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- // 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/mfd/syscon.h>
- #include <linux/slab.h>
- #include "clk-mtk.h"
- #include "clk-cpumux.h"
- 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 = {
- .get_parent = clk_cpumux_get_parent,
- .set_parent = clk_cpumux_set_parent,
- };
- static struct clk *
- mtk_clk_register_cpumux(const struct mtk_composite *mux,
- struct regmap *regmap)
- {
- struct mtk_clk_cpumux *cpumux;
- struct clk *clk;
- 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;
- clk = clk_register(NULL, &cpumux->hw);
- if (IS_ERR(clk))
- kfree(cpumux);
- return clk;
- }
- int mtk_clk_register_cpumuxes(struct device_node *node,
- const struct mtk_composite *clks, int num,
- struct clk_onecell_data *clk_data)
- {
- int i;
- struct clk *clk;
- struct regmap *regmap;
- 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_composite *mux = &clks[i];
- clk = mtk_clk_register_cpumux(mux, regmap);
- 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;
- }
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