xref: /openbmc/linux/sound/soc/pxa/pxa2xx-pcm.c (revision 6aa7de05)
1 /*
2  * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
3  *
4  * Author:	Nicolas Pitre
5  * Created:	Nov 30, 2004
6  * Copyright:	(C) 2004 MontaVista Software, Inc.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 
13 #include <linux/dma-mapping.h>
14 #include <linux/module.h>
15 #include <linux/dmaengine.h>
16 #include <linux/of.h>
17 
18 #include <sound/core.h>
19 #include <sound/soc.h>
20 #include <sound/pxa2xx-lib.h>
21 #include <sound/dmaengine_pcm.h>
22 
23 #include "../../arm/pxa2xx-pcm.h"
24 
25 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
26 	struct snd_pcm_hw_params *params)
27 {
28 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
29 	struct snd_dmaengine_dai_dma_data *dma;
30 
31 	dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
32 
33 	/* return if this is a bufferless transfer e.g.
34 	 * codec <--> BT codec or GSM modem -- lg FIXME */
35 	if (!dma)
36 		return 0;
37 
38 	return __pxa2xx_pcm_hw_params(substream, params);
39 }
40 
41 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
42 {
43 	__pxa2xx_pcm_hw_free(substream);
44 
45 	return 0;
46 }
47 
48 static const struct snd_pcm_ops pxa2xx_pcm_ops = {
49 	.open		= __pxa2xx_pcm_open,
50 	.close		= __pxa2xx_pcm_close,
51 	.ioctl		= snd_pcm_lib_ioctl,
52 	.hw_params	= pxa2xx_pcm_hw_params,
53 	.hw_free	= pxa2xx_pcm_hw_free,
54 	.prepare	= __pxa2xx_pcm_prepare,
55 	.trigger	= pxa2xx_pcm_trigger,
56 	.pointer	= pxa2xx_pcm_pointer,
57 	.mmap		= pxa2xx_pcm_mmap,
58 };
59 
60 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
61 {
62 	struct snd_card *card = rtd->card->snd_card;
63 	struct snd_pcm *pcm = rtd->pcm;
64 	int ret;
65 
66 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
67 	if (ret)
68 		return ret;
69 
70 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
71 		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
72 			SNDRV_PCM_STREAM_PLAYBACK);
73 		if (ret)
74 			goto out;
75 	}
76 
77 	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
78 		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
79 			SNDRV_PCM_STREAM_CAPTURE);
80 		if (ret)
81 			goto out;
82 	}
83  out:
84 	return ret;
85 }
86 
87 static const struct snd_soc_platform_driver pxa2xx_soc_platform = {
88 	.ops		= &pxa2xx_pcm_ops,
89 	.pcm_new	= pxa2xx_soc_pcm_new,
90 	.pcm_free	= pxa2xx_pcm_free_dma_buffers,
91 };
92 
93 static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
94 {
95 	return devm_snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
96 }
97 
98 #ifdef CONFIG_OF
99 static const struct of_device_id snd_soc_pxa_audio_match[] = {
100 	{ .compatible   = "mrvl,pxa-pcm-audio" },
101 	{ }
102 };
103 MODULE_DEVICE_TABLE(of, snd_soc_pxa_audio_match);
104 #endif
105 
106 static struct platform_driver pxa_pcm_driver = {
107 	.driver = {
108 		.name = "pxa-pcm-audio",
109 		.of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
110 	},
111 
112 	.probe = pxa2xx_soc_platform_probe,
113 };
114 
115 module_platform_driver(pxa_pcm_driver);
116 
117 MODULE_AUTHOR("Nicolas Pitre");
118 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
119 MODULE_LICENSE("GPL");
120 MODULE_ALIAS("platform:pxa-pcm-audio");
121