summaryrefslogtreecommitdiffstats
path: root/sound/soc/fsl/mpc8610_hpcd.c
blob: bcec3f60bad99d8e5e885ebe9646ed942ebd1ec4 (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
/**
 * Freescale MPC8610HPCD ALSA SoC Fabric driver
 *
 * Author: Timur Tabi <timur@freescale.com>
 *
 * Copyright 2007-2008 Freescale Semiconductor, Inc.  This file is licensed
 * under the terms of the GNU General Public License version 2.  This
 * program is licensed "as is" without any warranty of any kind, whether
 * express or implied.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <sound/soc.h>
#include <asm/immap_86xx.h>

#include "../codecs/cs4270.h"
#include "fsl_dma.h"
#include "fsl_ssi.h"

/**
 * mpc8610_hpcd_data: fabric-specific ASoC device data
 *
 * This structure contains data for a single sound platform device on an
 * MPC8610 HPCD.  Some of the data is taken from the device tree.
 */
struct mpc8610_hpcd_data {
	struct snd_soc_device sound_devdata;
	struct snd_soc_dai_link dai;
	struct snd_soc_card machine;
	unsigned int dai_format;
	unsigned int codec_clk_direction;
	unsigned int cpu_clk_direction;
	unsigned int clk_frequency;
	struct ccsr_guts __iomem *guts;
	struct ccsr_ssi __iomem *ssi;
	unsigned int ssi_id;    	/* 0 = SSI1, 1 = SSI2, etc */
	unsigned int ssi_irq;
	unsigned int dma_id;    	/* 0 = DMA1, 1 = DMA2, etc */
	unsigned int dma_irq[2];
	struct ccsr_dma_channel __iomem *dma[2];
	unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
};

/**
 * mpc8610_hpcd_machine_probe: initalize the board
 *
 * This function is called when platform_device_add() is called.  It is used
 * to initialize the board-specific hardware.
 *
 * Here we program the DMACR and PMUXCR registers.
 */
static int mpc8610_hpcd_machine_probe(struct platform_device *sound_device)
{
	struct mpc8610_hpcd_data *machine_data =
		sound_device->dev.platform_data;

	/* Program the signal routing between the SSI and the DMA */
	guts_set_dmacr(machine_data->guts, machine_data->dma_id,
		machine_data->dma_channel_id[0], CCSR_GUTS_DMACR_DEV_SSI);
	guts_set_dmacr(machine_data->guts, machine_data->dma_id,
		machine_data->dma_channel_id[1], CCSR_GUTS_DMACR_DEV_SSI);

	guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
		machine_data->dma_channel_id[0], 0);
	guts_set_pmuxcr_dma(machine_data->guts, machine_data->dma_id,
		machine_data->dma_channel_id[1], 0);

	switch (machine_data->ssi_id) {
	case 0:
		clrsetbits_be32(&machine_data->guts->pmuxcr,
			CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
		break;
	case 1:
		clrsetbits_be32(&machine_data->guts->pmuxcr,
			CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
		break;
	}

	return 0;
}

/**
 * mpc8610_hpcd_startup: program the board with various hardware parameters
 *
 * This function takes board-specific information, like clock frequencies
 * and serial data formats, and passes that information to the codec and
 * transport drivers.
 */
static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
	struct mpc8610_hpcd_data *machine_data =
		rtd->socdev->dev->platform_data;
	int ret = 0;

	/* Tell the CPU driver what the serial protocol is. */
	ret = snd_soc_dai_set_fmt(cpu_dai, machine_data->dai_format);
	if (ret < 0) {
		dev_err(substream->pcm->card->dev,
			"could not set CPU driver audio format\n");
		return ret;
	}

	/* Tell the codec driver what the serial protocol is. */
	ret = snd_soc_dai_set_fmt(codec_dai, machine_data->dai_format);
	if (ret < 0) {
		dev_err(substream->pcm->card->dev,
			"could not set codec driver audio format\n");
		return ret;
	}

