mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 15:26:21 +09:00
27b7def93a
Most of the daVinci devices does not boot with DT. In this case the DMA channel is looked up with dma_slave_map and for that the chan_names[] must be configured. Both McASP and ASP/McBSP uses "tx" and "rx" as channel names, so we can just do this when the dev->of_node is not valid. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Link: https://lore.kernel.org/r/20190830103841.25128-4-peter.ujfalusi@ti.com Signed-off-by: Mark Brown <broonie@kernel.org>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
|
|
*
|
|
* Copyright (C) 2014 Texas Instruments, Inc.
|
|
*
|
|
* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
|
|
*
|
|
* Based on: sound/soc/tegra/tegra_pcm.c
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
|
|
#include "edma-pcm.h"
|
|
|
|
static const struct snd_pcm_hardware edma_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,
|
|
.buffer_bytes_max = 128 * 1024,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 64 * 1024,
|
|
.periods_min = 2,
|
|
.periods_max = 19, /* Limit by edma dmaengine driver */
|
|
};
|
|
|
|
static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
|
|
.pcm_hardware = &edma_pcm_hardware,
|
|
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
|
|
.prealloc_buffer_size = 128 * 1024,
|
|
};
|
|
|
|
int edma_pcm_platform_register(struct device *dev)
|
|
{
|
|
struct snd_dmaengine_pcm_config *config;
|
|
|
|
if (dev->of_node)
|
|
return devm_snd_dmaengine_pcm_register(dev,
|
|
&edma_dmaengine_pcm_config, 0);
|
|
|
|
config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
|
|
if (!config)
|
|
return -ENOMEM;
|
|
|
|
*config = edma_dmaengine_pcm_config;
|
|
|
|
config->chan_names[0] = "tx";
|
|
config->chan_names[1] = "rx";
|
|
|
|
return devm_snd_dmaengine_pcm_register(dev, config, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
|
|
|
|
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
|
|
MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
|
|
MODULE_LICENSE("GPL");
|