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                 prtd->params = NULL;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static struct snd_pcm_ops pxa2xx_pcm_ops = {
  75         .open           = __pxa2xx_pcm_open,
  76         .close          = __pxa2xx_pcm_close,
  77         .ioctl          = snd_pcm_lib_ioctl,
  78         .hw_params      = pxa2xx_pcm_hw_params,
  79         .hw_free        = pxa2xx_pcm_hw_free,
  80         .prepare        = __pxa2xx_pcm_prepare,
  81         .trigger        = pxa2xx_pcm_trigger,
  82         .pointer        = pxa2xx_pcm_pointer,
  83         .mmap           = pxa2xx_pcm_mmap,
  84 };
  85
  86 static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  87
  88 static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
  89         struct snd_pcm *pcm)
  90 {
  91         int ret = 0;
  92
  93         if (!card->dev->dma_mask)
  94                 card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  95         if (!card->dev->coherent_dma_mask)
  96                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  97
  98         if (dai->driver->playback.channels_min) {
  99                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 100                         SNDRV_PCM_STREAM_PLAYBACK);
 101                 if (ret)
 102                         goto out;
 103         }
 104
 105         if (dai->driver->capture.channels_min) {
 106                 ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 107                         SNDRV_PCM_STREAM_CAPTURE);
 108                 if (ret)
 109                         goto out;
 110         }
 111  out:
 112         return ret;
 113 }
 114
 115 static struct snd_soc_platform_driver pxa2xx_soc_platform = {
 116         .ops    = &pxa2xx_pcm_ops,
 117         .pcm_new        = pxa2xx_soc_pcm_new,
 118         .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 119 };
 120
 121 static int __devinit pxa2xx_soc_platform_probe(struct platform_device *pdev)
 122 {
 123         return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
 124 }
 125
 126 static int __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev)
 127 {
 128         snd_soc_unregister_platform(&pdev->dev);
 129         return 0;
 130 }
 131
 132 static struct platform_driver pxa_pcm_driver = {
 133         .driver = {
 134                         .name = "pxa-pcm-audio",
 135                         .owner = THIS_MODULE,
 136         },
 137
 138         .probe = pxa2xx_soc_platform_probe,
 139         .remove = __devexit_p(pxa2xx_soc_platform_remove),
 140 };
 141
 142 static int __init snd_pxa_pcm_init(void)
 143 {
 144         return platform_driver_register(&pxa_pcm_driver);
 145 }
 146 module_init(snd_pxa_pcm_init);
 147
 148 static void __exit snd_pxa_pcm_exit(void)
 149 {
 150         platform_driver_unregister(&pxa_pcm_driver);
 151 }
 152 module_exit(snd_pxa_pcm_exit);
 153
 154 MODULE_AUTHOR("Nicolas Pitre");
 155 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 156 MODULE_LICENSE("GPL");