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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / hamradio / scc.c
blob33655814448e3a5485cce6d923961c615c986781
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/system.h>
181 #include <asm/io.h>
182 #include <asm/uaccess.h>
183
184 #include "z8530.h"
185
186 static const char banner[] __initdata = KERN_INFO \
187 "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 void scc_init_timer(struct scc_channel *scc);
205
206 static int scc_net_alloc(const char *name, struct scc_channel *scc);
207 static void scc_net_setup(struct net_device *dev);
208 static int scc_net_open(struct net_device *dev);
209 static int scc_net_close(struct net_device *dev);
210 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb);
211 static netdev_tx_t scc_net_tx(struct sk_buff *skb,
212 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_empty(&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)
631 {
632 int chip_irq = (long) dev_id;
633 unsigned char vector;
634 struct scc_channel *scc;
635 struct scc_ctrl *ctrl;
636 int k;
637
638 if (Vector_Latch)
639 {
640 for(k=0; k < SCC_IRQTIMEOUT; k++)
641 {
642 Outb(Vector_Latch, 0); /* Generate INTACK */
643
644 /* Read the vector */
645 if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break;
646 if (vector & 0x01) break;
647
648 scc=&SCC_Info[vector >> 3 ^ 0x01];
649 if (!scc->dev) break;
650
651 scc_isr_dispatch(scc, vector);
652
653 OutReg(scc->ctrl,R0,RES_H_IUS); /* Reset Highest IUS */
654 }
655
656 if (k == SCC_IRQTIMEOUT)
657 printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n");
658
659 return IRQ_HANDLED;
660 }
661
662 /* Find the SCC generating the interrupt by polling all attached SCCs
663 * reading RR3A (the interrupt pending register)
664 */
665
666 ctrl = SCC_ctrl;
667 while (ctrl->chan_A)
668 {
669 if (ctrl->irq != chip_irq)
670 {
671 ctrl++;
672 continue;
673 }
674
675 scc = NULL;
676 for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++)
677 {
678 vector=InReg(ctrl->chan_B,R2); /* Read the vector */
679 if (vector & 0x01) break;
680
681 scc = &SCC_Info[vector >> 3 ^ 0x01];
682 if (!scc->dev) break;
683
684 scc_isr_dispatch(scc, vector);
685 }
686
687 if (k == SCC_IRQTIMEOUT)
688 {
689 printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n");
690 break;
691 }
692
693 /* This looks weird and it is. At least the BayCom USCC doesn't
694 * use the Interrupt Daisy Chain, thus we'll have to start
695 * all over again to be sure not to miss an interrupt from
696 * (any of) the other chip(s)...
697 * Honestly, the situation *is* braindamaged...
698 */
699
700 if (scc != NULL)
701 {
702 OutReg(scc->ctrl,R0,RES_H_IUS);
703 ctrl = SCC_ctrl;
704 } else
705 ctrl++;
706 }
707 return IRQ_HANDLED;
708 }
709
710
711
712 /* ******************************************************************** */
713 /* * Init Channel */
714 /* ******************************************************************** */
715
716
717 /* ----> set SCC channel speed <---- */
718
719 static inline void set_brg(struct scc_channel *scc, unsigned int tc)
720 {
721 cl(scc,R14,BRENABL); /* disable baudrate generator */
722 wr(scc,R12,tc & 255); /* brg rate LOW */
723 wr(scc,R13,tc >> 8); /* brg rate HIGH */
724 or(scc,R14,BRENABL); /* enable baudrate generator */
725 }
726
727 static inline void set_speed(struct scc_channel *scc)
728 {
729 unsigned long flags;
730 spin_lock_irqsave(&scc->lock, flags);
731
732 if (scc->modem.speed > 0) /* paranoia... */
733 set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2);
734
735 spin_unlock_irqrestore(&scc->lock, flags);
736 }
737
738
739 /* ----> initialize a SCC channel <---- */
740
741 static inline void init_brg(struct scc_channel *scc)
742 {
743 wr(scc, R14, BRSRC); /* BRG source = PCLK */
744 OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]); /* DPLL source = BRG */
745 OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]); /* DPLL NRZI mode */
746 }
747
748 /*
749 * Initialization according to the Z8530 manual (SGS-Thomson's version):
750 *
751 * 1. Modes and constants
752 *
753 * WR9 11000000 chip reset
754 * WR4 XXXXXXXX Tx/Rx control, async or sync mode
755 * WR1 0XX00X00 select W/REQ (optional)
756 * WR2 XXXXXXXX program interrupt vector
757 * WR3 XXXXXXX0 select Rx control
758 * WR5 XXXX0XXX select Tx control
759 * WR6 XXXXXXXX sync character
760 * WR7 XXXXXXXX sync character
761 * WR9 000X0XXX select interrupt control
762 * WR10 XXXXXXXX miscellaneous control (optional)
763 * WR11 XXXXXXXX clock control
764 * WR12 XXXXXXXX time constant lower byte (optional)
765 * WR13 XXXXXXXX time constant upper byte (optional)
766 * WR14 XXXXXXX0 miscellaneous control
767 * WR14 XXXSSSSS commands (optional)
768 *
769 * 2. Enables
770 *
771 * WR14 000SSSS1 baud rate enable
772 * WR3 SSSSSSS1 Rx enable
773 * WR5 SSSS1SSS Tx enable
774 * WR0 10000000 reset Tx CRG (optional)
775 * WR1 XSS00S00 DMA enable (optional)
776 *
777 * 3. Interrupt status
778 *
779 * WR15 XXXXXXXX enable external/status
780 * WR0 00010000 reset external status
781 * WR0 00010000 reset external status twice
782 * WR1 SSSXXSXX enable Rx, Tx and Ext/status
783 * WR9 000SXSSS enable master interrupt enable
784 *
785 * 1 = set to one, 0 = reset to zero
786 * X = user defined, S = same as previous init
787 *
788 *
789 * Note that the implementation differs in some points from above scheme.
