xref: /openbmc/qemu/hw/isa/i82378.c (revision 36f96c4b)
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 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 "hw/pci/pci.h"
21 #include "hw/i386/pc.h"
22 #include "hw/timer/i8254.h"
23 #include "hw/audio/pcspk.h"
24 
25 #define TYPE_I82378 "i82378"
26 #define I82378(obj) \
27     OBJECT_CHECK(I82378State, (obj), TYPE_I82378)
28 
29 typedef struct I82378State {
30     PCIDevice parent_obj;
31 
32     qemu_irq out[2];
33     qemu_irq *i8259;
34     MemoryRegion io;
35 } I82378State;
36 
37 static const VMStateDescription vmstate_i82378 = {
38     .name = "pci-i82378",
39     .version_id = 0,
40     .minimum_version_id = 0,
41     .fields = (VMStateField[]) {
42         VMSTATE_PCI_DEVICE(parent_obj, I82378State),
43         VMSTATE_END_OF_LIST()
44     },
45 };
46 
47 static void i82378_request_out0_irq(void *opaque, int irq, int level)
48 {
49     I82378State *s = opaque;
50     qemu_set_irq(s->out[0], level);
51 }
52 
53 static void i82378_request_pic_irq(void *opaque, int irq, int level)
54 {
55     DeviceState *dev = opaque;
56     I82378State *s = I82378(dev);
57 
58     qemu_set_irq(s->i8259[irq], level);
59 }
60 
61 static void i82378_realize(PCIDevice *pci, Error **errp)
62 {
63     DeviceState *dev = DEVICE(pci);
64     I82378State *s = I82378(dev);
65     uint8_t *pci_conf;
66     ISABus *isabus;
67     ISADevice *isa;
68 
69     pci_conf = pci->config;
70     pci_set_word(pci_conf + PCI_COMMAND,
71                  PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
72     pci_set_word(pci_conf + PCI_STATUS,
73                  PCI_STATUS_DEVSEL_MEDIUM);
74 
75     pci_config_set_interrupt_pin(pci_conf, 1); /* interrupt pin 0 */
76 
77     isabus = isa_bus_new(dev, get_system_memory(),
78                          pci_address_space_io(pci), errp);
79     if (!isabus) {
80         return;
81     }
82 
83     /* This device has:
84        2 82C59 (irq)
85        1 82C54 (pit)
86        2 82C37 (dma)
87        NMI
88        Utility Bus Support Registers
89 
90        All devices accept byte access only, except timer
91      */
92 
93     /* 2 82C59 (irq) */
94     s->i8259 = i8259_init(isabus,
95                           qemu_allocate_irq(i82378_request_out0_irq, s, 0));
96     isa_bus_irqs(isabus, s->i8259);
97 
98     /* 1 82C54 (pit) */
99     isa = pit_init(isabus, 0x40, 0, NULL);
100 
101     /* speaker */
102     pcspk_init(isabus, isa);
103 
104     /* 2 82C37 (dma) */
105     isa = isa_create_simple(isabus, "i82374");
106 
107     /* timer */
108     isa_create_simple(isabus, "mc146818rtc");
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 };
141 
142 static void i82378_register_types(void)
143 {
144     type_register_static(&i82378_type_info);
145 }
146 
147 type_init(i82378_register_types)
148