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 "sysemu/sysemu.h"
30 #include "hw/acpi/acpi_aml_interface.h"
31 #include "hw/char/serial.h"
32 #include "hw/char/serial-isa.h"
33 #include "hw/isa/isa.h"
34 #include "hw/qdev-properties.h"
35 #include "migration/vmstate.h"
36 #include "qom/object.h"
37
38 OBJECT_DECLARE_SIMPLE_TYPE(ISASerialState, ISA_SERIAL)
39
40 struct ISASerialState {
41 ISADevice parent_obj;
42
43 uint32_t index;
44 uint32_t iobase;
45 uint32_t isairq;
46 SerialState state;
47 };
48
49 static const int isa_serial_io[MAX_ISA_SERIAL_PORTS] = {
50 0x3f8, 0x2f8, 0x3e8, 0x2e8
51 };
52 static const int isa_serial_irq[MAX_ISA_SERIAL_PORTS] = {
53 4, 3, 4, 3
54 };
55
serial_isa_realizefn(DeviceState * dev,Error ** errp)56 static void serial_isa_realizefn(DeviceState *dev, Error **errp)
57 {
58 static int index;
59 ISADevice *isadev = ISA_DEVICE(dev);
60 ISASerialState *isa = ISA_SERIAL(dev);
61 SerialState *s = &isa->state;
62
63 if (isa->index == -1) {
64 isa->index = index;
65 }
66 if (isa->index >= MAX_ISA_SERIAL_PORTS) {
67 error_setg(errp, "Max. supported number of ISA serial ports is %d.",
68 MAX_ISA_SERIAL_PORTS);
69 return;
70 }
71 if (isa->iobase == -1) {
72 isa->iobase = isa_serial_io[isa->index];
73 }
74 if (isa->isairq == -1) {
75 isa->isairq = isa_serial_irq[isa->index];
76 }
77 index++;
78
79 s->irq = isa_get_irq(isadev, isa->isairq);
80 qdev_realize(DEVICE(s), NULL, errp);
81 qdev_set_legacy_instance_id(dev, isa->iobase, 3);
82
83 memory_region_init_io(&s->io, OBJECT(isa), &serial_io_ops, s, "serial", 8);
84 isa_register_ioport(isadev, &s->io, isa->iobase);
85 }
86
serial_isa_build_aml(AcpiDevAmlIf * adev,Aml * scope)87 static void serial_isa_build_aml(AcpiDevAmlIf *adev, Aml *scope)
88 {
89 ISASerialState *isa = ISA_SERIAL(adev);
90 Aml *dev;
91 Aml *crs;
92
93 crs = aml_resource_template();
94 aml_append(crs, aml_io(AML_DECODE16, isa->iobase, isa->iobase, 0x00, 0x08));
95 aml_append(crs, aml_irq_no_flags(isa->isairq));
96
97 dev = aml_device("COM%d", isa->index + 1);
98 aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0501")));
99 aml_append(dev, aml_name_decl("_UID", aml_int(isa->index + 1)));
100 aml_append(dev, aml_name_decl("_STA", aml_int(0xf)));
101 aml_append(dev, aml_name_decl("_CRS", crs));
102
103 aml_append(scope, dev);
104 }
105
106 static const VMStateDescription vmstate_isa_serial = {
107 .name = "serial",
108 .version_id = 3,
109 .minimum_version_id = 2,
110 .fields = (const VMStateField[]) {
111 VMSTATE_STRUCT(state, ISASerialState, 0, vmstate_serial, SerialState),
112 VMSTATE_END_OF_LIST()
113 }
114 };
115
116 static Property serial_isa_properties[] = {
117 DEFINE_PROP_UINT32("index", ISASerialState, index, -1),
118 DEFINE_PROP_UINT32("iobase", ISASerialState, iobase, -1),
119 DEFINE_PROP_UINT32("irq", ISASerialState, isairq, -1),
120 DEFINE_PROP_END_OF_LIST(),
121 };
122
serial_isa_class_initfn(ObjectClass * klass,void * data)123 static void serial_isa_class_initfn(ObjectClass *klass, void *data)
124 {
125 DeviceClass *dc = DEVICE_CLASS(klass);
126 AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);
127
128 dc->realize = serial_isa_realizefn;
129 dc->vmsd = &vmstate_isa_serial;
130 adevc->build_dev_aml = serial_isa_build_aml;
131 device_class_set_props(dc, serial_isa_properties);
132 set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
133 }
134
serial_isa_initfn(Object * o)135 static void serial_isa_initfn(Object *o)
136 {
137 ISASerialState *self = ISA_SERIAL(o);
138
139 object_initialize_child(o, "serial", &self->state, TYPE_SERIAL);
140
141 qdev_alias_all_properties(DEVICE(&self->state), o);
142 }
143
144 static const TypeInfo serial_isa_info = {
145 .name = TYPE_ISA_SERIAL,
146 .parent = TYPE_ISA_DEVICE,
147 .instance_size = sizeof(ISASerialState),
148 .instance_init = serial_isa_initfn,
149 .class_init = serial_isa_class_initfn,
150 .interfaces = (InterfaceInfo[]) {
151 { TYPE_ACPI_DEV_AML_IF },
152 { },
153 },
154 };
155
serial_register_types(void)156 static void serial_register_types(void)
157 {
158 type_register_static(&serial_isa_info);
159 }
160
type_init(serial_register_types)161 type_init(serial_register_types)
162
163 static void serial_isa_init(ISABus *bus, int index, Chardev *chr)
164 {
165 DeviceState *dev;
166 ISADevice *isadev;
167
168 isadev = isa_new(TYPE_ISA_SERIAL);
169 dev = DEVICE(isadev);
170 qdev_prop_set_uint32(dev, "index", index);
171 qdev_prop_set_chr(dev, "chardev", chr);
172 isa_realize_and_unref(isadev, bus, &error_fatal);
173 }
174
serial_hds_isa_init(ISABus * bus,int from,int to)175 void serial_hds_isa_init(ISABus *bus, int from, int to)
176 {
177 int i;
178
179 assert(from >= 0);
180 assert(to <= MAX_ISA_SERIAL_PORTS);
181
182 for (i = from; i < to; ++i) {
183 if (serial_hd(i)) {
184 serial_isa_init(bus, i, serial_hd(i));
185 }
186 }
187 }
188
isa_serial_set_iobase(ISADevice * serial,hwaddr iobase)189 void isa_serial_set_iobase(ISADevice *serial, hwaddr iobase)
190 {
191 ISASerialState *s = ISA_SERIAL(serial);
192
193 serial->ioport_id = iobase;
194 s->iobase = iobase;
195 memory_region_set_address(&s->state.io, s->iobase);
196 }
197
isa_serial_set_enabled(ISADevice * serial,bool enabled)198 void isa_serial_set_enabled(ISADevice *serial, bool enabled)
199 {
200 memory_region_set_enabled(&ISA_SERIAL(serial)->state.io, enabled);
201 }
202