790 *
791 */
792
793 static void init_channel(struct scc_channel *scc)
794 {
795 del_timer(&scc->tx_t);
796 del_timer(&scc->tx_wdog);
797
798 disable_irq(scc->irq);
799
800 wr(scc,R4,X1CLK|SDLC); /* *1 clock, SDLC mode */
801 wr(scc,R1,0); /* no W/REQ operation */
802 wr(scc,R3,Rx8|RxCRC_ENAB); /* RX 8 bits/char, CRC, disabled */
803 wr(scc,R5,Tx8|DTR|TxCRC_ENAB); /* TX 8 bits/char, disabled, DTR */
804 wr(scc,R6,0); /* SDLC address zero (not used) */
805 wr(scc,R7,FLAG); /* SDLC flag value */
806 wr(scc,R9,VIS); /* vector includes status */
807 wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */
808 wr(scc,R14, 0);
809
810
811 /* set clock sources:
812
813 CLK_DPLL: normal halfduplex operation
814
815 RxClk: use DPLL
816 TxClk: use DPLL
817 TRxC mode DPLL output
818
819 CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem)
820
821 BayCom: others:
822
823 TxClk = pin RTxC TxClk = pin TRxC
824 RxClk = pin TRxC RxClk = pin RTxC
825
826
827 CLK_DIVIDER:
828 RxClk = use DPLL
829 TxClk = pin RTxC
830
831 BayCom: others:
832 pin TRxC = DPLL pin TRxC = BRG
833 (RxClk * 1) (RxClk * 32)
834 */
835
836
837 switch(scc->modem.clocksrc)
838 {
839 case CLK_DPLL:
840 wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
841 init_brg(scc);
842 break;
843
844 case CLK_DIVIDER:
845 wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI);
846 init_brg(scc);
847 break;
848
849 case CLK_EXTERNAL:
850 wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP);
851 OutReg(scc->ctrl, R14, DISDPLL);
852 break;
853
854 }
855
856 set_speed(scc); /* set baudrate */
857
858 if(scc->enhanced)
859 {
860 or(scc,R15,SHDLCE|FIFOE); /* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */
861 wr(scc,R7,AUTOEOM);
862 }
863
864 if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD))
865 /* DCD is now ON */
866 {
867 start_hunt(scc);
868 }
869
870 /* enable ABORT, DCD & SYNC/HUNT interrupts */
871
872 wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE));
873
874 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
875 Outb(scc->ctrl,RES_EXT_INT); /* must be done twice */
876
877 or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */
878
879 scc->status = InReg(scc->ctrl,R0); /* read initial status */
880
881 or(scc,R9,MIE); /* master interrupt enable */
882
883 scc_init_timer(scc);
884
885 enable_irq(scc->irq);
886 }
887
888
889
890
891 /* ******************************************************************** */
892 /* * SCC timer functions * */
893 /* ******************************************************************** */
894
895
896 /* ----> scc_key_trx sets the time constant for the baudrate
897 generator and keys the transmitter <---- */
898
899 static void scc_key_trx(struct scc_channel *scc, char tx)
900 {
901 unsigned int time_const;
902
903 if (scc->brand & PRIMUS)
904 Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0));
905
906 if (scc->modem.speed < 300)
907 scc->modem.speed = 1200;
908
909 time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2;
910
911 disable_irq(scc->irq);
912
913 if (tx)
914 {
915 or(scc, R1, TxINT_ENAB); /* t_maxkeyup may have reset these */
916 or(scc, R15, TxUIE);
917 }
918
919 if (scc->modem.clocksrc == CLK_DPLL)
920 { /* force simplex operation */
921 if (tx)
922 {
923 #ifdef CONFIG_SCC_TRXECHO
924 cl(scc, R3, RxENABLE|ENT_HM); /* switch off receiver */
925 cl(scc, R15, DCDIE|SYNCIE); /* No DCD changes, please */
926 #endif
927 set_brg(scc, time_const); /* reprogram baudrate generator */
928
929 /* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */
930 wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR);
931
932 /* By popular demand: tx_inhibit */
933 if (scc->kiss.tx_inhibit)
934 {
935 or(scc,R5, TxENAB);
936 scc->wreg[R5] |= RTS;
937 } else {
938 or(scc,R5,RTS|TxENAB); /* set the RTS line and enable TX */
939 }
940 } else {
941 cl(scc,R5,RTS|TxENAB);
942
943 set_brg(scc, time_const); /* reprogram baudrate generator */
944
945 /* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */
946 wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
947
948 #ifndef CONFIG_SCC_TRXECHO
949 if (scc->kiss.softdcd)
950 #endif
951 {
952 or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE);
953 start_hunt(scc);
954 }
955 }
956 } else {
957 if (tx)
958 {
959 #ifdef CONFIG_SCC_TRXECHO
960 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
961 {
962 cl(scc, R3, RxENABLE);
963 cl(scc, R15, DCDIE|SYNCIE);
964 }
965 #endif
966
967 if (scc->kiss.tx_inhibit)
968 {
969 or(scc,R5, TxENAB);
970 scc->wreg[R5] |= RTS;
971 } else {
972 or(scc,R5,RTS|TxENAB); /* enable tx */
973 }
974 } else {
975 cl(scc,R5,RTS|TxENAB); /* disable tx */
976
977 if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) &&
978 #ifndef CONFIG_SCC_TRXECHO
979 scc->kiss.softdcd)
980 #else
981 1)
982 #endif
983 {
984 or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE);
985 start_hunt(scc);
986 }
987 }
988 }
989
990 enable_irq(scc->irq);
991 }
992
993
994 /* ----> SCC timer interrupt handler and friends. <---- */
995
996 static void __scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
997 {
998 del_timer(&scc->tx_t);
999
1000 if (when == 0)
1001 {
1002 handler((unsigned long) scc);
1003 } else
1004 if (when != TIMER_OFF)
1005 {
1006 scc->tx_t.data = (unsigned long) scc;
1007 scc->tx_t.function = handler;
1008 scc->tx_t.expires = jiffies + (when*HZ)/100;
1009 add_timer(&scc->tx_t);
1010 }
1011 }
1012
1013 static void scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
1014 {
1015 unsigned long flags;
1016
1017 spin_lock_irqsave(&scc->lock, flags);
1018 __scc_start_tx_timer(scc, handler, when);
1019 spin_unlock_irqrestore(&scc->lock, flags);
1020 }
1021
1022 static void scc_start_defer(struct scc_channel *scc)
1023 {
1024 unsigned long flags;
1025
1026 spin_lock_irqsave(&scc->lock, flags);
1027 del_timer(&scc->tx_wdog);
1028
1029 if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF)
1030 {
1031 scc->tx_wdog.data = (unsigned long) scc;
1032 scc->tx_wdog.function = t_busy;
1033 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer;
1034 add_timer(&scc->tx_wdog);
1035 }
1036 spin_unlock_irqrestore(&scc->lock, flags);
1037 }
1038
1039 static void scc_start_maxkeyup(struct scc_channel *scc)
1040 {
1041 unsigned long flags;
1042
1043 spin_lock_irqsave(&scc->lock, flags);
1044 del_timer(&scc->tx_wdog);
1045
1046 if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF)
1047 {
1048 scc->tx_wdog.data = (unsigned long) scc;
1049 scc->tx_wdog.function = t_maxkeyup;
1050 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup;
1051 add_timer(&scc->tx_wdog);
1052 }
1053 spin_unlock_irqrestore(&scc->lock, flags);
1054 }
1055
1056 /*
1057 * This is called from scc_txint() when there are no more frames to send.
