aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/fsl/mpc5200_dma.c
blob: 30ed568afb2ef5c24316e1fe1ae24c34a795adac (plain) (blame)
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
/*
 * Freescale MPC5200 PSC DMA
 * ALSA SoC Platform driver
 *
 * Copyright (C) 2008 Secret Lab Technologies Ltd.
 * Copyright (C) 2009 Jon Smirl, Digispeaker
 */

#include <linux/module.h>
#include <linux/of_device.h>

#include <sound/soc.h>

#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/gen_bd.h>
#include <asm/mpc52xx_psc.h>

#include "mpc5200_dma.h"

/*
 * Interrupt handlers
 */
static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
{
	struct psc_dma *psc_dma = _psc_dma;
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	u16 isr;

	isr = in_be16(&regs->mpc52xx_psc_isr);

	/* Playback underrun error */
	if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
		psc_dma->stats.underrun_count++;

	/* Capture overrun error */
	if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
		psc_dma->stats.overrun_count++;

	out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);

	return IRQ_HANDLED;
}

/**
 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
 * @s: pointer to stream private data structure
 *
 * Enqueues another audio period buffer into the bestcomm queue.
 *
 * Note: The routine must only be called when there is space available in
 * the queue.  Otherwise the enqueue will fail and the audio ring buffer
 * will get out of sync
 */
static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
{
	struct bcom_bd *bd;

	/* Prepare and enqueue the next buffer descriptor */
	bd = bcom_prepare_next_buffer(s->bcom_task);
	bd->status = s->period_bytes;
	bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
	bcom_submit_next_buffer(s->bcom_task, NULL);

	/* Update for next period */
	s->period_next = (s->period_next + 1) % s->runtime->periods;
}

/* Bestcomm DMA irq handler */
static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
{
	struct psc_dma_stream *s = _psc_dma_stream;

	spin_lock(&s->psc_dma->lock);
	/* For each finished period, dequeue the completed period buffer
	 * and enqueue a new one in it's place. */
	while (bcom_buffer_done(s->bcom_task)) {
		bcom_retrieve_buffer(s->bcom_task, NULL, NULL);

		s->period_current = (s->period_current+1) % s->runtime->periods;
		s->period_count++;

		psc_dma_bcom_enqueue_next_buffer(s);
	}
	spin_unlock(&s->psc_dma->lock);

	/* If the stream is active, then also inform the PCM middle layer
	 * of the period finished event. */
	if (s->active)
		snd_pcm_period_elapsed(s->stream);

	return IRQ_HANDLED;
}

static int psc_dma_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}

/**
 * psc_dma_trigger: start and stop the DMA transfer.
 *
 * This function is called by ALSA to start, stop, pause, and resume the DMA
 * transfer of data.
 */
static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	u16 imr;
	unsigned long flags;
	int i;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
			substream->pstr->stream, runtime->frame_bits,
			(int)runtime->period_size, runtime->periods);
		s->period_bytes = frames_to_bytes(runtime,
						  runtime->period_size);
		s->period_next = 0;
		s->period_current = 0;
		s->active = 1;
		s->period_count = 0;
		s->runtime = runtime;

		/* Fill up the bestcomm bd queue and enable DMA.
		 * This will begin filling the PSC's fifo.
		 */
		spin_lock_irqsave(&psc_dma->lock, flags);

		if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
			bcom_gen_bd_rx_reset(s->bcom_task);
		else
			bcom_gen_bd_tx_reset(s->bcom_task);

		for (i = 0; i < runtime->periods; i++)
			if (!bcom_queue_full(s->bcom_task))
				psc_dma_bcom_enqueue_next_buffer(s);

		bcom_enable(s->bcom_task);
		spin_unlock_irqrestore(&psc_dma->lock, flags);

		out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);

		break;

	case SNDRV_PCM_TRIGGER_STOP:
		dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
			substream->pstr->stream, s->period_count);
		s->active = 0;

		spin_lock_irqsave(&psc_dma->lock, flags);
		bcom_disable(s->bcom_task);
		if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
			bcom_gen_bd_rx_reset(s->bcom_task);
		else
			bcom_gen_bd_tx_reset(s->bcom_task);
		spin_unlock_irqrestore(&psc_dma->lock, flags);

		break;

	default:
		dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
			substream->pstr->stream, cmd);
		return -EINVAL;
	}

