aboutsummaryrefslogtreecommitdiff
path: root/drivers/isdn/hisax/elsa_ser.c
blob: 1657bba7879ee9c5ca8242b6f20864f49bd16a2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
/* $Id: elsa_ser.c,v 2.14.2.3 2004/02/11 13:21:33 keil Exp $
 *
 * stuff for the serial modem on ELSA cards
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/serial.h>
#include <linux/serial_reg.h>

#define MAX_MODEM_BUF	256
#define WAKEUP_CHARS	(MAX_MODEM_BUF/2)
#define RS_ISR_PASS_LIMIT 256
#define BASE_BAUD ( 1843200 / 16 )

//#define SERIAL_DEBUG_OPEN 1
//#define SERIAL_DEBUG_INTR 1
//#define SERIAL_DEBUG_FLOW 1
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_REG
//#define SERIAL_DEBUG_REG 1

#ifdef SERIAL_DEBUG_REG
static u_char deb[32];
const char *ModemIn[] = {"RBR","IER","IIR","LCR","MCR","LSR","MSR","SCR"};
const char *ModemOut[] = {"THR","IER","FCR","LCR","MCR","LSR","MSR","SCR"};
#endif

static char *MInit_1 = "AT&F&C1E0&D2\r\0";
static char *MInit_2 = "ATL2M1S64=13\r\0";
static char *MInit_3 = "AT+FCLASS=0\r\0";
static char *MInit_4 = "ATV1S2=128X1\r\0";
static char *MInit_5 = "AT\\V8\\N3\r\0";
static char *MInit_6 = "ATL0M0&G0%E1\r\0";
static char *MInit_7 = "AT%L1%M0%C3\r\0";

static char *MInit_speed28800 = "AT%G0%B28800\r\0";

static char *MInit_dialout = "ATs7=60 x1 d\r\0";
static char *MInit_dialin = "ATs7=60 x1 a\r\0";


static inline unsigned int serial_in(struct IsdnCardState *cs, int offset)
{
#ifdef SERIAL_DEBUG_REG
	u_int val = inb(cs->hw.elsa.base + 8 + offset);
	debugl1(cs,"in   %s %02x",ModemIn[offset], val);
	return(val);
#else
	return inb(cs->hw.elsa.base + 8 + offset);
#endif
}

static inline unsigned int serial_inp(struct IsdnCardState *cs, int offset)
{
#ifdef SERIAL_DEBUG_REG
#ifdef ELSA_SERIAL_NOPAUSE_IO
	u_int val = inb(cs->hw.elsa.base + 8 + offset);
	debugl1(cs,"inp  %s %02x",ModemIn[offset], val);
#else
	u_int val = inb_p(cs->hw.elsa.base + 8 + offset);
	debugl1(cs,"inP  %s %02x",ModemIn[offset], val);
#endif
	return(val);
#else
#ifdef ELSA_SERIAL_NOPAUSE_IO
	return inb(cs->hw.elsa.base + 8 + offset);
#else
	return inb_p(cs->hw.elsa.base + 8 + offset);
#endif
#endif
}

static inline void serial_out(struct IsdnCardState *cs, int offset, int value)
{
#ifdef SERIAL_DEBUG_REG
	debugl1(cs,"out  %s %02x",ModemOut[offset], value);
#endif
	outb(value, cs->hw.elsa.base + 8 + offset);
}

static inline void serial_outp(struct IsdnCardState *cs, int offset,
			       int value)
{
#ifdef SERIAL_DEBUG_REG
#ifdef ELSA_SERIAL_NOPAUSE_IO
	debugl1(cs,"outp %s %02x",ModemOut[offset], value);
#else
	debugl1(cs,"outP %s %02x",ModemOut[offset], value);
#endif
#endif
#ifdef ELSA_SERIAL_NOPAUSE_IO
	outb(value, cs->hw.elsa.base + 8 + offset);
#else
    	outb_p(value, cs->hw.elsa.base + 8 + offset);
#endif
}

/*
 * This routine is called to set the UART divisor registers to match
 * the specified baud rate for a serial port.
 */
static void change_speed(struct IsdnCardState *cs, int baud)
{
	int	quot = 0, baud_base;
	unsigned cval, fcr = 0;
	int	bits;


	/* byte size and parity */
	cval = 0x03; bits = 10;
	/* Determine divisor based on baud rate */
	baud_base = BASE_BAUD;
	quot = baud_base / baud;
	/* If the quotient is ever zero, default to 9600 bps */
	if (!quot)
		quot = baud_base / 9600;

