에프에이리눅스 / 1611_0007_prime_oven

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kernel/linux-imx6_3.14.28/drivers/clk/qcom/clk-regmap.c 3.15 KB
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6b13f685e   김민수   BSP 최초 추가 
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  /*
   * 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/device.h>
  #include <linux/clk-provider.h>
  #include <linux/regmap.h>
  #include <linux/export.h>
  
  #include "clk-regmap.h"
  
  /**
   * clk_is_enabled_regmap - standard is_enabled() for regmap users
   *
   * @hw: clk to operate on
   *
   * Clocks that use regmap for their register I/O can set the
   * enable_reg and enable_mask fields in their struct clk_regmap and then use
   * this as their is_enabled operation, saving some code.
   */
  int clk_is_enabled_regmap(struct clk_hw *hw)
  {
  	struct clk_regmap *rclk = to_clk_regmap(hw);
  	unsigned int val;
  	int ret;
  
  	ret = regmap_read(rclk->regmap, rclk->enable_reg, &val);
  	if (ret != 0)
  		return ret;
  
  	if (rclk->enable_is_inverted)
  		return (val & rclk->enable_mask) == 0;
  	else
  		return (val & rclk->enable_mask) != 0;
  }
  EXPORT_SYMBOL_GPL(clk_is_enabled_regmap);
  
  /**
   * clk_enable_regmap - standard enable() for regmap users
   *
   * @hw: clk to operate on
   *
   * Clocks that use regmap for their register I/O can set the
   * enable_reg and enable_mask fields in their struct clk_regmap and then use
   * this as their enable() operation, saving some code.
   */
  int clk_enable_regmap(struct clk_hw *hw)
  {
  	struct clk_regmap *rclk = to_clk_regmap(hw);
  	unsigned int val;
  
  	if (rclk->enable_is_inverted)
  		val = 0;
  	else
  		val = rclk->enable_mask;
  
  	return regmap_update_bits(rclk->regmap, rclk->enable_reg,
  				  rclk->enable_mask, val);
  }
  EXPORT_SYMBOL_GPL(clk_enable_regmap);
  
  /**
   * clk_disable_regmap - standard disable() for regmap users
   *
   * @hw: clk to operate on
   *
   * Clocks that use regmap for their register I/O can set the
   * enable_reg and enable_mask fields in their struct clk_regmap and then use
   * this as their disable() operation, saving some code.
   */
  void clk_disable_regmap(struct clk_hw *hw)
  {
  	struct clk_regmap *rclk = to_clk_regmap(hw);
  	unsigned int val;
  
  	if (rclk->enable_is_inverted)
  		val = rclk->enable_mask;
  	else
  		val = 0;
  
  	regmap_update_bits(rclk->regmap, rclk->enable_reg, rclk->enable_mask,
  			   val);
  }
  EXPORT_SYMBOL_GPL(clk_disable_regmap);
  
  /**
   * devm_clk_register_regmap - register a clk_regmap clock
   *
   * @rclk: clk to operate on
   *
   * Clocks that use regmap for their register I/O should register their
   * clk_regmap struct via this function so that the regmap is initialized
   * and so that the clock is registered with the common clock framework.
   */
  struct clk *devm_clk_register_regmap(struct device *dev,
  				     struct clk_regmap *rclk)
  {
  	if (dev && dev_get_regmap(dev, NULL))
  		rclk->regmap = dev_get_regmap(dev, NULL);
  	else if (dev && dev->parent)
  		rclk->regmap = dev_get_regmap(dev->parent, NULL);
  
  	return devm_clk_register(dev, &rclk->hw);
  }
  EXPORT_SYMBOL_GPL(devm_clk_register_regmap);