summaryrefslogtreecommitdiffstats
path: root/sound/soc/samsung/ac97.c
blob: 2dd623fa3882b8fe17ceab2c6a86f45f54059f9d (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
/* sound/soc/samsung/ac97.c
 *
 * ALSA SoC Audio Layer - S3C AC97 Controller driver
 * 	Evolved from s3c2443-ac97.c
 *
 * Copyright (c) 2010 Samsung Electronics Co. Ltd
 *	Author: Jaswinder Singh <jassisinghbrar@gmail.com>
 * 	Credits: Graeme Gregory, Sean Choi
 *
 * 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/io.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/module.h>

#include <sound/soc.h>

#include <mach/dma.h>
#include "regs-ac97.h"
#include <linux/platform_data/asoc-s3c.h>

#include "dma.h"

#define AC_CMD_ADDR(x) (x << 16)
#define AC_CMD_DATA(x) (x & 0xffff)

#define S3C_AC97_DAI_PCM 0
#define S3C_AC97_DAI_MIC 1

struct s3c_ac97_info {
	struct clk         *ac97_clk;
	void __iomem	   *regs;
	struct mutex       lock;
	struct completion  done;
};
static struct s3c_ac97_info s3c_ac97;

static struct s3c2410_dma_client s3c_dma_client_out = {
	.name = "AC97 PCMOut"
};

static struct s3c2410_dma_client s3c_dma_client_in = {
	.name = "AC97 PCMIn"
};

static struct s3c2410_dma_client s3c_dma_client_micin = {
	.name = "AC97 MicIn"
};

static struct s3c_dma_params s3c_ac97_pcm_out = {
	.client		= &s3c_dma_client_out,
	.dma_size	= 4,
};

static struct s3c_dma_params s3c_ac97_pcm_in = {
	.client		= &s3c_dma_client_in,
	.dma_size	= 4,
};

static struct s3c_dma_params s3c_ac97_mic_in = {
	.client		= &s3c_dma_client_micin,
	.dma_size	= 4,
};

static void s3c_ac97_activate(struct snd_ac97 *ac97)
{
	u32 ac_glbctrl, stat;

	stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
	if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
		return; /* Return if already active */

	INIT_COMPLETION(s3c_ac97.done);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
		pr_err("AC97: Unable to activate!");
}

static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
{
	u32 ac_glbctrl, ac_codec_cmd;
	u32 stat, addr, data;

	mutex_lock(&s3c_ac97.lock);

	s3c_ac97_activate(ac97);

	INIT_COMPLETION(s3c_ac97.done);

	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

	udelay(50);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
		pr_err("AC97: Unable to read!");

	stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
	addr = (stat >> 16) & 0x7f;
	data = (stat & 0xffff);

	if (addr != reg)
		pr_err("ac97: req addr = %02x, rep addr = %02x\n",
			reg, addr);

	mutex_unlock(&s3c_ac97.lock);

	return (unsigned short)data;
}

static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
{
	u32 ac_glbctrl, ac_codec_cmd;

	mutex_lock(&s3c_ac97.lock);

	s3c_ac97_activate(ac97);

	INIT_COMPLETION(s3c_ac97.done);

	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

	udelay(50);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
		pr_err("AC97: Unable to write!");

	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

	mutex_unlock(&s3c_ac97.lock);
}

static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
{
	pr_debug("AC97: Cold reset\n");
	writel(S3C_AC97_GLBCTRL_COLDRESET,
			s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);
}

static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
{
	u32 stat;

	stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
	if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
		return; /* Return if already active */

	pr_debug("AC97: Warm reset\n");

	writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	s3c_ac97_activate(ac97);
}

static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
{
	u32 ac_glbctrl, ac_glbstat;

	ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);

	if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {

		ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
		ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
		writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

		complete(&s3c_ac97.done);
	}

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl |= (1<<30); /* Clear interrupt */
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	return IRQ_HANDLED;
}

static struct snd_ac97_bus_ops s3c_ac97_ops = {
	.read       = s3c_ac97_read,
	.write      = s3c_ac97_write,
	.warm_reset = s3c_ac97_warm_reset,
	.reset      = s3c_ac97_cold_reset,
};

static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params,
				  struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct s3c_dma_params *dma_data;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dma_data = &s3c_ac97_pcm_out;
	else
		dma_data = &s3c_ac97_pcm_in;

	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);

	return 0;
}

static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
				struct snd_soc_dai *dai)
{
	u32 ac_glbctrl;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct s3c_dma_params *dma_data =
		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
	else
		ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
		else
			ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		break;
	}

	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!dma_data->ops)
		dma_data->ops = samsung_dma_get_ops();

	dma_data->ops->started(dma_data->channel);

	return 0;
}

static int s3c_ac97_hw_mic_params(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params *params,
				      struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return -ENODEV;
	else
		snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);

	return 0;
}

static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
				    int cmd, struct snd_soc_dai *dai)
{
	u32 ac_glbctrl;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct s3c_dma_params *dma_data =
		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		break;
	}

