mirror of https://gitee.com/openkylin/linux.git
116 lines
3.0 KiB
C
116 lines
3.0 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/delay.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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#define UNIPHIER_CLK_CPUGEAR_STAT 0 /* status */
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#define UNIPHIER_CLK_CPUGEAR_SET 4 /* set */
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#define UNIPHIER_CLK_CPUGEAR_UPD 8 /* update */
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#define UNIPHIER_CLK_CPUGEAR_UPD_BIT BIT(0)
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struct uniphier_clk_cpugear {
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struct clk_hw hw;
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struct regmap *regmap;
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unsigned int regbase;
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unsigned int mask;
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};
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#define to_uniphier_clk_cpugear(_hw) \
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container_of(_hw, struct uniphier_clk_cpugear, hw)
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static int uniphier_clk_cpugear_set_parent(struct clk_hw *hw, u8 index)
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{
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struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
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int ret;
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unsigned int val;
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ret = regmap_write_bits(gear->regmap,
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gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
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gear->mask, index);
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if (ret)
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return ret;
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ret = regmap_write_bits(gear->regmap,
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gear->regbase + UNIPHIER_CLK_CPUGEAR_SET,
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UNIPHIER_CLK_CPUGEAR_UPD_BIT,
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UNIPHIER_CLK_CPUGEAR_UPD_BIT);
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if (ret)
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return ret;
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return regmap_read_poll_timeout(gear->regmap,
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gear->regbase + UNIPHIER_CLK_CPUGEAR_UPD,
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val, !(val & UNIPHIER_CLK_CPUGEAR_UPD_BIT),
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0, 1);
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}
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static u8 uniphier_clk_cpugear_get_parent(struct clk_hw *hw)
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{
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struct uniphier_clk_cpugear *gear = to_uniphier_clk_cpugear(hw);
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int num_parents = clk_hw_get_num_parents(hw);
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int ret;
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unsigned int val;
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ret = regmap_read(gear->regmap,
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gear->regbase + UNIPHIER_CLK_CPUGEAR_STAT, &val);
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if (ret)
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return ret;
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val &= gear->mask;
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return val < num_parents ? val : -EINVAL;
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}
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static const struct clk_ops uniphier_clk_cpugear_ops = {
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.determine_rate = __clk_mux_determine_rate,
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.set_parent = uniphier_clk_cpugear_set_parent,
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.get_parent = uniphier_clk_cpugear_get_parent,
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};
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struct clk_hw *uniphier_clk_register_cpugear(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_cpugear_data *data)
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{
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struct uniphier_clk_cpugear *gear;
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struct clk_init_data init;
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int ret;
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gear = devm_kzalloc(dev, sizeof(*gear), GFP_KERNEL);
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if (!gear)
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return ERR_PTR(-ENOMEM);
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init.name = name;
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init.ops = &uniphier_clk_cpugear_ops;
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init.flags = CLK_SET_RATE_PARENT;
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init.parent_names = data->parent_names;
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init.num_parents = data->num_parents,
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gear->regmap = regmap;
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gear->regbase = data->regbase;
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gear->mask = data->mask;
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gear->hw.init = &init;
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ret = devm_clk_hw_register(dev, &gear->hw);
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if (ret)
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return ERR_PTR(ret);
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return &gear->hw;
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}
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