1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-gate.c b/drivers/clk/mediatek/clk-gate.c
new file mode 100644
index 0000000000..67d9e741c5
--- /dev/null
+++ b/drivers/clk/mediatek/clk-gate.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: James Liao <jamesjj.liao@mediatek.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "clk-gate.h"
+
+struct mtk_clk_gate {
+	struct clk_hw	hw;
+	struct regmap	*regmap;
+	int		set_ofs;
+	int		clr_ofs;
+	int		sta_ofs;
+	u8		bit;
+};
+
+static inline struct mtk_clk_gate *to_mtk_clk_gate(struct clk_hw *hw)
+{
+	return container_of(hw, struct mtk_clk_gate, hw);
+}
+
+static u32 mtk_get_clockgating(struct clk_hw *hw)
+{
+	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
+	u32 val;
+
+	regmap_read(cg->regmap, cg->sta_ofs, &val);
+
+	return val & BIT(cg->bit);
+}
+
+static int mtk_cg_bit_is_cleared(struct clk_hw *hw)
+{
+	return mtk_get_clockgating(hw) == 0;
+}
+
+static int mtk_cg_bit_is_set(struct clk_hw *hw)
+{
+	return mtk_get_clockgating(hw) != 0;
+}
+
+static void mtk_cg_set_bit(struct clk_hw *hw)
+{
+	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
+
+	regmap_write(cg->regmap, cg->set_ofs, BIT(cg->bit));
+}
+
+static void mtk_cg_clr_bit(struct clk_hw *hw)
+{
+	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
+
+	regmap_write(cg->regmap, cg->clr_ofs, BIT(cg->bit));
+}
+
+static void mtk_cg_set_bit_no_setclr(struct clk_hw *hw)
+{
+	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
+
+	regmap_set_bits(cg->regmap, cg->sta_ofs, BIT(cg->bit));
+}
+
+static void mtk_cg_clr_bit_no_setclr(struct clk_hw *hw)
+{
+	struct mtk_clk_gate *cg = to_mtk_clk_gate(hw);
+
+	regmap_clear_bits(cg->regmap, cg->sta_ofs, BIT(cg->bit));
+}
+
+static int mtk_cg_enable(struct clk_hw *hw)
+{
+	mtk_cg_clr_bit(hw);
+
+	return 0;
+}
+
+static void mtk_cg_disable(struct clk_hw *hw)
+{
+	mtk_cg_set_bit(hw);
+}
+
+static int mtk_cg_enable_inv(struct clk_hw *hw)
+{
+	mtk_cg_set_bit(hw);
+
+	return 0;
+}
+
+static void mtk_cg_disable_inv(struct clk_hw *hw)
+{
+	mtk_cg_clr_bit(hw);
+}
+
+static int mtk_cg_enable_no_setclr(struct clk_hw *hw)
+{
+	mtk_cg_clr_bit_no_setclr(hw);
+
+	return 0;
+}
+
+static void mtk_cg_disable_no_setclr(struct clk_hw *hw)
+{
+	mtk_cg_set_bit_no_setclr(hw);
+}
+
+static int mtk_cg_enable_inv_no_setclr(struct clk_hw *hw)
+{
+	mtk_cg_set_bit_no_setclr(hw);
+
+	return 0;
+}
+
+static void mtk_cg_disable_inv_no_setclr(struct clk_hw *hw)
+{
+	mtk_cg_clr_bit_no_setclr(hw);
+}
+
+const struct clk_ops mtk_clk_gate_ops_setclr = {
+	.is_enabled	= mtk_cg_bit_is_cleared,
+	.enable		= mtk_cg_enable,
+	.disable	= mtk_cg_disable,
+};
+EXPORT_SYMBOL_GPL(mtk_clk_gate_ops_setclr);
+
+const struct clk_ops mtk_clk_gate_ops_setclr_inv = {
+	.is_enabled	= mtk_cg_bit_is_set,
+	.enable		= mtk_cg_enable_inv,
+	.disable	= mtk_cg_disable_inv,
+};
+EXPORT_SYMBOL_GPL(mtk_clk_gate_ops_setclr_inv);
+
+const struct clk_ops mtk_clk_gate_ops_no_setclr = {
+	.is_enabled	= mtk_cg_bit_is_cleared,
+	.enable		= mtk_cg_enable_no_setclr,
+	.disable	= mtk_cg_disable_no_setclr,
