From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/clk/mediatek/clk-cpumux.c | 173 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 drivers/clk/mediatek/clk-cpumux.c

(limited to 'drivers/clk/mediatek/clk-cpumux.c')

diff --git a/drivers/clk/mediatek/clk-cpumux.c b/drivers/clk/mediatek/clk-cpumux.c
new file mode 100644
index 0000000000..a03826db4d
--- /dev/null
+++ b/drivers/clk/mediatek/clk-cpumux.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015 Linaro Ltd.
+ * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/container_of.h>
+#include <linux/err.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "clk-mtk.h"
+#include "clk-cpumux.h"
+
+struct mtk_clk_cpumux {
+	struct clk_hw	hw;
+	struct regmap	*regmap;
+	u32		reg;
+	u32		mask;
+	u8		shift;
+};
+
+static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
+{
+	return container_of(_hw, struct mtk_clk_cpumux, hw);
+}
+
+static u8 clk_cpumux_get_parent(struct clk_hw *hw)
+{
+	struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
+	unsigned int val;
+
+	regmap_read(mux->regmap, mux->reg, &val);
+
+	val >>= mux->shift;
+	val &= mux->mask;
+
+	return val;
+}
+
+static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
+{
+	struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
+	u32 mask, val;
+
+	val = index << mux->shift;
+	mask = mux->mask << mux->shift;
+
+	return regmap_update_bits(mux->regmap, mux->reg, mask, val);
+}
+
+static const struct clk_ops clk_cpumux_ops = {
+	.determine_rate = clk_hw_determine_rate_no_reparent,
+	.get_parent = clk_cpumux_get_parent,
+	.set_parent = clk_cpumux_set_parent,
+};
+
+static struct clk_hw *
+mtk_clk_register_cpumux(struct device *dev, const struct mtk_composite *mux,
+			struct regmap *regmap)
+{
+	struct mtk_clk_cpumux *cpumux;
+	int ret;
+	struct clk_init_data init;
+
+	cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL);
+	if (!cpumux)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = mux->name;
+	init.ops = &clk_cpumux_ops;
+	init.parent_names = mux->parent_names;
+	init.num_parents = mux->num_parents;
+	init.flags = mux->flags;
+
+	cpumux->reg = mux->mux_reg;
+	cpumux->shift = mux->mux_shift;
+	cpumux->mask = BIT(mux->mux_width) - 1;
+	cpumux->regmap = regmap;
+	cpumux->hw.init = &init;
+
+	ret = clk_hw_register(dev, &cpumux->hw);
+	if (ret) {
+		kfree(cpumux);
+		return ERR_PTR(ret);
+	}
+
+	return &cpumux->hw;
+}
+
+static void mtk_clk_unregister_cpumux(struct clk_hw *hw)
+{
+	struct mtk_clk_cpumux *cpumux;
+	if (!hw)
+		return;
+
+	cpumux = to_mtk_clk_cpumux(hw);
+
+	clk_hw_unregister(hw);
+	kfree(cpumux);
+}
+
+int mtk_clk_register_cpumuxes(struct device *dev, struct device_node *node,
+			      const struct mtk_composite *clks, int num,
+			      struct clk_hw_onecell_data *clk_data)
+{
+	int i;
+	struct clk_hw *hw;
+	struct regmap *regmap;
+
+	regmap = device_node_to_regmap(node);
+	if (IS_ERR(regmap)) {
+		pr_err("Cannot find regmap for %pOF: %pe\n", node, regmap);
+		return PTR_ERR(regmap);
+	}
+
+	for (i = 0; i < num; i++) {
+		const struct mtk_composite *mux = &clks[i];
+
+		if (!IS_ERR_OR_NULL(clk_data->hws[mux->id])) {
+			pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
+				node, mux->id);
+			continue;
+		}
+
+		hw = mtk_clk_register_cpumux(dev, mux, regmap);
+		if (IS_ERR(hw)) {
+			pr_err("Failed to register clk %s: %pe\n", mux->name,
+			       hw);
+			goto err;
+		}
+
+		clk_data->hws[mux->id] = hw;
+	}
+
+	return 0;
+
+err:
+	while (--i >= 0) {
+		const struct mtk_composite *mux = &clks[i];
+
+		if (IS_ERR_OR_NULL(clk_data->hws[mux->id]))
+			continue;
+
+		mtk_clk_unregister_cpumux(clk_data->hws[mux->id]);
+		clk_data->hws[mux->id] = ERR_PTR(-ENOENT);
+	}
+
+	return PTR_ERR(hw);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_register_cpumuxes);
+
+void mtk_clk_unregister_cpumuxes(const struct mtk_composite *clks, int num,
+				 struct clk_hw_onecell_data *clk_data)
+{
+	int i;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_composite *mux = &clks[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->hws[mux->id]))
+			continue;
+
+		mtk_clk_unregister_cpumux(clk_data->hws[mux->id]);
+		clk_data->hws[mux->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_cpumuxes);
+
+MODULE_LICENSE("GPL");
-- 
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