1058 * Not exactly a timer function, but it is a close friend of the family...
1059 */
1060
1061 static void scc_tx_done(struct scc_channel *scc)
1062 {
1063 /*
1064 * trx remains keyed in fulldup mode 2 until t_idle expires.
1065 */
1066
1067 switch (scc->kiss.fulldup)
1068 {
1069 case KISS_DUPLEX_LINK:
1070 scc->stat.tx_state = TXS_IDLE2;
1071 if (scc->kiss.idletime != TIMER_OFF)
1072 scc_start_tx_timer(scc, t_idle,
1073 scc->kiss.idletime*100);
1074 break;
1075 case KISS_DUPLEX_OPTIMA:
1076 scc_notify(scc, HWEV_ALL_SENT);
1077 break;
1078 default:
1079 scc->stat.tx_state = TXS_BUSY;
1080 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1081 }
1082
1083 netif_wake_queue(scc->dev);
1084 }
1085
1086
1087 static unsigned char Rand = 17;
1088
1089 static inline int is_grouped(struct scc_channel *scc)
1090 {
1091 int k;
1092 struct scc_channel *scc2;
1093 unsigned char grp1, grp2;
1094
1095 grp1 = scc->kiss.group;
1096
1097 for (k = 0; k < (Nchips * 2); k++)
1098 {
1099 scc2 = &SCC_Info[k];
1100 grp2 = scc2->kiss.group;
1101
1102 if (scc2 == scc || !(scc2->dev && grp2))
1103 continue;
1104
1105 if ((grp1 & 0x3f) == (grp2 & 0x3f))
1106 {
1107 if ( (grp1 & TXGROUP) && (scc2->wreg[R5] & RTS) )
1108 return 1;
1109
1110 if ( (grp1 & RXGROUP) && scc2->dcd )
1111 return 1;
1112 }
1113 }
1114 return 0;
1115 }
1116
1117 /* DWAIT and SLOTTIME expired
1118 *
1119 * fulldup == 0: DCD is active or Rand > P-persistence: start t_busy timer
1120 * else key trx and start txdelay
1121 * fulldup == 1: key trx and start txdelay
1122 * fulldup == 2: mintime expired, reset status or key trx and start txdelay
1123 */
1124
1125 static void t_dwait(unsigned long channel)
1126 {
1127 struct scc_channel *scc = (struct scc_channel *) channel;
1128
1129 if (scc->stat.tx_state == TXS_WAIT) /* maxkeyup or idle timeout */
1130 {
1131 if (skb_queue_empty(&scc->tx_queue)) { /* nothing to send */
1132 scc->stat.tx_state = TXS_IDLE;
1133 netif_wake_queue(scc->dev); /* t_maxkeyup locked it. */
1134 return;
1135 }
1136
1137 scc->stat.tx_state = TXS_BUSY;
1138 }
1139
1140 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1141 {
1142 Rand = Rand * 17 + 31;
1143
1144 if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) )
1145 {
1146 scc_start_defer(scc);
1147 scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime);
1148 return ;
1149 }
1150 }
1151
1152 if ( !(scc->wreg[R5] & RTS) )
1153 {
1154 scc_key_trx(scc, TX_ON);
1155 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1156 } else {
1157 scc_start_tx_timer(scc, t_txdelay, 0);
1158 }
1159 }
1160
1161
1162 /* TXDELAY expired
1163 *
1164 * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog.
1165 */
1166
1167 static void t_txdelay(unsigned long channel)
1168 {
1169 struct scc_channel *scc = (struct scc_channel *) channel;
1170
1171 scc_start_maxkeyup(scc);
1172
1173 if (scc->tx_buff == NULL)
1174 {
1175 disable_irq(scc->irq);
1176 scc_txint(scc);
1177 enable_irq(scc->irq);
1178 }
1179 }
1180
1181
1182 /* TAILTIME expired
1183 *
1184 * switch off transmitter. If we were stopped by Maxkeyup restart
1185 * transmission after 'mintime' seconds
1186 */
1187
1188 static void t_tail(unsigned long channel)
1189 {
1190 struct scc_channel *scc = (struct scc_channel *) channel;
1191 unsigned long flags;
1192
1193 spin_lock_irqsave(&scc->lock, flags);
1194 del_timer(&scc->tx_wdog);
1195 scc_key_trx(scc, TX_OFF);
1196 spin_unlock_irqrestore(&scc->lock, flags);
1197
1198 if (scc->stat.tx_state == TXS_TIMEOUT) /* we had a timeout? */
1199 {
1200 scc->stat.tx_state = TXS_WAIT;
1201 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1202 return;
1203 }
1204
1205 scc->stat.tx_state = TXS_IDLE;
1206 netif_wake_queue(scc->dev);
1207 }
1208
1209
1210 /* BUSY timeout
1211 *
1212 * throw away send buffers if DCD remains active too long.
