diff options
| -rw-r--r-- | drivers/clk/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/clk/Makefile | 1 | ||||
| -rw-r--r-- | drivers/clk/qcom/Kconfig | 5 | ||||
| -rw-r--r-- | drivers/clk/qcom/Makefile | 3 | ||||
| -rw-r--r-- | drivers/clk/qcom/clk-regmap.c | 114 | ||||
| -rw-r--r-- | drivers/clk/qcom/clk-regmap.h | 45 |
6 files changed, 170 insertions, 0 deletions
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 407cffb04895..7641965d208d 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -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" diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index fcaa5b8d4e62..972da894baa1 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -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/ diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig new file mode 100644 index 000000000000..73a8c8fb547f --- /dev/null +++ b/drivers/clk/qcom/Kconfig @@ -0,0 +1,5 @@ +config COMMON_CLK_QCOM + tristate "Support for Qualcomm's clock controllers" + depends on OF + select REGMAP_MMIO + diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile new file mode 100644 index 000000000000..f9faa8fa9392 --- /dev/null +++ b/drivers/clk/qcom/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_COMMON_CLK_QCOM) += clk-qcom.o + +clk-qcom-$(CONFIG_COMMON_CLK_QCOM) += clk-regmap.o diff --git a/drivers/clk/qcom/clk-regmap.c b/drivers/clk/qcom/clk-regmap.c new file mode 100644 index 000000000000..a58ba39a900c --- /dev/null +++ b/drivers/clk/qcom/clk-regmap.c @@ -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); diff --git a/drivers/clk/qcom/clk-regmap.h b/drivers/clk/qcom/clk-regmap.h new file mode 100644 index 000000000000..491a63d537df --- /dev/null +++ b/drivers/clk/qcom/clk-regmap.h @@ -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 |