aboutsummaryrefslogtreecommitdiff
path: root/drivers/isdn/sc/init.c
blob: 06c9872e8c6a5c5b503117d86fdd05dbd3286e65 (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
/*
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include "includes.h"
#include "hardware.h"
#include "card.h"

MODULE_DESCRIPTION("ISDN4Linux: Driver for Spellcaster card");
MODULE_AUTHOR("Spellcaster Telecommunications Inc.");
MODULE_LICENSE("GPL");

board *sc_adapter[MAX_CARDS];
int cinst;

static char devname[] = "scX";
static const char version[] = "2.0b1";

static const char *boardname[] = { "DataCommute/BRI", "DataCommute/PRI", "TeleCommute/BRI" };

/* insmod set parameters */
static unsigned int io[] = {0,0,0,0};
static unsigned char irq[] = {0,0,0,0};
static unsigned long ram[] = {0,0,0,0};
static int do_reset = 0;

module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(ram, int, NULL, 0);
module_param(do_reset, bool, 0);

extern irqreturn_t interrupt_handler(int, void *);
extern int sndpkt(int, int, int, struct sk_buff *);
extern int command(isdn_ctrl *);
extern int indicate_status(int, int, ulong, char*);
extern int reset(int);

static int identify_board(unsigned long, unsigned int);

static int __init sc_init(void)
{
	int b = -1;
	int i, j;
	int status = -ENODEV;

	unsigned long memsize = 0;
	unsigned long features = 0;
	isdn_if *interface;
	unsigned char channels;
	unsigned char pgport;
	unsigned long magic;
	int model;
	int last_base = IOBASE_MIN;
	int probe_exhasted = 0;

#ifdef MODULE
	pr_info("SpellCaster ISA ISDN Adapter Driver rev. %s Loaded\n", version);
#else
	pr_info("SpellCaster ISA ISDN Adapter Driver rev. %s\n", version);
#endif
	pr_info("Copyright (C) 1996 SpellCaster Telecommunications Inc.\n");

	while(b++ < MAX_CARDS - 1) {
		pr_debug("Probing for adapter #%d\n", b);
		/*
		 * Initialize reusable variables
		 */
		model = -1;
		magic = 0;
		channels = 0;
		pgport = 0;

		/* 
		 * See if we should probe for IO base 
		 */
		pr_debug("I/O Base for board %d is 0x%x, %s probe\n", b, io[b],
			io[b] == 0 ? "will" : "won't");
		if(io[b]) {
			/*
			 * No, I/O Base has been provided
			 */
			for (i = 0 ; i < MAX_IO_REGS - 1 ; i++) {
				if(!request_region(io[b] + i * 0x400, 1, "sc test")) {
					pr_debug("request_region for 0x%x failed\n", io[b] + i * 0x400);
					io[b] = 0;
					break;
				} else
					release_region(io[b] + i * 0x400, 1);
			}

			/*
			 * Confirm the I/O Address with a test
			 */
			if(io[b] == 0) {
				pr_debug("I/O Address invalid.\n");
				continue;
			}

			outb(0x18, io[b] + 0x400 * EXP_PAGE0);
			if(inb(io[b] + 0x400 * EXP_PAGE0) != 0x18) {
				pr_debug("I/O Base 0x%x fails test\n",
					 io[b] + 0x400 * EXP_PAGE0);
				continue;
			}
		}
		else {
			/*
			 * Yes, probe for I/O Base
			 */
			if(probe_exhasted) {
				pr_debug("All probe addresses exhasted, skipping\n");
				continue;
			}
			pr_debug("Probing for I/O...\n");
			for (i = last_base ; i <= IOBASE_MAX ; i += IOBASE_OFFSET) {
				int found_io = 1;
				if (i == IOBASE_MAX) {
					probe_exhasted = 1; /* No more addresses to probe */
					pr_debug("End of Probes\n");
				}
				last_base = i + IOBASE_OFFSET;
				pr_debug("  checking 0x%x...", i);
				for ( j = 0 ; j < MAX_IO_REGS - 1 ; j++) {
					if(!request_region(i + j * 0x400, 1, "sc test")) {
						pr_debug("Failed\n");
						found_io = 0;
						break;
					} else
						release_region(i + j * 0x400, 1);
				}	

				if(found_io) {
					io[b] = i;
					outb(0x18, io[b] + 0x400 * EXP_PAGE0);
					if(inb(io[b] + 0x400 * EXP_PAGE0) != 0x18) { 
						pr_debug("Failed by test\n");
						continue;
					}
					pr_debug("Passed\n");
					break;
				}
			}
			if(probe_exhasted) {
				continue;
			}
		}

