diff options
Diffstat (limited to 'sound/soc/pxa/pxa2xx-pcm.c')
| -rw-r--r-- | sound/soc/pxa/pxa2xx-pcm.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/sound/soc/pxa/pxa2xx-pcm.c b/sound/soc/pxa/pxa2xx-pcm.c new file mode 100644 index 00000000..fdd6bede --- /dev/null +++ b/sound/soc/pxa/pxa2xx-pcm.c @@ -0,0 +1,148 @@ +/* + * 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 <linux/module.h> + +#include <sound/core.h> +#include <sound/soc.h> +#include <sound/pxa2xx-lib.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->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; + prtd->params = NULL; + } + + 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_soc_pcm_runtime *rtd) +{ + struct snd_card *card = rtd->card->snd_card; + struct snd_pcm *pcm = rtd->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 (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { + ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_PLAYBACK); + if (ret) + goto out; + } + + if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { + ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, + SNDRV_PCM_STREAM_CAPTURE); + if (ret) + goto out; + } + out: + return ret; +} + +static struct snd_soc_platform_driver pxa2xx_soc_platform = { + .ops = &pxa2xx_pcm_ops, + .pcm_new = pxa2xx_soc_pcm_new, + .pcm_free = pxa2xx_pcm_free_dma_buffers, +}; + +static int __devinit pxa2xx_soc_platform_probe(struct platform_device *pdev) +{ + return snd_soc_register_platform(&pdev->dev, &pxa2xx_soc_platform); +} + +static int __devexit pxa2xx_soc_platform_remove(struct platform_device *pdev) +{ + snd_soc_unregister_platform(&pdev->dev); + return 0; +} + +static struct platform_driver pxa_pcm_driver = { + .driver = { + .name = "pxa-pcm-audio", + .owner = THIS_MODULE, + }, + + .probe = pxa2xx_soc_platform_probe, + .remove = __devexit_p(pxa2xx_soc_platform_remove), +}; + +module_platform_driver(pxa_pcm_driver); + +MODULE_AUTHOR("Nicolas Pitre"); +MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); +MODULE_LICENSE("GPL"); |