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ISAPNP: remove unused pnp_dev->regs field
[linux-2.6/mini2440.git] / drivers / net / hamradio / scc.c
blobf90515935833a8cb25f8dc82b3a67540cb7008af
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/slab.h>
162 #include <linux/delay.h>
163 #include <linux/skbuff.h>
164 #include <linux/netdevice.h>
165 #include <linux/rtnetlink.h>
166 #include <linux/if_ether.h>
167 #include <linux/if_arp.h>
168 #include <linux/socket.h>
169 #include <linux/init.h>
170 #include <linux/scc.h>
171 #include <linux/ctype.h>
172 #include <linux/kernel.h>
173 #include <linux/proc_fs.h>
174 #include <linux/seq_file.h>
175 #include <linux/bitops.h>
176
177 #include <net/net_namespace.h>
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 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 int scc_net_tx(struct sk_buff *skb, struct net_device *dev);
212 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
213 static int scc_net_set_mac_address(struct net_device *dev, void *addr);
214 static struct net_device_stats * scc_net_get_stats(struct net_device *dev);
215
216 static unsigned char SCC_DriverName[] = "scc";
217
218 static struct irqflags { unsigned char used : 1; } Ivec[NR_IRQS];
219
220 static struct scc_channel SCC_Info[2 * SCC_MAXCHIPS]; /* information per channel */
221
222 static struct scc_ctrl {
223 io_port chan_A;
224 io_port chan_B;
225 int irq;
226 } SCC_ctrl[SCC_MAXCHIPS+1];
227
228 static unsigned char Driver_Initialized;
229 static int Nchips;
230 static io_port Vector_Latch;
231
232
233 /* ******************************************************************** */
234 /* * Port Access Functions * */
235 /* ******************************************************************** */
236
237 /* These provide interrupt save 2-step access to the Z8530 registers */
238
239 static DEFINE_SPINLOCK(iolock); /* Guards paired accesses */
240
241 static inline unsigned char InReg(io_port port, unsigned char reg)
242 {
243 unsigned long flags;
244 unsigned char r;
245
246 spin_lock_irqsave(&iolock, flags);
247 #ifdef SCC_LDELAY
248 Outb(port, reg);
249 udelay(SCC_LDELAY);
250 r=Inb(port);
251 udelay(SCC_LDELAY);
252 #else
253 Outb(port, reg);
254 r=Inb(port);
255 #endif
256 spin_unlock_irqrestore(&iolock, flags);
257 return r;
258 }
259
260 static inline void OutReg(io_port port, unsigned char reg, unsigned char val)
261 {
262 unsigned long flags;
263
264 spin_lock_irqsave(&iolock, flags);
265 #ifdef SCC_LDELAY
266 Outb(port, reg); udelay(SCC_LDELAY);
267 Outb(port, val); udelay(SCC_LDELAY);
268 #else
269 Outb(port, reg);
270 Outb(port, val);
271 #endif
272 spin_unlock_irqrestore(&iolock, flags);
273 }
274
275 static inline void wr(struct scc_channel *scc, unsigned char reg,
276 unsigned char val)
277 {
278 OutReg(scc->ctrl, reg, (scc->wreg[reg] = val));
279 }
280
281 static inline void or(struct scc_channel *scc, unsigned char reg, unsigned char val)
282 {
283 OutReg(scc->ctrl, reg, (scc->wreg[reg] |= val));
284 }
285
286 static inline void cl(struct scc_channel *scc, unsigned char reg, unsigned char val)
287 {
288 OutReg(scc->ctrl, reg, (scc->wreg[reg] &= ~val));
289 }
290
291 /* ******************************************************************** */
292 /* * Some useful macros * */
293 /* ******************************************************************** */
294
295 static inline void scc_discard_buffers(struct scc_channel *scc)
296 {
297 unsigned long flags;
298
299 spin_lock_irqsave(&scc->lock, flags);
300 if (scc->tx_buff != NULL)
301 {
302 dev_kfree_skb(scc->tx_buff);
303 scc->tx_buff = NULL;
304 }
305
306 while (!skb_queue_empty(&scc->tx_queue))
307 dev_kfree_skb(skb_dequeue(&scc->tx_queue));
308
309 spin_unlock_irqrestore(&scc->lock, flags);
310 }
311
312
313
314 /* ******************************************************************** */
315 /* * Interrupt Service Routines * */
316 /* ******************************************************************** */
317
318
319 /* ----> subroutines for the interrupt handlers <---- */
320
321 static inline void scc_notify(struct scc_channel *scc, int event)
322 {
323 struct sk_buff *skb;
324 char *bp;
325
326 if (scc->kiss.fulldup != KISS_DUPLEX_OPTIMA)
327 return;
328
329 skb = dev_alloc_skb(2);
330 if (skb != NULL)
331 {
332 bp = skb_put(skb, 2);
333 *bp++ = PARAM_HWEVENT;
334 *bp++ = event;
335 scc_net_rx(scc, skb);
336 } else
337 scc->stat.nospace++;
338 }
339
340 static inline void flush_rx_FIFO(struct scc_channel *scc)
341 {
342 int k;
343
344 for (k=0; k<3; k++)
345 Inb(scc->data);
346
347 if(scc->rx_buff != NULL) /* did we receive something? */
348 {
349 scc->stat.rxerrs++; /* then count it as an error */
350 dev_kfree_skb_irq(scc->rx_buff);
351 scc->rx_buff = NULL;
352 }
353 }
354
355 static void start_hunt(struct scc_channel *scc)
356 {
357 if ((scc->modem.clocksrc != CLK_EXTERNAL))
358 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
359 or(scc,R3,ENT_HM|RxENABLE); /* enable the receiver, hunt mode */
360 }
361
362 /* ----> four different interrupt handlers for Tx, Rx, changing of */
363 /* DCD/CTS and Rx/Tx errors */
364
365 /* Transmitter interrupt handler */
366 static inline void scc_txint(struct scc_channel *scc)
367 {
368 struct sk_buff *skb;
369
370 scc->stat.txints++;
371 skb = scc->tx_buff;
372
373 /* send first octet */
374
375 if (skb == NULL)
376 {
377 skb = skb_dequeue(&scc->tx_queue);
378 scc->tx_buff = skb;
379 netif_wake_queue(scc->dev);
380
381 if (skb == NULL)
382 {
383 scc_tx_done(scc);
384 Outb(scc->ctrl, RES_Tx_P);
385 return;
386 }
387
388 if (skb->len == 0) /* Paranoia... */
389 {
390 dev_kfree_skb_irq(skb);
391 scc->tx_buff = NULL;
392 scc_tx_done(scc);
393 Outb(scc->ctrl, RES_Tx_P);
394 return;
395 }
396
397 scc->stat.tx_state = TXS_ACTIVE;
398
399 OutReg(scc->ctrl, R0, RES_Tx_CRC);
400 /* reset CRC generator */
401 or(scc,R10,ABUNDER); /* re-install underrun protection */
402 Outb(scc->data,*skb->data); /* send byte */
403 skb_pull(skb, 1);
404
405 if (!scc->enhanced) /* reset EOM latch */
406 Outb(scc->ctrl,RES_EOM_L);
407 return;
408 }
409
410 /* End Of Frame... */
411
412 if (skb->len == 0)
413 {
414 Outb(scc->ctrl, RES_Tx_P); /* reset pending int */
415 cl(scc, R10, ABUNDER); /* send CRC */
416 dev_kfree_skb_irq(skb);
417 scc->tx_buff = NULL;
418 scc->stat.tx_state = TXS_NEWFRAME; /* next frame... */
419 return;
420 }
421
422 /* send octet */
423
424 Outb(scc->data,*skb->data);
425 skb_pull(skb, 1);
426 }
427
428
429 /* External/Status interrupt handler */
430 static inline void scc_exint(struct scc_channel *scc)
431 {
432 unsigned char status,changes,chg_and_stat;
433
434 scc->stat.exints++;
435
436 status = InReg(scc->ctrl,R0);
437 changes = status ^ scc->status;
438 chg_and_stat = changes & status;
439
440 /* ABORT: generated whenever DCD drops while receiving */
441
442 if (chg_and_stat & BRK_ABRT) /* Received an ABORT */
443 flush_rx_FIFO(scc);
444
445 /* HUNT: software DCD; on = waiting for SYNC, off = receiving frame */
446
447 if ((changes & SYNC_HUNT) && scc->kiss.softdcd)
448 {
449 if (status & SYNC_HUNT)
450 {
451 scc->dcd = 0;
452 flush_rx_FIFO(scc);
453 if ((scc->modem.clocksrc != CLK_EXTERNAL))
454 OutReg(scc->ctrl,R14,SEARCH|scc->wreg[R14]); /* DPLL: enter search mode */
455 } else {
456 scc->dcd = 1;
457 }
458
459 scc_notify(scc, scc->dcd? HWEV_DCD_OFF:HWEV_DCD_ON);
460 }
461
462 /* DCD: on = start to receive packet, off = ABORT condition */
463 /* (a successfully received packet generates a special condition int) */
464
465 if((changes & DCD) && !scc->kiss.softdcd) /* DCD input changed state */
466 {
467 if(status & DCD) /* DCD is now ON */
468 {
469 start_hunt(scc);
470 scc->dcd = 1;
471 } else { /* DCD is now OFF */
472 cl(scc,R3,ENT_HM|RxENABLE); /* disable the receiver */
473 flush_rx_FIFO(scc);
474 scc->dcd = 0;
475 }
476
477 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
478 }
479
480 #ifdef notdef
481 /* CTS: use external TxDelay (what's that good for?!)
