1 /* 2 * Copyright (c) 2016, Linaro Limited 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <kernel/interrupt.h> 29 #include <trace.h> 30 31 /* 32 * NOTE! 33 * 34 * We're assuming that there's no concurrent use of this interface, except 35 * delivery of interrupts in parallel. Synchronization will be needed when 36 * we begin to modify settings after boot initialization. 37 */ 38 39 static struct itr_chip *itr_chip; 40 static SLIST_HEAD(, itr_handler) handlers = SLIST_HEAD_INITIALIZER(handlers); 41 42 void itr_init(struct itr_chip *chip) 43 { 44 itr_chip = chip; 45 } 46 47 static struct itr_handler *find_handler(size_t it) 48 { 49 struct itr_handler *h; 50 51 SLIST_FOREACH(h, &handlers, link) 52 if (h->it == it) 53 return h; 54 return NULL; 55 } 56 57 void itr_handle(size_t it) 58 { 59 struct itr_handler *h = find_handler(it); 60 61 if (!h) { 62 EMSG("Disabling unhandled interrupt %zu", it); 63 itr_chip->ops->disable(itr_chip, it); 64 return; 65 } 66 67 if (h->handler(h) != ITRR_HANDLED) { 68 EMSG("Disabling interrupt %zu not handled by handler", it); 69 itr_chip->ops->disable(itr_chip, it); 70 } 71 } 72 73 void itr_add(struct itr_handler *h) 74 { 75 itr_chip->ops->add(itr_chip, h->it, h->flags); 76 SLIST_INSERT_HEAD(&handlers, h, link); 77 } 78 79 void itr_enable(struct itr_handler *h) 80 { 81 itr_chip->ops->enable(itr_chip, h->it); 82 } 83 84 void itr_disable(struct itr_handler *h) 85 { 86 itr_chip->ops->disable(itr_chip, h->it); 87 } 88