summaryrefslogtreecommitdiff
path: root/sound/soc/fsl/fsl_asrc_dma.c
blob: ece130f59d15c98d5c49d70b51074ebf45765c81 (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
// SPDX-License-Identifier: GPL-2.0
//
// Freescale ASRC ALSA SoC Platform (DMA) driver
//
// Copyright (C) 2014 Freescale Semiconductor, Inc.
//
// Author: Nicolin Chen <nicoleotsuka@gmail.com>

#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/platform_data/dma-imx.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>

#include "fsl_asrc.h"

#define FSL_ASRC_DMABUF_SIZE	(256 * 1024)

static struct snd_pcm_hardware snd_imx_hardware = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID,
	.buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
	.period_bytes_min = 128,
	.period_bytes_max = 65535, /* Limited by SDMA engine */
	.periods_min = 2,
	.periods_max = 255,
	.fifo_size = 0,
};

static bool filter(struct dma_chan *chan, void *param)
{
	if (!imx_dma_is_general_purpose(chan))
		return false;

	chan->private = param;

	return true;
}

static void fsl_asrc_dma_complete(void *arg)
{
	struct snd_pcm_substream *substream = arg;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;

	pair->pos += snd_pcm_lib_period_bytes(substream);
	if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
		pair->pos = 0;

	snd_pcm_period_elapsed(substream);
}

static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream,
					   struct snd_soc_component *component)
{
	u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;
	struct device *dev = component->dev;
	unsigned long flags = DMA_CTRL_ACK;

	/* Prepare and submit Front-End DMA channel */
	if (!substream->runtime->no_period_wakeup)
		flags |= DMA_PREP_INTERRUPT;

	pair->pos = 0;
	pair->desc[!dir] = dmaengine_prep_dma_cyclic(
			pair->dma_chan[!dir], runtime->dma_addr,
			snd_pcm_lib_buffer_bytes(substream),
			snd_pcm_lib_period_bytes(substream),
			dir == OUT ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, flags);
	if (!pair->desc[!dir]) {
		dev_err(dev, "failed to prepare slave DMA for Front-End\n");
		return -ENOMEM;
	}

	pair->desc[!dir]->callback = fsl_asrc_dma_complete;
	pair->desc[!dir]->callback_param = substream;

	dmaengine_submit(pair->desc[!dir]);

	/* Prepare and submit Back-End DMA channel */
	pair->desc[dir] = dmaengine_prep_dma_cyclic(
			pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
	if (!pair->desc[dir]) {
		dev_err(dev, "failed to prepare slave DMA for Back-End\n");
		return -ENOMEM;
	}

	dmaengine_submit(pair->desc[dir]);

	return 0;
}

static int fsl_asrc_dma_trigger(struct snd_soc_component *component,
				struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;
	int ret;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ret = fsl_asrc_dma_prepare_and_submit(substream, component);
		if (ret)
			return ret;
		dma_async_issue_pending(pair->dma_chan[IN]);
		dma_async_issue_pending(pair->dma_chan[OUT]);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		dmaengine_terminate_all(pair->dma_chan[OUT]);
		dmaengine_terminate_all(pair->dma_chan[IN]);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
				  struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params)
{
	enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL;
	struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;
	struct fsl_asrc *asrc_priv = pair->asrc_priv;
	struct dma_slave_config config_fe, config_be;
	enum asrc_pair_index index = pair->index;
	struct device *dev = component->dev;
	int stream = substream->stream;
	struct imx_dma_data *tmp_data;
	struct snd_soc_dpcm *dpcm;
	struct dma_chan *tmp_chan;
	struct device *dev_be;
	u8 dir = tx ? OUT : IN;
	dma_cap_mask_t mask;
	int ret;

	/* Fetch the Back-End dma_data from DPCM */
	for_each_dpcm_be(rtd, stream, dpcm) {
		struct snd_soc_pcm_runtime *be = dpcm->be;
		struct snd_pcm_substream *substream_be;
		struct snd_soc_dai *dai = be->cpu_dai;

		if (dpcm->fe != rtd)
			continue;

		substream_be = snd_soc_dpcm_get_substream(be, stream);
		dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
		dev_be = dai->dev;
		break;
	}

	if (!dma_params_be) {
		dev_err(dev, "failed to get the substream of Back-End\n");
		return -EINVAL;
	}

	/* Override dma_data of the Front-End and config its dmaengine */
	dma_params_fe = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
	dma_params_fe->maxburst = dma_params_be->maxburst;

	pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir);
	if (!pair->dma_chan[!dir]) {
		dev_err(dev, "failed to request DMA channel\n");
		return -EINVAL;
	}

	memset(&config_fe, 0, sizeof(config_fe));
	ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
	if (ret) {
		dev_err(dev, "failed to prepare DMA config for Front-End\n");
		return ret;
	}

	ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
	if (ret) {
		dev_err(dev, "failed to config DMA channel for Front-End\n");
		return ret;
	}

	/* Request and config DMA channel for Back-End */
	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	dma_cap_set(DMA_CYCLIC, mask);

	/*
	 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each
	 * peripheral, unlike SDMA channel that is allocated dynamically. So no
	 * need to configure dma_request and dma_request2, but get dma_chan via
	 * dma_request_slave_channel directly with dma name of Front-End device
	 */
	if (!asrc_priv->soc->use_edma) {
		/* Get DMA request of Back-End */
		tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
		tmp_data = tmp_chan->private;
		pair->dma_data.dma_request = tmp_data->dma_request;
		dma_release_channel(tmp_chan);

