text: /*
   * Copyright (c) 2014, The Linux Foundation. All rights reserved.
   *
   * This software is licensed under the terms of the GNU General Public
   * License version 2, as published by the Free Software Foundation, and
   * may be copied, distributed, and modified under those terms.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  
  #include <linux/kernel.h>
  #include <linux/bitops.h>
  #include <linux/regmap.h>
  #include <linux/export.h>
  
  #include "clk-regmap-mux.h"
  
  static inline struct clk_regmap_mux *to_clk_regmap_mux(struct clk_hw *hw)
  {
  	return container_of(to_clk_regmap(hw), struct clk_regmap_mux, clkr);
  }
  
  static u8 mux_get_parent(struct clk_hw *hw)
  {
  	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
  	struct clk_regmap *clkr = to_clk_regmap(hw);
  	unsigned int mask = GENMASK(mux->width - 1, 0);
  	unsigned int val;
  
  	regmap_read(clkr->regmap, mux->reg, &val);
  
  	val >>= mux->shift;
  	val &= mask;
  
  	return val;
  }
  
  static int mux_set_parent(struct clk_hw *hw, u8 index)
  {
  	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
  	struct clk_regmap *clkr = to_clk_regmap(hw);
  	unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
  	unsigned int val;
  
  	val = index;
  	val <<= mux->shift;
  
  	return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
  }
  
  const struct clk_ops clk_regmap_mux_closest_ops = {
  	.get_parent = mux_get_parent,
  	.set_parent = mux_set_parent,
  	.determine_rate = __clk_mux_determine_rate_closest,
  };
  EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);
  