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 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 #include "qemu/osdep.h"
  20 #include "qemu/error-report.h"
  21 #include "qapi/error.h"
  22 #include "hw/hw.h"
  23 #include "monitor/monitor.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 void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  31 static char *isabus_get_fw_dev_path(DeviceState *dev);
  32
  33 static void isa_bus_class_init(ObjectClass *klass, void *data)
  34 {
  35     BusClass *k = BUS_CLASS(klass);
  36
  37     k->print_dev = isabus_dev_print;
  38     k->get_fw_dev_path = isabus_get_fw_dev_path;
  39 }
  40
  41 static const TypeInfo isa_dma_info = {
  42     .name = TYPE_ISADMA,
  43     .parent = TYPE_INTERFACE,
  44     .class_size = sizeof(IsaDmaClass),
  45 };
  46
  47 static const TypeInfo isa_bus_info = {
  48     .name = TYPE_ISA_BUS,
  49     .parent = TYPE_BUS,
  50     .instance_size = sizeof(ISABus),
  51     .class_init = isa_bus_class_init,
  52 };
  53
  54 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
  55                     MemoryRegion *address_space_io, Error **errp)
  56 {
  57     if (isabus) {
  58         error_setg(errp, "Can't create a second ISA bus");
  59         return NULL;
  60     }
  61     if (!dev) {
  62         dev = qdev_create(NULL, "isabus-bridge");
  63         qdev_init_nofail(dev);
  64     }
  65
  66     isabus = ISA_BUS(qbus_create(TYPE_ISA_BUS, dev, NULL));
  67     isabus->address_space = address_space;
  68     isabus->address_space_io = address_space_io;
  69     return isabus;
  70 }
  71
  72 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
  73 {
  74     bus->irqs = irqs;
  75 }
  76
  77 /*
  78  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  79  *
  80  * This function is only for special cases such as the 'ferr', and
  81  * temporary use for normal devices until they are converted to qdev.
  82  */
  83 qemu_irq isa_get_irq(ISADevice *dev, int isairq)
  84 {
  85     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
  86     if (isairq < 0 || isairq > 15) {
  87         hw_error("isa irq %d invalid", isairq);
  88     }
  89     return isabus->irqs[isairq];
  90 }
  91
  92 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  93 {
  94     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  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, int 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_create(ISABus *bus, const char *name)
 159 {
 160     DeviceState *dev;
 161
 162     dev = qdev_create(BUS(bus), name);
 163     return ISA_DEVICE(dev);
 164 }
 165
 166 ISADevice *isa_try_create(ISABus *bus, const char *name)
 167 {
 168     DeviceState *dev;
 169
 170     dev = qdev_try_create(BUS(bus), name);
 171     return ISA_DEVICE(dev);
 172 }
 173
 174 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 175 {
 176     ISADevice *dev;
 177
 178     dev = isa_create(bus, name);
 179     qdev_init_nofail(DEVICE(dev));
 180     return dev;
 181 }
 182
 183 ISADevice *isa_vga_init(ISABus *bus)
 184 {
 185     switch (vga_interface_type) {
 186     case VGA_CIRRUS:
 187         return isa_create_simple(bus, "isa-cirrus-vga");
 188     case VGA_QXL:
 189         error_report("%s: qxl: no PCI bus", __func__);
 190         return NULL;
 191     case VGA_STD:
 192         return isa_create_simple(bus, "isa-vga");
 193     case VGA_VMWARE:
 194         error_report("%s: vmware_vga: no PCI bus", __func__);
 195         return NULL;
 196     case VGA_VIRTIO:
 197         error_report("%s: virtio-vga: no PCI bus", __func__);
 198         return NULL;
 199     case VGA_NONE:
 200     default:
 201         return NULL;
 202     }
 203 }
 204
 205 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 206 {
 207     ISADevice *d = ISA_DEVICE(dev);
 208
 209     if (d->isairq[1] != -1) {
 210         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 211                        d->isairq[0], d->isairq[1]);
 212     } else if (d->isairq[0] != -1) {
 213         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 214                        d->isairq[0]);
 215     }
 216 }
 217
 218 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 219 {
 220     DeviceClass *dc = DEVICE_CLASS(klass);
 221
 222     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 223     dc->fw_name = "isa";
 224 }
 225
 226 static const TypeInfo isabus_bridge_info = {
 227     .name          = "isabus-bridge",
 228     .parent        = TYPE_SYS_BUS_DEVICE,
 229     .instance_size = sizeof(SysBusDevice),
 230     .class_init    = isabus_bridge_class_init,
 231 };
 232
 233 static void isa_device_class_init(ObjectClass *klass, void *data)
 234 {
 235     DeviceClass *k = DEVICE_CLASS(klass);
 236     k->bus_type = TYPE_ISA_BUS;
 237 }
 238
 239 static const TypeInfo isa_device_type_info = {
 240     .name = TYPE_ISA_DEVICE,
 241     .parent = TYPE_DEVICE,
 242     .instance_size = sizeof(ISADevice),
 243     .instance_init = isa_device_init,
 244     .abstract = true,
 245     .class_size = sizeof(ISADeviceClass),
 246     .class_init = isa_device_class_init,
 247 };
 248
 249 static void isabus_register_types(void)
 250 {
 251     type_register_static(&isa_dma_info);
 252     type_register_static(&isa_bus_info);
 253     type_register_static(&isabus_bridge_info);
 254     type_register_static(&isa_device_type_info);
 255 }
 256
 257 static char *isabus_get_fw_dev_path(DeviceState *dev)
 258 {
 259     ISADevice *d = ISA_DEVICE(dev);
 260     char path[40];
 261     int off;
 262
 263     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 264     if (d->ioport_id) {
 265         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 266     }
 267
 268     return g_strdup(path);
 269 }
 270
 271 MemoryRegion *isa_address_space(ISADevice *dev)
 272 {
 273     if (dev) {
 274         return isa_bus_from_device(dev)->address_space;
 275     }
 276
 277     return isabus->address_space;
 278 }
 279
 280 MemoryRegion *isa_address_space_io(ISADevice *dev)
 281 {
 282     if (dev) {
 283         return isa_bus_from_device(dev)->address_space_io;
 284     }
 285
 286     return isabus->address_space_io;
 287 }
 288
 289 type_init(isabus_register_types)