summaryrefslogtreecommitdiffstats
path: root/sound/soc/dwc/designware_i2s.c
blob: e961388e6e9c07ce3b5b7249d464538e5d418ea0 (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
/*
 * ALSA SoC Synopsys I2S Audio Layer
 *
 * sound/soc/dwc/designware_i2s.c
 *
 * Copyright (C) 2010 ST Microelectronics
 * Rajeev Kumar <rajeevkumar.linux@gmail.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <sound/designware_i2s.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

/* common register for all channel */
#define IER		0x000
#define IRER		0x004
#define ITER		0x008
#define CER		0x00C
#define CCR		0x010
#define RXFFR		0x014
#define TXFFR		0x018

/* I2STxRxRegisters for all channels */
#define LRBR_LTHR(x)	(0x40 * x + 0x020)
#define RRBR_RTHR(x)	(0x40 * x + 0x024)
#define RER(x)		(0x40 * x + 0x028)
#define TER(x)		(0x40 * x + 0x02C)
#define RCR(x)		(0x40 * x + 0x030)
#define TCR(x)		(0x40 * x + 0x034)
#define ISR(x)		(0x40 * x + 0x038)
#define IMR(x)		(0x40 * x + 0x03C)
#define ROR(x)		(0x40 * x + 0x040)
#define TOR(x)		(0x40 * x + 0x044)
#define RFCR(x)		(0x40 * x + 0x048)
#define TFCR(x)		(0x40 * x + 0x04C)
#define RFF(x)		(0x40 * x + 0x050)
#define TFF(x)		(0x40 * x + 0x054)

/* I2SCOMPRegisters */
#define I2S_COMP_PARAM_2	0x01F0
#define I2S_COMP_PARAM_1	0x01F4
#define I2S_COMP_VERSION	0x01F8
#define I2S_COMP_TYPE		0x01FC

#define MAX_CHANNEL_NUM		8
#define MIN_CHANNEL_NUM		2

struct dw_i2s_dev {
	void __iomem *i2s_base;
	struct clk *clk;
	int active;
	unsigned int capability;
	struct device *dev;

	/* data related to DMA transfers b/w i2s and DMAC */
	struct i2s_dma_data play_dma_data;
	struct i2s_dma_data capture_dma_data;
	struct i2s_clk_config_data config;
	int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
};

static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
{
	writel(val, io_base + reg);
}

static inline u32 i2s_read_reg(void __iomem *io_base, int reg)
{
	return readl(io_base + reg);
}

static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
{
	u32 i = 0;

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		for (i = 0; i < 4; i++)
			i2s_write_reg(dev->i2s_base, TER(i), 0);
	} else {
		for (i = 0; i < 4; i++)
			i2s_write_reg(dev->i2s_base, RER(i), 0);
	}
}

static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
{
	u32 i = 0;

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		for (i = 0; i < 4; i++)
			i2s_write_reg(dev->i2s_base, TOR(i), 0);
	} else {
		for (i = 0; i < 4; i++)
			i2s_write_reg(dev->i2s_base, ROR(i), 0);
	}
}

static void i2s_start(struct dw_i2s_dev *dev,
		      struct snd_pcm_substream *substream)
{

	i2s_write_reg(dev->i2s_base, IER, 1);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		i2s_write_reg(dev->i2s_base, ITER, 1);
	else
		i2s_write_reg(dev->i2s_base, IRER, 1);

	i2s_write_reg(dev->i2s_base, CER, 1);
}

static void i2s_stop(struct dw_i2s_dev *dev,
		struct snd_pcm_substream *substream)
{
	u32 i = 0, irq;

	i2s_clear_irqs(dev, substream->stream);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		i2s_write_reg(dev->i2s_base, ITER, 0);

		for (i = 0; i < 4; i++) {
			irq = i2s_read_reg(dev->i2s_base, IMR(i));
			i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x30);
		}
	} else {
		i2s_write_reg(dev->i2s_base, IRER, 0);

		for (i = 0; i < 4; i++) {
			irq = i2s_read_reg(dev->i2s_base, IMR(i));
			i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x03);
		}
	}

	if (!dev->active) {
		i2s_write_reg(dev->i2s_base, CER, 0);
		i2s_write_reg(dev->i2s_base, IER, 0);
	}
}

static int dw_i2s_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *cpu_dai)
{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
	struct i2s_dma_data *dma_data = NULL;

	if (!(dev->capability & DWC_I2S_RECORD) &&
			(substream->stream == SNDRV_PCM_STREAM_CAPTURE))
		return -EINVAL;

	if (!(dev->capability & DWC_I2S_PLAY) &&
			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
		return -EINVAL;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dma_data = &dev->play_dma_data;
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		dma_data = &dev->capture_dma_data;

	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);

	return 0;
}

static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
	struct i2s_clk_config_data *config = &dev->config;
	u32 ccr, xfer_resolution, ch_reg, irq;
	int ret;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		config->data_width = 16;
		ccr = 0x00;
		xfer_resolution = 0x02;
		break;

	case SNDRV_PCM_FORMAT_S24_LE:
		config->data_width = 24;
		ccr = 0x08;
		xfer_resolution = 0x04;
		break;

	case SNDRV_PCM_FORMAT_S32_LE:
		config->data_width = 32;
		ccr = 0x10;
		xfer_resolution = 0x05;
		break;

	default:
		dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
		return -EINVAL;
	}

	config->chan_nr = params_channels(params);

