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_device.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 cpu_intr;
36 qemu_irq *isa_irqs_in;
37 };
38
39 static const VMStateDescription vmstate_i82378 = {
40 .name = "pci-i82378",
41 .version_id = 0,
42 .minimum_version_id = 0,
43 .fields = (const VMStateField[]) {
44 VMSTATE_PCI_DEVICE(parent_obj, I82378State),
45 VMSTATE_END_OF_LIST()
46 },
47 };
48
i82378_request_out0_irq(void * opaque,int irq,int level)49 static void i82378_request_out0_irq(void *opaque, int irq, int level)
50 {
51 I82378State *s = opaque;
52 qemu_set_irq(s->cpu_intr, level);
53 }
54
i82378_request_pic_irq(void * opaque,int irq,int level)55 static void i82378_request_pic_irq(void *opaque, int irq, int level)
56 {
57 DeviceState *dev = opaque;
58 I82378State *s = I82378(dev);
59
60 qemu_set_irq(s->isa_irqs_in[irq], level);
61 }
62
i82378_realize(PCIDevice * pci,Error ** errp)63 static void i82378_realize(PCIDevice *pci, Error **errp)
64 {
65 DeviceState *dev = DEVICE(pci);
66 I82378State *s = I82378(dev);
67 uint8_t *pci_conf;
68 ISABus *isabus;
69 ISADevice *pit;
70 ISADevice *pcspk;
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->isa_irqs_in = i8259_init(isabus,
98 qemu_allocate_irq(i82378_request_out0_irq,
99 s, 0));
100 isa_bus_register_input_irqs(isabus, s->isa_irqs_in);
101
102 /* 1 82C54 (pit) */
103 pit = i8254_pit_init(isabus, 0x40, 0, NULL);
104
105 /* speaker */
106 pcspk = isa_new(TYPE_PC_SPEAKER);
107 object_property_set_link(OBJECT(pcspk), "pit", OBJECT(pit), &error_fatal);
108 if (!isa_realize_and_unref(pcspk, isabus, errp)) {
109 return;
110 }
111
112 /* 2 82C37 (dma) */
113 isa_create_simple(isabus, "i82374");
114 }
115
i82378_init(Object * obj)116 static void i82378_init(Object *obj)
117 {
118 DeviceState *dev = DEVICE(obj);
119 I82378State *s = I82378(obj);
120
121 qdev_init_gpio_out(dev, &s->cpu_intr, 1);
122 qdev_init_gpio_in(dev, i82378_request_pic_irq, 16);
123 }
124
i82378_class_init(ObjectClass * klass,void * data)125 static void i82378_class_init(ObjectClass *klass, void *data)
126 {
127 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
128 DeviceClass *dc = DEVICE_CLASS(klass);
129
130 k->realize = i82378_realize;
131 k->vendor_id = PCI_VENDOR_ID_INTEL;
132 k->device_id = PCI_DEVICE_ID_INTEL_82378;
133 k->revision = 0x03;
134 k->class_id = PCI_CLASS_BRIDGE_ISA;
135 dc->vmsd = &vmstate_i82378;
136 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
137 }
138
139 static const TypeInfo i82378_type_info = {
140 .name = TYPE_I82378,
141 .parent = TYPE_PCI_DEVICE,
142 .instance_size = sizeof(I82378State),
143 .instance_init = i82378_init,
144 .class_init = i82378_class_init,
145 .interfaces = (InterfaceInfo[]) {
146 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
147 { },
148 },
149 };
150
i82378_register_types(void)151 static void i82378_register_types(void)
152 {
153 type_register_static(&i82378_type_info);
154 }
155
156 type_init(i82378_register_types)
157