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_register_input_irqs(ISABus *bus, qemu_irq *irqs_in)
  71 {
  72     bus->irqs_in = irqs_in;
  73 }
  74
  75 qemu_irq isa_bus_get_irq(ISABus *bus, unsigned irqnum)
  76 {
  77     assert(irqnum < ISA_NUM_IRQS);
  78     assert(bus->irqs_in);
  79     return bus->irqs_in[irqnum];
  80 }
  81
  82 /*
  83  * isa_get_irq() returns the corresponding input qemu_irq entry for the i8259.
  84  *
  85  * This function is only for special cases such as the 'ferr', and
  86  * temporary use for normal devices until they are converted to qdev.
  87  */
  88 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
  89 {
  90     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
  91     return isa_bus_get_irq(isabus, isairq);
  92 }
  93
  94 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
  95 {
  96     qemu_irq input_irq = isa_get_irq(isadev, isairq);
  97     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, input_irq);
  98 }
  99
 100 void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
 101 {
 102     assert(bus && dma8 && dma16);
 103     assert(!bus->dma[0] && !bus->dma[1]);
 104     bus->dma[0] = dma8;
 105     bus->dma[1] = dma16;
 106 }
 107
 108 IsaDma *isa_bus_get_dma(ISABus *bus, int nchan)
 109 {
 110     assert(bus);
 111     return bus->dma[nchan > 3 ? 1 : 0];
 112 }
 113
 114 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 115 {
 116     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
 117         dev->ioport_id = ioport;
 118     }
 119 }
 120
 121 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
 122 {
 123     memory_region_add_subregion(isa_address_space_io(dev), start, io);
 124     isa_init_ioport(dev, start);
 125 }
 126
 127 int isa_register_portio_list(ISADevice *dev,
 128                              PortioList *piolist, uint16_t start,
 129                              const MemoryRegionPortio *pio_start,
 130                              void *opaque, const char *name)
 131 {
 132     assert(piolist && !piolist->owner);
 133
 134     if (!isabus) {
 135         return -ENODEV;
 136     }
 137
 138     /* START is how we should treat DEV, regardless of the actual
 139        contents of the portio array.  This is how the old code
 140        actually handled e.g. the FDC device.  */
 141     isa_init_ioport(dev, start);
 142
 143     portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
 144     portio_list_add(piolist, isa_address_space_io(dev), start);
 145
 146     return 0;
 147 }
 148
 149 ISADevice *isa_new(const char *name)
 150 {
 151     return ISA_DEVICE(qdev_new(name));
 152 }
 153
 154 ISADevice *isa_try_new(const char *name)
 155 {
 156     return ISA_DEVICE(qdev_try_new(name));
 157 }
 158
 159 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 160 {
 161     ISADevice *dev;
 162
 163     dev = isa_new(name);
 164     isa_realize_and_unref(dev, bus, &error_fatal);
 165     return dev;
 166 }
 167
 168 bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
 169 {
 170     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
 171 }
 172
 173 ISABus *isa_bus_from_device(ISADevice *dev)
 174 {
 175     return ISA_BUS(qdev_get_parent_bus(DEVICE(dev)));
 176 }
 177
 178 ISADevice *isa_vga_init(ISABus *bus)
 179 {
 180     vga_interface_created = true;
 181     switch (vga_interface_type) {
 182     case VGA_CIRRUS:
 183         return isa_create_simple(bus, "isa-cirrus-vga");
 184     case VGA_QXL:
 185         error_report("%s: qxl: no PCI bus", __func__);
 186         return NULL;
 187     case VGA_STD:
 188         return isa_create_simple(bus, "isa-vga");
 189     case VGA_VMWARE:
 190         error_report("%s: vmware_vga: no PCI bus", __func__);
 191         return NULL;
 192     case VGA_VIRTIO:
 193         error_report("%s: virtio-vga: no PCI bus", __func__);
 194         return NULL;
 195     case VGA_NONE:
 196     default:
 197         return NULL;
 198     }
 199 }
 200
 201 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 202 {
 203     DeviceClass *dc = DEVICE_CLASS(klass);
 204
 205     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 206     dc->fw_name = "isa";
 207 }
 208
 209 static const TypeInfo isabus_bridge_info = {
 210     .name          = "isabus-bridge",
 211     .parent        = TYPE_SYS_BUS_DEVICE,
 212     .instance_size = sizeof(SysBusDevice),
 213     .class_init    = isabus_bridge_class_init,
 214 };
 215
 216 static void isa_device_class_init(ObjectClass *klass, void *data)
 217 {
 218     DeviceClass *k = DEVICE_CLASS(klass);
 219     k->bus_type = TYPE_ISA_BUS;
 220 }
 221
 222 static const TypeInfo isa_device_type_info = {
 223     .name = TYPE_ISA_DEVICE,
 224     .parent = TYPE_DEVICE,
 225     .instance_size = sizeof(ISADevice),
 226     .abstract = true,
 227     .class_init = isa_device_class_init,
 228 };
 229
 230 static void isabus_register_types(void)
 231 {
 232     type_register_static(&isa_dma_info);
 233     type_register_static(&isa_bus_info);
 234     type_register_static(&isabus_bridge_info);
 235     type_register_static(&isa_device_type_info);
 236 }
 237
 238 static char *isabus_get_fw_dev_path(DeviceState *dev)
 239 {
 240     ISADevice *d = ISA_DEVICE(dev);
 241     char path[40];
 242     int off;
 243
 244     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 245     if (d->ioport_id) {
 246         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 247     }
 248
 249     return g_strdup(path);
 250 }
 251
 252 MemoryRegion *isa_address_space(ISADevice *dev)
 253 {
 254     if (dev) {
 255         return isa_bus_from_device(dev)->address_space;
 256     }
 257
 258     return isabus->address_space;
 259 }
 260
 261 MemoryRegion *isa_address_space_io(ISADevice *dev)
 262 {
 263     if (dev) {
 264         return isa_bus_from_device(dev)->address_space_io;
 265     }
 266
 267     return isabus->address_space_io;
 268 }
 269
 270 type_init(isabus_register_types)