d65a14587a
Use snd_dmaengine_dai_dma_data for passing the dma parameters from clients to the pxa pcm lib. This does no functional change, it's just an intermedia step to migrate the pxa bits over to dmaengine. The calculation of dcmd is a transition hack which will be removed again in a later patch. It's just there to make the transition more readable. Signed-off-by: Daniel Mack <zonque@gmail.com> Acked-by: Mark Brown <broonie@linaro.org> Signed-off-by: Mark Brown <broonie@linaro.org>
150 lines
3.7 KiB
C
150 lines
3.7 KiB
C
/*
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* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/dmaengine.h>
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#include <sound/core.h>
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#include <sound/soc.h>
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#include <sound/pxa2xx-lib.h>
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#include <sound/dmaengine_pcm.h>
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#include "../../arm/pxa2xx-pcm.h"
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static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pxa2xx_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_dmaengine_dai_dma_data *dma;
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int ret;
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dma = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!dma)
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return 0;
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/* this may get called several times by oss emulation
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* with different params */
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if (prtd->params == NULL) {
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prtd->params = dma;
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ret = pxa_request_dma("name", DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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return ret;
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prtd->dma_ch = ret;
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} else if (prtd->params != dma) {
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pxa_free_dma(prtd->dma_ch);
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prtd->params = dma;
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ret = pxa_request_dma("name", DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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return ret;
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prtd->dma_ch = ret;
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}
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return __pxa2xx_pcm_hw_params(substream, params);
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}
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static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
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__pxa2xx_pcm_hw_free(substream);
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if (prtd->dma_ch >= 0) {
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pxa_free_dma(prtd->dma_ch);
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prtd->dma_ch = -1;
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prtd->params = NULL;
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}
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return 0;
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}
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static struct snd_pcm_ops pxa2xx_pcm_ops = {
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.open = __pxa2xx_pcm_open,
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.close = __pxa2xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pxa2xx_pcm_hw_params,
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.hw_free = pxa2xx_pcm_hw_free,
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.prepare = __pxa2xx_pcm_prepare,
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.trigger = pxa2xx_pcm_trigger,
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.pointer = pxa2xx_pcm_pointer,
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.mmap = pxa2xx_pcm_mmap,
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};
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static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
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static int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &pxa2xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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static struct snd_soc_platform_driver pxa2xx_soc_platform = {
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.ops = &pxa2xx_pcm_ops,
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.pcm_new = pxa2xx_soc_pcm_new,
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.pcm_free = pxa2xx_pcm_free_dma_buffers,
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};
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static int pxa2xx_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform);
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}
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static int pxa2xx_soc_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver pxa_pcm_driver = {
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.driver = {
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.name = "pxa-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = pxa2xx_soc_platform_probe,
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.remove = pxa2xx_soc_platform_remove,
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};
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module_platform_driver(pxa_pcm_driver);
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MODULE_AUTHOR("Nicolas Pitre");
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MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
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MODULE_LICENSE("GPL");
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