dmaengine: fsl-edma: add ColdFire mcf5441x edma support

This patch adds support for ColdFire mcf5441x-family edma
module.

The ColdFire edma module is slightly different from fsl-edma,
so a new driver is added. But most of the code is common
between fsl-edma and mcf-edma so it has been collected into a
separate common module fsl-edma-common (patch 1/3).

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

include/linux/platform_data/dma-mcf-edma.h

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Freescale eDMA platform data, ColdFire SoC's family.
+ *
+ * Copyright (c) 2017 Angelo Dureghello <angelo@sysam.it>
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_PLATFORM_DATA_MCF_EDMA_H__
+#define __LINUX_PLATFORM_DATA_MCF_EDMA_H__
+
+struct dma_slave_map;
+
+bool mcf_edma_filter_fn(struct dma_chan *chan, void *param);
+
+#define MCF_EDMA_FILTER_PARAM(ch)	((void *)ch)
+
+/**
+ * struct mcf_edma_platform_data - platform specific data for eDMA engine
+ *
+ * @ver			The eDMA module version.
+ * @dma_channels	The number of eDMA channels.
+ */
+struct mcf_edma_platform_data {
+	int dma_channels;
+	const struct dma_slave_map *slave_map;
+	int slavecnt;
+};
+
+#endif /* __LINUX_PLATFORM_DATA_MCF_EDMA_H__ */