059 #undef K
2060 #ifdef SCC_DEBUG
2061 {
2062 int reg;
2063
2064 seq_printf(seq, "\tW ");
2065 for (reg = 0; reg < 16; reg++)
2066 seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2067 seq_printf(seq, "\n");
2068
2069 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2070 for (reg = 3; reg < 8; reg++)
2071 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2072 seq_printf(seq, "XX ");
2073 for (reg = 9; reg < 16; reg++)
2074 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2075 seq_printf(seq, "\n");
2076 }
2077 #endif
2078 seq_putc(seq, '\n');
2079 }
2080
2081 return 0;
2082 }
2083
2084 static struct seq_operations scc_net_seq_ops = {
2085 .start = scc_net_seq_start,
2086 .next = scc_net_seq_next,
2087 .stop = scc_net_seq_stop,
2088 .show = scc_net_seq_show,
2089 };
2090
2091
2092 static int scc_net_seq_open(struct inode *inode, struct file *file)
2093 {
2094 return seq_open(file, &scc_net_seq_ops);
2095 }
2096
2097 static struct file_operations scc_net_seq_fops = {
2098 .owner = THIS_MODULE,
2099 .open = scc_net_seq_open,
2100 .read = seq_read,
2101 .llseek = seq_lseek,
2102 .release = seq_release_private,
2103 };
2104
2105 #endif /* CONFIG_PROC_FS */
2106
2107
2108 /* ******************************************************************** */
2109 /* * Init SCC driver * */
2110 /* ******************************************************************** */
2111
2112 static int __init scc_init_driver (void)
2113 {
2114 char devname[IFNAMSIZ];
2115
2116 printk(banner);
2117
2118 sprintf(devname,"%s0", SCC_DriverName);
2119
2120 rtnl_lock();
2121 if (scc_net_alloc(devname, SCC_Info)) {
2122 rtnl_unlock();
2123 printk(KERN_ERR "z8530drv: cannot initialize module\n");
2124 return -EIO;
2125 }
2126 rtnl_unlock();
2127
2128 proc_net_fops_create("z8530drv", 0, &scc_net_seq_fops);
2129
2130 return 0;
2131 }
2132
2133 static void __exit scc_cleanup_driver(void)
2134 {
2135 io_port ctrl;
2136 int k;
2137 struct scc_channel *scc;
2138 struct net_device *dev;
2139
2140 if (Nchips == 0 && (dev = SCC_Info[0].dev))
2141 {
2142 unregister_netdev(dev);
2143 free_netdev(dev);
2144 }
2145
2146 /* Guard against chip prattle */
2147 local_irq_disable();
2148
2149 for (k = 0; k < Nchips; k++)
2150 if ( (ctrl = SCC_ctrl[k].chan_A) )
2151 {
2152 Outb(ctrl, 0);
2153 OutReg(ctrl,R9,FHWRES); /* force hardware reset */
2154 udelay(50);
2155 }
2156
2157 /* To unload the port must be closed so no real IRQ pending */
2158 for (k=0; k < NR_IRQS ; k++)
2159 if (Ivec[k].used) free_irq(k, NULL);
2160
2161 local_irq_enable();
2162
2163 /* Now clean up */
2164 for (k = 0; k < Nchips*2; k++)
2165 {
2166 scc = &SCC_Info[k];
2167 if (scc->ctrl)
2168 {
2169 release_region(scc->ctrl, 1);
2170 release_region(scc->data, 1);
2171 }
2172 if (scc->dev)
2173 {
2174 unregister_netdev(scc->dev);
2175 free_netdev(scc->dev);
2176 }
2177 }
2178
2179
2180 if (Vector_Latch)
2181 release_region(Vector_Latch, 1);
2182
2183 proc_net_remove("z8530drv");
2184 }
2185
2186 MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2187 MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2188 MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2189 MODULE_LICENSE("GPL");
2190 module_init(scc_init_driver);
2191 module_exit(scc_cleanup_driver);
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