1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Support for Intel Camera Imaging ISP subsystem.
4 * Copyright (c) 2015, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13 * more details.
14 */
15
16#include "ia_css_types.h"
17#include "assert_support.h"
18#include "ia_css_queue.h" /* sp2host_dequeue_irq_event() */
19#include "ia_css_eventq.h"
20#include "ia_css_event.h"	/* ia_css_event_encode()
21				ia_css_event_decode()
22				*/
23int ia_css_eventq_recv(
24    ia_css_queue_t *eventq_handle,
25    uint8_t *payload)
26{
27	u32 sp_event;
28	int error;
29
30	/* dequeue the IRQ event */
31	error = ia_css_queue_dequeue(eventq_handle, &sp_event);
32
33	/* check whether the IRQ event is available or not */
34	if (!error)
35		ia_css_event_decode(sp_event, payload);
36	return error;
37}
38
39/*
40 * @brief The Host sends the event to the SP.
41 * Refer to "sh_css_sp.h" for details.
42 */
43int ia_css_eventq_send(
44    ia_css_queue_t *eventq_handle,
45    u8 evt_id,
46    u8 evt_payload_0,
47    u8 evt_payload_1,
48    uint8_t evt_payload_2)
49{
50	u8 tmp[4];
51	u32 sw_event;
52	int error = -ENOSYS;
53
54	/*
55	 * Encode the queue type, the thread ID and
56	 * the queue ID into the event.
57	 */
58	tmp[0] = evt_id;
59	tmp[1] = evt_payload_0;
60	tmp[2] = evt_payload_1;
61	tmp[3] = evt_payload_2;
62	ia_css_event_encode(tmp, 4, &sw_event);
63
64	/* queue the software event (busy-waiting) */
65	for ( ; ; ) {
66		error = ia_css_queue_enqueue(eventq_handle, sw_event);
67		if (error != -ENOBUFS) {
68			/* We were able to successfully send the event
69			   or had a real failure. return the status*/
70			break;
71		}
72		/* Wait for the queue to be not full and try again*/
73		udelay(1);
74	}
75	return error;
76}
77