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
  17 #include <sound/core.h>
  18 #include <sound/soc.h>
  19 #include <sound/pxa2xx-lib.h>
  20 #include <sound/dmaengine_pcm.h>
  21
  22 #include "../../arm/pxa2xx-pcm.h"
  23
  24 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  25         struct snd_pcm_hw_params *params)
  26 {
  27         struct snd_pcm_runtime *runtime = substream->runtime;
  28         struct pxa2xx_runtime_data *prtd = runtime->private_data;
  29         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  30         struct snd_dmaengine_dai_dma_data *dma;
  31         int ret;
  32
  33         dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  34
  35         /* return if this is a bufferless transfer e.g.
  36          * codec <--> BT codec or GSM modem -- lg FIXME */
  37         if (!dma)
  38                 return 0;
  39
  40         /* this may get called several times by oss emulation
  41          * with different params */
  42         if (prtd->params == NULL) {
  43                 prtd->params = dma;
  44                 ret = pxa_request_dma("name", DMA_PRIO_LOW,
  45                               pxa2xx_pcm_dma_irq, substream);
  46                 if (ret < 0)
  47                         return ret;
  48                 prtd->dma_ch = ret;
  49         } else if (prtd->params != dma) {
  50                 pxa_free_dma(prtd->dma_ch);
  51                 prtd->params = dma;
  52                 ret = pxa_request_dma("name", DMA_PRIO_LOW,
  53                               pxa2xx_pcm_dma_irq, substream);
  54                 if (ret < 0)
  55                         return ret;
  56                 prtd->dma_ch = ret;
  57         }
  58
  59         return __pxa2xx_pcm_hw_params(substream, params);
  60 }
  61
  62 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  63 {
  64         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  65
  66         __pxa2xx_pcm_hw_free(substream);
  67
  68         if (prtd->dma_ch >= 0) {
  69                 pxa_free_dma(prtd->dma_ch);
  70                 prtd->dma_ch = -1;
  71                 prtd->params = NULL;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  78         .open           = __pxa2xx_pcm_open,
  79         .close          = __pxa2xx_pcm_close,
  80         .ioctl          = snd_pcm_lib_ioctl,
  81         .hw_params      = pxa2xx_pcm_hw_params,
  82         .hw_free        = pxa2xx_pcm_hw_free,
  83         .prepare        = __pxa2xx_pcm_prepare,
  84         .trigger        = pxa2xx_pcm_trigger,
  85         .pointer        = pxa2xx_pcm_pointer,
  86         .mmap           = pxa2xx_pcm_mmap,
  87 };
  88
  89 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  90
  91 static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
  92 {
  93         struct snd_card *card = rtd->card->snd_card;
  94         struct snd_pcm *pcm = rtd->pcm;
  95         int ret = 0;
  96
  97         if (!card->dev->dma_mask)
  98                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  99         if (!card->dev->coherent_dma_mask)
 100                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 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 static struct platform_driver pxa_pcm_driver = {
 137         .driver = {
 138                         .name = "pxa-pcm-audio",
 139                         .owner = THIS_MODULE,
 140         },
 141
 142         .probe = pxa2xx_soc_platform_probe,
 143         .remove = pxa2xx_soc_platform_remove,
 144 };
 145
 146 module_platform_driver(pxa_pcm_driver);
 147
 148 MODULE_AUTHOR("Nicolas Pitre");
 149 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 150 MODULE_LICENSE("GPL");