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 27 struct IRQState { 28 qemu_irq_handler handler; 29 void *opaque; 30 int n; 31 }; 32 33 void qemu_set_irq(qemu_irq irq, int level) 34 { 35 if (!irq) 36 return; 37 38 irq->handler(irq->opaque, irq->n, level); 39 } 40 41 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler, 42 void *opaque, int n) 43 { 44 qemu_irq *s; 45 struct IRQState *p; 46 int i; 47 48 if (!old) { 49 n_old = 0; 50 } 51 s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n); 52 p = old ? g_renew(struct IRQState, s[0], n + n_old) : 53 g_new(struct IRQState, n); 54 for (i = 0; i < n + n_old; i++) { 55 if (i >= n_old) { 56 p->handler = handler; 57 p->opaque = opaque; 58 p->n = i; 59 } 60 s[i] = p; 61 p++; 62 } 63 return s; 64 } 65 66 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n) 67 { 68 return qemu_extend_irqs(NULL, 0, handler, opaque, n); 69 } 70 71 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n) 72 { 73 struct IRQState *irq; 74 75 irq = g_new(struct IRQState, 1); 76 irq->handler = handler; 77 irq->opaque = opaque; 78 irq->n = n; 79 80 return irq; 81 } 82 83 void qemu_free_irqs(qemu_irq *s) 84 { 85 g_free(s[0]); 86 g_free(s); 87 } 88 89 void qemu_free_irq(qemu_irq irq) 90 { 91 g_free(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_irqs(qemu_notirq, irq, 1)[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_irqs(qemu_splitirq, s, 1)[0]; 121 } 122 123 static void proxy_irq_handler(void *opaque, int n, int level) 124 { 125 qemu_irq **target = opaque; 126 127 if (*target) { 128 qemu_set_irq((*target)[n], level); 129 } 130 } 131 132 qemu_irq *qemu_irq_proxy(qemu_irq **target, int n) 133 { 134 return qemu_allocate_irqs(proxy_irq_handler, target, n); 135 } 136 137 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n) 138 { 139 int i; 140 qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n); 141 for (i = 0; i < n; i++) { 142 *old_irqs[i] = *gpio_in[i]; 143 gpio_in[i]->handler = handler; 144 gpio_in[i]->opaque = old_irqs; 145 } 146 } 147 148 void qemu_irq_intercept_out(qemu_irq **gpio_out, qemu_irq_handler handler, int n) 149 { 150 qemu_irq *old_irqs = *gpio_out; 151 *gpio_out = qemu_allocate_irqs(handler, old_irqs, n); 152 } 153