98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*
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* Copyright (C) 2016 Socionext Inc.
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* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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/device.h>
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#include <linux/regmap.h>
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#include "clk-uniphier.h"
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struct uniphier_clk_gate {
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struct clk_hw hw;
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struct regmap *regmap;
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unsigned int reg;
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unsigned int bit;
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};
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#define to_uniphier_clk_gate(_hw) \
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container_of(_hw, struct uniphier_clk_gate, hw)
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static int uniphier_clk_gate_endisable(struct clk_hw *hw, int enable)
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{
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struct uniphier_clk_gate *gate = to_uniphier_clk_gate(hw);
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return regmap_write_bits(gate->regmap, gate->reg, BIT(gate->bit),
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enable ? BIT(gate->bit) : 0);
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}
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static int uniphier_clk_gate_enable(struct clk_hw *hw)
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{
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return uniphier_clk_gate_endisable(hw, 1);
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}
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static void uniphier_clk_gate_disable(struct clk_hw *hw)
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{
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if (uniphier_clk_gate_endisable(hw, 0) < 0)
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pr_warn("failed to disable clk\n");
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}
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static int uniphier_clk_gate_is_enabled(struct clk_hw *hw)
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{
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struct uniphier_clk_gate *gate = to_uniphier_clk_gate(hw);
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unsigned int val;
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if (regmap_read(gate->regmap, gate->reg, &val) < 0)
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pr_warn("is_enabled() may return wrong result\n");
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return !!(val & BIT(gate->bit));
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}
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static const struct clk_ops uniphier_clk_gate_ops = {
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.enable = uniphier_clk_gate_enable,
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.disable = uniphier_clk_gate_disable,
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.is_enabled = uniphier_clk_gate_is_enabled,
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};
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struct clk_hw *uniphier_clk_register_gate(struct device *dev,
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struct regmap *regmap,
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const char *name,
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const struct uniphier_clk_gate_data *data)
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{
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struct uniphier_clk_gate *gate;
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struct clk_init_data init = {};
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int ret;
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gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL);
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if (!gate)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &uniphier_clk_gate_ops;
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init.flags = data->parent_name ? CLK_SET_RATE_PARENT : 0;
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init.parent_names = data->parent_name ? &data->parent_name : NULL;
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init.num_parents = data->parent_name ? 1 : 0;
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gate->regmap = regmap;
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gate->reg = data->reg;
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gate->bit = data->bit;
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gate->hw.init = &init;
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ret = devm_clk_hw_register(dev, &gate->hw);
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if (ret)
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return ERR_PTR(ret);
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return &gate->hw;
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}
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