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linux-next/drivers/clk/qcom/clk-regmap.c
Stephen Boyd 085d7a4554 clk: qcom: Add a regmap type clock struct
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>
2014-01-16 12:00:58 -08:00

115 lines
3.1 KiB
C

/*
* 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);