sound/soc/imx/imx-pcm.c

   1 /*
   2  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   3  *
   4  * This code is based on code copyrighted by Freescale,
   5  * Liam Girdwood, Javier Martin and probably others.
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/dma-mapping.h>
  14 #include <linux/module.h>
  15 #include <sound/pcm.h>
  16 #include <sound/soc.h>
  17 #include "imx-pcm.h"
  18
  19 int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
  20                 struct vm_area_struct *vma)
  21 {
  22         struct snd_pcm_runtime *runtime = substream->runtime;
  23         int ret;
  24
  25         ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
  26                 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
  27
  28         pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
  29                         runtime->dma_area,
  30                         runtime->dma_addr,
  31                         runtime->dma_bytes);
  32         return ret;
  33 }
  34 EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
  35
  36 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
  37 {
  38         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
  39         struct snd_dma_buffer *buf = &substream->dma_buffer;
  40         size_t size = IMX_SSI_DMABUF_SIZE;
  41
  42         buf->dev.type = SNDRV_DMA_TYPE_DEV;
  43         buf->dev.dev = pcm->card->dev;
  44         buf->private_data = NULL;
  45         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
  46                                            &buf->addr, GFP_KERNEL);
  47         if (!buf->area)
  48                 return -ENOMEM;
  49         buf->bytes = size;
  50
  51         return 0;
  52 }
  53
  54 static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
  55
  56 int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
  57 {
  58         struct snd_card *card = rtd->card->snd_card;
  59         struct snd_pcm *pcm = rtd->pcm;
  60         int ret = 0;
  61
  62         if (!card->dev->dma_mask)
  63                 card->dev->dma_mask = &imx_pcm_dmamask;
  64         if (!card->dev->coherent_dma_mask)
  65                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  66         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
  67                 ret = imx_pcm_preallocate_dma_buffer(pcm,
  68                         SNDRV_PCM_STREAM_PLAYBACK);
  69                 if (ret)
  70                         goto out;
  71         }
  72
  73         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
  74                 ret = imx_pcm_preallocate_dma_buffer(pcm,
  75                         SNDRV_PCM_STREAM_CAPTURE);
  76                 if (ret)
  77                         goto out;
  78         }
  79
  80 out:
  81         return ret;
  82 }
  83 EXPORT_SYMBOL_GPL(imx_pcm_new);
  84
  85 void imx_pcm_free(struct snd_pcm *pcm)
  86 {
  87         struct snd_pcm_substream *substream;
  88         struct snd_dma_buffer *buf;
  89         int stream;
  90
  91         for (stream = 0; stream < 2; stream++) {
  92                 substream = pcm->streams[stream].substream;
  93                 if (!substream)
  94                         continue;
  95
  96                 buf = &substream->dma_buffer;
  97                 if (!buf->area)
  98                         continue;
  99
 100                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 101                                       buf->area, buf->addr);
 102                 buf->area = NULL;
 103         }
 104 }
 105 EXPORT_SYMBOL_GPL(imx_pcm_free);