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Do dirty page accounting when removing a page from the page cache
[pv_ops_mirror.git] / drivers / isdn / hisax / hisax_isac.c
blobd0fefcf999cb7226b89e81c50021cfc1be263ee9
1 /*
2 * Driver for ISAC-S and ISAC-SX
3 * ISDN Subscriber Access Controller for Terminals
4 *
5 * Author Kai Germaschewski
6 * Copyright 2001 by Kai Germaschewski <kai.germaschewski@gmx.de>
7 * 2001 by Karsten Keil <keil@isdn4linux.de>
8 *
9 * based upon Karsten Keil's original isac.c driver
10 *
11 * This software may be used and distributed according to the terms
12 * of the GNU General Public License, incorporated herein by reference.
13 *
14 * Thanks to Wizard Computersysteme GmbH, Bremervoerde and
15 * SoHaNet Technology GmbH, Berlin
16 * for supporting the development of this driver
17 */
18
19 /* TODO:
20 * specifically handle level vs edge triggered?
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/netdevice.h>
26 #include "hisax_isac.h"
27
28 // debugging cruft
29
30 #define __debug_variable debug
31 #include "hisax_debug.h"
32
33 #ifdef CONFIG_HISAX_DEBUG
34 static int debug = 1;
35 module_param(debug, int, 0);
36
37 static char *ISACVer[] = {
38 "2086/2186 V1.1",
39 "2085 B1",
40 "2085 B2",
41 "2085 V2.3"
42 };
43 #endif
44
45 MODULE_AUTHOR("Kai Germaschewski <kai.germaschewski@gmx.de>/Karsten Keil <kkeil@suse.de>");
46 MODULE_DESCRIPTION("ISAC/ISAC-SX driver");
47 MODULE_LICENSE("GPL");
48
49 #define DBG_WARN 0x0001
50 #define DBG_IRQ 0x0002
51 #define DBG_L1M 0x0004
52 #define DBG_PR 0x0008
53 #define DBG_RFIFO 0x0100
54 #define DBG_RPACKET 0x0200
55 #define DBG_XFIFO 0x1000
56 #define DBG_XPACKET 0x2000
57
58 // we need to distinguish ISAC-S and ISAC-SX
59 #define TYPE_ISAC 0x00
60 #define TYPE_ISACSX 0x01
61
62 // registers etc.
63 #define ISAC_MASK 0x20
64 #define ISAC_ISTA 0x20
65 #define ISAC_ISTA_EXI 0x01
66 #define ISAC_ISTA_SIN 0x02
67 #define ISAC_ISTA_CISQ 0x04
68 #define ISAC_ISTA_XPR 0x10
69 #define ISAC_ISTA_RSC 0x20
70 #define ISAC_ISTA_RPF 0x40
71 #define ISAC_ISTA_RME 0x80
72
73 #define ISAC_STAR 0x21
74 #define ISAC_CMDR 0x21
75 #define ISAC_CMDR_XRES 0x01
76 #define ISAC_CMDR_XME 0x02
77 #define ISAC_CMDR_XTF 0x08
78 #define ISAC_CMDR_RRES 0x40
79 #define ISAC_CMDR_RMC 0x80
80
81 #define ISAC_EXIR 0x24
82 #define ISAC_EXIR_MOS 0x04
83 #define ISAC_EXIR_XDU 0x40
84 #define ISAC_EXIR_XMR 0x80
85
86 #define ISAC_ADF2 0x39
87 #define ISAC_SPCR 0x30
88 #define ISAC_ADF1 0x38
89
90 #define ISAC_CIR0 0x31
91 #define ISAC_CIX0 0x31
92 #define ISAC_CIR0_CIC0 0x02
93 #define ISAC_CIR0_CIC1 0x01
94
95 #define ISAC_CIR1 0x33
96 #define ISAC_CIX1 0x33
97 #define ISAC_STCR 0x37
98 #define ISAC_MODE 0x22
99
100 #define ISAC_RSTA 0x27
101 #define ISAC_RSTA_RDO 0x40
102 #define ISAC_RSTA_CRC 0x20
103 #define ISAC_RSTA_RAB 0x10
104
105 #define ISAC_RBCL 0x25
106 #define ISAC_RBCH 0x2A
107 #define ISAC_TIMR 0x23
