aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/au1x/psc-ac97.c
blob: d0db66f24a00cc0ce68f622161bef3b4155a7c82 (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
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
511
512
513
514
515
516
/*
 * Au12x0/Au1550 PSC ALSA ASoC audio support.
 *
 * (c) 2007-2009 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 AC97 glue.
 *
 */

#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 <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_psc.h>

#include "psc.h"

/* how often to retry failed codec register reads/writes */
#define AC97_RW_RETRIES	5

#define AC97_DIR	\
	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)

#define AC97_RATES	\
	SNDRV_PCM_RATE_8000_48000

#define AC97_FMTS	\
	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)

#define AC97PCR_START(stype)	\
	((stype) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
#define AC97PCR_STOP(stype)	\
	((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
#define AC97PCR_CLRFIFO(stype)	\
	((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)

#define AC97STAT_BUSY(stype)	\
	((stype) == PCM_TX ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)

/* instance data. There can be only one, MacLeod!!!! */
static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;

#if 0

/* this could theoretically work, but ac97->bus->card->private_data can be NULL
 * when snd_ac97_mixer() is called; I don't know if the rest further down the
 * chain are always valid either.
 */
static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
{
	struct snd_soc_card *c = x->bus->card->private_data;
	return snd_soc_dai_get_drvdata(c->rtd->cpu_dai);
}

#else

#define ac97_to_pscdata(x)	au1xpsc_ac97_workdata

#endif

/* AC97 controller reads codec register */
static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
					unsigned short reg)
{
	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
	unsigned short retry, tmo;
	unsigned long data;

	au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
	au_sync();

	retry = AC97_RW_RETRIES;
	do {
		mutex_lock(&pscdata->lock);

		au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
			  AC97_CDC(pscdata));
		au_sync();

		tmo = 20;
		do {
			udelay(21);
			if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
				break;
		} while (--tmo);

		data = au_readl(AC97_CDC(pscdata));

		au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
		au_sync();

		mutex_unlock(&pscdata->lock);

		if (reg != ((data >> 16) & 0x7f))
			tmo = 1;	/* wrong register, try again */

	} while (--retry && !tmo);

	return retry ? data & 0xffff : 0xffff;
}

/* AC97 controller writes to codec register */
static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
				unsigned short val)
{
	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
	unsigned int tmo, retry;

	au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
	au_sync();

	retry = AC97_RW_RETRIES;
	do {
		mutex_lock(&pscdata->lock);

		au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
			  AC97_CDC(pscdata));
		au_sync();

		tmo = 20;
		do {
			udelay(21);
			if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
				break;
		} while (--tmo);

		au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
		au_sync();

		mutex_unlock(&pscdata->lock);
	} while (--retry && !tmo);
}

/* AC97 controller asserts a warm reset */
static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
{
	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);

	au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
	au_sync();
	msleep(10);
	au_writel(0, AC97_RST(pscdata));
	au_sync();
}

static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
{
	struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
	int i;

	/* disable PSC during cold reset */
	au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
	au_sync();

	/* issue cold reset */
	au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
	au_sync();
	msleep(500);
	au_writel(0, AC97_RST(pscdata));
	au_sync();

	/* enable PSC */
	au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
	au_sync();

	/* wait for PSC to indicate it's ready */
	i = 1000;
	while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
		msleep(1);

	if (i == 0) {
		printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
		return;
	}

	/* enable the ac97 function */
	au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
	au_sync();

	/* wait for AC97 core to become ready */
	i = 1000;
	while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
		msleep(1);
	if (i == 0)
		printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
}

/* AC97 controller operations */
struct snd_ac97_bus_ops soc_ac97_ops = {
	.read		= au1xpsc_ac97_read,
	.write		= au1xpsc_ac97_write,
	.reset		= au1xpsc_ac97_cold_reset,
	.warm_reset	= au1xpsc_ac97_warm_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);

static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params,
				  struct snd_soc_dai *dai)
{
	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
	unsigned long r, ro, stat;
	int chans, t, stype = SUBSTREAM_TYPE(substream);

	chans = params_channels(params);

	r = ro = au_readl(AC97_CFG(pscdata));
	stat = au_readl(AC97_STAT(pscdata));

	/* already active? */
	if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
		/* reject parameters not currently set up */
		if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
		    (pscdata->rate != params_rate(params)))
			return -EINVAL;
	} else {

		/* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
		r &= ~PSC_AC97CFG_LEN_MASK;
		r |= PSC_AC97CFG_SET_LEN(params->msbits);

		/* channels: enable slots for front L/R channel */
		if (stype == PCM_TX) {
			r &= ~PSC_AC97CFG_TXSLOT_MASK;
			r |= PSC_AC97CFG_TXSLOT_ENA(3);
			r |= PSC_AC97CFG_TXSLOT_ENA(4);
		} else {
			r &= ~PSC_AC97CFG_RXSLOT_MASK;
			r |= PSC_AC97CFG_RXSLOT_ENA(3);
			r |= PSC_AC97CFG_RXSLOT_ENA(4);
		}

		/* do we need to poke the hardware? */
		if (!(r ^ ro))
			goto out;

		/* ac97 engine is about to be disabled */
		mutex_lock(&pscdata->lock);