		/*
		 * See if we should probe for shared RAM
		 */
		if(do_reset) {
			pr_debug("Doing a SAFE probe reset\n");
			outb(0xFF, io[b] + RESET_OFFSET);
			msleep_interruptible(10000);
		}
		pr_debug("RAM Base for board %d is 0x%lx, %s probe\n", b,
			ram[b], ram[b] == 0 ? "will" : "won't");

		if(ram[b]) {
			/*
			 * No, the RAM base has been provided
			 * Just look for a signature and ID the
			 * board model
			 */
			if(request_region(ram[b], SRAM_PAGESIZE, "sc test")) {
				pr_debug("request_region for RAM base 0x%lx succeeded\n", ram[b]);
			 	model = identify_board(ram[b], io[b]);
				release_region(ram[b], SRAM_PAGESIZE);
			}
		}
		else {
			/*
			 * Yes, probe for free RAM and look for
			 * a signature and id the board model
			 */
			for (i = SRAM_MIN ; i < SRAM_MAX ; i += SRAM_PAGESIZE) {
				pr_debug("Checking RAM address 0x%x...\n", i);
				if(request_region(i, SRAM_PAGESIZE, "sc test")) {
					pr_debug("  request_region succeeded\n");
					model = identify_board(i, io[b]);
					release_region(i, SRAM_PAGESIZE);
					if (model >= 0) {
						pr_debug("  Identified a %s\n",
							boardname[model]);
						ram[b] = i;
						break;
					}
					pr_debug("  Unidentifed or inaccessible\n");
					continue;
				}
				pr_debug("  request failed\n");
			}
		}
		/*
		 * See if we found free RAM and the board model
		 */
		if(!ram[b] || model < 0) {
			/*
			 * Nope, there was no place in RAM for the
			 * board, or it couldn't be identified
			 */
			 pr_debug("Failed to find an adapter at 0x%lx\n", ram[b]);
			 continue;
		}

		/*
		 * Set the board's magic number, memory size and page register
		 */
		switch(model) {
		case PRI_BOARD:
			channels = 23;
			magic = 0x20000;
			memsize = 0x100000;
			features = PRI_FEATURES;
			break;

		case BRI_BOARD:
		case POTS_BOARD:
			channels = 2;
			magic = 0x60000;
			memsize = 0x10000;
			features = BRI_FEATURES;
			break;
		}
		switch(ram[b] >> 12 & 0x0F) {
		case 0x0:
			pr_debug("RAM Page register set to EXP_PAGE0\n");
			pgport = EXP_PAGE0;
			break;

		case 0x4:
			pr_debug("RAM Page register set to EXP_PAGE1\n");
			pgport = EXP_PAGE1;
			break;

		case 0x8:
			pr_debug("RAM Page register set to EXP_PAGE2\n");
			pgport = EXP_PAGE2;
			break;

		case 0xC:
			pr_debug("RAM Page register set to EXP_PAGE3\n");
			pgport = EXP_PAGE3;
			break;

		default:
			pr_debug("RAM base address doesn't fall on 16K boundary\n");
			continue;
		}

		pr_debug("current IRQ: %d  b: %d\n",irq[b],b);

		/*
		 * Make sure we got an IRQ
		 */
		if(!irq[b]) {
			/*
			 * No interrupt could be used
			 */
			pr_debug("Failed to acquire an IRQ line\n");
			continue;
		}

		/*
		 * Horray! We found a board, Make sure we can register
		 * it with ISDN4Linux
		 */
		interface = kmalloc(sizeof(isdn_if), GFP_KERNEL);
		if (interface == NULL) {
			/*
			 * Oops, can't malloc isdn_if
			 */
			continue;
		}
		memset(interface, 0, sizeof(isdn_if));

		interface->owner = THIS_MODULE;
		interface->hl_hdrlen = 0;
		interface->channels = channels;
		interface->maxbufsize = BUFFER_SIZE;
		interface->features = features;
		interface->writebuf_skb = sndpkt;
		interface->writecmd = NULL;
		interface->command = command;
		strcpy(interface->id, devname);
		interface->id[2] = '0' + cinst;

