summaryrefslogtreecommitdiffstats
path: root/sound/hda/ext/hdac_ext_stream.c
blob: 3de47dd1a76d856f95c2051b1bde6e55522f2b55 (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
/*
 *  hdac-ext-stream.c - HD-audio extended stream operations.
 *
 *  Copyright (C) 2015 Intel Corp
 *  Author: Jeeja KP <jeeja.kp@intel.com>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/hda_register.h>
#include <sound/hdaudio_ext.h>

/**
 * snd_hdac_ext_stream_init - initialize each stream (aka device)
 * @ebus: HD-audio ext core bus
 * @stream: HD-audio ext core stream object to initialize
 * @idx: stream index number
 * @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
 * @tag: the tag id to assign
 *
 * initialize the stream, if ppcap is enabled then init those and then
 * invoke hdac stream initialization routine
 */
void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
				struct hdac_ext_stream *stream,
				int idx, int direction, int tag)
{
	struct hdac_bus *bus = &ebus->bus;

	if (ebus->ppcap) {
		stream->pphc_addr = ebus->ppcap + AZX_PPHC_BASE +
				AZX_PPHC_INTERVAL * idx;

		stream->pplc_addr = ebus->ppcap + AZX_PPLC_BASE +
				AZX_PPLC_MULTI * ebus->num_streams +
				AZX_PPLC_INTERVAL * idx;
	}

	stream->decoupled = false;
	snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init);

/**
 * snd_hdac_ext_stream_init_all - create and initialize the stream objects
 *   for an extended hda bus
 * @ebus: HD-audio ext core bus
 * @start_idx: start index for streams
 * @num_stream: number of streams to initialize
 * @dir: direction of streams
 */
int snd_hdac_ext_stream_init_all(struct hdac_ext_bus *ebus, int start_idx,
		int num_stream, int dir)
{
	int stream_tag = 0;
	int i, tag, idx = start_idx;

	for (i = 0; i < num_stream; i++) {
		struct hdac_ext_stream *stream =
				kzalloc(sizeof(*stream), GFP_KERNEL);
		if (!stream)
			return -ENOMEM;
		tag = ++stream_tag;
		snd_hdac_ext_stream_init(ebus, stream, idx, dir, tag);
		idx++;
	}

	return 0;

}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);

/**
 * snd_hdac_stream_free_all - free hdac extended stream objects
 *
 * @ebus: HD-audio ext core bus
 */
void snd_hdac_stream_free_all(struct hdac_ext_bus *ebus)
{
	struct hdac_stream *s;
	struct hdac_ext_stream *stream;
	struct hdac_bus *bus = ebus_to_hbus(ebus);

	while (!list_empty(&bus->stream_list)) {
		s = list_first_entry(&bus->stream_list, struct hdac_stream, list);
		stream = stream_to_hdac_ext_stream(s);
		list_del(&s->list);
		kfree(stream);
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_free_all);

/**
 * snd_hdac_ext_stream_decouple - decouple the hdac stream
 * @ebus: HD-audio ext core bus
 * @stream: HD-audio ext core stream object to initialize
 * @decouple: flag to decouple
 */
void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *ebus,
				struct hdac_ext_stream *stream, bool decouple)
{
	struct hdac_stream *hstream = &stream->hstream;
	struct hdac_bus *bus = &ebus->bus;

	spin_lock_irq(&bus->reg_lock);
	if (decouple)
		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0,
				AZX_PPCTL_PROCEN(hstream->index));
	else
		snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL,
					AZX_PPCTL_PROCEN(hstream->index), 0);
	stream->decoupled = decouple;
	spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);

/**
 * snd_hdac_ext_linkstream_start - start a stream
 * @stream: HD-audio ext core stream to start
 */
void snd_hdac_ext_link_stream_start(struct hdac_ext_stream *stream)
{
	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_RUN);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_start);

/**
 * snd_hdac_ext_link_stream_clear - stop a stream DMA
 * @stream: HD-audio ext core stream to stop
 */
void snd_hdac_ext_link_stream_clear(struct hdac_ext_stream *stream)
{
	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_clear);

