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
22static 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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
32static 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
37int 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}
51EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
52
53MODULE_DESCRIPTION("Freescale i.MX PCM DMA interface");
54MODULE_LICENSE("GPL");

 
 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
26static 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
36static 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
51static 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
58int 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}
83EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
84
 
85MODULE_LICENSE("GPL");