	/*
	 * Tell the CPU driver what the clock frequency is, and whether it's a
	 * slave or master.
	 */
	ret = snd_soc_dai_set_sysclk(cpu_dai, 0,
					machine_data->clk_frequency,
					machine_data->cpu_clk_direction);
	if (ret < 0) {
		dev_err(substream->pcm->card->dev,
			"could not set CPU driver clock parameters\n");
		return ret;
	}

	/*
	 * Tell the codec driver what the MCLK frequency is, and whether it's
	 * a slave or master.
	 */
	ret = snd_soc_dai_set_sysclk(codec_dai, 0,
					machine_data->clk_frequency,
					machine_data->codec_clk_direction);
	if (ret < 0) {
		dev_err(substream->pcm->card->dev,
			"could not set codec driver clock params\n");
		return ret;
	}

	return 0;
}

/**
 * mpc8610_hpcd_machine_remove: Remove the sound device
 *
 * This function is called to remove the sound device for one SSI.  We
 * de-program the DMACR and PMUXCR register.
 */
int mpc8610_hpcd_machine_remove(struct platform_device *sound_device)
{
	struct mpc8610_hpcd_data *machine_data =
		sound_device->dev.platform_data;

	/* Restore the signal routing */

	guts_set_dmacr(machine_data->guts, machine_data->dma_id,
		machine_data->dma_channel_id[0], 0);
	guts_set_dmacr(machine_data->guts, machine_data->dma_id,
		machine_data->dma_channel_id[1], 0);

	switch (machine_data->ssi_id) {
	case 0:
		clrsetbits_be32(&machine_data->guts->pmuxcr,
			CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
		break;
	case 1:
		clrsetbits_be32(&machine_data->guts->pmuxcr,
			CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
		break;
	}

	return 0;
}

/**
 * mpc8610_hpcd_ops: ASoC fabric driver operations
 */
static struct snd_soc_ops mpc8610_hpcd_ops = {
	.startup = mpc8610_hpcd_startup,
};

/**
 * mpc8610_hpcd_machine: ASoC machine data
 */
static struct snd_soc_card mpc8610_hpcd_machine = {
	.probe = mpc8610_hpcd_machine_probe,
	.remove = mpc8610_hpcd_machine_remove,
	.name = "MPC8610 HPCD",
	.num_links = 1,
};

/**
 * mpc8610_hpcd_probe: OF probe function for the fabric driver
 *
 * This function gets called when an SSI node is found in the device tree.
 *
 * Although this is a fabric driver, the SSI node is the "master" node with
 * respect to audio hardware connections.  Therefore, we create a new ASoC
 * device for each new SSI node that has a codec attached.
 *
 * FIXME: Currently, we only support one DMA controller, so if there are
 * multiple SSI nodes with codecs, only the first will be supported.
 *
 * FIXME: Even if we did support multiple DMA controllers, we have no
 * mechanism for assigning DMA controllers and channels to the individual
 * SSI devices.  We also probably aren't compatible with the generic Elo DMA
 * device driver.
 */
static int mpc8610_hpcd_probe(struct of_device *ofdev,
	const struct of_device_id *match)
{
	struct device_node *np = ofdev->node;
	struct device_node *codec_np = NULL;
	struct device_node *guts_np = NULL;
	struct device_node *dma_np = NULL;
	struct device_node *dma_channel_np = NULL;
	const phandle *codec_ph;
	const char *sprop;
	const u32 *iprop;
	struct resource res;
	struct platform_device *sound_device = NULL;
	struct mpc8610_hpcd_data *machine_data;
	struct fsl_ssi_info ssi_info;
	struct fsl_dma_info dma_info;
	int ret = -ENODEV;
	unsigned int playback_dma_channel;
	unsigned int capture_dma_channel;

	machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
	if (!machine_data)
		return -ENOMEM;

	memset(&ssi_info, 0, sizeof(ssi_info));
	memset(&dma_info, 0, sizeof(dma_info));

	ssi_info.dev = &ofdev->dev;

