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 "monitor/monitor.h"
  25 #include "hw/sysbus.h"
  26 #include "sysemu/sysemu.h"
  27 #include "hw/isa/isa.h"
  28
  29 static ISABus *isabus;
  30
  31 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  32 static char *isabus_get_fw_dev_path(DeviceState *dev);
  33
  34 static void isa_bus_class_init(ObjectClass *klass, void *data)
  35 {
  36     BusClass *k = BUS_CLASS(klass);
  37
  38     k->print_dev = isabus_dev_print;
  39     k->get_fw_dev_path = isabus_get_fw_dev_path;
  40 }
  41
  42 static const TypeInfo isa_dma_info = {
  43     .name = TYPE_ISADMA,
  44     .parent = TYPE_INTERFACE,
  45     .class_size = sizeof(IsaDmaClass),
  46 };
  47
  48 static const TypeInfo isa_bus_info = {
  49     .name = TYPE_ISA_BUS,
  50     .parent = TYPE_BUS,
  51     .instance_size = sizeof(ISABus),
  52     .class_init = isa_bus_class_init,
  53 };
  54
  55 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
  56                     MemoryRegion *address_space_io, Error **errp)
  57 {
  58     if (isabus) {
  59         error_setg(errp, "Can't create a second ISA bus");
  60         return NULL;
  61     }
  62     if (!dev) {
  63         dev = qdev_new("isabus-bridge");
  64         sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
  65     }
  66
  67     isabus = ISA_BUS(qbus_create(TYPE_ISA_BUS, dev, NULL));
  68     isabus->address_space = address_space;
  69     isabus->address_space_io = address_space_io;
  70     return isabus;
  71 }
  72
  73 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
  74 {
  75     bus->irqs = irqs;
  76 }
  77
  78 /*
  79  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  80  *
  81  * This function is only for special cases such as the 'ferr', and
  82  * temporary use for normal devices until they are converted to qdev.
  83  */
  84 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
  85 {
  86     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
  87     assert(isairq < ISA_NUM_IRQS);
  88     return isabus->irqs[isairq];
  89 }
  90
  91 void isa_init_irq(ISADevice *dev, qemu_irq *p, unsigned isairq)
  92 {
  93     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  94     assert(isairq < ISA_NUM_IRQS);
  95     dev->isairq[dev->nirqs] = isairq;
  96     *p = isa_get_irq(dev, isairq);
  97     dev->nirqs++;
  98 }
  99
 100 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
 101 {
 102     qemu_irq irq;
 103     isa_init_irq(isadev, &irq, isairq);
 104     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
 105 }
 106
 107 void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
 108 {
 109     assert(bus && dma8 && dma16);
 110     assert(!bus->dma[0] && !bus->dma[1]);
 111     bus->dma[0] = dma8;
 112     bus->dma[1] = dma16;
 113 }
 114
 115 IsaDma *isa_get_dma(ISABus *bus, int nchan)
 116 {
 117     assert(bus);
 118     return bus->dma[nchan > 3 ? 1 : 0];
 119 }
 120
 121 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 122 {
 123     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
 124         dev->ioport_id = ioport;
 125     }
 126 }
 127
 128 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
 129 {
 130     memory_region_add_subregion(isabus->address_space_io, start, io);
 131     isa_init_ioport(dev, start);
 132 }
 133
 134 void isa_register_portio_list(ISADevice *dev,
 135                               PortioList *piolist, uint16_t start,
 136                               const MemoryRegionPortio *pio_start,
 137                               void *opaque, const char *name)
 138 {
 139     assert(piolist && !piolist->owner);
 140
 141     /* START is how we should treat DEV, regardless of the actual
 142        contents of the portio array.  This is how the old code
 143        actually handled e.g. the FDC device.  */
 144     isa_init_ioport(dev, start);
 145
 146     portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
 147     portio_list_add(piolist, isabus->address_space_io, start);
 148 }
 149
 150 static void isa_device_init(Object *obj)
 151 {
 152     ISADevice *dev = ISA_DEVICE(obj);
 153
 154     dev->isairq[0] = -1;
 155     dev->isairq[1] = -1;
 156 }
