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(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 void isa_connect_irq(ISADevice *dev, int devnr, int isairq)
  61 {
  62     assert(devnr >= 0 && devnr < dev->nirqs);
  63     if (isabus->assigned & (1 << isairq)) {
  64         fprintf(stderr, "isa irq %d already assigned\n", isairq);
  65         exit(1);
  66     }
  67     if (dev->irqs[devnr]) {
  68         isabus->assigned |= (1 << isairq);
  69         dev->isairq[devnr] = isairq;
  70         *dev->irqs[devnr] = isabus->irqs[isairq];
  71     }
  72 }
  73
  74 /*
  75  * isa_reserve_irq() reserves the ISA irq and returns the corresponding
  76  * qemu_irq entry for the i8259.
  77  *
  78  * This function is only for special cases such as the 'ferr', and
  79  * temporary use for normal devices until they are converted to qdev.
  80  */
  81 qemu_irq isa_reserve_irq(int isairq)
  82 {
  83     if (isairq < 0 || isairq > 15) {
  84         fprintf(stderr, "isa irq %d invalid\n", isairq);
  85         exit(1);
  86     }
  87     if (isabus->assigned & (1 << isairq)) {
  88         fprintf(stderr, "isa irq %d already assigned\n", isairq);
  89         exit(1);
  90     }
  91     isabus->assigned |= (1 << isairq);
  92     return isabus->irqs[isairq];
  93 }
  94
  95 void isa_init_irq(ISADevice *dev, qemu_irq *p)
  96 {
  97     assert(dev->nirqs < ARRAY_SIZE(dev->irqs));
  98     dev->irqs[dev->nirqs] = p;
  99     dev->nirqs++;
 100 }
 101
 102 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 103 {
 104     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 105     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 106
 107     dev->isairq[0] = -1;
 108     dev->isairq[1] = -1;
 109
 110     return info->init(dev);
 111 }
 112
 113 void isa_qdev_register(ISADeviceInfo *info)
 114 {
 115     info->qdev.init = isa_qdev_init;
 116     info->qdev.bus_info = &isa_bus_info;
 117     qdev_register(&info->qdev);
 118 }
 119
 120 ISADevice *isa_create_simple(const char *name, uint32_t irq, uint32 irq2)
 121 {
 122     DeviceState *dev;
 123     ISADevice *isa;
 124
 125     if (!isabus) {
 126         fprintf(stderr, "Tried to create isa device %s with no isa bus present.\n", name);
 127         return NULL;
 128     }
 129     dev = qdev_create(&isabus->qbus, name);
 130     isa = DO_UPCAST(ISADevice, qdev, dev);
 131     qdev_init(dev);
 132     if (irq != -1) {
 133         isa_connect_irq(isa, 0, irq);
 134     }
 135     if (irq2 != -1) {
 136         isa_connect_irq(isa, 1, irq2);
 137     }
 138     return isa;
 139 }
 140
 141 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 142 {
 143     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 144
 145     if (d->isairq[1] != -1) {
 146         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 147                        d->isairq[0], d->isairq[1]);
 148     } else if (d->isairq[0] != -1) {
 149         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 150                        d->isairq[0]);
 151     }
 152 }
 153
 154 static int isabus_bridge_init(SysBusDevice *dev)
 155 {
 156     /* nothing */
 157     return 0;
 158 }
 159
 160 static SysBusDeviceInfo isabus_bridge_info = {
 161     .init = isabus_bridge_init,
 162     .qdev.name  = "isabus-bridge",
 163     .qdev.size  = sizeof(SysBusDevice),
 164 };
 165
 166 static void isabus_register_devices(void)
 167 {
 168     sysbus_register_withprop(&isabus_bridge_info);
 169 }
 170
 171 device_init(isabus_register_devices)