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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx4 *5 * Copyright (C) 2014 Texas Instruments, Inc.6 *7 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>8 *9 * Based on: sound/soc/tegra/tegra_pcm.c10 */11 12#include <linux/module.h>13#include <sound/core.h>14#include <sound/pcm.h>15#include <sound/pcm_params.h>16#include <sound/soc.h>17#include <sound/dmaengine_pcm.h>18 19#include "edma-pcm.h"20 21static const struct snd_pcm_hardware edma_pcm_hardware = {22 .info = SNDRV_PCM_INFO_MMAP |23 SNDRV_PCM_INFO_MMAP_VALID |24 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |25 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |26 SNDRV_PCM_INFO_INTERLEAVED,27 .buffer_bytes_max = 128 * 1024,28 .period_bytes_min = 32,29 .period_bytes_max = 64 * 1024,30 .periods_min = 2,31 .periods_max = 19, /* Limit by edma dmaengine driver */32};33 34static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {35 .pcm_hardware = &edma_pcm_hardware,36 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,37 .prealloc_buffer_size = 128 * 1024,38};39 40int edma_pcm_platform_register(struct device *dev)41{42 struct snd_dmaengine_pcm_config *config;43 44 if (dev->of_node)45 return devm_snd_dmaengine_pcm_register(dev,46 &edma_dmaengine_pcm_config, 0);47 48 config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);49 if (!config)50 return -ENOMEM;51 52 *config = edma_dmaengine_pcm_config;53 54 config->chan_names[0] = "tx";55 config->chan_names[1] = "rx";56 57 return devm_snd_dmaengine_pcm_register(dev, config, 0);58}59EXPORT_SYMBOL_GPL(edma_pcm_platform_register);60 61MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");62MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");63MODULE_LICENSE("GPL");64