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     MemoryRegion *address_space_io;
  28     qemu_irq *irqs;
  29 };
  30 static ISABus *isabus;
  31 target_phys_addr_t isa_mem_base = 0;
  32
  33 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  34 static char *isabus_get_fw_dev_path(DeviceState *dev);
  35
  36 static struct BusInfo isa_bus_info = {
  37     .name      = "ISA",
  38     .size      = sizeof(ISABus),
  39     .print_dev = isabus_dev_print,
  40     .get_fw_dev_path = isabus_get_fw_dev_path,
  41 };
  42
  43 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space_io)
  44 {
  45     if (isabus) {
  46         fprintf(stderr, "Can't create a second ISA bus\n");
  47         return NULL;
  48     }
  49     if (NULL == dev) {
  50         dev = qdev_create(NULL, "isabus-bridge");
  51         qdev_init_nofail(dev);
  52     }
  53
  54     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  55     isabus->address_space_io = address_space_io;
  56     return isabus;
  57 }
  58
  59 void isa_bus_irqs(qemu_irq *irqs)
  60 {
  61     isabus->irqs = irqs;
  62 }
  63
  64 /*
  65  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  66  *
  67  * This function is only for special cases such as the 'ferr', and
  68  * temporary use for normal devices until they are converted to qdev.
  69  */
  70 qemu_irq isa_get_irq(int isairq)
  71 {
  72     if (isairq < 0 || isairq > 15) {
  73         hw_error("isa irq %d invalid", isairq);
  74     }
  75     return isabus->irqs[isairq];
  76 }
  77
  78 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  79 {
  80     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  81     dev->isairq[dev->nirqs] = isairq;
  82     *p = isa_get_irq(isairq);
  83     dev->nirqs++;
  84 }
  85
  86 static void isa_init_ioport_one(ISADevice *dev, uint16_t ioport)
  87 {
  88     assert(dev->nioports < ARRAY_SIZE(dev->ioports));
  89     dev->ioports[dev->nioports++] = ioport;
  90 }
  91
  92 static int isa_cmp_ports(const void *p1, const void *p2)
  93 {
  94     return *(uint16_t*)p1 - *(uint16_t*)p2;
  95 }
  96
  97 void isa_init_ioport_range(ISADevice *dev, uint16_t start, uint16_t length)
  98 {
  99     int i;
 100     for (i = start; i < start + length; i++) {
 101         isa_init_ioport_one(dev, i);
 102     }
 103     qsort(dev->ioports, dev->nioports, sizeof(dev->ioports[0]), isa_cmp_ports);
 104 }
 105
 106 void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 107 {
 108     isa_init_ioport_range(dev, ioport, 1);
 109 }
 110
 111 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
 112 {
 113     memory_region_add_subregion(isabus->address_space_io, start, io);
 114     if (dev != NULL) {
 115         assert(dev->nio < ARRAY_SIZE(dev->io));
 116         dev->io[dev->nio++] = io;
 117         isa_init_ioport_range(dev, start, memory_region_size(io));
 118     }
 119 }
 120
 121 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 122 {
 123     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 124     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 125
 126     dev->isairq[0] = -1;
 127     dev->isairq[1] = -1;
 128
 129     return info->init(dev);
 130 }
 131
 132 void isa_qdev_register(ISADeviceInfo *info)
 133 {
 134     info->qdev.init = isa_qdev_init;
 135     info->qdev.bus_info = &isa_bus_info;
 136     qdev_register(&info->qdev);
 137 }
 138
 139 ISADevice *isa_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_create(&isabus->qbus, name);
 148     return DO_UPCAST(ISADevice, qdev, dev);
 149 }
 150
 151 ISADevice *isa_try_create(const char *name)
 152 {
 153     DeviceState *dev;
 154
 155     if (!isabus) {
 156         hw_error("Tried to create isa device %s with no isa bus present.",
 157                  name);
 158     }
 159     dev = qdev_try_create(&isabus->qbus, name);
 160     return DO_UPCAST(ISADevice, qdev, dev);
 161 }
 162
 163 ISADevice *isa_create_simple(const char *name)
 164 {
 165     ISADevice *dev;
 166
 167     dev = isa_create(name);
 168     qdev_init_nofail(&dev->qdev);
 169     return dev;
 170 }
 171
 172 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 173 {
 174     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 175
 176     if (d->isairq[1] != -1) {
 177         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 178                        d->isairq[0], d->isairq[1]);
 179     } else if (d->isairq[0] != -1) {
 180         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 181                        d->isairq[0]);
 182     }
 183 }
 184
 185 static int isabus_bridge_init(SysBusDevice *dev)
 186 {
 187     /* nothing */
 188     return 0;
 189 }
 190
 191 static SysBusDeviceInfo isabus_bridge_info = {
 192     .init = isabus_bridge_init,
 193     .qdev.name  = "isabus-bridge",
 194     .qdev.fw_name  = "isa",
 195     .qdev.size  = sizeof(SysBusDevice),
 196     .qdev.no_user = 1,
 197 };
 198
 199 static void isabus_register_devices(void)
 200 {
 201     sysbus_register_withprop(&isabus_bridge_info);
 202 }
 203
 204 static char *isabus_get_fw_dev_path(DeviceState *dev)
 205 {
 206     ISADevice *d = (ISADevice*)dev;
 207     char path[40];
 208     int off;
 209
 210     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 211     if (d->nioports) {
 212         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioports[0]);
 213     }
 214
 215     return strdup(path);
 216 }
 217
 218 MemoryRegion *isa_address_space(ISADevice *dev)
 219 {
 220     return get_system_memory();
 221 }
 222
 223 device_init(isabus_register_devices)