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 */ 23 int 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 */ 43 int 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