 157
 158 ISADevice *isa_new(const char *name)
 159 {
 160     return ISA_DEVICE(qdev_new(name));
 161 }
 162
 163 ISADevice *isa_try_new(const char *name)
 164 {
 165     return ISA_DEVICE(qdev_try_new(name));
 166 }
 167
 168 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 169 {
 170     ISADevice *dev;
 171
 172     dev = isa_new(name);
 173     isa_realize_and_unref(dev, bus, &error_fatal);
 174     return dev;
 175 }
 176
 177 bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
 178 {
 179     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
 180 }
 181
 182 ISADevice *isa_vga_init(ISABus *bus)
 183 {
 184     switch (vga_interface_type) {
 185     case VGA_CIRRUS:
 186         return isa_create_simple(bus, "isa-cirrus-vga");
 187     case VGA_QXL:
 188         error_report("%s: qxl: no PCI bus", __func__);
 189         return NULL;
 190     case VGA_STD:
 191         return isa_create_simple(bus, "isa-vga");
 192     case VGA_VMWARE:
 193         error_report("%s: vmware_vga: no PCI bus", __func__);
 194         return NULL;
 195     case VGA_VIRTIO:
 196         error_report("%s: virtio-vga: no PCI bus", __func__);
 197         return NULL;
 198     case VGA_NONE:
 199     default:
 200         return NULL;
 201     }
 202 }
 203
 204 void isa_build_aml(ISABus *bus, Aml *scope)
 205 {
 206     BusChild *kid;
 207     ISADevice *dev;
 208     ISADeviceClass *dc;
 209
 210     QTAILQ_FOREACH(kid, &bus->parent_obj.children, sibling) {
 211         dev = ISA_DEVICE(kid->child);
 212         dc = ISA_DEVICE_GET_CLASS(dev);
 213         if (dc->build_aml) {
 214             dc->build_aml(dev, scope);
 215         }
 216     }
 217 }
 218
 219 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 220 {
 221     ISADevice *d = ISA_DEVICE(dev);
 222
 223     if (d->isairq[1] != -1) {
 224         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 225                        d->isairq[0], d->isairq[1]);
 226     } else if (d->isairq[0] != -1) {
 227         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 228                        d->isairq[0]);
 229     }
 230 }
 231
 232 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 233 {
 234     DeviceClass *dc = DEVICE_CLASS(klass);
 235
 236     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 237     dc->fw_name = "isa";
 238 }
 239
 240 static const TypeInfo isabus_bridge_info = {
 241     .name          = "isabus-bridge",
 242     .parent        = TYPE_SYS_BUS_DEVICE,
 243     .instance_size = sizeof(SysBusDevice),
 244     .class_init    = isabus_bridge_class_init,
 245 };
 246
 247 static void isa_device_class_init(ObjectClass *klass, void *data)
 248 {
 249     DeviceClass *k = DEVICE_CLASS(klass);
 250     k->bus_type = TYPE_ISA_BUS;
 251 }
 252
 253 static const TypeInfo isa_device_type_info = {
 254     .name = TYPE_ISA_DEVICE,
 255     .parent = TYPE_DEVICE,
 256     .instance_size = sizeof(ISADevice),
 257     .instance_init = isa_device_init,
 258     .abstract = true,
 259     .class_size = sizeof(ISADeviceClass),
 260     .class_init = isa_device_class_init,
 261 };
 262
 263 static void isabus_register_types(void)
 264 {
 265     type_register_static(&isa_dma_info);
 266     type_register_static(&isa_bus_info);
 267     type_register_static(&isabus_bridge_info);
 268     type_register_static(&isa_device_type_info);
 269 }
 270
 271 static char *isabus_get_fw_dev_path(DeviceState *dev)
 272 {
 273     ISADevice *d = ISA_DEVICE(dev);
 274     char path[40];
 275     int off;
 276
 277     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 278     if (d->ioport_id) {
 279         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 280     }
 281
 282     return g_strdup(path);
 283 }
 284
 285 MemoryRegion *isa_address_space(ISADevice *dev)
 286 {
 287     if (dev) {
 288         return isa_bus_from_device(dev)->address_space;
 289     }
 290
 291     return isabus->address_space;
 292 }
 293
 294 MemoryRegion *isa_address_space_io(ISADevice *dev)
 295 {
 296     if (dev) {
 297         return isa_bus_from_device(dev)->address_space_io;
 298     }
 299
 300     return isabus->address_space_io;
 301 }
 302
 303 type_init(isabus_register_types)