summaryrefslogtreecommitdiff
path: root/drivers/block/paride/paride.c
blob: e4c55e0501268d46648da94ca3ad8756fe3894ca (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
/* 
        paride.c  (c) 1997-8  Grant R. Guenther <grant@torque.net>
                              Under the terms of the GNU General Public License.

	This is the base module for the family of device drivers
        that support parallel port IDE devices.  

*/

/* Changes:

	1.01	GRG 1998.05.03	Use spinlocks
	1.02	GRG 1998.05.05  init_proto, release_proto, ktti
	1.03	GRG 1998.08.15  eliminate compiler warning
	1.04    GRG 1998.11.28  added support for FRIQ 
	1.05    TMW 2000.06.06  use parport_find_number instead of
				parport_enumerate
	1.06    TMW 2001.03.26  more sane parport-or-not resource management
*/

#define PI_VERSION      "1.06"

#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/sched.h>	/* TASK_* */

#ifdef CONFIG_PARPORT_MODULE
#define CONFIG_PARPORT
#endif

#ifdef CONFIG_PARPORT
#include <linux/parport.h>
#endif

#include "paride.h"

MODULE_LICENSE("GPL");

#define MAX_PROTOS	32

static struct pi_protocol *protocols[MAX_PROTOS];

static DEFINE_SPINLOCK(pi_spinlock);

void pi_write_regr(PIA * pi, int cont, int regr, int val)
{
	pi->proto->write_regr(pi, cont, regr, val);
}

EXPORT_SYMBOL(pi_write_regr);

int pi_read_regr(PIA * pi, int cont, int regr)
{
	return pi->proto->read_regr(pi, cont, regr);
}

EXPORT_SYMBOL(pi_read_regr);

void pi_write_block(PIA * pi, char *buf, int count)
{
	pi->proto->write_block(pi, buf, count);
}

EXPORT_SYMBOL(pi_write_block);

void pi_read_block(PIA * pi, char *buf, int count)
{
	pi->proto->read_block(pi, buf, count);
}

EXPORT_SYMBOL(pi_read_block);

#ifdef CONFIG_PARPORT

static void pi_wake_up(void *p)
{
	PIA *pi = (PIA *) p;
	unsigned long flags;
	void (*cont) (void) = NULL;

	spin_lock_irqsave(&pi_spinlock, flags);

	if (pi->claim_cont && !parport_claim(pi->pardev)) {
		cont = pi->claim_cont;
		pi->claim_cont = NULL;
		pi->claimed = 1;
	}

	spin_unlock_irqrestore(&pi_spinlock, flags);

	wake_up(&(pi->parq));

	if (cont)
		cont();
}

#endif

int pi_schedule_claimed(PIA * pi, void (*cont) (void))
{
#ifdef CONFIG_PARPORT
	unsigned long flags;

	spin_lock_irqsave(&pi_spinlock, flags);
	if (pi->pardev && parport_claim(pi->pardev)) {
		pi->claim_cont = cont;
		spin_unlock_irqrestore(&pi_spinlock, flags);
		return 0;
	}
	pi->claimed = 1;
	spin_unlock_irqrestore(&pi_spinlock, flags);
#endif
	return 1;
}
EXPORT_SYMBOL(pi_schedule_claimed);

void pi_do_claimed(PIA * pi, void (*cont) (void))
{
	if (pi_schedule_claimed(pi, cont))
		cont();
}

EXPORT_SYMBOL(pi_do_claimed);

static void pi_claim(PIA * pi)
{
	if (pi->claimed)
		return;
	pi->claimed = 1;
#ifdef CONFIG_PARPORT
	if (pi->pardev)
		wait_event(pi->parq,
			   !parport_claim((struct pardevice *) pi->pardev));
#endif
}

static void pi_unclaim(PIA * pi)
{
	pi->claimed = 0;
#ifdef CONFIG_PARPORT
	if (pi->pardev)
		parport_release((struct pardevice *) (pi->pardev));
#endif
}

void pi_connect(PIA * pi)
{
	pi_claim(pi);
	pi->proto->connect(pi);
}

EXPORT_SYMBOL(pi_connect);

