summaryrefslogtreecommitdiffstats
path: root/sound/soc/s6000/s6000-pcm.c
blob: fb8461e1b1f6664c2aa151b96661c4103fbd61bd (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
/*
 * ALSA PCM interface for the Stetch s6000 family
 *
 * Author:      Daniel Gloeckner, <dg@emlix.com>
 * Copyright:   (C) 2009 emlix GmbH <info@emlix.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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <asm/dma.h>
#include <variant/dmac.h>

#include "s6000-pcm.h"

#define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
#define S6_PCM_PREALLOCATE_MAX  (2048 * 1024)

static struct snd_pcm_hardware s6000_pcm_hardware = {
	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
		 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_JOINT_DUPLEX),
	.buffer_bytes_max = 0x7ffffff0,
	.period_bytes_min = 16,
	.period_bytes_max = 0xfffff0,
	.periods_min = 2,
	.periods_max = 1024, /* no limit */
	.fifo_size = 0,
};

struct s6000_runtime_data {
	spinlock_t lock;
	int period;		/* current DMA period */
};

static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s6000_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	int channel;
	unsigned int period_size;
	unsigned int dma_offset;
	dma_addr_t dma_pos;
	dma_addr_t src, dst;

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	period_size = snd_pcm_lib_period_bytes(substream);
	dma_offset = prtd->period * period_size;
	dma_pos = runtime->dma_addr + dma_offset;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		src = dma_pos;
		dst = par->sif_out;
		channel = par->dma_out;
	} else {
		src = par->sif_in;
		dst = dma_pos;
		channel = par->dma_in;
	}

	if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
				    DMA_INDEX_CHNL(channel)))
		return;

	if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
		printk(KERN_ERR "s6000-pcm: fifo full\n");
		return;
	}

	if (WARN_ON(period_size & 15))
		return;
	s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
			src, dst, period_size);

	prtd->period++;
	if (unlikely(prtd->period >= runtime->periods))
		prtd->period = 0;
}

static irqreturn_t s6000_pcm_irq(int irq, void *data)
{
	struct snd_pcm *pcm = data;
	struct snd_soc_pcm_runtime *runtime = pcm->private_data;
	struct s6000_runtime_data *prtd;
	unsigned int has_xrun;
	int i, ret = IRQ_NONE;

	for (i = 0; i < 2; ++i) {
		struct snd_pcm_substream *substream = pcm->streams[i].substream;
		struct s6000_pcm_dma_params *params =
					snd_soc_dai_get_dma_data(runtime->cpu_dai, substream);
		u32 channel;
		unsigned int pending;

		if (substream == SNDRV_PCM_STREAM_PLAYBACK)
			channel = params->dma_out;
		else
			channel = params->dma_in;

		has_xrun = params->check_xrun(runtime->cpu_dai);

		if (!channel)
			continue;

		if (unlikely(has_xrun & (1 << i)) &&
		    substream->runtime &&
		    snd_pcm_running(substream)) {
			dev_dbg(pcm->dev, "xrun\n");
			snd_pcm_stream_lock(substream);
			snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
			snd_pcm_stream_unlock(substream);
			ret = IRQ_HANDLED;
		}

		pending = s6dmac_int_sources(DMA_MASK_DMAC(channel),
					     DMA_INDEX_CHNL(channel));

		if (pending & 1) {
			ret = IRQ_HANDLED;
			if (likely(substream->runtime &&
				   snd_pcm_running(substream))) {
				snd_pcm_period_elapsed(substream);
				dev_dbg(pcm->dev, "period elapsed %x %x\n",
				       s6dmac_cur_src(DMA_MASK_DMAC(channel),
						   DMA_INDEX_CHNL(channel)),
				       s6dmac_cur_dst(DMA_MASK_DMAC(channel),
						   DMA_INDEX_CHNL(channel)));
				prtd = substream->runtime->private_data;
				spin_lock(&prtd->lock);
				s6000_pcm_enqueue_dma(substream);
				spin_unlock(&prtd->lock);
			}
		}

		if (unlikely(pending & ~7)) {
			if (pending & (1 << 3))
				printk(KERN_WARNING
				       "s6000-pcm: DMA %x Underflow\n",
				       channel);
			if (pending & (1 << 4))
				printk(KERN_WARNING
				       "s6000-pcm: DMA %x Overflow\n",
				       channel);
			if (pending & 0x1e0)
				printk(KERN_WARNING
				       "s6000-pcm: DMA %x Master Error "
				       "(mask %x)\n",
				       channel, pending >> 5);

