// 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 = { .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; } static void mtk_clk_unregister_cpumux(struct clk *clk) { struct mtk_clk_cpumux *cpumux; struct clk_hw *hw; hw = __clk_get_hw(clk); if (!hw) return; cpumux = to_mtk_clk_cpumux(hw); clk_unregister(clk); kfree(cpumux); } 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 = 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->clks[mux->id])) { pr_warn("%pOF: Trying to register duplicate clock ID: %d\n", node, mux->id); continue; } clk = mtk_clk_register_cpumux(mux, regmap); if (IS_ERR(clk)) { pr_err("Failed to register clk %s: %pe\n", mux->name, clk); goto err; } clk_data->clks[mux->id] = clk; } return 0; err: while (--i >= 0) { const struct mtk_composite *mux = &clks[i]; if (IS_ERR_OR_NULL(clk_data->clks[mux->id])) continue; mtk_clk_unregister_cpumux(clk_data->clks[mux->id]); clk_data->clks[mux->id] = ERR_PTR(-ENOENT); } return PTR_ERR(clk); } void mtk_clk_unregister_cpumuxes(const struct mtk_composite *clks, int num, struct clk_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->clks[mux->id])) continue; mtk_clk_unregister_cpumux(clk_data->clks[mux->id]); clk_data->clks[mux->id] = ERR_PTR(-ENOENT); } } MODULE_LICENSE("GPL");