// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for Intel Camera Imaging ISP subsystem.
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* Copyright (c) 2015, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include "ia_css_types.h"
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#include "assert_support.h"
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#include "ia_css_queue.h" /* sp2host_dequeue_irq_event() */
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#include "ia_css_eventq.h"
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#include "ia_css_event.h" /* ia_css_event_encode()
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ia_css_event_decode()
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*/
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int ia_css_eventq_recv(
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ia_css_queue_t *eventq_handle,
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uint8_t *payload)
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{
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u32 sp_event;
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int error;
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/* dequeue the IRQ event */
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error = ia_css_queue_dequeue(eventq_handle, &sp_event);
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/* check whether the IRQ event is available or not */
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if (!error)
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ia_css_event_decode(sp_event, payload);
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return error;
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}
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/*
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* @brief The Host sends the event to the SP.
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* Refer to "sh_css_sp.h" for details.
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*/
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int ia_css_eventq_send(
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ia_css_queue_t *eventq_handle,
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u8 evt_id,
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u8 evt_payload_0,
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u8 evt_payload_1,
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uint8_t evt_payload_2)
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{
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u8 tmp[4];
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u32 sw_event;
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int error = -ENOSYS;
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/*
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* Encode the queue type, the thread ID and
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* the queue ID into the event.
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*/
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tmp[0] = evt_id;
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tmp[1] = evt_payload_0;
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tmp[2] = evt_payload_1;
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tmp[3] = evt_payload_2;
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ia_css_event_encode(tmp, 4, &sw_event);
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/* queue the software event (busy-waiting) */
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for ( ; ; ) {
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error = ia_css_queue_enqueue(eventq_handle, sw_event);
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if (error != -ENOBUFS) {
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/* We were able to successfully send the event
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or had a real failure. return the status*/
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break;
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}
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/* Wait for the queue to be not full and try again*/
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udelay(1);
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}
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return error;
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}
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