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Linux/sound/soc/fsl/imx-pcm-dma.c

  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_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         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 44         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
 45         .period_bytes_min = 128,
 46         .period_bytes_max = 65535, /* Limited by SDMA engine */
 47         .periods_min = 2,
 48         .periods_max = 255,
 49         .fifo_size = 0,
 50 };
 51 
 52 static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
 53         .pcm_hardware = &imx_pcm_hardware,
 54         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
 55         .compat_filter_fn = filter,
 56         .prealloc_buffer_size = IMX_SSI_DMABUF_SIZE,
 57 };
 58 
 59 int imx_pcm_dma_init(struct platform_device *pdev)
 60 {
 61         return devm_snd_dmaengine_pcm_register(&pdev->dev,
 62                 &imx_dmaengine_pcm_config,
 63                 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
 64                 SND_DMAENGINE_PCM_FLAG_COMPAT);
 65 }
 66 EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
 67 
 68 MODULE_LICENSE("GPL");
 69 

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