xref: /openbmc/qemu/include/hw/irq.h (revision 0ebfc997)
1 #ifndef QEMU_IRQ_H
2 #define QEMU_IRQ_H
3 
4 /* Generic IRQ/GPIO pin infrastructure.  */
5 
6 #define TYPE_IRQ "irq"
7 
8 void qemu_set_irq(qemu_irq irq, int level);
9 
qemu_irq_raise(qemu_irq irq)10 static inline void qemu_irq_raise(qemu_irq irq)
11 {
12     qemu_set_irq(irq, 1);
13 }
14 
qemu_irq_lower(qemu_irq irq)15 static inline void qemu_irq_lower(qemu_irq irq)
16 {
17     qemu_set_irq(irq, 0);
18 }
19 
qemu_irq_pulse(qemu_irq irq)20 static inline void qemu_irq_pulse(qemu_irq irq)
21 {
22     qemu_set_irq(irq, 1);
23     qemu_set_irq(irq, 0);
24 }
25 
26 /* Returns an array of N IRQs. Each IRQ is assigned the argument handler and
27  * opaque data.
28  */
29 qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n);
30 
31 /*
32  * Allocates a single IRQ. The irq is assigned with a handler, an opaque
33  * data and the interrupt number.
34  */
35 qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n);
36 
37 /* Extends an Array of IRQs. Old IRQs have their handlers and opaque data
38  * preserved. New IRQs are assigned the argument handler and opaque data.
39  */
40 qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
41                                 void *opaque, int n);
42 
43 void qemu_free_irqs(qemu_irq *s, int n);
44 void qemu_free_irq(qemu_irq irq);
45 
46 /* Returns a new IRQ with opposite polarity.  */
47 qemu_irq qemu_irq_invert(qemu_irq irq);
48 
49 /* For internal use in qtest.  Similar to qemu_irq_split, but operating
50    on an existing vector of qemu_irq.  */
51 void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n);
52 
53 /**
54  * qemu_irq_is_connected: Return true if IRQ line is wired up
55  *
56  * If a qemu_irq has a device on the other (receiving) end of it,
57  * return true; otherwise return false.
58  *
59  * Usually device models don't need to care whether the machine model
60  * has wired up their outbound qemu_irq lines, because functions like
61  * qemu_set_irq() silently do nothing if there is nothing on the other
62  * end of the line. However occasionally a device model will want to
63  * provide default behaviour if its output is left floating, and
64  * it can use this function to identify when that is the case.
65  */
qemu_irq_is_connected(qemu_irq irq)66 static inline bool qemu_irq_is_connected(qemu_irq irq)
67 {
68     return irq != NULL;
69 }
70 
71 #endif
72