1213 */
1214
1215 static void t_busy(unsigned long channel)
1216 {
1217 struct scc_channel *scc = (struct scc_channel *) channel;
1218
1219 del_timer(&scc->tx_t);
1220 netif_stop_queue(scc->dev); /* don't pile on the wabbit! */
1221
1222 scc_discard_buffers(scc);
1223 scc->stat.txerrs++;
1224 scc->stat.tx_state = TXS_IDLE;
1225
1226 netif_wake_queue(scc->dev);
1227 }
1228
1229 /* MAXKEYUP timeout
1230 *
1231 * this is our watchdog.
1232 */
1233
1234 static void t_maxkeyup(unsigned long channel)
1235 {
1236 struct scc_channel *scc = (struct scc_channel *) channel;
1237 unsigned long flags;
1238
1239 spin_lock_irqsave(&scc->lock, flags);
1240 /*
1241 * let things settle down before we start to
1242 * accept new data.
1243 */
1244
1245 netif_stop_queue(scc->dev);
1246 scc_discard_buffers(scc);
1247
1248 del_timer(&scc->tx_t);
1249
1250 cl(scc, R1, TxINT_ENAB); /* force an ABORT, but don't */
1251 cl(scc, R15, TxUIE); /* count it. */
1252 OutReg(scc->ctrl, R0, RES_Tx_P);
1253
1254 spin_unlock_irqrestore(&scc->lock, flags);
1255
1256 scc->stat.txerrs++;
1257 scc->stat.tx_state = TXS_TIMEOUT;
1258 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1259 }
1260
1261 /* IDLE timeout
1262 *
1263 * in fulldup mode 2 it keys down the transmitter after 'idle' seconds
1264 * of inactivity. We will not restart transmission before 'mintime'
1265 * expires.
1266 */
1267
1268 static void t_idle(unsigned long channel)
1269 {
1270 struct scc_channel *scc = (struct scc_channel *) channel;
1271
1272 del_timer(&scc->tx_wdog);
1273
1274 scc_key_trx(scc, TX_OFF);
1275 if(scc->kiss.mintime)
1276 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1277 scc->stat.tx_state = TXS_WAIT;
1278 }
1279
1280 static void scc_init_timer(struct scc_channel *scc)
1281 {
1282 unsigned long flags;
1283
1284 spin_lock_irqsave(&scc->lock, flags);
1285 scc->stat.tx_state = TXS_IDLE;
1286 spin_unlock_irqrestore(&scc->lock, flags);
1287 }
1288
1289
1290 /* ******************************************************************** */
1291 /* * Set/get L1 parameters * */
1292 /* ******************************************************************** */
1293
1294
1295 /*
1296 * this will set the "hardware" parameters through KISS commands or ioctl()
1297 */
1298
1299 #define CAST(x) (unsigned long)(x)
1300
1301 static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg)
1302 {
1303 switch (cmd)
1304 {
1305 case PARAM_TXDELAY: scc->kiss.txdelay=arg; break;
1306 case PARAM_PERSIST: scc->kiss.persist=arg; break;
1307 case PARAM_SLOTTIME: scc->kiss.slottime=arg; break;
1308 case PARAM_TXTAIL: scc->kiss.tailtime=arg; break;
1309 case PARAM_FULLDUP: scc->kiss.fulldup=arg; break;
1310 case PARAM_DTR: break; /* does someone need this? */
1311 case PARAM_GROUP: scc->kiss.group=arg; break;
1312 case PARAM_IDLE: scc->kiss.idletime=arg; break;
1313 case PARAM_MIN: scc->kiss.mintime=arg; break;
1314 case PARAM_MAXKEY: scc->kiss.maxkeyup=arg; break;
1315 case PARAM_WAIT: scc->kiss.waittime=arg; break;
1316 case PARAM_MAXDEFER: scc->kiss.maxdefer=arg; break;
1317 case PARAM_TX: scc->kiss.tx_inhibit=arg; break;
1318
1319 case PARAM_SOFTDCD:
1320 scc->kiss.softdcd=arg;
1321 if (arg)
1322 {
1323 or(scc, R15, SYNCIE);
1324 cl(scc, R15, DCDIE);
1325 start_hunt(scc);
1326 } else {
1327 or(scc, R15, DCDIE);
1328 cl(scc, R15, SYNCIE);
1329 }
1330 break;
1331
1332 case PARAM_SPEED:
1333 if (arg < 256)
1334 scc->modem.speed=arg*100;
1335 else
1336 scc->modem.speed=arg;
1337
1338 if (scc->stat.tx_state == 0) /* only switch baudrate on rx... ;-) */
1339 set_speed(scc);
1340 break;
1341
1342 case PARAM_RTS:
1343 if ( !(scc->wreg[R5] & RTS) )
1344 {
1345 if (arg != TX_OFF) {
1346 scc_key_trx(scc, TX_ON);
1347 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1348 }
1349 } else {
1350 if (arg == TX_OFF)
1351 {
1352 scc->stat.tx_state = TXS_BUSY;
1353 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1354 }
1355 }
1356 break;
1357
1358 case PARAM_HWEVENT:
1359 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1360 break;
1361
1362 default: return -EINVAL;
1363 }
1364
1365 return 0;
1366 }
1367
1368
1369
1370 static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1371 {
1372 switch (cmd)
1373 {
1374 case PARAM_TXDELAY: return CAST(scc->kiss.txdelay);
1375 case PARAM_PERSIST: return CAST(scc->kiss.persist);
1376 case PARAM_SLOTTIME: return CAST(scc->kiss.slottime);
1377 case PARAM_TXTAIL: return CAST(scc->kiss.tailtime);
1378 case PARAM_FULLDUP: return CAST(scc->kiss.fulldup);
1379 case PARAM_SOFTDCD: return CAST(scc->kiss.softdcd);
1380 case PARAM_DTR: return CAST((scc->wreg[R5] & DTR)? 1:0);
1381 case PARAM_RTS: return CAST((scc->wreg[R5] & RTS)? 1:0);
1382 case PARAM_SPEED: return CAST(scc->modem.speed);
1383 case PARAM_GROUP: return CAST(scc->kiss.group);
1384 case PARAM_IDLE: return CAST(scc->kiss.idletime);
1385 case PARAM_MIN: return CAST(scc->kiss.mintime);
1386 case PARAM_MAXKEY: return CAST(scc->kiss.maxkeyup);
1387 case PARAM_WAIT: return CAST(scc->kiss.waittime);
1388 case PARAM_MAXDEFER: return CAST(scc->kiss.maxdefer);
1389 case PARAM_TX: return CAST(scc->kiss.tx_inhibit);
1390 default: return NO_SUCH_PARAM;
1391 }
1392
1393 }
1394
1395 #undef CAST
1396
1397 /* ******************************************************************* */
1398 /* * Send calibration pattern * */
1399 /* ******************************************************************* */
1400
1401 static void scc_stop_calibrate(unsigned long channel)
1402 {
1403 struct scc_channel *scc = (struct scc_channel *) channel;
1404 unsigned long flags;
1405
1406 spin_lock_irqsave(&scc->lock, flags);
1407 del_timer(&scc->tx_wdog);
1408 scc_key_trx(scc, TX_OFF);
1409 wr(scc, R6, 0);
1410 wr(scc, R7, FLAG);
1411 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1412 Outb(scc->ctrl,RES_EXT_INT);
1413
1414 netif_wake_queue(scc->dev);
1415 spin_unlock_irqrestore(&scc->lock, flags);
1416 }
1417
1418
1419 static void
1420 scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1421 {
1422 unsigned long flags;
1423
1424 spin_lock_irqsave(&scc->lock, flags);
1425 netif_stop_queue(scc->dev);
1426 scc_discard_buffers(scc);
1427
1428 del_timer(&scc->tx_wdog);
1429
1430 scc->tx_wdog.data = (unsigned long) scc;
1431 scc->tx_wdog.function = scc_stop_calibrate;
1432 scc->tx_wdog.expires = jiffies + HZ*duration;
1433 add_timer(&scc->tx_wdog);
1434
1435 /* This doesn't seem to work. Why not? */
1436 wr(scc, R6, 0);
1437 wr(scc, R7, pattern);
1438
1439 /*
1440 * Don't know if this works.
