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 inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
  87 {
  88     if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
  89         dev->ioport_id = ioport;
  90     }
  91 }
  92
  93 void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start)
  94 {
  95     memory_region_add_subregion(isabus->address_space_io, start, io);
  96     isa_init_ioport(dev, start);
  97 }
  98
  99 void isa_register_portio_list(ISADevice *dev, uint16_t start,
 100                               const MemoryRegionPortio *pio_start,
 101                               void *opaque, const char *name)
 102 {
 103     PortioList *piolist = g_new(PortioList, 1);
 104
 105     /* START is how we should treat DEV, regardless of the actual
 106        contents of the portio array.  This is how the old code
 107        actually handled e.g. the FDC device.  */
 108     isa_init_ioport(dev, start);
 109
 110     portio_list_init(piolist, pio_start, opaque, name);
 111     portio_list_add(piolist, isabus->address_space_io, start);
 112 }
 113
 114 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 115 {
 116     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 117     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 118
 119     dev->isairq[0] = -1;
 120     dev->isairq[1] = -1;
 121
 122     return info->init(dev);
 123 }
 124
 125 void isa_qdev_register(ISADeviceInfo *info)
 126 {
 127     info->qdev.init = isa_qdev_init;
 128     info->qdev.bus_info = &isa_bus_info;
 129     qdev_register(&info->qdev);
 130 }
 131
 132 ISADevice *isa_create(const char *name)
 133 {
 134     DeviceState *dev;
 135
 136     if (!isabus) {
 137         hw_error("Tried to create isa device %s with no isa bus present.",
 138                  name);
 139     }
 140     dev = qdev_create(&isabus->qbus, name);
 141     return DO_UPCAST(ISADevice, qdev, dev);
 142 }
 143
 144 ISADevice *isa_try_create(const char *name)
 145 {
 146     DeviceState *dev;
 147
 148     if (!isabus) {
 149         hw_error("Tried to create isa device %s with no isa bus present.",
 150                  name);
 151     }
 152     dev = qdev_try_create(&isabus->qbus, name);
 153     return DO_UPCAST(ISADevice, qdev, dev);
 154 }
 155
 156 ISADevice *isa_create_simple(const char *name)
 157 {
 158     ISADevice *dev;
 159
 160     dev = isa_create(name);
 161     qdev_init_nofail(&dev->qdev);
 162     return dev;
 163 }
 164
 165 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 166 {
 167     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 168
 169     if (d->isairq[1] != -1) {
 170         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 171                        d->isairq[0], d->isairq[1]);
 172     } else if (d->isairq[0] != -1) {
 173         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 174                        d->isairq[0]);
 175     }
 176 }
 177
 178 static int isabus_bridge_init(SysBusDevice *dev)
 179 {
 180     /* nothing */
 181     return 0;
 182 }
 183
 184 static SysBusDeviceInfo isabus_bridge_info = {
 185     .init = isabus_bridge_init,
 186     .qdev.name  = "isabus-bridge",
 187     .qdev.fw_name  = "isa",
 188     .qdev.size  = sizeof(SysBusDevice),
 189     .qdev.no_user = 1,
 190 };
 191
 192 static void isabus_register_devices(void)
 193 {
 194     sysbus_register_withprop(&isabus_bridge_info);
 195 }
 196
 197 static char *isabus_get_fw_dev_path(DeviceState *dev)
 198 {
 199     ISADevice *d = (ISADevice*)dev;
 200     char path[40];
 201     int off;
 202
 203     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 204     if (d->ioport_id) {
 205         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
 206     }
 207
 208     return strdup(path);
 209 }
 210
 211 MemoryRegion *isa_address_space(ISADevice *dev)
 212 {
 213     return get_system_memory();
 214 }
 215
 216 device_init(isabus_register_devices)