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      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 
     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 
     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 
     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 
     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 
     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