soc/ti/edma-pcm.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
0004  *
0005  * Copyright (C) 2014 Texas Instruments, Inc.
0006  *
0007  * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
0008  *
0009  * Based on: sound/soc/tegra/tegra_pcm.c
0010  */
0011
0012 #include <linux/module.h>
0013 #include <sound/core.h>
0014 #include <sound/pcm.h>
0015 #include <sound/pcm_params.h>
0016 #include <sound/soc.h>
0017 #include <sound/dmaengine_pcm.h>
0018
0019 #include "edma-pcm.h"
0020
0021 static const struct snd_pcm_hardware edma_pcm_hardware = {
0022     .info           = SNDRV_PCM_INFO_MMAP |
0023                   SNDRV_PCM_INFO_MMAP_VALID |
0024                   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
0025                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
0026                   SNDRV_PCM_INFO_INTERLEAVED,
0027     .buffer_bytes_max   = 128 * 1024,
0028     .period_bytes_min   = 32,
0029     .period_bytes_max   = 64 * 1024,
0030     .periods_min        = 2,
0031     .periods_max        = 19, /* Limit by edma dmaengine driver */
0032 };
0033
0034 static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
0035     .pcm_hardware = &edma_pcm_hardware,
0036     .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
0037     .prealloc_buffer_size = 128 * 1024,
0038 };
0039
0040 int edma_pcm_platform_register(struct device *dev)
0041 {
0042     struct snd_dmaengine_pcm_config *config;
0043
0044     if (dev->of_node)
0045         return devm_snd_dmaengine_pcm_register(dev,
0046                         &edma_dmaengine_pcm_config, 0);
0047
0048     config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
0049     if (!config)
0050         return -ENOMEM;
0051
0052     *config = edma_dmaengine_pcm_config;
0053
0054     config->chan_names[0] = "tx";
0055     config->chan_names[1] = "rx";
0056
0057     return devm_snd_dmaengine_pcm_register(dev, config, 0);
0058 }
0059 EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
0060
0061 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
0062 MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
0063 MODULE_LICENSE("GPL");