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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2018-2020 Linaro Ltd.
*/
#ifndef _IPA_CLOCK_H_
#define _IPA_CLOCK_H_
struct device;
struct ipa;
/**
* ipa_clock_rate() - Return the current IPA core clock rate
* @ipa: IPA structure
*
* Return: The current clock rate (in Hz), or 0.
*/
u32 ipa_clock_rate(struct ipa *ipa);
/**
* ipa_clock_init() - Initialize IPA clocking
* @dev: IPA device
*
* Return: A pointer to an ipa_clock structure, or a pointer-coded error
*/
struct ipa_clock *ipa_clock_init(struct device *dev);
/**
* ipa_clock_exit() - Inverse of ipa_clock_init()
* @clock: IPA clock pointer
*/
void ipa_clock_exit(struct ipa_clock *clock);
/**
* ipa_clock_get() - Get an IPA clock reference
* @ipa: IPA pointer
*
* This call blocks if this is the first reference.
*/
void ipa_clock_get(struct ipa *ipa);
/**
* ipa_clock_get_additional() - Get an IPA clock reference if not first
* @ipa: IPA pointer
*
* This returns immediately, and only takes a reference if not the first
*/
bool ipa_clock_get_additional(struct ipa *ipa);
/**
* ipa_clock_put() - Drop an IPA clock reference
* @ipa: IPA pointer
*
* This drops a clock reference. If the last reference is being dropped,
* the clock is stopped and RX endpoints are suspended. This call will
* not block unless the last reference is dropped.
*/
void ipa_clock_put(struct ipa *ipa);
#endif /* _IPA_CLOCK_H_ */
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