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 <mach/dma.h>
  19
  20#include <sound/core.h>
  21#include <sound/soc.h>
  22#include <sound/pxa2xx-lib.h>
  23#include <sound/dmaengine_pcm.h>
  24
  25#include "../../arm/pxa2xx-pcm.h"
  26
  27static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
  28        struct snd_pcm_hw_params *params)
  29{
  30        struct snd_pcm_runtime *runtime = substream->runtime;
  31        struct pxa2xx_runtime_data *prtd = runtime->private_data;
  32        struct snd_soc_pcm_runtime *rtd = substream->private_data;
  33        struct snd_dmaengine_dai_dma_data *dma;
  34        int ret;
  35
  36        dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
  37
  38        /* return if this is a bufferless transfer e.g.
  39         * codec <--> BT codec or GSM modem -- lg FIXME */
  40        if (!dma)
  41                return 0;
  42
  43        /* this may get called several times by oss emulation
  44         * with different params */
  45        if (prtd->params == NULL) {
  46                prtd->params = dma;
  47                ret = pxa_request_dma("name", DMA_PRIO_LOW,
  48                              pxa2xx_pcm_dma_irq, substream);
  49                if (ret < 0)
  50                        return ret;
  51                prtd->dma_ch = ret;
  52        } else if (prtd->params != dma) {
  53                pxa_free_dma(prtd->dma_ch);
  54                prtd->params = dma;
  55                ret = pxa_request_dma("name", DMA_PRIO_LOW,
  56                              pxa2xx_pcm_dma_irq, substream);
  57                if (ret < 0)
  58                        return ret;
  59                prtd->dma_ch = ret;
  60        }
  61
  62        return __pxa2xx_pcm_hw_params(substream, params);
  63}
  64
  65static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  66{
  67        struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  68
  69        __pxa2xx_pcm_hw_free(substream);
  70
  71        if (prtd->dma_ch >= 0) {
  72                pxa_free_dma(prtd->dma_ch);
  73                prtd->dma_ch = -1;
  74                prtd->params = NULL;
  75        }
  76
  77        return 0;
  78}
  79
  80static struct snd_pcm_ops pxa2xx_pcm_ops = {
  81        .open           = __pxa2xx_pcm_open,
  82        .close          = __pxa2xx_pcm_close,
  83        .ioctl          = snd_pcm_lib_ioctl,
  84        .hw_params      = pxa2xx_pcm_hw_params,
  85        .hw_free        = pxa2xx_pcm_hw_free,
  86        .prepare        = __pxa2xx_pcm_prepare,
  87        .trigger        = pxa2xx_pcm_trigger,
  88        .pointer        = pxa2xx_pcm_pointer,
  89        .mmap           = pxa2xx_pcm_mmap,
  90};
  91
  92static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
  93{
  94        struct snd_card *card = rtd->card->snd_card;
  95        struct snd_pcm *pcm = rtd->pcm;
  96        int ret;
  97
  98        ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
  99        if (ret)
 100                return ret;
 101
 102        if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 103                ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 104                        SNDRV_PCM_STREAM_PLAYBACK);
 105                if (ret)
 106                        goto out;
 107        }
 108
 109        if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 110                ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 111                        SNDRV_PCM_STREAM_CAPTURE);
 112                if (ret)
 113                        goto out;
 114        }
 115 out:
 116        return ret;
 117}
 118
 119static struct snd_soc_platform_driver pxa2xx_soc_platform = {
 120        .ops    = &pxa2xx_pcm_ops,
 121        .pcm_new        = pxa2xx_soc_pcm_new,
 122        .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 123};
 124
 125static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
 126{
 127        return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
 128}
 129
 130static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
 131{
 132        snd_soc_unregister_platform(&pdev->dev);
 133        return 0;
 134}
 135
 136#ifdef CONFIG_OF
 137static const struct of_device_id snd_soc_pxa_audio_match[] = {
 138        { .compatible   = "mrvl,pxa-pcm-audio" },
 139        { }
 140};
 141#endif
 142
 143static struct platform_driver pxa_pcm_driver = {
 144        .driver = {
 145                .name = "pxa-pcm-audio",
 146                .owner = THIS_MODULE,
 147                .of_match_table = of_match_ptr(snd_soc_pxa_audio_match),
 148        },
 149
 150        .probe = pxa2xx_soc_platform_probe,
 151        .remove = pxa2xx_soc_platform_remove,
 152};
 153
 154module_platform_driver(pxa_pcm_driver);
 155
 156MODULE_AUTHOR("Nicolas Pitre");
 157MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 158MODULE_LICENSE("GPL");
 159