482 * Anyway: If we _could_ use it (BayCom USCC uses CTS for
483 * own purposes) we _should_ use the "autoenable" feature
484 * of the Z8530 and not this interrupt...
485 */
486
487 if (chg_and_stat & CTS) /* CTS is now ON */
488 {
489 if (scc->kiss.txdelay == 0) /* zero TXDELAY = wait for CTS */
490 scc_start_tx_timer(scc, t_txdelay, 0);
491 }
492 #endif
493
494 if (scc->stat.tx_state == TXS_ACTIVE && (status & TxEOM))
495 {
496 scc->stat.tx_under++; /* oops, an underrun! count 'em */
497 Outb(scc->ctrl, RES_EXT_INT); /* reset ext/status interrupts */
498
499 if (scc->tx_buff != NULL)
500 {
501 dev_kfree_skb_irq(scc->tx_buff);
502 scc->tx_buff = NULL;
503 }
504
505 or(scc,R10,ABUNDER);
506 scc_start_tx_timer(scc, t_txdelay, 0); /* restart transmission */
507 }
508
509 scc->status = status;
510 Outb(scc->ctrl,RES_EXT_INT);
511 }
512
513
514 /* Receiver interrupt handler */
515 static inline void scc_rxint(struct scc_channel *scc)
516 {
517 struct sk_buff *skb;
518
519 scc->stat.rxints++;
520
521 if((scc->wreg[5] & RTS) && scc->kiss.fulldup == KISS_DUPLEX_HALF)
522 {
523 Inb(scc->data); /* discard char */
524 or(scc,R3,ENT_HM); /* enter hunt mode for next flag */
525 return;
526 }
527
528 skb = scc->rx_buff;
529
530 if (skb == NULL)
531 {
532 skb = dev_alloc_skb(scc->stat.bufsize);
533 if (skb == NULL)
534 {
535 scc->dev_stat.rx_dropped++;
536 scc->stat.nospace++;
537 Inb(scc->data);
538 or(scc, R3, ENT_HM);
539 return;
540 }
541
542 scc->rx_buff = skb;
543 *(skb_put(skb, 1)) = 0; /* KISS data */
544 }
545
546 if (skb->len >= scc->stat.bufsize)
547 {
548 #ifdef notdef
549 printk(KERN_DEBUG "z8530drv: oops, scc_rxint() received huge frame...\n");
550 #endif
551 dev_kfree_skb_irq(skb);
552 scc->rx_buff = NULL;
553 Inb(scc->data);
554 or(scc, R3, ENT_HM);
555 return;
556 }
557
558 *(skb_put(skb, 1)) = Inb(scc->data);
559 }
560
561
562 /* Receive Special Condition interrupt handler */
563 static inline void scc_spint(struct scc_channel *scc)
564 {
565 unsigned char status;
566 struct sk_buff *skb;
567
568 scc->stat.spints++;
569
570 status = InReg(scc->ctrl,R1); /* read receiver status */
571
572 Inb(scc->data); /* throw away Rx byte */
573 skb = scc->rx_buff;
574
575 if(status & Rx_OVR) /* receiver overrun */
576 {
577 scc->stat.rx_over++; /* count them */
578 or(scc,R3,ENT_HM); /* enter hunt mode for next flag */
579
580 if (skb != NULL)
581 dev_kfree_skb_irq(skb);
582 scc->rx_buff = skb = NULL;
583 }
584
585 if(status & END_FR && skb != NULL) /* end of frame */
586 {
587 /* CRC okay, frame ends on 8 bit boundary and received something ? */
588
589 if (!(status & CRC_ERR) && (status & 0xe) == RES8 && skb->len > 0)
590 {
591 /* ignore last received byte (first of the CRC bytes) */
592 skb_trim(skb, skb->len-1);
593 scc_net_rx(scc, skb);
594 scc->rx_buff = NULL;
595 scc->stat.rxframes++;
596 } else { /* a bad frame */
597 dev_kfree_skb_irq(skb);
598 scc->rx_buff = NULL;
599 scc->stat.rxerrs++;
600 }
601 }
602
603 Outb(scc->ctrl,ERR_RES);
604 }
605
606
607 /* ----> interrupt service routine for the Z8530 <---- */
608
609 static void scc_isr_dispatch(struct scc_channel *scc, int vector)
610 {
611 spin_lock(&scc->lock);
612 switch (vector & VECTOR_MASK)
613 {
614 case TXINT: scc_txint(scc); break;
615 case EXINT: scc_exint(scc); break;
616 case RXINT: scc_rxint(scc); break;
617 case SPINT: scc_spint(scc); break;
618 }
619 spin_unlock(&scc->lock);
620 }
621
622 /* If the card has a latch for the interrupt vector (like the PA0HZP card)
623 use it to get the number of the chip that generated the int.
624 If not: poll all defined chips.
625 */
626
627 #define SCC_IRQTIMEOUT 30000
628
629 static irqreturn_t scc_isr(int irq, void *dev_id)
630 {
631 int chip_irq = (long) dev_id;
632 unsigned char vector;
633 struct scc_channel *scc;
634 struct scc_ctrl *ctrl;
635 int k;
636
637 if (Vector_Latch)
638 {
639 for(k=0; k < SCC_IRQTIMEOUT; k++)
640 {
641 Outb(Vector_Latch, 0); /* Generate INTACK */
642
643 /* Read the vector */
644 if((vector=Inb(Vector_Latch)) >= 16 * Nchips) break;
645 if (vector & 0x01) break;
646
647 scc=&SCC_Info[vector >> 3 ^ 0x01];
648 if (!scc->dev) break;
649
650 scc_isr_dispatch(scc, vector);
651
652 OutReg(scc->ctrl,R0,RES_H_IUS); /* Reset Highest IUS */
653 }
654
655 if (k == SCC_IRQTIMEOUT)
656 printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?\n");
657
658 return IRQ_HANDLED;
659 }
660
661 /* Find the SCC generating the interrupt by polling all attached SCCs
662 * reading RR3A (the interrupt pending register)
663 */
664
665 ctrl = SCC_ctrl;
666 while (ctrl->chan_A)
667 {
668 if (ctrl->irq != chip_irq)
669 {
670 ctrl++;
671 continue;
672 }
673
674 scc = NULL;
675 for (k = 0; InReg(ctrl->chan_A,R3) && k < SCC_IRQTIMEOUT; k++)
676 {
677 vector=InReg(ctrl->chan_B,R2); /* Read the vector */
678 if (vector & 0x01) break;
679
680 scc = &SCC_Info[vector >> 3 ^ 0x01];
681 if (!scc->dev) break;
682
683 scc_isr_dispatch(scc, vector);
684 }
685
686 if (k == SCC_IRQTIMEOUT)
687 {
688 printk(KERN_WARNING "z8530drv: endless loop in scc_isr()?!\n");
689 break;
690 }
691
692 /* This looks weird and it is. At least the BayCom USCC doesn't
693 * use the Interrupt Daisy Chain, thus we'll have to start
694 * all over again to be sure not to miss an interrupt from
695 * (any of) the other chip(s)...
696 * Honestly, the situation *is* braindamaged...
