1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef __ISR_H
18 #define __ISR_H
19
20 #include <stdbool.h>
21 #include <stdint.h>
22
23 #include <cpu.h>
24 #include <list.h>
25 #include <util.h>
26 #include <seos.h>
27
28 struct ChainedInterrupt {
29 link_t isrs;
30
31 void (*const enable)(struct ChainedInterrupt *);
32 void (*const disable)(struct ChainedInterrupt *);
33 };
34
35 struct ChainedIsr {
36 link_t node;
37
38 uint32_t maxLatencyNs;
39
40 bool (*func)(struct ChainedIsr *);
41 uint16_t tid;
42 };
43
chainIsr(struct ChainedInterrupt * interrupt,struct ChainedIsr * isr)44 static inline void chainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
45 {
46 interrupt->disable(interrupt);
47 isr->tid = osGetCurrentTid();
48 list_add_tail(&interrupt->isrs, &isr->node);
49 interrupt->enable(interrupt);
50 }
51
unchainIsr(struct ChainedInterrupt * interrupt,struct ChainedIsr * isr)52 static inline void unchainIsr(struct ChainedInterrupt *interrupt, struct ChainedIsr *isr)
53 {
54 interrupt->disable(interrupt);
55 isr->tid = 0;
56 list_delete(&isr->node);
57 if (!list_is_empty(&interrupt->isrs))
58 interrupt->enable(interrupt);
59 }
60
dispatchIsr(struct ChainedInterrupt * interrupt)61 static inline bool dispatchIsr(struct ChainedInterrupt *interrupt)
62 {
63 struct link_t *cur, *tmp;
64 bool handled = false;
65 uint16_t oldTid = osGetCurrentTid();
66
67 list_iterate(&interrupt->isrs, cur, tmp) {
68 struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
69 osSetCurrentTid(curIsr->tid);
70 handled = curIsr->func(curIsr);
71 if (handled)
72 break;
73 }
74 osSetCurrentTid(oldTid);
75
76 return handled;
77 }
78
unchainIsrAll(struct ChainedInterrupt * interrupt,uint32_t tid)79 static inline int unchainIsrAll(struct ChainedInterrupt *interrupt, uint32_t tid)
80 {
81 int count = 0;
82 struct link_t *cur, *tmp;
83
84 list_iterate(&interrupt->isrs, cur, tmp) {
85 struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
86 if (curIsr->tid == tid) {
87 unchainIsr(interrupt, curIsr);
88 count++;
89 }
90 }
91
92 return count;
93 }
94
maxLatencyIsr(struct ChainedInterrupt * interrupt)95 static inline uint32_t maxLatencyIsr(struct ChainedInterrupt *interrupt)
96 {
97 struct link_t *cur, *tmp;
98 uint32_t latency = 0;
99
100 list_iterate(&interrupt->isrs, cur, tmp) {
101 struct ChainedIsr *curIsr = container_of(cur, struct ChainedIsr, node);
102 if (!latency || (curIsr->maxLatencyNs && curIsr->maxLatencyNs < latency))
103 latency = curIsr->maxLatencyNs;
104 }
105
106 return latency;
107 }
108
109 #endif /* __ISR_H */
110