| 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(dev: &pdev->dev, |
| 42 | size: 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(dev: &pdev->dev, |
| 48 | config, |
| 49 | SND_DMAENGINE_PCM_FLAG_COMPAT); |
| 50 | } |
| 51 | EXPORT_SYMBOL_GPL(imx_pcm_dma_init); |
| 52 | |
| 53 | MODULE_LICENSE("GPL"); |
| 54 |