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
filter(struct dma_chan * chan,void * param)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_pcm_hardware imx_pcm_hardware = {
37 .info = SNDRV_PCM_INFO_INTERLEAVED |
38 SNDRV_PCM_INFO_BLOCK_TRANSFER |
39 SNDRV_PCM_INFO_MMAP |
40 SNDRV_PCM_INFO_MMAP_VALID |
41 SNDRV_PCM_INFO_PAUSE |
42 SNDRV_PCM_INFO_RESUME,
43 .buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE,
44 .period_bytes_min = 128,
45 .period_bytes_max = 65535, /* Limited by SDMA engine */
46 .periods_min = 2,
47 .periods_max = 255,
48 .fifo_size = 0,
49 };
50
51 static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
52 .pcm_hardware = &imx_pcm_hardware,
53 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
54 .compat_filter_fn = filter,
55 .prealloc_buffer_size = IMX_DEFAULT_DMABUF_SIZE,
56 };
57
imx_pcm_dma_init(struct platform_device * pdev,size_t size)58 int imx_pcm_dma_init(struct platform_device *pdev, size_t size)
59 {
60 struct snd_dmaengine_pcm_config *config;
61 struct snd_pcm_hardware *pcm_hardware;
62
63 config = devm_kzalloc(&pdev->dev,
64 sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
65 if (!config)
66 return -ENOMEM;
67 *config = imx_dmaengine_pcm_config;
68 if (size)
69 config->prealloc_buffer_size = size;
70
71 pcm_hardware = devm_kzalloc(&pdev->dev,
72 sizeof(struct snd_pcm_hardware), GFP_KERNEL);
73 *pcm_hardware = imx_pcm_hardware;
74 if (size)
75 pcm_hardware->buffer_bytes_max = size;
76
77 config->pcm_hardware = pcm_hardware;
78
79 return devm_snd_dmaengine_pcm_register(&pdev->dev,
80 config,
81 SND_DMAENGINE_PCM_FLAG_COMPAT);
82 }
83 EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
84
85 MODULE_LICENSE("GPL");
86