84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/regmap.h>
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#include <linux/export.h>
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#include "clk-regmap-divider.h"
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static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw)
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{
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return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);
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}
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static long div_round_ro_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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struct clk_regmap_div *divider = to_clk_regmap_div(hw);
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struct clk_regmap *clkr = ÷r->clkr;
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u32 val;
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regmap_read(clkr->regmap, divider->reg, &val);
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val >>= divider->shift;
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val &= BIT(divider->width) - 1;
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return divider_ro_round_rate(hw, rate, prate, NULL, divider->width,
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CLK_DIVIDER_ROUND_CLOSEST, val);
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}
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static long div_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *prate)
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{
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struct clk_regmap_div *divider = to_clk_regmap_div(hw);
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return divider_round_rate(hw, rate, prate, NULL, divider->width,
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CLK_DIVIDER_ROUND_CLOSEST);
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}
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static int div_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_div *divider = to_clk_regmap_div(hw);
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struct clk_regmap *clkr = ÷r->clkr;
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u32 div;
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div = divider_get_val(rate, parent_rate, NULL, divider->width,
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CLK_DIVIDER_ROUND_CLOSEST);
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return regmap_update_bits(clkr->regmap, divider->reg,
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(BIT(divider->width) - 1) << divider->shift,
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div << divider->shift);
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}
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static unsigned long div_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct clk_regmap_div *divider = to_clk_regmap_div(hw);
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struct clk_regmap *clkr = ÷r->clkr;
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u32 div;
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regmap_read(clkr->regmap, divider->reg, &div);
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div >>= divider->shift;
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div &= BIT(divider->width) - 1;
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return divider_recalc_rate(hw, parent_rate, div, NULL,
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CLK_DIVIDER_ROUND_CLOSEST, divider->width);
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}
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const struct clk_ops clk_regmap_div_ops = {
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.round_rate = div_round_rate,
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.set_rate = div_set_rate,
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.recalc_rate = div_recalc_rate,
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};
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EXPORT_SYMBOL_GPL(clk_regmap_div_ops);
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const struct clk_ops clk_regmap_div_ro_ops = {
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.round_rate = div_round_ro_rate,
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.recalc_rate = div_recalc_rate,
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};
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EXPORT_SYMBOL_GPL(clk_regmap_div_ro_ops);
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