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Linux/sound/soc/pxa/pxa2xx-pcm.c

  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 <mach/dma.h>
 19 
 20 #include <sound/core.h>
 21 #include <sound/soc.h>
 22 #include <sound/pxa2xx-lib.h>
 23 #include <sound/dmaengine_pcm.h>
 24 
 25 #include "../../arm/pxa2xx-pcm.h"
 26 
 27 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
 28         struct snd_pcm_hw_params *params)
 29 {
 30         struct snd_pcm_runtime *runtime = substream->runtime;
 31         struct pxa2xx_runtime_data *prtd = runtime->private_data;
 32         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 33         struct snd_dmaengine_dai_dma_data *dma;
 34         int ret;
 35 
 36         dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 37 
 38         /* return if this is a bufferless transfer e.g.
 39          * codec <--> BT codec or GSM modem -- lg FIXME */
 40         if (!dma)
 41                 return 0;
 42 
 43         /* this may get called several times by oss emulation
 44          * with different params */
 45         if (prtd->params == NULL) {
 46                 prtd->params = dma;
 47                 ret = pxa_request_dma("name", DMA_PRIO_LOW,
 48                               pxa2xx_pcm_dma_irq, substream);
 49                 if (ret < 0)
 50                         return ret;
 51                 prtd->dma_ch = ret;
 52         } else if (prtd->params != dma) {
 53                 pxa_free_dma(prtd->dma_ch);
 54                 prtd->params = dma;
 55                 ret = pxa_request_dma("name", DMA_PRIO_LOW,
 56                               pxa2xx_pcm_dma_irq, substream);
 57                 if (ret < 0)
 58                         return ret;
 59                 prtd->dma_ch = ret;
 60         }
 61 
 62         return __pxa2xx_pcm_hw_params(substream, params);
 63 }
 64 
 65 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 66 {
 67         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
 68 
 69         __pxa2xx_pcm_hw_free(substream);
 70 
 71         if (prtd->dma_ch >= 0) {
 72                 pxa_free_dma(prtd->dma_ch);
 73                 prtd->dma_ch = -1;
 74                 prtd->params = NULL;
 75         }
 76 
 77         return 0;
 78 }
 79 
 80 static struct snd_pcm_ops pxa2xx_pcm_ops = {
 81         .open           = __pxa2xx_pcm_open,
 82         .close          = __pxa2xx_pcm_close,
 83         .ioctl          = snd_pcm_lib_ioctl,
 84         .hw_params      = pxa2xx_pcm_hw_params,
 85         .hw_free        = pxa2xx_pcm_hw_free,
 86         .prepare        = __pxa2xx_pcm_prepare,
 87         .trigger        = pxa2xx_pcm_trigger,
 88         .pointer        = pxa2xx_pcm_pointer,
 89         .mmap           = pxa2xx_pcm_mmap,
 90 };
 91 
 92 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 93 {
 94         struct snd_card *card = rtd->card->snd_card;
 95         struct snd_pcm *pcm = rtd->pcm;
 96         int ret;
 97 
 98         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 99         if (ret)
100                 return ret;
101 
102         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
103                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
104                         SNDRV_PCM_STREAM_PLAYBACK);
105                 if (ret)
106                         goto out;
107         }
108 
109         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
110                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
111                         SNDRV_PCM_STREAM_CAPTURE);
112                 if (ret)
113                         goto out;
114         }
115  out:
116         return ret;
117 }
118 
119 static struct snd_soc_platform_driver pxa2xx_soc_platform = {
120         .ops    = &pxa2xx_pcm_ops,
121         .pcm_new        = pxa2xx_soc_pcm_new,
122         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
123 };
124 
125 static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
126 {
127         return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
128 }
129 
130 static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
131 {
132         snd_soc_unregister_platform(&pdev->dev);
133         return 0;
134 }
135 
136 #ifdef CONFIG_OF
137 static const struct of_device_id snd_soc_pxa_audio_match[] = {
138         { .compatible   = "mrvl,pxa-pcm-audio" },
139         { }
140 };
141 #endif
142 
143 static struct platform_driver pxa_pcm_driver = {
144         .driver = {
145                 .name = "pxa-pcm-audio",
146                 .owner = THIS_MODULE,
147                 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
148         },
149 
150         .probe = pxa2xx_soc_platform_probe,
151         .remove = pxa2xx_soc_platform_remove,
152 };
153 
154 module_platform_driver(pxa_pcm_driver);
155 
156 MODULE_AUTHOR("Nicolas Pitre");
157 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
158 MODULE_LICENSE("GPL");
159 

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