	/* Set up FIFO's */
	if ((baud_base / quot) < 2400)
		fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
	else
		fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
	serial_outp(cs, UART_FCR, fcr);
	/* CTS flow control flag and modem status interrupts */
	cs->hw.elsa.IER &= ~UART_IER_MSI;
	cs->hw.elsa.IER |= UART_IER_MSI;
	serial_outp(cs, UART_IER, cs->hw.elsa.IER);

	debugl1(cs,"modem quot=0x%x", quot);
	serial_outp(cs, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
	serial_outp(cs, UART_DLL, quot & 0xff);		/* LS of divisor */
	serial_outp(cs, UART_DLM, quot >> 8);		/* MS of divisor */
	serial_outp(cs, UART_LCR, cval);		/* reset DLAB */
	serial_inp(cs, UART_RX);
}

static int mstartup(struct IsdnCardState *cs)
{
	int	retval=0;

	/*
	 * Clear the FIFO buffers and disable them
	 * (they will be reenabled in change_speed())
	 */
	serial_outp(cs, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT));

	/*
	 * At this point there's no way the LSR could still be 0xFF;
	 * if it is, then bail out, because there's likely no UART
	 * here.
	 */
	if (serial_inp(cs, UART_LSR) == 0xff) {
		retval = -ENODEV;
		goto errout;
	}
	
	/*
	 * Clear the interrupt registers.
	 */
	(void) serial_inp(cs, UART_RX);
	(void) serial_inp(cs, UART_IIR);
	(void) serial_inp(cs, UART_MSR);

	/*
	 * Now, initialize the UART 
	 */
	serial_outp(cs, UART_LCR, UART_LCR_WLEN8);	/* reset DLAB */

	cs->hw.elsa.MCR = 0;
	cs->hw.elsa.MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
	serial_outp(cs, UART_MCR, cs->hw.elsa.MCR);
	
	/*
	 * Finally, enable interrupts
	 */
	cs->hw.elsa.IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
	serial_outp(cs, UART_IER, cs->hw.elsa.IER);	/* enable interrupts */
	
	/*
	 * And clear the interrupt registers again for luck.
	 */
	(void)serial_inp(cs, UART_LSR);
	(void)serial_inp(cs, UART_RX);
	(void)serial_inp(cs, UART_IIR);
	(void)serial_inp(cs, UART_MSR);

	cs->hw.elsa.transcnt = cs->hw.elsa.transp = 0;
	cs->hw.elsa.rcvcnt = cs->hw.elsa.rcvp =0;

	/*
	 * and set the speed of the serial port
	 */
	change_speed(cs, BASE_BAUD);
	cs->hw.elsa.MFlag = 1;
errout:
	return retval;
}

/*
 * This routine will shutdown a serial port; interrupts are disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void mshutdown(struct IsdnCardState *cs)
{

#ifdef SERIAL_DEBUG_OPEN
	printk(KERN_DEBUG"Shutting down serial ....");
#endif
	
	/*
	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
	 * here so the queue might never be waken up
	 */

	cs->hw.elsa.IER = 0;
	serial_outp(cs, UART_IER, 0x00);	/* disable all intrs */
	cs->hw.elsa.MCR &= ~UART_MCR_OUT2;
	
	/* disable break condition */
	serial_outp(cs, UART_LCR, serial_inp(cs, UART_LCR) & ~UART_LCR_SBC);
	
	cs->hw.elsa.MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
	serial_outp(cs, UART_MCR, cs->hw.elsa.MCR);

	/* disable FIFO's */	
	serial_outp(cs, UART_FCR, (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT));
	serial_inp(cs, UART_RX);    /* read data port to reset things */
	
#ifdef SERIAL_DEBUG_OPEN
	printk(" done\n");
#endif
}

static inline int
write_modem(struct BCState *bcs) {
	int ret=0;
	struct IsdnCardState *cs = bcs->cs;
	int count, len, fp;
	
	if (!bcs->tx_skb)
		return 0;
	if (bcs->tx_skb->len <= 0)
		return 0;
	len = bcs->tx_skb->len;
	if (len > MAX_MODEM_BUF - cs->hw.elsa.transcnt)
		len = MAX_MODEM_BUF - cs->hw.elsa.transcnt;
	fp = cs->hw.elsa.transcnt + cs->hw.elsa.transp;
	fp &= (MAX_MODEM_BUF -1);
	count = len;
	if (count > MAX_MODEM_BUF - fp) {
		count = MAX_MODEM_BUF - fp;
		skb_copy_from_linear_data(bcs->tx_skb,
					  cs->hw.elsa.transbuf + fp, count);
		skb_pull(bcs->tx_skb, count);
		cs->hw.elsa.transcnt += count;
		ret = count;
		count = len - count;
		fp = 0;
	}
	skb_copy_from_linear_data(bcs->tx_skb,
				  cs->hw.elsa.transbuf + fp, count);
	skb_pull(bcs->tx_skb, count);
	cs->hw.elsa.transcnt += count;
	ret += count;
	
