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 #define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ) 30 31 struct IRQState { 32 Object parent_obj; 33 34 qemu_irq_handler handler; 35 void *opaque; 36 int n; 37 }; 38 39 void qemu_set_irq(qemu_irq irq, int level) 40 { 41 if (!irq) 42 return; 43 44 irq->handler(irq->opaque, irq->n, level); 45 } 46 47 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler, 48 void *opaque, int n) 49 { 50 qemu_irq *s; 51 int i; 52 53 if (!old) { 54 n_old = 0; 55 } 56 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n); 57 for (i = n_old; i < n + n_old; i++) { 58 s[i] = qemu_allocate_irq(handler, opaque, i); 59 } 60 return s; 61 } 62 63 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n) 64 { 65 return qemu_extend_irqs(NULL, 0, handler, opaque, n); 66 } 67 68 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n) 69 { 70 struct IRQState *irq; 71 72 irq = IRQ(object_new(TYPE_IRQ)); 73 irq->handler = handler; 74 irq->opaque = opaque; 75 irq->n = n; 76 77 return irq; 78 } 79 80 void qemu_free_irqs(qemu_irq *s, int n) 81 { 82 int i; 83 for (i = 0; i < n; i++) { 84 qemu_free_irq(s[i]); 85 } 86 g_free(s); 87 } 88 89 void qemu_free_irq(qemu_irq irq) 90 { 91 object_unref(OBJECT(irq)); 92 } 93 94 static void qemu_notirq(void *opaque, int line, int level) 95 { 96 struct IRQState *irq = opaque; 97 98 irq->handler(irq->opaque, irq->n, !level); 99 } 100 101 qemu_irq qemu_irq_invert(qemu_irq irq) 102 { 103 /* The default state for IRQs is low, so raise the output now. */ 104 qemu_irq_raise(irq); 105 return qemu_allocate_irq(qemu_notirq, irq, 0); 106 } 107 108 static void qemu_splitirq(void *opaque, int line, int level) 109 { 110 struct IRQState **irq = opaque; 111 irq[0]->handler(irq[0]->opaque, irq[0]->n, level); 112 irq[1]->handler(irq[1]->opaque, irq[1]->n, level); 113 } 114 115 qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2) 116 { 117 qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq)); 118 s[0] = irq1; 119 s[1] = irq2; 120 return qemu_allocate_irq(qemu_splitirq, s, 0); 121 } 122 123 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n) 124 { 125 int i; 126 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n); 127 for (i = 0; i < n; i++) { 128 *old_irqs[i] = *gpio_in[i]; 129 gpio_in[i]->handler = handler; 130 gpio_in[i]->opaque = &old_irqs[i]; 131 } 132 } 133 134 static const TypeInfo irq_type_info = { 135 .name = TYPE_IRQ, 136 .parent = TYPE_OBJECT, 137 .instance_size = sizeof(struct IRQState), 138 }; 139 140 static void irq_register_types(void) 141 { 142 type_register_static(&irq_type_info); 143 } 144 145 type_init(irq_register_types) 146