697 */
698
699 if (scc != NULL)
700 {
701 OutReg(scc->ctrl,R0,RES_H_IUS);
702 ctrl = SCC_ctrl;
703 } else
704 ctrl++;
705 }
706 return IRQ_HANDLED;
707 }
708
709
710
711 /* ******************************************************************** */
712 /* * Init Channel */
713 /* ******************************************************************** */
714
715
716 /* ----> set SCC channel speed <---- */
717
718 static inline void set_brg(struct scc_channel *scc, unsigned int tc)
719 {
720 cl(scc,R14,BRENABL); /* disable baudrate generator */
721 wr(scc,R12,tc & 255); /* brg rate LOW */
722 wr(scc,R13,tc >> 8); /* brg rate HIGH */
723 or(scc,R14,BRENABL); /* enable baudrate generator */
724 }
725
726 static inline void set_speed(struct scc_channel *scc)
727 {
728 unsigned long flags;
729 spin_lock_irqsave(&scc->lock, flags);
730
731 if (scc->modem.speed > 0) /* paranoia... */
732 set_brg(scc, (unsigned) (scc->clock / (scc->modem.speed * 64)) - 2);
733
734 spin_unlock_irqrestore(&scc->lock, flags);
735 }
736
737
738 /* ----> initialize a SCC channel <---- */
739
740 static inline void init_brg(struct scc_channel *scc)
741 {
742 wr(scc, R14, BRSRC); /* BRG source = PCLK */
743 OutReg(scc->ctrl, R14, SSBR|scc->wreg[R14]); /* DPLL source = BRG */
744 OutReg(scc->ctrl, R14, SNRZI|scc->wreg[R14]); /* DPLL NRZI mode */
745 }
746
747 /*
748 * Initialization according to the Z8530 manual (SGS-Thomson's version):
749 *
750 * 1. Modes and constants
751 *
752 * WR9 11000000 chip reset
753 * WR4 XXXXXXXX Tx/Rx control, async or sync mode
754 * WR1 0XX00X00 select W/REQ (optional)
755 * WR2 XXXXXXXX program interrupt vector
756 * WR3 XXXXXXX0 select Rx control
757 * WR5 XXXX0XXX select Tx control
758 * WR6 XXXXXXXX sync character
759 * WR7 XXXXXXXX sync character
760 * WR9 000X0XXX select interrupt control
761 * WR10 XXXXXXXX miscellaneous control (optional)
762 * WR11 XXXXXXXX clock control
763 * WR12 XXXXXXXX time constant lower byte (optional)
764 * WR13 XXXXXXXX time constant upper byte (optional)
765 * WR14 XXXXXXX0 miscellaneous control
766 * WR14 XXXSSSSS commands (optional)
767 *
768 * 2. Enables
769 *
770 * WR14 000SSSS1 baud rate enable
771 * WR3 SSSSSSS1 Rx enable
772 * WR5 SSSS1SSS Tx enable
773 * WR0 10000000 reset Tx CRG (optional)
774 * WR1 XSS00S00 DMA enable (optional)
775 *
776 * 3. Interrupt status
777 *
778 * WR15 XXXXXXXX enable external/status
779 * WR0 00010000 reset external status
780 * WR0 00010000 reset external status twice
781 * WR1 SSSXXSXX enable Rx, Tx and Ext/status
782 * WR9 000SXSSS enable master interrupt enable
783 *
784 * 1 = set to one, 0 = reset to zero
785 * X = user defined, S = same as previous init
786 *
787 *
788 * Note that the implementation differs in some points from above scheme.
789 *
790 */
791
792 static void init_channel(struct scc_channel *scc)
793 {
794 del_timer(&scc->tx_t);
795 del_timer(&scc->tx_wdog);
796
797 disable_irq(scc->irq);
798
799 wr(scc,R4,X1CLK|SDLC); /* *1 clock, SDLC mode */
800 wr(scc,R1,0); /* no W/REQ operation */
801 wr(scc,R3,Rx8|RxCRC_ENAB); /* RX 8 bits/char, CRC, disabled */
802 wr(scc,R5,Tx8|DTR|TxCRC_ENAB); /* TX 8 bits/char, disabled, DTR */
803 wr(scc,R6,0); /* SDLC address zero (not used) */
804 wr(scc,R7,FLAG); /* SDLC flag value */
805 wr(scc,R9,VIS); /* vector includes status */
806 wr(scc,R10,(scc->modem.nrz? NRZ : NRZI)|CRCPS|ABUNDER); /* abort on underrun, preset CRC generator, NRZ(I) */
807 wr(scc,R14, 0);
808
809
810 /* set clock sources:
811
812 CLK_DPLL: normal halfduplex operation
813
814 RxClk: use DPLL
815 TxClk: use DPLL
816 TRxC mode DPLL output
817
818 CLK_EXTERNAL: external clocking (G3RUH or DF9IC modem)
819
820 BayCom: others:
821
822 TxClk = pin RTxC TxClk = pin TRxC
823 RxClk = pin TRxC RxClk = pin RTxC
824
825
826 CLK_DIVIDER:
827 RxClk = use DPLL
828 TxClk = pin RTxC
829
830 BayCom: others:
831 pin TRxC = DPLL pin TRxC = BRG
832 (RxClk * 1) (RxClk * 32)
833 */
834
835
836 switch(scc->modem.clocksrc)
837 {
838 case CLK_DPLL:
839 wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
840 init_brg(scc);
841 break;
842
843 case CLK_DIVIDER:
844 wr(scc, R11, ((scc->brand & BAYCOM)? TRxCDP : TRxCBR) | RCDPLL|TCRTxCP|TRxCOI);
845 init_brg(scc);
846 break;
847
848 case CLK_EXTERNAL:
849 wr(scc, R11, (scc->brand & BAYCOM)? RCTRxCP|TCRTxCP : RCRTxCP|TCTRxCP);
850 OutReg(scc->ctrl, R14, DISDPLL);
851 break;
852
853 }
854
855 set_speed(scc); /* set baudrate */
856
857 if(scc->enhanced)
858 {
859 or(scc,R15,SHDLCE|FIFOE); /* enable FIFO, SDLC/HDLC Enhancements (From now R7 is R7') */
860 wr(scc,R7,AUTOEOM);
861 }
862
863 if(scc->kiss.softdcd || (InReg(scc->ctrl,R0) & DCD))
864 /* DCD is now ON */
865 {
866 start_hunt(scc);
867 }
868
869 /* enable ABORT, DCD & SYNC/HUNT interrupts */
870
871 wr(scc,R15, BRKIE|TxUIE|(scc->kiss.softdcd? SYNCIE:DCDIE));
872
873 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
874 Outb(scc->ctrl,RES_EXT_INT); /* must be done twice */
875
876 or(scc,R1,INT_ALL_Rx|TxINT_ENAB|EXT_INT_ENAB); /* enable interrupts */
877
878 scc->status = InReg(scc->ctrl,R0); /* read initial status */
879
880 or(scc,R9,MIE); /* master interrupt enable */
881
882 scc_init_timer(scc);
883
884 enable_irq(scc->irq);
885 }
886
887
888
889
890 /* ******************************************************************** */
891 /* * SCC timer functions * */
892 /* ******************************************************************** */
893
894
895 /* ----> scc_key_trx sets the time constant for the baudrate
896 generator and keys the transmitter <---- */
897
898 static void scc_key_trx(struct scc_channel *scc, char tx)
899 {
900 unsigned int time_const;
901
902 if (scc->brand & PRIMUS)
903 Outb(scc->ctrl + 4, scc->option | (tx? 0x80 : 0));
904
905 if (scc->modem.speed < 300)
906 scc->modem.speed = 1200;
907
908 time_const = (unsigned) (scc->clock / (scc->modem.speed * (tx? 2:64))) - 2;
909
910 disable_irq(scc->irq);
911
912 if (tx)
913 {
914 or(scc, R1, TxINT_ENAB); /* t_maxkeyup may have reset these */
915 or(scc, R15, TxUIE);
916 }
917
918 if (scc->modem.clocksrc == CLK_DPLL)
919 { /* force simplex operation */
920 if (tx)
921 {
922 #ifdef CONFIG_SCC_TRXECHO
923 cl(scc, R3, RxENABLE|ENT_HM); /* switch off receiver */
924 cl(scc, R15, DCDIE|SYNCIE); /* No DCD changes, please */
925 #endif
926 set_brg(scc, time_const); /* reprogram baudrate generator */
927
928 /* DPLL -> Rx clk, BRG -> Tx CLK, TRxC mode output, TRxC = BRG */
929 wr(scc, R11, RCDPLL|TCBR|TRxCOI|TRxCBR);
930
931 /* By popular demand: tx_inhibit */
932 if (scc->kiss.tx_inhibit)
933 {
934 or(scc,R5, TxENAB);
935 scc->wreg[R5] |= RTS;
936 } else {
937 or(scc,R5,RTS|TxENAB); /* set the RTS line and enable TX */
938 }
939 } else {
940 cl(scc,R5,RTS|TxENAB);
941
