1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com 4 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> 5 */ 6 7 #include <linux/device.h> 8 #include <linux/module.h> 9 #include <sound/core.h> 10 #include <sound/pcm.h> 11 #include <sound/pcm_params.h> 12 #include <sound/soc.h> 13 #include <sound/dmaengine_pcm.h> 14 #include <linux/omap-dmaengine.h> 15 16 #include "sdma-pcm.h" 17 18 static const struct snd_pcm_hardware sdma_pcm_hardware = { 19 .info = SNDRV_PCM_INFO_MMAP | 20 SNDRV_PCM_INFO_MMAP_VALID | 21 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | 22 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP | 23 SNDRV_PCM_INFO_INTERLEAVED, 24 .period_bytes_min = 32, 25 .period_bytes_max = 64 * 1024, 26 .buffer_bytes_max = 128 * 1024, 27 .periods_min = 2, 28 .periods_max = 255, 29 }; 30 31 static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = { 32 .pcm_hardware = &sdma_pcm_hardware, 33 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, 34 .compat_filter_fn = omap_dma_filter_fn, 35 .prealloc_buffer_size = 128 * 1024, 36 }; 37 38 int sdma_pcm_platform_register(struct device *dev, 39 char *txdmachan, char *rxdmachan) 40 { 41 struct snd_dmaengine_pcm_config *config; 42 unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT; 43 44 /* Standard names for the directions: 'tx' and 'rx' */ 45 if (!txdmachan && !rxdmachan) 46 return devm_snd_dmaengine_pcm_register(dev, 47 &sdma_dmaengine_pcm_config, 48 flags); 49 50 config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL); 51 if (!config) 52 return -ENOMEM; 53 54 *config = sdma_dmaengine_pcm_config; 55 56 if (!txdmachan || !rxdmachan) { 57 /* One direction only PCM */ 58 flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX; 59 if (!txdmachan) { 60 txdmachan = rxdmachan; 61 rxdmachan = NULL; 62 } 63 } 64 65 config->chan_names[0] = txdmachan; 66 config->chan_names[1] = rxdmachan; 67 68 return devm_snd_dmaengine_pcm_register(dev, config, flags); 69 } 70 EXPORT_SYMBOL_GPL(sdma_pcm_platform_register); 71 72 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); 73 MODULE_DESCRIPTION("sDMA PCM ASoC platform driver"); 74 MODULE_LICENSE("GPL v2"); 75