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