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 #include "hw/acpi/acpi_aml_interface.h"
  28
  29 static ISABus *isabus;
  30
  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->get_fw_dev_path = isabus_get_fw_dev_path;
  38 }
  39
  40 static const TypeInfo isa_dma_info = {
  41     .name = TYPE_ISADMA,
  42     .parent = TYPE_INTERFACE,
  43     .class_size = sizeof(IsaDmaClass),
  44 };
  45
  46 static const TypeInfo isa_bus_info = {
  47     .name = TYPE_ISA_BUS,
  48     .parent = TYPE_BUS,
  49     .instance_size = sizeof(ISABus),
  50     .class_init = isa_bus_class_init,
  51 };
  52
  53 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion* address_space,
  54                     MemoryRegion *address_space_io, Error **errp)
  55 {
  56     if (isabus) {
  57         error_setg(errp, "Can't create a second ISA bus");
  58         return NULL;
  59     }
  60     if (!dev) {
  61         dev = qdev_new("isabus-bridge");
  62         sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
  63     }
  64
  65     isabus = ISA_BUS(qbus_new(TYPE_ISA_BUS, dev, NULL));
  66     isabus->address_space = address_space;
  67     isabus->address_space_io = address_space_io;
  68     return isabus;
  69 }
  70
  71 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
  72 {
  73     bus->irqs = irqs;
  74 }
  75
  76 /*
  77  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  78  *
  79  * This function is only for special cases such as the 'ferr', and
  80  * temporary use for normal devices until they are converted to qdev.
  81  */
  82 qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq)
  83 {
  84     assert(!dev || ISA_BUS(qdev_get_parent_bus(DEVICE(dev))) == isabus);
  85     assert(isairq < ISA_NUM_IRQS);
  86     return isabus->irqs[isairq];
  87 }
  88
  89 void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq)
  90 {
  91     qemu_irq irq = isa_get_irq(isadev, isairq);
  92     qdev_connect_gpio_out(DEVICE(isadev), gpioirq, irq);
  93 }
  94
  95 void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16)
  96 {
  97     assert(bus && dma8 && dma16);
  98     assert(!bus->dma[0] && !bus->dma[1]);
  99     bus->dma[0] = dma8;
 100     bus->dma[1] = dma16;
 101 }
 102
 103 IsaDma *isa_get_dma(ISABus *bus, int nchan)
 104 {
 105     assert(bus);
 106     return bus->dma[nchan > 3 ? 1 : 0];
 107 }
 108
 109 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 110 {
 111     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
 112         dev->ioport_id = ioport;
 113     }
 114 }
 115
 116 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
 117 {
 118     memory_region_add_subregion(isabus->address_space_io, start, io);
 119     isa_init_ioport(dev, start);
 120 }
 121
 122 int isa_register_portio_list(ISADevice *dev,
 123                              PortioList *piolist, uint16_t start,
 124                              const MemoryRegionPortio *pio_start,
 125                              void *opaque, const char *name)
 126 {
 127     assert(piolist && !piolist->owner);
 128
 129     if (!isabus) {
 130         return -ENODEV;
 131     }
 132
 133     /* START is how we should treat DEV, regardless of the actual
 134        contents of the portio array.  This is how the old code
 135        actually handled e.g. the FDC device.  */
 136     isa_init_ioport(dev, start);
 137
 138     portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
 139     portio_list_add(piolist, isabus->address_space_io, start);
 140
 141     return 0;
 142 }
 143
 144 ISADevice *isa_new(const char *name)
 145 {
 146     return ISA_DEVICE(qdev_new(name));
 147 }
 148
 149 ISADevice *isa_try_new(const char *name)
 150 {
 151     return ISA_DEVICE(qdev_try_new(name));
 152 }
 153
 154 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 155 {
 156     ISADevice *dev;
 157
 158     dev = isa_new(name);
 159     isa_realize_and_unref(dev, bus, &error_fatal);
 160     return dev;
 161 }
 162
 163 bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp)
 164 {
 165     return qdev_realize_and_unref(&dev->parent_obj, &bus->parent_obj, errp);
 166 }
 167
 168 ISADevice *isa_vga_init(ISABus *bus)
 169 {
 170     vga_interface_created = true;
 171     switch (vga_interface_type) {
 172     case VGA_CIRRUS:
 173         return isa_create_simple(bus, "isa-cirrus-vga");
 174     case VGA_QXL:
 175         error_report("%s: qxl: no PCI bus", __func__);
 176         return NULL;
 177     case VGA_STD:
 178         return isa_create_simple(bus, "isa-vga");
 179     case VGA_VMWARE:
 180         error_report("%s: vmware_vga: no PCI bus", __func__);
 181         return NULL;
 182     case VGA_VIRTIO:
 183         error_report("%s: virtio-vga: no PCI bus", __func__);
 184         return NULL;
 185     case VGA_NONE:
 186     default:
 187         return NULL;
 188     }
 189 }
 190
 191 void isa_build_aml(ISABus *bus, Aml *scope)
 192 {
 193     BusChild *kid;
 194
 195     QTAILQ_FOREACH(kid, &bus->parent_obj.children, sibling) {
 196         call_dev_aml_func(DEVICE(kid->child), scope);
 197     }
 198 }
 199
 200 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 201 {
 202     DeviceClass *dc = DEVICE_CLASS(klass);
 203
 204     set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
 205     dc->fw_name = "isa";
 206 }
 207
 208 static const TypeInfo isabus_bridge_info = {
 209     .name          = "isabus-bridge",
 210     .parent        = TYPE_SYS_BUS_DEVICE,
 211     .instance_size = sizeof(SysBusDevice),
 212     .class_init    = isabus_bridge_class_init,
 213 };
 214
 215 static void isa_device_class_init(ObjectClass *klass, void *data)
 216 {
 217     DeviceClass *k = DEVICE_CLASS(klass);
 218     k->bus_type = TYPE_ISA_BUS;
 219 }
 220
 221 static const TypeInfo isa_device_type_info = {
 222     .name = TYPE_ISA_DEVICE,
 223     .parent = TYPE_DEVICE,
 224     .instance_size = sizeof(ISADevice),
 225     .abstract = true,
 226     .class_size = sizeof(ISADeviceClass),
 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)