summaryrefslogtreecommitdiffstats
path: root/sound/soc/nuc900/nuc900-ac97.c
blob: b6615affe5718b379df657f401cf34eeddc08dd1 (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
/*
 * Copyright (c) 2009-2010 Nuvoton technology corporation.
 *
 * Wan ZongShun <mcuos.com@gmail.com>
 *
 * 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;version 2 of the License.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/suspend.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <linux/clk.h>

#include <mach/mfp.h>

#include "nuc900-audio.h"

static DEFINE_MUTEX(ac97_mutex);
struct nuc900_audio *nuc900_ac97_data;
EXPORT_SYMBOL_GPL(nuc900_ac97_data);

static int nuc900_checkready(void)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

	if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
		return -EPERM;

	return 0;
}

/* AC97 controller reads codec register */
static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
					unsigned short reg)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long timeout = 0x10000, val;

	mutex_lock(&ac97_mutex);

	val = nuc900_checkready();
	if (val) {
		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
		goto out;
	}

	/* set the R_WB bit and write register index */
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);

	/* set the valid frame bit and valid slots */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	val |= (VALID_FRAME | SLOT1_VALID);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);

	udelay(100);

	/* polling the AC_R_FINISH */
	while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
								&& timeout--)
		mdelay(1);

	if (!timeout) {
		dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
		val = -EPERM;
		goto out;
	}

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
	val &= ~SLOT1_VALID;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);

	if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
		dev_err(nuc900_audio->dev,
				"R_INDEX of REG_ACTL_ACIS1 not match!\n");
	}

	udelay(100);
	val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);

out:
	mutex_unlock(&ac97_mutex);
	return val;
}

/* AC97 controller writes to codec register */
static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
				unsigned short val)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long tmp, timeout = 0x10000;

	mutex_lock(&ac97_mutex);

	tmp = nuc900_checkready();
	if (tmp)
		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");

	/* clear the R_WB bit and write register index */
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);

	/* write register value */
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);

	/* set the valid frame bit and valid slots */
	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

	udelay(100);

	/* polling the AC_W_FINISH */
	while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
								&& timeout--)
		mdelay(1);

	if (!timeout)
		dev_err(nuc900_audio->dev, "AC97 write register time out !\n");

	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	tmp &= ~(SLOT1_VALID | SLOT2_VALID);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

	mutex_unlock(&ac97_mutex);

}

static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long val;

	mutex_lock(&ac97_mutex);

	/* warm reset AC 97 */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	val |= AC_W_RES;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

	udelay(100);

	val = nuc900_checkready();
	if (val)
		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");

	mutex_unlock(&ac97_mutex);
}

static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long val;

	mutex_lock(&ac97_mutex);

	/* reset Audio Controller */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val |= ACTL_RESET_BIT;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val &= (~ACTL_RESET_BIT);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	/* reset AC-link interface */

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val |= AC_RESET;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val &= ~AC_RESET;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	/* cold reset AC 97 */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	val |= AC_C_RES;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	val &= (~AC_C_RES);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

	udelay(100);

	mutex_unlock(&ac97_mutex);

}

/* AC97 controller operations */
static struct snd_ac97_bus_ops nuc900_ac97_ops = {
	.read		= nuc900_ac97_read,
	.write		= nuc900_ac97_write,
	.reset		= nuc900_ac97_cold_reset,
	.warm_reset	= nuc900_ac97_warm_reset,
};

static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
				int cmd, struct snd_soc_dai *dai)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	int ret;
	unsigned long val, tmp;

	ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
			tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
			tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
			val |= AC_PLAY;
		} else {
			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
			tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);

			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
			val |= AC_RECORD;
		}

		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
			tmp &= ~(SLOT3_VALID | SLOT4_VALID);
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
			val &= ~AC_PLAY;
		} else {
			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
			val &= ~AC_RECORD;
		}

		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int nuc900_ac97_probe(struct snd_soc_dai *dai)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long val;

	mutex_lock(&ac97_mutex);

	/* enable unit clock */
	clk_enable(nuc900_audio->clk);

	/* enable audio controller and AC-link interface */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
	val |= (IIS_AC_PIN_SEL | ACLINK_EN);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);

	mutex_unlock(&ac97_mutex);

	return 0;
}

static int nuc900_ac97_remove(struct snd_soc_dai *dai)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

	clk_disable(nuc900_audio->clk);
	return 0;
}

static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
	.trigger	= nuc900_ac97_trigger,
};

static struct snd_soc_dai_driver nuc900_ac97_dai = {
	.probe			= nuc900_ac97_probe,
	.remove			= nuc900_ac97_remove,
	.bus_control		= true,
	.playback = {
		.rates		= SNDRV_PCM_RATE_8000_48000,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
		.channels_min	= 1,
		.channels_max	= 2,
	},
	.capture = {
		.rates		= SNDRV_PCM_RATE_8000_48000,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
		.channels_min	= 1,
		.channels_max	= 2,
	},
	.ops = &nuc900_ac97_dai_ops,
};

static const struct snd_soc_component_driver nuc900_ac97_component = {
	.name		= "nuc900-ac97",
};

static int nuc900_ac97_drvprobe(struct platform_device *pdev)
{
	struct nuc900_audio *nuc900_audio;
	int ret;

	if (nuc900_ac97_data)
		return -EBUSY;

	nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
				    GFP_KERNEL);
	if (!nuc900_audio)
		return -ENOMEM;

	spin_lock_init(&nuc900_audio->lock);

	nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
						   nuc900_audio->res);
	if (IS_ERR(nuc900_audio->mmio))
		return PTR_ERR(nuc900_audio->mmio);

	nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(nuc900_audio->clk)) {
		ret = PTR_ERR(nuc900_audio->clk);
		goto out;
	}

	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
	if (!nuc900_audio->irq_num) {
		ret = -EBUSY;
		goto out;
	}

	nuc900_ac97_data = nuc900_audio;

	ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
	if (ret)
		goto out;

	ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
					 &nuc900_ac97_dai, 1);
	if (ret)
		goto out;

	/* enbale ac97 multifunction pin */
	mfp_set_groupg(nuc900_audio->dev, NULL);

	return 0;

out:
	snd_soc_set_ac97_ops(NULL);
	return ret;
}

static int nuc900_ac97_drvremove(struct platform_device *pdev)
{
	snd_soc_unregister_component(&pdev->dev);

	nuc900_ac97_data = NULL;
	snd_soc_set_ac97_ops(NULL);

	return 0;
}

static struct platform_driver nuc900_ac97_driver = {
	.driver	= {
		.name	= "nuc900-ac97",
	},
	.probe		= nuc900_ac97_drvprobe,
	.remove		= nuc900_ac97_drvremove,
};

module_platform_driver(nuc900_ac97_driver);

MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-ac97");
OpenPOWER on IntegriCloud