	if (cs->hw.elsa.transcnt && 
	    !(cs->hw.elsa.IER & UART_IER_THRI)) {
			cs->hw.elsa.IER |= UART_IER_THRI;
		serial_outp(cs, UART_IER, cs->hw.elsa.IER);
	}
	return(ret);
}

static inline void
modem_fill(struct BCState *bcs) {
		
	if (bcs->tx_skb) {
		if (bcs->tx_skb->len) {
			write_modem(bcs);
			return;
		} else {
			if (test_bit(FLG_LLI_L1WAKEUP,&bcs->st->lli.flag) &&
				(PACKET_NOACK != bcs->tx_skb->pkt_type)) {
				u_long	flags;
				spin_lock_irqsave(&bcs->aclock, flags);
				bcs->ackcnt += bcs->hw.hscx.count;
				spin_unlock_irqrestore(&bcs->aclock, flags);
				schedule_event(bcs, B_ACKPENDING);
			}
			dev_kfree_skb_any(bcs->tx_skb);
			bcs->tx_skb = NULL;
		}
	}
	if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
		bcs->hw.hscx.count = 0;
		test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
		write_modem(bcs);
	} else {
		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
		schedule_event(bcs, B_XMTBUFREADY);
	}
}

static inline void receive_chars(struct IsdnCardState *cs,
				 int *status)
{
	unsigned char ch;
	struct sk_buff *skb;

	do {
		ch = serial_in(cs, UART_RX);
		if (cs->hw.elsa.rcvcnt >= MAX_MODEM_BUF)
			break;
		cs->hw.elsa.rcvbuf[cs->hw.elsa.rcvcnt++] = ch;
#ifdef SERIAL_DEBUG_INTR
		printk("DR%02x:%02x...", ch, *status);
#endif
		if (*status & (UART_LSR_BI | UART_LSR_PE |
			       UART_LSR_FE | UART_LSR_OE)) {
					
#ifdef SERIAL_DEBUG_INTR
			printk("handling exept....");
#endif
		}
		*status = serial_inp(cs, UART_LSR);
	} while (*status & UART_LSR_DR);
	if (cs->hw.elsa.MFlag == 2) {
		if (!(skb = dev_alloc_skb(cs->hw.elsa.rcvcnt)))
			printk(KERN_WARNING "ElsaSER: receive out of memory\n");
		else {
			memcpy(skb_put(skb, cs->hw.elsa.rcvcnt), cs->hw.elsa.rcvbuf, 
				cs->hw.elsa.rcvcnt);
			skb_queue_tail(& cs->hw.elsa.bcs->rqueue, skb);
		}
		schedule_event(cs->hw.elsa.bcs, B_RCVBUFREADY);
	} else {
		char tmp[128];
		char *t = tmp;

		t += sprintf(t, "modem read cnt %d", cs->hw.elsa.rcvcnt);
		QuickHex(t, cs->hw.elsa.rcvbuf, cs->hw.elsa.rcvcnt);
		debugl1(cs, tmp);
	}
	cs->hw.elsa.rcvcnt = 0;
}

static inline void transmit_chars(struct IsdnCardState *cs, int *intr_done)
{
	int count;
	
	debugl1(cs, "transmit_chars: p(%x) cnt(%x)", cs->hw.elsa.transp, 
		cs->hw.elsa.transcnt);
	
	if (cs->hw.elsa.transcnt <= 0) {
		cs->hw.elsa.IER &= ~UART_IER_THRI;
		serial_out(cs, UART_IER, cs->hw.elsa.IER);
		return;
	}
	count = 16;
	do {
		serial_outp(cs, UART_TX, cs->hw.elsa.transbuf[cs->hw.elsa.transp++]);
		if (cs->hw.elsa.transp >= MAX_MODEM_BUF)
			cs->hw.elsa.transp=0;
		if (--cs->hw.elsa.transcnt <= 0)
			break;
	} while (--count > 0);
	if ((cs->hw.elsa.transcnt < WAKEUP_CHARS) && (cs->hw.elsa.MFlag==2))
		modem_fill(cs->hw.elsa.bcs);

