clk: sunxi-ng: Add common infrastructure

Start our new clock infrastructure by adding the registration code, common
structure and common code.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20160629190535.11855-3-maxime.ripard@free-electrons.com

drivers/clk/sunxi-ng/ccu_reset.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Maxime Ripard
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * 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/io.h>
+#include <linux/reset-controller.h>
+
+#include "ccu_reset.h"
+
+static int ccu_reset_assert(struct reset_controller_dev *rcdev,
+			    unsigned long id)
+{
+	struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
+	const struct ccu_reset_map *map = &ccu->reset_map[id];
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(ccu->lock, flags);
+
+	reg = readl(ccu->base + map->reg);
+	writel(reg & ~map->bit, ccu->base + map->reg);
+
+	spin_unlock_irqrestore(ccu->lock, flags);
+
+	return 0;
+}
+
+static int ccu_reset_deassert(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev);
+	const struct ccu_reset_map *map = &ccu->reset_map[id];
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(ccu->lock, flags);
+
+	reg = readl(ccu->base + map->reg);
+	writel(reg | map->bit, ccu->base + map->reg);
+
+	spin_unlock_irqrestore(ccu->lock, flags);
+
+	return 0;
+}
+
+const struct reset_control_ops ccu_reset_ops = {
+	.assert		= ccu_reset_assert,
+	.deassert	= ccu_reset_deassert,
+};