aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/kirkwood/kirkwood-i2s.c
blob: 1d5db484d2df331b15e8e385cd32e2acd79e4d79 (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
/*
 * kirkwood-i2s.c
 *
 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 *  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;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mbus.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/platform_data/asoc-kirkwood.h>
#include "kirkwood.h"

#define DRV_NAME	"kirkwood-i2s"

#define KIRKWOOD_I2S_RATES \
	(SNDRV_PCM_RATE_44100 | \
	 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
#define KIRKWOOD_I2S_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE | \
	 SNDRV_PCM_FMTBIT_S24_LE | \
	 SNDRV_PCM_FMTBIT_S32_LE)

static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
		unsigned int fmt)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
	unsigned long mask;
	unsigned long value;

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
		mask = KIRKWOOD_I2S_CTL_RJ;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		mask = KIRKWOOD_I2S_CTL_LJ;
		break;
	case SND_SOC_DAIFMT_I2S:
		mask = KIRKWOOD_I2S_CTL_I2S;
		break;
	default:
		return -EINVAL;
	}

	/*
	 * Set same format for playback and record
	 * This avoids some troubles.
	 */
	value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	value |= mask;
	writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);

	value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	value |= mask;
	writel(value, priv->io+KIRKWOOD_I2S_RECCTL);

	return 0;
}

static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
{
	unsigned long value;

	value = KIRKWOOD_DCO_CTL_OFFSET_0;
	switch (rate) {
	default:
	case 44100:
		value |= KIRKWOOD_DCO_CTL_FREQ_11;
		break;
	case 48000:
		value |= KIRKWOOD_DCO_CTL_FREQ_12;
		break;
	case 96000:
		value |= KIRKWOOD_DCO_CTL_FREQ_24;
		break;
	}
	writel(value, io + KIRKWOOD_DCO_CTL);

	/* wait for dco locked */
	do {
		cpu_relax();
		value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
		value &= KIRKWOOD_DCO_SPCR_STATUS_DCO_LOCK;
	} while (value == 0);
}

static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_set_dma_data(dai, substream, priv);
	return 0;
}

static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned int i2s_reg, reg;
	unsigned long i2s_value, value;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		i2s_reg = KIRKWOOD_I2S_PLAYCTL;
		reg = KIRKWOOD_PLAYCTL;
	} else {
		i2s_reg = KIRKWOOD_I2S_RECCTL;
		reg = KIRKWOOD_RECCTL;
	}

	/* set dco conf */
	kirkwood_set_dco(priv->io, params_rate(params));

	i2s_value = readl(priv->io+i2s_reg);
	i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;

	value = readl(priv->io+reg);
	value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;

	/*
	 * Size settings in play/rec i2s control regs and play/rec control
	 * regs must be the same.
	 */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
		value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
		break;
	/*
	 * doesn't work... S20_3LE != kirkwood 20bit format ?
	 *
	case SNDRV_PCM_FORMAT_S20_3LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
		value |= KIRKWOOD_PLAYCTL_SIZE_20;
		break;
	*/
	case SNDRV_PCM_FORMAT_S24_LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
		value |= KIRKWOOD_PLAYCTL_SIZE_24;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
		value |= KIRKWOOD_PLAYCTL_SIZE_32;
		break;
	default:
		return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
		if (params_channels(params) == 1)
			value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
		else
			value |= KIRKWOOD_PLAYCTL_MONO_OFF;
	}

	writel(i2s_value, priv->io+i2s_reg);
	writel(value, priv->io+reg);

	return 0;
}

static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
				int cmd, struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	uint32_t ctl, value;

	ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
	if (ctl & KIRKWOOD_PLAYCTL_PAUSE) {
		unsigned timeout = 5000;
		/*
		 * The Armada510 spec says that if we enter pause mode, the
		 * busy bit must be read back as clear _twice_.  Make sure
		 * we respect that otherwise we get DMA underruns.
		 */
		do {
			value = ctl;
			ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
			if (!((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY))
				break;
			udelay(1);
		} while (timeout--);

		if ((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY)
			dev_notice(dai->dev, "timed out waiting for busy to deassert: %08x\n",
				   ctl);
	}

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* configure audio & enable i2s playback */
		ctl &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
		ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE
				| KIRKWOOD_PLAYCTL_SPDIF_EN);

		if (priv->burst == 32)
			ctl |= KIRKWOOD_PLAYCTL_BURST_32;
		else
			ctl |= KIRKWOOD_PLAYCTL_BURST_128;
		ctl |= KIRKWOOD_PLAYCTL_I2S_EN;
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		/* stop audio, disable interrupts */
		ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);