942 set_brg(scc, time_const); /* reprogram baudrate generator */
943
944 /* DPLL -> Rx clk, DPLL -> Tx CLK, TRxC mode output, TRxC = DPLL */
945 wr(scc, R11, RCDPLL|TCDPLL|TRxCOI|TRxCDP);
946
947 #ifndef CONFIG_SCC_TRXECHO
948 if (scc->kiss.softdcd)
949 #endif
950 {
951 or(scc,R15, scc->kiss.softdcd? SYNCIE:DCDIE);
952 start_hunt(scc);
953 }
954 }
955 } else {
956 if (tx)
957 {
958 #ifdef CONFIG_SCC_TRXECHO
959 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
960 {
961 cl(scc, R3, RxENABLE);
962 cl(scc, R15, DCDIE|SYNCIE);
963 }
964 #endif
965
966 if (scc->kiss.tx_inhibit)
967 {
968 or(scc,R5, TxENAB);
969 scc->wreg[R5] |= RTS;
970 } else {
971 or(scc,R5,RTS|TxENAB); /* enable tx */
972 }
973 } else {
974 cl(scc,R5,RTS|TxENAB); /* disable tx */
975
976 if ((scc->kiss.fulldup == KISS_DUPLEX_HALF) &&
977 #ifndef CONFIG_SCC_TRXECHO
978 scc->kiss.softdcd)
979 #else
980 1)
981 #endif
982 {
983 or(scc, R15, scc->kiss.softdcd? SYNCIE:DCDIE);
984 start_hunt(scc);
985 }
986 }
987 }
988
989 enable_irq(scc->irq);
990 }
991
992
993 /* ----> SCC timer interrupt handler and friends. <---- */
994
995 static void __scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
996 {
997 del_timer(&scc->tx_t);
998
999 if (when == 0)
1000 {
1001 handler((unsigned long) scc);
1002 } else
1003 if (when != TIMER_OFF)
1004 {
1005 scc->tx_t.data = (unsigned long) scc;
1006 scc->tx_t.function = handler;
1007 scc->tx_t.expires = jiffies + (when*HZ)/100;
1008 add_timer(&scc->tx_t);
1009 }
1010 }
1011
1012 static void scc_start_tx_timer(struct scc_channel *scc, void (*handler)(unsigned long), unsigned long when)
1013 {
1014 unsigned long flags;
1015
1016 spin_lock_irqsave(&scc->lock, flags);
1017 __scc_start_tx_timer(scc, handler, when);
1018 spin_unlock_irqrestore(&scc->lock, flags);
1019 }
1020
1021 static void scc_start_defer(struct scc_channel *scc)
1022 {
1023 unsigned long flags;
1024
1025 spin_lock_irqsave(&scc->lock, flags);
1026 del_timer(&scc->tx_wdog);
1027
1028 if (scc->kiss.maxdefer != 0 && scc->kiss.maxdefer != TIMER_OFF)
1029 {
1030 scc->tx_wdog.data = (unsigned long) scc;
1031 scc->tx_wdog.function = t_busy;
1032 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxdefer;
1033 add_timer(&scc->tx_wdog);
1034 }
1035 spin_unlock_irqrestore(&scc->lock, flags);
1036 }
1037
1038 static void scc_start_maxkeyup(struct scc_channel *scc)
1039 {
1040 unsigned long flags;
1041
1042 spin_lock_irqsave(&scc->lock, flags);
1043 del_timer(&scc->tx_wdog);
1044
1045 if (scc->kiss.maxkeyup != 0 && scc->kiss.maxkeyup != TIMER_OFF)
1046 {
1047 scc->tx_wdog.data = (unsigned long) scc;
1048 scc->tx_wdog.function = t_maxkeyup;
1049 scc->tx_wdog.expires = jiffies + HZ*scc->kiss.maxkeyup;
1050 add_timer(&scc->tx_wdog);
1051 }
1052 spin_unlock_irqrestore(&scc->lock, flags);
1053 }
1054
1055 /*
1056 * This is called from scc_txint() when there are no more frames to send.
1057 * Not exactly a timer function, but it is a close friend of the family...
1058 */
1059
1060 static void scc_tx_done(struct scc_channel *scc)
1061 {
1062 /*
1063 * trx remains keyed in fulldup mode 2 until t_idle expires.
1064 */
1065
1066 switch (scc->kiss.fulldup)
1067 {
1068 case KISS_DUPLEX_LINK:
1069 scc->stat.tx_state = TXS_IDLE2;
1070 if (scc->kiss.idletime != TIMER_OFF)
1071 scc_start_tx_timer(scc, t_idle, 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_empty(&scc->tx_queue)) { /* nothing to send */
1130 scc->stat.tx_state = TXS_IDLE;
1131 netif_wake_queue(scc->dev); /* t_maxkeyup locked it. */
1132 return;
1133 }
1134
1135 scc->stat.tx_state = TXS_BUSY;
1136 }
1137
1138 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1139 {
1140 Rand = Rand * 17 + 31;
1141
1142 if (scc->dcd || (scc->kiss.persist) < Rand || (scc->kiss.group && is_grouped(scc)) )
1143 {
1144 scc_start_defer(scc);
1145 scc_start_tx_timer(scc, t_dwait, scc->kiss.slottime);
1146 return ;
1147 }
1148 }
1149
1150 if ( !(scc->wreg[R5] & RTS) )
1151 {
1152 scc_key_trx(scc, TX_ON);
1153 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1154 } else {
1155 scc_start_tx_timer(scc, t_txdelay, 0);
1156 }
1157 }
1158
1159
1160 /* TXDELAY expired
1161 *
1162 * kick transmission by a fake scc_txint(scc), start 'maxkeyup' watchdog.
1163 */
1164
1165 static void t_txdelay(unsigned long channel)
1166 {
1167 struct scc_channel *scc = (struct scc_channel *) channel;
1168
1169 scc_start_maxkeyup(scc);
1170
1171 if (scc->tx_buff == NULL)
1172 {
1173 disable_irq(scc->irq);
1174 scc_txint(scc);
1175 enable_irq(scc->irq);
1176 }
1177 }
1178
1179
1180 /* TAILTIME expired
1181 *
1182 * switch off transmitter. If we were stopped by Maxkeyup restart
1183 * transmission after 'mintime' seconds
1184 */
1185
1186 static void t_tail(unsigned long channel)
1187 {
1188 struct scc_channel *scc = (struct scc_channel *) channel;
1189 unsigned long flags;
1190
1191 spin_lock_irqsave(&scc->lock, flags);
1192 del_timer(&scc->tx_wdog);
1193 scc_key_trx(scc, TX_OFF);
1194 spin_unlock_irqrestore(&scc->lock, flags);
1195
1196 if (scc->stat.tx_state == TXS_TIMEOUT) /* we had a timeout? */
1197 {
1198 scc->stat.tx_state = TXS_WAIT;
1199 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1200 return;
1201 }
1202
1203 scc->stat.tx_state = TXS_IDLE;
1204 netif_wake_queue(scc->dev);
1205 }
1206
1207
1208 /* BUSY timeout
1209 *
1210 * throw away send buffers if DCD remains active too long.
1211 */
1212
1213 static void t_busy(unsigned long channel)
1214 {
1215 struct scc_channel *scc = (struct scc_channel *) channel;
1216
1217 del_timer(&scc->tx_t);
1218 netif_stop_queue(scc->dev); /* don't pile on the wabbit! */
1219
1220 scc_discard_buffers(scc);
1221 scc->stat.txerrs++;
1222 scc->stat.tx_state = TXS_IDLE;
1223
1224 netif_wake_queue(scc->dev);
1225 }
1226
1227 /* MAXKEYUP timeout
1228 *
1229 * this is our watchdog.
1230 */
1231
1232 static void t_maxkeyup(unsigned long channel)
1233 {
1234 struct scc_channel *scc = (struct scc_channel *) channel;
1235 unsigned long flags;
1236
1237 spin_lock_irqsave(&scc->lock, flags);
1238 /*
1239 * let things settle down before we start to
1240 * accept new data.
1241 */
1242
1243 netif_stop_queue(scc->dev);
1244 scc_discard_buffers(scc);
1245
1246 del_timer(&scc->tx_t);
1247
1248 cl(scc, R1, TxINT_ENAB); /* force an ABORT, but don't */
1249 cl(scc, R15, TxUIE); /* count it. */
1250 OutReg(scc->ctrl, R0, RES_Tx_P);
1251
1252 spin_unlock_irqrestore(&scc->lock, flags);
1253
1254 scc->stat.txerrs++;
1255 scc->stat.tx_state = TXS_TIMEOUT;
1256 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1257 }
1258
1259 /* IDLE timeout
1260 *
1261 * in fulldup mode 2 it keys down the transmitter after 'idle' seconds
1262 * of inactivity. We will not restart transmission before 'mintime'
1263 * expires.
