kernel/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                 .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
 147         },
 148
 149         .probe = pxa2xx_soc_platform_probe,
 150         .remove = pxa2xx_soc_platform_remove,
 151 };
 152
 153 module_platform_driver(pxa_pcm_driver);
 154
 155 MODULE_AUTHOR("Nicolas Pitre");
 156 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 157 MODULE_LICENSE("GPL");