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-rw-r--r--drivers/clk/mediatek/clk-mux.c223
1 files changed, 223 insertions, 0 deletions
diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c
new file mode 100644
index 000000000..14e127e9a
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mux.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Owen Chen <owen.chen@mediatek.com>
+ */
+
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+#include <linux/mfd/syscon.h>
+
+#include "clk-mtk.h"
+#include "clk-mux.h"
+
+static inline struct mtk_clk_mux *to_mtk_clk_mux(struct clk_hw *hw)
+{
+ return container_of(hw, struct mtk_clk_mux, hw);
+}
+
+static int mtk_clk_mux_enable(struct clk_hw *hw)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+ u32 mask = BIT(mux->data->gate_shift);
+
+ return regmap_update_bits(mux->regmap, mux->data->mux_ofs,
+ mask, ~mask);
+}
+
+static void mtk_clk_mux_disable(struct clk_hw *hw)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+ u32 mask = BIT(mux->data->gate_shift);
+
+ regmap_update_bits(mux->regmap, mux->data->mux_ofs, mask, mask);
+}
+
+static int mtk_clk_mux_enable_setclr(struct clk_hw *hw)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+
+ return regmap_write(mux->regmap, mux->data->clr_ofs,
+ BIT(mux->data->gate_shift));
+}
+
+static void mtk_clk_mux_disable_setclr(struct clk_hw *hw)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+
+ regmap_write(mux->regmap, mux->data->set_ofs,
+ BIT(mux->data->gate_shift));
+}
+
+static int mtk_clk_mux_is_enabled(struct clk_hw *hw)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+ u32 val;
+
+ regmap_read(mux->regmap, mux->data->mux_ofs, &val);
+
+ return (val & BIT(mux->data->gate_shift)) == 0;
+}
+
+static u8 mtk_clk_mux_get_parent(struct clk_hw *hw)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+ u32 mask = GENMASK(mux->data->mux_width - 1, 0);
+ u32 val;
+
+ regmap_read(mux->regmap, mux->data->mux_ofs, &val);
+ val = (val >> mux->data->mux_shift) & mask;
+
+ return val;
+}
+
+static int mtk_clk_mux_set_parent_lock(struct clk_hw *hw, u8 index)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+ u32 mask = GENMASK(mux->data->mux_width - 1, 0);
+ unsigned long flags = 0;
+
+ if (mux->lock)
+ spin_lock_irqsave(mux->lock, flags);
+ else
+ __acquire(mux->lock);
+
+ regmap_update_bits(mux->regmap, mux->data->mux_ofs, mask,
+ index << mux->data->mux_shift);
+
+ if (mux->lock)
+ spin_unlock_irqrestore(mux->lock, flags);
+ else
+ __release(mux->lock);
+
+ return 0;
+}
+
+static int mtk_clk_mux_set_parent_setclr_lock(struct clk_hw *hw, u8 index)
+{
+ struct mtk_clk_mux *mux = to_mtk_clk_mux(hw);
+ u32 mask = GENMASK(mux->data->mux_width - 1, 0);
+ u32 val, orig;
+ unsigned long flags = 0;
+
+ if (mux->lock)
+ spin_lock_irqsave(mux->lock, flags);
+ else
+ __acquire(mux->lock);
+
+ regmap_read(mux->regmap, mux->data->mux_ofs, &orig);
+ val = (orig & ~(mask << mux->data->mux_shift))
+ | (index << mux->data->mux_shift);
+
+ if (val != orig) {
+ regmap_write(mux->regmap, mux->data->clr_ofs,
+ mask << mux->data->mux_shift);
+ regmap_write(mux->regmap, mux->data->set_ofs,
+ index << mux->data->mux_shift);
+
+ if (mux->data->upd_shift >= 0)
+ regmap_write(mux->regmap, mux->data->upd_ofs,
+ BIT(mux->data->upd_shift));
+ }
+
+ if (mux->lock)
+ spin_unlock_irqrestore(mux->lock, flags);
+ else
+ __release(mux->lock);
+
+ return 0;
+}
+
+const struct clk_ops mtk_mux_ops = {
+ .get_parent = mtk_clk_mux_get_parent,
+ .set_parent = mtk_clk_mux_set_parent_lock,
+};
+
+const struct clk_ops mtk_mux_clr_set_upd_ops = {
+ .get_parent = mtk_clk_mux_get_parent,
+ .set_parent = mtk_clk_mux_set_parent_setclr_lock,
+};
+
+const struct clk_ops mtk_mux_gate_ops = {
+ .enable = mtk_clk_mux_enable,
+ .disable = mtk_clk_mux_disable,
+ .is_enabled = mtk_clk_mux_is_enabled,
+ .get_parent = mtk_clk_mux_get_parent,
+ .set_parent = mtk_clk_mux_set_parent_lock,
+};
+
+const struct clk_ops mtk_mux_gate_clr_set_upd_ops = {
+ .enable = mtk_clk_mux_enable_setclr,
+ .disable = mtk_clk_mux_disable_setclr,
+ .is_enabled = mtk_clk_mux_is_enabled,
+ .get_parent = mtk_clk_mux_get_parent,
+ .set_parent = mtk_clk_mux_set_parent_setclr_lock,
+};
+
+struct clk *mtk_clk_register_mux(const struct mtk_mux *mux,
+ struct regmap *regmap,
+ spinlock_t *lock)
+{
+ struct mtk_clk_mux *clk_mux;
+ struct clk_init_data init = {};
+ struct clk *clk;
+
+ clk_mux = kzalloc(sizeof(*clk_mux), GFP_KERNEL);
+ if (!clk_mux)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = mux->name;
+ init.flags = mux->flags | CLK_SET_RATE_PARENT;
+ init.parent_names = mux->parent_names;
+ init.num_parents = mux->num_parents;
+ init.ops = mux->ops;
+
+ clk_mux->regmap = regmap;
+ clk_mux->data = mux;
+ clk_mux->lock = lock;
+ clk_mux->hw.init = &init;
+
+ clk = clk_register(NULL, &clk_mux->hw);
+ if (IS_ERR(clk)) {
+ kfree(clk_mux);
+ return clk;
+ }
+
+ return clk;
+}
+
+int mtk_clk_register_muxes(const struct mtk_mux *muxes,
+ int num, struct device_node *node,
+ spinlock_t *lock,
+ struct clk_onecell_data *clk_data)
+{
+ struct regmap *regmap;
+ struct clk *clk;
+ int i;
+
+ regmap = syscon_node_to_regmap(node);
+ if (IS_ERR(regmap)) {
+ pr_err("Cannot find regmap for %pOF: %ld\n", node,
+ PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ for (i = 0; i < num; i++) {
+ const struct mtk_mux *mux = &muxes[i];
+
+ if (IS_ERR_OR_NULL(clk_data->clks[mux->id])) {
+ clk = mtk_clk_register_mux(mux, regmap, lock);
+
+ if (IS_ERR(clk)) {
+ pr_err("Failed to register clk %s: %ld\n",
+ mux->name, PTR_ERR(clk));
+ continue;
+ }
+
+ clk_data->clks[mux->id] = clk;
+ }
+ }
+
+ return 0;
+}