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 "sysemu.h"
  21 #include "monitor.h"
  22 #include "sysbus.h"
  23 #include "isa.h"
  24
  25 struct ISABus {
  26     BusState qbus;
  27     qemu_irq *irqs;
  28     uint32_t assigned;
  29 };
  30 static ISABus *isabus;
  31
  32 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  33
  34 static struct BusInfo isa_bus_info = {
  35     .name      = "ISA",
  36     .size      = sizeof(ISABus),
  37     .print_dev = isabus_dev_print,
  38     .props     = (Property[]) {
  39         DEFINE_PROP_HEX32("iobase",  ISADevice, iobase[0], -1),
  40         DEFINE_PROP_HEX32("iobase2", ISADevice, iobase[1], -1),
  41         DEFINE_PROP_END_OF_LIST(),
  42     }
  43 };
  44
  45 ISABus *isa_bus_new(DeviceState *dev)
  46 {
  47     if (isabus) {
  48         fprintf(stderr, "Can't create a second ISA bus\n");
  49         return NULL;
  50     }
  51     if (NULL == dev) {
  52         dev = qdev_create(NULL, "isabus-bridge");
  53         qdev_init(dev);
  54     }
  55
  56     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  57     return isabus;
  58 }
  59
  60 void isa_bus_irqs(qemu_irq *irqs)
  61 {
  62     isabus->irqs = irqs;
  63 }
  64
  65 void isa_connect_irq(ISADevice *dev, int devnr, int isairq)
  66 {
  67     assert(devnr >= 0 && devnr < dev->nirqs);
  68     if (isabus->assigned & (1 << isairq)) {
  69         fprintf(stderr, "isa irq %d already assigned\n", isairq);
  70         exit(1);
  71     }
  72     if (dev->irqs[devnr]) {
  73         isabus->assigned |= (1 << isairq);
  74         dev->isairq[devnr] = isairq;
  75         *dev->irqs[devnr] = isabus->irqs[isairq];
  76     }
  77 }
  78
  79 /*
  80  * isa_reserve_irq() reserves the ISA irq and returns the corresponding
  81  * qemu_irq entry for the i8259.
  82  *
  83  * This function is only for special cases such as the 'ferr', and
  84  * temporary use for normal devices until they are converted to qdev.
  85  */
  86 qemu_irq isa_reserve_irq(int isairq)
  87 {
  88     if (isairq < 0 || isairq > 15) {
  89         fprintf(stderr, "isa irq %d invalid\n", isairq);
  90         exit(1);
  91     }
  92     if (isabus->assigned & (1 << isairq)) {
  93         fprintf(stderr, "isa irq %d already assigned\n", isairq);
  94         exit(1);
  95     }
  96     isabus->assigned |= (1 << isairq);
  97     return isabus->irqs[isairq];
  98 }
  99
 100 void isa_init_irq(ISADevice *dev, qemu_irq *p)
 101 {
 102     assert(dev->nirqs < ARRAY_SIZE(dev->irqs));
 103     dev->irqs[dev->nirqs] = p;
 104     dev->nirqs++;
 105 }
 106
 107 static void isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 108 {
 109     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 110     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 111
 112     dev->isairq[0] = -1;
 113     dev->isairq[1] = -1;
 114     info->init(dev);
 115 }
 116
 117 void isa_qdev_register(ISADeviceInfo *info)
 118 {
 119     info->qdev.init = isa_qdev_init;
 120     info->qdev.bus_info = &isa_bus_info;
 121     qdev_register(&info->qdev);
 122 }
 123
 124 ISADevice *isa_create_simple(const char *name, uint32_t iobase, uint32_t iobase2,
 125                              uint32_t irq, uint32 irq2)
 126 {
 127     DeviceState *dev;
 128     ISADevice *isa;
 129
 130     if (!isabus) {
 131         fprintf(stderr, "Tried to create isa device %s with no isa bus present.\n", name);
 132         return NULL;
 133     }
 134     dev = qdev_create(&isabus->qbus, name);
 135     isa = DO_UPCAST(ISADevice, qdev, dev);
 136     isa->iobase[0] = iobase;
 137     isa->iobase[1] = iobase2;
 138     qdev_init(dev);
 139     if (-1 != irq)
 140         isa_connect_irq(isa, 0, irq);
 141     if (-1 != irq2)
 142         isa_connect_irq(isa, 1, irq2);
 143     return isa;
 144 }
 145
 146 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 147 {
 148     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 149
 150     if (d->isairq[1] != -1) {
 151         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 152                        d->isairq[0], d->isairq[1]);
 153     } else if (d->isairq[0] != -1) {
 154         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 155                        d->isairq[0]);
 156     }
 157 }
 158
 159 static void isabus_bridge_init(SysBusDevice *dev)
 160 {
 161     /* nothing */
 162 }
 163
 164 static SysBusDeviceInfo isabus_bridge_info = {
 165     .init = isabus_bridge_init,
 166     .qdev.name  = "isabus-bridge",
 167     .qdev.size  = sizeof(SysBusDevice),
 168 };
 169
 170 static void isabus_register_devices(void)
 171 {
 172     sysbus_register_withprop(&isabus_bridge_info);
 173 }
 174
 175 device_init(isabus_register_devices)