#ifdef SERIAL_DEBUG_INTR
	printk("THRE...");
#endif
	if (intr_done)
		*intr_done = 0;
	if (cs->hw.elsa.transcnt <= 0) {
		cs->hw.elsa.IER &= ~UART_IER_THRI;
		serial_outp(cs, UART_IER, cs->hw.elsa.IER);
	}
}


static void rs_interrupt_elsa(struct IsdnCardState *cs)
{
	int status, iir, msr;
	int pass_counter = 0;
	
#ifdef SERIAL_DEBUG_INTR
	printk(KERN_DEBUG "rs_interrupt_single(%d)...", cs->irq);
#endif

	do {
		status = serial_inp(cs, UART_LSR);
		debugl1(cs,"rs LSR %02x", status);
#ifdef SERIAL_DEBUG_INTR
		printk("status = %x...", status);
#endif
		if (status & UART_LSR_DR)
			receive_chars(cs, &status);
		if (status & UART_LSR_THRE)
			transmit_chars(cs, NULL);
		if (pass_counter++ > RS_ISR_PASS_LIMIT) {
			printk("rs_single loop break.\n");
			break;
		}
		iir = serial_inp(cs, UART_IIR);
		debugl1(cs,"rs IIR %02x", iir);
		if ((iir & 0xf) == 0) {
			msr = serial_inp(cs, UART_MSR);
			debugl1(cs,"rs MSR %02x", msr);
		}
	} while (!(iir & UART_IIR_NO_INT));
#ifdef SERIAL_DEBUG_INTR
	printk("end.\n");
#endif
}

extern int open_hscxstate(struct IsdnCardState *cs, struct BCState *bcs);
extern void modehscx(struct BCState *bcs, int mode, int bc);
extern void hscx_l2l1(struct PStack *st, int pr, void *arg);

static void
close_elsastate(struct BCState *bcs)
{
	modehscx(bcs, 0, bcs->channel);
	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
		if (bcs->hw.hscx.rcvbuf) {
			if (bcs->mode != L1_MODE_MODEM)
				kfree(bcs->hw.hscx.rcvbuf);
			bcs->hw.hscx.rcvbuf = NULL;
		}
		skb_queue_purge(&bcs->rqueue);
		skb_queue_purge(&bcs->squeue);
		if (bcs->tx_skb) {
			dev_kfree_skb_any(bcs->tx_skb);
			bcs->tx_skb = NULL;
			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
		}
	}
}

static void
modem_write_cmd(struct IsdnCardState *cs, u_char *buf, int len) {
	int count, fp;
	u_char *msg = buf;
	
	if (!len)
		return;
	if (len > (MAX_MODEM_BUF - cs->hw.elsa.transcnt)) {
		return;
	}
	fp = cs->hw.elsa.transcnt + cs->hw.elsa.transp;
	fp &= (MAX_MODEM_BUF -1);
	count = len;
	if (count > MAX_MODEM_BUF - fp) {
		count = MAX_MODEM_BUF - fp;
		memcpy(cs->hw.elsa.transbuf + fp, msg, count);
		cs->hw.elsa.transcnt += count;
		msg += count;
		count = len - count;
		fp = 0;
	}
	memcpy(cs->hw.elsa.transbuf + fp, msg, count);
	cs->hw.elsa.transcnt += count;
	if (cs->hw.elsa.transcnt && 
	    !(cs->hw.elsa.IER & UART_IER_THRI)) {
		cs->hw.elsa.IER |= UART_IER_THRI;
		serial_outp(cs, UART_IER, cs->hw.elsa.IER);
	}
}

static void
modem_set_init(struct IsdnCardState *cs) {
	int timeout;

#define RCV_DELAY 20
	modem_write_cmd(cs, MInit_1, strlen(MInit_1));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	modem_write_cmd(cs, MInit_2, strlen(MInit_2));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	modem_write_cmd(cs, MInit_3, strlen(MInit_3));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	modem_write_cmd(cs, MInit_4, strlen(MInit_4));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	modem_write_cmd(cs, MInit_5, strlen(MInit_5));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	modem_write_cmd(cs, MInit_6, strlen(MInit_6));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	modem_write_cmd(cs, MInit_7, strlen(MInit_7));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
}

static void
modem_set_dial(struct IsdnCardState *cs, int outgoing) {
	int timeout;
#define RCV_DELAY 20

	modem_write_cmd(cs, MInit_speed28800, strlen(MInit_speed28800));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
	if (outgoing)
		modem_write_cmd(cs, MInit_dialout, strlen(MInit_dialout));
	else
		modem_write_cmd(cs, MInit_dialin, strlen(MInit_dialin));
	timeout = 1000;
	while(timeout-- && cs->hw.elsa.transcnt)
		udelay(1000);
	debugl1(cs, "msi tout=%d", timeout);
	mdelay(RCV_DELAY);
}

