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");