mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-16 15:45:45 +00:00
dde637f2da
With the generic dmaengine_pcm support the omap-cpm can be replaced with a much smaller wrapper. CPU DAI drivers can use the: int sdma_pcm_platform_register(struct device *dev, char *txdmachan, char *rxdmachan); To register the platform driver, txdmachan/rxdmachan is only needed to be provided if the DMA channel names are not standard tx/rx, like in case of McPDM, or the DAI is only capable of one audio direction (DMIC, HDMI). This patch only introduces the source file and changes to the Kconfig/Makefile, but does not change any of the DAI drivers to use it. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com> Signed-off-by: Mark Brown <broonie@kernel.org>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
|
|
* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
|
|
*/
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
#include <linux/omap-dma.h>
|
|
|
|
#include "sdma-pcm.h"
|
|
|
|
static const struct snd_pcm_hardware sdma_pcm_hardware = {
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
|
|
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
|
|
SNDRV_PCM_INFO_INTERLEAVED,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 64 * 1024,
|
|
.buffer_bytes_max = 128 * 1024,
|
|
.periods_min = 2,
|
|
.periods_max = 255,
|
|
};
|
|
|
|
static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
|
|
.pcm_hardware = &sdma_pcm_hardware,
|
|
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
|
|
.compat_filter_fn = omap_dma_filter_fn,
|
|
.prealloc_buffer_size = 128 * 1024,
|
|
};
|
|
|
|
int sdma_pcm_platform_register(struct device *dev,
|
|
char *txdmachan, char *rxdmachan)
|
|
{
|
|
struct snd_dmaengine_pcm_config *config;
|
|
unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT;
|
|
|
|
/* Standard names for the directions: 'tx' and 'rx' */
|
|
if (!txdmachan && !rxdmachan)
|
|
return devm_snd_dmaengine_pcm_register(dev,
|
|
&sdma_dmaengine_pcm_config,
|
|
flags);
|
|
|
|
config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
|
|
if (!config)
|
|
return -ENOMEM;
|
|
|
|
*config = sdma_dmaengine_pcm_config;
|
|
|
|
if (!txdmachan || !rxdmachan) {
|
|
/* One direction only PCM */
|
|
flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
|
|
if (!txdmachan) {
|
|
txdmachan = rxdmachan;
|
|
rxdmachan = NULL;
|
|
}
|
|
}
|
|
|
|
config->chan_names[0] = txdmachan;
|
|
config->chan_names[1] = rxdmachan;
|
|
|
|
return devm_snd_dmaengine_pcm_register(dev, config, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
|