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
18 #include <sound/core.h>
19 #include <sound/pcm.h>
20 #include <sound/soc.h>
21 #include <sound/dmaengine_pcm.h>
22
23 #include "imx-pcm.h"
24
filter(struct dma_chan * chan,void * param)25 static bool filter(struct dma_chan *chan, void *param)
26 {
27 struct snd_dmaengine_dai_dma_data *dma_data = param;
28
29 if (!imx_dma_is_general_purpose(chan))
30 return false;
31
32 chan->private = dma_data->filter_data;
33
34 return true;
35 }
36
37 static const struct snd_pcm_hardware imx_pcm_hardware = {
38 .info = SNDRV_PCM_INFO_INTERLEAVED |
39 SNDRV_PCM_INFO_BLOCK_TRANSFER |
40 SNDRV_PCM_INFO_MMAP |
41 SNDRV_PCM_INFO_MMAP_VALID |
42 SNDRV_PCM_INFO_PAUSE |
43 SNDRV_PCM_INFO_RESUME,
44 .formats = SNDRV_PCM_FMTBIT_S16_LE,
45 .rate_min = 8000,
46 .channels_min = 2,
47 .channels_max = 2,
48 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
49 .period_bytes_min = 128,
50 .period_bytes_max = 65535, /* Limited by SDMA engine */
51 .periods_min = 2,
52 .periods_max = 255,
53 .fifo_size = 0,
54 };
55
56 static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
57 .pcm_hardware = &imx_pcm_hardware,
58 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
59 .compat_filter_fn = filter,
60 .prealloc_buffer_size = IMX_SSI_DMABUF_SIZE,
61 };
62
imx_pcm_dma_init(struct platform_device * pdev)63 int imx_pcm_dma_init(struct platform_device *pdev)
64 {
65 return snd_dmaengine_pcm_register(&pdev->dev, &imx_dmaengine_pcm_config,
66 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
67 SND_DMAENGINE_PCM_FLAG_NO_DT |
68 SND_DMAENGINE_PCM_FLAG_COMPAT);
69 }
70
imx_pcm_dma_exit(struct platform_device * pdev)71 void imx_pcm_dma_exit(struct platform_device *pdev)
72 {
73 snd_dmaengine_pcm_unregister(&pdev->dev);
74 }
75