xref: /linux/sound/soc/pxa/pxa2xx-pcm.c (revision d91517839e5d95adc0cf4b28caa7af62a71de526)
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_pcm_runtime *runtime = substream->runtime;
29 	struct pxa2xx_runtime_data *prtd = runtime->private_data;
30 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
31 	struct snd_dmaengine_dai_dma_data *dma;
32 	int ret;
33 
34 	dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
35 
36 	/* return if this is a bufferless transfer e.g.
37 	 * codec <--> BT codec or GSM modem -- lg FIXME */
38 	if (!dma)
39 		return 0;
40 
41 	/* this may get called several times by oss emulation
42 	 * with different params */
43 	if (prtd->params == NULL) {
44 		prtd->params = dma;
45 		ret = pxa_request_dma("name", DMA_PRIO_LOW,
46 			      pxa2xx_pcm_dma_irq, substream);
47 		if (ret < 0)
48 			return ret;
49 		prtd->dma_ch = ret;
50 	} else if (prtd->params != dma) {
51 		pxa_free_dma(prtd->dma_ch);
52 		prtd->params = dma;
53 		ret = pxa_request_dma("name", DMA_PRIO_LOW,
54 			      pxa2xx_pcm_dma_irq, substream);
55 		if (ret < 0)
56 			return ret;
57 		prtd->dma_ch = ret;
58 	}
59 
60 	return __pxa2xx_pcm_hw_params(substream, params);
61 }
62 
63 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
64 {
65 	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
66 
67 	__pxa2xx_pcm_hw_free(substream);
68 
69 	if (prtd->dma_ch >= 0) {
70 		pxa_free_dma(prtd->dma_ch);
71 		prtd->dma_ch = -1;
72 		prtd->params = NULL;
73 	}
74 
75 	return 0;
76 }
77 
78 static struct snd_pcm_ops pxa2xx_pcm_ops = {
79 	.open		= __pxa2xx_pcm_open,
80 	.close		= __pxa2xx_pcm_close,
81 	.ioctl		= snd_pcm_lib_ioctl,
82 	.hw_params	= pxa2xx_pcm_hw_params,
83 	.hw_free	= pxa2xx_pcm_hw_free,
84 	.prepare	= __pxa2xx_pcm_prepare,
85 	.trigger	= pxa2xx_pcm_trigger,
86 	.pointer	= pxa2xx_pcm_pointer,
87 	.mmap		= pxa2xx_pcm_mmap,
88 };
89 
90 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
91 {
92 	struct snd_card *card = rtd->card->snd_card;
93 	struct snd_pcm *pcm = rtd->pcm;
94 	int ret;
95 
96 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
97 	if (ret)
98 		return ret;
99 
100 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
101 		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
102 			SNDRV_PCM_STREAM_PLAYBACK);
103 		if (ret)
104 			goto out;
105 	}
106 
107 	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
108 		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
109 			SNDRV_PCM_STREAM_CAPTURE);
110 		if (ret)
111 			goto out;
112 	}
113  out:
114 	return ret;
115 }
116 
117 static struct snd_soc_platform_driver pxa2xx_soc_platform = {
118 	.ops 	= &pxa2xx_pcm_ops,
119 	.pcm_new	= pxa2xx_soc_pcm_new,
120 	.pcm_free	= pxa2xx_pcm_free_dma_buffers,
121 };
122 
123 static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
124 {
125 	return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
126 }
127 
128 static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
129 {
130 	snd_soc_unregister_platform(&pdev->dev);
131 	return 0;
132 }
133 
134 #ifdef CONFIG_OF
135 static const struct of_device_id snd_soc_pxa_audio_match[] = {
136 	{ .compatible   = "mrvl,pxa-pcm-audio" },
137 	{ }
138 };
139 #endif
140 
141 static struct platform_driver pxa_pcm_driver = {
142 	.driver = {
143 		.name = "pxa-pcm-audio",
144 		.owner = THIS_MODULE,
145 		.of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
146 	},
147 
148 	.probe = pxa2xx_soc_platform_probe,
149 	.remove = pxa2xx_soc_platform_remove,
150 };
151 
152 module_platform_driver(pxa_pcm_driver);
153 
154 MODULE_AUTHOR("Nicolas Pitre");
155 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
156 MODULE_LICENSE("GPL");
157