	/*
	 * We are only interested in SSIs with a codec phandle in them, so let's
	 * make sure this SSI has one.
	 */
	codec_ph = of_get_property(np, "codec-handle", NULL);
	if (!codec_ph)
		goto error;

	codec_np = of_find_node_by_phandle(*codec_ph);
	if (!codec_np)
		goto error;

	/* The MPC8610 HPCD only knows about the CS4270 codec, so reject
	   anything else. */
	if (!of_device_is_compatible(codec_np, "cirrus,cs4270"))
		goto error;

	/* Get the device ID */
	iprop = of_get_property(np, "cell-index", NULL);
	if (!iprop) {
		dev_err(&ofdev->dev, "cell-index property not found\n");
		ret = -EINVAL;
		goto error;
	}
	machine_data->ssi_id = *iprop;
	ssi_info.id = *iprop;

	/* Get the serial format and clock direction. */
	sprop = of_get_property(np, "fsl,mode", NULL);
	if (!sprop) {
		dev_err(&ofdev->dev, "fsl,mode property not found\n");
		ret = -EINVAL;
		goto error;
	}

	if (strcasecmp(sprop, "i2s-slave") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_I2S;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;

		/*
		 * In i2s-slave mode, the codec has its own clock source, so we
		 * need to get the frequency from the device tree and pass it to
		 * the codec driver.
		 */
		iprop = of_get_property(codec_np, "clock-frequency", NULL);
		if (!iprop || !*iprop) {
			dev_err(&ofdev->dev, "codec bus-frequency property "
				"is missing or invalid\n");
			ret = -EINVAL;
			goto error;
		}
		machine_data->clk_frequency = *iprop;
	} else if (strcasecmp(sprop, "i2s-master") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_I2S;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "lj-slave") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "lj-master") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_LEFT_J;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "rj-slave") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "rj-master") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_RIGHT_J;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "ac97-slave") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_AC97;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "ac97-master") == 0) {
		machine_data->dai_format = SND_SOC_DAIFMT_AC97;
		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else {
		dev_err(&ofdev->dev,
			"unrecognized fsl,mode property \"%s\"\n", sprop);
		ret = -EINVAL;
		goto error;
	}

	if (!machine_data->clk_frequency) {
		dev_err(&ofdev->dev, "unknown clock frequency\n");
		ret = -EINVAL;
		goto error;
	}

	/* Read the SSI information from the device tree */
	ret = of_address_to_resource(np, 0, &res);
	if (ret) {
		dev_err(&ofdev->dev, "could not obtain SSI address\n");
		goto error;
	}
	if (!res.start) {
		dev_err(&ofdev->dev, "invalid SSI address\n");
		goto error;
	}
	ssi_info.ssi_phys = res.start;

	machine_data->ssi = ioremap(ssi_info.ssi_phys, sizeof(struct ccsr_ssi));
	if (!machine_data->ssi) {
		dev_err(&ofdev->dev, "could not map SSI address %x\n",
			ssi_info.ssi_phys);
		ret = -EINVAL;
		goto error;
	}
	ssi_info.ssi = machine_data->ssi;


	/* Get the IRQ of the SSI */
	machine_data->ssi_irq = irq_of_parse_and_map(np, 0);
	if (!machine_data->ssi_irq) {
		dev_err(&ofdev->dev, "could not get SSI IRQ\n");
		ret = -EINVAL;
		goto error;
	}
	ssi_info.irq = machine_data->ssi_irq;


	/* Map the global utilities registers. */
	guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
	if (!guts_np) {
		dev_err(&ofdev->dev, "could not obtain address of GUTS\n");
		ret = -EINVAL;
		goto error;
	}
	machine_data->guts = of_iomap(guts_np, 0);
	of_node_put(guts_np);
	if (!machine_data->guts) {
		dev_err(&ofdev->dev, "could not map GUTS\n");
		ret = -EINVAL;
		goto error;
	}

