1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx 4 * 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.c 10 */ 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 21 static 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 34 static 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 40 int edma_pcm_platform_register(struct device *dev) 41 { 42 return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config, 0); 43 } 44 EXPORT_SYMBOL_GPL(edma_pcm_platform_register); 45 46 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); 47 MODULE_DESCRIPTION("eDMA PCM ASoC platform driver"); 48 MODULE_LICENSE("GPL"); 49