LXR linux/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
  16#include <sound/core.h>
  17#include <sound/soc.h>
  18#include <sound/pxa2xx-lib.h>
  19
  20#include "../../arm/pxa2xx-pcm.h"
  21
  22static 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->cpu_dai, substream);
  32
  33        /* return if this is a bufferless transfer e.g.
  34         * codec <--> BT codec or GSM modem -- lg FIXME */
  35        if (!dma)
  36                return 0;
  37
  38        /* this may get called several times by oss emulation
  39         * with different params */
  40        if (prtd->params == NULL) {
  41                prtd->params = dma;
  42                ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  43                              pxa2xx_pcm_dma_irq, substream);
  44                if (ret < 0)
  45                        return ret;
  46                prtd->dma_ch = ret;
  47        } else if (prtd->params != dma) {
  48                pxa_free_dma(prtd->dma_ch);
  49                prtd->params = dma;
  50                ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  51                              pxa2xx_pcm_dma_irq, substream);
  52                if (ret < 0)
  53                        return ret;
  54                prtd->dma_ch = ret;
  55        }
  56
  57        return __pxa2xx_pcm_hw_params(substream, params);
  58}
  59
  60static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  61{
  62        struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  63
  64        __pxa2xx_pcm_hw_free(substream);
  65
  66        if (prtd->dma_ch >= 0) {
  67                pxa_free_dma(prtd->dma_ch);
  68                prtd->dma_ch = -1;
  69                prtd->params = NULL;
  70        }
  71
  72        return 0;
  73}
  74
  75static struct snd_pcm_ops pxa2xx_pcm_ops = {
  76        .open           = __pxa2xx_pcm_open,
  77        .close          = __pxa2xx_pcm_close,
  78        .ioctl          = snd_pcm_lib_ioctl,
  79        .hw_params      = pxa2xx_pcm_hw_params,
  80        .hw_free        = pxa2xx_pcm_hw_free,
  81        .prepare        = __pxa2xx_pcm_prepare,
  82        .trigger        = pxa2xx_pcm_trigger,
  83        .pointer        = pxa2xx_pcm_pointer,
  84        .mmap           = pxa2xx_pcm_mmap,
  85};
  86
  87static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  88
  89static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
  90{
  91        struct snd_card *card = rtd->card->snd_card;
  92        struct snd_pcm *pcm = rtd->pcm;
  93        int ret = 0;
  94
  95        if (!card->dev->dma_mask)
  96                card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  97        if (!card->dev->coherent_dma_mask)
  98                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  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
 117static 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
 123static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
 124{
 125        return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
 126}
 127
 128static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
 129{
 130        snd_soc_unregister_platform(&pdev->dev);
 131        return 0;
 132}
 133
 134static struct platform_driver pxa_pcm_driver = {
 135        .driver = {
 136                        .name = "pxa-pcm-audio",
 137                        .owner = THIS_MODULE,
 138        },
 139
 140        .probe = pxa2xx_soc_platform_probe,
 141        .remove = pxa2xx_soc_platform_remove,
 142};
 143
 144module_platform_driver(pxa_pcm_driver);
 145
 146MODULE_AUTHOR("Nicolas Pitre");
 147MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 148MODULE_LICENSE("GPL");
 149