1 /* 2 * QEMU IRQ/GPIO common code. 3 * 4 * Copyright (c) 2007 CodeSourcery. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 #include "qemu/osdep.h" 25 #include "qemu/main-loop.h" 26 #include "hw/irq.h" 27 #include "qom/object.h" 28 29 void qemu_set_irq(qemu_irq irq, int level) 30 { 31 if (!irq) 32 return; 33 34 irq->handler(irq->opaque, irq->n, level); 35 } 36 37 void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque, 38 int n) 39 { 40 object_initialize(irq, sizeof(*irq), TYPE_IRQ); 41 irq->handler = handler; 42 irq->opaque = opaque; 43 irq->n = n; 44 } 45 46 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler, 47 void *opaque, int n) 48 { 49 qemu_irq *s; 50 int i; 51 52 if (!old) { 53 n_old = 0; 54 } 55 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n); 56 for (i = n_old; i < n + n_old; i++) { 57 s[i] = qemu_allocate_irq(handler, opaque, i); 58 } 59 return s; 60 } 61 62 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n) 63 { 64 return qemu_extend_irqs(NULL, 0, handler, opaque, n); 65 } 66 67 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n) 68 { 69 IRQState *irq; 70 71 irq = g_new(IRQState, 1); 72 qemu_init_irq(irq, handler, opaque, n); 73 74 return irq; 75 } 76 77 void qemu_free_irqs(qemu_irq *s, int n) 78 { 79 int i; 80 for (i = 0; i < n; i++) { 81 qemu_free_irq(s[i]); 82 } 83 g_free(s); 84 } 85 86 void qemu_free_irq(qemu_irq irq) 87 { 88 object_unref(OBJECT(irq)); 89 } 90 91 static void qemu_notirq(void *opaque, int line, int level) 92 { 93 IRQState *irq = opaque; 94 95 irq->handler(irq->opaque, irq->n, !level); 96 } 97 98 qemu_irq qemu_irq_invert(qemu_irq irq) 99 { 100 /* The default state for IRQs is low, so raise the output now. */ 101 qemu_irq_raise(irq); 102 return qemu_allocate_irq(qemu_notirq, irq, 0); 103 } 104 105 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n) 106 { 107 int i; 108 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n); 109 for (i = 0; i < n; i++) { 110 *old_irqs[i] = *gpio_in[i]; 111 gpio_in[i]->handler = handler; 112 gpio_in[i]->opaque = &old_irqs[i]; 113 } 114 } 115 116 static const TypeInfo irq_type_info = { 117 .name = TYPE_IRQ, 118 .parent = TYPE_OBJECT, 119 .instance_size = sizeof(IRQState), 120 }; 121 122 static void irq_register_types(void) 123 { 124 type_register_static(&irq_type_info); 125 } 126 127 type_init(irq_register_types) 128