122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
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* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
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*
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* Copyright (C) 2005 SAN People
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* Copyright (C) 2008 Atmel
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*
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* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
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*
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* Based on at91-pcm. by:
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* Frank Mandarino <fmandarino@endrelia.com>
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* Copyright 2006 Endrelia Technologies Inc.
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*
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* Based on pxa2xx-pcm.c by:
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <sound/pcm.h>
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#include <sound/soc.h>
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#include "atmel-pcm.h"
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static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
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int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = ATMEL_SSC_DMABUF_SIZE;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_coherent(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n",
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(void *)buf->area, (void *)(long)buf->addr, size);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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int atmel_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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return remap_pfn_range(vma, vma->vm_start,
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substream->dma_buffer.addr >> PAGE_SHIFT,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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}
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EXPORT_SYMBOL_GPL(atmel_pcm_mmap);
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int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
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ret = atmel_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
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ret = atmel_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(atmel_pcm_new);
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void atmel_pcm_free(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_coherent(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(atmel_pcm_free);
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