xref: /openbmc/qemu/hw/isa/i82378.c (revision cbf19506)
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