From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 03:02:30 +0200
Subject: Adding upstream version 4.19.249.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/clk/mediatek/reset.c | 97 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 drivers/clk/mediatek/reset.c

(limited to 'drivers/clk/mediatek/reset.c')

diff --git a/drivers/clk/mediatek/reset.c b/drivers/clk/mediatek/reset.c
new file mode 100644
index 000000000..d3551d5ef
--- /dev/null
+++ b/drivers/clk/mediatek/reset.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ *
+ * 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/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+
+#include "clk-mtk.h"
+
+struct mtk_reset {
+	struct regmap *regmap;
+	int regofs;
+	struct reset_controller_dev rcdev;
+};
+
+static int mtk_reset_assert(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
+
+	return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
+			BIT(id % 32), ~0);
+}
+
+static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
+
+	return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
+			BIT(id % 32), 0);
+}
+
+static int mtk_reset(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	int ret;
+
+	ret = mtk_reset_assert(rcdev, id);
+	if (ret)
+		return ret;
+
+	return mtk_reset_deassert(rcdev, id);
+}
+
+static const struct reset_control_ops mtk_reset_ops = {
+	.assert = mtk_reset_assert,
+	.deassert = mtk_reset_deassert,
+	.reset = mtk_reset,
+};
+
+void mtk_register_reset_controller(struct device_node *np,
+			unsigned int num_regs, int regofs)
+{
+	struct mtk_reset *data;
+	int ret;
+	struct regmap *regmap;
+
+	regmap = syscon_node_to_regmap(np);
+	if (IS_ERR(regmap)) {
+		pr_err("Cannot find regmap for %pOF: %ld\n", np,
+				PTR_ERR(regmap));
+		return;
+	}
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return;
+
+	data->regmap = regmap;
+	data->regofs = regofs;
+	data->rcdev.owner = THIS_MODULE;
+	data->rcdev.nr_resets = num_regs * 32;
+	data->rcdev.ops = &mtk_reset_ops;
+	data->rcdev.of_node = np;
+
+	ret = reset_controller_register(&data->rcdev);
+	if (ret) {
+		pr_err("could not register reset controller: %d\n", ret);
+		kfree(data);
+		return;
+	}
+}
-- 
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