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git.proxmox.com Git - mirror_qemu.git/blob - hw/intc/nios2_iic.c
2 * QEMU Altera Internal Interrupt Controller.
4 * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
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.
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.
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>
21 #include "qemu/osdep.h"
22 #include "qemu/module.h"
23 #include "qapi/error.h"
26 #include "hw/sysbus.h"
28 #include "qom/object.h"
30 #define TYPE_ALTERA_IIC "altera,iic"
31 typedef struct AlteraIIC AlteraIIC
;
32 DECLARE_INSTANCE_CHECKER(AlteraIIC
, ALTERA_IIC
,
36 SysBusDevice parent_obj
;
41 static void update_irq(AlteraIIC
*pv
)
43 CPUNios2State
*env
= &((Nios2CPU
*)(pv
->cpu
))->env
;
45 qemu_set_irq(pv
->parent_irq
,
46 env
->regs
[CR_IPENDING
] & env
->regs
[CR_IENABLE
]);
49 static void irq_handler(void *opaque
, int irq
, int level
)
51 AlteraIIC
*pv
= opaque
;
52 CPUNios2State
*env
= &((Nios2CPU
*)(pv
->cpu
))->env
;
54 env
->regs
[CR_IPENDING
] &= ~(1 << irq
);
55 env
->regs
[CR_IPENDING
] |= !!level
<< irq
;
60 static void altera_iic_init(Object
*obj
)
62 AlteraIIC
*pv
= ALTERA_IIC(obj
);
64 qdev_init_gpio_in(DEVICE(pv
), irq_handler
, 32);
65 sysbus_init_irq(SYS_BUS_DEVICE(obj
), &pv
->parent_irq
);
68 static void altera_iic_realize(DeviceState
*dev
, Error
**errp
)
70 struct AlteraIIC
*pv
= ALTERA_IIC(dev
);
72 pv
->cpu
= object_property_get_link(OBJECT(dev
), "cpu", &error_abort
);
75 static void altera_iic_class_init(ObjectClass
*klass
, void *data
)
77 DeviceClass
*dc
= DEVICE_CLASS(klass
);
79 /* Reason: needs to be wired up, e.g. by nios2_10m50_ghrd_init() */
80 dc
->user_creatable
= false;
81 dc
->realize
= altera_iic_realize
;
84 static TypeInfo altera_iic_info
= {
85 .name
= TYPE_ALTERA_IIC
,
86 .parent
= TYPE_SYS_BUS_DEVICE
,
87 .instance_size
= sizeof(AlteraIIC
),
88 .instance_init
= altera_iic_init
,
89 .class_init
= altera_iic_class_init
,
92 static void altera_iic_register(void)
94 type_register_static(&altera_iic_info
);
97 type_init(altera_iic_register
)