108 #define ISAC_SQXR 0x3b
109 #define ISAC_MOSR 0x3a
110 #define ISAC_MOCR 0x3a
111 #define ISAC_MOR0 0x32
112 #define ISAC_MOX0 0x32
113 #define ISAC_MOR1 0x34
114 #define ISAC_MOX1 0x34
115
116 #define ISAC_RBCH_XAC 0x80
117
118 #define ISAC_CMD_TIM 0x0
119 #define ISAC_CMD_RES 0x1
120 #define ISAC_CMD_SSP 0x2
121 #define ISAC_CMD_SCP 0x3
122 #define ISAC_CMD_AR8 0x8
123 #define ISAC_CMD_AR10 0x9
124 #define ISAC_CMD_ARL 0xa
125 #define ISAC_CMD_DI 0xf
126
127 #define ISACSX_MASK 0x60
128 #define ISACSX_ISTA 0x60
129 #define ISACSX_ISTA_ICD 0x01
130 #define ISACSX_ISTA_CIC 0x10
131
132 #define ISACSX_MASKD 0x20
133 #define ISACSX_ISTAD 0x20
134 #define ISACSX_ISTAD_XDU 0x04
135 #define ISACSX_ISTAD_XMR 0x08
136 #define ISACSX_ISTAD_XPR 0x10
137 #define ISACSX_ISTAD_RFO 0x20
138 #define ISACSX_ISTAD_RPF 0x40
139 #define ISACSX_ISTAD_RME 0x80
140
141 #define ISACSX_CMDRD 0x21
142 #define ISACSX_CMDRD_XRES 0x01
143 #define ISACSX_CMDRD_XME 0x02
144 #define ISACSX_CMDRD_XTF 0x08
145 #define ISACSX_CMDRD_RRES 0x40
146 #define ISACSX_CMDRD_RMC 0x80
147
148 #define ISACSX_MODED 0x22
149
150 #define ISACSX_RBCLD 0x26
151
152 #define ISACSX_RSTAD 0x28
153 #define ISACSX_RSTAD_RAB 0x10
154 #define ISACSX_RSTAD_CRC 0x20
155 #define ISACSX_RSTAD_RDO 0x40
156 #define ISACSX_RSTAD_VFR 0x80
157
158 #define ISACSX_CIR0 0x2e
159 #define ISACSX_CIR0_CIC0 0x08
160 #define ISACSX_CIX0 0x2e
161
162 #define ISACSX_TR_CONF0 0x30
163
164 #define ISACSX_TR_CONF2 0x32
165
166 static struct Fsm l1fsm;
167
168 enum {
169 ST_L1_RESET,
170 ST_L1_F3_PDOWN,
171 ST_L1_F3_PUP,
172 ST_L1_F3_PEND_DEACT,
173 ST_L1_F4,
174 ST_L1_F5,
175 ST_L1_F6,
176 ST_L1_F7,
177 ST_L1_F8,
178 };
179
180 #define L1_STATE_COUNT (ST_L1_F8+1)
181
182 static char *strL1State[] =
183 {
184 "ST_L1_RESET",
185 "ST_L1_F3_PDOWN",
186 "ST_L1_F3_PUP",
187 "ST_L1_F3_PEND_DEACT",
188 "ST_L1_F4",
189 "ST_L1_F5",
190 "ST_L1_F6",
191 "ST_L1_F7",
192 "ST_L1_F8",
193 };
194
195 enum {
196 EV_PH_DR, // 0000
197 EV_PH_RES, // 0001
198 EV_PH_TMA, // 0010
199 EV_PH_SLD, // 0011
200 EV_PH_RSY, // 0100
201 EV_PH_DR6, // 0101
202 EV_PH_EI, // 0110
203 EV_PH_PU, // 0111
204 EV_PH_AR, // 1000
205 EV_PH_9, // 1001
206 EV_PH_ARL, // 1010
207 EV_PH_CVR, // 1011
208 EV_PH_AI8, // 1100
209 EV_PH_AI10, // 1101
210 EV_PH_AIL, // 1110
211 EV_PH_DC, // 1111
212 EV_PH_ACTIVATE_REQ,
213 EV_PH_DEACTIVATE_REQ,
214 EV_TIMER3,
215 };
216
217 #define L1_EVENT_COUNT (EV_TIMER3 + 1)
218
219 static char *strL1Event[] =
220 {
221 "EV_PH_DR", // 0000
222 "EV_PH_RES", // 0001
223 "EV_PH_TMA", // 0010
224 "EV_PH_SLD", // 0011
225 "EV_PH_RSY", // 0100
226 "EV_PH_DR6", // 0101
227 "EV_PH_EI", // 0110
228 "EV_PH_PU", // 0111
229 "EV_PH_AR", // 1000
230 "EV_PH_9", // 1001
231 "EV_PH_ARL", // 1010
232 "EV_PH_CVR", // 1011
233 "EV_PH_AI8", // 1100
234 "EV_PH_AI10", // 1101
235 "EV_PH_AIL", // 1110
236 "EV_PH_DC", // 1111
237 "EV_PH_ACTIVATE_REQ",
