Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / soc / fsl / imx-pcm-dma.c

diff --git a/kernel/sound/soc/fsl/imx-pcm-dma.c b/kernel/sound/soc/fsl/imx-pcm-dma.c
new file mode 100644 (file)
index 0000000..0db94f4
--- /dev/null
+++ b/kernel/sound/soc/fsl/imx-pcm-dma.c
@@ -0,0 +1,66 @@
+/*
+ * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
+ *
+ * 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/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/types.h>
+#include <linux/module.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "imx-pcm.h"
+
+static bool filter(struct dma_chan *chan, void *param)
+{
+       if (!imx_dma_is_general_purpose(chan))
+               return false;
+
+       chan->private = param;
+
+       return true;
+}
+
+static const struct snd_pcm_hardware imx_pcm_hardware = {
+       .info = SNDRV_PCM_INFO_INTERLEAVED |
+               SNDRV_PCM_INFO_BLOCK_TRANSFER |
+               SNDRV_PCM_INFO_MMAP |
+               SNDRV_PCM_INFO_MMAP_VALID |
+               SNDRV_PCM_INFO_PAUSE |
+               SNDRV_PCM_INFO_RESUME,
+       .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
+       .period_bytes_min = 128,
+       .period_bytes_max = 65535, /* Limited by SDMA engine */
+       .periods_min = 2,
+       .periods_max = 255,
+       .fifo_size = 0,
+};
+
+static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
+       .pcm_hardware = &imx_pcm_hardware,
+       .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+       .compat_filter_fn = filter,
+       .prealloc_buffer_size = IMX_SSI_DMABUF_SIZE,
+};
+
+int imx_pcm_dma_init(struct platform_device *pdev)
+{
+       return devm_snd_dmaengine_pcm_register(&pdev->dev,
+               &imx_dmaengine_pcm_config,
+               SND_DMAENGINE_PCM_FLAG_COMPAT);
+}
+EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
+
+MODULE_LICENSE("GPL");