hw/char/serial-isa.c

   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
  37 OBJECT_DECLARE_SIMPLE_TYPE(ISASerialState, ISA_SERIAL)
  38
  39 struct ISASerialState {
  40     ISADevice parent_obj;
  41
  42     uint32_t index;
  43     uint32_t iobase;
  44     uint32_t isairq;
  45     SerialState state;
  46 };
  47
  48 static const int isa_serial_io[MAX_ISA_SERIAL_PORTS] = {
  49     0x3f8, 0x2f8, 0x3e8, 0x2e8
  50 };
  51 static const int isa_serial_irq[MAX_ISA_SERIAL_PORTS] = {
  52     4, 3, 4, 3
  53 };
  54
  55 static 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
  86 static 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
 105 static const VMStateDescription vmstate_isa_serial = {
 106     .name = "serial",
 107     .version_id = 3,
 108     .minimum_version_id = 2,
 109     .fields = (const VMStateField[]) {
 110         VMSTATE_STRUCT(state, ISASerialState, 0, vmstate_serial, SerialState),
 111         VMSTATE_END_OF_LIST()
 112     }
 113 };
 114
 115 static 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
 122 static 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
 134 static 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
 143 static 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
 155 static void serial_register_types(void)
 156 {
 157     type_register_static(&serial_isa_info);
 158 }
 159
 160 type_init(serial_register_types)
 161
 162 static 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
 174 void 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
 188 void isa_serial_set_iobase(ISADevice *serial, hwaddr iobase)
 189 {
 190     ISASerialState *s = ISA_SERIAL(serial);
 191
 192     serial->ioport_id = iobase;
 193     s->iobase = iobase;
 194     memory_region_set_address(&s->state.io, s->iobase);
 195 }
 196
 197 void isa_serial_set_enabled(ISADevice *serial, bool enabled)
 198 {
 199     memory_region_set_enabled(&ISA_SERIAL(serial)->state.io, enabled);
 200 }