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
  15#include <sound/core.h>
  16#include <sound/soc.h>
  17#include <sound/pxa2xx-lib.h>
  18
  19#include "../../arm/pxa2xx-pcm.h"
  20
  21static 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
  59static 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
  73static 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
  85static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  86
  87static 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
 114static 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
 120static int __devinit pxa2xx_soc_platform_probe(struct platform_device *pdev)
 121{
 122        return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
 123}
 124
 125static int __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev)
 126{
 127        snd_soc_unregister_platform(&pdev->dev);
 128        return 0;
 129}
 130
 131static 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
 141static int __init snd_pxa_pcm_init(void)
 142{
 143        return platform_driver_register(&pxa_pcm_driver);
 144}
 145module_init(snd_pxa_pcm_init);
 146
 147static void __exit snd_pxa_pcm_exit(void)
 148{
 149        platform_driver_unregister(&pxa_pcm_driver);
 150}
 151module_exit(snd_pxa_pcm_exit);
 152
 153MODULE_AUTHOR("Nicolas Pitre");
 154MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 155MODULE_LICENSE("GPL");
 156