1264 */
1265
1266 static void t_idle(unsigned long channel)
1267 {
1268 struct scc_channel *scc = (struct scc_channel *) channel;
1269
1270 del_timer(&scc->tx_wdog);
1271
1272 scc_key_trx(scc, TX_OFF);
1273 if(scc->kiss.mintime)
1274 scc_start_tx_timer(scc, t_dwait, scc->kiss.mintime*100);
1275 scc->stat.tx_state = TXS_WAIT;
1276 }
1277
1278 static void scc_init_timer(struct scc_channel *scc)
1279 {
1280 unsigned long flags;
1281
1282 spin_lock_irqsave(&scc->lock, flags);
1283 scc->stat.tx_state = TXS_IDLE;
1284 spin_unlock_irqrestore(&scc->lock, flags);
1285 }
1286
1287
1288 /* ******************************************************************** */
1289 /* * Set/get L1 parameters * */
1290 /* ******************************************************************** */
1291
1292
1293 /*
1294 * this will set the "hardware" parameters through KISS commands or ioctl()
1295 */
1296
1297 #define CAST(x) (unsigned long)(x)
1298
1299 static unsigned int scc_set_param(struct scc_channel *scc, unsigned int cmd, unsigned int arg)
1300 {
1301 switch (cmd)
1302 {
1303 case PARAM_TXDELAY: scc->kiss.txdelay=arg; break;
1304 case PARAM_PERSIST: scc->kiss.persist=arg; break;
1305 case PARAM_SLOTTIME: scc->kiss.slottime=arg; break;
1306 case PARAM_TXTAIL: scc->kiss.tailtime=arg; break;
1307 case PARAM_FULLDUP: scc->kiss.fulldup=arg; break;
1308 case PARAM_DTR: break; /* does someone need this? */
1309 case PARAM_GROUP: scc->kiss.group=arg; break;
1310 case PARAM_IDLE: scc->kiss.idletime=arg; break;
1311 case PARAM_MIN: scc->kiss.mintime=arg; break;
1312 case PARAM_MAXKEY: scc->kiss.maxkeyup=arg; break;
1313 case PARAM_WAIT: scc->kiss.waittime=arg; break;
1314 case PARAM_MAXDEFER: scc->kiss.maxdefer=arg; break;
1315 case PARAM_TX: scc->kiss.tx_inhibit=arg; break;
1316
1317 case PARAM_SOFTDCD:
1318 scc->kiss.softdcd=arg;
1319 if (arg)
1320 {
1321 or(scc, R15, SYNCIE);
1322 cl(scc, R15, DCDIE);
1323 start_hunt(scc);
1324 } else {
1325 or(scc, R15, DCDIE);
1326 cl(scc, R15, SYNCIE);
1327 }
1328 break;
1329
1330 case PARAM_SPEED:
1331 if (arg < 256)
1332 scc->modem.speed=arg*100;
1333 else
1334 scc->modem.speed=arg;
1335
1336 if (scc->stat.tx_state == 0) /* only switch baudrate on rx... ;-) */
1337 set_speed(scc);
1338 break;
1339
1340 case PARAM_RTS:
1341 if ( !(scc->wreg[R5] & RTS) )
1342 {
1343 if (arg != TX_OFF)
1344 scc_key_trx(scc, TX_ON);
1345 scc_start_tx_timer(scc, t_txdelay, scc->kiss.txdelay);
1346 } else {
1347 if (arg == TX_OFF)
1348 {
1349 scc->stat.tx_state = TXS_BUSY;
1350 scc_start_tx_timer(scc, t_tail, scc->kiss.tailtime);
1351 }
1352 }
1353 break;
1354
1355 case PARAM_HWEVENT:
1356 scc_notify(scc, scc->dcd? HWEV_DCD_ON:HWEV_DCD_OFF);
1357 break;
1358
1359 default: return -EINVAL;
1360 }
1361
1362 return 0;
1363 }
1364
1365
1366
1367 static unsigned long scc_get_param(struct scc_channel *scc, unsigned int cmd)
1368 {
1369 switch (cmd)
1370 {
1371 case PARAM_TXDELAY: return CAST(scc->kiss.txdelay);
1372 case PARAM_PERSIST: return CAST(scc->kiss.persist);
1373 case PARAM_SLOTTIME: return CAST(scc->kiss.slottime);
1374 case PARAM_TXTAIL: return CAST(scc->kiss.tailtime);
1375 case PARAM_FULLDUP: return CAST(scc->kiss.fulldup);
1376 case PARAM_SOFTDCD: return CAST(scc->kiss.softdcd);
1377 case PARAM_DTR: return CAST((scc->wreg[R5] & DTR)? 1:0);
1378 case PARAM_RTS: return CAST((scc->wreg[R5] & RTS)? 1:0);
1379 case PARAM_SPEED: return CAST(scc->modem.speed);
1380 case PARAM_GROUP: return CAST(scc->kiss.group);
1381 case PARAM_IDLE: return CAST(scc->kiss.idletime);
1382 case PARAM_MIN: return CAST(scc->kiss.mintime);
1383 case PARAM_MAXKEY: return CAST(scc->kiss.maxkeyup);
1384 case PARAM_WAIT: return CAST(scc->kiss.waittime);
1385 case PARAM_MAXDEFER: return CAST(scc->kiss.maxdefer);
1386 case PARAM_TX: return CAST(scc->kiss.tx_inhibit);
1387 default: return NO_SUCH_PARAM;
1388 }
1389
1390 }
1391
1392 #undef CAST
1393
1394 /* ******************************************************************* */
1395 /* * Send calibration pattern * */
1396 /* ******************************************************************* */
1397
1398 static void scc_stop_calibrate(unsigned long channel)
1399 {
1400 struct scc_channel *scc = (struct scc_channel *) channel;
1401 unsigned long flags;
1402
1403 spin_lock_irqsave(&scc->lock, flags);
1404 del_timer(&scc->tx_wdog);
1405 scc_key_trx(scc, TX_OFF);
1406 wr(scc, R6, 0);
1407 wr(scc, R7, FLAG);
1408 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1409 Outb(scc->ctrl,RES_EXT_INT);
1410
1411 netif_wake_queue(scc->dev);
1412 spin_unlock_irqrestore(&scc->lock, flags);
1413 }
1414
1415
1416 static void
1417 scc_start_calibrate(struct scc_channel *scc, int duration, unsigned char pattern)
1418 {
1419 unsigned long flags;
1420
1421 spin_lock_irqsave(&scc->lock, flags);
1422 netif_stop_queue(scc->dev);
1423 scc_discard_buffers(scc);
1424
1425 del_timer(&scc->tx_wdog);
1426
1427 scc->tx_wdog.data = (unsigned long) scc;
1428 scc->tx_wdog.function = scc_stop_calibrate;
1429 scc->tx_wdog.expires = jiffies + HZ*duration;
1430 add_timer(&scc->tx_wdog);
1431
1432 /* This doesn't seem to work. Why not? */
1433 wr(scc, R6, 0);
1434 wr(scc, R7, pattern);
1435
1436 /*
1437 * Don't know if this works.
1438 * Damn, where is my Z8530 programming manual...?
