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@@ -0,0 +1,105 @@
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+/*
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+ * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
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+ *
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+ * This code is based on code copyrighted by Freescale,
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+ * Liam Girdwood, Javier Martin and probably others.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ */
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+
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+#include <linux/dma-mapping.h>
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+#include <linux/module.h>
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+#include <sound/pcm.h>
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+#include <sound/soc.h>
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+#include "imx-pcm.h"
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+
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+int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
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+ struct vm_area_struct *vma)
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+{
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+ struct snd_pcm_runtime *runtime = substream->runtime;
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+ int ret;
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+
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+ ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
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+ runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
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+
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+ pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
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+ runtime->dma_area,
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+ runtime->dma_addr,
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+ runtime->dma_bytes);
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+ return ret;
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+}
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+EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
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+
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+static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, 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 = IMX_SSI_DMABUF_SIZE;
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+
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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_writecombine(pcm->card->dev, size,
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+ &buf->addr, GFP_KERNEL);
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+ if (!buf->area)
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+ return -ENOMEM;
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+ buf->bytes = size;
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+
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+ return 0;
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+}
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+
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+static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
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+
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+int imx_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 = 0;
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+
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+ if (!card->dev->dma_mask)
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+ card->dev->dma_mask = &imx_pcm_dmamask;
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+ if (!card->dev->coherent_dma_mask)
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+ card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
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+ if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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+ ret = imx_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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+
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+ if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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+ ret = imx_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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+
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+out:
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+ return ret;
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+}
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+EXPORT_SYMBOL_GPL(imx_pcm_new);
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+
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+void imx_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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+
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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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+
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+ buf = &substream->dma_buffer;
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+ if (!buf->area)
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+ continue;
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+
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+ dma_free_writecombine(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(imx_pcm_free);
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Shawn Guo