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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_INTERRUPT_H_
#define _IPA_INTERRUPT_H_
#include <linux/types.h>
#include <linux/bits.h>
struct ipa;
struct ipa_interrupt;
/**
* enum ipa_irq_id - IPA interrupt type
* @IPA_IRQ_UC_0: Microcontroller event interrupt
* @IPA_IRQ_UC_1: Microcontroller response interrupt
* @IPA_IRQ_TX_SUSPEND: Data ready interrupt
*
* The data ready interrupt is signaled if data has arrived that is destined
* for an AP RX endpoint whose underlying GSI channel is suspended/stopped.
*/
enum ipa_irq_id {
IPA_IRQ_UC_0 = 2,
IPA_IRQ_UC_1 = 3,
IPA_IRQ_TX_SUSPEND = 14,
IPA_IRQ_COUNT, /* Number of interrupt types (not an index) */
};
/**
* typedef ipa_irq_handler_t - IPA interrupt handler function type
* @ipa: IPA pointer
* @irq_id: interrupt type
*
* Callback function registered by ipa_interrupt_add() to handle a specific
* IPA interrupt type
*/
typedef void (*ipa_irq_handler_t)(struct ipa *ipa, enum ipa_irq_id irq_id);
/**
* ipa_interrupt_add() - Register a handler for an IPA interrupt type
* @irq_id: IPA interrupt type
* @handler: Handler function for the interrupt
*
* Add a handler for an IPA interrupt and enable it. IPA interrupt
* handlers are run in threaded interrupt context, so are allowed to
* block.
*/
void ipa_interrupt_add(struct ipa_interrupt *interrupt, enum ipa_irq_id irq_id,
ipa_irq_handler_t handler);
/**
* ipa_interrupt_remove() - Remove the handler for an IPA interrupt type
* @interrupt: IPA interrupt structure
* @irq_id: IPA interrupt type
*
* Remove an IPA interrupt handler and disable it.
*/
void ipa_interrupt_remove(struct ipa_interrupt *interrupt,
enum ipa_irq_id irq_id);
/**
* ipa_interrupt_suspend_enable - Enable TX_SUSPEND for an endpoint
* @interrupt: IPA interrupt structure
* @endpoint_id: Endpoint whose interrupt should be enabled
*
* Note: The "TX" in the name is from the perspective of the IPA hardware.
* A TX_SUSPEND interrupt arrives on an AP RX enpoint when packet data can't
* be delivered to the endpoint because it is suspended (or its underlying
* channel is stopped).
*/
void ipa_interrupt_suspend_enable(struct ipa_interrupt *interrupt,
u32 endpoint_id);
/**
* ipa_interrupt_suspend_disable - Disable TX_SUSPEND for an endpoint
* @interrupt: IPA interrupt structure
* @endpoint_id: Endpoint whose interrupt should be disabled
*/
void ipa_interrupt_suspend_disable(struct ipa_interrupt *interrupt,
u32 endpoint_id);
/**
* ipa_interrupt_suspend_clear_all - clear all suspend interrupts
* @interrupt: IPA interrupt structure
*
* Clear the TX_SUSPEND interrupt for all endpoints that signaled it.
*/
void ipa_interrupt_suspend_clear_all(struct ipa_interrupt *interrupt);
/**
* ipa_interrupt_simulate_suspend() - Simulate TX_SUSPEND IPA interrupt
* @interrupt: IPA interrupt structure
*
* This calls the TX_SUSPEND interrupt handler, as if such an interrupt
* had been signaled. This is needed to work around a hardware quirk
* that occurs if aggregation is active on an endpoint when its underlying
* channel is suspended.
*/
void ipa_interrupt_simulate_suspend(struct ipa_interrupt *interrupt);
/**
* ipa_interrupt_setup() - Set up the IPA interrupt framework
* @ipa: IPA pointer
*
* Return: Pointer to IPA SMP2P info, or a pointer-coded error
*/
struct ipa_interrupt *ipa_interrupt_setup(struct ipa *ipa);
/**
* ipa_interrupt_teardown() - Tear down the IPA interrupt framework
* @interrupt: IPA interrupt structure
*/
void ipa_interrupt_teardown(struct ipa_interrupt *interrupt);
#endif /* _IPA_INTERRUPT_H_ */
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