1439 */
1440
1441 Outb(scc->ctrl,RES_EXT_INT); /* reset ext/status interrupts */
1442 Outb(scc->ctrl,RES_EXT_INT);
1443
1444 scc_key_trx(scc, TX_ON);
1445 spin_unlock_irqrestore(&scc->lock, flags);
1446 }
1447
1448 /* ******************************************************************* */
1449 /* * Init channel structures, special HW, etc... * */
1450 /* ******************************************************************* */
1451
1452 /*
1453 * Reset the Z8530s and setup special hardware
1454 */
1455
1456 static void z8530_init(void)
1457 {
1458 struct scc_channel *scc;
1459 int chip, k;
1460 unsigned long flags;
1461 char *flag;
1462
1463
1464 printk(KERN_INFO "Init Z8530 driver: %u channels, IRQ", Nchips*2);
1465
1466 flag=" ";
1467 for (k = 0; k < NR_IRQS; k++)
1468 if (Ivec[k].used)
1469 {
1470 printk("%s%d", flag, k);
1471 flag=",";
1472 }
1473 printk("\n");
1474
1475
1476 /* reset and pre-init all chips in the system */
1477 for (chip = 0; chip < Nchips; chip++)
1478 {
1479 scc=&SCC_Info[2*chip];
1480 if (!scc->ctrl) continue;
1481
1482 /* Special SCC cards */
1483
1484 if(scc->brand & EAGLE) /* this is an EAGLE card */
1485 Outb(scc->special,0x08); /* enable interrupt on the board */
1486
1487 if(scc->brand & (PC100 | PRIMUS)) /* this is a PC100/PRIMUS card */
1488 Outb(scc->special,scc->option); /* set the MODEM mode (0x22) */
1489
1490
1491 /* Reset and pre-init Z8530 */
1492
1493 spin_lock_irqsave(&scc->lock, flags);
1494
1495 Outb(scc->ctrl, 0);
1496 OutReg(scc->ctrl,R9,FHWRES); /* force hardware reset */
1497 udelay(100); /* give it 'a bit' more time than required */
1498 wr(scc, R2, chip*16); /* interrupt vector */
1499 wr(scc, R9, VIS); /* vector includes status */
1500 spin_unlock_irqrestore(&scc->lock, flags);
1501 }
1502
1503
1504 Driver_Initialized = 1;
1505 }
1506
1507 /*
1508 * Allocate device structure, err, instance, and register driver
1509 */
1510
1511 static int scc_net_alloc(const char *name, struct scc_channel *scc)
1512 {
1513 int err;
1514 struct net_device *dev;
1515
1516 dev = alloc_netdev(0, name, scc_net_setup);
1517 if (!dev)
1518 return -ENOMEM;
1519
1520 dev->priv = scc;
1521 scc->dev = dev;
1522 spin_lock_init(&scc->lock);
1523 init_timer(&scc->tx_t);
1524 init_timer(&scc->tx_wdog);
1525
1526 err = register_netdevice(dev);
1527 if (err) {
1528 printk(KERN_ERR "%s: can't register network device (%d)\n",
1529 name, err);
1530 free_netdev(dev);
1531 scc->dev = NULL;
1532 return err;
1533 }
1534
1535 return 0;
1536 }
1537
1538
1539
1540 /* ******************************************************************** */
1541 /* * Network driver methods * */
1542 /* ******************************************************************** */
1543
1544 /* ----> Initialize device <----- */
1545
1546 static void scc_net_setup(struct net_device *dev)
1547 {
1548 dev->tx_queue_len = 16; /* should be enough... */
1549
1550 dev->open = scc_net_open;
1551 dev->stop = scc_net_close;
1552
1553 dev->hard_start_xmit = scc_net_tx;
1554 dev->header_ops = &ax25_header_ops;
1555
1556 dev->set_mac_address = scc_net_set_mac_address;
1557 dev->get_stats = scc_net_get_stats;
1558 dev->do_ioctl = scc_net_ioctl;
1559 dev->tx_timeout = NULL;
1560
1561 memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
1562 memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
1563
1564 dev->flags = 0;
1565
1566 dev->type = ARPHRD_AX25;
1567 dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
1568 dev->mtu = AX25_DEF_PACLEN;
1569 dev->addr_len = AX25_ADDR_LEN;
1570
1571 }
1572
1573 /* ----> open network device <---- */
1574
1575 static int scc_net_open(struct net_device *dev)
1576 {
1577 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1578
1579 if (!scc->init)
1580 return -EINVAL;
1581
1582 scc->tx_buff = NULL;
1583 skb_queue_head_init(&scc->tx_queue);
1584
1585 init_channel(scc);
1586
1587 netif_start_queue(dev);
1588 return 0;
1589 }
1590
1591 /* ----> close network device <---- */
1592
1593 static int scc_net_close(struct net_device *dev)
1594 {
1595 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1596 unsigned long flags;
1597
1598 netif_stop_queue(dev);
1599
1600 spin_lock_irqsave(&scc->lock, flags);
1601 Outb(scc->ctrl,0); /* Make sure pointer is written */
1602 wr(scc,R1,0); /* disable interrupts */
1603 wr(scc,R3,0);
1604 spin_unlock_irqrestore(&scc->lock, flags);
1605
1606 del_timer_sync(&scc->tx_t);
1607 del_timer_sync(&scc->tx_wdog);
1608
1609 scc_discard_buffers(scc);
1610
1611 return 0;
1612 }
1613
1614 /* ----> receive frame, called from scc_rxint() <---- */
1615
1616 static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
1617 {
1618 if (skb->len == 0) {
1619 dev_kfree_skb_irq(skb);
1620 return;
1621 }
1622
1623 scc->dev_stat.rx_packets++;
1624 scc->dev_stat.rx_bytes += skb->len;
1625
1626 skb->protocol = ax25_type_trans(skb, scc->dev);
1627
1628 netif_rx(skb);
1629 scc->dev->last_rx = jiffies;
1630 return;
1631 }
1632
1633 /* ----> transmit frame <---- */
1634
1635 static int scc_net_tx(struct sk_buff *skb, struct net_device *dev)
1636 {
1637 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1638 unsigned long flags;
1639 char kisscmd;
1640
1641 if (skb->len > scc->stat.bufsize || skb->len < 2) {
1642 scc->dev_stat.tx_dropped++; /* bogus frame */
1643 dev_kfree_skb(skb);
1644 return 0;
1645 }
1646
1647 scc->dev_stat.tx_packets++;
1648 scc->dev_stat.tx_bytes += skb->len;
1649 scc->stat.txframes++;
1650
1651 kisscmd = *skb->data & 0x1f;
1652 skb_pull(skb, 1);
1653
1654 if (kisscmd) {
1655 scc_set_param(scc, kisscmd, *skb->data);
1656 dev_kfree_skb(skb);
1657 return 0;
1658 }
1659
1660 spin_lock_irqsave(&scc->lock, flags);
1661
1662 if (skb_queue_len(&scc->tx_queue) > scc->dev->tx_queue_len) {
1663 struct sk_buff *skb_del;
1664 skb_del = skb_dequeue(&scc->tx_queue);
1665 dev_kfree_skb(skb_del);
1666 }
1667 skb_queue_tail(&scc->tx_queue, skb);
1668 dev->trans_start = jiffies;
1669
1670
1671 /*
1672 * Start transmission if the trx state is idle or
1673 * t_idle hasn't expired yet. Use dwait/persistence/slottime
1674 * algorithm for normal halfduplex operation.
1675 */
1676
1677 if(scc->stat.tx_state == TXS_IDLE || scc->stat.tx_state == TXS_IDLE2) {
1678 scc->stat.tx_state = TXS_BUSY;
1679 if (scc->kiss.fulldup == KISS_DUPLEX_HALF)
1680 __scc_start_tx_timer(scc, t_dwait, scc->kiss.waittime);
1681 else
1682 __scc_start_tx_timer(scc, t_dwait, 0);
1683 }
1684 spin_unlock_irqrestore(&scc->lock, flags);
1685 return 0;
1686 }
1687
1688 /* ----> ioctl functions <---- */
1689
1690 /*
1691 * SIOCSCCCFG - configure driver arg: (struct scc_hw_config *) arg
1692 * SIOCSCCINI - initialize driver arg: ---
1693 * SIOCSCCCHANINI - initialize channel arg: (struct scc_modem *) arg
1694 * SIOCSCCSMEM - set memory arg: (struct scc_mem_config *) arg
1695 * SIOCSCCGKISS - get level 1 parameter arg: (struct scc_kiss_cmd *) arg
1696 * SIOCSCCSKISS - set level 1 parameter arg: (struct scc_kiss_cmd *) arg