	/* Find the DMA channels to use.  Both SSIs need to use the same DMA
	 * controller, so let's use DMA#1.
	 */
	for_each_compatible_node(dma_np, NULL, "fsl,mpc8610-dma") {
		iprop = of_get_property(dma_np, "cell-index", NULL);
		if (iprop && (*iprop == 0)) {
			of_node_put(dma_np);
			break;
		}
	}
	if (!dma_np) {
		dev_err(&ofdev->dev, "could not find DMA node\n");
		ret = -EINVAL;
		goto error;
	}
	machine_data->dma_id = *iprop;

	/* SSI1 needs to use DMA Channels 0 and 1, and SSI2 needs to use DMA
	 * channels 2 and 3.  This is just how the MPC8610 is wired
	 * internally.
	 */
	playback_dma_channel = (machine_data->ssi_id == 0) ? 0 : 2;
	capture_dma_channel = (machine_data->ssi_id == 0) ? 1 : 3;

	/*
	 * Find the DMA channels to use.
	 */
	while ((dma_channel_np = of_get_next_child(dma_np, dma_channel_np))) {
		iprop = of_get_property(dma_channel_np, "cell-index", NULL);
		if (iprop && (*iprop == playback_dma_channel)) {
			/* dma_channel[0] and dma_irq[0] are for playback */
			dma_info.dma_channel[0] = of_iomap(dma_channel_np, 0);
			dma_info.dma_irq[0] =
				irq_of_parse_and_map(dma_channel_np, 0);
			machine_data->dma_channel_id[0] = *iprop;
			continue;
		}
		if (iprop && (*iprop == capture_dma_channel)) {
			/* dma_channel[1] and dma_irq[1] are for capture */
			dma_info.dma_channel[1] = of_iomap(dma_channel_np, 0);
			dma_info.dma_irq[1] =
				irq_of_parse_and_map(dma_channel_np, 0);
			machine_data->dma_channel_id[1] = *iprop;
			continue;
		}
	}
	if (!dma_info.dma_channel[0] || !dma_info.dma_channel[1] ||
	    !dma_info.dma_irq[0] || !dma_info.dma_irq[1]) {
		dev_err(&ofdev->dev, "could not find DMA channels\n");
		ret = -EINVAL;
		goto error;
	}

	dma_info.ssi_stx_phys = ssi_info.ssi_phys +
		offsetof(struct ccsr_ssi, stx0);
	dma_info.ssi_srx_phys = ssi_info.ssi_phys +
		offsetof(struct ccsr_ssi, srx0);

	/* We have the DMA information, so tell the DMA driver what it is */
	if (!fsl_dma_configure(&dma_info)) {
		dev_err(&ofdev->dev, "could not instantiate DMA device\n");
		ret = -EBUSY;
		goto error;
	}

	/*
	 * Initialize our DAI data structure.  We should probably get this
	 * information from the device tree.
	 */
	machine_data->dai.name = "CS4270";
	machine_data->dai.stream_name = "CS4270";

	machine_data->dai.cpu_dai = fsl_ssi_create_dai(&ssi_info);
	machine_data->dai.codec_dai = &cs4270_dai; /* The codec_dai we want */
	machine_data->dai.ops = &mpc8610_hpcd_ops;

	mpc8610_hpcd_machine.dai_link = &machine_data->dai;

	/* Allocate a new audio platform device structure */
	sound_device = platform_device_alloc("soc-audio", -1);
	if (!sound_device) {
		dev_err(&ofdev->dev, "platform device allocation failed\n");
		ret = -ENOMEM;
		goto error;
	}

	machine_data->sound_devdata.card = &mpc8610_hpcd_machine;
	machine_data->sound_devdata.codec_dev = &soc_codec_device_cs4270;
	machine_data->machine.platform = &fsl_soc_platform;

	sound_device->dev.platform_data = machine_data;


	/* Set the platform device and ASoC device to point to each other */
	platform_set_drvdata(sound_device, &machine_data->sound_devdata);

	machine_data->sound_devdata.dev = &sound_device->dev;


