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
  24 struct ISABus {
  25     BusState qbus;
  26     qemu_irq *irqs;
  27 };
  28 static ISABus *isabus;
  29 target_phys_addr_t isa_mem_base = 0;
  30
  31 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  32 static char *isabus_get_fw_dev_path(DeviceState *dev);
  33
  34 static struct BusInfo isa_bus_info = {
  35     .name      = "ISA",
  36     .size      = sizeof(ISABus),
  37     .print_dev = isabus_dev_print,
  38     .get_fw_dev_path = isabus_get_fw_dev_path,
  39 };
  40
  41 ISABus *isa_bus_new(DeviceState *dev)
  42 {
  43     if (isabus) {
  44         fprintf(stderr, "Can't create a second ISA bus\n");
  45         return NULL;
  46     }
  47     if (NULL == dev) {
  48         dev = qdev_create(NULL, "isabus-bridge");
  49         qdev_init_nofail(dev);
  50     }
  51
  52     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  53     return isabus;
  54 }
  55
  56 void isa_bus_irqs(qemu_irq *irqs)
  57 {
  58     isabus->irqs = irqs;
  59 }
  60
  61 /*
  62  * isa_get_irq() returns the corresponding 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_get_irq(int isairq)
  68 {
  69     if (isairq < 0 || isairq > 15) {
  70         hw_error("isa irq %d invalid", isairq);
  71     }
  72     return isabus->irqs[isairq];
  73 }
  74
  75 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  76 {
  77     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  78     dev->isairq[dev->nirqs] = isairq;
  79     *p = isa_get_irq(isairq);
  80     dev->nirqs++;
  81 }
  82
  83 static void isa_init_ioport_one(ISADevice *dev, uint16_t ioport)
  84 {
  85     assert(dev->nioports < ARRAY_SIZE(dev->ioports));
  86     dev->ioports[dev->nioports++] = ioport;
  87 }
  88
  89 static int isa_cmp_ports(const void *p1, const void *p2)
  90 {
  91     return *(uint16_t*)p1 - *(uint16_t*)p2;
  92 }
  93
  94 void isa_init_ioport_range(ISADevice *dev, uint16_t start, uint16_t length)
  95 {
  96     int i;
  97     for (i = start; i < start + length; i++) {
  98         isa_init_ioport_one(dev, i);
  99     }
 100     qsort(dev->ioports, dev->nioports, sizeof(dev->ioports[0]), isa_cmp_ports);
 101 }
 102
 103 void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 104 {
 105     isa_init_ioport_range(dev, ioport, 1);
 106 }
 107
 108 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 109 {
 110     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 111     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 112
 113     dev->isairq[0] = -1;
 114     dev->isairq[1] = -1;
 115
 116     return info->init(dev);
 117 }
 118
 119 void isa_qdev_register(ISADeviceInfo *info)
 120 {
 121     info->qdev.init = isa_qdev_init;
 122     info->qdev.bus_info = &isa_bus_info;
 123     qdev_register(&info->qdev);
 124 }
 125
 126 ISADevice *isa_create(const char *name)
 127 {
 128     DeviceState *dev;
 129
 130     if (!isabus) {
 131         hw_error("Tried to create isa device %s with no isa bus present.",
 132                  name);
 133     }
 134     dev = qdev_create(&isabus->qbus, name);
 135     return DO_UPCAST(ISADevice, qdev, dev);
 136 }
 137
 138 ISADevice *isa_try_create(const char *name)
 139 {
 140     DeviceState *dev;
 141
 142     if (!isabus) {
 143         hw_error("Tried to create isa device %s with no isa bus present.",
 144                  name);
 145     }
 146     dev = qdev_try_create(&isabus->qbus, name);
 147     return DO_UPCAST(ISADevice, qdev, dev);
 148 }
 149
 150 ISADevice *isa_create_simple(const char *name)
 151 {
 152     ISADevice *dev;
 153
 154     dev = isa_create(name);
 155     qdev_init_nofail(&dev->qdev);
 156     return dev;
 157 }
 158
 159 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 160 {
 161     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 162
 163     if (d->isairq[1] != -1) {
 164         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 165                        d->isairq[0], d->isairq[1]);
 166     } else if (d->isairq[0] != -1) {
 167         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 168                        d->isairq[0]);
 169     }
 170 }
 171
 172 static int isabus_bridge_init(SysBusDevice *dev)
 173 {
 174     /* nothing */
 175     return 0;
 176 }
 177
 178 static SysBusDeviceInfo isabus_bridge_info = {
 179     .init = isabus_bridge_init,
 180     .qdev.name  = "isabus-bridge",
 181     .qdev.fw_name  = "isa",
 182     .qdev.size  = sizeof(SysBusDevice),
 183     .qdev.no_user = 1,
 184 };
 185
 186 static void isabus_register_devices(void)
 187 {
 188     sysbus_register_withprop(&isabus_bridge_info);
 189 }
 190
 191 static char *isabus_get_fw_dev_path(DeviceState *dev)
 192 {
 193     ISADevice *d = (ISADevice*)dev;
 194     char path[40];
 195     int off;
 196
 197     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 198     if (d->nioports) {
 199         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioports[0]);
 200     }
 201
 202     return strdup(path);
 203 }
 204
 205 device_init(isabus_register_devices)