/*
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* SPDX-License-Identifier: GPL-2.0
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*
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* Copyright (C) 2020 Philippe Gerum <rpm@xenomai.org>
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*/
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#ifndef _COBALT_KERNEL_DOVETAIL_SIRQ_H
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#define _COBALT_KERNEL_DOVETAIL_SIRQ_H
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#include <linux/irq_pipeline.h>
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#include <cobalt/kernel/assert.h>
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/*
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* Wrappers to create "synthetic IRQs" the Dovetail way. Those
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* interrupt channels can only be trigged by software, in order to run
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* a handler on the in-band execution stage.
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*/
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static inline
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int pipeline_create_inband_sirq(irqreturn_t (*handler)(int irq, void *dev_id))
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{
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/*
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* Allocate an IRQ from the synthetic interrupt domain then
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* trap it to @handler, to be fired from the in-band stage.
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*/
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int sirq, ret;
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sirq = irq_create_direct_mapping(synthetic_irq_domain);
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if (sirq == 0)
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return -EAGAIN;
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ret = __request_percpu_irq(sirq,
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handler,
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IRQF_NO_THREAD,
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"Inband sirq",
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&cobalt_machine_cpudata);
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if (ret) {
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irq_dispose_mapping(sirq);
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return ret;
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}
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return sirq;
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}
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static inline
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void pipeline_delete_inband_sirq(int sirq)
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{
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/*
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* Free the synthetic IRQ then deallocate it to its
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* originating domain.
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*/
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free_percpu_irq(sirq,
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&cobalt_machine_cpudata);
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irq_dispose_mapping(sirq);
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}
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static inline void pipeline_post_sirq(int sirq)
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{
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/* Trigger the synthetic IRQ */
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irq_post_inband(sirq);
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}
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#endif /* !_COBALT_KERNEL_DOVETAIL_SIRQ_H */
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