aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/au1x/psc-i2s.c
blob: 495be6e7193169fcdf22400a682915d4966c3cc9 (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
/*
 * Au12x0/Au1550 PSC ALSA ASoC audio support.
 *
 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
 *	Manuel Lauss <manuel.lauss@gmail.com>
 *
 * 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.
 *
 * Au1xxx-PSC I2S glue.
 *
 * NOTE: all of these drivers can only work with a SINGLE instance
 *	 of a PSC. Multiple independent audio devices are impossible
 *	 with ASoC v1.
 * NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_psc.h>

#include "psc.h"

/* supported I2S DAI hardware formats */
#define AU1XPSC_I2S_DAIFMT \
	(SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |	\
	 SND_SOC_DAIFMT_NB_NF)

/* supported I2S direction */
#define AU1XPSC_I2S_DIR \
	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)

#define AU1XPSC_I2S_RATES \
	SNDRV_PCM_RATE_8000_192000

#define AU1XPSC_I2S_FMTS \
	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)

#define I2SSTAT_BUSY(stype)	\
	((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
#define I2SPCR_START(stype)	\
	((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
#define I2SPCR_STOP(stype)	\
	((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
#define I2SPCR_CLRFIFO(stype)	\
	((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)


/* instance data. There can be only one, MacLeod!!!! */
static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;

static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
			       unsigned int fmt)
{
	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	unsigned long ct;
	int ret;

	ret = -EINVAL;

	ct = pscdata->cfg;

	ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);	/* left-justified */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		ct |= PSC_I2SCFG_XM;	/* enable I2S mode */
		break;
	case SND_SOC_DAIFMT_MSB:
		break;
	case SND_SOC_DAIFMT_LSB:
		ct |= PSC_I2SCFG_MLJ;	/* LSB (right-) justified */
		break;
	default:
		goto out;
	}

	ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);		/* IB-IF */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		ct |= PSC_I2SCFG_BI;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		ct |= PSC_I2SCFG_WI;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		break;
	default:
		goto out;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:	/* CODEC master */
		ct |= PSC_I2SCFG_MS;	/* PSC I2S slave mode */
		break;
	case SND_SOC_DAIFMT_CBS_CFS:	/* CODEC slave */
		ct &= ~PSC_I2SCFG_MS;	/* PSC I2S Master mode */
		break;
	default:
		goto out;
	}

	pscdata->cfg = ct;
	ret = 0;
out:
	return ret;
}

static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;

	int cfgbits;
	unsigned long stat;

	/* check if the PSC is already streaming data */
	stat = au_readl(I2S_STAT(pscdata));
	if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
		/* reject parameters not currently set up in hardware */
		cfgbits = au_readl(I2S_CFG(pscdata));
		if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
		    (params_rate(params) != pscdata->rate))
			return -EINVAL;
	} else {
		/* set sample bitdepth */
		pscdata->cfg &= ~(0x1f << 4);
		pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
		/* remember current rate for other stream */
		pscdata->rate = params_rate(params);
	}
	return 0;
}

/* Configure PSC late:  on my devel systems the codec  is I2S master and
 * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 * uses aggressive PM and  switches the codec off  when it is not in use
 * which also means the PSC unit doesn't get any clocks and is therefore
 * dead. That's why this chunk here gets called from the trigger callback
 * because I can be reasonably certain the codec is driving the clocks.
 */
static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
{
	unsigned long tmo;

	/* bring PSC out of sleep, and configure I2S unit */
	au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
	au_sync();

	tmo = 1000000;
	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
		tmo--;

	if (!tmo)
		goto psc_err;

	au_writel(0, I2S_CFG(pscdata));
	au_sync();
	au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
	au_sync();

	/* wait for I2S controller to become ready */
	tmo = 1000000;
	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
		tmo--;

	if (tmo)
		return 0;

psc_err:
	au_writel(0, I2S_CFG(pscdata));
	au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
	au_sync();
	return -ETIMEDOUT;
}

static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
{
	unsigned long tmo, stat;
	int ret;

	ret = 0;

	/* if both TX and RX are idle, configure the PSC  */
	stat = au_readl(I2S_STAT(pscdata));
	if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
		ret = au1xpsc_i2s_configure(pscdata);
		if (ret)
			goto out;
	}

	au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
	au_sync();
	au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
	au_sync();

	/* wait for start confirmation */
	tmo = 1000000;
	while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
		tmo--;

	if (!tmo) {
		au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
		au_sync();
		ret = -ETIMEDOUT;
	}
out:
	return ret;
}

static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
{
	unsigned long tmo, stat;

	au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
	au_sync();

	/* wait for stop confirmation */
	tmo = 1000000;
	while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
		tmo--;