	/* Update interrupt enable settings */
	imr = 0;
	if (psc_dma->playback.active)
		imr |= MPC52xx_PSC_IMR_TXEMP;
	if (psc_dma->capture.active)
		imr |= MPC52xx_PSC_IMR_ORERR;
	out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);

	return 0;
}


/* ---------------------------------------------------------------------
 * The PSC DMA 'ASoC platform' driver
 *
 * Can be referenced by an 'ASoC machine' driver
 * This driver only deals with the audio bus; it doesn't have any
 * interaction with the attached codec
 */

static const struct snd_pcm_hardware psc_dma_hardware = {
	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_BATCH,
	.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
		SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.period_bytes_max	= 1024 * 1024,
	.period_bytes_min	= 32,
	.periods_min		= 2,
	.periods_max		= 256,
	.buffer_bytes_max	= 2 * 1024 * 1024,
	.fifo_size		= 512,
};

static int psc_dma_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct psc_dma_stream *s;
	int rc;

	dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);

	rc = snd_pcm_hw_constraint_integer(runtime,
		SNDRV_PCM_HW_PARAM_PERIODS);
	if (rc < 0) {
		dev_err(substream->pcm->card->dev, "invalid buffer size\n");
		return rc;
	}

	s->stream = substream;
	return 0;
}

static int psc_dma_close(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct psc_dma_stream *s;

	dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	if (!psc_dma->playback.active &&
	    !psc_dma->capture.active) {

		/* Disable all interrupts and reset the PSC */
		out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
		out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
	}
	s->stream = NULL;
	return 0;
}

static snd_pcm_uframes_t
psc_dma_pointer(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct psc_dma_stream *s;
	dma_addr_t count;

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	count = s->period_current * s->period_bytes;

	return bytes_to_frames(substream->runtime, count);
}

static int
psc_dma_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params)
{
	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	return 0;
}

static struct snd_pcm_ops psc_dma_ops = {
	.open		= psc_dma_open,
	.close		= psc_dma_close,
	.hw_free	= psc_dma_hw_free,
	.ioctl		= snd_pcm_lib_ioctl,
	.pointer	= psc_dma_pointer,
	.trigger	= psc_dma_trigger,
	.hw_params	= psc_dma_hw_params,
};

static u64 psc_dma_dmamask = 0xffffffff;
static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
			   struct snd_pcm *pcm)
{
	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	size_t size = psc_dma_hardware.buffer_bytes_max;
	int rc = 0;

	dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
		card, dai, pcm);

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

	if (pcm->streams[0].substream) {
		rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
				size, &pcm->streams[0].substream->dma_buffer);
		if (rc)
			goto playback_alloc_err;
	}

	if (pcm->streams[1].substream) {
		rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
				size, &pcm->streams[1].substream->dma_buffer);
		if (rc)
			goto capture_alloc_err;
	}

	if (rtd->socdev->card->codec->ac97)
		rtd->socdev->card->codec->ac97->private_data = psc_dma;

	return 0;

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

 playback_alloc_err:
	dev_err(card->dev, "Cannot allocate buffer(s)\n");

	return -ENOMEM;
}

static void psc_dma_free(struct snd_pcm *pcm)
{
	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
	struct snd_pcm_substream *substream;
	int stream;

	dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm);

	for (stream = 0; stream < 2; stream++) {
		substream = pcm->streams[stream].substream;
		if (substream) {
			snd_dma_free_pages(&substream->dma_buffer);
			substream->dma_buffer.area = NULL;
			substream->dma_buffer.addr = 0;
		}
	}
}

struct snd_soc_platform mpc5200_audio_dma_platform = {
	.name		= "mpc5200-psc-audio",
	.pcm_ops	= &psc_dma_ops,
	.pcm_new	= &psc_dma_new,
	.pcm_free	= &psc_dma_free,
};
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform);

int mpc5200_audio_dma_create(struct of_device *op)
{
	phys_addr_t fifo;
	struct psc_dma *psc_dma;
	struct resource res;
	int size, irq, rc;
	const __be32 *prop;
	void __iomem *regs;
	int ret;

