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 static ISABus *isabus;
  26 target_phys_addr_t isa_mem_base = 0;
  27
  28 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  29 static char *isabus_get_fw_dev_path(DeviceState *dev);
  30
  31 static struct BusInfo isa_bus_info = {
  32     .name      = "ISA",
  33     .size      = sizeof(ISABus),
  34     .print_dev = isabus_dev_print,
  35     .get_fw_dev_path = isabus_get_fw_dev_path,
  36 };
  37
  38 ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space_io)
  39 {
  40     if (isabus) {
  41         fprintf(stderr, "Can't create a second ISA bus\n");
  42         return NULL;
  43     }
  44     if (NULL == dev) {
  45         dev = qdev_create(NULL, "isabus-bridge");
  46         qdev_init_nofail(dev);
  47     }
  48
  49     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  50     isabus->address_space_io = address_space_io;
  51     return isabus;
  52 }
  53
  54 void isa_bus_irqs(ISABus *bus, qemu_irq *irqs)
  55 {
  56     assert(!bus || bus == isabus);
  57     isabus->irqs = irqs;
  58 }
  59
  60 /*
  61  * isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
  62  *
  63  * This function is only for special cases such as the 'ferr', and
  64  * temporary use for normal devices until they are converted to qdev.
  65  */
  66 qemu_irq isa_get_irq(ISADevice *dev, int isairq)
  67 {
  68     assert(!dev || DO_UPCAST(ISABus, qbus, dev->qdev.parent_bus) == isabus);
  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(dev, isairq);
  80     dev->nirqs++;
  81 }
  82
  83 static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
  84 {
  85     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
  86         dev->ioport_id = ioport;
  87     }
  88 }
  89
  90 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
  91 {
  92     memory_region_add_subregion(isabus->address_space_io, start, io);
  93     isa_init_ioport(dev, start);
  94 }
  95
  96 void isa_register_portio_list(ISADevice *dev, uint16_t start,
  97                               const MemoryRegionPortio *pio_start,
  98                               void *opaque, const char *name)
  99 {
 100     PortioList *piolist = g_new(PortioList, 1);
 101
 102     /* START is how we should treat DEV, regardless of the actual
 103        contents of the portio array.  This is how the old code
 104        actually handled e.g. the FDC device.  */
 105     isa_init_ioport(dev, start);
 106
 107     portio_list_init(piolist, pio_start, opaque, name);
 108     portio_list_add(piolist, isabus->address_space_io, start);
 109 }
 110
 111 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 112 {
 113     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 114     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 115
 116     dev->isairq[0] = -1;
 117     dev->isairq[1] = -1;
 118
 119     return info->init(dev);
 120 }
 121
 122 void isa_qdev_register(ISADeviceInfo *info)
 123 {
 124     info->qdev.init = isa_qdev_init;
 125     info->qdev.bus_info = &isa_bus_info;
 126     qdev_register(&info->qdev);
 127 }
 128
 129 ISADevice *isa_create(ISABus *bus, const char *name)
 130 {
 131     DeviceState *dev;
 132
 133     if (!bus) {
 134         hw_error("Tried to create isa device %s with no isa bus present.",
 135                  name);
 136     }
 137     dev = qdev_create(&bus->qbus, name);
 138     return DO_UPCAST(ISADevice, qdev, dev);
 139 }
 140
 141 ISADevice *isa_try_create(ISABus *bus, const char *name)
 142 {
 143     DeviceState *dev;
 144
 145     if (!bus) {
 146         hw_error("Tried to create isa device %s with no isa bus present.",
 147                  name);
 148     }
 149     dev = qdev_try_create(&bus->qbus, name);
 150     return DO_UPCAST(ISADevice, qdev, dev);
 151 }
 152
 153 ISADevice *isa_create_simple(ISABus *bus, const char *name)
 154 {
 155     ISADevice *dev;
 156
 157     dev = isa_create(bus, name);
 158     qdev_init_nofail(&dev->qdev);
 159     return dev;
 160 }
 161
 162 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 163 {
 164     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 165
 166     if (d->isairq[1] != -1) {
 167         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 168                        d->isairq[0], d->isairq[1]);
 169     } else if (d->isairq[0] != -1) {
 170         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 171                        d->isairq[0]);
 172     }
 173 }
 174
 175 static int isabus_bridge_init(SysBusDevice *dev)
 176 {
 177     /* nothing */
 178     return 0;
 179 }
 180
 181 static SysBusDeviceInfo isabus_bridge_info = {
 182     .init = isabus_bridge_init,
 183     .qdev.name  = "isabus-bridge",
 184     .qdev.fw_name  = "isa",
 185     .qdev.size  = sizeof(SysBusDevice),
 186     .qdev.no_user = 1,
 187 };
 188
 189 static void isabus_register_devices(void)
 190 {
 191     sysbus_register_withprop(&isabus_bridge_info);
 192 }
 193
 194 static char *isabus_get_fw_dev_path(DeviceState *dev)
 195 {
 196     ISADevice *d = (ISADevice*)dev;
 197     char path[40];
 198     int off;
 199
 200     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 201     if (d->ioport_id) {
 202         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 203     }
 204
 205     return strdup(path);
 206 }
 207
 208 MemoryRegion *isa_address_space(ISADevice *dev)
 209 {
 210     return get_system_memory();
 211 }
 212
 213 device_init(isabus_register_devices)