	switch (config->chan_nr) {
	case EIGHT_CHANNEL_SUPPORT:
		ch_reg = 3;
		break;
	case SIX_CHANNEL_SUPPORT:
		ch_reg = 2;
		break;
	case FOUR_CHANNEL_SUPPORT:
		ch_reg = 1;
		break;
	case TWO_CHANNEL_SUPPORT:
		ch_reg = 0;
		break;
	default:
		dev_err(dev->dev, "channel not supported\n");
		return -EINVAL;
	}

	i2s_disable_channels(dev, substream->stream);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
		i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
		i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
	} else {
		i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
		i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
		irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
		i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
		i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
	}

	i2s_write_reg(dev->i2s_base, CCR, ccr);

	config->sample_rate = params_rate(params);

	if (!dev->i2s_clk_cfg)
		return -EINVAL;

	ret = dev->i2s_clk_cfg(config);
	if (ret < 0) {
		dev_err(dev->dev, "runtime audio clk config fail\n");
		return ret;
	}

	return 0;
}

static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	snd_soc_dai_set_dma_data(dai, substream, NULL);
}

static int dw_i2s_trigger(struct snd_pcm_substream *substream,
		int cmd, struct snd_soc_dai *dai)
{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		dev->active++;
		i2s_start(dev, substream);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		dev->active--;
		i2s_stop(dev, substream);
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static struct snd_soc_dai_ops dw_i2s_dai_ops = {
	.startup	= dw_i2s_startup,
	.shutdown	= dw_i2s_shutdown,
	.hw_params	= dw_i2s_hw_params,
	.trigger	= dw_i2s_trigger,
};

static const struct snd_soc_component_driver dw_i2s_component = {
	.name		= "dw-i2s",
};

#ifdef CONFIG_PM

static int dw_i2s_suspend(struct snd_soc_dai *dai)
{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

	clk_disable(dev->clk);
	return 0;
}

static int dw_i2s_resume(struct snd_soc_dai *dai)
{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

	clk_enable(dev->clk);
	return 0;
}

#else
#define dw_i2s_suspend	NULL
#define dw_i2s_resume	NULL
#endif

static int dw_i2s_probe(struct platform_device *pdev)
{
	const struct i2s_platform_data *pdata = pdev->dev.platform_data;
	struct dw_i2s_dev *dev;
	struct resource *res;
	int ret;
	unsigned int cap;
	struct snd_soc_dai_driver *dw_i2s_dai;

	if (!pdata) {
		dev_err(&pdev->dev, "Invalid platform data\n");
		return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "no i2s resource defined\n");
		return -ENODEV;
	}

	if (!devm_request_mem_region(&pdev->dev, res->start,
				resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "i2s region already claimed\n");
		return -EBUSY;
	}

	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		dev_warn(&pdev->dev, "kzalloc fail\n");
		return -ENOMEM;
	}

	dev->i2s_base = devm_ioremap(&pdev->dev, res->start,
			resource_size(res));
	if (!dev->i2s_base) {
		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
		return -ENOMEM;
	}

	cap = pdata->cap;
	dev->capability = cap;
	dev->i2s_clk_cfg = pdata->i2s_clk_cfg;

	/* Set DMA slaves info */

	dev->play_dma_data.data = pdata->play_dma_data;
	dev->capture_dma_data.data = pdata->capture_dma_data;
	dev->play_dma_data.addr = res->start + I2S_TXDMA;
	dev->capture_dma_data.addr = res->start + I2S_RXDMA;
	dev->play_dma_data.max_burst = 16;
	dev->capture_dma_data.max_burst = 16;
	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	dev->play_dma_data.filter = pdata->filter;
	dev->capture_dma_data.filter = pdata->filter;

	dev->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(dev->clk))
		return  PTR_ERR(dev->clk);

	ret = clk_enable(dev->clk);
	if (ret < 0)
		goto err_clk_put;

	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
	if (!dw_i2s_dai) {
		dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
		ret = -ENOMEM;
		goto err_clk_disable;
	}

	if (cap & DWC_I2S_PLAY) {
		dev_dbg(&pdev->dev, " designware: play supported\n");
		dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
		dw_i2s_dai->playback.channels_max = pdata->channel;
		dw_i2s_dai->playback.formats = pdata->snd_fmts;
		dw_i2s_dai->playback.rates = pdata->snd_rates;
	}

	if (cap & DWC_I2S_RECORD) {
		dev_dbg(&pdev->dev, "designware: record supported\n");
		dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
		dw_i2s_dai->capture.channels_max = pdata->channel;
		dw_i2s_dai->capture.formats = pdata->snd_fmts;
		dw_i2s_dai->capture.rates = pdata->snd_rates;
	}

	dw_i2s_dai->ops = &dw_i2s_dai_ops;
	dw_i2s_dai->suspend = dw_i2s_suspend;
	dw_i2s_dai->resume = dw_i2s_resume;

	dev->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, dev);
	ret = snd_soc_register_component(&pdev->dev, &dw_i2s_component,
					 dw_i2s_dai, 1);
	if (ret != 0) {
		dev_err(&pdev->dev, "not able to register dai\n");
		goto err_clk_disable;
	}

	return 0;

err_clk_disable:
	clk_disable(dev->clk);
err_clk_put:
	clk_put(dev->clk);
	return ret;
}

static int dw_i2s_remove(struct platform_device *pdev)
{
	struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_component(&pdev->dev);

	clk_put(dev->clk);

	return 0;
}

static struct platform_driver dw_i2s_driver = {
	.probe		= dw_i2s_probe,
	.remove		= dw_i2s_remove,
	.driver		= {
		.name	= "designware-i2s",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver(dw_i2s_driver);

MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:designware_i2s");