117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/*
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* Copyright (c) 2015 Linaro Ltd.
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* Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/mfd/syscon.h>
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#include <linux/slab.h>
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#include "clk-mtk.h"
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#include "clk-cpumux.h"
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static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
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{
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return container_of(_hw, struct mtk_clk_cpumux, hw);
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}
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static u8 clk_cpumux_get_parent(struct clk_hw *hw)
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{
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struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
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unsigned int val;
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regmap_read(mux->regmap, mux->reg, &val);
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val >>= mux->shift;
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val &= mux->mask;
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return val;
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}
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static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
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{
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struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
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u32 mask, val;
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val = index << mux->shift;
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mask = mux->mask << mux->shift;
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return regmap_update_bits(mux->regmap, mux->reg, mask, val);
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}
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static const struct clk_ops clk_cpumux_ops = {
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.get_parent = clk_cpumux_get_parent,
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.set_parent = clk_cpumux_set_parent,
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};
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static struct clk __init *
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mtk_clk_register_cpumux(const struct mtk_composite *mux,
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struct regmap *regmap)
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{
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struct mtk_clk_cpumux *cpumux;
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struct clk *clk;
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struct clk_init_data init;
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cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL);
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if (!cpumux)
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return ERR_PTR(-ENOMEM);
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init.name = mux->name;
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init.ops = &clk_cpumux_ops;
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init.parent_names = mux->parent_names;
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init.num_parents = mux->num_parents;
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init.flags = mux->flags;
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cpumux->reg = mux->mux_reg;
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cpumux->shift = mux->mux_shift;
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cpumux->mask = BIT(mux->mux_width) - 1;
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cpumux->regmap = regmap;
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cpumux->hw.init = &init;
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clk = clk_register(NULL, &cpumux->hw);
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if (IS_ERR(clk))
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kfree(cpumux);
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return clk;
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}
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int __init mtk_clk_register_cpumuxes(struct device_node *node,
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const struct mtk_composite *clks, int num,
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struct clk_onecell_data *clk_data)
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{
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int i;
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struct clk *clk;
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struct regmap *regmap;
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regmap = syscon_node_to_regmap(node);
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if (IS_ERR(regmap)) {
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pr_err("Cannot find regmap for %s: %ld\n", node->full_name,
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PTR_ERR(regmap));
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return PTR_ERR(regmap);
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}
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for (i = 0; i < num; i++) {
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const struct mtk_composite *mux = &clks[i];
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clk = mtk_clk_register_cpumux(mux, regmap);
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if (IS_ERR(clk)) {
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pr_err("Failed to register clk %s: %ld\n",
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mux->name, PTR_ERR(clk));
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continue;
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}
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clk_data->clks[mux->id] = clk;
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}
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return 0;
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}
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