hw/sysbus.c

   1 /*
   2  *  System (CPU) Bus device support code
   3  *
   4  *  Copyright (c) 2009 CodeSourcery
   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
  20 #include "sysbus.h"
  21 #include "monitor.h"
  22 #include "exec-memory.h"
  23
  24 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  25 static char *sysbus_get_fw_dev_path(DeviceState *dev);
  26
  27 static void system_bus_class_init(ObjectClass *klass, void *data)
  28 {
  29     BusClass *k = BUS_CLASS(klass);
  30
  31     k->print_dev = sysbus_dev_print;
  32     k->get_fw_dev_path = sysbus_get_fw_dev_path;
  33 }
  34
  35 static const TypeInfo system_bus_info = {
  36     .name = TYPE_SYSTEM_BUS,
  37     .parent = TYPE_BUS,
  38     .instance_size = sizeof(BusState),
  39     .class_init = system_bus_class_init,
  40 };
  41
  42 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
  43 {
  44     assert(n >= 0 && n < dev->num_irq);
  45     dev->irqs[n] = NULL;
  46     if (dev->irqp[n]) {
  47         *dev->irqp[n] = irq;
  48     }
  49 }
  50
  51 void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
  52 {
  53     assert(n >= 0 && n < dev->num_mmio);
  54
  55     if (dev->mmio[n].addr == addr) {
  56         /* ??? region already mapped here.  */
  57         return;
  58     }
  59     if (dev->mmio[n].addr != (hwaddr)-1) {
  60         /* Unregister previous mapping.  */
  61         memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
  62     }
  63     dev->mmio[n].addr = addr;
  64     memory_region_add_subregion(get_system_memory(),
  65                                 addr,
  66                                 dev->mmio[n].memory);
  67 }
  68
  69
  70 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
  71 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
  72 {
  73     int n;
  74
  75     assert(dev->num_irq < QDEV_MAX_IRQ);
  76     n = dev->num_irq++;
  77     dev->irqp[n] = p;
  78 }
  79
  80 /* Pass IRQs from a target device.  */
  81 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
  82 {
  83     int i;
  84     assert(dev->num_irq == 0);
  85     dev->num_irq = target->num_irq;
  86     for (i = 0; i < dev->num_irq; i++) {
  87         dev->irqp[i] = target->irqp[i];
  88     }
  89 }
  90
  91 void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
  92 {
  93     int n;
  94
  95     assert(dev->num_mmio < QDEV_MAX_MMIO);
  96     n = dev->num_mmio++;
  97     dev->mmio[n].addr = -1;
  98     dev->mmio[n].memory = memory;
  99 }
 100
 101 MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
 102 {
 103     return dev->mmio[n].memory;
 104 }
 105
 106 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 107 {
 108     pio_addr_t i;
 109
 110     for (i = 0; i < size; i++) {
 111         assert(dev->num_pio < QDEV_MAX_PIO);
 112         dev->pio[dev->num_pio++] = ioport++;
 113     }
 114 }
 115
 116 static int sysbus_device_init(DeviceState *dev)
 117 {
 118     SysBusDevice *sd = SYS_BUS_DEVICE(dev);
 119     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);
 120
 121     return sbc->init(sd);
 122 }
 123
 124 DeviceState *sysbus_create_varargs(const char *name,
 125                                    hwaddr addr, ...)
 126 {
 127     DeviceState *dev;
 128     SysBusDevice *s;
 129     va_list va;
 130     qemu_irq irq;
 131     int n;
 132
 133     dev = qdev_create(NULL, name);
 134     s = sysbus_from_qdev(dev);
 135     qdev_init_nofail(dev);
 136     if (addr != (hwaddr)-1) {
 137         sysbus_mmio_map(s, 0, addr);
 138     }
 139     va_start(va, addr);
 140     n = 0;
 141     while (1) {
 142         irq = va_arg(va, qemu_irq);
 143         if (!irq) {
 144             break;
 145         }
 146         sysbus_connect_irq(s, n, irq);
 147         n++;
 148     }
 149     va_end(va);
 150     return dev;
 151 }
 152
 153 DeviceState *sysbus_try_create_varargs(const char *name,
 154                                        hwaddr addr, ...)
