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clock: add Quark SE clock control

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Quark SE provides various clock controllers through its SCSS block.
Peripheral, external, sensor, and others.

This current drivers provides only the clock gating capability, for
peripheral, external and sensor. But it could support divider and more
other features once defined in the generic API.

Note: such clock has _nothing_ to do with a Real Time Clock (RTC).
An RTC provide clock timing like a watch would do. Here the clock
controller is about circuit clocking.

Change-Id: I1a365ae730dfc6be7686271f7fbb693e64a6ff6f
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2015-11-21 21:16:01 -05:00 • committed by Anas Nashif
commit 714dd9786b
7 changed files with 376 additions and 0 deletions
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include/clock_control.h Normal file
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/* clock_control.h - public clock controller driver API */
/*
* Copyright (c) 2015 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __CLOCK_CONTROL_H__
#define __CLOCK_CONTROL_H__
#include <stdint.h>
#include <stddef.h>
#include <device.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Clock control API */
/* Used to select all subsystem of a clock controller */
#define CLOCK_CONTROL_SUBSYS_ALL NULL
/**
* clock_control_subsys_t is a type to identify a clock controller sub-system.
* Such data pointed is opaque and relevant only to the clock controller
* driver instance being used.
*/
typedef void *clock_control_subsys_t;
typedef int (*clock_control)(struct device *dev, clock_control_subsys_t sys);
struct clock_control_driver_api {
clock_control on;
clock_control off;
};
/**
* @brief Enable the clock of a sub-system controlled by the device
* @param dev Pointer to the device structure for the clock controller driver
* instance
* @param sys A pointer to an opaque data representing the sub-system
*/
static inline int clock_control_on(struct device *dev,
clock_control_subsys_t sys)
{
struct clock_control_driver_api *api;
api = (struct clock_control_driver_api *)dev->driver_api;
return api->on(dev, sys);
}
/**
* @brief Disable the clock of a sub-system controlled by the device
* @param dev Pointer to the device structure for the clock controller driver
* instance
* @param sys A pointer to an opaque data representing the sub-system
*/
static inline int clock_control_off(struct device *dev,
clock_control_subsys_t sys)
{
struct clock_control_driver_api *api;
api = (struct clock_control_driver_api *)dev->driver_api;
return api->off(dev, sys);
}
#ifdef __cplusplus
}
#endif
#endif /* __CLOCK_CONTROL_H__ */