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 "pxa2xx-pcm.h"
  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 = rtd->dai->cpu_dai->dma_data;
  29        int ret;
  30
  31        /* return if this is a bufferless transfer e.g.
  32         * codec <--> BT codec or GSM modem -- lg FIXME */
  33        if (!dma)
  34                return 0;
  35
  36        /* this may get called several times by oss emulation
  37         * with different params */
  38        if (prtd->params == NULL) {
  39                prtd->params = dma;
  40                ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  41                              pxa2xx_pcm_dma_irq, substream);
  42                if (ret < 0)
  43                        return ret;
  44                prtd->dma_ch = ret;
  45        } else if (prtd->params != dma) {
  46                pxa_free_dma(prtd->dma_ch);
  47                prtd->params = dma;
  48                ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
  49                              pxa2xx_pcm_dma_irq, substream);
  50                if (ret < 0)
  51                        return ret;
  52                prtd->dma_ch = ret;
  53        }
  54
  55        return __pxa2xx_pcm_hw_params(substream, params);
  56}
  57
  58static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
  59{
  60        struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
  61
  62        __pxa2xx_pcm_hw_free(substream);
  63
  64        if (prtd->dma_ch >= 0) {
  65                pxa_free_dma(prtd->dma_ch);
  66                prtd->dma_ch = -1;
  67        }
  68
  69        return 0;
  70}
  71
  72static struct snd_pcm_ops pxa2xx_pcm_ops = {
  73        .open           = __pxa2xx_pcm_open,
  74        .close          = __pxa2xx_pcm_close,
  75        .ioctl          = snd_pcm_lib_ioctl,
  76        .hw_params      = pxa2xx_pcm_hw_params,
  77        .hw_free        = pxa2xx_pcm_hw_free,
  78        .prepare        = __pxa2xx_pcm_prepare,
  79        .trigger        = pxa2xx_pcm_trigger,
  80        .pointer        = pxa2xx_pcm_pointer,
  81        .mmap           = pxa2xx_pcm_mmap,
  82};
  83
  84static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
  85
  86static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
  87        struct snd_pcm *pcm)
  88{
  89        int ret = 0;
  90
  91        if (!card->dev->dma_mask)
  92                card->dev->dma_mask = &pxa2xx_pcm_dmamask;
  93        if (!card->dev->coherent_dma_mask)
  94                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  95
  96        if (dai->playback.channels_min) {
  97                ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
  98                        SNDRV_PCM_STREAM_PLAYBACK);
  99                if (ret)
 100                        goto out;
 101        }
 102
 103        if (dai->capture.channels_min) {
 104                ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
 105                        SNDRV_PCM_STREAM_CAPTURE);
 106                if (ret)
 107                        goto out;
 108        }
 109 out:
 110        return ret;
 111}
 112
 113struct snd_soc_platform pxa2xx_soc_platform = {
 114        .name           = "pxa2xx-audio",
 115        .pcm_ops        = &pxa2xx_pcm_ops,
 116        .pcm_new        = pxa2xx_soc_pcm_new,
 117        .pcm_free       = pxa2xx_pcm_free_dma_buffers,
 118};
 119EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
 120
 121static int __init pxa2xx_soc_platform_init(void)
 122{
 123        return snd_soc_register_platform(&pxa2xx_soc_platform);
 124}
 125module_init(pxa2xx_soc_platform_init);
 126
 127static void __exit pxa2xx_soc_platform_exit(void)
 128{
 129        snd_soc_unregister_platform(&pxa2xx_soc_platform);
 130}
 131module_exit(pxa2xx_soc_platform_exit);
 132
 133MODULE_AUTHOR("Nicolas Pitre");
 134MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 135MODULE_LICENSE("GPL");
 136