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https://github.com/zephyrproject-rtos/zephyr
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14482f0940
Extend the public API of clock_control driver with a function for querying of clock rate driving given peripheral. This is useful when the driver must calculate or configurae values that depend on the rate of clock driving this subsystem. A baud rate setting of UART port is an example of such operation. To configure a particular baud rate the driver may need to set the internal counters of UART port, where the actual value will depend on the clock rate for this peripheral. The implementation returns DEV_NO_SUPPORT for clock_control drivers that do not implement such functionality. Change-Id: I4e7ec96cd3678a4bb1ff289b0247488289310f2d Origin: Original Signed-off-by: Maciej Borzecki <maciek.borzecki@gmail.com>
111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/* clock_control.h - public clock controller driver API */
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CLOCK_CONTROL_H__
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#define __CLOCK_CONTROL_H__
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#include <stdint.h>
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#include <stddef.h>
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#include <device.h>
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#include <misc/__assert.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Clock control API */
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/* Used to select all subsystem of a clock controller */
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#define CLOCK_CONTROL_SUBSYS_ALL NULL
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/**
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* clock_control_subsys_t is a type to identify a clock controller sub-system.
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* Such data pointed is opaque and relevant only to the clock controller
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* driver instance being used.
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*/
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typedef void *clock_control_subsys_t;
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typedef int (*clock_control)(struct device *dev, clock_control_subsys_t sys);
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typedef int (*clock_control_get)(struct device *dev,
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clock_control_subsys_t sys,
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uint32_t *rate);
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struct clock_control_driver_api {
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clock_control on;
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clock_control off;
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clock_control_get get_rate;
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};
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/**
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* @brief Enable the clock of a sub-system controlled by the device
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* @param dev Pointer to the device structure for the clock controller driver
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* instance
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* @param sys A pointer to an opaque data representing the sub-system
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*/
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static inline int clock_control_on(struct device *dev,
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clock_control_subsys_t sys)
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{
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struct clock_control_driver_api *api;
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api = (struct clock_control_driver_api *)dev->driver_api;
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return api->on(dev, sys);
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}
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/**
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* @brief Disable the clock of a sub-system controlled by the device
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* @param dev Pointer to the device structure for the clock controller driver
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* instance
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* @param sys A pointer to an opaque data representing the sub-system
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*/
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static inline int clock_control_off(struct device *dev,
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clock_control_subsys_t sys)
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{
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struct clock_control_driver_api *api;
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api = (struct clock_control_driver_api *)dev->driver_api;
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return api->off(dev, sys);
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}
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/**
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* @brief Obtain the clock rate of given sub-system
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* @param dev Pointer to the device structure for the clock controller driver
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* instance
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* @param sys A pointer to an opaque data representing the sub-system
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* @param[out] rate Subsystem clock rate
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*/
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static inline int clock_control_get_rate(struct device *dev,
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clock_control_subsys_t sys,
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uint32_t *rate)
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{
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struct clock_control_driver_api *api;
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api = (struct clock_control_driver_api *)dev->driver_api;
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__ASSERT(api->get_rate, "%s not implemented for device %s",
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__func__, dev->config->name);
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return api->get_rate(dev, sys, rate);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CLOCK_CONTROL_H__ */
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