summaryrefslogtreecommitdiff
path: root/sound/soc/ep93xx/ep93xx-i2s.c
blob: 3dba128cc6f137a35ab949245e4cbd87075557b3 (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
/*
 * linux/sound/soc/ep93xx-i2s.c
 * EP93xx I2S driver
 *
 * Copyright (C) 2010 Ryan Mallon
 *
 * Based on the original driver by:
 *   Copyright (C) 2007 Chase Douglas <chasedouglas@gmail>
 *   Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
 *
 * 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/slab.h>
#include <linux/clk.h>
#include <linux/io.h>

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

#include <mach/hardware.h>
#include <mach/ep93xx-regs.h>
#include <mach/dma.h>

#include "ep93xx-pcm.h"

#define EP93XX_I2S_TXCLKCFG		0x00
#define EP93XX_I2S_RXCLKCFG		0x04
#define EP93XX_I2S_GLCTRL		0x0C

#define EP93XX_I2S_TXLINCTRLDATA	0x28
#define EP93XX_I2S_TXCTRL		0x2C
#define EP93XX_I2S_TXWRDLEN		0x30
#define EP93XX_I2S_TX0EN		0x34

#define EP93XX_I2S_RXLINCTRLDATA	0x58
#define EP93XX_I2S_RXCTRL		0x5C
#define EP93XX_I2S_RXWRDLEN		0x60
#define EP93XX_I2S_RX0EN		0x64

#define EP93XX_I2S_WRDLEN_16		(0 << 0)
#define EP93XX_I2S_WRDLEN_24		(1 << 0)
#define EP93XX_I2S_WRDLEN_32		(2 << 0)

#define EP93XX_I2S_LINCTRLDATA_R_JUST	(1 << 2) /* Right justify */

#define EP93XX_I2S_CLKCFG_LRS		(1 << 0) /* lrclk polarity */
#define EP93XX_I2S_CLKCFG_CKP		(1 << 1) /* Bit clock polarity */
#define EP93XX_I2S_CLKCFG_REL		(1 << 2) /* First bit transition */
#define EP93XX_I2S_CLKCFG_MASTER	(1 << 3) /* Master mode */
#define EP93XX_I2S_CLKCFG_NBCG		(1 << 4) /* Not bit clock gating */

struct ep93xx_i2s_info {
	struct clk			*mclk;
	struct clk			*sclk;
	struct clk			*lrclk;
	struct ep93xx_pcm_dma_params	*dma_params;
	struct resource			*mem;
	void __iomem			*regs;
};

struct ep93xx_pcm_dma_params ep93xx_i2s_dma_params[] = {
	[SNDRV_PCM_STREAM_PLAYBACK] = {
		.name		= "i2s-pcm-out",
		.dma_port	= EP93XX_DMA_I2S1,
	},
	[SNDRV_PCM_STREAM_CAPTURE] = {
		.name		= "i2s-pcm-in",
		.dma_port	= EP93XX_DMA_I2S1,
	},
};

static inline void ep93xx_i2s_write_reg(struct ep93xx_i2s_info *info,
					unsigned reg, unsigned val)
{
	__raw_writel(val, info->regs + reg);
}

static inline unsigned ep93xx_i2s_read_reg(struct ep93xx_i2s_info *info,
					   unsigned reg)
{
	return __raw_readl(info->regs + reg);
}

static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream)
{
	unsigned base_reg;
	int i;

	if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
	    (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
		/* Enable clocks */
		clk_enable(info->mclk);
		clk_enable(info->sclk);
		clk_enable(info->lrclk);

		/* Enable i2s */
		ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 1);
	}

	/* Enable fifos */
	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		base_reg = EP93XX_I2S_TX0EN;
	else
		base_reg = EP93XX_I2S_RX0EN;
	for (i = 0; i < 3; i++)
		ep93xx_i2s_write_reg(info, base_reg + (i * 4), 1);
}

static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream)
{
	unsigned base_reg;
	int i;

	/* Disable fifos */
	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		base_reg = EP93XX_I2S_TX0EN;
	else
		base_reg = EP93XX_I2S_RX0EN;
	for (i = 0; i < 3; i++)
		ep93xx_i2s_write_reg(info, base_reg + (i * 4), 0);

	if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
	    (ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
		/* Disable i2s */
		ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 0);

		/* Disable clocks */
		clk_disable(info->lrclk);
		clk_disable(info->sclk);
		clk_disable(info->mclk);
	}
}

static int ep93xx_i2s_startup(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai);
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

	snd_soc_dai_set_dma_data(cpu_dai, substream,
				 &info->dma_params[substream->stream]);
	return 0;
}

static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream,
				struct snd_soc_dai *dai)
{
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai);

	ep93xx_i2s_disable(info, substream->stream);
}

static int ep93xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
				  unsigned int fmt)
{
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(cpu_dai);
	unsigned int clk_cfg, lin_ctrl;

	clk_cfg  = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXCLKCFG);
	lin_ctrl = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXLINCTRLDATA);

