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 "../../arm/pxa2xx-pcm.h"
  20
  21 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  22         struct snd_pcm_hw_params *params)
  23 {
  24         struct snd_pcm_runtime *runtime = substream->runtime;
  25         struct pxa2xx_runtime_data *prtd = runtime->private_data;
  26         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  27         struct pxa2xx_pcm_dma_params *dma;
  28         int ret;
  29
  30         dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  31
  32         /* return if this is a bufferless transfer e.g.
  33          * codec <--> BT codec or GSM modem -- lg FIXME */
  34         if (!dma)
  35                 return 0;
  36
  37         /* this may get called several times by oss emulation
  38          * with different params */
  39         if (prtd->params == NULL) {
  40                 prtd->params = dma;
  41                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  42                               pxa2xx_pcm_dma_irq, substream);
  43                 if (ret < 0)
  44                         return ret;
  45                 prtd->dma_ch = ret;
  46         } else if (prtd->params != dma) {
  47                 pxa_free_dma(prtd->dma_ch);
  48                 prtd->params = dma;
  49                 ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  50                               pxa2xx_pcm_dma_irq, substream);
  51                 if (ret < 0)
  52                         return ret;
  53                 prtd->dma_ch = ret;
  54         }
  55
  56         return __pxa2xx_pcm_hw_params(substream, params);
  57 }
  58
  59 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  60 {
  61         struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  62
  63         __pxa2xx_pcm_hw_free(substream);
  64
  65         if (prtd->dma_ch >= 0) {
  66                 pxa_free_dma(prtd->dma_ch);
  67                 prtd->dma_ch = -1;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  74         .open           = __pxa2xx_pcm_open,
  75         .close          = __pxa2xx_pcm_close,
  76         .ioctl          = snd_pcm_lib_ioctl,
  77         .hw_params      = pxa2xx_pcm_hw_params,
  78         .hw_free        = pxa2xx_pcm_hw_free,
  79         .prepare        = __pxa2xx_pcm_prepare,
  80         .trigger        = pxa2xx_pcm_trigger,
  81         .pointer        = pxa2xx_pcm_pointer,
  82         .mmap           = pxa2xx_pcm_mmap,
  83 };
  84
  85 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  86
  87 static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
  88         struct snd_pcm *pcm)
  89 {
  90         int ret = 0;
  91
  92         if (!card->dev->dma_mask)
  93                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  94         if (!card->dev->coherent_dma_mask)
  95                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  96
  97         if (dai->driver->playback.channels_min) {
  98                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
  99                         SNDRV_PCM_STREAM_PLAYBACK);
 100                 if (ret)
 101                         goto out;
 102         }
 103
 104         if (dai->driver->capture.channels_min) {
 105                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 106                         SNDRV_PCM_STREAM_CAPTURE);
 107                 if (ret)
 108                         goto out;
 109         }
 110  out:
 111         return ret;
 112 }
 113
 114 static struct snd_soc_platform_driver pxa2xx_soc_platform = {
 115         .ops    = &pxa2xx_pcm_ops,
 116         .pcm_new        = pxa2xx_soc_pcm_new,
 117         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 118 };
 119
 120 static int __devinit pxa2xx_soc_platform_probe(struct platform_device *pdev)
 121 {
 122         return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
 123 }
 124
 125 static int __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev)
 126 {
 127         snd_soc_unregister_platform(&pdev->dev);
 128         return 0;
 129 }
 130
 131 static struct platform_driver pxa_pcm_driver = {
 132         .driver = {
 133                         .name = "pxa-pcm-audio",
 134                         .owner = THIS_MODULE,
 135         },
 136
 137         .probe = pxa2xx_soc_platform_probe,
 138         .remove = __devexit_p(pxa2xx_soc_platform_remove),
 139 };
 140
 141 static int __init snd_pxa_pcm_init(void)
 142 {
 143         return platform_driver_register(&pxa_pcm_driver);
 144 }
 145 module_init(snd_pxa_pcm_init);
 146
 147 static void __exit snd_pxa_pcm_exit(void)
 148 {
 149         platform_driver_unregister(&pxa_pcm_driver);
 150 }
 151 module_exit(snd_pxa_pcm_exit);
 152
 153 MODULE_AUTHOR("Nicolas Pitre");
 154 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 155 MODULE_LICENSE("GPL");