ASoC: samsung: Use ASoC dmaengine code where possible

Since all Exynos platforms have been converted to dmaengine and many of
the older platforms are in the process of conversion they do not need to
use the legacy s3c-dma APIs for DMA but can instead use the standard ASoC
dmaengine helpers. This both allows them to benefit from improvements
implemented in the generic code and supports multiplatform.

This patch includes some fixes from Padma for Exynos SoCs, her testing
was on a slightly earlier version of the patch due to unrelated breakage
preventing testing.

Signed-off-by: Mark Brown <broonie@linaro.org>
Tested By: Padmavathi Venna <padma.v@samsung.com>

1 files changed, 84 insertions, 0 deletions

diff --git a/sound/soc/samsung/dmaengine.c b/sound/soc/samsung/dmaengine.c
new file mode 100644
index 000000000000..3be479d51b9b
--- /dev/null
+++ b/sound/soc/samsung/dmaengine.c
@@ -0,0 +1,84 @@
+/*
+ * dmaengine.c - Samsung dmaengine wrapper
+ *
+ * Author: Mark Brown <broonie@linaro.org>
+ * Copyright 2013 Linaro
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/amba/pl08x.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "dma.h"
+
+#ifdef CONFIG_ARCH_S3C64XX
+#define filter_fn pl08x_filter_id
+#else
+#define filter_fn NULL
+#endif
+
+static const struct snd_dmaengine_pcm_config samsung_dmaengine_pcm_config = {
+	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+	.compat_filter_fn = filter_fn,
+};
+
+void samsung_asoc_init_dma_data(struct snd_soc_dai *dai,
+				struct s3c_dma_params *playback,
+				struct s3c_dma_params *capture)
+{
+	struct snd_dmaengine_dai_dma_data *playback_data = NULL;
+	struct snd_dmaengine_dai_dma_data *capture_data = NULL;
+
+	if (playback) {
+		playback_data = &playback->dma_data;
+		playback_data->filter_data = (void *)playback->channel;
+		playback_data->chan_name = playback->ch_name;
+		playback_data->addr = playback->dma_addr;
+		playback_data->addr_width = playback->dma_size;
+	}
+	if (capture) {
+		capture_data = &capture->dma_data;
+		capture_data->filter_data = (void *)capture->channel;
+		capture_data->chan_name = capture->ch_name;
+		capture_data->addr = capture->dma_addr;
+		capture_data->addr_width = capture->dma_size;
+	}
+
+	snd_soc_dai_init_dma_data(dai, playback_data, capture_data);
+}
+EXPORT_SYMBOL_GPL(samsung_asoc_init_dma_data);
+
+int samsung_asoc_dma_platform_register(struct device *dev)
+{
+	return snd_dmaengine_pcm_register(dev, &samsung_dmaengine_pcm_config,
+					  SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME |
+					  SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
+					  SND_DMAENGINE_PCM_FLAG_COMPAT);
+}
+EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_register);
+
+void samsung_asoc_dma_platform_unregister(struct device *dev)
+{
+	return snd_dmaengine_pcm_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(samsung_asoc_dma_platform_unregister);
+
+MODULE_AUTHOR("Mark Brown <broonie@linaro.org>");
+MODULE_DESCRIPTION("Samsung dmaengine ASoC driver");
+MODULE_LICENSE("GPL");