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     DeviceState *bridge = NULL;
  56
  57     if (isabus) {
  58         error_setg(errp, "Can't create a second ISA bus");
  59         return NULL;
  60     }
  61     if (!dev) {
  62         bridge = qdev_new("isabus-bridge");
  63         dev = bridge;
  64     }
  65
  66     isabus = ISA_BUS(qbus_new(TYPE_ISA_BUS, dev, NULL));
  67     isabus->address_space = address_space;
  68     isabus->address_space_io = address_space_io;
  69
  70     if (bridge) {
  71         sysbus_realize_and_unref(SYS_BUS_DEVICE(bridge), &error_fatal);
  72     }
  73
  74     return isabus;
  75 }
  76
  77 void isa_bus_register_input_irqs(ISABus *bus, qemu_irq *irqs_in)
  78 {
  79     bus->irqs_in = irqs_in;
  80 }
  81
  82 qemu_irq isa_bus_get_irq(ISABus *bus, unsigned irqnum)
  83 {
  84     assert(irqnum < ISA_NUM_IRQS);
  85     assert(bus->irqs_in);
  86     return bus->irqs_in[irqnum];
  87 }
  88
  89 /*
  90  * isa_get_irq() returns the corresponding input qemu_irq entry for the i8259.
  91  *
  92  * This function is only for special cases such as the 'ferr', and
  93  * temporary use for normal devices until they are converted to qdev.
  94  */
  95 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
  96 {
  97     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
  98     return isa_bus_get_irq(isabus, isairq);
  99 }
 100
 101 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
 102 {
 103     qemu_irq input_irq = isa_get_irq(isadev, isairq);
 104     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, input_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_bus_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(isa_address_space_io(dev), start, io);
 131     isa_init_ioport(dev, start);
 132 }
 133
 134 int 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     if (!isabus) {
 142         return -ENODEV;
 143     }
 144
 145     /* START is how we should treat DEV, regardless of the actual
 146        contents of the portio array.  This is how the old code
 147        actually handled e.g. the FDC device.  */
 148     isa_init_ioport(dev, start);
 149
 150     portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
 151     portio_list_add(piolist, isa_address_space_io(dev), start);
 152
 153     return 0;
 154 }
 155
 156 ISADevice *isa_new(const char *name)
 157 {
 158     return ISA_DEVICE(qdev_new(name));
 159 }
 160
 161 ISADevice *isa_try_new(const char *name)
 162 {
 163     return ISA_DEVICE(qdev_try_new(name));
 164 }
 165
 166 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 167 {
 168     ISADevice *dev;
 169
 170     dev = isa_new(name);
 171     isa_realize_and_unref(dev, bus, &error_fatal);
 172     return dev;
 173 }
 174
 175 bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
 176 {
 177     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
 178 }
 179
 180 ISABus *isa_bus_from_device(ISADevice *dev)
 181 {
 182     return ISA_BUS(qdev_get_parent_bus(DEVICE(dev)));
 183 }
 184
 185 ISADevice *isa_vga_init(ISABus *bus)
 186 {
 187     vga_interface_created = true;
 188     switch (vga_interface_type) {
 189     case VGA_CIRRUS:
 190         return isa_create_simple(bus, "isa-cirrus-vga");
 191     case VGA_QXL:
 192         error_report("%s: qxl: no PCI bus", __func__);
 193         return NULL;
 194     case VGA_STD:
 195         return isa_create_simple(bus, "isa-vga");
 196     case VGA_VMWARE:
 197         error_report("%s: vmware_vga: no PCI bus", __func__);
 198         return NULL;
 199     case VGA_VIRTIO:
 200         error_report("%s: virtio-vga: no PCI bus", __func__);
 201         return NULL;
 202     case VGA_NONE:
 203     default:
 204         return NULL;
 205     }
 206 }
 207
 208 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 209 {
 210     DeviceClass *dc = DEVICE_CLASS(klass);
 211
 212     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 213     dc->fw_name = "isa";
 214 }
 215
 216 static const TypeInfo isabus_bridge_info = {
 217     .name          = "isabus-bridge",
 218     .parent        = TYPE_SYS_BUS_DEVICE,
 219     .instance_size = sizeof(SysBusDevice),
 220     .class_init    = isabus_bridge_class_init,
 221 };
 222
 223 static void isa_device_class_init(ObjectClass *klass, void *data)
 224 {
 225     DeviceClass *k = DEVICE_CLASS(klass);
 226     k->bus_type = TYPE_ISA_BUS;
 227 }
 228
 229 static const TypeInfo isa_device_type_info = {
 230     .name = TYPE_ISA_DEVICE,
 231     .parent = TYPE_DEVICE,
 232     .instance_size = sizeof(ISADevice),
 233     .abstract = true,
 234     .class_init = isa_device_class_init,
 235 };
 236
 237 static void isabus_register_types(void)
 238 {
 239     type_register_static(&isa_dma_info);
 240     type_register_static(&isa_bus_info);
 241     type_register_static(&isabus_bridge_info);
 242     type_register_static(&isa_device_type_info);
 243 }
 244
 245 static char *isabus_get_fw_dev_path(DeviceState *dev)
 246 {
 247     ISADevice *d = ISA_DEVICE(dev);
 248     char path[40];
 249     int off;
 250
 251     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 252     if (d->ioport_id) {
 253         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 254     }
 255
 256     return g_strdup(path);
 257 }
 258
 259 MemoryRegion *isa_address_space(ISADevice *dev)
 260 {
 261     if (dev) {
 262         return isa_bus_from_device(dev)->address_space;
 263     }
 264
 265     return isabus->address_space;
 266 }
 267
 268 MemoryRegion *isa_address_space_io(ISADevice *dev)
 269 {
 270     if (dev) {
 271         return isa_bus_from_device(dev)->address_space_io;
 272     }
 273
 274     return isabus->address_space_io;
 275 }
 276
 277 type_init(isabus_register_types)