		/*
		 * Allocate the board structure
		 */
		sc_adapter[cinst] = kmalloc(sizeof(board), GFP_KERNEL);
		if (sc_adapter[cinst] == NULL) {
			/*
			 * Oops, can't alloc memory for the board
			 */
			kfree(interface);
			continue;
		}
		memset(sc_adapter[cinst], 0, sizeof(board));
		spin_lock_init(&sc_adapter[cinst]->lock);

		if(!register_isdn(interface)) {
			/*
			 * Oops, couldn't register for some reason
			 */
			kfree(interface);
			kfree(sc_adapter[cinst]);
			continue;
		}

		sc_adapter[cinst]->card = interface;
		sc_adapter[cinst]->driverId = interface->channels;
		strcpy(sc_adapter[cinst]->devicename, interface->id);
		sc_adapter[cinst]->nChannels = channels;
		sc_adapter[cinst]->ramsize = memsize;
		sc_adapter[cinst]->shmem_magic = magic;
		sc_adapter[cinst]->shmem_pgport = pgport;
		sc_adapter[cinst]->StartOnReset = 1;

		/*
		 * Allocate channels status structures
		 */
		sc_adapter[cinst]->channel = kmalloc(sizeof(bchan) * channels, GFP_KERNEL);
		if (sc_adapter[cinst]->channel == NULL) {
			/*
			 * Oops, can't alloc memory for the channels
			 */
			indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL);	/* Fix me */
			kfree(interface);
			kfree(sc_adapter[cinst]);
			continue;
		}
		memset(sc_adapter[cinst]->channel, 0, sizeof(bchan) * channels);

		/*
		 * Lock down the hardware resources
		 */
		sc_adapter[cinst]->interrupt = irq[b];
		if (request_irq(sc_adapter[cinst]->interrupt, interrupt_handler,
				IRQF_DISABLED, interface->id, NULL))
		{
			kfree(sc_adapter[cinst]->channel);
			indicate_status(cinst, ISDN_STAT_UNLOAD, 0, NULL);	/* Fix me */
			kfree(interface);
			kfree(sc_adapter[cinst]);
			continue;
			
		}
		sc_adapter[cinst]->iobase = io[b];
		for(i = 0 ; i < MAX_IO_REGS - 1 ; i++) {
			sc_adapter[cinst]->ioport[i] = io[b] + i * 0x400;
			request_region(sc_adapter[cinst]->ioport[i], 1,
					interface->id);
			pr_debug("Requesting I/O Port %#x\n",
				sc_adapter[cinst]->ioport[i]);
		}
		sc_adapter[cinst]->ioport[IRQ_SELECT] = io[b] + 0x2;
		request_region(sc_adapter[cinst]->ioport[IRQ_SELECT], 1,
				interface->id);
		pr_debug("Requesting I/O Port %#x\n",
				sc_adapter[cinst]->ioport[IRQ_SELECT]);
		sc_adapter[cinst]->rambase = ram[b];
		request_region(sc_adapter[cinst]->rambase, SRAM_PAGESIZE,
				interface->id);

		pr_info("  %s (%d) - %s %d channels IRQ %d, I/O Base 0x%x, RAM Base 0x%lx\n", 
			sc_adapter[cinst]->devicename,
			sc_adapter[cinst]->driverId,
			boardname[model], channels, irq[b], io[b], ram[b]);
		
		/*
		 * reset the adapter to put things in motion
		 */
		reset(cinst);

		cinst++;
		status = 0;
	}
	if (status) 
		pr_info("Failed to find any adapters, driver unloaded\n");
	return status;
}

static void __exit sc_exit(void)
{
	int i, j;

	for(i = 0 ; i < cinst ; i++) {
		pr_debug("Cleaning up after adapter %d\n", i);
		/*
		 * kill the timers
		 */
		del_timer(&(sc_adapter[i]->reset_timer));
		del_timer(&(sc_adapter[i]->stat_timer));

		/*
		 * Tell I4L we're toast
		 */
		indicate_status(i, ISDN_STAT_STOP, 0, NULL);
		indicate_status(i, ISDN_STAT_UNLOAD, 0, NULL);

		/*
		 * Release shared RAM
		 */
		release_region(sc_adapter[i]->rambase, SRAM_PAGESIZE);

		/*
		 * Release the IRQ
		 */
		FREE_IRQ(sc_adapter[i]->interrupt, NULL);

		/*
		 * Reset for a clean start
		 */
		outb(0xFF, sc_adapter[i]->ioport[SFT_RESET]);

		/*
		 * Release the I/O Port regions
		 */
		for(j = 0 ; j < MAX_IO_REGS - 1; j++) {
			release_region(sc_adapter[i]->ioport[j], 1);
			pr_debug("Releasing I/O Port %#x\n",
				sc_adapter[i]->ioport[j]);
		}
		release_region(sc_adapter[i]->ioport[IRQ_SELECT], 1);
		pr_debug("Releasing I/O Port %#x\n",
			sc_adapter[i]->ioport[IRQ_SELECT]);

