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