1697 * SIOCSCCGSTAT - get driver status arg: (struct scc_stat *) arg
1698 * SIOCSCCCAL - send calib. pattern arg: (struct scc_calibrate *) arg
1699 */
1700
1701 static int scc_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1702 {
1703 struct scc_kiss_cmd kiss_cmd;
1704 struct scc_mem_config memcfg;
1705 struct scc_hw_config hwcfg;
1706 struct scc_calibrate cal;
1707 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1708 int chan;
1709 unsigned char device_name[IFNAMSIZ];
1710 void __user *arg = ifr->ifr_data;
1711
1712
1713 if (!Driver_Initialized)
1714 {
1715 if (cmd == SIOCSCCCFG)
1716 {
1717 int found = 1;
1718
1719 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1720 if (!arg) return -EFAULT;
1721
1722 if (Nchips >= SCC_MAXCHIPS)
1723 return -EINVAL;
1724
1725 if (copy_from_user(&hwcfg, arg, sizeof(hwcfg)))
1726 return -EFAULT;
1727
1728 if (hwcfg.irq == 2) hwcfg.irq = 9;
1729
1730 if (hwcfg.irq < 0 || hwcfg.irq >= NR_IRQS)
1731 return -EINVAL;
1732
1733 if (!Ivec[hwcfg.irq].used && hwcfg.irq)
1734 {
1735 if (request_irq(hwcfg.irq, scc_isr,
1736 IRQF_DISABLED, "AX.25 SCC",
1737 (void *)(long) hwcfg.irq))
1738 printk(KERN_WARNING "z8530drv: warning, cannot get IRQ %d\n", hwcfg.irq);
1739 else
1740 Ivec[hwcfg.irq].used = 1;
1741 }
1742
1743 if (hwcfg.vector_latch && !Vector_Latch) {
1744 if (!request_region(hwcfg.vector_latch, 1, "scc vector latch"))
1745 printk(KERN_WARNING "z8530drv: warning, cannot reserve vector latch port 0x%lx\n, disabled.", hwcfg.vector_latch);
1746 else
1747 Vector_Latch = hwcfg.vector_latch;
1748 }
1749
1750 if (hwcfg.clock == 0)
1751 hwcfg.clock = SCC_DEFAULT_CLOCK;
1752
1753 #ifndef SCC_DONT_CHECK
1754
1755 if(request_region(hwcfg.ctrl_a, 1, "scc-probe"))
1756 {
1757 disable_irq(hwcfg.irq);
1758 Outb(hwcfg.ctrl_a, 0);
1759 OutReg(hwcfg.ctrl_a, R9, FHWRES);
1760 udelay(100);
1761 OutReg(hwcfg.ctrl_a,R13,0x55); /* is this chip really there? */
1762 udelay(5);
1763
1764 if (InReg(hwcfg.ctrl_a,R13) != 0x55)
1765 found = 0;
1766 enable_irq(hwcfg.irq);
1767 release_region(hwcfg.ctrl_a, 1);
1768 }
1769 else
1770 found = 0;
1771 #endif
1772
1773 if (found)
1774 {
1775 SCC_Info[2*Nchips ].ctrl = hwcfg.ctrl_a;
1776 SCC_Info[2*Nchips ].data = hwcfg.data_a;
1777 SCC_Info[2*Nchips ].irq = hwcfg.irq;
1778 SCC_Info[2*Nchips+1].ctrl = hwcfg.ctrl_b;
1779 SCC_Info[2*Nchips+1].data = hwcfg.data_b;
1780 SCC_Info[2*Nchips+1].irq = hwcfg.irq;
1781
1782 SCC_ctrl[Nchips].chan_A = hwcfg.ctrl_a;
1783 SCC_ctrl[Nchips].chan_B = hwcfg.ctrl_b;
1784 SCC_ctrl[Nchips].irq = hwcfg.irq;
1785 }
1786
1787
1788 for (chan = 0; chan < 2; chan++)
1789 {
1790 sprintf(device_name, "%s%i", SCC_DriverName, 2*Nchips+chan);
1791
1792 SCC_Info[2*Nchips+chan].special = hwcfg.special;
1793 SCC_Info[2*Nchips+chan].clock = hwcfg.clock;
1794 SCC_Info[2*Nchips+chan].brand = hwcfg.brand;
1795 SCC_Info[2*Nchips+chan].option = hwcfg.option;
1796 SCC_Info[2*Nchips+chan].enhanced = hwcfg.escc;
1797
1798 #ifdef SCC_DONT_CHECK
1799 printk(KERN_INFO "%s: data port = 0x%3.3x control port = 0x%3.3x\n",
1800 device_name,
1801 SCC_Info[2*Nchips+chan].data,
1802 SCC_Info[2*Nchips+chan].ctrl);
1803
1804 #else
1805 printk(KERN_INFO "%s: data port = 0x%3.3lx control port = 0x%3.3lx -- %s\n",
1806 device_name,
1807 chan? hwcfg.data_b : hwcfg.data_a,
1808 chan? hwcfg.ctrl_b : hwcfg.ctrl_a,
1809 found? "found" : "missing");
1810 #endif
1811
1812 if (found)
1813 {
1814 request_region(SCC_Info[2*Nchips+chan].ctrl, 1, "scc ctrl");
1815 request_region(SCC_Info[2*Nchips+chan].data, 1, "scc data");
1816 if (Nchips+chan != 0 &&
1817 scc_net_alloc(device_name,
1818 &SCC_Info[2*Nchips+chan]))
1819 return -EINVAL;
1820 }
1821 }
1822
1823 if (found) Nchips++;
1824
1825 return 0;
1826 }
1827
1828 if (cmd == SIOCSCCINI)
1829 {
1830 if (!capable(CAP_SYS_RAWIO))
1831 return -EPERM;
1832
1833 if (Nchips == 0)
1834 return -EINVAL;
1835
1836 z8530_init();
1837 return 0;
1838 }
1839
1840 return -EINVAL; /* confuse the user */
1841 }
1842
1843 if (!scc->init)
1844 {
1845 if (cmd == SIOCSCCCHANINI)
1846 {
1847 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1848 if (!arg) return -EINVAL;
1849
1850 scc->stat.bufsize = SCC_BUFSIZE;
1851
1852 if (copy_from_user(&scc->modem, arg, sizeof(struct scc_modem)))
1853 return -EINVAL;
1854
1855 /* default KISS Params */
1856
1857 if (scc->modem.speed < 4800)
1858 {
1859 scc->kiss.txdelay = 36; /* 360 ms */
1860 scc->kiss.persist = 42; /* 25% persistence */ /* was 25 */
1861 scc->kiss.slottime = 16; /* 160 ms */
1862 scc->kiss.tailtime = 4; /* minimal reasonable value */
1863 scc->kiss.fulldup = 0; /* CSMA */
1864 scc->kiss.waittime = 50; /* 500 ms */
1865 scc->kiss.maxkeyup = 10; /* 10 s */
1866 scc->kiss.mintime = 3; /* 3 s */
1867 scc->kiss.idletime = 30; /* 30 s */
1868 scc->kiss.maxdefer = 120; /* 2 min */
1869 scc->kiss.softdcd = 0; /* hardware dcd */
1870 } else {
1871 scc->kiss.txdelay = 10; /* 100 ms */
1872 scc->kiss.persist = 64; /* 25% persistence */ /* was 25 */
1873 scc->kiss.slottime = 8; /* 160 ms */
1874 scc->kiss.tailtime = 1; /* minimal reasonable value */
1875 scc->kiss.fulldup = 0; /* CSMA */
1876 scc->kiss.waittime = 50; /* 500 ms */
1877 scc->kiss.maxkeyup = 7; /* 7 s */
1878 scc->kiss.mintime = 3; /* 3 s */
1879 scc->kiss.idletime = 30; /* 30 s */
1880 scc->kiss.maxdefer = 120; /* 2 min */
1881 scc->kiss.softdcd = 0; /* hardware dcd */
1882 }
1883
1884 scc->tx_buff = NULL;
1885 skb_queue_head_init(&scc->tx_queue);
1886 scc->init = 1;
1887
1888 return 0;
1889 }
1890
1891 return -EINVAL;
1892 }
1893
1894 switch(cmd)
1895 {
1896 case SIOCSCCRESERVED:
1897 return -ENOIOCTLCMD;
1898
1899 case SIOCSCCSMEM:
1900 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1901 if (!arg || copy_from_user(&memcfg, arg, sizeof(memcfg)))
1902 return -EINVAL;
1903 scc->stat.bufsize = memcfg.bufsize;
1904 return 0;
1905
1906 case SIOCSCCGSTAT:
1907 if (!arg || copy_to_user(arg, &scc->stat, sizeof(scc->stat)))
1908 return -EINVAL;
1909 return 0;
1910
1911 case SIOCSCCGKISS:
1912 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1913 return -EINVAL;
1914 kiss_cmd.param = scc_get_param(scc, kiss_cmd.command);
1915 if (copy_to_user(arg, &kiss_cmd, sizeof(kiss_cmd)))
1916 return -EINVAL;
1917 return 0;
1918
1919 case SIOCSCCSKISS:
1920 if (!capable(CAP_NET_ADMIN)) return -EPERM;
1921 if (!arg || copy_from_user(&kiss_cmd, arg, sizeof(kiss_cmd)))
1922 return -EINVAL;
1923 return scc_set_param(scc, kiss_cmd.command, kiss_cmd.param);
1924
1925 case SIOCSCCCAL:
1926 if (!capable(CAP_SYS_RAWIO)) return -EPERM;
1927 if (!arg || copy_from_user(&cal, arg, sizeof(cal)) || cal.time == 0)
1928 return -EINVAL;
1929
1930 scc_start_calibrate(scc, cal.time, cal.pattern);
1931 return 0;
1932
1933 default:
1934 return -ENOIOCTLCMD;
1935
1936 }
1937
1938 return -EINVAL;
1939 }
1940
1941 /* ----> set interface callsign <---- */
1942
1943 static int scc_net_set_mac_address(struct net_device *dev, void *addr)