238 "EV_PH_DEACTIVATE_REQ",
239 "EV_TIMER3",
240 };
241
242 static inline void D_L1L2(struct isac *isac, int pr, void *arg)
243 {
244 struct hisax_if *ifc = (struct hisax_if *) &isac->hisax_d_if;
245
246 DBG(DBG_PR, "pr %#x", pr);
247 ifc->l1l2(ifc, pr, arg);
248 }
249
250 static void ph_command(struct isac *isac, unsigned int command)
251 {
252 DBG(DBG_L1M, "ph_command %#x", command);
253 switch (isac->type) {
254 case TYPE_ISAC:
255 isac->write_isac(isac, ISAC_CIX0, (command << 2) | 3);
256 break;
257 case TYPE_ISACSX:
258 isac->write_isac(isac, ISACSX_CIX0, (command << 4) | (7 << 1));
259 break;
260 }
261 }
262
263 // ----------------------------------------------------------------------
264
265 static void l1_di(struct FsmInst *fi, int event, void *arg)
266 {
267 struct isac *isac = fi->userdata;
268
269 FsmChangeState(fi, ST_L1_RESET);
270 ph_command(isac, ISAC_CMD_DI);
271 }
272
273 static void l1_di_deact_ind(struct FsmInst *fi, int event, void *arg)
274 {
275 struct isac *isac = fi->userdata;
276
277 FsmChangeState(fi, ST_L1_RESET);
278 D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
279 ph_command(isac, ISAC_CMD_DI);
280 }
281
282 static void l1_go_f3pdown(struct FsmInst *fi, int event, void *arg)
283 {
284 FsmChangeState(fi, ST_L1_F3_PDOWN);
285 }
286
287 static void l1_go_f3pend_deact_ind(struct FsmInst *fi, int event, void *arg)
288 {
289 struct isac *isac = fi->userdata;
290
291 FsmChangeState(fi, ST_L1_F3_PEND_DEACT);
292 D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
293 ph_command(isac, ISAC_CMD_DI);
294 }
295
296 static void l1_go_f3pend(struct FsmInst *fi, int event, void *arg)
297 {
298 struct isac *isac = fi->userdata;
299
300 FsmChangeState(fi, ST_L1_F3_PEND_DEACT);
301 ph_command(isac, ISAC_CMD_DI);
302 }
303
304 static void l1_go_f4(struct FsmInst *fi, int event, void *arg)
305 {
306 FsmChangeState(fi, ST_L1_F4);
307 }
308
309 static void l1_go_f5(struct FsmInst *fi, int event, void *arg)
310 {
311 FsmChangeState(fi, ST_L1_F5);
312 }
313
314 static void l1_go_f6(struct FsmInst *fi, int event, void *arg)
315 {
316 FsmChangeState(fi, ST_L1_F6);
317 }
318
319 static void l1_go_f6_deact_ind(struct FsmInst *fi, int event, void *arg)
320 {
321 struct isac *isac = fi->userdata;
322
323 FsmChangeState(fi, ST_L1_F6);
324 D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
325 }
326
327 static void l1_go_f7_act_ind(struct FsmInst *fi, int event, void *arg)
328 {
329 struct isac *isac = fi->userdata;
330
331 FsmDelTimer(&isac->timer, 0);
332 FsmChangeState(fi, ST_L1_F7);
333 ph_command(isac, ISAC_CMD_AR8);
334 D_L1L2(isac, PH_ACTIVATE | INDICATION, NULL);
335 }
336
337 static void l1_go_f8(struct FsmInst *fi, int event, void *arg)
338 {
339 FsmChangeState(fi, ST_L1_F8);
340 }
341
342 static void l1_go_f8_deact_ind(struct FsmInst *fi, int event, void *arg)
343 {
344 struct isac *isac = fi->userdata;
345
