1 | /* |
2 | * QEMU Altera Internal Interrupt Controller. |
3 | * |
4 | * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com> |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2.1 of the License, or (at your option) any later version. |
10 | * |
11 | * This library is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, see |
18 | * <http://www.gnu.org/licenses/lgpl-2.1.html> |
19 | */ |
20 | |
21 | #include "qemu/osdep.h" |
22 | #include "qemu/module.h" |
23 | #include "qapi/error.h" |
24 | |
25 | #include "hw/irq.h" |
26 | #include "hw/sysbus.h" |
27 | #include "cpu.h" |
28 | |
29 | #define TYPE_ALTERA_IIC "altera,iic" |
30 | #define ALTERA_IIC(obj) \ |
31 | OBJECT_CHECK(AlteraIIC, (obj), TYPE_ALTERA_IIC) |
32 | |
33 | typedef struct AlteraIIC { |
34 | SysBusDevice parent_obj; |
35 | void *cpu; |
36 | qemu_irq parent_irq; |
37 | } AlteraIIC; |
38 | |
39 | static void update_irq(AlteraIIC *pv) |
40 | { |
41 | CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env; |
42 | |
43 | qemu_set_irq(pv->parent_irq, |
44 | env->regs[CR_IPENDING] & env->regs[CR_IENABLE]); |
45 | } |
46 | |
47 | static void irq_handler(void *opaque, int irq, int level) |
48 | { |
49 | AlteraIIC *pv = opaque; |
50 | CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env; |
51 | |
52 | env->regs[CR_IPENDING] &= ~(1 << irq); |
53 | env->regs[CR_IPENDING] |= !!level << irq; |
54 | |
55 | update_irq(pv); |
56 | } |
57 | |
58 | static void altera_iic_init(Object *obj) |
59 | { |
60 | AlteraIIC *pv = ALTERA_IIC(obj); |
61 | |
62 | qdev_init_gpio_in(DEVICE(pv), irq_handler, 32); |
63 | sysbus_init_irq(SYS_BUS_DEVICE(obj), &pv->parent_irq); |
64 | } |
65 | |
66 | static void altera_iic_realize(DeviceState *dev, Error **errp) |
67 | { |
68 | struct AlteraIIC *pv = ALTERA_IIC(dev); |
69 | Error *err = NULL; |
70 | |
71 | pv->cpu = object_property_get_link(OBJECT(dev), "cpu" , &err); |
72 | if (!pv->cpu) { |
73 | error_setg(errp, "altera,iic: CPU link not found: %s" , |
74 | error_get_pretty(err)); |
75 | return; |
76 | } |
77 | } |
78 | |
79 | static void altera_iic_class_init(ObjectClass *klass, void *data) |
80 | { |
81 | DeviceClass *dc = DEVICE_CLASS(klass); |
82 | |
83 | /* Reason: needs to be wired up, e.g. by nios2_10m50_ghrd_init() */ |
84 | dc->user_creatable = false; |
85 | dc->realize = altera_iic_realize; |
86 | } |
87 | |
88 | static TypeInfo altera_iic_info = { |
89 | .name = "altera,iic" , |
90 | .parent = TYPE_SYS_BUS_DEVICE, |
91 | .instance_size = sizeof(AlteraIIC), |
92 | .instance_init = altera_iic_init, |
93 | .class_init = altera_iic_class_init, |
94 | }; |
95 | |
96 | static void altera_iic_register(void) |
97 | { |
98 | type_register_static(&altera_iic_info); |
99 | } |
100 | |
101 | type_init(altera_iic_register) |
102 | |