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 | 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[i]; |
145 | } |
146 | } |
147 | |
148 | static const TypeInfo irq_type_info = { |
149 | .name = TYPE_IRQ, |
150 | .parent = TYPE_OBJECT, |
151 | .instance_size = sizeof(struct IRQState), |
152 | }; |
153 | |
154 | static void irq_register_types(void) |
155 | { |
156 | type_register_static(&irq_type_info); |
157 | } |
158 | |
159 | type_init(irq_register_types) |
160 | |