		/* disable AC97 device controller first... */
		au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
		au_sync();

		/* ...wait for it... */
		t = 100;
		while ((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
			msleep(1);

		if (!t)
			printk(KERN_ERR "PSC-AC97: can't disable!\n");

		/* ...write config... */
		au_writel(r, AC97_CFG(pscdata));
		au_sync();

		/* ...enable the AC97 controller again... */
		au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
		au_sync();

		/* ...and wait for ready bit */
		t = 100;
		while ((!(au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
			msleep(1);

		if (!t)
			printk(KERN_ERR "PSC-AC97: can't enable!\n");

		mutex_unlock(&pscdata->lock);

		pscdata->cfg = r;
		pscdata->rate = params_rate(params);
	}

out:
	return 0;
}

static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
				int cmd, struct snd_soc_dai *dai)
{
	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
	int ret, stype = SUBSTREAM_TYPE(substream);

	ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
		au_sync();
		au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
		au_sync();
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
		au_sync();

		while (au_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
			asm volatile ("nop");

		au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
		au_sync();

		break;
	default:
		ret = -EINVAL;
	}
	return ret;
}

static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
{
	return au1xpsc_ac97_workdata ? 0 : -ENODEV;
}

static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
	.trigger	= au1xpsc_ac97_trigger,
	.hw_params	= au1xpsc_ac97_hw_params,
};

static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
	.ac97_control		= 1,
	.probe			= au1xpsc_ac97_probe,
	.playback = {
		.rates		= AC97_RATES,
		.formats	= AC97_FMTS,
		.channels_min	= 2,
		.channels_max	= 2,
	},
	.capture = {
		.rates		= AC97_RATES,
		.formats	= AC97_FMTS,
		.channels_min	= 2,
		.channels_max	= 2,
	},
	.ops = &au1xpsc_ac97_dai_ops,
};

static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
{
	int ret;
	struct resource *r;
	unsigned long sel;
	struct au1xpsc_audio_data *wd;

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

	mutex_init(&wd->lock);

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

	ret = -EBUSY;
	if (!request_mem_region(r->start, resource_size(r), pdev->name))
		goto out0;

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

	/* configuration: max dma trigger threshold, enable ac97 */
	wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
		  PSC_AC97CFG_DE_ENABLE;

	/* preserve PSC clock source set up by platform	 */
	sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();
	au_writel(0, PSC_SEL(wd));
	au_sync();
	au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
	au_sync();

	/* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
	memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
	       sizeof(struct snd_soc_dai_driver));
	wd->dai_drv.name = dev_name(&pdev->dev);

	platform_set_drvdata(pdev, wd);

	ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
	if (ret)
		goto out1;

	wd->dmapd = au1xpsc_pcm_add(pdev);
	if (wd->dmapd) {
		au1xpsc_ac97_workdata = wd;
		return 0;
	}

	snd_soc_unregister_dai(&pdev->dev);
out1:
	release_mem_region(r->start, resource_size(r));
out0:
	kfree(wd);
	return ret;
}

static int __devexit au1xpsc_ac97_drvremove(struct platform_device *pdev)
{
	struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
	struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

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

	snd_soc_unregister_dai(&pdev->dev);

	/* disable PSC completely */
	au_writel(0, AC97_CFG(wd));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();

	iounmap(wd->mmio);
	release_mem_region(r->start, resource_size(r));
	kfree(wd);

	au1xpsc_ac97_workdata = NULL;	/* MDEV */

	return 0;
}

#ifdef CONFIG_PM
static int au1xpsc_ac97_drvsuspend(struct device *dev)
{
	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);

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

	au_writel(0, AC97_CFG(wd));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();

	return 0;
}

static int au1xpsc_ac97_drvresume(struct device *dev)
{
	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);

	/* restore PSC clock config */
	au_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
	au_sync();

	/* after this point the ac97 core will cold-reset the codec.
	 * During cold-reset the PSC is reinitialized and the last
	 * configuration set up in hw_params() is restored.
	 */
	return 0;
}

static struct dev_pm_ops au1xpscac97_pmops = {
	.suspend	= au1xpsc_ac97_drvsuspend,
	.resume		= au1xpsc_ac97_drvresume,
};

#define AU1XPSCAC97_PMOPS &au1xpscac97_pmops

#else

#define AU1XPSCAC97_PMOPS NULL

#endif

static struct platform_driver au1xpsc_ac97_driver = {
	.driver	= {
		.name	= "au1xpsc_ac97",
		.owner	= THIS_MODULE,
		.pm	= AU1XPSCAC97_PMOPS,
	},
	.probe		= au1xpsc_ac97_drvprobe,
	.remove		= __devexit_p(au1xpsc_ac97_drvremove),
};

static int __init au1xpsc_ac97_load(void)
{
	au1xpsc_ac97_workdata = NULL;
	return platform_driver_register(&au1xpsc_ac97_driver);
}

static void __exit au1xpsc_ac97_unload(void)
{
	platform_driver_unregister(&au1xpsc_ac97_driver);
}

module_init(au1xpsc_ac97_load);
module_exit(au1xpsc_ac97_unload);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
MODULE_AUTHOR("Manuel Lauss");