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[PATCH] g_file_storage: fix obscure race condition
[linux/fpc-iii.git] / drivers / isdn / hisax / ipacx.c
blobefba2f44801797f726f30c6033b14dfc3d65611a
1 /*
2 *
3 * IPACX specific routines
4 *
5 * Author Joerg Petersohn
6 * Derived from hisax_isac.c, isac.c, hscx.c and others
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 */
12 #include <linux/kernel.h>
13 #include <linux/config.h>
14 #include <linux/init.h>
15 #include "hisax_if.h"
16 #include "hisax.h"
17 #include "isdnl1.h"
18 #include "ipacx.h"
19
20 #define DBUSY_TIMER_VALUE 80
21 #define TIMER3_VALUE 7000
22 #define MAX_DFRAME_LEN_L1 300
23 #define B_FIFO_SIZE 64
24 #define D_FIFO_SIZE 32
25
26
27 // ipacx interrupt mask values
28 #define _MASK_IMASK 0x2E // global mask
29 #define _MASKB_IMASK 0x0B
30 #define _MASKD_IMASK 0x03 // all on
31
32 //----------------------------------------------------------
33 // local function declarations
34 //----------------------------------------------------------
35 static void ph_command(struct IsdnCardState *cs, unsigned int command);
36 static inline void cic_int(struct IsdnCardState *cs);
37 static void dch_l2l1(struct PStack *st, int pr, void *arg);
38 static void dbusy_timer_handler(struct IsdnCardState *cs);
39 static void dch_empty_fifo(struct IsdnCardState *cs, int count);
40 static void dch_fill_fifo(struct IsdnCardState *cs);
41 static inline void dch_int(struct IsdnCardState *cs);
42 static void __devinit dch_setstack(struct PStack *st, struct IsdnCardState *cs);
43 static void __devinit dch_init(struct IsdnCardState *cs);
44 static void bch_l2l1(struct PStack *st, int pr, void *arg);
45 static void bch_empty_fifo(struct BCState *bcs, int count);
46 static void bch_fill_fifo(struct BCState *bcs);
47 static void bch_int(struct IsdnCardState *cs, u_char hscx);
48 static void bch_mode(struct BCState *bcs, int mode, int bc);
49 static void bch_close_state(struct BCState *bcs);
50 static int bch_open_state(struct IsdnCardState *cs, struct BCState *bcs);
51 static int bch_setstack(struct PStack *st, struct BCState *bcs);
52 static void __devinit bch_init(struct IsdnCardState *cs, int hscx);
53 static void __init clear_pending_ints(struct IsdnCardState *cs);
54
55 //----------------------------------------------------------
56 // Issue Layer 1 command to chip
57 //----------------------------------------------------------
58 static void
59 ph_command(struct IsdnCardState *cs, unsigned int command)
60 {
61 if (cs->debug &L1_DEB_ISAC)
62 debugl1(cs, "ph_command (%#x) in (%#x)", command,
63 cs->dc.isac.ph_state);
64 //###################################
65 // printk(KERN_INFO "ph_command (%#x)\n", command);
66 //###################################
67 cs->writeisac(cs, IPACX_CIX0, (command << 4) | 0x0E);
68 }
69
70 //----------------------------------------------------------
71 // Transceiver interrupt handler
72 //----------------------------------------------------------
73 static inline void
74 cic_int(struct IsdnCardState *cs)
75 {
76 u_char event;
77
78 event = cs->readisac(cs, IPACX_CIR0) >> 4;
79 if (cs->debug &L1_DEB_ISAC) debugl1(cs, "cic_int(event=%#x)", event);
80 //#########################################
81 // printk(KERN_INFO "cic_int(%x)\n", event);
82 //#########################################
83 cs->dc.isac.ph_state = event;
84 schedule_event(cs, D_L1STATECHANGE);
85 }
86
87 //==========================================================
88 // D channel functions
89 //==========================================================
90
91 //----------------------------------------------------------
92 // Command entry point
93 //----------------------------------------------------------
