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dfccb8b13c
Define a new type of configuration data, used to initialize the IPA core clock and interconnects. This is the first of three patches, and defines the data types and interface but doesn't yet use them. Switch the return value if there is no matching configuration data to ENODEV instead of ENOTSUPP (to avoid using the nonstandard errno). Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
64 lines
1.5 KiB
C
64 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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struct ipa_clock_data;
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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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* @data: Clock configuration data
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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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const struct ipa_clock_data *data);
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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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