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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 <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 

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