summaryrefslogtreecommitdiffstats
path: root/drivers/clk/mediatek/clk-gate.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/mediatek/clk-gate.c')
-rw-r--r--drivers/clk/mediatek/clk-gate.c285
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");