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path: root/sound/soc/fsl/imx-pcm-fiq.c
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Diffstat (limited to 'sound/soc/fsl/imx-pcm-fiq.c')
-rw-r--r--sound/soc/fsl/imx-pcm-fiq.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/sound/soc/fsl/imx-pcm-fiq.c b/sound/soc/fsl/imx-pcm-fiq.c
index 670b96b0ce2f..310d90290320 100644
--- a/sound/soc/fsl/imx-pcm-fiq.c
+++ b/sound/soc/fsl/imx-pcm-fiq.c
@@ -225,6 +225,22 @@ static int snd_imx_close(struct snd_pcm_substream *substream)
return 0;
}
+static 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;
+}
+
static struct snd_pcm_ops imx_pcm_ops = {
.open = snd_imx_open,
.close = snd_imx_close,
@@ -236,6 +252,54 @@ static struct snd_pcm_ops imx_pcm_ops = {
.mmap = 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);
+
+static 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;
+}
+
static int ssi_irq = 0;
static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
@@ -268,6 +332,27 @@ static int imx_pcm_fiq_new(struct snd_soc_pcm_runtime *rtd)
return 0;
}
+static 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;
+ }
+}
+
static void imx_pcm_fiq_free(struct snd_pcm *pcm)
{
mxc_set_irq_fiq(ssi_irq, 0);
@@ -314,3 +399,10 @@ failed_register:
return ret;
}
+EXPORT_SYMBOL_GPL(imx_pcm_fiq_init);
+
+void imx_pcm_fiq_exit(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+}
+EXPORT_SYMBOL_GPL(imx_pcm_fiq_exit);