fdt_intr.c revision 1.2 1 /* $NetBSD: fdt_intr.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: fdt_intr.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34 #include <sys/kmem.h>
35
36 #include <libfdt.h>
37 #include <dev/fdt/fdtvar.h>
38
39 struct fdtbus_interrupt_controller {
40 device_t ic_dev;
41 int ic_phandle;
42 const struct fdtbus_interrupt_controller_func *ic_funcs;
43
44 struct fdtbus_interrupt_controller *ic_next;
45 };
46
47 static struct fdtbus_interrupt_controller *fdtbus_ic = NULL;
48
49 static int
50 fdtbus_get_interrupt_parent(int phandle)
51 {
52 u_int interrupt_parent;
53 int len;
54
55 while (phandle >= 0) {
56 len = OF_getprop(phandle, "interrupt-parent",
57 &interrupt_parent, sizeof(interrupt_parent));
58 if (len == sizeof(interrupt_parent)) {
59 break;
60 }
61 if (phandle == 0) {
62 return -1;
63 }
64 phandle = OF_parent(phandle);
65 }
66 if (phandle < 0) {
67 return -1;
68 }
69
70 interrupt_parent = fdt32_to_cpu(interrupt_parent);
71
72 const void *data = fdtbus_get_data();
73 const int off = fdt_node_offset_by_phandle(data, interrupt_parent);
74 if (off < 0) {
75 return -1;
76 }
77
78 return fdtbus_offset2phandle(off);
79 }
80
81 static struct fdtbus_interrupt_controller *
82 fdtbus_get_interrupt_controller(int phandle)
83 {
84 struct fdtbus_interrupt_controller *ic;
85
86 const int ic_phandle = fdtbus_get_interrupt_parent(phandle);
87 if (ic_phandle < 0) {
88 return NULL;
89 }
90
91 for (ic = fdtbus_ic; ic; ic = ic->ic_next) {
92 if (ic->ic_phandle == ic_phandle) {
93 return ic;
94 }
95 }
96
97 return NULL;
98 }
99
100 int
101 fdtbus_register_interrupt_controller(device_t dev, int phandle,
102 const struct fdtbus_interrupt_controller_func *funcs)
103 {
104 struct fdtbus_interrupt_controller *ic;
105
106 ic = kmem_alloc(sizeof(*ic), KM_SLEEP);
107 ic->ic_dev = dev;
108 ic->ic_phandle = phandle;
109 ic->ic_funcs = funcs;
110
111 ic->ic_next = fdtbus_ic;
112 fdtbus_ic = ic;
113
114 return 0;
115 }
116
117 void *
118 fdtbus_intr_establish(int phandle, u_int index, int ipl, int flags,
119 int (*func)(void *), void *arg)
120 {
121 struct fdtbus_interrupt_controller *ic;
122
123 ic = fdtbus_get_interrupt_controller(phandle);
124 if (ic == NULL)
125 return NULL;
126
127 return ic->ic_funcs->establish(ic->ic_dev, phandle, index, ipl,
128 flags, func, arg);
129 }
130
131 void
132 fdtbus_intr_disestablish(int phandle, void *ih)
133 {
134 struct fdtbus_interrupt_controller *ic;
135
136 ic = fdtbus_get_interrupt_controller(phandle);
137 KASSERT(ic != NULL);
138
139 return ic->ic_funcs->disestablish(ic->ic_dev, ih);
140 }
141
142 bool
143 fdtbus_intr_str(int phandle, u_int index, char *buf, size_t buflen)
144 {
145 struct fdtbus_interrupt_controller *ic;
146
147 ic = fdtbus_get_interrupt_controller(phandle);
148 if (ic == NULL)
149 return false;
150
151 return ic->ic_funcs->intrstr(ic->ic_dev, phandle, index, buf, buflen);
152 }
153