release/src-rt-6.x.4708/linux/linux-2.6.36/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
  15 #include <sound/core.h>
  16 #include <sound/soc.h>
  17 #include <sound/pxa2xx-lib.h>
  18
  19 #include "pxa2xx-pcm.h"
  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->dai->cpu_dai, substream);
  32
  33         if (!dma)
  34                 return 0;
  35
  36         /* this may get called several times by oss emulation
  37          * with different params */
  38         if (prtd->params == NULL) {
  39                 prtd->params = dma;
  40                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  41                               pxa2xx_pcm_dma_irq, substream);
  42                 if (ret < 0)
  43                         return ret;
  44                 prtd->dma_ch = ret;
  45         } else if (prtd->params != dma) {
  46                 pxa_free_dma(prtd->dma_ch);
  47                 prtd->params = dma;
  48                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  49                               pxa2xx_pcm_dma_irq, substream);
  50                 if (ret < 0)
  51                         return ret;
  52                 prtd->dma_ch = ret;
  53         }
  54
  55         return __pxa2xx_pcm_hw_params(substream, params);
  56 }
  57
  58 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  59 {
  60         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  61
  62         __pxa2xx_pcm_hw_free(substream);
  63
  64         if (prtd->dma_ch >= 0) {
  65                 pxa_free_dma(prtd->dma_ch);
  66                 prtd->dma_ch = -1;
  67         }
  68
  69         return 0;
  70 }
  71
  72 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  73         .open           = __pxa2xx_pcm_open,
  74         .close          = __pxa2xx_pcm_close,
  75         .ioctl          = snd_pcm_lib_ioctl,
  76         .hw_params      = pxa2xx_pcm_hw_params,
  77         .hw_free        = pxa2xx_pcm_hw_free,
  78         .prepare        = __pxa2xx_pcm_prepare,
  79         .trigger        = pxa2xx_pcm_trigger,
  80         .pointer        = pxa2xx_pcm_pointer,
  81         .mmap           = pxa2xx_pcm_mmap,
  82 };
  83
  84 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  85
  86 static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
  87         struct snd_pcm *pcm)
  88 {
  89         int ret = 0;
  90
  91         if (!card->dev->dma_mask)
  92                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  93         if (!card->dev->coherent_dma_mask)
  94                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  95
  96         if (dai->playback.channels_min) {
  97                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
  98                         SNDRV_PCM_STREAM_PLAYBACK);
  99                 if (ret)
 100                         goto out;
 101         }
 102
 103         if (dai->capture.channels_min) {
 104                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 105                         SNDRV_PCM_STREAM_CAPTURE);
 106                 if (ret)
 107                         goto out;
 108         }
 109  out:
 110         return ret;
 111 }
 112
 113 struct snd_soc_platform pxa2xx_soc_platform = {
 114         .name           = "pxa2xx-audio",
 115         .pcm_ops        = &pxa2xx_pcm_ops,
 116         .pcm_new        = pxa2xx_soc_pcm_new,
 117         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 118 };
 119 EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
 120
 121 static int __init pxa2xx_soc_platform_init(void)
 122 {
 123         return snd_soc_register_platform(&pxa2xx_soc_platform);
 124 }
 125 module_init(pxa2xx_soc_platform_init);
 126
 127 static void __exit pxa2xx_soc_platform_exit(void)
 128 {
 129         snd_soc_unregister_platform(&pxa2xx_soc_platform);
 130 }
 131 module_exit(pxa2xx_soc_platform_exit);
 132
 133 MODULE_AUTHOR("Nicolas Pitre");
 134 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 135 MODULE_LICENSE("GPL");