1441 * Damn, where is my Z8530 programming manual...?
1442 */
1443
1444 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1445 Outb(scc->ctrl,RES_EXT_INT);
1446
1447 scc_key_trx(scc, TX_ON);
1448 spin_unlock_irqrestore(&scc->lock, flags);
1449 }
1450
1451 /* ******************************************************************* */
1452 /* * Init channel structures, special HW, etc... * */
1453 /* ******************************************************************* */
1454
1455 /*
1456 * Reset the Z8530s and setup special hardware
1457 */
1458
1459 static void z8530_init(void)
1460 {
1461 struct scc_channel *scc;
1462 int chip, k;
1463 unsigned long flags;
1464 char *flag;
1465
1466
1467 printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1468
1469 flag=" ";
1470 for (k = 0; k < nr_irqs; k++)
1471 if (Ivec[k].used)
1472 {
1473 printk("%s%d", flag, k);
1474 flag=",";
1475 }
1476 printk("\n");
1477
1478
1479 /* reset and pre-init all chips in the system */
1480 for (chip = 0; chip < Nchips; chip++)
1481 {
1482 scc=&SCC_Info[2*chip];
1483 if (!scc->ctrl) continue;
1484
1485 /* Special SCC cards */
1486
1487 if(scc->brand & EAGLE) /* this is an EAGLE card */
1488 Outb(scc->special,0x08); /* enable interrupt on the board */
1489
1490 if(scc->brand & (PC100 | PRIMUS)) /* this is a PC100/PRIMUS card */
1491 Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */
1492
1493
1494 /* Reset and pre-init Z8530 */
1495
1496 spin_lock_irqsave(&scc->lock, flags);
1497
1498 Outb(scc->ctrl, 0);
1499 OutReg(scc->ctrl,R9,FHWRES); /* force hardware reset */
1500 udelay(100); /* give it 'a bit' more time than required */
1501 wr(scc, R2, chip*16); /* interrupt vector */
1502 wr(scc, R9, VIS); /* vector includes status */
1503 spin_unlock_irqrestore(&scc->lock, flags);
1504 }
1505
1506
1507 Driver_Initialized = 1;
1508 }
1509
1510 /*
1511 * Allocate device structure, err, instance, and register driver
1512 */
1513
1514 static int scc_net_alloc(const char *name, struct scc_channel *scc)
1515 {
1516 int err;
1517 struct net_device *dev;
1518
1519 dev = alloc_netdev(0, name, scc_net_setup);
1520 if (!dev)
1521 return -ENOMEM;
1522
1523 dev->ml_priv = scc;
1524 scc->dev = dev;
1525 spin_lock_init(&scc->lock);
1526 init_timer(&scc->tx_t);
1527 init_timer(&scc->tx_wdog);
1528
1529 err = register_netdevice(dev);
1530 if (err) {
1531 printk(KERN_ERR "%s: can't register network device (%d)\n",
1532 name, err);
1533 free_netdev(dev);
1534 scc->dev = NULL;
1535 return err;
1536 }
1537
1538 return 0;
1539 }
1540
1541
1542
1543 /* ******************************************************************** */
1544 /* * Network driver methods * */
1545 /* ******************************************************************** */
1546
1547 static const struct net_device_ops scc_netdev_ops = {
1548 .ndo_open = scc_net_open,
1549 .ndo_stop = scc_net_close,
1550 .ndo_start_xmit = scc_net_tx,
1551 .ndo_set_mac_address = scc_net_set_mac_address,
1552 .ndo_get_stats = scc_net_get_stats,
1553 .ndo_do_ioctl = scc_net_ioctl,
1554 };
1555
1556 /* ----> Initialize device <----- */
1557
1558 static void scc_net_setup(struct net_device *dev)
1559 {
1560 dev->tx_queue_len = 16; /* should be enough... */
1561
1562 dev->netdev_ops = &scc_netdev_ops;
1563 dev->header_ops = &ax25_header_ops;
1564
1565 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1566 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
1567
1568 dev->flags = 0;
1569
1570 dev->type = ARPHRD_AX25;
1571 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1572 dev->mtu = AX25_DEF_PACLEN;
1573 dev->addr_len = AX25_ADDR_LEN;
1574
1575 }
1576
1577 /* ----> open network device <---- */
1578
1579 static int scc_net_open(struct net_device *dev)
1580 {
1581 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1582
1583 if (!scc->init)
1584 return -EINVAL;
1585
1586 scc->tx_buff = NULL;
1587 skb_queue_head_init(&scc->tx_queue);
1588
1589 init_channel(scc);
1590
1591 netif_start_queue(dev);
1592 return 0;
1593 }
1594
1595 /* ----> close network device <---- */
1596
1597 static int scc_net_close(struct net_device *dev)
1598 {
1599 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1600 unsigned long flags;
1601
1602 netif_stop_queue(dev);
1603
1604 spin_lock_irqsave(&scc->lock, flags);
1605 Outb(scc->ctrl,0); /* Make sure pointer is written */
1606 wr(scc,R1,0); /* disable interrupts */
1607 wr(scc,R3,0);
1608 spin_unlock_irqrestore(&scc->lock, flags);
1609
1610 del_timer_sync(&scc->tx_t);
1611 del_timer_sync(&scc->tx_wdog);
1612
1613 scc_discard_buffers(scc);
1614
1615 return 0;
1616 }
1617
1618 /* ----> receive frame, called from scc_rxint() <---- */
1619
1620 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1621 {
1622 if (skb->len == 0) {
1623 dev_kfree_skb_irq(skb);
1624 return;
1625 }
1626
1627 scc->dev_stat.rx_packets++;
1628 scc->dev_stat.rx_bytes += skb->len;
1629
1630 skb->protocol = ax25_type_trans(skb, scc->dev);
1631
1632 netif_rx(skb);
1633 }
1634
1635 /* ----> transmit frame <---- */
1636
1637 static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1638 {
1639 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1640 unsigned long flags;