346 FsmChangeState(fi, ST_L1_F8);
347 D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
348 }
349
350 static void l1_ar8(struct FsmInst *fi, int event, void *arg)
351 {
352 struct isac *isac = fi->userdata;
353
354 FsmRestartTimer(&isac->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
355 ph_command(isac, ISAC_CMD_AR8);
356 }
357
358 static void l1_timer3(struct FsmInst *fi, int event, void *arg)
359 {
360 struct isac *isac = fi->userdata;
361
362 ph_command(isac, ISAC_CMD_DI);
363 D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
364 }
365
366 // state machines according to data sheet PSB 2186 / 3186
367
368 static struct FsmNode L1FnList[] __initdata =
369 {
370 {ST_L1_RESET, EV_PH_RES, l1_di},
371 {ST_L1_RESET, EV_PH_EI, l1_di},
372 {ST_L1_RESET, EV_PH_DC, l1_go_f3pdown},
373 {ST_L1_RESET, EV_PH_AR, l1_go_f6},
374 {ST_L1_RESET, EV_PH_AI8, l1_go_f7_act_ind},
375
376 {ST_L1_F3_PDOWN, EV_PH_RES, l1_di},
377 {ST_L1_F3_PDOWN, EV_PH_EI, l1_di},
378 {ST_L1_F3_PDOWN, EV_PH_AR, l1_go_f6},
379 {ST_L1_F3_PDOWN, EV_PH_RSY, l1_go_f5},
380 {ST_L1_F3_PDOWN, EV_PH_PU, l1_go_f4},
381 {ST_L1_F3_PDOWN, EV_PH_AI8, l1_go_f7_act_ind},
382 {ST_L1_F3_PDOWN, EV_PH_ACTIVATE_REQ, l1_ar8},
383 {ST_L1_F3_PDOWN, EV_TIMER3, l1_timer3},
384
385 {ST_L1_F3_PEND_DEACT, EV_PH_RES, l1_di},
386 {ST_L1_F3_PEND_DEACT, EV_PH_EI, l1_di},
387 {ST_L1_F3_PEND_DEACT, EV_PH_DC, l1_go_f3pdown},
388 {ST_L1_F3_PEND_DEACT, EV_PH_RSY, l1_go_f5},
389 {ST_L1_F3_PEND_DEACT, EV_PH_AR, l1_go_f6},
390 {ST_L1_F3_PEND_DEACT, EV_PH_AI8, l1_go_f7_act_ind},
391
392 {ST_L1_F4, EV_PH_RES, l1_di},
393 {ST_L1_F4, EV_PH_EI, l1_di},
394 {ST_L1_F4, EV_PH_RSY, l1_go_f5},
395 {ST_L1_F4, EV_PH_AI8, l1_go_f7_act_ind},
396 {ST_L1_F4, EV_TIMER3, l1_timer3},
397 {ST_L1_F4, EV_PH_DC, l1_go_f3pdown},
398
399 {ST_L1_F5, EV_PH_RES, l1_di},
400 {ST_L1_F5, EV_PH_EI, l1_di},
401 {ST_L1_F5, EV_PH_AR, l1_go_f6},
402 {ST_L1_F5, EV_PH_AI8, l1_go_f7_act_ind},
403 {ST_L1_F5, EV_TIMER3, l1_timer3},
404 {ST_L1_F5, EV_PH_DR, l1_go_f3pend},
405 {ST_L1_F5, EV_PH_DC, l1_go_f3pdown},
406
407 {ST_L1_F6, EV_PH_RES, l1_di},
408 {ST_L1_F6, EV_PH_EI, l1_di},
409 {ST_L1_F6, EV_PH_RSY, l1_go_f8},
410 {ST_L1_F6, EV_PH_AI8, l1_go_f7_act_ind},
411 {ST_L1_F6, EV_PH_DR6, l1_go_f3pend},
412 {ST_L1_F6, EV_TIMER3, l1_timer3},
413 {ST_L1_F6, EV_PH_DC, l1_go_f3pdown},
414
415 {ST_L1_F7, EV_PH_RES, l1_di_deact_ind},
416 {ST_L1_F7, EV_PH_EI, l1_di_deact_ind},
417 {ST_L1_F7, EV_PH_AR, l1_go_f6_deact_ind},
418 {ST_L1_F7, EV_PH_RSY, l1_go_f8_deact_ind},
419 {ST_L1_F7, EV_PH_DR, l1_go_f3pend_deact_ind},
420
421 {ST_L1_F8, EV_PH_RES, l1_di},
422 {ST_L1_F8, EV_PH_EI, l1_di},
423 {ST_L1_F8, EV_PH_AR, l1_go_f6},
424 {ST_L1_F8, EV_PH_DR, l1_go_f3pend},
425 {ST_L1_F8, EV_PH_AI8, l1_go_f7_act_ind},
426 {ST_L1_F8, EV_TIMER3, l1_timer3},
427 {ST_L1_F8, EV_PH_DC, l1_go_f3pdown},
428 };
429
430 static void l1m_debug(struct FsmInst *fi, char *fmt, ...)
