aboutsummaryrefslogtreecommitdiff
path: root/sound/firewire/tascam/tascam-stream.c
blob: dfe783d01d7d20cb4295625cecc8d5953f3607b3 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * tascam-stream.c - a part of driver for TASCAM FireWire series
 *
 * Copyright (c) 2015 Takashi Sakamoto
 */

#include <linux/delay.h>
#include "tascam.h"

#define CLOCK_STATUS_MASK      0xffff0000
#define CLOCK_CONFIG_MASK      0x0000ffff

#define READY_TIMEOUT_MS	4000

static int get_clock(struct snd_tscm *tscm, u32 *data)
{
	int trial = 0;
	__be32 reg;
	int err;

	while (trial++ < 5) {
		err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
				TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS,
				&reg, sizeof(reg), 0);
		if (err < 0)
			return err;

		*data = be32_to_cpu(reg);
		if (*data & CLOCK_STATUS_MASK)
			break;

		// In intermediate state after changing clock status.
		msleep(50);
	}

	// Still in the intermediate state.
	if (trial >= 5)
		return -EAGAIN;

	return 0;
}

static int set_clock(struct snd_tscm *tscm, unsigned int rate,
		     enum snd_tscm_clock clock)
{
	u32 data;
	__be32 reg;
	int err;

	err = get_clock(tscm, &data);
	if (err < 0)
		return err;
	data &= CLOCK_CONFIG_MASK;

	if (rate > 0) {
		data &= 0x000000ff;
		/* Base rate. */
		if ((rate % 44100) == 0) {
			data |= 0x00000100;
			/* Multiplier. */
			if (rate / 44100 == 2)
				data |= 0x00008000;
		} else if ((rate % 48000) == 0) {
			data |= 0x00000200;
			/* Multiplier. */
			if (rate / 48000 == 2)
				data |= 0x00008000;
		} else {
			return -EAGAIN;
		}
	}

	if (clock != INT_MAX) {
		data &= 0x0000ff00;
		data |= clock + 1;
	}

	reg = cpu_to_be32(data);

	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	if (data & 0x00008000)
		reg = cpu_to_be32(0x0000001a);
	else
		reg = cpu_to_be32(0x0000000d);

	return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				  TSCM_ADDR_BASE + TSCM_OFFSET_MULTIPLEX_MODE,
				  &reg, sizeof(reg), 0);
}

int snd_tscm_stream_get_rate(struct snd_tscm *tscm, unsigned int *rate)
{
	u32 data;
	int err;

	err = get_clock(tscm, &data);
	if (err < 0)
		return err;

	data = (data & 0xff000000) >> 24;

	/* Check base rate. */
	if ((data & 0x0f) == 0x01)
		*rate = 44100;
	else if ((data & 0x0f) == 0x02)
		*rate = 48000;
	else
		return -EAGAIN;

	/* Check multiplier. */
	if ((data & 0xf0) == 0x80)
		*rate *= 2;
	else if ((data & 0xf0) != 0x00)
		return -EAGAIN;

	return err;
}

int snd_tscm_stream_get_clock(struct snd_tscm *tscm, enum snd_tscm_clock *clock)
{
	u32 data;
	int err;

	err = get_clock(tscm, &data);
	if (err < 0)
		return err;

	*clock = ((data & 0x00ff0000) >> 16) - 1;
	if (*clock < 0 || *clock > SND_TSCM_CLOCK_ADAT)
		return -EIO;

	return 0;
}

static int enable_data_channels(struct snd_tscm *tscm)
{
	__be32 reg;
	u32 data;
	unsigned int i;
	int err;

	data = 0;
	for (i = 0; i < tscm->spec->pcm_capture_analog_channels; ++i)
		data |= BIT(i);
	if (tscm->spec->has_adat)
		data |= 0x0000ff00;
	if (tscm->spec->has_spdif)
		data |= 0x00030000;

	reg = cpu_to_be32(data);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_TX_PCM_CHANNELS,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	data = 0;
	for (i = 0; i < tscm->spec->pcm_playback_analog_channels; ++i)
		data |= BIT(i);
	if (tscm->spec->has_adat)
		data |= 0x0000ff00;
	if (tscm->spec->has_spdif)
		data |= 0x00030000;

	reg = cpu_to_be32(data);
	return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				  TSCM_ADDR_BASE + TSCM_OFFSET_RX_PCM_CHANNELS,
				  &reg, sizeof(reg), 0);
}

static int set_stream_formats(struct snd_tscm *tscm, unsigned int rate)
{
	__be32 reg;
	int err;

	// Set an option for unknown purpose.
	reg = cpu_to_be32(0x00200000);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	return enable_data_channels(tscm);
}

static void finish_session(struct snd_tscm *tscm)
{
	__be32 reg;

	reg = 0;
	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
			   TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING,
			   &reg, sizeof(reg), 0);

	reg = 0;
	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
			   TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON,
			   &reg, sizeof(reg), 0);

