1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Support for Intel Camera Imaging ISP subsystem.
4 * Copyright (c) 2015, Intel Corporation.
5 */
6
7 #include "ia_css_types.h"
8 #include "assert_support.h"
9 #include "ia_css_queue.h" /* sp2host_dequeue_irq_event() */
10 #include "ia_css_eventq.h"
11 #include "ia_css_event.h" /* ia_css_event_encode()
12 ia_css_event_decode()
13 */
ia_css_eventq_recv(ia_css_queue_t * eventq_handle,uint8_t * payload)14 int ia_css_eventq_recv(
15 ia_css_queue_t *eventq_handle,
16 uint8_t *payload)
17 {
18 u32 sp_event;
19 int error;
20
21 /* dequeue the IRQ event */
22 error = ia_css_queue_dequeue(eventq_handle, &sp_event);
23
24 /* check whether the IRQ event is available or not */
25 if (!error)
26 ia_css_event_decode(sp_event, payload);
27 return error;
28 }
29
30 /*
31 * @brief The Host sends the event to the SP.
32 * Refer to "sh_css_sp.h" for details.
33 */
ia_css_eventq_send(ia_css_queue_t * eventq_handle,u8 evt_id,u8 evt_payload_0,u8 evt_payload_1,uint8_t evt_payload_2)34 int ia_css_eventq_send(
35 ia_css_queue_t *eventq_handle,
36 u8 evt_id,
37 u8 evt_payload_0,
38 u8 evt_payload_1,
39 uint8_t evt_payload_2)
40 {
41 u8 tmp[4];
42 u32 sw_event;
43 int error = -ENOSYS;
44
45 /*
46 * Encode the queue type, the thread ID and
47 * the queue ID into the event.
48 */
49 tmp[0] = evt_id;
50 tmp[1] = evt_payload_0;
51 tmp[2] = evt_payload_1;
52 tmp[3] = evt_payload_2;
53 ia_css_event_encode(tmp, 4, &sw_event);
54
55 /* queue the software event (busy-waiting) */
56 for ( ; ; ) {
57 error = ia_css_queue_enqueue(eventq_handle, sw_event);
58 if (error != -ENOBUFS) {
59 /* We were able to successfully send the event
60 or had a real failure. return the status*/
61 break;
62 }
63 /* Wait for the queue to be not full and try again*/
64 udelay(1);
65 }
66 return error;
67 }
68