94 static void
95 dch_l2l1(struct PStack *st, int pr, void *arg)
96 {
97 struct IsdnCardState *cs = (struct IsdnCardState *) st->l1.hardware;
98 struct sk_buff *skb = arg;
99 u_char cda1_cr, cda2_cr;
100
101 switch (pr) {
102 case (PH_DATA |REQUEST):
103 if (cs->debug &DEB_DLOG_HEX) LogFrame(cs, skb->data, skb->len);
104 if (cs->debug &DEB_DLOG_VERBOSE) dlogframe(cs, skb, 0);
105 if (cs->tx_skb) {
106 skb_queue_tail(&cs->sq, skb);
107 #ifdef L2FRAME_DEBUG
108 if (cs->debug &L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA Queued", 0);
109 #endif
110 } else {
111 cs->tx_skb = skb;
112 cs->tx_cnt = 0;
113 #ifdef L2FRAME_DEBUG
114 if (cs->debug &L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA", 0);
115 #endif
116 dch_fill_fifo(cs);
117 }
118 break;
119
120 case (PH_PULL |INDICATION):
121 if (cs->tx_skb) {
122 if (cs->debug & L1_DEB_WARN)
123 debugl1(cs, " l2l1 tx_skb exist this shouldn't happen");
124 skb_queue_tail(&cs->sq, skb);
125 break;
126 }
127 if (cs->debug & DEB_DLOG_HEX) LogFrame(cs, skb->data, skb->len);
128 if (cs->debug & DEB_DLOG_VERBOSE) dlogframe(cs, skb, 0);
129 cs->tx_skb = skb;
130 cs->tx_cnt = 0;
131 #ifdef L2FRAME_DEBUG
132 if (cs->debug & L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA_PULLED", 0);
133 #endif
134 dch_fill_fifo(cs);
135 break;
136
137 case (PH_PULL | REQUEST):
138 #ifdef L2FRAME_DEBUG
139 if (cs->debug & L1_DEB_LAPD) debugl1(cs, "-> PH_REQUEST_PULL");
140 #endif
141 if (!cs->tx_skb) {
142 clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
143 st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
144 } else
145 set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
146 break;
147
148 case (HW_RESET | REQUEST):
149 case (HW_ENABLE | REQUEST):
150 if ((cs->dc.isac.ph_state == IPACX_IND_RES) ||
151 (cs->dc.isac.ph_state == IPACX_IND_DR) ||
152 (cs->dc.isac.ph_state == IPACX_IND_DC))
153 ph_command(cs, IPACX_CMD_TIM);
154 else
155 ph_command(cs, IPACX_CMD_RES);
156 break;
157
158 case (HW_INFO3 | REQUEST):
159 ph_command(cs, IPACX_CMD_AR8);
160 break;
161
162 case (HW_TESTLOOP | REQUEST):
163 cs->writeisac(cs, IPACX_CDA_TSDP10, 0x80); // Timeslot 0 is B1
164 cs->writeisac(cs, IPACX_CDA_TSDP11, 0x81); // Timeslot 0 is B1
165 cda1_cr = cs->readisac(cs, IPACX_CDA1_CR);
166 cda2_cr = cs->readisac(cs, IPACX_CDA2_CR);
167 if ((long)arg &1) { // loop B1
168 cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr |0x0a);
169 }
170 else { // B1 off
171 cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr &~0x0a);
172 }
173 if ((long)arg &2) { // loop B2
174 cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr |0x14);
175 }
176 else { // B2 off
177 cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr &~0x14);
178 }
179 break;
180
181 case (HW_DEACTIVATE | RESPONSE):
182 skb_queue_purge(&cs->rq);
183 skb_queue_purge(&cs->sq);
184 if (cs->tx_skb) {
185 dev_kfree_skb_any(cs->tx_skb);
186 cs->tx_skb = NULL;
187 }
188 if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
189 del_timer(&cs->dbusytimer);
190 break;
191
192 default:
193 if (cs->debug &L1_DEB_WARN) debugl1(cs, "dch_l2l1 unknown %04x", pr);
194 break;
195 }
196 }
197
198 //----------------------------------------------------------
199 //----------------------------------------------------------
200 static void
201 dbusy_timer_handler(struct IsdnCardState *cs)
202 {
203 struct PStack *st;
204 int rbchd, stard;
205
206 if (test_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
207 rbchd = cs->readisac(cs, IPACX_RBCHD);
208 stard = cs->readisac(cs, IPACX_STARD);
209 if (cs->debug)
210 debugl1(cs, "D-Channel Busy RBCHD %02x STARD %02x", rbchd, stard);
211 if (!(stard &0x40)) { // D-Channel Busy
212 set_bit(FLG_L1_DBUSY, &cs->HW_Flags);