	// Unregister channels.
	reg = cpu_to_be32(0x00000000);
	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
			   TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH,
			   &reg, sizeof(reg), 0);
	reg = cpu_to_be32(0x00000000);
	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
			   TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN,
			   &reg, sizeof(reg), 0);
	reg = cpu_to_be32(0x00000000);
	snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
			   TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH,
			   &reg, sizeof(reg), 0);
}

static int begin_session(struct snd_tscm *tscm)
{
	__be32 reg;
	int err;

	// Register the isochronous channel for transmitting stream.
	reg = cpu_to_be32(tscm->tx_resources.channel);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	// Unknown.
	reg = cpu_to_be32(0x00000002);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	// Register the isochronous channel for receiving stream.
	reg = cpu_to_be32(tscm->rx_resources.channel);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	reg = cpu_to_be32(0x00000001);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	reg = cpu_to_be32(0x00000001);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	// Set an option for unknown purpose.
	reg = cpu_to_be32(0x00002000);
	err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST,
				 TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION,
				 &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	// Start multiplexing PCM samples on packets.
	reg = cpu_to_be32(0x00000001);
	return snd_fw_transaction(tscm->unit,
				  TCODE_WRITE_QUADLET_REQUEST,
				  TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_ON,
				  &reg, sizeof(reg), 0);
}

static int keep_resources(struct snd_tscm *tscm, unsigned int rate,
			  struct amdtp_stream *stream)
{
	struct fw_iso_resources *resources;
	int err;

	if (stream == &tscm->tx_stream)
		resources = &tscm->tx_resources;
	else
		resources = &tscm->rx_resources;

	err = amdtp_tscm_set_parameters(stream, rate);
	if (err < 0)
		return err;

	return fw_iso_resources_allocate(resources,
				amdtp_stream_get_max_payload(stream),
				fw_parent_device(tscm->unit)->max_speed);
}

static int init_stream(struct snd_tscm *tscm, struct amdtp_stream *s)
{
	struct fw_iso_resources *resources;
	enum amdtp_stream_direction dir;
	unsigned int pcm_channels;
	int err;

	if (s == &tscm->tx_stream) {
		resources = &tscm->tx_resources;
		dir = AMDTP_IN_STREAM;
		pcm_channels = tscm->spec->pcm_capture_analog_channels;
	} else {
		resources = &tscm->rx_resources;
		dir = AMDTP_OUT_STREAM;
		pcm_channels = tscm->spec->pcm_playback_analog_channels;
	}

	if (tscm->spec->has_adat)
		pcm_channels += 8;
	if (tscm->spec->has_spdif)
		pcm_channels += 2;

	err = fw_iso_resources_init(resources, tscm->unit);
	if (err < 0)
		return err;

	err = amdtp_tscm_init(s, tscm->unit, dir, pcm_channels);
	if (err < 0)
		fw_iso_resources_free(resources);

	return err;
}

static void destroy_stream(struct snd_tscm *tscm, struct amdtp_stream *s)
{
	amdtp_stream_destroy(s);

	if (s == &tscm->tx_stream)
		fw_iso_resources_destroy(&tscm->tx_resources);
	else
		fw_iso_resources_destroy(&tscm->rx_resources);
}

int snd_tscm_stream_init_duplex(struct snd_tscm *tscm)
{
	int err;

	err = init_stream(tscm, &tscm->tx_stream);
	if (err < 0)
		return err;

	err = init_stream(tscm, &tscm->rx_stream);
	if (err < 0) {
		destroy_stream(tscm, &tscm->tx_stream);
		return err;
	}

	err = amdtp_domain_init(&tscm->domain);
	if (err < 0) {
		destroy_stream(tscm, &tscm->tx_stream);
		destroy_stream(tscm, &tscm->rx_stream);
	}

	return err;
}

// At bus reset, streaming is stopped and some registers are clear.
void snd_tscm_stream_update_duplex(struct snd_tscm *tscm)
{
	amdtp_domain_stop(&tscm->domain);

	amdtp_stream_pcm_abort(&tscm->tx_stream);
	amdtp_stream_pcm_abort(&tscm->rx_stream);
}

