1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/*
* QEMU Altera Internal Interrupt Controller.
*
* Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "hw/sysbus.h"
#include "cpu.h"
#define TYPE_ALTERA_IIC "altera,iic"
#define ALTERA_IIC(obj) \
OBJECT_CHECK(AlteraIIC, (obj), TYPE_ALTERA_IIC)
typedef struct AlteraIIC {
SysBusDevice parent_obj;
void *cpu;
qemu_irq parent_irq;
} AlteraIIC;
static void update_irq(AlteraIIC *pv)
{
CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env;
qemu_set_irq(pv->parent_irq,
env->regs[CR_IPENDING] & env->regs[CR_IENABLE]);
}
static void irq_handler(void *opaque, int irq, int level)
{
AlteraIIC *pv = opaque;
CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env;
env->regs[CR_IPENDING] &= ~(1 << irq);
env->regs[CR_IPENDING] |= !!level << irq;
update_irq(pv);
}
static void altera_iic_init(Object *obj)
{
AlteraIIC *pv = ALTERA_IIC(obj);
qdev_init_gpio_in(DEVICE(pv), irq_handler, 32);
sysbus_init_irq(SYS_BUS_DEVICE(obj), &pv->parent_irq);
}
static Property altera_iic_properties[] = {
DEFINE_PROP_PTR("cpu", AlteraIIC, cpu),
DEFINE_PROP_END_OF_LIST(),
};
static void altera_iic_realize(DeviceState *dev, Error **errp)
{
struct AlteraIIC *pv = ALTERA_IIC(dev);
if (!pv->cpu) {
error_setg(errp, "altera,iic: CPU not connected");
return;
}
}
static void altera_iic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = altera_iic_properties;
/* Reason: pointer property "cpu" */
dc->cannot_instantiate_with_device_add_yet = true;
dc->realize = altera_iic_realize;
}
static TypeInfo altera_iic_info = {
.name = "altera,iic",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AlteraIIC),
.instance_init = altera_iic_init,
.class_init = altera_iic_class_init,
};
static void altera_iic_register(void)
{
type_register_static(&altera_iic_info);
}
type_init(altera_iic_register)
|