213 for (st = cs->stlist; st; st = st->next) {
214 st->l1.l1l2(st, PH_PAUSE | INDICATION, NULL); // flow control on
215 }
216 } else {
217 // seems we lost an interrupt; reset transceiver */
218 clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags);
219 if (cs->tx_skb) {
220 dev_kfree_skb_any(cs->tx_skb);
221 cs->tx_cnt = 0;
222 cs->tx_skb = NULL;
223 } else {
224 printk(KERN_WARNING "HiSax: ISAC D-Channel Busy no skb\n");
225 debugl1(cs, "D-Channel Busy no skb");
226 }
227 cs->writeisac(cs, IPACX_CMDRD, 0x01); // Tx reset, generates XPR
228 }
229 }
230 }
231
232 //----------------------------------------------------------
233 // Fill buffer from receive FIFO
234 //----------------------------------------------------------
235 static void
236 dch_empty_fifo(struct IsdnCardState *cs, int count)
237 {
238 u_char *ptr;
239
240 if ((cs->debug &L1_DEB_ISAC) && !(cs->debug &L1_DEB_ISAC_FIFO))
241 debugl1(cs, "dch_empty_fifo()");
242
243 // message too large, remove
244 if ((cs->rcvidx + count) >= MAX_DFRAME_LEN_L1) {
245 if (cs->debug &L1_DEB_WARN)
246 debugl1(cs, "dch_empty_fifo() incoming message too large");
247 cs->writeisac(cs, IPACX_CMDRD, 0x80); // RMC
248 cs->rcvidx = 0;
249 return;
250 }
251
252 ptr = cs->rcvbuf + cs->rcvidx;
253 cs->rcvidx += count;
254
255 cs->readisacfifo(cs, ptr, count);
256 cs->writeisac(cs, IPACX_CMDRD, 0x80); // RMC
257
258 if (cs->debug &L1_DEB_ISAC_FIFO) {
259 char *t = cs->dlog;
260
261 t += sprintf(t, "dch_empty_fifo() cnt %d", count);
262 QuickHex(t, ptr, count);
263 debugl1(cs, cs->dlog);
264 }
265 }
266
267 //----------------------------------------------------------
268 // Fill transmit FIFO
269 //----------------------------------------------------------
270 static void
271 dch_fill_fifo(struct IsdnCardState *cs)
272 {
273 int count;
274 u_char cmd, *ptr;
275
276 if ((cs->debug &L1_DEB_ISAC) && !(cs->debug &L1_DEB_ISAC_FIFO))
277 debugl1(cs, "dch_fill_fifo()");
278
279 if (!cs->tx_skb) return;
280 count = cs->tx_skb->len;
281 if (count <= 0) return;
282
283 if (count > D_FIFO_SIZE) {
284 count = D_FIFO_SIZE;
285 cmd = 0x08; // XTF
286 } else {
287 cmd = 0x0A; // XTF | XME
288 }
289
290 ptr = cs->tx_skb->data;
291 skb_pull(cs->tx_skb, count);
292 cs->tx_cnt += count;
293 cs->writeisacfifo(cs, ptr, count);
294 cs->writeisac(cs, IPACX_CMDRD, cmd);
295
296 // set timeout for transmission contol
297 if (test_and_set_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
298 debugl1(cs, "dch_fill_fifo dbusytimer running");
299 del_timer(&cs->dbusytimer);
300 }
301 init_timer(&cs->dbusytimer);
302 cs->dbusytimer.expires = jiffies + ((DBUSY_TIMER_VALUE * HZ)/1000);
303 add_timer(&cs->dbusytimer);
304
305 if (cs->debug &L1_DEB_ISAC_FIFO) {
306 char *t = cs->dlog;
307
308 t += sprintf(t, "dch_fill_fifo() cnt %d", count);
309 QuickHex(t, ptr, count);
310 debugl1(cs, cs->dlog);
311 }
312 }
313
314 //----------------------------------------------------------
315 // D channel interrupt handler
316 //----------------------------------------------------------
317 static inline void
318 dch_int(struct IsdnCardState *cs)
319 {
320 struct sk_buff *skb;
321 u_char istad, rstad;
322 int count;
323
324 istad = cs->readisac(cs, IPACX_ISTAD);
325 //##############################################
326 // printk(KERN_WARNING "dch_int(istad=%02x)\n", istad);
327 //##############################################
328
329 if (istad &0x80) { // RME
330 rstad = cs->readisac(cs, IPACX_RSTAD);
331 if ((rstad &0xf0) != 0xa0) { // !(VFR && !RDO && CRC && !RAB)
332 if (!(rstad &0x80))
333 if (cs->debug &L1_DEB_WARN)
334 debugl1(cs, "dch_int(): invalid frame");
335 if ((rstad &0x40))
336 if (cs->debug &L1_DEB_WARN)
337 debugl1(cs, "dch_int(): RDO");