1944 {
1945 struct sockaddr *sa = (struct sockaddr *) addr;
1946 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
1947 return 0;
1948 }
1949
1950 /* ----> get statistics <---- */
1951
1952 static struct net_device_stats *scc_net_get_stats(struct net_device *dev)
1953 {
1954 struct scc_channel *scc = (struct scc_channel *) dev->priv;
1955
1956 scc->dev_stat.rx_errors = scc->stat.rxerrs + scc->stat.rx_over;
1957 scc->dev_stat.tx_errors = scc->stat.txerrs + scc->stat.tx_under;
1958 scc->dev_stat.rx_fifo_errors = scc->stat.rx_over;
1959 scc->dev_stat.tx_fifo_errors = scc->stat.tx_under;
1960
1961 return &scc->dev_stat;
1962 }
1963
1964 /* ******************************************************************** */
1965 /* * dump statistics to /proc/net/z8530drv * */
1966 /* ******************************************************************** */
1967
1968 #ifdef CONFIG_PROC_FS
1969
1970 static inline struct scc_channel *scc_net_seq_idx(loff_t pos)
1971 {
1972 int k;
1973
1974 for (k = 0; k < Nchips*2; ++k) {
1975 if (!SCC_Info[k].init)
1976 continue;
1977 if (pos-- == 0)
1978 return &SCC_Info[k];
1979 }
1980 return NULL;
1981 }
1982
1983 static void *scc_net_seq_start(struct seq_file *seq, loff_t *pos)
1984 {
1985 return *pos ? scc_net_seq_idx(*pos - 1) : SEQ_START_TOKEN;
1986
1987 }
1988
1989 static void *scc_net_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1990 {
1991 unsigned k;
1992 struct scc_channel *scc = v;
1993 ++*pos;
1994
1995 for (k = (v == SEQ_START_TOKEN) ? 0 : (scc - SCC_Info)+1;
1996 k < Nchips*2; ++k) {
1997 if (SCC_Info[k].init)
1998 return &SCC_Info[k];
1999 }
2000 return NULL;
2001 }
2002
2003 static void scc_net_seq_stop(struct seq_file *seq, void *v)
2004 {
2005 }
2006
2007 static int scc_net_seq_show(struct seq_file *seq, void *v)
2008 {
2009 if (v == SEQ_START_TOKEN) {
2010 seq_puts(seq, "z8530drv-"VERSION"\n");
2011 } else if (!Driver_Initialized) {
2012 seq_puts(seq, "not initialized\n");
2013 } else if (!Nchips) {
2014 seq_puts(seq, "chips missing\n");
2015 } else {
2016 const struct scc_channel *scc = v;
2017 const struct scc_stat *stat = &scc->stat;
2018 const struct scc_kiss *kiss = &scc->kiss;
2019
2020
2021 /* dev data ctrl irq clock brand enh vector special option
2022 * baud nrz clocksrc softdcd bufsize
2023 * rxints txints exints spints
2024 * rcvd rxerrs over / xmit txerrs under / nospace bufsize
2025 * txd pers slot tail ful wait min maxk idl defr txof grp
2026 * W ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
2027 * R ## ## XX ## ## ## ## ## XX ## ## ## ## ## ## ##
2028 */
2029
2030 seq_printf(seq, "%s\t%3.3lx %3.3lx %d %lu %2.2x %d %3.3lx %3.3lx %d\n",
2031 scc->dev->name,
2032 scc->data, scc->ctrl, scc->irq, scc->clock, scc->brand,
2033 scc->enhanced, Vector_Latch, scc->special,
2034 scc->option);
2035 seq_printf(seq, "\t%lu %d %d %d %d\n",
2036 scc->modem.speed, scc->modem.nrz,
2037 scc->modem.clocksrc, kiss->softdcd,
2038 stat->bufsize);
2039 seq_printf(seq, "\t%lu %lu %lu %lu\n",
2040 stat->rxints, stat->txints, stat->exints, stat->spints);
2041 seq_printf(seq, "\t%lu %lu %d / %lu %lu %d / %d %d\n",
2042 stat->rxframes, stat->rxerrs, stat->rx_over,
2043 stat->txframes, stat->txerrs, stat->tx_under,
2044 stat->nospace, stat->tx_state);
2045
2046 #define K(x) kiss->x
2047 seq_printf(seq, "\t%d %d %d %d %d %d %d %d %d %d %d %d\n",
2048 K(txdelay), K(persist), K(slottime), K(tailtime),
2049 K(fulldup), K(waittime), K(mintime), K(maxkeyup),
2050 K(idletime), K(maxdefer), K(tx_inhibit), K(group));
2051 #undef K
2052 #ifdef SCC_DEBUG
2053 {
2054 int reg;
2055
2056 seq_printf(seq, "\tW ");
2057 for (reg = 0; reg < 16; reg++)
2058 seq_printf(seq, "%2.2x ", scc->wreg[reg]);
2059 seq_printf(seq, "\n");
2060
2061 seq_printf(seq, "\tR %2.2x %2.2x XX ", InReg(scc->ctrl,R0), InReg(scc->ctrl,R1));
2062 for (reg = 3; reg < 8; reg++)
2063 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2064 seq_printf(seq, "XX ");
2065 for (reg = 9; reg < 16; reg++)
2066 seq_printf(seq, "%2.2x ", InReg(scc->ctrl, reg));
2067 seq_printf(seq, "\n");
2068 }
2069 #endif
2070 seq_putc(seq, '\n');
2071 }
2072
2073 return 0;
2074 }
2075
2076 static struct seq_operations scc_net_seq_ops = {
2077 .start = scc_net_seq_start,
2078 .next = scc_net_seq_next,
2079 .stop = scc_net_seq_stop,
2080 .show = scc_net_seq_show,
2081 };
2082
2083
2084 static int scc_net_seq_open(struct inode *inode, struct file *file)
2085 {
2086 return seq_open(file, &scc_net_seq_ops);
2087 }
2088
2089 static const struct file_operations scc_net_seq_fops = {
2090 .owner = THIS_MODULE,
2091 .open = scc_net_seq_open,
2092 .read = seq_read,
2093 .llseek = seq_lseek,
2094 .release = seq_release_private,
2095 };
2096
2097 #endif /* CONFIG_PROC_FS */
2098
2099
2100 /* ******************************************************************** */
2101 /* * Init SCC driver * */
2102 /* ******************************************************************** */
2103
2104 static int __init scc_init_driver (void)
2105 {
2106 char devname[IFNAMSIZ];
2107
2108 printk(banner);
2109
2110 sprintf(devname,"%s0", SCC_DriverName);
2111
2112 rtnl_lock();
2113 if (scc_net_alloc(devname, SCC_Info)) {
2114 rtnl_unlock();
2115 printk(KERN_ERR "z8530drv: cannot initialize module\n");
2116 return -EIO;
2117 }
2118 rtnl_unlock();
2119
2120 proc_net_fops_create(&init_net, "z8530drv", 0, &scc_net_seq_fops);
2121
2122 return 0;
2123 }
2124
2125 static void __exit scc_cleanup_driver(void)
2126 {
2127 io_port ctrl;
2128 int k;
2129 struct scc_channel *scc;
2130 struct net_device *dev;
2131
2132 if (Nchips == 0 && (dev = SCC_Info[0].dev))
2133 {
2134 unregister_netdev(dev);
2135 free_netdev(dev);
2136 }
2137
2138 /* Guard against chip prattle */
2139 local_irq_disable();
2140
2141 for (k = 0; k < Nchips; k++)
2142 if ( (ctrl = SCC_ctrl[k].chan_A) )
2143 {
2144 Outb(ctrl, 0);
2145 OutReg(ctrl,R9,FHWRES); /* force hardware reset */
2146 udelay(50);
2147 }
2148
2149 /* To unload the port must be closed so no real IRQ pending */
2150 for (k=0; k < NR_IRQS ; k++)
2151 if (Ivec[k].used) free_irq(k, NULL);
2152
2153 local_irq_enable();
2154
2155 /* Now clean up */
2156 for (k = 0; k < Nchips*2; k++)
2157 {
2158 scc = &SCC_Info[k];
2159 if (scc->ctrl)
2160 {
2161 release_region(scc->ctrl, 1);
2162 release_region(scc->data, 1);
2163 }
2164 if (scc->dev)
2165 {
2166 unregister_netdev(scc->dev);
2167 free_netdev(scc->dev);
2168 }
2169 }
2170
2171
2172 if (Vector_Latch)
2173 release_region(Vector_Latch, 1);
2174
2175 proc_net_remove(&init_net, "z8530drv");
2176 }
2177
2178 MODULE_AUTHOR("Joerg Reuter <jreuter@yaina.de>");
2179 MODULE_DESCRIPTION("AX.25 Device Driver for Z8530 based HDLC cards");
2180 MODULE_SUPPORTED_DEVICE("Z8530 based SCC cards for Amateur Radio");
2181 MODULE_LICENSE("GPL");
2182 module_init(scc_init_driver);
2183 module_exit(scc_cleanup_driver);
Support for the Chinese Samsung S3C2440 based development boards