73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
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/*
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* Copyright (c) 2019 BayLibre, SAS.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/module.h>
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#include "clk-regmap.h"
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#include "clk-cpu-dyndiv.h"
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static inline struct meson_clk_cpu_dyndiv_data *
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meson_clk_cpu_dyndiv_data(struct clk_regmap *clk)
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{
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return (struct meson_clk_cpu_dyndiv_data *)clk->data;
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}
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static unsigned long meson_clk_cpu_dyndiv_recalc_rate(struct clk_hw *hw,
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unsigned long prate)
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{
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struct clk_regmap *clk = to_clk_regmap(hw);
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struct meson_clk_cpu_dyndiv_data *data = meson_clk_cpu_dyndiv_data(clk);
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return divider_recalc_rate(hw, prate,
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meson_parm_read(clk->map, &data->div),
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NULL, 0, data->div.width);
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}
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static int meson_clk_cpu_dyndiv_determine_rate(struct clk_hw *hw,
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struct clk_rate_request *req)
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{
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struct clk_regmap *clk = to_clk_regmap(hw);
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struct meson_clk_cpu_dyndiv_data *data = meson_clk_cpu_dyndiv_data(clk);
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return divider_determine_rate(hw, req, NULL, data->div.width, 0);
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}
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static int meson_clk_cpu_dyndiv_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct clk_regmap *clk = to_clk_regmap(hw);
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struct meson_clk_cpu_dyndiv_data *data = meson_clk_cpu_dyndiv_data(clk);
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unsigned int val;
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int ret;
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ret = divider_get_val(rate, parent_rate, NULL, data->div.width, 0);
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if (ret < 0)
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return ret;
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val = (unsigned int)ret << data->div.shift;
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/* Write the SYS_CPU_DYN_ENABLE bit before changing the divider */
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meson_parm_write(clk->map, &data->dyn, 1);
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/* Update the divider while removing the SYS_CPU_DYN_ENABLE bit */
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return regmap_update_bits(clk->map, data->div.reg_off,
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SETPMASK(data->div.width, data->div.shift) |
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SETPMASK(data->dyn.width, data->dyn.shift),
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val);
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};
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const struct clk_ops meson_clk_cpu_dyndiv_ops = {
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.recalc_rate = meson_clk_cpu_dyndiv_recalc_rate,
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.determine_rate = meson_clk_cpu_dyndiv_determine_rate,
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.set_rate = meson_clk_cpu_dyndiv_set_rate,
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};
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EXPORT_SYMBOL_GPL(meson_clk_cpu_dyndiv_ops);
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MODULE_DESCRIPTION("Amlogic CPU Dynamic Clock divider");
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MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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