/**
 * snd_hdac_ext_link_stream_reset - reset a stream
 * @stream: HD-audio ext core stream to reset
 */
void snd_hdac_ext_link_stream_reset(struct hdac_ext_stream *stream)
{
	unsigned char val;
	int timeout;

	snd_hdac_ext_link_stream_clear(stream);

	snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_STRST);
	udelay(3);
	timeout = 50;
	do {
		val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) &
				AZX_PPLCCTL_STRST;
		if (val)
			break;
		udelay(3);
	} while (--timeout);
	val &= ~AZX_PPLCCTL_STRST;
	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
	udelay(3);

	timeout = 50;
	/* waiting for hardware to report that the stream is out of reset */
	do {
		val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
		if (!val)
			break;
		udelay(3);
	} while (--timeout);

}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_reset);

/**
 * snd_hdac_ext_link_stream_setup -  set up the SD for streaming
 * @stream: HD-audio ext core stream to set up
 * @fmt: stream format
 */
int snd_hdac_ext_link_stream_setup(struct hdac_ext_stream *stream, int fmt)
{
	struct hdac_stream *hstream = &stream->hstream;
	unsigned int val;

	/* make sure the run bit is zero for SD */
	snd_hdac_ext_link_stream_clear(stream);
	/* program the stream_tag */
	val = readl(stream->pplc_addr + AZX_REG_PPLCCTL);
	val = (val & ~AZX_PPLCCTL_STRM_MASK) |
		(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
	writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);

	/* program the stream format */
	writew(fmt, stream->pplc_addr + AZX_REG_PPLCFMT);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_setup);

/**
 * snd_hdac_ext_link_set_stream_id - maps stream id to link output
 * @link: HD-audio ext link to set up
 * @stream: stream id
 */
void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
				 int stream)
{
	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 0);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_set_stream_id);

/**
 * snd_hdac_ext_link_clear_stream_id - maps stream id to link output
 * @link: HD-audio ext link to set up
 * @stream: stream id
 */
void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
				 int stream)
{
	snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 0, (1 << stream));
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_clear_stream_id);

static struct hdac_ext_stream *
hdac_ext_link_stream_assign(struct hdac_ext_bus *ebus,
				struct snd_pcm_substream *substream)
{
	struct hdac_ext_stream *res = NULL;
	struct hdac_stream *stream = NULL;
	struct hdac_bus *hbus = &ebus->bus;

	if (!ebus->ppcap) {
		dev_err(hbus->dev, "stream type not supported\n");
		return NULL;
	}

	list_for_each_entry(stream, &hbus->stream_list, list) {
		struct hdac_ext_stream *hstream = container_of(stream,
						struct hdac_ext_stream,
						hstream);
		if (stream->direction != substream->stream)
			continue;

		/* check if decoupled stream and not in use is available */
		if (hstream->decoupled && !hstream->link_locked) {
			res = hstream;
			break;
		}

		if (!hstream->link_locked) {
			snd_hdac_ext_stream_decouple(ebus, hstream, true);
			res = hstream;
			break;
		}
	}
	if (res) {
		spin_lock_irq(&hbus->reg_lock);
		res->link_locked = 1;
		res->link_substream = substream;
		spin_unlock_irq(&hbus->reg_lock);
	}
	return res;
}

static struct hdac_ext_stream *
hdac_ext_host_stream_assign(struct hdac_ext_bus *ebus,
				struct snd_pcm_substream *substream)
{
	struct hdac_ext_stream *res = NULL;
	struct hdac_stream *stream = NULL;
	struct hdac_bus *hbus = &ebus->bus;
	int key;

	if (!ebus->ppcap) {
		dev_err(hbus->dev, "stream type not supported\n");
		return NULL;
	}

	/* make a non-zero unique key for the substream */
	key = (substream->pcm->device << 16) | (substream->number << 2) |
			(substream->stream + 1);

	list_for_each_entry(stream, &hbus->stream_list, list) {
		struct hdac_ext_stream *hstream = container_of(stream,
						struct hdac_ext_stream,
						hstream);
		if (stream->direction != substream->stream)
			continue;

		if (!stream->opened) {
			if (!hstream->decoupled)
				snd_hdac_ext_stream_decouple(ebus, hstream, true);
			res = hstream;
			break;
		}
	}
	if (res) {
		spin_lock_irq(&hbus->reg_lock);
		res->hstream.opened = 1;
		res->hstream.running = 0;
		res->hstream.assigned_key = key;
		res->hstream.substream = substream;
		spin_unlock_irq(&hbus->reg_lock);
	}