		}
	}

	return ret;
}

static int s6000_pcm_start(struct snd_pcm_substream *substream)
{
	struct s6000_runtime_data *prtd = substream->runtime->private_data;
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	unsigned long flags;
	int srcinc;
	u32 dma;

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	spin_lock_irqsave(&prtd->lock, flags);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		srcinc = 1;
		dma = par->dma_out;
	} else {
		srcinc = 0;
		dma = par->dma_in;
	}
	s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
			   1 /* priority 1 (0 is max) */,
			   0 /* peripheral requests w/o xfer length mode */,
			   srcinc /* source address increment */,
			   srcinc^1 /* destination address increment */,
			   0 /* chunksize 0 (skip impossible on this dma) */,
			   0 /* source skip after chunk (impossible) */,
			   0 /* destination skip after chunk (impossible) */,
			   4 /* 16 byte burst size */,
			   -1 /* don't conserve bandwidth */,
			   0 /* low watermark irq descriptor threshold */,
			   0 /* disable hardware timestamps */,
			   1 /* enable channel */);

	s6000_pcm_enqueue_dma(substream);
	s6000_pcm_enqueue_dma(substream);

	spin_unlock_irqrestore(&prtd->lock, flags);

	return 0;
}

static int s6000_pcm_stop(struct snd_pcm_substream *substream)
{
	struct s6000_runtime_data *prtd = substream->runtime->private_data;
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	unsigned long flags;
	u32 channel;

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		channel = par->dma_out;
	else
		channel = par->dma_in;

	s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
				  DMA_INDEX_CHNL(channel), 0);

	spin_lock_irqsave(&prtd->lock, flags);

	s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));

	spin_unlock_irqrestore(&prtd->lock, flags);

	return 0;
}

static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	int ret;

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	ret = par->trigger(substream, cmd, 0);
	if (ret < 0)
		return ret;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ret = s6000_pcm_start(substream);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		ret = s6000_pcm_stop(substream);
		break;
	default:
		ret = -EINVAL;
	}
	if (ret < 0)
		return ret;

	return par->trigger(substream, cmd, 1);
}

static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct s6000_runtime_data *prtd = substream->runtime->private_data;

	prtd->period = 0;

	return 0;
}

static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s6000_runtime_data *prtd = runtime->private_data;
	unsigned long flags;
	unsigned int offset;
	dma_addr_t count;

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	spin_lock_irqsave(&prtd->lock, flags);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
				       DMA_INDEX_CHNL(par->dma_out));
	else
		count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
				       DMA_INDEX_CHNL(par->dma_in));

	count -= runtime->dma_addr;

	spin_unlock_irqrestore(&prtd->lock, flags);

	offset = bytes_to_frames(runtime, count);
	if (unlikely(offset >= runtime->buffer_size))
		offset = 0;

	return offset;
}

static int s6000_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s6000_runtime_data *prtd;
	int ret;