338 if (!(rstad &0x20))
339 if (cs->debug &L1_DEB_WARN)
340 debugl1(cs, "dch_int(): CRC error");
341 cs->writeisac(cs, IPACX_CMDRD, 0x80); // RMC
342 } else { // received frame ok
343 count = cs->readisac(cs, IPACX_RBCLD);
344 if (count) count--; // RSTAB is last byte
345 count &= D_FIFO_SIZE-1;
346 if (count == 0) count = D_FIFO_SIZE;
347 dch_empty_fifo(cs, count);
348 if ((count = cs->rcvidx) > 0) {
349 cs->rcvidx = 0;
350 if (!(skb = dev_alloc_skb(count)))
351 printk(KERN_WARNING "HiSax dch_int(): receive out of memory\n");
352 else {
353 memcpy(skb_put(skb, count), cs->rcvbuf, count);
354 skb_queue_tail(&cs->rq, skb);
355 }
356 }
357 }
358 cs->rcvidx = 0;
359 schedule_event(cs, D_RCVBUFREADY);
360 }
361
362 if (istad &0x40) { // RPF
363 dch_empty_fifo(cs, D_FIFO_SIZE);
364 }
365
366 if (istad &0x20) { // RFO
367 if (cs->debug &L1_DEB_WARN) debugl1(cs, "dch_int(): RFO");
368 cs->writeisac(cs, IPACX_CMDRD, 0x40); //RRES
369 }
370
371 if (istad &0x10) { // XPR
372 if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
373 del_timer(&cs->dbusytimer);
374 if (test_and_clear_bit(FLG_L1_DBUSY, &cs->HW_Flags))
375 schedule_event(cs, D_CLEARBUSY);
376 if (cs->tx_skb) {
377 if (cs->tx_skb->len) {
378 dch_fill_fifo(cs);
379 goto afterXPR;
380 }
381 else {
382 dev_kfree_skb_irq(cs->tx_skb);
383 cs->tx_skb = NULL;
384 cs->tx_cnt = 0;
385 }
386 }
387 if ((cs->tx_skb = skb_dequeue(&cs->sq))) {
388 cs->tx_cnt = 0;
389 dch_fill_fifo(cs);
390 }
391 else {
392 schedule_event(cs, D_XMTBUFREADY);
393 }
394 }
395 afterXPR:
396
397 if (istad &0x0C) { // XDU or XMR
398 if (cs->debug &L1_DEB_WARN) debugl1(cs, "dch_int(): XDU");
399 if (cs->tx_skb) {
400 skb_push(cs->tx_skb, cs->tx_cnt); // retransmit
401 cs->tx_cnt = 0;
402 dch_fill_fifo(cs);
403 } else {
404 printk(KERN_WARNING "HiSax: ISAC XDU no skb\n");
405 debugl1(cs, "ISAC XDU no skb");
406 }
407 }
408 }
409
410 //----------------------------------------------------------
411 //----------------------------------------------------------
412 static void __devinit
413 dch_setstack(struct PStack *st, struct IsdnCardState *cs)
414 {
415 st->l1.l1hw = dch_l2l1;
416 }
417
418 //----------------------------------------------------------
419 //----------------------------------------------------------
420 static void __devinit
421 dch_init(struct IsdnCardState *cs)
422 {
423 printk(KERN_INFO "HiSax: IPACX ISDN driver v0.1.0\n");
424
425 cs->setstack_d = dch_setstack;
426
427 cs->dbusytimer.function = (void *) dbusy_timer_handler;
428 cs->dbusytimer.data = (long) cs;
429 init_timer(&cs->dbusytimer);
430
431 cs->writeisac(cs, IPACX_TR_CONF0, 0x00); // clear LDD
432 cs->writeisac(cs, IPACX_TR_CONF2, 0x00); // enable transmitter
433 cs->writeisac(cs, IPACX_MODED, 0xC9); // transparent mode 0, RAC, stop/go
434 cs->writeisac(cs, IPACX_MON_CR, 0x00); // disable monitor channel
435 }
436
437
438 //==========================================================
439 // B channel functions
440 //==========================================================
441
442 //----------------------------------------------------------
443 // Entry point for commands
444 //----------------------------------------------------------
445 static void
446 bch_l2l1(struct PStack *st, int pr, void *arg)
447 {
448 struct BCState *bcs = st->l1.bcs;
449 struct sk_buff *skb = arg;
450 u_long flags;
451
452 switch (pr) {
453 case (PH_DATA | REQUEST):
454 spin_lock_irqsave(&bcs->cs->lock, flags);
455 if (bcs->tx_skb) {
456 skb_queue_tail(&bcs->squeue, skb);
457 } else {
458 bcs->tx_skb = skb;
459 set_bit(BC_FLG_BUSY, &bcs->Flag);
460 bcs->hw.hscx.count = 0;
461 bch_fill_fifo(bcs);
462 }
463 spin_unlock_irqrestore(&bcs->cs->lock, flags);
464 break;
465 case (PH_PULL | INDICATION):
466 spin_lock_irqsave(&bcs->cs->lock, flags);
467 if (bcs->tx_skb) {
468 printk(KERN_WARNING "HiSax bch_l2l1(): this shouldn't happen\n");
469 } else {
470 set_bit(BC_FLG_BUSY, &bcs->Flag);
471 bcs->tx_skb = skb;
472 bcs->hw.hscx.count = 0;
473 bch_fill_fifo(bcs);
474 }
475 spin_unlock_irqrestore(&bcs->cs->lock, flags);
476 break;
477 case (PH_PULL | REQUEST):
478 if (!bcs->tx_skb) {
479 clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
480 st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
481 } else
482 set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
483 break;
484 case (PH_ACTIVATE | REQUEST):
485 spin_lock_irqsave(&bcs->cs->lock, flags);
486 set_bit(BC_FLG_ACTIV, &bcs->Flag);
487 bch_mode(bcs, st->l1.mode, st->l1.bc);
488 spin_unlock_irqrestore(&bcs->cs->lock, flags);
489 l1_msg_b(st, pr, arg);
490 break;
491 case (PH_DEACTIVATE | REQUEST):
492 l1_msg_b(st, pr, arg);
493 break;
494 case (PH_DEACTIVATE | CONFIRM):
495 spin_lock_irqsave(&bcs->cs->lock, flags);
496 clear_bit(BC_FLG_ACTIV, &bcs->Flag);
497 clear_bit(BC_FLG_BUSY, &bcs->Flag);
498 bch_mode(bcs, 0, st->l1.bc);
499 spin_unlock_irqrestore(&bcs->cs->lock, flags);
500 st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
501 break;
502 }
503 }
504
505 //----------------------------------------------------------
506 // Read B channel fifo to receive buffer
507 //----------------------------------------------------------
508 static void
509 bch_empty_fifo(struct BCState *bcs, int count)
510 {
511 u_char *ptr, hscx;
512 struct IsdnCardState *cs;
513 int cnt;
514
515 cs = bcs->cs;
516 hscx = bcs->hw.hscx.hscx;
517 if ((cs->debug &L1_DEB_HSCX) && !(cs->debug &L1_DEB_HSCX_FIFO))
518 debugl1(cs, "bch_empty_fifo()");
519
520 // message too large, remove
521 if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
522 if (cs->debug &L1_DEB_WARN)
523 debugl1(cs, "bch_empty_fifo() incoming packet too large");
524 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80); // RMC
525 bcs->hw.hscx.rcvidx = 0;
526 return;
527 }
528
529 ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
530 cnt = count;
531 while (cnt--) *ptr++ = cs->BC_Read_Reg(cs, hscx, IPACX_RFIFOB);
532 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80); // RMC
533
534 ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
535 bcs->hw.hscx.rcvidx += count;
536
537 if (cs->debug &L1_DEB_HSCX_FIFO) {
538 char *t = bcs->blog;
539
540 t += sprintf(t, "bch_empty_fifo() B-%d cnt %d", hscx, count);
541 QuickHex(t, ptr, count);
542 debugl1(cs, bcs->blog);
543 }
544 }
545
546 //----------------------------------------------------------
547 // Fill buffer to transmit FIFO
548 //----------------------------------------------------------
549 static void
550 bch_fill_fifo(struct BCState *bcs)
551 {
552 struct IsdnCardState *cs;
553 int more, count, cnt;
554 u_char *ptr, *p, hscx;
555
556 cs = bcs->cs;
557 if ((cs->debug &L1_DEB_HSCX) && !(cs->debug &L1_DEB_HSCX_FIFO))
558 debugl1(cs, "bch_fill_fifo()");
559
560 if (!bcs->tx_skb) return;
561 if (bcs->tx_skb->len <= 0) return;
562
563 hscx = bcs->hw.hscx.hscx;
564 more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
565 if (bcs->tx_skb->len > B_FIFO_SIZE) {
566 more = 1;
567 count = B_FIFO_SIZE;
568 } else {
569 count = bcs->tx_skb->len;
570 }
571 cnt = count;
572
573 p = ptr = bcs->tx_skb->data;
574 skb_pull(bcs->tx_skb, count);
575 bcs->tx_cnt -= count;
576 bcs->hw.hscx.count += count;
577 while (cnt--) cs->BC_Write_Reg(cs, hscx, IPACX_XFIFOB, *p++);
578 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, (more ? 0x08 : 0x0a));
579
580 if (cs->debug &L1_DEB_HSCX_FIFO) {
581 char *t = bcs->blog;
582
583 t += sprintf(t, "chb_fill_fifo() B-%d cnt %d", hscx, count);
584 QuickHex(t, ptr, count);
585 debugl1(cs, bcs->blog);
586 }
587 }
588
589 //----------------------------------------------------------
590 // B channel interrupt handler
591 //----------------------------------------------------------
592 static void
593 bch_int(struct IsdnCardState *cs, u_char hscx)
594 {
595 u_char istab;
596 struct BCState *bcs;
597 struct sk_buff *skb;
598 int count;
599 u_char rstab;
600
601 bcs = cs->bcs + hscx;
602 istab = cs->BC_Read_Reg(cs, hscx, IPACX_ISTAB);
603 //##############################################
604 // printk(KERN_WARNING "bch_int(istab=%02x)\n", istab);
605 //##############################################
606 if (!test_bit(BC_FLG_INIT, &bcs->Flag)) return;
607
608 if (istab &0x80) { // RME
609 rstab = cs->BC_Read_Reg(cs, hscx, IPACX_RSTAB);
610 if ((rstab &0xf0) != 0xa0) { // !(VFR && !RDO && CRC && !RAB)
611 if (!(rstab &0x80))
612 if (cs->debug &L1_DEB_WARN)
613 debugl1(cs, "bch_int() B-%d: invalid frame", hscx);
614 if ((rstab &0x40) && (bcs->mode != L1_MODE_NULL))
615 if (cs->debug &L1_DEB_WARN)
616 debugl1(cs, "bch_int() B-%d: RDO mode=%d", hscx, bcs->mode);
617 if (!(rstab &0x20))
618 if (cs->debug &L1_DEB_WARN)
619 debugl1(cs, "bch_int() B-%d: CRC error", hscx);
620 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80); // RMC
621 }
622 else { // received frame ok
623 count = cs->BC_Read_Reg(cs, hscx, IPACX_RBCLB) &(B_FIFO_SIZE-1);
624 if (count == 0) count = B_FIFO_SIZE;
625 bch_empty_fifo(bcs, count);
626 if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
627 if (cs->debug &L1_DEB_HSCX_FIFO)
628 debugl1(cs, "bch_int Frame %d", count);
629 if (!(skb = dev_alloc_skb(count)))
630 printk(KERN_WARNING "HiSax bch_int(): receive frame out of memory\n");
631 else {
632 memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
633 skb_queue_tail(&bcs->rqueue, skb);
634 }
635 }
636 }
637 bcs->hw.hscx.rcvidx = 0;
638 schedule_event(bcs, B_RCVBUFREADY);
639 }
640
641 if (istab &0x40) { // RPF
642 bch_empty_fifo(bcs, B_FIFO_SIZE);
643
644 if (bcs->mode == L1_MODE_TRANS) { // queue every chunk
645 // receive transparent audio data
646 if (!(skb = dev_alloc_skb(B_FIFO_SIZE)))
647 printk(KERN_WARNING "HiSax bch_int(): receive transparent out of memory\n");
648 else {
649 memcpy(skb_put(skb, B_FIFO_SIZE), bcs->hw.hscx.rcvbuf, B_FIFO_SIZE);
650 skb_queue_tail(&bcs->rqueue, skb);
651 }
652 bcs->hw.hscx.rcvidx = 0;
653 schedule_event(bcs, B_RCVBUFREADY);
654 }
655 }
656
657 if (istab &0x20) { // RFO
658 if (cs->debug &L1_DEB_WARN)
659 debugl1(cs, "bch_int() B-%d: RFO error", hscx);
660 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x40); // RRES
661 }
662
663 if (istab &0x10) { // XPR
664 if (bcs->tx_skb) {
665 if (bcs->tx_skb->len) {
666 bch_fill_fifo(bcs);
667 goto afterXPR;
668 } else {
669 if (test_bit(FLG_LLI_L1WAKEUP,&bcs->st->lli.flag) &&
670 (PACKET_NOACK != bcs->tx_skb->pkt_type)) {
671 u_long flags;
672 spin_lock_irqsave(&bcs->aclock, flags);
673 bcs->ackcnt += bcs->hw.hscx.count;
674 spin_unlock_irqrestore(&bcs->aclock, flags);
675 schedule_event(bcs, B_ACKPENDING);
676 }
677 }
678 dev_kfree_skb_irq(bcs->tx_skb);
679 bcs->hw.hscx.count = 0;
680 bcs->tx_skb = NULL;
681 }
682 if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
683 bcs->hw.hscx.count = 0;
684 set_bit(BC_FLG_BUSY, &bcs->Flag);
685 bch_fill_fifo(bcs);
686 } else {
687 clear_bit(BC_FLG_BUSY, &bcs->Flag);
688 schedule_event(bcs, B_XMTBUFREADY);
689 }
690 }
691 afterXPR:
692
693 if (istab &0x04) { // XDU
694 if (bcs->mode == L1_MODE_TRANS) {
695 bch_fill_fifo(bcs);
696 }
697 else {
698 if (bcs->tx_skb) { // restart transmitting the whole frame
699 skb_push(bcs->tx_skb, bcs->hw.hscx.count);