1641 char kisscmd;
1642
1643 if (skb->len > scc->stat.bufsize || skb->len < 2) {
1644 scc->dev_stat.tx_dropped++; /* bogus frame */
1645 dev_kfree_skb(skb);
1646 return NETDEV_TX_OK;
1647 }
1648
1649 scc->dev_stat.tx_packets++;
1650 scc->dev_stat.tx_bytes += skb->len;
1651 scc->stat.txframes++;
1652
1653 kisscmd = *skb->data & 0x1f;
1654 skb_pull(skb, 1);
1655
1656 if (kisscmd) {
1657 scc_set_param(scc, kisscmd, *skb->data);
1658 dev_kfree_skb(skb);
1659 return NETDEV_TX_OK;
1660 }
1661
1662 spin_lock_irqsave(&scc->lock, flags);
1663
1664 if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1665 struct sk_buff *skb_del;
1666 skb_del = skb_dequeue(&scc->tx_queue);
1667 dev_kfree_skb(skb_del);
1668 }
1669 skb_queue_tail(&scc->tx_queue, skb);
1670 dev->trans_start = jiffies;
1671
1672
1673 /*
1674 * Start transmission if the trx state is idle or
1675 * t_idle hasn't expired yet. Use dwait/persistence/slottime
1676 * algorithm for normal halfduplex operation.
1677 */
1678
1679 if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1680 scc->stat.tx_state = TXS_BUSY;
1681 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1682 __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1683 else
1684 __scc_start_tx_timer(scc, t_dwait, 0);
1685 }
1686 spin_unlock_irqrestore(&scc->lock, flags);
1687 return NETDEV_TX_OK;
1688 }
1689
1690 /* ----> ioctl functions <---- */
1691
1692 /*
1693 * SIOCSCCCFG - configure driver arg: (struct scc_hw_config *) arg
1694 * SIOCSCCINI - initialize driver arg: ---
1695 * SIOCSCCCHANINI - initialize channel arg: (struct scc_modem *) arg
1696 * SIOCSCCSMEM - set memory arg: (struct scc_mem_config *) arg
1697 * SIOCSCCGKISS - get level 1 parameter arg: (struct scc_kiss_cmd *) arg
1698 * SIOCSCCSKISS - set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1699 * SIOCSCCGSTAT - get driver status arg: (struct scc_stat *) arg
1700 * SIOCSCCCAL - send calib. pattern arg: (struct scc_calibrate *) arg
1701 */
1702
1703 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1704 {
1705 struct scc_kiss_cmd kiss_cmd;
1706 struct scc_mem_config memcfg;
1707 struct scc_hw_config hwcfg;
1708 struct scc_calibrate cal;
1709 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1710 int chan;
1711 unsigned char device_name[IFNAMSIZ];
1712 void __user *arg = ifr->ifr_data;
1713
1714
1715 if (!Driver_Initialized)
1716 {
1717 if (cmd == SIOCSCCCFG)
1718 {
1719 int found = 1;
1720
1721 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1722 if (!arg) return -EFAULT;
1723
1724 if (Nchips >= SCC_MAXCHIPS)
1725 return -EINVAL;
1726
1727 if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1728 return -EFAULT;
1729
1730 if (hwcfg.irq == 2) hwcfg.irq = 9;
1731
1732 if (hwcfg.irq < 0 || hwcfg.irq >= nr_irqs)
1733 return -EINVAL;
1734
1735 if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1736 {
1737 if (request_irq(hwcfg.irq, scc_isr,
1738 IRQF_DISABLED, "AX.25 SCC",
1739 (void *)(long) hwcfg.irq))
1740 printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1741 else
1742 Ivec[hwcfg.irq].used = 1;
1743 }
1744
1745 if (hwcfg.vector_latch && !Vector_Latch) {
1746 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1747 printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1748 else
1749 Vector_Latch = hwcfg.vector_latch;
1750 }
1751
1752 if (hwcfg.clock == 0)
1753 hwcfg.clock = SCC_DEFAULT_CLOCK;
1754
1755 #ifndef SCC_DONT_CHECK
1756
1757 if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1758 {
1759 disable_irq(hwcfg.irq);
1760 Outb(hwcfg.ctrl_a, 0);
1761 OutReg(hwcfg.ctrl_a, R9, FHWRES);
1762 udelay(100);
1763 OutReg(hwcfg.ctrl_a,R13,0x55); /* is this chip really there? */
1764 udelay(5);
1765
1766 if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1767 found = 0;
1768 enable_irq(hwcfg.irq);
1769 release_region(hwcfg.ctrl_a, 1);
1770 }
1771 else
1772 found = 0;
1773 #endif
1774
1775 if (found)
1776 {
1777 SCC_Info[2*Nchips ].ctrl = hwcfg.ctrl_a;
1778 SCC_Info[2*Nchips ].data = hwcfg.data_a;
1779 SCC_Info[2*Nchips ].irq = hwcfg.irq;
1780 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1781 SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1782 SCC_Info[2*Nchips+1].irq = hwcfg.irq;
1783
1784 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1785 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1786 SCC_ctrl[Nchips].irq = hwcfg.irq;
1787 }
1788
1789
1790 for (chan = 0; chan < 2; chan++)
1791 {
1792 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1793
1794 SCC_Info[2*Nchips+chan].special = hwcfg.special;
1795 SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1796 SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1797 SCC_Info[2*Nchips+chan].option = hwcfg.option;
1798 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1799
1800 #ifdef SCC_DONT_CHECK
1801 printk(KERN_INFO "%s: data port = 0x%3.3x control port = 0x%3.3x\n",
1802 device_name,
1803 SCC_Info[2*Nchips+chan].data,
1804 SCC_Info[2*Nchips+chan].ctrl);
1805
1806 #else
1807 printk(KERN_INFO "%s: data port = 0x%3.3lx control port = 0x%3.3lx -- %s\n",
1808 device_name,
1809 chan? hwcfg.data_b : hwcfg.data_a,