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
	snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);

	ret = snd_pcm_hw_constraint_step(runtime, 0,
					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
	if (ret < 0)
		return ret;
	ret = snd_pcm_hw_constraint_step(runtime, 0,
					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
	if (ret < 0)
		return ret;
	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		return ret;

	if (par->same_rate) {
		int rate;
		spin_lock(&par->lock); /* needed? */
		rate = par->rate;
		spin_unlock(&par->lock);
		if (rate != -1) {
			ret = snd_pcm_hw_constraint_minmax(runtime,
							SNDRV_PCM_HW_PARAM_RATE,
							rate, rate);
			if (ret < 0)
				return ret;
		}
	}

	prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;

	spin_lock_init(&prtd->lock);

	runtime->private_data = prtd;

	return 0;
}

static int s6000_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct s6000_runtime_data *prtd = runtime->private_data;

	kfree(prtd);

	return 0;
}

static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par;
	int ret;
	ret = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0) {
		printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
		return ret;
	}

	par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	if (par->same_rate) {
		spin_lock(&par->lock);
		if (par->rate == -1 ||
		    !(par->in_use & ~(1 << substream->stream))) {
			par->rate = params_rate(hw_params);
			par->in_use |= 1 << substream->stream;
		} else if (params_rate(hw_params) != par->rate) {
			snd_pcm_lib_free_pages(substream);
			par->in_use &= ~(1 << substream->stream);
			ret = -EBUSY;
		}
		spin_unlock(&par->lock);
	}
	return ret;
}

static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct s6000_pcm_dma_params *par =
		snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);

	spin_lock(&par->lock);
	par->in_use &= ~(1 << substream->stream);
	if (!par->in_use)
		par->rate = -1;
	spin_unlock(&par->lock);

	return snd_pcm_lib_free_pages(substream);
}

static struct snd_pcm_ops s6000_pcm_ops = {
	.open = 	s6000_pcm_open,
	.close = 	s6000_pcm_close,
	.ioctl = 	snd_pcm_lib_ioctl,
	.hw_params = 	s6000_pcm_hw_params,
	.hw_free = 	s6000_pcm_hw_free,
	.trigger =	s6000_pcm_trigger,
	.prepare = 	s6000_pcm_prepare,
	.pointer = 	s6000_pcm_pointer,
};

static void s6000_pcm_free(struct snd_pcm *pcm)
{
	struct snd_soc_pcm_runtime *runtime = pcm->private_data;
	struct s6000_pcm_dma_params *params =
		snd_soc_dai_get_dma_data(runtime->cpu_dai,
			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);

	free_irq(params->irq, pcm);
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static int s6000_pcm_new(struct snd_soc_pcm_runtime *runtime)
{
	struct snd_card *card = runtime->card->snd_card;
	struct snd_pcm *pcm = runtime->pcm;
	struct s6000_pcm_dma_params *params;
	int res;

	params = snd_soc_dai_get_dma_data(runtime->cpu_dai,
			pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);

	res = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	if (res)
		return res;

	if (params->dma_in) {
		s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
				    DMA_INDEX_CHNL(params->dma_in));
		s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
				   DMA_INDEX_CHNL(params->dma_in));
	}

	if (params->dma_out) {
		s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
				    DMA_INDEX_CHNL(params->dma_out));
		s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
				   DMA_INDEX_CHNL(params->dma_out));
	}

	res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
			  "s6000-audio", pcm);
	if (res) {
		printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
		return res;
	}

	res = snd_pcm_lib_preallocate_pages_for_all(pcm,
						    SNDRV_DMA_TYPE_DEV,
						    card->dev,
						    S6_PCM_PREALLOCATE_SIZE,
						    S6_PCM_PREALLOCATE_MAX);
	if (res)
		printk(KERN_WARNING "s6000-pcm: preallocation failed\n");

	spin_lock_init(&params->lock);
	params->in_use = 0;
	params->rate = -1;
	return 0;
}

static struct snd_soc_platform_driver s6000_soc_platform = {
	.ops =		&s6000_pcm_ops,
	.pcm_new = 	s6000_pcm_new,
	.pcm_free = 	s6000_pcm_free,
};

static int s6000_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &s6000_soc_platform);
}

static int s6000_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver s6000_pcm_driver = {
	.driver = {
			.name = "s6000-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = s6000_soc_platform_probe,
	.remove = s6000_soc_platform_remove,
};

module_platform_driver(s6000_pcm_driver);

MODULE_AUTHOR("Daniel Gloeckner");
MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud