summaryrefslogtreecommitdiff
path: root/sound/soc/s6000/s6000-i2s.c
blob: 5b9ac1759bd26021eb8570381a5dfd2eb5d7842c (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
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
/*
 * ALSA SoC I2S Audio Layer for the Stretch S6000 family
 *
 * Author:      Daniel Gloeckner, <dg@emlix.com>
 * Copyright:   (C) 2009 emlix GmbH <info@emlix.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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/slab.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "s6000-i2s.h"
#include "s6000-pcm.h"

struct s6000_i2s_dev {
	dma_addr_t sifbase;
	u8 __iomem *scbbase;
	unsigned int wide;
	unsigned int channel_in;
	unsigned int channel_out;
	unsigned int lines_in;
	unsigned int lines_out;
	struct s6000_pcm_dma_params dma_params;
};

#define S6_I2S_INTERRUPT_STATUS	0x00
#define   S6_I2S_INT_OVERRUN	1
#define   S6_I2S_INT_UNDERRUN	2
#define   S6_I2S_INT_ALIGNMENT	4
#define S6_I2S_INTERRUPT_ENABLE	0x04
#define S6_I2S_INTERRUPT_RAW	0x08
#define S6_I2S_INTERRUPT_CLEAR	0x0C
#define S6_I2S_INTERRUPT_SET	0x10
#define S6_I2S_MODE		0x20
#define   S6_I2S_DUAL		0
#define   S6_I2S_WIDE		1
#define S6_I2S_TX_DEFAULT	0x24
#define S6_I2S_DATA_CFG(c)	(0x40 + 0x10 * (c))
#define   S6_I2S_IN		0
#define   S6_I2S_OUT		1
#define   S6_I2S_UNUSED		2
#define S6_I2S_INTERFACE_CFG(c)	(0x44 + 0x10 * (c))
#define   S6_I2S_DIV_MASK	0x001fff
#define   S6_I2S_16BIT		0x000000
#define   S6_I2S_20BIT		0x002000
#define   S6_I2S_24BIT		0x004000
#define   S6_I2S_32BIT		0x006000
#define   S6_I2S_BITS_MASK	0x006000
#define   S6_I2S_MEM_16BIT	0x000000
#define   S6_I2S_MEM_32BIT	0x008000
#define   S6_I2S_MEM_MASK	0x008000
#define   S6_I2S_CHANNELS_SHIFT	16
#define   S6_I2S_CHANNELS_MASK	0x030000
#define   S6_I2S_SCK_IN		0x000000
#define   S6_I2S_SCK_OUT	0x040000
#define   S6_I2S_SCK_DIR	0x040000
#define   S6_I2S_WS_IN		0x000000
#define   S6_I2S_WS_OUT		0x080000
#define   S6_I2S_WS_DIR		0x080000
#define   S6_I2S_LEFT_FIRST	0x000000
#define   S6_I2S_RIGHT_FIRST	0x100000
#define   S6_I2S_FIRST		0x100000
#define   S6_I2S_CUR_SCK	0x200000
#define   S6_I2S_CUR_WS		0x400000
#define S6_I2S_ENABLE(c)	(0x48 + 0x10 * (c))
#define   S6_I2S_DISABLE_IF	0x02
#define   S6_I2S_ENABLE_IF	0x03
#define   S6_I2S_IS_BUSY	0x04
#define   S6_I2S_DMA_ACTIVE	0x08
#define   S6_I2S_IS_ENABLED	0x10

#define S6_I2S_NUM_LINES	4

#define S6_I2S_SIF_PORT0	0x0000000
#define S6_I2S_SIF_PORT1	0x0000080 /* docs say 0x0000010 */

static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
{
	writel(val, dev->scbbase + reg);
}

static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
{
	return readl(dev->scbbase + reg);
}

static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
				  u32 mask, u32 val)
{
	val ^= s6_i2s_read_reg(dev, reg) & ~mask;
	s6_i2s_write_reg(dev, reg, val);
}

static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
{
	int i, j, cur, prev;

	/*
	 * Wait for WCLK to toggle 5 times before enabling the channel
	 * s6000 Family Datasheet 3.6.4:
	 *   "At least two cycles of WS must occur between commands
	 *    to disable or enable the interface"
	 */
	j = 0;
	prev = ~S6_I2S_CUR_WS;
	for (i = 1000000; --i && j < 6; ) {
		cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
		       & S6_I2S_CUR_WS;
		if (prev != cur) {
			prev = cur;
			j++;
		}
	}
	if (j < 6)
		printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");

	s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
}

static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
{
	s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
}

static void s6000_i2s_start(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
	int channel;

	channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
			dev->channel_out : dev->channel_in;

	s6000_i2s_start_channel(dev, channel);
}

static void s6000_i2s_stop(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
	int channel;

	channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
			dev->channel_out : dev->channel_in;

	s6000_i2s_stop_channel(dev, channel);
}

static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			     int after)
{
	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) ^ !after)
			s6000_i2s_start(substream);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (!after)
			s6000_i2s_stop(substream);
	}
	return 0;
}

static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
{
	unsigned int pending;
	pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
	pending &= S6_I2S_INT_ALIGNMENT |
		   S6_I2S_INT_UNDERRUN |
		   S6_I2S_INT_OVERRUN;
	s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);

	return pending;
}

static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
{
	struct s6000_i2s_dev *dev = cpu_dai->private_data;
	unsigned int errors;
	unsigned int ret;

	errors = s6000_i2s_int_sources(dev);
	if (likely(!errors))
		return 0;

	ret = 0;
	if (errors & S6_I2S_INT_ALIGNMENT)
		printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
	if (errors & S6_I2S_INT_UNDERRUN)
		ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
	if (errors & S6_I2S_INT_OVERRUN)
		ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
	return ret;
}

static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
{
	int channel;
	int n = 50;
	for (channel = 0; channel < 2; channel++) {
		while (--n >= 0) {
			int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
			if ((v & S6_I2S_IS_ENABLED)
			    || !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
				break;
			udelay(20);
		}
	}
	if (n < 0)
		printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
}

static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
				   unsigned int fmt)
{
	struct s6000_i2s_dev *dev = cpu_dai->private_data;
	u32 w;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
		break;
	case SND_SOC_DAIFMT_CBS_CFM:
		w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
		break;
	case SND_SOC_DAIFMT_CBM_CFS:
		w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		w |= S6_I2S_LEFT_FIRST;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		w |= S6_I2S_RIGHT_FIRST;
		break;
	default:
		return -EINVAL;
	}

	s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
		       S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
	s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
		       S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);

	return 0;
}

static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
{
	struct s6000_i2s_dev *dev = dai->private_data;

	if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
		return -EINVAL;

	s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
		       S6_I2S_DIV_MASK, div / 2 - 1);
	return 0;
}

static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
			       struct snd_pcm_hw_params *params,
			       struct snd_soc_dai *dai)
{
	struct s6000_i2s_dev *dev = dai->private_data;
	int interf;
	u32 w = 0;

	if (dev->wide)
		interf = 0;
	else {
		w |= (((params_channels(params) - 2) / 2)
		      << S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
		interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
				? dev->channel_out : dev->channel_in;
	}

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
		break;
	default:
		printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
		       params_format(params));
		return -EINVAL;
	}

	if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
	     & S6_I2S_IS_ENABLED) {
		printk(KERN_ERR "s6000-i2s: interface already enabled\n");
		return -EBUSY;
	}

	s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
		       S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
		       w);

	return 0;
}

static int s6000_i2s_dai_probe(struct platform_device *pdev,
			       struct snd_soc_dai *dai)
{
	struct s6000_i2s_dev *dev = dai->private_data;
	struct s6000_snd_platform_data *pdata = pdev->dev.platform_data;

	if (!pdata)
		return -EINVAL;

	dev->wide = pdata->wide;
	dev->channel_in = pdata->channel_in;
	dev->channel_out = pdata->channel_out;
	dev->lines_in = pdata->lines_in;
	dev->lines_out = pdata->lines_out;

	s6_i2s_write_reg(dev, S6_I2S_MODE,
			 dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);

	if (dev->wide) {
		int i;

		if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
			return -EINVAL;

		dev->channel_in = 0;
		dev->channel_out = 1;
		dai->capture.channels_min = 2 * dev->lines_in;
		dai->capture.channels_max = dai->capture.channels_min;
		dai->playback.channels_min = 2 * dev->lines_out;
		dai->playback.channels_max = dai->playback.channels_min;

		for (i = 0; i < dev->lines_out; i++)
			s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);

		for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
			s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
					 S6_I2S_UNUSED);

		for (; i < S6_I2S_NUM_LINES; i++)
			s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
	} else {
		unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};

		if (dev->lines_in > 1 || dev->lines_out > 1)
			return -EINVAL;

		dai->capture.channels_min = 2 * dev->lines_in;
		dai->capture.channels_max = 8 * dev->lines_in;
		dai->playback.channels_min = 2 * dev->lines_out;
		dai->playback.channels_max = 8 * dev->lines_out;

		if (dev->lines_in)
			cfg[dev->channel_in] = S6_I2S_IN;
		if (dev->lines_out)
			cfg[dev->channel_out] = S6_I2S_OUT;

		s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
		s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
	}

	if (dev->lines_out) {
		if (dev->lines_in) {
			if (!dev->dma_params.dma_out)
				return -ENODEV;
		} else {
			dev->dma_params.dma_out = dev->dma_params.dma_in;
			dev->dma_params.dma_in = 0;
		}
	}
	dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
					S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
	dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
					S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
	dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
	return 0;
}

#define S6000_I2S_RATES	(SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
			 SNDRV_PCM_RATE_8000_192000)
#define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
	.set_fmt = s6000_i2s_set_dai_fmt,
	.set_clkdiv = s6000_i2s_set_clkdiv,
	.hw_params = s6000_i2s_hw_params,
};

struct snd_soc_dai s6000_i2s_dai = {
	.name = "s6000-i2s",
	.id = 0,
	.probe = s6000_i2s_dai_probe,
	.playback = {
		.channels_min = 2,
		.channels_max = 8,
		.formats = S6000_I2S_FORMATS,
		.rates = S6000_I2S_RATES,
		.rate_min = 0,
		.rate_max = 1562500,
	},
	.capture = {
		.channels_min = 2,
		.channels_max = 8,
		.formats = S6000_I2S_FORMATS,
		.rates = S6000_I2S_RATES,
		.rate_min = 0,
		.rate_max = 1562500,
	},
	.ops = &s6000_i2s_dai_ops,
}
EXPORT_SYMBOL_GPL(s6000_i2s_dai);

static int __devinit s6000_i2s_probe(struct platform_device *pdev)
{
	struct s6000_i2s_dev *dev;
	struct resource *scbmem, *sifmem, *region, *dma1, *dma2;
	u8 __iomem *mmio;
	int ret;

	scbmem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!scbmem) {
		dev_err(&pdev->dev, "no mem resource?\n");
		ret = -ENODEV;
		goto err_release_none;
	}

	region = request_mem_region(scbmem->start,
				    scbmem->end - scbmem->start + 1,
				    pdev->name);
	if (!region) {
		dev_err(&pdev->dev, "I2S SCB region already claimed\n");
		ret = -EBUSY;
		goto err_release_none;
	}

	mmio = ioremap(scbmem->start, scbmem->end - scbmem->start + 1);
	if (!mmio) {
		dev_err(&pdev->dev, "can't ioremap SCB region\n");
		ret = -ENOMEM;
		goto err_release_scb;
	}

	sifmem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!sifmem) {
		dev_err(&pdev->dev, "no second mem resource?\n");
		ret = -ENODEV;
		goto err_release_map;
	}

	region = request_mem_region(sifmem->start,
				    sifmem->end - sifmem->start + 1,
				    pdev->name);
	if (!region) {
		dev_err(&pdev->dev, "I2S SIF region already claimed\n");
		ret = -EBUSY;
		goto err_release_map;
	}

	dma1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dma1) {
		dev_err(&pdev->dev, "no dma resource?\n");
		ret = -ENODEV;
		goto err_release_sif;
	}

	region = request_mem_region(dma1->start, dma1->end - dma1->start + 1,
				    pdev->name);
	if (!region) {
		dev_err(&pdev->dev, "I2S DMA region already claimed\n");
		ret = -EBUSY;
		goto err_release_sif;
	}

	dma2 = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (dma2) {
		region = request_mem_region(dma2->start,
					    dma2->end - dma2->start + 1,
					    pdev->name);
		if (!region) {
			dev_err(&pdev->dev,
				"I2S DMA region already claimed\n");
			ret = -EBUSY;
			goto err_release_dma1;
		}
	}

	dev = kzalloc(sizeof(struct s6000_i2s_dev), GFP_KERNEL);
	if (!dev) {
		ret = -ENOMEM;
		goto err_release_dma2;
	}

	s6000_i2s_dai.dev = &pdev->dev;
	s6000_i2s_dai.private_data = dev;
	s6000_i2s_dai.capture.dma_data = &dev->dma_params;
	s6000_i2s_dai.playback.dma_data = &dev->dma_params;

	dev->sifbase = sifmem->start;
	dev->scbbase = mmio;

	s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
	s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR,
			 S6_I2S_INT_ALIGNMENT |
			 S6_I2S_INT_UNDERRUN |
			 S6_I2S_INT_OVERRUN);

	s6000_i2s_stop_channel(dev, 0);
	s6000_i2s_stop_channel(dev, 1);
	s6000_i2s_wait_disabled(dev);

	dev->dma_params.check_xrun = s6000_i2s_check_xrun;
	dev->dma_params.trigger = s6000_i2s_trigger;
	dev->dma_params.dma_in = dma1->start;
	dev->dma_params.dma_out = dma2 ? dma2->start : 0;
	dev->dma_params.irq = platform_get_irq(pdev, 0);
	if (dev->dma_params.irq < 0) {
		dev_err(&pdev->dev, "no irq resource?\n");
		ret = -ENODEV;
		goto err_release_dev;
	}

	s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE,
			 S6_I2S_INT_ALIGNMENT |
			 S6_I2S_INT_UNDERRUN |
			 S6_I2S_INT_OVERRUN);

	ret = snd_soc_register_dai(&s6000_i2s_dai);
	if (ret)
		goto err_release_dev;

	return 0;

err_release_dev:
	kfree(dev);
err_release_dma2:
	if (dma2)
		release_mem_region(dma2->start, dma2->end - dma2->start + 1);
err_release_dma1:
	release_mem_region(dma1->start, dma1->end - dma1->start + 1);
err_release_sif:
	release_mem_region(sifmem->start, (sifmem->end - sifmem->start) + 1);
err_release_map:
	iounmap(mmio);
err_release_scb:
	release_mem_region(scbmem->start, (scbmem->end - scbmem->start) + 1);
err_release_none:
	return ret;
}

static void __devexit s6000_i2s_remove(struct platform_device *pdev)
{
	struct s6000_i2s_dev *dev = s6000_i2s_dai.private_data;
	struct resource *region;
	void __iomem *mmio = dev->scbbase;

	snd_soc_unregister_dai(&s6000_i2s_dai);

	s6000_i2s_stop_channel(dev, 0);
	s6000_i2s_stop_channel(dev, 1);

	s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
	s6000_i2s_dai.private_data = 0;
	kfree(dev);

	region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	release_mem_region(region->start, region->end - region->start + 1);

	region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (region)
		release_mem_region(region->start,
				   region->end - region->start + 1);

	region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(region->start, (region->end - region->start) + 1);

	iounmap(mmio);
	region = platform_get_resource(pdev, IORESOURCE_IO, 0);
	release_mem_region(region->start, (region->end - region->start) + 1);
}

static struct platform_driver s6000_i2s_driver = {
	.probe  = s6000_i2s_probe,
	.remove = __devexit_p(s6000_i2s_remove),
	.driver = {
		.name   = "s6000-i2s",
		.owner  = THIS_MODULE,
	},
};

static int __init s6000_i2s_init(void)
{
	return platform_driver_register(&s6000_i2s_driver);
}
module_init(s6000_i2s_init);

static void __exit s6000_i2s_exit(void)
{
	platform_driver_unregister(&s6000_i2s_driver);
}
module_exit(s6000_i2s_exit);

MODULE_AUTHOR("Daniel Gloeckner");
MODULE_DESCRIPTION("Stretch s6000 family I2S SoC Interface");
MODULE_LICENSE("GPL");