1810 chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1811 found? "found" : "missing");
1812 #endif
1813
1814 if (found)
1815 {
1816 request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1817 request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1818 if (Nchips+chan != 0 &&
1819 scc_net_alloc(device_name,
1820 &SCC_Info[2*Nchips+chan]))
1821 return -EINVAL;
1822 }
1823 }
1824
1825 if (found) Nchips++;
1826
1827 return 0;
1828 }
1829
1830 if (cmd == SIOCSCCINI)
1831 {
1832 if (!capable(CAP_SYS_RAWIO))
1833 return -EPERM;
1834
1835 if (Nchips == 0)
1836 return -EINVAL;
1837
1838 z8530_init();
1839 return 0;
1840 }
1841
1842 return -EINVAL; /* confuse the user */
1843 }
1844
1845 if (!scc->init)
1846 {
1847 if (cmd == SIOCSCCCHANINI)
1848 {
1849 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1850 if (!arg) return -EINVAL;
1851
1852 scc->stat.bufsize = SCC_BUFSIZE;
1853
1854 if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1855 return -EINVAL;
1856
1857 /* default KISS Params */
1858
1859 if (scc->modem.speed < 4800)
1860 {
1861 scc->kiss.txdelay = 36; /* 360 ms */
1862 scc->kiss.persist = 42; /* 25% persistence */ /* was 25 */
1863 scc->kiss.slottime = 16; /* 160 ms */
1864 scc->kiss.tailtime = 4; /* minimal reasonable value */
1865 scc->kiss.fulldup = 0; /* CSMA */
1866 scc->kiss.waittime = 50; /* 500 ms */
1867 scc->kiss.maxkeyup = 10; /* 10 s */
1868 scc->kiss.mintime = 3; /* 3 s */
1869 scc->kiss.idletime = 30; /* 30 s */
1870 scc->kiss.maxdefer = 120; /* 2 min */
1871 scc->kiss.softdcd = 0; /* hardware dcd */
1872 } else {
1873 scc->kiss.txdelay = 10; /* 100 ms */
1874 scc->kiss.persist = 64; /* 25% persistence */ /* was 25 */
1875 scc->kiss.slottime = 8; /* 160 ms */
1876 scc->kiss.tailtime = 1; /* minimal reasonable value */
1877 scc->kiss.fulldup = 0; /* CSMA */
1878 scc->kiss.waittime = 50; /* 500 ms */
1879 scc->kiss.maxkeyup = 7; /* 7 s */
1880 scc->kiss.mintime = 3; /* 3 s */
1881 scc->kiss.idletime = 30; /* 30 s */
1882 scc->kiss.maxdefer = 120; /* 2 min */
1883 scc->kiss.softdcd = 0; /* hardware dcd */
1884 }
1885
1886 scc->tx_buff = NULL;
1887 skb_queue_head_init(&scc->tx_queue);
1888 scc->init = 1;
1889
1890 return 0;
1891 }
1892
1893 return -EINVAL;
1894 }
1895
1896 switch(cmd)
1897 {
1898 case SIOCSCCRESERVED:
1899 return -ENOIOCTLCMD;
1900
1901 case SIOCSCCSMEM:
1902 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1903 if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1904 return -EINVAL;
1905 scc->stat.bufsize = memcfg.bufsize;
1906 return 0;
1907
1908 case SIOCSCCGSTAT:
1909 if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1910 return -EINVAL;
1911 return 0;
1912
1913 case SIOCSCCGKISS:
1914 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1915 return -EINVAL;
1916 kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1917 if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1918 return -EINVAL;
1919 return 0;
1920
1921 case SIOCSCCSKISS:
1922 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1923 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1924 return -EINVAL;
1925 return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1926
1927 case SIOCSCCCAL:
1928 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1929 if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1930 return -EINVAL;
1931
1932 scc_start_calibrate(scc, cal.time, cal.pattern);
1933 return 0;
1934
1935 default:
1936 return -ENOIOCTLCMD;
1937
1938 }
1939
1940 return -EINVAL;
1941 }
1942
1943 /* ----> set interface callsign <---- */
1944
1945 static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1946 {
1947 struct sockaddr *sa = (struct sockaddr *) addr;
1948 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1949 return 0;
1950 }
1951
1952 /* ----> get statistics <---- */
1953
1954 static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1955 {
1956 struct scc_channel *scc = (struct scc_channel *) dev->ml_priv;
1957
1958 scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1959 scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1960 scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1961 scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1962
1963 return &scc->dev_stat;
1964 }
1965
1966 /* ******************************************************************** */
1967 /* * dump statistics to /proc/net/z8530drv * */
1968 /* ******************************************************************** */
1969
1970 #ifdef CONFIG_PROC_FS
1971
1972 static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1973 {
1974 int k;
1975
1976 for (k = 0; k < Nchips*2; ++k) {
1977 if (!SCC_Info[k].init)
1978 continue;
1979 if (pos-- == 0)
1980 return &SCC_Info[k];
1981 }
1982 return NULL;
1983 }
1984
1985 static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1986 {
1987 return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1988
1989 }
1990
1991 static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1992 {
1993 unsigned k;
1994 struct scc_channel *scc = v;
1995 ++*pos;
1996
1997 for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
1998 k < Nchips*2; ++k) {
1999 if (SCC_Info[k].init)
2000 return &SCC_Info[k];
2001 }
2002 return NULL;
