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