700 bcs->tx_cnt += bcs->hw.hscx.count;
701 bcs->hw.hscx.count = 0;
702 }
703 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x01); // XRES
704 if (cs->debug &L1_DEB_WARN)
705 debugl1(cs, "bch_int() B-%d XDU error", hscx);
706 }
707 }
708 }
709
710 //----------------------------------------------------------
711 //----------------------------------------------------------
712 static void
713 bch_mode(struct BCState *bcs, int mode, int bc)
714 {
715 struct IsdnCardState *cs = bcs->cs;
716 int hscx = bcs->hw.hscx.hscx;
717
718 bc = bc ? 1 : 0; // in case bc is greater than 1
719 if (cs->debug & L1_DEB_HSCX)
720 debugl1(cs, "mode_bch() switch B-% mode %d chan %d", hscx, mode, bc);
721 bcs->mode = mode;
722 bcs->channel = bc;
723
724 // map controller to according timeslot
725 if (!hscx)
726 {
727 cs->writeisac(cs, IPACX_BCHA_TSDP_BC1, 0x80 | bc);
728 cs->writeisac(cs, IPACX_BCHA_CR, 0x88);
729 }
730 else
731 {
732 cs->writeisac(cs, IPACX_BCHB_TSDP_BC1, 0x80 | bc);
733 cs->writeisac(cs, IPACX_BCHB_CR, 0x88);
734 }
735
736 switch (mode) {
737 case (L1_MODE_NULL):
738 cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0xC0); // rec off
739 cs->BC_Write_Reg(cs, hscx, IPACX_EXMB, 0x30); // std adj.
740 cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, 0xFF); // ints off
741 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41); // validate adjustments
742 break;
743 case (L1_MODE_TRANS):
744 cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0x88); // ext transp mode
745 cs->BC_Write_Reg(cs, hscx, IPACX_EXMB, 0x00); // xxx00000
746 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41); // validate adjustments
747 cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, _MASKB_IMASK);
748 break;
749 case (L1_MODE_HDLC):
750 cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0xC8); // transp mode 0
751 cs->BC_Write_Reg(cs, hscx, IPACX_EXMB, 0x01); // idle=hdlc flags crc enabled
752 cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41); // validate adjustments
753 cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, _MASKB_IMASK);
754 break;
755 }
756 }
757
758 //----------------------------------------------------------
759 //----------------------------------------------------------
760 static void
761 bch_close_state(struct BCState *bcs)
762 {
763 bch_mode(bcs, 0, bcs->channel);
764 if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
765 if (bcs->hw.hscx.rcvbuf) {
766 kfree(bcs->hw.hscx.rcvbuf);
767 bcs->hw.hscx.rcvbuf = NULL;
768 }
769 if (bcs->blog) {
770 kfree(bcs->blog);
771 bcs->blog = NULL;
772 }
773 skb_queue_purge(&bcs->rqueue);
774 skb_queue_purge(&bcs->squeue);
775 if (bcs->tx_skb) {
776 dev_kfree_skb_any(bcs->tx_skb);
777 bcs->tx_skb = NULL;
778 clear_bit(BC_FLG_BUSY, &bcs->Flag);
779 }
780 }
781 }
782
783 //----------------------------------------------------------
784 //----------------------------------------------------------
785 static int
786 bch_open_state(struct IsdnCardState *cs, struct BCState *bcs)
787 {
788 if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
789 if (!(bcs->hw.hscx.rcvbuf = kmalloc(HSCX_BUFMAX, GFP_ATOMIC))) {
790 printk(KERN_WARNING
791 "HiSax open_bchstate(): No memory for hscx.rcvbuf\n");
792 clear_bit(BC_FLG_INIT, &bcs->Flag);
793 return (1);
794 }
795 if (!(bcs->blog = kmalloc(MAX_BLOG_SPACE, GFP_ATOMIC))) {
796 printk(KERN_WARNING
797 "HiSax open_bchstate: No memory for bcs->blog\n");
798 clear_bit(BC_FLG_INIT, &bcs->Flag);
799 kfree(bcs->hw.hscx.rcvbuf);
800 bcs->hw.hscx.rcvbuf = NULL;
801 return (2);
802 }
803 skb_queue_head_init(&bcs->rqueue);
804 skb_queue_head_init(&bcs->squeue);
805 }
806 bcs->tx_skb = NULL;
807 clear_bit(BC_FLG_BUSY, &bcs->Flag);
808 bcs->event = 0;
