summaryrefslogtreecommitdiff
path: root/sound/soc/tegra/tegra_pcm.c
blob: c7cfd96e991ef268bd7af9a43230f8197c1e617c (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
/*
 * tegra_pcm.c - Tegra PCM driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010 - NVIDIA, Inc.
 *
 * Based on code copyright/by:
 *
 * Copyright (c) 2009-2010, NVIDIA Corporation.
 * Scott Peterson <speterson@nvidia.com>
 * Vijay Mali <vmali@nvidia.com>
 *
 * Copyright (C) 2010 Google, Inc.
 * Iliyan Malchev <malchev@google.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "tegra_pcm.h"

#define DRV_NAME "tegra-pcm-audio"

static const struct snd_pcm_hardware tegra_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME |
				  SNDRV_PCM_INFO_INTERLEAVED,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.channels_min		= 2,
	.channels_max		= 2,
	.period_bytes_min	= 1024,
	.period_bytes_max	= PAGE_SIZE,
	.periods_min		= 2,
	.periods_max		= 8,
	.buffer_bytes_max	= PAGE_SIZE * 8,
	.fifo_size		= 4,
};

static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
{
	struct snd_pcm_substream *substream = prtd->substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	struct tegra_dma_req *dma_req;
	unsigned long addr;

	dma_req = &prtd->dma_req[prtd->dma_req_idx];
	prtd->dma_req_idx = 1 - prtd->dma_req_idx;

	addr = buf->addr + prtd->dma_pos;
	prtd->dma_pos += dma_req->size;
	if (prtd->dma_pos >= prtd->dma_pos_end)
		prtd->dma_pos = 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dma_req->source_addr = addr;
	else
		dma_req->dest_addr = addr;

	tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
}

static void dma_complete_callback(struct tegra_dma_req *req)
{
	struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
	struct snd_pcm_substream *substream = prtd->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;

	spin_lock(&prtd->lock);

	if (!prtd->running) {
		spin_unlock(&prtd->lock);
		return;
	}

	if (++prtd->period_index >= runtime->periods)
		prtd->period_index = 0;

	tegra_pcm_queue_dma(prtd);

	spin_unlock(&prtd->lock);

	snd_pcm_period_elapsed(substream);
}

static void setup_dma_tx_request(struct tegra_dma_req *req,
					struct tegra_pcm_dma_params * dmap)
{
	req->complete = dma_complete_callback;
	req->to_memory = false;
	req->dest_addr = dmap->addr;
	req->dest_wrap = dmap->wrap;
	req->source_bus_width = 32;
	req->source_wrap = 0;
	req->dest_bus_width = dmap->width;
	req->req_sel = dmap->req_sel;
}

static void setup_dma_rx_request(struct tegra_dma_req *req,
					struct tegra_pcm_dma_params * dmap)
{
	req->complete = dma_complete_callback;
	req->to_memory = true;
	req->source_addr = dmap->addr;
	req->dest_wrap = 0;
	req->source_bus_width = dmap->width;
	req->source_wrap = dmap->wrap;
	req->dest_bus_width = 32;
	req->req_sel = dmap->req_sel;
}

static int tegra_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct tegra_pcm_dma_params * dmap;
	int ret = 0;

	prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;

	runtime->private_data = prtd;
	prtd->substream = substream;

	spin_lock_init(&prtd->lock);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		setup_dma_tx_request(&prtd->dma_req[0], dmap);
		setup_dma_tx_request(&prtd->dma_req[1], dmap);
	} else {
		dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		setup_dma_rx_request(&prtd->dma_req[0], dmap);
		setup_dma_rx_request(&prtd->dma_req[1], dmap);
	}

	prtd->dma_req[0].dev = prtd;
	prtd->dma_req[1].dev = prtd;

	prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
	if (prtd->dma_chan == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	/* Set HW params now that initialization is complete */
	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);

	/* Ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime,
						SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto err;

	return 0;

err:
	if (prtd->dma_chan) {
		tegra_dma_free_channel(prtd->dma_chan);
	}

	kfree(prtd);

	return ret;
}

static int tegra_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;

	tegra_dma_free_channel(prtd->dma_chan);

	kfree(prtd);

	return 0;
}

static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	prtd->dma_req[0].size = params_period_bytes(params);
	prtd->dma_req[1].size = prtd->dma_req[0].size;

	return 0;
}

static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);

	return 0;
}

static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;
	unsigned long flags;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		prtd->dma_pos = 0;
		prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
		prtd->period_index = 0;
		prtd->dma_req_idx = 0;
		/* Fall-through */
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		spin_lock_irqsave(&prtd->lock, flags);
		prtd->running = 1;
		spin_unlock_irqrestore(&prtd->lock, flags);
		tegra_pcm_queue_dma(prtd);
		tegra_pcm_queue_dma(prtd);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		spin_lock_irqsave(&prtd->lock, flags);
		prtd->running = 0;
		spin_unlock_irqrestore(&prtd->lock, flags);
		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;

	return prtd->period_index * runtime->period_size;
}


static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
				struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
					runtime->dma_area,
					runtime->dma_addr,
					runtime->dma_bytes);
}

static struct snd_pcm_ops tegra_pcm_ops = {
	.open		= tegra_pcm_open,
	.close		= tegra_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= tegra_pcm_hw_params,
	.hw_free	= tegra_pcm_hw_free,
	.trigger	= tegra_pcm_trigger,
	.pointer	= tegra_pcm_pointer,
	.mmap		= tegra_pcm_mmap,
};

static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size = tegra_pcm_hardware.buffer_bytes_max;

	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
						&buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->bytes = size;

	return 0;
}

static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;

	substream = pcm->streams[stream].substream;
	if (!substream)
		return;

	buf = &substream->dma_buffer;
	if (!buf->area)
		return;

	dma_free_writecombine(pcm->card->dev, buf->bytes,
				buf->area, buf->addr);
	buf->area = NULL;
}

static u64 tegra_dma_mask = DMA_BIT_MASK(32);

static int tegra_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct snd_pcm *pcm = rtd->pcm;
	int ret = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &tegra_dma_mask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = 0xffffffff;

	if (dai->driver->playback.channels_min) {
		ret = tegra_pcm_preallocate_dma_buffer(pcm,
						SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto err;
	}

	if (dai->driver->capture.channels_min) {
		ret = tegra_pcm_preallocate_dma_buffer(pcm,
						SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto err_free_play;
	}

	return 0;

err_free_play:
	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
err:
	return ret;
}

static void tegra_pcm_free(struct snd_pcm *pcm)
{
	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
}

struct snd_soc_platform_driver tegra_pcm_platform = {
	.ops		= &tegra_pcm_ops,
	.pcm_new	= tegra_pcm_new,
	.pcm_free	= tegra_pcm_free,
};

static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
}

static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver tegra_pcm_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
	.probe = tegra_pcm_platform_probe,
	.remove = __devexit_p(tegra_pcm_platform_remove),
};

static int __init snd_tegra_pcm_init(void)
{
	return platform_driver_register(&tegra_pcm_driver);
}
module_init(snd_tegra_pcm_init);

static void __exit snd_tegra_pcm_exit(void)
{
	platform_driver_unregister(&tegra_pcm_driver);
}
module_exit(snd_tegra_pcm_exit);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra PCM ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);