	/* if both TX and RX are idle, disable PSC */
	stat = au_readl(I2S_STAT(pscdata));
	if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
		au_writel(0, I2S_CFG(pscdata));
		au_sync();
		au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
		au_sync();
	}
	return 0;
}

static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			       struct snd_soc_dai *dai)
{
	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	int ret, stype = SUBSTREAM_TYPE(substream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		ret = au1xpsc_i2s_start(pscdata, stype);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		ret = au1xpsc_i2s_stop(pscdata, stype);
		break;
	default:
		ret = -EINVAL;
	}
	return ret;
}

static int au1xpsc_i2s_probe(struct platform_device *pdev,
			     struct snd_soc_dai *dai)
{
	return 	au1xpsc_i2s_workdata ? 0 : -ENODEV;
}

static void au1xpsc_i2s_remove(struct platform_device *pdev,
			       struct snd_soc_dai *dai)
{
}

static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
	.trigger	= au1xpsc_i2s_trigger,
	.hw_params	= au1xpsc_i2s_hw_params,
	.set_fmt	= au1xpsc_i2s_set_fmt,
};

struct snd_soc_dai au1xpsc_i2s_dai = {
	.name			= "au1xpsc_i2s",
	.probe			= au1xpsc_i2s_probe,
	.remove			= au1xpsc_i2s_remove,
	.playback = {
		.rates		= AU1XPSC_I2S_RATES,
		.formats	= AU1XPSC_I2S_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,	/* 2 without external help */
	},
	.capture = {
		.rates		= AU1XPSC_I2S_RATES,
		.formats	= AU1XPSC_I2S_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,	/* 2 without external help */
	},
	.ops = &au1xpsc_i2s_dai_ops,
};
EXPORT_SYMBOL(au1xpsc_i2s_dai);

static int __init au1xpsc_i2s_drvprobe(struct platform_device *pdev)
{
	struct resource *r;
	unsigned long sel;
	int ret;
	struct au1xpsc_audio_data *wd;

	if (au1xpsc_i2s_workdata)
		return -EBUSY;

	wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
	if (!wd)
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		ret = -ENODEV;
		goto out0;
	}

	ret = -EBUSY;
	wd->ioarea = request_mem_region(r->start, r->end - r->start + 1,
					"au1xpsc_i2s");
	if (!wd->ioarea)
		goto out0;

	wd->mmio = ioremap(r->start, 0xffff);
	if (!wd->mmio)
		goto out1;

	/* preserve PSC clock source set up by platform (dev.platform_data
	 * is already occupied by soc layer)
	 */
	sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();
	au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
	au_writel(0, I2S_CFG(wd));
	au_sync();

	/* preconfigure: set max rx/tx fifo depths */
	wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;

	/* don't wait for I2S core to become ready now; clocks may not
	 * be running yet; depending on clock input for PSC a wait might
	 * time out.
	 */

	ret = snd_soc_register_dai(&au1xpsc_i2s_dai);
	if (ret)
		goto out1;

	/* finally add the DMA device for this PSC */
	wd->dmapd = au1xpsc_pcm_add(pdev);
	if (wd->dmapd) {
		platform_set_drvdata(pdev, wd);
		au1xpsc_i2s_workdata = wd;
		return 0;
	}

	snd_soc_unregister_dai(&au1xpsc_i2s_dai);
out1:
	release_resource(wd->ioarea);
	kfree(wd->ioarea);
out0:
	kfree(wd);
	return ret;
}

static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev)
{
	struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);

	if (wd->dmapd)
		au1xpsc_pcm_destroy(wd->dmapd);

	snd_soc_unregister_dai(&au1xpsc_i2s_dai);

	au_writel(0, I2S_CFG(wd));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();

	iounmap(wd->mmio);
	release_resource(wd->ioarea);
	kfree(wd->ioarea);
	kfree(wd);

	au1xpsc_i2s_workdata = NULL;	/* MDEV */

	return 0;
}

#ifdef CONFIG_PM
static int au1xpsc_i2s_drvsuspend(struct device *dev)
{
	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);

	/* save interesting register and disable PSC */
	wd->pm[0] = au_readl(PSC_SEL(wd));

	au_writel(0, I2S_CFG(wd));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();

	return 0;
}

static int au1xpsc_i2s_drvresume(struct device *dev)
{
	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);

	/* select I2S mode and PSC clock */
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();
	au_writel(0, PSC_SEL(wd));
	au_sync();
	au_writel(wd->pm[0], PSC_SEL(wd));
	au_sync();

	return 0;
}

static struct dev_pm_ops au1xpsci2s_pmops = {
	.suspend	= au1xpsc_i2s_drvsuspend,
	.resume		= au1xpsc_i2s_drvresume,
};

#define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops

#else

#define AU1XPSCI2S_PMOPS NULL

#endif

static struct platform_driver au1xpsc_i2s_driver = {
	.driver		= {
		.name	= "au1xpsc_i2s",
		.owner	= THIS_MODULE,
		.pm	= AU1XPSCI2S_PMOPS,
	},
	.probe		= au1xpsc_i2s_drvprobe,
	.remove		= __devexit_p(au1xpsc_i2s_drvremove),
};

static int __init au1xpsc_i2s_load(void)
{
	au1xpsc_i2s_workdata = NULL;
	return platform_driver_register(&au1xpsc_i2s_driver);
}

static void __exit au1xpsc_i2s_unload(void)
{
	platform_driver_unregister(&au1xpsc_i2s_driver);
}

module_init(au1xpsc_i2s_load);
module_exit(au1xpsc_i2s_unload);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
MODULE_AUTHOR("Manuel Lauss");