xref: /openbmc/qemu/hw/char/serial-isa.c (revision a719a27c)
1 /*
2  * QEMU 16550A UART emulation
3  *
4  * Copyright (c) 2003-2004 Fabrice Bellard
5  * Copyright (c) 2008 Citrix Systems, Inc.
6  *
7  * Permission is hereby granted, free of charge, to any person obtaining a copy
8  * of this software and associated documentation files (the "Software"), to deal
9  * in the Software without restriction, including without limitation the rights
10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11  * copies of the Software, and to permit persons to whom the Software is
12  * furnished to do so, subject to the following conditions:
13  *
14  * The above copyright notice and this permission notice shall be included in
15  * all copies or substantial portions of the Software.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23  * THE SOFTWARE.
24  */
25 
26 #include "hw/char/serial.h"
27 #include "hw/isa/isa.h"
28 
29 #define ISA_SERIAL(obj) OBJECT_CHECK(ISASerialState, (obj), TYPE_ISA_SERIAL)
30 
31 typedef struct ISASerialState {
32     ISADevice parent_obj;
33 
34     uint32_t index;
35     uint32_t iobase;
36     uint32_t isairq;
37     SerialState state;
38 } ISASerialState;
39 
40 static const int isa_serial_io[MAX_SERIAL_PORTS] = {
41     0x3f8, 0x2f8, 0x3e8, 0x2e8
42 };
43 static const int isa_serial_irq[MAX_SERIAL_PORTS] = {
44     4, 3, 4, 3
45 };
46 
47 static void serial_isa_realizefn(DeviceState *dev, Error **errp)
48 {
49     static int index;
50     ISADevice *isadev = ISA_DEVICE(dev);
51     ISASerialState *isa = ISA_SERIAL(dev);
52     SerialState *s = &isa->state;
53 
54     if (isa->index == -1) {
55         isa->index = index;
56     }
57     if (isa->index >= MAX_SERIAL_PORTS) {
58         error_setg(errp, "Max. supported number of ISA serial ports is %d.",
59                    MAX_SERIAL_PORTS);
60         return;
61     }
62     if (isa->iobase == -1) {
63         isa->iobase = isa_serial_io[isa->index];
64     }
65     if (isa->isairq == -1) {
66         isa->isairq = isa_serial_irq[isa->index];
67     }
68     index++;
69 
70     s->baudbase = 115200;
71     isa_init_irq(isadev, &s->irq, isa->isairq);
72     serial_realize_core(s, errp);
73     qdev_set_legacy_instance_id(dev, isa->iobase, 3);
74 
75     memory_region_init_io(&s->io, OBJECT(isa), &serial_io_ops, s, "serial", 8);
76     isa_register_ioport(isadev, &s->io, isa->iobase);
77 }
78 
79 static const VMStateDescription vmstate_isa_serial = {
80     .name = "serial",
81     .version_id = 3,
82     .minimum_version_id = 2,
83     .fields = (VMStateField[]) {
84         VMSTATE_STRUCT(state, ISASerialState, 0, vmstate_serial, SerialState),
85         VMSTATE_END_OF_LIST()
86     }
87 };
88 
89 static Property serial_isa_properties[] = {
90     DEFINE_PROP_UINT32("index",  ISASerialState, index,   -1),
91     DEFINE_PROP_UINT32("iobase",  ISASerialState, iobase,  -1),
92     DEFINE_PROP_UINT32("irq",    ISASerialState, isairq,  -1),
93     DEFINE_PROP_CHR("chardev",   ISASerialState, state.chr),
94     DEFINE_PROP_UINT32("wakeup", ISASerialState, state.wakeup, 0),
95     DEFINE_PROP_END_OF_LIST(),
96 };
97 
98 static void serial_isa_class_initfn(ObjectClass *klass, void *data)
99 {
100     DeviceClass *dc = DEVICE_CLASS(klass);
101 
102     dc->realize = serial_isa_realizefn;
103     dc->vmsd = &vmstate_isa_serial;
104     dc->props = serial_isa_properties;
105     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
106 }
107 
108 static const TypeInfo serial_isa_info = {
109     .name          = TYPE_ISA_SERIAL,
110     .parent        = TYPE_ISA_DEVICE,
111     .instance_size = sizeof(ISASerialState),
112     .class_init    = serial_isa_class_initfn,
113 };
114 
115 static void serial_register_types(void)
116 {
117     type_register_static(&serial_isa_info);
118 }
119 
120 type_init(serial_register_types)
121 
122 bool serial_isa_init(ISABus *bus, int index, CharDriverState *chr)
123 {
124     DeviceState *dev;
125     ISADevice *isadev;
126 
127     isadev = isa_try_create(bus, TYPE_ISA_SERIAL);
128     if (!isadev) {
129         return false;
130     }
131     dev = DEVICE(isadev);
132     qdev_prop_set_uint32(dev, "index", index);
133     qdev_prop_set_chr(dev, "chardev", chr);
134     if (qdev_init(dev) < 0) {
135         return false;
136     }
137     return true;
138 }
139