hw/isa/isa-bus.c

   1 /*
   2  * isa bus support for qdev.
   3  *
   4  * Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu/error-report.h"
  22 #include "qemu/module.h"
  23 #include "qapi/error.h"
  24 #include "hw/sysbus.h"
  25 #include "sysemu/sysemu.h"
  26 #include "hw/isa/isa.h"
  27
  28 static ISABus *isabus;
  29
  30 static char *isabus_get_fw_dev_path(DeviceState *dev);
  31
  32 static void isa_bus_class_init(ObjectClass *klass, void *data)
  33 {
  34     BusClass *k = BUS_CLASS(klass);
  35
  36     k->get_fw_dev_path = isabus_get_fw_dev_path;
  37 }
  38
  39 static const TypeInfo isa_dma_info = {
  40     .name = TYPE_ISADMA,
  41     .parent = TYPE_INTERFACE,
  42     .class_size = sizeof(IsaDmaClass),
  43 };
  44
  45 static const TypeInfo isa_bus_info = {
  46     .name = TYPE_ISA_BUS,
  47     .parent = TYPE_BUS,
  48     .instance_size = sizeof(ISABus),
  49     .class_init = isa_bus_class_init,
  50 };
  51
  52 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
  53                     MemoryRegion *address_space_io, Error **errp)
  54 {
  55     if (isabus) {
  56         error_setg(errp, "Can't create a second ISA bus");
  57         return NULL;
  58     }
  59     if (!dev) {
  60         dev = qdev_new("isabus-bridge");
  61         sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
  62     }
  63
  64     isabus = ISA_BUS(qbus_new(TYPE_ISA_BUS, dev, NULL));
  65     isabus->address_space = address_space;
  66     isabus->address_space_io = address_space_io;
  67     return isabus;
  68 }
  69
  70 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
  71 {
  72     bus->irqs = irqs;
  73 }
  74
  75 /*
  76  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  77  *
  78  * This function is only for special cases such as the 'ferr', and
  79  * temporary use for normal devices until they are converted to qdev.
  80  */
  81 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
  82 {
  83     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
  84     assert(isairq < ISA_NUM_IRQS);
  85     return isabus->irqs[isairq];
  86 }
  87
  88 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
  89 {
  90     qemu_irq irq = isa_get_irq(isadev, isairq);
  91     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
  92 }
  93
  94 void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
  95 {
  96     assert(bus && dma8 && dma16);
  97     assert(!bus->dma[0] && !bus->dma[1]);
  98     bus->dma[0] = dma8;
  99     bus->dma[1] = dma16;
 100 }
 101
 102 IsaDma *isa_get_dma(ISABus *bus, int nchan)
 103 {
 104     assert(bus);
 105     return bus->dma[nchan > 3 ? 1 : 0];
 106 }
 107
 108 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 109 {
 110     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
 111         dev->ioport_id = ioport;
 112     }
 113 }
 114
 115 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
 116 {
 117     memory_region_add_subregion(isabus->address_space_io, start, io);
 118     isa_init_ioport(dev, start);
 119 }
 120
 121 int isa_register_portio_list(ISADevice *dev,
 122                              PortioList *piolist, uint16_t start,
 123                              const MemoryRegionPortio *pio_start,
 124                              void *opaque, const char *name)
 125 {
 126     assert(piolist && !piolist->owner);
 127
 128     if (!isabus) {
 129         return -ENODEV;
 130     }
 131
 132     /* START is how we should treat DEV, regardless of the actual
 133        contents of the portio array.  This is how the old code
 134        actually handled e.g. the FDC device.  */
 135     isa_init_ioport(dev, start);
 136
 137     portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
 138     portio_list_add(piolist, isabus->address_space_io, start);