431 {
432 va_list args;
433 char buf[256];
434
435 va_start(args, fmt);
436 vsnprintf(buf, sizeof(buf), fmt, args);
437 DBG(DBG_L1M, "%s", buf);
438 va_end(args);
439 }
440
441 static void isac_version(struct isac *cs)
442 {
443 int val;
444
445 val = cs->read_isac(cs, ISAC_RBCH);
446 DBG(1, "ISAC version (%x): %s", val, ISACVer[(val >> 5) & 3]);
447 }
448
449 static void isac_empty_fifo(struct isac *isac, int count)
450 {
451 // this also works for isacsx, since
452 // CMDR(D) register works the same
453 u_char *ptr;
454
455 DBG(DBG_IRQ, "count %d", count);
456
457 if ((isac->rcvidx + count) >= MAX_DFRAME_LEN_L1) {
458 DBG(DBG_WARN, "overrun %d", isac->rcvidx + count);
459 isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
460 isac->rcvidx = 0;
461 return;
462 }
463 ptr = isac->rcvbuf + isac->rcvidx;
464 isac->rcvidx += count;
465 isac->read_isac_fifo(isac, ptr, count);
466 isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
467 DBG_PACKET(DBG_RFIFO, ptr, count);
468 }
469
470 static void isac_fill_fifo(struct isac *isac)
471 {
472 // this also works for isacsx, since
473 // CMDR(D) register works the same
474
475 int count;
476 unsigned char cmd;
477 u_char *ptr;
478
479 BUG_ON(!isac->tx_skb);
480
481 count = isac->tx_skb->len;
482 BUG_ON(count <= 0);
483
484 DBG(DBG_IRQ, "count %d", count);
485
486 if (count > 0x20) {
487 count = 0x20;
488 cmd = ISAC_CMDR_XTF;
489 } else {
490 cmd = ISAC_CMDR_XTF | ISAC_CMDR_XME;
491 }
492
493 ptr = isac->tx_skb->data;
494 skb_pull(isac->tx_skb, count);
495 isac->tx_cnt += count;
496 DBG_PACKET(DBG_XFIFO, ptr, count);
497 isac->write_isac_fifo(isac, ptr, count);
498 isac->write_isac(isac, ISAC_CMDR, cmd);
499 }
500
501 static void isac_retransmit(struct isac *isac)
502 {
503 if (!isac->tx_skb) {
504 DBG(DBG_WARN, "no skb");
505 return;
506 }
507 skb_push(isac->tx_skb, isac->tx_cnt);
508 isac->tx_cnt = 0;
509 }
510
511
512 static inline void isac_cisq_interrupt(struct isac *isac)
513 {
514 unsigned char val;
515
516 val = isac->read_isac(isac, ISAC_CIR0);
517 DBG(DBG_IRQ, "CIR0 %#x", val);
518 if (val & ISAC_CIR0_CIC0) {
519 DBG(DBG_IRQ, "CODR0 %#x", (val >> 2) & 0xf);
520 FsmEvent(&isac->l1m, (val >> 2) & 0xf, NULL);
521 }
522 if (val & ISAC_CIR0_CIC1) {
523 val = isac->read_isac(isac, ISAC_CIR1);
524 DBG(DBG_WARN, "ISAC CIR1 %#x", val );
525 }
526 }
527
528 static inline void isac_rme_interrupt(struct isac *isac)
529 {
530 unsigned char val;
531 int count;
532 struct sk_buff *skb;
533
534 val = isac->read_isac(isac, ISAC_RSTA);
535 if ((val & (ISAC_RSTA_RDO | ISAC_RSTA_CRC | ISAC_RSTA_RAB) )
536 != ISAC_RSTA_CRC) {
537 DBG(DBG_WARN, "RSTA %#x, dropped", val);
538 isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
539 goto out;
540 }
541
542 count = isac->read_isac(isac, ISAC_RBCL) & 0x1f;
543 DBG(DBG_IRQ, "RBCL %#x", count);
544 if (count == 0)
545 count = 0x20;
546
547 isac_empty_fifo(isac, count);
548 count = isac->rcvidx;
549 if (count < 1) {
550 DBG(DBG_WARN, "count %d < 1", count);