void pi_disconnect(PIA * pi)
{
	pi->proto->disconnect(pi);
	pi_unclaim(pi);
}

EXPORT_SYMBOL(pi_disconnect);

static void pi_unregister_parport(PIA * pi)
{
#ifdef CONFIG_PARPORT
	if (pi->pardev) {
		parport_unregister_device((struct pardevice *) (pi->pardev));
		pi->pardev = NULL;
	}
#endif
}

void pi_release(PIA * pi)
{
	pi_unregister_parport(pi);
#ifndef CONFIG_PARPORT
	if (pi->reserved)
		release_region(pi->port, pi->reserved);
#endif				/* !CONFIG_PARPORT */
	if (pi->proto->release_proto)
		pi->proto->release_proto(pi);
	module_put(pi->proto->owner);
}

EXPORT_SYMBOL(pi_release);

static int default_test_proto(PIA * pi, char *scratch, int verbose)
{
	int j, k;
	int e[2] = { 0, 0 };

	pi->proto->connect(pi);

	for (j = 0; j < 2; j++) {
		pi_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
		for (k = 0; k < 256; k++) {
			pi_write_regr(pi, 0, 2, k ^ 0xaa);
			pi_write_regr(pi, 0, 3, k ^ 0x55);
			if (pi_read_regr(pi, 0, 2) != (k ^ 0xaa))
				e[j]++;
		}
	}
	pi->proto->disconnect(pi);

	if (verbose)
		printk("%s: %s: port 0x%x, mode  %d, test=(%d,%d)\n",
		       pi->device, pi->proto->name, pi->port,
		       pi->mode, e[0], e[1]);

	return (e[0] && e[1]);	/* not here if both > 0 */
}

static int pi_test_proto(PIA * pi, char *scratch, int verbose)
{
	int res;

	pi_claim(pi);
	if (pi->proto->test_proto)
		res = pi->proto->test_proto(pi, scratch, verbose);
	else
		res = default_test_proto(pi, scratch, verbose);
	pi_unclaim(pi);

	return res;
}

int paride_register(PIP * pr)
{
	int k;

	for (k = 0; k < MAX_PROTOS; k++)
		if (protocols[k] && !strcmp(pr->name, protocols[k]->name)) {
			printk("paride: %s protocol already registered\n",
			       pr->name);
			return -1;
		}
	k = 0;
	while ((k < MAX_PROTOS) && (protocols[k]))
		k++;
	if (k == MAX_PROTOS) {
		printk("paride: protocol table full\n");
		return -1;
	}
	protocols[k] = pr;
	pr->index = k;
	printk("paride: %s registered as protocol %d\n", pr->name, k);
	return 0;
}

EXPORT_SYMBOL(paride_register);

void paride_unregister(PIP * pr)
{
	if (!pr)
		return;
	if (protocols[pr->index] != pr) {
		printk("paride: %s not registered\n", pr->name);
		return;
	}
	protocols[pr->index] = NULL;
}

EXPORT_SYMBOL(paride_unregister);

static int pi_register_parport(PIA * pi, int verbose)
{
#ifdef CONFIG_PARPORT

	struct parport *port;

	port = parport_find_base(pi->port);
	if (!port)
		return 0;

	pi->pardev = parport_register_device(port,
					     pi->device, NULL,
					     pi_wake_up, NULL, 0, (void *) pi);
	parport_put_port(port);
	if (!pi->pardev)
		return 0;

	init_waitqueue_head(&pi->parq);

	if (verbose)
		printk("%s: 0x%x is %s\n", pi->device, pi->port, port->name);

	pi->parname = (char *) port->name;
#endif

	return 1;
}

static int pi_probe_mode(PIA * pi, int max, char *scratch, int verbose)
{
	int best, range;

	if (pi->mode != -1) {
		if (pi->mode >= max)
			return 0;
		range = 3;
		if (pi->mode >= pi->proto->epp_first)
			range = 8;
		if ((range == 8) && (pi->port % 8))
			return 0;
		pi->reserved = range;
		return (!pi_test_proto(pi, scratch, verbose));
	}
	best = -1;
	for (pi->mode = 0; pi->mode < max; pi->mode++) {
		range = 3;
		if (pi->mode >= pi->proto->epp_first)
			range = 8;
		if ((range == 8) && (pi->port % 8))
			break;
		pi->reserved = range;
		if (!pi_test_proto(pi, scratch, verbose))
			best = pi->mode;
	}
	pi->mode = best;
	return (best > -1);
}

