xref: /openbmc/qemu/hw/isa/i82378.c (revision a6caeee8) 
1 /*
2  * QEMU Intel i82378 emulation (PCI to ISA bridge)
3  *
4  * Copyright (c) 2010-2011 Hervé Poussineau
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 <http://www.gnu.org/licenses/>.
18  */
19 
20 #include "qemu/osdep.h"
21 #include "hw/pci/pci.h"
22 #include "hw/irq.h"
23 #include "hw/intc/i8259.h"
24 #include "hw/timer/i8254.h"
25 #include "migration/vmstate.h"
26 #include "hw/audio/pcspk.h"
27 #include "qom/object.h"
28 
29 #define TYPE_I82378 "i82378"
30 OBJECT_DECLARE_SIMPLE_TYPE(I82378State, I82378)
31 
32 struct I82378State {
33     PCIDevice parent_obj;
34 
35     qemu_irq out[2];
36     qemu_irq *i8259;
37     MemoryRegion io;
38 };
39 
40 static const VMStateDescription vmstate_i82378 = {
41     .name = "pci-i82378",
42     .version_id = 0,
43     .minimum_version_id = 0,
44     .fields = (VMStateField[]) {
45         VMSTATE_PCI_DEVICE(parent_obj, I82378State),
46         VMSTATE_END_OF_LIST()
47     },
48 };
49 
50 static void i82378_request_out0_irq(void *opaque, int irq, int level)
51 {
52     I82378State *s = opaque;
53     qemu_set_irq(s->out[0], level);
54 }
55 
56 static void i82378_request_pic_irq(void *opaque, int irq, int level)
57 {
58     DeviceState *dev = opaque;
59     I82378State *s = I82378(dev);
60 
61     qemu_set_irq(s->i8259[irq], level);
62 }
63 
64 static void i82378_realize(PCIDevice *pci, Error **errp)
65 {
66     DeviceState *dev = DEVICE(pci);
67     I82378State *s = I82378(dev);
68     uint8_t *pci_conf;
69     ISABus *isabus;
70     ISADevice *pit;
71 
72     pci_conf = pci->config;
73     pci_set_word(pci_conf + PCI_COMMAND,
74                  PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
75     pci_set_word(pci_conf + PCI_STATUS,
76                  PCI_STATUS_DEVSEL_MEDIUM);
77 
78     pci_config_set_interrupt_pin(pci_conf, 1); /* interrupt pin 0 */
79 
80     isabus = isa_bus_new(dev, get_system_memory(),
81                          pci_address_space_io(pci), errp);
82     if (!isabus) {
83         return;
84     }
85 
86     /* This device has:
87        2 82C59 (irq)
88        1 82C54 (pit)
89        2 82C37 (dma)
90        NMI
91        Utility Bus Support Registers
92 
93        All devices accept byte access only, except timer
94      */
95 
96     /* 2 82C59 (irq) */
97     s->i8259 = i8259_init(isabus,
98                           qemu_allocate_irq(i82378_request_out0_irq, s, 0));
99     isa_bus_irqs(isabus, s->i8259);
100 
101     /* 1 82C54 (pit) */
102     pit = i8254_pit_init(isabus, 0x40, 0, NULL);
103 
104     /* speaker */
105     pcspk_init(isa_new(TYPE_PC_SPEAKER), isabus, pit);
106 
107     /* 2 82C37 (dma) */
108     isa_create_simple(isabus, "i82374");
109 }
110 
111 static void i82378_init(Object *obj)
112 {
113     DeviceState *dev = DEVICE(obj);
114     I82378State *s = I82378(obj);
115 
116     qdev_init_gpio_out(dev, s->out, 1);
117     qdev_init_gpio_in(dev, i82378_request_pic_irq, 16);
118 }
119 
120 static void i82378_class_init(ObjectClass *klass, void *data)
121 {
122     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
123     DeviceClass *dc = DEVICE_CLASS(klass);
124 
125     k->realize = i82378_realize;
126     k->vendor_id = PCI_VENDOR_ID_INTEL;
127     k->device_id = PCI_DEVICE_ID_INTEL_82378;
128     k->revision = 0x03;
129     k->class_id = PCI_CLASS_BRIDGE_ISA;
130     dc->vmsd = &vmstate_i82378;
131     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
132 }
133 
134 static const TypeInfo i82378_type_info = {
135     .name = TYPE_I82378,
136     .parent = TYPE_PCI_DEVICE,
137     .instance_size = sizeof(I82378State),
138     .instance_init = i82378_init,
139     .class_init = i82378_class_init,
140     .interfaces = (InterfaceInfo[]) {
141         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
142         { },
143     },
144 };
145 
146 static void i82378_register_types(void)
147 {
148     type_register_static(&i82378_type_info);
149 }
150 
151 type_init(i82378_register_types)
152