	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!dma_data->ops)
		dma_data->ops = samsung_dma_get_ops();

	dma_data->ops->started(dma_data->channel);

	return 0;
}

static const struct snd_soc_dai_ops s3c_ac97_dai_ops = {
	.hw_params	= s3c_ac97_hw_params,
	.trigger	= s3c_ac97_trigger,
};

static const struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
	.hw_params	= s3c_ac97_hw_mic_params,
	.trigger	= s3c_ac97_mic_trigger,
};

static struct snd_soc_dai_driver s3c_ac97_dai[] = {
	[S3C_AC97_DAI_PCM] = {
		.name =	"samsung-ac97",
		.ac97_control = 1,
		.playback = {
			.stream_name = "AC97 Playback",
			.channels_min = 2,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_8000_48000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,},
		.capture = {
			.stream_name = "AC97 Capture",
			.channels_min = 2,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_8000_48000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,},
		.ops = &s3c_ac97_dai_ops,
	},
	[S3C_AC97_DAI_MIC] = {
		.name = "samsung-ac97-mic",
		.ac97_control = 1,
		.capture = {
			.stream_name = "AC97 Mic Capture",
			.channels_min = 1,
			.channels_max = 1,
			.rates = SNDRV_PCM_RATE_8000_48000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,},
		.ops = &s3c_ac97_mic_dai_ops,
	},
};

static const struct snd_soc_component_driver s3c_ac97_component = {
	.name		= "s3c-ac97",
};

static int s3c_ac97_probe(struct platform_device *pdev)
{
	struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
	struct s3c_audio_pdata *ac97_pdata;
	int ret;

	ac97_pdata = pdev->dev.platform_data;
	if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
		dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
		return -EINVAL;
	}

	/* Check for availability of necessary resource */
	dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dmatx_res) {
		dev_err(&pdev->dev, "Unable to get AC97-TX dma resource\n");
		return -ENXIO;
	}

	dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!dmarx_res) {
		dev_err(&pdev->dev, "Unable to get AC97-RX dma resource\n");
		return -ENXIO;
	}

	dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
	if (!dmamic_res) {
		dev_err(&pdev->dev, "Unable to get AC97-MIC dma resource\n");
		return -ENXIO;
	}

	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem_res) {
		dev_err(&pdev->dev, "Unable to get register resource\n");
		return -ENXIO;
	}

	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq_res) {
		dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
		return -ENXIO;
	}

	s3c_ac97.regs = devm_ioremap_resource(&pdev->dev, mem_res);
	if (IS_ERR(s3c_ac97.regs))
		return PTR_ERR(s3c_ac97.regs);

	s3c_ac97_pcm_out.channel = dmatx_res->start;
	s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
	s3c_ac97_pcm_in.channel = dmarx_res->start;
	s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
	s3c_ac97_mic_in.channel = dmamic_res->start;
	s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;

	init_completion(&s3c_ac97.done);
	mutex_init(&s3c_ac97.lock);

	s3c_ac97.ac97_clk = devm_clk_get(&pdev->dev, "ac97");
	if (IS_ERR(s3c_ac97.ac97_clk)) {
		dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
		ret = -ENODEV;
		goto err2;
	}
	clk_prepare_enable(s3c_ac97.ac97_clk);

	if (ac97_pdata->cfg_gpio(pdev)) {
		dev_err(&pdev->dev, "Unable to configure gpio\n");
		ret = -EINVAL;
		goto err3;
	}

	ret = request_irq(irq_res->start, s3c_ac97_irq,
					0, "AC97", NULL);
	if (ret < 0) {
		dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
		goto err4;
	}

	ret = snd_soc_set_ac97_ops(&s3c_ac97_ops);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
		goto err4;
	}

	ret = snd_soc_register_component(&pdev->dev, &s3c_ac97_component,
					 s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
	if (ret)
		goto err5;

	ret = asoc_dma_platform_register(&pdev->dev);
	if (ret) {
		dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
		goto err6;
	}

	return 0;
err6:
	snd_soc_unregister_component(&pdev->dev);
err5:
	free_irq(irq_res->start, NULL);
err4:
err3:
	clk_disable_unprepare(s3c_ac97.ac97_clk);
err2:
	snd_soc_set_ac97_ops(NULL);
	return ret;
}

static int s3c_ac97_remove(struct platform_device *pdev)
{
	struct resource *irq_res;

	asoc_dma_platform_unregister(&pdev->dev);
	snd_soc_unregister_component(&pdev->dev);

	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq_res)
		free_irq(irq_res->start, NULL);

	clk_disable_unprepare(s3c_ac97.ac97_clk);
	snd_soc_set_ac97_ops(NULL);

	return 0;
}

static struct platform_driver s3c_ac97_driver = {
	.probe  = s3c_ac97_probe,
	.remove = s3c_ac97_remove,
	.driver = {
		.name = "samsung-ac97",
		.owner = THIS_MODULE,
	},
};

module_platform_driver(s3c_ac97_driver);

MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-ac97");