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085d7a4554
Add a clock type that associates a regmap pointer and some enable/disable bits with a clk_hw struct. This will be the struct that a hw specific implementation wraps if it wants to use the regmap helper functions. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/clk-provider.h>
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#include <linux/regmap.h>
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#include <linux/export.h>
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#include "clk-regmap.h"
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/**
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* clk_is_enabled_regmap - standard is_enabled() for regmap users
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*
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* @hw: clk to operate on
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*
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* Clocks that use regmap for their register I/O can set the
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* enable_reg and enable_mask fields in their struct clk_regmap and then use
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* this as their is_enabled operation, saving some code.
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*/
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int clk_is_enabled_regmap(struct clk_hw *hw)
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{
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struct clk_regmap *rclk = to_clk_regmap(hw);
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unsigned int val;
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int ret;
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ret = regmap_read(rclk->regmap, rclk->enable_reg, &val);
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if (ret != 0)
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return ret;
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if (rclk->enable_is_inverted)
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return (val & rclk->enable_mask) == 0;
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else
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return (val & rclk->enable_mask) != 0;
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}
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EXPORT_SYMBOL_GPL(clk_is_enabled_regmap);
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/**
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* clk_enable_regmap - standard enable() for regmap users
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*
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* @hw: clk to operate on
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*
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* Clocks that use regmap for their register I/O can set the
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* enable_reg and enable_mask fields in their struct clk_regmap and then use
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* this as their enable() operation, saving some code.
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*/
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int clk_enable_regmap(struct clk_hw *hw)
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{
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struct clk_regmap *rclk = to_clk_regmap(hw);
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unsigned int val;
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if (rclk->enable_is_inverted)
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val = 0;
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else
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val = rclk->enable_mask;
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return regmap_update_bits(rclk->regmap, rclk->enable_reg,
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rclk->enable_mask, val);
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}
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EXPORT_SYMBOL_GPL(clk_enable_regmap);
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/**
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* clk_disable_regmap - standard disable() for regmap users
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*
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* @hw: clk to operate on
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*
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* Clocks that use regmap for their register I/O can set the
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* enable_reg and enable_mask fields in their struct clk_regmap and then use
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* this as their disable() operation, saving some code.
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*/
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void clk_disable_regmap(struct clk_hw *hw)
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{
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struct clk_regmap *rclk = to_clk_regmap(hw);
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unsigned int val;
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if (rclk->enable_is_inverted)
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val = rclk->enable_mask;
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else
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val = 0;
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regmap_update_bits(rclk->regmap, rclk->enable_reg, rclk->enable_mask,
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val);
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}
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EXPORT_SYMBOL_GPL(clk_disable_regmap);
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/**
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* devm_clk_register_regmap - register a clk_regmap clock
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*
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* @rclk: clk to operate on
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*
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* Clocks that use regmap for their register I/O should register their
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* clk_regmap struct via this function so that the regmap is initialized
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* and so that the clock is registered with the common clock framework.
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*/
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struct clk *devm_clk_register_regmap(struct device *dev,
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struct clk_regmap *rclk)
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{
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if (dev && dev_get_regmap(dev, NULL))
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rclk->regmap = dev_get_regmap(dev, NULL);
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else if (dev && dev->parent)
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rclk->regmap = dev_get_regmap(dev->parent, NULL);
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return devm_clk_register(dev, &rclk->hw);
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}
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EXPORT_SYMBOL_GPL(devm_clk_register_regmap);
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