162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com 462306a36Sopenharmony_ci * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> 562306a36Sopenharmony_ci */ 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci#include <linux/device.h> 862306a36Sopenharmony_ci#include <linux/module.h> 962306a36Sopenharmony_ci#include <sound/core.h> 1062306a36Sopenharmony_ci#include <sound/pcm.h> 1162306a36Sopenharmony_ci#include <sound/pcm_params.h> 1262306a36Sopenharmony_ci#include <sound/soc.h> 1362306a36Sopenharmony_ci#include <sound/dmaengine_pcm.h> 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_ci#include "sdma-pcm.h" 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_cistatic const struct snd_pcm_hardware sdma_pcm_hardware = { 1862306a36Sopenharmony_ci .info = SNDRV_PCM_INFO_MMAP | 1962306a36Sopenharmony_ci SNDRV_PCM_INFO_MMAP_VALID | 2062306a36Sopenharmony_ci SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | 2162306a36Sopenharmony_ci SNDRV_PCM_INFO_NO_PERIOD_WAKEUP | 2262306a36Sopenharmony_ci SNDRV_PCM_INFO_INTERLEAVED, 2362306a36Sopenharmony_ci .period_bytes_min = 32, 2462306a36Sopenharmony_ci .period_bytes_max = 64 * 1024, 2562306a36Sopenharmony_ci .buffer_bytes_max = 128 * 1024, 2662306a36Sopenharmony_ci .periods_min = 2, 2762306a36Sopenharmony_ci .periods_max = 255, 2862306a36Sopenharmony_ci}; 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_cistatic const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = { 3162306a36Sopenharmony_ci .pcm_hardware = &sdma_pcm_hardware, 3262306a36Sopenharmony_ci .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, 3362306a36Sopenharmony_ci .prealloc_buffer_size = 128 * 1024, 3462306a36Sopenharmony_ci}; 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ciint sdma_pcm_platform_register(struct device *dev, 3762306a36Sopenharmony_ci char *txdmachan, char *rxdmachan) 3862306a36Sopenharmony_ci{ 3962306a36Sopenharmony_ci struct snd_dmaengine_pcm_config *config; 4062306a36Sopenharmony_ci unsigned int flags = 0; 4162306a36Sopenharmony_ci 4262306a36Sopenharmony_ci /* Standard names for the directions: 'tx' and 'rx' */ 4362306a36Sopenharmony_ci if (!txdmachan && !rxdmachan) 4462306a36Sopenharmony_ci return devm_snd_dmaengine_pcm_register(dev, 4562306a36Sopenharmony_ci &sdma_dmaengine_pcm_config, 0); 4662306a36Sopenharmony_ci 4762306a36Sopenharmony_ci config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL); 4862306a36Sopenharmony_ci if (!config) 4962306a36Sopenharmony_ci return -ENOMEM; 5062306a36Sopenharmony_ci 5162306a36Sopenharmony_ci *config = sdma_dmaengine_pcm_config; 5262306a36Sopenharmony_ci 5362306a36Sopenharmony_ci if (!txdmachan || !rxdmachan) { 5462306a36Sopenharmony_ci /* One direction only PCM */ 5562306a36Sopenharmony_ci flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX; 5662306a36Sopenharmony_ci if (!txdmachan) { 5762306a36Sopenharmony_ci txdmachan = rxdmachan; 5862306a36Sopenharmony_ci rxdmachan = NULL; 5962306a36Sopenharmony_ci } 6062306a36Sopenharmony_ci } 6162306a36Sopenharmony_ci 6262306a36Sopenharmony_ci config->chan_names[0] = txdmachan; 6362306a36Sopenharmony_ci config->chan_names[1] = rxdmachan; 6462306a36Sopenharmony_ci 6562306a36Sopenharmony_ci return devm_snd_dmaengine_pcm_register(dev, config, flags); 6662306a36Sopenharmony_ci} 6762306a36Sopenharmony_ciEXPORT_SYMBOL_GPL(sdma_pcm_platform_register); 6862306a36Sopenharmony_ci 6962306a36Sopenharmony_ciMODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); 7062306a36Sopenharmony_ciMODULE_DESCRIPTION("sDMA PCM ASoC platform driver"); 7162306a36Sopenharmony_ciMODULE_LICENSE("GPL v2"); 72