/* * 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 * * 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. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #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 <linux/edma.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, .compat_filter_fn = edma_filter_fn, .prealloc_buffer_size = 128 * 1024, }; int edma_pcm_platform_register(struct device *dev) { return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config, SND_DMAENGINE_PCM_FLAG_COMPAT); } 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");