809 bcs->hw.hscx.rcvidx = 0;
810 bcs->tx_cnt = 0;
811 return (0);
812 }
813
814 //----------------------------------------------------------
815 //----------------------------------------------------------
816 static int
817 bch_setstack(struct PStack *st, struct BCState *bcs)
818 {
819 bcs->channel = st->l1.bc;
820 if (bch_open_state(st->l1.hardware, bcs)) return (-1);
821 st->l1.bcs = bcs;
822 st->l2.l2l1 = bch_l2l1;
823 setstack_manager(st);
824 bcs->st = st;
825 setstack_l1_B(st);
826 return (0);
827 }
828
829 //----------------------------------------------------------
830 //----------------------------------------------------------
831 static void __devinit
832 bch_init(struct IsdnCardState *cs, int hscx)
833 {
834 cs->bcs[hscx].BC_SetStack = bch_setstack;
835 cs->bcs[hscx].BC_Close = bch_close_state;
836 cs->bcs[hscx].hw.hscx.hscx = hscx;
837 cs->bcs[hscx].cs = cs;
838 bch_mode(cs->bcs + hscx, 0, hscx);
839 }
840
841
842 //==========================================================
843 // Shared functions
844 //==========================================================
845
846 //----------------------------------------------------------
847 // Main interrupt handler
848 //----------------------------------------------------------
849 void
850 interrupt_ipacx(struct IsdnCardState *cs)
851 {
852 u_char ista;
853
854 while ((ista = cs->readisac(cs, IPACX_ISTA))) {
855 //#################################################
856 // printk(KERN_WARNING "interrupt_ipacx(ista=%02x)\n", ista);
857 //#################################################
858 if (ista &0x80) bch_int(cs, 0); // B channel interrupts
859 if (ista &0x40) bch_int(cs, 1);
860
861 if (ista &0x01) dch_int(cs); // D channel
862 if (ista &0x10) cic_int(cs); // Layer 1 state
863 }
864 }
865
866 //----------------------------------------------------------
867 // Clears chip interrupt status
868 //----------------------------------------------------------
869 static void __init
870 clear_pending_ints(struct IsdnCardState *cs)
871 {
872 int ista;
873
874 // all interrupts off
875 cs->writeisac(cs, IPACX_MASK, 0xff);
876 cs->writeisac(cs, IPACX_MASKD, 0xff);
877 cs->BC_Write_Reg(cs, 0, IPACX_MASKB, 0xff);
878 cs->BC_Write_Reg(cs, 1, IPACX_MASKB, 0xff);
879
880 ista = cs->readisac(cs, IPACX_ISTA);
881 if (ista &0x80) cs->BC_Read_Reg(cs, 0, IPACX_ISTAB);
882 if (ista &0x40) cs->BC_Read_Reg(cs, 1, IPACX_ISTAB);
883 if (ista &0x10) cs->readisac(cs, IPACX_CIR0);
884 if (ista &0x01) cs->readisac(cs, IPACX_ISTAD);
885 }
886
887 //----------------------------------------------------------
888 // Does chip configuration work
889 // Work to do depends on bit mask in part
890 //----------------------------------------------------------
891 void __init
892 init_ipacx(struct IsdnCardState *cs, int part)
893 {
894 if (part &1) { // initialise chip
895 //##################################################
896 // printk(KERN_INFO "init_ipacx(%x)\n", part);
897 //##################################################
898 clear_pending_ints(cs);
899 bch_init(cs, 0);
900 bch_init(cs, 1);
901 dch_init(cs);
902 }
903 if (part &2) { // reenable all interrupts and start chip
904 cs->BC_Write_Reg(cs, 0, IPACX_MASKB, _MASKB_IMASK);
905 cs->BC_Write_Reg(cs, 1, IPACX_MASKB, _MASKB_IMASK);
906 cs->writeisac(cs, IPACX_MASKD, _MASKD_IMASK);
907 cs->writeisac(cs, IPACX_MASK, _MASK_IMASK); // global mask register
908
909 // reset HDLC Transmitters/receivers
910 cs->writeisac(cs, IPACX_CMDRD, 0x41);
911 cs->BC_Write_Reg(cs, 0, IPACX_CMDRB, 0x41);
912 cs->BC_Write_Reg(cs, 1, IPACX_CMDRB, 0x41);
913 ph_command(cs, IPACX_CMD_RES);
914 }
915 }
916
917 //----------------- end of file -----------------------
918
Linux with added FPC-III support