2003 }
2004
2005 static void scc_net_seq_stop(struct seq_file *seq, void *v)
2006 {
2007 }
2008
2009 static int scc_net_seq_show(struct seq_file *seq, void *v)
2010 {
2011 if (v == SEQ_START_TOKEN) {
2012 seq_puts(seq, "z8530drv-"VERSION"\n");
2013 } else if (!Driver_Initialized) {
2014 seq_puts(seq, "not initialized\n");
2015 } else if (!Nchips) {
2016 seq_puts(seq, "chips missing\n");
2017 } else {
2018 const struct scc_channel *scc = v;
2019 const struct scc_stat *stat = &scc->stat;
2020 const struct scc_kiss *kiss = &scc->kiss;
2021
2022
2023 /* dev data ctrl irq clock brand enh vector special option
2024 * baud nrz clocksrc softdcd bufsize
2025 * rxints txints exints spints
2026 * rcvd rxerrs over / xmit txerrs under / nospace bufsize
2027 * txd pers slot tail ful wait min maxk idl defr txof grp
2028 * W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2029 * R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2030 */
2031
2032 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2033 scc->dev->name,
2034 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2035 scc->enhanced, Vector_Latch, scc->special,
2036 scc->option);
2037 seq_printf(seq, "\t%lu %d %d %d %d\n",
2038 scc->modem.speed, scc->modem.nrz,
2039 scc->modem.clocksrc, kiss->softdcd,
2040 stat->bufsize);
2041 seq_printf(seq, "\t%lu %lu %lu %lu\n",
2042 stat->rxints, stat->txints, stat->exints, stat->spints);
2043 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2044 stat->rxframes, stat->rxerrs, stat->rx_over,
2045 stat->txframes, stat->txerrs, stat->tx_under,
2046 stat->nospace, stat->tx_state);
2047
2048 #define K(x) kiss->x
2049 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2050 K(txdelay), K(persist), K(slottime), K(tailtime),
2051 K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2052 K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2053 #undef K
2054 #ifdef SCC_DEBUG
2055 {
2056 int reg;
2057
2058 seq_printf(seq, "\tW ");
2059 for (reg = 0; reg < 16; reg++)
2060 seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2061 seq_printf(seq, "\n");
2062
2063 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2064 for (reg = 3; reg < 8; reg++)
2065 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2066 seq_printf(seq, "XX ");
2067 for (reg = 9; reg < 16; reg++)
2068 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2069 seq_printf(seq, "\n");
2070 }
2071 #endif
2072 seq_putc(seq, '\n');
2073 }
2074
2075 return 0;
2076 }
2077
2078 static const struct seq_operations scc_net_seq_ops = {
2079 .start = scc_net_seq_start,
2080 .next = scc_net_seq_next,
2081 .stop = scc_net_seq_stop,
2082 .show = scc_net_seq_show,
2083 };
2084
2085
2086 static int scc_net_seq_open(struct inode *inode, struct file *file)
2087 {
2088 return seq_open(file, &scc_net_seq_ops);
2089 }
2090
2091 static const struct file_operations scc_net_seq_fops = {
2092 .owner = THIS_MODULE,
2093 .open = scc_net_seq_open,
2094 .read = seq_read,
2095 .llseek = seq_lseek,
2096 .release = seq_release_private,
2097 };
2098
2099 #endif /* CONFIG_PROC_FS */
2100
2101
2102 /* ******************************************************************** */
2103 /* * Init SCC driver * */
2104 /* ******************************************************************** */
2105
2106 static int __init scc_init_driver (void)
2107 {
2108 char devname[IFNAMSIZ];
2109
2110 printk(banner);
2111
2112 sprintf(devname,"%s0", SCC_DriverName);
2113
2114 rtnl_lock();
2115 if (scc_net_alloc(devname, SCC_Info)) {
2116 rtnl_unlock();
2117 printk(KERN_ERR "z8530drv: cannot initialize module\n");
2118 return -EIO;
2119 }
2120 rtnl_unlock();
2121
2122 proc_net_fops_create(&init_net, "z8530drv", 0, &scc_net_seq_fops);
2123
2124 return 0;
2125 }
2126
2127 static void __exit scc_cleanup_driver(void)
2128 {
2129 io_port ctrl;
2130 int k;
2131 struct scc_channel *scc;
2132 struct net_device *dev;
2133
2134 if (Nchips == 0 && (dev = SCC_Info[0].dev))
2135 {
2136 unregister_netdev(dev);
2137 free_netdev(dev);
2138 }
2139
2140 /* Guard against chip prattle */
2141 local_irq_disable();
2142
2143 for (k = 0; k < Nchips; k++)
2144 if ( (ctrl = SCC_ctrl[k].chan_A) )
2145 {
2146 Outb(ctrl, 0);
2147 OutReg(ctrl,R9,FHWRES); /* force hardware reset */
2148 udelay(50);
2149 }
2150
2151 /* To unload the port must be closed so no real IRQ pending */
2152 for (k = 0; k < nr_irqs ; k++)
2153 if (Ivec[k].used) free_irq(k, NULL);
2154
2155 local_irq_enable();
2156
2157 /* Now clean up */
2158 for (k = 0; k < Nchips*2; k++)
2159 {
2160 scc = &SCC_Info[k];
2161 if (scc->ctrl)
2162 {
2163 release_region(scc->ctrl, 1);
2164 release_region(scc->data, 1);
2165 }
2166 if (scc->dev)
2167 {
2168 unregister_netdev(scc->dev);
2169 free_netdev(scc->dev);
2170 }
2171 }
2172
2173
2174 if (Vector_Latch)
2175 release_region(Vector_Latch, 1);
2176
2177 proc_net_remove(&init_net, "z8530drv");
2178 }
2179
2180 MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2181 MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2182 MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2183 MODULE_LICENSE("GPL");
2184 module_init(scc_init_driver);
2185 module_exit(scc_cleanup_driver);