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 "qemu-common.h" 27 #include "hw/irq.h" 28 #include "qom/object.h" 29 30 #define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ) 31 32 struct IRQState { 33 Object parent_obj; 34 35 qemu_irq_handler handler; 36 void *opaque; 37 int n; 38 }; 39 40 void qemu_set_irq(qemu_irq irq, int level) 41 { 42 if (!irq) 43 return; 44 45 irq->handler(irq->opaque, irq->n, level); 46 } 47 48 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler, 49 void *opaque, int n) 50 { 51 qemu_irq *s; 52 int i; 53 54 if (!old) { 55 n_old = 0; 56 } 57 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n); 58 for (i = n_old; i < n + n_old; i++) { 59 s[i] = qemu_allocate_irq(handler, opaque, i); 60 } 61 return s; 62 } 63 64 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n) 65 { 66 return qemu_extend_irqs(NULL, 0, handler, opaque, n); 67 } 68 69 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n) 70 { 71 struct IRQState *irq; 72 73 irq = IRQ(object_new(TYPE_IRQ)); 74 irq->handler = handler; 75 irq->opaque = opaque; 76 irq->n = n; 77 78 return irq; 79 } 80 81 void qemu_free_irqs(qemu_irq *s, int n) 82 { 83 int i; 84 for (i = 0; i < n; i++) { 85 qemu_free_irq(s[i]); 86 } 87 g_free(s); 88 } 89 90 void qemu_free_irq(qemu_irq irq) 91 { 92 object_unref(OBJECT(irq)); 93 } 94 95 static void qemu_notirq(void *opaque, int line, int level) 96 { 97 struct IRQState *irq = opaque; 98 99 irq->handler(irq->opaque, irq->n, !level); 100 } 101 102 qemu_irq qemu_irq_invert(qemu_irq irq) 103 { 104 /* The default state for IRQs is low, so raise the output now. */ 105 qemu_irq_raise(irq); 106 return qemu_allocate_irq(qemu_notirq, irq, 0); 107 } 108 109 static void qemu_splitirq(void *opaque, int line, int level) 110 { 111 struct IRQState **irq = opaque; 112 irq[0]->handler(irq[0]->opaque, irq[0]->n, level); 113 irq[1]->handler(irq[1]->opaque, irq[1]->n, level); 114 } 115 116 qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2) 117 { 118 qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq)); 119 s[0] = irq1; 120 s[1] = irq2; 121 return qemu_allocate_irq(qemu_splitirq, s, 0); 122 } 123 124 static void proxy_irq_handler(void *opaque, int n, int level) 125 { 126 qemu_irq **target = opaque; 127 128 if (*target) { 129 qemu_set_irq((*target)[n], level); 130 } 131 } 132 133 qemu_irq *qemu_irq_proxy(qemu_irq **target, int n) 134 { 135 return qemu_allocate_irqs(proxy_irq_handler, target, n); 136 } 137 138 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n) 139 { 140 int i; 141 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n); 142 for (i = 0; i < n; i++) { 143 *old_irqs[i] = *gpio_in[i]; 144 gpio_in[i]->handler = handler; 145 gpio_in[i]->opaque = &old_irqs[i]; 146 } 147 } 148 149 static const TypeInfo irq_type_info = { 150 .name = TYPE_IRQ, 151 .parent = TYPE_OBJECT, 152 .instance_size = sizeof(struct IRQState), 153 }; 154 155 static void irq_register_types(void) 156 { 157 type_register_static(&irq_type_info); 158 } 159 160 type_init(irq_register_types) 161