551 goto out;
552 }
553
554 skb = alloc_skb(count, GFP_ATOMIC);
555 if (!skb) {
556 DBG(DBG_WARN, "no memory, dropping\n");
557 goto out;
558 }
559 memcpy(skb_put(skb, count), isac->rcvbuf, count);
560 DBG_SKB(DBG_RPACKET, skb);
561 D_L1L2(isac, PH_DATA | INDICATION, skb);
562 out:
563 isac->rcvidx = 0;
564 }
565
566 static inline void isac_xpr_interrupt(struct isac *isac)
567 {
568 if (!isac->tx_skb)
569 return;
570
571 if (isac->tx_skb->len > 0) {
572 isac_fill_fifo(isac);
573 return;
574 }
575 dev_kfree_skb_irq(isac->tx_skb);
576 isac->tx_cnt = 0;
577 isac->tx_skb = NULL;
578 D_L1L2(isac, PH_DATA | CONFIRM, NULL);
579 }
580
581 static inline void isac_exi_interrupt(struct isac *isac)
582 {
583 unsigned char val;
584
585 val = isac->read_isac(isac, ISAC_EXIR);
586 DBG(2, "EXIR %#x", val);
587
588 if (val & ISAC_EXIR_XMR) {
589 DBG(DBG_WARN, "ISAC XMR");
590 isac_retransmit(isac);
591 }
592 if (val & ISAC_EXIR_XDU) {
593 DBG(DBG_WARN, "ISAC XDU");
594 isac_retransmit(isac);
595 }
596 if (val & ISAC_EXIR_MOS) { /* MOS */
597 DBG(DBG_WARN, "MOS");
598 val = isac->read_isac(isac, ISAC_MOSR);
599 DBG(2, "ISAC MOSR %#x", val);
600 }
601 }
602
603 void isac_irq(struct isac *isac)
604 {
605 unsigned char val;
606
607 val = isac->read_isac(isac, ISAC_ISTA);
608 DBG(DBG_IRQ, "ISTA %#x", val);
609
610 if (val & ISAC_ISTA_EXI) {
611 DBG(DBG_IRQ, "EXI");
612 isac_exi_interrupt(isac);
613 }
614 if (val & ISAC_ISTA_XPR) {
615 DBG(DBG_IRQ, "XPR");
616 isac_xpr_interrupt(isac);
617 }
618 if (val & ISAC_ISTA_RME) {
619 DBG(DBG_IRQ, "RME");
620 isac_rme_interrupt(isac);
621 }
622 if (val & ISAC_ISTA_RPF) {
623 DBG(DBG_IRQ, "RPF");
624 isac_empty_fifo(isac, 0x20);
625 }
626 if (val & ISAC_ISTA_CISQ) {
627 DBG(DBG_IRQ, "CISQ");
628 isac_cisq_interrupt(isac);
629 }
630 if (val & ISAC_ISTA_RSC) {
631 DBG(DBG_WARN, "RSC");
632 }
633 if (val & ISAC_ISTA_SIN) {
634 DBG(DBG_WARN, "SIN");
635 }
636 isac->write_isac(isac, ISAC_MASK, 0xff);
637 isac->write_isac(isac, ISAC_MASK, 0x00);
638 }
639
640 // ======================================================================
641
642 static inline void isacsx_cic_interrupt(struct isac *isac)
643 {
644 unsigned char val;
645
646 val = isac->read_isac(isac, ISACSX_CIR0);
647 DBG(DBG_IRQ, "CIR0 %#x", val);
648 if (val & ISACSX_CIR0_CIC0) {
649 DBG(DBG_IRQ, "CODR0 %#x", val >> 4);
650 FsmEvent(&isac->l1m, val >> 4, NULL);
651 }
652 }
653
654 static inline void isacsx_rme_interrupt(struct isac *isac)
655 {
656 int count;
657 struct sk_buff *skb;
658 unsigned char val;
659
660 val = isac->read_isac(isac, ISACSX_RSTAD);
661 if ((val & (ISACSX_RSTAD_VFR |
662 ISACSX_RSTAD_RDO |
663 ISACSX_RSTAD_CRC |
664 ISACSX_RSTAD_RAB))
665 != (ISACSX_RSTAD_VFR | ISACSX_RSTAD_CRC)) {
666 DBG(DBG_WARN, "RSTAD %#x, dropped", val);
667 isac->write_isac(isac, ISACSX_CMDRD, ISACSX_CMDRD_RMC);
668 goto out;
669 }
670
671 count = isac->read_isac(isac, ISACSX_RBCLD) & 0x1f;
672 DBG(DBG_IRQ, "RBCLD %#x", count);
