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 struct ISABus {
  26     BusState qbus;
  27     qemu_irq *irqs;
  28 };
  29 static ISABus *isabus;
  30 target_phys_addr_t isa_mem_base = 0;
  31
  32 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  33 static char *isabus_get_fw_dev_path(DeviceState *dev);
  34
  35 static struct BusInfo isa_bus_info = {
  36     .name      = "ISA",
  37     .size      = sizeof(ISABus),
  38     .print_dev = isabus_dev_print,
  39     .get_fw_dev_path = isabus_get_fw_dev_path,
  40 };
  41
  42 ISABus *isa_bus_new(DeviceState *dev)
  43 {
  44     if (isabus) {
  45         fprintf(stderr, "Can't create a second ISA bus\n");
  46         return NULL;
  47     }
  48     if (NULL == dev) {
  49         dev = qdev_create(NULL, "isabus-bridge");
  50         qdev_init_nofail(dev);
  51     }
  52
  53     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  54     return isabus;
  55 }
  56
  57 void isa_bus_irqs(qemu_irq *irqs)
  58 {
  59     isabus->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(int isairq)
  69 {
  70     if (isairq < 0 || isairq > 15) {
  71         hw_error("isa irq %d invalid", isairq);
  72     }
  73     return isabus->irqs[isairq];
  74 }
  75
  76 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  77 {
  78     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  79     dev->isairq[dev->nirqs] = isairq;
  80     *p = isa_get_irq(isairq);
  81     dev->nirqs++;
  82 }
  83
  84 static void isa_init_ioport_one(ISADevice *dev, uint16_t ioport)
  85 {
  86     assert(dev->nioports < ARRAY_SIZE(dev->ioports));
  87     dev->ioports[dev->nioports++] = ioport;
  88 }
  89
  90 static int isa_cmp_ports(const void *p1, const void *p2)
  91 {
  92     return *(uint16_t*)p1 - *(uint16_t*)p2;
  93 }
  94
  95 void isa_init_ioport_range(ISADevice *dev, uint16_t start, uint16_t length)
  96 {
  97     int i;
  98     for (i = start; i < start + length; i++) {
  99         isa_init_ioport_one(dev, i);
 100     }
 101     qsort(dev->ioports, dev->nioports, sizeof(dev->ioports[0]), isa_cmp_ports);
 102 }
 103
 104 void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 105 {
 106     isa_init_ioport_range(dev, ioport, 1);
 107 }
 108
 109 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 110 {
 111     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 112     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 113
 114     dev->isairq[0] = -1;
 115     dev->isairq[1] = -1;
 116
 117     return info->init(dev);
 118 }
 119
 120 void isa_qdev_register(ISADeviceInfo *info)
 121 {
 122     info->qdev.init = isa_qdev_init;
 123     info->qdev.bus_info = &isa_bus_info;
 124     qdev_register(&info->qdev);
 125 }
 126
 127 ISADevice *isa_create(const char *name)
 128 {
 129     DeviceState *dev;
 130
 131     if (!isabus) {
 132         hw_error("Tried to create isa device %s with no isa bus present.",
 133                  name);
 134     }
 135     dev = qdev_create(&isabus->qbus, name);
 136     return DO_UPCAST(ISADevice, qdev, dev);
 137 }
 138
 139 ISADevice *isa_try_create(const char *name)
 140 {
 141     DeviceState *dev;
 142
 143     if (!isabus) {
 144         hw_error("Tried to create isa device %s with no isa bus present.",
 145                  name);
 146     }
 147     dev = qdev_try_create(&isabus->qbus, name);
 148     return DO_UPCAST(ISADevice, qdev, dev);
 149 }
 150
 151 ISADevice *isa_create_simple(const char *name)
 152 {
 153     ISADevice *dev;
 154
 155     dev = isa_create(name);
 156     qdev_init_nofail(&dev->qdev);
 157     return dev;
 158 }
 159
 160 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 161 {
 162     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 163
 164     if (d->isairq[1] != -1) {
 165         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 166                        d->isairq[0], d->isairq[1]);
 167     } else if (d->isairq[0] != -1) {
 168         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 169                        d->isairq[0]);
 170     }
 171 }
 172
 173 static int isabus_bridge_init(SysBusDevice *dev)
 174 {
 175     /* nothing */
 176     return 0;
 177 }
 178
 179 static SysBusDeviceInfo isabus_bridge_info = {
 180     .init = isabus_bridge_init,
 181     .qdev.name  = "isabus-bridge",
 182     .qdev.fw_name  = "isa",
 183     .qdev.size  = sizeof(SysBusDevice),
 184     .qdev.no_user = 1,
 185 };
 186
 187 static void isabus_register_devices(void)
 188 {
 189     sysbus_register_withprop(&isabus_bridge_info);
 190 }
 191
 192 static char *isabus_get_fw_dev_path(DeviceState *dev)
 193 {
 194     ISADevice *d = (ISADevice*)dev;
 195     char path[40];
 196     int off;
 197
 198     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 199     if (d->nioports) {
 200         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioports[0]);
 201     }
 202
 203     return strdup(path);
 204 }
 205
 206 MemoryRegion *isa_address_space(ISADevice *dev)
 207 {
 208     return get_system_memory();
 209 }
 210
 211 device_init(isabus_register_devices)