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		clk_cfg |= EP93XX_I2S_CLKCFG_REL;
		lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST;
		break;

	case SND_SOC_DAIFMT_LEFT_J:
		clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
		lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST;
		break;

	case SND_SOC_DAIFMT_RIGHT_J:
		clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
		lin_ctrl |= EP93XX_I2S_LINCTRLDATA_R_JUST;
		break;

	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		/* CPU is master */
		clk_cfg |= EP93XX_I2S_CLKCFG_MASTER;
		break;

	case SND_SOC_DAIFMT_CBM_CFM:
		/* Codec is master */
		clk_cfg &= ~EP93XX_I2S_CLKCFG_MASTER;
		break;

	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		/* Negative bit clock, lrclk low on left word */
		clk_cfg &= ~(EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL);
		break;

	case SND_SOC_DAIFMT_NB_IF:
		/* Negative bit clock, lrclk low on right word */
		clk_cfg &= ~EP93XX_I2S_CLKCFG_CKP;
		clk_cfg |= EP93XX_I2S_CLKCFG_REL;
		break;

	case SND_SOC_DAIFMT_IB_NF:
		/* Positive bit clock, lrclk low on left word */
		clk_cfg |= EP93XX_I2S_CLKCFG_CKP;
		clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
		break;

	case SND_SOC_DAIFMT_IB_IF:
		/* Positive bit clock, lrclk low on right word */
		clk_cfg |= EP93XX_I2S_CLKCFG_CKP | EP93XX_I2S_CLKCFG_REL;
		break;
	}

	/* Write new register values */
	ep93xx_i2s_write_reg(info, EP93XX_I2S_RXCLKCFG, clk_cfg);
	ep93xx_i2s_write_reg(info, EP93XX_I2S_TXCLKCFG, clk_cfg);
	ep93xx_i2s_write_reg(info, EP93XX_I2S_RXLINCTRLDATA, lin_ctrl);
	ep93xx_i2s_write_reg(info, EP93XX_I2S_TXLINCTRLDATA, lin_ctrl);
	return 0;
}

static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai);
	unsigned word_len, div, sdiv, lrdiv;
	int err;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		word_len = EP93XX_I2S_WRDLEN_16;
		break;

	case SNDRV_PCM_FORMAT_S24_LE:
		word_len = EP93XX_I2S_WRDLEN_24;
		break;

	case SNDRV_PCM_FORMAT_S32_LE:
		word_len = EP93XX_I2S_WRDLEN_32;
		break;

	default:
		return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		ep93xx_i2s_write_reg(info, EP93XX_I2S_TXWRDLEN, word_len);
	else
		ep93xx_i2s_write_reg(info, EP93XX_I2S_RXWRDLEN, word_len);

	/*
	 * EP93xx I2S module can be setup so SCLK / LRCLK value can be
	 * 32, 64, 128. MCLK / SCLK value can be 2 and 4.
	 * We set LRCLK equal to `rate' and minimum SCLK / LRCLK 
	 * value is 64, because our sample size is 32 bit * 2 channels.
	 * I2S standard permits us to transmit more bits than
	 * the codec uses.
	 */
	div = clk_get_rate(info->mclk) / params_rate(params);
	sdiv = 4;
	if (div > (256 + 512) / 2) {
		lrdiv = 128;
	} else {
		lrdiv = 64;
		if (div < (128 + 256) / 2)
			sdiv = 2;
	}

	err = clk_set_rate(info->sclk, clk_get_rate(info->mclk) / sdiv);
	if (err)
		return err;

	err = clk_set_rate(info->lrclk, clk_get_rate(info->sclk) / lrdiv);
	if (err)
		return err;

	ep93xx_i2s_enable(info, substream->stream);
	return 0;
}

static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
				 unsigned int freq, int dir)
{
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(cpu_dai);

	if (dir == SND_SOC_CLOCK_IN || clk_id != 0)
		return -EINVAL;

	return clk_set_rate(info->mclk, freq);
}

#ifdef CONFIG_PM
static int ep93xx_i2s_suspend(struct snd_soc_dai *dai)
{
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai);

	if (!dai->active)
		return 0;

	ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_PLAYBACK);
	ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_CAPTURE);

	return 0;
}

static int ep93xx_i2s_resume(struct snd_soc_dai *dai)
{
	struct ep93xx_i2s_info *info = snd_soc_dai_get_drvdata(dai);

	if (!dai->active)
		return 0;

	ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_PLAYBACK);
	ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_CAPTURE);

	return 0;
}
#else
#define ep93xx_i2s_suspend	NULL
#define ep93xx_i2s_resume	NULL
#endif

static const struct snd_soc_dai_ops ep93xx_i2s_dai_ops = {
	.startup	= ep93xx_i2s_startup,
	.shutdown	= ep93xx_i2s_shutdown,
	.hw_params	= ep93xx_i2s_hw_params,
	.set_sysclk	= ep93xx_i2s_set_sysclk,
	.set_fmt	= ep93xx_i2s_set_dai_fmt,
};

#define EP93XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_driver ep93xx_i2s_dai = {
	.symmetric_rates= 1,
	.suspend	= ep93xx_i2s_suspend,
	.resume		= ep93xx_i2s_resume,
	.playback	= {
		.channels_min	= 2,
		.channels_max	= 2,
		.rates		= SNDRV_PCM_RATE_8000_192000,
		.formats	= EP93XX_I2S_FORMATS,
	},
	.capture	= {
		 .channels_min	= 2,
		 .channels_max	= 2,
		 .rates		= SNDRV_PCM_RATE_8000_192000,
		 .formats	= EP93XX_I2S_FORMATS,
	},
	.ops		= &ep93xx_i2s_dai_ops,
};

static int ep93xx_i2s_probe(struct platform_device *pdev)
{
	struct ep93xx_i2s_info *info;
	struct resource *res;
	int err;

	info = kzalloc(sizeof(struct ep93xx_i2s_info), GFP_KERNEL);
	if (!info) {
		err = -ENOMEM;
		goto fail;
	}

	dev_set_drvdata(&pdev->dev, info);
	info->dma_params = ep93xx_i2s_dma_params;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		err = -ENODEV;
		goto fail_free_info;
	}

	info->mem = request_mem_region(res->start, resource_size(res),
				       pdev->name);
	if (!info->mem) {
		err = -EBUSY;
		goto fail_free_info;
	}

	info->regs = ioremap(info->mem->start, resource_size(info->mem));
	if (!info->regs) {
		err = -ENXIO;
		goto fail_release_mem;
	}

	info->mclk = clk_get(&pdev->dev, "mclk");
	if (IS_ERR(info->mclk)) {
		err = PTR_ERR(info->mclk);
		goto fail_unmap_mem;
	}

	info->sclk = clk_get(&pdev->dev, "sclk");
	if (IS_ERR(info->sclk)) {
		err = PTR_ERR(info->sclk);
		goto fail_put_mclk;
	}

	info->lrclk = clk_get(&pdev->dev, "lrclk");
	if (IS_ERR(info->lrclk)) {
		err = PTR_ERR(info->lrclk);
		goto fail_put_sclk;
	}

	err = snd_soc_register_dai(&pdev->dev, &ep93xx_i2s_dai);
	if (err)
		goto fail_put_lrclk;

	return 0;

fail_put_lrclk:
	clk_put(info->lrclk);
fail_put_sclk:
	clk_put(info->sclk);
fail_put_mclk:
	clk_put(info->mclk);
fail_unmap_mem:
	iounmap(info->regs);
fail_release_mem:
	release_mem_region(info->mem->start, resource_size(info->mem));
fail_free_info:
	kfree(info);
fail:
	return err;
}

static int __devexit ep93xx_i2s_remove(struct platform_device *pdev)
{
	struct ep93xx_i2s_info *info = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_dai(&pdev->dev);
	clk_put(info->lrclk);
	clk_put(info->sclk);
	clk_put(info->mclk);
	iounmap(info->regs);
	release_mem_region(info->mem->start, resource_size(info->mem));
	kfree(info);
	return 0;
}

static struct platform_driver ep93xx_i2s_driver = {
	.probe	= ep93xx_i2s_probe,
	.remove	= __devexit_p(ep93xx_i2s_remove),
	.driver	= {
		.name	= "ep93xx-i2s",
		.owner	= THIS_MODULE,
	},
};

static int __init ep93xx_i2s_init(void)
{
	return platform_driver_register(&ep93xx_i2s_driver);
}

static void __exit ep93xx_i2s_exit(void)
{
	platform_driver_unregister(&ep93xx_i2s_driver);
}

module_init(ep93xx_i2s_init);
module_exit(ep93xx_i2s_exit);

MODULE_ALIAS("platform:ep93xx-i2s");
MODULE_AUTHOR("Ryan Mallon");
MODULE_DESCRIPTION("EP93XX I2S driver");
MODULE_LICENSE("GPL");