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-common.h" 25 #include "hw/irq.h" 26 #include "qom/object.h" 27 28 #define IRQ(obj) OBJECT_CHECK(struct IRQState, (obj), TYPE_IRQ) 29 30 struct IRQState { 31 Object parent_obj; 32 33 qemu_irq_handler handler; 34 void *opaque; 35 int n; 36 }; 37 38 void qemu_set_irq(qemu_irq irq, int level) 39 { 40 if (!irq) 41 return; 42 43 irq->handler(irq->opaque, irq->n, level); 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 struct IRQState *irq; 70 71 irq = IRQ(object_new(TYPE_IRQ)); 72 irq->handler = handler; 73 irq->opaque = opaque; 74 irq->n = n; 75 76 return irq; 77 } 78 79 void qemu_free_irqs(qemu_irq *s, int n) 80 { 81 int i; 82 for (i = 0; i < n; i++) { 83 qemu_free_irq(s[i]); 84 } 85 g_free(s); 86 } 87 88 void qemu_free_irq(qemu_irq irq) 89 { 90 object_unref(OBJECT(irq)); 91 } 92 93 static void qemu_notirq(void *opaque, int line, int level) 94 { 95 struct IRQState *irq = opaque; 96 97 irq->handler(irq->opaque, irq->n, !level); 98 } 99 100 qemu_irq qemu_irq_invert(qemu_irq irq) 101 { 102 /* The default state for IRQs is low, so raise the output now. */ 103 qemu_irq_raise(irq); 104 return qemu_allocate_irq(qemu_notirq, irq, 0); 105 } 106 107 static void qemu_splitirq(void *opaque, int line, int level) 108 { 109 struct IRQState **irq = opaque; 110 irq[0]->handler(irq[0]->opaque, irq[0]->n, level); 111 irq[1]->handler(irq[1]->opaque, irq[1]->n, level); 112 } 113 114 qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2) 115 { 116 qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq)); 117 s[0] = irq1; 118 s[1] = irq2; 119 return qemu_allocate_irq(qemu_splitirq, s, 0); 120 } 121 122 static void proxy_irq_handler(void *opaque, int n, int level) 123 { 124 qemu_irq **target = opaque; 125 126 if (*target) { 127 qemu_set_irq((*target)[n], level); 128 } 129 } 130 131 qemu_irq *qemu_irq_proxy(qemu_irq **target, int n) 132 { 133 return qemu_allocate_irqs(proxy_irq_handler, target, n); 134 } 135 136 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n) 137 { 138 int i; 139 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n); 140 for (i = 0; i < n; i++) { 141 *old_irqs[i] = *gpio_in[i]; 142 gpio_in[i]->handler = handler; 143 gpio_in[i]->opaque = old_irqs; 144 } 145 } 146 147 void qemu_irq_intercept_out(qemu_irq **gpio_out, qemu_irq_handler handler, int n) 148 { 149 qemu_irq *old_irqs = *gpio_out; 150 *gpio_out = qemu_allocate_irqs(handler, old_irqs, n); 151 } 152 153 static const TypeInfo irq_type_info = { 154 .name = TYPE_IRQ, 155 .parent = TYPE_OBJECT, 156 .instance_size = sizeof(struct IRQState), 157 }; 158 159 static void irq_register_types(void) 160 { 161 type_register_static(&irq_type_info); 162 } 163 164 type_init(irq_register_types) 165