673 if (count == 0)
674 count = 0x20;
675
676 isac_empty_fifo(isac, count);
677 // strip trailing status byte
678 count = isac->rcvidx - 1;
679 if (count < 1) {
680 DBG(DBG_WARN, "count %d < 1", count);
681 goto out;
682 }
683
684 skb = dev_alloc_skb(count);
685 if (!skb) {
686 DBG(DBG_WARN, "no memory, dropping");
687 goto out;
688 }
689 memcpy(skb_put(skb, count), isac->rcvbuf, count);
690 DBG_SKB(DBG_RPACKET, skb);
691 D_L1L2(isac, PH_DATA | INDICATION, skb);
692 out:
693 isac->rcvidx = 0;
694 }
695
696 static inline void isacsx_xpr_interrupt(struct isac *isac)
697 {
698 if (!isac->tx_skb)
699 return;
700
701 if (isac->tx_skb->len > 0) {
702 isac_fill_fifo(isac);
703 return;
704 }
705 dev_kfree_skb_irq(isac->tx_skb);
706 isac->tx_skb = NULL;
707 isac->tx_cnt = 0;
708 D_L1L2(isac, PH_DATA | CONFIRM, NULL);
709 }
710
711 static inline void isacsx_icd_interrupt(struct isac *isac)
712 {
713 unsigned char val;
714
715 val = isac->read_isac(isac, ISACSX_ISTAD);
716 DBG(DBG_IRQ, "ISTAD %#x", val);
717 if (val & ISACSX_ISTAD_XDU) {
718 DBG(DBG_WARN, "ISTAD XDU");
719 isac_retransmit(isac);
720 }
721 if (val & ISACSX_ISTAD_XMR) {
722 DBG(DBG_WARN, "ISTAD XMR");
723 isac_retransmit(isac);
724 }
725 if (val & ISACSX_ISTAD_XPR) {
726 DBG(DBG_IRQ, "ISTAD XPR");
727 isacsx_xpr_interrupt(isac);
728 }
729 if (val & ISACSX_ISTAD_RFO) {
730 DBG(DBG_WARN, "ISTAD RFO");
731 isac->write_isac(isac, ISACSX_CMDRD, ISACSX_CMDRD_RMC);
732 }
733 if (val & ISACSX_ISTAD_RME) {
734 DBG(DBG_IRQ, "ISTAD RME");
735 isacsx_rme_interrupt(isac);
736 }
737 if (val & ISACSX_ISTAD_RPF) {
738 DBG(DBG_IRQ, "ISTAD RPF");
739 isac_empty_fifo(isac, 0x20);
740 }
741 }
742
743 void isacsx_irq(struct isac *isac)
744 {
745 unsigned char val;
746
747 val = isac->read_isac(isac, ISACSX_ISTA);
748 DBG(DBG_IRQ, "ISTA %#x", val);
749
750 if (val & ISACSX_ISTA_ICD)
751 isacsx_icd_interrupt(isac);
752 if (val & ISACSX_ISTA_CIC)
753 isacsx_cic_interrupt(isac);
754 }
755
756 void isac_init(struct isac *isac)
757 {
758 isac->tx_skb = NULL;
759 isac->l1m.fsm = &l1fsm;
760 isac->l1m.state = ST_L1_RESET;
761 #ifdef CONFIG_HISAX_DEBUG
762 isac->l1m.debug = 1;
763 #else
764 isac->l1m.debug = 0;
765 #endif
766 isac->l1m.userdata = isac;
767 isac->l1m.printdebug = l1m_debug;
768 FsmInitTimer(&isac->l1m, &isac->timer);
769 }
770
771 void isac_setup(struct isac *isac)
772 {
773 int val, eval;
774
775 isac->type = TYPE_ISAC;
776 isac_version(isac);
777
778 ph_command(isac, ISAC_CMD_RES);
779
780 isac->write_isac(isac, ISAC_MASK, 0xff);
781 isac->mocr = 0xaa;
782 if (test_bit(ISAC_IOM1, &isac->flags)) {
783 /* IOM 1 Mode */
784 isac->write_isac(isac, ISAC_ADF2, 0x0);
785 isac->write_isac(isac, ISAC_SPCR, 0xa);
786 isac->write_isac(isac, ISAC_ADF1, 0x2);
787 isac->write_isac(isac, ISAC_STCR, 0x70);
788 isac->write_isac(isac, ISAC_MODE, 0xc9);
789 } else {
790 /* IOM 2 Mode */
791 if (!isac->adf2)
792 isac->adf2 = 0x80;
793 isac->write_isac(isac, ISAC_ADF2, isac->adf2);
794 isac->write_isac(isac, ISAC_SQXR, 0x2f);