static void
modem_l2l1(struct PStack *st, int pr, void *arg)
{
	struct BCState *bcs = st->l1.bcs;
	struct sk_buff *skb = arg;
	u_long flags;

	if (pr == (PH_DATA | REQUEST)) {
		spin_lock_irqsave(&bcs->cs->lock, flags);
		if (bcs->tx_skb) {
			skb_queue_tail(&bcs->squeue, skb);
		} else {
			bcs->tx_skb = skb;
			test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
			bcs->hw.hscx.count = 0;
			write_modem(bcs);
		}
		spin_unlock_irqrestore(&bcs->cs->lock, flags);
	} else if (pr == (PH_ACTIVATE | REQUEST)) {
		test_and_set_bit(BC_FLG_ACTIV, &bcs->Flag);
		st->l1.l1l2(st, PH_ACTIVATE | CONFIRM, NULL);
		set_arcofi(bcs->cs, st->l1.bc);
		mstartup(bcs->cs);
		modem_set_dial(bcs->cs, test_bit(FLG_ORIG, &st->l2.flag));
		bcs->cs->hw.elsa.MFlag=2;
	} else if (pr == (PH_DEACTIVATE | REQUEST)) {
		test_and_clear_bit(BC_FLG_ACTIV, &bcs->Flag);
		bcs->cs->dc.isac.arcofi_bc = st->l1.bc;
		arcofi_fsm(bcs->cs, ARCOFI_START, &ARCOFI_XOP_0);
		interruptible_sleep_on(&bcs->cs->dc.isac.arcofi_wait);
		bcs->cs->hw.elsa.MFlag=1;
	} else {
		printk(KERN_WARNING"ElsaSer: unknown pr %x\n", pr);
	}
}

static int
setstack_elsa(struct PStack *st, struct BCState *bcs)
{

	bcs->channel = st->l1.bc;
	switch (st->l1.mode) {
		case L1_MODE_HDLC:
		case L1_MODE_TRANS:
			if (open_hscxstate(st->l1.hardware, bcs))
				return (-1);
			st->l2.l2l1 = hscx_l2l1;
			break;
		case L1_MODE_MODEM:
			bcs->mode = L1_MODE_MODEM;
			if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
				bcs->hw.hscx.rcvbuf = bcs->cs->hw.elsa.rcvbuf;
				skb_queue_head_init(&bcs->rqueue);
				skb_queue_head_init(&bcs->squeue);
			}
			bcs->tx_skb = NULL;
			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
			bcs->event = 0;
			bcs->hw.hscx.rcvidx = 0;
			bcs->tx_cnt = 0;
			bcs->cs->hw.elsa.bcs = bcs;
			st->l2.l2l1 = modem_l2l1;
			break;
	}
	st->l1.bcs = bcs;
	setstack_manager(st);
	bcs->st = st;
	setstack_l1_B(st);
	return (0);
}

static void
init_modem(struct IsdnCardState *cs) {

	cs->bcs[0].BC_SetStack = setstack_elsa;
	cs->bcs[1].BC_SetStack = setstack_elsa;
	cs->bcs[0].BC_Close = close_elsastate;
	cs->bcs[1].BC_Close = close_elsastate;
	if (!(cs->hw.elsa.rcvbuf = kmalloc(MAX_MODEM_BUF,
		GFP_ATOMIC))) {
		printk(KERN_WARNING
			"Elsa: No modem mem hw.elsa.rcvbuf\n");
		return;
	}
	if (!(cs->hw.elsa.transbuf = kmalloc(MAX_MODEM_BUF,
		GFP_ATOMIC))) {
		printk(KERN_WARNING
			"Elsa: No modem mem hw.elsa.transbuf\n");
		kfree(cs->hw.elsa.rcvbuf);
		cs->hw.elsa.rcvbuf = NULL;
		return;
	}
	if (mstartup(cs)) {
		printk(KERN_WARNING "Elsa: problem startup modem\n");
	}
	modem_set_init(cs);
}

static void
release_modem(struct IsdnCardState *cs) {

	cs->hw.elsa.MFlag = 0;
	if (cs->hw.elsa.transbuf) {
		if (cs->hw.elsa.rcvbuf) {
			mshutdown(cs);
			kfree(cs->hw.elsa.rcvbuf);
			cs->hw.elsa.rcvbuf = NULL;
		}
		kfree(cs->hw.elsa.transbuf);
		cs->hw.elsa.transbuf = NULL;
	}
}