 139
 140     return 0;
 141 }
 142
 143 ISADevice *isa_new(const char *name)
 144 {
 145     return ISA_DEVICE(qdev_new(name));
 146 }
 147
 148 ISADevice *isa_try_new(const char *name)
 149 {
 150     return ISA_DEVICE(qdev_try_new(name));
 151 }
 152
 153 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 154 {
 155     ISADevice *dev;
 156
 157     dev = isa_new(name);
 158     isa_realize_and_unref(dev, bus, &error_fatal);
 159     return dev;
 160 }
 161
 162 bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
 163 {
 164     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
 165 }
 166
 167 ISADevice *isa_vga_init(ISABus *bus)
 168 {
 169     switch (vga_interface_type) {
 170     case VGA_CIRRUS:
 171         return isa_create_simple(bus, "isa-cirrus-vga");
 172     case VGA_QXL:
 173         error_report("%s: qxl: no PCI bus", __func__);
 174         return NULL;
 175     case VGA_STD:
 176         return isa_create_simple(bus, "isa-vga");
 177     case VGA_VMWARE:
 178         error_report("%s: vmware_vga: no PCI bus", __func__);
 179         return NULL;
 180     case VGA_VIRTIO:
 181         error_report("%s: virtio-vga: no PCI bus", __func__);
 182         return NULL;
 183     case VGA_NONE:
 184     default:
 185         return NULL;
 186     }
 187 }
 188
 189 void isa_build_aml(ISABus *bus, Aml *scope)
 190 {
 191     BusChild *kid;
 192     ISADevice *dev;
 193     ISADeviceClass *dc;
 194
 195     QTAILQ_FOREACH(kid, &bus->parent_obj.children, sibling) {
 196         dev = ISA_DEVICE(kid->child);
 197         dc = ISA_DEVICE_GET_CLASS(dev);
 198         if (dc->build_aml) {
 199             dc->build_aml(dev, scope);
 200         }
 201     }
 202 }
 203
 204 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 205 {
 206     DeviceClass *dc = DEVICE_CLASS(klass);
 207
 208     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 209     dc->fw_name = "isa";
 210 }
 211
 212 static const TypeInfo isabus_bridge_info = {
 213     .name          = "isabus-bridge",
 214     .parent        = TYPE_SYS_BUS_DEVICE,
 215     .instance_size = sizeof(SysBusDevice),
 216     .class_init    = isabus_bridge_class_init,
 217 };
 218
 219 static void isa_device_class_init(ObjectClass *klass, void *data)
 220 {
 221     DeviceClass *k = DEVICE_CLASS(klass);
 222     k->bus_type = TYPE_ISA_BUS;
 223 }
 224
 225 static const TypeInfo isa_device_type_info = {
 226     .name = TYPE_ISA_DEVICE,
 227     .parent = TYPE_DEVICE,
 228     .instance_size = sizeof(ISADevice),
 229     .abstract = true,
 230     .class_size = sizeof(ISADeviceClass),
 231     .class_init = isa_device_class_init,
 232 };
 233
 234 static void isabus_register_types(void)
 235 {
 236     type_register_static(&isa_dma_info);
 237     type_register_static(&isa_bus_info);
 238     type_register_static(&isabus_bridge_info);
 239     type_register_static(&isa_device_type_info);
 240 }
 241
 242 static char *isabus_get_fw_dev_path(DeviceState *dev)
 243 {
 244     ISADevice *d = ISA_DEVICE(dev);
 245     char path[40];
 246     int off;
 247
 248     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 249     if (d->ioport_id) {
 250         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 251     }
 252
 253     return g_strdup(path);
 254 }
 255
 256 MemoryRegion *isa_address_space(ISADevice *dev)
 257 {
 258     if (dev) {
 259         return isa_bus_from_device(dev)->address_space;
 260     }
 261
 262     return isabus->address_space;
 263 }
 264
 265 MemoryRegion *isa_address_space_io(ISADevice *dev)
 266 {
 267     if (dev) {
 268         return isa_bus_from_device(dev)->address_space_io;
 269     }
 270
 271     return isabus->address_space_io;
 272 }
 273
 274 type_init(isabus_register_types)