795 isac->write_isac(isac, ISAC_SPCR, 0x00);
796 isac->write_isac(isac, ISAC_STCR, 0x70);
797 isac->write_isac(isac, ISAC_MODE, 0xc9);
798 isac->write_isac(isac, ISAC_TIMR, 0x00);
799 isac->write_isac(isac, ISAC_ADF1, 0x00);
800 }
801 val = isac->read_isac(isac, ISAC_STAR);
802 DBG(2, "ISAC STAR %x", val);
803 val = isac->read_isac(isac, ISAC_MODE);
804 DBG(2, "ISAC MODE %x", val);
805 val = isac->read_isac(isac, ISAC_ADF2);
806 DBG(2, "ISAC ADF2 %x", val);
807 val = isac->read_isac(isac, ISAC_ISTA);
808 DBG(2, "ISAC ISTA %x", val);
809 if (val & 0x01) {
810 eval = isac->read_isac(isac, ISAC_EXIR);
811 DBG(2, "ISAC EXIR %x", eval);
812 }
813 val = isac->read_isac(isac, ISAC_CIR0);
814 DBG(2, "ISAC CIR0 %x", val);
815 FsmEvent(&isac->l1m, (val >> 2) & 0xf, NULL);
816
817 isac->write_isac(isac, ISAC_MASK, 0x0);
818 // RESET Receiver and Transmitter
819 isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_XRES | ISAC_CMDR_RRES);
820 }
821
822 void isacsx_setup(struct isac *isac)
823 {
824 isac->type = TYPE_ISACSX;
825 // clear LDD
826 isac->write_isac(isac, ISACSX_TR_CONF0, 0x00);
827 // enable transmitter
828 isac->write_isac(isac, ISACSX_TR_CONF2, 0x00);
829 // transparent mode 0, RAC, stop/go
830 isac->write_isac(isac, ISACSX_MODED, 0xc9);
831 // all HDLC IRQ unmasked
832 isac->write_isac(isac, ISACSX_MASKD, 0x03);
833 // unmask ICD, CID IRQs
834 isac->write_isac(isac, ISACSX_MASK,
835 ~(ISACSX_ISTA_ICD | ISACSX_ISTA_CIC));
836 }
837
838 void isac_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg)
839 {
840 struct isac *isac = hisax_d_if->priv;
841 struct sk_buff *skb = arg;
842
843 DBG(DBG_PR, "pr %#x", pr);
844
845 switch (pr) {
846 case PH_ACTIVATE | REQUEST:
847 FsmEvent(&isac->l1m, EV_PH_ACTIVATE_REQ, NULL);
848 break;
849 case PH_DEACTIVATE | REQUEST:
850 FsmEvent(&isac->l1m, EV_PH_DEACTIVATE_REQ, NULL);
851 break;
852 case PH_DATA | REQUEST:
853 DBG(DBG_PR, "PH_DATA REQUEST len %d", skb->len);
854 DBG_SKB(DBG_XPACKET, skb);
855 if (isac->l1m.state != ST_L1_F7) {
856 DBG(1, "L1 wrong state %d\n", isac->l1m.state);
857 dev_kfree_skb(skb);
858 break;
859 }
860 BUG_ON(isac->tx_skb);
861
862 isac->tx_skb = skb;
863 isac_fill_fifo(isac);
864 break;
865 }
866 }
867
868 static int __init hisax_isac_init(void)
869 {
870 printk(KERN_INFO "hisax_isac: ISAC-S/ISAC-SX ISDN driver v0.1.0\n");
871
872 l1fsm.state_count = L1_STATE_COUNT;
873 l1fsm.event_count = L1_EVENT_COUNT;
874 l1fsm.strState = strL1State;
875 l1fsm.strEvent = strL1Event;
876 return FsmNew(&l1fsm, L1FnList, ARRAY_SIZE(L1FnList));
877 }
878
879 static void __exit hisax_isac_exit(void)
880 {
881 FsmFree(&l1fsm);
882 }
883
884 EXPORT_SYMBOL(isac_init);
885 EXPORT_SYMBOL(isac_d_l2l1);
886
887 EXPORT_SYMBOL(isacsx_setup);
888 EXPORT_SYMBOL(isacsx_irq);
889
890 EXPORT_SYMBOL(isac_setup);
891 EXPORT_SYMBOL(isac_irq);
892
893 module_init(hisax_isac_init);
894 module_exit(hisax_isac_exit);
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