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>
This commit is contained in:
Stephen Boyd 2014-01-15 10:47:23 -08:00 committed by Mike Turquette
parent 3fa2252b7a
commit 085d7a4554
6 changed files with 170 additions and 0 deletions

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@ -107,6 +107,8 @@ config COMMON_CLK_KEYSTONE
Supports clock drivers for Keystone based SOCs. These SOCs have local
a power sleep control module that gate the clock to the IPs and PLLs.
source "drivers/clk/qcom/Kconfig"
endmenu
source "drivers/clk/mvebu/Kconfig"

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@ -21,6 +21,7 @@ obj-$(CONFIG_ARCH_SOCFPGA) += socfpga/
obj-$(CONFIG_PLAT_SPEAR) += spear/
obj-$(CONFIG_ARCH_U300) += clk-u300.o
obj-$(CONFIG_COMMON_CLK_VERSATILE) += versatile/
obj-$(CONFIG_COMMON_CLK_QCOM) += qcom/
obj-$(CONFIG_PLAT_ORION) += mvebu/
ifeq ($(CONFIG_COMMON_CLK), y)
obj-$(CONFIG_ARCH_MMP) += mmp/

5
drivers/clk/qcom/Kconfig Normal file
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@ -0,0 +1,5 @@
config COMMON_CLK_QCOM
tristate "Support for Qualcomm's clock controllers"
depends on OF
select REGMAP_MMIO

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@ -0,0 +1,3 @@
obj-$(CONFIG_COMMON_CLK_QCOM) += clk-qcom.o
clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-regmap.o

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@ -0,0 +1,114 @@
/*
* 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);

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@ -0,0 +1,45 @@
/*
* 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.
*/
#ifndef __QCOM_CLK_REGMAP_H__
#define __QCOM_CLK_REGMAP_H__
#include <linux/clk-provider.h>
struct regmap;
/**
* struct clk_regmap - regmap supporting clock
* @hw: handle between common and hardware-specific interfaces
* @regmap: regmap to use for regmap helpers and/or by providers
* @enable_reg: register when using regmap enable/disable ops
* @enable_mask: mask when using regmap enable/disable ops
* @enable_is_inverted: flag to indicate set enable_mask bits to disable
* when using clock_enable_regmap and friends APIs.
*/
struct clk_regmap {
struct clk_hw hw;
struct regmap *regmap;
unsigned int enable_reg;
unsigned int enable_mask;
bool enable_is_inverted;
};
#define to_clk_regmap(_hw) container_of(_hw, struct clk_regmap, hw)
int clk_is_enabled_regmap(struct clk_hw *hw);
int clk_enable_regmap(struct clk_hw *hw);
void clk_disable_regmap(struct clk_hw *hw);
struct clk *
devm_clk_register_regmap(struct device *dev, struct clk_regmap *rclk);
#endif