Quelle  clk-regmap-divider.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/regmap.h>
#include <linux/export.h>

#include "clk-regmap-divider.h"

static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw)
{
 return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);
}

static long div_round_ro_rate(struct clk_hw *hw, unsigned long rate,
         unsigned long *prate)
{
 struct clk_regmap_div *divider = to_clk_regmap_div(hw);
 struct clk_regmap *clkr = ÷r->clkr;
 u32 val;

 regmap_read(clkr->regmap, divider->reg, &val);
 val >>= divider->shift;
 val &= BIT(divider->width) - 1;

 return divider_ro_round_rate(hw, rate, prate, NULL, divider->width,
         CLK_DIVIDER_ROUND_CLOSEST, val);
}

static long div_round_rate(struct clk_hw *hw, unsigned long rate,
      unsigned long *prate)
{
 struct clk_regmap_div *divider = to_clk_regmap_div(hw);

 return divider_round_rate(hw, rate, prate, NULL, divider->width,
      CLK_DIVIDER_ROUND_CLOSEST);
}

static int div_set_rate(struct clk_hw *hw, unsigned long rate,
   unsigned long parent_rate)
{
 struct clk_regmap_div *divider = to_clk_regmap_div(hw);
 struct clk_regmap *clkr = ÷r->clkr;
 u32 div;

 div = divider_get_val(rate, parent_rate, NULL, divider->width,
         CLK_DIVIDER_ROUND_CLOSEST);

 return regmap_update_bits(clkr->regmap, divider->reg,
      (BIT(divider->width) - 1) << divider->shift,
      div << divider->shift);
}

static unsigned long div_recalc_rate(struct clk_hw *hw,
         unsigned long parent_rate)
{
 struct clk_regmap_div *divider = to_clk_regmap_div(hw);
 struct clk_regmap *clkr = ÷r->clkr;
 u32 div;

 regmap_read(clkr->regmap, divider->reg, &div);
 div >>= divider->shift;
 div &= BIT(divider->width) - 1;

 return divider_recalc_rate(hw, parent_rate, div, NULL,
       CLK_DIVIDER_ROUND_CLOSEST, divider->width);
}

const struct clk_ops clk_regmap_div_ops = {
 .round_rate = div_round_rate,
 .set_rate = div_set_rate,
 .recalc_rate = div_recalc_rate,
};
EXPORT_SYMBOL_GPL(clk_regmap_div_ops);

const struct clk_ops clk_regmap_div_ro_ops = {
 .round_rate = div_round_ro_rate,
 .recalc_rate = div_recalc_rate,
};
EXPORT_SYMBOL_GPL(clk_regmap_div_ro_ops);