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#include <linux/dmaengine.h>
  16#include <linux/of.h>
  17
  18#include <sound/core.h>
  19#include <sound/soc.h>
  20#include <sound/pxa2xx-lib.h>
  21#include <sound/dmaengine_pcm.h>
  22
  23#include "../../arm/pxa2xx-pcm.h"
  24
  25static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  26        struct snd_pcm_hw_params *params)
  27{
  28        struct snd_pcm_runtime *runtime = substream->runtime;
  29        struct pxa2xx_runtime_data *prtd = runtime->private_data;
  30        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  31        struct snd_dmaengine_dai_dma_data *dma;
  32        int ret;
  33
  34        dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  35
  36        /* return if this is a bufferless transfer e.g.
  37         * codec <--> BT codec or GSM modem -- lg FIXME */
  38        if (!dma)
  39                return 0;
  40
  41        /* this may get called several times by oss emulation
  42         * with different params */
  43        if (prtd->params == NULL) {
  44                prtd->params = dma;
  45                ret = pxa_request_dma("name", DMA_PRIO_LOW,
  46                              pxa2xx_pcm_dma_irq, substream);
  47                if (ret < 0)
  48                        return ret;
  49                prtd->dma_ch = ret;
  50        } else if (prtd->params != dma) {
  51                pxa_free_dma(prtd->dma_ch);
  52                prtd->params = dma;
  53                ret = pxa_request_dma("name", DMA_PRIO_LOW,
  54                              pxa2xx_pcm_dma_irq, substream);
  55                if (ret < 0)
  56                        return ret;
  57                prtd->dma_ch = ret;
  58        }
  59
  60        return __pxa2xx_pcm_hw_params(substream, params);
  61}
  62
  63static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  64{
  65        struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  66
  67        __pxa2xx_pcm_hw_free(substream);
  68
  69        if (prtd->dma_ch >= 0) {
  70                pxa_free_dma(prtd->dma_ch);
  71                prtd->dma_ch = -1;
  72                prtd->params = NULL;
  73        }
  74
  75        return 0;
  76}
  77
  78static struct snd_pcm_ops pxa2xx_pcm_ops = {
  79        .open           = __pxa2xx_pcm_open,
  80        .close          = __pxa2xx_pcm_close,
  81        .ioctl          = snd_pcm_lib_ioctl,
  82        .hw_params      = pxa2xx_pcm_hw_params,
  83        .hw_free        = pxa2xx_pcm_hw_free,
  84        .prepare        = __pxa2xx_pcm_prepare,
  85        .trigger        = pxa2xx_pcm_trigger,
  86        .pointer        = pxa2xx_pcm_pointer,
  87        .mmap           = pxa2xx_pcm_mmap,
  88};
  89
  90static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
  91{
  92        struct snd_card *card = rtd->card->snd_card;
  93        struct snd_pcm *pcm = rtd->pcm;
  94        int ret;
  95
  96        ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
  97        if (ret)
  98                return ret;
  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
 134#ifdef CONFIG_OF
 135static const struct of_device_id snd_soc_pxa_audio_match[] = {
 136        { .compatible   = "mrvl,pxa-pcm-audio" },
 137        { }
 138};
 139#endif
 140
 141static struct platform_driver pxa_pcm_driver = {
 142        .driver = {
 143                .name = "pxa-pcm-audio",
 144                .owner = THIS_MODULE,
 145                .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
 146        },
 147
 148        .probe = pxa2xx_soc_platform_probe,
 149        .remove = pxa2xx_soc_platform_remove,
 150};
 151
 152module_platform_driver(pxa_pcm_driver);
 153
 154MODULE_AUTHOR("Nicolas Pitre");
 155MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 156MODULE_LICENSE("GPL");
 157