// This function should be called before starting streams or after stopping
// streams.
void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm)
{
	amdtp_domain_destroy(&tscm->domain);

	destroy_stream(tscm, &tscm->rx_stream);
	destroy_stream(tscm, &tscm->tx_stream);
}

int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate,
				   unsigned int frames_per_period,
				   unsigned int frames_per_buffer)
{
	unsigned int curr_rate;
	int err;

	err = snd_tscm_stream_get_rate(tscm, &curr_rate);
	if (err < 0)
		return err;

	if (tscm->substreams_counter == 0 || rate != curr_rate) {
		amdtp_domain_stop(&tscm->domain);

		finish_session(tscm);

		fw_iso_resources_free(&tscm->tx_resources);
		fw_iso_resources_free(&tscm->rx_resources);

		err = set_clock(tscm, rate, INT_MAX);
		if (err < 0)
			return err;

		err = keep_resources(tscm, rate, &tscm->tx_stream);
		if (err < 0)
			return err;

		err = keep_resources(tscm, rate, &tscm->rx_stream);
		if (err < 0) {
			fw_iso_resources_free(&tscm->tx_resources);
			return err;
		}

		err = amdtp_domain_set_events_per_period(&tscm->domain,
					frames_per_period, frames_per_buffer);
		if (err < 0) {
			fw_iso_resources_free(&tscm->tx_resources);
			fw_iso_resources_free(&tscm->rx_resources);
			return err;
		}

		tscm->need_long_tx_init_skip = (rate != curr_rate);
	}

	return 0;
}

int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate)
{
	unsigned int generation = tscm->rx_resources.generation;
	int err;

	if (tscm->substreams_counter == 0)
		return 0;

	if (amdtp_streaming_error(&tscm->rx_stream) ||
	    amdtp_streaming_error(&tscm->tx_stream)) {
		amdtp_domain_stop(&tscm->domain);
		finish_session(tscm);
	}

	if (generation != fw_parent_device(tscm->unit)->card->generation) {
		err = fw_iso_resources_update(&tscm->tx_resources);
		if (err < 0)
			goto error;

		err = fw_iso_resources_update(&tscm->rx_resources);
		if (err < 0)
			goto error;
	}

	if (!amdtp_stream_running(&tscm->rx_stream)) {
		int spd = fw_parent_device(tscm->unit)->max_speed;
		unsigned int tx_init_skip_cycles;

		err = set_stream_formats(tscm, rate);
		if (err < 0)
			goto error;

		err = begin_session(tscm);
		if (err < 0)
			goto error;

		err = amdtp_domain_add_stream(&tscm->domain, &tscm->rx_stream,
					      tscm->rx_resources.channel, spd);
		if (err < 0)
			goto error;

		err = amdtp_domain_add_stream(&tscm->domain, &tscm->tx_stream,
					      tscm->tx_resources.channel, spd);
		if (err < 0)
			goto error;

		if (tscm->need_long_tx_init_skip)
			tx_init_skip_cycles = 16000;
		else
			tx_init_skip_cycles = 0;

		// MEMO: Just after starting packet streaming, it transfers packets without any
		// event. Enough after receiving the sequence of packets, it multiplexes events into
		// the packet. However, just after changing sampling transfer frequency, it stops
		// multiplexing during packet transmission. Enough after, it restarts multiplexing
		// again. The device ignores presentation time expressed by the value of syt field
		// of CIP header in received packets. The sequence of the number of data blocks per
		// packet is important for media clock recovery.
		err = amdtp_domain_start(&tscm->domain, tx_init_skip_cycles, true, true);
		if (err < 0)
			goto error;

		if (!amdtp_domain_wait_ready(&tscm->domain, READY_TIMEOUT_MS)) {
			err = -ETIMEDOUT;
			goto error;
		}
	}

	return 0;
error:
	amdtp_domain_stop(&tscm->domain);
	finish_session(tscm);

	return err;
}

void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm)
{
	if (tscm->substreams_counter == 0) {
		amdtp_domain_stop(&tscm->domain);
		finish_session(tscm);

		fw_iso_resources_free(&tscm->tx_resources);
		fw_iso_resources_free(&tscm->rx_resources);

		tscm->need_long_tx_init_skip = false;
	}
}

void snd_tscm_stream_lock_changed(struct snd_tscm *tscm)
{
	tscm->dev_lock_changed = true;
	wake_up(&tscm->hwdep_wait);
}

int snd_tscm_stream_lock_try(struct snd_tscm *tscm)
{
	int err;

	spin_lock_irq(&tscm->lock);

	/* user land lock this */
	if (tscm->dev_lock_count < 0) {
		err = -EBUSY;
		goto end;
	}

	/* this is the first time */
	if (tscm->dev_lock_count++ == 0)
		snd_tscm_stream_lock_changed(tscm);
	err = 0;
end:
	spin_unlock_irq(&tscm->lock);
	return err;
}

void snd_tscm_stream_lock_release(struct snd_tscm *tscm)
{
	spin_lock_irq(&tscm->lock);

	if (WARN_ON(tscm->dev_lock_count <= 0))
		goto end;
	if (--tscm->dev_lock_count == 0)
		snd_tscm_stream_lock_changed(tscm);
end:
	spin_unlock_irq(&tscm->lock);
}