1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/clk/actions/owl-reset.c b/drivers/clk/actions/owl-reset.c
new file mode 100644
index 0000000000..203f8f34a8
--- /dev/null
+++ b/drivers/clk/actions/owl-reset.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// Actions Semi Owl SoCs Reset Management Unit driver
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+#include "owl-reset.h"
+
+static int owl_reset_assert(struct reset_controller_dev *rcdev,
+			    unsigned long id)
+{
+	struct owl_reset *reset = to_owl_reset(rcdev);
+	const struct owl_reset_map *map = &reset->reset_map[id];
+
+	return regmap_update_bits(reset->regmap, map->reg, map->bit, 0);
+}
+
+static int owl_reset_deassert(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct owl_reset *reset = to_owl_reset(rcdev);
+	const struct owl_reset_map *map = &reset->reset_map[id];
+
+	return regmap_update_bits(reset->regmap, map->reg, map->bit, map->bit);
+}
+
+static int owl_reset_reset(struct reset_controller_dev *rcdev,
+			   unsigned long id)
+{
+	owl_reset_assert(rcdev, id);
+	udelay(1);
+	owl_reset_deassert(rcdev, id);
+
+	return 0;
+}
+
+static int owl_reset_status(struct reset_controller_dev *rcdev,
+			    unsigned long id)
+{
+	struct owl_reset *reset = to_owl_reset(rcdev);
+	const struct owl_reset_map *map = &reset->reset_map[id];
+	u32 reg;
+	int ret;
+
+	ret = regmap_read(reset->regmap, map->reg, &reg);
+	if (ret)
+		return ret;
+
+	/*
+	 * The reset control API expects 0 if reset is not asserted,
+	 * which is the opposite of what our hardware uses.
+	 */
+	return !(map->bit & reg);
+}
+
+const struct reset_control_ops owl_reset_ops = {
+	.assert		= owl_reset_assert,
+	.deassert	= owl_reset_deassert,
+	.reset		= owl_reset_reset,
+	.status		= owl_reset_status,
+};