138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
|
|
* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Nov 30, 2004
|
|
* Copyright: (C) 2004 MontaVista Software, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/pxa2xx-lib.h>
|
|
|
|
#include "pxa2xx-pcm.h"
|
|
#include "../../arm/pxa2xx-pcm.h"
|
|
|
|
static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct pxa2xx_runtime_data *prtd = runtime->private_data;
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct pxa2xx_pcm_dma_params *dma;
|
|
int ret;
|
|
|
|
dma = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
|
|
|
|
/* return if this is a bufferless transfer e.g.
|
|
* codec <--> BT codec or GSM modem -- lg FIXME */
|
|
if (!dma)
|
|
return 0;
|
|
|
|
/* this may get called several times by oss emulation
|
|
* with different params */
|
|
if (prtd->params == NULL) {
|
|
prtd->params = dma;
|
|
ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
|
|
pxa2xx_pcm_dma_irq, substream);
|
|
if (ret < 0)
|
|
return ret;
|
|
prtd->dma_ch = ret;
|
|
} else if (prtd->params != dma) {
|
|
pxa_free_dma(prtd->dma_ch);
|
|
prtd->params = dma;
|
|
ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
|
|
pxa2xx_pcm_dma_irq, substream);
|
|
if (ret < 0)
|
|
return ret;
|
|
prtd->dma_ch = ret;
|
|
}
|
|
|
|
return __pxa2xx_pcm_hw_params(substream, params);
|
|
}
|
|
|
|
static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
|
|
|
__pxa2xx_pcm_hw_free(substream);
|
|
|
|
if (prtd->dma_ch >= 0) {
|
|
pxa_free_dma(prtd->dma_ch);
|
|
prtd->dma_ch = -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct snd_pcm_ops pxa2xx_pcm_ops = {
|
|
.open = __pxa2xx_pcm_open,
|
|
.close = __pxa2xx_pcm_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = pxa2xx_pcm_hw_params,
|
|
.hw_free = pxa2xx_pcm_hw_free,
|
|
.prepare = __pxa2xx_pcm_prepare,
|
|
.trigger = pxa2xx_pcm_trigger,
|
|
.pointer = pxa2xx_pcm_pointer,
|
|
.mmap = pxa2xx_pcm_mmap,
|
|
};
|
|
|
|
static u64 pxa2xx_pcm_dmamask = DMA_BIT_MASK(32);
|
|
|
|
static int pxa2xx_soc_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
|
|
struct snd_pcm *pcm)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!card->dev->dma_mask)
|
|
card->dev->dma_mask = &pxa2xx_pcm_dmamask;
|
|
if (!card->dev->coherent_dma_mask)
|
|
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
|
|
|
|
if (dai->playback.channels_min) {
|
|
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (dai->capture.channels_min) {
|
|
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
struct snd_soc_platform pxa2xx_soc_platform = {
|
|
.name = "pxa2xx-audio",
|
|
.pcm_ops = &pxa2xx_pcm_ops,
|
|
.pcm_new = pxa2xx_soc_pcm_new,
|
|
.pcm_free = pxa2xx_pcm_free_dma_buffers,
|
|
};
|
|
EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
|
|
|
|
static int __init pxa2xx_soc_platform_init(void)
|
|
{
|
|
return snd_soc_register_platform(&pxa2xx_soc_platform);
|
|
}
|
|
module_init(pxa2xx_soc_platform_init);
|
|
|
|
static void __exit pxa2xx_soc_platform_exit(void)
|
|
{
|
|
snd_soc_unregister_platform(&pxa2xx_soc_platform);
|
|
}
|
|
module_exit(pxa2xx_soc_platform_exit);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre");
|
|
MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
|
|
MODULE_LICENSE("GPL");
|