	/* Tell ASoC to probe us.  This will call mpc8610_hpcd_machine.probe(),
	   if it exists. */
	ret = platform_device_add(sound_device);

	if (ret) {
		dev_err(&ofdev->dev, "platform device add failed\n");
		goto error;
	}

	dev_set_drvdata(&ofdev->dev, sound_device);

	return 0;

error:
	of_node_put(codec_np);
	of_node_put(guts_np);
	of_node_put(dma_np);
	of_node_put(dma_channel_np);

	if (sound_device)
		platform_device_unregister(sound_device);

	if (machine_data->dai.cpu_dai)
		fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);

	if (ssi_info.ssi)
		iounmap(ssi_info.ssi);

	if (ssi_info.irq)
		irq_dispose_mapping(ssi_info.irq);

	if (dma_info.dma_channel[0])
		iounmap(dma_info.dma_channel[0]);

	if (dma_info.dma_channel[1])
		iounmap(dma_info.dma_channel[1]);

	if (dma_info.dma_irq[0])
		irq_dispose_mapping(dma_info.dma_irq[0]);

	if (dma_info.dma_irq[1])
		irq_dispose_mapping(dma_info.dma_irq[1]);

	if (machine_data->guts)
		iounmap(machine_data->guts);

	kfree(machine_data);

	return ret;
}

/**
 * mpc8610_hpcd_remove: remove the OF device
 *
 * This function is called when the OF device is removed.
 */
static int mpc8610_hpcd_remove(struct of_device *ofdev)
{
	struct platform_device *sound_device = dev_get_drvdata(&ofdev->dev);
	struct mpc8610_hpcd_data *machine_data =
		sound_device->dev.platform_data;

	platform_device_unregister(sound_device);

	if (machine_data->dai.cpu_dai)
		fsl_ssi_destroy_dai(machine_data->dai.cpu_dai);

	if (machine_data->ssi)
		iounmap(machine_data->ssi);

	if (machine_data->dma[0])
		iounmap(machine_data->dma[0]);

	if (machine_data->dma[1])
		iounmap(machine_data->dma[1]);

	if (machine_data->dma_irq[0])
		irq_dispose_mapping(machine_data->dma_irq[0]);

	if (machine_data->dma_irq[1])
		irq_dispose_mapping(machine_data->dma_irq[1]);

	if (machine_data->guts)
		iounmap(machine_data->guts);

	kfree(machine_data);
	sound_device->dev.platform_data = NULL;

	dev_set_drvdata(&ofdev->dev, NULL);

	return 0;
}

static struct of_device_id mpc8610_hpcd_match[] = {
	{
		.compatible = "fsl,mpc8610-ssi",
	},
	{}
};
MODULE_DEVICE_TABLE(of, mpc8610_hpcd_match);

static struct of_platform_driver mpc8610_hpcd_of_driver = {
	.owner  	= THIS_MODULE,
	.name   	= "mpc8610_hpcd",
	.match_table    = mpc8610_hpcd_match,
	.probe  	= mpc8610_hpcd_probe,
	.remove 	= mpc8610_hpcd_remove,
};

/**
 * mpc8610_hpcd_init: fabric driver initialization.
 *
 * This function is called when this module is loaded.
 */
static int __init mpc8610_hpcd_init(void)
{
	int ret;

	printk(KERN_INFO "Freescale MPC8610 HPCD ALSA SoC fabric driver\n");

	ret = of_register_platform_driver(&mpc8610_hpcd_of_driver);

	if (ret)
		printk(KERN_ERR
			"mpc8610-hpcd: failed to register platform driver\n");

	return ret;
}

/**
 * mpc8610_hpcd_exit: fabric driver exit
 *
 * This function is called when this driver is unloaded.
 */
static void __exit mpc8610_hpcd_exit(void)
{
	of_unregister_platform_driver(&mpc8610_hpcd_of_driver);
}

module_init(mpc8610_hpcd_init);
module_exit(mpc8610_hpcd_exit);

MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC fabric driver");
MODULE_LICENSE("GPL");