static int pi_probe_unit(PIA * pi, int unit, char *scratch, int verbose)
{
	int max, s, e;

	s = unit;
	e = s + 1;

	if (s == -1) {
		s = 0;
		e = pi->proto->max_units;
	}

	if (!pi_register_parport(pi, verbose))
		return 0;

	if (pi->proto->test_port) {
		pi_claim(pi);
		max = pi->proto->test_port(pi);
		pi_unclaim(pi);
	} else
		max = pi->proto->max_mode;

	if (pi->proto->probe_unit) {
		pi_claim(pi);
		for (pi->unit = s; pi->unit < e; pi->unit++)
			if (pi->proto->probe_unit(pi)) {
				pi_unclaim(pi);
				if (pi_probe_mode(pi, max, scratch, verbose))
					return 1;
				pi_unregister_parport(pi);
				return 0;
			}
		pi_unclaim(pi);
		pi_unregister_parport(pi);
		return 0;
	}

	if (!pi_probe_mode(pi, max, scratch, verbose)) {
		pi_unregister_parport(pi);
		return 0;
	}
	return 1;

}

int pi_init(PIA * pi, int autoprobe, int port, int mode,
	int unit, int protocol, int delay, char *scratch,
	int devtype, int verbose, char *device)
{
	int p, k, s, e;
	int lpts[7] = { 0x3bc, 0x378, 0x278, 0x268, 0x27c, 0x26c, 0 };

	s = protocol;
	e = s + 1;

	if (!protocols[0])
		request_module("paride_protocol");

	if (autoprobe) {
		s = 0;
		e = MAX_PROTOS;
	} else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) ||
		   (!protocols[s]) || (unit < 0) ||
		   (unit >= protocols[s]->max_units)) {
		printk("%s: Invalid parameters\n", device);
		return 0;
	}

	for (p = s; p < e; p++) {
		struct pi_protocol *proto = protocols[p];
		if (!proto)
			continue;
		/* still racy */
		if (!try_module_get(proto->owner))
			continue;
		pi->proto = proto;
		pi->private = 0;
		if (proto->init_proto && proto->init_proto(pi) < 0) {
			pi->proto = NULL;
			module_put(proto->owner);
			continue;
		}
		if (delay == -1)
			pi->delay = pi->proto->default_delay;
		else
			pi->delay = delay;
		pi->devtype = devtype;
		pi->device = device;

		pi->parname = NULL;
		pi->pardev = NULL;
		init_waitqueue_head(&pi->parq);
		pi->claimed = 0;
		pi->claim_cont = NULL;

		pi->mode = mode;
		if (port != -1) {
			pi->port = port;
			if (pi_probe_unit(pi, unit, scratch, verbose))
				break;
			pi->port = 0;
		} else {
			k = 0;
			while ((pi->port = lpts[k++]))
				if (pi_probe_unit
				    (pi, unit, scratch, verbose))
					break;
			if (pi->port)
				break;
		}
		if (pi->proto->release_proto)
			pi->proto->release_proto(pi);
		module_put(proto->owner);
	}

	if (!pi->port) {
		if (autoprobe)
			printk("%s: Autoprobe failed\n", device);
		else
			printk("%s: Adapter not found\n", device);
		return 0;
	}
#ifndef CONFIG_PARPORT
	if (!request_region(pi->port, pi->reserved, pi->device)) {
		printk(KERN_WARNING "paride: Unable to request region 0x%x\n",
		       pi->port);
		return 0;
	}
#endif				/* !CONFIG_PARPORT */

	if (pi->parname)
		printk("%s: Sharing %s at 0x%x\n", pi->device,
		       pi->parname, pi->port);

	pi->proto->log_adapter(pi, scratch, verbose);

	return 1;
}

EXPORT_SYMBOL(pi_init);