1 files changed, 105 insertions, 0 deletions

diff --git a/sound/soc/imx/imx-pcm.c b/sound/soc/imx/imx-pcm.c
new file mode 100644
index 000000000000..93dc360b1777
--- /dev/null
+++ b/sound/soc/imx/imx-pcm.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This code is based on code copyrighted by Freescale,
+ * Liam Girdwood, Javier Martin and probably others.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include "imx-pcm.h"
+
+int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
+                struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int ret;
+
+        ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
+                runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
+
+        pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
+                        runtime->dma_area,
+                        runtime->dma_addr,
+                        runtime->dma_bytes);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
+
+static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+        struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+        struct snd_dma_buffer *buf = &substream->dma_buffer;
+        size_t size = IMX_SSI_DMABUF_SIZE;
+
+        buf->dev.type = SNDRV_DMA_TYPE_DEV;
+        buf->dev.dev = pcm->card->dev;
+        buf->private_data = NULL;
+        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+                                           &buf->addr, GFP_KERNEL);
+        if (!buf->area)
+                return -ENOMEM;
+        buf->bytes = size;
+
+        return 0;
+}
+
+static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
+
+int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+        struct snd_card *card = rtd->card->snd_card;
+        struct snd_pcm *pcm = rtd->pcm;
+        int ret = 0;
+
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &imx_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+        if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+                ret = imx_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_PLAYBACK);
+                if (ret)
+                        goto out;
+        }
+
+        if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+                ret = imx_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_CAPTURE);
+                if (ret)
+                        goto out;
+        }
+
+out:
+        return ret;
+}
+EXPORT_SYMBOL_GPL(imx_pcm_new);
+
+void imx_pcm_free(struct snd_pcm *pcm)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_dma_buffer *buf;
+        int stream;
+
+        for (stream = 0; stream < 2; stream++) {
+                substream = pcm->streams[stream].substream;
+                if (!substream)
+                        continue;
+
+                buf = &substream->dma_buffer;
+                if (!buf->area)
+                        continue;
+
+                dma_free_writecombine(pcm->card->dev, buf->bytes,
+                                      buf->area, buf->addr);
+                buf->area = NULL;
+        }
+}
+EXPORT_SYMBOL_GPL(imx_pcm_free);