| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer |
| 3 | * |
| 4 | * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> |
| 5 | * |
| 6 | * This code is based on code copyrighted by Freescale, |
| 7 | * Liam Girdwood, Javier Martin and probably others. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the |
| 11 | * Free Software Foundation; either version 2 of the License, or (at your |
| 12 | * option) any later version. |
| 13 | */ |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/dmaengine.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/module.h> |
| 18 | |
| 19 | #include <sound/core.h> |
| 20 | #include <sound/pcm.h> |
| 21 | #include <sound/soc.h> |
| 22 | #include <sound/dmaengine_pcm.h> |
| 23 | |
| 24 | #include "imx-pcm.h" |
| 25 | |
| 26 | static bool filter(struct dma_chan *chan, void *param) |
| 27 | { |
| 28 | if (!imx_dma_is_general_purpose(chan)) |
| 29 | return false; |
| 30 | |
| 31 | chan->private = param; |
| 32 | |
| 33 | return true; |
| 34 | } |
| 35 | |
| 36 | static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = { |
| 37 | .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, |
| 38 | .compat_filter_fn = filter, |
| 39 | }; |
| 40 | |
| 41 | int imx_pcm_dma_init(struct platform_device *pdev, size_t size) |
| 42 | { |
| 43 | struct snd_dmaengine_pcm_config *config; |
| 44 | |
| 45 | config = devm_kzalloc(&pdev->dev, |
| 46 | sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL); |
| 47 | if (!config) |
| 48 | return -ENOMEM; |
| 49 | *config = imx_dmaengine_pcm_config; |
| 50 | |
| 51 | return devm_snd_dmaengine_pcm_register(&pdev->dev, |
| 52 | config, |
| 53 | SND_DMAENGINE_PCM_FLAG_COMPAT); |
| 54 | } |
| 55 | EXPORT_SYMBOL_GPL(imx_pcm_dma_init); |
| 56 | |
| 57 | MODULE_LICENSE("GPL"); |