		/* Get DMA request of Front-End */
		tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
		tmp_data = tmp_chan->private;
		pair->dma_data.dma_request2 = tmp_data->dma_request;
		pair->dma_data.peripheral_type = tmp_data->peripheral_type;
		pair->dma_data.priority = tmp_data->priority;
		dma_release_channel(tmp_chan);

		pair->dma_chan[dir] =
			dma_request_channel(mask, filter, &pair->dma_data);
	} else {
		pair->dma_chan[dir] =
			fsl_asrc_get_dma_channel(pair, dir);
	}

	if (!pair->dma_chan[dir]) {
		dev_err(dev, "failed to request DMA channel for Back-End\n");
		return -EINVAL;
	}

	if (asrc_priv->asrc_width == 16)
		buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
	else
		buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;

	config_be.direction = DMA_DEV_TO_DEV;
	config_be.src_addr_width = buswidth;
	config_be.src_maxburst = dma_params_be->maxburst;
	config_be.dst_addr_width = buswidth;
	config_be.dst_maxburst = dma_params_be->maxburst;

	if (tx) {
		config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
		config_be.dst_addr = dma_params_be->addr;
	} else {
		config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
		config_be.src_addr = dma_params_be->addr;
	}

	ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
	if (ret) {
		dev_err(dev, "failed to config DMA channel for Back-End\n");
		return ret;
	}

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	return 0;
}

static int fsl_asrc_dma_hw_free(struct snd_soc_component *component,
				struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;

	snd_pcm_set_runtime_buffer(substream, NULL);

	if (pair->dma_chan[IN])
		dma_release_channel(pair->dma_chan[IN]);

	if (pair->dma_chan[OUT])
		dma_release_channel(pair->dma_chan[OUT]);

	pair->dma_chan[IN] = NULL;
	pair->dma_chan[OUT] = NULL;

	return 0;
}

static int fsl_asrc_dma_startup(struct snd_soc_component *component,
				struct snd_pcm_substream *substream)
{
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dmaengine_dai_dma_data *dma_data;
	struct device *dev = component->dev;
	struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
	struct fsl_asrc_pair *pair;
	struct dma_chan *tmp_chan = NULL;
	u8 dir = tx ? OUT : IN;
	bool release_pair = true;
	int ret = 0;

	ret = snd_pcm_hw_constraint_integer(substream->runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0) {
		dev_err(dev, "failed to set pcm hw params periods\n");
		return ret;
	}

	pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
	if (!pair)
		return -ENOMEM;

	pair->asrc_priv = asrc_priv;

	runtime->private_data = pair;

	/* Request a dummy pair, which will be released later.
	 * Request pair function needs channel num as input, for this
	 * dummy pair, we just request "1" channel temporarily.
	 */
	ret = fsl_asrc_request_pair(1, pair);
	if (ret < 0) {
		dev_err(dev, "failed to request asrc pair\n");
		goto req_pair_err;
	}

	/* Request a dummy dma channel, which will be released later. */
	tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
	if (!tmp_chan) {
		dev_err(dev, "failed to get dma channel\n");
		ret = -EINVAL;
		goto dma_chan_err;
	}

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	/* Refine the snd_imx_hardware according to caps of DMA. */
	ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
							dma_data,
							&snd_imx_hardware,
							tmp_chan);
	if (ret < 0) {
		dev_err(dev, "failed to refine runtime hwparams\n");
		goto out;
	}

	release_pair = false;
	snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);

out:
	dma_release_channel(tmp_chan);

dma_chan_err:
	fsl_asrc_release_pair(pair);

req_pair_err:
	if (release_pair)
		kfree(pair);

	return ret;
}

static int fsl_asrc_dma_shutdown(struct snd_soc_component *component,
				 struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;
	struct fsl_asrc *asrc_priv;

	if (!pair)
		return 0;

	asrc_priv = pair->asrc_priv;

	if (asrc_priv->pair[pair->index] == pair)
		asrc_priv->pair[pair->index] = NULL;

	kfree(pair);

	return 0;
}

static snd_pcm_uframes_t
fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component,
			 struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct fsl_asrc_pair *pair = runtime->private_data;

	return bytes_to_frames(substream->runtime, pair->pos);
}

static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
				struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm_substream *substream;
	struct snd_pcm *pcm = rtd->pcm;
	int ret, i;

	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	if (ret) {
		dev_err(card->dev, "failed to set DMA mask\n");
		return ret;
	}

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
		substream = pcm->streams[i].substream;
		if (!substream)
			continue;

		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
				FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
		if (ret) {
			dev_err(card->dev, "failed to allocate DMA buffer\n");
			goto err;
		}
	}

	return 0;

err:
	if (--i == 0 && pcm->streams[i].substream)
		snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);

	return ret;
}

static void fsl_asrc_dma_pcm_free(struct snd_soc_component *component,
				  struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	int i;

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
		substream = pcm->streams[i].substream;
		if (!substream)
			continue;

		snd_dma_free_pages(&substream->dma_buffer);
		substream->dma_buffer.area = NULL;
		substream->dma_buffer.addr = 0;
	}
}

struct snd_soc_component_driver fsl_asrc_component = {
	.name		= DRV_NAME,
	.hw_params	= fsl_asrc_dma_hw_params,
	.hw_free	= fsl_asrc_dma_hw_free,
	.trigger	= fsl_asrc_dma_trigger,
	.open		= fsl_asrc_dma_startup,
	.close		= fsl_asrc_dma_shutdown,
	.pointer	= fsl_asrc_dma_pcm_pointer,
	.pcm_construct	= fsl_asrc_dma_pcm_new,
	.pcm_destruct	= fsl_asrc_dma_pcm_free,
};
EXPORT_SYMBOL_GPL(fsl_asrc_component);