xref: /openbmc/qemu/hw/char/serial-isa.c (revision 650d103d3ea959212f826acb9d3fe80cf30e347b)
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 "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "qemu/module.h"
29 #include "hw/char/serial.h"
30 #include "hw/isa/isa.h"
31 #include "migration/vmstate.h"
32 
33 #define ISA_SERIAL(obj) OBJECT_CHECK(ISASerialState, (obj), TYPE_ISA_SERIAL)
34 
35 typedef struct ISASerialState {
36     ISADevice parent_obj;
37 
38     uint32_t index;
39     uint32_t iobase;
40     uint32_t isairq;
41     SerialState state;
42 } ISASerialState;
43 
44 static const int isa_serial_io[MAX_ISA_SERIAL_PORTS] = {
45     0x3f8, 0x2f8, 0x3e8, 0x2e8
46 };
47 static const int isa_serial_irq[MAX_ISA_SERIAL_PORTS] = {
48     4, 3, 4, 3
49 };
50 
51 static void serial_isa_realizefn(DeviceState *dev, Error **errp)
52 {
53     static int index;
54     ISADevice *isadev = ISA_DEVICE(dev);
55     ISASerialState *isa = ISA_SERIAL(dev);
56     SerialState *s = &isa->state;
57 
58     if (isa->index == -1) {
59         isa->index = index;
60     }
61     if (isa->index >= MAX_ISA_SERIAL_PORTS) {
62         error_setg(errp, "Max. supported number of ISA serial ports is %d.",
63                    MAX_ISA_SERIAL_PORTS);
64         return;
65     }
66     if (isa->iobase == -1) {
67         isa->iobase = isa_serial_io[isa->index];
68     }
69     if (isa->isairq == -1) {
70         isa->isairq = isa_serial_irq[isa->index];
71     }
72     index++;
73 
74     s->baudbase = 115200;
75     isa_init_irq(isadev, &s->irq, isa->isairq);
76     serial_realize_core(s, errp);
77     qdev_set_legacy_instance_id(dev, isa->iobase, 3);
78 
79     memory_region_init_io(&s->io, OBJECT(isa), &serial_io_ops, s, "serial", 8);
80     isa_register_ioport(isadev, &s->io, isa->iobase);
81 }
82 
83 static const VMStateDescription vmstate_isa_serial = {
84     .name = "serial",
85     .version_id = 3,
86     .minimum_version_id = 2,
87     .fields = (VMStateField[]) {
88         VMSTATE_STRUCT(state, ISASerialState, 0, vmstate_serial, SerialState),
89         VMSTATE_END_OF_LIST()
90     }
91 };
92 
93 static Property serial_isa_properties[] = {
94     DEFINE_PROP_UINT32("index",  ISASerialState, index,   -1),
95     DEFINE_PROP_UINT32("iobase",  ISASerialState, iobase,  -1),
96     DEFINE_PROP_UINT32("irq",    ISASerialState, isairq,  -1),
97     DEFINE_PROP_CHR("chardev",   ISASerialState, state.chr),
98     DEFINE_PROP_UINT32("wakeup", ISASerialState, state.wakeup, 0),
99     DEFINE_PROP_END_OF_LIST(),
100 };
101 
102 static void serial_isa_class_initfn(ObjectClass *klass, void *data)
103 {
104     DeviceClass *dc = DEVICE_CLASS(klass);
105 
106     dc->realize = serial_isa_realizefn;
107     dc->vmsd = &vmstate_isa_serial;
108     dc->props = serial_isa_properties;
109     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
110 }
111 
112 static const TypeInfo serial_isa_info = {
113     .name          = TYPE_ISA_SERIAL,
114     .parent        = TYPE_ISA_DEVICE,
115     .instance_size = sizeof(ISASerialState),
116     .class_init    = serial_isa_class_initfn,
117 };
118 
119 static void serial_register_types(void)
120 {
121     type_register_static(&serial_isa_info);
122 }
123 
124 type_init(serial_register_types)
125 
126 static void serial_isa_init(ISABus *bus, int index, Chardev *chr)
127 {
128     DeviceState *dev;
129     ISADevice *isadev;
130 
131     isadev = isa_create(bus, TYPE_ISA_SERIAL);
132     dev = DEVICE(isadev);
133     qdev_prop_set_uint32(dev, "index", index);
134     qdev_prop_set_chr(dev, "chardev", chr);
135     qdev_init_nofail(dev);
136 }
137 
138 void serial_hds_isa_init(ISABus *bus, int from, int to)
139 {
140     int i;
141 
142     assert(from >= 0);
143     assert(to <= MAX_ISA_SERIAL_PORTS);
144 
145     for (i = from; i < to; ++i) {
146         if (serial_hd(i)) {
147             serial_isa_init(bus, i, serial_hd(i));
148         }
149     }
150 }
151