 155 {
 156     DeviceState *dev;
 157     SysBusDevice *s;
 158     va_list va;
 159     qemu_irq irq;
 160     int n;
 161
 162     dev = qdev_try_create(NULL, name);
 163     if (!dev) {
 164         return NULL;
 165     }
 166     s = sysbus_from_qdev(dev);
 167     qdev_init_nofail(dev);
 168     if (addr != (hwaddr)-1) {
 169         sysbus_mmio_map(s, 0, addr);
 170     }
 171     va_start(va, addr);
 172     n = 0;
 173     while (1) {
 174         irq = va_arg(va, qemu_irq);
 175         if (!irq) {
 176             break;
 177         }
 178         sysbus_connect_irq(s, n, irq);
 179         n++;
 180     }
 181     va_end(va);
 182     return dev;
 183 }
 184
 185 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 186 {
 187     SysBusDevice *s = sysbus_from_qdev(dev);
 188     hwaddr size;
 189     int i;
 190
 191     monitor_printf(mon, "%*sirq %d\n", indent, "", s->num_irq);
 192     for (i = 0; i < s->num_mmio; i++) {
 193         size = memory_region_size(s->mmio[i].memory);
 194         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 195                        indent, "", s->mmio[i].addr, size);
 196     }
 197 }
 198
 199 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 200 {
 201     SysBusDevice *s = sysbus_from_qdev(dev);
 202     char path[40];
 203     int off;
 204
 205     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 206
 207     if (s->num_mmio) {
 208         snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,
 209                  s->mmio[0].addr);
 210     } else if (s->num_pio) {
 211         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
 212     }
 213
 214     return g_strdup(path);
 215 }
 216
 217 void sysbus_add_memory(SysBusDevice *dev, hwaddr addr,
 218                        MemoryRegion *mem)
 219 {
 220     memory_region_add_subregion(get_system_memory(), addr, mem);
 221 }
 222
 223 void sysbus_add_memory_overlap(SysBusDevice *dev, hwaddr addr,
 224                                MemoryRegion *mem, unsigned priority)
 225 {
 226     memory_region_add_subregion_overlap(get_system_memory(), addr, mem,
 227                                         priority);
 228 }
 229
 230 void sysbus_del_memory(SysBusDevice *dev, MemoryRegion *mem)
 231 {
 232     memory_region_del_subregion(get_system_memory(), mem);
 233 }
 234
 235 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 236                        MemoryRegion *mem)
 237 {
 238     memory_region_add_subregion(get_system_io(), addr, mem);
 239 }
 240
 241 void sysbus_del_io(SysBusDevice *dev, MemoryRegion *mem)
 242 {
 243     memory_region_del_subregion(get_system_io(), mem);
 244 }
 245
 246 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 247 {
 248     return get_system_memory();
 249 }
 250
 251 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 252 {
 253     DeviceClass *k = DEVICE_CLASS(klass);
 254     k->init = sysbus_device_init;
 255     k->bus_type = TYPE_SYSTEM_BUS;
 256 }
 257
 258 static TypeInfo sysbus_device_type_info = {
 259     .name = TYPE_SYS_BUS_DEVICE,
 260     .parent = TYPE_DEVICE,
 261     .instance_size = sizeof(SysBusDevice),
 262     .abstract = true,
 263     .class_size = sizeof(SysBusDeviceClass),
 264     .class_init = sysbus_device_class_init,
 265 };
 266
 267 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 268 static BusState *main_system_bus;
 269
 270 static void main_system_bus_create(void)
 271 {
 272     /* assign main_system_bus before qbus_create_inplace()
 273      * in order to make "if (bus != sysbus_get_default())" work */
 274     main_system_bus = g_malloc0(system_bus_info.instance_size);
 275     qbus_create_inplace(main_system_bus, TYPE_SYSTEM_BUS, NULL,
 276                         "main-system-bus");
 277     OBJECT(main_system_bus)->free = g_free;
 278     object_property_add_child(container_get(qdev_get_machine(),
 279                                             "/unattached"),
 280                               "sysbus", OBJECT(main_system_bus), NULL);
 281 }
 282
 283 BusState *sysbus_get_default(void)
 284 {
 285     if (!main_system_bus) {
 286         main_system_bus_create();
 287     }
 288     return main_system_bus;
 289 }
 290
 291 static void sysbus_register_types(void)
 292 {
 293     type_register_static(&system_bus_info);
 294     type_register_static(&sysbus_device_type_info);
 295 }
 296
 297 type_init(sysbus_register_types)