+};
+EXPORT_SYMBOL_GPL(mtk_clk_gate_ops_no_setclr);
+
+const struct clk_ops mtk_clk_gate_ops_no_setclr_inv = {
+	.is_enabled	= mtk_cg_bit_is_set,
+	.enable		= mtk_cg_enable_inv_no_setclr,
+	.disable	= mtk_cg_disable_inv_no_setclr,
+};
+EXPORT_SYMBOL_GPL(mtk_clk_gate_ops_no_setclr_inv);
+
+static struct clk_hw *mtk_clk_register_gate(struct device *dev, const char *name,
+					 const char *parent_name,
+					 struct regmap *regmap, int set_ofs,
+					 int clr_ofs, int sta_ofs, u8 bit,
+					 const struct clk_ops *ops,
+					 unsigned long flags)
+{
+	struct mtk_clk_gate *cg;
+	int ret;
+	struct clk_init_data init = {};
+
+	cg = kzalloc(sizeof(*cg), GFP_KERNEL);
+	if (!cg)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.flags = flags | CLK_SET_RATE_PARENT;
+	init.parent_names = parent_name ? &parent_name : NULL;
+	init.num_parents = parent_name ? 1 : 0;
+	init.ops = ops;
+
+	cg->regmap = regmap;
+	cg->set_ofs = set_ofs;
+	cg->clr_ofs = clr_ofs;
+	cg->sta_ofs = sta_ofs;
+	cg->bit = bit;
+
+	cg->hw.init = &init;
+
+	ret = clk_hw_register(dev, &cg->hw);
+	if (ret) {
+		kfree(cg);
+		return ERR_PTR(ret);
+	}
+
+	return &cg->hw;
+}
+
+static void mtk_clk_unregister_gate(struct clk_hw *hw)
+{
+	struct mtk_clk_gate *cg;
+	if (!hw)
+		return;
+
+	cg = to_mtk_clk_gate(hw);
+
+	clk_hw_unregister(hw);
+	kfree(cg);
+}
+
+int mtk_clk_register_gates(struct device *dev, struct device_node *node,
+			   const struct mtk_gate *clks, int num,
+			   struct clk_hw_onecell_data *clk_data)
+{
+	int i;
+	struct clk_hw *hw;
+	struct regmap *regmap;
+
+	if (!clk_data)
+		return -ENOMEM;
+
+	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_gate *gate = &clks[i];
+
+		if (!IS_ERR_OR_NULL(clk_data->hws[gate->id])) {
+			pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
+				node, gate->id);
+			continue;
+		}
+
+		hw = mtk_clk_register_gate(dev, gate->name, gate->parent_name,
+					    regmap,
+					    gate->regs->set_ofs,
+					    gate->regs->clr_ofs,
+					    gate->regs->sta_ofs,
+					    gate->shift, gate->ops,
+					    gate->flags);
+
+		if (IS_ERR(hw)) {
+			pr_err("Failed to register clk %s: %pe\n", gate->name,
+			       hw);
+			goto err;
+		}
+
+		clk_data->hws[gate->id] = hw;
+	}
+
+	return 0;
+
+err:
+	while (--i >= 0) {
+		const struct mtk_gate *gate = &clks[i];
+
+		if (IS_ERR_OR_NULL(clk_data->hws[gate->id]))
+			continue;
+
+		mtk_clk_unregister_gate(clk_data->hws[gate->id]);
+		clk_data->hws[gate->id] = ERR_PTR(-ENOENT);
+	}
+
+	return PTR_ERR(hw);
+}
+EXPORT_SYMBOL_GPL(mtk_clk_register_gates);
+
+void mtk_clk_unregister_gates(const struct mtk_gate *clks, int num,
+			      struct clk_hw_onecell_data *clk_data)
+{
+	int i;
+
+	if (!clk_data)
+		return;
+
+	for (i = num; i > 0; i--) {
+		const struct mtk_gate *gate = &clks[i - 1];
+
+		if (IS_ERR_OR_NULL(clk_data->hws[gate->id]))
+			continue;
+
+		mtk_clk_unregister_gate(clk_data->hws[gate->id]);
+		clk_data->hws[gate->id] = ERR_PTR(-ENOENT);
+	}
+}
+EXPORT_SYMBOL_GPL(mtk_clk_unregister_gates);
+
+MODULE_LICENSE("GPL");