	/* Fetch the registers and IRQ of the PSC */
	irq = irq_of_parse_and_map(op->node, 0);
	if (of_address_to_resource(op->node, 0, &res)) {
		dev_err(&op->dev, "Missing reg property\n");
		return -ENODEV;
	}
	regs = ioremap(res.start, 1 + res.end - res.start);
	if (!regs) {
		dev_err(&op->dev, "Could not map registers\n");
		return -ENODEV;
	}

	/* Allocate and initialize the driver private data */
	psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
	if (!psc_dma) {
		ret = -ENOMEM;
		goto out_unmap;
	}

	/* Get the PSC ID */
	prop = of_get_property(op->node, "cell-index", &size);
	if (!prop || size < sizeof *prop) {
		ret = -ENODEV;
		goto out_free;
	}

	spin_lock_init(&psc_dma->lock);
	mutex_init(&psc_dma->mutex);
	psc_dma->id = be32_to_cpu(*prop);
	psc_dma->irq = irq;
	psc_dma->psc_regs = regs;
	psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
	psc_dma->dev = &op->dev;
	psc_dma->playback.psc_dma = psc_dma;
	psc_dma->capture.psc_dma = psc_dma;
	snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);

	/* Find the address of the fifo data registers and setup the
	 * DMA tasks */
	fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
	psc_dma->capture.bcom_task =
		bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
	psc_dma->playback.bcom_task =
		bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
	if (!psc_dma->capture.bcom_task ||
	    !psc_dma->playback.bcom_task) {
		dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
		ret = -ENODEV;
		goto out_free;
	}

	/* Disable all interrupts and reset the PSC */
	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
	 /* reset receiver */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
	 /* reset transmitter */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
	 /* reset error */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
	 /* reset mode */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);

	/* Set up mode register;
	 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
	 * Second write: register Normal mode for non loopback
	 */
	out_8(&psc_dma->psc_regs->mode, 0);
	out_8(&psc_dma->psc_regs->mode, 0);

	/* Set the TX and RX fifo alarm thresholds */
	out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
	out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
	out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
	out_8(&psc_dma->fifo_regs->tfcntl, 0x7);

	/* Lookup the IRQ numbers */
	psc_dma->playback.irq =
		bcom_get_task_irq(psc_dma->playback.bcom_task);
	psc_dma->capture.irq =
		bcom_get_task_irq(psc_dma->capture.bcom_task);

	rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
			 "psc-dma-status", psc_dma);
	rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
			  "psc-dma-capture", &psc_dma->capture);
	rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
			  "psc-dma-playback", &psc_dma->playback);
	if (rc) {
		ret = -ENODEV;
		goto out_irq;
	}

	/* Save what we've done so it can be found again later */
	dev_set_drvdata(&op->dev, psc_dma);

	/* Tell the ASoC OF helpers about it */
	return snd_soc_register_platform(&mpc5200_audio_dma_platform);
out_irq:
	free_irq(psc_dma->irq, psc_dma);
	free_irq(psc_dma->capture.irq, &psc_dma->capture);
	free_irq(psc_dma->playback.irq, &psc_dma->playback);
out_free:
	kfree(psc_dma);
out_unmap:
	iounmap(regs);
	return ret;
}
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);

int mpc5200_audio_dma_destroy(struct of_device *op)
{
	struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);

	dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");

	snd_soc_unregister_platform(&mpc5200_audio_dma_platform);

	bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
	bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);

	/* Release irqs */
	free_irq(psc_dma->irq, psc_dma);
	free_irq(psc_dma->capture.irq, &psc_dma->capture);
	free_irq(psc_dma->playback.irq, &psc_dma->playback);

	iounmap(psc_dma->psc_regs);
	kfree(psc_dma);
	dev_set_drvdata(&op->dev, NULL);

	return 0;
}
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
MODULE_LICENSE("GPL");