1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer 4 * 5 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> 6 * 7 * This code is based on code copyrighted by Freescale, 8 * Liam Girdwood, Javier Martin and probably others. 9 */ 10 #include <linux/platform_device.h> 11 #include <linux/dmaengine.h> 12 #include <linux/types.h> 13 #include <linux/module.h> 14 15 #include <sound/core.h> 16 #include <sound/pcm.h> 17 #include <sound/soc.h> 18 #include <sound/dmaengine_pcm.h> 19 20 #include "imx-pcm.h" 21 22 static bool filter(struct dma_chan *chan, void *param) 23 { 24 if (!imx_dma_is_general_purpose(chan)) 25 return false; 26 27 chan->private = param; 28 29 return true; 30 } 31 32 static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = { 33 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, 34 .compat_filter_fn = filter, 35 }; 36 37 int imx_pcm_dma_init(struct platform_device *pdev) 38 { 39 struct snd_dmaengine_pcm_config *config; 40 41 config = devm_kzalloc(&pdev->dev, 42 sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL); 43 if (!config) 44 return -ENOMEM; 45 *config = imx_dmaengine_pcm_config; 46 47 return devm_snd_dmaengine_pcm_register(&pdev->dev, 48 config, 49 SND_DMAENGINE_PCM_FLAG_COMPAT); 50 } 51 EXPORT_SYMBOL_GPL(imx_pcm_dma_init); 52 53 MODULE_DESCRIPTION("Freescale i.MX PCM DMA interface"); 54 MODULE_LICENSE("GPL"); 55