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Linux/sound/soc/atmel/atmel-pcm.c

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  1 /*
  2  * atmel-pcm.c  --  ALSA PCM interface for the Atmel atmel SoC.
  3  *
  4  *  Copyright (C) 2005 SAN People
  5  *  Copyright (C) 2008 Atmel
  6  *
  7  * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
  8  *
  9  * Based on at91-pcm. by:
 10  * Frank Mandarino <fmandarino@endrelia.com>
 11  * Copyright 2006 Endrelia Technologies Inc.
 12  *
 13  * Based on pxa2xx-pcm.c by:
 14  *
 15  * Author:      Nicolas Pitre
 16  * Created:     Nov 30, 2004
 17  * Copyright:   (C) 2004 MontaVista Software, Inc.
 18  *
 19  * This program is free software; you can redistribute it and/or modify
 20  * it under the terms of the GNU General Public License as published by
 21  * the Free Software Foundation; either version 2 of the License, or
 22  * (at your option) any later version.
 23  *
 24  * This program is distributed in the hope that it will be useful,
 25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 27  * GNU General Public License for more details.
 28  *
 29  * You should have received a copy of the GNU General Public License
 30  * along with this program; if not, write to the Free Software
 31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 32  */
 33 
 34 #include <linux/module.h>
 35 #include <linux/dma-mapping.h>
 36 #include <sound/pcm.h>
 37 #include <sound/soc.h>
 38 #include "atmel-pcm.h"
 39 
 40 static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 41         int stream)
 42 {
 43         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 44         struct snd_dma_buffer *buf = &substream->dma_buffer;
 45         size_t size = ATMEL_SSC_DMABUF_SIZE;
 46 
 47         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 48         buf->dev.dev = pcm->card->dev;
 49         buf->private_data = NULL;
 50         buf->area = dma_alloc_coherent(pcm->card->dev, size,
 51                         &buf->addr, GFP_KERNEL);
 52         pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n",
 53                         (void *)buf->area, (void *)buf->addr, size);
 54 
 55         if (!buf->area)
 56                 return -ENOMEM;
 57 
 58         buf->bytes = size;
 59         return 0;
 60 }
 61 
 62 int atmel_pcm_mmap(struct snd_pcm_substream *substream,
 63         struct vm_area_struct *vma)
 64 {
 65         return remap_pfn_range(vma, vma->vm_start,
 66                        substream->dma_buffer.addr >> PAGE_SHIFT,
 67                        vma->vm_end - vma->vm_start, vma->vm_page_prot);
 68 }
 69 EXPORT_SYMBOL_GPL(atmel_pcm_mmap);
 70 
 71 static u64 atmel_pcm_dmamask = DMA_BIT_MASK(32);
 72 
 73 int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
 74 {
 75         struct snd_card *card = rtd->card->snd_card;
 76         struct snd_pcm *pcm = rtd->pcm;
 77         int ret = 0;
 78 
 79         if (!card->dev->dma_mask)
 80                 card->dev->dma_mask = &atmel_pcm_dmamask;
 81         if (!card->dev->coherent_dma_mask)
 82                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 83 
 84         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 85                 pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
 86                 ret = atmel_pcm_preallocate_dma_buffer(pcm,
 87                         SNDRV_PCM_STREAM_PLAYBACK);
 88                 if (ret)
 89                         goto out;
 90         }
 91 
 92         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 93                 pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
 94                 ret = atmel_pcm_preallocate_dma_buffer(pcm,
 95                         SNDRV_PCM_STREAM_CAPTURE);
 96                 if (ret)
 97                         goto out;
 98         }
 99  out:
100         return ret;
101 }
102 EXPORT_SYMBOL_GPL(atmel_pcm_new);
103 
104 void atmel_pcm_free(struct snd_pcm *pcm)
105 {
106         struct snd_pcm_substream *substream;
107         struct snd_dma_buffer *buf;
108         int stream;
109 
110         for (stream = 0; stream < 2; stream++) {
111                 substream = pcm->streams[stream].substream;
112                 if (!substream)
113                         continue;
114 
115                 buf = &substream->dma_buffer;
116                 if (!buf->area)
117                         continue;
118                 dma_free_coherent(pcm->card->dev, buf->bytes,
119                                   buf->area, buf->addr);
120                 buf->area = NULL;
121         }
122 }
123 EXPORT_SYMBOL_GPL(atmel_pcm_free);
124 
125 

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