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
  16 #include <sound/core.h>
  17 #include <sound/soc.h>
  18 #include <sound/pxa2xx-lib.h>
  19
  20 #include "../../arm/pxa2xx-pcm.h"
  21
  22 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  23         struct snd_pcm_hw_params *params)
  24 {
  25         struct snd_pcm_runtime *runtime = substream->runtime;
  26         struct pxa2xx_runtime_data *prtd = runtime->private_data;
  27         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  28         struct pxa2xx_pcm_dma_params *dma;
  29         int ret;
  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         /* this may get called several times by oss emulation
  39          * with different params */
  40         if (prtd->params == NULL) {
  41                 prtd->params = dma;
  42                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  43                               pxa2xx_pcm_dma_irq, substream);
  44                 if (ret < 0)
  45                         return ret;
  46                 prtd->dma_ch = ret;
  47         } else if (prtd->params != dma) {
  48                 pxa_free_dma(prtd->dma_ch);
  49                 prtd->params = dma;
  50                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  51                               pxa2xx_pcm_dma_irq, substream);
  52                 if (ret < 0)
  53                         return ret;
  54                 prtd->dma_ch = ret;
  55         }
  56
  57         return __pxa2xx_pcm_hw_params(substream, params);
  58 }
  59
  60 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  61 {
  62         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  63
  64         __pxa2xx_pcm_hw_free(substream);
  65
  66         if (prtd->dma_ch >= 0) {
  67                 pxa_free_dma(prtd->dma_ch);
  68                 prtd->dma_ch = -1;
  69                 prtd->params = NULL;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  76         .open           = __pxa2xx_pcm_open,
  77         .close          = __pxa2xx_pcm_close,
  78         .ioctl          = snd_pcm_lib_ioctl,
  79         .hw_params      = pxa2xx_pcm_hw_params,
  80         .hw_free        = pxa2xx_pcm_hw_free,
  81         .prepare        = __pxa2xx_pcm_prepare,
  82         .trigger        = pxa2xx_pcm_trigger,
  83         .pointer        = pxa2xx_pcm_pointer,
  84         .mmap           = pxa2xx_pcm_mmap,
  85 };
  86
  87 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  88
  89 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
  90 {
  91         struct snd_card *card = rtd->card->snd_card;
  92         struct snd_pcm *pcm = rtd->pcm;
  93         int ret = 0;
  94
  95         if (!card->dev->dma_mask)
  96                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  97         if (!card->dev->coherent_dma_mask)
  98                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  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 static struct platform_driver pxa_pcm_driver = {
 135         .driver = {
 136                         .name = "pxa-pcm-audio",
 137                         .owner = THIS_MODULE,
 138         },
 139
 140         .probe = pxa2xx_soc_platform_probe,
 141         .remove = pxa2xx_soc_platform_remove,
 142 };
 143
 144 module_platform_driver(pxa_pcm_driver);
 145
 146 MODULE_AUTHOR("Nicolas Pitre");
 147 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 148 MODULE_LICENSE("GPL");