		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* disable all playbacks */
		ctl &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
				int cmd, struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned long value;

	value = readl(priv->io + KIRKWOOD_RECCTL);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* configure audio & enable i2s record */
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value &= ~KIRKWOOD_RECCTL_BURST_MASK;
		value &= ~KIRKWOOD_RECCTL_MONO;
		value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE
			| KIRKWOOD_RECCTL_SPDIF_EN);

		if (priv->burst == 32)
			value |= KIRKWOOD_RECCTL_BURST_32;
		else
			value |= KIRKWOOD_RECCTL_BURST_128;
		value |= KIRKWOOD_RECCTL_I2S_EN;

		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		/* stop audio, disable interrupts */
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
		writel(value, priv->io + KIRKWOOD_RECCTL);

		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* disable all records */
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			       struct snd_soc_dai *dai)
{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return kirkwood_i2s_play_trigger(substream, cmd, dai);
	else
		return kirkwood_i2s_rec_trigger(substream, cmd, dai);

	return 0;
}

static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned long value;
	unsigned int reg_data;

	/* put system in a "safe" state : */
	/* disable audio interrupts */
	writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
	writel(0, priv->io + KIRKWOOD_INT_MASK);

	reg_data = readl(priv->io + 0x1200);
	reg_data &= (~(0x333FF8));
	reg_data |= 0x111D18;
	writel(reg_data, priv->io + 0x1200);

	msleep(500);

	reg_data = readl(priv->io + 0x1200);
	reg_data &= (~(0x333FF8));
	reg_data |= 0x111D18;
	writel(reg_data, priv->io + 0x1200);

	/* disable playback/record */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_PLAYCTL);

	value = readl(priv->io + KIRKWOOD_RECCTL);
	value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_RECCTL);

	return 0;

}

static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
{
	return 0;
}

static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
	.startup	= kirkwood_i2s_startup,
	.trigger	= kirkwood_i2s_trigger,
	.hw_params      = kirkwood_i2s_hw_params,
	.set_fmt        = kirkwood_i2s_set_fmt,
};


static struct snd_soc_dai_driver kirkwood_i2s_dai = {
	.probe = kirkwood_i2s_probe,
	.remove = kirkwood_i2s_remove,
	.playback = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = KIRKWOOD_I2S_RATES,
		.formats = KIRKWOOD_I2S_FORMATS,},
	.capture = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = KIRKWOOD_I2S_RATES,
		.formats = KIRKWOOD_I2S_FORMATS,},
	.ops = &kirkwood_i2s_dai_ops,
};

static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
{
	struct resource *mem;
	struct kirkwood_asoc_platform_data *data =
		pdev->dev.platform_data;
	struct kirkwood_dma_data *priv;
	int err;

	priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
	if (!priv) {
		dev_err(&pdev->dev, "allocation failed\n");
		err = -ENOMEM;
		goto error;
	}
	dev_set_drvdata(&pdev->dev, priv);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "platform_get_resource failed\n");
		err = -ENXIO;
		goto err_alloc;
	}

	priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
	if (!priv->mem) {
		dev_err(&pdev->dev, "request_mem_region failed\n");
		err = -EBUSY;
		goto err_alloc;
	}

	priv->io = ioremap(priv->mem->start, SZ_16K);
	if (!priv->io) {
		dev_err(&pdev->dev, "ioremap failed\n");
		err = -ENOMEM;
		goto err_iomem;
	}

	priv->irq = platform_get_irq(pdev, 0);
	if (priv->irq <= 0) {
		dev_err(&pdev->dev, "platform_get_irq failed\n");
		err = -ENXIO;
		goto err_ioremap;
	}

	if (!data) {
		dev_err(&pdev->dev, "no platform data ?!\n");
		err = -EINVAL;
		goto err_ioremap;
	}

	priv->burst = data->burst;

	priv->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "no clock\n");
		err = PTR_ERR(priv->clk);
		goto err_ioremap;
	}
	clk_prepare_enable(priv->clk);

	err = snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);
	if (!err)
		return 0;
	dev_err(&pdev->dev, "snd_soc_register_dai failed\n");

	clk_disable_unprepare(priv->clk);
	clk_put(priv->clk);

err_ioremap:
	iounmap(priv->io);
err_iomem:
	release_mem_region(priv->mem->start, SZ_16K);
err_alloc:
	kfree(priv);
error:
	return err;
}

static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
{
	struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_dai(&pdev->dev);

	clk_disable_unprepare(priv->clk);
	clk_put(priv->clk);

	iounmap(priv->io);
	release_mem_region(priv->mem->start, SZ_16K);
	kfree(priv);

	return 0;
}

static struct platform_driver kirkwood_i2s_driver = {
	.probe  = kirkwood_i2s_dev_probe,
	.remove = __devexit_p(kirkwood_i2s_dev_remove),
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
};

module_platform_driver(kirkwood_i2s_driver);

/* Module information */
MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kirkwood-i2s");