		/*
		 * Release any memory we alloced
		 */
		kfree(sc_adapter[i]->channel);
		kfree(sc_adapter[i]->card);
		kfree(sc_adapter[i]);
	}
	pr_info("SpellCaster ISA ISDN Adapter Driver Unloaded.\n");
}

static int identify_board(unsigned long rambase, unsigned int iobase)
{
	unsigned int pgport;
	unsigned long sig;
	DualPortMemory *dpm;
	RspMessage rcvmsg;
	ReqMessage sndmsg;
	HWConfig_pl hwci;
	int x;

	pr_debug("Attempting to identify adapter @ 0x%lx io 0x%x\n",
		rambase, iobase);

	/*
	 * Enable the base pointer
	 */
	outb(rambase >> 12, iobase + 0x2c00);

	switch(rambase >> 12 & 0x0F) {
	case 0x0:
		pgport = iobase + PG0_OFFSET;
		pr_debug("Page Register offset is 0x%x\n", PG0_OFFSET);
		break;
		
	case 0x4:
		pgport = iobase + PG1_OFFSET;
		pr_debug("Page Register offset is 0x%x\n", PG1_OFFSET);
		break;

	case 0x8:
		pgport = iobase + PG2_OFFSET;
		pr_debug("Page Register offset is 0x%x\n", PG2_OFFSET);
		break;

	case 0xC:
		pgport = iobase + PG3_OFFSET;
		pr_debug("Page Register offset is 0x%x\n", PG3_OFFSET);
		break;
	default:
		pr_debug("Invalid rambase 0x%lx\n", rambase);
		return -1;
	}

	/*
	 * Try to identify a PRI card
	 */
	outb(PRI_BASEPG_VAL, pgport);
	msleep_interruptible(1000);
	sig = readl(rambase + SIG_OFFSET);
	pr_debug("Looking for a signature, got 0x%lx\n", sig);
	if(sig == SIGNATURE)
		return PRI_BOARD;

	/*
	 * Try to identify a PRI card
	 */
	outb(BRI_BASEPG_VAL, pgport);
	msleep_interruptible(1000);
	sig = readl(rambase + SIG_OFFSET);
	pr_debug("Looking for a signature, got 0x%lx\n", sig);
	if(sig == SIGNATURE)
		return BRI_BOARD;

	return -1;

	/*
	 * Try to spot a card
	 */
	sig = readl(rambase + SIG_OFFSET);
	pr_debug("Looking for a signature, got 0x%lx\n", sig);
	if(sig != SIGNATURE)
		return -1;

	dpm = (DualPortMemory *) rambase;

	memset(&sndmsg, 0, MSG_LEN);
	sndmsg.msg_byte_cnt = 3;
	sndmsg.type = cmReqType1;
	sndmsg.class = cmReqClass0;
	sndmsg.code = cmReqHWConfig;
	memcpy_toio(&(dpm->req_queue[dpm->req_head++]), &sndmsg, MSG_LEN);
	outb(0, iobase + 0x400);
	pr_debug("Sent HWConfig message\n");
	/*
	 * Wait for the response
	 */
	x = 0;
	while((inb(iobase + FIFOSTAT_OFFSET) & RF_HAS_DATA) && x < 100) {
		schedule_timeout_interruptible(1);
		x++;
	}
	if(x == 100) {
		pr_debug("Timeout waiting for response\n");
		return -1;
	}

	memcpy_fromio(&rcvmsg, &(dpm->rsp_queue[dpm->rsp_tail]), MSG_LEN);
	pr_debug("Got HWConfig response, status = 0x%x\n", rcvmsg.rsp_status);
	memcpy(&hwci, &(rcvmsg.msg_data.HWCresponse), sizeof(HWConfig_pl));
	pr_debug("Hardware Config: Interface: %s, RAM Size: %ld, Serial: %s\n"
		 "                 Part: %s, Rev: %s\n",
		 hwci.st_u_sense ? "S/T" : "U", hwci.ram_size,
		 hwci.serial_no, hwci.part_no, hwci.rev_no);

	if(!strncmp(PRI_PARTNO, hwci.part_no, 6))
		return PRI_BOARD;
	if(!strncmp(BRI_PARTNO, hwci.part_no, 6))
		return BRI_BOARD;
		
	return -1;
}

module_init(sc_init);
module_exit(sc_exit);