	return res;
}

/**
 * snd_hdac_ext_stream_assign - assign a stream for the PCM
 * @ebus: HD-audio ext core bus
 * @substream: PCM substream to assign
 * @type: type of stream (coupled, host or link stream)
 *
 * This assigns the stream based on the type (coupled/host/link), for the
 * given PCM substream, assigns it and returns the stream object
 *
 * coupled: Looks for an unused stream
 * host: Looks for an unused decoupled host stream
 * link: Looks for an unused decoupled link stream
 *
 * If no stream is free, returns NULL. The function tries to keep using
 * the same stream object when it's used beforehand.  when a stream is
 * decoupled, it becomes a host stream and link stream.
 */
struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_ext_bus *ebus,
					   struct snd_pcm_substream *substream,
					   int type)
{
	struct hdac_ext_stream *hstream = NULL;
	struct hdac_stream *stream = NULL;
	struct hdac_bus *hbus = &ebus->bus;

	switch (type) {
	case HDAC_EXT_STREAM_TYPE_COUPLED:
		stream = snd_hdac_stream_assign(hbus, substream);
		if (stream)
			hstream = container_of(stream,
					struct hdac_ext_stream, hstream);
		return hstream;

	case HDAC_EXT_STREAM_TYPE_HOST:
		return hdac_ext_host_stream_assign(ebus, substream);

	case HDAC_EXT_STREAM_TYPE_LINK:
		return hdac_ext_link_stream_assign(ebus, substream);

	default:
		return NULL;
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);

/**
 * snd_hdac_ext_stream_release - release the assigned stream
 * @stream: HD-audio ext core stream to release
 * @type: type of stream (coupled, host or link stream)
 *
 * Release the stream that has been assigned by snd_hdac_ext_stream_assign().
 */
void snd_hdac_ext_stream_release(struct hdac_ext_stream *stream, int type)
{
	struct hdac_bus *bus = stream->hstream.bus;
	struct hdac_ext_bus *ebus = hbus_to_ebus(bus);

	switch (type) {
	case HDAC_EXT_STREAM_TYPE_COUPLED:
		snd_hdac_stream_release(&stream->hstream);
		break;

	case HDAC_EXT_STREAM_TYPE_HOST:
		if (stream->decoupled) {
			snd_hdac_ext_stream_decouple(ebus, stream, false);
			snd_hdac_stream_release(&stream->hstream);
		}
		break;

	case HDAC_EXT_STREAM_TYPE_LINK:
		if (stream->decoupled)
			snd_hdac_ext_stream_decouple(ebus, stream, false);
		spin_lock_irq(&bus->reg_lock);
		stream->link_locked = 0;
		stream->link_substream = NULL;
		spin_unlock_irq(&bus->reg_lock);
		break;

	default:
		dev_dbg(bus->dev, "Invalid type %d\n", type);
	}

}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);

/**
 * snd_hdac_ext_stream_spbcap_enable - enable SPIB for a stream
 * @ebus: HD-audio ext core bus
 * @enable: flag to enable/disable SPIB
 * @index: stream index for which SPIB need to be enabled
 */
void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *ebus,
				 bool enable, int index)
{
	u32 mask = 0;
	u32 register_mask = 0;
	struct hdac_bus *bus = &ebus->bus;

	if (!ebus->spbcap) {
		dev_err(bus->dev, "Address of SPB capability is NULL");
		return;
	}

	mask |= (1 << index);

	register_mask = snd_hdac_chip_readl(bus, SPB_SPBFCCTL);

	mask |= register_mask;

	if (enable)
		snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, 0, mask);
	else
		snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, mask, 0);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_spbcap_enable);

/**
 * snd_hdac_ext_stop_streams - stop all stream if running
 * @ebus: HD-audio ext core bus
 */
void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
{
	struct hdac_bus *bus = ebus_to_hbus(ebus);
	struct hdac_stream *stream;

	if (bus->chip_init) {
		list_for_each_entry(stream, &bus->stream_list, list)
			snd_hdac_stream_stop(stream);
		snd_hdac_bus_stop_chip(bus);
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);