hw/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 "hw.h"
  20 #include "monitor.h"
  21 #include "sysbus.h"
  22 #include "isa.h"
  23 #include "exec-memory.h"
  24
  25 static ISABus *isabus;
  26 target_phys_addr_t isa_mem_base = 0;
  27
  28 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  29 static char *isabus_get_fw_dev_path(DeviceState *dev);
  30
  31 static struct BusInfo isa_bus_info = {
  32     .name      = "ISA",
  33     .size      = sizeof(ISABus),
  34     .print_dev = isabus_dev_print,
  35     .get_fw_dev_path = isabus_get_fw_dev_path,
  36 };
  37
  38 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space_io)
  39 {
  40     if (isabus) {
  41         fprintf(stderr, "Can't create a second ISA bus\n");
  42         return NULL;
  43     }
  44     if (NULL == dev) {
  45         dev = qdev_create(NULL, "isabus-bridge");
  46         qdev_init_nofail(dev);
  47     }
  48
  49     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  50     isabus->address_space_io = address_space_io;
  51     return isabus;
  52 }
  53
  54 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
  55 {
  56     if (!bus) {
  57         hw_error("Can't set isa irqs with no isa bus present.");
  58     }
  59     bus->irqs = irqs;
  60 }
  61
  62 /*
  63  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  64  *
  65  * This function is only for special cases such as the 'ferr', and
  66  * temporary use for normal devices until they are converted to qdev.
  67  */
  68 qemu_irq isa_get_irq(ISADevice *dev, int isairq)
  69 {
  70     assert(!dev || DO_UPCAST(ISABus, qbus, dev->qdev.parent_bus) == isabus);
  71     if (isairq < 0 || isairq > 23) {
  72         hw_error("isa irq %d invalid", isairq);
  73     }
  74     return isabus->irqs[isairq];
  75 }
  76
  77 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  78 {
  79     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  80     dev->isairq[dev->nirqs] = isairq;
  81     *p = isa_get_irq(dev, isairq);
  82     dev->nirqs++;
  83 }
  84
  85 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
  86 {
  87     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
  88         dev->ioport_id = ioport;
  89     }
  90 }
  91
  92 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
  93 {
  94     memory_region_add_subregion(isabus->address_space_io, start, io);
  95     isa_init_ioport(dev, start);
  96 }
  97
  98 void isa_register_portio_list(ISADevice *dev, uint16_t start,
  99                               const MemoryRegionPortio *pio_start,
 100                               void *opaque, const char *name)
 101 {
 102     PortioList *piolist = g_new(PortioList, 1);
 103
 104     /* START is how we should treat DEV, regardless of the actual
 105        contents of the portio array.  This is how the old code
 106        actually handled e.g. the FDC device.  */
 107     isa_init_ioport(dev, start);
 108
 109     portio_list_init(piolist, pio_start, opaque, name);
 110     portio_list_add(piolist, isabus->address_space_io, start);
 111 }
 112
 113 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 114 {
 115     ISADevice *dev = ISA_DEVICE(qdev);
 116     ISADeviceClass *klass = ISA_DEVICE_GET_CLASS(dev);
 117
 118     dev->isairq[0] = -1;
 119     dev->isairq[1] = -1;
 120
 121     if (klass->init) {
 122         return klass->init(dev);
 123     }
 124
 125     return 0;
 126 }
 127
 128 void isa_qdev_register_subclass(DeviceInfo *info, const char *parent)
 129 {
 130     info->init = isa_qdev_init;
 131     info->bus_info = &isa_bus_info;
 132     qdev_register_subclass(info, parent);
 133 }
 134
 135 void isa_qdev_register(DeviceInfo *info)
 136 {
 137     isa_qdev_register_subclass(info, TYPE_ISA_DEVICE);
 138 }
 139
 140 ISADevice *isa_create(ISABus *bus, const char *name)
 141 {
 142     DeviceState *dev;
 143
 144     if (!bus) {
 145         hw_error("Tried to create isa device %s with no isa bus present.",
 146                  name);
 147     }
 148     dev = qdev_create(&bus->qbus, name);
 149     return ISA_DEVICE(dev);
 150 }
 151
 152 ISADevice *isa_try_create(ISABus *bus, const char *name)
 153 {
 154     DeviceState *dev;
 155
 156     if (!bus) {
 157         hw_error("Tried to create isa device %s with no isa bus present.",
 158                  name);
 159     }
 160     dev = qdev_try_create(&bus->qbus, name);
 161     return ISA_DEVICE(dev);
 162 }
 163
 164 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 165 {
 166     ISADevice *dev;
 167
 168     dev = isa_create(bus, name);
 169     qdev_init_nofail(&dev->qdev);
 170     return dev;
 171 }
 172
 173 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 174 {
 175     ISADevice *d = ISA_DEVICE(dev);
 176
 177     if (d->isairq[1] != -1) {
 178         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 179                        d->isairq[0], d->isairq[1]);
 180     } else if (d->isairq[0] != -1) {
 181         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 182                        d->isairq[0]);
 183     }
 184 }
 185
 186 static int isabus_bridge_init(SysBusDevice *dev)
 187 {
 188     /* nothing */
 189     return 0;
 190 }
 191
 192 static void isabus_bridge_class_init(ObjectClass *klass, void *data)
 193 {
 194     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 195
 196     k->init = isabus_bridge_init;
 197 }
 198
 199 static DeviceInfo isabus_bridge_info = {
 200     .name = "isabus-bridge",
 201     .fw_name = "isa",
 202     .size = sizeof(SysBusDevice),
 203     .no_user = 1,
 204     .class_init = isabus_bridge_class_init,
 205 };
 206
 207 static TypeInfo isa_device_type_info = {
 208     .name = TYPE_ISA_DEVICE,
 209     .parent = TYPE_DEVICE,
 210     .instance_size = sizeof(ISADevice),
 211     .abstract = true,
 212     .class_size = sizeof(ISADeviceClass),
 213 };
 214
 215 static void isabus_register_devices(void)
 216 {
 217     sysbus_register_withprop(&isabus_bridge_info);
 218     type_register_static(&isa_device_type_info);
 219 }
 220
 221 static char *isabus_get_fw_dev_path(DeviceState *dev)
 222 {
 223     ISADevice *d = (ISADevice*)dev;
 224     char path[40];
 225     int off;
 226
 227     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 228     if (d->ioport_id) {
 229         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 230     }
 231
 232     return strdup(path);
 233 }
 234
 235 MemoryRegion *isa_address_space(ISADevice *dev)
 236 {
 237     return get_system_memory();
 238 }
 239
 240 device_init(isabus_register_devices)